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Comment PDF Automation & Control

This rheometer performs multipass measurements

By Gerald Ondrey |

Strata Technology Ltd. (Sunbury-on-Thames, U.K.; www.stratatec.co.uk) has commercialized the Cambridge Multipass Rheometer (MPR), which was developed by professor Malcolm Mackley at the Dept. of Chemical Engineering and Biotechnology, Cambridge University (www.ceb.cam.ac.uk) for advanced studies of the rheological properties of melts, liquids and soft solids. The device consists of two servo-hydraulically controlled pistons enclosed within temperature-controlled barrels on either side of a central test section (capillary or slit die). The sample is totally enclosed and it is displaced cyclically between the barrels via the test section. The speed of the pistons can be varied from 0.05 to 200 mm/s, enabling very high shear rates to be generated within the test section. The system is controlled by software developed by Omiga Technology Ltd. (Quedgeley, U.K.). The MPR can perform multiple measurements on one sample at controlled flowrates, temperatures and pressures, and may be used to assess shear-aging characteristics. It can also be used in conjunction with other techniques, such as x-ray diffraction and optical birefringence to provide realtime, in-situ measurements of materials under shear. Because the sample is retained in the test…
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