In order to optimize control of the extrusion process of polymer compounds in the screw extruder, it is necessary to monitor the compounding state in-line. Therefore a polyetheretherketone (PEEK) buffer rod with a cooling device is analyzed and designed. The ultrasound probe, whose performance is tested at high temperature, is composed of a newly developed PEEK buffer rod and ultrasonic transducer. Then the ultrasonic probe is applied for the in-line ultrasonic monitoring of polymer extrusion of low-density polyethylene (LDPE)/CaCO3 compounds and LDPE/BaSO4 compounds. The results show that the attenuation has a relation to the composition of the polymer compounds and filler concentration. The results also indicate that the presented ultrasonic technique may be used for determining the mixing status of polymer/filler systems with multi-probes at different locations inside the extruder barrel during the extrusion processes.
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