| 摘要 |
<p>Provided is a glass plate production method that makes the plate thickness of a sheet glass as uniform as possible and is capable of reducing warpage and strain. Said method is a glass plate production method using the downdraw method and comprises: a molding step in which molten glass is caused to flow down along both side surfaces of a molding body and the sheet glass is molded by causing the molten glass to merge in the lower section of the molding body; and a cooling step in which the sheet glass is cooled while being pulled downwards by a roller. A glass strain point upper temperature control step is performed in the cooling step, said step including: a first temperature control step, being a step in which temperature control is performed in the sheet glass width direction, in a temperature region from the bottom section of the molding body up to where the temperature is below that of a temperature region in the vicinity of the glass strain point, such that the end sections in the width direction of the sheet glass are made to have a lower temperature than the central region sandwiched by the end sections and the temperature in the central section becomes uniform; a second temperature control step in which the temperature in the width direction of the sheet glass reduces from the central section towards the end sections; and a third temperature control step in which the temperature gradient between the end sections and the central region in the width direction of the sheet glass in the temperature region in the vicinity of the glass strain point is eliminated.</p> |
