| 摘要 |
PURPOSE:To install optional parts securely even to a thin wall molded product by putting the thin wall hollow molded product with an open upper section in a secondary processing mold having a cavity same as a blow mold of the product and having a secondary molding recessed section partly on the cavity peripheral surface and injection welding molten resin under a given condition. CONSTITUTION:A thin wall container 15 is retained by a neck mold 6 and set in the center of a secondary processing mold 16 in the mold closed state. The thin wall container 15 is held in the mold together with the neck mold 6 by mold closing, and further an air force fitting core 19 is inserted into said neck mold 6 and high pressure compressed air is force fitted into the inside of the thin wall container 15. The thin wall container 15 is expanded by said force fitting and brought into contact with the cavity surface, and a part of the same keeps the secondary molding recessed section 22 from opening, while internal pressure is maintained higher than the injection pressure at the time of secondary injection molding to turn the container into an injection core. After that, when molten resin is injected from a secondary injection device 18 into a secondary molding recessed section 22 using the thin wall container 15 as the injection core, a base cup 22a is molded integrally on the bottom surface of the thin wall container 15. |
