EP1831465B1 - Device for applying a coating material to a paper web - Google Patents

Device for applying a coating material to a paper web Download PDF

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Publication number
EP1831465B1
EP1831465B1 EP05849247.1A EP05849247A EP1831465B1 EP 1831465 B1 EP1831465 B1 EP 1831465B1 EP 05849247 A EP05849247 A EP 05849247A EP 1831465 B1 EP1831465 B1 EP 1831465B1
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EP
European Patent Office
Prior art keywords
paper web
roller
metering
limiting element
deflection roller
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.)
Not-in-force
Application number
EP05849247.1A
Other languages
German (de)
French (fr)
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EP1831465A1 (en
Inventor
Walter Müller
Heinrich Kuschnik
Udo Unger
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.)
Vits Technology GmbH
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Vits Technology GmbH
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Publication date
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Publication of EP1831465A1 publication Critical patent/EP1831465A1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
    • 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
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • D21H23/40—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper only one side of the paper being in contact with the material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/18—Paper- or board-based structures for surface covering
    • D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
    • D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
    • D21H27/28—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures treated to obtain specific resistance properties, e.g. against wear or weather
    • 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • the invention relates to a device for applying a consisting of liquid resin and fine-grained abrasive material coating composition on a continuous pre-impregnated paper web according to the preamble of claim 1.
  • abrasive material is z. B. corundum used.
  • the problem with the use of such a coating composition is the tendency of the corundum particles to settle, d. H. the tendency of the coating mass to segregate.
  • the DE 195 08 797 C describes a method for producing decorative paper for abrasion resistant laminates.
  • a viscous mixture of melamine resin, corundum particles and alpha-cellulose is applied as a coating mass on the visible surface of a decorative paper.
  • the alpha-cellulose serves as a stiffening and suspending agent.
  • the corundum particles have a particle size of 15 to 50 microns.
  • the application rate is 80 to 200 g / m 2 , so that after drying results in a layer thickness of 20 to 65 microns.
  • the coating composition is applied by means of a wire bar, an anilox roll or a reverse coating system. It has been found that the components of such application systems which come into contact with the coating composition are worn by the abrasive corundum particles within a very short time.
  • a generic device for applying a coating composition to a pre-impregnated with resin, possibly even dried paper web, in which an application unit also has a slot nozzle is from the EP 1 084 298 B known.
  • This device is provided with a guide roller on which the paper web in a wrap region, and a metering roller, which is arranged parallel to the guide roller and includes a narrow gap with it.
  • the slot nozzle is arranged on the deflection roller or on the metering roller.
  • a method for impregnating decorative paper in which a layer of an amino resin treatment material with particulate abrasion material is applied to impregnated, wet decorative paper, is known from US Pat EP 1 068 394 B known. Also in this document it is pointed out that by the nozzle principle, in which the treatment mass with z. B. corundum particles is circulated and moved uniformly, settling phenomena are not observed. It can be dispensed with the admixture of viscosity-increasing substances.
  • the particulate abrasive material alumina and / or silicon carbide having a grain size of 60 to 160 ⁇ m can be used.
  • the GB 2 178 677 A discloses a device for coating webs, in which the web is guided around a deflection roller. On the web coating agent is applied by means of an applicator roll in excess. The applicator roll is arranged vertically below the deflection roller and forms with it a gap in which the coating agent is applied to the web. The applicator roll is associated with a guide plate which forms a channel with the applicator roll. For metering the coating agent, two metering devices are arranged one after the other behind the gap. The device is not suitable for applying coating materials containing abrasive material
  • the object of the invention is to develop a device for applying a coating composition to a continuous paper web according to the preamble of claim 1, in which segregation of the coating composition is avoided and complete wetting of the paper web is ensured and in which work is carried out with a slight excess of coating composition can.
  • the device should be less susceptible to wear.
  • the application unit of the device has a delimiting element which is arranged in the web running direction in front of the nip and extends below the nip, by which a gusset for receiving the coating mass is formed between the deflecting roller and the delimiting element.
  • a gusset for receiving the coating mass is formed between the deflecting roller and the delimiting element.
  • the gusset is the Filled coating.
  • the coating composition is received, dragged to the gap between the metering roller and the guide roller and adjusted at the exit of the gap to the desired amount, wherein a portion of the coating material is returned from the metering to the gap and the remaining part as Layer remains on the paper web.
  • only about a 1 to 3-fold excess of coating material from the gusset is taken up by the paper web.
  • the amount of coating composition is less than the amount adhered during the jetting and substantially less than the amount leaving a slot nozzle. The excess is jammed in front of the gap and can flow back into the gusset.
  • the inclusion of the coating composition in the gusset which is similar to a passage of the paper web through a supply of coating composition, ensures in a simple manner complete wetting of the paper web.
  • gusset only a slightly higher than the required amount of the coating composition can be dosed.
  • containers, lines and the circulation pump can be made smaller.
  • the investment and energy requirements are reduced.
  • the gusset forming limiting element is a very simple component and can optionally be easily replaced.
  • the coating mass is inevitably mixed by the movement of the paper web.
  • a possibly occurring, slight settling of the corundum particles in the gusset leads rather to an accumulation of the coating mass of corundum particles taken up by the paper web than to an impoverishment.
  • the reason for this is that corundum particles possibly settling in the gusset move onto the paper web.
  • a particular advantage of a device according to the invention is that it is versatile because of its simplicity. It is suitable for impregnating decor paper and also for impregnating overlay paper.
  • the paper web to be coated can by applying resin and dosing the amount of resin z. B. with metering or z. B. a squeegee and then directly the wet paper web are provided with coating material.
  • a prepreg paper web may be dried prior to application of coating composition.
  • viscosity-increasing substances such as, for example, can be used.
  • B. alpha-cellulose can be dispensed with.
  • such substances can also be added without problems.
  • As abrasive material all known particles can be used, for. As abrasive particles of alumina and / or silicon carbide with a particle size of 15 to 200 microns.
  • the thickness of the coating can be 20 to 250 ⁇ m.
  • the limiting element may according to claim 3 alternatively at its lower end to the paper web a narrow gap of z. B. 0.05 to 1 mm.
  • the coating material is taken out of the gap by the paper web up to a certain gap width, so that it does not flow through the gap.
  • a complete take is z. B. at a web speed of 60 m / min up to a gap width of about 0.3 mm.
  • For larger gap widths of z. B. 0.3 to 1 mm is a constant low flow through the gusset of coating material and thus allows a certain circulation.
  • the limiting element is designed as a largely planar, at an acute angle to the vertical component, and thus as a simple component, and arranged in front of the guide roller.
  • the metering roller can be arranged offset in height relative to the guide roller according to claim 5. This allows easy attachment of the limiting element.
  • the metering roller and the guide roller according to claim 6 form drivable opposite, allows for both rollers a movement in the web running direction and thus a dosing of the coating material with low risk of wear of the rollers.
  • the metering roller and the guide roller may be designed to be drivable in the same direction. This makes it possible to smooth the surface of the recorded layer by the metering roller rolling counter to the direction of web travel.
  • the metering roller according to claim 8 downstream of a smoothing unit allows smoothing of the surface of the recorded layer and is particularly in a metering roll, which rolls according to claim 6 in the direction of paper travel and from which tears off the remaining on the paper web, advantage.
  • FIGURE shows a device according to the invention for applying coating material to a paper web.
  • a device for applying a coating composition consisting of liquid resin and fine-grained abrasive material to a preimpregnated paper web 1 has a deflection roller 2, a metering roller 3 and an application unit.
  • the paper web 1 is fed according to the figure in the horizontal direction of the guide roller 2 and is applied to this in a wrap, and that in the range of an arc of 180 °. Then it is in the horizontal direction, as symbolized by an arrow A, led to a dryer, not shown.
  • the guide roller 2 is rotatably mounted with a horizontal axis in a machine frame, not shown.
  • the metering roller 3 is rotatably mounted in the machine frame, that the axes of rotation of the guide roller 2 and the metering roller 3 are parallel and between them a narrow gap 4 is formed.
  • the width of this gap 4 is z. B. 0.05 to 0.5 mm.
  • the axis of rotation of the metering roller 3 is higher than that of the deflection roller 2, d. H.
  • the metering roller 3 is arranged at a height offset from the guide roller 2.
  • the bearing of one of the rollers 2, 3 is displaceable parallel to a connecting line of its axes of rotation, so that a width of the narrow gap 4 between the rollers 2, 3 is variable.
  • the metering roller 3 is provided with a smooth roll shell.
  • the guide roller 2 and the metering roller 3 are each connected to a drive so that their directions of rotation arrows B and C are in the same direction with the web running direction of the paper web 1. Ie. the two rollers 2, 3 themselves are driven in opposite directions.
  • the drives of the two rollers 2, 3 are mechanically or electrically coupled so that the rollers 2, 3 rotate synchronously or approximately synchronously.
  • the application unit has a limiting element 5, which is arranged below the metering roller 3 so that between the guide roller 2 and the limiting element 5, a gusset 6 is formed.
  • the limiting element 5 is formed as a substantially planar component and extends parallel to the guide roller 2.
  • the limiting element 5 is a metal z. B. made of stainless steel, flat sheet metal, which is arranged at an acute angle to the vertical in the wrapping area in front of the guide roller 2. The lower end of the limiting element 5 is guided so close to the jacket of the guide roller 2 that it touches the paper web 1 and thus seals the gusset 6 down.
  • the limiting element 5 extends by a length of at least a few millimeters beyond the line of contact with the paper web 1 downwards, d. H. it is tangent to the paper web 1 on.
  • the gusset 6 is open.
  • the application unit further has a supply line 7 for the coating composition and a manifold 8, in which the supply line 7 opens.
  • the also parallel to the guide roller 2 extending manifold 8 is located in the upper region of the gusset 6 and is provided on its underside with spaced holes.
  • the application unit additionally comprises a collecting trough 9 arranged underneath the deflecting roller 2, as well as means, not shown, of a circulating system for the coating compound with a storage container, a pump and lines to which the collecting trough 9 and the supply line 7 are connected. Possibly. a bypass arrangement to the gusset 6 is provided.
  • a smoothing unit with a parallel to the guide roller 2 extending retaining strip 10 and a rectangular lobes 11 of flexible, rubbery material is arranged.
  • the tab 11 is attached to the rear edge of the retaining strip 10 so that a strip-shaped part of the tab 11 loosely rests on the top of the running of the guide roller 1 paper web 1.
  • the tab 11 extends over the entire width of the paper web 1.
  • the paper web 1 is at a web speed between about 10 to 70 m / min, z. B. of 50 m / min, the guide roller 2 supplied in a horizontal direction from below, led to the guide roller 2 and further approximately horizontally in the direction of arrow A of the dryer.
  • the coating composition is metered through the supply line 7 and the manifold 8, which contains homogeneously distributed the abrasion-resistant particles.
  • the coating composition is largely uniformly distributed over the width of the paper web 1.
  • the amount supplied corresponds at least and as exactly as possible to the predetermined desired quantity corresponding to a selected coating thickness. If necessary, small amounts of excess coating material flow over the open sides of the gusset 6, are collected in the sump 9 and returned to the reservoir.
  • the paper web 1 takes from the gusset 6, the coating composition.
  • the inclusion of the coating composition takes place with a 1 to 3-fold excess, ie with a substantially lower excess than in a spraying of the paper web 1.
  • the on the paper web. 1 adhere adhering coating mass.
  • Excess coating composition, and indeed retained in front of the gap 4 and carried by the metering roller 3 coating mass accumulates in front of the gap 4 and flows back into the gusset 6. A small portion of the coating mass entrained by the metering roller 3 can drip into the trough 9 and be circulated with the remaining coating compound.
  • a portion of the coating composition may be circulated through the bypass arrangement such that the total amount circulated may be three to ten times greater than the amount required. Also, this circulated amount is much lower than the amount that is necessary when using slot nozzles.
  • the tearing off of the coating 1 adhering to the paper web 1 from the surface of the metering roller 3 at the exit of the gap 4 can lead to slight unevenness of the layer, for. B. to longitudinal stripes lead. These are smoothed by the following, resting on the surface of the layer of flaps 11.
  • the thus coated paper web 1 is then dried in the dryer to a predetermined residual moisture and then z. B. wound on a roll or cut into sheets.
  • the supply line 7 and the manifold 8 can be replaced by a plurality of supply lines, which open at a distance from each other in the upper region of the gusset 6.
  • the limiting element 5 is arranged so that it forms a narrow gap of 0.05 to 1 mm with the paper web 1.
  • the gusset 6 may be closed by lateral sheets on the sides. In operation, a small amount of coating material continuously flows through this gap of the gusset 6 and drips into the sump 9.
  • the drives of the deflection roller 2 and the metering roller 3 are connected so that the direction of rotation of the metering roller 3 is in opposite directions to that of the guide roller 2 and to the web running direction. Since, in this embodiment, the metering roller 3 smoothes the surface of the layer, the smoothing unit can optionally be dispensed with.
  • the limiting element 5 and possibly elements on the sides of plastic z. B. be made of Teflon.

Description

Die Erfindung betrifft eine Vorrichtung zum Auftragen einer aus flüssigem Harz und feinkörnigem abrasivem Material bestehenden Beschichtungsmasse auf eine durchlaufende vorimprägnierte Papierbahn gemäß dem Oberbegriff des Anspruchs 1. Als abrasives Material wird z. B. Korund eingesetzt. Problematisch bei der Verwendung einer derartigen Beschichtungsmasse ist die Tendenz der Korundpartikel sich abzusetzen, d. h. die Tendenz der Beschichtungsmasse sich zu entmischen.The invention relates to a device for applying a consisting of liquid resin and fine-grained abrasive material coating composition on a continuous pre-impregnated paper web according to the preamble of claim 1. As abrasive material is z. B. corundum used. The problem with the use of such a coating composition is the tendency of the corundum particles to settle, d. H. the tendency of the coating mass to segregate.

Die DE 195 08 797 C beschreibt ein Verfahren zur Herstellung von Dekorpapier für abriebfeste Laminate. Dabei wird ein viskoses Gemisch aus Melaminharz, Korundpartikeln und Alpha-Zellulose als Beschichtungsmasse auf die Sichtfläche eines Dekorpapiers aufgetragen. Die Alpha-Zellulose dient dabei als Versteifungs- und Suspendierungsmittel. Die Korundpartikel haben eine Korngröße von 15 bis 50 µm. Die Auftragmenge beträgt 80 bis 200 g/m2, so dass sich nach dem Trocknen eine Schichtdicke von 20 bis 65 µm ergibt. Die Beschichtungsmasse wird mittels einer Drahtrakel, einer Rasterwalze oder eines Reverscoatingsystems aufgetragen. Hierbei hat sich gezeigt, dass die mit der Beschichtungsmasse in Berührung kommenden Bauteile derartiger Auftragsysteme durch die abrasiven Korundpartikel innerhalb kürzester Zeit verschlissen sind.The DE 195 08 797 C describes a method for producing decorative paper for abrasion resistant laminates. In this case, a viscous mixture of melamine resin, corundum particles and alpha-cellulose is applied as a coating mass on the visible surface of a decorative paper. The alpha-cellulose serves as a stiffening and suspending agent. The corundum particles have a particle size of 15 to 50 microns. The application rate is 80 to 200 g / m 2 , so that after drying results in a layer thickness of 20 to 65 microns. The coating composition is applied by means of a wire bar, an anilox roll or a reverse coating system. It has been found that the components of such application systems which come into contact with the coating composition are worn by the abrasive corundum particles within a very short time.

Zur Vermeidung von übermäßigem Verschleiß ist aus der DE 196 43 742 A bekannt, zum Auftragen einer Beschichtungsmasse mit feinkörnigem abrasivem Material eine Schlitzdüse einzusetzen. Dabei wird die Beschichtungsmasse als dünner Schleier im Überschuss auf die Papierbahn aufgebracht. Bei der in der DE 196 43 742 beschriebenen Vorrichtung ist eine Entmischung durch Sedimentation des feinkörnigen Materials ausgeschlossen.To avoid excessive wear is out of the DE 196 43 742 A known to use a slot nozzle for applying a coating composition with fine-grained abrasive material. The coating composition is applied as a thin veil in excess to the paper web. When in the DE 196 43 742 described device segregation by sedimentation of the fine-grained material is excluded.

Eine gattungsgemäße Vorrichtung zum Auftragen einer Beschichtungsmasse auf eine mit Harz vorimprägnierte, ggf. auch schon getrocknete Papierbahn, bei der eine Auftragseinheit ebenfalls eine Schlitzdüse aufweist, ist aus der EP 1 084 298 B bekannt. Diese Vorrichtung ist mit einer Umlenkwalze, an der die Papierbahn in einem Umschlingungsbereich anliegt, und einer Dosierwalze, die parallel zur Umlenkwalze angeordnet ist und mit ihr einen engen Spalt einschließt, versehen. Die Schlitzdüse ist an der Umlenkwalze oder an der Dosierwalze angeordnet.A generic device for applying a coating composition to a pre-impregnated with resin, possibly even dried paper web, in which an application unit also has a slot nozzle, is from the EP 1 084 298 B known. This device is provided with a guide roller on which the paper web in a wrap region, and a metering roller, which is arranged parallel to the guide roller and includes a narrow gap with it. The slot nozzle is arranged on the deflection roller or on the metering roller.

Ein Verfahren zum Imprägnieren von Dekorpapieren, bei dem auf imprägniertes, nasses Dekorpapier eine Schicht aus einer Behandlungsmasse aus Aminoharz mit partikelförmigem Abriebmaterial aufgedüst wird, ist aus der EP 1 068 394 B bekannt. Auch in dieser Schrift wird darauf hingewiesen, dass durch das Düsenprinzip, bei dem die Behandlungsmasse mit z. B. Korundpartikeln umgewälzt und gleichförmig bewegt wird, Absetzerscheinungen nicht festzustellen sind. Es kann auf die Beimischung viskositätserhöhender Stoffe verzichtet werden. Als partikelförmiges Abriebmaterial kann Aluminiumoxid und/oder Siliciumkarbid mit einer Korngröße von 60 bis 160 µm verwendet werden.A method for impregnating decorative paper, in which a layer of an amino resin treatment material with particulate abrasion material is applied to impregnated, wet decorative paper, is known from US Pat EP 1 068 394 B known. Also in this document it is pointed out that by the nozzle principle, in which the treatment mass with z. B. corundum particles is circulated and moved uniformly, settling phenomena are not observed. It can be dispensed with the admixture of viscosity-increasing substances. As the particulate abrasive material, alumina and / or silicon carbide having a grain size of 60 to 160 μm can be used.

Bei dem Einsatz von Düsen müssen, wie z. B. in der DE 196 43 742 A beschrieben, Maßnahmen zur Vermeidung einer Entmischung der Behandlungsmasse ergriffen werden. Desweiteren ist es beim Auftragen der Beschichtungsmasse durch eine Düse problematisch, eine vollständige Benetzung der Papierbahn zu gewährleisten. Daher wird beim Einsatz einer Düse die Beschichtungsmasse mit einem großen Überschuss, und zwar mit einer 10 bis 50-fach größeren Menge als für die gewünschte Schichtdicke erforderlich, auf die Papierbahn gedüst. Von der aufgedüsten Beschichtungsmasse strömt ein großer Teil direkt in eine Auffangwanne zurück. Entsprechend groß muß das Umwälzsystem ausgelegt sein und entsprechend hoch sind Investitions- und Energiekosten.When using nozzles must such. B. in the DE 196 43 742 A described measures are taken to prevent segregation of the treatment mass. Furthermore, it is problematic when applying the coating composition through a nozzle to ensure complete wetting of the paper web. Therefore, when using a die, the coating composition is sprayed onto the paper web with a large excess, and with a 10 to 50-fold greater amount than required for the desired layer thickness. From the dosed coating mass, a large part flows directly back into a drip pan. Accordingly large, the circulation system must be designed and correspondingly high investment and energy costs.

Die GB 2 178 677 A offenbart eine Vorrichtung zum Beschichten von Bahnen, bei der die Bahn um eine Umlenkwalze geführt ist. Auf die Bahn wird Beschichtungsmittel mittels einer Auftragswalze im Überschuss aufgetragen. Die Auftragswalze ist senkrecht unter der Umlenkwalze angeordnet und bildet mit dieser einen Spalt, in dem das Beschichtungsmittel auf die Bahn aufgetragen wird. Der Auftragswalze ist eine Führungsplatte zugeordnet, die mit der Auftragswalze einen Kanal bildet. Zum Dosieren des Beschichtungsmittels sind zwei Dosiervorrichtungen nacheinander hinter dem Spalt angeordnet. Die Vorrichtung ist nicht zum Auftragen von Beschichtungsmitteln geeignet, das abrasives Material enthältThe GB 2 178 677 A discloses a device for coating webs, in which the web is guided around a deflection roller. On the web coating agent is applied by means of an applicator roll in excess. The applicator roll is arranged vertically below the deflection roller and forms with it a gap in which the coating agent is applied to the web. The applicator roll is associated with a guide plate which forms a channel with the applicator roll. For metering the coating agent, two metering devices are arranged one after the other behind the gap. The device is not suitable for applying coating materials containing abrasive material

Aufgabe der Erfindung ist es, eine Vorrichtung zum Auftragen einer Beschichtungsmasse auf eine durchlaufende Papierbahn gemäß dem Oberbegriff des Anspruchs 1 zu entwickeln, bei der eine Entmischung der Beschichtungsmasse vermieden und eine vollständige Benetzung der Papierbahn gewährleistet wird und bei der mit geringem Überschuss an Beschichtungsmasse gearbeitet werden kann. Außerdem soll die Vorrichtung wenig anfällig für Verschleiß sein.The object of the invention is to develop a device for applying a coating composition to a continuous paper web according to the preamble of claim 1, in which segregation of the coating composition is avoided and complete wetting of the paper web is ensured and in which work is carried out with a slight excess of coating composition can. In addition, the device should be less susceptible to wear.

Die Aufgabe ist durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.The object is solved by the characterizing features of claim 1.

Erfindungsgemäß weist die Auftragseinheit der Vorrichtung ein in Bahnlaufrichtung vor dem Spalt angeordnetes, sich unterhalb des Spaltes erstreckendes Begrenzungselement auf, durch das zwischen der Umlenkwalze und dem Begrenzungselement ein Zwickel zur Aufnahme der Beschichtungsmasse gebildet ist. In diesen Zwickel wird die Beschichtungsmasse gefüllt. Von der durch den Zwickel laufenden Papierbahn wird die Beschichtungsmasse aufgenommen, zu dem Spalt zwischen der Dosierwalze und der Umlenkwalze geschleppt und am Ausgang des Spaltes auf die gewünschte Menge eingestellt, wobei ein Teil der Beschichtungsmasse von der Dosierwalze zum Spalt zurückgeführt wird und der restliche Teil als Schicht auf der Papierbahn verbleibt. Dazu wird von der Papierbahn nur etwa ein 1 bis 3- facher Überschuss an Beschichtungsmasse aus dem Zwickel aufgenommen. Die Menge an Beschichtungsmasse ist geringer als die beim Aufdüsen haften bleibende Menge und wesentlich geringer als die aus einer Schlitzdüse austretende Menge. Der Überschuss wird vor dem Spalt gestaut und kann in den Zwickel zurückfließen.According to the invention, the application unit of the device has a delimiting element which is arranged in the web running direction in front of the nip and extends below the nip, by which a gusset for receiving the coating mass is formed between the deflecting roller and the delimiting element. In this gusset is the Filled coating. From the running through the gusset paper web, the coating composition is received, dragged to the gap between the metering roller and the guide roller and adjusted at the exit of the gap to the desired amount, wherein a portion of the coating material is returned from the metering to the gap and the remaining part as Layer remains on the paper web. For this purpose, only about a 1 to 3-fold excess of coating material from the gusset is taken up by the paper web. The amount of coating composition is less than the amount adhered during the jetting and substantially less than the amount leaving a slot nozzle. The excess is jammed in front of the gap and can flow back into the gusset.

Die Aufnahme der Beschichtungsmasse im Zwickel, die ähnlich wie bei einem Durchlauf der Papierbahn durch einen Vorrat an Beschichtungsmasse erfolgt, stellt auf einfache Weise eine vollständige Benetzung der Papierbahn sicher.The inclusion of the coating composition in the gusset, which is similar to a passage of the paper web through a supply of coating composition, ensures in a simple manner complete wetting of the paper web.

In den Zwickel kann eine nur geringfügig höhere als die benötigte Menge der Beschichtungsmasse dosiert werden. Dadurch können Behälter, Leitungen und die Umwälzpumpe kleiner dimensioniert werden. Der Investitions- und Energiebedarf ist reduziert. Es gibt weiterhin keine beweglichen Bauteile an der Auftragseinheit, die starkem Verschleiß unterliegen würden. Das den Zwickel bildende Begrenzungselement ist ein sehr einfaches Bauteil und kann gegebenenfalls leicht ausgetauscht werden.In the gusset only a slightly higher than the required amount of the coating composition can be dosed. As a result, containers, lines and the circulation pump can be made smaller. The investment and energy requirements are reduced. There are also no moving parts on the job unit that would be subject to heavy wear. The gusset forming limiting element is a very simple component and can optionally be easily replaced.

Im Zwickel wird durch die Bewegung der Papierbahn die Beschichtungsmasse zwangsläufig durchmischt. Ein eventuell auftretendes, geringfügiges Absetzen der Korundpartikel im Zwickel führt eher zu einer Anreicherung der von der Papierbahn aufgenommenen Beschichtungsmasse an Korundpartikeln als zu einer Verarmung. Der Grund dafür ist, dass sich eventuell im Zwickel absetzende Korundpartikel auf die Papierbahn zu bewegen.In the gusset, the coating mass is inevitably mixed by the movement of the paper web. A possibly occurring, slight settling of the corundum particles in the gusset leads rather to an accumulation of the coating mass of corundum particles taken up by the paper web than to an impoverishment. The reason for this is that corundum particles possibly settling in the gusset move onto the paper web.

Besonderer Vorteil einer erfindungsgemäßen Vorrichtung ist, dass sie aufgrund ihrer Einfachheit vielseitig einsetzbar ist. Sie ist zum Imprägnieren von Dekorpapier und auch zum Imprägnieren von Overlaypapier geeignet. Die zu beschichtende Papierbahn kann durch Auftragen von Harz und Dosieren der Harzmenge z. B. mit Dosierwalzen oder z. B. einer Rakel vorimprägniert und direkt anschließend die nasse Papierbahn mit Beschichtungsmasse versehen werden. Alternativ kann eine vorimprägnierte Papierbahn vor dem Auftrag von Beschichtungsmasse getrocknet werden. Bei der Beschichtungsmasse kann auf viskositätserhöhende Stoffe wie z. B. Alpha-Zellulose verzichtet werden. Derartige Stoffe können jedoch auch ohne Probleme beigemengt sein. Als abrasives Material können alle bekannten Partikel verwendet werden, z. B. Abriebpartikel aus Aluminiumoxid und/oder Siliciumcarbid mit Korngröße von 15 bis 200 µm. Die Dicke der Beschichtung kann 20 bis 250 µm betragen.A particular advantage of a device according to the invention is that it is versatile because of its simplicity. It is suitable for impregnating decor paper and also for impregnating overlay paper. The paper web to be coated can by applying resin and dosing the amount of resin z. B. with metering or z. B. a squeegee and then directly the wet paper web are provided with coating material. Alternatively, a prepreg paper web may be dried prior to application of coating composition. In the case of the coating composition, viscosity-increasing substances, such as, for example, can be used. B. alpha-cellulose can be dispensed with. However, such substances can also be added without problems. As abrasive material, all known particles can be used, for. As abrasive particles of alumina and / or silicon carbide with a particle size of 15 to 200 microns. The thickness of the coating can be 20 to 250 μm.

Die Unteransprüche betreffen vorteilhafte Ausgestaltungen der Erfindung.The subclaims relate to advantageous embodiments of the invention.

Das Begrenzungselement an seinem unteren Ende gemäß Anspruch 2 abdichtend gegenüber der Papierbahn anzuordnen, stellt die vollständige Aufnahme der Korundpartikel durch die Papierbahn sicher. Dabei ist von Vorteil, wenn die Seiten des Zwickels offen bleiben, so dass ein gewisser Überschuss der Beschichtungsmasse ablaufen kann. Ein Steuersystem, das die Harzmenge genau der benötigen Menge anpasst, ist nicht erforderlich.To arrange the limiting element at its lower end according to claim 2 sealingly against the paper web, ensures the complete absorption of the corundum particles through the paper web. It is advantageous if the sides of the gusset remain open, so that a certain excess of the coating material can proceed. A control system that adjusts the amount of resin to exactly the amount needed is not required.

Das Begrenzungselement kann gemäß Anspruch 3 alternativ an seinem unteren Ende mit der Papierbahn einen engen Spalt von z. B. 0,05 bis 1 mm bilden. In Abhängigkeit von der Bahngeschwindigkeit wird bis zu einer bestimmten Spaltbreite die Beschichtungsmasse durch die Papierbahn aus dem Spalt mitgenommen, so dass sie nicht durch den Spalt hindurchfließt. Eine vollständige Mitnahme erfolgt z. B. bei einer Bahngeschwindigkeit von 60 m/min bis zu einer Spaltweite von ca. 0,3 mm. Bei größeren Spaltweiten von z. B. 0,3 bis 1 mm wird ein ständiger geringer Durchfluss durch den Zwickel von Beschichtungsmasse und damit ein gewisses Umwälzen ermöglicht.The limiting element may according to claim 3 alternatively at its lower end to the paper web a narrow gap of z. B. 0.05 to 1 mm. Depending on the web speed, the coating material is taken out of the gap by the paper web up to a certain gap width, so that it does not flow through the gap. A complete take is z. B. at a web speed of 60 m / min up to a gap width of about 0.3 mm. For larger gap widths of z. B. 0.3 to 1 mm is a constant low flow through the gusset of coating material and thus allows a certain circulation.

Gemäß Anspruch 4 ist das Begrenzungselement als weitgehend ebenes, in einem spitzen Winkel zur Senkrechten verlaufendes Bauteil, und damit als einfaches Bauteil, ausgebildet und vor der Umlenkwalze angeordnet.According to claim 4, the limiting element is designed as a largely planar, at an acute angle to the vertical component, and thus as a simple component, and arranged in front of the guide roller.

Die Dosierwalze kann gemäß Anspruch 5 gegenüber der Umlenkwalze höhenversetzt angeordnet sein. Dies ermöglicht eine einfache Anbringung des Begrenzungselements.The metering roller can be arranged offset in height relative to the guide roller according to claim 5. This allows easy attachment of the limiting element.

Die Dosierwalze und die Umlenkwalze gemäß Anspruch 6 gegenläufig antreibbar auszubilden, ermöglicht für beide Walzen eine Bewegung in Bahnlaufrichtung und damit ein Dosieren der Beschichtungsmasse mit geringer Verschleißgefahr der Walzen.The metering roller and the guide roller according to claim 6 form drivable opposite, allows for both rollers a movement in the web running direction and thus a dosing of the coating material with low risk of wear of the rollers.

Alternativ können die Dosierwalze und die Umlenkwalze gemäß Anspruch 7 gleichläufig antreibbar ausgebildet sein. Dies ermöglicht ein Glätten der Oberfläche der aufgenommenen Schicht durch die entgegen der Bahnlaufrichtung abrollende Dosierwalze.Alternatively, the metering roller and the guide roller may be designed to be drivable in the same direction. This makes it possible to smooth the surface of the recorded layer by the metering roller rolling counter to the direction of web travel.

Der Dosierwalze gemäß Anspruch 8 eine Glätteinheit nachzuschalten, ermöglicht ein Glätten der Oberfläche der aufgenommen Schicht und ist besonders bei einer Dosierwalze, die gemäß Anspruch 6 in Papierlaufrichtung abrollt und von der die auf die Papierbahn verbleibende Schicht abreisst, von Vorteil.The metering roller according to claim 8 downstream of a smoothing unit, allows smoothing of the surface of the recorded layer and is particularly in a metering roll, which rolls according to claim 6 in the direction of paper travel and from which tears off the remaining on the paper web, advantage.

Die Erfindung wird anhand eines in der Zeichnung vereinfacht dargestellten Ausführungsbeispiels weiter erläutert. Die einzige Figur zeigt eine erfindungsgemäße Vorrichtung zum Auftragen von Beschichtungsmasse auf eine Papierbahn.The invention will be further explained with reference to an embodiment shown in simplified form in the drawing. The sole FIGURE shows a device according to the invention for applying coating material to a paper web.

Eine erfindungsgemäße Vorrichtung zum Auftragen einer aus flüssigem Harz und feinkörnigem abrasivem Material bestehenden Beschichtungsmasse auf eine vorimprägnierte Papierbahn 1 weist eine Umlenkwalze 2, eine Dosierwalze 3 und eine Auftragseinheit auf. Die Papierbahn 1 ist gemäß der Figur in waagerechter Richtung der Umlenkwalze 2 zugeführt und liegt an dieser in einem Umschlingungsbereich an, und zwar im Bereich eines Bogens von 180°. Anschließend ist sie in waagerechter Richtung, wie durch einen Pfeil A symbolisiert, zu einem nicht dargestellten Trockner geführt.A device according to the invention for applying a coating composition consisting of liquid resin and fine-grained abrasive material to a preimpregnated paper web 1 has a deflection roller 2, a metering roller 3 and an application unit. The paper web 1 is fed according to the figure in the horizontal direction of the guide roller 2 and is applied to this in a wrap, and that in the range of an arc of 180 °. Then it is in the horizontal direction, as symbolized by an arrow A, led to a dryer, not shown.

Die Umlenkwalze 2 ist mit horizontaler Achse drehbar in einem nicht dargestellten Maschinengestell gelagert. Im oberen Teil des Umschlingungsbereichs neben der Umlenkwalze 2 ist die Dosierwalze 3 so drehbar in dem Maschinengestell gelagert, dass die Drehachsen der Umlenkwalze 2 und der Dosierwalze 3 parallel verlaufen und zwischen ihnen ein enger Spalt 4 gebildet ist. Die Weite dieses Spaltes 4 beträgt z. B. 0,05 bis 0,5 mm. Dabei ist die Drehachse der Dosierwalze 3 höher als die der Umlenkwalze 2 angeordnet, d. h. die Dosierwalze 3 ist höhenversetzt zur Umlenkwalze 2 angeordnet. Die Lagerung einer der Walzen 2, 3 ist parallel zu einer Verbindungslinie ihrer Drehachsen verschiebbar, so dass eine Weite des engen Spaltes 4 zwischen den Walzen 2, 3 veränderlich ist. Die Dosierwalze 3 ist mit einem glatten Walzenmantel versehen.The guide roller 2 is rotatably mounted with a horizontal axis in a machine frame, not shown. In the upper part of the belt around the deflection roller 2, the metering roller 3 is rotatably mounted in the machine frame, that the axes of rotation of the guide roller 2 and the metering roller 3 are parallel and between them a narrow gap 4 is formed. The width of this gap 4 is z. B. 0.05 to 0.5 mm. In this case, the axis of rotation of the metering roller 3 is higher than that of the deflection roller 2, d. H. the metering roller 3 is arranged at a height offset from the guide roller 2. The bearing of one of the rollers 2, 3 is displaceable parallel to a connecting line of its axes of rotation, so that a width of the narrow gap 4 between the rollers 2, 3 is variable. The metering roller 3 is provided with a smooth roll shell.

Die Umlenkwalze 2 und die Dosierwalze 3 sind jeweils mit einem Antrieb so verbunden, dass ihre Drehrichtungen Pfeile B und C gleichsinnig mit der Bahnlaufrichtung der Papierbahn 1 sind. D. h. die beiden Walzen 2, 3 selbst sind gegenläufig angetrieben. Die Antriebe der beiden Walzen 2, 3 sind so mechanisch oder elektrisch gekoppelt, dass die Walzen 2, 3 synchron oder annähernd synchron umlaufen.The guide roller 2 and the metering roller 3 are each connected to a drive so that their directions of rotation arrows B and C are in the same direction with the web running direction of the paper web 1. Ie. the two rollers 2, 3 themselves are driven in opposite directions. The drives of the two rollers 2, 3 are mechanically or electrically coupled so that the rollers 2, 3 rotate synchronously or approximately synchronously.

Die Auftragseinheit weist ein Begrenzungselement 5 auf, das unterhalb der Dosierwalze 3 so angeordnet ist, dass zwischen der Umlenkwalze 2 und dem Begrenzungselement 5 ein Zwickel 6 gebildet ist. Dazu ist das Begrenzungselement 5 als ein weitgehend ebenes Bauteil ausgebildet und erstreckt sich parallel zur Umlenkwalze 2. Das Begrenzungselement 5 ist ein aus Metall z. B. aus Edelstahl gefertigtes, ebenes Blech, das in einem spitzen Winkel zur Senkrechten im Umschlingungsbereich vor der Umlenkwalze 2 angeordnet ist. Das untere Ende des Begrenzungselementes 5 ist hierbei so nah an den Mantel der Umlenkwalze 2 geführt, dass es die Papierbahn 1 berührt und so den Zwickel 6 nach unten abdichtet. Dabei erstreckt sich das Begrenzungselement 5 um eine Länge von zumindest einigen Millimetern über die Berührungslinie mit der Papierbahn 1 nach unten hinaus, d. h. es liegt tangential an der Papierbahn 1 an. An den Seiten, d. h. an den beiden Enden des Begrenzungselementes 5 ist der Zwickel 6 offen.The application unit has a limiting element 5, which is arranged below the metering roller 3 so that between the guide roller 2 and the limiting element 5, a gusset 6 is formed. For this purpose, the limiting element 5 is formed as a substantially planar component and extends parallel to the guide roller 2. The limiting element 5 is a metal z. B. made of stainless steel, flat sheet metal, which is arranged at an acute angle to the vertical in the wrapping area in front of the guide roller 2. The lower end of the limiting element 5 is guided so close to the jacket of the guide roller 2 that it touches the paper web 1 and thus seals the gusset 6 down. In this case, the limiting element 5 extends by a length of at least a few millimeters beyond the line of contact with the paper web 1 downwards, d. H. it is tangent to the paper web 1 on. On the sides, d. H. at the two ends of the limiting element 5, the gusset 6 is open.

Die Auftragseinheit weist weiter eine Zufuhrleitung 7 für die Beschichtungsmasse und ein Verteilerrohr 8 auf, in das die Zufuhrleitung 7 mündet. Das sich ebenfalls parallel zur Umlenkwalze 2 erstreckende Verteilerrohr 8 befindet sich im oberen Bereich des Zwickels 6 und ist an seiner Unterseite mit beabstandeten Bohrungen versehen.The application unit further has a supply line 7 for the coating composition and a manifold 8, in which the supply line 7 opens. The also parallel to the guide roller 2 extending manifold 8 is located in the upper region of the gusset 6 and is provided on its underside with spaced holes.

Die Auftragseinheit umfaßt zusätzlich eine unterhalb der Umlenkwalze 2 angeordnete Auffangwanne 9 sowie nicht dargestellte Mittel eines Umwalzsystems für die Beschichtungsmasse mit einem Vorratsbehälter, einer Pumpe und Leitungen, an die die Auffangwanne 9 und die Zufuhrleitung 7 angeschlossen sind. Ggf. ist eine Bypass-Anordnung zum Zwickel 6 vorgesehen.The application unit additionally comprises a collecting trough 9 arranged underneath the deflecting roller 2, as well as means, not shown, of a circulating system for the coating compound with a storage container, a pump and lines to which the collecting trough 9 and the supply line 7 are connected. Possibly. a bypass arrangement to the gusset 6 is provided.

In Bahnlaufrichtung hinter der Dosierwalze 3 oberhalb der Papierbahn 1, in diesem Beispiel oberhalb der Umlenkwalze 2, ist eine Glätteinheit mit einer sich parallel zur Umlenkwalze 2 erstreckenden Halteleiste 10 und einem rechteckigen Lappen 11 aus flexiblem, gummiartigem Material angeordnet. Der Lappen 11 ist an der rückwärtigen Kante der Halteleiste 10 so befestigt, dass ein streifenförmiger Teil des Lappens 11 lose auf der Oberseite der von der Umlenkwalze 1 ablaufenden Papierbahn 1 aufliegt. Der Lappen 11 erstreckt sich über die gesamte Breite der Papierbahn 1. Die Ausbildung der Halteleiste 10 und des Lappens 11 entspricht der in der EP 1 084. 298 B beschriebenen Ausbildung.In the web running direction behind the metering roller 3 above the paper web 1, in this example above the guide roller 2, a smoothing unit with a parallel to the guide roller 2 extending retaining strip 10 and a rectangular lobes 11 of flexible, rubbery material is arranged. The tab 11 is attached to the rear edge of the retaining strip 10 so that a strip-shaped part of the tab 11 loosely rests on the top of the running of the guide roller 1 paper web 1. The tab 11 extends over the entire width of the paper web 1. The formation of the retaining strip 10 and the flap 11 corresponds to that in the EP 1 084. 298 B described training.

Im Betrieb wird die Papierbahn 1 mit einer Bahngeschwindigkeit zwischen etwa 10 bis 70 m/min, z. B. von 50 m/min, der Umlenkwalze 2 in waagerechter Richtung von unten zugeführt, um die Umlenkwalze 2 und weiter in etwa waagerecht in Richtung, Pfeil A des Trockners geführt. In den Zwickel 6 wird durch die Zufuhrleitung 7 und das Verteilerrohr 8 die Beschichtungsmasse dosiert, die homogen verteilt die abriebfesten Partikel enthält. Im Zwickel 6 ist die Beschichtungsmasse weitgehend gleichmäßig über die Breite der Papierbahn 1 verteilt. Die zugeführte Menge entspricht mindestens und möglichst genau der vorbestimmten Sollmenge entsprechend einer gewählten Beschichtungsdicke. Gegebenenfalls geringe Mengen von überschüssiger Beschichtungsmasse fließen über die offenen Seiten des Zwickels 6 ab, werden in der Auffangwanne 9 gesammelt und in den Vorratsbehälter zurückgeführt.In operation, the paper web 1 is at a web speed between about 10 to 70 m / min, z. B. of 50 m / min, the guide roller 2 supplied in a horizontal direction from below, led to the guide roller 2 and further approximately horizontally in the direction of arrow A of the dryer. In the gusset 6, the coating composition is metered through the supply line 7 and the manifold 8, which contains homogeneously distributed the abrasion-resistant particles. In the gusset 6, the coating composition is largely uniformly distributed over the width of the paper web 1. The amount supplied corresponds at least and as exactly as possible to the predetermined desired quantity corresponding to a selected coating thickness. If necessary, small amounts of excess coating material flow over the open sides of the gusset 6, are collected in the sump 9 and returned to the reservoir.

Die Papierbahn 1 nimmt aus dem Zwickel 6 die Beschichtungsmasse auf. Die Aufnahme der Beschichtungsmasse erfolgt mit einem 1 bis 3-fachem Überschuss, d. h. mit einem wesentlich geringerem Überschuss als bei einer Bedüsung der Papierbahn 1. Beim Durchlaufen des engen Spaltes 4, dessen Weite entsprechend der gewünschten Schichtdicke eingestellt ist, wird die auf der Papierbahn 1 haften bleibende Beschichtungsmasse dosiert. Überschüssige Beschichtungsmasse, und zwar vor dem Spalt 4 zurückgehaltene und von der Dosierwalze 3 mitgeführte Beschichtungsmasse, staut sich vor dem Spalt 4 und fließt in den Zwickel 6 zurück. Ein geringer Teil der von der Dosierwalze 3 mitgeführten Beschichtungsmasse kann in die Wanne 9 tropfen und mit der übrigen Beschichtungsmasse umgewälzt werden.The paper web 1 takes from the gusset 6, the coating composition. The inclusion of the coating composition takes place with a 1 to 3-fold excess, ie with a substantially lower excess than in a spraying of the paper web 1. When passing through the narrow gap 4, whose width is set according to the desired layer thickness, the on the paper web. 1 adhere adhering coating mass. Excess coating composition, and indeed retained in front of the gap 4 and carried by the metering roller 3 coating mass accumulates in front of the gap 4 and flows back into the gusset 6. A small portion of the coating mass entrained by the metering roller 3 can drip into the trough 9 and be circulated with the remaining coating compound.

Ggf. kann ein Teil der Beschichtungsmasse über die Bypass-Anordnung umgewälzt werden, so dass die gesamte umgewälzte Menge drei bis zehnmal höher als die benötigte Menge sein kann. Auch diese umgewälzte Menge ist wesentlich geringer als die Menge, die beim Einsatz von Schlitzdüsen notwendig ist.Possibly. For example, a portion of the coating composition may be circulated through the bypass arrangement such that the total amount circulated may be three to ten times greater than the amount required. Also, this circulated amount is much lower than the amount that is necessary when using slot nozzles.

Das Abreißen der auf der Papierbahn 1 haften bleibenden Beschichtungsmasse von der Oberfläche der Dosierwalze 3 am Ausgang des Spaltes 4 kann zu leichten Unebenheiten der Schicht, z. B. zu Längsstreifen, führen. Diese werden durch den nachfolgenden, auf der Oberfläche der Schicht aufliegenden Lappen 11 geglättet.The tearing off of the coating 1 adhering to the paper web 1 from the surface of the metering roller 3 at the exit of the gap 4 can lead to slight unevenness of the layer, for. B. to longitudinal stripes lead. These are smoothed by the following, resting on the surface of the layer of flaps 11.

Die so beschichtete Papierbahn 1 wird dann in dem Trockner auf eine vorbestimmte Restfeuchte getrocknet und anschließend z. B. auf eine Rolle gewickelt oder zu Bogen geschnitten.The thus coated paper web 1 is then dried in the dryer to a predetermined residual moisture and then z. B. wound on a roll or cut into sheets.

Bei einer alternativen Ausführungsform kann die Zufuhrleitung 7 und das Verteilerrohr 8 durch mehrere Zufuhrleitungen ersetzt werden, die beabstandet voneinander in den oberen Bereich des Zwickels 6 münden.In an alternative embodiment, the supply line 7 and the manifold 8 can be replaced by a plurality of supply lines, which open at a distance from each other in the upper region of the gusset 6.

Bei einer weiteren alternativen Ausführungsform ist das Begrenzungselement 5 so angeordnet, dass es mit der Papierbahn 1 einen engen Spalt von 0,05 bis 1 mm bildet. Bei dieser Ausführungsform kann der Zwickel 6 durch seitliche Bleche an den Seiten geschlossen sein. Im Betrieb fließt kontinuierlich eine geringe Menge Beschichtungsmasse durch diesen Spalt des Zwickels 6 und tropft in die Wanne 9.In a further alternative embodiment, the limiting element 5 is arranged so that it forms a narrow gap of 0.05 to 1 mm with the paper web 1. In this embodiment, the gusset 6 may be closed by lateral sheets on the sides. In operation, a small amount of coating material continuously flows through this gap of the gusset 6 and drips into the sump 9.

Bei einer weiteren alternativen Ausführungsform sind die Antriebe der Umlenkwalze 2 und der Dosierwalze 3 so verbunden, dass die Drehrichtung der Dosierwalze 3 gegensinnig ist zu der der Umlenkwalze 2 und zu der der Bahnlaufrichtung. Da bei dieser Ausführungsform die Dosierwalze 3 die Oberfläche der Schicht glättet, kann gegebenenfalls auf die Glätteinheit verzichtet werden.In a further alternative embodiment, the drives of the deflection roller 2 and the metering roller 3 are connected so that the direction of rotation of the metering roller 3 is in opposite directions to that of the guide roller 2 and to the web running direction. Since, in this embodiment, the metering roller 3 smoothes the surface of the layer, the smoothing unit can optionally be dispensed with.

Alternativ können das Begrenzungselement 5 und ggf. Elemente an den Seiten aus Kunststoff z. B. aus Teflon gefertigt sein.Alternatively, the limiting element 5 and possibly elements on the sides of plastic z. B. be made of Teflon.

Claims (8)

  1. Device for applying a coating material composed of liquid resin and abrasive material onto a continuous pre-impregnated paper web (1), which is intended for use in the manufacture of abrasion-resistant laminates, comprising a deflection roller (2) on which the running paper web (1) lies in a wrapping area, with a metering roller (3) that is positioned parallel to the deflection roller (2) and together with the deflection roller defines a narrow gap (4) for metering the coating material, and comprising an applicator which comprises a limiting element (5) which with the deflection roller (2) forms a trough (6) for receiving the coating material which is intended to be applied onto the paper web (1), wherein the limiting element (5) is arranged in web running direction upstream of the gap (4) and underneath the metering roller (3).
  2. Device according to claim 1, characterised in that the limiting element (5) at its lower end is arranged in a sealing manner with respect to the paper web (1).
  3. Device according to claim 1, characterised in that the limiting element (5) at its lower end forms a narrow gap with the paper web (1).
  4. Device according to any one of claims 1 to 3, characterised in that the limiting element is designed as a substantially flat component, and in the wrapping area is oriented at an acute angle with respect to the vertical.
  5. Device according to any one of claims 1 to 4, characterised in that the metering roller (3) is offset in height in relation to the deflection roller (2).
  6. Device according to any one of claims 1 to 5, characterised in that the metering roller (3) and the deflection roller (2) can be driven in opposite directions.
  7. Device according to any one of claims 1 to 5, characterised in that the metering roller (3) and the deflection roller (2) can be driven in the same direction.
  8. Device according to any one of claims 1 to 7, characterised in that a smoothing unit is provided downstream of the metering roller (3).
EP05849247.1A 2004-12-22 2005-12-16 Device for applying a coating material to a paper web Not-in-force EP1831465B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004063043A DE102004063043B3 (en) 2004-12-22 2004-12-22 Apparatus for applying a coating composition to a paper web
PCT/EP2005/013576 WO2006069646A1 (en) 2004-12-22 2005-12-16 Device for applying a coating material to a paper web

Publications (2)

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EP1831465A1 EP1831465A1 (en) 2007-09-12
EP1831465B1 true EP1831465B1 (en) 2016-03-09

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Application Number Title Priority Date Filing Date
EP05849247.1A Not-in-force EP1831465B1 (en) 2004-12-22 2005-12-16 Device for applying a coating material to a paper web

Country Status (5)

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US (1) US20080105197A1 (en)
EP (1) EP1831465B1 (en)
CN (1) CN101065539A (en)
DE (1) DE102004063043B3 (en)
WO (1) WO2006069646A1 (en)

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* Cited by examiner, † Cited by third party
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EP1960602B1 (en) * 2006-12-14 2011-11-02 Grenzebach BSH GmbH Applicator mechanism for applying a highly abrasive coating material to a moving carrier web
DE102008029861A1 (en) * 2008-06-25 2009-12-31 Vits Systems Gmbh Device for printing and impregnating/coating a web, comprises a delivery mechanism, a printing device, an impregnating tool, a drying device, a cooling device and a means for further processing of impregnating web
DE102009034605B3 (en) 2009-07-24 2011-01-27 Vits Technology Gmbh Apparatus for coating a continuous web
CN103894317A (en) * 2014-03-28 2014-07-02 苏州市建诚装饰材料有限公司 Spraying device
CN106835844B (en) * 2017-03-22 2018-08-21 山东东宇鸿翔装饰材料有限公司 Impregnation testing machine used for decorative paper

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US3179536A (en) * 1961-05-19 1965-04-20 Kimberly Clark Co Method and apparatus for coating paper
US3354867A (en) * 1965-07-12 1967-11-28 Midland Ross Corp Means to vary effective width of projected coating material
AT325005B (en) * 1967-11-20 1975-09-25 Benno Saladin PROCESS AND DEVICE FOR COATING IN ENDLESS TRAILS OR IN FORMAT CUT DOCUMENTS WITH POWDERED MATERIALS
SE427805B (en) * 1978-12-20 1983-05-09 Inventing Ab SET AND ESTABLISHMENT FOR OPTIONAL TREATMENT, SUCH AS SINGLE OR DOUBLE COATING, IMPREGNATION OR SURFACE OF A CURRENT COAT.
DE3010038A1 (en) * 1980-03-15 1981-09-24 Küsters, Eduard, 4150 Krefeld DEVICE FOR CONTINUOUSLY TREATING TEXTILES AND THE LIKE RAILWAYS WITH FOAM
DE3623402A1 (en) * 1985-07-31 1987-05-21 Jagenberg Ag METHOD AND DEVICE FOR CONTINUOUSLY APPLYING A Uniform Coating To A Material Web Running Across A Counter-Roller, Especially Paper Or Cardboard Web
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JP3514996B2 (en) * 1998-12-18 2004-04-05 ソニーケミカル株式会社 Coating equipment
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JP3460623B2 (en) * 1999-05-20 2003-10-27 ソニーケミカル株式会社 Coating device
DE19946325A1 (en) * 1999-09-28 2001-04-05 Vits Maschinenbau Gmbh Device for applying an abrasive coating compound to a continuous paper web

Also Published As

Publication number Publication date
WO2006069646A1 (en) 2006-07-06
DE102004063043B3 (en) 2006-07-20
US20080105197A1 (en) 2008-05-08
CN101065539A (en) 2007-10-31
EP1831465A1 (en) 2007-09-12

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