Gypsum moldings as building materials and methods manufacturing the said gypsum moldings
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United States of America Patent
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-
Dec 16, 1980
Grant Date -
N/A
app pub date -
May 26, 1978
filing date -
May 30, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gypsum moldings as building materials having high strength is obtained by use of fibrous .alpha.-calcium sulfate hemihydrate as a raw material. There are two methods manufacturing the said gypsum moldings. One of them is the wet method and the other is the dry method. The wet method essentially consists of mixing fibrous .alpha.-calcium sulfate hemihydrate suspension with reinforcers et al., papering and dehydrating the resulting mixed suspension, with or without pressing the resulting wet mat, curing and drying the mat to obtain a gypsum moldings as building materials having high strength. The dry method is roughly divided into two methods. One of them comprises adding water to fibrous .alpha.-calcium sulfate hemihydrate and molding the resulting wet hemihydrate, and the other comprises molding fibrous .alpha.-calcium sulfate hemihydrate and adding water to the resulting moldings.
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