Method for the production of glass fiber-reinforced gypsum sheet

Details Method for the production of glass fiber-reinforced gypsum sheet Method for the production of glass fiber-reinforced gypsum sheet

1978-06-05

1980-11-11

Kendell, Lorraine T.

Stock material or miscellaneous articles

Composite

Of carbohydrate

162156, 264121, 264284, 264333, 264518, 428426, B28B 300, B32B 904, C04B 4302

Patent

active

042333687

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 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 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: 1862318 (1932-06-01), Ruby
patent: 2230880 (1941-02-01), Brown
patent: 2658848 (1953-11-01), Labino
patent: 2886484 (1959-05-01), French et al.
patent: 3470977 (1969-10-01), Shannon
patent: 3616173 (1971-10-01), Green
patent: 3773533 (1973-11-01), Omoto et al.
patent: 3852081 (1974-12-01), Lehman
patent: 4090883 (1978-05-01), Rauschenfels

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