一步法涤纶双收缩丝纺丝工艺及性能研究

One-step spinning process and properties of bi-shrinkage PET yarns

采用一步法高速纺丝,在相邻纺丝位生产涤纶高收缩预取向丝(POY)和低收缩全拉伸丝(FDY),再合股加弹变形,生产涤纶双收缩混纤复合丝(BSY),探讨了纺丝工艺对BSY结构及性能的影响。结果表明:高收缩POY的纺丝速度、低收缩FDY的拉伸倍数、热辊温度是影响BSY的结构及性能的主要因素;当热辊GR1,GR2的速度分别为820,2 950 m/min,温度分别为85,110℃,纺丝速度为3 000 m/min时,得到的BSY结晶度为36.60%,声速取向因子达0.723,沸水收缩率达40.80%,其他力学性能也较为优异,断裂强度为1.909 cN/dtex,断裂伸长率为38.17%。

Bi-shrinkage PET yarns （BSY） were prepared by folding and texturing high-shrinkage PET preoriented yarn（POY） and low-shrinkage PET fully-drawn yam （FDY） at adjacent spinning positions via one-step high-speed spinning process. The effect of spinning process on the structure and properties of BSY was discussed. The results showed that the key factors bearing upon the structure and properties of BSY were the spinning speed for high-shrinkage POY, draw ratio for low-shrinkage FDY and hot roller temperature ; and the produced BSY exhibited the erystallinity of 36.60% , sonic orientation factor O. 723, boiling water shrinkage 40.80% and other excellent mechanical properties when the speed of the hot rollers GR1 and GR2 was 820 and 2 950 m/min and the temperature was 85 and 110 ℃, respectively, and the spinning speed was 3 000 m/min.