Electrostatic powder spray coating method

Details Electrostatic powder spray coating method Electrostatic powder spray coating method

1997-06-03

1999-07-27

Beck, Shrive

Coating processes

Direct application of electrical, magnetic, wave, or...

Electrostatic charge, field, or force utilized

427477, 427485, 427486, B05D 104

Patent

active

059287314

ABSTRACT:
A high voltage generated by a high voltage generator is applied to corona electrodes, and powder supplied from a powder flow passage collides against a diffuser main body while being moved in a vortex by air ejected from a vortex air introduction port and is ejected from a nozzle opening. After the powder is charged by ions generated by corona discharge, it is sprayed to an object to be coated. Free ions generated by the corona discharge are trapped by ion trap electrodes. The adhesion of the powder can be prevented by the ejection of compressed air through a diffuser front portion cover and an outer cylinder cover each composed of a porous member and the ejection of compressed air from a nozzle hole.

REFERENCES:
patent: 3608823 (1971-09-01), Buscher
patent: 3996410 (1976-12-01), Gruetzman
patent: 4170074 (1979-10-01), Heckman et al.
patent: 4774102 (1988-09-01), Kiefer et al.
patent: 5582347 (1996-12-01), Knobbe et al.

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