| 摘要 |
<p>DICLOSED IS A PLATE GLASS WHEREIN SURFACES (3A) OF PLATE GLASS (3) ARE FORMED FLAT AND FINISHED WITH A MAXIMUM SURFACE RUGGEDNESS NOT EXCEEDING 0.05 MM, AND BOUNDARIES (3C) BETWEEN END SURFACES (3A) AND FRONT AND BACK SURFACES (3B) OF THE PLATE GLASS (3) ARE FINISHED WITH A MAXIMUM SURFACE RUGGEDNESS NOT EXCEEDING 0.007 MM. THUS, THOUGH THE PLATE GLASS IS TREATED WITH HEAT REINFORCEMENT BY THE METHOD SIMPLER AND MORE CONVENIENT THAN THE PRIOR ART, THE PLATE GLASS MAINTAINS PERFORMANCE AS FIRE GLASS. IT IS NOW POSSIBLE TO PROVIDE QUALITY IMPROVEMENT AS PLATE GLASS, A REDUCTION IN RUNNING COST OF HEAT REINFORCING TREATMENT EQUIPMENT, AND A REDUCTION IN WORKING STRESS DUE TO THE WEIGHT OF THE PLATE GLASS ITSELF IN TIME OF FITTING THE PLATE GLASS.</p> |
