PA 6/PET扁平复合纤维界面分布的数值模拟

Numerical simulation of interfacial distribution of PA 6/PET flat composite fiber

以聚己内酰胺(PA 6)和聚对苯二甲酸乙二醇酯(PET)的扁平复合纤维为例,考虑壁面滑移弹性行为,利用Polyflow软件对非牛顿流体在喷丝板扁平孔道内的界面分布进行数值模拟,分析了扁平微孔的长宽比(W/H)、微孔深度(L)以及PA 6/PET流量比对两种熔体间界面位置分布的影响。结果表明:在总流量为3.2×10-7m3/s时,随着喷丝板微孔W/H的增大,界面位置偏移量随之增大,界面相对偏移量没有变化;随着喷丝板微孔L的增大,熔体界面位置偏移量逐步增大,界面位置相对偏移量也逐步增大;随着PA 6/PET流量比的增大,熔体界面位置偏移量由PA 6一侧逐步减小至PET一侧反向逐步增大,合理的流量比能够减小界面偏移量,改善纺丝时复合扁平纤维的成形效果。

Taking polycaprolactam （PA 6）/polyethylene terephthalate （PET） flat composite fiber as the example, the interfa- cial distribution of the non-Newtonian polymeric fluid in flat spinneret microholes was simulated with a Polyflow software taking into account the elastic behavior of the wall slip. The effects of the length-width ratio （ W/H ） and depth （ L ） of the flat micro- holes and the PA 6/PET flow ratio on the interface position distribution between the melts were analyzed. The results showed that the melt interface position deviation were gradually increased with the increase of W/H of the spinneret, but the relative deviation did not change when the total flow was 3.2×10^-7m^3/s; the melt interface position deviation and the relative deviation were both gradually increased as the L of the spinneret was increased; the melt interface position deviation was decreased from the PA 6 side to the PET side and then increased reversely as the PA 6/PET flow ratio was increased; a rational flow ratio could decrease the interface deviation and improve the formation of the composite flat fiber.