Hard-edge wallboard

Details Hard-edge wallboard Hard-edge wallboard

1980-02-11

1981-07-21

Simmons, David A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

427284, 428305, B32B 1300, B05D 500, B32B 326

Patent

active

042796733

ABSTRACT:
A method of making gypsum wallboard in which a portion of the conventional foamed gypsum slurry for forming the wallboard core is fed through a relatively low speed agitator wherein a defoaming agent is thoroughly admixed therewith, and this portion of the slurry is then disposed along the edge portion of the wallboard being formed, whereby a hard-edge wallboard is produced using less energy than used with prior methods for making a hard-edge wallboard.

REFERENCES:
patent: 2762738 (1956-09-01), Teale
patent: 2985219 (1961-05-01), Summerfield

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