Glass manufacturing – Processes – Utilizing parting or lubricating layer
Patent
1980-11-21
1982-04-13
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Utilizing parting or lubricating layer
65 311, 65 301, 65134, 252317, 501 12, 501 54, 501 63, C03C 304, C03C 306
Patent
active
043245765
ABSTRACT:
A method for producing optical glass, which comprises charging a mixed solution capable of forming a high-silica-content gel by hydrolysis reaction into a vessel, the inner wall face of which is composed of a material unwettable to the mixed solution, such as a fluorocarbon resin or silicone resin, causing gelation of the mixed solution in the vessel, drying the obtained gel, and heating and sintering the obtained dry gel. When electrodes are placed in the mixed solution at the gelation step and an electric voltage is applied, the time required for formation of the gel is shortened. Furthermore, at the gel-drying step, if the amount of materials evaporated from the gel is detected or the weight of the gel is measured, the detected amount of the evaporated materials or the change of the weight of the gel is fed back to a factor regulating the drying speed, such as the drying temperature to control the drying speed to an appropriate level.
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Matsuyama Iwao
Satoh Shin
Suganuma Tsuneo
Susa Kenzo
Hitachi , Ltd.
Lindsay, Jr. Robert L.
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