Synthetic-resin laminated bottle body, injection molding device and method for forming laminated preform

Abstract

The invention provides a synthetic-resin laminated bottle body, an injection molding device and a method for forming laminated preform. To minimize delamination problem with a laminated bottle body produced by biaxial stretch blow molding. A principal method for solving the problem with the laminated bottle body, produced by biaxial stretch blow molding, comprises laminating an intermediate layer between base layers, extending a plurality of longitudinal strip coupling portions, where the base layers are laminated in a directly deposited state on the opposite sides of the intermediate layer, in a region with a predetermined height, in the direction of the central axis in parallel with each other in the circumferential direction, providing as required, a plurality of circumferential strip coupling portions, where the base layers are laminated in a directly deposited state on the top and bottom surfaces of the intermediate layer, in parallel with each other in the direction of the central axis, and dividing the intermediate layer by the longitudinal strip coupling portions and the circumferential strip coupling portions.

Description

technical field [0001] The present invention relates to a synthetic resin laminated bottle body formed by biaxial stretch blow molding with an intermediate layer laminated thereon, a method for forming a laminated preform as a primary molded product thereof, and an injection molding apparatus for forming the preform . Background technique [0002] Bottles made of polyethylene terephthalate (hereinafter abbreviated as PET) resin and the like and formed by biaxial stretch blow molding are used in various fields such as beverages, food, and cosmetics. use. In particular, for applications that require gas barrier properties, a bottle body in which a gas barrier resin such as nylon-based resin or ethylene-vinyl alcohol copolymer resin is laminated as an intermediate layer on PET resin as a main material resin is used. [0003] Patent Document 1 describes a method for molding a laminated bottle formed by biaxial stretch blow molding in which such a gas barrier resin is laminated...

AI Technical Summary

Problems solved by technology

[0008] In this way, once the two layers are peeled off, they will not stick together again, so there is a problem that light is scattered or reflected at the peeled interface, and the peeling can be recognized from the outside, thereby deteriorating the appearance.

[0009] In addition, during the shrinkage process after biaxial stretch blow molding, there is also a problem of interlayer delamination due to the difference in the amount of shrinkage between the middle layer and the outer layer or inner layer.

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