FLAMEPROOFING APPARATUS.

摘要

This invention relates to an improvement in a flameproofing apparatus in which two sections (roller chambers) enclosing a series of rollers, which are provided in an opposed state for transferring a precursor fiber, are partitioned off from a thermal treatment section (a thermal treatment chamber) by two opposed walls which are provided with openings through which the precursor fiber passes, wherein (1) the two opposed walls are separated at a distance that allows the precursor fiber to pass the space therebetween in 5 to 60 seconds, (2) means for maintaining each of the temperature of the surfaces of the rollers and that of the roller chambers at a temperature which is lower than that of the thermal treatment chamber by 10 to 80 DEG C but exceeds 180 DEG C, is provided, and (3) the thermal treatment chamber is provided with a means for blowing hot air onto the precursor fiber. Thus, the present invention provides a flameproofing apparatus capable of imparting flameproofness to a precursor carbon fiber at a high speed in a short period of time without causing the fusion or runaway reaction of the fiber.