| 摘要 |
<p>Ultra-oriented, crystalline synthetic filaments (2) with high tenacity are produced by extrusion of a fiber-forming synthetic polymer melt into a liquid isothermal bath (3) maintained at a temperature of at least 30 °C above the glass transition temperature of the polymer, withdrawing the filaments from the bath and then winding up the filaments. Polyethylene terephthalate filaments so produced at 3000-5000 m/min exhibit a crystalline structure and possess birefringence of 0.20-0.22, tenacity of 7-9 g/d, break elongation of 14-30 % and boil-off shrinkage of 5-10 %.</p> |
