| 摘要 |
PURPOSE:To easily obtain the title long and large-sized plate crystal glass having strength, by press-molding the powdery mixture of glass materials in the softening zone of the low-softening point glass with the belts carrying the mixture in between and rolls, and then heat-treating and crystallizing the compact. CONSTITUTION:The powder of glass materials having different softening points is heated to a specified temp. while being held between a couple of conveying belts, hence only the low-softening point glass is softened, and the high-softening point glass is not softened. The half-softened glass material is passed between two rolls along with the belts, and press-molded. The obtained plate compact is heat-treated, and the glass material powder constituting the compact is softened, fused together, densified, and crystallized.
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