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 12539658 B1

Date of Patent:

Feb. 03, 2026

Filed:

Aug. 05, 2020

Resin extruder , rotor-type screw shaped so that the size of the gap between the screw and the inner surface of the cylinder holding the screw changes, and resin manufacturing method

Applicant:

The Japan Steel Works, Ltd., Tokyo, JP;

Inventors:

Makoto Ishikawa, Tokyo, JP;

Kyouhei Yata, Tokyo, JP;

Yohei Shimizu, Tokyo, JP;

Masao Kurihara, Tokyo, JP;

Assignee:

THE JAPAN STEEL WORKS, LTD., Tokyo, JP;

Attorney:

Potomac Law Group, PLLC

Primary Examiner:

Charles Cooley

Int. Cl.

CPC ...

B29C 48/60 (2019.01); B29B 7/48 (2006.01); B29C 48/415 (2019.01); B29C 48/595 (2019.01);

U.S. Cl.

CPC ...

B29C 48/60 (2019.02); B29B 7/489 (2013.01); B29C 48/415 (2019.02); B29C 48/595 (2019.02);

Abstract

A resin extruder capable of efficiently improving performance of kneading a resin material is provided. A resin extruder () according to one embodiment includes a cylinder (), and a rotor-type screw () that is disposed in the cylinder () and kneads a resin material (). In the rotor-type screw (), a top part () of a flight () is formed in such a way that a gap between the top part () and an inner surface of the cylinder () is changed from a front point to a rear point of the rotor-type screw in a rotation direction in a cross section that is vertical to an axial direction.

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