RECYCLING & GRANULATORS | MACHINERY
The latest granulation and recycling developments include a new high torque model that minimises thermal degradation, and a new catalyst that can break down polymer chains
Cutting edge: developments in granulators and recycling
Recovery of plastic materials recovery has become increasingly important – whether in terms of returning offcuts straight back onto the production line or for producing large amounts of recyclate for use in operations such as PVC window extrusion. In each case, efficient re-granulation is the key.
And, as well as this, there are an increasing number of techniques to recover used plastics and make them suitable for re-use. Hellweg Maschinenbau recently 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
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including thick-walled mouldings, sheets, pipes and profiles. 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 possibility of thermal degradation. Granulators in the 600 series granulators offer 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. Depending on the material to be granulated – and the size of the screen block used – throughput reaches 800-2,500kg/h. Drives with nominal installed power ratings between 75 and 110kW help to ensure this. The high performance is accompanied by high energy efficiency and gentle material treatment, says Hellweg. Peak loads are mechanically compensated very effectively – thanks to the high rotor weight, and the arrangement of the blades according to a high-shear cutting principle. 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.
Main image: Hellweg’s 1500/600 granulator causes no thermal degradation of recycled material
� April 2018 | PIPE & PROFILE EXTRUSION 23
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