Electrostatic paint deposition method and apparatus

Details Electrostatic paint deposition method and apparatus Electrostatic paint deposition method and apparatus

B - Operations, Transporting

05

B

B05B 5/04 (2006.01) B05B 5/025 (2006.01) B05B 5/053 (2006.01) B05D 1/04 (2006.01)

Patent

CA 2046109

ABSTRACT An enhanced electrostatic paint deposition apparatus (10) comprising a nozzle (16), a conduit (14) coupled to the nozzle for supplying paint (12) thereto, and a plurality of electrically conductive whiskers (18) positioned within the nozzle for applying an electrostatic charge to droplets of the paint. Each of the whiskers terminates in a jagged end (30) for enabling the droplets to acquire an enhanced electric charge. The whiskers may be provided with lengths which are tailored to provide an array of whiskers with a desired three-dimensional curvature for controlling the focussing field on the paint droplets. Each whisker is secured to a holder (22) which is, in turn, secured to a porous grid (28) whose mesh size is selected to divide the paint into narrow streams of desired size, which exit nozzle 16 in droplet form. The holder is configured by decreasing its center portion (28) in dimension to tune the holder's current limiting capabilities. Pulsed negative high voltage is applied to the whiskers for enabling them to negatively charge the paint. Phased deflector plates 22, 24, 26 are provided to steer the paint stream.

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