PROCESS FOR MANUFACTURING CARBON-FIBER PRECURSOR ACRYLIC FIBER BUNDLE AND STEAM DRAWING APPARATUS

摘要

This process for manufacturing a carbon-fiber precursor acrylic fiber bundle and this steam drawing apparatus are characterized in that the drawing of an acrylic fiber bundle with a pressured-steam drawing apparatus is conducted by: opening an acrylic fiber bundle by blowing a fluid thereto; supplying humidifying steam to the opened acrylic fiber bundle at a fiber temperature of 80 to 130° C. to adjust the water content of the fiber bundle to 3 to 7%; and thereafter drawing the resulting acrylic fiber bundle in a pressurized-steam atmosphere. Thus, the present invention can prevent the breaking of a single fiber, the fluffing of the fiber bundle, and the breaking of the whole of the fiber bundle, though such defects are susceptible to occurring in a case where an acrylic fiber bundle is drawn by steam drawing at a high draw ratio, at a higher speed, or into a fiber having a small denier.

主权项

1. A process for manufacturing a carbon-fiber precursor acrylic fiber bundle, comprising:
drawing an acrylic fiber bundle in a pressurized steam atmosphere, and in the following order: opening the acrylic fiber bundle by spraying a fluid to the acrylic fiber bundle; supplying a humidifying steam to the opened acrylic fiber bundle whose temperature has been adjusted to be 80° C. to 130° C., thereby making the moisture content of the acrylic fiber bundle to be 3% to 7%; and drawing the humidified acrylic fiber bundle in a pressurized steam atmosphere.