| 摘要 |
PURPOSE:To reduce sharply manufacturing cost of rubber valve and O-ring used for gas lighter's valve mechanism by a method wherein the valve and the O-ring are moulded concentrically as an integral unit to thereby mold them at the same time by a single step. CONSTITUTION:This process cmprises steps of molding O-ring part 6 integrally along the periphery of a rubber valve part 5 through a thin-walled part 7 and molding a thick-walled part 9 along the periphery of the O-ring part 6 through a thin-walled part 9 thereby forming an integrally molded member 10. The members 10 are integrally molded in such a manner that they are arranged in two- dimension on a plurality of sheets 11. The rubber valves 5 are removed from the central part of O-rings 6, and O-rings 6 are in turn separated from thick walled parts 9 thereby enabling the same number of rubber valves and O-rings to be obtained. This process eliminates the need for pull-out portions to be formed in the central portions of O-rings, and therefore rationalization of manufacturing process, a material saving and a cost saving can be achieved. |
