MULTILAYER PACKAGING | MATERIALS


process. The new version had similar organoleptic properties as the original after 75 days, as well as similar microbial properties. “The new bag showed the same overall proper- ties as the PVDC bag,” they said.


Compatible mix While the main direction of travel is to switch to all-polyolefin structures, many multilayer films still use combinations of polymers that are hard to recycle. For this reason, there are also efforts to boost the recyclability of these structures. “The polymers used in multilayer films are immiscible,” said MiaoMiao Xiao, a research scientist at Ingenia Polymers. “Recycling without separation – or failure to compatibilise – leads to lower quality recyclate.” Compatibilisers overcome the effects of having a polar polymer – such as PA or PET – in a non-polar matrix such as a polyolefin. It reduces the particle size of the polar phase and increases its adhesion with the non-polar matrix, she said. An example is its Incircle IP1601, which “enables


the recyclability of PE/PA, PE/EVOH and PE/PA/ EVOH films”. Xiao said it outperforms traditional


maleic anhydride grafted PP-type compatibilisers – with better compatibilisation of PP/PA6/EVOH. “It enables recycling of PP barrier film scrap into other applications, in both flexible and rigid packaging,” she said. The recyclate was used in film processing. Without compatibiliser, the PP/PA6/EVOH could not be processed into good quality films – as they all contained holes and lacing – but with IP1601 the films had much higher quality. Another benefit included comparable tensile strength with neat PP. n Multilayer Flexible Packaging ran in Chicago, USA in May 2025. Forthcoming events covering similar topics include Stretch and Shrink Film North America (9-10 December 2025) and Polyethylene Films (2-4 February 2026). Both events run in Tampa, USA. For more details, contact Angelina Ruocco (angelina.ruocco@amiplastics.com) on +1 610 478 0800.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.amiplastics.com � www.reifenhauser.com � www.naturtec.com � www.ingeniapolymers.com


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