Method and device for producing resin container

The stretch blow molding method and apparatus address the limitations of extrusion blow molding by creating resin containers with a through hole at the center, ensuring high accuracy and complex shape reproducibility for luxury designs.

WO2026116462A1PCT designated stage Publication Date: 2026-06-04NISSEI ASB MASCH CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
NISSEI ASB MASCH CO LTD
Filing Date
2025-11-28
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing extrusion blow molding methods for resin containers with through holes result in issues like burrs, uneven wall thickness, and surface roughness, making them unsuitable for luxury designs such as cosmetic bottles.

Method used

A method and apparatus using stretch blow molding to create a resin container with a through hole near the center, involving injection molding, preliminary and final blow molding steps, and a resin film pressing process to form complex shapes with a through hole, utilizing a biaxial stretch blow molding apparatus.

Benefits of technology

The method and apparatus produce resin containers with a through hole at the center, achieving less burrs, excellent dimensional accuracy, and reproducibility of complex surface shapes, suitable for luxury designs like cosmetic bottles.

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Abstract

The present invention provides a method and a device for producing a resin container with a through hole provided in the vicinity of the center part of the body part, by using stretch blow molding. A method for producing a resin container according to one aspect is a method for producing a resin container with a through hole formed in the body part, the method comprising: an injection molding step for producing a preform by injection molding; and a blow molding step for blow molding the preform to produce the resin container. The blow molding step includes: a preliminary blow molding step for molding the preform into an intermediate molded body; a resin-film pressing step for accommodating, after the stretching rod is retracted upward, the intermediate molded body in a pair of split molds having protrusions facing each other with a gap therebetween when the molds are closed, and closing the molds to sandwich a resin film at a portion corresponding to the through hole of the intermediate molded body; and a final blow molding step for blow molding the resin container by introducing pressurized gas into the intermediate molded body with the sandwiched resin film.
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