B - Operations – Transporting – 64 – D
Patent
B - Operations, Transporting
64
D
117/54, 299/7, 3
B64D 1/18 (2006.01) B05B 5/047 (2006.01)
Patent
CA 1039125
ABSTRACT A method and apparatus are provided for the electrostatic deposition of solid particles or liquid droplets on to an earthed surface. The method involves in the vicinity of the surface to be treated directing a flow of gas carrying electrically charged particulate material adjacent a capacitor surface which has been charged to a high potential by the transference of electric charges developed on another particulate material which is being transported round a closed circuit path including a charging region remote from where the charge is transferred to the capacitor. Charging of both particulate materials is preferably by triboelectricity although corona discharge may also be used. Apparatus comprises tubing forming a closed loop, a compressor for circulating airborne powder round the loop, a corona discharge needle projecting through an insulated portion of the tubing wall and electrically connected to a toroidal capacitor surrounding said insulated portion and a barrel associated with a second compressor for projecting a separate supply of airborne powder adjacent the capacitor surface. The invention is particularly suitable for crop spraying or dusting or the electrostatic coating of products e.g. with plastics, and represents a more efficient and thus improved method over known processes.
213555
Imperial Chemical Industries Limited
Na
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