Improved gypsum wallboard and method of making same

Details Improved gypsum wallboard and method of making same Improved gypsum wallboard and method of making same

B - Operations, Transporting

28

B

B28B 19/00 (2006.01) B32B 13/02 (2006.01) B32B 13/08 (2006.01)

Patent

CA 2690881

A coalescing additive is used in the manufacturing process for gypsum wallboard. Such an additive increases the surface area and density of the slurry at the paper to core interface by coalescing the foam cells away from the paper core interface. This permits a stronger paper to core bond to form and increases the compressive strength of the gypsum wallboard as compared to standard wallboards made from slurries with reduced water levels.

L'invention consiste à utiliser un additif de coalescence dans le procédé de fabrication d'une plaque de plâtre. Un tel additif augmente la surface et la densité de la suspension épaisse à l'interface papier de parement/cur en faisant coalescer les alvéoles de mousse de l'interface papier de parement/cur. Ceci permet de former un collage papier de parement sur cur plus fort et augmente la résistance à la compression de la plaque de plâtre par rapport à des plaques de plâtre standards fabriquées à partir de suspensions épaisses ayant des teneurs en eau réduites.

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