EP0115621A2 - Procédé et appareil pour la stabilisation de rideaux liquides en chute libre - Google Patents

Procédé et appareil pour la stabilisation de rideaux liquides en chute libre Download PDF

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Publication number
EP0115621A2
EP0115621A2 EP83113019A EP83113019A EP0115621A2 EP 0115621 A2 EP0115621 A2 EP 0115621A2 EP 83113019 A EP83113019 A EP 83113019A EP 83113019 A EP83113019 A EP 83113019A EP 0115621 A2 EP0115621 A2 EP 0115621A2
Authority
EP
European Patent Office
Prior art keywords
curtain
liquid
coating
holders
edge
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
EP83113019A
Other languages
German (de)
English (en)
Other versions
EP0115621A3 (en
EP0115621B1 (fr
Inventor
Günther Dr. Koepke
Hans Dipl.-Ing. Frenken
Heinrich Dipl.-Ing. Bussmann
Kurt Browatzki
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 EP0115621A2 publication Critical patent/EP0115621A2/fr
Publication of EP0115621A3 publication Critical patent/EP0115621A3/de
Application granted granted Critical
Publication of EP0115621B1 publication Critical patent/EP0115621B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/06—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work
    • 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
    • G03C2001/7433—Curtain coating
    • 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
    • G03C2001/7455—Edge bead nonuniformity coated at the border
    • 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
    • G03C2001/747—Lateral edge guiding means for curtain coating
    • 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

  • curtain coating processes are increasingly being used as precision coating processes in the furniture industry for painting boards, for coating other objects and in the photographic industry for applying several photographic layers at the same time to moving material webs.
  • Curtain coating processes and suitable casting devices are known, for example, from US Pat. Nos. 3,508,947, 3,632,374 and 3,867,901.
  • the coating material falling next to the web edges is collected in collecting trays for recycling.
  • This procedure one or more layered castings can be created at high speed.
  • this procedure has serious disadvantages. Since the curtain is usually 1 - 6 cm wider on each side than the web to be coated, the entire coating device must be made wider and the dosing systems larger. Since multilayer coatings are predominantly carried out in the photographic industry, the mixed layers falling past the edges can no longer be used and thus losses. With a web width of 100 cm there is an intolerable loss of on average up to 10% of the valuable coating material.
  • the method shows very good results if low-viscosity liquids are used to generate the liquid bridges between the curtain and the side curtain holders, the viscosities of which are between 1 mPas and 20 mPas, preferably between 1 mPas and 10 mPas.
  • the curtain coating device with a stabilizing device for the free-falling curtain for single or multiple coating of layer carriers continuously guided past a coating point, such as sheets or objects, is characterized according to the invention in that between the coating edge of the coating device and the sheet for lateral guidance of the Hollow curtain holders are arranged on both sides inside, which are provided with a separate liquid supply in their entire height with a distribution channel and a delivery device for the auxiliary liquid in the direction of the curtain to form liquid bridges between the curtain and curtain holders.
  • closed tubular hollow bodies made of a porous, liquid-permeable material are used as curtain holders for the device, which are provided with a liquid supply device and are coated on the entire surface with a liquid layer to form the liquid bridges.
  • the device is characterized by the considerable improvement in the coating conditions, by its simple and inexpensive production possibility and by the possibility of attaching the curtain holders to existing coating devices, the curtain holders being arranged close to the coating edge of a coating device, so that the liquid bridges start directly at the coating edge and wherein the curtain holders are arranged in the plane of the vertically free-falling liquid curtain to the curtain by an angle ⁇ and away from the curtain by an angle + ⁇ , the angle ⁇ from -10 ° to + 10 °, preferably from -5 ° is adjustable up to 0 °.
  • the device can also be adapted to all coating problems within wide limits, with the amount of liquid metered into the curtain holder being adjustable at the point of impact of the curtain on the support for the choice of the width of the liquid bridges, so that depending on the metered amount of liquid smaller or larger triangular areas on both sides of the curtain Form liquid bridges.
  • a curtain caster of the same area or beak caster type is shown.
  • the coating liquids are metered in laterally to the caster (not shown), rise to outlet slots 1 (see FIG. 2) and lie on the sliding surfaces 2 as a layer. Due to gravity, the individual layers flow down the sliding surfaces 2, lie on top of one another and flow to the beak-shaped loading. layering edge 3, on which a free-falling curtain 4 forms, which strikes the continuously moving (arrows) web 5 via the drop height h and lies on the web 5 as a layer package.
  • the web 5 is guided and diverted on a coating roller 7 at the point of impact of the curtain 4.
  • the width of the coating roller 7 is smaller than the width of the diverted web 5 so that the web edges are exposed.
  • the coating roller 7 is mounted on a wider shaft 8 and is driven by this.
  • an auxiliary liquid 11 is fed to the curtain holders 9 through a feed line 10.
  • the liquid 11 supplied to the curtain holders 9 is distributed in a distribution channel 12 (FIG. 3) over the entire height of the curtain holder from the coating edge 3 to the point of impact of the liquid curtain 4 on the web 5 and enters from a slot 13 (FIG.
  • the web 5 can be coated with the coating liquid and the curtain 4 either over its entire width, or exactly up to the edges of the web 5 or finally up to a few millimeters in front of the edges.
  • 1 shows a coating up to shortly before the edges of the web, which results in very good wetting of the edge regions of the web 5, the edge beads of the coating are considerably reduced and high-quality coating liquids are saved.
  • 1 and 3 a narrow edge strip of the web is wetted and coated with the auxiliary liquid 11. The remaining auxiliary liquid 11 falling through between the web edges and the curtain holders 9 is thus free of high-quality coating liquids and is collected by collecting trays 15 and sent for reuse (see arrow).
  • FIG. 2 shows the function of a bill curtain coating device already mentioned above.
  • the layers detaching at the coating edge 3 fall as a free-falling liquid curtain 4 over the drop height h onto the layer support 5, for example a photographic film or paper web, which is continuously moved underneath and lay down as a layer package 6.
  • the liquid of the curtain 4 accelerates, so that the curtain 4 towards the web 5 becomes increasingly thinner.
  • Contraction forces arise in the curtain, which aim to reduce the width of the curtain.
  • This contraction can be counteracted to a small extent by curtain holders 9, but there is a risk that the curtain 4 will detach itself from the curtain holders at the slightest occasion, that is, tear it off.
  • the liquid bridges 14 are produced by the curtain holders 9, into which an auxiliary liquid 11 is metered in laterally through a nozzle 10.
  • the auxiliary liquid 11 is distributed over the entire height in distribution pipes 12 in the curtain holders 9 and passes through a narrow slot or gap 13 in the plane of the and in the direction of the curtain 4 and already connects to the liquid of the curtain 4 at the coating edge 3.
  • the emerging auxiliary liquid 11 adapts to the contraction of the curtain 4, so that a triangular liquid surface is created as the liquid bridge 14.
  • the excess auxiliary liquid 11 falling between the curtain holders 9 and the edges of the web 5 is collected in collecting trays 15 and reused.
  • Aqueous solutions with the addition of wetting agents can be used as auxiliary liquids in the curtain holders the.
  • Gelatin solutions of appropriate concentration with or without added wetting agent are also suitable.
  • Other polymers, such as cellulose esters (Kelco), polyacrylamide, etc., are also suitable as agents for viscosity adjustment. If coatings are carried out with solvent-containing layers, for example with magnetic lacquers, the curtain holders are fed with appropriate solvent combinations.
  • Fig. 4 shows a particularly simple curtain holder 9.
  • a tube 16 closed at the top and bottom was provided with a narrow slot 13, the inner bore being used as a distribution channel 12.
  • the distribution channel 12 is provided with a supply nozzle 10 through which the auxiliary liquid 11 is supplied.
  • the slot 13 is arranged in the direction of the curtain 4 and has a width of 0.2 to 0.8 mm, preferably 0.3 to 0.4 mm.
  • the auxiliary liquid 11 emerging from the slot 13 forms a liquid bridge 14 to the curtain 4.
  • Fig. 5 shows the section through a special embodiment of a curtain holder 9 with a flat elongated cross section and a large distribution channel 12 and a long slot 13 for the directed discharge of the auxiliary liquid 11 to form a stable liquid bridge 14 to the curtain 4.
  • the auxiliary liquid 11 is through a Stub 10 fed to the distribution channel 12.
  • a tube made of porous liquid-permeable material 20 which is closed at the top and bottom is used as the curtain holder 9.
  • the auxiliary liquid 11 is supplied through a nozzle 10 to the bore 12, which serves as a distribution channel.
  • a gap is not necessary in this embodiment, since the liquid 11 is driven through the pores under pressure of the metering device and forms a closed liquid film around the tube, which is correspondingly thicker in the direction of fall of the curtain 4 and is drawn off from the curtain 4 as a liquid bridge 14 becomes.
  • the film formed around the tube 20 also prevents incrustation and hardening of particularly volatile substances and rinses deposits such as dust or fluff away from the atmosphere.
  • FIG. 7 shows a curtain holder 9 according to FIG. 4, the gap 13 of which is designed to be much wider in order to avoid incrustations and into which a porous liquid-permeable material 21 is incorporated.
  • curtain holders 9 Other types of designs for the curtain holders 9 are possible, for example with a triangular cross section or other cross sections, but have not been shown since they are in principle similar to the ones shown.
  • the method and apparatus have been described for a beak curtain coater, but they are by no means limited to this variant of the curtain coater.
  • the described Curtain holders can be used in the same way for all curtain coating devices, for example also for a curtain coating device in which the coating liquid is fed to a coating edge from both sides, according to European patent 0 017 126, for slot casters, extrusion casters or also for overflow casters, in which Coating liquid runs from a container over a weir and is placed by the weir as a free-falling curtain on a material to be coated.
  • curtain holders described are also suitable for non-photographic coatings, for example for coatings with magnetic lacquers, paints, glues, polymer solutions or similar coating liquids.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a single-layer coating.
  • a PE-coated, 230 ⁇ m thick paper web was used as a layer support.
  • the coating width was 11 cm.
  • the casting quality was good and there was a very small bead thickness at the edge of the web.
  • the curtain was very stable. There was no loss of high quality coating material.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a triacetate film with a thickness of 128 ⁇ m was coated.
  • the coating width was 11 cm.
  • the casting quality was good and there was a very small bead thickness at the edge of the web.
  • the curtain was very stable.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper with an adhesive layer of 230 ⁇ m thickness was coated.
  • the casting quality and the curtain stability were very good and the edge bead thickness was very small.
  • the layer width generated by the curtain itself on the web corresponded exactly to the width of the layers running off at the coating edge.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with two layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • the coating width was 13.9 cm.
  • the casting quality and the curtain stability were very good.
  • the layer width on the track corresponded to the width of the layer package on the foundry sliding surface.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 3 layers.
  • a PE-coated paper 230 ⁇ m thick was coated.
  • the coating width was 13.9 cm.
  • a coating device according to FIG. 1 was provided with curtain holders according to FIG. 5 and used for a coating with 5 layers.
  • a PE-coated paper with an adhesive layer of 230 ⁇ m thickness was coated.
  • the coating width was 13.9 cm.
  • the dosage in the curtain holder was increased to 1.6 l / m min.
  • the curtain was very stable and the edge bead was low.
  • the casting quality was good and the width of the layer package placed on the web corresponded exactly to the width of the layers running off at the coating edge.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP83113019A 1983-01-04 1983-12-23 Procédé et appareil pour la stabilisation de rideaux liquides en chute libre Expired EP0115621B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3300150 1983-01-04
DE19833300150 DE3300150A1 (de) 1983-01-04 1983-01-04 Verfahren und vorrichtung zur stabilisierung von frei fallenden fluessigkeitsvorhaengen

Publications (3)

Publication Number Publication Date
EP0115621A2 true EP0115621A2 (fr) 1984-08-15
EP0115621A3 EP0115621A3 (en) 1985-10-23
EP0115621B1 EP0115621B1 (fr) 1987-02-04

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EP83113019A Expired EP0115621B1 (fr) 1983-01-04 1983-12-23 Procédé et appareil pour la stabilisation de rideaux liquides en chute libre

Country Status (4)

Country Link
US (1) US4479987A (fr)
EP (1) EP0115621B1 (fr)
JP (1) JPS59132966A (fr)
DE (2) DE3300150A1 (fr)

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FR2580199A1 (fr) * 1985-04-15 1986-10-17 Siderurgie Fse Inst Rech Procede et dispositif de reglage de la largeur d'un rideau de liquide
EP0327020A2 (fr) * 1988-02-01 1989-08-09 Fuji Photo Film Co., Ltd. Appareil de revêtement
WO1989010583A1 (fr) * 1988-04-22 1989-11-02 Eastman Kodak Company Procede et appareil de revetement par rideau
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EP0567071A1 (fr) * 1992-04-21 1993-10-27 Fuji Photo Film Co., Ltd. Procédé de revêtement au rideau
EP0603087A2 (fr) * 1992-12-18 1994-06-22 Eastman Kodak Company Méthode d'enduction au rideau et appareil
EP0606038A1 (fr) * 1993-01-07 1994-07-13 Eastman Kodak Company Dispositif d'enduction au rideau avec évacuation du bord
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EP0649054A1 (fr) * 1993-10-18 1995-04-19 Eastman Kodak Company Appareil et méthode pour réaliser une bordure de guidage interne en forme de bande
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0176632A1 (fr) * 1984-10-05 1986-04-09 Agfa-Gevaert N.V. Méthode et appareil pour l'enduction sous forme de rideau
FR2580199A1 (fr) * 1985-04-15 1986-10-17 Siderurgie Fse Inst Rech Procede et dispositif de reglage de la largeur d'un rideau de liquide
EP0327020A2 (fr) * 1988-02-01 1989-08-09 Fuji Photo Film Co., Ltd. Appareil de revêtement
EP0327020A3 (en) * 1988-02-01 1989-10-18 Fuji Photo Film Co., Ltd. Coating apparatus
WO1989010583A1 (fr) * 1988-04-22 1989-11-02 Eastman Kodak Company Procede et appareil de revetement par rideau
WO1990001179A1 (fr) * 1988-07-20 1990-02-08 Eastman Kodak Company Procede et appareil de couchage par projection
WO1990000939A1 (fr) * 1988-07-20 1990-02-08 Eastman Kodak Company Procede et appareil pour moduler les parties marginales d'un voile de couchage
US5304402A (en) * 1991-06-03 1994-04-19 Fuji Photo Film Co., Ltd. Curtain coating method with reduced neck-in
EP0517170A1 (fr) * 1991-06-03 1992-12-09 Fuji Photo Film Co., Ltd. Méthode d'enduction
US5339255A (en) * 1992-02-14 1994-08-16 Fuji Photo Film Co., Ltd. Method of controlling synthesis reaction
EP0567071A1 (fr) * 1992-04-21 1993-10-27 Fuji Photo Film Co., Ltd. Procédé de revêtement au rideau
EP0603087A2 (fr) * 1992-12-18 1994-06-22 Eastman Kodak Company Méthode d'enduction au rideau et appareil
EP0603087A3 (fr) * 1992-12-18 1994-11-17 Eastman Kodak Co Méthode d'enduction au rideau et appareil.
EP0606038A1 (fr) * 1993-01-07 1994-07-13 Eastman Kodak Company Dispositif d'enduction au rideau avec évacuation du bord
EP0649054A1 (fr) * 1993-10-18 1995-04-19 Eastman Kodak Company Appareil et méthode pour réaliser une bordure de guidage interne en forme de bande
US5906865A (en) * 1995-04-10 1999-05-25 Agfa-Gevaert, N.V. Process and apparatus for reducing turbulence during curtain-coating
WO1999009253A2 (fr) * 1997-08-15 1999-02-25 Jagenberg Papiertechnik Gmbh Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton
WO1999009253A3 (fr) * 1997-08-15 1999-05-14 Jagenberg Papiertech Gmbh Procede et dispositif permettant d'appliquer un enduit pigmente sur une bande de papier ou de carton

Also Published As

Publication number Publication date
DE3300150A1 (de) 1984-07-05
JPS59132966A (ja) 1984-07-31
DE3369743D1 (en) 1987-03-12
EP0115621A3 (en) 1985-10-23
US4479987A (en) 1984-10-30
EP0115621B1 (fr) 1987-02-04

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