| 摘要 |
981,596. Coating surfaces; coated metal strips. POLYMER CORPORATION. May 8, 1961 [May 9, 1960], No. 16597/61. Headings B2B and B2E. [Also in Division D1] Aluminium and steel tubes, pipes, strips, rods and wires are coated by passing the body 32 to be coated through fluidized bed 14 and reducing the pressure on the fluidized bed while the body is being passed through it, to prevent the escape of coating material through the openings 29, 30 through which the body 32 passes. The pressure on the bed is reduced by pump 27. The body may be heated in an oven or by induction coil 31 positioned outside the bed 14 or inside the bed (Fig. 8, not shown), and may also be postheated. At the openings 29, 30 there may be additional means for preventing the escape of coating material, e.g. air jets or a sealing ring. At the exit opening cooling means may be provided. The body 32 is passed through the bed 14 by rollers 33 and may be rotated at the same time. A hopper may be connected to the fluidized bed container to replenish the coating material. The fluidization may be carried out by pump 27 with or without applying positive pressure from below plate 12. Coating material withdrawn from the top of the container may be collected and returned thereto. The coating material may comprise polyethylene, polyamides, acrylic resins, polystyrene, gilsonite, asphalt, phenol formaldehyde resins, shellac and wax. Fillers which may be present include asbestos, slate, metal and polytetrafluoroethylene.
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