WO1995029764A1 - Die coating method and apparatus - Google Patents
Die coating method and apparatus Download PDFInfo
- Publication number
- WO1995029764A1 WO1995029764A1 PCT/US1995/003312 US9503312W WO9529764A1 WO 1995029764 A1 WO1995029764 A1 WO 1995029764A1 US 9503312 W US9503312 W US 9503312W WO 9529764 A1 WO9529764 A1 WO 9529764A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coating
- die
- downstream
- lip
- land
- Prior art date
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
- B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
- B05C3/18—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material only one side of the work coming into contact with the liquid or other fluent material
-
- 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
-
- 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
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
Definitions
- the present invention relates to coating methods. More particularly, the present invention relates to coating methods using a die.
- U.S. Patent No. 2,681,294 discloses a vacuum method for stabilizing the coating bead for direct extrusion and slide types of metered coating systems.
- U.S. Patent No. 3,413,143 discloses a two slot die with excess coating liquid pumped into the coating bead area through the upstream slot.
- U.S. Patent No. 4,443,504 discloses a slide coating apparatus in which the angle between the slide surface and a horizontal datum plane ranges from 35° to 50° and the takeoff angle defined between a tangent to the coating roll and the slide surface ranges from 85° to 100°. Operation within these ranges provides a compromise between performance from high fluid momentum down the slide and coating uniformity from high liquid leveling force against the slide surface.
- the width of the lips 30, 32 commonly range from 0.25 to 0.76 mm.
- the vacuum chamber 12 applies a vacuum upstream of the bead to stabilize the bead. While this configuration works adequately in many situations, there is a need for a die coating method which improves the performance of known methods.
- the slot height, the overbite, and the convergence can improve coating performance.
- the slot height, the overbite, and the convergence are selected in combination with each other and the length of the land, the edge angle of the downstream bar, the die attack angle between the downstream bar surface of the coating slot and a tangent plane through a line on the surface to be coated parallel to, and directly opposite, the sharp edge, and the coating gap distance between the sharp edge and the surface to be coated are selected in combination with each other.
- the shape of the land conforms to the shape of the surface being coated. Where the surface is curved, the land is curved.
- the die also can include applying a vacuum upstream of the bead to stabilize the bead.
- the vacuum can be applied using a vacuum chamber having a vacuum bar with a land.
- the shape of the vacuum land also conforms to the shape of the surface being coated.
- the land and the vacuum land can have the same radius of curvature and can have the same or different convergences with respect to the surface to be coated.
- a replaceable, flexible strip can be clamped between two downstream bars above the coating slot to facilitate replacement of a damaged overbite edge.
- the strip can be held in position by vacuum applied through the downstream bar.
- a low surface energy covering can be applied to the surface of the downstream bar adjacent to the sharp edge, and to the surface of the land, adjacent to its downstream edge. This presents a generally undulating surface. The low surface energy coverings need not extend completely to the edges of the downstream bar and the land.
- the method can also include the step of applying a vacuum upstream of the bead to stabilize the bead.
- the die can have an upstream bar with an upstream lip, a middle bar with a middle lip, and a downstream bar with a downstream lip.
- the upstream lip is formed as a land
- the middle lip is formed as a sharp edge
- the downstream lip is formed as a sharp edge.
- a first passageway runs through the die between the upstream and middle bars.
- the passageway has a first slot defined by the upstream and middle lips, and coating fluid exits the die from the first slot to form a continuous coating bead between the upstream die lip, the middle die lip, and the surface being coated.
- Figure 1 is a schematic, cross-sectional view of a known coating die.
- Figure 2 is an enlarged cross-sectional view of the slot and lip of the die of Figure 1.
- Figure 3 is a cross-sectional view of an extrusion die of the present invention.
- Figure 4 is an enlarged cross-sectional view of the slot and lip of the-die of Figure 3.
- Figure 5 is a cross-sectional view of the slot and lip similar to that of Figure 4.
- Figure 6 is a cross-sectional view of an alternative vacuum chamber arrangement.
- Figure 11 shows coating test results which compare the performance of a known extrusion die and an extrusion die of the present invention for a coating liquid of 1.8 centipoise viscosity.
- Figure 12 shows comparative test results for a coating liquid of 2.7 centipoise viscosity.
- Figure 14 is a graph of constant G/Tw lines for an extrusion coating die of the present invention for nine different coating liquids.
- the sharp edge 70 should be clean and free of nicks and burrs, and should be straight within 1 micron in 25 cm of length.
- the edge radius should be no greater than 10 microns.
- the edge can be formed of an acute angle, as shown or as a right or obtuse angle, with or without a bevel. Alternatively, the edge can be formed with a "drop nose", on an extension of the downstream lip 62 that narrows the slot 56. Regardless of the edge configuration, proper overbite is required to maintain performance.
- the radius of the curved land 68 should be equal to the radius of the backup roller 50 plus a minimal, and non-critical, 0.13 mm allowance for coating gap and web thickness.
- Figure 5 also shows dimensions of geometric operating parameters for single layer extrusion.
- the length Li of the curved land 68 on the upstream bar 64 can range from 1.6 mm to 25.4 mm.
- the preferred length Li is 12.7 mm.
- the edge angle hi of the downstream bar 66 can range from 10° to 75°, and is preferably 60°.
- the edge radius of the sharp edge 70 should be from about 2 microns to about 4 microns and preferably less than 10 microns.
- the die attack angle A 2 between the downstream bar 66 surface of the coating slot 56 and the tangent plane P through a line on the web 48 surface parallel to, and directly opposite, the sharp edge 70 can range from 30° to 150° and is preferably 90°-95°, such as 93°.
- the coating gap Gi is the perpendicular distance between the sharp edge 70 and the web 48. (The coating gap Gi is measured at the sharp edge but is shown in some Figures spaced from the sharp edge for drawing clarity. Regardless of the location of Gi in the drawings - and due to the curvature of the web the gap increases as one moves away from the sharp edge - the gap is measured at the sharp edge.)
- Air leakage at the ends of the die into the vacuum chamber 42 is minimized by end plates 90 attached to the ends of the vacuum bar 74 which overlap the ends of the upstream bar 64.
- the vacuum bar 74 is 0.10 mm to 0.15 mm longer than the upstream bar 64, so, in a centered condition, the clearance between each end plate 90 and the upstream bar 64 will range from 0.050 mm to 0.075 mm.
- Figure 11 graphs results of coating tests which compare the performance of a known extrusion die with an extrusion die of this invention.
- the 1.8 centipoise coating liquid containing an organic solvent was applied to a plain polyester film web.
- the performance criterion was minimum wet layer thickness at four different coating gap levels for each of the two coating systems, over the speed range of 15 to 60 m/min.
- Curves A, B, C, and D use the known, prior art die and were performed with coating gaps of 0.254 mm, 0.203 mm, 0.152 mm, and 0.127 mm, respectively.
- Curves E, F, G, and H use a die according to this invention at the same respective coating gaps.
- a similar low surface energy inlay can be produced in the downstream bar 66 surface, starting 0.127 mm - 0.762 mm above the sharp edge 70. With precisely - ground strips 264 adjacent the edges 70 and 72, precise adjustment of overbite is facilitated and the low surface energy layer is protected from damage and delamination.
- Figures 19 and 20 show a system of the present invention for die coating where excess coating liquid is continuously metered into the coating bead from a die 270, and some of the coating liquid is subtractively metered out, such that a specified amount is coated onto the moving web.
- Coating liquid 14 is supplied to the die 270 by a pump 272, and returned to a sump 274 by a second pump 276.
- the die 270 using a stabilizing vacuum chamber 278, coats the precisely metered amount of coating liquid onto the web 48 moving over a backup roller 280.
- the die parameters were set as follows.
- the supply slot 292 height was 0.15 mm, and its overbite (middle edge 300 compared with the downstream edge 72 of the curved land) was 0.0 mm.
- the exit slot 294 was 0.076 mm, and its overbite (downstream edge 70 compared with the middle edge 300) was 0.076 mm.
- the cross-web width of the exit slot 294 was 3.2 mm less than the width of the supply slot 292 to eliminate air entrainment in the bead.
- the attack angle A 2 between the supply slot 292 and the tangent plane P can range from 90° to 135°
- the attack angle A 5 between the exit slot 294 and the tangent plane P can range from 60° to 115°.
- the vacuum bar can be mounted and adjusted separately from the upstream bar 282.
Landscapes
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BR9507567A BR9507567A (en) | 1994-04-29 | 1995-03-16 | Matrix coating device and process |
MX9605132A MX9605132A (en) | 1994-04-29 | 1995-03-16 | Die coating method and apparatus. |
KR1019960706091A KR100329583B1 (en) | 1994-04-29 | 1995-03-16 | Die coating method and device |
DE69511856T DE69511856T2 (en) | 1994-04-29 | 1995-03-16 | NOZZLE COATING METHOD AND DEVICE |
JP52820895A JP3766097B2 (en) | 1994-04-29 | 1995-03-16 | Roll and die coating method and apparatus |
EP95914074A EP0757597B1 (en) | 1994-04-29 | 1995-03-16 | Die coating method and apparatus |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US23655194A | 1994-04-29 | 1994-04-29 | |
US08/236551 | 1994-04-29 | ||
US08/236,570 | 1994-04-29 | ||
US08/236,570 US5759274A (en) | 1994-04-29 | 1994-04-29 | Die coating apparatus with surface covering |
US08/236,635 US5639305A (en) | 1994-04-29 | 1994-04-29 | Die coating method and apparatus |
US08/236,635 | 1994-04-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995029764A1 true WO1995029764A1 (en) | 1995-11-09 |
Family
ID=27398873
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1995/003312 WO1995029764A1 (en) | 1994-04-29 | 1995-03-16 | Die coating method and apparatus |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0757597B1 (en) |
JP (1) | JP3766097B2 (en) |
KR (1) | KR100329583B1 (en) |
CN (1) | CN1067299C (en) |
BR (1) | BR9507567A (en) |
CA (1) | CA2187895A1 (en) |
DE (1) | DE69511856T2 (en) |
MX (1) | MX9605132A (en) |
WO (1) | WO1995029764A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6168682B1 (en) | 1998-02-10 | 2001-01-02 | 3M Innovative Properties Company | Method of manufacturing an optical recording medium |
US6720025B2 (en) | 2002-07-01 | 2004-04-13 | 3M Innovative Properties Company | Slot extrusion coating methods |
US6813820B2 (en) | 2001-12-19 | 2004-11-09 | 3M Innovative Properties Company | Method of improving coating uniformity |
US7033644B2 (en) | 2002-01-09 | 2006-04-25 | Fuji Photo Film Co., Ltd. | Apparatus and method for applying coating solution, die and method for assembling thereof |
US7097673B2 (en) | 2001-06-07 | 2006-08-29 | 3M Innovative Properties Company | Coating edge control |
US7819077B2 (en) | 2003-09-17 | 2010-10-26 | 3M Innovative Properties Company | Die coaters |
US7867567B2 (en) | 2004-09-30 | 2011-01-11 | Fujifilm Corporation | Coating method of coating solution |
US8178166B2 (en) | 2002-01-09 | 2012-05-15 | Fujifilm Corporation | Apparatus and method for applying coating solution, die and method for assembling thereof |
US8771793B2 (en) | 2011-04-15 | 2014-07-08 | Roche Diagnostics Operations, Inc. | Vacuum assisted slot die coating techniques |
CN111468371A (en) * | 2020-03-31 | 2020-07-31 | 中国建筑材料科学研究总院有限公司 | Method and device for preparing protective film |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4382620B2 (en) * | 2004-09-27 | 2009-12-16 | 富士フイルム株式会社 | Optical compensation sheet, elliptically polarizing plate, and liquid crystal display device |
EP1875281A1 (en) | 2005-03-10 | 2008-01-09 | FUJIFILM Corporation | Optical compensation film, polarizing plate and liquid crystal display |
JP6904770B2 (en) * | 2017-04-25 | 2021-07-21 | 株式会社ヒラノテクシード | Web cooling system |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413143A (en) * | 1963-12-10 | 1968-11-26 | Ilford Ltd | High speed coating apparatus |
FR2375914A1 (en) * | 1977-01-03 | 1978-07-28 | Inventing Ab | METHOD AND APPARATUS FOR TREATING OR APPLYING COATINGS TO SURFACES, FOR EXAMPLE, CONTINUOUS SHEETS OF MOVING MATTER |
GB2120132A (en) * | 1982-05-19 | 1983-11-30 | Konishiroku Photo Ind | Extrusion coating apparatus |
EP0196029A2 (en) * | 1985-03-22 | 1986-10-01 | Union Carbide Corporation | Vacuum guide used in flexible sheet material treatment |
DE3723149A1 (en) * | 1986-07-15 | 1988-01-21 | Fuji Photo Film Co Ltd | DEVICE FOR APPLYING A LIQUID TO A CARRIER |
DE9112589U1 (en) * | 1991-10-10 | 1991-12-12 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
EP0466420A2 (en) * | 1990-07-10 | 1992-01-15 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Fountain coater |
EP0484738A1 (en) * | 1990-11-05 | 1992-05-13 | Pagendarm GmbH | Applicator |
EP0552653A1 (en) * | 1992-01-21 | 1993-07-28 | E.I. Du Pont De Nemours And Company | Lip surface geometry for slide bead coating |
EP0609768A1 (en) * | 1993-02-05 | 1994-08-10 | Hoechst Aktiengesellschaft | Coating device for applying a thin wet film |
-
1995
- 1995-03-16 KR KR1019960706091A patent/KR100329583B1/en not_active IP Right Cessation
- 1995-03-16 JP JP52820895A patent/JP3766097B2/en not_active Expired - Fee Related
- 1995-03-16 EP EP95914074A patent/EP0757597B1/en not_active Expired - Lifetime
- 1995-03-16 WO PCT/US1995/003312 patent/WO1995029764A1/en active IP Right Grant
- 1995-03-16 BR BR9507567A patent/BR9507567A/en not_active IP Right Cessation
- 1995-03-16 DE DE69511856T patent/DE69511856T2/en not_active Expired - Fee Related
- 1995-03-16 CN CN95192830A patent/CN1067299C/en not_active Expired - Fee Related
- 1995-03-16 MX MX9605132A patent/MX9605132A/en not_active Application Discontinuation
- 1995-03-16 CA CA002187895A patent/CA2187895A1/en not_active Abandoned
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3413143A (en) * | 1963-12-10 | 1968-11-26 | Ilford Ltd | High speed coating apparatus |
FR2375914A1 (en) * | 1977-01-03 | 1978-07-28 | Inventing Ab | METHOD AND APPARATUS FOR TREATING OR APPLYING COATINGS TO SURFACES, FOR EXAMPLE, CONTINUOUS SHEETS OF MOVING MATTER |
GB2120132A (en) * | 1982-05-19 | 1983-11-30 | Konishiroku Photo Ind | Extrusion coating apparatus |
EP0196029A2 (en) * | 1985-03-22 | 1986-10-01 | Union Carbide Corporation | Vacuum guide used in flexible sheet material treatment |
DE3723149A1 (en) * | 1986-07-15 | 1988-01-21 | Fuji Photo Film Co Ltd | DEVICE FOR APPLYING A LIQUID TO A CARRIER |
EP0466420A2 (en) * | 1990-07-10 | 1992-01-15 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Fountain coater |
EP0484738A1 (en) * | 1990-11-05 | 1992-05-13 | Pagendarm GmbH | Applicator |
DE9112589U1 (en) * | 1991-10-10 | 1991-12-12 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
EP0552653A1 (en) * | 1992-01-21 | 1993-07-28 | E.I. Du Pont De Nemours And Company | Lip surface geometry for slide bead coating |
EP0609768A1 (en) * | 1993-02-05 | 1994-08-10 | Hoechst Aktiengesellschaft | Coating device for applying a thin wet film |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6168682B1 (en) | 1998-02-10 | 2001-01-02 | 3M Innovative Properties Company | Method of manufacturing an optical recording medium |
US7097673B2 (en) | 2001-06-07 | 2006-08-29 | 3M Innovative Properties Company | Coating edge control |
US6813820B2 (en) | 2001-12-19 | 2004-11-09 | 3M Innovative Properties Company | Method of improving coating uniformity |
US7615175B2 (en) | 2001-12-19 | 2009-11-10 | 3M Innovative Properties Company | Method of improving coating uniformity |
US7033644B2 (en) | 2002-01-09 | 2006-04-25 | Fuji Photo Film Co., Ltd. | Apparatus and method for applying coating solution, die and method for assembling thereof |
US8178166B2 (en) | 2002-01-09 | 2012-05-15 | Fujifilm Corporation | Apparatus and method for applying coating solution, die and method for assembling thereof |
US6720025B2 (en) | 2002-07-01 | 2004-04-13 | 3M Innovative Properties Company | Slot extrusion coating methods |
US7819077B2 (en) | 2003-09-17 | 2010-10-26 | 3M Innovative Properties Company | Die coaters |
US7867567B2 (en) | 2004-09-30 | 2011-01-11 | Fujifilm Corporation | Coating method of coating solution |
US8771793B2 (en) | 2011-04-15 | 2014-07-08 | Roche Diagnostics Operations, Inc. | Vacuum assisted slot die coating techniques |
CN111468371A (en) * | 2020-03-31 | 2020-07-31 | 中国建筑材料科学研究总院有限公司 | Method and device for preparing protective film |
Also Published As
Publication number | Publication date |
---|---|
EP0757597B1 (en) | 1999-09-01 |
DE69511856D1 (en) | 1999-10-07 |
DE69511856T2 (en) | 2000-02-24 |
MX9605132A (en) | 1997-08-30 |
CA2187895A1 (en) | 1995-11-09 |
JPH09511682A (en) | 1997-11-25 |
CN1067299C (en) | 2001-06-20 |
CN1147218A (en) | 1997-04-09 |
EP0757597A1 (en) | 1997-02-12 |
KR100329583B1 (en) | 2002-08-24 |
JP3766097B2 (en) | 2006-04-12 |
BR9507567A (en) | 1997-08-05 |
KR970702759A (en) | 1997-06-10 |
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