Electrostatic powder coating method for the inner periphery...

Details Electrostatic powder coating method for the inner periphery... Electrostatic powder coating method for the inner periphery...

2005-05-24

2005-05-24

Parker, Fred J. (Department: 1762)

Coating processes

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

Electrostatic charge, field, or force utilized

C427S475000, C427S478000, C427S486000

Reexamination Certificate

active

06896935

ABSTRACT:
A method of forming a coating on an inner periphery of a tube with a cylindrical barrel, a mouth on one axial end of the barrel, and a shoulder located between the barrel and the mouth. The method involves holding the tube, and subsequently jetting powder into the tube from a spray gun, through a bottom side opening on the other axial end of said barrel. A first passage guides to the spray gun a first air stream together with the powder. A second passage feeds to the spray gun a second air stream with the powder. A third passage suction collects surplus powder through the tube mouth. A fourth passage suction collects surplus powder through the bottom side opening of the tube. At least one of the passages is subject to a feedback control such that flow rate and/or internal pressure therein are maintained at target levels.

REFERENCES:
patent: 3995586 (1976-12-01), Crose et al.
patent: 4987001 (1991-01-01), Knobbe et al.
patent: 5138972 (1992-08-01), Glanzmann
patent: 5362327 (1994-11-01), Sessa et al.
patent: 5739429 (1998-04-01), Schmitkons et al.
patent: 6129946 (2000-10-01), Adams

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