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TECHNOLOGY | GRANULATORS


frequency converter prevents a rotor blockage caused by material accumulation. This results in a throughput rate which is ideal for the processed material. The wear protected design of the trans- port screw guarantees long-lasting operation. The company says that this feeding method


Above: Weima and Neue Herbold have collaborated in the two-stage processing of plastic waste – shredding and granulation


Right: Neue Herbold has developed a force-feeding device for granulators


larly fine particle sizes. In cooperation with the granulator specialist and long-standing partner, Neue Herbold, Weima has already implemented many joint customer solutions. Shredders from Weima can be precisely operated and controlled via Siemens PLC control. They have common interfaces (such as PROFIBUS or PROFINET) and can be optimally integrated into existing produc- tion systems. This also includes peripherals such as extraction, metal detection and secondary crushers. This optimises the use of downstream production machines (such as washers and extruders) and increases the efficiency of the recycling line. Neue Herbold has developed a new feeding device for granulators. To increase the throughput rate of a granulator used for size reduction of loose, unpressed plastics, a force-feeding technique has been developed. A screw con- veyor is used for technically opti- mised material feed. The material is fed in the feed hopper via a conveyor. The transport to the grinding chamber is now no longer only based on gravity – in fact the material is now fed to the grinding chamber by one or more vertically assembled screws. Depending on the required granulator size, the number of screws, rotation speed and drive capacity can vary. A transport screw equipped with load- dependent control as well as a


64 PLASTICS RECYCLING WORLD | September 2021


offers a number of advantages. These include a wide range of application areas, such as plastics bottles, canisters, packing materials from food production, as well as all thin-walled hollow containers. The feed hopper is equipped with a worm gear shaft which enables a continuous material feed and prevents material swerve at the same time, which results in a throughput increase of up to 30%. Increased efficiency results from the accurate and constant material feed that leads to ideal utilisation of the rotor capacity and supports the efficiency of the entire plant. Furthermore, the material fly-out from the feed hopper is reduced which leads to complete processing of the entire material fed to the system. There is increased material feed due to the continuous size reduction of the material, the feed hopper is ready to receive large amounts of material. Compared with a standard granulator feed, a material blockage in the hopper is almost impossible, meaning that input capacity is maxim- ised. There are also decreased sound and power peaks. The controlled material feed guarantees a constant, smooth rotor operation and therefore reduces sound peaks, which could occur by overfeeding. This constant material feed also prevents power peaks during the operation of the machine.


Customisation of granulators is an increasing trend in plastics recycling, reports Conair. “The basic design and functionality of Conair Viper granulators have not changed appreciably since they were introduced at NPE 2018,” says Dave Miller, Conair General Manager – Size Reduction. “However, what does change constantly is how our customers use them and how we are able to customise the grinder for specific installations.” He points to a custom- er with a captive moulding operation, where five Viper Model 1220 granulators were recently installed in a central grinding room. Scrap


www.plasticsrecyclingworld.com


IMAGE: WEIMA


IMAGE: NEUE HERBOLD


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