KR20100103423A

KR20100103423A - Method and apparatus for producing glass sheet

Info

Publication number: KR20100103423A
Application number: KR1020100022327A
Authority: KR
Inventors: 키미히코 나카지마; 카츠히코 모리사다; 히로유키 카리야
Original assignee: 아반스트레이트 가부시키가이샤; 아반스트레이트 타이완 인크
Priority date: 2009-03-13
Filing date: 2010-03-12
Publication date: 2010-09-27
Also published as: JP5005717B2; TWI458689B; SG165248A1; JP2010215428A; KR101740730B1; TW201036923A

Abstract

PURPOSE: A method and an apparatus for manufacturing a glass plate are provided to uniformize the temperature distribution of the width direction of a glass ribbon by locally heating the end of the glass ribbon immediately melting the glass ribbon. CONSTITUTION: A method for manufacturing a glass plate includes a down-draw process. The down-draw process includes a step of molding a glass ribbon(9) by fusing molten glass on the lower end of an apparatus(4) of molding the glass plate and a step of returning the glass ribbon along a plurality of rollers(6) which are arranged under the apparatus for molding the glass plate. The steps for molding and returning the glass ribbon are performed by locally heating the end of the glass ribbon using a heater(8) which is installed on a space between rolls(6a).

Description

Method for manufacturing glass plate and apparatus for manufacturing {METHOD AND APPARATUS FOR PRODUCING GLASS SHEET}

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).

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

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 manufacturing apparatus 100 of the glass plate which concerns on this embodiment is the furnace 2, the glass plate forming apparatus 4 arrange | positioned at the upper part in the furnace 2, and the glass plate forming apparatus. The some roll 6 arrange | positioned under (4) and the heater 8 arrange | positioned near the lower end 4e (root) of the glass plate forming apparatus 4 are provided. According to this apparatus 100, a glass plate can be manufactured by the down-draw method which fuse | melts the molten glass which overflowed from the glass plate shaping | molding apparatus 4 at the lower end 4e, and shape | molds the glass ribbon 9. FIG.

The furnace 2 is usually made of fire brick. 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 a relatively wide range in the form of a long elongate parallel to the longitudinal direction of the glass plate shaping | molding apparatus 4. By controlling the heater 10, the temperature inside the furnace 2 can be adjusted. Specifically, a temperature gradient is formed along the vertical direction so that the glass ribbon 9 is gradually cooled when the furnace 2 is advanced downward.

The glass plate forming apparatus 4 is usually made of fire brick. As shown in FIG. 2, in the cross section orthogonal to the longitudinal direction LD of the glass plate forming apparatus 4, the glass plate forming apparatus 4 shows a wedge shape. The longitudinal direction LD of the glass plate forming apparatus 4 corresponds to the width direction of the glass ribbon 9. In the upper part of the glass plate shaping | molding apparatus 4, the groove | channel 4k for holding a molten glass is formed so that it may extend in the longitudinal direction LD. As shown in FIG. 1, the supply pipe 11 is connected to the groove 4k so that the molten glass can be continuously supplied to the groove 4k from one side of the longitudinal direction LD.

As shown in FIG. 2, the glass plate shaping | molding apparatus 4 has a pair of side wall 4j regarding the direction orthogonal to both the longitudinal direction LD and a perpendicular direction. The side wall 4j forms the flow path of the molten glass which overflowed from the groove 4k. These side walls 4j form ridges at the lower end 4e so that the molten glass flowing through each side wall 4j is fused at the lower end 4e. As shown in FIG. 1, the guide 7 which obstructs molten glass from leaking out from the side wall 4j is attached to the both ends of the longitudinal direction LD of the glass plate shaping | molding apparatus 4, respectively. As shown in FIG. 4, the guide 7 is wedge-shaped in planar view, and is made of the board | plate material of the magnitude | size which can cover the whole cross section of the glass plate forming apparatus 4. As shown in FIG. As for the vertical direction, the position of the tip of the guide 7 coincides with the lower end 4e of the glass plate forming apparatus 4. By operation of the guide 7, it is possible to flow all the molten glass along the side wall 4j.

The roll 6 plays a role of conveying the glass ribbon 9 below the glass plate forming apparatus 4. The rotation speed of the roll 6 is adjusted so that the glass ribbon 9 of the desired thickness is molded. As shown in FIG. 2, the roll 6 is arrange | positioned symmetrically with respect to the vertical surface containing the lower end 4e of the glass plate shaping | molding apparatus 4 so that the glass ribbon 9 may be fitted in the thickness direction. In addition, the roll 6 is arrange | positioned at a predetermined space | interval in a perpendicular direction. The glass ribbon 9 is conveyed downward in the state fitted to these rolls 6.

As shown in FIG. 1, the heater 8 is provided on one side and the other side of the longitudinal direction LD of the glass plate forming apparatus 4. Specifically, the heater 8 is provided in the space between the lower end 4e of the glass plate forming apparatus 4 and the roll 6a which is located nearest to the glass plate forming apparatus 4 with respect to the vertical direction. By locally heating the edge part of the width direction of the glass ribbon 9 immediately after fusion with the heater 8, the viscosity of the edge part of the glass ribbon 9 immediately after fusion is prevented from becoming too high compared with the viscosity of a center part. In other words, the nonuniformity of the viscosity with respect to the width direction of the glass ribbon 9 is reduced. As a result, the shape defect of the edge part of the glass ribbon 9 can be prevented. In addition, loss of transparency of the glass is also prevented.

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 glass ribbon 9. Although the reason is not necessarily clear, it is thought that one cause is that the flow rate of the molten glass falls in the vicinity of the guide 7, and the molten glass is kept long in the temperature region where the loss of transparency is likely to occur.

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 kept long in the temperature range where transparency loss easily occurs. In particular, when the molten glass contains tin as a clarifier, tin oxide precipitates crystals in the glass and loss of transparency is likely to occur. Therefore, when molten glass contains tin, this invention is especially encouraged.

In the present embodiment, the heater 8 does not touch any of the glass plate forming apparatus 4, the guide 7, and the furnace 2. The position of the heater 8 is adjusted to effectively heat the end of the glass ribbon 9 immediately after the fusion. The detailed position of the heater 8 is demonstrated with reference to FIG. The heater 8 is provided in the space outside the guide 7 attached to the both ends of the longitudinal direction LD of the glass plate shaping | molding apparatus 4, and the side surface 9p of the glass ribbon 9 faces. More specifically, with respect to the vertical direction, the heater 8 is installed in the space between the lower end 4e of the glass plate forming apparatus 4 and the position P ₁ where the width of the glass ribbon 9 decreases little by little. It is.

As shown in FIG. 3, the width of the glass ribbon 9 decreases little by little from the lower end 4e of the glass plate forming apparatus 4 to the position P ₁ during molding. That is, the side surface 9p is bent gently. The heater 8 faces the bent part of the side surface 9p. By providing the heater 8 in such a position, the edge part of the glass ribbon 9 immediately after fusion can be heated efficiently. The distance H _{1 in} the vertical direction from the lower end 4e (lower end of the guide 7) of the glass plate forming apparatus 4 to the heater 8 is different depending on the output, dimensions, and the like of the heater 8. For example, it is 0-500 mm, Preferably it is 0-100 mm. The horizontal distance L ₁ 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, more preferably 0 to 30 mm. However, care should be taken so that the heater 8 does not contact the glass ribbon 9. Further, the distance (L ₁₎ is more than in the case of less than -10 mm 0 mm, relative to the inner wall surface (7g) of the guide (7), the side with some or all of the glass ribbon (9) of the heater (8) It exists.

As shown in FIG. 2, the heater 8 extends in a horizontal direction perpendicular to both the longitudinal direction LD and the vertical direction of the glass plate forming apparatus 4, that is, in 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 greater than the dimension (W ₃ ). According to such a structure, since the edge part can be heated uniformly from both sides of the front side and the back surface side of the glass ribbon 9, a shape defect can be prevented more effectively. Further, since the heater (8) has sufficient dimensions (W ₁₎ of the guide can be sufficiently heated bottom view of (7) by being has, the higher the effect of preventing the loss of transparency.

The energization (setting 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 displays, the set temperature of the heater 8 can be arbitrarily adjusted in the range of 800-1300 degreeC.

Moreover, as shown in FIG. 4, the temperature sensor 12 which detects the temperature of the molten glass in the side wall 4j of the glass plate forming apparatus 4, and the controller 14 which acquires the signal from the temperature sensor 12 ) Can also be installed. The temperature sensor 12 is attached to the lower part of the guide 7, for example, and detects the temperature of a molten glass indirectly. As the temperature sensor 12, a thermocouple can be used, for example. 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. By doing in this way, the heater 8 can be appropriately controlled regardless of the composition of glass, and the shape defect of the edge part of the glass ribbon 9 can be prevented reliably.

In addition, based on the detection result of the temperature sensor 12, the output of the heater 8 can also be adjusted manually. In addition, when detecting the temperature of the center part of the width direction of the molten glass in the lower end 4e of the glass plate shaping | molding apparatus 4, a non-contact infrared sensor can be used as the temperature sensor 12. As shown in FIG.

The heater 8 is not particularly limited as long as it can be used even at an ambient temperature exceeding 1000 ° C. Specifically, a coil having a linear heating element or a linear heating element can be used as the heater 8. Moreover, radial heaters, such as a ceramic heater, a halogen heater, and a silicon carbide heating element, 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 may be a U shape as shown in Fig. 5. As mentioned above, since the width | variety of the edge part of the glass ribbon 9 is about 50 mm, it is necessary enough with the heater 8 of the shape shown in FIGS. 1-4 in order to perform local heating. In addition, it is not necessary to secure the space occupied by the heater 8 on purpose. On the other hand, according to the U-shaped heater 18 shown in FIG. 5, the edge part 9t of the glass ribbon 9 is enclosed with the heater 18 in 3 directions, and can be heated.

According to this embodiment, since the edge part of the glass ribbon 9 is heated by the heater 8, the edge part of the glass ribbon 9 maintains the property of a viscous fluid stronger until it reaches the roll 6a. Doing. For this reason, as shown in FIG. 6, the glass ribbon 9 can be conveyed by sandwiching the edge part 9t by the roll 6a. In other words, the roll 6a is arrange | positioned in the position which pinches the edge part 9t. As for the width direction of the glass ribbon 9, the roll 6a has crossed the side surface of the glass ribbon 9. As shown in FIG. On the other hand, the other roll 6 which is lower than the roll 6a does not fit the edge part 9t, but pinches the part inside rather than the edge part 9t.

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 edge part 9t is suppressed immediately after fusion, the glass ribbon 9 can be conveyed by pinching the edge part 9t with the roll 6a. Moreover, as long as the glass ribbon 9 is fully hardened | cured, it is also possible to apply pressure to the edge part 9t with the roll 6a so that the edge part 9t may become flat to some extent. When the edge part 9t is flat, the process of cutting the glass ribbon 9 is easy. It is also possible to sandwich the end 9t with the other roll 6 below the roll 6a. However, if the end 9t is sandwiched with the roll 6a closest to the glass plate forming apparatus 4, the end ( 9t) has the highest effect of flattening. And if the part inside of the edge part 9t is pinched by the other roll 6, it will not cause difficulty, such as the crack of the glass ribbon 9, and can achieve stable conveyance. Thus, according to this embodiment, both the effect of having the shape of the edge part 9t, and the effect of conveying the glass ribbon 9 stably can be enjoyed.

The operation of the apparatus 100 for producing a glass plate will be briefly described. When the amount of the molten glass supplied to the groove 4k of the glass plate forming apparatus 4 exceeds a certain amount, the molten glass overflows from 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 arrange | positioned around the glass plate forming apparatus 4, in order to maintain viscosity. The molten glass which flowed through each side wall 4j fuses at the lower end 4e, and the glass ribbon 9 is shape | molded accordingly. The glass ribbon 9 is guided between the roll 6 and the roll 6 which oppose each other, and is conveyed downward while gradually cooling. The temperature of the glass ribbon 9 is lowered as it proceeds downward, thereby solidifying the glass ribbon 9. When the glass ribbon 9 conveyed out of the furnace 2 is cut to a desired size, a glass plate is obtained.

According to this embodiment, since the edge part 9t of the glass ribbon 9 is heated by the heater 8, the viscosity of the edge part 9t of the glass ribbon 9 in the vicinity of the roll 6a becomes the center part. It can prevent that it becomes too high compared with a viscosity. The glass ribbon 9 is cooled to the temperature range of a glass transition point, and is solidified at the center of the middle in the furnace 2 once.

The viscosity of the molten glass in the lower end 4e of the glass plate shaping | molding apparatus 4 changes according to a composition and manufacturing conditions of glass. For example, when manufacturing the glass plate for flat panel displays, the viscosity of the molten glass in the lower end 4e is adjusted to the range of 10000-60000 Pa.s. The viscosity of a molten glass is managed by the temperature of a molten glass. When the temperature of a molten glass is adjusted to the range of 800-1000 degreeC, the viscosity of a molten glass is contained in the said range. Specifically, the heater 10 is controlled so that the temperature of the molten glass becomes 800 to 1000 ° C at the lower end 4e, and the atmosphere temperature in the furnace 2 is adjusted.

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%

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 manufacturing apparatus 100 of the glass plate demonstrated with reference to FIG. The set temperature of the heater 8 was 1110 degreeC. Since the viscosity of the molten glass which flowed into the glass plate forming apparatus 4 is equivalent to about 5000 Pa.s, since the temperature of this molten glass is 1200 degreeC, it is inferred.

The molten glass was continuously supplied, the molten glass was overflowed from the glass plate forming apparatus 4, and the glass ribbon was shape | molded. The glass ribbon was cut to a predetermined size to obtain a plurality of glass plates. When the shape of the edge part of these glass plates was examined, it did not open in two ways. In addition, no apparent loss of transparency occurred in these glass plates. In addition, the glass ribbon was shape | molded by the same procedure using the molten glass of the separate composition which tends to become high viscosity at the time of shaping | molding. As a result, a glass plate having an end of a good shape was obtained.

Claims

As a manufacturing method of the glass plate by the down-draw method which fuse | melts a molten glass in the lower end of a glass plate forming apparatus, shape | molds a glass ribbon, and conveys the said glass ribbon downward along the some roll arrange | positioned under the said glass plate forming apparatus,
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.

The method for manufacturing a glass plate according to claim 1, wherein the space is a space outside the guides affixed to both ends in the longitudinal direction of the glass plate forming apparatus and facing the side surface 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 decreases little by little.

The manufacturing method of the glass plate of Claim 1 which pinches the edge part of the said glass ribbon with the said roll located nearest from the said glass plate forming apparatus.

The manufacturing method of the glass plate of Claim 1 in which the said molten glass contains tin.

A glass plate forming apparatus having a wedge-shaped cross section,
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.

The longitudinal direction end part of the said glass plate shaping | molding apparatus is equipped with the guide which prevents the molten glass from leaking out from the side wall of the said glass plate shaping | molding apparatus, The said space is outer side than the said guide, The manufacturing apparatus of the glass plate which is a space which a side surface faces.

The manufacturing apparatus of the glass plate of Claim 6 in which the dimension of the said heater about the direction orthogonal to the longitudinal direction and the perpendicular direction of the said glass plate forming apparatus is larger than the dimension of the said glass plate forming apparatus regarding the said direction.

The manufacturing apparatus of the glass plate of Claim 6 in which the said roll located closest to the said glass plate forming apparatus is arrange | positioned in the position which pinches the edge part of the said glass ribbon.

The temperature sensor which detects the temperature of the said molten glass in the side wall of the said glass plate shaping | molding apparatus,
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.