machinery | Twin screw extruders Right:
Coperion’s ZSK 58 Mc18 compact is designed for easier opera- tion and faster installation
launched at K2000 (the 18 indicates a specific torque of 18 Nm/cm³). The new compact design, which was demon- strated in a 58mm diameter version, features a number of improvements to simplify installation and operation. Compact series machines are fitted
with fully prewired control systems, which means they can be put into operation very quickly after delivery. Construction height has been reduced and the control cabinet design cleaned up, while accessibility to the process section has been improved with the cable ducts now arranged beneath it. The drive cabinet is separately mounted to reduce both the installation space and weight of the machine and the feed hopper employs quick-release clamps. The control system is Coperion’s user-friendly Cspro (it has been using the CSpro medium control system in its ZSK high performance extruders since 2010). The CSpro medium system enables condition of the plant to be visualised via a web browser over a network and supports display of information on smartphones and tablets. “CSpro medium is ideally suited to the require- ments of Industry 4.0,” the company says.
Small lot options Entek recently introduced its QC3
-33MM twin screw
compounding extruder, which is designed for small- size lots or to fill the gap between lab and production. The new model includes all of the company’s latest QC3 (Quick-Change, Quick-Clean, and Quality Control) features, which were originally introduced on the QC3
NPE 2015. Entek President Kirk Hanawalt says the company’s
existing 27MM extruder is excellent for lab environ- ments, while the 43MM is designed for small to
medium-sized lots of compounds. “We were getting a lot of requests from customers for something in-be- tween – a machine specifically designed for small lots, but with more output than the lab machine,” he says. New mechanical design features incorporated into -33MM include self-aligning and keyed
the Entek QC3
screw-gearbox couplings to facilitate fast and fool-proof installation of screws; a lock and key feature on splined shafts to prevent screw timing errors; quick-change strand die; easily removable but robust barrel shroud; and tool holders located close to the point of use. The machine also uses control technology designed to provide optimum steady-state performance possible through the use of software that will keep the machine running except when operating conditions exceed defined customer-specified limits or when the safety of the operator or the equipment is at risk. Polimer Teknik exhibited a Poex T40 twin screw
-43MM co-rotating twin-screw extruder launched at
extruder at K2016 for production of specialty polyure- thane masterbatches. The machine was equipped with a new die head designed to provide rapidly cleaning and colour changing.
Fibre feeding Sales and Marketing Director Reha Yelken says the company has also been focusing on feeding continuous glass rovings to produce glass fibre reinforced plastic compounds. It has been working on two approaches: direct feeding of rovings into the extruder from bobbins pulled by the rotation of the screw shaft and indirect feeding using a Chopcot chopper from Van Der Mast. In the direct feeding system, fibre input rates are
The ZSE 35 iMAXX from Leistritz is pitched at masterbatch production
48 COMPOUNDING WORLD | March 2017
calculated by weight loss using load cells supporting the bobbins. This determines the set points for the poly- mer and additives. With the indirect feeding arrange- ment, chopped fibres enter the extruder via a side feeder and a loss-in-weight control system manages the speed of the chopper motor. The Chopcot unit can also vary fibre lengths. Yelken says the company has developed a special feeding section for the extruder screws for both feeding systems.
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