The Cambridge MultiPass Rheometer (MPR)

Design

The Cambridge Multi Pass Rheometer (MPR) is a novel dual-piston capillary rheometer consisting of two servo-hydraulically controlled pistons enclosed within temperature-controlled barrels and a central test section.
The pistons can be moved back and forth to drive the material contained within the MPR through the test section for precise repeatable measurements on a sample.

Applications

  • Investigate the rheological behaviour of melts, liquids and soft solids

  • Precise processing studies of complex fluids in complex flows

  • Corroborating Computational Fluid

  • Dynamic models

  • Establish shear-ageing characteristics.

Key features

  • Wide range of testing on same sample without the inconvenience of having to load a fresh sample each time

  • Samples size can be as small as 10g

  • The sample can be precompressed, allowing tests to be conducted at high, mean or minimum pressures

  • High wall shear rates

  • Precise digital control

  • In normal operation the displacement of the pistons is varied and the resulting pressure change is measured. However, with the latest control software it is possible to set the pressure and measure the resulting displacement variation.

Operating Conditions

  • Operating temperature range -20 to 200°C

  • Wall shear rates of up to 160,000s-1

  • Operating pressure to 200 barg

  • Variable piston velocity up to 200mm/second.

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