New routes to migration modelling for adhesives
Project co-ordinator at Fraunhofer IVV, Germany, Angela Stoermer explains that adhesive formulations can contain up to 15 different components. But while mathemati- cal modelling is accepted in assessing migration from many plastics, the same is not yet true for adhesives.
Stoermer says: "Our work should allow the entire packaging chain to be confident that modelling is an equally appropriate and useful tool for adhesives, and not only in plastic laminates, but also in applications with paper and board."
Parameters such as diffusion coefficients within layers and partitioning coefficients between them have been determined, she says, for the most common adhesive types and materials in food applications.
"The industry partners on the project put it more succinctly: migration calculation rather than measurement," Stoermer says.
The work was highly challenging, she explains, given the complexity of adhesives and the range of substrates being assessed, and a large amount of experimentation was required. While the project has resulted in a starting set of migration-modelling parameters, this data needs to be extended in future, she adds.
The conference, 27-28 April in Ljubljana, Slovenia, is organised by FEICA, the European Association of Adhesive and Sealant Manufacturers.
As well as Stoermer, speakers include Roland Franz, also of Fraunhofer IVV, and Cristina Nerin of the University of Zaragoza.
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