| 摘要 |
PROBLEM TO BE SOLVED: To provide a blow molding machine for easily decreasing a partial thickness reduction in the case of molding a blow molding with different blow-up ratio, and a method for blow molding it. SOLUTION: In the blow molding machine comprising a pre-pinch means and a blowing mold disposed under a die head 3, an oblique angle of a pinch bar moving direction from a horizontal plane when a parison 2 is pinched from right and left by pinch bars 5a, 5b oppositely movable in the pre-pinch means can be regulated to arbitrary + and - angles. And, two times of pinching having different oblique angles from the horizontal plane in pinch bars 5a, 5b moving directions are executed while urging the parison 2, part of the parison 2 between two positions of pre-pinching is held in a cavity of the mold and blown. Accordingly, a hollow molding of a thin substantially rectangular parallelepiped shape of box-like state is easily molded. |
