WO2023112731A1 - ガラス物品の製造装置及び製造方法 - Google Patents

ガラス物品の製造装置及び製造方法 Download PDF

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Publication number
WO2023112731A1
WO2023112731A1 PCT/JP2022/044614 JP2022044614W WO2023112731A1 WO 2023112731 A1 WO2023112731 A1 WO 2023112731A1 JP 2022044614 W JP2022044614 W JP 2022044614W WO 2023112731 A1 WO2023112731 A1 WO 2023112731A1
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WO
WIPO (PCT)
Prior art keywords
cooling
glass
outer tube
glass ribbon
tube
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/044614
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English (en)
French (fr)
Japanese (ja)
Inventor
寛典 青木
彰 服部
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Nippon Electric Glass Co Ltd
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Nippon Electric Glass Co Ltd
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 Nippon Electric Glass Co Ltd filed Critical Nippon Electric Glass Co Ltd
Priority to JP2023567698A priority Critical patent/JPWO2023112731A1/ja
Priority to CN202290000751.1U priority patent/CN222593684U/zh
Publication of WO2023112731A1 publication Critical patent/WO2023112731A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B25/00—Annealing glass products
    • C03B25/04—Annealing glass products in a continuous way
    • C03B25/10—Annealing glass products in a continuous way with vertical displacement of the glass products
    • C03B25/12—Annealing glass products in a continuous way with vertical displacement of the glass products of glass sheets

Definitions

  • the present invention relates to an apparatus and method for manufacturing glass articles such as glass ribbons.
  • Glass plates are used as substrates and covers for displays such as liquid crystal displays and organic EL displays and for organic EL lighting.
  • the overflow down-draw method is known as a method for manufacturing these glass sheets.
  • molten glass is poured into an overflow groove provided in the upper part of a molded body having a substantially wedge-shaped cross section, and the molten glass flowing out on both sides from the overflow groove is allowed to flow down along two side surfaces of the molded body. , and by fusing and integrating these molten glasses at the lower end of the molded body, one sheet of glass ribbon is continuously molded.
  • the glass ribbon formed in this way is conveyed while being given an appropriate tension by conveying rollers arranged below the molded body. Thereby, the thickness of the glass ribbon can be controlled.
  • the viscosity of the molten glass supplied to the molded body is relatively high in order to apply an appropriate tension to the glass ribbon.
  • the viscosity of the molten glass is low, it is impossible to apply an appropriate tension to the glass ribbon, and the thickness of the glass ribbon cannot be controlled due to the influence of gravity.
  • rollers forming rollers arranged below the formed body (isopipe) are used.
  • the viscosity of the glass ribbon (glass stream) formed by the forming body can be increased by contacting the roller and cooling the glass ribbon (see paragraph 0120 of the same document).
  • the technical problem of the present invention is to uniformly cool the rollers for cooling the glass ribbon.
  • the present invention is intended to solve the above problems, and an apparatus for manufacturing a glass article comprising a formed body for forming a glass ribbon from molten glass by a down-draw method, and a cooling roller in contact with the entire width of the glass ribbon.
  • the cooling roller includes an outer tube whose outer surface is in contact with the glass ribbon, an inner tube disposed inside the outer tube, and a coolant supply channel formed by the inner surface of the inner tube. and a cooling channel through which the coolant supplied from the supply channel flows, wherein the cooling channel is formed between the inner surface of the outer tube and the outer surface of the inner tube.
  • the inner tube is arranged inside the outer tube, and the flow from the supply channel formed by the inner surface of the inner tube to the cooling channel formed between the outer surface of the inner tube and the inner surface of the outer tube.
  • the outer surface of the inner pipe has a plurality of supply holes for ejecting the coolant flowing through the supply flow channel to the cooling flow channel, and the plurality of supply holes are spaced apart in the longitudinal direction of the inner pipe. may be formed after
  • the plurality of supply holes formed on the outer surface of the inner pipe are spaced apart in the longitudinal direction of the inner pipe, thereby reducing the temperature difference of the coolant in the cooling flow path. It becomes possible to cool the outer tube more evenly.
  • the supply hole is configured to eject the coolant upward from the outer surface of the inner tube, and the coolant is supplied so as not to overlap a contact area where the glass ribbon contacts the outer tube. It may be configured to jet.
  • the cooling of the glass ribbon may become uneven.
  • the coolant by ejecting the coolant upward so as to avoid the contact area of the glass ribbon, it is possible to uniformly cool the outer tube and suitably cool the glass ribbon.
  • the outer tube may be rotatable, and the inner tube having the supply hole may be non-rotatable. With such a configuration, the refrigerant can always be supplied in a constant direction from the supply hole of the inner tube, and the outer tube can be stably cooled.
  • the inner tube includes a first inner tube extending from one end of the outer tube to the inside of the outer tube, and a second inner tube extending from the other end of the outer tube to the inside of the outer tube,
  • the supply channel may include a first supply channel formed by the inner surface of the first inner tube and a second supply channel formed by the inner surface of the second inner tube.
  • the cooling channel can be supplied from each supply channel. It is possible to reduce the temperature difference of the refrigerant to be applied as much as possible. As a result, even if the length dimension of the outer tube is large, for example, even if the length dimension of the outer tube is 1000 mm or more, the outer tube can be uniformly cooled.
  • the one end of the outer tube includes a first discharge channel for discharging the coolant supplied from the first supply channel to the cooling channel, and the other end of the outer tube includes the second A second discharge channel may be provided for discharging the coolant supplied from the supply channel to the cooling channel.
  • the coolant supplied from the first supply channel to the cooling channel is discharged from the first discharge channel, and the coolant supplied from the second supply channel to the cooling channel is discharged from the second discharge channel.
  • the outer tube can be cooled more evenly even if the length of the outer tube is increased.
  • the cooling roller may include a partition member that partitions the intermediate portion of the cooling channel. According to such a configuration, by partitioning the cooling channel by the partition member, the coolant supplied from the first supply channel to the cooling channel is discharged from the first discharge channel and cooled from the second supply channel. It is possible to promote discharge of the coolant supplied to the channel from the second discharge channel. Therefore, even if the length dimension of the outer tube is increased, the outer tube can be cooled more uniformly.
  • the partition member may be fixed to the inner tube, and a gap may be formed between the partition member and the inner surface of the outer tube. As a result, it is possible to prevent the cooling effect from being lowered due to the contact of the partition member with the inner surface of the outer tube.
  • the present invention is intended to solve the above problems, and manufactures a glass article comprising a forming step of forming a glass ribbon from molten glass by a down-draw method, and a cooling step of contacting the glass ribbon with a cooling roller.
  • the cooling roller comprises an outer tube whose outer surface is in contact with the entire width of the glass ribbon, an inner tube disposed inside the outer tube, and a coolant supply formed by the inner surface of the inner tube. and a cooling channel through which the coolant supplied from the supply channel flows, wherein the cooling channel is formed between the outer surface of the inner tube and the inner surface of the outer tube.
  • the inner tube is arranged inside the outer tube, and the flow from the supply channel formed by the inner surface of the inner tube to the cooling channel formed between the outer surface of the inner tube and the inner surface of the outer tube.
  • the outer surface of the outer tube can be evenly cooled over its entire lengthwise range in the cooling process.
  • the rollers for cooling the glass ribbon can be evenly cooled.
  • FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1; It is a sectional view of a cooling device in a manufacturing device of glass articles. It is a front view which shows the manufacturing apparatus of the glass article which concerns on 2nd embodiment.
  • FIG. 5 is a cross-sectional view along the VV arrow line of FIG. 4; It is sectional drawing which shows the manufacturing apparatus of the glass article which concerns on 3rd embodiment. It is a sectional view showing a manufacturing device of a glass article concerning a fourth embodiment.
  • FIG. 11 is a cross-sectional view of a cooling device in a glass article manufacturing apparatus according to a fifth embodiment;
  • FIG. 1 to 3 show an embodiment of a glass article manufacturing apparatus and manufacturing method according to the present invention.
  • the manufacturing apparatus 1 mainly includes a molding area 2, a cooling area 3 provided below the molding area 2, and a slow cooling area 4 provided below the cooling area 3. Prepare.
  • the molding area 2 includes a molding 5 for molding the glass ribbon GR from the molten glass GM.
  • the compact 5 is made of dense zircon, alumina-based, zirconia-based, or other refractory bricks.
  • the compact 5 may be provided with a coating of noble metal (for example platinum or a platinum alloy).
  • the noble metal coating can be formed, for example, by thermal spraying.
  • the noble metal coating may be formed, for example, on the entire surface of the compact 5, or may be formed only on the portion that comes into contact with the molten glass GM.
  • the molded body 5 is configured in a long shape and has an overflow groove 6 formed along its longitudinal direction at the top.
  • the molded body 5 also includes a pair of side surfaces 7 and a guide portion 8 that guides (regulates) the widthwise end portions of the molten glass GM downward.
  • Each side surface 7 includes a vertical surface portion 9 positioned on the upper side and an inclined surface portion 10 positioned on the lower side. As shown in FIG. 2, the pair of vertical surface portions 9 associated with the pair of side surfaces 7 are formed along the vertical direction. The pair of inclined surface portions 10 are inclined so as to approach each other downward. The lower end portions of the inclined surface portions 10 are connected to form the lower end portion 11 of the molded body 5 .
  • the molten glass GM overflowing from the overflow groove 6 on both sides flows down along each side surface 7 to form a plate.
  • the plate-shaped molten glass GM flowing down each side surface 7 is fused and integrated at the lower end portion 11 to continuously form one glass ribbon GR.
  • the glass ribbon GR includes a first main surface GRa and a second main surface GRb located on the opposite side of the first main surface GRa.
  • the glass ribbon GR includes each end portion GRc in the width direction X and a central portion GRd in the width direction X.
  • the end portion GRc of the glass ribbon GR is a portion that is cut off from the central portion GRd in a subsequent step and discarded.
  • the central portion GRd of the glass ribbon GR is a portion that can be made into a product by removing the end portion GRc.
  • silicate glass is used, preferably borosilicate glass or soda lime glass, more preferably alkali aluminosilicate glass, LAS glass or non-alkali glass. If alkali aluminosilicate glass is used, it will be suitable for the cover of the display by performing chemical strengthening treatment in a post-process. In addition, if LAS-based glass is used, it is suitable for heat-resistant crystallized glass by subjecting it to a crystallization treatment in a post-process. If alkali-free glass is used, it will be suitable for display substrates.
  • the alkali-free glass is a glass that does not substantially contain an alkali component (alkali metal oxide), and specifically, a glass in which the weight ratio of the alkali component is 3000 ppm or less. be.
  • the weight ratio of the alkaline component is preferably 1000 ppm or less, more preferably 500 ppm or less, and most preferably 300 ppm or less.
  • the thickness dimension of the glass ribbon GR is, for example, 400 to 1200 ⁇ m.
  • the width dimension of the glass ribbon GR is, for example, 400 to 2000 mm.
  • the cooling area 3 includes a cooling device 12 that cools the glass ribbon GR formed by the formed body 5 .
  • the cooling device 12 includes a cooling roller 13 that contacts the entire width of the glass ribbon GR from one end GRc to the other end GRc, and a driving mechanism that rotates the cooling roller 13. 14, and a guide roller 15 that sandwiches the glass ribbon GR together with the cooling roller 13. As shown in FIG.
  • the cooling roller 13 is arranged below the compact 5 .
  • a vertical distance D between the cooling roller 13 and the lower end portion 11 of the compact 5 is, for example, 50 to 150 mm.
  • the cooling roller 13 is made of metal, and is cylindrically formed of, for example, heat-resistant steel.
  • the cooling roller 13 includes an outer tube 16 having a length dimension larger than the width dimension of the glass ribbon GR, and an inner tube 17 arranged inside the outer tube 16.
  • the length dimension of the outer tube 16 is, for example, 450 to 2300 mm, preferably 1000 to 2300 mm.
  • the outer tube 16 has an outer surface 16a and an inner surface 16b.
  • An outer surface 16a of the outer tube 16 is a contact surface that contacts the glass ribbon GR.
  • the outer tube 16 has a first shaft portion 18A at one end and a second shaft portion 18B at the other end.
  • Each shaft portion 18A, 18B is hollow and has an outer surface 18a and an inner surface 18b.
  • the inside of each shaft portion 18A, 18B communicates with the inside of the outer tube 16. As shown in FIG.
  • the glass ribbon GR contacts part of the upper portion of the outer surface 16 a of the outer tube 16 .
  • the area where the glass ribbon GR contacts the outer surface 16a of the outer tube 16 will be referred to as a "contact area” and indicated by the symbol CA.
  • a region of the upper portion of the outer surface 16a of the outer tube 16 that is not in contact with the glass ribbon GR is referred to as a "non-contact region" and denoted by NCA.
  • the inner tube 17 includes a first inner tube 17A extending from one end of the outer tube 16 (first shaft portion 18A side) into the outer tube 16 and the other end of the outer tube 16 (first shaft portion 18A side).
  • a second inner tube 17B extending from the side of the biaxial portion 18B into the outer tube 16, and a partition member 19 separating the first inner tube 17A and the second inner tube 17B.
  • each of the inner tubes 17A and 17B is housed inside the outer tube 16 and the other part extends outside the outer tube 16 .
  • outer tube 16 Outside the outer tube 16, intermediate portions of the inner tubes 17A and 17B are non-rotatably supported by a support member 20. As shown in FIG.
  • Each of the inner tubes 17A and 17B has an outer surface 17a, an inner surface 17b, coolant supply passages 21a and 21b formed therein, and a plurality of supply holes 17c formed in the outer surface 17a.
  • coolant supplied to the inner pipe 17 include air, water vapor, and water.
  • each inner tube 17A, 17B is smaller than the inner diameter of the outer tube 16.
  • cooling channels 22a, 22b through which the coolant flows are formed.
  • each of the inner tubes 17A, 17B is smaller than the inner diameter of each of the shaft portions 18A, 18B of the outer tube 16.
  • discharge passages 23a and 23b for discharging the refrigerant are formed between the outer surfaces 17a of the inner tubes 17A and 17B and the inner surfaces 18b of the respective shaft portions 18A and 18B.
  • a discharge port 23c for discharging the refrigerant passing through the discharge passages 23a and 23b to the outside of the outer tube 16 is formed at the end of each of the shaft portions 18A and 18B.
  • the supply channels 21a and 21b include a first supply channel 21a formed by the inner surface 17b of the first inner tube 17A and a second supply channel 21b formed by the inner surface 17b of the second inner tube 17B.
  • the first supply channel 21 a extends from one end of the outer tube 16 into the outer tube 16
  • the second supply channel 21 b extends from the other end of the outer tube 16 into the outer tube 16 .
  • the first supply channel 21a and the second supply channel 21b are separated by the partition member 19 and are not in communication with each other.
  • a plurality of supply holes 17c formed in the first inner tube 17A and the second inner tube 17B are formed at intervals in the longitudinal direction of each inner tube 17A, 17B.
  • Each supply hole 17c is a hole penetrating from the inner surface 17b of each inner tube 17A, 17B to the outer surface 17a.
  • Each supply hole 17c is formed in the upper part of each inner tube 17A, 17B so as to eject the refrigerant upward.
  • Each supply hole 17c can jet coolant toward the inner surface 16b of the outer tube 16 so as not to overlap the contact area CA of the glass ribbon GR with respect to the outer tube 16.
  • the partition member 19 is fixed so as to connect the end of the first inner tube 17A and the end of the second inner tube 17B.
  • the ends of the first inner tube 17A and the second inner tube 17B support the partition member 19 so that the partition member 19 does not contact the inner surface 16b of the outer tube 16.
  • the partition member 19 is configured in a disc shape, it is not limited to this shape.
  • the outer diameter of the partition member 19 is smaller than the inner diameter of the outer tube 16 . Therefore, a gap S is formed between the outer peripheral surface of the partition member 19 and the inner surface 16 b of the outer tube 16 .
  • the size of this gap S ie, the distance between the inner surface 16b of the outer tube 16 and the outer peripheral surface of the partition member 19, is set to 5 to 20 mm, for example.
  • the partition member 19 is positioned inside the outer tube 16 at an intermediate portion in the longitudinal direction of the outer tube 16 .
  • the cooling channels 22a and 22b are partitioned by the partition member 19 into the first cooling channel 22a and the second cooling channel 22b.
  • the drive mechanism 14 includes a bearing portion 24 that rotatably supports the shaft portions 18A and 18B of the outer tube 16, a power transmission mechanism 25 provided on the first shaft portion 18A, and a motor 26 that drives the power transmission mechanism 25.
  • the power transmission mechanism 25 is configured by, for example, a gear mechanism, but is not limited to this configuration.
  • the power transmission mechanism 25 includes a first gear 27a (driven gear) provided on the outer surface 18a of the first shaft portion 18A, and a second gear 27b (drive gear) that meshes with the first gear 27a.
  • an intermediate gear may be provided between the first gear 27a and the second gear 27b.
  • the second gear 27 b is rotationally driven by the motor 26 .
  • the shaft of the motor 26 is connected to the second gear 27b.
  • a shaft portion of the motor 26 is arranged parallel to the first shaft portion 18A of the outer tube 16 at a position away from the first shaft portion 18A.
  • the guide roller 15 includes a roller portion 28 and a shaft portion 29 that supports the roller portion 28 .
  • the roller portion 28 is made of, for example, metal (more specifically, heat-resistant steel).
  • the outer peripheral surface (surface) of the roller portion 28 has an uneven shape and serves as a contact surface that contacts the glass ribbon GR.
  • the shaft portion 29 is rotationally driven by a drive source such as a motor.
  • the guide roller 15 has a cooling mechanism inside.
  • the position (height) of the guide roller 15 in the vertical direction of the axis O2 is the same as the position (height) of the cooling roller 13 in the vertical direction of the axis O1. That is, the axis O1 of the cooling roller 13 and the axis O2 of the guide roller 15 are positioned on the same horizontal line HL.
  • the slow cooling region 4 includes a plurality of upper and lower stages of transport rollers 30 that transport the glass ribbon GR downward.
  • the transport roller 30 is arranged below the cooling roller 13 and the guide roller 15 .
  • the conveying rollers 30 on each of the upper and lower stages are composed of a pair of rollers that sandwich the end portion GRc of the glass ribbon GR in the width direction X between the first main surface GRa side and the second main surface GRb side.
  • Each transport roller 30 has a roller portion 31 and a shaft portion 32 .
  • the roller portion 31 is made of ceramics, for example.
  • the roller portion 31 has a surface (contact surface) that contacts the end portion GRc in the width direction X of the glass ribbon GR.
  • the shaft portion 32 is rotationally driven by a driving source such as a motor.
  • the slow cooling region 4 includes heaters (not shown) arranged along the transport path of the glass ribbon GR.
  • the heater forms a predetermined temperature gradient in the conveying path of the glass ribbon GR.
  • This method includes a forming step of forming a glass ribbon GR from molten glass GM by an overflow downdraw method, a cooling step of contacting the glass ribbon GR with a cooling roller 13 of a cooling device 12, and a glass ribbon GR passing through the cooling roller 13. and a slow cooling step of slowly cooling the
  • the molten glass GM is overflowed from the overflow groove 6 of the molded body 5 and flowed downward through both side surfaces 7 of the molded body 5.
  • the glass ribbon GR is formed by fusing the plate-shaped molten glass GM at the lower end portion 11 of the formed body 5 .
  • the formed body 5 can form a glass ribbon GR having a constant width by regulating the end portion of the molten glass GM with the guide portion 8 .
  • the temperature of the glass ribbon GR is, for example, 1000 to 1450° C. before contacting the cooling roller 13 away from the lower end portion 11 of the formed body 5 .
  • the viscosity of the glass ribbon GR in this case is 10 2.0 to 10 5.5 dPa ⁇ s.
  • the viscosity is 10 2.0 to 10 4.5 dPa ⁇ s.
  • the viscosity is, for example, 10 2.0 to 10 5.5 dPa ⁇ s, preferably 10 4.5 to 10 5.5 dPa ⁇ s.
  • the liquidus viscosity of the molten glass GM is preferably 10 2 dPa ⁇ s or more and 10 4.5 dPa ⁇ s or less.
  • the "liquidus viscosity” refers to the viscosity of the glass at the liquidus temperature, and can be measured by the platinum ball pull-up method.
  • the viscosity of the molten glass GM at 1000° C. can be 10 4.5 dPa ⁇ s or more, preferably 10 7.0 dPa ⁇ s or more.
  • the upper limit of the viscosity of the molten glass GM at 1000° C. is preferably 10 7.6 dPa ⁇ s or less from the viewpoint of preventing cracks.
  • the second main surface GRb of the glass ribbon GR separated from the lower end portion 11 of the formed body 5 is brought into contact with the outer surface 16a of the outer tube 16 on the cooling roller 13 in the cooling area 3 .
  • the temperature of the second main surface GRb of the glass ribbon GR becomes 650 to 1000° C., for example.
  • the temperature of the second main surface GRb of the glass ribbon GR becomes lower than the temperature of the first main surface GRa due to contact with the cooling roller 12, and the temperature difference is, for example, 150-450.degree.
  • the viscosity of the second main surface GRb of the glass ribbon GR is, for example, 10 7.0 to 10 9.9 dPa ⁇ s, preferably 10 7.6 to 10 9.9 dPa ⁇ s.
  • the guide roller 15 contacts the end portion GRc of the glass ribbon GR from the first main surface GRa side. As a result, the end portion GRc of the glass ribbon GR is held between a portion of the outer surface 16 a of the outer tube 16 of the cooling roller 13 and the guide roller 15 .
  • the cooling roller 13 and the guide roller 15 guide the glass ribbon GR vertically downward while rotating.
  • the cooling device 12 causes the drive mechanism 14 to rotate the outer tube 16 at a predetermined rotational speed (clockwise in FIG. 2).
  • the cooling device 12 supplies coolant to the cooling channels 22a and 22b through the supply channels 21a and 21b and the supply holes 17c of the inner pipes 17A and 17B.
  • Each supply hole 17c of each inner pipe 17A, 17B ejects the refrigerant supplied through each supply flow path 21a, 21b upward as indicated by the arrow in FIG. At this time, the coolant is jetted so as not to overlap the contact area CA, that is, toward the non-contact area NCA.
  • the coolant supplied to the cooling channels 22a and 22b from the supply hole 17c flows through the cooling channels 22a and 22b, passes through the discharge channels 23a and 23b, and is discharged to the outside of the outer pipe 16 from the discharge port 23c. be done.
  • the glass ribbon GR passes through the slow cooling region 4 by being conveyed by the conveying rollers 30 (conveying process).
  • the glass ribbon GR sent out vertically downward from the cooling roller 13 is conveyed vertically downward by the conveying rollers 30 .
  • the glass ribbon GR can be transported while being inclined with respect to the vertical direction.
  • a rectangular glass plate is obtained by cutting the middle portion of the glass ribbon GR along the width direction X.
  • quality inspection process after cutting a portion corresponding to the end portion GRc of the glass ribbon GR from the glass plate, quality inspection of the surface of the glass plate (inspection process), grinding/polishing of the end portion of the glass plate (grinding/polishing process).
  • the surface of the glass plate is washed (washing step) to produce a glass plate as a glass article.
  • the method may include a winding step of winding into a roll the glass ribbon GR that has the ends GRc cut off and is composed only of the central portion GRd. Thereby, a glass roll as a glass article is manufactured.
  • the inner tube 17 of the cooling roller 13 of the cooling device 12 is arranged inside the outer tube 16, and the inner surface 17b of the inner tube 17 forms the By supplying coolant from supply channels 21a and 21b formed between the outer tube 17 and the inner surface 16b of the outer tube 16 to cooling channels 22a and 22b formed between the outer surface 17a of the inner tube 17 and the inner surface 16b of the outer tube 16, the outer tube 16 is lengthwise Even cooling can be achieved over the entire range of directions.
  • the cooling area 3 of the manufacturing apparatus 1 includes edge rollers 33 positioned below the cooling rollers 13 .
  • the edge rollers 33 are paired left and right so as to grip a pair of edges included in the ends GRc in the width direction X of the glass ribbon GR.
  • each edge roller 33 includes two rollers that sandwich the glass ribbon GR.
  • Each edge roller 33 has a roller portion 34 and a shaft portion 35 .
  • the roller portion 34 is made of, for example, a heat-resistant member such as ceramics or metal.
  • the shaft portion 35 is rotationally driven by a driving source such as a motor.
  • Each edge roller 33 has a cooling mechanism inside, like the guide roller 15 of the first embodiment.
  • the edge roller 33 is configured to be movable along its axial direction.
  • the edge rollers 33 hold (cool) the edges of the glass ribbon GR that has passed through the cooling rollers 13, thereby suppressing the shrinkage of the glass ribbon GR in the width direction X and keeping the glass ribbon GR constant. Form in width.
  • FIG. 6 shows a third embodiment of the present invention. This embodiment differs from the first embodiment in the configuration of the molded body 5 and the molding process.
  • the molded body 5 includes one side surface 7 that guides downward the molten glass GM that has flowed out of the overflow groove 6, and a guide portion 8 that guides (regulates) downward the widthwise end of the molten glass GM.
  • the side surface 7 of the molded body 5 is composed only of the vertical surface portion 9 extending in the vertical direction, but the shape of the side surface 7 is not limited to this embodiment.
  • the side surface 7 may be a surface inclined with respect to the vertical direction, or may be a surface formed by combining a vertical surface portion 9 and an inclined surface portion.
  • the molding process instead of fusing the molten glass GM at the lower end portion 11 of the molded body 5 by the pair of side surfaces 7 as in the first embodiment, only one side surface 7 is used to fuse the molten glass GM from the A glass ribbon GR can be molded.
  • the glass ribbon GR has a first main surface GRa and a second main surface GRb formed by the contact of the molten glass GM with the side surface 7 .
  • the cooling roller 13 of the cooling device 12 contacts the second main surface GRb of the glass ribbon GR.
  • FIG. 7 shows a fourth embodiment of the invention.
  • the molded body 5 of the manufacturing apparatus 1 according to this embodiment has two side surfaces 7 , but each side surface 7 is composed only of the vertical surface portion 9 .
  • the lower end portions 11 of the two vertical surface portions 9 are not connected, and each side surface 7 can independently form one glass ribbon GR1, GR2. That is, in the method for manufacturing a glass article according to the present embodiment, in the forming step, the plate-shaped molten glass GM flowing on one side surface 7 and the plate-shaped molten glass GM flowing on the other side surface 7 form the molded body 5. There is no fusion at each lower end 11 .
  • first glass ribbon GR1 the glass ribbon formed by one of the two side surfaces 7
  • second glass ribbon GR2 the glass ribbon formed by the other side surface 7
  • the cooling area 3 of the manufacturing apparatus 1 includes a first cooling device 12a that cools the first glass ribbon GR1 and a second cooling device 12b that cools the second glass ribbon GR2.
  • the first cooling device 12a includes a first cooling roller 13a and a first guide roller 15a that contact the first glass ribbon GR1, and a first driving device (not shown).
  • the second cooling device 12b includes a second cooling roller 13b and a second guide roller 15b that contact the second glass ribbon GR2, and a second driving device (not shown).
  • Each cooling device 12a, 12b has the same configuration as the cooling device 12 of the first embodiment.
  • the slow cooling region 4 of the manufacturing apparatus 1 includes first transport rollers 30a that transport the first glass ribbon GR1 and second transport rollers 30b that transport the second glass ribbon GR2.
  • Each transport roller 30a, 30b has the same configuration as the transport roller 30 of the first embodiment.
  • the molten glass GM overflowing from the overflow groove 6 is caused to flow down along the two side surfaces 7, thereby simultaneously forming two glass ribbons GR1 and GR2. do.
  • cooling of the first glass ribbon GR1 and the second glass ribbon GR2 by the cooling rollers 13a, 13b and the guide rollers 15a, 15b of the cooling devices 12a, 12b proceeds simultaneously.
  • the glass ribbons GR1 and GR2 are simultaneously conveyed by the conveyance rollers 30a and 30b.
  • FIG. 8 shows a fifth embodiment of the present invention. This embodiment differs from the above embodiment in the configuration of the cooling rollers in the cooling device of the manufacturing apparatus.
  • the inner tube 17 is partitioned by the partition member 19, but the inner tube 17 according to this embodiment does not include the partition member 19.
  • the inner tube 17 in this embodiment is a single tube extending from one end (first shaft portion 18A side) of the outer tube 16 to the other end (second shaft portion 18B side).
  • the supply flow path 21 configured inside the inner tube 17 extends from one end (first shaft portion 18A) side and the other end (second shaft portion 18B) side of the outer tube 16 toward an intermediate portion in the longitudinal direction. Circulate the refrigerant.
  • the supply flow path 21 configured inside the inner tube 17 is arranged on the one end (first shaft portion 18A) side and the other end (second shaft portion 18A) side of the outer tube 16. 18B) side toward the middle portion in the longitudinal direction, but the refrigerant may flow from one end portion (first shaft portion 18A) side toward the other end portion (second shaft portion 18B) side. , the refrigerant may flow from the other end portion (second shaft portion 18B) side toward the one end portion (first shaft portion 18A) side.
  • the discharge channels 23a and 23b for discharging the coolant that has flowed through the cooling channel 22 are provided at both ends of the outer tube 16. It may be provided only at one end.
  • the glass ribbon GR is formed from the molten glass GM by the overflow down-draw method, but the glass ribbon GR may be formed from the molten glass GM by the slit down-draw method.

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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)
PCT/JP2022/044614 2021-12-17 2022-12-02 ガラス物品の製造装置及び製造方法 Ceased WO2023112731A1 (ja)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10291827A (ja) * 1997-04-16 1998-11-04 Hoya Corp ガラス板の製造方法及び製造装置
JP2011505322A (ja) * 2007-11-29 2011-02-24 コーニング インコーポレイテッド 少なくとも１つの極めて高い表面品質の面を呈示するガラス板の製造装置と製造方法
WO2012169429A1 (ja) * 2011-06-07 2012-12-13 旭硝子株式会社 ガラス成形装置、ガラスの成形方法
JP2014520059A (ja) * 2011-05-31 2014-08-21 コーニング インコーポレイテッド 精密ガラスロール成形プロセスおよび装置
WO2018088029A1 (ja) * 2016-11-11 2018-05-17 日本電気硝子株式会社 板ガラス製造方法及び板ガラス製造装置
WO2018110233A1 (ja) * 2016-12-15 2018-06-21 日本電気硝子株式会社 ガラス物品の製造方法
WO2020031811A1 (ja) * 2018-08-09 2020-02-13 Ａｇｃ株式会社 板ガラスの製造方法
WO2021221910A1 (en) * 2020-04-29 2021-11-04 Corning Incorporated Methods for manufacturing low liquidus viscosity sheet glass

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10291827A (ja) * 1997-04-16 1998-11-04 Hoya Corp ガラス板の製造方法及び製造装置
JP2011505322A (ja) * 2007-11-29 2011-02-24 コーニング インコーポレイテッド 少なくとも１つの極めて高い表面品質の面を呈示するガラス板の製造装置と製造方法
JP2014520059A (ja) * 2011-05-31 2014-08-21 コーニング インコーポレイテッド 精密ガラスロール成形プロセスおよび装置
WO2012169429A1 (ja) * 2011-06-07 2012-12-13 旭硝子株式会社 ガラス成形装置、ガラスの成形方法
WO2018088029A1 (ja) * 2016-11-11 2018-05-17 日本電気硝子株式会社 板ガラス製造方法及び板ガラス製造装置
WO2018110233A1 (ja) * 2016-12-15 2018-06-21 日本電気硝子株式会社 ガラス物品の製造方法
WO2020031811A1 (ja) * 2018-08-09 2020-02-13 Ａｇｃ株式会社 板ガラスの製造方法
WO2021221910A1 (en) * 2020-04-29 2021-11-04 Corning Incorporated Methods for manufacturing low liquidus viscosity sheet glass

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