INNOVATION | WASHING
Sorema adds that it was selected for this project in 2019 due to its specifically designed flexible washing line. This was able to guarantee compli- ance with the parameters required for the produc- tion of high-quality material coming from stretch and post-industrial films, as well as to ensure production from agricultural and post-consumer films, raffia and jumbo-bags. The film-to-film recycling line incorporates the most advanced technical solutions of Sorema’s modular plant system. These include a low speed and high torque hydraulic shredder, specifically designed by Sorema’s holding company Previero, as well as a flexible pre-washing system with a high friction module and pre-washing centrifuge to process a wide range of contaminated materials. At the end of the line, there is fluff storage to feed an extruder with dehumidified material. With the Sorema line, productivity at PPHU ANNA
has reached an output of up to 1,000 kg/h of decon- taminated and granulated material at a competitive quality/price ratio. The material obtained is then suitable for extrusion on blown films lines located both in Poland and abroad. Among these proces- sors is Bogucki Folie, which produces B-ECO, an innovative PE film with a three-layer structure and based on 100% recycled material from post-con- sumer and post-industrial waste. Holding company Previero has also formed a new wastewater treatment company, Teknodep- urazioni Aquae. In October 2020, the company finalised the acquisition of the business branch of Teknodepurazioni srl, based in Rivarolo Canavese, near Turin in Italy. This allows Sorema to offer complete solutions for plastics recycling, provid- ing customers with a turnkey system with integrated, efficient and reliable wastewater treatment. Krones is also introducing
wastewater treatment in plastics recycling systems. The company says that recycling technology’s sustainability must not be assessed by the quality of its end-product alone. The processes used to make this product play an equally important role. The company’s MetaPure technology recov- ers materials from PET bottles and polyolefin packaging, for example, in a quality that enables the recyclate obtained to be used in equivalent applica- tions. Through continuous system optimisation, Krones has examined the washing module’s water consumption. “In the recycling process, the plastics are ground
16 PLASTICS RECYCLING WORLD | July/August 2021
into flakes in wet mills and then washed,” says Astrid Kadlubski, Product Manager. “This produces wastewater containing various dissolved substanc- es, depending on the input material concerned.” In addition to common soiling, these include organic residues of the packaging’s contents, for example, or cleaning agents from the washing process and printing ink particles removed from bottles and labels.
“In many recycling lines, the water is recirculated
and treated in a by-pass,” adds Kadlubski. “With the result that the process water’s dirt load keeps on rising and ultimately impairs the end-product’s quality.” To counter this, Krones has, in conjunction with an associate, developed an intelligent solution for complete treatment of the washing and mill water. This provides several advantages for the recycling line operation. “Firstly, this reduces both freshwater consumption and wastewater inci- dence,” says Kadlubski. “Secondly, the recycling process is kept at a consistently high level of quality. And last but not least, such treatment makes sure that the wastewater discharged into the municipal system complies with the relevant specifications. Needless to say, this also applies for the ultra-stringent regulations in Germany.” Herbold Meckesheim has supplied a washing line for a UK film recycling company processing around 10,000 tonnes per annum. It is designed for 100% post-industrial stretch film. Herbold says that this is a demanding application for wash lines, because of the high surface area and low bulk density involved. The washing line includes a Herbold EWS 45/200 shredder, which is used as a pre-shredder prior to the wet granulator. The new
Above: Krones’ MetaPure technology recovers materials like PET bottles and polyolefin packages – in a quality enabling the recyclate obtained to be used in equivalent applications
www.plasticsrecyclingworld.com
IMAGE: KRONES
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