Gypsum wallboard process
AssigneeLafarge North America
InventorElizabeth Colbert
Life of this patent
Estimating the term…
Abstract
A method of manufacturing gypsum board includes applying compressed air to an input end of a tube, wherein the tube includes the input end, an output end, and a venturi located between the input end and the output end; admitting a foaming agent to the input end of the tube so as to form a mixture of the compressed air and the diluted foaming agent; passing the mixture through the venturi and out the output end; combining the mixture with gypsum and water to form a gypsum slurry; and casting the gypsum slurry onto a continuous web for forming a gypsum board.
Claims13
A method of manufacturing gypsum board, comprising:
- applying compressed air to an input end of a tube, wherein the tube includes the input end, an output end, and a venturi located between the input end and the output end;
- admitting foaming agent to the input end of the tube so as to form a mixture of the compressed air and the foaming agent;
- passing the mixture through the venturi and out the output end;
- combining the mixture with gypsum and water to form a gypsum slurry;
- and
- casting the gypsum slurry onto a continuous web for forming a gypsum board.
A method of manufacturing gypsum board, comprising:
- applying compressed air to an input end of a tube, wherein the tube includes the input end, an output end, and a tapered region between the input end and the output end, wherein a diameter of the tube decreases in the downstream direction in the tapered region;
- admitting a foaming agent to the input end of the tube so as to form a mixture of the compressed air and the foaming agent;
- passing the mixture through the tapered region and out the output end;
- combining the mixture with gypsum and water to form a gypsum slurry;
- and
- casting the gypsum slurry onto a continuous web for forming a gypsum board.
An apparatus for manufacturing gypsum board, comprising:
- a foam generator including a tube having an input end, an output end, and a venturi located between the input end and the output end;
- a mixer for mixing gypsum powder and water into a gypsum slurry;
- a passage for delivering the gypsum slurry to a facing sheet on a conveyor;
- and
- a conduit for delivering foam from the foam generator to either the mixer or a portion of the apparatus between the mixer and the conveyor.
An apparatus for manufacturing gypsum board, comprising:
- a foam generator including a tube having an input end, an output end, and a tapered region located between the input end and the output end;
- a mixer for mixing gypsum powder and water into a gypsum slurry;
- a passage for delivering the gypsum slurry to a facing sheet on a conveyor;
- a conduit for delivering foam from the foam generator to either the mixer or a portion of the apparatus between the mixer and the conveyor.
Dependencies are inferred from the claim text.