KR101740730B1 - Method and apparatus for producing glass sheet - Google Patents

Method and apparatus for producing glass sheet Download PDF

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KR101740730B1
KR101740730B1 KR1020100022327A KR20100022327A KR101740730B1 KR 101740730 B1 KR101740730 B1 KR 101740730B1 KR 1020100022327 A KR1020100022327 A KR 1020100022327A KR 20100022327 A KR20100022327 A KR 20100022327A KR 101740730 B1 KR101740730 B1 KR 101740730B1
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South Korea
Prior art keywords
glass
forming apparatus
heater
ribbon
glass plate
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KR1020100022327A
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Korean (ko)
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KR20100103423A (en
Inventor
키미히코 나카지마
카츠히코 모리사다
히로유키 카리야
Original Assignee
아반스트레이트 가부시키가이샤
아반스트레이트 타이완 인크
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
    • 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

The present invention is characterized in that the molten glass is fused at the lower end 4e of the glass sheet forming apparatus 4 to form a glass ribbon and the glass ribbon 9 is conveyed along a plurality of rollers 6 disposed below the glass sheet forming apparatus 4. [ The glass plate is manufactured by a down-draw method in which the glass plate is conveyed downward. The heater 8 is provided in the space between the lower end 4e of the glass sheet forming apparatus 4 and the roller 6a positioned closest to the glass sheet forming apparatus 4 and the end of the glass ribbon 9 immediately after fusion The glass ribbon 9 is molded and conveyed while being locally heated by the heater 8. [

Description

Technical Field [0001] The present invention relates to a method of manufacturing a glass plate,

The present invention relates to a manufacturing method and a manufacturing apparatus for a glass plate. TECHNICAL FIELD The present invention relates to a technique for manufacturing a glass plate by a down-draw method in particular.

The down-draw method is a method in which a molten glass that flows over a groove on the upper side of a wedge-shaped glass sheet forming apparatus is flowed downward along the side wall of the glass sheet forming apparatus and fused at the lower end (root) Method. The glass ribbon is gradually cooled in the furnace while being supported by a roll disposed under the glass plate forming apparatus, and is cut so as to obtain a glass plate of a desired size.

The down-draw method is suitable for the production of flat and thin glass substrates, for example, glass substrates for flat panel displays. For example, Japanese Patent Application 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 the thickness of the glass ribbon is reduced to the initial thickness immediately below the formed body (glass plate forming apparatus), a reheating means (heater) disposed below the regulating means (cooling roller) And the softened glass ribbon is extended downward to further reduce the thickness of the plate.

Further, in order to form a high-quality glass ribbon, it is important to control the temperature in the width direction of the molten glass on the side wall of the glass plate forming apparatus. For example, Japanese Unexamined Patent Publication (Kokai) No. 2007-112665 discloses that a heater, which is densely present in the arrangement of heat generating elements, is provided at a position facing a side wall of a formed article (glass plate forming apparatus) A technique for making the distribution uniform is described. Japanese Patent Application Laid-Open No. 2008-69024 discloses a technique for uniformizing the temperature distribution in the width direction of the molten glass by energizing the platinum film on the surface of the fusion cell (glass plate forming apparatus).

Japanese Patent Application Laid-Open No. 2008-133174 Japanese Patent Application Laid-Open No. 2007-112665 Japanese Patent Application Laid-Open No. 2008-69024

Incidentally, the end portion of the glass ribbon formed by the down-draw method usually has a form shown in Fig. However, the end portion of the glass ribbon is not always limited to this shape, and may be divided into two parts. An end portion having a bifurcated shape may cause difficulty in cutting the glass ribbon or may cause cracks in the glass ribbon. In addition, due to the end portion having a bifurcated shape, the thickness of the central portion (product portion) may be uneven, and the yield may be lowered.

An object of the present invention is to prevent defective shape of the end portion of a glass ribbon.

The present inventors have investigated in detail the cause of defective shape of the end portion of the glass ribbon. As a result, the present inventors have completed the present invention by paying attention to the fact that the viscosity of the glass ribbon immediately after fusion is a main factor determining the final shape of the end portion of the glass ribbon.

That is, the present invention relates to a glass sheet forming apparatus for forming a glass ribbon by fusing a molten glass at the lower end of a glass sheet forming apparatus and for forming a glass sheet by a down-draw method in which the glass ribbon is conveyed downward along a plurality of rolls arranged below the glass sheet- A heater is provided in a space between the 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 fusion is locally heated with the heater, A method of manufacturing a glass plate for forming and transporting a glass ribbon.

According to another aspect of the present invention, there is provided a glass sheet forming apparatus comprising a glass sheet forming apparatus having a wedge-shaped cross section, and a glass sheet forming apparatus arranged below the glass sheet forming apparatus, A plurality of rolls for conveying the glass ribbon formed by fusing to the lower side of the glass plate forming apparatus and a plurality of rolls for feeding the lower end of the glass plate forming apparatus and the glass plate, And a heater provided in a space between the rolls positioned closest to the molding apparatus.

The glass ribbon immediately after the fusion is not completely solidified, but is in the state of viscous fluid and is therefore susceptible to ambient temperature. Normally, the end portion of the glass ribbon is cooled faster than the center portion of the glass ribbon. If the temperature drop at the end portion is too fast as compared with the temperature drop at the center portion, unevenness of the viscosity in the width direction becomes large, and the shape of the end portion is liable to be defective.

On the other hand, according to the present invention, the end portion of the glass ribbon immediately after fusion is locally heated with a heater. That is, only the end portion of the glass ribbon is prevented from being rapidly cooled immediately after being peeled from the glass sheet forming apparatus. As a result, the temperature distribution in the width direction of the glass ribbon, that is, the viscosity distribution becomes uniform, and the defective shape of the end portion becomes less likely to occur. The present invention can be carried out by utilizing an existing apparatus, so that the present invention is also excellent in cost.

In order to obtain the same effect as the present invention, it is also conceivable to raise the atmospheric temperature in the furnace in the vicinity of the lower end of the glass plate forming apparatus. In this way, the same effect as that of the present invention may be obtained. However, the present invention is advantageous in terms of power consumption because it is sufficient to locally heat the end portion of the glass ribbon. In addition, if the atmosphere in the furnace is set to a high temperature, deterioration of various parts rapidly progresses and the life of the device becomes short, which is not preferable.

The "end portion of the glass ribbon" refers, for example, to a region extending from the side surface of the glass ribbon by about 50 mm inward.

1 is a schematic front view of an apparatus for manufacturing a glass plate according to an embodiment of the present invention
2 is a schematic vertical sectional view along the line II-II of the apparatus for producing a glass plate shown in Fig. 1
3 is a partial enlarged view showing a detailed position of the heater
4 is a schematic view showing the dimensional relationship of the guide and the heater;
5 is a schematic view showing a modification example of the heater
6 is a schematic view showing a positional relationship between a glass ribbon and a roll;
[Fig. 7] A sectional view showing a shape of an end portion of a glass ribbon

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2, an apparatus 100 for manufacturing a glass sheet according to the present embodiment includes a furnace 2, a glass sheet forming apparatus 4 disposed at an upper portion of the furnace 2, A plurality of rolls 6 disposed below the glass plate forming apparatus 4 and a heater 8 arranged close to the lower end 4e of the glass plate forming apparatus 4 (route). According to this apparatus 100, a glass plate can be manufactured by a down-draw method in which a molten glass that has spilled over from a glass plate forming apparatus 4 is fused at a lower end 4e to form a glass ribbon 9. [

The furnace 2 is usually made of refractory bricks. On the inner wall of the furnace 2, a plurality of heaters 10 are arranged along the vertical direction. The heater 10 is suitable for heating in a relatively wide range in a long form extending parallel to the longitudinal direction of the glass plate forming apparatus 4. [ The temperature inside the furnace 2 can be controlled by controlling the heater 10. Specifically, a temperature gradient is formed along the vertical direction so that the glass ribbon 9 is gradually cooled when the inside of the furnace 2 is moved downward.

The glass sheet forming apparatus 4 is usually made of refractory bricks. As shown in Fig. 2, the glass sheet forming apparatus 4 shows a wedge shape in a cross section orthogonal to the longitudinal direction LD of the glass sheet forming apparatus 4. In Fig. The longitudinal direction LD of the glass sheet forming apparatus 4 coincides with the width direction of the glass ribbon 9. On the upper side of the glass sheet forming apparatus 4, grooves 4k for holding molten glass are formed so as to extend in the longitudinal direction LD. As shown in Fig. 1, a supply pipe 11 is connected to the groove 4k so that molten glass can be continuously supplied to the groove 4k from one side in the longitudinal direction LD.

As shown in Fig. 2, the glass sheet forming apparatus 4 has a pair of side walls 4j with respect to the directions orthogonal to both the longitudinal direction LD and the vertical direction. The sidewall 4j forms a flow path of molten glass that flows over the groove 4k. These side walls 4j form ridges at the lower end 4e so that the molten glass flowing through the respective side walls 4j fuses at the lower end 4e. As shown in Fig. 1, guides 7 for preventing molten glass from leaking from the side walls 4j are attached to both ends of the longitudinal direction LD of the glass sheet forming apparatus 4, respectively. As shown in Fig. 4, the guide 7 has a wedge shape when viewed from the plane, and is made of a plate material having a size capable of covering the entire cross-section of the glass plate forming apparatus 4. As shown in Fig. With respect to the vertical direction, the position of the tip of the guide 7 coincides with the lower end 4e of the glass-sheet forming apparatus 4. [ It is possible to cause the entire molten glass to flow along the side wall 4j by the operation of the guide 7.

The roll 6 serves to transport the glass ribbon 9 to the lower side of the glass plate forming apparatus 4. [ The rotational speed of the roll 6 is adjusted so that the glass ribbon 9 of the desired thickness is formed. 2, the rolls 6 are arranged symmetrically with respect to a vertical plane including the lower end 4e of the glass-sheet forming apparatus 4 so as to sandwich the glass ribbon 9 in the thickness direction. The rolls 6 are arranged at predetermined intervals in the vertical direction. The glass ribbon 9 is conveyed downward while sandwiched between these rolls 6.

As shown in Fig. 1, the heater 8 is provided on one side and the other side in the longitudinal direction LD of the glass sheet forming apparatus 4. Specifically, the heater 8 is provided in a space between the lower end 4e of the glass sheet forming apparatus 4 and the roll 6a located closest to the glass sheet forming apparatus 4 with respect to the vertical direction. The end portion of the glass ribbon 9 immediately after the fusion is locally heated by the heater 8 to prevent the viscosity of the end portion of the glass ribbon 9 immediately after the fusion from becoming excessively higher than the viscosity at the center portion. In other words, the unevenness of the viscosity in the width direction of the glass ribbon 9 is reduced. As a result, defective shape of the end portion of the glass ribbon 9 can be prevented. Also, transparency loss of the glass is prevented.

As is well known, loss of transparency is a phenomenon that crystal grains are formed in glass and transparency of glass is lowered. In the case of producing a glass plate by the down-draw method, loss of transparency tends to occur at the end of the glass ribbon 9. The reason is considered to be one cause of the fact that the flow velocity of the molten glass in the vicinity of the guide 7 is lowered and the molten glass is held in the temperature region where the loss of transparency easily occurs, though this is not necessarily clear.

When the heater 8 is disposed in the vicinity of the guide 7, not only the end of the glass ribbon 9 but also the guide 7 is heated by the heater 8. The heat of the guide 7 is transmitted to the molten glass in the vicinity of the guide 7 and only the molten glass in the vicinity of the guide 7 can be prevented from being held in the temperature region where the loss of transparency easily occurs. In particular, when the molten glass contains tin as a refining agent, tin oxide crystallizes in the glass, and transparency loss tends to occur. Therefore, the present invention is particularly encouraged when the molten glass contains tin.

In this embodiment, the heater 8 is not in contact with any of the glass sheet forming apparatus 4, the guide 7 and the furnace 2. The position of the heater 8 is adjusted so as to effectively heat the end of the glass ribbon 9 immediately after fusion. The detailed position of the heater 8 will be described with reference to Fig. The heater 8 is provided in a space outside the guide 7 attached to both ends of the glass sheet forming apparatus 4 in the longitudinal direction LD and facing the side surface 9p of the glass ribbon 9. [ More specifically, the heater 8 is installed in the space between the lower end 4e of the glass sheet forming apparatus 4 and the position P 1 where the width of the glass ribbon 9 is gradually reduced and becomes constant with respect to the vertical direction .

As shown in Fig. 3, the width of the glass ribbon 9 at the time of molding is gradually reduced from the lower end 4e of the glass plate forming apparatus 4 to the position P 1 . That is, the side face 9p is gently curved. The heater 8 faces the bent portion of the side surface 9p. By providing the heater 8 at such a position, the end portion of the glass ribbon 9 immediately after fusion can be efficiently heated. The distance H 1 in the vertical direction from the lower end 4e of the glass sheet forming apparatus 4 (the lower end of the guide 7) to the heater 8 varies depending on the output and dimensions of the heater 8, For example, 0 to 500 mm, and preferably 0 to 100 mm. The distance L 1 in the horizontal direction from the inner wall surface 7g of the guide 7 to the heater 8 is, for example, -10 to 100 mm, preferably 0 to 100 mm, 0 to 30 mm. However, care must be taken that the heater 8 does not contact the glass ribbon 9. When the distance L 1 is less than -10 mm and less than 0 mm, a part or the whole of the heater 8 is positioned on the side where the glass ribbon 9 is present with respect to the inner wall surface 7g of the guide 7 .

2, the heater 8 extends in the horizontal direction orthogonal to both the longitudinal direction (LD) and the vertical direction of the glass sheet forming apparatus 4, that is, the thickness direction of the glass ribbon 9. [ 4, the glass ribbon (9) dimension (W 1) of the heater (8) about the direction of the thickness of, the dimensions of the glass sheet forming apparatus 4 according to the direction (W 2) or the guide (7) Is larger than the dimension (W 3 ). According to this configuration, since the end portions can be uniformly heated from both sides of the front surface side and the back surface side of the glass ribbon 9, the defective shape can be prevented more effectively. In addition, since the heater 8 has a sufficient dimension W 1 , the lower portion of the guide 7 can be heated sufficiently, so that the effect of preventing loss of transparency also increases.

The energization (set temperature) of the heater 8 is appropriately controlled in consideration of the composition of the glass, the distance from the heater 8 to the glass ribbon 9, and the like. For example, in the composition of the glass plate for flat panel display, the set temperature of the heater 8 can be arbitrarily adjusted within the range of 800 to 1300 占 폚.

4, a temperature sensor 12 for detecting the temperature of the molten glass in the side wall 4j of the glass plate forming apparatus 4 and a controller 14 for acquiring a signal from the temperature sensor 12 ) May be installed. The temperature sensor 12 is attached to, for example, a lower portion of the guide 7, and indirectly detects the temperature of the molten glass. As the temperature sensor 12, for example, a thermocouple can be used. The controller (14) controls the energization of the heater (8) based on the detection result of the temperature sensor (12). For example, the temperature detected by the temperature sensor 12 and the set temperature of the heater 8 are made equal. This makes it possible to appropriately control the heater 8 regardless of the composition of the glass and to reliably prevent defective shape of the end portion of the glass ribbon 9. [

The output of the heater 8 can also be adjusted manually based on the detection result of the temperature sensor 12. [ Further, in the case of detecting the temperature at the central portion in the width direction of the molten glass at the lower end 4e of the glass sheet forming apparatus 4, a non-contact type infrared sensor can be used as the temperature sensor 12. [

The heater 8 is not particularly limited as long as it can be used at an ambient temperature exceeding 1000 캜. Specifically, as the heater 8, a linear heating element or a linear heating element may be used in the form of a coil. Radial heaters such as ceramic heaters, halogen heaters, and silicon carbide heating elements can also be used. The shape of the heater 8 is not particularly limited, and may be a rod shape as shown in Figs. 1 to 4, or a U-shape as shown in Fig. As described above, since the width of the end portion of the glass ribbon 9 is about 50 mm, the heater 8 having the shape shown in Figs. 1 to 4 is sufficient for performing the local heating. Further, it is not necessary to secure the occupation space of the heater 8 in a specific manner. On the other hand, according to the U-shaped heater 18 shown in Fig. 5, the end portion 9t of the glass ribbon 9 can be heated by surrounding the heater with the heater 18 in three directions.

The end portion of the glass ribbon 9 is heated by the heater 8 so that the end portion of the glass ribbon 9 maintains the property of the viscous fluid more strongly until it reaches the roll 6a . Therefore, as shown in Fig. 6, the glass ribbon 9 can be carried by sandwiching the end portion 9t with the roll 6a. In other words, the roll 6a is disposed at a position where the end portion 9t is sandwiched. Regarding the width direction of the glass ribbon 9, the roll 6a traverses the side surface of the glass ribbon 9. On the other hand, another roll 6 below the roll 6a does not sandwich the end portion 9t but sandwiches a portion inside the end portion 9t.

For example, as shown in Fig. 2 of Japanese Patent Application Laid-Open No. 2008-133174, it is also possible to determine the positions of the rolls so that all the rolls do not sandwich the ends of the glass ribbon. In the case where the viscosity of the end portion is high, it is wise to avoid the end portion from being inserted into the roll from the viewpoint of carrying out stable transportation or preventing the glass ribbon from cracking.

On the other hand, according to the present embodiment, since the rise of the viscosity of the end portion 9t is suppressed immediately after the fusion, the glass ribbon 9 can be conveyed by sandwiching the end portion 9t with the roll 6a. It is also possible to apply pressure to the end portion 9t with the roll 6a so that the end portion 9t is flattened to a certain degree, as shown in Fig. 6, before the glass ribbon 9 is sufficiently cured. When the end portion 9t is flat, the process of cutting the glass ribbon 9 is easy. It is possible to sandwich the end portion 9t with another roll 6 below the roll 6a. However, when the end portion 9t is inserted into the roll 6a closest to the glass sheet forming apparatus 4, 9t) is maximized. By inserting a portion inside the end portion 9t with the other roll 6, it is possible to realize stable conveyance without causing difficulty such as cracking of the glass ribbon 9. [ As described above, according to the present embodiment, it is possible to enjoy both the effect of providing the shape of the end portion 9t and the effect of stably transporting the glass ribbon 9. [

The operation of the glass plate manufacturing apparatus 100 will be briefly described. When the amount of the molten glass supplied to the groove 4k of the glass sheet forming apparatus 4 exceeds a certain amount, the molten glass flows over the groove 4k and flows down along the side wall 4j. The molten glass in the side wall 4j is heated by the heater 10 disposed around the glass plate forming apparatus 4 in order to maintain the viscosity. The molten glass flowing through the respective side walls 4j fuses at the lower end 4e, thereby forming the glass ribbon 9. The glass ribbon 9 is guided between the rolls 6 opposed to each other and the rolls 6, and is conveyed downward while being cooled slowly. The temperature of the glass ribbon 9 is lowered as it goes downward, and thus the glass ribbon 9 is solidified. The glass ribbon 9 transported out of the furnace 2 is cut to a desired size to obtain a glass plate.

The end portion 9t of the glass ribbon 9 is heated by the heater 8 so that the viscosity of the end portion 9t of the glass ribbon 9 in the vicinity of the roll 6a becomes higher It is possible to prevent the viscosity from becoming excessively high. The glass ribbons 9 are cooled to solidify to the temperature range of the glass transition point, and the vicinity of the middle of the furnace 2 is once aimed.

The viscosity of the molten glass at the lower end 4e of the glass sheet forming apparatus 4 varies depending on the composition of the glass and the manufacturing conditions. For example, in the case of producing a glass plate for a flat panel display, the viscosity of the molten glass at the lower end 4e is adjusted in the range of 10,000 to 60000 Pa · s. The viscosity of the molten glass is controlled by the temperature of the molten glass. When the temperature of the molten glass is adjusted to the range of 800 to 1000 占 폚, the viscosity of the molten glass falls within the above range. Specifically, the temperature of the atmosphere in the furnace 2 is controlled by controlling the heater 10 so that the temperature of the molten glass is 800 to 1000 占 폚 at the lower end 4e.

In particular, recently, the demand for large-area glass plates is increasing. For example, the size of a glass substrate for a liquid crystal display of the tenth generation is 2850 mm x 3050 mm. The wider the width of the glass ribbon, the more likely the non-uniformity of the viscosity in the width direction occurs, so that the effect obtained by applying the present invention also increases. A typical glass composition of a glass substrate for a flat panel display is shown below.

SiO 2 : 57 to 70 mass%

Al 2 O 3 : 13 to 19 mass%

B 2 O 3 : 8 to 13 mass%

MgO: 0 to 2 mass%

CaO: 4 to 6 mass%

SrO: 2 to 4 mass%

BaO: 0 to 2 mass%

Na 2 O: 0 to 1 mass%

K 2 O: 0 to 1 mass%

As 2 O 3 : 0 to 1 mass%

Sb 2 O 3 : 0 to 1 mass%

SnO 2 : 0 to 1 mass%

Fe 2 O 3 : 0 to 1 mass%

ZrO 2 : 0 to 1 mass%

<Examples>

A glass raw material which was combined so as to have the following composition was dissolved at 1550 占 폚 and refined at 1600 占 폚 to obtain a glass raw material having a composition of 1550 Lt; 0 &gt; C to obtain a molten glass. The reason why the total mass exceeds 100% is that an error due to rounding is included.

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%

Subsequently, molten glass was supplied to the apparatus 100 for manufacturing a glass sheet described with reference to Fig. The set temperature of the heater 8 was set at 1110 캜. The viscosity of the molten glass introduced into the glass sheet forming apparatus 4 can be estimated to be about 5000 Pa · s since the temperature of the molten glass thereof is 1200 ° C.

The molten glass was continuously supplied, and the molten glass was flowed over from the glass plate forming apparatus 4 to form a glass ribbon. The glass ribbon was cut into a predetermined size to obtain a plurality of glass plates. When examining the shape of the end portions of these glass plates, there was no bifurcated opening. Also, no obvious loss of transparency was observed in these glass plates. A glass ribbon was formed by the same procedure using a molten glass having a different composition which tends to have a high viscosity at the time of molding. As a result, a glass plate having an end portion of a good shape was obtained.

Claims (10)

A method of manufacturing a glass plate by a down-draw method in which a glass ribbon is formed by fusing a molten glass at the lower end of a glass plate forming apparatus and the glass ribbon is conveyed downward along a plurality of rolls arranged below the glass plate forming apparatus,
A space between the lower end of the glass sheet forming apparatus and the roll positioned closest to the glass sheet forming apparatus and being located outside the guide attached to both ends in the longitudinal direction of the glass sheet forming apparatus, By installing a heater,
Forming and transporting the glass ribbon while locally heating the end of the glass ribbon immediately after the fusion with the heater,
Wherein the heater is in the form of a rod extending in the thickness direction of the glass ribbon. The method of manufacturing a glass plate according to claim 1, wherein the space is a space between a lower end of the glass plate forming apparatus and a position where the width of the glass ribbon is gradually reduced and becomes constant. The glass ribbon forming apparatus according to any one of claims 1 to 5, further comprising a plurality of rollers which are located closest to the glass sheet forming apparatus among the plurality of rollers, Gt; The method according to claim 1, wherein the molten glass contains tin. A glass plate forming apparatus having a wedge-shaped cross section,
A plurality of rolls arranged downstream of the glass plate forming apparatus for feeding a glass ribbon formed by melting the molten glass flowing from the groove on the upper side of the glass plate forming apparatus to the lower end of the glass plate forming apparatus, and,
A guide attached to both ends in the longitudinal direction of the glass plate forming apparatus and preventing the molten glass from leaking from the side wall of the glass plate forming apparatus,
A space between the lower end of the glass sheet forming apparatus and the roll positioned closest to the glass sheet forming apparatus so as to locally heat the widthwise end of the glass ribbon immediately after the fusion, The heater installed in the space facing the side of the ribbon
And,
Wherein the heater is in the shape of a rod extending in the thickness direction of the glass ribbon. The apparatus for manufacturing a glass plate according to claim 5, wherein the dimension of the heater with respect to the longitudinal direction and the direction orthogonal to the vertical direction of the glass sheet forming apparatus is larger than the dimension of the glass sheet forming apparatus with respect to the direction. The glass ribbon forming apparatus according to claim 5, characterized in that, among the plurality of rolls, the roll located closest to the glass sheet forming apparatus is located at a position across the side surface of the glass ribbon with respect to the width direction of the glass ribbon Wherein the glass plate is disposed on the glass plate. The glass plate forming apparatus according to claim 5, further comprising: a temperature sensor for detecting a temperature of the molten glass at a side wall of the glass plate forming apparatus;
A controller for controlling energization of the heater based on the detection result of the temperature sensor;
Further comprising: delete delete
KR1020100022327A 2009-03-13 2010-03-12 Method and apparatus for producing glass sheet KR101740730B1 (en)

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JPJP-P-2009-061290 2009-03-13
JP2009061290A JP5005717B2 (en) 2009-03-13 2009-03-13 Glass plate manufacturing method and manufacturing apparatus

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KR101740730B1 true KR101740730B1 (en) 2017-05-26

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JP6352755B2 (en) * 2014-09-30 2018-07-04 ＡｖａｎＳｔｒａｔｅ株式会社 Glass substrate manufacturing method and glass substrate manufacturing apparatus
WO2016100739A1 (en) 2014-12-19 2016-06-23 Sun Nuclear Corporation Radiation therapy dose calculation
JP6547945B2 (en) * 2015-03-31 2019-07-24 日本電気硝子株式会社 Device for producing glass article and method for producing glass article
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JP6674138B2 (en) * 2016-05-12 2020-04-01 日本電気硝子株式会社 Glass plate manufacturing apparatus and glass plate manufacturing method
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JP7092018B2 (en) * 2018-12-18 2022-06-28 日本電気硝子株式会社 Glass plate manufacturing method
JP7148869B2 (en) * 2018-12-18 2022-10-06 日本電気硝子株式会社 Glass plate manufacturing method
KR20210104797A (en) * 2018-12-21 2021-08-25 니폰 덴키 가라스 가부시키가이샤 Glass plate manufacturing method and manufacturing apparatus therefor
JP7144750B2 (en) * 2019-06-07 2022-09-30 日本電気硝子株式会社 Glass plate manufacturing apparatus and glass plate manufacturing method
US12011616B2 (en) 2019-07-10 2024-06-18 Sun Nuclear Corporation Image-based radiation therapy quality assurance
US11600004B2 (en) 2019-07-10 2023-03-07 Sun Nuclear Corporation Image-based radiation therapy quality assurance
WO2021007459A1 (en) 2019-07-10 2021-01-14 Sun Nuclear Corporation Scintillator-based radiation therapy quality assurance
JP7488510B2 (en) * 2020-06-18 2024-05-22 日本電気硝子株式会社 Glass article manufacturing apparatus and manufacturing method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006213579A (en) 2005-02-07 2006-08-17 Nippon Electric Glass Co Ltd Apparatus and method for forming plate glass
JP2006321708A (en) * 2005-04-20 2006-11-30 Nippon Electric Glass Co Ltd Apparatus and method of forming plate glass
JP2007054028A (en) 2005-08-22 2007-03-08 Setsuya Yamazaki Hygienic device for capturing and removing cockroach or the like while reducing unpleasant feeling at capturing
JP2007112665A (en) * 2005-10-20 2007-05-10 Nippon Electric Glass Co Ltd Heating apparatus for liquid crystal sheet glass, furnace for liquid crystal sheet glass, and method of manufacturing liquid crystal sheet glass

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4277118B2 (en) * 2001-06-29 2009-06-10 旭硝子株式会社 Method and apparatus for manufacturing thin glass
JP4280977B2 (en) * 2003-04-16 2009-06-17 日本電気硝子株式会社 Sheet glass forming equipment
JP2006248855A (en) * 2005-03-11 2006-09-21 Nippon Electric Glass Co Ltd Formation apparatus for plate glass and method for forming plate glass
JP2006298736A (en) * 2005-04-25 2006-11-02 Nippon Electric Glass Co Ltd Apparatus for forming plate glass, supporting member for apparatus for forming plate glass and method for forming plate glass
JP4826722B2 (en) * 2005-08-18 2011-11-30 日本電気硝子株式会社 Sheet glass forming method
JP4753067B2 (en) * 2005-08-18 2011-08-17 日本電気硝子株式会社 Sheet glass forming method
JP5410655B2 (en) * 2007-04-10 2014-02-05 ＡｖａｎＳｔｒａｔｅ株式会社 Glass composition, glass plate using the same, and method for producing the same
JP5435394B2 (en) * 2007-06-08 2014-03-05 日本電気硝子株式会社 Tempered glass substrate and manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006213579A (en) 2005-02-07 2006-08-17 Nippon Electric Glass Co Ltd Apparatus and method for forming plate glass
JP2006321708A (en) * 2005-04-20 2006-11-30 Nippon Electric Glass Co Ltd Apparatus and method of forming plate glass
JP2007054028A (en) 2005-08-22 2007-03-08 Setsuya Yamazaki Hygienic device for capturing and removing cockroach or the like while reducing unpleasant feeling at capturing
JP2007112665A (en) * 2005-10-20 2007-05-10 Nippon Electric Glass Co Ltd Heating apparatus for liquid crystal sheet glass, furnace for liquid crystal sheet glass, and method of manufacturing liquid crystal sheet glass

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