RECYCLING & GRANULATORS | MACHINERY
At the cutting edge: latest developments in granulators
Recent granulation and recycling developments include a high torque model that minimises thermal degradation, and new systems for reclaiming thermoforming scrap
Recovery of plastic materials has become increas- ingly important, whether in terms of returning offcuts straight back to the production line or for generating recyclate for use in other operations. In each case, efficient re-granulation is the key. Hellweg Maschinenbau, for instance, has
extended its 600 series granulator at the upper end, by adding a model with a 1,500mm working width. The new MDS 1500/600 version offers high
torque due to the high stability of the entire machine housing and the heavy-duty rotor, which is made from a single block of metal and weighs 3,000kg. “Aside from the high performance, the machine has other strengths – such as in flexibility on account of its modular design,” said Mark Hellweg, managing director. “For example, straight or slanted housing versions are available, as well as different rotor and stator designs, in order to address the different tasks required in the market.” The double-slanted scissor type of cutting
ensures that the large granulator can shred articles including thick-walled mouldings and sheets. In continuous operation, maximum heating of material during grinding is no more than 33°C – and a maximum of 38°C when shredding glass fibre reinforced plastics. This removes the possibil- ity of thermal degradation. Granulators in the 600 series granulators offer
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the possibility of full scalability. Despite difficult material tasks, the regrind produced can be easily processed further. The latest granulator can be adapted according to predetermined conditions. The 600mm rotor works at a speed of around
400rpm, and has a working width of 1,500mm. A choice of rotors is offered, with three to seven continuous rotor cutting strips. The usual process of setting rotor blades has been eliminated. For film applications, the number of stator blades can be increased to four. There are special rotor versions for lumps and film applications, different wear protection packages for glass fibre reinforced material applications, and appropriate noise protection cabins.
Large throughput Neue Herbold exhibited its large SM1000/600 granulator at Fakuma – part of a recent extension to its SM series that completes its upper range with machines that have a rotor diameter of 1,000mm. The SM1000 series is designed for applications
where a large throughput capacity is required, or large and bulky materials are being granulated. The machines can be fitted with various types of feeding hoppers and devices as well as with various rotor geometries. Neue Herbold says this means that the SM1000 series machine can be used for a variety of
December 2018 | FILM & SHEET EXTRUSION 31
Main image: Hellweg’s 1500/600 granulator causes no thermal degradation of recycled material
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