MACHINERY | TWIN SCREW EXTRUDERS


dismantling barrels one by one, instead of disman- tling the entire barrel assembly. Side feeders are mounted on a swing arm (which also has a new design), with their position easy to change. The unit can be fitted with JSW’s Exanet or a third-party PLC. All necessary electrical components, such as motor drive and TIC controller, are mounted on the machine frame.


Above: This Leistritz ZSE MAXX twin screw extru- sion system is equipped with two of the latest LSB 50 XX side stuffers


Right: Coperion has further optimised its Involute mixing elements, which are said to enable improved throughput with heavily filled


formulations


anywhere from 10 to 20% lower than when using standard non-grooved barrels, the company claims. The TKD (Twist Kneading Disc) screw element,


meanwhile, has twisted rather than conventional straight flights, result- ing in less pressure on the flights and good dispersive mixing with low screw wear – an important advantage when compounding abrasive materials. As mixing can take place at around 10% lower temperature than with conventional mixing elements, and with less demand on the drive motor, there is a corresponding 10% lower energy consumption when using TKD elements. Improvements made to the Exanet control system’s 15-inch colour LCD control panel include better visibility of icons on the touch-screen display to enable easier triggering of specific functions. The system can also control auxiliary equipment, although JSW points out that customers can choose to use a PLC system of their own choice if they prefer. Like Entek, JSW also offers software packages for simulation of process conditions, screw design, and screw element management. JSW’s Korean subsidiary SM Platek (acquired in 2015) recently launched the TEK25MHS153


, which


Right: JSW’s latest 36mm diameter TEX34αIII extruder in the ultra-compact version with integrated control


24


has a torque density of 15.3 Nm/cm. The supplier says the new unit meets the various demands of customers in small lot production or laboratory use with a combination of high performance and easy operation. The unit provides around 40% more toque than its predecessor, the TEK25MHS. Suitable for commodity and engineering plastics, it uses a 30kW motor to provide a maximum screw speed of 1,225 rpm. A newly designed tie-bar barrel connection system allows users to change configurations by


COMPOUNDING WORLD | March 2018 www.compoundingworld.com


Pushing throughput At Coperion, Markus Schmudde, Head of Research & Development, says that to significantly increase throughput rates of its ZSK extruder series, the company has developed its special Involute screw elements with a new and patented cross section design. He says the new screw elements are ideal for highly-filled recipes (70-85% CaCO3


, TiO2


, mainly PHOTO: COPERION


based on PP/PE and 20-50% talc for automotive grades) for which the dispersion rating and the incorporation of the filler represents a limitation. Besides higher throughput rates, the Involute screw elements ensure higher loading of filler, better dispersion and homogenisation, lower energy consumption, “and a significant increase in profitability.” Throughout last year, says Schmudde, Coperion ran extensive tests with the new elements in its laboratory and has further optimised the mixing sections. “With the new Involute screw elements, Coperion has the advantage to


run highly-filled compounds on a one-size-smaller machine with comparable or even better product quality,” he says. “For customers this means significantly lower CAPEX and OPEX cost decrease due to the lower energy consumption.” Coperion has also introduced new designs of its side degassing unit ZS-EG and side feeder unit ZS-B. The redesign focuses on the optimisation of


PHOTO: LEISTRITZ


PHOTO: JSW


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