Powder electro-charging device and electrostatic powder painting

Details Powder electro-charging device and electrostatic powder painting Powder electro-charging device and electrostatic powder painting

1979-08-22

1981-09-15

Saifer, Robert W.

Fluid sprinkling, spraying, and diffusing

Electrostatic type

With fluid entrainment

239105, 361227, B05B 502

Patent

active

042892783

ABSTRACT:
An electrostatic powder painting device provided with an improved powder electro-charging device is described herein, which painting device comprises a duct for conveying powder suspended in gas, an electrode chamber communicating with a slit formed along the entire inner circumference of said duct, a ring electrode disposed within said electrode chamber and having a substantially large radius of curvature in cross-section, a corona discharge electrode disposed at the center of said duct, gas introduction means into said duct through said slit, a voltage source for applying a voltage between said corona discharge electrode and said ring electrode, and means disposed in the proximity of the outlet end of said duct for regulating an ejection pattern of a powder cloud, whereby said painting device can maintain an highly excellent charging performance over a long period of time when the powder conveyed by the gas is charged with unipolar electric charge and also the most important performance of an electrostatic powder gun, i.e., a greatly enhanced transfer efficiency, penetration capability and wrapping-around capability for carrying out electrostatic powder painting.

REFERENCES:
patent: 3698635 (1972-10-01), Sickles
patent: 4011991 (1977-03-01), Masuda
patent: 4039145 (1977-08-01), Felici et al.

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