Adhesive bonding and miscellaneous chemical manufacture – Methods – Plaster board making
Patent
1976-02-27
1980-02-05
Goolkasian, John T.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Plaster board making
106110, 156 44, 156 45, B32B 318
Patent
active
041871308
ABSTRACT:
A method for forming shaped articles from glass fiber reinforced gypsum. An aqueous slurry of calcium sulfate hemihydrate, water and glass fibers contains between 22 and 45 parts by weight water, 100 parts by weight calcium sulfate hemihydrate and 3 to 10 parts by weight glass fiber. The slurry is provided as a continuous ribbon on a moving, water-impermeable first membrane. A water-impermeable second membrane is applied above the continuous ribbon and sealed along its side edges to the side edges of the first membrane to form a sandwich consisting of the two membranes and the slurry ribbon.
The sandwich is shaped prior to the setting of the gypsum and is retained in the desired shape until initial setting occurs. Thereafter at least a portion of one of the two membranes is removed and substantially all of the uncombined water is removed from the shaped ribbon.
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patent: 2991824 (1961-07-01), Loechl
patent: 3047447 (1962-07-01), Stasse
patent: 3062670 (1962-11-01), Marzocchi et al.
patent: 3616173 (1971-10-01), Green et al.
patent: 3964944 (1976-06-01), Gwynne
Mechanical Properties of glass fibre reinforced gypsum; Ali et al.; Journal of Materials Science; 5/69.
Gallagher J. J.
Goolkasian John T.
H. H. Robertson Company
Keck Harry B.
Manias George E.
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