设计了厚度为0.12mm的聚对苯二甲酸乙二醇酯（PET）薄膜衣架式挤出流道,使用有限元软件模拟了聚合物熔体的流动规律,获得了流道内部的压力场、速度场和温度场的分布,分析了阻流设计对流场的影响。研究表明,流道结构对压力分布影响显著,对速度、温度分布影响不明显;流道阻流部分尺寸较小的改变,会引起流道内部熔体压力较大的变化,易导致挤出成型过程的不稳定,从而显著影响产品质量。此外,挤出流量对流场压力分布影响很小。
A coathanger type extrusion runner of polyethylene terephthalate （PET） film with thickness 0.12mm was designed. The polymer flow was simulated through finite element software, and the distribution of pressure, velocity and temperature field were obtained. The influence of polymer flow on the choked flow design was analyzed. The results show that the runner structure influences the pressure distribution significantly, influenles the distribution of speed and temperature slightly. If the size of choked flow structure of the runner is changed slightly, the pressure of the melt flow within the range of the runner will be changed markedly. So the size change of choked flow structure easily causes the process of extrusion instable, and significantly affects the product quality. Furthermore, the influence of melt flow rate on pressure distribution is insignificant.
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