Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
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
Hause Robert F.
National Gypsum Company
Parrish John
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