| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a good ribbed-duct which shows a stable quality even when the number of molding process steps is increased. SOLUTION: This method for manufacturing the ribbed-duct uses a pair of split halves of a mold 1, a plate body 24 which traverses the interior of a cavity C, penetrating an opening part 15 formed in the mold face 11 of one of the split halves and splits the cavity C and a cooling means 3 which cools the plate body 24 outside the mold 1 Thus a parison 5 is introduced under an open mold state, then the mold 1 is closed and the plate body 24 whose temperature is lowered by the cooling means 3 is advanced to prod a parison part 51, which, in turn, juts out to come into contact with an opposed parison part 53. After that, gas is blown into the parison 5 and at the same time, the plate body 24 is retreated to the outside of the mold 1, so that a rib 62 which splits the interior of a duct is formed simultaneously during molding a duct body 61.
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