TECHNOLOGY | SIZE REDUCTION


clean secondary material for remanufacturing – a project for which he says Untha shredding technol- ogy is ideally suited. Brew adds that particularly when it comes to


dealing with “unshreddables“, the solution is problem solving by design. Different plastic types require different shredding technologies, complete with application-specific cutting configurations, power and output sizing capabilities, for example, as well as compatibility with downstream equip- ment. Shredding technology has adapted to meet this challenge. The latest plastics shredding technology from the company is the Untha CR, manufactured at its Austrian headquarters. It utilises the Untha XR chassis, which builds on market success to date, particularly when handling tricky materials without compromising on uptime, low wear costs, flexibility and energy efficiency. However, this latest model has been engineered so that it is ideal for plastics recycling. The Untha CR is a high-performance single shaft plastics shredder, specifically engineered for shredding complex and tougher plastics applica- tions, at high volumes but without the high speeds. It has been designed with robustness and flexibility in mind, to protect the operator’s investment. It is therefore highly configurable, so can pre-shred difficult plastics, process post-consumer plastics bales among many other applications, such as mixed rigid plastics and agricultural film. The company adds that the Untha CR comple-


ments, rather than replaces, the Untha LRK – an- other single shaft shredder which has been installed on thousands of sites worldwide, with some still operating more than 20 years later. Known for its operational simplicity and easy maintenance, the LRK is a compact, high through- put machine with quick-change cutters for maxi- mum uptime, particle precision and all-round cost-effective shredding. The key design features for productivity and


profitability of the Untha CR include a sturdy drive system with high torque motors – 75, 90, 110 or 132 kW – including safety clutch, and internal pusher system for high throughputs. Direct


Right: Knives and knife holders of the Lindner Mono-Fix system can be freely positioned on the rotor and changed with just one screw


36 PLASTICS RECYCLING WORLD | May/June 2021


Above: The Untha CR is a high-performance single shaft plastics shredder, specifically engineered for shredding complex and tougher plastics applications, at high volumes but without the high speeds


drive eliminates the need for a belt and reduces wear and maintenance. Versatile cutters include indexable inserts that may be rotated up to four times, as well as particle precision where 25-80 mm is achievable depending on output specification. It also has high availability, which is five to seven times higher with tooling steel and carbide plates. Perforated screens are also available. The company adds that the Untha CR has a


sturdy torsion-resistant steel frame to withstand the pressure of heavy loads, with in-built foreign object protection, and multiple hopper options to suit different feed methods. There is a touch screen control panel for easy, ergonomic maintenance and ongoing shredder optimisation, and a 2,000 mm rotor, with variable speeds of 0-103 rpm. It can easily shred down to a 40 mm product, and Untha has also been working with partners to achieve a much smaller output for Waste to Energy projects. Lindner has developed a flexible cutting system


to extend the scope of shredders for plastics recycling. Plastics for recycling have a wide range of mechanical properties, such as elongation at break, impact toughness or Shore hardness. These all require different approaches to shredding and recycling. The company adds that due to these different mechanical properties, shredder cutting systems are often specifically designed to shred a particular material. For example, the cutting geometry of pointed knives has a positive effect when shredding extremely tough materials such as big bags, ropes or nets that have to withstand high tensile loads. In this


www.plasticsrecyclingworld.com


IMAGE: UNTHA


IMAGE: LINDNER


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