EP0991816A1 - Method for producing paper - Google Patents

Method for producing paper

Info

Publication number
EP0991816A1
EP0991816A1 EP98936327A EP98936327A EP0991816A1 EP 0991816 A1 EP0991816 A1 EP 0991816A1 EP 98936327 A EP98936327 A EP 98936327A EP 98936327 A EP98936327 A EP 98936327A EP 0991816 A1 EP0991816 A1 EP 0991816A1
Authority
EP
European Patent Office
Prior art keywords
binder
paper
emulsion
acrylate
material web
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.)
Granted
Application number
EP98936327A
Other languages
German (de)
French (fr)
Other versions
EP0991816B1 (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
Original Assignee
Wkp Wuertt Kunststoffplatten-Werke & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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
Application granted granted Critical
Publication of EP0991816B1 publication Critical patent/EP0991816B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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.Material web with a binder feed device and with subsequent hardening - in particular a gap-resistant material web further treated by means of a painting process - to which a water-thinnable acrylate in the form of a binder is fed to the binder feed device the material web treated in this way is hardened with an electron beam after the water has evaporated.
  • DE 44 13 619 C2 proposes to use a system made of a water-thinnable, electron beam-curable acrylate in the form of a dispersion, emulsion or solution on the size press of the paper machine. After the water content has evaporated, the hardening takes place either directly in the paper machine or outside using the electron beam technology.
  • the inventor has set himself the task of further improving the method described in the introduction, in particular in particular to increase the printability and the deformability, and proposes as a solution the teaching of the independent patent claim; the subclaims indicate favorable further training.
  • the material web is dried after the binder has been fed in - especially after the acrylate impregnation - and the water evaporates from the binder.
  • the product from this process step contains uncrosslinked acrylate and is - if necessary after one-sided calendering, i. H. Smooth over one
  • the impregnation process which is preferably provided by means of pressure impregnation, should be carried out with polyester, epoxy, urethane or full acrylate at room temperature, in particular at a conveying speed of 200 to 400 m / min, and the
  • Material web can be contact-dried on a heated roller, advantageously offering a chrome-plated surface, from about 20 to 25% water to 2 to 4% water.
  • the non-crosslinked material web is printed with the advantage of good wettability and a smooth surface thanks to the calendering, for example in the gravure printing process; the polymers increase the flexibility and the deformability / walkability of the material web and promote a clean one
  • the uncrosslinked paper residues in pulp and pigments, on the one hand, and the polymer and water emulsion, on the other, are digested, after which the emulsion is returned to the impregnation process.
  • Fig. 2 a detailed section in the area of the size press.
  • 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, for example, per m 2 with 15 g of acrylate - about 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 Room temperature.
  • the total water content of the impregnated paper produced in this way is approximately 20 to 25%.
  • the water evaporates from the emulsion; the acrylate is not yet cross-linked. This drying takes place by contact drying on a steam-heated and chrome-plated roller, the water content falling to 2 to 4%. This does not affect the prepolymers.
  • the non-crosslinked end product can then be printed on, for example by gravure printing; since the paper web 16 offers a smooth, dense surface with good wettability, especially in aqueous systems, the result is a clean pressure formation.
  • the printing roller is used as part of the coating system, e.g. for wood reproduction, designed in line.
  • an electron-curable topcoat a so-called ESH lacquer
  • ESH lacquer is applied to the paper web 16 by application rollers. Only then does the crosslinking or polymerization take place, preferably at about 170 kV with 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-layer - 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 process according to the invention also allows the recycling of polymers or polymer-containing dispersions, emulsions or solutions in paper residues;
  • paper residues amount to up to about 10% of the total discharge, especially uncrosslinked paper residues at the end of the smoothing process or pressing.
  • an overflow 18 for unneeded binder for example an emulsion (acrylate / water)
  • a binder reservoir 20 according to FIG. 2 this results in a pure cycle of binders in a closed circuit.
  • the inlet 24 of the storage container 20 containing a metering valve 22 is connected to a mixing container 26 for raw materials, the underflow 28 to a filter 30, which connects a return line 32 to the size press 12.
  • the uncrosslinked paper residues are opened up and separated into
  • Binders e.g. emulsion; water and polymer

Landscapes

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

BESCHREIBUNG DESCRIPTION
Verfahren zum Herstellen von PapierProcess for making paper
Die Erfindung betrifft ein Verfahren zum Herstellen von Papier, Papiervlies, Laminat od. dgl. Werkstoffbahn mit einer Bindemittelzuführeinrichtung sowie unter nachfolgendem Härten -- insbesondere einer mittels eines Lackiervorganges weiterbehandelten spaltfesten Werkstoffbahn --, der an der Bindemittelzuführeinrichtung ein wasserverdunnbares 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 and with subsequent hardening - in particular a gap-resistant material web further treated by means of a painting process - to which a water-thinnable acrylate in the form of a binder is fed to the binder feed device the material web treated in this way is hardened with an electron beam after the water has evaporated.
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 Acry- latdispersionen an einer als Bindemittelzuführeinrichtung dienenden Leimpresse erzeugt. Die Aushärtung solcher Harz- mischungen 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 was- serverdünnbaren, 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.Such a process is described in DE 44 13 619 C2, which shows that it is known to produce finish foils used in particular as cover foils for abrasion, scratch and chemical-resistant coating for the wood-based panel industry by painting substrates. They are referred to as gap-proof paper and are produced in paper production in the paper machine through the use of hardenable mixtures of condensation resins based on melamine and urea and acrylic dispersions on a size press which serves as a binder feed device. Such resin mixtures are cured thermally. In order to have less water to treat and to be able to reduce the drying capacities, DE 44 13 619 C2 proposes to use a system made of a water-thinnable, electron beam-curable acrylate in the form of a dispersion, emulsion or solution on the size press of the paper machine. After the water content has evaporated, the hardening takes place either directly in the paper machine or outside using the electron beam technology.
Der Erfinder hat sich die Aufgabe gestellt, das eingangs beschriebene Verfahren weitergehend zu verbessern, insbe- sondere die Bedruckbarkeit sowie die Verformbarkeit zu erhöhen, und schlägt als Lösung die Lehre des unabhängigen Patentanspruchs vor; die Unteransprüche geben günstige Weiterbildungen an.The inventor has set himself the task of further improving the method described in the introduction, in particular in particular to increase the printability and the deformability, and proposes as a solution the teaching of the independent patent claim; the subclaims indicate favorable further training.
Erfindungsgemäß wird die Werkstoffbahn nach dem Zuführen des Bindemittels -- vor allem nach der Acrylat- Imprägnierung -- getrocknet und dabei das Wasser aus dem Bindemittel verdunstet. Das Produkt aus diesem Verfahrensschritt ent- hält nicht -vernetztes Acrylat und wird -- gegebenenfalls nach einseitigem Kalandrieren, d. h. Glätten über einerAccording to the invention, the material web is dried after the binder has been fed in - especially after the acrylate impregnation - and the water evaporates from the binder. The product from this process step contains uncrosslinked acrylate and is - if necessary after one-sided calendering, i. H. Smooth over one
Walze -- nachfolgend bedruckt; nach dem Druckvorgang wird vorteilhafterweise ein mit Elektronenstrahl härtbarer LackRoller - subsequently printed; after the printing process, an electronically curable lacquer is advantageously applied
(ESH-Lack) als Deckschicht aufgebracht und dann die Vernet- zung bzw. Polymerisation ausgelöst.(ESH lacquer) applied as a top layer and then the crosslinking or polymerization triggered.
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 dieThe impregnation process, which is preferably provided by means of pressure impregnation, should be carried out with polyester, epoxy, urethane or full acrylate at room temperature, in particular at a conveying speed of 200 to 400 m / min, and the
Werkstoffbahn auf einer -- vorteilhafterweise eine verchromte Oberfläche anbietenden -- beheizten Walze kontaktgetrocknet werden, dies von etwa 20 bis 25 % Wasseranteil auf 2 bis 4 % Wasseranteil.Material web can be contact-dried on a heated roller, advantageously offering a chrome-plated surface, from about 20 to 25% water to 2 to 4% water.
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 Verformbar- keit/Walkbarkeit der Werkstoffbahn und fördern eine saubereThe non-crosslinked material web is printed with the advantage of good wettability and a smooth surface thanks to the calendering, for example in the gravure printing process; the polymers increase the flexibility and the deformability / walkability of the material web and promote a clean one
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.Pressure training. The defects in rotogravure that occur with paper that was previously produced in the usual way, along with a reduction in the conciseness or fidelity of reproduction - for example when printing with a wood pattern - no longer occur here.
Es wird deutlich, daß ganz allgemein flexiblere Herstel- lungs- und Gebrauchseigenschaften erreicht werden können. Von besonderer Bedeutung ist die Verwertung der Emulsion; die in unvernetzten Papierresten vorhandenen Polymere bzw. die Emulsion, Dispersion oder Lösung können ebenso zur Bin- demittelzuführeinrichtung, insbesondere zur Leimpresse, rückgeführt werden, wie die aus dem Imprägniervorgang stammende überschüssige polymerhaltige Emulsion.It becomes clear that generally more flexible manufacturing and use properties can be achieved. 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 returned to the binder feed device, in particular to the size press, like the excess polymer-containing emulsion originating from the impregnation process.
Die unvernetzten Papierreste werden im Zellstoff und Pig- mente einerseits sowie die Emulsion aus Polymer und Wasser anderseits aufgeschlossen, wonach die Emulsion zum Imprägniervorgang rückgeführt wird. The uncrosslinked paper residues in pulp and pigments, on the one hand, and the polymer and water emulsion, on the other, are digested, after which the emulsion is returned to the impregnation process.
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 inFurther 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: eine Skizze einer Papiermaschine zum Herstellen von Papier mit integrierter Leimpresse;1: a sketch of a paper machine for producing paper with an integrated size press;
Fig. 2: einen detallierten Ausschnitt im Bereich der Leimpresse.Fig. 2: a detailed section in the area of the size press.
Eine Papiermaschine 10 zum Herstellen von Papier oder Pa- piervlies -- 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 Durchlaufge- schwindigkeit 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, for example, per m 2 with 15 g of acrylate - about 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 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 .During a subsequent drying process, the water evaporates from the emulsion; the acrylate is not yet cross-linked. This drying takes place by contact drying on a steam-heated and chrome-plated roller, the water content falling to 2 to 4%. This does not affect the prepolymers.
Anschließend erfolgt ein Glättvorgang über einer weiteren Walze (einseitiges Kalandrieren) . 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.Then a smoothing process takes place over another roller (one-sided calendering). The non-crosslinked end product can then be printed on, for example by gravure printing; since the paper web 16 offers a smooth, dense surface with good wettability, especially in aqueous systems, the result is a clean pressure formation.
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 monochrome 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, an electron-curable topcoat, a so-called ESH lacquer, is applied to the paper web 16 by application rollers. Only then does the crosslinking or polymerization take place, preferably at about 170 kV with 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-layer - 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 formalde- hydfreien Dispersion, Suspension oder Lösung sehr gute Produkteigenschaften erzielt werden.It is particularly important that, thanks to the process described, very good product properties can be achieved with a dispersion, suspension or solution which is free from condensation resin and formaldehyde.
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 Ge- samtaustrages, vor allem unvernetzte Papierreste am Ende des Glättvorganges bzw. des Drückens. An der Leimpresse (Size-Presse) 12 wird gemäß Fig. 2 ein Überlauf 18 für nicht benötigtes Bindemittel, beispielsweise eine Emulsion (Acrylat/Wasser) , in einen Bindemittel - vorratsbehälter 20 rückgeführt; es entsteht also ein reiner Bindemittelzyklus in geschlossenem Kreislauf.The process according to the invention also allows the recycling of polymers or polymer-containing dispersions, emulsions or solutions in paper residues; In the paper production, paper residues amount to up to about 10% of the total discharge, especially uncrosslinked paper residues at the end of the smoothing process or pressing. On the size press 12, an overflow 18 for unneeded binder, for example an emulsion (acrylate / water), is returned to a binder reservoir 20 according to FIG. 2; this results in a pure cycle of binders 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 20 containing a metering valve 22 is connected to a mixing container 26 for raw materials, the underflow 28 to a filter 30, which connects a return line 32 to the size press 12.
Die unvernetzten Papierreste werden aufgeschlossen und getrennt inThe uncrosslinked paper residues are opened up and separated into
• Zellstoffe und Pigmente sowie• pulps and pigments as well
• Bindemittel (z. B. Emulsion; Wasser und Polymer) ,Binders (e.g. emulsion; water and polymer),
wobei das Bindemittel -- wie beschrieben -- rückgeführt wird.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 is returned to the binder cycle, the paper residue - containing condensation resin - had to be disposed of as hazardous waste at high costs.

Claims

PATENTANSPRUCHE PATENT CLAIMS
1. Verfahren zum Herstellen von Papier, Papiervlies, La- minat od. dgl. Werkstoffbahn mit einer Bindemittelzuführeinrichtung sowie unter nachfolgendem Härten, insbesondere einer mittels eines Lackiervorganges weiterbehandelten spaltfesten Werkstoffbahn, der an der Bindemittelzuführeinrichtung ein wasserverdünnba- res Acrylat in Form eines Bindemittels zugeführt wird, wobei die so behandelte Werkstoffbahn nach dem Abdunsten des Wasseranteils mit Elektronenstrahl gehärtet wird,1. Process for the production of paper, paper fleece, laminate or the like. Material web with a binder feed device and with subsequent hardening, in particular a gap-resistant material web further treated by means of a painting process, to which a water-thinnable acrylate in the form of a binder is fed at the binder feed device The material web treated in this way is hardened with an electron beam after the water has evaporated,
dadurch gekennzeichnet,characterized,
daß nach dem Zuführen des Bindemittels die das nicht vernetzte Acrylat enthaltende Werkstoffbahn getrocknet und das Wasser aus dem Bindemittel verdunstet wird, daß die Werkstoffbahn dann bedruckt und anschließend die Vernetzung bzw. Polymerisation ausgelöst wird.that after the addition of the binder, the non-crosslinked acrylate material web is dried and the water is evaporated from the binder, that the material web is then printed and then the crosslinking or polymerization is triggered.
2. Verfahren nach Anspruch 1, gekennzeichnet durch eine Emulsion als Bindemittel, die bevorzugt in einer2. The method according to claim 1, characterized by an emulsion as a binder, preferably in a
Leimpresse zugeführt wird.Size press is fed.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß nach dem Drucken ein mit Elektronen- strahl härtbarer Lack aufgebracht wird,3. The method according to claim 1 or 2, characterized in that after printing, an electron-curable lacquer is applied,
4. Verfahren nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß die Werkstoff- bzw. Papierbahn mit dem Acrylat druckimprägniert wird. 4. The method according to claim 1 or 3, characterized in that the material or paper web is pressure-impregnated with the acrylate.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Imprägniervorgang mit Polyester, Epoxy- , Urethan- oder Vollacrylat bei Raumtemperatur mit 200 bis 400 m/min Fördergeschwindigkeit durchgeführt wird.5. The method according to any one of claims 1 to 4, characterized in that the impregnation process with polyester, epoxy, urethane or full acrylate is carried out at room temperature with a conveying speed of 200 to 400 m / min.
6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Imprägnierung mit 10 g bis 20 g, bevorzugt mit etwa 15 g, Acrylat und 10 g bis 20 g, bevorzugt mit etwa 15 g, Wasseranteil je m2 Papierbahn eines Gewichts von 30 g bis 60 g, bevorzugt 45 g, erfolgt.6. The method according to claim 4 or 5, characterized in that the impregnation with 10 g to 20 g, preferably with about 15 g, acrylate and 10 g to 20 g, preferably with about 15 g, water content per m 2 paper web of a weight of 30 g to 60 g, preferably 45 g, takes place.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Papierbahn auf einer beheizten Walze, insbesondere einer Walze mit verchromter Oberfläche, kontaktgetrocknet wird.7. The method according to any one of claims 1 to 6, characterized in that the paper web is contact dried on a heated roller, in particular a roller with a chromed surface.
8. Verfahren nach Anspruch 1 oder 7, dadurch gekenn- zeichnet, daß die Papierbahn von etwa 20 bis 25 %8. The method according to claim 1 or 7, characterized in that the paper web of about 20 to 25%
Wasseranteil auf 2 bis 4 % Wasseranteil getrocknet wird.Water content is dried to 2 to 4% water content.
9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Papierbahn vor dem Druckvorgang kalandriert wird.9. The method according to claim 1, characterized in that the paper web is calendered before the printing process.
10. Verfahren nach einem der Ansprüche 1 bis 9, gekennzeichnet durch das Auftragen pigmentierten oder durchsichtigen elektronenstrahlhärtbaren Lackes (ESH-10. The method according to any one of claims 1 to 9, characterized by the application of pigmented or transparent electron-beam-curable lacquer (ESH-
Lackes) nach dem Druckvorgang.Varnish) after the printing process.
11. Verfahren nach wenigstens einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, daß die vernetzte Papier- bahn mit einer untenliegenden imprägnierten Papierschicht darüber einer gegebenenfalls mehrlagigen Farbschicht und einer diese abdeckenden Deckschicht aus ESH-Lack hergestellt wird. 11. The method according to at least one of claims 1 to 10, characterized in that the cross-linked paper web with an underlying impregnated paper layer above an optionally multi-layer color layer and a covering layer covering this is made of ESH lacquer.
12. Verfahren nach Anspruch 11, gekennzeichnet durch eine Papierschicht mit etwa 60 g/m2, eine Farbschicht bis etwa 2 Mikrometer und eine Deckschicht von 10 bis 12 g/m2.12. The method according to claim 11, characterized by a paper layer with about 60 g / m 2 , a color layer to about 2 microns and a cover layer of 10 to 12 g / m 2 .
13. Verfahren zum Herstellen von Papier, Papiervlies, Laminat od. dgl. Werkstoffbahn, vor allem einer mittels eines Lackiervorganges weiterbehandelten spaltfesten Papierbahn, der ein wasserverdunnbares, elektronen- strahlhärtbares Acrylat in Form einer Emulsion, einer Dispersion oder einer Lösung zugeführt wird, insbesondere Verfahren nach einem der voraufgehenden Patentansprüche, dadurch gekennzeichnet, daß in unver- netzten Papierresten vorhandene Polymere bzw. die polymerhaltige Emulsion zur Bindemittelzuführeinrichtung rückgeführt werden.13. Process for the production of paper, paper fleece, laminate or the like. Material web, in particular a gap-resistant paper web further treated by means of a painting process, to which a water-thinnable, electron-beam-curable acrylate in the form of an emulsion, a dispersion or a solution is fed, in particular processes according to one of the preceding claims, characterized in that polymers present in uncrosslinked paper residues or the polymer-containing emulsion are returned to the binder feed device.
14. Verfahren nach Anspruch 13, dadurch gekennzeichnet, daß aus dem Imprägniervorgang überschüssiges Bindemittel, insbesondere Acrylatemulsion, rückgeführt wird.14. The method according to claim 13, characterized in that excess binder, in particular acrylic emulsion, is returned from the impregnation process.
15. Verfahren nach Anspruch 13 oder 14, dadurch gekenn- zeichnet, daß die unvernetzten Papierreste im Zellstoff und Pigmente einerseits sowie die Emulsion aus Polymer und Wasser anderseits aufgeschlossen werden, wonach die Emulsion zum Imprägniervorgang rückgeführt wird.15. The method according to claim 13 or 14, characterized in that the uncrosslinked paper residues in the pulp and pigments on the one hand and the emulsion of polymer and water on the other hand are digested, after which the emulsion is returned to the impregnation process.
16. Verfahren nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, daß das Bindemittel bzw. die Emulsion durch wenigstens einen Filter rückgeführt wird.16. The method according to any one of claims 13 to 15, characterized in that the binder or the emulsion is recycled through at least one filter.
17. Verfahren nach einem der Ansprüche 12 bis 15, dadurch gekennzeichnet, daß dem Bindemittel bzw. der Emulsion aus einem Mischbehälter kommende Emulsion zugemischt wird. 17. The method according to any one of claims 12 to 15, characterized in that the binder or the emulsion from a mixing container is added 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
DE19734941A DE19734941A1 (en) 1997-06-12 1997-08-12 Process for making paper
DE19734941 1997-08-12
PCT/EP1998/003530 WO1998056990A1 (en) 1997-06-12 1998-06-10 Method for producing paper

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

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

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WO2019067983A1 (en) 2017-09-28 2019-04-04 Wilsonart Llc High pressure decorative laminate having a top layer of energy cured acrylated urethane polymer
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CA2293623C (en) 2007-04-10
EP0991816B1 (en) 2002-02-13
ATE213291T1 (en) 2002-02-15
TR199903051T2 (en) 2001-02-21
PL337327A1 (en) 2000-08-14
CA2293623A1 (en) 1998-12-17
WO1998056990A1 (en) 1998-12-17

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