| 摘要 |
PURPOSE:To obtain a molded article superior in quality by making ventilation from a cavity reliable, by a method wherein double sealing rings are made to interpose in mating faces of molding dies, setting resin is poured in by making a space between an inner circumferential ring and an outer circumferential ring into negative pressure. CONSTITUTION:Double seal rings 14, 15 are interposed in mating faces of external circumferences of a male die 11 and a female die 12, an intermediary 16 which is permeable to air and not to resinous content is provided among the ring 14 and the dies 11, 12 and an air vent hole 17 opening in a space 18 between the rings 14, 15 is provided. The space 18 is turned into negative pressure by ventilating air through the hole 17, air in a cavity 13 formed between the dies 11, 12 is ventilated outside through a gap of the intermediary 16, and after turning pressure of the inside of the cavity 13 into negative pressure of about 0.3-0.7kg/cm<2>G molding is performed by puring setting resin 20 through a pouring opening 19. With this construction, a molded article having no pinhole can be obtained as ventilation is performed extending over the whole of an external circumference of the cavity. |
