TECHNOLOGY | EXTRUSION LINES


Above: The Binova line with EBB71 co-rotating twin-screw extruder in a photo taken by drone at the company’s development centre


highly printed materials or materials with up to 15% moisture content. Binova says its modus operandi is to develop


recycling plants that completely fulfill the needs of the customer. In most cases, they are developed in cooperation with the customer, such as a line it developed earlier this year. The line incorporates an EBB71 co-rotating twin-screw extruder with 71mm screws, equipped with automatic filtration, volumet- ric pump and forced feeding unit which is used for material with low apparent density (0.06 kg/dm³). The line is for recycling and compounding HDPE scraps with MFI ranging 0.3 g/10 min up to 1.3 g/10 min, at a production rate of about 500 kg/h. The plant is designed to compound light


Right: The Binova line is equipped with software that controls the whole produc- tion process and an automatic OP control panel with internet connection, which can also be managed remotely


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production scrap material, such as in-house film scrap, or material from a washing plant with a residual moisture level up to 8%. These washed materials could be mixtures of pellets and granu- lated or densified waste, containing mineral fillers such as CaCO3 or talc up to 40%. Binova said: “The mixing of different raw materials, performed directly in the machine, ensures a perfect homog- enisation, able to increase the quality of the final product. The dosing system of the various compo- nents can be either gravimetric or volumetric.” The company sees the technology as having advantages for recyclers. It makes a high quality final product with an MFI unchanged from the material introduced at the beginning of the process. Binova also claims transformation costs are reduced, due to energy savings of up to 40% versus the current market standard — for the whole plant, energy use ranges from 0.29 kW/kg to 0.33 kW/kg in respect of maintaining the MFI of the material fed in at the beginning of the cycle. The co-rotating twin-screw extruders of the EBB


BiReC series are equipped with modular barrels and modular extrusion screws, with self-cleaning sectors, mounted on grooved shafts. The barrels, with different L/D ratios, are thermostated by water and


PLASTICS RECYCLING WORLD | September/October 2018 www.plasticsrecyclingworld.com


by pressurised air in highly insulated conveyors that enables the maximum energy saving in warming up, said Binova. It uses special chromium steel, and in some cases anti-wear or corrosion-proof bimetallic materials can be used. In addition, it is possible to employ special interchangeable bushes, made of hardened steel with a highly resistant core. The four barrel modules are: standard; power; degassing/ venting module, in which the barrel is equipped with exhaust flues that can operate both in the presence of vacuum and of atmospheric pressure; and lateral supply module, where the barrel is arranged for the lateral or vertical introduction of powder additives, resins or liquids. KraussMaffei Berstorff is offering its expertise in compounding systems to plastics recyclers in its Edelweiss technology. Edelweiss combines a single-screw, counter-current recycling extruder from Erema inline with a KraussMaffei Berstorff twin screw extruder in a “recompounding” process that converts basic recyclate into a value-added compound. Ralf Dahl, Vice President Twin Screw Extruders at KraussMaffei Berstorff, said there is currently “huge momentum” in plastics recycling, driven not just by environmental concerns but also by industry commitments from major polymer producers and large waste management groups extending their businesses into recycling. An important development has been the greater involvement of large brand owners like P&G and Unilever in recycling and the use of recyclate in their packaging. “These people are talking about real volumes now, major raw material streams are to be handled,” said Dahl. “Here, conventional plastic recycling systems are limited in quality and quantity. Upcycling/recompounding systems are asked for, with capacities larger than 2-3 t/h, aiming at plants with capacities of 50,000-100,000 tpa.” KraussMaffei Berstorff, he said, is a “natural


partner” for the growing industry need for more advanced recycling systems, as it provides suitable extrusion technology, engineering capacities,


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