EP0533035B1 - Apparatus for coating a fibrous web - Google Patents

Apparatus for coating a fibrous web Download PDF

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Publication number
EP0533035B1
EP0533035B1 EP92115379A EP92115379A EP0533035B1 EP 0533035 B1 EP0533035 B1 EP 0533035B1 EP 92115379 A EP92115379 A EP 92115379A EP 92115379 A EP92115379 A EP 92115379A EP 0533035 B1 EP0533035 B1 EP 0533035B1
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EP
European Patent Office
Prior art keywords
roll
nozzle
shell surface
liquid
doctor
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP92115379A
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German (de)
French (fr)
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EP0533035A1 (en
Inventor
Rudolf Beisswanger
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JM Voith GmbH
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JM Voith GmbH
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    • 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
    • B05C1/0817—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 removing partially liquid or other fluent material from the roller, e.g. scrapers
    • 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
    • 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
    • B05C9/04—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 liquid or other fluent material to opposite sides of the work

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • the liquid to be applied can be, for example, a glue suspension with which the paper web is impregnated; i.e. the glue suspension penetrates more or less completely into the interior of the paper web.
  • the liquid can also be a coating slip; This means a wide variety of pigment suspensions from which a cover layer is formed on the paper web. In both cases, the liquid can be applied to only one side of the paper web or to both sides of the paper web.
  • the invention is based on document 1, in particular on its figure 2.
  • Two applicator rollers are provided which form a nip with one another through which a paper web runs.
  • a nozzle applicator is assigned to each of the application rollers, each applying a coating color film to the surface of the roller concerned.
  • the nozzle applicator has a nozzle with two nozzle lips, one of which carries a roller doctor blade at its free end, which is a rod with a grooved outer surface. A metered application of coating color to the outer surface of the roller in question is thus possible.
  • cleaning device to clean the outer surface of the roller.
  • This cleaning device is located between the point at which the coating color film is passed from the outer surface of the roller to the paper web (delivery position) and the position at which the nozzle application unit applies the coating color film to the outer surface of the roller (feeding position).
  • Such cleaning devices are necessary for various reasons: on the one hand coating paint particles stick to the outer surface of the roller, and on the other hand fibers that are torn out of the paper web as it runs off the outer surface. These deposits represent a stubborn coating that accumulates with each revolution of the roller and leads to non-uniformities in the coating color film and to faults. Therefore it must be reliably removed.
  • the cleaning device comprises a scraper with a scraper blade, which in operation is positioned against the outer surface of the roller, and also a source of liquid.
  • the liquid source has two functions: On the one hand, it serves to spray cleaning liquid onto the outer surface, thus detaching the deposits or at least preparing to detach them. On the other hand, it must be ensured at all times that neither the doctor blade, the downstream doctor blade of the application nozzle is still running dry. These two elements must therefore be lubricated at all times. If this is not the case, the sensitive surface of the roller is damaged by the doctor blade or by the metering doctor.
  • the liquid source already before the start of the coating operation i.e. before loading the nozzle chamber with coating color and thus before applying a coating film on the outer surface of the roller, must release plenty of liquid in order to lubricate both the doctor blade and the doctor blade.
  • the liquid source is generally a spray tube which extends over the outer surface of the roller. The liquid is thus applied to the outer surface in excess before the coating operation begins, remains attached to it and passes through the gap between the doctor blade and the outer surface. Then part of this adhering liquid still travels with the outer surface and reaches the doctor blade in order to lubricate it as well. Another part gets into the coating color channel, which is arranged in front of the nozzle applicator to absorb excess coating color.
  • the metering knife is lubricated by the coating color and therefore no longer requires any special lubricant. Now all you have to do is ensure that the scraper blade receives enough lubricant (generally water). From this point on, the liquid source therefore needs to dispense less liquid. However, throttling the amount of liquid is also necessary, since otherwise there is an undesirable thinning and thus impairment of the coating film.
  • Time of the start of the coating operation ie the application of a coating color film to the outer surface of the roller
  • Timing of throttling of fluid intake Extent of throttling.
  • the invention has for its object to design a device according to the preamble of claim 1 such that the outer surface of the roller is cleaned perfectly, that the doctor blade and the doctor blade never run dry, and that a perfect coating color film of the desired strength and quality is placed on the applicator roll and is finally delivered to the fibrous web.
  • the features (e) and (f) ensure that the happenings in the area of the doctor blade come under control.
  • the width of the gap between the doctor blade and the lateral surface of the roller can be adjusted by means of a corresponding actuating device.
  • the amount of liquid that is dragged through the gap from the lateral surface of the roller can thus be precisely defined.
  • the features (g) and (h) ensure that the path of the liquid comes under control. All features help to prevent the scraper blade and metering knife from running dry and that there is no undesirable dilution of the excess of coating color in the coating color channel. For the coating color surplus there is still the coating color channel, but now there is also a special channel that takes up the cleaning liquid separately. The liquid in the coating color channel can thus be fed unchanged to the nozzle chamber for reuse.
  • the application device shown in FIG. 1 has two application rollers 10, 20, two nozzle application units 31, 41, two nozzle chambers 32, 42, one machine-wide nozzle lip 13, 23 each, one metering doctor 8, 8 and one coating ink channel 39, 49.
  • the two Application rollers 10, 20 rotate in the direction of arrows P.
  • a paper web 9 is passed through the nip formed between the two rollers.
  • the two nozzle chambers 32, 42 receive a coating color stream from pumps, not shown. A part of this stream reaches the nozzle and thus to its outlet, where it is metered by the metering doctor 8 in question and deposited as a film on the lateral surface of the roller 10, 20 in question. A smaller part passes over to the other nozzle lip as excess flow and arrives in the collecting channel 39, 49 in question.
  • the film mentioned is delivered to the paper web 9 in the area of the gap between the two rollers, so that this is provided with a line on both sides.
  • Figure 2 is also shown in principle as Figure 1, namely in a section perpendicular to the axis of the applicator roller 30.
  • the roller 30 is shown much larger in scale than the rollers 10, 20.
  • a roller applicator 51 is assigned to the roller 30. This comprises a nozzle chamber 52 and a nozzle 53.
  • the nozzle 53 has two lips 53.1 and 53.2 parallel to the axis of the application roller 30.
  • One lip 53.1 carries a so-called doctor blade 58. This is mounted in a doctor blade bed.
  • the other nozzle lip 53.2 carries an overflow bar 60.
  • a cleaning device is connected upstream of the nozzle applicator 51. This comprises a spray tube 70, a scraper 80 with a scraper blade 81 and a collecting channel 90 for collecting excess cleaning fluid.
  • FIG. 3 again shows, on an enlarged scale, the roller 30 on which the coating color film is to be applied, the scraper 80 of the cleaning device, the associated scraper blade 81 and a pressing device 83.
  • the pressing device can be pivoted about a pivot axis 84. It also has a blow-out hose 85, on which a strip 86 is formed, which extends over the entire width of the machine.
  • the pressing of the scraper blade 81 can be brought about by two processes: firstly, the entire pressing device 83 can be pivoted about the hinge axis 84 in the direction of the arrow, and secondly the hose 85 can be inflated.
  • the entire device is practically integrated into a single structural unit.
  • the nozzle applicator 51 is firmly connected via its overflow bar 60 to the wall 59.1 of the overflow channel 59.
  • the scraper 80 is also firmly connected to the wall 59.1.
  • a solution would also be conceivable in which the mutually facing walls of the nozzle applicator 51 and the collecting channel 59, namely the walls 52.1 and 59.1, are combined to form a single wall.
  • the doctor blade 58 does not necessarily have to be profiled. It can also have a non-profiled outer surface.

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  • Coating Apparatus (AREA)
  • Paper (AREA)

Abstract

The invention relates to an apparatus for applying coating composition to a fibre material web, having the following features: (a) an application roller which receives a coating compound film of the width of the machine and transfers it to the fibre material web, (b) a nozzle application system for forming and transferring the coating compound film, with a nozzle chamber of the width of the machine, and a nozzle, (c) an overflow channel which is to receive the excess stream, and (d) a cleaning device for the outer surface of the roller. Essentially, the invention provides that the scraper blade can be set for adjusting the gap width and forms part of a guide wall for discharging liquid which has been scraped off. <IMAGE>

Description

Die Erfindung betrifft eine Vorrichtung gemäß dem Oberbegriff von Anspruch 1.The invention relates to a device according to the preamble of claim 1.

Vorrichtungen dieser Art können innerhalb oder außerhalb einer Papier-Herstellungsmaschine angeordnet sein. Bei der aufzutragenden Flüssigkeit kann es sich beispielsweise um eine Leimsuspension handeln, mit der die Papierbahn imprägniert wird; d.h. die Leimsuspension penetriert mehr oder weniger vollkommen in das Innere der Papierbahn. Die Flüssigkeit kann aber auch eine Streichmasse sein; gemeint sind damit Pigment-Aufschwemmungen verschiedenster Art, aus denen auf der Papierbahn eine Deckschicht gebildet wird. In beiden Fällen kann die Flüssigkeit auf nur eine Seite der Papierbahn aufgetragen werden oder auf beide Seiten der Papierbahn.Devices of this type can be located inside or outside a paper making machine. The liquid to be applied can be, for example, a glue suspension with which the paper web is impregnated; i.e. the glue suspension penetrates more or less completely into the interior of the paper web. The liquid can also be a coating slip; This means a wide variety of pigment suspensions from which a cover layer is formed on the paper web. In both cases, the liquid can be applied to only one side of the paper web or to both sides of the paper web.

Druckschriften zum Stand der TechnikState of the art publications

  • 1. DE-U-8 414 4131. DE-U-8 414 413
  • 2. US-A-2,729,1922. US-A-2,729,192
  • 3. US-A-2,946,3073. US-A-2,946,307
  • 4. US-A-3,084,6634. US-A-3,084,663
  • 5. Wochenblatt für Papierfabrikation 1973, Seiten 164 bis 1695. Wochenblatt für Papierfabrikation 1973, pages 164 to 169
  • 6. Wochenblatt für Papierfabrikation 1978, Seiten 773 bis 7786. Wochenblatt für Papierfabrikation 1978, pages 773 to 778

Die Erfindung geht aus von Druckschrift 1, insbesondere von deren Figur 2. Dabei sind zwei Auftragswalzen vorgesehen, die einen Spalt miteinander bilden, durch den eine Papierbahn hindurchläuft. Beiden Auftragswalzen ist je ein Düsenauftragswerk zugeordnet, das jeweils einen Streichfarbenfilm auf die Mantel-Fläche der betreffenden Walze aufbringt. Das Düsenauftragswerk hat eine Düse mit zwei Düsenlippen, von denen die eine an ihrem freien Ende eine Rollrakel trägt, das ist ein Stab mit einer gerillten Mantelfläche. Damit ist ein dosiertes Auftragen von Streichfarbe auf die Mantelfläche der betreffenden Walze möglich.The invention is based on document 1, in particular on its figure 2. Two applicator rollers are provided which form a nip with one another through which a paper web runs. A nozzle applicator is assigned to each of the application rollers, each applying a coating color film to the surface of the roller concerned. The nozzle applicator has a nozzle with two nozzle lips, one of which carries a roller doctor blade at its free end, which is a rod with a grooved outer surface. A metered application of coating color to the outer surface of the roller in question is thus possible.

Wenn auch in dieser Darstellung nicht gezeigt, so ist in der Praxis jedoch stets eine Reinigungsvorrichtung vorhanden, um die Mantelfläche der Walze zu reinigen. Diese Reinigungsvorrichtung befindet sich zwischen derjenigen Stelle, an der der Streichfarbenfilm von der Mantelfläche der Walze an die Papierbahn gegeben wird (Abgabeposition) und derjenigen Position, an der das Düsenauftragswerk den Streichfarbenfilm auf die Mantelfläche der Walze aufgibt (Aufgabeposition). Solche Reinigungsvorrichtungen sind aus verschiedenen Gründen notwendig: Zum einen bleiben an der Mantelfläche der Walze Streichfarben-Partikel haften, zum anderen Fasern, die aus der Papierbahn bei deren Ablaufen von der Mantelfläche herausgerissen werden. Diese Ablagerungen stellen einen hartnäckigen Belag dar, der bei jedem Umlauf der Walze kumuliert und zu Ungleichförmigkeiten des Streichfarbenfilmes sowie zu Störungen führt. Deshalb muß er unbedingt zuverlässig beseitigt werden. Die Reinigungsvorrichtung umfaßt einen Schaber mit einer Schaberklinge, die im Betrieb gegen die Mantelfläche der Walze angestellt ist, ferner eine Flüssigkeitsquelle. Die Flüssigkeitsquelle hat zwei Aufgaben: Zum einen dient sie dazu, Reinigungsflüssigkeit auf die Mantelfläche zu sprühen, und damit die Ablagerungen abzulösen oder wenigsten deren Ablösung vorzubereiten. Zum anderen muß zu jedem Zeitpunkt sichergestellt sein, daß weder die Schaberklinge, noch die nachgeschaltete Rakel der Auftragsdüse trocken läuft. Diese beiden Elemente müssen somit zu jedem Zeitpunkt geschmiert werden. Ist dies nicht der Fall, so kommt es zu Beschädigungen der empfindlichen Mantelfläche der Walze durch die Schaberklinge oder durch die Dosierrakel.Although not shown in this illustration, in practice, however, there is always a cleaning device to clean the outer surface of the roller. This cleaning device is located between the point at which the coating color film is passed from the outer surface of the roller to the paper web (delivery position) and the position at which the nozzle application unit applies the coating color film to the outer surface of the roller (feeding position). Such cleaning devices are necessary for various reasons: on the one hand coating paint particles stick to the outer surface of the roller, and on the other hand fibers that are torn out of the paper web as it runs off the outer surface. These deposits represent a stubborn coating that accumulates with each revolution of the roller and leads to non-uniformities in the coating color film and to faults. Therefore it must be reliably removed. The cleaning device comprises a scraper with a scraper blade, which in operation is positioned against the outer surface of the roller, and also a source of liquid. The liquid source has two functions: On the one hand, it serves to spray cleaning liquid onto the outer surface, thus detaching the deposits or at least preparing to detach them. On the other hand, it must be ensured at all times that neither the doctor blade, the downstream doctor blade of the application nozzle is still running dry. These two elements must therefore be lubricated at all times. If this is not the case, the sensitive surface of the roller is damaged by the doctor blade or by the metering doctor.

Dies bedeutet, daß die Flüssigkeitsquelle bereits vor Aufnahme des Streichbetriebes, d.h. vor Beschicken der Düsenkammer mit Streichfarbe und damit vor dem Auftragen eines Streichfilmes auf die Mantelfläche der Walze reichlich Flüssigkeit abgeben muß, um sowohl die Schaberklinge, als auch die Rakel zu schmieren. Die Flüssigkeitsquelle ist im allgemeinen ein Spritzrohr, das sich über die Mantelfläche der Walze hinweg erstreckt. Die Flüssigkeit wird somit vor Aufnahme des Streichbetriebs im Übermaß auf die Mantelfläche aufgebracht, bleibt hieran hängen und tritt durch den Spalt zwischen der Schaberklinge und der Mantelfläche hindurch. Sodann wandert ein Teil dieser anhaftenden Flüssigkeit immer noch mit der Mantelfläche weiter und gelangt zur Rakel, um auch diese zu schmieren. Ein anderer Teil gelangt in die Streichfarbenrinne, die ja vor dem Düsenauftragswerk angeordnet ist, um überschüssige Streichfarbe aufzunehmen.This means that the liquid source already before the start of the coating operation, i.e. before loading the nozzle chamber with coating color and thus before applying a coating film on the outer surface of the roller, must release plenty of liquid in order to lubricate both the doctor blade and the doctor blade. The liquid source is generally a spray tube which extends over the outer surface of the roller. The liquid is thus applied to the outer surface in excess before the coating operation begins, remains attached to it and passes through the gap between the doctor blade and the outer surface. Then part of this adhering liquid still travels with the outer surface and reaches the doctor blade in order to lubricate it as well. Another part gets into the coating color channel, which is arranged in front of the nozzle applicator to absorb excess coating color.

Ist hingegen der Streichbetrieb aufgenommen und gibt die Düse einen Streichfarbenfilm in gewünschter Stärke an die Mantelfläche der Walze ab, so wird die Dosierrakel durch die Streichfarbe geschmiert und benötigt somit keine besondere Schmierflüssigkeit mehr. Jetzt muß lediglich dafür gesorgt werden, daß die Schaberklinge genügend Schmierflüssigkeit erhält (im allgemeinen Wasser). Die Flüssigkeitsquelle braucht somit von diesem Zeitpunkt an weniger Flüssigkeit abzugeben. Das Drosseln der Flüssigkeitsmenge ist aber auch notwendig, da es nämlich sonst zu einer unerwünschten Verdünnung und damit Beeinträchtigung des Streichfarbenfilmes kommt.If, on the other hand, the coating operation has started and the nozzle delivers a coating color film of the desired thickness to the outer surface of the roller, the metering knife is lubricated by the coating color and therefore no longer requires any special lubricant. Now all you have to do is ensure that the scraper blade receives enough lubricant (generally water). From this point on, the liquid source therefore needs to dispense less liquid. However, throttling the amount of liquid is also necessary, since otherwise there is an undesirable thinning and thus impairment of the coating film.

Hier beginnt das Problem. Es ist nämlich schwierig, die folgenden Parameter aufeinander abzustimmen:
   Zeitpunkt der Aufnahme des Streichbetriebes, d.h. des Aufgebens eines Streichfarbenfilms auf die Mantelfläche der Walze;
   Zeitpunkt des Drosselns der Flüssigkeitszufuhr;
   Ausmaß des Drosselns.This is where the problem begins. It is difficult to match the following parameters:
Time of the start of the coating operation, ie the application of a coating color film to the outer surface of the roller;
Timing of throttling of fluid intake;
Extent of throttling.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung gemäß dem Oberbegriff von Anspruch 1 derart zu gestalten, daß die Mantelfläche der Walze tadellos gereinigt wird, daß die Schaberklinge als auch die Dosierrakel zu keinem Zeitpunkt trocken laufen, und daß ein einwandfreier Streichfarbenfilm gewünschter Stärke und Beschaffenheit auf die Auftragswalze aufgegeben wird und schließlich an die Faserstoffbahn abgegeben wird.The invention has for its object to design a device according to the preamble of claim 1 such that the outer surface of the roller is cleaned perfectly, that the doctor blade and the doctor blade never run dry, and that a perfect coating color film of the desired strength and quality is placed on the applicator roll and is finally delivered to the fibrous web.

Diese Aufgabe wird durch die kennzeichnenden Merkmale von Anspruch 1 gelöst. Zu deren Lösung tragen die einzelnen Merkmale wie folgt bei:This object is solved by the characterizing features of claim 1. The individual features contribute to their solution as follows:

Die Merkmale (e) und (f) sorgen zunächst einmal dafür, daß das Geschehen im Bereich der Schaberklinge unter Kontrolle gelangt. Durch eine entsprechende Betätigungseinrichtung läßt sich die Weite des Spaltes zwischen der Schaberklinge und der Mantelfläche der Walze einstellen. Damit läßt sich die Menge der Flüssigkeit, die von der Mantelfläche der Walze durch den Spalt hindurchgeschleppt wird, genau definieren.The features (e) and (f) ensure that the happenings in the area of the doctor blade come under control. The width of the gap between the doctor blade and the lateral surface of the roller can be adjusted by means of a corresponding actuating device. The amount of liquid that is dragged through the gap from the lateral surface of the roller can thus be precisely defined.

Die Merkmale (g) und (h) sorgen dafür, daß der Weg der Flüssigkeit unter Kontrolle kommt. Alle Merkmale tragen dazu bei, daß ein Trockenlaufen der beiden Elemente Schaberklinge und Dosierrakel vermieden wird, und daß es nicht zu einer unerwünschten Verdünnung des Streichfarbenüberschusses in der Streichfarbenrinne kommt. Für den Streichfarbenüberschuss gibt es nach wie vor die Streichfarbenrinne, jedoch tritt nunmehr auch noch eine besondere Rinne hinzu, die die Reinigungsflüssigkeit getrennt aufnimmt. Die in der Streichfarbenrinne befindliche Flüssigkeit kann somit im Kreislauf unverändert der Düsenkammer zur erneuten Verwendung zugeführt werden.The features (g) and (h) ensure that the path of the liquid comes under control. All features help to prevent the scraper blade and metering knife from running dry and that there is no undesirable dilution of the excess of coating color in the coating color channel. For the coating color surplus there is still the coating color channel, but now there is also a special channel that takes up the cleaning liquid separately. The liquid in the coating color channel can thus be fed unchanged to the nozzle chamber for reuse.

Der Stand der Technik sowie die Erfindung sind anhand der Zeichnung näher erläutert. Darin ist im einzelnen folgendes dargestellt:

Figur 1
zeigt eine Vorrichtung gemäß dem Stand der Technik, und zwar entsprechend DG-GM 8 414 413
Figur 2
die wesentlichen Teile einer erfindungsgemäßen Auftragsvorrichtung, vor allem Auftragswalze, Düsenauftragswerk und Reinigungsvorrichtung.
Figur 3
zeigt ein Detail aus Figur 2.
The prior art and the invention are explained in more detail with reference to the drawing. The following is shown in detail:
Figure 1
shows a device according to the prior art, in accordance with DG-GM 8 414 413
Figure 2
the essential parts of an application device according to the invention, especially application roller, nozzle applicator and cleaning device.
Figure 3
shows a detail from FIG. 2.

Die in Figur 1 dargestellte Auftragsvorrichtung weist zwei Auftragswalzen 10, 20 auf, zwei Düsenauftragswerke 31, 41, zwei Düsenkammern 32, 42, je eine maschinenbreite Düsenlippe 13, 23, je eine Dosierrakel 8, 8 sowie je eine Streichfarbenrinne 39, 49. Die beiden Auftragswalzen 10, 20 laufen im Sinne der Pfeile P um. Eine Papierbahn 9 ist durch den Spalt hindurchgeführt, der zwischen den beiden Walzen gebildet ist.The application device shown in FIG. 1 has two application rollers 10, 20, two nozzle application units 31, 41, two nozzle chambers 32, 42, one machine-wide nozzle lip 13, 23 each, one metering doctor 8, 8 and one coating ink channel 39, 49. The two Application rollers 10, 20 rotate in the direction of arrows P. A paper web 9 is passed through the nip formed between the two rollers.

Im Betrieb erhalten die beiden Düsenkammern 32, 42 von nicht dargestellten Pumpen einen Streichfarbenstrom. Ein Teil dieses Stromes gelangt zur Düse und damit zu deren Auslauf, wo er durch die betreffende Dosierrakel 8 dosiert und als Film auf der Mantelfläche der betreffenden Walze 10, 20 abgelagert wird. Ein kleinerer Teil tritt an der anderen Düsenlippe als Überschußstrom über und gelangt in die betreffende Auffangrinne 39, 49. Der genannte Film wird im Bereich des Spaltes zwischen den beiden Walzen an die Papierbahn 9 abgegeben, so daß diese beidseits mit einem Strich versehen wird.In operation, the two nozzle chambers 32, 42 receive a coating color stream from pumps, not shown. A part of this stream reaches the nozzle and thus to its outlet, where it is metered by the metering doctor 8 in question and deposited as a film on the lateral surface of the roller 10, 20 in question. A smaller part passes over to the other nozzle lip as excess flow and arrives in the collecting channel 39, 49 in question. The film mentioned is delivered to the paper web 9 in the area of the gap between the two rollers, so that this is provided with a line on both sides.

Auch Figur 2 ist im Prinzip so dargestellt, wie Figur 1, nämlich in einem zur Achse der Auftragswalze 30 senkrechten Schnitt. Die Walze 30 ist gegenüber den Walzen 10, 20 im Maßstab wesentlich größer dargestellt.Figure 2 is also shown in principle as Figure 1, namely in a section perpendicular to the axis of the applicator roller 30. The roller 30 is shown much larger in scale than the rollers 10, 20.

Der Walze 30 ist ein Düsenauftragswerk 51 zugeordnet. Dieses umfaßt eine Düsenkammer 52 sowie eine Düse 53. Die Düse 53 weist zwei zur Achse der Auftragswalze 30 parallele Lippen 53.1 und 53.2 auf. Die eine Lippe 53.1 trägt eine sogenannte Rollrakel 58. Diese ist in einem Rollrakelbett gelagert. Die andere Düsenlippe 53.2 trägt eine Überlaufleiste 60.A roller applicator 51 is assigned to the roller 30. This comprises a nozzle chamber 52 and a nozzle 53. The nozzle 53 has two lips 53.1 and 53.2 parallel to the axis of the application roller 30. One lip 53.1 carries a so-called doctor blade 58. This is mounted in a doctor blade bed. The other nozzle lip 53.2 carries an overflow bar 60.

Man erkennt ferner eine Überlaufrinne 59 zur Aufnahme desjenigen Überlaufstromes von Streichfarbe, der über die Überlaufleiste 60 übergetreten ist.One can also see an overflow channel 59 for receiving that overflow stream of coating color which has passed over the overflow bar 60.

Dem Düsenauftragswerk 51 ist eine Reinigungsvorrichtung vorgeschaltet. Diese umfaßt ein Spritzrohr 70, einen Schaber 80 mit Schaberklinge 81 sowie eine Auffangrinne 90 zum Auffangen überschüssiger Reinigungsflüssigkeit.A cleaning device is connected upstream of the nozzle applicator 51. This comprises a spray tube 70, a scraper 80 with a scraper blade 81 and a collecting channel 90 for collecting excess cleaning fluid.

Das in Figur 3 dargestellte Detail zeigt in vergrößertem Maßstab wiederum die Walze 30, auf welche der Streichfarbenfilm aufzutragen ist, den Schaber 80 der Reinigungsvorrichtung, die zugehörende Schaberklinge 81 sowie eine Andrückvorrichtung 83. Die Andrückvorrichtung ist um eine Schwenkachse 84 verschwenkbar. Sie weist ferner einen ausblasbaren Schlauch 85 auf, dem eine Leiste 86 angeformt ist, die sich über die gesamte Maschinenbreite erstreckt. Das Andrücken der Schaberklinge 81 kann durch zwei Vorgänge bewirkt werden: Zum einen kann die gesamte Andrückvorrichtung 83 um die Gelenkachse 84 in Pfeilrichtung verschwenkt werden, zum anderen kann der Schlauch 85 aufgeblasen werden.The detail shown in FIG. 3 again shows, on an enlarged scale, the roller 30 on which the coating color film is to be applied, the scraper 80 of the cleaning device, the associated scraper blade 81 and a pressing device 83. The pressing device can be pivoted about a pivot axis 84. It also has a blow-out hose 85, on which a strip 86 is formed, which extends over the entire width of the machine. The pressing of the scraper blade 81 can be brought about by two processes: firstly, the entire pressing device 83 can be pivoted about the hinge axis 84 in the direction of the arrow, and secondly the hose 85 can be inflated.

Durch eine entsprechende Steuerung wird sichergestellt, daß ein Andrücken der Klinge 81 nur dann erfolgen kann, wenn Spritzrohr 70 arbeitet und Flüssigkeit, z.B. Wasser, gegen die Mantelfläche der Walze 30 sprüht.Appropriate control ensures that the blade 81 can only be pressed on when the spray tube 70 is working and liquid, e.g. Water, sprayed against the outer surface of the roller 30.

Wie man aus Figur 2 erkennt, ist die gesamte Vorrichtung praktisch zu einer einzigen Baueinheit integriert. Das Düsenauftragswerk 51 ist über seine Überlaufleiste 60 mit der Wand 59.1 der Überlaufrinne 59 fest verbunden. Der Schaber 80 ist ebenfalls mit der Wand 59.1 fest verbunden. Denkbar wäre auch eine Lösung, bei welcher die einander zugewandten Wände des Düsenauftragswerkes 51 und der Auffangrinne 59, nämlich die Wände 52.1 und 59.1 zu einer einzigen Wand zusammengefaßt sind.As can be seen from Figure 2, the entire device is practically integrated into a single structural unit. The nozzle applicator 51 is firmly connected via its overflow bar 60 to the wall 59.1 of the overflow channel 59. The scraper 80 is also firmly connected to the wall 59.1. A solution would also be conceivable in which the mutually facing walls of the nozzle applicator 51 and the collecting channel 59, namely the walls 52.1 and 59.1, are combined to form a single wall.

Die Dosierrakel 58 muß nicht unbedingt profiliert sein. Sie kann auch eine nicht-profilierte Mantelfläche haben.The doctor blade 58 does not necessarily have to be profiled. It can also have a non-profiled outer surface.

Claims (4)

  1. An apparatus for applying coating slip to a fibrous web, having the following features:
    (a) An applicator roll (30), which at a charging position of its shell surface receives a machine-width film of coating slip, and at a transfer position transfers it to the fibrous web (9);
    (b) a nozzle applicator unit (31, 41, 51) for forming and transferring the film of coating slip, having a machine-width nozzle chamber (52) and a nozzle (53) provided after it with two machine-width lips (53.1, 53.2), one of which bears a metering doctor (58) at its free end, which with the shell surface of the roll (30) forms an outlet nip for the film of coating slip, and the other (60) of which with the shell surface of the roll (30) forms an overflow nip for the excess flow of coating slip;
    (c) an overflow channel (59) for receiving the excess flow;
    (d) a cleaning device (90) for the shell surface of the roll, disposed in the direction of rotation of the roll between the transfer position and the charging position, having a doctor (80) and a liquid source (70) provided in front of it for the application of liquid to the shell surface of roll (30),
    characterised by the following features:
    (e) The doctor blade (81) can be set for the purpose of adjusting the nip width between the end edge of the blade (81) and the shell surface of the roll (30);
    (f) a mechanism for adjusting the blade (81) is provided;
    (g) a liquid collecting channel (90) is provided in front of the doctor (80);
    (h) the doctor blade (81) forms a part of a baffle for diverting removed liquid into the liquid collecting channel (90).
  2. An apparatus according to Claim 1,
    characterised in that the two collecting channels (59, 90) are disposed close to one another and form a structural unit.
  3. An apparatus according to one of Claims 1 or 2,
    characterised in that the rear wall (52.1) of the nozzle application unit (51) and the front wall (59.1) of the coating slip collection channel (59) form a single wall with one another, which bears the overflow bar (60) in its region close to the shell surface of the roll (30).
  4. An apparatus according to one of Claims 1 to 3,
    characterised in that a pressure device (83) is associated with the doctor blade (81) and is controlled so that it only applies the doctor blade (81) against the shell surface of the roll (30) when the liquid source (spray pipe 70) is switched on.
EP92115379A 1991-09-19 1992-09-09 Apparatus for coating a fibrous web Expired - Lifetime EP0533035B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4131131A DE4131131C2 (en) 1991-09-19 1991-09-19 Device for applying coating color on a fibrous web
DE4131131 1991-09-19

Publications (2)

Publication Number Publication Date
EP0533035A1 EP0533035A1 (en) 1993-03-24
EP0533035B1 true EP0533035B1 (en) 1995-03-08

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ID=6440939

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Application Number Title Priority Date Filing Date
EP92115379A Expired - Lifetime EP0533035B1 (en) 1991-09-19 1992-09-09 Apparatus for coating a fibrous web

Country Status (7)

Country Link
US (1) US5328511A (en)
EP (1) EP0533035B1 (en)
JP (1) JPH05228412A (en)
AT (1) ATE119596T1 (en)
CA (1) CA2078735A1 (en)
DE (2) DE4131131C2 (en)
FI (1) FI96339C (en)

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Also Published As

Publication number Publication date
FI96339C (en) 1996-06-10
DE4131131C2 (en) 1994-07-21
FI96339B (en) 1996-02-29
FI924206A (en) 1993-03-20
JPH05228412A (en) 1993-09-07
CA2078735A1 (en) 1993-03-20
US5328511A (en) 1994-07-12
DE4131131A1 (en) 1993-03-25
ATE119596T1 (en) 1995-03-15
EP0533035A1 (en) 1993-03-24
DE59201594D1 (en) 1995-04-13
FI924206A0 (en) 1992-09-18

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