Rheometrics and melt flow index measurement

摘要

A viscosity or melt flow index measurement device comprising:a sample enclosure (125),loading means (90). for applying a sample under pressure to the enclosure,a restriction or orifice (129) within the enclosure,monitoring means (112) for determining the pressure within the enclosure upstream of the restriction,an output port (130) in the enclosure downstream of the restriction,temperature control (91,92,76) and monitoring means for determining the sample temperature within the enclosure,control means for initiating and repeating a test cycle under various pressure and flow conditions for a given temperature,measuring means (112) for measuring the pressure and flow conditions within the enclosure,data processing means for computing the viscosity or melt flow index from successive measurements of pressure and flow rate through the output orifice-or restriction.