EP0609483B1 - Method and apparatus for coating a paper web - Google Patents

Method and apparatus for coating a paper web Download PDF

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Publication number
EP0609483B1
EP0609483B1 EP93112694A EP93112694A EP0609483B1 EP 0609483 B1 EP0609483 B1 EP 0609483B1 EP 93112694 A EP93112694 A EP 93112694A EP 93112694 A EP93112694 A EP 93112694A EP 0609483 B1 EP0609483 B1 EP 0609483B1
Authority
EP
European Patent Office
Prior art keywords
coating
paper web
station
roller
web
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93112694A
Other languages
German (de)
French (fr)
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EP0609483A1 (en
Inventor
Rudolf Dipl.-Ing. Beisswanger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19934302435 external-priority patent/DE4302435A1/en
Priority claimed from DE19934302437 external-priority patent/DE4302437A1/en
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to EP97100214A priority Critical patent/EP0784120A3/en
Publication of EP0609483A1 publication Critical patent/EP0609483A1/en
Application granted granted Critical
Publication of EP0609483B1 publication Critical patent/EP0609483B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14—Secondary fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod

Definitions

  • the invention relates to a method and an apparatus for coating a paper web. Reference is made to the generic terms of the method claim and the device claim.
  • the invention is based on document (8), in particular on its figure 1. From document (8), a method has become known in which an emulsion layer and a clay layer are transferred to the paper web as thin, moist films in a single pass, and the Clay layer is provided with a visible rotation print after drying.
  • a device in which two application rollers are provided which form a nip with one another through which a paper web runs.
  • a nozzle applicator is assigned to each of the application rollers, each of which applies a coating color film onto the Applying the outer surface of the roller in question.
  • the nozzle applicator has a nozzle with two nozzle lips, one of which carries a doctor blade at its free end. This is a rod with a grooved outer surface.
  • a metered application of coating color on the outer surface of the roller in question is thus possible. Accordingly, this is an indirect application method, since the line is first applied to the outer surface of the roller and is transferred from there to the paper web.
  • Document (9) discloses a method in which a paper with a rough surface is colored at a rate by a magnetic roll system and a flexographic printing system.
  • Waste paper has been used in the manufacture of paper and cardboard for many years, in particular with hygienic paper and newsprint. In contrast, the use of waste paper has so far been low for writing and printing paper.
  • waste paper is very desirable, since waste paper is an abundant pulp that is relatively cheap.
  • the waste paper brings with it technical problems.
  • the strength of papers with a high waste paper input is relatively low, on the other hand, waste paper naturally contains contaminants in the form of dust, which is particularly problematic in offset printing machines.
  • the low strength of scrap base paper containing waste paper makes itself unpleasantly noticeable in the coating process.
  • the coating color contains a high proportion of water in the order of 50% of the total coating color. When brushing, a substantial part of this water penetrates into the paper, whereby its strength naturally drops dramatically. This increases the risk of tearing accordingly.
  • the invention is based on the object of specifying a method and a device in order to be able to coat a paper web of low strength, in particular based on waste paper, with high coating color application weights without the risk of tearing.
  • Figure 1 shows the basic structure of a paper machine with a coating device.
  • 1 shows an end region of a drying section 1 with a multiplicity of drying cylinders, around which a paper web 2 is guided in a meandering manner.
  • the dryer section has two rows, ie it has a plurality of upper and lower dryer cylinders, each of which is arranged in two horizontal rows. When circulating around the individual drying cylinders, the paper web is sandwiched between the outer surface of the drying cylinder in question and a dryer fabric.
  • the system shown is followed by a smoothing unit, which is designed as a so-called soft nip calendar.
  • the paper web is deflected vertically downwards on a deflection roller 4.
  • the coating station 5 comprises only two rollers 5.1 and 5.2. These are arranged parallel to one another and together form a nip through which the paper web 2 is passed. The two rollers are arranged such that the roller 5.2 is perpendicular to the roller 5.1.
  • the roller 5.1 is assigned a nozzle applicator 5.3 - see DE-U-8 414 413. This nozzle applicator 5.3 has two machine-wide nozzle lips, not shown here.
  • the second nozzle lip seen in the direction of rotation of roller 5.1 carries a roller doctor with a grooved outer surface.
  • This roller doctor metered the amount of coating color exactly onto the outer surface of the roller 5.1. Exactly this amount of coating color is transferred to the incoming paper web 2 in the nip, and naturally only on one side thereof.
  • a scraper 5.4 is assigned to the roller 5.2.
  • the paper web 2 thus coated on one side passes through the nip, passes around deflecting rollers 4.5, 4.6, 4.7 and 4.8, whereby it passes through a drying station 6.
  • a mini drying section 7 then follows, again with drying cylinders.
  • a second coating station 8 follows. This in turn has two rollers 8.1 and 8.2.
  • the roller 8.1 is in turn assigned a nozzle applicator 8.3, which is constructed analogously to the nozzle applicator 5.3.
  • the other side of the paper web is hereby provided with a line.
  • Another mini dryer group 9 and a rolling device 10 follow.
  • one side of the paper web is completely coated in the first coating station 5 and then the other side of the paper web in the second coating station 8.
  • the coating color application weight that is also the final coating color application weight of the page in question is thus applied in the coating station in question.
  • the second coating station is located at a point at which the paper web has sufficient strength due to the previous drying to survive a new coating process with the corresponding water penetration without tearing.
  • Coating base papers with a relatively high amount of waste paper and a relatively low initial strength can be coated with coating quantities of up to 8 g / m 2 with this device.
  • the individual coating stations are those in which the paper web is provided with an indirect application by transferring the line from the outer surface of the roller to the paper web. It is very important that no doctor element has to be attached to the paper web, because the line has already reached its final thickness and dosage on the outer surface of the roller.
  • the selected coating station with its indirect application process ensures that the coated side of the paper web is completely sealed with coating color, so that dust and other particles which adhere to the surface of paper based on waste paper are enveloped in a perfect manner.
  • FIGS. 1a, 1b and 1c show details and different embodiments of the system according to FIG. 1.
  • a grater element 20.1, 20.2, 20.3 is provided.
  • This can be a round rod of larger or smaller diameter (Fig. 1a or Fig. 1b), or a rod-shaped body with a non-circular cross-section (Fig. 1c).
  • the grating element can oscillate in its own longitudinal direction or rotate around its own axis in the direction of travel of the paper web or in the case of round distribution elements. Rotating oscillation is also possible.
  • the surface can be very different, for example completely smooth, polished, grooved, made from all-round wires.
  • FIG. 2 The system shown in FIG. 2 is constructed similarly to the system according to FIG. 1.
  • the end of a two-row cylinder dryer section 1 can also be seen here, furthermore a smoothing unit 3, a first coating station 5, one of these downstream driers 6, a dryer section 7 with drying cylinders, a second coating station 8, a further dryer 9, a dryer section 9.1 with drying cylinders and a reeling station 10.
  • the two coating stations 5 and 8 each have two nozzle applicators 5.1, 5.2 or 8.1 and 8.2. This means that the paper web 2 is coated on both sides in each coating station.
  • the dryers 6 and 9 are air dryers which carry the web freely and bring them to such a dry content (if possible at least 70% dry) until the line in the subsequent cylinder dryer sections 7 and 9.1 is touchable.
  • FIG. 2a shows a modified embodiment of FIG. 2.
  • an infrared dryer 30 is provided, followed by a floating dryer (air dryer) 6.9.
  • coating station 5 has only a single application station 5.1, which is assigned to one of the two rollers of coating station 5.
  • the coating station 5 is followed by a grater 20.5.
  • Coating station 8 also has only one Order station 8.1 on.
  • a distribution element 20.6 is connected downstream. The application is therefore only one-sided at each coating station 5 or 8.
  • first only one side of the paper web can be coated and then dried, and then the other side of the paper web can be coated and dried. It is always crucial, however, that only a subset of the total coat is applied.
  • drying devices must be provided after each coating process.
  • the choice of the drying process and the corresponding drying device is left to the expert.
  • he can use infrared dryers, air-guided dryers or cylinder dryers.
  • the dryers 6 and 9 are equipped with such a high drying capacity that no further drying units are required between the coating station and the cylinder drying device.
  • FIGS 4-6 and 7-9 show schematically conceivable configurations using the invention. All of these configurations are two Coating stations together. For better clarity, only the essential components of the individual configurations are described in more detail.
  • the paper web is fed in the direction of the arrow from below to a first coating station 1, then to a second coating station 2, a first infrared path 3, a second infrared path 4, a suspension rail dryer 5 and finally a dryer section 6.
  • the first serves Coating station 1 for gluing or pigmenting or priming. This is an indirect coating process since a nozzle applicator 1.1 first applies the line to an applicator roller 1.2, which then delivers the line to the paper web.
  • coating color is first applied directly to the paper web in a first nozzle applicator 2.1, followed by a second nozzle applicator for a particularly short residence time (so-called SDTA principle) with an integrated doctor bar.
  • the construction is designed such that both the first nozzle applicator 2.1 and the second nozzle applicator 2.2 can be pivoted with doctor bars 2.3 if necessary, so that nothing is applied to coating station 2 at all.
  • An infrared drying unit 6 and a hot air drying unit 7 are interposed between the first coating station 1 and the second coating station 2.
  • the nozzle applicator 2.1 can be a so-called SDTA, for example as shown in VOITH special print p 2865 11/92 in Fig. 18 and 21.
  • This application unit can have a rod-shaped doctor blade with a smooth or profiled outer surface, but also a blade.
  • a so-called "stiff blade” or a "bent blade” can be considered.
  • Application unit 2.1 can also be a nozzle application unit without a doctor element, for applying the coating color in the free jet as a "curtain” on the paper web (so-called “fountain coating”).
  • a nozzle application unit without a doctor element for applying the coating color in the free jet as a "curtain” on the paper web (so-called “fountain coating”).
  • guide rollers can be provided before and after coating station 1 for the purpose of precise adjustment of the wrap angle.
  • a roller applicator can be provided instead of the nozzle applicator 2.1.
  • a so-called grinding application can be provided on roller 1.2, with a difference in speed between the web speed and the peripheral speed of roller 1.2.
  • the differential speed can be 0.1 times the web speed, in both directions.
  • the angle of wrap of the roller 1.2 through the web will generally be between 5 and 25 °.
  • Coating station 1 has a second nozzle applicator, namely the nozzle applicator 1.3, which is assigned to a roller 1.4. Also on the Drying devices 6 and 7 opposite side an infrared drying device 8 is provided.
  • FIG. 6 corresponds essentially to that of FIG. 4. However, an infrared drying device and a hot air drying device 6.1, 6.2 and 7.1, 7.2 are interposed between the two coating stations 1 and 2 on both sides of the paper web.
  • Coating station 1 again has an applicator unit 1.1 with an applicator roller 1.2.
  • Coating station 2 is assigned a first nozzle applicator 2.1 and a second nozzle applicator 2.2 with an integrated doctor bar 2.3. This is followed by a suspension railway dryer 5 and finally a dryer group 6.
  • An infrared drying device 6 and a hot air drying device 7 are interposed on one side of the paper web between the two coating stations 1 and 2.
  • the various infrared drying devices or air drying devices serve for intermediate drying of the line applied with the coating station 1.
  • coating station 1 contains, as mentioned, two nozzle applicators 1.1 and 1.3. It is particularly expedient here to immediately connect infrared drying and air drying. With this application concept, it is possible to simultaneously treat both sides of the paper with a glue or pigment suspension in coating station 1, and to dry out to such an extent that the coating in coating station 2 can be touched by the counter roller.
  • the top coat for the paper underside can then be applied either with the first nozzle applicator 2.1 or with the downstream SDTA nozzle applicator 2.2.
  • the leveling is carried out using a blade or a stick.
  • Appendix 6 two construction principles are combined in such a way that their advantages combine, but the disadvantages do not appear. The details are as follows:
  • coating station 2 with nozzle applicator and coating blade or a rod as a leveling element leaves no squeegee marks and is excellently suited for eliminating the so-called film splitting phenomenon.
  • raw paper-containing raw paper is pretreated with the nozzle applicator, while the second coating station with its nozzle applicator and a coating blade ensures the desired coating quality in terms of smoothness, opacity and surface consistency.
  • the solution to this sub-task is that the application devices are arranged immediately after the nip in the free train of the paper web distribution elements.
  • these rubbing elements cause the coating slip to be rubbed in the still flowable state in such a way that a self-contained and largely uniformly coated paper web surface is achieved.
  • this is achieved by a rotating movement of the distribution element and / or its oscillating movement about the longitudinal axis and / or its oscillating movements transversely or longitudinally to the paper web.
  • a two-roll press is shown in FIG.
  • the two rollers are driven in opposite directions to one another.
  • the two-roll press shown comprises two application devices.
  • An application unit 5, 6 for a flowable medium is arranged laterally next to the part of the roller circumference of each roller 1, 2 which runs from bottom to top.
  • the application device 5 applies coating color and the application device 6 glue to the roller.
  • the paper web 4 is guided from top to bottom through the nip 3.
  • a film of a flowable medium is applied to the paper web in the areas 7, 8 which the nip forms with the paper web.
  • the coating slip or glue is applied to the paper web in the desired thickness.
  • a distribution element 10 is arranged on the side of the coating slip.
  • this grater is a rotationally symmetrical body 10a, which is pressed against the paper web coated with coating slip with a certain pressure.
  • This roller is rotatably supported and is driven. It rotates about its own axis in the direction of the paper web or in the opposite direction and, due to a further drive, which is not shown in detail here, performs oscillating movements transversely to the paper web.
  • the paper web is then fed to further working devices via a deflecting element, shown here as deflecting roller 11a.
  • a total of 11 drive options can be met with this version.
  • the main distinguishing features are the direction of rotation in relation to the running direction of the paper web and the relative speed between the roller circulation and the paper web speed.
  • roller rotates in the opposite direction to the running direction of the paper web, a rubbing effect can only be achieved by the rotation of the roller, but only along the direction of the paper web running.
  • the additional oscillation of the roller transverse to the paper web direction favors the rubbing effect. Oscillating movements along the direction of the paper web and a combination of longitudinal and transverse movements with respect to the paper web are possible.
  • the roller is normally driven, either in the same direction or in opposite directions with respect to the paper web.
  • the relative speed required here is set to an optimal value.
  • roller If the roller is rotatably supported and is not driven, it can be taken along by the paper web due to its speed. A device that brakes the roller is then necessary in order to achieve the rubbing effect. In addition, it is also expedient here to have the roller perform oscillating movements transverse to the direction of the paper web in order to ensure a good rubbing effect over the entire plane of the paper web.
  • the surface of the roller can be smooth or designed as a profile.
  • Another option is a wire-wrapped roller.
  • Smooth rollers are preferably provided with a Cr cover or paint repellent and wear-resistant coatings, such as. B. Teflon, rubber, polyurethane or ceramic.
  • the roller diameter is preferably 100 to 400 mm.
  • FIG. 11 shows a two-roll press analogous to FIG. 10.
  • a roller 1 and a roller 2 which are arranged axially parallel to one another and rotatably mounted and together form a roller nip 3 for passing a paper web 4.
  • the two rollers are driven in opposite directions to each other.
  • An application unit 5, 6 for a flowable medium is arranged laterally next to the part of the roller circumference of each roller 1, 2 which runs from bottom to top.
  • the paper web 4 is guided from top to bottom through the nip 3.
  • a film of flowable medium is applied to the paper web in the areas 7, 8 which the nip forms with the paper web. Both application devices apply coating color to the surface of the roller.
  • the coating slip is applied to the paper web in the desired thickness.
  • a grater is arranged on both sides for rubbing the coating slip.
  • These distribution elements are a rod in the figure.
  • the surface of the rod can be smooth, the diameter is preferably 10-30 mm. It is also possible to wrap the rod with wire or to give its surface a profile.
  • the rod itself rotates very slowly for the purpose of self-cleaning and to avoid local wear.
  • additional drive options that are not shown in the figure are to be provided for the realization of oscillating movements around the rod axis as well as longitudinally in or transverse to the direction of the paper web or a combination of longitudinal and transverse movements relative to the paper web.
  • the distribution elements are preferably arranged on both sides of the paper web so that they are offset from one another in the running direction.
  • the paper web 4 is passed on to the distribution elements via a deflection device, here a deflection roller 11a.
  • a deflection roller 11a There is also the possibility, in order to avoid the contact of a still wet or damp, coated paper web with the deflecting roller 11a, to provide a drying process between the deflecting roller and the grater.
  • FIG. 12 shows the 2-roll press arrangement already described in FIG. 10 in a modified form.
  • grating members 10a are also arranged on both sides here. These can be designed as described in FIG. 10 or in FIG. 11. Analogously to this, the drive options as in the figures already described can also be implemented.
  • the deflection of the paper web takes place here contactlessly via an air cushion deflection device 11b.
  • This has the advantage that even paper webs still damp from the coating color can be deflected without directly contacting the paper web side still wet from coating color with a deflecting element, and prior intermediate drying is not necessary.
  • the paper web is then dried by means of an infrared device 12a.
  • a further possibility for the subsequent drying is shown in FIG. 12b and consists in subjecting the paper web to a floating drying 12b after the infrared drying 12a.
  • the two-roll press arrangement shown in FIG. 13 corresponds in structure and function essentially to the arrangement described in FIG.
  • the reference symbols are assigned accordingly.
  • Rods with a work surface 10b which is convex in their side view, here designed as hydrobar shoes, are used as the distribution elements.
  • the radius of curvature of the working surface of the rod 10b is preferably chosen to be larger than the radius of the rollers used for it, so that the effective working surface of the grater is larger.
  • the hydrobar shoes can be stationary or equipped with an additional drive for realizing oscillating movements transverse to the paper web, which is not shown in the figure.
  • the surface of the hydrobar shoe can be smooth or can be provided with a profile, as illustrated in FIGS. 14 and 15.
  • the profile will preferably not extend over the entire surface of the hydrobar shoe, but only over the first rising part of the curve in the running direction of the paper web. The following descending part is executed smoothly. This ensures that the top layer roughened with a bump and then rubbed evenly. The paper web is then z. B. supplied subsequent drying facilities.
  • FIG. 14a, 14b and 14c show possibilities for the profile design.
  • the profile of the work surface shown in FIG. 14a is wavy.
  • Figures 14b and 14c illustrate the possibility of using and a rack and a rack profile.
  • FIGS. 15a, 15b and 15c provide an overview of possible profile contours in a top view. Parallel profile contours, profile contours with a pitch and profile contours with changing pitch are conceivable.

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  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The coating is applied at stations. Part of the total coating is applied at each station, and the sum of the coating stations equals the amt. of coating to be applied. The paper web is dried between each coating station. Pref. coating station which gives an indirect cladding action comprises two parallel rollers with a gap between them for the paper web to pass through. Applicator jet(s) is directed at the mantle surface of one roller for the coating medium to be transferred to the web at the roller gap. Each coating station delivers only part of the total coating, and a dryer is after each station. The total vol. of coating material is pref. initially applied to one side of the web, required for that side, and the web is dried. The amt. of coating required for the other side is then applied, and the web is dried again. With station(s) part of the coating is applied and the web is dried, and a further station where the remainder of the coating is applied and the web is dried again. The amt. of coating applied to each side of the web is more than 3 g/m2, e.g. 4-8 g/m2. After each coating, the web is dried to less than 70% of the dry rating. Each station is pref. a double coating station, with a jet directed at each roller mantle. Or each station is a single applicator station, with a jet directed at only one roller mantle. In the assembly, station(s) is a double unit and station(s) is a single applicator machine.

Description

Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zum Bestreichen einer Papierbahn. Auf die Oberbegriffe des Verfahrensanspruches bzw. des Vorrichtungsanspruches wird verwiesen.The invention relates to a method and an apparatus for coating a paper web. Reference is made to the generic terms of the method claim and the device claim.

Der Stand der Technik ist aus den folgenden Druckschriften bekannt:

  • (1) DE-U-8 414 413
  • (2) US-A-2 729 192
  • (3) US-A-2 946 307
  • (4) US-A-3 084 663
  • (5) Wochenblatt für Papierfabrikation 1973,
    Seiten 164 bis 169
  • (6) Wochenblatt für Papierfabrikation 1978,
    Seiten 773 bis 778
  • (7) US-A-5 12 653
  • (8) DE-A-21 43 635
  • (9) US-A-3 952 119
The prior art is known from the following publications:
  • (1) DE-U-8 414 413
  • (2) US-A-2 729 192
  • (3) US-A-2 946 307
  • (4) US-A-3,084,663
  • (5) weekly paper production 1973,
    Pages 164 to 169
  • (6) weekly paper production 1978,
    Pages 773 to 778
  • (7) US-A-5 12 653
  • (8) DE-A-21 43 635
  • (9) US-A-3,952,119

Die Erfindung geht von Druckschrift (8) aus, inbesondere von deren Figur 1. Aus der Druckschrift (8) ist ein Verfahren bekanntgeworden, bei dem in einem einzigen Durchlauf eine Emulsionsschicht und eine Tonschicht als dünne, feuchte Filme auf die Papierbahn übertragen werden und die Tonschicht im Anschluß an ihre Trocknung mit einem sichtbaren Rotationsaufdruck versehen wird.The invention is based on document (8), in particular on its figure 1. From document (8), a method has become known in which an emulsion layer and a clay layer are transferred to the paper web as thin, moist films in a single pass, and the Clay layer is provided with a visible rotation print after drying.

Aus der Druckschrift (1) ist eine Vorrichtung bekannt, bei der zwei Auftragswalzen vorgesehen sind, die einen Spalt miteinander bilden, durch den eine Papierbahn hindurchläuft. Beiden Auftragswalzen ist je ein Düsenauftragswerk zugeordnet, das jeweils einen Streichfarbenfilm auf die Mantelfläche der betreffenden Walze aufbringt. Das Düsenauftragswerk hat eine Düse mit zwei Düsenlippen, von denen die eine an ihrem freien Ende eine Rollrakel trägt. Dies ist ein Stab mit einer gerillten Mantelfläche. Damit ist ein dosierter Auftrag von Streichfarbe auf die Mantelfläche der betreffenden Walze möglich. Es handelt sich hierbei demgemäß um ein indirektes Auftragsverfahren, da der Strich zunächst auf die Mantelfläche der Walze aufgetragen und von dort auf die Papierbahn übertragen wird.From the document (1) a device is known in which two application rollers are provided which form a nip with one another through which a paper web runs. A nozzle applicator is assigned to each of the application rollers, each of which applies a coating color film onto the Applying the outer surface of the roller in question. The nozzle applicator has a nozzle with two nozzle lips, one of which carries a doctor blade at its free end. This is a rod with a grooved outer surface. A metered application of coating color on the outer surface of the roller in question is thus possible. Accordingly, this is an indirect application method, since the line is first applied to the outer surface of the roller and is transferred from there to the paper web.

Die Druckschrift (9) offenbart ein Verfahren, bei dem ein Papier mit einer rauhen Oberfläche durch ein Magnet-Roll-System und ein Flexodruck-System auf Raten gefärbt wird.Document (9) discloses a method in which a paper with a rough surface is colored at a rate by a magnetic roll system and a flexographic printing system.

Bei der Papier- und Kartonherstellung wird schon seit vielen Jahren Altpapier eingesetzt, insbesondere bei Hygienepapieren und bei Zeitungsdruckpapieren. Bei Schreib- und Druckpapieren hingegen ist der Einsatz von Altpapier bisher noch gering.Waste paper has been used in the manufacture of paper and cardboard for many years, in particular with hygienic paper and newsprint. In contrast, the use of waste paper has so far been low for writing and printing paper.

Der Einsatz von Altpapier ist sehr wünschenswert, da Altpapier in reichem Maße vorhandener Halbstoff ist, der verhältnismäßig billig ist. Andererseits bringt das Altpapier technische Probleme mit sich. Zum einen ist die Festigkeit von Papieren mit hohem Altpapiereintrag relativ gering, zum anderen enthält Altpapier naturgemäß Schmutzstoffe in Gestalt von Staub, was vor allem in Offset-Druckmaschinen problematisch ist. Die geringe Festigkeit von altpapierhaltigem Streichrohpapier macht sich beim Streichprozeß selbst unangenehm bemerkbar. Die Streichfarbe enthält nämlich einen hohen Wasseranteil in der Größenordnung von 50 % der Gesamtstreichfarbe. Beim Streichen penetriert ein wesentlicher Teil dieses Wassers in das Papier, wobei dessen Festigkeit naturgemäß dramatisch abfällt. Damit erhöht sich die Abrißgefahr entsprechend stark. Bei relativ geringen Streichfarbenmengen, ausgedrückt in g/m2 penetriert relativ wenig Wasser in das Papier hinein, so daß die Festigkeitsverringerung noch tolerabel ist. Bei höheren Streichfarben-Auftragsgewichten, etwa ab 5 g/m2, steigert sich jedoch die Abrißgefahr ganz erheblich.The use of waste paper is very desirable, since waste paper is an abundant pulp that is relatively cheap. On the other hand, the waste paper brings with it technical problems. On the one hand, the strength of papers with a high waste paper input is relatively low, on the other hand, waste paper naturally contains contaminants in the form of dust, which is particularly problematic in offset printing machines. The low strength of scrap base paper containing waste paper makes itself unpleasantly noticeable in the coating process. The coating color contains a high proportion of water in the order of 50% of the total coating color. When brushing, a substantial part of this water penetrates into the paper, whereby its strength naturally drops dramatically. This increases the risk of tearing accordingly. With relatively small amounts of coating color, expressed in g / m 2, penetrates relatively little Water into the paper so that the reduction in strength is still tolerable. With higher coating color application weights, for example from 5 g / m 2 , the risk of tearing increases considerably.

Die genannte Staubungsneigung von altpapierhaltigem Streichrohpapier als zweitem Problemfaktor macht eine sorgfältige Auswahl des Streichverfahrens aus der Vielzahl von möglichen Streichverfahren notwendig.The above-mentioned tendency to dust of waste paper-containing coating base paper as the second problem factor makes it necessary to carefully select the coating method from the large number of possible coating methods.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren sowie eine Vorrichtung anzugeben, um eine Papierbahn geringer Festigkeit, insbesondere auf Altpapierbasis, bei hohen Streichfarben-Auftragsgewichten streichen zu können, ohne daß die Gefahr eines Abrisses besteht.The invention is based on the object of specifying a method and a device in order to be able to coat a paper web of low strength, in particular based on waste paper, with high coating color application weights without the risk of tearing.

Die Aufgabe wird durch die kennzeichnenden Merkmale des Verfahrensanspruches 1 sowie des Vorrichtungsanspruches 5 gelöst.The object is achieved by the characterizing features of method claim 1 and device claim 5.

Die Erfindung ist anhand der Zeichnungen näher erläutert. Die beiden Figuren zeigen in schematischer Darstellung zwei sogenannte On-Machine-Coater. Die Erfindung ist natürlich auch bei Off-Line-Coatem anwendbar.The invention is explained in more detail with reference to the drawings. The two figures show a schematic representation of two so-called on-machine coaters. The invention is of course also applicable to off-line coatings.

Figur 1 zeigt den prinzipiellen Aufbau einer Papiermaschine mit einer Streicheinrichtung. In Figur 1 erkennt man einen Endbereich einer Trockenpartie 1 mit einer Vielzahl von Trockenzylindem, um welche eine Papierbahn 2 mäanderförmig herumgeführt ist. Die Trockenpartie ist zweireihig, d.h. sie weist eine Vielzahl von oberen und von unteren Trockenzylindem auf, die jeweils in zwei horizontalen Reihen angeordnet sind. Beim Umlauf um die einzelnen Trockenzylinder ist die Papierbahn zwischen der Mantelfläche des betreffenden Trockenzylinders und einem Trockensieb sandwichartig eingehüllt.Figure 1 shows the basic structure of a paper machine with a coating device. 1 shows an end region of a drying section 1 with a multiplicity of drying cylinders, around which a paper web 2 is guided in a meandering manner. The dryer section has two rows, ie it has a plurality of upper and lower dryer cylinders, each of which is arranged in two horizontal rows. When circulating around the individual drying cylinders, the paper web is sandwiched between the outer surface of the drying cylinder in question and a dryer fabric.

Bei der dargestellten Anlage folgt ein Glättwerk, das als sogenannter Soft-Nip-Calender ausgeführt ist.The system shown is followed by a smoothing unit, which is designed as a so-called soft nip calendar.

Wie man sodann erkennt, wird die Papierbahn an einer Umlenkwalze 4 vertikal nach unten umgelenkt. Es folgt eine Anzahl weiterer Umlenkwalzen 4.1, 4.2, 4.3, 4.4. Hieran schließt sich eine Streichstation 5 an. Die Streichstation 5 umfaßt im Gegensatz zum erfindungsgemäßen Verfahren nur zwei Walzen 5.1 und 5.2. Diese sind parallel zueinander angeordnet und bilden miteinander einen Walzenspalt, durch welchen die Papierbahn 2 hindurchgeführt wird. Die beiden Walzen sind derart angeordnet, daß sich die Walze 5.2 senkrecht über der Walze 5.1 befindet. Der Walze 5.1 ist ein Düsenauftragswerk 5.3 zugeordnet - siehe DE-U-8 414 413. Dieses Düsenauftragswerk 5.3 weist zwei hier nicht näher dargestellte maschinenbreite Düsenlippen auf. Die in Umlaufrichtung von Walze 5.1 gesehen zweite Düsenlippe trägt eine Rollrakel mit gerillter Mantelfläche. Diese Rollrakel dosiert die Streichfarbenmenge exakt auf die Mantelfläche der Walze 5.1. Genau diese Streichfarbenmenge wird im Walzenspalt auf die ankommende Papierbahn 2 übertragen, und zwar naturgemäß nur auf deren eine Seite. Der Walze 5.2 ist ein Schaber 5.4 zugeordnet. Die somit einseitig bestrichene Papierbahn 2 durchläuft den Walzenspalt, gelangt um Umlenkwalzen 4.5, 4.6, 4.7 und 4.8, wobei sie u.a. eine Trockenstation 6 durchläuft. Von weiteren Umlenkwalzen abgesehen folgt sodann eine Mini-Trockenpartie 7, wiederum mit Trockenzylindem. Es schließt sich eine zweite Streichstation 8 an. Diese weist wiederum zwei Walzen 8.1 und 8.2 auf. Der Walze 8.1 ist wiederum ein Düsenauftragswerk 8.3 zugeordnet, das analog dem Düsenauftragswerk 5.3 aufgebaut ist. Hiermit wird die andere Seite der Papierbahn mit einem Strich versehen.As can then be seen, the paper web is deflected vertically downwards on a deflection roller 4. A number of further deflection rollers 4.1, 4.2, 4.3, 4.4 follow. This is followed by a coating station 5. In contrast to the method according to the invention, the coating station 5 comprises only two rollers 5.1 and 5.2. These are arranged parallel to one another and together form a nip through which the paper web 2 is passed. The two rollers are arranged such that the roller 5.2 is perpendicular to the roller 5.1. The roller 5.1 is assigned a nozzle applicator 5.3 - see DE-U-8 414 413. This nozzle applicator 5.3 has two machine-wide nozzle lips, not shown here. The second nozzle lip seen in the direction of rotation of roller 5.1 carries a roller doctor with a grooved outer surface. This roller doctor metered the amount of coating color exactly onto the outer surface of the roller 5.1. Exactly this amount of coating color is transferred to the incoming paper web 2 in the nip, and naturally only on one side thereof. A scraper 5.4 is assigned to the roller 5.2. The paper web 2 thus coated on one side passes through the nip, passes around deflecting rollers 4.5, 4.6, 4.7 and 4.8, whereby it passes through a drying station 6. Apart from further deflecting rollers, a mini drying section 7 then follows, again with drying cylinders. A second coating station 8 follows. This in turn has two rollers 8.1 and 8.2. The roller 8.1 is in turn assigned a nozzle applicator 8.3, which is constructed analogously to the nozzle applicator 5.3. The other side of the paper web is hereby provided with a line.

Es schließen sich eine weitere Mini-Trockengruppe 9 sowie eine Aufrolleinrichtung 10 an.Another mini dryer group 9 and a rolling device 10 follow.

Bei dieser Anlage wird entgegen der Erfindung in der ersten Streichstation 5 die eine Seite der Papierbahn vollständig gestrichen und sodann in der zweiten Streichstation 8 die andere Seite der Papierbahn. Es wird somit jeweils dasjenige Streichfarben-Auftragsgewicht in der betreffenden Streichstation aufgebracht, das auch das endgültige Streichfarben-Auftragsgewicht der betreffenden Seite ist. Die zweite Streichstation befindet sich an einer solchen Stelle, an welcher die Papierbahn aufgrund der vorausgegangenen Trocknung eine genügend hohe Festigkeit hat, um einen neuen Streichvorgang mit der entsprechenden Wasserpenetration abrißfrei zu überstehen.In this system, contrary to the invention, one side of the paper web is completely coated in the first coating station 5 and then the other side of the paper web in the second coating station 8. The coating color application weight that is also the final coating color application weight of the page in question is thus applied in the coating station in question. The second coating station is located at a point at which the paper web has sufficient strength due to the previous drying to survive a new coating process with the corresponding water penetration without tearing.

Mit dieser Einrichtung können Streichrohpapiere mit relativ hohem Altpapiereinsatz und verhältnismäßig geringer Ausgangsfestigkeit mit Streichfarben-Auftragsmengen bei bis zu 8 g/m2 versehen werden.Coating base papers with a relatively high amount of waste paper and a relatively low initial strength can be coated with coating quantities of up to 8 g / m 2 with this device.

Die einzelnen Streichstationen sind solche, bei welchen die Papierbahn mit einem indirekten Auftrag versehen wird, indem der Strich von der Mantelfläche der Walze auf die Papierbahn übertragen wird. Hierbei ist ganz entscheidend, daß kein Rakelelement an die Papierbahn angesetzt werden muß, da nämlich der Strich bereits auf der Mantelfläche der Walze seine endgültige Stärke und Dosierung bereits erlangt hat. Die gewählte Streichstation mit ihrem indirekten Auftragsverfahren stellt sicher, daß die bestrichene Seite der Papierbahn vollständig mit Streichfarbe versiegelt wird, so daß Staub und sonstige Partikel, welche bei Papieren auf Altpapierbasis an der Oberfläche haften, in perfekter Weise eingehüllt werden.The individual coating stations are those in which the paper web is provided with an indirect application by transferring the line from the outer surface of the roller to the paper web. It is very important that no doctor element has to be attached to the paper web, because the line has already reached its final thickness and dosage on the outer surface of the roller. The selected coating station with its indirect application process ensures that the coated side of the paper web is completely sealed with coating color, so that dust and other particles which adhere to the surface of paper based on waste paper are enveloped in a perfect manner.

Die Figuren 1a, 1b und 1c zeigen Einzelheiten und unterschiedliche Ausführungsformen der Anlage gemäß Fig. 1. Hierbei ist jeweils ein Verreibeelement 20.1, 20.2, 20.3 vorgesehen. Dies kann ein Rundstab von größerem oder kleinerem Durchmesser sein (Fig. 1a bzw. Fig. 1b), oder ein stabförmiger Körper mit unrundem Querschnitt (Fig. 1c). Das Verreibeelement kann in seiner eigenen Längsrichtung oszillieren oder in Laufrichtung der Papierbahn oder bei runden Verreibeorganen um die eigene Achse umlaufen. Auch ein rotierendes Oszillieren ist möglich. Die Oberfläche kann höchst unterschiedlich sein, z.B. völlig glatt, poliert, gerillt, aus umlaufenden Drähten erzeugt.FIGS. 1a, 1b and 1c show details and different embodiments of the system according to FIG. 1. In this case, a grater element 20.1, 20.2, 20.3 is provided. This can be a round rod of larger or smaller diameter (Fig. 1a or Fig. 1b), or a rod-shaped body with a non-circular cross-section (Fig. 1c). The grating element can oscillate in its own longitudinal direction or rotate around its own axis in the direction of travel of the paper web or in the case of round distribution elements. Rotating oscillation is also possible. The surface can be very different, for example completely smooth, polished, grooved, made from all-round wires.

Die in Fig. 2 dargestellte Anlage ist ähnlich wie die Anlage gemäß Fig. 1 aufgebaut. Man erkennt auch hier wieder das Ende einer zweireihigen Zylindertrockenpartie 1, ferner ein Glättwerk 3, eine erste Streichstation 5, einen dieser nachgeschalteten Trockner 6, eine Trockenpartie 7 mit Trockenzylindem, eine zweite Streichstation 8, einen weiteren Trockner 9, eine Trockenpartie 9.1 mit Trockenzylindern sowie eine Aufrollstation 10.The system shown in FIG. 2 is constructed similarly to the system according to FIG. 1. The end of a two-row cylinder dryer section 1 can also be seen here, furthermore a smoothing unit 3, a first coating station 5, one of these downstream driers 6, a dryer section 7 with drying cylinders, a second coating station 8, a further dryer 9, a dryer section 9.1 with drying cylinders and a reeling station 10.

Im Gegensatz zur Anlage gemäß Fig. 1 weisen die beiden Streichstationen 5 bzw. 8 jeweils zwei Düsenauftragswerke 5.1, 5.2 bzw. 8.1 und 8.2 auf. Dies bedeutet, daß die Papierbahn 2 in jeder Streichstation zweiseitig gestrichen wird. Die Trockner 6 und 9 sind Lufttrockner, die die Bahn frei tragen und auf einen solchen Trockengehalt bringen (nach Möglichkeit wenigstens 70 % atro), bis der Strich in den anschließenden Zylindertrockenpartien 7 bzw. 9.1 berührungsfähig ist.In contrast to the system according to FIG. 1, the two coating stations 5 and 8 each have two nozzle applicators 5.1, 5.2 or 8.1 and 8.2. This means that the paper web 2 is coated on both sides in each coating station. The dryers 6 and 9 are air dryers which carry the web freely and bring them to such a dry content (if possible at least 70% dry) until the line in the subsequent cylinder dryer sections 7 and 9.1 is touchable.

Fig. 2a zeigt eine abgewandelte Ausführungsform von Fig. 2. Hierbei ist zunächst ein Infrarottrockner 30 vorgesehen, gefolgt von einem Schwebetrockner (Lufttrockner) 6.9.FIG. 2a shows a modified embodiment of FIG. 2. First, an infrared dryer 30 is provided, followed by a floating dryer (air dryer) 6.9.

Die erfindungsgemäße Anlage gemäß Fig. 3 unterscheidet sich von der Anlage gemäß Fig. 2 wie folgt: Streichstation 5 weist nur eine einzige Auftragsstation 5.1 auf, die der einen der beiden Walzen der Streichstation 5 zugeordnet ist. Auch hier ist der Streichstation 5 ein Verreibeorgan 20.5 nachgeschaltet. Streichstation 8 weist ebenfalls nur eine einzige Auftragsstation 8.1 auf. Ein Verreibeorgan 20.6 ist nachgeschaltet. Der Auftrag ist somit an jeder Streichstation 5 bzw. 8 nur ein einseitiger.The system according to FIG. 3 differs from the system according to FIG. 2 as follows: coating station 5 has only a single application station 5.1, which is assigned to one of the two rollers of coating station 5. Here, too, the coating station 5 is followed by a grater 20.5. Coating station 8 also has only one Order station 8.1 on. A distribution element 20.6 is connected downstream. The application is therefore only one-sided at each coating station 5 or 8.

Der Grundgedanke des erfindungsgemäßen Streichens auf Raten mit nachfolgendem Trocknen auf Raten läßt sich auf unterschiedliche Weise durchführen:The basic idea of painting on rates in accordance with the invention with subsequent drying on rates can be carried out in different ways:

So kann beispielsweise zunächst nur die eine Seite der Papierbahn gestrichen und anschließend getrocknet werden, und dann die andere Seite der Papierbahn gestrichen und getrocknet werden. Entscheidend ist jedoch immer, daß nur eine Teilmenge des Gesamtstriches aufgetragen wird.For example, first only one side of the paper web can be coated and then dried, and then the other side of the paper web can be coated and dried. It is always crucial, however, that only a subset of the total coat is applied.

So ist es möglich, die beiden Seiten unterschiedlich stark zu streichen, die eine Seite mit einer ganz minimalen Streichfarben-Auftragsmenge, und die andere Seite mit einer verhältnismäßig hohen Streichfarben-Auftragsmenge, jedoch immer noch nicht der vollen Streichfarben-Auftragsmenge, die dieser Seite insgesamt zukommen soll.It is thus possible to coat the two sides to different extents, one side with a very minimal coating color application quantity and the other side with a relatively high coating color application quantity, but still not the full coating color application quantity that this page as a whole should come.

Es versteht sich, daß jeweils nach jedem Streichvorgang entsprechende Trockeneinrichtungen vorzusehen sind. Die Auswahl des Trocknungsverfahrens und der entsprechenden Trocknungseinrichtung bleibt dem Fachmann überlassen. Er kann beispielsweise Infrarottrockner, luftgeführte Trockner oder Zylindertrockner verwenden. Bei der Ausführungsform gemäß Fig. 2 sind beispielsweise die Trockner 6 und 9 mit einer derart hohen Trockenkapazität ausgestattet, daß es keiner weiteren Trocknungsaggregate zwischen Streichstation und Zylindertrocknungseinrichtung bedarf.It goes without saying that appropriate drying devices must be provided after each coating process. The choice of the drying process and the corresponding drying device is left to the expert. For example, he can use infrared dryers, air-guided dryers or cylinder dryers. In the embodiment according to FIG. 2, for example, the dryers 6 and 9 are equipped with such a high drying capacity that no further drying units are required between the coating station and the cylinder drying device.

Die Figuren 4-6 und 7-9 zeigen schematisch denkbare Konfigurationen unter Anwendung der Erfindung. Allen diesen Konfigurationen sind zwei Streichstationen gemeinsam. Zur besseren Übersichtlichkeit sind nur die wesentlichen Komponenten der einzelnen Konfigurationen näher bezeichnet.Figures 4-6 and 7-9 show schematically conceivable configurations using the invention. All of these configurations are two Coating stations together. For better clarity, only the essential components of the individual configurations are described in more detail.

Bei der Anlage gemäß Fig.4 wird die Papierbahn in Pfeilrichtung von unten her einer ersten Streichstation 1 zugeführt, sodann einer zweiten Streichstation 2, einer ersten Infrarotstrecke 3, einer zweiten Infrarotstrecke 4, einem Schwebebahntrockner 5 sowie schließlich einer Trockenpartie 6. Dabei dient die erste Streichstation 1 dem Leimen oder dem Pigmentieren bzw. Vorstreichen. Hierbei handelt es sich um ein indirektes Streichverfahren, da ein Düsenauftragswerk 1.1 zunächst den Strich auf eine Auftragswalze 1.2 aufträgt, die den Strich sodann an die Papierbahn abgibt.4, the paper web is fed in the direction of the arrow from below to a first coating station 1, then to a second coating station 2, a first infrared path 3, a second infrared path 4, a suspension rail dryer 5 and finally a dryer section 6. The first serves Coating station 1 for gluing or pigmenting or priming. This is an indirect coating process since a nozzle applicator 1.1 first applies the line to an applicator roller 1.2, which then delivers the line to the paper web.

Bei der zweiten Streichstation 2 wird zunächst Streichfarbe in einem ersten Düsenauftragswerk 2.1 direkt auf die Papierbahn aufgetragen, sodann folgt ein zweites Düsenauftragswerk für besonders kurze Verweilzeit (sogenanntes SDTA-Prinzip) mit integriertem Rakelbalken.In the second coating station 2, coating color is first applied directly to the paper web in a first nozzle applicator 2.1, followed by a second nozzle applicator for a particularly short residence time (so-called SDTA principle) with an integrated doctor bar.

Die Konstruktion ist derart gestaltet, daß sowohl das erste Düsenauftragswerk 2.1 als auch das zweite Düsenauftragswerk 2.2 mit Rakelbalken 2.3 bei Bedarf abgeschwenkt werden kann, so daß an Streichstation 2 überhaupt nichts aufgetragen wird. Zwischen der ersten Streichstation 1 und der zweiten Streichstation 2 ist eine Infrarottrocknungs-Einheit 6 und eine Heißluft-Trocknungs-Einheit 7 zwischengeschaltet.The construction is designed such that both the first nozzle applicator 2.1 and the second nozzle applicator 2.2 can be pivoted with doctor bars 2.3 if necessary, so that nothing is applied to coating station 2 at all. An infrared drying unit 6 and a hot air drying unit 7 are interposed between the first coating station 1 and the second coating station 2.

Das Düsenauftragswerk 2.1 kann ein sogenannter SDTA sein, beispielsweise wie in VOITH-Sonderdruck p 2865 11/92 in Abb. 18 und 21 dargestellt. Dieses Auftragswerk kann eine stabförmige Rakel mit glatter oder profilierter Mantelfläche aufweisen, aber auch eine Klinge. Dabei kommt eine sogenannte "stiff blade" oder eine "bent blade" in Betracht.The nozzle applicator 2.1 can be a so-called SDTA, for example as shown in VOITH special print p 2865 11/92 in Fig. 18 and 21. This application unit can have a rod-shaped doctor blade with a smooth or profiled outer surface, but also a blade. A so-called "stiff blade" or a "bent blade" can be considered.

Auftragswerk 2.1 kann aber auch ein Düsenauftragswerk ohne Rakelelement sein, zum Auftragen der Streichfarbe im freien Strahl als "vorhang" auf die Papierbahn (sogenanntes "Fountain-Coating"). Ein solches Auftragswerk ist in Abb. 20 und 21 der genannten VOITH-Veröffentlichung gezeigt.Application unit 2.1 can also be a nozzle application unit without a doctor element, for applying the coating color in the free jet as a "curtain" on the paper web (so-called "fountain coating"). Such a commissioned work is shown in Fig. 20 and 21 of the VOITH publication mentioned.

In einer verbesserten Ausführungsform können vor und nach Streichstation 1 Leitwalzen zwecks genauer Einstellung des Umschlingungswinkels vorgesehen sein.In an improved embodiment, guide rollers can be provided before and after coating station 1 for the purpose of precise adjustment of the wrap angle.

Des weiteren ist es möglich, bei Streichstation 1 die Gegenwalze abfahrbar auszubilden.Furthermore, it is possible to design the counter roll to be removable at coating station 1.

Die beschriebenen Besonderheiten - insbesondere bezüglich der Düsenausbildung, bezüglich der Walzenabhebung sowie bezüglich der vor- und nachgeschalteten Leitwalzen - können alternativ auch bei sämtlichen Ausführungsformen gemäß der Figuren 4 bis 6 und 7 bis 9 vorhanden sein.The special features described - in particular with regard to the nozzle design, with respect to the roll lifting and with regard to the upstream and downstream guide rolls - can alternatively also be present in all of the embodiments according to FIGS. 4 to 6 and 7 to 9.

Bei Station 2 kann statt des Düsenauftragswerks 2.1 ein Walzenauftragswerk vorgesehen werden.At station 2, a roller applicator can be provided instead of the nozzle applicator 2.1.

Bei Streichstation 1 kann ein sogenannter Schleifauftrag an Walze 1.2 vorgesehen werden, wobei eine Differenzgeschwindigkeit zwischen der Bahngeschwindigkeit und der Umfangsgeschwindigkeit von Walze 1.2 herrscht. Die Differenzgeschwindigkeit kann das 0,1-fache der Bahngeschwindigkeit betragen, und zwar nach beiden Richtungen. Der Umschlingungswinkel der Walze 1.2 durch die Bahn wird im allgemeinen zwischen 5 und 25° liegen.At coating station 1, a so-called grinding application can be provided on roller 1.2, with a difference in speed between the web speed and the peripheral speed of roller 1.2. The differential speed can be 0.1 times the web speed, in both directions. The angle of wrap of the roller 1.2 through the web will generally be between 5 and 25 °.

Bei der Anlage gemäß Fig. 4 sind weitere Bauteile vorgesehen. Streichstation 1 weist ein zweites Düsenauftragswerk auf, und zwar das Düsenauftragswerk 1.3, das einer Walze 1.4 zugeordnet ist. Außerdem ist auf der den Trocknungseinrichtungen 6 und 7 gegenüberliegenden Seite eine Infrarottrocknungs-Einrichtung 8 vorgesehen.4 further components are provided. Coating station 1 has a second nozzle applicator, namely the nozzle applicator 1.3, which is assigned to a roller 1.4. Also on the Drying devices 6 and 7 opposite side an infrared drying device 8 is provided.

Die Anlage gemäß Fig. 6 entspricht im wesentlichen jener gemäß Fig. 4 Jedoch sind hierbei zwischen den beiden Streichstationen 1 und 2 auf beiden Seiten der Papierbahn je eine Infrarottrocknungs-Einrichtung und eine Heißlufttrocknungs-Einrichtung 6.1, 6.2 und 7.1, 7.2 zwischengeschaltet.6 corresponds essentially to that of FIG. 4. However, an infrared drying device and a hot air drying device 6.1, 6.2 and 7.1, 7.2 are interposed between the two coating stations 1 and 2 on both sides of the paper web.

Bei einer weiteren Ausführungsform gemäß Fig. 7 läuft die Papierbahn in einer im wesentlichen horizontalen Richtung direkt durch die beiden Streichstationen 1 und 2 hindurch. Streichstation 1 weist wiederum ein Auftragswerk 1.1 mit Auftragswalze 1.2 auf. Streichstation 2 ist ein erstes Düsenauftragswerk 2.1 und ein zweites Düsenauftragswerk 2.2 mit integriertem Rakelbalken 2.3 zugeordnet. Es folgt ein Schwebebahntrockner 5 sowie schließlich eine Trockengruppe 6.In a further embodiment according to FIG. 7, the paper web runs directly through the two coating stations 1 and 2 in a substantially horizontal direction. Coating station 1 again has an applicator unit 1.1 with an applicator roller 1.2. Coating station 2 is assigned a first nozzle applicator 2.1 and a second nozzle applicator 2.2 with an integrated doctor bar 2.3. This is followed by a suspension railway dryer 5 and finally a dryer group 6.

Auf der einen Seite der Papierbahn sind zwischen den beiden Streichstationen 1 und 2 eine Infrarottrocknungs-Einrichtung 6 und eine Heißlufttrocknungs-Einrichtung 7 zwischengeschaltet.An infrared drying device 6 and a hot air drying device 7 are interposed on one side of the paper web between the two coating stations 1 and 2.

Die Anlage gemäß Fig. 4 arbeitet nach dem sogenannten Naß-in-Naß-Prinzip.4 operates on the so-called wet-on-wet principle.

Dem Zwischentrocknen des mit der Streichstation 1 aufgebrachten Striches dienen die verschiedenen Infrarottrocknungs-Einrichtungen bzw. Lufttrocknungs-Einrichtungen.The various infrared drying devices or air drying devices serve for intermediate drying of the line applied with the coating station 1.

Bei der Anlage gemäß Fig. 5 beinhaltet Streichstation 1, wie erwähnt, zwei Düsenauftragswerke 1.1 und 1.3. Hierbei ist es besonders zweckmäßig, eine Infrarottrocknung und eine Lufttrocknung unmittelbar nachzuschalten. Mit diesem Auftragskonzept ist es möglich, in Streichstation 1 simultan beide Papierseiten mit einer Leim- oder Pigmentsuspension zu behandeln, und derart weit auszutrocknen, daß der Strich in Streichstation 2 durch die Gegenwalze berührfähig ist.5, coating station 1 contains, as mentioned, two nozzle applicators 1.1 and 1.3. It is particularly expedient here to immediately connect infrared drying and air drying. With this application concept, it is possible to simultaneously treat both sides of the paper with a glue or pigment suspension in coating station 1, and to dry out to such an extent that the coating in coating station 2 can be touched by the counter roller.

In Streichstation 2 kann sodann der Deckstrich für die Papierunterseite entweder mit dem ersten Düsenauftragswerk 2.1 oder mit dem nachgeschalteten SDTA-Düsenauftragswerk 2.2 aufgetragen werden. Die Egalisierung wird mittels einer Klinge oder eines Stabes vorgenommen. Mit dieser Variante, d.h. Anlage 6, werden zwei Bauprinzipien derart vereint, daß sich deren Vorteile kombinieren, jedoch die Nachteile nicht in Erscheinung treten. Im einzelnen handelt es sich um folgendes:In coating station 2, the top coat for the paper underside can then be applied either with the first nozzle applicator 2.1 or with the downstream SDTA nozzle applicator 2.2. The leveling is carried out using a blade or a stick. With this variant, i.e. Appendix 6, two construction principles are combined in such a way that their advantages combine, but the disadvantages do not appear. The details are as follows:

Das Auftragen mit Düsenauftragswerk auf indirekte Weise - d.h. zunächst auf die Mantelfläche einer Walze und sodann auf die Papierbahn - hat den Vorteil des einwandfreien Auftragens von Streichfarbe ohne die gefürchteten Rakelstreifen. Beim Einsatz von Altpapier ist jedoch die Streichklinge einer solchen Einrichtung als Egalisierelement problematisch.Application with a nozzle applicator in an indirect way - i.e. first on the outer surface of a roller and then on the paper web - has the advantage of the perfect application of coating color without the dreaded squeegee strips. When using waste paper, however, the doctor blade of such a device as a leveling element is problematic.

Die Gestaltung von Streichstation 2 mit Düsenauftragswerk und Streichklinge oder einem Stab als Egalisierelement hinterläßt keinerlei Rakelspuren und ist hervorragend geeignet zum Beseiten des sogenannten Filmsplitting-Phänomens.The design of coating station 2 with nozzle applicator and coating blade or a rod as a leveling element leaves no squeegee marks and is excellently suited for eliminating the so-called film splitting phenomenon.

Bei einer solchen kombinierten Fahrweise kann man somit vor allem altpapierhaltiges Papier mit dem gewünschten Endstrichgewicht erzeugen. In der ersten Streichstation wird mit dem Düsenauftragswerk altpapierhaltiges Rohpapier problemlos vorbehandelt, während die zweite Streichstation mit ihrem Düsenauftragswerk und einer Streichklinge die gewünschte Strichqualität in bezug auf Glätte, Opazität und Oberflächengeschlossenheit sichergestellt.With such a combined mode of operation, it is thus possible to produce primarily waste paper containing the desired final coat weight. In the first coating station, raw paper-containing raw paper is pretreated with the nozzle applicator, while the second coating station with its nozzle applicator and a coating blade ensures the desired coating quality in terms of smoothness, opacity and surface consistency.

Bei dem erfindungsgemäßen Verfahren bzw. der erfindungsgemäßen Vorrichtung kann es zweckmäßig sein, zur Vermeidung des unerwünschten Orangenschaleneffektes des Flüssigkeitsfilmes auf der Papierbahn Maßnahmen zur Vergleichmäßigung des Filmes nach dem Strich zu ergreifen.In the method according to the invention and the device according to the invention, it may be expedient to take measures to make the film uniform after the stroke in order to avoid the undesirable orange peel effect of the liquid film on the paper web.

Die Lösung dieser Teilaufgabe besteht darin, daß den Aufbringeinrichtungen unmittelbar nach dem Walzenspalt im freien Zug der Papierbahn Verreibeorgane nachgeordnet sind. Diese Verreibeorgane bewirken durch eine Relativgeschwindigkeit zwischen der Papierbahn einerseits und der Angriffsfläche des Verreibeorgans andererseits ein Verreiben der Streichmasse im noch fließfähigen Zustand derart, daß eine in sich geschlossene und weitgehend gleichmäßig beschichtete Papierbahnoberfläche erreicht wird. Insbesondere wird dies durch eine rotierende Bewegung des Verreibeorgans und/oder dessen oszillierende Bewegung um die Längsache und/oder dessen oszillierende Bewegungen quer oder längs zur Papierbahn erreicht.The solution to this sub-task is that the application devices are arranged immediately after the nip in the free train of the paper web distribution elements. By means of a relative speed between the paper web on the one hand and the contact surface of the distribution organ on the other hand, these rubbing elements cause the coating slip to be rubbed in the still flowable state in such a way that a self-contained and largely uniformly coated paper web surface is achieved. In particular, this is achieved by a rotating movement of the distribution element and / or its oscillating movement about the longitudinal axis and / or its oscillating movements transversely or longitudinally to the paper web.

In Figur 10 ist eine Zwei-Walzen-Presse dargestellt. Eine Walze 1 und eine Walze 2, die achsparallel zueinander angeordnet und drehbar gelagert sind, bilden miteinander einen Walzenspalt 3 zum Hindurchführen einer Papierbahn 4. Die beiden Walzen sind gegenläufig zueinander angetrieben. Die dargestellte Zwei-Walzenpresse umfaßt zwei Auftragseinrichtungen.A two-roll press is shown in FIG. A roller 1 and a roller 2, which are arranged axially parallel to one another and are rotatably mounted, together form a roller gap 3 for passing a paper web 4. The two rollers are driven in opposite directions to one another. The two-roll press shown comprises two application devices.

Selbstverständlich kann auch nur eine Auftragseinrichtung wie bei den in der Erfindung ausschließlich verwendeten Einfach-Streichstationen vorgesehen sein. Bei derartigen Einrichtungen ist nur einer der Walzen eine Auftragsdüse zugeordnet. In diesem Zusammenhang wird auf die in Fig. 3 dargestellten Verreibeorgane 20.5 und 20.6 verwiesen.Of course, only one application device can be provided as in the single coating stations used exclusively in the invention. In such devices, only one of the rollers is assigned an application nozzle. In this connection, reference is made to the distribution elements 20.5 and 20.6 shown in FIG. 3.

Im folgenden wird die Beschreibung der Funktionsweise des Verreibeorgans nur anhand einer zweiseitigen Auftragseinrichtung beispielhaft beschrieben, ohne daß hierin eine Beschränkung auf diese Art der Auftragung zu sehen wäre.In the following, the description of the mode of operation of the distribution element is described by way of example only with the aid of a two-sided application device, without being restricted to this type of application.

Seitlich neben dem von unten nach oben laufenden Teil des Walzenumfanges jeder Walze 1, 2 ist eine Auftragseinheit 5, 6 für ein fließfähiges Medium angeordnet. Die Auftragseinrichtung 5 bringt dabei Streichfarbe und die Auftragseinrichtung 6 Leim auf die Walze auf. Die Papierbahn 4 wird von oben nach unten durch den Walzenspalt 3 geführt. Dabei wird in den Bereichen 7, 8, die der Walzenspalt mit der Papierbahn bildet, ein Film eines fließfähigen Mediums über die Walzenoberfläche auf die Papierbahn aufgebracht. Durch das Führen der Papierbahn von oben nach unten durch den Walzenspalt wird die Streichmasse bzw. der Leim in der gewünschten Dicke auf die Papierbahn aufgetragen. Im anschließenden freien Zug 9 der Papierbahn ist auf der Seite der Streichmasse ein Verreibeorgan 10 angeordnet. Dieses Verreibeorgan ist im dargestellten Fall ein als Walze ausgeführter rotationssymmetrischer Körper 10a, der mit einem bestimmten Druck an die mit Streichmasse beschichtete Papierbahn angepreßt wird. Diese Walze ist drehbar gelagert und wird angetrieben. Sie rotiert um ihre eigene Achse in Papierbahnlaufrichtung oder gegenläufig und führt aufgrund eines weiteren Antriebes, der hier nicht im einzelnen dargestellt ist, quer zur Papierbahn oszillierende Bewegungen aus.
Die Papierbahn wird dann über ein Umlenkorgan, hier als Umlenkwalze 11a dargestellt, weiteren Arbeitseinrichtungen zugeführt.An application unit 5, 6 for a flowable medium is arranged laterally next to the part of the roller circumference of each roller 1, 2 which runs from bottom to top. The application device 5 applies coating color and the application device 6 glue to the roller. The paper web 4 is guided from top to bottom through the nip 3. A film of a flowable medium is applied to the paper web in the areas 7, 8 which the nip forms with the paper web. By guiding the paper web from top to bottom through the nip, the coating slip or glue is applied to the paper web in the desired thickness. In the subsequent free train 9 of the paper web, a distribution element 10 is arranged on the side of the coating slip. In the illustrated case, this grater is a rotationally symmetrical body 10a, which is pressed against the paper web coated with coating slip with a certain pressure. This roller is rotatably supported and is driven. It rotates about its own axis in the direction of the paper web or in the opposite direction and, due to a further drive, which is not shown in detail here, performs oscillating movements transversely to the paper web.
The paper web is then fed to further working devices via a deflecting element, shown here as deflecting roller 11a.

Insgesamt können mit dieser Ausführung 11 Antriebsmöglichkeiten entsprochen werden. Dabei sind die Hauptunterscheidungsmerkmale die Rotationsrichtung in Bezug auf die Laufrichtung der Papierbahn und die Relativgeschwindigkeit zwischen Walzenumlauf und Papierbahngeschwindigkeit.A total of 11 drive options can be met with this version. The main distinguishing features are the direction of rotation in relation to the running direction of the paper web and the relative speed between the roller circulation and the paper web speed.

Rotiert die Walze in Bahnlaufrichtung und die Relativgeschwindigkeit zwischen Walzenumlauf und Papierbahn ist gleich null, kann ein Verreibeeffekt nur gewährleistet werden, wenn die Walze

  • 1) oszillierende Bewegungen längs zur Papierbahn,
  • 2) oszillierende Bewegungen quer zur Papierbahn ,
  • 3) eine Kombination aus Quer- und Längsbewegung gegenüber der Papierbahn ausführt.
If the roller rotates in the direction of web travel and the relative speed between roller circulation and paper web is zero, a rubbing effect can only be guaranteed if the roller
  • 1) oscillating movements along the paper web,
  • 2) oscillating movements across the paper web,
  • 3) performs a combination of transverse and longitudinal movement with respect to the paper web.

Ist die Umlaufgeschwindigkeit der Walze ungleich der Papierbahngeschwindigkeit, d.h. die Relativgeschwindigkeit zwischen Walzenumlauf und Papierbahn ist ungleich null, wird der entsprechende Verreibeeffekt schon durch die Rotationsbewegung der Walze erreicht. Durch die zusätzliche Oszillation wird er verstärkt. Eine Überlagerung von Walzenrotation und zusätzlicher oszillierender Bewegung zur Papierbahn ermöglicht ein Verreiben in Lauf- und quer zur Laufrichtung der Papierbahn, während die alleinige Rotation der Walze vordergründig ein Verreiben in Laufrichtung der Papierbahn begünstigen wird. Zusammengefaßt ergeben sich folgende Möglichkeiten bei Rotation einer Walze in Papierbahnlaufrichtung und Vorhandensein einer Relativgeschwindigkeit zwischen Walzenumlauf und Papiergeschwindigkeit:

  • 1) die Walze führt nur eine reine Rotationsbewegung aus,
  • 2) die Walze führt zusätzlich oszillierende Bewegungen quer zur Papierbahn aus,
  • 3) die Walze führt zusätzlich eine oszillierende Bewegung in Papierbahnlaufrichtung aus,
  • 4) die Walze führt eine Kombination von Längs- und Querbewegung in Bezug auf die Papierbahn aus.
If the rotational speed of the roller is not equal to the speed of the paper web, ie the relative speed between the roller circulation and the paper web is not equal to zero, the corresponding rubbing effect is already achieved by the rotational movement of the roller. It is amplified by the additional oscillation. A superposition of roller rotation and additional oscillating movement to the paper web enables rubbing in the running and transverse to the running direction of the paper web, while the sole rotation of the roller will primarily promote rubbing in the running direction of the paper web. In summary, there are The following options for the rotation of a roller in the direction of the paper web and the presence of a relative speed between the roller circulation and the paper speed:
  • 1) the roller only performs a pure rotational movement,
  • 2) the roller also performs oscillating movements transversely to the paper web,
  • 3) the roller also performs an oscillating movement in the direction of the paper web,
  • 4) the roller performs a combination of longitudinal and transverse movement with respect to the paper web.

Rotiert die Walze gegenläufig zur Laufrichtung der Papierbahn, kann ein Verreibeeffekt allein durch die Walzenrotation erreicht werden, allerdings nur längs zur Papierbahnlaufrichtung. Die zusätzliche Oszillation der Walze quer zur Papierbahnlaufrichtung begünstigt den Verreibeeffekt. Oszillierende Bewegungen längs zur Papierbahnlaufrichtung und eine Kombination aus Längs- und Querbewegung gegenüber der Papierbahn sind möglich.If the roller rotates in the opposite direction to the running direction of the paper web, a rubbing effect can only be achieved by the rotation of the roller, but only along the direction of the paper web running. The additional oscillation of the roller transverse to the paper web direction favors the rubbing effect. Oscillating movements along the direction of the paper web and a combination of longitudinal and transverse movements with respect to the paper web are possible.

Im Normalfall wird die Walze angetrieben, und zwar in Bezug auf die Papierbahn entweder gleichläufig oder gegenläufig. Die hierbei notwendige Relativgeschwindigkeit wird auf einen optimalen Wert eingestellt.The roller is normally driven, either in the same direction or in opposite directions with respect to the paper web. The relative speed required here is set to an optimal value.

Ist die Walze drehbar gelagert und wird nicht angetrieben, kann sie von der Papierbahn durch deren Geschwindigkeit mitgenommen werden. Es ist dann zur Erzielung des Verreibeeffektes eine Einrichtung notwendig, die die Walze abbremst. Zusätzlich ist es auch hier zweckmäßig, die Walze oszillierende Bewegungen quer zur Papierbahnlaufrichtung ausführen zu lassen, um einen guten Verreibeeffekt über die gesamte Papierbahnebene zu gewährleisten.If the roller is rotatably supported and is not driven, it can be taken along by the paper web due to its speed. A device that brakes the roller is then necessary in order to achieve the rubbing effect. In addition, it is also expedient here to have the roller perform oscillating movements transverse to the direction of the paper web in order to ensure a good rubbing effect over the entire plane of the paper web.

Die Oberfläche der Walze kann glatt oder als Profil ausgeführt sein. Eine weitere Möglichkeit ist eine drahtumwickelte Walze. Glatte Walzen sind vorzugsweise mit einem Cr-Bezug oder Streichfarbe abweisenden und verschleißfesten Beschichtungen versehen, wie z. B. Teflon, Gummi, Polyurethan oder Keramik. Der Walzendurchmesser beträgt vorzugsweise 100 bis 400 mm.The surface of the roller can be smooth or designed as a profile. Another option is a wire-wrapped roller. Smooth rollers are preferably provided with a Cr cover or paint repellent and wear-resistant coatings, such as. B. Teflon, rubber, polyurethane or ceramic. The roller diameter is preferably 100 to 400 mm.

Die Figur 11 zeigt analog zu Figur 10 eine Zwei-Walzen-Presse. Eine Walze 1 und eine Walze 2, die achsparallel zueinander angeordnet und drehbar gelagert sind und miteinander einen Walzenspalt 3 zum Hindurchführen einer Papierbahn 4 bilden. Die beiden Walzen sind gegenläufig zueinander angetrieben. Seitlich neben dem von unten nach oben laufenden Teil des Walzenumfanges jeder Walze 1, 2 ist eine Auftragseinheit 5, 6 für ein fließfähiges Medium angeordnet. Die Papierbahn 4 wird von oben nach unten durch den Walzenspalt 3 geführt. Dabei wird in den Bereichen 7, 8 die der Walzenspalt mit der Papierbahn bildet, ein Film fließfähigen Mediums auf die Papierbahn aufgebracht. Beide Auftragseinrichtungen bringen Streichfarbe auf die Oberfläche der Walze auf. Durch das Führen der Papierbahn von oben nach unten durch den Walzenspalt wird die Streichmasse in der gewünschten Dicke auf die Papierbahn aufgetragen. Im anschließenden freien Zug 9 der Papierbahn sind auf beiden Seiten zum Verreiben der Streichmasse je ein Verreibeorgan angeordnet. Diese Verreibeorgane, im dargestellten Fall rotationssymmetrische Körper 10a, sind in der Figur ein Stab. Die Oberfläche des Stabes kann dabei glatt sein, der Durchmesser beträgt vorzugsweise 10 - 30 mm. Es besteht auch die Möglichkeit, den Stab mit Draht zu umwickeln oder seiner Oberfläche ein Profil zu geben.FIG. 11 shows a two-roll press analogous to FIG. 10. A roller 1 and a roller 2, which are arranged axially parallel to one another and rotatably mounted and together form a roller nip 3 for passing a paper web 4. The two rollers are driven in opposite directions to each other. An application unit 5, 6 for a flowable medium is arranged laterally next to the part of the roller circumference of each roller 1, 2 which runs from bottom to top. The paper web 4 is guided from top to bottom through the nip 3. A film of flowable medium is applied to the paper web in the areas 7, 8 which the nip forms with the paper web. Both application devices apply coating color to the surface of the roller. By guiding the paper web from top to bottom through the nip, the coating slip is applied to the paper web in the desired thickness. In the subsequent free train 9 of the paper web, a grater is arranged on both sides for rubbing the coating slip. These distribution elements, in the case shown rotationally symmetrical bodies 10a, are a rod in the figure. The surface of the rod can be smooth, the diameter is preferably 10-30 mm. It is also possible to wrap the rod with wire or to give its surface a profile.

Der Stab selbst rotiert nur sehr langsam zum Zwecke der Selbstreinigung und zur Vermeidung von lokalem Verschleiß. Um einen guten Verreibeeffekt zu erzielen, sind zusätzliche Antriebsmöglichkeiten, die in der Figur nicht dargestellt sind, zur Realisierung oszillierender Bewegungen um die Stabachse sowie längs in oder quer zur Papierbahnlaufrichtung oder einer Kombination aus Längs- und Querbewegung relativ zur Papierbahn, vorzusehen.The rod itself rotates very slowly for the purpose of self-cleaning and to avoid local wear. In order to achieve a good rubbing effect, there are additional drive options that are not shown in the figure are to be provided for the realization of oscillating movements around the rod axis as well as longitudinally in or transverse to the direction of the paper web or a combination of longitudinal and transverse movements relative to the paper web.

Möglich ist in diesem Ausführungsbeispiel auch der Einsatz von Walzen beidseitig der Papierbahn. Die Ausführung und Gestaltung der Antriebsmöglichkeiten erfolgt wie in Figur 1 beschrieben.In this embodiment it is also possible to use rollers on both sides of the paper web. The execution and design of the drive options is as described in Figure 1.

Vorzugsweise werden die Verreibeorgane beidseitig der Papierbahn so angeordnet, daß sie in Laufrichtung gegeneinander versetzt sind.The distribution elements are preferably arranged on both sides of the paper web so that they are offset from one another in the running direction.

Die Papierbahn 4 wird nach den Verreibeorganen über eine Umlenkeinrichtung, hier eine Umlenkwalze 11a, weitergeleitet. Es besteht dabei auch die Möglichkeit, um den Kontakt einer noch nassen bzw. feuchten, gestrichenen Papierbahn mit der Umlenkwalze 11a zu vermeiden, einen Trocknungsvorgang zwischen Umlenkwalze und Verreibeorgan vorzusehen.The paper web 4 is passed on to the distribution elements via a deflection device, here a deflection roller 11a. There is also the possibility, in order to avoid the contact of a still wet or damp, coated paper web with the deflecting roller 11a, to provide a drying process between the deflecting roller and the grater.

Figur 12 gibt die bereits in Figur 10 beschriebene 2-Walzen-Pressen-Anordnung in abgewandelter Form wieder. Uber zwei achsparallele, drehbar gelagerte Walzen 1 und 2, die gegenläufig zueinander angetrieben sind und miteinander einen Walzenspalt 3 bilden, wird Streichfarbe durch zwei Zuführeinrichtungen 5 und 6, wobei je eine einer Walze zugeordnet ist, auf die Oberfläche der Walzen aufgetragen und beim Durchführen der Papierbahn 4 durch den Walzenspalt 3 auf die Papierbahn aufgebracht. Im offenen Zug sind auch hier beidseitig Verreibeorgane 10a angeordnet. Diese können wie in Figur 10 oder in Figur 11 beschrieben ausgeführt sein. Analog dazu sind auch die Antriebsmöglichkeiten wie in den bereits beschriebenen Figuren realisierbar.FIG. 12 shows the 2-roll press arrangement already described in FIG. 10 in a modified form. About two axially parallel, rotatably mounted rollers 1 and 2, which are driven in opposite directions to each other and form a nip 3, coating color is applied to the surface of the rollers by two feed devices 5 and 6, one assigned to each roller, and when performing the Paper web 4 applied through the nip 3 to the paper web. In the open train, grating members 10a are also arranged on both sides here. These can be designed as described in FIG. 10 or in FIG. 11. Analogously to this, the drive options as in the figures already described can also be implemented.

Die Umlenkung der Papierbahn erfolgt hier kontaktlos über eine Luftkissenumlenkeinrichtung llb. Das hat den Vorteil, daß auch noch von der Streichfarbe feuchte Papierbahnen einer Umlenkung ohne direkte Berührung der noch von Streichfarbe feuchten Papierbahnseite mit einem Umlenkorgan erfahren kann und eine vorhergehende Zwischentrocknung nicht erforderlich ist. Die Papierbahn wird anschließend mittels einer Infrarot-Einrichtung 12a getrocknet. Eine weitere Möglichkeit der nachfolgenden Trocknung ist in Figur 12b dargestellt und besteht darin, die Papierbahn nach der Infrarot-Trocknung 12a noch einer Schwebetrocknung 12b zu unterziehen.The deflection of the paper web takes place here contactlessly via an air cushion deflection device 11b. This has the advantage that even paper webs still damp from the coating color can be deflected without directly contacting the paper web side still wet from coating color with a deflecting element, and prior intermediate drying is not necessary. The paper web is then dried by means of an infrared device 12a. A further possibility for the subsequent drying is shown in FIG. 12b and consists in subjecting the paper web to a floating drying 12b after the infrared drying 12a.

Die in Figur 13 dargestellte 2-Walzen-Pressen-Anordnung entspricht im Aufbau und der Funktion im wesentlichen der in Figur 10 beschriebenen Anordnung. Die Bezugszeichen sind entsprechend zugeordnet. Als Verreibeorgane werden Stäbe mit in ihrer Seitenansicht konvexer Arbeitsfläche 10b, hier als Hydrobarschuhe ausgeführt, eingesetzt.The two-roll press arrangement shown in FIG. 13 corresponds in structure and function essentially to the arrangement described in FIG. The reference symbols are assigned accordingly. Rods with a work surface 10b which is convex in their side view, here designed as hydrobar shoes, are used as the distribution elements.

Der Krümmungsradius der Arbeitsfläche des Stabes 10b wird vorzugsweise größer gewählt als der Radius dafür eingesetzter Walzen, so daß die wirksame Arbeitsfläche des Verreibeorganes sich größer gestaltet.The radius of curvature of the working surface of the rod 10b is preferably chosen to be larger than the radius of the rollers used for it, so that the effective working surface of the grater is larger.

Die Hydrobarschuhe können stationär oder mit einem zusätzlichen Antrieb zur Realisierung von oszillierenden Bewegungen quer zur Papierbahn, der in der Figur nicht dargestellt ist, ausgestattet sein.The hydrobar shoes can be stationary or equipped with an additional drive for realizing oscillating movements transverse to the paper web, which is not shown in the figure.

Die Oberfläche des Hydrobarschuhs kann glatt sein oder mit einem Profil versehen werden, wie in den Figuren 14 und 15 verdeutlicht. Vorzugsweise wird das Profil sich nicht über die gesamte Oberfläche des Hydrobarschuhs erstrecken, sondern nur über den ersten ansteigenden Krümmungsteil in Laufrichtung der Papierbahn. Der folgende absteigende Teil wird glatt ausgeführt. Damit wird erreicht, daß die Deckschicht aus Streichmasse mit ihren Unebenheiten aufgerauht und anschließend gleichmäßig verrieben wird. Die Papierbahn wird dann über ein Umlenkorgan 11 z. B. nachfolgenden Trocknungseinrichtungen zugeführt.The surface of the hydrobar shoe can be smooth or can be provided with a profile, as illustrated in FIGS. 14 and 15. The profile will preferably not extend over the entire surface of the hydrobar shoe, but only over the first rising part of the curve in the running direction of the paper web. The following descending part is executed smoothly. This ensures that the top layer roughened with a bump and then rubbed evenly. The paper web is then z. B. supplied subsequent drying facilities.

In den Figuren 14a, 14b und 14c sind Möglichkeiten für die Profilgestaltung dargestellt. Das in Fig. 14a dargestellte Profil der Arbeitsfläche ist wellig. Die Figuren 14b und 14c verdeutlichen die Möglichkeit der Verwendund eines Zahn- und eines Zahnstangenprofils.14a, 14b and 14c show possibilities for the profile design. The profile of the work surface shown in FIG. 14a is wavy. Figures 14b and 14c illustrate the possibility of using and a rack and a rack profile.

Die Figuren 15a, 15b und 15c geben einen Überblick über mögliche Profilkonturen in der Draufsicht. Dabei sind parallele Profilkonturen, Profilkonturen mit einer Steigung und Profilkonturen mit wechselnder Steigung denkbar.FIGS. 15a, 15b and 15c provide an overview of possible profile contours in a top view. Parallel profile contours, profile contours with a pitch and profile contours with changing pitch are conceivable.

Die Auswahl der einzusetzenden Verreibeorgane, deren Anzahl, d.h. die Möglichkeit eines Hintereinanderschaltens von Verreibeorganen auf der gleichen Papierbahnseite und der Antriebsmöglichkeiten erfolgt für einen konkreten Einsatzfall und den zu erzielenden Effekt.The selection of the distribution organs to be used, their number, i.e. the possibility of connecting distribution elements in series on the same paper web side and the drive options are provided for a specific application and the effect to be achieved.

Claims (19)

  1. Process for coating a paper web of low strength (waste paper base), comprising the following features:
    1.1 the paper is coated on both sides;
    1.2 the paper web is dried after coating;
    characterised by the following features:
    1.3 the coating on each of the two sides is applied by means of two or more single coating stations;
    1.4 only a portion of the total coating volume is applied by a single coating station, and at the end of the entire coating process the portions of these individual coating volumes add up to the total coating volume;
    1.5 the paper web is dried after each application of a partial coating volume;
    1.6 coating is carried out indirectly in at least one coating station in that the coating paint is initially applied to the coating surface of a rotating roller and transferred from there onto the paper web;
    1.7 coating paint of identical composition is used in all single coating stations;
  2. Process according to Claim 1, characterised by the following features:
    2.1 initially, the total coating volume intended for the one side of the paper web is applied thereto;
    2.2 then the paper web is dried;
    2.3 then the total coating volume intended for the other side of the paper web is applied thereto;
    2.4 then the paper web is dried again.
  3. Process according to one of Claims 1 to 2, characterised in that the coating volume per side is 0.5 and 12 g/m2.
  4. Process according to one of Claims 1 to 3, characterised in that the paper web does not at any time during the entire coating process go below a dry content of approximately 70% relative to the joined weight of paper web and coating.
  5. Device for carrying out one of the processes according to one of Claims 1 to 4, comprising the following features:
    5.1 with at least one coating station (1, 2) for indirect coating;
    5.2 and at least one coating station includes two rollers each which are arranged parallel to each other with a roller gap for passing through a paper web, furthermore at least one application nozzle (1.1, 1.2) for apportioned application of a coating paint layer onto the casing surface of the one roller for the purpose of transferring this coating from roller casing to paper web in the roller gap;
    5.3 with at least one drying device;
    characterised by the following features:
    5.4 a plurality of coating stations (1, 2) is provided;
    5.5 the single coating station (1, 2) is designed and arranged in such a manner that only a partial quantity of the total coating volume is applied;
    5.6 each coating station (1, 2) has a drying unit downstream;
    5.7 each coating station is only a single coating station with only one application nozzle.
  6. Device according to Claim 5, characterised in that on at least one side of the paper web beyond the roller gap in the free pull (9) is provided a distributing element (10a, 10b, 20.1, 20.2, 20.3, 20.4, 20.5, 20.6) which essentially extends over the entire width of the paper web.
  7. Device according to one of Claims 5 to 6, characterised in that both coating stations apply coating paint onto the casing surfaces of their associated rollers, and distributing elements (10a, 10b) are placed on both sides of the paper web.
  8. Device according to Claim 7, characterised in that the distributing elements (10a, 10b) are arranged tangentially on both sides on a common perpendicular on the paper web (4).
  9. Device according to Claim 7 and/or 8, characterised in that the distributing elements (10a, 10b) are arranged on both sides of the paper web offset relative to each other in the movement direction.
  10. Device according to one of Claims 7 to 9, characterised in that the distributing element is in the shape of a rotation-symmetrical body (10a).
  11. Device according to Claim 10, characterised in that the rotation-symmetrical body (10a) is rotatably mounted.
  12. Device according to Claim 11, characterised in that the rotation-symmetrical body (10a) is driven.
  13. Device according to Claim 11 and/or 12, characterised in that the rotary speed of the rotation-symmetrical body differs from the paper speed.
  14. Device according to Claim 10, characterised in that the rotation-symmetrical body (10a) rotates in opposition to the movement direction of the paper web.
  15. Device for coating flowable media according to one of Claims 7 to 14, characterised in that the distributing element is designed as a rod with convex working surface (10b), as seen from the side.
  16. Device according to one of Claims 7 to 15, characterised in that the individual distributing element oscillates around its own axis.
  17. Device according to one of Claims 7 to 16, characterised in that the individual distributing element (10a, 10b) operates with oscillation transversely and/or along the paper web.
  18. Device according to one of Claims 7 to 17, characterised in that the working surface of the individual distributing element (10a, 10b) is smooth.
  19. Device according to one of Claims 7 to 18, characterised in that the working surface of the individual distributing element (10a, 10b) is essentially profiled.
EP93112694A 1993-01-29 1993-08-07 Method and apparatus for coating a paper web Expired - Lifetime EP0609483B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP97100214A EP0784120A3 (en) 1993-01-29 1993-08-07 Method and apparatus for coating a paper web

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19934302435 DE4302435A1 (en) 1993-01-29 1993-01-29 Paper web coating appts. - has smoother against side of web in free path after leaving gap between applicator rollers
DE4302437 1993-01-29
DE19934302437 DE4302437A1 (en) 1993-01-29 1993-01-29 Paper web coating for low strength recycled paper material - by applying part of coating vol. at station with drying between stations, for strengthening
DE4302435 1993-01-29

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP97100214A Division EP0784120A3 (en) 1993-01-29 1993-08-07 Method and apparatus for coating a paper web
EP97100214.2 Division-Into 1997-01-09

Publications (2)

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EP0609483A1 EP0609483A1 (en) 1994-08-10
EP0609483B1 true EP0609483B1 (en) 1997-07-23

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EP93112694A Expired - Lifetime EP0609483B1 (en) 1993-01-29 1993-08-07 Method and apparatus for coating a paper web
EP97100214A Withdrawn EP0784120A3 (en) 1993-01-29 1993-08-07 Method and apparatus for coating a paper web

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP97100214A Withdrawn EP0784120A3 (en) 1993-01-29 1993-08-07 Method and apparatus for coating a paper web

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EP (2) EP0609483B1 (en)
JP (1) JPH07505573A (en)
AT (1) ATE155839T1 (en)
CA (1) CA2133311A1 (en)
DE (1) DE59306972D1 (en)
FI (1) FI99155B (en)
WO (1) WO1994017244A1 (en)

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US5944898A (en) * 1996-06-13 1999-08-31 Voith Sulzer Papiermaschinen Gmbh Apparatus for successive application of two coats of liquid or pasty medium on one side of a traveling web of material

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FI96338C (en) * 1994-04-19 1996-06-10 Valmet Corp Method and apparatus for double-sided coating of a printing paper web
DE4415581C2 (en) * 1994-05-04 1995-12-07 Voith Gmbh J M Paper coating device
ITMI20010265A1 (en) * 2001-02-09 2002-08-09 Ind Cartarie Tronchetti Spa APPARATUS AND METHOD FOR APPLYING A FLUID TO A PAPER TAPE
FI119564B (en) † 2001-03-09 2008-12-31 Metso Paper Inc Procedure and arrangement for the production of printing paper
FI20031362A (en) * 2003-09-22 2005-03-24 Metso Paper Inc A process for making a surface-glued paper or paperboard web
JP5684965B2 (en) * 2005-06-20 2015-03-18 大王製紙株式会社 Manufacturing method of coated paper
JP5300179B2 (en) 2006-05-02 2013-09-25 大王製紙株式会社 Production equipment and production method for coated paper
FI121479B (en) * 2008-02-29 2010-11-30 Metso Paper Inc Method and apparatus for making paper coated with multiple coating layers
CN104492660A (en) * 2014-12-30 2015-04-08 松德机械股份有限公司 Double-faced coating all-in-one machine and coating method thereof
CN105133428A (en) * 2015-09-06 2015-12-09 安徽金亿禾特种纸有限公司 Feeding device for producing paper

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US5944898A (en) * 1996-06-13 1999-08-31 Voith Sulzer Papiermaschinen Gmbh Apparatus for successive application of two coats of liquid or pasty medium on one side of a traveling web of material

Also Published As

Publication number Publication date
FI944496A0 (en) 1994-09-28
WO1994017244A1 (en) 1994-08-04
EP0784120A3 (en) 2004-04-14
ATE155839T1 (en) 1997-08-15
EP0609483A1 (en) 1994-08-10
CA2133311A1 (en) 1994-07-30
EP0784120A2 (en) 1997-07-16
JPH07505573A (en) 1995-06-22
FI99155B (en) 1997-06-30
FI944496A (en) 1994-09-28
DE59306972D1 (en) 1997-08-28

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