Method of electrostatic powder spray coating

Details Method of electrostatic powder spray coating Method of electrostatic powder spray coating

1986-06-09

1988-09-27

Lawrence, Evan K.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

239 3, 427 28, 427 29, B05D 106

Patent

active

047741023

ABSTRACT:
An electrostatic powder spray coating method and apparatus for producing evenly coated continuous films of thermoplastic and thermosetting powders on substrates or parts having electrically conductive geometric complex surfaces and enables the use, without the occurrence of "cobwebbing," of significantly higher charging voltages for the spray gun in the spray coating of preheated substrates and parts, thus allowing faster coating lines. The invention features the use of a grounded electrically conductive ring for grounding the ionized field in the powder discharge region of the spray gun.

REFERENCES:
patent: 2773472 (1956-12-01), Lamm
patent: 3336903 (1967-08-01), Point
patent: 3687705 (1972-08-01), Kilbane
patent: 4009829 (1977-03-01), Sickles
patent: 4228961 (1980-10-01), Itoh
patent: 4297386 (1981-10-01), Gillette
patent: 4343828 (1982-08-01), Smead et al.

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