Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1995-12-22
1997-11-04
Czaja, Donald E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
264 43, 2641711, 26417219, 156 39, 156346, B29C 6500
Patent
active
056836350
ABSTRACT:
The invention provides an improved method for preparing foamed gypsum products. The invention can utilize a single mixing chamber and significantly improve the efficiency of foaming agent usage. In the method of the invention the point of insertion of aqueous foam into calcined gypsum slurry is positioned such that the foam is agitated less than the calcined gypsum to thereby minimize destruction of the foam while still uniformly dispersing the foam in the calcined gypsum slurry. This is accomplished, for example, by locating an inlet for foam closer to the discharge outlet of a slurry mixing chamber than the location of the inlet for calcined gypsum or by locating the foam inlet in a discharge conduit connected to the discharge outlet of the slurry mixing chamber.
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Pending U.S. Patent Application Aug. 08/311,687, filed Sep. 23, 1994, "Producing Foamed Gypsum Board", S. W. Sucech.
Buster Kip R.
Hinshaw Stewart E.
Nemeth Bradley S.
Sucech Steven W.
Colaianni Michael P.
Czaja Donald E.
Janci David F.
Lorenzen John M.
United States Gypsum Company
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