EP0352582A2 - Application device for coating moving webs, and coating process - Google Patents

Application device for coating moving webs, and coating process Download PDF

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Publication number
EP0352582A2
EP0352582A2 EP89113032A EP89113032A EP0352582A2 EP 0352582 A2 EP0352582 A2 EP 0352582A2 EP 89113032 A EP89113032 A EP 89113032A EP 89113032 A EP89113032 A EP 89113032A EP 0352582 A2 EP0352582 A2 EP 0352582A2
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EP
European Patent Office
Prior art keywords
roller
coating
doctor blade
circumferential grooves
web
Prior art date
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Granted
Application number
EP89113032A
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German (de)
French (fr)
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EP0352582B1 (en
EP0352582B2 (en
EP0352582A3 (en
Inventor
Hans-Peter Dr. Sollinger
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JM Voith GmbH
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JM Voith GmbH
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Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT89113032T priority Critical patent/ATE87677T1/en
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Classifications

    • 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
    • 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
    • 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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
    • D21H23/56—Rolls
    • D21H23/58—Details thereof, e.g. surface characteristics, peripheral speed
    • D21H23/60—Details thereof, e.g. surface characteristics, peripheral speed the material on the applicator roll being subjected to a particular treatment before applying to the 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
    • 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

Definitions

  • the invention relates to an application device according to the preamble of claim 1 and corresponding method.
  • the method for coating running material webs with the 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.
  • One of the latter corresponding devices is also known from CA 882 640.
  • the latter differs from the other in that the application takes place in the first coating station by means of an application roller.
  • This first applied layer is then evened out by means of a doctor blade, the excess being scraped off. In the other device, scraping by means of a doctor blade also takes place in the first coating station.
  • the object of the invention is to provide a reliable wet-on-wet coating method with the best coating quality and economical material consumption.
  • a new coating device is created according to the characterizing part of patent claim 1.
  • the coating is first applied to the web to a small extent, with the first nip of coating being uniformly pressed in by the press nip between the first web guide roller and the press roller.
  • the web is virtually impregnated, and it is easily possible to evenly apply the cover layer with the second coating device.
  • Due to the press nip there is no great stress, in particular tensile or crushing stress on the material web.
  • the scraper blade which tends to compress the web or even cause web breaks, is easily avoided at the stage where web contacts can occur.
  • the first web guide roller that is, the first coating device with 1, the associated press roller with 2 and the web guide roller of the second coating device with 3.
  • the path is indicated by W.
  • the first coating device has an application chamber 4 for the coating material, into which it is introduced through the feed pipe 5.
  • the application chamber is designed as a nozzle chamber with an overflow so that excess coating compound can overflow into the collecting trough 7, which is attached to the application chamber 4.
  • the application chamber 4 is held by a support beam 6.
  • a doctor blade 8 At the end of the application chamber 4 on the exit side in the direction of rotation of the web guide roller 1 there is the metering element, a doctor blade 8, which is in front preferably has a surface provided with circumferential grooves.
  • Such an application chamber 13 with feed pipe 14 is also provided as the second coating device.
  • a doctor blade 12 is provided here on the outlet side with respect to the application chamber 13, which smoothes the second application layer.
  • the relatively precisely metered amount of coating composition is pressed into the web, preferably a paper or cardboard web, and impregnated therewith.
  • the web W is then fed to the second coating device without further drying. It can be passed over an spreader roller 18 to avoid wrinkles.
  • the doctor blade 12 is of course pressed in a known manner by the pressing means so that it lies evenly on the web guide roller 3 or the monitor web and smoothes the coating very evenly.
  • the orders with order chamber are known e.g. from US 4,250,211 and application squeegee with sump and roller squeegee including holder from US 2,970,564.
  • a squeegee provided with wire wrapping forming the circumferential grooves is e.g. known from US 3,387,585.
  • a variant is shown in broken lines in FIG. 1, in which the web guide rollers 1 and 3 are arranged directly next to one another. In the gap that is formed between the two rollers, the web runs relatively smoothly, at least without major contact forces.
  • a pressure in the nip between roller 1 and 3 is not possible, since web elongation and transverse expansion between the nip of roller 1 and 3 and the blade 12 cannot be compensated for.
  • the basic principle of the application device according to the invention is to carry out the first coating only to such an extent that essentially only the paper is impregnated. Therefore, the amount of the coating slip applied in the first application device depends on the absorbency of the paper, which among other things. is essentially a function of the basis weight of the paper. For example, basis weights of more than 80 g / m2 are used for wood-free paper types. With these papers, which are also equipped with greater absorbency because of their greater porosity, the basis weight applied in the first coating device is a maximum of about 7 g / m 2, so that a total of 15 g / m 2 coating amount is applied in both coating devices.
  • the corresponding groove size is a maximum of about 0.012 mm / m2 in cross section. This applies essentially to those squeegees with wire wrapping. However, these squeegees do not have a very long service life.
  • doctor blades have been developed for the application device according to the invention, which make it possible to produce a perfect line over longer operating periods.
  • Such a doctor blade is sketched in FIG. 2, with webs 21 being located between the grooves 20 which, viewed in cross section parallel to the central axis of the doctor blade rod, have a surface parallel to this central axis.
  • the value per meter working width of the roller doctor rod of a maximum of 34 mm2 can be regarded as the upper limit.
  • the cross section of the grooves of a roller doctor rod provided with wire wrapping is a maximum of approximately 0.006 mm 2 in order to apply an application layer of 3 g / m 2 by means of the first coating device.
  • the total order is then about 10 g / m2.
  • the total cross-sectional area for the doctor blade according to FIG. 2 is then a maximum of 24 mm2 per meter of working width.

Landscapes

  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paper (AREA)
  • Photoreceptors In Electrophotography (AREA)

Abstract

The coating device features a first applicator which, to begin with, forces coating substance applied on the shell of a web roll (1), in a press gap formed between said roll and a press roll (2), into the web (W), thereby impregnating it. This makes it possible to apply with maximum uniformity and without web breaks and wrinkles, immediately successively, a second coating layer during the still wet condition of the first layer where, naturally, again a web guide roll (3) is provided.

Description

Die Erfindung betrifft eine Auftragseinrichtung entsprechend dem Oberbegriff des Patentanspruchs 1 sowie entsprechendes Verfahren. Das Verfahren zur Beschichtung laufender Warenbahnen mit den zwei aufeinander folgenden Beschichtungsvorgängen, wo­bei die zuerst aufgetragene Schicht noch feucht ist, wenn die zweite Schicht aufgetragen wird, ist bekannt aus US 3,202,536. Die beiden Beschichtungsstationen sind hier sowohl an einer einzigen die Bahn führenden Walze angeordnet als auch an zwei aufeinander folgenden Walzen. Eine der letztgenannten entspre­chende Einrichtung ist auch bekannt aus CA 882 640. Die letzt­genannte unterscheidet sich von der anderen dadurch, daß in der ersten Beschichtungsstation der Auftrag mittels Auftragswalze erfolgt. Diese zuerst aufgetragene Schicht wird dann mittels Streichklinge vergleichmäßigt, wobei der Überschuß abgeschabt wird. Bei der anderen Einrichtung erfolgt in der ersten Be­schichtungsstation ebenfalls ein Abschaben mittels einer Scha­berklinge.The invention relates to an application device according to the preamble of claim 1 and corresponding method. The method for coating running material webs with the 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. One of the latter corresponding devices is also known from CA 882 640. The latter differs from the other in that the application takes place in the first coating station by means of an application roller. This first applied layer is then evened out by means of a doctor blade, the excess being scraped off. In the other device, scraping by means of a doctor blade also takes place in the first coating station.

Die Aufgabe der Erfindung ist ein betriebssicheres Naß- in Naß-Streichverfahren mit bester Strichqualität und sparsamem Materialverbrauch zu schaffen.The object of the invention is to provide a reliable wet-on-wet coating method with the best coating quality and economical material consumption.

Gemäß der Erfindung wird eine neue Beschichtungseinrichtung ge­mäß dem Kennzeichen des Patentanspruchs 1 geschaffen. Hierbei ist als Vorteil zu nennen, daß die Beschichtung zunächst in ge­ringem Maße auf die Warenbahn aufgetragen wird, wobei durch den Preßspalt zwischen der ersten Bahnführungswalze und der Preß­walze ein gleichmäßiges Einpressen der ersten Beschichtungs­menge erfolgt. Dadurch wird die Bahn quasi imprägniert, und es ist ohne weiteres möglich, gleichmäßig die Deckschicht mit der zweiten Beschichtungseinrichtung zufzutragen. Durch den Preßnip tritt keine große Beanspruchung, insbesondere Zug- oder Quetschbeanspruchung der Warenbahn auf. Die leicht in dem Sta­dium, wo es zu Bahnberührungen kommen kann, zum Verpressen der Bahn neigende oder sogar Bahnrisse herbeiführende Schaberklinge ist dort vermieden. Sehr vorteilhaft ist es, zwecks gleichmäßi­gem Auftrag einer dosierten Menge eine Rollrakel zu verwenden, deren Umfang mit Rillen versehen ist. Diese Rillen können sehr fein ausgebildet sein, so daß sich ein besonders gleichmäßiger Auftrag ergibt.According to the invention, a new coating device is created according to the characterizing part of patent claim 1. Here it is to be mentioned as an advantage that the coating is first applied to the web to a small extent, with the first nip of coating being uniformly pressed in by the press nip between the first web guide roller and the press roller. As a result, the web is virtually impregnated, and it is easily possible to evenly apply the cover layer with the second coating device. Due to the press nip, there is no great stress, in particular tensile or crushing stress on the material web. The scraper blade, which tends to compress the web or even cause web breaks, is easily avoided at the stage where web contacts can occur. It is very advantageous to use a doctor blade for the uniform application of a metered quantity, the circumference of which is provided with grooves. These grooves can be very fine, so that there is a particularly uniform application.

Nachfolgend wird die Erfindung anhand dreier in den Figuren der Zeichnung dargestellter Beispiele erläutert.The invention is explained below using three examples shown in the figures of the drawing.

In Figur 1 ist die erste Bahnführungswalze, also die der ersten Beschichtungseinrichtung mit 1, die zugehörige Preßwalze mit 2 und die Bahnführungswalze der zweiten Beschichtungseinrichtung mit 3 bezeichnet. Die Bahnführung ist mit W angegeben. Die erste Beschichtungseinrichtung weist eine Auftragskammer 4 für die Beschichtungsmasse auf, in welche diese durch das Zuführrohr 5 eingeleitet wird. Die Auftragskammer ist als Düsenkammer mit einem Überlauf ausgebildet, so daß überschüssige Beschichtungs­masse in die Auffangwanne 7, die an der Auftragskammer 4 be­festigt ist, überfließen kann. Die Auftragskammer 4 wird von einem Tragbalken 6 gehalten. Am in Drehrichtung der Bahn­führungswalze 1 austrittsseiten Ende der Auftragskammer 4 befindet sich das Dosierelement, eine Rollrakel 8, die vor­ zugsweise eine mit Umfangsrillen versehene Oberfläche aufweist. Als zweite Beschichtungseinrichtung ist ebenfalls eine derarti­ge Auftragskammer 13 mit Zuführrohr 14 vorgesehen. Es ist eben­falls eine Auffangrinne 16 und ein Tragbalken 15 vorhanden. Anstelle der Rollrakel 8 ist hier aber eine Streichklinge 12 austrittsseitig in bezug auf die Auftragskammer 13 vorgesehen, die die zweite Auftragsschicht glättet. In dem zwischen der Bahnführungswalze 1 und der Preßwalze 2 gebildeten Preßspalt wird die in relativ genau dosierter Menge an Beschichtungsmasse in die Warenbahn, vorzugsweise eine Papier- oder Kartonbahn hineingepreßt und diese damit imprägniert. Ohne weitere Trock­nung wird dann die Warenbahn W der zweiten Beschichtungsein­richtung zugeführt. Dabei kann sie über eine Breitstreckwalze 18 geleitet werden, um Faltenbildungen zu vermeiden.In Figure 1, the first web guide roller, that is, the first coating device with 1, the associated press roller with 2 and the web guide roller of the second coating device with 3. The path is indicated by W. The first coating device has an application chamber 4 for the coating material, into which it is introduced through the feed pipe 5. The application chamber is designed as a nozzle chamber with an overflow so that excess coating compound can overflow into the collecting trough 7, which is attached to the application chamber 4. The application chamber 4 is held by a support beam 6. At the end of the application chamber 4 on the exit side in the direction of rotation of the web guide roller 1 there is the metering element, a doctor blade 8, which is in front preferably has a surface provided with circumferential grooves. Such an application chamber 13 with feed pipe 14 is also provided as the second coating device. There is also a gutter 16 and a support beam 15. Instead of the doctor blade 8, a doctor blade 12 is provided here on the outlet side with respect to the application chamber 13, which smoothes the second application layer. In the press nip formed between the web guide roller 1 and the press roller 2, the relatively precisely metered amount of coating composition is pressed into the web, preferably a paper or cardboard web, and impregnated therewith. The web W is then fed to the second coating device without further drying. It can be passed over an spreader roller 18 to avoid wrinkles.

Die Streichklinge 12 wird natürlich in jedem Fall in bekannter Weise durch die Anpreßmittel so angedrückt, daß sie gleichmäßig an der Bahnführungswalze 3 bzw. der Waranbahn anliegt und die Beschichtung sehr gleichmäßig glättet.The doctor blade 12 is of course pressed in a known manner by the pressing means so that it lies evenly on the web guide roller 3 or the monitor web and smoothes the coating very evenly.

Die Auftragswerke mit Auftragskammer sind bekannt z.B. aus US 4,250,211 und Auftragsrakel mit Sumpf und Rollrakel ein­schließlich Halter aus US 2,970,564. Eine Rollrakel, die mit die Umfangsrillen bildender Drahtumwicklung versehen ist, ist z.B. bekannt aus US 3,387,585.The orders with order chamber are known e.g. from US 4,250,211 and application squeegee with sump and roller squeegee including holder from US 2,970,564. A squeegee provided with wire wrapping forming the circumferential grooves is e.g. known from US 3,387,585.

Man kann durch eine zwischen den beiden Bahnführungswalzen 1 und 3 eingeschaltete Breitstreckwalze 18 den Bahnverlauf und die Bahnbeanspruchung durch Bahnzug noch wesentlich vergleich­mäßigen.By means of an spreader roller 18 switched on between the two web guide rollers 1 and 3, the web course and the web stress caused by the web tension can be substantially evened out.

In Figur 1 ist gestrichelt eine Variante dargestellt, bei wel­cher die Bahnführungswalzen 1 und 3 unmittelbar nebeneinander angeordnet sind. In dem Spalt, der zwischen den beiden Walzen gebildet ist, verläuft die Bahn relativ reibungsfrei, jeden­falls ohne größere Anpreßkräfte.A variant is shown in broken lines in FIG. 1, in which the web guide rollers 1 and 3 are arranged directly next to one another. In the gap that is formed between the two rollers, the web runs relatively smoothly, at least without major contact forces.

Eine Anpressung im Nip zwischen Walze 1 und 3 ist nicht mög­lich, da Bahnlängung und Querdehnung zwischen dem Nip von Walze 1 und 3 und der Klinge 12 nicht ausgeglichen werden können.A pressure in the nip between roller 1 and 3 is not possible, since web elongation and transverse expansion between the nip of roller 1 and 3 and the blade 12 cannot be compensated for.

Das Grundprinzip der erfindungsgemäßen Auftragseinrichtung ist es, die erste Beschichtung nur in einem solchen Maße vorzuneh­men, daß im wesentlichen nur eine Imprägnierung des Papiers er­folgt. Daher hängt die Menge der in der ersten Auftragseinrich­tung aufgetragenen Streichmasse von der Saugfähigkeit des Pa­piers ab, welche u.a. im wesentlichen eine Funktion des Flächengewichts des Papiers ist. So werden z.B. für holzfreie Papiersorten Flächengewichte von mehr als 80 g/m² verwendet. Bei diesen wegen ihrer größeren Porosität auch mit größerer Saugfähigkeit ausgestatteten Papieren beträgt das in der ersten Beschichtungseinrichtung aufgetragene Flächengewicht maximal etwa 7 g/m², so daß insgesamt eine Schichtungsmenge von 15 g/m² in beiden Beschichtungseinrichtungen aufgetragen wird. Die ent­sprechende Rillengröße beträgt dabei im Querschnitt maximal et­wa 0,012 mm/m². Dies gilt im wesentlichen für solche Rollrakel, die mit Drahtumwicklung versehen sind. Diese Rollrakel haben aber keine sehr große Standzeit.The basic principle of the application device according to the invention is to carry out the first coating only to such an extent that essentially only the paper is impregnated. Therefore, the amount of the coating slip applied in the first application device depends on the absorbency of the paper, which among other things. is essentially a function of the basis weight of the paper. For example, basis weights of more than 80 g / m² are used for wood-free paper types. With these papers, which are also equipped with greater absorbency because of their greater porosity, the basis weight applied in the first coating device is a maximum of about 7 g / m 2, so that a total of 15 g / m 2 coating amount is applied in both coating devices. The corresponding groove size is a maximum of about 0.012 mm / m² in cross section. This applies essentially to those squeegees with wire wrapping. However, these squeegees do not have a very long service life.

Daher sind Rollrakelstäbe für die erfindungsgemäße Auftragsein­richtung entwickelt worden, die es ermöglichen, ein einwand­freien Strich über längere Betriebszeiträume herzustellen. Eine solche Rollrakel ist in Figur 2 skizziert, wobei zwischen den Rillen 20 sich Stege 21 befinden, die im Querschnitt parallel zur Mittelachse des Rollrakelstabes gesehen, eine zu dieser Mittelachse parallele Oberfläche aufweisen.Therefore, doctor blades have been developed for the application device according to the invention, which make it possible to produce a perfect line over longer operating periods. Such a doctor blade is sketched in FIG. 2, with webs 21 being located between the grooves 20 which, viewed in cross section parallel to the central axis of the doctor blade rod, have a surface parallel to this central axis.

Für den Querschnitt dieser Rillen kann etwa der Wert je Meter Arbeitsbreite des Rollrakelstabes von maximal 34 mm² als obere Grenze angesehen werden.For the cross-section of these grooves, the value per meter working width of the roller doctor rod of a maximum of 34 mm² can be regarded as the upper limit.

Bei Papieren minderwertigerer Qualität, also mit einem Flächen­gewicht von weniger als 80 g/m² beträgt der Querschnitt der Rillen eines mit Drahtumwicklung versehenen Rollrakelstabes maximal etwa 0,006 mm², um eine Auftragsschicht von 3 g/m² mit­tels der ersten Beschichtungseinrichtung aufzutragen. Der Ge­samtauftrag beträgt dann etwa 10 g/m².In the case of papers of inferior quality, that is to say with a weight per unit area of less than 80 g / m 2, the cross section of the grooves of a roller doctor rod provided with wire wrapping is a maximum of approximately 0.006 mm 2 in order to apply an application layer of 3 g / m 2 by means of the first coating device. The total order is then about 10 g / m².

Die Gesamtquerschnittsfläche für Rollrakel nach Figur 2 beträgt dann je Meter Arbeitsbreite maximal 24 mm².The total cross-sectional area for the doctor blade according to FIG. 2 is then a maximum of 24 mm² per meter of working width.

Auf diese Weise wird mittels der ersten Beschichtungs­einrichtung eine so dünne Schicht aufgetragen, daß mittels der Preßwalze 2 praktisch eine Imprägnierung dieser dünnen Auf­tragsschicht des Papiers erfolgt. Dann kann ohne weiteres mit der zweiten Beschichtungseinrichtung, die an der zweiten Walze 3 angeordnet ist, der vollständige, endgültige Schichtauftrag erfolgen. Es hat sich gezeigt, daß auf diese Weise eine sehr hohe Strichqualität erreichbar ist.In this way, a layer so thin is applied by means of the first coating device that the thin application layer of the paper is practically impregnated by means of the press roller 2. Then the complete, final layer application can easily be carried out with the second coating device, which is arranged on the second roller 3. It has been shown that a very high stroke quality can be achieved in this way.

Es hat sich somit gezeigt, daß die erfindungsgemäße Einrichtung sehr viel effektiver arbeitet, als die eingangs genannte gemäß US-PS 32 02 536. Der Gedanke bei jener Einrichtung war es, eine sehr hohe Konsistenz der ersten Beschichtung zu verwenden, da­mit die Eindringtiefe des Lösungsmittels nicht so groß ist. Der Nachteil bei jener Einrichtung war aber, daß die erste Be­sichichtung doch relativ dick aufgetragen wurde, wobei es schwierig ist, diese erste Schicht mit einer Streichklinge ge­nügend zu glätten. Erfindungsgemäß erfolgt auch das Auftragen beider Beschichtungen mittels eines Auftragswerkes, das eine unter Druck stehende Auftragskammer aufweist. Auch diese scheint für ein sehr gutes Streichergebnis beizutragen. Die Anordnung gemäß der CA-PS 882 640 scheint noch schlechter im Ergebnis zu sein als die Anordung gemäß der genannten US-Patentschrift.It has thus been shown that the device according to the invention works much more effectively than the above-mentioned according to US-PS 32 02 536. The idea with that device was to use a very high consistency of the first coating, so that the penetration depth of the solvent is not that big. The disadvantage with this device was, however, that the first coating was applied relatively thickly, and it is difficult to smooth this first layer sufficiently with a doctor blade. According to the invention, both coatings are also applied by means of an application unit which has an application chamber which is under pressure. This also seems to contribute to a very good streak result. The arrangement according to CA-PS 882 640 appears to be even worse in result than the arrangement according to the mentioned US patent.

Bei der Anordnung gemäß Figur 3 ist eine andere Auftragsein­richtung der Bahnführungswalze 1 zugeordnet, an welcher ein zu­sammen mit dem Tragbalken 9 den Sumpf aus Beschichtungsmasse bildender Halter 11 für die Rollrakel 10 vorgesehen ist. Da es sich um einen offenen Sumpf handelt, ist hier die nötige Pum­penleistung geringer als im Fall von Figur 1.In the arrangement according to FIG. 3, another application device is assigned to the web guide roller 1, on which a holder 11 for the doctor blade 10, which forms the sump of coating material, is provided together with the support beam 9. Since it is an open sump, the pump output required is lower than in the case of FIG. 1.

Claims (5)

1. Verfahren zur Beschichtug laufender Warenbahnen, insbeson­dere aus Papier oder Karton, wobei unmittelbar nacheinander zwei Schichten aufeinander gelegt 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 die zweite Beschichtungseinrichtung eine Glättschaber auf­weist, dadurch gekennzeichnet, daß von der ersten Beschich­tungseinrichtung zurerst die Beschichtungsmasse für die erste Schicht in dosierter Menge auf den Mantel der ersten Walze aufgetragen wird und dann die aufgetragene Menge durch eine einen Preßspalt mit der ersten Walze (1) bilden­der Preßwalze (2) zur Erzielung einer Imprägnierung der Pa­pier- oder Kartonbahn in dieselbe eingepreßt wird, wobei das Flächengewicht dieser ersten Schicht maximal 7 g/m² be­trägt, und wobei die aufgetragene Menge derart bemessen wird, daß sie maximal der Aufsaugkapazität des Papieres entspricht.1. A method for coating running webs of material, in particular made of paper or cardboard, two layers being laid one after the other immediately while the first layer is still moist and at least one rotatable roller guiding the web is provided for both the first and the second coating process and the second coating device has a smoothing scraper, characterized in that the coating composition for the first layer is first applied in a metered amount to the jacket of the first roller by the first coating device and then the applied amount is passed through a press nip with the first roller (1) forming press roller (2) is pressed to achieve an impregnation of the paper or cardboard web, the basis weight of this first layer is a maximum of 7 g / m², and the amount applied is such that it is at most the absorbent capacity of the papi it corresponds. 2. Einrichtung zur Durchführung des Verfahrens, dadurch ge­kennzeichnet, daß die erste Beschichtungseinrichtung einen Preßspalt aufweist, gebildet aus der ersten (1) und einer weiteren Walze (2), daß der ersten Walze (1) ein Auftrags­werk (4) zugeordnet ist, vorzugsweise ein Düsenauftrags­werk, mit einer Rollrakel (8), die mit Umfangsrillen ver­sehen und am ablaufenden Ende des Dü- senauftragswerks (4) als Dosierelement angeordnet ist, und daß die Umfangsrillen in einem Axialschnitt durch die Rakel (8) gesehen einen Querschnitt pro Rille von höchstens 0,012 mm² aufweisen, wobei die die Streichmasse enthaltende Kammer des Auftrags­werks an der Walze (1) durch die Rollrakel (8) bzw. deren Halter (11) begrenzt ist.2. Device for performing the method, characterized in that the first coating device has a press nip, formed from the first (1) and a further roller (2), that the first roller (1) is assigned an application unit (4), preferably a nozzle applicator, with a doctor blade (8), which is provided with circumferential grooves and is arranged at the end of the nozzle applicator (4) as a metering element, and that the circumferential grooves, seen in an axial section through the doctor blade (8), have a maximum cross-section per groove 0.012 mm², the chamber of the coating unit containing the coating slip on the roller (1) being delimited by the doctor blade (8) or its holder (11). 3. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Umfangsrillen je einen Querschnitt von höchstens 0,012 mm² bei Papieren mit einem Flächengewicht von mehr als 80 g/m² und höchstens von 0,006 mm² bei Papieren mit einem Flächengewicht von höchstens 80 g/m² haben.3. Device according to claim 2, characterized in that the circumferential grooves each have a cross section of at most 0.012 mm² for papers with a basis weight of more than 80 g / m² and at most 0.006 mm² for papers with a basis weight of at most 80 g / m². 4. Einrichtung zur Durchführung des Verfahrens, dadurch ge­kennzeichnet, daß die erste Beschichtungseinrichtung einen Preßspalt aufweist, gebildet aus der ersten (1) und einer weiteren Walze (2), daß der ersten Walze (1) ein Düsenauf­tragswerk (4) zugeordnet ist, mit einer Rollrakel (8), die mit Umfangsrillen versehen und am ablaufenden Ende des Dü­senauftragswerks (4) als Dosierelement angeordnet ist, und daß die Umfangsrillen in einem Axialschnitt durch die Rakel (8) gesehen einen Querschnitt insgesamt pro Meter Arbeits­breite der Rollrakel (8) von höchstens 34 mm² aufweisen.4. Device for performing the method, characterized in that the first coating device has a press nip, formed from the first (1) and a further roller (2), that the first roller (1) is assigned a nozzle applicator (4) with a roller doctor (8), which is provided with circumferential grooves and is arranged at the outgoing end of the nozzle applicator (4) as a metering element, and that the circumferential grooves seen in an axial section through the doctor (8) have a total cross section per meter of working width of the doctor blade (8) have a maximum of 34 mm². 5. Einrichtung nach einem der Ansprüche 1 bis 4, dadurch ge­kennzeichnet, daß die Rollrakel mit Umfangsrillen (20) ver­sehen ist, die durch Stege (21) mit im wesentlichen in Mit­telachsrichtung des Rollrakelstabes (8) gesehen zu dieser paralleler Oberfläche voneinander getrennt sind, wobei die Breite der Stege in dieser Mittelachsrichtung gesehen höch­stens gleich der maximalen Breite des Querschnitts der Um­fangsrillen (20) beträgt.5. Device according to one of claims 1 to 4, characterized in that the roller doctor blade is provided with circumferential grooves (20) which are separated from one another by webs (21) with a substantially in the central axis direction of the roller doctor blade rod (8) to this parallel surface, wherein the width of the webs seen in this central axis direction is at most equal to the maximum width of the cross section of the circumferential grooves (20).
EP89113032A 1988-07-27 1989-07-15 Process for coating running webs of paper or board Expired - Lifetime EP0352582B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89113032T ATE87677T1 (en) 1988-07-27 1989-07-15 APPLICATION EQUIPMENT FOR COATING RUNNING WEBS AND COATING PROCESSES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3825412 1988-07-27
DE3825412 1988-07-27

Publications (4)

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EP0352582A2 true EP0352582A2 (en) 1990-01-31
EP0352582A3 EP0352582A3 (en) 1991-06-12
EP0352582B1 EP0352582B1 (en) 1993-03-31
EP0352582B2 EP0352582B2 (en) 1999-02-24

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EP19890110962 Withdrawn EP0352465A3 (en) 1988-07-27 1989-06-16 Application device for coating moving webs, and coating process
EP89113032A Expired - Lifetime EP0352582B2 (en) 1988-07-27 1989-07-15 Process for coating running webs of paper or board

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EP19890110962 Withdrawn EP0352465A3 (en) 1988-07-27 1989-06-16 Application device for coating moving webs, and coating process

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US (3) US4980207A (en)
EP (2) EP0352465A3 (en)
JP (1) JP2524641B2 (en)
AT (1) ATE87677T1 (en)
CA (1) CA1336374C (en)
DE (2) DE3922535C3 (en)
ES (1) ES2039766T3 (en)
FI (1) FI94274C (en)
NO (1) NO176008C (en)

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EP0458035A2 (en) * 1990-05-08 1991-11-27 J.M. Voith GmbH Device for applying a liquid coating product on sheet-like materials
EP0438743B1 (en) * 1990-01-26 1993-10-06 J.M. Voith GmbH Coating process and apparatus for coating a moving web of paper or paperboard
WO1994023127A1 (en) * 1993-04-06 1994-10-13 Veitsiluoto Oy A method of coating paper and an apparatus therefor
US5650200A (en) * 1994-06-29 1997-07-22 Valmet Corporation Method and apparatus for controlling the thickness of a coating applied to a moving web
AT407014B (en) * 1991-06-19 2000-11-27 Voith Gmbh J M STROKE BLADE
US7264440B2 (en) 2003-06-06 2007-09-04 Aisan Kogyo Kabushiki Kaisha Fuel pump

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EP0352465A3 (en) * 1988-07-27 1990-10-10 J.M. Voith GmbH Application device for coating moving webs, and coating process
US5340611A (en) * 1989-07-25 1994-08-23 J. M. Voith Gmbh Process for coating travelling webs
FI86318C (en) * 1990-06-26 1992-08-10 Keskuslaboratorio Method and apparatus for regulating leaf coating
DE4211401A1 (en) * 1992-04-04 1993-10-07 Voith Gmbh J M Coating device for webs of paper or cardboard
FI93665C (en) * 1992-11-13 1995-05-10 Valmet Paper Machinery Inc Method and apparatus for coating a paper web
DE4340039C2 (en) * 1993-11-24 1997-08-21 Voith Gmbh J M Coating device for running webs of paper or cardboard
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
FI109216B (en) 1996-03-06 2002-06-14 Metso Paper Inc Method and apparatus for coating a running web
DE29610395U1 (en) * 1996-06-13 1996-08-22 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Device for the sequential application of two layers of liquid or pasty media on one side of a running material web
DE19623622A1 (en) * 1996-06-13 1997-12-18 Voith Sulzer Papiermasch Gmbh Method and device for coating a running material web
US5776546A (en) * 1996-06-26 1998-07-07 Miply Equipment, Inc. Method and apparatus for impregnating a porous substrate with a solids-bearing saturant
DE19704858B4 (en) * 1997-02-10 2005-07-21 Voith Paper Gmbh & Co. Kg Method and device for producing double-sided coated paper webs
US5843529A (en) * 1997-02-13 1998-12-01 Beloit Technologies, Inc. Pre-metering rod
FI102200B (en) * 1997-02-24 1998-10-30 Valmet Corp Method for processing paperboard or paper, arrangement for carrying out the method and product obtained by the method
DE19722117C2 (en) * 1997-05-27 2000-09-07 Bematec S A Coating of porous supports
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
US9304415B2 (en) * 2013-04-26 2016-04-05 Hewlett-Packard Development Company, L.P. Coating liquid dispensers
TWI740640B (en) * 2020-09-11 2021-09-21 全利機械股份有限公司 Liquid applying machine for fiber products

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EP0458035A2 (en) * 1990-05-08 1991-11-27 J.M. Voith GmbH Device for applying a liquid coating product on sheet-like materials
EP0458035A3 (en) * 1990-05-08 1993-02-03 J.M. Voith Gmbh Device for applying a liquid coating product on sheet-like materials
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US7264440B2 (en) 2003-06-06 2007-09-04 Aisan Kogyo Kabushiki Kaisha Fuel pump

Also Published As

Publication number Publication date
DE58903929D1 (en) 1993-05-06
EP0352582B1 (en) 1993-03-31
US5171612A (en) 1992-12-15
EP0352582B2 (en) 1999-02-24
NO176008B (en) 1994-10-10
EP0352465A2 (en) 1990-01-31
US5101760A (en) 1992-04-07
EP0352582A3 (en) 1991-06-12
NO893045D0 (en) 1989-07-26
JP2524641B2 (en) 1996-08-14
DE3922535A1 (en) 1990-02-01
ATE87677T1 (en) 1993-04-15
FI893468A (en) 1990-01-28
ES2039766T3 (en) 1993-10-01
DE3922535C3 (en) 1999-03-18
FI893468A0 (en) 1989-07-18
CA1336374C (en) 1995-07-25
DE3922535C2 (en) 1994-07-14
US4980207A (en) 1990-12-25
FI94274B (en) 1995-04-28
FI94274C (en) 1995-08-10
NO893045L (en) 1990-01-29
JPH0283063A (en) 1990-03-23
NO176008C (en) 1995-01-18
EP0352465A3 (en) 1990-10-10

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