Process for forming dense layers in a gypsum slurry

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

2003-11-10

2008-12-30

Maki, Steven D (Department: 1791)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

C156S043000, C156S044000, C366S010000, C366S015000, C366S020000, C366S038000

Reexamination Certificate

active

07470338

ABSTRACT:
A process for manufacturing plasterboard and a plasterboard manufacturing unit are provided, the process including 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.

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Translation for Japan 05-148001 (Dec. 2007).

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