Two commercial papers used in industrial applications for pet food packaging were studied.In particular,the grease proof efficiency was determined by standard and home-made industrial methods.The differences in grease barrier behaviour could be explained by the fluorine atom distribution in the thickness of the samples.The results showed that the concentration and distribution homogeneity of fluorine atoms could lead to different grease proof efficiencies,but also to different physico-chemical properties of the paper surface,which were detrimental to printability.
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