EP0481024B1 - Process for coating a web of material, especially paper or cardboard - Google Patents

Process for coating a web of material, especially paper or cardboard Download PDF

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Publication number
EP0481024B1
EP0481024B1 EP91906670A EP91906670A EP0481024B1 EP 0481024 B1 EP0481024 B1 EP 0481024B1 EP 91906670 A EP91906670 A EP 91906670A EP 91906670 A EP91906670 A EP 91906670A EP 0481024 B1 EP0481024 B1 EP 0481024B1
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EP
European Patent Office
Prior art keywords
web
transfer roller
roller
coating
round
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EP91906670A
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German (de)
French (fr)
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EP0481024A1 (en
Inventor
Herbert Sommer
Günter Franz
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Jagenberg AG
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Jagenberg AG
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Publication of EP0481024A1 publication Critical patent/EP0481024A1/en
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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
    • B05C1/0839—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 unsupported at the line of contact between the coating roller and the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • 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
    • 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
    • B05C1/12—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 fed round 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D21H25/16—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with a blast of vapour or gas, e.g. air knife

Definitions

  • the invention relates to a device for coating a material web, in particular a paper or cardboard web, according to the preamble of patent claim 1.
  • Coating devices of this type are used in particular for coating cardboard in order to achieve a voluminous application with a uniform layer cover following the surface contour.
  • US-A-3,235,401 describes a generic device in which the material web to be coated is deflected by a guide roller to a transfer roller of an application unit.
  • the transfer roller draws coating color from a paint tray and applies it in excess to the web.
  • the web is guided, following the transfer roller, over a driven roller doctor rod provided with a wire winding.
  • a counter roller At a distance from the doctor blade rod, there is a counter roller which deflects the web, an air knife being arranged in the looped area, which strips off the excess coating color to the desired coat weight.
  • DE-U-84 14 413 describes a device for coating a material web with an application unit with a driven transfer roller, partly wrapped around by the web, for applying coating material to the web and a roller doctor bar with extensive elevations and depressions, which are elastically supported on the transfer roller is pressable.
  • the transfer roller is used for direct final metering.
  • the invention has for its object to improve a generic coating device so that significantly higher production speeds can be achieved without degradation.
  • a uniform application with a small excess is generated on the transfer roller, which is transferred evenly and without errors to the web due to the arrangement of the guide roller.
  • the short distance between the applicator and the air knife significantly reduces the problems with final dosing caused by dewatering the coating color.
  • Fig. 1 shows a schematic side view of a coating device according to the invention.
  • the material web 1 to be coated, a paper or cardboard web is deflected by a guide roller 2, guided approximately tangentially to the upper part of a transfer roller 3 of an applicator unit 4.
  • the rubber-coated transfer roller 3 has a smooth outer surface. It dips with its lower part into a paint trough 5, into which excess coating slip is continuously introduced and kept at a constant level by means of overflows 6 arranged on both sides.
  • the transfer roller 3 rotates in the opposite direction to the running direction of the web 1, the gap to the guide roller 2 is less than 8 mm, preferably 0.5-3 mm. This small gap width ensures that the web 1 is applied flatly to the transfer roller 3 in order to ensure a uniform transfer of the coating color from the transfer roller 3 to the web 1.
  • another inking unit e.g. B. a nozzle applicator, can be arranged for applying coating color in excess.
  • a machine-wide roller doctor rod 7 is mounted in an elastic holder 8, which can be pressed against the surface of the transfer roller 3 with an adjustable contact pressure.
  • the roller doctor rod 7, which is driven in the same direction as the transfer roller 3 - that is to say in the opposite direction at the point of contact - has elevations and depressions on its surface. It preferably contains circumferential grooves that were produced either by wrapping with a wire or by surface treatment.
  • the wire has a diameter of 0.6 mm - 1 mm, otherwise the surface of the doctor rod 7 is machined so that there is a flow cross-section corresponding to this wire diameter.
  • a counter roller 9 follows at the shortest possible distance, which deflects the web 1 by at least 90 °.
  • an air knife 10 is arranged as a metering device, which contains, as an essential component, a slot nozzle 11 with which an accelerated, sharp air jet is directed onto the web 1 in order to strip off the coating color to the desired coat weight.
  • slot nozzles are known and z. B. described in DE-A-30 48 133 and DE-A-30 48 134.
  • double air knives are usually used, which have two slot nozzles in a support body.
  • the distance between the transfer roller 3 and the air knife 10 must be as small as possible in order to avoid dewatering of the coating color before the final metering. Since both the transfer roller 3 and the counter roller 9 have to be appropriately large (up to 800 mm in diameter) for large working widths (e.g. 8 m) for reasons of stability, a certain distance between the transfer roller 3 and the counter roller 9 is due to the design. measured as the distance between the two axes of rotation - required. This distance is less than 1500 mm, preferably less than 800 mm.
  • the web 1 is laid flat on the transfer roller 3 by the guide roller 2.
  • the transfer roller 3 draws from the tub 5 coating color in excess, which is stripped from the doctor blade 7 to 1.1 to 2 times the desired coating weight after the final metering with the air knife 10.
  • the doctor blade rod 7 produces a very uniform film on the surface of the transfer roller 3, which is then transferred to the web 1. It has been shown that a uniform layer with a small excess amount can be produced on the web 1 if the gap width between the guide roller 2 and the transfer roller 3 is less than 8 mm, in particular in the range between 0.5 and 3 mm, and the ratio of web speed / peripheral speed of the transfer roller 3 is within a certain range.
  • the ratio of the two speeds depends on the specific flow cross section A of the doctor rod 7 at the line of contact with the transfer roller 3.
  • the ratio is preferably 0.015 x A to 0.022 x A, the specific flow cross section in mm 2 per m of doctor blade length being used for A. For wire-wound doctor blades with a diameter of 1 mm, this gives a ratio of 1.61 - 2.36.
  • the axis of rotation of the guide roller 2 is adjustable.
  • the wrap angle on the transfer roller 3 is between 5 ° and 30 °.
  • the air knife 10 follows as close as possible behind the applicator 4. With the air knife 10, the small excess amount of 10 - 100% is removed and the desired coat weight is achieved.
  • the transfer roller 3 is preferably driven in the opposite direction to the running direction of the web 1.
  • the doctor rod 7 is therefore arranged on the outlet side of the web 1 (on the right in FIG. 1).
  • the direction of rotation of the transfer roller 3 can be reversed, that is, a concurrent application of paint.
  • the doctor blade rod 7 'with its holder 8' is located on the inlet side of the transfer roller 3 (shown in broken lines in FIG. 1). The advantages described then only occur in part.

Landscapes

  • Paper (AREA)
  • Coating Apparatus (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Abstract

PCT No. PCT/EP91/00596 Sec. 371 Date Jan. 22, 1992 Sec. 102(e) Date Jan. 22, 1992 PCT Filed Mar. 27, 1991 PCT Pub. No. WO91/17309 PCT Pub. Date Nov. 14, 1991.A coating device includes a transfer roller communicating with a bank of coating material and engaging a web of material to be coated, a squeegee bung mounted to resiliently press against a periphery of the transfer roller and to define a contact surface across which the coating material flows, and a counter roller provided with an air blade for final dosing of the coating material applied to the web.

Description

Die Erfindung betrifft eine Vorrichtung zum Beschichten einer Materialbahn, insbesondere einer Papier- oder Kartonbahn, gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for coating a material web, in particular a paper or cardboard web, according to the preamble of patent claim 1.

Derartige, als Luftmessermaschinen bezeichnete Beschichtungsvorrichtungen werden insbesondere zum Beschichten von Karton eingesetzt, um einen der Oberflächenkontur folgenden voluminösen Auftrag mit gleichmäßiger Schichtdecke zu erzielen.Coating devices of this type, referred to as air knife machines, are used in particular for coating cardboard in order to achieve a voluminous application with a uniform layer cover following the surface contour.

Die US-A-3,235,401 beschreibt eine gattungsgemäße Vorrichtung, bei der die zu beschichtende Materialbahn von einer Leitrolle an eine Übergabewalze eines Auftragwerks umgelenkt wird. Die Übergabewalze schöpft Streichfarbe aus einer Farbwanne und trägt sie im Überschuß auf die Bahn auf. Um einen Teil der im Überschuß aufgetragenen Streichfarbe abzustreifen, wird die Bahn im Anschluß an die Übergabewalze über einen angetriebenen, mit einer Drahtumwicklung versehenen Rollrakelstab geführt. Mit Abstand auf den Rollrakelstab folgt eine Gegenwalze, die die Bahn umlenkt, wobei im umschlungenen Bereich ein Luftmesser angeordnet ist, das die überschüssige Streichfarbe bis auf das gewünschte Strichgewicht abstreift.US-A-3,235,401 describes a generic device in which the material web to be coated is deflected by a guide roller to a transfer roller of an application unit. The transfer roller draws coating color from a paint tray and applies it in excess to the web. In order to strip off part of the coating color applied in excess, the web is guided, following the transfer roller, over a driven roller doctor rod provided with a wire winding. At a distance from the doctor blade rod, there is a counter roller which deflects the web, an air knife being arranged in the looped area, which strips off the excess coating color to the desired coat weight.

Aus der DE-A-10 30 168 ist eine weitere Beschichtungsvorrichtung mit einem Luftmesser als Enddosiereinrichtung bekannt, das eine teilweise umschlungene Gegenwalze und eine im umschlungenen Bereich angeordnete Schlitzdüse aufweist. Der Überschußauftrag wird vor dem Luftmesser nicht vordosiert oder vergleichmäßigt.From DE-A-10 30 168 a further coating device with an air knife as a final metering device is known, which has a partially wrapped counter roll and a slot nozzle arranged in the wrapped area. The excess order is not pre-metered or equalized before the air knife.

Die DE-U-84 14 413 beschreibt eine Vorrichtung zum Beschichten einer Materialbahn mit einem Auftragwerk mit einer angetriebenen, teilweise von der Bahn umschlungenen Übergabewalze zum Auftragen von Beschichtungsmaterial auf die Bahn und einem Rollrakelstab mit umfänglichen Erhebungen und Vertiefungen, der an die Übergabewalze elastisch gelagert andrückbar ist. Bei dieser Vorrichtung wird mit der Übergabewalze direkt enddosiert.DE-U-84 14 413 describes a device for coating a material web with an application unit with a driven transfer roller, partly wrapped around by the web, for applying coating material to the web and a roller doctor bar with extensive elevations and depressions, which are elastically supported on the transfer roller is pressable. In this device, the transfer roller is used for direct final metering.

Es ist ein Nachteil der bekannten Luftmessermaschinen, daß sie, insbesondere bei großen Arbeitsbreiten, nur bei beschränkten Produktionsgeschwindigkeiten (< 500 m/min) eine geschlossene und gleichmäßige Abdeckung der Materialbahn erzielt wird.It is a disadvantage of the known air knife machines that, especially with large working widths, they only achieve a closed and uniform covering of the material web at limited production speeds (<500 m / min).

Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemäße Beschichtungsvorrichtung so zu verbessern, daß ohne Qualitätsminderung erheblich höhere Produktionsgeschwindigkeiten erreicht werden können.The invention has for its object to improve a generic coating device so that significantly higher production speeds can be achieved without degradation.

Diese Aufgabe wird mit den kennzeichnenden Merkmalen des Patentanspruchs 1 gelöst.This object is achieved with the characterizing features of patent claim 1.

Es hat sich gezeigt, daß als Enddosiereinrichtungen eingesetzte Luftmesser aufgrund des mit der Bahngeschwindigkeit überproportional zunehmenden Impulses der Streichfarbe bei steigenden Bahngeschwindigkeiten immer geringere Überschußmengen entfernen können. Voraussetzung für einen möglichst geringen Überschußauftrag ist jedoch ein sehr gleichmäßiger Auftrag ohne lokale Überhöhungen, z. B. in Form von Streifen, der mit dem gattungsgemäßen Auftragwerk bei hohen Geschwindigkeiten nicht zu erreichen ist. Darüber hinaus stellen sich Schwierigkeiten, z. B. Entwässerung der aufgetragenen Streichfarbe, bei geringen Überschußmengen ein, die das Enddosieren mit dem Luftmesser beeinträchtigen. Dieser Effekt tritt auch beim Vordosieren auf der Bahn, z. B. mit einer Rakel oder einer sogenannten Vordosierwalze, auf.It has been shown that air meters used as final metering devices can remove ever smaller excess amounts due to the pulse of the coating color, which increases disproportionately with the web speed, with increasing web speeds. However, a prerequisite for the smallest possible excess order is a very even order without local excesses, e.g. B. in the form of strips, which can not be achieved with the generic application at high speeds. In addition, there are difficulties such. B. Drainage the applied coating color, with small excess amounts, which impair the final metering with the air knife. This effect also occurs when predosing on the web, e.g. B. with a doctor or a so-called pre-metering roller.

Nach der Erfindung wird bereits auf der Übergabewalze ein gleichmäßiger Auftrag mit geringem Überschuß erzeugt, der aufgrund der Anordnung der Leitrolle gleichmäßig und fehlerfrei auf die Bahn übertragen wird. Durch den geringen Abstand zwischen Auftragwerk und Luftmesser werden die durch Entwässerung der Streichfarbe entstehenden Probleme beim Enddosieren erheblich reduziert.According to the invention, a uniform application with a small excess is generated on the transfer roller, which is transferred evenly and without errors to the web due to the arrangement of the guide roller. The short distance between the applicator and the air knife significantly reduces the problems with final dosing caused by dewatering the coating color.

Die abhängigen Ansprüche enthalten bevorzugte, da besonders vorteilhafte Ausgestaltungen der Erfindung.The dependent claims contain preferred, since particularly advantageous, embodiments of the invention.

Die Zeichnung dient zur Erläuterung der Erfindung anhand eines vereinfacht dargestellten Ausführungsbeispiels.The drawing serves to explain the invention with reference to an embodiment shown in simplified form.

Fig. 1 zeigt grob schematisch in Seitenansicht eine Beschichtungsvorrichtung nach der Erfindung.Fig. 1 shows a schematic side view of a coating device according to the invention.

Die zu beschichtende Materialbahn 1, eine Papier- oder Kartonbahn, wird von einer Leitrolle 2 umgelenkt in etwa tangential an den oberen Teil einer Übergabewalze 3 eines Auftragwerks 4 herangeführt. Die gummibeschichtete Übergabewalze 3 weist eine glatte Mantelfläche auf. Sie taucht mit ihrem unteren Teil in eine Farbwanne 5 ein, in die kontinuierlich Streichmasse im Überschuß eingeleitet und mittels beidseitig angeordneter Überläufe 6 auf konstantem Niveau gehalten wird. Die Übergabewalze 3 dreht sich gegenläufig zur Laufrichtung der Bahn 1, wobei der Spalt zu der Leitrolle 2 weniger als 8 mm, bevorzugt 0,5 - 3 mm, beträgt. Durch diese geringe Spaltweite wird ein flächiges Anlegen der Bahn 1 an die Übergabewalze 3 gewährleistet, um eine gleichmäßige Übertragung der Streichfarbe von der Übergabewalze 3 an die Bahn 1 sicherzustellen.The material web 1 to be coated, a paper or cardboard web, is deflected by a guide roller 2, guided approximately tangentially to the upper part of a transfer roller 3 of an applicator unit 4. The rubber-coated transfer roller 3 has a smooth outer surface. It dips with its lower part into a paint trough 5, into which excess coating slip is continuously introduced and kept at a constant level by means of overflows 6 arranged on both sides. The transfer roller 3 rotates in the opposite direction to the running direction of the web 1, the gap to the guide roller 2 is less than 8 mm, preferably 0.5-3 mm. This small gap width ensures that the web 1 is applied flatly to the transfer roller 3 in order to ensure a uniform transfer of the coating color from the transfer roller 3 to the web 1.

Anstelle der Farbwanne 5 kann an der Übergabewalze 3 auch ein anderes Farbauftragwerk, z. B. ein Düsenauftragwerk, zum Aufbringen von Streichfarbe im Überschuß angeordnet sein.Instead of the ink pan 5, another inking unit, e.g. B. a nozzle applicator, can be arranged for applying coating color in excess.

Am aufwärts bewegten Umfang der Übergabewalze 3 ist im Bereich zwischen Farbwanne 5 und Bahn 1 ein maschinenbreiter Rollrakelstab 7 in einer elastischen Halterung 8 gelagert, der mit einer einstellbaren Anpreßkraft gegen die Oberfläche der Übergabewalze 3 andrückbar ist. Der gleichsinnig zur Übergabewalze 3 - also an der Berührungsstelle gegenläufig - angetriebene Rollrakelstab 7 weist an seiner Oberfläche Erhebungen und Vertiefungen auf. Bevorzugt enthält er Umfangsrillen, die entweder durch eine Umwicklung mit einem Draht oder durch Oberflächenbearbeitung erzeugt wurden. Beim Einsatz eines drahtumwickelten Rakelstabes 7 weist der Draht einen Durchmesser von 0,6 mm - 1 mm auf, andernfalls ist die Oberfläche des Rakelstabes 7 so bearbeitet, daß ein diesem Drahtdurchmesser entsprechender Durchflußquerschnitt vorliegt.On the upwardly moving circumference of the transfer roller 3, in the area between the ink tray 5 and the web 1, a machine-wide roller doctor rod 7 is mounted in an elastic holder 8, which can be pressed against the surface of the transfer roller 3 with an adjustable contact pressure. The roller doctor rod 7, which is driven in the same direction as the transfer roller 3 - that is to say in the opposite direction at the point of contact - has elevations and depressions on its surface. It preferably contains circumferential grooves that were produced either by wrapping with a wire or by surface treatment. When using a wire-wound doctor rod 7, the wire has a diameter of 0.6 mm - 1 mm, otherwise the surface of the doctor rod 7 is machined so that there is a flow cross-section corresponding to this wire diameter.

In Bahnlaufrichtung hinter der Übergabewalze 3 folgt mit möglichst kurzem Abstand eine Gegenwalze 9, die die Bahn 1 um mindestens 90° umlenkt. Im umschlungenen Bereich ist als Dosiereinrichtung ein Luftmesser 10 angeordnet, das als wesentlichen Bestandteil eine Schlitzdüse 11 enthält, mit der ein beschleunigter, scharfer Luftstrahl auf die Bahn 1 geleitet wird, um die Streichfarbe bis auf das gewünschte Strichgewicht abzustreifen. Derartige Schlitzdüsen sind bekannt und z. B. in der DE-A-30 48 133 und der DE-A-30 48 134 beschrieben. Bei höheren Bahngeschwindigkeiten werden üblicherweise Doppelluftmesser eingesetzt, die zwei Schlitzdüsen in einem Tragkörper aufweisen. In der Schlitzdüse 11 herrscht ein Überdruck von 0,3 - 0,8 bar, wobei die Luft durch einen Spalt mit 0,8 mm - 1,5 mm Spaltweite austritt. Die von der Bahn 1 entfernte überschüssige Streichfarbe wird von einer Absaugung 12 aufgefangen und in die Farbwanne 5 rezirkuliert.In the web running direction behind the transfer roller 3, a counter roller 9 follows at the shortest possible distance, which deflects the web 1 by at least 90 °. In the looped area, an air knife 10 is arranged as a metering device, which contains, as an essential component, a slot nozzle 11 with which an accelerated, sharp air jet is directed onto the web 1 in order to strip off the coating color to the desired coat weight. Such slot nozzles are known and z. B. described in DE-A-30 48 133 and DE-A-30 48 134. At higher web speeds, double air knives are usually used, which have two slot nozzles in a support body. An overpressure of 0.3-0.8 bar prevails in the slot nozzle 11, the air escaping through a gap with a 0.8 mm - 1.5 mm gap width. The excess coating color removed from the web 1 is collected by a suction device 12 and recirculated into the ink tank 5.

Es hat sich gezeigt, daß der Abstand zwischen der Übergabewalze 3 und dem Luftmesser 10 möglicht gering sein muß, um ein Entwässern der Streichfarbe vor der Enddosierung zu vermeiden. Da sowohl die Übergabewalze 3 als auch die Gegenwalze 9 bei großen Arbeitsbreiten (z. B. 8 m) aus Stabilitätsgründen entsprechend groß (bis zu 800 mm Durchmesser) dimensioniert sein müssen, ist konstruktionsbedingt ein gewisser Abstand zwischen der Übergabewalze 3 und der Gegenwalze 9 - gemessen als Abstand zwischen den beiden Drehachsen - erforderlich. Dieser Abstand ist geringer als 1500 mm, bevorzugt geringer als 800 mm.It has been shown that the distance between the transfer roller 3 and the air knife 10 must be as small as possible in order to avoid dewatering of the coating color before the final metering. Since both the transfer roller 3 and the counter roller 9 have to be appropriately large (up to 800 mm in diameter) for large working widths (e.g. 8 m) for reasons of stability, a certain distance between the transfer roller 3 and the counter roller 9 is due to the design. measured as the distance between the two axes of rotation - required. This distance is less than 1500 mm, preferably less than 800 mm.

Beim Beschichten wird die Bahn 1 von der Leitrolle 2 flächig an die Übergabewalze 3 angelegt. Die Übergabewalze 3 schöpft aus der Wanne 5 Streichfarbe im Überschuß, die von dem Rollrakel 7 bis auf das 1,1- bis 2-fache des gewünschten Strichgewichts nach dem Enddosieren mit dem Luftmesser 10 wieder abgestreift wird. Gleichzeitig erzeugt der Rollrakelstab 7 einen sehr gleichmäßigen Film auf der Oberfläche der Übergabewalze 3, der anschließend an die Bahn 1 übergeben wird. Es hat sich gezeigt, daß sich auf der Bahn 1 eine gleichmäßige Schicht mit der geringen Überschußmenge erzeugen läßt, wenn die Spaltweite zwischen der Leitrolle 2 und der Übergabewalze 3 kleiner als 8 mm beträgt, insbesondere im Bereich zwischen 0,5 und 3 mm liegt, und das Verhältnis Bahngeschwindigkeit/Umfangsgeschwindigkeit der Übergabewalze 3 innerhalb eines bestimmten Bereichs liegt. Das Verhältnis der beiden Geschwindigkeiten ist vom spezifischen Durchflußquerschnitt A des Rakelstabes 7 an der Berührungslinie mit der Übergabewalze 3 abhängig. Bevorzugt beträgt das Verhältnis 0,015 x A bis 0,022 x A, wobei für A der spezifische Durchflußquerschnitt in mm² pro m Rakelstablänge eingesetzt wird. Bei drahtumwickelten Rakelstäben mit einem Durchmesser von 1 mm ergibt dies ein Verhältnis von 1,61 - 2,36.During coating, the web 1 is laid flat on the transfer roller 3 by the guide roller 2. The transfer roller 3 draws from the tub 5 coating color in excess, which is stripped from the doctor blade 7 to 1.1 to 2 times the desired coating weight after the final metering with the air knife 10. At the same time, the doctor blade rod 7 produces a very uniform film on the surface of the transfer roller 3, which is then transferred to the web 1. It has been shown that a uniform layer with a small excess amount can be produced on the web 1 if the gap width between the guide roller 2 and the transfer roller 3 is less than 8 mm, in particular in the range between 0.5 and 3 mm, and the ratio of web speed / peripheral speed of the transfer roller 3 is within a certain range. The ratio of the two speeds depends on the specific flow cross section A of the doctor rod 7 at the line of contact with the transfer roller 3. The ratio is preferably 0.015 x A to 0.022 x A, the specific flow cross section in mm 2 per m of doctor blade length being used for A. For wire-wound doctor blades with a diameter of 1 mm, this gives a ratio of 1.61 - 2.36.

Um den von der Bahn 1 umschlungenen Winkel der Übergabewalze 3 einstellen zu können, ist die Drehachse der Leitrolle 2 verstellbar gelagert. Je nach Papiersorte und eingesetzter Streichfarbe beträgt der Umschlingungswinkel an der Übergabewalze 3 zwischen 5° und 30°.In order to be able to set the angle of the transfer roller 3 wrapped around by the web 1, the axis of rotation of the guide roller 2 is adjustable. Depending on the type of paper and the coating color used, the wrap angle on the transfer roller 3 is between 5 ° and 30 °.

Damit beim Enddosieren mittels des Luftmessers 10 keine Probleme, z. B. durch Entwässern der Streichfarbe, auftreten, folgt das Luftmesser 10 mit möglichst geringem Abstand hinter dem Auftragwerk 4. Mit dem Luftmesser 10 wird die geringe Überschußmenge von 10 - 100 % entfernt und so das gewünschte Strichgewicht erreicht.So that no problems during final metering by means of the air knife 10, e.g. B. occur by dewatering the coating color, the air knife 10 follows as close as possible behind the applicator 4. With the air knife 10, the small excess amount of 10 - 100% is removed and the desired coat weight is achieved.

Bevorzugt wird die Übergabewalze 3 gegenläufig zur Laufrichtung der Bahn 1 angetrieben. Die Rakelstange 7 ist daher an der Auslaufseite der Bahn 1 (in Fig. 1 rechts) angeordnet. In Einzelfällen, z. B. im Falle von Lufteinschlüssen in der Streichfarbe, kann die Drehrichtung der Übergabewalze 3 umgekehrt werden, also ein mitläufiger Farbauftrag erfolgen. Dann befindet sich der Rollrakelstab 7' mit seiner Halterung 8' an der Einlaufseite der Übergabewalze 3 (in Fig. 1 gestrichelt gezeichnet). Die beschriebenen Vorteile treten dann allerdings nur noch teilweise auf.The transfer roller 3 is preferably driven in the opposite direction to the running direction of the web 1. The doctor rod 7 is therefore arranged on the outlet side of the web 1 (on the right in FIG. 1). In individual cases, e.g. B. in the case of air inclusions in the coating color, the direction of rotation of the transfer roller 3 can be reversed, that is, a concurrent application of paint. Then the doctor blade rod 7 'with its holder 8' is located on the inlet side of the transfer roller 3 (shown in broken lines in FIG. 1). The advantages described then only occur in part.

Es ist ein wesentlicher Vorteil der erfindungsgemäßen Beschichtungsvorrichtung, daß aufgrund des sehr gleichmäßigen und geringen Überschußauftrages sich sehr hohe Bahngeschwindigkeiten verwirklichen lassen. Insbesondere beim Beschichten von Karton lassen sich Produktionsgeschwindigkeiten oberhalb 500 m/min auch bei großen Arbeitsbreiten (z. B. 8 m) erreichen.It is an essential advantage of the coating device according to the invention that very high web speeds can be achieved due to the very uniform and low excess application. In particular when coating cardboard, production speeds above 500 m / min can be achieved even with large working widths (e.g. 8 m).

Claims (5)

  1. Apparatus for coating a material web (1), especially a paper or cardboard web,
    - with an applicator (4) having a driven transfer roller (3), round which the web is partially looped, for applying coating material in excess to the web (1),
    - with a revolving doctor bar (7) having circumferential elevations and depressions for evening out the excess application,
    - with an air knife (10) as a final metering device, having a partially looped-round mating roller (9) and a slit nozzle (11) arranged in the looped-round region,
    - and with a guide roll (2) for guiding the web (1) onto the transfer roller (3),
    characterized in that
    - the revolving doctor bar (7), being elastically mounted, can be pressed on the transfer roller (3),
    - the distance between the transfer roller (3) and the mating roller (9) is less than 1500 mm, preferably less than 800 mm, and
    - the distance between the guide roll (2) and the transfer roller (3) is less than 8 mm, preferably between 0.5 mm and 3 mm.
  2. Apparatus according to Claim 1, characterized in that the web (1) is looped round the transfer roller (3) at an angle between 5° and 30°.
  3. Apparatus according to Claim 1 or 2, characterized in that the slit nozzle (11) of the air knife (10) has a gap width of 0.8 mm - 1.5 mm.
  4. Apparatus according to one of Claims 1 to 3, characterized in that the revolving doctor bar (7) is wrapped with a wire having a diameter of 0.6 - 1 mm or has elevations and depressions which produce a through-flow cross-section corresponding to this wire diameter.
  5. Apparatus according to one of Claims 1 to 4, characterized in that the ratio of the web speed to the circumferential speed of the transfer roller (3) is between 0.015 × A and 0.022 × A, the specific throughflow cross-section of the doctor bar (7) along the contact line with the transfer roller (3) in mm² per m of doctor-bar length being used for A.
EP91906670A 1990-05-07 1991-03-27 Process for coating a web of material, especially paper or cardboard Expired - Lifetime EP0481024B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4014463 1990-05-07
DE4014463A DE4014463A1 (en) 1990-05-07 1990-05-07 DEVICE FOR COATING A MATERIAL SHEET, IN PARTICULAR A PAPER OR CARDBOARD SHEET
PCT/EP1991/000596 WO1991017309A1 (en) 1990-05-07 1991-03-27 Process for coating a web of material, especially paper or cardboard

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Publication Number Publication Date
EP0481024A1 EP0481024A1 (en) 1992-04-22
EP0481024B1 true EP0481024B1 (en) 1995-04-19

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EP91906670A Expired - Lifetime EP0481024B1 (en) 1990-05-07 1991-03-27 Process for coating a web of material, especially paper or cardboard

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US (1) US5368893A (en)
EP (1) EP0481024B1 (en)
AT (1) ATE121476T1 (en)
BR (1) BR9105743A (en)
DE (2) DE4014463A1 (en)
FI (1) FI97410C (en)
WO (1) WO1991017309A1 (en)

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Also Published As

Publication number Publication date
WO1991017309A1 (en) 1991-11-14
EP0481024A1 (en) 1992-04-22
ATE121476T1 (en) 1995-05-15
DE59105249D1 (en) 1995-05-24
FI97410C (en) 1996-12-10
BR9105743A (en) 1992-05-19
FI920039A0 (en) 1992-01-03
DE4014463A1 (en) 1991-11-14
US5368893A (en) 1994-11-29
FI97410B (en) 1996-08-30

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