WO2018232159A2 - Appareil et procédé de refroidissement d'un ruban de verre - Google Patents

Appareil et procédé de refroidissement d'un ruban de verre Download PDF

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Publication number
WO2018232159A2
WO2018232159A2 PCT/US2018/037605 US2018037605W WO2018232159A2 WO 2018232159 A2 WO2018232159 A2 WO 2018232159A2 US 2018037605 W US2018037605 W US 2018037605W WO 2018232159 A2 WO2018232159 A2 WO 2018232159A2
Authority
WO
WIPO (PCT)
Prior art keywords
tube
cooling
passage
housing portion
cooling tube
Prior art date
Application number
PCT/US2018/037605
Other languages
English (en)
Other versions
WO2018232159A3 (fr
Inventor
Tomohiro ABURADA
Anmol AGRAWAL
Steven Roy Burdette
Robert Delia
Ibraheem Rasool MUHAMMAD
Jae Hyun Yu
Original Assignee
Corning Incorporated
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 Corning Incorporated filed Critical Corning Incorporated
Publication of WO2018232159A2 publication Critical patent/WO2018232159A2/fr
Publication of WO2018232159A3 publication Critical patent/WO2018232159A3/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
    • C03B17/06—Forming glass sheets
    • C03B17/064—Forming glass sheets by the overflow downdraw fusion process; Isopipes therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • 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

Definitions

  • an apparatus for cooling a glass ribbon comprising a forming body configured to form a glass ribbon along a draw plane and a housing assembly positioned below the forming body and through which the glass ribbon is drawn in a draw direction.
  • the apparatus further comprises at least one cooling tube, for example a linear cooling tube, positioned in the housing assembly, the at least one cooling tube comprising a longitudinal axis extending parallel with the draw plane and orthogonal to the draw direction, and at least one orifice configured to direct a flow of cooling gas from the cooling tube.
  • the apparatus still further comprises a thermal plate positioned between the at least one cooling tube and the draw plane, the at least one cooling tube oriented to direct the flow of cooling gas against the thermal plate.
  • the housing assembly comprises an upper housing portion and a lower housing portion.
  • the at least one cooling tube comprises at least one orifice configured to direct a flow of cooling gas from the cooling tube.
  • the at least one orifice can comprise a plurality of orifices.
  • the at least one cooling tube comprises a first tube and a second tube positioned interior to and spaced apart from the first tube to form a gap therebetween.
  • the cooling tube may further comprise a pair of blocking members positioned in the gap between and in contact with the first tube and the second tube, the blocking members dividing the gap into a first passage and a second passage in fluid communication with the first passage.
  • the second tube defines a third passage interior to and extending along a length of the second tube and isolated from the first and second passages, the at least one orifice extending between the third passage and an exterior of the first tube.
  • the at least one orifice may, for example, comprise a slot extending along at least 50% of a length of the blocking member.
  • the upper housing portion may comprise a compartment positioned behind the thermal plate relative to the draw plane, wherein the at least one cooling tube is positioned within the compartment.
  • the compartment may be isolated from an interior atmosphere of the upper housing portion.
  • the apparatus may further comprise an exhaust tube providing fluid communication between the compartment and an atmosphere outside the upper housing portion.
  • the at least one cooling tube positioned within the lower housing portion chamber can comprise at least one orifice configured to direct a flow of cooling gas onto the glass ribbon.
  • FIG. 5C is an axial cross sectional view of the exemplary injection-type cooling tubes of FIGS. 5A and 5B;
  • FIG. 9B is a longitudinal cross sectional view of another embodiment of the exemplary injection-type cooling tube of FIG. 9 A;
  • Ranges can be expressed herein as from “about” one particular value, and/or to "about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about,” it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.
  • molten glass shall be construed to mean a molten material which, upon cooling, can enter a glassy state.
  • molten glass is used synonymously with the term “melt”.
  • the molten glass may form, for example, a majority silicate glass, although the present disclosure is not so limited.
  • the ribbon typically leaves the forming body at a temperature in excess of 1000°C, but must be cooled to a temperature less than only several hundred degrees in a very short distance, since the ribbon is typically drawn in a vertical downward direction and as a practical matter available vertical distance is often limited.
  • the cooling of a glass ribbon drawn from a forming body in a down draw process is further complicated by the need to minimize air currents within the draw area, including convection currents directly attributable to the cooling means, as air currents across the ribbon can cause thickness variations in the surface of the ribbon.
  • the glass manufacturing apparatus 10 can comprise a glass melting furnace 12 that can include a melting vessel 14.
  • glass melting furnace 12 can optionally include one or more additional components such as heating elements (e.g., combustion burners and/or electrodes) configured to heat raw material and convert the raw material into molten glass.
  • heating elements e.g., combustion burners and/or electrodes
  • melting furnace 14 may be an electrically-boosted melting vessel, wherein energy is added to the raw material through both combustion burners and by direct heating, wherein an electric current is passed through the raw material, and thereby adding energy via Joule heating of the raw material.
  • an electrically- boosted melting vessel is a melting vessel that obtains heat energy from both Joule heating and above-surface combustion heating, and the amount of energy imparted to the raw material and/or melt via Joule heating is equal to or greater than about 20%.
  • an electrically-boosted melting vessel does not include submerged combustion processes.
  • the heat energy added to the molten material by Joule heating (X) compared to the total heat energy added to the molten material via both above-surface combustion burners (Y) and Joule heating can be in a range from about 20% to about 80%.
  • glass melting fumace 12 may include thermal management devices (e.g., insulation components) that reduce heat loss from the melting vessel.
  • glass melting fumace 12 may include electronic devices and/or electromechanical devices that facilitate melting of the raw material into a glass melt.
  • glass melting furnace 12 may include support structures (e.g., support chassis, support member, etc.) or other components.
  • Glass melting vessel 14 is typically formed from a refractory material, such as a refractory ceramic material, for example a refractory ceramic material comprising alumina or zirconia, although the refractory ceramic material may comprise other refractory materials, such as yttrium (e.g., yttria, yttria stabilized zirconia, yttrium phosphate), zircon (ZrSi04) or alumina-zirconia-silica or even chrome oxide, used either alternatively or in any combination.
  • glass melting vessel 14 may be constructed from refractory ceramic bricks.
  • Glass manufacturing apparatus 10 can optionally include an upstream glass manufacturing apparatus 16 positioned upstream relative to glass melting vessel 14. In some examples, a portion of, or the entire upstream glass manufacturing apparatus 16, may be incorporated as part of the glass melting furnace 12.
  • the upstream glass manufacturing apparatus 16 can include a raw material storage bin 18, a raw material delivery device 20 and a motor 22 connected to the raw material delivery device.
  • Storage bin 18 may be configured to store a quantity of raw material 24 that can be fed into melting vessel 14 of glass melting furnace 12 through one or more feed ports, as indicated by arrow 26.
  • Raw material 24 typically comprises one or more glass forming metal oxides and one or more modifying agents.
  • raw material delivery device 20 can be powered by motor 22 such that raw material delivery device 20 delivers a predetermined amount of raw material 24 from the storage bin 18 to melting vessel 14.
  • Glass manufacturing apparatus 10 can also optionally include a downstream glass manufacturing apparatus 30 positioned downstream of glass melting fumace 12 relative to a flow direction of the molten glass 28.
  • a portion of downstream glass manufacturing apparatus 30 may be incorporated as part of glass melting furnace 12.
  • first connecting conduit 32 discussed below, or other portions of the downstream glass manufacturing apparatus 30, may be incorporated as part of the glass melting fumace 12.
  • Elements of the downstream glass manufacturing apparatus, including first connecting conduit 32, may be formed from a precious metal. Suitable precious metals include platinum group metals selected from the group of metals consisting of platinum, iridium, rhodium, osmium, ruthenium and palladium, or alloys thereof.
  • Downstream glass manufacturing apparatus 30 can include a first conditioning (i.e. processing) vessel, such as fining vessel 34, located downstream from melting vessel 14 and coupled to melting vessel 14 by way of the above-referenced first connecting conduit 32.
  • a first conditioning (i.e. processing) vessel such as fining vessel 34
  • molten glass 28 may be gravity fed from melting vessel 14 to fining vessel 34 by way of first connecting conduit 32.
  • gravity may drive molten glass 28 through an interior pathway of first connecting conduit 32 from melting vessel 14 to fining vessel 34.
  • other conditioning vessels may be positioned downstream of melting vessel 14, for example between melting vessel 14 and fining vessel 34.
  • the enlarged gas bubbles with increased buoyancy can then rise to a free surface of the molten glass within the fining vessel and thereafter be vented out of the fining vessel.
  • the oxygen bubbles can further induce mechanical mixing of the molten glass in the fining vessel as they rise through the molten glass.
  • the molten glass within the mixing apparatus includes a free surface, with a free volume extending between the free surface and a top of the mixing apparatus.
  • mixing apparatus 36 may be positioned upstream from fining vessel 34 in other embodiments.
  • downstream glass manufacturing apparatus 30 may include multiple mixing apparatus, for example a mixing apparatus upstream from fining vessel 34 and a mixing apparatus downstream from fining vessel 34. These multiple mixing apparatus may be of the same design, or they may be of a different design from one another.
  • one or more of the vessels and/or conduits may include static mixing vanes positioned therein to promote mixing and subsequent homogenization of the molten material.
  • Downstream glass manufacturing apparatus 30 can further include forming apparatus 48 comprising the above-referenced forming body 42, including inlet conduit 50.
  • Exit conduit 44 can be positioned to deliver molten glass 28 from delivery vessel 40 to inlet conduit 50 of forming apparatus 48.
  • Forming body 42 in a fusion down draw glass making apparatus can comprise a trough 52 positioned in an upper surface of the forming body and converging forming surfaces 54 (only one surface shown) that converge in a draw direction along a bottom edge (root) 56 of the forming body.
  • Molten glass delivered to the forming body trough via delivery vessel 40, exit conduit 44 and inlet conduit 50 overflows the walls of the trough and descends along the converging forming surfaces 54 as separate flows of molten glass.
  • Forming apparatus 48 may further include cooling doors 114, such as a pair of cooling doors, positioned adjacent forming body root 56 and above housing assembly 102, e.g., between enclosure assembly 100 and housing assembly 102. Cooling doors 114 are arranged on opposite sides of draw plane 1 16 extending through root 56.
  • the glass ribbon 58 may be drawn from root 56 in draw direction 60 along draw plane 116.
  • draw plane 116 may bisect forming body 42.
  • Draw plane 116 may be, for example, a vertical plane. However, it should be understood that draw plane 116 may extend at other orientations and need not bisect the forming body.
  • Cooling doors 1 14 can be movable in a direction orthogonal to draw plane 1 16, as indicated by arrows 118.
  • Each cooling door 1 14 comprises a plurality of cooling tubes 120 positioned therein, cooling tubes 120 each comprising a longitudinal axis extending substantially orthogonal to draw plane 116.
  • Each cooling tube 120 further includes an open end 122 positioned adjacent thermal plate 124, thermal plate 124 facing draw plane 116 and extending widthwise in a direction parallel with draw plane 1 16.
  • Cooling tubes 120 are supplied with cooling gas 125, such as air, that is exhausted from open ends 122 of cooling tubes 120 and impinges against a back surface of thermal plates 124 opposite draw plane 1 16.
  • cooling fluid 218 enters first passage 214, flowing along first passage 214 in a direction toward proximal end 204 opposite the direction the cooling fluid took when traversing through second passage 216. Cooling fluid 218 leaving first passage 214 can be collected and recycled back through first and second tubes 200, 208, such as after filtering (and chilling if desired), or cooling fluid 218 can be discarded as waste and treated appropriately. Cooling fluid 218 may be a liquid cooling fluid, a gaseous cooling fluid, or cooling fluid may comprise both liquid and gas.
  • tube 300 may comprise a plurality of shorter slots, i.e., wherein each slot of the plurality of slots is equal to or less than about 40% of the length of tube 300, for example equal to or less than about 25%, equal to or less than about 15%, or equal to or less than about 5% of the length of tube 400.
  • the plurality of orifices regardless of shape, may be linearly aligned, e.g., parallel with longitudinal axis 302, although in further embodiments, the plurality of orifices may be arranged in other patterns.
  • cooling tube 148a comprises a third tube 414 disposed interior to and spaced apart from second tube 408, third tube 414 extending along longitudinal axis 402 between proximal end 416 and an open distal end 418.
  • First, second and third tubes 400, 408 and 414 may be formed from any material capable of withstanding temperatures in excess of 400°C, for example in excess of 600°C, such as in excess of 800°C.
  • first, second and third tubes 400, 408 and 414 may be formed of stainless steel.
  • Other suitable materials can include nickel alloys, titanium alloys, molybdenum alloys, tungsten alloys and cobalt alloys, for example Hastelloy® brand metals produced by Haynes International.
  • the at least one orifice 430 may be a single high aspect ratio slot extending along at least a portion of the length of tube 400, for example at least 25% of the length of first tube 400 between the proximal and distal ends 404, 406, such as equal to or greater than 50% of the length, for example equal to or greater than 75% of the length of tube 400.
  • a single slot extending equal to or greater than about 25% of the length of first tube 400 may be aligned parallel with longitudinal axis 402.
  • FIGS. 7 A, 7B and 7C illustrate a longitudinal cross sectional view and an axial cross sectional view, respectively, of still another exemplary injection-type cooling tube 148. More specifically, FIGS. 7A - 7C show a cooling tube 148d comprising first, outer tube 500 extending along longitudinal axis 502 between proximal end 504 and distal end 506.
  • first tube 500 may be a cylindrical tube, although in other embodiments first tube 500 can have other cross sectional shapes in a plane orthogonal to longitudinal axis 502, such as a rectangular cross sectional shape, an elliptical cross sectional shape, a triangular cross sectional shape, or any other suitable cross sectional shape.
  • the injection-type cooling tubes represented by the embodiments shown FIGS. 5A - 5C, 6A - 6C and 7 A - 7C entail heating of the cooling fluid exhausted from the one or more orifices. That is, since the primary cooling fluid in each case traverses a passage directly adjacent the outside environment, when that outside environment is a hot environment, the cooling fluid is heated by the outside environment as the cooling gas traverses the length of the cooling tube.
  • the result may be uneven cooling of the glass ribbon from one edge of the ribbon to the opposite edge.
  • First cooling fluid 640 exiting first passage 616 can be recovered, for example in a closed loop system, whereupon the first cooling fluid may be filtered and/or chilled and/or otherwise processed, and then returned to central passage 624, or first cooling fluid 630 may be discharged as waste and treated accordingly.
  • first cooling fluid 640 can be a liquid, such as water.
  • first cooling fluid 640 can be another cooling medium, such as a cooling gas, such as air.
  • Cooling tube 148f may further comprise an inner, second tube 710 extending along longitudinal axis 702 between proximal end 712 and closed distal end 714 along longitudinal axis 702, second tube 710 positioned interior to and spaced apart from first tube 700, forming a gap between first tube 700 and second tube 710.
  • second tube 710 may comprise a circular cross sectional shape concentric with first tube 700, although in further embodiments, second tube 710 can have other cross sectional shapes, such as an elliptical shape or a rectangular shape, or any other suitable shape.
  • At least two blocking members 716, 718 are positioned in the gap between first and second tubes 700, 710 and extend along at least a portion of a length of second tube 710, dividing the gap between first tube 700 and second tube 710 into first and second passages 720 and 722 that are in fluid communication with each between distal end 714 and distal end 706.
  • Blocking members 716 and 718 each further extend across an azimuthal angular range between first tube 700 and second tube 710, i.e., over an angle ⁇ .
  • Angle ⁇ may be, for example, equal to or less than 90 degrees, for example equal to or less than about 45 degrees, or even equal to or less than about 20 degrees, although each blocking member may extend over other angles.
  • a second cooling fluid 732 for example a cooling gas, such as air, is supplied to central passage 724 at proximate end 712 of second tube 710. Second cooling fluid 732 is prevented from exiting at closed distal end 714 of second tube 710, and is forced out of central passage 724 through the at least one orifice 726 extending from third passage 724 through a wall of second tube 710, blocking members 716, 718, and first tube 700 to the environment exterior to cooling tube 148f.
  • each blocking member 716, 718 may comprise a plurality of orifices 726 extending therethrough. However, in other embodiments, only a single orifice 726 in each blocking member may be present.
  • exhausted cooling gas e.g., cooling gases 312, 428, 544, 642, 732
  • at least one exhaust tube 750 may be provided, the at least one exhaust tube 750 extending from compartment 136 to an atmosphere external to upper housing portion 126.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)

Abstract

L'invention concerne un appareil pour refroidir un ruban de verre étiré le long d'un plan d'étirage à travers les chambres d'un ensemble boîtier, l'ensemble boîtier comprenant un compartiment séparé des chambres de l'ensemble boîtier par une plaque thermique, et au moins un tube de refroidissement s'étendant le long de la plaque thermique et parallèle à celle-ci, le ou les tubes de refroidissement étant conçus pour faire circuler un fluide de refroidissement contre une surface de la plaque thermique située à l'opposé du plan d'étirage.
PCT/US2018/037605 2017-06-14 2018-06-14 Appareil et procédé de refroidissement d'un ruban de verre WO2018232159A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762519501P 2017-06-14 2017-06-14
US62/519,501 2017-06-14

Publications (2)

Publication Number Publication Date
WO2018232159A2 true WO2018232159A2 (fr) 2018-12-20
WO2018232159A3 WO2018232159A3 (fr) 2019-01-24

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WO (1) WO2018232159A2 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112811793A (zh) * 2021-01-29 2021-05-18 彩虹显示器件股份有限公司 一种溢流法玻璃基板成型厚度控制装置和方法
WO2021225810A1 (fr) * 2020-05-04 2021-11-11 Corning Incorporated Procédés et appareil de fabrication d'un ruban de verre
WO2022040164A1 (fr) * 2020-08-18 2022-02-24 Mattson Technology, Inc. Système de traitement thermique rapide avec système de refroidissement
CN114144382A (zh) * 2019-07-01 2022-03-04 康宁公司 玻璃形成装置及方法
CN114341066A (zh) * 2019-06-28 2022-04-12 康宁公司 用于生产玻璃带的方法和设备

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102725238B (zh) * 2009-11-24 2015-07-01 康宁股份有限公司 用于制造具有受控厚度的玻璃板的方法和装置
JP5838966B2 (ja) * 2010-11-18 2016-01-06 旭硝子株式会社 ガラス板の製造装置およびガラス板の製造方法
TWI631083B (zh) * 2013-05-31 2018-08-01 康寧公司 用於生產玻璃帶的方法及設備
DE102014106817A1 (de) * 2014-05-14 2015-11-19 Schott Ag Verfahren und Vorrichtung zur Herstellung eines Dünnglas-Bands und verfahrensgemäß hergestelltes Dünnglas-Band
US20170305777A1 (en) * 2014-09-24 2017-10-26 Corning Incorporated Volatile filtration systems for fusion draw machines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114341066A (zh) * 2019-06-28 2022-04-12 康宁公司 用于生产玻璃带的方法和设备
CN114144382A (zh) * 2019-07-01 2022-03-04 康宁公司 玻璃形成装置及方法
WO2021225810A1 (fr) * 2020-05-04 2021-11-11 Corning Incorporated Procédés et appareil de fabrication d'un ruban de verre
WO2022040164A1 (fr) * 2020-08-18 2022-02-24 Mattson Technology, Inc. Système de traitement thermique rapide avec système de refroidissement
CN112811793A (zh) * 2021-01-29 2021-05-18 彩虹显示器件股份有限公司 一种溢流法玻璃基板成型厚度控制装置和方法

Also Published As

Publication number Publication date
TW201904891A (zh) 2019-02-01
WO2018232159A3 (fr) 2019-01-24

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