machinery | Twin screw extruders Right: The latest curved
strand die from Feddem can accommodate
up to 25% more strand holes
material leakage in the sealing face area due to different thermal expansion of liner and outer body,” claims a KraussMaffei Berstorff spokesperson. “Combined with an increased number of cartridge heaters, a cooling bore arrangement optimised in terms of pressure losses, and an improved overall heating/cooling installa- tion based on energy-efficient circulating pumps, this design provides a cost-effective, economical and resource-saving temperature control solution.” Also upgrading Chinese product and production is
Coperion. It unveiled the latest generation of its STS twin screw extruders at Chinaplas last year (see Compound- ing World March 2015). The new STS Mc11 by Coperion Nanjing at its new 1,300m2
series is made plant (where it
also produces CTE units). The machine features an increase in torque from 10 to 11.3 Nm/cm³ and for the first time incorporates Coperion’s ZSK MEGAcompound- er technology for high output production. Coperion fits its Chinese-assembled machines with European gearboxes. The STS Mc11
series is equipped
with newly-designed Coperion-branded European gearboxes, which will also be used in the medium torque version of the ZSK series. Coperion says the gearbox redesign project was initiated and driven by its own experts together with “well-known” European suppliers. To increase stiffness during operation at the higher torque of 11.3 Nm/cm³, the STS Mc11
series is built
around a new base frame designed to dampen vibrations and ensure smooth operation, increasing operational safety and helping provide long system service life.
Right: Feddem’s FSB side-feeder and FSV lateral vacuum
degassing unit share the same mounting frame for fast
changeover
Growing system demands At Leistritz Extrusionstechnik, managing director Sven Wolf says the company has “evolved from an extruder manufacturer to a competent system supplier.” Last year, Leistritz completed the largest compounding plant project in its history: a €14 million project with an hourly throughput of eight tonnes handling polypropylene produced by Neftekhim in Pavlodar, Kazakh- stan. Project partner AZO was responsible for the material handling system. In the Neftekhim project, raw
polymer powder from the reactor is transported in a nitrogen atmosphere over a distance of
30 COMPOUNDING WORLD | March 2016
approximately 350 meters to the extruder, where it is stabilized to prevent auto-oxidation. The plant is configured around a ZSE 180 MAXX twin screw extruder with an OD/ID of 1.66 and a specific torque of 15 Nm/cm³. During the extrusion process, the viscosity of the stabilized polypropylene can be
precisely adjusted. The resin viscosity is
measured using an online rheometer, then adjusted by the addition of a peroxide masterbatch using a specific controller, which is integrated in the Leistritz control unit. To further help optimise its formulations, Neftekh- im also invested in a lab line with a Leistritz ZSE 27 MAXX twin screw extruder. Turkey’s Polimer Technics has been focusing its
recent development efforts in the areas of recycling and biopolymers, according to Sales and Marketing Director Reha Yelken. He said the Poex T94 recompounding system is designed for reprocessing of waste plastics to pellets and is intended to provide a one-stage alterna- tive to the classic two stage approach of first recycling and then compounding the waste material. Yelken says the Poex T94 Recompounding Twin Screw system is built around a 48 L/D extruder with a single side feeder designed specifically to handle low density waste plastic. The system is designed for production of filled
compounds based on waste plastic feedstock. It features segmented abrasion resistant screws with an OD/ID ratio of 1.70 – optimised for effective mineral filling, and uses the company’s patented fixed solid- shell barrel (the latter incorporating core hardened 4D PM high abrasion resistance). Three vacuum ports are included. According to Yelken, the system is able to produce a highly homogenous mix even when process- ing waste polymer with different melt flow index values. In the bioplastics area, Polimer Technics has
developed the Poex Bio-Polymer line for production of starch-based polymers. These systems feature two liquid injection feeders and one side feeder. The systems use the company’s segmented screw design modular 4D barrels, which enable simple replacement of liquid injectors and atmospheric degassers. Yelken says tests have shown the compounding systems
to be well suited for production of 100% biodegradable polymers. Indian machinery maker
Steer says it continues to develop technology to improve compounding efficiency, to
www.compoundingworld.com
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