Method of preparing gypsum products
AssigneeBPB Industries Public Limited Company
InventorJohn J. Bradshaw
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Abstract
The invention provides a method of making gypsum products such as plasterboard from foamed gypsum plaster slurry. The method uses a first mixing chamber 10 containing a high speed rotor 14 and inlets 18, 19 for gypsum plaster and water. The initial dispersion of gypsum plaster and water foamed in the first chamber passes directly and continuously into a second chamber 25 containing a low speed rotor 29. Preformed foam is introduced into the second chamber through an inlet 33, and the foamed slurry product leaves the second chamber through an outlet 34, to be formed into plasterboard.
Claims12
A method of preparing gypsum products comprising the steps of:
- (i) preparing a foamed slurry of a gypsum plaster comprising:
- (a) dispersing gypsum plaster in a liquid medium under conditions of shear to produce an initial dispersion;
- (b) blending the initial dispersion with a foam under conditions of lower shear than conditions under which step (i)(a) occurs;
- and
- (ii) forming the foamed slurry into a gypsum product.
Dependencies are inferred from the claim text.