EP0584674A2 - Dispositif pour générer une dépression - Google Patents

Dispositif pour générer une dépression Download PDF

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Publication number
EP0584674A2
EP0584674A2 EP93112999A EP93112999A EP0584674A2 EP 0584674 A2 EP0584674 A2 EP 0584674A2 EP 93112999 A EP93112999 A EP 93112999A EP 93112999 A EP93112999 A EP 93112999A EP 0584674 A2 EP0584674 A2 EP 0584674A2
Authority
EP
European Patent Office
Prior art keywords
coating
vacuum
nozzle
carrier material
channel
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
EP93112999A
Other languages
German (de)
English (en)
Other versions
EP0584674B1 (fr
EP0584674A3 (fr
Inventor
Uwe Dipl.-Ing. Gartmann
Hermann Idstein
Günter Dr. Hultzsch
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
Hoechst 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 Hoechst AG filed Critical Hoechst AG
Publication of EP0584674A2 publication Critical patent/EP0584674A2/fr
Publication of EP0584674A3 publication Critical patent/EP0584674A3/fr
Application granted granted Critical
Publication of EP0584674B1 publication Critical patent/EP0584674B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0266—Coating heads with slot-shaped outlet adjustable in length, e.g. for coating webs of different width

Definitions

  • the invention relates to a device for generating a negative pressure on an application layer on a web-shaped carrier material, which is guided over a rotating coating roller, with a pressure chamber located inside the device, which opens into an outlet channel for a pressure medium near the carrier material, and with a coating nozzle for the application of the application layer on the carrier material in a coating gap.
  • an extrusion coating device for applying a coating solution to a strip material moving over a roller is known, with a draw-off nozzle which has an inclined draw-off surface, the angle between the draw-off surface and the axis of the extrusion slot being an obtuse angle.
  • the extrusion coating device is equipped with a vacuum box which is intended to reduce the air entrained at a higher belt speed of the belt material in order not to destroy the contact of the meniscus of the coating solution with the belt.
  • the vacuum is generated with a vacuum pump, not described in more detail, outside the vacuum box. The shape and sealing of the vacuum box is not described in detail.
  • the coating facilities own one vacuum box each, which is connected to a drainage line to discharge excess coating solution.
  • the coating device with the vacuum box and the dryer is in an overpressure chamber.
  • the vacuum box of the coating device has a connection to the outside air, the cross section of this connection being adjustable so that the differential pressure at the meniscus of the coating solution can be set.
  • the device described in DE-A-33 09 343 for applying at least one pouring layer to a moving, web-shaped support has a rotating casting roller guiding the support.
  • a caster is located near the casting roll, separated only by a gap.
  • a suction device with a housing has a vacuum chamber which extends from the gap to a partition and a suction chamber which extends from the partition to an end wall.
  • the partition and / or the end wall are adjustable in the circumferential direction.
  • the vacuum chamber and the suction chamber are connected to each other via a bypass.
  • By moving the partition and / or end wall the volumes of the vacuum and suction chamber are changed. Together with the bypass and the gaps towards the coating belt, these volumes form a pneumatic oscillation system.
  • resonance frequencies can be changed and the damping can be changed by varying the bypass.
  • In the vacuum chamber there is a rotating air roller, which is a source of interference for the uniformity of the coating.
  • Document EP-B - 0 168 986 describes a sliding film coating with negative pressure when the coating solution is applied tangentially.
  • the sliding film flows downwards on a vertical wall and reaches the strip to be coated via a gap.
  • the tape is deflected by a roller so that the coating film lies tangentially on the tape.
  • the gap is connected to a vacuum chamber so that the coating can be influenced.
  • a defined negative pressure or a defined positive pressure can be applied via a switching unit.
  • the negative pressure supports the coating, the positive pressure leads to an immediate interruption of the coating.
  • the pressure chamber is located in the immediate vicinity of the coating gap between the front end of the slideway surface and a coating roller over which the web material is guided.
  • the coating gap is at a location with respect to the coating roller such that the supported web material moves downward at that location and the material to be coated also moves downward.
  • the pressure chamber is arranged above the coating gap, and the angle between the lowest section of the slideway and the tangent to the coating roller in the region of the coating gap is between 170 ° and 180 °.
  • the vacuum space is protected against normal pressure in the area of the coating roller and the strip material by one or more narrow gaps or separated by adjacent seals.
  • the adjacent seals can cause wear or surface defects in the coating roller or the strip material.
  • the gap seals allow larger amounts of air to enter the vacuum box, so that they have to be removed via the vacuum generation system. These high amounts of air entering change depending on the width and thickness of the strip material, so that the vacuum or the gap seal must be readjusted.
  • the air quantities are also the cause of turbulence and vibrations, which can affect the coating meniscus, ie the application bead of the coating solution.
  • the object of the invention is to design a coil coating system with a device for generating a vacuum so that it is equipped without the usual vacuum box and generates a vacuum that is largely free of vibrations and cross-flow.
  • This object is achieved in such a way that the outlet channel running over the entire width of the carrier material moving upwards is arranged at a distance and below the coating gap and a suction zone, that a diffuser part extends the outlet channel downwards and that a vacuum channel extends the suction zone connects to the diffuser part of the outlet duct.
  • the wall of the vacuum channel is formed on the one hand by the moving carrier material and on the other hand by a nozzle wall which is held in place by means of magnets which are embedded in an upper part of the device.
  • the nozzle wall runs vertically downwards and is flat.
  • a narrowing distribution channel leads from the pressure chamber to a Laval nozzle, which extends over the entire coating width of the carrier material, and connects to the narrowest cross section of the Laval nozzle, the diffuser part of the outlet channel.
  • the advantage of the invention is that the negative pressure is generated directly or at the point where there is a direct need, as a result of which longer distances and thus vibrating air columns are avoided.
  • Another advantage of the invention includes in that no sealing is required and thus instabilities are avoided, so that interference is excluded.
  • Another advantage is that the cleaning of the device according to the invention, compared to known systems, is easy to accomplish due to the simple construction.
  • the principle of a device 1 for generating a vacuum at an application layer 5 is explained with reference to FIG. 1.
  • the generation of negative pressure is based on the principle of the known water or steam jet pump.
  • Compressed air is passed through a channel of the device 1 in the direction of arrow A and emerges from a Laval nozzle 15 along the circumference of a coating roller 3.
  • the Laval nozzle 15 is designed in such a way that only one half of the complete nozzle is used, this half being spatially divided so that a slot-shaped cross section is formed in the nozzle, which extends over the application width of the carrier material 4 on the coating roller 3.
  • the plane of symmetry of the Laval nozzle 15 coincides with the inner wall of the device 1, which lies opposite the circumferential surface of the coating roller 3.
  • the compressed air emerging from the Laval nozzle 15 exerts a suction or negative pressure above the Laval nozzle 15 on the meniscus of the application layer 5 or on the application layer as such.
  • FIG. 2 shows in perspective the device 1 for generating negative pressure on a coating roller 3, via which the carrier material 4 to be coated is led.
  • the device 1 is supplied with compressed air via a distributor unit 23.
  • compressed air is fed symmetrically from the distributor unit 23 via inflow openings 13 and 22 of the device 1.
  • Slidable seals 27 serve to limit the outlet width of the compressed air.
  • the coating nozzle 2 is not shown.
  • the device 1 according to the invention on a coating roller 3 is shown in section.
  • the carrier material 4 for example a plastic, paper or metal strip, is guided over the coating roller 3.
  • An arrow 6 indicates the running direction of the carrier material 4, which moves upward over the circumference of the coating roller 3.
  • the coating nozzle 2 is located above the device 1, so that the application layer 5, which emerges from the coating nozzle 2, is guided away from the device 1.
  • the upper part 7 and the lower part 8 are connected to one another by screws 11.
  • the nozzle wall 9 is held by magnets 10, which are embedded in the upper part 7.
  • a pressure chamber 24 which has two mutually opposite inflow openings 13, 22 via which compressed air is fed in symmetrically, as was described with reference to FIG becomes.
  • the pressure chamber is pressurized with compressed air from 2.5 to 3.8 bar.
  • the inflow opening 13 is indicated in the cross section of the lower part 8.
  • the compressed air supplied flows from the pressure chamber 24 through a distribution channel 14, which narrows upwards, to the Laval nozzle 15, which extends over the entire coating width.
  • the Laval nozzle 15 is delimited by the lower part of the nozzle wall 9 and by the inner wall 26 of the lower part 8 of the device 1. This inner wall 26 is inclined to the vertical and diverges downwards.
  • the displaceable seals 27 are present in the distributor channel 14, which are indicated schematically by dashed lines in FIG. 3 and which adapt the length of the gap of the Laval nozzle 15 to the coating width on the carrier material 4.
  • the displaceable seals 27 cover the inflow of compressed air to the Laval nozzle 15.
  • a narrow cross section 16 of the Laval nozzle 15 is followed by a short diffuser part 20 and an outlet duct 19, in which the outgoing compressed air from the Laval nozzle 15 mixes with the air from a vacuum duct 18 and with the air molecules carried in by the carrier material 4.
  • the outlet channel 19 is arranged at a distance and below the coating gap 25 of the coating nozzle 2.
  • the diffuser part 20 merges into the outlet channel 19, which widens downwards.
  • the vacuum channel 18 connects the outlet channel 19 with a suction zone 17 near the meniscus of the application layer 5, which the latter during Forms transition from the gap of the coating nozzle 2 to the carrier material 4.
  • the wall of the vacuum channel 18 is formed on the one hand by the moving carrier material 4 and on the other hand by the nozzle wall 9.
  • the cross section of the Laval nozzle 15 increases in the direction of the diffuser part 20 of the outlet channel 19.
  • the nozzle wall 9 runs vertically downwards and is flat, while the inner wall 26 of the lower part 8 of the device 1, as already mentioned above, runs obliquely to the vertical and diverged downwards.
  • In the upper part 7 of the device 1 there is a measuring channel 21 for measuring the negative pressure prevailing in the negative pressure channel 18, which is generally up to 7 mbar.
  • the negative pressure which arises in the outlet channel 19 acts on the suction zone 17 in the area of the meniscus of the application layer 5 via the negative pressure channel 18. This stabilizes the coating and only enables coating with application layers that have a low wet film weight.
  • the compressed air fed into the device 1 emerges in such a way that a negative pressure is created laterally from the outlet point and a flow is thereby exerted on an air layer which adheres to the carrier layer 4.
  • the pressure chamber can be subdivided into individually segmented distributor chambers, which can then optionally be pressurized with compressed air, so that the length of the nozzle gap of the Laval nozzle can in fact be adapted to the respective coating width present.
  • the device 1 can be used not only to generate a negative pressure on a carrier layer 4, but also to remove air cushions when rolling up tapes or plastic films. It is also possible to expose the compressed air fed in to an AC corona discharge, which leads to ionization of the compressed air, which then unloads the carrier material 4, which is moved upward, before the application layer 5 is applied.
EP93112999A 1992-08-22 1993-08-13 Appareil pour enduire un bande Expired - Lifetime EP0584674B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4227908A DE4227908A1 (de) 1992-08-22 1992-08-22 Vorrichtung zum Erzeugen eines Unterdrucks
DE4227908 1992-08-22

Publications (3)

Publication Number Publication Date
EP0584674A2 true EP0584674A2 (fr) 1994-03-02
EP0584674A3 EP0584674A3 (fr) 1994-03-16
EP0584674B1 EP0584674B1 (fr) 1998-11-25

Family

ID=6466186

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93112999A Expired - Lifetime EP0584674B1 (fr) 1992-08-22 1993-08-13 Appareil pour enduire un bande

Country Status (4)

Country Link
US (1) US5443638A (fr)
EP (1) EP0584674B1 (fr)
JP (1) JPH06182848A (fr)
DE (2) DE4227908A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5738724A (en) * 1996-08-06 1998-04-14 Westvaco Corporation Actuator assembly for coater blade load adjustment
DE19839916A1 (de) * 1998-09-02 2000-03-09 Jagenberg Papiertech Gmbh Verfahren und Vorrichtung zur Verminderung des Volumens oder Drucks eines Fluids, das von sich bewegenden Oberflächen in einen Spalt eingeschleppt wird
DE19848809A1 (de) * 1998-10-22 2000-04-27 Voith Sulzer Papiertech Patent Vorrichtung und Verfahren zum Aufwickeln einer Materialbahn, insbesondere Papierbahn
DE19848807A1 (de) * 1998-10-22 2000-04-27 Voith Sulzer Papiertech Patent Vorrichtung zum Aufwickeln einer Materialbahn
JP4059709B2 (ja) * 2002-05-29 2008-03-12 富士フイルム株式会社 薄膜塗布方法及びその装置
US7092855B2 (en) * 2003-05-30 2006-08-15 Avery Dennison Corporation Thermo-stable coating die design method and apparatus
FI115547B (fi) * 2003-12-22 2005-05-31 Metso Paper Inc Ilmarajakerroksen hallinta
CA2836934C (fr) 2011-05-27 2017-02-28 Ak Steel Properties, Inc. Appareil et procede de revetement menisque
US11951509B2 (en) 2013-09-10 2024-04-09 Awi Licensing Llc System for applying a coating to a workpiece
US9266141B2 (en) * 2013-09-10 2016-02-23 Awi Licensing Company System for applying a coating to a workpiece
DE102014003632A1 (de) 2014-03-14 2015-09-17 Olbrich Gmbh Verfahren und Vorrichtung zum Beschichten eines bahnförmigen Trägermaterials

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU57983A1 (fr) * 1968-02-14 1969-05-22
US3640752A (en) * 1966-05-02 1972-02-08 Fuji Photo Film Co Ltd Coating method
FR2270952A1 (fr) * 1974-05-15 1975-12-12 Agfa Gevaert Ag
EP0038526A1 (fr) * 1980-04-17 1981-10-28 E.I. Du Pont De Nemours And Company Appareil pour revêtir une bande avec un matériau de couchage visqueux
US4490418A (en) * 1982-04-16 1984-12-25 Fuji Photo Film Co., Ltd. Coating method and apparatus
EP0168986A2 (fr) * 1984-07-06 1986-01-22 E.I. Du Pont De Nemours And Company Appareil pour l'application d'au moins une couche et procédé pour faire fonctionner cet appareil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE513714A (fr) * 1951-08-23 1900-01-01
US3735729A (en) * 1970-09-24 1973-05-29 Eastman Kodak Co Apparatus for coating a continuous web
US3916043A (en) * 1971-11-15 1975-10-28 Eastman Kodak Co Method of coating a spliced web
CH624526B (de) * 1977-12-19 Polytype Ag Verfahren und vorrichtung zum aufbringen von fliessfaehigen auftragsmedien auf zweidimensionale bahn- bzw. bogenfoermige substrate oder dreidimensionale formkoerper mit gewoelbten oberflaechen.
DE3022955C2 (de) * 1980-06-19 1982-12-16 Jagenberg-Werke AG, 4000 Düsseldorf Vorrichtung zum Regeln der Auftragsstärke beim Beschichten laufender Materialbahnen
US4445458A (en) * 1982-07-21 1984-05-01 E. I. Du Pont De Nemours And Company Beveled edge metered bead extrusion coating apparatus
DE3309343C2 (de) * 1983-03-16 1986-08-14 Du Pont de Nemours (Deutschland) GmbH, 4000 Düsseldorf Vorrichtung zum Auftragen mindestens einer Gießschicht
EP0286755B1 (fr) * 1987-04-16 1995-03-15 Yasui Seiki Co., Ltd. Appareillage d'alimentation pour une coucheuse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3640752A (en) * 1966-05-02 1972-02-08 Fuji Photo Film Co Ltd Coating method
LU57983A1 (fr) * 1968-02-14 1969-05-22
FR2270952A1 (fr) * 1974-05-15 1975-12-12 Agfa Gevaert Ag
EP0038526A1 (fr) * 1980-04-17 1981-10-28 E.I. Du Pont De Nemours And Company Appareil pour revêtir une bande avec un matériau de couchage visqueux
US4490418A (en) * 1982-04-16 1984-12-25 Fuji Photo Film Co., Ltd. Coating method and apparatus
EP0168986A2 (fr) * 1984-07-06 1986-01-22 E.I. Du Pont De Nemours And Company Appareil pour l'application d'au moins une couche et procédé pour faire fonctionner cet appareil

Also Published As

Publication number Publication date
DE59309151D1 (de) 1999-01-07
US5443638A (en) 1995-08-22
JPH06182848A (ja) 1994-07-05
EP0584674B1 (fr) 1998-11-25
DE4227908A1 (de) 1994-02-24
EP0584674A3 (fr) 1994-03-16

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