Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1976-01-21
1978-08-22
Smith, Ronald H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
118621, 118622, 118627, 222195, 239 3, 361226, 427 27, 427 33, B05D 106, B05B 502
Patent
active
041090276
ABSTRACT:
Disclosed is an electrostatic coating device and method employing highly charged particles that are charged remote from the articles to be coated and then delivered to an area where they are to be applied by conveying them in a moving air stream. The movement is stopped by closing off the air stream, suspending the particles in space. Thereafter the particles are applied to an article by electrostatics. Special components are a powder entraining device which uses air fed at the bottom to erode the powder, feeds additional air from above and removes entrained powder from below; a charging device using the reaction of two converging opposed vortexes to oscillate the powder turbulently through an isolated high voltage electrical zone; and a multiple valve that feeds the charged powder to a can and vents the can, then isolates the can, bypassing the powder.
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patent: 3248606 (1966-04-01), Fraser
patent: 3446642 (1969-05-01), Webb
patent: 3513011 (1970-05-01), Miller
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patent: 3922213 (1975-11-01), Smith et al.
SME Technical Paper FC 73-521 (1973), "Electrogasdynamic Powder Coating Tunnel," Meredith C. Gourdine, Gourdine Systems Inc.
Frenkel Stuart D.
McCarter Lowell H.
Parker C. Edward
Smith Ronald H.
W. R. Grace & Co.
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