Toyo Seikan Kaisha, Ltd.

Toyo Seikan Group Holdings, Ltd.

Kazushi Matsukiyo

Masaki Miura

Yuuta Murayama

A synthetic resin container, in which the bottom parthaving a bottom plate partwhich is present at the center of the bottom part and a peripheral partwhich is positioned at the periphery of the bottom plate part, in the peripheral part, a grounding parthaving an inside slopewhich rises outwardly of the container with the outer peripheral edge of the bottom plate partbeing the start point and an outside slopewhich continues to the side surface of the bottom partis formed, and when a load is applied in the axial direction in the state where the container stands upright on the grounding surface G, the shape of the bottom partchanges reversibly such that the bottom plate partis depressed inwardly to the container. As a result, it is possible to avoid deformation of a container into an unintended shape by buckling or the like even if a load is applied to a container in the axial direction, and to ensure the rigidity of a container against a load in the axial direction.

Synthetic resin container

A synthetic resin container with a bottom structure in which forms, in the bottom portion thereof, an outer circumferential wall that is continuing from the body portion, an annular leg portion inclusive of a grounding portion and an inner circumferential wall, and a raised bottom portion positioned over the grounding portion on the inside of the inner circumferential wall of the leg portion. The raised bottom portion protrudes downward beyond the root portion where the leg portion is continues to the inner circumferential wall, a plurality of arcuate protuberances are formed in a spiral shape heading from the outer edge of the central portion of the raised bottom portion toward the outer circumferential side, and arcuate dents are formed among the arcuate protuberances that neighbor each other.

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Yokohama, Japan

Kazushi Matsukiyo