Coating processes – Magnetic base or coating – Magnetic coating
Patent
1993-04-13
1994-04-26
Pianalto, Bernard
Coating processes
Magnetic base or coating
Magnetic coating
427130, 427131, 427322, 427356, 427371, 4274121, H01F 1002
Patent
active
053065239
ABSTRACT:
A coating method and apparatus which enables high-speed coating with a minimum of defects such as streaks including cases where the surface tension of the coating solution is relatively high. The method includes the following steps: applying an excess amount of a cleaning fluid to the substrate; scraping off the cleaning fluid at a first scraping section; applying an excess amount of the coating solution to the substrate while a remaining portion of the cleaning fluid remaining on the substrate is in an undried state; and scraping off a surface-side portion of the coating solution at a second scraping section, thereby metering the amount of the coating solution to be applied. In addition, a similar object is attained by a coating method wherein, in the aforementioned coating method, the organic solvent has a viscosity of not more than 10 cp, and in a case where the surface tension of the cleaning fluid is .sigma.c (dyne/cm) and the surface tension of the coating solution is .sigma.l (dyne/cm), the surface tension of the cleaning fluid satisfies the relation .sigma.l-7.ltoreq..sigma.c .ltoreq..sigma.l.
REFERENCES:
patent: 4552799 (1985-11-01), Ryoke et al.
Fuji Photo Film Co. , Ltd.
Pianalto Bernard
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