Abstract: In order to investigate the melt flow law of polyester industrial yarn during melt spinning, a model was built according to spinneret orifices used by enterprises and a numerical simulation of melt spinning process of polyester industrial yarn was carried out by adopting three-dimensional finite element method (FEM). The effects of the convergence angle, the aspect ratio and the distribution of inlet flow of the spinneret orifice on the temperature field, velocity field, shear rate and pressure field were compared and analyzed. The results show that the temperature field is insensitive to changes of spinneret orifice structure and is greatly affected by the inlet flow rate. When the convergence angle increases, the growth rate of velocity in transition zone increases. If the aspect ratio is too big, the shearing effect of the melt is strengthened by the die section, which is not conducive to the uniform distribution of velocity. The inlet flow rate has great influence on the melt flow state. Besides, it is the most conducive to the uniform distribution of weloaty when the spinneret orifice has an convergence angle of 73 ° and an aspect ratio of three.

Key words: polyethylene terephthalate, polyester industrial yarn, melt spinning, spinneret orifice, numerical simulation

摘要： 为了研究涤纶工业丝熔融纺丝过程熔体流动规律,根据企业用喷丝孔建立模型,运用三维有限元(Finite element method, FEM)数值模拟方法对涤纶工业丝熔融纺丝的过程进行了数值模拟,对比分析了喷丝孔收敛角、口模长径比以及喷丝孔入口流量对挤出过程温度场、速度场、剪切速率场以及压力场分布的影响。结果表明:温度场对喷丝孔结构变化不敏感,受入口流量影响较大;收敛角的增大会使熔体在收敛段速度增长趋势变大;长径比太大会使得熔体受口模段剪切作用增强,不利于速度均匀分布;入口流量大小对熔体流动状态影响较大。收敛角为73 °,长径比为3的喷丝孔结构最有利于速度的均匀分布。

关键词: 聚对苯二甲酸乙二醇酯, 涤纶工业丝, 熔融纺丝, 喷丝孔, 数值模拟