EP0938935A2 - Curtain coating apparatus - Google Patents

Curtain coating apparatus Download PDF

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Publication number
EP0938935A2
EP0938935A2 EP99103029A EP99103029A EP0938935A2 EP 0938935 A2 EP0938935 A2 EP 0938935A2 EP 99103029 A EP99103029 A EP 99103029A EP 99103029 A EP99103029 A EP 99103029A EP 0938935 A2 EP0938935 A2 EP 0938935A2
Authority
EP
European Patent Office
Prior art keywords
air
curtain
shielding device
carrier
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99103029A
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German (de)
French (fr)
Other versions
EP0938935A3 (en
Inventor
Wolfgang Dr. Ellermeier
Christof Dr. Wagner
Joseph Dr. Spurk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agfa Gevaert AG
Original Assignee
Agfa Gevaert AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Agfa Gevaert AG filed Critical Agfa Gevaert AG
Publication of EP0938935A2 publication Critical patent/EP0938935A2/en
Publication of EP0938935A3 publication Critical patent/EP0938935A3/en
Withdrawn legal-status Critical Current

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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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/007—Slide-hopper coaters, i.e. apparatus in which the liquid or other fluent material flows freely on an inclined surface before contacting the work
    • B05C5/008—Slide-hopper curtain coaters

Definitions

  • the invention relates to a device for curtain coating a moving Carrier with at least one layer of a liquid coating composition
  • a device for curtain coating a moving Carrier with at least one layer of a liquid coating composition comprising means of transport that move the carrier in one direction transport through a coating zone with the carrier on the coating side carries a layer of air, a feeder made of liquid coating composition creates a falling curtain on the support falls and wets it along a contact line, a shielding device that shields entrained air from the curtain.
  • the curtain coating process is used for example in the production of photographic films.
  • Passive doctor blades are known, for example, from EP 0 440 279, US 3 867 901, US 3,632,374, Research Disclosure N 189, 1980, DE 12 69 546.
  • active acting shielding devices are for example in EP 0 489 978 and EP 0 704 752.
  • the object of the invention is an improved device for curtain coating specify the influence of those carried by the carrier at high casting speeds Air boundary layer greatly reduced and a uniform coating enables.
  • the shielding device 1 has two air exchange surfaces a, b, each at a distance 2, 3 from the carrier D or spaced from the curtain E and arranged near the contact line F.
  • the shielding device 1 it is preferred to form the shielding device 1 by two chambers A, B. and to connect each chamber to an air conveyor PA, PB.
  • the volume flow through each air exchange surface can then be specified separately become.
  • the contact line position can act on the base as well as towards the curtain and affect the contact angle.
  • Po-P Pressure difference
  • P denotes the air pressure in the immediate vicinity of the contact line F, Po the air pressure in the environment.
  • the Contact line actively influenced by means of a controllable source and sink distribution. This influence occurs with laminar and therefore low flow Flow. The air entrainment with the air layer that the carrier D due to the Carrying speed u is prevented.
  • the volume flows through the air exchange surfaces can be preferred, as in FIG. 2 shown, caused by pumps PA and PB attached to the side of the end faces become.
  • the pumps PA and PB on the outer surface of the cuboid cutting device appropriate.
  • the shielding device advantageously has two separate chambers in one box-shaped housing.
  • the shielding device is both in terms of the position of the center of the box relative to the position of the contact line F as well the angle between b and D or a and E is variable.
  • the curtain coating device according to the invention is schematic in FIG. 4 shown.
  • the shielding device is upstream of the curtain E arranged on the carrier D.
  • Fig. 1 the shielding device is enlarged in a schematic sectional view shown.
  • the device 1 consists of two chambers A and B through an airtight partition C are separated. Each chamber is equipped with an air conveyor connected (Fig. 2 and Fig. 3).
  • the contact line F is determined by the volume flow of the air, which in each case by the Air exchange surface a or b passes through, influenced according to the invention.
  • the device 1 is at a distance of 2 from the curtain E and at a distance of 3 from the support D. arranged. Both distances are adjustable.

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  • Coating Apparatus (AREA)

Abstract

The appliance has a screening device (1) to separate the air from the coating material curtain. The device has two air exchange surfaces (a,b). These are positioned at an adjustable distance (2,3) to carrier (D) resp. curtain (E), and close to the contact line (F) of the coating material on the carrier. The screening device also has two chambers (A,B), separated by a wall (c) and each connected to an air supply device.

Description

Die Erfindung betrifft eine Vorrichtung zum Vorhangbeschichten eines bewegten Trägers mit mindestens einer Schicht einer flüssigen Beschichtungszusammensetzung umfassend Transportmittel, die den Träger in einer Bewegungsrichtung durch eine Beschichtungszone transportieren, wobei der Träger auf der Beschichtungsseite eine Luftschicht mitführt, eine Zufuhrvorrichtung, die aus flüssiger Beschichtungszusammensetzung einen fallenden Vorhang erzeugt, der auf den Träger fällt und diesen entlang einer Kontaktlinie benetzt, eine Abschirmvorrichtung, die mitgeführte Luft vom Vorhang abschirmt. Das Vorhangbeschichtungsverfahren wird beispielsweise bei der Herstellung fotografischer Filme verwendet.The invention relates to a device for curtain coating a moving Carrier with at least one layer of a liquid coating composition comprising means of transport that move the carrier in one direction transport through a coating zone with the carrier on the coating side carries a layer of air, a feeder made of liquid coating composition creates a falling curtain on the support falls and wets it along a contact line, a shielding device that shields entrained air from the curtain. The curtain coating process is used for example in the production of photographic films.

Es ist bekannt, daß beim Vorhangbeschichten die vom Träger mitgeführte Luftschicht die Verfahrensgeschwindigkeit und die Beschichtungsqualität begrenzt. Aus dem Stand der Technik sind verschiedene Verfahren und Vorrichtungen bekannt, die den Einfluß dieser mitgeführten Luftschicht zu vermindern versuchen.It is known that the air layer carried by the carrier during curtain coating the process speed and the coating quality are limited. Out Various methods and devices are known from the prior art which try to reduce the influence of this entrained air layer.

Passiv wirkende Rakel sind beispielsweise aus EP 0 440 279, US 3 867 901, US 3 632 374, Research Disclosure N 189, 1980, DE 12 69 546 bekannt. Aktiv wirkende Abschirmvorrichtungen sind beispielsweise in EP 0 489 978 und EP 0 704 752 offenbart.Passive doctor blades are known, for example, from EP 0 440 279, US 3 867 901, US 3,632,374, Research Disclosure N 189, 1980, DE 12 69 546. active acting shielding devices are for example in EP 0 489 978 and EP 0 704 752.

Bei hohen Beschichtungsgeschwindigkeiten können aber diese bekannten Beschichtungsvorrichtungen die mitbewegte Luftgrenzschicht nicht hinreichend vom Flüssigkeitsvorhang trennen. Es kommt zum sogenannten Air-Entrainment, was zur Qualitätsminderung bzw. zu Ausbeuteverlusten führt.At high coating speeds, however, these known coating devices can the moving air boundary layer is not sufficient from the liquid curtain separate. So-called air entrainment occurs, which leads to a reduction in quality or leads to loss of yield.

Es ist Aufgabe der Erfindung eine verbesserte Vorrichtung zum Vorhangbeschichten anzugeben, die bei hohen Gießgeschwindigkeiten den Einfluß der vom Träger mitgeführten Luftgrenzschicht stark vermindert und eine gleichmäßige Beschichtung ermöglicht.The object of the invention is an improved device for curtain coating specify the influence of those carried by the carrier at high casting speeds Air boundary layer greatly reduced and a uniform coating enables.

Zur Lösung dieses Problems ist die Vorrichtung nach dem Oberbegriff des Anspruchs 1 durch dessen kennzeichnende Merkmale weitergebildet.To solve this problem is the device according to the preamble of the claim 1 further developed by its characteristic features.

Gemäß der Erfindung ist vorgesehen, daß die Abschirmvorrichtung 1 zwei Luftaustauschflächen a, b aufweist, die jeweils in einem Abstand 2, 3 zum Träger D bzw. zum Vorhang E beabstandet und nahe der Kontaktlinie F angeordnet sind.According to the invention it is provided that the shielding device 1 has two air exchange surfaces a, b, each at a distance 2, 3 from the carrier D or spaced from the curtain E and arranged near the contact line F.

Es ist bevorzugt, die Abschirmvorrichtung 1 durch zwei Kammern A, B auszubilden und jede Kammer mit einer Luftfördereinrichtung PA, PB zu verbinden.It is preferred to form the shielding device 1 by two chambers A, B. and to connect each chamber to an air conveyor PA, PB.

Der Volumenstrom durch jede Luftaustauschfläche kann dann getrennt vorgegeben werden.The volume flow through each air exchange surface can then be specified separately become.

Indem die erfindungsgemäße Vorrichtung auf die Luftströmung sowohl im Spalt zur Unterlage hin als auch zum Vorhang hin wirkt, läßt sich die Kontaktlinienposition und der Kontaktwinkel beeinflussen. Mit anderen Worten, bei geeigneter Wahl geometrischer Daten lassen sich über eine individuelle und voneinander abhängige Steuerung der Volumenströme über die beiden Luftaustauschflächen a und b sowohl Druckdifferenz Po-P, die Position der Linie F und auch der Kontaktwinkel beeinflussen. (P kennzeichnet dabei den Luftdruck unmittelbar in der Nähe der Kontaktlinie F, Po den Luftdruck in der Umgebung.) Erfindungsgemäß wird also die Kontaktlinie mittels einer steuerbaren Quellen- und Senkenverteilung aktiv beeinflußt. Diese Beeinflussung geschieht bei laminarer und somit strömungsarmer Strömung. Das Air-Entrainment mit der Luftschicht, die der Träger D aufgrund der Geschwindigkeit u mitführt, wird verhindert. By the device according to the invention to the air flow both in the gap The contact line position can act on the base as well as towards the curtain and affect the contact angle. In other words, with a suitable choice of geometrical Data can be created using an individual and interdependent Control of the volume flows via the two air exchange surfaces a and b both Pressure difference Po-P, influence the position of the line F and also the contact angle. (P denotes the air pressure in the immediate vicinity of the contact line F, Po the air pressure in the environment.) According to the invention, the Contact line actively influenced by means of a controllable source and sink distribution. This influence occurs with laminar and therefore low flow Flow. The air entrainment with the air layer that the carrier D due to the Carrying speed u is prevented.

Die Volumenströme durch die Luftaustauschflächen können bevorzugt, wie in Fig. 2 dargestellt, durch seitlich an Stirnflächen angebrachte Pumpen PA und PB bewirkt werden.The volume flows through the air exchange surfaces can be preferred, as in FIG. 2 shown, caused by pumps PA and PB attached to the side of the end faces become.

In einer anderen bevorzugten Ausführungsform werden, wie in Fig. 3 schematisch dargestellt, die Pumpen PA und PB an der Mantelfläche der quaderförmigen Abschrimvorrichtung angebracht.In another preferred embodiment, as shown in Fig. 3 schematically shown, the pumps PA and PB on the outer surface of the cuboid cutting device appropriate.

Mit Vorteil weist die Abschirmvorrichtung zwei getrennte Kammern in einem kastenförmigen Gehäuse auf.The shielding device advantageously has two separate chambers in one box-shaped housing.

Es ist von besonderem Vorteil wenn die Abschirmvorrichtung sowohl hinsichtlich der Lage des Kastenmittelpunktes relativ zur Lage der Kontaktlinie F als auch hinsichtlich des Winkels zwischen b und D bzw. a und E variabel ist.It is particularly advantageous if the shielding device is both in terms of the position of the center of the box relative to the position of the contact line F as well the angle between b and D or a and E is variable.

Es ist vorteilhaft die Abschirmvorrichtung um die Achse X verstellbar auszuführen. Dadurch kann der Winkel zur Beschichtungsseite des Trägers einstellbar vorgegeben werden. Der Abstand der Vorrichtung zum Vorhang bzw. zum Träger ist mit Vorteil verstellbar.

  • Fig. 1 zeigt im Schnitt eine schematische Darstellung der Abschrimvorrichtung der erfindungsgemäßen Vorrichtung.
  • Fig. 2, 3 zeigen bevorzugte Ausführungsformen der Abschirmvorrichtung.
  • Fig. 4 zeigt schematisch eine Schnittdarstellung der erfindungsgemäßen Vorrichtung zum Vorhangbeschichten.
    • It is advantageous to make the shielding device adjustable about the axis X. As a result, the angle to the coating side of the carrier can be predetermined. The distance of the device from the curtain or from the carrier is advantageously adjustable.
  • Fig. 1 shows in section a schematic representation of the cutting device of the device according to the invention.
  • 2, 3 show preferred embodiments of the shielding device.
  • Fig. 4 shows schematically a sectional view of the device for curtain coating according to the invention.

    • Die erfindungsgemäße Vorhangbeschichtungsvorrichtung ist in Fig. 4 schematisch dargestellt. Die Abschirmvorrichtung ist stromaufwärts vor dem Auftreffen des Vorhangs E auf dem Träger D angeordnet. The curtain coating device according to the invention is schematic in FIG. 4 shown. The shielding device is upstream of the curtain E arranged on the carrier D.

    In Fig. 1 ist die Abschirmvorrichtung vergrößert in einer schematischen Schnittdarstellung gezeigt. Die Vorrichtung 1 besteht aus zwei Kammern A und B die durch eine luftundurchlässige Trennwand C getrennt sind. Jede Kammer ist mit einer Luftfördereinrichtung verbunden (Fig. 2 und Fig. 3).In Fig. 1, the shielding device is enlarged in a schematic sectional view shown. The device 1 consists of two chambers A and B through an airtight partition C are separated. Each chamber is equipped with an air conveyor connected (Fig. 2 and Fig. 3).

    Die Kontaktlinie F wird durch den Volumenstrom der Luft, der jeweils durch die Luftaustauschfläche a bzw. b hindurchtritt, erfindungsgemäß beeinflußt.The contact line F is determined by the volume flow of the air, which in each case by the Air exchange surface a or b passes through, influenced according to the invention.

    Die Vorrichtung 1 ist zum Vorhang E im Abstand 2 und zum Träger D im Abstand 3 angeordnet. Beide Abstände sind einstellbar.The device 1 is at a distance of 2 from the curtain E and at a distance of 3 from the support D. arranged. Both distances are adjustable.

    Claims (6)

    Vorrichtung zum Vorhangbeschichten eines bewegten Trägers mit mindestens einer Schicht einer flüssigen Beschichtungszusammensetzung umfassend Transportmittel, die den Träger in einer Bewegungsrichtung durch eine Beschichtungszone transportieren, wobei der Träger auf der Beschichtungsseite eine Luftschicht mitführt, eine Zufuhrvorrichtung, die aus flüssiger Beschichtungszuammensetzung einen fallenden Vorhang erzeugt, der auf den Träger fällt und diesen entlang einer Kontaktlinie benetzt, eine Abschirmvorrichtung, die mitgeführte Luft vom Vorhang abschirmt, dadurch gekennzeichnet, daß die Abschirmvorrichtung (1) zwei Luftaustauschflächen (a, b) aufweist, die jeweils in einem Abstand (2, 3) zum Träger (D) bzw. zum Vorhang (E) beabstandet und nahe der Kontaktlinie (F) angeordnet sind.Device for curtain coating a moving support with at least a layer of a liquid coating composition Means of transport that carry the carrier in a direction of movement through a coating zone transport with the carrier on the coating side carries a layer of air, a feeder made of liquid coating composition creates a falling curtain on the support falls and wets it along a contact line, a shielding device, shields the entrained air from the curtain, characterized in that the shielding device (1) has two air exchange surfaces (a, b) which each at a distance (2, 3) from the support (D) or the curtain (E) spaced and arranged near the contact line (F). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Abschirmvorrichtung (1) zwei Kammern (A, B) aufweist und jede Kammer mit einer Luftfördereinrichtung (PA, PB) verbunden ist.Device according to claim 1, characterized in that the shielding device (1) has two chambers (A, B) and each chamber with one Air conveyor (PA, PB) is connected. Vorrichtung nach Anspruch 1 oder 2, dadurch gekenzeichnet, daß die Abschirmvorrichtung (1) quaderförmig ausgeführt ist und die Kammern (A, B) durch eine Wand (C) getrennt sind.Device according to claim 1 or 2, characterized in that the shielding device (1) is cuboid and the chambers (A, B) are separated by a wall (C). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Lage der quaderförmigen Abschirmvorrichtung um eine Achse (X) einstellbar ist.Apparatus according to claim 3, characterized in that the position of the cuboid shielding device is adjustable about an axis (X). Vorrichtung nach Anspruch 1 und 3, dadurch gekennzeichnet, daß der Abstand (2, 3) einstellbar ist. Device according to claims 1 and 3, characterized in that the distance (2, 3) is adjustable. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die quaderförmige Abschirmvorrichtung an einer Stirnseite oder an einer Mantelfläche mit einer Luftfördereinrichtung (PA, PB) verbunden ist.Device according to claim 3, characterized in that the cuboid Shielding device on an end face or on a lateral surface is connected to an air conveyor (PA, PB).
    EP99103029A 1998-02-27 1999-02-16 Curtain coating apparatus Withdrawn EP0938935A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19808159 1998-02-27
    DE1998108159 DE19808159A1 (en) 1998-02-27 1998-02-27 Device for coating curtains

    Publications (2)

    Publication Number Publication Date
    EP0938935A2 true EP0938935A2 (en) 1999-09-01
    EP0938935A3 EP0938935A3 (en) 2000-05-03

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    Application Number Title Priority Date Filing Date
    EP99103029A Withdrawn EP0938935A3 (en) 1998-02-27 1999-02-16 Curtain coating apparatus

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    JP (1) JPH11290748A (en)
    DE (1) DE19808159A1 (en)

    Cited By (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP2529927A2 (en) 2007-07-20 2012-12-05 Bayer Innovation Gmbh Polymer composite material with biocide functionality
    US8372417B2 (en) 2007-07-20 2013-02-12 Bayer Innovation Gmbh Polymer composite film with barrier functionality
    US8383549B2 (en) 2007-07-20 2013-02-26 Bayer Cropscience Lp Methods of increasing crop yield and controlling the growth of weeds using a polymer composite film

    Families Citing this family (3)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE10027034A1 (en) 2000-06-02 2001-12-13 Mitsubishi Hitec Paper Flensbu Method and device for curtain coating
    DE10245075A1 (en) * 2002-09-27 2004-04-01 Voith Paper Patent Gmbh commissioned
    DE502006003618D1 (en) 2006-09-01 2009-06-10 Mitsubishi Hitec Paper Bielefe Curtain coating method and a device used therefor

    Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US3632374A (en) 1968-06-03 1972-01-04 Eastman Kodak Co Method of making photographic elements
    DE1269546B (en) 1963-09-20 1974-11-14 4100 Duisburg Dipl Ing Jürgen Schol ten Machine for applying a paint, glue or similar liquid film
    US3867901A (en) 1968-06-03 1975-02-25 Eastman Kodak Co Apparatus for production of photographic elements
    EP0440279A1 (en) 1990-01-29 1991-08-07 Agfa-Gevaert N.V. Curtain coater for photographic elements
    EP0489978A1 (en) 1990-12-12 1992-06-17 Agfa-Gevaert N.V. Curtain coater
    EP0704752A1 (en) 1994-09-27 1996-04-03 Ilford Ag Curtain coating method and device for coating onto a running web

    Family Cites Families (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE1652272C3 (en) * 1967-02-24 1975-06-12 Agfa-Gevaert Ag, 5090 Leverkusen Method and device for coating ribbons, in particular with photographic emulsions

    Patent Citations (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE1269546B (en) 1963-09-20 1974-11-14 4100 Duisburg Dipl Ing Jürgen Schol ten Machine for applying a paint, glue or similar liquid film
    US3632374A (en) 1968-06-03 1972-01-04 Eastman Kodak Co Method of making photographic elements
    US3867901A (en) 1968-06-03 1975-02-25 Eastman Kodak Co Apparatus for production of photographic elements
    EP0440279A1 (en) 1990-01-29 1991-08-07 Agfa-Gevaert N.V. Curtain coater for photographic elements
    EP0489978A1 (en) 1990-12-12 1992-06-17 Agfa-Gevaert N.V. Curtain coater
    EP0704752A1 (en) 1994-09-27 1996-04-03 Ilford Ag Curtain coating method and device for coating onto a running web

    Non-Patent Citations (1)

    * Cited by examiner, † Cited by third party
    Title
    "research disclosure n 189", 1980

    Cited By (4)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    EP2529927A2 (en) 2007-07-20 2012-12-05 Bayer Innovation Gmbh Polymer composite material with biocide functionality
    US8372417B2 (en) 2007-07-20 2013-02-12 Bayer Innovation Gmbh Polymer composite film with barrier functionality
    US8372418B2 (en) 2007-07-20 2013-02-12 Bayer Innovation Gmbh Polymer composite film with biocide functionality
    US8383549B2 (en) 2007-07-20 2013-02-26 Bayer Cropscience Lp Methods of increasing crop yield and controlling the growth of weeds using a polymer composite film

    Also Published As

    Publication number Publication date
    EP0938935A3 (en) 2000-05-03
    DE19808159A1 (en) 1999-09-02
    JPH11290748A (en) 1999-10-26

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