Apparatus for manufacturing glass article and method for manufacturing the same

Abstract

To reliably prevent glass from clogging in a transfer pipe.SOLUTION: An apparatus 1 for manufacturing a glass article includes: a first cooling pipe 10 for transferring molten glass Gm; a holding brick 14 arranged on an outer peripheral side of the first cooling pipe 10 to hold the first cooling pipe 10; and a heating device 18 arranged on an outer side of the holding brick 14 to heat the first cooling pipe 10 via the holding brick 14.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an apparatus and method for manufacturing a glass article. [Background technology]

[0002] 2. Description of the Related Art When manufacturing glass articles such as glass sheets and glass tubes, molten glass is transferred from a melting furnace to a forming device by a transfer device. A transfer pipe is disposed in a transfer path of the molten glass in the transfer device.

[0003] Patent Document 1 (see Figure 4 of the document) discloses a specific example of peripheral equipment for a transfer pipe. This equipment is configured by surrounding the outer periphery of the transfer pipe with retaining bricks (electroformed bricks) and arranging a casing (outer enclosure) on the outer periphery of the retaining bricks with a space in between. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-88754 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the temperature of the molten glass in the transfer pipe decreases, the fluidity of the molten glass decreases. If the fluidity of the molten glass decreases significantly, glass clogging may occur in the transfer pipe, which may cause problems in the transfer of the molten glass using the transfer pipe. Therefore, it is necessary to properly manage the temperature of the molten glass in the transfer pipe, but there is still room for improvement in the peripheral equipment of the conventional transfer pipe in terms of suppressing glass clogging in the transfer pipe.

[0006] An object of the present invention is to reliably prevent glass clogging from occurring in a transfer pipe. [Means for solving the problem]

[0007] (1) The present invention, which was invented to solve the above problems, is a glass product manufacturing apparatus comprising a transfer pipe for transporting molten glass and a retaining brick arranged on the outer periphery of the transfer pipe to hold the transfer pipe, and is characterized in that it also comprises a heating device arranged on the outside of the retaining brick for heating the transfer pipe via the retaining brick.

[0008] In this way, the molten glass in the transfer pipe can also be heated by the heating device through the retaining bricks. Therefore, glass clogging in the transfer pipe can be reliably suppressed. In addition, since the heating device is disposed outside the retaining bricks, there is an advantage that the heating device can be easily arranged and maintained. In other words, when the heating device is arranged inside the retaining bricks or embedded inside the retaining bricks, there is a disadvantage that complicated work is required for the arrangement and maintenance of the heating device.

[0009] (2) In the above configuration (1), it is preferable to have a casing in which the transfer pipe and the retaining bricks are housed with a space between the transfer pipe and the retaining bricks, and the heating device heats the atmosphere within the casing.

[0010] In this way, the entire transfer tube can be heated uniformly.

[0011] (3) In the above configuration (1) or (2), the heating device is preferably a burner.

[0012] In this way, the combustion gas circulates within the casing, heating the entire atmosphere within the casing, thereby increasing the degree of freedom in selecting the location for installing the heating device.

[0013] (4) In the above configuration (3), it is preferable that the burner forms a flame in a lower portion inside the casing.

[0014] In this way, the atmosphere heated in the lower part of the casing rises to the upper part of the casing, so that the inside of the casing is heated uniformly. Therefore, the entire transfer pipe can be heated more uniformly, and the molten glass in the transfer pipe can be heated efficiently.

[0015] (5) In any of the above configurations (2) to (4), the wall of the casing is preferably made of a refractory material.

[0016] This improves the heat resistance of the casing, making it easier to heat the inside of the casing to a high temperature.

[0017] (6) In any one of the above configurations (1) to (5), the retaining bricks are preferably made of electrocast bricks.

[0018] This improves the thermal conductivity of the retaining bricks, facilitating the transfer of heat to the transfer pipe.

[0019] (7) In the above configurations (1) to (6), a cooling device may be provided that is disposed outside the retaining bricks and cools the transfer pipe via the retaining bricks.

[0020] In this way, even if the temperature of the molten glass in the transfer pipe is too high, the temperature of the molten glass in the transfer pipe can be appropriately controlled.

[0021] (8) The present invention, which has been invented to solve the above problems, is a method for manufacturing a glass article, including a production process for producing a glass article from molten glass using a glass article manufacturing apparatus having a transfer tube for transporting molten glass and a retaining brick arranged on the outer periphery of the transfer tube and holding the transfer tube, and is characterized in that, as a pre-process of the production process, the method includes a raising process for increasing the depth of the molten glass in the transfer tube, and in the raising process, a heating device is arranged on the outside of the retaining brick, and the transfer tube is heated by the heating device via the retaining brick.

[0022] At the beginning of the start-up process, the flow rate of molten glass in the transfer pipe is low compared to during the production process, and the temperature of the molten glass in the transfer pipe is likely to drop. Therefore, in the start-up process, it is preferable to heat the transfer pipe via the retaining bricks using a heating device. In this way, the molten glass in the transfer pipe can also be heated, so that glass clogging in the transfer pipe can be reliably suppressed. In addition, since the heating device is disposed outside the retaining bricks, there is also the advantage that the heating device can be easily disposed and maintained.

[0023] (9) The present invention, which has been invented to solve the above problems, is a method for manufacturing a glass article, including a production process of producing a glass article from molten glass using a glass article manufacturing apparatus having a transfer tube for transporting molten glass and a retaining brick arranged on the outer periphery of the transfer tube and holding the transfer tube, characterized in that, in the event of a power outage during the production process, a heating device is arranged on the outside of the retaining brick, and the transfer tube is heated via the retaining brick by the heating device.

[0024] When a power outage occurs during the production process, the temperature of the molten glass in the transfer pipe is likely to drop. Therefore, during a power outage, it is preferable to heat the transfer pipe via the retaining bricks using a heating device. In this way, the molten glass in the transfer pipe can also be heated, so that glass clogging in the transfer pipe can be reliably suppressed. In addition, since the heating device is disposed outside the retaining bricks, there is also the advantage that the heating device can be easily disposed and maintained. Effect of the Invention

[0025] According to the present invention, glass clogging in the transfer pipe can be reliably prevented. [Brief description of the drawings]

[0026] [Figure 1] 1 is a side view showing a glass article manufacturing apparatus according to a first embodiment of the present invention. [Diagram 2] 2 is a vertical cross-sectional view of peripheral equipment of a first cooling pipe included in the manufacturing apparatus of FIG. 1 (when a heating device and a cooling device are not in operation). FIG. [Diagram 3] FIG. 1 is a flow diagram of a method for manufacturing a glass article according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a vertical cross-sectional view of the peripheral equipment of the first cooling pipe included in the manufacturing apparatus of FIG. 1, showing a state during a start-up process (a state in which a heating device is operating). [Diagram 5] FIG. 2 is a vertical cross-sectional view of the peripheral equipment of the first cooling pipe included in the manufacturing apparatus of FIG. 1, showing the state during the production process (the cooling device is in operation). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, the embodiments for carrying out the present invention will be described with reference to the drawings. In addition, by assigning the same reference numerals to corresponding components in each embodiment, duplicated descriptions may be omitted. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other parts of the configuration. In addition to the combination of the configurations clearly stated in the description of each embodiment, the configurations of multiple embodiments can be partially combined together even if not clearly stated, as long as there is no particular problem with the combination.

[0028] First embodiment Fig. 1 illustrates an example of a manufacturing apparatus for a glass article according to a first embodiment. As shown in the figure, the manufacturing apparatus 1 includes a melting furnace 2 disposed at an upstream end for heating glass raw material Gr to produce molten glass Gm, a transfer device 3 for transferring the molten glass Gm flowing out of the melting furnace 2 toward the downstream side, and a forming device 4 for forming a glass tube as a glass article from the molten glass Gm supplied from the transfer device 3.

[0029] The melting furnace 2 has an inlet 2a through which the glass raw material Gr can be charged, and an outlet 2b through which the molten glass Gm produced by heating the glass raw material Gr charged into the furnace from the inlet 2a flows out to the next process.

[0030] The inlet 2a of the melting furnace 2 is provided with a charging device 5 for charging the frit Gr into the melting furnace 2. The charging device 5 includes a raw material hopper 6 in which the frit Gr is stored, and a conveyor 7 for conveying the frit Gr discharged from the lower end of the raw material hopper 6 to the melting furnace 2. The charging device 5 is not limited thereto, and may be another charging device such as a screw feeder.

[0031] In the melting furnace 2, a heating part for heating the glass raw material Gr and / or the molten glass Gm introduced into the melting furnace 2 is provided, although not shown. As the heating part, a burner, an electrode, or the like is used. The burner, for example, burns a fuel above the liquid surface of the molten glass Gm to form a flame and heat a target area. The electrode, for example, is immersed in the molten glass Gm and electrically heats the target area. The heating part may be only a burner or only an electrode. Alternatively, the heating part may be a combination of a burner and an electrode.

[0032] The transfer device 3 includes, in order from the upstream side, a throat 8, a fining vessel 9, a first cooling pipe 10, and a second cooling pipe 11.

[0033] The throat 8 is a transfer passage that connects the outlet 2b of the melting furnace 2 and the inlet 9a of the fining vat 9. The molten glass Gm produced in the melting furnace 2 is supplied to the fining vat 9 via the throat 8.

[0034] The fining tank 9 performs fining treatment on the molten glass Gm produced in the melting furnace 2. Although not shown, the fining tank 9 is provided with a heating part for heating the molten glass Gm. As the heating part, a burner, an electrode, or the like is used.

[0035] The first cooling pipe 10 and the second cooling pipe 11 cool the molten glass Gm and adjust the viscosity, flow rate, etc. of the molten glass Gm to a state suitable for forming. The first cooling pipe 10 and the second cooling pipe 11 are formed of, for example, platinum, a platinum alloy, reinforced platinum, a reinforced platinum alloy, or the like.

[0036] The upstream end 10a of the first cooling pipe 10 is inserted into the inside of the fining tank 9 from the outlet 9b of the fining tank 9. The downstream end 10b of the first cooling pipe 10 is connected to the upstream end 11a of the second cooling pipe 11 outside the fining tank 9. The molten glass Gm that has been fined in the fining tank 9 is transported inside the first cooling pipe 10 and the second cooling pipe 11, and then supplied to the forming device 4 from the downstream end 11b of the second cooling pipe 11. In this embodiment, of the first cooling pipe 10 and the second cooling pipe 11, only the second cooling pipe 11 can be electrically heated. In other words, although not shown, the first cooling pipe 10 does not include a facility for electrically heating, and the second cooling pipe 11 includes a facility for electrically heating. As a facility for electrically heating the second cooling pipe 11, a configuration in which electricity is passed between flange portions provided at both ends 11a, 11b of the second cooling pipe 11 in the longitudinal direction can be mentioned.

[0037] The forming device 4 forms the molten glass Gm supplied from the downstream end 11b of the second cooling pipe 11 into a tubular shape by the Danner process. The forming device 4 includes a cylindrical sleeve 12 and a drive device 13 that drives the sleeve 12 to rotate.

[0038] The molten glass Gm supplied from the downstream end 11b of the second cooling pipe 11 is continuously wound around the outer circumferential surface of the sleeve 12 which is driven to rotate by the drive device 13, and is formed into a long glass tube Gp of a predetermined shape by air blown into the sleeve 12. The long glass tube Gp is ​​conveyed downstream and cut to a predetermined length to produce a glass tube as a glass article. The forming device 4 may be one which forms a glass tube from the molten glass Gm by another method such as the Vello method.

[0039] The first cooling pipe 10 and the second cooling pipe 11 of the transfer device 3 are both composed of transfer pipes. Peripheral equipment of the transfer pipes of the transfer device 3 will be described using the peripheral equipment of the first cooling pipe 10 as an example. Note that the peripheral equipment of the first cooling pipe 10 described below can also be applied as the peripheral equipment of the second cooling pipe 11.

[0040] 2, the peripheral equipment of the first cooling pipe 10 includes a retaining brick 14 that is disposed on the outer periphery of the first cooling pipe 10 as a transfer pipe and retains the first cooling pipe 10, and a casing 16 that is disposed outside the retaining brick 14 with a space 15 interposed therebetween. In other words, the first cooling pipe 10 and the retaining brick 14 are housed in the casing 16 with the space 15 interposed between them.

[0041] The casing 16 has a rectangular shape in the cross section shown in the figure. In the following description, the width direction of the casing 16 is simply referred to as the width direction, and the longitudinal direction of the casing 16 is simply referred to as the longitudinal direction. In the cross section shown in the figure, the retaining brick 14 has an inner surface 14a that is circular and in contact with the outer surface 10c of the first cooling pipe 10, and an outer surface 14b that is rectangular. In addition, the retaining brick 14 surrounds the outer periphery of the first cooling pipe 10 all around.

[0042] The retaining brick 14 is supported by an inner surface 16aa of the bottom wall 16a of the casing 16 via a plurality of (two in the illustrated example) support members 17. The two support members 17 support both ends in the width direction of the lower surface 14c of the retaining brick 14 from below. A plurality of these support members 17 are also installed at intervals in the longitudinal direction. Therefore, the space 15 communicates below the retaining brick 14, and thus the space 15 exists around the entire outer periphery of the retaining brick 14. The retaining brick 14 may be supported by inner surfaces 16ba of the side walls 16b of the casing 16 and / or an inner surface 16ca of the upper wall 16c via support members not illustrated. In this embodiment, the retaining brick 14 is divided at a height position H1 of the vertical center of the first cooling pipe 10.

[0043] The retaining bricks 14 are formed of a refractory material such as electroformed bricks. The support members 17 are formed of a refractory material such as fired bricks. The casing 16 is formed of a refractory material such as a heat-resistant board, a heat-resistant blanket, fired bricks, castables, etc. The casing 16 may be formed of a steel material such as heat-resistant steel, or may be formed of a refractory material and a steel material.

[0044] In this embodiment, the peripheral equipment of the first cooling pipe 10 further includes a heating device 18 and a cooling device 19 .

[0045] The heating device 18 heats the first cooling pipe 10 via the retaining bricks 14, and heats the molten glass Gm in the first cooling pipe 10. The heating device 18 is disposed outside the retaining bricks 14. This allows the heating device 18 to be easily disposed and maintained. In this embodiment, the heating device 18 is inserted into the casing 16 from the side wall 16b of the casing 16, and is configured to heat the atmosphere in the space 15 within the casing 16.

[0046] For example, a burner, an electric heater, a hot air heater, etc. can be used as the heating device 18. In this embodiment, a case where the heating device 18 is a burner will be illustrated.

[0047] The cooling device 19 cools the first cooling pipe 10 via the retaining bricks 14, and cools the molten glass Gm in the first cooling pipe 10. The cooling device 19 is disposed outside the retaining bricks 14. This allows the cooling device 19 to be easily disposed and maintained. In this embodiment, the cooling device 19 is inserted into the casing 16 from the side wall 16b of the casing 16, and is configured to cool the atmosphere in the space 15 within the casing 16.

[0048] For example, a cold air fan, an air conditioner, a blower, etc. can be used as the cooling device 19. In this embodiment, a case where the cooling device 19 is a cold air fan will be illustrated.

[0049] The casing 16 has an air vent 20 functioning as an exhaust port or an intake port in the top wall 16c. The position where the air vent 20 is formed is not limited to the top wall 16c, and it may be in the bottom wall 16a, the side wall 16b, or the like.

[0050] Next, a method for manufacturing a glass article using the manufacturing apparatus 1 configured as above will be described.

[0051] As shown in FIG. 3, the present manufacturing method includes a start-up process S1 and a production process S2.

[0052] The start-up step S1 is a step of starting up the melting furnace 2 to a state where the production step S2 can be performed. In the start-up step S1, the depth of the molten glass Gm in the melting furnace 2 is gradually increased to a level where the production step S2 can be performed.

[0053] In the start-up process S1, in order to increase the depth of the molten glass Gm in the melting furnace 2, the glass frit Gr is supplied from the charging port 2a into the melting furnace 2 using the charging device 5. The glass frit Gr and the molten glass Gm are heated by a heating unit provided in the melting furnace 2.

[0054] In the start-up process S1, as the depth of the molten glass Gm in the melting furnace 2 increases, the depth of the molten glass Gm in the throat 8, the fining tank 9, the first cooling pipe 10 (see arrow X in FIG. 4), and the second cooling pipe 11 also gradually increases.

[0055] In the process of increasing the depth of the molten glass Gm in this way, the second cooling pipe 11 can be electrically heated, but the first cooling pipe 10 cannot be electrically heated because it does not have a facility for electrically heating. On the other hand, in the start-up step S1 (particularly, in the early stage of the start-up step S1), when the depth of the molten glass Gm in the first cooling pipe 10 is shallow and the flow rate of the molten glass Gm is low, the amount of heat brought into the first cooling pipe 10 by the molten glass Gm per unit time is small. As a result, the temperature of the molten glass Gm in the first cooling pipe 10 that is not electrically heated is likely to decrease. Therefore, as shown in FIG. 4, in the start-up step S1, the first cooling pipe 10 is heated by the heating device 18 via the holding bricks 14. In this way, the molten glass Gm in the first cooling pipe 10 can be reliably heated, so that the occurrence of glass clogging in the first cooling pipe 10 can be reliably suppressed. In particular, when the holding bricks 14 are formed of electrocast bricks, the thermal conductivity of the holding bricks 14 is good, so that the first cooling pipe 10 can be efficiently heated via the holding bricks 14.

[0056] In this embodiment, the heating device 18 is composed of a burner, and burns fuel in the lower part of the space 15 in the casing 16 to form a flame F. By using the flame F in this manner, a large amount of heat is generated, making it possible to heat at a high temperature. Specifically, the temperature of the space 15 in the casing 16 is preferably, for example, 1000 to 1400°C.

[0057] The atmosphere heated by the flame F in the lower part of the space 15 in the casing 16 moves to the upper part of the space 15, so that the space 15 is uniformly heated. Therefore, the entire first cooling pipe 10 is uniformly heated, and the molten glass Gm in the first cooling pipe 10 can be efficiently heated. The flame F may be formed at any position within the space 15. For example, the flame F may be formed at the upper part of the space 15.

[0058] Exhaust gas Y from the burner is exhausted to the outside of the casing 16 through the vent hole 20 of the casing 16. This allows the pressure in the space 15 within the casing 16 to be maintained at an appropriate level.

[0059] As shown in Fig. 1, the production process S2 includes a melting process in which molten glass Gm is produced from glass frit Gr in a melting furnace 2, a fining process in which the molten glass Gm produced in the melting process is fining in a fining tank 9, a condition adjustment process in which the molten glass Gm finished in the fining process is adjusted to a state suitable for forming in a first cooling pipe 10 and a second cooling pipe 11, and a forming process in which a glass tube is formed from the molten glass Gm adjusted in the condition adjustment process using a forming device 4. In this embodiment, in the melting process included in the production process S2, glass frit Gr is continuously supplied from a feed port 2a into the melting furnace 2 using a feed device 5, and molten glass Gm is continuously produced.

[0060] As shown in FIG. 5, in the production step S2, the depth of the molten glass Gm in the first cooling pipe 10 is deep (in the illustrated example, the flow path cross section of the first cooling pipe 10 is filled with the molten glass Gm), and the flow rate of the molten glass Gm is greater than that in the start-up step S1. Therefore, the amount of heat brought into the first cooling pipe 10 by the molten glass Gm per unit time is large, and the temperature of the molten glass Gm in the first cooling pipe 10, which is not heated by electrical current, is also less likely to decrease. Therefore, in the production step S2, in order to adjust the viscosity of the molten glass Gm in the first cooling pipe 10 and the second cooling pipe 11 to a state suitable for molding, the first cooling pipe 10 is cooled by the cooling device 19 via the retaining bricks 14. At this time, a similar cooling device may be provided in the peripheral equipment of the second cooling pipe 11 to cool the second cooling pipe 11.

[0061] In this embodiment, the cooling device 19 is composed of a cold air blower, and supplies cold air C at the upper part of the space 15 in the casing 16. The atmosphere cooled by the cold air C at the upper part of the space 15 in the casing 16 moves to the lower part of the space 15, so that the space 15 is uniformly cooled. Therefore, the entire first cooling pipe 10 can be cooled more uniformly, and the molten glass Gm in the first cooling pipe 10 can be cooled efficiently. The supply position of the cold air C may be any position within the space 15. For example, the supply position of the cold air C may be the lower part of the space 15. The cooling device 19 may be omitted. When the cooling device 19 is omitted, the first cooling pipe 10 can also be cooled by introducing outside air from the lower part of the casing 16 into the space 15.

[0062] Second Embodiment In the second embodiment of the method for manufacturing a glass article, if a power outage occurs during production process S2, the first cooling pipe 10 is heated via the retaining brick 14 by a heating device (preferably a burner) 18 arranged outside the retaining brick 14 in a manner similar to that shown in Figure 4.

[0063] When a power outage occurs in the production process S2, heating by the electrodes in the melting furnace 2 and the fining tank 9 becomes impossible, or the amount of heating by the electrodes decreases. In addition, the transfer pipe becomes impossible to electrically heat, or the amount of heating in the transfer pipe decreases. As a result, the temperature of the molten glass Gm in the transfer pipe is likely to decrease. Therefore, during a power outage, it is preferable to heat the first cooling pipe 10 via the retaining bricks 14 by the heating device 18. In this way, the molten glass Gm in the first cooling pipe 10 can also be heated, so that glass clogging in the first cooling pipe 10 can be reliably suppressed.

[0064] In the event of a power outage during production process S2, it is preferable to heat the second cooling pipe 11 via the retaining bricks by arranging a heating device on the outside of the retaining bricks of the second cooling pipe 11 as well, as in the case of the first cooling pipe 10.

[0065] Although an embodiment of the present invention has been described, the embodiment of the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

[0066] In the above-described first and second embodiments, the casing 16 may be omitted. However, from the viewpoint of efficiently utilizing the heating effect of the heating device 18 and the cooling effect of the cooling device 19 and suppressing temperature fluctuations of the molten glass Gm accompanying fluctuations in the outside air temperature, it is preferable to provide the casing 16 that defines the space 15.

[0067] In the above second embodiment, a case has been described in which the heating device of the present invention is applied to a transfer pipe (e.g., the second cooling pipe 11) that is equipped with equipment for electrical heating but cannot be electrically heated due to a power outage, but a transfer pipe that is being electrically heated may also be supplementarily heated by the heating device of the present invention.

[0068] In the above embodiment, the glass article is a glass tube, but is not limited thereto. The glass article may be, for example, a glass sheet, a glass roll obtained by winding a strip-shaped glass ribbon into a roll, an optical glass part, a glass block, a glass fiber, or the like. [Explanation of symbols]

[0069] 1 Manufacturing equipment 2 Melting furnace 3 Transfer device 4 Molding equipment 5 Feeding device 6 Raw material hopper 7 Conveyor 8. Throat 9. Clarifying tank 10 First cooling pipe 11 Second cooling pipe 12 Sleeve 13 Drive unit 14 Retaining Brick 15 Space 16 Casing 17 Support member 18 Heating device 19 Cooling device 20 Vent C Cold air F Flame Gm Molten Glass Gp Long glass tube Gr Glass raw material S1 Start-up process S2 Production process

Claims

1. A glass article manufacturing apparatus comprising: a transfer pipe for transferring molten glass; and a retaining brick disposed on an outer periphery of the transfer pipe for retaining the transfer pipe, A glass article manufacturing apparatus comprising: a heating device disposed outside the retaining bricks and configured to heat the transfer pipe via the retaining bricks.

2. a casing in which the transfer pipe and the retaining bricks are housed and a space is provided between the transfer pipe and the retaining bricks, The apparatus for manufacturing a glass article according to claim 1 , wherein the heating device heats an atmosphere within the casing.

3. The apparatus for manufacturing a glass article according to claim 2 , wherein the heating device is a burner.

4. The apparatus for manufacturing a glass article according to claim 3 , wherein the burner forms a flame in a lower portion inside the casing.

5. 4. The apparatus for manufacturing a glass article according to claim 2, wherein the wall of the casing is made of a refractory material.

6. 3. The apparatus for manufacturing a glass article according to claim 1, wherein the retaining bricks are electroformed bricks.

7. The apparatus for manufacturing a glass article according to claim 1 , wherein the heating device is a burner.

8. 3. The apparatus for manufacturing a glass article according to claim 1, further comprising a cooling device arranged outside the retaining bricks and configured to cool the transfer pipe via the retaining bricks.

9. A method for producing a glass article, comprising: a production step of producing a glass article from molten glass using a glass article production device including a transfer pipe for transferring molten glass and a retaining brick arranged on an outer periphery of the transfer pipe and retaining the transfer pipe, a rise step of increasing a depth of the molten glass in the transfer pipe as a pre-step of the production step, A method for manufacturing a glass article, characterized in that in the raising step, a heating device is disposed outside the retaining bricks, and the transfer pipe is heated by the heating device via the retaining bricks.

10. A method for producing a glass article, comprising: a production step of producing a glass article from molten glass using a glass article production device including a transfer pipe for transferring molten glass and a retaining brick arranged on an outer periphery of the transfer pipe and retaining the transfer pipe, A method for manufacturing a glass article, characterized in that, in the event of a power outage during the production process, a heating device is disposed outside the retaining bricks, and the heating device heats the transfer pipe via the retaining bricks.

Images