WO2013073352A1 - 支持ロール、支持ロールを有する板ガラスの成形装置、および支持ロールを用いた板ガラスの成形方法 - Google Patents

支持ロール、支持ロールを有する板ガラスの成形装置、および支持ロールを用いた板ガラスの成形方法 Download PDF

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Publication number
WO2013073352A1
WO2013073352A1 PCT/JP2012/077520 JP2012077520W WO2013073352A1 WO 2013073352 A1 WO2013073352 A1 WO 2013073352A1 JP 2012077520 W JP2012077520 W JP 2012077520W WO 2013073352 A1 WO2013073352 A1 WO 2013073352A1
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Prior art keywords
molten glass
support roll
rotating member
glass ribbon
mass
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PCT/JP2012/077520
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English (en)
French (fr)
Japanese (ja)
Inventor
成明 富田
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旭硝子株式会社
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Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Priority to JP2013544198A priority Critical patent/JP6127978B2/ja
Priority to KR1020147007121A priority patent/KR102002655B1/ko
Priority to CN201280051763.8A priority patent/CN103889910A/zh
Publication of WO2013073352A1 publication Critical patent/WO2013073352A1/ja

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    • 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
    • C03B18/04—Changing or regulating the dimensions of the molten glass ribbon
    • C03B18/06—Changing or regulating the dimensions of the molten glass ribbon using mechanical means, e.g. restrictor bars, edge rollers
    • 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
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
    • 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 support roll, a sheet glass forming apparatus having the support roll, and a sheet glass forming method using the support roll.
  • the float method is widely used as a method for forming sheet glass.
  • the float method is a method in which molten glass introduced on a molten metal (for example, molten tin) accommodated in a bathtub is caused to flow in a predetermined direction to form a strip-shaped molten glass ribbon. After the molten glass ribbon is cooled in the process of flowing in the horizontal direction, it is pulled up from the molten metal by a lift-out roll and is gradually cooled in a slow cooling furnace to become a sheet glass. After the plate glass is unloaded from the slow cooling furnace, it is cut into a predetermined size and shape by a cutting machine to become a product plate glass.
  • molten metal for example, molten tin
  • a fusion method is also known.
  • the molten glass overflowing from the upper edges of the left and right sides of the bowl-shaped member is allowed to flow along the left and right sides of the bowl-shaped member, and is joined at the lower edge where the left and right sides meet.
  • This is a method of forming a molten glass ribbon.
  • the molten glass ribbon is gradually cooled while moving downward in the vertical direction to form a sheet glass.
  • the plate glass is cut into a predetermined dimensional shape by a cutting machine to become a plate glass as a product.
  • the molten glass ribbon in a state thinner than the equilibrium thickness tends to shrink in the width direction. If the molten glass ribbon contracts in the width direction, the thickness of the plate glass that is the product becomes thicker than the target thickness. This problem becomes more prominent as the target thickness decreases.
  • a support roll for supporting the molten glass ribbon has been used (for example, see Patent Document 1).
  • a plurality of pairs of support rolls are disposed on both sides in the width direction of the molten glass ribbon, and tension is applied to the molten glass ribbon in the width direction.
  • the support roll has a rotating member in contact with the surface of the molten glass ribbon at the tip. As the rotating member rotates, the molten glass ribbon is sent out in a predetermined direction.
  • the rotating member of the support roll is formed in a disk shape with a metal material such as steel or a heat-resistant alloy, and a chrome plating layer or the like may be applied to a portion of the rotating member that contacts the molten glass ribbon.
  • the rotating member has gear-shaped irregularities on the outer peripheral portion in contact with the molten glass ribbon so that the molten glass ribbon can be easily supported.
  • the rotating member of the support roll since the rotating member of the support roll is formed of a metal material, it has a refrigerant channel inside so as not to be overheated by contact with the molten glass ribbon. Since the refrigerant flows inside the rotating member, the molten glass ribbon is strongly cooled in the vicinity of the rotating member. For this reason, the temperature of the molten glass ribbon, and hence the thickness of the molten glass ribbon, tends to become unstable, and the flatness of the plate glass as a product may be impaired.
  • the rotating member since the molten glass ribbon is strongly cooled and hardened in the vicinity of the rotating member, the rotating member is difficult to bite into the molten glass ribbon, and the molten glass ribbon may not be supported (grip).
  • the grip property tends to be a problem because the temperature of the molten glass ribbon is low.
  • This invention was made in view of the said subject, Comprising: It aims at providing the support roll which can improve the flatness of the plate glass which is a product, and the grip property with respect to a molten glass ribbon.
  • a rotating member that contacts the molten glass ribbon is provided at a tip portion. And the rotating member does not have a coolant channel inside, and a support roll formed of ceramics is provided.
  • a support roll capable of improving the flatness of a plate glass as a product and the grip performance with respect to a molten glass ribbon.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is a front view which shows the support roll by one Embodiment of this invention.
  • FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG. 3. It is a front view which shows the modification (1) of a rotating member.
  • FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. It is a front view which shows the modification (2) of a rotating member. It is a front view which shows the modification (3) of a rotating member. It is a front view which shows the modification (4) of a rotation member. It is a front view which shows the modification (5) of a rotation member. 6 is a graph showing changes over time in wettability of a sintered body with respect to molten glass in Examples 1 to 4.
  • FIG. 1 is a partial cross-sectional view showing a sheet glass forming apparatus according to an embodiment of the present invention.
  • FIG. 2 is a sectional view taken along line II-II in FIG.
  • the sheet glass forming apparatus 10 has a float bath 20.
  • the float bath 20 is connected to the bathtub 22 that houses the molten metal (for example, molten tin) S, the side wall 24 that is installed along the outer peripheral upper edge of the bathtub 22, and the ceiling 26 that covers the upper side of the bathtub 22.
  • the ceiling 26 is provided with a gas supply path 30 for supplying a reducing gas in a space 28 formed between the bathtub 22 and the ceiling 26.
  • a heater 32 as a heating source is inserted into the gas supply path 30, and a heat generating portion 32 a of the heater 32 is disposed above the bathtub 22.
  • the forming method using the forming apparatus 10 is a method of making a molten glass ribbon G having a strip shape by causing molten glass introduced on a molten metal (for example, molten tin) S to flow in a predetermined direction.
  • the molten glass ribbon G is cooled in the process of flowing in a predetermined direction (X direction in FIG. 2), then pulled up from the molten tin S by a lift-out roll, and gradually cooled in a slow cooling furnace to become a sheet glass.
  • the plate glass is unloaded from the slow cooling furnace, and then cut into a predetermined size and shape by a cutting machine to become a plate glass as a product.
  • the space 28 in the float bath 20 is filled with a reducing gas supplied from the gas supply path 30 in order to prevent the molten tin S from being oxidized.
  • the reducing gas contains, for example, 1 to 15% by volume of hydrogen gas and 85 to 99% by volume of nitrogen gas.
  • the space 28 in the float bath 20 is set to a pressure higher than the atmospheric pressure in order to prevent air from entering through the gaps between the side walls 24 and the like.
  • a plurality of heaters 32 are provided at intervals in the flow direction (X direction) and the width direction (Y direction) of the molten glass ribbon G, and are arranged in a matrix. ing.
  • the output of the heater 32 is controlled such that the temperature of the molten glass ribbon G increases toward the upstream side in the flow direction (X direction) of the molten glass ribbon G.
  • the output of the heater 32 is controlled so that the temperature of the molten glass ribbon G is uniform in the width direction (Y direction).
  • the sheet glass forming apparatus 10 includes a support roll 40 that supports the molten glass ribbon G in order to prevent the molten glass ribbon G in the float bath 20 from shrinking in the width direction.
  • a support roll 40 that supports the molten glass ribbon G in order to prevent the molten glass ribbon G in the float bath 20 from shrinking in the width direction.
  • a plurality of pairs of support rolls 40 are arranged on both sides in the width direction of the molten glass ribbon G, and tension is applied to the molten glass ribbon G in the width direction (Y direction in the figure).
  • the support roll 40 has a rotating member 50 in contact with the molten glass ribbon G at the tip.
  • the rotating member 50 supports the end of the molten glass ribbon G in the width direction so that the molten glass ribbon G does not contract in the width direction by biting into or contacting the upper surface of the molten glass ribbon G.
  • the rotating member 50 rotates, the molten glass ribbon G is sent out in a predetermined direction.
  • FIG. 3 is a front view showing a support roll according to an embodiment of the present invention.
  • 4 is a partial cross-sectional view taken along line IV-IV in FIG.
  • the support roll 40 is mainly composed of a rotating member 50, an attaching member 60 to which the rotating member 50 is attached, and a shaft member 70 integrated with the attaching member 60.
  • a rotating member 50 an attaching member 60 to which the rotating member 50 is attached
  • a shaft member 70 integrated with the attaching member 60.
  • the shaft member 70 has a coolant channel inside, is cooled by the coolant flowing through the coolant channel, and may be formed of a metal material such as steel or a heat-resistant alloy. A heat insulating material (not shown) or the like may be wound around the outer periphery of the shaft member 70.
  • the shaft member 70 is, for example, a double pipe, and includes an inner pipe and an outer pipe.
  • a refrigerant flow path is constituted by the inner space of the inner tube and the space formed between the outer peripheral surface of the inner tube and the inner peripheral surface of the outer tube.
  • the refrigerant a liquid such as water or a gas such as air is used.
  • the refrigerant passes through the space formed between the outer peripheral surface of the inner pipe and the inner peripheral surface of the outer pipe to the outside. Discharged.
  • the refrigerant discharged to the outside may be cooled by a cooler and returned to the inner space of the inner pipe again. Note that the flow direction of the refrigerant may be in the opposite direction.
  • the shaft member 70 passes through the side wall 24, and is connected to a drive device 34 constituted by a motor, a speed reducer, and the like outside the float bath 20.
  • a drive device 34 constituted by a motor, a speed reducer, and the like outside the float bath 20.
  • the shaft member 70, the attachment member 60, and the rotation member 50 are integrally rotated around the central axis of the shaft member 70.
  • the attachment member 60 is integrated with the shaft member 70, and may have an inner space (not shown) that communicates with the refrigerant flow path of the shaft member 70. Since the coolant flows in the inner space, the attachment member 60 may be formed of a metal material such as steel or a heat-resistant alloy.
  • the rotation member 50 is detachably attached to the attachment member 60.
  • the attachment member 60 includes a shaft portion 62 that is integrated with the shaft member 70, an annular flange portion 63 that protrudes radially outward from the tip portion of the shaft portion 62, and a tip portion of the shaft portion 62.
  • the shaft portion 62 and the rod portion 64 extending coaxially are integrally provided.
  • the shaft portion 62 is abutted against the shaft member 70 and integrated by welding, for example.
  • the shaft portion 62 may be provided with a coolant channel (not shown) that communicates with the coolant channel of the shaft member 70.
  • the flange portion 63 protrudes outward in the radial direction of the shaft portion 62 from the tip end portion (the end portion opposite to the shaft member 70) of the shaft portion 62.
  • the flange portion 63 may be provided with a coolant channel (not shown) that communicates with the coolant channel of the shaft member 70.
  • the rod portion 64 extends coaxially with the shaft portion 62 from the tip portion of the shaft portion 62.
  • the rod portion 64 may be provided with a coolant channel (not shown) that communicates with the coolant channel of the shaft member 70.
  • the rod portion 64 penetrates the rotating member 50 and has a male screw portion at the tip. The movement of the rotating member 50 in the axial direction is restricted by the nut 41 screwed to the male screw portion and the flange portion 63. By removing the nut 41 from the male screw portion, the rotating member 50 can be removed.
  • the attachment member 60 has shaft portions 67 and 68 that are fixed to the surface on the front end side of the flange portion 63 and are parallel to the central axis of the rod portion 64.
  • the attachment members 60 and the rotation member 50 can be rotated integrally by the shaft portions 67 and 68 and the rod portion 64.
  • each of the shaft portions 67 and 68 penetrates the rotating member 50 and has a male screw portion at the tip.
  • the nuts 42 and 43 screwed to the male screw portion and the flange portion 63 restrict the movement of the rotating member 50 in the axial direction.
  • the rotating member 50 can be removed by removing the nuts 42 and 43 from the male screw portion.
  • the rotating member 50 has a disk shape, and the central axis of the rotating member 50 and the central axis of the shaft member 70 are on the same straight line.
  • the rotating member 50 contacts the surface of the molten glass ribbon G (the upper surface in the present embodiment) at the outer peripheral portion 51. As the rotating member 50 rotates, the molten glass ribbon G is sent out in a predetermined direction.
  • Rotating member 50 has gear-like irregularities 52 on outer peripheral portion 51, for example, as shown in FIG.
  • the unevenness 52 makes it easy for the rotating member 50 to bite into the molten glass ribbon G.
  • corrugation 52 is not specifically limited, For example, as shown in FIG. 3, you may form in a taper shape (for example, square pyramid shape).
  • the gear-shaped irregularities 52 are formed in a row on the outer peripheral portion 51 of the rotating member 50, but a plurality of rows may be formed.
  • Rotating member 50 does not have a coolant channel inside and is formed of ceramics. Ceramics has a high temperature strength higher than that of conventional metals such as steel and heat-resistant alloys, so that the conventionally required refrigerant flow path is not required. Therefore, since the refrigerant does not flow inside the rotating member 50, the molten glass ribbon G is not easily cooled in the vicinity of the rotating member 50. As a result, the temperature of the molten glass ribbon G and, consequently, the thickness of the molten glass ribbon G is stabilized, so that the flatness of the plate glass as a product is improved.
  • the rotating member 50 is easy to bite into the molten glass ribbon G, and the grip property of the rotating member 50 to the molten glass ribbon G is improved. . This effect is remarkable on the downstream side in the flow direction where the temperature of the molten glass ribbon G is lowered.
  • the ceramics are not particularly limited, for example, silicon carbide (SiC) quality ceramics, silicon nitride (Si 3 N 4) such quality ceramics are used. Silicon carbide and silicon nitride have high resistance to the splash of molten tin S and the vapor of molten tin S, and are excellent in high temperature strength and creep characteristics.
  • the type of ceramic is selected according to the type of plate glass (ie, molten glass ribbon G) that is the product.
  • the plate glass is non-alkali glass
  • silicon nitride ceramics excellent in thermal shock resistance are suitable.
  • the temperature in the float bath 20 tends to be high, so that the higher the thermal shock resistance, the higher the degree of freedom of operation.
  • the higher the temperature the more likely the reactivity with the molten glass ribbon G and the molten tin S becomes, but silicon nitride ceramics tend to have low reactivity.
  • the type of plate glass is soda lime glass, silicon carbide ceramics or alumina ceramics can be used in addition to silicon nitride ceramics.
  • the alkali-free glass is a glass that does not substantially contain an alkali metal oxide (Na 2 O, K 2 O, Li 2 O).
  • the total content (Na 2 O + K 2 O + Li 2 O) of the alkali metal oxide content in the alkali-free glass may be, for example, 0.1% or less.
  • the alkali-free glass is, for example, expressed in terms of mass percentage based on oxide, SiO 2 : 50 to 70%, preferably 50 to 66%, Al 2 O 3 : 10.5 to 24%, B 2 O 3 : 0 to 12%, MgO: 0 to 10%, preferably 0 to 8%, CaO: 0 to 14.5%, SrO: 0 to 24%, BaO: 0 to 13.5%, ZrO 2 : 0 to 5% MgO + CaO + SrO + BaO: 8 to 29.5%, preferably 9 to 29.5%.
  • the alkali-free glass has a high strain point, and when considering the solubility, it is preferably expressed in terms of mass percentage based on oxide, SiO 2 : 58 to 66%, Al 2 O 3 : 15 to 22%, B 2 O 3 : 5 to 12%, MgO: 0 to 8%, CaO: 0 to 9%, SrO: 3 to 12.5%, BaO: 0 to 2%, MgO + CaO + SrO + BaO: 9 to 18% is there.
  • the alkali-free glass is preferably expressed in terms of mass percentage based on oxide, SiO 2 : 54 to 73%, Al 2 O 3 : 10.5 to 22.5%, B 2 O 3 : 0 to 5.5%, MgO: 0 to 10%, CaO: 0 to 9%, SrO: 0 to 16%, BaO: 0 to 2.5%, MgO + CaO + SrO + BaO: 8 to 26% is there.
  • the rotating member 50 that contacts the molten glass ribbon G may be silicon nitride ceramics, and the entire rotating member 50 is not silicon nitride ceramics. Also good.
  • a silicon nitride ceramic layer may be formed on a base material made of metal, carbon or other ceramics by film formation, bonding or fitting.
  • different types of ceramics may be used for each part of the rotating member 50.
  • the entire rotating member 50 is formed of silicon nitride ceramics.
  • the silicon nitride ceramics may be a sintered body obtained by sintering a molded body made of a mixed powder containing silicon nitride powder and sintering aid powder.
  • the sintering method there are an atmospheric pressure sintering method, a pressure sintering method (including hot press sintering, gas pressure sintering) and the like.
  • the sintering aid for example, at least one selected from alumina (Al 2 O 3 ), magnesia (MgO), titania (TiO 2 ), zirconia (ZrO 2 ), and yttria (Y 2 O 3 ) is used. It is done.
  • the silicon nitride ceramic has an aluminum (Al) content of 0.1% by mass or less, preferably less than 1% by mass, and a magnesium (Mg) content of 0.7% by mass or less, preferably 0.7% by mass.
  • the titanium (Ti) content is 0.9 mass% or less, preferably less than 0.9 mass%.
  • the silicon nitride ceramic has a zirconium (Zr) content of 3.5% by mass or less, preferably less than 3.5% by mass, and a yttrium (Y) content of 0.5% by mass or more, preferably 0.5%. It is preferable to be more than 10% by mass, more preferably less than 10% by mass.
  • Zr and Y are components that are less likely to interdiffuse with the molten glass ribbon G as compared with Al, Mg, and Ti, and thus may be contained in the above range. By containing in the above range, sintering of the silicon nitride powder can be promoted.
  • Zr is an optional component, and the Zr content may be 0% by mass.
  • the silicon nitride ceramic of the present embodiment is a sintered body obtained by a normal pressure sintering method or a pressure sintering method, but may be a sintered body obtained by a reactive sintering method.
  • the reaction sintering method is a method in which a molded body formed of metal silicon (Si) powder is heated in a nitrogen atmosphere. Since the reaction sintering method does not use a sintering aid, a high-purity sintered body can be obtained, and the durability of the sintered body with respect to the molten glass ribbon G can be improved.
  • a circular hole is formed through the center of the rotating member 50.
  • the rod portion 64 is inserted through the circular hole.
  • the inner diameter of the circular hole is larger than the outer diameter of the rod portion 64.
  • an insertion hole is formed through the rotating member 50.
  • the shaft portions 67 and 68 are inserted through the insertion holes.
  • the inner diameter of each insertion hole is larger than the outer diameter of the corresponding shaft portions 67 and 68.
  • FIG. 5 is a front view showing a modified example (1) of the rotating member.
  • 6A to 6C are examples of cross-sectional views taken along line VI-VI in FIG.
  • the outer peripheral surface 56A of the rotating member 50A shown in FIG. 5 has a curved shape whose cross-sectional shape is convex outward in the radial direction.
  • the central portion in the axial direction protrudes radially outward from both end portions in the axial direction.
  • the rotating member 50A does not have gear-like irregularities on the outer peripheral surface 56A. Even if there are no gear-like irregularities, the rotating member 50A can bite into the molten glass ribbon G. This is because the refrigerant does not flow inside the rotating member 50A, so that the molten glass ribbon G is not strongly cooled in the vicinity of the rotating member 50A and is not easily hardened.
  • the convex curved radius of curvature Ra is preferably R1 mm to R100 mm, more preferably R3 mm to R50 mm, and more preferably R5 mm to R30 mm in consideration of the grip force with the molten glass ribbon G. Is more preferable, and R10 mm to R20 mm is particularly preferable.
  • the curvature radius Rb of the central portion in the axial direction and the curvature radius Rc of both end portions in the axial direction may be a composite R.
  • the curvature radii Rb and Rc are preferably R1 mm to R100 mm, more preferably R3 mm to R50 mm, further preferably R5 mm to R30 mm, and particularly preferably R10 mm to R20 mm.
  • the convex curved shape may have a flat portion in part, but it is preferable not to have a flat portion because the grip force with the molten glass ribbon G is stable.
  • the radial width d of the rotating member 50A in the convex curved shape shown in FIG. 6B is preferably 0.5 mm or more, more preferably 1 mm or more. 2 mm or more is more preferable.
  • the radial width d of the rotating member 50A in the convex curved shape is preferably 5 mm or less, and more preferably 4 mm or less.
  • the radius r of the rotating member 50A shown in FIG. 6B is preferably 100 mm or more, more preferably 150 mm or more in consideration of prevention of contact between the attachment member 60 and the molten glass ribbon G and the horizontality of the shaft member 70. 180 mm or more is more preferable, and considering the position adjustment of the rotating member 50A and the molten glass ribbon G and the fine adjustment of the rotation speed of the rotating member 50A, 350 mm or less is preferable, 300 mm or less is more preferable, and 270 mm or less is more preferable.
  • the thickness w of the rotating member 50A is preferably 5 mm or more, more preferably 10 mm or more, and further preferably 15 mm or more in consideration of the grip force with the molten glass ribbon G. Considering prevention of the increase in the grip width, it is preferably 60 mm or less, more preferably 40 mm or less, and further preferably 35 mm or less.
  • the outer peripheral surface 56A of the rotating member 50A is a curved shape whose cross-sectional shape is convex outward in the radial direction, as shown in FIGS. Therefore, it is difficult to break and the molding and processing costs are reduced. 6 (a) to 6 (c) are preferable because the molten glass ribbon G can be stably formed into a sheet glass.
  • FIG. 7 to 10 are front views showing modified examples (2) to (5) of the rotating member.
  • the rotating members 50B to 50E are provided with notches 57B or through holes 58C, 58D, and 59E in order to relieve stress caused by a temperature gradient in the rotating members 50B to 50E. Is formed.
  • Conventional metal rotating members have a cooling channel inside as described above, and therefore it is difficult to provide the notches and through holes.
  • the rotating member of the present invention does not require cooling and does not require a cooling channel.
  • the notch and the through hole can be easily and arbitrarily provided. When the notch or the through hole is provided in the rotating member, the stress of the rotating member can be relieved, and further, residual stress at the time of manufacturing the rotating member is also relieved, and distortion and breakage of the rotating member can be prevented. .
  • a plurality of arc-shaped cutouts 57B are formed at intervals along the inner periphery of the circular hole 53B.
  • a plurality of radial through holes 58C are radially formed.
  • a plurality of arc-shaped through holes 58D that are long in the circumferential direction are formed.
  • the dimensional shape and arrangement position of the notch 57B and the through holes 58C, 58D, and 59E are obtained by, for example, stress analysis such as a finite element method.
  • the support roll 40 of the present embodiment may be used only in a partial region in the float bath 20, and may be used as a support roll on the downstream side, for example. This is because, on the downstream side, the temperature is low and the molten glass ribbon is hard, so that grip properties tend to be a problem.
  • the support roll 40 of the present invention is preferably used in the region where the viscosity of the molten glass ribbon G is 10 3 to 10 13 [dPa ⁇ s]. That is, in the case of the alkali-free glass, it is preferable to use the molten glass ribbon G in the region where the temperature is 800 to 1400 ° C. Conventionally, it is stable in the region 1 where the viscosity of the molten glass ribbon G is 10 6.5 to 10 13 [dPa ⁇ s], that is, in the case of the non-alkali glass, the region 1 where the temperature of the molten glass ribbon G is 800 to 1000 ° C. However, it is more preferable to use the support roll 40 of the present invention at least in the region 1 because a stable grip is possible even in the region 1.
  • the support roll 40 of this embodiment is used by the float process, it may be used by another shaping
  • the support rolls are columnar or cylindrical, and are used in pairs so as to sandwich the molten glass ribbon from the front side and the back side, and the support roll group consisting of the two support rolls is a molten glass.
  • a plurality of pairs are arranged on both sides of the ribbon in the width direction.
  • the sheet glass forming apparatus has a bowl-shaped member to which molten glass is continuously supplied.
  • the molten glass that has overflowed from the upper edges of the left and right sides of the bowl-shaped member flows down along the left and right sides of the bowl-shaped member, and merges at the lower edge where the left and right sides intersect, and is then integrated into a molten glass ribbon. It becomes.
  • the molten glass ribbon is fed downward while tension is applied in the width direction by a plurality of pairs of support rolls and shrinkage in the width direction is suppressed.
  • test piece and the test plate for evaluation were produced by processing a sintered body of silicon nitride (Si 3 N 4 ) -based ceramics that differs for each example.
  • the content of impurities in the sintered body was measured by analyzing a test piece cut into a square shape from the sintered body by glow discharge mass spectrometry. Impurities to be measured are included as sintering aids, and are aluminum (Al), magnesium (Mg), titanium (Ti), zirconium (Zr), and yttrium (Y).
  • the wettability of the sintered body with respect to the molten glass was measured with a high temperature wettability tester (manufactured by ULVAC-RIKO, WET1200). Specifically, a square glass piece of alkali-free glass (manufactured by Asahi Glass Co., Ltd., AN100) was placed on a test plate processed to a thickness of 1 mm, heated in a nitrogen atmosphere to 1150 ° C. in 10 minutes, and 1150 ° C. Was maintained for 10 minutes to form a molten glass, and the temperature was lowered from 1150 ° C. to 1050 ° C. in 90 seconds and maintained at 1050 ° C., and the contact angle of the droplet was measured.
  • a high temperature wettability tester manufactured by ULVAC-RIKO, WET1200. Specifically, a square glass piece of alkali-free glass (manufactured by Asahi Glass Co., Ltd., AN100) was placed on a test plate processed to
  • the measurement was performed when the temperature dropped to 1050 ° C., and after 2 hours, 4 hours, 6 hours, and 8 hours from that point.
  • a larger contact angle means that the molten glass is less likely to get wet with the sintered body, and therefore indicates that the reactivity between the molten glass and the sintered body is low.
  • the smaller the change in the contact angle with time the easier the wettability is sustained.
  • the Al content is 0.1% by mass or less, preferably less than 0.1% by mass, and the Mg content is 0.7% by mass or less, preferably less than 0.7% by mass.
  • Ti content is 0.9 mass% or less, preferably less than 0.9 mass%
  • Zr content is 3.5 mass% or less, preferably less than 3.5 mass%
  • Y content is 0.5 mass%. More than 10% by mass, preferably more than 0.5% by mass and less than 10% by mass, there is little change in the contact angle over time, and the contact angle after 8 hours is large, so that good durability can be obtained. I understand that.
  • the present invention is suitable for a supporting roll, a sheet glass forming apparatus having the supporting roll, and a sheet glass forming method using the supporting roll.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Glass Compositions (AREA)
PCT/JP2012/077520 2011-11-17 2012-10-24 支持ロール、支持ロールを有する板ガラスの成形装置、および支持ロールを用いた板ガラスの成形方法 WO2013073352A1 (ja)

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