| 摘要 |
PROBLEM TO BE SOLVED: To suppress non-uniformity of wall thickness at a time of blow molding to uniformize the wall thickness of a molded product as a whole. SOLUTION: When blow molding is performed by performing mold clamping, deformation is applied to a parison to almost simultaneously perform the contact of the parison 1 with the inner surface of a mold 5 as a whole. Preforming is applied to the parison 1 prior to blow molding so as to become approximate to a molded product and the non-uniformity of wall thickness at a time of blow molding is suppressed and the wall thickness of a molded product is uniformized as a whole. |
