Cementitious Board Manufacture
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United States of America Patent
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Issued Date -
Jun 3, 2010
app pub date -
Oct 17, 2006
filing date -
Oct 19, 2005
priority date (Note) -
Abandoned
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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.
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