TECHNOLOGY | RECYCLING
of 200-250 RPM, processors of brittle materials such as glass-fibre reinforced plastics primarily rely on low-speed granulators. “These processors have, until now, been limited to running their granulators at 25 RPM, regardless of the specific material that they are processing,” it says. At K2019, Rapid CEO Bengt Rimark (who
left the company after the show to pursue new opportu- nities) said: “Rapid is the leader in granulation and we wanted to know why the standard 25 RPM for slow speed granulators had never been questioned. This is why we started tests to optimise the speed according to specific plastic material characteristics. This has resulted in OneCut Pro, the best of three worlds – less noise, less dust and less energy consumption.” There is an almost 100% percent correlation between speed and energy consumption, Rimark noted. “If we reduce the speed by 40%, we have also reduced the energy consumption by up to 30%.” Running the new machine at a lower speed of 15 RPM helps to improve the quality of ground, highly brittle materials through minimising dust generation. But there are noise reduction advan- tages too, as noise levels correlate closely with cutting speed. By reducing rotation speeds from
Right: CMG’s new AMP function constantly monitors the torque applied to the rotor shaft enabling the level of power that is suited to the work
Rapid’s OneCut Pro slow speed granulator
25 RPM to 15 RPM, noise levels can be reduced in many applications by 3-5 dB, Rapid says. This means about a 50% reduction in actual noise pressure on the ears.
Rimark also highlighted the advantages of the QRR system. “One of the biggest disadvantages of slow speed granulators when compared to knife granulators is the gearbox design, which makes the rotor very difficult to turn by hand,” he said. “Quick Rotor Release allows the operator to easily discon- nect the whole gearbox from the rotor so they can easily clean the machine for the next feed. When the gearbox is disconnected the whole cutter house can be opened up.” The OneCut Pro also has a feature called
EnergySmart, which allows the operator to stop the machine when accumulating materials, rather than having it run continuously.
Adaptive motor At CMG, Giorgio Santella, General Manager Sales & Marketing, points out that all the company’s recycling equipment features the new Adaptive Motor Power function, which he says is unique in the size reduction sector. (AMP also features on some Piovan granulators, but this is because they are built by CMG; Piovan has a 20% holding in CMG). AMP is claimed to provide energy efficiency, dimensional homogeneity of the regrind particle, absence of dust, longer blade life, overall wear reduced to a minimum. Santella explains that the granulator constantly monitors the torque applied to the rotor shaft and is able to independently determine which level of power to adopt to carry out its work, based on quantity of material to be ground, size, shape,
24 INJECTION WORLD | March 2020
www.injectionworld.com
IMAGE: CMG
IMAGE: RAPID GRANULATOR
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