本文件规定了测定在接近塑料加工中产生的速率和温度下经受剪切应力的塑料熔体的流动性的方法。根据这些方法测试塑料熔体是非常重要的，因为塑料熔体的流动性通常不仅取决于温度，还取决于其他参数；特别是剪切速率和剪切应力。 本文所述的方法可用于从10Pa？s到107 Pa？取决于压力和/或力传感器的测量范围以及流变仪的机械和物理特性。挤出流变仪中发生的剪切速率范围为1 s？1到106秒？1. 模头入口处的伸长效应导致挤出物在模头出口处溶胀。还包括用于评估挤出物溶胀的方法。 所描述的流变技术不限于仅表征壁粘附热塑性塑料熔体；例如，可以包括表现出“滑动”效应的热塑性塑料[1][2]和热固性塑料。然而，用于确定剪切速率和剪切粘度的方法对于不粘壁的材料是无效的。然而，该文献可用于表征给定几何形状的此类流体的流变行为。

This document specifies methods for determining the fluidity of plastics melts subjected to shear stresses at rates and temperatures approximating to those arising in plastics processing. Testing plastics melts in accordance with these methods is of great importance since the fluidity of plastics melts is generally not dependent solely on temperature, but also on other parameters; in particular shear rate and shear stress. The methods described in this document are useful for determining melt viscosities from 10 Pa？s to 10⁷ Pa？s, depending on the measurement range of the pressure and/or force transducer and the mechanical and physical characteristics of the rheometer. The shear rates occurring in extrusion rheometers range from 1 s^？1 to 10⁶ s^？1. Elongational effects at the die entrance cause extrudate swelling at the die exit. Methods for assessing extrudate swelling have also been included. The rheological techniques described are not limited to the characterization of wall-adhering thermoplastics melts only; for example, thermoplastics exhibiting "slip" effects^[1][2] and thermosetting plastics can be included. However, the methods used for determining the shear rate and shear viscosity are invalid for materials which are not wall-adhering. Nevertheless, this document can be used to characterize the rheological behaviour of such fluids for a given geometry.