JPS60231428A - Method for removing starting quartz tube of preform rod - Google Patents
Method for removing starting quartz tube of preform rodInfo
- Publication number
- JPS60231428A JPS60231428A JP8586784A JP8586784A JPS60231428A JP S60231428 A JPS60231428 A JP S60231428A JP 8586784 A JP8586784 A JP 8586784A JP 8586784 A JP8586784 A JP 8586784A JP S60231428 A JPS60231428 A JP S60231428A
- Authority
- JP
- Japan
- Prior art keywords
- quartz tube
- starting quartz
- rod
- starting
- preform rod
- 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
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 239000010453 quartz Substances 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005253 cladding Methods 0.000 claims description 14
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 claims description 7
- 229960000909 sulfur hexafluoride Drugs 0.000 claims description 7
- 229910018503 SF6 Inorganic materials 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 230000002093 peripheral effect Effects 0.000 abstract description 2
- 229910004074 SiF6 Inorganic materials 0.000 abstract 1
- 230000008016 vaporization Effects 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 description 45
- 239000000835 fiber Substances 0.000 description 13
- 239000007789 gas Substances 0.000 description 10
- 239000002019 doping agent Substances 0.000 description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004016 SiF2 Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- XTKDAFGWCDAMPY-UHFFFAOYSA-N azaperone Chemical compound C1=CC(F)=CC=C1C(=O)CCCN1CCN(C=2N=CC=CC=2)CC1 XTKDAFGWCDAMPY-UHFFFAOYSA-N 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- MGNHOGAVECORPT-UHFFFAOYSA-N difluorosilicon Chemical compound F[Si]F MGNHOGAVECORPT-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052909 inorganic silicate Inorganic materials 0.000 description 1
- 210000000936 intestine Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
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
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/08—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant
- C03B2201/12—Doped silica-based glasses doped with boron or fluorine or other refractive index decreasing dopant doped with fluorine
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Surface Treatment Of Glass (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明は、出発石英管を用いるロッドインチューブ法に
て作成したプリフォームロッドの前記出発石英管を除去
をする方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method for removing a starting quartz tube from a preform rod produced by a rod-in-tube method using a starting quartz tube.
（発明の技術的背景）
従来、出発石英管の内壁周面にＣＶＤ法によりクラッド
層を設けると共に該出発石英管内にコア棒を挿入し、こ
れらを加熱軟化させつつコラプスしてブリフォームロ・
ンドを作成する、ロッドインチューブ法（以下、ＲＴ法
という）が知られてｌ／）る。(Technical Background of the Invention) Conventionally, a cladding layer is provided on the inner wall circumferential surface of a starting quartz tube by the CVD method, a core rod is inserted into the starting quartz tube, and the core rod is heated and softened while collapsing to form a preform rotor.
The rod-in-tube method (hereinafter referred to as the RT method) is known for creating a bond.
ところで、バンドルファイ／へやイメージカ゛イド′を
構成する素線ファイバにおいては、ノ々ラメータの１つ
である明るさの確保が必要であること力）ら、開口数（
ＮＡ）及びコア占有率が大きｌ／Ｘことが要望される。By the way, in the bare fiber that constitutes the bundle fiber/hair image guide, it is necessary to ensure brightness, which is one of the parameters, and the numerical aperture (
NA) and core occupancy are desired to be large l/X.
従って、上述したＲＴ法により得たプリフォームロッド
を／ヘンドルコアイノく等の素線ファイバとして用いる
ためには、出発石英管に形成すべきクラ・ンド層にポロ
ン（Ｂ）の如き低屈折率ドーパントを多量に添加して屈
折率を低下させ、これにより得られる素線ファイバの開
口数を大きくすればよい、また、コア占有率を大きくす
るためには出発石英管を除去し、素線ファイバをコアと
クラッドとのみから形成すればよい。Therefore, in order to use the preform rod obtained by the above-mentioned RT method as a bare fiber such as a quartz tube, it is necessary to add a low refractive index dopant such as poron (B) to the crand layer to be formed in the starting quartz tube. It is sufficient to add a large amount to lower the refractive index and thereby increase the numerical aperture of the resulting bare fiber.Also, in order to increase the core occupation rate, the starting quartz tube is removed and the bare fiber is It may be formed from only the cladding and the cladding.
（背景技術の問題点）
そこで、最近では、ＲＴ法により得たプリフォームロッ
ドをフッ酸水溶液に浸漬し、出発石英管を除去すること
が行われているが、この方法では出発石英管を均一的に
除去することが困難な上に多大な時間を要してしまう欠
点がある０例えば、直径１０ ＋ｍｍ、長さ５００腸■
のプリフォームロッドを出発石英管を除去して直径７鳳
鳳に成形するには約７日間の浸漬が必要である。(Problems in the background art) Therefore, recently, the preform rod obtained by the RT method is immersed in a hydrofluoric acid aqueous solution to remove the starting quartz tube. For example, if the intestine has a diameter of 10 mm and a length of 50 mm, it is difficult to remove it and takes a lot of time.
Approximately 7 days of soaking is required to remove the starting quartz tube and form the preform rod into a 7-diameter preform rod.
また、上記プリフォームロッドの周面を旋盤にて研磨す
ることにより出発石英管を除去することが行われている
が、この方法でもやはり多大な時間を要し、例えば、直
径１０ｗ厘、長さ５００■論のプリフォームロッドの出
発石英管を直径が７Ｈになるまで研磨するのに約４８時
間かかる。そして、この方法においては、クラッド層に
多量の低屈折率ドーパントを添加した場合クラッド層の
熱膨張率がコア部のそれよりも大きくなり、ロッド内に
内部応力が発生するので、研磨時にクラッド層にクラッ
クが生じてしまう他の欠点が免れず、従って、この方法
は低屈折率ドーパントの添加量の少ない、即ち、開口数
の小さい素線ファイバしか得られないプリフォームロッ
ドに適用することができるだけである。In addition, the starting quartz tube is removed by polishing the circumferential surface of the preform rod with a lathe, but this method still requires a large amount of time. It takes approximately 48 hours to polish the starting quartz tube of the 500mm preform rod to a diameter of 7H. In this method, when a large amount of low refractive index dopant is added to the cladding layer, the coefficient of thermal expansion of the cladding layer becomes larger than that of the core part, and internal stress is generated in the rod. This method is only applicable to preform rods with a small amount of low refractive index dopant, that is, only bare fibers with small numerical apertures can be obtained. It is.
更に、上記プリフォームロッドを酸水素バーナーにより
高温に加熱し、出発石英管（Ｓ ｉ Ｏ□）を分解して
気相状態で除去することが行われている。しかし、かか
る方法においては、再現性が良く、しかも加熱すること
からクラッド層にクラックが生じる虞れがない等の長所
を有しているが、やはり出発石英管の除去に時間を要し
、例えば、直径１０ｍｍ、長さ５００腸■のプリフォー
ムロッドを直径７■に成形するのに、７２〜９６時間の
時間を必要とする。そして、酸水素ガスを多量に用いる
ため、非常に不経済でもある。Furthermore, the preform rod is heated to a high temperature with an oxyhydrogen burner to decompose the starting quartz tube (S i O□) and remove it in a gaseous state. However, although this method has advantages such as good reproducibility and no risk of cracks occurring in the cladding layer due to heating, it still takes time to remove the starting quartz tube, and e.g. It takes 72 to 96 hours to mold a preform rod with a diameter of 10 mm and a length of 500 mm to a diameter of 7 mm. Furthermore, since a large amount of oxyhydrogen gas is used, it is very uneconomical.
（発明の目的）
本発明の目的は、短時間で、しかもクラックを生じさせ
ることなく経済的に出発石英管を除去することができる
方法を提供することにある。(Objective of the Invention) An object of the present invention is to provide a method that can economically remove a starting quartz tube in a short time and without causing cracks.
（発明の概要）
本発明は、出発石英管を含むプリフォームロッドを六フ
ッ化イオウ雰囲気中に配設して加熱することにより出発
石英管と六フッ化イ才つを反応させて出発石英管を気相
状態で除去することを特徴とする。(Summary of the Invention) The present invention provides a method for producing a starting quartz tube by placing a preform rod containing a starting quartz tube in an atmosphere of sulfur hexafluoride and heating it to cause a reaction between the starting quartz tube and the sulfur hexafluoride. It is characterized by removing in a gaseous state.
（発明の実施例）
以下、本発明の実施例を図面を参照して詳細に説明する
。(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
先ず、第１図に示すように、外径２５ｍｌ１１、肉厚１
）の出発石英管ｌを用意し、この出発石英管１をガラス
旋盤に取付け、１分間に数十回転の速度で回転させ、同
時にこの出発石英管１にＳｉ０文４ガス及びＢＦ３ガス
、その他の低屈折率ドーノくントを含むガスを導入する
と共に反応用酸素ガスを導入し、出発石英管１の軸方向
に沿って酸水素バーナを移動させ、管ｌの外周を局部的
に連続して加熱した。この加熱によりドーノ々ントを含
む力′ス及び５ｉＣｕａガスと酸素ガスが反応し、Ｓｉ
Ｏ□、Ｂ２Ｏ３Ｆ等から成る酸化物のスートカδ出発石
英′ｆ１の内壁周面に堆積し、かつこの堆積したスート
は移行してきた酸水素ノく−すにて約１２００〜１６０
０℃の高温度で加熱溶融されてガラフ化した。そして、
上述の動作を繰り返すことにより、第１図に示すように
、出発石英管ｌの内壁周面に肉厚が１．５〜２ＩＩｌｆ
ｆｌのクラッド層２が形成された。First, as shown in Fig. 1, an outer diameter of 25 ml11 and a wall thickness of 1
) is prepared, this starting quartz tube 1 is attached to a glass lathe, and rotated at a speed of several tens of revolutions per minute, and at the same time, this starting quartz tube 1 is injected with Si04 gas, BF3 gas, and other A gas containing a low refractive index compound is introduced and oxygen gas for reaction is introduced, and an oxyhydrogen burner is moved along the axial direction of the starting quartz tube 1 to locally and continuously heat the outer periphery of the tube 1. did. Due to this heating, the force gas containing the donotant and the 5iCua gas react with the oxygen gas, and the Si
A soot of oxides consisting of O□, B2O3F, etc. δ is deposited on the inner wall surface of the starting quartz 'f1, and this deposited soot has a concentration of about 1200 to 160
It was heated and melted at a high temperature of 0°C to form a galaf. and,
By repeating the above-mentioned operation, as shown in FIG.
A cladding layer 2 of fl was formed.
次に、この出発石英管ｌ内に直径１０〜１５ｍｍの石英
コア棒３を挿入し、該石英管１の外周を酸水素へ−すに
より更に高温で加熱してコラプスすることにより出発石
英管１（クラ・ンド層２）と石英コア棒３との間隙を漬
し、ブリフォームロ・ンド４（第２図参照）を作成した
。この得られたプリフォームロッド４は１５〜２０ｍｍ
の直径を有し、３００ｆｆｉｍの長さに形成された。Next, a quartz core rod 3 with a diameter of 10 to 15 mm is inserted into the starting quartz tube 1, and the outer periphery of the quartz tube 1 is heated at a higher temperature with oxyhydrogen heat to collapse the starting quartz tube 1. The gap between the crystal layer 2 and the quartz core rod 3 was soaked to create a pre-formed layer 4 (see Figure 2). This obtained preform rod 4 has a diameter of 15 to 20 mm.
It was formed to have a diameter of 300ffim and a length of 300ffim.
このようにして作成したプリフォームロッド４を、出発
石英管ｌを除去すべく、第２図に示すように、加熱炉５
内に配置し、その上端を支持棒６の下端に同軸的に取付
けた。そして、この支持棒６を回転しつつ下動させ、カ
ーボンヒータ７にてプリフォームロッド４（出発石英管
ｌ）の周面を１４００’Ｃ〜１５００℃に加熱しつつ加
熱炉５内にその下部の導入口５ＡからＳＦｓと反応用酸
素ガス０２をキャリアガスであるアルゴンガス（Ａｒ）
を介して導入した。本実施例では、支持棒６を２ｍｍ／
ｍｉｎの速度で下動させ、又ＳＦｓは１交／ｍｉｎ 、
Ａ ｒは１０１ ／ｍｉｎ 、 ０２は２００ ｃｃ
／ｍｉｎの流量でそれぞれ導入した。In order to remove the starting quartz tube l, the preform rod 4 produced in this way was placed in a heating furnace 5, as shown in FIG.
and its upper end was coaxially attached to the lower end of the support rod 6. Then, the support rod 6 is rotated and moved downward, and the lower part of the preform rod 4 (starting quartz tube l) is heated in the heating furnace 5 while the peripheral surface of the preform rod 4 (starting quartz tube l) is heated to 1400'C to 1500C with the carbon heater 7. SFs and reaction oxygen gas 02 are introduced into the inlet 5A of the carrier gas argon gas (Ar).
introduced via. In this embodiment, the support rod 6 is 2 mm/
Move down at a speed of min, and SFs is 1 cycle/min.
Ar is 101/min, 02 is 200 cc
Each was introduced at a flow rate of /min.
このように、ＳＦａ雰囲気中でプリフォームロッドを下
動させつつ加熱すると、最外層の出発石英管ｌがＳＦｓ
と反応し、３時間経過後には出発石英管ｌが除去され、
クラッド層？と石英コア棒３のみから成る直径１３〜１
８ｍｍ、長さ３００ｍｍのプリフォームロフトが得られ
た。即ち、出発石英管１（ＳｉＯ２）とＳＦａとは次の
ように反応し、
３ＳｉＯ□＋２３Ｆｓ→
３ＳｉＦ４ ↑＋２Ｓ０３ ↑ ・ φ ・ ・（１）
ＳｉＦ２とＳＯｘが気相状態で加熱炉５の排気口５Ｂか
ら排気され、これにより、出発石英管ｌが除去された。In this way, when the preform rod is heated while being moved downward in the SFa atmosphere, the starting quartz tube l in the outermost layer becomes SFs.
After 3 hours, the starting quartz tube was removed,
Clad layer? and quartz core rod 3 with a diameter of 13 to 1.
A preform loft of 8 mm and a length of 300 mm was obtained. That is, the starting quartz tube 1 (SiO2) and SFa react as follows, 3SiO□+23Fs→ 3SiF4 ↑+2S03 ↑ ・φ ・ ・(1)
SiF2 and SOx were exhausted in a gaseous state from the exhaust port 5B of the heating furnace 5, thereby removing the starting quartz tube 1.
また、プリフォームロッド４周面を加熱しつつ出発石英
管ｌを除去すると、クラッド層２がその熱により軟化す
るので、クラッド層２にクラックが生じることもなかっ
た。Further, when the starting quartz tube 1 was removed while heating the circumferential surface of the preform rod 4, the cladding layer 2 was softened by the heat, so no cracks were generated in the cladding layer 2.
この得られたプリフォームロッドを紡糸して外径１０μ
ｍの素線ファイバを作成したところ、第３図に示すよう
に、コア径が７μｍ、クラッド厚が１．５１ｔｍの素線
ファイバが得られ、そのコア占有率は４９％であった。This obtained preform rod was spun into a yarn with an outer diameter of 10 μm.
As shown in FIG. 3, a bare fiber having a core diameter of 7 μm and a cladding thickness of 1.51 tm was obtained, and the core occupation rate was 49%.
比較のために、出発石英管ｌを除去せずにそのままプリ
フォームロッドを紡糸して外径１２ｇｍの素線ファイバ
を作成したところ、第４図に示すように、コア径が７Ｂ
ｍ、クラッド厚が１．５用ｍ、出発石英管厚がＩｇｍの
素線ファイバが得られ、そのコア占有率は３４％であっ
た。For comparison, a raw fiber with an outer diameter of 12 gm was created by spinning the preform rod without removing the starting quartz tube l, and as shown in Figure 4, the core diameter was 7B.
A bare fiber was obtained with a cladding thickness of 1.5 m, a starting quartz tube thickness of Igm, and a core occupation rate of 34%.
尚、上記実施例において、ＳＦｓに変えてＣＦ４及びＣ
２Ｆ ｅガスをそれぞれ同流量で加熱炉５内に導入し、
これらガスを次式に示すように出発石英管ｌと反応させ
た。In the above embodiment, CF4 and C were used instead of SFs.
Introducing 2Fe gas into the heating furnace 5 at the same flow rate,
These gases were reacted with the starting quartz tube l as shown in the following equation.
５ｉ０２＋ＣＦ４→
Ｓ ｉ Ｆ４↑＋ＣＯ２↑・・・・（２）３Ｓ ｉ０２
＋２Ｃ２Ｆｓ ＋０２→３ＳｉＦ４↑＋４ＣＯ２↑・
・・−（３）しかし、これらガスの反応は遅く、又出発
石英管１を完全に除去するまで反応することもなかった
。5i02+CF4→S i F4↑+CO2↑・・・(2)3S i02
+2C2Fs +02→3SiF4↑+4CO2↑・
(3) However, the reaction of these gases was slow and did not occur until the starting quartz tube 1 was completely removed.
（発明の効果）
本発明によれば、出発石英管を含むプリフォームロッド
を六フッ化イオウ雰囲気中に配設すると共に加熱するこ
とで、クラッド層にクラックを生じさせることなく出発
石英管を六フッ化イオウと反応させて短時間で除去する
こ・とができる、従って、コア占有率が大きく、かつ低
屈折率ドーパントを多量に含む開口数の大きい素線ファ
イバを容易に作成することができるので、明るさの優れ
たイメージガイドやバンドルファイバを提供することが
できる。(Effects of the Invention) According to the present invention, by placing the preform rod containing the starting quartz tube in a sulfur hexafluoride atmosphere and heating it, the starting quartz tube can be heated without causing any cracks in the cladding layer. It can be removed in a short time by reacting with sulfur fluoride. Therefore, it is possible to easily create a bare fiber with a large core occupancy and a large numerical aperture containing a large amount of low refractive index dopant. So it can provide a better image guide or bundle fiber with brightness.
第１図はプリフォームロッドの作成工程を示す断面図、
第２図は本発明方法を説明するための概略図、第３図は
本発明方法により出発石英管を除去したプリフォームロ
ッドから作成した素線ファイバの断面図、第４図は出発
石英管を含むプリフォームロッドから作成した素線ファ
イバの断面図である。
１−−−−−−−−一出発石英管、
２−−−−−−−−−クラッド層、
３−−−−−−−ｍ−石英コア棒、
４−−−−−−−−一プリフォームロッド、５−−−−
−−−−一加熱炉、
６−−−−−−−−−支持棒、
７−−−−−−−−−カーボンヒータ。
第１図
第２Ｆｌ！Ｊ
第３図
第４図Figure 1 is a sectional view showing the process of making a preform rod;
Fig. 2 is a schematic diagram for explaining the method of the present invention, Fig. 3 is a cross-sectional view of a bare fiber made from a preform rod from which the starting quartz tube has been removed by the method of the present invention, and Fig. 4 shows the starting quartz tube. FIG. 3 is a cross-sectional view of a bare fiber made from a preform rod containing the preform rod. 1----------One starting quartz tube, 2----------Clad layer, 3----------M-Quartz core rod, 4--------------------- 1 preform rod, 5
----1 heating furnace, 6--------support rod, 7--carbon heater. Figure 1 2Fl! J Figure 3 Figure 4
Claims (1)
内にコア棒を挿入し、前記出発石英管の外周を加熱して
前記出発石英管及びクラッド層を軟化させながら前記コ
ア棒と一体化して得たプリフォームロッドにおいて、前
記プリフォームロッドを六フッ化イオウ雰囲気中に配設
し、加熱することにより前記出発石英管と前記六フッ化
イオウとを反応させ、前記出発石英管を除去することを
特徴とするプリフォームロッドの出発石英管除去方法。 ２、前記六フッ化イオウを前記出発石英管の周面にキャ
リアガスを介して流しつつ前記プリフォームロッドを回
転させ、かつ軸方向に移動させることを特徴とする特許
請求の範囲第１項に記載のプリフォームロッドの出発石
英管除去方法。[Claims] 1. A core rod is inserted into a starting quartz tube having a cladding layer provided on the inner wall circumference, and while the outer periphery of the starting quartz tube is heated to soften the starting quartz tube and the cladding layer. In the preform rod obtained by integrating the core rod, the preform rod is placed in a sulfur hexafluoride atmosphere and heated to cause the starting quartz tube to react with the sulfur hexafluoride. A method for removing a starting quartz tube from a preform rod, the method comprising removing the starting quartz tube. 2. The preform rod is rotated and moved in the axial direction while flowing the sulfur hexafluoride onto the circumferential surface of the starting quartz tube via a carrier gas. The starting quartz tube removal method for the preform rod described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8586784A JPS60231428A (en) | 1984-04-27 | 1984-04-27 | Method for removing starting quartz tube of preform rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8586784A JPS60231428A (en) | 1984-04-27 | 1984-04-27 | Method for removing starting quartz tube of preform rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60231428A true JPS60231428A (en) | 1985-11-18 |
Family
ID=13870842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8586784A Pending JPS60231428A (en) | 1984-04-27 | 1984-04-27 | Method for removing starting quartz tube of preform rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60231428A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045233A (en) * | 2013-03-15 | 2014-09-17 | Ofs菲特尔有限责任公司 | Large Core Multimode Optical Fibers |
-
1984
- 1984-04-27 JP JP8586784A patent/JPS60231428A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104045233A (en) * | 2013-03-15 | 2014-09-17 | Ofs菲特尔有限责任公司 | Large Core Multimode Optical Fibers |
| JP2014181175A (en) * | 2013-03-15 | 2014-09-29 | Ofs Fitel Llc | Large diameter core multimode optical fiber |
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