In the numerical simulation of parison formation, there are two main methods: one is to treat the polymer melt as a Newtonian fluid, the other is as a viscoelastic fluid.

• 对型坯成型阶段的数值模拟可分为两种方法:一种是将型坯机头内的聚合物熔体看作牛顿流体,另一种是将其看作粘弹性流体。