GB1523595A - Electrical resistance furnaces - Google Patents

Electrical resistance furnaces

Info

Publication number
GB1523595A
GB1523595A GB4721574A GB4721574A GB1523595A GB 1523595 A GB1523595 A GB 1523595A GB 4721574 A GB4721574 A GB 4721574A GB 4721574 A GB4721574 A GB 4721574A GB 1523595 A GB1523595 A GB 1523595A
Authority
GB
United Kingdom
Prior art keywords
shell
inert gas
furnace
graphite
shield
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
Application number
GB4721574A
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.)
National Research Development Corp UK
National Research Development Corp of India
Original Assignee
National Research Development Corp UK
National Research Development Corp of India
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 National Research Development Corp UK, National Research Development Corp of India filed Critical National Research Development Corp UK
Priority to GB4721574A priority Critical patent/GB1523595A/en
Publication of GB1523595A publication Critical patent/GB1523595A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/029—Furnaces therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces
    • F27D11/02—Ohmic resistance heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/64—Heating elements specially adapted for furnaces using ribbon, rod, or wire heater
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/62—Heating means for drawing
    • C03B2205/63—Ohmic resistance heaters, e.g. carbon or graphite resistance heaters
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/82—Means for sealing the fibre exit or lower end of the furnace
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/90—Manipulating the gas flow through the furnace other than by use of upper or lower seals, e.g. by modification of the core tube shape or by using baffles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Resistance Heating (AREA)
  • Furnace Details (AREA)

Abstract

1523595 Optical fibres NATIONAL RESEARCH DEVELOPMENT CORP 31 Oct 1975 [31 Oct 1974] 47215/74 Heading C1M [Also in Division H5] An electric resistance furnace for drawing optical quality quartz or glass fibres in an inert atmosphere has a meander form resistance heating element 1 formed at one end of a cylindrical graphite shell 2 by two series of interdigitated longitudinal slots, 3, 4, extending respectively from one edge 5 of the shell 2 and from lateral slots 6 in the shell 2, further longitudinal slots 7 extending from the lateral slots 6 to the other edge 8 of shell 2 to provide current supply paths to the element 3. Current thus flows through the heating element in two or more parallel paths. The shell is suspended vertically within the furnace by flange 10 through ceramic insulator 11 from a top wall 18 of the furnace. Graphite sleeve 27 surrounding and spaced from the element provides a heat shield. The interior of the furnace is filled with thermally insulating graphite felt. A thermocouple or aperture in the' shield 27 is provided for temperature measurement. Inlet assembly at the top comprises an iris diaphragm 25 biased to engage a silica or hard glass rod feedstock rod, an inlet passage 23, a circumferential and inwardly and downwardly inclined inert gas inlet passage between surfaces 24, 20. Outlet assembly at the bottom comprises an iris diaphragm 36 (not biased), a circumferential inwardly and upwardly inclined inert gas inlet passage, a fibre outlet passage 34 and an inert gas outlet 30, 31, 32. Thin walled graphite shell 28 guides the inert gas upwards towards the element and defines with shield 27 an inert gas outlet passage. The glass or silica passages through the apparatus are all of the same diameter.
GB4721574A 1975-10-31 1975-10-31 Electrical resistance furnaces Expired GB1523595A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4721574A GB1523595A (en) 1975-10-31 1975-10-31 Electrical resistance furnaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4721574A GB1523595A (en) 1975-10-31 1975-10-31 Electrical resistance furnaces

Publications (1)

Publication Number Publication Date
GB1523595A true GB1523595A (en) 1978-09-06

Family

ID=10444174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4721574A Expired GB1523595A (en) 1975-10-31 1975-10-31 Electrical resistance furnaces

Country Status (1)

Country Link
GB (1) GB1523595A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2512804A1 (en) * 1981-09-16 1983-03-18 Western Electric Co METHOD AND APPARATUS FOR HEATING A PREFORM FOR OPTICAL FIBER
EP0105563A1 (en) * 1982-10-04 1984-04-18 Koninklijke Philips Electronics N.V. Apparatus for drawing an optical fibre from a solid preform made of SiO2 and doped SiO2
FR2563826A1 (en) * 1984-05-07 1985-11-08 Verre Fluore Sa METHODS OF MANUFACTURING FIBERS AND OPTICAL COMPONENTS IN FLUOROUS GLASSES AND APPARATUSES FOR IMPLEMENTING THE SAME
US4555257A (en) * 1983-09-03 1985-11-26 Standard Telephones And Cables Public Limited Company Optical fibre pulling tower
EP0255729A1 (en) * 1986-08-07 1988-02-10 Sumitomo Electric Industries Limited Heating apparatus for drawing glass rod
EP0370001A1 (en) * 1987-06-26 1990-05-30 Incom Inc Glass drawing process and furnace.
EP0228082B1 (en) * 1985-12-27 1990-10-03 Sumitomo Electric Industries Limited Method of making optical glass article
US5236483A (en) * 1985-07-16 1993-08-17 Seiko Epson Corporation Method of preparing silica glass
EP0567961A1 (en) * 1992-05-01 1993-11-03 Corning Incorporated Method and apparatus for drawing optical fibers
FR2695716A1 (en) * 1992-03-05 1994-03-18 Ridehammer Gmbh Co Kg Heating tube for industrial oven, industrial oven and method of heating the oven.
EP0795519A1 (en) * 1996-03-14 1997-09-17 Alcatel Fibres Optiques Device for injecting non-oxidising gas inside a furnace
EP0893416A1 (en) * 1997-07-24 1999-01-27 Alcatel Upper gas-diffuser for an optical fibre drawing apparatus using a preform
US5974838A (en) * 1998-07-07 1999-11-02 Alcatel Optical fiber graphite furnace featuring an automatic shutter door system for feeding an optical preform
US6044663A (en) * 1997-03-27 2000-04-04 Alcatel Impregnated vitreous (glassy) carbon graphite liner and heating element for a fiber optic draw furnace
WO2000050350A1 (en) * 1999-02-26 2000-08-31 Corning Incorporated Method and apparatus for sealing the bottom of a furnace for drawing optical fibre from a preform
WO2000068157A1 (en) * 1999-05-10 2000-11-16 Pirelli Cavi E Sistemi S.P.A. Method and induction furnace for drawing large diameter preforms to optical fibres
US6354113B2 (en) 1999-01-20 2002-03-12 Alcatel Fiber optic draw furnace featuring a fiber optic preform heating and fiber drawing programmable logic controller
US20180251393A1 (en) * 2017-03-01 2018-09-06 Shin-Etsu Chemical Co., Ltd. Wire-drawing optical fiber base material manufacturing method and manufacturing apparatus

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2512804A1 (en) * 1981-09-16 1983-03-18 Western Electric Co METHOD AND APPARATUS FOR HEATING A PREFORM FOR OPTICAL FIBER
EP0105563A1 (en) * 1982-10-04 1984-04-18 Koninklijke Philips Electronics N.V. Apparatus for drawing an optical fibre from a solid preform made of SiO2 and doped SiO2
US4555257A (en) * 1983-09-03 1985-11-26 Standard Telephones And Cables Public Limited Company Optical fibre pulling tower
FR2563826A1 (en) * 1984-05-07 1985-11-08 Verre Fluore Sa METHODS OF MANUFACTURING FIBERS AND OPTICAL COMPONENTS IN FLUOROUS GLASSES AND APPARATUSES FOR IMPLEMENTING THE SAME
EP0161999A1 (en) * 1984-05-07 1985-11-21 Le verre fluoré S.A. Methods for making fibres and optical components in fluor glass and apparatus used therefor
US5236483A (en) * 1985-07-16 1993-08-17 Seiko Epson Corporation Method of preparing silica glass
EP0228082B1 (en) * 1985-12-27 1990-10-03 Sumitomo Electric Industries Limited Method of making optical glass article
US4750927A (en) * 1986-08-07 1988-06-14 Sumitomo Electric Industries, Ltd. Heating apparatus for drawing glass rod
EP0255729A1 (en) * 1986-08-07 1988-02-10 Sumitomo Electric Industries Limited Heating apparatus for drawing glass rod
EP0370001A1 (en) * 1987-06-26 1990-05-30 Incom Inc Glass drawing process and furnace.
EP0370001A4 (en) * 1987-06-26 1990-10-10 Incom, Inc. Glass drawing process and furnace
FR2695716A1 (en) * 1992-03-05 1994-03-18 Ridehammer Gmbh Co Kg Heating tube for industrial oven, industrial oven and method of heating the oven.
ES2065840A2 (en) * 1992-03-05 1995-02-16 Riedhammer Gmbh Co Kg Resistance heating pipe for an electric industrial furnace
EP0567961A1 (en) * 1992-05-01 1993-11-03 Corning Incorporated Method and apparatus for drawing optical fibers
EP0795519A1 (en) * 1996-03-14 1997-09-17 Alcatel Fibres Optiques Device for injecting non-oxidising gas inside a furnace
US5970083A (en) * 1996-03-14 1999-10-19 Alcatel Fibres Optiques Device for injecting non-oxidizing gas into a furnace
FR2746176A1 (en) * 1996-03-14 1997-09-19 Alcatel Fibres Optiques NON-OXIDIZING GAS INJECTION DEVICE INSIDE AN OVEN
US6044663A (en) * 1997-03-27 2000-04-04 Alcatel Impregnated vitreous (glassy) carbon graphite liner and heating element for a fiber optic draw furnace
US6257023B1 (en) 1997-03-27 2001-07-10 Alcatel Fiber optic draw furnace having a heating element and a furnace shell, featuring rigidified high purity graphite felt insulation therebetween
EP0893416A1 (en) * 1997-07-24 1999-01-27 Alcatel Upper gas-diffuser for an optical fibre drawing apparatus using a preform
FR2766480A1 (en) * 1997-07-24 1999-01-29 Alsthom Cge Alcatel HIGH GAS DIFFUSER IN A FIBER DEVICE OF AN OPTICAL FIBER PREFORM
CN1100012C (en) * 1998-07-07 2003-01-29 阿尔卡塔尔公司 Optical fiber graphite furnace featuring automatic shutter door system for feeding optical preform
EP0970925A1 (en) * 1998-07-07 2000-01-12 Alcatel Access port for an optical fiber draw furnace
US5974838A (en) * 1998-07-07 1999-11-02 Alcatel Optical fiber graphite furnace featuring an automatic shutter door system for feeding an optical preform
US6354113B2 (en) 1999-01-20 2002-03-12 Alcatel Fiber optic draw furnace featuring a fiber optic preform heating and fiber drawing programmable logic controller
WO2000050350A1 (en) * 1999-02-26 2000-08-31 Corning Incorporated Method and apparatus for sealing the bottom of a furnace for drawing optical fibre from a preform
US6244099B1 (en) 1999-02-26 2001-06-12 Corning Incorporated Draw furnace sealing assembly and method
WO2000068157A1 (en) * 1999-05-10 2000-11-16 Pirelli Cavi E Sistemi S.P.A. Method and induction furnace for drawing large diameter preforms to optical fibres
US7814767B2 (en) 1999-05-10 2010-10-19 Prysmian Cavi E Sistemi Energia S.R.L. Method and induction furnace for drawing large diameter preforms to optical fibres
US20180251393A1 (en) * 2017-03-01 2018-09-06 Shin-Etsu Chemical Co., Ltd. Wire-drawing optical fiber base material manufacturing method and manufacturing apparatus
US11384006B2 (en) * 2017-03-01 2022-07-12 Shin-Etsu Chemical Co., Ltd. Wire-drawing optical fiber base material manufacturing method and manufacturing apparatus

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee