Gypsum board

Details Gypsum board Gypsum board

B - Operations, Transporting

28

B

154/114, 154/69

B28B 19/00 (2006.01) B32B 5/20 (2006.01) B32B 13/08 (2006.01) B32B 13/14 (2006.01) C04B 28/14 (2006.01) E04C 2/04 (2006.01)

Patent

CA 2008834

In the improved gypsum board in accordance with this invention, the board has a gypsum core and first and second cover sheets of fibrous material on opposing faces. The core has a first stratum parallel to and adjacent the first cover sheet. This stratum does not contain any fibers of the fibrous material. This first stratum has relatively few voids and a substantially greater density than the central portion of the core of the board. The central portion of the core has a plurality of relatively large discrete voids substantially uniformly distributed throughout the central portion of the core. These voids have substantially spherical coherent walls.

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