Saint-gobain Placo S.a.s.

Saint-gobain Placo

Radomir Kamler

Richard Morlat

Hamouda Jaffel

James Fletcher

Guillaume Saingier

Andrea Ranzani Da Costa

A method for continuously forming gypsum-based panels of high fixing strength comprises the steps of: &#x2022;forming a mixture comprising stucco, non-pregelatinized migratory starch, glass fibre, fluidizer and water; &#x2022;casting the mixture in a continuous band; &#x2022;maintaining the band under conditions sufficient for the stucco to form an interlocking matrix of set gypsum; &#x2022;cutting the band to form one or more wet panel precursors; and &#x2022;drying the wet panel precursor to form one or more gypsum-based panels. &#x2022;The weight ratio of water to stucco in the mixture is less than 0.7; &#x2022;the stucco is present in the mixture in an amount of over 60 wt % relative to the total solids content of the mixture; &#x2022;the starch is present in the mixture in an amount of over 3 wt % relative to the stucco; &#x2022;the glass fibre is present in the mixture in an amount of over 1 wt % relative to the stucco; &#x2022;the fluidizer is present in the mixture in an amount of at least 0.1 wt % relative to the stucco; and the density of the gypsum-based panel is greater than 700 kg/m.

Method for the production of gypsum-based boards and stucco slurry comprising non-pregelatinized migratory starch for use therewith

A method for continuously forming gypsum-based panels of high fixing strength comprises the steps of: &#x2022; forming a mixture comprising stucco, non-pregelatinized migratory starch, glass fibre, fluidizer and water; &#x2022; casting the mixture in a continuous band; &#x2022; maintaining the band under conditions sufficient for the stucco to form an interlocking matrix of set gypsum; &#x2022; cutting the band to form one or more wet panel precursors; and &#x2022; drying the wet panel precursor to form one or more gypsum-based panels. &#x2022; The weight ratio of water to stucco in the mixture is less than 0.7; &#x2022; the stucco is present in the mixture in an amount of over 60 wt % relative to the total solids content of the mixture; &#x2022; the starch is present in the mixture in an amount of over 3 wt % relative to the the stucco; &#x2022; the glass fibre is present in the mixture in an amount of over 1 wt % relative to the stucco; &#x2022; the fluidizer is is present in the mixture in an amount of at least 0.1 wt % relative to the stucco; and the density of the gypsum-based panel is greater than 700 kg/m.

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Prague, Czechia

Radomir Kamler