We describe a dielectric sensor that incorporates a flow-through design so that it can be placed in-line on an extruder. Dielectric measurements have been successfully applied for measuring additive concentrations in polymer melts during extrusion processing. Calcium carbonate and alumina filled polystyrene are used to demonstrate sensor capability. Theory and experiment indicate that dielectric measurements of filled polymer melts can quantitatively determine individual or total additive concentrations with an accuracy that depends on the electrical contrast and can exceed 0.1 volume percent with polymers and compounds having one or possibly two dominant additives.
Proceedings Title: Proceedings of the Society of Plastics Engineers Annual Technical Meeting
Conference Dates: May 1, 1999
Conference Location: New York, NY
Conference Title: Society of Plastics Engineers
Pub Type: Conferences
dielectric properties, filled polymers, in-line measurements, material composition, polymer processing