Stain-resistant glass and method of making same

Details Stain-resistant glass and method of making same Stain-resistant glass and method of making same

C - Chemistry, Metallurgy

03

C

C03C 23/00 (2006.01) C03B 18/20 (2006.01)

Patent

CA 2163856

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.

L'invention concerne un verre résistant au ternissement et son procédé de production. D'après le procédé décrit par l'invention, on applique du SO3 sur la surface supérieure d'une plaque de verre flotté en une quantité suffisante pour limiter le ternissement du verre. Dans un mode de réalisation préféré, le gaz contenant de l'oxygène et le SO2 alimentent une arche de recuisson contiguë au bain de flottage à une température d'au moins 800 DEG F (environ 425 DEG C). Dans un aspect de l'invention, une hotte (30) comportant un système (40) de distribution de gaz définit une enceinte ouverte vers le bas et enfermant une partie du système de distribution. La hotte est, de préférence, située au-dessus d'un ruban de verre floté (25) dans une arche de recuisson (20) et le système de distribution peut comporter un tuyau de distribution servant à alimenter la hotte en gaz SO2 ou SO3.

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