MACHINERY | PELLETISERS
of key process parameters, says Business Development Manager Frank Asmuss. Highly filled compounds can lead to high
IMAGE: NORDSON
Above: Nordson’s BKG Optigon water filtration system eliminates fines from underwater pelletising systems
chance that it could bounce around the cutting chamber and be cut twice,” explains Forgash. Pellets are then conveyed to a separate area
where any remaining dust, or any dust generated after the cut, can be removed with a secondary dedusting cyclone. “This cyclone uses a proprietary ratio of counterflow air in the right areas to remove a controllable amount of unwanted materials sizes from the end product as it is spread thinly in the dedust phase,” he says. Fines are also a concern in underwater pelletising. “Significant fines generation decreases the end-product quality and increases maintenance efforts,” says Ralf Simon, Director, Special Projects at Nordson. The company addresses this issue with its BKG Optigon automated water filtration system, which incorporates a self-cleaning Polygon filter that is cleaned automatically depending on the differential pressure in the water tank. Another challenge for compounders is handling
materials with high residual moisture. Nordson offers multiple solutions for this challenge, including high efficiency dryer designs to achieve the desired moisture levels, die plates with optimised insulation, flexible bypass systems that can control residence time, and automated control
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pressures that are also challenging for the pelletising process. Nordson offers its BKG melt pumps, which feature adapted clearances for pressure build-up, and carefully designed die plates with precise and material-adapted borings to overcome this challenge, according to Asmuss. Fillers and other abrasive additives cause wear, which can be managed using protective coatings and metallurgy at the die plate. Another solution is automatic blade adjustment, which provides constant compensation for wear, as well as inline grinding tools that provide automated grinding of the die plate to increase the lifetime of plate and blades.
Recycling demands Processing of reyclates is becoming increasingly commonplace. It places additional demands on the compounding and pelletising process as the incoming material tends to be more variable and more contaminated than virgin polymer. Asmuss says Nordson’s BKG HiCon V-Type 3G system melt filter uses a power-backflush technology that provides an effective backflush with minimal losses. “Even with an efficient backflush screen changer,
the screens will be quickly blocked with contaminants so screen changes are required more often than in other applications. As every screen change comes together with a pressure loss, even if it is a slight one, a booster pump might be required between screen changer and pelletiser,” he says. “Nordson’s BKG gear pumps ensure a constant process pressure so that the melt stream that is fed into the pelletising system is even and smooth, which is key to a high-quality end-product.” Austrian pelletiser maker Econ is also focusing on high level automation. Its ECONia fully
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