machinery | Twin screw extruders
ing improvements made to the company’s twin-screw extruders against a background of the global trend towards the use of very small particle diameter fillers to enhance polymer properties. He said this calls for more homogeneous filler distribution and dispersion, as well as higher throughputs at high filler levels.
Meanwhile, Toshiba has introduced the TEM- 41SX. The new machine sits at the top of the company’s range in terms of torque density, offering a value of 18.1 Nm/cm3
Above: Entek has developed the QC3
-33MM
model for small lot compounding applications
.
This provides a screw torque of 1,423 Nm, compared to 1,019 Nm for the existing TEM-41SS. To support this improved performance, the new model has a 130kW screw drive motor, compared with 90kW on the earlier design.
Speaking at the Compounding World Forum in Philadelphia, US, last December, JSW America Vice President Paul Martin discussed recent debottleneck-
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Optimised screws JSW has been studying optimisation of screw and barrel configurations, as well as providing higher torque in all its extruder designs. One of the developments high- lighted by Martin was the company’s NIC kneading barrel, which uses longitudinal grooves that are claimed to enhance the kneading process without creating dead zones. He cited its use in production of a talc-filled, rubber modified polypropylene (24% rubber, 11% talc) for automotive applications such as bumpers and instrument panels. A compound produced on an extruder with a standard barrel displayed an Izod impact strength of around 2.4 kg/cm2 strength of around 395 kg/cm2
and a flexural , while the same compound made on an extruder with an NIC kneading
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