Method for producing shaped glass fiber reinforced gypsum articles
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United States of America Patent
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-
Feb 5, 1980
Issued Date -
N/A
app pub date -
Feb 27, 1976
filing date -
Jun 28, 1974
priority date (Note) -
Expired
status (Latency Note)
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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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