High density interface gypsum board and method for making same

Details High density interface gypsum board and method for making same High density interface gypsum board and method for making same

1980-10-27

1982-04-27

Van Balen, William J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

156 43, 156 44, 156 78, 428 70, 428703, 4283055, 4283166, 4283124, B32B 514, B32B 520, B32B 1308, B32B 3112

Patent

active

043271464

ABSTRACT:
A gypsum wallboard, and the method of manufacture, wherein a defoamer is disposed at the gypsum-paper interface during manufacture, causing the foam, present in the core forming gypsum slurry, to break down at the gypsum-paper interface, increasing substantially the density of the gypsum at the interface, relative to the density throughout the center portion of the gypsum core.

REFERENCES:
patent: 1511500 (1924-10-01), Brookley
patent: 3307987 (1967-03-01), Bieri
patent: 3389042 (1968-06-01), Bieri et al.
patent: 3481829 (1969-12-01), Shull et al.
patent: 3516882 (1970-06-01), Cummisford
patent: 4009062 (1977-02-01), Long
patent: 4051291 (1977-09-01), Long
patent: 4117183 (1978-09-01), Long
patent: 4119752 (1978-10-01), Long
patent: 4195109 (1980-03-01), Long

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