Gypsum board

Details Gypsum board Gypsum board

1989-02-17

1992-02-04

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

156 39, 156 43, 156 45, 4283105, 4283122, 4283124, 4283144, 4283186, 428703, B32B 326

Patent

active

050859293

ABSTRACT:
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.

REFERENCES:
patent: 3516882 (1970-06-01), Cummisford
patent: 4156615 (1979-05-01), Cukier
patent: 4288263 (1981-09-01), Delcoigne et al.
patent: 4298394 (1981-11-01), Loeming et al.
patent: 4327146 (1982-04-01), White
patent: 4351867 (1982-09-01), Mulvey et al.
patent: 4618370 (1986-10-01), Green et al.

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