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Assessment of Piezoelectric Sensors for the Acquisition of Steady Melt Pressures in Polymer Extrusion

Institute for Polymers and Composites/i3N, University of Minho, 4800-058 Guimarães, Portugal
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Fluids 2019, 4(2), 66; https://doi.org/10.3390/fluids4020066
Received: 26 February 2019 / Revised: 25 March 2019 / Accepted: 1 April 2019 / Published: 3 April 2019
(This article belongs to the Special Issue Advances in Experimental and Computational Rheology)
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Abstract

Piezoelectric sensors have made their way into polymer processing and rheometry applications, in particular when small pressure changes with very fast dynamics are to be measured. However, no validation of their use for steady shear rheometry is available in the literature. Here, a rheological slit die was designed and constructed to allow for the direct comparison of pressure data measured with conventional and piezoelectric transducers. The calibration of piezoelectric sensors is presented together with a methodology to correct the data from the inherent signal drift, which is shown to be temperature and pressure independent. Flow curves are measured for polymers showing different levels of viscoelasticity. Piezoelectric slit rheometry is validated and its advantage for the rheology of thermodegradable materials with viscosity below 100 Pa·s is highlighted. View Full-Text
Keywords: piezoelectric; pressure transducers; extrusion; rheology piezoelectric; pressure transducers; extrusion; rheology
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Costa, S.; Teixeira, P.F.; Covas, J.A.; Hilliou, L. Assessment of Piezoelectric Sensors for the Acquisition of Steady Melt Pressures in Polymer Extrusion. Fluids 2019, 4, 66.

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