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SORTING | TECHNOLOGY


As the recycling industry matures and evolves,


recyclers are becoming more demanding about the quality of the end product they produce, concludes Alex Vaks. “We will be addressing more issues - not only with single optical sorters – but with complete systems where more of the materials can be recovered and less materials end up in landfill. For example, where recyclers currently produce only two streams of materials at the end of their recy- cling lines – Natural/Clear and Jazz (as Jazz contains many unwanted impurities therefore regarded to be of very little value) — we will provide technology that can separate Jazz into individual groups of colours and material streams, thus maximising use of materials and diverting away from landfill. In the future we are looking forward to working on projects where value is optimised to the absolute maximum and all material is recycled and reused. To achieve this we will offer even further enhancements in polymer, colour and other separations, to the point of near perfection.” Other sorting technology companies are also making advances. Sesotec has modified the Flake Purifier+ plastics multi-sensor sorting system. In addition to optimised material in-feeding, the company says that it is now equipped with a 3.2mm nozzle and valve grid, which ensures higher precision in contaminant separation and a reduced loss of good material. Furthermore, the dust-proof design and the re-sort track that can be integrated in the Flake Purifier+ also increase efficiency in the recycling process, especially in cases with highly contaminated input material. The company has recently provided sorting technology for Rejeki Adigraha, an Indonesian company specialising in the recycling of PET and PVC materials. Headquartered in the Jababeka Industrial Area, Rejeki Adigraha has around 150 employees and has a recycling capacity of approxi- mately 1,000 tonnes of PET and PVC per month. The company has replaced the manual sorting of PET and PVC flakes with the automated Sesotec Flake Purifier multi-sorting system. The recycling process starts with plastic materials from residual waste and plastic flakes containing 70% PVC and 30% other plastics, mainly PET. The material is first shredded to obtain parts of approximately the


www.plasticsrecyclingworld.com


same size, and then passes through washing and drying processes. The Flake Purifier then separates the PVC. The specially adapted small conveyor ensures that the plastic flakes are optimally singularised. In addition to the sensors for metal and colour separation, Sesotec also provides a high-performance module for the detection of con- tamination, which also include different types of plastics. Depending on the application these sensors are used individually or in combination. Redwave has developed the 2i sensor-based


sorting device, equipped with the new interactive intelligence that can not only be used directly on the sorting machine, but also anywhere and anytime on mobile devices and computers in real-time. The company says this development of ad- vanced human-machine- computer communication and access to real-time ana- lytics and statistics provides the ability to monitor, control and optimise sorting processes at any time. In addition, Redwave 2i uses Sensor Fusion for optimised sorting quality, with additional benefits in


terms of quick and simple system


implementation, additional features for convenient machine maintenance and user- friendly operation. Up to six different fractions can be sorted with just one machine, it says. The company has supplied equipment for the


largest plastics sorting plant in Austria. At the end of last year, Saubermacher Dienstleistungs placed an order with Redwave for the planning and construction of the expansion and renewal of a plastic packaging sorting plant in Graz Puntigam. Around €2m was invested in the plant expansion; over the last few years, a total of over €10m has been invested in Graz by Saubermacher. Saubermacher sorts the material on behalf of


Altstoff Recycling Austria (ARA). Most of the packaging waste comes from households and businesses and is mixed. Miss-sorted material accounts for around 23%. In this plant, the Red- wave sorting machines, which rely on sensor-based sorting using near-infrared and colour detection technology, separate the plastic packaging by grade. This is essential for its use in the manufac- ture of new products.


Changes in the contents of the yellow recycling collection bags made the investment in the sorting system necessary. A new bag ripper to open the


September/October 2018 | PLASTICS RECYCLING WORLD 37


Left: The Flake Purifier+ from Sesotec


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