CN112912348B - Method for manufacturing glass article - Google Patents
Method for manufacturing glass article Download PDFInfo
- Publication number
- CN112912348B CN112912348B CN201980070843.XA CN201980070843A CN112912348B CN 112912348 B CN112912348 B CN 112912348B CN 201980070843 A CN201980070843 A CN 201980070843A CN 112912348 B CN112912348 B CN 112912348B
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- China
- Prior art keywords
- tubular portion
- glass
- molten glass
- clarifier
- transfer tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000011521 glass Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000006060 molten glass Substances 0.000 claims abstract description 83
- 238000002844 melting Methods 0.000 claims abstract description 44
- 230000008018 melting Effects 0.000 claims abstract description 44
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 30
- 239000005357 flat glass Substances 0.000 description 19
- 229910052697 platinum Inorganic materials 0.000 description 15
- 239000000463 material Substances 0.000 description 10
- 238000009825 accumulation Methods 0.000 description 9
- 229910001260 Pt alloy Inorganic materials 0.000 description 6
- 238000000265 homogenisation Methods 0.000 description 6
- 230000000717 retained effect Effects 0.000 description 5
- 238000010583 slow cooling Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000005352 clarification Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000003280 down draw process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000006124 Pilkington process Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000005368 silicate glass Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000005345 chemically strengthened glass Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006025 fining agent Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- MUMZUERVLWJKNR-UHFFFAOYSA-N oxoplatinum Chemical compound [Pt]=O MUMZUERVLWJKNR-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910003446 platinum oxide Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/225—Refining
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/42—Details of construction of furnace walls, e.g. to prevent corrosion; Use of materials for furnace walls
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Glass Melting And Manufacturing (AREA)
Abstract
The method for manufacturing a glass article comprises the following steps: heating and melting a glass raw material in a melting tank (1) to generate molten Glass (GM); transferring the molten Glass (GM) flowing out from the outflow port (1 a) of the melting tank (1) in a transfer pipe (10); the molten Glass (GM) transferred from the transfer tube (10) is subjected to a fining treatment in a state where the tubular portion (7) of the fining tank (2) is filled with the molten Glass (GM). The transfer tube (10) is provided with: an upstream end (10 a) connected to the melting tank (1); and a downstream end (10 b) connected to the tubular part (7). The transfer tube (10) is connected to the tubular portion (7) such that the top (11 a) of the inner surface of the downstream end (10 b) coincides with the top (7 b) of the inner surface of the tubular portion (7).
Description
Technical Field
The present invention relates to a method for producing a glass article such as a sheet glass.
Background
As is well known, flat glass is used for flat panel displays such as liquid crystal displays and organic EL displays. As a method for producing the sheet glass, various forming methods such as a down-draw method and a float method are used.
For example, the sheet glass is formed into a plate shape by performing various steps such as a melting step, a fining step, a homogenizing step, and a shaping step. Patent document 1 discloses, as a manufacturing apparatus for performing the above-described steps, a manufacturing apparatus including a melting tank, a clarifying tank, a stirring tank, a forming apparatus, and a glass supply tube for connecting these components to each other. The clarifier tank and the glass supply tube are made of platinum material (platinum or platinum alloy) having a high melting point and excellent corrosion resistance. The clarifier tank is provided with a discharge port (vent pipe) for discharging gas generated from the molten glass.
Prior art literature
Patent literature
Patent document 1: JP-A2014-028734
Disclosure of Invention
Problems to be solved by the invention
Depending on the structure of the clarifier, the molten glass may be retained, and the gas generated from the molten glass may be stored in the clarifier without being discharged from the discharge port. If a gas pool is formed in the clarifier, oxidation of the platinum material constituting the clarifier proceeds and platinum oxide is mixed into the molten glass. As a result, irregularities such as irregularities are generated in the produced sheet glass, and the quality is lowered, resulting in defective products.
The cause of the occurrence of the gas accumulation will be described with reference to fig. 8. The clarifier tank C includes a tubular portion Ca and a flange portion F1 provided at an upstream end of the tubular portion Ca. The tubular portion Ca has a top Cb and a bottom Cc on its inner surface. The flange F1 is formed in a circular plate shape and has a circular opening O1. The diameter of the opening O1 is set smaller than the inner diameter of the tubular portion Ca. The opening O1 penetrates the flange F1 so that the lower end portion thereof coincides with the bottom Cc of the tubular portion Ca. The wall portion of the flange portion F1 closes the end portion of the tubular portion Ca at a portion above the opening portion O1. The interior of the clarifier tank C is filled with molten glass GM. That is, the liquid surface of the molten glass GM contacts the top Cb of the tubular portion Ca.
The transfer pipe P1 is connected to the upstream end of the clarifier C. The transfer pipe P1 has a flange F2 and a circular opening O2 at its downstream end. The transfer pipe P1 is connected to the clarifier tank C in a state where the flange F2 is brought into contact with the flange F1 of the clarifier tank C and the opening O2 is overlapped with the opening O1 of the clarifier tank C.
In the above-described configuration, the molten glass GM is likely to stay in the region between the top Cb and the wall of the flange F1 at the upstream end of the clarifier tank C. When the GAs generated from the molten glass GM floats up to reach the region where the molten glass GM stays, GAs accumulation GA is generated due to the GAs stagnation.
The present invention has been made in view of the above circumstances, and has as its technical problem to prevent occurrence of gas accumulation in the interior of a clarifier.
Means for solving the problems
In order to solve the above-described problems, the present invention provides a method for producing a glass article, comprising the steps of: heating and melting a glass raw material in a melting tank to produce molten glass; transferring the molten glass flowing out from the outflow port of the melting tank in a transfer pipe; and a process for producing a glass article, wherein the molten glass transferred from the transfer tube is subjected to a fining treatment in a state where a tubular portion of a fining tank is filled with the molten glass, the process comprising: an upstream end portion connected to the melting tank; and a downstream side end portion connected to the tubular portion, the transfer pipe being connected to the tubular portion such that a top portion of an inner face in the downstream side end portion coincides with a top portion of an inner face of the tubular portion.
According to the related structure, by matching the top of the inner surface of the transfer tube with the top of the inner surface of the tubular portion provided in the clarifier, the molten glass flowing from the transfer tube into the clarifier can flow along the top of the inner surface of the transfer tube and the top of the inner surface of the tubular portion without stagnation. Therefore, the gas generated from the molten glass can move in the clarifier tank along with the flow of the molten glass after floating. This prevents occurrence of gas accumulation.
The transfer pipe may be connected to the melting tank such that a top of the inner surface at the upstream end portion coincides with a top of the inner surface of the outflow port, and a bottom of the inner surface at the upstream end portion coincides with a bottom of the inner surface of the outflow port. This allows molten glass to flow from the melting tank to the transfer tube without stagnation.
The transfer pipe may be connected to the tubular portion such that a bottom of the inner surface of the downstream end portion coincides with a bottom of the inner surface of the tubular portion. Here, when the inner diameter of the tubular portion of the clarifier tank is larger than the inner diameter of the transfer pipe, the bottom of the inner surface of the tubular portion does not coincide with the bottom of the inner surface at the downstream end portion, and therefore, molten glass tends to stagnate around the bottom of the inner surface of the tubular portion. For example, by making the inner diameter of the transfer tube and the inner diameter of the tubular portion substantially equal to each other, the bottom of the inner surface of the tubular portion and the bottom of the inner surface at the downstream end portion are made to coincide with each other, so that molten glass can be prevented from stagnating around the bottom of the inner surface of the tubular portion.
The transfer tube may include: an expanded portion having an inner diameter gradually increasing toward the downstream end portion. The transfer tube can thereby make the bottom of the inner surface of the downstream end portion coincide with the bottom of the inner surface of the tubular portion even when the inner diameter of the tubular portion of the clarifier tank is larger than the inner diameter of the transfer tube, and can prevent molten glass from stagnating around the bottom of the inner surface of the tubular portion. In addition, in the existing equipment with different diameters of the outflow opening and the inner diameter of the tubular part of the clarifying tank, the occurrence of gas accumulation in the interior of the clarifying tank can be prevented by only changing the transfer pipe.
The transfer pipe may be formed in a straight pipe shape, and the transfer pipe may be connected to the pipe portion such that a bottom portion of the inner surface of the downstream end portion is higher than a bottom portion of the inner surface of the pipe portion. Here, the outer surface of the transfer tube is supported by the refractory, but if the transfer tube has an enlarged diameter portion as described above, a gap tends to be generated between the refractory and the transfer tube because the thermal expansion amounts of the transfer tube and the refractory are different. For this reason, the transfer tube may be deformed or broken, and the period (lifetime) during which the transfer tube can be used may be shortened. By using a transfer tube having a straight tubular shape, the outer surface of the transfer tube can be easily supported, and the period during which the transfer tube can be used can be maintained. In addition, an increase in the manufacturing cost of the transfer tube can be suppressed. Further, in the conventional equipment in which the diameter of the outflow port and the inner diameter of the tubular portion of the clarifier are different, the occurrence of gas accumulation in the interior of the clarifier can be prevented by merely changing the transfer pipe.
The method can comprise the following steps: heating is performed in a state where the transfer tube and the tubular portion are separated. By heating the transfer tube and the tubular portion of the clarifier tank in a state separated from each other, the transfer tube and the tubular portion of the clarifier tank can be inflated in advance. By connecting the transfer tube and the tubular portion of the clarifier after expanding, expansion of the tubular portion of the clarifier and the transfer tube during clarification can be prevented, and deformation due to thermal stress can be prevented.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the occurrence of gas accumulation in the interior of the clarifier can be prevented.
Drawings
Fig. 1 is a side view showing an apparatus for manufacturing a glass article according to a first embodiment.
FIG. 2 is a sectional view of a melting tank, a clarifying tank, and a transfer pipe.
Fig. 3 is a view showing an upstream end of the clarifier and a downstream end of the transfer pipe.
Fig. 4 is a flowchart of a method for manufacturing a glass article.
FIG. 5 is a sectional view showing the transfer pipe and the clarifier in the preheating step.
FIG. 6 is a sectional view of a melting tank, a clarifying tank, and a transfer pipe according to the second embodiment.
Fig. 7 is a cross-sectional view of the clarifier and the transfer pipe according to the third embodiment.
Fig. 8 is a sectional view illustrating the principle of occurrence of gas accumulation.
Detailed Description
The mode for carrying out the invention is described below with reference to the drawings. Fig. 1 to 5 show a first embodiment of a method and an apparatus for manufacturing a glass article according to the present invention.
As shown in fig. 1, the apparatus for producing a glass article according to the present embodiment includes, in order from the upstream side, a melting tank 1, a clarifying tank 2, a homogenizing tank (stirring tank) 3, a crucible (pot) 4, a forming body 5, and glass supply paths 6a to 6d connecting these components 1 to 5. The manufacturing apparatus further includes a slow cooling furnace (not shown) for slowly cooling the plate glass GR (glass article) formed by the forming body 5, and a cutting device (not shown) for cutting the plate glass GR after the slow cooling.
The melting tank 1 is a vessel for performing a melting step of melting a glass raw material charged by heating to obtain molten glass GM. The melting tank 1 is connected to the clearing tank 2 through a glass supply path 6 a. As shown in fig. 2, the melting tank 1 has an outflow port 1a for supplying the molten glass GM to the glass supply passage 6 a. The outflow port 1a is a circular hole penetrating the wall portion 1b.
The clarifier tank 2 carries out a clarification step (clarification treatment) of defoaming by the action of a clarifier or the like while transferring the molten glass GM. The clarifier tank 2 is connected to the homogenizer tank 3 via a glass supply path 6 b. The clarifier 2 is formed in a tubular shape of a platinum material (platinum or platinum alloy). As shown in fig. 2, the clarifier 2 includes a tubular portion 7 and flange portions 8a and 8b provided at both end portions of the tubular portion 7.
In fig. 2, reference symbol F indicates the direction in which the molten glass GM flows. In the following, when explaining the positions of the respective constituent elements, the terms "upstream side" and "downstream side" are used based on the direction F in which the molten glass GM flows.
The tubular portion 7 is a circular tube, but is not limited to this configuration. The inner diameter of the tubular portion 7 is desirably set to 100mm to 300 mm. The wall thickness of the tubular portion 7 is desirably set to 0.3mm or more and 3mm or less. The length of the tubular portion 7 is desirably 300mm to 10000 mm. These dimensions are not limited to the above-described ranges, and are appropriately set in accordance with the type of the molten glass GM, the temperature, the scale of the manufacturing apparatus, and the like.
The clarifier tank 2 includes a discharge port 7a at the top of the tubular portion 7 for discharging gas generated in the molten glass GM. The clarifier tank 2 may include a partition plate (baffle plate) for changing the direction in which the molten glass GM flows in the tubular portion 7.
As shown in fig. 1 and 2, the liquid surface GS of the molten glass GM in the melting tank 1 is set at a position above the top (apex) 7b of the inner surface of the tubular portion 7 or at the same position as the top 7b. The height difference H is set to 0mm to 200mm, but is not limited to this range. By this setting, the inner space of the tubular portion 7 is entirely filled with the molten glass GM flowing in from the melting tank 1. That is, the upper inner surface of the tubular portion 7 and the molten glass GM are not separated from each other in the tubular portion 7, and the molten glass GM is in contact with all of the inner surfaces (see fig. 2). In this way, by contacting the molten glass GM on all of the inner surfaces of the tubular portion 7, a gas phase space is not formed in the tubular portion 7, and oxidation of the inner surfaces of the tubular portion 7 can be prevented. The positions of all the transfer pipes constituting the glass supply paths 6a to 6d are set below the liquid surface GS of the molten glass GM.
The flange portions 8a and 8b of the clarifier 2 are circular, but are not limited to this shape. Plate-like protrusions for supporting the electrodes may be formed on the upper portions of the flange portions 8a and 8b. The flange portions 8a and 8b are connected to a power supply device (not shown). The clarifier tank 2 heats the molten glass GM flowing inside the tubular portion 7 by resistance heating (joule heat) generated by current flowing through the tubular portion 7 via the flange portions 8a and 8b.
The flange portions 8a and 8b of the clarifier 2 include: a first flange portion 8a provided at the upstream side end portion 2a of the tubular portion 7; and a second flange portion 8b provided at the downstream end portion 2b of the clarifier 2 (the tubular portion 7). The first flange portion 8a has a first opening 9a through which the molten glass GM flows into the tubular portion 7. The second flange portion 8b has a second opening 9b through which the molten glass GM flows out of the tubular portion 7. The first opening 9a and the second opening 9b are formed in a circular shape. The diameter of each opening 9a, 9b is set smaller than the inner diameter of the tubular portion 7.
As shown in fig. 2 and 3, the first opening 9a is formed corresponding to the upper portion of the tubular portion 7. That is, the uppermost portion (hereinafter referred to as "upper end portion" and the same applies to the other openings) 9aU of the first opening 9a coincides with the top portion 7b of the inner surface of the tubular portion 7. Similarly, the second opening 9b is formed corresponding to the upper portion of the tubular portion 7. The upper end 9bU of the second opening 9b coincides with the top 7b in the inner surface of the tubular portion 7.
The glass supply path 6a connecting the melting tank 1 and the clarifying tank 2 includes a transfer pipe made of a platinum material (platinum or platinum alloy). The transfer tube 10 has: a tubular portion 11; and flange portions 12a, 12b provided at both end portions 10a, 10b of the transfer tube 10. Each flange portion 12a, 12b includes: a first flange 12a formed at the upstream end 10a of the transfer tube 10; and a second flange portion 12b formed at the downstream side end portion 10 b.
The inner diameter of the tubular portion 11 of the transfer tube 10 is desirably 100mm to 300 mm. The wall thickness of the tubular portion 11 is desirably set to 0.3mm or more and 3mm or less. These dimensions are not limited to the above-described ranges, and are appropriately set in accordance with the type of the molten glass GM, the temperature, the scale of the manufacturing apparatus, and the like. In the present embodiment, the inner diameter D of the tubular portion 11 is set smaller than the inner diameter of the tubular portion 7 of the clarifier 2. The tubular portion 11 is inclined upward from the melting tank 1 toward the settling tank 2. The inclination angle of the tubular portion 11 with respect to the horizontal direction is set to, for example, 3 ° or more and 30 ° or less.
The first flange 12a of the transfer tube 10 contacts the wall 1b of the melting tank 1, and the second flange 12b opposes and contacts the first flange 8a of the clarifying tank 2. The flange portions 12a and 12b have openings 13a and 13b. The openings 13a and 13b are formed in an elliptical shape long in the up-down direction. The length DL of the major axis of each opening 13a, 13b is substantially equal to the inner diameter D of the tubular portion 11. Here, "substantially equal" means that the length DL of the major axis is 90% to 110% of the inner diameter D of the tubular portion 11.
The opening 13a of the first flange 12a overlaps the outflow port 1a of the melting tank 1. The opening area of the opening 13a is set smaller than the opening area of the outflow port 1a. The length DL of the major axis of the opening 13a of the first flange 12a is substantially equal to the diameter of the outflow port 1a. Here, "substantially equal" means that the length DL of the major axis is 90% to 110% of the diameter of the outflow port 1a.
As shown in fig. 2, the top 11a of the inner surface of the upstream end 10a of the transfer tube 10 coincides with the top of the inner surface of the outflow port 1a of the melting tank 1. That is, the upper end portion 13aU of the opening portion 13a of the transfer tube 10 coincides with the upper end portion 1aU of the outflow port 1a. The bottom 11b of the inner surface of the upstream end 10a of the transfer tube 10 coincides with the bottom of the outflow port 1a. That is, the lower end portion 13aD of the opening portion 13a of the transfer tube 10 coincides with the lower end portion 1aD of the outflow port 1a.
The opening 13b of the second flange 12b overlaps the first opening 9a of the first flange 8a of the clarifier 2. The opening area of the opening 13b is set smaller than the opening area of the first opening 9a of the clarifier 2. The length DL of the long axis of the opening 13b is substantially equal to the diameter of the first opening 9a of the clarifier 2. That is, the length DL of the long axis is set to 90% to 110% of the diameter of the first opening 9a.
The top 11a of the inner surface of the transfer tube 10 at the downstream end 10b coincides with the top 7b of the inner surface of the clarifier 2. That is, the upper end 13bU of the opening 13b in the downstream end 10b of the transfer tube 10 coincides with the upper end 9aU of the first opening 9a of the clarifier 2. The lower end portion 13bD of the opening 13b of the transfer tube 10 coincides with the lower end portion 9aD of the first opening 9a of the clarifier 2.
The glass supply path 6b connecting the clarifying tank 2 and the homogenizing tank 3 includes a transfer pipe made of a platinum material (platinum or platinum alloy). The transfer pipe 14 is formed in a straight pipe shape and is connected to the downstream end 2b of the clarifier 2. As shown in fig. 2, the transfer tube 14 includes: a tubular portion 15; and flange portions 16a and 16b and opening portions 17a and 17b provided at both end portions 14a and 14b of the transfer tube 14.
The inner diameter of the tubular portion 15 of the transfer tube 14 is desirably 100mm to 300 mm. The wall thickness of the tubular portion 15 is desirably set to 0.3mm or more and 3mm or less. These dimensions are not limited to the above-described ranges, and are suitable in accordance with the type of the molten glass GM, the temperature, the scale of the manufacturing apparatus, and the like. In the present embodiment, the inner diameter of the tubular portion 15 is set smaller than the inner diameter of the tubular portion 7 of the clarifier 2.
The flange portions 16a and 16b are formed in a circular plate shape. The openings 17a and 17b are formed in a circular shape. The opening areas of the openings 17a and 17b are substantially equal to the opening area of the second opening 9b in the second flange portion 8b of the clarifier 2. According to this configuration, the entire periphery of the opening 17a in the upstream end 14a of the transfer pipe 14 is arranged to coincide with the entire periphery of the second opening 9b of the clarifier 2.
The flange portions 12a, 12b, 16a, 16b of the transfer pipes 10, 14 are connected to a power supply device (not shown). In the glass supply paths 6a and 6b, similarly to the clarifier tank 2, the molten glass GM flowing through the transfer pipes 10 and 14 is heated by resistance heating (joule heat) generated by current flowing through the tubular portions 11 and 15 via the flange portions 12a, 12b, 16a and 16b (the same applies to the other glass supply paths 6c and 6 d).
The homogenization tank 3 is a vessel made of a platinum material for performing a process (homogenization process) of stirring and homogenizing the molten glass GM subjected to the fining process. The homogenizing tank 3 is provided with a stirrer 3a having stirring wings. The homogenization tank 3 is connected to the crucible 4 via a glass supply path 6 c. The glass supply path 6c includes a transfer tube made of a platinum material (platinum or platinum alloy) similar to the glass supply paths 6a and 6 b.
The crucible 4 is a container for performing a state adjustment process for adjusting the molten glass GM to a state suitable for molding. The crucible 4 is exemplified as a volume portion for viscosity adjustment and flow rate adjustment of the molten glass GM. The crucible 4 is connected to the forming body 5 through a glass supply path 6d. The glass supply path 6d includes a transfer tube made of a platinum material (platinum or platinum alloy) similar to the glass supply paths 6a to 6 c.
The forming body 5 forms the molten glass GM into a desired shape. In the present embodiment, the forming body 5 forms the molten glass GM into a plate shape by the overflow downdraw method. Specifically, the cross-sectional shape (cross-sectional shape perpendicular to the paper surface of fig. 1) of the molded body 5 is formed in a substantially wedge shape, and an overflow groove (not shown) is formed in an upper portion of the molded body 5.
The forming body 5 overflows the molten glass GM from the overflow trough and flows down along the side wall surfaces (the surfaces on the front and rear sides of the paper surface) of both sides of the forming body 5. The forming body 5 merges the molten glass GM flowing down at the lower top of the side wall surface. Thereby forming a ribbon-shaped plate glass GR. The molded body 5 may be a molded body that performs another downdraw process such as a slot downdraw process. In addition, a forming device using a float process may be provided instead of the forming body 5.
The flat glass GR thus obtained has a thickness of, for example, 0.01 to 10mm, and is used for a flat display such as a liquid crystal display or an organic EL display, a substrate such as an organic EL lighting or a solar cell, or a protective cover. The glass article according to the present invention is not limited to the plate glass GR, and includes glass tubes and other articles having various shapes. For example, in the case of forming a glass tube, a forming device using the danner method is provided instead of the forming body 5.
Silicate glass and silica glass are used as the material of the plate glass GR, borosilicate glass, soda lime glass, alumina silicate glass, and chemically strengthened glass are preferably used, and alkali-free glass is most preferably used. Here, the alkali-free glass means a glass substantially free of alkali components (alkali metal oxides), and specifically, a glass having a weight ratio of alkali components of 3000ppm or less. The weight ratio of the alkali component in the present invention is preferably 1000ppm or less, more preferably 500ppm or less, and most preferably 300ppm or less.
The method for producing a glass article (flat glass GR) using the production apparatus having the above-described structure will be described below. As shown in fig. 4, the method mainly includes a preheating step S1, an assembling step S2, a melting step S3, a molten glass supply step S4, a forming step S5, a slow cooling step S6, and a cutting step S7.
In the preheating step S1, the components 1 to 5 and 6a to 6d of the manufacturing apparatus are heated while being separated from each other. Fig. 5 shows a state in which the transfer pipe 10 and the clarifier 2 are separated, for example. In the preheating step S1, the outflow port 1a of the melting tank 1 is blocked by a blocking member. The components 1 to 5 and 6a to 6d are heated to a predetermined temperature in the preheating step S1. By this heating, the platinum material portion expands among the constituent elements 1 to 5 and 6a to 6d. For example, the tubular portion 7 of the clarifier tank 2 and the tubular portion 11 of the transfer pipe 10 are expanded in the longitudinal direction thereof as indicated by two-dot chain lines in fig. 5.
In the assembling step S2, the manufacturing apparatus is assembled by connecting the separated constituent elements 1 to 5 and 6a to 6d to each other. For example, an upstream end 10a of the transfer tube 10 is connected to the outflow port 1a of the melting tank 1. Specifically, the first flange 12a of the transfer tube 10 is brought into contact with the wall 1b of the melting tank 1, and the opening 13a is overlapped with the outflow port 1a.
Next, the downstream end portion 10b of the transfer pipe 10 is connected to the upstream end portion 2a of the clarifier 2. That is, the second flange 12b of the transfer tube 10 and the first flange 8a of the clarifier tank 2 are opposed to each other and are in contact with each other. At this time, the flange portions 8a and 12b are overlapped so that the upper end portion 9aU of the first opening 9a of the clarifier tank 2 coincides with the upper end portion 13bU of the opening 13b of the transfer pipe 10.
Then, the transfer pipe 14 is connected to the clarifier 2. That is, the flange 16a of the transfer tube 14 and the second flange 8b of the clarifier tank 2 are opposed to each other and are in contact with each other. At this time, the flange portions 8b and 16a are overlapped so that the opening 17a in the transfer pipe 14 coincides with the second opening 9b in the clarifier tank 2.
Further, the manufacturing apparatus is assembled by connecting the homogenization tank 3, the crucible 4, the forming body 5, and the glass supply paths 6c and 6d.
In the melting step S3, the glass raw material supplied into the melting tank 1 is heated to generate molten glass GM. In order to shorten the start-up period of the manufacturing apparatus, the molten glass GM may be previously formed in the melting tank 1 before the assembly step S2.
In the molten glass supply step S4, the molten glass GM in the melting tank 1 is sequentially transferred to the clarifying tank 2, the homogenizing tank 3, the crucible 4, and the forming body 5 via the glass supply paths 6a to 6d. In the molten glass supply step S4, when the molten glass GM flows through the tubular portion 7 of the fining tank 2, a gas (bubble) is generated from the molten glass GM by the action of the fining agent mixed with the glass raw material. The gas is discharged from the discharge port 7a of the clarifier 2 to the outside (clarifier step). In the homogenization tank 3, the molten glass GM is stirred and homogenized (homogenization step). When the molten glass GM passes through the crucible 4 and the glass supply path 6d, the state (for example, viscosity and flow rate) thereof is adjusted (state adjustment step).
In the forming step S5, the molten glass GM is supplied to the forming body 5 through the molten glass supply step S4. The forming body 5 causes the molten glass GM to flow down along the side wall surface thereof in order from the overflow trough. The forming body 5 is formed into a strip-shaped sheet glass GR by fusing the molten glass GM flowing down at the lower top.
Thereafter, the strip-shaped sheet glass GR is cooled by a slow cooling furnace in a slow cooling step S6, and is cut by a cutting device in a cutting step S7. Thus, a sheet glass (glass article) of a predetermined size is cut out from the strip-shaped sheet glass GR. Alternatively, after both ends of the sheet glass GR in the width direction are removed in the cutting step S7, the strip-shaped sheet glass GR may be wound into a roll shape to obtain a glass roll as a glass article (winding step).
According to the method for producing glass articles according to the present embodiment described above, the top 11a of the inner surface (the upper end 13bU of the opening 13 b) of the downstream side end 10b of the transfer tube 10 and the top 7b of the inner surface (the upper end 9aU of the first opening 9 a) of the upstream side end 2a of the clarifier 2 are aligned with each other in the state where the transfer tube 10 and the clarifier 2 are connected, so that the molten glass GM flowing into the clarifier 2 from the transfer tube 10 can flow along the top 11a of the transfer tube 10 and the top 7b of the clarifier 2 without being retained. Therefore, the gas generated from the molten glass GM moves in the clarifier 2 without causing the gas accumulation along with the flow of the molten glass GM, and is reliably discharged from the discharge port 7a. Even if gas is generated from the molten glass GM around the bottom 7c of the clarifier 2, the gas floats up, and the molten glass GM moves in the clarifier 2 along with the flow of the molten glass GM, and is reliably discharged from the discharge port 7a.
Here, in the manufacturing apparatus according to the first embodiment, the molten glass GM is likely to stay around the bottom 7c of the settling tank 2, and particularly, the molten glass GM is likely to stay around the bottom 7c at the upstream end 2a of the settling tank 2. In this case, there is a possibility that the retained molten glass GM may be modified. From the viewpoint of preventing this, the second embodiment or the third embodiment described later is preferably employed.
Fig. 6 shows a part of a manufacturing apparatus according to a second embodiment. In the manufacturing apparatus according to the present embodiment, the tubular portion 11 of the transfer tube 10 includes a straight tubular first tubular portion 11A and a tapered second tubular portion 11B. The first tubular portion 11A is formed on the upstream end portion 10a side of the transfer tube 10 and connected to the melting tank 1. The second tubular portion 11B is formed on the downstream end portion 10B side of the transfer tube 10 and connected to the clarifier 2.
The second tubular portion 11B includes an enlarged diameter portion having an inner diameter gradually increasing from the middle portion of the transfer tube 10 toward the downstream end portion 10B. According to this structure, the opening 13b of the downstream end 10b of the transfer tube 10 is formed in a circular shape.
The inner diameter of the second tubular portion 11B in the downstream end portion 10B of the transfer pipe 10 is substantially equal to the inner diameter of the tubular portion 7 of the clarifier 2. That is, the diameter of the opening 13b of the downstream end portion 10b of the transfer tube 10 is 90% to 110% of the inner diameter of the tubular portion 7 of the clarifier 2. The diameter of the first opening 9a formed in the first flange 8a of the clarifier tank 2 is substantially equal to the inner diameter of the tubular portion 7. According to this structure, the bottom portion 13bD of the opening portion 13B of the second tubular portion 11B of the transfer tube 10 coincides with the bottom portion 9aD of the first opening portion 9a of the upstream side end portion 2a of the clarifier 2. Accordingly, the molten glass GM flowing from the transfer pipe 10 into the clarifier 2 flows along the top 11a of the transfer pipe 10 and the top 7b of the clarifier 2, and flows along the bottom 11b of the transfer pipe 10 and the bottom 7c of the clarifier 2, without being retained.
Fig. 7 shows a part of a manufacturing apparatus according to a third embodiment. In the second embodiment described above, the second tubular portion 11B of the transfer tube 10 is configured as an expanded diameter portion, but the second tubular portion 11B of the transfer tube 10 according to the present embodiment is configured as a straight tubular shape with a fixed inner diameter.
The opening 13B of the downstream end portion 10B of the transfer tube 10 (second tubular portion 11B) is formed in an oval shape long in the up-down direction as in the first embodiment. In the third embodiment, unlike the first embodiment, the length DL of the long axis in the opening 13b is substantially equal to the inner diameter of the tubular portion 7 of the clarifier 2. For this reason, in the present embodiment, the bottom portion 13bD of the opening portion 13B of the second tubular portion 11B of the transfer tube 10 coincides with the bottom portion 9aD of the first opening portion 9a of the upstream side end portion 2a of the clarifier 2. Therefore, the molten glass GM flowing from the transfer pipe 10 into the clarifier 2 flows along the top 11a of the transfer pipe 10 and the top 7b of the clarifier 2, and also flows along the bottom 11b of the transfer pipe 10 and the bottom 7c of the clarifier 2, without being retained.
The present invention is not limited to the configuration of the above embodiment, and is not limited to the above operation and effects. The present invention can be variously modified within a range not departing from the gist of the present invention.
In the second embodiment described above, the example in which the diameter-enlarged portion (the second tubular portion 11B) is provided in the range from the middle portion of the transfer tube 10 to the downstream end portion 10B has been shown, but the present invention is not limited to this configuration. For example, the tubular portion 11 may be formed as an enlarged diameter portion from the upstream end portion 10a of the transfer tube 10 over the entire length of the downstream end portion 10 b.
Description of the reference numerals
1. Melting tank
1a flow outlet
Upper end (top) of 1aU outflow port
2. Clarifying tank
7. Tubular portion
7b top of inner face of tubular portion
10. Transfer tube
10a upstream side end portion
10b downstream end portion
11a top of inner face of transfer tube
11B second tubular portion (diameter-enlarging portion)
GM molten glass
GR flat glass (glass articles)
S1 preheating procedure
S3 melting step
S4 molten glass supply step
Claims (3)
1. A method for manufacturing a glass article, comprising the steps of:
heating and melting a glass raw material in a melting tank to produce molten glass;
transferring the molten glass flowing out from the outflow port of the melting tank in a transfer pipe; and
subjecting the molten glass transferred from the transfer tube to a fining treatment in a state where a tube-like portion of a fining tank is filled with the molten glass,
the method for manufacturing a glass article is characterized in that,
the transfer tube is provided with: an upstream end portion connected to the melting tank; and a downstream end portion connected to the tubular portion,
the transfer pipe is connected to the tubular portion such that a top of an inner face in the downstream side end portion coincides with a top of an inner face of the tubular portion,
the transfer tube is formed in a straight tube shape, and is connected to the tube-shaped portion such that a bottom portion of an inner surface of the downstream end portion is higher than a bottom portion of an inner surface of the tube-shaped portion,
the molten glass is caused to flow along the top of the inner surface of the downstream end portion of the transfer tube and the top of the inner surface of the tubular portion.
2. The method for producing a glass article according to claim 1, wherein,
the transfer pipe is connected to the melting tank such that a top of an inner face in the upstream-side end portion coincides with a top of an inner face of the outflow port, and a bottom of the inner face in the upstream-side end portion coincides with a bottom of the inner face of the outflow port.
3. The method for producing a glass article according to claim 1 or 2, wherein,
the method for manufacturing the glass article comprises the following steps:
heating is performed in a state where the transfer tube and the tubular portion are separated.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-239407 | 2018-12-21 | ||
| JP2018239407A JP7092021B2 (en) | 2018-12-21 | 2018-12-21 | Manufacturing method of glass articles |
| PCT/JP2019/045474 WO2020129528A1 (en) | 2018-12-21 | 2019-11-20 | Method for manufacturing glass article |
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| Publication Number | Publication Date |
|---|---|
| CN112912348A CN112912348A (en) | 2021-06-04 |
| CN112912348B true CN112912348B (en) | 2023-11-14 |
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| CN201980070843.XA Active CN112912348B (en) | 2018-12-21 | 2019-11-20 | Method for manufacturing glass article |
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| Country | Link |
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| JP (1) | JP7092021B2 (en) |
| KR (1) | KR102655115B1 (en) |
| CN (1) | CN112912348B (en) |
| WO (1) | WO2020129528A1 (en) |
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| JP2022050001A (en) * | 2020-09-17 | 2022-03-30 | 日本電気硝子株式会社 | Glass plate production method and production device |
| JP7319316B2 (en) * | 2021-03-29 | 2023-08-01 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass substrate equipment |
| WO2024038740A1 (en) * | 2022-08-19 | 2024-02-22 | 日本電気硝子株式会社 | Method for manufacturing glass article, and device for manufacturing glass article |
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2018
- 2018-12-21 JP JP2018239407A patent/JP7092021B2/en active Active
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2019
- 2019-11-20 WO PCT/JP2019/045474 patent/WO2020129528A1/en active Application Filing
- 2019-11-20 CN CN201980070843.XA patent/CN112912348B/en active Active
- 2019-11-20 KR KR1020217014817A patent/KR102655115B1/en active IP Right Grant
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112912348A (en) | 2021-06-04 |
| KR102655115B1 (en) | 2024-04-08 |
| JP7092021B2 (en) | 2022-06-28 |
| WO2020129528A1 (en) | 2020-06-25 |
| JP2020100531A (en) | 2020-07-02 |
| KR20210101209A (en) | 2021-08-18 |
| TW202108516A (en) | 2021-03-01 |
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