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EP0336367A2 - Dispositif pour enduire simultanément les côtés opposés d'un substrat - Google Patents

Dispositif pour enduire simultanément les côtés opposés d'un substrat Download PDF

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Publication number
EP0336367A2
EP0336367A2 EP89105881A EP89105881A EP0336367A2 EP 0336367 A2 EP0336367 A2 EP 0336367A2 EP 89105881 A EP89105881 A EP 89105881A EP 89105881 A EP89105881 A EP 89105881A EP 0336367 A2 EP0336367 A2 EP 0336367A2
Authority
EP
European Patent Office
Prior art keywords
coater
rolls
base material
coating equipment
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.)
Withdrawn
Application number
EP89105881A
Other languages
German (de)
English (en)
Other versions
EP0336367A3 (fr
Inventor
Masaro Kido
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.)
OKAZAKI MACHINE INDUSTRY Co Ltd
Kanegafuchi Chemical Industry Co Ltd
Original Assignee
OKAZAKI MACHINE INDUSTRY Co Ltd
Kanegafuchi Chemical Industry Co 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 OKAZAKI MACHINE INDUSTRY Co Ltd, Kanegafuchi Chemical Industry Co Ltd filed Critical OKAZAKI MACHINE INDUSTRY Co Ltd
Publication of EP0336367A2 publication Critical patent/EP0336367A2/fr
Publication of EP0336367A3 publication Critical patent/EP0336367A3/fr
Withdrawn legal-status Critical Current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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work

Definitions

  • the present invention is generally directed to a double-side simultaneous coating equipment, and more particularly, to a double-side simultaneous coating equipment which may be classified into a reverse roll coater suitable for simultaneously applying an aqueous dispersion especially of a fluorocarbon-based polymer on both sides of a base material formed of a plastic film or the like.
  • This type of equipment is arranged such that: a base material (4) formed of a sheet of paper fed out from an unwinder (1) via a guide roll (6) to a steel roll (5) immersed in an immersion tank (2); and after both surfaces of which have been coated with a coating liquid (7), the coating liquid (7) is forced to penetrate into the base material (4) by squeezing it with scraper rolls (3) and (3′), thus obtaining a base material (8) both sides of which have been coated with the coating liquid (7).
  • This type of equipment is effective in a case where the coating liquid (7) penetrates into the base material (4).
  • FIG. 2 there is depicted another typical coating equipment classified as a transfer type equipment.
  • the arrangement is such that: a base material (4) fed out of an unwinder (1) passes through guide roll (6); and the transfer and coating are effected at almost the same moment by coater rolls (11) and (11′) as well as by pickup rolls (10) and (10′) which scoop up adequate amounts of coating liquids (7) and (7′) within coating liquid tanks (9) and (9′) by use of cleaning doctors (12) and (12′).
  • This type of coating equipment is capable of providing a well-coated material, if a transfer efficienty is high (i.e., when the base material and the coating liquid are suitably combined).
  • a coating liquid for instance, a fluorine aqueous dispersion, having a low transfer efficiency depending on affinity of the base material and on the liquid nature itself, it is impossible to obtain a product with a high quality, especially good appearance.
  • the present inventor has, in light of the above situation of the prior art, keenly pursued a study of the double-side simultaneous coating equipment suited to coat the fluorine aqueous dispersion on both surfaces of a plastic film.
  • the present inventor has devised a reverse roll coater type of double-side simultaneous coating equipment which accomplishes the above-­described object, wherein the equipment is characterized in that two coater rolls are positioned closed to each other, preferably till reaching a distance equivalent to a thickness of the base material, so that the respective coater rolls are disposed to serve as backup rolls for the other coater head.
  • the present invention encompasses a coating equipment for simultaneously coating an aqueous dispersion on both sides of a base material, a reverse roll coater type of double-side simultaneous coating equipment, wherein there are provide two coater heads including at least pickup rolls and coater rolls and the two coater rolls are positioned close to each other, preferably till reaching a distance equivalent to a thickness of a base material, the respective coater rolls being so disposed to serve as backup rolls for the other coater head.
  • the base material employed in this invention is not particularly limited, but a plastic film may be suitable especially for the base material.
  • the plastic film may include heat-resistant plastic films such as a polyimide film, a polyamide film, a polyparabanic acid film and an aromatic polyamide film.
  • the film thickness is not particularly limited, but if the film is excessively thin, a breakage will be caused therein. Inversely, in the case of its being too thick, the close-contact with the coater rolls will become unstable. For this reason, the thickness is preferable in a range of from 5 ⁇ m to 300 ⁇ m.
  • the aqueous dispersion used in this invention is not particularly limited but this invention is especially suited to a fluorine-based dispersion with a low transfer efficiency.
  • the fluorine dispersion is defined as an aqueous dispersion containing fluorine, more specifically, fluorocarbon polymers such as tetrafluoroethylene polymer (TFE), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-perfluoroalkylvinylether copolymer (PFA), tetrafluoroethylene-ethylene copolymer (ETFE) and polychlorotrifluoroethylene.
  • TFE tetrafluoroethylene polymer
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • PFA tetrafluoroethylene-perfluoroalkylvinylether copolymer
  • ETFE tetrafluoro
  • a solid concentration of the dispersion is preferable in a range of from 10 wt% to 70 wt%.
  • concentration is, however, determined depending on a thickness of final products, a viscosity of the dispersion and the like.
  • the dispersion viscosity is preferably 1 cp to 100 p, more preferably 50 cp to 5 p. If the viscosity is lower than 1 cp or exceeds 100 p, the transfer efficiency decreases, and the coated surfaces are poor in appearance.
  • the following agents are added to the dispersion, which include a thickener for adjusting the viscosity, a solvent such as methanol and an anti-foaming agent for eliminating the foams generated when effecting the coating process, or a pigment for coloring the dispersion.
  • each of two coater heads is composed of two rolls, viz., a pickup roll (23) or (23′) and a coater roll (24) or (24′).
  • FIG. 3 shows a case where a base material (25) is pulled up
  • FIG. 4 illustrates a case where the base material (25) is pulled in the horizontal direction.
  • the base material (25) is fed out of an unwinder (21), and subsequently coating liquids (27) and (27′) are scooped up by pickup rolls (23) and (23′) from coating liquid tanks (22) and (22′). Both sides of the base material (25) are almost simultaneously coated with the coating liquids by means of coater rolls (24) and (24′), thus obtaining a base material (28), the two sides of which have been coated with the coating liquids.
  • pickup rolls (23) and (23′) are preferably formed of rubber, while coater rolls (24) and (24′) are formed of steel in terms of accuracy in thickness of the coating.
  • the pickup roll of one of two coater heads is arranged to be a steel roll, while the coater roll is arranged to be a rubber roll.
  • Pickup rolls (23) and (23′) do not have cleaning doctors.
  • a clearance between coater rolls (24) and (24′) is set slightly wider than the thickness of the base material (25).
  • the lower limit of clearance is just the base material thickness and the upper limit is set enough to exhibit a function of the respective coater rolls as backup rolls.
  • the upper limit value is, though it depends on the coating thickness, approximately a 3-fold thickness of the base material.
  • the clearance between two coater rolls (24) and (24′) sufficiently approximates to the thickness of the base material (25), the function of the backup rolls is sufficiently exhibited, thereby the transfer efficiency being increased. Accordingly, when attaining the same coating thickness, it is required that a ratio of the speed of the coater roll surface to that of the base material be small. In contrast, the clearance between two coater rolls (24) and (24′) is far from the thickness of the base material (25), the function as backup rolls decreases, and the transfer efficiency decreases. It is therefore necessary to increase the ratio of the speed of the coater roll surface to that of the base material.
  • the coater rolls (24) and (24′) are rotated in the opposite direction to the direction in which the base material (25) advances.
  • the pickup rolls (23) and (23′) may be rotated in any direction.
  • the rotational direction is restricted. Namely, the coater roll (24′) is rotated in the reverse direction to the moving direction of the base material (25), whereas the pickup roll (23′) is rotated in the moving direction of the base material (25).
  • FIGS. 5 and 6 respectively show other embodiments of the coating equipment according to the present invention.
  • the coater heads individually consist of three kinds of rolls, viz., pickup rolls (23) and (23′), metering rolls (29) and (29′), and coater rolls (24) and (24′).
  • FIG. 5 illustrates a case where a base material (25) is pulled up
  • FIG. 6 shows a case where the base material (25) is pulled in the horizontal direction.
  • the base material (25) is fed out of an unwinder (21). Subsequent to this step, coating liquids (27) and (27′) are scooped up by pickup rolls (23) and (23′), and weights thereof are measured by means of metering rolls (29) and (29′), then the two sides of base material (25) are almost simultaneously coated with the coating liquids by the coater rolls (24) and (24′), thus the base material (28), both sides of which are coated with the liquids are obtained.
  • the coater rolls (24) and (24′) are preferably formed of steel, while the metering rolls (29) and (29′) are preferably formed of rubber in terms of accuracy in thickness of coating.
  • the coater roll may be arranged to be a rubber roll, while the metering roll may be arranged to be a steel roll. If the metering roll is made of steel, the pickup roll is made preferably of rubber, and vice versa. As is obvious from FIGS. 5 and 6, pickup rolls (23) and (23′) are not possessed of the cleaning doctors.
  • the clearance between two coater rolls (24) and (24′) has the same relation as that shown in FIGS. 3 and 4.
  • a relation in speed between the base material (25) and the surfaces of coater rolls (24) and (24′) is the same as that shown in FIGS. 3 and 4.
  • coater rolls (24) and (24′) are rotated in the opposite direction to the moving direction of the base material (25).
  • the pickup and metering rolls (23) and (23′), (29) and (29′) may be rotated in any direction. As illustrated in FIG. 6, however, when the coating liquid (27′) is supplied from upper coating liquid tank (22′), the rotational direction is restricted.
  • the pickup roll (23′) is rotated in the moving direction of the base material (25), whereas the metering roll (29′) is rotated in the reverse direction to the moving direction of the base material (25).
  • the coater heads are constituted respectively by coater rolls and coating knives, (24) and (24′), (30) and (30′) for measuring an amount of coating.
  • a base material (25) is fed out of an unwinder (21), and the weights of coating liquids (27) and (27′), which have been adhered to coater rolls (24) and (24′), are measured by coating knives (30) and (30′) on coater rolls (24) and (24′). Thereafter, the coating is almost simultaneously effected on both surfaces of the base material (25), and the base material (28), the two sides of which are coated with the coating liquids, is thus obtained.
  • the clearance between two coater rolls (24) and (24′) has the same relation as that shown in FIGS. 3 and 4.
  • the material of which coater rolls (24) and (24′) are formed may be steel or rubber. If any one of two coater rolls is made of steel, however, the other coater roll is preferably a rubber roll.
  • the rotational directions of the coater rolls are conditioned by the positional relations between coating knives (30) and (30′), and coater rolls (24) and (24′).
  • the rotational directions of the coater rolls are opposite to the direction in which the base material (25) is fed out.
  • the speed of the coater roll surfaces may be equal to that of the base material.
  • the films on the coater rolls are preferably thinned. For this reason, a ratio of the coater roll surface speed to that of the base material is set to a value of 1.1 to 20 and a preferable method is that the thin films are repeatedly transferred 1.1 to 20 times on the base material.
  • a variety of coating knives are available for use.
  • a preferably "cow-nose-shaped knife" depicted in FIG. 7 is adopted.
  • the reverse roll coater type of double-side simultaneous coating equipment has the following features.
  • the first feature is that the respective coater rolls of the two coater heads serve as backup rolls for the other coater roll.
  • a spacing between the two coater rolls is equivalent to the thickness of the base material passing therethrough, in other words, the clearance therebetween is slightly larger than the thickness of the base material, thereby providing the function as backup rolls. Consequently, the efficiency of transfer from the coater rolls onto the base material remarkably increases.
  • the second feature is characterized by such an arrangement that the pickup rolls are not provided with a scraper plate corresponding to a cleaning doctor.
  • the use of the cleaning doctor entails striped residuals of coating liquids on the pickup rolls. This in turn causes the deterioration in appearance, because such striped residuals are directly transferred thereon.
  • there is no necessity for using the scraper plate so that it is possible to obtain films having a well-finished appearance.
  • the coating equipment according to the present invention can be adopted in cases where the steps (drying, cure, etc.) after the coating process has been carried out are the same, for instance, as a matter of course, when applying the coating liquids on the two surfaces of the base material, or even in the case of different coating liquids.
  • a method of preparing a coating liquids is given as follows.
  • the coating liquid obtained in the above-described manner was applied to both surfaces of a polyimide film (APICAL 25AH made by Kanegafuchi Chemical Industry Co., Ltd.) which was 250 mm in width and 25 ⁇ m in thickness till each thickness of FEP layers in terms of solid on the both surfaces reached 2.5 ⁇ m by use of the coating equipment depicted in FIG. 3.
  • the specifications and conditions of the coating equipment are given as below: (Specifications of the double-side coating equipment)
  • Coater roll steel roll having a diameter of 150 ⁇ and a face length of 300 mm
  • Pickup roll silicone rubber roll (hardness: 70 degrees) having a diameter of 150 ⁇ and a face length of 300 mm
  • Coater roll silicone rubber roll (hardness 70 degrees) having a diameter of 150 ⁇ and a face length of 300 mm
  • Pickup roll steel roll having a diameter of 150 ⁇ and a face length of 300 mm
  • Peripheral velocity of the coater roll 30 m/min at reverse rotation
  • the coated film was placed in a drying furnace for 30 sec. at a temperature of 100 °C and consecutively in a cure furnace for 30 sec. at a temperature of 400°C.
  • a composite film in which both surfaces of a polyimide film having a thickness of 25 ⁇ m were provided with FEP layers each having a thickness of 2.5 ⁇ m.
  • the appearance of this composite film was well finished to acquire a uniform thickness (a means thickness is approximately 31 ⁇ m to 29 ⁇ m).

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  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP89105881A 1988-04-05 1989-04-04 Dispositif pour enduire simultanément les côtés opposés d'un substrat Withdrawn EP0336367A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63084843A JP2700322B2 (ja) 1988-04-05 1988-04-05 両面同時塗布装置
JP84843/88 1988-04-05

Publications (2)

Publication Number Publication Date
EP0336367A2 true EP0336367A2 (fr) 1989-10-11
EP0336367A3 EP0336367A3 (fr) 1990-08-08

Family

ID=13842079

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105881A Withdrawn EP0336367A3 (fr) 1988-04-05 1989-04-04 Dispositif pour enduire simultanément les côtés opposés d'un substrat

Country Status (2)

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EP (1) EP0336367A3 (fr)
JP (1) JP2700322B2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480897A1 (fr) * 1990-10-12 1992-04-15 Valmet Corporation Dispositif pour le dosage d'un agent à appliquer à une base en mouvement
RU2176562C1 (ru) * 2001-01-05 2001-12-10 Чуланов Валерий Евгеньевич Устройство для нанесения жидкого покрытия на протяженное изделие, преимущественно дистанционную рамку стеклопакета
CN113769990A (zh) * 2021-08-20 2021-12-10 山东亿隆薄膜材料有限责任公司 一种薄膜双面立式涂布机构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002361152A (ja) * 2001-06-04 2002-12-17 Tdk Corp 両面塗布装置及び電池用電極の製造方法
KR102351006B1 (ko) * 2021-08-26 2022-01-12 노일호 코팅기기

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4198446A (en) * 1978-02-14 1980-04-15 Ncr Corporation Apparatus for the manufacture of a dual coated manifold sheet with pressure-rupturable materials
GB2046640A (en) * 1978-11-13 1980-11-19 Wallsten H Method and apparatus for the double-sided coating of a moving web of material preferably a paper web
JPS6316868U (fr) * 1986-07-17 1988-02-04

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0480897A1 (fr) * 1990-10-12 1992-04-15 Valmet Corporation Dispositif pour le dosage d'un agent à appliquer à une base en mouvement
RU2176562C1 (ru) * 2001-01-05 2001-12-10 Чуланов Валерий Евгеньевич Устройство для нанесения жидкого покрытия на протяженное изделие, преимущественно дистанционную рамку стеклопакета
CN113769990A (zh) * 2021-08-20 2021-12-10 山东亿隆薄膜材料有限责任公司 一种薄膜双面立式涂布机构

Also Published As

Publication number Publication date
EP0336367A3 (fr) 1990-08-08
JP2700322B2 (ja) 1998-01-21
JPH01258761A (ja) 1989-10-16

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