Title:
METHOD FOR MANUFACTURING CARBON FIBER BUNDLE
Document Type and Number:
WIPO Patent Application WO/2021/090641
Kind Code:
A1
Abstract:
In order to provide a method for suppressing the generation of fluff during conveying by a drive roller when producing a carbon fiber bundle having a high total fineness, a high elastic modulus, and a large yarn width with twisting added, provided is a method for manufacturing a carbon fiber bundle, the method comprising: performing a flame retardant treatment for heat-treating a polyacrylonitrile-based carbon fiber precursor fiber bundle in an oxidizing atmosphere at 200-300°C to obtain a flame retardant fiber bundle; then performing a pre-carbonization treatment for heat-treating the flame retardant fiber bundle in an inert atmosphere, in which the maximum temperature is controlled to be 500-1200°C, to obtain a pre-carbonized fiber bundle; and then performing a carbonization treatment for heat-treating the pre-carbonized fiber bundle in an inert atmosphere, in which the maximum temperature is controlled to be 1200-3000°C, to obtain a carbon fiber bundle, wherein the fiber bundle is moved in contact with the drive roller before and after the carbonization treatment, the obtained carbon fiber bundle has a total fineness A of 6000-40000 dtex and a maximum twist angle B of 1-10°, the tension C of the fiber bundle in the carbonization treatment is 50-500 N/bundle, and the diameter D of the drive roller before and after the carbonization treatment is 200-1000 mm.
Inventors:
TANAKA FUMIHIKO (JP)
WATANABE JUN (JP)
WATANABE JUN (JP)
Application Number:
PCT/JP2020/038446
Publication Date:
May 14, 2021
Filing Date:
October 12, 2020
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/22; D01F9/32
Domestic Patent References:
| WO2019203088A1 | 2019-10-24 |
Foreign References:
| JPH11269726A | 1999-10-05 | |||
| JP2005256201A | 2005-09-22 |
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