用挤压塑性计测定热塑性塑料流率的测试方法

熔体流动速率仪是用于测定热塑性树脂的熔体质量流动速率（MFR）熔体体积流动速率（MVR）和熔体密度，它不仅适用于熔融温度较高的聚碳酸酯尼龙氟塑料聚芳砜等工程塑料,也适用于聚乙烯聚苯乙烯聚丙烯ABS树脂聚甲醛树脂等熔融温度较低的塑料测试,广泛地应用于塑料原料制品石油化工等行业以及相关大专院校科研单位和商检部门 1.1 This test method covers measurement of the rate of extrusion of molten resins through a die of a specified length and diameter under prescribed conditions of temperature, load, and piston position in the barrel as the timed measurement is being made. 1.2 Procedure A is a manual cutoff operation based on time used for materials having flow rates that fall generally between 0.15 and 50 g/10 min. Procedure B is an automatically timed flow rate measurement used for materials having flows from 0.50 to 900 g/10 min. By both procedures, the piston travel is generally the same during the timed measurement; the piston foot is about 46 and 20.6 mm above the die. Comparable flow rates have been obtained by these procedures in interlaboratory round-robin measurements of several materials described in 13.1. Provision is made for calculation of melt volume-flow rate as well as melt mass-flow rate. 熔融指数仪