EP0670004A1 - Process and device for coating a travelling material web. - Google Patents

Process and device for coating a travelling material web.

Info

Publication number
EP0670004A1
EP0670004A1 EP94923652A EP94923652A EP0670004A1 EP 0670004 A1 EP0670004 A1 EP 0670004A1 EP 94923652 A EP94923652 A EP 94923652A EP 94923652 A EP94923652 A EP 94923652A EP 0670004 A1 EP0670004 A1 EP 0670004A1
Authority
EP
European Patent Office
Prior art keywords
chamber
coating
web
roller
scraper
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
EP94923652A
Other languages
German (de)
French (fr)
Other versions
EP0670004B1 (en
Inventor
Anton Plomer
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.)
Voith Sulzer Papiermaschinen GmbH
Original Assignee
Voith Sulzer Papiermaschinen 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
Application filed by Voith Sulzer Papiermaschinen GmbH filed Critical Voith Sulzer Papiermaschinen GmbH
Publication of EP0670004A1 publication Critical patent/EP0670004A1/en
Application granted granted Critical
Publication of EP0670004B1 publication Critical patent/EP0670004B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B05C1/0813—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 characterised by means for supplying liquid or other fluent material to the roller
    • 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

Definitions

  • the invention relates to a method for coating a running web of material in accordance with the preamble of claim 1 and a coating device in accordance with the preamble of claim 2.
  • Coating devices for paper and cardboard are widely known, z. B. according to GB 21 03 115 A, the transfer of coating material from the roll mantles of two mutually assigned, between them forming a press nip rolls on the web in the press nip.
  • Nozzle applicators or dipping rollers are used as applicators.
  • the application unit uses a doctor blade to smooth and dose the application layer.
  • EP 04 35 904 B1 discloses a method and a device for coating paper, cardboard or a similar substrate which moves continuously along a path.
  • the coating medium is broken down into mist and fed to an application nozzle with an application surface.
  • a vacuum chamber is arranged adjacent to the application area for receiving excess mist.
  • the spray mist generated is applied directly to the substrate (paper web) by a "positive force” (overpressure) by means of the application nozzle.
  • Necessary uniformity of paper types can be applied to the paper web.
  • the object of the invention is to provide a method and an application device or coating device for running webs of goods with very small, extremely thin application layers and nevertheless uniform application quantities, in particular for glue application.
  • the spraying of coating material is common in many areas of technology, but is hardly used for coating running webs of paper or cardboard.
  • the indirect application that is to say that spray mist is applied to a bare roller and removed from the web, achieves an application which is both extremely thin and very uniform, in particular also transversely to the direction of web travel.
  • the equalization takes place according to the invention at the contact point between the web and the roll, where the web takes over the thin liquid film from the roll.
  • the web can rest against the roller under a certain tension, the web being deflected.
  • the web is preferably allowed to run through the press nip formed by two rollers. This enables double-sided orders.
  • the invention makes use of the vacuum (vacuum) chamber known from EP 04 35 904 B1, which is arranged around the spray nozzle.
  • this serves to suction off excess mist from the coating medium.
  • part of the mist can deposit on the inner wall surface.
  • the baffle surface (side wall) is preferably designed or enlarged such that it forms an inner chamber around the spray nozzle. In this chamber there is a certain overpressure due to the spray mist ejected from the spray nozzle.
  • the impact surface (side wall or inner chamber) on the one hand causes the spray to reach the roller better, and on the other hand takes care of relieving the pressure in the vacuum chamber, which, similar to EP 04 35 904 B1, enables coating medium to emerge from the spray nozzle (Spray) cannot escape into the environment from the chamber, ie the gap between the chamber and the counter roller.
  • the air flowing in from the environment retains the spray in the chamber, so that this can be reflected in the invention partly on the baffle and partly on the inner wall of the outer chamber.
  • the deposited coating medium can run off through an outflow.
  • Precipitated mist remaining in the outer or inner chamber is fed to a separator, for example via a suction fan, whereby the separated medium and the medium flowing directly out of the chamber can be fed to a common collecting container for reuse.
  • Fig. 1 A general representation in principle
  • Fig. 2 A detail regarding the coating device according to the invention
  • Fig. 4 The coating device with another variant to the inner chamber.
  • Fig. 1 the web C is guided in a press nip 11 formed between two press rolls 1 and 2 and coated there.
  • Guide rollers 22 and 23 are provided for the correct guidance of the web.
  • the application units for the coating medium are designated here by 10 and 10 'and are arranged essentially below the respectively assigned press roll; they extend essentially over the entire length of the press rolls.
  • FIGS. 2, 3 and 4 where one (10) is shown. It essentially has a spray nozzle 4.
  • this application unit sprays fine, mist-like spray jets of the coating medium onto the outer surface of the press roll (here 1).
  • the spray nozzle 4 is arranged in a chamber 3 which is under negative pressure. In its draining and running-up side against the surface of the associated press roll 1 or 2 (only applicator or press roll 1 shown in FIG. 4), it is sealed with a gap 16 or 16 ', ie the coating medium emerging from the spray nozzle 4 is applied held back at this point and therefore cannot get into the environment.
  • a side wall 7 is arranged at a slight distance from the spray nozzle 4 on the draining side.
  • This side wall 7 acts as an impact surface for part of the excess spray which is sucked into the vacuum chamber 3 via the gap 18 'and from there is fed to a separator (not shown in the drawing) via a trigger 30 (for example a suction fan) can be.
  • a trigger 30 for example a suction fan
  • the refluxing coating medium runs down through a drain 28 and can be combined with the medium separated in the separator and thus be reused.
  • the spray nozzle 4, as shown in FIGS. 2 and 3, is arranged within an inner chamber 5, the chamber 5 being delimited by means of gaps 18 and 19, as seen in the running direction of the roll surface area.
  • This inner chamber 5 is arranged inside the outer chamber 3, which is under vacuum from the atmosphere, which can be, for example, between 50 and 300 MPa.
  • a scraper 6 can be located on the upstream side of the chamber 3 as a seal for the chamber 3. The scraper is held in a holder 12 by means of pressure hose 14, which presses it against the rear wall of the vacuum chamber 3.
  • Another pressure hose 15 is arranged in a holder 13 and presses the scraper against the outer surface of the roller 1 with a variable, adjustable contact pressure. This contact pressure can also be kept constant by means of the pressure hose 15.
  • the scraper 6 is formed in FIG. 2 as a so-called plunger, which is used for rolls with a hard surface. This scraper 6 is called the plunger because it is inclined in the opposite direction to the direction of the press roll 1 or 2.
  • the scraper is designed as a so-called drag scraper and is so named because it is dragged or carried along by the running roller.
  • the drag scraper is used for rollers with a soft surface.

Abstract

The invention relates to a process and device for coating a travelling material web, especially paper or cardboard, with at least one liquid medium, in which the coating medium is conveyed to an application device with a spray nozzle fitted in an underpressure chamber to generate a spray mist. The spray mist is applied indirectly to the material web according to the invention in that it is applied to the outside of at least one roll and transferred to the material web from the roll.

Description

Verfahren und Einrichtung zum Beschichten einer laufenden Method and device for coating an ongoing
WarenbahnGoods web
Die Erfindung betrifft ein Verfahren zum Beschichten einer lau¬ fenden Warenbahn entsprechend dem Oberbegriff des Patentanspru¬ ches 1 sowie eine Beschichtungseinrichtung entsprechend dem Oberbegriff des Patentanspruches 2.The invention relates to a method for coating a running web of material in accordance with the preamble of claim 1 and a coating device in accordance with the preamble of claim 2.
Beschichtungseinrichtungen für Papier und Karton sind vielfältig bekannt, wobei z. B. gemäß GB 21 03 115 A die Übertragung von Beschichtungsmasse von den Walzenmänteln von zwei einander zuge¬ ordneten, zwischen sich einen Preßspalt bildenden Walzen auf die Warenbahn in dem Preßspalt erfolgt. Als Auftragswerke werden da¬ bei Düsenauftragswerke oder Tauchwalzen benutzt. Das Auftrags¬ werk verwendet eine Streichklinge zum Glätten und Dosieren der Auftragsschicht.Coating devices for paper and cardboard are widely known, z. B. according to GB 21 03 115 A, the transfer of coating material from the roll mantles of two mutually assigned, between them forming a press nip rolls on the web in the press nip. Nozzle applicators or dipping rollers are used as applicators. The application unit uses a doctor blade to smooth and dose the application layer.
Für die Beschichtung laufender Bahnen sind auch Auftragseinrich- tungen bekannt, die nach Art einer Gießauftragseinrichtung ar¬ beiten, und wobei die Gleichmäßigkeit und Haftfähigkeit der Gießschicht dadurch verbessert wird, daß ihr eine unter Vakuum stehende Kammer vorgeschaltet ist, die an der, die Warenbahn führende, Gegenwalze angeordnet ist. Ein mit der Vakuum-Kammer arbeitendes Gießverfahren ist in der US 3 735 729 beschrieben, welches allerdings nicht für Papierbahnen gebräuchlich ist. Hauptsächlich wird es bei der Beschichtung von Fotopapier ange¬ wandt, weil dort die Beschichtungsmassen eine höhere Konsistenz haben. Für das Beschichten von Papierbahnen mit Leim, der eine sehr niedrige Konsistenz und Viskosität hat, bestehen erhebliche Probleme.For the coating of running webs, application devices are also known which work in the manner of a casting application device, and the uniformity and adhesiveness of the casting layer is improved in that a chamber under vacuum is connected upstream of it, which chamber leads to the web of material , Counter roll is arranged. A casting process which works with the vacuum chamber is described in US Pat. No. 3,735,729, which is, however, not used for paper webs. It is mainly used in the coating of photographic paper because the coating compositions have a higher consistency there. There are considerable problems for coating paper webs with glue that has a very low consistency and viscosity.
Alle diese Erfindungen eignen sich für das Auftragen relativ großer Mengen von Beschichtungsmasse pro xτ Bahnflache. Sie versagen jedoch, wenn ein extrem kleines Auftragsgewicht je m2 gewünscht wird. Aus der EP 04 35 904 Bl ist ein Verfahren und eine Vorrichtung zum Beschichten von Papier, Pappe oder einem ähnlichen Substrat, welches sich kontinuierlich entlang eines Weges bewegt, bekannt.All of these inventions are suitable for the application of relatively large amounts of coating compound per xτ web area. However, they fail if an extremely small application weight per m 2 is desired. EP 04 35 904 B1 discloses a method and a device for coating paper, cardboard or a similar substrate which moves continuously along a path.
Das Beschichtungsmedium wird zu Nebel aufgeschlossen und einer Auftragsdüse mit einer Auftragsfläche zugeführt. Benachbart zur Auftragsfläche ist eine Vakuu kammer angeordnet zum Aufnehmen überschüssigen Nebels.The coating medium is broken down into mist and fed to an application nozzle with an application surface. A vacuum chamber is arranged adjacent to the application area for receiving excess mist.
Der erzeugte Sprühnebel wird durch eine "positive Kraft" (Über¬ druck) mittels der Auftragsdüse direkt auf das Substrat (Papier¬ bahn) aufgetragen. Auch bei dieser Methode ist es zweifelhaft,The spray mist generated is applied directly to the substrate (paper web) by a "positive force" (overpressure) by means of the application nozzle. With this method, too, it is doubtful
-*> ob ein extrem niedriges Auftragsgewicht j e irr mit der bei vielen- *> whether an extremely low order weight is different from that of many
Papiersorten notwendigen Gleichmäßigkeit auf die Papierbahn auf¬ getragen werden kann.Necessary uniformity of paper types can be applied to the paper web.
Schließlich ist es auch bekannt, bei sogenannten Luftmesserein¬ richtungen die Luftmesseranordnung in einem großen Vakuumbehäl¬ ter anzuordnen. Hierbei erfolgt durch das Luftmesser jedoch keine Beschichtung, sondern es wird Streichmasse an der Bahn abgeschabt und dosiert.Finally, it is also known to arrange the air knife arrangement in a large vacuum container in so-called air knife devices. In this case, however, the air knife does not apply any coating, but coating compound is scraped off and metered on the web.
Die Aufgabe der Erfindung ist es, ein Verfahren und eine Auf- tragseinrichtung bzw. Beschichtungseinrichtung für laufende Warenbahnen bei sehr geringen, extrem dünnen Auftragsschichten und dennoch gleichmäßigen Auftragsmengen, insbesondere für Leim¬ auftrag, anzugeben.The object of the invention is to provide a method and an application device or coating device for running webs of goods with very small, extremely thin application layers and nevertheless uniform application quantities, in particular for glue application.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kenn¬ zeichnenden Teils des Patentanspruches 1 und 2 gelöst.This object is achieved according to the invention by the features of the characterizing part of patent claims 1 and 2.
Das Sprühen von Beschichtungsmasse ist an sich in vielen Be¬ reichen der Technik üblich, jedoch kaum gebräuchlich für das Beschichten von laufenden Bahnen aus Papier oder Karton. Erfindungsgemäß wird durch den indirekten Auftrag, d. h. daß Sprühnebel auf eine nackte Walze aufgebracht und von der Waren¬ bahn abgenommen wird, ein Auftrag erreicht, der sowohl extrem dünn als auch sehr gleichmäßig ist, insbesondere auch quer zur Bahnlaufrichtung. Die Vergleichmäßigung erfolgt erfindungsgemäß an der Kontaktstelle zwischen Bahn und Walze, wo die Bahn den dünnen Flüssigkeitsfilm von der Walze übernimmt. Dabei kann die Bahn unter einer gewissen Zugspannung an der Walze anliegen, wobei die Bahn umgelenkt wird. Vorzugsweise läßt man die Bahn jedoch durch den von zwei Walzen gebildeten Preßspalt laufen. Hierdurch wird doppelseitiger Auftrag möglich.The spraying of coating material is common in many areas of technology, but is hardly used for coating running webs of paper or cardboard. According to the invention, the indirect application, that is to say that spray mist is applied to a bare roller and removed from the web, achieves an application which is both extremely thin and very uniform, in particular also transversely to the direction of web travel. The equalization takes place according to the invention at the contact point between the web and the roll, where the web takes over the thin liquid film from the roll. The web can rest against the roller under a certain tension, the web being deflected. However, the web is preferably allowed to run through the press nip formed by two rollers. This enables double-sided orders.
Die Erfindung macht Gebrauch von der, aus der EP 04 35 904 Bl bekannten Unterdruck- (Vakuum-)Kammer, die um die Sprühdüse herum angeordnet ist.The invention makes use of the vacuum (vacuum) chamber known from EP 04 35 904 B1, which is arranged around the spray nozzle.
Auch bei der vorliegenden Erfindung dient diese dazu, überschüs¬ sigen Nebel des Beschichtungsmediums abzusaugen. An der Innen¬ wandfläche kann sich aber ein Teil des Nebels niederschlagen.In the case of the present invention, too, this serves to suction off excess mist from the coating medium. However, part of the mist can deposit on the inner wall surface.
Nach einem wichtigen weiteren Gedanken der Erfindung wird durch die Anordnung einer Seitenwand an der ablaufenden Seite der zu¬ gehörigen Walzenoberfläche neben der Sprühdüse, innerhalb der Unterdruckkammer, eine Prallfläche für einen Teil des überschüs¬ sigen Sprühnebel geschaffen. Vorzugsweise ist die Prallfläche (Seitenwand) so ausgebildet bzw. vergrößert, daß sie eine innere Kammer um die Sprühdüse herum bildet. In dieser Kammer besteht durch den aus der Sprühdüse ausgestoßenen Sprühnebel ein gewis¬ ser Überdruck.According to an important further idea of the invention, the arrangement of a side wall on the draining side of the associated roller surface next to the spray nozzle, within the vacuum chamber, creates an impact surface for part of the excess spray mist. The baffle surface (side wall) is preferably designed or enlarged such that it forms an inner chamber around the spray nozzle. In this chamber there is a certain overpressure due to the spray mist ejected from the spray nozzle.
Die Prallfläche (Seitenwand oder innere Kammer) bewirkt zum einen, daß der Sprühnebel besser an die Walze gelangt, und zum anderen wird für eine Entlastung der Unterdruckkammer gesorgt, die ähnlich der EP 04 35 904 Bl ermöglicht, daß aus der Sprüh¬ düse austretendes Beschichtungsmedium (Sprühnebel) nicht aus der Kammer, d. h. dem zwischen Kammer und Gegenwalze vorhandenen Spalt, in die Umgebung austreten kann. Die aus der Umgebung ein¬ strömende Luft hält den Sprühnebel in der Kammer zurück, so daß dieser sich bei der Erfindung teils an der Prallfläche und teils an der Innenwandung der äußeren Kammer niederschlagen kann. Über einen Ausfluß kann das niedergeschlagene Beschichtungsmedium ab¬ laufen. In der äußeren oder inneren Kammer verbliebener, nieder¬ geschlagener Nebel wird beispielsweise über ein Sauggebläse einem Abscheider zugeführt, wobei das abgeschiedene sowie das direkt aus der Kammer ablaufende Medium einem gemeinsamen Sam¬ melbehälter für eine Wiederverwendung zugeführt werden kann.The impact surface (side wall or inner chamber) on the one hand causes the spray to reach the roller better, and on the other hand takes care of relieving the pressure in the vacuum chamber, which, similar to EP 04 35 904 B1, enables coating medium to emerge from the spray nozzle (Spray) cannot escape into the environment from the chamber, ie the gap between the chamber and the counter roller. The air flowing in from the environment retains the spray in the chamber, so that this can be reflected in the invention partly on the baffle and partly on the inner wall of the outer chamber. The deposited coating medium can run off through an outflow. Precipitated mist remaining in the outer or inner chamber is fed to a separator, for example via a suction fan, whereby the separated medium and the medium flowing directly out of the chamber can be fed to a common collecting container for reuse.
Nachfolgend wird die Erfindung anhand des in den Figuren der Zeichnung dargestellten Ausführungsbeispiels erläutert.The invention is explained below on the basis of the exemplary embodiment illustrated in the figures of the drawing.
Es zeigen:Show it:
Fig. 1: Eine prinzipmäßige GesamtdarstellungFig. 1: A general representation in principle
Fig. 2: Eine Einzelheit hinsichtlich der erfindungsgemäßen BeschichtungseinrichtungFig. 2: A detail regarding the coating device according to the invention
Fig. 3: Beschichtungseinrichtung mit einer anderen Schaber¬ anordnung3: Coating device with a different scraper arrangement
Fig. 4: Die Beschichtungseinrichtung mit einer anderen Variante zur inneren Kammer.Fig. 4: The coating device with another variant to the inner chamber.
In Fig. 1 wird die Bahn C in einem zwischen zwei Preßwalzen 1 und 2 gebildeten Preßspalt 11 geführt und dort beschichtet. Für die korrekte Führung der Bahn sind Führungsrollen 22 und 23 vor¬ gesehen. Die Auftragswerke für das Beschichtungsmedium sind hier mit 10 und 10' bezeichnet und im wesentlichen unterhalb der je¬ weils zugeordneten Preßwalze angeordnet; sie erstrecken sich im wesentlichen über die gesamte Länge der Preßwalzen.In Fig. 1, the web C is guided in a press nip 11 formed between two press rolls 1 and 2 and coated there. Guide rollers 22 and 23 are provided for the correct guidance of the web. The application units for the coating medium are designated here by 10 and 10 'and are arranged essentially below the respectively assigned press roll; they extend essentially over the entire length of the press rolls.
Anstelle der zwei Preßwalzen 1 und 2 mit je einem Auftragswerk 10 und 10' zum gleichzeitigen Beschichten beider Bahnseiten kann auch nur eine Auftragswalze mit einem Aufragswerk 10 oder 10' zum Beschichten von nur einer Bahnseite sowie zugeordneter Gegenwalze verwendet werden. Die Auftragswerke sind aus den Figuren 2, 3 und 4 entnehmbar, wo eines (10) dargestellt ist. Es weist im wesentlichen eine Sprüh¬ düse 4 auf. Wie bereits beschrieben, sprüht dieses Auftragswerk feine, nebelartige Sprühstrahlen des Beschichtungsmediums auf die Mantelfläche der Preßwalze (hier 1) . Die Sprudüse 4 ist, wie in Fig. 4 ersichtlich, in einer unter Unterdruck stehenden Kam¬ mer 3 angeordnet. In ihrer ablaufenden und auflaufenden Seite gegen die Oberfläche der zugehörigen Preßwalze 1 oder 2 (in Fig. 4 nur Auftrags- oder Preßwalze 1 dargestellt) ist sie mit einem Spalt 16 bzw. 16' abgedichtet, d.h. das aus der Sprühdüse 4 austretende Beschichtungsmedium wird an dieser Stelle zurück¬ gehalten und kann dadurch nicht in die Umgebung gelangen.Instead of the two press rolls 1 and 2, each with an applicator unit 10 and 10 'for simultaneous coating of both web sides, it is also possible to use only one applicator roller with one applicator unit 10 or 10' for coating only one web side and an associated counter roller. The application works can be seen in FIGS. 2, 3 and 4, where one (10) is shown. It essentially has a spray nozzle 4. As already described, this application unit sprays fine, mist-like spray jets of the coating medium onto the outer surface of the press roll (here 1). As can be seen in FIG. 4, the spray nozzle 4 is arranged in a chamber 3 which is under negative pressure. In its draining and running-up side against the surface of the associated press roll 1 or 2 (only applicator or press roll 1 shown in FIG. 4), it is sealed with a gap 16 or 16 ', ie the coating medium emerging from the spray nozzle 4 is applied held back at this point and therefore cannot get into the environment.
In dieser Fig. 4 ist die bevorzugte Ausführungsform der Erfin¬ dung dargestellt. In der Kammer 3 ist eine Seitenwand 7 in ge¬ ringem Abstand zur Sprühdüse 4 an der ablaufenden Seite ange¬ ordnet. Diese Seitenwand 7 wirkt als Prallfläche für einen Teil des überschüssigen Sprühnebels, der über den Spalt 18' in die Unterdruckkammer 3 gesaugt wird und von da aus über einen Abzug 30 (z. B. Sauggebläse) einem nicht in der Zeichnung dargestell¬ ten Abscheider zugeführt werden kann. An den Innenwänden der Kammer 3 sich niederschlagendes zurückfließendes Beschichtungs¬ medium läuft durch einen Abfluß 28 ab und kann mit dem im Ab¬ scheider abgetrennten Medium zusammengeführt und somit einer Wiederverwendung zugeführt werden.4 shows the preferred embodiment of the invention. In the chamber 3, a side wall 7 is arranged at a slight distance from the spray nozzle 4 on the draining side. This side wall 7 acts as an impact surface for part of the excess spray which is sucked into the vacuum chamber 3 via the gap 18 'and from there is fed to a separator (not shown in the drawing) via a trigger 30 (for example a suction fan) can be. On the inner walls of chamber 3, the refluxing coating medium runs down through a drain 28 and can be combined with the medium separated in the separator and thus be reused.
In einer anderen Ausführungsform ist die Sprühdüse 4, wie in Fig. 2 und 3 dargestellt ist, innerhalb einer inneren Kammer 5 angeordnet, wobei die Kammer 5 mittels Spalte 18 und 19 - ge¬ sehen in Laufrichtung der Walzenmantelfläche - eine Begrenzung ihres Innenraumes aufweist. Diese innere Kammer 5 ist innerhalb der äußeren Kammer 3 angeordnet, die unter Unterdruck gegenüber der Atmosphäre steht, der z.B. zwischen 50 und 300 MPa betragen kann. Auf der auflaufenden Seite der Kammer 3 kann sich, wie in den Ausführungsvarianten gemäß der Figuren 1 bis 3 zu sehen, ein Schaber 6 als Abdichtung der Kammer 3 befinden. Der Schaber ist in einer Halterung 12 mittels Druckschlauch 14, der ihn an die Rückwand der Unterdruckkammer 3 preßt, gehalten.In another embodiment, the spray nozzle 4, as shown in FIGS. 2 and 3, is arranged within an inner chamber 5, the chamber 5 being delimited by means of gaps 18 and 19, as seen in the running direction of the roll surface area. This inner chamber 5 is arranged inside the outer chamber 3, which is under vacuum from the atmosphere, which can be, for example, between 50 and 300 MPa. As can be seen in the embodiment variants according to FIGS. 1 to 3, a scraper 6 can be located on the upstream side of the chamber 3 as a seal for the chamber 3. The scraper is held in a holder 12 by means of pressure hose 14, which presses it against the rear wall of the vacuum chamber 3.
Ein weiterer Druckschlauch 15 ist in einer Halterung 13 ange¬ ordnet und preßt den Schaber gegen die Mantelfläche der Walze 1 mit variablem regelbaren Anpreßdruck. Dieser Anpreßdruck kann mittels des Druckschlauchs 15 auch konstant gehalten werden.Another pressure hose 15 is arranged in a holder 13 and presses the scraper against the outer surface of the roller 1 with a variable, adjustable contact pressure. This contact pressure can also be kept constant by means of the pressure hose 15.
Der Schaber 6 ist in Figur 2 als ein sogenannter Stechschaber ausgebildet, der für Walzen mit einer harten Oberfläche einge¬ setzt wird.. Dieser Schaber 6 wird Stechschaber genannt, weil er zur Laufrichtung der Preßwalze 1 oder 2 entgegengesetzt geneigt ist.The scraper 6 is formed in FIG. 2 as a so-called plunger, which is used for rolls with a hard surface. This scraper 6 is called the plunger because it is inclined in the opposite direction to the direction of the press roll 1 or 2.
In Fig. 3 ist der Schaber als sogenannter Schleppεchaber aus¬ gebildet und deshalb so bezeichnet, weil er von der laufenden Walze mitgeschleppt bzw. mitgeführt wird. Der Schleppschaber wird für Walzen mit einer weichen Oberfläche eingesetzt.In Fig. 3 the scraper is designed as a so-called drag scraper and is so named because it is dragged or carried along by the running roller. The drag scraper is used for rollers with a soft surface.
Durch das Pressen der von der Walzenoberfläche auf die Bahn übergehenden Leimmasse wird diese - soweit noch Unregelmäßig¬ keiten in der Schicht vorhanden sind - weiter und sehr stark vergleichmäßigt. Man erreicht so extrem niedrige Auftrags- gewichte zwischen 0,3 und 0,8 g/m2 , bezogen auf Trockenmasse. Dies ist eine sehr geringe Auftragsmenge, die mit den Mitteln gemäß Stand der Technik, insbesondere der EP 04 35 904 Bl, nicht mit der nötigen Gleichmäßigkeit aufzubringen ist, zumal gemäß dieser Lösung die Auftragsmenge direkt auf die Warenbahn auf¬ gebracht wird. Aufgrund der Ausbildung des Auftragswerkes als Sprüheinrichtung ist es nicht zwingend erforderlich, daß dieses unterhalb der Preßwalzen angeordnet ist, sondern es kann auch jeweils die oberen Teile von deren Mantelfläche besprühen. Dann ist der Bahnverlauf sowie die Drehrichtung der Walzen vorzugsweise umge¬ kehrt wie in Fig. 1 dargestellt. By pressing the glue mass that passes from the roller surface onto the web, it is further and very evenly leveled, insofar as irregularities are still present in the layer. Extremely low application weights of between 0.3 and 0.8 g / m 2 , based on dry matter, are achieved. This is a very small application quantity, which cannot be applied with the necessary uniformity using the means according to the prior art, in particular EP 04 35 904 B1, especially since according to this solution the application quantity is applied directly to the web. Due to the design of the application unit as a spray device, it is not absolutely necessary that it be arranged below the press rolls, but it can also spray the upper parts of the outer surface thereof. Then the course of the web and the direction of rotation of the rollers are preferably reversed as shown in FIG. 1.

Claims

— ö —Patentansprüche - ö —Patent claims
Verfahren zum Beschichten einer laufenden Warenbahn, ins¬ besondere Papier oder Karton, mit mindestens einem flüssigen Mediums, wobei das Beschichtungsmedium einer Auftragsein- richtung mit in einer Unterdruckkammer angeordneten Sprüh¬ düse zur Erzeugung eines Sprühnebels zugeführt wird, dadurch gekennzeichnet, daß der Sprühnebel in indirekter Weise dergestalt auf die Waren¬ bahn (9) aufgebracht wird, indem er auf die Mantelfläche mindestens einer Walze (1,2) aufgebracht und von der Walze auf die Warenbahn (C) übertragen wird.Process for coating a running web, in particular paper or cardboard, with at least one liquid medium, the coating medium being fed to an application device with a spray nozzle arranged in a vacuum chamber for producing a spray, characterized in that the spray is in indirect Is applied in such a way to the web (9) by applying it to the lateral surface of at least one roller (1, 2) and transferring it from the roller to the web (C).
Einrichtung zum Beschichten einer laufenden Warenbahn, ins¬ besondere Papier oder Karton, mit mindestens einem flüssigen Medium, wobei eine Auftragseinrichtung (10, 10') für das Be¬ schichtungsmedium mit in einer Unterdruckkammer (3) angeord¬ neten Sprühdüse (4) zur Erzeugung eines Sprühnebels vorgese¬ hen ist, dadurch gekennzeichnet, daß die Sprühdüse (4) auf die Mantelfläche einer Walze (1, 2) gerichtet ist, die das Beschichtungsmedium auf die Warenbahn (C) überträgt.Device for coating a running material web, in particular paper or cardboard, with at least one liquid medium, an application device (10, 10 ') for the coating medium having a spray nozzle (4) arranged in a vacuum chamber (3) for production of a spray mist is provided, characterized in that the spray nozzle (4) is directed onto the lateral surface of a roller (1, 2) which transfers the coating medium to the web (C).
Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß innerhalb der unter Unterdruck stehenden Kammer (3) an der ablaufenden Seite der zugehörigen Walzenoberfläche eine Seitenwand (7) , die als Prallfläche wirkt, angeordnet ist, wobei vorzugsweise die Seitenwand (7) derart ausgebildet ist, daß sie eine innere Kammer (5) bildet.Device according to claim 2, characterized in that a side wall (7), which acts as an impact surface, is arranged inside the chamber (3) under vacuum on the draining side of the associated roller surface, the side wall (7) preferably being designed in such a way that that it forms an inner chamber (5).
Einrichtung nach Anspruch 3, dadurch gekennzeichent, daß die innere Kammer (5) an der ab- und auflaufenden Seite gegen die Oberfläche der zugehörigen Walze (1,2) mit jeweils einem Spalt (18,19) abgedichtet ist. Device according to claim 3, characterized in that the inner chamber (5) is sealed on the up and down side against the surface of the associated roller (1, 2) with a respective gap (18, 19).
5. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die unter Unterdruck stehende Kammer (3) mindestens an ihrer ablaufenden Seite gegen die Oberfläche der zugehörigen Walze (1,2) mit einem Spalt (16) abgedichtet ist.5. Device according to claim 2, characterized in that the vacuum chamber (3) is sealed at least on its draining side against the surface of the associated roller (1,2) with a gap (16).
6. Einrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die unter Unterdruck stehende Kammer (3) an der auflaufenden Seite gegen die Oberfläche der zugehörigen Walze (1,2) mit einem Spalt (16') abgedichtet ist.6. Device according to claim 2, characterized in that the vacuum chamber (3) is sealed on the rising side against the surface of the associated roller (1,2) with a gap (16 ').
7. Einrichtung nach Anspruch 2, gekennzeichnet durch einen Schaber (6) als Abdichtung der (äußeren) Kammer (3) an ihrer auflaufenden Seite an der zugehörigen Walzenoberfläche.7. Device according to claim 2, characterized by a scraper (6) as a seal of the (outer) chamber (3) on its ascending side on the associated roller surface.
8. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß der Schaber (6) als Stechschaber derart ausgebildet ist, indem er in eine solche Richtung geneigt ist, die der Laufrichtung der Walze (1,2) entgegengesetzt ist.8. Device according to claim 7, characterized in that the scraper (6) is designed as a piercing scraper in such a way that it is inclined in a direction which is opposite to the running direction of the roller (1, 2).
9. Einrichtung nach Anspruch 7, dadurch gekennzeichnet, daß der Schaber (6) als Schleppschaber derart ausgebildet ist, indem er in Laufrichtung der Walze (1,2) geneigt ist.9. Device according to claim 7, characterized in that the scraper (6) is designed as a drag scraper such that it is inclined in the running direction of the roller (1,2).
10. Einrichtung nach einem der Ansprüche 2, 5, 6 oder 7, gekenn¬ zeichnet durch einen Abfluß (28) , der von der äußeren Kammer (3) abzweigt, um die angesammelte Beschichtungsmasse abzu¬ führen.10. Device according to one of claims 2, 5, 6 or 7, gekenn¬ characterized by a drain (28) which branches off from the outer chamber (3) in order to lead away the accumulated coating material.
11. Einrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß der Abfluß (28) von der inneren Kammer (5) abzweigt und durch die äußere Kammer (3) hindurchführt.11. The device according to claim 3 or 4, characterized in that the drain (28) branches off from the inner chamber (5) and passes through the outer chamber (3).
12. Einrichtung nach den Ansprüchen 1-11, dadurch gekennzeich¬ net, daß das Auftragsgewicht pro Seite der Warenbahn im Fall von Leim zwischen 0,3 und 0,8 g/m2 bezogen auf Trockenmasse beträgt. 3. Einrichtung nach den Ansprüchen 1 bis 12, dadurch gekenn¬ zeichnet, daß der Unterdruck in der Kammer (3) zwischen 50 und 300 MPa beträgt. 12. Device according to claims 1-11, characterized gekennzeich¬ net that the application weight per side of the web in the case of glue is between 0.3 and 0.8 g / m 2 based on dry matter. 3. Device according to claims 1 to 12, characterized gekenn¬ characterized in that the negative pressure in the chamber (3) is between 50 and 300 MPa.
EP94923652A 1993-09-14 1994-08-11 Process and device for coating a travelling material web Expired - Lifetime EP0670004B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4331160 1993-09-14
DE4331160 1993-09-14
PCT/DE1994/000933 WO1995008026A1 (en) 1993-09-14 1994-08-11 Process and device for coating a travelling material web

Publications (2)

Publication Number Publication Date
EP0670004A1 true EP0670004A1 (en) 1995-09-06
EP0670004B1 EP0670004B1 (en) 1997-04-23

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EP94923652A Expired - Lifetime EP0670004B1 (en) 1993-09-14 1994-08-11 Process and device for coating a travelling material web

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US (1) US6203858B1 (en)
EP (1) EP0670004B1 (en)
JP (1) JPH08503417A (en)
AT (1) ATE152193T1 (en)
CA (1) CA2149300A1 (en)
DE (1) DE59402523D1 (en)
WO (1) WO1995008026A1 (en)

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Also Published As

Publication number Publication date
EP0670004B1 (en) 1997-04-23
US6203858B1 (en) 2001-03-20
WO1995008026A1 (en) 1995-03-23
CA2149300A1 (en) 1995-03-23
DE59402523D1 (en) 1997-05-28
JPH08503417A (en) 1996-04-16
ATE152193T1 (en) 1997-05-15

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