WO2020031811A1 - 板ガラスの製造方法 - Google Patents

板ガラスの製造方法 Download PDF

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Publication number
WO2020031811A1
WO2020031811A1 PCT/JP2019/030038 JP2019030038W WO2020031811A1 WO 2020031811 A1 WO2020031811 A1 WO 2020031811A1 JP 2019030038 W JP2019030038 W JP 2019030038W WO 2020031811 A1 WO2020031811 A1 WO 2020031811A1
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WO
WIPO (PCT)
Prior art keywords
glass
glass ribbon
temperature
cooling
molten
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PCT/JP2019/030038
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English (en)
French (fr)
Japanese (ja)
Inventor
正徳 中野
一樹 内田
和孝 小野
弘輝 石橋
Original Assignee
Ａｇｃ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ａｇｃ株式会社 filed Critical Ａｇｃ株式会社
Priority to JP2020535698A priority Critical patent/JPWO2020031811A1/ja
Priority to CN201980051753.6A priority patent/CN112533877A/zh
Priority to KR1020217002782A priority patent/KR20210042088A/ko
Publication of WO2020031811A1 publication Critical patent/WO2020031811A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/20—Composition of the atmosphere above the float bath; Treating or purifying the atmosphere above the float bath
    • C03B18/22—Controlling or regulating the temperature of the atmosphere above the float tank

Definitions

  • the present invention relates to a method for manufacturing a sheet glass.
  • Sheet glass is mainly manufactured by a continuous forming process such as a downdraw method and a float method (for example, Patent Documents 1 and 2).
  • a typical example of the downdraw method is the fusion method.
  • a molten glass obtained by melting a glass raw material is supplied to an upper part of a forming member (hereinafter, referred to as a “forming member”).
  • the shaped member has a substantially wedge shape with a downwardly pointed cross section, and the molten glass flows down along two opposing side surfaces of the shaped member.
  • the molten glass flowing down along both side surfaces merges and integrates at the lower end (referred to as a “merging point”) of the forming member, whereby a glass ribbon is formed.
  • the glass ribbon is pulled downward while being gradually cooled by a pulling member such as a roller, and cut into predetermined dimensions.
  • a glass ribbon is formed by transporting molten glass on molten tin. Thereafter, the glass ribbon is gradually cooled and cut into predetermined dimensions.
  • JP 2016-028005 A JP-B-48-20761
  • devitrification viscosity eta L 10 5 poises (dPa ⁇ ) This is because, in the case of glass of the order of s) or lower, the viscosity of the molten glass approaches the devitrification viscosity ⁇ L during molding, and the possibility of devitrification increases.
  • devitrification refers to a phenomenon in which glass is crystallized and becomes opaque
  • the devitrification viscosity ⁇ L means a viscosity at which molten glass is devitrified.
  • the temperature of the molten glass at the devitrification viscosity ⁇ L is referred to as the devitrification temperature TL .
  • the devitrification viscosity ⁇ L is selected so as to be sufficiently higher than the viscosity of the molten glass at the start of forming.
  • the devitrification temperature T L in the conventional method of manufacturing a glass sheet is selected to be sufficiently lower than the molding start temperature i.e. the working point T W.
  • the present invention has been made in view of such a background, and in the present invention, a sheet glass is continuously formed even from a molten glass having a relatively low devitrification viscosity ⁇ L , that is, a high devitrification temperature TL. It is an object of the present invention to provide a method for manufacturing a sheet glass, which is capable of producing a sheet glass.
  • a method for producing a sheet glass Melting glass raw materials to obtain a molten glass, From the molten glass, forming a glass ribbon, Gradually cooling the glass ribbon, Has,
  • a production method is provided in which the molten glass is cooled such that an average cooling rate from a devitrification temperature TL to a softening point T S of the glass sheet becomes 1500 ° C./min or more. Is done.
  • a method for manufacturing a sheet glass capable of continuously forming a sheet glass from molten glass having a relatively low devitrification viscosity ⁇ L , that is, a high devitrification temperature TL .
  • FIG. 3 is a diagram schematically showing a relationship between each step and a glass temperature in a manufacturing method according to an embodiment of the present invention. It is the figure which showed roughly the flow of the manufacturing method of the sheet glass by one Embodiment of this invention. It is the figure which showed typically an example of the method of cooling a glass ribbon in the manufacturing method of the sheet glass by one Embodiment of this invention. It is the figure which showed typically an example of another method of cooling a glass ribbon in the manufacturing method of the flat glass by one Embodiment of this invention.
  • the conventional float method has a melting step, a forming step, and a slow cooling step.
  • a glass raw material is melted in a melting furnace to produce a molten glass.
  • the molten glass in the melting furnace is supplied onto a molten tin bath to form a glass ribbon.
  • the glass ribbon is formed into a predetermined shape while being conveyed on the molten tin.
  • the annealing step the glass ribbon is annealed in an annealing furnace.
  • FIG. 1 schematically shows a typical relationship between each of the above steps and the glass temperature in the conventional float method.
  • the horizontal axis represents three steps of melting, molding, and slow cooling
  • the vertical axis represents the approximate temperature of the glass in each step. Also, for some characteristic glass temperatures, the approximate viscosity of the glass at that temperature is also shown. Note that the horizontal axis is arranged in the order in which the three steps are performed, and thus can be considered as a time axis.
  • the glass in the melting step is dissolved, the temperature of the molten glass (the viscosity of the glass, about 10 4 about poise) working point T W is equal to or greater than.
  • the molten glass is supplied to the molding step in the work point T W. In other words, the start of molding temperature in the molding step is T W.
  • the temperature of the glass ribbon is gradually cooled from the forming start temperature T W to the annealing point T A (the viscosity of the glass is about 10 13 poise) while moving on the tin bath. Therefore, the temperature at the time of molding is completed, a T A.
  • the glass ribbon enters the slow cooling process in the annealing point T A, is gradually cooled in the slow cooling step. Thereafter, the glass ribbon is cut to produce a sheet glass.
  • the working point T W is set such that the difference ⁇ T between the working point T W and the devitrification temperature TL is sufficiently large.
  • devitrification temperature T L there is a problem that can not be higher than T W near or working point.
  • the area below the confluence corresponds to the glass ribbon forming step.
  • the conventional sheet glass manufacturing method has a problem that it is difficult to form a glass having a low devitrification viscosity ⁇ L , that is, a glass having a relatively high devitrification temperature TL by a continuous process.
  • a method for manufacturing a sheet glass Melting glass raw materials to obtain a molten glass, From the molten glass, forming a glass ribbon, Gradually cooling the glass ribbon, Has,
  • a production method is provided, wherein the molten glass is cooled such that an average cooling rate from a devitrification temperature TL to a softening point T S of the glass sheet becomes 1500 ° C./min or more. Is done.
  • FIG. 2 schematically shows an example of the relationship between each step and the glass temperature in the method for manufacturing a sheet glass according to one embodiment of the present invention.
  • the horizontal axis represents three steps of melting, molding, and slow cooling
  • the vertical axis represents the approximate temperature of the glass in each step.
  • the horizontal axis is arranged in the order in which the three processes are performed, and thus can be considered as a time axis.
  • the change in the glass temperature in the melting step and the slow cooling step is the same as in the conventional melting step and slow cooling step (see FIG. ).
  • the molten glass is at a temperature of the working point T W, is supplied to the molding process.
  • the glass ribbon is at a temperature in the vicinity annealing point T A, is conveyed to the annealing step.
  • the temperature of the glass ribbon changes from the forming start temperature (working point T W ) to the forming completion temperature (annealing point T A ).
  • the glass ribbon in the forming step has a softening point T S (viscosity of the glass is about 107.65 poise) at least from the devitrification temperature TL . in a temperature range, the average cooling rate v i is rapidly cooled so that the 1500 ° C. / min or more.
  • the temperature range from the forming start temperature (working point T W ) of the glass ribbon to the softening point T S can be quickly passed. For this reason, it is possible to significantly shorten the time during which the molten glass passes through the region of the devitrification temperature TL . This also makes it possible to significantly suppress the possibility that the glass is devitrified during the forming process.
  • crystallization can be significantly suppressed even if a glass having a relatively high devitrification temperature TL is used as a raw material.
  • a glass having a relatively high devitrification temperature T L that is, a glass having a low devitrification viscosity ⁇ L can be continuously manufactured.
  • the profile of the glass temperature shown in FIG. 2 is simplified for explanation, and in one embodiment of the present invention, the process of manufacturing the sheet glass is not exactly the same as the profile shown in FIG. It is apparent to those skilled in the art that
  • annealing step of the glass ribbon is not necessarily initiated by annealing point T A.
  • Annealing step may be started from a high temperature or a temperature lower than the annealing point T A.
  • the width of the glass ribbon is reduced (hereinafter, referred to as a “width reduction phenomenon”). May occur. This is a phenomenon that occurs when the glass ribbon shrinks in the width direction due to surface tension.
  • Such a width reduction phenomenon may reduce the accuracy of the width dimension of the glass ribbon to be formed and further, the sheet glass to be manufactured.
  • the molten glass in the step of forming the glass ribbon, has an average cooling rate from the devitrification temperature TL of the glass sheet to the softening point T S of 1500 ° C. / Minute or more.
  • the sheet glass manufacturing method according to one embodiment of the present invention can obtain an additional effect that the width reduction phenomenon of the glass ribbon can be significantly suppressed. it can.
  • the width ⁇ W of the glass ribbon can be reduced to 50 mm or less.
  • W1 is the width of the glass ribbon immediately after the start of molding, that is, immediately after the start of free fall.
  • W2 is the width of the glass ribbon immediately after completion of molding.
  • W1 is the width of the glass ribbon at the viscosity at the molding start temperature
  • W2 is the width of the glass ribbon when the viscosity is about 107.65 poise.
  • the amount of reduction ⁇ W is preferably 40 mm or less.
  • FIG. 3 schematically shows a flow of a method for manufacturing a sheet glass (hereinafter, referred to as “first manufacturing method”) according to an embodiment of the present invention.
  • the first manufacturing method includes: (1) a step of melting a glass raw material to obtain a molten glass (step S110); (2) a step of forming a glass ribbon from the molten glass (step S120); (3) a step of gradually cooling the glass ribbon (step S130); (4) a step of cutting the gradually cooled glass ribbon to form a sheet glass (step S140); Having.
  • Step S110 First, a glass raw material for a sheet glass is prepared.
  • the composition of the glass raw material is not particularly limited. However, in the first manufacturing method, a glass raw material for a sheet glass having a composition having a relatively high devitrification temperature T L , that is, a low devitrification viscosity ⁇ L can also be used significantly.
  • the glass raw material is supplied to the melting furnace to form molten glass.
  • the melting temperature is not particularly limited, but may be, for example, a temperature at which the viscosity of the glass becomes 10 0 to 10 3 poise.
  • the devitrification temperature TL of the plate glass manufactured from the glass raw material may be 800 ° C. or higher, 850 ° C. or higher, or 900 ° C. or higher.
  • the difference between the devitrification temperature T L and the working temperature T W at which the viscosity becomes 10 4 dPa ⁇ s, T L ⁇ T w, is not particularly limited, but is preferably 0 ° C. or more, and is preferably 50 ° C. It is preferably at least 100 ° C., more preferably at least 100 ° C.
  • the softening point T S of the plate glass produced from the glass raw material is not particularly limited, but may be, for example, in the range of 400 ° C. to 1100 ° C.
  • the devitrification viscosity ⁇ L of the plate glass produced from the glass raw material is, for example, in the range of 1 ⁇ 10 0 to 1 ⁇ 10 5 dPa ⁇ s (poise), and 1 ⁇ 10 1.5 to 1 ⁇ 10 4 dPa. S (poise), more preferably 1 ⁇ 10 2 to 1 ⁇ 10 3 dPa ⁇ s (poise).
  • the molten glass in the melting furnace is then transferred to the forming process.
  • Step S120 Next, a molding step is performed. In this step, the molten glass transferred from the melting furnace is formed, and a glass ribbon is formed.
  • the molten glass, the average cooling rate v i from devitrification temperature T L to the softening point T S is cooled so that the 1500 ° C. / min or more.
  • the average cooling rate v i from devitrification temperature T L to the softening point T S is, for example, 1800 ° C. / min or more and 2000 ° C. / min or more.
  • the method of performing such “quenching” of the glass ribbon is not particularly limited.
  • the glass ribbon may be rapidly cooled by spraying a cooling gas on the glass ribbon.
  • a rapid cooling method is particularly referred to as a “gas blow cooling method”.
  • the gas used in the gas blow cooling method is not particularly limited as long as it does not adversely affect the glass ribbon.
  • an inert gas such as argon and nitrogen, or air may be used as the cooling gas.
  • the temperature of the blown gas is preferably lower than the softening point T S of the molten glass.
  • the temperature of the blown gas be lower by 1 ° C. to 100 ° C. than the softening point T S of the molten glass.
  • FIG. 4 schematically shows an example of a configuration of an apparatus used for cooling a glass ribbon by a gas blow cooling method.
  • the device 100 has a housing member 110 and a gas supply member 125.
  • the housing member 110 has an upper member 112 and a bottom member 115.
  • the upper member 112 has an upper surface 112a and four side surfaces 112b surrounding the upper surface 112a.
  • a concave portion 114 whose upper side is opened is formed in the upper surface 112a.
  • the two opposing side surfaces 112b extend parallel to each other in a vertical direction (a downward direction on the paper) and in a direction perpendicular to the paper.
  • the bottom member 115 of the housing member 110 has a substantially inverted triangular cross section, and has two slopes 116a and 116b and an apex 116c connecting both slopes.
  • the first inclined surface 116a, the second inclined surface 116b, and the apex 116c also extend in a direction perpendicular to the paper surface, and therefore, the lower portion of the housing member 110 has a substantially triangular prism shape.
  • the upper part of the first slope 116a is connected to one side surface 112b of the upper member 112, and the upper part of the second slope 116b is connected to one side surface 112b of the upper member 112.
  • the gas supply member 125 has one or more nozzles.
  • the gas supply member 125 includes a first set of nozzles 127a and 127b arranged at symmetric positions and a second set of nozzles 129a and 129b arranged at symmetric positions.
  • the first set of nozzles 127a and 127b and the second set of nozzles 129a and 129b are installed at mutually different heights.
  • the gas supply member 125 has a total of four nozzles 127a, 127b, 129a, and 129b.
  • the molten glass 150 is supplied to the concave portion 114 of the upper member 112 of the housing member 110.
  • the recess 114 accommodates the molten glass 150. However, when the molten glass 150 that exceeds the storage volume of the recess 114 is supplied, the molten glass 150 overflows along the opposite side surface 112b of the storage member 110, and the first molten glass portion 152a and the second molten glass 150 It becomes the part 152b.
  • the first molten glass portion 152a flows further downward along the first slope 116a of the housing member 110.
  • the second molten glass portion 152b flows further downward along the second slope 116b of the housing member 110.
  • the first molten glass portion 152a and the second molten glass portion 152b reach the vertex 116c and are integrated there.
  • the combined molten glass becomes a glass ribbon 170 and further extends in the vertical direction. That is, the vertex 116c is the molding start position, and the molding of the glass ribbon 170 is started from here.
  • the apparatus 100 has the gas supply member 125 at a position close to the glass ribbon 170, particularly at a position where the forming is started (the vertex 116 c).
  • a cooling gas is blown toward the glass ribbon 170 from each of the nozzles 127a, 127b, 129a, and 129b of the gas supply member 125.
  • the apparatus 100 can rapidly cool the glass ribbon 170 immediately after the start of forming the molten glass 150.
  • the configuration example of the apparatus 100 shown in FIG. 4 is merely an example, and the gas blow cooling method may be performed using another apparatus.
  • the glass ribbon may be rapidly cooled by continuously bringing the glass ribbon into contact with the cooled roll.
  • a rapid cooling method is referred to as a “roll cooling method”.
  • the roll cooling method for example, it is preferable to use a roll maintained at a sufficiently low temperature.
  • the temperature of the roll is lower than the softening point T S of the molten glass.
  • the temperature of the roll is 1 ° C. to 100 ° C. lower than the softening point T S of the molten glass.
  • Examples of the method for cooling the roll include water cooling, air cooling, and oil cooling in which low-temperature water, gas, and oil are circulated for cooling.
  • FIG. 5 schematically shows an example of a configuration of an apparatus used for cooling a glass ribbon by a roll cooling method.
  • the apparatus 300 for performing the roll cooling method includes the housing member 310 and at least one pair of cooling rolls 360.
  • the apparatus 300 further includes a transport roller and an annealing furnace downstream of the cooling roll 360.
  • the transport roller has a role of drawing out the glass ribbon 370 sent from the cooling roll 360 and introducing the glass ribbon 370 into the lehr.
  • the storage member 310 has a role of storing the molten glass 350 supplied from a melting furnace (not shown) and overflowing the molten glass 350 that could not be stored downward.
  • the housing member 310 may have a form like the housing member 110 shown in FIG. 4 described above.
  • the molten glass 350 is supplied to the upper part of the housing member 310.
  • the glass ribbon 370 flows further downward and is supported by being sandwiched between the two cooling rolls 360.
  • the cooling roll 360 is maintained at a predetermined temperature by water, gas, oil, or the like, and the glass ribbon 370 in contact with the cooling roll 360 is rapidly cooled here.
  • a transport roller (not shown) is provided downstream of the cooling roll 360. With this transport roller, the glass ribbon 370 is pulled out to the downstream side of the cooling roll 360 and introduced into the lehr.
  • the glass ribbon 370 introduced into the annealing furnace is gradually cooled, and when it reaches a predetermined temperature, is cut into a predetermined size to produce a sheet glass.
  • the glass ribbon 370 can be rapidly cooled using the cooling roll 360.
  • a method of spraying a liquid onto molten glass there is a method of spraying a liquid onto molten glass.
  • a glass ribbon can be rapidly cooled by using a relatively vaporizable liquid as a spray liquid at a forming temperature of the molten glass (working point T W ) or a temperature region in the vicinity thereof.
  • a rapid cooling method is particularly referred to as a “liquid spray cooling method”.
  • Liquids that can be used in the liquid spray cooling method include, for example, water, ethanol, acetone, and the like. These liquids are less likely to adversely affect the glass ribbon, even when in contact with the glass ribbon.
  • the temperature of the liquid to be sprayed is preferably lower than the softening point T S of the molten glass.
  • the glass ribbon may be rapidly cooled by continuously dropping the glass ribbon onto a molten metal bath.
  • the molten metal serving as a cooling source includes, but is not limited to, tin, lead, zinc, mercury, copper, and the like.
  • the molten metal may be a single metal or an alloy of two or more selected from the above-described metal group.
  • the temperature of the molten metal is preferably lower than the softening point T S of the molten glass.
  • the temperature of the molten metal is 1 ° C. to 100 ° C. lower than the softening point T S of the molten glass.
  • the molten glass is quenched and the glass ribbon is formed by the above method.
  • Such rapid cooling of the glass ribbon in the forming step significantly reduces the time for the molten glass to pass through the devitrification temperature TL . Further, as a result, even when a sheet glass is manufactured from glass having a relatively high devitrification temperature T L , that is, a glass having a low devitrification viscosity ⁇ L , there is a possibility that a devitrification phenomenon occurs in the glass ribbon in the forming process. It can be suppressed significantly.
  • Step S130 Next, the formed glass ribbon is gradually cooled. Usually, this step is performed in a lehr.
  • the temperature of the glass ribbon to be supplied to the annealing furnace is a front and rear annealing point T A. This is about 10 13 poise in terms of the viscosity of glass.
  • the annealing point T A is, for example, in the range of 450 ° C. to 700 ° C.
  • Step S140 Thereafter, the glass ribbon is cut to predetermined dimensions.
  • the refractive index of the manufactured glass sheet may be, for example, in the range of 1.40 to 2.20.
  • a high refractive index when required, it is preferably 1.60 or more, more preferably 1.65 or more, still more preferably 1.70 or more, and particularly preferably 1.75 or more.
  • Such a high-refractive-index plate glass can be applied to, for example, a video display device such as a high-performance liquid crystal panel, a light extraction member of a light emitting device, and the like.
  • low dispersion or anomalous dispersion, filter applications to cut a specific wavelength for example, when it is necessary to cut light in the near infrared region, 1.50 or less, preferably 1.48 or less, 1.45 or less is more preferable.
  • a low-refractive-index glass can be used for correcting visibility in an image pickup device and correcting chromatic aberration of an image pickup optical system.
  • the manufactured sheet glass may have a Young's modulus in a range of, for example, 90 GPa to 150 GPa.
  • the Young's modulus is preferably 95 GPa or more, more preferably 100 GPa or more, further preferably 105 GPa or more, and particularly preferably 110 GPa or more.
  • Such a glass can be applied to, for example, a substrate of a magnetic disk for information recording, a substrate for a display, a support glass for semiconductor packaging, a carrier glass for a fan-out process, a cover glass for a mobile information device, and the like. it can.
  • Example 1 A production test of a sheet glass was performed by the following method.
  • FIG. 4 schematically shows a part of a plate glass manufacturing apparatus used for the test.
  • the device 100 includes a housing member 110 and a gas supply member 125. Although not shown in FIG. 4, the apparatus 100 further includes a slow cooling unit downstream of the gas supply member 125.
  • the storage member 110 has a role of storing the molten glass supplied from the melting furnace (not shown) and overflowing the molten glass that cannot be stored downward.
  • the molten glass 150 is supplied to the upper part of the housing member 110.
  • the molten glass 150 is supplied to the concave portion 114 of the upper member 112 of the housing member 110.
  • the recess 114 accommodates the molten glass 150. However, the molten glass 150 that exceeds the storage volume of the concave portion 114 is supplied, and the molten glass 150 overflows along the opposite side surface 112b of the storage member 110, and the first molten glass portion 152a and the second molten glass portion 152b.
  • the first molten glass portion 152a flows further downward along the first slope 116a of the housing member 110.
  • the second molten glass portion 152b flows further downward along the second slope 116b of the housing member 110.
  • the first molten glass portion 152a and the second molten glass portion 152b reach the vertex 116c and are integrated there.
  • the combined molten glass becomes a glass ribbon 170 and further extends in the vertical direction. That is, the vertex 116c is the molding start position, and the molding of the glass ribbon 170 is started from here.
  • a cooling gas is blown toward the glass ribbon 170 from each of the nozzles 127a, 127b, 129a, and 129b of the gas supply member 125 installed at a position close to the molding start position (apex 116c). Quench quickly.
  • the positions and shapes of the nozzles 127a, 127b, 129a, and 129b are adjusted such that the cooling gas is blown over the glass ribbon 170 over a region of 100 mm in the vertical direction.
  • the rapidly cooled glass ribbon 170 is introduced into the slow cooling unit.
  • the glass ribbon 170 introduced into the slow cooling section is gradually cooled, and when it reaches a predetermined temperature, is cut into a predetermined size to produce a sheet glass.
  • the temperature of the molten glass 150 supplied to the housing member 110 was about 1100 ° C.
  • the temperature of the molten glass 150 (glass ribbon 170) at the vertex 116c (hereinafter, referred to as “T 1 (° C.)”) was 1,060 ° C.
  • the transport speed of the glass ribbon 170 at this time was 300 mm / min. At this time, the thickness of the glass ribbon 170 was about 3.0 mm.
  • the temperature of the glass ribbon 170 immediately after passing between the nozzles of the gas supply member 125 was 660 ° C.
  • the time when the glass ribbon 170 is at the vertex 116c is set to a zero point (t 1 ), and the temperature immediately after the glass ribbon 170 passes between the nozzles of the gas supply member (hereinafter, “T 2 (° C.)”) ), That is, the time required to reach 660 ° C. (referred to as “t 2 (minute)”).
  • the second average cooling rate v ii was 2100 ° C./min.
  • the width ⁇ W of the glass ribbon 170 determined as described above was measured, the width ⁇ W was 25 mm.
  • Example 2 A production test of a sheet glass was carried out in the same manner as in Example 1.
  • Example 2 the transport speed of the glass ribbon 170 was 400 mm / min. At that time, the thickness of the glass ribbon 170 was about 2.2 mm. Other conditions are the same as in the case of Example 1.
  • the second average cooling rate v ii obtained from the above equation (1) was 2350 ° C./min.
  • the amount of width ⁇ W of the glass ribbon 170 was 27 mm.
  • Example 3 A production test of a sheet glass was carried out in the same manner as in Example 1.
  • Example 3 the transfer speed of the glass ribbon 170 was set to 600 mm / min. At that time, the thickness of the glass ribbon 170 was about 1.5 mm. Other conditions are the same as in the case of Example 1.
  • the second average cooling rate v ii obtained from the above equation (1) was 2850 ° C./min.
  • the width reduction ⁇ W of the glass ribbon 170 was 32 mm.
  • Example 4 A production test of a sheet glass was performed by the following method.
  • the temperature of the molten glass 350 supplied to the housing member 310 was about 1100 ° C.
  • the temperature of the molten glass 350 (glass ribbon 370) at the junction 320 (hereinafter, referred to as “T 1 (° C.)”) was 1,060 ° C.
  • the surface temperature of the two cooling rolls 360 was maintained at 660 ° C., and the transport speed of the glass ribbon 370 on the surface of the cooling rolls 360 was 300 mm / min.
  • the thickness of the glass ribbon 370 conveyed between the two cooling rolls 360 was about 3.0 mm.
  • the time when the glass ribbon 370 is at the junction 320 is set to a zero point (t 1 ), and the temperature of the glass ribbon 370 is the temperature of the cooling roll 360 (hereinafter, referred to as “T 2 (° C.)”); That is, the time required to reach 660 ° C. (referred to as “t 2 (minute)”) was measured.
  • the glass ribbon 370 is in a position in direct contact with the cooling roll 360, immediately after contact with the cooling roll 360, is quenched to a temperature T 2 of the said cooling roll 360.
  • the time until the surface temperature of the glass ribbon 370 becomes substantially equal to the temperature T 2 of the cooling roll 360 is defined as t 2 (minutes).
  • the second average cooling rate v ii was 2350 ° C./min.
  • the amount of width ⁇ W of the glass ribbon 370 was 20 mm.
  • Example 5 A production test of a sheet glass was performed in the same manner as in Example 4.
  • Example 5 the transport speed of the glass ribbon 370 was 400 mm / min. At that time, the thickness of the glass ribbon 370 was about 2.2 mm.
  • the other conditions are the same as in Example 4.
  • the second average cooling rate v ii obtained from the above equation (1) was 3200 ° C./min.
  • the amount of width ⁇ W of the glass ribbon 370 was 24 mm.
  • Example 6 A production test of a sheet glass was performed in the same manner as in Example 4.
  • Example 6 the transport speed of the glass ribbon 370 was set to 600 mm / min. At that time, the thickness of the glass ribbon 370 was about 1.5 mm.
  • the other conditions are the same as in Example 4.
  • the second average cooling rate v ii obtained from the above equation (1) was 4000 ° C./min.
  • the width reduction ⁇ W of the glass ribbon 370 was 29 mm.
  • Example 7 A sheet glass production test was performed in the same manner as in Example 1 except that the glass ribbon was cooled using a molten tin bath instead of the gas supply member. The temperature of the molten tin was maintained at 660 ° C., and the transport speed of the glass ribbon on the surface of the molten tin bath was 410 mm / min. The thickness of the glass ribbon was about 2.2 mm.
  • the second average cooling rate v ii obtained from the above equation (1) was 1800 ° C./min.
  • the amount of width ⁇ W of the glass ribbon was 25 mm.
  • Example 8 A production test of a sheet glass was carried out in the same manner as in Example 1.
  • Example 8 the shape and position of each nozzle and the supply amount of the cooling gas discharged from each nozzle were adjusted so that the cooling gas was blown over the region of the glass ribbon 170 in the vertical direction of 20 mm.
  • the supply amount of the cooling gas per unit area is the same as in Example 1.
  • the transfer speed of the glass ribbon 170 was 600 mm / min. At that time, the thickness of the glass ribbon 170 was about 2.3 mm.
  • Other conditions are the same as in the case of Example 1.
  • the second average cooling rate v ii obtained from the above equation (1) was 420 ° C./min.
  • the width ⁇ W of reduction of the glass ribbon was 85 mm.
  • the average cooling rate v i from devitrification temperature T L of the glass ribbon to the softening point T S can to 1500 ° C. / min or more was confirmed. Further, even when the working point T W (or molding start temperature T 1) and the devitrification temperature T L is closer, by an average cooling rate v i of the glass ribbon between 1500 ° C. / min or more, It was confirmed that the crystallization of the molten glass was suppressed.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Glass Compositions (AREA)
PCT/JP2019/030038 2018-08-09 2019-07-31 板ガラスの製造方法 WO2020031811A1 (ja)

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WO2023112731A1 (ja) * 2021-12-17 2023-06-22 日本電気硝子株式会社 ガラス物品の製造装置及び製造方法

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JP2009502706A (ja) * 2005-07-21 2009-01-29 コーニング インコーポレイテッド 制御された冷却を用いた板ガラス製造方法
WO2012133838A1 (ja) * 2011-03-31 2012-10-04 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法
WO2014178354A1 (ja) * 2013-04-30 2014-11-06 Hoya株式会社 情報記録媒体用ガラス基板の製造方法

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JPS4820761B1 (zh) 1970-11-19 1973-06-23
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JP5327702B2 (ja) * 2008-01-21 2013-10-30 日本電気硝子株式会社 ガラス基板の製造方法
JP2016028005A (ja) 2015-07-16 2016-02-25 ＡｖａｎＳｔｒａｔｅ株式会社 ガラスシートの製造方法、ガラスシート製造装置、及びガラス積層体

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JP2009502706A (ja) * 2005-07-21 2009-01-29 コーニング インコーポレイテッド 制御された冷却を用いた板ガラス製造方法
WO2012133838A1 (ja) * 2011-03-31 2012-10-04 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法
WO2014178354A1 (ja) * 2013-04-30 2014-11-06 Hoya株式会社 情報記録媒体用ガラス基板の製造方法

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WO2023112731A1 (ja) * 2021-12-17 2023-06-22 日本電気硝子株式会社 ガラス物品の製造装置及び製造方法

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