| 摘要 |
PROBLEM TO BE SOLVED: To provide a mandrel used when an unvulcanized hose is molded in order to manufacture a bent composite hose and capable of easily demolding the unvulacnized hose without semi-vulcanizing the same even if the reinforcing yarn layer of the unvulcanized hose is braided under high blade tension. SOLUTION: This mandrel comprises a rubber pipe 1 and one end of the rubber pipe 1 is hermetically closed by a blind plug 3 while a joint 4 having a communication hole communicating with the open air from the hollow part 1a in the rubber pipe 1 is attached to the other end of the rubber pipe 1 so as to connect a vacuum pump 2. By this constitution, after the unvulcanized hose is formed on the outer peripheral surface of the mandrel, the rubber pipe 1 is collapsed by evacuating the hollow part 1a by the vacuum pump 2 to easily demold the unvulcanized hose. COPYRIGHT: (C)2005,JPO&NCIPI |
