Abstract
The pressent article discusses the optimum drawing condition of undrawn filaments of poly-xylyleneadipamide. The relatioship between the moisture regain of undrawn filaments and the optimum hot-pin temperature is also discussed.
The results obtained are: 1. Undrawn filaments do not crystallize at 20°C and below 65% RH. But they crystallize at 20°C and over 70% RH. 2. When tenacity and breaking elongation of drawn filaments and drawing tension are plotted agaist the reduced pin-temperature, smooth curves are obtained, only when the moisture regain of undrawn filaments is between 2.2 and 3.6wt%.
If the moisture regain of undrawn filaments increases by 1%, the pin-temperature should be lowered by 12°C. Consequently the following equation is established: TM; =115-12M TM; : optimum pin-temperature (°C) M: moisture regain of undrawn filaments (wt%)
