SQUARE PLASTIC BOTTLE

摘要

PROBLEM TO BE SOLVED: To provide a square plastic PET bottle where the generation of a sink mark is prevented by improving the outer shape of the bottle. SOLUTION: This relates to a square biaxially stretched blow molded plastic bottle container whose bottle body part is structured with four panel faces 11a-11d and corner faces 12a-12d. On the corner faces 12a-12d and their extensions, recesses 18a-18c with a laterally long opening part for preventing sink marks are formed at least on one spot on or near the position where sink mark forming power is acted in molding.