利用Polyflow软件对一种衣架式流延模头内熔体的流动和模具变形进行了三维耦合数值模拟。结果表明:衣架式模头中熔体的流动可视为歧管内(沿歧管方向)和狭缝中(沿挤出方向)的压力流的组合;模头狭缝表面在模具厚度方向的变形沿挤出方向近似为线性增加,而沿模具宽度方向为非线性减小;模具变形后的熔体出口流率由狭缝的实际间隙和扇形区出口处的压力共同决定,单位宽度的出口流率沿模具宽度方向先增加后减小。 Polyflow software was used to simulate the three-dimensional coupled flow and mold deformation in a hanger-type die. The results show that the flow of melt in the hanger die can be considered as a combination of the pressure flow in the manifold (along the manifold direction) and in the slit (along the extrusion direction); the deformation of the die slit surface in the thickness direction of the die Along the extrusion direction is approximately linear increase, while along the mold width direction of the non-linear decrease; after the deformation of the mold melt outlet flow rate by the slit of the actual gap and the sector outlet pressure jointly determine the unit width of the outlet flow The rate along the mold width first increase and then decrease.