Hard-edge wallboard

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B - Operations, Transporting

32

B

26/184

B32B 13/00 (2006.01) B28B 19/00 (2006.01) E04C 2/04 (2006.01)

Patent

CA 1151855

HARD-EDGE WALLBOARD ABSTRACT OF THE DISCLOSURE 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.

361672

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