JP2008088005A - Apparatus and method for manufacturing glass sheet, glass product and manufacturing method of liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for manufacturing a glass sheet by the down draw method, preparing the glass sheet with higher flatness by inhibiting the occurrence of an air current produced by the draft effect, a method of manufacturing a glass sheet by using the apparatus, and a method of manufacturing a glass product, whereby various glass products are manufactured from the glass sheet prepared thereby. <P>SOLUTION: Pairs of movable partitions 4 are supported by fixed partitions 3 established on both ends in the width direction of the glass sheet G with a prescribed clearance between the partially molded glass sheet G passing through annealing chambers 10a-10k in an annealing step. Respective pairs of the movable partitions are holizontally slidably arranged along the direction of the thickness of the glass sheet G and facing each other on opposite sides of the glass sheet G. The distance between the movable partitions in each pair can be adjusted so that their distances from the glass sheet G can be minimized. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a plate glass manufacturing apparatus for manufacturing a plate glass by slowly cooling the molten glass while lowering the molten glass along the vertical direction, and a method of manufacturing the plate glass using such a device, In addition, the present invention relates to a method for manufacturing a glass product.

  Examples of plate glass manufacturing methods include: 1) Full coal method in which molten glass is pulled up vertically from a melting tank and shaped into a plate shape; 2) Fused glass is floated in a molten tin tank to a predetermined thickness and then pulled out in a horizontal direction. Float method, 3) Fusion method in which molten glass is flowed down along both sides of a wedge-shaped molded body, and then the molten glass joined at the lower end of the molded body is vertically lowered and molded into a plate shape. It has been.

A plate glass manufacturing method in which the molten glass is pulled up vertically as in the full coal method is also referred to as an updraw method. For example, Patent Document 1 and Patent Document 2 show examples thereof. Moreover, the manufacturing method of the plate glass which pulls down a molten glass to the vertically downward direction like the fusion method is also called the down draw method, For example, patent document 3 shows the example.
These methods can be said to be advantageous in maintaining the flatness of the surface of the plate glass because the influence of gravity exerted on the two main surfaces facing each other in the thickness direction of the plate glass is equal in the slow cooling step.

Japanese Examined Patent Publication No. 39-7915 Japanese Patent Publication No.43-4278 Japanese Patent Laid-Open No. 10-53426

  By the way, Patent Document 1 aims to reduce strain or remove blisters during slow cooling (annealing) of sheet glass, and Patent Document 2 reduces planar strain that occurs in a glass sheet during slow cooling and makes the distribution uniform. However, both are intended to adjust the temperature distribution on the surface of the glass sheet by controlling the rising air flow (draft effect) in the slow cooling chamber with high-temperature molten glass. The airflow that stores the heat from the bath is actively used to heat the annealing chamber.

  On the other hand, in the case of the downdraw method as in Patent Document 3, unlike the updraw method as in Patent Document 1 and Patent Document 2, there is no high-temperature large heat source (molten glass) at the bottom of the molding apparatus. For this reason, the temperature adjustment function by the draft effect like the up-draw method cannot be expected. Rather, the generation of the airflow by the draft effect only causes a harmful effect due to the partial cooling.

  That is, in the downdraw method, there is no large heat source such as a molten glass bath below the slow cooling chamber, but the atmosphere in the vicinity of the plate glass is heated by the high-temperature glass, and airflows having different temperatures are generated along the plate glass surface. And if the surface of a plate glass is partially cooled by this air flow and a temperature difference arises in the plate glass surface by such a partial cooling, the flatness of the plate glass surface will deteriorate.

  In recent years, as typified by flat glass used in flat panel displays that have been increasing in size, there has been an increasing demand for thinning and flatness of flat glass, and in order to manufacture flat glass with higher flatness. It is also necessary to suppress the influence of such airflow. In addition, the thinner the wall, the greater the influence of airflow on the flatness of the flat glass surface, so it is possible to obtain a thin and high flatness glass plate. It is desirable to suppress the appearance of the draft effect as much as possible.

  The present invention has been made in view of the above circumstances, and in producing a plate glass by a downdraw method, the production of a plate glass capable of suppressing the generation of airflow due to the draft effect and obtaining a plate glass with higher flatness. It aims at providing the manufacturing method of the glass product which manufactures a various glass product from the apparatus, the manufacturing method of the plate glass using such a manufacturing apparatus, and the plate glass obtained by such a method.

  The plate glass manufacturing apparatus according to the present invention is a plate glass manufacturing apparatus that slowly cools molten glass while forming it into a plate shape while being pulled down along the vertical direction, and a plurality of slow cooling chambers through which the plate glass in the middle of forming passes. And the temperature of the slow cooling chamber is controlled independently while suppressing the flow of airflow between the adjacent slow chambers.

  According to the plate glass manufacturing apparatus according to the present invention configured as described above, it is possible to manufacture plate glass with higher flatness by suppressing the flow of airflow between adjacent grace chambers.

  In addition, the plate glass manufacturing apparatus according to the present invention, more specifically, with a predetermined clearance with respect to the plate glass passing through the gradual chamber, fixed partition walls installed on both ends in the width direction of the plate glass, A structure in which the slow cooling chamber is partitioned by a pair of movable partition walls that are opposed to each other so as to sandwich the plate glass and are supported by the fixed partition wall so as to be slidable horizontally along the thickness direction of the plate glass. It can be.

  Further, in the plate glass manufacturing apparatus according to the present invention, the heat insulation performance of the furnace wall defining the slow cooling chamber is adjusted independently for each of the slow cooling chambers together with the fixed partition wall and the movable partition wall. It can be.

  In addition, the method for producing a plate glass according to the present invention is a method for producing a plate glass that is gradually cooled while being shaped into a plate shape while pulling down the molten glass along the vertical direction, while suppressing the flow of mutual airflow, This is a method in which a glass sheet in the middle of molding is passed through a plurality of annealing chambers, each of which is independently temperature controlled, and cooled slowly.

  According to the plate glass manufacturing method according to the present invention as described above, when the plate glass being formed is gradually cooled by passing through a plurality of slow cooling chambers, the flow of airflow between adjacent gradual chambers is suppressed. And plate glass with higher flatness can be manufactured.

Moreover, the manufacturing method of the plate glass which concerns on this invention is a fixed partition installed in the width direction both ends of the said plate glass with the predetermined clearance with respect to the said plate glass which passes the said gradual chamber in the thickness direction of the said plate glass. The distance between the pair of movable partition walls supported so as to be horizontally slidable and facing each other so as to sandwich the plate glass is set so that the gap between the plate glass is as much as possible at the stage where the molding has stabilized. By adjusting so that it may become small, it can be set as the method of suppressing the flow of the mutual air flow between the said gradual chambers.
With such a method, while avoiding contact with the plate glass at the start of operation, in the steady operation where the molding is stable, by sliding the movable partition according to the thickness of the plate glass at that time The gap formed between the glass plates can be made as small as possible to suppress the flow of airflow between adjacent aging chambers.

  In addition, the method for producing a glass sheet according to the present invention includes separately adjusting the heat insulating performance of the furnace wall defining the slow cooling chamber together with the fixed partition wall and the movable partition wall for each of the slow cooling chambers. It can be set as the method of shaping | molding.

  Moreover, the manufacturing method of the plate glass which concerns on this invention can be made into the method whose thickness of the plate glass to be obtained is 1.5 mm or less, and is especially suitable when it is going to obtain such a thin plate glass. It is.

  In addition, the method for producing a glass product according to the present invention includes a plurality of slow cooling methods in which molten air is formed into a plate shape while being pulled down along the vertical direction, the flow of mutual airflow is suppressed, and the temperature is controlled independently. It is a method of dividing a plate glass that is gradually cooled by passing through a chamber, and the liquid crystal display manufacturing method according to the present invention is a method of forming a plate while lowering the molten glass along the vertical direction, Including a step of forming at least a wiring pattern on a glass substrate obtained by dividing a plate glass formed by passing a plurality of slow cooling chambers, each of which is flow-suppressed and independently controlled, and which is slowly cooled. There is a way.

  As described above, according to the present invention, the molten glass is formed into a plate shape while being pulled down along the vertical direction, and when the plate glass is manufactured by passing through a plurality of annealing chambers and gradually cooling, it is adjacent. By suppressing the flow of airflow between the slow chambers, a flat glass with higher flatness can be produced.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
In addition, FIG. 1 is explanatory drawing which shows the outline of the manufacturing apparatus of the plate glass in this embodiment. FIG. 2 is an enlarged view of a main part of the manufacturing apparatus 10 shown in FIG. 1, and shows one annealing chamber and a part of the aging chamber adjacent to the upper and lower sides. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG.

The manufacturing apparatus 10 includes a bowl-shaped molded body 1 connected to a molten glass supply unit (not shown). As the molded body 1, a so-called feeding cell can be used, and as shown in the figure, molten glass flowing out along both side surfaces of the molded body 1 joins at the lower end.
The molten glass joined at the lower end portion of the molded body 1 is pulled down along the vertical direction as it is, and is formed into a plate shape, and then is subjected to a slow cooling step to become a plate glass G and is taken out from the manufacturing apparatus 10.

  Moreover, as for the manufacturing apparatus 10, the internal space enclosed with the furnace wall 2 is partitioned off into the some annealing room 10a-10k. Each of the slow chambers 10a to 10k is provided with an independent heating means 6, and is controlled to a predetermined temperature by a control means (not shown).

  As shown in the drawing, the sheet glass G in the process of slow cooling is sandwiched by a plurality of pairs of rollers 5 at both ends in the width direction (in the direction perpendicular to the paper surface in FIG. 1). It goes out downward. At this time, each of the slow cooling chambers 10a to 10k is set and controlled so that the temperature is sequentially lowered toward the lower direction that is the traveling direction of the plate glass G, and passes through these slow cooling chambers 10a to 10k. Thus, the plate glass G is subjected to distortion removal and cooling while maintaining high flatness.

  In this way, when the plate glass G is formed and slowly cooled, the partition walls that partition the slow cooling chambers 10a to 10k must be provided with a through passage that allows the plate glass G to pass. If a large gap is formed between the two, an air flow due to the draft effect is generated between adjacent slow cooling chambers controlled at different set temperatures. And when such a flow of airflow occurs along the main surface of the plate glass G (surface with the largest area facing the thickness direction), the uniformity of the temperature distribution along the width direction of the plate glass G is disturbed, The flatness of the surface of the plate glass G will be adversely affected.

  If the dimension of the through passage is set so that the gap between the glass sheets G is as small as possible, the flow of airflow between adjacent grace chambers is suppressed, although it seems that there is no such inconvenience, Usually, when the operation of the manufacturing apparatus 10 is started, the thickness of the sheet glass G in the process of forming is considerably thicker than that in the steady operation.

  Therefore, when the dimension of the through passage is set based on the thickness of the plate glass G during steady operation, the plate glass G contacts the partition wall at the start of operation, which hinders molding. On the other hand, if the dimension of the through-passage is set based on the thickness of the plate glass G at the start of operation, a large gap is formed between the plate glasses G in the normal operation, and the adjacent gradual chambers are mutually connected. The flow of air cannot be suppressed.

  For this reason, in this embodiment, while installing the fixed partition 3 on the both ends in the width direction of the plate glass G with a predetermined clearance with respect to the plate glass G in the middle of molding passing through the slow cooling chambers 10a to 10k, The gradual chambers 10a to 10k are partitioned by supporting a pair of movable partition walls 4 opposed to each other so as to sandwich the sheet glass G and horizontally slidable along the thickness direction of the sheet glass G. Yes.

  By doing in this way, the magnitude | size of the clearance gap formed between plate glass G can be adjusted by making a pair of movable partition 4 made slidable approach and space apart, and, thereby, plate glass G It is possible to form a through-passage that allows passage of the glass sheet G while always ensuring an appropriate gap between the two. As a result, while avoiding contact with the plate glass G at the start of operation, during the steady operation, the movable partition wall 4 is slid according to the thickness of the plate glass G at that time, so that it is between the plate glass G. The gap formed can be made as small as possible to suppress the flow of airflow between adjacent aging chambers.

The specific configuration of each part forming the manufacturing apparatus 10 can use a known glass manufacturing apparatus of this kind, but the movable partition 4 is slidable and relatively thin and thin. It is preferably made of a plate material. On the other hand, there is a temperature difference between the slow cooling chambers partitioned by the movable partition wall 4, and when a metal or the like is used as the material of the movable partition wall 4, the temperature difference generated between the upper surface and the lower surface causes the movable partition wall 4. There is a risk of warping.
For this reason, in order to insulate between the slow cooling chambers while suppressing the warp of the movable partition wall 4, it is preferable to configure the movable partition wall 4 using a ceramic plate material. More specifically, a ceramic fiber board or the like that has excellent heat insulating properties even when thin and hardly warps due to a temperature difference can be exemplified.

  Incidentally, in the illustrated example, each of the gradual chambers 10a to 10k is provided with an independent heating means 6 so that the temperature is controlled, but when maintaining the temperature in the gradual cooling chamber at a desired temperature, It is conceivable to install a heat exchanger that passes through a low-temperature heat medium as a cooling means in the slow cooling chamber, but air at a temperature close to that heat medium will be created around the low-temperature heat medium, and at the same time heat exchange If the vessel takes away ambient heat more than necessary, the output of the heating means 6 needs to be increased. This improvement in the output of the heating means naturally means that the temperature of the heat source rises, so that air having a temperature close to that heat source is created near the heat source. Low-temperature air near the low-temperature heat medium and high-temperature air near the high-temperature heat source that exist in the same space (annealing chamber) cause airflow. The larger the temperature difference, the more the airflow is generated. The energy increases and can trigger the temperature distribution of the sheet glass G present in the space. Therefore, in order to obtain a flat glass with a higher degree of flatness, the temperature in the slow cooling chamber is not increased by heating with a high-temperature heat source or cooling with a low-temperature heat medium that induces the generation of airflow in the slow-cooling chamber. It is preferable to control.

As one of such temperature control means, the heat released from the glass sheet G in the process of forming is used as a heat source to secure a necessary amount of heat in the annealing chamber, and a part of the heat is released to the outside as needed. By doing so, it is conceivable to control the temperature in each annealing chamber to a desired temperature. In order to realize such temperature control means, the heat insulation performance of the furnace wall 2 that defines the slow cooling chamber together with the fixed partition wall 3 and the movable partition wall 4 may be adjusted for each slow cooling chamber.
That is, for example, in the upper cooling chamber where the glass sheet G is high in temperature, the furnace wall 2 is provided with high heat insulation performance to avoid a sudden temperature drop, while the temperature of the glass sheet G is lowered and the heat insulation performance is gradually lowered. To go. Then, the heat insulation performance to be imparted to the furnace wall 2 of each slow cooling chamber is independently adjusted so that the heat insulation performance becomes lower as the furnace wall 2 of the lower slow cooling chamber and a suitable temperature gradient is obtained. do it.

  In adjusting the heat insulating performance, more specifically, the thickness of the ceramic fiber heat insulating board affixed to the inside of the furnace wall 2 of the slow cooling chamber as a heat insulating material is made sufficiently thick in the upper cooling chamber. On the other hand, it gradually becomes thinner as it goes down. And when the amount of heat radiation is insufficient, without using a heat insulating material, a steel wall is exposed, and if necessary, a heat insulating performance such as applying a paint for increasing the emissivity to the inner surface and the outer surface of the furnace wall 2 An adjustment method can be used.

In adjusting the heat insulation performance of the furnace wall 2 as described above, if the heat insulation performance of the furnace wall 2 facing both ends in the width direction of the plate glass G is lowered, the temperature distribution in the width direction of the plate glass G is affected. The influence on the flatness of the plate glass G is great. For this reason, it is preferable to increase / decrease the degree of the heat insulation performance of the furnace wall 2 facing the main surface of the plate glass G while maintaining the heat insulation performance at this portion at a certain level or more.
That is, in this embodiment, the heat insulation performance of the part facing the main surface of the sheet glass G in the furnace wall 2 that defines the slow cooling chamber together with the fixed partition wall 3 and the movable partition wall 4 is the same for each slow cooling chamber. It is particularly preferable that the adjustment is performed independently.

  When the sheet glass G is formed by the manufacturing apparatus 10 as described above, the molten glass flowing out of the formed body 1 is drawn into the slow cooling chambers 10a to 10k while being formed into a plate shape while being pulled down along the vertical direction. However, as described above, at the initial stage when molding is started, the thickness of the glass sheet G during molding is considerably thicker than that during steady operation. For this reason, at the start of molding, the distance between the pair of movable partition walls 4 is made sufficiently wide so that the movable partition walls 4 do not hinder the feeding of the plate glass G.

And when shaping | molding becomes stable and the thickness of the plate glass G in the middle of shaping | molding has approached the thickness at the time of a steady operation, the separation distance of the movable partition 4 is narrowed, and the clearance gap between the plate glasses G becomes as small as possible. In this way, the flow of mutual airflow between adjacent gradual chambers is restrained in this way, while the flow of mutual airflow is restrained, and each of the plurality of slow cooling chambers 10a to 10k that are independently temperature controlled. By passing the plate glass in the middle of molding and gradually cooling, a plate glass with higher flatness can be obtained. And since the influence of the airflow on the deterioration of the flatness of the plate glass G becomes relatively larger as the thickness is reduced, the thickness of the plate glass G to be obtained is as thin as 1.5 mm or less. This is particularly suitable.

Here, the plate glass G swings in the width direction while being pulled by the rotor 5 during the period from the start of the operation to the transition to the steady operation. For this reason, if there is no gap (refer to FIG. 3) between the side surfaces (end surfaces at both ends in the width direction) of the plate glass G and the fixed partition 3, the plate glass G comes into contact with the fixed partition 3.
Further, since the flatness of the glass sheet G is greatly influenced by the temperature distribution of the main surface, it is necessary to sufficiently suppress the flow of airflow due to the draft effect along the main surface. Along with the width shrinkage due to the surface tension after separation from the molded body 1, the glass has a thickness nearly twice that of the central portion of the plate glass G, and functions as a so-called “column”. For this reason, even if an air flow due to the draft effect is generated along the side surface of the glass sheet G, the flatness of the glass sheet G is not significantly affected.
Therefore, after shifting to the steady operation, the glass sheet G does not sway in the width direction, and there is no need to provide a gap between the side surface of the glass sheet G and the fixed partition wall 3, but in a state where a gap remains in this portion. You can drive.

  The plate glass G taken out from the manufacturing apparatus 10 through the slow cooling process is divided into a predetermined size and processed into various glass products. At this time, if both end portions in contact with the knurled roll or the roller 5 are cut off, a plate-shaped glass product having a very flat main surface and high parallelism between the main surfaces is obtained. be able to.

  Examples of the glass product manufactured by dividing the plate glass G include a plate-like glass product that requires high-precision flatness, such as a glass substrate and a cover glass.

  More specifically, for example, an alkali-free glass having an aluminoborosilicate-based composition is used as a glass raw material, the glass sheet G is formed by the manufacturing apparatus 10, slowly cooled, then cut along the width direction, and both end portions are By cutting off, a glass substrate for a TFT active matrix type liquid crystal display can be manufactured, and a TFT array and a wiring pattern can be satisfactorily formed on the glass substrate.

  In this way, if the obtained glass sheet G is divided into a desired size and shape, a flat plate with high accuracy can be obtained by simply forming the sheet thickness to a target thickness without polishing the main surface. Although a glass product requiring a surface can be produced, the obtained plate glass G may be polished on its main surface as necessary. In this case, since the original main surface has a high degree of flatness, the main surface after polishing can be made a more accurate flat surface without much effort in the polishing process.

More specifically, for example, a plate glass G made of a predetermined glass raw material is formed, cut into a desired length, and after both end portions are cut off, a disk is cut out and a hole is opened in the center, If the main surface is ground and polished to finish a disk-shaped glass substrate, a glass substrate for an information recording medium such as a magnetic disk can be obtained. An information recording medium such as a magnetic disk can be obtained by forming a magnetic recording film on the main surface of the glass substrate.
In addition, if the obtained plate glass G is cut into a rectangular or square shape and the main surface is ground and polished, various cover glasses such as a cover glass for a mobile phone and a cover glass for a digital camera can be obtained. .

  These glass products are thin glass products because they are ground and polished further, but they are strengthened by immersion in a mixed molten salt of sodium nitrate and potassium nitrate for chemical strengthening. Therefore, it can be finished into a product excellent in terms of reliability and durability.

  In the above example, the glass piece cut out from the plate glass G is ground and polished. However, the main surface of the plate glass G may be ground and polished, and then cut out or after the main surface of the plate glass G is ground. The main surface of the cut and cut glass may be polished.

  Next, the present invention will be described in detail with specific examples.

[Example]
Using the production apparatus 10 shown in FIG. 1, the glass transition point is 500 ° C., the strain point is 460 ° C., the average linear expansion coefficient from 100 ° C. to 300 ° C. is 90 × 10 ⁻⁷ / ° C., and Li ₂ O as a glass component and glass material having a composition of aluminosilicate containing Na 2 _O, it was molded glass sheet G. At this time, it adjusted so that the clearance gap formed between the movable wall 4 which partitions each slow cooling chamber, and the plate glass G in the middle of shaping | molding may be maintained at about 2-3 mm in the stage where shaping | molding has stabilized. . And it pulled down along the perpendicular direction with the shaping | molding speed of 12 mm / sec, and shape | molded the plate glass G of width 600mm and thickness 1.1mm.

  In addition, the set temperature of each slow cooling chamber will be 520 degreeC, 510 degreeC, 500 degreeC, 480 degreeC, 440 degreeC, 400 degreeC, 360 degreeC, 320 degreeC, 280 degreeC, 240 degreeC, 180 degreeC in order from the top. Was controlled as follows. At this time, a heat insulating board made of ceramic fiber was lined with a thickness of 150 mm on the inner side of the furnace wall facing both ends in the width direction of the plate glass G among the furnace walls partitioning each annealing chamber. Moreover, in the furnace wall facing the main surface of the glass plate G, the thickness of the heat insulation board is set to 150 mm in the uppermost slow cooling chamber, and the thickness of the heat insulation board is reduced according to the set temperature as it goes downward, No heat insulation board was installed in the lowest annealing room.

  The plate glass that had been slowly cooled was cut and further processed into a desired shape and size, and then immersed in a mixed molten salt of sodium nitrate and potassium nitrate for chemical strengthening. Thus, various cover glasses such as a cover glass for a mobile phone and a cover glass for a digital camera were produced. These cover glasses have high scratch resistance and high reliability.

  Next, the glass was changed to alkali-free glass having an aluminoborosilicate composition, and the same molding was performed. The obtained slowly cooled plate glass was cut into a liquid crystal display substrate, and a polysilicon wiring pattern was formed on the substrate to form a TFT array. And the liquid crystal display was produced using this board | substrate.

[Comparative example]
A sheet glass G was formed in the same manner as in the example except that the gap formed between the movable wall 4 partitioning each slow cooling chamber and the sheet glass G in the middle of forming was 20 mm or more.

  When the obtained plate glass G was cut into a 600 mm square and the degree of warpage was examined, the maximum value of the warpage in the example was improved by 50% or more on average with respect to the comparative example. Further, the variation of the warp value was improved by 50% or more.

  Although the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  That is, the illustrated molding apparatus 10 is an example, and includes a plurality of slow cooling chambers through which glass plates in the middle of molding pass, and the temperature of the slow cooling chamber is controlled while suppressing the flow of airflow between adjacent slow chambers. If it comes to be controlled independently, it will not be restricted to this. Details of the apparatus, such as the number of slow cooling chambers, the arrangement of heating means provided in the slow cooling chamber, and the arrangement of rollers for feeding out plate glass in the middle of molding, can be appropriately changed as necessary.

  Further, in the illustrated example, the movable partition 4 is supported by a step formed on the end face of the fixed partition 3 so as to be slidable (see FIG. 4). The specific means to be supported is not limited to this as long as the pair of movable partition walls 4 can be moved closer to and away from each other and the size of the gap formed between the glass plates G can be adjusted.

  According to the present invention, a plate glass having a high surface flatness can be easily produced.

It is explanatory drawing which shows the outline of embodiment of the manufacturing apparatus of the plate glass which concerns on this invention. It is a principal part enlarged view of the manufacturing apparatus shown in FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molded object 3 Fixed partition 4 Movable partition 6 Heating means 10 Manufacturing apparatus 10a-10k Slow cooling chamber G Sheet glass

Claims (9)

An apparatus for producing sheet glass that is gradually cooled while being shaped into a plate shape while pulling down the molten glass along the vertical direction,
While having a plurality of annealing chambers through which the plate glass in the middle of molding passes,
An apparatus for producing sheet glass, wherein the temperature of the slow cooling chamber is controlled independently while suppressing the flow of airflow between the adjacent gradual chambers. With a predetermined clearance with respect to the plate glass passing through the gradual chamber, fixed partition walls installed on both ends in the width direction of the plate glass;
With a pair of movable partitions supported by the fixed partition so as to be opposed to each other so as to sandwich the plate glass and to be horizontally slidable along the thickness direction of the plate glass,
The plate glass manufacturing apparatus according to claim 1, wherein the annealing chamber is partitioned.   The apparatus for producing sheet glass according to claim 2, wherein the heat insulation performance of the furnace wall defining the slow cooling chamber is adjusted independently for each of the slow cooling chambers together with the fixed partition wall and the movable partition wall. A method for producing plate glass that is gradually cooled while forming a plate shape while pulling down the molten glass along the vertical direction,
A method for producing a sheet glass, characterized in that a sheet glass in the middle of molding is passed through a plurality of annealing chambers, each of which is independently temperature-controlled while suppressing the flow of mutual airflow, and then gradually cooled. With a predetermined clearance with respect to the plate glass passing through the gradual chamber, it is supported by fixed partition walls installed at both ends in the width direction of the plate glass so that it can slide horizontally along the thickness direction of the plate glass. , A separation distance between a pair of movable partition walls facing each other so as to sandwich the plate glass,
The manufacturing of the plate glass according to claim 4, wherein the flow of the air flow between the adjacent aging chambers is suppressed by adjusting the gap between the plate glasses to be as small as possible when the molding has been stabilized. Method.   The plate glass production according to claim 5, wherein, for each of the slow cooling chambers, together with the fixed partition wall and the movable partition wall, the heat insulation performance of the furnace wall that defines the slow cooling chamber is independently adjusted to perform glass molding. Method.   The manufacturing method of the plate glass of any one of Claims 4-6 whose thickness of the plate glass to be obtained is 1.5 mm or less.   Splitting the glass plate that is formed by cooling the molten glass through a plurality of annealing chambers, each of which is controlled in temperature, while the molten glass is shaped into a plate shape while being pulled down along the vertical direction. A method for producing a glass product, comprising:   Splitting the glass plate that is formed by cooling the molten glass through a plurality of annealing chambers, each of which is controlled in temperature, while the molten glass is shaped into a plate shape while being pulled down along the vertical direction. A method for producing a liquid crystal display, comprising a step of forming at least a wiring pattern on a glass substrate obtained by performing the steps.

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