US 12,435,451 B2
Method for manufacturing precursor fiber bundle, method for manufacturing carbon fiber bundle, and carbon fiber bundle
Yosuke Nakamura, Osaka (JP); Atsumi Nishida, Osaka (JP); and Hidekazu Yoshikawa, Osaka (JP)
Assigned to TEIJIN LIMITED, Osaka (JP)
Appl. No. 17/282,441
Filed by TEIJIN LIMITED, Osaka (JP)
PCT Filed Oct. 2, 2019, PCT No. PCT/JP2019/038976
§ 371(c)(1), (2) Date Apr. 2, 2021,
PCT Pub. No. WO2020/071445, PCT Pub. Date Apr. 9, 2020.
Claims priority of application No. 2018-190505 (JP), filed on Oct. 5, 2018.
Prior Publication US 2021/0381133 A1, Dec. 9, 2021
Int. Cl. D01F 9/22 (2006.01); D01D 5/06 (2006.01); D01F 6/38 (2006.01)
CPC D01F 9/225 (2013.01) [D01D 5/06 (2013.01); D01F 6/38 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for manufacturing a precursor fiber bundle, the method comprising:
spinning by extruding a spinning solution through a spinneret to produce a coagulated fiber bundle;
applying an oil agent to the coagulated fiber bundle to produce an oiled coagulated fiber bundle;
drying and densifying the oiled coagulated fiber bundle to produce a dried and densified coagulated fiber bundle;
steam stretching the dried and densified coagulated fiber bundle to produce a steam-stretched coagulated fiber bundle;
applying water to the steam-stretched coagulated fiber bundle to obtain a water-applied coagulated fiber bundle having a moisture content in a range of 25˜50%; and
interlacing the water-applied coagulated fiber bundle by applying a fluid onto the water-applied coagulated fiber bundle.