| 摘要 |
<P>PROBLEM TO BE SOLVED: To enlarge a region that can ensure sufficient fluidity, transfer properties and injection pressure of synthetic resin per injection port. Ž<P>SOLUTION: Hot steam is supplied into a heat medium passage 20 of a fixed die part 4 to heat the cavity forming face side of the fixed die part 4, and a temperature rise is started so that the cavity forming face side of the fixed die part 4 reaches a softening point temperature of synthetic resin. A fixed side assembly 1 and a movable side assembly 10 are then closed. An injection nozzle is allowed to pass through a sprue bush 6 to perform injection into a cavity S. In this case, since the cavity forming face side of the fixed die part 4 is heated to a predetermined temperature, the fluidity of synthetic resin injected into the cavity S is enhanced by this heating. Further, since a water repellent layer 21 is laminated on the cavity forming face 15A of the movable die part 15, the fluidity of synthetic resin on the cavity forming face 4A side of the fixed die part 4 and the fluidity of synthetic resin on the cavity forming face 15A side of the movable die part 15 are well-balanced. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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