EP0438743A1 - Coating process and apparatus for coating a moving web of paper or paperboard - Google Patents

Coating process and apparatus for coating a moving web of paper or paperboard Download PDF

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Publication number
EP0438743A1
EP0438743A1 EP90124884A EP90124884A EP0438743A1 EP 0438743 A1 EP0438743 A1 EP 0438743A1 EP 90124884 A EP90124884 A EP 90124884A EP 90124884 A EP90124884 A EP 90124884A EP 0438743 A1 EP0438743 A1 EP 0438743A1
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Prior art keywords
coating
roller
layer
web
application
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EP90124884A
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German (de)
French (fr)
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EP0438743B1 (en
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Martin Dr. Kustermann
Hans-Peter Dr. Sollinger
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JM Voith GmbH
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JM Voith GmbH
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material

Definitions

  • the invention relates to a coating method according to the preamble of claim 1 and corresponding application devices.
  • a method for coating running material webs with two successive coating processes, the layer applied first being still moist when the second layer is applied, is known from US Pat. No. 3,202,536.
  • the two coating stations are arranged here on a single roller guiding the web as well as on two successive rollers.
  • a so-called air brush is used as the final smoothing element.
  • a corresponding application device with a roller guiding the web on a coating device is also known from CA-PS 882 640.
  • the layer is applied by an application roller and scraped off by a doctor blade. It is envisaged that a mixture for the coating mass of kaolin-containing mass as well as mass consisting of starch, protein or thermoplastic synthetic resin is used.
  • the first application layer has a relatively high consistency, i.e. with a solids content of more than 55% and the second layer has a much lower consistency with a lower solids content of at most 45%, the main proportion being kaolin.
  • the first layer is applied very thickly, so that it can first be smoothed using a doctor blade.
  • the object of the invention is to provide a device and a method with which a perfect stroke application can also be achieved. This applies in particular to the use in cardboard, where the roughness of the surface of the raw cardboard is relatively large, so that with other coating processes, e.g. use a doctor blade as a leveling element, uncovered areas can appear on the protruding "mountains".
  • the application mass is imprinted on the web from the surface of the first web guide roller, and there is certainly a brief deformation of the paper web.
  • the amount applied or transferred is relatively small, in such a way that solid particles of the coating slip remain on the "mountains" of micro-roughness.
  • the pressing pressure and the hydraulic pressure in the press nip result in a certain dewatering of the coating slip of the first layer, but a moisture content of the coating slip remains.
  • the "pre-dewatering" in the press nip ensures that the coating compound adheres to the "mountains" of the web everywhere. A certain intermediate drying before the second layer application is possible.
  • the second application layer is only metered by means of the grooves of a roller doctor provided with circumferential grooves, without acting on the layer with a further smoothing element.
  • a bleeding is achieved to a sufficient extent, so that further smoothing, combined with possible disadvantages of scraping, is superfluous.
  • the web is passed through a press nip formed between two rollers 1 and 2.
  • the one roller which is provided with a rubberized surface, is assigned an application unit which has a nozzle chamber 6 and, at its outlet end, a roller doctor blade 7 provided with circumferential grooves and a holder 8 for the same.
  • the hardness of the rubber coating of the roller 1 can be between 0 and 200, preferably 10 and 70 P and J.
  • the application quantity for the case of cardboard is 6 to 40 ml / m2, preferably 12 to 22 ml / m2.
  • the second layer is applied in a comparable arrangement with a doctor blade 11 and its holder 12 and nozzle chamber 9, but a leveling blade or a smooth doctor blade at point 10 can also be used as a leveling element.
  • the consistencies in question are between 50 and 70%, preferably 50 and 60% maximum for the first application layer and between 60 and 70% maximum for the second application layer. It is to be regarded as favorable if a nozzle chamber 6, 9 is provided as the application unit, at the outlet-side end of which a roller doctor blade 7, 11 with its holder is close to the surface to be coated 8, 12 is arranged. So here you have the advantage over the air brush method that you can work with a relatively high consistency overall, but especially with the second application layer.
  • the line pressures in the press nip between the first two rolls 1 and 2 are between 5 and 60 kN / m, preferably 20 to 40 kN / m.
  • the arrangement according to FIG. 2 has only a total of two web guide rollers 21 and 22, each being assigned an application device of the type described. This arrangement is possible in the case of cardboard because it expands less than paper due to the moistening in the coating unit.
  • FIG. 4 also shows that a transfer roller 17 for the coating slip can also be used for the second coating device. It is then to be doctored by one of the known metering elements.
  • the first application layer can be dosed with a doctor blade instead of with the grooves of a roller squeegee, but here the work of the doctor blade must be monitored very closely.

Abstract

In the process for coating preferably paperboard, provision is made initially for a coating substance, a very small amount of which is applied to the surface of the one roller 1, to be reproduced on the web W in a pressing gap formed between two rollers 1 and 2, so that a very thin coating remains on the web which, however, covers all places, including the "elevations" of the micro-roughness. The second layer can then be applied to the still damp first layer and metered using customary means. In this case, the first layer is preferably metered on the outer surface of the first roller 1 by means of the circumferential grooves of a roller doctor. The same can also take place in respect of the second coating on the web W. <IMAGE>

Description

Die Erfindung betrifft ein Beschichtungsverfahren entsprechend dem Oberbegriff des Patentanspruchs 1 sowie entsprechende Auftragseinrichtungen.The invention relates to a coating method according to the preamble of claim 1 and corresponding application devices.

Ein Verfahren zur Beschichtung laufender Warenbahnen mit zwei aufeinanderfolgenden Beschichtungsvorgängen, wobei die zuerst aufgetragene Schicht noch feucht ist, wenn die zweite Schicht aufgetragen wird, ist bekannt aus US-PS 3,202,536. Die beiden Beschichtungsstationen sind hier sowohl an einer einzigen, die Bahn führenden Walze angeordnet als auch an zwei aufeinanderfolgenden Walzen. Als abschließendes Glättungselement wird eine sogenannte Luftbürste verwendet. Eine Auftragseinrichtung entsprechender Art mit jeweils die Bahn an einer Beschichtungseinrichtung führenden Walze ist auch bekannt aus CA-PS 882 640. In diesem Fall wird die Schicht jeweils durch eine Auftragswalze aufgetragen und durch eine Streichklinge abgeschabt. Es ist vorgesehen, daß eine Mischung für die Beschichtungsmasse aus kaolinhaltiger Masse sowie aus Stärke, Protein oder thermoplastischem Kunstharz bestehender Masse benutzt wird.A method for coating running material webs with two successive coating processes, the layer applied first being still moist when the second layer is applied, is known from US Pat. No. 3,202,536. The two coating stations are arranged here on a single roller guiding the web as well as on two successive rollers. A so-called air brush is used as the final smoothing element. A corresponding application device with a roller guiding the web on a coating device is also known from CA-PS 882 640. In this case the layer is applied by an application roller and scraped off by a doctor blade. It is envisaged that a mixture for the coating mass of kaolin-containing mass as well as mass consisting of starch, protein or thermoplastic synthetic resin is used.

Im Falle der US 3,202,536 ist vorgesehen, daß die erste Auftragsschicht eine relativ hohe Konsistenz, d.h. mit einem Feststoffgehalt von mehr als 55 % und die zweite Schicht eine wesentlich niedrigere Konsistenz mit einem niedrigeren Feststoffgehalt von höchstens 45 % aufweist, wobei der Hauptanteil jeweils Kaolin ist.In the case of US 3,202,536 it is provided that the first application layer has a relatively high consistency, i.e. with a solids content of more than 55% and the second layer has a much lower consistency with a lower solids content of at most 45%, the main proportion being kaolin.

Entscheidend ist jedoch dabei, daß die erste Schicht sehr dick aufgetragen wird, so daß sie zunächst mittels Streichklinge geglättet werden kann.It is crucial, however, that the first layer is applied very thickly, so that it can first be smoothed using a doctor blade.

Die Anwendung einer Luftbürste ist heute jedoch wegen der großen Bahngeschwindigkeiten beim Auftragen sehr problematisch, praktisch kann die Luftbürste nur bis zu Geschwindigkeiten von 500 m/min. benutzt werden. Dies ist bei dem heutigen Konkurrenzdruck ein ganz schwerer Nachteil, obwohl die Luftbürste den großen Vorteil hat, daß mit ihr trotz relativ sparsamem Auftrag ein einwandfreier Strichauftrag erzielt werden kann.However, the use of an air brush is very problematic today due to the high web speeds when applying it. In practice, the air brush can only operate at speeds of up to 500 m / min. to be used. With today's competitive pressure, this is a very serious disadvantage, although the air brush has the great advantage that it can be used to achieve a perfect stroke despite the relatively economical application.

Die Aufgabe der Erfindung ist es, eine Einrichtung sowie ein Verfahren anzugeben, mit welchem ebenfalls ein einwandfreier Strichauftrag erzielbar ist. Dies gilt insbesondere für die Anwendung bei Karton, wo ja die Rauhigkeit der Oberfläche des Rohkartons relativ groß ist, so daß bei anderen Streichverfahren, die z.B. eine Streichklinge als Egalisierelement benutzen, es an den hervorstehenden "Bergen" zu unbedeckten Stellen kommen kann.The object of the invention is to provide a device and a method with which a perfect stroke application can also be achieved. This applies in particular to the use in cardboard, where the roughness of the surface of the raw cardboard is relatively large, so that with other coating processes, e.g. use a doctor blade as a leveling element, uncovered areas can appear on the protruding "mountains".

Erfindungsgemäß wird praktisch beim ersten Schichtauftrag mittels des Preßdruckes in dem zwischen den beiden zusammenwirkenden Walzen gebildeten Preßspalt die Auftragsmasse von der Oberfläche der ersten Bahnführungswalze auf die Warenbahn abgedruckt, wobei es sicher zu einer kurzzeitigen Verformung der Papierbahn kommt. Die aufgetragene bzw. übertragene Menge ist dabei relativ gering, und zwar derart, daß ein Verbleiben von Feststoffpartikeln der Streichmasse auch auf den "Bergen" der Mikrorauhigkeit gewährleistet ist. Durch den Preßdruck und den hydraulischen Druck in dem Preßspalt erfolgt eine gewisse Entwässerung der Streichmasse der ersten Schicht, es bleibt aber ein Feuchtigkeitsgehalt der Streichmasse erhalten. Durch die "Vorentwässerung" im Preßspalt wird ein Anhaften der Streichmasse auch an den "Bergen" der Bahn überall sichergestellt. Eine gewisse Zwischentrocknung vor dem zweiten Schichtauftrag ist möglich.According to the invention, in the first layer application, by means of the pressure in the press nip formed between the two interacting rollers, the application mass is imprinted on the web from the surface of the first web guide roller, and there is certainly a brief deformation of the paper web. The amount applied or transferred is relatively small, in such a way that solid particles of the coating slip remain on the "mountains" of micro-roughness. The pressing pressure and the hydraulic pressure in the press nip result in a certain dewatering of the coating slip of the first layer, but a moisture content of the coating slip remains. The "pre-dewatering" in the press nip ensures that the coating compound adheres to the "mountains" of the web everywhere. A certain intermediate drying before the second layer application is possible.

Für die Beschichtung von Karton hat es sich als günstig herausgestellt, wenn die zweite Auftragsschicht mittels der Rillen einer mit Umfangsrillen versehenen Rollrakel nur dosiert wird, ohne daß auf die Schicht mit einem weiteren Glättungselement eingewirkt wird. Bei einer entsprechenden Einstellung der Konsistenz der Streichmasse wird ein Verlaufen in ausreichendem Maße erreicht, so daß ein weiteres Glätten, verbunden mit eventuellen Nachteilen des Abschabens überflüssig ist.For the coating of cardboard, it has proven to be advantageous if the second application layer is only metered by means of the grooves of a roller doctor provided with circumferential grooves, without acting on the layer with a further smoothing element. With an appropriate adjustment of the consistency of the coating slip, a bleeding is achieved to a sufficient extent, so that further smoothing, combined with possible disadvantages of scraping, is superfluous.

Nachfolgend wird die Erfindung anhand der in den Figuren der Zeichnung dargestellten Ausführungsbeispiele erläutert, die jeweils prinzipmäßig das Auftragsverfahren darstellen.The invention is explained below on the basis of the exemplary embodiments illustrated in the figures of the drawing, each of which in principle represents the application method.

In Figur 1 ist vorgesehen, daß die Warenbahn durch einen zwischen zwei Walzen 1 und 2 gebildeten Preßspalt geführt wird. Dabei ist der einen Walze, die mit einer gummierten Oberfläche versehen ist, ein Auftragswerk zugeordnet, das eine Düsenkammer 6 und an ihrem austrittsseitigen Ende eine mit Umfangsrillen versehene Rollrakel 7 und einen Halter 8 für dieselbe aufweist. Die Härte des Gummiüberzugs der Walze 1 kann zwischen 0 und 200, vorzugsweise 10 und 70 P u.J, betragen. Die Auftragsmenge für den Fall von Karton ist mit 6 bis 40 ml/m², vorzugsweise 12 bis 22 ml/m², zu bemessen. Die zweite Schicht wird in einer vergleichbaren Anordnung mit Rollrakel 11 und deren Halter 12 sowie Düsenkammer 9 aufgetragen, wobei jedoch als Egalisierelement auch eine Streichklinge oder eine glatte Rollrakel an der Stelle 10 in Frage kommt.In Figure 1 it is provided that the web is passed through a press nip formed between two rollers 1 and 2. In this case, the one roller, which is provided with a rubberized surface, is assigned an application unit which has a nozzle chamber 6 and, at its outlet end, a roller doctor blade 7 provided with circumferential grooves and a holder 8 for the same. The hardness of the rubber coating of the roller 1 can be between 0 and 200, preferably 10 and 70 P and J. The application quantity for the case of cardboard is 6 to 40 ml / m², preferably 12 to 22 ml / m². The second layer is applied in a comparable arrangement with a doctor blade 11 and its holder 12 and nozzle chamber 9, but a leveling blade or a smooth doctor blade at point 10 can also be used as a leveling element.

Die in Frage kommenden Konsistenzen, d.h. Feststoffgehalte, liegen für die erste Auftragsschicht zwischen 50 und 70 %, vorzugsweise 50 und 60 % maximal und für die zweite Auftragsschicht zwischen 60 und 70 % maximal. Es ist als günstig anzusehen, wenn als Auftragswerk jeweils eine Düsenkammer 6, 9 vorgesehen ist, an deren austrittsseitigem Ende in der Nähe der zu beschichtenden Oberfläche eine Rollrakel 7, 11 mit deren Halter 8, 12 angeordnet ist. Man hat also hier den Vorteil gegenüber dem Luftbürstenverfahren, daß man mit relativ hoher Konsistenz insgesamt, insbesondere aber bei der zweiten Auftragsschicht arbeiten kann. Die Liniendrücke im Preßspalt zwischen den beiden ersten Walzen 1 und 2 betragen zwischen 5 und 60 kN/m, vorzugsweise 20 bis 40 kN/m.The consistencies in question, ie solids contents, are between 50 and 70%, preferably 50 and 60% maximum for the first application layer and between 60 and 70% maximum for the second application layer. It is to be regarded as favorable if a nozzle chamber 6, 9 is provided as the application unit, at the outlet-side end of which a roller doctor blade 7, 11 with its holder is close to the surface to be coated 8, 12 is arranged. So here you have the advantage over the air brush method that you can work with a relatively high consistency overall, but especially with the second application layer. The line pressures in the press nip between the first two rolls 1 and 2 are between 5 and 60 kN / m, preferably 20 to 40 kN / m.

Die Anordnung nach Figur 2 hat nur insgesamt zwei Bahnführungswalzen 21 und 22, wobei jeder eine Auftragseinrichtung der beschriebenen Art zugeordnet ist. Diese Anordnung ist im Falle von Karton möglich, weil dieser sich durch die Befeuchtung im Streichwerk weniger dehnt als Papier.The arrangement according to FIG. 2 has only a total of two web guide rollers 21 and 22, each being assigned an application device of the type described. This arrangement is possible in the case of cardboard because it expands less than paper due to the moistening in the coating unit.

Bei Karton ist eine günstige Möglichkeit, als Dosierelement eine mit Umfangsrillen versehene Rollrakel 11 mit Halter 12 am auslaufenden Ende der Düsenkammer 9 für die zweite Beschichtung (Enddosierung) vorzusehen und danach kein weiteres Glättelement anzuwenden. Dies ist in Figur 3 dargestellt. Damit kann ein sehr guter Strichauftrag bei relativ sparsamem Einsatz von Streichmasse erreicht werden.In the case of cardboard, an inexpensive possibility is to provide a roller doctor blade 11 with a holder 12 at the outlet end of the nozzle chamber 9 for the second coating (final dosage) as a dosing element and then to use no further smoothing element. This is shown in Figure 3. A very good coat application can be achieved with a relatively economical use of coating slip.

In Figur 4 ist noch dargestellt, daß für die zweite Beschichtungseinrichtung auch eine Übertragungswalze 17 für die Streichmasse Verwendung finden kann. Es ist danach ein Abrakeln durch eines der bekannten Dosierelemente vorzusehen.FIG. 4 also shows that a transfer roller 17 for the coating slip can also be used for the second coating device. It is then to be doctored by one of the known metering elements.

Man kann in einem bestimmten Anwendungsbereich, im Fall von Leimauftrag für Papier, die erste Auftragsschicht statt mit den Rillen einer Rollrakel auch mit einer Streichklinge dosieren, muß hier aber sehr genau das Arbeiten der Streichklinge überwachen.In a certain area of application, in the case of glue application for paper, the first application layer can be dosed with a doctor blade instead of with the grooves of a roller squeegee, but here the work of the doctor blade must be monitored very closely.

Claims (11)

Verfahren zur Beschichtung laufender Warenbahnen aus Papier oder Karton, wobei unmittelbar nacheinander zwei Schichten aufeinandergelegt werden, während die erste Schicht noch feucht ist und sowohl für den ersten als auch den zweiten Beschichtungsvorgang mindestens eine die Warenbahn führende, rotierbare Walze vorgesehen ist und mindestens die zweite Schicht direkt auf der Bahn aufgetragen und dosiert wird, dadurch gekennzeichnet, daß beim ersten Beschichtungsvorgang mittels einer Rollrakel, die mit feinen Umfangsrillen oder mit spiralförmigen Rillen, die jeweils eng aneinander liegen, versehen ist, die Auftragsschicht in so geringer Menge auf die Mantelfläche der die Warenbahn führenden, ersten Walze (1) dosiert aufgetragen wird, daß in einem nachgeschalteten, zwischen einer Gegenwalze (2) und der ersten Walze (1) gebildeten Preßspalt die Streichmasse auf die durch den Preßspalt geführte Warenbahn abgedruckt wird, so daß überall eine zumindest dünne Schicht an Beschichtungsmasse insbesondere hinsichtlich des festen bzw. Pigmentanteils verbleibt und daß der Feststoffgehalt der Beschichtungsmasse für die erste Auftragsschicht maximal 70 % beträgt.Process for coating running webs of paper or cardboard, in which two layers are laid one after the other while the first layer is still moist and at least one rotatable roller guiding the web and at least the second layer is provided for both the first and the second coating process is applied and dosed directly on the web, characterized in that in the first coating process by means of a doctor blade, which is provided with fine circumferential grooves or with spiral-shaped grooves, which are closely adjacent to each other, the application layer in such a small amount on the outer surface of the web leading, first roller (1) is applied in doses, that in a downstream press nip formed between a counter-roller (2) and the first roller (1) the coating slip is printed onto the web passed through the press nip, so that an at least thin layer is everywhere to coating Ngs mass remains in particular with regard to the solid or pigment content and that the solids content of the coating composition for the first application layer is a maximum of 70%. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Feststoffgehalt der Beschichtungsmasse für die erste Auftragsschicht zwischen 50 und 60 % beträgt.A method according to claim 1, characterized in that the solids content of the coating composition for the first application layer is between 50 and 60%. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß bei der Beschichtung von Karton die Auftragsmenge für die erste Auftragsschicht zwischen 6 und 40 ml/m², insbesondere zwischen 12 und 22 ml/m², beträgt.A method according to claim 1 or 2, characterized in that when coating cardboard, the application quantity for the first application layer is between 6 and 40 ml / m², in particular between 12 and 22 ml / m². Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die zweite Beschichtung an der zweiten Bahnführungswalze durch eine mit Umfangsrillen versehene Rollrakel dosiert wird, wonach die Warenbahn von der zweiten Bahnführungswalze (3) abgeleitet wird, und daß der Feststoffanteil der zweiten Beschichtungsmasse maximal 70 % beträgt.Method according to one of claims 1 to 3, characterized in that the second coating on the second web guide roller is metered by a roller doctor provided with circumferential grooves, after which the material web is diverted from the second web guide roller (3), and that the solids content of the second coating mass is at a maximum Is 70%. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Feststoffanteil der zweiten Beschichtungsmasse zwischen 60 und 70 % beträgt.Method according to one of claims 1 to 4, characterized in that the solids content of the second coating composition is between 60 and 70%. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Feststoffgehalt der zweiten Auftragsschicht mindestens 10 % absolut höher als der ersten Auftragsschicht ist.Method according to one of claims 1 to 4, characterized in that the solids content of the second application layer is at least 10% absolutely higher than the first application layer. Verfahren nach einem der Ansprüche 1 bis 6, gekennzeichnet durch die Anwendung bei der Herstellung von beschichtetem Karton.Method according to one of claims 1 to 6, characterized by the use in the production of coated cardboard. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der erste Auftrag durch eine Streichklinge oder eine geeignete Leiste anstelle der Rollrakel dosiert wird.A method according to claim 1, characterized in that the first application is metered by a doctor blade or a suitable bar instead of the doctor blade. Einrichtung zur Durchführung des Verfahrens, dadurch gekennzeichnet, daß als Auftragswerk jeweils eine Düsenkammer (6, 9) vorgesehen ist, an deren austrittsseitigem Ende in der Nähe der zu beschichtenden Oberfläche eine Rollrakel (7, 11) mit deren Halter (8, 12) angeordnet ist.Device for carrying out the method, characterized in that a nozzle chamber (6, 9) is provided as the application unit, at the outlet end of which a roller doctor blade (7, 11) with its holder (8, 12) is arranged in the vicinity of the surface to be coated is. Einrichtung nach Anspruch 9, dadurch gekennzeichnet, daß zumindest die erste Bahnführungswalze (1) mit einer Schicht aus Gummi oder ähnlichem beschichtet ist, die eine Härte zwischen 0 und 200 P u.J, vorzugsweise zwischen 10 und 70 P u.J aufweist.Device according to claim 9, characterized in that at least the first web guide roller (1) is coated with a layer of rubber or the like which has a hardness between 0 and 200 P uJ, preferably between 10 and 70 P uJ. Einrichtung nach Anspruch 9 oder 10, dadurch gekennzeichnet, daß das zum Auftragen der zweiten Schicht dienende, zweite Auftragswerk an der der ersten Bahnführungswalze (21) zugeordneten, zweiten Bahnführungswalze (Preßwalze 22) vorgesehen ist.Device according to claim 9 or 10, characterized in that the second application unit used to apply the second layer is provided on the second web guide roller (press roller 22) associated with the first web guide roller (21).
EP90124884A 1990-01-26 1990-12-20 Coating process and apparatus for coating a moving web of paper or paperboard Revoked EP0438743B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90124884T ATE95585T1 (en) 1990-01-26 1990-12-20 COATING PROCESS AND APPLICATION EQUIPMENT FOR COATING RUNNING WEBS OF PAPER OR CARDBOARD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002256A DE4002256A1 (en) 1990-01-26 1990-01-26 Cardboard web coating - has grooved roller spreader and web guide roller to give thin in layer of coating mass
DE4002256 1990-01-26

Publications (2)

Publication Number Publication Date
EP0438743A1 true EP0438743A1 (en) 1991-07-31
EP0438743B1 EP0438743B1 (en) 1993-10-06

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EP90124884A Revoked EP0438743B1 (en) 1990-01-26 1990-12-20 Coating process and apparatus for coating a moving web of paper or paperboard

Country Status (9)

Country Link
EP (1) EP0438743B1 (en)
JP (1) JPH04313360A (en)
AT (1) ATE95585T1 (en)
BR (1) BR9006678A (en)
CA (1) CA2035061A1 (en)
DE (2) DE4002256A1 (en)
ES (1) ES2044390T3 (en)
FI (1) FI905757A (en)
NO (1) NO176676C (en)

Cited By (8)

* Cited by examiner, † Cited by third party
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EP0571351A1 (en) * 1992-05-21 1993-11-24 Valmet Paper Machinery Inc. Coating device for the coating of a size-press roll, paper, or board
WO1994023127A1 (en) * 1993-04-06 1994-10-13 Veitsiluoto Oy A method of coating paper and an apparatus therefor
EP0731213A2 (en) * 1995-03-09 1996-09-11 DRAISWERKE GmbH Process and plant for the treatment of coating colour during the application to a paper web
EP0791687A1 (en) * 1996-02-21 1997-08-27 Voith Sulzer Papiermaschinen GmbH Process and device for coating a liquid or pasty material onto a moving web
EP0812957A1 (en) * 1996-06-13 1997-12-17 Voith Sulzer Papiermaschinen GmbH Process and device for coating of a running material web
EP0812958A1 (en) * 1996-06-13 1997-12-17 Voith Sulzer Papiermaschinen GmbH Device for the application of two layers, in successive order, of liquid or pasty media on one side of a running material web
WO1998020202A1 (en) * 1996-11-04 1998-05-14 Valmet Corporation Method and arrangement for coating a moving paperboard web
EP0965684A2 (en) * 1998-06-17 1999-12-22 Voith Sulzer Papiertechnik Patent GmbH Device for applying fluid or pasty material onto a moving web

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DE4211401A1 (en) * 1992-04-04 1993-10-07 Voith Gmbh J M Coating device for webs of paper or cardboard
DE4224717B9 (en) * 1992-07-27 2004-08-19 Mitsubishi Hitec Paper Bielefeld Gmbh Process for producing a pressure sensitive recording sheet
FI93665C (en) * 1992-11-13 1995-05-10 Valmet Paper Machinery Inc Method and apparatus for coating a paper web
DE4414949A1 (en) * 1994-04-28 1995-11-02 Voith Gmbh J M Device for applying at least one liquid medium to a running web of material
DE19958109A1 (en) * 1999-12-02 2001-06-07 Voith Paper Patent Gmbh Assembly for the indirect coating of a moving paper/cardboard web has structured peripheral positions and peripheral angles around the transfer roller for an effective and consistent surface coating action
DE10126365A1 (en) * 2001-05-30 2002-12-05 Voith Paper Patent Gmbh To coat a moving paper/cardboard web on both sides, a coating is applied indirectly to one side to give a shallow penetration depth, and coated indirectly on the other side with a greater penetration depth
PL422374A1 (en) * 2017-07-27 2019-01-28 Kartonex Spółka Z Ograniczoną Odpowiedzialnością Method for impregnation of corrugated board and the set of devices for impregnation of corrugated board

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0571351A1 (en) * 1992-05-21 1993-11-24 Valmet Paper Machinery Inc. Coating device for the coating of a size-press roll, paper, or board
WO1994023127A1 (en) * 1993-04-06 1994-10-13 Veitsiluoto Oy A method of coating paper and an apparatus therefor
EP0731213A2 (en) * 1995-03-09 1996-09-11 DRAISWERKE GmbH Process and plant for the treatment of coating colour during the application to a paper web
EP0731213A3 (en) * 1995-03-09 1996-10-16 Draiswerke Gmbh
EP0791687A1 (en) * 1996-02-21 1997-08-27 Voith Sulzer Papiermaschinen GmbH Process and device for coating a liquid or pasty material onto a moving web
EP0812957A1 (en) * 1996-06-13 1997-12-17 Voith Sulzer Papiermaschinen GmbH Process and device for coating of a running material web
EP0812958A1 (en) * 1996-06-13 1997-12-17 Voith Sulzer Papiermaschinen GmbH Device for the application of two layers, in successive order, of liquid or pasty media on one side of a running material web
WO1998020202A1 (en) * 1996-11-04 1998-05-14 Valmet Corporation Method and arrangement for coating a moving paperboard web
US6217940B1 (en) 1996-11-04 2001-04-17 Valmet Corporation Method and apparatus for coating a moving paperboard web
EP0965684A2 (en) * 1998-06-17 1999-12-22 Voith Sulzer Papiertechnik Patent GmbH Device for applying fluid or pasty material onto a moving web
EP0965684A3 (en) * 1998-06-17 2000-07-05 Voith Sulzer Papiertechnik Patent GmbH Device for applying fluid or pasty material onto a moving web

Also Published As

Publication number Publication date
EP0438743B1 (en) 1993-10-06
FI905757A0 (en) 1990-11-21
FI905757A (en) 1991-07-27
DE4002256A1 (en) 1991-08-01
NO904827L (en) 1991-07-29
JPH04313360A (en) 1992-11-05
ATE95585T1 (en) 1993-10-15
NO176676B (en) 1995-01-30
NO904827D0 (en) 1990-11-06
NO176676C (en) 1995-05-10
BR9006678A (en) 1991-10-01
CA2035061A1 (en) 1991-07-27
ES2044390T3 (en) 1994-01-01
DE59003011D1 (en) 1993-11-11

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