| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow molding duct not having a fault even when a trace of extracting of a blowing pin remains and a method for suitably molding the duct. SOLUTION: The blowing pin 28 is opposed to a site to be formed with a parting line for laminating both edges 12a, 14a of two long-sized sheet materials 12, 14 in a longitudinal direction in a hollow duct 10. After a blowing gas is forcibly blown from the pin 28, the materials 12, 14 are blow molded in a required shape. Then, the materials are blow molded by drawing the pin 28. Thus, air releasing is prevented by executing a closing means 32 at an inserting part 30 formed at the parting line PL by the pin 28.
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