78 dtex/68 f半消光PA66弹力丝纺丝工艺的优化

Optimization of spinning process of 78 dtex/68 f semi-dull PA 66 elastic yarn

采用相对黏度为2.47的半消光PA66切片生产78 dtex/68 f半消光多孔细旦PA66弹力丝,对其纺丝工艺进行了优化。结果表明:选择PA66切片干燥温度95～100℃,干燥时间20～25 h,纺丝温度292～295℃,集束位置距喷丝板800 mm,卷绕速度4 150 m/min,侧吹风速度0.55 m/s,组件压力16～17 MPa,上油率0.65%时,生产稳定;生产的93 dtex/68 f PA66预取向丝断裂强度为3.98 cN/dtex,断裂伸长率为58.36%,78 dtex/68 f PA66弹力丝断裂强度为4.33 cN/dtex,断裂伸长率为23.42%。

A semi-dull porous fine PA 66 elastic fiber of 78 dtex/68 f was produced from semi-dull PA66 chips with the relative viscosity of 2.47. The spinning process was optimized. The results showed that the PA66 pre-oriented yarn of 93 dtex/68 f can be produced smoothly with the breaking strength 3.98 cN/dtex and elongation at break 58.36% and PA 66 elastic fiber of 78 dtex/68 fwith the breaking strength 4.33 cN/dtex and elongation at break 23.42% when PA 66 chip drying temperature was 95 -100℃, drying time 20 -25 h, spinning temperature 292 -295 ℃, collection position 800 mm from the spinneret, winding speed 4 150 m/min, cross air blow speed 0.55 m/s, spinpack pressure 16 - 17 MPa, oil up-take 0.65%.