进行了各种相关工艺条件对挤出造粒的影响，包括挤出速度、模头温度及螺杆形式和定型模具对挤出成型的研究；
The impact of various process conditions on extrusion and pelletizing is studied, including the change of extrusion speed, die head temperature and screw types.
定型模是挤出模具的重要组成部分，采用数值模拟方法研究定型模内塑料异型材的冷却过程，可以指导定型模冷却系统的设计。
Shaped mould is the important part of extrusion die for injection moulding. The cooling process of shaped plastic in shaped mould was studied using numerical simulation.
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