Method and apparatus for applying a coating liquid to a moving w

Details Method and apparatus for applying a coating liquid to a moving w Method and apparatus for applying a coating liquid to a moving w

1988-07-18

1989-05-30

Lawrence, Evan

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

118624, 118638, 427316, 430127, 430935, B05D 314, B05D 126, B05B 502

Patent

active

048350044

ABSTRACT:
The invention relates to a method and apparatus for treating a moving web prior to the applying of a photosensitive coating liquid. In order to suppress the entrapment of air between the coating layer and the web, the surface of the web is electrostatically charged so that the coating liquid will be attracted to the web. Wide variations of the potential distribution across the web are avoided by subjecting the web to heat while simultaneously bleeding off part of the surface potential. The heating step increases the mobility of electrostatic charge and accelerates the charge redistribution across the web. The web is subsequently cooled to a temperature between 5.degree. and 25.degree. C. in order to preserve the surface potential of the web until the web is coated.

REFERENCES:
patent: 2952559 (1960-09-01), Nadeau
patent: 3462286 (1969-08-01), Geest et al.
patent: 4513683 (1985-04-01), Kisler
patent: 4517143 (1985-05-01), Kisler

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