At K 2019 at low speed

Less dust, less noise, less energy consumption. These are the main operational benefits of the OneCUT PRO low speed granulator, unveiled by Rapid at K 2019, where four models are exhibited in operation. OneCUT PRO allows injection moulded plastic processors to adjust the rpm range when granulating at a slow speed from the standard 25 rpm to a bandwidth of 15-35 rpm (plus/minus 40% rotor speed), for optimal quality regrind.

With the vast majority of processors running at under capacity, the new machine, which uses the new Rapid FlexiSpeed system, means less dust, less noise and significantly less energy consumption. For processors facing capacity limitations, operating at a higher speed level will allow them to overcome capacity constraints, boosting operational output. The torque level of the machine is maintained, regardless of the speed at which it is running. Further benefits of the new machine include the operator-friendly “Open Hearted” design through the patent pending QRR (Quick Rotor Release) system and the use of an innovative energy saving technology.

While knife granulators are conventionally used for granulating softer materials and run at a speed of 200-250 rpm, processors of brittle materials such as glass-fibre reinforced plastics primarily rely on slow 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.

Running the new machine at a lower speed of 15 rpm helps to improve the quality of ground highly brittle materials through minimizing dust generation. But there are noise reduction advantages too, as noise levels correlate closely with cutting speed. By reducing rotation speeds from 25 rpm to 15 rpm, noise levels can be reduced in many applications by 3-5 dba. This means about a 50% reduction in actual noise pressure on the ears of factory workers.

A further advantage for low speed operation is the energy saving boost. There is an almost 100% percent correlation between speed and energy consumption. Reducing the speed by 40%, the energy consumption is reduced by up to 30%. For operators wishing to run the machine at a higher speed, moving from 25 rpm to 35 rpm, will allow them to increase the capacity with 30-40% in the granulator.

Besides the flexibility and improved granular quality, OneCUT PRO brings great operational benefits too. 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. What Rapid has done for this machine is introduce the QRR (Quick Rotor Release), which allows the operator to easily disconnect 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, providing the Rapid’s unique Open Hearted design, that drastically simplifies cleaning, service and preventive maintenance.

A further advantage of OneCUT PRO is the implementation of EnergySmart, a new system that can lead to an about 80% percent reduction in energy consumption. This function allows the operator to stop the machine from running when accumulating materials, rather than having it run continuously. With Rapid Stop & GO mode, the granulator will stop and go in intervals, so there is zero energy consumption and no noise during pause mode. When EnergySMART is implemented together with running the machine at a rotor speed of 15 rpm the maximized energy saving is reached.

At K 2019, Rapid Granulator has four of these new machines running at its booth, as well as highlighting the next generations of their ThermoPRO and the shredder line Raptor DUO machines. ThermoPRO machines are a new range of granulators specifically designed for in-line processing of skeletal waste from sheet and film thermoforming lines. The ThermoPRO is equipped with a brand-new heavy duty rollerfeed system that also can handle the start-up cups up to 200 mm height in the web, eliminating any extra labour costs and material waste. ThemoPRO with integrated loop control is made in super sound proof execution in order to operate at noise levels below 80dBA. Rapid Granulator currently offers 15 different base configuration machines, depending on customer requirements.