Cementitious board manufacture

Details Cementitious board manufacture Cementitious board manufacture

B - Operations, Transporting

32

B

154/26

B32B 23/06 (2006.01) B28B 19/00 (2006.01) B32B 13/14 (2006.01)

Patent

CA 1213206

ABSTRACT CEMENTITIOUS BOARD MANUFACTURE In the manufacture of cementitious board by depositing a slurry of hydraulic cementitious material, commonly gypsum plaster, between two facing sheets, and forming it to the desired width and thickness prior to setting, the formation of voids in the core, due to air trapped in the slurry is avoided by vibrating the lower sheet (40), after the slurry (48) has been deposited on it and usually before the upper sheet (44) contacts the slurry, by a vibrating plate (49,51) which may be actuated mechanically or electromagnetic- ally and subsequently vibrating the upper sheet, when it comes into contact with the mass of cementitious slurry, by a second vibrating plate (50,51). The vibration of the lower sheet causes bubbles of unwanted trapped air to rise through the slurry towards the upper surface and the accumulated bubbles are then broken by the vibration of the upper sheet before they become incorporated into the formed board as voids.

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