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8016961 |
Gypsum wallboard and method of making same
A coalescing additive is used in the manufacturing process for gypsum wallboard. Such an additive increases the surface area and density of the slurry at the paper to core interface by coalescing...
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7819993 |
Method for producing light gypsum board
Provided is a method of manufacturing a weight-saved foamed gypsum board having a gypsum core with high strength and excellent adhesion properties of the gypsum core with base papers for gypsum...
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7776170 |
Fire-resistant gypsum panel
A method of continuously forming a multilayer panel includes making a gypsum slurry, then dividing the gypsum slurry into at least a primary gypsum slurry and a secondary gypsum slurry. An additive...
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7718019 |
Methods of and systems for preparing a heat resistant accelerant slurry and adding the accelerant slurry to a post-mixer aqueous dispersion of calcined gypsum
Methods and systems are provided for preparing a heat resistance accelerator (HRA) slurry. Also provided are methods and systems for introducing a HRA slurry to an aqueous dispersion of calcined...
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7686902 |
Method of fabricating plaster board
There is provided a lightweight plaster board having a cellular porous plaster core, excellent in adhesion to a covering base paper for a plaster board, free from dry-out in side edge parts of the...
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7470338 |
Process for forming dense layers in a gypsum slurry
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...
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6994769 |
In-situ cleaning of a polymer coated plasma processing chamber
An apparatus configured to remove chamber deposits between process operations is provided. The processing chamber includes a top electrode in communication with a power supply. A processing chamber...
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6716293 |
Wallboard with fly ash
A composition used in making wallboard is provided. The composition requires at least fly ash, water and a first binder. The composition is located between two members that together form the...
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6706128 |
Method of providing void space in gypsum wallboard and in a gypsum core composition
The invention provides a method of providing void spaces in gypsum wallboard and in a gypsum core composition such that the weight of the gypsum product is reduced without deleteriously affecting...
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6689238 |
Labelling system
An applicator 16 is used to apply a label 10 to a shaped CD ROM (not shown). The applicator 16 comprises a central projection 18 and peripheral locator pins 20a and 20b, as well as a well 22 in...
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6682617 |
Method for making wallboard or backerboard sheets including aerated concrete
A method for making wallboard or backerboard sheets which are relatively lightweight, strong, and which have good fire resistance, thermal insulation, and sound absorbing properties includes...
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6632550 |
Gypsum-containing product having increased resistance to permanent deformation and method and composition for producing it
The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material,...
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6541528 |
Flexible polymer foams, their production and use
Flexible polyurethane, polyacrylic and polybutadiene foams can be obtained with cyclopentane as a blowing agent and are useful as coatings for leather or leather substitutes.
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6488792 |
Method and apparatus for manufacturing cementitious panel with reinforced longitudinal edge
A cementitious panel comprising a cementitious core which is fabric-reinforced at the surface thereof and whose longitudinal edges are reinforced by a network of fibers. A panel may be obtained...
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6464880 |
Microporous ionomeric materials and methods of preparation
A method is provided for producing porous hydrophilic materials whereby nonporous materials are subjected to ester hydrolysis to generate site-specific perforations. Processes for separating...
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6395113 |
Process for producing a non-combustible moulded article, especially a building panel
A process is proposed for producing non-combustible moulded articles from blown vermiculite, the blown vermiculite granules being mixed with an inorganic binder and then pressed. The blown...
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5985061 |
Inorganic board and a method of manufacturing said inorganic board
An inorganic board consisting of an inorganic base layer formed by a paper making method and an inorganic surface layer formed by the dry method on said inorganic base layer is provided in the...
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5962119 |
Gypsum wallboard and process of making same
A process for continuously manufacturing gypsum board having a gypsum core and at least one fibrous cover sheet comprising: (A) applying a defoaming agent to the top surface of the fibrous sheet as...
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5922447 |
Lightweight gypsum board
A lightweight gypsum board is provided, including, by dry weight, gypsum as the largest single ingredient, perlite as the second largest single ingredient, and starch as a minor ingredient, in the...
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5908521 |
Method of manufacturing multilayer plasterboard
The apparatus includes a two-stage mixer formed within a single housing and including a first high shear mixer and a second low shear mixer. Plaster slurry is formed in the first mixer. A partition...
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5879486 |
Methods of manufacturing gypsum board and board made therefrom
Apparatus and method for producing gypsum board, comprising apparatus for coating a cover sheet with a relatively high density gypsum slurry, apparatus for forming edge borders on the sheet with...
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5804003 |
Method of manufacturing an inorganic board
The object of the present invention is to prevent delamination of an inorganic board. To attain this object, a method of manufacturing an inorganic board comprising forming a single mat by the...
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5714032 |
Method of manufacturing multilayer plasterboard and apparatus therefor
The apparatus includes a two-stage mixer formed within a single housing and including a first high shear mixer and a second low shear mixer. Plaster slurry is formed in the first mixer. A partition...
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5714001 |
Foaming agent composition and process
Surfactants containing a mixture of alkyl sulfate and alkyl ether sulfate in specific ratios are provided. Preferred compositions are blends of alkyl sulfate with narrow range alkoxylated alcohols...
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5643510 |
Producing foamed gypsum board using a foaming agent blend
This invention is a process and foaming system for producing foamed gypsum board which permits the production and control of large foam voids in the gypsum core by adjusting the ratio of a first...
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5391245 |
Fire-resistant building component
A method of, and compositions for, the making of a fire-resistant door core assembly. Doors produced from the door core assemblies. In the making of a door core assembly, an aqueous slurry...
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5264057 |
Process for the production of a flame resistant to nonflammable composite panel and apparatus for carrying out the process
A flame resistant to nonflammable composite panel is produced from a nonextrudable core mixture with a pourable, nonflammable filling material and a binder, and on both sides cover strips flexibly...
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5135805 |
Method of manufacturing a water-resistant gypsum composition
A method for incorporating siloxane into a water-resistant, gypsum-based article is disclosed, comprising, (A) adding said siloxane to water; (B) mixing said siloxane/water mixture with calcined...
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5085929 |
Gypsum board
In the improved gypsum board in accordance with this invention, the board has a gypsum core and first and second cover sheets of fibrous material on opposing faces. The core has a first stratum...
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5015449 |
Process for making construction grade calcium sulfate alpha-hemihydrate from moist finely divided gypsum obtained from a power plant flue gas desulfurization
The process makes calcium sulfate alpha-hemihydrate or essentially plaster of paris from finely divided gypsum made by desulfurizing flue gas obtain from a power plant fired by brown coal by...
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5015450 |
Process for making calcium sulfate alpha-hemihydrate from calcium sulfate dihydrate
The process makes calcium sulfate alpha-hemihydrate from finely divided calcium sulfate dihydrate by transforming the calcium sulfate dihydrate in the presence of saturated steam. A molded body is...
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4678515 |
Foam generating compositions
The sodium and/or ammonium salts of a mixture of n-alkyl oxyethylated sulfuric acids in aqueous solution, wherein all the compounds have the same molecular formula CH3 (CH2)x CH2 (OCH2 CH2)y OSO3 -...
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4643771 |
Production of water-repellent moldings from plaster
A water-repellent plaster molding is produced by forming a foam of water, surfactant and polyalkyl-hydrogen-siloxane adding this foam to a paste of plaster powder in water, and letting the mixture...
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4614553 |
Method of manufacturing acoustic panels for controlling reverberation of sound in enclosed environments
A method of manufacturing acoustic panels comprising the steps of pouring a solidifiable liquid into a container, placing a porous layer of material onto the solidifiable liquid, solidifying the...
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4518652 |
Method for forming a lightweight cementitious structural product and product formed thereby
A method for producing a lightweight set cementitious product, and more specifically, gypsum wallboard, having excellent strength and paper-to-core bond, which method comprises producing a foam...
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4327146 |
High density interface gypsum board and method for making same
A gypsum wallboard, and the method of manufacture, wherein a defoamer is disposed at the gypsum-paper interface during manufacture, causing the foam, present in the core forming gypsum slurry, to...
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4238546 |
Lightweight gypsum products and methods of making same
Disclosed is a method of making lightweight gypsum products wherein expanded substantially monocellular volcanic ash having a loose bulk density of about 0.05 to about 15 pounds per cubic foot is...
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4156615 |
Foaming agents for gypsum board manufacture
This invention relates to a novel means of manufacture of gypsum board. The improvement herein comprises the use of sodium and/or ammonium salts of ethoxylated, sulfated alcohols as foaming agents,...
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4057443 |
Foamed gypsum wallboard
Lightweight gypsum wallboard produced by continuously combining a small amount of surface active agent with a liquid stream which stream is made up of substantially all of the liquids to be used in...
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3912528 |
Additives to improve frothing agents in gypsum board manufacture
This invention relates to gypsum slurry and to a method for producing gypsum board which utilizes as a frothing agent a mixture comprising 5 to 40 weight per cent of a compound selected from the...
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3607605 |
COMPOSITE BUILDING MATERIAL
An improved composite building material, which comprises a pair of laminar articles, a core material made of mixed paste of foaming cement containing fibrous materials infused into a determined...
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3577248 |
LOW MOLECULAR WEIGHT LINEAR ALKYL BENZENE SULFONATE AS FROTHING AGENTS FOR GYPSUM BOARD MANUFACTURE
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3814659 |
NOVEL COMPOSITIONS
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3681253 |
COMPOSITION AND METHOD OF STABILIZING FOAM
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3486965 |
SAG-RESISTANT GYPSUM BOARD AND METHOD THEREFOR
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3359146 |
Method of producing gypsum articles having improved strength to density ratio
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3174188 |
Molds and process for using the same
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3025202 |
Method of manufacturing a fibrous product
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2985219 |
Process and apparatus for producing plasterboard
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