SIZE REDUCTION | TECHNOLOGY


hour, such as roll containers, plastic toys and pipes, into high-quality granulate. Devon Contract Waste selected a comprehen-


sive shredding system including automated conveyor technology supplied by Fercell, the UK dealer for Weima machines. In particular, the high level of efficiency and throughput capacity and the lower total investment costs over the lifetime of the plant were decisive factors. In addition, low energy consumption, reduced noise emissions and maximised flexibility of the plant during material changes were important in the decision. For the production of the high-quality plastic


granulate, Fercell designed a multi-stage system in cooperation with Weima and cutting mill specialist Neue Herbold. A Weima WLK 1500 single-shaft shredder handles pre-shredding and transfers the shredded plastic parts to the downstream cutting mill. Due to its homogeneous size, the pre-shred- ded material is ideally suited for the granulator used as a secondary shredder, which means that its blades need to be turned, sharpened and replaced less frequently. The Weima WLK 1500 single-shaft shredder


features high output capacities and shreds almost all types of plastics, such as hard plastics, fibres and foils. At the same time, its design makes it particu- larly tough against foreign materials. Individual parts, as well as whole bales, can be fed into the shredder‘s hopper by wheel loader or forklift truck, but also manually. With a working width of 1,500 mm, the WLK 1500 is able to process all materials without prior manual shredding by means of a band saw. This not only increases capacity, but also improves employee safety. The pre-crushed material is transported by a


discharge belt to the downstream Neue Herbold granulator. It passes a drum magnet and an overband metal separator. This protects the machine and guarantees long service life. The seamless integration of the control system and the


Stop-Go technology allows the filling of the granulator to be metered. The granulate is then removed by an extraction system, filled into big bags and sold as raw material for new products. Zerma has developed the ZIS 1500 single-shaft


shredder series with water injection, suitable for the pre-crushing of highly contaminated film bales, such as agricultural films. The company says that because shredders are much less susceptible to dirt, unlike granulators, it is also suitable for use as the first washing process of contaminated material. For material feed, the bales are placed in the large-scale hopper of the shredder by conveyor belts or forklifts. The bales are then separated and washed. During the shredding of the material and water injection, around 60-70% of impurities, such as sand and stones, are washed away. Another advantage is that the material discharge is more uniform and controlled within the water. A Zick-Zack screen is also used, which is particulary suitable for this application. The material is removed from the shredder by a transport screw and further pro- cessed in another washing plant. The machine has already been running successfully in South Africa. In order to meet current recyling needs, Vecoplan highlights the HiTorc direct drive that boosts shredding efficiency and requires significantly less maintenance. The company says that a controller integrated in the frequency converter ensures that the optimum torque is available at the rotor shaft at all times and in all operating conditions. As a result, the drive is extremely energy-efficient. The purely electrical solution requires no clutches, belt drives or flywheels, which means that maintenance costs are significantly reduced. The company adds that the HiTorc drive concept was developed when searching for a more efficient drive for shredding equipment. Shredders had to take on tougher jobs and the machines were becoming bigger. This also had an influence on the types of drives that could be used. They had to be


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