A method and the passenger compartment, for electrostatic powdering

摘要

The present invention relates to a method of creating a depression in a chamber for the electrostatic deposition of powder on objects, and of recovering the unused surplus powder in said chamber, said method comprising essentially the step of applying in alternation a suction effect and a blowing effect through one or a plurality of air-permeable inclined plates which may constitute all or part of the bottom of said chamber. The powder-recovery device comprises a fan co-operating with a three-way valve in applying the said alternate suction and blowing effects to the inclined air-permeable plates which constitute a filter to separate the particles of powder from the conveying air. The suction period is made from five to twenty times longer than the blowing period, while the blowing intensity may be equal to, greater than or less than the suction intensity. The blowing and suction effects may be applied selectively over various parts of the surfaces of the inclined filter plates, and said plates may have flat, concave or convex surfaces which may furthermore be roughened or corrugated.