| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To aim at the lowering of production cost and the reduction of facility cost by suitably positioning and temporarily retaining each glass plate in a low temperature state by a simple method and suitably performing a following high temperature heat treatment when producing a reinforced glass plate by laminating a plurality of glass plates. <P>SOLUTION: A thick core plate glass 2a having a higher thermal expansion coefficient and a thin surface-layer plate glass 3a having a lower thermal expansion coefficient are brought into surface-to-surface contact so that a bonding surface 2x and 3x of the core plate glass 2a and the surface-layer plate glass 3a attain a close contact state, thereby directly bonding the core plate glass and the surface-layer plate glass 2a and 3a; then, additionally performing heat treatment so that the surface-to-surface contact portion has a temperature equal to or higher than a lower strain point out of strain points of the core plate glass and the surface-layer plate glass; and then, performing cooling so as to attain a temperature lower than the lower strain point, to thereby form a compression stress in a surface layer portion 3 corresponding to the surface-layer plate glass 3a and form a tensile stress in a core portion 2 corresponding to the core plate glass 2a. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
