Coating apparatus – With means to apply electrical and/or radiant energy to work... – Electrostatic and/or electromagnetic attraction or...
Patent
1987-06-11
1988-10-25
Lawrence, Evan
Coating apparatus
With means to apply electrical and/or radiant energy to work...
Electrostatic and/or electromagnetic attraction or...
118629, 118630, 118633, 239706, B05B 502
Patent
active
047795646
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 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.
Creech Ronald G.
Hart Stephen
Kiefer Steven L.
Lawrence Evan
Morton Thiokol Inc.
White Gerald K.
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