Method and tool for embossing of barrier paper

Abstract

A method for embossing a barrier paper, wherein the barrier paper comprises paper and a protective layer on at least one of its sides. The method comprises providing a first embossing system with a first embossing tool and a second embossing tool cooperating with the first embossing tool to emboss the barrier paper: providing a patrix structure on the first embossing tool: providing a matrix structure on the second embossing tool: whereby the matrix structure corresponds to the patrix structure in such a manner that when embossing the barrier paper, a functionality of the protective layer is preserved. The method further comprises embossing the barrier paper by inserting the barrier paper between the first and the second embossing tools, applying pressure between the patrix and the matrix structures to press the patrix structure on a paper side which is a side of the barrier paper opposite to the side with the protective layer of the barrier paper, and push the barrier paper in the matrix structure, whereby the protective layer faces the matrix structure, thereby modifying a fiber structure of the paper in the barrier paper by at least one of the following effects: breaking of paper fibers, compressing of the paper fibers, densifying of the paper fibers; resulting in a modified folding behavior of the barrier paper and in maintaining a substantially unchanged shape of the barrier paper over its lifetime.