C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 28/14 (2006.01) B28B 1/52 (2006.01) B28B 5/02 (2006.01) B28B 7/46 (2006.01) B28B 13/02 (2006.01) B28B 17/02 (2006.01) B28B 19/00 (2006.01) C04B 11/00 (2006.01) C04B 11/26 (2006.01) C04B 18/24 (2006.01)
Patent
CA 2116137
2116137 9304008 PCTABS00020 Fibre-reinforced plaster plates are produced according to a single layer, continuous filtration process. A suspension of hemihydrate plaster and wet processed lignocellulose-containing fibres, preferably from used paper, is dewatered on a travelling screen. The apparent density of the plaster used is higher than 950 g/l, in the case of a .alpha.-hemihydrate plaster, and than 700 g/l, in the case of .beta.-hemihydrate plaster. In the RRSB-grid, the grain of the plaster has more than 40· gradient. .beta.-hemihydrate is aridized during calcination. The fibrous substance is pre-dewatered before being mixed with the plaster-fibre-suspension, then rediluted with water from the filtration process. The dewatering of the suspension is assisted in the last stage of vacuum filtration by vibrations or shearing forces. Devices for distributing the suspension and for generating the shearing forces are also disclosed.
Babcock-Bsh Aktiengesellschaft
Goudreau Gage Dubuc
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