Method for preparing foamed gypsum product

Details Method for preparing foamed gypsum product Method for preparing foamed gypsum product

B - Operations, Transporting

32

B

B32B 5/20 (2006.01) B28B 19/00 (2006.01) B28C 5/12 (2006.01) C04B 28/14 (2006.01)

Patent

CA 2213499

The invention provides an improved method and apparatus for preparing foamed gypsum products. The invention utilizes a single mixing chamber. In the method and apparatus 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.

Procédé et appareil améliorés permettant de préparer des produits en plâtre expansé. La présente invention fait appel à une seule chambre de mélange (10). Selon le procédé et appareil de la présente invention, le point d'introduction de la mousse aqueuse dans le coulis de plâtre cuit est placé de manière à ce que ladite mousse soit moins agitée que le plâtre cuit, ce qui réduit à un minimum la destruction de la mousse tout en dispersant malgré tout uniformément la mousse dans ledit coulis. On y parvient, par exemple, en plaçant un orifice d'entrée (32) de mousse plus près de l'orifice d'évacuation d'une chambre de mélange (40) de coulis que l'orifice d'entrée du coulis de plâtre cuit (20), ou en plaçant l'orifice d'entrée (32, 34, 36) de mousse dans une conduite d'évacuation (42, 46, 48) reliée à l'orifice d'évacuation de la chambre de mélange de coulis.

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