| 摘要 |
PROBLEM TO BE SOLVED: To improve rigidity and heat resistance of a blow molded body by uniformly expanding foamable resin beads in the hollow molded body and fusing them together in a case when the hollow molded body with a built-in foamed body is manufactured by secondarily foaming the foamable resin beads in the hollow molded body 1 in the blow molded body or the like. SOLUTION: Holes 2 and 3 are formed in the hollow molded body 1, and a steam feeding pipe 4 and a vent pipe 6 in which a number of small holes 9 and 10 are formed are inserted into the hollow molded body 1 from the holes 2 and 3. Steam is fed into the inside of the hollow molded body 1 through the small holes 9 from the steam feeding pipe 4 and is vented to the outside through the small holes 10 from the vent pipe 6. After the secondary foaming is completed, the steam feeding pipe 4 and the vent pipe 6 are pulled out. COPYRIGHT: (C)2009,JPO&INPIT
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