Title:
METHOD FOR PRODUCING FLAME-PROOF FIBER BUNDLE, AND METHOD FOR PRODUCING CARBON FIBER BUNDLE
Document Type and Number:
WIPO Patent Application WO/2020/203531
Kind Code:
A1
Abstract:
The present invention enables the production of a polyacrylonitrile-based carbon fiber bundle that is stable in terms of quality by suppressing adhesion of fine particles to a flame-proof fiber bundle. For the purpose of achieving the above objective, the present invention provides a method for producing a flame-proof fiber bundle, wherein: a polyacrylonitrile-based fiber bundle is subjected to a flame-proofing treatment at a temperature of 200-300°C in an oxidizing atmosphere where the concentration of fine particles having a particle diameter of 0.3 μm or more is 300 particles/liter or more; and if the specific gravity of the fiber bundle is from 1.15 to 1.25 and/or the specific gravity of the fiber bundle is from 1.30 to 1.45, the surface potential of the fiber bundle is set to a value from -1 kV to +1 kV.
Inventors:
OKAMURA KAZUMASA (JP)
ITO TAKAHIRO (JP)
SAITO DAISUKE (JP)
ITO TAKAHIRO (JP)
SAITO DAISUKE (JP)
Application Number:
PCT/JP2020/013261
Publication Date:
October 08, 2020
Filing Date:
March 25, 2020
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/22; D06C7/04
Foreign References:
| JP2002242029A | 2002-08-28 | |||
| JPH11241230A | 1999-09-07 | |||
| JPH08246248A | 1996-09-24 | |||
| CN104451962A | 2015-03-25 | |||
| CN1900392A | 2007-01-24 | |||
| JP2018111891A | 2018-07-19 | |||
| JPS4724966B1 | 1972-07-08 |
Download PDF: