基于Polyflow对扁平复合导电纤维喷丝板孔道优化设计

Design of spinneret pilot hole for flat composite conductive fibers based on Polyflow software

为了获得较好的扁平复合导电纤维,对于扁平喷丝孔,设计了一种锥形导孔结构;基于有限元分析软件Polyflow数值模拟的方法,对比分析了圆形导孔与锥形导孔对聚合物熔体在孔道内的压力、速度及剪切速率的分布的影响;分别使用圆形导孔与锥形导孔进行复合导电纤维纺丝验证实验,并对纤维性能进行测试。结果表明:相比圆形导孔,熔体在锥形导孔至微孔出丝面的压力降变化较平缓,速度分布趋于均匀,剪切速率变化较均匀,锥形导孔有利于流体稳定及纤维成形;纺丝实验验证了锥形导孔制备的扁平复合导电纤维在纤维截面清晰度与组分排列均匀度方面优于圆形导孔,纤维的导电性能更好,进一步证明了锥形导孔在纺制扁平导电纤维的优异性。

A conical pilot hole structure was designed for flat spinneret holes in order to obtain favorable flat conductive composite fibers.The influence of circular and conical pilot holes on the distribution of pressure,velocity and shear rate of polymer melt in the channel was compared and analyzed by the numerical simulation of the finite element analysis software Polyflow.The spinning validation experiments of composite conductive fibers were carried out by using circular and conical pilot holes separately,and the properties of the fibers were tested.The results showed compared with the circular pilot hole,the pressure drop of the melt changed more smoothly from the conical pilot hole to the micro-hole outlet surface,the velocity distribution tended to be uniform,and the shear rate changed more uniformly,and the conical guide hole was conducive to fluid stability and fiber formation;the spinning experiments showed that the flat conductive composite fibers prepared by conical pilot holes were superior to the fibers prepared by circular pilot holes in cross-sectional clarity;composition uniformity and especially in conductivity,which further proved the superiority of conical pilot holes in spinning flat conductive fibers.