Synthetic resin container with shape retainability

Abstract

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.

Description

technical field [0001] The present invention relates to a synthetic resin container which can meet the requirement of wall thinning, and especially relates to a container which can effectively prevent the reduction of rigidity caused by the thinning of the wall, and has the required shape retention ability (shape retention) nature) synthetic resin container. Background technique [0002] Among various synthetic resin containers, PET bottles made of polyethylene terephthalate (PET) resin are the most common. Inferior, and the cost is also low. Therefore, in recent years, PET bottles are mostly used as containers for food, beverages, cosmetics or pharmaceuticals. [0003] However, such a synthetic resin container has a disadvantage of low strength against external force. For example, when the user holds the main body of the container to pour out the contents, deformation will inevitably occur at the place where the user holds it. In order to improve the resistance of this ...

AI Technical Summary

Problems solved by technology

[0006] However, for this kind of container, when reducing its wall thickness to reduce the amount of resin (light weight) (for example, the resin amount of a 2-liter container is reduced from 69 grams to below 55 grams), due to the content itself Due to the weight (water head pressure, water head pressure) and high temperature, the lower half of the main body of the container will expand outwards and cannot maintain its original shape

Especially when the container is provided with a depressurization absorbing plate to prevent deformation caused by depressurization, this outward expansion is particularly serious

[0007] In addition, although the formation of transverse ribs can effectively maintain the appearance shape of the container, due to the influence of the thinning of the container wall, the ribs are easily bent due to heat, so that the reinforcing effect cannot be effectively exerted

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