Process for reducing the water vapour permeability of paper

Details Process for reducing the water vapour permeability of paper Process for reducing the water vapour permeability of paper

B - Operations, Transporting

32

B

B32B 29/06 (2006.01) D21H 19/18 (2006.01) D21H 19/46 (2006.01) D21H 19/56 (2006.01) D21H 21/16 (2006.01)

Patent

CA 2055745

The water vapor permeability of a sheet of paper is reduced by coating the paper sheet with a film of a water-based coating medium consisting of a wood-rosin sizing dispersion containing at least one additive improving the film-forming properties of the coating medium, the additive being selected from the group consisting of surfactants, paraffin waxes and ammonia, and subjecting the coated paper sheet to a thermal treatment at a temperature between 50 and 120°C.

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