| 摘要 |
PURPOSE:To manufacture tempered glass having low see-through distortion and high strength, by quenching the hot surface of a plate glass with quenching air blown through nozzles, wherein at least a part of the circumferential part of the plate glass is cooled uniformly compared with the central part thereof. CONSTITUTION:A plate glass 5 is heated near its softening point, suspended with the clamp 6, and inserted between the oppositely placed nozzle groups 4. The surface of the glass is quenched by blasting air through the nozzles 4 while vertically oscillating the air supplying members 1, 1. Since the gap ND between the surfaces at the top 5a and the bottom 5b of the plate glass and the nozzles 4 is broader than the gap ND between the central part 5c of the plate glass and the nozzles 4b, the edge parts 5a, 5b of the plate glass is cooled more uniformly than the other part, and the possibility of the quenching crack caused by the tension exerting at the circumferential part of the plate glass 5 during quenching can be decreased. |
