US3503728A - Float glass tank with replaceable bottom wall means - Google Patents

Float glass tank with replaceable bottom wall means Download PDF

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Publication number
US3503728A
US3503728A US613958A US3503728DA US3503728A US 3503728 A US3503728 A US 3503728A US 613958 A US613958 A US 613958A US 3503728D A US3503728D A US 3503728DA US 3503728 A US3503728 A US 3503728A
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United States
Prior art keywords
bath
bottom wall
temperature
tank
wall means
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Expired - Lifetime
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US613958A
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English (en)
Inventor
Kiyoshi Itakura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Sheet Glass Co Ltd
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Nippon Sheet Glass Co Ltd
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Filing date
Publication date
Application filed by Nippon Sheet Glass Co Ltd filed Critical Nippon Sheet Glass Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B18/00—Shaping glass in contact with the surface of a liquid
    • C03B18/02—Forming sheets
    • C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall

Definitions

  • Sheet glass manufacturing apparatus contains a molten metal bath and includes a bottom wall floor being made of refractory material and being provided with external cooling means.
  • the bath is partitioned into two or more zones by means of at least one dam traversing widthwise of the bath.
  • the iioor of the bottom wall in at least one of the zones is replaced in part with a member having better thermal conductivity than the other parts of the floor. The result is to achieve transverse temperature uniformity across the width of the molten metal bath.
  • This invention relates to the control of the temperature of a metal bath, which is used in the method of making glass continuously by utilizing a molten metal bath.
  • the molten glass is continuously spread out upon said bath into a ribbon, and is cooled as it advances over the bath to be solidified to such an extent that it will be not be damaged when being conveyed by the transporting rolls, following which it is removed from the bath and submitted to the subsequent operations.
  • a temperature control technique of this sort however requires a very long metal bath and is economically unfavorable.
  • This invention provides a sheet glass manufacturing apparatus comprising a bath of molten metal whose function is to receive thereon molten glass fed at a controlled rate, which glass is rendered into a ribbon and advanced over said bath, a basin of said bath being made of refractory material and provided with external cooling means for cooling said basin, characterized in that said molten metal bath is partitioned into at least t-wo zones 3,503,728 Patented Mar. 31, 1970 ICC by means of at least one dam which traverses widthwise of the bath and that at least one part of the oor of at least one of said zones has better thermal conductivity than the other parts of the Hoor.
  • the length of the molten metal bath be made shorter than those used heretofore, but also the regulation of the temperature such that its uniform distribution widthwise of the bath as well as the desired changes in the temperature longitudinally of the bath can be accomplished very readily.
  • FIG. 1 is a schematic side view in longitudinal section illustrating an embodiment of this invention, FIG. 2 being a schematic sectional plan view of FIG. 1; and FIG. 3 is a schematic side view in longitudinal section, as in the case of FIG. 1, illustrating another embodiment of the invention.
  • the numeral 1 denotes the molten glass, 2, the lip tile, 3, the damper for adjusting the amount of glass iiowing down and 4, the glass ribbon.
  • the numerals 5, 6, 7 and 8 indicate the refractory material which is used for the iioor of the bath, while 9 is the refractory material which constitutes the side walls of the bath.
  • the numeral 10 denotes the dams, 11, the floor coolers, 12, the coolers at the upper part of the side walls, and 13, the burners. Coolers 11 and 12 are of the water-cooled type.
  • the bath is partitioned into a heating zone 15, an adjusting zone 16, a rapid-cooling zone 17 and a slowcooling zone 18, between which zones dams 10 are provided.
  • Dams 10 serve to hold the commingling of the molten metal to a minimum, and thus temperature control is had over the molten metal in the several zones independently of each other.
  • Tin and the like are used for the molten metal.
  • the material used for the dams 10 is one which not only possesses relatively strong mechanical strength but also which is not corroded by tin nor is easily wetted by the molten glass. For example, graphite and the like are used.
  • the molten glass 1 which is fed onto the molten metal bath is formed into a sheetlike glass of a given thickness at the heating zone 15 where the temperature of the tin is at about 1000 C., and then it proceeds over the metal bath and is delivered to the adjusting zone 16.
  • the tin temperature in the middle part widthwise of the metal bath can be lowered by replacement of the floor bricks of the metal bath in said part with an insert-like member of a material, e.g. graphite 19, which is spaced from both lateral side walls, and which not only has better thermal conductivity than the material of the other parts of the ioor but also does not react with the molten tin often used for the bath medium.
  • the metal bath has a tendency wherein the bath widthwise thereof becomes cooled at its two sides with the consequence that the temperature at the middle part becomes higher.
  • the tin temperature in the middle of the bath can be lowered to uniformalize the temperature distribution transversely of the bath.
  • Side walls and other parts of the floor of the metal bath, except the part of said Iiioor where graphite is used are constituted with ordinary refractories whose thermal conductivity is inferior to graphite.
  • a part of the floor bricks of the metal bath is replaced over its entire width with a material 20 such as the aforesaid graphite which has better thermal conductivity than the material of the other parts of said oor, thereby ensuring a drop in the temperature of the tin bath of at least about 20G-400 C. from that of the adjusting zone 16.
  • the slow-cooling zone 18 has the function of gradually cooling the glass ribbon which has been cooled in the rapid-cooling zone and uniformalizing Y the temperature distribution of the glass ribbon.
  • the middle part 21 of the floor bricks in the lateral direction of the'metal bath is also replaceable with the aforementioned graphite, in a manner similar to that for piece 19 in zone 16, thereby accomplishing the lowering of the temperature of the glass ribbon while uniformly controlling the temperature distribution widthwise of the metal bath.
  • the temperature of the metal bath is maintained at above l000 C. in the heating zone and ca. 550 C. in the slow-cooling zone. Further, the whole Hoor of the slow-cooling zones does not have to be provided with a cooler; the cooling means may be just provided at the graphite part.
  • the refractory material 19, 20 and 21 of FIG. 1, which constitute the essential parts of the oor of the bath, can be replaced with thinner refractory materials 22, 23 and 24, thereby reducing the temperature of the tin which comes in Contact with the thinner refractory material, and thus attaining the same results.
  • Tank apparatus for manufacture of flat sheet glass by the lloat process wherein a tank-supported bath of molten metal is utilized to floatingly receive thereon a ribbon of molten glass fed and advanced at a controlled rate over said bath, comprising in combination:
  • a tank including interjoined bottom, side and end wall means formed of a refractory material different from and having a lower thermal conductivity than graphite and receiving and supporting a molten metal bath therein;
  • dam means for partitioning said tank and molten metal therein into at least two positive and separate zones by at least one dam member which traverses the tank widthwise,
  • said bottom wall means of at least one of said zones being replaced in part with a graphite member positioned at a central portion spaced from both lateral side ends of the bottom wall means, whereby the temperature of the molten metal at a position corresponding to said central portion is dissipated through said graphite member to help uniformalize the temperature distribution transversely of the molten metal bath.
  • dam means of paragraph (b) include a plurality of spaced transverse dam members to define a first heating zone, an adjusting zone, and rapid-and-slow cooling zones, and said bottom wall means further includes means to vary the thermal conductivity of one transverse portion thereof in each of said zones following the initial first-heating zone and in those zones other than the at least one zone defined in paragraph (d).
  • Tank apparatus for manufacture of flat sheet glass by the float process wherein a tank-supported bath of molten metal is utilized to floatingly receive thereon a ribbon of molten glass-fed and advanced at a controlled rate over said bath, comprising in combination:
  • dam means for partitioning said tank and molten metal therein into at least two positive and separate zones by at least one dam member which traverses the tank widthwise,
  • said bottom wall means in at least one of said Zones being replaced in part with an insert-like member of refractory material having a smaller thickness than that of said bottom wall means, said thinner refractory material member being inserted into a central portion of said bottom wall means spaced from both lateral side ends of the bottom wall means, whereby the temperature of the moten metal bath at a position corresponding to said central portion is reduced through said thinner refractory material member to uniformalize the temperature distribution transversely of said bath.
  • Tank apparatus as defined in claim 3 wherein the insert-like member of paragraph (d) is of the same kind of refractory material as that of the other bottom wall means.
  • Tank apparatus as dened in claim 3 further including cooling means adjacent said tank walls to selectively expedite dissipation of heat therethrough.
  • Tank apparatus as defined in claim 3 further including cooling means adjacent said tank walls to selectively expedite dissipation of heat therethrough, said cooling means including separate cooling circuit means embracing said side and end wall means to selectively expedite dissipation of heat therethrough.
  • Tank apparatus as defined in claim 3 further including cooling means adjacent said tank walls to selectively expedite dissipation of heat therethrough, said cooling means including separate cooling circuit means adjacent said bottom wall means to expedite dissipation of heat therethrough.
  • Tank apparatus as defined in claim 3 further including top wall means spaced above the molten bath to enclose the tank, said top wall means including means separating said top wall into zoned segments and heating means in said top wall throughout the respective zoned segments to help maintain the metal bath at a temperature above l000 C. in the initial first heat zone and at progressively lower temperatures to about 550 C. in a last or slow-cooling zone.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
US613958A 1966-02-14 1967-02-03 Float glass tank with replaceable bottom wall means Expired - Lifetime US3503728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP41008401A JPS4910132B1 (pl) 1966-02-14 1966-02-14

Publications (1)

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US3503728A true US3503728A (en) 1970-03-31

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US613958A Expired - Lifetime US3503728A (en) 1966-02-14 1967-02-03 Float glass tank with replaceable bottom wall means

Country Status (6)

Country Link
US (1) US3503728A (pl)
JP (1) JPS4910132B1 (pl)
BE (1) BE693913A (pl)
DE (1) DE1596539C3 (pl)
ES (1) ES336492A1 (pl)
FR (1) FR1511817A (pl)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652252A (en) * 1968-10-04 1972-03-28 Glaverbel Tank furnace for the treatment of glass by the float process
US3770407A (en) * 1971-04-02 1973-11-06 Pilkington Brothers Ltd Glass manufacturing methods
DE2457293A1 (de) * 1973-12-12 1975-06-26 Pilkington Brothers Ltd Floatverfahren und vorrichtung zu seiner durchfuehrung
US3928012A (en) * 1973-03-06 1975-12-23 Ppg Industries Inc Method and apparatus for regulating the temperature of a glass sheet float tank
US3930828A (en) * 1974-06-27 1976-01-06 Ppg Industries, Inc. Thermal control in a glass sheet forming chamber
US4131446A (en) * 1976-11-30 1978-12-26 Pilkington Brothers Limited Method and apparatus for manufacturing flat glass on molten metal
US4174207A (en) * 1978-07-26 1979-11-13 Ppg Industries, Inc. Method and apparatus utilizing transversely inclined barriers in float glass formation
DE102006030384A1 (de) * 2006-07-01 2007-06-06 Schott Ag Floatglasanlage mit unterhalb der Badoberfläche angeordneten Barrieren

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1316662A (en) * 1970-04-16 1973-05-09 Pilkington Brothers Ltd Glass manufacturing methods
DE2608052C2 (de) * 1976-02-27 1982-12-30 Vereinigte Glaswerke Gmbh, 5100 Aachen Flüssigkeitspumpe für das schmelzflüssige Metall einer Floatglasanlage
DE10307661B4 (de) * 2002-03-06 2005-03-24 Schott Ag Floatbadwanne und Verfahren zum Floaten eines Glases
WO2016048815A1 (en) * 2014-09-22 2016-03-31 Corning Incorporated Glass manufacturing apparatus and methods

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326652A (en) * 1962-09-29 1967-06-20 Glaverbel Brussels Apparatus and process for refining glass and for continuously manufacturing sheet glass
US3393061A (en) * 1965-10-19 1968-07-16 Ford Motor Co Method and apparatus for preventing bubbles in float glass apparatus
US3399985A (en) * 1965-10-19 1968-09-03 Ford Motor Co Glass making apparatus with greater transverse heat conduction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3326652A (en) * 1962-09-29 1967-06-20 Glaverbel Brussels Apparatus and process for refining glass and for continuously manufacturing sheet glass
US3393061A (en) * 1965-10-19 1968-07-16 Ford Motor Co Method and apparatus for preventing bubbles in float glass apparatus
US3399985A (en) * 1965-10-19 1968-09-03 Ford Motor Co Glass making apparatus with greater transverse heat conduction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3652252A (en) * 1968-10-04 1972-03-28 Glaverbel Tank furnace for the treatment of glass by the float process
US3770407A (en) * 1971-04-02 1973-11-06 Pilkington Brothers Ltd Glass manufacturing methods
US3928012A (en) * 1973-03-06 1975-12-23 Ppg Industries Inc Method and apparatus for regulating the temperature of a glass sheet float tank
DE2457293A1 (de) * 1973-12-12 1975-06-26 Pilkington Brothers Ltd Floatverfahren und vorrichtung zu seiner durchfuehrung
US3930828A (en) * 1974-06-27 1976-01-06 Ppg Industries, Inc. Thermal control in a glass sheet forming chamber
US4131446A (en) * 1976-11-30 1978-12-26 Pilkington Brothers Limited Method and apparatus for manufacturing flat glass on molten metal
US4174207A (en) * 1978-07-26 1979-11-13 Ppg Industries, Inc. Method and apparatus utilizing transversely inclined barriers in float glass formation
DE102006030384A1 (de) * 2006-07-01 2007-06-06 Schott Ag Floatglasanlage mit unterhalb der Badoberfläche angeordneten Barrieren

Also Published As

Publication number Publication date
DE1596539B2 (de) 1974-11-21
FR1511817A (fr) 1968-02-02
DE1596539C3 (de) 1975-07-03
BE693913A (pl) 1967-07-17
ES336492A1 (es) 1968-01-01
JPS4910132B1 (pl) 1974-03-08
DE1596539A1 (de) 1971-03-04

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