Importance

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Abstract

A thermal effect from a bottom cutoff portion of parison is dispersed and reduced by forming at least three pinch-off lines in an outer surface of a bottom and laying out these pinch-off lines radially from a center of the bottom of a bottle-like direct blow molded product made of a synthetic resin, which prevents a deeply dented portion from developing in an inner bottom surface. In the case of a square body, four pinch-off lines are disposed in the shape of a cross and are positioned along diagonal lines on the bottom surface and one of the diagonal lines is located on the parting line. Each outermost end of the pinch-off line is placed near bottom foot where parison walls are locally drawn and molded, which reduces the drawing rate at the foot to prevent the walls from getting extremely thin.

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First Claim