Toyo Seikan Kaisha, Ltd.

Toyo Seikan Co., Ltd.

Toyo Seikan Group Holdings, Ltd.

Atsushi Komiya

Ryouta Ishii

Hiroyuki Honda

Akihiko Morofuji

Toshiki Sakaguchi

Takuya Fujikawa

Takeshi Uchiyama

Hiroki Yasukawa

Rika Nagaharu

Ryota Ishii

Yuki Satoh

Yuu Yamazaki

Koki Okabe

Yuuki Kurihara

Takahiro Ookubo

Yuuki Satou

Masashi Fujioka

Hiroyuki Kondo

Synthetic resin bottle () including tube-shaped body section () comprises eight decompression absorbing panels () disposed at equal intervals in body section () and pillar sections () respectively disposed between said decompression absorbing panels () and formed by arcuate wall surfaces (). Arcuate wall surfaces () of pillar sections () in a cross section of body section () configure parts of one imaginary perfect circle (). A total of circumferential lengths of arcuate wall surfaces () of pillar sections () is 20 to 50% of a total circumferential length of perfect circle (). Consequently, it is possible to realize the synthetic resin bottle having decompression absorbing performance in order to absorb a decrease in internal pressure, the exterior of the body section of the synthetic resin bottle being seen as a cylindrical shape whose shape is almost the same as that of a perfect circle.

Synthetic resin bottle

A stretch-blow-formed polyester container having an average thickness of not more than 280 &#x3bc;m in the body portion thereof, and effectively suppressing the deformation that is caused when the container is filled with a content of a high temperature, wherein in the measurement of dynamic viscoelastic properties in an axial direction at a central portion of said body portion, a tan &#x3b4; peak value and a tan &#x3b4; peak temperature at the peak value satisfy either; (i) the tan &#x3b4; peak value is in a range of 0.23 to 0.29, and the tan &#x3b4; peak temperature at the peak value is in a range of 111 to 118&#xb0; C.&#x3b4;; or (ii) the tan &#x3b4; peak value is in a range of less than 0.25, and the tan &#x3b4; peak temperature at the peak value is in a range of not lower than 119&#xb0; C.

Stretch-blow formed polyester container and method of producing the same

A process for producing a heat- and pressure-resistant polyester bottle, comprising a primary blow-molding step of obtaining a primary molded article by biaxially stretch-blow-molding a preform of a polyester resin, a heat-treating step of obtaining a secondary molded article that is heat-shrunk by heat-treating the primary molded article, and a secondary blow-molding step of obtaining a finally molded article by biaxially stretch-blow-molding the secondary molded article, wherein the primary blow-molding step biaxially stretches the neck portion of the primary molded article to a size nearly the same as the neck portion of the finally molded article, and the heat-treating step does not cause the neck portion of the secondary molded article to be heat-shrunk. The heat- and pressure-resistant polyester bottle has a slender neck portion of the shape of a so-called crane neck and is suited for containing beer without eradicating the impression of the traditional glass-bottled beer, wherein the length of the neck portion is in a range of 10 to 40% of the height of the bottle, the crystallinity of the neck portion is in a range of 20 to 35%, and the crystallinity of the body portion is in a range of 35 to 50%.

Heat- and pressure-resistant polyester bottle and process for producing the same

The invention realizes easy manufacturing of a flat container molded by blow molding, in which the wall thickness of a container wall is made uniform, and which provides improved mechanical strength, heat resistance, etc. and has a good appearance. The flat container obtained by the blow molding of a polyester resin is characterized in that the container has a flatness ratio of not less than 1.3, and in that its body has a wall thickness ratio of a maximum wall thickness to a minimum wall thickness of not more than 1.6, a difference in elongation between a maximally stretched portion and a minimally stretched portion of not more than 150% in a tensile test at 95&#xb0; C., a crystallinity of not less than 30%, and a difference in TMA non-load change between a maximally stretched portion and a minimally stretched portion of not more than 500 &#x3bc;m at 75&#xb0; C. and 100&#xb0; C.

Flat container comprising thermoplastic resin and method for molding the same

To provide a thermoplastic resin container that contains food or drink subjected to a retort processing for which completion of the retort processing can be confirmed and supervised with simple means without the need of an expensive member or facility, not only whether the temperature of the retort processing is reached but also whether the retort processing is performed as specified can be confirmed, and the consumer also can easily confirm completion of the retort processing of the product. The container is produced by two-stage stretch blow molding of a preform made of a thermoplastic resin in such a manner a part that is not stretched or is insufficiently stretched is formed at a part of the container, and the part that is not stretched or is insufficiently stretched is whitened to form a retort processing completion confirming part by heating in the retort processing after a content is packed and sealed in the container.

Thermoplastic resin container for which completion of retort processing can be confirmed and method for producing the same

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Yokohama, Japan

Atsushi Komiya