TWI757380B - Plate glass manufacturing method, clarification container, and plate glass manufacturing apparatus - Google Patents

Abstract

The plate glass manufacturing method comprises: a melting process, a clarification process, and a forming process. In the plate glass manufacturing method, the refining process is performed while bringing the molten glass (GM) into contact with the entire inner surface of the main body (7) so that the gas phase space is not formed in the refining vessel (2).

Description

Plate glass manufacturing method, clarification vessel, and plate glass manufacturing apparatus

The present invention is about the method for manufacturing plate glass, the clarification container used for the method, and the plate glass manufacturing apparatus containing this clarification container.

[0002] As is well known, plate glass is used in flat-panel displays such as liquid crystal displays and organic EL displays. In recent years, due to the appearance of smartphones and tablet terminals, flat panel displays have been made thinner and lighter, and higher-definition has progressed. Along with this, sheet glass has also been reduced in thickness. As the material of the glass substrate, it is appropriate to use alkali-free glass with less deformation or gravity bending and excellent dimensional stability under high temperature process. [0003] Plate glass is formed into a thin plate through various processes such as a melting process, a clarification process, a homogenization process, and a forming process. For example, Patent Document 1 discloses a method for producing plate glass including a refining process for performing defoaming treatment in a refining vessel made of platinum or platinum alloy, in which a gas phase space is formed. While passing the molten glass in the state, the molten glass is heated to release air bubbles from the molten glass into the gas phase space. And in the upper part of a clarification container, the ventilation part (vent pipe) for communicating with the gaseous-phase space in a clarification container and for discharging the gas of the gaseous-phase space to the outside is provided. [Prior Art Document] [Patent Document] [0004] [Patent Document 1] Japanese Patent Laid-Open No. 2014-028734

[Problems to be Solved by the Invention] [0005] In the conventional sheet glass manufacturing method, the gas phase space in the clarification container becomes high temperature, and there is a problem that volatilization loss is easily formed on the inner surface of the clarification container. Moreover, when the gas in a clarification container is discharged|emitted from a ventilation part, the platinum volatile component contained in a gas is cooled, solidified and mixed in a molten glass, and there exists a possibility that the quality of a plate glass may fall. [0006] The present invention was developed in view of the above-mentioned shortcomings, and it is a technical problem to perform the defoaming treatment of molten glass well and to manufacture high-quality plate glass. [Means for Solving the Problems] [0007] The present invention has been developed to solve the above-mentioned problems, and is a method for producing plate glass, comprising: a melting process for melting glass raw materials in a melting tank to generate molten glass; A clarification process in which the molten glass is passed through a clarification vessel made of platinum or a platinum alloy for degassing, and a molding process in which the molten glass after the clarification process is formed into a plate glass in a forming tank, The glass manufacturing method is characterized in that: the clarification container is provided with: a hollow main body portion for transferring the molten glass from upstream to downstream, and a plurality of partition plates arranged at intervals in the main body portion; The main body part is provided with a ventilation part provided on the upper part and which discharges the gas generated in the molten glass; an opening, and a second opening provided below the first opening and allowing the molten glass to pass therethrough; the molten glass is brought into contact with the The inner surface of the main body is completely covered, and the above-mentioned clarification process is performed at the same time. [0008] According to this method, when the refining process is performed, the inner space of the main body in the refining vessel is completely filled with molten glass, so that the gas phase space is not formed between the inner surface of the main body and the molten glass. In addition, the partition plate provided in the main body portion can guide the air bubbles formed by the gas generated in the molten glass to the ventilation portion through the first opening portion. Thereby, platinum can be prevented from volatilizing from the inner surface of the main body in the high-temperature gas phase space as in the past. Therefore, mixing of platinum into molten glass can be prevented, and the defoaming process of molten glass can be performed favorably, and high-quality plate glass can be produced. In the above-mentioned situation, the liquid level of the above-mentioned molten glass in the above-mentioned melting tank is set at a position higher than the top of the inner surface in the above-mentioned main body part, so that the above-mentioned molten glass is in contact with the above-mentioned main body part. All the inner surfaces are better. Thereby, until the molten glass reaches the top of the inner surface in the main body, the refining process can be performed without forming a gas-phase space between the inner surface of the main body and the molten glass. The present invention is in order to solve above-mentioned problem and research and create, is a kind of clarification vessel, is equipped with: molten glass is carried out from upstream to downstream to carry out the hollow main body part and be arranged in above-mentioned main body part at intervals A plurality of partition plates, and the clarification container formed by platinum or platinum alloy is characterized in that: the above-mentioned main body part is equipped with a ventilation part that discharges the gas generated in the above-mentioned molten glass on its upper part; The partition plate is provided with a first opening provided on the upper portion thereof and through which the air bubbles formed by the gas pass, and a second opening provided at a position below the first opening and through which the molten glass passes. . [0011] When performing the refining process, it is necessary to guide the air bubbles generated in the molten glass to the vent. In the present invention, the clarification vessel can reliably guide the air bubbles to the ventilation part by passing the air bubbles through the first opening formed in the upper part of the partition plate, so that the defoaming process of the molten glass can be favorably performed. . [0012] In the clarification vessel of the above-mentioned constitution, the distance from the above-mentioned ventilating portion is more than 10mm, preferably less than 300mm, on the upstream side of the above-mentioned ventilating portion and is positioned on the above-mentioned partition plate immediately adjacent to the above-mentioned ventilating portion. Moreover, the distance between the said partition plate and the said ventilation part is preferably 10 mm or more and 300 mm or less on the downstream side of the ventilation part and is located immediately adjacent to the ventilation part. As described above, by separating the vent portion and the partition plate by an appropriate distance, the air bubbles in the molten glass can be very appropriately guided to the vent portion. In the clarification vessel of above-mentioned constitution, the above-mentioned first opening of above-mentioned partition plate, is to be more offset to one side of above-mentioned width direction than the central part in the width direction of above-mentioned partition plate and become better . In addition, the plurality of partition plates include: a first partition plate having a first opening that is offset from a center portion in the width direction toward one side in the width direction, and a second partition plate, which It is preferable to have a 1st opening part offset toward the other side of the said width direction from the center part of the width direction. [0014] The plurality of partition plates are preferably located on the upstream side of the ventilation portion. Moreover, it is preferable that the said 1st opening part is formed in all the said some partition plates. [0015] Also, in the clarification container of the present invention, the above-mentioned first opening may also be a concave portion formed on the top of the above-mentioned plural partition plates. [0016] The clarification container of the present invention may also be further equipped with a partition plate that is arranged on the downstream side of the plurality of partition plates and does not form the first opening. By arranging the partition plate without the first opening on the most downstream side in this way, when the molten glass is transferred from the clarification vessel to the next process, it is possible to prevent the bubbles generated in the molten glass from being moved together with the molten glass. Load to the next process. The present invention is to be developed in order to solve the above-mentioned problems, and is a kind of plate glass manufacturing apparatus, which is equipped with: a melting tank for melting glass raw materials and generating molten glass, and the above-mentioned clarification vessel, and forming the above-mentioned molten glass into The plate glass forming tank, the plate glass manufacturing apparatus, is characterized in that the liquid level of the molten glass in the melting tank is set higher than the top of the inner surface of the main body. [0018] According to this configuration, when the clarification process is performed, the entire interior space of the body portion of the clarification vessel can be filled with molten glass. Thereby, a gas phase space is not formed between the inner surface of the main body portion and the molten glass. Therefore, platinum does not volatilize on the inner surface of the main body due to the high temperature gas phase space as in the past. Thereby, the situation in which the volatilized platinum is prevented from being mixed into the molten glass, the defoaming process of the molten glass can be performed favorably, and a high-quality plate glass can be produced. [Effects of the Invention] [0019] According to the present invention, the defoaming treatment of the molten glass can be favorably performed, and high-quality plate glass can be produced.

[0021] Hereinafter, the embodiments for implementing the present invention will be described with reference to the drawings. FIGS. 1 to 10 show one embodiment of a plate glass manufacturing apparatus and a plate glass manufacturing method according to the present invention. As shown in Fig. 1, in the plate glass manufacturing apparatus of the present embodiment, in order from the upstream side, it is equipped with: a melting tank 1, a clarification vessel 2, a homogenization tank (stirring tank) 3, a state adjustment tank 4 , the forming tank 5, and the glass supply flow paths 6a-6d connecting the tanks 1-5. In addition, the plate glass manufacturing apparatus may be provided with a slow cooling furnace (not shown) for slowly cooling the plate glass GR formed in the forming tank 5, and a cutting device for cutting the plate glass GR after the slow cooling. (illustration omitted). [0023] The melting tank 1 is a container for carrying out a melting process, and the melting process is a process for melting the input glass raw material to obtain molten glass GM. The melting tank 1 is connected to the clarification vessel 2 via the glass supply flow path 6a. The clarification container 2 is a container for performing a clarification process, which is a process of defoaming the molten glass GM supplied from the melting tank 1 by the action of a clarifier or the like. The clarification container 2 is connected to the homogenization tank 3 via the glass supply flow path 6b. Homogenization tank 3 is a container for carrying out a homogenization process, and this homogenization process is a process in which the molten glass GM after clarification is stirred by stirring wings etc. to make it homogenized. The homogenization tank 3 is connected to the state adjustment tank 4 via the glass supply flow path 6c. The state adjustment tank 4 is a container for performing the state adjustment process which adjusts molten glass GM to the state suitable for shaping|molding. The state adjustment tank 4 is connected to the molding tank 5 via the glass supply flow path 6d. [0025] The forming tank 5 is a container for forming the molten glass GM into a desired shape. In the present embodiment, the forming tank 5 forms the molten glass GM into a plate shape by an overflow downdraw method. More specifically, the cross-sectional shape of the forming groove 5 (the cross-sectional shape perpendicular to the plane of the drawing in FIG. 1 ) is substantially wedge-shaped, and an overflow groove (not shown) is formed in the upper portion of the forming groove 5 . . In the forming tank 5, after the molten glass GM is supplied to the overflow groove through the glass supply flow path 6d, the molten glass GM overflows from the overflow groove, and then follows the side wall surfaces ( The side located on the back side of the paper) flows down. The forming tank 5 is formed into a plate shape by merging the molten glass GM after flowing down at the lower top of the side wall surface. [0027] The formed plate glass GR has a thickness of, for example, 0.01 to 10 mm, and is used as a substrate or a protective cover for flat-panel displays such as liquid crystal displays, organic EL displays, organic EL lighting, and solar cells. Moreover, the shaping|molding groove 5 may be implemented by the other draw-down method, such as a slot down-draw method. Below, for the concrete constitution of clarification container 2, while referring to the 2nd figure to the 10th figure, it will be described. The clarification vessel 2 includes: a hollow body portion 7 that transports molten glass GM from upstream to downstream, a plurality of partition plates 8 arranged at intervals in the body portion 7 , and a heating portion that heats the body portion 7 9. Any one of the main body portion 7 , the partition plate 8 , and the heating portion 9 is made of platinum or platinum alloy in a predetermined shape. [0029] Although the main body portion 7 is formed in a cylindrical shape having a predetermined length, it is not limited to this shape, as long as it is a hollow shape and has a space in which the molten glass GM flows. A glass supply flow path 6 a connecting the melting tank 1 to the main body 7 is connected to one end (upstream end) in the longitudinal direction of the main body 7 . The other end part (downstream side end part) in the longitudinal direction of the main body part 7 is connected with the glass supply flow path 6b which connects the homogenization tank 3 and the main body part 7. [0030] The main body portion 7 is provided with a vent portion 7a (vent pipe) for discharging the gas generated in the molten glass GM. The ventilation part 7a is provided so as to protrude upward from the upper part of the main body part 7 . The ventilation portion 7 a is formed in a cylindrical shape (eg, cylindrical shape), is fixed to the upper outer surface of the main body portion 7 , and communicates with the inside of the main body portion 7 . The ventilation part 7a is made of platinum or platinum alloy like the main body part 7 . [0031] The body portion 7 has a plurality of cylindrical bodies 7b. The main body portion 7 is formed by connecting the cylindrical body 7b and the partition plate 8 alternately. Although the cylindrical body 7b is comprised in a cylindrical shape, it is not limited to this shape. The ventilation portion 7a may be integrally formed with one of the plurality of cylindrical bodies 7b. [0032] Although the partition plate 8 is formed in a disc shape, it can be formed in an appropriate shape corresponding to the shape of the main body portion 7 without being limited by this shape. A part of the surface of the partition plate 8 is the end face of the cylindrical body 7b fixed to the main body 7 . The diameter of the partition plate 8 is set to be the same as the outer diameter of the cylindrical body 7b in the main body portion 7 . Below, among the plurality of partition plates 8, on the upstream side of the ventilation portion 7a, and be the partition plate (hereinafter referred to as "the first partition plate") 8a adjacent to the ventilation portion 7a, and On the downstream side of the ventilation part 7a, the partition plate (hereinafter referred to as "second partition plate") 8b immediately adjacent to the ventilation part 7a is an example, and will be described with reference to FIGS. 3 to 6 . Also, in the following description, the vertical line passing through the center portion O of each partition plate 8 is called "the first center line" (represented by symbol Y1), and the line passing through the center portion O of the partition plate 8 will be referred to as "the first center line" (represented by symbol Y1). The horizontal line is called the "second center line" (indicated by the symbol X1). In addition, the direction along the first center line Y1 is referred to as the "up-down direction" (indicated by the symbol Y), and the direction along the second center line X1 is referred to as the "width direction" (indicated by the symbol X). In addition, in each partition plate 8, the portion on the upper side of the first center line Y1 is referred to as the “upper portion” of the partition plate 8, and the portion on the lower side than the first center line Y1 is referred to as the region. The "lower part" of the separator 8 . [0035] In the longitudinal direction of the main body portion 7, the distance D1 between the first partition plate 8a and the ventilation portion 7a is set to more than 10mm and preferably less than 300mm. In addition, the distance D2 between the second partition plate 8b and the ventilation portion 7a is preferably set to 10 mm or more and 300 mm or less. The 1st partition plate 8a and the 2nd partition plate 8b are provided with the 1st opening part 10 which is provided in the upper part, and through which the bubble B formed by the gas generated in the molten glass GM passes, and It is provided in the lower position of the 1st opening part 10, and the 2nd opening part 11 through which molten glass GM passes. As shown in FIGS. 3 to 6 , the first opening portion 10 is a through hole formed on the inner side of the peripheral edge portion of the partition plate 8 . The first opening 10 is formed above the second opening 11 . The opening area of the second opening 11 is set to be larger than the opening area of the first opening 10 . [0037] The first opening 10 is mainly used for the circulation of the bubbles B formed by the gas generated in the molten glass GM. On the other hand, the 2nd opening part 11 is used mainly for the flow of molten glass GM. Although the first openings 10 of the first partition plate 8a and the second partition plate 8b, as shown in FIG. 4, constitute a fan-shaped shape with a center angle of about 90 degrees, they are not limited by this shape. . As shown in FIGS. 4 and 5, the first opening 10 of the first partition plate 8a is offset on one side in the width direction X with respect to the center portion O of the first partition plate 8a. That is, the first opening portion 10 of the first partition plate 8a, as shown in FIG. 5, is formed on a side offset in the width direction X with respect to the first center line Y1 (to the side of the width direction X). It is the position on the right side in the paper of Fig. 5). In addition, the first opening 10 of the second partition plate 8b is offset on the other side in the width direction X with respect to the center portion O of the second partition plate 8b. That is, as shown in FIG. 6, the first opening 10 of the second partition plate 8b is formed on the other side in the width direction X with respect to the first center line Y1 (with respect to the sixth The position on the left side of the drawing. In other words, the first opening 10 of the second partition plate 8b is offset in the width direction X on the opposite side to the first opening 10 of the first partition plate 8a. [0040] The second opening 11 of the first partition plate 8a is formed into an ellipse when viewed from the front. The center portion of the second opening portion 11 coincides with the center portion O of the first partition plate 8a. The second opening 11 of the second partition plate is formed at the lower portion of the second partition plate 8b. The second opening 11 is formed in a semicircular shape when viewed from the front. Specifically, the second opening portion 11 of the second partition plate 8b is formed in the second partition plate 8b in such a manner that the straight portion is above and the arc portion is lower than the straight portion. The center portion of the second opening portion 11 is positioned further downward than the center portion O of the second partition plate 8b. Therefore, the second opening 11 of the first partition plate 8a and the second opening 11 of the second partition plate 8b are in a state where the position in the vertical direction Y is deviated in front view. In this way, by making the formation positions of the second openings 11 different for the respective partition plates 8 ( 8 a, 8 b ), the molten glass GM flowing in the main body 7 is made meandering, so that a good defoaming process can be performed. . The heating portion 9, as shown in FIG. 2, includes a flange portion 12 formed to surround the peripheral edge of the end portion of the body portion 7, and an electrode portion 13 formed on the upper portion of the flange portion 12. . The flange portion 12 and the electrode portion 13 are made of platinum or platinum alloy like the body portion 7 . The heating part 9 directly heats the main body part 7 by applying a predetermined voltage to the electrode part 13 . Thereby, the clarification container 2 can maintain the molten glass GM which flows in the main body part 7 at a predetermined temperature in a clarification process. As shown in FIG. 7, the liquid level GS of the molten glass GM in the melting tank 1 is set at a position higher than the top (apex) 7c of the inner surface of the main body 7, or is set at a position similar to the Same position on top 7c. Although this height difference H is set to 0 mm or more and 200 mm or less, it is not limited to this range. By this setting, all the internal space of the main body part 7 is filled with the molten glass GM which flowed in from the melting tank 1. That is, in the inside of the main body part 7, the upper inner surface of the main body part 7 is not separated from the molten glass GM, but all the inner surfaces are in contact with the molten glass GM (refer to FIG. 3). In this way, since the molten glass GM is in contact with the entire inner surface of the main body part 7 , the gaseous phase space is not formed in the main body part 7 . [0043] Among the partition plates 8 arranged in the main body portion 7, the first openings 10 are not formed in the partition plate 8c (refer to FIG. 2) arranged on the most downstream side. By this partition plate 8, the bubble B which generate|occur|produced in molten glass GM can be prevented from being conveyed to the downstream side of the clarification container 2. [0044] FIGS. 8 to 10 are other examples of the display area partition plate 8. In these examples, the configuration of the first opening 10 is different from the examples shown in FIGS. 5 and 6 . In the example shown in FIG. 8 , as the first opening 10 of the partition plate 8 , a concave portion formed by notching the upper end of the partition plate 8 is formed. The concave portion is formed so as to be recessed from the upper edge portion of the partition plate 8 toward the center portion O of the partition plate 8 . In this example, it is preferable to constitute the main body portion 7 by contacting the peripheral portion of the partition plate 8 with the inner surface of the cylindrical body 7b in the main body portion 7 . That is, the outer diameter of the partition plate 8 is set to be the same as the inner diameter of the cylindrical body 7b. [0045] In the example shown in FIG. 9, a plurality of (two) first openings 10 are formed in the partition plate 8. Specifically, a pair of first openings 10 are formed to sandwich the first center line Y1 of the partition plate 8 therebetween. Each of the first openings 10 is offset in the width direction X with respect to the first center line Y1 of the partition plate 8 . Moreover, a pair of 1st opening part 10 is provided so that it may become line-symmetrical with respect to 1st center line Y1. [0046] In the example shown in FIG. 10, the first opening 10 is formed in a semicircle. Specifically, the linear portion of the first opening portion 10 is formed at the lower position, and the circular arc portion is formed at the upper position in the partition plate 8 . In addition, the center portion of the first opening portion 10 is offset in the width direction X with respect to the center portion O of the partition plate 8 . That is, the first opening portion 10 is located on one side (right side) in the width direction X of the first opening portion 10 with respect to the vertical line (center line) Y2 passing through the center portion than the first center line Y1 of the partition plate 8 . Therefore, the first opening 10 is asymmetric with respect to the first center line Y1 of the partition plate 8 (has no line symmetry with respect to the first center line Y1). [0047] Hereinafter, a method for manufacturing plate glass GR using the plate glass manufacturing apparatus having the above-described configuration will be described. In this method, the raw material glass is melted in the melting tank 1 (melting process) to obtain molten glass GM. A clarifying agent is prepared in the glass raw material, and gas (bubble) is generated by the action of the clarifying agent in the molten glass GM. As a _clarifying agent, _As2O3 , _Sb2O3 , _SnO2 , _Fe2O3 , _SO3 , _F , _Cl etc. can be used. However, since As ₂ O ₃ and Sb ₂ O ₃ are environmentally hazardous substances, their use should be extremely avoided, and SnO ₂ is best used as a clarifying agent. In the clarification process, be the molten glass GM supplied from the melting tank 1 via the glass supply flow path 6a, from one end (upstream) of the body part 7 in the clarification vessel 2 to the other end (downstream) move. The main body part 7 is heated by the heating part 9, and maintains the temperature of the molten glass GM which flows at 1300-1500 degreeC. In this clarification process, the bubbles B originating from the gas generated by the redox action of the clarifier are floated (refer to FIG. 3). The bubbles B pass through the first openings 10 of the partition plates 8 together with the molten glass GM, and are released from the liquid surface of the molten glass GM facing the vent portion 7a as a gas. The gas is finally discharged from the vent portion 7a to the outside of the main body portion 7 . In addition, the air bubbles B that have passed through the vent portion 7a may flow back through the first opening portion 10 of the partition plate 8 (second partition plate 8b) located on the downstream side of the vent portion 7a, and then flow out of the air bubble as a gas. The ventilation portion 7a is discharged. Then, the molten glass GM after the clarification (defoaming treatment) has been carried out is transferred to molding through the homogenization process performed by the homogenization tank 3 and the state adjustment process performed by the state adjustment tank 4. Slot 5. In the molding process, the molten glass GM is molded into the plate glass GR by the molding tank 5 (refer to FIG. 1). Then, the plate glass GR is formed into a predetermined size through a slow cooling process by a slow cooling furnace and a cutting process by a cutting device. Alternatively, the plate glass GR is wound into a roll shape without being cut after the slow cooling process. [0050] According to the plate glass manufacturing method of the present embodiment described above, when the clarification process is performed, the molten glass GM is filled with all the internal space of the body portion 7 of the clarification vessel 2. That is, molten glass GM flows from upstream to downstream in the main body part 7 while contacting the whole (full surface) of the inner surface of the main body part 7 . Therefore, a gas-phase space is not formed between the inner surface of the main body part 7 and the molten glass GM. [0051] Therefore, in the inner surface of the main body portion 7, platinum does not volatilize due to the high temperature gas phase space as in the past. Thereby, it is possible to prevent a situation in which the volatilized platinum is mixed into the molten glass GM as in the past. Moreover, since the partition plate 8 provided in the main body part 7 has the 1st opening part 10 which passes the bubble B which generate|occur|produces in the molten glass GM, the gas (bubble B) in the molten glass GM can pass through this 1st opening part 10. The opening portion 10 is reliably discharged from the ventilation portion 7a. [0052] In addition, the present invention is not limited by the configuration of the above-mentioned embodiment, nor is it limited by the above-mentioned functions and effects. In the present invention, various modifications can be made without departing from the gist of the present invention. In the above-mentioned embodiment, although it is shown that the first opening 10 of the partition plate 8 is offset more toward the width direction than the center portion O of the partition plate 8, it is not limited by this. limited. The center portion of the first opening portion 10 may also be configured to coincide with the center portion O of the partition plate 8 in the width direction X. As shown in FIG. [0054] In the above-described embodiment, the example in which the plurality of partition plates 8 are arranged on the upstream side and the downstream side of the ventilation portion 7a is shown, but the present invention is not limited thereto. In the present invention, for example, the plurality of partition plates 8 may be arranged only on the upstream side of the ventilation portion 7a. In this case, only the partition plate 8 which does not have the 1st opening part 10 may be arrange|positioned on the downstream side of the ventilation part 7a as the structure. [0055] In the above-mentioned embodiment, although it is illustrated that the body portion 7 is equipped with a clarification container 2 of the ventilation portion 7a, it is not limited to this configuration. The main body portion 7 may be provided with a plurality of ventilation portions 7a at intervals in the longitudinal direction thereof. In this case, the plurality of partition plates 8 may be arranged on the upstream side of the vent portion 7a located on the most downstream side. In addition, the partition plate 8 having the first opening 10 and the second opening 11 may be arranged on the downstream side of the vent portion 7a on the most downstream side, or the partition plate 8 not having the first opening 10 (having only the first opening 10) may be arranged. The partition plate 8 of the second opening 11). [0056] In the above-described embodiment, the plate glass manufacturing apparatus having one melting tank 1 is illustrated, but the present invention is not limited to this configuration. The plate glass manufacturing apparatus may be equipped with the some melting tank 1.

[0057] 1‧‧‧melting tank 2‧‧‧clarification vessel 3‧‧‧homogenizing tank (stirring tank) 4‧‧‧state adjusting tank 5‧‧‧forming tank 6a～6d‧‧‧glass supply flow path 7 ‧‧‧Main body part 7a‧‧‧Venting part 7b‧‧‧cylindrical body 8‧‧‧Partition plate 8a‧‧‧First partition plate 8b‧‧‧Second partition plate 9‧‧‧Heating part 10 ‧‧‧First opening part 11‧‧‧Second opening part 12‧‧‧Flange part 13‧‧‧electrode part D1‧‧‧distance D2‧‧‧second Distance between partition plate 8b and ventilation part 7a GM‧‧‧Melted glass GR‧‧‧plate glass GS‧‧‧liquid level H‧‧‧elevation O‧‧‧central part X‧‧‧width direction X1‧‧‧ The second center line Y‧‧‧ up and down direction Y1‧‧‧ the first center line

Fig. 1 is a side view showing the overall configuration of a plate glass manufacturing apparatus. Figure 2 is a side view of the clarification container. Figure 3 is a partial cross-sectional view of the clarification container. Figure 4 is a cross-sectional view taken along the line IV-IV of Figure 2. Figure 5 is a front view of the first zone partition. Figure 6 is a front view of the second partition. Figure 7 is a partial cross-sectional view showing the clarification vessel and the melting tank side by side. Fig. 8 is a front view of another example of the partition plate of the display area. Fig. 9 is a front view of another example of the partition plate of the display area. Fig. 10 is a front view of another example of the partition plate in the display area.

7‧‧‧Main body

7a‧‧‧Ventilation

7b‧‧‧cylindrical body

8a‧‧‧Part 1

8b‧‧‧Second area partition

10‧‧‧First opening

11‧‧‧Second opening

D1‧‧‧Distance between the first partition plate 8a and the ventilation part 7a

D2‧‧‧Distance between the second partition plate 8b and the ventilation part 7a

GM‧‧‧Fused Glass

Claims (12)

A method for producing plate glass, comprising: a melting process for melting glass raw materials in a melting tank to generate molten glass; A process and a forming process for forming the molten glass after the clarification process into a plate glass by a forming tank, the plate glass manufacturing method is characterized in that: the clarification vessel is characterized in that: the above-mentioned molten glass is formed from upstream to downstream. A hollow main body part and a plurality of partition plates arranged at intervals in the main body part are transferred; the main body part is provided with a ventilation which is installed on the upper part and discharges the gas generated in the molten glass part; the partition plate is provided with: a first opening part provided on the upper part and allowing the bubbles formed by the gas to pass therethrough; and a second opening part provided at a position below the first opening part and allowing the molten glass to pass through The opening part; the said clarification process is performed while making the said molten glass contact the whole inner surface of the said main body part so that a gaseous-phase space is not formed in the said clarification container. The method for producing plate glass according to claim 1, wherein the liquid level of the molten glass in the melting tank is set at a position higher than the top of the inner surface of the main body for the purpose of make the above The molten glass is in contact with the entire inner surface of the main body portion. A clarification vessel comprising: a hollow main body portion for transferring molten glass from upstream to downstream, and a plurality of partition plates arranged at intervals in the main body portion, and composed of platinum or platinum alloy The obtained clarification container is characterized in that: the main body part is provided with a ventilation part for discharging the gas generated in the molten glass in the upper part; and the partition plate is provided with: A first opening through which bubbles formed of gas pass, and a second opening provided at a position below the first opening and allowing the molten glass to pass therethrough, and the first opening is formed on the upper portion of the partition plate. formed recesses. The clarification container according to claim 3, wherein the partition plate located on the upstream side of the ventilation part and immediately adjacent to the ventilation part has a distance from the ventilation part of 10 mm or more and 300 mm or less. The clarification container according to claim 3 or 4, wherein the partition plate located on the downstream side of the ventilation part and located immediately adjacent to the ventilation part has a distance from the ventilation part of 10 mm or more and 300 mm or less . The clarification container according to claim 3 or 4, wherein the first opening of the partition plate is more offset in the width direction than the center portion in the width direction of the partition plate. Made on one side. The clarification container according to claim 3 or 4, wherein the plurality of partition plates include: a first partition plate having a side offset from a center portion in the width direction toward one side in the width direction A first opening portion and a second partition plate having a first opening portion offset from the center portion in the width direction toward the other side in the width direction. The clarification container according to claim 3 or 4, wherein the plurality of partition plates are positioned more upstream than the ventilation portion. The clarification container according to claim 3 or 4, wherein the first opening is formed in all of the plurality of partition plates. The clarification container of Claim 3 which is further provided with the partition plate which is arrange|positioned more downstream than the said some partition plate, and does not form the said 1st opening part. A plate glass manufacturing apparatus comprising: a melting tank for melting glass raw materials to generate molten glass, a clarification vessel according to any one of Claims 3 to 10, and molding the molten glass into a plate The glass forming tank, the plate glass manufacturing apparatus, is characterized in that the liquid level of the molten glass in the melting tank is set higher than the top of the inner surface of the main body. A plate glass manufacturing apparatus comprising: a melting tank for melting glass raw materials to generate molten glass, a clarification vessel made of platinum or a platinum alloy, and a forming tank for forming the molten glass into plate glass, and a plate The glass manufacturing apparatus is characterized in that: the clarification vessel is provided with: a hollow main body portion for transferring the molten glass from upstream to downstream, and a plurality of partition plates arranged at intervals in the main body portion; The said main body part is provided with the ventilation part which discharges the gas which generate|occur|produces in the said molten glass in the upper part; The said partition plate is provided with the 1st opening which is provided in the upper part and passes the bubble formed by the said gas. part, and a second opening part provided below the first opening part and allowing the molten glass to pass through; the liquid level of the molten glass in the melting tank is set higher than the top of the inner surface of the main body part higher position.

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