EP0704752A1 - Curtain coating method and device for coating onto a running web - Google Patents

Curtain coating method and device for coating onto a running web Download PDF

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Publication number
EP0704752A1
EP0704752A1 EP94810560A EP94810560A EP0704752A1 EP 0704752 A1 EP0704752 A1 EP 0704752A1 EP 94810560 A EP94810560 A EP 94810560A EP 94810560 A EP94810560 A EP 94810560A EP 0704752 A1 EP0704752 A1 EP 0704752A1
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EP
European Patent Office
Prior art keywords
curtain
air
pouring
support
carrier
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.)
Granted
Application number
EP94810560A
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German (de)
French (fr)
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EP0704752B1 (en
Inventor
Markus Gueggi
Maurice Pasquier
Peter Schweizer
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Ilford Imaging Switzerland GmbH
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Ilford AG
Ilford Imaging Switzerland GmbH
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Filing date
Publication date
Application filed by Ilford AG, Ilford Imaging Switzerland GmbH filed Critical Ilford AG
Priority to DE59409768T priority Critical patent/DE59409768D1/en
Priority to EP94810560A priority patent/EP0704752B1/en
Priority to JP24955595A priority patent/JP3681443B2/en
Priority to US08/534,842 priority patent/US5624715A/en
Publication of EP0704752A1 publication Critical patent/EP0704752A1/en
Application granted granted Critical
Publication of EP0704752B1 publication Critical patent/EP0704752B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/74—Applying photosensitive compositions to the base; Drying processes therefor
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/04—Curtain coater

Definitions

  • the present invention relates to a method and an apparatus for curtain coating a moving support with a liquid coating material.
  • the curtain coating especially with the large width of the machines and high speed, there are a large number of problems in order to stabilize the liquid curtain and to bring it onto the base as evenly as possible.
  • One of these problems is that the free falling liquid film is forward, i.e. is deformed in the direction of the moving carrier. This deviation from the vertical fall direction occurs due to the air boundary layer running along with the carrier.
  • EP-A-0 489 978 a coating device is known which has an air shield which, as seen in the direction of the moving carrier, is attached in front of the liquid film and has an opening from which the shield can move stowed air is extracted.
  • a shield By using a shield, the distance between the suction point and the curtain is quite large, which reduces the effectiveness of the arrangement.
  • EP-A-0 551 237 discloses a method and a device for curtain coating in which an attempt is made to stabilize the air in front of the curtain by measuring the air pressure prevailing in the space in front of the curtain in order to starting from a setpoint, either supplying or removing air. Precise control, however, requires a lot of equipment in order to maintain a uniform air pressure across the entire width of the machine.
  • Figure 1 shows the part of a coating system essential to the invention in section with a schematically illustrated pourer 1, which opens into a pouring lip 2, from which the liquid film 3, hereinafter called the curtain, falls freely in the direction of the casting roller 4, on which the carrier 5 is schematically recorded , which moves in the direction of the arrow, see also FIG. 2.
  • the curtain is delimited on both sides by side guides 6.
  • a doctor blade 7 is arranged in front of the curtain, at a distance b, see FIG.
  • the squeegee must therefore be a carrier with a sufficient height and thus high Area moment of inertia are formed.
  • the doctor blade on the casting roll side 13 is shaped approximately parallel to the surface of the casting roll or the carrier and merges into a lower part 14 which runs approximately at right angles to the casting roll surface.
  • the rear surface 15 of the doctor blade runs parallel to the front of the base 16 or to the individual foundry plates of the foundry 1.
  • the area in front of the curtain is delimited at the top by the underside 9 of the pouring lip 2, at the bottom by the support 5, opposite the curtain by the front 8 of the doctor blade, and on both sides by the side guides 6 and is therefore a practically closed space 10
  • Special measures would arise from the air boundary layer 11 along the falling curtain, see FIG. 2, rotating air vortices 12, which can be divided into individual unstable cells. As a result, the flow of the curtain is disturbed and restless, which leads to a reduced casting quality.
  • an opening 22 extending over the entire width of the machine is provided between the rear upper edge 20 of the doctor blade and the foremost foundry plate 21, which opening is connected to a second duct 23 and to a second fan 24.
  • the air supply opening 22 opens at the bottom 9 of the pouring lip 2, so that the air arriving there at a low speed is deflected downward and is finally sucked off by the squeegee or its slot 17.
  • a very uniform flow can be generated by various measures, the air supplied preferably being preheated.
  • the dynamic wetting line 26 can be set at the desired location. Since the squeegee, as explained above, stabilizes the dynamic wetting line, a combination of the measures described achieves a uniform coating.
  • the air extraction and supply devices can be combined and controlled into one unit.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

The device for curtain coating comprises a pourer (1) with a pouring lip (2) and a pouring roller (4) for guiding a carrier (5). In front of the curtain (3) is arranged a suction device which contains a suction ductor (7), whose front edge (8) directed towards the curtain has a slot (17) connected to a vacuum device. The pourer is formed from a pourer plate (21) with a pouring lip and a pouring roller. In the foremost pourer plate beneath the pouring lip is an opening (22) arranged parallel to the curtain, and which is connected to an air feed device. The opening is formed by a gap between the rear surface (15) of the suction ductor turned away from the curtain and the front side of the foremost pourer plate.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial. Bei der Vorhangbeschichtung, insbesondere bei grosser Breite der Maschinen und grosser Geschwindigkeit ergeben sich eine grosse Anzahl von Problemen, um den Flüssigkeitsvorhang zu stabilisieren und möglichst gleichmässig auf die Unterlage zu bringen. Eines dieser Probleme besteht darin, dass der frei fallende Flüssigkeitsfilm nach vorne, d.h. in Richtung des bewegten Trägers deformiert wird. Diese Abweichung von der senkrechten Fallrichtung erfolgt durch die mit dem Träger mitlaufende Luftgrenzschicht.The present invention relates to a method and an apparatus for curtain coating a moving support with a liquid coating material. With the curtain coating, especially with the large width of the machines and high speed, there are a large number of problems in order to stabilize the liquid curtain and to bring it onto the base as evenly as possible. One of these problems is that the free falling liquid film is forward, i.e. is deformed in the direction of the moving carrier. This deviation from the vertical fall direction occurs due to the air boundary layer running along with the carrier.

Es sind verschiedene Verfahren und Vorrichtungen bekannt, um den Flüssigkeitsvorhang in dieser Beziehung zu stabilisieren. So ist, unter anderem, aus der EP-A-0 489 978 eine Vorrichtung zur Beschichtung bekannt, die ein Luftschild aufweist, das, in Richtung des bewegten Trägers gesehen, vor dem Flüssigkeitsfilm angebracht ist und eine Oeffnung aufweist, aus der die im Schild gestaute Luft abgesaugt wird. Durch die Verwendung eines Schildes wird der Abstand zwischen der Absaugstelle und dem Vorhang recht gross, wodurch sich die Wirksamkeit der Anordnung verringert. Ausserdem ist aus der EP-A-0 551 237 ein Verfahren und eine Vorrichtung zur Vorhangbeschichtung bekannt, in dem versucht wird, die sich vor dem Vorhang befindliche Luft dadurch zu stabilisieren, dass der im Raum vor dem Giessvorhang herrschende Luftdruck gemessen wird, um, ausgehend von einem Sollwert, Luft entweder zu- oder abzuführen. Eine genaue Kontrolle erfordert jedoch einen hohen apparativen Aufwand, um über die ganze Breite der Maschine einen gleichmässigen Luftdruck zu erhalten.Various methods and devices are known to stabilize the liquid curtain in this regard. Thus, inter alia, from EP-A-0 489 978 a coating device is known which has an air shield which, as seen in the direction of the moving carrier, is attached in front of the liquid film and has an opening from which the shield can move stowed air is extracted. By using a shield, the distance between the suction point and the curtain is quite large, which reduces the effectiveness of the arrangement. In addition, EP-A-0 551 237 discloses a method and a device for curtain coating in which an attempt is made to stabilize the air in front of the curtain by measuring the air pressure prevailing in the space in front of the curtain in order to starting from a setpoint, either supplying or removing air. Precise control, however, requires a lot of equipment in order to maintain a uniform air pressure across the entire width of the machine.

Es ist von diesem Stand der Technik ausgehend Aufgabe der vorliegenden Erfindung ein Verfahren und eine Vorrichtung zur Vorhangbeschichtung anzugeben, mit denen der Einfluss der vom bewegten Träger mitgeführten Luft stark vermindert werden kann. Diese Aufgabe wird mit dem in Patentanspruch 1 definierten Verfahren gelöst. In einer Weiterausbildung des Verfahrens wird der Giessvorhang zusätzlich stabilisiert, indem dem Raum vor dem Giessvorhang kontrolliert Luft zu- und wieder abgeführt wird.Based on this prior art, it is an object of the present invention to provide a method and a device for curtain coating with which the influence of the air carried by the moving carrier can be greatly reduced. This object is achieved with the method defined in claim 1. In a further development of the process, the pouring curtain is additionally stabilized in that controlled air is supplied to and removed from the space in front of the pouring curtain.

Die Erfindung wird im folgenden anhand einer Zeichnung eines Ausführungsbeispiels näher erläutert.

Fig. 1
zeigt schematisch einen Schnitt durch eine Vorhangsbeschichtungsanlage und
Fig. 2
zeigt eine Ausschnittsvergrösserung von Fig. 1.
The invention is explained below with reference to a drawing of an embodiment.
Fig. 1
shows schematically a section through a curtain coating system and
Fig. 2
shows an enlarged detail of FIG. 1.

Figur 1 zeigt den erfindungswesentlichen Teil einer Beschichtungsanlage im Schnitt mit einem schematisch dargestellten Giesser 1, der in eine Giesserlippe 2 mündet, von welcher der Flüssigkeitsfilm 3, im folgenden Vorhang genannt, frei in Richtung Giesswalze 4 fällt, auf der schematisch der Träger 5 aufgezeichnet ist, der sich in Richtung des Pfeiles bewegt, siehe auch Figur 2. Der Vorhang wird beidseitig durch Seitenführungen 6 begrenzt.Figure 1 shows the part of a coating system essential to the invention in section with a schematically illustrated pourer 1, which opens into a pouring lip 2, from which the liquid film 3, hereinafter called the curtain, falls freely in the direction of the casting roller 4, on which the carrier 5 is schematically recorded , which moves in the direction of the arrow, see also FIG. 2. The curtain is delimited on both sides by side guides 6.

Vor dem Vorhang, in einem Abstand b, siehe Figur 2, ist ein Rakel 7 angeordnet, dessen zum Vorhang gerichtete Vorderfront 8 in diesem Beispiel nicht parallel zum Vorhang angeordnet ist, sondern nach oben hin einen etwas grösseren Abstand aufweist als bei der Giesswalze. Bei einer Maschinenbreite von ca. 1,5 m stellen sich hohe Anforderungen an die Biegesteifigkeit der beiden Elemente Giesswalze und Rakel. Das Rakel muss deshalb als Träger mit einer genügenden Höhe und damit hohem Flächenträgheitsmoment ausgebildet werden. Aus den Figuren 1 oder 2 geht hervor, dass das Rakel auf der Giesswalzenseite 13 etwa parallel zur Oberfläche der Giesswalze, respektive des Trägers geformt ist und in einen Unterteil 14 übergeht, der etwa rechtwinklig zur Giesswalzenoberfläche verläuft. Die hintere Fläche 15 des Rakels verläuft parallel zur Frontseite der Basis 16 bzw. zu den einzelnen Giesserplatten des Giessers 1.A doctor blade 7 is arranged in front of the curtain, at a distance b, see FIG. With a machine width of approx. 1.5 m, high demands are placed on the bending stiffness of the two elements, the casting roll and doctor blade. The squeegee must therefore be a carrier with a sufficient height and thus high Area moment of inertia are formed. It can be seen from FIGS. 1 or 2 that the doctor blade on the casting roll side 13 is shaped approximately parallel to the surface of the casting roll or the carrier and merges into a lower part 14 which runs approximately at right angles to the casting roll surface. The rear surface 15 of the doctor blade runs parallel to the front of the base 16 or to the individual foundry plates of the foundry 1.

Die mit dem Träger mitlaufende Luft, dargestellt als Grenzschicht 25, siehe Figur 2, wird beim Auftreffen des Vorhanges im Bereich der dynamischen Benetzungslinie 26 durch den auftreffenden Flüssigkeitsfilm vollständig zurückgehalten. Dieser Vorgang kann Störungen erzeugen, z.B. Deformationen im Vorhang die zu einer verminderten Begussqualität führen. Mit dem Rakel wird ein möglichst grosser Anteil der mitgeführten Luft von der dynamischen Auftrefflinie 26 ferngehalten, wobei diese Störungen durch folgende Massnahmen weiter reduziert werden können:

  • a) Abstand a Rakel/Träger klein halten und
  • b) Abstand b Rakel/dynamische Benetzungslinie des Vorhanges ebenfalls klein halten.
The air traveling with the carrier, shown as boundary layer 25, see FIG. 2, is completely retained by the impinging liquid film when the curtain strikes in the region of the dynamic wetting line 26. This process can produce disturbances, for example deformations in the curtain which lead to a reduced quality of the casting. The squeegee keeps as large a portion of the air as possible away from the dynamic impact line 26, whereby these disturbances can be further reduced by the following measures:
  • a) Keep the distance a squeegee / carrier small and
  • b) Also keep the distance b squeegee / dynamic wetting line of the curtain small.

Dadurch wird die Dicke c der Grenzschicht 25, die auf den Vorhang aufprallt, minimalisiert. Doch selbst wenn man den Abstand a Rakel/Träger, siehe Figur 2, sehr klein hält, beispielsweise 0,1 - 1,0 mm, vorzugsweise 0,1 - 0,5 mm und den Abstand b Rakel/dynamische Benetzungslinie auf 5 - 30 mm, vorzugsweise 10 - 20 mm einstellt, kann das Eintragen einer Restluftmenge und die Neubildung der Grenzschicht nicht ganz vermieden werden.This minimizes the thickness c of the boundary layer 25 that impacts the curtain. However, even if the distance a doctor / carrier, see FIG. 2, is kept very small, for example 0.1-1.0 mm, preferably 0.1-0.5 mm, and the distance b doctor / dynamic wetting line is 5-30 mm, preferably 10-20 mm, the entry of a residual air quantity and the formation of the boundary layer cannot be completely avoided.

Um das Eintragen der Restluftmenge praktisch vollständig zu verhindern, ist auf der vollen Länge des Rakels ein Schlitz 17 angeordnet, dessen Mündung sich unmittelbar hinter der Vorderkante des Rakels befindet. Der Schlitz 17 ist über einen Kanal 18 mit einem Ventilator 19 verbunden, um die Restluftmenge bei der Rakelvorderkante abzusaugen. Durch diese Massnahme kann eine wesentliche Beruhigung des Vorhanges beim Auftreffen auf den bewegten Träger erzielt werden, wodurch eine Beseitigung oder starke Verminderung der dort vorherrschenden Vorhangdeformation erzielt wird.There is a slot along the full length of the squeegee to prevent the amount of residual air from entering almost completely 17 arranged, the mouth of which is located immediately behind the front edge of the squeegee. The slot 17 is connected via a duct 18 to a fan 19 in order to draw off the residual air quantity at the leading edge of the doctor blade. As a result of this measure, the curtain can be considerably calmed down when it strikes the moving support, as a result of which the curtain deformation prevailing there is eliminated or greatly reduced.

Das Gebiet vor dem Vorhang wird oben durch die Unterseite 9 der Giesserlippe 2, unten durch den Träger 5, gegenüber dem Vorhang durch die Frontseite 8 des Rakels, und beidseitig durch die Seitenführungen 6 begrenzt und stellt sich daher als praktisch geschlossener Raum 10 dar. Ohne besondere Massnahmen würden durch die Luftgrenzschicht 11 entlang des fallenden Vorhanges, siehe Figur 2, rotierende Luftwirbel 12 entstehen, die sich in einzelne instabile Zellen aufteilen können. Dadurch wird der Fluss des Vorhanges gestört und unruhig, was zu einer verminderten Begussqualität führt.The area in front of the curtain is delimited at the top by the underside 9 of the pouring lip 2, at the bottom by the support 5, opposite the curtain by the front 8 of the doctor blade, and on both sides by the side guides 6 and is therefore a practically closed space 10 Special measures would arise from the air boundary layer 11 along the falling curtain, see FIG. 2, rotating air vortices 12, which can be divided into individual unstable cells. As a result, the flow of the curtain is disturbed and restless, which leads to a reduced casting quality.

Um die Entstehung von Luftwirbeln 12 zu verhindern, ist zwischen der hinteren Oberkante 20 des Rakels und der vordersten Giesserplatte 21 eine über die ganze Breite der Maschine verlaufende Oeffnung 22 vorgesehen, die mit einem zweiten Kanal 23 und mit einem zweiten Ventilator 24 verbunden ist. Die Luftzufuhr-Oeffnung 22 mündet bei der Unterseite 9 der Giesserlippe 2, so dass die dort mit geringer Geschwindigkeit ankommende Luft nach unten abgelenkt und schliesslich vom Saugrakel, bzw. dessen Schlitz 17 abgesaugt wird.In order to prevent the formation of air vortices 12, an opening 22 extending over the entire width of the machine is provided between the rear upper edge 20 of the doctor blade and the foremost foundry plate 21, which opening is connected to a second duct 23 and to a second fan 24. The air supply opening 22 opens at the bottom 9 of the pouring lip 2, so that the air arriving there at a low speed is deflected downward and is finally sucked off by the squeegee or its slot 17.

Durch verschiedene Massnahmen kann eine sehr gleichmässige Strömung erzeugt werden, wobei die zugeführte Luft vorzugsweise vorgewärmt wird. Mit den entsprechenden Einstellungen der zugeführten und der abgesaugten Luftmenge kann die Auftrefflinie des Vorhanges auf dem Träger, die dynamische Benetzungslinie 26, am gewünschten Ort eingestellt werden. Da das Saugrakel, wie weiter oben erläutert, für eine Stabilisierung der dynamischen Benetzungslinie sorgt, wird durch eine Kombination der beschriebenen Massnahmen eine gleichmässige Beschichtung erzielt. Dabei können die Luftabsaug- und Zufuhreinrichtungen zu einer Einheit zusammengefasst und gesteuert werden.A very uniform flow can be generated by various measures, the air supplied preferably being preheated. With the appropriate settings for the supplied and extracted air volume the line of impact of the curtain on the carrier, the dynamic wetting line 26, can be set at the desired location. Since the squeegee, as explained above, stabilizes the dynamic wetting line, a combination of the measures described achieves a uniform coating. The air extraction and supply devices can be combined and controlled into one unit.

Claims (11)

Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial, insbesondere photographische Emulsionen, dadurch gekennzeichnet, dass, in Laufrichtung des Trägers gesehen, die vom bewegten Träger mitgeführte Luft vor dem Vorhang, bei der dynamischen Benetzungslinie des Vorhanges und in der Nähe des Trägers auf der Giesswalze direkt mittels einer Absaugvorrichtung abgesaugt wird, wobei die Mündung der Absaugöffnung bei der Vorderkante der Absaugvorrichtung angeordnet ist.Method for curtain coating a moving support with a liquid coating material, in particular photographic emulsions, characterized in that, seen in the direction of travel of the support, the air carried by the moving support in front of the curtain, at the dynamic wetting line of the curtain and in the vicinity of the support on the Casting roller is sucked off directly by means of a suction device, the mouth of the suction opening being arranged at the front edge of the suction device. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Luft auf der ganzen Breite des Trägers abgesaugt wird.A method according to claim 2, characterized in that the air is extracted over the entire width of the carrier. Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial, dadurch gekennzeichnet, dass, in Laufrichtung des Trägers gesehen, dem Raum vor dem Giessvorhang kontrolliert Luft stetig zu- und abgeführt wird.Process for coating a moving support with a liquid coating material, characterized in that, when viewed in the direction of travel of the support, air is supplied and removed continuously from the space in front of the casting curtain. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die zugeführte Luft vorgewärmt ist.A method according to claim 3, characterized in that the supplied air is preheated. Verfahren nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die zu- und abgeführte Luftmenge gesteuert wird, um den Ort der dynamischen Benetzungslinie des Vorhanges auf dem Träger einzustellen.A method according to claim 3 or 4, characterized in that the amount of air supplied and removed is controlled to adjust the location of the dynamic wetting line of the curtain on the support. Verfahren nach Anspruch 1 und 3, dadurch gekennzeichnet, dass die zugeführte Luft durch die Absaugvorrichtung abgeführt wird.A method according to claim 1 and 3, characterized in that the supplied air is discharged through the suction device. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einem Giesser (1) mit Giesserlippe (2) und einer Giesswalze (4) zur Führung eines Trägers (5), dadurch gekennzeichnet, dass die Vorrichtung eine vor dem Vorhang (3) angeordnete Absaugvorrichtung aufweist, die einen Saugrakel (7) enthält, dessen zum Vorhang (3) gerichtete Vorderkante (8) einen Schlitz (17) aufweist, der mit einer Unterdruckanlage verbunden ist.Device for performing the method according to claim 1 with a pourer (1) with pouring lip (2) and a casting roller (4) for guiding a carrier (5), characterized in that the device has a suction device arranged in front of the curtain (3), which contains a squeegee (7), the front edge (8) of which is directed towards the curtain (3) Has slot (17) which is connected to a vacuum system. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Mündung des Schlitzes (17) nahe der Oberfläche des Trägers (5) und der dynamischen Benetzungslinie (26) des Vorhanges (3) angeordnet ist.Device according to claim 7, characterized in that the mouth of the slot (17) is arranged close to the surface of the support (5) and the dynamic wetting line (26) of the curtain (3). Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass der Abstand a der Mündung des Schlitzes (17) zur Oberfläche des Trägers auf der Giesswalze 0,1 - 1,0 mm, vorzugsweise 0,1 - 0,5 mm und der Abstand b der Mündung des Schlitzes (17) zur dynamischen Benetzungslinie (26) 5 - 30 mm, vorzugsweise 10 - 20 mm beträgt.Apparatus according to claim 8, characterized in that the distance a from the mouth of the slot (17) to the surface of the carrier on the casting roll 0.1-1.0 mm, preferably 0.1-0.5 mm and the distance b of the mouth of the slot (17) to the dynamic wetting line (26) is 5 - 30 mm, preferably 10 - 20 mm. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 7, mit einem aus der Giesserplatte (21) gebildeten Giesser (1) mit Giesserlippe (2) und einer Giesswalze (4) zur Führung eines Trägers (5), dadurch gekennzeichnet, dass bei der vordersten Giesserplatte (21), unterhalb der Giesserlippe (2) eine parallel zum Vorhang (3) angeordnete Oeffnung (22) vorhanden ist, die mit einer Luftzufuhreinrichtung verbunden ist,Device for carrying out the method according to claim 7, with a pourer (1) formed from the pouring plate (21) with pouring lip (2) and a pouring roller (4) for guiding a carrier (5), characterized in that in the foremost pouring plate ( 21), below the pouring lip (2) there is an opening (22) which is arranged parallel to the curtain (3) and which is connected to an air supply device, Vorrichtung nach einem der Ansprüche 7 bis 10, dadurch gekennzeichnet, dass die Oeffnung (22) durch einen Spalt zwischen der dem Vorhang abgewandten hinteren Fläche (15) des Saugrakels (7) und der Vorderseite der vordersten Giesserplatte (21) gebildet wird.Device according to one of claims 7 to 10, characterized in that the opening (22) is formed by a gap between the rear surface (15) of the suction doctor (7) facing away from the curtain and the front of the foremost foundry plate (21).
EP94810560A 1994-09-27 1994-09-27 Process and apparatus for curtain-coating a moving substrate. Expired - Lifetime EP0704752B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE59409768T DE59409768D1 (en) 1994-09-27 1994-09-27 Method and device for curtain coating of a moving support
EP94810560A EP0704752B1 (en) 1994-09-27 1994-09-27 Process and apparatus for curtain-coating a moving substrate.
JP24955595A JP3681443B2 (en) 1994-09-27 1995-09-27 Method and apparatus for curtain-like coating on moving support
US08/534,842 US5624715A (en) 1994-09-27 1995-09-27 Method and apparatus for curtain coating a moving support

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94810560A EP0704752B1 (en) 1994-09-27 1994-09-27 Process and apparatus for curtain-coating a moving substrate.

Publications (2)

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EP0704752A1 true EP0704752A1 (en) 1996-04-03
EP0704752B1 EP0704752B1 (en) 2001-05-30

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EP94810560A Expired - Lifetime EP0704752B1 (en) 1994-09-27 1994-09-27 Process and apparatus for curtain-coating a moving substrate.

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US (1) US5624715A (en)
EP (1) EP0704752B1 (en)
JP (1) JP3681443B2 (en)
DE (1) DE59409768D1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
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EP0906789A1 (en) * 1997-10-03 1999-04-07 Troller Schweizer Engineering AG Process and apparatus for curtain coating of a travelling support
EP0938935A2 (en) 1998-02-27 1999-09-01 Agfa-Gevaert AG Curtain coating apparatus
WO2001091917A1 (en) 2000-06-02 2001-12-06 Mitsubishi Hitec Paper Flensburg Gmbh Method and device for curtain coating
WO2006056386A1 (en) 2004-11-22 2006-06-01 Basf Aktiengesellschaft Arrangement and method for curtain coating moving substrates
WO2006134052A1 (en) 2005-06-15 2006-12-21 Basf Aktiengesellschaft Curtain coater with boundary layer detachment device
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US20070045896A1 (en) * 2005-08-31 2007-03-01 Fuji Photo Film Co., Ltd. Method and apparatus for producing film
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EP0938935A3 (en) * 1998-02-27 2000-05-03 Agfa-Gevaert AG Curtain coating apparatus
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WO2006056386A1 (en) 2004-11-22 2006-06-01 Basf Aktiengesellschaft Arrangement and method for curtain coating moving substrates
WO2006134052A1 (en) 2005-06-15 2006-12-21 Basf Aktiengesellschaft Curtain coater with boundary layer detachment device
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JPH08173879A (en) 1996-07-09
US5624715A (en) 1997-04-29
JP3681443B2 (en) 2005-08-10
EP0704752B1 (en) 2001-05-30
DE59409768D1 (en) 2001-07-05

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