Carbon fibers and process for producing the same

摘要

In the course of producing acrylic fibers, the spun filament bundle before the heat stretching treatment is subjected to a special stretching treatment in a warm water bath under a specific condition so that the degree of filament separability of said spun filament bundle traveling through the heat stretching step will be maintained within a prescribed range, and when the acrylic fibers so prepared are heat-treated for carbonization, carbon fibers representing a peculiar load-elongation behavior can be produced in an industrially advantageous manner.