Babcock-bsh Gmbh

Babcock-bsh Aktiengesellschaft Vormals Buttner-schilde-haas Ag

Babcock Bsh Aktiengesellschaft

Horst Hose

Friedrich Bahner

Helmut Eidam

Karl Maurer

Frank Ullsperger

Kurt Braun

Kurt Eberhardt

Josef Steinkuhl

Gerald Forbert

Heinrich Blackert

Josef Stipek

Karl Freisinger

A porous paste, especially a plaster paste or slurry for producing sandwich-type plasterboard, is made in a disk-shaped mixer having a rotor rotatable in a mixing chamber by introducing compressed air or other pressurizable gas through a wall or bottom segment directly into the chamber so that the incoming pressurized gas meets the mixture with a shearing action along the wall or bottom.

Method of producing a porous paste, especially a porous plaster slurry, and a mixer for preparing such paste or slurry

In the process for making gypsum fiberboard the boards are formed or molded rom a mash containing calcium sulfate dihydrate and fiberous material. By heating and subsequently cooling the boards the dihydrate is first converted into the hemihydrate and subsequently recrystallized again to the dihydrate. Known processes require day line setting times which are economically disadvantageous. According to the present invention these times are shortened by pulling or drawing water, an aqueous solution or a water containing mixture through the boards after the cooling step. Advantageously a setting accelerating agent can be dissolved in the water. By these features the setting time can be shortened to less than two hours. By addition of a binding agent, e.g. starch, to the fluid drawn through the boards the strength of the boards is increased.

Process for making gypsum fiberboard

A method of and apparatus for producing gypsum fiber boards includes introducing shaped boards provided of a mash of calcium sulphate dihydrate and fibrous material and possibly additives after dewatering and shaping the mash into at least one pressure vessel and to heat the boards at saturated steam atmosphere to 120.degree.-160.degree. C. over a predetermined period. Thereafter, the boards are allowed to cool down within the pressure vessel to a temperature of about 100.degree. or less before being discharged therefrom.

Method of and apparatus for producing gypsum fiber boards (plasterboard)

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Kassel, Germany

Horst Hose