Blow molding device

Abstract

The blow molding device includes: a mold (1) for blow molding to which a bottomed cylindrical preform (PF) is mounted, and a mouthpiece fitted to the preform (PF) mounted on the mold (1) The blowing nozzle (13) in the part (PFb) and the pressurized liquid supply part (22) that supplies the pressurized liquid (L) to the blowing nozzle (13), and the liquid (L) is passed through the blowing nozzle ( 13) and filled into the preform (PF), so that the preform (PF) is molded into the shape of the cavity (2) according to the mold (1), characterized in that the blowing nozzle (13) has a configuration A center hole (13d) on its axis and a plurality of peripheral holes (13e) formed with an inner diameter smaller than the center hole (13d) and configured to surround the center hole (13d), through the center hole (13d) and A plurality of peripheral holes (13e) are used to fill the liquid (L) into the preform (PF).

Description

Blow molding device technical field The present invention relates to a blow molding device for blow molding a bottomed cylindrical preform into a pot, and more particularly to a blow molding device for using a liquid as a pressurized fluid for blow molding. Background technique Resin jars such as jars made of stretched polypropylene (OPP) and jars made of polyethylene terephthalate (PET) (polyester bottles) are being used for beverages, Various uses such as food and cosmetics. Such an altar is usually formed into a predetermined shape by biaxial stretch blow molding of a resin preform formed into a bottomed cylindrical shape by injection molding or the like using a blow molding apparatus. As a blow molding device, there is known a device that uses a pressurized liquid instead of pressurized air as the pressurized fluid filled in the preform. In this case, by using the content liquid that is finally filled into the product, such as beverages, cosmetics, and medicines, as...

AI Technical Summary

Problems solved by technology

However, it is difficult to stretch the preform straight in the longitudinal direction only by the pressurization of the liquid filling, and the preform cannot be blow-molded stably due to eccentricity and cracking.

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