machinery feature | Granulators
Hellweg says that its new granulator
works on the peeling cutting principle
shredder rotor and cutter chamber, to simplify cleaning and servicing. The front door, hinged on the side, gives easy access to the rotor and screen, which is mounted in the door. Once the door is open, the shredder hopper mounted on a rear hinge can be tilted back.# Rapid offers 36 base configurations of
the Raptor in order to handle various customer applications. The modular systems feature two diameters and two widths – 31.5in (800mm) and 53in (1,350mm). “The Raptor series is a shredder
and granulator hybrid with the shredder’s heavy-duty cutting technology combined with granulator features that make it easy to operate, service and clean,” said Bengt Rimark, sales and marketing director. There are two system designs for pushing material
Neue Herbold has developed a force feeding technique to boost granula- tor throughput
into the rotor – FlexiPush and PowerPush. PowerPush is available with an extended pusher length (Power- Push-XT). The FlexiPush is a pneumatically driven pusher for handling basic applications, including lumpy materials. It can handle large products such as a 1,200 litre IBC, for example. The hydraulically powered PowerPush maximises output for shredding sheet and film. The cutting chamber features a textured floor to reduce the risk of material adhering or finding its way under the pusher and is offset by 5 degrees to enable liquids to drain away. There are also three cutting systems: Quad Cut, Claw, and Power Wedge. The QuadCut cutting system for general plastic waste features a solid knife that allows full use of all four cutting edges. The cutting system is durable and has a solid clamping system attaching the knife to the rotor. The knives are supported by a sacrificial washer in order to protect the rotor should non-plastic material acciden- tally enter the cutting chamber.
Grinding it out Moretto offers a range of products aimed at the needs of the grinding sector. The GR grinder series has been developed in different versions for
different applications, including uniblade, multiblade, anti-wear, cooled, raised, and soundproof. Each is characterised by a low noise profile and includes a range of accessories such as:
34 PIPE & PROFILE EXTRUSION | April 2017
cyclone, collection drawer, injector for proportional valve and an inclined screw. Each unit is insulated and provided with a large inspection window above the grinding chamber. A funnel inlet for robot integration is supplied as standard. The reversibility of the hopper allows the machine to be configured according to requirements. The shape has been carefully studied to prevent any regrind overflow. The grinding chamber is the heart of the machine: the design is linear without any roughness and its cutting angle is very high. The inclined blades provide a scissor effect cut, which increases the efficiency with a dust-free regrind material, says Moretto. A rotor speed regulator
distinguishes the Variant series. A proper device allows rotor speed to be reduced for grinding soft materials such as polyethylene and polypropylene. The adaptable blade rotation speed is effective for soft materials such as medical PVC. The Eco range has integral soundproofing
construction. These machines, with a large grinding capacity, are built to withstand heavy-duty applica- tions. They are equipped with three and five blade rotors with scissors-effect. The GR Eco series can be inspected without using tools. The hopper can be opened with electrical control.
Force feeding To increase the throughput of granulators used for size reduction of loose, unpressed plastics, Neue Herbold has developed a force feeding technique. Material is fed to the feed hopper via a screw convey-
or. Transport to the grinding chamber is now no longer based only on the principle of gravitation – as the material is now fed to the grinding chamber by one or more vertically assembled screws. The number of screws, rotation speed and drive
capacity can all be varied, depending on the required granulator size. A transport screw equipped with a load-dependent control and frequency converter prevents a rotor blockage caused by material accumu- lation. This results in a throughput rate that is ideal for the processed material. The wear-protected design of the transport screw guarantees long lasting operation, says the company. The feed hopper has a worm gear shaft, enabling a continuous material feed and preventing material
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