Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1979-11-07
1981-05-05
Kendell, Lorraine T.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
156 39, 156 42, 162156, 264121, 264284, 264333, 264518, 428426, 428432, 428446, 428703, B32B 300, B32B 904, C04B 4302
Patent
active
042659795
ABSTRACT:
A fiber-reinforced cementitious sheet is formed by first co-mixing in an air current 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 by means of the air current to form a sheet, applying water as by spraying in at least an amount which is stoichiometrically sufficiently to hydrate the calcium sulfate hemihydrate to the dihydrate form and to provide the necessary degree of plasticity to the mixture, densifying the sheet by compression, and setting and drying the sheet. A pair of sheets may be utilized as face sheets and, prior to setting, combined with a core 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 having excellent strength, surface hardness, and fire-resistant properties.
REFERENCES:
patent: 2230880 (1941-02-01), Brown
patent: 2544019 (1951-03-01), Heritage
patent: 2886484 (1959-05-01), French et al.
patent: 3381069 (1968-04-01), Simison
patent: 3470977 (1969-10-01), Shannon
patent: 4195110 (1980-03-01), Dierks et al.
Baehr Donald O.
Izard David G.
Kendell Lorraine T.
Kurlandsky Samuel
Roberts Kenneth E.
Robinson Robert H.
United States Gypsum Company
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