| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a hose showing excellence in dimensional stability and a product quality by adding sufficient pressure to an unvulcanized rubber layer with a coated layer of a molding resin and preventing foaming in manufacturing the hose by plastic mold vulcanization. SOLUTION: A polyketone resin is used for a molding resin in the manufacturing method of the hose, the method comprising the steps of extruding the unvulcanized rubber so that it surrounds the outer circumference of a mandrel, extruding a coated layer of the molding resin so that it surrounds the outer circumference of the unvulcanized rubber layer, and then vulcanizing the unvulcanized rubber. Since the polyketone resin shows excellent thermal shrinkage in the vulcanization temperature range, when the polyketone resin is used for the molding resin, it is possible to manufacture the hose showing excellence in dimensional stability and the product quality by adding sufficient pressure to the unvulcanized rubber layer with the coated layer of the molding resin and preventing foaming during vulcanization without a complicated control of a vulcanization condition, a vulcanization process, a rubber compounding composition and the like. COPYRIGHT: (C)2007,JPO&INPIT |
