| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bottle configured to exhibit decompression absorbing function through depression deformation involving the inversion deformation of the depressed part of a bottom, the bottle having a bottom wall structure that can sufficiently be restored from a depressed and deformed state caused by the decompression. <P>SOLUTION: In the synthetic resin bottle formed by bi-axially blow molding, the surface of its bottom has a depressed portion formed by depressing a bottom wall in the direction of the inside of the bottle so that when the bottle is decompressed, the bottle is depressed and deformed in the direction of the inside of the bottle, having as a basal end the internal circumferential end of a grounding part, which is circularly formed on a peripheral edge. The depressed portion includes: a depressed peripheral wall portion extending upward on the peripheral edge from near the inner circumferential edge of the grounding portion; a depressed recess, formed by depressing the middle in the shape of a dome; and an inverting wall in the shape of a flat plate ring, which connects the upper end of the depressed peripheral wall and the basal end of the depressed recess and is formed so as to be deformable by its being inverted. In addition, the portion connecting the upper end and inverted wall of the depressed peripheral wall has a peripheral rib wall exhibiting the function of a peripheral rib. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
