WO2015174324A1 - Rouleau de transport pour transporter du verre, procédé de fabrication de verre l'utilisant et dispositif de fabrication de verre. - Google Patents

Rouleau de transport pour transporter du verre, procédé de fabrication de verre l'utilisant et dispositif de fabrication de verre. Download PDF

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Publication number
WO2015174324A1
WO2015174324A1 PCT/JP2015/063231 JP2015063231W WO2015174324A1 WO 2015174324 A1 WO2015174324 A1 WO 2015174324A1 JP 2015063231 W JP2015063231 W JP 2015063231W WO 2015174324 A1 WO2015174324 A1 WO 2015174324A1
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WO
WIPO (PCT)
Prior art keywords
glass
roll
buffer layer
transport
inorganic salt
Prior art date
Application number
PCT/JP2015/063231
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English (en)
Japanese (ja)
Inventor
泰成 石川
瑞樹 松岡
Original Assignee
旭硝子株式会社
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Filing date
Publication date
Application filed by 旭硝子株式会社 filed Critical 旭硝子株式会社
Publication of WO2015174324A1 publication Critical patent/WO2015174324A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/02—Adaptations of individual rollers and supports therefor
    • B65G39/06—Adaptations of individual rollers and supports therefor the roller sleeves being shock-absorbing, e.g. formed by helically-wound wires
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B35/00—Transporting of glass products during their manufacture, e.g. hot glass lenses, prisms
    • C03B35/14—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands
    • C03B35/16—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors
    • C03B35/18—Construction of the conveyor rollers ; Materials, coatings or coverings thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • 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 transport roll for transporting glass, a glass manufacturing method using the roll, and a glass manufacturing apparatus.
  • the glass ribbon In the manufacturing method of plate glass, in order to prevent the glass ribbon formed by the float method from cracking due to abrupt shrinkage and the decrease in flatness, the glass ribbon is transported on a transport roll in a slow cooling furnace and gradually cooled. It has been.
  • SO 2 gas sulfur dioxide or sulfurous acid gas
  • SO 2 gas is introduced into the slow cooling furnace, or SO 2 gas is sprayed onto the surface of the glass ribbon facing the roll, so And SO 2 are reacted to form a wrinkle-preventing protective layer on the glass ribbon surface, and a buffer layer is formed on the transport roll surface by transfer from the glass ribbon surface from the wrinkle-preventing protective layer.
  • the buffer layer which consists of a carbon film was formed in the conveyance roll surface (for example, patent document 6).
  • the present invention reduces the occurrence of wrinkles on the surface of the glass ribbon and improves the yield, a glass transport roll, and a glass manufacturing method using the same, and
  • One object is to provide a glass manufacturing apparatus.
  • a transport roll for transporting a glass ribbon or a glass plate wherein an inorganic salt buffer layer having a Vickers hardness of 30 or more is formed on a surface of the transport roll.
  • the formed conveyance roll for glass conveyance is provided.
  • a forming step of forming a glass ribbon from molten glass by a glass forming means and a transfer step of gradually cooling the glass ribbon to a temperature below the strain point of the glass while being transferred by a transfer roll.
  • the transporting step includes spraying an inorganic salt solution directly onto the surface of the transporting roll, and drying the solution adhering to the transporting roll, whereby an inorganic salt buffer layer having a Vickers hardness of 30 or more.
  • a glass manufacturing method including a buffer layer forming step of forming a film.
  • a float bath for forming a glass ribbon on a molten metal
  • a dross box having a lift-out roll adjacent to the float bath and pulling up the glass ribbon, and adjacent to the dross box And having a transport roll that transports the pulled glass ribbon, a slow cooling furnace that gradually cools the glass ribbon to a temperature below the strain point of the glass while transporting the glass ribbon by the transport roll, and the lift-out roll and the transport
  • At least one of the rolls is provided with a glass manufacturing apparatus having an inorganic salt buffer layer having a Vickers hardness of 30 or more on the surface.
  • the glass manufacturing process will be described with reference to FIG. 1, taking a plate glass manufacturing method by the float method as an example.
  • the manufacturing method of the glass by the float process is mentioned here as an example, the glass manufacturing method of this embodiment is not limited to the manufacturing method of the plate glass by the float process,
  • the glass ribbon of a conveyance roll is used after a formation process. As long as it involves conveyance, it can be applied to various glass manufacturing methods such as a roll-out method and a fusion method.
  • the molten glass is continuously supplied onto the molten metal 11 of the float bath 10, and the glass ribbon 12 is formed on the molten metal 11.
  • the float bath 10 is a glass forming means.
  • the molten glass is obtained by melting a glass raw material in the raw material melting step on the upstream side of FIG. 1, or further subjected to a defoaming treatment or the like depending on the case.
  • the glass ribbon 12 is pulled out of the float bath 10 from the exit of the float bath 10.
  • the glass ribbon 12 is drawn from the molten metal 11 by a lift-out roll 13 (hereinafter, a transport roll having a role of pulling out the glass ribbon 12 as a subordinate concept of the transport roll is referred to as a “lift-out roll”). Is lifted at the exit of the float bath 10 and conveyed. A place where the lift-out roll 13 exists is called a dross box 14.
  • the glass ribbon 12 drawn out from the float bath 10 is gradually lowered to a glass strain point temperature or lower while being conveyed on the conveying rolls R1 to R10 in the slow cooling furnace 15 in order to prevent cracking due to rapid shrinkage and reduction in flatness. To be cooled. The glass ribbon 12 after slow cooling is cut into a desired size as necessary.
  • the process in which the glass ribbon (or glass plate) 12 is conveyed by the conveyance roll including the lift-out roll 13 is defined as a conveyance process.
  • FIG. 1 shows the lift-out roll 13 and the transport roll in the slow cooling furnace 15, the transport process is not limited to the process transported by the lift-out roll 13 or the transport roll shown in FIG.
  • a conveyance process includes the process of conveying a glass ribbon or a glass plate with the lift-out roll or conveyance roll arrange
  • the surface of the transport roll has uneven portions (for example, wrinkles, deposits, etc.) If the tip portion has a sharp convex shape, etc.), the transport roll is in contact with the lower surface of the glass, so that the surface of the glass may be wrinkled depending on the shape of the uneven portion.
  • the glass manufacturing method of the present embodiment wrinkles generated on the glass surface can be reduced and the yield can be improved even when such an uneven portion is provided on the surface of the transport roll. Below, the glass manufacturing method of this embodiment is demonstrated.
  • an inorganic salt solution obtained by mixing an inorganic salt, which is a substance constituting the buffer layer, with a solvent is directly blown onto at least a part of the rotating transport roll.
  • a buffer layer forming step to be applied Since the solvent of the inorganic salt adhering to the transport roll evaporates and dries in a high-temperature atmosphere after the molding step, a buffer layer of the inorganic salt is formed in a short time at a predetermined portion of the transport roll.
  • the formation of the buffer layer on the conventional transport roll takes time because it is a transfer from the wrinkle prevention protective layer formed on the surface of the glass ribbon, but by spraying the inorganic salt solution directly on the transport roll in this way.
  • the buffer layer can be formed on the transport roll in a short time.
  • the buffer layer can be formed without interrupting the production of glass, which is preferable from the viewpoint of productivity.
  • the buffer layer forming step will be specifically described with reference to FIG.
  • FIG. 2 shows a solution containing an inorganic salt that is a substance constituting the buffer layer 23 (hereinafter also referred to as “dispersion liquid”) to the transport roll 21 as a buffer layer material solution supply nozzle (hereinafter simply referred to as “supply nozzle”).
  • supply nozzle a buffer layer material solution supply nozzle
  • the buffer layer raw material solution can be uniformly supplied to the surface of the transport roll 21, a uniform buffer layer 23 can be formed on a desired portion of the transport roll 21. it can.
  • the liquid in the buffer layer raw material solution supplied to the surface of the transport roll 21 evaporates, the material of the buffer layer 23 is deposited on the transport roll 21, and thus the buffer layer 23 with high adhesion to the transport roll 21. Can be formed.
  • the uniform buffer layer 23 can be formed by moving the supply nozzle 22 to the desired position of the transport roll 21 and spraying the buffer layer material. For this reason, it is preferable because spraying of the buffer layer material can be performed without interrupting the production of glass.
  • the formation of the buffer layer 23 can be performed even when glass is not manufactured.
  • the supply nozzle 22 is preferably configured to be movable in the length direction of the glass transport roll 21 (that is, the direction perpendicular to the paper surface of FIG. 2). This is because the buffer layer 23 having a desired width can be formed at a desired location on the transport roll 21 by configuring the supply nozzle 22 in this manner. Further, the surface shape of the buffer layer 23 is adjusted from the time when the solution (or dispersion liquid) containing the substance constituting the buffer layer 23 is sprayed by the supply nozzle 22 of the transport roll 21 until it comes into contact with the glass. For example, a surface pressing member of the buffer layer 23 may be provided, and the surface shape of the buffer layer 23 may be adjusted by the surface pressing member or the like.
  • the buffer layer 23 is formed on at least a part of the transport roll 21 after the forming step, that is, on the downstream side of the outlet of the float bath 10 which is a glass forming means. Can be prevented from occurring.
  • the shape of the buffer layer 23 is not particularly limited, and may be formed in a shape that prevents wrinkles.
  • the substance which comprises the buffer layer 23 is not specifically limited, It is preferable that the uneven
  • the buffer layer 23 has a Mohs hardness lower than the Mohs hardness of the glass ribbon 12, and does not cause wrinkles in the glass ribbon 12 being conveyed or alter the glass ribbon 12. It is preferable to include a substance that does not react with the glass ribbon 12 at the temperature during conveyance. Such a substance is preferably contained in the buffer layer 23, but is more preferably a main component of a substance constituting at least the surface portion of the buffer layer 23, and a main ingredient of the substance constituting the buffer layer 23. More preferably.
  • the Mohs hardness of the glass ribbon 12 means the Mohs hardness of the glass ribbon 12 at room temperature. For this reason, it is preferable that the Mohs hardness of the substance contained in the buffer layer 23 is 6.5 or less, for example, and it is more preferable that it is 4.5 or less.
  • the buffer layer 23 has a Vickers hardness of 30 or more, preferably 35 or more, more preferably 40 or more, still more preferably 50 or more, More preferably, it is 60 or more.
  • the Vickers hardness is high, the bonding force and adhesion between the particles constituting the buffer layer 23 are strong, and the particles are difficult to be peeled off, so that they are not easily transferred to the glass. Therefore, the life of the buffer layer 23 can be extended.
  • the substance constituting the buffer layer 23 preferably contains an inorganic salt, and particularly preferably contains at least one substance selected from sulfates, carbonates and fluorides. Since these substances have a buffer function, they are prevented from generating wrinkles in the glass ribbon 12 by being interposed between the glass ribbon 12 and the transport roll 21. Since these substances constituting the buffer layer 23 are stable even when in contact with the glass ribbon 12 in a high temperature state, the buffer layer 23 more preferably contains a sulfate and / or carbonate.
  • the buffer layer 23 may contain an organic salt as a subcomponent.
  • the solvent mixed with the inorganic salt is not particularly limited as long as it is vaporized after adhering to the transport roll 21.
  • examples of such a solvent include water and organic solvents.
  • the buffer layer 23 formed on the transport roll 21 preferably contains a water-soluble substance.
  • the buffer layer 23 formed at a predetermined location of the transport roll 21 may be partly peeled off when coming into contact with the glass ribbon 12 and adhere to the glass surface. For this reason, it is necessary to remove the material of the buffer layer 23 attached to the glass surface at least before shipping the glass. In such a case, it is preferable that the buffer layer 23 contains a water-soluble substance because the substance of the buffer layer 23 attached to the glass surface can be removed only by washing the glass surface with water.
  • the buffer layer 23 contains a water-soluble substance, it is more preferable that the water-soluble substance is contained in at least a portion in contact with the glass ribbon 12, that is, the surface portion of the buffer layer 23. More preferably, the main component of the surface portion is a water-soluble substance.
  • the buffer layer 23 preferably contains sodium sulfate. This is because sodium sulfate has a buffering function, so that the buffer layer 23 containing sodium sulfate is interposed between the glass ribbon 12 and the transport roll 21 to reliably prevent wrinkles from occurring on the glass ribbon 12. It is because it becomes possible to do. Further, since sodium sulfate has a high Vickers hardness, the particles are difficult to peel off and the life of the buffer layer 23 is extended. Sodium sulfate is particularly suitable for the buffer layer 23 because it hardly reacts with glass, has a lower Mohs hardness than glass, and exhibits water solubility.
  • sodium sulfate is preferably contained in the buffer layer 23 as described above, it is more preferably a main component of at least the surface portion of the buffer layer 23, and further preferably a main component of the buffer layer 23. .
  • main component means that 70% by mass or more is contained.
  • the buffer layer 23 is preferably an inorganic salt containing at least one of sodium carbonate, potassium carbonate, sodium tetraborate, potassium tetraborate, sodium silicate, potassium sulfate, and aluminum sulfate. . Since this inorganic salt has a buffering function, the buffer layer 23 containing the inorganic salt is interposed between the glass ribbon 12 and the transport roll 21 to reliably prevent wrinkles on the glass ribbon 12. This is because it becomes possible. Moreover, since the Vickers hardness of the buffer layer 23 can be further increased by containing an inorganic salt, the buffer layer 23 has a long life because it is difficult for the particles to peel off.
  • the lift-out roll 13, which is a severer condition for the buffer layer 23 than the transport rolls R1 to R10 because of the high surface pressure received from the glass ribbon 12 at a high temperature, can be suitably used with a long service life.
  • the inorganic salt is particularly suitable for the buffer layer 23 because it hardly reacts with glass, has a low Mohs hardness, and exhibits water solubility.
  • the buffer layer 23 contains sodium tetraborate
  • the content of sodium tetraborate in the buffer layer 23 is at least 10 vol% or more, preferably at least 20 vol% or more, more preferably 30 vol% or more, and even more preferably 50 vol%.
  • sodium tetraborate is more preferably the main component of at least the surface portion of the buffer layer 23, and more preferably the main component of the buffer layer 23.
  • the buffer layer 23 contains potassium sulfate
  • the content of potassium sulfate in the buffer layer 23 is at least 5 vol% or more, preferably at least 10 vol% or more, more preferably 20 vol% or more, and even more preferably 50 vol% or more.
  • potassium sulfate is more preferably the main component of at least the surface portion of the buffer layer 23, and more preferably the main component of the buffer layer 23.
  • a conveyance process further detects a wrinkle about the glass after slow cooling, and the wrinkle generation
  • production location and the conveyance roll 21 It is preferable to include a target roll specifying step for specifying the target roll that has caused wrinkles. And a buffer layer formation process forms the buffer layer 23 in the buffer layer formation area
  • the wrinkle generation location detecting step is a step of detecting wrinkles on the glass after being slowly cooled.
  • the method for detecting wrinkles is not particularly limited as long as it is a method capable of detecting wrinkles that are larger than the size allowed in the glass to be manufactured.
  • a method for detecting wrinkles for example, light is applied to the glass surface, and at that time, an optical change (for example, reflection of shadows or light) caused by the wrinkle portion is photographed with an optical element such as a line sensor, Examples include a method for detecting the size and position of the eyelid based on the obtained image.
  • the wrinkle generation detection step may be performed on the glass after the slow cooling, and may be performed on the glass in any state, that is, the state of the glass ribbon 12 and the state of being cut into a glass plate. That is, the glass after slow cooling is not limited to the state of the glass ribbon 12. However, there is a possibility that wrinkles may occur during the cutting process, and since the yield can be further improved if the occurrence of wrinkles can be detected earlier, the state of the glass ribbon 12 (that is, the state before cutting). It is preferable to perform a wrinkle occurrence location detecting step.
  • the position information indicating the position in the width direction of the glass is recorded, and the position information is used in the buffer layer forming process.
  • the target roll specifying step is a step of specifying the target roll that has caused the occurrence of wrinkles in the transport roll 21.
  • the glass (or glass ribbon) is transported on the plurality of transport rolls 21 after the molding step, and passes through the target roll having a concavo-convex portion due to wrinkles or deposits on the surface, thereby generating the above-described wrinkle occurrence location. It is considered that wrinkles detected in the detection process are given. Therefore, in the preferable glass manufacturing method of the present embodiment, the buffer layer 23 is formed on the uneven portion of the target roll by the above-described buffer layer forming step. For this reason, in the target roll specifying step, a target roll having an uneven portion is specified (or detected).
  • the procedure of the target roll specifying step is not particularly limited as long as it is a method capable of specifying the target roll having the concavo-convex portion that causes the occurrence of wrinkles as described above.
  • FIG. 1 an example of a method for identifying a target roll having an uneven portion that causes wrinkles will be described.
  • the transport rolls R1 to R10 are configured to be displaceable in the height direction (the direction indicated by arrow a in FIG. 1), and the transport roll R1 that contacts the glass ribbon 12 is used.
  • the odd-numbered transport rolls R1, R3,. . . The target roll which has an uneven
  • odd-numbered transport rolls R1, R3,. . . For example, if only a few selected transport rolls are not in contact with the glass ribbon 12, the glass is inspected for wrinkles, and if there are no wrinkles, the transport rolls that are not in contact are uneven. It can be seen that target rolls having portions are included. If wrinkles occur, odd-numbered transport rolls R1, R3,. . . It turns out that the object roll which has an uneven
  • production location detection process may be sufficient as the method of detecting whether the wrinkle has generate
  • the target roll specifying process for the transporting rolls R1 to R10 has been described.
  • the lift-out roll 13 can also be a target of the target roll specifying process.
  • a target roll having a concavo-convex portion can be identified by the same method or procedure as described above.
  • the buffer layer forming step forms a buffer layer in the buffer layer forming region including the wrinkle occurrence location detected by the wrinkle occurrence location detection step among the target rolls specified in the target roll specifying step.
  • FIG. 3 Another example of the conveying process and the buffer layer forming process will be described with reference to FIG.
  • the left portion is a view of the state in which the glass (glass ribbon) 12 is being conveyed by a plurality of conveying rolls R31 to R34 as viewed from the upper surface side.
  • the right part in FIG. 3 is the figure which looked at the state which the wrinkle 31 generate
  • the wrinkle occurrence location detecting step when the wrinkle 31 is detected, the wrinkle is detected on the surface of any one of the transport rolls R31 to R34 and between the dotted line A and the dotted line B corresponding to the position of the wrinkle 31. It can be seen that there are uneven portions (that is, wrinkles, deposits, etc.) that caused the occurrence of 31.
  • the target roll specifying step when it is specified that the target roll having the concavo-convex portion causing the ridge 31 is, for example, the transport roll R32, the portion surrounded by the dotted lines A and B of the transport roll R32 321 has an uneven portion. That is, this part 321 corresponds to the wrinkle occurrence location detected by the wrinkle occurrence location detection step of the transport roll R32 specified as the target roll in the target roll specification step.
  • the buffer layer is formed in the region including the portion 321 by the above-described method so as not to generate wrinkles on the glass in contact.
  • the shape of the buffer layer is not particularly limited, and may be formed so as to cover the uneven portion causing the generation of the ridge 31 in a shape that does not generate the detected ridge 31.
  • the range for forming the buffer layer may be a buffer layer forming region including the portion 321 corresponding to the wrinkle occurrence location detected by the wrinkle occurrence location detection step of the target roll specified in the target roll specifying step as described above. There is no particular limitation.
  • the portion 321 corresponding to the wrinkle occurrence location is provided in a band shape over the peripheral surface of the target roll (according to the width of the wrinkle 31).
  • the number of strip-shaped buffer layers may be single or plural.
  • the buffer layer has a certain width, it is more difficult to peel off, and considering the detection accuracy of the wrinkle occurrence location detection step, at least the wrinkle occurrence location detected by the wrinkle occurrence location detection step It is more preferable to form the buffer layer over a wider range (or width) than the corresponding portion 321.
  • the buffer layer forming region for forming the buffer layer is more preferably in the range of ⁇ 50 mm or more in the axial direction of the target roll of the portion 321 corresponding to the wrinkle occurrence location.
  • the range of the buffer layer forming region as described above will be described with reference to FIG.
  • the range corresponding to the wrinkle occurrence location of the target roll in FIG. 3 is the range of ⁇ 50 mm or more in the axial direction of the target roll of the portion 321 corresponding to the wrinkle occurrence location of the predetermined target roll specified by the target roll specifying step. It means that the lengths of W1 and W2 indicating the distance in the width direction of the target roll from both ends of 321 are 50 mm or more. Therefore, in the case of FIG. 3, it is preferable that the buffer layer is formed over at least the range of the width 322.
  • the buffer layer is formed over the width 322 wider than the width of the flange 31 as described above, it is more preferable that the buffer layer is formed on the entire peripheral surface of the transport roll with the width as described above.
  • a buffer layer may be formed on the transport roll in advance.
  • the range in which the buffer layer is formed is not particularly limited.
  • the width of the buffer layer is that of the transport roll. It is preferably 85% or more of the width in contact with the glass.
  • the upper limit value of the width of the buffer layer is not particularly limited, for example, the width of the buffer layer is preferably 100% or less of the width in contact with the glass of the transport roll.
  • the supply nozzle 22 shown in FIG. 2 is moved around the uneven portion, and the buffer layer raw material is sprayed.
  • a uniform buffer layer 23 can be formed on the transport roll 21.
  • Such spraying of the buffer material is preferable because it can be performed without interrupting the production of glass.
  • the transport process of glass manufacturing method of this embodiment only spraying the SO 2 gas to the surface of the glass ribbon facing the transporting roll, can have a protective layer forming step of forming a flaw preventing protection layer on a glass ribbon surface Is preferred.
  • the target roll is removed from the transport roll disposed within 3 m downstream from the exit of the glass forming means. It is preferable to specify. Furthermore, it is preferable to specify the target roll from the transport rolls arranged in the range from the exit of the dross box to 1.5 m downstream.
  • a method for preventing and / or suppressing the generation of wrinkles on the surface of the glass ribbon when the glass ribbon is transported by the transport roll the glass ribbon is brought into contact with SO 2 gas (sulfurous acid gas or sulfur dioxide) and the glass ribbon.
  • SO 2 gas sulfurous acid gas or sulfur dioxide
  • a method of forming a protective layer for preventing wrinkles on the surface is known. In this method, when performing slow cooling, a protective layer for preventing wrinkles is formed on the surface of the glass ribbon by spraying SO 2 gas on the surface of the glass ribbon facing the transport roll, preferably immediately after the forming step.
  • the method for forming the protective layer for preventing wrinkles on the surface of the glass ribbon with SO 2 gas can be used in combination in the glass manufacturing method of the present embodiment.
  • the range in which the SO 2 gas is sprayed onto the glass ribbon surface is not particularly limited, but it is preferable to spray the SO 2 gas in a region where the temperature of the glass being conveyed is 500 ° C. or higher. This is because the protective layer for preventing wrinkles is easily formed by spraying SO 2 gas in the range where the temperature of the glass is 500 ° C. or higher. For this reason, for example, immediately after taking out the glass ribbon from the exit of the glass forming means, that is, in the case of FIG. 1, immediately after the exit of the float bath 10 indicated by Y or immediately after the dross box 14 indicated by X (or the exit) and in the vicinity thereof. It is preferable to spray SO 2 gas on the glass (or glass ribbon 12). For example, it is preferable to spray SO 2 gas in a region within 1.0 m immediately after the dross box. Moreover, it is more preferable to spray SO 2 gas in a region within 0.7 m immediately after the dross box.
  • a buffer layer in which the protective layer for preventing wrinkles on the surface of the glass ribbon is transferred to the transport roll can be formed. . For this reason, since a buffer layer is formed on the surface of the transport roll over a wide range on the downstream side, the occurrence of wrinkles in the glass can be further suppressed.
  • the buffer layer to which the wrinkle-preventing protective layer is transferred on the upstream transport roll.
  • scratch preventing protection layer by reaction with SO 2 gas and the glass ribbon from the exit of the glass shaped means is formed, the buffer layer This flaw preventing protection layer has been transferred It is preferable to specify the target roll from the transport roll arranged in the range up to the transport roll on which is formed.
  • the SO 2 gas and the portion usually 3 m away from the exit of the glass forming means, particularly 1.5 m away from the exit of the dross box A protective layer for preventing wrinkles is formed by reaction with the glass ribbon surface.
  • the distance from the exit of the glass forming means means the distance from the exit of the float bath when the glass forming means is a float method, for example.
  • the transport rolls to be targeted in the target roll identification process (that is, the target of inspection) can be narrowed down, it becomes possible to identify the target roll having an uneven portion on the surface at an earlier stage. It is preferable because productivity and yield can be improved.
  • the processing of the flowchart shown in FIG. 4 is started at a predetermined timing.
  • the timing at which the processing is started is not particularly limited, and can be specified in advance so as to be performed every predetermined time or every time the glass production amount reaches the predetermined production amount. Further, when the inspection of the glass (or glass ribbon) of the product is continuously performed, it can be considered that the process of FIG. 4 is always performed.
  • step S41 the wrinkle occurrence location detection step shown in step S41 is performed as described above. If no wrinkle is detected within a predetermined detection time in this wrinkle occurrence location detection step (that is, “no wrinkle detection”), the processing in FIG. 4 ends. On the other hand, when a wrinkle is detected in the wrinkle occurrence location detection process (that is, “wrinkle detection”), the process proceeds to step S42, and a target roll specifying process is performed. After specifying the target roll having the concavo-convex portion due to wrinkles or the like in the target roll specifying step, the process proceeds to step S43.
  • step S43 a buffer layer is formed for the wrinkle occurrence location detected in step S41 and the corresponding location of the target roll identified in step S42.
  • step S43 the process of FIG.
  • the solution containing the inorganic salt is directly sprayed on the transport roll, and the solution adhering to the transport roll is dried to form a buffer layer of the inorganic salt. Generation of wrinkles on the surface can be suppressed.
  • the glass manufacturing apparatus of the present embodiment may have the following configuration, for example.
  • the glass manufacturing apparatus may include a float bath for forming a glass ribbon on a molten metal, and a dross box provided with a lift-out roll adjacent to the float bath for pulling up the glass ribbon.
  • the glass manufacturing apparatus includes a transport roll adjacent to the dross box and having a buffer layer formed by drying a solution containing an inorganic salt, and gradually cooled to below the strain point temperature of the glass while transporting the glass ribbon by the transport roll.
  • a slow cooling furnace may be provided.
  • the glass manufacturing apparatus may have, for example, the configuration shown in FIG.
  • the glass manufacturing apparatus includes a float bath 10 that forms a glass ribbon 12 on a molten metal 11 as described above.
  • a dross box 14 having a lift-out roll 13 that lifts the glass ribbon 12 adjacent to the float bath 10 is disposed.
  • a slow cooling furnace 15 is disposed adjacent to the dross box 14, and the slow cooling furnace 15 gradually cools the glass ribbon 12 to a temperature equal to or lower than the strain point temperature of the glass while being transported by the transport rolls R1 to R10.
  • the transport roll arbitrarily selected from the transport rolls R1 to R10 disposed in the slow cooling furnace 15 may have a buffer layer (not shown) formed by drying a solution containing an inorganic salt.
  • a buffer layer may also be formed on the lift-out roll 13 in the dross box 14, for example, other than the transport rolls R1 to R10 in the slow cooling furnace 15. Further, the buffer layer may be formed on the arbitrarily selected lift-out roll 13 without forming the buffer layer on the transport rolls R1 to R10.
  • the buffer layer can be formed, for example, by spraying a solution or dispersion containing an inorganic salt from the supply nozzle onto the surface of the transport roll and drying.
  • the glass manufacturing apparatus of this embodiment is provided with the supply nozzle which sprays the solution containing inorganic salt on a conveyance roll.
  • the configuration of the supply nozzle, the specific formation method and shape of the buffer layer, and the like may be the same as, for example, the case of the glass manufacturing method described above, and thus description thereof is omitted here.
  • the glass (or glass ribbon) is conveyed on a plurality of conveyance rolls after the molding step and passes through a conveyance roll having irregularities due to defects and deposits on the surface, so that wrinkles are imparted.
  • a wrinkle detection means for detecting wrinkles may be provided for the glass after slow cooling.
  • the wrinkle detection means is not particularly limited as long as it is a means capable of detecting wrinkles that are larger than the size allowed in the glass to be manufactured.
  • the wrinkle detection means for example, light is applied to the glass surface, and at that time, an optical change (for example, reflection of shadows or light) caused by the wrinkle portion is photographed and obtained by an optical element such as a line sensor. Examples include means for detecting the size and position of the eyelid based on the obtained image.
  • the position in which a wrinkle detection means is installed is not specifically limited, When providing the glass cutting means mentioned later, it is preferable to provide a wrinkle detection means upstream from a glass cutting means.
  • a buffer layer can be formed on the part of the transport roll that caused the wrinkle detected by the wrinkle detection means, corresponding to the wrinkle occurrence location.
  • a glass manufacturing method Since it has already been described in FIG.
  • the wrinkle detection means may be configured to be able to displace, for example, the lift-out roll 13 and the transport rolls R1 to R10 in the height direction in order to detect the wrinkle occurrence position of the transport roll.
  • the glass manufacturing apparatus of the present embodiment is not limited to the above configuration, and any various means can be provided. Specifically, for example, a raw material melting means for producing a molten glass by melting a glass raw material is arranged on the upstream side of the float bath 10 in FIG. 1, and a defoaming processing means for removing gas in the molten glass. Etc. can also be arranged.
  • FIG. 14 it may be installed SO 2 blowing means for blowing the SO 2 gas to the surface of the glass ribbon facing the transport roll.
  • the above-mentioned glass manufacturing method can be implemented suitably.
  • the structure demonstrated in the glass manufacturing method can also be employ
  • the glass manufacturing apparatus of the float process was demonstrated to the example, glass manufacturing The apparatus is not limited to a float glass manufacturing apparatus.
  • a glass ribbon transport unit that transports a glass ribbon by a transport roll is provided after a forming unit, and a solution containing an inorganic salt is formed on at least a part of the transport roll by drying.
  • the buffer layer may be provided.
  • the buffer layer formed by drying the solution containing an inorganic salt is formed in the conveyance roll, it suppresses that a wrinkle generate
  • the shape of the roll base material is a disk shape having an outer diameter of 150 mm ⁇ thickness of 20 mm for convenience in use for the test described later, the radial cross section of the outer peripheral surface of the roll is an outwardly convex curved surface, and the curvature radius of the curved surface is 50 mm.
  • the outer peripheral surface of the roll was polished by hand polishing using water-resistant paper.
  • the surface roughness (Ra) of the outer peripheral surface of the roll after polishing was 0.5 ⁇ m.
  • Example 2 In Experimental Example 2, as in Experimental Example 1, a roll base material formed of stainless steel containing about 25% by mass of Cr and about 20% by mass of Ni was used, and the outer peripheral surface of the roll was polished by hand polishing. The surface roughness (Ra) of the outer peripheral surface of the roll after polishing was 0.5 ⁇ m.
  • the roll as described above was heated to 300 ° C., and a 10 mass% sodium sulfate aqueous solution dissolved with distilled water was sprayed at 20 cc / min on the outer peripheral surface of the roll. Since the sprayed aqueous solution had a roll temperature of 100 ° C. or higher, the water evaporated and only sodium sulfate remained on the outer peripheral surface of the roll to form a film.
  • the sodium sulfate film formed on the outer peripheral surface of the roll was measured with a high-frequency electromagnetic film thickness meter (manufactured by Kett Scientific Laboratory), the thickness of the sodium sulfate film was 100 ⁇ m.
  • FIG. 5 is a schematic diagram for explaining the test apparatus used for this evaluation.
  • This test apparatus is configured by combining a roll-on-disk type rolling friction tester 510 (manufactured by Takachiho Seiki Co., Ltd.) and an electric furnace (not shown).
  • the roll-on-disk type rolling friction tester 510 is configured so that the peripheral surface of a glass transport roll (hereinafter also simply referred to as “roll”) 530 contacts the upper surface of a disk-shaped glass plate 520 that rotates in the circumferential direction. Is provided.
  • the roll 530 is rotatable in the circumferential direction, the rotation axis direction is the same as the radial direction of the glass plate 520, and is provided so as to be able to advance and retreat in the rotation axis direction.
  • the upper surface of the glass plate 520 and the peripheral surface of the roll 530 are brought into contact with each other, and a constant load is applied to the roll 530 in the direction from the center of the roll 530 toward the glass plate 520.
  • the roll 530 rotates so as to roll on the glass plate 520 with the rotation.
  • the roll 530 rolls while drawing a spiral friction mark on the upper surface of the glass plate 520.
  • the test conditions were as follows: the atmospheric temperature was 600 ° C., the load on the roll 530 was 500 gf, the radius of the glass plate 520 was 90 mm, the rotation speed of the glass plate 520 was 0.5 rps, and the width of the friction mark (that is, the glass plate 520 and the roll 530 The distance between the friction marks in the radial direction of the glass plate 520 (that is, the distance between the centers in the width direction of the friction marks) was 0.125 mm.
  • the glass plate 520 and the roll 530 of each experimental example were set in the testing machine 510.
  • the temperature in the electric furnace was raised to 600 ° C. so that the glass plate 520 and the roll 530 were not in contact with each other.
  • the glass plate 520 is rotated in the direction of the block arrow A in FIG. 5 and the roll 530 is advanced in the axial direction indicated by the block arrow B in FIG. That is, axis feed) was started simultaneously.
  • the axial feed speed of the roll 530 was set so that the distance between the friction marks was a predetermined value.
  • the temperature in the electric furnace was gradually lowered so as not to break the glass plate 520 and lowered to room temperature, and then the glass plate 520 was taken out.
  • Experimental Example 2 it was confirmed that the sodium sulfate film remained on the outer peripheral surface of the roll 530 when the glass plate 520 was taken out.
  • FIG. 6 (a) shows a photograph of the outer peripheral glass plate surface of Experimental Example 1
  • FIG. 6 (b) shows a photograph of the inner peripheral glass plate surface of Experimental Example 1, respectively.
  • FIG. 7A shows a photograph of the glass plate surface on the outer peripheral side of Experimental Example 2
  • FIG. 7B shows a photo of the glass plate surface on the inner peripheral side of Experimental Example 2.
  • the degree of wrinkles generated on the upper surface of the glass plate 520 thus obtained was evaluated by the following method.
  • Observation points were determined at positions of 20 mm and 80 mm on the upper surface of the obtained glass plate 520 along the radial direction from the edge toward the center. Then, an observation area having a size of 2.12 mm ⁇ 1.59 mm square with the observation point at the center is photographed, and based on the area of wrinkles present in the photographed image of each observation area and the total area of the photographed image
  • the wrinkles in each observation region were calculated by the following formula (1).
  • Rate of wrinkle occurrence (%) ⁇ (total area of wrinkles) / (total area of photographed image) ⁇ ⁇ 100 (1)
  • Table 1 shows the results of measuring the rate of occurrence of wrinkles on the glass plates in Experimental Examples 1 and 2 thus obtained.
  • the observation area centered on the observation point 20 mm from the edge is defined as the “outer periphery”, and the wrinkle occurrence rate in this observation area is shown.
  • region centering on the observation point of 80 mm from an edge is made into the "inner periphery”, and the wrinkle incidence rate in this observation area
  • FIG. 8 is a schematic view showing a test apparatus for evaluating the particle transfer rate to glass.
  • a 20 mm square glass plate 802 is held by a metal jig 801, and a SUS310 substrate 804 coated with a buffer layer 803 is disposed under the jig 801.
  • the buffer layer 803 was sprayed in the same manner as in Experimental Example 2. However, the breakdown of the solute of 10% by mass dissolved in distilled water (that is, the composition of the buffer layer) is changed, and the composition of the buffer layer 803 is sodium sulfate 100 vol% (A), sodium sulfate 80 vol%, and sodium tetraborate 20 vol.
  • each buffer layer 803 was 100 ⁇ m, and each Vickers hardness was measured using a Vickers hardness tester.
  • the jig 801 was moved up and down from the state of FIG. 8 to bring the glass plate 802 into contact with the substrate 804 by its own weight. After bringing the glass plate 802 and the substrate 804 into contact 100 times, the area of the transferred particles on the glass plate 802 was observed with an optical microscope and quantified.
  • FIG. 9 is a graph showing the relationship between the particle transfer rate (%) and the Vickers hardness (Hv) of the buffer layer.
  • the types of the composition of the buffer layer 803 are A, D, E, B, F, and C described above in descending order of Vickers hardness. From FIG. 9, it was confirmed that with addition of sodium tetraborate or potassium sulfate, the Vickers hardness increased and the particle transfer rate also decreased. From the above, the buffer layer has a longer life than the conventional carbon film by using an inorganic salt buffer layer having a Vickers hardness of 30 or more. However, sodium tetraborate or potassium sulfate is further added. Thus, by increasing the Vickers hardness of the buffer layer, it is possible to suppress the separation of the particles constituting the buffer layer, and thus it was confirmed that the life of the buffer layer was further extended.
  • FIG. 10 is a schematic view of a test apparatus for evaluating the life of the buffer layer.
  • a plurality of rolls 1003 are arranged in an electric furnace 1001, and a central roll among the plurality of rolls 1003 has a buffer layer 1002.
  • the composition of the buffer layer 1002 was prepared as follows: sodium sulfate 100 vol% (A), sodium tetraborate 100 vol% (G), and potassium sulfate 100 vol% (H).
  • the buffer layer 1002 was formed on the outer peripheral surface of the roll 1003 by the same method as in Experimental Example 2 regardless of the composition.
  • the thickness of the buffer layer 1002 was 100 ⁇ m.
  • a roll having a diameter of 60 mm was used as the roll 1003, and the two adjacent rolls 1003 were arranged so that the distance between the centers of the two rolls 1003 was about 100 mm.
  • the following life evaluation tests were performed using the roll 1003 as described above.
  • a glass plate 1004 having a thickness of 3 mm and a size of 300 mm square was placed in the electric furnace 1001, and the inside of the electric furnace 1001 was heated to 600 ° C.
  • the glass plate 1004 was slid back and forth 500 times with a stroke of 200 mm, and brought into contact with the central roll 1003 on which the buffer layer 1002 was formed.
  • the glass plate 1004 was taken out, the remaining state of the buffer layer 1002 of the center roll 1003 was confirmed, and the life was determined when the metal of the center roll 1003 was exposed. Moreover, the same experiment was done also about the glass plate of bill difference 4mm and 5mm. The determination result of the lifetime of the buffer layer 1002 is shown in Table 2 below.
  • the number of reciprocations means the number of times the glass plate 1004 is slid back and forth with a stroke of 200 mm.
  • the life of the buffer layer 1002 is about 6 to 7 times longer when the composition of the buffer layer 1002 is 100 vol% (A) of sodium sulfate and 100 vol% (G) of sodium tetraborate. It was confirmed that Moreover, in the case of 100 vol% (H) of potassium sulfate, it was confirmed that the life of the buffer layer 1002 was almost the same as that of 100 vol% (G) of sodium tetraborate. Therefore, it was confirmed that the life of the buffer layer 1002 was further increased by increasing the Vickers hardness of the buffer layer 1002.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Rollers For Roller Conveyors For Transfer (AREA)

Abstract

L'invention concerne un procédé de fabrication de verre, comprenant une étape de formation, consistant à former un ruban de verre à partir de verre en fusion à l'aide d'un moyen de formation de verre, et une étape de transport, consistant à transporter le ruban de verre à l'aide de rouleaux de transport tout en refroidissant graduellement le ruban de verre à ou au-dessous de la température de déformation du verre. L'étape de transport comprend une étape de formation d'une couche tampon consistant à pulvériser directement une solution d'un sel inorganique sur la surface des rouleaux de transport et à sécher la solution déposée sur les rouleaux de transport pour former une couche tampon de sel inorganique présentant une dureté Vickers de 30 ou plus.
PCT/JP2015/063231 2014-05-12 2015-05-07 Rouleau de transport pour transporter du verre, procédé de fabrication de verre l'utilisant et dispositif de fabrication de verre. WO2015174324A1 (fr)

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WO2022224912A1 (fr) * 2021-04-20 2022-10-27 Ａｇｃ株式会社 Procédé de fabrication de verre feuilleté pour fenêtre d'automobile
WO2022224909A1 (fr) * 2021-04-20 2022-10-27 Ａｇｃ株式会社 Verre feuilleté pour véhicule et automobile
WO2022224914A1 (fr) * 2021-04-20 2022-10-27 Ａｇｃ株式会社 Procédé de production de verre feuilleté pour vitres d'automobile, verre feuilleté pour vitres d'automobile, et automobile

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KR102166471B1 (ko) * 2017-09-20 2020-10-16 주식회사 엘지화학 유리 기판의 제조 방법 및 제조 장치

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JPH0545034U (ja) * 1991-11-13 1993-06-18 セントラル硝子株式会社 ガラス搬送ローラー
JPH0948628A (ja) * 1995-08-07 1997-02-18 Nichias Corp ディスクロール及びその処理方法
WO2002051767A1 (fr) * 2000-12-26 2002-07-04 Nippon Sheet Glass Co.,Ltd. Verre a glace avec film protecteur et son procede de fabrication
WO2013061793A1 (fr) * 2011-10-28 2013-05-02 旭硝子株式会社 Procédé pour nettoyer un rouleau arrière et dispositif de production de plaque de verre
WO2014077371A1 (fr) * 2012-11-16 2014-05-22 旭硝子株式会社 Procédé de production de verre et appareil de production de verre

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JPH0545034U (ja) * 1991-11-13 1993-06-18 セントラル硝子株式会社 ガラス搬送ローラー
JPH0948628A (ja) * 1995-08-07 1997-02-18 Nichias Corp ディスクロール及びその処理方法
WO2002051767A1 (fr) * 2000-12-26 2002-07-04 Nippon Sheet Glass Co.,Ltd. Verre a glace avec film protecteur et son procede de fabrication
WO2013061793A1 (fr) * 2011-10-28 2013-05-02 旭硝子株式会社 Procédé pour nettoyer un rouleau arrière et dispositif de production de plaque de verre
WO2014077371A1 (fr) * 2012-11-16 2014-05-22 旭硝子株式会社 Procédé de production de verre et appareil de production de verre

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022224912A1 (fr) * 2021-04-20 2022-10-27 Ａｇｃ株式会社 Procédé de fabrication de verre feuilleté pour fenêtre d'automobile
WO2022224909A1 (fr) * 2021-04-20 2022-10-27 Ａｇｃ株式会社 Verre feuilleté pour véhicule et automobile
WO2022224914A1 (fr) * 2021-04-20 2022-10-27 Ａｇｃ株式会社 Procédé de production de verre feuilleté pour vitres d'automobile, verre feuilleté pour vitres d'automobile, et automobile

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