Agitating – Having specified feed means – Liquid injector within mixing chamber
Patent
1998-01-28
2000-05-09
Walker, W. L.
Agitating
Having specified feed means
Liquid injector within mixing chamber
3661721, 366304, B01F 1502, B01F 504
Patent
active
060594446
ABSTRACT:
This invention provides a method and apparatus for mixing calcined gypsum. The invention comprises a mixer which employs high pressure water to eliminate or substantially reduce the formation of lumps of gypsum inside the mixer which cause paper breaks when the calcined gypsum slurry containing the lumps is used to form the gypsum core in a gypsum wallboard product. High pressure water jets direct a spray of high pressure water at the surfaces within the mixer where the lumps of gypsum are formed. The method of this invention utilizes the high pressure water as part of the metered water that is continuously fed to the mixer, with the balance of the water being fed through low pressure nozzles.
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Fullmer Lyle Dee
Johnson Steven Burdett
Whittington Charles Allen
Cecil Terry K.
Lorenzen John M.
Robinson Robert H.
United States Gypsum Company
Walker W. L.
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