| 摘要 |
<p>PURPOSE:To provide a plastic blow-molded container the bottom part of which is not deformed, and which can maintain a favorable self-standing property even when the internal pressure of the container rises or even under a high temperature exceeding a normal temperature. CONSTITUTION:The subject container substantially has a cylindrical body 13, bottom part 14, and flange 11 which constitutes an opening, and the bottom part 14 consists of a central recessed part 18 and an annular heel part 17 which surrounds the central recessed part 18. On a container wall surface at the central recessed part 18, a plurality of polygonal pyramid shaped recessed parts, of which the vertexes face inward, are formed in such a manner that they are continuously arranged annularly such as surrounding the central part of the central recessed part while sharing a part of the ridges, and an outer wall surface 16 of the heel part is a conical curved surface of which the diameter becomes smaller as it becomes lower.</p> |
