| 摘要 |
The present invention relates to an injection molding apparatus for producing video discs, compact discs, etc. Most particularly, the present invention provides an injection molding apparatus for producing the discs mentioned above in which when a punch severs an aperture in the disc while in the mold halves and not solidified, a sprue bushing is arranged to retreat while a resisting force is applied to the sprue bushing against the urging force of the punch.
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