Electrostatic spraying device for spraying articles with powdere

Details Electrostatic spraying device for spraying articles with powdere Electrostatic spraying device for spraying articles with powdere

1987-03-09

1988-12-06

Beck, Shrive

Coating apparatus

With means to apply electrical and/or radiant energy to work...

Electrostatic and/or electromagnetic attraction or...

239692, 239698, B05B 722

Patent

active

047889330

ABSTRACT:
A spraying device for spraying powdered material on an article includes an axially extending powder channel formed in the body of the spraying device which has an upstream region and a downstream end. The material flows out through a spraying opening located at the downstream end. A support extends from the spraying opening, upstream into the powder channel. The support defines a gas channel therein. A plurality of gas outlet orifices, located near the spraying opening, connect the gas channel to the powder channel. The orifices are inclined obliquely in the downstream direction. Electrical electrodes, connected to a high voltage, extend into the orifices and reach to or just beyond the orifices, into the powder channel. The axial distance from the tip of the electrodes to the spraying opening should be about equal to the diameter of the powder channel or according to an alternate embodiment about one half the diameter. The gas flowing past the electrodes picks up and carries electrical charges from the electrodes into the powdered material and further prevents settling of a powdered material on the electrodes.

REFERENCES:
patent: 3326182 (1967-06-01), Inoue
patent: 4289278 (1981-09-01), Itoh
patent: 4341347 (1982-07-01), DeVittorio

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