MACHINERY | LAB EXTRUDERS
Right: At NPE, Collin showed a Lab Line machine that makes two- layer flat film
extruder and can use conventional plastic granules. The co-extrusion model is available in three- and five-layer versions.
Twin benefit Anton Paar recently launched its Brabender- branded lab- and pilot-scale twin-screw extruders. It says the TwinLab series has various configura- tions to process everything from liquids to pellets – helping to streamline material testing for lab- and pilot-scale setups and optimise the extrusion process. The company says the equipment can help to gain a deeper understanding of materials, as they provide comprehensive diagrams with recorded measurement parameters. This allows every step of the process to be tracked and recorded – for full traceability. In addition, MetaBridge operating software
ensures intuitive device control paired with features such as data analytics, allowing access to data from many devices. The modular versions of the TwinLab products are powered by the MetaStation drive unit. With the help of additional attachments, they offer single-screw extrusion as well as batch-wise mixing.
Flexible test Scientists at the Fraunhofer Institute for Process Engineering and Packaging (IVV) have developed a new test method to evaluate the machinability of flexible packaging materials. This is essential for efficient, safe processing, say
the researchers – with realistic assessment of the dynamic coefficient of friction being especially important when switching to recyclable materials. This depends – among other things – on the relative speed of the packaging material against the tool surface. According to current standards, existing tests are only carried out at low speeds, so are at odds with real conditions of processing and packaging machines.
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“To counteract this, we have developed a new,
realistic test method to determine the real coeffi- cient of friction,” said the researchers. The research is part of the Wipano project, which has been converted into a standard (VDMA standard sheet). A demonstrator was developed based on the principle of the Euler-Eytelwein formula for characterising rope friction. The test method has been modified so that the packing material is pulled over a tool. This allows the real load condi- tions from an industrial machine to be reproduced on a laboratory scale. Measurements are taken directly from the roll of
packaging material, meaning that sample cuts are no longer needed. This also enables endurance tests – to examine the service life of a coating, for example – as well as investigations into the influence of the tooling material and surface, and the wrap angle.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.collin-solutions.com �
www.labtechengineering.com �
www.anton-paar.com �
www.ivv.fraunhofer.de
IMAGE: COLLIN
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