SHREDDERS | TECHNOLOGY


sharpened a number of times by regrinding. The rotor is produced from a single solid piece of steel and weighs approximately 4,000 kg. The overall weight of the machine amounts to around 11,000 kg. Depending on the material to be granulated, achievable throughput ranges amount to between 800 and 3,000 kg/h, allowing for 5-20 mm diam- eter sieve perforation and 75-90 kW installed power rating. Complete noise protection cabins as well as feeding equipment for sheets and pipes are available as options. Hellweg has recently supplied a MDSG 1000/600 BR shredder to B. Braun Melsungen, a producer of medical and pharmaceutical products. The company produces 245 million LDPE bottles per year on extrusion blow moulding process lines in 250, 500 and 1,000 ml sizes. Hellweg adds that enormous forces, or in extreme cases, machine damage can occur should two LDPE lumps become wedge-shaped in a shredder’s grinding chamber, or the slip-stick effect arises, which can lead to machine downtime. Requiring high productivity and efficiency, B. Braun Melsungen opted for a large lump shredding mill to shred LDPE start-up lumps. The shredded material obtained is processed further into granulate in a twin-screw extruder and fed back into the produc- tion line. B. Braun Melsungen selected the Hellweg


shredder to increase its capacity and offered an automated solution to relieve its staff of certain duties. According to Hellweg Managing Director Mark Hellweg, the company tailor- made the lump shredder mill for B. Braun exactly to its requirements, with special shredding technology required for such tough LDPE lumps. The lifting/tipping equipment for containers, weighing up to 500 kg, makes a significant contribution towards assisting the staff. They automatically feed lumps to the shredder’s steel hinge conveyor belt. The operation of the shredder is unaffected whether it is fed with a single lump or an entire container gets into the shredding chamber in one go. Mark Hellweg adds that the


large, robust and high perfor- mance design ensures there is no overload and resulting machine standstill, even when a slip-stick effect arises between two lumps - when static friction


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exceeds dynamic friction and the lumps “stick together”. Despite the size of the shredder, the company says that it has low energy consumption. Enma Granulator, which has bases in China and


France, has launched a two-in-one combined shredder and granulator. The TIO 1300 was one of the units promoted by Enma at its NPE 2018 booth in Orlando in May. The model combines Enma’s EMS series single shaft shredder and GE series granulator in one unit. It is intended for use in size reduction of lumps, film, solid materials and bulk materials, which cannot be handled by regular granulators. The TIO 1300 has a compact design, but is built


with a robust structure. A 30% inclined feed reduces pusher pressure and a V-shaped rotor design reduces energy consumption. It also has a feeder chamber that can be opened for quick changing of the blades. Other benefits are low noise and low investment, says Enma. Weima has introduced the WKS, which is claimed to be ideal for processing everything from bulky objects to tear-resistant fibres and film. A swing ram on rolls is posi- tioned inside the cutting chamber, providing for consistent infeed of materials. An inspection flap inside the chamber allows for easy access for preventative maintenance and to clear any foreign objects that may have been introduced during the


shredding process. These shredders come equipped with hydraulic drives or power belt drives depending on the application. The rotor type depends on the application –


May/June 2018 | PLASTICS RECYCLING WORLD 41


Above: Plastics recycler Indigo Environmental in the UK has invested in a new Untha RS40 shredder to boost its processing capabilities


Left: The MDSG 1000/600 BR lump granula- tor from Hellweg


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