Powder spray apparatus and method for coating threaded articles

Details Powder spray apparatus and method for coating threaded articles Powder spray apparatus and method for coating threaded articles

1996-10-10

1998-08-11

Beck, Shrive

Coating processes

Solid particles or fibers applied

Interior or hollow article coating

427183, 427195, 427236, B05D 102, B05D 722, B05D 302

Patent

active

057925127

ABSTRACT:
A powder spray apparatus for coating threaded fasteners capable of operating at an optimum spray condition. Air supply and powder supply tubes communicate within an air/powder entrainment block. The jet diameter of the air supply tube is sized to provide an optimum spray condition at which a constant supply of powder is provided through a powder spray tube at an optimum powder density and velocity. These powder density and velocity conditions maximize the powder build rate on the threads of the fastener, and also increase production rates. The resulting coated fasteners exhibit a low torque scatter, and a highly uniform patch. A method for operating a powder spray apparatus at the optimum spray condition also forms part of the present invention.

REFERENCES:
patent: 3995074 (1976-11-01), Duffy et al.
patent: 5221170 (1993-06-01), Duffy et al.
patent: 5262197 (1993-11-01), Pollizzi
patent: 5356254 (1994-10-01), DiMaio et al.

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