Yoshino Kogyosho Co., Ltd.

Naoki Tsutsui

Toshimasa Tanaka

Takao Iizuka

Hiroshi Hosokoshiyama

Tomoyuki Ozawa

Daisuke Uesugi

Hiromichi Saito

Shigeru Tomiyama

Shoji Tanabe

Toyoji Kato

Koji Itou

Tomohiko Ishizuka

Hiromi Yaguchi

Naoto Hara

K Itou

H Hosokoshiyama

Takao Iiduka

The synthetic resin container according to the present invention has a waist dividing a container main body portion into upper and lower parts, wherein the waist is formed on an annular groove surrounding the main body portion to as to be convex toward the interior of the container. The annular groove has reinforcing ribs with a level higher than a groove bottom of the annular groove and lower than the surface of the main body portion. The container main body portion includes reinforcing lateral ribs each having a concave portion which is positioned at the same level as a surface of the container, which or forms a slight step relative to the surface of the container. The main body portion has a plurality of ridges converging toward the associated central convergent point, respectively, thereby defining multi-faceted concave walls inclined toward the associated convergent points, respectively.

Synthetic resin container having improved shape stability

It is intended to provide a synthetic resin bottle, in which the stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned. The bodyof the synthetic resin bottle is configured to have a smooth seal surfacewith no irregularity over the entire circumference in the upper portion of the outer neck wall where no parting line is formed. In this configuration, a stable no-leak condition can be maintained up to a certain cap-turning angle, and air-tightness of the bottle can be fully secured, even if the cap is falsely turned.

Container main body made of synthetic resin and preforming mold device

A bottle-shaped container according to the present invention includes a mouth portion () for discharging contents, a shoulder portion (), a main body portion (), and a bottom portion (), wherein these portions are integrally molded and successively arranged with each other. An annular projection () surrounds the main body portion () and protrudes from a surface thereof, along a boundary between the shoulder portion () and the main body portion (). Further, narrow grooves () are provided on both sides of the annular projection () to extend along the same, respectively.

Bottle-shaped container including an annular projection

In a bottle-shaped synthetic resin container having a body part of substantially rectangular tubular shape, groove ribs, having a comparatively wide vertical groove form, are depressingly provided at the centers in the width direction of flat wall portions of shoulder lower end parts, which are portions of a shoulder part that connect with the body part, to make these portions higher in rigidity and difficult to deform and, even when a deformation occurs, prevent the deformation from becoming a permanent deformation. Safe handling of the container is thus promoted, especially for the stacked storage of containers in a sideways-laid orientation.

Synthetic resin container having a rectangular tubular shape

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Tokyo, Japan

Naoki Tsutsui