In the numerical simulation of parison formation , there are two main methods: one is to treat the polymer melt as Newtonian fluid, the ot her is to treat the melt as 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。