of 12 the break elongation of 24 was clearly higher polyester having a relative viscosity n intr of 0 68 was melted at 305 u00b0 c and was extruded at a rate of 307 g min from two spinneret plates each having 192 holes each hole having a diameter of 0 4 mm the extruded filaments were passed through a 1700 mm long blow duct in which they were cooled by a transversely directed stream of air flowing at a speed of 0 6 m sec thereafter a 99 preparation was applied to the filaments by cold rolls so that the oil film of the finished yarn was 0 7 the filaments were then drawn between two sets of rolls duos at a temperature of 115 u00b0 c and a draw ratio of 1 6 1 on the second duo the filaments were allowed to thermally set at a temperature of 220 u00b0 c were then passed over the unheated let down roll system at a temperature of 45 u00b0 c and a speed of 3 050 m min and through the cooling zone at a temperature of 38 u00b0 c and were finally wound up at a speed of 2 990 m min with a permissible amount of shrinkage between duo 2 and the let down roll system with a relaxation tension of 0 2 g dtex and a windup tension of 170 g a yarn of 1100 192 dtex denier was obtained the residence time of the yarn in the let down roll system was 0 22 sec no disturbances occurred during the drawing operation the dry heat shrinkage was 3.