EP1825922B1 - Device for coating - Google Patents

Device for coating Download PDF

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Publication number
EP1825922B1
EP1825922B1 EP20070003378 EP07003378A EP1825922B1 EP 1825922 B1 EP1825922 B1 EP 1825922B1 EP 20070003378 EP20070003378 EP 20070003378 EP 07003378 A EP07003378 A EP 07003378A EP 1825922 B1 EP1825922 B1 EP 1825922B1
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EP
European Patent Office
Prior art keywords
transfer roller
coating
coating medium
medium
nozzle
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EP20070003378
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German (de)
French (fr)
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EP1825922A2 (en
EP1825922A3 (en
Inventor
Martin Jöhren
Frank Redetzky
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Olbrich GmbH
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Olbrich GmbH
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Publication of EP1825922A3 publication Critical patent/EP1825922A3/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
    • B05C1/0817—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0813—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for supplying liquid or other fluent material to the roller

Definitions

  • the invention relates to a device for coating sheet-like materials with a coating medium.
  • the coating media are masses such as dyes, dye dispersions or adhesives.
  • Modern coating devices in particular printing machines, use closed chamber doctor blade systems. Devices with open ink pans and dipping rollers can only be used for low coating speeds. Only through the use of chamber doctoring devices was it possible to achieve a correct and uniform coloring of the transfer rollers at greater production speeds.
  • Such a device is in the European patent specification EP 1 117 488 B disclosed.
  • This coating device describes the application of an adhesive to a continuously transported web. The adhesive is transferred to the web through a line-engraved or also well-engraved roll.
  • the roller has, for example, on its circumference a helically arranged engraving groove.
  • the adhesive is applied by a gun on the circumference of the gravure roll.
  • the applicator has a main chamber for the coating medium.
  • the main chamber is covered by the lateral surface of the transfer roller and limited in the direction of movement of the transfer roller rear gap between the lateral surface and the main chamber by a doctor which sealingly abuts the lateral surface of the transfer roller.
  • the forward gap in the direction of movement of the transfer roller between the lateral surface and the main chamber is limited by a flowing out of a nozzle high-speed medium flow and additionally by a seal. This high-speed media flow exits the nozzle, which extends over the entire width of the transfer roller, counter to the direction of movement of the transfer roller.
  • a preferred variant of the applicator device has a spring-mounted nozzle, as a result of which the drainage surface of the coating material discharged from the nozzle is set free. This ensures that no additional pressure on the seal acts on the main chamber. The result is a minimal coating media flow from the nozzle side into the main chamber, which is determined only by the engraving depth.
  • the application weight is determined solely by the conditions in the main chamber.

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  • Coating Apparatus (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Beschichten bahnförmiger Materialien mit einem Beschichtungsmedium. Bei den Beschichtungsmedien handelt es sich um Massen, wie beispielsweise Farbstoffe, Farbstoffdispersionen oder Klebstoffe.The invention relates to a device for coating sheet-like materials with a coating medium. The coating media are masses such as dyes, dye dispersions or adhesives.

Moderne Beschichtungsvorrichtungen, insbesondere Druckmaschinen, verwenden geschlossene Kammerrakelsysteme. Vorrichtungen mit offenen Farbwannen und Tauchwalzen können nur für geringe Beschichtungsgeschwindigkeiten eingesetzt werden. Erst durch den Einsatz von Kammerrakelvorrichtungen gelang es eine korrekte und gleichmäßige Einfärbung der Übertragungswalzen bei grö-ßeren Produktionsgeschwindigkeiten zu erzielen. Eine solche Vorrichtung ist in der europäischen Patentschrift EP 1 117 488 B offenbart. Diese Beschichtungsvorrichtung beschreibt das Aufbringen eines Klebstoffes auf eine fortlaufend transportierte Bahn. Der Klebstoff wird durch eine liniengravierte oder auch näpfchengravierte Walze auf die Bahn übertragen. Dazu weist die Walze beispielsweise an ihrem Umfang eine schraubenförmig angeordneten Gravurrille auf. Der Klebstoff wird durch einen Auftragskopf auf den Umfang der Gravurwalze aufgebracht. Dazu weist der Auftragskopf zwei durch den Umfang der Gravurwalze abgedeckte Kammern für das aufzutragende Medium auf, nämlich eine Vorkammer und eine in Drehrichtung der Gravurwalze nachfolgende Hauptkammer. Diese beiden Kammern sind durch ein mittleres Dichtorgan voneinander abgegrenzt, welches am Umfang der Gravurwalze anliegt. Die beiden Kammern sind an ihren freien Außenseiten durch je ein Rakel begrenzt, welches dichtend am Umfang der Gravurwalze anliegt. Der Druck in den beiden Kammern kann unabhängig voneinander eingestellt werden, wobei der Druck in der Vorkammer höher gewählt wird. Dadurch soll das Eintreten von Luft verhindert werden. In die Kammer eingeschleppte Luft der sich schnell drehenden Übertragungswalze kann die Beschichtung empfindlich stören. Bei zu geringem Überdruck in der Vorkammer und bei schneller Drehung der Übertragungswalze dringt Luft in die Vorkammer ein. Diese Luft bildet Mikroblasen im Beschichtungsmedium, was insbesondere bei dünnen Beschichtungen zu Ausschussware führt. Bei größeren Produktionsgeschwindigkeiten wird ein höherer Druck in der Vorkammer benötigt, um die Luft aus dem System zu halten. Dieser höhere Druck führt zu Penetrationen von der Vorkammer in die Hauptkammer, woraus ein höherer Minimaldruck in der Hauptkammer und somit ein höheres minimal mögliches Auftraggewicht folgt.Modern coating devices, in particular printing machines, use closed chamber doctor blade systems. Devices with open ink pans and dipping rollers can only be used for low coating speeds. Only through the use of chamber doctoring devices was it possible to achieve a correct and uniform coloring of the transfer rollers at greater production speeds. Such a device is in the European patent specification EP 1 117 488 B disclosed. This coating device describes the application of an adhesive to a continuously transported web. The adhesive is transferred to the web through a line-engraved or also well-engraved roll. For this purpose, the roller has, for example, on its circumference a helically arranged engraving groove. The adhesive is applied by a gun on the circumference of the gravure roll. For this purpose, the applicator head has two chambers covered by the circumference of the gravure roller for the medium to be applied, namely an antechamber and a main chamber following in the direction of rotation of the gravure roller. These two chambers are delimited from each other by a central sealing member, which rests on the circumference of the gravure roll. The two chambers are bounded on their free outer sides by a doctor blade, which bears sealingly on the circumference of the gravure roll. The pressure in the two chambers can be set independently, with the pressure in the pre-chamber being chosen to be higher. This is to prevent the entry of air. Into the chamber entrained air of the rapidly rotating transfer roller can sensitively disturb the coating. If the overpressure in the antechamber is too low and the transfer roller is rotated quickly, air enters the pre-chamber. This air forms micro-bubbles in the coating medium, which leads to rejects, especially with thin coatings. At higher production speeds, a higher pressure in the pre-chamber is needed to keep the air out of the system. This higher pressure leads to penetration from the antechamber into the main chamber, resulting in a higher minimum pressure in the main chamber and thus a higher minimum possible application weight.

Aus dem Dokument DE 102 41 251 A1 ist eine weitere Beschichtungsvorrichtung mit einem Druckkammerrakel bekannt. In Bewegungsrichtung der Übertragungswalze vor der Druckkammer ist eine Vorbenetzungskammer angeordnet. Die Vorbenetzung soll eine Art Schmierung bewirken, so dass die am Eingang der Beschichtungskammer angeordnete Rakel weniger vibriert und eine Schaumbildung verhindert wird.From the document DE 102 41 251 A1 a further coating device with a pressure chamber doctor blade is known. In the direction of movement of the transfer roller in front of the pressure chamber Vorvoretzungskammer is arranged. The pre-wetting is intended to effect a kind of lubrication, so that the doctor blade arranged at the entrance of the coating chamber vibrates less and foaming is prevented.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Beschichten einer bewegten Bahn mit einem Beschichtungsmedium bereitzustellen, die unabhängig von der Beschichtungsgeschwindigkeit eine gleichmäßige Beschichtung der Bahn, insbesondere eine große Spannweite an Auftragsgewicht, erlaubt und die Lufteinschlüsse in der Beschichtungsmasse verhindert.The invention has for its object to provide a device for coating a moving web with a coating medium, which regardless of the coating speed uniform coating of the web, in particular a large range of application weight, allowed and prevents the air pockets in the coating material.

Diese Aufgabe wird erfindungsgemäß mit einer Vorrichtung mit den im Anspruch 1 angegebenen Merkmalen gelöst. Die erfindungsgemäße Vorrichtung besteht im Wesentlichen aus einer Auftragsvorrichtung, einer Übertragungswalze und einer Gegenwalze, wobei die Funktion der Gegenwalze auch von Slipwalzen erfüllt werden kann.. Zwischen der Übertragungswalze und der Gegenwalze wird die bewegte Bahn geführt und dabei das Beschichtungsmedium auf die Bahn übertragen. Das Beschichtungsmedium wird in der Auftragsvorrichtung auf die Übertragungswalze aufgebracht. Dazu besitzt die Übertragungswalze entsprechende Vertiefungen, die das Medium aufnehmen und in welchen das Medium zur Bahn transportiert wird.This object is achieved with a device having the features specified in claim 1. The device according to the invention essentially consists of an application device, a transfer roller and a counter roller, wherein the function of the counter roller can also be fulfilled by slip rollers. Between the transfer roller and the counter roller, the moving web is guided while transferring the coating medium to the web. The coating medium is applied to the transfer roller in the applicator. For this purpose has the transfer roller corresponding wells that receive the medium and in which the medium is transported to the web.

Die Auftragsvorrichtung besitzt eine Hauptkammer für das Beschichtungsmedium. An der freien Außenseite, vorzugsweise an der Oberseite, wird die Hauptkammer durch die Mantelfläche der Übertragungswalze abgedeckt und der in Bewegungsrichtung der Übertragungswalze hintere Spalt zwischen Mantelfläche und Hauptkammer durch ein Rakel begrenzt, welches dichtend an der Mantelfläche der Übertragungswalze anliegt. Der in Bewegungsrichtung der Übertragungswalze vordere Spalt zwischen Mantelfläche und Hauptkammer wird durch einen aus einer Düse ausfließenden Hochgeschwindigkeitsmedienstrom und zusätzlich durch eine Dichtung begrenzt. Dieser Hochgeschwindigkeitsmedienstrom tritt entgegen der Bewegungsrichtung der Übertragungswalze aus der Düse, die sich über die gesamte Breite der Übertragungswalze erstreckt, aus.The applicator has a main chamber for the coating medium. At the free outside, preferably at the top, the main chamber is covered by the lateral surface of the transfer roller and limited in the direction of movement of the transfer roller rear gap between the lateral surface and the main chamber by a doctor which sealingly abuts the lateral surface of the transfer roller. The forward gap in the direction of movement of the transfer roller between the lateral surface and the main chamber is limited by a flowing out of a nozzle high-speed medium flow and additionally by a seal. This high-speed media flow exits the nozzle, which extends over the entire width of the transfer roller, counter to the direction of movement of the transfer roller.

Bei dem Medium für den Hochgeschwindigkeitsmedienstrom handelt es sich vorzugsweise um das Beschichtungsmedium. Es besteht jedoch auch die Möglichkeit eine gewünschte zweite Komponente mittels des Medienstroms gezielt hinzuzudosieren. Die Geschwindigkeit des Medienstroms wird in Abhängigkeit vom Beschichtungsmedium, insbesondere der Viskosität des Beschichtungsmediums und der Düsenform gewählt. Dieser Hochgeschwindigkeitsmedienstrom stellt zum einen eine Begrenzung der Hauptkammer dar und verhindert das Eintreten von Luft durch den Spalt in das System. In gleicher Weise wird auch ein Einbringen von Luft durch die Bewegung der Übertragungswalze verhindert und es erfolgt ein Reinigen der Vertiefungen der Übertragungswalze vor dem Eintritt in die Beschichtungskammer. Bei Verwendung des Beschichtungsmediums für den Hochgeschwindigkeitsmedienstrom werden die Vertiefungen befüllt, so dass in der Beschichtungskammer die Beschichtungsmasse nur noch entsprechend nachdosiert werden muss.The medium for the high-speed media stream is preferably the coating medium. However, it is also possible to selectively add a desired second component by means of the media stream. The speed of the media flow is selected depending on the coating medium, in particular the viscosity of the coating medium and the nozzle shape. This high-speed media flow, on the one hand, constitutes a boundary of the main chamber and prevents the entry of air through the gap into the system. In the same way, an introduction of air is prevented by the movement of the transfer roller and there is a cleaning of the recesses of the transfer roller before entering the coating chamber. When using the coating medium for the high-speed media flow, the recesses are filled, so that in the coating chamber, the coating material only needs to be replenished accordingly.

Die Medien, insbesondere der Hochgeschwindigkeitsmedienstrom kann auch temperiert werden. Dies wird insbesondere dann vorgesehen, wenn viskose Beschichtungsmedien verwendet werden, die bei Zimmertemperatur nicht auftragbar sind.The media, in particular the high-speed media stream can also be tempered. This is especially provided when viscous coating media are used, which are not applicable at room temperature.

Durch die Ausgestaltung der Düse kann die Strömungsrichtung des Hochgeschwindigkeitsmedienstroms festgelegt werden. Bevorzugt wird der Hochgeschwindigkeitsmedienstrahl leicht entgegen der Laufrichtung der Übertragungswalze gerichtet. Darüber hinaus kann in Abhängigkeit vom Beschichtungsmedium und vom Druck in der Hauptkammer der vordere Spalt zwischen Kammer und Übertragungswalze durch eine höhenverstellbare Düse eingestellt werden. Die Düse ist gemäß einer vorteilhaften Ausführungsform höhen- und neigungsverstellbar. Bevorzugt wird ein schmaler scharfer Hochgeschwindigkeitsmedienstrahl, da bei einem breitgefächerten Strahl mehr Beschichtungsmasse benötigt wird.Due to the design of the nozzle, the flow direction of the high-speed media flow can be determined. Preferably, the high-speed media jet is directed slightly against the direction of travel of the transfer roller. In addition, depending on the coating medium and the pressure in the main chamber, the front gap between the chamber and the transfer roller can be adjusted by a height-adjustable nozzle. The nozzle is height and tilt adjustable according to an advantageous embodiment. A narrow, sharp, high-speed media jet is preferred because more coating mass is required for a wide-spread jet.

Eine bevorzugte Variante der Auftragsvorrichtung besitzt eine federn gelagerte Düse, dadurch stellt sich die Ablauffläche der von der Düse ausgetragenen Beschichtungsmasse frei ein. Somit ist gewährleistet, dass keine zusätzliche Druckbelastung auf die Abdichtung zur Hauptkammer wirkt. Es ergibt sich ein minimaler Beschichtungsmedienfluss von der Düsenseite in die Hauptkammer, der sich lediglich durch die Gravurtiefe bestimmt. Das Auftragsgewicht wird allein durch die Bedingungen in der Hauptkammer bestimmt.A preferred variant of the applicator device has a spring-mounted nozzle, as a result of which the drainage surface of the coating material discharged from the nozzle is set free. This ensures that no additional pressure on the seal acts on the main chamber. The result is a minimal coating media flow from the nozzle side into the main chamber, which is determined only by the engraving depth. The application weight is determined solely by the conditions in the main chamber.

Weitere Maßnahmen und Vorteile der Erfindung werden anhand der nachfolgenden Beschreibung und den Zeichnungen dargestellt. Diese zeigen in

Fig.1
Prinzipskizze einer erfindungsgemäßen Beschichtungsvorrichtung und
Fig.2
Prinzipskizze eines Teiles einer weiteren erfindungsgemäßen Beschichtungsvorrichtung.
Further measures and advantages of the invention will become apparent from the following description and the drawings. These show in
Fig.1
Schematic diagram of a coating device according to the invention and
Fig.2
Schematic diagram of a part of another coating device according to the invention.

Die Fig. 1 der Zeichnung zeigt eine Prinzipskizze einer erfindungsgemäßen Vorrichtung. Die dargestellte Vorrichtung zum Beschichten einer bewegten Bahn 1 mit einem Beschichtungsmedium 6 besteht im Wesentlichen aus der Gegenwalze 2 und der Übertragungswalze 3 und einer Auftragsvorrichtung 10. Die kontinuierlich fortlaufende Bahn 1 läuft zwischen Gegenwalze und Übertragungswalze 3 hindurch, wobei sie das Beschichtungsmedium 6 aufnimmt.The Fig. 1 The drawing shows a schematic diagram of a device according to the invention. The illustrated apparatus for coating a moving web 1 with a coating medium 6 consists essentially of the Counter roll 2 and the transfer roller 3 and an applicator 10. The continuously continuous web 1 passes between counter-roller and transfer roller 3, wherein it receives the coating medium 6.

Dieses Beschichtungsmedium 6 wird von der Übertragungswalze 3 von der Auftragsvorrichtung 10 bis zur Bahn 1 transportiert. Dazu besitzt die Übertragungswalze 3 entsprechende Vertiefungen 4 in ihrer Mantelfläche 5. Diese Vertiefungen 4 können unterschiedliche Gravuren sein. Wie der Zeichnung zu entnehmen, werden die Vertiefungen 4 in der Auftragsvorrichtung 10 befüllt und die mit Beschichtungsmedium 6 gefüllten Vertiefungen 4' durch die Drehung der Übertragungswalze 3 in Kontakt mit der Bahn 1 gebracht. Nach dieser Kontaktstelle sind die Vertiefungen 4" teilweise entleert, d.h. können Reste des Beschichtungsmediums 6 enthalten. Durch die Rotation der Übertragungswalze 3 würden diese Reste des Beschichtungsmediums 6 zusammen mit in den Vertiefungen 4" enthaltener Luft in die Kammer 12 der Auftragsvorrichtung 10 eingebracht werden. Dies wird jedoch durch den Hochgeschwindigkeitsmedienstrom 7, der aus der Düse 15 der Auftragsvorrichtung 10 austritt, verhindert. Bei dieser Beschichtungsvorrichtung wird für den Hochgeschwindigkeitsmedienstrahl 7 im wesentlichen als Medium das Beschichtungsmedium 6 verwendet.This coating medium 6 is transported by the transfer roller 3 from the applicator 10 to the web 1. For this purpose, the transfer roller has 3 corresponding recesses 4 in its lateral surface 5. These recesses 4 may be different engravings. As can be seen from the drawing, the depressions 4 are filled in the application device 10 and the filled with coating medium 6 wells 4 'brought by the rotation of the transfer roller 3 in contact with the web 1. Die Vertiefungen 4 und 4 sind in den Auflagen 10 bzw. After this contact point, the depressions 4 "are partially emptied, i.e. may contain residues of the coating medium 6. By rotation of the transfer roller 3, these remnants of the coating medium 6 would be introduced into the chamber 12 of the applicator 10 together with air contained in the depressions 4". However, this is prevented by the high-speed media stream 7 exiting the nozzle 15 of the applicator 10. In this coating apparatus, the coating medium 6 is used for the high-speed media jet 7 substantially as a medium.

Dieser Hochgeschwindigkeitsmedienstrom 7 und die Dichtung 20 begrenzen den Spalt 16' zwischen der Mantelfläche 5 der Übertragungswalze 3 und der Hauptkammer 12 der Auftragsvorrichtung 10. Mittels dieses Hochgeschwindigkeitsmedienstroms 7 werden anhaftende Reste des Beschichtungsmediums 6 und Luft aus den Vertiefungen 4" herausgespült und die Vertiefungen 4"' mit frischen Beschichtungsmedium 6 des Hochgeschwindigkeitsmedienstrahls 7 befüllt. Diese vorgefüllten Vertiefungen 4"' werden durch die Rotation der Übertragungswalze 3 in den Bereich der Hauptkammer 12 der Auftragsvorrichtung 10 gebracht. Die herausgespülten Reste an Beschichtungsmedium 6 werden in einer zur Düse 15 benachbarten Ablaufkammer 17 gesammelt und abhängig vom Beschichtungsmedium 6 anschließend der Auftragsvorrichtung 10 wieder zugeführt.This high-speed media stream 7 and the seal 20 define the gap 16 'between the lateral surface 5 of the transfer roller 3 and the main chamber 12 of the applicator 10. By means of this high-speed media stream 7 adhering residues of the coating medium 6 and air are flushed out of the wells 4 "and the wells 4"'filled with fresh coating medium 6 of the high-speed media jet 7. These prefilled depressions 4 "'are brought into the region of the main chamber 12 of the application device 10 by the rotation of the transfer roller 3. The residues of coating medium 6 which have been purged are collected in a discharge chamber 17 adjacent to the nozzle 15 and become dependent from the coating medium 6 then the applicator 10 is fed again.

Die Hauptkammer 12 der Auftragsvorrichtung 10 besitzt eine untere Öffnung, durch die das Beschichtungsmedium 6 zugeführt wird. Nach oben wird diese Kammer 12 durch die Übertragungswalze 3 abgedeckt, wobei in Bewegungsrichtung der Übertragungswalze 3, angedeutet durch den Pfeil, ein vorderer Spalt 16' und ein hinterer Spalt 14 verbleibt. Der hintere Spalt 14 wird durch ein Rakel 13 begrenzt. Das Rakel 13 liegt dabei dichtend an der Mantelfläche 5 der Übertragungswalze 3 an. Durch die Position dieses Rakels 13, die den Austrittsspalt 14 begrenzt, wird ein Austrag einer unkontrollierten Menge des Beschichtungsmediums 6 verhindert. Die gewünschte Befüllung der Vertiefungen 4 in der Übertragungswalze 3 wird beim Durchlaufen der Übertragungswalze 3 durch die Hauptkammer 12 erzielt. Die durch den Hochgeschwindigkeitsmedienstrahl 7 befüllten Vertiefungen 4"' werden abhängig vom Druck P in der Hauptkammer 12 überfüllt, d.h. in der Hauptkammer 12 wird das Auftragsgewicht an Beschichtungsmedium 6 bestimmt.The main chamber 12 of the applicator 10 has a lower opening through which the coating medium 6 is supplied. At the top, this chamber 12 is covered by the transfer roller 3, wherein in the direction of movement of the transfer roller 3, indicated by the arrow, a front gap 16 'and a rear gap 14 remains. The rear gap 14 is limited by a doctor blade 13. The doctor 13 is sealingly against the lateral surface 5 of the transfer roller 3. Due to the position of this squeegee 13, which limits the exit slit 14, a discharge of an uncontrolled amount of the coating medium 6 is prevented. The desired filling of the recesses 4 in the transfer roller 3 is achieved when passing through the transfer roller 3 through the main chamber 12. The pits 4 "'filled by the high-speed media jet 7 are overfilled depending on the pressure P in the main chamber 12, that is, in the main chamber 12, the application weight of the coating medium 6 is determined.

Im Beschichtungsbetrieb wird mittels einer nicht dargestellter Vorrichtung das Beschichtungsmedium 6 in die Hauptkammer 12 der Auftragsvorrichtung 10 gepumpt. Der Druck P in der Hauptkammer 12 wird mittels nicht dargestellter Einrichtungen eingestellt. Bei Bedarf kann das Beschichtungsmedium 6 durch entsprechende Heizvorrichtungen auf eine gewünschte Temperatur eingestellt werden. Durchläuft die Übertragungswalze 3 die Hauptkammer 12 werden die gefüllten Vertiefungen 4"' überfüllt, wobei die Überfüllung des Beschichtungsmediums 6 durch den Druck P in der Kammer 12 einstellbar ist. Die mit Beschichtungsmedium 6 überfüllten Vertiefungen 4' transportieren das Beschichtungsmedium 6 zur Kontaktstelle mit der Bahn 1, wo die Bahn 1 unter Druckausübung der Gegenwalze 2 das Beschichtungsmedium 6 aufnimmt. Die teilweise entleerten Vertiefungen 4" werden durch die Rotation der Übertragungswalze, in diesem Fall im Uhrzeigersinn, wieder zur Auftragsvorrichtung 10 bewegt.In coating operation, the coating medium 6 is pumped into the main chamber 12 of the application device 10 by means of a device, not shown. The pressure P in the main chamber 12 is adjusted by means not shown. If necessary, the coating medium 6 can be adjusted by appropriate heating devices to a desired temperature. When the transfer roller 3 passes through the main chamber 12, the filled cavities 4 "are filled, the overfilling of the coating medium 6 being adjustable by the pressure P in the chamber 12. The cavities 4 'overfilled with the coating medium 6 transport the coating medium 6 to the point of contact with the web 1, where the web 1 receives the coating medium 6 under pressure from the counter roll 2. The partially empty depressions 4 "are moved back to the application device 10 by the rotation of the transfer roll, in this case in the clockwise direction.

Vor Eintritt der Übertragungswalze 3 in die Auftragsvorrichtung 10 befindet sich in den Vertiefungen 4" eine Restmenge des Beschichtungsmediums 6. Diese Restmenge des Beschichtungsmediums 6 wird durch den Hochgeschwindigkeitsmedienstrom 7 vor Passieren des Spaltes 16' aus den Vertiefungen 4" größtenteils herausgelöst. Die gefüllten Vertiefungen 4"', die keine Luft enthalten, gelangen dann in die Hauptkammer 12 der Auftragsvorrichtung 10.Before the transfer roller 3 enters the applicator 10, a residual amount of the coating medium 6 is contained in the recesses 4 ". This residual amount of the coating medium 6 is largely removed from the recesses 4" by the high-speed media stream 7 before passing the gap 16 '. The filled wells 4 "', which contain no air, then enter the main chamber 12 of the applicator 10th

Bei dem Hochgeschwindigkeitsmedienstrom 7 handelt es sich vorzugsweise um das Beschichtungsmedium 6. Die Geschwindigkeit des Hochgeschwindigkeitsmedienstroms 7 wird mittels nicht dargestellter Pumpen erzielt.The high-speed media stream 7 is preferably the coating medium 6. The speed of the high-speed media stream 7 is achieved by means not shown pumps.

Der Hochgeschwindigkeitsmedienstrom 7 wird aus der Kammer 11, welche auch ein Rohr sein kann, durch eine Düse 15 ausgetragen. Diese Düse 15 ist vorzugsweise eine Schlitzdüse, die in ihrer Breite der Breite der Übertragungswalze 3 entspricht. Der Schlitz der Düse 15 wird in diesem Ausführungsbeispiel durch die Wandungen 18, 19 gebildet. Die Schlitzbreite der Düse 15 und der Abstand der Düse 15 von der Übertragungswalze 3 ist in der Fig. 1 nicht maßstabgerecht gezeichnet.The high-speed media stream 7 is discharged from the chamber 11, which may also be a pipe, through a nozzle 15. This nozzle 15 is preferably a slot nozzle, which corresponds in width to the width of the transfer roller 3. The slot of the nozzle 15 is formed in this embodiment by the walls 18, 19. The slit width of the nozzle 15 and the distance of the nozzle 15 from the transfer roller 3 is in the Fig. 1 not drawn to scale.

Die Düse 15 kann höhenverstellbar vorgesehen sein. Dadurch verändert sich der Spalt 16 zwischen der Düse 15 und der Übertragungswalze 3.The nozzle 15 may be provided adjustable in height. As a result, the gap 16 between the nozzle 15 and the transfer roller 3 changes.

Bei einer weiteren Auftragsvorrichtung kann die Düse ist federn gelagert sein und verstellt sich somit in Abhängigkeit der Austrittsgeschwindigkeit und der Viskosität des für den Hochgeschwindigkeitsmedienstrom verwendeten Mediums im Abstand zur Übertragungswalze 3 frei ein.In a further application device, the nozzle may be mounted springs and thus adjusts depending on the exit velocity and the viscosity of the medium used for the high-speed media flow at a distance from the transfer roller 3 free.

Der Spalt 16', der den Eintrittsspalt in die Hauptkammer 12 darstellt, ist durch eine Dichtung 20 abgedichtet. Diese Dichtung 20 behält aufgrund ihrer Elastizität immer Kontakt zur Übertragungswalze 3.The gap 16 ', which represents the entrance slit into the main chamber 12, is sealed by a seal 20. Due to its elasticity, this seal 20 always maintains contact with the transfer roller 3.

Die erfindungsgemäße Vorrichtung ermöglicht durch die Verwendung eines Hochgeschwindigkeitsmedienstroms eine signifikant bessere Abdichtung des Spaltes 16' zur Hauptkammer, 12 und verhindert damit das Eintragen von Luftblasen in diese Kammer 12 der Auftragsvorrichtung. Darüber hinaus werden bei dieser Beschichtungsvorrichtung nur minimale Mengen an Beschichtungsmedium 6 aus der Hauptkammer 12 durch den Spalt 16 ausgetragen. Ein weiterer wesentlicher Vorteil dieser neuen Beschichtungsvorrichtung ist die Möglichkeit bei hohen Beschichtungsgeschwindigkeiten minimale Auftraggewichte zu realisieren.The device according to the invention allows a significantly better sealing of the gap 16 'to the main chamber, 12 and thus prevents the entry of air bubbles in this chamber 12 of the application device by using a high-speed media flow. Moreover, in this coating apparatus, only minimal amounts of coating medium 6 are discharged from the main chamber 12 through the gap 16. Another important advantage of this new coating device is the possibility to realize minimum application weights at high coating speeds.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Bahntrain
22
Gegenwalzebacking roll
33
Übertragungswalzetransfer roller
44
Vertiefungenwells
4'4 '
Vertiefungen, vollWells, full
4"4 '
Vertiefungen, entleertWells, drained
4"'4 ' "
Vertiefungen, gefülltWells, filled
55
Mantelflächelateral surface
66
Mediummedium
77
HochgeschwindigkeitsmedienstromHigh-speed media stream
1010
Auftragsvorrichtungapplicator
1111
Kammerchamber
1212
Hauptkammermain chamber
1313
Rakeldoctor
1414
Mediummedium
1515
Düsejet
1616
Spaltgap
16'16 '
Spaltgap
1717
Ablaufkammerdrain chamber
1818
Wandungwall
1919
Wandungwall
2020
Dichtungpoetry
PP
Druck in 12Pressure in 12

Claims (6)

  1. Device for coating web-shaped materials with a coating medium (6),
    with a rotating counter roller (2) and with a rotating transfer roller (3), that features recesses (4) on its surface shell (5) for transferring the coating medium (6),
    with an application device (10) for filling the recesses (4) of the transfer roller (3) with coating medium (6), whereby, the direction of application (10) of the coating medium (6) features a main chamber (12) that is bounded on one free external side by the surface shell (5) of the transfer roller (3) and by restrictive detents at the outlet of the coating medium (6),
    whereby, the rear gap (14) between the surface shell (5) and main chamber (12) in the direction of travel of the transfer roller (3) is bounded by a scraper (13), which rests on the surface shell (5) of the transfer roller (3) to form a seal,
    characterized in that,
    the front gap (16') between the surface shell (5) and main chamber (12) in the direction of travel of the transfer roller (3) is bounded by a seal (20) and media flowing at high speed (7) out of a nozzle (15),
    whereby, the media flowing at high speed (7) escapes from the nozzle (15) vertically to the transfer roller (3) or opposite to the direction of travel of the transfer roller (3),
    whereby, there is a gap (16) between the transfer roller (3) and the nozzle (15).
  2. Device according to claim 1, characterized in that the nozzle (15) is spring-mounted and height adjustable.
  3. Device according to one of the claims 1 or 2, characterized in that the nozzle (15) has a width that equates to the width of the transfer roller (3).
  4. Device according to one of the claims 1 to 3, characterized in that the medium selected for the coating medium (6) is the medium flowing at high speed (7).
  5. Device according to claim 1, characterized in that the direction of flow of the medium flowing at high speed (7) is set so that, simultaneously, with shutting off the gap (16, 16') of the main chamber (12) upstream of the air inlet and coating medium outlet there is the greatest possible distance to the residual coating medium (6) from the recesses (4") of the transfer roller (3).
  6. Device according to claim 4, characterized in that the direction of flow of the medium flowing at high speed (7) is set so that, simultaneously, with shutting off the gap (16, 16') of the main chamber (12) upstream of the air inlet and coating medium outlet there is the greatest possible distance to the residual coating medium (6) from the recesses (4") of the transfer roller (3) and it is possible to fill the recesses (4"').
EP20070003378 2006-02-28 2007-02-17 Device for coating Active EP1825922B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200620003265 DE202006003265U1 (en) 2006-02-28 2006-02-28 Device for coating

Publications (3)

Publication Number Publication Date
EP1825922A2 EP1825922A2 (en) 2007-08-29
EP1825922A3 EP1825922A3 (en) 2008-06-25
EP1825922B1 true EP1825922B1 (en) 2014-04-09

Family

ID=36372094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070003378 Active EP1825922B1 (en) 2006-02-28 2007-02-17 Device for coating

Country Status (3)

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EP (1) EP1825922B1 (en)
DE (1) DE202006003265U1 (en)
ES (1) ES2477365T3 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008016098U1 (en) * 2008-12-05 2009-03-05 Herbert Olbrich Gmbh & Co. Kg Apparatus for coating web-like materials
DE102010049387A1 (en) * 2010-10-26 2012-04-26 Sam Sungan Ralph Pagendarm Gmbh Device for applying a flowable medium to a web
EP3722009A1 (en) 2019-03-29 2020-10-14 Airbus Operations GmbH Device and system
EP3725539A1 (en) 2019-03-29 2020-10-21 Airbus Operations GmbH Device for lacquer transfer
EP3725422A1 (en) 2019-04-12 2020-10-21 Airbus Operations GmbH Device for lacquer transfer
US11554383B2 (en) 2020-02-17 2023-01-17 Airbus Operations Gmbh System for lacquer transfer
CN112317250A (en) * 2020-09-30 2021-02-05 西安航天华阳机电装备有限公司 High-efficient two-sided coating device of lithium cell diaphragm

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19508745A1 (en) * 1995-03-10 1996-09-12 Josef Dr Hefele Process for grid-like coating of fabrics with hot melt adhesives using the gravure printing process
DE19845427A1 (en) * 1998-10-02 2000-04-06 Basf Ag Fluid applicator, for applying a polymer or adhesive dispersion onto a moving surface, has a separation element between initial and main fluid supply chambers for defining a separation gap with the surface
DE10241251B4 (en) * 2002-09-06 2006-05-11 Maschinenfabrik Max Kroenert Gmbh & Co. Method and arrangement for applying a liquid medium to a moving surface

Also Published As

Publication number Publication date
ES2477365T3 (en) 2014-07-16
EP1825922A2 (en) 2007-08-29
DE202006003265U1 (en) 2006-04-27
EP1825922A3 (en) 2008-06-25

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