CN112867697A - Method for manufacturing glass article - Google Patents
Method for manufacturing glass article Download PDFInfo
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- CN112867697A CN112867697A CN201980069167.4A CN201980069167A CN112867697A CN 112867697 A CN112867697 A CN 112867697A CN 201980069167 A CN201980069167 A CN 201980069167A CN 112867697 A CN112867697 A CN 112867697A
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- glass ribbon
- refractory bricks
- glass
- joint
- forming
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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
-
- 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 provides 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 is a method for manufacturing a glass article, including: a forming 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 along the conveying direction and performing heat treatment on the glass ribbon (G). The forming process comprises: and a step of cooling the glass ribbon (G) by using lower refractory bricks (7) of the molding furnace (1), wherein the lower refractory bricks (7) of the molding furnace (1) are opposed to the surface of the glass ribbon (G) that has flowed down from the molding body (5) in the thickness direction of the glass ribbon (G). The lower refractory bricks (7) are divided into a plurality of pieces in the width direction of the glass ribbon (G), and when viewed from the upstream side in the conveyance direction, the position of the joint (9) between the adjacent lower refractory bricks (7) in the width direction changes in the thickness direction.
Description
Technical Field
The present invention relates to a method for manufacturing a glass article.
Background
Examples of the method for producing a glass article include down-draw methods such as an overflow down-draw method, a slit down-draw method, and a redraw method.
A method for manufacturing a glass article using such a down-draw method includes: 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 applying a heat treatment (annealing treatment) for reducing warpage and strain to the glass ribbon (see, for example, patent document 1). After the heat treatment step, the glass ribbon cooled to near room temperature is cut into a predetermined length to produce a glass sheet, or wound into a roll to produce a glass roll.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-122124
Disclosure of Invention
Problems to be solved by the invention
In the above-described forming step, the 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, the heat of the glass ribbon is released to the outside of the furnace by using lower refractory bricks of a forming furnace that face the surface of the glass ribbon in the thickness direction of the glass ribbon, thereby cooling the glass ribbon.
However, the lower refractory bricks may be divided into a plurality of pieces in the width direction of the glass ribbon in consideration of ease of replacement and the like. However, in the case of this structure, there is a possibility that a streak-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 the adjacent lower refractory bricks. When such a rib-like convex defect is formed, the smoothness of the surface of the produced glass article is lost, and there is a problem that a high-quality glass article cannot be produced.
Here, the rib-like convex defect is considered to be generated for the following reason. That is, the gas easily flows through the joint of the lower refractory bricks inside and outside the molding furnace. As a result, the heat of the glass ribbon is increased at the position facing the joint of the lower refractory bricks, and only a predetermined portion of the glass ribbon is easily cooled locally. When such local cooling occurs, the surface of the glass ribbon is considered to be locally shrunk and raised, thereby causing a rib-like convex defect.
The invention provides 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 is made to solve the above problems, is 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 carrying the glass ribbon formed in the forming step along a carrying direction and performing heat treatment on the glass ribbon, wherein the forming step includes: and a step of cooling the glass ribbon by using lower refractory bricks of a forming furnace, the lower refractory bricks of the forming furnace facing the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon, the lower refractory bricks being divided into a plurality of pieces in the width direction of the glass ribbon, and the position of the joint between the adjacent lower refractory bricks in the width direction changing in the thickness direction of the glass ribbon when viewed from the upstream side in the conveying direction. This prevents gas from flowing between the inside and outside of the forming furnace through the joint of the lower refractory bricks, thereby improving the sealing property of the joint of the lower refractory bricks. Therefore, it is possible to prevent only a predetermined portion of the glass ribbon from being locally cooled at a position facing the joint of the lower refractory bricks, and to prevent formation of a streak-like convex defect on the surface of the glass ribbon.
In the above configuration, it is preferable that: the joint between the adjacent lower refractory bricks has a bent portion when viewed from the upstream side in the conveyance direction. This further bends the joint of the lower refractory bricks by the bent portion, thereby further improving the sealing property. Therefore, it is possible to more reliably suppress the local cooling of only the predetermined member of the glass ribbon at the position facing the joint.
In the above configuration, it is preferable that: when viewed from the glass ribbon side, the position of the joint between the adjacent lower refractory bricks in the width direction changes in the conveyance direction. As a result, the position at which the glass ribbon faces the joint of the lower refractory bricks changes, and therefore, it is possible to more reliably suppress local cooling of only a predetermined portion of the glass ribbon.
In the above configuration, it is preferable that: 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. Accordingly, the position at which the glass ribbon faces the joint of the lower refractory bricks is continuously changed, and therefore, it is possible to more reliably suppress the local cooling of only the predetermined portion of the glass ribbon.
In the above configuration, the forming furnace may include upper refractory bricks facing the formed body, and connecting refractory bricks connecting lower ends of the upper refractory bricks and upper ends of the lower refractory bricks such that the lower refractory bricks are closer to the glass ribbon side than the upper refractory bricks. Thus, the lower refractory bricks are brought close to the glass ribbon, and the space between the lower refractory bricks and the glass ribbon can be reduced.
In the above configuration, it is preferable that: the connecting refractory bricks are divided into a plurality of blocks in the width direction, and when viewed from the upstream side in the conveyance direction, the positions of the joints between adjacent connecting refractory bricks in the width direction vary in the thickness direction of the glass ribbon. This improves the sealing properties of the joint of the joining refractory bricks. Therefore, the gas inside and outside the molding furnace is not easily directly circulated through the joint of the joining refractory bricks. Therefore, it is possible to prevent only the predetermined member of the glass ribbon from being locally cooled at the position facing the joint of the refractory bricks for connection, and to prevent the formation of the rib-like convex defect.
In the above configuration, it is preferable that: the joint between adjacent refractory bricks for connection has a bent portion when viewed from the upstream side in the conveyance direction. This further improves the sealing property by bending the joint of the refractory bricks for connection by the bent portion. Therefore, it is possible to more reliably suppress the local cooling of only the predetermined member of the glass ribbon at the position facing the joint.
In the above configuration, it is preferable that: when viewed from the glass ribbon side, the position of the joint between the adjacent refractory bricks for connection in the width direction changes in the conveyance direction. As a result, the position at which the glass ribbon faces the joint of the joining refractory bricks changes, and therefore, it is possible to more reliably suppress local cooling of only a predetermined portion of the glass ribbon.
In the above configuration, it is preferable that: when viewed from the glass ribbon side, the joints between the adjoining refractory bricks for joining extend in a direction inclined with respect to the conveyance direction. Thus, the position at which the glass ribbon faces the joint of the joining refractory bricks is continuously changed, and therefore, it is possible to more reliably suppress the local cooling of only the predetermined portion of the glass ribbon.
The present invention, which is made to solve the above problems, is 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 carrying the glass ribbon formed in the forming step along a carrying direction and performing heat treatment on the glass ribbon, wherein the forming step includes: and a step of cooling the glass ribbon by using lower refractory bricks of a forming furnace, the lower refractory bricks of the forming furnace facing the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon, the lower refractory bricks being divided into a plurality of pieces in the width direction of the glass ribbon, and when viewed from the glass ribbon side, the position of the joint between the adjacent lower refractory bricks in the width direction changes in the conveyance direction. This changes the position at which the glass ribbon faces the joint of the lower refractory bricks, and therefore, it is possible to suppress local cooling of only a predetermined portion of the glass ribbon. Therefore, the formation of the 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 taken along line A-A of FIG. 1, showing the state of the joint between the lower refractory bricks and the connecting refractory bricks when viewed from the glass ribbon side.
FIG. 3 is a sectional view taken along line B-B of FIG. 1, showing the state of the joint of the lower firebricks when viewed from the upstream side in the conveyance direction.
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1, showing the state of the joint of the refractory bricks for joining when viewed from the upstream side in the conveyance direction.
Fig. 5 is a cross-sectional view showing a modification of the joint of the lower refractory bricks when viewed from the upstream side in the conveyance direction.
Fig. 6 is a cross-sectional view showing a modification of the joint of the lower refractory bricks when viewed from the upstream side in the conveyance direction.
Fig. 7 is a cross-sectional view showing a modification of the joint of the lower refractory bricks when viewed from the upstream side in the conveyance direction.
Fig. 8 is a cross-sectional view showing a modification of the joint of the lower refractory bricks when viewed from the upstream side in the conveyance direction.
FIG. 9 is a sectional view taken along line A-A of FIG. 1, showing a modification of the joint of the lower firebricks when viewed from the glass ribbon side.
Detailed Description
Hereinafter, one embodiment of the present invention will be described based on the attached drawings. XYZ in the figure is an orthogonal coordinate system. The X direction and the Y direction are horizontal directions, and the Z direction is a vertical direction. While the glass ribbon G is conveyed in the longitudinal posture, the X direction is the thickness direction of the glass ribbon G (hereinafter also simply referred to as "thickness direction"), the Y direction is the width direction of the glass ribbon G (hereinafter also simply referred to as "width direction"), and the Z direction is 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, which embodies the method for manufacturing a glass article according to the present embodiment, is an apparatus for continuously forming a glass ribbon G. Glass articles produced from the glass ribbon G include glass plates and glass rolls.
The glass article manufacturing device is provided with: a forming furnace 1 for forming a glass ribbon G, a heat treatment furnace 2 for heat-treating the glass ribbon G, a cooling zone 3 for cooling the glass ribbon G to a temperature near room temperature, and a pair of rollers 4 provided in the heat treatment furnace 2 and the cooling zone 3 in a plurality of stages up and down.
Here, the glass article manufacturing apparatus may further include, downstream 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, downstream 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 the molten glass Gm by the overflow downdraw method is disposed in the internal space of the forming furnace 1. The molten glass Gm supplied to the forming body 5 overflows from the groove portion 5a formed at the top of the forming body 5, and the overflowing molten glass Gm merges at the lower end along both side surfaces 5b of the forming body 5 having a cross-sectional wedge shape, whereby the sheet-like glass ribbon G is continuously formed. The formed glass ribbon G is in a longitudinal position (preferably a vertical position).
The molding furnace 1 includes: the refractory bricks 6 and 7, and the connecting refractory bricks 8 connecting the lower ends of the upper refractory bricks 6 and the upper ends of the lower refractory bricks 7. The connecting refractory bricks 8 connect the upper refractory bricks 6 and the lower refractory bricks 7 so that the lower refractory bricks 7 are closer to the glass ribbon G side than the upper refractory bricks 6. The refractory bricks for connection 8 may be omitted.
The temperature of the molten glass Gm flowing down the surface of the formed body 5 is adjusted at a position corresponding to the upper refractory bricks 6. The temperature of the molten glass Gm flowing down over the surface of the molded body 5 can be adjusted by a heating device (not shown) such as a heater provided at a position corresponding to the upper refractory bricks 6, for example. The heating device may be provided inside or outside the furnace of the upper refractory bricks 6. Alternatively, the heating device may be embedded in the upper firebricks 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 glass ribbon G is cooled using the lower refractory bricks 7. The cooling is performed to adjust the thickness unevenness of the glass ribbon G by radiating the heat of the glass ribbon G to the outside of the furnace through the lower refractory bricks 7. That is, the lower refractory bricks 7 correspond to the heat release zone. A heating device such as a heater is not provided at a position corresponding to the lower refractory bricks 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 in a downward direction. The glass ribbon G in the vertical posture is annealed (annealed) so that the temperature thereof becomes lower as it moves downward in the internal space of the heat treatment furnace 2. This annealing is performed 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, for example. The heating device may be disposed inside or outside the heat treatment furnace 2. Alternatively, the heating device may be embedded 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 the front and back sides, respectively. The roller pair 4 is not provided in a region from the lower end of the formed body 5 to the lower end of the lower refractory bricks 7.
The uppermost roller pair 4a of the plurality of roller pairs 4 is provided near the upper end of the heat treatment furnace 2, and is constituted by a cooling roller (edge roller) that cools both ends of the glass ribbon G in the width direction. The cooling roll is used to suppress the shrinkage of the glass ribbon G in the width direction.
The plurality of roller pairs 4 may include a roller pair 4 that does not pinch the end portion of the glass ribbon G in the width direction in the internal space of the heat treatment furnace 2. In other words, the facing distance between the roller pairs 4 may be made larger than the thickness of the end portions of the glass ribbon G in the width direction, and the glass ribbon G may be passed between the roller pairs 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 connecting refractory bricks 8 may be of a seamless integral 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 bricks 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 refractory bricks for connection 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 position in the width direction at which the glass ribbon G faces the joints 9, 10 changes sequentially in the conveyance direction, and therefore, it is possible to suppress the glass ribbon G from being locally cooled continuously only at a predetermined portion in the width direction. In the example shown in the figure, the inclination direction of the seam 9 and the inclination direction of the seam 10 are opposite to each other, but may be the same. The joint 9 (or the joint 10) may include a joint having different directions of inclination. Further, if the positions of the joints 9, 10 in the width direction change in the conveyance direction when viewed from the glass ribbon G side, the form of change of the joints 9, 10 is not limited to a straight line. However, if the shape is linear, there is an advantage that the bricks 7 and 8 can be easily processed.
As shown in fig. 3, the joint 9 of the lower refractory bricks 7 has a bent portion 9a when viewed from the upstream side in the conveyance direction, and the position in the width direction changes in the thickness direction. Similarly, as shown in fig. 4, the joint 10 of the refractory bricks for connection 8 also has a bent portion 10a when viewed from the upstream side in the conveyance direction, and the position in the width direction changes in the thickness direction. This improves the sealing property of the joints 9 and 10, and therefore, the gas inside and outside the molding furnace 1 is not easily directly circulated through the joints 9 and 10. Therefore, at the position where the glass ribbon G faces the joints 9, 10, it is possible to suppress local cooling of a predetermined portion in the width direction of the glass ribbon G.
In the present embodiment, the joint 9 of the lower refractory bricks 7 has two bent portions 9 a. By these bent portions 9a, the seam 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 as a whole, assumes a stepped shape (hook shape). Similarly, the joint 10 of the connecting refractory bricks 8 also has two bent portions 10 a. By these bent portions 10a, the seam 10 has two first portions 10b extending in the thickness direction and a second portion 10c extending in the width direction between these first portions 10b, and as a whole, assumes a stepped shape (hook shape). That is, the joints 9, 10 are relatively simple in shape, but the second portions 9c, 10c extending in the width direction have a large resistance to the gas passing through the joints 9, 10, and therefore, the gas is not easily circulated.
Here, in the present embodiment, when viewed from the upstream side in the conveyance direction, the position P1 (or the position P2) facing the inside of the furnace of the joint 9 of the lower refractory bricks 7 shown in fig. 3 and the position Q1 (or the position Q2) facing the inside of the furnace of the joint 10 of the connecting refractory bricks 8 shown in fig. 4 do not overlap and differ in the width direction. That is, the position P1 (or the position P2) of the joint 9 of the lower refractory bricks 7 is located at the portion of the joint 8 without the joint 10, and the position Q1 (or the position Q2) of the joint 10 of the connecting refractory bricks 8 is located at the portion of the joint 7 without the joint 9. 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 region of the joint 9 of the lower refractory bricks 7 formed over the entire length in the conveyance direction does not overlap with the region of the joint 10 of the connecting refractory bricks 8 formed over the entire length in the conveyance direction 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 bricks 7 on the one 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 bricks 7 on the other side facing the other surface of the glass ribbon G do not overlap and differ from each other in the width direction. That is, the position of the joint 9 of one of the lower refractory bricks 7 facing the inside of the furnace faces the portion of the other lower refractory brick 7 having no joint 9 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 bricks 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 bricks 8 on the other side facing the other surface of the glass ribbon G do not overlap and differ from each other in the width direction. That is, the position of the joint 10 of one connecting refractory brick 8 facing the inside of the furnace faces the part of the other connecting refractory brick 8 without the joint 10 in the thickness direction. Thereby, the influence of the joints 9, 10 is distributed over both surfaces of the glass ribbon G. Fig. 3 and 4 illustrate the following embodiments, respectively: a configuration in which 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 do not overlap each other in the width direction when viewed from the upstream side in the conveyance direction; and a configuration in which the formation regions of the joints 10 of the connecting refractory bricks 8 on the opposite sides over the entire length in the thickness direction do not overlap each other in the width direction when viewed from the upstream side in the conveyance direction.
In the present embodiment, the bent portion 10a (or the second portion 10c) of the joint 10 in the connecting refractory bricks 8 is located outside the upper refractory bricks 6, that is, outside the furnace. Thus, the portion of the joint 10 facing the inside of the furnace is constituted only by the linear first portion 10b along the thickness direction, and the shape of the joint 10 facing the inside of the furnace is simplified. The bent portion 10a (or the second portion 10c) of the joint 10 in the connecting refractory bricks 8 may be located below the upper refractory bricks 6, or may be located inside the furnace inside the upper refractory bricks 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 forming step of forming a glass ribbon G by flowing down molten glass Gm from a forming body 5 in a forming furnace 1; a heat treatment step of conveying the glass ribbon G formed in the heat treatment furnace 2 along the conveyance direction and heat-treating 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 adjusting 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 conditioning step, the heat of the glass ribbon G is released to the outside of the furnace through the lower refractory bricks 7, thereby cooling the glass ribbon G.
Here, the cooling in the adjustment step is intended to adjust the thickness unevenness of the glass ribbon G, and the cooling (annealing) in the heat treatment step is intended to adjust the warpage and strain of the glass ribbon G, which are different from each other. The temperature of the glass ribbon G in the adjusting 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 adjusting 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, 105～1016Poise (poise).
In the adjustment step, as described above, the position in the width direction of the joints 9, 10 of the lower refractory bricks 7 and the connecting refractory bricks 8 changes in the conveyance direction when viewed from the glass ribbon G side, and changes in the thickness direction when viewed from the upstream side in the conveyance direction. Therefore, in the adjustment step, it is possible to suppress the local cooling of only a predetermined portion of the glass ribbon G in the width direction at the position facing the joints 9, 10, and it is possible to prevent the formation of the 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 can be implemented in various forms without departing from the scope of the present invention.
The above embodiment has been described with respect to the following cases: the joints 9, 10 of the lower refractory bricks 7 and the connecting refractory bricks 8 have two bent portions 9a, 10a when viewed from the upstream side in the conveyance direction, and are stepped 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 bricks 7 is viewed from the upstream side in the conveying direction, for example, one bent portion 9a may be provided as shown in fig. 5, three bent portions 9 may be provided as shown in fig. 6, or four or more bent portions 9a may be provided as shown in fig. 7. Of course, as shown in fig. 8, for example, when viewed from the upstream side in the conveyance direction, the joint 9 may be formed into a shape having no bent portion, such as a straight line shape inclined with respect to the thickness direction. These matters can be similarly applied to the joint 10 of the refractory bricks 8 for joining.
In the above embodiment, as shown in fig. 9, when the joint 9 of the lower refractory bricks 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 and 10a are formed by the corner portions where two straight lines intersect each other has been described, but the bent portions 9a and 10a may be formed by curved portions such as circular arcs.
The above embodiment has been described with respect to the following cases: the joints 9, 10(1) of the lower refractory bricks 7 and the connecting refractory bricks 8 change in position in the width direction in the conveyance direction when viewed from the glass ribbon G side, and (2) change in position in the width direction in the thickness direction when viewed from the upstream side in the conveyance direction, but the position of the joint 9 of the lower refractory bricks 7 in the width direction may at least satisfy any of the above (1) and (2). In the case where only the above (1) is satisfied, the joint is linear along the thickness direction when viewed from the upstream side in the conveyance direction, and in the case where only the above (2) is satisfied, the joint is linear along 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 another downdraw method such as a slit downdraw method or a redraw method.
Description of the reference numerals
1 Forming furnace
2 Heat treatment furnace
3 cooling zone
4 roller pair
5 shaped body
6 upper refractory brick
7 lower refractory brick
8-joint refractory brick
9 joints of lower refractory bricks
10 joint of refractory brick for joining
G glass ribbon
Gm molten glass.
Claims (10)
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 carrying the glass ribbon formed in the forming step along a carrying direction and performing heat treatment on the glass ribbon,
the forming step includes: a step of cooling the glass ribbon by using lower refractory bricks of the forming furnace, the lower refractory bricks of the forming furnace facing the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon,
the lower refractory bricks are divided into a plurality of pieces in the width direction of the glass ribbon,
the position of the joint between the adjacent lower refractory bricks in the width direction changes in the thickness direction when viewed from the upstream side in the conveyance direction.
2. The method for manufacturing a glass article 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 conveyance direction.
3. The method for manufacturing a glass article according to claim 1 or 2, wherein a position of a joint between the adjacent lower refractory bricks in the width direction changes in the conveyance direction when viewed from the glass ribbon side.
4. The glass article manufacturing method according to claim 3, wherein a 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.
5. The method for manufacturing a glass article according to any one of claims 1 to 4, wherein the forming furnace includes upper refractory bricks that face the forming body, and connecting refractory bricks that connect lower ends of the upper refractory bricks and upper ends of the lower refractory bricks such that the lower refractory bricks are closer to the glass ribbon side than the upper refractory bricks.
6. The method for manufacturing a glass article according to claim 5, wherein the connecting refractory brick is divided into a plurality of pieces in the width direction, and when viewed from an upstream side in the conveyance direction, a position of a joint between the adjacent connecting refractory bricks in the width direction changes in the thickness direction.
7. The method for manufacturing a glass article according to claim 6, wherein a joint between the adjacent joining refractory bricks has a bent portion when viewed from an upstream side in the conveyance direction.
8. The method for manufacturing a glass article according to claim 6 or 7, wherein a position of a joint between the adjacent joining firebricks in the width direction changes in the conveyance direction when viewed from the glass ribbon side.
9. The method for manufacturing glass articles according to claim 8, wherein a joint between the adjoining refractory bricks for connection extends in a direction inclined with respect to the conveyance direction when viewed from the glass ribbon side.
10. 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 carrying the glass ribbon formed in the forming step along a carrying direction and performing heat treatment on the glass ribbon,
the forming step includes: a step of cooling the glass ribbon by using lower refractory bricks of the forming furnace, the lower refractory bricks of the forming furnace facing the surface of the glass ribbon flowing down from the forming body in the thickness direction of the glass ribbon,
the lower refractory bricks are divided into a plurality of pieces in the 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.
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 true CN112867697A (en) | 2021-05-28 |
| CN112867697B CN112867697B (en) | 2023-05-23 |
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| CN201980069167.4A Active CN112867697B (en) | 2018-10-26 | 2019-10-21 | Method for manufacturing glass article |
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| 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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| WO2013105667A1 (en) * | 2012-01-13 | 2013-07-18 | ＡｖａｎＳｔｒａｔｅ株式会社 | Manufacturing device and molding device for glass substrate |
| JP5994992B2 (en) | 2012-12-20 | 2016-09-21 | 日本電気硝子株式会社 | Sheet glass manufacturing apparatus and sheet glass manufacturing method |
| 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 JP JP2020553387A patent/JP7415252B2/en active Active
- 2019-10-21 WO PCT/JP2019/041294 patent/WO2020085297A1/en active Application Filing
- 2019-10-21 KR KR1020217010436A patent/KR20210082443A/en not_active Application Discontinuation
- 2019-10-21 CN CN201980069167.4A patent/CN112867697B/en active Active
- 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 |
|---|---|
| KR20210082443A (en) | 2021-07-05 |
| JPWO2020085297A1 (en) | 2021-09-24 |
| CN112867697B (en) | 2023-05-23 |
| TWI799659B (en) | 2023-04-21 |
| TW202106636A (en) | 2021-02-16 |
| JP7415252B2 (en) | 2024-01-17 |
| WO2020085297A1 (en) | 2020-04-30 |
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