Breaking barriers to higher output rates with densified ultrafine talc during melt compounding on the corotating intermeshing twin screw extruder

摘要

The melt compounding of densified and nondensified ultrafine talc into polypropylene was performed on a 40 mm corotating twin screw extruder for comparison of compounding characteristics and product performance properties. Compounding nondensified talc was found to be volume limited by the maximum quantity of talc that the machine could be fed whereas the densified talc compounding was torque limited. The plastic performance properties for both types of talc filled compounds were comparable and would be widely acceptable for these high performance grades of talc filled polypropylene. Predictions of throughput rates on larger machines with higher toque ratings are included.