US 12,359,349 B2
Method for manufacturing carbon fiber bundle
Takuya Kataoka, Otsu (JP); Naoto Hosotani, Ehime (JP); Takamitsu Hirose, Ehime (JP); and Yusuke Kuji, Ehime (JP)
Assigned to Toray Industries, Inc., Tokyo (JP)
Appl. No. 17/911,776
Filed by Toray Industries, Inc., Tokyo (JP)
PCT Filed Mar. 15, 2021, PCT No. PCT/JP2021/010303
§ 371(c)(1), (2) Date Sep. 15, 2022,
PCT Pub. No. WO2021/200061, PCT Pub. Date Oct. 7, 2021.
Claims priority of application No. 2020-059608 (JP), filed on Mar. 30, 2020.
Prior Publication US 2023/0193522 A1, Jun. 22, 2023
Int. Cl. D01F 9/21 (2006.01); D01F 9/32 (2006.01); F27B 9/04 (2006.01); F27B 9/40 (2006.01); F27D 7/02 (2006.01)
CPC D01F 9/21 (2013.01) [D01F 9/32 (2013.01); F27B 9/047 (2013.01); F27B 9/40 (2013.01); F27D 7/02 (2013.01); F27D 2007/023 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for manufacturing a carbon fiber bundle, the method comprising:
a stabilization process of subjecting an acrylic fiber bundle to a heat treatment within a range of 200° C. to 300° C. in an oxidizing atmosphere;
a pre-carbonization process of performing a heat treatment within a range of 300° C. to 1,000° C. using a heat treatment furnace having at least one inert gas supply port on each of an incoming side and an outgoing side of the fiber bundle and at least one exhaust port between the incoming-side and outgoing-side inert gas supply ports, the heat treatment being performed with a temperature of an inert gas supplied being higher on the outgoing side than on the incoming side; and
a carbonization process of performing a heat treatment at a temperature of 1,000° C. to 2,000° C. in an inert gas atmosphere,
wherein, from a position at which an atmospheric temperature in the heat treatment furnace is 300° C., the position being on the most outgoing side in a machine length direction, up to the inert gas supply port on the incoming side, a flow of an inert atmosphere within the heat treatment furnace in the pre-carbonization process consists only of a flow in a parallel flow direction with respect to a travel direction of the fiber bundle in the machine length direction.