Klaus Straka, Bernhard Praher, Georg Steinbichler,
"Non-invasive ultrasound based temperature measurements at reciprocating screw plastication units: Methodology and applications"
, in Sadhan C. Jana: PROCEEDINGS OF PPS-30: The 30th International Conference of the Polymer Processing Society, Serie PROCEEDINGS OF PPS-30: The 30th International Conference of the Polymer Processing Society, Vol. 1664, AIP Publishing, 5-2015
Original Titel:
Non-invasive ultrasound based temperature measurements at reciprocating screw plastication units: Methodology and applications
Sprache des Titels:
Englisch
Original Buchtitel:
PROCEEDINGS OF PPS-30: The 30th International Conference of the Polymer Processing Society
Original Kurzfassung:
Previous attempts to accurately measure the real polymer melt temperature in the screw chamber as well as in the screw channels have failed on account of the challenging metrological boundary conditions (high pressure, high temperature, rotational and axial screw movement). We developed a novel ultrasound system - based on reflection measurements - for the online determination of these important process parameters. Using available pressure-volume-temperature (pvT) data from a polymer it is possible to estimate the density and adiabatic compressibility of the material and therefore the pressure and temperature depending longitudinal ultrasound velocity. From the measured ultrasonic reflection time from the screw root and barrel wall and the pressure it is possible to calculate the mean temperature in the screw channel or in the chamber in front of the screw (in opposition to flush mounted infrared or thermocouple probes). By means of the above described system we are able to measure axial profiles of the mean temperature in the screw chamber. The data gathered by the measurement system can be used to develop control strategies for the plastication process to reduce temperature gradients within the screw chamber or as input data for injection moulding simulation.
Sprache der Kurzfassung:
Englisch
Veröffentlicher:
AIP Publishing
Serie:
PROCEEDINGS OF PPS-30: The 30th International Conference of the Polymer Processing Society