| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow the deformation of a vessel through negative pressure to generate at a predetermined place as a starting point, and prevent the occurrence of an appearance failure through uniform deformation of the vessel entirety by providing grooves on a wall surface for partitioning each recessed part in an angular sleeve-like plastic vessel having at least two recessed parts on the peripheral wall. SOLUTION: A vessel body 2 includes a mouth part 10 and flange 11 at its upper part, and the peripheral wall of its lower part is formed into a quadrangle in its cross-section. Namely, the peripheral wall 3 has four wall surface parts 4, and chamfered parts 12 are made between these wall surface parts 4. Furthermore, recessed parts 13, 14 for absorbing decompression are provided on each wall surface part 4. In this instance, two pieces of groove parts 5 are formed on the wall surface parts in order to connect these parts. By such a constitution, the entirety of the recessed parts 13, 14 is permitted to deflect to the side of a content 51 during decompression in the inner part of the vessel body 2 in such a state that the mouth part 10 of the vessel body 2 is sealed by the lid, so that the entirety of the peripheral wall 3 is deformed, resulting in the prevention of an appearance failure by uniformly deforming each wall surface parts 4.</p> |
