EP0906789B1 - 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
EP0906789B1
EP0906789B1 EP97810732A EP97810732A EP0906789B1 EP 0906789 B1 EP0906789 B1 EP 0906789B1 EP 97810732 A EP97810732 A EP 97810732A EP 97810732 A EP97810732 A EP 97810732A EP 0906789 B1 EP0906789 B1 EP 0906789B1
Authority
EP
European Patent Office
Prior art keywords
support
air
gap
cavity
curtain
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.)
Expired - Lifetime
Application number
EP97810732A
Other languages
German (de)
English (en)
Other versions
EP0906789A1 (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
TSE 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 TSE Troller Schweizer Engineering AG filed Critical TSE Troller Schweizer Engineering AG
Priority to DE59704675T priority Critical patent/DE59704675D1/de
Priority to EP97810732A priority patent/EP0906789B1/fr
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

Links

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. This can be any coating material.
  • the pour point denotes the place where the liquid to be poured comes into contact with the carrier for the first time.
  • this location is designed as a line and is referred to as a dynamic wetting line.
  • the area near the carrier in which the air moves due to friction is called the boundary layer.
  • Watering means replacing the air on the carrier with a liquid. If this does not succeed, which can be the case especially at higher casting speeds, air is drawn between the carrier and the liquid film, and a coherent coating is then no longer possible.
  • EP-B-0 489 978 also uses a shield arranged concentrically around the casting roll in order to mechanically block the boundary layer. In addition, the air flowing through the concentric gap is drawn off in the middle of the body.
  • the suction device in particular is not designed efficiently due to its slot-like design.
  • EP-B-0 489 978 there is also a relatively large chamber between the suction slot and the concentric gap. The air is strongly swirled in this chamber so that the residual air impinges on the curtain with a non-uniform force in the direction transverse to the carrier movement and can therefore cause losses in quality.
  • the suction device arranged in the middle of the body also causes air to be drawn from the space between the body and the curtain into the concentric gap against the carrier movement. This suction creates an additional air flow in front of the curtain and especially in the vicinity of the dynamic wetting line, which is non-uniform across the carrier movement and can therefore cause a loss of quality on the coated film.
  • the device according to the invention contains a body 1, which is arranged in front of the curtain 2 concentrically around the casting roll 3, and thereby forms a uniform gap 4 between the carrier surface 5 and the body 1 of 0.1-1.0 mm, preferably 0.3-0.6 mm, height H.
  • a first cavity 6 is arranged in the first half of the body and extends over the entire width of the carrier surface and opens into a suction channel 7.
  • a suction device known per se is connected to the suction channel.
  • a first layer 8 of porous material is arranged in the 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 made of porous material on the carrier side and to an air supply duct 11 is connected, whereby air is not drawn off through this second porous layer, but is 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 height and are approximately 3 to 15 mm at a speed of 5 m / s and a gap height of 0.5 mm.
  • the air fed in causes a regulated air flow to develop in the gap between the first porous layer and the end of the gap against the curtain, which is characterized by a parabolic velocity profile such that the air in the upper part of the gap along the body from the curtain against the first porous layer and flows in the lower part of the gap along the carrier web in the direction of the curtain, see FIG. 2.
  • the layer thickness of the porous layers depends, among other things, on the porosity and the specific surface of the porous medium.
  • the layer thickness must be dimensioned such that the pressure drop in the air flow through the porous layer is substantially greater, ie, for example by a factor of 100, than the pressure drop in the air flow transverse to the carrier movement in the channel behind the porous layer. at a porosity of 0.4 and a beam width of 1 m results in a layer thickness of approx. 8 mm.
  • the distance d normalized with the gap height H is shown in FIG. 3 as a function of the pressure difference ⁇ p and the location of the zero speed is thus obtained.
  • the two volume flows are shown in FIG. 4 as a function of the pressure difference ⁇ p.
  • the amount of air hitting the curtain and the amount of air that has 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 disruptive air flows in front of the curtain, but that the amount of air is fed in through the porous layer at the outlet of the gap in the correct amount , 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 beam and onto the curtain is allowed strikes from 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)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)

Claims (6)

  1. Procédé de revêtement par rideau d'un support en mouvement avec une matière de revêtement, l'air entraîné par ledit support en mouvement étant extrait, en direction de mouvement du support, avant le rideau dans un fente parallèle resp. concentrique au support, et de l'air étant continuellement amené de manière contrôlée, caractérisé en ce que, par l'intermédiaire d'un corps (1) pourvu, en direction de mouvement (U) du support, d'une première cavité (6) suivie d'un canal d'extraction d'air (7) et d'une deuxième cavité (9) située avant l'extrémité arrière dudit corps et suivie d'un canal d'admission d'air (11), les deux cavités (6, 9) s'étendant sur la largeur entière du support et étant munies, du côté en regard du support, d'une couche (8, 10) en matière poreuse, l'air amené est réglé en fonction de l'air extrait de telle manière qu'un profil de vitesse parabolique est obtenu avec un point (P) à une distance (d) où la vitesse de l'air est égale à zéro.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit profil de vitesse v(y) est calculé selon la formule Hagen-Poiseuille
    u(y) =   vitesse de l'air dans la fente
    p1 =   pression ambiante à l'arrière du rideau
    p0 =   pression négative au dispositif d'extraction
    Δp =   différence de pression = (p1-p0)
    µ =   viscosité de l'air
    L =   longueur de la fente
    H =   hauteur de la fente
    U =   vitesse du support
    y =   coordonnée perpendiculaire à la surface du support.
  3. Dispositif pour la mise en oeuvre du procédé selon la revendication 1, comportant un rouleau de revêtement (3) sur lequel est guidé un support (5), ainsi qu'une installation d'extraction (7) et d'amenée d'air (11) disposée, en direction de mouvement du support, avant le rideau sur un corps (1) formant une fente (4), disposé parallèlement ou concentriquement au support, caractérisé en ce que le corps (1), vu en direction de mouvement (U) du support, comporte une première cavité (6) suivie d'un canal d'extraction d'air (7) et une deuxième cavité (9) située avant l'extrémité arrière dudit corps et suivie d'un canal d'admission d'air (11), les deux cavités (6, 9) s'étendant sur la largeur entière du support et étant munies, du côté en regard du support, d'une couche (8, 10) en matière poreuse, de telle manière qu'une fente uniforme, concentrique ou parallèle s'étend entre ledit support (5) et le corps (1).
  4. Dispositif selon la revendication 3, caractérisé en ce que la première cavité (6) est munie, du côté en regard du support, d'une couche (8) en matière poreuse.
  5. Dispositif selon la revendication 3 ou 4, caractérisé en ce que la hauteur (H) de la fente est comprise entre 0,1 et 1,0 mm, plus particulièrement entre 0,3 et 0,6 mm.
  6. Dispositif selon l'une des revendications 3 à 5, caractérisé en ce que l'écart minimal (L1) entre le côté avant du corps et le côté avant de la première cavité (6) et celui (L3) entre le côté arrière de la première cavité et le côté avant de la deuxième cavité (9) sont compris entre 3 et 15 mm.
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
DE59704675T DE59704675D1 (de) 1997-10-03 1997-10-03 Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers
EP97810732A EP0906789B1 (fr) 1997-10-03 1997-10-03 Procédé et appareil pour le revêtement par rideau d'un support en movement
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 EP0906789A1 (fr) 1999-04-07
EP0906789B1 true 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 (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006001484B4 (de) * 2005-06-15 2015-06-18 Basf Se Vorhangbeschichter mit Grenzschichtablösevorrichtung

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10027034A1 (de) 2000-06-02 2001-12-13 Mitsubishi Hitec Paper Flensbu Verfahren und Vorrichtung zur Vorhangbeschichtung
DE10117667A1 (de) * 2001-04-09 2002-10-10 Bachofen & Meier Ag Buelach Vorrichtung zum Absaugen einer Luftgrenzschicht von einer laufenden Materialbahn
JP4263615B2 (ja) * 2001-12-13 2009-05-13 ダウ グローバル テクノロジーズ インコーポレイティド フローコーティング方法及び装置
DE60209434T2 (de) 2002-12-12 2006-10-19 Metso Paper, Inc. Verfahren und Vorrichtung zum Vorhang- Beschichten
AU2005285221B2 (en) * 2004-09-09 2010-11-11 Avery Dennison Corporation Curtain coating method
DE102004056271A1 (de) 2004-11-22 2006-05-24 Basf Ag Anordnung und Verfahren zur Vorhangbeschichtung bewegter Substrate
DE102006030183A1 (de) * 2006-06-30 2008-01-03 Polytype Converting S.A. Vorhangbeschichter mit poröser Vorhangführungsstruktur, Vorhangführungsstruktur für einen Vorhangbeschichter und Verfahren zur Herstellung der Vorhangführungsstruktur
ATE430217T1 (de) * 2006-09-01 2009-05-15 Mitsubishi Hitec Paper Bielfel Vorhangbeschichtungsverfahren sowie eine dafür verwendete vorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62186966A (ja) * 1986-02-12 1987-08-15 Fuji Photo Film Co Ltd 塗布方法及び装置
EP0440279A1 (fr) * 1990-01-29 1991-08-07 Agfa-Gevaert N.V. Dispositif pour l'enduction sous forme de rideau d'éléments photographiques
DE69026097T2 (de) * 1990-12-12 1996-10-02 Agfa Gevaert Nv Vorhangbeschichter
EP0704752B1 (fr) * 1994-09-27 2001-05-30 ILFORD Imaging Switzerland GmbH Procédé et appareil pour le revêtement par rideau d'un support en mouvement.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112006001484B4 (de) * 2005-06-15 2015-06-18 Basf Se Vorhangbeschichter mit Grenzschichtablösevorrichtung

Also Published As

Publication number Publication date
JPH11188298A (ja) 1999-07-13
DE59704675D1 (de) 2001-10-25
EP0906789A1 (fr) 1999-04-07
US6162502A (en) 2000-12-19

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