Glass manufacturing – Processes – Utilizing parting or lubricating layer
Patent
1997-06-24
1999-02-23
Silverman, Stanley S.
Glass manufacturing
Processes
Utilizing parting or lubricating layer
65102, 65120, 65122, 65124, 651822, 6537415, C03B 4004
Patent
active
058739211
ABSTRACT:
Processes for manufacturing glass optical elements by press molding a heated and softened glass material in preheated molds. In the process, the glass material is heated while it is floated by a gas blow and the heated and softened glass material is transferred to the preheated molds and then subjected to press molding. Alternatively, the process comprises: heating a glass material at a temperature at which the glass material has a viscosity of lower than 10.sup.9 poises, preheating molds at a temperature at which the glass material has a viscosity of from 10.sup.9 to 10.sup.12 poises, subjecting the heated and softened glass material to initial press in the preheated molds for 3 to 60 seconds, starting to cool the vicinity of molding surfaces of the molds at a rate of 20.degree. C./minute or higher upon starting of, or during, or after the initial press, and removing a molded glass article from the molds after the temperature of the vicinity of the molding surfaces of the molds becomes a temperature equal to or lower than a temperature at which the glass material has a viscosity of 10.sup.12 poises.
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Enomoto Hiroshi
Fujimoto Tadayuki
Hirota Shin-ichiro
Takahara Hiroaki
Uno Ken
Hoya Corporation
Hoya Precisions Inc.
Silverman Stanley S.
Vincent Sean
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