Glass melting method and method for manufacturing glass articles

Abstract

To provide a technique for manufacturing a high quality glass article having high homogeneity.SOLUTION: A glass melting method comprises melting a glass raw material in a glass melting furnace 1. The glass melting furnace 1 includes a first chamber 10; a second chamber 20; a barrier 5; and a plurality of bubblers 16 in the width of the glass melting furnace 1 in the bottom of the first chamber 10. A flow direction distance L1 between the upstream and downstream ends of the first chamber 10 is 0.5 L0-0.75 L0; a flow direction distance LF between the upstream end of the first chamber 10 and the row of the plurality of bubblers 16 is 0.65 L1-0.9 L1; and an upstream side circulation flow 100 of molten glass G formed on the upstream side from the plurality of bubblers 16 has -8 to 0 [m / h] of the average flow rate V1C of an upstream side surface flow 101 in the vicinity of the width direction center of the first chamber 10 at the flow direction distance of 0.8 LF-0.95 LF from the upstream end of the first chamber 10.SELECTED DRAWING: Figure 1

Claims

1. A glass melting method comprising melting the glass raw material in a glass melting furnace comprising: a first chamber into which glass raw material is introduced; a first chamber burner that forms a flame in the space above the first chamber; a second chamber into which molten glass obtained by melting the glass raw material is supplied from the first chamber; a second chamber burner that forms a flame in the space above the second chamber; and a barrier provided between the first chamber and the second chamber so as to separate the surface layer of the molten glass, wherein the glass raw material is melted in a glass melting furnace, The glass melting furnace has a plurality of bubbles extending in the width direction of the glass melting furnace at the bottom of the first chamber, The flow direction distance between the upstream end of the first chamber and the downstream end of the second chamber is L. ０ The flow direction distance L between the upstream and downstream ends of the first chamber is defined as follows: １ 0.5L ０ ~0.75L ０ The flow direction distance L between the upstream end of the first chamber and the row of the plurality of bubblers is such that Ｆ 0.65L １ ~0.9L １ And, The upstream circulation flow of the molten glass formed upstream of the plurality of bubblers has an upstream surface layer flow that moves in the upstream direction of the first chamber near the surface of the molten glass, and the flow direction distance from the upstream end of the first chamber is 0.8L Ｆ to 0.95L Ｆ At this time, the average flow velocity V of the upstream surface layer flow near the center in the width direction of the first chamber １Ｃ is not less than -8 [m / h] and less than 0 [m / h]. A glass melting method characterized by this

2. The glass melting method according to claim 1, wherein the vicinity of the center in the width direction of the first chamber is located at a position 0.4W to 0.6W inward in the width direction from the side edge of the first chamber, with W being the width direction distance of the glass melting furnace.

3. The downstream circulation flow of molten glass formed between the plurality of bubbles and the downstream end of the first chamber has a downstream surface flow that moves downstream of the first chamber near the surface of the molten glass, and the average flow velocity V of the downstream surface flow near the center of the width direction of the first chamber. ２Ｃ The glass melting method according to claim 1, wherein the value is greater than 0 [m / h] and less than or equal to +10 [m / h].

4. The glass melting method according to Claim 1, wherein the distance between the bottom wall of the glass melting furnace and the lower end of the barrier is 0.1H1 to 0.8H1, where H1 is the distance from the bottom wall to the surface layer of the molten glass.

5. A method for manufacturing a glass article, comprising: obtaining molten glass by melting a glass raw material using the melting method described in any one of claims 1 to 4; obtaining molded glass by shaping the molten glass; and slowly cooling the molded glass.

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