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.
分析了模头流道结构和熔体在圆环型材挤出模中的流量，为环类型材挤出模设计提供了依据。
Analyzing the die channel structure and the melt flow of the circle profile in the extrusion die provides the basis of the die design for the circle profile.
计算塑料熔体在锥环形流道中停留时间的一般公式可稍作推广即可应用到其它形状的流道计算中。
Some relative equations which are deriveted from the general calculation formula of residence time of plastic melt in the taper ring channel, could be applied to other configurations of channel.
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