Method and apparatus for electrically controlling coating layer

Details Method and apparatus for electrically controlling coating layer Method and apparatus for electrically controlling coating layer

1987-06-01

1989-05-02

Lawrence, Evan

Coating processes

Measuring, testing, or indicating

Thickness or uniformity of thickness determined

118624, 118625, 118626, 427 26, 427 30, 427 32, B05D 500, B05D 106, B05B 504

Patent

active

048267031

ABSTRACT:
A method and apparatus are provided for controlling the width and improving edge thickness uniformity of a layer of coating material electrostatically deposited on a moving web surface. The apparatus preferably includes a coating applicator, a rotatably mounted web-supporting backing roll spaced therefrom and a source of electrical power coupled between applicator and backing roll for generating a coating material charging and transporting electrostatic field capable of transporting the charged coating material from the applicator to a web surface as the web moves between applicator and backing roll for web coating purposes. The apparatus additionally includes a pair of electrodes coupled to a source of electrical power and mounted in an opposed relation on opposite sides of the charged coating material moving between the coating applicator and the web surface spaced therefrom. Electrode potential is adjusted to a level that will interact with the charged coating material passing therebetween and thereby cause a layer of coating material of predetermined width and improved edge thickness uniformity to be deposited on a selected portion of a moving web surface.

REFERENCES:
patent: 2685536 (1954-08-01), Starkey et al.
patent: 2780565 (1957-02-01), Juvinall
patent: 3402697 (1968-09-01), Kock
patent: 3512502 (1970-05-01), Drum
patent: 4457256 (1984-07-01), Kisler et al.

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