TW201827363A - Sheet glass production method, clarification container, and sheet glass production apparatus - Google Patents

Abstract

This sheet glass production method comprises a fusion step, a clarification step, and a shaping step. In the sheet glass production method, the clarification step is executed while bringing molten glass GM into contact with the entire inner surface of a body part 7 of a clarification container 2 so that no gas phase space is formed therein.

Description

Plate glass manufacturing method, clarification container and plate glass manufacturing device

[0001] The present invention relates to a method for producing plate glass, a clarification container used in the method, and a plate glass manufacturing apparatus including the clarification container.

[0002] As is well known, plate glass is used for flat displays such as liquid crystal displays and organic EL displays. In recent years, with the advent of smart phones or flat-panel terminals, the thickness and weight of flat-panel displays have been reduced, and high-definition has progressed. As a result, the reduction in thickness of sheet glass has also been promoted. As the material of the glass substrate, it is suitable to use alkali-free glass that has less deformation or gravity bending and has excellent dimensional stability under high temperature processes. [0003] Sheet glass is formed into a thin plate shape 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 manufacturing a sheet glass including a clarification process for performing a defoaming treatment. The defoaming treatment is performed in a clarification container made of platinum or a platinum alloy in which a gas phase space is formed. While the molten glass is being passed in the state, the molten glass is heated to release bubbles from the molten glass into the gas phase space. The upper part of the clarification container is provided with a ventilation part (ventilation pipe) that communicates with the gas phase space in the clarification container and exhausts the gas in the gas phase space to the outside. [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 method for manufacturing a sheet glass, 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. In addition, when the gas in the clarification container is discharged from the vent, the platinum volatile components contained in the gas are cooled and solidified and mixed into the molten glass, which may reduce the quality of the plate glass. [0006] The present invention has been developed in view of the above-mentioned shortcomings, and it is a technical problem to perform defoaming treatment of molten glass well and to produce high-quality sheet glass. [Means for Solving the Problem] [0007] The present invention was developed to solve the above-mentioned problems, and is a method for manufacturing sheet glass, which includes a melting process for melting glass raw materials in a melting tank to generate molten glass, and A clarification process in which the molten glass is passed through a clarification container made of platinum or a platinum alloy to defoam, and a forming process for forming the molten glass after the clarification process into a sheet glass through a forming tank. The glass manufacturing method is characterized in that the clarification container includes a hollow body portion that transfers the molten glass from upstream to downstream, and a plurality of partition plates that are arranged at intervals on the body portion; The main body portion is provided with a vent portion provided on an upper portion thereof and exhausts a gas generated in the molten glass; and the zone partition plate is provided with a first portion provided on the upper portion and configured to pass bubbles formed by the gas. An opening portion, and a second opening portion provided below the first opening portion and allowing the molten glass to pass through; The method of preventing the gas phase space from being formed in the clarification container, and performing the clarification process while bringing the molten glass into contact with the entire inner surface of the body portion. [0008] According to this method, when the clarification process is performed, the internal space of the main body portion in the clarification container is completely filled with molten glass, so that a gas phase space is not formed between the inner surface of the main body portion and the molten glass. In addition, the partition plate provided in the main body portion allows the bubbles formed by the gas generated in the molten glass to pass through the first opening portion and be guided toward the vent portion. Thereby, platinum can be prevented from being volatilized from the inner surface of the main body part in the high-temperature gas-phase space as before. Therefore, it is possible to prevent the mixing of platinum into the molten glass and perform a good defoaming treatment of the molten glass, and it is possible to produce a high-quality sheet glass. [0009] In the above-mentioned case, the liquid level of the molten glass in the melting tank is set higher than the top of the inner surface of the body portion so that the molten glass contacts the body portion. All the inner surfaces are better. Thereby, the molten glass is brought to the top of the inner surface in the main body portion, and the clarification process can be performed without forming a gas phase space between the inner surface of the main body portion and the molten glass. [0010] The present invention has been developed to solve the above-mentioned problems, and is a clarification container including a hollow body portion that transfers molten glass from upstream to downstream, and is disposed on the body portion at intervals. The clarified container composed of a plurality of partition plates and made of platinum or platinum alloy is characterized in that: the main body part is provided with an air vent portion on the upper part thereof for discharging gas generated in the molten glass; The zone partition is provided with a first opening portion provided on an upper portion thereof and passing bubbles formed by the gas, and a second opening portion provided below the first opening portion and allowing the molten glass to pass therethrough. . [0011] When performing the clarification process, it is necessary to guide the air bubbles generated in the molten glass to the aeration portion. In the present invention, the clarification container is capable of reliably guiding the bubbles to the venting portion by passing bubbles through the first opening formed in the upper part of the partition plate, thereby performing a good defoaming treatment of the molten glass. . [0012] In the clarification container configured as described above, the distance between the zone partition and the zone partition, which is located more upstream than the ventilation portion and is located immediately adjacent to the ventilation portion, is preferably 10 mm or more and 300 mm or less. Further, on the downstream side of the ventilating portion and located immediately adjacent to the ventilating portion, the distance from the ventilating portion is preferably 10 mm or more and 300 mm or less. As described above, by separating the vent portion and the partition plate at an appropriate distance, the bubbles in the molten glass can be guided to the vent portion extremely appropriately. [0013] In the clarification container configured as described above, it is preferable that the first opening portion of the zone partition plate is offset to one side of the width direction than a center portion in a width direction of the zone partition plate. . The plurality of partition plates include a first partition plate having a first opening portion offset from a center portion in the width direction toward one side of the width direction, and a second partition plate. It is preferable that the first opening portion is offset from the center portion in the width direction toward the other side in the width direction. [0014] It is preferable that the plurality of zone partition plates are positioned more upstream than the ventilation portion. It is preferable that the first openings are formed in all of the plurality of partition plates. [0015] Further, in the clarification container of the present invention, the first opening portion may be a recessed portion formed on an upper portion of the plurality of partition plates. [0016] The clarification container of the present invention may further include a zone partition which is arranged further downstream than the plurality of zone partitions and does not form the first opening portion. By arranging the partition plate on the most downstream side without forming the first opening in this way, when the molten glass is transferred from the clarification container to the next process, bubbles generated in the molten glass can be prevented from being moved together with the molten glass. Go to the next process. [0017] The present invention has been developed to solve the above-mentioned problems, and is a sheet glass manufacturing apparatus including a melting tank that melts glass raw materials to generate molten glass, the above-mentioned clarification container, and shapes the molten glass into A plate glass forming tank and a plate glass manufacturing apparatus are 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 body portion. [0018] According to this configuration, when the clarification process is performed, the entire interior space of the body portion of the clarification container can be filled with the molten glass. Thereby, a gas phase space is not formed between the inner surface of the main body portion and the molten glass. Therefore, there is no case where platinum is volatilized on the inner surface of the body portion due to the high-temperature gas phase space as in the past. This prevents the volatile platinum from being mixed in the molten glass, enables good defoaming treatment of the molten glass, and enables production of high-quality sheet glass. [Effects of the Invention] [0019] According to the present invention, it is possible to perform a good defoaming treatment of the molten glass and to produce a high-quality sheet glass.

[0021] Hereinafter, an embodiment for implementing the present invention will be described with reference to the drawings. 1 to 10 show one embodiment of a sheet glass manufacturing apparatus and a sheet glass manufacturing method according to the present invention. [0022] As shown in FIG. 1, the plate glass manufacturing apparatus of this embodiment includes a melting tank 1, a clarification vessel 2, a homogenization tank (stirring tank) 3, and a state adjustment tank 4 in order from the upstream side. , Forming grooves 5, and glass supply flow paths 6a to 6d connecting the respective grooves 1 to 5. In addition, the sheet glass manufacturing apparatus can also be provided with a chilling furnace (not shown) for chilling the sheet glass GR formed in the forming tank 5 and a cutting device for cutting the sheet glass GR after the chilling. (Illustration omitted). [0023] The melting tank 1 is a container for performing a melting process, and the melting process is a process of melting the input glass raw material to obtain a molten glass GM. The melting tank 1 is connected to the clarification container 2 via a glass supply flow path 6a. The clarification container 2 is a container for performing a clarification process. The clarification process is a process for 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 a glass supply flow path 6b. [0024] The homogenization tank 3 is a container for performing a homogenization process, and the homogenization process is a process in which the clarified molten glass GM is stirred by a stirring blade or the like to make the homogenization. The homogenization tank 3 is connected to the state adjustment tank 4 via a glass supply flow path 6c. The state adjustment tank 4 is a container for performing a state adjustment process which adjusts the molten glass GM to a state suitable for forming. The state adjustment tank 4 is connected to the forming tank 5 through a 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 is configured to form the molten glass GM into a plate shape by an overflow downdraw method. Specifically, the cross-sectional shape of the forming groove 5 (a cross-sectional shape perpendicular to the paper surface in FIG. 1) is formed into a substantially wedge shape, and an overflow groove (not shown) is formed in the upper portion of the forming groove 5. . [0026] The forming tank 5 is such that molten glass GM is supplied to the overflow groove through the glass supply flow path 6d, and the molten glass GM overflows from the overflow groove, and then runs along the side wall surfaces on both sides of the forming groove 5. The side on the back side of the paper surface) flows down. The forming tank 5 is formed into a plate shape by fusing the molten glass GM that has flowed down at the lower top of the side wall surface. [0027] The formed sheet glass GR has a thickness of, for example, 0.01 to 10 mm, and is used as a substrate or a protective cover for a liquid crystal display, an organic EL display, a flat display, an organic EL lighting, a solar cell, or the like. The forming groove 5 may be implemented by another down draw method such as a slot down draw method. [0028] Hereinafter, a specific configuration of the clarification container 2 will be described with reference to FIGS. 2 to 10. The clarification container 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. Each of the main body portion 7, the partition plate 8, and the heating portion 9 is formed in a predetermined shape from platinum or a platinum alloy. [0029] Although the main body portion 7 has a cylindrical shape having a predetermined length, it is not limited to this shape, as long as it is hollow and has a space through which the molten glass GM flows inside. A glass supply flow path 6 a connecting the melting tank 1 to the main body portion 7 is connected to one end portion (upstream side end portion) in the longitudinal direction of the main body portion 7. A glass supply flow path 6 b connecting the homogenization tank 3 to the main body portion 7 is connected to the other end portion (downstream side end portion) in the longitudinal direction of the main body portion 7. [0030] The main body portion 7 is provided with a vent portion 7a (vent tube) for exhausting gas generated in the molten glass GM. The ventilation portion 7 a is provided so as to protrude upward from the upper portion of the main body portion 7. The ventilation portion 7 a is formed in a cylindrical shape (for example, a cylindrical shape), and 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 vent portion 7 a is made of platinum or a platinum alloy in the same manner as the main body portion 7. [0031] The main body portion 7 includes a plurality of cylindrical bodies 7b. The main body portion 7 is formed by the cylindrical body 7b and the partition plate 8 being connected alternately. Although the cylindrical body 7b has a cylindrical shape, it is not limited to this shape. The ventilation portion 7a may be formed integrally with one of the plurality of cylindrical bodies 7b. [0032] Although the partition plate 8 is formed in a disc shape, it can be configured to have a shape appropriate to the shape of the main body portion 7 without being limited to this shape. Part of the surface of the partition plate 8 is an end surface of a cylindrical body 7 b fixed to the body portion 7. The diameter of the partition plate 8 is set to be the same as the outer diameter of the cylindrical body 7 b in the main body portion 7. [0033] Hereinafter, among the plurality of zone partitions 8, a zone partition (hereinafter referred to as a "first zone partition") 8a on the upstream side of the ventilation portion 7a and immediately adjacent to the ventilation portion 7a, and A zone partition (hereinafter referred to as a "second zone partition") 8b immediately downstream of the ventilation portion 7a is described as an example on the downstream side of the ventilation portion 7a, and is described with reference to FIGS. 3 to 6. [0034] In the following description, a vertical line passing through the center portion O of each partition plate 8 is referred to as a “first center line” (indicated by a symbol Y1), and The horizontal line is called the "second center line" (indicated by the symbol X1). The direction along the first center line Y1 is referred to as the "up and down direction" (indicated by symbol Y), and the direction along the second center line X1 is referred to as the "width direction" (indicated by symbol X). Also, in each partition plate 8, a portion above the first center line Y1 is referred to as the "upper portion" of the partition plate 8, and a portion below the first center line Y1 is referred to as the region. The "lower part" of the partition plate 8. [0035] In the longitudinal direction of the main body portion 7, the distance D1 between the first partition 8a and the vent portion 7a is preferably set to 10 mm or more and 300 mm or less. The distance D2 between the second partition 8b and the ventilation portion 7a is preferably set to be 10 mm or more and 300 mm or less. [0036] The first partition 8a and the second partition 8b are each provided with a first opening 10 provided on an upper portion thereof and passing through the bubbles B formed by the gas generated in the molten glass GM, and The second opening portion 11 is provided below the first opening portion 10 and allows the molten glass GM to pass through. As shown in FIGS. 3 to 6, the first opening portion 10 is a through hole formed inside the peripheral portion of the partition plate 8. The first opening portion 10 is formed above the second opening portion 11. The opening area of the second opening portion 11 is set to be larger than the opening area of the first opening portion 10. [0037] The first opening portion 10 is mainly used to circulate the bubbles B formed by the gas generated in the molten glass GM. On the other hand, the second opening portion 11 is mainly used for circulating the molten glass GM. [0038] Although the first opening portion 10 of the first partition plate 8a and the second partition plate 8b has a sector shape with a center angle of about 90 degrees as shown in FIG. 4, it is not limited to this shape. . As shown in FIGS. 4 and 5, the first opening portion 10 of the first partition plate 8 a is offset from one side of the width direction X with respect to the center portion O of the first partition plate 8 a. [0039] That is, as shown in FIG. 5, the first opening portion 10 of the first partition 8a is formed on one side of the first center line Y1 that is offset in the width direction X (for Figure 5 is on the right side of the page). The first opening portion 10 of the second partition plate 8b is offset from the center portion O of the second partition plate 8b to the other side in the width direction X. That is, as shown in FIG. 6, the first opening portion 10 of the second partition 8 b is formed on the other side of the width direction X that is offset from the first center line Y1 (to the sixth side). The left side of the drawing is on the paper. In other words, the first opening portion 10 of the second partition plate 8b is offset on the opposite side to the first opening portion 10 of the first partition plate 8a in the width direction X. [0040] The second opening 11 of the first partition 8a is formed in an oval shape when viewed from the front. The center portion of the second opening portion 11 coincides with the center portion O of the first partition 8a. The second opening portion 11 of the second partition plate is formed in a lower portion of the second partition plate 8b. The second opening portion 11 is configured 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 such that its linear portion is above and its arc portion is below the linear portion. The center portion of the second opening portion 11 is located at a position shifted downward from the center portion O of the second partition 8b. Therefore, the second opening portion 11 of the first partition plate 8a and the second opening portion 11 of the second partition plate 8b are deviated from each other in the position in the vertical direction Y when viewed from the front. In this way, by making the formation position of the second opening portion 11 different in each of the partition plates 8 (8a, 8b), the molten glass GM flowing in the main body portion 7 is meandered, and a good defoaming treatment can be performed. . [0041] As shown in FIG. 2, the heating portion 9 includes a flange portion 12 formed so as to surround an end peripheral edge of the main body portion 7, and an electrode portion 13 formed on an upper portion of the flange portion 12. . The flange portion 12 and the electrode portion 13 are made of platinum or platinum alloy in the same manner as the body portion 7. The heating portion 9 directly heats the main body portion 7 by applying a predetermined voltage to the electrode portion 13. Thereby, the clarification container 2 can maintain the molten glass GM flowing in the main body part 7 at a predetermined temperature during a clarification process. [0042] 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 portion 7, or it The top 7c is in the same position. The height difference H is not limited to this range, although it is set to 0 mm or more and 200 mm or less. With this setting, the entire internal space of the main body portion 7 is filled with the molten glass GM flowing from the melting tank 1. That is, in the inside of the main body portion 7, the upper inner surface of the main body portion 7 is not separated from the molten glass GM, but the entire inner surface is in contact with the molten glass GM (see FIG. 3). In this way, since the molten glass GM contacts the entire inner surface of the main body portion 7, no gas phase space is formed in the main body portion 7. [0043] Among the partition plates 8 disposed in the main body portion 7, the first partition portion 10 is not formed in the partition plate 8c (see FIG. 2) disposed on the most downstream side. With this partition 8, it is possible to prevent the bubbles B generated in the molten glass GM from being transferred to the downstream side of the clarification container 2. 8 to 10 are other examples of the display area partition plate 8. In these examples, the configuration of the first opening portion 10 is different from the examples shown in FIGS. 5 and 6. In the example shown in FIG. 8, the first opening portion 10 as the partition plate 8 is a recessed portion formed by cutting out the upper end of the partition plate 8. The recessed 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 that the peripheral portion of the partition plate 8 is brought into contact with the inner surface of the cylindrical body 7 b in the main body portion 7 to constitute 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 with the first center line Y1 interposed therebetween. Each first opening 10 is offset from the first center line Y1 of the partition plate 8 in the width direction X. The pair of first openings 10 is provided so as to be line-symmetrical with respect to the first center line Y1. [0046] In the example shown in FIG. 10, the first opening portion 10 is configured in a semicircular shape. Specifically, a straight portion of the first opening portion 10 is located at a lower position, and an arc portion is formed at the partition plate 8 so as to be located at an upper position. The center portion of the first opening portion 10 is offset from the center portion O of the partition plate 8 in the width direction X. That is, the first opening portion 10 passes through the center portion's vertical line (center line) Y2, and is located at one side (right side) of the width direction X than the first center line Y1 of the partition plate 8. Therefore, the first opening portion 10 is asymmetric with respect to the first center line Y1 of the partition plate 8 (there is no line symmetry with respect to the first center line Y1). [0047] Hereinafter, a method for manufacturing sheet glass GR using the sheet glass manufacturing apparatus configured as described above will be described. In this method, the raw glass is melted (melting process) in the melting tank 1 to obtain the molten glass GM. A clarifying agent is prepared in the glass raw material, and a gas (air bubble) is generated by the action of the clarifying agent in the molten glass GM. As the clarifier, As ₂ O ₃ , Sb ₂ O ₃ , SnO ₂ , Fe ₂ O ₃ , SO ₃ , F, Cl, or the like can be used. However, As ₂ O ₃ and Sb ₂ O ₃ are environmentally-loaded substances, and their use should be avoided to the utmost extent. SnO _{2 is} best used as a clarifying agent. [0048] In the clarification process, the molten glass GM supplied from the melting tank 1 through the glass supply flow path 6a is made from one end (upstream) to the other end (downstream) of the main body 7 in the clarification container 2. mobile. The main body portion 7 is heated by the heating portion 9 to maintain the temperature of the flowing molten glass GM at 1300 to 1500 ° C. In this clarification process, the bubbles B caused by the gas generated by the oxidizing and reducing action of the clarifier are floated (see FIG. 3). The bubbles B pass through the first openings 10 of the partition plates 8 together with the molten glass GM, and then 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 bubble B that has passed through the vent portion 7a may pass through the first opening portion 10 of the partition plate 8 (second partition plate 8b) located downstream of the vent portion 7a, and then flow as The vent portion 7a is discharged. [0049] Next, the molten glass GM subjected to clarification (defoaming treatment) is transferred to the 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 forming process, molten glass GM is formed into sheet glass GR by a forming tank 5 (see 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 sheet glass GR is rolled into a roll shape without being cut after the soaking process. [0050] According to the sheet glass manufacturing method of this embodiment described above, when the clarification process is performed, the molten glass GM is filled in the entire internal space of the main body portion 7 of the clarification container 2. That is, the molten glass GM flows from the upstream to the downstream of the main body portion 7 while contacting the entire (full surface) of the inner surface of the main body portion 7. Therefore, no gas-phase space is formed between the inner surface of the main body portion 7 and the molten glass GM. [0051] Therefore, on the inner surface of the main body portion 7, platinum is not volatilized due to a high-temperature gas phase space as before. This prevents the volatilized platinum from being mixed into the molten glass GM as in the past. Moreover, since the partition plate 8 provided in the main body portion 7 has the first opening 10 through which the bubbles B generated in the molten glass GM can pass, the gas (bubbles B) in the molten glass GM can pass through the first One opening portion 10 is surely discharged from the vent portion 7a. [0052] The present invention is not limited by the configuration of the above-mentioned embodiment, nor is it limited by the above-mentioned effects. The present invention can be modified in various ways without departing from the spirit and scope of the present invention. [0053] In the above-mentioned embodiment, the example in which the first opening portion 10 of the partition plate 8 is biased toward the width direction than the center portion O of the partition plate 8 is shown, but it is not limited thereto. limited. The first opening portion 10 may be configured such that the center portion thereof coincides with the center portion O of the partition plate 8 in the width direction X. [0054] In the embodiment described above, 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 it is not limited thereto. In the present invention, for example, a configuration may be adopted in which the plurality of partition plates 8 are arranged only on the upstream side of the vent portion 7a. In this case, only the partition plate 8 which does not have the first opening portion 10 may be arranged on the downstream side of the vent portion 7a as its configuration. [0055] In the above-mentioned embodiment, the clarification container 2 provided with a single vent portion 7a is provided in the main body portion 7, but the structure is not limited to this. The main body portion 7 may be provided with a plurality of ventilation portions 7 a at intervals in the longitudinal direction thereof. In this case, the plurality of partition plates 8 may be arranged on the upstream side than the ventilation portion 7a positioned on the most downstream side. Further, the partition plate 8 including the first opening portion 10 and the second opening portion 11 may be disposed further downstream than the ventilation portion 7a on the most downstream side, or the first partition portion 10 (only having The partition plate 8 of the second opening 11). [0056] In the embodiment described above, although the sheet glass manufacturing apparatus having one melting tank 1 is exemplified, the present invention is not limited to this configuration. The sheet glass manufacturing apparatus may include a plurality of melting tanks 1.

[0057]

1‧‧‧ melting tank

2‧‧‧ clarification container

3‧‧‧ Homogenizing tank (stirring tank)

4‧‧‧ state adjustment slot

5‧‧‧forming groove

6a ～ 6d‧‧‧ glass supply flow path

7‧‧‧Body

7a‧‧‧Ventilation Department

7b‧‧‧Tube

8‧‧‧ partition

8a‧‧‧ first zone partition

8b‧‧‧Second zone partition

9‧‧‧ heating section

10‧‧‧First opening

11‧‧‧Second opening

12‧‧‧ flange

13‧‧‧electrode section

D1‧‧‧The distance between the first partition 8a and the ventilation part 7a

D2‧The distance between the second partition 8b and the ventilation part 7a

GM‧‧‧ Molten Glass

GR‧‧‧ Plate Glass

GS‧‧‧Liquid level

H‧‧‧Height difference

O‧‧‧ Center

X‧‧‧Width direction

X1‧‧‧Second Centerline

Y‧‧‧ Up and down direction

Y1‧‧‧First Centerline

[0020] FIG. 1 is a side view of the overall configuration of a display panel 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. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. Figure 5 is a front view of the first partition. Figure 6 is a front view of the second partition. FIG. 7 is a partial cross-sectional view showing a clarification vessel and a melting tank side by side. FIG. 8 is a front view of another example of the display partition. FIG. 9 is a front view of another example of a display partition. FIG. 10 is a front view of another example of the display partition.

Claims (12)

A sheet glass manufacturing method includes a melting process for melting glass raw materials in a melting tank to generate molten glass, and clarification for defoaming by passing the molten glass through a clarification container made of platinum or a platinum alloy. The manufacturing process and the forming process for forming the molten glass after the clarification process into a sheet glass by a forming tank, the method for manufacturing a sheet glass, which is characterized in that the clarification container includes: performing the molten glass from upstream to downstream. The hollow body portion is transferred, and a plurality of partition plates arranged at intervals on the body portion; The body portion is provided with ventilation provided on the upper portion and exhausting the gas generated in the molten glass. The zone partition is provided with a first opening portion provided on an upper portion thereof and passing bubbles formed by the gas, and a second opening portion provided below the first opening portion and passing the molten glass. Opening; 一边 so that the gas phase space is not formed in the clarification container, one side The molten glass is brought into contact with the entire inner surface of the body portion, and the clarification process is performed. The method for manufacturing sheet glass according to item 1 of the scope of patent application, wherein the liquid level of the molten glass trapped in the melting tank is set higher than the top of the inner surface of the main body portion for The molten glass is brought into contact with the entire inner surface of the body portion. A clarification container includes a hollow body portion that transfers molten glass from upstream to downstream, and a plurality of zone partitions arranged at intervals on the body portion, and is composed of platinum or platinum alloy. The clarified container is characterized in that: the main body portion is provided with an air vent portion for discharging gas generated in the molten glass on the upper portion thereof; ； the zone partition plate is provided with: A first opening portion through which a bubble formed by a gas passes, and a second opening portion provided at a position below the first opening portion and passing the molten glass. The clarification container according to item 3 of the scope of the patent application, wherein the radon is located on the upstream side of the vent portion and is located immediately adjacent to the vent portion, and the distance from the vent portion is 10 mm or more and 300 mm or less. The clarification container according to item 3 or 4 of the scope of patent application, wherein is located on the downstream side of the vent portion and is located in the zone partition immediately adjacent to the vent portion, and the distance from the vent portion is 10 mm or more and 300 mm or less . The clarification container according to item 3 or 4 of the scope of patent application, wherein: (1) the first opening portion of the partition plate is more biased in the width direction than the center portion in the width direction of the partition plate; From one side. The clarification container according to item 3 or 4 of the scope of patent application, wherein: the plurality of zone partitions include: a first zone partition having a side deviation from a center portion in a width direction toward one side in the width direction; The first opening portion and the second partition plate which are disposed have a first opening portion that is offset from the center portion in the width direction toward the other side in the width direction. The clarification container according to item 3 or 4 of the scope of patent application, wherein: the plurality of zone partitions are positioned more upstream than the ventilation portion. The clarification container according to item 3 or 4 of the scope of patent application, wherein the first opening is formed on all of the plurality of partition plates. The clarification container according to item 3 or 4 of the scope of patent application, wherein: (1) The first opening portion is a recessed portion formed on an upper portion of the partition plate. The clarification container according to item 3 of the scope of patent application, wherein the osmium further includes a zone partition which is arranged further downstream than the plurality of zone partitions and does not form the first opening portion. A sheet glass manufacturing apparatus includes a melting tank that melts glass raw materials to generate molten glass, a clarification container described in any one of claims 3 to 11 in the scope of patent application, and forming the molten glass into a sheet. A glass forming tank and a plate glass manufacturing device are characterized in that: 的 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 portion.