Clear advantages

The Hellweg angled cut offers decisive advantages compared with the straight cut, the V-cut and the so-called segment cut.

V-cut involves cutting at two points, however this method tends to result in transport of some of the uncut material to the centre of the grinding area, due to the lack of even cutting force. Disadvantage: the material output takes place very much in the centre, which in turn results in uneven wear on the sieve and blades, as well as lower throughput.

Segment-cut is performed in rows by blades offset to each other. This results however in many straight and therefore rather hard cuts, which inevitably leads to a high degree of dust formation. Furthermore, much time tends to be needed for the downtime due to the large amount of blade setting and cleaning work required.

Hellweg angled scissors cut makes a very gentle cut and only at one point. The stator blades, that are also arranged at an angle, take up the cutting force that is anyway light and directed sideways. This guarantees that the material is delivered evenly and over the entire width of the blades and sieve. The decisive advantage for the operator consists of the self-dosing behaviour that is achieved by granulate with an angled cut. This means in practice that the granulators do not become overfull and that they always work in a range close to the maximum throughput of the machine.

Hellweg granulators are characterised by stable and quite operation. The housings of the central mills are welded, those of the machine-side mills assembled with screws and dowel pins.

The machines guarantee fast material intake as well as fast delivery of ground material. Special attention is paid in the design of the grinding enclosure to avoidance of so-called “dead corners“. This enables complete cleaning within a short time, particularly important with frequent colour changes.

The rotor and bearings are understood by Hellweg as being one unit, of which the proportions have to be exactly adapted to each other. Only this way is so-called “calm running“ possible, resulting in sharp edged regrind with a low level of dust.

The stability provided by the machines has furthermore direct influence on the blades’ lifetimes: the less vibration of the cutters arises, the longer the lifetime of the blades. The solid rotor furthermore offers its own high momentum of gyration, whereby it is also possible to use just a low level of drive power.

The construction of the Hellweg cutting mills is sturdy and compact. The generously dimensioned outer bearing recesses are fixed by flanges directly to the grinding enclosure and therefore guarantee highest stability and support for the heavy rotors.

The grinding chamber is opened for example with the aid of a hydraulic pump device or electrically driven hydraulics. The ground material can be alternatively delivered with a standard extendable container or evacuated with the aid of an evacuation device fitting to standard extraction supports.

All central mills are fitted with so-called “shoes“ above the machines’ feet. This way the machines can be quickly picked up and transported by a fork lift truck.

Additional momentum discs produce higher torque and thereby increase the tractive power of the rotors.

Optimum shredding of large and heavy parts is made possible this way, as well as handling of large quantities.

Hellweg machine-side mills can be easily connected to injection moulding machines.

The example on the left shows the 150 series machine attached by flange to an Arburg injection moulding machine. The 80 series cutting mills can be installed directly within an injection moulding machine.

This way, no additional area is needed at the production location.

The design of the intake is made according to specific customer wishes, for example, with material input by sprue picker or via a conveyor belt.

Other possibilities in the design of the intake:

• Intake connection at the injection moulding machine
• Via an additional input shaft
• Sorted and thrown through a rotary valve
• Via a venturi system connection

Hellweg cutting mills produce sharp-edged regrind with low levels of dust that is highly homogenous and without thermal degradation.

This best quality level is an important prerequisite for further processing in high quality.