Author: S. Warner 1
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  • 1 Celanese Research Company 07901 Summit New Jersey USA 07901 Summit New Jersey USA
  • 2 Kimberly-Clark Corporation 54956 Neenah WI 54956 Neenah WI
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Polyester yarn spun over a range of wind-up speeds and subsequently drawn at 373 K has been characterized by differential scanning calorimetry. Samples that are constrained from shrinking during the thermal scan respond differently than samples that are free-to-shrink. In the region of intermediate orientation, the constrained samples typically show a lower cold crystallization temperature: In the region of high orientation, the constrained samples typically show a higher melting temperature. The results are quantitatively similar to those based on fibers in which the orientation is imparted directly by high speed spinning.