Glass making method
AssigneeSaint-Gobain Emballage
InventorsSylvie Abensour, Bertrand Maquin
Life of this patent
Estimating the term…
Abstract
The subject of the invention is a process for manufacturing red glass containing copper that comprises the steps consisting in: obtaining a mass of colorless molten glass, free of sulfides, the iron oxide weight content of which is between 0.01 and 0.15%; then conveying said mass of molten glass in a feeder channel, in which copper oxide and tin oxide are added to said mass of molten glass, the partial pressure of oxygen in said mass of molten glass being between 10−7 and 10−4; then forming glass objects, especially bottles or flasks from said mass of molten glass; then subjecting said glass objects to a heat treatment so as to develop a red tint.
Claims16
A process for manufacturing red glass comprising copper, the process comprising:
- (1) obtaining within a glass melting furnace a mass of colorless molten glass formed by melting at least one batch material comprising sand, wherein
- said mass is free of sulfides,
- a weight content of iron oxide in said mass is between 0.01 and 0.15%, and
- a ratio of the weight of sulfate (in SO3 form) of said mass to the weight of sand is between 0.3 and 0.6%;
- (2) conveying said mass of colorless molten glass, having a partial pressure of oxygen of between 10−7 and 10−4, in a feeder channel;
- then
- (3) adding within the feeder channel copper oxide and tin oxide to said mass of colorless molten glass to form a copper-containing molten glass, such that a partial pressure of oxygen in said mass of colorless molten glass within the feeder channel is between 10−7 and 10−4;
- (4) forming a glass object from said copper-containing molten glass;
- then
- (5) heat treating said glass object to develop a red tint and to form a red glass object.
Dependencies are inferred from the claim text.