EP0906789A1 - Procédé et appareil pour le revêtement par rideau d'un support en movement - Google Patents

Procédé et appareil pour le revêtement par rideau d'un support en movement Download PDF

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Publication number
EP0906789A1
EP0906789A1 EP97810732A EP97810732A EP0906789A1 EP 0906789 A1 EP0906789 A1 EP 0906789A1 EP 97810732 A EP97810732 A EP 97810732A EP 97810732 A EP97810732 A EP 97810732A EP 0906789 A1 EP0906789 A1 EP 0906789A1
Authority
EP
European Patent Office
Prior art keywords
air
carrier
gap
curtain
cavity
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
EP97810732A
Other languages
German (de)
English (en)
Other versions
EP0906789B1 (fr
Inventor
Peter M. Schweizer
Urs Troller
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.)
Vestincoat AG
Original Assignee
Troller Schweizer Engineering 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 Troller Schweizer Engineering AG filed Critical Troller Schweizer Engineering AG
Priority to EP97810732A priority Critical patent/EP0906789B1/fr
Priority to DE59704675T priority patent/DE59704675D1/de
Priority to US09/165,688 priority patent/US6162502A/en
Priority to JP10282504A priority patent/JPH11188298A/ja
Publication of EP0906789A1 publication Critical patent/EP0906789A1/fr
Application granted granted Critical
Publication of EP0906789B1 publication Critical patent/EP0906789B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • 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
    • B05C5/005—Curtain coaters
    • 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

Definitions

  • the present invention relates to a method and a device according to the preamble of claim 1 or 3. It can be any coating material act.
  • the pour point denotes the place where the liquid to be poured for the first time with the carrier in Touch comes. With many coating processes, too when casting curtains, this place is designed as a line and is called the dynamic wetting line. The area near the carrier, in which the air is moving due to friction is called the boundary layer.
  • Watering means that the air on the carrier is To replace liquid. If that doesn't work out what to do can be the case especially at higher casting speeds, there is air between the carrier and the liquid film pulled, and then a coherent coating is no longer possible.
  • EP-B-0 489 978 is also a concentric around the Casting roller arranged shield used to To mechanically block the boundary layer. In addition, the Air flowing through the concentric gap in the Sucked off middle of the body.
  • the suction device is particularly not due to their slot-like design designed efficiently.
  • EP-B-0 489 978 there is also one relatively large chamber between the suction slot and concentric gap arranged. In this chamber the Air swirled strongly, so that the residual air with in the direction transverse to the carrier movement of non-uniform force on the Curtain hits, and therefore quality loss can cause.
  • the one placed in the middle of the body Extraction device also causes air from the room between body and curtain in the concentric gap is sucked against the carrier movement. This pull creates in front of the curtain and especially near the dynamic Wetting line an additional air flow that is transverse to the Carrier movement is non-uniform, and therefore one Quality loss on the coated film can cause.
  • the following description refers to a Consideration in the direction of the carrier movement, which is shown in FIG is indicated by an arrow U.
  • the inventive The device contains a body 1 which is in front of the curtain 2 is arranged concentrically around the casting roll 3, and thereby a uniform gap 4 between the carrier surface 5 and the body 1 from 0.1 to 1.0 mm, preferably 0.3 to 0.6 mm Height H forms.
  • suction channel Suction device There is a known one on the suction channel Suction device connected.
  • a first layer 8 of porous material is arranged in a first cavity 6, through which the air is drawn off.
  • the cavity remaining behind the porous layer helps to ensure that the air is sucked off efficiently and uniformly over the entire length L 2 and width of the porous layer.
  • the length L 2 is, for example, 15 mm.
  • a second cavity 9 which likewise has a layer 10 of porous material on the carrier side and is connected to an air supply duct 11, air not being drawn off through this second porous layer, but being fed in uniformly.
  • the air feed which is uniform across the carrier movement and has a length L 4 of, for example, 10 mm, is also brought about by the cavity located behind the porous layer.
  • the air supply duct is connected to an air supply device, not shown, so that the pressure and thus the volume flow of the air fed in can be set precisely.
  • the lengths L 1 and L 3 of the body before and after the first porous layer 8 are dimensioned such that a fully developed flow occurs in the concentric gap 4.
  • the minimum lengths for L 1 and L 3 depend primarily on the carrier speed and the gap width and are approximately 3 to 15 mm at a speed of 5 m / s and a gap height of 0.5 mm.
  • the layer thickness of the porous layers depends, among other things on the porosity and specific surface area of the porous medium.
  • the layer thickness must be dimensioned in this way be that the pressure drop in the air flow through the porous Layer essential, i.e. for example by a factor of 100, is greater than the pressure drop across the air flow Carrier movement in the channel behind the porous layer.
  • a porosity of 0.4 and a beam width of 1 m this results in a layer thickness of approx. 8 mm.
  • the distance d normalized with the gap height H is in FIG 3 as a function of the pressure difference ⁇ p and one receives the location of the zero speed.
  • the two volume flows are in Figure 4 as a function of Pressure difference ⁇ p shown.
  • the amount of air hitting the curtain and the amount of air that needs to be drawn off can be regulated as desired by setting the negative pressure p 0 .
  • it can be set as small as desired, thus minimizing the quality-reducing influences on the curtain. It is important that the amount of air that has to be extracted is not excessively extracted from the space between the curtain and body and thus causes disturbing air flows in front of the curtain, but that the amount of air is fed in in the correct amount through the porous layer at the outlet of the gap , in such a way that there are no disturbing air currents, both in front of the curtain and in the gap. Only the amount of air Q 1 flowing through the gap in the direction of the moving support and striking the curtain may be drawn out of the space between the curtain and the body.

Landscapes

  • 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)
  • Curtains And Furnishings For Windows Or Doors (AREA)
EP97810732A 1997-10-03 1997-10-03 Procédé et appareil pour le revêtement par rideau d'un support en movement Expired - Lifetime EP0906789B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP97810732A EP0906789B1 (fr) 1997-10-03 1997-10-03 Procédé et appareil pour le revêtement par rideau d'un support en movement
DE59704675T DE59704675D1 (de) 1997-10-03 1997-10-03 Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers
US09/165,688 US6162502A (en) 1997-10-03 1998-10-02 Method and device for curtain coating a moving support
JP10282504A JPH11188298A (ja) 1997-10-03 1998-10-05 移動支持体をカーテンコーティングする方法および装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP97810732A EP0906789B1 (fr) 1997-10-03 1997-10-03 Procédé et appareil pour le revêtement par rideau d'un support en movement

Publications (2)

Publication Number Publication Date
EP0906789A1 true EP0906789A1 (fr) 1999-04-07
EP0906789B1 EP0906789B1 (fr) 2001-09-19

Family

ID=8230414

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97810732A Expired - Lifetime EP0906789B1 (fr) 1997-10-03 1997-10-03 Procédé et appareil pour le revêtement par rideau d'un support en movement

Country Status (4)

Country Link
US (1) US6162502A (fr)
EP (1) EP0906789B1 (fr)
JP (1) JPH11188298A (fr)
DE (1) DE59704675D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091917A1 (fr) 2000-06-02 2001-12-06 Mitsubishi Hitec Paper Flensburg Gmbh Procede et dispositif de couchage par voile
WO2006056386A1 (fr) 2004-11-22 2006-06-01 Basf Aktiengesellschaft Dispositif et procede de couchage par voile de substrats mobiles
WO2006134052A1 (fr) 2005-06-15 2006-12-21 Basf Aktiengesellschaft Systeme de revetement en rideau, muni d'un dispositif de derochage de la couche limite
WO2008000507A1 (fr) * 2006-06-30 2008-01-03 Polytype Converting S.A. Dispositif d'enduction à rideau avec structure poreuse de guidage de rideau, structure de guidage de rideau pour un dispositif d'enduction à rideau et procédé de fabrication de la structure de guidage de rideau

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10117667A1 (de) * 2001-04-09 2002-10-10 Bachofen & Meier Ag Buelach Vorrichtung zum Absaugen einer Luftgrenzschicht von einer laufenden Materialbahn
CA2469292C (fr) * 2001-12-13 2011-06-07 Dow Global Technologies Inc. Procede et dispositif de couchage par voile
DE60209434T2 (de) 2002-12-12 2006-10-19 Metso Paper, Inc. Verfahren und Vorrichtung zum Vorhang- Beschichten
DE602005017805D1 (de) * 2004-09-09 2009-12-31 Avery Dennison Corp Vorhangbeschichtungsverfahren
ATE430217T1 (de) * 2006-09-01 2009-05-15 Mitsubishi Hitec Paper Bielfel Vorhangbeschichtungsverfahren sowie eine dafür verwendete vorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4842900A (en) * 1986-02-12 1989-06-27 Fuji Photo Film Co., Ltd. Method and apparatus for coating
EP0440279A1 (fr) * 1990-01-29 1991-08-07 Agfa-Gevaert N.V. Dispositif pour l'enduction sous forme de rideau d'éléments photographiques
EP0489978A1 (fr) * 1990-12-12 1992-06-17 Agfa-Gevaert N.V. Enduiseuse à rideau
EP0704752A1 (fr) * 1994-09-27 1996-04-03 Ilford Ag Méthode et dispositif d'enduire du rideau sur un support en mouvement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4842900A (en) * 1986-02-12 1989-06-27 Fuji Photo Film Co., Ltd. Method and apparatus for coating
EP0440279A1 (fr) * 1990-01-29 1991-08-07 Agfa-Gevaert N.V. Dispositif pour l'enduction sous forme de rideau d'éléments photographiques
EP0489978A1 (fr) * 1990-12-12 1992-06-17 Agfa-Gevaert N.V. Enduiseuse à rideau
EP0704752A1 (fr) * 1994-09-27 1996-04-03 Ilford Ag Méthode et dispositif d'enduire du rideau sur un support en mouvement

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091917A1 (fr) 2000-06-02 2001-12-06 Mitsubishi Hitec Paper Flensburg Gmbh Procede et dispositif de couchage par voile
WO2006056386A1 (fr) 2004-11-22 2006-06-01 Basf Aktiengesellschaft Dispositif et procede de couchage par voile de substrats mobiles
WO2006134052A1 (fr) 2005-06-15 2006-12-21 Basf Aktiengesellschaft Systeme de revetement en rideau, muni d'un dispositif de derochage de la couche limite
WO2008000507A1 (fr) * 2006-06-30 2008-01-03 Polytype Converting S.A. Dispositif d'enduction à rideau avec structure poreuse de guidage de rideau, structure de guidage de rideau pour un dispositif d'enduction à rideau et procédé de fabrication de la structure de guidage de rideau

Also Published As

Publication number Publication date
DE59704675D1 (de) 2001-10-25
EP0906789B1 (fr) 2001-09-19
JPH11188298A (ja) 1999-07-13
US6162502A (en) 2000-12-19

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