EP0740197A1 - Process and apparatus for curtain-coating a moving substrate - Google Patents

Process and apparatus for curtain-coating a moving substrate Download PDF

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Publication number
EP0740197A1
EP0740197A1 EP95810277A EP95810277A EP0740197A1 EP 0740197 A1 EP0740197 A1 EP 0740197A1 EP 95810277 A EP95810277 A EP 95810277A EP 95810277 A EP95810277 A EP 95810277A EP 0740197 A1 EP0740197 A1 EP 0740197A1
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EP
European Patent Office
Prior art keywords
curtain
knife
edge
plates
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.)
Granted
Application number
EP95810277A
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German (de)
French (fr)
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EP0740197B1 (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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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8221736&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0740197(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Ilford AG, Ilford Imaging Switzerland GmbH filed Critical Ilford AG
Priority to EP19950810277 priority Critical patent/EP0740197B1/en
Priority to EP98100164A priority patent/EP0841588B1/en
Priority to EP98100165A priority patent/EP0841589B1/en
Priority to DE59506354T priority patent/DE59506354D1/en
Publication of EP0740197A1 publication Critical patent/EP0740197A1/en
Application granted granted Critical
Publication of EP0740197B1 publication Critical patent/EP0740197B1/en
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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
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/30—Processes for applying liquids or other fluent materials performed by gravity only, i.e. flow coating
    • B05D1/305—Curtain coating

Definitions

  • the present invention relates to a method and a device for curtain coating a moving support with a liquid coating material according to the preamble of claim 1.
  • This coating in particular with a large width of the machine and high speed, there are a large number of problems relating to the curtain stabilize and bring it onto the surface as evenly as possible.
  • One of these problems is that when the curtain falls freely, it has to be stabilized on the side, otherwise the curtain contracts under the effect of the surface tension towards the center.
  • One of these means is to provide side guides, but the friction of the liquid film on the side guide creates an unfavorable speed profile at the edge of the curtain because the speed of the curtain is zero on the side guide.
  • a method for curtain coating in which the rinsing liquid is drawn off from the edges of the falling curtain, the edge guides near the point where the falling curtain hits the support with a Vacuum source are connected.
  • the edge guides consist of hollow tubes, each of which has a slot facing the curtain, the rinsing liquid being introduced into the interior of the tubes and passing through the slots into the edge regions of the curtain.
  • the curtain even if it is forced into the vertical case by rod-shaped side guides, can be deformed immediately next to it, for example by existing surface tension differences, in such a way that it can fall onto rear wall parts, which leads to serious contamination and malfunctions can.
  • EP-A-606 038 also discloses a device for removing the curtain edges with plates working as knives, the plates being arranged parallel to the curtain and the curtain edge being suctioned off there.
  • the height of these knives is very small and there is a risk that part of the coating solution gets under the entire device, which leads to contamination.
  • the problem of the thickened edge is not solved there.
  • a second object of the present invention is to provide a method and a device with which a uniform coating with clean edges can be achieved without substantial loss of material.
  • This second object is achieved with the method according to independent patent claims 3 and 9. Further advantages are defined in independent claim 4 and in the dependent claims.
  • FIG. 1 part of a coating device is shown schematically as part of a system.
  • the pouring plates 1 can be seen, see also FIG. 4, with the side limiting plates 2 attached to the side, with which the pouring solution 3 is limited for the respective pouring width.
  • the free fall of the curtain begins on the lip 4 of the foundry front plate 5. From this point on, the curtain 6 must be stabilized by the side guides 7. Without these side guides, the curtain would contract towards the center under the effect of surface tension.
  • the unfavorable speed profile in the side guides is influenced by the fact that a liquid film, for example made of water or a water / gelatin solution, is introduced on both sides of the curtain in order to reduce the edge effect.
  • a liquid film for example made of water or a water / gelatin solution
  • this liquid film has a certain width and is then separated and drained off from the casting solution curtain by means of a device. This is done here with an outward-facing plate over which water flows and which drains the rinsing liquid and part of the curtain liquid into an area to the side outside of the casting roll.
  • the coating device also has a carrier 8 to be coated, which is guided around the casting roll 9 and under the coating device. The direction of rotation of the casting roll is also shown in FIG.
  • the side-limiting liquid film is no longer introduced parallel to the casting solution or the casting curtain, but rather transversely thereto, that is, see in particular FIG. 3, the liquid film 10 is introduced parallel to the flow-limiting front wall 7 ′ of the side guide 7, the liquid film 10 flows in a groove 14 in the side guide and forms part of the front wall of the side guide.
  • the liquid for example water or a water / gelatin solution, is introduced through a metering slot 11, the slot end 12 being shaped in such a way that the liquid film 10 flows down the groove in the side guide regularly and with a uniform thickness.
  • a knife 15 is attached, the outer geometry of which is known per se.
  • this knife also has a front edge 16 which forms an acute angle ⁇ of 0-30 °, for example 10 °, with respect to the inside of the side guide.
  • a suction slot 18 is arranged in the side guide, the height of which is 0.05-0.5 mm, see FIG. 2.
  • This slot 18 is connected via a suction channel 19 to a fan or other vacuum system in order to prevent the cut off the curtain edge and the liquid film 10.
  • a few mm of the curtain are cut off with the knife 15. Sucking off the liquid film and the edge of the curtain significantly stabilize the curtain.
  • the gelatin is thinned and thus the incrustation of the suction paths is prevented.
  • a suction slot 20 is arranged on the lower edge of the knife, which is connected via a channel 21 to a vacuum system which is the same as for the suction slot 18 can be.
  • This channel preferably also contains a water rinse. As shown in Figure 2, this creates an edge of the coating 22 that can be used without loss.
  • the knife height on the cutting edge S of the knife can be 1-15 mm and it is advisable to use the suction slit from a knife height of 3 mm, whereas with a knife height of 1-3 mm there is no need for a suction slit.
  • the delimiting edge 25 of the side delimitation plates is not vertical, but has a cutting edge 24, this cutting edge enclosing an angle of, for example, 60 °, that is to say that the two edges of the cutting edge unite with the perpendicular to the coating 22 Have angles ⁇ and ⁇ of 10 - 80 °, preferably 60 °.
  • the distance H between the cutting edge 24 and the surface of the foundry plates is 0.3-2.5 mm, preferably 0.8 mm. This minimizes the effect of surface tension reduced, and lateral displacements of the casting solution are largely avoided.
  • the device according to the invention can be varied with respect to the stated mass and can be adapted to the most varied of coating conditions and casting solution combinations. While every single measure already leads to extensive improvements in terms of the quality of the coating, a combination of all improvements results, such as vacuuming off the cut edges, vacuuming off the casting solution jammed with the knife and avoiding the layer thickness differences caused by the surface tension, and guiding a thin liquid film along the side boundary plates a particularly stable coating, the edges of which no longer cause material loss or drying problems.

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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 curtain is formed by liquid material, particularly photographic emulsions. A lateral current (10) is fed to the curtain (6) on both sides, the curtain width being greater than that of the coating on the support. The current is delivered to the curtain in the latter's transverse direction, and parallel to the front wall (7) of the lateral guides. Where the curtain side edges are trimmed off by knives, the offcuts can be extracted via a suction slot (18) and passage (19). The leading edge of each knife can slope inwards, and to avoid formation of a beaded edge any accumulated solution can be extracted via suction ports in the knife.

Description

Die vorliegende Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial gemäss Oberbegriff von Patentanspruch 1. Bei dieser Beschichtung, insbesondere bei grosser Breite der Maschinen und grosser Geschwindigkeit ergeben sich eine grosse Anzahl von Problemen, um den Vorhang zu stabilisieren und möglichst gleichmässig auf die Unterlage zu bringen.The present invention relates to a method and a device for curtain coating a moving support with a liquid coating material according to the preamble of claim 1. With this coating, in particular with a large width of the machine and high speed, there are a large number of problems relating to the curtain stabilize and bring it onto the surface as evenly as possible.

Eines dieser Probleme besteht darin, dass beim freien Fall des Vorhanges dieser seitenstabilisiert werden muss, ansonsten sich der Vorhang unter der Wirkung der Oberflächenspannung gegen die Mitte zusammenzieht. Eines dieser Mittel besteht darin, Seitenführungen vorzusehen, wobei jedoch die Reibung des Flüssigkeitsfilmes an der Seitenführung ein ungünstiges Geschwindigkeitsprofil an der Randzone des Vorhanges erzeugt, da an der Seitenführung die Geschwindigkeit des Vorhanges Null ist.One of these problems is that when the curtain falls freely, it has to be stabilized on the side, otherwise the curtain contracts under the effect of the surface tension towards the center. One of these means is to provide side guides, but the friction of the liquid film on the side guide creates an unfavorable speed profile at the edge of the curtain because the speed of the curtain is zero on the side guide.

Aus der EP-B-414 721 ist ein Verfahren zur Vorhang-Beschichtung bekannt, bei der die Spülflüssigkeit von den Kanten des herabfallenden Vorhanges abgesaugt wird, wobei die Kantenführungen in der Nähe der Stelle, wo der herabfallende Vorhang auf den Träger auftrifft, mit einer Unterdruckquelle verbunden sind. Dabei bestehen die Kantenführungen aus hohlen Rohren, die jeweils einen dem Vorhang zugewandten Schlitz aufweisen, wobei die Spülflüssigkeit in das Innere der Rohre eingeleitet wird und aus diesen durch die Schlitze hindurch in die Randbereiche des Vorhangs gelangt. Dieses Verfahren ergibt keine scharfe Kante, da die Berührungslinie zwischen Vorhang und Seitenfluss nicht ortsstabil ist und somit die Qualität der Beschichtung beeinträchtigt wird. Bei der in der EP-A-606 038 beschriebenen Lösung kann der Vorhang, selbst wenn er durch stabförmige Seitenführungen in den senkrechten Fall gezwungen wird, unmittelbar daneben durch beispielsweise vorhandene Oberflächenspannungsdifferenzen derart deformiert werden, dass er auf Rückwandteile fallen kann, was zu schweren Verschmutzungen und Störungen führen kann.From EP-B-414 721 a method for curtain coating is known, in which the rinsing liquid is drawn off from the edges of the falling curtain, the edge guides near the point where the falling curtain hits the support with a Vacuum source are connected. The edge guides consist of hollow tubes, each of which has a slot facing the curtain, the rinsing liquid being introduced into the interior of the tubes and passing through the slots into the edge regions of the curtain. This method does not result in a sharp edge, since the line of contact between the curtain and the side flow is not stable and the quality of the coating is thus impaired. At the in In the solution described in EP-A-606 038, the curtain, even if it is forced into the vertical case by rod-shaped side guides, can be deformed immediately next to it, for example by existing surface tension differences, in such a way that it can fall onto rear wall parts, which leads to serious contamination and malfunctions can.

Es ist von diesem Stand der Technik ausgehend eine erste Aufgabe der Erfindung, ein Verfahren und eine Vorrichtung anzugeben, bei dem die Ränder des Vorhanges möglichst ungestört fallen und wichtige Anlageteile sowie der beschichtete Träger nicht verschmutzt werden und eine gleichmässige Beschichtung erzielt wird. Diese Aufgabe wird mit den unabhängigen Patentansprüche 1 und 6 gelöst.Starting from this prior art, it is a first object of the invention to provide a method and a device in which the edges of the curtain fall as undisturbed as possible and important system parts and the coated support are not soiled and a uniform coating is achieved. This object is achieved with independent claims 1 and 6.

In der EP-B-281 520 wird der Spülflüssigkeitsfilm zusammen mit dem durch ein Messer abgeschnittenen Vorhangrand weggeleitet. Dabei steht die Vorderkante des Messers mit einem Winkel α nach Innen. Dies bewirkt jedoch, dass die Randzone des Vorhanges komprimiert und auf der Beschichtung ein Randwulst erzeugt wird. Dieser Randwulst ist eine unerwünschte Störung, die zu Materialverlusten und Trocknungsproblemen führt.In EP-B-281 520 the rinsing liquid film is led away together with the curtain edge cut off by a knife. The front edge of the knife is at an angle α inwards. However, this has the effect that the edge zone of the curtain is compressed and an edge bead is produced on the coating. This bead is an undesirable disturbance, which leads to material loss and drying problems.

Aus der EP-A-606 038 ist ausserdem eine Vorrichtung zur Entfernung der Vorhangränder mit als Messer arbeitende Platten bekannt, wobei die Platten parallel zum Vorhang angeordnet sind und der Vorhangrand dort abgesaugt wird. Die Höhe dieser Messer ist sehr klein und es besteht die Gefahr, dass ein Teil der Beschichtungslösung unter die ganze Vorrichtung gelangt, was zu Verschmutzungen führt. Ausserdem wird dort das Problem des verdickten Randes nicht gelöst.EP-A-606 038 also discloses a device for removing the curtain edges with plates working as knives, the plates being arranged parallel to the curtain and the curtain edge being suctioned off there. The height of these knives is very small and there is a risk that part of the coating solution gets under the entire device, which leads to contamination. In addition, the problem of the thickened edge is not solved there.

Es ist demgegenüber eine zweite Aufgabe der vorliegenden Erfindung ein Verfahren und eine Vorrichtung anzugeben, mit dem eine gleichmässige Beschichtung mit sauberen Kanten ohne wesentlichen Materialverlust erzielt werden kann. Diese zweite Aufgabe wird mit dem Verfahren gemäss den unabhängigen Patentansprüchen 3 und 9 gelöst. Weitere Vorteile sind im unabhängigen Anspruch 4 und in den abhängigen Ansprüchen definiert.In contrast, a second object of the present invention is to provide a method and a device with which a uniform coating with clean edges can be achieved without substantial loss of material. This second object is achieved with the method according to independent patent claims 3 and 9. Further advantages are defined in independent claim 4 and in the dependent claims.

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

  • Fig. 1 zeigt in perspektivischer Sicht und schematisch einen Teil einer Vorhangsbeschichtungsanlage,
  • Fig. 2 zeigt in einem Längsschnitt die wesentlichen Teile der erfindungsgemässen Vorrichtung,
  • Fig. 3 ist ein Schnitt gemäss der Linie III-III in Fig. 2,
  • Fig. 4 zeigt in perspektivischer Sicht ein Detail der erfindungsgemässen Vorrichtung, und
  • Fig. 5 zeigt einen Schnitt gemäss der Linie V-V.
The invention is explained below with reference to a drawing of an embodiment.
  • 1 shows a perspective view and schematically a part of a curtain coating system,
  • 2 shows in a longitudinal section the essential parts of the device according to the invention,
  • 3 is a section along the line III-III in FIG. 2,
  • 4 shows a perspective view of a detail of the device according to the invention, and
  • Fig. 5 shows a section along the line VV.

In Figur 1 ist schematisch ein Teil einer Beschichtungs-Vorrichtung als Teil einer Anlage dargestellt. Man erkennt die Giesserplatten 1, siehe auch Figur 4, mit den seitlich angebrachten Seitenbegrenzungsplatten 2, womit die Giesslösung 3 für die jeweilige Giessbreite begrenzt wird. An der Lippe 4 der Giesserfrontplatte 5 beginnt der freie Fall des Vorhanges. Von diesem Punkt an muss der Vorhang 6 durch die Seitenführungen 7 stabilisiert werden. Ohne diese Seitenführungen würde sich der Vorhang unter der Wirkung der Oberflächenspannung gegen die Mitte zusammenziehen.In Figure 1, part of a coating device is shown schematically as part of a system. The pouring plates 1 can be seen, see also FIG. 4, with the side limiting plates 2 attached to the side, with which the pouring solution 3 is limited for the respective pouring width. The free fall of the curtain begins on the lip 4 of the foundry front plate 5. From this point on, the curtain 6 must be stabilized by the side guides 7. Without these side guides, the curtain would contract towards the center under the effect of surface tension.

Wie bereits eingangs erwähnt, wird das ungünstige Geschwindigkeitsprofil bei den Seitenführungen dadurch beeinflusst, dass beidseitig des Vorhanges ein Flüssigkeitsfilm, beispielsweise aus Wasser oder einer Wasser/Gelatinelösung eingeführt wird, um den Randeffekt zu vermindern. Bei bekannten derartigen Vorrichtungen, zum Beispiel gemäss der WO 90/01179, weist dieser Flüssigkeitsfilm eine gewisse Breite auf und wird dann mittels einer Vorrichtung vom Giesslösungsvorhang abgetrennt und abgeleitet. Dies geschieht hier mit einer nach aussen gerichteten und mit Wasser überströmten Platte, welche die Spülflüssigkeit und einen Teil der Vorhangflüssigkeit in einen Bereich seitlich ausserhalb der Giesswalze ableitet. Dadurch wird jedoch die Flexibilität bezüglich unterschiedlichen Trägerbreiten stark eingeschränkt.As already mentioned at the beginning, the unfavorable speed profile in the side guides is influenced by the fact that a liquid film, for example made of water or a water / gelatin solution, is introduced on both sides of the curtain in order to reduce the edge effect. In known devices of this type, for example in accordance with WO 90/01179, this liquid film has a certain width and is then separated and drained off from the casting solution curtain by means of a device. This is done here with an outward-facing plate over which water flows and which drains the rinsing liquid and part of the curtain liquid into an area to the side outside of the casting roll. However, this severely limits the flexibility with regard to different beam widths.

Die Beschichtungsvorrichtung weist ferner einen zu beschichtenden Träger 8 auf, der um die Giesswalze 9 und unter der Beschichtungsvorrichtung geführt wird. In Figur 1 ist auch der Drehsinn der Giesswalze eingezeichnet.The coating device also has a carrier 8 to be coated, which is guided around the casting roll 9 and under the coating device. The direction of rotation of the casting roll is also shown in FIG.

Bei der erfindungsgemässen Vorrichtung wird der seitenbegrenzende Flüssigkeitsfilm nicht mehr parallel zur Giesslösung, bzw. zum Giessvorhang eingeleitet, sondern quer dazu, das heisst, siehe insbesondere Figur 3, der Flüssigkeitsfilm 10 wird parallel zur strömungsbegrenzenden Vorderwand 7' der Seitenführung 7 eingeleitet, wobei der Flüssigkeitsfilm 10 in einer Nut 14 in der Seitenführung fliesst und einen Teil der Vorderwand der Seitenführung bildet. Wie aus Figur 2 hervorgeht, wird die Flüssigkeit, beispielsweise Wasser oder eine Wasser/Gelatinelösung, durch einen Dosierschlitz 11 eingeführt, wobei das Schlitzende 12 derart geformt ist, dass der Flüssigkeits-Film 10 regelmässig und mit gleichförmiger Dicke die Nut in der Seitenführung hinabströmt.In the device according to the invention, the side-limiting liquid film is no longer introduced parallel to the casting solution or the casting curtain, but rather transversely thereto, that is, see in particular FIG. 3, the liquid film 10 is introduced parallel to the flow-limiting front wall 7 ′ of the side guide 7, the liquid film 10 flows in a groove 14 in the side guide and forms part of the front wall of the side guide. As can be seen from FIG. 2, the liquid, for example water or a water / gelatin solution, is introduced through a metering slot 11, the slot end 12 being shaped in such a way that the liquid film 10 flows down the groove in the side guide regularly and with a uniform thickness.

Dadurch wird erreicht, dass der Flüssigkeitsfilm und damit auch die Berührungslinie 13 zwischen Giessvorhang 6 und Flüssigkeitsfilm 10 ortsstabil ist, womit unkontrollierte wellenförmige Bewegungen im Vorhang vermieden werden. Zum Flüssigkeitsfilm können Zusätze wie Netzmittel und/oder Substanzen zur Erhöhung der elektrischen Leitfähigkeit beigegeben werden.It is thereby achieved that the liquid film and thus also the line of contact 13 between the pouring curtain 6 and the liquid film 10 is stable in place, thus avoiding uncontrolled undulating movements in the curtain. Additives such as wetting agents and / or substances to increase the electrical conductivity can be added to the liquid film.

Am unteren Ende der Seitenführungen ist je ein Messer 15 angebracht, dessen äussere Geometrie an sich bekannt ist. Insbesondere weist auch dieses Messer, um Strömungs-Ablösungen zu vermeiden, eine Vorderkante 16 auf, die bezüglich der Innenseite der Seitenführung einen spitzen Winkel α von 0 - 30°, beispielsweise 10° bildet.At the lower end of the side guides a knife 15 is attached, the outer geometry of which is known per se. In particular, in order to avoid flow separation, this knife also has a front edge 16 which forms an acute angle α of 0-30 °, for example 10 °, with respect to the inside of the side guide.

An der Oberseite 17 des Messers ist in der Seitenführung ein Absaugschlitz 18 angeordnet, dessen Höhe 0,05 - 0,5 mm beträgt, siehe Fig. 2. Dieser Schlitz 18 ist über einen Absaugkanal 19 mit einem Ventilator oder sonstigen Unterdruckanlage verbunden, um den abgeschnittenen Vorhangrand sowie den Flüssigkeitsfilm 10 abzusaugen. Dabei werden mit dem Messer 15 einige mm des Vorhanges abgeschnitten. Das Absaugen des Flüssigkeitsfilms sowie des Vorhangrandes bewirkt eine wesentliche Stabilisierung des Vorhanges. Durch das gleichzeitige Absaugen des meistens aus Wasser bestehenden Flüsigkeitsfilms mit der Gelatine enthaltenden Vorhangflüssigkeit wird eine Verdünnung der Gelatine erzielt und damit eine Verkrustung der Absaugwege verhindert.On the top 17 of the knife, a suction slot 18 is arranged in the side guide, the height of which is 0.05-0.5 mm, see FIG. 2. This slot 18 is connected via a suction channel 19 to a fan or other vacuum system in order to prevent the cut off the curtain edge and the liquid film 10. A few mm of the curtain are cut off with the knife 15. Sucking off the liquid film and the edge of the curtain significantly stabilize the curtain. By simultaneously sucking off the liquid film, which mostly consists of water, with the curtain liquid containing gelatin, the gelatin is thinned and thus the incrustation of the suction paths is prevented.

Um den durch den komprimierten Vorhangrand an der Kante des Saugmessers gebildeten Wulst zu vermeiden, ist an der unteren Kante des Messers ein Saugschlitz 20 angeordnet, der über einen Kanal 21 mit einer Unterdruckanlage verbunden ist, die dieselbe wie für den Absaugschlitz 18 sein kann. Vorzugsweise enthält auch dieser Kanal eine Wasserspülung. Wie in Figur 2 dargestellt, entsteht dadurch ein Rand der Beschichtung 22, der ohne Verlust verwendet werden kann.In order to avoid the bulge formed by the compressed curtain edge on the edge of the suction knife, a suction slot 20 is arranged on the lower edge of the knife, which is connected via a channel 21 to a vacuum system which is the same as for the suction slot 18 can be. This channel preferably also contains a water rinse. As shown in Figure 2, this creates an edge of the coating 22 that can be used without loss.

Die Messerhöhe an der Schneide S des Messers kann 1-15 mm betragen und es ist zweckmässig, den Saugschlitz ab einer Messerhöhe von 3 mm zu verwenden, während bei einer Messerhöhe von 1-3 mm auf einen Absaugschlitz verzichtet werden kann.The knife height on the cutting edge S of the knife can be 1-15 mm and it is advisable to use the suction slit from a knife height of 3 mm, whereas with a knife height of 1-3 mm there is no need for a suction slit.

Weitere Störungen können durch die vor der Giesserlippe angeordneten Seitenbegrenzungsplatten entstehen, so beispielsweise Schichtdickenfehler im Randbereich, dadurch dass die Giesslösung unter der Wirkung der Oberflächen-Spannung an den Seiten der Seitenbegrenzungsplatten in die Höhe steigt, da die vorbekannten Seitenbegrenzungsplatten eine rechtwinklige Stirnseite aufweisen. In Abweichung von diesen vorbekannten Ausführungen werden die Seiten-Begrenzungsplatten 2 der erfindungsgemässen Vorrichtung dicht auf die Giesserplatten 1 montiert, siehe Figuren 4 und 5, so dass sie sämtliche Giesserplatten und auch den Bogen 23 der Giesserfrontplatte 5 bis zur Giesserlippe 4 überdecken.Further disturbances can arise from the side boundary plates arranged in front of the pouring lip, for example layer thickness errors in the edge area, in that the casting solution rises under the effect of the surface tension on the sides of the side boundary plates, since the previously known side boundary plates have a right-angled end face. In deviation from these previously known designs, the side boundary plates 2 of the device according to the invention are mounted tightly on the foundry plates 1, see FIGS. 4 and 5, so that they cover all foundry plates and also the arch 23 of the foundry front plate 5 up to the pouring lip 4.

Aus Figur 5 geht hervor, dass die begrenzende Kante 25 der Seitenbegrenzungsplatten nicht senkrecht ist, sondern eine Schneide 24 aufweist, wobei diese Schneide einen Winkel von biespielsweise 60° einschliesst, das heisst, dass die beiden Kanten der Schneide mit der zur Beschichtung 22 Senkrechten einen Winkel β und Γ von je 10 - 80°, vorzugsweise 60 °, aufweisen. Dabei beträgt der Abstand H zwischen der Schneide 24 und der Oberfläche der Giesserplatten 0,3 - 2,5 mm, vorzugsweise 0,8 mm. Dadurch wird die Wirkung der Oberflächenspannung auf ein Minimum reduziert, und es werden seitliche Verschiebungen der Giesslösung weitgehendst vermieden.It can be seen from FIG. 5 that the delimiting edge 25 of the side delimitation plates is not vertical, but has a cutting edge 24, this cutting edge enclosing an angle of, for example, 60 °, that is to say that the two edges of the cutting edge unite with the perpendicular to the coating 22 Have angles β and Γ of 10 - 80 °, preferably 60 °. The distance H between the cutting edge 24 and the surface of the foundry plates is 0.3-2.5 mm, preferably 0.8 mm. This minimizes the effect of surface tension reduced, and lateral displacements of the casting solution are largely avoided.

Es ist selbstverständlich, dass die erfindungsgemässe Vorrichtung bezüglich der angegebenen Masse variiert werden kann und den verschiedensten Beschichtungsbedingungen und Giesslösungskombinationen angepasst werden kann. Während jede einzelne Massnahme bereits weitgehende Verbesserungen bezüglich der Qualität der Beschichtung führt, ergibt eine Kombination sämtlicher Verbesserungen, wie beispielsweise Absaugen der abgeschnittenen Ränder, Absaugen der beim Messer gestauten Giesslösung sowie Vermeidung der durch die Oberflächenspannung bedingten Schichtdickenunterschiede sowie die Führung eines dünnen Flüssigkeitsfilms entlang der Seitenbegrenzungsplatten eine besonders stabile Beschichtung, deren Ränder keine Materialverluste oder Trocknungsprobleme mehr verursachen.It goes without saying that the device according to the invention can be varied with respect to the stated mass and can be adapted to the most varied of coating conditions and casting solution combinations. While every single measure already leads to extensive improvements in terms of the quality of the coating, a combination of all improvements results, such as vacuuming off the cut edges, vacuuming off the casting solution jammed with the knife and avoiding the layer thickness differences caused by the surface tension, and guiding a thin liquid film along the side boundary plates a particularly stable coating, the edges of which no longer cause material loss or drying problems.

Claims (14)

Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial, insbesondere photographische Emulsionen, wobei dem geführten Vorhang (6) beidseitig ein Seitenfluss (10) zugeführt wird und die Breite des Vorhangs grösser ist als die Breite der Beschichtung auf dem Träger, dadurch gekennzeichnet, dass der Seitenfluss (10) quer zur Erstreckung des Vorhanges (6), parallel zur Vorderwand (7') der Seitenführungen (7) eingespeist wird.Method for coating a moving support with a liquid coating material, in particular photographic emulsions, wherein the guided curtain (6) is fed with a side flow (10) on both sides and the width of the curtain is greater than the width of the coating on the support, characterized in that the side flow (10) is fed in transversely to the extent of the curtain (6), parallel to the front wall (7 ') of the side guides (7). Verfahren nach Anspruch 1, wobei beide Seiten des Vorhangs mittels Messer abgeschnitten werden, dadurch gekennzeichnet, dass die abgeschnittenen Seitenteile des Vorhangs (6) und des Seitenflusses (10) über einen Absaugschlitz (18) und Absaugkanal (19) abgesaugt werden.Method according to claim 1, wherein both sides of the curtain are cut off by means of a knife, characterized in that the cut side parts of the curtain (6) and the side flow (10) are sucked off via a suction slot (18) and suction channel (19). Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial, insbesondere photographische Emulsionen, wobei dem geführten Vorhang (6) beidseitig ein Seitenfluss (10) zugeführt wird und die Breite des Vorhangs grösser ist als die Breite der Beschichtung auf dem Träger und beide Seiten des Vorhangs mittels Messer abgeschnitten werden, deren Vorderkante (17) nach Innen geneigt ist, dadurch gekennzeichnet, dass zwecks Vermeidung eines Randwulstes von der Vorderkante des Messers gestaute Teile der Giesslösung durch Oeffnungen im Messer abgesaugt werden.Process for curtain coating a moving support with a liquid coating material, in particular photographic emulsions, wherein the guided curtain (6) is supplied with a side flow (10) on both sides and the width of the curtain is greater than the width of the coating on the support and both sides of the curtain can be cut off by means of a knife, the front edge (17) of which is inclined inwards, characterized in that parts of the casting solution which have been stowed from the front edge of the knife are sucked off through openings in the knife in order to avoid an edge bead. Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit einem flüssigen Beschichtungsmaterial, insbesondere photographische Emulsionen, dadurch gekennzeichnet, dass die Giesslösung oberhalb der Giesserlippe (4) durch Seitenbegrenzungsplatten (2) derart geführt ist, dass deren beiden Ränder nicht unter der Einwirkung der Oberflächenspannung an den Seiten der Seitenbegrenzungsplatten (2) steigen.Process for curtain coating of a moving support with a liquid coating material, in particular photographic emulsions, characterized in that the casting solution above the casting lip (4) is guided through side delimitation plates (2) in such a way that the two edges thereof are not under the action of the surface tension rise on the sides of the side boundary plates (2). Verfahren nach den Ansprüchen 1 bis 4.Process according to claims 1 to 4. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit zwei Seitenführungen (7) für den Vorhang (6), dadurch gekennzeichnet, dass oberhalb der Seitenführungen (7) je ein Dosierschlitz (11) angeordnet ist, dessen Schlitzende (12) ausgebildet ist, den Seitenfluss (10) parallel zur Vorderwand (7') der Seitenführung einzuspeisen.Device for carrying out the method according to claim 1 with two side guides (7) for the curtain (6), characterized in that a metering slot (11) is arranged above the side guides (7), the slot end (12) of which is formed, the side flow (10) feed parallel to the front wall (7 ') of the side guide. Vorrichtung nach Anspruch 6 mit je einem am unteren Ende der Seitenführung (7) angebrachten Messer (15), dessen Vorderkante (16) bezüglich der Innenseite der Seitenführung einen spitzen Winkel (α) einschliesst,dadurch gekennzeichnet, dass an der Oberseite (17) jeden Messers (12) in der Seitenführung (7) ein Absaugschlitz (18) angeordnet ist, der mit einem Absaugkanal (19) verbunden ist, um die abgeschnittenen Seitenteile des Vorhangs (6) und des Seitenflusses (10) abzusaugen.Apparatus according to claim 6, each with a knife (15) attached to the lower end of the side guide (7), the front edge (16) of which forms an acute angle (α) with respect to the inside of the side guide, characterized in that each on the top (17) Knife (12) in the side guide (7), a suction slot (18) is arranged, which is connected to a suction channel (19) to suction the cut off side parts of the curtain (6) and the side flow (10). Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, dass die Höhe des Absaugschlitzes (18) 0,05-0,5 mm beträgt.Apparatus according to claim 7, characterized in that the height of the suction slot (18) is 0.05-0.5 mm. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 2 mit zwei Seitenführungen (7) für den Vorhang (6) und je einem am unteren Ende der Seitenführung (7) angebrachten Messer (15), dessen Vorderkante (16) bezüglich der Innenseite der Seitenführung einen spitzen Winkel (α) einschliesst, dadurch gekennzeichnet, dass an der unteren Kante des Messers (15) ein Absaugschlitz (20) angeordnet ist, der mit einem Absaugkanal (21) verbunden ist.Apparatus for carrying out the method according to claim 2 with two side guides (7) for the curtain (6) and one knife (15) attached to the lower end of the side guide (7), the front edge (16) of which is at an acute angle with respect to the inside of the side guide (α), characterized in that a suction slot (20) is arranged on the lower edge of the knife (15) and is connected to a suction channel (21). Vorrichtung zur Durchführung des Verfahrens nach Anspruch 4 mit Giesserplatten (1) und einer bogenförmigen Giesserfrontplatte, die in die Giesserlippe (4) mündet und beidseitig angebrachten Seitenbegrenzungsplatten (2), dadurch gekennzeichnet, dass die begrenzende Kante (25) der Seitenbegrenzungsplatten (2) eine Schneide (24) aufweist, dessen beiden Schenkel einen Winkel von 10 - 80°, vorzugsweise 60°, einschliessen.Apparatus for carrying out the method according to claim 4 with foundry plates (1) and an arcuate foundry front plate which opens into the pouring lip (4) and side delimitation plates (2) attached on both sides, characterized in that the delimiting edge (25) of the side delimitation plates (2) is one Has cutting edge (24), the two legs of which form an angle of 10-80 °, preferably 60 °. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Seitenbegrenzungsplatten (2) dicht auf die Giesserplatten (1) montiert werden und die Giesser-Frontplatte (5) bis zur Giesserlippe (4) überdecken.Apparatus according to claim 10, characterized in that the side boundary plates (2) are mounted tightly on the foundry plates (1) and cover the foundry front plate (5) up to the foundry lip (4). Vorrichtung nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass der Abstand (H) zwischen der Schneide (24) und der Oberfläche der Giesserplatten (1) 0,3 - 2,5 mm, vorzugsweise 0,8 mm beträgt.Apparatus according to claim 10 or 11, characterized in that the distance (H) between the cutting edge (24) and the surface of the foundry plates (1) is 0.3-2.5 mm, preferably 0.8 mm. Vorrichtung nach einem der Ansprüche 6 bis 12, dadurch gekennzeichnet, dass der Absaugschlitz (18) an der Oberseite (17) jeden Messers (12) und/oder der Absaugschlitz (20) an der unteren Kante (21) des Messers mit einer Wasserspülung versehen ist.Device according to one of claims 6 to 12, characterized in that the suction slot (18) on the top (17) of each knife (12) and / or the suction slot (20) on the lower edge (21) of the knife provide a water rinse is. Vorrichtung nach den Ansprüchen 6, 7, 8, 10 und 13.Device according to claims 6, 7, 8, 10 and 13.
EP19950810277 1995-04-26 1995-04-26 Process and apparatus for curtain-coating a moving substrate Expired - Lifetime EP0740197B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP19950810277 EP0740197B1 (en) 1995-04-26 1995-04-26 Process and apparatus for curtain-coating a moving substrate
EP98100164A EP0841588B1 (en) 1995-04-26 1995-04-26 Process and apparatus for curtain-coating a moving substrate
EP98100165A EP0841589B1 (en) 1995-04-26 1995-04-26 Process and apparatus for curtain-coating of a moving substrate
DE59506354T DE59506354D1 (en) 1995-04-26 1995-04-26 Method and device for curtain coating of a moving support

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EP19950810277 EP0740197B1 (en) 1995-04-26 1995-04-26 Process and apparatus for curtain-coating a moving substrate

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EP98100164A Division EP0841588B1 (en) 1995-04-26 1995-04-26 Process and apparatus for curtain-coating a moving substrate
EP98100165A Division EP0841589B1 (en) 1995-04-26 1995-04-26 Process and apparatus for curtain-coating of a moving substrate

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EP0907103A1 (en) * 1997-10-03 1999-04-07 Troller Schweizer Engineering AG Process and apparatus for curtain coating a moving substrate
EP0858842A3 (en) * 1997-02-05 1999-07-14 Eastman Kodak Company Edge Removal apparatus including airflow blocking means for curtain coating
EP0858843A3 (en) * 1997-02-05 1999-07-14 Eastman Kodak Company Edge removal apparatus for curtain coating
EP1239078A1 (en) * 2001-03-06 2002-09-11 Voith Paper Patent GmbH Curtain coater
WO2003049871A1 (en) 2001-12-13 2003-06-19 Dow Global Technologies Inc. Method and apparatus for curtain coating
WO2003049870A1 (en) * 2001-12-13 2003-06-19 Dow Global Technologies Inc. Method and apparatus for curtain coating
EP1398084A1 (en) 2002-09-10 2004-03-17 ILFORD Imaging Switzerland GmbH Curtain coating method and device for coating a moving substrate
US6887312B1 (en) 2001-03-06 2005-05-03 Voith Paper Patent Gmbh Applicator
DE102006060954A1 (en) * 2006-12-20 2008-06-26 Inatec Gmbh A lamination method and apparatus for applying a film of an adhesive composition to a sheet substrate
DE102010042291A1 (en) * 2010-10-11 2012-04-12 Fmp Technology Gmbh Fluid Measurements & Projects Device for curtain coating of carrier, has liquid layer and slot nozzle tool for producing curtain formed from liquid layer
DE102014013996A1 (en) 2014-09-25 2016-03-31 Andritz Küsters Gmbh Method and apparatus for curtain coating

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DE10117668A1 (en) * 2001-04-09 2002-10-10 Bachofen & Meier Ag Buelach Device for coating a running material web
FI117176B (en) * 2005-01-27 2006-07-14 Metso Paper Inc A device for adjusting the application width of a level feed curtain wrapper
FI121189B (en) * 2007-10-17 2010-08-13 Metso Paper Inc Edge Guide and Method for Extending the Life of Curtain Edge Edge Guide
JP2009101321A (en) * 2007-10-25 2009-05-14 Voith Patent Gmbh Coating width adjustment device
JP5228227B2 (en) * 2007-12-05 2013-07-03 ボイス パテント ゲーエムベーハー Curtain coater edge guide
JP2009136751A (en) * 2007-12-05 2009-06-25 Voith Patent Gmbh Curtain coater
FI120885B (en) * 2008-11-20 2010-04-15 Metso Paper Inc Kantstyrare
JP5605098B2 (en) * 2009-09-08 2014-10-15 株式会社リコー Curtain coating apparatus and curtain coating method
DE102012004875B3 (en) * 2012-03-10 2012-07-19 Andritz Küsters Gmbh Device for curtain coating current material web e.g. paper web, has guide comprising suction apparatus with suction channel, and nozzle provided at channel, where steam at rear side of suction slot is injected into channel via nozzle
CN104549797B (en) * 2013-10-28 2017-01-18 沈阳芯源微电子设备有限公司 Liquid spraying device with cleaning component

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EP0858842A3 (en) * 1997-02-05 1999-07-14 Eastman Kodak Company Edge Removal apparatus including airflow blocking means for curtain coating
EP0858843A3 (en) * 1997-02-05 1999-07-14 Eastman Kodak Company Edge removal apparatus for curtain coating
EP0907103A1 (en) * 1997-10-03 1999-04-07 Troller Schweizer Engineering AG Process and apparatus for curtain coating a moving substrate
US6048582A (en) * 1997-10-03 2000-04-11 Troller Schweizer Engineering Ag Method and apparatus for curtain coating providing a lateral liquid film velocity equal to the curtain falling velocity
EP1239078A1 (en) * 2001-03-06 2002-09-11 Voith Paper Patent GmbH Curtain coater
US6887312B1 (en) 2001-03-06 2005-05-03 Voith Paper Patent Gmbh Applicator
WO2003049870A1 (en) * 2001-12-13 2003-06-19 Dow Global Technologies Inc. Method and apparatus for curtain coating
WO2003049871A1 (en) 2001-12-13 2003-06-19 Dow Global Technologies Inc. Method and apparatus for curtain coating
EP1398084A1 (en) 2002-09-10 2004-03-17 ILFORD Imaging Switzerland GmbH Curtain coating method and device for coating a moving substrate
US7160579B2 (en) 2002-09-10 2007-01-09 Ilford Imaging Switzerland Gmbh Method and device for coating a moving web
DE102006060954A1 (en) * 2006-12-20 2008-06-26 Inatec Gmbh A lamination method and apparatus for applying a film of an adhesive composition to a sheet substrate
DE102010042291A1 (en) * 2010-10-11 2012-04-12 Fmp Technology Gmbh Fluid Measurements & Projects Device for curtain coating of carrier, has liquid layer and slot nozzle tool for producing curtain formed from liquid layer
DE102014013996A1 (en) 2014-09-25 2016-03-31 Andritz Küsters Gmbh Method and apparatus for curtain coating
EP3006115A1 (en) 2014-09-25 2016-04-13 Andritz Küsters GmbH Method and device for curtain coating

Also Published As

Publication number Publication date
EP0740197B1 (en) 1999-07-07
DE59506354D1 (en) 1999-08-12
EP0841588A2 (en) 1998-05-13
EP0841589A2 (en) 1998-05-13
EP0841589A3 (en) 1998-07-08
EP0841589B1 (en) 2001-08-08
EP0841588A3 (en) 1998-07-08
EP0841588B1 (en) 2002-07-10

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