Gypsum boards and methods for making them
OwnerDahlia Amato, Remi Lespiat +1inventors
InventorsDahlia Amato, Remi Lespiat, Marion Grange
Life of this patent
Estimating the term…
Abstract
The present disclosure relates generally to a gypsum board comprising a gypsum core, the gypsum core comprising: a set body of calcium sulfate dihydrate; and a mixture of starches. The set gypsum core is made allowing a stucco slurry containing the starches to set. The mixture of feed starches comprises a first starch and a second starch, the first starch having a substantially lower peak viscosity than the second starch.
Claims20
A gypsum board comprising a set gypsum core, wherein the set gypsum core comprises:
- a set body of calcium sulfate dihydrate;
- and
- a mixture of starches;
- wherein the set gypsum core is made by the method comprising:
- providing a slurry comprising stucco, water, and a mixture of feed starches, the mixture having a peak viscosity in the range of 50 to 600 BU and/or in the range of 50-600 centipoise, the mixture of feed starches being present in an amount in the range of 0.05 wt % to 3 wt % of the weight of the stucco, based on the gypsum core of the gypsum board;
- allowing the slurry to set to form a wet gypsum core;
- and
- drying the wet gypsum core at a temperature in the range of 50-350° C. to provide a set gypsum core,
- wherein the mixture of feed starches comprises a first starch and a second starch, the first starch having a substantially lower peak viscosity than the second starch.
A method of forming a gypsum board comprising a gypsum core, the method comprising:
- providing a slurry comprising stucco, water, and the mixture of feed starches having a peak viscosity in the range of 50 to 600 BU, the mixture of feed starches being present in an amount in the range of 0.05-3 wt % of the stucco;
- allowing the slurry to set to form a wet gypsum core;
- and
- drying the wet gypsum core at a temperature in the range of 50-350° C. to provide a set gypsum core,
- wherein the mixture of feed starches comprises a first starch and a second starch, the first starch having a substantially lower peak viscosity than the second starch.
Dependencies are inferred from the claim text.