Disclosed a cover glass and a glass composition that has higher Specific Strengthening Performance Factor (SSPF). The SSPF is defined as (Young's Modulus)/(Density * Coefficients of Linear Thermal Expansion (CTE) * Annealing Point). The SSPF is ion-exchangeable and is in a range from 6 Gm2/s2to 12 Gm2/s2, making the glass relatively faster to strengthen by performing single and/or multiple ion exchanges. A depth of layer (DOL) greater than 20 microns and a compressive stress (CS) greater than 600 MPa (for cover glass thickness of 300 microns and more) and DOL greater than 5 microns and the CS greater than 300 MPa (for cover glass thickness of 300 microns and less) are reached in short time after performing single and/or multiple ion exchanges. The glass composition is well suited for single and/or multiple ion exchanges, resulting in better service durability and high sharp impact strength.
3+SrO+BaO) is less than 42%, the devitrification temperature is 1260° C. or lower, and the strain point is 720° C. or higher. This method for producing said glass substrate for a display comprises: a melting step for melting, by using at least direct electrical heating, a glass material prepared to have a predetermined composition; a forming step for forming, into a flat glass sheet, the molten glass that has been melted in the melting step; and an annealing step for annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled so as to reduce the heat shrinkage rate of the flat glass sheet.
H01L 27/12 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
C03B 25/08 - Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
G02F 1/1368 - Active matrix addressed cells in which the switching element is a three-electrode device
H01L 27/32 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including components using organic materials as the active part, or using a combination of organic materials with other materials as the active part with components specially adapted for light emission, e.g. flat-panel displays using organic light-emitting diodes
3.
Glass substrate for display and method for producing same
3, wherein 3×BaO/(MgO+CaO+SrO) is 5 or less, MgO/(CaO+SrO) is 0.36 or greater, the devitrification temperature is 1235° C. or lower, and the strain point is 700° C. or higher. The method comprises: melting, by using at least direct electrical heating, a glass material prepared to have a predetermined composition; forming, into a flat glass sheet, the molten glass that has been melted in the melting step; and annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled so as to reduce the heat shrinkage rate of the flat glass sheet.
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03C 3/093 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium containing zinc or zirconium
C03B 25/04 - Annealing glass products in a continuous way
C03B 25/08 - Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
G02F 1/1368 - Active matrix addressed cells in which the switching element is a three-electrode device
A method for manufacturing a glass substrate comprises a surface processing step of performing surface processing for forming unevenness on a glass surface. In the surface processing step, protruded portions having a height of 1nm or more from an average line of a roughness curve are dispersedly formed on the glass surface. In the surface processing step, the surface processing is performed such that a protruded portion area ratio is 0.5 to 10%. The protruded portion area ratio is a ratio of an area of the protruded portions with respect to an area of any rectangular region. The rectangular region has a square shape with a side length of 1 μm. In the surface processing step, in a case where the rectangular region is equally divided into at least one hundred divided regions having a square shape, the surface processing is performed such that a protruded portion content ratio is 80% or more. The protruded portion content ratio is a ratio of the number of divided regions having the protruded portions with respect to the number of divided regions included in the rectangular region.
H01L 29/10 - Semiconductor bodies characterised by the shapes, relative sizes, or dispositions of the semiconductor regions with semiconductor regions connected to an electrode not carrying current to be rectified, amplified, or switched and such electrode being part of a semiconductor device which comprises three or more electrodes
H01L 27/12 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
H01L 29/423 - Electrodes characterised by their shape, relative sizes or dispositions not carrying the current to be rectified, amplified or switched
AVANSTRATE TAIWAN INC. (Taiwan, Province of China)
Inventor
Gekko Hitoshi
Abstract
When producing a glass substrate, after causing molten glass that has overflowed from the upper section of a molded body in the upper space of a molding furnace chamber that has been heated to flow down along both side surfaces of the molded body, the molten glass is caused to merge at the lower end of the molded body to create sheet glass to be conveyed, and thereafter, the sheet glass is cooled. At such time, the molten glass or the sheet glass is blocked from receiving heat from the upper space in parts with a shielding member in the width direction which is orthogonal to the conveyance direction of the molten glass or the glass sheet, thereby adjusting the temperature distribution of the molten glass or the sheet glass in the width direction.
When manufacturing a display glass substrate with a low thermal contraction coefficient, a sheet glass formed by a forming process is cooled until the temperature of a central portion thereof in a width direction reaches 300°C. In doing so, the average cooling speed of a central region, which is inside the sheet glass in the width direction compared to both end parts of the sheet glass in the width direction and is a region including the central portion, in a temperature region of the central portion of less than 450°C to 300°C or higher is slower than the average cooling speed of the central region in a temperature region other than the above temperature region during the cooling process.
Provided are: a glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing said glass substrate. This glass substrate for a display is made of a glass comprising SiO2 and Al2O3, comprising 0% or more to less than 3% B2O3 and from 5 to 14% BaO as expressed in mass%, and substantially comprising no Sb2O3, wherein the devitrification temperature is 1235°C or lower and the strain point is 720°C or higher. Alternatively, this glass substrate for a display is made of a glass comprising SiO2 and Al2O3, comprising 0% or more to less than 3% B2O3, 1.8% or more MgO, and from 5 to 14% BaO as expressed in mass%, and substantially comprising no Sb2O3, wherein (SiO2+MgO+CaO)-(Al2O3+SrO+BaO) is less than 42%, the devitrification temperature is 1260°C or lower, and the strain point is 720°C or higher. This method for producing said glass substrate for a display comprises: a melting step for melting, by using at least direct ohmic heating, a glass material prepared to have a predetermined composition; a molding step for molding, into a flat glass sheet, the molten glass that has been melted in the melting step; and an annealing step for annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled such that the heat shrinkage rate of the flat glass sheet is reduced.
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
8.
GLASS SUBSTRATE PRODUCTION METHOD AND GLASS SUBSTRATE PRODUCTION DEVICE
AVANSTRATE TAIWAN INC. (Taiwan, Province of China)
Inventor
Fujimoto Shingo
Mizuno Masashi
Abstract
Provided is a glass substrate production method whereby bubbles included in a glass substrate can be effectively reduced. The method comprises production steps including: a melting step for at least generating, stirring, or fining molten glass; and a molding step for molding a glass sheet from the molten glass. This method further comprises: an analysis step for analyzing gas components in bubbles included in the glass plate; a determination step for determining, in accordance with the result of the analysis, a group to which the analyzed bubbles belong, from among a plurality of groups prepared in advance according to composition ratios of a plurality of gas components that may be included in the bubbles; and an identification step for identifying a cause of the bubbles on the basis of the result of the determination. This method for producing glass substrates is characterized in that the production steps are adjusted with feedback, by using a bubble reduction method associated in advance with the determined group, so as the suppress the cause and reduce the number of bubbles, on the basis of the result of the identification.
Provided are: a glass substrate that achieves a high strain point while having a low devitrification temperature; and a method for producing said glass substrate. This glass substrate for a display is made of a glass comprising SiO2 and Al2O3, comprising 0% or more to less than 4% B2O3 as expressed in mass%, and substantially comprising no Sb2O3, wherein 3×BaO/(MgO+CaO+SrO) is 5 or less, MgO/(CaO+SrO) is 0.36 or greater, the devitrification temperature is 1235°C or lower, and the strain point is 700°C or higher. This method for producing said glass substrate for a display comprises: a melting step for melting, by using at least direct ohmic heating, a glass material prepared to have a predetermined composition; a molding step for molding, into a flat glass sheet, the molten glass that has been melted in the melting step; and an annealing step for annealing the flat glass sheet, wherein a condition for cooling the flat glass sheet is controlled such that the heat shrinkage rate of the flat glass sheet is reduced.
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03B 25/04 - Annealing glass products in a continuous way
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
The purpose of the present invention is to provide a glass-substrate manufacturing method with which it is possible to reduce the plate-thickness deviation of a glass substrate. The glass- substrate manufacturing method includes: a molding step; a transporting step; an acquiring step; and a controlling step. In the molding step, molten glass is supplied to a supply groove that is formed on a top surface of a molding body, the molten glass that has overflowed from the supply groove is made to flow down along both of the side surfaces of the molding body, the molten glass that has flowed down along both of the side surfaces is made to join at the bottom end of the molding body, and thus, a glass ribbon is molded. In the transporting step, the glass ribbon is slowly cooled while being transported downward. In the acquiring step, shape data related to the shape of the molding body are acquired. In the controlling step, the temperature profile is controlled on the basis of the shape data by using a temperature-adjusting means installed above the molding body so that the plate-thickness deviation in the width direction of the glass ribbon is reduced. The temperature profile is a profile in the longitudinal direction of the supply groove of the molding body for the temperature of molten glass that comes into contact with the top surface of the molding body.
The purpose of the present invention is to provide a method for manufacturing a glass substrate which is capable of efficiently improving the cleanliness of the surfaces of the glass substrate. This method for manufacturing a glass substrate comprises: a cutting step of cutting the glass substrate; an edge machining step of machining cut edges which are cut surfaces of the glass substrate cut in the cutting step; and a surface treatment step of treating the main surface of the glass substrate cut in the cutting step. In the edge machining step, the shape of the cut edges is machined while a grinding fluid is fed to the cut edges. In the surface treatment step, an alkaline solution having a pH of less than 10 is applied onto the main surface, and the surface treatment step is performed at the same time as the edge machining step.
C03C 19/00 - Surface treatment of glass, not in the form of fibres or filaments, by mechanical means
B08B 3/08 - Cleaning involving contact with liquid the liquid having chemical or dissolving effect
B24B 7/24 - Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfacesAccessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
B24B 9/00 - Machines or devices designed for grinding edges or bevels on work or for removing burrsAccessories therefor
B24B 9/10 - Machines or devices designed for grinding edges or bevels on work or for removing burrsAccessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
C03C 15/00 - Surface treatment of glass, not in the form of fibres or filaments, by etching
C03C 23/00 - Other surface treatment of glass not in the form of fibres or filaments
12.
MANUFACTURING METHOD FOR GLASS PLATE AND MANUFACTURING APPARATUS FOR GLASS PLATE
AVANSTRATE TAIWAN INC. (Taiwan, Province of China)
Inventor
Nakashima Kimihiko
Abstract
This manufacturing method is provided with: a forming step in which a glass plate is formed by flowing down molten glass from a forming body; and a cooling step in which the glass plate is cooled by using a heater which is controlled such that the temperature of the glass plate sequentially decreases in the transfer direction of the glass plate while the glass plate formed in the forming step is transferred downwards by means of a pair of rollers which are disposed under the forming body. In the cooling step, the pair of rollers hold the glass plate while being cooled such that thermal deformation is suppressed, and the heater is controlled such that the temperature of a region of the glass plate cooled by the pair of rollers becomes uniform in the widthwise direction of the glass plate.
Provided are a method for manufacturing a glass substrate, and the like, the method being capable of preventing end portions of sheet glass from separating and preventing shrinkage in a width direction of the sheet glass. The present invention is a method for manufacturing a glass substrate by overflowing molten glass from a molded body by a down-draw method and molding sheet glass. The sheet glass has a widthwise central region sandwiched between end portions in the width direction, and a pair of rollers are provided so as to be in contact with the end portions in a position opposing the end portions having a thickness greater than the plate thickness of the widthwise central region. A first cooling speed for cooling the end portions upstream of the pair of rollers from a lower end of the molded body is slower than a second cooling speed for cooling the end portions downstream of the pair of rollers in a temperature region in which the temperature of the widthwise central region is at an annealing point or higher.
A process for producing a sheet glass which includes a forming step in which a molten glass is formed into a sheet glass, a cooling step in which the formed sheet glass is annealed to thereby form a sheet glass having a degree of heat shrinkage of 35 ppm or less, and a reannealing step in which the annealed sheet glass is subjected to a heat treatment in which the sheet glass is reheated and thereafter annealed, thereby reducing the degree of heat shrinkage to 10 ppm or less, wherein the heat treatment is conducted at a temperature lower by at least 70°C than the strain point of the sheet glass.
The glass substrate manufacturing method according to the present invention, whereby distortion is less prone to occur in a glass substrate and unevenness of the principal surface of a glass substrate is less prone to form, is provided with: a molten glass treatment step in which, when molten glass is treated in a glass treatment device in which a gas-phase space is formed by introduction of the molten glass and at least a portion of a wall of the glass treatment device is made of a platinum-group metal, aggregates of platinum-group metal volatile matter volatilized from a wall of the glass treatment device and present in the gas-phase space mix into the molten glass as foreign matter; and an aggregate treatment step for reducing the size of the aggregates so that the ratio of the number of aggregates having a maximum length of 50 µm or less among the aggregates mixed into the molten glass in the molten glass treatment step is at least 70%. The total volume of the glass substrate in the glass substrate layered body according to the present invention is at least 0.1 m3, and the ratio of the number of aggregates having a maximum length of 50 µm or less among all platinum-group metal aggregates included in the glass substrate is at least 70%.
A method for manufacturing a glass plate by a downflow method, the method provided with a forming step for forming molten glass into a sheet-shaped glass plate, and an annealing step for annealing the glass sheet formed in the forming step using a plurality of heaters in an annealing space surrounded by furnace walls, the heaters for controlling the temperature in the annealing space, while conveying the glass sheet vertically downward. In the annealing step, the amount of retained head retained by the glass plate is determined together with the amount of heat in the annealing space using the amount of heat generated by the heaters, the distortion of the glass plate is determined on the basis of a pre-established relationship between the amount of retained heat and the distortion of the glass plate, and the amount of heat from the heaters is controlled, and the amount of retained heat in the glass plate is thereby corrected, and distortion of the glass plate is suppressed.
As a flat panel display glass substrate having a high contrast, the present invention uses a glass substrate that has: an internal defect, which does not have translucency, and which has a long-side length longer than 50 μm, and a short-side length shorter than 5 μm; and a protruding section, which is at a position on a main surface of the glass substrate, said position corresponding to the position of the internal defect, and which has a height shorter than 0.15 μm from the main surface.
G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
G09F 9/00 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
18.
GLASS PLATE PRODUCTION METHOD AND GLASS PLATE PRODUCTION DEVICE
The present invention comprises: a formation step for forming a glass plate from molten glass using a downdraw method; a cooling step for cooling the glass plate formed in the formation step while transporting the glass plate downward in the vertical direction; a detection step for detecting the position of striae occurring in the transport direction of the glass plate cooled in the cooling step and detecting the degree of variation due to the striae; and a determination step for determining the position of striae for which the degree of variation detected in the detection step is equal to or greater than a reference amount. In the cooling step, the amount of heat retained by the glass plate is controlled in a compartment surrounded by a furnace wall so that the degree of variation at the striae positions determined during the determination step is equal to or less than the reference value.
A glass-substrate manufacturing method which includes a forming step and a cooling step. In the forming step, a molten glass is formed into a sheet glass by a down-draw process. In the cooling step, the sheet glass is cooled. The cooling step includes first, second and third coating steps as defined herein.
C03B 25/12 - Annealing glass products in a continuous way with vertical displacement of the glass products of glass sheets
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
3)/RO is equal to or greater than 5. A related method involves melting glass raw materials blended to provide the glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
This glass treatment device has molten glass flow therethrough and processes said molten glass, the inner wall thereof at least partially comprising a material containing a platinum-group metal, and is constituted in such a manner that a gas-phase space is formed in the interior by the surface of the molten glass and the inner wall. The gas-phase space is formed along the direction of flow of the molten glass. When processing the molten glass, on the wall of the gas-phase space, a temperature gradient region having a temperature gradient along the upstream or downstream direction of the flow of molten glass from the high-temperature region of the wall is formed by heating and/or radiating heat from the glass processing device. In order to enable the minimization of agglomeration of volatilized platinum-group metals present in the gas-phase space, the temperature difference between the minimum and maximum temperature in the temperature gradient region is maintained so as not to exceed 150℃.
Provided is a manufacturing method for glass substrate in which there is minimal danger of contaminating the glass substrate by platinum impurities, and with which it is possible to produce high-quality glass substrates. This manufacturing method for glass substrate involves processing molten glass using a processing device having a gas phase space formed by an inner wall and a molten glass liquid level, and in which at least part of the inner wall which comes into contact with the gas-phase space comprises a material that contains a platinum-group metal. When treating molten glass in the region of the processing device that comes into contact with the gas-phase space, a high-temperature region and a low-temperature region having a lower temperature than the high-temperature region are formed, and on the outside of the processing device, a heat transfer medium is provided which supports the processing device and which transfers heat from the high-temperature region to the low-temperature region, and the heat transfer quantity of the heat transfer medium is adjusted in such a manner that the difference in temperature between the high-temperature region and the low-temperature region does not exceed a reference value.
Provided are a method for producing a glass substrate and a glass-substrate production device which make it possible to control the flow of molten glass even when there is a lot of molten-glass flow. When treating molten glass, the present invention: heats a treatment device by electrifying the treatment device in a manner such that the temperature of the molten glass inside the treatment device is within a range suitable for the treatment; controls the flow of the molten glass inside the treatment device using an amount of power for the electrification; and adjusts the amount of heat released to the exterior from the treatment device in a manner such that the amount of power is at or above the level at which it is possible to control the flow of the molten glass, and the temperature of the molten glass is in a temperature range in which it is possible to control the flow of the molten glass.
A method for producing a glass substrate comprises a step of treating a molten glass containing a clarifying agent, which is an agent capable of releasing oxygen through a reduction reaction, using a treatment apparatus in which at least a part of the inner wall is made from a material containing a platinum-group metal. In the step of treating the molten glass, the amount of oxygen to be released from the molten glass is controlled in a gas phase space formed between the inner wall of the treatment apparatus and the surface of the molten glass, whereby the concentration of oxygen in the gas phase space is so controlled as to prevent the volatilization of the platinum-group metal. In the inside of the treatment apparatus, a released bubble amount maximum position is so adjusted that the released bubble amount maximum position and a highest temperature position are separated from each other as observed in the direction of the flow of the molten glass, wherein the released bubble amount maximum position is a position at which the amount of bubbles released from the surface of the molten glass into the gas phase space becomes maximum and the highest temperature position is a position at which the temperature distribution of the molten glass achieves a peak as determined in the direction of the flow of the molten glass.
A method for producing a glass substrate has a surface treatment step for conducting surface treatment to form unevenness on a glass surface. In the surface treatment step, scattered protrusions having a height of 1 nm or more from the mean line of the roughness curve are formed on the glass surface. In the surface treatment step, surface treatment is carried out so that the protrusion area ratio is 0.5%-10%. The protrusion area ratio is the ratio of the area of protrusions to the area of any rectangular region. A rectangular region has a square shape 1 μm long on a side. In the surface treatment step, surface treatment is carried out so that the protrusion content ratio is 80% or higher when a rectangular region is evenly divided into at least 100 divided regions having a square shape. The protrusion content ratio is the ratio of the number of divided regions having protrusions to the number of divided regions included in the rectangular region.
G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
26.
Method for making glass substrate for display, glass substrate and display panel
A method for manufacturing a glass substrate for a display includes a step of producing a glass substrate and a step of performing a surface treatment on one glass surface of major surfaces of the glass substrate to form surface unevenness. The surface treatment is performed such that protruded portions having a height of 1 nm or more from the surface roughness central plane of the surface unevenness are dispersedly provided on the glass surface after the surface treatment and the area ratio of the protruded portions with respect to the area of the glass surface is 0.5-10%. Using this glass substrate, semiconductor elements are formed on a major surface of the glass substrate opposite to the glass surface. Accordingly, a display panel is produced.
H01L 29/04 - Semiconductor bodies characterised by their crystalline structure, e.g. polycrystalline, cubic or particular orientation of crystalline planes
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
H01L 21/48 - Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the groups or
C03C 15/00 - Surface treatment of glass, not in the form of fibres or filaments, by etching
H01L 33/08 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof characterised by the semiconductor bodies with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
27.
METHOD FOR MANUFACTURING GLASS SUBSTRATE AND DEVICE FOR MANUFACTURING GLASS SUBSTRATE
A method for manufacturing a glass substrate, including: a step for melting a raw glass material in order to form glass that includes tin oxide and is difficult to melt, by combustion heating in a gas phase by a combustion means and joule heating by causing a current to flow in molten glass, within a melting pot; and a clarifying step for clarifying the molten glass by a redox reaction of the tin oxide. The combustion heating and the joule heating are performed such that a heat ratio of heat from the combustion heating to heat from the joule heating is 1.0 to 3.4. When making molten glass to become glass that has a viscosity of 102.5 poise at a temperature of 1580˚C or greater, the heat ratio is 1.0 to 2.8.
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
C03C 3/083 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
28.
GLASS SUBSTRATE MANUFACTURING METHOD AND GLASS SUBSTRATE MANUFACTURING DEVICE
A glass substrate manufacturing method comprises a forming step and a cooling step. In the forming step, molten glass is formed into a sheet glass by a down draw method. In the cooling step, the sheet glass is cooled, the sheet glass including side portions which are areas of both edges of the sheet glass in the width direction and a central area which is an area that is on the inside of the sheet glass in the width direction than the side portions and that includes the center portion of the sheet glass in the width direction. The cooling step comprises a first cooling step, a second cooling step and a third cooling step. In the first cooling step, the central area is cooled at a first average cooling speed until the temperature of the center portion of the sheet glass in the width direction reaches an annealing point. In the second cooling step, the central area is cooled at a second average cooling speed until the temperature of the center portion changes from the annealing point to a strain point. In the third cooling step, the central area is cooled at a third average cooling speed until the temperature of the center portion changes from the strain point to a strain point-100°C. The third average cooling speed is smaller than the second average cooling speed.
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
29.
Glass substrate for flat panel display and manufacturing method thereof
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03C 3/093 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium containing zinc or zirconium
H01L 51/00 - Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof
3)/RO equal to or greater than 6. A method for manufacturing a glass substrate involves: a melting step of obtaining a molten glass by melting, by employing at least direct electrical heating, glass raw materials blended so as to provide the aforementioned glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
In a method for manufacturing a glass substrate with a down draw method, a bushing chamber (30) is provided with a heating element (28), a molding body (14) and an inner partition wall (16) that divides the heating element (28) and the molding body (14). An SiC sintered body with an open porosity of 1% or less is used for the inner partition wall (16), and molten glass (MG) which flows over the molding body (14) is heated by the heating element (28) via the inner partition wall (16). Thus, oxidation expansion of the inner partition wall (16) can be suppressed.
A method for manufacturing a glass substrate in which platinum contamination of a glass product can be reduced comprises a melting step, a refining step and a molding step. A refiner which is used in the refining step is composed of platinum or a platinum alloy and has a flange-shaped electrode for electrically heating the refiner. In the refining step, molten glass is de-foamed by being passed through the electrically heated refiner with the liquid level adjusted such that the refiner has a gas space, the electrode is cooled to suppress heating of the electrode, and the cooling of the electrode is controlled such that the temperature of the refiner wall exceeds the temperature at which platinum steam that is generated in the gas space in the refiner condenses.
In manufacturing a glass plate, molten glass which is obtained by feeding glass raw material into a melting tank and which is supplied to a forming body through a glass introduction portion from the melting tank is used to form a glass plate by a down-draw method. A draw amount per unit time of the molten glass that is drawn from the melting tank is calculated on the basis of the weight of the formed glass plate. At this point, by setting a target feed amount of the glass raw material per unit time for feeding the glass raw material into the melting tank or by setting a target draw amount per unit time of the molten glass that is drawn from the melting tank on the basis of the calculation results of the draw amount so that the liquid level of the molten glass in the melting tank is positioned within a target range, the feed amount of the glass raw material and the draw amount of the molten glass are matched.
The present invention can reduce the energy required for manufacturing glass substrates compared to the prior art and prevents foam quality degradation for glass substrates. In a stirring step, the viscosity of molten glass is set at 500 - 2000 poise, and also the partial pressure of water vapor in the atmosphere around a platinum or platinum alloy container is set at 0.6 - 12 kPa.
In the present invention, a glass substrate fabrication method has a molding step in which molten glass is molded into sheet glass by means of the down draw method using a molded body disposed in a molding furnace chamber, and a cooling step in which when the sheet glass is passed through a slow cooling furnace chamber located next to the molding furnace chamber, the sheet glass is gradually cooled while the temperature distribution in the width direction of the sheet glass is controlled. The slow cooling furnace chamber is divided into at least two spaces. A heat insulation plate with prescribed insulating properties is used for at least either the partition wall between the molding furnace chamber and the slow cooling furnace chamber or for the partition wall between the spaces within the slow cooling furnace chamber.
In manufacturing a glass substrate according to this process, a fused glass is formed into a sheet glass by an overflow process using a forming member in an upper space in a forming furnace, and then the sheet glass is made to flow from the upper space to a lower space wherein both edges of the sheet glass are cooled. The upper space is separated from the lower space by a heat-insulating member. The heat-insulating member has heat-insulating properties such that: when the fused glass is passing the forming member, the temperature of the fused glass can be controlled to the liquidus temperature or higher, while when the fused glass is passing the lowermost part of the forming member, the viscosities of both edges of the fused glass can be controlled to 104.3 to 106dPa·sec; and when the temperature of the central part of the sheet glass in the lower space is within a temperature range between a temperature higher than the softening point and a temperature in the vicinity of the annealing point, the viscosities of both edges of the sheet glass can be controlled to 109.0 to 1014.5dPa·sec.
Provided is a device for manufacturing a glass substrate and a method for manufacturing a glass substrate, whereby the amount of volatile matter that adheres to the inside of a clarification tube can be reduced even when SnO2, etc., having a low environmental impact is used as a clarifying agent during degassing processing by heating a clarification tube in the process of manufacturing a glass substrate. During degassing by passing molten glass through a clarification tube, a vapor-phase space as a space above a liquid surface of the molten glass is set in advance in a top region inside the clarification tube. A reinforcing part is formed in a least a portion of the set vapor-phase space so as to have a shape that does not cause stagnation of an air flow in the vapor-phase space.
Provided is a method for production of a glass substrate, whereby the eroded length of an electrode in the dissolution bath during operations can be correctly estimated, and the operating interval extended. The method includes a step of calculating the amount of tin oxide eluted into the glass substrate from the electrode, on the basis of difference between the weight of the tin oxide contained in the glass substrate and the weight of the tin oxide supplied to the glass substrate from the glass starting material; a step of calculating the eroded length of the electrode on the basis of the eluted weight; and a step of pushing the electrode to a predetermined position towards the direction of the molten glass, on the basis of the eroded length.
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
39.
GLASS-MELTING METHOD, PROCESS FOR MANUFACTURING GLASS SUBSTRATE AND GLASS-MELTING APPARATUS
Provided are: a glass-melting method by which the increase in frictional resistance between an electrode and a through hole of a melting vessel in thrusting the electrode through the through hole is suppressed to enable stable and long-term melting of glass in the melting vessel; a process for manufacturing a glass substrate; and a glass-melting apparatus. This glass-melting method includes: a measurement step for measuring, in subjecting an electrode which has shortened to pushing with a pressing member toward molten glass, the inclination of the rear end face of the electrode with respect to the central axis of a through hole; a deciding step for deciding, on the basis of the result obtained in the measurement step, the pressing direction in which the pressing member is to be pressed; and a pressing step for pressing the rear end face of the electrode with the pressing member in the pressing direction decided in the deciding step.
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
The method for producing a glass sheet by down-drawing includes an air pressure controlling step of controlling the air pressure of a furnace outside space formed between a furnace and a covering part that covers the furnace, the furnace including a forming furnace and a lehr, a melting step of melting glass raw materials to form molten glass, a supplying step of supplying the molten glass to a forming cell disposed inside the forming furnace, a forming step of forming a glass sheet by allowing the molten glass to flow down the forming cell, an annealing step of cooling the glass sheet while allowing the glass sheet to flow in one direction in the lehr, and a cutting step of cutting the glass sheet that has been cooled. In the air pressure controlling step, air pressure is controlled such that the air pressure is higher, inside the furnace outside space, at a position more toward the upstream side of the flow direction of the glass sheet.
C03B 25/12 - Annealing glass products in a continuous way with vertical displacement of the glass products of glass sheets
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
42.
Glass composition, glass substrate for flat panel display using the same, flat panel display, and method for producing glass substrate for flat panel display
3, and is substantially free of BaO. In this glass composition, the total content of alkaline earth metal oxides (MgO+CaO +SrO) is 10 to 18.5 mass %. The devitrification temperature of the glass composition is 1200° C. or lower.
A method for manufacturing a glass substrate for a display includes a step of producing a glass substrate and a step of performing a surface treatment on one glass surface of major surfaces of the glass substrate to form surface unevenness. The surface treatment is performed such that protruded portions having a height of 1 nm or more from the surface roughness central plane of the surface unevenness are dispersedly provided on the glass surface after the surface treatment and the area ratio of the protruded portions with respect to the area of the glass surface is 0.5-10%. Using this glass substrate, semiconductor elements are formed on a major surface of the glass substrate opposite to the glass surface. Accordingly, a display panel is produced.
H01L 29/04 - Semiconductor bodies characterised by their crystalline structure, e.g. polycrystalline, cubic or particular orientation of crystalline planes
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
H01L 21/48 - Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the groups or
C03C 15/00 - Surface treatment of glass, not in the form of fibres or filaments, by etching
H01L 33/08 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof characterised by the semiconductor bodies with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
44.
METHOD FOR PRODUCING GLASS SUBSTRATE AND DEVICE FOR PRODUCING GLASS SUBSTRATE
A method for producing a glass substrate comprises heating and defoaming molten glass in the interior of a clarifier tank body constituted of a platinum group metal. A gas-phase space is provided between the interior surface of the clarifier tank body and the liquid surface of the molten glass in the interior of the clarifier tank body; and a clarifier tank shape-retaining means for preventing heat from deforming the portion of the clarifier tank body that is in contact with the gas-phase space is provided to the clarifier tank body. A flame-resistant protective layer is provided to the outside of the clarifier tank body so as to cover the clarifier tank body, and the clarifier tank shape-retaining means is provided so as to tightly hold the outside of the clarifier tank body and the flame-resistant protective layer.
A production method for a glass plate, including: a step in which an end surface of the glass plate is ground; and a step in which the end surface of the glass plate after grinding is polished. The step in which the end surface of the glass plate is ground includes: a first grinding step in which the end surface of the glass plate is ground using a first grinding wheel having abrasive grains solidified by a first binding agent; and a second grinding step in which, after the first grinding step, the end surface of the glass plate is ground using a second grinding wheel having abrasive grains solidified by a second binding agent having a lower hardness and rigidity than the first binding agent.
B24B 9/10 - Machines or devices designed for grinding edges or bevels on work or for removing burrsAccessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of plate glass
B24B 7/24 - Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfacesAccessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass
C03C 19/00 - Surface treatment of glass, not in the form of fibres or filaments, by mechanical means
A glass-plate manufacturing method employing a down-draw process includes: a forming step of forming a sheet glass by making a molten glass flow downward along opposite side surfaces of a forming member and merge at a lower section of the forming member; and a cooling step of cooling the sheet glass while drawing the sheet glass downward with rollers. In the cooling step, an above-glass-strain-point temperature control step is performed which is a step of performing a temperature control in the width direction of the sheet glass in a temperature region ranging from the lower section of the forming member to where the temperature of the sheet glass falls below a temperature region near the glass strain point, and includes: first, second and third temperature control steps as defined herein.
In the manufacture of a glass substrate, continuous sheet glass is molded by causing molten glass to overflow from a molding body to thereby create the flow of the sheet glass. When the sheet glass is cooled, annealing in which while the distribution of heat supplied by a heat source provided along the width direction of the sheet glass is eased, the sheet glass is cooled by giving a temperature distribution thereto along the width direction of the sheet glass by means of the heat source in order to reduce the warpage and strain of the glass substrate is performed. This annealing is performed in a region in the flow direction of the sheet glass between an annealing point position in the flow direction of the sheet glass corresponding to the annealing point of the sheet glass and a strain point position in the flow direction of the sheet glass corresponding to the strain point of the sheet glass.
A glass-substrate manufacturing method which includes a forming step and a cooling step. In the forming step, a molten glass is formed into a sheet glass by a down-draw process. In the cooling step, the sheet glass is cooled. The cooling step includes first, second and third coating steps as defined herein.
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
The present invention provides: a glass substrate for flat panel displays, which has a good balance between low thermal shrinkage and suppression of devitrification; and a flat panel display. A glass substrate for flat panel displays of the present invention contains, in mol%, 55-80% of SiO2, 8-20% of Al2O3, 0-8% of B2O3, more than 0% but 15% or less of MgO, 0-20% of CaO, 0-15% of SrO, and 0-10% of BaO, with SiO2 + 2 × Al2O3 being 100% or less. This glass substrate for flat panel displays has a molar ratio B2O3/(SiO2 + Al2O3) of 0-0.12, a molar ratio MgO/RO within the range of 0.15-0.9, a devitrification temperature of less than 1,280˚C, and a thermal shrinkage of 3 ppm or more but less than 75 ppm as calculated by the formula below after being heated from room temperature at 10˚C/min, maintained at 550˚C for 2 hours, and cooled to room temperature at 10˚C/min. Thermal shrinkage (ppm) = {amount of shrinkage of glass before and after heat treatment/length of glass before heat treatment} × 106
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
This method for producing glass is provided with a stirring step for stirring molten glass (MG). The stirring step comprises a first stirring step and a second stirring step. In the first stirring step, molten glass (MG) is stirred in a first stirring tank (100a) while guiding from bottom to top. In the second stirring step, the molten glass (MG) stirred in the first stirring step is stirred in a second stirring tank (100b) while guiding from top to bottom. The first stirring tank (100a) is provided with a first discharge tube (110a) that can discharge the molten glass (MG) from the bottom of a first chamber (101a). The second stirring tank (100b) is provided with a second discharge tube (110b) that can discharge the molten glass (MG) from the liquid level (LL) of the molten glass (MG) in a second chamber (101b).
This method for manufacturing a glass plate includes a melting step, a fining step, and a forming step. In the melting step, molten glass is produced by using at least electrical heating to melt a glass feedstock containing SnO2 as a fining agent. The fining step includes the following: a bubble-removal process, after the melting step, in which the temperature of the molten glass is raised to at least 1,630°C at a rate of at least 2°C/min so as to generate bubbles therein in order to perform bubble removal; and an absorption process, after the bubble-removal process, in which the temperature of the molten glass is reduced so as to make the molten glass absorb the bubbles therein. In the forming step, the post-fining-step molten glass is formed into plate glass.
This method for manufacturing a glass plate includes a melting step, a fining step, and a forming step. In the melting step, molten glass is produced by using at least electrical heating to melt a glass feedstock containing SnO2 as a fining agent. The fining step includes the following: a bubble-removal process in which the temperature of the molten glass is raised to at least 1,630°C so as to generate bubbles therein in order to perform bubble removal; and an absorption process, after the bubble-removal process, in which the temperature of the molten glass is reduced at a rate of at least 2°C/min over the temperature range from 1,600°C to 1,500°C so as to make the molten glass absorb the bubbles therein. In the forming step, a down-draw process is used to form the post-fining-step molten glass into plate glass.
A glass plate manufacturing method comprises: a melting step for melting a glass starting material to obtain molten glass; a forming step for supplying the molten glass to a forming body provided in a forming furnace to form a glass ribbon and creating the flow of the glass ribbon; a slow cooling step for drawing the glass ribbon by a roller provided in a slow cooling furnace and cooling the glass ribbon in the slow cooling furnace; a glass ribbon cutting step for cutting the cooled glass ribbon in a glass ribbon cutting space; and an edge portion cutting step for cutting, in an edge portion cutting space, edge portions formed respectively at both ends in the width direction of the cut glass ribbon. The atmospheric pressure in the glass ribbon cutting space and/or the edge portion cutting space is adjusted such that the atmospheric pressure in the glass ribbon cutting space is higher than the atmospheric pressure in the edge portion cutting space.
The present invention provides a method with which a glass substrate ideal for LTPS·TFT in that it has a thermal contraction rate that allows for control of pixel pitch shift can be produced without compromising productivity using glass having a composition that is ideal for obtaining a light weight. The disclosed invention is a method for producing a glass substrate for a flat panel display. The production method comprises (1) a melting step for preparing and melting the starting materials such that the resulting glass substrate will have a combined SrO and BaO content of less than 8 mass% and a strain point of 675ºC or less, (2) a forming step for forming glass ribbon from the molten glass by the overflow downdraw method, and (3) a cooling step for cooling the formed glass ribbon under the following condition (A), where (A) is an average rate of cooling from the annealing point to a temperature of (the strain point - 50ºC) = less than 0.5 to 5.5ºC/second.
C03B 25/087 - Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets being in a vertical position
G02F 1/1368 - Active matrix addressed cells in which the switching element is a three-electrode device
G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
H01L 51/50 - Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for light emission, e.g. organic light emitting diodes (OLED) or polymer light emitting devices (PLED)
Provided is a glass substrate for a flat panel display, said glass substrate combining productivity and reduction in thermal shrinkage coefficient and being suitable for a flat panel display using a TFT. A glass substrate on which a TFT is to be formed and which is to be used in producing a flat panel display, comprising, in molar %, 55 to 80% of SiO2, 3 to 20% of Al2O3 and 3 to 15% of B2O3, and having a (SiO2 - 1/2Al2O3) value of 70% or less, a (SiO2+2×Al2O3)/B2O3 molar ratio of more than 9.5 to 19.0, a devitrification temperature of lower than 1280°C, and a thermal shrinkage coefficient of 60ppm or less as determined after a glass specimen has been heated from ordinary temperature at a rate of 10°C/min, kept at 550°C for one hour, cooled to ordinary temperature at a rate of 10°C/min, heated again at a rate of 10°C/min, kept at 550°C for one hour, and then cooled to ordinary temperature at a rate of 10°C/min, and as represented by the formula: thermal shrinkage coefficient (ppm) = {shrinkage of the glass specimen caused by the heat treatment/length of the glass specimen before the heat treatment} × 106.
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
G09F 9/30 - Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
58.
METHOD FOR MANUFACTURING GLASS SHEET, AND APPARATUS FOR MANUFACTURING GLASS SHEET
During manufacturing of a glass sheet by the present invention, glass raw material is melted to obtain molten glass, and the molten glass is supplied to a mold disposed in a molding space surrounded by molding furnace walls, which are the furnace walls of a molding furnace. A sheet glass is molded using a downdraw process from the molten glass supplied to the mold. The sheet glass is then annealed in an annealing space which is a space located below the molding space, the annealing space being surrounded by annealing furnace walls, which are the furnace walls of the annealing furnace. The annealed sheet glass is cut in a cutting space located below the annealing furnace, and a glass sheet is obtained. At this time, atmospheric pressure control is performed so that the atmospheric pressure in a furnace-external space located above the cutting space and inside a structure-internal space defined by the outer surfaces of the annealing furnace walls, the outer surfaces of the molding furnace walls, and the inner wall surfaces of a structure for housing the molding space, the annealing space, and the cutting space is increased relative to the atmospheric pressure outside the structure.
3)/RO is equal to or greater than 5. A related method involves melting glass raw materials blended to provide the glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
3)/RO equal to or greater than 6. The present method for manufacturing a glass substrate involves: a melting step of obtaining a molten glass by melting, by employing at least direct electrical heating, glass raw materials blended so as to provide the aforementioned glass composition; a forming step of forming the molten glass into a flat-plate glass; and an annealing step of annealing the flat-plate glass.
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
C03C 3/093 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium containing zinc or zirconium
63.
Glass substrate for flat panel display and manufacturing method thereof
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
H01L 51/00 - Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof
A method of manufacturing a glass sheet according to the present invention comprises the steps of creating split flows of molten glass in a forming body 10 and causing the molten glass to flow down, subsequently merging the flows at a merging point to form a glass sheet G and causing the glass sheet to flow downward in the vertical direction. In this method of manufacturing a glass sheet, a partition member 20 is disposed facing the glass sheet G in the vicinity of a location below the forming body 10, and a facing surface of the partition member 20 is shaped so as to correspond to a sheet thickness variation of the glass sheet G, so that a gap between the glass sheet G and the partition member 20 is substantially uniform.
This glass substrate for a flat panel display contains, in mol%, 55%-80% SiO2, 3%-20% Al2O3, 3%-15% B2O3, and 3%-25% RO (being the combined amount of MgO, CaO, SrO, and BaO). The content ratio between SiO2, Al2O3, and B2O3, in mol%, fulfills the relationship (SiO2+Al2O3)/(B2O3)=7.5-17. The glass substrate is configured from glass having a strain point of at least 665° and a devitrification temperature of no more than 1,250°C, and has a thermal shrinkage rate of no more than 75 ppm. The thermal shrinkage rate is the value found using the following formula, using the amount of shrinkage of the glass substrate after heat processing at a temperature rising/falling speed of 10°C/min, held at 550°C for two hours. Thermal shrinkage rate (ppm) = {Amount of glass substrate shrinkage after heat processing/length of the glass substrate prior to heat processing} x106.
H01L 51/50 - Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for light emission, e.g. organic light emitting diodes (OLED) or polymer light emitting devices (PLED)
This glass substrate for a flat panel display contains, in mol%, 55%-80% SiO2, 3%-20% Al2O3, 3%-15% B2O3, and 3%-25% RO (being the combined amount of MgO, CaO, SrO, and BaO), does not substantially contain As2O3 or Sb2O3, is configured from glass having a devitrification temperature of no more than 1,250°C, and has a thermal shrinkage rate of no more than 75 ppm. The thermal shrinkage rate is the value found using the following formula, using the amount of shrinkage of the glass substrate after heat processing at a temperature rising/falling speed of 10°C/min, held at 550°C for two hours. Thermal shrinkage rate (ppm) = {Amount of glass substrate shrinkage after heat processing/length of the glass substrate prior to heat processing} x106.
H01L 51/50 - Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for light emission, e.g. organic light emitting diodes (OLED) or polymer light emitting devices (PLED)
A glass ribbon is formed from molten glass in such a manner that the molten glass is caused to overflow a supply groove in the upper part of a forming body, the molten glass is allowed to flow down along the wall surfaces on both sides of the lower part of the forming body while the flow of the molten glass is restricted by a pair of guides protruding from the wall surfaces of the forming body, the molten glass is conducted to the lowermost end of the forming body, and the streams of the molten glass flowing along the wall surfaces on both sides are merged at the lowermost end. The wall surfaces of the forming body along which the molten glass flows include: vertical wall surfaces along which the molten glass flows down in the vertical direction; and sloped wall surfaces for conducting the molten glass, which has flowed down along the vertical wall surfaces, to the lowermost end of the forming body. In the entire region in which the guides protrude from the sloped wall surfaces, the height of the pair of guides from the wall surfaces is set to be less than the thickness of the molten glass.
Provided are: a glass substrate for a p-Si TFT flat panel display comprising glass having a high characteristic temperature in a low-temperature viscosity range such as strain point and glass transition temperature, having a low thermal shrinkage rate, and capable of avoiding the occurrence of the issue of melting tank erosion loss during melting by direct ohmic heating; and a production method therefor. This glass substrate comprises glass containing 52%-78% by mass SiO2, 3%-25% by mass Al2O3, 3%-15% by mass B2O3, 3%-25% by mass RO (RO being the combined amount of MgO, CaO, SrO, and BaO), 0.01%-1% by mass Fe2O3, and 0%-0.3% by mass Sb2O3, does not substantially contain As2O3, has a mass ratio for (SiO2+Al2O3)/B2O3 in the range of 7-30, and a mass ratio for (SiO2+Al2O3)/RO of at least 6. This production method for the glass substrate has: a melting step in which a glass raw material prepared so as to form a glass composition is melted using at least direct ohmic heating and a molten glass is obtained; a molding step in which the molten glass is molded into a planar glass; and a gradual cooling step in which the planar glass is gradually cooled.
Provided are: a glass substrate for a p-Si TFT flat panel display, comprising a glass having a high low-viscosity characteristic temperature and capable of being produced while avoiding the occurrence of the issue of melting tank erosion loss during melting by direct ohmic heating; and a production method therefor. This glass substrate comprises 52%-78% by mass SiO2, 3%-25% by mass Al2O3, 3%-15% by mass B2O3, 3%-20% by mass RO (RO being the combined amount of MgO, CaO, SrO, and BaO), 0.01%-0.8% by mass R2O (R2O being the combined amount of Li2O, Na2O, and K2O), and 0%-0.3% by mass Sb2O3, does not substantially contain As2O3, and has a mass ratio for CaO/RO of at least 0.65, a mass ratio for (SiO2+Al2O3)/B2O3 of 7-30, and a mass ratio for (SiO2+Al2O3)/RO of at least 5. This production method for the glass substrate has: a melting step in which a glass raw material, prepared so as to form a glass composition, is melted using at least direct ohmic heating and a molten glass is obtained; a molding step in which the molten glass is molded into a planar glass; and a gradual cooling step in which the planar glass is gradually cooled.
e have support plates 108 and ancillary plates 109. The ancillary plates 109 create, in the molten glass 7, a flow in the radial direction of the shaft 105.
A glass plate manufacturing method comprises: a melting step for melting a glass starting material to obtain molten glass; a forming step for supplying the molten glass to a forming body provided in a forming furnace to form a glass ribbon and creating the flow of the glass ribbon; a slow cooling step for pulling the glass ribbon by a roller provided in a slow cooling furnace and cooling slowly the glass ribbon in the slow cooling furnace; and a cutting step for cutting the cooled glass ribbon in a cutting space. When the interior space of the forming furnace and the interior space of the slow cooling furnace are defined as a furnace interior space and the exterior spaces of the forming furnace and the slow cooling furnace are defined as a furnace exterior space, the furnace exterior space is a space separated from an atmospheric pressure atmosphere by a partition wall. The atmospheric pressure in the furnace exterior space is adjusted such that the atmospheric pressure in at least a part of the furnace exterior space is lower than the atmospheric pressure in the furnace interior space at the same position in the flow direction of the glass ribbon.
A production method for glass plates that uses the downdraw method and comprises a compression step, a temperature-raising step, a melting step, a molding step, and a cutting step. In the compression step, a molded body is compressed along one direction of the molded body, so as to restrict relative displacement of the molded body caused by increased molded body temperature. In the temperature-raising step, the ambient temperature for the compressed molded body is raised using a temperature-raising device. In the melting step, a glass raw material is melted to become molten glass. In the molding step, the molten glass is molded into sheet glass using the temperature-raised molded body. In the cutting step, the sheet glass is cut to form glass plates. As a result, reduction in glass plate quality is further minimized.
When producing a glass sheet, a glass raw material is melted and used as molten glass, the molten glass is caused to flow and be conveyed inside piping made of a platinum-group element or a platinum-group element alloy, and is supplied to a molding device. The piping conveying the molten glass has: a first pipe and a second pipe that are arranged separate and have a thermal expansion-allowing space, which allows thermal expansion during operation, formed therebetween; and a covering member which covers the end sections of the first and second pipes and the thermal expansion-allowing space, and which is movably supported in the axial direction relative to the first and second pipes. When molten glass is being conveyed from the first pipe via the thermal expansion-allowing space to the second pipe, the amount of heat transferred from the molten glass to outside the covering member is increased and the viscosity of the molten glass is increased, compared to when the molten glass is conveyed in the first and second pipes. As a result, deformation of and damage to the piping in which the molten glass flows are reduced.
A glass plate production method using the downdraw method comprises: an air-pressure control step in which the air pressure of a furnace external space is controlled, said space being formed between furnaces, including a molding furnace and a slow-cooling furnace, and a cover section covering said furnaces; a melting step in which a glass raw material is melted and used as molten glass; a supply step in which the molten glass is supplied to a molding body arranged inside the molding furnace; a molding step in which the molten glass is caused to flow down into the molding body and a glass plate is formed; a slow-cooling step in which the glass plate is cooled while being fed in one direction in the slow-cooling furnace; and a cutting step in which the cooled glass plate is cut. In the air-pressure control step, the air pressure is controlled such that the air pressure is higher the further a position is on the upstream side in the direction that the glass plate travels inside the furnace external space.
When producing a glass sheet, a glass raw material is melted to create molten glass, the molten glass is molded using the downdraw method, a glass ribbon is formed, and the glass ribbon is drawn downwards and annealed while being sandwiched between a plurality of roller pairs disposed along the conveyance direction for the glass ribbon. During molding, both ends of the glass ribbon are cooled while the glass ribbon continues to be sandwiched between the roller pairs and drawn downwards. Each roller in a first roller pair, which is one of the roller pairs used either in molding or annealing, is rotatably driven on the basis of a roller rotation speed determined so as to compensate for roller diameter change.
A glass sheet production method having: a melting step; a molding step that uses the overflow downdraw method; and a glass ribbon annealing step. In the glass ribbon annealing step, a glass ribbon is drawn downwards and annealed while a neighboring area adjacent in the width direction of the glass ribbon relative to both end sections in the glass ribbon width direction is sandwiched between a plurality of conveyance roller pairs disposed in the conveyance direction for the glass ribbon. In the molding step, after the glass ribbon is formed, both end sections of the glass ribbon in the width direction are cooled faster than the center section of the glass ribbon in the width direction. In the annealing step, tension is applied to the glass ribbon in the conveyance direction, in a temperature range in which the temperature of the glass ribbon is at least the glass transition temperature but no more than the glass softening point, so that plastic deformation does not occur in the glass ribbon.
This method for producing a glass substrate involves a fining step of fining a molten glass while making the molten glass flow through a pipe of which the outer peripheral wall made of platinum or a platinum alloy is heated. The fining step involves a bubble removal step of releasing bubbles contained in the molten glass from the liquid surface of the molten glass toward the gas phase inside the pipe. In the bubble removal step, the temperature distribution of the molten glass along the radial direction of the pipe is made uniform by stirring the molten glass.
AVANSTRATE TAIWAN INC. (Taiwan, Province of China)
Inventor
Murakami, Tsugunobu
Kimijima, Tetsuo
Hioki, Noriyuki
Fujimoto, Shingo
Abstract
A glass substrate production method that solves the problem of degradation, etc., of conventional temperature measurement means during conduction heating of molten glass and maintains at a desired state the viscosity and convection of the molten glass. The glass substrate production method includes: a step in which the molten glass is arranged between a pair of electrodes and voltage is applied thereto, and current is supplied to the molten glass and Joule heat is generated; a step in which the current value and the voltage value are measured and the specific resistance of the molten glass is calculated; and a step in which the Joule heat is controlled on the basis of the calculated specific resistance.
C03B 5/027 - Melting in furnacesFurnaces so far as specially adapted for glass manufacture in electric furnaces by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
AvanStrate Taiwan Inc. (Taiwan, Province of China)
Inventor
Murakami, Tsugunobu
Fujimoto, Shingo
Abstract
This method for producing a glass plate involves a fining step of performing fining in a fining tank (102) that is made of platinum or a platinum alloy and that has a space therein for containing a gas caused by the removal of bubbles. In the fining step, a molten glass is heated by heating the fining tank (102) by passing a current therethrough. The fining tank (102) is characterized in that a portion thereof including at least a region in which the temperature of the molten glass becomes the highest inside the fining tank (102) is thicker than the other portions.
The purpose of the present invention is to produce a glass sheet unlikely to generate shape defects in the end section thereof, using a molded body having low risk of partial deficiency. The molded body for a glass sheet production device pertaining to this invention has: first inclined surfaces (16b), second inclined surfaces (16a1), and third inclined surfaces (16a2) that are pairs of inclined surfaces inclined so as to approach each other towards the bottom of said molded body; and a first arc surface (18b) and a second arc surface (18a). The first inclined surfaces (16b) are positioned in the center in the longitudinal direction of the molded body and the second inclined surfaces (16a1) and the third inclined surfaces (16a2) are positioned in both end sections. The second inclined surfaces (16a1) are inclined at the same angle as the first inclined surfaces (16b). The third inclined surfaces (16a2) are inclined at an angle closer to horizontal than the second inclined surfaces (16a1). The first arc surface (18b) and the second arc surface (18a) are connected to the bottom ends of the first inclined surfaces (16b) and the third inclined surfaces (16a2), respectively, and are arcs having a cross-sectional shape in the shorter direction that is vertically downward. The length in the shorter direction of the second arc surface (18a) is shorter than the length in the shorter direction of the first arc surface (18b).
This method for producing a glass plate involves: a step of conveying a molten glass containing at least SnO2 from a melting tank (101) to a fining tank (102) via a first transferring pipe (105a) (connection pipe) made of platinum or a platinum alloy; and a fining step of removing bubbles contained in the molten glass out from the molten glass inside the fining tank (102) which is made of platinum or a platinum alloy and has a space for containing a gas caused by the removal of bubbles. In this method for producing a glass plate, the molten glass is heated to a temperature of 1500-1690°C in the first transferring pipe (105a) (connection pipe), and the molten glass is heated to a temperature of 1600-1780°C in the fining tank (102). The temperature of the molten glass in the fining tank (102) is higher than the temperature of the molten glass in the first transferring pipe (105a) (connection pipe).
Provided is a glass plate production method capable of effectively reducing striae. Said method includes a supply step in which molten glass is supplied to a molding device by causing the molten glass to flow from one end of a third transfer pipe towards the other end; and uses a glass plate production method characterized by first reducing the temperature for the molten glass in the supply step to no less than 150°C at an average ratio of no more than 30°C/m and then providing the molten glass to the molding device via a section in the third transfer pipe having a higher temperature than molten glass in an interface region in contact with the inside of the third transfer pipe.
The present invention addresses the problem of providing a glass substrate production method that increases the amount of glass substrate produced and enables production of a suitable glass substrate, when producing a glass substrate using the downdraw method. This glass substrate production method comprises: a molding step and a cooling step. In the molding step, molten glass is molded into sheet glass using the downdraw method. In the cooling step, the sheet glass is cooled. The cooling step includes a first cooling step, a second cooling step, and a third cooling step. In the first cooling step, the temperature of the central region of the sheet glass is cooled at a first average cooling speed until same reaches an annealing point. In the second cooling step, the temperature of the central region is cooled at a second average cooling speed from the annealing point until same reaches the strain point-50°C. In the third cooling step, the temperature of the central region is cooled at a third average cooling speed from the strain point-50°C until same reaches the strain point-200°C. In addition the first average cooling speed is at least 5.0°C/s. The first average cooling speed is faster than the third average cooling speed. Also, the third average cooling speed is faster than the second average cooling speed.
The present invention addresses the problem of providing a method for manufacturing a glass substrate which is capable of increasing the production volume of glass substrates and reducing warping qualities. This method for manufacturing a glass substrate is a method that manufactures glass substrates using the downdraw method. In the downdraw method, melted glass is made to overflow from a mold to form sheet glass, and the sheet glass is cooled while stretched in the downstream direction. In this method for manufacturing a glass substrate, after the sheet glass is separated from the mold, while the temperature of the sheet glass is in the temperature range from above the softening point to near the annealing point and while applying tension towards the side sections thereof, the sheet glass is cooled with the viscosity of the side sections maintained within the range of 109.0-1014.5 poise.
This method for producing a glass substrate for a liquid crystal display device comprises: a raw material formulation step for using at least a silica raw material having SiO2 as a main ingredient and an adjustment raw material comprising iron oxide to prepare a formulation and make a glass raw material; a melting step for melting the glass raw material and generating molten glass; and a clarification step for clarifying the generated molten glass. The silica raw material comprises iron oxide as an impurity, and, where the iron oxide is represented by Fe2O3, the silica raw material comprises at most 0.001-0.028 mass% Fe2O3. The content of the adjustment raw material within the glass raw material is adjusted such that the transmittance for a wavelength of 300 nm in the glass substrate for the liquid crystal display device reaches at least 30%.
A glass sheet production method includes a step in which molten glass is clarified while the molten glass is caused to flow into a clarification tank which is a tubular container extending in the longitudinal direction, comprises a fire-retardant metal, and has a first section and a second section positioned downstream from the first section. Said step includes steps in which the molten glass in the first section is set to a first temperature and the molten glass in the second section is set to a second temperature lower than the first temperature.
AVANSTRATE TAIWAN INC. (Taiwan, Province of China)
Inventor
Kimijima, Tetsuo
Murakami, Tsugunobu
Hioki, Noriyuki
Fujimoto, Shingo
Abstract
In a melting step in a glass substrate production method: a molten glass having a uniform temperature for the surface layer thereof, including a liquid surface, is made by depositing a glass raw material on to substantially the entire liquid surface of a molten glass stored in a melting tank; and the molten glass is caused to flow towards a subsequent step, from a discharge port disposed in a floor section of an internal side wall facing a first direction, among internal side walls in the melting tank. When the molten glass is caused to flow, the temperature of the bottom layer of the molten glass, positioned lower than the surface layer in the thickness direction of the molten glass, and the amount of heat applied to the molten glass positioned at both end sections in the first direction in the melting tank are adjusted, such that convection caused by the temperature distribution of the molten glass in the bottom layer does not occur. As a result, the temperature distribution along the first direction of the molten glass in the bottom layer is made uniform.
AvanStrate Taiwan Inc. (Taiwan, Province of China)
Inventor
Fujimoto, Shingo
Murakami, Tsugunobu
Abstract
Provided is a method for producing a glass plate, the method characterized by comprising, prior to full operation of a glass plate production line, a preparation step for removing accretions on a surface of a mixing blade (103a) which contacts molten glass by subjecting the mixing blade (103a) made of platinum or platinum alloy to a heat treatment.
Provided is a glass plate production method that makes the plate thickness of a sheet glass as uniform as possible and is capable of reducing warpage and strain. Said method is a glass plate production method using the downdraw method and comprises: a molding step in which molten glass is caused to flow down along both side surfaces of a molding body and the sheet glass is molded by causing the molten glass to merge in the lower section of the molding body; and a cooling step in which the sheet glass is cooled while being pulled downwards by a roller. A glass strain point upper temperature control step is performed in the cooling step, said step including: a first temperature control step, being a step in which temperature control is performed in the sheet glass width direction, in a temperature region from the bottom section of the molding body up to where the temperature is below that of a temperature region in the vicinity of the glass strain point, such that the end sections in the width direction of the sheet glass are made to have a lower temperature than the central region sandwiched by the end sections and the temperature in the central section becomes uniform; a second temperature control step in which the temperature in the width direction of the sheet glass reduces from the central section towards the end sections; and a third temperature control step in which the temperature gradient between the end sections and the central region in the width direction of the sheet glass in the temperature region in the vicinity of the glass strain point is eliminated.
3. Also disclosed is a method for producing a cover glass which includes: (i) preparing molten glass by melting a glass raw material; (ii) forming the prepared molten glass into a plate-like shape by a down-draw process and thereby obtaining a glass substrate; and (iii) forming a compressive-stress layer on the surface of the glass substrate.
B32B 17/06 - Layered products essentially comprising sheet glass, or fibres of glass, slag or the like comprising glass as the main or only constituent of a layer, next to another layer of a specific substance
C03C 21/00 - Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals into the surface
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
91.
METHOD FOR MANUFACTURING GLASS SUBSTRATE, AND STIRRING DEVICE
A stirring device (100) provided with a chamber (101) and a stirrer (102) which stirs molten glass (7) within the chamber (101). The stirrer (102) is provided with: a shaft (105), which is a rotating shaft; and blades (106a-106e) which are arranged in tiers on the side surface of the shaft (105). The blades (106a-106e) each have support plates (108) and auxiliary plates (109). The auxiliary plates (109) generate the flow of the molten glass (7) in the radial direction of the shaft (105).
2O. The glass substrate may also contain 0% to 2.6% by mass of CaO, if necessary. The glass substrate has an etching characteristic in which the etching rate is at least 3.7 μm/minute in an etching environment having a temperature of 22° C. and containing hydrogen fluoride with a concentration of 10% by mass.
C03C 3/085 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
C03C 3/091 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium
C03C 3/093 - Glass compositions containing silica with 40% to 90% silica by weight containing boron containing aluminium containing zinc or zirconium
C03C 21/00 - Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals into the surface
C03C 3/087 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal containing calcium oxide, e.g. common sheet or container glass
C03C 15/00 - Surface treatment of glass, not in the form of fibres or filaments, by etching
C03C 3/083 - Glass compositions containing silica with 40% to 90% silica by weight containing aluminium oxide or an iron compound
C03C 15/02 - Surface treatment of glass, not in the form of fibres or filaments, by etching for making a smooth surface
In order for the formation or air bubbles in glass to be effectively inhibited while the life span of production equipment is extended, a method for producing a glass sheet comprises a clarification step, a homogenization step, and a feeding step, and this series of steps is performed in a platinum or platinum-alloy container. The clarification step comprises: a first step in which molten glass is heated within a range of 1610 to 1700ºC and up to a maximum temperature (T1) in the series of processes in order to cause air bubbles in the molten glass to float up and thereby remove the air bubbles; and a second step in which, after the first step, the gas component of the molten glass is absorbed at a temperature lower than the maximum temperature (T1) in order to remove the air bubbles. The water vapor partial pressure of the atmosphere surrounding a clarification cell in the first step is lower than the water vapor partial pressure of the atmosphere surrounding a clarification cell in at least part of the second step. The boundary between the first step and the second step is a temperature (T2) at which the molten glass, once having reached the maximum temperature (T1), is at least 30ºC lower than the maximum temperature (T1).
This glass sheet manufacturing method involves: forming a glass sheet (G) by forcing molten glass in a molding body (10) to split and flow downward, and then flow together at a confluence point; and then forcing the glass sheet to move in a downward vertical direction. In the glass sheet manufacturing method, partition members (20) are positioned near the bottom of the molding body (10) in such a manner as to face the glass sheet (G), and the facing surfaces of the partition members (20) are shaped so as to cope with variations in the thickness of the glass sheet (G), in such a manner that the space between the glass sheet (G) and the partition members (20) is substantially uniform.
This glass sheet manufacturing method involves: forming a glass sheet (G) by forcing molten glass in a molding body (10) to split and flow downward, and then flow together at a confluence point; and then forcing the glass sheet to move in a downward vertical direction. In the glass sheet manufacturing method, multiple partitioned chambers (42b, 42c,...) are provided by insulating plates (40a, 40b,...) in the direction in which the glass sheet (G) travels. In the glass sheet manufacturing method, heaters (60a, 60b,...) that control the chamber temperature are provided for each chamber (42b, 42c,...) in such a manner that the temperature sequentially drops in the direction in which the glass sheet (G) travels. The insulating plates (40a, 40b,...) are positioned in such a manner as to face the glass sheet (G), and the facing surfaces of the insulating plates (40a, 40b,...) are shaped so as to cope with variations in the thickness of the glass sheet (G), in such a manner that the space between the glass sheet (G) and the insulating plates (40a, 40b,...) is substantially uniform.
When manufacturing a glass substrate from molten glass by a downdraw process, two molten glass streams are formed on opposing wall surfaces of a forming body provided within a furnace chamber surrounded by a furnace wall, and then band-shaped glass formed when the two molten glass streams join together is caused to pass through a slit-like gap formed by heat insulation plates for partitioning the furnace chamber. When passing through the gap, the band-shaped glass is subjected to heat, the amount of which is substantially uniformly distributed in the width direction of the band-shaped glass, applied by opposing surfaces of the insulation plates, the opposing surfaces facing the band-shaped glass. Either a second material having a lower bubble content rate than a first material used for a heat insulation material or a second material having a higher heat conduction rate than the first material used for the heat insulation material is used for the opposing surfaces of the heat insulation plates, the opposing surfaces facing the band-shaped glass.
A glass plate production device of the present invention is a device capable of adjusting the speed of cooling of a glass plate. The glass plate production device produces a glass plate (91) by causing molten glass (90), which has overflowed from a forming body, to flow down along both side surfaces of the forming body (10) and then causing the flows of the molten glass to merge together in the vicinity of the lower end of the forming body. The glass plate production device comprises cooling adjustment plates and temperature control units. The cooling adjustment plates are located below the confluence of the flows of the molten glass so as to be arranged next to each other in the direction of the flow of the molten glass, and the cooling adjustment plates adjust the cooling speed of the glass plate. The temperature control units are respectively provided to the cooling adjustment plates and control the temperature of the cooling adjustment plates.
AvanStrate Taiwan Inc. (Taiwan, Province of China)
AvanStrate Inc. (Japan)
Inventor
Wang, Wen Kai
Chiu, Wen Lan
Chu, Chia Hsien
Kao, Jung Chih
Chiu, Chin Yi
Abstract
Disclosed is a method for manufacturing a glass substrate for a liquid crystal display device, wherein frequency of generation of watermarks after removing a liquid such as a detergent with an air jet is significantly reduced in comparison to that in conventional methods. In a washing process, the liquid such as a detergent is sprayed onto the surface of the glass substrate (3) to wash. Thereafter, in a removing process an air jet extending long is supplied from a slit (10g) of the nozzle assembly (10) of an air jetting device (1) onto the surface of the glass substrate (3) to remove the liquid such as a detergent. The air speed of the air jet from the slit (10g) is adjusted so as to be uniform in an extending direction by use of an air speed measuring device (40) and an air speed measuring tool (30).
C03C 23/00 - Other surface treatment of glass not in the form of fibres or filaments
B08B 3/02 - Cleaning by the force of jets or sprays
B08B 7/04 - Cleaning by methods not provided for in a single other subclass or a single group in this subclass by a combination of operations
G02F 1/13 - Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulatingNon-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
Disclosed is a glass plate manufacturing method which includes: a melting step wherein a molten glass is obtained by melting a glass raw material; a forming step wherein a glass ribbon is formed of the molten glass by means of a down-draw method; a vaporization promoting step wherein vaporization of vaporization components from the molten glass surface and/or the glass ribbon surface is promoted; a cooling step wherein the glass ribbon is cooled; and a cutting step wherein a glass plate is obtained by cutting the glass ribbon.
Disclosed is a glass plate which has, at the time of being manufactured by a down-draw method, the glass surface strengthened to a certain extent that the processing efficiency after the glass formation is not affected and the glass surface is not easily scratched. The glass plate has a tensile stress layer formed inside of the glass plate, and compression stress layers formed on both the sides of the tensile stress layer. The compression stress layers are formed within a depth range of 10-50 μm in the thickness direction of the glass plate from the surface of the glass plate, and the thickness of the compression stress layers is less than a thirteenth part of the thickness of the glass plate. The absolute value of the stress value of the compression stress layers is 4 MPa or less, and the absolute value of the stress value of the tensile stress layer is 0.4 MPa or less.
patents
