EP2844797B1 - Method for coating a paper web - Google Patents

Method for coating a paper web Download PDF

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Publication number
EP2844797B1
EP2844797B1 EP13715691.5A EP13715691A EP2844797B1 EP 2844797 B1 EP2844797 B1 EP 2844797B1 EP 13715691 A EP13715691 A EP 13715691A EP 2844797 B1 EP2844797 B1 EP 2844797B1
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EP
European Patent Office
Prior art keywords
paper web
layer
web
paper
coating
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EP13715691.5A
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German (de)
French (fr)
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EP2844797A1 (en
Inventor
Peter Hauer
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Vits Technology GmbH
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Vits Technology GmbH
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Priority to PL13715691T priority Critical patent/PL2844797T3/en
Publication of EP2844797A1 publication Critical patent/EP2844797A1/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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/70—Multistep processes; Apparatus for adding one or several substances in portions or in various ways to the paper, not covered by another single group of this main group
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • D21H17/48—Condensation polymers of aldehydes or ketones with phenols
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • D21H17/49—Condensation polymers of aldehydes or ketones with compounds containing hydrogen bound to nitrogen
    • D21H17/51—Triazines, e.g. melamine
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • D21H19/12—Coatings without pigments applied as a solution using water as the only solvent, e.g. in the presence of acid or alkaline compounds
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
    • 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
    • D21H27/24—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the surface to be covered being phenolic-resin paper laminates, vulcan fibre or similar cellulosic fibreboards
    • 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

Definitions

  • the invention relates to a method for coating a paper web.
  • Such methods are known per se. They are used to make cover layers for laminates of sheets and at least one layer of impregnated paper. This top layer should on the one hand have a predetermined decor and on the other hand have favorable physical and / or chemical properties such as abrasion and / or scratch resistance and resistance to water and chemicals. For this reason, predominantly expensive melamine resins have hitherto been used in practice for impregnation.
  • Such coated and / or impregnated paper webs are known per se and are used e.g. used as furniture foils or for floor laminate. Here, high demands are placed on the quality.
  • the decorative papers are impregnated with the melamine resin and dried with warm air.
  • the substrate e.g. a chipboard
  • the melamine resin causes the surface to be scratch-resistant and ensures that the decorative paper is securely bonded to the substrate.
  • the much cheaper urea resin can be used for a first impregnation.
  • the impregnated web must be coated on both sides with melamine resin in order to achieve the required surface properties of the laminate and to ensure the bonding with the flap. This is labor intensive and consumes more of the more expensive melamine resin than required for surface finish.
  • the WO 2008/134823 A1 describes a process for the production of impregnated paper in which a urea resin is used for impregnation.
  • the drying takes place by means of near-infrared rays, crosslinking of the resin being largely avoided.
  • the low cross-linking allows for the compression of the impregnated with the urea resin film with the substrate, that a secure bonding takes place.
  • a disadvantage of the method is that the required reliability is not given.
  • Next will be expensive electric Energy needed. In the case of colorful decors, spots of different colors are dried differently due to the different absorption and reflection, so that the web as a whole has an uneven moisture content.
  • urea resin does not have the required mechanical stability and therefore wears too quickly. Therefore, it is necessary to coat one surface of the laminate with a higher quality layer of e.g. To provide melamine resin. In the case of floor laminates, this can be achieved by so-called overlay papers which obtain special properties through special coatings and / or impregnations. For furniture, such overlays are too costly because of the lower quality requirements of the surface.
  • a subsequent coating of urea resin-impregnated paper webs with melamine resin is not possible because the high temperatures for the pre-crosslinking of the melamine resin have a negative effect on the urea resin, which is too crosslinked and therefore no longer tacky.
  • the coating of a paper web is performed in the following order: a first layer of a predetermined amount of melamine resin is applied to a first side of the paper web, the paper web is then temporally and spatially immediately following the application of the first layer (in line) at a web temperature of at least 110 ° C, then a second layer of a predetermined amount of urea resin is applied to a second side of the paper web and finally the paper web is dried at a web temperature of 90 ° to 110 ° C.
  • a paper web coated with urea resin and melamine resin can be produced, the proportion of urea resin being relatively high and that of melamine resin being correspondingly low.
  • the coated with urea resin second side of the paper web is intended for bonding to a substrate, such as a plate of wood material.
  • the paper web coated in this way can be glued to the substrate properly and firmly in a later step by application of heat and pressure (compression); because of the low web temperature during the second drying, the urea resin crosslinks only slightly.
  • the paper web decreases the pressing a surface that meets all quality criteria such as hardness, scratch resistance and abrasion resistance, because here the better properties of the melamine resin come into play.
  • the finished pressed substrate with the paper web produced by the process according to the invention is also optically flawless, in particular free of air inclusions. Therefore, according to the inventive process, a majority of the resin may be urea resin; There is thus achieved a significant cost savings.
  • the paper web is formed from a decorative paper.
  • a desired appearance of the finished substrate can be achieved.
  • the method has proven to be particularly suitable for decor papers.
  • the first layer of melamine resin is coated with hard, abrasion-resistant particles of e.g. Mixed with corundum. This increases the wear resistance of the first layer.
  • a web speed during coating and drying is at least 15 m / min. This ensures that the melamine resin barely penetrates into the paper web between the first coating and the first drying and is as far as possible available as a wear layer.
  • the application of the first layer takes place in the gusset.
  • an application unit has a limiting element which forms a gusset with a deflection roller.
  • the gusset is the melamine resin, if necessary contains the hard particles, given and so applied to the first side of the paper web. This has proved to be particularly favorable for the claimed method.
  • a device for carrying out the method comprises an unwinding device 2 for a paper web 1, a first application unit 3, a first dryer 4, a second application unit 5 and a second dryer 6.
  • the second dryer 6 is - not shown - a winding device or a cross cutter downstream with a stacking device.
  • the paper web 1 consists of printed or unprinted paper with a weight of 20 to 250 g / m 2 .
  • its first side corresponds to the printed side.
  • the first application unit 3 for applying a first coating composition to the first side of the paper web 1 comprises a deflecting roller 7 for deflecting the paper web 1 and a metering roller 8.
  • the deflecting roller 7 and the metering roller 8 are mounted with parallel axes of rotation in height and offset to the side.
  • the deflection roller 7 is associated with a limiting element 9, which is e.g. is formed of a substantially flat sheet and extends over the length and parallel to the guide roller 7.
  • the limiting element 9 is arranged below the metering roller 8 so that it forms a gusset 10 with the deflecting roller 7. It is arranged at an acute angle to the vertical in the wrapping region of the paper web 1 next to the deflection roller 7 and is guided in a lower end region so close to the shell that it touches the paper web 1 tangentially - at least approximately - and the gusset 10 seals down. At its sides, the gusset 10 is open.
  • the gusset 10 is associated with a manifold 11 for the introduction of the first coating composition, which is connected to a supply line. Below the deflection roller 7, a collecting tray 12 is arranged for overflowing first coating composition. The drip pan 12 is connected to a circulating system for the first coating composition.
  • the metering roller 8 forms with the guide roller 7 a narrow, adjustable metering.
  • the first dryer 4 is arranged, which is designed as a circulating air levitation dryer.
  • One Distance between the first application unit 3 and the first dryer 4 is kept as low as possible and is less than 2 m. In this way, in conjunction with a high web speed, a first drying takes place temporally and spatially immediately after application of a first layer 20, in order largely to avoid impregnation of the paper web 1.
  • the second application unit 5 for applying a second coating composition to a second side of the paper web 1 is arranged behind the first dryer 4 and comprises an anilox roller 13 and two pressure rollers 14 which ensure a certain wrap angle of the paper web 1 on the anilox roller 13.
  • Urea resin as the second coating composition is applicable by conventional means to the anilox roller 13 and e.g. metered by a doctor.
  • the second dryer 6 is arranged behind the second application unit 5 and essentially corresponds to the first dryer 4.
  • a so-called breathing path is arranged, in which the paper web 1 is deflected several times to extend the path in order to achieve the greatest possible impregnation of the paper web 1.
  • the paper web 1 is withdrawn from a supply roll, which is mounted in the unwinding device 2, and guided to the first application unit 3.
  • the paper web 1 is guided around the deflection roller 7 and through the metering gap.
  • the speed of the paper web 1 is at least 15 m / min.
  • the first coating composition is pumped in excess from a reservoir through the manifold 11.
  • a portion of the first coating composition consisting essentially of melamine resin in aqueous solution and possibly hard particles is entrained from the first side of the paper web 1 as the first layer 20 and dosed in the metering nip to a predetermined basis weight.
  • Excess first coating material flows over the open sides of the gusset 10 into the sump 12. From here, the excess first coating composition is conveyed back into the reservoir.
  • the paper web 1 with the wet first layer 20 then enters the first dryer 4 and is here at relatively high temperatures at which the web temperature reaches about 110 ° to 140 ° C, dried to a predetermined residual moisture.
  • the first coating composition Since only little time elapses between the application of the first layer 20 and the first drying, the first coating composition only completely permeates the paper web 1. This is intended in order to obtain the first layer 20 as extensively as a wear layer.
  • the second coating composition of urea resin in aqueous solution in the second application unit 5 is applied to a second side of the paper web 1 in a predetermined amount as a second layer 21.
  • the paper web 1 with the layers 20, 21 then passes through a residence section in which the second coating material penetrates the paper web 1 in such a way that it is partially penetrated by the first and, moreover, by the second coating composition.
  • the coated paper web 1 is dried in the second dryer 6 to a predetermined final moisture so that a web temperature is 90 ° to a maximum of 110 ° C.
  • the finished coated paper web 1 is either cut into sheets which are stacked or wound into a roll.
  • a layer structure of the finished coated and dried paper web 1 is in the FIG. 2 shown.
  • the first layer 20 is formed. This penetrates the paper web 1 only partially, as indicated by the dotted line 22.
  • the second layer 21 is applied to the second side of the paper web 1, which is opposite to the first, and adjoins the first layer 20 within the paper.
  • the invention is described with reference to an embodiment in which the first layer 20 in the gusset 10 and the second layer 21 is applied with an anilox roller 13.
  • an anilox roller 13 instead of these types of applications, other known devices for coating can be used.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Beschichten einer Papierbahn.The invention relates to a method for coating a paper web.

Solche Verfahren sind an sich bekannt. Sie werden eingesetzt, um Decklagen für Laminate aus Platten und mindestens einer Schicht imprägnierten Papiers herzustellen. Diese Decklage soll einerseits ein vorbestimmtes Dekor aufweisen und andererseits günstige physikalische und/oder chemische Eigenschaften wie Abrieb- und/oder Kratzfestigkeit sowie Beständigkeit gegen Wasser und Chemikalien besitzen. Daher werden bisher in der Praxis überwiegend teure Melaminharze zum Imprägnieren verwendet.Such methods are known per se. They are used to make cover layers for laminates of sheets and at least one layer of impregnated paper. This top layer should on the one hand have a predetermined decor and on the other hand have favorable physical and / or chemical properties such as abrasion and / or scratch resistance and resistance to water and chemicals. For this reason, predominantly expensive melamine resins have hitherto been used in practice for impregnation.

Solche beschichteten und/oder imprägnierten Papierbahnen sind an sich bekannt und werden z.B. als Möbelfolien oder für Fußbodenlaminat verwendet. Hierbei werden hohe Anforderungen an die Qualität gestellt.Such coated and / or impregnated paper webs are known per se and are used e.g. used as furniture foils or for floor laminate. Here, high demands are placed on the quality.

Bei den bekannten Verfahren werden die Dekorpapiere mit dem Melaminharz getränkt und mit Warmluft getrocknet. Beim Verpressen unter Hitze und Druck mit dem Substrat, z.B. einer Spanplatte, bewirkt das Melaminharz, dass die Oberfläche kratzfest ist und dass ein sicheres Verkleben des Dekorpapiers mit dem Substrat gegeben ist. Um Kosten zu sparen, kann für ein erstes Imprägnieren das wesentlich preiswertere Harnstoffharz verwendet werden. Dann muss die imprägnierte Bahn beidseitig mit Melaminharz beschichtet werden, um die verlangten Oberflächeneigenschaften des Laminats zu erzielen und um die Verklebung mit der Patte zu gewährleisten. Dies ist arbeitsaufwendig, und es wird mehr von dem teureren Melaminharz verbraucht als für die Oberflächengüte erforderlich.In the known methods, the decorative papers are impregnated with the melamine resin and dried with warm air. When pressed under heat and pressure with the substrate, e.g. a chipboard, the melamine resin causes the surface to be scratch-resistant and ensures that the decorative paper is securely bonded to the substrate. To save costs, the much cheaper urea resin can be used for a first impregnation. Then the impregnated web must be coated on both sides with melamine resin in order to achieve the required surface properties of the laminate and to ensure the bonding with the flap. This is labor intensive and consumes more of the more expensive melamine resin than required for surface finish.

Wenn nur eine Seite der mit reinem Harnstoffharz imprägnierten Bahn mit Melaminharz beschichtet ist, ist deren Verkleben mit dem Substrat nicht möglich, weil das Harnstoffharz infolge der beim Trocknen des Melaminharzes erforderlichen höheren Temperaturen bereits zu stark vernetzt ist und daher keine ausreichende Klebkraft aufweist.If only one side of the sheet impregnated with pure urea resin is coated with melamine resin, its sticking to the substrate is not possible because the urea resin is already over-crosslinked due to the higher temperatures required for drying the melamine resin and therefore does not have sufficient bond strength.

Es ist wünschenswert, beim Imprägnieren von Papierbahnen das Melaminharz weitgehend durch wesentlich preiswerteres Harnstoffharz zu ersetzen.It is desirable to replace the melamine resin in the impregnation of paper webs largely by much cheaper urea resin.

Die WO 2008/134823 A1 beschreibt ein Verfahren zur Herstellung von imprägniertem Papier, bei dem zum Imprägnieren ein Harnstoffharz verwendet wird. Die Trocknung erfolgt mittels nahen Infrarot- Strahlen, wobei ein Vernetzen des Harzes weitgehend vermieden wird. Die geringe Vernetzung erlaubt beim Verpressen der mit dem Harnstoffharz imprägnierten Folie mit dem Substrat, dass ein sicheres Verkleben erfolgt. Ein Nachteil des Verfahrens ist, dass die geforderte Betriebssicherheit nicht gegeben ist. Weiter wird teure elektrische Energie benötigt. Bei bunten Dekoren werden Stellen mit verschiedenen Farben wegen der unterschiedlichen Absorption und Reflexion unterschiedlich getrocknet, so dass die Bahn insgesamt eine ungleichmäßige Feuchte aufweist.The WO 2008/134823 A1 describes a process for the production of impregnated paper in which a urea resin is used for impregnation. The drying takes place by means of near-infrared rays, crosslinking of the resin being largely avoided. The low cross-linking allows for the compression of the impregnated with the urea resin film with the substrate, that a secure bonding takes place. A disadvantage of the method is that the required reliability is not given. Next will be expensive electric Energy needed. In the case of colorful decors, spots of different colors are dried differently due to the different absorption and reflection, so that the web as a whole has an uneven moisture content.

Ein weiteres Problem besteht darin, dass das Harnstoffharz nicht die erforderliche mechanische Stabilität aufweist und daher zu schnell verschleißt. Daher ist es erforderlich, eine Oberfläche des Laminats mit einer qualitativ höherwertigen Schicht aus z.B. Melaminharz zu versehen. Bei Fußbodenlaminaten ist dies durch sogenannte Overlay-Papiere zu erzielen, die besondere Eigenschaften durch spezielle Beschichtungen und/oder Imprägnierungen erhalten. Für Möbel sind solche Overlays zu aufwendig, weil etwas geringere Anforderungen an die Qualität der Oberfläche gestellt werden. Eine nachträgliche Beschichtung von mit Harnstoffharz imprägnierten Papierbahnen mit Melaminharz ist nicht möglich, weil sich die für die Vorvernetzung des Melaminharzes hohen Temperaturen negativ auf das Harnstoffharz auswirken, das dabei zu stark vernetzt und daher nicht mehr klebfähig ist.Another problem is that the urea resin does not have the required mechanical stability and therefore wears too quickly. Therefore, it is necessary to coat one surface of the laminate with a higher quality layer of e.g. To provide melamine resin. In the case of floor laminates, this can be achieved by so-called overlay papers which obtain special properties through special coatings and / or impregnations. For furniture, such overlays are too costly because of the lower quality requirements of the surface. A subsequent coating of urea resin-impregnated paper webs with melamine resin is not possible because the high temperatures for the pre-crosslinking of the melamine resin have a negative effect on the urea resin, which is too crosslinked and therefore no longer tacky.

Es ist die Aufgabe der Erfindung, ein Verfahren zu schaffen, das die Herstellung preiswerter Möbelfolien ermöglicht, die alle qualitativen Anforderungen erfüllt.It is the object of the invention to provide a method that allows the production of inexpensive furniture films that meets all qualitative requirements.

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

Das Beschichten einer Papierbahn wird in folgender Reihenfolge durchgeführt: eine erste Schicht aus einer vorbestimmten Menge an Melaminharz wird auf eine erste Seite der Papierbahn aufgetragen, die Papierbahn wird dann zeitlich und räumlich unmittelbar anschließend an das Auftragen der ersten Schicht (in line) bei einer Bahntemperatur von mindestens 110°C getrocknet, dann wird eine zweite Schicht aus einer vorbestimmten Menge an Harnstoffharz auf eine zweite Seite der Papierbahn aufgetragen und schließlich die Papierbahn bei einer Bahntemperatur von 90° bis 110°C getrocknet.The coating of a paper web is performed in the following order: a first layer of a predetermined amount of melamine resin is applied to a first side of the paper web, the paper web is then temporally and spatially immediately following the application of the first layer (in line) at a web temperature of at least 110 ° C, then a second layer of a predetermined amount of urea resin is applied to a second side of the paper web and finally the paper web is dried at a web temperature of 90 ° to 110 ° C.

Weitere Schritte wie z.B. ein Schneiden der Papierbahn zu Bogen können sich an das zweite Trocknen anschließen.Further steps, such as cutting the paper web into sheets may follow the second drying.

Durch das Verfahren wird erreicht, dass eine mit Harnstoffharz und Melaminharz beschichtete Papierbahn hergestellt werden kann, wobei der Anteil an Harnstoffharz relativ hoch und der an Melaminharz entsprechend gering ist. Die mit Harnstoffharz beschichtete zweite Seite der Papierbahn ist für eine Verklebung auf einem Substrat, z.B. einer Platte aus Holzwerkstoff, vorgesehen. Die so beschichtete Papierbahn lässt sich in einem späteren Schritt einwandfrei und fest durch Anwendung von Hitze und Druck (Verpressen) mit dem Substrat verkleben; denn wegen der geringen Bahntemperatur während des zweiten Trocknens vernetzt das Harnstoffharz nur geringfügig. Weiterhin weist die Papierbahn nach dem Verpressen eine Oberfläche auf, die alle Qualitäts- Kriterien wie Härte, Kratzfestigkeit und Abriebfestigkeit erfüllt, weil hier die besseren Eigenschaften des Melaminharzes zum Tragen kommen.It is achieved by the method that a paper web coated with urea resin and melamine resin can be produced, the proportion of urea resin being relatively high and that of melamine resin being correspondingly low. The coated with urea resin second side of the paper web is intended for bonding to a substrate, such as a plate of wood material. The paper web coated in this way can be glued to the substrate properly and firmly in a later step by application of heat and pressure (compression); because of the low web temperature during the second drying, the urea resin crosslinks only slightly. Furthermore, the paper web decreases the pressing a surface that meets all quality criteria such as hardness, scratch resistance and abrasion resistance, because here the better properties of the melamine resin come into play.

Die Fachwelt ist bisher davon ausgegangen, dass eine Papierbahn für eine denn Ansprüchen genügende Imprägnierung und/oder Beschichtung von einer Seite vollständig mit Harz durchtränkt werden muss, um Lüfteinschlüsse in der Papierbahn gänzlich zu verdrängen. Erst dann sind weitere Materialaufträge möglich. Man glaubte also, dass die Papierbahn, die einseitig dünn mit Harz beschichtet und unmittelbar anschleißend getrocknet wird, ohne dass das Harz weitgehend oder sogar vollständig das Papier imprägnieren kann, nicht ohne Lufteinschlüsse hergestellt werden kann. Denn man hat angenommen, dass die zweite Schicht in der Papierbahn nach dem ersten Beschichten noch vorhandene Luft nicht vollständig verdrängen kann.The experts have hitherto assumed that a paper web for impregnation and / or coating that satisfies requirements must be completely saturated with resin from one side in order to completely displace air inclusions in the paper web. Only then are further material orders possible. It was thus believed that the paper web which is thinly resin coated on one side and dried immediately after application, without allowing the resin to substantially or even completely impregnate the paper, can not be made without air pockets. Because it has been assumed that the second layer in the paper web after the first coating can not completely displace existing air.

Lufteinschlüsse stören den optischen Eindruck des fertig verpressten Substrats stark und führen somit oftmals zu dessen Unbrauchbarkeit.Air inclusions strongly disturb the visual impression of the finished pressed substrate and thus often lead to its uselessness.

Überraschend hat sich aber gezeigt, dass das fertig verpresste Substrat mit der nach dem erfindungsgemäßen Verfahren hergestellten Papierbahn auch optisch einwandfrei, insbesondere frei von Lufteinschlüssen ist. Daher kann nach dem erfinderischen Verfahren ein überwiegender Teil des Harzes aus Harnstoffharz bestehen; es wird somit eine erhebliche Kosteneinsparung erzielt.Surprisingly, however, it has been shown that the finished pressed substrate with the paper web produced by the process according to the invention is also optically flawless, in particular free of air inclusions. Therefore, according to the inventive process, a majority of the resin may be urea resin; There is thus achieved a significant cost savings.

Die Unteransprüche betreffen die vorteilhafte Ausgestaltung der Erfindung.The subclaims relate to the advantageous embodiment of the invention.

In einer Ausgestaltung der Erfindung ist die Papierbahn aus einem Dekorpapier gebildet. Hierdurch lässt sich ein gewünschtes Aussehen des fertigen Substrats erzielen. Das Verfahren hat sich für Dekorpapiere als besonders gut geeignet erwiesen.In one embodiment of the invention, the paper web is formed from a decorative paper. As a result, a desired appearance of the finished substrate can be achieved. The method has proven to be particularly suitable for decor papers.

In einer weiteren Ausgestaltung werden der ersten Schicht aus Melaminharz harte, abriebfeste Partikel aus z.B. Korund beigemischt. Hierdurch wird die Verschleißfestigkeit der ersten Schicht erhöht.In another embodiment, the first layer of melamine resin is coated with hard, abrasion-resistant particles of e.g. Mixed with corundum. This increases the wear resistance of the first layer.

In einer weiteren Ausgestaltung beträgt eine Bahngeschwindigkeit während des Beschichtens und des Trocknens mindestens 15 m/min. Dies gewährleistet, dass das Melaminharz zwischen dem ersten Beschichten und dem ersten Trocknen kaum in die Papierbahn eindringt und so weitestgehend als Nutzschicht verfügbar ist.In a further embodiment, a web speed during coating and drying is at least 15 m / min. This ensures that the melamine resin barely penetrates into the paper web between the first coating and the first drying and is as far as possible available as a wear layer.

In einer weiteren Ausgestaltung erfolgt das Auftragen der ersten Schicht im Zwickel. Das bedeutet, dass eine Auftragseinheit ein Begrenzungselement aufweist, das mit einer Umlenkwalze einen Zwickel bildet. In den Zwickel wird das Melamiharz, das gegebenenfalls die harten Partikel enthält, gegeben und so an die erste Seite der Papierbahn angetragen. Dies hat sich für das beanspruchte Verfahren als besonders günstig erwiesen.In a further embodiment, the application of the first layer takes place in the gusset. This means that an application unit has a limiting element which forms a gusset with a deflection roller. In the gusset is the melamine resin, if necessary contains the hard particles, given and so applied to the first side of the paper web. This has proved to be particularly favorable for the claimed method.

Die Erfindung wird anhand der beigefügten schematischen Zeichnung weiter erläutert. Dabei zeigen

  • Figur 1 eine Seitenansicht einer Vorrichtung zur Durchführung des Verfahrens und
  • Figur 2 einen Schnitt durch eine beschichtete Papierbahn.
The invention will be further explained with reference to the accompanying schematic drawing. Show
  • FIG. 1 a side view of an apparatus for performing the method and
  • FIG. 2 a section through a coated paper web.

Wie aus der Figur 1 ersichtlich umfasst eine Vorrichtung zur Durchführung des Verfahrens eine Abwickelvorrichtung 2 für eine Papierbahn 1, eine erste Auftragseinheit 3, einen ersten Trockner 4, eine zweite Auftragseinheit 5 und einen zweiten Trockner 6. Dem zweiten Trockner 6 ist - nicht dargestellt - eine Aufwickelvorrichtung oder ein Querschneider mit einer Stapelvorrichtung nachgeschaltet.Like from the FIG. 1 a device for carrying out the method comprises an unwinding device 2 for a paper web 1, a first application unit 3, a first dryer 4, a second application unit 5 and a second dryer 6. The second dryer 6 is - not shown - a winding device or a cross cutter downstream with a stacking device.

Die Papierbahn 1 besteht aus bedrucktem oder unbedrucktem Papier mit einem Gewicht von 20 bis 250 g/m2. Im Fall einer bedruckten Papierbahn 1 entspricht deren erste Seite der bedruckten Seite.The paper web 1 consists of printed or unprinted paper with a weight of 20 to 250 g / m 2 . In the case of a printed paper web 1, its first side corresponds to the printed side.

Die erste Auftrageinheit 3 zum Auftragen einer ersten Beschichtungsmasse auf die erste Seite der Papierbahn 1 umfasst eine Umlenkwalze 7 zur Umlenkung der Papierbahn 1 und eine Dosierwalze 8. Die Umlenkwalze 7 und die Dosierwalze 8 sind mit parallelen Drehachsen in der Höhe und zur Seite versetzt gelagert.The first application unit 3 for applying a first coating composition to the first side of the paper web 1 comprises a deflecting roller 7 for deflecting the paper web 1 and a metering roller 8. The deflecting roller 7 and the metering roller 8 are mounted with parallel axes of rotation in height and offset to the side.

Der Umlenkwalze 7 ist ein Begrenzungselement 9 zugeordnet, das z.B. aus einem weitgehend ebenen Blech gebildet ist und sich über die Länge sowie parallel zu der Umlenkwalze 7 erstreckt. Das Begrenzungselement 9 ist unterhalb der Dosierwalze 8 so angeordnet, dass es mit der Umlenkwalze 7 einen Zwickel 10 bildet. Es ist in einem spitzen Winkel zur Senkrechten im Umschlingungsbereich der Papierbahn 1 neben der Umlenkwalze 7 angeordnet und ist in einem unteren Endbereich so nah an deren Mantel geführt, dass es die Papierbahn 1 tangential - zumindest annähernd - berührt und den Zwickel 10 nach unten abdichtet. An seinen Seiten ist der Zwickel 10 offen. Dem Zwickel 10 ist ein Verteilerrohr 11 für die Einleitung der ersten Beschichtungsmasse zugeordnet, das an eine Zuführleitung angeschlossen ist. Unterhalb der Umlenkwalze 7 ist eine Auffangwanne 12 für überlaufende erste Beschichtungsmasse angeordnet. Die Auffangwanne 12 ist an ein Umwälzsystem für die erste Beschichtungsmasse angeschlossen.The deflection roller 7 is associated with a limiting element 9, which is e.g. is formed of a substantially flat sheet and extends over the length and parallel to the guide roller 7. The limiting element 9 is arranged below the metering roller 8 so that it forms a gusset 10 with the deflecting roller 7. It is arranged at an acute angle to the vertical in the wrapping region of the paper web 1 next to the deflection roller 7 and is guided in a lower end region so close to the shell that it touches the paper web 1 tangentially - at least approximately - and the gusset 10 seals down. At its sides, the gusset 10 is open. The gusset 10 is associated with a manifold 11 for the introduction of the first coating composition, which is connected to a supply line. Below the deflection roller 7, a collecting tray 12 is arranged for overflowing first coating composition. The drip pan 12 is connected to a circulating system for the first coating composition.

Die Dosierwalze 8 bildet mit der Umlenkwalze 7 einen engen, einstellbaren Dosierspalt.The metering roller 8 forms with the guide roller 7 a narrow, adjustable metering.

In Transportrichtung (Pfeil P) der Papierbahn 1 hinter der ersten Auftragseinheit 3 ist der erste Trockner 4 angeordnet, der als Umluft- Schwebe- Trockner ausgebildet ist. Ein Abstand zwischen der ersten Auftragseinheit 3 und dem ersten Trockner 4 ist so gering wie möglich gehalten und beträgt weniger als 2 m. Hierdurch erfolgt in Verbindung mit einer hohen Bahngeschwindigkeit ein erstes Trocknen zeitlich und räumlich unmittelbar nach einem Auftragen einer ersten Schicht 20, um eine Durchtränkung der Papierbahn 1 weitgehend zu vermeiden.In the transport direction (arrow P) of the paper web 1 behind the first application unit 3, the first dryer 4 is arranged, which is designed as a circulating air levitation dryer. One Distance between the first application unit 3 and the first dryer 4 is kept as low as possible and is less than 2 m. In this way, in conjunction with a high web speed, a first drying takes place temporally and spatially immediately after application of a first layer 20, in order largely to avoid impregnation of the paper web 1.

Die zweite Auftragseinheit 5 zum Auftragen einer zweiten Beschichtungsmasse auf eine zweite Seite der Papierbahn 1 ist hinter dem ersten Trockner 4 angeordnet und umfasst eine Rasterwalze 13 sowie zwei Andrückwalzen 14, die einen bestimmten Umschlingungswinkel der Papierbahn 1 auf der Rasterwalze 13 gewährleisten. Harnstoffharz als die zweite Beschichtungsmasse ist mit üblichen Mitteln an die Rasterwalze 13 antragbar und z.B. mittels einer Rakel dosierbar.The second application unit 5 for applying a second coating composition to a second side of the paper web 1 is arranged behind the first dryer 4 and comprises an anilox roller 13 and two pressure rollers 14 which ensure a certain wrap angle of the paper web 1 on the anilox roller 13. Urea resin as the second coating composition is applicable by conventional means to the anilox roller 13 and e.g. metered by a doctor.

Der zweite Trockner 6 ist hinter der zweiten Auftragseinheit 5 angeordnet und entspricht im Wesentlichen dem ersten Trockner 4.The second dryer 6 is arranged behind the second application unit 5 and essentially corresponds to the first dryer 4.

Zwischen der zweiten Auftragseinheit 5 und dem zweiten Trockner 6 ist eine sogenannte Atemstrecke angeordnet, in der die Papierbahn 1 zur Verlängerung der Wegstrecke mehrfach umgelenkt ist, um eine möglichst weitgehende Durchtränkung der Papierbahn 1 zu erzielen.Between the second application unit 5 and the second dryer 6, a so-called breathing path is arranged, in which the paper web 1 is deflected several times to extend the path in order to achieve the greatest possible impregnation of the paper web 1.

Im Betrieb wird die Papierbahn 1 von einer Vorratsrolle, die in der Abwickelvorrichtung 2 gelagert ist, abgezogen und zu der ersten Auftragseinheit 3 geführt. Hier wird die Papierbahn 1 um die Umlenkwalze 7 und durch den Dosierspalt geführt.In operation, the paper web 1 is withdrawn from a supply roll, which is mounted in the unwinding device 2, and guided to the first application unit 3. Here, the paper web 1 is guided around the deflection roller 7 and through the metering gap.

Die Geschwindigkeit der Papierbahn 1 beträgt mindestens 15 m/min.The speed of the paper web 1 is at least 15 m / min.

In den Zwickel 10 wird durch das Verteilrohr 11 die erste Beschichtungsmasse im Überschuss aus einem Vorratsbehälter gepumpt. Ein Teil der ersten Beschichtungsmasse, die im Wesentlichen aus Melaminharz in wässriger Lösung und gegebenenfalls harten Partikeln besteht, wird von der ersten Seite der Papierbahn 1 als die erste Schicht 20 mitgeschleppt und in dem Dosierspalt auf ein vorbestimmtes Flächengewicht dosiert. Überschüssige erste Beschichtungsmasse fließt über die offenen Seiten des Zwickels 10 in die Auffangwanne 12. Von hier wird die überschüssige erste Beschichtungsmasse zurück in den Vorratsbehälter gefördert.In the gusset 10, the first coating composition is pumped in excess from a reservoir through the manifold 11. A portion of the first coating composition consisting essentially of melamine resin in aqueous solution and possibly hard particles is entrained from the first side of the paper web 1 as the first layer 20 and dosed in the metering nip to a predetermined basis weight. Excess first coating material flows over the open sides of the gusset 10 into the sump 12. From here, the excess first coating composition is conveyed back into the reservoir.

Die Papierbahn 1 mit der nassen ersten Schicht 20 tritt dann in den ersten Trockner 4 ein und wird hier bei relativ hohen Temperaturen, bei denen die Bahntemperatur ca. 110° bis 140°C erreicht, bis auf eine vorbestimmte Restfeuchte getrocknet.The paper web 1 with the wet first layer 20 then enters the first dryer 4 and is here at relatively high temperatures at which the web temperature reaches about 110 ° to 140 ° C, dried to a predetermined residual moisture.

Da zwischen dem Auftrag der ersten Schicht 20 und dem ersten Trocknen nur wenig Zeit vergeht, durchtränkt die erste Beschichtungsmasse die Papierbahn 1 nur unvollständig. Dies ist gewollt, um die erste Schicht 20 möglichst weitgehend als Verschleißschicht zu gewinnen.Since only little time elapses between the application of the first layer 20 and the first drying, the first coating composition only completely permeates the paper web 1. This is intended in order to obtain the first layer 20 as extensively as a wear layer.

Nach dem ersten Trocknen wird die zweite Beschichtungsmasse aus Harnstoffharz in wässriger Lösung in der zweiten Auftragseinheit 5 auf eine zweite Seite der Papierbahn 1 in vorbestimmter Menge als zweite Schicht 21 aufgetragen.After the first drying, the second coating composition of urea resin in aqueous solution in the second application unit 5 is applied to a second side of the paper web 1 in a predetermined amount as a second layer 21.

Die Papierbahn 1 mit den Schichten 20, 21 durchläuft dann eine Verweilstrecke, in der die zweite Beschichtungsmasse so in die Papierbahn 1 eindringt, dass diese teilweise von der ersten und im Übrigen von der zweiten Beschichtungsmasse durchsetzt ist.The paper web 1 with the layers 20, 21 then passes through a residence section in which the second coating material penetrates the paper web 1 in such a way that it is partially penetrated by the first and, moreover, by the second coating composition.

Nach der Verweilstrecke wird die beschichtete Papierbahn 1 in dem zweiten Trockner 6 auf eine vorbestimmte Endfeuchte so getrocknet, dass eine Bahntemperatur 90° bis maximal 110°C beträgt.After the dwell, the coated paper web 1 is dried in the second dryer 6 to a predetermined final moisture so that a web temperature is 90 ° to a maximum of 110 ° C.

Nach dem zweiten Trocknen wird die fertig beschichtete Papierbahn 1 entweder zu Bogen geschnitten, die gestapelt werden, oder zu einer Rolle aufgewickelt.After the second drying, the finished coated paper web 1 is either cut into sheets which are stacked or wound into a roll.

Ein Schichtaufbau der fertig beschichteten und getrockneten Papierbahn 1 ist in der Figur 2 dargestellt. Auf der ersten, hier oberen bedruckten Seite der Papierbahn 1 ist die erste Schicht 20 gebildet. Diese durchdringt die Papierbahn 1 nur teilweise, wie mit der gepunkteten Linie 22 angedeutet ist. Die zweite Schicht 21 ist auf der zweiten Seite der Papierbahn 1 aufgetragen, die der ersten gegenüber liegt, und grenzt innerhalb des Papiers an die erste Schicht 20 an.A layer structure of the finished coated and dried paper web 1 is in the FIG. 2 shown. On the first, here upper printed side of the paper web 1, the first layer 20 is formed. This penetrates the paper web 1 only partially, as indicated by the dotted line 22. The second layer 21 is applied to the second side of the paper web 1, which is opposite to the first, and adjoins the first layer 20 within the paper.

Die Erfindung ist anhand eines Ausführungsbeispiels beschrieben, bei dem die erste Schicht 20 im Zwickel 10 und die zweite Schicht 21 mit einer Rasterwalze 13 aufgetragen wird. Anstelle dieser Auftragsarten sind auch andere bekannte Vorrichtungen zur Beschichtung einsetzbar.The invention is described with reference to an embodiment in which the first layer 20 in the gusset 10 and the second layer 21 is applied with an anilox roller 13. Instead of these types of applications, other known devices for coating can be used.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Papierbahnpaper web
22
Abwickelvorrichtungunwinding
33
erste Auftragseinheitfirst order unit
44
erster Trocknerfirst dryer
55
zweite Auftragseinheitsecond order unit
66
zweiter Trocknersecond dryer
77
Umlenkwalzedeflecting
88th
Dosierwalzemetering
99
Begrenzungselementlimiting element
1010
Zwickelgore
1111
Verteilerrohrmanifold
1212
Auffangwannedrip tray
1313
Rasterwalzeanilox roller
1414
Andrückwalzepressure roller
2020
erste Schichtfirst shift
2121
zweite Schichtsecond layer
2222
punktierte Liniedotted line
PP
Pfeilarrow

Claims (5)

  1. Method for coating a paper web (1), comprising the steps in the stated sequence:
    applying a first layer (20) of a pre-determined quantity of melamine resin to a first side of the paper web (1),
    first drying of the paper web (1) at a time immediately following the application of the first layer (20) at a web temperature of 110° to 140°C,
    applying a second layer (21) of a pre-determined quantity of urea-formaldehyde resin to a second side of the paper web (1),
    second drying of the paper web (1) at a web temperature of 90° to 110°C.
  2. Method according to claim 1, characterised in that the paper web (1) is made from decorative paper.
  3. Method according to one of the claims 1 or 2, characterised in that hard particles are admixed with the melamine resin.
  4. Method according to one of the claims 1 to 3, characterised in that a web speed is at least 15 m/min during coating and drying.
  5. Method according to one of the claims 1 to 4, characterised in that the application of the first layer (20) is realised in the nip (10).
EP13715691.5A 2012-05-02 2013-04-11 Method for coating a paper web Active EP2844797B1 (en)

Priority Applications (1)

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DE102012103824.4A DE102012103824B4 (en) 2012-05-02 2012-05-02 Process for coating a paper web
PCT/EP2013/057607 WO2013164177A1 (en) 2012-05-02 2013-04-11 Method for coating a paper web

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AT14447U1 (en) * 2014-10-20 2015-11-15 Valmet Technologies Inc Arrangement for retrofitting a fiber web machine with an application for a treatment medium
DE102021123733A1 (en) 2021-09-14 2023-03-16 Vits Technology Gmbh Process for coating a printed web of material

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DE2230095A1 (en) 1971-09-15 1974-01-03 Gerhard Dipl Ing Tuch CAR LIFT WITH FLOATING FOUNDATION
DE2917170A1 (en) * 1978-05-03 1979-11-15 Oesterr Hiag Werke Ag METHOD OF MANUFACTURING A MELAMINE-COATED PAPER
SE460274B (en) * 1988-02-18 1989-09-25 Perstorp Ab PROCEDURES FOR PREPARING A RESISTANT, DECORATIVE TEMPORARY LAMINATE
DE19710549C2 (en) 1997-03-14 1999-01-28 Vits Maschinenbau Gmbh Process and plant for impregnating and drying a continuous web
US6325884B1 (en) * 1999-01-14 2001-12-04 Panolam Industries Abrasion resistant laminate and process for producing same
DE19901525C2 (en) 1999-01-16 2001-02-08 Vits Maschinenbau Gmbh Plant for impregnating and coating paper
CA2295416C (en) * 1999-03-12 2005-10-04 Premark Rwp Holdings, Inc. System and method for two sided sheet treating
DE10355180B4 (en) * 2003-11-26 2010-04-08 Thomas C. Linnemann Method for producing a decorative laminate
CN100418714C (en) 2004-07-28 2008-09-17 株式会社新光Boardtech Fabricating method of decorative board and decorative board made by the same
US20110159208A1 (en) 2007-05-07 2011-06-30 Depco-Trh Pty Ltd Improvements in the manufacture of b-stage resin impregnated papers or non-wovens
US20090087643A1 (en) * 2007-10-02 2009-04-02 Gottzmann Andreas M Laminate Surface Layer Without an Overlay and Method of Manufacture
DE102008008292A1 (en) * 2008-02-07 2009-08-13 hülsta-werke Hüls GmbH & Co KG Paper layer for producing a flat, printed or printable component
CN201310053Y (en) 2008-11-11 2009-09-16 乐山吉象地板制品有限公司 Wear-resisting decorative paper
DE102009013471A1 (en) * 2009-03-19 2010-09-23 Dekor-Kunststoffe Gmbh decorative paper

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US9644321B2 (en) 2017-05-09
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DE102012103824B4 (en) 2015-12-03
CN104254648A (en) 2014-12-31
US20150086712A1 (en) 2015-03-26
PL2844797T3 (en) 2016-08-31

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