EP2425056B1 - Arrangement and method for processing a paper web, in particular a cigarette paper web - Google Patents

Arrangement and method for processing a paper web, in particular a cigarette paper web Download PDF

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Publication number
EP2425056B1
EP2425056B1 EP10719264.3A EP10719264A EP2425056B1 EP 2425056 B1 EP2425056 B1 EP 2425056B1 EP 10719264 A EP10719264 A EP 10719264A EP 2425056 B1 EP2425056 B1 EP 2425056B1
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EP
European Patent Office
Prior art keywords
paper web
drying
roller
print medium
rollers
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.)
Active
Application number
EP10719264.3A
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German (de)
French (fr)
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EP2425056A1 (en
Inventor
Franz Burger
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.)
Delfortgroup AG
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Delfortgroup AG
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Filing date
Publication date
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Priority to PL10719264T priority Critical patent/PL2425056T3/en
Publication of EP2425056A1 publication Critical patent/EP2425056A1/en
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Publication of EP2425056B1 publication Critical patent/EP2425056B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24C—MACHINES FOR MAKING CIGARS OR CIGARETTES
    • A24C5/00—Making cigarettes; Making tipping materials for, or attaching filters or mouthpieces to, cigars or cigarettes
    • A24C5/38—Machines combined with printing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/006—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/08—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces
    • B41F17/14—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length
    • B41F17/16—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces on articles of finite length on end or bottom surfaces thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/24—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles
    • B41F17/26—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles by rolling contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/30—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on curved surfaces of essentially spherical, or part-spherical, articles
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/02—Mechanical driving arrangements
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G7/00—Damping devices

Definitions

  • the invention relates to a system and a method for processing a paper web having an areal density of no more than 70 or 60 g / m 2, in particular of not more than 50g / m 2, in particular a cigarette paper web.
  • a paper web having an areal density of no more than 70 or 60 g / m 2, in particular of not more than 50g / m 2, in particular a cigarette paper web for example, a web for cigarette paper with a surface density of 20 to 40 g / cm 2 can be used.
  • the cigarette paper contains a filler, especially calcium carbonate.
  • the inventors of the subject of the application have recognized that residual stresses and changes in extensibility of the paper in the course of the paper web between printed and unprinted areas, ie between areas of starch solution strips and starch-free areas, occur which stresses even strike folds in the cigarette paper.
  • the wrinkling of the cigarette paper is on the one hand a problem in the further processing of the cigarette papers, on the other hand is accompanied by an optical deficit, which may affect the acceptance of the manufactured from this paper smoking article in the consumer and thus may be of economic disadvantage.
  • the printed cigarette paper is usually cut after its starch solution treatment in a cutting station.
  • the maximum throughput of the cigarette paper manufacturing process is just limited by the cutting station, with only very low conveying speeds of only about 50 m / min may be driven.
  • JP 07-229095 A relate to the production of single-sided coated paper webs.
  • JP 05-272087 A relates to a coating control for controlling the position of a idler roll.
  • WO 2007/046124 A1 relates to methods and apparatus for making tissue paper.
  • US 2002/0129824 A1 discloses a plant or a method according to the preamble of claim 1 or 15.
  • a plant for processing a cigarette paper web with an areal density of at most 60 or 70g / m 2 , in particular of at most 50g / m 2 which plant has an input side through which the paper web of the system can be fed. Furthermore, the installation has an exit side, via which the paper web leaves the installation, wherein the paper web passes through the installation from the entry side to the exit side in a conveying direction, in particular continuously, preferably with a substantially constant conveying speed.
  • the input side is a device in particular a printing unit, preferably a gravure printing unit, arranged downstream, which is a liquid printing medium, such as a starch solution in particular to form a corona, on the paper web, namely only on one side of the paper web, apply.
  • a printing unit preferably a gravure printing unit, arranged downstream, which is a liquid printing medium, such as a starch solution in particular to form a corona, on the paper web, namely only on one side of the paper web, apply.
  • a first drying station in particular a hot air drying, to which should dry the applied to the paper web pressure medium.
  • the paper web would become due to structural changes and distortions of the paper and associated changes in mechanical properties, such as ductility of the paper, especially in the transition region of paper-free and print medium-containing paper sections weakened, which is visually noticeable by wrinkles at the transition region of the paper.
  • the invention proposes, after the first drying, a device for moistening the paper web, which now contains the dried printing medium, wherein the moistening device is also followed in the conveying direction by a second drying station, through which the moistened paper web is to be dried again.
  • the applicator may include a printing technique such as gravure printing.
  • An alternative application technique, such as a film press technique, is also conceivable.
  • the printed cigarette paper which usually suffers from wrinkling, should be smoothed by complete moistening and subsequent drying.
  • even more complex image structures, such as image marks, etc. can be printed on paper without unwanted wrinkles forming.
  • the second drying station is realized by contact drying, in which the moistened paper web is in direct contact with at least one heated drying cylinder or roller, preferably three or four drying cylinders.
  • heat is transferred to the paper web by contact with the drying cylinders to obtain the dehumidification of the paper web and thus the drying of the paper web.
  • the paper web is tensioned within the drying station in such a way that the paper web rests close to the drying cylinders, whereby a simultaneous drying and smoothing is achieved.
  • the printing unit is adapted to print on the paper web a printing pattern having alternating regions free of printing medium and printing medium.
  • a stripe pattern can be provided.
  • the pressure medium is an aqueous solution, preferably a starch solution, an emulsion or a suspension.
  • the printing unit is designed as a gravure printing unit and has a impression roller and a pressure cylinder cooperating with the impression roller according to pressure.
  • the printing cylinder may be associated with a receiving the pressure medium trough so that when rotating the printing cylinder is wetted with the liquid printing medium to apply the printing medium as it passes through the paper web through a pressure contact point between the impression cylinder and the impression roller on the paper web.
  • the tub can consist of two Tub sections exist, namely an inner tub and an outer tub. Depending on the diameter of the impression cylinder, work is done with the inner tub or without the inner tub.
  • the inner tub has a smaller volume or smaller dimensions compared to the outer tub. When using small diameter pressure cylinders, it is advantageous to use the smaller inner tub. As a result, a better Schöpf the cylinder is achieved. For cylinders with a circumference of about 750mm, the inner tub is too small.
  • the printing cylinder has an outer circumference of 400 to 1200 mm.
  • the hot-air drying takes place without contact with respect to a printed side of the paper web.
  • This may mean that the hot-air drying conveyor rollers, which are also in direct contact with the paper web, but the conveyor rollers should fulfill no drying function, but only perform a conveying function and are only in contact with the unprinted side of the paper web.
  • the transport of the paper by the hot air drying can also be done via a support screen. This sieve is driven by conveyor rollers. The screen is in direct contact with the paper but never in contact with the printed side of the paper.
  • the hot air drying may be formed by a flow around the paper web, wherein the circulating air flow should have a temperature of not more than 240 ° C.
  • the moistening device is designed to moisten the entire paper web as it passes through the moistening device. This may mean that the moistening device realizes irrigation or wetting of the paper web along its entire width when passing through the moistening device, wherein all sections of the paper web are moistened accordingly in the conveying of the paper web in its longitudinal direction, in particular on one or both sides.
  • the moistening device wets the paper web with an impregnating liquid, which may have a temperature of 15 ° to 75 ° C.
  • the moistening device forms a sump of impregnating liquid, through which sump the paper web is guided or drawn through for wetting it.
  • the moistening device has two rollers that are rotatably mounted so that they can be pressed against each other.
  • a sump of the impregnating liquid can be formed at the press contact region of the two rolls.
  • the rollers should be pressed together with a pressure of at most 3.5 bar.
  • the moistening device for forming the sump of the impregnating liquid has a pump which can convey the impregnating liquid into the press contact region of the two rollers.
  • a hose line can be connected to the pump, which leads the pumped impregnating liquid towards the press contact region of the two rollers.
  • a periphery of the at least one roller is provided with a coating material, such as ceramic or polytetrafluoroethylene.
  • a coating material such as ceramic or polytetrafluoroethylene.
  • Other coating materials can be used, which in particular have a low frictional resistance, a homogeneous surface structure, an extreme temperature resistance and a good chemical resistance and are non-adhesive.
  • the moistening device consists of a spraying device for spraying the paper web with the impregnating liquid.
  • the moistening can thus be realized by the impregnating liquid is atomized by nozzles and only in this way reaches the paper web.
  • the spraying device may be provided. The sump humidification and the spray device can be operated independently or simultaneously.
  • the spraying device is arranged downstream of the rollers in the conveying direction, so that, should a sump area be provided at the press contact area of the rollers, the paper web which has already been pre-moistened by the sump can additionally be wetted with liquid by the spraying device, in particular from both sides.
  • the spraying device may be formed by a tube formed with nozzles, which are arranged extending in the width direction of the paper web such that the paper web is completely moistened when it has passed through the moistening device.
  • a control and / or regulating device is provided in the system, which can adjust in particular the spray pressure and / or a spray quantity of the moistening device.
  • the control and / or regulating device can access the nozzles of the pipe in a controlled manner.
  • the moistening device can be designed as a gravure printing unit that completely moistens the paper web.
  • the impregnating liquid is water, an aqueous solution, an emulsion or a suspension of water-soluble or water-insoluble inorganic or organic compounds.
  • the aqueous solution may have salts, in particular citrates, for adjusting the rate of simmering.
  • the amount of water applied is at least 10% of the dry pulp.
  • the applied volume fraction is between 25% and 50%. It is also possible to apply a water quantity of 100%.
  • As a basic rule when adjusting the amount of impregnating liquid to be applied it can be stated that the greater the amount of the printing medium applied in the first station, the stronger the paper web is to moisten with the impregnating liquid.
  • as impregnating liquid or moistening liquid to use water which may have a temperature between 10 ° and 80 °.
  • the temperature for the water is about 25 ° C to 40 ° C.
  • At least one drying cylinder in particular at the first drying cylinder in the conveying direction, a hot air dryer hood is provided which at least partially surrounds the drying cylinder, that the paper web is exposed to the drying cylinder a hot air drying current, guided from the inside of the hood.
  • a peripheral wall of the drying cylinder, on which rests the paper web have a temperature of at least about 60 ° C and at most about 180 ° C.
  • the at least one drying roller is cylindrical and in particular has a cylindrical contact outer surface.
  • the drying of the moistened paper web takes place around the cylindrical contact outer surface, in that it bears in a contacting manner in a peripheral region on the cylindrical contact outer surface.
  • the peripheral area, which is occupied by the paper web is preferably greater than 90 °, 100 °, 110 ° or 120 °, in particular at least for a drying roller greater than 180 °.
  • the cylindrical contact outer surface is smooth and free of elevation. In this way, an ironing effect of the moistened paper web is achieved. It is ensured that a full-surface contact of the paper web along the entire width is realized within the so-called peripheral area.
  • the contact outer surface is consequently profile-free.
  • At least three drying rollers are provided, which are arranged offset in a vertical height direction.
  • the first and last drying roller can be at the same horizontal height.
  • the horizontally adjacent drying rollers can partially overlap seen in the height direction, so that the paper web runs back in the conveying direction after delivery of a first drying roller on the second drying roller and from the second drying roller to the third drying roller opposite to the conveying direction.
  • an at least cylindrical drying roll has a diameter of at least 80 cm, preferably less than 2.5 m, with a preferred diameter size being 1.8 m.
  • the at least one drying roller comprises a particularly closed inner cavity, which can be filled with steam or hot air to heat the drying roller. Alternatively, the drying roller can be heated by infrared radiation.
  • a particular aspect of the invention is to provide a predetermined temperature profile at the at least two drying rollers.
  • the temperatures on the outside of the drying cylinder should not exceed 150 °, otherwise it may lead to discoloration of the paper web. However, to achieve a sufficient drying effect, a minimum temperature of 60 ° C should be set.
  • a take-up roll is provided on the output side, which is rotationally driven so that the paper web is biased at least during their transport through the second drying station.
  • a take-off roll can be arranged with a wound paper web on the input side, can be compensated in the tension and / or irregularities on the unwound rolling roller by a spring-loaded pendulum system.
  • the pendulum system may also preferably be biased by compressed air and regulated for a corresponding pendulum motion.
  • the invention also relates to a method for processing a cigarette paper web having a surface density of 60 or 70 g / m 2 , in particular of at most 50 g / m 2 , wherein, in particular on a printing unit, in particular gravure printing, a liquid medium, such as a printing medium , is applied to the paper web. Subsequently, the pressure medium applied to the paper web is dried at a first drying station, in particular at a hot-air drying. Subsequently, the paper web is moistened with a liquid impregnating medium and the moistened paper web is dried at a second drying station.
  • the inventive system for processing a cigarette paper web 2 having a surface density of 24g / m 2 to 32g / m 2 is provided generally by the reference numeral.
  • the paper processing installation 1 comprises the following essential main stations required: a unwinding station 3, a gravure printing unit 5, a hot air dryer 7, a moistening device 9, a contact dryer 11 and a reeling station 13.
  • the unwind station 3 comprises a sleeve (not shown in detail) with an inner diameter of about 76 mm, from which the paper web 2 is unrolled.
  • Other inner diameter for the sleeve for example, of about 120 mm, can be used.
  • the sleeve is rotatably mounted or may be mounted on a correspondingly rotated shaft. Alternatively, the roll of paper may be wound on a steel core suspended in a unwinding device of the unwinding station.
  • a pendulum system 17 may be provided directly to the unwinding station 3, which is biased by compressed air to communicate corresponding tensile biases of the paper web 2. As in FIG. 2 is shown, the pendulum system 17 is part of the gravure printing unit. 5
  • the paper web 2 is wetted in strips on one side with a desired starch solution by printing a starch solution onto a paper web page by means of the gravure printing process.
  • the operation of the gravure printing unit 5 is based on FIG. 2 explained later.
  • the hot air dryer 7 which has a drying length of about 3.25 m.
  • the hot air dryer 7 is designed to produce a heated circulating air flow at a volume flow rate of 17000 m 3 / h at a maximum temperature of 240 ° C.
  • the hot-air dryer 7 serves to remove possibly introduced with the printing medium in the gravure printing unit 5 solvent.
  • the latter is transported through a felt through the hot air dryer 7 therethrough.
  • the support of the paper also takes place on the non-printed side of the paper, wherein the printed side is not in contact with components of the hot air dryer 7 during the drying process.
  • the transport of the paper web 2 via a conveyor belt, which is formed for example of felt, which is driven by rollers 21.
  • the moistening device 9 has the task of moistening the paper web 2 over its entire width and length with a liquid impregnating medium.
  • a liquid impregnating medium water, an aqueous solution, emulsion or suspension at a temperature of 15 to 75 ° C can be used.
  • the moistening device 9 can form a sump, which is to be formed, for example, in the contact region between two rollers pressed against one another, of which one or both rollers are exposed to the impregnating medium. Through the sump, the paper web 2 is exposed to the impregnating liquid as the paper web 2 is conveyed through the contact area.
  • the moistened paper web 2 is fed to a contact dryer 11, which, as in FIG. 1 can be seen, consists essentially of three drying cylinders or rollers 23, 25 and 27, which have a same diameter.
  • the drying cylinders 23, 25, 27 are charged with steam, in particular steam, and can be heated up to a maximum temperature of 120 ° C.
  • the purpose of the contact dryer 11 is to remove the liquid portion of the impregnating medium fed to the moistening device 9 from the paper web 2.
  • the paper web 2 should be in direct contact with the drying cylinder 23, 25, 27 in order to achieve a desired smoothing effect, so that a completely wrinkle-free paper web 2 is realized.
  • a web guide of the contact drying 11 is preferably designed so that the printed side of the paper only comes into contact with the latter at the second drying cylinder 25.
  • the first drying cylinder 23 is therefore not in contact with the printed side of the paper web 2 but with the opposite one.
  • This embodiment is advantageous in that it does not come to a bonding of the printed substances with the surface of the drying cylinder 23.
  • the drying cylinders 23 to 27 each have a cylindrical contact outer surface, which is contacted by the wetted paper web 2 for the most part contact.
  • the occupied peripheral area of the drying cylinders 23 to 27 is greater than 90 °, 100 ° or 120 °.
  • the circumferential coverage is greater than 180 °.
  • three drying cylinders 23 to 27 are provided, which are offset from each other in the height direction.
  • a horizontal distance of the first 23 and third drying cylinder 27 is set such that it is smaller than the diameter of the (intermediate) drying cylinder 25.
  • the paper web 2 is biased within the drying station 11 to train to plan to apply the contact outer surface of the drying cylinders 23 to 27.
  • the contact dryer 11 is followed by a reeling station 13, which has a support cylinder 31 and a winding roller 33.
  • the function of the support cylinder 31 is to impose the necessary tension of the paper web 2, so that a proper winding of the paper web 2 is ensured at the take-up roller 33.
  • the paper web 2 of an assembly of impression roller 41 and pressure cylinder 43 is supplied, which is wetted with a liquid pressure medium (not shown).
  • the wetting of the printing cylinder 43 is achieved in that the pressure cylinder 43 passes through its own axis during its rotation process a tub which contains the pressure fluid.
  • the trough may be formed by two trough sections, namely an outer trough 45 and an inner trough 47, which has a smaller volume compared to the outer trough.
  • the impression roller 41 builds up the necessary mechanical pressure to allow the printing medium to pass from the impression cylinder 43 to the paper web 2. In addition, the impression roller 41 ensures the transport of the paper web 2 through the gravure printing unit 5 therethrough.
  • a squeegee 59 is provided in the vicinity of the printing cylinder 43 to strip excess printing medium from the printing cylinder 43. The paper web 2 leaves the gravure printing unit 5 to the hot air dryer. 7
  • the wetting device 11 is shown in detail, which consists essentially of two rollers 51, 53 which define a contact pressing region 55, through which the paper web 2 is forced through. Via a pump, not shown, a sump of impregnating liquid is formed in the contact pressing area 55 in order to wet the entire paper web 2 with the impregnating liquid.
  • a spray tube 57 may subsequently be provided, which may be arranged either on one side of the paper web 2 or on both sides (not shown).
  • the spray tube 57 has a plurality of nozzles from which the impregnating liquid is sprayed onto the paper web 2 in order to realize a complete wetting of the paper web 2 with impregnating liquid.
  • the moistened paper web 2 leaves the moistening device 11 for its drying and smoothing treatment in the contact dryer 11.
  • the paper had no wrinkles and the mechanical properties, such as extensibility, of the paper web 2 were markedly improved, so that substantially higher conveying speeds of up to 600 m / min can be achieved in the subsequent cutting systems.
  • the paper printed in the gravure printing method can be further processed as if it were unprinted.

Description

Die Erfindung betrifft eine Anlage bzw. ein Verfahren zum Bearbeiten einer Papierbahn mit einer Flächendichte von höchstens 70 oder 60 g/m2, insbesondere von höchstens 50g/m2, insbesondere einer Zigarettenpapierbahn. Es kann beispielsweise eine Bahn für Zigarettenpapier mit einer Flächendichte von 20 bis 40g/cm2 herangezogen werden. Üblicherweise enthält aus Gründen einer ausreichenden Opazität das Zigarettenpapier einen Füllstoff, insbesondere Kalziumkarbonat.The invention relates to a system and a method for processing a paper web having an areal density of no more than 70 or 60 g / m 2, in particular of not more than 50g / m 2, in particular a cigarette paper web. For example, a web for cigarette paper with a surface density of 20 to 40 g / cm 2 can be used. Usually, for reasons of sufficient opacity, the cigarette paper contains a filler, especially calcium carbonate.

Es besteht insbesondere im Hinblick auf eine Glimm- und Entzündsicherheit ein Bedürfnis der Zigarettenindustrie, das Zigarettenpapier an dessen Oberflächen zu veredeln. Bei einem sogenannten Low Ignition Propensity-(LIP)-Zigarettenpapier sollen klar abgegrenzte Zonen auf dem Zigarettenpapier realisiert werden, um die Luftdurchlässigkeit in diesen Zonen auf ein Maß zu reduzieren, dass eine Zigarette alsbald erlöscht, sobald die Zigarette auf einem festen Untergrund gelegt ist und die Glut eine solche Zone erreicht. Diese Art Glimmschutz wird beispielsweise dadurch realisiert, dass eine Stärkelösung üblicherweise in zur Förderrichtung senkrechten Streifen auf eine Innenseite der Zigarettenpapierbahn aufgebracht wird, nämlich auf der Zigarettenpapierseite, die dem Tabak zugewandt ist. Die Erfinder des Anmeldungsgegenstands haben erkannt, dass Eigenspannungen und Änderungen in der Dehnungsfähigkeit des Papiers im Verlauf der Papierbahn zwischen bedruckten und unbedruckten Bereichen, also zwischen Bereichen mit Stärkelösungsstreifen und stärkelösungsfreien Bereichen, auftreten, welche Spannungen sogar Falten in das Zigarettenpapier schlagen. Die Faltenbildung des Zigarettenpapiers stellt zum einen ein Problem bei der Weiterverarbeitung der Zigarettenpapiere dar, zum anderen geht damit ein optisches Defizit einher, das die Akzeptanz des aus diesem Papier gefertigten Rauchartikels beim Konsumenten beeinträchtigen und damit von wirtschaftlichem Nachteil sein kann. Das bedruckte Zigarettenpapier wird nach dessen Stärkelösungsbehandlung üblicherweise in einer Schneidstation zugeschnitten. Insbesondere aufgrund der wegen der Stärkelösungsstreifen geänderten mechanischen Eigenschaften des Zigarettenpapiers ist die maximale Durchsatzmenge des Zigarettenpapierfertigungsverfahfertigungsverfahrens gerade durch die Schneidstation begrenzt, wobei nur sehr geringe Fördergeschwindigkeiten von nur höchstens etwa 50 m/min gefahren werden dürfen.There is a need of the cigarette industry to refine the cigarette paper on its surfaces, in particular with regard to resistance to smoldering and ignition. In a so-called Low Ignition Propensity (LIP) cigarette paper clearly demarcated zones are to be implemented on the cigarette paper to reduce the air permeability in these zones to a level that ceases immediately once the cigarette is placed on a solid surface and the glow reaches such a zone. This type of anti-corrosive protection is realized, for example, in that a starch solution is usually applied in a direction perpendicular to the conveying direction stripes on an inner side of the cigarette paper web, namely on the cigarette paper side, which faces the tobacco. The inventors of the subject of the application have recognized that residual stresses and changes in extensibility of the paper in the course of the paper web between printed and unprinted areas, ie between areas of starch solution strips and starch-free areas, occur which stresses even strike folds in the cigarette paper. The wrinkling of the cigarette paper is on the one hand a problem in the further processing of the cigarette papers, on the other hand is accompanied by an optical deficit, which may affect the acceptance of the manufactured from this paper smoking article in the consumer and thus may be of economic disadvantage. The printed cigarette paper is usually cut after its starch solution treatment in a cutting station. In particular, due to the changed mechanical properties of the cigarette paper due to the starch solution strips, the maximum throughput of the cigarette paper manufacturing process is just limited by the cutting station, with only very low conveying speeds of only about 50 m / min may be driven.

DE 10 2006 028 420 A1 und JP 07-229095 A betreffen die Herstellung von einseitig beschichteten Papierbahnen. DE 10 2006 028 420 A1 and JP 07-229095 A relate to the production of single-sided coated paper webs.

Vorrichtungen und Verfahren zum Herstellen von Zigarettenpapier mit darauf aufgebrachten Streifen sind von WO 2008/146158 A2 , WO 2004/047572 A1 und EP 0 486 213 A1 bekannt.Devices and methods for producing cigarette paper with strips applied thereto are of WO 2008/146158 A2 . WO 2004/047572 A1 and EP 0 486 213 A1 known.

JP 05-272087 A betrifft eine Beschichtungsregelung zum Regeln der Position einer Losrolle. JP 05-272087 A relates to a coating control for controlling the position of a idler roll.

WO 2007/046124 A1 betrifft Verfahren und Vorrichtungen zum Herstellen von Seidenpapier. US 2002/0129824 A1 offenbart eine Anlage bzw. ein Verfahren gemäß dem Oberbegriff des Anspruchs 1 bzw. 15. WO 2007/046124 A1 relates to methods and apparatus for making tissue paper. US 2002/0129824 A1 discloses a plant or a method according to the preamble of claim 1 or 15.

Es ist Aufgabe der Erfindung, die Nachteile des Stands der Technik zu überwinden, insbesondere eine Anlage sowie ein Verfahren zum Bearbeiten einer Papierbahn mit einer Flächendichte von höchstens 60 oder 70g/m2, insbesondere von höchstens 50 g/m2 zu schaffen, mit welcher Papier in großen Mengen bearbeitbar ist, wobei eine Behandlung des Papiers beispielsweise im Hinblick auf den Glimmschutz zu keiner optischen Verschlechterung des Zigarettenpapiers führt und die mechanischen Eigenschaften eines behandelten Zigarettenpapiers für eine höhere Fertigungsgeschwindigkeit verbessert werden sollen.It is an object of the invention to overcome the disadvantages of the prior art, in particular to provide a plant and a method for processing a paper web having an areal density of at most 60 or 70g / m 2 , in particular of at most 50 g / m 2 , with which Paper is processed in large quantities, wherein a treatment of the paper, for example, with respect to the corona protection to no optical deterioration of the cigarette paper and the mechanical properties of a treated cigarette paper for a higher production speed to be improved.

Diese Aufgabe wird durch die Merkmale des Anspruchs 1 oder 15 gelöst.This object is solved by the features of claim 1 or 15.

Danach ist eine Anlage zum Bearbeiten einer Zigarettenpapierbahn mit einer Flächendichte von höchstens 60 oder 70g/m2, insbesondere von höchstens 50g/m2, vorgesehen, welche Anlage eine Eingangsseite aufweist, über welche die Papierbahn der Anlage zuführbar ist. Des Weiteren hat die Anlage eine Ausgangsseite, über welche die Papierbahn die Anlage verlässt, wobei die Papierbahn die Anlage von der Eingangsseite zur Ausgangsseite in einer Förderrichtung insbesondere kontinuierlich mit vorzugsweise im Wesentlichen konstanter Fördergeschwindigkeit durchläuft. Erfindungsgemäß ist der Eingangsseite eine Einrichtung, insbesondere ein Druckwerk, vorzugsweise ein Tiefdruckwerk, nachgeordnet, das ein flüssiges Druckmedium, wie eine Stärkelösung insbesondere zur Bildung eines Glimmschutzes, auf die Papierbahn, nämlich nur auf eine Seite der Papierbahn, aufbringen soll. An das Druckwerk schließt in Förderrichtung eine erste Trocknungsstation, insbesondere eine Heißlufttrocknung, an, welche das auf die Papierbahn aufgebrachte Druckmedium trocknen soll. Würde an dieser Stelle die Bearbeitung des Papiers durch die Anlage oder des erfindungsgemäßen Verfahrens enden, würden aufgrund von strukturellen Veränderungen und Verwerfungen des Papiers und damit einhergehender Änderungen der mechanischen Eigenschaften, wie Dehnbarkeit, des Papiers insbesondere im Übergangsbereich von druckmediumfreien und Druckmedium enthaltenden Papierabschnitten die Papierbahn geschwächt, was sich durch Faltenbildung am Übergangsbereich des Papiers optisch bemerkbar macht.Thereafter, a plant for processing a cigarette paper web with an areal density of at most 60 or 70g / m 2 , in particular of at most 50g / m 2 , is provided, which plant has an input side through which the paper web of the system can be fed. Furthermore, the installation has an exit side, via which the paper web leaves the installation, wherein the paper web passes through the installation from the entry side to the exit side in a conveying direction, in particular continuously, preferably with a substantially constant conveying speed. According to the invention, the input side is a device in particular a printing unit, preferably a gravure printing unit, arranged downstream, which is a liquid printing medium, such as a starch solution in particular to form a corona, on the paper web, namely only on one side of the paper web, apply. To the printing unit includes in the conveying direction, a first drying station, in particular a hot air drying, to which should dry the applied to the paper web pressure medium. If the processing of the paper through the system or the method according to the invention would end at this point, the paper web would become due to structural changes and distortions of the paper and associated changes in mechanical properties, such as ductility of the paper, especially in the transition region of paper-free and print medium-containing paper sections weakened, which is visually noticeable by wrinkles at the transition region of the paper.

Insofern schlägt die Erfindung im Anschluss an die erste Trocknung eine Einrichtung zum Befeuchten der Papierbahn vor, die nun das getrocknete Druckmedium enthält, wobei der Befeuchtungseinrichtung außerdem in Förderrichtung eine zweite Trocknungsstation nachgeschaltet ist, durch welche die befeuchtete Papierbahn erneut getrocknet werden soll.In this respect, the invention proposes, after the first drying, a device for moistening the paper web, which now contains the dried printing medium, wherein the moistening device is also followed in the conveying direction by a second drying station, through which the moistened paper web is to be dried again.

Die Aufbringeinrichtung kann eine Drucktechnik, wie die Tiefdrucktechnik, aufweisen. Auch eine alternative Aufbringtechnik, wie eine Filmpresstechnik, ist denkbar.The applicator may include a printing technique such as gravure printing. An alternative application technique, such as a film press technique, is also conceivable.

Erfindungsgemäß soll also das bedruckte Zigarettenpapier, das üblicherweise an einer Faltenbildung leidet, durch vollständige Befeuchtung und eine daran anschließende Trocknung geglättet werden. Unerwarteterweise zeigte es sich, dass durch das Befeuchten und anschließende Trocknen die Qualität der Papierbahn keine Verschlechterung erfährt, vielmehr können gefaltete Bereiche zwischen Druckmedium enthaltenden Papierabschnitten geglättet werden, ohne Verwerfungen und Spannungen an der Papierbahn zu verursachen. Mit dem erfindungsgemäßen Verfahren und der erfindungsgemäßen Vorrichtung können auch komplexere Bild-Strukturen, wie Bildmarken, etc., auf Papier gedruckt werden, ohne dass sich unerwünschte Falten bilden.According to the invention, therefore, the printed cigarette paper, which usually suffers from wrinkling, should be smoothed by complete moistening and subsequent drying. Unexpectedly, it has been found that by wetting and then drying the quality of the paper web does not deteriorate, but wrinkled areas between paper medium-containing paper sections can be smoothed without causing warpage and tension on the paper web. With the method according to the invention and the device according to the invention, even more complex image structures, such as image marks, etc., can be printed on paper without unwanted wrinkles forming.

Bei der Erfindung ist die zweite Trocknungsstation durch eine Kontakttrocknung realisiert, bei der die befeuchtete Papierbahn in einen direkten Kontakt mit wenigstens einem erwärmten Trocknungszylinder oder -walze, vorzugsweise drei oder vier Trocknungszylindem, steht. Dabei wird Wärme an die Papierbahn durch Kontakt mit den Trocknungszylindern übertragen, um die Entfeuchtung der Papierbahn und somit die Trocknung der Papierbahn zu erwirken. Gleichzeitig wird die Papierbahn innerhalb der Trocknungsstation derart auf Zug gespannt, dass die Papierbahn eng an den Trocknungszylindern aufliegt, wodurch ein gleichzeitiges Trocknen und Glätten erzielt wird.In the invention, the second drying station is realized by contact drying, in which the moistened paper web is in direct contact with at least one heated drying cylinder or roller, preferably three or four drying cylinders. In this case, heat is transferred to the paper web by contact with the drying cylinders to obtain the dehumidification of the paper web and thus the drying of the paper web. At the same time, the paper web is tensioned within the drying station in such a way that the paper web rests close to the drying cylinders, whereby a simultaneous drying and smoothing is achieved.

Bei einer bevorzugten Ausführung der Erfindung ist das Druckwerk dazu ausgelegt, ein Druckmuster mit abwechselnden druckmediumfreien und Druckmedium enthaltenden Bereichen auf die Papierbahn zu drucken. Dabei kann insbesondere ein Streifenmuster vorgesehen sein.In a preferred embodiment of the invention, the printing unit is adapted to print on the paper web a printing pattern having alternating regions free of printing medium and printing medium. In this case, in particular a stripe pattern can be provided.

Bei einer Weiterbildung der Erfindung ist das Druckmedium eine wässrige Lösung, vorzugsweise eine Stärkelösung, eine Emulsion oder eine Suspension.In one development of the invention, the pressure medium is an aqueous solution, preferably a starch solution, an emulsion or a suspension.

Vorzugsweise ist das Druckwerk als Tiefdruckwerk ausgeführt und hat einen Presseur und einen mit dem Presseur druckgemäß kooperierenden Druckzylinder. Der Druckzylinder kann einer das Druckmedium aufnehmenden Wanne derart zugeordnet sein, dass beim Drehen der Druckzylinder mit dem flüssigen Druckmedium benetzt wird, um das Druckmedium beim Durchlaufen der Papierbahn durch eine Druckkontaktstelle zwischen dem Druckzylinder und dem Presseur hindurch auf die Papierbahn aufzubringen. Dabei kann die Wanne aus zwei Wannenabschnitten bestehen, nämlich einer Innenwanne und einer Außenwanne. Je nach Durchmesser des Druckzylinders wird mit der Innenwanne oder ohne die Innenwanne gearbeitet. Die Innenwanne weist im Vergleich zur Außenwanne ein geringeres Volumen oder geringere Ausmaße auf. Bei Verwendung von Druckzylindern mit kleinem Durchmesser ist es von Vorteil, die kleinere Innenwanne zu verwenden. Dadurch wird ein besseres Schöpfverhalten des Zylinders erreicht. Für Zylinder ab einem Umfang von etwa 750mm ist die Innenwanne zu klein.Preferably, the printing unit is designed as a gravure printing unit and has a impression roller and a pressure cylinder cooperating with the impression roller according to pressure. The printing cylinder may be associated with a receiving the pressure medium trough so that when rotating the printing cylinder is wetted with the liquid printing medium to apply the printing medium as it passes through the paper web through a pressure contact point between the impression cylinder and the impression roller on the paper web. The tub can consist of two Tub sections exist, namely an inner tub and an outer tub. Depending on the diameter of the impression cylinder, work is done with the inner tub or without the inner tub. The inner tub has a smaller volume or smaller dimensions compared to the outer tub. When using small diameter pressure cylinders, it is advantageous to use the smaller inner tub. As a result, a better Schöpfverhalten the cylinder is achieved. For cylinders with a circumference of about 750mm, the inner tub is too small.

Bei einer bevorzugten Ausführung der Erfindung hat der Druckzylinder einen Außenumfang von 400 bis 1200 mm.In a preferred embodiment of the invention, the printing cylinder has an outer circumference of 400 to 1200 mm.

Bei einer Weiterbildung der Erfindung erfolgt die Heißlufttrocknung hinsichtlich einer bedruckten Seite der Papierbahn kontaktlos. Dies kann bedeuten, dass die Heißlufttrocknung Förderrollen aufweist, die auch in einem direkten Kontakt mit der Papierbahn stehen, wobei allerdings die Förderrollen keine Trocknungsfunktion erfüllen sollen, sondern lediglich eine Förderfunktion ausführen und nur mit der unbedruckten Seite der Papierbahn in Kontakt stehen. Der Transport des Papiers durch die Heißlufttrocknung kann auch über ein Stützsieb erfolgen. Dieses Sieb wird über Förderrollen angetrieben. Das Sieb ist in direktem Kontakt mit dem Papier, jedoch niemals in Kontakt mit der bedruckten Seite des Papiers.In a further development of the invention, the hot-air drying takes place without contact with respect to a printed side of the paper web. This may mean that the hot-air drying conveyor rollers, which are also in direct contact with the paper web, but the conveyor rollers should fulfill no drying function, but only perform a conveying function and are only in contact with the unprinted side of the paper web. The transport of the paper by the hot air drying can also be done via a support screen. This sieve is driven by conveyor rollers. The screen is in direct contact with the paper but never in contact with the printed side of the paper.

Die Heißlufttrocknung kann durch eine die Papierbahn umströmende Strömung gebildet sein, wobei die Umluftströmung eine Temperatur von nicht mehr als 240°C aufweisen soll.The hot air drying may be formed by a flow around the paper web, wherein the circulating air flow should have a temperature of not more than 240 ° C.

Bei einer Weiterbildung der Erfindung ist die Befeuchtungseinrichtung dazu ausgelegt, die gesamte Papierbahn bei deren Durchlauf durch die Befeuchtungseinrichtung hindurch zu befeuchten. Dies kann bedeuten, dass die Befeuchtungseinrichtung eine Bewässerung oder Benetzung der Papierbahn längs deren vollständigen Breite beim Durchlaufen der Befeuchtungseinrichtung realisiert, wobei bei der Förderung der Papierbahn in deren Längsrichtung sämtliche Abschnitte der Papierbahn entsprechend befeuchtet werden, insbesondere ein- oder beidseitig.In a development of the invention, the moistening device is designed to moisten the entire paper web as it passes through the moistening device. This may mean that the moistening device realizes irrigation or wetting of the paper web along its entire width when passing through the moistening device, wherein all sections of the paper web are moistened accordingly in the conveying of the paper web in its longitudinal direction, in particular on one or both sides.

Vorzugsweise befeuchtet die Befeuchtungseinrichtung die Papierbahn mit einer Imprägnierflüssigkeit, die eine Temperatur von 15° bis 75° C aufweisen kann.Preferably, the moistening device wets the paper web with an impregnating liquid, which may have a temperature of 15 ° to 75 ° C.

Bei einer bevorzugten Ausführung der Erfindung bildet die Befeuchtungseinrichtung einen Sumpf aus Imprägnierflüssigkeit, durch welchen Sumpf hindurch die Papierbahn zu deren Befeuchtung hindurch geführt oder gezogen ist.In a preferred embodiment of the invention, the moistening device forms a sump of impregnating liquid, through which sump the paper web is guided or drawn through for wetting it.

Vorzugsweise hat die Befeuchtungseinrichtung zwei Walzen, die derart drehbar gelagert sind, dass sie aneinander gepresst werden können. Dabei kann insbesondere ein Sumpf aus der Imprägnierflüssigkeit an dem Presskontaktbereich der beiden Walzen gebildet werden. Vorzugsweise sollen die Walzen mit einem Druck von höchstens 3,5 bar aneinander gepresst sein.Preferably, the moistening device has two rollers that are rotatably mounted so that they can be pressed against each other. In particular, a sump of the impregnating liquid can be formed at the press contact region of the two rolls. Preferably, the rollers should be pressed together with a pressure of at most 3.5 bar.

Bei einer bevorzugten Ausführung der Erfindung hat die Befeuchtigungseinrichtung zur Bildung des Sumpfes aus der Imprägnierflüssigkeit eine Pumpe, welche die Imprägnierflüssigkeit in den Presskontaktbereich der beiden Walzen fördern kann. Dabei kann an die Pumpe eine Schlauchleitung angeschlossen sein, welche die gepumpte Imprägnierflüssigkeit hin zu dem Presskontaktbereich der beiden Walzen führt.In a preferred embodiment of the invention, the moistening device for forming the sump of the impregnating liquid has a pump which can convey the impregnating liquid into the press contact region of the two rollers. In this case, a hose line can be connected to the pump, which leads the pumped impregnating liquid towards the press contact region of the two rollers.

Bei einer bevorzugten Ausführung der Erfindung ist ein Umfang der wenigstens einen Walze mit einem Beschichtungsmaterial, wie Keramik oder Polytetrafluorethylen, versehen. Andere Beschichtungsmaterialien können eingesetzt werden, welche insbesondere einen geringen Reibungswiderstand, eine homogene Oberflächenstruktur, eine extreme Temperaturbeständigkeit und eine gute chemische Beständigkeit aufweisen und nicht haftend sind.In a preferred embodiment of the invention, a periphery of the at least one roller is provided with a coating material, such as ceramic or polytetrafluoroethylene. Other coating materials can be used, which in particular have a low frictional resistance, a homogeneous surface structure, an extreme temperature resistance and a good chemical resistance and are non-adhesive.

Bei einer Weiterbildung der Erfindung besteht die Befeuchtungseinrichtung aus einer Sprühvorrichtung zum Besprühen der Papierbahn mit der Imprägnierflüssigkeit. Das Befeuchten kann also realisiert werden, indem die Imprägnierflüssigkeit durch Düsen zerstäubt wird und nur auf diese Weise auf die Papierbahn gelangt. Auch zusätzlich zur oben genannten Sumpfanordnung, bei der die Papierbahn dem flüssigen Imprägniermittel ausgesetzt wird, kann die Sprühvorrichtung vorgesehen sein. Die Sumpfbefeuchtung und die Sprühvorrichtung können unabhängig voneinander oder gleichzeitig betrieben werden.In a development of the invention, the moistening device consists of a spraying device for spraying the paper web with the impregnating liquid. The moistening can thus be realized by the impregnating liquid is atomized by nozzles and only in this way reaches the paper web. Also, in addition to the above sump arrangement in which the paper web is exposed to the liquid impregnating agent, the spraying device may be provided. The sump humidification and the spray device can be operated independently or simultaneously.

Vorzugsweise ist die Sprühvorrichtung den Walzen in Förderrichtung nachgeordnet, so dass, sollte ein Sumpfbereich an dem Presskontaktbereich der Walzen vorgesehen sein, die bereits durch den Sumpf vorbefeuchtete Papierbahn noch zusätzlich durch die Sprühvorrichtung insbesondere von beiden Seiten mit Flüssigkeit benetzt werden kann. Dabei kann die Sprühvorrichtung durch ein mit Düsen ausgebildetes Rohr gebildet sein, die derart sich in Breitenrichtung der Papierbahn erstreckend angeordnet sind, dass die Papierbahn vollständig befeuchtet ist, wenn sie die Befeuchtungseinrichtung durchlaufen hat.Preferably, the spraying device is arranged downstream of the rollers in the conveying direction, so that, should a sump area be provided at the press contact area of the rollers, the paper web which has already been pre-moistened by the sump can additionally be wetted with liquid by the spraying device, in particular from both sides. In this case, the spraying device may be formed by a tube formed with nozzles, which are arranged extending in the width direction of the paper web such that the paper web is completely moistened when it has passed through the moistening device.

Bei einer bevorzugten Ausführung der Erfindung ist eine Steuerungs- und/oder Regelungseinrichtung in der Anlage vorgesehen, die insbesondere den Sprühdruck und/oder eine Sprühmenge der Befeuchtungseinrichtung einstellen kann. Dabei kann die Steuerungs- und/oder Regelungseinrichtung auf die Düsen des Rohres steuernd zugreifen.In a preferred embodiment of the invention, a control and / or regulating device is provided in the system, which can adjust in particular the spray pressure and / or a spray quantity of the moistening device. In this case, the control and / or regulating device can access the nozzles of the pipe in a controlled manner.

Alternativ oder zusätzlich kann die Befeuchtungseinrichtung als Tiefdruckwerk ausgeführt sein, das die Papierbahn vollständig befeuchtet.Alternatively or additionally, the moistening device can be designed as a gravure printing unit that completely moistens the paper web.

Bei einer bevorzugten Ausführung der Erfindung ist die Imprägnierflüssigkeit Wasser, eine wässrige Lösung, eine Emulsion oder eine Suspension von wasserlöslichen oder wasserunlöslichen anorganischen oder organischen Verbindungen. Die wässrige Lösung kann Salze, insbesondere Zitrate, zur Einstellung der Glimmgeschwindigkeit aufweisen.In a preferred embodiment of the invention, the impregnating liquid is water, an aqueous solution, an emulsion or a suspension of water-soluble or water-insoluble inorganic or organic compounds. The aqueous solution may have salts, in particular citrates, for adjusting the rate of simmering.

Als eine weitere alternative Möglichkeit, eine Gesamtbefeuchtung der Papierbahn vorzusehen, kann dadurch realisiert werden, dass ein Tiefdruckwert oder eine sogenannte Leimpresse eingesetzt wird.As a further alternative possibility of providing a total humidification of the paper web, it can be realized that a gravure value or a so-called size press is used.

Bei der erfindungsgemäßen Vorrichtung sowie bei dem erfindungsgemäßen ist es vorzugsweise sicherzustellen, dass die aufgetragene Menge an Wasser mindestens 10% der trockenen Papiermasse beträgt. Vorzugsweise liegt der aufgetragene Mengenteil zwischen 25% und 50%. Es ist auch möglich, eine Wassermenge von 100% aufzutragen. Als Grundregel beider Einstellung der Menge der aufzubringenden Imprägnierflüssigkeit kann angegeben werden, dass je größer die Menge des in der ersten Station aufgebrachten Druckmediums desto stärker ist die Papierbahn mit der Imprägnierflüssigkeit zu befeuchten. Vorzugsweise ist als Imprägnierflüssigkeit oder Befeuchtungsflüssigkeit Wasser zu verwenden, das eine Temperatur zwischen 10° und 80° aufweisen kann. Vorzugsweise liegt die Temperatur für das Wasser bei etwa 25°C bis 40°C. In einem derartigen Temperaturbereich wird die anschließende Trocknung erleichtert, wobei zusätzlich überraschenderweise festgestellt wurde, dass ein wärmeres Wasser bei mindestens 40°C für die Befeuchtung die Penetration des im Druckbereich aufgetragenen Druckmediums in die Papierstruktur sogar verbessert und damit weniger Wasser für die Befeuchtung eingesetzt werden muss.In the device according to the invention and in the case of the invention, it is preferable to ensure that the amount of water applied is at least 10% of the dry pulp. Preferably, the applied volume fraction is between 25% and 50%. It is also possible to apply a water quantity of 100%. As a basic rule when adjusting the amount of impregnating liquid to be applied, it can be stated that the greater the amount of the printing medium applied in the first station, the stronger the paper web is to moisten with the impregnating liquid. Preferably, as impregnating liquid or moistening liquid to use water, which may have a temperature between 10 ° and 80 °. Preferably, the temperature for the water is about 25 ° C to 40 ° C. In such a temperature range, the subsequent drying is facilitated, it was additionally surprisingly found that a warmer water at least 40 ° C for humidification even improves the penetration of the pressure medium applied in the print medium in the paper structure and thus less water must be used for humidification ,

Vorzugsweise ist an wenigstens einem Trockenzylinder, insbesondere an dem in Förderrichtung ersten Trockenzylinder, eine Heißlufttrockenhaube vorgesehen, die den Trockenzylinder derart zumindest teilweise umgibt, dass die Papierbahn auf den Trockenzylinder einem Heißlufttrockenstrom, geführt von der Innenseite der Haube, ausgesetzt ist.Preferably, at least one drying cylinder, in particular at the first drying cylinder in the conveying direction, a hot air dryer hood is provided which at least partially surrounds the drying cylinder, that the paper web is exposed to the drying cylinder a hot air drying current, guided from the inside of the hood.

Dabei kann eine Umfangswand des Trocknungszylinders, auf der die Papierbahn aufliegt, eine Temperatur von mindestens etwa 60°C und höchstens etwa 180°C aufweisen.In this case, a peripheral wall of the drying cylinder, on which rests the paper web, have a temperature of at least about 60 ° C and at most about 180 ° C.

Bei einer bevorzugten Ausführung der Erfindung ist die wenigstens eine Trocknungswalze zylindrisch und hat insbesondere eine zylindrische Kontaktaußenfläche. Um die zylindrische Kontaktaußenfläche findet die Trocknung der befeuchteten Papierbahn statt, indem diese in einem Umfangsbereich auf der zylindrischen Kontaktaußenfläche berührend anliegt. Der Umfangsbereich, der von der Papierbahn belegt ist, ist vorzugsweise größer als 90°, 100°, 110° oder 120°, insbesondere zumindest bei einer Trocknungswalze größer als 180°. Vorzugsweise ist die zylindrische Kontaktaußenfläche glatt und erhebungsfrei. Auf diese Weise ist ein Bügeleffekt der befeuchteten Papierbahn erreicht. Dabei ist gewährleistet, dass ein vollflächiges Aufliegen der Papierbahn längs der gesamten Breite innerhalb des so genannten Umfangbereichs realisiert ist. Die Kontaktaußenfläche ist folglich profilfrei.In a preferred embodiment of the invention, the at least one drying roller is cylindrical and in particular has a cylindrical contact outer surface. The drying of the moistened paper web takes place around the cylindrical contact outer surface, in that it bears in a contacting manner in a peripheral region on the cylindrical contact outer surface. The peripheral area, which is occupied by the paper web, is preferably greater than 90 °, 100 °, 110 ° or 120 °, in particular at least for a drying roller greater than 180 °. Preferably, the cylindrical contact outer surface is smooth and free of elevation. In this way, an ironing effect of the moistened paper web is achieved. It is ensured that a full-surface contact of the paper web along the entire width is realized within the so-called peripheral area. The contact outer surface is consequently profile-free.

Bei einer Weiterbildung der Erfindung sind wenigstens drei Trocknungswalzen vorgesehen, die in einer vertikalen Höhenrichtung versetzt angeordnet sind. Dabei kann beispielsweise die erste und letzte Trocknungswalze auf derselben horizontalen Höhe liegen. Die in horizontaler Richtung benachbarten Trocknungswalzen können sich in Höhenrichtung gesehen teilweise überschneiden, so dass die Papierbahn in Förderrichtung nach Abgabe einer ersten Trocknungswalze auf die zweite Trocknungswalze und von der zweiten Trocknungswalze auf die dritte Trocknungswalze entgegengesetzt der Förderrichtung zurückläuft.In a further development of the invention, at least three drying rollers are provided, which are arranged offset in a vertical height direction. In this case, for example, the first and last drying roller can be at the same horizontal height. The horizontally adjacent drying rollers can partially overlap seen in the height direction, so that the paper web runs back in the conveying direction after delivery of a first drying roller on the second drying roller and from the second drying roller to the third drying roller opposite to the conveying direction.

Vorzugsweise hat eine wenigstens zylindrische Trocknungswalze einen Durchmesser von wenigstens 80 cm, vorzugsweise kleiner als 2,5 m, wobei eine bevorzugte Durchmessergröße 1,8 m ist. Die wenigstens eine Trocknungswalze umfasst einen insbesondere geschlossenen Innenhohlraum, der zum Erwärmen der Trocknungswalze mit Wasserdampf oder Heißluft befüllbar ist. Alternativ kann die Trocknungswalze durch Infrarot-Strahlung erwärmt werden.Preferably, an at least cylindrical drying roll has a diameter of at least 80 cm, preferably less than 2.5 m, with a preferred diameter size being 1.8 m. The at least one drying roller comprises a particularly closed inner cavity, which can be filled with steam or hot air to heat the drying roller. Alternatively, the drying roller can be heated by infrared radiation.

Ein besonderer erfindungsgemäßer Aspekt besteht darin, einen vorbestimmten Temperaturverlauf an den wenigstens zwei Trocknungswalzen bereitzustellen.A particular aspect of the invention is to provide a predetermined temperature profile at the at least two drying rollers.

Üblicherweise wäre zu erwarten, dass die Temperatur der Trocknungswalze in Transportrichtung der Papierbahn von Trocknungswalze zu Trocknungswalze zunimmt. Erfindungsgemäß ist der Temperaturverlauf von Trocknungswalze zu Trocknungswalze in Transportrichtung derart einzustellen, dass die Temperatur zumindest von der ersten, eingangsseitigen Trocknungswalze zur zweiten Trocknungswalze zumindest gleich bleibt oder abnimmt. Dabei kann zunächst die unbedruckte Seite der Papierbahn mit der ersten, eingangsseitigen Trocknungswalze in Kontakt kommen und getrocknet werden. Auf der darauffolgenden zweiten Trocknungswalze liegt dann die bedruckte Seite der Papierbahn auf. Würde nun an der zweiten Trocknungswalze eine erhöhte Temperatur vorliegen, so könnte unter Umständen dazu kommen, dass das Druckmedium an den aufgedruckten Stellen der Papierbahn mit der Trocknungswalze verkleben. Aufgrund der reduzierten Temperatur an der zweiten Trocknungswalze wird eine derartiges Verkleben oder thermische Reagieren des aufgedruckten Mediums vermieden. Die Temperatur der dritten Trocknungswalze wird anschließend höher als die der zweiten Trocknungswalze eingestellt, um die Trocknungseffektivität zu verbessern, weil wieder die unbedruckte Seite der Papierbahn in Kontakt mit der Trocknungsoberfläche der dritten Trocknungswalze kommt. Sollte eine vierte Trocknungswalze in der Trocknungsstation vorgesehen sein, ist die Temperatur derart einzustellen, dass diese wieder deutlich reduziert ist, um die oben genannten thermische Reaktion des Druckmediums zu vermeiden. Beispielsweise kann der Temperaturverlauf zwischen drei Trocknungswalzen wie folgt ausgestaltet sein:

  • erste Trocknungswalze: 100°C;
  • zweite Trocknungswalze: 95°C;
  • dritte Trocknungswalze: 120°C.
Usually, it would be expected that the temperature of the drying roller increases in the transport direction of the paper web from drying roll to drying roll. According to the invention, the temperature profile of the drying roller to the drying roller in the transport direction is to be set such that the temperature at least remains the same or decreases at least from the first, input-side drying roller to the second drying roller. Initially, the unprinted side of the paper web can come into contact with the first, input-side drying roller and dried. On the subsequent second drying roller then lies the printed side of the paper web. If an increased temperature were now present at the second drying roller, under certain circumstances it could happen that the printing medium at the printed areas of the paper web with the drying roller stick together. Due to the reduced temperature at the second drying roller, such sticking or thermal reaction of the printed medium is avoided. The temperature of the third drying roller is then set higher than that of the second drying roller to improve the drying efficiency, because again the unprinted side of the paper web comes into contact with the drying surface of the third drying roller. If a fourth drying roller is provided in the drying station, the temperature should be adjusted so that it is again significantly reduced in order to avoid the above-mentioned thermal reaction of the pressure medium. For example, the temperature profile between three drying rollers can be configured as follows:
  • first drying roller: 100 ° C;
  • second drying roller: 95 ° C;
  • third drying roller: 120 ° C.

Sollte der Feststoffgehalt des Druckmediums höher sein, beispielsweise größer als 25 % Feststoffgehalt (Lösungsmittel kleiner als 75%), kann folgender Temperaturverlauf in Transportrichtung für die Trocknungszylinder vorgesehen werden:

  • erster Trocknungszylinder: 95°C;
  • zweiter Trocknungszylinder: 95°C;
  • dritter Trocknungszylinder: 110°C.
If the solids content of the pressure medium is higher, for example, greater than 25% solids content (solvent less than 75%), the following temperature profile in the transport direction for the drying cylinder can be provided:
  • first drying cylinder: 95 ° C;
  • second drying cylinder: 95 ° C;
  • third drying cylinder: 110 ° C.

Bei dieser Ausführung ist also möglich, die erste Trocknungszylindertemperatur und die zweite Trocknungszylindertemperatur zumindest gleichzusetzen, wobei die dritte Trocknungszylindertemperatur, bei der die unbedruckte Seite der Papierbahn in Kontakt mit dem Trocknungszylinder gerät, deutlich erhöht ist.In this embodiment, it is thus possible to at least equate the first drying cylinder temperature and the second drying cylinder temperature, wherein the third drying cylinder temperature, at which the unprinted side of the paper web comes into contact with the drying cylinder, is significantly increased.

Allgemein sei festzustellen, dass die Temperaturen an der Außenseite der Trocknungszylinder nicht 150° übersteigen sollen, wobei es sonst zu einer Verfärbung der Papierbahn kommen kann. Allerdings um einen ausreichenden Trocknungseffekt zu erzielen, sollte eine Mindesttemperatur von 60°C eingestellt sein.Generally, it should be noted that the temperatures on the outside of the drying cylinder should not exceed 150 °, otherwise it may lead to discoloration of the paper web. However, to achieve a sufficient drying effect, a minimum temperature of 60 ° C should be set.

Bei einer bevorzugten Ausführung der Erfindung ist an der Ausgangsseite eine Aufrollwalze vorgesehen, die derart drehangetrieben ist, dass die Papierbahn zumindest bei deren Beförderung durch die zweite Trocknungsstation hindurch vorgespannt ist. Außerdem kann an der Eingangsseite eine Abrollwalze mit einer aufgewickelten Papierbahn angeordnet sein, bei der Spannungen und/oder Unregelmäßigkeiten an der abgewickelten Abrollwalze durch ein federgespanntes Pendelsystem ausgeglichen werden können. Das Pendelsystem kann auch vorzugsweise per Druckluft vorgespannt und für eine entsprechende Pendelbewegung geregelt sein.In a preferred embodiment of the invention, a take-up roll is provided on the output side, which is rotationally driven so that the paper web is biased at least during their transport through the second drying station. In addition, a take-off roll can be arranged with a wound paper web on the input side, can be compensated in the tension and / or irregularities on the unwound rolling roller by a spring-loaded pendulum system. The pendulum system may also preferably be biased by compressed air and regulated for a corresponding pendulum motion.

Wie oben angemerkt, betrifft die Erfindung auch ein Verfahren zum Bearbeiten einer Zigarettenpapierbahn mit einer Flächendichte von 60 oder 70 g/m2, insbesondere von höchstens 50g/m2, wobei insbesondere an einem Druckwerk, insbesondere Tiefdruckwerk, ein flüssiges Medium, wie ein Druckmedium, auf der Papierbahn aufgebracht wird. Anschließend wird das auf die Papierbahn aufgebrachte Druckmedium an einer ersten Trocknungsstation, insbesondere an einer Heißlufttrocknung, getrocknet. Anschließend wird die Papierbahn mit einem flüssigen Imprägniermedium befeuchtet und die befeuchtete Papierbahn wird an einer zweiten Trocknungsstation getrocknet.As noted above, the invention also relates to a method for processing a cigarette paper web having a surface density of 60 or 70 g / m 2 , in particular of at most 50 g / m 2 , wherein, in particular on a printing unit, in particular gravure printing, a liquid medium, such as a printing medium , is applied to the paper web. Subsequently, the pressure medium applied to the paper web is dried at a first drying station, in particular at a hot-air drying. Subsequently, the paper web is moistened with a liquid impregnating medium and the moistened paper web is dried at a second drying station.

Es sei klar, dass das erfindungsgemäße Verfahren gemäß der Funktionsweise der oben genannten erfindungsgemäßen Anlage verfahren kann.It is clear that the method according to the invention can proceed according to the mode of operation of the abovementioned installation according to the invention.

Weitere Eigenschaften, Vorteile und Merkmale der Erfindung werden durch die folgende Beschreibung einer bevorzugten Ausführung der Erfindung anhand der beiliegenden Zeichnungen deutlich, in denen zeigen:

Fig. 1
eine schematische Seitenansicht einer erfindungsgemäßen Anlage;
Fig. 2
eine schematische Detailseitenansicht eines Druckwerks der erfindungsgemäßen Anlage; und
Fig. 3
eine schematische Detailseitenansicht einer Befeuchtungseinrichtung der erfindungsgemäßen Anlage.
Further characteristics, advantages and features of the invention will become apparent from the following description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
Fig. 1
a schematic side view of a system according to the invention;
Fig. 2
a schematic detail side view of a printing unit of the system according to the invention; and
Fig. 3
a schematic detail side view of a humidifying device of the system according to the invention.

In Figur 1 ist die erfindungsgemäße Anlage zum Bearbeiten einer Zigarettenpapierbahn 2 mit einer Flächendichte von 24g/m2 bis 32g/m2 im Allgemeinen mit der Bezugsziffer 1 versehen. Die Papierbearbeitungsanlage 1 umfasst folgende, wesentliche notwendige Hauptstationen: eine Abrollstation 3, ein Tiefdruckwerk 5, einen Heißlufttrockner 7, eine Befeuchtungseinrichtung 9, einen Kontakttrockner 11 sowie eine Aufrollstation 13.In FIG. 1 The inventive system for processing a cigarette paper web 2 having a surface density of 24g / m 2 to 32g / m 2 is provided generally by the reference numeral. 1 The paper processing installation 1 comprises the following essential main stations required: a unwinding station 3, a gravure printing unit 5, a hot air dryer 7, a moistening device 9, a contact dryer 11 and a reeling station 13.

Die Abrollstation 3 umfasst eine Hülse (nicht näher dargestellt) mit einem Innendurchmesser von etwa 76 mm, von der die Papierbahn 2 abgerollt wird. Auch andere Innendurchmesser für die Hülse, beispielsweise von etwa 120 mm, können eingesetzt werden. Die Hülse ist drehbar gelagert oder kann auf einer entsprechend gedrehten Welle befestigt sein. Alternativ kann die Papierrolle auf einem Stahlkern aufgewickelt sein, der in einer Abrollvorrichtung der Abrollstation eingehängt ist.The unwind station 3 comprises a sleeve (not shown in detail) with an inner diameter of about 76 mm, from which the paper web 2 is unrolled. Other inner diameter for the sleeve, for example, of about 120 mm, can be used. The sleeve is rotatably mounted or may be mounted on a correspondingly rotated shaft. Alternatively, the roll of paper may be wound on a steel core suspended in a unwinding device of the unwinding station.

Um Spannungen an der Papierbahn 2 oder Unregelmäßigkeiten des Materials der Papierbahn 2 auszugleichen, kann unmittelbar an die Abrollstation 3 ein Pendelsystem 17 vorgesehen sein, welches mit Druckluft vorgespannt ist, um entsprechende Zugvorspannungen der Papierbahn 2 mitzuteilen. Wie in Figur 2 dargestellt ist, ist das Pendelsystem 17 Teil des Tiefdruckwerks 5.To compensate for stresses on the paper web 2 or irregularities of the material of the paper web 2, a pendulum system 17 may be provided directly to the unwinding station 3, which is biased by compressed air to communicate corresponding tensile biases of the paper web 2. As in FIG. 2 is shown, the pendulum system 17 is part of the gravure printing unit. 5

An dem Tiefdruckwerk 5 wird die Papierbahn 2 auf einer Seite mit einer gewünschten Stärkelösung streifenweise benetzt, indem eine Stärkelösung mit Hilfe des Tiefdruckverfahrens auf eine Papierbahnseite gedruckt wird. Die Funktionsweise des Tiefdruckwerks 5 wird anhand von Figur 2 später erläutert.At the gravure printing unit 5, the paper web 2 is wetted in strips on one side with a desired starch solution by printing a starch solution onto a paper web page by means of the gravure printing process. The operation of the gravure printing unit 5 is based on FIG. 2 explained later.

An das Tiefdruckwerk 5 schließt der Heißlufttrockner 7 an, der eine Trocknungslänge von etwa 3,25 m aufweist. Der Heißlufttrockner 7 ist dazu ausgelegt, eine erwärmte Umluftströmung mit einer Volumenstromgeschwindigkeit von 17000 m3/h bei einer Temperatur von maximal 240°C zu erzeugen. Der Heißlufttrockner 7 dient dazu, eventuell mit dem Druckmedium in dem Tiefdruckwerk 5 eingebrachte Lösungsmittel zu entfernen. Zum Schonen der Papierbahn 2 wird letztere über einen Filz durch den Heißlufttrockner 7 hindurch transportiert. Die Auflage des Papiers erfolgt dabei auch auf der nicht bedruckten Seite des Papiers, wobei die bedruckte Seite bei dem Trocknungsvorgang nicht in Kontakt mit Komponenten des Heißlufttrockners 7 steht. Der Transport der Papierbahn 2 erfolgt über ein Transportband, das beispielsweise aus Filz gebildet ist, welches über Breitrollen 21 angetrieben wird.To the gravure printing unit 5 includes the hot air dryer 7, which has a drying length of about 3.25 m. The hot air dryer 7 is designed to produce a heated circulating air flow at a volume flow rate of 17000 m 3 / h at a maximum temperature of 240 ° C. The hot-air dryer 7 serves to remove possibly introduced with the printing medium in the gravure printing unit 5 solvent. To protect the paper web 2, the latter is transported through a felt through the hot air dryer 7 therethrough. The support of the paper also takes place on the non-printed side of the paper, wherein the printed side is not in contact with components of the hot air dryer 7 during the drying process. The transport of the paper web 2 via a conveyor belt, which is formed for example of felt, which is driven by rollers 21.

An den Heißlufttrockner 7 schließt eine Befeuchtungseinrichtung 9 an, die im Detail in Figur 3 dargestellt ist und später näher erläutert wird. Die Befeuchtungseinrichtung 9 hat die Aufgabe, die Papierbahn 2 über deren gesamten Breite und Länge mit einem flüssigen Imprägniermedium zu befeuchten. Als Imprägniermedium können Wasser, eine wässrige Lösung, Emulsion oder Suspension bei einer Temperatur von 15 bis 75°C herangezogen werden. Die Befeuchtungseinrichtung 9 kann einen Sumpf bilden, der beispielsweise im Kontaktbereich zwischen zwei gegeneinander gepresste Walzen gebildet sein soll, von denen eine oder beide Walzen dem Imprägniermedium ausgesetzt werden. Über den Sumpf wird die Papierbahn 2 der Imprägnierflüssigkeit ausgesetzt, wenn die Papierbahn 2 durch den Kontaktbereich hindurch befördert wird.To the hot air dryer 7 includes a humidifier 9, which in detail in FIG. 3 is shown and will be explained later. The moistening device 9 has the task of moistening the paper web 2 over its entire width and length with a liquid impregnating medium. As impregnation medium water, an aqueous solution, emulsion or suspension at a temperature of 15 to 75 ° C can be used. The moistening device 9 can form a sump, which is to be formed, for example, in the contact region between two rollers pressed against one another, of which one or both rollers are exposed to the impregnating medium. Through the sump, the paper web 2 is exposed to the impregnating liquid as the paper web 2 is conveyed through the contact area.

Anschließend wird die befeuchtete Papierbahn 2 einem Kontakttrockner 11 zugeführt, der, wie in Figur 1 ersichtlich ist, im Wesentlichen aus drei Trocknungszylindem oder -walzen 23, 25 und 27 besteht, die einen gleichen Durchmesser aufweisen. Die Trocknungszylinder 23, 25, 27 werden mit Dampf, insbesondere Wasserdampf, beaufschlagt und können bis zu einer Temperatur von maximal 120°C aufgeheizt werden. Der Kontakttrockner 11 hat die Aufgabe, den an der Befeuchtungseinrichtung 9 zugeführte Flüssigkeitsanteil des Imprägniermediums von der Papierbahn 2 zu entfernen. Dabei soll die Papierbahn 2 in direktem Kontakt mit dem Trocknungszylinder 23, 25, 27 sein, um damit einen gewünschten Glättungseffekt zu erreichen, damit eine vollständig faltenfreie Papierbahn 2 realisiert ist.Subsequently, the moistened paper web 2 is fed to a contact dryer 11, which, as in FIG. 1 can be seen, consists essentially of three drying cylinders or rollers 23, 25 and 27, which have a same diameter. The drying cylinders 23, 25, 27 are charged with steam, in particular steam, and can be heated up to a maximum temperature of 120 ° C. The purpose of the contact dryer 11 is to remove the liquid portion of the impregnating medium fed to the moistening device 9 from the paper web 2. In this case, the paper web 2 should be in direct contact with the drying cylinder 23, 25, 27 in order to achieve a desired smoothing effect, so that a completely wrinkle-free paper web 2 is realized.

Dabei ist eine Bahnführung der Kontakttrocknung 11 vorzugsweise so ausgelegt, dass die bedruckte Seite des Papiers erst am zweiten Trocknungszylinder 25 in Kontakt mit dem letzteren tritt. Der erste Trocknungszylinder 23 ist somit nicht in Kontakt mit der bedruckten Seite der Papierbahn 2 sondern mit der gegenüberliegenden. Diese Ausführung ist insofern vorteilhaft, als es nicht zu einer Verklebung der aufgedruckten Substanzen mit der Oberfläche des Trocknungszylinders 23 kommt. Zur Erhöhung der Trocknerleistung am ersten Trocknungszylinder 23 ist letzterer zusätzlich mit einer Heißlufthaube 61 (T(max.)=250°C; V(Luft max.)=12.000m3/h) ausgestattet. Somit wird das Papier einmal über den Kontakt mit dem Trocknungszylinder getrocknet sowie geglättet, und zusätzlich wird insbesondere das aufgedruckte Material über die Heißluft der Trockenhaube getrocknet.In this case, a web guide of the contact drying 11 is preferably designed so that the printed side of the paper only comes into contact with the latter at the second drying cylinder 25. The first drying cylinder 23 is therefore not in contact with the printed side of the paper web 2 but with the opposite one. This embodiment is advantageous in that it does not come to a bonding of the printed substances with the surface of the drying cylinder 23. To increase the dryer output at the first drying cylinder 23, the latter is additionally equipped with a hot air hood 61 (T (max.) = 250 ° C., V (air max.) = 12,000 m 3 / h). Thus, the paper is once dried over the contact with the drying cylinder and smoothed, and in addition, in particular, the printed material is dried over the hot air of the drying hood.

Die Trocknungszylinder 23 bis 27 haben jeweils eine zylindrische Kontaktaußenfläche, die von der befeuchteten Papierbahn 2 zum großen Teil kontaktbelegt ist. Vorzugsweise ist der belegte Umfangsbereich der Trocknungszylinder 23 bis 27 größer als 90°, 100° oder 120°. Bei dem zweiten Trocknungszylinder 25 ist die Umfangsbelegung größer als 180°.The drying cylinders 23 to 27 each have a cylindrical contact outer surface, which is contacted by the wetted paper web 2 for the most part contact. Preferably, the occupied peripheral area of the drying cylinders 23 to 27 is greater than 90 °, 100 ° or 120 °. In the second drying cylinder 25, the circumferential coverage is greater than 180 °.

Wie in Figur 1 ersichtlich ist, sind drei Trocknungszylinder 23 bis 27 vorgesehen, die in Höhenrichtung zueinander versetzt sind. Dabei ist ein horizontaler Abstand des ersten 23 und dritten Trockenzylinders 27 derart eingestellt, dass er kleiner als der Durchmesser des (Zwischen-) Trocknungszylinders 25 ist. Somit kommt es zu einer in Höhenrichtung gesehenen bereichsweisen Überschneidung der Trocknungszylinder 23 bis 25, so dass es bei Abgabe Papierbahn 2 von dem ersten Trocknungszylinder 23 zum zweiten Trocknungszylinder 25 und vom zweiten Trocknungszylinder 25 auf den dritten Trocknungszylinder 27 zu einer Zurückführung der Papierbahn 2 der Förderrichtung entgegengesetzt kommt.As in FIG. 1 it can be seen, three drying cylinders 23 to 27 are provided, which are offset from each other in the height direction. In this case, a horizontal distance of the first 23 and third drying cylinder 27 is set such that it is smaller than the diameter of the (intermediate) drying cylinder 25. Thus, there is an area-wise overlapping of the drying cylinders 23 to 25 seen in the height direction, so that when the paper web 2 is discharged from the first drying cylinder 23 to the second drying cylinder 25 and from the second drying cylinder 25 to the third drying cylinder 27, the paper web 2 is returned to the conveying direction comes opposite.

Die Papierbahn 2 ist innerhalb der Trocknungsstation 11 auf Zug vorgespannt, um sich plan um die Kontaktaußenfläche der Trockenzylinder 23 bis 27 anzulegen.The paper web 2 is biased within the drying station 11 to train to plan to apply the contact outer surface of the drying cylinders 23 to 27.

Dem Kontakttrockner 11 schließt eine Aufrollstation 13 an, die einen Tragzylinder 31 und eine Aufrollwalze 33 aufweist. Die Funktion des Tragzylinders 31 besteht darin, die notwendige Spannung der Papierbahn 2 aufzuerlegen, damit eine einwandfreie Aufwicklung der Papierbahn 2 an der Aufrollwalze 33 gewährleistet ist.The contact dryer 11 is followed by a reeling station 13, which has a support cylinder 31 and a winding roller 33. The function of the support cylinder 31 is to impose the necessary tension of the paper web 2, so that a proper winding of the paper web 2 is ensured at the take-up roller 33.

Im Folgenden wird detailliert auf das Tiefdruckwerk 5 gemäß Figur 2 eingegangen.The following is a detailed on the gravure printing unit 5 according to FIG. 2 received.

Nachdem die Papierbahn 2 von dem Pendelsystem 17 unter eine Zugspannung gesetzt ist, wird die Papierbahn 2 einer Anordnung aus Presseur 41 und Druckzylinder 43 zugeführt, der mit einem flüssigen Druckmedium (nicht näher dargestellt) benetzt wird. Die Benetzung des Druckzylinders 43 wird dadurch erreicht, dass der Druckzylinder 43 bei dessen Drehvorgang um seine eigene Achse eine Wanne durchläuft, welche die Druckflüssigkeit enthält. Die Wanne kann durch zwei Wannenabschnitte gebildet sein, nämlich einer Außenwanne 45 und einer Innenwanne 47, die im Vergleich zur Außenwanne ein geringeres Volumen aufweist. Bei der Verwendung von Druckzylindern 43 mit einem kleinen Durchmesser ist es von Vorteil, die Innenwanne 47 zu verwenden, um ein besseres Schöpfverhalten der Druckzylinder 43 zu erreichen. Der Presseur 41 baut den notwendigen mechanischen Druck auf, um das Druckmedium von dem Druckzylinder 43 auf die Papierbahn 2 übergehen zu lassen. Zudem sorgt der Presseur 41 für den Transport der Papierbahn 2 durch das Tiefdruckwerk 5 hindurch. Eine Rakel 59 ist in der Nähe des Druckzylinders 43 vorgesehen, um überschüssiges Druckmedium von dem Druckzylinder 43 abzustreifen. Die Papierbahn 2 verlässt das Tiefdruckwerk 5 hin zum Heißlufttrockner 7.After the paper web 2 is set by the pendulum system 17 under a tensile stress, the paper web 2 of an assembly of impression roller 41 and pressure cylinder 43 is supplied, which is wetted with a liquid pressure medium (not shown). The wetting of the printing cylinder 43 is achieved in that the pressure cylinder 43 passes through its own axis during its rotation process a tub which contains the pressure fluid. The trough may be formed by two trough sections, namely an outer trough 45 and an inner trough 47, which has a smaller volume compared to the outer trough. When using pressure cylinders 43 with a small diameter, it is advantageous to use the inner trough 47 in order to achieve a better tapping behavior of the pressure cylinders 43. The impression roller 41 builds up the necessary mechanical pressure to allow the printing medium to pass from the impression cylinder 43 to the paper web 2. In addition, the impression roller 41 ensures the transport of the paper web 2 through the gravure printing unit 5 therethrough. A squeegee 59 is provided in the vicinity of the printing cylinder 43 to strip excess printing medium from the printing cylinder 43. The paper web 2 leaves the gravure printing unit 5 to the hot air dryer. 7

In Figur 3 ist die Befeuchtungseinrichtung 11 im Detail dargestellt, die im Wesentlichen aus zwei Walzen 51, 53 besteht, die einen Kontaktpressbereich 55 definieren, durch den die Papierbahn 2 hindurchgezwängt wird. Über eine nicht näher dargestellte Pumpe wird im Kontaktpressbereich 55 ein Sumpf aus Imprägnierflüssigkeit gebildet, um die gesamte Papierbahn 2 mit der Imprägnierflüssigkeit zu benetzen.In FIG. 3 the wetting device 11 is shown in detail, which consists essentially of two rollers 51, 53 which define a contact pressing region 55, through which the paper web 2 is forced through. Via a pump, not shown, a sump of impregnating liquid is formed in the contact pressing area 55 in order to wet the entire paper web 2 with the impregnating liquid.

Alternativ oder optional kann zusätzlich zur Sumpfbildung am Kontaktpressbereich 55 anschließend ein Sprührohr 57 vorgesehen sein, welches entweder auf einer Seite der Papierbahn 2 oder auf beiden Seiten (nicht dargestellt) angeordnet sein kann. Das Sprührohr 57 hat mehrere Düsen, aus denen die Imprägnierflüssigkeit auf die Papierbahn 2 aufgesprüht wird, um ein vollständiges Benetzen der Papierbahn 2 mit Imprägnierflüssigkeit zu realisieren.Alternatively or optionally, in addition to the sump formation at the contact pressing area 55, a spray tube 57 may subsequently be provided, which may be arranged either on one side of the paper web 2 or on both sides (not shown). The spray tube 57 has a plurality of nozzles from which the impregnating liquid is sprayed onto the paper web 2 in order to realize a complete wetting of the paper web 2 with impregnating liquid.

Anschließend verlässt die befeuchtete Papierbahn 2 die Befeuchtungseinrichtung 11 für deren Trocknungs- und Glättungsbehandlung in dem Kontakttrockner 11.Subsequently, the moistened paper web 2 leaves the moistening device 11 for its drying and smoothing treatment in the contact dryer 11.

Nach der Kontakttrocknung zeigte sich, dass das Papier überraschenderweise keine Falten aufweist und die mechanischen Eigenschaften, wie die Dehnbarkeit, der Papierbahn 2 deutlich verbessert wurden, so dass in den nachfolgenden Schneidanlagen wesentlich höhere Fördergeschwindigkeiten von bis zu 600m/min erreicht werden können. Durch die Imprägnierung in der Befeuchtungseinrichtung und der Kontakttrocknung in dem Kontakttrockner, lässt sich das im Tiefdruckverfahren bedruckte Papier so weiterverarbeiten, als wäre es unbedruckt.After the contact drying, it was found that, surprisingly, the paper had no wrinkles and the mechanical properties, such as extensibility, of the paper web 2 were markedly improved, so that substantially higher conveying speeds of up to 600 m / min can be achieved in the subsequent cutting systems. As a result of the impregnation in the moistening device and the contact drying in the contact dryer, the paper printed in the gravure printing method can be further processed as if it were unprinted.

Die in der vorstehenden Beschreibung, den Figuren und den Ansprüchen offenbarten Merkmale können sowohl einzeln als auch in beliebiger Kombination für die Realisierung der Erfindung in den verschiedenen Ausgestaltungen von Bedeutung sein.The features disclosed in the foregoing description, the figures and the claims may be of importance both individually and in any combination for the realization of the invention in the various embodiments.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
PapierbearbeitungsanlagePaper processing plant
22
Papierbahnpaper web
33
Abrollstationunrolling
55
TiefdruckwerkGravure printing unit
77
HeißlufttrocknerHot air dryer
99
Befeuchtungseinrichtunghumidifying
1313
Aufrollstationreeling
1111
Kontakttrocknercontact dryer
1717
Pendelsystempendulum system
2121
Leitrollenidlers
23, 25, 2723, 25, 27
Trocknungszylinderdrying cylinder
3131
Tragzylindersupport cylinder
3333
Aufrollwalzewinding roller
4141
Presseurimpression roller
4343
Druckzylinderpressure cylinder
4545
Außenwanneoutdoor tub
4747
Innenwanneinner tub
51, 5351, 53
Walzenroll
5555
KontaktpressbereichContact Press area
5757
Sprührohrlance
5959
Rakeldoctor
6161
HeißlufthaubeHot air hood

Claims (16)

  1. Installation for processing a cigarette paper web (2) with a basis weight not exceeding 70g/m2 comprising: an input side, via which the paper web (2) is fed to the installation, an output side via which the paper web (2) leaves the installation, wherein the paper web (2) runs through the installation from the input side to the output side in a conveying direction, a printing unit downstream of the input side, preferably a gravure printing unit (5), for applying a liquid print medium onto the paper web (2), wherein the printing unit is designed to print a printing pattern with alternating areas containing print medium and not containing print medium onto the paper web (2), a first drying station, in particular a hot-air dryer, following the applying device in conveying direction for drying the print medium applied to the paper web (2), a device for humidification of the paper web (2) following the first drying station in conveying direction, and a second drying station following the humidification device in conveying direction, by means of which the humidified paper web (2) is dried, wherein the second drying station is realised by contact drying, wherein the humidified paper web (2) is in direct contact with at least one heated drying roller (23, 25, 27), preferably three or four drying rollers (23, 25, 27), characterised in that the first drying cylinder (23) is not in contact with the printed side of the paper web (2).
  2. Installation according to claim 1, wherein the printing unit prints a printing pattern onto the paper web (2), the pattern having alternating areas free of print medium and areas covered with print medium, wherein in particular a pattern of bands is printed, and/or wherein the print medium is a water-based solution, an emulsion and/or a suspension, preferably a starch solution.
  3. Installation according to one of the preceding claims, wherein the printing unit includes an impression cylinder (41) and a printing cylinder (43) printingly cooperating with the impression cylinder (41), wherein in particular the printing cylinder (43) and/or the impression cylinder (41) is associated with a basin receiving the print medium such that upon turning the printing cylinder (43) it is covered by the liquid print medium in order to print the print medium during passage of the paper web through a pressure contact area of the printing cylinder (43) and the impression cylinder (41), wherein in particular the printing cylinder (43) includes an outer circumference of 400 mm to 1200 mm.
  4. Installation according to one of the preceding claims in which the first drying station, in particular the hot air dryer is working contactless with respect to a printed side of the paper web (2), and/or in which the first drying station, in particular the hot air dryer station includes a conveyor belt like a sieve that is driven via conveyor rollers, which conveyor belt is in contact with in particular only an unprinted side of the paper web (2) and conveys the paper web (2) through the first drying station, and/or in which the first drying station, in particular the hot air dryer generates an air stream surrounding the paper web (2) and having a temperature not exceeding 240°C.
  5. Installation according to one of the preceding claims, in which the humidification device humidifies the entire paper web (2) during its passage through the humidification device, and/or in which the humidification device humidifies the paper web (2) with an impregnation liquid having a temperature of 15° to 75°C, and/or in which the humidification device forms a sump of impregnation liquid through which the paper web (2) is drawn for its humidification.
  6. Installation according to one of the preceding claims, in which the humidification device includes two rollers (51, 53) that are rotatably mounted such that they are pressed against each other, wherein a sump of impregnation liquid is formed at a pressure contact area of the rollers (51, 53), wherein in particular the rollers (51, 53) can be pressed against each other with a pressure not exceeding 3,5 bar.
  7. Installation according to one of the preceding claims, in which the humidification device includes a pump for forming a sump of impregnation liquid that conveys the impregnation liquid into the pressure contact area.
  8. Installation according to one of the claims 6 or 7, in which the circumference of at least one roller is provided with a coating material like ceramic or polytetrafluorethylen.
  9. Installation according to one of the preceding claims in which the humidification device includes a spraying apparatus for spraying the paper web (2) with an impregnation liquid, wherein in particular the spraying apparatus is arranged downstream of the rollers (51, 53) in conveying direction, and/or in which the spraying apparatus is formed by a tube provided with nozzles which is arranged extending in cross direction of the paper web (2) such that the paper web (2) is completely humidified.
  10. Installation according to claim 9, in which a spraying pressure and/or a spraying amount is adjustable through a control or closed-loop control device, and/or in which the impregnation liquid is water, a water-based solution, an emulsion or a suspension.
  11. Installation according to one of the preceding claims, in which a circumferential wall of the drying roller (23), on which the paper web (2) resting, is heated to a temperature not exceeding 180°C, and/or in which at least one of the drying rollers is at least partially radially surrounded by a hood that directs a stream of hot air at least partially around the at least one drying roller (23, 25, 27), wherein in particular only the roller directly following the entrance of a second drying station is provided with a hood.
  12. Installation according to one of the preceeding claims, in which at least one drying roller is cylindrical and includes an in particular cylindrical outer contact surface around which the humidified paper web (2) closely fits within a circumferential range that is preferably larger than 90°, 100°, 110° or 120°, in particular, for at least one of the drying rollers, larger than 180°, wherein in particular the cylindrical outer contact surface is smooth so that in particular full surface contact of the paper web (2) is realised along its complete width within the circumferential area.
  13. Installation according to one of the preceeding claims, in which at least three drying rollers are provided that are offset in vertical direction, wherein the drying rollers subsequent to each other in horizontal direction are partially intersecting seen in vertical direction.
  14. Installation according to one of the preceding claims in which a reeling up roller (33) is provided at the output side, the roller being rotationally driven such that the paper web (2) is pretensioned at least during its transport through the second drying station, and/or in which an unreeling roller with a wound-up paper web (2) is disposed at the input side, wherein inconstancies in the shape of the paper web are compensated at the unwound unreeling roller by a pendulum system (17) pretensioned by means of compressed air.
  15. Method for processing a cigarette paper web (2) with a basis weight not exceeding 70g/m2, wherein a liquid print medium is applied to the paper web (2) at a printing unit, in particular a gravure printing unit (5), wherein a printing pattern with alternating areas containing print medium and not containing print medium is printed onto the paper web (2), the print medium applied to the paper web is dried at a first drying station, in particular a hot air dryer, subsequently the paper web (2) is humidified with a liquid impregnation medium and the humidified paper web (2) is dried at a second drying station by contact drying, wherein the humidified paper web (2) is brought into direct contact with at least one heated drying roller (23, 25, 27), preferably three or four drying rollers (23, 25, 27), characterised in that the first drying cylinder (23) is not brought into contact with the printed side of the paper web (2).
  16. Method according to claim 15 that proceeds according to the functionality of the installation designed according to one of the claims 1 to 14.
EP10719264.3A 2009-04-30 2010-04-30 Arrangement and method for processing a paper web, in particular a cigarette paper web Active EP2425056B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10719264T PL2425056T3 (en) 2009-04-30 2010-04-30 Arrangement and method for processing a paper web, in particular a cigarette paper web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009019600A DE102009019600A1 (en) 2009-04-30 2009-04-30 Plant and method for processing a paper web, in particular a cigarette paper web
PCT/EP2010/002665 WO2010124879A1 (en) 2009-04-30 2010-04-30 Arrangement and method for processing a paper web, in particular a cigarette paper web

Publications (2)

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EP2425056A1 EP2425056A1 (en) 2012-03-07
EP2425056B1 true EP2425056B1 (en) 2015-01-28

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EP10719264.3A Active EP2425056B1 (en) 2009-04-30 2010-04-30 Arrangement and method for processing a paper web, in particular a cigarette paper web

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US (2) US8863657B2 (en)
EP (1) EP2425056B1 (en)
KR (1) KR101738178B1 (en)
CN (1) CN102421963B (en)
BR (1) BRPI1013913B1 (en)
CA (1) CA2758463C (en)
DE (1) DE102009019600A1 (en)
ES (1) ES2535525T3 (en)
MY (1) MY156489A (en)
PL (1) PL2425056T3 (en)
WO (1) WO2010124879A1 (en)

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KR101297831B1 (en) * 2011-11-08 2013-08-19 주식회사 케이티앤지 Device of moving low ignition propensity cigarette paper and device of manufacturing low ignition propensity cigarette paper including the same
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JP6149662B2 (en) * 2013-10-03 2017-06-21 セイコーエプソン株式会社 Sheet manufacturing apparatus and sheet manufacturing method
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US20150004321A1 (en) 2015-01-01
BRPI1013913A2 (en) 2016-04-05
ES2535525T3 (en) 2015-05-12
PL2425056T3 (en) 2015-06-30
CA2758463A1 (en) 2010-11-04
DE102009019600A1 (en) 2010-11-11
MY156489A (en) 2016-02-26
CA2758463C (en) 2017-08-15
KR20120012976A (en) 2012-02-13
CN102421963A (en) 2012-04-18
US20120111209A1 (en) 2012-05-10
US9333530B2 (en) 2016-05-10
WO2010124879A1 (en) 2010-11-04
BRPI1013913B1 (en) 2019-09-10
EP2425056A1 (en) 2012-03-07
KR101738178B1 (en) 2017-05-29
CN102421963B (en) 2015-02-25
US8863657B2 (en) 2014-10-21

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