EP0609768A1 - Dispositif d'enduction pour l'application d'une couche humide mince - Google Patents

Dispositif d'enduction pour l'application d'une couche humide mince Download PDF

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Publication number
EP0609768A1
EP0609768A1 EP94101160A EP94101160A EP0609768A1 EP 0609768 A1 EP0609768 A1 EP 0609768A1 EP 94101160 A EP94101160 A EP 94101160A EP 94101160 A EP94101160 A EP 94101160A EP 0609768 A1 EP0609768 A1 EP 0609768A1
Authority
EP
European Patent Office
Prior art keywords
lip
coating device
elastic
lips
clamping
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
EP94101160A
Other languages
German (de)
English (en)
Other versions
EP0609768B1 (fr
Inventor
Günter Dr. Dipl.-Chem. Hultzsch
Hermann Idstein
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
Agfa Gevaert AG
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 Agfa Gevaert AG, Hoechst AG filed Critical Agfa Gevaert AG
Publication of EP0609768A1 publication Critical patent/EP0609768A1/fr
Application granted granted Critical
Publication of EP0609768B1 publication Critical patent/EP0609768B1/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
    • 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

Definitions

  • the invention relates to a coating device for applying thin wet films to a support, which is guided continuously over a support surface.
  • the distance between the lips and the substrate or carrier to be coated plays an important role in the case of the slot die coating.
  • lower wet film thicknesses or higher coating speeds require a smaller nozzle spacing, or complex process technologies must also be used, e.g. in the form of a negative pressure applied to the meniscus of the wet film.
  • a wide-slot nozzle wrapped in the carrier film is used to apply wet films of reduced thickness. Practical difficulties arise when metal strips are to be coated, since because of their strong resilient restoring force, these can only be carried out with difficulty over the curved slot die.
  • the base film moves at a predetermined linear speed and in a predetermined direction.
  • the applicator comprises a head provided with a bore parallel to the axis of the head for receiving the liquid, a slot connecting the bore to a surface of the head, a trailing edge portion located adjacent to the slot on the upstream side of the slot, which has a chamfer the width of which is less than or equal to 50 microns but greater than the diameter of each grain of the material of the trailing edge portion, and a doctor edge portion disposed adjacent to the slot on the downstream side of the slot with respect to the running direction, the doctor edge portion being chamfered having a width of about 2 to 3 microns, which is provided on the upstream edge of the surface of the doctor edge section.
  • the object of the invention is to carry out wet film coatings with slot dies at high speeds of the support and with low wet film thicknesses, without causing defects in the wet film, in the support or by contacting the support with the The slot lip is damaged or the tape tears off.
  • a slot nozzle of the coating device is equipped with at least one elastic lip made of a flat strip which projects beyond a front edge of the outlet opening of the slot nozzle.
  • the essence of the invention is that conventionally rigid wide slot nozzles are additionally equipped with resilient lips made of elastic bands that spring away when the moving support or substrate approaches the lips and can be easily replaced when errors occur.
  • the resilient or elastic lips are placed on the rigidly arranged upper and lower lips of wide slot nozzles.
  • the geometry is variable. They can be made of plastics (polyester, polyimide, polyolefin, perfluorinated alkane, etc.), metals (steel, brass, nickel, aluminum, copper, etc.) or rubber (fluorine-containing elastomers, such as Kalrez (R) or Zalak (R) from Dupont de Nemours).
  • films or semi-finished products of different thicknesses can be used, for example polyester films with a thickness of 50 to 400 ⁇ m.
  • the foils can be cut from sheet-like flat materials at right angles or at other angles, so that different geometries of the lips to the substrate can be set.
  • the elastic lip 3 is then clamped between the inclined outside of the upper lip 6 and the terminal block 8, but without the terminal block 8 having to be screwed to the upper lip 6.
  • the clamping screw 14 and the locking pin 20 then each pass through corresponding holes in the elastic lip 3, the clamping screw 14, however, being arranged outside the clamping strip 8. It goes without saying and requires no further explanation that a clamping screw 14 and a locking pin 20 are provided near the narrow sides of the elastic lip 3, so that it is stretched over its length without folds by the clamping screws and the locking pins.
  • a further clamping screw 14 is provided instead of the locking pin 20 of the embodiment according to FIG. 1, which then, like the first one Clamping screw 14 which passes through the clamping strip 8 and is countersunk in it.
  • the clamping strip 8 extends beyond the elastic lip, the further clamping screw 14 not passing through the elastic lip 3 but being arranged outside of it.
  • both embodiments can also be equipped with a corresponding lower elastic lip, which has the same configuration as the upper elastic lip 3 and in the same manner and way is attached.
  • the upper and the lower elastic lip are then each arranged symmetrically to the nozzle slot on the outer sides of the upper and lower lip of the coating device 1.
  • the nozzle slot is to be understood as the gap between the upper lip 6 and the lower lip 7.
  • the fastening and index holes are punched to size in the resilient band from which the elastic lips 3 and 4 are made.
  • the holes are used for the exact fixation of the lips and secure the desired position accurately.
  • the lips are fastened after they have been slid onto the dowel pins and then put on a terminal strip using the clamping screws, another suitable clamping device or magnetic.
  • the alignment of the elastic lips 3, 4 with respect to the front edge of the rigid upper and / or lower lip of the nozzle can be achieved or changed in that the clamping strips, which are provided with a stop for the elastic lip, are adjusted in different positions by means of adjusting screws can be, as will be explained with reference to FIG. 3.
  • Each of the terminal strips 8 and 9 in the embodiment according to FIG. 3 is equipped with a stop 21 or 22 for the elastic lip 3 or 4.
  • the upper lip 6 and the lower lip 7 of the slot nozzle 2 and the coating device 1 are designed so that set screws 23, 24 run parallel to the outer sides of the coating device 1 and each abut against a narrow side of the relevant terminal block 8 or 9.
  • the terminal strips on the outer sides of the coating device 1 can be moved and positioned.
  • the two elastic lips 3 and 4 project equally over the outlet opening 5 of the slot nozzle 2 and over the front edges 17 and 18 of the upper lip 6 and the lower lip 7, respectively.
  • the elastic lips 3 and 4 have dimensionally accurate holes 10 and 11, and are pushed onto dowel pins 12, 13 on the outer sides of the coating device 1.
  • the terminal strips 8 and 9 there are precise holes for the holes 10 and 11 of the elastic lips, and as soon as the elastic Lips are pushed onto the dowel pins 12 and 13, the terminal strips 8 and 9 are also pushed onto the dowel pins and screwed to the dowel pins, which have internal threads, by means of clamping screws 14 and 15.
  • the clamping device can also be designed in such a way that the clamping strips 8 and 9 consist of a magnetic material and, by magnetic attraction to the outside of the upper and lower lip 6 and 7, the elastic lips 3 and 4 lying between the outside and the clamping strips hold tight.
  • Such magnetic terminal strips can be used not only in the embodiments according to FIGS. 1 to 3, but also in all embodiments according to FIGS. 4 to 11.
  • a stepped geometry is preferred, for example, in which the lip 3, which is viewed further in the direction of web travel, is 25 to 250 ⁇ m further back further downgraded from a film carrier 25 than the front lip 4 viewed in the direction of web travel. Due to the resulting lower friction pressure under the rear lip 3, higher coating speeds without negative pressure or lower wet film thicknesses with a comparable negative pressure are possible than if both lips are equidistant from the film carrier 25 , which is guided over an application roller 19 (see. Fig. 5).
  • this stepped configuration ensures that when the carrier 25 approaches the coating nozzle, the first lip 4 seen in the direction of web travel can elastically deflect towards the slot nozzle 2 and the second lip 3, which is further back, is not contacted at all.
  • Theoretical calculations and experimental results require a distance that is in the range of one to two times the wet film thickness for a speed-independent driving style - without auxiliary procedures. In order to apply wet film thicknesses of approximately 30 ⁇ m, distances of 30 to 60 ⁇ m, for example, are required.
  • the interchangeable lips can be adjusted with respect to their angle of inclination to the nozzle gap either by changing the inclination of the outer sides of the coating device 1 or by placing wedge-shaped spacers under the elastic lip. Angles from 20 to 70 ° have proven effective. However, an arrangement with a second lip 3 (inclination 0 °) parallel to the nozzle gap also shows very good coating results. In this case, the second lip 3 also serves as a second nozzle jaw. In this case, the nozzle gap width is determined by narrow web-shaped spacers (not shown) between the rigid front jaw and the elastic rear jaw (cf. FIG. 6).
  • the inclination of the lip edges to the application roller or the film carrier can be influenced.
  • the lips are cut at right angles from a flat film.
  • Suitable cutting devices can also be used to set cutting angles other than 90 ° in order to improve the geometry with regard to the optimum coatability.
  • a lip geometry which is particularly favorable for coating processes and has a tangential inclination of the two lips or one of the two lips with respect to the application roller can be achieved in a simple manner by fixing the lips to the coating nozzle and slowly moving the latter to the rotating application roller. If the application roller was previously wrapped with emery cloth or liquid abrasive particles in the form of lapping pastes can be used, an exact tangential lip geometry. Instead of equipping the application roller with emery cloth accordingly, a suitable substrate, such as, for example, a matt, rough foil, a roughened metal strip or a carrier coated with abrasive particles, can be used for the grinding.
  • the exact lip geometry can also be ground in using a suitable substrate.
  • the slot nozzle 2 is only equipped with a single elastic lip 4 on the outside of the lower lip 7 of the slot nozzle 2, while the outside of the upper lip 6 does not have a lip.
  • the reverse can also be the case, namely that the upper lip 6 has a resilient or elastic lip, while the lower lip 7 remains lipless.
  • the lip which is the smallest distance from the film carrier to be coated is preferred in each case.
  • the other lip is then rigid, as in conventional coating nozzles, and to a certain extent includes the elastic spring or wear lip, ie in other words, it has the same outline as the other rigid one Lip of the slot die including the elastic spring or wear lip attached to it.
  • FIGS. 9 and 10 show two embodiments in which the elastic lips 3 and 4 are ground radially or flat, corresponding to the curvature of the application roller or contact surface 19, as has already been explained above.
  • a gap 27 between the elastic lips 3 and 4 is narrower than the nozzle gap or the opening cross section of the slot nozzle 2 between the rigid upper and lower lip 6 and 7 of the slot nozzle 2.
  • the chamfer width of the lips can be varied by changing the film thickness, e.g. in the range of 50 to 400 ⁇ m, in which the film materials have spring action.
  • the spring effect can be significantly increased for particularly wide chamfers by superimposing two or more foils.

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  • Coating Apparatus (AREA)
EP94101160A 1993-02-05 1994-01-27 Dispositif d'enduction pour l'application d'une couche humide mince Expired - Lifetime EP0609768B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4303357 1993-02-05
DE4303357A DE4303357A1 (de) 1993-02-05 1993-02-05 Beschichtungsvorrichtung zum Auftragen dünner Naßfilme

Publications (2)

Publication Number Publication Date
EP0609768A1 true EP0609768A1 (fr) 1994-08-10
EP0609768B1 EP0609768B1 (fr) 1998-11-25

Family

ID=6479737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94101160A Expired - Lifetime EP0609768B1 (fr) 1993-02-05 1994-01-27 Dispositif d'enduction pour l'application d'une couche humide mince

Country Status (4)

Country Link
US (1) US5656086A (fr)
EP (1) EP0609768B1 (fr)
JP (1) JPH06292853A (fr)
DE (2) DE4303357A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995029764A1 (fr) * 1994-04-29 1995-11-09 Minnesota Mining And Manufacturing Company Procede et appareil d'enduction a filiere
EP0672462A3 (fr) * 1994-03-16 1995-12-06 Nordson Corp Applicateur de substances fluides.
WO1996011069A1 (fr) * 1994-10-06 1996-04-18 Minnesota Mining And Manufacturing Company Procede d'enduction a la racle a montee de liquide par tension
US5639305A (en) * 1994-04-29 1997-06-17 Minnesota Mining And Manufacturing Company Die coating method and apparatus
US5759274A (en) * 1994-04-29 1998-06-02 Minnesota Mining And Manufacturing Company Die coating apparatus with surface covering
EP0985456A3 (fr) * 1998-09-09 2000-05-03 Eastman Kodak Company Dispositif d'enduction à lèvre remplaçable
CN102905797A (zh) * 2010-03-26 2013-01-30 沃依特专利有限责任公司 用于将介质涂覆到移动的纤维料幅两侧上的设备和方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007106390A2 (fr) 2006-03-10 2007-09-20 Amesbury Group, Inc Systemes et procedes de fabrication de profiles d'etancheite renforces
JP5149660B2 (ja) * 2008-03-17 2013-02-20 富士フイルム株式会社 エクストルージョン塗布装置及び塗膜付きウエブの製造方法
JP5558706B2 (ja) * 2008-12-26 2014-07-23 ノードソン コーポレーション スロットノズルの研磨方法
US10537913B2 (en) * 2013-04-29 2020-01-21 Hewlett-Packard Development Company, L.P. Selective slot coating
US10329834B2 (en) 2015-02-13 2019-06-25 Amesbury Group, Inc. Low compression-force TPE weatherseals
DE102015121449A1 (de) * 2015-12-09 2017-06-14 Ba Assembly & Turnkey Systems Gmbh Verstreicheinheit
CN115605295A (zh) * 2020-09-28 2023-01-13 株式会社Lg新能源（Kr） 多狭缝模具涂布机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622239A (en) * 1986-02-18 1986-11-11 At&T Technologies, Inc. Method and apparatus for dispensing viscous materials

Family Cites Families (9)

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US3377655A (en) * 1966-03-02 1968-04-16 Eastman Kodak Co Extrusion die
US4029460A (en) * 1975-07-29 1977-06-14 Fmc Corporation Flat film extrusion nozzle
GB1604620A (en) * 1977-11-10 1981-12-09 Britton A Application of liquid material to webs
US4143187A (en) * 1977-12-01 1979-03-06 Du Pont Of Canada Limited Process for coating sheet substrates with thermoplastic polymer
JPS59216997A (ja) * 1983-05-25 1984-12-07 神崎製紙株式会社 塗被紙の製造方法
US4720402A (en) * 1987-01-30 1988-01-19 American Telephone And Telegraph Company Method for dispensing viscous material
DE3721593A1 (de) * 1987-06-30 1989-01-26 Henning J Claassen Vorrichtung zum auftragen von fluessigen klebstoffen auf ein substrat
JP2565414B2 (ja) * 1990-04-16 1996-12-18 富士写真フイルム株式会社 塗布装置
JPH04123317A (ja) * 1990-04-27 1992-04-23 Hitachi Maxell Ltd 塗布液の塗布方法および塗布装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4622239A (en) * 1986-02-18 1986-11-11 At&T Technologies, Inc. Method and apparatus for dispensing viscous materials

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0672462A3 (fr) * 1994-03-16 1995-12-06 Nordson Corp Applicateur de substances fluides.
US5636790A (en) * 1994-03-16 1997-06-10 Nordson Corporation Fluid applicator
WO1995029764A1 (fr) * 1994-04-29 1995-11-09 Minnesota Mining And Manufacturing Company Procede et appareil d'enduction a filiere
US5639305A (en) * 1994-04-29 1997-06-17 Minnesota Mining And Manufacturing Company Die coating method and apparatus
US5759274A (en) * 1994-04-29 1998-06-02 Minnesota Mining And Manufacturing Company Die coating apparatus with surface covering
WO1996011069A1 (fr) * 1994-10-06 1996-04-18 Minnesota Mining And Manufacturing Company Procede d'enduction a la racle a montee de liquide par tension
US5612092A (en) * 1994-10-06 1997-03-18 Minnesota Mining And Manufacturing Company Knife coating method using ascension of the fluid by its tension
CN1090541C (zh) * 1994-10-06 2002-09-11 美国3M公司 张力上升刮板涂敷方法
EP0985456A3 (fr) * 1998-09-09 2000-05-03 Eastman Kodak Company Dispositif d'enduction à lèvre remplaçable
CN102905797A (zh) * 2010-03-26 2013-01-30 沃依特专利有限责任公司 用于将介质涂覆到移动的纤维料幅两侧上的设备和方法
CN102905797B (zh) * 2010-03-26 2016-11-23 沃依特专利有限责任公司 用于将介质涂覆到移动的纤维料幅两侧上的涂覆设备和方法

Also Published As

Publication number Publication date
EP0609768B1 (fr) 1998-11-25
US5656086A (en) 1997-08-12
DE4303357A1 (de) 1994-08-11
DE59407321D1 (de) 1999-01-07
JPH06292853A (ja) 1994-10-21

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