MACHINERY | TWIN SCREW EXTRUDERS
user with easy access to data visualisation, but also allows its company experts to remotely access raw data for the purpose of further investigations on possible vibration issues. “The system was designed to be the perfect
Right: JSW has updated its TKD screw element
design to lift performance
match for small and mid-sized machines targeting the reduction of unplanned down times and severe damage. It can also be extended to, for example, provide condition monitoring of the driveshaft bearings,” the company says.
Simplified service Another recent Coperion develop- ment concerns the maintenance opening to the gearbox lantern – the enclosure around the connec- tion between the gearbox and the extruder screws shafts. The company’s ZSK twin screw extrud- ers can now be optionally equipped with an electronic locking system so that, as soon as the screw shafts come to a complete stop, service personnel can open the lantern to gain safe yet secure, tool-free access to the screw shaft coupling. The company says the feature, which is available on models from the ZSK 32 upwards, significantly simplifies screw changes and maintenance, reduces downtimes and improves overall efficiency of the system. Turkey’s Polimer Teknik offers its Poex T60-HT,
Below: The Poex T75-HT from Polimer Teknik is designed to handle heavily-filled polyolefins
T75-HT, and T94-HT series extruders for production of polyolefin-based compounds with mineral filler levels of up to 83% and says it has produced four lines based on the Poex T75-HT series over the past year. The compounds produced on the lines are used in production of blown film for applications including carrier bags, sacks, and construction film. The company says that the type and number of degassing units are of particular importance for
these applications. “The introduction of fillers automatically involves the inclusion of air between the particles, which is eliminated from the processing chamber by means of three atmospheric degassing systems and one vacuum degassing unit,” it says. Polimer Teknik also recently designed and supplied an explosion-proof line that is certificated in accordance with the EU ATEX Directive 2014/34/EU. “All potential risks have been avoided with special design and special components,” it says. A feature of the process zone
IMAGE: JSW
of the company’s larger twin-screw extruders (Poex T40, T50, T60, T75 and T94 models) is the use of a modular design with liner insert. “These modular systems enable easy assembly and disassembly, easy cleaning and maintenance, excellent heat transfer by liquid cooling and electrically heating in
the control loop of the temperature device,” the company claims. Each zone has its own heating and cooling system to provide users with a high level of flexibility in operation.
Screw developments Japanese machinery maker JSW has modified its TKD (Twist Kneading Disc) screw design to improve output. The twist angle of the kneading tips on the TKD screw, which was first developed by the company some 20 years ago, is said to prevent local high shear and heating and minimise local pressure peaks. As a result, JSW says it enables mixing with reduced energy consumption; pro- cessing at lower melt temperatures; improved dispersion of fillers; and reduced risk of wear of barrels and screw elements. “Last year, we developed the improved TKD and
realised the increase of throughput by 1.8 times with a customer which is one of the Japanese largest compounders,” says Hayato Hobo, part of JSW’s European team based in Düsseldorf, Germany.
IMAGE: POLIMER TEKNIK
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.bausano.com �
www.feddem.com �
www.icmasg.it �
www.comacplast.com �
www.extruders.leistritz.com/en/start �
www.mas-austria.com �
www.entek.com �
www.coperion.com �
www.polimerteknik.com �
www.jsw.co.jp
22 COMPOUNDING WORLD | March 2021
www.compoundingworld.com
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