| 摘要 |
PURPOSE:To prevent a parison from being deformed and the product having uniform thickness, by providing a mandrel having an air introducing hole for introducing a gas into a parison and an expandable mechanism for expanding a parison expanding member. CONSTITUTION:The forward end 21 of a mandrel 2 is inserted into a parison 4 and after a parison expanding member 22 is expanded diametrically to expand the parison, the parison expanding member 22 is constricted. The mandrel 2 is further inserted into the expanded parison 4 to insert its neck molding member 24 into the parison 4, and splits molds 1 are closed. A gas is introduced into the parison 4 from a gas introducing hole of the mandrel 2 to mold the parison along the molding surfaces of the molds 1. |
