| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that time is required in the venting of blow gas heretofore when a resin is injected in the edge of a plate-shaped objected and molded into a hollow state by a blow molding method and production efficiency is bad. SOLUTION: The resin is injected in ST02 of a drawing (a) and blow gas is injected in ST03 and a gas injection pipe is subsequently drawn out in ST05 to discharge the blow gas. A drawing (b) is a comparing example and, since gas must be discharged in ST106 heretofore through a long flow channel having a small diameter, time is required in the discharge of the gas but, since the gas is vented in ST05 before mold opening in ST06 in the embodiment of the drawing (a), time is shortened byΔTime. By this constitution, productivity can be enhanced.
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