The overflow downdraw method or fusion method is a technique for producing flat glass. The advantages of this technique as compared to the float glass process are the pristine surfaces, not touched by molten tin, and the low thickness of the sheet (0.7 mm and less) that can be achieved. The technique is used for the production of flat panel display glass by the companies Corning and Samsung Corning Precision Glass.
The fusion method was originally conceived by Corning in the 60's as a method for manufacturing automotive windshields. Shelved for years, the technology was reintroduced to supply the flat screen display market.
References
- US Patent 851627, June 15, 2004
- US Patent 6990834, January 31, 2006
- Huey-Jiuan Lin, Wei-Kuo Chang: Design of a sheet forming apparatus for overflow fusion process by numerical simulation; Journal of Non-Crystalline Solids, Volume 353, Issues 30-31, 1 October 2007, Pages 2817-2825 Full text article
- description of the fusion overflow process at the Corning website
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