| 摘要 |
PURPOSE:To prevent an airtight material from releasing at the time of mold breaking, by providing an undercut part in a charging groove of the airtight material to be provided at a position surrounding a cavity of a parting surface of a mold. CONSTITUTION:An undercut part 22 is formed in a charging groove 11 of an airtight material, in a mold provided with the groove 11 at a position surrounding a cavity 10 on a parting surface 9 of the mold 7. Then the airtight material 12 is also made into a shape capable of fitting in the undercut part 22. |
