1241 results about "Cement board" patented technology

A feed apparatus for use in depositing a slurry upon a moving web having a direction of travel includes a main metering roll, a companion roll disposed in closely spaced relation to the metering roll to form a nip therebetween. The nip is constructed and arranged to retain a supply of the slurry, and the rolls are driven so that slurry retained in the nip progresses over an upper outer peripheral surface of the metering roll to be deposited upon the web. Also preferably included is a thickness control roll disposed in operational relationship to the metering roll for controlling thickness of a layer of slurry drawn from the nip over the outer metering roll surface. Preferably, the metering roll, the companion roll and the thickness control roll are driven in the same direction.

Lightweight, fiber reinforced, cementitious panels possessing exceptional toughness for use as building components in applications such as roofing elements, siding elements, framing and sheathing elements, and substrate elements for installation of floor finishes in residential and other building construction types. The panels employ a continuous phase resulting from the curing of an aqueous mixture of inorganic binder, PVA fibers and lightweight filler. The inorganic binder may be, for example, hydraulic cement alone, or a combination of hydraulic cement and pozzolan / s, or a combination of hydraulic cement, alpha hemihydrate, active pozzolan and optionally lime. The PVA fibers reinforce the continuous phase and are randomly distributed throughout the composite. Typical panels of the invention have a density of 60-85 pcf.

The invention provides a board forming system comprising a forming table comprising a belt with a surface for conveying a backing layer; a mixer fitted with a mechanism capable of depositing cementitious slurry material over a top surface of the backing layer; and a slurry spreader positioned downstream of the mixer, wherein a portion of the slurry spreader comprises a plurality of apertures which are connected to a source of pressurized fluid. The slurry spreader is configured such that the pressurized fluid flows out of the slurry spreader through the apertures so as to provide a continuous film of fluid across an outer surface of the slurry spreader. The slurry spreader is positioned such that it can contact at least a portion of the cementitious slurry after the slurry exits the discharge and before the slurry is spread across the width of the backing layer such that the thickness of the slurry is approximately equal to the desired slurry thickness for board formation. The invention further provides methods for forming cementitious board comprising the use of the slurry spreader.

A method of making a rapid setting composition for cement boards is disclosed. Compositions including portland cement, fly ash, gypsum, alkanolamine and phosphate are disclosed. A synergistic interaction between the alkanolamine and phosphate increases the effectiveness of accelerating reactions thus allowing for quick setting and increased early-age compressive strength compositions.

The invention discloses a lightweight nonbearing grouting wall and its construction method for inner walls of buildings, comprising a lightgage steel joist or C-shaped steel as a framework, two fiber cements covered on two sides, a hollow space within lightweight grouting materials by special equipment, and a skin layer decorated and dealt directly. The wall has a simple structure for easy construction and a light weight thereby reducing the cost of entire structure and improving the fireproof property up to 2.5 hours or more and the sound insulation property as 40dB, therefore the invention is an inner wall construction with higher utility and economic profit.

Fabric and reinforcements are provided by this invention which, in a first embodiment, include a plurality of warp yarns having a first twist (turns / inch) and a plurality of weft yarns having a second twist which is greater than the first twist. A coating is applied over a substantial portion of the warp and weft yarns after they are assembled or laid together, so as to produce a weight distribution ratio of less than about 2.0:1, based upon the weight of the resinous coating of the weft yarns over the weight of the resinous coating on the warp yarns. This can be achieved, in substantial part, due to the difference in the twist ratios of the warp and weft yarns, which difference permits a more uniform coating to be applied. Further embodiments of this invention include a cementitious board and methods of making a coated fabric and cementitious board.

A multi-layer process for producing structural cementitious panels, includes, a. providing a moving web; b. one of depositing a first layer of loose fibers upon the web and c. depositing a layer of settable slurry upon the web; d. depositing a second layer of loose fibers upon the slurry; e. embedding said second layer of fibers into the slurry; and f. repeating steps c. through e. until the desired number of layers of settable fiber-enhanced slurry in the panel is obtained. Also provided are a structural panel produced by the present process, an apparatus suitable for producing structural cementitious panels according to the present process, and a structural cementitious panel having multiple layers, each layer created by depositing a layer of settable slurry upon a moving web, depositing fibers upon the slurry and embedding the fibers into the slurry such that each layer is integrally formed with the adjacent layers.

The invention relates to a magnesium oxysulfate cement board and a method for preparing the same by using a semidry method. The magnesium oxysulfate cement board comprises a heat insulation core layer and strength structure layers respectively compounded on the two surfaces of the heat insulation core layer. The heat insulation core layer is a layer structure formed by stirring and pressing magnesium oxysulfate which is used as a gelatinizing agent and a light material which is used as a filler. Each strength structure layer is a layer structure formed by the magnesium oxysulfate which is used as the gelatinizing agent. The magnesium oxysulfate cement board disclosed by the invention has the outstanding substantive characteristics that a plate material with a multilayer composite structure is formed by mixing the magnesium oxysulfate utilized as the gelatinizing agent with the light material and / or a reinforcing fiber; the structure of the core layer has the characteristics of light weight and good heat preservation and heat insulation effects; the strength structure layers on the two surfaces of the core layer have the characteristics of bending resistance and high compression strength; and meanwhile, the magnesium oxysulfate cement board is low in PH value and has no chlorine content. Therefore, the occurrence of the moisture absorption and the halogenation are avoided; the corrosion on materials, such as plant fibers, metal pieces and the like, is avoided; and the application range is widened and the service life is prolonged.

The invention discloses a method for preparing a fiber composite material concrete board, which comprises the following steps: laying a first layer of slurry in a mould; laying a first layer of glass fiber grid cloth on the laid first layer of the slurry; laying a second layer of slurry on the laid first layer of the glass grid cloth; laying a second layer of glass fiber grid cloth on the laid second layer of the slurry; laying a third layer of slurry on the laid second layer of the glass fiber grid cloth; vibrating the mould by a vibration device; putting the mould into a steam autoclave; and performing autoclave leaving, demoulding, airing and final treatment to form the concrete board made of the fiber composite material. The invention also discloses a concrete board made of a fiber composite material. The method has the advantages of simple manufacturing process, little capital and equipment input and low cost; and the concrete board made of the fiber composite material has the advantages of low water absorbing rate, high strength, good toughness, high durability, and the like.

A process employing a wet mixer having a vertical mixing chamber for forming a wet slurry of a cementitious powder and liquid. The vertical mixing chamber is designed to provide the required amount of mixing to provide thoroughly mixed, uniformly thin slurry within a mixing residence time that allows for adequate supply of slurry to ensure continuous operation of an associated cement panel production line. Gravity feed for supply of cementitious powder and water to the slurry mixing area of the chamber is also disclosed.