METHOD FOR SPIN STRETCHING POLYMERS

摘要

The invention relates to a method for simultaneously spin stretching one or more heavy-duty yarns involving the following steps: a) a polymer melt is fed to a spinning device; b) the melt is extruded through a spin nozzle (5) having several extruding openings while producing fibers (6); c) the fibers (6) are lead through a cooling zone (7); d) the fibers (6) are guided through a drop shaft (8); e) the fibers (6) are tensioned between a delivery galette (10) and a first stretching galette; f) the fibers are then stretched between the first stretching galette (11) and a second stretching galette; g) the fibers (6) are relaxed between the second stretching galette (12) and a relaxing galette (13); h) said fibers (6) are wound up by a winder (15), whereby during the method, the fibers (6) are also provided with a preparation by means of a preparation unit (9). The inventive method is characterized in that polyamide yarns are produced, stretching occurs, in essence, in a dry atmosphere, and in that a galette having an arithmetic mean value of its surface roughness Ra of at least 0.2 mu m is used as the first stretching galette (11).