Yoshino Kogyosho Co., Ltd.

Yuko Onoda

Hiroaki Sugiura

Takao Iizuka

Shinji Shimada

Tomoyuki Ozawa

Tadayori Nakayama

Shigeru Tomiyama

Fuminori Tanaka

Tsutomu Asari

The technical problem of this invention is to eliminate the need to use deformable panel walls and to find the body of a shape that no false deformation, such as dented deformation, takes place in a portion of the body due to the hot filling of the contents or the reduced pressure created by the treatment of retort-packed foods. The object of this invention is to obtain a bottle that can inhibit the deformation caused by reduced pressure, has a high buckling strength, and is good in outer appearance. As the solution, there is provided a biaxially drawn, blow-molded bottle made of a synthetic resin, in which the surface rigidity of the wall of body is set in such a manner that a part of the body wall cannot become dented inward under a reduced inner pressure of at least 350 mmHg (46.7 kPa).

Synthetic resin bottle with circumferential ribs for increased surface rigidity

The present invention relates to a saturated polyester resin bottle made thin by biaxial orientation and comprising a trunk portion formed to have a regular polygonal cross section consisting of a plurality of generally upright flat sides separated by vertically oriented ribs. When the interior of the bottle is subjected to a vacuum, the flat sides uniformly warp radially inwardly to accommodate the vacuum without detracting from the appearance of the bottle.

Saturated polyester resin bottle

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Ibaraki, Japan

Yuko Onoda