中文摘要：

从挤出口模设计原则出发，综述了数值模拟技术在塑料异型材口模流道的曲面构型，入口角和压缩比、降低或消除挤出胀大和挤出口模成型段的设计、熔体流动平衡和压力降的研究进展，以及口模设计的发展趋势。

英文摘要：

The design principle of extrusion dies is introduced. Advances in the research on the application of numerical simulation in profile extrusion dies is summed up, including the shape, inlet angle, compression ration about transition section of die, some methods on how to reduce or eliminate extrusion swell and die design, flow balance and pressure drop. And the development trend of die is pointed out.