ACRYLIC CARBON FIBER BUNDLE WITH HIGH STRENGTH AND ELONGATION AND ITS PRODUCTION

摘要

PURPOSE:An acrylic polymer solution is filtered, extruded into a coagulation bath to form a precursoy yarn, then subjected to heat treatment under specific conditions, thus producing the titled fiber bundle with high strength and elongation as well as high reliability, because of its little deviation in qualities and performances. CONSTITUTION:A solution of an acrylic polymer mainly containing acrylonitrile is filtered by means of a filter with less than 5 micron aperture and extruded into a coagulation bath at a draft of 2.0-5.0. The resultant wet yarn is washed with water, drawn, treated with a finishing oil and dried to give the precursor yarn. The resultant precursor yarn is oxidized by heating it in an atmosphere of the air filtered through a filter of less than 1 micron aperture at 200-350 deg.C, then carbonized in an inert atmosphere at a temperature over 1,000 deg.C to produce the objective carbon fiber bundle consisting of more than 1,000 carbon filaments more than 85% of which are free from defects caused by foreign matters sticking thereto at the broken surfaces.