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1. (WO1980000013) METHOD FOR THE PRODUCTION OF GLASS FIBER-REINFORCED GYPSUM SHEETS AND GYPSUM BOARD FORMED THEREFROM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1980/000013 International Application No.: PCT/US1979/000364
Publication Date: 10.01.1980 International Filing Date: 31.05.1979
IPC:
B28B 1/52 (2006.01) ,B32B 13/12 (2006.01) ,E04C 2/04 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
28
WORKING CEMENT, CLAY, OR STONE
B
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG OR MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
1
Producing shaped articles from the material
52
specially adapted for producing articles from mixtures containing fibres
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
13
Layered products essentially comprising a water-setting substance, e.g. concrete, plaster, asbestos cement, or like builders' material
04
comprising such substances as the main or only constituent of a layer, next to another layer of a specific substance
12
of synthetic resin
E FIXED CONSTRUCTIONS
04
BUILDING
C
STRUCTURAL ELEMENTS; BUILDING MATERIALS
2
Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
02
characterised by specified materials
04
of concrete or other stone-like material; of asbestos cement
Applicants:
Inventors:
Priority Data:
91277605.06.1978US
Title (EN) METHOD FOR THE PRODUCTION OF GLASS FIBER-REINFORCED GYPSUM SHEETS AND GYPSUM BOARD FORMED THEREFROM
(FR) METHODE DE FABRICATION DE FEUILLES DE PLATRERIE RENFORCEES AVEC DES FIBRES DE VERRE ET PLAQUES DE PLATRERIES FORMEES PAR CETTE METHODE
Abstract:
(EN) A fiber-reinforced cementitious sheet (94) is formed by first co-mixing in an air current duct (74) reinforcing fibers such as glass fibers, and cementitious mineral materials in finely particulate form such as calcium sulfate hemihydrate, both in substantially dry form, depositing the mixture on a moving foraminous surface (79) by means of the air current to form a sheet (87), applying water as by spraying (92) in at least an amount which is stoichiometrically sufficient to hydrate the calcium sulfate hemihydrate to the dihydrate form and to provide the necessary degree of plasticity to the mixture, densifying the sheet (87) by compression rolls (93), and setting and drying the sheet (94). A pair of sheets (94) may be utilized as face sheets and, prior to setting, combined with core (98) formed of for example a calcium sulfate hemihydrate slurry, and the sheets and core then set and dried to form a paper-free gypsum board (105) having excellent strength, surface hardness, and fire-resistant properties.
(FR) Une feuille a base de ciment (94) renforcee avec des fibres et formee premierement en melangeant dans un courant d"air (74) des fibres de renforcement telles que des fibres de verre et des materiaux mineraux a base de ciment en particules fines tels que l"hemihydrate de sulfate de calcium, les deux etant secs, puis en deposant le melange sur une surface perforee mobile (79) au moyen du courant d"air pour former une feuille (87), en appliquant de l"eau par vaporisation (92) en une quantite stoechiometrique pour hydrater l"hemihydrate de sulfate de calcium en une forme deshydratee et pour donner le degre de plasticite necessaire au melange, en densifiant la feuille (87) par compression a l"aide de rouleaux (93) puis en affermissant et sechant la feuille (94). Une paire de feuilles (94) peut etre utilisee et, avant la prise, elles peuvent etre combinees a un noyau (98) forme d"une pate d"hemidhydrate de sulfate de calcium, par exemple, les feuilles et le noyau sechent et prennent pour former une plaque sans papier (105) ayant une resistance, une durete superficielle, et des proprietes ignifuges excellentes.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)