Barrier film | materials
The specialised, high tech nature of barrier film means it accounts for a small volume – but a high share of the value – of food packaging. Lou Reade reports
Protected status: advances in barrier film
Food wastage is becoming a key topic, and one that plastic packaging – especially barrier packaging – can help to solve. As a result, a number of research projects are actively targeting an improvement in barrier film. Aimplas of Spain says that the pan-European Banus
research project – which it coordinated – made “significant progress” towards the understanding of functional barriers that allow the use of non-authorised recycled materials in food packaging. “The knowledge achieved opens the door to new
working lines to develop new and completely safe products,” said Aimplas. The project aimed to evaluate the functional barrier
performance of different structures, including the optimisation of methodologies of contaminating materials and evaluating the migration of the substanc- es used as contaminants. “A considerable advance has also been made regarding characterisation of coatings, and the
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behaviour of the contaminant substances inside the different structures,” said Aimplas. Regarding production of packages containing non-authorised recycled materials, none of the structures evaluated in Banus were completely effective – but the results helped participants to identify the critical points in current structures. The researchers managed to detect diffusion of the
contaminant substances during the co-extrusion, which limits the effectiveness of barrier when using this production technique. Project partners include Innventia of Sweden, Bobino
Plastique of France, MTM Plastics of Germany and AVEP of Spain.
In addition, Aimplas is also co-ordinating the Dafia
project, which will recover the organic fraction of municipal solid waste – and from the marine industry – to make new products, including barrier film for multi-layer packaging.
May 2017 | FILM & SHEET EXTRUSION 43
Main image: The Banus project
investigated how ‘non- authorised’ materials behaved in barrier
structures
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