IDiyas

For the Inventor, By the Inventor

The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 12420985 B1

PDFFull Text
Date of Patent:
Sep. 23, 2025

Filed:

Feb. 27, 2023

Method of injection molding preform

Applicant:

Yoshino Kogyosho Co., Ltd., Tokyo, JP;

Inventors:

Hiroshi Hosokoshiyama, Tokyo, JP;

Junichi Chiba, Tokyo, JP;

Seiji Iso, Tokyo, JP;

Assignee:

YOSHINO KOGYOSHO CO., LTD., Tokyo, JP;

Attorney:

Oliff PLC

Primary Examiner:

Alison L Hindenlang

Assistant Examiner:

Shibin Liang

Int. Cl.
CPC ...
B29C 45/16 (2006.01); B29B 11/08 (2006.01); B29C 45/00 (2006.01); B32B 1/00 (2006.01); B65D 1/02 (2006.01); B65D 25/54 (2006.01); B29C 45/28 (2006.01); B29K 67/00 (2006.01); B29K 105/00 (2006.01); B29L 31/00 (2006.01);
U.S. Cl.
CPC ...
B65D 25/54 (2013.01); B29B 11/08 (2013.01); B29C 45/0046 (2013.01); B29C 45/1607 (2013.01); B29C 45/164 (2013.01); B29C 45/1646 (2013.01); B32B 1/00 (2013.01); B65D 1/0215 (2013.01); B29C 2045/1614 (2013.01); B29C 45/2806 (2013.01); B29C 2949/3009 (2022.05); B29C 2949/3014 (2022.05); B29C 2949/3018 (2022.05); B29C 2949/3022 (2022.05); B29C 2949/3034 (2022.05); B29K 2067/003 (2013.01); B29K 2105/253 (2013.01); B29K 2105/258 (2013.01); B29K 2995/0018 (2013.01); B29K 2995/0026 (2013.01); B29L 2031/7158 (2013.01); B32B 2439/60 (2013.01); B65D 2203/04 (2013.01);
Abstract

A method of injection molding a test tube-shaped preform for biaxial stretch blow molding includes supplying a major material resin from outer and inner flow paths to a combined flow path for a predetermined time and rate. For a period of time within a range of the predetermined time period during which the major material resin is supplied, the intermediate layer resin is simultaneously supplied from the middle flow path to the combined flow path at a second predetermined supplying rate. A columnar laminated molten resin is injected into a cavity of a metal mold connected to a tip of the nozzle through a gate to fill the cavity, the columnar laminated molten resin being composed of the major material resin and the intermediate layer resin formed in the major material resin in a laminated manner that are combined into a columnar shape at the combined flow path.

Find Patent Forward Citations

Loading…