CN112119043A - Method and apparatus for manufacturing glass article, and glass substrate - Google Patents
Method and apparatus for manufacturing glass article, and glass substrate Download PDFInfo
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- CN112119043A CN112119043A CN201980032086.7A CN201980032086A CN112119043A CN 112119043 A CN112119043 A CN 112119043A CN 201980032086 A CN201980032086 A CN 201980032086A CN 112119043 A CN112119043 A CN 112119043A
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- molten glass
- glass
- tank
- glass article
- flow path
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/14—Transferring molten glass or gobs to glass blowing or pressing machines
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/167—Means for preventing damage to equipment, e.g. by molten glass, hot gases, batches
- C03B5/1672—Use of materials therefor
- C03B5/1675—Platinum group metals
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
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- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Glass Melting And Manufacturing (AREA)
Abstract
The method comprises a melting step for producing molten glass (Gm), a transfer step for transferring the molten glass (Gm) by means of a transfer device (3) having a clarifying tank (5) and a stirring vessel (7), and a shaping step for shaping the transferred molten glass (Gm) by means of a shaping mechanism (4), wherein the step of introducing the molten glass (Gm) into the clarifying tank (5) comprises a maintenance step for maintaining the liquid level of the molten glass (Gm) in the clarifying tank (5) at the liquid level during the transfer step and the shaping step by blocking the molten glass (Gm) by means of a blocking member (16) disposed in a flow path (6) between the clarifying tank (5) and the stirring vessel (7).
Description
Technical Field
The present invention relates to a method for producing glass articles, and more particularly to a technique for setting a transfer device having a clarifying tank and a stirring tank in an appropriate state at the start-up before the start of operation.
Background
As is well known, when manufacturing glass articles, a transfer device is used to supply molten glass flowing out of a melting furnace to a forming device. The transfer device has a transfer container for transferring molten glass.
As an example, patent document 1 discloses a transfer device including a clarifying tank, a stirring tank, a cooling pipe, a tank, and the like as a transfer container in this order from the upstream side. The transfer flow path including these transfer containers is generally formed by a member made of a noble metal (for example, platinum or a platinum alloy).
On the other hand, patent document 2 discloses a configuration in which molten glass is introduced into a glass supply pipe 1 as a transfer container, a clarifier, a glass supply pipe 2, a stirrer, and a glass supply pipe 3 in this order at the time of startup. Further, this document describes: in the process of introducing molten glass into each of these transfer containers, temperature rise control is performed for raising the temperature of each transfer container to the working temperature.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2014-19629
Patent document 2: japanese patent laid-open publication No. 2017-178733
Disclosure of Invention
Problems to be solved by the invention
However, as disclosed in patent document 2, there is a problem to be solved even if temperature raising control for raising the temperature of each transfer container to the working temperature is strictly performed at the time of start-up.
That is, the temperature of the clarifying tank during operation may be the highest among the respective transfer containers. Accordingly, the temperature of the fining vessel tends to be higher than the temperature of the other transfer container in the process of starting the introduction of the molten glass at the time of startup. Therefore, during the process of introducing the molten glass into the clarifier at the time of startup, the clarifier is in an empty state and is likely to be oxidized. As a result, foreign matter such as platinum is mixed into the molten glass in the fining vessel, which may cause product defects, quality degradation, and the like.
In consideration of the contamination of the platinum foreign matter into the molten glass, it is important to make the form and amount of the platinum foreign matter contained in the glass substrate appropriate in order to improve the quality of the product, particularly the glass substrate.
From the above viewpoint, the first object of the present invention is to create a state in which oxidation is less likely to occur in the fining tank during the introduction of molten glass into the fining tank at the time of startup, and to suppress the mixing of foreign matter into the molten glass in the fining tank as much as possible. In addition, a second object of the present invention is to improve the quality of a glass substrate by adjusting the form and amount of platinum foreign matter contained in the glass substrate.
Means for solving the problems
The method of the present invention for solving the first problem is a method for manufacturing a glass article, including: a melting step of heating and melting a glass raw material in a melting furnace to produce molten glass; a transfer step of transferring the molten glass flowing out of the melting furnace to a forming mechanism by a transfer device having a clarifying tank disposed downstream of the melting furnace and a stirring vessel disposed downstream of the clarifying tank; and a forming step of forming the molten glass supplied from the transfer device into a predetermined shape by the forming mechanism, wherein the method for producing a glass article further includes an introduction step of introducing the molten glass flowing out of the melting furnace into the transfer device before the transfer step and the forming step are started, and the introduction step includes a maintaining step of maintaining a liquid level of the molten glass in the clarifying tank at a liquid level at the time of execution of the transfer step and the forming step by blocking the molten glass by a blocking member disposed in a flow path between the clarifying tank and the stirring vessel.
According to this method, in the introduction step at the time of startup, the molten glass that has flowed out of the melting furnace and started to be introduced into the fining vessel is blocked by the blocking member between the fining vessel and the stirring vessel. Therefore, the molten glass is stored in the fining vessel on the upstream side of the dam member, and the liquid level of the molten glass in the fining vessel can be maintained at the liquid level during the operation (during the transfer step and the forming step) in a short time. As a result, the clarifying tank which is at a higher temperature than the other transfer container at the time of starting can quickly prevent the empty boiling state. Thus, oxidation is less likely to occur in the clarifier, and it is possible to efficiently avoid mixing devitrified foreign matter (platinum foreign matter, etc.) into the molten glass at an appropriate position.
In this case, it is preferable that the stopper member is a shutter for opening and closing the flow path, and the opening degree of the flow path is adjusted by the shutter, whereby the liquid level of the molten glass in the clarifier is maintained at the liquid level during the transfer step and the forming step.
In this way, the flow rate of the molten glass at the position where the shutter is disposed can be finely adjusted by only providing a simple structure in which the shutter is slid (for example, moved up and down). This makes it possible to easily variably control the degree of inhibition of the flow of the molten glass.
In the above method, preferably, in the maintaining step, the molten glass in the clarifier is transferred to the stirrer and discharged from a drain hole opened in an inner bottom surface of the stirrer.
In this way, the molten glass in the fining vessel can be made to flow at all times. Thus, the molten glass is retained in the clarifier for a long time and is in a boiled-dry state (a state of being mixed with boiling), and the change of the molten glass into heterogeneous glass and the like are difficult to occur.
In the above method, it is preferable that the clarifying tank in the maintaining step is filled with molten glass in the same manner as the clarifying tank in the transferring step at the time of performing the forming step.
In this way, since the gas phase space is not formed in the clarifying tank in both the maintaining step and the transferring step, the loss due to volatilization of the noble metal constituting the clarifying tank can be reduced. In addition, the generation of precious metal substances caused by the aggregation of precious metals after volatilization and the incorporation of the precious metals into molten glass can be further reduced. In the present invention, when the clarifier is filled with molten glass, the height of the liquid surface of the molten glass in the clarifier is the height of the top of the inner surface of the clarifier.
In the above method, it is preferable that the temperature of the molten glass in the fining tank in the maintaining step is lower than the temperature of the molten glass in the fining tank in the transferring step when the forming step is performed.
In this way, the flow rate of the molten glass flowing out of the fining vessel per unit time can be reduced by maintaining the flow rate of the molten glass in the step to be low.
An apparatus according to the present invention for solving the first problem is an apparatus for manufacturing a glass article, including: a melting furnace that heats and melts a glass raw material to produce molten glass; a transfer device which has a clarification tank disposed downstream of the melting furnace and a stirring vessel disposed downstream of the clarification tank, and transfers the molten glass flowing out of the melting furnace; and a forming mechanism for forming the molten glass supplied from the transfer device into a predetermined shape, wherein the glass article manufacturing apparatus is further provided with a blocking member in a flow path between the fining tank and the stirring vessel in order to block the molten glass flowing out of the melting furnace.
According to the apparatus having such a configuration, oxidation is less likely to occur in the fining vessel, and the mixing of devitrified foreign matter (platinum foreign matter, etc.) into the molten glass can be effectively avoided at an appropriate position, as in the case of the above-described method.
In this case, it is preferable that the blocking member is a shutter that opens and closes the flow path.
In this case, as in the above-described method, the degree of inhibition of the flow of the molten glass can be easily variably controlled by only having a simple structure in which the shutter is slid.
In this apparatus, it is preferable that the shutter be insertable into and removable from an opening provided in an upper portion of a peripheral wall forming the flow path, and the glass article manufacturing apparatus be configured such that a cover covers the opening when the shutter is removed.
In this way, when the shutter is removed, it is possible to avoid a disadvantage that may occur due to the opening of the opening. Specifically, even if tin oxide or the like in the molten glass remaining in the flow path (in the peripheral wall) is volatilized during the transfer step and the molding step, the vicinity of the opening portion is always maintained at a high temperature, and thus the volatile matter can be prevented from being liquefied or solidified and adhering to the inner surface in the vicinity of the opening portion. Therefore, the adhered volatile matter can be appropriately prevented from falling into the molten glass and becoming foreign matter. Further, since the amount of heat radiated from the opening portion is greatly reduced, the effect of preventing devitrification in the vicinity of the liquid surface of the molten glass is also obtained. As a result, the quality of the glass article as a product can be improved and the yield of the product can be improved.
In the apparatus, it is preferable that the cover has an exhaust passage for discharging the gas present in the passage.
In this manner, the gas (mainly, the vapor obtained by vaporizing the molten glass) present in the flow path is actively released to the outside through the exhaust flow path. Therefore, the gas flows through the exhaust gas flow passage preferentially to the gap along the lower surface of the lid body. As a result, it is possible to avoid the disadvantage that may occur when the flow rate of the gas flowing out from the gap along the lower surface of the lid body is large. As an example of such drawbacks, the opening on the outer peripheral side of the peripheral wall is covered with a refractory material at its periphery, and a cooling pipe for cooling an electrode for heating the peripheral wall by supplying electricity is disposed at its periphery. Therefore, the gas flowing out of the gap along the lower surface of the lid body may contact the cooling pipe by erosion of the refractory or the like. When this occurs, the cooling pipe may be damaged or broken due to corrosion or the like caused by oxidation. In contrast, the provision of the exhaust gas flow path can reduce the amount of gas flowing out of the gap along the lower surface of the lid body, and therefore damage to the cooling pipe and the like can be suppressed.
In the above apparatus, it is preferable that the lid body has a side wall portion surrounding a space above the opening portion from an outer peripheral side and a top wall portion covering an upper side of the side wall portion, and the outlet of the exhaust gas flow path is provided in the side wall portion.
In this way, it is possible to effectively prevent the volatile matter adhering to the exhaust passage from falling down into the molten glass and becoming foreign matter. As described in detail, since the vicinity of the outlet of the exhaust gas flow path is affected by the external air and the temperature is lowered, volatile substances such as tin oxide contained in the gas are likely to adhere to the inner peripheral surface of the outlet and aggregation of the adhered volatile substances is likely to occur. Therefore, when the outlet of the exhaust gas flow path is formed in the ceiling wall portion, the volatile matter adhering to the inner peripheral surface of the outlet may fall downward with time and be mixed as foreign matter into the molten glass. In contrast, when the outlet of the exhaust gas flow path is provided in the side wall portion, the volatile matter adhering to the inner peripheral surface of the outlet is less likely to fall downward toward the bottom of the vertical direction, and the probability of the volatile matter being mixed into the molten glass as foreign matter is reduced.
The glass substrate of the present invention, which has been made to solve the second problem, is characterized in that the ratio of the major axis dimension to the minor axis dimension is 15 or more and the number of platinum foreign matters having a major axis dimension of 3 μm or more is 1/kg or less.
The present inventors have conducted extensive studies and, as a result, have found the form and content of platinum foreign matter, which is the largest cause of quality degradation, and have obtained the glass substrate. Therefore, the glass substrate has a very high quality as compared with a conventional glass substrate.
Effects of the invention
According to the present invention for solving the first problem, in the process of introducing molten glass into the clarifier at the time of startup, a state in which oxidation is less likely to occur is created in the clarifier, and the mixing of foreign matter into the molten glass in the clarifier is suppressed as much as possible. According to the present invention for solving the second problem, the form and amount of the platinum foreign matter contained in the glass sheet are appropriate, and the quality of the glass sheet is improved.
Drawings
Fig. 1 is a schematic side view showing the overall configuration of a manufacturing apparatus for carrying out a method of manufacturing a glass article according to an embodiment of the present invention.
Fig. 2 is a vertical cross-sectional side view showing a transfer device, which is a main part of a manufacturing apparatus for carrying out the method of manufacturing glass articles according to the embodiment of the present invention.
Fig. 3 is a longitudinal sectional side view of a main part showing a state at the time of startup of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 4 is a front view of a main part of fig. 3 taken along line a-a in a schematic longitudinal section.
Fig. 5 is a longitudinal sectional side view of a main part showing a state at the time of startup of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 6 is a perspective view showing an upper structure of an additional tank, which is a component of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 7 is a perspective view showing a first example of an upper structure of an attached tank, which is a component of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 8 is a longitudinal sectional front view taken along line B-B of fig. 7.
Fig. 9 is a perspective view showing an example of a lid body used in a first example of an upper structure with a tank, which is a component of a manufacturing apparatus for carrying out a method for manufacturing a glass article according to an embodiment of the present invention.
Fig. 10 is a perspective view showing another example of the lid body used in the first example of the upper structure with a tank, which is a component of the manufacturing apparatus for carrying out the method for manufacturing a glass article according to the embodiment of the present invention.
Fig. 11 is a front vertical sectional view for explaining a problem of a first example of an upper structure with a tank, which is a component of a manufacturing apparatus for carrying out a method of manufacturing a glass article according to an embodiment of the present invention.
Fig. 12 is a side view of the entire additional tank for explaining a problem of a first example of the upper structure of the additional tank, which is a component of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 13 is a perspective view showing a second example of the upper structure of the attached tank, which is a component of the manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 14 is a longitudinal sectional front view taken along line C-C of fig. 13.
Fig. 15 is a vertical cross-sectional front view showing a third example of the upper structure with a tank, which is a component of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 16 is a vertical cross-sectional front view showing a fourth example of the upper structure with a tank, which is a component of a manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 17 is a perspective view showing a fifth example of the upper structure of the attached tank, which is a component of the manufacturing apparatus for carrying out the method of manufacturing a glass article according to the embodiment of the present invention.
Fig. 18 is a longitudinal sectional front view taken along line D-D of fig. 17.
Fig. 19 is a perspective view showing a glass plate according to an embodiment of the present invention.
Detailed Description
Hereinafter, a method for manufacturing a glass article, a manufacturing apparatus, and a glass plate according to an embodiment of the present invention will be described with reference to the drawings.
[ method and apparatus for producing glass article ]
Fig. 1 illustrates a manufacturing apparatus of a glass article of the present invention. As shown in the figure, the manufacturing apparatus 1 includes, when roughly divided: a melting furnace 2 provided at an upstream end and heating and melting a glass raw material; a transfer device 3 that transfers the molten glass Gm flowing out of the melting furnace 2 toward the downstream side; and a forming mechanism 4 for forming the molten glass Gm supplied from the transfer device 3 into a strip-shaped plate-like glass Gp.
The transfer device 3 includes, as a transfer container, a clarification tank 5, an additional tank 6 attached to the clarification tank 5, a plurality of (two in the drawing) agitation tanks 7 and 8, a cooling pipe 9, and a tank 10 in this order from the upstream side. The transfer containers 5 to 10 are provided with an inflow port into which the molten glass Gm flows and an outflow port from which the molten glass Gm flows.
Specifically, the fining tank 5 is used to remove bubbles from the molten glass, and an additional tank 6 is connected to the downstream side of the fining tank 5. An upstream first stirring vessel 7 and a downstream second stirring vessel 8 for homogenizing the molten glass Gm are disposed downstream of the additional tank 6. Stirring blades (stirrers) 7x and 8x rotating around the axis are housed in the respective stirring tanks 7 and 8 during operation of the manufacturing apparatus 1. A cooling pipe 9 is disposed adjacent to the downstream side of the second stirring vessel 8, and a vessel 10, which is a volume portion mainly for adjusting the viscosity of the molten glass Gm, is disposed adjacent to the downstream side of the cooling pipe 9. The downstream side of the cooling pipe 9 is inclined upward.
The forming mechanism 4 includes: a molded body 11 molded by causing the molten glass Gm to flow down by an overflow down-draw method; and a large-diameter introduction pipe 12 for guiding the molten glass Gm to the molding body 11. Molten glass Gm is supplied from the kettle 10 of the transfer device 3 to the inlet pipe 12.
Fig. 2 is an enlarged longitudinal sectional view of the transfer device 3. As shown in the figure, the outlet 2b of the melting furnace 2 communicates with the inlet 5a of the clarification tank 5 via the upstream side connection pipe 13. An exhaust port for discharging mainly gas generated from bubbles in the molten glass is provided in the upper surface portion 5n of the fining vessel 5, and illustration thereof is omitted. The outlet 5b of the clarification tank 5 is overlapped with and communicated with the inlet 6a of the additional tank 6. The outlet 6b of the additional tank 6 communicates with the inlet 7a of the first stirring tank 7 via the intermediate connection pipe 14. The inlet 7a of the first stirring tank 7 is provided at the upper part of the peripheral wall of the first stirring tank 7. The outlet 7b of the first stirred tank 7 communicates with the inlet 8a of the second stirred tank 8 via the downstream side connecting pipe 15. The outlet 7b of the first stirred tank 7 is provided at the lower part of the peripheral wall of the first stirred tank 7, and the inlet 8a of the second stirred tank 8 is provided at the upper part of the peripheral wall of the second stirred tank 8. These stirred tanks 7 and 8 are arranged at the same height. The downstream side of the downstream side connection pipe 15 is inclined upward. The outlet 8b of the second stirring vessel 8 coincides with and communicates with the inlet 9a of the cooling pipe 9. The outlet 8b of the second stirred tank 8 is provided at the lower part of the peripheral wall of the second stirred tank 8. The downstream side of the cooling pipe 9 is inclined upward. The outlet 9b of the cooling pipe 9 overlaps and communicates with the inlet 10a of the kettle 10. The tank 10 has an upper large diameter portion 10x and a lower small diameter portion 10 y. The inlet 10a of the reactor 10 is provided in the peripheral wall of the large-diameter portion 10x, and the outlet 10b is provided at the lower end of the small-diameter portion 10 y. The small diameter portion 10y of the reactor 10 is inserted into the inlet pipe 12 of the molding mechanism 4. The lower end of the small diameter portion 10y is immersed in the molten glass Gm in the introduction pipe 12.
At least the portion of the transfer flow path formed by the transfer containers 5 to 10 and the connecting pipes 13 to 15, which is in contact with the molten glass Gm (in this embodiment, the entire inner surface of the transfer flow path), is formed by a member formed of a thin noble metal (for example, platinum or a platinum alloy). The periphery of these members is covered with a refractory material outside the figure. The transfer flow path is heated by energization, and the temperature of each transfer container 5 to 10 and each connection pipe 13 to 15 can be adjusted.
The manufacturing apparatus 1 having the above configuration performs the following steps. That is, the method for producing a glass article of the present invention includes: a melting step of heating and melting a glass raw material in a melting furnace 2 to generate molten glass Gm; a transfer step of transferring the molten glass Gm flowing out of the melting furnace 2 to the forming mechanism 4 by the transfer device 3; and a forming step of forming the molten glass Gm supplied from the transfer device 3 into a predetermined shape by the forming mechanism 4. The manufacturing method further includes an introduction step of introducing the molten glass Gm flowing out of the melting furnace 2 into the transfer device 3 before the transfer step and the molding step are started (at the time of starting before the start of the operation). In this introduction step, the following is performed.
Fig. 3 and 4 illustrate a state in which the molten glass Gm is not discharged from the melting furnace 2 to the transfer device 3 before the start of the transfer step and the molten glass Gm is not present in the transfer device 3. As shown in the above figures, a shutter 16 as a stopper member is inserted into the additional groove 6. The gate 16 functions to block the flow of the molten glass Gm. In this case, the gap 17 between the bottom surface portion 16m of the gate 16 and the lower surface portion 6m of the additional tank 6 is a passage (narrowed passage) through which the molten glass Gm flows. The gate 16 is moved up and down by an elevating mechanism not shown in the figure, so as to open and close the additional tank 6 and adjust the opening degree of the additional tank 6. This enables the gate 16 to adjust the flow rate of the molten glass Gm. A thin plate 18 made of platinum or a platinum alloy is adhered to the front surface 16a, the back surface 16b, the side surface 16c, and the bottom surface 16m of the refractory forming the shutter 16. The shutter 16 is formed in a U shape from the side surface portions 16c to the bottom surface portion 16 m.
The clearing sump 5 is formed in a tubular shape. The additional tank 6 is formed in a pipe shape, but only a portion into which the shutter 16 is inserted is formed in a U shape as shown in fig. 4. The flow path area of the clarifying tank 5 is larger than that of the additional tank 6, and the flow path area of the additional tank 6 is larger than that of the intermediate connection pipe 14. Specifically, the lowest part of the lower surface portion 5m of the clarification tank 5, the lowest part of the lower surface portion 6m of the additional tank 6, and the lowest part of the lower surface portion 14m of the intermediate connection pipe 14 are located at the same height position. The uppermost portion of the upper surface portion 5n of the clarification tank 5 is higher than the uppermost portion of the upper surface portion 6n of the additional tank 6, and the uppermost portion of the upper surface portion 6n of the additional tank 6 is higher than the uppermost portion of the upper surface portion 14n of the intermediate connection pipe 14.
In the introduction step of this embodiment, first, a temperature raising step of raising the temperature of each of the transfer containers 5 to 10 and the connection pipes 13 to 15, which are the constituent elements of the transfer device 3, and a connection step of connecting the transfer containers 5 to 10, which have undergone the temperature raising step, to the connection pipes 13 to 15 and connecting the melting furnace 2 to the transfer device 3 are performed. Thereafter, the molten glass Gm is discharged from the melting furnace 2 toward the downstream side and introduced into the transfer device 3.
Fig. 5 illustrates a state in which the molten glass Gm flowing out of the melting furnace 2 is introduced into the clarifier 5 and then is poured into and discharged from the first stirring tank 7 (first pouring step). In this state, the stirring blade 7x is removed from the first stirring tank 7 (the same applies to the stirring blade 8x of the second stirring tank 8).
In the initial stage, the molten glass Gm flowing out of the melting furnace 2 flows into the fining vessel 5 through the upstream connecting pipe 13. Immediately after the inflow, the molten glass Gm in the clarifier 5 is in a low level state. Therefore, the molten glass Gm flows into the additional tank 6 through the periphery of the lower surface portion 6m of the clarifying tank 5. The molten glass Gm flowing into the additional tank 6 is blocked by the gate 16 against the flow. As a result, the molten glass Gm is stored on the upstream side of the gate 16. Then, as shown in fig. 5, the inside of the vessel 5 is filled with the molten glass Gm in a short time (maintaining step).
Since the molten glass Gm has the highest temperature in the clarifying tank 5 of the transfer device 3 when the transfer step and the forming step are performed, the molten glass Gm also needs to have the highest temperature in the clarifying tank 5 in the introduction step before the start of the transfer step. In the introduction step, the temperature of the molten glass Gm in the fining vessel 5 is, for example, 1500 to 1650 ℃. Therefore, the clarifier 5 is most likely to be oxidized in the transfer device 3. However, after the inflow of the molten glass Gm into the clarifier 5 is started, the clarifier 5 is filled with the molten glass Gm in a short time. Therefore, oxidation of the clarifier 5 can be suppressed. As a result, it is possible to avoid mixing of foreign matter such as platinum into the molten glass Gm in the fining vessel 5. The portion of the additional tank 6 on the upstream side of the gate 16 is also filled with the molten glass Gm in the same manner.
The molten glass Gm having passed through the gate 16 flows into the first stirring vessel 7 through the downstream side portion of the additional tank 6 and the intermediate connection pipe 14. The molten glass Gm is discharged downward through a drain hole 7g opened in the inner bottom surface 7m of the first stirring vessel 7. The molten glass Gm at this time is maintained at a low liquid level (a liquid level lower than that during operation) at the downstream side of the additional tank 6, the intermediate connection pipe 14, and the first stirring tank 7. In the introduction step, the temperature of the molten glass Gm in the intermediate connection pipe 14 and the first stirring vessel 7 is, for example, 1200 to 1400 ℃. Therefore, the intermediate connection pipe 14 and the first stirring tank 7 are less likely to be oxidized than the clarifying tank 5, and therefore, foreign matter such as platinum is less likely to be mixed therein, and even if it is slightly generated.
In this introduction step (maintenance step), the molten glass Gm is continuously discharged from the first stirring vessel 7, and the molten glass Gm constantly flows in the clarifier 5. Thus, the molten glass Gm is retained in the fining vessel 5 for a long period of time and is in a boiled-dry state (a state of being mixed and boiled), and the heterogeneous glass is less likely to be altered.
In this introduction step (maintaining step), while the flow of the molten glass Gm is blocked by the shutter 16, the temperature of the molten glass Gm in the fining vessel 5 is lower by, for example, 50 to 200 ℃. This reduces the flow rate of the molten glass Gm, and can reduce the flow rate of the molten glass Gm per unit time flowing out of the clarifier 5.
In this embodiment, during the maintenance step, a centering step of centering the molded body 11 with a rough cutting machine (a device for cutting glass) disposed below the rough cutting machine is performed. This centering step requires, for example, 3 to 6 hours. During the centering step, as shown in fig. 5, the molten glass Gm is continuously discharged from the drain hole 7g of the first stirring vessel 7 while the clarifying tank 5 is filled with the molten glass Gm. Therefore, during the centering step, it is possible to avoid mixing of foreign matter such as platinum into the molten glass Gm in the fining vessel 5. In addition, the molten glass Gm can be prevented from being boiled to dryness and deteriorated in quality in the clarifier 5.
Thereafter, as shown in fig. 2, the gate 16 is removed from the auxiliary tank 6, and the drain hole 7g of the first stirring vessel 7 is closed to stop the discharge of the molten glass Gm from the drain hole 7 g. In addition, the transfer containers 5 to 10 and the connecting pipes 13 to 15 are heated to the operating temperature. Thereby, the molten glass Gm flows into the forming mechanism 4 through the second stirring vessel 8, the cooling pipe 9, and the vessel 10, and the liquid level of the molten glass Gm becomes the height of the liquid surface when the operations are performed in the transfer vessels 6 to 10 and the connecting pipes 14 and 15 (second inflow step). Thereafter, the transfer step and the forming step (operation) are started.
Next, the structure of the portion of the additional tank 6 where the shutter 16 is disposed will be described in detail. As shown in fig. 6, a rectangular square tubular portion 19 having a central axis extending in the vertical direction is attached to an upper portion of the peripheral wall 6A forming the additional tank 6. An opening 20 for inserting and removing the shutter 16 is provided at an upper end of the cylindrical portion 19. When the shutter 16 is removed (when the transfer step and the molding step are performed), the opening 20 is covered with the cover.
First to fifth examples of the upper portion of the cylindrical portion 19 of the additional tank 6 will be described below with reference to the drawings.
[ first example ]
Fig. 7 is a perspective view of a main portion showing a first example of the upper structure of the cylindrical portion 19, and fig. 8 is a longitudinal front view cut along line B-B of fig. 7. As shown in the above figures, the opening 20 at the upper end of the cylindrical portion 19 is covered with the lid 21. As described in detail, the cylindrical portion 19 has a flange 22 at an upper end. The lid body 21 can be easily attached and detached in a state of covering the opening portion 20. The cylindrical portion 19 is formed of platinum or a platinum alloy. The flange 22 is formed from platinum or a platinum alloy or other metal. Here, in the example shown in the figure, the opening area of the opening 20 of the cylindrical portion 19 is substantially the same as the pipe passage area of the cylindrical portion 19, but the former may be smaller or larger than the latter.
Fig. 9 is a perspective view showing the structure of the cover 21. As shown in the drawing, the lid body 21 is composed of a plurality of (two in the drawing) refractories 24 and a thin plate 25 as a covering material made of platinum or a platinum alloy covering the refractories 24. The sheet 25 includes a lower sheet 25a covering the lower surfaces of the two refractories 24, an outer peripheral sheet 25b covering the entire outer peripheral surfaces of the two refractories 24, and a partition sheet 25c interposed between the two refractories 24. The thin plates 25a, 25b, and 25c are integrated. As shown in fig. 10, the following configuration may be adopted: the two refractory materials 24 are separately covered with the lower thin plate 25a, the outer peripheral thin plate 25b, and the partition thin plate 25c, and the two partition thin plates 25c are separably joined to each other or separably joined to each other. The sheet 25 may cover the entire surface of the refractory 24 including the upper surface, or may cover only the lower surface of the refractory 24. The coating material is not limited to the thin plate 25, and may be a layer made of platinum or a platinum alloy formed on the refractory 24 by thermal spraying. Here, the refractory 24 is, for example, a refractory made of dense zircon, mullite, alumina, zirconia or the like (hereinafter, the same applies to the "refractory").
According to the configuration of the first example, the following operational effects are exhibited. While the transfer step and the molding step are being performed, the opening 20 of the cylindrical portion 19 of the additional tank 6 is covered with the lid body 21. Therefore, the disadvantage that may occur due to the opening of the opening 20 is avoided. Specifically, even if the tin oxide or the like remaining in the molten glass Gm in the additional tank 6 volatilizes, the vicinity of the opening 20 of the cylindrical portion 19 is constantly maintained at a high temperature, and therefore, the volatile matter can be prevented from liquefying or solidifying and adhering to the inner surface in the vicinity of the opening 20. Therefore, the adhered volatile matter can be appropriately prevented from falling into the molten glass Gm and becoming foreign matter. Further, since the amount of heat radiated from the opening 20 is greatly reduced, the effect of preventing devitrification in the vicinity of the liquid surface GL of the molten glass Gm is also obtained. As a result, the quality of the glass article (glass sheet) as a product can be improved and the yield of the product can be improved.
Further, since the lower surface of the lid body 21, which is a portion that is easily etched, is covered with the thin plate (covering material) 25 made of platinum or a platinum alloy, etching of the lid body 21 and the like can be effectively suppressed, and durability can be improved. In this case, when the entire lid body 21 is formed of platinum or a platinum alloy, the cost increases and the weight increases, but by covering the refractory 24 with the thin plate 25 made of platinum or a platinum alloy, cost reduction and weight reduction can be facilitated.
In the configuration of the first example, as exaggeratedly shown in fig. 11, the internal gas may flow out through the gap 26 between the upper end of the cylindrical portion 19 and the lid body 21. The gas is mainly vapor obtained by vaporization of the molten glass Gm, and includes gas generated from bubbles in the molten glass Gm. When the gas flows out through the gap 26 as indicated by the arrow a, there is a possibility that the following disadvantages will occur. The periphery of the cylindrical portion 19 has a structure as shown in fig. 12 in a strict sense. As shown in the drawing, a peripheral wall flange 27 extending from the peripheral wall 6A to the outer peripheral side is formed on the upstream side of the cylindrical portion 19, and an electrode (not shown) for electrically heating the peripheral wall 6A is attached to the peripheral wall flange 27. Further, a cooling pipe 28 for circulating a cooling liquid inside is attached to the peripheral wall flange 27. Between the cylindrical portion 19 and the peripheral wall flange 27, a refractory heat insulating brick 29 is disposed so as to cover the outer peripheral side of the peripheral wall 6A. Similarly, the peripheral wall flange 30, the cooling pipe 31, and the heat insulating bricks 32 are disposed on the downstream side of the cylindrical portion 19, and other heat insulating bricks 33 are disposed on the outer peripheral side of the heat insulating bricks 32. In this case, the upstream peripheral wall flange 27 is closer to the cylindrical portion 19 than the downstream peripheral wall flange 30. Therefore, as described above, the gas flowing out in the direction of arrow a from the gap 26 between the upper end of the cylindrical portion 19 and the lid body 21 may attack the upstream-side heat insulating bricks 29 and contact the upstream-side cooling pipe 28. When this occurs, the gas has a high temperature, and therefore the cooling pipe 28 on the upstream side may be corroded by oxidation or the like, and the coolant may leak. When the gas flowing out of the gap 26 attacks the downstream side heat insulating bricks 32 and 33 in a large amount, the cooling pipe 31 on the downstream side may leak the coolant due to corrosion or the like in the same manner.
[ second example ]
The second example is to avoid such a bad situation. Fig. 13 is a perspective view showing a second example of the upper structure of the cylindrical portion 19, and fig. 14 is a longitudinal front view taken along the line C-C of fig. 13. As shown in the above figures, the lid body 21 is provided with an exhaust flow path 40. As described in detail, the lid 21 includes: a rectangular flat plate-like base wall portion 41 that covers the opening portion 20 of the cylindrical portion 19; a rectangular frame-shaped or rectangular square tube-shaped side wall portion 42 provided above the base wall portion 41; and a top wall portion 43 of a rectangular flat plate shape covering an upper side of the side wall portion 42. The exhaust passage 40 is composed of an inlet 44, an internal space 45 communicating with the inlet, and an outlet 46 communicating with the internal space 45. The inlet 44 is a through hole formed in the center of the base wall 41. The internal space 45 is a space surrounded by the side wall portion 42 and the top wall portion 43. The outlet 46 is a cutout formed in an upper portion of one portion around the side wall 42. In this case, the inlet 44 and the outlet 46 are different in position in a plan view. The central axis of the inlet 44 is along the vertical direction, while the central axis of the outlet 46 is along the horizontal direction. Therefore, the flow direction of the gas at the inlet 44 is an upward direction (arrow c direction) substantially along the vertical direction, whereas the flow direction of the gas at the outlet 46 is a lateral direction (arrow d direction) substantially along the horizontal direction.
Here, the base wall portion 41 is formed with a flow inlet 44 at the center portion of the lid body 21 (see fig. 9 and 10) in the first example described above. In this case, the inner peripheral surface of the inlet 44 is also covered with a coating material of platinum or a platinum alloy. Further, it is preferable that both the side wall portion 42 and the top wall portion 43 are formed of only refractory, but at least a portion of the refractory which comes into contact with the gas may be covered with a coating material of platinum or a platinum alloy. The opening area of the outlet 46 is smaller than the opening area of the inlet 44. The outflow port 46 is not limited to one portion around the side wall portion 42, and may be formed in a plurality of portions around the side wall portion.
According to the configuration of the second example, the following operational effects are exhibited. The gas in the additional tank 6 flows into the internal space 45 from the inlet 44 of the exhaust passage 40 prior to flowing out to the outside from the outlet 46, in preference to the gap 26. Therefore, the amount of gas flowing out of the gap 26 is very small. Since the flow direction (d direction) of the gas at the outlet 46 is orthogonal to the upstream and downstream directions, the gas flowing out of the outlet 46 does not flow in the direction of either the upstream cooling tube 28 or the downstream cooling tube 31. Due to these reasons, the gas can be prevented from contacting the cooling pipes 28 and 31.
In this case, since the inner peripheral surface of the outlet 46 is affected by the outside air and the temperature thereof is lowered, volatile substances such as tin oxide contained in the gas are easily liquefied or solidified and adhere to the inner peripheral surface thereof. When the volatile matter adheres to the inner peripheral surface of the outflow port 46, the volatile matter may fall over time. However, since the positions of the inlet 44 and the outlet 46 in plan view and the flow direction of the gas are different, the inlet 44 is not present in the path of the volatile falling, and the volatile is held by the bottom of the inner peripheral surface of the outlet 46 and the upper surface of the base wall 41. Therefore, the falling of the volatile matter into the molten glass Gm is prevented. The inner peripheral surface of the inlet 44 is kept at a high temperature because it is less susceptible to the influence of the outside air. Therefore, it is possible to prevent volatile matter such as tin oxide from adhering to the inner peripheral surface of the inlet 44.
[ third example ]
Fig. 15 is a vertical sectional front view showing a third example of the upper structure of the cylindrical portion 19. As shown in the drawing, the third example differs from the second example in that a receiving member 47 is provided on the base wall portion 41 of the lid body 21. The receiving member 47 has: a hanging portion 47a extending downward from a lower portion of the base wall portion 41; and a catch portion 47b extending in the lateral direction (horizontal direction) from the lower end of the hanging portion 47 a. The stopper 47b is disposed in the upper space of the liquid surface GL of the molten glass Gm. The area (area in plan view) of the receiving portion 47b is larger than the opening area of the inflow port 44, and the inflow port 44 is accommodated in the upper surface area of the receiving portion 47b in plan view. Since the other configurations are the same as those of the second example described above, the same reference numerals are given to the components common to both examples in fig. 15, and the description thereof is omitted. According to the configuration of the third example, even if the volatile matter adhering to the inner peripheral surface of the inflow port 44 falls through the inflow port 44 due to a large amount or the like, the volatile matter is received by the receiving portion 47b of the receiving member 47. Therefore, it is possible to more reliably prevent the volatile matter from falling into the molten glass Gm and becoming foreign platinum matter or the like. The operation and effects other than this are substantially the same as those of the second example described above.
[ fourth example ]
Fig. 16 is a vertical sectional front view showing a fourth example of the upper structure of the cylindrical portion 19. As shown in the drawing, the configuration of the fourth example is different from the configuration of the second example described above in that an inlet 44 is formed at a position offset to one side from the center portion of the base wall portion 41 of the lid body 21, and an outlet 46 is formed at a position offset to the other side from the center portion of the top wall portion 43. Therefore, the inflow port 44 and the outflow port 46 are different in position in a plan view. In this case, the flow direction of the gas at the inlet 44 is the same as the flow direction of the gas at the outlet 46, and both directions are upward directions (the arrow e direction and the arrow f direction) along the vertical line. The side wall portion 42 is not formed with a notch. Further, the internal space 45 of the exhaust gas flow path 40 is laterally wider than in the second example described above. Since the other configurations are the same as those of the second example described above, the same reference numerals are given to the components common to both examples in fig. 16, and the description thereof will be omitted. According to the configuration of the fourth example, since the inlet 44 and the outlet 46 are different in position in plan view, the inlet 44 is not present in the path of the volatile falling, and the volatile is retained by the upper surface of the base wall portion 41. Therefore, the falling of the volatile matter into the molten glass Gm is prevented. Further, since the gas flowing out of the outlet 46 is directed upward (in the direction of arrow f) immediately after flowing out, the gas can be reliably prevented from contacting the cooling pipes 28 and 31.
[ fifth example ]
Fig. 17 is a vertical front view showing a fifth example of the upper structure of the cylindrical portion 19, and fig. 18 is a vertical front view taken along the line D-D of fig. 17. In the fifth example configuration, the lid 21 includes: a rectangular frame-shaped or rectangular tubular side wall portion 42 disposed above the flange 22; and a top wall portion 43 of a rectangular flat plate shape covering an upper side of the side wall portion 42. The top wall portion 43 has the same structure as the lid body 21 (see fig. 9 and 10) in the first example described above. The exhaust passage 40 is composed of an internal space 45 and an outlet 46. The internal space 45 is a space surrounded by the side wall portion 42 and the top wall portion 43. The outlet 46 is a cutout formed in an upper portion of one portion around the side wall 42. According to the fifth example configuration, the gas in the additional tank 6 flows out from the outlet 46 to the outside through the internal space 45 of the exhaust flow path 40 in preference to the gap 26 between the upper end of the cylindrical portion 19 and the side wall portion 42. In this case, even if the volatile matter adhering to the inner peripheral surface of the outlet 46 falls, the volatile matter is retained by the bottom portion of the inner peripheral surface of the outlet 46 and the upper end surface of the cylindrical portion 19 (the upper surface of the flange 22, etc.). Therefore, the falling of the volatile matter into the molten glass Gm is prevented. In this case, the space above the opening 20 (the internal space 45) is surrounded by the side wall portion 42 and the ceiling wall portion 43, and thus is maintained at a high temperature. Therefore, volatile substances such as tin oxide are less likely to adhere to the vicinity of the opening 20, and aggregation of the adhered volatile substances is also less likely to occur. This prevents the volatile matter from adhering to and condensing around the opening 20, and prevents the volatile matter from falling from the inner surface around the opening 20 into the molten glass Gm. The reason why the gas flowing out of the outlet 46 hardly contacts the cooling pipes 28 and 31 is substantially the same as that of the second example (see fig. 14).
Next, embodiments of the glass substrate of the present invention will be explained.
[ glass substrate ]
The present inventors obtained a plurality of glass substrates using the manufacturing apparatus and the manufacturing method having the above-described configurations. The present inventors have also paid attention to the form and amount of platinum foreign matter contained in these glass substrates, and have found a high-quality glass substrate Gpx as shown in fig. 19 among these glass substrates. In the high-quality glass substrate Gpx, the ratio of the major axis dimension to the minor axis dimension is 15 or more, and the number of platinum foreign matter having a major axis dimension of 3 μm or more is 1/kg or less. In this case, the number of platinum impurities is preferably 0.05 pieces/kg or less, and more preferably 0.01 pieces/kg or less. The lower limit of the number of platinum impurities may be, for example, 0.0001 or more per kg. As a result of the studies by the present inventors, when a plurality of glass substrates were obtained by using the conventional manufacturing apparatus and manufacturing method, the number of the platinum foreign matters contained in the glass substrates was about 3/kg even when the number of the platinum foreign matters contained in the glass substrates was high. On the other hand, when a plurality of glass substrates were obtained using the manufacturing apparatus and the manufacturing method of the present invention, the number of these glass substrates was 0.0005 pieces/kg if the number of the platinum foreign matters contained in the glass substrates was the most suitable.
The glass substrate can be used for flat panel displays such as liquid crystal displays and organic EL displays, organic EL lighting, solar cells, and the like. The thickness of the glass substrate is, for example, 0.01 to 10mm, preferably 0.1 to 3mm, more preferably 0.2 to 1.8mm, and still more preferably 0.2 to 0.5 mm. The glass substrate has a rectangular shape, and the length of the short side and the long side is preferably 1100mm or more, and more preferably 2200mm or more.
The glass substrate is made of, for example, alkali-free glass, soda-lime glass, borosilicate glass, aluminosilicate glass, or alkali-containing glass. When the glass substrate is made of alkali-free glass, for example, SiO can be contained in mass%2 50％～70％、Al2O3 12％～25％、B2O3 0％～12％、Li2O+Na2O+K2O(Li2O、Na2O and K2Total amount of O) more than 0% and less than 1%, MgO 0% -8%, CaO 0% -15%, SrO 0% -12%, BaO 0% -15%.
The glass substrate is preferably a glass substrate formed by the overflow down-draw method, in which the surfaces of both sides are forged surfaces.
The present invention is not limited to the above-described embodiments, and various modifications can be made as exemplified below.
In the above embodiment, the shutter 16 is disposed in the additional tank 6, but the position of the shutter 16 may be other positions as long as it is a flow path between the clarifier tank 5 and the first stirred tank 7.
In the above-described embodiment, the shutter 16 is used as the blocking member, but for example, a configuration may be adopted in which a vessel having an inlet on the peripheral wall and an outlet on the bottom wall is disposed between the clarifier tank 5 and the first stirrer 7, and a plunger for adjusting the outflow amount of the molten glass from the outlet is provided (this configuration is known per se), and the plunger is used as the blocking member.
In the above embodiment, the stopper member 16 blocks the flow of the molten glass Gm to fill the clarifier 5 with the molten glass Gm, but the liquid level of the molten glass Gm in the clarifier 5 may not be filled as long as the liquid level is equal to the liquid level during operation.
In the above embodiment, the two stirring tanks 7 and 8 are exemplified as the transfer container, but even in the case of 3 or more stirring tanks, the molten glass may be discharged only from the drain hole of the stirring tank located on the most upstream side. In the case of one stirring vessel, the molten glass may be discharged from a drain of the stirring vessel.
In the above embodiment, the description has been given of the start-up time before the start of the operation after the replacement of the conventional transfer device 3, but the start-up time may be after the replacement of the melting furnace 2 and the transfer device 3, the start-up time after the replacement of the transfer device 3 and the forming mechanism 4, or the start-up time after the replacement of the melting furnace 2, the transfer device 3, and the forming mechanism 4. Further, the melting furnace 2, the transfer device 3, and the forming mechanism 4 may be newly installed and then started up.
In the above embodiment, the forming mechanism 4 forms the strip-shaped plate glass Gp, but may be formed into another shape corresponding to the glass article.
In the above embodiment, the molten glass Gm is blocked by the blocking member 16 and stored in the fining vessel 5 in the introduction step (maintaining step) before the start of the transfer step, but the flow rate of the molten glass Gm in the transfer device 3 may be adjusted by using the blocking member 16 during the transfer step and the forming step. In other words, the transfer step may include a step of adjusting the flow rate of the transfer device 3 by the stopper member 16.
By adjusting the flow rate of the transfer device 3 using the dam member 16 disposed in the flow path 6 between the clarifier 5 and the stirred tank 7 as shown in fig. 3, the liquid level of the molten glass Gm in the clarifier 5 can be maintained before and after the flow rate adjustment. Therefore, the liquid level of the molten glass Gm in the clarifier 5 can be prevented from lowering and the oxidization of the molten glass Gm in the clarifier 5 can be prevented. Further, in order to adjust the flow rate of the transfer device 3, it is conceivable to dispose a dam member, for example, on the cooling pipe 9 on the downstream side of the stirring tank 7, but in this case, devitrification occurs at a three-phase interface formed by the dam member, the molten glass Gm, and air, and thus, streaks may occur in the glass ribbon Gr. On the other hand, if the flow rate of the transfer device 3 is adjusted by the dam member 16 disposed in the flow path 6 between the clarifier tank 5 and the stirred tank 7, the occurrence of streaks in the glass ribbon Gr can be prevented.
In the above embodiment, the lid body 21 covering the opening 20 of the cylindrical portion 19 provided at the upper portion of the additional tank 6 is rectangular in plan view, but may be oval, polygonal, or the like in plan view.
Description of the reference numerals
1 manufacturing apparatus
2 melting furnace
3 transfer device
4 shaping mechanism
5 clarifying tank
Flow path 6 (with groove)
6A peripheral wall
7 stirring kettle
7g bleeder
7m inner bottom surface
8 stirring kettle
9 Cooling tube
11 shaped body
16 Barrier (Gate)
Gm molten glass
19 cylindrical part
20 opening part
21 cover body
40 exhaust gas flow path
42 side wall part
43 top wall part
46 outflow opening
Gpx glass plate.
Claims (11)
1. A method of manufacturing a glass article, comprising: a melting step of heating and melting a glass raw material in a melting furnace to produce molten glass; a transfer step of transferring the molten glass flowing out of the melting furnace to a forming mechanism by a transfer device having a clarifying tank disposed downstream of the melting furnace and a stirring vessel disposed downstream of the clarifying tank; and a forming step of forming the molten glass supplied from the transfer device into a predetermined shape by the forming mechanism,
the method for manufacturing a glass article is characterized in that,
the method for producing a glass article further includes an introduction step of introducing the molten glass flowing out of the melting furnace into the transfer device before the transfer step and the molding step are started,
the introducing step includes a maintaining step of maintaining a liquid level of the molten glass in the clarifying tank at a liquid level during the transfer step and the forming step by blocking the molten glass by a blocking member disposed in a flow path between the clarifying tank and the stirring vessel.
2. The method for manufacturing a glass article according to claim 1,
the stopper member is a shutter for opening and closing the flow path, and the opening degree of the flow path is adjusted by the shutter, thereby maintaining the liquid level of the molten glass in the clarifier at the liquid level during the execution of the transfer step and the forming step.
3. The method for manufacturing a glass article according to claim 1 or 2,
in the maintaining step, the molten glass in the clarifying tank is transferred to the stirring tank and discharged from a drain hole opened in an inner bottom surface of the stirring tank.
4. The method for producing a glass article according to any one of claims 1 to 3,
the clarifying tank in the maintaining step is filled with molten glass in the same manner as the clarifying tank in the transferring step during the execution of the forming step.
5. The method for producing a glass article according to any one of claims 1 to 4,
the temperature of the molten glass in the fining tank in the maintaining step is lower than the temperature of the molten glass in the fining tank in the transferring step during the forming step.
6. An apparatus for manufacturing a glass article, comprising: a melting furnace that heats and melts a glass raw material to produce molten glass; a transfer device which has a clarification tank disposed downstream of the melting furnace and a stirring vessel disposed downstream of the clarification tank, and transfers the molten glass flowing out of the melting furnace; and a forming mechanism for forming the molten glass supplied from the transfer device into a predetermined shape,
the manufacturing apparatus of the glass article is characterized in that,
the glass article manufacturing apparatus further includes a blocking member in a flow path between the clarifier and the stirrer, in order to block the molten glass flowing out of the melting furnace.
7. The glass article manufacturing apparatus according to claim 6,
the blocking member is a shutter for opening and closing the flow path.
8. The glass article manufacturing apparatus according to claim 7,
the shutter can be inserted and removed through an opening provided in an upper portion of a peripheral wall forming the flow path,
the glass article manufacturing apparatus is configured such that the cover covers the opening when the shutter is removed.
9. The glass article manufacturing apparatus according to claim 8,
the cover body has an exhaust passage for discharging the gas present in the passage.
10. The glass article manufacturing apparatus according to claim 9,
the lid body has a side wall portion surrounding a space above the opening portion from an outer peripheral side, and a top wall portion covering an upper side of the side wall portion, and the outlet of the exhaust gas flow path is provided in the side wall portion.
11. A glass substrate characterized in that a glass substrate,
the ratio of the major axis dimension to the minor axis dimension is 15 or more, and the number of platinum foreign matters having a major axis dimension of 3 μm or more is 1/kg or less.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| JP2018127549 | 2018-07-04 | ||
| JP2018-127549 | 2018-07-04 | ||
| PCT/JP2019/026441 WO2020009143A1 (en) | 2018-07-04 | 2019-07-03 | Method and device for manufacturing glass article, and glass substrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112119043A true CN112119043A (en) | 2020-12-22 |
| CN112119043B CN112119043B (en) | 2023-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980032086.7A Active CN112119043B (en) | 2018-07-04 | 2019-07-03 | Method and apparatus for manufacturing glass article |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP7223345B2 (en) |
| KR (1) | KR20210030252A (en) |
| CN (1) | CN112119043B (en) |
| WO (1) | WO2020009143A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113830996A (en) * | 2021-09-30 | 2021-12-24 | 张占恒 | Glass raw material pretreatment process |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230250006A1 (en) * | 2020-08-12 | 2023-08-10 | Corning Incorporated | Method for forming a glass article |
| JPWO2022270555A1 (en) * | 2021-06-25 | 2022-12-29 | ||
| JP2023084387A (en) * | 2021-12-07 | 2023-06-19 | 日本電気硝子株式会社 | Glass transfer device, device for manufacturing glass article and method for manufacturing glass article |
| WO2023234083A1 (en) * | 2022-06-03 | 2023-12-07 | 日本電気硝子株式会社 | Glass article manufacturing apparatus and glass article manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113830996A (en) * | 2021-09-30 | 2021-12-24 | 张占恒 | Glass raw material pretreatment process |
Also Published As
| Publication number | Publication date |
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| KR20210030252A (en) | 2021-03-17 |
| JP7223345B2 (en) | 2023-02-16 |
| WO2020009143A1 (en) | 2020-01-09 |
| CN112119043B (en) | 2023-04-14 |
| JPWO2020009143A1 (en) | 2021-07-08 |
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