JP6951661B2 - Manufacturing method and manufacturing equipment for glass articles - Google Patents

Description

The present invention relates to a method and an apparatus for producing a glass article by molding molten glass.

As is well known, flat glass used in various fields has surface defects and waviness, as represented by glass substrates for flat panel displays (FPDs) such as liquid crystal displays (LCDs) and organic EL displays (OLEDs). The reality is that strict product quality is required.

In order to satisfy such a requirement, the overflow down draw method is widely used as a method for manufacturing flat glass. In the overflow down draw method, molten glass is poured into an overflow groove provided in the upper part of a molded body having a substantially wedge-shaped cross section, and the molten glass overflowing from the overflow groove on both sides is flowed along the side walls on both sides of the molded body. While flowing down, it is fused and integrated at the lower end of the molded body to continuously mold a single piece of flat glass.

As a device for manufacturing a glass article using the overflow down draw method, as disclosed in Patent Document 1, a molding furnace having a molded body inside, a slow cooling furnace installed below the molding furnace, and a slow cooling furnace provided below the slow cooling furnace are provided. Some are provided with a cooling part and a cutting part. In order to manufacture a glass article by this manufacturing apparatus, first, molten glass is overflowed from the top of the molded body and fused at the lower end of the molded body to form a plate glass (glass ribbon). Further, the end portion of the flat glass is gripped by an edge roller (cooling roller) and passed through a slow cooling furnace to remove the internal strain thereof. Then, the flat glass is cooled to room temperature by the cooling portion, and then cut to a predetermined size by the cutting portion.

Japanese Unexamined Patent Publication No. 2012-197185

In the conventional manufacturing method and manufacturing apparatus, the molten glass needs to have a viscosity of 300 Pa · s or more in order to grip the flat glass fused at the lower end of the molded body with an edge roller. Depending on the composition of the glass article to be molded, the molten glass may not reach the above viscosity at the time of fusion. In order to mold such a glass article by the overflow down draw method, it is conceivable to cool the molten glass so that the viscosity becomes moldable at the time of fusion by the molded body.

However, when the temperature of the cooled molten glass becomes the liquid phase temperature and a certain period of time elapses, the glass may be devitrified.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a glass article capable of adjusting the viscosity of molten glass while preventing devitrification.

The present invention is for solving the above-mentioned problems, and in a method for producing a glass article including a molding step of forming a glass article by flowing molten glass along the surface of the molded body, the molded body is upstream. A first portion on the side and a second portion on the downstream side are provided, and the first portion heats the molten glass flowing down the first portion to a temperature higher than the liquidus temperature. The second portion is arranged in one space, and the second portion is arranged in a second space where the molten glass that passes through the first portion and flows down the second portion is cooled to a temperature lower than the liquidus temperature. It is characterized by being done.

According to this method, the molten glass flowing down the molded body is heated to a temperature higher than the liquid phase temperature in the first space, so that it flows from the first part to the second part without causing devitrification. .. Since the molten glass flowing down the second portion is rapidly cooled to a temperature lower than the liquid phase temperature by the second space, devitrification can be suitably suppressed. By cooling in this way, the molten glass is adjusted to a viscosity suitable for molding while preventing devitrification.

In the present method, it is desirable that the second portion is provided with a metal on the surface or inside, and the metal is heated by electromagnetic induction in the molding step. The flow velocity of the molten glass flowing down the molded body is significantly reduced at the interface with the molded body. In the present invention, the interface of the molten glass can be heated by generating heat by electromagnetic induction of the metal provided in the second portion. As a result, the interface of the molten glass can be heated so as to be higher than the liquidus temperature, and devitrification of the interface can be prevented.

Not limited to the above, the second portion has a heating element inside, and in the molding step, the second portion may be heated by the heating element. As a result, the interface of the molten glass can be heated so as to be higher than the liquidus temperature.

In this method, it is desirable that the second portion is provided in the lower part of the molded body with a length of 10% or more and 50% or less with respect to the total height of the molded body.

Further, it is desirable that the first space and the second space are separated by a partition wall. As a result, the temperature control of the first space and the second space can be performed with high accuracy. In this case, it is desirable that the partition wall contains ceramic.

It is desirable that the molding step includes a step of cooling the second space. By cooling the second space, the molten glass passing through the second space through the second portion can be effectively cooled.

In this method, it is desirable that the forming step is to form a flat glass by an overflow down draw method.

Glass article produced in the present method may be constituted by a phosphate glass containing P ₂ O ₅ 25% or more by mass% as a composition.

The present invention is for solving the above-mentioned problems, and is an apparatus for manufacturing a glass article including a molded body in which molten glass flows down along a surface, and the molded body is a first portion on the upstream side. , A second portion on the downstream side is provided, and a first space in a high temperature atmosphere in which the first portion on the upstream side of the molded product is arranged and a second portion on the downstream side of the molded product are arranged. It is characterized by having a second space with a low temperature atmosphere.

According to the manufacturing apparatus having the above configuration, the molten glass flowing down the molded product is heated to a temperature higher than the liquid phase temperature in the first space, so that the first to second parts do not cause devitrification. Flow to. Since the molten glass flowing down the second portion is cooled to a temperature lower than the liquid phase temperature by the second space, devitrification can be suitably suppressed. By cooling in this way, the molten glass is adjusted to a viscosity suitable for molding while devitrification is prevented.

According to the present invention, it is possible to adjust the viscosity of the molten glass while preventing devitrification.

It is a front sectional view which shows the manufacturing apparatus of the glass article which concerns on 1st Embodiment. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. It is an enlarged cross-sectional view of a molded body. It is an enlarged cross-sectional view which shows the periphery of the lower end part of a molded body. It is a side sectional view which shows the manufacturing apparatus of the glass article which concerns on 2nd Embodiment. It is a side sectional view which shows the manufacturing apparatus of the glass article which concerns on 3rd Embodiment.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of a manufacturing method and a manufacturing apparatus for a glass article according to the present invention.

As shown in FIGS. 1 and 2, the manufacturing apparatus 1 includes a molding furnace 2 and a slow cooling furnace 3. The molding furnace 2 draws out the molded body 4 capable of performing the overflow down draw method, the furnace wall 5 covering the molded body 4, the cooling unit 6 arranged below the molded body 4, and the molten glass GM as a flat glass GR. It includes an edge roller 7.

The molded body 4 is formed in an elongated shape, and includes an overflow groove 8 formed along the longitudinal direction, and a vertical surface portion 9 and an inclined surface portion 10 that form a pair of side wall portions. In the molded body 4, the molten glass GM overflowing from the overflow groove 8 is allowed to flow down along the pair of side wall portions and fused at the lower end portion 11 thereof. The pair of inclined surface portions 10 intersect with each other by gradually approaching each other downward, and the intersecting portions form the lower end portion 11 of the molded body 4.

Further, the molded body 4 includes a molded body main body 12 and a metal film 13 that covers the molded body main body 12. The molded body 12 is made of a refractory material such as electroformed brick or dense zircon. The metal film 13 covers the entire outer surface of the molded body 12. The metal film 13 is made of a noble metal such as platinum or a platinum alloy. As the platinum alloy, for example, a platinum-rodium alloy, a platinum-iridium alloy, a platinum-gold alloy, or the like can be used. The thickness of the metal film 13 is 0.5 mm or more and 1.5 mm or less, but the thickness is not limited to this range.

As shown in FIGS. 1 to 3, the molded body 4 has an upper portion (upstream side) first portion 4a and a lower portion (downstream side) second portion 4b. The first portion 4a is a portion located inside the furnace wall 5 of the molding furnace 2, and the second portion 4b is a portion located inside the cooling portion 6. It is desirable that the length Ha (see FIG. 3) of the second portion 4b in the vertical direction is set to 10% or more and 50% or less of the total length (total height) H of the molded body 4 in the vertical direction.

The furnace wall 5 is made of a refractory material such as electroformed brick and dense zircon. The outer surface of the furnace wall 5 is covered with a metal casing (not shown). Inside the furnace wall 5, a space (hereinafter referred to as “first space”) S1 capable of accommodating the molded body 4 is formed. The first portion 4a of the molded body 4 is arranged in the first space S1. Further, in the first space S1, a heater 14 for heating the molten glass GM flowing down the molded body 4 is arranged. By heating the heater 14, the atmospheric temperature in the first space S1 is adjusted to be equal to or higher than the liquidus temperature of the plate glass GR, for example, 750 ° C. or higher and 1100 ° C. or lower.

The cooling unit 6 includes a space (hereinafter referred to as “second space”) S2 for accommodating the second portion 4b of the molded body 4. The second space S2 is partitioned by a side wall portion 15, a first partition wall 16, and a second partition wall 17. A device (heating device) 18 for heating the second portion 4b of the molded body 4 is arranged in the second space S2. A device (cooling device) 19 for cooling the second space S2 is arranged outside the second space S2.

The second portion 4b of the molded body 4 is arranged in the second space S2. That is, the second space S2 is a space for cooling the molten glass GM that travels along the inclined surface portion 10 of the second portion 4b of the molded body 4. The atmospheric temperature of the second space S2 is adjusted to 25 ° C. or higher and 200 ° C. or lower by the cooling device 19. The atmospheric temperature of the second space S2 is set to be 500 ° C. or more lower than the liquidus temperature of the molten glass GM. For example, it is desirable that the temperature of the second space S2 is set to room temperature. In the present specification, the normal temperature means 0 ° C. or higher and 40 ° C. or lower.

The side wall portion 15 is made of metal or a refractory material such as electroformed brick or dense zircon. The side wall portion 15 is formed in a cylindrical shape so as to surround the entire circumference of the second portion 4b of the molded body 4. The side wall portion 15 partitions the second space S2 together with the first partition wall 16 and the second partition wall 17.

The first partition wall 16 is a horizontal wall portion that separates the first space S1 and the second space S2. The first partition wall 16 has an opening 20 through which the second portion 4b of the molded body 4 can be inserted. The first partition wall 16 is configured to be movable in the horizontal direction, whereby the size of the opening 20 can be adjusted. The first partition wall 16 is formed of a ceramic such as cordierite or alumina in a plate shape. The portion of the first partition wall 16 located near the heating device 18 may be made of ceramic, and the other portion may be made of metal.

The second partition wall 17 is a horizontal wall portion for separating the second space S2 and the slow cooling furnace 3. The second partition wall 17 is formed of metal or ceramic in a plate shape. The second partition wall 17 has an opening 21 through which the flat glass GR formed by fusion molding by the molded body 4 is passed. The second partition wall 17 may be configured to be movable in the horizontal direction like the first partition wall 16.

The cooling device 19 is composed of a suction device such as a pump and a fan. The cooling device 19 is arranged outside the second space S2 (outside the side wall portion 15), and is connected to the second space S2 through a pipe. The cooling device 19 is not limited to this configuration, and may be configured by a device (air supply device) capable of supplying air for cooling to the second space S2, or a pipe is installed in the second space S2. , The structure may be such that a refrigerant (gas or liquid) flows through the pipe.

The heating device 18 has a coil 22 arranged so as to surround the second portion 4b of the molded body 4. As shown in FIG. 4, the coil 22 is formed of a metal in a tubular shape, and has a space inside which a refrigerant can flow. The refrigerant flowing through the coil 22 includes air and other gases, and water and other liquids. The heating device 18 causes a high-frequency current to flow through the coil 22 via a high-frequency power source (not shown) to generate a high-density eddy current in the metal film 13 of the molded body 4 by an electromagnetic induction action, thereby causing the metal film 13 to generate heat. ..

The edge roller 7 is for pulling out the molten glass GM as a flat glass GR having a predetermined width by gripping the end portion in the width direction of the molten glass GM falling from the molded body 4. As shown in FIGS. 1 and 2, the edge rollers 7 are configured as two left and right roller pairs in a front view so as to grip both ends of the flat glass GR in the width direction. Not limited to the illustrated example, the edge roller 7 may be configured as a plurality of stages in the vertical direction. Further, the edge roller 7 may be arranged in the slow cooling furnace 3.

The slow cooling furnace 3 is arranged below the cooling unit 6. The slow cooling furnace 3 has a plurality of stages of guide rollers 23 arranged at intervals in the vertical direction. The slow cooling furnace 3 slowly cools the flat glass GR descending through the cooling unit 6 to remove the internal strain thereof. That is, a plurality of heaters 24 are arranged in the slow cooling furnace 3 along the vertical direction, and each heater 24 forms a predetermined temperature gradient in the slow cooling furnace 3. As a result, in the slow cooling furnace 3, the temperature gradually decreases as the plate glass GR descends, and the internal strain of the plate glass GR is removed.

Hereinafter, a method of manufacturing a glass article using the manufacturing apparatus 1 of the above embodiment will be described. In this method, a case where flat glass GR is formed as a glass article by the overflow down draw method will be described.

Further, in this method, a case where a flat glass GR composed of glass having a low molding temperature, a large change in viscosity with respect to a unit temperature change, and a large coefficient of thermal expansion will be described. Specifically, a case of molding a flat glass GR composed of a phosphate-based glass will be described.

As an example of the composition of phosphate-based glass, in mass%, P ₂ O ₅ : 25% to 60%, Al 2 O _{3 : 2 to} 19%, RO (where R is Mg, Ca, Sr and At least one selected from Ba): 10 to 45%, ZnO: 0 to 13%, K ₂ O: 12 to 20% (however, 12% and 20% are not included), Na ₂ O: 0 to 12%. , And CuO: a composition containing 0.3 to 20%.

Further, as another example of the composition of the phosphate-based glass, P 5+: 5 to 50%, Al ³⁺ : 2 to 30%, R' ⁺ (however, R'is Li, Na, in ^{terms of cation%.} And K (at least one selected from): 10-40% and R ²⁺ (where R ²⁺ is at least one selected from ^{Mg 2+} , Ca ²⁺ , Sr ²⁺ , Ba ²⁺ , and Zn ^{2+): 20 Examples thereof include a composition containing F −} : 5 to 80% and O ² : 20 to 95% in terms of ~ 50% and anion%, and substantially free of Pb component and As component.

As the still another example of the composition of the phosphate type glass, in mole percent on the oxide _{basis, P 2 O 5: 5~40%} , SO 3: 1~35%, R '2 O ( where R'is Li, Na or K): 10 to 30%, RO (where R is Mg, Ca, Sr, Ba or Zn): 20 to 50%, and CuO + Fe ₂ O ₃ + CoO + CeO ₂ : 0. A composition containing 001 to 15% can be mentioned.

This method mainly includes a molding step of forming a plate glass GR by a molded body 4 and a slow cooling step of removing strain of the plate glass GR after the molding step.

In the molding step, the molten glass GM supplied to the molded body 4 in the molding furnace 2 overflows from the overflow groove 8 and flows down along the vertical surface portion 9 and the inclined surface portion 10. In the first space S1, the molten glass GM is heated to a temperature higher than the liquid phase temperature by heating the heater 14.

It is desirable that the molten glass GM flowing in the first space S1 is heated so as to be 50 ° C. or higher higher than the liquid phase temperature. The liquidus temperature of the molten glass GM in the present embodiment is 800 ° C., and the temperature of the molten glass GM in the first space S1 is 850 ° C. or higher. The viscosity of the molten glass GM in the first space S1 is 4.0 Pa · s. In the present specification, the “liquid phase temperature” refers to a temperature gradient in which glass powder that has passed through a standard sieve of 30 mesh (siege opening of 500 μm) and remains in 50 mesh (siege opening of 300 μm) is placed in a platinum boat. Refers to the temperature at which crystals precipitate after being kept in the furnace for 24 hours.

The molten glass GM flows down the inclined surface portion 10, passes through the opening 20 of the first partition wall 16, and enters the second space S2. The molten glass GM continues to flow down along the inclined surface portion 10 in the second portion 4b of the molded body 4.

The second space S2 rapidly cools the molten glass GM flowing down the inclined surface portion 10 corresponding to the second portion 4b to a temperature lower than the liquid phase temperature. Specifically, it is cooled at a cooling rate of −1 to −10 ° C./sec. In the present embodiment, the temperature of the surface layer in the cooled molten glass GM is about 500 ° C. or higher and 800 ° C. or lower. However, the interface IF between the molten glass GM and the inclined surface portion 10 of the second portion 4b is heated to a temperature higher than the liquid phase temperature.

As shown in FIG. 4, the molten glass GM flowing along the inclined surface portion 10 flows downward while forming a velocity distribution V. In this case, the flow velocity of the molten glass differs greatly between the surface layer side and the interface IF side. That is, the flow velocity of the interface IF of the molten glass GM is significantly reduced. Therefore, in order to prevent devitrification of the interface IF of the molten glass GM, the metal film 13 of the molded body 4 is heated by the heating device 18. By passing a high-frequency current through the coil 22, the heating device 18 causes a part of the metal film 13 (the part shown by cross-hatching in FIG. 4) located inside the coil 22 to generate heat due to electromagnetic induction. The metal film 13 in the second portion 4b heats the interface IF of the molten glass GM to a temperature higher than the liquid phase temperature by this heat. It is desirable that the interface IF of the molten glass GM in the present embodiment is heated to 850 ° C. or higher.

Further, in the molding step, the refrigerant flows inside the coil 22 in the heating device 18 to cool the coil 22. Since the cooled coil 22 is located near the molded body 4, the surface layer of the molten glass GM flowing down the inclined surface portion 10 of the second portion 4b can be cooled. That is, the coil 22 according to the heating device 18 has a function of cooling the surface layer of the molten glass GM in the cooling unit 6 while being a means for heating the metal film 13 of the molded body 4.

The molten glass GM that flows down the molten glass GM that has flowed down the pair of inclined surface portions 10 is fused and integrated at the lower end portion 11 of the molded body 4. The viscosity of the molten glass GM at the position of the lower end portion 11 is adjusted to 300 Pa · s or more by the cooling effect of the cooling portion 6. The fused molten glass GM is formed as a flat glass GR. Each end of the flat glass GR in the width direction is gripped by the edge roller 7, and is pulled downward by the rotation of the edge roller 7.

After that, the flat glass GR passes through the opening 21 of the second partition wall 17 and enters the slow cooling furnace 3. In the slow cooling step, the flat glass GR is slowly cooled according to a predetermined temperature gradient while being guided downward by the guide roller 23. As a result, the internal strain of the flat glass GR is removed.

After that, the flat glass GR is further cooled by natural cooling (cooling step) and cut to a predetermined size (cutting step). Alternatively, the flat glass GR is wound into a roll without being cut (winding step).

According to the method for manufacturing a glass article and the manufacturing apparatus 1 according to the present embodiment described above, the molten glass GM flowing down the molded body 4 is heated to a temperature higher than the liquidus temperature in the first space S1. It flows from the first portion 4a to the second portion 4b without causing devitrification. The molten glass GM flowing down the second portion 4b is rapidly cooled to a temperature lower than the liquid phase temperature by the second space S2, so that devitrification does not occur. Further, by heating the metal film 13 of the second portion 4b by the heating device 18, the interface IF of the molten glass GM flowing down the second portion 4b of the molded body 4 can be heated. By heating the interface IF of the molten glass GM so that the temperature is higher than the liquid phase temperature, devitrification of the interface IF can be prevented. As described above, the molten glass GM is adjusted to a viscosity suitable for molding while devitrification is prevented.

FIG. 5 shows a second embodiment of the present invention. In the present embodiment, the outer surface of the molded body 4 is not covered with the metal film 13. Further, a metal body 25 is provided inside the second portion 4b of the molded body 4. In the present embodiment, the metal body 25 located inside the molded body 4 is induced and heated by the heating device 18 (coil 22) to heat the inclined surface portion 10 in the second portion 4b of the molded body 4. As a result, the molded body 4 can heat the interface IF of the molten glass GM flowing down the second portion 4b to a temperature higher than the liquid phase temperature.

FIG. 6 shows a third embodiment of the present invention. In the present embodiment, the heating device 18 is provided inside the molded body 4. That is, the molded body 4 includes a heating element 18 that generates heat by energization inside the second portion 4b. In the present embodiment, by heating the inclined surface portion 10 in the second portion 4b by the heating element 18, the interface IF of the molten glass GM flowing down the inclined surface portion 10 can be heated to a temperature higher than the liquid phase temperature.

The present invention is not limited to the configuration of the above embodiment, and is not limited to the above-mentioned action and effect. The present invention can be modified in various ways without departing from the gist of the present invention.

In the above embodiment, an example of manufacturing the flat glass GR by the overflow down draw method is shown, but the present invention is not limited to this. The present invention can also be applied to the case where a glass tube is manufactured by the dunner method.

In the above embodiment, an example of manufacturing the flat glass GR from the phosphate-based glass has been shown, but the manufacturing apparatus 1 is not limited to this, and the flat glass GR of various materials can be manufactured. As the material of the flat glass GR to be manufactured, for example, silicate glass and silica glass are used, and more specifically, borosilicate glass, sodalime glass, aluminosilicate glass, chemically strengthened alkaline glass, and none. Alkaline glass, etc. can be mentioned. The non-alkali glass is a glass that does not substantially contain an alkaline component (alkali metal oxide), and specifically, a glass having a weight ratio of an alkaline component of 3000 ppm or less. ..

In addition to the above glass, the present invention can also be used for producing high refractive index glass suitable for applications such as organic EL. Such a high refractive index glass has, for example, in terms of glass composition, SiO _{20 to} 55%, Al ₂ O _{30 to} 10%, B ₂ O _{30 to} 20%, MgO + CaO + SrO (MgO, CaO, etc.) in terms of glass composition. and the total amount of _{SrO) 0~25%, BaO + TiO} 2 + Nb 2 O 5 + La 2 O 3 + Gd 2 O 3 + WO 3 + Ta 2 O 5 + ZrO 2 ( _{or, BaO + TiO 2 + Nb 2} O 5 + La 2 O 3 + ZnO + ZrO 2) 10 It is preferable to contain ~ 70% and Fe ₂ O _{30 to} 0.1% (however, 0.1% is not included).

1 Glass article manufacturing equipment 4 Molded body 4a First part 4b Second part 13 Metal film (metal)
16 First bulkhead (bulkhead)
GM molten glass GR flat glass (glass article)
S1 First space S2 Second space 25 Metal body (metal)

Claims (10)

It includes a molding step of forming a glass article by flowing molten glass along the surface of a molded body arranged in a molding furnace, and a slow cooling step of removing strain of the glass article by a slow cooling furnace after the molding step. In the manufacturing method of glass articles
The molded product includes a first portion on the upstream side and a second portion on the downstream side.
The first portion is arranged in a first space that heats the molten glass flowing down the first portion to a temperature higher than the liquid phase temperature.
The second portion is arranged in a second space that cools the molten glass that passes through the first portion and flows down the second portion to a temperature lower than the liquid phase temperature.
The molding furnace includes a first partition wall that separates the first space and the second space, and a second partition wall that is located below the first partition wall and separates the second space and the slow cooling furnace.
A method for manufacturing a glass article, which comprises setting the atmospheric temperature of the second space to room temperature by a cooling device in the molding step. The second part is provided with metal on the surface or inside.
The second part is surrounded by a coil and
In the molding step, the surface layer of the molten glass flowing down the second portion in the second space is cooled to a temperature lower than the liquidus temperature, a current is passed through the coil, and the metal is heated by electromagnetic induction. The method for producing a glass article according to claim 1, wherein the interface of the molten glass with the molded body is heated to a temperature higher than the liquidus temperature. The second part has a heating element inside and
The method for producing a glass article according to claim 1, wherein in the molding step, the second portion is heated by the heating element. The glass article according to any one of claims 1 to 3, wherein the second portion is provided in the lower part of the molded body with a length of 10% or more and 50% or less with respect to the total height of the molded body. Production method. The method for producing a glass article according to any one of claims 1 to 4, wherein the first partition wall contains ceramic. The method for manufacturing a glass article according to any one of claims 1 to 5, wherein the cooling device exhausts or supplies air to the second space. The method for producing a glass article according to any one of claims 1 to 6, wherein the molding step is a flat glass molding by an overflow down draw method. The glass article is composed of a phosphate glass containing P ₂ O ₅ 25% or more by mass% as a composition, method for producing a glass article according to any one of claims 1 to 7. An apparatus for manufacturing a glass article, comprising a molding furnace including a molded body in which molten glass flows down along a surface, and a slow cooling furnace arranged below the molding furnace.
The molded product includes a first portion on the upstream side and a second portion on the downstream side.
The molding furnace includes a first space having a high temperature atmosphere in which the first portion is arranged and a second space having a low temperature atmosphere in which the second portion is arranged.
The molding furnace includes a first partition wall that separates the first space and the second space, a second partition wall that is located below the first partition wall and separates the second space and the slow cooling furnace, and the second partition wall. A glass article manufacturing device including a cooling device that sets the atmospheric temperature of the space to room temperature. The second part is provided with metal on the surface or inside.
The second part is surrounded by a coil and
The molten glass is cooled to a temperature lower than the liquidus temperature on the surface layer of the molten glass flowing down the second portion in the second space, and a current is passed through the coil to heat the metal by electromagnetic induction. The apparatus for manufacturing a glass article according to claim 9, wherein the interface with the molded body is heated to a temperature higher than the liquidus temperature.

Images