| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an injection-molded article without a bubble trace. Ž<P>SOLUTION: In an injection molding machine for molding a molding by packing a molten resin in the cavity 110 of an injection molding mold 100 after the cavity 110 is made a vacuum once, in a contact part between a sprue bush 120 communicating with the cavity 110 and an injection nozzle 130 injecting the molten resin to the sprue bush 120, the contact part is sealed with an O ring 120R by inserting the O ring 120R into a projection cylinder part 120TE at the tip of the sprue bush 120. As a result, the intrusion of outside air from the contact part is eliminated to keep a vacuum state in the cavity 110 improved, so that the molding without a bubble excellent in appearance quality can be obtained. Further, a yield is improved, working properties are improved, and a total production cost in injection molding working can be reduced. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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