WASHING SYSTEMS | TECHNOLOGY
new installation based on Herbold Meckesheim’s layout consisting of an EWS 60/210-S shredder, a VWE 700 pre-washing unit, a SMS 80/160-F7-2 granulator with the option of expanding to two, a FA 60/300 friction washer, a TBW 15 turbo washer with hydrocyclone and friction separator, a mechanical dryer T 2015 S PA, two thermal dryers and a final granulator SML 60/145 SX5-2. Also at K2022, Sorema exhibited a reaction tank
model STR 18/25. STR stirring units are installed in hot washing modules because they improve chemical washing performance and guarantee the best separation of contaminants such as glue and organics while minimising energy, chemical and water consumption. Like previous models, the STR 18/25 model
presented at the exhibition is constructed entirely of stainless steel, insulated, and equipped with PLC-controlled sensors for process management. This latest version has been improved by develop- ing the design of the impellers and internal geometry, allowing the development of lines up to 10,000 kg/h in output. The high decontamination quality of the STR 18/25 makes it especially suitable to produce flakes used in high quality and upcycling processes such as bottle-to-bottle, sheet and high-quality fibres. The Italian company has already installed a new
PET bottle recycling plant at recycler OK Plast in Democratic Republic of Congo featuring a pelletis- ing line for bottle-grade rPET pellets provided by Starlinger. The plant has output of 1,200 kg/h of washed rPET flakes from bottles, which OK Plast collects through collection points installed in the city of Kinshasa. The bottle-to-bottle rPET washing
line includes several stages: automatic feeding, prewashing, and de-labelling, followed by wet grinding, hot washing, flotation, and finally rinsing and drying stages. Sorema recently upgraded the bottle prewash system so it not only washes bottles after dry pre-sorting, but also removes labels and all external contamination, which may include sand and grit in addition to organic material. The next step involves grinding the bottles into flakes using water grinders. Then, hot washing with friction ensures modules, synthetic glues and all residual organic contaminants are removed. After drying and sorting by colour, the treated flakes are transported to a Starlinger RecoStar PET iV+ plant to produce high quality rPET pellets suitable for direct food contact applications. The plant repre- sents a significant step in the continued expansion of recycling in Africa, helping to solve the plastic waste problem and providing job opportunities for local communities. Sorema has already built
Above: The multi-stage washing technology developed by Sorema
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IMAGE: SOREMA
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