熔体体积流动速率（MVR）是表征聚合物流动特性的重要参数之一。
Melt volume flow rate (MVR) is one of the important parameters for characterization of flow property of polymers.
以流道间隙处熔体体积均匀变化为条件，对管材挤出成型机头内腔的形状曲线进行分析优化，并且导出了一个优化曲线。
On condition that plastic melt volume undergoes a uniform change, the authors analyse the internal shape of pipe die and produce an optimum shape curve.
证明随着熔体洁净度增大，单位体积中的晶粒数将先增加，然后减少。
The results showed that with the increase of cleanness of the melt, the number of grain per unit volume increased at first, and then decreased.
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