| 摘要 |
1324477 Glass laminate CORNING GLASS WORKS 20 Aug 1971 [28 Aug 1970] 39127/71 Heading CIM A laminated article composed of a plurality of fused adjacent laminµ each comprising a glass or glass-ceramic, in which the outermost lamina is compressively stressed, the innermost lamina is tensilely stressed and each lamina exhibits a state of stress opposite to the laminµ adjacent thereto, is produced by melting a batch for each layer and simultaneously combining the melts to form a laminated structure at a temperature at which the viscosity of the innermost lamina is less than the viscosity of the outermost lamina within the range 1 : 1 to 1 : 6. The temperature for combining the melts is between 1200‹ and 1350‹ C. The ratio of the thickness of the innermost layer to the outermost layer is between 10 : 1 and 30 : 1 for a three-ply article. In an article consisting of more than three lamina the ratio of the total thickness of the tensilely stressed laminµ to the total thickness of the compressively stressed laminµ is between 5 : 1 and 50 : 1. Numerous examples of compositions of suitable glasses, spontaneous opal glasses, heat treatable opal glasses and glass-ceramics are given. The laminated sheet may be sagged into a mould such as a custard cup mould. Specifications 1,264,411 and 1,264,414 are referred to. |
