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Pellet screening | processing feature


Pellet screeners can play a critical role in improving the quality of a compounding plant’s output. We look at a wide range of machinery designed to meet the demands of the most discerning customers


Screening systems that pick the perfect pellets


Your compounding plant may be equipped with state-of-the-art feeding systems, the very latest twin-screw extruders and high-precision pelletizing systems. But there is an additional step of the process that requires an equal amount of attention. Pellet screening systems can


remove over-size, defective pellets such as longs, angel-hair, dumb-bells, tails, twins, triplets, clusters or chains. They can also eliminate fines and dust, leaving just pellets of the correct size and shape. These will ensure that the product leaving your factory will meet the expectations of your most demanding customers. Over the following pages we look at a wide


range of pellet screening equipment from suppliers around the world. They include vibratory sieves, fluid-bed separators and an image-based system that uses a camera to spot faulty pellets, as well as screening devices that incorporate drying and dewatering in the same unit.


Allgaier Process Technology of Germany offers a wide variety of screening systems, including vibratory, tumbler and ultrasonic designs. Its TSM and TSI tumbler screening machines are designed to offer very high screening efficiencies. They employ a special motion pattern to create a helical movement of the particles across the screen to give a relatively long path for a relatively small surface area. The largest machine in the range is the TSI 290 with a screen diameter of almost 3 metres. Allgaier also offers more conventional vibration


screening machines, including its VRS high-value range and the high-throughput Vibrall designs. ❙ www.allgaier.de


www.compoundingworld.com


Coperion of Germany is reporting good progress with its HFS horizontal fluid-bed separator, which was first introduced to the market in 2010. The compact unit is claimed to offer excellent fines separation performance for a wide variety of compounded products. It removes dust or misshaped pellets from the bulk materials prior to packaging or processing, therefore ensuring a high-quality end product. The energy and air consumption of the separator are


claimed to be very low, and standard models are available for throughputs ranging from 800 to 20,000 kg/h. A dosing


May 2012 | COMPOUNDING WORLD 43


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