US3540703A - Continuous lehr for the heat treatment of glass-based materials - Google Patents

Continuous lehr for the heat treatment of glass-based materials Download PDF

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Publication number
US3540703A
US3540703A US720816A US3540703DA US3540703A US 3540703 A US3540703 A US 3540703A US 720816 A US720816 A US 720816A US 3540703D A US3540703D A US 3540703DA US 3540703 A US3540703 A US 3540703A
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US
United States
Prior art keywords
heating chamber
lehr
glass
heat treatment
based materials
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US720816A
Other languages
English (en)
Inventor
Mikhail Ivanovich Kozmin
Ivan Fedotovich Mashir
Vasily Semenovich Bezbozhny
Veniamin Matveevich Olomsky
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.)
Ordena Trudovogo Krasnogo Znameni Zavod Avtosteklo
Original Assignee
Ordena Trudovogo Krasnogo Znameni Zavod Avtosteklo
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
Priority claimed from SU1144460A external-priority patent/SU282621A1/ru
Application filed by Ordena Trudovogo Krasnogo Znameni Zavod Avtosteklo filed Critical Ordena Trudovogo Krasnogo Znameni Zavod Avtosteklo
Application granted granted Critical
Publication of US3540703A publication Critical patent/US3540703A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B25/00—Annealing glass products
    • C03B25/04—Annealing glass products in a continuous way
    • C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
    • C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
    • C03B29/04—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way
    • C03B29/06—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a continuous way with horizontal displacement of the products
    • C03B29/08—Glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
    • C03B32/02—Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles

Definitions

  • the present invention relates to lehrs for heat-treating and more particularly for' effecting crystallization of glass-based materials.
  • the lehrs are used for annealing glass, the process being employed to remove stresses, set up in glass, by slowly cooling it within the range of temperatures .from 610-590"C. to 420-370C. and by subsequent intenpart is direct-fired or heated by electric heaters situated under the roof, the products of combustion being removed from the chamber and underhearth ducts through flue ducts.
  • An the object of this invention is to provide a continuous lehr with an improved method of heating its heating chamber to insure the temperature conditions required for crystallization of glass-based materials.
  • Described in the present invention is a continuous lehr'for the heat treatment of glass-based materials with a conveying device which transports the material through the heating chamber of the lehr, this heating chamber being direct-fired in its upper and lower parts, and connected to flue ducts.
  • a hearth grating is provided below the conveying device to form combustion chambers under it, the combustion products entering from these combustion chambers into the heating chamber via the hearth grating.
  • cross partitions with apertures for the conveying device are provided in the, heating chamber of thelehr, the latter being thus subdivided by the partitions into several working chambers interconnected through the apertures.
  • the combustion chambers, under the hearth grating are longitudinally subdivided into several ducts, the preferred number of such ducts being two.
  • An advantageof the present invention is that it makes it possible to develop, by simple'means, the desired temperature conditions for the upper and lower parts of the heating chamber as well as to achieve a uniform heatingthroughout the material to be crystallized.
  • Another advantage of the invention is the possibility of maintaining and controlling the temperature conditions along the whole length of each working compartment as required for the crystallization process of the glass material.
  • FIG. 1 is a schematic representation of a continuous lehr according to the invention, shown in a longitudinal section;
  • FIG. 2 is the head portion of the lehr on enlarged'scale
  • FIG. 3 is an enlarged stepped section through line ABCD of the lehr, shown in FIG. 2.
  • the proposed continuous lehr for the heat treatment of glass-based materials has a direct-fired heating chamber I (FIGS. 1 and 3) defined by longitudinal sidewalls 2, roof 3 and hearth grating 4, enclosed in a metal framework 5 which carries and binds together the brickwork of the lehr.
  • I direct-fired heating chamber
  • the heating chamber 1 is direct-fired and ports and II are provided in the sidewalls 2 for this purpose.
  • the parts arearranged in a staggered pattern in their corresponding rows.
  • lnspirator-type gas burners 12 connected to manifold 13 of a combustible gas supply'are mounted at the entry of the ports 10 and 1].
  • the ports 11 discharge intocombustion chambers 14 formed under the hearth grating 4 through which the products of combustion are delivered into the heating chamber 1 via holes 15 of the grating.
  • the combustion chambers 14 are-separated by cross or transverse partitions 16 (FIGS. 1 and 2) while in the longitudinal direction these chambers are subdivided by partitions 17 into two parallel ducts 14a and 14b as shown in FIG. 3.
  • partitions 16 of two adjacent combustion chambers 14 vertical ducts 19 are provided, closed by slide dampers l8 and connecting the working space of the heating chamber 1 to a horizontal underhearth duct 20 whose middle portion enters flue duct 21 (FIG. 1). From the upper part of the heating chamber 1, the
  • the latter may be subdivided into several working compartments la, lb, lc(FIG. l) by means of cross partitions 2 8 with apertures 29 to let the material pass along the conveying device 9 and to connect the working compartments with each other.
  • thermocouples mounted in the heating chamber 1 and the combustion chambers 14.
  • the gas atmosphe're within the lehr is controlled by means of pressure indicators (not shown) and is adjusted by means of the slide dampers l8 and 22.
  • the rate of travel of the strip in the heating chamber '1 is adjusted by'changing the speed of the drive of the conveying device 9.
  • a continuous le'hr for the heat treatment of a glass-based material comprising: means providing a heating chamber having upper and lower parts, means for heating the heating chamber in its upper and lower parts respectively by direct-firing; a conveying device for transporting said material,
  • a lehr as claimed in claim 1 comprising a vault covering the heating chamber, means above the vault providing a horizontal duct extending along said heating chamber and connected by selected of said flue ducts to the latter, and slide dampers between the horizontal duct and heating chamber.
  • a lehr as claimed in claim 3 comprising cross partitions separating the combustion chambers. means providing vertical ducts between the latter said cross partitions coupling adjacent combustion chambers, and slide dampers in said vertical ducts.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Tunnel Furnaces (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
US720816A 1967-04-14 1968-04-12 Continuous lehr for the heat treatment of glass-based materials Expired - Lifetime US3540703A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SU1144460A SU282621A1 (ru) 1967-04-14 Установка для непрерывного изготовления листового стеклокристаллического материала
SU1144461 1967-04-14
SU1144462 1967-04-14

Publications (1)

Publication Number Publication Date
US3540703A true US3540703A (en) 1970-11-17

Family

ID=27356164

Family Applications (1)

Application Number Title Priority Date Filing Date
US720816A Expired - Lifetime US3540703A (en) 1967-04-14 1968-04-12 Continuous lehr for the heat treatment of glass-based materials

Country Status (5)

Country Link
US (1) US3540703A (en:Method)
AT (1) AT290756B (en:Method)
BE (1) BE713424A (en:Method)
FR (1) FR1559535A (en:Method)
GB (1) GB1198202A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249895A (en) * 1977-10-07 1981-02-10 Welko Industriale S.P.A. Kiln
EP0504117A1 (en) * 1991-03-08 1992-09-16 POPPI S.p.A. A tempering furnace, in particular for sheets of glass and similar
US20120094079A1 (en) * 2009-03-31 2012-04-19 Falk Gabel Glass ceramic article and method and device for ceramizing glass

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4249895A (en) * 1977-10-07 1981-02-10 Welko Industriale S.P.A. Kiln
EP0504117A1 (en) * 1991-03-08 1992-09-16 POPPI S.p.A. A tempering furnace, in particular for sheets of glass and similar
US20120094079A1 (en) * 2009-03-31 2012-04-19 Falk Gabel Glass ceramic article and method and device for ceramizing glass
US9302931B2 (en) * 2009-03-31 2016-04-05 Schott Ag Glass ceramic article and method and device for ceramizing glass

Also Published As

Publication number Publication date
DE1758114B2 (de) 1972-11-02
BE713424A (en:Method) 1968-10-09
GB1198202A (en) 1970-07-08
FR1559535A (en:Method) 1969-03-07
DE1758114A1 (de) 1970-12-23
AT290756B (de) 1971-06-25

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