MACHINERY | LABORATORY COMPOUNDERS
used simultaneously on the machine. To demonstrate the advantages of side feeding, the company ran two compounding trials using a low bulk density wood fibre filler. Extrusion conditions were kept the same but the means of feeding changed between secondary top feeding and side feeding set-ups and the results compared. The trials involved feeding 0.8 kg/h of polypro- pylene pellets in feed port 1 using a gravimetric single-screw feeder. In the first trial, secondary top feeding of wood fibre was undertaken using a gravimetric twin-screw feeder at feed port 4, while in the second trial secondary side feeding of wood fibre was made from the backside of the barrel between ports 3 and 4. In the top-feeding trial, the port clogged when throughput of wood fibre exceeded 0.2 kg/h. In the side feeding set-up, the feed rate of wood fibre could be increased up to 1.5 kg/h before the extrusion process reached its torque and pressure limit. Coperion is seeing the emergence of a number
of specific markets where laboratory scale com- pounding technology is increasingly in demand. “In addition to applications such as engineering plastics, these are markets in which a great deal of
development work is currently being done,” says Markus Fiedler, Process Technology, Team Leader of Chemical Applications. “This includes the further development of the manufacturing process for fuel cells. As part of the research project GrabaT (Graphite-based Bipolar plate Technologies), Coperion is currently working with the University of Stuttgart’s Institute for Plastics Technology (IKT), Robert Bosch and Matthews International/Saueressig, on the continued devel- opment of proton exchange membrane (PEM) fuel cells. Bipolar plates as a core element of fuel cell stacks, and in particular their thermoplastic graphite compound-based implementations, are the focus of this work,” he says. “Coperion has set itself the task to transfer all
the experience gained in its years of feed-limited plastics compound manufacturing to the prepara- tion of mixtures consisting of high amounts of graphite and low amounts of polymer. The Coperi- on ZSK twin-screw extruder is used to improve the addition of fillers to the polymer and to avoid creating agglomerates and degrading the polymer during compounding. The results obtained on a laboratory scale are the basis for future upscaling,”
FEDDEM
Laboratory Extruder Best conditions for a scale -up
The FED-MTS extruder is suited to a variety of appli- cations. The modular design of the FED 26 MTS, a co- rotating twin-screw extruder can be extended in just a few simple steps from 32D to 42D, 52D or more.
The FED 26 MTS is ideal as a lab extruder – the technology inside is similar to that of the larger machines in the MTS series and thus provides virtually the same gentle com- pounding processes.
FEDDEM GmbH & Co. KG Member of the Feddersen Group •
info@feddem.com •
https://feddem.com
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