Glass manufacturing – Processes – With pore forming in situ
Patent
1983-04-05
1985-11-12
Lindsay, Robert
Glass manufacturing
Processes
With pore forming in situ
106 74, 501 84, C03B 1908
Patent
active
045525773
ABSTRACT:
The present invention is directed to a method and apparatus for forming shaped foamed-glass articles. Glass particles are introduced to a pressure vessel in the presence of water. A pressure is applied to the pressure vessel sufficient to permit entrapment of water during sintering and sufficient to prevent foaming at processing temperatures. The temperature of the glass is increased to cause the glass to sinter and entrap water. The temperature of the glass is then increased to its fining temperature (T.sub.F) for a sufficient time to fine the glass. The temperature of the glass is reduced to its pressure release temperature (T.sub.PR). The pressure on the glass containing water is then reduced such as by extrusion to cause controlled foaming of the glass to occur. The glass is then cooled preferably by annealing to form the shaped foamed-glass article, typically pipe insulation.
REFERENCES:
patent: 2237037 (1941-04-01), Lytle
patent: 2310457 (1943-02-01), Owen
patent: 2322581 (1943-01-01), Lytle
patent: 3443920 (1969-05-01), Overcashier et al.
patent: 3870496 (1975-03-01), Cutler
patent: 4059425 (1977-11-01), Brydges, III et al.
Report No. EPA-600/3-77-030, Oakseson et al., issued Aug. 1977.
Macedo Pedro B.
Mohr Robert K.
Varshneya Deepak
Lindsay Robert
Litovitz Theodore A.
Macedo Pedro B.
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