Starch-coated paper and gypsum wallboard prepared therewith

Details Starch-coated paper and gypsum wallboard prepared therewith Starch-coated paper and gypsum wallboard prepared therewith

B - Operations, Transporting

32

B

117/61, 154/69

B32B 13/08 (2006.01) E04C 2/04 (2006.01)

Patent

CA 1087080

ABSTRACT OF THE DISCLOSURE A composition comprising water, finely particulate gypsum and starch is coated on a paper cover sheet in a selective pattern such that the starch composition is disposed only at limited areas of the bond liner surface, and wherein substantial areas of the bond liner surface are free of the coating; the coated paper, either in the wet stage or after drying being used as paper cover sheets to form gypsum wallboard by applying an aqueous slurry of calcined gypsum, which may be free of starch, to the coated surface and setting the gypsum, resulting in a gypsum wallboard having excellent adhesion between the paper cover sheets and the gypsum core.

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