| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems in the process of driving air away in a cavity that it is necessary to send nitrogen gas instantaneously in a large volume causing adiabatic expansion and resulting in cooling inside the cavity which affects fluidity of the molten resin, and further causing a backflow of the resin into a hole for feeding the nitrogen gas and resulting in leaving a mark of the hole on the molded article and deteriorating appearance so that adjustment work is necessary. SOLUTION: When the molten resin is injected into the cavity 60 sandwiched between a fixed mold 40 and a movable mold 50 from a sprue 70 via a gate 79, the nitrogen gas to be sent into the cavity 60 is heated in advance during the process of sending it. COPYRIGHT: (C)2009,JPO&INPIT
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