APK Relies on Coperion ZSK Extruder Technology

For its solvent-based plastic recycling process Newcycling, APK AG is relying on the ZSK extruder technology and technical process expertise from Coperion. Using the Newcycling process, multi-polymer and multi-layer plastic packaging, that previously could not be recycled, can now be separated and processed into homogeneous regrind using ZSK twin screw extruders.
Photo: APK

In contrast to chemical recycling, the polymer in this process remains unchanged and does not require energy- and cost-intensive re-polymerization. Newcycling, therefore, is highly efficient from a cost and from an environmental perspective.

Thanks to the solvent-based Newcycling treatment, as well as the devolatilization performance and gentle material handling in the ZSK extruder, the quality of the recyclates is close to that of virgin product.

This one-of-a-kind physical and solvent-based process enables clean and single-origin polyamide (PA) and polyethylene (PE) pellets with virgin-near material character to be extracted from complex PA/PE multi-layer films. These recyclates can be reused in high-quality products up to the original application. Downcycling can thus be reduced and closed-loop recycling becomes possible.

In Newcycling at APK’s Merseburg location, PA/PE multi-layer film is first mechanically pre-treated, undergoing among other things shredding and classification. Next, the PE layer is dissolved and liquefied in a solvent bath, leading to separation of the polymers and polymer layers. The undissolved PA is then separated from the dissolved PE using conventional solid-liquid separation technology and the polymers are further processed in separate material streams.

The PA is introduced into a Coperion ZSK twin screw extruder where it passes through various process sections and is processed into a high-quality PA melt using very high dispersion performance and intensive devolatilization. Finally, it is pelletized into first-class PA recyclates.

Following pre-evaporation, the PE is likewise introduced into a ZSK twin screw extruder together with the solvent. There, intensive devolatilization of the liquid takes place, precisely calibrated for this application to produce first-class results even when PE/solvent ratios fluctuate. The solvent is completely volatilized and added back into the Newcycling® process in a closed loop. PE remains in the form of a homogeneous, high-quality melt that is then pelletized. The PE recyclate possesses quality similar to that of virgin product.

PE recyclate manufactured using APK’s Newcycling technology and marketed under the brand name Mersalen, as well as PA recyclate sold under the brand name Mersamid, stand out for their high product quality and substantial reductions in emissions. Newcycling® recyclates exhibit on average 66% fewer emissions than virgin material of a given plastic. In pointing out the market potential for Newcycling recyclates, Klaus Wohnig, CEO of APK explains: “Our recyclates’ very high degree of purity has been confirmed by numerous expert reports. Mersalen for example is suited for a wide range of applications such as cosmetics packaging.” Jochen Burger, Process Engineer at Coperion, elaborated: “In APK’s innovative Newcycling process, we see a very important step along the path to a circular economy in the plastics industry. Thanks to the use of first-class technologies and comprehensive process expertise from APK and Coperion, very high-quality recyclates are being manufactured. At the same time, the process saves energy and resources because it replaces cost-intensive new plastic production. In this way, we are serving the environment and future generations. Coperion is proud to support APK in this innovative process.”


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