Abstract: A process for manufacturing set cellular cement, including the steps of: (i) mixing cementitious material, water, foaming agent and optionally additives into a free flowing slurry having a slump of at least 100 mm; subsequently (ii) injecting and distributing air into the slurry of step (i) to form a cellular slurry; subsequently (iii) casting the cellular slurry of step (ii); and finally allowing the cellular slurry to set. And, an apparatus for carrying out the process.

Abstract: A plaster slurry composition includes plaster, water and starch, the starch having a Brookfield viscosity of less than 60 cps at a temperature below 60° C. and a Brookfield viscosity greater than 10,000 cps at a temperature of 70° C.

Abstract: A process for manufacturing set cellular cement, including the steps of: (i) mixing cementitious material, water, foaming agent and optionally additives into a free flowing slurry having a slump of at least 100 mm; subsequently (ii) injecting and distributing air into the slurry of step (i) to form a cellular slurry; subsequently (iii) casting the cellular slurry of step (ii); and finally allowing the cellular slurry to set. And, an apparatus for carrying out the process.

Abstract: A plaster slurry composition includes plaster, water and starch, the starch having a Brookfield viscosity of less than 60 cps at a temperature below 60° C. and a Brookfield viscosity greater than 10,000 cps at a temperature of 70° C.

Abstract: A plaster slurry composition includes plaster, water and starch, the starch having a Brookfield viscosity of less than 60 cps at a temperature below 60° C. and a Brookfield viscosity greater than 10,000 cps at a temperature of 70° C.

Abstract: A plaster slurry composition includes plaster, water and starch, the starch having a Brookfield viscosity of less than 60 cps at a temperature below 60° C. and a Brookfield viscosity greater than 10,000 cps at a temperature of 70° C.

Abstract: The invention relates to a method of manufacturing sheets based on hydraulic binder, particularly sheets of plasterboard with feathered edges. The method comprises the steps of (I) making a mark (301) on a facing (2 or 3) of the preform (5), (II) detecting the mark (301), and (III) sending an actuating signal to a device (9) for cutting the preform (5). The invention also relates to a production line for producing such sheets, and to an apparatus, particularly for making an impression (12, 12bis) in a preform (5). The apparatus comprises a frame (101), first (102, 103) and second (105, 106) pulleys, two belts (108, 109) wrapped around the pulleys (102, 103, 105, 106), and at least one wire (111) extending between these belts (108, 109) so that its axis is parallel to the axis of the pulleys (102, 103, 105, 106).

Abstract: A production line for producing sheets based on hydraulic binder, the production line including in an upstream zone of the production line, marking device for marking a facing material of the preform with a mark; in a downstream zone of the production line, detecting device for detecting the mark made by the marking device; a cutting device; and an actuating device for actuating said cutting device after receiving a detection signal from the detection device.

Abstract: A plaster slurry composition includes plaster, water and starch, the starch having a Brookfield viscosity of less than 60 cps at a temperature below 600 C and a Brookfield viscosity greater than 10,000 cps at a temperature of 700 C.

Abstract: A process for manufacturing plasterboard and a plasterboard manufacturing unit are provided, the process including feeding hydratable calcium sulphate and water into a first mixer (2) and into a second mixer (3); feeding in a facing (5); preparing a first gypsum slurry in the first mixer (2); preparing a second gypsum slurry in the second mixer (3); applying the first slurry onto the facing and forming a crude surface layer; applying the second slurry onto the crude surface layer and forming a crude core layer with a density lower than that of the crude surface layer; forming a plasterboard; hydrating and drying the board. This process allows the formation of the different layers of gypsum to be controlled independently.

Abstract: A process for manufacturing set cellular cement, including the steps of: (i) mixing cementitious material, water, foaming agent and optionally additives into a free flowing slurry having a slump of at least 100 mm; subsequently (ii) injecting and distributing air into the slurry of step (i) to form a cellular slurry; subsequently (iii) casting the cellular slurry of step (ii); and finally allowing the cellular slurry to set. And, an apparatus for carrying out the process.

Abstract: A continuous process for manufacturing a sound absorbing tile made from a slurry including, quick setting cement, water, fibers and foaming agent, the process including the steps of (i) mixing cementitious material, water, foaming agent but without incorporation of prefabricated foam with fibers into a slurry; subsequently; (ii) injecting and distributing air into the slurry of step (i) to form a cellular slurry; subsequently; (iii) forming tiles or precursor products of tiles from the cellular slurry; and finally; (iv) allowing the cellular slurry to set into the desired tile or a precursor thereof.

Abstract: A continuous process for manufacturing a sound absorbing tile made from a slurry including, quick setting cement, water, fibers and foaming agent, the process including the steps of (i) mixing cementitious material, water, foaming agent but without incorporation of prefabricated foam with fibers into a slurry; subsequently; (ii) injecting and distributing air into the slurry of step (i) to form a cellular slurry; subsequently; (iii) forming tiles or precursor products of tiles from the cellular slurry; and finally; (iv) allowing the cellular slurry to set into the desired tile or a precursor thereof.

Abstract: The invention relates to a process for reducing the sagging of a gypsum-based element, such as a gypsum board. This process comprises the introduction into the gypsum-based composition, before the setting and hardening of the latter, of tartaric acid or tartaric acid salt(s), in a quantity greater than 0.001% by weight with respect to the weight of the calcium sulphate semihydrate contained in the gypsum-based composition. The invention also relates to a gypsum-based composition for such an element. This composition comprises, in percentages by weight with respect to the weight of the calcium sulphate semihydrate in the composition, from 0.003% to 0.45% of tartaric acid or tartaric acid salt(s) and from 0.05% to 0.95% of boric acid or boric acid salt(s).

Abstract: A process for manufacturing set cellular cement, including the steps of: (i) mixing cementitious material, water, foaming agent and optionally additives into a free flowing slurry having a slump of at least 100 mm; subsequently (ii) injecting and distributing air into the slurry of step (i) to form a cellular slurry; subsequently (iii) casting the cellular slurry of step (ii); and finally allowing the cellular slurry to set. And, an apparatus for carrying out the process.

Abstract: The invention relates to a method of manufacturing sheets based on hydraulic binder, particularly sheets of plasterboard with feathered edges. This method comprises the steps of: 1) making a mark (301) on a facing (2 or 3) of the preform (5); 2) detecting the mark (301); and 3) sending an actuating signal to a device (9) for cutting the preform (5). The invention also relate to a production line for producing such sheets, and to an apparatus, particularly for making an impression (12, 12bis) in a preform (5). This apparatus comprises: a frame (101); first (102, 103) and second (105, 106) pulleys; two belts (108, 109) wrapped around the pulleys (102, 103, 105, 106); at least one wire (111) extending between these belts (108, 109) so that its axis is parallel to the axis of the pulleys (102, 103, 105, 106).

Abstract: A production line for producing sheets based on hydraulic binder, the production line including in an upstream zone of the production line, marking device for marking a facing material of the preform with a mark; in a downstream zone of the production line, detecting device for detecting the mark made by the marking device; a cutting device; and an actuating device for actuating said cutting device after receiving a detection signal from the detection device.

Abstract: A process for manufacturing plasterboard and a plasterboard manufacturing unit are provided, the process including feeding hydratable calcium sulphate and water into a first mixer (2) and into a second mixer (3); feeding in a facing (5); preparing a first gypsum slurry in the first mixer (2); preparing a second gypsum slurry in the second mixer (3); applying the first slurry onto the facing and forming a crude surface layer; applying the second slurry onto the crude surface layer and forming a crude core layer with a density lower than that of the crude surface layer; forming a plasterboard; hydrating and drying the board. This process allows the formation of the different layers of gypsum to be controlled independently.