77 dtex/52 f PA66 DTY加工工艺探讨

采用相对粘度2.53的半消光PA66切片制得93 dtex/52 f PA66 POY,经假捻变形生产77 dtex/52 fPA66 DTY,探讨了其加工工艺。结果表明:控制PA66切片含水量900~1 000μg/g,纺丝温度为289~291℃,纺丝组件初始压力约4 MPa,冷却风温度19~21℃,冷却风速度0.55~0.65 m/s,使用宽槽棱状油嘴上油,控制PA66 POY含油率为0.5%~0.6%,可满足PA66 DTY加工要求。选择后加工速度550~700 m/min,拉伸倍数1.24~1.26,D/Y比1.7,热箱温度(210±2)℃,可生产出优质的77 dtex/52 f PA66 DTY。

Discussion of processing technique of 77 dtex/52 f PA66 DTY

The semi-dull PA66 chip with the relative viscosity of 2.53 was spun into 93 dtex/52 f PA66 POY and subsequently produced into 77 dtex/52 f PA66 DTY after false-twist texturing process.The processing technique was discussed.The results showed that the process conditions satisfying the processing demand of PA66 DTY were decided as followed: water content of PA66 chip 900-1 000 μg/g,spinning temperature 289-291℃,initial pressure of spinning pack about 4 MPa,quenching air temperature 19-21 ℃ and speed 0.55-0.65 m/s,wide-slot prismatic nipple,oil content of PA66 POY 0.5%-0.6%.The high-quality 77 dtex/52 f PA66 DTY could be produced under the conditions as followed: after processing speed 550-700 m/min,draw ratio 1.24-1.26,D/Y ratio 1.7 and hot box temperature(210±2) ℃.