BIAXIALLY STRETCH-BLOW MOLDED LIGHTWEIGHT SYNTHETIC RESIN BOTTLE CONTAINER AND METHOD FOR PRODUCTION THEREOF

摘要

A bottle-shaped container shows a large critical strength against buckling and is made of a reduced amount of synthetic resin material. A manufacturing method can manufacture such a bottle-shaped container. A lightweight bottle-shaped container made of synthetic resin and formed by biaxially-oriented blow-molding, characterized in that a wall thickness is increased to 109% or more of an average wall thickness of blow-molded part of the wall at an inflection point (121, 122, 143-145, 164-167, 243-245, 264-267, 271-274, 283, 284, 343-345, 371-374, 391-394) between a portion having a transversal cross sectional area and a portion having a different transversal cross sectional area in a cylindrical wall. The wall is thicker between the heel (14, 24, 34) and the bottom (15, 25, 35), or at the waist (16, 26), at the recessed rib (27, 37, 39), or at the projection (28).