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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 10532492 B1

PDFFull Text
Date of Patent:
Jan. 14, 2020

Filed:

Nov. 13, 2015

Twin-screw extruder including variable diameter of screws and barrel and kneading method using the twin-screw extruder including variable diameter of screws and barrel

Applicant:

Toshiba Kikai Kabushiki Kaisha, Chiyoda-ku, Tokyo, JP;

Inventors:

Akiyoshi Kobayashi, Fuji, JP;

Toshiki Nakazawa, Yokohama, JP;

Masatoshi Ohara, Mishima, JP;

Hiroyuki Saito, Numazu, JP;

Assignee:

TOSHIBA KIKAI KABUSHIKI KAISHA, Tokyo, JP;

Attorney:

DLA Piper LLP US

Primary Examiner:

Charles Cooley

Int. Cl.
CPC ...
B29B 7/48 (2006.01); B29C 48/52 (2019.01); B29C 48/53 (2019.01); B29C 48/40 (2019.01); B29C 48/645 (2019.01); B29B 7/82 (2006.01); B29B 7/90 (2006.01); B29B 7/84 (2006.01); B29K 23/00 (2006.01); B29K 105/00 (2006.01); B29K 509/00 (2006.01);
U.S. Cl.
CPC ...
B29B 7/489 (2013.01); B29B 7/82 (2013.01); B29B 7/847 (2013.01); B29B 7/90 (2013.01); B29C 48/402 (2019.02); B29C 48/52 (2019.02); B29C 48/53 (2019.02); B29C 48/645 (2019.02); B29K 2023/12 (2013.01); B29K 2105/251 (2013.01); B29K 2509/00 (2013.01);
Abstract

One embodiment provides a twin-screw extruder which is used to knead materials and has excellent productivity. The twin-screw extruder includes screws. The screws include double thread screws in which first screw portions engage with each other. Ratio D/C of external diameter Dof the first screw portion to a shaft distance C ranges from 1.25 to 1.40. The screws further include triple thread screws in which third screw portions engage with each other. Ratio D/C of external diameter Dof the third screw portion to the shaft distance C ranges from 1.05 to 1.10. External diameter Dof a second screw portion decreases gradually from the first screw portion toward the third screw portion.

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