Crimping analysis of textured polyester multifilament yarn

The properties of textured POY PES multifilament yams are conditioned by texturing temperature, texturing speed, stretching degree and by the ratio of disc peripheral speed and yam speed. In the paper attention is focused on crimping of yams. New method for defining crimping limits is proposed. The method is based on the flow analysis of the force-elongation function. POY multifilament polyester yams, having the fineness of 167f36x1 dtex were analyzed, The texturing of PES multifilament yarns was performed using different first heater temperatures (350 degrees C, 400 degrees C. 450 degrees C) and maintaining the constant temperature of the second heater (180 degrees C), then with different texturing speeds (500 m/min. 600 m/min, 700 m/min, 900 m/min, 1000 m/min, 1100 m/min), using different ratio of the disc circumferential speed to yarn speed (2.15, 2.20, 2.25) and at the extension degree of 1.665.