| 摘要 |
PROBLEM TO BE SOLVED: To ensure the seal of a clearance of an ejector pin in a seal mold used for the injection molding of a thermoplastic resin in which gas is supplied into a cavity. SOLUTION: A ring-shaped recessed packing 7 having a ring-shaped recessed part 9 on one surface in which an inside fringe part on the recessed part 9 side is slightly lower than the outside fringe part is placed in a recessed part 11 with its ring-shaped recessed part 9 side turned to the cavity 3 side, and an ejector pin 6 is engaged with the inner circumferential side of the packing 7 to penetrate the packing 7. The packing 7 which facilitates the engagement of the ejector pin 6 with the seal of a clearance around the ejector pin 6 and is resistant to a twist is used. In this way, the damage of a seal member when the ejector pin 6 is inserted and a defective seal caused by a twist can be prevented. |
