| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a glass substrate, which can improve quality of glass articles by eliminating causes of striae and devitrification.SOLUTION: In a method for manufacturing a glass substrate including a defoaming step, a transfer pipe 40 for sending molten glass from a clarifying vessel 30 to a next step is connected to an exit side from which molten glass is flowed out from the clarifying vessel 30. In addition, the method includes a liquid level adjusting step of adjusting a flow rate of the molten glass so that the molten glass is at a predetermined liquid level when the molten glass containing a clarifying agent is passed through the clarifying vessel 30. Further, the transfer pipe 40 is provided to such a position that the molten glass in the vicinity of its upper surface of the molten glass flowing in the clarifying vessel 30 is flowed into the transfer pipe 40 without stagnation in the vicinity of the exit when the molten glass at a predetermined liquid level is passed. |
