77 dtex/52 f PA66 DTY加工工艺探讨

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

采用相对粘度2．53的半消光PA66切片制得93dtex／52fPA66POY，经假捻变形生产77dtex／52fPA66DTY，探讨了其加工工艺。结果表明：控制PA66切片含水量900～1000μg／g，纺丝温度为289～291℃，纺丝组件初始压力约4MPa，冷却风温度19～21℃，冷却风速度0．55～0．65m／s，使用宽槽棱状油嘴上油，控制PA66POY含油率为0．5％～0．6％，可满足PA66DTY加工要求。选择后加工速度550～700m／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77dtex／52fPA66DTY。

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） ℃.