Process for producing glass and glass-melting apparatus thereof
AssigneeHoya Corporation
InventorsKazuo Ogino, Jun Ichinose, Yasuko Katoh, Rieko Kudo
Life of this patent
Estimating the term…
Abstract
A process for producing a high-quality glass from highly reactive raw materials and a glass-melting apparatus for use therewith, comprising the step of charging a material for the glass to a molten glass in a heated vessel, (1) wherein an oxidizing gas is bubbled in the molten glass and a glass raw material that behaves as a reducing agent during being melted is charged into a position of the bubbling or (2) said vessel is filled with a dry ambient gas and while the ambient gas is allowed to flow to a liquid surface of the molten glass along an charging route of the glass raw material, the glass raw material is charged.
Claims11
A process for producing a glass, which comprises the step of charging a glass raw material into a molten glass in a heated vessel to melt the glass raw material, wherein an oxidizing gas is bubbled in the molten glass and a glass raw material that behaves as a reducing agent during being melted is charged into a position of the bubbling and wherein the glass raw material charging rate and/or a molten glass withdrawal rate are controlled so that the depth of the molten glass in a position where the glass raw material is charged is adjusted to be 1.5 to 3 times as large as a distance between a glass raw material charging port and a liquid surface of the molten glass.
A process for producing a glass, which comprises the step of charging a glass raw material into a molten glass in a heated vessel to melt the glass raw material, wherein said vessel is filled with a dry ambient gas and while the ambient gas is allowed to flow to a liquid surface of the molten glass along a charging route of the glass raw material, the glass raw material is charged.
A process for producing a fluorophosphate glass, which comprises the step of charging a glass raw material into a molten glass in a heated vessel to melt the glass raw material, wherein an oxidizing gas is bubbled in the molten glass and the glass raw material for the fluorophosphate glass is charged into a position of the bubbling, and wherein free phosphorus generated by the decomposition of the glass raw material is oxidized with bubbles of the oxidizing gas.
Dependencies are inferred from the claim text.