PROCESS FOR PRODUCING ULTRAFINE FIBER OF VINYLIDENE-FLUORIDE-BASED RESIN, AND ULTRAFINE FIBER OF VINYLIDENE-FLUORIDE-BASED RESIN

摘要

The purpose of the present invention is to satisfactorily produce an ultrafine fiber comprising a vinylidene-fluoride-based resin. A raw filament comprising a vinylidene-fluoride-based resin is heated by an infrared light beam while being sent along the longitudinal direction of the raw filament. The heated raw filament is stretched by an air stream flowing along the longitudinal direction.