machinery | Twin screw extruders
Right: Entek has extended its QC3
high efficiency
feature set to its 27MM and 53MM models
Cost and performance Century Extrusion has been upgrading products made at its operation in China. General manager Charles Spearing reports that the company has improved its RXT series twin screw units to provide more torque – up to 12 Nm/cm3
– and throughput.
The RXT, which is assembled in Century’s Ruiya Extrusion facility at Nanjing, features a European gearbox and high wear resistant process section components manufactured at Century’s facility in the USA. The RXT is available in screw diameters from 35mm to 135mm. “Century engineers spent significant time in Nanjing working on assembly, electrical and safety standards to ensure the RXT was ready for export to the US and Europe,” says Spearing. “Our target with the RXT is to deliver the best cost-per-performance compounder available.” Spearing says key features from Century’s CXE
(Engineered series) twin screw models are available on the RXT series as well, including the E Series low inven- tory/quick change die, double side feeding system with patented side feed barrel for highly filled compounds, and on-machine Ethernet communication. The CXE series itself was upgraded last year with torque levels up to 18 Nm/cm3
. Additional safety features include
Entek’s vacuum stuffer/side feeder combination unit is part of its new QC3 hardware programme
“smart” connectors to side feeder power connections which ensure that the side feeder is running when signalled from the control system. An extra interlock has been added to provide certainty that both sides of the safety clutch guards are in place before operation can start. Feddem has extended its range of FED MTS machines, which now includes screw diameters ranging from 26 to 82 mm. The latest model, the ED 82 MTS, has a new gearbox with a torque density of over 16 Nm/ cm³ and a drive power of 800 kW. The new compounder is said to be ideally suited to the manufacture of larger
production batches of engineer- ing plastics; depending on the product formulation, an hourly throughput of two to four
tonnes is possible. Designed according to the same principles as other machines in the product family, the FED 82 MTS also features screws without kneading block to ensure more gentle processing of engineering plastics. The first MTS unit was commissioned last year at
Akro-Plastic (a sister company to Feddem within the K.D. Feddersen group). “With a processing length of 32 L/D, this new extruder demonstrates extremely good scale-up results”, says Thorsten Cöln, head of process engineering at Akro-Plastic. “On this machine, even highly reinforced compounds with up to 50 % glass-fibre content produced to date have excellent product quality.” Feddem developed a new strand die head to suit the
new extruder size. The curved die plate can accommo- date up to 25 % more holes with the same hole spacing as a flat plate, or it can have the same number with greater spacing. The extruder can be fitted with the FSB side-feeder
for controlled feed of reinforcements and fillers, and also with the FSV lateral vacuum degassing unit. Both are fitted on identical frames, which means the process unit can be converted from FSB to FSV operation in just a few simple steps.
Tackling barrel wear KraussMaffei Berstorff highlights the elliptical wear protection liners for the barrel of its ZE BluePower twin-screw extruders among its latest innovations. The company says these optional liners, which can be replaced without having to change the entire barrel, provide a cost-effective solution for processing of wear-intensive compounds. The company says the elliptical shape of the liners enables a minimum distance to the cooling bores and cartridge heater bores to be achieved, while ensuring adequate wall thickness is maintained. In addition, the convex liner geometry prevents liner deformation in the upper and lower apex zone while pin bores in the liner serve for centring purposes. “In contrast to floating liners, a contact collar avoids
28 COMPOUNDING WORLD | March 2016
www.compoundingworld.com
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