WO2001068269A1 - Device for coating a material web, especially paper or cardboard web - Google Patents

Device for coating a material web, especially paper or cardboard web Download PDF

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Publication number
WO2001068269A1
WO2001068269A1 PCT/EP2001/002420 EP0102420W WO0168269A1 WO 2001068269 A1 WO2001068269 A1 WO 2001068269A1 EP 0102420 W EP0102420 W EP 0102420W WO 0168269 A1 WO0168269 A1 WO 0168269A1
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WO
WIPO (PCT)
Prior art keywords
press
web
coating
rolls
spring
Prior art date
Application number
PCT/EP2001/002420
Other languages
German (de)
French (fr)
Inventor
Ingo Becker
Alexander Klupp
Original Assignee
Voith Paper Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent Gmbh filed Critical Voith Paper Patent Gmbh
Publication of WO2001068269A1 publication Critical patent/WO2001068269A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls

Definitions

  • the invention relates to a device for coating a material web, in particular a paper or cardboard web, with two press rolls mounted axially parallel next to one another in a frame, of which one press roll can be pressed against the other by means of an actuating element against the other press roll to form a press nip through which the material web is guided, and with an application and metering system for at least one press roll
  • Film presses are also used to coat paper or cardboard webs with pigment coating color, i.e. evenly apply a covering layer to the surface.
  • coating color it must be ensured that not too much color is printed into the web as it passes through the press nip endeavors to set the lowest possible line pressure between the two press rolls. It has been shown that a desired line pressure close to 0 N / m cannot be achieved, since the pressure is too low Pressure in the hydraulic or pneumatic control element causes the swiveled press roll to become unstable. The press nip between the two press rolls becomes unstable with negative effects on the quality of the coated web
  • the invention is therefore based on the object of improving a coating device of the generic type in such a way that a low line pressure can be set in the press nip between the two press rolls
  • the counterforce makes it possible to build up sufficient pressure in the pressing hydraulic or pneumatic actuating element for stable operation of the device and at the same time to set the line pressure in the press nip very low
  • Figure 1 shows a side view of an overall view of a film press
  • Figure 2 shows a schematic diagram of the arrangement and operation of the compression spring between the press rolls
  • Figure 3 shows a side view of a section of a device in which the counterforce is adjustable
  • the coating device shown in FIG. 1 is integrated in a paper machine.It consists of two press rolls 2, 3 which are rotatably mounted axially parallel to one another in a frame 1, one of which press roll 2 is stationary, the other press roll 3 is circumferentially pressable against the first press roll 2 Press roller 3 is suspended between two lateral pivot levers 4, which are mounted in the frame 1 by means of a hydraulic piston-cylinder unit as an actuating element 5 about a pivot axis 6 in the direction of the press roller 2 and can be pivoted away therefrom 3 print circumferentially against the press roller 2 Alternatively, a pneumatic piston-cylinder unit can also be used as the actuating element 5. A pneumatic bellows without piston can also be used as the actuating element 5, as shown in FIG. 2, when the press roller 3 swivels against the press roller 2 there is a press nip 7 to which the Coated paper web 8 is fed from above by a guide roller 9.
  • the two press rollers 2, 3 are preferably rubberized on their outer surface
  • coating material 7 is fed to the press nip 7 on the inlet side of the web 8 for both web sides.
  • an application and metering system 10, 11 is arranged on the press nip 7 on each press roll 2, 3 each application and metering system 10, 11 preferably has an application chamber which is open towards the respective press roller 2, 3 and into which coating material is fed under pressure.
  • each application chamber is closed off by a metering element, which on the press roll 2, 3 applied coating material is stripped down to the desired film thickness.
  • the metering element used is preferably a doctor rod with a structured surface, that is to say elevations and recesses, with which volumetric metering can be used.
  • Doctor rods with circumferential rollers are preferably used
  • the coating material applied in metered fashion on the lateral surfaces of the press rolls 2, 3 is transferred to the web 8 in the press nip 7.
  • the web 8 coated on both sides is fed from a non-contact guide element 12 to a dryer, not shown.
  • the line pressure between the two press rolls 2, 3 is set via the hydraulic or pneumatic pressure in the actuating element 5, which can be varied via a proportional valve.
  • a minimum pressure in the control element 5 is required. This minimum pressure is too great as a line pressure between the two press rollers 2, 3 for certain surface coatings with pigment coating ink, since too much ink would be pressed into the paper or cardboard web 8.
  • At least one compression spring 13, 14 is arranged between the two press rolls 2, 3, which generates a counterforce pushing the press rolls 2, 3 apart in the press nip 7.
  • Two springs 13, 14 are preferably arranged on each longitudinal side of the device between the bearing housings 15, 16 of the press rolls 2, 3, which are held at an adjustable distance by a spacer bolt 17.
  • the spacer bolt 17 transmits the pressing force of the actuating element 5 against the force of the springs 13, 14 to the bearing housing 15, 16 and thus to the press rollers 2, 3.
  • the springs 13, 14 are designed so that they have a largely constant spring constant, so that the counterforce increases linearly with the distance between the two press rolls 2, 3 from each other.
  • the springs 13, 14 are designed as leaf springs which are supported on the respective bearing housing 15, 16. You have a spring travel, which is sufficient in connection with the spring constant to build up such a large back pressure that the line pressure between the press rolls 2, 3 can be set to zero at the required minimum pressure of the actuating element 5.
  • the length of the spacer bolt 17 can preferably be changed so that the basic position can be set in which the counterforce of the springs 13, 14 is effective.
  • the spacer pin 17 has an articulated ball on one side, which is mounted in an articulated socket 18 fastened to the spring 14 on the outside.
  • a sleeve 19 screwed, the axial position of which can be adjusted relative to the bolt 17.
  • the spherical shell-shaped end of the sleeve 19 is also mounted in a joint socket which is fastened to the outside of the second spring 13.
  • this construction enables a pivoting movement of the bolt 17 relative to the bearing housings 15, 16, so that the pivoting movement of the press roll 3 against the press roll 2 is not impaired. So that the spacer bolt 17 does not bend when the press roll 3 is pivoted away, it is held in its position in the socket 18 by a clamping ring 20. By removing the clamping ring 20, the spacer 17 with the screwed-on sleeve 19 can be completely removed if the device is to be operated without the action of the springs 13, 14.
  • the effective length of the spacer bolt 17 is set as a basic setting so that the press roll 2, 3 are at a distance of 0 millimeters from one another at the minimum pressure required for the actuating element 5.
  • the line pressure required for optimal coating between the press rolls 2, 3 is then set by increasing the pressure in the actuating element 5.
  • the pressure of the actuating element 5 is varied such that the two press rolls 2, 3 are at the same distance from one another on each longitudinal side, and so the line force is uniform over the entire axial length of both press rolls 2, 3.

Abstract

According to prior art, devices for coating paper or cardboard webs (8) are provided with two press rollers (2, 3) which are mounted in parallel to the axis and next to one another in a frame (4). One press roller (3) can be peripherally pressed against the remaining press roller (2) by means of a control element (5) for forming a press gap (7). The web (8) is guided through said gap. At least one press roller (2, 3) contains an application and dosing system (10, 11) that applies a dosed film of a coating material to the casing of the press roller (2, 3). Said film is subsequently transmitted to the web (8) in the press gap (7). According to the invention, a pressure spring (13, 14) is arranged between the two press rollers (2, 3). Said spring produces a counterforce in the press gap (7). Said counterforce presses the press rollers (2, 3) away from one another.

Description

B E S C H R E I B U N G DESCRIPTION
Vorrichtung zum Beschichten einer Materialbahn, insbesondere einer Papieroder KartonbahnDevice for coating a material web, in particular a paper or cardboard web
Technisches GebietTechnical field
Die Erfindung betrifft eine Vorrichtung zum Beschichten einer Materialbahn, insbesondere einer Papier- oder Kartonbahn, mit zwei achsparallel nebeneinander in einem Gestell gelagerten Preßwalzen, von denen eine Preßwalze mittels eines Stellelements gegen die andere Preßwalze umfänglich andruckbar ist, um einen Preßspalt zu bilden, durch den die Materialbahn gefuhrt wird, und mit einem Auftrag- und Dosiersystem für zumindest eine PreßwalzeThe invention relates to a device for coating a material web, in particular a paper or cardboard web, with two press rolls mounted axially parallel next to one another in a frame, of which one press roll can be pressed against the other by means of an actuating element against the other press roll to form a press nip through which the material web is guided, and with an application and metering system for at least one press roll
Stand der TechnikState of the art
Zum beidseitigem Auftragen von Leim, Starke, CMC, synthetischen Leim oder Pigmentdispersionen auf Papier- oder Kartonbahnen sind Vorrichtungen mit zwei achsparallel nebeneinander in einem Gestell drehbar gelagerten Preßwalzen bekannt, zwischen denen ein Preßspalt ausgebildet ist, durch den die Papier- oder Kartonbahn gefuhrt wird Aus der DE-A 44 31 202 ist eine sogenannte Filmpresse bekannt, bei der an jeder Preßwalze ein Auftrag- und Dosiersystem angeordnet ist, das einen dosierten Film von Beschichtungsmaterial zunächst auf deren Mantel auftragt, der anschließend in dem Preßspalt an die Bahn übergeben wird Eine der beiden Preßwalzen ist gegen die andere schwenkbar im Gestell gelagert und kann mittels einer Kolben-Zyiinder- Einheit als Stellelement umfänglich gegen die andere Preßwalze gepreßt werdenFor the double-sided application of glue, starch, CMC, synthetic glue or pigment dispersions to paper or cardboard webs, devices with two axially parallel press rolls rotatably mounted in a frame are known, between which a press nip is formed through which the paper or cardboard web is guided DE-A 44 31 202 a so-called film press is known, in which an application and metering system is arranged on each press roll, which first applies a metered film of coating material to its jacket, which is then transferred to the web in the press nip Both press rollers are pivotally mounted in the frame against the other and can be pressed circumferentially against the other press roller by means of a piston-cylinder unit as an adjusting element
Filmpressen werden auch eingesetzt, um Papier- oder Kartonbahnen mit Pigmentstreichfarbe zu streichen, also eine abdeckende Schicht auf die Oberflache gleichmäßig aufzutragen Beim Auftragen von Streichfarbe muß darauf geachtet werden, daß nicht zuviel Farbe beim Durchlauf durch den Preßspalt in die Bahn hineingedruckt wird Man ist daher bestrebt, einen möglichst geringen Liniendruck zwischen den beiden Preßwalzen einzustellen Dabei hat es sich gezeigt, daß ein gewünschter Liniendruck nahe 0 N/m nicht realisiert werden kann, da bei zu geringem Druck in dem hydraulischen oder pneumatischen Stellelement die angeschwenkte Preßwalze in einen instabilen Zustand gerat Der Preßspalt zwischen den beiden Preßwalzen wird instabil mit negativen Auswirkungen auf die Qualltat der beschichteten BahnFilm presses are also used to coat paper or cardboard webs with pigment coating color, i.e. evenly apply a covering layer to the surface. When applying coating color, it must be ensured that not too much color is printed into the web as it passes through the press nip endeavors to set the lowest possible line pressure between the two press rolls. It has been shown that a desired line pressure close to 0 N / m cannot be achieved, since the pressure is too low Pressure in the hydraulic or pneumatic control element causes the swiveled press roll to become unstable. The press nip between the two press rolls becomes unstable with negative effects on the quality of the coated web
Darstellung der ErfindungPresentation of the invention
Der Erfindung liegt daher die Aufgabe zugrunde, eine Beschichtungsvorπchtung der gattungsgemaßen Art so zu verbessern, daß ein geringer Liniendruck im Preßspalt zwischen den beiden Preßwalzen eingestellt werden kannThe invention is therefore based on the object of improving a coating device of the generic type in such a way that a low line pressure can be set in the press nip between the two press rolls
Diese Aufgabe wird nach der Erfindung dadurch gelost, daß zwischen den beiden Preßwalzen eine Druckfeder angeordnet ist, die im Preßspalt eine die Preßwalzen auseinander druckende Gegenkraft erzeugtThis object is achieved according to the invention in that a compression spring is arranged between the two press rolls, which generates a counterforce which presses the press rolls apart in the press nip
Die Gegenkraft ermöglicht es einen für einen stabilen Betrieb der Vorrichtung ausreichenden Druck in dem anpressenden hydraulischen oder pneumatischen Stellelement aufzubauen und zugleich den Liniendruck im Preßspalt sehr gering einzustellenThe counterforce makes it possible to build up sufficient pressure in the pressing hydraulic or pneumatic actuating element for stable operation of the device and at the same time to set the line pressure in the press nip very low
Als weiterer Vorteil tritt hinzu, daß die Druckfeder äußere Storeinflusse auf die Geometrie des Preßspalts, insbesondere thermische Einflüsse, weitgehend kompensiertAnother advantage is that the compression spring largely compensates for external influences on the geometry of the press nip, in particular thermal influences
Die Unteranspruche enthalten bevorzugte, da besonders vorteilhafte Ausgestaltungen einer erfindungsgemaßen BeschichtungsvornchtungThe subclaims contain preferred, since particularly advantageous, configurations of a coating device according to the invention
Kurze Beschreibung der ZeichnungBrief description of the drawing
Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht dargestellten AusfuhrungsbeispielsThe drawing serves to explain the invention with reference to a simplified embodiment example
Figur 1 zeigt in Seitenansicht eine Gesamtansicht einer FilmpresseFigure 1 shows a side view of an overall view of a film press
Figur 2 zeigt als Prinzipsskizze die Anordnung und Wirkungsweise der Druckfeder zwischen den Preßwalzen Figur 3 zeigt als Seitenansicht einen Ausschnitt einer Vorrichtung, bei der die Gegenkraft einstellbar istFigure 2 shows a schematic diagram of the arrangement and operation of the compression spring between the press rolls Figure 3 shows a side view of a section of a device in which the counterforce is adjustable
Wege zur Ausführung der ErfindungWays of Carrying Out the Invention
Die in Figur 1 dargestellte Beschichtungsvornchtung ist in eine Papiermaschine integriert Sie besteht aus zwei achsparallel nebeneinander in einem Gestell 1 drehbar gelagerten Preßwalzen 2, 3, von denen eine Preßwalze 2 ortsfest, die andere Preßwalze 3 umfänglich gegen die erste Preßwalze 2 anpressbar gelagert ist Die bewegbare Preßwalze 3 ist zwischen zwei seitlichen Schwenkhebeln 4 aufgehängt, die mittels einer hydraulischen Kolben-Zylinder-Einheit als Stellelement 5 um eine Schwenkachse 6 in Richtung zur Preßwalze 2 und von dieser weg schwenkbar im Gestell 1 gelagert sind Mittels des Stellelements 5 laßt sich so die Preßwalze 3 umfänglich gegen die Preßwalze 2 drucken Alternativ kann auch eine pneumatische Kolben-Zylinder-Einheit als Stellelement 5 eingesetzt werden Ebenso kann ein Pneumatikbalg ohne Kolben als Stellelement 5 verwendet werden, wie in Figur 2 dargestellt ist Beim Anschwenken der Preßwalze 3 gegen die Preßwalze 2 bildet sich ein Preßspalt 7, dem die zu beschichtene Papierbahn 8 von einer Leitrolle 9 von oben zugeführt wird Bevorzugt sind die beiden Preßwalzen 2, 3 auf ihrer Mantelflache gummiertThe coating device shown in FIG. 1 is integrated in a paper machine.It consists of two press rolls 2, 3 which are rotatably mounted axially parallel to one another in a frame 1, one of which press roll 2 is stationary, the other press roll 3 is circumferentially pressable against the first press roll 2 Press roller 3 is suspended between two lateral pivot levers 4, which are mounted in the frame 1 by means of a hydraulic piston-cylinder unit as an actuating element 5 about a pivot axis 6 in the direction of the press roller 2 and can be pivoted away therefrom 3 print circumferentially against the press roller 2 Alternatively, a pneumatic piston-cylinder unit can also be used as the actuating element 5. A pneumatic bellows without piston can also be used as the actuating element 5, as shown in FIG. 2, when the press roller 3 swivels against the press roller 2 there is a press nip 7 to which the Coated paper web 8 is fed from above by a guide roller 9. The two press rollers 2, 3 are preferably rubberized on their outer surface
Bei der in der Zeichnung dargestellten Vorrichtung zum beidseitigen Beschichten wird dem Preßspalt 7 Beschichtungsmaterial an der Einlaufseite der Bahn 8 für beide Bahnseiten zugeführt Dazu ist außerhalb des Bereichs des Preßspalts 7 an jeder Preßwalze 2, 3 ein Auftrag- und Dosiersystem 10, 11 angeordnet, das an die jeweilige Preßwalze 2, 3 anschwenkbar ist Bevorzugt weist jedes Auftrag- und Dosiersystem 10, 11 eine zur jeweiligen Preßwalze 2, 3 hin offene Auftragkammer auf, in die Beschichtungsmaterial unter Druck zugeführt wird Auslaufseitig wird jede Auftragkammer von einem Dosierelement abgeschlossen, das das auf die Preßwalze 2, 3 aufgetragene Beschichtungsmaterial bis auf die gewünschte Filmdicke abstreift Als Dosierelement wird bevorzugt eine Rakelstange mit strukturierter, also Erhebungen und Vertiefung aufweisender Oberflache eingesetzt, mit der volumetπsch dosiert werden kann Bevorzugt werden Rakelstangen mit Umfangsπllen eingesetzt Das dosiert auf den Mantelflächen der Preßwalzen 2, 3 aufgetragene Beschichtungsmaterial wird im Preßspalt 7 an die Bahn 8 übergeben. Nach dem Durchlaufen des Preßspalts 7 wird die beidseitig beschichtete Bahn 8 von einem berührungslos arbeitenden Leitelement 12 einem nicht dargestellten Trockner zugeführt.In the device for coating on both sides shown in the drawing, coating material 7 is fed to the press nip 7 on the inlet side of the web 8 for both web sides. For this purpose, an application and metering system 10, 11 is arranged on the press nip 7 on each press roll 2, 3 each application and metering system 10, 11 preferably has an application chamber which is open towards the respective press roller 2, 3 and into which coating material is fed under pressure. On the outlet side, each application chamber is closed off by a metering element, which on the press roll 2, 3 applied coating material is stripped down to the desired film thickness. The metering element used is preferably a doctor rod with a structured surface, that is to say elevations and recesses, with which volumetric metering can be used. Doctor rods with circumferential rollers are preferably used The coating material applied in metered fashion on the lateral surfaces of the press rolls 2, 3 is transferred to the web 8 in the press nip 7. After passing through the press nip 7, the web 8 coated on both sides is fed from a non-contact guide element 12 to a dryer, not shown.
Der Liniendruck zwischen den beiden Preßwalzen 2, 3 wird über den hydraulischen oder pneumatischen Druck in dem Stellelement 5 eingestellt, der über ein Proportionalventil variiert werden kann. Um eine einwandfreie Funktion der Vorrichtung zu gewährleisten, ist ein Mindestdruck in dem Stellelement 5 erforderlich. Dieser Mindestdruck ist als Liniendruck zwischen den beiden Preßwalzen 2, 3 für bestimmte Oberflächenbeschichtungen mit Pigmentstreichfarbe zu groß, da zuviel Farbe in die Papier- oder Kartonbahn 8 eingepreßt würde.The line pressure between the two press rolls 2, 3 is set via the hydraulic or pneumatic pressure in the actuating element 5, which can be varied via a proportional valve. In order to ensure proper functioning of the device, a minimum pressure in the control element 5 is required. This minimum pressure is too great as a line pressure between the two press rollers 2, 3 for certain surface coatings with pigment coating ink, since too much ink would be pressed into the paper or cardboard web 8.
Damit der Liniendruck im Preßspalt 7 unter den Mindestdruck für das Stellelement 5 abgesenkt werden kann, ist zwischen den beiden Preßwalzen 2, 3 zumindest eine Druckfeder 13, 14 angeordnet, die im Preßspalt 7 eine die Preßwalzen 2, 3 auseinander drückende Gegenkraft erzeugt. Bevorzugt sind an jeder Längsseite der Vorrichtung jeweils zwei Federn 13, 14 zwischen den Lagergehäusen 15, 16 der Preßwalzen 2, 3 angeordnet, die von einem Distanzbolzen 17 auf einen einstellbaren Abstand gehalten werden. Der Distanzbolzen 17 überträgt die Preßkraft des Stellelements 5 gegen die Kraft der Federn 13, 14 auf die Lagergehäuse 15, 16 und somit auf die Preßwaizen 2,3.So that the line pressure in the press nip 7 can be reduced below the minimum pressure for the actuating element 5, at least one compression spring 13, 14 is arranged between the two press rolls 2, 3, which generates a counterforce pushing the press rolls 2, 3 apart in the press nip 7. Two springs 13, 14 are preferably arranged on each longitudinal side of the device between the bearing housings 15, 16 of the press rolls 2, 3, which are held at an adjustable distance by a spacer bolt 17. The spacer bolt 17 transmits the pressing force of the actuating element 5 against the force of the springs 13, 14 to the bearing housing 15, 16 and thus to the press rollers 2, 3.
Die Federn 13, 14 sind so gestaltet, daß sie eine weitgehend konstante Federkonstante haben, so daß die Gegenkraft linear mit der Abstandsverringerung der beiden Preßwalzen 2, 3 voneinander zunimmt. Im Ausführungsbeispiel nach den Figuren 2 und 3 sind die Federn 13, 14 als sich an dem jeweiligen Lagergehäuse 15, 16 abstützende Blattfedern gestaltet. Sie haben einen Federweg, der ausreicht, in Verbindung mit der Federkonstante einen so großen Gegendruck aufzubauen, daß bei dem erforderlichen Mindestdruck des Stellelements 5 der Liniendruck zwischen den Preßwalzen 2, 3 gegen Null eingestellt werden kann.The springs 13, 14 are designed so that they have a largely constant spring constant, so that the counterforce increases linearly with the distance between the two press rolls 2, 3 from each other. In the exemplary embodiment according to FIGS. 2 and 3, the springs 13, 14 are designed as leaf springs which are supported on the respective bearing housing 15, 16. You have a spring travel, which is sufficient in connection with the spring constant to build up such a large back pressure that the line pressure between the press rolls 2, 3 can be set to zero at the required minimum pressure of the actuating element 5.
Bevorzugt ist die Länge des Distanzbolzen 17 veränderbar, damit die Grundposition eingestellt werden kann, in der die Gegenkraft der Federn 13, 14 wirksam wird. Wie in Figur 3 dargestellt, weist der Distanzbolzen 17 an einer Seite eine Gelenkkugel auf, die in einer außen an der Feder 14 befestigten Gelenkpfanne 18 gelagert ist. Über das entgegengesetzte Ende des Bolzens 17 ist eine Hülse 19 geschraubt, deren axiale Position relativ zum Bolzen 17 verstellt werden kann. Das kugelschalenförmige Ende der Hülse 19 ist ebenfalls in einer Gelenkpfanne gelagert, die an der Außenseite der zweiten Feder 13 befestigt ist. Diese Konstruktion ermöglicht neben der Veränderung der wirksamen Länge des Bolzens 17 eine Schwenkbewegung des Bolzens 17 relativ zu den Lagergehäusen 15, 16, damit die Anschwenkbewegung der Preßwalze 3 gegen die Preßwalze 2 nicht beeinträchtigt wird. Damit der Distanzbolzen 17 beim Abschwenken der Preßwalze 3 nicht abknickt, wird er in der Gelenkpfanne 18 von einem Spannring 20 in seiner Position gehalten. Durch Entfernen des Spannrings 20 kann der Distanzbolzen 17 mit der aufgeschraubten Hülse 19 komplett herausgenommen werden, falls die Vorrichtung ohne Wirkung der Federn 13, 14 betrieben werden soll.The length of the spacer bolt 17 can preferably be changed so that the basic position can be set in which the counterforce of the springs 13, 14 is effective. As shown in FIG. 3, the spacer pin 17 has an articulated ball on one side, which is mounted in an articulated socket 18 fastened to the spring 14 on the outside. About the opposite end of the bolt 17 is a sleeve 19 screwed, the axial position of which can be adjusted relative to the bolt 17. The spherical shell-shaped end of the sleeve 19 is also mounted in a joint socket which is fastened to the outside of the second spring 13. In addition to changing the effective length of the bolt 17, this construction enables a pivoting movement of the bolt 17 relative to the bearing housings 15, 16, so that the pivoting movement of the press roll 3 against the press roll 2 is not impaired. So that the spacer bolt 17 does not bend when the press roll 3 is pivoted away, it is held in its position in the socket 18 by a clamping ring 20. By removing the clamping ring 20, the spacer 17 with the screwed-on sleeve 19 can be completely removed if the device is to be operated without the action of the springs 13, 14.
Vor dem erstmaligen Betrieb der Vorrichtung und nach jedem Waizenwechsel wird zunächst als Grundeinstellung die wirksame Länge des Distanzbolzens 17 so eingestellt, das die Preßwalze 2, 3 bei dem für das Stellelement 5 erforderlichen Mindestdruck den Abstand 0 Millimeter zueinander haben. Der für eine optimale Beschichtung erforderliche Liniendruck zwischen den Preßwalzen 2, 3 wird anschließend durch Erhöhung des Drucks in dem Stellelement 5 eingestellt. Der Druck des Stellelements 5 wird so variiert, daß die beiden Preßwalzen 2,3 an jeder Längsseite den gleichen Abstand voneinander haben und so die Linienkraft über die gesamte axiale Länge beider Preßwalzen 2, 3 gleichmäßig ist. Before the device is operated for the first time and after each change of waizen, the effective length of the spacer bolt 17 is set as a basic setting so that the press roll 2, 3 are at a distance of 0 millimeters from one another at the minimum pressure required for the actuating element 5. The line pressure required for optimal coating between the press rolls 2, 3 is then set by increasing the pressure in the actuating element 5. The pressure of the actuating element 5 is varied such that the two press rolls 2, 3 are at the same distance from one another on each longitudinal side, and so the line force is uniform over the entire axial length of both press rolls 2, 3.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1.1.
Vorrichtung zum Beschichten einer Materialbahn (8), insbesondere einer Papier- oderDevice for coating a material web (8), in particular a paper or
Kartonbahn,Board web,
- mit zwei achsparallel nebeneinander in einem Gestell (4) gelagerten Preßwalzen (2, 3), von denen eine Preßwalze (3) mittels eines Stellelements (5) gegen die andere Preßwalze (2) umfänglich andrückbar ist, um einen Preßspalt (7) zu bilden, durch den die Materialbahn (8) geführt wird, und- With two axially parallel side by side in a frame (4) mounted press rolls (2, 3), of which a press roll (3) by means of an adjusting element (5) against the other press roll (2) can be pressed extensively to a press nip (7) form, through which the material web (8) is guided, and
- mit einem Auftrag- und Dosiersystem (10, 11 ) für zumindest eine Preßwalze (2, 3),- With an application and metering system (10, 11) for at least one press roll (2, 3),
dadurch gekennzeichnet, daß zwischen den beiden Preßwalzen (2, 3) eine Druckfeder (13, 14) angeordnet ist, die im Preßspalt (7) eine die Preßwalzen (2, 3) auseinander drückende Gegenkraft erzeugt.characterized in that a compression spring (13, 14) is arranged between the two press rolls (2, 3) and generates a counterforce pushing the press rolls (2, 3) apart in the press nip (7).
2.Second
Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß die Feder (13, 14) an der Längsseite der Vorrichtung zwischen den Lagergehäusen (15, 16) der Preßwalzen (2, 3) angeordnet ist.Device according to claim 1, characterized in that the spring (13, 14) is arranged on the longitudinal side of the device between the bearing housings (15, 16) of the press rolls (2, 3).
3.Third
Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß ein Distanzbolzen (17) mit veränderbarer Länge die Preßkraft des Stellelements (5) gegen die Kraft der Feder (13, 14) auf die Preßwalzen (2, 3) überträgt.Apparatus according to claim 1 or 2, characterized in that a spacer bolt (17) with variable length transmits the pressing force of the actuating element (5) against the force of the spring (13, 14) to the press rollers (2, 3).
4.4th
Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Distanzbolzen (17) an seinen Enden gelenkig gelagert ist. Device according to claim 3, characterized in that the spacer bolt (17) is articulated at its ends.
5.5th
Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Distanzbolzen (17) zwischen zwei Federn (13, 14) angeordnet ist, die sich jeweils an einem Lagergehäuse (15, 16) einer Preßwalze (2, 3) abstützen.Apparatus according to claim 3 or 4, characterized in that the spacer bolt (17) is arranged between two springs (13, 14), each of which is supported on a bearing housing (15, 16) of a press roller (2, 3).
6.6th
Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß dasDevice according to one of claims 1 to 5, characterized in that the
Stellelement (5) eine hydraulische Kolben-Zylinder-Einheit oder eine Pheumatikbalg ist. Control element (5) is a hydraulic piston-cylinder unit or a pheumatic bellows.
PCT/EP2001/002420 2000-03-15 2001-03-03 Device for coating a material web, especially paper or cardboard web WO2001068269A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10012465.8 2000-03-15
DE2000112465 DE10012465A1 (en) 2000-03-15 2000-03-15 Assembly for coating the surfaces of a paper/cardboard web at the papermaking machine has a setting unit to act on the press rollers against their springs to give a low linear pressure in the press gap

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US3805738A (en) * 1970-11-04 1974-04-23 N Kitazawa Oiling device for metal sheet
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US8529836B2 (en) 2002-12-20 2013-09-10 Dako Denmark A/S Apparatus for automated processing biological samples
US7758809B2 (en) 2002-12-20 2010-07-20 Dako Cytomation Denmark A/S Method and system for pretreatment of tissue slides
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US7937228B2 (en) 2002-12-20 2011-05-03 Dako Denmark A/S Information notification sample processing system and methods of biological slide processing
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US8216512B2 (en) 2002-12-20 2012-07-10 Dako Denmark A/S Apparatus for automated processing biological samples
US8257968B2 (en) 2002-12-20 2012-09-04 Dako Denmark A/S Method and apparatus for automatic staining of tissue samples
US8298815B2 (en) 2002-12-20 2012-10-30 Dako Denmark A/S Systems and methods of sample processing and temperature control
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US8394635B2 (en) 2002-12-20 2013-03-12 Dako Denmark A/S Enhanced scheduling sample processing system and methods of biological slide processing
US10156580B2 (en) 2002-12-20 2018-12-18 Dako Denmark A/S Information notification sample processing system and methods of biological slide processing
US7648678B2 (en) 2002-12-20 2010-01-19 Dako Denmark A/S Method and system for pretreatment of tissue slides
US8386195B2 (en) 2002-12-20 2013-02-26 Dako Denmark A/S Information notification sample processing system and methods of biological slide processing
US8784735B2 (en) 2002-12-20 2014-07-22 Dako Denmark A/S Apparatus for automated processing biological samples
US8788217B2 (en) 2002-12-20 2014-07-22 Dako Denmark A/S Information notification sample processing system and methods of biological slide processing
US8969086B2 (en) 2002-12-20 2015-03-03 Dako Denmark A/S Enhanced scheduling sample processing system and methods of biological slide processing
US9229016B2 (en) 2002-12-20 2016-01-05 Dako Denmark A/S Information notification sample processing system and methods of biological slide processing
US9778273B2 (en) 2002-12-20 2017-10-03 Dako Denmark A/S Isolated communication sample processing system and methods of biological slide processing
US9599630B2 (en) 2002-12-20 2017-03-21 Dako Denmark A/S Method and apparatus for automatic staining of tissue samples
EP3088308A1 (en) * 2005-11-25 2016-11-02 Focke & Co. (GmbH & Co. KG) Method and device for producing blanks for an inner wrapper of a cigarette group
EP1954568A1 (en) 2005-11-25 2008-08-13 Focke & Co. (GmbH & Co. KG) Method of, and apparatus for, producing blanks for an inner wrapper of a cigarette group
CN110355043A (en) * 2019-08-01 2019-10-22 天津碧水源膜材料有限公司 A kind of coating roller arrangement for roll coater

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