Scientists studying the migration of ink components to food contact materials (FCMs) have found 24 chemicals that transfer from the outer surface of multilayer packaging materials to food during storage.

The researchers, from the University of Zaragoza in Spain, studied ink migration from several multilayer materials to two food simulants. Seventeen out of the 24 migrants found came from a material made up of ink, polyethylene terephthalate (PET), aluminium and polyethylene.

The migration is due to a set-off phenomenon during the materials storage, the researchers conclude, allowing the transfer of ink components from the outer printed surface of FCMs onto the inner, non-printed food-contact surface. Applying external lacquers was found to reduce the migration significantly. However, the scientists note that “the composition of these lacquers should be carefully selected”, as it does not behave as a total barrier and can contribute to an additional migration of new components.

The study was published in the journal Dyes and Pigments.

Source： Chemical watch

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