A model for predicting extrudate swell and average cell diameter of polypropylene foam is proposed based on the relationship between the extrudate swell and capillary number.

综合胀大比与毛细管数的关系，提出了聚丙烯发泡体系挤出胀大和泡孔平均直径的预测模型。

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Based on the formula, we can determine the cell service ratio and the number of the servers which curbs the average cell delay and the cell loss ratio in the permissive range.

由已经得到的公式，可以确定将平均时延及丢包率控制在所允许的范围的服务率和服务台数。

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