Synthetic resin container

Abstract

The invention provides a synthetic resin container. The container is provided with a bottom (4) having a bottom plate (41) located at the center of the bottom, and also having a peripheral edge (42) located around the bottom plate (41). At the peripheral edge (42) is formed a ground contact section (422) having an inner slope surface (422a) rising outward from the container from the outer peripheral edge of the bottom plate (41) and also having an outer slope surface (422b) continuing to a side face of the bottom (4). The shape of the bottom (4) is adapted to be reversibly changeable so that the bottom plate (41) is depressed inward when a load is applied to the container with the container standing upright on a ground surface (G). Even if an axial load is applied to the container, the container is not deformed in an unintended shape due to buckling. Thus, the container has sufficient rigidity for such an axial load.

Description

technical field [0001] The present invention relates to a bottle-shaped container made of synthetic resin. Background technique [0002] Conventionally, as beverage containers containing various beverages, it is known to use a synthetic resin such as polyethylene terephthalate to form a preform, and then form the preform by stretch blow molding or the like. A container made of synthetic resin obtained in the form of a bottle (see Patent Document 1, etc.). [0003] In addition, there is known a filling and sealing method in which a small amount of liquid nitrogen is added to positively pressurize the inside of such a synthetic resin container (see Patent Document 2, etc.). [0004] Patent Document 1: Japanese Patent Laid-Open No. 2006-103735 [0005] Patent Document 2: Japanese Patent Laid-Open No. 2001-31010 [0006] However, in recent years, such synthetic resin containers have been strongly demanded for weight reduction and cost reduction by reducing the amount of resin...

AI Technical Summary

Problems solved by technology

[0009] However, if the amount of liquid nitrogen to be added cannot be strictly adjusted to increase the positive pressure in the container by adding liquid nitrogen, there is a tendency that the internal pressure of each container tends to be uneven, and the liquid in the headspace tends to be uneven. Surface height is also prone to unevenness

In addition, since it is estimated that the pressure rise due to the vaporization of liquid nitrogen is large, even in the case of non-carbonated beverages as the content, it is limited to a container shape that can withstand such a pressure.

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