EP0481088A1 - Verfahren und vorrichtung zum auftragen einer flüssigkeit - Google Patents

Verfahren und vorrichtung zum auftragen einer flüssigkeit Download PDF

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Publication number
EP0481088A1
EP0481088A1 EP91908184A EP91908184A EP0481088A1 EP 0481088 A1 EP0481088 A1 EP 0481088A1 EP 91908184 A EP91908184 A EP 91908184A EP 91908184 A EP91908184 A EP 91908184A EP 0481088 A1 EP0481088 A1 EP 0481088A1
Authority
EP
European Patent Office
Prior art keywords
liquid
flexible member
applying
base film
downstream side
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.)
Withdrawn
Application number
EP91908184A
Other languages
English (en)
French (fr)
Other versions
EP0481088A4 (en
Inventor
Atsuhiko Suda
Yoshikazu Kai
Naoki Kawasaki
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.)
Maxell Holdings Ltd
Original Assignee
Hitachi Maxell Ltd
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 Hitachi Maxell Ltd filed Critical Hitachi Maxell Ltd
Publication of EP0481088A1 publication Critical patent/EP0481088A1/de
Publication of EP0481088A4 publication Critical patent/EP0481088A4/en
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/028—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with a body having a large flat spreading or distributing surface
    • 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 a method for applying liquid with extrusion type applying head and an apparatus therefor and more particularly to the method for applying the liquid to a base film in a uniform thickness and without forming stripes on the surface of the applied liquid in a wide range of liquid applying condition.
  • Indirect applying methods such as gravure method, reverse roll method, and kiss coating method are widely used as a method for applying, to a base film which is moving, a water solution, resin liquid or liquids consisting of various kinds of powders dispersedly mixed with each other in a dispersing medium such as water or an organic solvent.
  • the thickness of the applied liquid is ununiform as a result of the repeated use of the applying head.
  • the quality of the film degrades.
  • liquid containing abrasive particles, for example, magnetic liquid is used, the outlet of the applying head on the downstream side thereof is worn to a great extent. As such, it is difficult to maintain the quality of the film consisting of the liquid.
  • the present invention has been made as a result of researches. That is, in applying liquid to a moving base film with an extrusion type applying head, a flexible member is extended outward from a downstream side end of an outlet of a liquid discharge slit of the extrusion type applying head; and the flexible member is brought into contact with the surface of the moving base film; and the liquid discharged from the liquid flow slit is applied to the base film in a wide range of liquid applying condition with the liquid being smoothed by the flexible member so that the liquid is applied to the base film without forming nonuniformity in the thickness of the applied layer and stripes on the surface thereof.
  • Fig. 1 shows the leading end portion of an extrusion type applying head to be used in the present invention.
  • a liquid discharge slit 4 is provided between the downstream side end 2 of the applying head 1 and the upstream side end thereof.
  • a flexible member 5 is mounted in the slit 4 of the applying head 1 on the side of the downstream side end 2 thereof and extended outward from the downstream side end of the outlet 41 of the slit 4.
  • Fig. 2 shows a process of applying the liquid to a base film by discharging it from the slit 4 of the applying head 1.
  • An extended portion 51 of the flexible member 5 extended outward from the downstream side end of the outlet 41 of the slit 4 is bent toward the film moving direction at the downstream side end 2 so as to bring the extended portion 51 into contact with a base film 6 which moves continuously.
  • the liquid 7 discharged from the slit 4 is applied to the base film 6 with the extended portion 51 of the flexible member 5 smoothing the liquid 7.
  • the liquid 7 discharged from the slit 4 is smoothed by the extended portion 51 of the flexible member 5 and applied to the base film 6 without nonuniformity occurring in the thickness of the applied liquid 7 or stripe-like marks formed. Notwithstanding the change of the liquid application condition such as a viscosity, an application speed, and an application amount, the liquid is smoothed by the extended portion 51 of the flexible member 5.
  • the liquid 7 is preferably applied to the base film 6 in a wide range of application condition. Further, since the downstream side end of the outlet 41 of the slit 4 does not act as a doctor edge, the downstream side end of the outlet 41 is not worn and as such the configuration thereof is not changed. Even though the liquid 7 contains abrasive particles such as magnetic powders, the liquid 7 can be repeatedly applied to the base film 6 in the same condition and the quality of the film of the liquid 7 does not degrade.
  • the flexible member 5 extending in the width of 500mm outward from the downstream side end of the outlet 41 of the slit 4 is likely to be crimped and becomes ununiform widthwise in a long cycle in the thickness of the applied liquid 7 while the liquid 7 is being applied if the flexural rigidity E ⁇ I (E: modulus of longitudinal elasticity, I: modulus of section) of the flexible member 5 is smaller than 0.01kg ⁇ mm2. Therefore, preferably, the flexural rigidity of the flexible member 5 is greater than 0.01kg ⁇ mm2. However, if the flexural rigidity of the flexible member 5 is greater than 15kg ⁇ mm2, the flexible member 5 is incapable of smoothing the liquid 7 favorably and displays doctor effect beyond the necessary degree, thus scraping the applied liquid 7.
  • E ⁇ I E: modulus of longitudinal elasticity
  • I modulus of section
  • the flexural rigidity of the flexible member 5 is in the range from 0.01kg ⁇ mm2 to 15kg ⁇ mm2 and more favorably, from 0.1kg ⁇ mm2 to 10kg ⁇ mm2. If the length of the extended portion 51 extended outward from the downstream side end of the outlet 41 of the slit 4 is shorter than 3mm, a desired effect cannot be obtained and if longer than 30mm, the surface of the film consisting of the applied liquid 7 is rough. Therefore, it is preferable that the length of the extended portion 51 extended outward from the downstream side end of the outlet 41 of the slit 4 is in the range from 3mm to 30mm.
  • film-shaped flexible materials 5 are used.
  • polyester films such as polyethylene terephthalate, polyethylene 2,6-naphthalate; polyolephin films such as polyethylene, polyolephin; plastic films such as derivatives of cellulose, polycarbonate, polyimide, and polyamideimide; and foils of aluminum or some alloys.
  • the flexible member 5 Since the flexible member 5 is mounted on the downstream side end 2 of the outlet 41 of the slit 4 and extended outward therefrom, the pressure of the liquid 7, the flexural rigidity of the flexible material 5, and the pressing force of the applying head 1 against the base film 6 favorably balance with the rigidity and tension of the base film 6 during the movement of the base film 6. Consequently, the liquid 7 is smoothed favorably and applied uniformly to the base film 6 without ununiform thickness or stripe-like marks formed.
  • Co-coated ⁇ -Fe2O3 (major axial diameter: 0.4 ⁇ m, minor axial diameter: 0.05 ⁇ m, coercive force: 600 oersteds) 500 parts by weight nitrocellulose 50 parts by weight Pandex T - 5250 ® (manufactured by Nippon Ink Chemical Industry Co., Ltd., polyurethane resin) 30 parts by weight Coronate L ® (manufactured by Nippon Polyurethane Industry Co., Ltd., trifunctional isocyanate compound of low molecular weight) 20 parts by weight Morgal L ® (manufactured by Cabot Corp., carbon black) 10 parts by weight myristic acid 3 parts by weight butyl stearate 2 parts by weight methyl isobutyl ketone 720 parts by weight toluene 720 parts by weight
  • a compound consisting of the above substances were dispersedly mixed with each other by a ball mill for 72 hours to prepare magnetic paint having a viscosity of 0.18p at a temperature of 25°C and a shear rate of 104S ⁇ 1.
  • the flexible member 5 made of polyethylene terephthalate and having a thickness of 36 ⁇ m and a width of 520mm was mounted on the downstream side end of the slit 4 of a SUS 304 extrusion type applying head 1.
  • the magnetic paint was supplied to the applying head 1.
  • the flexural rigidity of the flexible member 5 is 1.2kg ⁇ mm2 when the length and width of the extended portion 51 of the flexible member 5 are 20mm and 500mm, respectively.
  • the magnetic paint was applied to the moving polyester film 6 of 15 ⁇ m thick and 508mm wide at an application speed of 150m/min and in an application width of 480mm, then, the applied paint was dried to form a magnetic layer on the polyester film 6 having an amount of 28cc/m2 of paint and a thickness of 4.0 ⁇ m.
  • magnetic paint having a viscosity of 0.30p at a temperature of 25°C and a shear rate of 104S ⁇ 1 was prepared to form a magnetic layer having an amount of 22cc/m2 of paint and a thickness of 4.0 ⁇ m similarly to the embodiment 1.
  • magnetic paint having a viscosity of 0.64p at a temperature of 25°C and a shear rate of 104S ⁇ 1 was prepared to form a magnetic layer having an amount of 20cc/m2 of paint and a thickness of 4.0 ⁇ m similarly to the embodiment 1.
  • the magnetic paint was applied to the base film 6 to form a magnetic layer having an amount of 28cc/m2 of paint and a thickness of 4.0 ⁇ m.
  • the thickness and width of the flexible member 5 used in this embodiment were 36 ⁇ m and 520mm, respectively and made of polyethylene terephthalate, however, the flexural rigidity thereof was 3.3kg ⁇ mm2 when the thickness and width of the extended portion 51 thereof were 36 ⁇ m and 520mm, respectively.
  • the flexible member 5 was mounted on the downstream side end of the slit 4 of the SUS 304 extrusion type applying head 1.
  • the magnetic paint was applied to the base film 6 to form a magnetic layer having an amount of 22cc/m2 of paint and a thickness of 4.0 ⁇ m.
  • the flexible member 5 made of polyethylene terephthalate was used.
  • the flexural rigidity of the flexible member 5 used in this embodiment was 3.3kg ⁇ mm2 when the thickness and width thereof was 36 ⁇ m and 520mm, respectively and the length and width of the extended portion 51 were 20mm and 500mm, respectively.
  • the flexible member 5 was mounted on the downstream side end of the slit 4 of the SUS 304 extrusion type applying head 1.
  • the magnetic paint was applied to the base film 6 to form a magnetic layer having an amount of 20cc/m2 of paint and a thickness of 4.0 ⁇ m.
  • the flexible member 5 made of polyethylene terephthalate was used.
  • the flexural rigidity of the flexible member 5 used in this embodiment was 3.3kg ⁇ mm2 when the thickness and width thereof was 36 ⁇ m and 520mm, respectively and the length and width of the extended portion 51 were 20mm and 500mm, respectively.
  • the flexible member 5 was mounted on the downstream side end of the slit 4 of the SUS 304 extrusion type applying head 1.
  • each magnetic layer (embodiment 1 through embodiment 6) has a more favorable appearance and condition and a smaller degree of thickness nonuniformity than the magnetic layers (comparisons 2 and 3) formed by the conventional method.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
EP19910908184 1990-04-27 1991-04-26 Method and device for applying liquid Withdrawn EP0481088A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP113498/90 1990-04-27
JP11349890 1990-04-27

Publications (2)

Publication Number Publication Date
EP0481088A1 true EP0481088A1 (de) 1992-04-22
EP0481088A4 EP0481088A4 (en) 1992-08-05

Family

ID=14613844

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910908184 Withdrawn EP0481088A4 (en) 1990-04-27 1991-04-26 Method and device for applying liquid

Country Status (2)

Country Link
EP (1) EP0481088A4 (de)
WO (1) WO1991016998A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674566A (en) * 1993-01-13 1997-10-07 Morgan; Russell Process and device for processing plate-like workpieces

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343259A (en) * 1980-07-11 1982-08-10 Weyerhaeuser Company Apparatus for applying adhesive in corrugated board manufacture

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5784771A (en) * 1980-11-13 1982-05-27 Fuji Photo Film Co Ltd Coater
JPS58104666A (ja) * 1981-12-16 1983-06-22 Fuji Photo Film Co Ltd 塗布装置
AT376612B (de) * 1982-10-07 1984-12-10 Johannes Zimmer Einrichtung zum gleichmaessigen bzw. regelmaessigen verteilen fliessfaehiger medien in vorgegebener breite
AT376175B (de) * 1982-10-07 1984-10-25 Johannes Zimmer Vorrichtung zum gleichmaessigen auftragen von fliessfaehigen medien

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343259A (en) * 1980-07-11 1982-08-10 Weyerhaeuser Company Apparatus for applying adhesive in corrugated board manufacture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO9116998A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5674566A (en) * 1993-01-13 1997-10-07 Morgan; Russell Process and device for processing plate-like workpieces

Also Published As

Publication number Publication date
WO1991016998A1 (en) 1991-11-14
EP0481088A4 (en) 1992-08-05

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