Vigilancia Tecnológica

The present invention relates to a method for producing a barrier substrate comprising a microfibrillated cellulose (MFC) film and a polymer film. The method comprises providing a suspension comprising 50-100 weight- % MFC based on total dry weight and having a dry content of 1-40 weight-%. A wet MFC film is formed of the suspension by casting on a non-porous support and the wet MFC film positioned on the support is dewatered and/or dried to a dry MFC film having a moisture content of 20 weight-% or less. A polymer film is applied on the dry MFC film positioned on the support to form an intermediate substrate, which is pressed in at least one nip to form the barrier substrate. The invention relates also to a barrier substrate obtained by the method, a laminate comprising the barrier substrate and a paper or paperboard substrate, and a packaging material comprising the barrier substrate or the laminate.