Foamed gypsum wallboard

Details Foamed gypsum wallboard Foamed gypsum wallboard

1983-02-01

1984-06-19

Parrish, John

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 50, 264333, B32B 520

Patent

active

044552718

ABSTRACT:
Lightweight gypsum wallboard produced by continuously combining a small amount of surface active agent with a liquid stream, which stream is made up of substantially all of the water to be used in the manufacture of a continuous web of gypsum wallboard, passing this mixture through a long cylindrical static mixing tube filled with one inch ceramic saddles, while adding a controlled quantity of air thereto, then passing the mixture through a shorter cylindrical static mixing tube of equal diameter filled with 3/8 inch ceramic Raschig rings, forming a uniformly dispersed foam of very small bubbles from the liquid by completely generating all of the surface active agent therein to form this foam, and mixing this foamed liquid with finely ground dry calcined gypsum in a suitable mixing device to form a foamed settable gypsum slurry, disposing the slurry between paper cover sheets, and forming a continuous web of gypsum wallboard.

REFERENCES:
patent: 2079565 (1937-05-01), Roos et al.
patent: 2639901 (1953-05-01), Teale
patent: 2864714 (1958-12-01), Dixon et al.
patent: 3974024 (1976-08-01), Yano et al.
patent: 4057443 (1977-11-01), Stiling
patent: 4057608 (1977-11-01), Hashimoto

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