Saint-gobain Placo S.a.s.

Saint-gobain Placo

Richard Morlat

Jean-Louis Mongrolle

James Fletcher

Radomir Kamler

Paul-Henri Guering

Hamouda Jaffel

Yves Benkemoun

Remi Jean

Dariusz Drag

Marie-Virginie Ehrensperger

Philippe Laval

Christelle Pousse

Jean Louis Mongrolle

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.

An apparatus for preparing foam for incorporation into cementitious slurry comprises a conduit having an inlet for receiving a gas feed and a surfactant feed, and an outlet for allowing the exit of foam. The conduit houses a porous plug that provides a partial barrier to fluid flow along the conduit, the plug comprising a plurality of particles that are packed in a regular array and that define a three-dimensional network of pores extending therebetween. The apparatus comprises a resilient component located between the plug and the conduit.

Apparatus and method for the production of foam

A pressing assembly () and a method for forming a depression () within a moving, wet gypsum board () is disclosed. The assembly comprises a pressing head () comprising a pressing surface which is arranged to contact the board, and a support member (), the pressing head () being arranged to compress a portion of the board between the pressing surface and the support member () to form a depression () within the board (). The pressing surface comprises a first and second surface portion () separated by a relief portion (), which is arranged to press the board () toward the support head () with less compressive force than the first and second surface portion (). The assembly further comprises drive means () for moving the pressing head and the support member in a first direction which substantially corresponds with the direction of the moving board, and a second direction which is substantially perpendicular to a plane of the board, while the speed of the pressing assembly in the first direction substantially matches the speed of the board.

Pressing assembly and a method for forming a depression within a moving, wet gypsum board

An actuator for controlling the operation of an apparatus comprises a panel () and an acoustic sensor (). The panel provides a partition within a building structure, while the acoustic sensor is adapted to detect acoustic waves propagating through the panel. When a user exerts pressure against the panel, the sensor detects the acoustic waves that are formed and emits signals for controlling the operation of an apparatus, such as a doorbell, a light source, a television, a sound system, a ventilation system, a window blind, a radio or an alarm.

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Vaujours, France

Richard Morlat