Method for the production of heat-sealing barrier paper
AssigneeMunksjö Oyj
InventorsLaurent Schildknecht, Séverine Schott, Pascale Escaffre
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Abstract
The invention relates to a method for the production of a heat-sealable paper that forms a barrier to water vapour, in particular having a water vapour permeability of at most 150 g/m2/24 h measured according to ASTM F1249 under so-called tropical conditions of 38° C. and 90% relative humidity, in which at least one coating layer comprising at least one thermoplastic film-forming polymer is applied in-line on the paper-making machine to the fibrous substrate.
Claims34
A process for manufacturing a heat-sealable water vapor barrier paper having a water vapor permeability of at most 150 g/m2/24 h measured according to the ASTM F1249 standard under conditions of 38° C. and 90% relative humidity, in which at least one covering layer comprising at least one thermoplastic film-forming polymer is applied in-line on a papermaking machine and to a precoat layer, and in which the precoat layer is applied to a fibrous substrate in-line before the application of the covering layer to the precoat layer.
Dependencies are inferred from the claim text.