| 摘要 |
<p>1,066,490. Extruding plastics. A. STOEHR. Dec. 6, 1963 [Dec. 24, 1962], No. 48232/63. Heading B5A. Profiled lengths of polyethylene, used for making transmission belts, sieves, sieve drums, grids, floor coverings, door mats, roller blinds, netlike hoses, insulating tubes and vacuum cleaner hoses, are produced by extrusion from a conventionally heated extruder 1, followed by incision of the extruded length from opposed directions by reciprocating blades 7, 8, mounted at the die 5, with simultaneous straining in the direction of extrusion caused by draw-off rollers 9, 10. The profiled length is then cooled in a water bath in the zone 14 and cut into lengths by the rotating knife 16. In a modification a tube (34, Fig. 6) is extruded from extruder (36) and cut on its inside and outside by oppositely rotating blades (38, 37 respectively). Tubular network structures are produced by cutting the extruded tube with sets of radially overlapping blades (57, 60, Fig. 9) rotating in opposed directions.</p> |
