The performance of blended thick and thin polyester filament(BTTPF) before and after alkali treatment and the effect of the additive on it were discussed emphatically.

• 讨论了共混纺丝法制备的涤纶粗细节丝（BTTPF）的独特性能和添加剂对它的影响，并对碱处理后的BTTPF性能进行了探索。