同时指出流量脉动系数最大的影响因素是油液的弹性模量和油泵的工作压力，其次是柱塞数。
Maximum influencing factors of flow fluctuation coefficient are the elastic modulus of the oil and the working pressure of the pumps, the piston number being a minor factor.
由于柱塞冲压挤出成型工艺与常规方法相比具有特殊性，因此能够用于加工聚四氟乙烯（PTFE）和超高分子量聚乙烯（UHMWPE）等高粘弹性材料。
The process of Ram-punch extruder is developed in recent years. It's applied in the produce of PTFE, UHMWPE and so on, which are high viscoelastic materials.
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