EP0152921B1 - Coating device for sheetlike materials - Google Patents

Coating device for sheetlike materials Download PDF

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Publication number
EP0152921B1
EP0152921B1 EP85101631A EP85101631A EP0152921B1 EP 0152921 B1 EP0152921 B1 EP 0152921B1 EP 85101631 A EP85101631 A EP 85101631A EP 85101631 A EP85101631 A EP 85101631A EP 0152921 B1 EP0152921 B1 EP 0152921B1
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EP
European Patent Office
Prior art keywords
nozzle
pump
slot
arrangement
coating
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EP85101631A
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German (de)
French (fr)
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EP0152921A3 (en
EP0152921A2 (en
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John Mladota
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Priority to AT85101631T priority Critical patent/ATE46633T1/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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material

Definitions

  • the invention relates to a device for applying a thin layer of a coating material to a web of material running over a counter-pressure roller, with a nozzle slot with a fixed inlet nozzle lip and a slot nozzle device designed as a rotatable doctor rod, a storage container for the coating material and a supply channel between the Storage container and the nozzle slot, which has a sufficient width to continuously supply the coating material over the coating width to the nozzle slot and apply it there.
  • a device has become known, for example, from DE-C-3100101.
  • US-A-4 333 420 discloses a device for applying one or more thin strips of glue to one or more webs of material running over a counter roller.
  • Each thin strip of glue is applied by means of a dispensing nozzle in its own housing, in which a conventional gear pump with a driven and a rotating pump gear are fixedly arranged.
  • Each housing can be moved transversely and perpendicular to the material web, the gear pumps are driven together by means of a rod with a non-circular cross section proportional to the material web speed, the rod can be easily removed from it to stop each gear pump.
  • US-A-2474254 has disclosed a device for impregnating material webs with liquids, which has a gear pump arrangement extending over the material web width in a feed channel between a storage container and a slot.
  • the gear pump arrangement has a plurality of pump sections, each with two pump gears, which sit on two continuous shafts, the two shafts being mounted in short spacers between the pump gears.
  • the invention has for its object to provide a coating device of the type described above, with which a sufficient, flawless and uniform supply of coating material is ensured to the nozzle slot over the entire desired coating width. At the same time, both a simple adaptation of the coating device to different coating widths and a quick and easy cleaning of the slot nozzle arrangement when converting to different coating materials are to be ensured.
  • Such an arrangement makes it possible to provide a sufficient amount of coating material uniformly distributed over the coating width at the nozzle slot, the number of pump sections being selected in accordance with the desired coating width and being able to be changed in a simple and user-friendly manner.
  • a simple, quick and thorough cleaning of the slot nozzle arrangement can be carried out when changing the coating material. The latter is particularly important if, due to the driving of small batches, it has to be converted relatively frequently.
  • the driven pump gearwheels are advantageously connected to one another in a drive-proof manner in the region of the spacers by way of axially engaging axial connecting pieces.
  • the driven pump gearwheels can thus be driven by a single drive motor.
  • the spacers are expediently designed as coal stores.
  • the axial length of the pump gears is advantageously about twice the axial length of the spacers. This results in a completely uniform distribution of the coating material along the nozzle slot.
  • the pump gearwheels are advantageously driven at about 10 to 12 rpm in current and customary coating processes.
  • heating or cooling channels extending over the coating width can advantageously be provided in the area of the feed channel and the gear pump arrangement, which ensure good heat transfer within the slot nozzle device.
  • the walls of the storage container are expediently heated, in particular for the processing of coating hotmelts.
  • a rod-shaped round slide valve closure which closes the supply channel is advantageously arranged, the closing rod of the round slide valve closure being expediently mounted under the supply channel near the nozzle lips.
  • the device according to the invention for applying a thin layer of a coating material shown in FIGS. 1 and 2 in a preferred embodiment has a counter-pressure roller 1, which is covered with rubber or hard rubber. A material web 2 to be coated is guided over the counter-pressure roller 1 in the direction of arrow A.
  • a slot nozzle device 3 with a fixed inlet and outlet nozzle lip of the nozzle slot 4 is provided on one side of the counter-pressure roller 1.
  • the incoming nozzle lip 5 of the nozzle slot 4 is fixed, the outgoing nozzle lip 6 of the nozzle slot 4 is designed as a rotatable doctor rod 6.
  • Material webs to be coated are, for example, paper webs, plastic films, metal foils, fabric webs and combinations of such material webs.
  • the material web can be an aluminum foil with a thickness of 0.008 mm, 0.012 mm, 0.02 mm and up to 0.12 mm.
  • Smooth, coated or creped papers from 40 to 120 g / m 2 are suitable as paper webs, plastic films from 40 to 120 m ⁇ thick, biaxially oriented, so-called oriented polypropylene films from 30 to 120 rn ⁇ thick and polyester films in the same thickness range.
  • hard PVC films and monomeric as well as polymer-softened PVC films can be processed as material webs, and, for example, carpet laying tapes and dressing materials as fabric webs.
  • Coating materials include paraffins and microcrystalline waxes with processing temperatures between 75 ° C and 100 ° C with application quantities between 4 and 40 g / m 2. Also possible are coating hotmelts consisting of ethyl vinyl acetate copolymers mixed with paraffin and resins at processing temperatures between 140 ° C and 190 ° C for the surface finishing of packaging material. Hot melt pressure sensitive adhesives used have processing temperatures between 140 ° C and 190 ° C with application quantities between 12 and 40 g / m 2 , while thermoset adhesives are processed at temperatures from 70 ° C to 80 ° C and application quantities from 40 g / m 2 . Polyurethane glue, consisting of two components, is mixed shortly before coating.
  • Further coating materials are aqueous emulsions and dispersions as a PVC coating at room temperature.
  • Acrylic adhesives as aqueous dispersions with coating also at room temperature various starch adhesives that are processed at temperatures from 70 ° C to 90 ° C, adhesives and coating compositions that are dissolved in organic solvents and processed at room temperature and finally cold glue based on PVC Polyvinyl alcohol.
  • Coating material 7 is located in a storage container 8, which can be heated by heating pipes 9. Through a feed channel 10 running over the greatest coating width, the coating material 7 is fed under the force of gravity to a gear pump arrangement 12 also running over the coating width, and from there under the pumping action of the gear pump arrangement 12 through a further feed channel 11 running over the greatest coating width is fed to the nozzle slot 4.
  • the gear pump arrangement 12 has a plurality of pump sections 13, each with a driven pump gear 14 and a rotating pump gear 15. Spacers 16, which support the pump gear wheels 13, 14, are arranged between the pump sections 13. Both the pump sections 13 and the spacers 16 are arranged in the slot nozzle device 3 so that they can be easily removed in order to convert and clean the slot nozzle arrangement. An adaptation to different coating widths takes place by inserting a corresponding number of pump sections 13 and spacers 16 into the slot nozzle arrangement.
  • the pump gearwheels 14, 15 are mounted in the spacers 16 via axle stubs 17 on both sides. Furthermore, the driven pump gearwheels 14 are connected to one another in a drive-proof manner in the area of the spacers 16 by way of axially engaging axial connecting pieces 18, it being possible for all pump sections 13 to be driven jointly from the side 19 of the gear pump arrangement 12, preferably at about 10 to 12 rpm.
  • the spacers 16 are preferably designed as coal bearings.
  • the slot nozzle device 3 is designed such that it can be folded open with respect to a plane running through the central longitudinal plane 20 between the pump gear wheels 14, 15, as a result of which the conversion and cleaning of the slot nozzle device 3 can be carried out in a particularly simple and user-friendly manner.
  • the axial length of the pump gearwheels 14, 15 is advantageously approximately twice the axial length of the spacers 16, which in any case ensures a uniform distribution of the coating material 7 along the length of the nozzle slot 4.
  • heating or cooling ducts 21 can expediently be provided over the coating width in order to ensure good heat transfer.
  • a closing rod 22 of a rod-shaped circular slide valve closing the feed channel 11 is arranged under the feed channel 11 in the vicinity of the nozzle lips 5, 6.
  • This circular slide valve closure is not only advantageous when retrofitting and cleaning the slot nozzle device 3, but also ensures that a coating without coating can be applied with the slot nozzle device described.

Abstract

A device for the application of a thin layer of a coating material (7) onto a material web (2) passing across a backing roller (1) comprises a slot nozzle arrangement (3) having a nozzle slot (4). In order to ensure uniform and sufficient delivery of coating material (7) across the length of the nozzle slot (4), the coating material (7) is delivered from a supply container (8) through a delivery channel (10, 11) extending across the coating width to the nozzle slot (4) of the slot nozzle arrangement (3) and in the delivery channel (10, 11) of the slot nozzle arrangement (3) a gear pump arrangement (12) is provided which has a plurality of rectilinearly aligned pump sections (13), each having two intermeshed pump gears (14, 15), the arrangement extending over the coating width and arranged with the distance pieces mounting the pump gears (14, 15) between the pump sections (13) to be easily removable. The distance pieces (16) are formed as carbon bearings and the parts are channeled for heating and cooling.

Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Aufbringen einer dünnen Schicht eines Beschichtungsmaterials auf eine über eine Gegendruckwalze laufende Materialbahn, mit einer einen Düsenschlitz mit feststehender einlaufender Düsenlippe und als drehbarer Rakelstab ausgebildeter ablaufender Düsenlippe aufweisenden Schlitzdüseneinrichtung, einem Vorratsbehälter für das Beschichtungsmaterial und einem Zufuhrkanal zwischen dem Vorratsbehälter und dem Düsenschlitz, der eine genügende Breite aufweist, um das Beschichtungsmaterial kontinuierlich über die Beschichtungsbreite dem Düsenschlitz zuzuführen und dort aufzubringen. Eine derartige Vorrichtung ist beispielsweise durch die DE-C-3100101 bekanntgeworden.The invention relates to a device for applying a thin layer of a coating material to a web of material running over a counter-pressure roller, with a nozzle slot with a fixed inlet nozzle lip and a slot nozzle device designed as a rotatable doctor rod, a storage container for the coating material and a supply channel between the Storage container and the nozzle slot, which has a sufficient width to continuously supply the coating material over the coating width to the nozzle slot and apply it there. Such a device has become known, for example, from DE-C-3100101.

Bei derartigen Beschichtungsvorrichtungen kommt es darauf an, daß das Beschichtungsmaterial über große Breiten von mehreren Metern gleichmäßig über die Breite aufgetragen wird und dementsprechend für eine gleichmäßige und ausreichende Zufuhr von Beschichtungsmaterial entlang des Düsenschlitzes zu sorgen ist.In such coating devices, it is important that the coating material is applied uniformly across the width over large widths of several meters and, accordingly, that a uniform and sufficient supply of coating material is to be provided along the nozzle slot.

Durch die US-A-4 333 420 ist eine Vorrichtung zum Aufbringen von einem oder mehreren dünnen Streifen Leim auf eine oder mehrere, über eine Gegenwalze laufende Materialbahn bekannt geworden. Jeder dünne Leimstreifen wird mittels einer Abgabedüse in einem eigenen Gehäuse aufgebracht, in dem jeweils eine konventionelle Zahnradpumpe mit einem angetriebenen und einem mitlaufenden Pumpenzahnrad fest angeordnet sind. Jedes Gehäuse ist quer und senkrecht zur Materialbahn verschiebbar, die Zahnradpumpen sind mittels eines Stabes mit nichtkreisförmigern Querschnitt proportional der Materialbahngeschwindigkeit gemeinsam angetrieben, der Stab ist zum Anhalten jeder Zahnradpumpe leicht von dieser entfernbar.US-A-4 333 420 discloses a device for applying one or more thin strips of glue to one or more webs of material running over a counter roller. Each thin strip of glue is applied by means of a dispensing nozzle in its own housing, in which a conventional gear pump with a driven and a rotating pump gear are fixedly arranged. Each housing can be moved transversely and perpendicular to the material web, the gear pumps are driven together by means of a rod with a non-circular cross section proportional to the material web speed, the rod can be easily removed from it to stop each gear pump.

Durch die US-A-2474254 ist schließlich eine Vorrichtung zum Imprägnieren von Materialbahnen mit Flüssigkeiten bekannt geworden, die in einem Zufuhrkanal zwischen einem Vorratsbehälter und einem Schlitz eine sich über die Materialbahnbreite verlaufende Zahnradpumpenanordnung aufweist. Die Zahnradpumpenanordnung hat mehrere Pumpenabschnitte mit je zwei Pumpenzahnrädern, die auf zwei durchgehenden Wellen sitzen, wobei die zwei Wellen in kurzen Abstandsstücken zwischen den Pumpenzahnrädern gelagert sind.Finally, US-A-2474254 has disclosed a device for impregnating material webs with liquids, which has a gear pump arrangement extending over the material web width in a feed channel between a storage container and a slot. The gear pump arrangement has a plurality of pump sections, each with two pump gears, which sit on two continuous shafts, the two shafts being mounted in short spacers between the pump gears.

Der Erfindung liegt die Aufgabe zugrunde, eine Beschichtungsvorrichtung der eingangs beschriebenen Art zu schaffen, mit der eine ausreichende, einwandfreie und über die gesamte gewünschte Beschichtungsbreite gleichmäßige Zufuhr von Beschichtungsmaterial zu dem Düsenschlitz gewährleistet ist. Gleichzeitig soll sowohl eine einfache Anpassung der Beschichtungsvorrichtung an unterschiedliche Beschichtungsbreiten als auch ein schnelles und einfaches Reinigen der Schlitzdüsenanordnung beim Umrüsten auf unterschiedliche Beschichtungsmaterialien sichergestellt werden.The invention has for its object to provide a coating device of the type described above, with which a sufficient, flawless and uniform supply of coating material is ensured to the nozzle slot over the entire desired coating width. At the same time, both a simple adaptation of the coating device to different coating widths and a quick and easy cleaning of the slot nozzle arrangement when converting to different coating materials are to be ensured.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst,

  • - daß die Vorrichtung in dem Zufuhrkanal eine über die Beschichtungsbreite verlaufende Zahnradpumpenanordnung aufweist,
  • - daß die Zahnradpumpenanordnung mehrere Pumpenabschnitte mit je zwei Pumpenzahnrädern und kurze, die Pumpenzahnräder mit Abstand haltende und lagernde Abstandsstücke zwischen den Pumpenabschnitten aufweist,
  • - daß der Zufuhrkanal zwischen der Zahnradpumpenanordnung und dem Düsenschlitz über die Beschichtungsbreite ununterbrochen und mit einer Länge ausgebildet ist, die ein Mehrfaches seiner Höhe beträgt,
  • - daß die Pumpenzahnräder mit beidseitigen Achsstummeln leicht lösbar in den Abstandsstükken gelagert sind,
  • - daß die Pumpenzahnräder und die zugehörigen Abstandsstücke einzeln leicht entfernbar ausgebildet sind,
  • - und daß die Schlitzdüseneinrichtung zwei Teile aufweist, die um die Pumpenzahnräder herum öffenbar sind.
According to the invention, this object is achieved by
  • that the device in the feed channel has a gear pump arrangement running across the coating width,
  • that the gear pump arrangement has a plurality of pump sections, each with two pump gears, and short spacers between the pump sections, which keep the pump gears at a distance and support them,
  • that the feed channel between the gear pump arrangement and the nozzle slot is continuous over the coating width and of a length which is a multiple of its height,
  • - That the pump gears with stub axles on both sides are easily detachably mounted in the spacers,
  • that the pump gears and the associated spacers are individually easily removable,
  • - And that the slot nozzle device has two parts that can be opened around the pump gears.

Eine derartige Anordnung ermöglicht es, an dem Düsenschlitz eine gleichmäßig über die Beschichtungsbreite verteilte ausreichende Menge an Beschichtungsmaterial zur Verfügung zu stellen, wobei die Anzahl der Pumpenabschnitte entsprechend der gewünschten Beschichtungsbreite gewählt wird und auf einfache und betriebsfreundliche Weise verändert werden kann. Außerdem läßt sich eine einfache, schnelle und gründliche Reinigung der Schlitzdüsenanordnung bei der Änderung von Beschichtungsmaterial vornehmen. Letzteres ist besonders dann von Bedeutung, wenn infolge des Fahrens kleiner Chargen relativ häufig umgerüstet werden muß.Such an arrangement makes it possible to provide a sufficient amount of coating material uniformly distributed over the coating width at the nozzle slot, the number of pump sections being selected in accordance with the desired coating width and being able to be changed in a simple and user-friendly manner. In addition, a simple, quick and thorough cleaning of the slot nozzle arrangement can be carried out when changing the coating material. The latter is particularly important if, due to the driving of small batches, it has to be converted relatively frequently.

Vorteilhaft sind die angetriebenen Pumpenzahnräder über formschlüssig in sie eingreifende Achsverbindungsstücke im Bereich der Abstandsstücke miteinander antriebsfest verbunden. Der Antrieb der angetriebenen Pumpenzahnräder kann damit über einen einzigen Antriebsmotor erfolgen.The driven pump gearwheels are advantageously connected to one another in a drive-proof manner in the region of the spacers by way of axially engaging axial connecting pieces. The driven pump gearwheels can thus be driven by a single drive motor.

Die Abstandsstücke sind zweckmäßig als Kohlelager ausgebildet.The spacers are expediently designed as coal stores.

Die axiale Länge der Pumpenzahnräder beträgt zweckmäßig etwa das zweifache der axialen Länge der Abstandsstücke. Hiermit ergibt sich eine völlig gleichmäßige Verteilung des Beschichtungsmaterials entlang des Düsenschlitzes.The axial length of the pump gears is advantageously about twice the axial length of the spacers. This results in a completely uniform distribution of the coating material along the nozzle slot.

Die Pumpenzahnräder werden bei gängigen und üblichen Beschichtungsvorgängen vorteilhaft mit etwa 10 bis 12 U/min angetrieben.The pump gearwheels are advantageously driven at about 10 to 12 rpm in current and customary coating processes.

Weiter können bei der erfindungsgemäßen Schlitzdüsenanordnung vorteilhaft im Bereich des Zufuhrkanals und der Zahnradpumpenanordnung über die Beschichtungsbreite verlaufende Heiz-oder Kühlkanäle vorgesehen sein, die einen guten Wärmeübergang innerhalb der Schlitzdüseneinrichtung sicherstellen.Furthermore, in the slot nozzle arrangement according to the invention, heating or cooling channels extending over the coating width can advantageously be provided in the area of the feed channel and the gear pump arrangement, which ensure good heat transfer within the slot nozzle device.

Die Wandungen des Vorratsbehälters sind insbesondere für die Verarbeitung von Beschichtungshotmelts zweckmäßig beheizt.The walls of the storage container are expediently heated, in particular for the processing of coating hotmelts.

Weiter ist vorteilhaft zwischen der Zahnradpumpenanordnung und den Düsenlippen der Schlitzdüseneinrichtung ein den Zufuhrkanal verschließender, stangenförmiger Rundschieberverschluß angeordnet, wobei die Schließstange des Rundschieberverschlusses zweckmäßig unter dem Zufuhrkanal in der Nähe der Düsenlippen gelagert ist. Hiermit ergibt sich nicht nur eine erheblich gesteigerte Bedienungsfreundlichkeit beim Umrüsten und Reinigen der Schlitzdüseneinrichtung, sondern auch die Möglichkeit einer verbesserten ansatzfreien Beschichtung der Materialbahn.Furthermore, between the gear pump arrangement and the nozzle lips of the slot nozzle device, a rod-shaped round slide valve closure which closes the supply channel is advantageously arranged, the closing rod of the round slide valve closure being expediently mounted under the supply channel near the nozzle lips. This not only results in a significantly increased user friendliness when converting and cleaning the slot nozzle device, but also the possibility of an improved, coating-free coating of the material web.

Die Erfindung ist im folgenden an einem Ausführungsbeispiel anhand der Zeichnungen näher erläutert. In den Zeichnungen zeigt

  • Fig. 1 eine Seitenschnittansicht der Schlitzdüseneinrichtung einer Beschichtungsvorrichtung, gemäß der Erfindung, und
  • Fig. 2 eine Längsschnittansicht entlang der Linie 11-11 durch die Pumpenanordnung der Schlitzdüseneinrichtung in Fig. 1.
The invention is explained below using an exemplary embodiment with reference to the drawings. In the drawings shows
  • Fig. 1 is a side sectional view of the slot nozzle device of a coating device, according to the invention, and
  • FIG. 2 shows a longitudinal sectional view along the line 11-11 through the pump arrangement of the slot nozzle device in FIG. 1.

Die in den Fig. 1 und 2 an einem bevorzugten Ausführungsbeispiel dargestellte erfindungsgemäße Vorrichtung zum Aufbringen einer dünnen Schicht eines Beschichtungsmaterials weist eine Gegendruckwalze 1 auf, welche mit Kautschuk oder Hartgummi bezogen ist. Über die Gegendruckwalze 1 wird in Richtung des Pfeiles A eine zu beschichtende Materialbahn 2 geführt.The device according to the invention for applying a thin layer of a coating material shown in FIGS. 1 and 2 in a preferred embodiment has a counter-pressure roller 1, which is covered with rubber or hard rubber. A material web 2 to be coated is guided over the counter-pressure roller 1 in the direction of arrow A.

Auf einer Seite der Gegendruckwalze 1 ist eine Schlitzdüseneinrichtung 3 mit feststehender einlaufender und ablaufender Düsenlippe des Düsenschlitzes 4 vorgesehen. Die einlaufende Düsenlippe 5 des Düsenschlitzes 4 ist feststehend, die ablaufende Düsenlippe 6 des Düsenschlitzes 4 als drehbarer Rakelstab 6 ausgebildet.On one side of the counter-pressure roller 1, a slot nozzle device 3 with a fixed inlet and outlet nozzle lip of the nozzle slot 4 is provided. The incoming nozzle lip 5 of the nozzle slot 4 is fixed, the outgoing nozzle lip 6 of the nozzle slot 4 is designed as a rotatable doctor rod 6.

Zu beschichtende Materialbahnen sind beispielsweise Papierbahnen, Kunststoffolien, Metallfolien, Gewebebahnen sowie Kombinationen derartiger Materialbahnen. So kann die Materialbahn eine Aluminiumfolie mit 0,008 mm, 0,012 mm, 0,02 mm und bis zu 0,12 mm Dicke sein. Als Papierbahn kommen glatte, gestrichene oder gekreppte Papiere von 40 bis 120 g/m2 in Frage, als Kunststoffolien Polyäthylenfolien von 40 bis 120 mµ Dicke, biaxial gereckte, sogenannte orientierte Polypropylenfolien von 30 bis 120 rnµ Dicke und Polyesterfolien im gleichen Dickenbereich. Weiter können als Materialbahnen Hart-PVC-Folien und monomer sowie polymer weichgemachte PVC-Folien verarbeitet werden, und als Gewebebahnen beispielsweise Teppichverlegebänder und Verbandmaterialien.Material webs to be coated are, for example, paper webs, plastic films, metal foils, fabric webs and combinations of such material webs. The material web can be an aluminum foil with a thickness of 0.008 mm, 0.012 mm, 0.02 mm and up to 0.12 mm. Smooth, coated or creped papers from 40 to 120 g / m 2 are suitable as paper webs, plastic films from 40 to 120 mµ thick, biaxially oriented, so-called oriented polypropylene films from 30 to 120 rnµ thick and polyester films in the same thickness range. Furthermore, hard PVC films and monomeric as well as polymer-softened PVC films can be processed as material webs, and, for example, carpet laying tapes and dressing materials as fabric webs.

Beschichtungsmaterialien sind unter anderem Paraffine und mikrokristalline Wachse mit Verarbeitungstemperaturen zwischen 75°C und 100°C bei Auftragsmengen zwischen 4 und 40 g/m2. Weiter kommen in Frage Beschichtungshotmelts, bestehend aus Äthylvinylacetat-Copolymeren, gemischt mit Paraffin und Harzen, bei Verarbeitungstemperaturen zwischen 140 °C und 190 °C für die Oberflächenveredelung von Verpackungsmaterial. Verwendete Schmelzhaftkleber haben Verarbeitungstemperaturen zwischen 140°C und 190°C bei Auftragsmengen zwischen 12 und 40 g/ m2, während Thermoset-Kleber bei Temperaturen von 70 °C bis 80 °C und Auftragsmenge ab 40 g/m2 verarbeitet werden. Polyurethankleber, bestehend aus zwei Komponenten, werden kurz vor der Beschichtung gemischt.Coating materials include paraffins and microcrystalline waxes with processing temperatures between 75 ° C and 100 ° C with application quantities between 4 and 40 g / m 2. Also possible are coating hotmelts consisting of ethyl vinyl acetate copolymers mixed with paraffin and resins at processing temperatures between 140 ° C and 190 ° C for the surface finishing of packaging material. Hot melt pressure sensitive adhesives used have processing temperatures between 140 ° C and 190 ° C with application quantities between 12 and 40 g / m 2 , while thermoset adhesives are processed at temperatures from 70 ° C to 80 ° C and application quantities from 40 g / m 2 . Polyurethane glue, consisting of two components, is mixed shortly before coating.

Weitere Beschichtungsmaterialien sind wäßrige Emulsionen und Dispersionen als PVC-Beschichtung bei Raumtemperatur. Acrylatkleber als wäßrige Dispersionen mit Beschichtung ebenfalls bei Raumtemperatur, verschiedene Stärkekleber, die bei Temperaturen von 70°C bis 90°C verarbeitet werden, Klebstoffe und Beschichtungsmassen, die in organischen Lösungsmitteln gelöst sind und bei Raumtemperatur verarbeitet werden und schließlich Kaltleime PVC auf der Basis von Polyvinylalkohol.Further coating materials are aqueous emulsions and dispersions as a PVC coating at room temperature. Acrylic adhesives as aqueous dispersions with coating also at room temperature, various starch adhesives that are processed at temperatures from 70 ° C to 90 ° C, adhesives and coating compositions that are dissolved in organic solvents and processed at room temperature and finally cold glue based on PVC Polyvinyl alcohol.

Beschichtungsmaterial 7 befindet sich in einem Vorratsbehälter 8, der durch Heizrohre 9 beheizt werden kann. Durch einen über die größte Beschichtungsbreite verlaufenden Zufuhrkanal 10 wird das Beschichtungsmaterial 7 unter Schwerkraftwirkung einer ebenfalls über die Beschichtungsbreite verlaufenden Zahnradpumpenanordnung 12 zugeführt und von dort unter der Pumpwirkung der Zahnradpumpenanordnung 12 durch einen über die größte Beschichtungsbreite verlaufenden weiteren Zufuhrkanal 11 dem Düsenschlitz 4 zugeführt.Coating material 7 is located in a storage container 8, which can be heated by heating pipes 9. Through a feed channel 10 running over the greatest coating width, the coating material 7 is fed under the force of gravity to a gear pump arrangement 12 also running over the coating width, and from there under the pumping action of the gear pump arrangement 12 through a further feed channel 11 running over the greatest coating width is fed to the nozzle slot 4.

Die Zahnradpumpenanordnung 12 weist mehrere Pumpenabschnitte 13 mit je einem angetriebenen Pumpenzahnrad 14 und mitlaufenden Pumpenzahnrad 15 auf. Zwischen den Pumpenabschnitten 13 sind Abstandsstücke 16, die die Pumpenzahnräder 13, 14 lagern, angeordnet. Sowohl die Pumpenabschnitte 13 als auch die Abstandsstücke 16 sind zum Umrüsten und Reinigen der Schlitzdüsenanordnung leicht entfernbar in der Schlitzdüseneinrichtung 3 angeordnet. Eine Anpassung an unterschiedliche Beschichtungsbreiten erfolgt durch Einsetzen einer entsprechenden Anzahl von Pumpenabschnitten 13 und Abstandsstücken 16 in die Schlitzdüsenanordnung.The gear pump arrangement 12 has a plurality of pump sections 13, each with a driven pump gear 14 and a rotating pump gear 15. Spacers 16, which support the pump gear wheels 13, 14, are arranged between the pump sections 13. Both the pump sections 13 and the spacers 16 are arranged in the slot nozzle device 3 so that they can be easily removed in order to convert and clean the slot nozzle arrangement. An adaptation to different coating widths takes place by inserting a corresponding number of pump sections 13 and spacers 16 into the slot nozzle arrangement.

Die Pumpenzahnräder 14,15 sind über beidseitige Achsstummel 17 in den Abstandsstücken 16 gelagert. Weiter sind die angetriebenen Pumpenzahnräder 14 über formschlüssig in sie eingreifende Achsverbindungsstücke 18 im Bereich der Abstandsstücke 16 miteinander antriebsfest verbunden, wobei der Antrieb sämtlicher Pumpenabschnitte 13 gemeinsam von der Seite 19 der Zahnradpumpenanordnung 12 vorzugsweise mit etwa 10 bis 12 U/min erfolgen kann. Die Abstandsstücke 16 sind vorzugsweise als Kohlelager ausgebildet.The pump gearwheels 14, 15 are mounted in the spacers 16 via axle stubs 17 on both sides. Furthermore, the driven pump gearwheels 14 are connected to one another in a drive-proof manner in the area of the spacers 16 by way of axially engaging axial connecting pieces 18, it being possible for all pump sections 13 to be driven jointly from the side 19 of the gear pump arrangement 12, preferably at about 10 to 12 rpm. The spacers 16 are preferably designed as coal bearings.

Die Schlitzdüseneinrichtung 3 ist bezüglich einer durch die Mittellängsebene 20 zwischen den Pumpenzahnrädern 14, 15 verlaufenden Ebene aufklappbar ausgebildet, wodurch das Umrüsten und Reinigen der Schlitzdüseneinrichtung 3 besonders einfach und betriebsfreundlich durchzuführen ist.The slot nozzle device 3 is designed such that it can be folded open with respect to a plane running through the central longitudinal plane 20 between the pump gear wheels 14, 15, as a result of which the conversion and cleaning of the slot nozzle device 3 can be carried out in a particularly simple and user-friendly manner.

Die axiale Länge der Pumpenzahnräder 14, 15 beträgt vorteilhaft etwa das zweifache der axialen Länge der Abstandsstücke 16, wodurch in jedem Falle eine gleichmäßige Verteilung des Beschichtungsmaterials 7 entlang der Länge des Düsenschlitzes 4 gewährleistet ist.The axial length of the pump gearwheels 14, 15 is advantageously approximately twice the axial length of the spacers 16, which in any case ensures a uniform distribution of the coating material 7 along the length of the nozzle slot 4.

Im Bereich des Zufuhrkanals 10, 11 und der Zahnradpumpenanordnung 12 können zweckmäßig über die Beschichtungsbreite verlaufende Heiz- oder Kühlkanäle 21 vorgesehen sein, um einen guten Wärmeübergang zu gewährleisten.In the area of the supply duct 10, 11 and the gear pump arrangement 12, heating or cooling ducts 21 can expediently be provided over the coating width in order to ensure good heat transfer.

Zwischen der Zahnradpumpenanordnung 12 und den Düsenlippen 5, 6 ist unter dem Zufuhrkanal 11 in der Nähe der Düsenlippen 5, 6 eine Schließstange 22 eines den Zufuhrkanal 11 verschließenden, stangenförmigen Rundschieberverschlusses angeordnet. Dieser Rundschieberverschluß ist nicht nur vorteilhaft bei der Umrüstung und Reinigung der Schlitzdüseneinrichtung 3, sondern stellt auch sicher, daß mit der beschriebenen Schlitzdüseneinrichtung eine ansatzfreie Beschichtung aufgebracht werden kann.Between the gear pump arrangement 12 and the nozzle lips 5, 6, a closing rod 22 of a rod-shaped circular slide valve closing the feed channel 11 is arranged under the feed channel 11 in the vicinity of the nozzle lips 5, 6. This circular slide valve closure is not only advantageous when retrofitting and cleaning the slot nozzle device 3, but also ensures that a coating without coating can be applied with the slot nozzle device described.

Claims (9)

1. A device for applying a thin coating of a coating material (7) onto a material web (2) passing across a backing roller (1), comprising a slot nozzle arrangement (3) having a nozzle slot (4) with a fixed lead-on nozzle lip (5) and a lead-off nozzle lip (6) in the form of a rotatable doctor member, a supply container (8) for the coating material (7), and a delivery channel (10, 11) between the supply container (8) and the nozzle slot (4), the delivery channel being of sufficient width to allow continuous delivery of the coating material (7) to the nozzle (4) over the coating width and for application there, characterised in that
-the device has a gear pump arrangement (12) located in the delivery channel (10, 11) and extending across the coating width,
-the gear pump arrangement (12) has a plurality of pump sections (13) each having two pump gears (14, 15) and short spacing members (16) arranged between the pump sections (13) to support and space the pump gears (14, 15),
- the delivery channel (11) between the gear pump arrangement (12) and the nozzle slot (4) is arranged to extend over the coating width without interruption and at a length which is a multiple of its height,
-the pump gears (14, 15) with the axle ends (17) on both sides of the gears are mounted in the spacing members (16) so as to be easily removable,
- the pump gears (14, 15) and the associated spacing members (16) are constructed so as to be easily removable individually,
- and the slot nozzle arrangement (3) has two parts which can be opened up around the pump gears.
2. Device according to claim 1, characterised in that the driven pump gears (14) are connected together axially in the region of the spacing members (16) via axle connecting pieces (18) engaging the gears in a firm locking manner.
3. Device according to claim 1 or 2, characterised in that the spacing members (16) are carbon bearings.
4. Device according to one of the claims 1 to 3, characterised in that the axial length of the pump gears (14, 15) is equal to approximately twice the axial length of the spacing members (16).
5. Device according to one of the claims 1 to 4, characterised in that the pump gears (14, 15) are driven at approximately 10 to 12 rpm.
6. Device according to one of the claims 1 to 5, characterised in that heating and cooling channels (21) extending across the width of the delivery channel are provided in the region of the delivery channel (10, 11) and the gear pump arrangement (12).
7. Device according to one of the claims 1 to 6, characterised in that the walls of the supply container (8) are heated.
8. Device according to one of the claims 1 to 7, characterised in that between the gear pump arrangement (12) and the nozzle lips (5, 6) of the slot nozzle arrangement (3) there is arranged a rod- like circular gate valve for closing the delivery channel (11).
9. Device according to claim 8, characterised in that the closure rod (22) of the circular gate valve is mounted beneath the delivery channel (11) in the vicinity of the nozzle lips (5, 6).
EP85101631A 1984-02-20 1985-02-14 Coating device for sheetlike materials Expired EP0152921B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85101631T ATE46633T1 (en) 1984-02-20 1985-02-14 COATING DEVICE FOR MATERIAL WEBS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3406099 1984-02-20
DE19843406099 DE3406099A1 (en) 1984-02-20 1984-02-20 COATING DEVICE FOR MATERIAL RAILS

Publications (3)

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EP0152921A2 EP0152921A2 (en) 1985-08-28
EP0152921A3 EP0152921A3 (en) 1986-12-10
EP0152921B1 true EP0152921B1 (en) 1989-09-27

Family

ID=6228282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85101631A Expired EP0152921B1 (en) 1984-02-20 1985-02-14 Coating device for sheetlike materials

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US (1) US4765272A (en)
EP (1) EP0152921B1 (en)
AT (1) ATE46633T1 (en)
AU (1) AU568423B2 (en)
DE (2) DE3406099A1 (en)
FI (1) FI81733C (en)

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DE19722117C2 (en) * 1997-05-27 2000-09-07 Bematec S A Coating of porous supports
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DE19858653A1 (en) * 1998-12-18 2000-06-21 Voith Sulzer Papiertech Patent Coating a moving web surface uses a controlled feed pump capacity to set the amount of medium delivered to the applicator to determine the mean coating weight with little or no surplus residue
DE19905318A1 (en) * 1999-02-09 2000-08-10 Voith Sulzer Papiertech Patent Liquid or paste application device for running backing, in which liquid or paste is applied indirectly via a transfer roll
ITBO20000742A1 (en) * 2000-12-22 2002-06-22 Gd Spa METHOD, GROUP AND ARTICULATION RUBBER UNIT
EP2768914B1 (en) 2011-10-19 2018-11-21 3M Innovative Properties Company Articles with thin melt coatings and methods for making same

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Also Published As

Publication number Publication date
DE3573219D1 (en) 1989-11-02
EP0152921A3 (en) 1986-12-10
FI81733B (en) 1990-08-31
FI850473A0 (en) 1985-02-05
DE3406099A1 (en) 1985-08-22
FI81733C (en) 1990-12-10
AU3848185A (en) 1985-08-29
FI850473L (en) 1985-08-21
US4765272A (en) 1988-08-23
AU568423B2 (en) 1987-12-24
ATE46633T1 (en) 1989-10-15
EP0152921A2 (en) 1985-08-28

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