WO2018110233A1 - ガラス物品の製造方法 - Google Patents

ガラス物品の製造方法 Download PDF

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Publication number
WO2018110233A1
WO2018110233A1 PCT/JP2017/041984 JP2017041984W WO2018110233A1 WO 2018110233 A1 WO2018110233 A1 WO 2018110233A1 JP 2017041984 W JP2017041984 W JP 2017041984W WO 2018110233 A1 WO2018110233 A1 WO 2018110233A1
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WO
WIPO (PCT)
Prior art keywords
roller
glass
internal cooling
glass ribbon
shaft portion
Prior art date
Application number
PCT/JP2017/041984
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
克利 藤原
Original Assignee
日本電気硝子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本電気硝子株式会社 filed Critical 日本電気硝子株式会社
Priority to KR1020197008665A priority Critical patent/KR102274709B1/ko
Priority to CN201780076299.0A priority patent/CN110072819B/zh
Publication of WO2018110233A1 publication Critical patent/WO2018110233A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/067—Forming glass sheets combined with thermal conditioning of the sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • 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
    • C03B35/162—Transporting hot glass sheets or ribbons, e.g. by heat-resistant conveyor belts or bands by roller conveyors combined with means for thermal adjustment of the rollers, e.g. cooling
    • 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
    • C03B35/183—Construction of the conveyor rollers ; Materials, coatings or coverings thereof specially adapted for thermal adjustment of the rollers, e.g. insulating, heating, cooling thereof
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2225/00—Transporting hot glass sheets during their manufacture

Definitions

  • the present invention relates to a method for manufacturing a glass article.
  • the downdraw method includes, for example, an overflow downdraw method, a slot downdraw method, a redrawdown draw method, and the like.
  • the above glass article manufacturing method may include a preparatory step for preparing a glass ribbon before the production step.
  • this preparation step the glass that has flowed down from the formed body is sequentially sandwiched by an annealing roller. Thereby, the glass flowed down from the compact is stretched thinly, and gradually approaches the shape of the glass ribbon.
  • the annealing roller may be internally cooled in order to prevent problems such as bending of the annealing roller due to thermal deformation or winding of glass around the annealing roller.
  • the annealing roller is excessively cooled, for example, in the production process, the glass ribbon is rapidly cooled, and a new problem that the glass ribbon easily breaks may occur. Therefore, there is still a problem in the internal cooling of the annealing roller in each step of the preparation process and the production process.
  • An object of the present invention is to optimize the internal cooling of the annealing roller in each step of the preparation process and the production process.
  • the present invention devised to solve the above problems is a method of manufacturing a glass article using the downdraw method, and is downward in a state where a glass ribbon formed by a molded body is sandwiched between upper and lower annealing rollers. And a preparation step of holding the glass that has flowed down from the molded body in order with an annealing roller and bringing it closer to the shape of the glass ribbon before the production step, and the annealing roller in the production step A first roller disposed in a first temperature region that exceeds the strain point of the glass ribbon, and a second roller disposed in a second temperature region that is less than or equal to the strain point of the glass ribbon in the production process. Is characterized in that the internal cooling temperature in the production process is higher than the internal cooling temperature in the preparation process.
  • the inventors of the present application focused on the difference between the amount of heat of glass (glass ribbon) in the production process and the amount of heat of glass in the preparation process. That is, in the preparatory process, since the glass is in a state before the glass ribbon, the thickness is large. Therefore, the amount of heat that the glass has inevitably increases. On the other hand, in the production process, since the thickness of the glass ribbon is small, the amount of heat that the glass ribbon has is inevitably small. For this reason, in the production process, when the annealing roller is cooled under the same temperature condition as in the preparation process, it is considered that the glass ribbon is rapidly cooled and the glass ribbon breaks.
  • the internal cooling temperature of the second roller (annealer roller disposed in the second temperature region) in the production process is higher than the internal cooling temperature of the second roller in the preparation process.
  • the internal cooling temperature of the first roller is lower than the internal cooling temperature of the second roller in the production process. Even in the production process, since the glass temperature and the ambient temperature are high in the first temperature region above the strain point, the first roller disposed in the region may be thermally deformed and the glass may be wound. Therefore, in order to prevent thermal deformation of the first roller and winding of the glass in the production process, it is preferable to employ the above configuration.
  • the first roller includes a first shaft portion having a passage through which a cooling fluid can flow, and a first roller body provided in the first shaft portion.
  • the internal cooling temperature of the second roller may be adjusted by changing the supply flow rate of the cooling fluid to the second shaft portion in the preparation process and the production process.
  • a method of adjusting the internal cooling temperature a method of changing the supply temperature of the cooling fluid itself can be considered, but the method of changing the supply flow rate itself can be realized with a simpler mechanism.
  • the supply of the cooling fluid to the second shaft portion may be stopped in the production process.
  • the second shaft portion is made of a metal that is supported at both ends, the second roller body is provided on each side of the second shaft portion in the axial direction, and the second shaft portion is the second shaft portion. You may have a metal exposure part between the 2nd rollers in an axial direction.
  • the second shaft portion may be made of a metal that is cantilevered, and the second roller body may be provided on one axial side of the second shaft portion.
  • the preparation step includes an adjustment step for adjusting the thickness of the glass and the direction of warpage, and after the adjustment step, the internal cooling temperature of the second roller is changed from the internal cooling temperature in the preparation step to the production step. It is preferable to switch to the internal cooling temperature.
  • the internal cooling temperature of the second roller is determined from the internal cooling temperature in the production process. You may switch to the internal cooling temperature in a preparation process. In this way, when the production failure of the glass ribbon occurs in the production process, the internal cooling temperature of the second roller can be automatically switched to the internal cooling temperature in the preparation process.
  • the glass ribbon after the slow cooling in the production process may be wound into a roll. If it does in this way, a roll-shaped glass article (glass roll) can be manufactured.
  • FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is sectional drawing of the 1st roller shown in FIG. 1, and a 1st axial part. It is sectional drawing of the 2nd roller and 2nd axial part which are shown in FIG.
  • FIG. 6 is a sectional view taken along line BB in FIG. 5. It is a front view of the modification of the manufacturing apparatus of a glass article.
  • a glass article manufacturing apparatus 1 used in a glass article manufacturing method mainly includes a forming furnace 2 and a slow cooling furnace 3 positioned below the forming furnace 2.
  • the glass article manufacturing apparatus 1 forms a molten glass GM supplied from a melting furnace provided on the upstream side into a glass ribbon GR by a forming furnace 2, and then removes the warp and internal distortion of the glass ribbon GR by a slow cooling furnace 3. (Reduce).
  • illustration of the furnace walls of the forming furnace 2 and the slow cooling furnace 3 is omitted.
  • the molding furnace 2 includes a molded body 4 that executes the overflow downdraw method inside the furnace wall, and edge rollers 5 that cool both ends in the width direction of the glass ribbon GR molded by the molded body 4.
  • the molded body 4 is formed in a long shape and has an overflow groove 6 formed along the longitudinal direction (the width direction of the glass ribbon GR) at the top. Moreover, the molded object 4 is provided with the vertical surface part 7 and the inclined surface part 8 which comprise a pair of side wall part which mutually opposes. An inclined surface portion 8 is formed to be connected to the lower end portion of the vertical surface portion 7. The pair of inclined surface portions 8 intersect each other by gradually approaching downward, and constitute a lower end portion 9 of the molded body 4.
  • the edge roller 5 is configured as a pair of left and right in front view so as to sandwich each end in the width direction of the glass ribbon GR immediately below the molded body 4. Further, as shown in FIG. 2, the edge roller 5 is configured as a pair of rollers arranged in parallel in the thickness direction of the glass ribbon GR so as to sandwich the end portion in the width direction of the glass ribbon GR.
  • the edge roller 5 is a cantilever type roller, and is always internally cooled in each of a preparation process and a production process described later.
  • the edge roller 5 may be provided in a plurality of stages (for example, two stages) in the vertical direction. For example, in the case of two upper and lower stages, it is preferable that the upper edge roller is a driving roller and the lower edge roller is a free roller.
  • the molten glass GM is poured into the overflow groove 6 of the molded body 4, and the molten glass GM overflowing from both sides of the overflow groove 6 is allowed to flow down along the vertical surface portion 7 and the inclined surface portion 8.
  • the molded object 4 may be the structure which performs other down draw methods other than overflow down draw methods, such as not only said structure but a slot down draw method and a redraw down draw method.
  • the slow cooling furnace 3 includes an annealing roller 10 configured as a plurality of stages (six stages in the illustrated example) in the vertical direction.
  • the annealing roller 10 includes a first roller 11 (first annealing roller) 11 disposed in the first temperature region X that is above the strain point of the glass ribbon GR in the production process, and a second that is below the strain point of the glass ribbon GR in the production process. And a second roller (second annealer roller) 12 disposed in the temperature region Y.
  • the first roller 11 includes a first shaft portion 13 that is supported at both ends, and a first roller body 14 that is continuously provided on a portion overlapping the glass ribbon GR of the first shaft portion 13. Is provided.
  • the first shaft portion 13 is made of metal, passes through the shaft center of the first roller body 14, and protrudes from each end portion of the first roller body 14.
  • the first roller body 14 has a large-diameter contact portion 14a that contacts the glass ribbon GR, and a small-diameter non-contact portion 14b that does not contact the glass ribbon GR.
  • the contact part 14a is comprised as a roller pair which clamps the glass ribbon GR in a plate
  • the contact part 14a is comprised so that it may become 1 set of right and left in front view (refer FIG. 1) so that each edge part of the width direction in the glass ribbon GR may be clamped.
  • the non-contact portion 14b functions as a cover portion that covers the first shaft portion 13 that overlaps the glass ribbon GR in a front view.
  • the second roller 12 includes a second shaft portion 15 that is supported at both ends, and a second roller body 16 that is provided on both sides of the second shaft portion 15 in the width direction.
  • the second shaft portion 15 is made of metal, passes through the shaft center of the second roller body 16, and protrudes from each end portion of each second roller body 16.
  • the second roller body 16 functions as a contact portion that contacts the glass ribbon GR. As shown in FIG. 2, the second roller body 16 is configured as a pair of rollers that sandwich the glass ribbon GR in the thickness direction. In addition, the second roller body 16 is configured to form a pair on the left and right in a front view (see FIG. 1) so as to sandwich each end in the width direction of the glass ribbon GR. A portion of the second shaft portion 15 between the pair of left and right second roller bodies 16 is a metal exposed portion 15a where the metal portion of the second shaft portion 15 is exposed. The exposed metal portion 15a overlaps the glass ribbon GR in a front view.
  • Each roller main body 14 and 16 is made of, for example, ceramics, and is configured by impregnating an inorganic filler from the surface to a predetermined depth.
  • an inorganic filler for example, silica, more preferably sintered amorphous is used.
  • the inorganic filler a colloidal suspension of a heat-resistant oxide such as colloidal silica or colloidal alumina is suitable.
  • the material of each roller main body 14 and 16 will not be specifically limited if it has heat resistance.
  • cooling devices 17 and 18 are provided on the shaft portions 13 and 15 of the rollers 11 and 12, respectively.
  • the 1st cooling device 17 has arrange
  • the first cooling pipe 19 has a plurality of holes 20 for discharging a cooling medium such as air.
  • the cooling medium discharged from the plurality of holes 20 circulates inside the first shaft portion 13, thereby internally cooling the first shaft portion 13 and the first roller body 14.
  • internal cooling means cooling the member to be cooled from the inside.
  • the second cooling device 18 has a configuration substantially similar to that of the first cooling device 17.
  • the 2nd cooling device 18 is also provided with the 2nd cooling piping 21 which has the some hole 22 which discharges a cooling medium inside the 2nd axial part 15 comprised hollowly.
  • the cooling pipes 19 and 21 are provided with valves 23 and 24, respectively, so that the flow rate of the cooling medium can be adjusted.
  • the adjustment of the flow rate of the cooling medium includes a case where the supply of the cooling medium is stopped by completely closing the valves 23 and 24.
  • the structure of the cooling devices 17 and 18 will not be specifically limited if a cooling fluid can be distribute
  • symbol 25 is a sensor which detects the torque and / or rotation speed of the edge roller 5
  • symbol 26 is the presence or absence of the glass ribbon GR, and / or the crack ((
  • a sensor for example, a laser sensation
  • detecting the facing distance between the edge roller 5 and the annealing roller 10 is also provided. These sensors may be omitted.
  • This manufacturing method includes a preparation process for forming the glass ribbon GR and a production process for forming the glass ribbon GR.
  • the molten glass GM supplied from the melting furnace is poured into the overflow groove 6 of the molded body 4 and overflows from the overflow groove 6 to the vertical surface portion 7 and the inclined surface portion 8, and the lower end. Join at part 9.
  • the molten glass GM joined at the lower end portion 9 of the molded body 4 is directly below the lower end portion 9 of the molded body 4 and has a glass GB having a plate thickness larger than the glass ribbon GR. Become.
  • This glass GB may be agglomerated to form a glass mass.
  • the glass GB is sandwiched between the edge rollers 5.
  • the glass GB supported at both ends in the width direction by the edge roller 5 is passed between the annealing rollers 10 waiting in the open state while being stretched in the width direction and the vertical direction.
  • the annealing roller 10 is changed from the open state to the closed state, and the glass GB is sandwiched by the annealing roller 10.
  • the open state refers to a state in which the facing distance between the roller pairs arranged opposite to each other in the thickness direction of the glass GB is maintained larger than the thickness of the glass GB
  • the closed state refers to the facing distance between the roller pairs. Is maintained at the same level as that of the glass GB (preferably below the plate thickness).
  • the above-described clamping operation is sequentially performed from the uppermost first roller 11. Thereby, the shape of the glass GB is gradually brought closer to the glass ribbon GR.
  • the glass GB may be stretched in the vertical direction by pulling the glass GB downward with the annealing roller 10 in addition to the action of gravity, or a tension roller (not shown) provided outside the slow cooling furnace 3 or the like. ) May be performed by pulling glass GB downward.
  • a roller (not shown) that sandwiches the glass GB and widens it in the width direction may be provided between the edge roller 5 and the uppermost annealing roller 10. The roller is preferably separated from the glass GB after the glass GB is spread in the width direction in the initial stage of the preparation process.
  • an adjustment process for adjusting the thickness of the glass GB and the direction of warping is performed.
  • the adjustment process is performed at the end of the preparation process.
  • the thickness of the glass GB is adjusted by adjusting the temperature of the forming furnace 2 and the slow cooling furnace 3, for example.
  • the glass GB is pressed with a rod-like body in the slow cooling furnace 3 to adjust the direction of warpage of the glass GB.
  • the production process is started as shown in FIG.
  • the glass ribbon GR is continuously formed from the molten glass GM joined at the lower end portion 9 of the formed body 4.
  • the formed glass ribbon GR is gradually cooled in the slow cooling furnace 3 and then cut into a predetermined dimension by a cutting device (not shown) on the downstream side in the transport direction of the slow cooling furnace 3.
  • a cutting device not shown
  • the plate glass as a glass article is manufactured from the glass ribbon GR.
  • the plate glass manufactured in this way is packed on a pallet in a state where a plurality of sheets are laminated in a vertical posture or a horizontal posture, and transported to a customer or the like.
  • the valves 23 and 24 for supplying a cooling medium (water, air, etc.) to the rollers 11 and 12 are opened.
  • the first valve 23 for supplying the cooling medium to the first roller 11 is kept open and the cooling medium is supplied to the second roller 12.
  • the second valve 24 is closed. That is, the supply of the cooling medium to the second roller 12 is stopped.
  • the rollers 11 and 12 are internally cooled in the preparation process.
  • the temperature of the glass GB and the ambient temperature tend to be relatively high, but the rollers 11 and 12 are internally cooled, thereby preventing problems such as thermal deformation and winding of the glass GB. can do.
  • the internal cooling temperature T2p of the second roller 12 in the production process is set higher than the internal cooling temperature T2r of the second roller 12 in the preparation process. Therefore, in the production process, the internal cooling of the second roller 12 is weakened, and the glass ribbon GR cooled to a strain point or less is less likely to be rapidly cooled and cracked.
  • the internal cooling temperature T1p of the first roller 11 is set lower than the internal cooling temperature T2p of the second roller 12. Therefore, even in the production process, the internal cooling of the first roller 11 is strong, and it is possible to prevent the first roller 11 from being thermally deformed and the glass ribbon GR from being wound. Even in the production process, in the first temperature region X above the strain point where the first roller 11 is disposed, the temperature of the glass ribbon GR and the ambient temperature are likely to be relatively high. Is preferred.
  • the second valve 24 is switched from the open state to the closed state, and the internal cooling temperature of the second roller 12 is changed from the internal cooling temperature T2r in the preparation process to the internal cooling temperature T2p in the production process. To do. That is, switching of the internal cooling temperature of the second roller 12 is performed immediately before the production process.
  • production failure information is notified (output).
  • This production failure information is notified in the following cases, for example.
  • the sensor 25 detects that the torque of the edge roller 5 has become a predetermined value or less, or when the rotation number of the edge roller 5 has been detected to be a predetermined value or less, the glass ribbon Information on defective production of GR is notified.
  • the glass ribbon GR runs out or breaks, the torque and the rotational speed of the edge roller 5 become a predetermined value or less.
  • the second valve 24 is switched from the closed state to the open state, and the internal cooling temperature of the second roller 12 is The internal cooling temperature T2p in the production process is changed to the internal cooling temperature T2r in the preparation process.
  • Such a change in the internal cooling temperature of the second roller 12 may be performed manually, but is preferably performed automatically using the production failure information as a trigger signal.
  • this invention is not limited to the structure of the said embodiment, It is not limited to the above-mentioned effect.
  • the present invention can be variously modified without departing from the gist of the present invention.
  • the second roller 12 is illustrated as having the second roller body 16 provided on both sides in the axial direction of the second shaft portion 15 that is supported at both ends.
  • the roller main body 28 may be provided on one side of the second shaft portion 27 that is cantilevered.
  • the second shaft portion 27 is provided with a cooling device (not shown).
  • the first roller 11 may be a cantilever type roller.
  • the case where the internal cooling temperature of the second roller 12 is relatively increased by stopping the supply of the cooling medium to the second roller 12 in the production process has been described.
  • a cooling medium may be supplied to the roller 12.
  • the supply flow rate of the cooling medium to the second roller 12 may be reduced or the temperature of the cooling medium may be increased in the production process than in the preparation process.
  • the supply flow rate of the cooling medium to the rollers 11 and 12 may be changed, or the temperature of the cooling medium may be changed.
  • the temperature of the cooling medium of the upper roller is relatively low and the temperature of the cooling medium of the lower roller is relatively high.
  • the glass article is not limited to a plate glass.
  • the glass ribbon GR when the glass ribbon GR is thin (in the case of a glass film), the glass ribbon GR may be wound into a roll by a winding device (not shown) on the downstream side in the transport direction of the slow cooling furnace 3. Thereby, the glass roll as a glass article is manufactured from glass ribbon GR.
  • the glass roll manufactured in this way is stored in a roll form or transported to a customer, for example.
  • it is preferable that the glass ribbon GR and a protective sheet are wound around the winding core and wound, and the protective sheet is interposed between the glass ribbons GR facing in the radial direction.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
PCT/JP2017/041984 2016-12-15 2017-11-22 ガラス物品の製造方法 WO2018110233A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020197008665A KR102274709B1 (ko) 2016-12-15 2017-11-22 유리 물품의 제조 방법
CN201780076299.0A CN110072819B (zh) 2016-12-15 2017-11-22 玻璃物品的制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-243500 2016-12-15
JP2016243500A JP6708970B2 (ja) 2016-12-15 2016-12-15 ガラス物品の製造方法

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WO2018110233A1 true WO2018110233A1 (ja) 2018-06-21

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JP (1) JP6708970B2 (zh)
KR (1) KR102274709B1 (zh)
CN (1) CN110072819B (zh)
TW (1) TWI725259B (zh)
WO (1) WO2018110233A1 (zh)

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

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CN109851207B (zh) * 2019-03-06 2021-10-12 彩虹显示器件股份有限公司 一种短辊夹持玻璃的牵引系统及使用方法

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CN110072819A (zh) 2019-07-30
KR20190094144A (ko) 2019-08-12
TW201834978A (zh) 2018-10-01
TWI725259B (zh) 2021-04-21
JP6708970B2 (ja) 2020-06-10
JP2018095531A (ja) 2018-06-21
CN110072819B (zh) 2021-11-30
KR102274709B1 (ko) 2021-07-08

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