process feature | Recycling
The Clipp system uses two extruders and supercritical carbon dioxide to remove ink from printed fi lm
promoting better dispersion and compatibilisation of remnant particles into the polymeric matrix. A venting port situated at the end of the extruder allows degassing. Analysis of treated thermoplastic compounds using
the proposed recycling technology showed that synergetic combination of sc-CO2
, fi ltering and degas-
sing led to signifi cant VOC reduction (in some cases by a factor of nine).
Extrusion trials Extrusion blown-fi lm industrial trials were done in Skymark partner facilities in order to assess processabil- ity of PE-treated compounds. No bubble instabilities, die lines, melt fracture, gels or other issues were seen. Although fi lm obtained is not completely transparent, it is translucent enough to read a text through it. In addition fi lms show good aesthetics and mechanical properties similar to those from virgin resins.
As a main outcome the extruded PE fi lm does not emit any unpleasant odour and was suitable for
different added-value packaging applications, including fi lm for wrapping tissue packages, pallet top covers and mailing bags.
PCS was in charge of environmental, regulatory and
economical analysis. Operating costs for Clipp recycling technology are approximately €0.38/kg. This outcome, added to the fact that Clipp-treated compounds can be reused for added value products, strengthens its commercial viability. At the same time, a thorough health, toxicity and safety analysis found that – although current regulations insist that recycled materials containing pigments or adhesives must not be used for products intended to come in contact with food – Clipp materials can be used for food packaging applications in multilayer structures behind a functional barrier, because migration analysis agreed with Regulation EC 10/2011.
Also, Clipp-recycled material can be used in non
food contact applications where odour-free materials with low VOC emissions are needed.
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