| 摘要 |
PROBLEM TO BE SOLVED: To form a resin molding which is free from surface distortion, a flow mark, a weld mark, a sink, and warpage and good in appearance in a short production time even when it is relatively thick. SOLUTION: The resin molding 11 is divided into two parts 12 and 13, and the parts 12 and 13 are formed from the same thermoplastic resin (PMMA) having translucency. First, a movable mold and a first fixed mold are kept at a temperature of at least the load distortion temperature and below heat decomposition temperature of PMMA, and PMMA is injected into a first cavity formed by both molds to form a first part 12. After the movable mold 9 and the first fixed mold 4 are cooled, a second cavity is formed by the movable mold holding the first part and a second fixed mold. The movable mold is kept at a low temperature. While the temperature of the second fixed mold is again raised to be at least the load distortion temperature and below heat decomposition temperature of PMMA, PMMA is injected into the second cavity to form a second part 13. COPYRIGHT: (C)2009,JPO&INPIT
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