Abstract
Melt temperature fields have been measured in single screw extrusion using novel thermocouple grid, ultrasound and infrared sensor techniques. The effects of screw and die geometry on the melt temperature profile have been investigated using simple slit and rod dies on a single screw extruder. Comparisons have been made between a general purpose polyolefin screw with gradual melting zone, a rapid transition screw, and a barrier flighted screw with a Maddock mixer. Significant differences in melting and temperature profiles were observed between the three extruder screws. Die geometry of the simple dies studied here was found to have a minor effect on the melt temperature field in regions near the die wall. Die head pressure had a more significant effect on melt temperature distribution.
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