Foamed gypsum wallboard

Details Foamed gypsum wallboard Foamed gypsum wallboard

1976-08-20

1977-11-08

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

156346, 366 3, 366 11, 264 50, 416237, B32B 520

Patent

active

040574431

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 liquids to be used in the manufacture of a continuous web of gypsum wallboard, subjecting this mixture to an intense agitation with vaned saw tooth-like rotary blades in a foam generator while adding a controlled quantity of air thereto, 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: 1660402 (1928-02-01), Thomson
patent: 2079565 (1937-05-01), Roos et al.
patent: 2243302 (1941-05-01), Weinig
patent: 2451445 (1948-10-01), Parsons
patent: 3290016 (1966-12-01), Lennon et al.
patent: 3376024 (1968-04-01), Beechler et al.
patent: 3459620 (1969-08-01), McCleary et al.
patent: 3638917 (1972-02-01), Osten

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