| 摘要 |
SYNTHETIC RESIN BOTTLE Abstract There is disclosed a biaxially stretched, blow molded synthetic resin bottle with a bottom (5) comprising: a bottom ridge (33) disposed inward from peripheral foot (12) and formed by projecting a portion of a bottom plate downward to a position lower than a level of the peripheral foot (12) so that the bottom ridge (33) performs a function as a ground contact portion, and a central concave portion (16) formed by concaving the bottom plate upward and inward, starting from an edge of an inner sidewall of the bottom ridge (33), wherein the bottom plate ranging from the bottom ridge (33) to the central concave portion (16) performs a vacuum absorbing function as the bottom plate in this range draws upward with progress of internal depressurization, and wherein in this state, the peripheral foot (12) instead of the bottom ridge (33) is assigned to perform the function as the ground contact portion. |
