| 摘要 |
PROBLEM TO BE SOLVED: To improve dimensional stability, rigidity, weather resistance and chemical resistance by high frequency induction heating a parting surface from between parting surfaces until a parting surface temperature becomes a specific range, and then injection molding. SOLUTION: A high frequency induction heater (e.g. a high frequency induction heating coil 3) is inserted from between parting surfaces in the state that a mold having a fixed side mold 1 and a movable side mold 2 is opened. The parting surface is high frequency induction heated to a range of 200 to 250 deg.C. Thereafter, the coil is drawn out, the mold is closed, a resin is filled in a cavity, and then a molding is obtained in the same step as normal step of injection molding. Since a high frequency heating range is an extremely shallow range from a surface of the parting surface, a time required to cool the resin filled in the cavity is substantially equivalent to ordinary injection molding of the polyacetal resin.
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