Method of manufacturing multilayer plasterboard
AssigneeBPB Industries Public Limited Company
InventorsJohn Ainsley, John James Bradshaw, Arthur George Terry Ward
Life of this patent
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Abstract
The apparatus includes a two-stage mixer formed within a single housing and including a first high shear mixer and a second low shear mixer. Plaster slurry is formed in the first mixer. A partition is laid on a first fixing sheet, a portion laid on a second fixing sheet, and the remainder discharged to the second mixer. In the second mixer, foam is added and the formed slurry is laid on the unformed slurry on the first fixing sheet. The unformed slurry in the second fixing sheet is brought to the formed slurry to join the product.
Claims22
A method for making a multilayer set cementitious product comprising the following steps:
- (a) providing a dual-chambered mixer formed within a single housing, said dual-chambered mixer including a first mixing chamber and a second mixing chamber, said first mixing chamber having a top wall and an opposed bottom wall, said second mixing chamber having a top wall and an opposed bottom wall, a portion of said bottom wall of said first mixing chamber also being a portion of said top wall of said second mixing chamber;
- (b) dispersing particulate cementitious material in a liquid medium under conditions of relatively high shear in said first mixing chamber to form a first slurry;
- (c) blending a first portion of the first slurry with foam under conditions of relatively low shear in said second mixing chamber to form a second, foamed, slurry;
- (d) depositing a first layer of a second portion of the first slurry from the first mixing chamber on a support;
- and
- (e) depositing a second layer of the second slurry from the second mixing chamber on the surface of the first layer.
A method for making a multilayer set cementitious product comprising the following steps:
- (a) providing a dual-chambered mixer formed within a single housing, said dual-chambered mixer including a first mixing chamber and a second mixing chamber, said first mixing chamber having a top wall and an opposed bottom wall, said second mixing chamber having a top wall and an opposed bottom wall, a portion of said bottom wall of said first mixing chamber also being a portion of said top wall of said second mixing chamber;
- (b) dispersing particulate cementitious material in a liquid medium under conditions of relatively high shear in said first mixing chamber to form a first slurry;
- (c) blending a first portion of the first slurry with foam under conditions of relatively low shear in said second mixing chamber to form a second, foamed, slurry;
- (d) depositing a first layer of the second slurry from the second mixing chamber on a support;
- and
- (e) depositing a second layer of the second portion of the first slurry from the first mixing chamber on the surface of the first layer.
Dependencies are inferred from the claim text.