EP0991816B1 - Method for producing paper - Google Patents

Method for producing paper Download PDF

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Publication number
EP0991816B1
EP0991816B1 EP98936327A EP98936327A EP0991816B1 EP 0991816 B1 EP0991816 B1 EP 0991816B1 EP 98936327 A EP98936327 A EP 98936327A EP 98936327 A EP98936327 A EP 98936327A EP 0991816 B1 EP0991816 B1 EP 0991816B1
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EP
European Patent Office
Prior art keywords
paper
set forth
web
emulsion
binding agent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98936327A
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German (de)
French (fr)
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EP0991816A1 (en
Inventor
Heinz Haller
Bernhard Schwarz
Wim Janssen
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.)
Wkp Wuertt Kunststoffplatten-Werke & Co KG GmbH
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Wkp Wuertt Kunststoffplatten-Werke & Co KG GmbH
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Priority claimed from DE19734941A external-priority patent/DE19734941A1/en
Application filed by Wkp Wuertt Kunststoffplatten-Werke & Co KG GmbH filed Critical Wkp Wuertt Kunststoffplatten-Werke & Co KG GmbH
Publication of EP0991816A1 publication Critical patent/EP0991816A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0081—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/36—Printing on other surfaces than ordinary paper on pretreated paper, e.g. parchment, oiled paper, paper for registration purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0045—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or film forming compositions cured by mechanical wave energy, e.g. ultrasonics, cured by electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams, or cured by magnetic or electric fields, e.g. electric discharge, plasma
    • 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
    • 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
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/52—Epoxy resins
    • 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
    • D21H17/53—Polyethers; Polyesters
    • 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
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/57—Polyureas; Polyurethanes

Definitions

  • the invention relates to a method for producing paper, Paper fleece, laminate or the like.
  • Treat to less water and reduce drying capacity to be able is proposed in DE 44 13 619 C2 the size press of the paper machine a system made of a water-dilutable, Electron beam curable acrylic in the form a dispersion, emulsion or solution.
  • the Hardening takes place after the water content has evaporated the use of electron beam technology either directly in the paper machine or outside.
  • DE-A-27 27 312 describes a process for producing gap-resistant coating webs that have hardened synthetic resin on the basis of papers with a basis weight of ⁇ 60 g / m 2 , which are glued to the surfaces of wood-based panels.
  • the solution or dispersion of a curable impregnating resin is first applied in a predetermined amount to the side to be printed on the paper side intended for decor printing, then the impregnated paper is dried and decoratively printed, after which - if necessary after applying an intermediate layer - coated with the solution or dispersion of a curable resin as a topcoat, dried again and cured.
  • An aqueous acrylic resin solution or the aqueous solution of an aminoplast resin can be used as the curable resin.
  • the inventor has set himself the task at the beginning to further improve the described method, in particular increase the printability and the deformability, In addition, the economy should be designed more cheaply become.
  • the non-crosslinked acrylate material under Evaporation of water from the binder dried; the non-crosslinked material web is then printed after the Printing applied a varnish curable with electron beam and then triggered the crosslinking or polymerization. That non-cross-linked product containing acrylate after drying - if necessary after one-sided Calendering, i.e.
  • the - preferably provided by pressure impregnation - Impregnation process should with polyester, epoxy, urethane or Full acrylate at room temperature, especially 200 to 400 m / min conveyor speed performed as well as the material web on one - advantageously a chromed one Offering surface - heated roller contact dried from 20 to 25% water content to 2 to 4 % Water content.
  • the non-crosslinked material web will be good with preference Wettability and a smooth surface thanks to calendering printed, for example, by gravure printing; the polymers increase flexibility and ductility the material web and promote a clean Pressure Education.
  • the one in the usual way produced defects in gravure printing including a reduction in the conciseness or loyalty of the Playback - for example when printing with a wood pattern - no longer occur here.
  • the recycling of the emulsion is of particular importance; the polymers present in uncrosslinked paper residues or the emulsion, dispersion or solution can also be used for the binder feed device, especially for the size press, be recycled, such as that from the impregnation process excess polymer-containing emulsion.
  • a paper machine 10 for producing paper or paper fleece - for example a weight of 45 g / cm 2 - contains a size press 12 with here two rollers 14 for impregnating the continuous paper web 16 with acrylate.
  • the paper web 16 is pressure-impregnated between the rollers 14; the acrylate penetrates the paper pores or between the fibers as a prepolymer.
  • the impregnation can take place, for example, per m 2 with 15 g of acrylate - for example polyester, epoxy, urethane or full acrylate - and about 15 g of water per m 2 at a throughput speed of the paper web 16 of about 200 to 400 m / min at room temperature ,
  • the total water content of the impregnated paper produced in this way is approximately 20 to 25%.
  • the non-crosslinked end product can then - for example gravure printing - be printed; since the paper web 16 a smooth, dense surface with good wettability, offers especially in aqueous systems, arises as Result of a clean pressure build-up.
  • the printing roller is used as Part of the coating system, e.g. for wood reproduction, designed in line.
  • ESH lacquer After printing is done by application rollers on the paper web 16 an electron-curable topcoat so-called ESH lacquer, applied. Only then does the networking take place or the polymerization, preferably at about 170 kV a penetration depth of about 150 micrometers.
  • the crosslinked web product produced in the manner described looks, for example, as follows: on an underlying, impregnated paper layer of approximately 60 g / m 2 is an - optionally multi-layered - color layer with a thickness of up to 2 micrometers of approximately 1 to 2 g / m 2 arranged, on top of that top layer of ESH lacquer with 10 to 12 micrometers and 10 to 12 g / m 2 .
  • This end product can then be pressed, for example, with wood-based panels, such as chipboard, plywood, medium-density (MDF) or high-density (HDF) fiberboard, with the aid of adhesive.
  • MDF medium-density
  • HDF high-density
  • the method according to the invention also allows recycling of polymers or polymer-containing dispersions, emulsions or solutions in paper scraps; in paper production there are paper residues of up to about 10% of the total discharge, especially uncrossed paper scraps at the end the smoothing process or printing.
  • the size press 12 is used as shown in FIG. 2 Overflow 18 for unnecessary binder, for example an emulsion (acrylate / water) in a binder storage container 20 returned; so a pure one arises Binder cycle in a closed circuit.
  • unnecessary binder for example an emulsion (acrylate / water) in a binder storage container 20 returned; so a pure one arises Binder cycle in a closed circuit.
  • the inlet 24 of the storage container containing a metering valve 22 20 is with a mixing container 26 for raw materials connected, the underflow 28 with a filter 30, the one Return line 32 connects to the size press 12.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)
  • Making Paper Articles (AREA)

Abstract

The invention relates to a method for producing paper, mat, laminate or similar material web (16) using a binder feeding mechansim (12) and by subsequent hardening, in particular of a material web (16) having high plybond strength which is then varnished. In this method, a water-dilutable acrylate in the form of a binder is fed to the material web at the binder feeding mechansim (12). The material web is then hardened by an electron beam, after the water content has been evaporated off. In accordance with the invention, after feeding the binder, or after the impregnation process, the material web (16) containing the noncrosslinked acrylate is dried and the water is evaporated from the binder, preferably an emulsion. The material web (16) is then printed and crosslinkage or polymerization begun. After printing, a varnish is applied that is capable of being hardened by an electron-beam. The material or paper web can be pressure-impregnated with the acrylate. The binder present in noncrosslinked residual paper, or the excess binder from the impregnating procedure, in particular acrylate emulsion, is preferably returned (18, 20, 28, 32) to the binder feeding mechansim (12).

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von Papier, Papiervlies, Laminat od. dgl. Werkstoffbahn mit einer Bindemittelzuführeinrichtung in einer Papiermaschine sowie unter nachfolgendem Härten -- insbesondere einer mittels eines Lackiervorganges weiterbehandelten spaltfesten Werkstoffbahn --, der an der Bindemittelzuführeinrichtung ein wasserverdünnbares Acrylat in Form eines Bindemittels zugeführt wird, wobei die so behandelte Werkstoffbahn nach dem Abdunsten des Wasseranteils mit Elektronenstrahl gehärtet wird.The invention relates to a method for producing paper, Paper fleece, laminate or the like. Material web with a Binder feed device in a paper machine as well with subsequent hardening - especially one by means of of a painting process treated gap-proof material web - That on the binder feeder water-dilutable acrylate supplied in the form of a binder is, the treated material web after the Evaporation of the water content hardened with electron beam becomes.

Ein solches Verfahren beschreibt die DE. 44 13 619 C2, der zu entnehmen ist, daß es bekannt sei, insbesondere als Deckfolien zur abrieb-, kratz- und chemikalienbeständigen Beschichtung für die Holzwerkstoffindustrie zum Einsatz kommende Finishfolien durch das Lackieren von Substraten herzustellen. Sie werden als spaltfestes Papier bezeichnet und innerhalb der Papierherstellung in der Papiermaschine durch den Einsatz von härtbaren Mischungen aus Kondensationsharzen auf Basis von Melamin und Harnstoff sowie Acrylatdispersionen an einer als Bindemittelzuführeinrichtung dienenden Leimpresse erzeugt. Die Aushärtung solcher Harzmischungen erfolgt thermisch. Um weniger Wasseranteile behandeln zu müssen und die Trocknungskapazitäten vermindern zu können, wird mit der DE 44 13 619 C2 vorgeschlagen, an der Leimpresse der Papiermaschine ein System aus einem wasserverdünnbaren, elektronenstrahlhärtbaren Acrylat in Form einer Dispersion, Emulsion oder Lösung einzusetzen. Die Härtung erfolgt nach dem Abdunsten des Wasseranteils durch den Einsatz der Elektronenstrahltechnologie entweder direkt in der Papiermaschine oder außerhalb.DE describes such a process. 44 13 619 C2, the it can be seen that it is known, in particular as Cover films for abrasion, scratch and chemical resistant Coating for the wood-based panel industry used upcoming finish foils by painting substrates manufacture. They are called fissure-proof paper and within papermaking in the paper machine through the use of curable mixtures of condensation resins based on melamine and urea as well as acrylic dispersions on a binder supply device serving size press. The curing of such resin mixtures takes place thermally. Treat to less water and reduce drying capacity to be able, is proposed in DE 44 13 619 C2 the size press of the paper machine a system made of a water-dilutable, Electron beam curable acrylic in the form a dispersion, emulsion or solution. The Hardening takes place after the water content has evaporated the use of electron beam technology either directly in the paper machine or outside.

Der DE-A-27 27 312 ist ein Verfahren zur Erzeugung von spaltfesten -- dekorseitig ausgehärtetes Kunstharz aufweisenden -- Vergütungsbahnen auf der Basis von Papieren mit einem Flächengewicht ≤ 60 g/m2 zu entnehmen, welche auf die Oberflächen von Holzwerkstoffplatten aufgeleimt werden. Auf die für den Dekordruck bestimmte Papierseite wird zuerst mit dosiertem Walzenauftrag die Lösung oder Dispersion eines härtbaren Imprägnierharzes in vorbestimmter Menge auf die später zu bedruckende Seite aufgebracht, dann das imprägnierte Papier getrocknet und dekorativ bedruckt, wonach es -- gegebenenfalls nach Aufbringen einer Zwischenschicht -- mit der Lösung oder Dispersion eines härtbaren Harzes als Decklack beschichtet, nochmals getrocknet und ausgehärtet wird. Als härtbares Harz kann u. a. eine wäßrige Acrylharzlösung oder die wäßrige Lösung eines Aminoplastharzes eingesetzt werden.DE-A-27 27 312 describes a process for producing gap-resistant coating webs that have hardened synthetic resin on the basis of papers with a basis weight of ≤ 60 g / m 2 , which are glued to the surfaces of wood-based panels. The solution or dispersion of a curable impregnating resin is first applied in a predetermined amount to the side to be printed on the paper side intended for decor printing, then the impregnated paper is dried and decoratively printed, after which - if necessary after applying an intermediate layer - coated with the solution or dispersion of a curable resin as a topcoat, dried again and cured. An aqueous acrylic resin solution or the aqueous solution of an aminoplast resin can be used as the curable resin.

Der Erfinder hat sich die Aufgabe gestellt, das eingangs beschriebene Verfahren weitergehend zu verbessern, insbesondere die Bedruckbarkeit sowie die Verformbarkeit zu erhöhen, zudem soll die Wirtschaftlichkeit günstiger gestaltet werden.The inventor has set himself the task at the beginning to further improve the described method, in particular increase the printability and the deformability, In addition, the economy should be designed more cheaply become.

Zur Lösung dieser Aufgabe führt die Lehre des unabhängigen Patentanspruchs; die Unteransprüche geben günstige Weiterbildungen an.The teaching of the independent leads to the solution of this task Claim; the subclaims give favorable further training on.

Erfindungsgemäß wird die nach dem Zuführen des Bindemittels das nicht vernetzte Acrylat enthaltende Werkstoffbahn unter Verdunstung des Wassers aus dem Bindemittel getrocknet; die nicht vernetzte Werkstoffbahn wird dann bedruckt, nach dem Drucken ein mit Elektronenstrahl härtbarer Lack aufgebracht sowie anschließend die Vernetzung bzw. Polymerisation ausgelöst. Jenes nicht-vernetzte Acrylat enthaltende Produkt wird also nach dem Trocknen -- gegebenenfalls nach einseitigem Kalandrieren, d.h. Glätten über einer Walze -- bedruckt, wonach der mit Elektronenstrahl härtbare Lack (ESH-Lack) als Deckschicht aufgebracht und dann die Vernetzung bzw. Polymerisation ausgelöst wird; die unvernetzten Papierreste werden vorteilhafterweise in Zellstoff und Pigmente einerseits sowie die Emulsion aus Polymer und Wasser anderseits aufgeschlossen, wonach die Emulsion zum Imprägniervorgang rückgeführt wird.According to the invention after the addition of the binder the non-crosslinked acrylate material under Evaporation of water from the binder dried; the non-crosslinked material web is then printed after the Printing applied a varnish curable with electron beam and then triggered the crosslinking or polymerization. That non-cross-linked product containing acrylate after drying - if necessary after one-sided Calendering, i.e. Smoothing over a roller - printed, after which the one with electron beam curable lacquer (ESH lacquer) applied as a top layer and then the crosslinking or polymerization is triggered; the Uncrosslinked paper residues are advantageously used in pulp and pigments on the one hand and the emulsion of polymer and water on the other unlocked, after which the emulsion for impregnation is returned.

Der -- bevorzugt mittels Druckimprägnierung vorgesehene -- Imprägniervorgang soll mit Polyester, Epoxy-, Urethan- oder Vollacrylat bei Raumtemperatur insbesondere mit 200 bis 400 m/min Fördergeschwindigkeit durchgeführt sowie die Werkstoffbahn auf einer -- vorteilhafterweise eine verchromte Oberfläche anbietenden -- beheizten Walze kontaktgetrocknet werden, dies von etwa 20 bis 25 % Wasseranteil auf 2 bis 4 % Wasseranteil. The - preferably provided by pressure impregnation - Impregnation process should with polyester, epoxy, urethane or Full acrylate at room temperature, especially 200 to 400 m / min conveyor speed performed as well as the material web on one - advantageously a chromed one Offering surface - heated roller contact dried from 20 to 25% water content to 2 to 4 % Water content.

Die nicht vernetzte Werkstoffbahn wird mit dem Vorzug guter Benetzbarkeit und einer glatten Oberfläche dank des Kalandrierens beispielsweise im Tiefdruckverfahren bedruckt; die Polymere erhöhen die Flexibilität und die Verformbarkeit/Walkbarkeit der Werkstoffbahn und fördern eine saubere Druckausbildung. Die bei einem auf bisher üblichem Wege hergestellten Papier entstehenden Fehlstellen beim Tiefdruck samt einer Minderung der Prägnanz bzw. der Treue der Wiedergabe -- etwa bei Bedrucken mit einem Holzmuster -- treten hier nicht mehr auf.The non-crosslinked material web will be good with preference Wettability and a smooth surface thanks to calendering printed, for example, by gravure printing; the polymers increase flexibility and ductility the material web and promote a clean Pressure Education. The one in the usual way produced defects in gravure printing including a reduction in the conciseness or loyalty of the Playback - for example when printing with a wood pattern - no longer occur here.

Es wird deutlich, daß ganz allgemein flexiblere Herstellungs- und Gebrauchseigenschaften erreicht werden können.It becomes clear that generally more flexible manufacturing and performance characteristics can be achieved.

Von besonderer Bedeutung ist die Verwertung der Emulsion; die in unvernetzten Papierresten vorhandenen Polymere bzw. die Emulsion, Dispersion oder Lösung können ebenso zur Bindemittelzuführeinrichtung, insbesondere zur Leimpresse, rückgeführt werden, wie die aus dem Imprägniervorgang stammende überschüssige polymerhaltige Emulsion. The recycling of the emulsion is of particular importance; the polymers present in uncrosslinked paper residues or the emulsion, dispersion or solution can also be used for the binder feed device, especially for the size press, be recycled, such as that from the impregnation process excess polymer-containing emulsion.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele sowie anhand der Zeichnung; diese zeigt jeweils in schematischer Wiedergabe in

Fig. 1:
eine Skizze einer Papiermaschine zum Herstellen von Papier mit integrierter Leimpresse;
Fig. 2:
einen detallierten Ausschnitt im Bereich der Leimpresse.
Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawing; each shows a schematic representation in
Fig. 1:
a sketch of a paper machine for producing paper with an integrated size press;
Fig. 2:
a detailed section in the area of the size press.

Eine Papiermaschine 10 zum Herstellen von Papier oder Papiervlies -- beispielsweise eines Gewichtes von 45 g/cm2 -- enthält eine Leimpresse 12 mit hier zwei Walzen 14 zum Imprägnieren der durchlaufenden Papierbahn 16 mit Acrylat. In der Leimpresse 12 wird die Papierbahn 16 zwischen den Walzen 14 druckimprägniert; das Acrylat dringt als Präpolymer in die Papierporen bzw. zwischen die Fasern ein.A paper machine 10 for producing paper or paper fleece - for example a weight of 45 g / cm 2 - contains a size press 12 with here two rollers 14 for impregnating the continuous paper web 16 with acrylate. In the size press 12, the paper web 16 is pressure-impregnated between the rollers 14; the acrylate penetrates the paper pores or between the fibers as a prepolymer.

Die Imprägnierung kann beispielsweise je m2 mit 15 g Acrylat -- etwa Polyester, Epoxy-, Urethan- oder Vollacrylat -- sowie etwa 15 g Wasseranteil pro m2 bei einer Durchlaufgeschwindigkeit der Papierbahn 16 von etwa 200 bis 400 m/min bei Raumtemperatur erfolgen. Der Gesamtwasseranteil des so erzeugten imprägnierten Papieres beträgt etwa 20 bis 25 %.The impregnation can take place, for example, per m 2 with 15 g of acrylate - for example polyester, epoxy, urethane or full acrylate - and about 15 g of water per m 2 at a throughput speed of the paper web 16 of about 200 to 400 m / min at room temperature , The total water content of the impregnated paper produced in this way is approximately 20 to 25%.

Bei einem anschließenden Trocknungsvorgang verdunstet das Wasser aus der Emulsion; das Acrylat ist noch nicht vernetzt. Dieses Trocknen erfolgt durch Kontakttrocknung auf einer dampfbeheizten und verchromten Walze, wobei der Wasseranteil auf 2 bis 4 % sinkt. Die Präpolymere werden dadurch nicht beeinflußt.This evaporates during a subsequent drying process Water from the emulsion; the acrylate is not yet cross-linked. This drying is done by contact drying a steam-heated and chrome-plated roller, the water content drops to 2 to 4%. This will make the prepolymers unaffected.

Anschließend erfolgt ein Glättvorgang über einer weiteren Walze (einseitiges Kalandrieren). Then a smoothing process takes place over another Roller (one-sided calendering).

Das nicht vernetzte Endprodukt kann dann -- beispielsweise im Tiefdruckverfahren -- bedruckt werden; da die Papierbahn 16 eine glatte, dichte Oberfläche mit guter Benetzbarkeit, vor allem bei wässerigen Systemen anbietet, entsteht als Ergebnis eine saubere Druckausbildung.The non-crosslinked end product can then - for example gravure printing - be printed; since the paper web 16 a smooth, dense surface with good wettability, offers especially in aqueous systems, arises as Result of a clean pressure build-up.

Insbesondere bei einfarbigem Druck wird die Druckwalze als Teil der Beschichtungsanlage, z.B. für die Holzreproduktion, in Linie konzipiert.In particular in the case of single-color printing, the printing roller is used as Part of the coating system, e.g. for wood reproduction, designed in line.

Nach dem Drucken wird durch Auftragswalzen auf die Papierbahn 16 ein mit Elektronenstrahl härtbarer Decklack, ein sog. ESH-Lack, aufgetragen. Danach erst erfolgt die Vernetzung bzw. die Polymerisation, bevorzugt mit etwa 170 kV bei einer Eindringtiefe von etwa 150 Mikrometern.After printing is done by application rollers on the paper web 16 an electron-curable topcoat so-called ESH lacquer, applied. Only then does the networking take place or the polymerization, preferably at about 170 kV a penetration depth of about 150 micrometers.

Das in beschriebener Weise produzierte, vernetzte Bahnprodukt sieht dann beispielsweise folgendermaßen aus: Auf einer unterliegenden, imprägnierten Papierschicht von etwa 60 g/m2 ist eine -- gegebenenfalls mehrlagige -- Farbschicht einer Dicke bis zu 2 Mikrometern von etwa 1 bis 2 g/m2 angeordnet, darauf jene Deckschicht aus ESH-Lack mit 10 bis 12 Mikrometern sowie 10 bis 12 g/m2. Dieses Endprodukt kann dann z.B. mit Holzwerkstoffplatten, etwa Spanplatten, Sperrholz, mitteldichte (MDF) oder hochdichte (HDF) Faserplatten unter Zuhilfenahme von Klebstoff verpreßt werden.The crosslinked web product produced in the manner described then looks, for example, as follows: on an underlying, impregnated paper layer of approximately 60 g / m 2 is an - optionally multi-layered - color layer with a thickness of up to 2 micrometers of approximately 1 to 2 g / m 2 arranged, on top of that top layer of ESH lacquer with 10 to 12 micrometers and 10 to 12 g / m 2 . This end product can then be pressed, for example, with wood-based panels, such as chipboard, plywood, medium-density (MDF) or high-density (HDF) fiberboard, with the aid of adhesive.

Von Bedeutung ist vor allem, daß dank des beschriebenen Verfahrens mit einer kondensationsharzfreien und formaldehydfreien Dispersion, Suspension oder Lösung sehr gute Produkteigenschaften erzielt werden.It is particularly important that thanks to the described Process with a condensation resin-free and formaldehyde-free Dispersion, suspension or solution have very good product properties be achieved.

Das erfindungsgemäße Verfahren erlaubt auch das Rezyklieren von Polymeren bzw. polymerhaltigen Dispersionen, Emulsionen oder Lösungen in Papierresten; bei der Papierproduktion entstehen Papierreste im Umfang von bis etwa 10 % des Gesamtaustrages, vor allem unvernetzte Papierreste am Ende des Glättvorganges bzw. des Druckens. The method according to the invention also allows recycling of polymers or polymer-containing dispersions, emulsions or solutions in paper scraps; in paper production there are paper residues of up to about 10% of the total discharge, especially uncrossed paper scraps at the end the smoothing process or printing.

An der Leimpresse (Size-Presse) 12 wird gemäß Fig. 2 ein Überlauf 18 für nicht benötigtes Bindemittel, beispielsweise eine Emulsion (Acrylat/Wasser), in einen Bindemittelvorratsbehälter 20 rückgeführt; es entsteht also ein reiner Bindemittelzyklus in geschlossenem Kreislauf.The size press 12 is used as shown in FIG. 2 Overflow 18 for unnecessary binder, for example an emulsion (acrylate / water) in a binder storage container 20 returned; so a pure one arises Binder cycle in a closed circuit.

Der ein Dosierventil 22 enthaltende Zulauf 24 des Vorratsbehälters 20 ist mit einem Mischbehälter 26 für Rohstoffe verbunden, der Unterlauf 28 mit einem Filter 30, den eine Rückführleitung 32 mit der Leimpresse 12 verbindet.The inlet 24 of the storage container containing a metering valve 22 20 is with a mixing container 26 for raw materials connected, the underflow 28 with a filter 30, the one Return line 32 connects to the size press 12.

Die unvernetzten Papierreste werden aufgeschlossen und getrennt in

  • Zellstoffe und Pigmente sowie
  • Bindemittel (z. B. Emulsion; Wasser und Polymer),
wobei das Bindemittel -- wie beschrieben -- rückgeführt wird.The uncrosslinked scraps of paper are opened up and separated into
  • Pulps and pigments as well
  • Binders (e.g. emulsion; water and polymer),
wherein the binder - as described - is recycled.

Während im Rahmen der Erfindung das nicht benötigte Material in den Bindemittelzyklus zurückgelangt, mußte bislang der -- kondensationsharzhaltige -- Papierrest zu hohen Kosten als Sondermüll entsorgt werden.While in the context of the invention, the material not required So far it has had to get back into the binder cycle the - condensation resin-containing - residual paper at high cost be disposed of as special waste.

Claims (16)

  1. A method of producing paper, paper mat, laminate or the like web of material with a binding agent feed device (12) in a paper machine (10) and with subsequent hardening, in particular a splitting-resistant web (16) of material which is subjected to further treatment by means of a lacquering process, and to which a water-dilutable acrylate in the form of a binding agent is fed at the binding agent feed device, wherein the web of material treated in that way is hardened after evaporation of the water content by an electron beam, characterised in that the web (16) of material which after the feed of the binding agent contains the acrylate in non-crosslinked form is dried with evaporation of the water out of the binding agent, the non-crosslinked web of material is then printed upon, after the printing operation a lacquer which can be hardened with an electron beam is applied and then cross-linking or polymerisation is initiated.
  2. A method as set forth in claim 1 characterised by an emulsion as the binding agent which is preferably fed in a glue press (12).
  3. A method as set forth in claim 1 or claim 2 characterised in that polymers present in non-crosslinked paper residues or the polymer-bearing emulsion are returned to the binding agent feed device (12).
  4. A method as set forth in claim 1 or claim 3 characterised in that the web (16) of material or paper is impregnated with the acrylate using pressure.
  5. A method as set forth in one of claims 1 to 4 characterised in that the impregnation process is carried out with polyester, epoxy, urethane or full acrylate at ambient temperature at a conveyance speed of between 200 and 400 m/min.
  6. A method as set forth in claim 4 or claim 5 characterised in that the impregnation operation is effected with between 10 g and 20 g, preferably with about 15 g, of acrylate, and between 10 g and 20 g, preferably with about 15 g, of water content, per m2 of web (16) of paper of a weight of between 30 g and 60 g, preferably 45 g.
  7. A method as set forth in one of claims 1 to 6 characterised in that the web (16) of paper is contact-dried on a heated roller, in particular a roller with a chromium-plated surface.
  8. A method as set forth in claim 1 or claim 7 characterised in that the web (16) of paper is dried from between about 20 to 25% water content to between 2 and 4% water content.
  9. A method as set forth in claim 1 characterised in that the web (16) of paper is calendered prior to the printing operation.
  10. A method as set forth in one of claims 1 to 9 characterised by the application of pigmented or transparent electron beam-hardenable lacquer (EB-hardenable lacquer) after the printing operation.
  11. A method as set forth in at least one of claims 1 to 10 characterised in that the cross-linked web (16) of paper is produced with a subjacent impregnated paper layer, thereover a possibly multi-layer coating of ink or colour, and a cover layer covering same and consisting of EB-hardenable lacquer.
  12. A method as set forth in claim 11 characterised by a paper layer of about 60 g/m2, a layer of ink or colour of up to about 2 micrometres and a cover layer of between 10 and 12 g/m2.
  13. A method as set forth in claim 1 or claim 3 characterised in that excess binding agent from the impregnation process, in particular acrylate emulsion, is recycled.
  14. A method as set forth in claim 1, claim 3 or claim 13 characterised in that the non-crosslinked paper residues are broken up into cellulose and pigments on the one hand and the emulsion of polymer and water on the other hand, whereupon the emulsion is recycled to the impregnation process.
  15. A method as set forth in one of claims 1 to 14 characterised in that the binding agent or the emulsion is recycled through at least one filter (30).
  16. A method as set forth in one of claims 1 to 15 characterised in that emulsion coming from a mixing container (26) is mixed with the binding agent or the emulsion.
EP98936327A 1997-06-12 1998-06-10 Method for producing paper Expired - Lifetime EP0991816B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19724695 1997-06-12
DE19724695 1997-06-12
DE19734941 1997-08-12
DE19734941A DE19734941A1 (en) 1997-06-12 1997-08-12 Process for making paper
PCT/EP1998/003530 WO1998056990A1 (en) 1997-06-12 1998-06-10 Method for producing paper

Publications (2)

Publication Number Publication Date
EP0991816A1 EP0991816A1 (en) 2000-04-12
EP0991816B1 true EP0991816B1 (en) 2002-02-13

Family

ID=26037350

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Application Number Title Priority Date Filing Date
EP98936327A Expired - Lifetime EP0991816B1 (en) 1997-06-12 1998-06-10 Method for producing paper

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EP (1) EP0991816B1 (en)
AT (1) ATE213291T1 (en)
CA (1) CA2293623C (en)
PL (1) PL337327A1 (en)
TR (1) TR199903051T2 (en)
WO (1) WO1998056990A1 (en)

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CA2844586C (en) 2011-06-07 2019-05-14 Valspar Sourcing, Inc. Water-based coating for color sampling
FI20135745L (en) * 2013-07-05 2015-01-06 Walki Group Oy Method for treating a substrate comprising cellulose fibers and product manufactured with the method
US10933608B2 (en) 2016-08-19 2021-03-02 Wilsonart Llc Surfacing materials and method of manufacture
US11504955B2 (en) 2016-08-19 2022-11-22 Wilsonart Llc Decorative laminate with matte finish and method of manufacture
US11077639B2 (en) 2016-08-19 2021-08-03 Wilsonart Llc Surfacing materials and method of manufacture
US11745475B2 (en) 2016-08-19 2023-09-05 Wilsonart Llc Surfacing materials and method of manufacture
WO2019067983A1 (en) 2017-09-28 2019-04-04 Wilsonart Llc High pressure decorative laminate having a top layer of energy cured acrylated urethane polymer
CN107988847B (en) * 2017-12-11 2020-08-04 浙江海洋大学 Horizontal dipping dryer for decorative paper production

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US3578483A (en) * 1969-05-14 1971-05-11 Formica Corp Process for improving the printability of the surface of alpha-cellulose paper to be used as the decorative sheet in a decorative laminate
DE2727312C3 (en) * 1977-06-16 1979-11-22 Th. Goldschmidt Ag, 4300 Essen Process for the production of gap-proof synthetic resin that has hardened on the decor side! Compensation sheets based on papers with
DE2801396A1 (en) * 1978-01-13 1979-07-19 Sued West Chemie Gmbh THU-PLASTIC RESIN LOADED CARRIER MATERIALS, A PROCESS FOR THEIR PRODUCTION AND THEIR USE
DE2927746C2 (en) * 1979-07-10 1981-05-27 Th. Goldschmidt Ag, 4300 Essen Process for the production of a decorative finished effect film
DE2949306A1 (en) * 1979-12-07 1981-06-11 Letron GmbH, 8750 Aschaffenburg Synthetic veneer of paper fibre compsn. impregnated with resin - contg. equal wt. of long and short fibres, can be made on paper machine
FR2519663B2 (en) * 1981-05-12 1985-08-16 Jeandheurs Papeteries IMPROVEMENTS IN THE PROCESS FOR THE MANUFACTURE IN AQUEOUS MEDIA OF LEAVES OF FIBROUS MATERIALS CONTAINING LATEX OR THE LIKE AND / OR PHENOPLASTS OR AMINOPLASTS, NEW SHEETS THUS OBTAINED AND THEIR REUSE
US5152872A (en) * 1990-10-15 1992-10-06 Stone-Consolidated Inc. Apparatus for the wet end coating of paper
DE4302678A1 (en) * 1993-02-01 1994-08-04 Schoeller Felix Jun Papier Recyclable substrate
US5401899A (en) * 1993-04-15 1995-03-28 Westvaco Corporation Paper machine coating system
DE4413619C2 (en) * 1993-12-02 1996-09-26 Wkp Wuerttembergische Kunststo Process for making paper and laminates
SE9600003L (en) * 1995-03-21 1996-09-22 Claes G L Lundgren Coating of packaging material

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WO1998056990A1 (en) 1998-12-17
CA2293623A1 (en) 1998-12-17
PL337327A1 (en) 2000-08-14
CA2293623C (en) 2007-04-10
ATE213291T1 (en) 2002-02-15
TR199903051T2 (en) 2001-02-21
EP0991816A1 (en) 2000-04-12

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