Container with synthetic resin window, preform and preform injection molding method

Abstract

In a container with a synthetic resin window, which is an injection-molded test tube-shaped preform that has been biaxial stretch blow molded to a bottle-shaped container with a synthetic resin window, a circumferential wall is formed from a transparent base layer (211). A light-blocking or non-transparent intermediate layer (212) is laminated in the base layer (211) over a region of said circumferential wall at a specified height. The intermediate layer (212) is configured so as to be laminated on the region covering the entire circumference of the circumferential wall except for a non-laminated section (213), which extends on the circumferential wall of the container as a longitudinal band along the direction of the central axis of the container and where the intermediate layer (212) is not laminated. Said non-laminated section (213) configures the window (213w).

Description

technical field [0001] The present invention relates to a synthetic resin container with a window formed by biaxial stretch blow molding having a transparent to translucent window portion from which the residual amount of the contents can be checked from the outside, and a test tube-shaped preform which is a precursor of the container. Part and the injection molding method of the preform. Background technique [0002] In the past, synthetic resin blow-molded containers were mostly used for beverages, foods, detergents, cosmetics, pharmaceuticals, etc., in order to protect the contents from ultraviolet radiation, to impart light-shielding properties, or to improve design. In most cases, it is set so that the contents cannot be seen. [0003] As a method of imparting light-shielding properties so that people cannot see the contents from the outside, the following methods are used: using colored resin to design the container itself to be opaque; painting the outer surface of t...

AI Technical Summary

Problems solved by technology

) In containers such as biaxially stretched blow-molded bottles made of resin, if a vertical band-shaped transparent window is formed like a direct blow-molded container, colored resin may mix into a part of the transparent window and damage the window. Appearance, which in turn causes a part of the window part to become opaque, etc.

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