US3782995A - Method of coating both surfaces of a web - Google Patents

Method of coating both surfaces of a web Download PDF

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Publication number
US3782995A
US3782995A US00052496A US3782995DA US3782995A US 3782995 A US3782995 A US 3782995A US 00052496 A US00052496 A US 00052496A US 3782995D A US3782995D A US 3782995DA US 3782995 A US3782995 A US 3782995A
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United States
Prior art keywords
web
coated
coating
colloidal solution
solution
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.)
Expired - Lifetime
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US00052496A
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English (en)
Inventor
A Takagi
H Takimoto
M Minoda
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film 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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
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Publication of US3782995A publication Critical patent/US3782995A/en
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    • 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
    • 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
    • G03C2001/7425—Coating on both sides

Definitions

  • the present invention relates to a method of coating both surfaces of a Web, and more specifically to a method of coating a colloidal solution onto both surfaces of a running web.
  • the web Since the web is subject to two processes of coating and drying in such a conventional method, the production efficiency is low and the quality is deteriorated by twice passing the web through the drying device.
  • the surface of the web which is coated the first time is dried twice, and accordingly, the quality of the photosensitive layer on this surface is not as high as that of the other layer. Since the time necessary for completing the entire process of coating and drying is rather long in the abovedescribed conventional method, the probability of dust sticking is high.
  • the principal object of the present invention is to provide a method of coating both surfaces of a flexible running web.
  • Another object of the present invention is to provide a method of coating a colloidal solution on both surfaces of a flexible running web, in which one surface of the web is coated with the colloidal solution after the other surface of the web is coated and before the lfirst coated surface is dried.
  • Still another object of the present invention is to provide a method of coating a colloidal solution on both surfaces of a flexible running web, in which one surface of the web is coated with the colloidal solution after the other surface of the web is coated and gelled, and before the iirst coated surface is dried, at a position where the web is supported by a supporting roller which is in contact with the surface of the web bearing the gelled ⁇ colloidal coating.
  • the present invention provides a method of coating a flexible web on both surfaces thereof which overcomes the above-described drawbacks of the conventional methods.
  • a colloidal solution is first coated on one surface of a flexible web and then advanced to another coating position for coating the colloidal solution on the opposite surface thereof, wherein the coated solution on the first surface of the web is not dried but only gelled.
  • the surface of the web bearing the gelled colloidal solution is brought into contact with a supporting roller at the position where the opposite surface is coated.
  • FIG. 1 shows an elevational view in section of the apparatus used for carrying out the method of the present invention.
  • the flexible web 1 running from the web feeding source 15 is brought to the rst coating position 2, wherein one surface a of the flexible web 1 is coated with a colloidal solution 4 by means of coating device 3.
  • the liexible web 1, coated on one surface thereof, is further fed through a rst cold air set portion 5 while being supported by a plurality of supporting rollers 9 which are in contact with the opposite surface b of the exible web 1, whereby the coated surface a of web 1 and the colloidal solution 4 coated on surface a are cooled and gelled by the cold air forced through the ejection nozzles 16 which is supplied by cold aid duct 13 to cold air chamber 17.
  • the temperature of the cold air varies from -10 C. to 10 C.
  • the coated colloidal solution 4 is uniformly cooled an gelled to the extent that the gelled colloid is not damaged by contact with a solid surface.
  • Flexible web 1 is then brought to a second coating position 6.
  • surface a bearing the gelled colloid thereon is brought into direct contact with the surface of roller 7 which is rotatable about a stationary axis and supports the web 1, and the opposite surface of the web 1 is then coated with a colloidal solution 11 by means of coating device 10. That is, flexible web 1 is supported by roller 7 while uncoated surface b thereof is being coated.
  • the concentration of the solution to be coated should be selected in view of the resulting jelly strength and the amount of water which is liberated. Generally, the concentration of the colloidal solution varies from to 20 weight percent.
  • the colloidal solutions 4 and 11 coated on both surfaces of web 1 are then cooled and gelled in a second cold air set portion 8 after both surfaces of web 1 have been coated.
  • web 1 is brought into the drying portion 12 by a web feeding system which feeds the web without contacting the same.
  • the cold air is exhausted through duct 14 after the air is used for cooling web 1.
  • the flexible web 1 in the case of photographic photosensitive material, cellulose triacetate, polyethyleneterephthalate, polystyrene, polycarbonate or polyolefin Webs, and the like, having a thickness of from 50 to 300M are generally used.
  • the coating devices 3 and 10 used for coating the colloidal solution onto the flexible web 1 at the coating positions 2 and 6 may be of any type conventionally known. Of course, a multi-layer coating device can be used as the coating device 3 or 10.
  • the thickness of the colloidal layers varies from 0.05 mm. to 0.15 mrn.
  • the colloidal solutions 4 and 11 to be coated on the surfaces of the ilexible web may be any type of colloidal solution, such as gelatinous silver halide, a gelatin solution used to protect an emulsion layer, a gelating solution used for an anti-halation layer in the case of photographic material, etc.
  • colloidal solution such as gelatinous silver halide, a gelatin solution used to protect an emulsion layer, a gelating solution used for an anti-halation layer in the case of photographic material, etc.
  • cold air is only an example of a single means for cooling the web, and it should be understood that any type of cooling means such as cooling Water and other suitable cooling media can be employed, so long as the coated web is cooled suiiiciently to gel the colloidal solution coated onto the web 1.
  • means for accelerating the coagulation of the coated material by chemical reaction can be employed for cooling and gelling the coated colloidal solution on the web.
  • colloidal solution it is important for the colloidal solution to have a sufiicient jelly strength and not to have a high degree of fluidity so that when the colloidal solution is cooled and gelled on one surface of the web 1, it may not be damaged when the coated surface of the web is brought into contact with the supporting roller after being coated but before being completely dried.
  • the colloidal solution changes from a sol condition to a gel condition.
  • the coating device and the colloidal solution 11 to be coated on the uncoated surface b of the flexible web 1 at the second coating position 6 l may be the same as Were employed at the first coating position 2.
  • the surface of supporting roller 7 is preferably smooth enough so as not to damage the surface of the colloidal solution layer 4 which has been gelled on surface a of flexible Web 1.
  • the supporting roller 7 is preferably made of stainless steel, and the like, from the view point of accuracy in dimensions, ⁇ but it might be desirable to provide a lining of Teflon, or the like, thereon in order to prevent sticking and to provide ease of separation between the coated surface of the web and the surface of roller 7.
  • the coating in accordance with the present invention utilizes the characteristic of the colloidal solution that the colloidal solution, after being coated on the flexible web, is not damaged by external mechanical operations and has enough elasticity to recover its original shape after removal of the external pressure after the colloidal solution is gelled, and that the colloidal solution coated on the web may have a surface layer of liberated water content which serves as a protector for the colloidal layer and also functions as a lubricant between the colloidal layer and the surface of the roller.
  • the present invention provides several advantages as follows.
  • the feeding of the flexible web is easy and certain. This contributes to the improvement of the products particularly to a constant coating thickness and a uniform coating quality. That is, vibration of the flexible running web is prevented by the supporting roller, which results in a uniform coating of the solution.
  • the gellation of the colloidal solution on the web after coating is made by cooling the single surface of the web, the gellation of the colloidal solution is performed faster than the case wherein the opposite surface of the web is cooled at the same time. Accordingly, the effect of the drying process is also improved.
  • EXAMPLE I In a process for making lithographie printing tlilm, cc./m.2 of a gelatin solution was coated onto one surface of a flexible web at a first coating position to thereby form a curling-balance and anti-halation layer. At the cooling position adjacent to the first coating position, the resultant coated solution was gelled by means of cold air at -3 C. After the coated solution was gelled by the cold air, the flexible Web was supported on the coated side by a roller, maintained at a temperature (0 C.) which will not affect the coated colloidal solution, at the second coating position. The coated side of the flexible web was in contact with the supporting roller.
  • the opposite uncoated surafce of the web was coated first with 85 cc./m.2 of a gelatinous silver halide emulsion solution and then with 25 cc./m.2 of a gelatin solution as a protection layer, superimposed over the first layer. After the two solutions Were coated, cold air at a temperature of 4 3 C. was used for cooling and gelling the second coated solution. Then both coated surfaces of the flexible web were dried. The film thus produced had good quality and no damage on the coated layer was recognized on the side of the web Which was coated first.
  • EXAMPLE II In a process for making office-use copying film, 85 cc./m.2 of a gelatinous silver halide emulsion solution was coatedon a lirst surface of a flexible web and then cooled by means of cold air at 3 C. After the coated solution was cooled and gelled, the coated surface of the web was brought into contact with a stationary supporting roller where 85 cc./m.2 of a gelatin solution was coated on the opposite surface of the web to form a curlingbalance and anti-halation layer. After the solution was coated on the second uncoated surface, the resulting coated surface was cooled and the coated material thereon was gelled by means of a cold air at 3 C. Then, both surfaces of the web were dried. Good results were obtained, as in Example I.
  • a method of coating both surfaces of a flexible web consisting essentially of coating a colloidal solution on a rst surface of said exible web, cooling and gelling said colloidal solution coated on said rst surface of said web until water is liberated on the surface of the gelled solution to form a water surface layer, supporting said web on a roller which is disposed in contact with the Water covered gelled colloidal solution on said rst surface of said web, and coating a colloidal solution on the second surface of said flexible web while said web is supported by said roller, cooling and gelling said coating on said second surface and drying both surfaces of said coated flexible web.
  • colloidal solution is a gelatino silver halide emulsion.
  • each of said coatings varies from 0.05 mm. to 0.15 mm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US00052496A 1969-07-03 1970-07-06 Method of coating both surfaces of a web Expired - Lifetime US3782995A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44052719A JPS4844171B1 (enrdf_load_stackoverflow) 1969-07-03 1969-07-03

Publications (1)

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US3782995A true US3782995A (en) 1974-01-01

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Family Applications (1)

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US00052496A Expired - Lifetime US3782995A (en) 1969-07-03 1970-07-06 Method of coating both surfaces of a web

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US (1) US3782995A (enrdf_load_stackoverflow)
JP (1) JPS4844171B1 (enrdf_load_stackoverflow)
CA (1) CA974132A (enrdf_load_stackoverflow)
GB (1) GB1318635A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945225A (en) * 1973-05-25 1976-03-23 Mccoy Lyle E Continuous textile dyeing apparatus
DE2812351A1 (de) * 1977-03-22 1978-09-28 Fuji Photo Film Co Ltd Verfahren zum beidseitigen oberflaechenbeschichten einer bahn
US4263358A (en) * 1975-03-01 1981-04-21 Bodina, Ltd. Multizonal binder impregnation
US4415610A (en) * 1981-05-04 1983-11-15 Polaroid Corporation Process simulator
US5006432A (en) * 1987-10-28 1991-04-09 Kabushiki Kaisha Toshiba Method for manufacturing a shadow mask
US5342446A (en) * 1991-05-21 1994-08-30 Eastman Kodak Company Apparatus for coating a continuous web
RU2250984C1 (ru) * 2004-01-05 2005-04-27 Государственное образовательное учреждение высшего профессионального образования Тюменский государственный нефтегазовый университет Облегченный тампонажный раствор
US20050115494A1 (en) * 2002-06-24 2005-06-02 Martin Tietz Device for coating and drying both sides of a material web of paper or board
EP1557625A3 (de) * 2004-01-23 2005-08-10 Icopal Coating GmbH Beschichtungsanlage
US8739727B2 (en) 2004-03-09 2014-06-03 Boston Scientific Scimed, Inc. Coated medical device and method for manufacturing the same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0060114B1 (en) * 1981-03-11 1986-01-22 Drg (Uk) Limited Improvements in coating methods
DE3739873C1 (de) * 1987-11-25 1989-01-19 Kurt Hausmann Verfahren und Vorrichtung zum Beschichten eines bahnfoermigen Substrats
JP2821506B2 (ja) * 1990-04-05 1998-11-05 コニカ株式会社 ハロゲン化銀写真感光材料の製造方法

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945225A (en) * 1973-05-25 1976-03-23 Mccoy Lyle E Continuous textile dyeing apparatus
US4263358A (en) * 1975-03-01 1981-04-21 Bodina, Ltd. Multizonal binder impregnation
DE2812351A1 (de) * 1977-03-22 1978-09-28 Fuji Photo Film Co Ltd Verfahren zum beidseitigen oberflaechenbeschichten einer bahn
US4455327A (en) * 1977-03-22 1984-06-19 Fuji Photo Film Co., Ltd. Dual surface film coating of running web
US4415610A (en) * 1981-05-04 1983-11-15 Polaroid Corporation Process simulator
US5006432A (en) * 1987-10-28 1991-04-09 Kabushiki Kaisha Toshiba Method for manufacturing a shadow mask
US5342446A (en) * 1991-05-21 1994-08-30 Eastman Kodak Company Apparatus for coating a continuous web
US20050115494A1 (en) * 2002-06-24 2005-06-02 Martin Tietz Device for coating and drying both sides of a material web of paper or board
US7563326B2 (en) * 2002-06-24 2009-07-21 Voith Paper Patent Gmbh Device for coating and drying both sides of a material web of paper or board
RU2250984C1 (ru) * 2004-01-05 2005-04-27 Государственное образовательное учреждение высшего профессионального образования Тюменский государственный нефтегазовый университет Облегченный тампонажный раствор
EP1557625A3 (de) * 2004-01-23 2005-08-10 Icopal Coating GmbH Beschichtungsanlage
US8739727B2 (en) 2004-03-09 2014-06-03 Boston Scientific Scimed, Inc. Coated medical device and method for manufacturing the same

Also Published As

Publication number Publication date
JPS4844171B1 (enrdf_load_stackoverflow) 1973-12-22
CA974132A (en) 1975-09-09
GB1318635A (en) 1973-05-31

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