PROCESSING | PURGING COMPOUNDS
Right: Dyna- Purge says its reformulated Leading Technology line offers a 10% efficiency gain
larly strong in clear applications. Asaclean says the material is a particularly good option for com- pounders for basic product changeovers and maintenance; the EX Grade remains the recom- mended option for dealing with contamination issues and screw pulls.
Purging tips Asaclean offers some tips for effective and efficient cleaning of compounding extruders. “Firstly, do not use production resin, regrind or additives to try to purge your extruder,” says Nagaraj. “You also need to ask yourself some questions before choosing a purge. For example, what is the size of the extrud- er? What resins are being run? And what are the processing temperatures?”
It is also necessary to consider the intended
application of the purging compound, as well as the issues that are currently being experienced. “Screw pulls should be optimised by using a grade like EX to ensure safer and faster maintenance. The ma- chine should be sealed with a heat-stable purging compound during every shutdown,” he says. Asaclean has supplied extrusion machine manufacturer CW Brabender with purging com- pounds for many years. CW Brabender President Christoph Pielen says the nature of its application laboratory means running the most exotic material combinations. With a variety of high temperature grade purge compounds available, he says they can clean up the aftermath of trials quickly. The EX glass-filled grade is said to be a particular favourite due to its high scrubbing capabilities, even at high temperatures. Material price pressures driven by the current
market conditions, together with supply-side constraints, mean all processors can gain from better processing practices, according to Dyna- Purge International Business Manager Kelli Ropach. “Hard monetary gains and strategic value can be captured through the regular use of commercial purging compounds (CPC). The economic advantages of CPC use are now exceed- ingly obvious. The longevity of these conditions has motivated many processors to embrace the utility of these products.” Ropach identifies the top trends in the com- pounding and masterbatch area as efficiency, recyclability and sustainability, and says purging compounds need to address these. “Last year, Dyna-Purge responded by reformulating our Leading Technology product line. Upgrading and reformulating a very small but key ingredient unlocked our product’s potential to deliver outstanding results with up to 10% more efficiency
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IMAGE: DYNA-PURGE
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