Iii aramid fiber tow one kind of original hot drawing process

The present invention discloses an original aramid fiber tow III hot drawing process, characterized in that the heat drawing process is divided into two steps: The first step is the original tow III aramid fibers at 270 to 300 ℃ low temperature, the constant tension was heat drawn at 0.2-1.0cN / tex, fiber after the second step is the first step in the process continues at a constant stretching tension 0.01 ~ 0.2cN / tex at 340-500 ℃, two-stage heat drawing were performed under a normal pressure inert gas. Since the present invention uses a two-stage heat drawing process, the first step of which is constant tension and heat stretching at a low temperature, only make full use of the low glass transition temperature of the fiber at the same temperature, is more conducive stretch-oriented features of the macromolecular chains, combined with a larger tension applied to the design, thereby greatly improving the degree of orientation of the finished aramid fibers III, so that the tensile strength and initial modulus are improved. The present invention The process is simple, low cost, mature technology, is suitable for industrial production.