Process for forming dense layers in a gypsum slurry
US7470338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 10, 2003 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Jun 5, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB28B19/0015
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.