Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1988-04-04
1989-03-07
Lawrence, Evan
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118624, 118626, 427 141, 427 32, B05D 106, B05D 502
Patent
active
048105228
ABSTRACT:
A method and apparatus for electrostatically applying a layer of coating material to a moving substrate. In a preferred embodiment, a threaded shaft formed of dielectric material, having one end thereof coupled to a drive motor, has a portion of its threads mounted for rotation through a bath of coating material. An electrostatic field of predetermined magnitude is established between the coating material and a substrate surface spaced therefrom. The electrostatic field atomizes coating material accumulating on the ridge portion of the rotating thread and subsequently deposits a layer of the atomized coating material on the adjacent substrate surface as it is moved past the rotating dielectric thread at a predetermined angle with respect to the axis of rotation of the threaded shaft.
REFERENCES:
patent: 2685536 (1954-08-01), Starkey et al.
patent: 2777784 (1957-01-01), Miller
patent: 2893894 (1959-07-01), Ransburg
patent: 4457256 (1984-07-01), Kisler et al.
U.S. application Ser. No. 32,606, filed Apr. 1, 1987 by Semyon Kisler et al., for Method and Apparatus for Applying Ultra-Thin Coatings to a Substrate.
Kelleher John J.
Lawrence Evan
Polaroid Corporation
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