ULTRASONIC INVESTIGATION OF PROCESS VARIATION DURING SINGLE SCREW EXTRUSION AND INJECTION MOULDING: REAL TIME DETECTION OF TEMPERATURE PROFILE AND MATERIAL DEGRADATION

摘要

Ultrasound transit time measurements are used on an industrial scale extruder and injection moulding machine to monitor bulk melt temperatures in the melt by a non-invasive technique, using an ultrasound 'virtual instrument' operating at 10Hz sampling of transit time. Process induced change in the polymer melt is also monitored using the same technology.