EP1239974A1 - Method and device for coating a running material web - Google Patents
Method and device for coating a running material webInfo
- Publication number
- EP1239974A1 EP1239974A1 EP00985009A EP00985009A EP1239974A1 EP 1239974 A1 EP1239974 A1 EP 1239974A1 EP 00985009 A EP00985009 A EP 00985009A EP 00985009 A EP00985009 A EP 00985009A EP 1239974 A1 EP1239974 A1 EP 1239974A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- separating element
- separating
- curtain
- web
- 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
Links
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
- B05C5/005—Curtain coaters
-
- 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
- the invention relates to a method for coating a running material web, in which the coating material is applied to the web in a free-falling curtain and the edges of the curtain are separated on both sides to adjust the coating width before the impact on the material web by means of separating elements.
- the invention further relates to a coating device which is particularly suitable for carrying out a method according to the invention and a separating element which is particularly suitable for use in the coating device.
- curtain coaters are known for coating running material webs such as paper or cardboard webs, plastic or metal foils, in which the coating material (pigment coating color, plastic dispersions etc.) is applied to the material web from a slot nozzle in a free-falling curtain.
- the two curtain edges each have a guide element which extends from the slot nozzle down to the vicinity of the material web respectively.
- the curtain edges are separated before the curtain impacts the material web by means of separating elements which are arranged transversely to the web running direction below the guide elements.
- the two separating elements each have an upwardly projecting separating edge and an outwardly inclined upper collecting surface, on which the material of the curtain edge separated from the separating edge is drained outwards.
- curtain coater is used to apply dispersion pressure-sensitive adhesives to a web-shaped separating element in the production of self-adhesive labels, Adhesive film strips etc. or used to apply a barrier layer in the production of a moisture-impermeable packaging material, it is necessary to be able to adjust the coating width differently over a wide range, since the web width of the material webs to be coated varies considerably.
- the invention is therefore based on the object of improving a method and a device of the generic type in such a way that widely differing coating widths can be set without impairing the coating quality.
- This object is achieved in that a narrower curtain is first produced on each edge by means of a first outer separating element, which is then adjusted to the desired coating width on each edge by means of a second, inner separating element.
- the arrangement of two separating elements on each side makes it possible to cut off large lateral areas of the curtain in order to set a very small coating width without coating errors occurring at the longitudinal edges.
- internal separating elements can be used, the separating edge of which is only a small height.
- the main part of the stream of coating material to be separated is separated from the first outer separating elements, the separating edges of which extend sufficiently high to allow a
- curtain inner surface also serves as a guide element for the curtain edge. If the height is too high, the edge of the curtain will come off the inner surface too far above the web to be coated. Then its position fluctuates and a bead forms on the coating material, which is applied to the material web.
- Another object of the invention is to provide a separating element which is particularly suitable for use in a coating provision according to the invention.
- FIG. 1 shows a longitudinal section through a curtain coater according to the invention
- FIG. 2 shows the edge area as a cross section through the curtain
- FIG. 6 shows the associated top view and FIG. 7 shows the associated cross section
- the coating device shown in the figures is used to apply a dispersion pressure sensitive adhesive (eg an acrylate) in aqueous solution to a siliconized paper web 1. Because of its advantageous properties, the device can also be used to apply other dispersions to paper, plastic films or thin tapes or for Use a coating color to coat paper or cardboard webs.
- a dispersion pressure sensitive adhesive eg an acrylate
- the slot nozzle 2 contains a slot nozzle 2 which is suspended above the run of the web 1 in the frame of the application device.
- the slot nozzle 2 is connected to a feed, not shown, for coating material and has on its underside a slot-shaped opening from which the coating material emerges and one free-falling curtain 3 forms, which falls on the surface of the web.
- the width of the slot of the nozzle 2 is larger than the maximum width of the web 1.
- the web 1 is supported over its entire width by a support roller 4.
- the support roller 4 is fed the uncoated web 1 from below. After coating, the web 1 leaves the support roller 4 approximately in the horizontal direction.
- the slot nozzle 2 is suspended in a height-adjustable manner above the apex line of the support roller 4 in order to be able to adjust the distance of the outlet slot from the web 1 and thus the height of fall of the coating material.
- the slot nozzle 2 is horizontally movable in and against the web running direction, so that it can be moved against the web running direction from the area above the apex line of the support roller 4 to an area in front of the support roller 4.
- the slot nozzle 3 is then above a collecting trough 5, which is arranged directly in front of the support roller 4 above the web 1. In this position, at the start of the coating device, a stable curtain 3 is first generated, which falls into the collecting trough 5.
- the slot nozzle 2 with the elements attached to it is moved in the web running direction - to the right in FIG. 1 - in its working position above the support roller 4.
- the area between the outlet-side end of the collecting trough 5 and the apex area of the counter-roller 4 is covered by a guide plate 6 which extends over the working width.
- a scraper 7 At the end of the guide plate 6 there is a scraper 7 which reduces the air boundary layer adhering to the web 1 before the curtain 3 impacts.
- strip-shaped guide elements 8 extending downward to the vicinity of the web 1 are fastened on both sides of the slot nozzle 2.
- the two guide elements 8 are each fastened directly next to the outlet gap of the slot nozzle 2, and their inside facing the curtain 3 is flat.
- the inside of each guide element 8 can be rinsed with an auxiliary liquid that reduces the surface tension, for example with water.
- the auxiliary liquid flowing downwards from the inside down on the guide elements 8 causes the curtain 3 adheres better to the guide elements 8.
- the guide elements 8 can be designed inclined inwards.
- the limiting means are each attached to the frame of the nozzle 2, so that they are moved when the nozzle 2 is moved in or against the direction of web travel. In addition, they are slidably mounted transversely to the web running direction in order to be able to adjust the width of the curtain 3 falling on the web 1 to widely differing web widths.
- the edge delimiting means on both sides are constructed and arranged in mirror image to one another. They can be adjusted crossways separately.
- the edge-limiting means each consist of two blade-shaped ones, essentially vertical and arranged at a certain distance from one another
- Separating elements 9, 10, which are attached to the long sides of a base plate 11. Both separating elements 9, 10 end in a sharp separating edge, the height of the separating edge of the inner separating element 9 being chosen so low that the curtain 3 does not detach from the inner surface 12 before it hits the web 1.
- the inner separating element 9 forms with the outer separating element 10 and the base plate 11 an edge groove 13 which removes the coating material collected between the two separating elements 9, 10.
- the separating elements 9, 10 are extended so far against the web running direction to form the channel 13 that their end extends into the region of the guide plate 6.
- the base plate 11 slopes downward so that the collected coating material runs in the direction of the collecting trough 5.
- each transverse channel 14 is fastened to catch the outer edge of the curtain.
- the length of each transverse trough 14 measured transversely to the direction of web travel is selected such that when a minimum coating width is set, its outer end extends below the associated guide element 8, that is to say beyond the lateral end of the outlet slot of the nozzle 2.
- Each transverse channel 14 has side walls 15 which extend in height to the separating edge of the associated separating element 10.
- the separating element 10 forms the inner boundary wall of the channel 14. Its height is sufficiently large that the separated volume flow of coating material with minimal coating width can be collected and discharged without coating material overflowing.
- the transverse channels 14 preferably each extend inwardly inclined, and a drain channel 16 is fastened to their inner end in the region of the separating element 10. Via the gutter 16, which is also counter to the web running direction
- An inwardly inclined cross channel 14 with a discharge channel 16 arranged next to the separating element 10 has two advantages: On the one hand, the collecting trough 5 only needs to extend over the axial length of the support roller 4, since the discharge channel 16 is still in the region of the maximum coating width Counter roll is located. On the other hand, the outer end of the transverse trough 14 does not collide with the support roller 4 if the separating knives 9, 10 with the chute 14 are moved very far inwards to set a minimum coating width, as shown in broken lines in FIG. 4.
- the two separating elements 9, 10 with the transverse channel 14 attached to them are adjusted so far that the inner separating knife 9 is arranged in the region of the desired coating edge.
- the outer separating element 10 with a greater height separates the outer part of the curtain edge, which is caught by the transverse channel 14 and passed via the drain channel 16 into the collecting trough 5.
- the result is a narrow, inner curtain 3, the edges of which are then separated from the inner separating elements 9 and drained off via the edge channels 13.
- the inner surface 12 of each separating element 9 serves as a guide for the edge of the curtain part which is applied to the web 1.
- the low height of the separating element 9 ensures that the curtain edges do not detach from it before impacting the web 1.
- a suction line 17 is arranged on the underside of each edge groove 13, said suction line 17 via a suction channel 18 in the base plate 11 in a suction slot 19 in the inside 12 of the inner separating element 9 empties.
- the suction slit 19 runs at a distance of 0.1 mm - 1 mm from the web 1 on the underside of the separating element 9 in the area of the curtain 3. In the web running direction it has a length of 2 mm - 15 mm, preferably 3 mm - 5 mm , so that the suction suction function is guaranteed with corresponding fluctuations in the curtain 3.
- the suction line device 17 extends below the transverse channel 14 to the outside and is connected to a pump with a separator for the coating material. In order to prevent caking in the suction slot 19, it is rinsed with water.
- two water lines 20 lead below the base plate 11 to the suction slot 19, which open into the suction channel 18 at a short distance from the latter. The rinsing water is carried away together with the suctioned coating material via the suction line 17.
- the length of the suction channel 18 in the base plate 11 is determined by the distance between the two separating elements 9, 10 from one another. It should be kept as low as possible so that excessive pressure losses do not occur and caking in the suction channel 18 is avoided.
- a short suction channel 18 is made possible by a narrowly designed edge channel 13, which only has to discharge a small flow of separated coating material.
- auxiliary liquid is preferably fed in such a way that it emerges at the separating edge of the separating element 9 and flows down on both sides of the separating element 9.
- the emerging auxiliary liquid thus forms a liquid cushion immediately above the separating edge of the separating element 9, which prevents coating material from caking on the separating edge.
- the separating element 9 is constructed in two parts: on the base plate 11, a side wall 21 which ends in a sharp edge is fastened, in the upper part of which a vertical groove 22 is incorporated on the outside. Outside on the wall
- a thin, blade-shaped cover plate 23 is fastened, which covers the groove 22 and thus forms a slot-shaped channel which is open at the separating edge.
- a water supply 24 opens into the channel. The water supplied by means of the water supply 24 emerges at the top in the region of the separating edge and runs both on the inner surface 12 of the sheet 21 and the auxiliary liquid stabilizing the curtain 3, and along the
- Cooling creates condensation on the outside, which forms a sliding film for the coating material.
- the cooling of the separating element 9 can be brought about in that an inlet and outlet for cooling water leads into corresponding cavities within the separating element 9.
- the cooling can also be effected by means of one or more Peltier elements which are fastened, for example, to the side wall 21 within the edge channel 13. Cooling elements designed in this way have the advantage that no external cooling unit is required.
Landscapes
- Coating Apparatus (AREA)
- Reverberation, Karaoke And Other Acoustics (AREA)
- Paper (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19962844 | 1999-12-23 | ||
DE19962844A DE19962844A1 (en) | 1999-12-23 | 1999-12-23 | Method and device for coating a running material web |
PCT/EP2000/011170 WO2001047643A1 (en) | 1999-12-23 | 2000-11-11 | Method and device for coating a running material web |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1239974A1 true EP1239974A1 (en) | 2002-09-18 |
EP1239974B1 EP1239974B1 (en) | 2007-08-22 |
Family
ID=7934375
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00985009A Expired - Lifetime EP1239974B1 (en) | 1999-12-23 | 2000-11-11 | Device for coating a running material web |
Country Status (6)
Country | Link |
---|---|
US (1) | US6709517B1 (en) |
EP (1) | EP1239974B1 (en) |
AT (1) | ATE370797T1 (en) |
AU (1) | AU2157401A (en) |
DE (2) | DE19962844A1 (en) |
WO (1) | WO2001047643A1 (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE20221952U1 (en) † | 2002-06-24 | 2009-08-20 | Voith Patent Gmbh | Apparatus for two-sided coating and drying of a material web, in particular of paper or cardboard |
DE10316999A1 (en) * | 2003-04-11 | 2004-10-28 | Bachofen & Meier Ag | Device for coating a running material web |
DE10349117A1 (en) * | 2003-10-22 | 2005-05-25 | Voith Paper Patent Gmbh | Machine for applying a liquid or pasty application medium to the surface of a moving material web |
DE10359676A1 (en) * | 2003-12-18 | 2005-07-14 | Voith Paper Patent Gmbh | Machine for one-sided or two-sided application of a liquid or pasty application medium on the surface of a moving material web and associated operating method |
DE10359677A1 (en) * | 2003-12-18 | 2005-07-14 | Voith Paper Patent Gmbh | Method for one-sided or double-sided curtain or veiling application to the surface of a moving material web, in particular of paper or cardboard |
DE102005059966B4 (en) * | 2005-12-15 | 2007-10-31 | Polytype Converting S.A. | Curtain coater with laterally adjustable fold |
US8522713B2 (en) | 2008-07-22 | 2013-09-03 | Ricoh Company, Ltd. | Curtain coating method and curtain coating apparatus |
JP5169571B2 (en) * | 2008-07-22 | 2013-03-27 | 株式会社リコー | Curtain coating method and apparatus |
FI120885B (en) * | 2008-11-20 | 2010-04-15 | Metso Paper Inc | Kantstyrare |
JP2017170365A (en) * | 2016-03-24 | 2017-09-28 | デクセリアルズ株式会社 | Painting apparatus |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1577622B2 (en) | 1964-07-24 | 1973-07-05 | Artos Dr Ing Meier Windhorst KG, 2000 Hamburg | DEVICE FOR COATING MOVING TRACKS |
US4559896A (en) * | 1983-09-15 | 1985-12-24 | Ciba Geigy Corporation | Coating apparatus |
JPS6135880A (en) | 1984-07-30 | 1986-02-20 | Fuji Photo Film Co Ltd | Coating apparatus |
DE3468544D1 (en) * | 1984-10-05 | 1988-02-11 | Agfa Gevaert Nv | Method and apparatus for curtain coating |
EP0606038B1 (en) * | 1993-01-07 | 1999-08-18 | Eastman Kodak Company | Edge removal apparatus for curtain coating |
DE69427145T2 (en) * | 1993-10-18 | 2001-11-15 | Eastman Kodak Co | Curtain coating method and device |
JP3621204B2 (en) * | 1996-08-20 | 2005-02-16 | 三菱製紙株式会社 | Curtain coating apparatus and coating method |
EP0958718B1 (en) | 1996-12-16 | 2002-03-13 | Vantico AG | Process and apparatus for the coating of boards |
US6468592B1 (en) * | 1997-08-15 | 2002-10-22 | Jagenberg Papiertechnik Gmbh | Applying a pigment coating to a paper or cardboard strip |
DE19735558A1 (en) | 1997-08-16 | 1999-02-25 | Bosch Gmbh Robert | Device and method for heating domestic water |
US6117236A (en) * | 1998-03-18 | 2000-09-12 | Eastman Kodak Company | Curtain coating apparatus and method with continuous width adjustment |
-
1999
- 1999-12-23 DE DE19962844A patent/DE19962844A1/en not_active Ceased
-
2000
- 2000-11-11 AT AT00985009T patent/ATE370797T1/en not_active IP Right Cessation
- 2000-11-11 AU AU21574/01A patent/AU2157401A/en not_active Abandoned
- 2000-11-11 EP EP00985009A patent/EP1239974B1/en not_active Expired - Lifetime
- 2000-11-11 WO PCT/EP2000/011170 patent/WO2001047643A1/en active IP Right Grant
- 2000-11-11 DE DE50014595T patent/DE50014595D1/en not_active Expired - Lifetime
- 2000-11-11 US US10/168,364 patent/US6709517B1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0147643A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001047643A1 (en) | 2001-07-05 |
DE50014595D1 (en) | 2007-10-04 |
DE19962844A1 (en) | 2001-07-05 |
EP1239974B1 (en) | 2007-08-22 |
US6709517B1 (en) | 2004-03-23 |
AU2157401A (en) | 2001-07-09 |
ATE370797T1 (en) | 2007-09-15 |
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