CN112867697B - Method for manufacturing glass article - Google Patents
Method for manufacturing glass article Download PDFInfo
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- CN112867697B CN112867697B CN201980069167.4A CN201980069167A CN112867697B CN 112867697 B CN112867697 B CN 112867697B CN 201980069167 A CN201980069167 A CN 201980069167A CN 112867697 B CN112867697 B CN 112867697B
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- glass ribbon
- joint
- refractory brick
- forming
- glass
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The invention aims to provide a high-quality glass article by preventing the formation of a rib-like convex defect on the surface of a glass ribbon. The present invention provides a method for manufacturing a glass article, comprising: a molding step of forming a glass ribbon (G) by flowing down molten glass (Gm) from a forming body (5) in a forming furnace (1); and a heat treatment step of conveying the glass ribbon (G) formed in the forming step in a conveying direction and performing heat treatment on the glass ribbon (G). The molding step is provided with: and a step of cooling the glass ribbon (G) using the lower refractory bricks (7) of the forming furnace (1), wherein the lower refractory bricks (7) of the forming furnace (1) face the surface of the glass ribbon (G) flowing down from the forming body (5) in the thickness direction of the glass ribbon (G). The lower refractory bricks (7) are divided into a plurality of sections in the width direction of the glass ribbon (G), and the position of the joint (9) between adjacent lower refractory bricks (7) in the width direction changes in the thickness direction when viewed from the upstream side in the conveying direction.
Description
Technical Field
The present invention relates to a method for producing a glass article.
Background
Examples of the method for producing a glass article include downdraw methods such as overflow downdraw, slot downdraw, and redraw.
The method for producing a glass article using such a downdraw method comprises: a forming step of forming a glass ribbon by flowing down molten glass from a forming body in a forming furnace; and a heat treatment step of conveying the formed glass ribbon downward in a heat treatment furnace disposed below the forming furnace, and performing a heat treatment (annealing treatment) for reducing warpage and deformation on the glass ribbon (for example, refer to patent document 1). After the heat treatment step, the glass ribbon cooled to around room temperature is cut into a predetermined length to produce a glass sheet, or wound into a roll to produce a glass roll.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2014-122124
Disclosure of Invention
Problems to be solved by the invention
In the forming step, a step of cooling the surface of the glass ribbon flowing down from the forming body may be performed separately from the heat treatment step. In this cooling step, heat of the glass ribbon is released to the outside of the furnace by using the lower refractory bricks of the forming furnace, which face the surface of the glass ribbon in the thickness direction of the glass ribbon, to thereby cool the glass ribbon.
However, in view of ease of exchange, the lower refractory bricks may be divided into a plurality of sections in the width direction of the glass ribbon. However, in this structure, a rib-like convex defect extending in the conveyance direction may be formed on the surface of the glass ribbon at a position facing the joint between adjacent lower refractory bricks. If such a rib-like convex defect is formed, there is a problem that smoothness of the surface of the manufactured glass article is lost, and a high-quality glass article cannot be manufactured.
Here, the streak-like convex defect is considered to be generated for the following reason. That is, the gas easily flows through the joints of the lower refractory bricks to the inside and outside of the forming furnace. As a result, the heat release of the glass ribbon increases at the position facing the joint of the lower refractory brick, and only a predetermined portion of the glass ribbon is easily cooled locally. Further, it is considered that when such local cooling occurs, the surface of the glass ribbon locally contracts and bulges, and the glass ribbon becomes a rib-like convex defect.
The invention aims to provide a high-quality glass article by preventing the formation of a rib-like convex defect on the surface of a glass ribbon.
Means for solving the problems
The present invention, which has been made to solve the above-described problems, provides a method for manufacturing a glass plate, comprising: a forming step of forming a glass ribbon by flowing down molten glass from a forming body in a forming furnace; and a heat treatment step of conveying the glass ribbon formed in the forming step along a conveying direction and performing heat treatment on the glass ribbon, wherein the forming step includes: and cooling the glass ribbon by using a lower refractory brick of a forming furnace, wherein the lower refractory brick of the forming furnace faces the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon, the lower refractory brick is divided into a plurality of sections in the width direction of the glass ribbon, and when viewed from the upstream side in the conveying direction, the position of a joint between adjacent lower refractory bricks in the width direction changes in the thickness direction of the glass ribbon. This can prevent the gas inside and outside the forming furnace from flowing through the joints of the lower refractory bricks, and improve the sealing property of the joints of the lower refractory bricks. Therefore, it is possible to prevent the formation of a rib-like convex defect on the surface of the glass ribbon by suppressing the local cooling of only a predetermined portion of the glass ribbon at a position facing the joint of the lower refractory brick.
In the above configuration, it is preferable that: when viewed from the upstream side in the conveying direction, the joint between adjacent lower refractory bricks has a bent portion. This allows the joint of the lower refractory brick to be folded by the folded portion, thereby further improving the sealability. Therefore, it is possible to more reliably suppress the situation in which only the predetermined member of the glass ribbon is locally cooled at the position facing the joint.
In the above configuration, it is preferable that: the position of the joint between adjacent lower refractory bricks in the width direction changes in the conveyance direction when viewed from the glass ribbon side. Thus, the position where the glass ribbon faces the joint of the lower refractory brick changes, and therefore, it is possible to more reliably suppress localized cooling of only a predetermined portion of the glass ribbon.
In the above constitution, it is preferable that: the joint between adjacent lower refractory bricks extends in a direction inclined with respect to the conveyance direction when viewed from the glass ribbon side. Thus, the position where the glass ribbon faces the joint of the lower refractory brick continuously changes, and thus, it is possible to more reliably suppress the situation where only a predetermined portion of the glass ribbon is locally cooled.
In the above configuration, the forming furnace may include an upper refractory brick facing the forming body, and a connecting refractory brick connecting a lower end portion of the upper refractory brick and an upper end portion of the lower refractory brick so that the lower refractory brick is closer to the glass ribbon side than the upper refractory brick. This allows the lower refractory bricks to be brought close to the glass ribbon, and the space between the lower refractory bricks and the glass ribbon to be reduced, so that the glass ribbon flowing down from the forming body can be efficiently cooled using the lower refractory bricks.
In the above constitution, it is preferable that: the connecting refractory bricks are divided into a plurality of segments in the width direction, and the positions of the joints between adjacent connecting refractory bricks in the width direction change in the thickness direction of the glass ribbon when viewed from the upstream side in the conveying direction. This improves the sealing properties of the joint of the connecting refractory bricks. Therefore, the gas inside and outside the forming furnace is not easily circulated directly through the joint of the refractory bricks for joining. Therefore, it is possible to prevent the formation of a rib-like convex defect by suppressing the local cooling of only the predetermined member of the glass ribbon at the position facing the joint of the connecting refractory bricks.
In the above constitution, it is preferable that: when viewed from the upstream side in the conveying direction, the joint between adjacent connecting refractory bricks has a bent portion. This allows the joint of the connecting refractory brick to be folded by the folded portion, thereby further improving the sealing property. Therefore, it is possible to more reliably suppress the situation in which only the predetermined member of the glass ribbon is locally cooled at the position facing the joint.
In the above constitution, it is preferable that: when viewed from the glass ribbon side, the position of the joint between adjacent connecting refractory bricks in the width direction changes in the conveyance direction. Thus, the position where the glass ribbon faces the joint of the connecting refractory bricks changes, and thus, it is possible to more reliably suppress localized cooling of only a predetermined portion of the glass ribbon.
In the above constitution, it is preferable that: when viewed from the glass ribbon side, the joint between adjacent connecting refractory bricks extends in a direction inclined with respect to the conveyance direction. Thus, the position where the glass ribbon faces the joint of the connecting refractory bricks continuously changes, and thus, it is possible to more reliably suppress the situation where only a predetermined portion of the glass ribbon is locally cooled.
The present invention, which has been made to solve the above-described problems, provides a method for manufacturing a glass article, comprising: a forming step of forming a glass ribbon by flowing down molten glass from a forming body in a forming furnace; and a heat treatment step of conveying the glass ribbon formed in the forming step along a conveying direction and performing heat treatment on the glass ribbon, wherein the forming step includes: and cooling the glass ribbon by using a lower refractory brick of a forming furnace, wherein the lower refractory brick of the forming furnace faces the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon, the lower refractory brick is divided into a plurality of sections in the width direction of the glass ribbon, and when seen from the glass ribbon side, the position of a joint between adjacent lower refractory bricks in the width direction changes in the conveying direction. This makes it possible to suppress the situation in which only a predetermined portion of the glass ribbon is locally cooled, because the position where the glass ribbon faces the joint of the lower refractory brick changes. Therefore, the formation of a rib-like convex defect on the surface of the glass ribbon can be prevented.
Effects of the invention
According to the present invention, it is possible to provide a high-quality glass article by preventing the formation of a rib-like convex defect on the surface of a glass ribbon.
Drawings
Fig. 1 is a schematic longitudinal sectional view of a glass article manufacturing apparatus.
FIG. 2 is a sectional view A-A of FIG. 1, showing a state of a joint between a lower refractory brick and a connecting refractory brick when viewed from the glass ribbon side.
Fig. 3 is a sectional view of fig. 1B-B, showing a state of a joint of the lower refractory brick when viewed from the upstream side in the conveying direction.
Fig. 4 is a sectional view taken along line C-C of fig. 1, showing a joint of the connecting refractory bricks when viewed from the upstream side in the conveying direction.
Fig. 5 is a cross-sectional view showing a modification of the joint of the lower refractory brick when viewed from the upstream side in the conveying direction.
Fig. 6 is a cross-sectional view showing a modification of the joint of the lower refractory brick when viewed from the upstream side in the conveying direction.
Fig. 7 is a cross-sectional view showing a modification of the joint of the lower refractory brick when viewed from the upstream side in the conveying direction.
Fig. 8 is a cross-sectional view showing a modification of the joint of the lower refractory brick when viewed from the upstream side in the conveying direction.
FIG. 9 is a sectional view A-A of FIG. 1, showing a modification of the joint of the lower refractory brick when viewed from the glass ribbon side.
Detailed Description
An embodiment of the present invention will be described below based on the accompanying drawings. In the figure, XYZ is an orthogonal coordinate system. The X direction and the Y direction are horizontal directions, and the Z direction is vertical direction. While the glass ribbon G is being conveyed in the longitudinal posture, the X direction becomes the thickness direction of the glass ribbon G (hereinafter, also simply referred to as "thickness direction"), the Y direction becomes the width direction of the glass ribbon G (hereinafter, also simply referred to as "width direction"), and the Z direction becomes the conveyance direction of the glass ribbon G (hereinafter, also simply referred to as "conveyance direction").
As shown in fig. 1, the apparatus for manufacturing a glass article for embodying the method for manufacturing a glass article according to the present embodiment is an apparatus for continuously forming a glass ribbon G. Glass articles made from glass ribbon G include glass sheets and glass rolls.
The glass article manufacturing apparatus includes: a forming furnace 1 for forming a glass ribbon G, a heat treatment furnace 2 for performing heat treatment on the glass ribbon G, a cooling zone 3 for cooling the glass ribbon G to a temperature near room temperature, and a pair of rolls 4 provided in each of the heat treatment furnace 2 and the cooling zone 3 in a plurality of stages.
Here, the glass article manufacturing apparatus may further include, on the downstream side of the cooling zone 3: a cutting device for cutting the glass ribbon G to obtain a glass plate, an end face processing device for processing the end face of the glass plate, a cleaning device for cleaning the glass plate, an inspection device for inspecting the glass plate, and the like. Alternatively, the glass article manufacturing apparatus may further include, on the downstream side of the cooling zone 3: a cutting device for cutting and removing both ends of the glass ribbon G in the width direction, a winding device for winding the glass ribbon G into a roll shape to obtain a glass roll, and the like.
A forming body 5 for forming a glass ribbon G from a molten glass Gm by an overflow downdraw method is disposed in the inner space of the forming furnace 1. The molten glass Gm supplied to the forming body 5 overflows from the groove 5a formed at the top of the forming body 5, and the overflowed molten glass Gm merges at the lower end along both side surfaces 5b of the forming body 5 having a wedge-like cross section, whereby the plate-shaped glass ribbon G is continuously formed. The formed glass ribbon G is in a longitudinal position (preferably a vertical position).
The forming furnace 1 includes: an upper refractory brick 6, a lower refractory brick 7, and a connecting refractory brick 8 connecting the lower end of the upper refractory brick 6 and the upper end of the lower refractory brick 7. The connecting refractory bricks 8 connect the upper refractory bricks 6 and the lower refractory bricks 7 such that the lower refractory bricks 7 are closer to the glass ribbon G side than the upper refractory bricks 6. The refractory brick 8 for connection may be omitted.
The temperature of the molten glass Gm flowing down through the surface of the forming body 5 is adjusted at a position corresponding to the upper refractory brick 6. The temperature of the molten glass Gm flowing down through the surface of the forming body 5 can be adjusted by a heating device (not shown) such as a heater provided at a position corresponding to the upper refractory brick 6, for example. The heating means may be provided on the furnace inner side or the furnace outer side of the upper refractory bricks 6. Alternatively, the heating means may be embedded in the upper refractory brick 6.
The lower refractory bricks 7 face the surface of the glass ribbon G flowing down from the forming body 5 in the thickness direction, and the lower refractory bricks 7 are used to cool the glass ribbon G. The purpose of this cooling is to adjust the thickness unevenness of the glass ribbon G, and to release heat of the glass ribbon G to the outside of the furnace through the lower refractory bricks 7. That is, the lower refractory brick 7 corresponds to a heat radiation region. A heating device such as a heater is not provided at a position corresponding to the lower refractory brick 7.
Here, for example, the upper refractory bricks 6 and the lower refractory bricks 7 are formed of silicon carbide (SiC) bricks or the like, and the connecting refractory bricks 8 are formed of aluminum zirconium bricks or the like.
The internal space of the heat treatment furnace 2 has a predetermined temperature gradient downward. The glass ribbon G in the vertical posture is annealed (anneal) so as to be lower in temperature as it moves downward in the internal space of the heat treatment furnace 2. This annealing serves to adjust (reduce) the warp and deformation of the glass ribbon G. The temperature gradient in the internal space of the heat treatment furnace 2 can be adjusted by a heating device (not shown) such as a heater provided at a position corresponding to the heat treatment furnace 2. The heating means may be provided inside or outside the heat treatment furnace 2. Alternatively, the heating device may be buried inside the furnace wall of the heat treatment furnace 2.
The plurality of roller pairs 4 sandwich both ends in the width direction of the glass ribbon G in the longitudinal posture from both sides of the front and back. The roller pair 4 is not provided in a region from the lower end portion of the formed body 5 to the lower end portion of the lower refractory brick 7.
The uppermost roller pair 4a among the plurality of roller pairs 4 is provided near the upper end of the heat treatment furnace 2, and is configured by a cooling roller (edge roller) that cools both ends of the glass ribbon G in the width direction. The cooling roller is used for inhibiting the shrinkage of the glass ribbon G in the width direction.
The plurality of roller pairs 4 may include roller pairs 4 that do not sandwich the widthwise ends of the glass ribbon G in the internal space of the heat treatment furnace 2 or the like. In other words, the opposing distance between the pair of rollers 4 may be set to be larger than the thickness of the widthwise end portion of the glass ribbon G, so that the glass ribbon G passes between the pair of rollers 4.
As shown in fig. 2, the lower refractory bricks 7 and the connecting refractory bricks 8 are divided into a plurality of pieces in the width direction. Accordingly, seams 9, 10 are formed between the bricks 7,8 adjacent in the width direction. The refractory brick 8 for connection may be a seamless integrated structure without being divided into a plurality of pieces in the width direction.
When viewed from the glass ribbon G side, the joint 9 of the lower refractory brick 7 is linear and inclined with respect to the conveyance direction, and the position in the width direction changes in the conveyance direction. Similarly, when viewed from the glass ribbon G side, the joint 10 of the connecting refractory brick 8 is also linear and inclined with respect to the conveyance direction, and the position in the width direction changes in the conveyance direction. Accordingly, the positions of the glass ribbon G in the width direction facing the joints 9, 10 are sequentially changed in the conveyance direction, and therefore, it is possible to suppress the situation in which only the predetermined portion of the glass ribbon G in the width direction is locally continuously cooled. In the example of the figure, the inclination direction of the joint 9 and the inclination direction of the joint 10 are opposite to each other, but may be the same direction. The joint 9 (or the joint 10) may include a joint having a different direction of inclination. In addition, if the positions of the joints 9, 10 in the width direction are changed in the conveyance direction when viewed from the glass ribbon G side, the form of the change in the joints 9, 10 is not limited to a straight line. However, if the bricks 7,8 are linear, there is an advantage that the bricks can be easily processed.
As shown in fig. 3, the joint 9 of the lower refractory brick 7 has a bent portion 9a when viewed from the upstream side in the conveying direction, and the position in the width direction changes in the thickness direction. Similarly, as shown in fig. 4, the joint 10 of the connecting refractory brick 8 also has a bent portion 10a when viewed from the upstream side in the conveying direction, and the position in the width direction changes in the thickness direction. This improves the sealability of the joints 9, 10, and therefore, the gas inside and outside the forming furnace 1 is less likely to flow directly through the joints 9, 10. Therefore, the predetermined portion of the glass ribbon G in the width direction can be prevented from being locally cooled at the position where the glass ribbon G faces the joints 9, 10.
In the present embodiment, the joint 9 of the lower refractory brick 7 has two bent portions 9a. By these bent portions 9a, the joint 9 has two first portions 9b extending in the thickness direction and a second portion 9c extending in the width direction between these first portions 9b, and is formed in a stepped shape (hook shape) as a whole. Similarly, the joint 10 of the connecting refractory brick 8 also has two bent portions 10a. The joint 10 has two first portions 10b extending in the thickness direction and a second portion 10c extending in the width direction between the first portions 10b by the bent portions 10a, and is formed in a stepped shape (hook shape) as a whole. That is, the joints 9, 10 have a relatively simple shape, but the second portions 9c,10c extending in the width direction have a relatively high resistance to the gas passing through the joints 9, 10, and therefore, have a structure in which the gas is not easily circulated.
Here, in the present embodiment, the position P1 (or the position P2) of the joint 9 of the lower refractory brick 7 shown in fig. 3 facing the furnace and the position Q1 (or the position Q2) of the joint 10 of the connecting refractory brick 8 shown in fig. 4 facing the furnace are not overlapped in the width direction when viewed from the upstream side in the transport direction. That is, the position P1 (or the position P2) of the joint 9 of the lower refractory brick 7 is located at the portion of the joint 10 of the connecting refractory brick 8, and the position Q1 (or the position Q2) of the joint 10 of the connecting refractory brick 8 is located at the portion of the joint 9 of the lower refractory brick 7. Thereby, the influence of the joints 9, 10 is dispersed in the width direction of the glass ribbon G. Fig. 2 illustrates the following modes: when viewed from the glass ribbon G side, the formation region of the joint 9 of the lower refractory brick 7 extending over the entire length in the conveyance direction and the formation region of the joint 10 of the connecting refractory brick 8 extending over the entire length in the conveyance direction do not overlap in the width direction.
In the present embodiment, when viewed from the upstream side in the conveyance direction, the position P1 facing the furnace of the joint 9 of the lower refractory brick 7 on the side facing the one surface of the glass ribbon G and the position P2 facing the furnace of the joint 9 of the lower refractory brick 7 on the other side facing the other surface of the glass ribbon G are not overlapped with each other but are different from each other in the width direction. That is, the joint 9 of the lower refractory brick 7 on one side is located at a position facing the furnace interior, and the joint 9 of the lower refractory brick 7 on the other side is located at a position facing the furnace interior in the thickness direction. Similarly, when viewed from the upstream side in the conveyance direction, the position Q1 facing the furnace of the joint 10 of the connecting refractory brick 8 on the side facing the one surface of the glass ribbon G and the position Q2 facing the furnace of the joint 10 of the connecting refractory brick 8 on the other side facing the other surface of the glass ribbon G are not overlapped and differ in the width direction. That is, the joint 10 of one connecting refractory brick 8 faces the portion of the other connecting refractory brick 8 facing the furnace interior in the thickness direction, which is free of the joint 10. The effect of the joints 9, 10 is thereby dispersed over both surfaces of the glass ribbon G. Fig. 3 and 4 each illustrate the following modes: when viewed from the upstream side in the transport direction, the formation regions of the joints 9 of the lower refractory bricks 7 on the opposite sides over the entire length in the thickness direction are not overlapped with each other in the width direction; and a configuration in which the formation regions of the joint 10 of the connecting refractory bricks 8 on the opposite sides over the entire length in the thickness direction are not overlapped with each other in the width direction when viewed from the upstream side in the conveying direction.
In the present embodiment, the bent portion 10a (or the second portion 10 c) of the joint 10 in the connecting refractory brick 8 is located outside the upper refractory brick 6, that is, outside the furnace. Thus, only the portion of the seam 10 facing the furnace interior is constituted by the linear first portion 10b in the thickness direction, and the shape of the seam 10 facing the furnace interior is made uniform. The bent portion 10a (or the second portion 10 c) of the joint 10 in the connecting refractory brick 8 may be located below the upper refractory brick 6 or may be located inside the furnace further inside than the upper refractory brick 6.
Next, a method for manufacturing a glass article using the manufacturing apparatus configured as described above will be described.
As shown in fig. 1, the method for manufacturing a glass article includes: a molding step of molding the molten glass Gm flowing down from the molding body 5 in the molding furnace 1 into a glass ribbon G; a heat treatment step of conveying the glass ribbon G formed in the heat treatment furnace 2 in a conveying direction and performing heat treatment on the glass ribbon G; and a cooling step of conveying the heat-treated glass ribbon G in the conveying direction in the cooling zone 3 and cooling the glass ribbon G to a temperature near room temperature.
The forming step includes an adjustment step: the glass ribbon G flowing down from the forming body 5 is cooled by using the lower refractory bricks 7 of the forming furnace 1, and the thickness unevenness of the glass ribbon G is adjusted (reduced). In the adjustment step, the heat of the glass ribbon G is released to the outside of the furnace by the lower refractory bricks 7, thereby cooling the glass ribbon G.
Here, the cooling in the adjustment stepThe purpose of (a) is to adjust the thickness unevenness of the glass ribbon G, and the purpose of cooling (annealing) in the heat treatment step is to adjust the warpage and deformation of the glass ribbon G, which are different. The temperature of the glass ribbon G in the adjustment step is, for example, 1000 to 1300 ℃, and the temperature of the glass ribbon G in the heat treatment step is, for example, 500 to 1000 ℃. The viscosity of the glass ribbon G in the adjustment step is, for example, 20000 to 300000 poise (poise), and the viscosity of the glass ribbon G in the heat treatment step is, for example, 10 5 ～10 16 Poise (poise).
In the adjustment step, as described above, the joints 9, 10 of the lower refractory brick 7 and the connecting refractory brick 8 change in the width direction position when viewed from the glass ribbon G side, and change in the thickness direction position when viewed from the upstream side. Therefore, in the adjustment step, it is possible to prevent the glass ribbon G from being locally cooled at only a predetermined portion in the width direction at a position facing the joints 9, 10, and to prevent the formation of a rib-like convex defect on the surface of the glass ribbon G. Therefore, a high-quality glass article having excellent surface smoothness can be provided.
The present invention is not limited to the above embodiments, and may be implemented in various ways within a scope not departing from the gist of the present invention.
In the above embodiment, the following description is made with respect to the case: the joints 9, 10 of the lower refractory brick 7 and the connecting refractory brick 8 have two bent portions 9a,10a when viewed from the upstream side in the conveying direction, and are formed in a stepped shape as a whole, but the number of the bent portions 9a,10a is not particularly limited. For example, when the joint 9 of the lower refractory brick 7 is viewed from the upstream side in the transport direction, the number of the folded portions 9a may be one as shown in fig. 5, three as shown in fig. 6, or four or more as shown in fig. 7, for example. Of course, for example, as shown in fig. 8, the joint 9 may be formed in a straight line inclined with respect to the thickness direction, or in a shape having no bent portion, when viewed from the upstream side in the conveying direction. These matters can be similarly applied to the joint 10 of the connecting refractory brick 8.
In the above embodiment, as shown in fig. 9, when the joint 9 of the lower refractory brick 7 is viewed from the glass ribbon G side, the position in the width direction of the upper end point 9d of the joint 9 may be the same as the position in the width direction of the lower end point 9e of the adjacent joint 9. This can more reliably suppress the local cooling.
In the above embodiment, the case where the bent portions 9a,10a are formed by the corner portions where two straight lines intersect has been described, but the bent portions 9a,10a may be formed by curved portions such as circular arcs.
In the above embodiment, the following description is made with respect to the case: the positions of the joints 9, 10 of the lower refractory bricks 7 and the connecting refractory bricks 8 in the width direction change in the conveyance direction when viewed from the glass ribbon G side, and (2) the positions of the joints 9 of the lower refractory bricks 7 in the width direction change in the thickness direction when viewed from the upstream side in the conveyance direction, but the positions of the joints in the width direction at least satisfy any one of the above (1) and (2). When the above (1) is satisfied only, the joint is linear in the thickness direction when viewed from the upstream side in the conveyance direction, and when the above (2) is satisfied only, the joint is linear in the conveyance direction when viewed from the glass ribbon G side.
In the above embodiment, the case where the glass ribbon G is formed by the overflow downdraw method has been described, but the glass ribbon G may be formed by other downdraws such as the slot downdraw method and the redraw method.
Description of the reference numerals
1. Forming furnace
2. Heat treatment furnace
3. Cooling zone
4. Roller pair
5. Molded body
6. Upper refractory brick
7. Lower refractory brick
8. Refractory brick for connection
9. Joint of lower refractory brick
10. Joint of refractory brick for connection
G glass ribbon
Gm molten glass
Claims (8)
1. A method for manufacturing a glass article, comprising:
a forming step of forming a glass ribbon by flowing down molten glass from a forming body in a forming furnace; and
a heat treatment step of conveying the glass ribbon formed in the forming step in a conveying direction and performing heat treatment on the glass ribbon,
the molding step comprises: a step of cooling the glass ribbon by using a lower refractory brick of the forming furnace, the lower refractory brick of the forming furnace being opposed to the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon,
the lower refractory brick is divided into a plurality of pieces in a width direction of the glass ribbon,
when viewed from the upstream side in the conveying direction, the position of the joint between the adjacent lower refractory bricks in the width direction changes in the thickness direction,
the joint between the adjacent lower refractory bricks extends in a direction inclined with respect to the conveyance direction when viewed from the glass ribbon side.
2. The method according to claim 1, wherein a joint between the adjacent lower refractory bricks has a bent portion when viewed from an upstream side in the conveying direction.
3. The method according to claim 1 or 2, wherein the forming furnace includes an upper refractory brick and a connecting refractory brick, the upper refractory brick facing the forming body, and the connecting refractory brick connects a lower end portion of the upper refractory brick and an upper end portion of the lower refractory brick so that the lower refractory brick is closer to the glass ribbon than the upper refractory brick.
4. The method according to claim 3, wherein the connecting refractory bricks are divided into a plurality of segments in the width direction, and a position of a joint between adjacent connecting refractory bricks in the width direction changes in the thickness direction when viewed from an upstream side in the conveying direction.
5. The method according to claim 4, wherein a joint between adjacent refractory bricks for connection has a bent portion when viewed from an upstream side in the conveying direction.
6. The method according to claim 4 or 5, wherein a position of a joint between adjacent connecting refractory bricks in the width direction changes in the conveyance direction when viewed from the glass ribbon side.
7. The method according to claim 6, wherein a joint between adjacent connecting refractory bricks extends in a direction inclined with respect to the conveyance direction when viewed from the glass ribbon side.
8. A method for manufacturing a glass article, comprising:
a forming step of forming a glass ribbon by flowing down molten glass from a forming body in a forming furnace; and
a heat treatment step of conveying the glass ribbon formed in the forming step in a conveying direction and performing heat treatment on the glass ribbon,
the molding step comprises: a step of cooling the glass ribbon by using a lower refractory brick of the forming furnace, the lower refractory brick of the forming furnace being opposed to the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon,
the lower refractory brick is divided into a plurality of pieces in a width direction of the glass ribbon,
the position of the joint between the adjacent lower refractory bricks in the width direction changes in the conveyance direction when viewed from the glass ribbon side,
the joint between the adjacent lower refractory bricks extends in a direction inclined with respect to the conveyance direction when viewed from the glass ribbon side.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018201712 | 2018-10-26 | ||
| JP2018-201712 | 2018-10-26 | ||
| PCT/JP2019/041294 WO2020085297A1 (en) | 2018-10-26 | 2019-10-21 | Glass article manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112867697A CN112867697A (en) | 2021-05-28 |
| CN112867697B true CN112867697B (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980069167.4A Active CN112867697B (en) | 2018-10-26 | 2019-10-21 | Method for manufacturing glass article |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7415252B2 (en) |
| KR (1) | KR20210082443A (en) |
| CN (1) | CN112867697B (en) |
| TW (1) | TWI799659B (en) |
| WO (1) | WO2020085297A1 (en) |
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| WO2017110212A1 (en) * | 2015-12-22 | 2017-06-29 | 日本電気硝子株式会社 | Plate glass manufacturing apparatus and plate glass manufacturing method |
| CN108373167A (en) * | 2018-03-08 | 2018-08-07 | 新疆湘晟新材料科技有限公司 | Titanium tetrachloride boiling chloridizing furnace stops gas brick lining and brickwork method |
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| JP2016104676A (en) | 2013-03-21 | 2016-06-09 | 旭硝子株式会社 | Float glass manufacturing apparatus and float glass manufacturing method |
| JP6597953B2 (en) | 2015-04-30 | 2019-10-30 | 日本電気硝子株式会社 | Sheet glass manufacturing apparatus and sheet glass manufacturing method |
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2019
- 2019-10-21 CN CN201980069167.4A patent/CN112867697B/en active Active
- 2019-10-21 JP JP2020553387A patent/JP7415252B2/en active Active
- 2019-10-21 KR KR1020217010436A patent/KR20210082443A/en not_active Application Discontinuation
- 2019-10-21 WO PCT/JP2019/041294 patent/WO2020085297A1/en active Application Filing
- 2019-10-25 TW TW108138647A patent/TWI799659B/en active
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| US3362698A (en) * | 1966-01-26 | 1968-01-09 | Detrick M H Co | Refractory lining structure for a rotary kiln |
| JPH07252517A (en) * | 1994-03-10 | 1995-10-03 | Tokyo Yogyo Co Ltd | Aod furnace |
| CN101028964A (en) * | 2007-02-08 | 2007-09-05 | 河南安彩高科股份有限公司 | Device and method for controlling glass-board thickness evenness |
| CN102471121A (en) * | 2009-07-13 | 2012-05-23 | 旭硝子株式会社 | Glass plate manufacturing method and manufacturing device |
| WO2012026136A1 (en) * | 2010-08-27 | 2012-03-01 | ＡｖａｎＳｔｒａｔｅ株式会社 | Device for manufacturing glass substrate and method for manufacturing glass substrate |
| JP2014193780A (en) * | 2013-03-28 | 2014-10-09 | Avanstrate Inc | Glass plate manufacturing method and glass plate manufacturing device |
| WO2015125943A1 (en) * | 2014-02-21 | 2015-08-27 | ＡｖａｎＳｔｒａｔｅ株式会社 | Glass plate production method and glass plate production device |
| WO2017110212A1 (en) * | 2015-12-22 | 2017-06-29 | 日本電気硝子株式会社 | Plate glass manufacturing apparatus and plate glass manufacturing method |
| CN108373167A (en) * | 2018-03-08 | 2018-08-07 | 新疆湘晟新材料科技有限公司 | Titanium tetrachloride boiling chloridizing furnace stops gas brick lining and brickwork method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020085297A1 (en) | 2020-04-30 |
| KR20210082443A (en) | 2021-07-05 |
| CN112867697A (en) | 2021-05-28 |
| JP7415252B2 (en) | 2024-01-17 |
| JPWO2020085297A1 (en) | 2021-09-24 |
| TW202106636A (en) | 2021-02-16 |
| TWI799659B (en) | 2023-04-21 |
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