Glass sheet comprising an enameled zone and an underlayer
A material includes a glass sheet, one face of which includes an enameled zone coated with an opaque enamel layer and a nonenameled zone, an underlayer which is not an enamel layer being positioned solely in at least a part of the enameled zone, under the enamel layer and in contact therewith.
1. A material comprising a glass sheet, one face of which comprises an enameled zone coated with an opaque enamel layer and a nonenameled zone, an underlayer which is not an enamel layer being positioned solely in at least a part of the enameled zone, under said enamel layer and in contact therewith.
2. The material as claimed in claim 1 , wherein the enameled zone represents between 2% and 25% of a surface area of the coated face.
3. The material as claimed in claim 2 wherein the enameled zone is provided in the form of a peripheral strip.
4. The material as claimed in claim 1 , wherein the nonenameled zone is uncoated.
5. The material as claimed in claim 1 , wherein the underlayer is in contact with the glass sheet.
6. The material as claimed in claim 1 , wherein the underlayer is positioned in the whole of the enameled zone.
7. The material as claimed in claim 1 , wherein the underlayer is based on an oxide, a nitride or an oxynitride.
8. The material as claimed in claim 7 , wherein the underlayer is based on silicon oxide.
9. The material as claimed in claim 1 , wherein the underlayer is devoid of coloration.
10. The material as claimed in claim 1 , wherein the underlayer is a single layer.
11. The material as claimed in claim 1 , wherein the underlayer is a sol-gel layer.
12. The material as claimed in claim 11 , wherein the sol-gel layer is based on, or is constituted of, silicon oxide.
13. The material as claimed in claim 1 , wherein the thickness of the underlayer is between 10 nm and 1 μm.
14. A process for obtaining a material as claimed in claim 1 , comprising depositing an underlayer on a part of a face of a glass sheet and then depositing an opaque enamel layer in at least the zone coated with the underlayer.
15. The process as claimed in claim 14 , wherein the deposition of the underlayer is carried out by a sol-gel process, by cathode sputtering or by chemical vapor deposition.
16. A glazing comprising a material as claimed in claim 1 .
17. The glazing as claimed in claim 16 , wherein the glazing is a back window, a roof or a windshield of a motor vehicle.