METHOD FOR HIGH-SPEED SPINNING OF POLYESTER FIBER

PURPOSE:To provide a method for high-speed spinning of polyester fibers by which the inflow of an accompanying air stream into a cylindrical heating unit can be controlled, a yarn can efficiently be heat-treated in the unit and the polyester fibers excellent in performances of yarn quality without any size unevenness can be produced at a high speed with good operating efficiency. CONSTITUTION:This method for high-speed spinning of polyester fibers is to carry out the melt spinning from a spinneret having a spinning hole group divided into >=3 groups, freely detachably install a narrowing guide 5 having 5-25mm caliber at an inlet of a cylindrical heating unit 4, provide an aspirator 6 for threading under the guide and regulate the internal temperature of the cylindrical heating unit to 150-250 deg.C, in a method for high-speed spinning of the polyester fibers by once cooling filaments (Y) melt spun from a spinneret (L) to a temperature of the glass transition point or below, then running the resultant yarn in the cylindrical heating unit 4, heat-treating the yarn, subsequently applying an oil thereto with an oil applicator 7 and taking off the oiled yarn at >=4000m/min. Since the caliber of the narrowing guide can simply be changed, the accompanying air stream can readily be controlled at a low cost.