JPS58104032A - Furnace for spinning optical fiber - Google Patents

Furnace for spinning optical fiber

Info

Publication number
JPS58104032A
JPS58104032A JP19906881A JP19906881A JPS58104032A JP S58104032 A JPS58104032 A JP S58104032A JP 19906881 A JP19906881 A JP 19906881A JP 19906881 A JP19906881 A JP 19906881A JP S58104032 A JPS58104032 A JP S58104032A
Authority
JP
Japan
Prior art keywords
furnace
optical fiber
main body
gas
jetting
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.)
Pending
Application number
JP19906881A
Other languages
Japanese (ja)
Inventor
Motohiro Nakahara
基博 中原
Masayuki Nishimoto
西本　征幸
Masao Nishimura
西村　真雄
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.)
Furukawa Electric Co Ltd
Nippon Telegraph and Telephone Corp
Original Assignee
Furukawa Electric Co Ltd
Nippon Telegraph and Telephone Corp
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 Furukawa Electric Co Ltd, Nippon Telegraph and Telephone Corp filed Critical Furukawa Electric Co Ltd
Priority to JP19906881A priority Critical patent/JPS58104032A/en
Publication of JPS58104032A publication Critical patent/JPS58104032A/en
Pending 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
    • 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
    • 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

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)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To prepare optical fiber having improved strength with preventing inner dusts from attaching to a preform rod and the optical fiber, by providing the cylindrical inner wall face of the main body of the furnace for spinning optical fiber with a gas jetting pipe having a jetting angle approximately coincident with the tangential direction of the cylindrical wall face. CONSTITUTION:The bottom end of the preform rod 9 is inserted at low speed from the inlet 2 of the main body 1 of a furnace to the interior 1 of the main body of a furnace in high-temperature state, the bottom end melted under heating is drawn at high speed to give the optical fiber 10, which is introduced from the outlet 3 to a coating process, etc., out of the main body 1. In the operation, the inlet 2 is sealed with the sealing medium 8, and a pure inert gas such as N2, Ar, etc. is jetted from the gas jetting pipes 6a, 6b and 6c to the main body 1. The direction of the jetting flow of the gas is coincident with the tangential direction of the inner face 5, so inner dusts produced in the main body 1 are moved to the side of the inner face 5 by centrifugal force, discharged from the opening 7 out of the furnace, and not attached to the rod 9 and the fiber 10.

Description

【発明の詳細な説明】 本発明は光フアイバ紡糸用加熱炉の改良に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in heating furnaces for spinning optical fibers.

既知の通シ、光ファイバは石英糸などのプリフォームロ
ッドを紡糸工程にかけることにより得られ、この際の紡
糸工程では上記プリフォームロッドの一端を加熱炉内へ
低速で挿入し、これにより溶融された該一端を高速で延
伸することによシ所望繊維径の光ファイバを得ている。Conventionally, optical fibers are obtained by subjecting a preform rod such as quartz thread to a spinning process.In the spinning process, one end of the preform rod is inserted into a heating furnace at a low speed, thereby melting it. By drawing this one end at high speed, an optical fiber having a desired fiber diameter is obtained.

ところで、上記のごとく光ファイバを製造する際、加熱
炉内め雰囲気を清浄に保持することが重要で壺シ、この
対策が充分でないとつぎの上うな問題が起きる′０ つま−り炉内に外部からの塵埃等が侵入し、これがプリ
フォームロッドの表面に付着するといつな事態が生じを
場合、得べき光ファイバの強度が極端に低下することに
なる。By the way, when manufacturing optical fibers as mentioned above, it is important to keep the atmosphere inside the heating furnace clean, and if this measure is not taken sufficiently, the following problems will occur. If dust or the like enters from the outside and adheres to the surface of the preform rod, the strength of the optical fiber that should be obtained will be extremely reduced.

従来ではこのような問題に対処するため、加熱炉内へ清
浄な不活性ガスを吹きこむことにょ９、同炉内をこのガ
スで置換しておシ、したがって外部から侵“入する夾雑
物の問題はこの手段で一応解決できたが、２０００’Ｏ
近く、またはそれ以上もの高温状態をつくり出す上記加
熱炉にあっては、炉の構成部材が高温のために揮発しな
シ昇早し、これが凝固することにょシ内部塵埃が発生し
て腟た。Conventionally, in order to deal with this problem, clean inert gas was blown into the heating furnace.9 The inside of the furnace was replaced with this gas, and therefore the foreign matter that entered from the outside was removed. I was able to solve the problem with this method, but 2000'O
In the above-mentioned heating furnace, which creates a high temperature state close to or higher than that, the constituent members of the furnace do not volatilize due to the high temperature and rise quickly, which solidifies and generates internal dust.

そしてこの内部塵埃が上記ガス流を介してプリフォーム
ロッドに付着するため、従来例の場合では外部塵埃に対
処できても内部塵埃の問題には対処できなかった。Since this internal dust adheres to the preform rod via the gas flow, in the case of the conventional example, even if external dust can be dealt with, the problem of internal dust cannot be dealt with.

本発明は上記加熱炉における内部塵埃の問題に鑑み、同
炉へのガス吹きこみ構造を改良してその内部塵埃がプリ
フォームロッドに付着することのないようにしたもので
、以下その具体的実施例を図と共に説明する。In view of the problem of internal dust in the heating furnace, the present invention improves the gas blowing structure to the furnace so that the internal dust does not adhere to the preform rod. An example will be explained with figures.

第１図〜第３図において、（１）は上位の入口（２）、
下位の出口（３）を有する耐゛熱性の炉本体で１）、こ
の炉本体（１）内には、：’１４的な加熱手段を備えた
円筒状の発熱体（４）が縦型として内装されていると共
に該発熱体（４）の内周面が炉の内壁面（５）となって
いる。In Figures 1 to 3, (1) is the upper entrance (2),
A heat-resistant furnace body 1) with a lower outlet (3), in which a vertical cylindrical heating element (4) equipped with heating means is installed. The inner peripheral surface of the heating element (4) serves as the inner wall surface (5) of the furnace.

上記炉本体（１）には、該本体（１）および発熱体（４
）をその外部から内部へと貫通する複数（単一でもよい
ンのガス吹出管（６）ａ　、　（６１ｂ　、（６）　ｃ
が上段、中段、下段のように配設されておフ、これらガ
ス吹出管（６１ａ　１．（６）　ｂ　５（６）Ｃは第２
図のごとく内壁面（５）の接線方向と略一致する噴射角
を有している。The furnace main body (1) includes the main body (1) and a heating element (4
) from the outside to the inside of the gas blowing pipe (6) a, (61b, (6) c
are arranged in the upper, middle, and lower stages, and these gas blow-off pipes (61a 1. (6) b 5 (6) C are the second
As shown in the figure, it has a spray angle that substantially coincides with the tangential direction of the inner wall surface (5).

さらに炉本体（１１の平型とした底部には前述した出口
（３）の他、ガス排出用とした開口部（７）が設けられ
ている。Further, the flat bottom of the furnace body (11) is provided with an opening (7) for gas discharge in addition to the aforementioned outlet (3).

なお、出口（３）は第４図のごとき先細形状としてもよ
く、この場合、該出口（３）が開口部（７）を兼用する
ことになる。Note that the outlet (3) may have a tapered shape as shown in FIG. 4, and in this case, the outlet (3) also serves as the opening (7).

図中、（８）は入口（２）のシール材、（９）はグリフ
オームロッド、αＱは晃ファイバである。In the figure, (8) is a sealing material for the inlet (2), (9) is a glyphroam rod, and αQ is an optical fiber.

［・１・ 本発明が上記の実施例からなる場合、図示し−，１１ ない昇降手段にょルプリフォームロッド（９）を保持し
、その下端を入口（２）から高温状態の炉本体（１）へ
低速で挿入すると共に該炉本体（υ内で加熱溶融された
ロッド下端を高速で延伸することによシ光ファイバＯＩ
とし、以下出口（３）から炉本体（１）外へ出た光ファ
イバａ１を被覆工程等へ案内するが、この際の紡糸時、
炉本体（１）の入口（２）はシール材（８）でシールし
ておき、かつ、炉本体（１）内には各ガス吹出管（６Ｊ
　ａ　、ｆ６）　ｂ　ｓ　１６１　ｃよりＮ２、Ａ　ｒ
　ｓ’　Ｈｅなど−の清浄な不活性ガスを噴射する。[・1. When the present invention consists of the above embodiment, the lifting means (not shown) holds the preform rod (9), and its lower end is connected to the furnace body (1) in a high temperature state from the inlet (2). The optical fiber OI
The optical fiber a1 exiting from the outlet (3) to the outside of the furnace body (1) is guided to a coating process, etc., but during spinning at this time,
The inlet (2) of the furnace body (1) is sealed with a sealing material (8), and each gas blow-off pipe (6J
a, f6) b s 161 From c, N2, A r
Inject clean inert gas such as He.

こうして炉本体（１）内に清浄なガスを吹きこんだ場合
、上記ガス吹出管ｆ６）　ａ　ｓ　ｆ６）　ｂ　ｓ　（
６）　ｃによるガス噴射方向が内壁面（５）の接線方向
と一致しているのでガス流はその内壁面（５）へ強制的
に沿わされると共に渦流状態を呈するようになる。When clean gas is blown into the furnace body (1) in this way, the gas blowing pipe f6) a s f6) b s (
6) Since the direction of gas injection by c coincides with the tangential direction of the inner wall surface (5), the gas flow is forced to follow the inner wall surface (5) and exhibits a vortex state.

し念がって炉本体（１）内で発生した内部塵埃はこのガ
ス渦流により遠心力を付与されながら内壁面（５）側へ
寄せられることとなシ、かつ、ガスの排気流、自重等に
よシ内壁面を落動しながら開口部（７）よ〕炉本体（υ
外へ排出される。In order to ensure that the internal dust generated in the furnace body (1) is not attracted to the inner wall surface (5) side while being given centrifugal force by this gas vortex flow, the dust generated in the furnace body (1) is not affected by the gas exhaust flow, its own weight, etc. The furnace body (υ
Expelled outside.

この結果、炉本体（１）内で発生した内部塵埃が炉内中
心のプリフォーム９ツド（９）へ付ｉするといったこと
はなくなシ、また、炉本体ｆｌ）内はガスが吹きこまれ
た分だけ外部よりも圧力が高くなりているので外部塵埃
が侵入するといったことも併せて防止できる。As a result, internal dust generated in the furnace body (1) will not be attached to the preform 9 (9) at the center of the furnace, and gas will not be blown into the furnace body (fl). Since the pressure is higher than that of the outside, it is also possible to prevent external dust from entering.

なお、１４図のよりに出口（３）が開口部（７）をも兼
ねているとき、前記のようにして排出される内部塵埃は
この出口（３）を通過することになシ、ここで光ファイ
バＱ（Ｉと接触するよりな事態も生じるが、この出口（
３）における光ファイバＱｌはかな多温度が低下してい
て凝固状態となっているから、内部塵埃が光ファイバ（
１（Ｉに付着するといったことはない。Note that when the outlet (3) also serves as the opening (7) as shown in Figure 14, the internal dust discharged as described above will not pass through this outlet (3). A situation other than contacting the optical fiber Q (I) may occur, but this exit (
Since the optical fiber Ql in 3) has a low temperature and is in a solidified state, the internal dust may not reach the optical fiber (
1 (There is no such thing as adhering to I.

具体例 第１図〜第３図の加熱炉において外径１５゜のグリフオ
ームロッド（９）を外径１２５μｍの光ファイバ０１に
紡糸した際、炉内温度を２１００’Ｏ。Specific Example When spinning the Glyform rod (9) with an outer diameter of 15 degrees into an optical fiber 01 with an outer diameter of 125 μm in the heating furnace of FIGS. 1 to 3, the temperature inside the furnace was 2100'O.

ガス吹出管（６）　ａ　ｓ　（６１ｂ　−（６）　ｃの
ガス供給量を４Ｌ／ｍｓ　　３１／ｍｓ　３　ｔ／ｍｓ
各ガス原ガス流速０　ｍ／　ｓｅｃ　　とした０ こうして得られた光ファイバ員を、標点間距離”１０　
ｆｎｓ引張速度５０（１ｍ／ｓｉの条件で測定したとこ
ろ、その平均強度は５３’ＱＫｐ／−と高い値を示した
。Gas supply amount of gas blowing pipe (6) a s (61b - (6) c is 4L/ms 31/ms 3 t/ms
The flow rate of each gas source gas was set to 0 m/sec. The optical fiber members obtained in this way were
When measured at a fns tensile speed of 50 (1 m/si), the average strength showed a high value of 53'QKp/-.

因みに従来例ではその平均強度が４５０Ｋｇ／１ｎｙＡ
にとどまっている０ 以上説明した通り、本発明の加熱炉では外部塵埃の問題
だけでなく内部塵埃の問題も解消でき、強度面で優れた
光ファイバが製造できることとなる０By the way, in the conventional example, the average strength is 450Kg/1nyA
As explained above, the heating furnace of the present invention can solve not only the problem of external dust but also the problem of internal dust, making it possible to manufacture optical fibers with excellent strength.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明加熱炉の１実施例を示した縦断面図、第
２図は第１図１−１線の断面図、第３図は第１図１−１
線の断面図、第４図は本発明加熱炉の他実施例を示す要
部縦断面図である０（１）・・・・・炉本体 （２）・・・・・入口 （３）・・・・・出口 （４）・・・・・発熱体 （５）・・・・・内壁面 （６）　ａ　ｓ　１６１　ｂ　１（６）　ｃ・・・・・
ガス吹出管（８）・・・φ・シール材 （９）・−−９・プリフォームロッド αＩ０■・光ファイバ 第１図 ｂ □□イ（ 第　３　図 竿　４　図Fig. 1 is a longitudinal sectional view showing one embodiment of the heating furnace of the present invention, Fig. 2 is a sectional view taken along line 1-1 in Fig. 1, and Fig. 3 is a sectional view taken along line 1-1 in Fig. 1.
Fig. 4 is a longitudinal sectional view of main parts showing another embodiment of the heating furnace of the present invention. ...Outlet (4) ...Heating element (5) ...Inner wall surface (6) a s 161 b 1 (6) c ...
Gas blow-off pipe (8)...φ・Sealing material (9)・--9・Preform rod αI0■・Optical fiber Fig. 1b □□A (Fig. 3 Rod 4 Fig.

Claims (1)

【特許請求の範囲】 ０）　プリ２オームロツＦの端部を加熱溶融状態とし、
かつ、延伸することによシ、該ロッドを光ファイバに加
工する際の光７アイパ紡糸用加熱炉において、炉本体は
その一端および他端に入口、川口を有し、該炉本体の円
筒状内壁面には、その接線方向と略一致した噴射角をも
つガス吹出管が１つまたは２つ以上配設されていること
を特徴とした光フアイバ紡糸用加熱炉。 （２）炉本体の内壁面は発熱体によ多形成されている特
許請求の範囲第１項記載の光フアイバ紡糸用加熱炉。 （３）　　炉本体の出口は先ｌＩＲ形状を有している特
許請求の範８第１項記載の光フアイバ紡糸用加熱炉。[Scope of Claims] 0) Heat and melt the end of the pre-2 Ohmrotsu F,
In the Hikari 7 IPA spinning heating furnace used to process the rod into an optical fiber by stretching, the furnace body has an inlet and a mouth at one end and the other end, and the cylindrical shape of the furnace body 1. A heating furnace for optical fiber spinning, characterized in that one or more gas blowing pipes having an injection angle that substantially coincides with the tangential direction of the inner wall surface are disposed on the inner wall surface. (2) The heating furnace for optical fiber spinning according to claim 1, wherein the inner wall surface of the furnace body is multi-layered with a heating element. (3) The heating furnace for optical fiber spinning according to claim 8, wherein the outlet of the furnace body has a tip-IR shape.
JP19906881A 1981-12-10 1981-12-10 Furnace for spinning optical fiber Pending JPS58104032A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19906881A JPS58104032A (en) 1981-12-10 1981-12-10 Furnace for spinning optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19906881A JPS58104032A (en) 1981-12-10 1981-12-10 Furnace for spinning optical fiber

Publications (1)

Publication Number Publication Date
JPS58104032A true JPS58104032A (en) 1983-06-21

Family

ID=16401569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19906881A Pending JPS58104032A (en) 1981-12-10 1981-12-10 Furnace for spinning optical fiber

Country Status (1)

Country Link
JP (1) JPS58104032A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329898A2 (en) * 1988-02-24 1989-08-30 Sumitomo Electric Industries Limited Fiber drawing furnace
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
NL1013583C2 (en) * 1999-11-16 2001-05-17 Plasma Optical Fibre Bv Apparatus and method for drawing optical fibers from a preform.
KR100755132B1 (en) 2006-02-13 2007-09-04 엘에스전선 주식회사 Furnace for manufacturing optical fiber preform and method thereof
JP2017171549A (en) * 2016-03-25 2017-09-28 信越化学工業株式会社 Optical fiber preform contraction processing method, and processing device
CN108529870A (en) * 2017-03-01 2018-09-14 信越化学工业株式会社 The manufacturing method and manufacturing device of wire drawing optical fiber base material
JP2021517545A (en) * 2018-03-13 2021-07-26 コーニング インコーポレイテッド Gas regeneration method and equipment for fiber-drawing furnace

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329898A2 (en) * 1988-02-24 1989-08-30 Sumitomo Electric Industries Limited Fiber drawing furnace
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
NL1013583C2 (en) * 1999-11-16 2001-05-17 Plasma Optical Fibre Bv Apparatus and method for drawing optical fibers from a preform.
EP1101745A1 (en) * 1999-11-16 2001-05-23 Plasma Optical Fibre B.V. Device and method for drawing optical fibres from a preform
US6474109B1 (en) 1999-11-16 2002-11-05 Plasma Optical Fibre, B.V. Device and method for drawing optical fibers from a preform
KR100755132B1 (en) 2006-02-13 2007-09-04 엘에스전선 주식회사 Furnace for manufacturing optical fiber preform and method thereof
JP2017171549A (en) * 2016-03-25 2017-09-28 信越化学工業株式会社 Optical fiber preform contraction processing method, and processing device
CN108529870A (en) * 2017-03-01 2018-09-14 信越化学工业株式会社 The manufacturing method and manufacturing device of wire drawing optical fiber base material
US11384006B2 (en) 2017-03-01 2022-07-12 Shin-Etsu Chemical Co., Ltd. Wire-drawing optical fiber base material manufacturing method and manufacturing apparatus
CN108529870B (en) * 2017-03-01 2022-10-21 信越化学工业株式会社 Method and apparatus for manufacturing optical fiber base material for drawing
JP2021517545A (en) * 2018-03-13 2021-07-26 コーニング インコーポレイテッド Gas regeneration method and equipment for fiber-drawing furnace

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