Synthetic resin container with window, preform, and method of injection molding preform

Abstract

A synthetic resin container or bottle with a window obtained by subjecting a test tube-shaped preform made by injection molding to biaxial stretch blow molding is provided. The container includes a transparent base layer; a circumferential wall formed of the transparent base layer; and a light-blocking or opaque intermediate layer formed in the base layer in a laminated manner to cover an area of a predetermined height of the circumferential wall. The intermediate layer is formed in a laminated manner over an area covering an entire circumference of the circumferential wall excluding a non-laminated section, where the intermediate layer is not formed, that extends in a shape of a longitudinal strip along the central axis direction of the container on the circumferential wall of the container. The non-laminated section serves as a window section.

Description

TECHNICAL FIELD[0001]The disclosure relates to a synthetic resin container with a window made by biaxial stretch blow molding, which has a transparent or semitransparent window section through which residual quantity of contents can be observed from outside. The disclosure also relates to a test tube-shaped preform being a precursor of the container and a method of injection molding the preform.BACKGROUND[0002]Blow molded containers made of synthetic resin have been conventionally used primarily for containing, for example, beverages, food, detergents, cosmetics, and medicine. They are in many cases given a light-blocking property to protect the contents from ultraviolet rays or the like, or configured such that the contents thereof becomes invisible to improve the appearance and design qualities.[0003]Giving a light-blocking property or making the contents invisible from outside has been achieved for example by making the container itself opaque using a colored resin, by coating th...

AI Technical Summary

Benefits of technology

The disclosed products have a unique structure where a clear window section is provided without mixing colored resin. This is achieved by using a transparent base layer with a laminated structure that includes an opaque intermediate layer. The laminated structure prevents direct contact between the contents and the intermediate layer, thereby preventing quality change in the contents. This results in a container with improved appearance and quality.

Problems solved by technology

However, when the contents are made invisible from outside as above, the residual quantity of the contents cannot be observed from outside, causing inconvenience and uneasiness in use.

In particular, when refilling the container with contents, the filling state is invisible so that the contents may be poured too much to be spilled out.

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