The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2008
Filed:
Nov. 10, 2003
Bruno Callais, Carpentras, FR;
Paul Jallon, Bordeaux, FR;
Jean Louis Laurent, Bayas, FR;
Michel Rigaudon, Saint-Loubes, FR;
Bruno Callais, Carpentras, FR;
Paul Jallon, Bordeaux, FR;
Jean Louis Laurent, Bayas, FR;
Michel Rigaudon, Saint-Loubes, FR;
LaFarge Platres, Avignon, Cedex, FR;
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 () and into a second mixer (); feeding in a facing (); preparing a first gypsum slurry in the first mixer (); preparing a second gypsum slurry in the second mixer (); 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.