the yarn and found here to be 33 1 in a comparative example of the prior art a yarn of 40 denier 44 dtex and 13 filaments was prepared by treating a nylon 66 polymer 51 5 rv was melted in an extruder and fed to a spinning machine which was used to prepare the 40 13 yarn by a process of quenching in conditioned air converging and treating the yarn with a primary spinning oil drawing the yarn using unheated godets stabilizing the yarn with a heated fluid interlacing the yarn and winding on at a speed of about 5300 meters per minute the spinneret plate had 13 circular cross sectionally shaped capillaries as shown in fig3 a the perimeter measure of a single capillary represented in fig3 a was 22 micrometers under these spinning conditions the jet velocity of the polymer through this capillary was 100 feet per minute 50 8 cm per second during the course of preparing this circular cross sectionally shaped yarn the spinneret plate 170 on the capillary exit face 175 required wiping each 1 5 hours of yarn winding since at least 10 of the filaments were bent the tenacity and elongation of the wound up 40 13 yarn was measured exactly as in the example of the invention the measured rv was of this yarn was 52 5 rv as before the tenacity and elongation were used to calculate a u201c yarn quality u201d parameter which was found to be 31 5 using equation 3 as a result of.