Coating method and apparatus

a coating method and coating technology, applied in the direction of coatings, instruments, photosensitive materials, etc., can solve the problems of uneven coating, stripe generation in the coating layer, and inability to meet the demand of obtaining a magnetic layer with thin film thickness

Inactive Publication Date: 2005-01-27
FUJIFILM HLDG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] The present invention is devised in consideration of such circumstances and aims to provide a coating method and an apparatus for being able to perform ultrathin and uniform coating on a web without causing a coating defect in scraping-off type coating.

Problems solved by technology

However, since there is a limit in the thickness of a possible coating layer even when coating is performed by this extrusion type of coating apparatus, there is a problem that it is not possible to sufficiently respond to a demand of obtaining a magnetic layer with thin film thickness.
In addition, there is a defect that a stripe is easily generated in the coating layer due to web cut at the point of the coating head.
Nevertheless, though a conventional doctor blade scraping-off type coating apparatus is a coating apparatus that comparatively easily forms a thin coating layer without a coating stripe, there is a defect that the following coating defects may be caused when an ultrathin magnetic layer, which is unprecedented and is 2 μm or less in a moist state, like those of magnetic recording media in recent years is formed.
(4) Uneven coating may be caused in the web width direction.
(5) A detailed unevenness may be generated as a coating surface gets rough.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0094]FIG. 1 is a conceptual drawing showing the entire configuration of a scraping-off type coating apparatus 10 according to the present invention, and FIG. 2 is an enlarged view of an end section of a doctor blade.

[0095] As shown in FIG. 1, the coating apparatus 10 mainly comprises: a precoating apparatus 14 applying coating liquid more excess than the desired coating quantity on a web 12 traveling continuously; a doctor blade 17 as a scraping-off member 16 that scraps off an excess of coating liquid; support rollers 18 and 18 that press the web 12 against the doctor blade 17; and a pressure distribution adjusting device 20 that adjusts the pressure distribution in a web width direction. In addition, though a backed-up extrusion type coating head will be exemplified as the precoating apparatus 14, the present invention is not limited to this. But, with providing each support roller in upstream and downstream sides of the precoating apparatus 14 without using a backup roller 26, ...

embodiment 2

[0119] Next, the second embodiment of the present invention will be described with assigning the same reference numerals to the same members as those in the first embodiment.

[0120] As shown in FIG. 9, a coating apparatus 100 where a coating method of the present invention is applied mainly comprises: a precoating apparatus 14 applying coating liquid excessive than the desired coating quantity on a web 12; a scraping-off member (applicator) 16 that scraps off an excess of the coating liquid excessively applied; support rollers 18 and 18 that gives pressure with pressing the web 12 against the scraping-off member 16; and a pressure distribution adjusting device 121 that adjusts the coating thickness distribution in a web width direction before scraping off the excess of the coating liquid by the scraping-off member 16.

[0121] The coating apparatus 100 is constituted by using the backed-up extrusion type coating head 22 as the precoating apparatus 14, the doctor blade 17 as the scrapi...

embodiment 3

[0149] Next, the third embodiment of the present invention will be described with assigning the same reference numerals to the same members as those in the first and second embodiments.

[0150]FIG. 18 is a conceptual drawing showing the entire configuration of a scraping-off type coating apparatus where a coating method according to the present invention is applied.

[0151] A coating apparatus 200 mainly comprises: a precoating apparatus 14 applying coating liquid excessive than the desired coating quantity on a web 12; a scraping-off member (applicator) 16 that scraps off an excess of the coating liquid excessively applied; support rollers 18 and 18 that gives pressure between the web 12 and the scraping-off member 16; and a variance suppressing device 220 that suppresses a factor of thickness variance so as to obtain a coating layer where the thickness variance in a web traveling direction after the scraping-off.

[0152] The coating apparatus 200 in FIG. 18 is a post-measurement syst...

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Abstract

It is possible to give ultrathin and uniform coating on a flexible web in scraping-off type coating. The distribution of pressure in a web width direction is adjusted by a pressure distribution adjusting device when an excess of coating liquid excessively applied is scraped off by a doctor blade by giving relative pressure to a coating surface of a web and the doctor blade after applying the coating liquid that is more excessive than the desired quantity of the coating liquid on the web by a precoating apparatus while making the web continuously travel.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a coating method and an apparatus, and in particular, to a coating method and an apparatus for applying a substrate used for the production of photosensitive material and a magnetic recording medium. [0003] 2. Description of the Related Art [0004] Each of photosensitive material and magnetic recording media is produced through a coating step of forming a coating film by applying predetermined coating liquid such as magnetic liquid on a continuously running flexible substrate (hereinafter referred to as a web). In particular, since the capacity and recording density of magnetic recording media such as magnetic recording tapes are rapidly improved as the use for broadcasting and computers, the coating technology of being able to obtain a magnetic layer having thin film thickness and smooth surface has been requested. [0005] As methods of applying coating liquid on a web surface, there ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05C5/02B05C11/02B05C11/04B05D1/26B05D1/42G03C1/74G11B5/848
CPCB05C5/0254B05C5/0262B05C11/02B05C11/025B05C11/04B05C11/041B05C11/045G11B5/848B05D1/265B05D1/42G03C1/74G03C2001/7459
Inventor TOMARU, MIKIOMANDAI, TOSHIHIROSHIBATA, NORIO
Owner FUJIFILM HLDG CORP
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