| 摘要 |
1.168,028. Extruding reinforced hose. H. K. PORTER CO. Inc. 16 Aug., 1968 [28 Nov., 1967], No. 39421/68. Heading B5A. [Also in Division F2] Reinforced elastomeric hose is produced by extruding from an extruder A an elastomeric tube, cooling the tube by means of a cooling drum 7 and a fan 8, applying reinforcement Y, e.g. yarn, applying an outer cover O of elastomeric material from an extruder B and curing the thus formed hose in a chamber H, the extruded tubing being internally supported by gas under pressure at least until the curing step has been completed. As shown, the support gas is supplied from a blower 6 and the reinforcement from lappers 10, which preferably operate successively rather than concurrently. A flash heater 11 employing hot air is situated immediately upstream of extruder B and the latter is provided with vacuum means 16 to remove any volatile matter likely to be trapped by cover O. Chamber H comprises solid particles 32, Fig. 3, e.g. glass beads 0À1-0À2 mm. in diameter, which are heated by units 33 and are agitated by, e.g. air or superheated steam, which passes through porous tiles T from a supply conduit 31. The tube may pass one or more times through the fluidized bed of particles 32. Brushes 26 remove any particles adhering to the tube and are arranged to perform a planetary motion about the tube, Fig. 4 (not shown). In modifications, circular knitting machines or braiders may be used instead of lappers 10, an accumulator may be provided immediately downstream of the reinforcing station and this station and extruder B may be duplicated to give multi-ply hose. |
