Patent ID: 6667096
Filing Date: 2003-12-23
Classification: D01F,Y10T

Abstract:
In a process for producing and spooling preoriented polyester flaments comprising at least 90 weight % (relative to the total weight of the polyester filaments) polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT) the improvement comprising:a) setting the spinline extension ratio in the range of 70 to 500; b) passing the filaments through a cooling delay zone of from 30 mm to 200 mm in length immediately after exiting from the spinning nozzles; c) cooling the filaments to below the PBT or PTMT solidification temperature; d) bundling the filaments into thread at a distance of between 500 mm and 2500 mm from the spinneret plate; e) setting the thread tension in front of and between draw-off galeftes to between 0.05 cN/dtex to 0.20 cN/dtex; f) spooling the thread with a thread tension of between 0.025 cN/dtex to 0.15 cN/dtex; g) adjusting the spooling speed to between 2200 m/mm. and 3500 m/mm.