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C. Salas-Bringas, O.-I. Lekang, R.B. Schuller
Time variations and calibration of a screw type process rheometer

Appl. Rheol. 20:3 (2010) 34526 (11 pages)

Abstract: The present article describes and analyzes different calibration methods for a screw type process rheometer, Searle type, having a die hole at the downstream of a barrel. The work also quantifies the effect of time dependent flows due to the screw on the measurement performance. Time variations in torque and pressure become more notorious at increased resistances to flow (higher fluid viscosities and smaller die diameters). Screw speeds seem to do not affect these variations. Shear stress in the system is related to pressure and torque, and by using any of them, is possible to predict an average viscosity. Similar prediction errors were found when using torque or pressure. A section of practical applications is added to understand the use of a screw type process rheometer better. © 2010 Applied Rheology.

DOI 10.3933/ApplRheol-20-34526

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