CN112912348A - Method for manufacturing glass article - Google Patents
Method for manufacturing glass article Download PDFInfo
- Publication number
- CN112912348A CN112912348A CN201980070843.XA CN201980070843A CN112912348A CN 112912348 A CN112912348 A CN 112912348A CN 201980070843 A CN201980070843 A CN 201980070843A CN 112912348 A CN112912348 A CN 112912348A
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- China
- Prior art keywords
- tubular portion
- glass
- transport pipe
- molten glass
- tank
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- 239000011521 glass Substances 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000006060 molten glass Substances 0.000 claims abstract description 81
- 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
- 238000007670 refining Methods 0.000 claims description 4
- 238000005352 clarification Methods 0.000 description 58
- 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 9
- 238000009825 accumulation Methods 0.000 description 8
- 229910001260 Pt alloy Inorganic materials 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 6
- 230000000717 retained effect Effects 0.000 description 6
- 238000010583 slow cooling Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 238000003280 down draw process Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000465 moulding Methods 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
- 239000006025 fining agent Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 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
- 230000005856 abnormality Effects 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
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000005345 chemically strengthened glass Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction 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
- 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
Images
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
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 produce molten Glass (GM); transferring the molten Glass (GM) flowing out from the outlet (1a) of the melting tank (1) in a transfer pipe (10); the molten Glass (GM) transferred from the transfer pipe (10) is subjected to a fining process in a state where the tubular portion (7) of the fining vessel (2) is filled with the molten Glass (GM). The transport pipe (10) is provided with: an upstream end portion (10a) connected to the melting tank (1); and a downstream end (10b) connected to the tubular portion (7). The transport pipe (10) is connected to the tubular part (7) such that the top (11a) of the inner surface of the downstream-side end part (10b) coincides with the top (7b) of the inner surface of the tubular part (7).
Description
Technical Field
The present invention relates to a method for manufacturing a glass article such as a plate 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 a flat glass, various forming methods such as a down-draw method and a float method are used.
For example, a sheet glass is formed into a sheet shape through various steps such as a melting step, a refining step, a homogenizing step, and a forming 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 pipe connecting these components to each other. The clarifier and the glass supply tube are made of a platinum material (platinum or a 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.
Documents of the prior art
Patent document
Patent document 1: JP 2014-028734 publication
Disclosure of Invention
Problems to be solved by the invention
Depending on the structure of the clarifier, molten glass may be retained, and gas generated from the molten glass may be stored in the clarifier without being discharged from the discharge port. When a gas pool is formed in the fining vessel, the platinum material constituting the fining vessel is oxidized and platinum oxide is mixed into the molten glass. As a result, abnormalities such as concave and convex dots occur in the produced plate glass, which leads to a reduction in quality and product failure.
The cause of gas accumulation will be described with reference to fig. 8. The clarification tank C includes a tubular portion Ca and a flange portion F1 provided at the upstream end of the tubular portion Ca. The tubular portion Ca has a top Cb and a bottom Cc on its inner face. The flange portion F1 is formed in a disc 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 such that the lower end thereof coincides with the bottom Cc of the tubular portion Ca. The wall of the flange F1 closes the end of the tubular portion Ca at a portion above the opening O1. The interior of the clarifying 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 clarifying tank C. The transport pipe P1 has a flange F2 and a circular opening O2 at its downstream end. The transport pipe P1 is connected to the clarification tank C with the flange F2 in contact with the flange F1 of the clarification tank C and the opening O2 overlapping the opening O1 of the clarification tank C.
In the above configuration, the molten glass GM is likely to accumulate in the region between the ceiling Cb of the upstream end of the clarifying tank C and the wall of the flange F1. When the GAs generated from the molten glass GM floats up and reaches the region where the molten glass GM is retained, GAs stagnation occurs, and GAs pool GA is generated.
The present invention has been made in view of the above circumstances, and has as its technical object to prevent the occurrence of gas accumulation in the interior of a clarification tank.
Means for solving the problems
In order to solve the above problems, the present invention provides a method for manufacturing a glass article, comprising: heating and melting glass raw materials in a melting tank to generate molten glass; transferring the molten glass flowing out of the outlet of the melting tank to a transfer pipe; and a method for producing a glass article, wherein the molten glass transferred from the transfer pipe is subjected to a fining process in a state in which the molten glass is filled in a tubular portion of a fining tank, the transfer pipe including: an upstream-side end portion connected to the melting tank; and a downstream-side end portion connected to the tubular portion, the take-off pipe being 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.
According to this configuration, the top of the inner surface of the carrying pipe is aligned with the top of the inner surface of the tubular portion of the clarification tank, so that the molten glass flowing from the carrying pipe into the clarification tank can flow along the top of the inner surface of the carrying pipe and the top of the inner surface of the tubular portion without being retained. Therefore, the gas generated from the molten glass can move in the fining vessel along with the flow of the molten glass after floating. This prevents gas accumulation.
The transport pipe may be connected to the melting tank such that a top of an inner surface of the upstream side end portion coincides with a top of an inner surface of the outflow port, and a bottom of the inner surface of the upstream side end portion coincides with a bottom of the inner surface of the outflow port. Thereby, the molten glass can be made to flow from the melting tank to the transfer pipe without being retained.
The transport pipe may be connected to the tubular portion such that a bottom of an inner surface of the downstream-side end portion coincides with a bottom of an inner surface of the tubular portion. Here, when the inner diameter of the tubular portion of the clarification tank is larger than the inner diameter of the transport pipe, the molten glass is likely to accumulate around the bottom of the inner surface of the tubular portion because the bottom of the inner surface of the tubular portion does not match the bottom of the inner surface of the downstream end portion. For example, if the bottom of the inner surface of the tubular portion is made to coincide with the bottom of the inner surface of the downstream end portion by making the inner diameter of the transfer pipe and the inner diameter of the tubular portion substantially equal to each other, the molten glass can be prevented from remaining around the bottom of the inner surface of the tubular portion.
The transport pipe can be provided with: and a diameter-enlarged portion having an inner diameter gradually increasing toward the downstream end. The transfer pipe can thereby match the bottom of the inner surface of the downstream end portion with the bottom of the inner surface of the tubular portion, and prevent molten glass from accumulating around the bottom of the inner surface of the tubular portion, even when the inner diameter of the tubular portion of the clarification tank is larger than the inner diameter of the transfer pipe. In addition, in the conventional apparatus in which the diameter of the outlet port and the inner diameter of the tubular portion of the clarification tank are different from each other, the occurrence of gas accumulation in the interior of the clarification tank can be prevented only by changing the transport pipe.
The transport pipe may be formed in a straight tubular shape, and the transport pipe may be connected to the tubular 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 tubular portion. Here, the outer surface of the transport pipe is supported by the refractory, but if the transport pipe is provided with the enlarged diameter portion as described above, the transport pipe and the refractory have different thermal expansion amounts, and therefore a gap is likely to be formed between the refractory and the transport pipe. Therefore, the time period (life) during which the transport pipe can be used may be shortened due to deformation or breakage of the transport pipe. When the transport pipe having a straight tubular shape is used, the outer surface of the transport pipe can be easily supported, and a period during which the transport pipe can be used can be maintained. In addition, the increase in the production cost of the transport pipe can be suppressed. Further, in the conventional apparatus in which the diameter of the outlet port and the inner diameter of the tubular portion of the clarification tank are different from each other, the occurrence of gas accumulation in the interior of the clarification tank can be prevented only by changing the transport pipe.
The method can comprise the following steps: heating is performed in a state where the transport pipe and the tubular portion are separated from each other. By heating the transport pipe and the tubular portion of the clarification tank in a state of being separated from each other, the transport pipe and the tubular portion of the clarification tank can be expanded in advance. By connecting the transport pipe and the tubular portion of the clarification tank after expansion, expansion of the tubular portion of the clarification tank and the transport pipe during clarification treatment 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 clarification tank 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 the melting tank, the clarifying tank, and the transport pipe.
FIG. 3 is a view showing an upstream end of the clarifying tank and a downstream end of the transport pipe.
Fig. 4 is a flowchart relating to a method of manufacturing a glass article.
FIG. 5 is a sectional view showing a transport pipe and a clarifier in the preheating step.
FIG. 6 is a sectional view of a melting tank, a clarifying tank, and a transport pipe according to a second embodiment.
FIG. 7 is a sectional view of a clarifier and a transport pipe according to a third embodiment.
Fig. 8 is a cross-sectional view illustrating the principle of generation of the gas accumulation.
Detailed Description
The following describes aspects for carrying out the present invention 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 glass articles 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 molded body 5, and glass supply paths 6a to 6d connecting these components 1 to 5. The manufacturing apparatus includes a slow cooling furnace (not shown) for slowly cooling the sheet glass GR (glass article) molded by the molding body 5, and a cutting device (not shown) for cutting the sheet glass GR after the slow cooling.
The melting tank 1 is a vessel for performing a melting step of heating and melting an input glass raw material to obtain molten glass GM. The melting tank 1 is connected to the clarifying tank 2 through a glass supply passage 6 a. As shown in fig. 2, the melting tank 1 has an outflow port 1a for supplying molten glass GM to the glass supply passage 6 a. The outlet 1a is a circular hole penetrating the wall 1 b.
The fining vessel 2 performs a fining process (fining treatment) in which molten glass GM is transferred and defoamed by the action of a fining agent or the like. The clarifier 2 is connected to the homogenizer 3 via a glass supply line 6 b. The clarifying tank 2 is formed in a tubular shape of a platinum material (platinum or a platinum alloy). As shown in fig. 2, the clarification tank 2 includes a tubular portion 7 and flange portions 8a and 8b provided at both ends of the tubular portion 7.
In fig. 2, the direction in which the molten glass GM flows is indicated by reference numeral F. In the following description of the positions of the respective components, 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 structure. The inner diameter of the tubular portion 7 is preferably set to 100mm to 300 mm. The wall thickness of the tubular portion 7 is desirably 0.3mm to 3 mm. The length of the tubular portion 7 is preferably 300mm to 10000 mm. These dimensions are not limited to the above ranges, and are appropriately set according to the type of the molten glass GM, the temperature, the scale of the production apparatus, and the like.
The clarifying tank 2 includes a discharge port 7a for discharging gas generated in the molten glass GM at the top of the tubular portion 7. The clarification tank 2 may also be provided with a partition plate (baffle plate) for changing the direction in which the molten glass GM flows, inside the tubular portion 7.
As shown in fig. 1 and 2, the liquid level GS of the molten glass GM in the melting tank 1 is set at a position above the top portion (apex) 7b of the inner surface of the tubular portion 7 or at the same position as the top portion 7 b. The height difference H is set to be 0mm to 200mm, but is not limited to this range. With this setting, the entire internal space of the tubular portion 7 is filled with the molten glass GM flowing 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 inside the tubular portion 7, and the molten glass GM is in contact with all of the inner surfaces (see fig. 2). As described above, by contacting the molten glass GM on all the inner surfaces of the tubular portions 7, the oxidation of the inner surfaces of the tubular portions 7 can be prevented without forming a gas phase space in the tubular portions 7. The positions of all the conveying pipes constituting the glass supply paths 6a to 6d are set to be lower than the liquid level GS of the molten glass GM.
The flange portions 8a and 8b of the clarification tank 2 are circular, but are not limited to this shape. A plate-like projection for supporting the electrode may be formed on the upper portions of the flanges 8a and 8 b. The flanges 8a and 8b are connected to a power supply device (not shown). The clarifying tank 2 heats the molten glass GM flowing inside the tubular portion 7 by resistance heating (joule heat) generated by passing a current through the tubular portion 7 via the flange portions 8a and 8 b.
The flanges 8a and 8b of the clarification tank 2 include: a first flange portion 8a provided at the upstream end portion 2a of the tubular portion 7; and a second flange portion 8b provided at the downstream end portion 2b of the clarification tank 2 (tubular portion 7). The first flange 8a has a first opening 9a through which the molten glass GM flows into the tubular portion 7. The second flange 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 opening portions) 9aU of the first opening portion 9a coincides with the apex 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 portion 9bU of the second opening portion 9b coincides with the apex portion 7b in the inner face of the tubular portion 7.
The glass supply line 6a connecting the melting tank 1 and the clarifying tank 2 includes a transport pipe made of a platinum material (platinum or a platinum alloy). The transport pipe 10 has: a tubular portion 11; and flanges 12a, 12b provided at both ends 10a, 10b of the transport pipe 10. Each of the flange portions 12a, 12b includes: a first flange portion 12a formed at an upstream end portion 10a of the transport pipe 10; and a second flange portion 12b formed at the downstream end portion 10 b.
The inner diameter of the tubular part 11 of the transport pipe 10 is preferably set to 100mm to 300 mm. The wall thickness of the tubular portion 11 is desirably 0.3mm to 3 mm. These dimensions are not limited to the above ranges, and are appropriately set according to the type of the molten glass GM, the temperature, the scale of the production 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 clarification tank 2. The tubular portion 11 is inclined upward from the melting tank 1 toward the clarifying tank 2. The inclination angle of the tubular portion 11 with respect to the horizontal direction is set to, for example, 3 ° to 30 °.
The first flange 12a of the transfer pipe 10 is in contact with the wall 1b of the melting tank 1, and the second flange 12b is in contact with and opposed to the first flange 8a of the clarification tank 2. Each of the flanges 12a and 12b has an opening 13a and 13 b. The openings 13a and 13b are formed in an elliptical shape that is vertically long. 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 outlet 1 a. The length DL of the major axis of the opening 13a of the first flange 12a is substantially equal to the diameter of the outlet 1 a. Here, "substantially equal" means that the length DL of the major axis is 90% to 110% of the diameter of the outlet 1 a.
As shown in fig. 2, the top 11a of the inner surface of the upstream end 10a of the transport pipe 10 coincides with the top of the inner surface of the outflow port 1a of the melting tank 1. That is, the upper end 13aU of the opening 13a of the transport pipe 10 coincides with the upper end 1aU of the spout 1 a. The bottom 11b of the inner surface of the upstream end 10a of the transport pipe 10 coincides with the bottom of the outlet 1 a. That is, the lower end 13aD of the opening 13a of the transport pipe 10 coincides with the lower end 1aD of the outflow port 1 a.
The opening 13b of the second flange portion 12b overlaps the first opening 9a of the first flange portion 8a of the clarification tank 2. The opening area of the opening 13b is set smaller than the opening area of the first opening 9a of the clarification tank 2. The length DL of the major axis of the opening 13b is substantially equal to the diameter of the first opening 9a of the clarification tank 2. That is, the length DL of the major axis is 90% to 110% of the diameter of the first opening 9 a.
The top 11a of the inner surface of the downstream end 10b of the transport pipe 10 coincides with the top 7b of the inner surface of the clarification tank 2. That is, the upper end portion 13bU of the opening 13b in the downstream end portion 10b of the transport pipe 10 coincides with the upper end portion 9aU of the first opening 9a of the clarification tank 2. The lower end 13bD of the opening 13b of the transport pipe 10 coincides with the lower end 9aD of the first opening 9a of the clarification tank 2.
The glass supply line 6b connecting the clarifier tank 2 and the homogenizer tank 3 includes a transport pipe made of a platinum material (platinum or a platinum alloy). The transport pipe 14 is formed in a straight pipe shape and is connected to the downstream end 2b of the clarification tank 2. As shown in fig. 2, the transport pipe 14 includes: a tubular portion 15; and flange portions 16a, 16b and openings 17a, 17b provided at both end portions 14a, 14b of the transport pipe 14.
The inner diameter of the tubular portion 15 of the transport pipe 14 is preferably set to 100mm to 300 mm. The wall thickness of the tubular portion 15 is desirably 0.3mm to 3 mm. These dimensions are not limited to the above ranges, and are suitable depending on the type of the molten glass GM, the temperature, the scale of the production 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 clarification tank 2.
Each of the flanges 16a and 16b is formed in a disc shape. The openings 17a and 17b are circular. 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 8b of the clarification tank 2. According to this configuration, the entire circumference of the opening 17a at the upstream end 14a of the transport pipe 14 is arranged to coincide with the entire circumference of the second opening 9b of the clarification tank 2.
The flange portions 12a, 12b, 16a, 16b of the transport pipes 10, 14 are connected to a power supply device (not shown). In the glass supply paths 6a and 6b, similarly to the clarification tank 2, the molten glass GM flowing through the inside of the transport pipes 10 and 14 is heated by resistance heating (joule heat) generated by passing an electric current through the flange portions 12a, 12b, 16a, and 16b through the tubular portions 11 and 15 (the same applies to the other glass supply paths 6c and 6 d).
The homogenizing tank 3 is a platinum container for performing a step (homogenizing step) of stirring and homogenizing the molten glass GM subjected to the refining treatment. The homogenization tank 3 is provided with a stirrer 3a having stirring blades. The homogenization tank 3 is connected to the crucible 4 through a glass supply passage 6 c. The glass supply line 6c includes a transport pipe made of a platinum material (platinum or a platinum alloy) in the same manner as the glass supply lines 6a and 6 b.
The crucible 4 is a container for performing a state adjustment step of adjusting the molten glass GM to a state suitable for molding. The crucible 4 is exemplified as a volume portion for adjusting the viscosity and flow rate of the molten glass GM. The crucible 4 is connected to the forming body 5 through a glass supply passage 6 d. The glass supply line 6d includes a transport pipe made of a platinum material (platinum or a platinum alloy) as in the glass supply lines 6a to 6 c.
The forming body 5 forms the molten glass GM into a desired shape. In the present embodiment, the molded body 5 is formed by the overflow downdraw method to mold the molten glass GM into a plate shape. Specifically, the forming body 5 has a substantially wedge-shaped cross-sectional shape (cross-sectional shape perpendicular to the paper surface of fig. 1), and an overflow groove (not shown) is formed in an upper portion of the forming body 5.
The forming body 5 causes the molten glass GM to overflow from the overflow vessel and flow down along the side wall surfaces on both sides of the forming body 5 (side surfaces on the front and back sides of the paper surface). The forming body 5 fuses the molten glass GM flowing down at the lower top of the sidewall surface. Thereby, a band-shaped sheet glass GR is formed. The molded body 5 may be a molded body that performs another down-draw method such as a slit down-draw method. Instead of the molded body 5, a molding device using a float method may be provided.
The thus obtained sheet glass GR has a thickness of, for example, 0.01 to 10mm, and is used for flat panel displays such as liquid crystal displays and organic EL displays, substrates such as organic EL illuminators and solar cells, and protective covers. The glass article according to the present invention is not limited to the sheet glass GR, and includes glass tubes and other articles having various shapes. For example, in the case of forming a glass tube, a forming apparatus using the danner method is provided instead of the forming body 5.
As the material of the plate glass GR, silicate glass or silica glass is used, borosilicate glass, soda lime glass, alumina silicate glass, or chemically strengthened glass is preferably used, and alkali-free glass is most preferably used. Here, the alkali-free glass means glass substantially free of alkali components (alkali metal oxides), specifically glass having an alkali component weight ratio 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.
A method for manufacturing a glass article (sheet glass GR) using the manufacturing apparatus having the above-described configuration 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 temperature of each of the components 1 to 5 and 6a to 6d of the manufacturing apparatus is raised in a state where they are separated individually. Fig. 5 shows, as an example, a state in which the transport pipe 10 and the clarification tank 2 are separated from each other. In the preheating step S1, the outlet 1a of the melting tank 1 is closed by a closing member. In the preheating step S1, the respective components 1 to 5 and 6a to 6d are heated to a predetermined temperature. By this heating, the platinum material portion of the constituent elements 1 to 5 and 6a to 6d expands. For example, the tubular portion 7 of the clarification tank 2 and the tubular portion 11 of the transport pipe 10 expand in the longitudinal direction thereof as shown by the two-dot chain line in fig. 5.
In the assembling step S2, the separated components 1 to 5 and 6a to 6d are connected to each other to assemble the manufacturing apparatus. For example, the upstream end 10a of the transport pipe 10 is connected to the outlet 1a of the melting tank 1. Specifically, the first flange portion 12a of the transport pipe 10 is brought into contact with the wall portion 1b of the melting tank 1, and the opening 13a is overlapped with the outlet port 1 a.
Then, the downstream end 10b of the transport pipe 10 is connected to the upstream end 2a of the clarification tank 2. That is, the second flange portion 12b of the transport pipe 10 and the first flange portion 8a of the clarification 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 clarification tank 2 coincides with the upper end portion 13bU of the opening 13b of the transport pipe 10.
Then, the transfer pipe 14 is connected to the clarifying tank 2. That is, the flange portion 16a of the transport pipe 14 and the second flange portion 8b of the clarification 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 of the transport pipe 14 coincides with the second opening 9b of the clarification tank 2.
Further, the homogenizing tank 3, the crucible 4, the molded body 5, and the glass supply paths 6c and 6d are connected to assemble the manufacturing apparatus.
In the melting step S3, the glass raw material supplied into the melting tank 1 is heated to produce 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 assembling step S2.
In the molten glass supply step S4, the molten glass GM in the melting tank 1 is transferred to the clarifying tank 2, the homogenizing tank 3, the crucible 4, and then the molded body 5 in order through the glass supply paths 6a to 6 d. In the molten glass supply step S4, when the molten glass GM flows through the tubular portion 7 of the fining vessel 2, gas (bubbles) is generated from the molten glass GM by the action of the fining agent mixed with the glass raw material. The gas is discharged to the outside through the discharge port 7a of the clarifier 2 (clarification step). In the homogenizing tank 3, the molten glass GM is stirred and homogenized (homogenizing step). The state (e.g., viscosity and flow rate) of the molten glass GM is adjusted when the molten glass GM passes through the crucible 4 and the glass supply passage 6d (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 from the overflow trough along the side wall surface thereof in this order. The forming body 5 forms a ribbon-shaped sheet glass GR by fusing the molten glass GM flowing down at the lower tip.
Thereafter, the strip-shaped sheet glass GR is cooled in a slow cooling process S6 by a slow cooling furnace, and is cut in a cutting process S7 by a cutting device. Thus, a sheet glass (glass article) of a predetermined size is cut out from the strip-shaped sheet glass GR. Alternatively, after both ends in the width direction of the sheet glass GR are removed in the cutting step S7, the sheet glass GR in a band shape may be wound into a roll to obtain a glass roll as a glass article (winding step).
According to the method for producing a glass article of the present embodiment described above, in a state where the conveying pipe 10 and the clarification tank 2 are connected, the top portion 11a of the inner surface of the downstream end portion 10b of the conveying pipe 10 (the upper end portion 13bU of the opening 13 b) and the top portion 7b of the inner surface of the upstream end portion 2a of the clarification tank 2 (the upper end portion 9aU of the first opening 9 a) are aligned, and thus the molten glass GM flowing from the conveying pipe 10 into the clarification tank 2 can flow along the top portion 11a of the conveying pipe 10 and the top portion 7b of the clarification tank 2 without being retained. Therefore, the gas generated from the molten glass GM moves in the clarifying tank 2 without causing gas accumulation accompanying the flow of the molten glass GM, and is reliably discharged from the discharge port 7 a. Even if gas is generated from the molten glass GM around the bottom 7c of the clarification tank 2, the gas floats up and moves in the clarification tank 2 along with the flow of the molten glass GM, and is reliably discharged from the discharge port 7 a.
Here, in the manufacturing apparatus according to the first embodiment, the molten glass GM tends to stay around the bottom portion 7c of the fining vessel 2, and particularly around the bottom portion 7c at the upstream end portion 2a of the fining vessel 2. In this case, the retained molten glass GM may be modified. From the viewpoint of preventing this, it is preferable to adopt the second embodiment or the third embodiment described later.
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 transport pipe 10 includes a first tubular portion 11A having a straight tubular shape and a second tubular portion 11B having a tapered shape. The first tubular portion 11A is formed on the upstream end 10a side of the transport pipe 10 and connected to the melting tank 1. The second tubular portion 11B is formed on the downstream end 10B side of the transport pipe 10 and connected to the clarification tank 2.
The second tubular portion 11B includes a diameter-enlarged portion whose inner diameter gradually increases from the middle portion of the transport pipe 10 toward the downstream end portion 10B. According to this configuration, the opening 13b of the downstream end 10b of the transport pipe 10 is formed in a circular shape.
The inner diameter of the second tubular portion 11B at the downstream end 10B of the transport pipe 10 is substantially equal to the inner diameter of the tubular portion 7 of the clarification tank 2. That is, the diameter of the opening 13b at the downstream end 10b of the transport pipe 10 is set to 90% to 110% of the inner diameter of the tubular portion 7 of the clarification tank 2. The diameter of the first opening 9a formed in the first flange 8a of the clarification tank 2 is substantially equal to the inner diameter of the tubular portion 7. According to this configuration, the bottom portion 13bD of the opening 13B of the second tubular portion 11B of the transport pipe 10 coincides with the bottom portion 9aD of the first opening 9a of the upstream end 2a of the clarification tank 2. Thus, the molten glass GM flowing from the transfer pipe 10 into the clarifier 2 flows not only along the top portion 11a of the transfer pipe 10 and the top portion 7b of the clarifier 2 but also along the bottom portion 11b of the transfer pipe 10 and the bottom portion 7c of the clarifier 2 without stagnating.
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 pipe 10 is configured as an expanded diameter portion, but the second tubular portion 11B of the transfer pipe 10 according to the present embodiment is configured as a straight pipe shape having a fixed inner diameter.
The opening 13B of the downstream end 10B of the transport pipe 10 (second tubular portion 11B) is formed in an elliptical shape elongated in the vertical 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 clarification tank 2. Therefore, in the present embodiment, the bottom portion 13bD of the opening 13B of the second tubular portion 11B of the transport pipe 10 coincides with the bottom portion 9aD of the first opening 9a of the upstream end portion 2a of the clarification tank 2. Therefore, the molten glass GM flowing from the transfer pipe 10 into the clarifier 2 flows not only along the top portion 11a of the transfer pipe 10 and the top portion 7b of the clarifier 2 but also along the bottom portion 11b of the transfer pipe 10 and the bottom portion 7c of the clarifier 2 without stagnating.
The present invention is not limited to the configurations of the above embodiments, and is not limited to the above-described operational effects. The present invention can be modified in various ways without departing from the scope of the present invention.
In the second embodiment described above, the example in which the enlarged diameter portion (the second tubular portion 11B) is provided in the range from the middle portion of the transport pipe 10 to the downstream end portion 10B has been described, but the present invention is not limited to this configuration. For example, the tubular portion 11 may be formed as an enlarged diameter portion extending from the upstream end 10a to the downstream end 10b of the transport pipe 10.
Description of reference numerals
1 melting tank
1a outflow opening
Upper end (top) of 1aU outflow
2 clarifying tank
7 tubular part
7b top of inner face of tubular part
10 transport pipe
10a upstream end part
10b downstream end
11a top of the inner surface of the transport pipe
11B second tubular portion (expanding portion)
GM molten glass
GR plate glass (glass articles)
S1 preheating step
S3 melting procedure
S4 molten glass supply step
Claims (6)
1. A method for manufacturing a glass article, comprising the steps of:
heating and melting glass raw materials in a melting tank to generate molten glass;
transferring the molten glass flowing out of the outlet of the melting tank to a transfer pipe; and
refining the molten glass transferred from the transfer pipe in a state where the molten glass is filled in a tubular portion of a refining tank,
the method for manufacturing a glass article is characterized in that,
the transport pipe is provided with: an upstream-side end portion connected to the melting tank; and a downstream-side end portion connected to the tubular portion,
the take-off 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.
2. The method for manufacturing a glass article according to claim 1,
the transport 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 manufacturing a glass article according to claim 1 or 2,
the transport pipe is connected to the tubular portion such that a bottom of an inner face in the downstream-side end portion coincides with a bottom of an inner face of the tubular portion.
4. The method for manufacturing a glass article according to claim 3,
the transport pipe is provided with: and a diameter-enlarged portion having an inner diameter gradually increasing toward the downstream end.
5. The method for manufacturing a glass article according to claim 1 or 2,
the conveying pipe is formed into a straight pipe shape,
the transport pipe is connected to the tubular portion such that a bottom of an inner face in the downstream-side end portion is higher than a bottom of an inner face of the tubular portion.
6. The method for producing a glass article according to any one of claims 1 to 5,
the method for manufacturing a glass article comprises the following steps:
heating is performed in a state where the transport pipe and the tubular portion are separated from each other.
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 |
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| CN112912348A true CN112912348A (en) | 2021-06-04 |
| CN112912348B 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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| JP5976863B2 (en) | 2014-03-31 | 2016-08-24 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass substrate manufacturing method and glass substrate manufacturing apparatus |
| JP6133958B2 (en) * | 2014-10-31 | 2017-05-24 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass substrate manufacturing method and glass substrate manufacturing apparatus |
| JP6752036B2 (en) | 2016-03-31 | 2020-09-09 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass substrate manufacturing method and glass substrate manufacturing equipment |
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2018
- 2018-12-21 JP JP2018239407A patent/JP7092021B2/en active Active
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2019
- 2019-11-20 KR KR1020217014817A patent/KR102655115B1/en active IP Right Grant
- 2019-11-20 CN CN201980070843.XA patent/CN112912348B/en active Active
- 2019-11-20 WO PCT/JP2019/045474 patent/WO2020129528A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020129528A1 (en) | 2020-06-25 |
| CN112912348B (en) | 2023-11-14 |
| KR102655115B1 (en) | 2024-04-08 |
| KR20210101209A (en) | 2021-08-18 |
| TW202108516A (en) | 2021-03-01 |
| JP7092021B2 (en) | 2022-06-28 |
| JP2020100531A (en) | 2020-07-02 |
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