MACHINERY | TWIN-SCREW EXTRUDERS


Right: The Poex T60HT from Polimer Teknik provides a torque density of 16 Nm/cm3


and a maximum speed of 900rpm capable of providing a high torque density of 16 Nm/cm3


. The company says this design


provides 50% more capacity than the standard T60 series, which provides 12 Nm/ cm3


torque density. In this new application, the extruder is equipped with two side feeders to enable addition of a variety of fillers. The line uses Brabender gravimetric feeders, each handling up to four components, while the strands are cooled in a water bath and dried with a suction dewatering system. The bath and dewater- ing systems are both built by the company, as are the accompanying strand pelletiser and vibrating screen. Polimer Teknik says the strand die was developed by its engineers to ensure stable strand flow and uniform pellet shape.


Output capacity for the line running a 30% glass


Right: JSW’s V-kneading elements incorporate grooves to intensify melt flow at the tip


fibre reinforced PA is up to 1,300 kg/h. The com- pany says it will show a smaller Poex T40HT extruder with the same high torque density at the K2022 trade fair in Dusseldorf in Germany in October of this year.


Below: ICMA purpose-built this extruder with slide- away barrel for processing of fluoropolymers


Easy opening Italy’s ICMA San Giorgio says it recently completed two highly customised co-rotating twin-screw extruders for customers producing specialty high value compounds. The first unit, intended for production of high-performance electrical cable compounds, features a special maximum access barrel opening system. This was required in this application because the material is highly heat-sensi- tive and requires an extreme clean of both cylinder and screws at the end of each production cycle. The company’s opening solution makes the


entire surface of the barrel and the two screws fully inspectable and cleanable. ICMA says it is a sophisticated and refined technical solution that


IMAGE: ICMA SAN GIORGIO


IMAGE: POLYMER TEKNIK


means additional cost. However, it says it has proved to be particularly efficient in specific high added value processing applications where the risk of contamination is elevated and the self-cleaning capacity typical of the co-rotating system is not sufficient for the purpose. The second extruder, intended for a customer processing fluoropolymers, employs a different barrel opening arrangement with a “sliding” movement. Again, it enables complete inspection and cleaning of the screws and the barrel surfaces. In this application, the extruder operates at high process temperatures and the steels used are selected to ensure maximum


resistance to corrosion. Japanese compounding equipment maker JSW has developed a new


kneading element for its TEX twin screw extruder. Named the V-kneading element, it


features a V-shaped flight tip that forces the polymer flows to merge into one, so creating high localised pressure and increasing the polymer flow passing through the tip clearance area. The com- pany says this makes it possible to achieve better dispersion performance compared to a convention- al kneading element. According to JSW, recent experiments have shown that the V-kneading has conveying and distributive mixing performance similar to conven- tional kneading elements. “Its behaviour is simple and predictable, and no special technique or philoso- phy [is] required to utilise it,” the company says. The V-kneading element can be applied to a


variety of processes, from general compounding and polymer alloys to reactive processes. JSW says it already delivered V-kneading prototypes to several customers during 2021 and says feedback has been positive. Elements are now available for customer trials and rental purposes. At India-based Steer, Managing Director and Chief Knowledge Officer Babu Padmanabhan says


18 COMPOUNDING WORLD | March 2022 www.compoundingworld.com


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