METHOD FOR MELT-SPINNING, DRAWING, AND WINDING UP A MULTIFILAMENT, AND APPARATUS FOR CARRYING OUT SAID METHOD

摘要

The invention relates to a method for melt-spinning, drawing, and winding up a multifilament to form a fully drawn yarn (FDY) as well as an apparatus for carrying out said method. According to the invention, first, a plurality of filaments is extruded from a thermoplastic melt, is cooled to a temperature lying below the glass transition temperature of the thermoplastic material, and is combined into a filament bundle without feeding a finishing fluid. The filament bundle is then taken up at a speed exceeding 1,500 m/min, is heated to a temperature exceeding the glass transition temperature of the thermoplastic material, and is drawn at a drawing speed exceeding 4,000 m/min. The filament bundle is then finished using a finishing fluid, and the thread is wound up into a package. According to the invention, the finishing device is arranged in a thread running zone between the drawing device and the winding device of the apparatus, the thread having a thread running speed exceeding 4,000 m/min in said zone. The method and apparatus according to the invention thus form an energetically optimized process for producing fully drawn yarns.