| 摘要 |
1487195 Fluidised bed coating apparatus ELECTROSTATIC EQUIPMENT CORP 5 Sept 1974 [18 Sept 1973] 38877/74 Heading B2L [Also in Division D1] In an electrostatic fluidised bed apparatus in which a porous support 182 (Fig. 5) separates a bed of particles from a plenum, fluidising gas is ionised by an electrode spaced from the support 182 before passing through the support 182 to fluidise the bed and charge the particles. Preferably the electrode 170 comprises a mass of steel wool or woven flat metal strip and a baffle 178 is provided to increase the gas path length from the electrode 170 to the support 182. In Fig. 5 the charged particles passing through a discharge slot 166 are deflected by a flap 168 onto a desired part of an earthed workpiece 188. In Fig. 2 the fluidised bed is divided into two by walls 72 defining a passage through which elongated workpieces 100, which may be rotated, are passed. The tops 98 of the walls 72 slope downwards in the direction of travel of the workpieces to coat them uniformly and excess powder is sucked out of an opening 104. In Fig. 4 (not shown) an earthed wire (132) is passed through a hollow insulator (126) into the fluidised bed, the ioniser (120) being disposed in air supply passages (118) leading to the plenum.
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