EP0906789A1 - Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers - Google Patents
Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers Download PDFInfo
- 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
Links
- 238000000034 method Methods 0.000 title claims description 10
- 238000007766 curtain coating Methods 0.000 title 1
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 239000011148 porous material Substances 0.000 claims abstract description 5
- 238000000605 extraction Methods 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 4
- 238000009736 wetting Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
Images
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)
Abstract
Description
- Figur 1
- zeigt im Schnitt einen Teil der erfindungsgemässen Vorrichtung,
- Figur 2
- zeigt das Geschwindigkeitsprofil im Spalt,
- Figur 3
- zeigt den Ort der Nullgeschwindigkeit der Spaltströmung, und
- Figur 4
- zeigt die Volumenströme für die Spaltströmung.
- u(y)
- = Geschwindigkeit der Luft im Spalt
- p1
- = Umgebungsdruck hinter dem Vorhang
- p0
- = Unterdruck bei der Saugvorrichtung
- Δp
- = Druckdifferenz = (p1-p0)
- µ
- = Viskosität der Luft
- L
- = Länge des Spaltes
- H
- = Höhe des Spaltes
- U
- = Geschwindigkeit des Trägers
- y
- = Koordinate senkrecht zur Trägeroberfläche
Claims (6)
- Verfahren zur Vorhangbeschichtung eines bewegten Trägers mit einem Beschichtungsmaterial, wobei in einem parallel, bzw. konzentrisch zum Träger ausgebildeten Spalt, in Laufrichtung des Trägers gesehen, die vom bewegten Träger mitgeführte Luft vor dem Vorhang abgesaugt wird und kontrolliert Luft stetig zugeführt wird, dadurch gekennzeichnet, dass die zugeführte Luft in Funktion der abgesaugten Luft derart eingestellt wird, dass sich ein parabolisches Geschwindigkeitsprofil entwickelt mit einem Punkt (P) in einem Abstand (d) vom Träger, in dem die Luftgeschwindigkeit gleich Null ist.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass das Geschwindigkeitsprofil gemäss der Hagen-PoiseuilleFormel (1) berechnet wird.
- Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 mit einer Giesswalze (3) zur Führung eines Trägers (5) und einer in Bewegungsrichtung des Trägers vor dem Vorhang (2) angeordneten Absaug- (7) und LuftzuführEinrichtung (11), die an einem, einen Spalt (4) bildenden und parallel oder konzentrisch zum Träger angeordneten Körper (1) vorgesehen sind, dadurch gekennzeichnet, dass der Körper (1), in der Laufrichtung (U) des Trägers gesehen, einen mit anschliessendem Luftabsaugkanal (7) versehenen ersten Hohlraum (6) und vor dem Körper-Ende einen zweiten Hohlraum (9) mit sich daran anschliessendem Luftzuführkanal (11) aufweist, wobei sich beide Hohlräume (6, 9) über die ganze Breite des Trägers erstrecken und trägerseitig mit einer Schicht (8, 10) aus porösem Material versehen sind derart, dass sich ein gleichförmiger, konzentrischer oder parallele, Spalt (4) zwischen dem Träger (5) und dem Körper (1) erstreckt.
- Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass der erste Hohlraum (6) trägerseitig mit einer Schicht (8) aus porösem Material versehen ist.
- Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass die Höhe (H) des Spaltes 0.1 - 1.0 mm, insbesondere 0.3 - 0.6 mm beträgt.
- Vorrichtung nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, dass die Mindestlänge (L1)zwischen Körperanfang und Anfang des ersten Hohlraums (6) und (L3) zwischen Ende des ersten Hohlraums und Anfang des zweiten Hohlraums (9) 3 - 15 mm betragen.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97810732A EP0906789B1 (de) | 1997-10-03 | 1997-10-03 | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
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 (de) | 1997-10-03 | 1997-10-03 | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0906789A1 true EP0906789A1 (de) | 1999-04-07 |
EP0906789B1 EP0906789B1 (de) | 2001-09-19 |
Family
ID=8230414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97810732A Expired - Lifetime EP0906789B1 (de) | 1997-10-03 | 1997-10-03 | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
Country Status (4)
Country | Link |
---|---|
US (1) | US6162502A (de) |
EP (1) | EP0906789B1 (de) |
JP (1) | JPH11188298A (de) |
DE (1) | DE59704675D1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001091917A1 (de) | 2000-06-02 | 2001-12-06 | Mitsubishi Hitec Paper Flensburg Gmbh | Verfahren und vorrichtung zur vorhangbeschichtung |
WO2006056386A1 (de) | 2004-11-22 | 2006-06-01 | Basf Aktiengesellschaft | Anordnung und verfahren zur vorhangbeschichtung bewegter substrate |
WO2006134052A1 (de) | 2005-06-15 | 2006-12-21 | Basf Aktiengesellschaft | Vorhangbeschichter mit grenzschichtablösevorrichtung |
WO2008000507A1 (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 |
Families Citing this family (5)
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 (en) * | 2001-12-13 | 2011-06-07 | Dow Global Technologies Inc. | Method and apparatus for curtain coating |
ATE318656T1 (de) | 2002-12-12 | 2006-03-15 | Metso Paper Inc | Verfahren und vorrichtung zum vorhang- beschichten |
CN101014418B (zh) * | 2004-09-09 | 2010-09-01 | 艾利丹尼森公司 | 帘式涂布方法 |
DE502006003618D1 (de) * | 2006-09-01 | 2009-06-10 | Mitsubishi Hitec Paper Bielefe | Vorhangbeschichtungsverfahren sowie eine dafür verwendete Vorrichtung |
Citations (4)
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 (de) * | 1990-01-29 | 1991-08-07 | Agfa-Gevaert N.V. | Vorhangbeschichtungsvorrichtung für photographische Elemente |
EP0489978A1 (de) * | 1990-12-12 | 1992-06-17 | Agfa-Gevaert N.V. | Vorhangbeschichter |
EP0704752A1 (de) * | 1994-09-27 | 1996-04-03 | Ilford Ag | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
-
1997
- 1997-10-03 EP EP97810732A patent/EP0906789B1/de not_active Expired - Lifetime
- 1997-10-03 DE DE59704675T patent/DE59704675D1/de not_active Expired - Lifetime
-
1998
- 1998-10-02 US US09/165,688 patent/US6162502A/en not_active Expired - Fee Related
- 1998-10-05 JP JP10282504A patent/JPH11188298A/ja active Pending
Patent Citations (4)
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 (de) * | 1990-01-29 | 1991-08-07 | Agfa-Gevaert N.V. | Vorhangbeschichtungsvorrichtung für photographische Elemente |
EP0489978A1 (de) * | 1990-12-12 | 1992-06-17 | Agfa-Gevaert N.V. | Vorhangbeschichter |
EP0704752A1 (de) * | 1994-09-27 | 1996-04-03 | Ilford Ag | Verfahren und Vorrichtung zur Vorhangbeschichtung eines bewegten Trägers |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001091917A1 (de) | 2000-06-02 | 2001-12-06 | Mitsubishi Hitec Paper Flensburg Gmbh | Verfahren und vorrichtung zur vorhangbeschichtung |
WO2006056386A1 (de) | 2004-11-22 | 2006-06-01 | Basf Aktiengesellschaft | Anordnung und verfahren zur vorhangbeschichtung bewegter substrate |
WO2006134052A1 (de) | 2005-06-15 | 2006-12-21 | Basf Aktiengesellschaft | Vorhangbeschichter mit grenzschichtablösevorrichtung |
WO2008000507A1 (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 |
Also Published As
Publication number | Publication date |
---|---|
US6162502A (en) | 2000-12-19 |
JPH11188298A (ja) | 1999-07-13 |
DE59704675D1 (de) | 2001-10-25 |
EP0906789B1 (de) | 2001-09-19 |
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