Veronika Putz, Ivana Burzic, Bernhard Zagar, Jürgen Miethlinger,
"In-line Ultrasonic Melt Flow Measurement of Polypropylene with Different Fillers"
: EUROSENSORS 2014, the 28th European Conference on Solid-State Transducers, in Procedia Engineering, Serie Procedia Engineering, Vol. 87, Nummer 0, Elsevier, Seite(n) 156 - 159, 2014, ISSN: 1877-7058
In-line Ultrasonic Melt Flow Measurement of Polypropylene with Different Fillers
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EUROSENSORS 2014, the 28th European Conference on Solid-State Transducers
Pulsed Wave Velocimetry (PWV) is an ultrasonic technique for measuring velocity profiles in flowing liquids. We already demonstrated that PWV can be used to obtain velocity profiles of polypropylene melt, flowing in capillary dies with channel depths less than 2 mm. The required ultrasound transducer with large bandwidth (which is restricted to operating temperatures below 50 °C) is coupled to the hot melt using a temperature buffer, which serves as acoustic waveguide, but decouples transducer and melt thermally. In this contribution, we show results obtained in-line during the extrusion of glass-fiber-filled polypropylene as well as talcum-filled polypropylene at various feed rates.