ISO 11443 and ASTM D3835 are two analogous standards, laying out procedures to analyze the flow properties of polymer melts up to high shear levels.这主要用于注塑和挤出的工艺设计,其中工艺设计者需要知道如何最好地设计模具、设定温度、根据聚合物熔体的流动方式调整速度和压力。 The test is performed by means of a capillary rheometer, imposing a series of pre-determined shear rates on the hot fluid by extruding it through a capillary die.记录流体撞击模具时的压力;然后可以分析所得数据以确定流动特性。 The testing temperature applied can be altered in order to determine the best processing temperature, but for practicality reasons, care should be taken when applying temperatures much higher or lower than the specified melting point.