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US 2010/0136259 A1Published application
Cementitious Board Manufacture
OwnerSam O'Keefe, Parnika Sahayinventors
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Abstract
A method of accelerating the setting reaction of calcium sulphate hemihydrate and water comprises the steps of mixing water and calcium sulphate hemihydrate to produce a slurry, adding an accelerator to said mixture, and applying ultrasonic energy to said mixture. Application of ultrasound to the plaster slurry accelerates crystallization and thus reduces the setting time. A further benefit is reduced density of the wall boards.
Claims37
A method of accelerating the setting reaction of calcium sulphate hemihydrate and water comprising the steps of:
- mixing the water and the calcium sulphate hemihydrate to produce a slurry;
- adding an accelerator to the slurry;
- and
- applying ultrasonic energy to the slurry.
1 more element
An apparatus for manufacturing gypsum wall board comprising:
- a mixer for combining calcium sulphate hemihydrate and water to create a slurry;
- and
- a mixer outlet for depositing the slurry onto paper located on a conveyor;
- wherein the mixer includes means for supplying ultrasonic energy to the slurry.
1 more element
Dependencies are inferred from the claim text.