TW201602036A - Apparatus for manufacturing glass, method for manufacturing glass using the same, glass and display device - Google Patents

Abstract

An object of the present invention is to provide an apparatus and a method for manufacturing glass, a glass and a display device. The apparatus and a method for manufacturing glass may effectively remove surface glass, which is created by volatilization of low-density volatile molecules such as boric acid, before the surface glass is put into a forming facility, in a case in which a combustion space or a free volatile glass surface is present when manufacturing glass, thereby manufacturing a very homogeneous glass substrate for a display in which an optical distortion defect and mechanical surface waviness are not present in the product.

Description

Glass manufacturing apparatus and glass manufacturing method using same

The present application claims priority to and the benefit of the Korean Patent Application No. 10-2014-0079513, filed on June 27, 2014, in the Korean Intellectual Property Office, the entire contents of which are hereby incorporated by reference. .

The present invention relates to a glass manufacturing apparatus and a method of manufacturing a glass using the same, the apparatus and the method for manufacturing a glass of a display or other optical or mechanical properties requiring high surface homogeneity Glass for use.

The glass substrate of the display, which represents the glass substrate of the LCD, in particular requires high standard specifications. The glass substrate is required to be highly resistant to various chemicals used in the process of manufacturing the glass substrate, and a low density is required to reduce the weight of the glass substrate having an increased size. In addition, the glass substrate needs to have high resistance and thermal expansion characteristics due to thermal shock caused by high temperature processing during the manufacturing process of the display, and needs to be required. The composition is substantially free of alkali components such that the glass substrate is uncorrelated with electrical signals from circuitry formed on the substrate.

Therefore, in order to meet the above requirements, the application is based on high levels of cerium oxide. (silica) and boric acid borate glass are essential. However, there is a disadvantage that the borosilicate glass needs to be melted at a higher temperature. This is not only associated with the melting section, but also with all refining sections, agitation sections, and conveying sections prior to placing the molten glass material into the forming apparatus.

In this case, for the molten glass material, in order to maintain it in the transfer zone The quality within the segment, the portion in contact with the glass is made of platinum or a platinum alloy, or in most cases coated with platinum or a platinum alloy. The platinum or platinum alloy has the advantage that the platinum or platinum alloy has few joints, has a smooth surface, and has a significant surface compared to a refractory material that forms a melting furnace. Low material corrosion. However, since the refractory material has a long service life and is inexpensive compared to platinum or a platinum alloy, the refractory material can be used as a material for the conveying section, and for example, the refractory material is disclosed in detail in German patent. The application was published in the early days of DE 10 2009 000 785 A1.

At the same time, in addition to the aforementioned high standard specifications required in the process of manufacturing a glass substrate for a display, the glass substrate of the display requires high optical efficiency due to the performance of products such as televisions and monitors in the field of application of the glass substrate. standard. The high optical standard means not only a state in which bubbles (bubbles or small bubbles), a cord, a knot, and a scratch having a predetermined size or larger are present, but also means There are no such things as striae, ream, And a state of optical distortion such as surface waviness. The optical distortion defect is severe in the case where the glass becomes a heterogeneous glass due to mixing with the heterogeneous glass, and becomes more severe as the thickness of the product decreases. In the case of a flat glass having a thickness of 2 mm or more for a building construction or a vehicle, or in the case of a solar glass having a thickness of 1 mm or more, the optical distortion defect cannot be It is seen by the naked eye, and the typical level of the optical distortion defect is difficult to be regarded as a critical defect in terms of its function. However, in the case of a glass substrate of a display, a typical water criterion of optical distortion defects is considered a fatal defect.

The case of borosilicate glass used in the composition of the display glass The melting process, the refining process, the agitation process, and the transfer process are at a higher temperature than in the case of a flat glass as a thick panel, and this is substantially more advantageous for low molecules in the composition of the boobate glass (eg, , boric acid) volatilization. The low molecular weight volatilization in the composition of the borosilicate glass is mainly performed on the surface of the molten glass material, so the surface glass has less boric acid and abundant cerium oxide and aluminum oxide, thereby making the surface glass in terms of composition. It becomes different from the internal glass material. The thickness of the surface glass having different compositions is related to the glass stagnation time and is approximately several tens of micrometers to several hundreds of micrometers, and even if the surface glass has this thickness level, optical properties may occur when the product is completely formed. Fatal flaws. Further, in the case where the aforementioned surface glass is present, the surface tension is distorted due to the heterogeneous nature of the surface glass itself, and thus there is a problem that the surface waviness of the glass is enlarged, and thus there is unevenness. . Need to be in it In the case where the glass product is subjected to additional processing such as grinding, the time required to process the product may be prolonged, or the above problems may not be completely solved. This mechanical heterogeneity is also considered a fatal defect in borosilicate glass.

In which the melting process, the refining process, the agitation process, and the transfer section are In the case of being disposed in a combustion space or in the presence of a naturally volatilized glass surface, such defects become more serious because the low molecular volatile components constituting the glass component volatilize from the surface of the molten glass to the combustion space and the like. Make small changes in the composition of the surface. In the case where the low molecular volatile component is volatilized and the composition of the surface glass changes slightly before the stirring process, the surface glass is partially mixed with the inner molten glass via a subsequent stirring process, so that the minute change tends to It is reduced to a certain extent, but the minor changes cannot be completely eliminated. Further, in the case where there is a combustion space or a naturally volatilized glass surface in a section after the stirring process (for example, a supply passage or a working end for conveying the glass to the molding apparatus), low molecular weight is volatilized The component is volatilized and inevitably produces a surface glass. Further, in the case of borosilicate glass, it is necessary to maintain a high temperature of 1,200 ° C or higher, so as to maintain a low viscosity even after the stirring process, and in the case where there is a combustion space, the discharge process is performed externally. In order to discharge the combustion gas, and therefore, the partial pressure of the low molecular volatile component in the combustion space is further reduced, thereby being more favorable for volatilization, and there is a thicker surface glass. The molten glass material is conveyed in a laminar flow manner due to high viscosity in the conveying section, and is discharged to the molding process in a state in which the surface glass is not mixed with the internal molten glass, and thus there is the following problem: The manufactured product has a fatal optical distortion Become a defect.

[Prior Art Literature] [Patent Literature]

(Patent Document 1) Korean Patent No. KR1207674 B1

(Patent Document 2) Korean Patent No. KR0496067 B1

The present invention seeks to provide an apparatus and method for producing glass in which a device for producing glass and a method of producing a glass have a low-density volatile molecule such as boric acid, in the case where there is a combustion space or a free-volatility glass surface. The surface glass produced by the volatilization is effectively removed from the surface glass before being placed in the molding apparatus, thereby producing a very homogeneous glass substrate for use in displays in which no optical distortion defects and mechanical surface waviness are present in the product.

An exemplary embodiment of the present invention provides a glass manufacturing apparatus including: a conveying passage for conveying molten glass; a skimmer for picking up a surface glass in the conveying passage And a discharge unit for overflowing the discharged surface glass and discharging the surface glass. The position of the conveying passage is not particularly limited as long as the conveying passage is a passage that exposes the surface of the molten glass when the molten glass moves. For example, the transfer channel can be located in a forehearth, a feeder, and a cooling The passage at any of the districts.

The extractor is mounted on an upper side of the transfer channel, and the discharge sheet The element is mounted on a lateral side of the transfer channel. The extractor is mounted on an upper side of the transfer passage to extract a non-homogeneous glass layer (ie, a surface glass) on an upper side of the transfer passage. It should be noted that the meaning of "selling out" includes the operation of separating the flow of the heterogeneous glass layer on the surface of the molten glass from the main flow of the molten glass, and enabling the heterogeneous glass layer to flow in a desired direction. operating.

The extractor is submerged in the melting from the transfer path The upper surface of the glass faces in the direction of the bottom surface. In this case, the immersion depth with respect to the surface is 5% to 50% of the total depth in the direction from the upper surface to the bottom surface of the molten glass. In this case, it should be noted that the immersion depth (ie, a given depth) of the extractor is determined according to the degree of the heterogeneous layer on the surface of the molten glass, and in some cases may be The immersion depth is adjusted.

A line connecting one end of the extractor to the other end may form a predetermined angle with respect to a surface perpendicular to a direction in which the molten glass moves in the conveying path. Alternatively, one side of the extractor can be configured to be tilted.

The discharge unit is mounted on a lateral side of the conveying passage, and serves as a passage for discharging the surface glass which is taken out and collected at the upper surface of the molten glass moving along the conveying passage to the outside. The discharge unit may include: an outer outlet for discharging the surface glass that is drawn and collected; an overflow inlet for conveying the glass from the lateral side of the conveying passage to the outer outlet; and a discharge pipe Connection office The overflow inlet and the outer outlet are described.

In this case, it can be manufactured from the overflow by modularization as needed. Entrance to the section of the outer outlet, and in this case, it is noted that there are advantages in that, when the position of the discharge unit is changed, when the equipment is changed, etc., the area can be easily attached and detached as needed. segment.

Preferably, the discharge unit may include a backflow prevention member and a heating machine Structure, and orifice. The overflow inlet is an inlet directly formed on the lateral side of the conveying passage, and the surface glass which is scooped out by the dipper and collected on one side flows into the overflow inlet. The object of the present invention will be difficult to achieve if the glass flowing into the discharge conduit from the overflow inlet of the discharge unit is countercurrent and flows back into the transfer passage. In order to prevent the above problem, a backflow prevention member that prevents the glass from flowing backward by using a shape such as a threshold may be attached.

Meanwhile, the apparatus for manufacturing glass according to the present invention may further include a discharge mold And the discharge module may be configured in the form of a tube made of platinum or a platinum alloy, or may be configured in the form of a combustion space to which the combustion element is attached, but is not limited thereto. Additionally, the heating mechanism can be attached to the discharge module to adjust the amount of surface glass collected and discharged to the exterior.

For example, in which the discharge module is made of platinum or platinum alloy In the case of a tube-shaped pipe, a direct heating element using electrical Joule heat can be used as the heating mechanism, and an indirect heating element can also be used as the heating mechanism. Further, in the case where the discharge module has a form of combustion space, it is possible to heat using radiant heat generated by combustion in a burner. The heating element of the molten glass serves as a heating mechanism, but it should be noted that the shape of the heating element is not limited thereto.

The aperture is mounted to an end of the outer outlet and the heating element is attachable To the orifice to adjust the amount of surface glass collected and discharged to the outside. As the heating element, there may be various heating elements such as a direct heating element that heats the molten glass flow conduit by electric Joule heat, or an indirect heating element that heats the molten glass by heat that is burned in a burner installed outside, It should be noted, however, that the heating element is not necessarily limited thereto.

It should be noted that the amount of glass discharged by the discharge unit is based on the flow along the conveying path. The total amount of molten glass to be moved and the immersion depth of the extractor vary, and also vary depending on the degree of surface glass formed on the upper surface of the molten glass.

In this case, it should be noted that the amount of glass to be discharged can be set to Preferably, it is discharged from about 1% to 10% of the total amount of molten glass flowing along the transfer passage, and the heating structure is selected to adjust the amount of the discharged glass. The detailed configuration such as the installation location of the heating mechanism is not particularly limited as long as the heating mechanism can heat the surface glass so that the surface glass that has moved to the discharge unit can be moved or discharged in a molten state.

Meanwhile, the apparatus for manufacturing glass according to the present invention can be melted from glass. The entire process of the Cheng to glass product molding process is installed at any location or at various locations. The step of scooping, collecting, and discharging the surface glass may be repeated at least once or several times depending on the number of devices installed, but it should be noted that the present invention is not limited thereto.

Another exemplary embodiment of the present invention provides a method of manufacturing glass a method comprising: moving a molten glass to a transfer passage; scooping out a surface glass of the molten glass by means of an extractor mounted on an upper side of the transfer passage; and causing the surface glass to be scooped by the extractor The overflow is discharged to the discharge unit.

In addition, it should be noted that the apparatus for manufacturing glass according to the present invention is utilized. The method for manufacturing the glass may be, but not particularly limited to, for example, a float process, a redraw process, a slot down-draw process, and an overflow pull-down process (overflow). Any of the down-draw processes).

Preferably, the method of manufacturing a glass according to the present invention may further comprise: cooling the molten glass that is not ejected by the extractor.

Preferably, the method of manufacturing a glass according to the present invention may further comprise: heating the surface glass discharged by the discharge unit.

Meanwhile, the shape of the glass manufactured by the apparatus and method for manufacturing glass according to the present invention is not particularly limited, but may be, for example, a plate shape or a panel shape. The panel-shaped glass manufactured by the apparatus and method for manufacturing glass according to the present invention has excellent flatness. Further, the panel-shaped glass manufactured by the apparatus and method for manufacturing glass according to the present invention has an advantage that the panel-shaped glass does not have optical distortion defects (waves) or the optical distortion defects are reduced. The reason is that the portion where the physical and chemical composition and properties are changed due to surface exposure during the glass manufacturing method is effectively extracted, discharged, and removed.

The glass according to the present invention may have a surface of from 0.01 micron to 0.07 micron Waviness. In this case, the glass has a low surface waviness, and therefore, the glass has excellent flatness. Specifically, the glass may have a surface waviness of from 0.01 micrometers to 0.06 micrometers.

In this case, since the glass has a low surface waviness, The glass is suitable for stacking microcircuits and patterns on a substrate, and is suitable for use as a glass substrate for large-sized display elements. In this case, the glass according to the present invention may be a borosilicate glass, and in this case, the influence on the glass surface due to volatilization of boric acid is reduced, and thus the surface waviness is lowered. The borosilicate glass is referred to as bismuth glass containing boric acid, and the content of boric acid may be, but not limited to, 5% to 15% based on the total weight of the borosilicate glass.

Also, the present invention provides, but is not limited to, glass for display elements. Said The display component can be a plasma display panel (PDP), a light emitting diode (LED), an organic light emitting diode (OLED), or a liquid crystal display (LCD). Any of a thin film transistor-liquid crystal display (TFT-LCD) and a cathode ray tube (CRT).

The present invention may be in the case where there is a combustion space or a free volatile glass surface when the glass is produced, before the surface glass produced by volatilization of low-density volatile molecules such as boric acid is put into the molding apparatus, the removal is performed. Surface glass, which in turn produces a very homogeneous glass substrate for use in the absence of light in the product A display that learns distortion defects and mechanical surface waviness.

Specifically, using the apparatus and method for manufacturing glass according to the present invention The panel-shaped glass is made to have excellent flatness. Further, the panel-shaped glass manufactured by the apparatus and method for manufacturing glass according to the present invention has an advantage that the panel-shaped glass does not have optical distortion defects (waves) or the optical distortion defects are reduced.

1‧‧‧ molten glass

2‧‧‧Virtual line

3‧‧‧Virtual surface

4‧‧‧ upper surface

10, 10’‧‧‧Transportation channel

20‧‧‧Exporter

30‧‧‧Draining unit

31‧‧‧External exit

32‧‧‧ overflow entrance

33‧‧‧Drainage pipe

40‧‧‧Draining module

50‧‧‧heating mechanism

D1‧‧‧ immersion depth

D2‧‧‧ total depth

R‧‧‧ angle

FIG. 1 is a perspective view of a device 100 for fabricating a glass in accordance with an exemplary embodiment of the present invention.

2 is a cross-sectional view of a device 100 for making glass in accordance with an exemplary embodiment of the present invention.

FIG. 3 is a top plan view of an apparatus 100 for making glass in accordance with an exemplary embodiment of the present invention.

The invention will be described in detail below with reference to the drawings and exemplary embodiments. the following The exemplified embodiments are intended to be illustrative of the invention, and the scope of the invention is intended to be included in the scope of the appended claims.

1 is a device for manufacturing glass according to an exemplary embodiment of the present invention. A perspective view of 100. 2 is a cross-sectional view of a device 100 for making glass in accordance with an exemplary embodiment of the present invention. FIG. 3 is a top plan view of an apparatus 100 for making glass in accordance with an exemplary embodiment of the present invention. Hereinafter, an apparatus 100 for manufacturing a glass according to an exemplary embodiment of the present invention will be explained with reference to FIGS. 1 through 3.

The molten glass 1 flows along the transfer passage 10, and the extractor 20 is mounted on the transfer The upper side of the passage 10, and the discharge unit 30 is disposed on the lateral side of the conveying passage 10. The upper surface of the molten glass 1 flowing along the conveying passage 10 is a heterogeneous component region caused by volatilization of the volatile material, and the upper surface of the molten glass 1 is guided to the discharge unit 30 by the mounted ejector 20, and then discharged Element 40 is discharged downward. With this configuration, the composition of the surface of the molten glass in the conveying path 10' after the discharge unit 30 (i.e., after the ejector 20) is the same as the composition of the inner molten glass.

The extractor 20 is immersed in the molten glass that has moved from the transport path 10 The surface faces in the direction of the bottom surface. Referring to Fig. 2, the immersion depth D1 at which the extractor 20 is immersed with respect to the surface of the molten glass is 5% to 50% of the total depth D2 in the direction from the upper surface to the bottom surface of the molten glass. For example, in the case where the vertical depth from the surface to the bottom surface of the molten glass in the conveying passage 10 is 500 mm, the depth of 5% means a vertical depth of 25 mm with respect to the surface of the molten glass.

That is, preferably, the extractor 20 is configured to be at a depth of 5% to 50% of the total depth of the molten glass with respect to the surface of the molten glass.

The reason is that in the case where the immersion depth is less than 5% of the total depth, although the flow of the heterogeneous glass layer is blocked by the ejector 20, a part of the heterogeneous glass layer on the surface of the molten glass is discharged as it is to Transfer channel 10' The placement in the rear end region is such that the extractor 20 is not practically effective for effectively removing the heterogeneous glass layer on the surface of the molten glass. In addition, in the case where the immersion depth is equal to or greater than 50% of the total depth, the shape of the ejector 20 is deformed by the pressure caused by the flow of the molten glass, which may cause a disadvantage that the life of the ejector 20 is shortened.

Meanwhile, the immersion depth is based on the unevenness on the surface of the molten glass 1. The degree of the layer is determined, and it should be noted that the immersion depth can be adjusted in some cases.

In addition, referring to Figures 1 and 2, the discharge duct 33 of the discharge unit 30 is It is set to be located at a portion higher than the immersion depth D1 of the ejector 20. That is, there is a step having a predetermined height between the extractor 20 and the discharge duct 33, and therefore, the molten glass 1 can be mounted on the upper surface (surface glass portion) of the molten glass 1 flowing along the conveying passage 10. The extractor 20 is guided to the discharge unit 30, and then the surface glass can be efficiently discharged.

The virtual line 2 of one end of the extractor 20 and the other end of the extractor 20 An angle between greater than 0° and less than 90° may be formed with respect to the virtual surface 3 perpendicular to the direction in which the molten glass moves along the conveying passage 10. Specifically, the angle R between the virtual surface 3 perpendicular to the direction in which the molten glass moves and the imaginary line 2 connecting the one end of the extractor 20 and the other end is more preferably 30 to 60.

The reason is that in the case where the angle R is less than 30°, by moving The mechanical load applied to the extractor 20 by the molten glass is increased, so that the shape of the extractor 20 may be deformed and it is difficult to efficiently discharge the surface glass. And in the case where the angle R is equal to or greater than 60°, the length of the ejector 20 is unnecessarily increased, so that the manufacturing cost of the ejector 20 is increased.

At the same time, the thickness of the extractor 20 can be from 0.5 mm to 10 mm. along with As the thickness becomes larger, the extractor can better withstand the mechanical load applied to the extractor by the moving molten glass. Specifically, the thickness of the extractor 20 can be from 0.7 mm to 2 mm. In this case, the extractor 20 can withstand the mechanical load applied to the extractor 20 by the moving molten glass, and can reduce the cost required to manufacture the extractor 20.

The extractor 20 can be selected based on the temperature at the mounting point of the extractor 20 The material, and the material is not particularly limited as long as the material is a metal or refractory material having mechanical strength at a temperature of 1,000 ° C or higher, specifically, 1,300 ° C to 1,400 ° C. For example, the material of the extractor may include one or more of a metal, a cermet, and a ceramic having a melting point of 1,400 ° C or higher than 1,400 ° C.

The metal may be, but not limited to, gold, silver, platinum, rhodium, titanium, vanadium, chromium, Any of manganese, iron, cobalt, nickel, copper, zinc, aluminum, gallium, tin, antimony, indium, and alloys thereof. The ceramic may be, but not limited to, a ceramic made by grinding and utilizing natural primary minerals present in nature, or a ceramic made of a material refined in high purity. For example, the material can be, but is not limited to, any of tantalum nitride, hydrocarbons, sialon, and zirconia. The cermet is not particularly limited as long as the cermet is a hard one having improved heat resistance by dispersing a metal oxide, carbide, telluride, boride or the like into a metal base material. The material is fine. Specifically, the extractor 20 is preferably a base made of any one of platinum, platinum alloy, and enhanced platinum. A metal extractor or a dipper made of refractory bricks having a high zircon content.

In addition, a combination of metal-based materials and refractory bricks can be utilized, and here In one case, the surface of the refractory brick in direct contact with the glass may be lined with any of platinum, platinum alloy, and reinforced platinum based metal based materials. The shape of the ejector 20 is not particularly limited as long as the ejector 20 can be mounted on the upper side of the conveying passage and the upper portion of the moving molten glass can be taken out. It is to be noted that the shape of the cross section of the ejector 20 may be, but not limited to, a curved shape, a linear shape, a curved straight shape, or the like.

The discharge unit 30 serves to overflow and discharge the surface glass thrown out by the extractor 20.

Specifically, the discharge unit 30 may include: an outer outlet 31 for discharging the surface glass to the outside; an overflow inlet 32 formed on a lateral side of the conveying passage 10 and for conveying the surface glass to the outer outlet 31; And a discharge duct 33 connecting the outer outlet 31 and the overflow inlet 32.

In this case, if the surface glass that has flowed once into the discharge duct 30 flows back into the conveying passage 10, the object of the present invention will be difficult to achieve. In order to prevent the above problem, a backflow prevention member (not shown) may be provided in the discharge duct 33, which prevents the surface glass from flowing backward by a shape such as a threshold.

Meanwhile, it is to be noted that the discharge unit 30 may further include an orifice that is attached to the end of the outer outlet 31 and discharges the collected surface glass to the outside. The orifice is a hole for fluid to flow out and uses well-known technical components and will not be described again.

The glass introduced into the discharge unit 30 is discharged via the discharge module 40 To the outside. The discharge module 40 can include a heating mechanism 50.

The discharge module 40 can be fabricated in the form of a tube made of platinum or a platinum alloy. Or it may be made into a combustion space form in which a combustion element to which a burner is attached, but is not limited thereto. In the case where the molten glass passes through the discharge module 40, when the temperature is lowered, the viscosity rapidly increases and the fluidity is seriously deteriorated, and there is a concern that in some cases, the flow of the glass will be in the discharge module 40. Stopped and the glass will not be discharged. Therefore, to prevent the above problems, the discharge module 40 includes a suitable heating mechanism 50. The amount of glass discharged to the outside via the discharge module 40 can be adjusted by the heating mechanism 50, and the heating mechanism 50 is also used to adjust the amount of glass discharged through the discharge unit 30.

The discharge module 40' can be manufactured by modularization as needed and in this case Among them, there are the following advantages: when the position of the discharge unit 30 is changed, when the discharge unit 30 is replaced due to equipment failure, etc., the discharge module 40 can be easily attached and detached as needed.

The amount of glass discharged by the discharge module 40 is based on the along the conveying path The total amount of 10 molten glass, the immersion depth of the ejector 20, and the degree of surface glass formed on the upper surface of the molten glass vary. In general, preferably, the discharge module 40 is manufactured such that the molten glass can be discharged in an amount of 1% to 20% of the total amount of the molten glass flowing along the conveying passage 10. More preferably, the discharge module 40 is fabricated such that the molten glass can be discharged in an amount of from 1% to 10% of the total amount of molten glass flowing along the conveying passage 10, and preferably, the heating element can be selected so that The amount of molten glass discharged is adjusted.

In this case, it is necessary to pay attention to, for example, the installation location of the heating mechanism 50. The detailed configuration is not particularly limited as long as the heating mechanism 50 can heat the molten glass so that the molten glass that has moved to the discharge unit 30 can be moved or discharged in a molten state.

A method of making a glass according to the present invention includes: subjecting molten glass along The conveying passage moves; the surface glass of the molten glass is scooped out by means of an extractor mounted on the upper side of the conveying passage; and the surface glass thrown out by the purging device is overflowed and discharged to the discharge unit.

Here, it should be noted that the method of manufacturing glass using the apparatus for manufacturing glass according to the present invention may be, but not particularly limited to, for example, a float process, a re-draw process, a slit pull-down process, and an overflow pull-down process. One.

Preferably, the method of manufacturing glass according to the present invention may further comprise: cooling the molten glass that is not scooped out by the extractor.

Preferably, the method of manufacturing a glass according to the present invention may further comprise: heating the surface glass discharged by the discharge unit.

The amount of glass discharged to the outside can be adjusted by heating the discharged surface glass, and the heating step is also used to adjust the amount of glass discharged through the discharge unit.

Meanwhile, the shape of the glass produced by the apparatus and method for manufacturing glass according to the present invention is not particularly limited, but may be, for example, a plate shape or a panel shape. The panel-shaped glass manufactured by the apparatus and method for manufacturing glass according to the present invention has excellent flatness. In addition, the apparatus and the party for manufacturing glass according to the present invention are utilized. The panel-shaped glass produced by the method has the advantage that the panel-shaped glass does not have optical distortion defects (waves) or the optical distortion defects are reduced. The reason is that the portion of the physical and chemical composition and properties that has changed due to surface exposure during the glass manufacturing process is effectively extracted, discharged, and removed.

The glass according to the present invention may have a surface of from 0.01 micron to 0.07 micron Waviness. In this case, the glass has a low surface waviness, and therefore, the glass has excellent flatness. Specifically, the glass may have a surface waviness of from 0.01 micrometers to 0.06 micrometers.

In this case, since the glass has a low surface waviness, The glass is suitable for stacking microcircuits and patterns on a substrate, and is suitable for use as a glass substrate for large-sized display elements. In this case, the glass according to the present invention may be a borosilicate glass, and in this case, the influence on the surface of the glass due to volatilization of boric acid is reduced, and thus, the surface waviness is lowered. The borosilicate glass is referred to as bismuth glass containing boric acid, and the content of boric acid may be, but not limited to, 5% to 15% based on the total weight of the borosilicate glass.

At the same time, the invention provides, but is not limited to, glass for display elements. The display The components may be a plasma display panel (PDP), a light emitting diode (LED), an organic light emitting diode (OLED), a liquid crystal display (LCD), a thin film transistor liquid crystal display (TFT-LCD), and a cathode ray tube ( Any of CRT).

<Experimental example>

The apparatus 100 for manufacturing glass using the aforementioned configuration and the method of manufacturing the glass by the method of manufacturing the glass can be clearly seen from the following experimental examples. Law and its effects.

First, each borosilicate glass material is combined. This means that the respective raw materials are combined so that the glass has a composition based on SiO ₂ -Al ₂ O ₃ -B ₂ O ₃ -RO. Specifically, the glass contains 58% to 65% of SiO ₂ , 6% to 10.5% of B ₂ O ₃ , 14% to 25% of Al ₂ O ₃ , and 0 to 3% of MgO by mass percentage. 0 to 9% of CaO, 3% to 8% of BaO (here, 8% to 18% of MgO+CaO+BaO) and 0 to 2% of ZnO, and substantially no base.

The combined glass raw material is placed in a furnace and then melted, and the completely molten glass is introduced into the transfer passage 10. The extractor 20 is mounted at the transfer channel 10, the immersion depth D1 is 30% of the depth D2, and the extractor 20 is immersed at a depth of about 150 mm. The upper surface 4 of the glass is high enough to discharge the glass to the discharge unit 30, and therefore, the portion of the glass that is ejected by the extractor 20, particularly the surface glass, can be sufficiently discharged. The molten glass flowing through the transfer passage 10' after the ejector 20 flows into a float bath (not shown) and is then formed into a glass substrate of the display by an appropriate method at an appropriate temperature.

The optical distortion defect level is first tested with the inspector's naked eye, and this test is called the stress test. For the wave stress test, the formed glass substrate was cut into a size having a horizontal length and a vertical length of 600 mm, respectively, and then the test was performed. For the test, 20 samples were measured, and the position and time at which the samples were taken were randomly set to improve the accuracy of the measurement. The rib test is a qualitative method for testing optical distortion defects on the surface of a glass substrate. The ribs mean whether a stripe pattern is present when light is projected onto the glass substrate, and typically, the glass of the display The glass substrate must have no ribs.

As a qualitative test method for testing optical distortion defects, the surface was also performed Measurement of waviness. For the surface waviness test, the formed glass substrate was cut into a size having a horizontal length and a vertical length of 100 mm, respectively, and then the test was performed. In order to improve the accuracy of the test, 20 samples were measured, and the position and time at which the samples were taken were randomly set to improve the accuracy of the measurement. The measurements were made using a Surfcom device. The Surfcom device is a device that performs a physical scan of a 100 mm segment of a surface of a glass substrate and measures surface waviness. The measurement results are shown in Table 1 below.

<Comparative example>

A comparative example was used to verify the effect of the present invention. The combination of the respective borosilicate glass materials was carried out in the same manner as in the above experimental examples, and after the glass materials were completely melted, the molten glass was introduced to the transfer passage 10. In this case, the extractor is removed in advance. Therefore, the surface glass on the upper side of the molten glass flowing along the conveying path 10 is not discharged to the outside via the discharge unit 30 and the discharge module 40. The molten glass flows into a float bath (not shown), and is formed into a glass substrate for a display by an appropriate method at an appropriate temperature in the same manner as the experimental example.

In order to measure the optical distortion defect level of the glass substrate manufactured by the above method, the measurement of the ribs and the measurement of the surface waviness were performed. The measurement results are shown in Table 1 below.

[Table 1]

As shown in Table 1, it was confirmed that in the case of the glass substrate produced by the apparatus and method for producing glass according to the present invention, optical distortion defects which occur due to volatilization of the surface glass on the upper side of the molten glass are remarkably reduced.

That is, according to the present invention, before the surface glass produced by volatilization of low-density volatile molecules such as boric acid is put into the molding apparatus, the surface glass is removed by the extractor, thereby producing a very homogeneous glass. The substrate is used in displays where there are no optical distortion defects and mechanical surface waviness in the product.

1‧‧‧ molten glass

10, 10’‧‧‧Transportation channel

20‧‧‧Exporter

31‧‧‧External exit

32‧‧‧ overflow entrance

33‧‧‧Drainage pipe

40‧‧‧Draining module

50‧‧‧heating mechanism

Claims (20)

A glass manufacturing apparatus comprising: a conveying passage in which molten glass is conveyed; a skimmer for picking up a surface glass of the molten glass conveyed in the conveying passage; and discharging And a unit for overflowing the surface glass thrown out by the extractor and discharging the surface glass. The apparatus for manufacturing a glass according to claim 1, wherein the conveying passage is a passage located at any of a forehearth, a feeder, and a cooling zone. The apparatus for manufacturing a glass according to claim 1 or 2, wherein the extractor is disposed on an upper side of the transfer passage, and the discharge unit is disposed on a lateral side of the transfer passage (lateral Side). The apparatus for manufacturing a glass according to claim 3, wherein the extractor is disposed at a depth of 5% to 50% of a total depth of the molten glass with respect to a surface of the molten glass. The apparatus for manufacturing a glass according to claim 3, wherein the extractor is configured to incline one side of the extractor or to connect a line connecting one end of the extractor to the other end The surface perpendicular to the direction in which the molten glass moves in the conveying passage is maintained at a predetermined angle. The apparatus for manufacturing a glass according to claim 5, wherein the predetermined angle is in a range of more than 30° to 60° or less than 60°. The apparatus for manufacturing a glass according to claim 1, wherein the discharge unit comprises: an outer outlet that discharges the surface glass to the outside; and an overflow inlet formed on a lateral side of the conveying passage and The surface glass is conveyed to the outer outlet; and a discharge conduit connecting the outer outlet and the overflow inlet. The apparatus for manufacturing a glass according to claim 7, wherein the discharge unit further includes a backflow prevention member located in the discharge duct and preventing the surface glass that is thrown out from flowing back to The transfer channel. The apparatus for manufacturing a glass according to claim 7, further comprising: a discharge module configured to be in the form of a tube made of platinum or a platinum alloy, or configured to be in the form of a combustion space, wherein the combustion element is attached to The combustion space. The apparatus for manufacturing a glass according to claim 7, wherein the discharge unit further includes an orifice that is attached to one end of the outer outlet and discharges the collected surface glass to the outside. The apparatus for manufacturing a glass according to claim 9 or claim 10, wherein the heating mechanism is disposed on at least one of the discharge module and the orifice, and the pair of heating mechanism is located in the discharge mode The set is heated with the surface glass in at least one of the apertures. The glass manufacturing apparatus according to claim 1, wherein the surface glass discharged through the discharge unit is 1% to 10% of the molten glass conveyed in the conveying passage. A method of manufacturing a glass, comprising: moving a molten glass to a conveying passage; scooping out a surface glass of the molten glass by an extractor mounted on an upper side of the conveying passage; and causing the ejecting device to be scooped out The surface glass overflows and is discharged to the discharge unit. The method of producing a glass according to claim 13, wherein the transfer passage is a passage located at any of a front furnace, a feeder, and a cooling zone. The method of producing a glass according to claim 13, wherein the extractor is disposed at a depth of 5% to 50% of a total depth of the molten glass with respect to a surface of the molten glass. The method for producing a glass according to claim 13, further comprising: cooling the molten glass that is not scooped out by the extractor. The method for producing a glass according to claim 13, further comprising: heating the surface glass discharged by the discharge unit. A glass produced by the method for producing a glass according to any one of claims 13 to 18, which has a surface waviness of from 0.01 μm to 0.07 μm. The glass of claim 18, wherein the glass The material is borosilicate glass. A display element comprising the glass of claim 18 of the patent application.