| 摘要 |
1522097 Powder coating tubing METALLGESELLSCHAFT AG 24 Sept 1976 [25 Sept 1975] 39868/76 Heading D1L Metal tubing is coated with plastics powder by passage in heated condition through a tube 3 extending within a chamber 19 of fluidised powder, the tube 3 having an annular slot 8, 8a therein through which powder is drawn by suction applied upstream thereof at 5. The annular slot, as shown in Fig. 3, may include a funnel-shaped inlet portion substanding an angle of 30-60‹ with the tube 3 and having a length of 40-80mm. The coated tube is subsequently levelled in hot oil and cooled in cold oil. |
