Process and device for forming dense layers in a gypsum slurry

Details Process and device for forming dense layers in a gypsum slurry Process and device for forming dense layers in a gypsum slurry

B - Operations, Transporting

28

B

B28B 19/00 (2006.01) B28B 17/02 (2006.01)

Patent

CA 2447561

A process for manufacturing plasterboard and a plasterboard manufacturing unit are provided, the process comprising feeding hydratable calcium sulphate and water into a first mixer (2) and into a second mixer (3); feeding in a facing (5); preparing a first gypsum slurry in the first mixer (2); preparing a second gypsum slurry in the second mixer (3); applying the first slurry onto the facing and forming a crude surface layer; applying the second slurry onto the crude surface layer and forming a crude core layer with a density lower than that of the crude surface layer; forming a plasterboard; hydrating and drying the board. This process allows the formation of the different layers of gypsum to be controlled independently.

L'invention concerne un procédé de fabrication de plaques de plâtre, comprenant les étapes de fourniture de sulfate de calcium hydratable et d'eau dans un premier (2) et dans un deuxième mixeur (3); de fourniture d'un parement (5); de préparation d'une première pâte de plâtre dans le premier mixeur (2); de préparation d'une deuxième pâte de plâtre dans le deuxième mixeur (3); d'application de la première pâte sur le parement et de formation d'une couche de surface crue; d'application de la deuxième pâte sur la couche de surface crue et de formation d'une couche de coeur crue de densité inférieure à la densité de la couche de surface crue; de formation d'une plaque de plâtre; d'hydratation et de séchage de la plaque. Ce procédé permet de contrôler indépendamment la formation des différentes couches de plâtre. L'invention a également pour objet une unité de fabrication (1) de plaques.

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