| 摘要 |
<P>PROBLEM TO BE SOLVED: To mold not so as to leave any burr in a molding and not so as to make any rough surface through a separation surface of a synthetic resin is glossy. Ž<P>SOLUTION: In a method of injection molding, after the cavity-forming surface side of a fixed mold 6 and a gate cut member 17 are heated by supplying a medium for heating into heat medium passages 35, 36, the melted synthetic resin is injected in the cavity S, and an injection pressure is kept to increase the pressed density of the synthetic resin after the injection. The power in which the synthetic resin tends to come out from the cavity is added to the gate cut member 17 by separating the synthetic resin in a gate 13 from the synthetic resin in the cavity S by operating the gate cut member 17 immediately before or immediately after the flow of the injected synthetic resin stops. After the separation, the synthetic resins in the cavity forming surface side of the fixed mold 6 and in the gate 13 are cooled by the supply of a medium for cooling into the heat medium passage 35, 36, and are taken out when they become solidified to the extent in which they can be taken out from the fixed mold 6 and a movable mold 26. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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