Patent ID: 11897770
Assignee: KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC C  D | IPC C  D

Claim 0:
1. A method for producing densified carbon nanotube fiber, the method comprising:
preparing carbon nanotube fiber;
swelling the carbon nanotube fiber by applying an acid solution thereto, and stretching the carbon nanotube fiber;
coagulating the stretched carbon nanotube fiber so as to remove the acid solution present therein; and
drying the coagulated carbon nanotube fiber;
wherein in the preparing the carbon nanotube fiber, carbon nanotube fiber having a linear density equal to or greater than 5 tex is prepared, and
in the swelling and stretching the carbon nanotube fiber, the carbon nanotube fiber is stretched to a stretching ratio greater than 80% but less than or equal to 200%.