Process for preparing calcined gypsum and gypsum board

Details Process for preparing calcined gypsum and gypsum board Process for preparing calcined gypsum and gypsum board

1978-09-05

1980-05-06

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Proteinaceous material containing

106110, 156 39, C04B 1100

Patent

active

042015952

ABSTRACT:
A process for preparing calcined gypsum (stucco) which comprises treating a mass of calcined gypsum by adding, with thorough blending, small portions of water (about 1-10% by weight) to the calcined gypsum, allowing it to heal, and grinding the healed stucco to recapture the rate of strength development and the ultimate strength which are adversely affected by the water addition. The principal advantage provided by the addition of small portions of water is a reduction in water demand which is retained despite the grinding and optional drying of the healed stucco. If the treated calcined gypsum is not used shortly after the healing procedure, it should be dried to provide storage stability. The reduced water demand is particularly useful in gypsum board manufacture.

REFERENCES:
patent: 3486965 (1969-12-01), Janninck
patent: 3616173 (1971-10-01), Green et al.
patent: 3947285 (1976-03-01), Jones et al.
patent: 3980487 (1976-09-01), Akabayashi et al.

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