WO2020130075A1 - Procédé de production d'article en verre et dispositif de production associé - Google Patents

Procédé de production d'article en verre et dispositif de production associé Download PDF

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Publication number
WO2020130075A1
WO2020130075A1 PCT/JP2019/049831 JP2019049831W WO2020130075A1 WO 2020130075 A1 WO2020130075 A1 WO 2020130075A1 JP 2019049831 W JP2019049831 W JP 2019049831W WO 2020130075 A1 WO2020130075 A1 WO 2020130075A1
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WIPO (PCT)
Prior art keywords
glass
glass ribbon
ribbon
manufacturing
glass article
Prior art date
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PCT/JP2019/049831
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English (en)
Japanese (ja)
Inventor
睦 深田
Original Assignee
日本電気硝子株式会社
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Publication date
Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Priority to JP2020561507A priority Critical patent/JP7475284B2/ja
Publication of WO2020130075A1 publication Critical patent/WO2020130075A1/fr

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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
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

Definitions

  • the present invention relates to a glass article manufacturing method and a manufacturing apparatus thereof.
  • a glass ribbon is continuously formed from molten glass by a known forming method such as an overflow downdraw method or a float method.
  • the molded glass ribbon is cooled to near room temperature while being transported to the downstream side, and then cut into predetermined lengths to obtain a glass plate, or wound into a roll shape to obtain a glass roll.
  • a known forming method such as an overflow downdraw method or a float method.
  • the present inventor has discovered a new problem that, depending on the glass composition, a concave defect in which the front and back surfaces of the glass ribbon are both recessed may be formed in the glass article manufacturing process.
  • Such concave defects may reduce the smoothness or the transparency of the front and back surfaces of the glass article, and thus it is desired to reduce them as much as possible.
  • the present invention aims to reliably reduce the occurrence of concave defects in which the front and back surfaces of the glass ribbon are both recessed.
  • the present invention which was devised to solve the above problems, is a method for producing a glass article comprising a forming step of forming a glass ribbon from molten glass, and a conveying step of conveying the glass ribbon that has undergone the forming step.
  • the present invention is characterized by including an inspection step for inspecting the presence or absence of a concave defect in which the front and back surfaces of the glass ribbon are both concave, and a countermeasure process for taking a measure to reduce the concave defect.
  • the inspection target in the inspection step may be a glass ribbon or a glass article (for example, a glass plate) obtained from the glass ribbon.
  • the concave defect Occurrence can be reliably reduced.
  • the cause of the concave defect will be described later.
  • the molten glass is preferably an aluminosilicate glass containing MgO.
  • the molten glass has a glass composition of, by mass%, SiO 2 50 to 80%, Al 2 O 3 5 to 25%, B 2 O 3 0 to 15%, Na 2 O 1 to 20%, It is preferable to contain K 2 O 0 to 10%, MgO 1 to 5%, P 2 O 5 0.5 to 10%, and LiO 2 0 to 5%.
  • the glass composition is such that concave defects of the glass ribbon are likely to occur, so that the method for producing a glass article according to the present invention is particularly useful.
  • the countermeasure process includes a control process that adjusts the transport speed of the glass ribbon in the transport process according to the occurrence status of the concave defect detected in the inspection process.
  • the present inventor has found that the occurrence rate of concave defects varies depending on the residence time of the glass ribbon in the high temperature region near the molding process. That is, when a concave defect in which the front and back surfaces of the glass ribbon are both concave is detected in the inspection process, in the control process, the conveyance speed of the glass ribbon is adjusted according to the occurrence state of the concave defect, and a high temperature region near the molding process is detected. By appropriately managing the staying time of the glass ribbon in the above, the occurrence of concave defects can be surely reduced.
  • the inventor has confirmed that the occurrence of concave defects is reduced by increasing the glass ribbon transport speed and shortening the staying time of the glass ribbon in the high temperature region near the molding process. Therefore, when the occurrence of concave defects increases, it is preferable to increase the glass ribbon transport speed to shorten the residence time of the glass ribbon in the high temperature region near the molding step, as in the above configuration.
  • control step it is preferable to increase the flow rate of the molten glass in the forming step when the glass ribbon conveyance speed is increased.
  • the downdraw method is used to flow molten glass along the surface of the molded body to form a glass ribbon, and in the control step, depending on the occurrence status of the concave defect detected in the inspection step.
  • the downdraw method is used to flow the molten glass along the surface of the molded body to mold the glass ribbon, and the countermeasure step is It is preferable to previously provide a selection step of selecting a refractory material containing Mg as a refractory material for the molded body.
  • the present inventor has found that when the molten glass is an aluminosilicate glass containing MgO, the presence of the Mg-rich region at the interface between the molded body and the molten glass reduces the concave defects of the glass ribbon. I came to find out. That is, as described above, if a refractory containing Mg is selected as the refractory of the molded body, since the Mg-rich region derived from the refractory exists on the surface of the molded body, the concave defects of the glass ribbon can be reliably reduced. it can.
  • the downdraw method is used to flow the molten glass along the surface of the molded body to mold the glass ribbon, and the countermeasure step is It is preferable to include a forming step of forming an Mg-rich layer containing Mg on the surface of the molded body in advance.
  • the present inventor has found that when the molten glass is an aluminosilicate glass containing MgO, the presence of the Mg-rich region at the interface between the molded body and the molten glass reduces the concave defects of the glass ribbon. I came to find out. That is, as described above, if the Mg-rich layer is formed on the surface of the molded body, since the Mg-rich region derived from the Mg-rich layer exists at the interface between the molded body and the molten glass, the concave defect of the glass ribbon can be surely ensured. Can be reduced to
  • the concave defect has, for example, a depth of 1 nm to 1 ⁇ m, a length of 0.1 to 20 mm, and a width of 0.1 to 10 mm.
  • the present invention which was devised to solve the above-mentioned problems, is a method for producing a glass article including a forming step of forming a glass ribbon by causing a molten glass to flow down along the surface of a formed body by a downdraw method.
  • the molten glass is an aluminosilicate glass containing MgO, and the molded body is made of a refractory containing Mg.
  • the present invention which was devised to solve the above-mentioned problems, is a method for producing a glass article including a forming step of forming a glass ribbon by causing a molten glass to flow down along the surface of a formed body by a downdraw method.
  • the molten glass is an aluminosilicate glass containing MgO, and the molded body is characterized by having a Mg-rich layer containing Mg on the surface of the molded body.
  • the present invention was devised to solve the above problems, a molding zone for molding a glass ribbon from molten glass, and a transport zone for transporting the glass ribbon on the downstream side of the molding zone, a glass article manufacturing apparatus comprising.
  • the present invention it is possible to reliably reduce the occurrence of concave defects in which the front and back surfaces of the glass ribbon are both recessed.
  • FIG. 2B is a sectional view taken along line AA of FIG. 2A. It is a figure which shows an example of the temperature range in which a concave defect is formed. It is a figure which shows an example of the temperature range in which a concave defect is formed. It is a figure which shows an example of the temperature range in which a concave defect is formed. It is a figure which shows an example of the temperature range in which a concave defect is formed. It is a figure which shows an example of the temperature range in which a concave defect is formed. It is a figure which shows an example of the temperature range in which a concave defect is formed.
  • FIG. 6 is a vertical cross-sectional view showing a step of forming an Mg-rich layer formed on the surface of the molded body of FIG. 5.
  • XYZ in the figure is an orthogonal coordinate system.
  • the X and Y directions are horizontal, and the Z direction is vertical.
  • the X direction is the plate thickness direction of the glass ribbon G
  • the Y direction is the width direction of the glass ribbon G
  • the Z direction is the glass ribbon G conveyance direction (plate drawing direction).
  • corresponding components may be denoted by the same reference numerals, and redundant description may be omitted.
  • the glass article manufacturing apparatus is an apparatus for manufacturing a glass plate Gp as a glass article.
  • the manufacturing apparatus includes a glass ribbon G processing device 1, a cutting device 2, an inspection unit 3, and a control unit 4.
  • the processing apparatus 1 includes a molding zone 11 for continuously molding the glass ribbon G, a heat treatment zone 12 for heat-treating (gradual cooling) the glass ribbon G, a cooling zone 13 for cooling the glass ribbon G to near room temperature, a molding zone 11,
  • Each of the heat treatment zone 12 and the cooling zone 13 is provided with a pair of rollers 14 provided in a plurality of upper and lower stages.
  • the region from the lower end 15c of the molded body 15 to the folding position (cutting position) P2 is the glass ribbon G transport zone. That is, in this embodiment, the transport zone includes the heat treatment zone 12 and the cooling zone 13.
  • the molding zone 11 and the heat treatment zone 12 are constituted by a furnace in which the periphery of the glass ribbon G transport path is surrounded by a wall portion, and a heating device such as a heater for adjusting the temperature of the glass ribbon G is placed at an appropriate position in the furnace. It is arranged.
  • the cooling zone 13 is open to the outside atmosphere at room temperature without being surrounded by the wall portion around the glass ribbon G transport path, and no heating device such as a heater is arranged.
  • a desired thermal history is imparted to the glass ribbon G by passing through the heat treatment zone 12 and the cooling zone 13.
  • a molded body 15 for molding the glass ribbon G from the molten glass Gm by the overflow down draw method is arranged in the internal space of the molding zone 11.
  • the molten glass Gm supplied to the molded body 15 overflows from a groove (not shown) formed in the top portion 15a of the molded body 15, and the overflowed molten glass Gm forms a wedge-shaped cross section of the molded body 15.
  • the plate-shaped glass ribbon G is continuously formed by joining the present side surfaces 15b and joining at the lower end 15c.
  • the formed glass ribbon G has a vertical posture (preferably a vertical posture).
  • the glass ribbon G and the glass plate Gp have substantially the same glass composition as the molten glass Gm.
  • the molded body 15 is an alumina-based molded body.
  • the alumina-based compact is preferably a compact having an Al 2 O 3 content of 90 mass% or more.
  • the molded body 15 may be a zircon-based molded body or the like.
  • zircon-based molded body when the molten glass Gm having a specific tempered glass composition is flowed down, zirconia derived from the molded body 15 is mixed into the molten glass Gm, and the glass ribbon G and/or the glass plate Gp. May result in defects. Therefore, from the viewpoint of preventing the occurrence of such defects due to zirconia, the molded body 15 is more preferably an alumina-based molded body.
  • the internal space of the heat treatment zone 12 has a predetermined temperature gradient downward.
  • the glass ribbon G in the vertical posture is heat-treated (slowly cooled) so that its temperature becomes lower as it moves downward in the internal space of the heat-treatment zone 12. This heat treatment reduces the internal strain of the glass ribbon G.
  • the temperature gradient in the internal space of the heat treatment zone 12 can be adjusted by, for example, a heating device provided on the inner surface of the wall of the heat treatment zone 12.
  • the plurality of roller pairs 14 are designed to sandwich both ends of the glass ribbon G in the vertical position in the width direction from the front and back sides.
  • the uppermost roller pair is a cooling roller 14a having a cooling mechanism inside.
  • the plurality of roller pairs 14 may include a pair of rollers that do not sandwich both ends of the glass ribbon G in the width direction. That is, the facing interval of the roller pair 14 may be made larger than the plate thickness of both ends of the glass ribbon G in the width direction so that the glass ribbon G passes between the roller pair 14.
  • both end portions in the width direction of the glass ribbon G obtained by the processing apparatus 1 have a larger plate thickness than the center portion in the width direction (hereinafter, referred to as “ear”) due to the influence of shrinkage in the molding process. (Also referred to as "part").
  • the cutting device 2 includes a scribing line forming device 21 and a breaking device 22, and is configured to cut the glass ribbon G in the vertical posture, which has descended from the processing device 1, in predetermined widths in the width direction. ing. As a result, the glass plates Gp are sequentially cut out from the glass ribbon G.
  • the glass plate Gp is a glass original plate (mother glass plate) from which one or more product glass plates are collected.
  • the plate thickness of the glass plate Gp is, for example, 0.2 mm to 10 mm, and the size of the glass plate Gp is, for example, 700 mm ⁇ 700 mm to 3000 mm ⁇ 3000 mm.
  • the glass plate Gp is used as, for example, a display substrate or a cover glass.
  • the substrate and cover glass of the display are not limited to flat panels.
  • the scribe line forming device 21 is a device that forms a scribe line S on one of the front and back surfaces of the glass ribbon G at the scribe line forming position P1 provided below the processing device 1.
  • the scribe line forming device 21 forms a scribe line S along one of the front and back surfaces of the glass ribbon G along the width direction thereof, and the glass ribbon G at a position corresponding to the wheel cutter 23.
  • a support member 24 (for example, a support bar or a support roller) that supports the other surface of the front and back surfaces.
  • the wheel cutter 23 and the support member 24 are configured to follow the descending glass ribbon G and form the scribe line S in the entire area or a part of the glass ribbon G in the width direction.
  • the scribe line S is also formed at both widthwise end portions including the ear portions having a relatively large plate thickness.
  • the scribe line S may be formed by laser irradiation or the like.
  • the folding device 22 is a device that obtains the glass plate Gp by breaking the glass ribbon G along the scribe line S at the breaking position P2 provided below the scribe line forming position P1.
  • the splitting device 22 includes a splitting member 25 that comes into contact with a formation side of the scribe line S from a surface side where the scribe line S is not formed, and a lower portion of the glass ribbon G below the split position P2. And a chuck 26 for gripping the area.
  • the splitting member 25 is composed of a plate-like body (a surface plate) having a flat surface that comes into contact with the whole or a part of the glass ribbon G in the width direction while following the descending glass ribbon G.
  • the contact surface of the split member 25 may be a curved surface curved in the width direction.
  • a plurality of chucks 26 are provided at both ends of the glass ribbon G in the width direction, with a gap in the longitudinal direction of the glass ribbon G.
  • the plurality of chucks 26 provided at the respective ends in the width direction are all held by the same arm (not shown).
  • a plurality of chucks 26 follow the descending glass ribbon G and descend, while performing an operation to bend the glass ribbon G with the folding member 25 as a fulcrum.
  • bending stress is applied to the scribe line S and its vicinity, and the glass ribbon G is split along the scribe line S in the width direction.
  • the glass plate Gp is cut out from the glass ribbon G.
  • the cut glass plate Gp is transferred from the chuck 26 to the chuck 28 of another transfer device 27, and then is conveyed in the width direction (Y direction) in the vertical posture.
  • the transport direction of the glass sheet Gp by the transport device 27 is not limited to the width direction and can be set in any direction.
  • the chucks 26 and 28 may be changed to other holding modes such as negative pressure suction.
  • the inspection unit 3 is a device for inspecting the presence or absence of the concave defect F shown in FIGS. 2A and 2B.
  • the concave defect F is a minute recess in which both the front and back surfaces of the glass plate Gp are recessed. Since the concave defect F is a surface defect, a known inspection device for inspecting the presence or absence of a surface defect can be used for the inspection unit 3.
  • the surface defects include, for example, protrusion defects, scratches, stains and the like.
  • the inspection unit 3 inspects the glass plate Gp cut out from the glass ribbon G in order to inspect the presence or absence of the concave defect F.
  • the inspection unit 3 is arranged at a fixed position on one surface side of the front and back surfaces of the glass plate Gp, and a fixed position on the other surface side of the front and back surfaces of the glass plate Gp.
  • a sensor 32 The light source 31 emits light toward the glass plate Gp, and the sensor 32 receives the light emitted from the light source 31 and transmitted through the glass plate Gp.
  • the inspection unit 3 detects the presence or absence of a surface defect based on the change in the amount of light received by the sensor 32.
  • the inspectable area by the light source 31 and the sensor 32 of the inspection unit 3 is a line extending in the Z direction.
  • the inspection area by the light source 31 and the sensor 32 is scanned over the entire front and back surfaces of the glass plate Gp by moving the glass plate Gp by the transport device 27. Thereby, the presence or absence of surface defects including the concave defect F is inspected.
  • the glass sheet Gp in which the surface defect is detected is sampled from the transportation path of the transportation device 27 in order to identify the type of the surface defect.
  • a white light interference microscope for example, VertScan (registered trademark) manufactured by Ryoka System Co., Ltd.
  • VertScan registered trademark manufactured by Ryoka System Co., Ltd.
  • the cross-sectional shape of the surface defect of the glass plate Gp is observed with a white light interference microscope, and when a concave portion satisfying a predetermined criterion is detected on the front and back surfaces, the concave defect F is formed on the glass plate Gp. It can be determined that there is.
  • the criterion is set to a value in consideration of the size of the detected recess, such as the depth of the detected recess in the plate thickness direction, the length in the transport direction, and the width in the direction orthogonal to the transport direction.
  • the concave defect F has a stripe shape extending along the transport direction, and for example, the depth D in the plate thickness direction is 1 nm to 1 ⁇ m, and the length L in the transport direction is 0.1. ⁇ 20 mm, and the width W in the direction orthogonal to the carrying direction is 0.1 to 10 mm.
  • the length L of the concave defect F becomes longer as the conveyance speed of the glass ribbon G becomes faster, and becomes shorter as the conveyance speed of the glass ribbon G becomes slower.
  • the high temperature region H in which the concave defect F can be formed can be the four modes shown in FIGS. 3A to 3D. That is, in the first mode, as shown in FIG. 3A, the high temperature region H extends from the intermediate position of the side surface 15b of the molded body 15 to the position below the cooling roller 14a. In the second mode, as shown in FIG. 3B, the high temperature region H is from the intermediate position of the side surface 15b of the molded body 15 to the position below the lower end 15c of the molded body 15 and above the cooling roller 14a. In the third mode, as shown in FIG. 3C, the high temperature region H extends from a position below the lower end 15c of the molded body 15 to a position above the cooling roller 14a.
  • the high temperature region H extends from a position below the lower end 15c of the molded body 15 and above the cooling roller 14a to a position below the cooling roller 14a.
  • the transport speed (plate drawing speed) of the glass ribbon G is increased, the temperature gradient in the up-down direction of the glass ribbon G is maintained constant. Can be shortened.
  • the following two causes can be considered as the cause of the concave defect F. That is, it is considered that the first cause is the phase separation of the glass that occurs in the high temperature region H. This is because the concave defect F tends to increase when a glass composition that easily causes phase separation is selected. Therefore, the high temperature region H may be set based on the temperature at which the glass undergoes phase separation.
  • the second cause is considered to be the diffusion (movement) of Mg ions from the molten glass Gm containing MgO to the compact 15.
  • the cause of the concave defect F has not been clarified yet, but the second cause is the most prominent one.
  • the molten glass Gm (glass ribbon G) is an aluminosilicate glass containing MgO
  • concave defects F are likely to occur on the glass ribbon G.
  • the glass composition of the molten glass Gm is, by mass%, SiO 2 50 to 80%, Al 2 O 3 5 to 25%, B 2 O 3 0 to 15%, Na 2 O 1 to 20%. , K 2 O 0 to 10%, MgO 1 to 5%, P 2 O 5 0.5 to 10%, and LiO 2 0 to 5%, concave defects F are likely to occur in the glass ribbon G.
  • the high temperature region H in which the concave defect F can be formed is, for example, 800 to 1100°C.
  • the glass composition range is regulated as described above, it becomes easy to achieve both a high level of ion exchange performance and devitrification resistance in the glass ribbon G. Therefore, a glass ribbon G suitable for a glass plate for chemical strengthening used for a cover glass of a mobile phone, a digital camera, a PDA (mobile terminal), a touch panel display or the like can be obtained.
  • MgO is a component that lowers the high temperature viscosity to improve the meltability and moldability, and also increases the strain point and Young's modulus.
  • MgO has a great effect of enhancing the ion exchange performance. It is an ingredient.
  • the preferable upper limit range of MgO is 5% or less, particularly 4% or less, and the preferable lower limit range of MgO is 2% or more.
  • P 2 O 5 is a component that enhances the ion exchange performance when chemically strengthening the glass, and is particularly a component that increases the stress depth of the compressive stress layer. Further, as the content of P 2 O 5 increases, the glass is likely to undergo phase separation, and the concave defect F is likely to occur.
  • the lower limit of P 2 O 5 is preferably 2%, more preferably 4%.
  • the upper limit of P 2 O 5 is preferably 8%, more preferably 6%.
  • Li 2 O is an ion-exchange component and also a component that lowers the high temperature viscosity and improves the meltability and moldability. It is also a component that enhances Young's modulus. Furthermore, among the alkali metal oxides, the effect of increasing the compressive stress value is great. However, if the content of Li 2 O is too large, the liquidus viscosity is lowered, and the glass tends to devitrify. In addition, the thermal expansion coefficient becomes too high, and the thermal shock resistance decreases, and it becomes difficult to match the thermal expansion coefficient of the peripheral materials. Further, if the low temperature viscosity becomes too low and stress relaxation easily occurs, the compressive stress value may rather decrease. Therefore, the content of Li 2 O is preferably 0 to 3.5%, 0 to 2%, 0 to 1%, 0 to 0.5%, and particularly 0.01 to 0.2%.
  • control unit 4 is configured to adjust the transport speed (drawing speed) of the glass ribbon G according to the detected occurrence state of the concave defect F. Specifically, the control unit 4 increases the transport speed of the glass ribbon G by increasing the rotation speed of the cooling roller 14a when the occurrence of the concave defect F increases.
  • the control unit 4 is configured to increase the flow rate of the molten glass Gm supplied to the molded body 15 when increasing the transport speed of the glass ribbon G. At this time, the flow rate of the glass ribbon G may be finely adjusted so as to prevent a decrease in the plate thickness of the glass ribbon G due to an increase in the transport speed.
  • the glass article manufacturing method includes a forming step, a heat treatment step, a cooling step, a cutting step, an inspection step, and a countermeasure step.
  • a part of the heat treatment step, the cooling step and the cutting step also serves as a carrying step for carrying the glass ribbon G.
  • the glass ribbon G is molded in the molding zone 11.
  • the heat treatment step is a step of performing heat treatment on the glass ribbon G that has undergone the forming step in the heat treatment zone 12.
  • the cooling step is a step of cooling the glass ribbon G that has undergone the heat treatment step in the cooling zone 13.
  • the cutting step is a step of cutting the glass ribbon G in the width direction by the cutting device 2 to obtain the glass plate Gp while conveying the glass ribbon G that has undergone the cooling step.
  • the inspection process is a process of inspecting the glass plate Gp for a concave defect F by the inspection unit 3 or the like.
  • the presence or absence of the concave defect F is inspected by a predetermined criterion.
  • the countermeasure process is a process for reducing the concave defect F on the glass ribbon.
  • the countermeasure process includes a control process that adjusts the transport speed of the glass ribbon G according to the occurrence status of the concave defect F detected in the inspection process.
  • the cooling roller 14a increases the conveyance speed of the glass ribbon G and controls the occurrence of the concave defect F to be equal to or less than a predetermined target value.
  • the target value relates to the concave defects F such as the generation rate of the glass plates Gp having the concave defects F, the number of the glass plates Gp having the concave defects F, the number of the concave defects F per glass plate Gp, and the like.
  • Arbitrary parameters can be set. In this way, when the occurrence of the concave defect F is increased, the conveyance speed of the glass ribbon G is increased, so that the residence time of the glass ribbon G in the high temperature region H near the molded body 15 is shortened.
  • the contact time between the molded body 15 and the molten glass Gm is shortened, even if the molten glass Gm contains MgO, the amount of Mg ions diffused from the molten glass Gm into the molded body 15 is inevitable. Less. Therefore, the concave defect F of the glass ribbon G can be reliably reduced.
  • the conveying speed of the glass ribbon G is reduced, the staying time of the glass ribbon G in the high temperature region H near the molded body 15 becomes longer.
  • the contact time between the molded body 15 and the molten glass Gm also becomes long, the amount of Mg ions diffused from the glass ribbon Gm to the molded body 15 inevitably increases. Therefore, the concave defect F of the glass ribbon G may increase.
  • the flow rate of the molten glass Gm supplied to the molded body 15 is also increased. By doing so, it is possible to prevent the thickness of the glass ribbon G from decreasing with an increase in the transport speed, and to keep the thickness of the glass ribbon G constant.
  • FIG. 4 is a diagram showing countermeasure steps included in the method for manufacturing a glass article according to the second embodiment.
  • the countermeasure process includes a selection process of selecting a refractory material containing Mg as a refractory material of the molded body 15 before molding the glass ribbon G as a product.
  • the content of Mg in the molded body 15 is preferably 1 to 5 mass %.
  • the content of Mg be smaller than the content of Al 2 O 3 .
  • the Mg-rich layer R1 having a high Mg concentration exists in the surface layer portion of the molded body 15. It will be. Therefore, even if the glass ribbon G is an aluminosilicate glass containing MgO, the Mg rich layer R1 functions as a diffusion suppressing layer that suppresses diffusion of Mg ions. Therefore, it is possible to reliably suppress the diffusion of Mg ions from the molten glass Gm to the molded body 15, and it is possible to reliably reduce the concave defects F of the glass ribbon G.
  • FIG. 5 is a figure which shows the countermeasure process included in the manufacturing method of the glass article which concerns on 3rd embodiment.
  • the countermeasure step is a step of forming the Mg-rich layer R2 containing Mg on the surface (for example, the top portion 15a and the side surface 15b) of the formed body 15 before the forming step of forming the glass ribbon G as a product. It has a process.
  • the Mg content in the Mg rich layer R2 is preferably larger than the amount of Mg that can diffuse from the molten glass Gm. Specifically, the content of Mg in the Mg rich layer R2 is preferably, for example, 1% by mass or more.
  • the Mg rich layer R2 preferably contains spinel (MgAl 2 O 4 ) as a main component.
  • spinel MgAl 2 O 4
  • the Mg-rich layer R2 containing spinel can be easily formed on the surface of the compact 15.
  • the upper limit of the Mg content in the Mg rich layer R2 is 17% by mass. Therefore, the content of Mg in the Mg-rich layer R2 is preferably 17% by mass or less, not limited to the case where the main component of the Mg-rich layer R2 is spinel.
  • the thickness of the Mg-rich layer R2 is preferably 100 ⁇ m or less, more preferably 20 ⁇ m to 100 ⁇ m, and most preferably 50 ⁇ m to 100 ⁇ m.
  • the Mg-rich layer R2 By forming the Mg-rich layer R2 on the surface of the molded body 15 in this manner, a layer having a high Mg concentration exists at the interface between the molded body 15 and the molten glass Gm. Therefore, even if the glass ribbon G is an aluminosilicate glass containing MgO, the Mg rich layer R2 functions as a diffusion suppressing layer that suppresses diffusion of Mg ions. Therefore, it is possible to reliably suppress the diffusion of Mg ions from the molten glass Gm to the molded body 15, and it is possible to reliably reduce the concave defects F of the glass ribbon G.
  • the second molten glass Gm1 containing MgO is caused to flow down along the surface of the molded body 15 to form the Mg rich layer R2.
  • the second molten glass Gm1 containing MgO when the second molten glass Gm1 containing MgO is caused to flow down along the surface of the molded body 15, Mg ions diffuse from the second molten glass Gm1 into the molded body 15 and the Mg-rich layer is formed on the surface of the molded body 15. MR is formed. After that, when the diffusion of Mg ions from the second molten glass Gm1 to the molded body 15 continues, the thickness of the Mg rich layer R2 increases to a predetermined thickness. As a result, the Mg-rich layer R2 is sufficiently formed on the surface of the molded body 15.
  • the alumina of the molded body 15 reacts with MgO of the second molten glass Gm1 to form the Mg-rich layer R2 containing spinel as a main component in the above forming step. ..
  • the second molten glass Gm1 for forming the Mg-rich layer R2 preferably has a glass composition which is the same as or similar to the molten glass Gm used when forming the glass ribbon G to be a product. It is preferably an aluminosilicate glass containing MgO.
  • the molten glass supplied to the molded body 15 is gradually changed from the second molten glass Gm1 to the molten glass Gm after forming the Mg rich layer R2. Perform a material replacement process. The molding process starts after the material replacement process is completed.
  • the second molten glass Gm1 can be, for example, a non-alkali glass containing MgO.
  • the alkali-free glass is, for example, in mass%, SiO 2 50 to 70%, Al 2 O 3 12 to 25%, B 2 O 3 0 to 12%, Li 2 O+Na 2 O+K 2 O (Li 2 O, Na 2 The total content of O and K 2 O)
  • the composition may contain 0 to less than 1%, MgO 1 to 8%, CaO 0 to 15%, SrO 0 to 12%, and BaO 0 to 15%.
  • the method for forming the Mg-rich layer R2 is not limited to this.
  • the Mg rich layer R2 may be formed by sputtering film formation.
  • the glass plate according to each example is an aluminosilicate glass containing MgO, and has a glass composition of mass% of SiO 2 53.59%, Al 2 O 3 20.0%, B 2 O 3 0.5%. , Na 2 O 13.7%, K 2 O 4.4%, MgO 2.1%, P 2 O 5 5.4%, Li 2 O 0.01%, SnO 2 0.3%.
  • the size of the glass plate according to each example is 2350 mm ⁇ 2560 mm.
  • Example 7 was performed according to the third embodiment described above.
  • an alkali-free glass (second molten glass Gm1) containing 4% by mass of MgO was flowed down along the surface of the molded body 15 to form the Mg-rich layer R2.
  • the forming process was performed for about 30 days.
  • a glass plate of aluminosilicate glass containing MgO was obtained under the conditions of Example 6 described above. As a result, the rate of occurrence of concave defects was reduced to 5%.
  • the glass ribbon G was cut by scribe cutting, but it may be cut by another method such as laser cutting or laser fusing.
  • a cutting step of cutting the ears of the glass plate Gp may be further provided before the inspection step of inspecting the presence or absence of the concave defect F.
  • the second inspection process for inspecting the presence or absence of other defects such as bubbles and foreign substances on the glass plate Gp may be performed.
  • the glass article is the glass plate Gp
  • the glass article may be, for example, a glass roll obtained by winding the glass ribbon G into a roll.
  • control unit 4 automatically adjusts the transport speed of the glass ribbon G according to the occurrence status of the detected concave defect F has been described.
  • the conveying speed of the glass ribbon G and the flow rate of the molten glass Gm may be manually adjusted according to the generation situation.
  • the method for manufacturing a glass article may further include a strengthening step of chemically strengthening the glass plate Gp (chemical strengthening glass plate).
  • the molten glass Gm is an aluminosilicate glass
  • the molten glass Gm is not limited to this.
  • Processing Device 2 Cutting Device 3 Inspection Unit 4 Control Unit 11 Forming Zone 12 Heat Treatment Zone 13 Cooling Zone 14a Roller Pair (Cooling Roller) 15 Molded body 21 Scribing line forming device 22 Folding device 23 Wheel cutter 24 Support member 25 Folding member 27 Conveying device F Concave defect G Glass ribbon Gm Molten glass Gp Glass plate R1 Mg rich layer R2 Mg rich layer

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Glass Compositions (AREA)

Abstract

Le procédé de production d'article en verre selon l'invention comprend une étape de formation consistant à former un ruban de verre (G) à partir d'un verre fondu (Gm) et une étape de transport consistant à transporter le ruban de verre (G), le procédé comprenant une étape d'examen consistant à examiner si un défaut en forme d'évidement est présent ou non, les surfaces avant et arrière du ruban de verre (G) s'enfonçant toute les deux, et une étape de régulation consistant à ajuster la vitesse de transport du ruban de verre (G) dans l'étape de transport, en réponse à l'état d'occurrence de la détection d'un défaut en forme d'évidement durant l'étape d'examen.
PCT/JP2019/049831 2018-12-21 2019-12-19 Procédé de production d'article en verre et dispositif de production associé WO2020130075A1 (fr)

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WO2022255040A1 (fr) * 2021-05-31 2022-12-08 日本電気硝子株式会社 Procédé de production d'un article en verre

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JP2010030876A (ja) * 2008-06-27 2010-02-12 Nippon Electric Glass Co Ltd 強化ガラスおよびその製造方法
JP2013151415A (ja) * 2011-03-30 2013-08-08 Avanstrate Inc ガラス板の製造方法及びガラス板製造装置
JP2014515721A (ja) * 2011-04-13 2014-07-03 サン−ゴバン セラミックス アンド プラスティクス，インコーポレイティド βアルミナを含む耐火物ならびにその製造および使用方法
JP2016190764A (ja) * 2015-03-31 2016-11-10 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、および、ガラス基板の製造装置

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EP2694452A4 (fr) * 2011-03-30 2015-03-11 Saint Gobain Ceramics Objet réfractaire, bloc formant un déversoir de verre, et procédé de formation et d'utilisation de l'objet réfractaire
KR102037046B1 (ko) * 2012-01-11 2019-10-29 생-고뱅 세라믹스 앤드 플라스틱스, 인코포레이티드 내화체 및 내화체를 이용한 유리판 성형방법

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JP2010030876A (ja) * 2008-06-27 2010-02-12 Nippon Electric Glass Co Ltd 強化ガラスおよびその製造方法
JP2013151415A (ja) * 2011-03-30 2013-08-08 Avanstrate Inc ガラス板の製造方法及びガラス板製造装置
JP2014515721A (ja) * 2011-04-13 2014-07-03 サン−ゴバン セラミックス アンド プラスティクス，インコーポレイティド βアルミナを含む耐火物ならびにその製造および使用方法
JP2016190764A (ja) * 2015-03-31 2016-11-10 ＡｖａｎＳｔｒａｔｅ株式会社 ガラス基板の製造方法、および、ガラス基板の製造装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022255040A1 (fr) * 2021-05-31 2022-12-08 日本電気硝子株式会社 Procédé de production d'un article en verre

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