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US 5,368,663 AGranted
Process for producing plate-shaped bodies made of a mixture of plaster and fibrous materials and installation for implementing
AssigneeBabcock BSH Aktiengesellschaft Vormals Buttner-Schilde-Haas AG
InventorJorg Bold
Life of this patent
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Abstract
Plasterboard is made by first spreading a mixture of plaster, fibers and er and then pressing this moist mixture to form the raw board. The upper and lower surfaces of the raw board are then wetted and the thus wetted raw board is pressed with a pressure less than the original consolidation pressure.
Claims7
A process for producing plasterboard from a mixture of plaster and a fibrous material, comprising the steps of:
- (a) forming a moist mixture of plaster, fibrous material and water with the water content amounting 22 to 28% by weight of the dry mixture;
- (b) spreading said moist mixture to form a mat;
- (c) pressing said mat into a raw board with a pressure at least sufficient to compact said raw board into a coherent structure;
- (d) thereafter afterwetting an upper side and an underside of said raw board with 200 to 1000 g/m.sup.2 of water;
- (e) afterpressing the afterwetted raw board with a pressure at least as high as a pressure applied in step (c);
- (f) thereafter setting and drying the afterpressed raw board;
- and
- (g) in the afterwetting of the upper side and underside of the raw board, initially determining an amount of water applied to said underside and thereafter adjusting the amount of water applied to said upper side in accordance with the amount of water applied to said underside.
5 more elements
A process for producing plasterboard from a mixture of plaster and a fibrous material, comprising the steps of:
- (a) forming a moist mixture of plaster, fibrous material and water with the water content amounting to 22 to 28% by weight of the dry mixture;
- (b) spreading said moist mixture to form a mat;
- (c) pressing said mat into a raw board with a pressure at least sufficient to compact said raw board into a coherent structure;
- (d) thereafter afterwetting an upper side and an underside of said raw board with 200 to 1000 g/m.sup.2 of water;
- (e) afterpressing the afterwetted raw board with a pressure at least as high as a pressure applied in step (c);
- (f) thereafter setting and drying the afterpressed board, the pressure applied to said raw board during afterpressing in step (e) being between 0.5 and 2 MPa and corresponding to 50 to 100% of the pressure applied in step (c).
3 more elements
Dependencies are inferred from the claim text.