Molding device

Abstract

The utility model provides a forming device, and provides a technology for arranging a heat insulation plate at a proper position. A molding device for molding molten glass, the molding device being provided with: a molding furnace in which the molten glass is accommodated; an exhaust pipe for discharging gas from the inside of the forming furnace to the outside of the forming furnace; and a heat insulating plate disposed around the exhaust pipe.

Description

Technical Field

[0001] The present invention relates to a glass manufacturing method and a forming device. Background Art

[0002] The glass manufacturing method includes a step of melting glass raw materials in a melting furnace to obtain molten glass and a step of forming the molten glass in a forming furnace. Patent Document 1 discloses a melting device including a melting furnace. Patent Documents 2 and 3 disclose forming devices including a forming furnace.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-75069

[0006] Patent Document 2: Japanese Patent Application Laid-Open No. 11-302024

[0007] Patent Document 3: Japanese Patent Application Laid-Open No. 11-21137 Utility Model Content

[0008] Issues to be Solved by Utility Models

[0009] Melting furnaces and forming furnaces emit radiant heat. Workers sometimes work outside the melting furnaces and forming furnaces. In order to protect workers from radiant heat, it is possible to arrange heat shields outside the melting furnaces and forming furnaces. However, if heat shields are arranged wastefully, heat release will stagnate, which may cause damage to the equipment or deterioration of glass quality.

[0010] One aspect of the present disclosure provides a technology for disposing a heat insulation board at an appropriate position.

[0011] Means for solving problems

[0012] The glass manufacturing method according to one embodiment of the present disclosure comprises the steps of melting glass raw materials in a melting furnace to obtain molten glass and forming the molten glass in a forming furnace. The glass manufacturing method comprises the steps of measuring a heat flux of radiant heat outside the melting furnace or the forming furnace and arranging a heat insulation board outside the melting furnace or the forming furnace based on the measurement result of the heat flux.

[0013] Utility Model Effect

[0014] According to one aspect of the present disclosure, the heat shielding plate can be arranged at an appropriate position by arranging the heat shielding plate based on the measurement result of the heat flux. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a cross-sectional view showing a glass manufacturing apparatus according to one embodiment.

[0016] Figure 2 It is shown Figure 1 A cross-sectional view of a specific example of a glass manufacturing apparatus.

[0017] Figure 3 It is a cross-sectional view showing an example of a molding device.

[0018] Figure 4 yes Figure 3 Side view of the exhaust pipe and heat shield shown.

[0019] Figure 5 It is a cross-sectional view showing an example of a heat insulating plate and a spacer.

[0020] Figure 6 It is a cross-sectional view showing an example of the structure of the heat insulation board.

[0021] Figure 7 It is a cross-sectional view showing another example of the structure of the heat insulation board. DETAILED DESCRIPTION

[0022] Hereinafter, the embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that in each of the drawings, the same or corresponding structures are marked with the same reference numerals, and the description is sometimes omitted. In each of the drawings, the X-axis direction, the Y-axis direction, and the Z-axis direction are directions perpendicular to each other, the X-axis direction and the Y-axis direction are horizontal directions, and the Z-axis direction is a vertical direction. The X-axis direction is the conveying direction of the glass ribbon GR, and the Y-axis direction is the width direction of the glass ribbon GR. In the specification, "~" indicating a numerical range means that the numerical values ​​recorded before and after it are included as the lower limit and upper limit.

[0023] First, refer to Figure 1 , a glass manufacturing apparatus 1 according to one embodiment will be described. The glass manufacturing apparatus 1 includes, for example, a melting device 2, a forming device 3, a slow cooling device 4, and a processing device 5 in sequence. It should be noted that the glass manufacturing apparatus 1 only needs to include the melting device 2 and the forming device 3.

[0024] The melting device 2 melts glass raw materials to obtain molten glass G. Glass raw materials are prepared by mixing a plurality of materials. Glass raw materials may contain cullet in order to recycle glass. Glass raw materials may be powder raw materials or granulated raw materials obtained by granulating the powder raw materials.

[0025] The forming device 3 forms the molten glass G obtained by the melting device 2 into a glass article of a desired shape. As a forming method for obtaining a plate-shaped glass article, a float method, a melting method or a rolling method is used. A plate-shaped glass article is generally called a glass ribbon. As a forming method for obtaining a tubular glass article, a Vello method or a Danner method is used.

[0026] The slow cooling device 4 slowly cools the glass article formed by the forming device 3. The slow cooling device 4, for example, comprises a heat treatment furnace and a conveying roller for conveying the glass article in a desired direction inside the heat treatment furnace. For example, a plurality of conveying rollers are arranged at intervals in the horizontal direction. The glass article is slowly cooled during the period when it is conveyed from the entrance of the heat treatment furnace to the exit of the heat treatment furnace. If the glass article is slowly cooled, the residual strain can be reduced.

[0027] The processing device 5 processes the glass article after slow cooling by the slow cooling device 4 into a desired shape. The processing device 5 includes, for example, one or more selected from a cutting device, a grinding device, a polishing device, and a coating device. The cutting device cuts the glass after slow cooling by the slow cooling device 4. The cutting device, for example, forms a scribe line on the glass after slow cooling by the slow cooling device 4 and cuts the glass along the scribe line. The scribe line is formed using a cutter or a laser beam. The grinding device grinds the glass after slow cooling by the slow cooling device 4. The polishing device polishes the glass after slow cooling by the slow cooling device 4. The coating device forms a desired film on the glass after slow cooling by the slow cooling device 4.

[0028] Although not shown, the glass manufacturing apparatus 1 may also include a clarifier. The clarifier removes bubbles contained in the molten glass G obtained by the melting apparatus 2 before the molten glass G is formed by the forming apparatus 3. As a method for removing bubbles, for example, one or more selected from a method of reducing the pressure of the surrounding atmosphere of the molten glass G and a method of heating the molten glass G to a high temperature are used. The clarifier may also be a part of the melting apparatus 2.

[0029] Next, refer to Figure 2 , details of the glass manufacturing apparatus 1 will be described. Figure 2 The glass manufacturing device 1 manufactures a glass plate by a float process. The glass plate is, for example, alkali-free glass, aluminosilicate glass, borosilicate glass, or soda-lime glass. Alkali-free glass means glass that substantially does not contain alkali metal oxides such as Na2O and K2O. Here, substantially not containing alkali metal oxides means that the total amount of alkali metal oxide content is 0.1 mass % or less.

[0030] The use of the glass plate is not particularly limited, but for example, it is a cover glass for a display (such as a liquid crystal display or an organic EL display). When the use of the glass plate is a cover glass, the glass plate is a chemically strengthened glass. Chemically strengthened glass, unlike alkali-free glass, contains an alkali metal oxide.

[0031] The thickness of the glass plate is selected according to the purpose of the glass plate. When the glass plate is used as a cover glass of a display, the thickness of the glass plate is, for example, 0.1 mm to 5.0 mm. When the glass plate is used as a glass substrate of a display, the thickness of the glass plate is, for example, 0.1 mm to 0.7 mm. When the glass plate is used as a windshield of an automobile, the thickness of the glass plate is, for example, 0.2 mm to 3.0 mm.

[0032] The melting device 2 includes, for example, a melting furnace 21 for accommodating molten glass G and a burner 22 for forming a flame above the molten glass G accommodated in the melting furnace 21. The glass raw material put into the melting furnace 21 is gradually melted into the molten glass G by the radiation heat of the flame formed by the burner 22. The molten glass G is continuously transported from the melting device 2 to the forming device 3. The heating source is not limited to the burner 22, and may also be an electric heater or an electrode. The electrode heats the molten glass G by causing an electric current to flow to the molten glass G.

[0033] The forming device 3 includes a forming furnace 31, and the molten glass G is formed into a desired shape inside the forming furnace 31. The forming furnace 31 includes, for example, a bath 311. The bath 311 contains a molten metal M. As the molten metal M, for example, molten tin is used. In addition to molten tin, a molten tin alloy or the like can also be used, and the molten metal M only needs to have a higher density than the molten glass G. The molten glass G is continuously supplied onto the molten metal M, and is formed into a glass ribbon GR in a strip shape by utilizing the smooth liquid surface of the molten metal M.

[0034] The forming furnace 31 has a ceiling 312 above the bath 311. The interior of the forming furnace 31 is filled with a reducing gas to prevent oxidation of the molten metal M, and is maintained at a pressure higher than atmospheric pressure. The reducing gas is, for example, a mixed gas of nitrogen and hydrogen, containing 85% to 98.5% by volume of nitrogen and 1.5% to 15% by volume of hydrogen. The reducing gas is supplied from the joints between the bricks of the ceiling 312 and the holes of the ceiling 312.

[0035] The forming device 3 includes a heater 32 for heating the glass ribbon GR. The heater 32 is suspended from the ceiling 312 of the forming furnace 31, for example, and heats the glass ribbon GR passing therethrough. The heater 32 is, for example, an electric heater, and is heated by being energized. A plurality of heaters 32 are arranged in a matrix in the conveying direction and the width direction of the glass ribbon GR. By controlling the output of the plurality of heaters 32, the temperature distribution of the glass ribbon GR can be controlled, and the plate thickness distribution of the glass ribbon GR can be controlled.

[0036] The slow cooling device 4 includes a slag box 41 and a lifting roller 42. The slag box 41 is an example of a heat treatment furnace. The lifting roller 42 is arranged inside the slag box 41, and pulls the glass ribbon GR from the molten metal M. The lifting roller 42 is an example of a conveying roller. A plurality of lifting rollers 42 are arranged at intervals in the conveying direction (X-axis direction) of the glass ribbon GR. The number of lifting rollers 42 is not particularly limited. The lifting roller 42 is driven to rotate by a driving device such as a motor not shown in the figure, and the driving force thereof is used to convey the glass ribbon GR obliquely upward. The axial direction of the lifting roller 42 is the same direction as the width direction (Y-axis direction) of the glass ribbon GR.

[0037] The slow cooling device 4 may also be equipped with a heater (not shown) on the ceiling of the slag box 41 in order to adjust the temperature of the glass ribbon GR. The heater may be provided not only above the glass ribbon GR but also below it. Inside the slag box 41, the temperature of the glass ribbon GR is preferably (Tg-50)°C to (Tg+30)°C based on the glass transition point Tg of the glass ribbon GR.

[0038] The slow cooling device 4 includes a slow cooling furnace 45 and an annealing roller 46. The slow cooling furnace 45 is arranged on the downstream side of the slag box 41. The slow cooling furnace 45 is an example of a heat treatment furnace. The annealing roller 46 is arranged inside the slow cooling furnace 45, and conveys the glass ribbon GR in the length direction (X-axis direction) of the glass ribbon GR. The annealing roller 46 is an example of a conveying roller. A plurality of annealing rollers 46 are arranged at intervals in the conveying direction of the glass ribbon GR. The number of annealing rollers 46 is not particularly limited. The annealing roller 46 is driven to rotate by a driving device such as a motor not shown in the figure, and the driving force thereof is used to convey the glass ribbon GR in the horizontal direction (X-axis direction). The axial direction of the annealing roller 46 is the same direction as the width direction (Y-axis direction) of the glass ribbon GR.

[0039] The slow cooling device 4 slowly cools the glass ribbon GR to a temperature not higher than the strain point of the glass while conveying it with the annealing rollers 46. The slow cooling device 4 may include a heater (not shown) inside the slow cooling furnace 45 in order to adjust the temperature of the glass ribbon GR.

[0040] Next, refer to Figure 3 to Figure 5 , a specific example of the forming device 3 is described. The forming device 3 includes a forming furnace 31 that accommodates the molten glass G inside and an exhaust pipe 33 that exhausts the gas inside the forming furnace 31 to the outside of the forming furnace 31. The forming furnace 31 includes, for example, a bath 311, a ceiling 312, and a side wall 313. The side wall 313 is provided above the bath 311. The side wall 313 includes a brick layer 314 and a metal layer 315 provided outside the brick layer 314. The side wall 313 is provided on both sides in the width direction of the glass ribbon GR (the positive direction side of the Y axis and the negative direction side of the Y axis).

[0041] The exhaust pipe 33 exhausts the gas inside the forming furnace 31 to the outside of the forming furnace 31 by utilizing the pressure difference between the inside of the forming furnace 31 and the outside of the forming furnace 31, thereby maintaining the atmosphere of the forming furnace 31 at a desired atmosphere. Figure 4 As shown, a plurality of exhaust pipes 33 are provided at intervals in the conveying direction (X-axis direction) of the glass ribbon GR. Although not shown, the exhaust pipes 33 are provided on both sides (Y-axis positive direction side and Y-axis negative direction side) of the glass ribbon GR in the width direction.

[0042] like Figure 3 As shown, the exhaust pipe 33 exhausts gas, for example, through the gap between the bath 311 and the side wall 313. The exhaust pipe 33 has, for example, a horizontal pipe 331 protruding from the side wall 313 and a vertical pipe 332 extending upward from the front end of the horizontal pipe 331. A transparent plate 333 serving as an observation window is provided at the front end of the horizontal pipe 331.

[0043] The vertical pipe 332 is provided outside the forming furnace 31. An ascending airflow is generated inside the vertical pipe 332, and exhaust is performed by the flow of the ascending airflow and the pressure difference. The exhausted gas contains hydrogen, and the flame Fr is formed by the reaction of the hydrogen with the atmosphere. The flame Fr is formed at the upper end of the vertical pipe 332. It should be noted that instead of exhausting by pressure difference, an exhaust fan can be used for forced exhaust.

[0044] The forming furnace 31, the exhaust pipe 33, and the flame Fr emit radiant heat. Radiant heat refers to heat transferred by infrared rays.

[0045] The forming device 3 includes heat flux meters 34A and 34B. The heat flux meters 34A and 34B measure the heat flux of radiant heat outside the forming furnace 31. Heat flux (W / m 2 ) is the amount of heat that traverses a unit area per unit time. Heat flux is proportional to the temperature gradient in the direction of heat flow. Heat flux is a parameter that indicates not only the amount of heat but also the direction of heat flow.

[0046] The heat flux meters 34A and 34B are different from thermometers and can measure not only the amount of heat but also the direction of heat flow. Thus, the heat shielding plate described later can be arranged at an appropriate position so as to efficiently block the flow of heat. In addition, by efficiently blocking the flow of heat, it is possible to suppress the wasteful arrangement of the heat shielding plate, suppress the stagnation of heat release from the forming furnace 31, and suppress the damage to the forming device 3 or the deterioration of the quality of the glass.

[0047] The heat flux meters 34A and 34B are mounted on, for example, a rotating support 35. The rotating support 35 is provided at the front end of a horizontal rotating shaft 36. The heat flux meter 34A measures the heat flux in the direction along the rotating shaft 36. The heat flux meter 34B measures the heat flux in the direction orthogonal to the rotating shaft 36. By rotating the rotating shaft 36, the heat flux meters 34A and 34B rotate together with the rotating support 35. The measuring direction of the heat flux meter 34B can be changed while maintaining the measuring direction of the heat flux meter 34A.

[0048] The molding device 3 includes at least one (all in this embodiment) selected from the first heat insulating plate 37A, the second heat insulating plate 37B, the third heat insulating plate 37C, and the fourth heat insulating plate 37D. The first heat insulating plate 37A, the second heat insulating plate 37B, the third heat insulating plate 37C, and the fourth heat insulating plate 37D are arranged around the exhaust pipe 33 based on the measurement results of the heat flux meter 34A or the heat flux meter 34B, for example.

[0049] It should be noted that the forming device 3 may be provided with at least one selected from the first heat insulating plate 37A, the second heat insulating plate 37B, the third heat insulating plate 37C, and the fourth heat insulating plate 37D, but may not be provided with all of them. The first heat insulating plate 37A, the second heat insulating plate 37B, the third heat insulating plate 37C, and the fourth heat insulating plate 37D may also be a detachable type using magnets. In addition, the forming device 3 may also be provided with a heat insulating plate not shown. The heat insulating plate may be arranged according to the measurement result of the heat flux.

[0050] The first heat insulating plate 37A directs the radiation heat of the flame Fr formed at the upper end of the vertical pipe 332 of the exhaust pipe 33 to a direction away from the side wall 313 of the forming furnace 31. It is possible to suppress thermal degradation of the side wall 313 of the forming furnace 31 caused by the radiation heat of the flame Fr. In addition, the first heat insulating plate 37A restricts the radiation heat of the flame Fr from going upward. Thus, it is possible to suppress disconnection of the wiring 38 that supplies power to the heater 32. The first heat insulating plate 37A has, for example, a rectangular upper wall 378 and three side walls 379 extending downward from three sides of the upper wall 378.

[0051] The first heat insulating plate 37A is provided to be separated from the forming furnace 31 and the exhaust pipe 33 in order to prevent heat from being conducted between the forming furnace 31 and the exhaust pipe 33. A frame (not shown) is provided outside the forming furnace 31. The frame includes a plurality of columns and beams mounted on the plurality of columns. The first heat insulating plate 37A is fixed to the frame. In the present embodiment, the first heat insulating plate 37A is provided above all the exhaust pipes 33, but it may not be provided above all the exhaust pipes 33, and it may be provided above a part of the exhaust pipes 33.

[0052] The second heat insulating plate 37B restricts the radiant heat of the flame Fr formed at the upper end of the vertical pipe 332 of the exhaust pipe 33 from going downward. The amount of heat acting on the worker working below the second heat insulating plate 37B can be reduced. If the amount of heat acting on the worker before the second heat insulating plate 37B is set to 100%, the amount of heat acting on the worker after the second heat insulating plate 37B is set can be reduced to about 81%.

[0053] The second heat insulating plate 37B is horizontally arranged and extends from the upper end of the vertical pipe 332 of the exhaust pipe 33 in a direction away from the side wall 313 of the forming furnace 31. The second heat insulating plate 37B is provided in all the exhaust pipes 33 in the present embodiment, but may not be provided in all the exhaust pipes 33, and may be provided in a part of the exhaust pipes 33.

[0054] The heat flux meter 34B measures the heat flux of the radiant heat emitted from the flame Fr after the first heat insulating plate 37A is installed and before the second heat insulating plate 37B is installed. If the measured value of the heat flux is greater than the threshold value, the second heat insulating plate 37B is installed. It should be noted that the heat flux meter 34B may also measure the heat flux of the radiant heat emitted from the second heat insulating plate 37B after the second heat insulating plate 37B is installed. The effect of installing the second heat insulating plate 37B can be confirmed.

[0055] The third heat insulation board 37C surrounds the outer periphery of the vertical pipe 332 of the exhaust pipe 33. The third heat insulation board 37C restricts the radiant heat of the vertical pipe 332 from going to the side. The heat acting on the operator working next to the vertical pipe 332 can be reduced. The third heat insulation board 37C is wrapped around the outer periphery of the vertical pipe 332 of the exhaust pipe 33 and formed into a cylindrical shape. The third heat insulation board 37C is arranged in a manner avoiding the transparent plate 333 serving as an observation window. The third heat insulation board 37C is arranged in all the exhaust pipes 33 in the present embodiment, but it may not be arranged in all the exhaust pipes 33, and may be arranged in a part of the exhaust pipes 33.

[0056] The heat flux meter 34A is arranged facing the exhaust pipe 33 before the third heat insulating plate 37C is installed, and measures the heat flux of the radiant heat emitted from the exhaust pipe 33. If the measured value of the heat flux is greater than the threshold value, the third heat insulating plate 37C is installed. It should be noted that the heat flux meter 34A may also measure the heat flux of the radiant heat emitted from the third heat insulating plate 37C after the third heat insulating plate 37C is installed. The effect of installing the third heat insulating plate 37C can be confirmed.

[0057] The fourth heat insulating plate 37D is arranged to face the side wall 313 of the forming furnace 31. The fourth heat insulating plate 37D restricts the radiant heat of the side wall 313 of the forming furnace 31 from going to the side. It is possible to reduce the amount of heat acting on the operator working next to the side wall 313 of the forming furnace 31. The fourth heat insulating plate 37D is arranged parallel to the side wall 313 of the forming furnace 31 and is formed in a plate shape. The fourth heat insulating plate 37D is arranged between the side wall 313 of the forming furnace 31 and the vertical pipe 332 of the exhaust pipe 33.

[0058] The heat flux meter 34A is arranged facing the side wall 313 of the forming furnace 31 before the fourth heat insulating plate 37D is installed, and measures the heat flux of the radiant heat emitted from the side wall 313. If the measured value of the heat flux is greater than the threshold value, the fourth heat insulating plate 37D is installed. It should be noted that the heat flux meter 34A may also measure the heat flux of the radiant heat emitted from the fourth heat insulating plate 37D after the fourth heat insulating plate 37D is installed. The effect of installing the fourth heat insulating plate 37D can be confirmed.

[0059] like Figure 5 As shown, an air layer AL is formed between the fourth heat insulating plate 37D and the forming furnace 31. The air layer AL functions as a heat insulating layer to suppress heat transfer from the forming furnace 31 to the fourth heat insulating plate 37D. Thus, the temperature rise of the fourth heat insulating plate 37D can be suppressed, and the radiant heat radiated from the fourth heat insulating plate 37D can be reduced.

[0060] A spacer 391 for regulating the thickness of the air layer AL may be provided between the fourth heat insulating plate 37D and the forming furnace 31. The spacer 391 regulates the thickness of the air layer AL by, for example, limiting the rotation of the fourth heat insulating plate 37D caused by the hinge 392. Thus, the thickness of the air layer AL can be adjusted to a desired thickness.

[0061] Next, refer to Figure 6 , an example of the structure of the first heat insulating plate 37A is described. It should be noted that the second heat insulating plate 37B is configured similarly to the first heat insulating plate 37A, so the description is omitted. The first heat insulating plate 37A includes, for example, a heat insulating layer 371 and a metal layer 372 provided on one side of the heat insulating layer 371.

[0062] The heat insulating layer 371 is an aggregate of at least one of inorganic fibers and inorganic particles. The inorganic fibers and inorganic particles are composed of, for example, ceramics, glass, or carbon. The ceramics include, for example, silicon oxide, aluminum oxide, or a compound of silicon oxide and aluminum oxide. The heat insulating layer 371 may also include an inorganic binder. The heat insulating layer 371 may also include a rope for bundling the above-mentioned aggregate.

[0063] The metal layer 372 suppresses the emission of radiant heat by reflecting infrared rays. The metal layer 372 is arranged on the side opposite to the flame Fr with reference to the heat insulating layer 371. The heat insulating layer 371 prevents the flame Fr from contacting the metal layer 372, suppressing the discoloration of the metal layer 372. As a result, it is possible to suppress the decrease in the reflectivity of infrared rays. The material of the metal layer 372 is not particularly limited as long as it is a metal with high heat resistance, but is, for example, stainless steel.

[0064] Next, refer to Figure 7 , an example of the structure of the third heat insulating board 37C is described. It should be noted that the fourth heat insulating board 37D is configured in the same manner as the third heat insulating board 37C, so the description is omitted. The third heat insulating board 37C, for example, includes a heat insulating layer 373 and a metal layer 374 that accommodates the heat insulating layer 373. The heat insulating layer 373 is an aggregate of at least one of inorganic fibers and inorganic particles. The heat insulating layer 373 may also include an inorganic binder. The metal layer 374 suppresses the radiation of radiant heat by reflecting infrared rays. The metal layer 374 maintains the shape of the heat insulating layer 373 by wrapping the heat insulating layer 373. The metal layer 374 is, for example, aluminum foil.

[0065] In the above embodiment, the heat shielding plate is arranged outside the forming furnace 31 based on the measurement result of the heat flux, but the technology disclosed in the present invention is not limited thereto. The heat shielding plate may be arranged outside the melting furnace 21 based on the measurement result of the heat flux.

[0066] Regarding the above-mentioned embodiment and the like, the following supplementary notes are disclosed.

[0067] [Note 1]

[0068] A glass manufacturing method comprises the steps of melting glass raw materials inside a melting furnace to obtain molten glass and forming the molten glass inside a forming furnace, wherein the glass manufacturing method comprises: a step of measuring a heat flux of radiant heat outside the melting furnace or the forming furnace; and a step of arranging a heat insulation board outside the melting furnace or the forming furnace based on the measurement result of the heat flux.

[0069] [Note 2]

[0070] According to the glass manufacturing method described in Appendix 1, an exhaust pipe is provided to discharge the gas inside the forming furnace to the outside of the forming furnace, and the glass manufacturing method has a step of arranging the insulation board around the exhaust pipe based on the measurement result of the heat flux.

[0071] [Note 3]

[0072] A forming device for forming molten glass, wherein the forming device comprises: a forming furnace for accommodating the molten glass inside; an exhaust pipe for exhausting gas from the inside of the forming furnace to the outside of the forming furnace; and a heat insulation plate arranged around the exhaust pipe.

[0073] [Note 4]

[0074] The forming apparatus according to Supplementary Note 3 includes a heat flux meter for measuring a heat flux of radiant heat outside the forming furnace, wherein the heat shield plate is disposed around the exhaust pipe based on a measurement result of the heat flux.

[0075] [Note 5]

[0076] According to the forming device described in Note 3 or 4, the exhaust pipe includes a horizontal pipe protruding from the side wall of the forming furnace and a vertical pipe extending upward from the front end of the horizontal pipe outside the forming furnace, a flame is formed at the upper end of the vertical pipe, and the heat insulation plate includes a first heat insulation plate that directs the radiant heat of the flame in a direction away from the side wall of the forming furnace.

[0077] [Note 6]

[0078] According to the forming device described in any one of Notes 3 to 5, the exhaust pipe includes a horizontal pipe protruding from the side wall of the forming furnace and a vertical pipe extending upward from the front end of the horizontal pipe outside the forming furnace, a flame is formed at the upper end of the vertical pipe, and the heat insulation plate includes a second heat insulation plate for limiting the radiant heat of the flame from going downward.

[0079] [Note 7]

[0080] According to the forming device described in any one of Notes 3 to 6, the exhaust pipe includes a horizontal pipe protruding from the side wall of the forming furnace and a vertical pipe extending upward from the front end of the horizontal pipe outside the forming furnace, and the insulation plate includes a third insulation plate surrounding the outer periphery of the vertical pipe.

[0081] [Note 8]

[0082] The forming apparatus according to any one of Supplementary Notes 3 to 7, wherein the heat shielding plate includes a fourth heat shielding plate disposed to face a side wall of the forming furnace.

[0083] [Note 9]

[0084] The forming apparatus according to any one of Supplementary Notes 3 to 8, wherein an air layer is formed between the heat shield plate and the forming furnace.

[0085] [Note 10]

[0086] According to the forming apparatus according to Supplementary Note 9, a spacer that defines the thickness of the air layer is provided between the heat insulating plate and the forming furnace.

[0087] The above is an explanation of the glass manufacturing method and forming device involved in the present disclosure, but the present disclosure is not limited to the above-mentioned embodiments, etc. Various changes, corrections, substitutions, additions, deletions and combinations can be made within the scope of the claims. Of course, they also belong to the technical scope of the present disclosure.

[0088] Description of Reference Numerals

[0089] 1Glass manufacturing equipment

[0090] 2 Melting device

[0091] 21 Melting furnace

[0092] 3 Forming device

[0093] 31 Forming furnace

[0094] 37A First heat shield

[0095] 37B Second heat shield

[0096] 37C third heat shield

[0097] 37D fourth heat shield

[0098] G Molten Glass

Claims

1. A forming device for forming molten glass, characterized in that: The forming device comprises: A forming furnace, which contains the molten glass; an exhaust pipe for exhausting gas from the interior of the forming furnace to the exterior of the forming furnace; and The heat insulation plate is arranged around the exhaust pipe.

2. The forming device according to claim 1, wherein: The forming device includes a heat flux meter for measuring a heat flux of radiant heat outside the forming furnace. The heat shield plate is disposed around the exhaust pipe based on the measurement result of the heat flux.

3. The forming device according to claim 1 or 2, wherein: The exhaust pipe includes a horizontal pipe protruding from a side wall of the forming furnace and a vertical pipe extending upward from a front end of the horizontal pipe outside the forming furnace, and a flame is formed at an upper end of the vertical pipe. The thermal shield includes a first thermal shield that directs radiant heat from the flame in a direction away from the side wall of the forming furnace.

4. The forming device according to claim 1 or 2, wherein: The exhaust pipe includes a horizontal pipe protruding from a side wall of the forming furnace and a vertical pipe extending upward from a front end of the horizontal pipe outside the forming furnace, and a flame is formed at an upper end of the vertical pipe. The heat shield includes a second heat shield that limits radiant heat from the flame from going downward.

5. The forming device according to claim 1 or 2, wherein: The exhaust pipe includes a horizontal pipe protruding from a side wall of the forming furnace and a vertical pipe extending upward from a front end of the horizontal pipe outside the forming furnace. The heat insulating plate includes a third heat insulating plate surrounding the outer circumference of the vertical pipe.

6. The forming device according to claim 1 or 2, wherein: The heat insulating plate includes a fourth heat insulating plate disposed to face a side wall of the forming furnace.

7. The forming device according to claim 1 or 2, wherein: An air layer is formed between the heat insulation plate and the forming furnace.

8. The forming device according to claim 7, wherein: A spacer that defines the thickness of the air layer is provided between the heat shield plate and the forming furnace.

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