腈纶纤维致密化过程中“失透”机理及工艺条件优化

Mechanism of devitrifying for acrylic fiber in compactification and optimum technology parameters

腈纶纤维在致密化过程中产生“失透”。研究表明 :正常丝中如混有失透丝 ,会造成染色不匀、含油分配不均 ,强度下降等问题。本文分析了“失透”的机理。通过正交实验确定减少“失透”的最佳工艺条件 :F1 4压辊压力 0 .2 5MPa ;干球温度 1 2 5℃ ;停留时间 1 6min;风门开度 :入口 1 0 0 %、5 0 %、0、0 ,出口 0、0、5 0 %、1 0 0 %

We study the 'devitrifying' phenomena of acrylic fiber in the compactification process. It reveals that 'devitrifying' is bound to decrease uniformity of dyeability,oil-content, and fiber strength; if normal acrylic fiber is mixed with devitrified ones. We analyze the mechanism of devitrifying and determine, via orthogonal experiment, the optimum parameters of conditioning to reduce these structural defects: roller pressure,0.25MPa;dry-bubble temperature,125℃;staying period, 16min;openness of wind-gap:inlet, 100%?50%?0?0,outlet,0?0?50%?100%?