DK1181255T3 - Fremgangsmåde og induktionsovn til trækning af præforme med stor diameter til optiske fibre - Google Patents

Fremgangsmåde og induktionsovn til trækning af præforme med stor diameter til optiske fibre

Info

Publication number
DK1181255T3
DK1181255T3 DK00936723T DK00936723T DK1181255T3 DK 1181255 T3 DK1181255 T3 DK 1181255T3 DK 00936723 T DK00936723 T DK 00936723T DK 00936723 T DK00936723 T DK 00936723T DK 1181255 T3 DK1181255 T3 DK 1181255T3
Authority
DK
Denmark
Prior art keywords
furnace
chimney
large diameter
induction furnace
drawing large
Prior art date
Application number
DK00936723T
Other languages
Danish (da)
English (en)
Inventor
Giacomo Stefano Roba
Massimo Nutini
Franco Veronelli
Original Assignee
Pirelli & C Spa
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 Pirelli & C Spa filed Critical Pirelli & C Spa
Application granted granted Critical
Publication of DK1181255T3 publication Critical patent/DK1181255T3/da

Links

Classifications

    • 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
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/16—Furnaces having endless cores
    • H05B6/20—Furnaces having endless cores having melting channel only
    • 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
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
    • C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
    • 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
    • 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
    • C03B2205/64—Induction furnaces, i.e. HF/RF coil, e.g. of the graphite or zirconia susceptor type
    • 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
    • C03B2205/70—Draw furnace insulation
    • 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
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace
    • C03B2205/81—Means for sealing the preform entry or upper end of the furnace using gas
    • 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
    • C03B2205/92—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 using means for gradually reducing the cross-section towards the outlet or around the preform draw end, e.g. tapered
    • 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
    • C03B2205/96—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 using tangential feed approximately perpendicular to the draw axis
    • 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
    • C03B2205/98—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 using annular gas inlet distributors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
DK00936723T 1999-05-10 2000-05-09 Fremgangsmåde og induktionsovn til trækning af præforme med stor diameter til optiske fibre DK1181255T3 (da)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP99109154 1999-05-10
US13406699P 1999-05-13 1999-05-13
PCT/EP2000/004134 WO2000068157A1 (en) 1999-05-10 2000-05-09 Method and induction furnace for drawing large diameter preforms to optical fibres

Publications (1)

Publication Number Publication Date
DK1181255T3 true DK1181255T3 (da) 2005-12-12

Family

ID=8238141

Family Applications (1)

Application Number Title Priority Date Filing Date
DK00936723T DK1181255T3 (da) 1999-05-10 2000-05-09 Fremgangsmåde og induktionsovn til trækning af præforme med stor diameter til optiske fibre

Country Status (10)

Country Link
US (1) US7814767B2 (zh)
EP (1) EP1181255B1 (zh)
CN (1) CN1207226C (zh)
AT (1) ATE301621T1 (zh)
AU (1) AU5211900A (zh)
BR (1) BR0010441A (zh)
CA (1) CA2370494C (zh)
DE (1) DE60021877T2 (zh)
DK (1) DK1181255T3 (zh)
WO (1) WO2000068157A1 (zh)

Families Citing this family (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6842447B1 (en) 1999-06-14 2005-01-11 Mci, Inc. Internet protocol transport of PSTN-to-PSTN telephony services
US6434143B1 (en) 1999-11-08 2002-08-13 Mci Worldcom, Inc. Internet protocol telephony voice/video message deposit and retrieval
US8743892B2 (en) 1999-11-08 2014-06-03 Verizon Business Global Llc Method and system for dynamic gateway selection in an IP telephony network
US6480588B1 (en) 1999-11-08 2002-11-12 Worldcom, Inc. Methods for providing prepaid telephony service via an internet protocol network system
US9281996B1 (en) 1999-11-08 2016-03-08 Verizon Patent And Licensing Inc. Method and system for dynamic gateway selection in an IP telephony network
KR100393612B1 (ko) * 2001-01-29 2003-08-02 삼성전자주식회사 비접촉식으로 광섬유 편광모드분산 제어를 위한 광섬유인출 장치
KR100545814B1 (ko) * 2002-08-31 2006-01-24 엘에스전선 주식회사 광섬유 인선 용해로 및 이를 이용한 광섬유 인선방법
FI116524B (fi) * 2003-06-13 2005-12-15 Photonium Oy Kuidunvetouunin kuumennuselementin eristys
US20050066689A1 (en) * 2003-09-25 2005-03-31 Wolfgang Eis Device and method for producing glass fibers
JP2005104756A (ja) * 2003-09-29 2005-04-21 Sumitomo Electric Ind Ltd 光ファイバ製造方法及び装置
JP2005272234A (ja) * 2004-03-25 2005-10-06 Shin Etsu Chem Co Ltd 光ファイバ用ガラス母材の加工方法及び加工装置
DE102004043206B4 (de) * 2004-09-03 2007-11-15 Schott Ag Verfahren und Vorrichtung zur Herstellung von polygonförmigen Glaselementen
US20080035682A1 (en) * 2006-08-10 2008-02-14 Calvin Thomas Coffey Apparatus for particle synthesis
JP5603024B2 (ja) * 2009-01-20 2014-10-08 古河電気工業株式会社 光ファイバ母材の製造方法
JP5541775B2 (ja) * 2009-12-03 2014-07-09 信越化学工業株式会社 ガラス母材延伸装置
CN101786619B (zh) * 2010-02-10 2012-03-28 黎应和 竖式高温连续石墨化炉
CN101888723B (zh) * 2010-03-24 2012-10-03 十堰坤泰工贸有限公司 感应透热温度控制方法及其温控系统
CN102225835B (zh) * 2011-04-02 2013-01-23 长飞光纤光缆有限公司 用于光纤预制棒熔缩炉的工艺气体分配环
CN102249534B (zh) * 2011-05-31 2013-09-18 长飞光纤光缆有限公司 大直径光纤预制棒感应拉丝炉加温装置
FI125020B (fi) 2012-05-14 2015-04-30 Nextrom Oy Laitteisto
CN102706725B (zh) * 2012-05-17 2014-07-02 北京航空航天大学 一种非密闭空间石墨加热系统及其加热方法
US9701560B2 (en) * 2012-08-01 2017-07-11 Corning Incorporated Muffle gap seal for glass laminate machine
CN103176240B (zh) * 2012-12-28 2015-10-28 清华大学 用于光纤的冷却装置
US10308544B2 (en) * 2015-10-13 2019-06-04 Corning Incorporated Gas reclamation system for optical fiber production
JP2017171549A (ja) * 2016-03-25 2017-09-28 信越化学工業株式会社 光ファイバプリフォームの絞り加工方法及び加工装置
CN106746592B (zh) * 2016-12-16 2023-03-28 青海中利光纤技术有限公司 光纤拉丝炉的水冷气封装置
CN106517763B (zh) * 2016-12-28 2023-12-01 中国建筑材料科学研究总院 拉丝炉
JP6691881B2 (ja) 2017-03-01 2020-05-13 信越化学工業株式会社 線引き用光ファイバ母材の製造方法および製造装置
US11440830B2 (en) * 2017-04-28 2022-09-13 Corning Incorporated Edge directors including an interior heating device
US11434163B2 (en) 2017-12-20 2022-09-06 Heraeus Quartz North America Llc Variable diameter seal for optical preform furnace
CN108164125B (zh) * 2018-03-02 2023-05-09 中建材衢州金格兰石英有限公司 一种石英加工的打砣设备及其打砣方法
CN110272202B (zh) * 2018-03-15 2023-03-07 康宁股份有限公司 收窄的马弗炉
NL2021543B1 (en) * 2018-09-03 2020-04-30 Draka Comteq Bv Method, heating device and system for heating an elongate silica cylinder for use in the manufacturing of optical fibers.
IT201900002545A1 (it) * 2019-02-21 2020-08-21 Danieli Automation Spa Induttore e relativo metodo di manutenzione
CN110885183A (zh) * 2019-11-22 2020-03-17 青海中利光纤技术有限公司 一种半开合式光纤降温装置
WO2022076485A1 (en) * 2020-10-05 2022-04-14 Veiga Gabriel Da Induction fluid heater
EP4197977A1 (en) 2021-12-08 2023-06-21 Heraeus Quartz North America LLC Inductive furnace with rotating susceptor for high precision waveguide glass draw
WO2024077341A1 (en) * 2022-10-10 2024-04-18 Ritchie Technology Pty Ltd Method and device for continuous direct recycling of plastic waste

Family Cites Families (58)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3233992A (en) * 1959-05-01 1966-02-08 Gustin Bacon Mfg Co Apparatus for production of fine glass fibers
US3540870A (en) * 1968-05-07 1970-11-17 Us Air Force Apparatus for drawing and coating quartz glass fibers
US3793812A (en) * 1972-05-12 1974-02-26 R Willis In-line multitube centrifugal separator
FR2249847A1 (en) 1973-11-06 1975-05-30 Thomson Csf Glass fibre pulling system - in which glass rod end is heated in resonance cavity of UHF waveguide
GB1498184A (en) * 1974-11-13 1978-01-18 Owens Corning Fiberglass Corp Method and apparatus for forming glass-fibres
GB1523595A (en) * 1975-10-31 1978-09-06 Nat Res Dev Electrical resistance furnaces
FR2339148A1 (fr) 1976-01-22 1977-08-19 Comp Generale Electricite Four electrique a haute frequence
FR2340519A1 (fr) * 1976-02-06 1977-09-02 France Etat Four pour tres hautes temperatures
US4142036A (en) * 1976-06-01 1979-02-27 Standard Oil Company (Indiana) Polyphenylcarboxylic acid adamantane compounds and polymers prepared therefrom
US4030901A (en) * 1976-07-19 1977-06-21 Bell Telephone Laboratories, Incorporated Method for drawing fibers
FR2368677A2 (fr) * 1976-10-19 1978-05-19 France Etat Four pour tres hautes temperatures
JPS5945611B2 (ja) 1976-12-10 1984-11-07 株式会社日立製作所 光フアイバ製造用ノズル
FR2386004B2 (fr) 1977-03-29 1980-05-23 Comp Generale Electricite Four electrique a haute frequence
DE2818550C2 (de) 1977-04-30 1990-03-29 Sumitomo Electric Industries, Ltd., Osaka Vorrichtung zum Ziehen von optischen Fasern
US4154592A (en) * 1978-02-21 1979-05-15 Corning Glass Works Method of drawing optical filaments
US4174462A (en) * 1978-03-30 1979-11-13 Pearce Michael L Induction furnaces for high temperature continuous melting applications
DE3025680A1 (de) 1980-07-07 1982-02-04 Siemens AG, 1000 Berlin und 8000 München Heizkoerper fuer einen hochtemperaturofen
US4400180A (en) * 1980-12-03 1983-08-23 Texaco, Inc. Partial oxidation process
US4452578A (en) * 1981-08-27 1984-06-05 Acheson Industries, Inc. Spray apparatus for metal forming and glassware forming machines
US4400190A (en) * 1981-09-28 1983-08-23 Gte Laboratories Incorporated Graphite element for use in a furnace for drawing optical fiber
JPS58104032A (ja) * 1981-12-10 1983-06-21 Nippon Telegr & Teleph Corp <Ntt> 光フアイバ紡糸用加熱炉
US4608473A (en) * 1982-05-28 1986-08-26 At&T Technologies, Inc. Modified zirconia induction furnace
US4450333A (en) * 1982-05-28 1984-05-22 At&T Technologies, Inc. Zirconia induction furnace
US4565082A (en) * 1982-08-06 1986-01-21 Acheson Industries, Inc. Spray apparatus for metal forming machines
NL8302666A (nl) * 1983-07-27 1985-02-18 Philips Nv Inrichting voor het trekken van een optische vezel.
US4547644A (en) * 1984-02-24 1985-10-15 At&T Technologies, Inc. Apparatus for heating a preform from which lightguide fiber is drawn
US4682475A (en) * 1985-01-24 1987-07-28 King-Seeley Thermos Co. Ice making apparatus
IT1184921B (it) * 1985-03-22 1987-10-28 Cselt Centro Studi Lab Telecom Procedimento per il trattamento su perficiale dell elemento riscaldante di forni per la filatura di fibre ottiche
US4678490A (en) * 1985-10-24 1987-07-07 Owens-Corning Fiberglas Corporation Apparatus for forming fibers
JPS62246837A (ja) * 1986-04-21 1987-10-28 Sumitomo Electric Ind Ltd 光フアイバ用線引き炉
DE3731345A1 (de) 1987-09-18 1989-03-30 Licentia Gmbh Verfahren zur herstellung einer vorform fuer einen lichtwellenleiter
GB2212151B (en) * 1987-11-12 1991-07-17 Stc Plc Contaminant removal in manufacture of optical fibre
JP2590176B2 (ja) 1988-01-29 1997-03-12 住友電気工業株式会社 光ファィバ線引き炉
AU605656B2 (en) 1988-02-24 1991-01-17 Sumitomo Electric Industries, Ltd. Fiber drawing furnace
JP2553633B2 (ja) * 1988-05-19 1996-11-13 住友電気工業株式会社 高温炉の断熱方法
DE3903466A1 (de) * 1989-02-06 1990-08-09 Rheydt Kabelwerk Ag Heizofen fuer die innenbeschichtung von vorformen fuer lichtwellenleiter
DE4006839A1 (de) * 1990-03-05 1991-09-12 Rheydt Kabelwerk Ag Vorrichtung zum abdichten thermisch beanspruchter zylinder
DE4022131A1 (de) * 1990-07-11 1992-01-16 Kabelmetal Electro Gmbh Verfahren und vorrichtung zum ziehen einer optischen faser aus einer festen vorform
JP2807335B2 (ja) * 1990-11-13 1998-10-08 古河電気工業株式会社 光ファイバ冷却装置
CA2083858C (en) * 1992-01-30 1997-10-14 James William Fleming, Jr. Iridium fiber draw induction furnace
US5410567A (en) * 1992-03-05 1995-04-25 Corning Incorporated Optical fiber draw furnace
US5284499A (en) * 1992-05-01 1994-02-08 Corning Incorporated Method and apparatus for drawing optical fibers
JPH06239639A (ja) * 1993-02-17 1994-08-30 Furukawa Electric Co Ltd:The 光ファイバガラス母材の延伸方法
US5637130A (en) * 1993-07-13 1997-06-10 Sumitomo Electric Industries, Inc. Method and furnace for drawing optical fibers
DE4339077C2 (de) * 1993-11-16 1997-03-06 Rheydt Kabelwerk Ag Verfahren zum Ziehen einer optischen Faser und Vorrichtung zu dessen Durchführung
JPH0891862A (ja) * 1994-09-29 1996-04-09 Sumitomo Electric Ind Ltd 光ファイバ線引方法および線引炉
JPH08188440A (ja) * 1995-01-12 1996-07-23 Sumitomo Electric Ind Ltd 光ファイバ線引き炉
EP0743289B1 (en) * 1995-05-18 1999-03-10 AT&T IPM Corp. Zirconia induction furnace having magnesia insulation for drawing glass optical fibers
DE19541266A1 (de) * 1995-11-06 1997-05-07 Bayer Ag Verfahren und Vorrichtung zur Durchführung chemischer Reaktionen mittels eines Mikrostruktur-Lamellenmischers
JPH09142892A (ja) * 1995-11-28 1997-06-03 Furukawa Electric Co Ltd:The 被覆光ファイバの製造装置及び製造方法
FR2746176B1 (fr) * 1996-03-14 1998-04-10 Dispositif d'injection de gaz non oxydant a l'interieur d'un four
FR2747673B1 (fr) * 1996-04-23 1998-05-22 Alcatel Fibres Optiques Dispositif de fibrage d'une preforme de fibre optique
AU744011B2 (en) * 1996-10-25 2002-02-14 Corning Incorporated Apparatus and method for reducing break sources in drawn fibers
DE59602017D1 (de) 1996-12-17 1999-07-01 Cit Alcatel Verfahren und Vorrichtung zum Ziehen einer optischen Faser aus einer Vorform
FR2757846B1 (fr) * 1996-12-30 1999-01-29 Alsthom Cge Alcatel Four de fibrage d'une preforme de fibre optique
DK0867412T3 (da) * 1997-03-27 2001-06-18 Cit Alcatel Termisk isolation til en ovn til trækning af optiske fibre
FR2766480B1 (fr) * 1997-07-24 1999-09-24 Alsthom Cge Alcatel Diffuseur haut de gaz dans un dispositif de fibrage d'une preforme de fibre optique
NL1013583C2 (nl) * 1999-11-16 2001-05-17 Plasma Optical Fibre Bv Inrichting en werkwijze voor het uit een voorvorm trekken van optische vezels.

Also Published As

Publication number Publication date
DE60021877D1 (de) 2005-09-15
EP1181255B1 (en) 2005-08-10
ATE301621T1 (de) 2005-08-15
US20020088253A1 (en) 2002-07-11
US7814767B2 (en) 2010-10-19
DE60021877T2 (de) 2006-06-08
CN1354731A (zh) 2002-06-19
EP1181255A1 (en) 2002-02-27
BR0010441A (pt) 2002-02-13
CN1207226C (zh) 2005-06-22
CA2370494C (en) 2008-11-25
WO2000068157A1 (en) 2000-11-16
AU5211900A (en) 2000-11-21
CA2370494A1 (en) 2000-11-16

Similar Documents

Publication Publication Date Title
DK1181255T3 (da) Fremgangsmåde og induktionsovn til trækning af præforme med stor diameter til optiske fibre
ATE211583T1 (de) Senkrechter ofen
ATE371204T1 (de) Schutzrohr zur verwendung in optischen kabeln mit einfachem und sicherem zugang zu den optischen glasfasern
DK69291A (da) Fremgangsmaade og apparat til forbedring af forbraending og driftsvirkningsgrad i en glassmelteovn
SE0301498L (sv) Koherent strålsystem med enkel ringformig mantel kring lågan
RU2671881C1 (ru) Уплотнительное устройство протяжной печи
FI914789A0 (fi) Glasbraennare, saerskilt foer glassmaeltugnar.
BR9101537A (pt) Injetor de ar preaquecido em forno de cuba
HK1037358A1 (en) Device and method for drawing optical fibres from a preform.
EP1428802A3 (en) Method and furnace for drawing an optical fibre from a preform
FR2558243B1 (fr) Piece de four constituant un passage pour des gaz sortant d&#39;un bruleur et procede d&#39;obtention
DK232188D0 (da) Montagesystem til indbygning af et roergassystem i en kamin
ES2134249T3 (es) Boquilla de colada de metal y procedimientos de fabricacion de dicha boquilla.
ATE350352T1 (de) Versiegelung eines faserziehofens
DK0831067T3 (da) Fremgangsmåde og apparat til levering af en overtrukket glasstrøm
EP0774624A3 (de) Aus mehreren Rohrabschnitten aufgebautes Rauchrohr eines Kamins
DE59104859D1 (de) Fackelbrenner.
KR20050105998A (ko) 내화 세라믹 가스 싱크
SE9702334D0 (sv) Ränninduktor och smältugn innefattande sådan ränninduktor
RU2084542C1 (ru) Дуговая сталеплавильная печь
SE9100877L (sv) Gasbraennare foer lyktor
DE59605346D1 (de) Kaminschalung