KR20100103423A - Method and apparatus for producing glass sheet - Google Patents
Method and apparatus for producing glass sheet Download PDFInfo
- Publication number
- KR20100103423A KR20100103423A KR1020100022327A KR20100022327A KR20100103423A KR 20100103423 A KR20100103423 A KR 20100103423A KR 1020100022327 A KR1020100022327 A KR 1020100022327A KR 20100022327 A KR20100022327 A KR 20100022327A KR 20100103423 A KR20100103423 A KR 20100103423A
- Authority
- KR
- South Korea
- Prior art keywords
- glass plate
- glass
- forming apparatus
- plate forming
- glass ribbon
- Prior art date
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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
- C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/14—Changing the surface of the glass ribbon, e.g. roughening
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/10—Annealing glass products in a continuous way with vertical displacement of the glass products
- C03B25/12—Annealing glass products in a continuous way with vertical displacement of the glass products of glass sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Glass Compositions (AREA)
- Cell Separators (AREA)
Abstract
Description
This invention relates to the manufacturing method and manufacturing apparatus of a glass plate. TECHNICAL FIELD This invention relates especially to the technique of manufacturing a glass plate by the downdraw method.
With the down-draw method, molten glass which overflowed from the groove | channel of the upper part of a wedge-shaped glass plate forming apparatus flows down along the side wall of a glass plate forming apparatus, fuses in the lower end (root) of a glass plate forming apparatus, and continuously shapes a glass ribbon. It is a way. The glass ribbon is gradually cooled by advancing into the furnace while being supported by a roll disposed below the glass plate forming apparatus, and cut to obtain a glass plate of a desired size.
The downdraw method is suitable for producing large and thin glass plates, for example, glass substrates for flat panel displays. For example, Japanese Patent Laid-Open No. 2008-133174 discloses a technique for stably producing an ultra-thin glass plate (for example, 0.5 mm or less). Specifically, after reducing the thickness of the glass ribbon to the initial thickness directly under the molded body (glass plate forming apparatus), the glass ribbon is heated at a temperature equal to or higher than the softening point by reheating means (heater) disposed below the restricting means (cooling roller). Heat to soften and extend the softened glass ribbon downwards to make the plate thickness even thinner.
Moreover, in order to shape | mold the high quality glass ribbon, temperature control of the width direction of the molten glass in the side wall of a glass plate forming apparatus is important. For example, Japanese Unexamined Patent Application Publication No. 2007-112665 discloses a heater that is densely present in the arrangement of the heating elements at a position facing the side wall of the molded body (glass plate forming apparatus), whereby the temperature in the width direction of the molten glass. Techniques for homogenizing the distribution are described. Japanese Laid-Open Patent Publication No. 2008-69024 discloses a technique of uniformizing the temperature distribution in the width direction of the molten glass by energizing a platinum film on the surface of a fusion cell (glass plate forming apparatus).
By the way, the edge part of the glass ribbon shape | molded by the down-draw method has the form normally shown in FIG. However, it is not limited that the edge part of a glass ribbon always does this form, and may have the form divided into two branches. The edge part which has a bifurcated shape makes a cutting process of a glass ribbon difficult, or may cause a crack of a glass ribbon. Moreover, the edge part which has a bifurcated shape may be the cause, a nonuniformity arises in the thickness of a center part (part used as a product), and a yield may fall.
An object of the present invention is to prevent a shape defect of an end portion of a glass ribbon.
The present inventors investigated the cause of the shape defect of the edge part of a glass ribbon in detail. As a result, attention was paid to the fact that the viscosity of the glass ribbon immediately after the fusion is the main factor that determines the final shape of the end of the glass ribbon, thus completing the present invention.
That is, this invention fuse | melts molten glass in the lower end of a glass plate shaping | molding apparatus, shape | molds a glass ribbon, and conveys the said glass ribbon downward along the some roll arrange | positioned under the said glass plate shaping | molding apparatus, The glass plate by the down-draw method A manufacturing method of the above, wherein a heater is provided in a space between a lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus, and the end of the glass ribbon immediately after the fusion is locally heated by the heater. The manufacturing method of the glass plate which shape | molds and conveys a glass ribbon is provided.
In another aspect, the present invention provides a glass plate forming apparatus having a wedge-shaped cross section, and a molten glass disposed below the glass plate forming apparatus and overflowing from a groove in an upper portion of the glass plate forming apparatus at a lower end of the glass plate forming apparatus. The lower end of the said glass plate shaping | molding apparatus and the said glass plate so that the some roll which conveys the glass ribbon shape | molded by fuse | melting by the lower side of the said glass plate forming apparatus, and the edge part of the width direction of the said glass ribbon immediately after fusion can be locally heated. The manufacturing apparatus of the glass plate provided with the heater provided in the space between the said rolls located nearest to the shaping | molding apparatus is provided.
The glass ribbon immediately after the fusion is not completely solidified and is easily affected by the ambient temperature because it is in a viscous fluid state. Usually, the edge part of a glass ribbon cools faster than the center part of a glass ribbon. If the temperature decrease of an edge part is too fast compared with the temperature decrease of a center part, the viscosity nonuniformity will become large about the width direction, and the shape defect of an edge part will generate | occur | produce easily.
In contrast, according to the present invention, the end portion of the glass ribbon immediately after the fusion is locally heated by a heater. That is, only the edge part of a glass ribbon is prevented from being cooled rapidly immediately after peeling from a glass plate shaping | molding apparatus. Thereby, the temperature distribution of the width direction of a glass ribbon, ie, a viscosity distribution, becomes uniform, and the shape defect of an edge part hardly arises. Since the present invention can be used to implement the present invention, the present invention is also excellent in cost.
In order to acquire the same effect as this invention, it is also considered to raise the atmospheric temperature in a furnace near the lower end of a glass plate shaping | molding apparatus. In this way, the same effects as those of the present invention may be obtained. However, the present invention is quite advantageous in terms of power consumption because it is sufficient to locally heat the ends of the glass ribbon. In addition, when the atmosphere inside the furnace is set to a high temperature, deterioration of various components proceeds quickly and the device life is shortened, which is not preferable.
In addition, the "end of a glass ribbon" refers to the area | region from the side surface of the glass ribbon to the position which advanced about 50 mm inside, for example.
BRIEF DESCRIPTION OF THE DRAWINGS The schematic front view of the manufacturing apparatus of the glass plate which concerns on one Embodiment of this invention.
2 is a schematic longitudinal cross-sectional view along the line II-II of the apparatus for manufacturing a glass plate shown in FIG. 1.
3 is a partially enlarged view showing a detailed position of a heater.
4 is a schematic diagram showing the dimensional relationship between a guide and a heater
5 is a schematic diagram showing a modification of the heater.
6 is a schematic diagram showing the positional relationship between a glass ribbon and a roll
7 is a cross-sectional view showing a shape of an end of a glass ribbon.
Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.
As shown to FIG. 1 and FIG. 2, the
The
The glass
As shown in FIG. 2, the glass plate shaping |
The
As shown in FIG. 1, the
As is well known, loss of transparency is a phenomenon in which crystal grains are formed in the glass and the transparency of the glass is lowered. When manufacturing a glass plate by the down-draw method, a loss of transparency is easy to generate | occur | produce in the edge part of the
When the
In the present embodiment, the
As shown in FIG. 3, the width of the
As shown in FIG. 2, the
The energization (setting temperature) of the
Moreover, as shown in FIG. 4, the
In addition, based on the detection result of the
The
According to this embodiment, since the edge part of the
For example, as shown in FIG. 2 of Unexamined-Japanese-Patent No. 2008-133174, it is also possible to position these rolls so that all the rolls may not pinch the edge of a glass ribbon. When the viscosity of an edge part is high, it is wise to avoid pinching an edge part with a roll from a viewpoint of carrying out stable conveyance, or preventing a crack of a glass ribbon.
On the other hand, according to this embodiment, since the raise of the viscosity of the
The operation of the
According to this embodiment, since the
The viscosity of the molten glass in the
In particular, the demand for large-area glass plates has increased recently. For example, the dimension of the 10th generation glass substrate for liquid crystal displays is 2850 mm x 3050 mm. The wider the width of the glass ribbon, the more easily the nonuniformity of the viscosity in the width direction occurs, so that the effect obtained by applying the present invention also increases. Moreover, the typical glass composition of the glass substrate for flat panel displays is shown below.
SiO 2 : 57-70 mass%
Al 2 O 3 : 13-19 mass%
B 2 O 3 : 8 to 13 mass%
MgO: 0-2 mass%
CaO: 4-6 mass%
SrO: 2-4 mass%
BaO: 0-2 mass%
Na 2 O: 0-1 mass%
K 2 O: 0-1 mass%
As 2 O 3 : 0-1 mass%
Sb 2 O 3 : 0-1 mass%
SnO 2 : 0-1 mass%
Fe 2 O 3 : 0-1 mass%
ZrO 2 : 0-1 mass%
<Examples>
Using a continuous dissolution apparatus equipped with a dissolution tank made of refractory brick and an adjustment tank made of platinum (a tank for performing a clarification process), the glass raw materials combined to have the following composition were dissolved at 1550 ° C, clarified at 1600 ° C, and 1550. It stirred at C and obtained molten glass. In addition, it is because the error by rounding contains the total mass over 100%.
SiO 2 : 60.9 mass%
Al 2 O 3 : 16.9 mass%
B 2 O 3 : 11.6 mass%
MgO: 1.7 mass%
CaO: 5.1 mass%
SrO: 2.6 mass%
BaO: 0.7 mass%
K 2 O: 0.25 mass%
Fe 2 O 3 : 0.15 mass%
SnO 2 : 0.13 mass%
Next, molten glass was supplied to the
The molten glass was continuously supplied, the molten glass was overflowed from the glass
Claims (10)
By installing a heater in the space between the lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus,
The manufacturing method of the glass plate which shape | molds and conveys the said glass ribbon, heating locally the edge part of the said glass ribbon immediately after a fusion | fever with the said heater.
A plurality of rolls which are disposed below the glass plate forming apparatus and convey the glass ribbon formed by melting the molten glass overflowed from the grooves in the upper portion of the glass plate forming apparatus at the lower end of the glass plate forming apparatus below the glass plate forming apparatus. and,
A heater provided in the space between the lower end of the glass plate forming apparatus and the roll located closest to the glass plate forming apparatus so as to locally heat the end portion in the width direction of the glass ribbon immediately after the fusion.
The manufacturing apparatus of the glass plate provided with.
A controller for controlling energization of the heater based on a detection result of the temperature sensor
The manufacturing apparatus of the glass plate further provided.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009061290A JP5005717B2 (en) | 2009-03-13 | 2009-03-13 | Glass plate manufacturing method and manufacturing apparatus |
JPJP-P-2009-061290 | 2009-03-13 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20100103423A true KR20100103423A (en) | 2010-09-27 |
KR101740730B1 KR101740730B1 (en) | 2017-05-26 |
Family
ID=42974688
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020100022327A KR101740730B1 (en) | 2009-03-13 | 2010-03-12 | Method and apparatus for producing glass sheet |
Country Status (4)
Country | Link |
---|---|
JP (1) | JP5005717B2 (en) |
KR (1) | KR101740730B1 (en) |
SG (1) | SG165248A1 (en) |
TW (1) | TWI458689B (en) |
Cited By (2)
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KR20150113864A (en) * | 2014-03-31 | 2015-10-08 | 아반스트레이트 가부시키가이샤 | Method and apparatus for making glass sheet |
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-
2009
- 2009-03-13 JP JP2009061290A patent/JP5005717B2/en active Active
-
2010
- 2010-03-05 TW TW099106400A patent/TWI458689B/en active
- 2010-03-09 SG SG201001646-7A patent/SG165248A1/en unknown
- 2010-03-12 KR KR1020100022327A patent/KR101740730B1/en active IP Right Grant
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103359913A (en) * | 2012-04-06 | 2013-10-23 | 安瀚视特控股株式会社 | Making method of glass substrate |
CN103359913B (en) * | 2012-04-06 | 2016-06-15 | 安瀚视特控股株式会社 | The manufacture method of glass substrate |
KR20150113864A (en) * | 2014-03-31 | 2015-10-08 | 아반스트레이트 가부시키가이샤 | Method and apparatus for making glass sheet |
Also Published As
Publication number | Publication date |
---|---|
JP5005717B2 (en) | 2012-08-22 |
TWI458689B (en) | 2014-11-01 |
SG165248A1 (en) | 2010-10-28 |
JP2010215428A (en) | 2010-09-30 |
KR101740730B1 (en) | 2017-05-26 |
TW201036923A (en) | 2010-10-16 |
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