| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent a bottle-shaped synthetic resin-made container from becoming incapable of being erected upright by remarkably suppressing an indeterminate shape change even if pressing force caused by an increase of a volume of a content is applied on the bottom of the container and the shape change is extended to the bottom of the container on the occasion that the increase of the volume in freezing the content in a filled and sealed state is absorbed by changing the shape of the container. <P>SOLUTION: A rigid body 41 recessed inward a container is provided at the center of a bottom 4, and a ground part 43 which contacts with the ground surface in approximately parallel through an inclined part 42 is concentrically formed on the periphery of the rigid body 41. When the pressing force is applied from the inside of the container to the rigid body 41, the inclined part 42 is formed so as to turn toward a virtual plane including the ground part 43 with a boundary with the ground part 43 as a fulcrum and a partial inclination is prevented from being generated on the ground part 43 by dispersing the pressing force applied to the rigid body 41. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
