热处理对低熔点复合纤维干热收缩率和黏结性能的影响

Effect of heat treatment on dry heat shrinkage and bonding property of low-melting point composite fibers

将皮层为低熔点聚对苯二甲酸乙二醇酯(PET)、芯层为常规PET的低熔点复合纤维在100~180℃下热处理时间40 min,研究热处理温度对复合纤维干热收缩率的影响;将低熔点复合纤维按一定比例和常规涤纶混合、开松,混合纤维于100~180℃下热处理时间40 min,研究不同热处理温度和低熔点复合纤维含量对混合纤维黏结性能的影响。结果表明:低熔点复合纤维的单纤维及多纤维的干热收缩率均随热处理温度的升高而增大,在热处理温度160℃时可获得较稳定的干热收缩率,单纤维干热收缩率为14.5%,多纤维干热收缩率为34.1%;随热处理温度的提高及低熔点复合纤维含量的增加,混合纤维的黏结性能均增强,综合考虑混合纤维的黏结性能及使用性能,较佳热处理工艺为低熔点复合纤维质量分数20%、热处理温度160℃、热处理时间40 min。

Low-melting point composite fibers with low-melting point polyethylene terephthalate(PET)as the sheath layer and conventional PET as the core layer were exposed to heat treatment at 100-180℃for 40 min.The effect of heat treatment temperature on dry heat shrinkage of low-melting point composite fibers were studied.The low-melting point composite fibers were mixed and loosen with conventional polyester fibers at a certain proportion to produce mixed fibers which were heat treated at 100-180℃for 40 min.The effects of different heat treatment temperatures and low-melting point composite fiber content on the bonding property of the mixed fibers were studied.The results showed that the dry heat shrinkage of single and multiple low-melting point composite fiber increased with the elevation of heat treatment temperature,and the stable dry heat shrinkage can be obtained at a heat treatment temperature of 160℃,14.5%for single fiber and 34.1%for multiple fiber;the bonding property of the mixed fibers was enhanced with the increase of heat treatment temperature and the content of low-melting point composite fibers;and taking into account the bonding property and service performance of the mixed fibers,the optimal heat treatment conditions were determined as followed:20%low-melting point composite fibers by mass fraction,heat treatment temperature 160℃and heat treatment time 40 min.