粗旦丙纶长丝不匀率的影响因素分析

Analysis of influential factors on yarn irregularity of coarse denier PP filament

分析了T30S,Z30S两种切片及其纺丝拉伸等工艺对粗旦丙纶长丝不匀率的影响.结果表明,聚丙烯的相对分子质量及其分布、等规度和纺丝温度、冷却吹风速度、拉伸比率、上热盘温度以及上油量等对纤维不匀率产生明显的影响.选择相对分子质量(18～36)×104,相对分子质量分布小于5,等规度大于95%,水质量分数小于0.1%,灰分质量分数小于100μg/g的原料,同时,控制Z30S切片纺丝温度250℃,T30S切片降温母粒加入量低于3%,侧吹风速度0.3～0.7 m/s,拉伸倍数4倍,油水比为7,可使粗旦丙纶长丝的不匀率降低.

The effects of T30S and Z30S chips, spinning process and drawing process on yarn irregularity of coarse denier PP filament were analyzed. The results showed that the relative molecular weight and its distribution of polypropylene, isotacticity, spinning temperature, quenching speed, draw ratio, drawing godet temperature and oiling amount had evident effect on yarn irregularity. The yarn irregularity of coarse denier PP filament can be minimized by selecting fiber-grade polypropylene with relative molecular weight (18 - 36) × 104 and its distribution below 5, isotacticity higher than 95% , water content below 0.1% and ash content lower than 100 μg/g and controlling spinning temperature at 250℃ for Z30S chip, addition of chemical degradation master batch below 3% in T30S chip,quenching speed 0.3 -0.7 m/s,draw ratio of 4 and oleines of 7.