| 摘要 |
<p>The present invention provides a stain-resistant glass and a method of making such a glass. In accordance with the method of the invention, SO3 is applied to the upper surface of a sheet of float glass in an amount sufficient to reduce staining of the glass. In a preferred embodiment, the oxygen-containing gas and SO2 gas are supplied in a lehr adjacent the float bath at a temperature of at least about 800 °F (about 425 °C). In one aspect of the invention, a hood (30) having a gas delivery system (40) is provided, with the hood defining a downwardly open enclosure and enclosing a portion of the delivery system. The hood is optimally disposed above a ribbon of float glass (25) in an annealing lehr (20) and the delivery system may include a sparge pipe for delivering either SO2 or SO3 gas to the hood.</p> |
