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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 11486059 B1

PDFFull Text
Date of Patent:
Nov. 01, 2022

Filed:

Mar. 11, 2019

Method and device for stabilizing precursor fibers for the production of carbon fibers

Applicant:

Centrotherm International Ag, Blaubeuren, DE;

Inventors:

Andreas Keller, Opfingen, DE;

Gunter Fauth, Urbach, DE;

Uwe Ziegler, Blaubeuren, DE;

Assignee:

CENTROTHERM INTERNATIONAL AG, Blaubeuren, DE;

Attorney:

Tarolli, Sundheim, Covell & Tummino LLP

Primary Examiner:

Leo B Tentoni

Int. Cl.
CPC ...
B29C 71/02 (2006.01); F27B 5/04 (2006.01); F27B 9/04 (2006.01); F27B 9/28 (2006.01); F27D 7/06 (2006.01); D01F 9/22 (2006.01); D01D 10/02 (2006.01); D01F 9/17 (2006.01); D01F 9/32 (2006.01); B29C 71/00 (2006.01); D02J 13/00 (2006.01); F27B 9/12 (2006.01);
U.S. Cl.
CPC ...
D01F 9/225 (2013.01); D01D 10/02 (2013.01); D01F 9/17 (2013.01); D01F 9/324 (2013.01); D01F 9/328 (2013.01); F27B 9/042 (2013.01); F27B 9/045 (2013.01); B29C 71/0009 (2013.01); B29C 2791/006 (2013.01); D02J 13/00 (2013.01); D10B 2101/12 (2013.01); F27B 2009/122 (2013.01); F27D 2007/066 (2013.01);
Abstract

The invention relates to a method and to a device for stabilizing precursor fibers for the production of carbon fibers. In the method, precursor fibers are first heated to a first temperature and held at the temperature for a predefined duration. Subsequently, the precursor fibers are heated to at least one second temperature, which is higher than the first temperature, and held at said temperature for a predefined duration. During each heating and between the heating steps, the precursor fibers are in a gas atmosphere having a negative pressure in the range between 12 mbar and 300 mbar and having an oxygen partial pressure of 2.5 to 63 mbar. The device has at least one evacuable, elongate vacuum chamber for feeding the precursor fibers through, at least two lock units and at least one heating unit. At least one lock unit is used for the sealed insertion of precursor fibers into the at least one vacuum chamber, while at least one other lock unit is used for the sealed removal of precursor fibers from the at least one vacuum chamber. The heating unit has at least two individually controllable heating elements, which are suitable for heating the at least one vacuum chamber to at least two different temperatures in heating zones which are adjacent in the longitudinal direction.

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