Gypsum board coating

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B - Operations, Transporting

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B05D 1/30 (2006.01) B05D 1/36 (2006.01) B05D 5/00 (2006.01) B05D 7/24 (2006.01) C04B 41/45 (2006.01) C04B 41/47 (2006.01) C04B 41/61 (2006.01) C04B 41/62 (2006.01) E04C 2/04 (2006.01)

Patent

CA 2070489

27964-2 ABSTRACT A gypsum board having an integrated moisture vapour barrier layer of an improved moisture vapour impermeability is disclosed. The layer is applied to the surface of the board by curtain coating a hot melt of a material comprising a natural or synthetic wax, such as a paraffin or polyethylene wax and, for example, an ethylene-vinyl acetate copolymer or a microcrystalline wax, and permitting the melt to cool. To improve the integrity of the moisture vapour barrier layer by reducing the formation of pinholes and blisters during the curtain coating, a layer of a paraffin or microcrystalline wax may be applied to the surface of the board, for example by brushing or spraying, prior to curtain coating.

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