machinery feature | Twin-screw extruders
ICMA San Giorgio recently
supplied two
turnkey lines to a South
American plant making
appliances
capacity, improved production quality through more aggressive kneading and mixing, and/or reduced polymer temperature with lower screw speed. Tadashi Gion, sales executive and liaison officer at
JSW’s European headquarters in Düsseldorf, Germany, says that the company benefits from being able to refine its own special steel grades. “This is a vital factor in the production process for screws and barrels, where special alloys are a crucial performance enhancing factor,” he explains. The new series comprises seven models, with barrel
diameters ranging from 26.5 to 129.5 mm, and a torque range between 387 and 43,969 Nm per the two shafts. A high-precision torque limiter ensures mechanical and safety protection under operation with highest torque load. An optional water-cooled motor assists in noise reduction.
JSW is currently in advanced development of a more
sophisticated lab extruder, tailor-made for the Euro- pean market. This extruder, the TEX 25α III, will be exhibited at the IPF plastics show in Japan in October. Polimer Technics of Turkey highlights its new Poex HT series of twin-screw extruders as well as its Poex T series. “Specific torque was the biggest feature that we have been studying,” says sales manager Reha Yelken. “As a result of our studies, we have introduced our high torque HT series with 20 Nm/cm3
nominal torque density.
Also, Poex HT co-rotating extruders have high free volume: 1.74 instead of 1.55 in Poex T series extruders.” Yelken also points to the particular design of the bar-
rels on Polimer Technics extruders. Unlike flange-con- nected barrels, these have a fixed solid shell and modular liners to provide easy usage as well as providing high wear protection with a new special steel. Cited advantages of this barrel construction include
Leistritz’s new ZSE-87 Maxx heavy-duty extruder is designed to process highly-filled compounds
ease of assembly, disassembly, and cleaning, plus zero need for extra equipment to change or repair. Yelken also points to an “optimum” combination of liquid cooling and electrical heating: each zone has its own heating/cooling system. Several developments being unveiled by Century at NPE 2015 include a new series of machines with very high torque density—nominally 18 Nm/cm3
achieved this with what Charles Spearing, general manager of the company’s global twin-screw opera-
tions, describes as an aggressive development of the shaft over the past two years. The shaft is produced using maraging steel, a refined cold forming process for integrating the splines into the shafts to increase overall strength, and a proprietary heat treatment process. Century is unveiling the 70-mm version of the 18+ machine at NPE. Spearing says that it has already been sold to a leading global compounds producer. Also new is a 105-mm high-torque compounder
. Century has
capable of outputs of close to 7 tonnes/hour. “We needed a machine to sit between our 92-mm and 133-mm models, because there is a huge capacity difference between these two,” says Spearing. In fact, capacity of the 105-mm model is 50% higher than the 92-mm model. “It has an incredible cost-to-throughput ratio,” he adds. Spearing also highlights a “significant” development of Century’s systems capabilities. “Not so long ago, we were known only as a unit machine supplier,” he says. “We have put a lot of effort into the internal develop- ment of process automation, project management and 3D design. Customers can now benefit from having a single source for all content, from ingredient handling through to packaging.” Century has also
been working on prewired system modules, configured
36 COMPOUNDING WORLD | March 2015
www.compoundingworld.com
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