B - Operations – Transporting – 05 – B
Patent
B - Operations, Transporting
05
B
117/54, 32/16.7
B05B 5/00 (2006.01) B05B 5/08 (2006.01) B05B 13/02 (2006.01) B05D 1/00 (2006.01) B05D 7/14 (2006.01)
Patent
CA 1060280
A METHOD OF AND APPARATUS FOR ELECTROSTATICALLY SPRAY COATING POWDER MATERIAL ONTO METAL PIPES Abstract of the Disclosure A method of and apparatus for electrostatically spray coating powder material onto a metal pipe enable a homogenous and well-adhering coating of uniform thickness to be provided. The pipe is preheated and rotated about its longitudinal axis at constant speed, and is displaced relative to a powder spray coating device longitudinally of the pipe. Powder material is discharged onto the pipe from the spray coating device, and excess powder material is withdrawn from the coating device. For all pipe diameters, the speed of rotation of the pipe, the spacing of the coating device from the pipe and the amount of air sucked in per unit of time from the atmosphere are maintained constant, while the speed of the the relative displacement of the spray coating device and the pipe, longi- tudinally of the pipe, is varied in accordance with the pipe diameter. The powder material is sprayed with an inert gas. The coating device comprises a spray chamber in the form of a downwardly open housing adjustable in position relative to the pipe, and adapted to extend through, at most, 120° around the pipe, with the edge of the housing spaced from the pipe to define an air inlet gap. A spray gun or the like is fixed relative to the housing for discharging the powder material within the housing.
238732
Domalski Willi
Zimnik Walter
Zobl Rudolf
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