Apparatus for, and method of, roll forming sheets of high refractive index glass
US11629087B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 8, 2021 |
| Grant date | Apr 18, 2023 |
| Priority date | — |
| Expiry date | Nov 8, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C3/095
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of forming a glass sheet comprises: (a) forming a ribbon of glass from molten glass with a pair of forming rollers; (b) reducing horizontal temperature variability of the ribbon of glass to be 10° C. or less across 80 percent of an entire width of the ribbon of glass before the ribbon of glass cools to a glass transition temperature; (c) controlling a cooling rate of the ribbon of glass while the ribbon of glass moves vertically downward within a setting zone such that the ribbon of glass has a first average cooling rate before the ribbon of glass cools to the glass transition temperature and a second average cooling rate after the ribbon of glass cools to the glass transition temperature, the first average cooling rate being less than the second average cooling rate; and (d) separating a glass sheet from the ribbon of glass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.