MACHINERY | SCREWS AND BARRELS
Figures 2 and 3: Comparison of the pressure gradient across the mixing screw using Feddem’s FME mixing elements (left image) and conventional kneading blocks (right image). A higher average pressure drop results in higher distributive mixing performance
Source: Feddem Coperion says the C-Rock coating technology is
particularly suitable for the compounding of PA, PBT, PP and high temperature plastics with glass and carbon fibres, and with ceramic or metal powders. The 1.5mm thick coating offers very good adhesion to the substrate metal and is intended for use on closed standard barrels on Coperion’s ZSK 70 and ZSK 92 twin-screw extruder models. It can be applied directly to new barrels or liners, although retrofitting of liner barrels with C-Rock is also possible.
Modified steels Germany-based Extruder Experts, which manufac- tures a wide range of wear components for twin screw extrusion equipment, has introduced nitrogen-modified steels (such as 1.4108 grade) to achieve a hardness of 58 HRc together with the good corrosion resistance and ductility required for twin-screw extruders. According to Dirk Zimmer- mann, General Manager of the company, this family of steels overcomes known limits in ‘normal’ screw segment materials, which he says either display good hardness with low corrosion resistance and poor ductility or good corrosion resistance and ductility but limited hardness. Zimmermann says that the company is also
currently working on a novel screw shaft design for twin screw extruders, which is designed to offer significant benefits in the compounding process. These developments are planned for introduction later this year.
German twin-screw extruder manufacturer
Feddem is collaborating with Ianus-Simulation to develop new calculation methods to optimise screw elements for the compounding process. “Newly developed compounds require further improvements in screw elements and configura-
58 COMPOUNDING WORLD | August 2021
tions. In order to reduce the testing required or to even proceed without tests, a reliable calculation of the expected operating parameters with new or modified screw elements is a great advantage,” says Klaus Hojer, Business Development Manager. “Traditional calculations of energy consumption,
pressure curves and mixing quality only offer limited precision. In cooperation with Ianus-Simula- tion, we are developing a calculation method that accurately demonstrates the advantages of Feddem screw elements in terms of reduced energy consumption and lower increase in melt temperature, for example,” he says. Feddem’s FME mixing blocks provide an alterna- tive to conventional kneading blocks with claimed advantages including lower specific energy input and more gentle treatment of the compounding. Simulations from the work with Ianus (Figures 2 and 3) are said to show the better distributive mixing of FME mixing elements induced by a higher drop in melt pressure compared to kneading blocks.
New location KraussMaffei group company Burgsmüller – a specialist in extruder spare parts that manufactures some 40,000 screw elements annually — has completed construction of its new production site at Einbeck in Germany. The company says the relocation will enhance its competitiveness and support future growth. Due to the increased plant area, all processes – from order intake right through to shipping the finished parts – can be optimised and streamlined. The significantly enlarged produc- tion area of the new site also allows for further expansion while the building structure contributes to significant ly improved internal workflows. India-based compounding machinery maker
www.compoundingworld.com
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