PURGING COMPOUNDS | PROCESSING
mainly in the engineering plastics sector, he says the company has now taken the step of adding a new product range to the montan waxes. “With the Cevo portfolio, we offer ready-to-use additive formulations with components that create synergis- tic effects, providing complete solutions designed for specific polymers. They can also be specifically tailored to individual customer needs. The majority of Cevo developments are wax additives that can solve specific processing problems in the engi- neering plastics area. However, recently this has also included a purging concentrate.” According to Völpker, Cevo-clean J-1819 is a
highly efficient cleaning concentrate for thorough and user-friendly cleaning of extruders. It combines a chemical-physical mode of action which uses solid solvents and non-abrasive minerals that have been optimally-selected to work with each other. It is said to remove stubborn deposits, burns and material residues of all commonly used thermo- plastics. Barrels and screws are subjected to gentle mechanical cleaning, including the dead zones of machines, and the compound can be used up to 360°C, depending on the carrier polymer. The company says Cevo-clean J-1819 is a
‘one-for-all’ concentrate suitable for nearly all commonly used thermoplastics, which makes it particularly cost-effective. In use, it is always diluted with the polymer to be used next, which is said to enable materials and colours to be changed quickly and resulting in less downtime and lower reject costs. Where contamination levels are low, the cleaning extrudate can be granulated and reused. Cevo-clean J-1819 is used as a dry blend of 20-25 parts concentrate to 75-80 parts of unfilled polymer. The mixture is processed on the extruder using the normal processing parameters of the polymer used and ,after cleaning and rinsing, new production can begin immediately.
Transparent results Test carried out at the Kunststoff-Zentrum in Leipzig, Germany, demonstrate that Cevo-clean J-1819 is particularly good for effective purging in demanding applications, such as transparent materials. These were conducted with PMMA including an intense blue masterbatch at a 2% addition level. The extruder mixing the compound and masterbatch and the injection moulding
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Polymers in Flooring
9-10 December 2021 Berlin, Germany
Discovering the latest trends and innovations in polymer flooring, improving materials, production and design to open new markets
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