JPS6128613B2 - - Google Patents
Info
- Publication number
- JPS6128613B2 JPS6128613B2 JP56081135A JP8113581A JPS6128613B2 JP S6128613 B2 JPS6128613 B2 JP S6128613B2 JP 56081135 A JP56081135 A JP 56081135A JP 8113581 A JP8113581 A JP 8113581A JP S6128613 B2 JPS6128613 B2 JP S6128613B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- core tube
- optical fiber
- gas
- strength
- 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
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
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)
Description
【発明の詳細な説明】
本発明は光フアイバを線引きするための炉に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a furnace for drawing optical fiber.
光フアイバ特に石英系光フアイバの製造工程の
うち、線引き工程における線引き用熱源として
は、カーボン抵抗炉、高周波誘導加熱炉が用いら
れていた。従来から主に用いられているカーボン
抵抗炉では、発熱体の消耗を防視するため、炉内
部にAr、N2などの不活性ガスを流入させてい
た。 BACKGROUND OF THE INVENTION Carbon resistance furnaces and high-frequency induction heating furnaces have been used as heat sources for drawing in the drawing process in the manufacturing process of optical fibers, particularly quartz-based optical fibers. In carbon resistance furnaces, which have been mainly used in the past, inert gases such as Ar and N2 are flowed into the furnace to prevent the heating element from being worn out.
従来のこの種の炉ではガスの流出入法は特定の
方法がなく、内部を不活性雰囲気に保つことが主
目的であつた。このため炉内部において、発熱体
や保温材の消耗などによつて発生したカーボンの
微粒子、不純物微粒子などが、線引きされた光フ
アイバ表面に付着し、光フアイバの強度を低下さ
せる要因となつていた。 In conventional furnaces of this type, there is no specific method for gas inflow and outflow, and the main purpose was to maintain an inert atmosphere inside. For this reason, inside the furnace, carbon particles and impurity particles generated due to consumption of the heating element and heat insulating material adhere to the surface of the drawn optical fiber, causing a decrease in the strength of the optical fiber. .
本発明はこれらの欠点を除去するため、炉心管
内部を流れるガスに強制的に流れを与えるように
したものである。以下図面により本発明を詳細に
説明する。 In order to eliminate these drawbacks, the present invention provides a forced flow to the gas flowing inside the reactor core tube. The present invention will be explained in detail below with reference to the drawings.
図は本発明の一実施例図であつて、石英光フア
イバの線引き炉に用いた例を示しており、１はガ
ラス母材、２は光フアイバ、３は炉体、４は発熱
体、５は炉心管、６はガス排気管、７はバルブ、
８は排気ポンプ、９はガス流入口である。 The figure is an embodiment of the present invention, and shows an example in which it is used in a quartz optical fiber drawing furnace, where 1 is a glass base material, 2 is an optical fiber, 3 is a furnace body, 4 is a heating element, and 5 is a drawing furnace. is the furnace core tube, 6 is the gas exhaust pipe, 7 is the valve,
8 is an exhaust pump, and 9 is a gas inlet.
これを動作するには、母材１を炉内部に徐々に
送り込み、発熱体４で加熱軟化すると、母材は径
が細くない、光フアイバ２に線引きされる。加熱
領域は炉心管５によつて発熱体４とは仕切られて
おり、炉心管５の内部にはガス流入口９からAr
ガスを流入させている。Arガスは排気管６を通
じて排気ポンプ８で強制的に排気されるが、バル
ブ７によつてその流量を制御してある。 To operate this, the base material 1 is gradually fed into the furnace, heated and softened by a heating element 4, and then the base material is drawn into an optical fiber 2 with a non-thin diameter. The heating region is separated from the heating element 4 by a furnace core tube 5, and Ar is supplied from the gas inlet 9 into the inside of the furnace core tube 5.
Gas is flowing in. Ar gas is forcibly exhausted through an exhaust pipe 6 by an exhaust pump 8, and its flow rate is controlled by a valve 7.
このような構造になつているから、炉心管内部
に、強制的にガスの一方向の流れが生じる。また
炉心管には高純度のカーボンを用いているが、そ
の消耗を防止するため、炉外部から空気を吸い込
まないように、バルブ７によつて排気量を調節す
る。炉心管内部のガスの流れの強さは、流入量お
よび排気量によつて調節することができる。この
ように炉心管内部にガスの強制的な流れが生じる
ので、炉心管内部に発生するカーボン等の微粒子
を排出することができる。その結果、光フアイバ
表面に微粒子が付着することによる光フアイバの
機械的強度の低下を防止することができ、均一な
強度を有する光フアイバを製造することができ
る。具体例として、炉心管内部にArガス６/mi
ｎ、排気量を４/minとして石英棒を線引きし、
シリコーン樹脂を被覆した石英フアイバを引張り
試験した結果を述べる。試料長を20ｍ、測定数を
318本とし、引張り速度５%/minにおいて、破断
強度は平均514Kg/mm2最小強度489Kg/mm2であつた。 Because of this structure, gas is forced to flow in one direction inside the reactor core tube. Further, although high-purity carbon is used for the furnace core tube, in order to prevent its consumption, the exhaust amount is adjusted by a valve 7 so as not to suck air from outside the furnace. The strength of the gas flow inside the reactor core tube can be adjusted by the inflow and exhaust volume. Since a forced flow of gas is generated inside the reactor core tube in this way, fine particles such as carbon generated inside the reactor core tube can be discharged. As a result, it is possible to prevent a decrease in the mechanical strength of the optical fiber due to the attachment of fine particles to the surface of the optical fiber, and it is possible to manufacture an optical fiber having uniform strength. As a specific example, Ar gas 6/mi inside the reactor core tube.
n, draw a line on a quartz rod with a displacement of 4/min,
We will present the results of a tensile test on a quartz fiber coated with silicone resin. Sample length: 20m, number of measurements:
With 318 pieces, the average breaking strength was 514 Kg/mm 2 and the minimum strength was 489 Kg/mm 2 at a tensile rate of 5%/min.
これを従来技術、すなわち炉心管上下よりそれ
ぞれAr3/minを流入させ、強制排気を行わず、
自然流出のまま線引きした石英フアイバでは500
Kg/mm2以上の高強度部分は得られるものの、破断
強度が78〜471Kg/mmに分布する低強度部分が40％
を占めていた。 This was done using conventional technology, in which Ar3/min was injected from the top and bottom of the reactor tube, without forced exhaust.
500 for quartz fiber drawn as it is naturally drained.
Although high-strength parts of Kg/mm 2 or higher are obtained, 40% of the parts have low-strength parts with breaking strengths ranging from 78 to 471 Kg/mm.
was occupied.
前述のように、強制配置ガスの流れを、下から
上への方向に与えることによる強度への影響は極
めて顕著である。 As mentioned above, the effect on strength of forcing gas flow in a bottom-to-top direction is quite significant.
排気量の調節は、炉心管内部を不活性に保ち、
周囲の空気の混入を防止するために、流入量を排
気量よりも多くして行う。 Adjustment of exhaust volume keeps the inside of the reactor core tube inert,
In order to prevent surrounding air from getting mixed in, the inflow volume is made larger than the exhaust volume.
以上説明したように、本発明の光フアイバ線引
き炉は、炉心管内部にガスの強制的流を生じさせ
ることによつて、光フアイバ表面へ微粒子が付着
することを防止できるので、均一な強度を有する
高強度光フアイバを製造できる利点がある。 As explained above, the optical fiber drawing furnace of the present invention can prevent fine particles from adhering to the optical fiber surface by generating a forced flow of gas inside the furnace tube, thereby achieving uniform strength. There is an advantage that a high-strength optical fiber having a high strength can be manufactured.
図は本発明の一実施例図である。
１……光フアイバ母材、２……光フアイバ、３
……炉体、４……発熱体、５……炉心管、６……
排気管、７……バルブ、８……排気ポンプ、９…
…ガス流入口。
The figure shows one embodiment of the present invention. 1... Optical fiber base material, 2... Optical fiber, 3
... Furnace body, 4 ... Heating element, 5 ... Furnace core tube, 6 ...
Exhaust pipe, 7...Valve, 8...Exhaust pump, 9...
...Gas inlet.
Claims (1)
光フアイバに線引きするための炉において、加熱
領域内部に炉心管を有し、炉心管と連続する炉下
部から炉心管内部にガスを供給し、炉心管と連続
する炉上部から炉心管内部のガスを排気装置を用
いて強制的に排気するようにしたことを特徴とす
る光フアイバ線引き炉。1. A furnace for heating and softening glass for optical fibers and drawing them into fibrous optical fibers, which has a furnace core tube inside the heating region, and supplies gas into the inside of the furnace core tube from a lower part of the furnace that is continuous with the furnace core tube, An optical fiber drawing furnace characterized in that the gas inside the furnace core tube is forcibly exhausted from the upper part of the furnace which is continuous with the furnace core tube using an exhaust device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8113581A JPS57196738A (en) | 1981-05-29 | 1981-05-29 | Drawing furnace for optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8113581A JPS57196738A (en) | 1981-05-29 | 1981-05-29 | Drawing furnace for optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57196738A JPS57196738A (en) | 1982-12-02 |
| JPS6128613B2 true JPS6128613B2 (en) | 1986-07-01 |
Family
ID=13737954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8113581A Granted JPS57196738A (en) | 1981-05-29 | 1981-05-29 | Drawing furnace for optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57196738A (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55154336A (en) * | 1979-05-22 | 1980-12-01 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of optical fiber raw material |
| JPS5654243A (en) * | 1979-10-12 | 1981-05-14 | Hitachi Ltd | Preparation of optical fiber matrix |
-
1981
- 1981-05-29 JP JP8113581A patent/JPS57196738A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57196738A (en) | 1982-12-02 |
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