CARBON FIBER MANUFACTURING METHOD

摘要

Provided is a carbon fiber manufacturing method with which high quality carbon fibers can be obtained. The carbon fiber manufacturing method satisfies all of (1)-(3) below.
(1) The method comprises a step of introducing carbon fiber precursor fiber bundles that have been spread in sheet form into a flameproofing furnace, flameproofing the carbon fiber precursor fiber bundles introduced into the flameproofing furnace in a temperature range of 200°C to 300°C, introducing the flameproofed fiber bundles obtained from the flameproofing treatment into a carbonization furnace, and carbonizing the flameproofed fiber bundles introduced into the carbonization furnace in a temperature range of 300°C to 2500°C.
(2) The flameproofing furnace has a heat-treatment chamber and a sealing chamber adjacent thereto and discharges air from the sealing chamber to the outside of the flameproofing furnace.
(3) The space velocity (SV) (1/h) of the hot air blown from the heat-treatment chamber into the sealing chamber satisfies the following relationship: 80 ‰¤ SV ‰¤ 400.