Method for producing plaster fibreboards

Details Method for producing plaster fibreboards Method for producing plaster fibreboards

B - Operations, Transporting

28

B

25/111

B28B 1/52 (2006.01) B28B 21/56 (2006.01) C04B 28/14 (2006.01)

Patent

CA 1307096

ABSTRACT OF THE DISCLOSURE In accordance with the method of the invention, a suspension is prepared from wet disintegrated fibre material and calcium sulphate dihyrate. The suspension is drained and formed into a board, the dihydrate being recrystallized to a hemihydrate by heating at atmospheric pressure and being finally converted into the dihydrate again by the addition of water. The suspension is drained to a water content of between 300 and 600% and, on a drainage device, to a moisture content of between 30 and 40%, the dihydrate being recrystallized under atmospheric air, without pressure, to the .beta.-form of the hemihydrate, and the water necessary for setting is drawn through the boards.

577029

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