CN117561224A - Method and apparatus for manufacturing glass article - Google Patents
Method and apparatus for manufacturing glass article Download PDFInfo
- Publication number
- CN117561224A CN117561224A CN202280045248.2A CN202280045248A CN117561224A CN 117561224 A CN117561224 A CN 117561224A CN 202280045248 A CN202280045248 A CN 202280045248A CN 117561224 A CN117561224 A CN 117561224A
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- Prior art keywords
- glass ribbon
- glass
- roller
- cooling
- temperature
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- 239000011521 glass Substances 0.000 title claims abstract description 263
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 144
- 239000006060 molten glass Substances 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 238000003280 down draw process Methods 0.000 claims abstract description 7
- 239000007791 liquid phase Substances 0.000 claims description 7
- 238000010792 warming Methods 0.000 claims description 2
- 238000000137 annealing Methods 0.000 description 18
- 238000005520 cutting process Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 3
- 239000005358 alkali aluminosilicate glass Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910000510 noble metal Inorganic materials 0.000 description 3
- 238000007500 overflow downdraw method Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000009751 slip forming Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001260 Pt alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect 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
- 239000011449 brick Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000003426 chemical strengthening reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 method for manufacturing the glass article comprises the following steps: a forming step of forming a Glass Ribbon (GR) from a molten Glass (GM) by a down-draw method; a cooling step of bringing the Glass Ribbon (GR) into contact with a roller section (14) of a cooling roller (12); and a temperature increasing step of increasing the temperature of the Glass Ribbon (GR) by heating the Glass Ribbon (GR) after the cooling step.
Description
Technical Field
The present invention relates to a method and apparatus for manufacturing glass articles such as glass ribbons.
Background
In displays such as liquid crystal displays and organic EL displays, and organic EL lighting, glass plates are used as substrates and covers. As a method for producing these glass sheets, an overflow downdraw method is known.
The overflow downdraw process is the following: the molten glass is flowed into an overflow trough provided on the upper portion of a forming body having a substantially wedge-shaped cross section, and the molten glass flowed out of the overflow trough to both sides is flowed down along both side surfaces of the forming body, and the molten glass is fused and integrated at the lower end portion of the forming body, whereby one glass ribbon is continuously formed.
The glass ribbon thus formed is conveyed in a state of being given an appropriate tension by conveying rollers disposed below the forming body. Thereby, the thickness of the glass ribbon can be controlled.
In the above-described production method, in order to impart an appropriate tension to the glass ribbon, it is necessary to make the viscosity of the molten glass supplied to the forming body relatively high. When the viscosity of the molten glass is low, a proper tension cannot be applied to the glass ribbon, and the thickness of the glass ribbon cannot be controlled by combining the influence of gravity.
In order to prevent this, for example, in the method for manufacturing a glass sheet disclosed in patent document 1, a roll (forming roll) disposed below a forming body (isopipe) is used. In this method, a glass ribbon (glass flow) formed from a formed body is brought into contact with rollers and cooled, so that the viscosity of the glass ribbon can be increased (see paragraph 0120 of the document). In this manufacturing method, the slip of the glass ribbon with respect to the rolls is prevented by the adhesive force acting between the rolls and the glass ribbon (refer to claim 1 of this document).
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2011-505122
Disclosure of Invention
Problems to be solved by the invention
In the above-described conventional manufacturing method, the viscosity of the glass ribbon formed by the forming body can be controlled by bringing the glass ribbon into contact with the rollers.
However, when a glass ribbon formed from molten glass is brought into contact with the rolls, the temperature of one main surface that contacts the rolls is lower than the temperature of the other main surface that does not contact the rolls, resulting in a temperature difference.
When this temperature difference occurs, warpage occurs in the glass ribbon. When the glass ribbon is warped, breakage may occur in the glass ribbon during conveyance. In addition, breakage may occur when the glass ribbon is cut, which may cause cutting failure.
The present invention has been made in view of the above circumstances, and an object of the present invention is to alleviate warpage generated in a glass ribbon after molding.
Means for solving the problems
The present invention provides a method for manufacturing a glass article for solving the above-mentioned problems, comprising: a forming step of forming a glass ribbon from the molten glass by a down-draw method; and a cooling step of bringing the glass ribbon into contact with a roller portion of a cooling roller, wherein the glass ribbon includes end portions in a width direction and a center portion in the width direction, and the method for manufacturing the glass article includes: a first main surface which is not in contact with the roller portion of the cooling roller; and a second main surface that is in contact with the roller portion of the cooling roller, wherein in the cooling step, the end portion in the width direction and the center portion in the width direction of the glass ribbon are brought into contact with the roller portion of the cooling roller via the second main surface, and wherein the method for producing the glass article includes a temperature increasing step of increasing the temperature of the glass ribbon by heating the glass ribbon after the cooling step.
According to this configuration, in the cooling step, the second main surface of the glass ribbon is brought into contact with the roller portion of the cooling roller, and a difference occurs between the temperature on the second main surface side and the temperature on the first main surface side, and as a result, the glass ribbon warps. In the temperature increasing step, the glass ribbon is heated after the cooling step to increase the temperature, so that the warp of the glass ribbon can be alleviated.
In the temperature increasing step, the glass ribbon may be heated by a temperature increasing heater disposed on the second main surface side. In the cooling step, a difference occurs between the temperature on the second principal surface side and the temperature on the first principal surface side of the glass ribbon, but in the heating step, the second principal surface is effectively heated, so that the difference in glass ribbon temperature can be reduced. Accordingly, residual stress generated in the glass ribbon during annealing can be reduced, and as a result, breakage of the glass ribbon or glass sheet during cutting due to the residual stress can be suppressed.
The temperature increasing heater may have a length extending in the width direction of the glass ribbon. Accordingly, the glass ribbon can be heated uniformly along the width direction thereof in accordance with the length of the temperature increasing heater.
In the method, the temperature-increasing heater may include a plurality of temperature-increasing heaters arranged along a longitudinal direction of the glass ribbon. The glass ribbon is heated by the plurality of heating heaters, and thus warping of the glass ribbon can be effectively suppressed.
In the present method, an end cooling step of cooling the end portion of the glass ribbon in the width direction while sandwiching the end portion with edge rollers may be included after the temperature increasing step. This suppresses shrinkage of the glass ribbon in the width direction and also suppresses warpage of the glass ribbon due to the shrinkage. Further, by performing the temperature increasing step before the end cooling step, the time required for increasing the temperature to a temperature at which warpage can be alleviated can be shortened, and the glass ribbon can be manufactured efficiently.
In the cooling step, the end portion of the glass ribbon in the width direction may be sandwiched between the roller portion of the cooling roller and the roller portion of the guide roller. This can suppress shrinkage of the glass ribbon in the width direction. In addition, the slippage of the glass ribbon with respect to the cooling roll can also be suppressed.
In the method, the molten glass may have a liquid phase viscosity of 10 4.5 dPa.s or less. Such molten glass having a low liquid-phase viscosity is difficult to form in overflow forming without using a cooling roll, but according to the present invention, a high-quality glass ribbon can be formed.
In addition, the viscosity of the molten glass at 1000℃may be 10 7.0 dPa.s or more. Since a glass ribbon formed from such a high-viscosity molten glass has low wettability and is difficult to adhere to a cooling roll, slippage is likely to occur between the glass ribbon and the cooling roll. Therefore, the effect of suppressing the slip by the present invention becomes remarkable.
The present invention provides a glass article manufacturing apparatus for solving the above problems, comprising: forming a glass ribbon from the molten glass by a downdraw process; and a cooling roller that cools the glass ribbon, wherein the glass ribbon includes an end portion in a width direction and a center portion in the width direction, the cooling roller includes a roller portion that contacts the end portion in the width direction and the center portion in the width direction of the glass ribbon, and the glass ribbon includes: a first main surface which is not in contact with the roller portion of the cooling roller; and a second main surface that is in contact with the roller portion of the cooling roller, wherein the glass article manufacturing apparatus is provided with a temperature-increasing heater that heats the glass ribbon by heating the glass ribbon after bringing the end portion in the width direction and the central portion in the width direction of the glass ribbon into contact with the roller portion of the cooling roller via the second main surface.
According to this configuration, the second main surface of the glass ribbon formed by the forming body is brought into contact with the roller portion of the cooling roller, and a difference occurs between the temperature on the second main surface side and the temperature on the first main surface side, and as a result, the glass ribbon warps. After the roller portions of the cooling rollers are brought into contact, the temperature-increasing heater heats the glass ribbon to increase the temperature, so that the warp of the glass ribbon can be alleviated.
Effects of the invention
According to the present invention, warpage of the glass ribbon after molding can be alleviated.
Drawings
Fig. 1 is a front view showing a method for manufacturing a glass article according to a first embodiment.
Fig. 2 is a sectional view of fig. 1 from the line of sight II.
Fig. 3 is a front view of the cooling roller and the warming heater.
Fig. 4 is a cross-sectional view of the guide roller.
Fig. 5 is a front view showing a method for manufacturing a glass article according to the second embodiment.
Fig. 6 is a sectional view of VI-VI of fig. 5 along the line of sight.
Fig. 7 is a cross-sectional view showing a method for manufacturing a glass article according to the third embodiment.
Fig. 8 is a cross-sectional view showing a method for manufacturing a glass article according to the fourth embodiment.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 to 4 show a first embodiment of a method for producing a glass article according to the present invention.
Fig. 1 and 2 show a glass article manufacturing apparatus used in the present method. The manufacturing apparatus 1 mainly includes: a forming zone 2; a cooling zone 3 provided below the forming zone 2; a temperature raising region 4 provided below the cooling region 3; and an annealing region 5 provided below the temperature raising region 4.
The forming region 2 includes a forming body 6 for forming a glass ribbon GR from molten glass GM. The formed body 6 is made of refractory bricks of dense zircon, alumina-based, zirconia-based, or the like. The molded body 6 may be provided with a coating of a noble metal (e.g., platinum or a platinum alloy). The noble metal coating can be formed by, for example, sputtering. The noble metal coating may be formed on the entire surface of the molded body 6, or may be formed only in a portion in contact with the molten glass GM.
The forming body 6 is formed in an elongated shape and has an overflow groove 6a formed along the longitudinal direction of the forming body 6 at the top. The forming body 6 includes a pair of side surfaces 7 and a guide portion 8 for guiding (restricting) the end portions of the molten glass GM in the width direction downward.
Each side surface 7 includes a vertical surface portion 9 on the upper side and an inclined surface portion 10 on the lower side. As shown in fig. 2, a pair of vertical surface portions 9 of the pair of side surfaces 7 are formed along the vertical direction. The pair of inclined surface portions 10 are inclined so as to approach each other toward the lower side. The lower end portions of the inclined surface portions 10 are connected to each other, thereby forming a lower end portion 11 of the molded body 6.
In the forming body 6, the molten glass GM overflowed from the overflow trough 6a to both sides is formed into a plate shape while flowing down along each side surface 7. The plate-shaped molten glass GM flowing down each side surface 7 is integrally fused at the lower end 11, and a single glass ribbon GR is continuously formed. The glass ribbon GR includes a first major face GRa and a second major face GRb located on an opposite side of the first major face GRa.
As shown in fig. 1 and 3, the glass ribbon GR includes end portions GRc in the width direction X and a central portion GRd in the width direction X. The end portion GRc of the glass ribbon GR is cut from the central portion GRd and discarded in a later process. The central portion GRd of the glass ribbon GR is removed by the end portions GRc and can become a product.
As the glass, silicate glass, preferably borosilicate glass, soda lime glass, alkali aluminosilicate glass, LAS-based glass, or alkali-free glass is used. If alkali aluminosilicate glass is used, the alkali aluminosilicate glass is subjected to chemical strengthening treatment in a subsequent step, and thus is suitable for a display cover. In addition, when a LAS-based glass is used, a crystallization treatment is performed in a subsequent step, so that the glass is suitable for heat-resistant crystallized glass. If alkali-free glass is used, it is suitable for a substrate of a display. Here, the alkali-free glass means a glass substantially free of alkali components (alkali metal oxides), specifically a glass having a weight ratio of alkali components of 3000ppm or less. The weight ratio of the alkali component is preferably 1000ppm or less, more preferably 500ppm or less, and most preferably 300ppm or less.
The thickness of the glass ribbon GR is, for example, 400 to 1200. Mu.m. The width dimension of the glass ribbon GR is, for example, 400 to 2000mm.
The cooling zone 3 includes a cooling roller 12 that contacts the glass ribbon GR formed by the forming body 6, and a guide roller 13 that sandwiches the glass ribbon GR together with the cooling roller 12.
The cooling roller 12 is disposed below the molded body 6. The distance D1 between the cooling roller 12 and the lower end 11 of the molded body 6 in the vertical direction is, for example, 50 to 150mm. The cooling roller 12 is made of metal, and is formed of heat-resistant steel, for example, and has a cylindrical shape. The cooling roller 12 has a cooling mechanism (not shown) inside. The cooling mechanism supplies a cooling medium to the inside of the cooling roller 12, thereby cooling the cooling roller 12.
The cooling roller 12 has a roller portion 14 and a shaft portion 15 supporting the roller portion 14.
The roller portion 14 has a length dimension greater than the width dimension of the glass ribbon GR. The diameter of the roller portion 14 is, for example, 100 to 1500mm.
The roller portion 14 has a first cooling portion 16 that contacts an end portion GRc of the glass ribbon GR in the width direction X and a second cooling portion 17 that contacts a center portion GRd of the glass ribbon GR in the width direction X. The first cooling portion 16 and the second cooling portion 17 are provided on the outer peripheral surface (surface) of the roller portion 14.
The first cooling portion 16 has a concave-convex shape and is in contact with the end portion GRc of the glass ribbon GR from the second main surface GRb side (contact surface). The concave-convex shape of the first cooling portion 16 is constituted by, for example, a rough surface having a surface roughness Ra (an arithmetic average roughness of JIS B0601-2001) of 100 μm or more, more preferably 200 to 400 μm. In other words, the concave-convex shape of the first cooling portion 16 is constituted by the concave-convex included in the rough surface. The concave-convex shape of the first cooling portion 16 in this case is formed by, for example, performing sand blast processing on the first cooling portion 16.
The shape of the concave-convex of the first cooling portion 16 is not limited to the above example, and may be formed by machining, rolling, or the like on the outer peripheral surface thereof. As the shape of the processing surface, for example, a processing surface formed by knurling, a processing surface formed by screw cutting and having a spiral groove formed therein, a processing surface formed by grooving and having a plurality of grooves formed therein, and the like can be used. The grooves formed by the grooving process may extend in the longitudinal direction of the roller portion 14 or may extend in the circumferential direction of the roller portion 14.
In these cases, the surface of the first cooling portion 16 is a machined surface formed by machining or rolling, and the concave-convex shape of the first cooling portion 16 is constituted by concave-convex included in the machined surface. In this case, the first cooling portion 16 has a concave-convex shape (concave-convex surface) with larger undulation than in the case of performing the blast processing. In the case of using a knurled surface, the surface can be formed by, for example, JIS B0951: 1962, the straight knurling and the diagonal knurling are formed. In this case, the pitch of the grooves on the knurled surface is preferably 0.5mm or more and 1.6mm or less, and the depth of the grooves is preferably 0.5mm or more and 1.0mm or less.
The second cooling portion 17 is constituted by a smooth surface, for example. The second cooling portion 17 is formed by, for example, grinding processing and polishing processing. The second cooling portion 17 contacts the central portion GRd of the glass ribbon GR in the width direction X from the second main surface GRb side.
The shaft portions 15 are provided at respective ends in the longitudinal direction of the roller portion 14. The shaft portion 15 is rotationally driven by a driving mechanism not shown.
As shown in fig. 1 and 4, the guide roller 13 includes a roller portion 18, a shaft portion 19 supporting the roller portion 18, and a cooling mechanism 20.
The roller portion 18 is made of, for example, metal (more specifically, heat-resistant steel). The outer peripheral surface (surface) of the roller 18 has a concave-convex shape and is in contact with the glass ribbon GR.
As shown in fig. 1 and 4, the concave-convex shape of the roller 18 is constituted by one groove 21 formed continuously (annularly) along the circumferential direction of the roller 18 and the outer peripheral surface of the roller 18 excluding the groove 21.
The width W of the groove 21 is, for example, 1.5 to 5.0mm. The depth dimension DP of the groove 21 is, for example, 0.5 to 2.0mm.
The present invention is not limited to the above example, and a plurality of grooves may be formed in the outer peripheral surface of the roller portion 18, or one or more protrusions may be formed. The outer peripheral surface of the roller 18 may not have the grooves 21, but may have a rough surface having a concave-convex shape with a surface roughness Ra of 100 μm or more, preferably 200 to 400 μm, without being limited to the above example. In this case, the concave-convex shape of the roller portion 18 is constituted by the concave-convex included in the rough surface. Alternatively, the outer peripheral surface of the roller portion 18 may be a machined surface having a concave-convex shape formed by machining or rolling. In this case, the concave-convex shape of the outer peripheral surface of the roller portion 18 is constituted by concave-convex included in the machined surface.
As shown in fig. 4, the shaft portion 19 is hollow. The shaft portion 19 is rotationally driven by a driving device not shown.
As shown in fig. 4, the cooling mechanism 20 includes a cooling pipe 22 provided in the hollow shaft portion 19. The cooling pipe 22 has a port 23 for discharging a cooling medium such as air. The cooling medium discharged from the opening 23 flows through the inside of the shaft portion 19 as indicated by an arrow in fig. 4, and cools the shaft portion 19 and the roller portion 18.
As shown in fig. 2, the position (height) in the up-down direction of the axial center O2 of the guide roller 13 is the same as the position (height) in the up-down direction of the axial center O1 of the cooling roller 12. That is, the axial center O1 of the cooling roller 12 and the axial center O2 of the guide roller 13 are located on the same horizontal line HL.
As shown in fig. 1 to 3, the temperature-increasing region 4 includes temperature-increasing heaters 4a and 4b disposed on the second main surface GRb side (facing the second main surface GRb) of the glass ribbon GR conveyed downward. The temperature raising heaters 4a and 4b are constituted by SIC heaters, for example, but are not limited thereto, and may be constituted by resistance heaters, induction heaters, or other various heaters. In the present embodiment, the temperature-raising heaters 4a and 4b are exemplified as rod-shaped temperature-raising heaters, but panel-shaped temperature-raising heaters of other shapes may be suitably used.
The temperature-increasing heaters 4a and 4b are disposed below the cooling roller 12. The temperature-increasing heaters 4a and 4b have lengths extending in the width direction X of the glass ribbon GR. The length of the heating heaters 4a and 4b is preferably larger than the width of the glass ribbon GR. As a result, the temperature-increasing heaters 4a and 4b can heat the glass ribbon GR over the entire width, that is, can uniformly heat the end portions GRc and the central portion GRd. The temperature-raising heaters 4a and 4b may be divided in the width direction, or the temperature-raising heaters 4a and 4b having a length shorter than the width of the glass ribbon GR may be arranged in the width direction so that the length of the entire temperature-raising heaters 4a and 4b is larger than the width of the glass ribbon GR.
In the present embodiment, two temperature raising heaters 4a and 4b are illustrated as being arranged in the vertical direction, but the number of temperature raising heaters is not limited to the present embodiment, and may be one or three or more.
The temperature-raising heaters 4a, 4b include an upper temperature-raising heater 4a located on the upper side and a lower temperature-raising heater 4b located on the lower side. The upper heating heaters 4a and the lower heating heaters 4b are arranged at intervals along the vertical direction which is the longitudinal direction (conveying direction) of the glass ribbon GR. The distance D2 between the upper temperature-increasing heater 4a and the cooling roller 12 in the vertical direction is, for example, 20 to 150mm.
As shown in fig. 1 and 2, the annealing zone 5 includes a plurality of upper and lower conveyance rollers 24 for conveying the glass ribbon GR downward. The conveying roller 24 is disposed below the temperature raising heaters 4a and 4b. The conveying rollers 24 of the upper and lower stages are formed of a pair of rollers that sandwich the end portions GRc of the glass ribbon GR in the width direction X between the first main surface GRa side and the second main surface GRb side.
Each conveying roller 24 has a roller portion 25 and a shaft portion 26. The roller portion 25 is made of, for example, ceramic. The roller portion 25 has a surface (contact surface) that contacts the end GRc of the glass ribbon GR in the width direction X. The shaft portion 26 is rotationally driven by a driving device not shown.
In addition to the above, the annealing zone 5 further includes a heater (not shown) disposed along the conveyance path of the glass ribbon GR. In the annealing zone 5, a predetermined temperature gradient is formed in the conveyance path of the glass ribbon GR by the heater.
Hereinafter, a method for manufacturing a glass article using the manufacturing apparatus 1 having the above-described structure will be described.
The method mainly comprises the following steps: a forming step of forming a glass ribbon GR from a molten glass GM by an overflow downdraw method; a cooling step of bringing the glass ribbon GR into contact with the roller portion 14 of the cooling roller 12; a temperature raising step of raising the temperature of the glass ribbon GR after the cooling step; and an annealing step of annealing the glass ribbon GR after the temperature increasing step.
In the molding step, in the molding region 2, the molten glass GM is overflowed from the overflow 6a of the molded body 6, and flows down through both side surfaces 7 of the molded body 6 to be formed into a plate shape. The glass ribbon GR is formed by fusing the plate-shaped molten glass GM to the lower end 11 of the forming body 6. The forming body 6 can form a glass ribbon GR having a constant width by restricting the end of the molten glass GM by the guide 8. The temperature of the glass ribbon GR before being separated from the lower end 11 and brought into contact with the cooling roll 12 is, for example, 1000 to 1450 ℃. In this case, the viscosity of the glass ribbon GR was 10 2.0 ～10 5.5 dPa.s. In the case where the glass ribbon GR is composed of a molten glass having a low liquid phase viscosity, the viscosity is 10 2.0 ～10 4.5 dPa.s. In the case where the glass ribbon GR is composed of a high-viscosity molten glassThe viscosity is, for example, 10 2.0 ～10 5.5 dPa.s, preferably 10 4.5 ～10 5.5 dPa·s。
The liquid phase viscosity of the molten glass GM is preferably 10 2 dPa.s or more and 10 4.5 dPa.s or less. Here, "liquid phase viscosity" refers to the viscosity of glass at a liquid phase temperature and can be measured by a platinum ball pulling method. In addition, the viscosity of the molten glass GM at 1000℃can be set to 10 4.5 dPa.s or more, preferably 10 7.0 dPa.s or more. On the other hand, the upper limit of the viscosity of the molten glass GM at 1000℃is preferably 10 from the viewpoint of preventing the occurrence of cracks 7.6 dPa.s or less.
In the cooling step, the second main surface GRb of the glass ribbon GR separated from the lower end 11 of the forming body 6 is brought into contact with the roller portion 14 of the cooling roller 12 of the cooling zone 3. At this time, the first cooling portion 16 of the roller portion 14 of the cooling roller 12 is in contact with the end portion GRc of the glass ribbon GR, and the second cooling portion 17 of the roller portion 14 of the cooling roller 12 is in contact with the central portion GRd of the glass ribbon GR. The second main surface GRb of the glass ribbon GR is brought into contact with the cooling roll 12 to a temperature of 650 to 1000 ℃. In this case, the temperature of the second main surface GRb of the glass ribbon GR is lower than the temperature of the first main surface GRa by contact with the cooling roller 12, and the temperature difference is 150 to 450 ℃. In addition, the viscosity of the second main surface GRb of the glass ribbon GR becomes, for example, 10 by the cooling step 7.0 ～10 9.9 dPa.s, preferably 10 7.6 ～10 9.9 dPa·s。
In the cooling step, the guide roller 13 contacts the end GRc of the glass ribbon GR from the first main surface GRa side. Thereby, the end GRc of the glass ribbon GR is sandwiched between the first cooling portion 16 of the cooling roller 12 and the guide roller 13. The cooling roller 12 and the guide roller 13 guide the glass ribbon GR vertically downward while rotating.
Thereafter, in the temperature increasing step, the glass ribbon GR passes through the temperature increasing area 4 while moving downward. The temperature-increasing heaters 4a and 4b heat the glass ribbon GR from the second main surface GRb side. In this case, the temperature of the second main surface GRb of the glass ribbon GR is desirably increased to a softening point or higher. This can remove warpage generated by the difference between the temperature of the first main surface GRa and the temperature of the second main surface GRb in the cooling step.
In the subsequent annealing step, the glass ribbon GR is conveyed by the conveyance roller 24 to pass through the annealing zone 5 (conveyance step). In the conveying step, the glass ribbon GR fed vertically downward from the cooling roll 12 is conveyed vertically downward by the conveying roll 24. The position of the conveyance roller 24 in the horizontal direction is not limited to this, and the glass ribbon GR may be conveyed obliquely to the vertical direction by changing the position.
After that, various steps such as a cutting step can be performed. For example, in the cutting step, the middle portion of the glass ribbon GR is cut along the width direction X, thereby obtaining a rectangular glass plate. After that, for example, after a portion corresponding to the end GRc of the glass ribbon GR is cut off from the glass plate, the glass plate as a glass article is manufactured through quality inspection of the surface of the glass plate (inspection step), grinding and polishing of the end of the glass plate (grinding and polishing step), and cleaning of the surface of the glass plate (cleaning step).
In addition to the above steps, the method may include a winding step of cutting off the end portions GRc and winding the glass ribbon GR consisting only of the central portion GRd in a roll shape. Thereby, a glass roll as a glass article is produced.
According to the method of manufacturing a glass article of the present embodiment described above, in the cooling step, the glass ribbon GR is cooled by being in contact with the roller portion 14 of the cooling roller 12 through the second main surface GRb. In this case, a temperature difference occurs between the second main surface GRb side and the first main surface GRa side of the glass ribbon GR, and as a result, the glass ribbon GR warps. In the temperature increasing step, the glass ribbon GR is heated by the temperature increasing heaters 4a and 4b to increase the temperature, so that warpage of the glass ribbon GR can be alleviated.
In addition, the temperature difference generated in the glass ribbon GR in the cooling step causes residual stress in the glass ribbon GR in the subsequent annealing, and also causes cutting failure in the cutting step. When the temperature-increasing heaters 4a and 4b heat the glass ribbon GR from the second main surface GRb side in the temperature-increasing step, the second main surface GRb side is effectively heated, and therefore, the temperature difference can be reduced. Therefore, residual stress generated in the glass ribbon GR during annealing is reduced, and defective cutting of the glass ribbon GR can also be prevented.
In the cooling step, the end portion GRc of the glass ribbon GR is sandwiched between the first cooling portion 16 of the roller portion 14 of the cooling roller 12 and the roller portion 18 of the guide roller 13, so that shrinkage of the glass ribbon GR in the cooling step can be suppressed. In addition, the slip of the glass ribbon GR with respect to the cooling roll 12 can also be suppressed.
Fig. 5 and 6 show a second embodiment of the present invention. The manufacturing apparatus 1 of the present embodiment includes a first cooling region 3a, a temperature raising region 4, a second cooling region 3b, and an annealing region 5. The structure of the first cooling region 3a is the same as the cooling region 3 in the first embodiment. The structures of the temperature raising region 4 and the annealing region 5 are the same as those of the first embodiment. Common reference numerals are given to constituent elements common to the first embodiment in the present embodiment.
The second cooling region 3b is provided between the temperature raising region 4 and the annealing region 5. The second cooling region 3b includes edge rollers 27 for holding a pair of edge portions (edges) GRe included in the end portions GRc of the glass ribbon GR in the width direction X. Each edge roll 27 comprises two rolls that grip the glass ribbon GR.
Each edge roller 27 includes a roller portion 28 and a shaft portion 29. The roller portion 28 is made of metal, for example. The shaft portion 29 is rotationally driven by a drive source such as a motor. The edge rollers 27 each have a cooling mechanism (not shown) inside the same as the guide roller 13 of the first embodiment. The edge roller 27 is configured to be movable in the axial direction thereof.
The method for manufacturing a glass article according to the present embodiment includes an end cooling step performed after the temperature increasing step. In the end cooling step, the edge roller 27 of the second cooling region 3b clamps the edge portion GRe of the glass ribbon GR passing through the temperature increasing region 4, thereby cooling the end portion GRc (including the edge portion GRe) of the glass ribbon GR in the width direction X. Thus, the temperature of the end GRc of the glass ribbon GR is, for example, 1050 ℃ or lower, preferably 1000 ℃ or lower. The lower limit of the temperature of the end GRc of the glass ribbon GR is, for example, 650 ℃ or higher, preferably 800 ℃ or higher. In addition, the viscosity of the end GRc of the glass ribbon GR becomes 10, for example 13.0 dPa.s or less, preferably10 9.9 dPa.s or less. The lower limit of the viscosity of the end GRc of the glass ribbon GR is, for example, 10 7.6 dPa.s or more, preferably 10 8.0 dPa.s or more.
By including the end cooling step, the glass ribbon GR can be made to have a constant width while suppressing shrinkage of the glass ribbon GR in the width direction X during annealing. Further, by performing the temperature increasing step before the end cooling step, the time required for increasing the temperature to a temperature at which warpage can be alleviated can be shortened, and the glass ribbon GR can be efficiently produced.
In the present method, after the end portion cooling step, each step such as an annealing step is performed. Other structures in this embodiment are the same as those in the first embodiment.
Fig. 7 shows a third embodiment of the present invention. In the present embodiment, the structure of the molded body 6 and the molding step is different from the first embodiment. The forming body 6 includes one side surface 7 for guiding the molten glass GM flowing out of the overflow groove 6a downward, and a guide portion 8 for guiding (restricting) the end portion of the molten glass GM in the width direction downward. Common reference numerals are given to constituent elements common to the first embodiment in the present embodiment.
The side surface 7 of the molded body 6 is constituted only by the vertical surface portion 9 extending in the vertical direction, but the shape of the side surface 7 is not limited to this embodiment. The side surface 7 may be a surface inclined with respect to the vertical direction, or may be a surface formed by combining the vertical surface 9 and the inclined surface.
In the present embodiment, in the molding step, the glass ribbon GR can be molded from the molten glass GM by only one side surface 7, instead of fusing the molten glass GM to the lower end 11 of the molded body 6 by the pair of side surfaces 7 as in the first embodiment. The glass ribbon GR has a first main surface GRa and a second main surface GRb formed by the molten glass GM contacting the side surface 7. In the cooling step, the cooling roller 12 contacts the end GRc of the glass ribbon GR from the second main surface GRb side.
Other structures in this embodiment are the same as those in the first embodiment.
Fig. 8 shows a fourth embodiment of the present invention. The molded body 6 of the manufacturing apparatus 1 of the present embodiment has two side surfaces 7, but each side surface 7 is constituted only by a vertical surface portion 9. The lower ends 11 of the two vertical faces 9 are not connected, and each side 7 can independently form one glass ribbon GR1, GR2. That is, in the method for producing a glass article according to the present embodiment, in the molding step, the plate-shaped molten glass GM flowing on one side surface 7 and the plate-shaped molten glass GM flowing on the other side surface 7 are not fused at the respective lower end portions 11 of the molded body 6.
Hereinafter, the glass ribbon formed by one side surface 7 of the two side surfaces 7 is referred to as a first glass ribbon GR1, and the glass ribbon formed by the other side surface 7 is referred to as a second glass ribbon GR2.
The cooling zone 3 includes a first cooling roller 12a and a first guide roller 13a that are in contact with the first glass ribbon GR1, and a second cooling roller 12b and a second guide roller 13b that are in contact with the second glass ribbon GR2. The cooling rolls 12a and 12b have the same structure as the cooling roll 12 of the first embodiment. The guide rollers 13a and 13b have the same structure as the guide roller 13 of the first embodiment.
The temperature raising region 4 includes first temperature raising heaters 4a1 and 4b1 for raising the temperature of the first glass ribbon GR1 cooled by the first cooling roller 12a, and second temperature raising heaters 4a2 and 4b2 for raising the temperature of the second glass ribbon GR2 cooled by the second cooling roller 12 b. The temperature increase heaters 4a1, 4b1, 4a2, and 4b2 have the same configuration as the temperature increase heaters 4a and 4b in the first embodiment.
The first temperature-increasing heaters 4a1 and 4b1 are disposed on the second main surface GRb side of the first glass ribbon GR1 conveyed downward. The second temperature-increasing heaters 4a2 and 4b2 are disposed on the second main surface GRb side of the second glass ribbon GR2 conveyed downward.
The annealing zone 5 includes a first conveyance roller 24a for conveying the first glass ribbon GR1 and a second conveyance roller 24b for conveying the second glass ribbon GR2. The conveying rollers 24a and 24b have the same structure as the conveying roller 24 of the first embodiment.
In the method for producing a glass article according to the present embodiment, in the forming step, the molten glass GM overflowed from the overflow trough 6a is caused to flow down along both side surfaces 7, whereby two glass ribbons GR1 and GR2 are formed simultaneously.
In the subsequent cooling step, the cooling of the first glass ribbon GR1 and the second glass ribbon GR2 by the cooling rolls 12a and 12b and the guiding rolls 13a and 13b is simultaneously progressed.
In the temperature increasing step after the cooling step, the first glass ribbon GR1 having passed through the cooling area 3 is heated by the first temperature increasing heaters 4a1 and 4b1, and the temperature of the first glass ribbon GR1 is increased. At the same time, the second glass ribbon GR2 having passed through the cooling area 3 is heated by the second temperature increasing heaters 4a2, 4b2, and the temperature of the second glass ribbon GR2 is increased.
In the subsequent annealing step (conveying step), the glass ribbons GR1 and GR2 are conveyed by the conveying rollers 24a and 24b while advancing.
Other structures in this embodiment are the same as those in the first embodiment. Common reference numerals are given to constituent elements common to the first embodiment in the present embodiment.
The present invention is not limited to the configuration of the above embodiment, and is not limited to the above-described operational effects. The present invention can be variously modified within a scope not departing from the gist of the present invention.
In the above-described embodiment, the example in which the glass ribbon GR is heated by the temperature increase heaters 4a and 4b disposed on the second main surface GRb side of the glass ribbon GR in the temperature increase step is shown, but the present invention is not limited to this embodiment. In the temperature increasing step, temperature increasing heaters may be disposed on both sides of the first main surface GRa side and the second main surface GRb side of the glass ribbon GR. In this case, from the viewpoint of reducing the temperature difference between the second main surface side and the first main surface side of the glass ribbon, the amount of heat applied to the glass ribbon GR by the temperature increase heater disposed on the second main surface GRb side is preferably larger than the amount of heat applied to the glass ribbon GR by the temperature increase heater disposed on the first main surface GRa side.
In the above embodiment, the guide roller 13 is used, but the guide roller 13 may be omitted. In the above-described embodiment, the example in which the grooves 21 are formed in the guide roller 13 has been described, but the present invention is not limited to this, and the grooves 21 may be formed in rollers other than the guide roller 13 described in the above-described embodiment, for example, grooves may be formed in the edge roller 27. In addition, the roller may be provided with irregularities instead of grooves.
In the above embodiment, the glass ribbon GR is formed from the molten glass GM by the overflow downdraw method, but the glass ribbon GR may be formed from the molten glass GM by the slot downdraw method.
Description of the reference numerals
1 apparatus for producing glass article
4a heating heater
4b lower heating heater
4a1 first heating heater
4b1 first heating heater
4a2 second heating heater
4b2 second heating heater
6 shaped body
12 cooling roller
12a first chill roll
12b second chill roll
13 guide roller
13a first guide roller
13b second guide roller
14 roller portion of chill roll
18 guide roller section
24 carrying roller
24a first carrying roller
24b second carrying roller
27 edge roller
GM molten glass
GR glass ribbon
GR1 first glass ribbon
GR2 second glass ribbon
GRa first major face
GRb second major face
GRc ends of the glass ribbon in the width direction
GRd widthwise center portion of the glass ribbon
The width direction of the X glass ribbon.
Claims (9)
1. A method of manufacturing a glass article, comprising: a forming step of forming a glass ribbon from the molten glass by a down-draw method; and a cooling step of bringing the glass ribbon into contact with a roller portion of a cooling roller,
the method for manufacturing a glass article is characterized in that,
the glass ribbon includes widthwise end portions and widthwise center portions,
the glass ribbon includes: a first main surface which is not in contact with the roller portion of the cooling roller; and a second main surface which is in contact with the roller portion of the cooling roller,
in the cooling step, the end portions in the width direction and the center portion in the width direction of the glass ribbon are brought into contact with the roller portions of the cooling rollers via the second main surface,
the method for manufacturing a glass article includes a temperature increasing step of increasing the temperature of the glass ribbon by heating the glass ribbon after the cooling step.
2. The method for producing a glass article according to claim 1, wherein,
in the temperature increasing step, the glass ribbon is heated by a temperature increasing heater disposed on the second main surface side.
3. The method for producing a glass article according to claim 2, wherein,
the warming heater has a length extending in the width direction of the glass ribbon.
4. The method for producing a glass article according to claim 2 or 3, wherein,
the heating heaters include a plurality of heating heaters disposed along a length of the glass ribbon.
5. The method for producing a glass article according to any of claims 1 to 3, wherein,
the method for producing a glass article includes an end cooling step of cooling the end portion of the glass ribbon in the width direction while sandwiching the end portion with edge rollers after the temperature increasing step.
6. The method for producing a glass article according to any of claims 1 to 3, wherein,
in the cooling step, the end portion of the glass ribbon in the width direction is sandwiched between the roller portion of the cooling roller and the roller portion of the guide roller.
7. The method for producing a glass article according to any of claims 1 to 3, wherein,
the liquid phase viscosity of the molten glass was 10 4.5 dPa.s or less.
8. The method for producing a glass article according to any of claims 1 to 3, wherein,
the viscosity of the molten glass at 1000 ℃ is 10 7.0 dPa.s or more.
9. An apparatus for manufacturing a glass article, comprising: forming a glass ribbon from the molten glass by a downdraw process; and a cooling roller that cools the glass ribbon,
the apparatus for manufacturing glass articles is characterized in that,
the glass ribbon includes widthwise end portions and widthwise center portions,
the cooling roller is provided with a roller part which is contacted with the end part in the width direction and the central part in the width direction of the glass ribbon,
the glass ribbon includes: a first main surface which is not in contact with the roller portion of the cooling roller; and a second main surface which is in contact with the roller portion of the cooling roller,
the apparatus for manufacturing glass articles includes a temperature-increasing heater that heats the glass ribbon after bringing the end portions in the width direction and the central portion in the width direction of the glass ribbon into contact with the roller portions of the cooling rollers via the second main surface.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-132829 | 2021-08-17 | ||
| JP2021132829 | 2021-08-17 | ||
| PCT/JP2022/030323 WO2023022052A1 (en) | 2021-08-17 | 2022-08-08 | Glass article manufacturing method and manufacturing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117561224A true CN117561224A (en) | 2024-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280045248.2A Pending CN117561224A (en) | 2021-08-17 | 2022-08-08 | Method and apparatus for manufacturing glass article |
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| Country | Link |
|---|---|
| JP (1) | JPWO2023022052A1 (en) |
| CN (1) | CN117561224A (en) |
| WO (1) | WO2023022052A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2065345A1 (en) * | 2007-11-29 | 2009-06-03 | Corning Incorporated | Apparatus and method for producing sheets of glass presenting at least one face of very high surface quality |
| EP2301898A1 (en) * | 2009-09-29 | 2011-03-30 | Corning Incorporated | Glass texturing using a porous textured roll under vacuum |
| WO2012133842A1 (en) * | 2011-03-31 | 2012-10-04 | ＡｖａｎＳｔｒａｔｅ株式会社 | Method for manufacturing glass substrate and apparatus for manufacturing glass substrate |
| JP5555373B2 (en) * | 2011-09-30 | 2014-07-23 | ＡｖａｎＳｔｒａｔｅ株式会社 | Manufacturing method of glass substrate for flat panel display |
| 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 |
| US10209419B2 (en) * | 2013-09-17 | 2019-02-19 | Corning Incorporated | Broadband polarizer made using ion exchangeable fusion drawn glass sheets |
| TWI774655B (en) * | 2016-02-22 | 2022-08-21 | 美商康寧公司 | Alkali-free boroalumino silicate glasses |
| CN115259660B (en) * | 2017-04-27 | 2024-10-29 | 日本电气硝子株式会社 | Glass substrate |
| CN111278778B (en) * | 2017-10-27 | 2023-01-20 | 肖特股份有限公司 | Device and method for producing sheet glass |
| JP2020132461A (en) * | 2019-02-18 | 2020-08-31 | 日本電気硝子株式会社 | Glass sheet manufacturing method |
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2022
- 2022-08-08 WO PCT/JP2022/030323 patent/WO2023022052A1/en active Application Filing
- 2022-08-08 CN CN202280045248.2A patent/CN117561224A/en active Pending
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| WO2023022052A1 (en) | 2023-02-23 |
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