Coperion GmbH is implementing a closed-loop concept for the production of flexible multi-layer film. According to the Stuttgart, Germany-based specialist in plastics and other recycling equipment and systems, recycling multi-layer film has long posed a challenge since such films can only be reclaimed in very complicated ways and not without residues.
Most recently, Coperion has developed a closed-loop approach solution in which up to 100 percent of multi-layer film production waste can be re-processed and fed back into the production process in a closed-loop.
On a current project Coperion will deliver a recycling system, including bulk material handling, high-accuracy feeding from Coperion K-Tron, and the heart of the system, a ZSK Mc twin screw extruder.
Closed Loop Using the Most Advanced Technologies
Multi-layer film waste resulting during the production process is shredded as a first step before it is fed into the ZSK extruder via pneumatic conveying and highly accurate feeding from Coperion K-Tron. There, the material is homogenized and devolatilized with very high intensity in the co-rotating ZSK MC18 twin screw extruder. Within the extruder, dispersion and devolatilization performance are crucial to end product quality — with gentle product handling and very good mixing behavior even at very high throughput rates, thus achieving consistently high product quality.
Following homogenization in the ZSK extruder, in the closed-loop concept, the recycled material is added back into the multi-layer film production process; with no quality loss and the proportion of added recyclate is very high. Multi-layer film manufacturing thus takes place sustainably, highly efficiently, and resource-friendly with the aid of advanced technologies.
Peter von Hoffmann, General Manager of Business Unit Engineering Plastics & Special Applications at Coperion, is convinced: "Sustainability is becoming more and more important, and the topic of the circular economy is moving further into the foreground for companies - and that is much more so for multi-layer film producers. We're proud that, with our years of process know-how and our visionary technological solutions, we can contribute to a promising, forward-looking and sustainable closed-loop approach."
