MACHINERY | TWIN SCREW EXTRUDERS
Right: CPM’s CXE 45 HO, which will be launched at the upcoming NPE show in the US, is offered with many optional “smart” features
900 rpm). In future, smart features will be available on all machine types and sizes. For the motor, safety clutch and gearbox, for instance, optional temperature and vibration sensors can be applied to provide a compre- hensive condition monitoring solution to enable a preventive maintenance programme to be planned. A gearbox oil sensor constantly evaluates impurities, water content, soot formation, air content, oil ageing, acidification, oil and ambient temperature, relative humidity, transmission, electrical conductivity and the rela- tive permittivity of the oil. Sensors on each screw shaft assess torque and
provide information on performance correspond- ing to the specific energy input to the product, as well as an indication of wear on shafts and barrel. There are also energy monitoring features for drive, heaters and cooling water to summarise the energy efficiency of the extruder.
Below: Entek’s QC3
33 is the
latest addition to the QC3 range and is intended for small lot
compounding duties
PHOTO: ENTEK
Screw development Thomas Bauer, Managing Director at Extricom Extrusion (which along with Century Extrusion in the US and Ruiya Extrusion in China form the three arms of CPM Extrusion Group) also highlights new screw segments and barrier screws for more gentle incorporation of glass fibres and thermally sensitive flame retardants and additives. In addition, he points to the company’s “T-Profile Technology” elements, which lift mixing and degassing efficiency. “Furthermore, the tie-rod design enabled us to implement an extraordinarily efficient cooling water system for a maximum of temperature control. In combination with the high duty and high-power cartridge heater, even high tempera- ture nylons for automotive applications [can be] processed with an unmatched control,” Bauer says. Entek will feature its newest twin-screw extruders and technologies at NPE 2018. There will be two machines on its booth: the new QC3
33mm co-rotat-
ing twin-screw extruder, which was introduced in 2017 and is being shown publicly for the first time; and the high-output 73mm twin-screw extruder.
The QC3
33mm is a new size for Entek. Designed
for small lots of compounds, it includes all the company’s latest QC3
and Quality Control) features. Other QC3
(Quick-Change, Quick-Clean, models
have 27mm, 43mm, and 53mm screws. Larger models (with 73mm, 103mm, and 133mm screws) are currently not available in this format. The company will also have two interactive work
stations to demonstrate what it claims is a unique screw-layout software program. “Visitors will be encouraged to use the program to see how easy and fast it is to input their information and design a screw layout that will work for their compounding needs,” the company says.
Modular novelties Leistritz Extrusion will display a ZSE 50 MAXX that includes a modular design for barrels and screws and an insulated barrel cover. The company says this system is novel in that the extended length facilitates multiple downstream operations, includ- ing multi-stage venting, liquid injection and up to two LSB 50 XX side stuffers for filler or fibre introduction into the melt stream. Suitable for a wide range of compound types, it can be equipped with a 600HP AC motor and can produce at up to 1,000 kg/hr with the screws rotating at 1,200 rpm. LSB XX series side stuffers are supplied with a high OD/ID screw ratio of 2.0 and can convey materials with very low bulk densities. The screws can be segmented, enabling them to be config- ured for the raw material in use, while barrels can be jacketed for cooling or heating. Internal cooling of the screws is also optional. Leistritz will also show its ZSE 18 system for production of 3D printing filaments at NPE. Apart from a ZSE 18 co-rotating twin screw extruder fitted with a gear pump and a die to produce 1 to 5 mm 3D fila- ments, it includes loss-in-weight feeders, a custom air-rack for air
20 COMPOUNDING WORLD | March 2018
www.compoundingworld.com
PHOTO: CENTURY EXTRUSION GROUP
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