| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection pin capable of certainly injecting both gas and liquid without requiring a special device for injecting the liquid or a device for injecting the liquid under high pressure. SOLUTION: The injection pin 1 is equipped with a cylindrical part 11, a shaft 10 sliding in the cylindrical part 11, a piston 16 provided to the rear end of the shaft 10 and a gap forming part 15 provided to the leading end of the shaft 10. When the cavity of a mold is filled with a molten resin and gas is injected in the molten resin, the gap forming part 15 of the shaft 10 is positioned at the leading end of the first small diameter part 12 of the cylindrical part 11. Further, the opposed surface 161 of the piston 16 is brought into contact with the peripheral edge of an opening 141A of a second small diameter part 14. At the time of the injection of the liquid, the shaft 10 slides and the gap forming part 15 is protruded from the leading end of the cylindrical part 11 to release the closure of the opening 141A by the opposed surface 161 of the piston 16. COPYRIGHT: (C)2006,JPO&NCIPI
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