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。
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.
结果表明,不同角度圆锥口模挤出过程中,熔体在收敛流道受到拉伸流变,导致强烈的入口弹性效应,表现出熔体在不同角度圆锥口模挤出时有不同的挤出胀大比。
The results show that the extensional flow of melt in convergent die results in intense entrance elastic effect and distinct extrusion swell in conical die with different angles.
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