| 摘要 |
PROBLEM TO BE SOLVED: To increase the decompression absorbing capacity while suppressing the generation of bottom deformation.SOLUTION: The bottom wall section 19 of the bottom section 14 includes: a ground contact section 18 located on the outer peripheral edge section; a standing peripheral wall section 21 connected with the ground contact section 18 from the inside in a diametrical direction of the bottle, and extends upward; an annular movable wall section 22 protruding inward in a diametrical direction of the bottle from the upper end part of the standing peripheral wall section 21; and a sunk peripheral wall section 23 extending upward from the internal end part in the diametrical direction of the bottle of the annular movable wall section 22. The annular movable wall section 22 includes: an external wall section 35 freely turnably arranged with the connected section with the standing peripheral wall section 21 as the pivot in a manner to move the sunk peripheral wall section 23 upward, and at the same time, extending gradually downward as coming closer to the inside in the diametrical direction of the bottle from the upper end part of the standing peripheral wall section 21; and an internal wall section 36 connecting the external wall section 35 with the sunk peripheral wall section 23, and also, formed into a concave curved surface shape recessed upward. |
