Abstract: A lithium containing glass article is provided. In aspects, the lithium containing glass article includes an intensity coupling profile including a plurality of coupling resonances. A first of the coupling resonances has a half-width half-maximum value that is at least 1.8 times greater than the half-width half-maximum value of a second of the coupling resonances. In aspects, the lithium containing glass article includes a smoothed intensity coupling profile including a plurality of coupling resonances. A second derivative of the smoothed intensity coupling profile at a first of the coupling resonances is at least 1.8 times greater than a second derivative of the smoothed coupling profile at a second of the coupling resonances.

Abstract: Embodiments of thermally and chemically strengthened glass-based articles are disclosed. In one or more embodiments, the glass-based articles may include a first surface and a second surface opposing the first surface defining a thickness (t), a first CS region comprising a concentration of a metal oxide that is both non-zero and varies along a portion of the thickness, and a second CS region being substantially free of the metal oxide of the first CS region, the second CS region extending from the first surface to a depth of compression of about 0.17•t or greater. In one or more embodiments, the first surface is flat to 100 ?m total indicator run-out (TIR) along any 50 mm or less profile of the first surface. Methods of strengthening glass sheets are also disclosed, along with consumer electronic products, laminates and vehicles including the same are also disclosed.

Abstract: A method for air quenching a glass hollow body elongated along a main axis, including a wall having an external surface, and an internal surface formed by a bore extending in height along the main axis, is provided. The method includes simultaneously blasting air jets towards the surfaces of the glass hollow body using air blast nozzles directed towards the surfaces. External nozzles distribute air jets over the external surface of the glass hollow body and a nozzle above the bore of the glass hollow body and aligned along the main axis distributes an internal air jet over the internal surface of the glass hollow body. In a transverse plane to the main axis the internal air jet is in the form of a crown having a recess at the center.

Abstract: An article of fire rated glass and method of producing the same prepared by selecting a sheet of clear float annealed glass of at least 19 millimeters in thickness and providing the edge of the sheet substantially free of imperfections. The glass sheet is then specially tempered at a temperature of at least 575 degrees Celsius for a period of at least 750 seconds, followed by fluid quenching.

Abstract: A non-frangible glass article strengthened by a dual or two-step ion exchange (IOX) process, where the first IOX step leads to a depth of compressive layer FSM_DOL>0.1·t or, in some embodiments, FSM_DOL>0.15·t, where t is the thickness of the glass, is provided. The glass article has a compressive stress CS1 after the first IOX step at the surface of from 100 MPa to 400 MPa or, in some embodiments, from 150 MPa to 300 MPa. The first IOX step is followed by a second IOX step, leading to a “spike” compressive stress CS2 after the second IOX step at the surface of greater than 500 MPa or, in some embodiments, 700 MPa. The width of the spike generated by the second IOX is between 1 ?m and 30 ?m, or between 8 ?m and 15 ?m, using the criteria where the magnitude (absolute value) of the slope of the spike is higher than 20 MPa/?m.

Abstract: Device for forming a glass article, including a forming mold for receiving a glass blank, and a gas injection device with a blowing head intended to be received in the mouth of the blank, the gas injection device including a pressurized gas inlet, a first injection channel connecting the pressurized gas inlet to at least one outlet port opening into the inside cavity, through a first control solenoid valve, with a first pressure sensor and a first temperature sensor, a vent channel connecting the inside cavity to the outside air, the vent channel being equipped with a second pressure sensor and a second temperature sensor, an electro-pneumatic control unit being configured to control the first control solenoid valve according to the pressure measurements and temperature measurements.

Abstract: A tempering station for the partial heat treatment of a metal component, which includes an apparatus for the heat treatment of a metal component, and the use of at least one tangential nozzle in a tempering station for the partial heat treatment of a metal component. The tempering station for partial heat treatment of the metallic component comprises a processing plane disposed in the tempering station, the component being able to be disposed in said plane, and at least one nozzle which points to the processing plane and is provided and adapted for discharging a fluid stream for cooling at least a first sub-area of the component, wherein the at least one nozzle is a tangential nozzle. The tempering station and the apparatus make it possible in particular to adjust, as reliably and/or precisely as possible, a transition region between the different heat-treated sub-areas of the component, in particular to keep said region as small as possible.

Abstract: Methods and a glass manufacturing system are described herein that impact compaction in a glass sheet. For instance, a method is described herein for impacting compaction in a glass sheet made by a glass manufacturing system. In addition, a glass manufacturing system is described herein which manufactures a glass sheet that meets a compaction target. Plus, a method is described herein for maintaining an uniform compaction between glass sheets made by different glass manufacturing systems.

Abstract: A mold shuttle positioning system in a glass sheet forming system includes a mold mounted on a support frame. A shuttle frame including a pair of generally parallel elongate beams for receiving and supporting the mold support frame thereon. At least one support wheel assembly including a wheel and a shuttle guide is mounted in proximity to each of the shuttle beams to position and support each one of the beams as the shuttle frame is moved to position the mold supported thereon at one of multiple desired processing locations. At least one mold guide is mounted on the support surface of one of the beams for receiving and fixing the position of the mold support frame relative to the shuttle frame to align and prevent movement of the mold support frame with respect to the shuttle frame in any direction as the mold support frame is supported thereon.

Abstract: A glass forming furnace includes a forming zone, a cleaning zone, a plurality of sealing doors, and a conveying channel. The forming zone includes a pressure device. The pressure device includes a servo motor, a push rod, and a mold pressurizing mechanism. The push rod is connected with the servo motor. The push rod includes an end notch and an embedded structure. The mold pressurizing mechanism includes an inlet notch. The inlet notch is connected with the embedded structure. Wherein, the end notch is in contact with the inlet notch. The cleaning zone includes an active brush mechanism. The sealing doors are disposed at an inlet and an outlet of the forming zone, respectively. The sealing doors each include a valve. The valve has a cross-sectional thickness that is gradually decreased from top to bottom. The conveying channel passes through the forming zone and the cleaning zone. The conveying channel is configured to convey a plurality of glass forming molds.

Abstract: Provided herein are titanium alloys that can achieve a combination of high strength and high toughness or elongation, and a method to produce the alloys. By tolerating iron, oxygen, and other incidental elements and impurities, the alloys enable the use of lower quality scrap as raw materials. The alloys are castable and can form ?-phase laths in a basketweave morphology by a commercially feasible heat treatment that does not require hot-working or rapid cooling rates. The alloys comprise, by weight, about 3.0% to about 6.0% aluminum, 0% to about 1.5% tin, about 2.0% to about 4.0% vanadium, about 0.5% to about 4.5% molybdenum, about 1.0% to about 2.5% chromium, about 0.20% to about 0.55% iron, 0% to about 0.35% oxygen, 0% to about 0.007% boron, and 0% to about 0.60% other incidental elements and impurities, the balance of weight percent comprising titanium.

Abstract: A method for producing a shaped glass article may include heating at least a portion of a mold-facing surface of the glass article to a forming temperature, shaping the glass article in a mold, and removing the multilayer coating from the glass article. The glass article may be coated with a multi-layer removable coating including an inner layer in contact with the glass article and an outer layer disposed over the inner layer. The mold may be in direct contact with the outer layer during shaping. The inner layer may include a first glass having a softening point of at least about 50° C. less than a softening point of the glass article. The outer layer may include a second glass having a softening point of at least about 50° C. greater than the softening point of the glass article.

Abstract: Chemically tempered lithium aluminosilicate glasses and methods of tempering are provided. The method allows fast tempering at moderate temperatures, which leads to a deep zone of surface tension with a high level of surface tension.

Abstract: Alkali aluminosilicate glasses that exhibit fast ion exchange performance and having low softening points that enable the glasses to be formed into non-planar, three-dimensional shapes. The glasses contain less than about 1 mol % of boron oxide and, in some embodiments, are substantially free of B2O3. Furthermore, these glasses have excess amounts of alkali oxides relative to both Al2O3 and P2O5, in order to improve melting behavior and ion exchange performance while still achieving sufficiently low softening points to allow for formability.

Abstract: The invention relates to a glass sheet having a boron- and lithium-free glass composition comprising the following in weight percentage, expressed with respect to the total weight of glass: 65?SiO2?78% 5?Na2O?20% 0?K2O<5% 1?Al2O3?4% 0?CaO<4.5% 4?MgO?12%; as well as a (CaO/MgO) ratio which is less than 1. The invention corresponds to an easy chemically-temperable soda-silica type glass composition, which is more suited for mass production than aluminosilicate glass, and therefore is available at low cost, and with a base glass/matrix composition that is close to or very similar to compositions already used in existing mass production.

Abstract: There is provided a tempered glass plate, wherein a thickness of the tempered glass plate is less than or equal to 2.7 mm, wherein on a surface of the tempered glass plate, a plurality of stress marks are formed, wherein a distance between closest stress marks of the plurality of stress marks is less than or equal to 20 mm, wherein the surface of the tempered glass plate includes a first virtual circle that is formed by connecting points that are separated from a center of one of the plurality of stress marks by 2.5 mm, wherein the tempered glass plate includes a non elastic-wave region that is not affected by an elastic-wave generated during fracturing, and wherein, in the non elastic-wave region, an average number of cracks that exist in the first virtual circle is greater than or equal to 3.4.

Abstract: In a substrate treatment process, substrates are moved by a transporting device in a transporting direction through a substrate treatment installation having a number of chambers. The substrates are moved by transporting sections of the transporting device driven independently of one another. The transporting sections are driven such that, if substrates dwell temporarily in the transporting section, they are moved back and forth. Stresses in a substrate brought about by differing inputs of heat as a result of both process-induced and malfunction-induced dwell times of the substrate in a chamber are reduced by compensating within the chamber for a structurally brought about input of heat into the substrate, varying periodically over the length of the chamber, during temporary dwelling of the substrate in the chamber by moving the substrate back and forth over at least one period of the heat input by a change of the transporting direction.

Abstract: A strengthened glass sheet product along with a process and an apparatus for strengthening a glass sheet are provided. The process comprises cooling the glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened glass sheets having improved breakage properties.

Abstract: A strengthened glass sheet product as well as process and an apparatus for producing the product. The process comprises cooling the glass sheet by non-contact thermal conduction for sufficiently long to fix a surface compression and central tension of the sheet. The process results in thermally strengthened glass sheets having improved breakage properties.

Abstract: A method comprising the claimed oven, blowing units, and heaters inside a blowing chamber in an oven where convection air is blown through nozzle rows and wherein a roll space and a suction space are separated with the help of pressure from each other by extending the length and/or width of a spacer plate which measures essentially larger than the length and/or width of a spacer plate or by arranging gaps or part which constricts the flow of the convection air between the roll space and the suction space where the gaps or part has an effect on the pressure of suction channels, suction channels extension, or of the suction space so that the convection air is sucked at least mainly from the rolls space through the mentioned suction channels, suction channels extension, and the suction space.

Abstract: An LED tube light having a substantially uniform exterior diameter from end to end is disclosed. It has a glass light tube with narrowly curved end regions at ends for engaging with end caps, in which outer diameter of each end cap is equal to outer diameter of light tube. LED tube light also include a thermal conductive ring. The narrowly curved end region is formed by glass tempering. End caps are joined to the light tube by sleeving over the rear end regions with a hot melt adhesive disposed between the rear end region, the transition region, the insulating tubular part and the thermal conductive ring. An outer diameter of thermal conductive ring is the same as the outer diameter of the main region of the light tube. The transition region is curved, and an outer diameter of rear end region is less than that of the main region.

Abstract: A glass quench apparatus according to the present disclosure includes lower and upper quench heads configured to supply upward and downward gas flows to a heated glass sheet, and each quench head has multiple quench fins for distributing gas. For each quench head, adjacent quench fins are spaced apart center to center by a distance in the range of 0.87 to 1.15 inches, and each quench fin has multiple outlet openings that each have a diameter in the range of 0.25 to 0.36 inches. Furthermore, for each quench fin, the outlet openings are configured to provide spaced apart impingement points on the glass sheet such that adjacent impingement points are spaced apart by a distance in the range of 0.82 to 1.15 inches.

Abstract: To provide a method for manufacturing a glass blank for magnetic disk and a method for manufacturing a glass substrate for magnetic disk, which are capable of producing a glass blank for magnetic disk having a good surface waviness by press forming, and a method for manufacturing a glass substrate for magnetic disk. A method for manufacturing a glass blank for magnetic disk, which includes a forming process of press-forming a lump of molten glass using a pair of dies, wherein in the forming process, press forming is performed using thermally equalizing means for reducing a difference in temperature in the press forming surface of the die during pressing of the molten glass.

Abstract: The present invention discloses a device for continuously processing vacuum glass member.

Abstract: A coated article is provided which may be heat treated (e.g., thermally tempered) in certain example instances. In certain example embodiments, the coated article includes a low-emissivity (low-E) coating having a zinc stannate based layer provided over a silver-based infrared (IR) reflecting layer, where the zinc stannate based layer is preferably located between first and second silver based IR reflecting layers. The zinc stannate based layer may be provided between and contacting (i) an upper contact layer of or including Ni and/or Cr (or Ti, or TiOx), and (ii) a layer of or including silicon nitride.

Abstract: High intensity plasma-arc heat sources, such as a plasma-arc lamp, are used to irradiate glass, glass ceramics and/or ceramic materials to strengthen the glass. The same high intensity plasma-arc heat source may also be used to form a permanent pattern on the glass surface—the pattern being raised above the glass surface and integral with the glass (formed of the same material) by use of, for example, a screen-printed ink composition having been irradiated by the heat source.

Abstract: A tempered glass according to one embodiment of the present invention is a tempered glass having a compression stress layer in a surface thereof, the tempered glass including as a glass composition, in terms of mass %, 45 to 75% of SiO2, 10 to 25% of Al2O3, 0 to 10% of B2O2, 0 to 8% of MgO, 0 to 20% of SrO+BaO, and 0 to 14% of Na2O. Herein, the term “SrO+BaO” refers to the total amount of SrO and BaO.

Abstract: A glass tempering furnace and a method for heating a glass sheet. The glass sheet is heated in the glass tempering furnace by blowing heating air on the top surface of the glass sheet, and the blowing distance of the heating air from the top surface of the glass sheet is adjusted.

Abstract: A method for cutting a tempered glass including the steps of strengthening a glass substrate to form, from a surface to the inside of the glass substrate, at least one compression stress layer and a tensile stress layer corresponding to the compression stress layer; removing a part of the glass substrate, wherein the compression stress layer is formed in the part of the glass substrate and a predetermined cutting path passes through the part of the glass substrate; and cutting the glass substrate along the predetermined cutting path.

Abstract: The invention relates to a method for heating glass sheets, and a glass tempering furnace. The glass sheets are heated by feeding them through a tempering furnace whereby the glass sheets are heated from above and below in the tempering furnace. The glass sheets are heated with blowing channels arranged substantially transverse in relation to the direction of travel of the glass sheets and with heating resistor rows arranged substantially transverse in relation to the direction of travel of the glass sheets. A heating resistor row has at least three separately controllable parts, and the temperature profile of the glass sheet is adjusted in the transverse direction by separately adjusting the different parts of the resistor row.

Abstract: An apparatus for manufacturing tempered glass. A transportation unit transports a glass substrate that is intended to be tempered. An ionizer ionizes alkali oxides in the glass substrate by radiating energy onto the glass substrate. A dielectric heating unit increases the temperature of the inner portion of the glass substrate in which the alkali oxides are ionized by the ionizer.

Abstract: An apparatus for manufacturing strengthened glass containers, and more particularly the construction and operation of a cooling tube mechanism in an apparatus for thermally strengthening glass containers in a glass container manufacturing line at a location intermediate the hot end and the cold end. Glass containers formed at an I. S. machine are conveyed through a special tempering Lehr that heats them uniformly to a high temperature that is short of temperatures at which they may become deformed. Subsequently, the glass containers are rapidly thermally strengthened in a cooling station in which the outer and inner surfaces including all areas of the glass containers are simultaneously cooled to a temperature below the Strain Point of the glass used in the glass containers, with the cooling tube mechanism being used to cool the inner surfaces of the glass containers.

Abstract: Provided are an apparatus and a method for manufacturing a vitreous silica crucible, which enable accurate measurement of a fume generation amount, prevention of deterioration of an inner surface property, and real-time control of a raw material melting state. Provided is an apparatus for manufacturing a vitreous silica crucible 50 by supplying silica powder into a mold 10 to form a silica powder layer 11, and heating and melting the silica powder layer 11 by arc discharge. The apparatus includes the mold 10 for defining an outer shape of a vitreous silica crucible, an arc discharge unit having a plurality of carbon electrodes 13 and a power-supply unit 40, and a fume-amount measurement unit 30 for detecting an amount of fumes 80 generated in the mold 10.

Abstract: A method of manufacturing of strengthened glass containers, and more particularly a method of thermally strengthening glass containers in a glass container manufacturing line at a location intermediate the hot end and the cold end. Glass containers formed at an I. S. machine are conveyed through a special tempering Lehr that heats them uniformly to a high temperature that is short of temperatures at which they may become deformed. Subsequently, the glass containers are subjected to a unique rapid thermal strengthening cooling process in which the outer and inner surfaces including all areas of the glass containers are simultaneously cooled to a temperature below the Strain Point of the glass used in the glass containers.

Abstract: An apparatus for manufacturing strengthened glass containers, and more particularly an apparatus for thermally strengthening glass containers in a glass container manufacturing line at a location intermediate the hot end and the cold end. Glass containers formed at an I. S. machine are conveyed through a special tempering Lehr that heats them uniformly to a high temperature that is short of temperatures at which they may become deformed. Subsequently, the glass containers are rapidly thermally strengthened in a cooling station in which the outer and inner surfaces including all areas of the glass containers are simultaneously cooled to a temperature below the Strain Point of the glass used in the glass containers.

Abstract: In certain example embodiments, a coated article includes a tungsten-doped zirconium based layer before heat treatment (HT). The coated article is heat treated sufficiently to cause the tungsten-doped zirconium oxide and/or nitride based layer to result in a tungsten-doped zirconium oxide based layer that is scratch resistant and/or chemically durable. The doping of the layer with tungsten has been found to improve scratch resistance.

Abstract: In certain example embodiments, a coated article includes a copper-doped zirconium based layer before heat treatment (HT). The coated article is heat treated sufficiently to cause the copper-doped zirconium oxide and/or nitride based layer to result in a copper-doped zirconium oxide based layer that is scratch resistant and/or chemically durable. The doping of the layer with copper has been found to improve scratch resistance.

Abstract: The method for tempering a glass sheet of the present invention comprises a heating step of heating the glass sheet to a temperature close to the softening point of the glass sheet, a quenching step of blowing a cooling medium to both surfaces in the thickness direction of the heated glass to cool it, and a pre-quenching step between the heating step and the quenching step and further has an internal heating substep of selectively heating the vicinity of the center portion in the thickness direction of the glass sheet at least in the quenching step, to create such a state that when the temperature at the center portion in the thickness direction of the glass sheet is close to the tempering point, the temperature at the surfaces in the thickness direction of the glass sheet is not higher than the annealing point.

Abstract: A convection heating furnace for a glass sheet, into which oven glass sheet (3) arrives along a hauling track, as on moving rolls (4), and said furnace further comprises of heating elements (12), in order to heat the air, which is blasted against glass sheet (3), a blaster and blast air channelling in order to blast said air against the glass sheet, and the blast air channelling has, elongated channels (1), into which at least a part of the blast air heating elements 12 are fitted, and each channel comprises air blasting means on its flank directed against the glass sheet (3). As air blast elements there are nozzle groups fixed on the channel (1) flank, where the nozzle group formed of sheet metal, as of two, into shape formed sheets joined together to form a casing, whereby said casing comprises one or several for blast air directed discharge channels (6), and the direction of air flow in said casing (2) is essentially in the same direction as in said discharge channels (6).

Abstract: A strengthened glass container or vessel such as, but not limited to, vials for holding pharmaceutical products or vaccines in a hermetic and/or sterile state. The strengthened glass container undergoes a strengthening process that produces compression at the surface and tension within the container wall. The strengthening process is designed such that the tension within the wall is great enough to ensure catastrophic failure of the container, thus rendering the product unusable, should sterility be compromised by a through-wall crack. The tension is greater than a threshold central tension, above which catastrophic failure of the container is guaranteed, thus eliminating any potential for violation of pharmaceutical integrity.

Abstract: An apparatus for manufacturing strengthened glass containers, and more particularly the construction and operation of a base cooling nozzle in an apparatus for thermally strengthening glass containers in a glass container manufacturing line at a location intermediate the hot end and the cold end. Glass containers formed at an I.S. machine are conveyed through a special tempering Lehr that heats them uniformly to a high temperature that is short of temperatures at which they may become deformed. Subsequently, the glass containers are rapidly thermally strengthened in a cooling station in which the outer and inner surfaces including all areas of the glass containers are simultaneously cooled to a temperature below the Strain Point of the glass used in the glass containers, with the base cooling nozzles being used to cool the bottoms of the glass containers.

Abstract: An apparatus for manufacturing strengthened glass containers, and more particularly the construction and operation of a bottom cooler in an apparatus for thermally strengthening glass containers in a glass container manufacturing line at a location intermediate the hot end and the cold end. Glass containers formed at an I.S. machine are conveyed through a special tempering Lehr that heats them uniformly to a high temperature that is short of temperatures at which they may become deformed. Subsequently, the glass containers are rapidly thermally strengthened in a cooling station in which the outer and inner surfaces including all areas of the glass containers are simultaneously cooled to a temperature below the Strain Point of the glass used in the glass containers, with the bottom coolers being used to cool the bottoms of the glass containers.

Abstract: A method of manufacturing of strengthened glass containers, and more particularly a method of thermally strengthening glass containers in a glass container manufacturing line while they are on a conveyor intermediate the hot end and the cold end. Glass containers formed at an I. S. machine are conveyed through a special tempering Lehr that heats them uniformly to a high temperature that is short of temperatures at which they may become deformed. Subsequently, the glass containers while being transported on a conveyor are subjected to a unique rapid thermal strengthening cooling process in which the outer and inner surfaces including all areas of the glass containers are simultaneously cooled to a temperature below the Strain Point of the glass used in the glass containers.

Abstract: Glass is heated from above and below while the glass resides on rolls (3) in a tempering furnace (1). The upper surface of the glass (4) is heated by hot air jets formed by sucking air from inside the furnace (1) and pressurizing the hot air and recycling it back to the upper surface of the glass. Air which has been taken from outside the furnace (1) and pressurized by a compressor (17) and heated is blown to the lower surface of the glass.

Abstract: A method of making a heat treated (HT) substantially transparent coated article to be used in shower door applications, window applications, tabletop applications, or any other suitable applications. Certain embodiments relate to a method of making a coated article including heat treating a glass substrate coated with at least layer of or including carbon (e.g., diamond-like carbon (DLC)) and an overlying protective film thereon. The protective film may be of or include both (a) an oxygen blocking or barrier layer, and (b) a release layer of or including zinc oxynitride (e.g., ZnOxNz). Following and/or during heat treatment (e.g., thermal tempering, or the like) the protective film may be entirely or partially removed.

Abstract: A sheet restrainer is used to restrain movement of continuously traveling glass sheet and includes arms on either side of the glass sheet. A driving device coupled to the arms moves the arms from a retracted position in which the arms are withdrawn from the glass sheet to an engaged position in which the arms are near the glass sheet and in alignment with each other. Rollers are connected to the arms and contact the glass sheet in the engaged position. A damping device applies an adjustable damping force to at least one of the arms dampening movement of the arm in the engaged position thereby restraining movement of the sheet. In a method of operation, the damping devices restrain angular and/or lateral movement of the sheet by transmitting movement of the sheet against the rollers into a resistive damping force of the damping devices.

Abstract: A method of making a strengthened glass article. The method includes altering the glass structure and subsequently creating a compressive layer extending from the surface of the glass to a depth of layer. In some embodiments, the structure is altered by heat treating the glass at a temperature that is less than the annealing point of the glass, and the compressive layer is formed by ion exchange. A strengthened glass article made by the method is also provided.

Abstract: A device for cooling sheets of glass by jets of air emitted by at least one nozzle in a form of a pipe, including a box supplying the nozzle with air, airflow ejected via an ejection orifice of the nozzle passing successively through a conical part, of which an internal section is reduced in a flow direction, and then through a cylindrical part including the ejection orifice, of which an internal section corresponds to a smallest internal section of the conical part and to an internal section of the ejection orifice. The cylindrical part of the nozzle has a length greater than 6 times the diameter of the ejection orifice. The device achieves a high level of heat exchange when the sheets of glass are cooled, which makes it possible to increase reinforcing effect on the glass and/or to reduce power of fans used to convey air through the nozzles.

Abstract: A glass sheet quench station (16) and method for quenching glass sheets includes quench control valves (55, 57) that are operated to reduce unnecessary quenching air and thereby provide efficiency in the quenching.

Abstract: Provided is a method of producing a tempered glass sheet, comprising applying tempering treatment to a glass sheet by increasing the content of SiO2 in terms of mass in a surface region of a glass sheet through application of thermal treatment to the glass sheet to 1.03 or more times that in an interior region positioned at a depth of 1 ?m from a surface of the glass sheet.