Synthetic resin window container, preform and preform injection molding device

Abstract

The object of the present invention is to solve the problems related to the formation of the transparent window in the biaxial stretch blow molding container through the nozzle structure of the injection molding device. A biaxially stretch blow-molded container having a vertical strip-shaped transparent window. In the range from the upstream end of the flow path composed of the cylindrical flow path and the reduced-diameter flow path formed in the nozzle part to a predetermined position on the downstream side, a pair of flow paths are arranged in parallel to separate the flow path in the circumferential direction. The vertical strip-shaped guide ribs, the gap between the pair of guide ribs is used as a vertical groove flow path, and the molten state B resin is supplied to the vertical groove flow path, and the molten state B resin is supplied to the cylindrical flow path other than the vertical groove flow path. The resin A divides the cylindrical flow path formed by the resin A in the circumferential direction through the longitudinal band-shaped flow path formed by the resin B.

Description

technical field [0001] The present invention relates to a windowed container of synthetic resin formed by biaxial stretch blow molding, a test tube-shaped preform, and an injection molding device for molding the preform. The transparent or translucent window portion for checking the remaining amount of the contents, and the preform is a precursor of the container. Background technique [0002] In the past, synthetic resin blow-molded containers were mostly used for beverages, foods, detergents, cosmetics, pharmaceuticals, etc., to protect the contents from ultraviolet rays, or to improve the design, etc., to make the contents invisible mostly. [0003] As a method of making the contents invisible from the outside, methods such as making the container itself opaque by coloring the resin, painting the outer surface of the container opaque, wrapping the outer surface of the container with a shrink film that is opaque or printed on the surface opaque, etc. use. [0004] Howev...

AI Technical Summary

Problems solved by technology

[0004] However, if the contents are made invisible from the outside as described above, since the remaining amount of the contents cannot be confirmed from the outside, it is neither convenient nor safe to use.

In addition, when refilling the contents and using it, there is a problem that the contents overflow due to overfilling because the filling status cannot be seen.

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