CN104628250A - Fiber manufacturing method and fiber drawing furnace - Google Patents
Fiber manufacturing method and fiber drawing furnace Download PDFInfo
- Publication number
- CN104628250A CN104628250A CN201410639842.1A CN201410639842A CN104628250A CN 104628250 A CN104628250 A CN 104628250A CN 201410639842 A CN201410639842 A CN 201410639842A CN 104628250 A CN104628250 A CN 104628250A
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- gas
- optical fiber
- core barrel
- upper chamber
- stove core
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- 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
-
- 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
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- 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
The invention provides a fiber manufacturing method and a fiber drawing furnace, wherein the application amount of the helium gas is reduced and the pressure variation inside the furnace is lowered. Meanwhile, the gas is kept at a certain degree. The fiber drawing furnace (10) comprises a furnace tube (15) used for feeding glass parent material (11); a heater (16) arranged at the periphery of the furnace tube (15); and an upper chamber (20) connected with the upper part of the furnace tube (15) and used for accommodating the glass parent material (11).
Description
Technical field
The present invention relates to and a kind ofly melt drawing is carried out to glass base material for optical fiber and manufactures the method for optical fiber and be applicable to the fibre drawing furnace of the method.
Background technology
In order to carry out melt drawing to the glass base material for optical fiber (following, also referred to as base glass material) using silica glass as main component and manufacture optical fiber, use fibre drawing furnace (following, also referred to as fiber drawing furnace).Optical fiber is manufactured by following process, that is, make base glass material decline in the upper direction stove core barrel of fiber drawing furnace, on one side its front end of heating and melting, and the front end of base glass material is gone out from the below wire drawing of fiber drawing furnace by thin footpath.Temperature in fiber drawing furnace is now about 2000 DEG C, and temperature is very high, so parts in fiber drawing furnace use thermotolerance preferably carbon etc.
The character that this carbon has oxidation in the oxygen-containing atmosphere of high temperature and is consumed.Therefore, the atmosphere remaining the rare gas such as argon gas, helium, nitrogen (hereinafter referred to as rare gas element etc.) is needed in fiber drawing furnace.And, in this case, be set to malleation by fiber drawing furnace, to prevent extraneous gas (oxygen) from entering in fiber drawing furnace, if but pressure variation in fiber drawing furnace becomes large, then and accompany therewith, the glass diameter of optical fiber can change sometimes.
According to the international standard of single-mode fiber, i.e. ITU-T (International Telecommunication Union-Telecommunication sector) G652D, the variation tolerable limit of the glass diameter of optical fiber is defined as ± and 1 μm.In order to meet this regulation, make the effort of the pressure variation in all suppression fiber drawing furnaces.
In Japanese Unexamined Patent Application Publication 2013-512463 publication (patent documentation 1), disclose following technology, namely there is heating and melting base glass material and process the drawing heating furnace of optical fiber, and from rare gas elementes etc. such as the upper end of drawing heating furnace and bottom supply helium, nitrogen, argon gas.In patent documentation 1, do not specify supplied gaseous species.In Japanese Unexamined Patent Publication 9-2832 publication (patent documentation 2), disclose by well heater around stove core barrel above there is the upper chamber of chimney shape, the upper end of upper chamber is carried out to the technology of heating and thermal insulation.Thus, make the surrounding of stove core barrel less with the temperature head of the upper end of upper chamber, prevent from producing convection current in fiber drawing furnace and preventing pressure variation.In Japanese Unexamined Patent Publication 2000-63142 publication (patent documentation 3), disclose and the gas flow of the gas mouth blown supply above fiber drawing furnace is adjusted, to make the technology of the maintain constant pressure in fiber drawing furnace.The impact of the pressure variation in fiber drawing furnace by the convection phenomena of gas is enlightened in patent documentation 2, patent documentation 3.
Summary of the invention
The object of the present invention is to provide a kind of while the usage quantity reducing helium, the pressure variation in fiber drawing furnace can reduction, and gas flow is ensured methods for optical fiber manufacture to a certain degree and be used in the fibre drawing furnace of the method.
For the attainment of one's purpose, the invention provides a kind of methods for optical fiber manufacture, (1) its by glass base material for optical fiber to having stove core barrel, heating part, and the fibre drawing furnace supply of upper chamber, and be housed in stove core barrel and chamber, wherein, this heating part is arranged on around stove core barrel, this upper chamber is attached at the top of stove core barrel, (2) in this methods for optical fiber manufacture, while import path supply helium from the 1st gas arranged in upper chamber, and the 2nd gas arranged from the bottom importing path at the 1st gas imports path supply argon gas or nitrogen, while make the bottom heating and melting of glass base material for optical fiber and wire drawing goes out optical fiber.
As other embodiment of the present invention, provide a kind of fibre drawing furnace, it has: (1) is supplied to the stove core barrel of glass base material for optical fiber; (2) heating part, it is arranged on around stove core barrel; (3) upper chamber, it is attached at the top of stove core barrel and up-winding fiber base glass material; (4) the 1st gases import path, and it is arranged at upper chamber, for supplying helium; And (5) the 2nd gas import path, it is arranged at the 1st gas and imports the bottom of path, and for supplying argon gas or nitrogen, this fibre drawing furnace makes the bottom heating and melting of glass base material for optical fiber and wire drawing goes out optical fiber.
In fibre drawing furnace of the present invention, also can be that the 2nd gas imports channel setting in upper chamber, the fore-end that the 2nd gas imports path be bending to the direction of stove core barrel.
The effect of invention
According to foregoing invention, while the usage quantity reducing helium, the pressure variation in fiber drawing furnace can be reduced, and gas flow ensured to a certain degree.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the methods for optical fiber manufacture that relates to of an embodiment of the invention and the fibre drawing furnace that is used in the method.
Fig. 2 is the schematic diagram of other example that gas supply mechanism is shown.
Fig. 3 is the table of the example that glass external diameter change and furnace pressure change the measuring result corresponding with the ratio of argon gas is shown.
Fig. 4 is the graphic representation of the measuring result that Fig. 3 is shown.
Embodiment
When using helium as the rare gas element supplied to fiber drawing furnace etc., because this helium is expensive and rare, so the method proposing to have the more inexpensive gas of mixing argon gas geometric ratio and use.In this case, if merely by argon gas and helium mix, then produce pressure variation in stove, the glass diameter change of optical fiber is likely caused because of this pressure variation.
Pressure variation in fiber drawing furnace can be thought to occur in the inside of upper chamber.That is, upper chamber be arranged on by well heater around stove core barrel above, therefore risen to upper chamber by the gas of heater heats, again decline after upper chamber inside is cooled.Now, if use argon gas, nitrogen, then the density difference (temperature head) of the gas density in the gas density in upper chamber and stove core barrel becomes large, can expect that easy producer internal pressure changes due to this density difference.Thus, form the flowing instability being in the gas of the atmosphere of the bottom of the base glass material of thermoplastic state, the variation of the glass diameter of optical fiber becomes large.
When only being used as rare gas element by helium, the chances are compared with argon gas about 1/10 and less for the density difference caused by gas temperature differential, and therefore problem is little.Even if be mixed in helium by the argon gas of small quantity, furnace pressure variation also can be produced thus, its result, the glass diameter change of optical fiber.Therefore, when using when the mixed gas of helium and argon gas is replaced into helium merely, the more difficult regulation meeting the glass diameter variation of above-mentioned ± 1 μm.
Preferably be used alone helium, but due to helium expensive and rare, therefore wish to reduce its usage quantity as far as possible.But if do not ensure to a certain degree by the gas flow flowed downward in fiber drawing furnace, then the unfavorable conditions such as flue dust accumulates in stove can occur, and therefore only merely reducing flow cannot deal with problems.Therefore, it is desirable to while the usage quantity reducing helium, furnace pressure variation to be reduced, in addition gas flow is ensured method to a certain degree.Patent documentation 1 ~ patent documentation 3 does not solve problem described above.
Below, with reference to accompanying drawing, the concrete example of the methods for optical fiber manufacture that embodiments of the present invention are related to and the fibre drawing furnace that is used in the method is described.In addition, the invention is not restricted to these and illustrate, its object is to comprise by shown in the scope of claim, with all changes in the scope equivalents of claim and scope.
Fig. 1 is the manufacture method of the optical fiber that an embodiment of the invention relate to and the schematic diagram of use fibre drawing furnace 10 in the method.In addition, below to utilize well heater to be described the resistance furnace that stove core barrel heats, but the present invention also can be applied to winding applying high frequency electric source, stove core barrel is carried out to the induction furnace of induction heating.
Fiber drawing furnace 10 roughly divides and is made up of stove basket 18, lower chamber 19 and upper chamber 20.Stove core barrel 15 is formed with cylindrical shape at the central part of stove basket 18, and lower side and lower chamber 19 link, and upper side and upper chamber 20 link.Stove core barrel 15 is made up of carbon, and base glass material 11 is inserted in this stove core barrel 15 via upper chamber 20.
Upper chamber 20 has the internal diameter with stove core barrel 15 same degree, configures lid 21 at its upper end and carries out capping (sealing).Lid 21 forms upper end open 21a, inserts by the support stick 13 formed with the congener glass stick of base glass material 11.In stove basket 18, the well heater 16 as an example of heating part of the present invention configures in the mode of surrounding stove core barrel 15, is received by heat insulating member 17 in the mode in the outside covering well heater 16.Well heater 16 will be inserted in base glass material 11 heating and melting of the inside of stove core barrel 15, and the optical fiber 12 of melting necking down is hung down from lower chamber 19.
Base glass material 11 in linking portion 14 place linked with support stick 13 and support stick 13 welding, or to connect with support stick 13 via connecting member and integrated.In addition, base glass material 11 can pass through travel mechanism (not shown) and move at wire-drawing direction (above-below direction).
Fiber drawing furnace 10 is provided with the feed mechanism of gas.More specifically, arrange the 1st gas import path 22a and the 1st gas supply part 23a in upper chamber 20, the bottom importing path 22a at the 1st gas arranges the 2nd gas importing path 22b and the 2nd gas supply part 23b.Thereby, it is possible to rare gas element etc. sent in fiber drawing furnace 10, prevent the oxidation around stove core barrel 15, well heater 16, aging.
The feed rate of this rare gas element etc. can be set to constant basis flowing all the time, in addition, also can be the various controls utilizing gas supply part 23 and apply P control (Proportional Control: ratio control), I control (Integral Control: integral control), D control (Derivative Control: differential controls) or these controls appropriately combined and obtain, but control method be not limited thereto.In addition, also can functional quality flow director (MFC) as this gas supply part 23.These rare gas elementes etc., by the gap between base glass material 11 and stove core barrel 15, also externally discharge from the gate portion etc. of the below of lower chamber 19 together with the optical fiber 12 that wire drawing goes out.
, as this rare gas element etc., use if be mixed in helium by argon gas herein, then, compared with 100% situation using helium, be easy to pressure variation occurs, the external diameter variation of optical fiber 12 becomes large.Replace argon gas and use nitrogen to be also roughly similar result.
Main purpose of the present invention is while the usage quantity reducing helium, to reduce the furnace pressure variation of the gas in fiber drawing furnace, and ensured to a certain degree by gas flow.Make structure for achieving the above object, fiber drawing furnace 10 has: stove core barrel 15; Well heater 16, its example as heating part and be arranged on stove core barrel 15 around; Upper chamber 20, the top of itself and stove core barrel 15 links, and accommodates base glass material 11, and this fiber drawing furnace 10 is by the bottom heating and melting that is supplied to the base glass material 11 of stove core barrel 15 and wire drawing goes out optical fiber.And, import path 22a from the 1st gas arranged in upper chamber 20 and supply helium, and the 2nd gas importing path 22b arranged from the bottom importing path 22a at the 1st gas supplies argon gas or nitrogen.Below, exemplify argon gas and be described, certainly using nitrogen also can obtain same effect.
As long as position relationship the 1st gas importing path 22a of the 1st gas importing path 22a and the 2nd gas importing path 22b is configured in top compared with importing path 22b with the 2nd gas, be not limited to the 1st gas and import the upper end that path 22a is configured in upper chamber 20, the 2nd gas imports the structure that path 22b is configured in bottom.But in order to make helium be full of upper chamber 20, the 1st gas imports path 22a to be needed to be positioned at upper chamber 20.In addition, the 2nd gas imports path 22b and is configured in the bottom of upper chamber 20 or pressure variation can be made to reduce further in portion more on the lower than this, therefore more preferably.
Import path supply helium from the gas arranged in upper chamber 20, thus upper chamber 20 is full of by helium.Therefore, the variation of furnace pressure reduces.In addition, the underfeed argon gas of path 22a is imported from the 1st gas, thus the total flow of flow in stove core barrel 15 helium and argon gas, therefore, it is possible to guarantee not produce the sufficient gas flow needed for unfavorable condition such as flue dust accumulation.In addition, the 1st gas imports path 22a and the 2nd gas importing path 22b is not limited to each 1 place, also can arrange many places.
Fig. 2 is the schematic diagram of other example that gas supply mechanism is shown.In this example, the 2nd gas imports path 22b ' and is arranged on upper chamber 20, and the fore-end that the 2nd gas imports path 22b ' is bending to the direction (downwards) of stove core barrel 15.Outlet of still is positioned at below, and the gas therefore imported from the side of upper chamber 20 flows downward usually, by being set to bend, the argon gas importing path 22b ' supply from the 2nd gas can be made reliably to flow downward.In addition, the curved shape that the 2nd gas imports the fore-end of path 22b ' can not be towards immediately below shape, also can be as shape obliquely downward.
Fig. 3 is the figure that glass external diameter change and furnace pressure change the measuring result corresponding with the ratio of argon gas is shown.Fig. 3 (A) is comparative example, is to import from the 1st gas of Fig. 1 the example that path 22a supplies the situation of the mixed gas of helium and argon gas.In this case, the 2nd gas imports path 22b closedown.In addition, Fig. 3 (B) is embodiment, is to import path 22a from the 1st gas of Fig. 1 respectively to supply helium, imports from the 2nd gas the example that path 22b supplies the situation of argon gas.
In addition, in the comparative example of Fig. 3 (A) and the embodiment of Fig. 3 (B), the total flow of helium and argon gas is set to identical in each condition.In addition, furnace pressure variation (Pa) measures the fluctuation (standard deviation) of pressing in the benchmark relative to fiber drawing furnace 10, gets its value of 3 times (3 σ).In addition, glass external diameter variation (μm) measures the fluctuation (standard deviation) of the basic major diameter (125 μm) with optical fiber 12, gets its value of 3 times (3 σ).
Usually, along with using the ratio of argon gas to become large, the pressure variation in fiber drawing furnace becomes large.And, when the known comparative example at Fig. 3 (A), if the ratio (%) of the argon gas supplied as the mixed gas with helium be set to 0,33,50 and increase gradually, then furnace pressure variation (Pa) of fiber drawing furnace 10 becomes large, and glass external diameter variation (μm) of optical fiber 12 also becomes large together therewith.Relative to this, when the known embodiment at Fig. 3 (B), even if the ratio (%) of separating the argon gas supplied with helium is set to 0,11,50,60 and increases gradually, furnace pressure variation (Pa) of fiber drawing furnace 10 also remains constant to a certain degree in lower level, and glass external diameter variation (μm) of optical fiber 12 is also suppressed.
Fig. 4 is the figure measuring result of Fig. 3 being expressed as graphic representation.Fig. 4 (A) illustrates the ratio (argon concentration) of argon gas and the relation of furnace pressure variation, and in the drawings, transverse axis represents argon concentration (%), and the longitudinal axis represents furnace pressure variation (± 3 σ) (Pa).In addition, Fig. 4 (B) illustrates the relation of argon concentration and the variation of glass external diameter, and in the drawings, transverse axis represents argon concentration (%), and the longitudinal axis represents glass external diameter variation (± 3 σ) (μm).
In Fig. 4 (A), when comparative example 31, also become large along with argon concentration becomes the variation of large furnace pressure.In contrast, when embodiment 32, even if argon concentration becomes large, furnace pressure variation also remains constant to a certain degree in lower level, and furnace pressure changes and reduces compared with comparative example 31.Also be same situation in Fig. 4 (B), when comparative example 33, also become large along with argon concentration becomes the variation of large glass external diameter.In contrast, when embodiment 34, even if argon concentration becomes large, the variation of glass external diameter also remains constant to a certain degree in lower level, and glass external diameter changes and reduces compared with comparative example 33.
As previously discussed, by being full of in the upper chamber as the occurring source of pressure variation with helium, and the part argon gas of the helium flowed in stove is replaced, and can, while the usage quantity reducing helium, make the pressure variation in stove reduce and suppress the variation of the glass external diameter of optical fiber.On the other hand, at the gas of stove heart Bottomhole pressure, gas flow ensures to a certain degree by the mixed gas as helium and argon gas, thus can prevent the unfavorable condition of piling up in stove or floating flue dust touches optical fiber and causes fiber strength reduction etc. such.
Claims (3)
1. a methods for optical fiber manufacture, its by glass base material for optical fiber to the fibre drawing furnace supply with stove core barrel, heating part and upper chamber, and be housed in described stove core barrel and described chamber, wherein, this heating part is arranged on around this stove core barrel, this upper chamber is attached at the top of described stove core barrel
In this methods for optical fiber manufacture,
While import path supply helium from the 1st gas arranged in described upper chamber, and the 2nd gas arranged from the bottom importing path at described 1st gas imports path supply argon gas or nitrogen, makes the bottom heating and melting of described glass base material for optical fiber and wire drawing goes out optical fiber.
2. a fibre drawing furnace, it has:
Be supplied to the stove core barrel of glass base material for optical fiber;
Heating part, it is arranged on around this stove core barrel;
Upper chamber, it is attached at the top of described stove core barrel and accommodates described glass base material for optical fiber;
1st gas imports path, and it is arranged at described upper chamber, for supplying helium; And
2nd gas imports path, and it is arranged at the bottom that described 1st gas imports path, for supplying argon gas or nitrogen,
This fibre drawing furnace makes the bottom heating and melting of described glass base material for optical fiber and wire drawing goes out optical fiber.
3. fibre drawing furnace according to claim 2, wherein,
Described 2nd gas imports channel setting in described upper chamber, and the fore-end that described 2nd gas imports path is bending to the direction of described stove core barrel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013235010A JP5880522B2 (en) | 2013-11-13 | 2013-11-13 | Optical fiber manufacturing method and optical fiber drawing furnace |
| JP2013-235010 | 2013-11-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104628250A true CN104628250A (en) | 2015-05-20 |
| CN104628250B CN104628250B (en) | 2019-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410639842.1A Active CN104628250B (en) | 2013-11-13 | 2014-11-13 | Methods for optical fiber manufacture and fibre drawing furnace |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5880522B2 (en) |
| CN (1) | CN104628250B (en) |
| HK (1) | HK1206326A1 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944763A (en) * | 2015-06-05 | 2015-09-30 | 江苏斯德雷特通光光纤有限公司 | Technology for reducing He flow in wire drawing furnace by PID software trigger function |
| CN105271710A (en) * | 2015-11-13 | 2016-01-27 | 成都中住光纤有限公司 | Optical fiber drawing furnace |
| CN110272201A (en) * | 2018-03-13 | 2019-09-24 | 康宁股份有限公司 | Method and apparatus for the gas recovery in fibre-optical drawing furnace |
| CN111032588A (en) * | 2017-08-28 | 2020-04-17 | 住友电气工业株式会社 | Method for manufacturing optical fiber |
| CN111656234A (en) * | 2018-01-11 | 2020-09-11 | 住友电气工业株式会社 | Optical fiber, coated optical fiber and optical transmission system |
| CN111902376A (en) * | 2018-03-22 | 2020-11-06 | 康宁股份有限公司 | Method and apparatus for suppressing flow instabilities in fiber draw systems |
| CN112456786A (en) * | 2019-09-09 | 2021-03-09 | 住友电气工业株式会社 | Method for manufacturing optical fiber and optical fiber cooling device |
| CN114212990A (en) * | 2021-12-30 | 2022-03-22 | 中国建筑材料科学研究总院有限公司 | Optical fiber drawing furnace |
| US11498862B2 (en) | 2020-01-24 | 2022-11-15 | Corning Incorporated | Optical fiber draw furnace system and method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62207735A (en) * | 1986-03-07 | 1987-09-12 | Sumitomo Electric Ind Ltd | Method and device for drawing optical fiber |
| JPH0977528A (en) * | 1995-09-18 | 1997-03-25 | Furukawa Electric Co Ltd:The | Optical fiber drawing furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0530126U (en) * | 1991-10-01 | 1993-04-20 | 株式会社フジクラ | Optical fiber spinning device |
-
2013
- 2013-11-13 JP JP2013235010A patent/JP5880522B2/en active Active
-
2014
- 2014-11-13 CN CN201410639842.1A patent/CN104628250B/en active Active
-
2015
- 2015-07-22 HK HK15106990.0A patent/HK1206326A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62207735A (en) * | 1986-03-07 | 1987-09-12 | Sumitomo Electric Ind Ltd | Method and device for drawing optical fiber |
| JPH0977528A (en) * | 1995-09-18 | 1997-03-25 | Furukawa Electric Co Ltd:The | Optical fiber drawing furnace |
Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104944763A (en) * | 2015-06-05 | 2015-09-30 | 江苏斯德雷特通光光纤有限公司 | Technology for reducing He flow in wire drawing furnace by PID software trigger function |
| WO2016192340A1 (en) * | 2015-06-05 | 2016-12-08 | 江苏斯德雷特通光光纤有限公司 | Process using pid software to trigger function for reducing he flow in drawing furnace |
| CN105271710A (en) * | 2015-11-13 | 2016-01-27 | 成都中住光纤有限公司 | Optical fiber drawing furnace |
| CN111032588B (en) * | 2017-08-28 | 2022-07-08 | 住友电气工业株式会社 | Method for manufacturing optical fiber |
| CN111032588A (en) * | 2017-08-28 | 2020-04-17 | 住友电气工业株式会社 | Method for manufacturing optical fiber |
| CN111656234B (en) * | 2018-01-11 | 2022-05-17 | 住友电气工业株式会社 | Optical fiber, coated optical fiber and optical transmission system |
| CN111656234A (en) * | 2018-01-11 | 2020-09-11 | 住友电气工业株式会社 | Optical fiber, coated optical fiber and optical transmission system |
| US11981596B2 (en) | 2018-03-13 | 2024-05-14 | Corning Incorporated | Method and apparatus for reclaiming gas in a fiber draw furnace |
| CN110272201A (en) * | 2018-03-13 | 2019-09-24 | 康宁股份有限公司 | Method and apparatus for the gas recovery in fibre-optical drawing furnace |
| CN110272201B (en) * | 2018-03-13 | 2023-03-10 | 康宁股份有限公司 | Method and apparatus for recovering gas in an optical fiber drawing furnace |
| US11198636B2 (en) | 2018-03-22 | 2021-12-14 | Corning Incorporated | Method and apparatus for suppressing flow instabilities in an optical fiber draw system |
| CN111902376A (en) * | 2018-03-22 | 2020-11-06 | 康宁股份有限公司 | Method and apparatus for suppressing flow instabilities in fiber draw systems |
| CN111902376B (en) * | 2018-03-22 | 2022-11-18 | 康宁股份有限公司 | Method and apparatus for suppressing flow instabilities in fiber draw systems |
| US11554980B2 (en) | 2018-03-22 | 2023-01-17 | Corning Incorporated | Method and apparatus for suppressing flow instabilities in an optical fiber draw system |
| CN112456786B (en) * | 2019-09-09 | 2024-04-30 | 住友电气工业株式会社 | Optical fiber manufacturing method and optical fiber cooling device |
| CN112456786A (en) * | 2019-09-09 | 2021-03-09 | 住友电气工业株式会社 | Method for manufacturing optical fiber and optical fiber cooling device |
| US11498862B2 (en) | 2020-01-24 | 2022-11-15 | Corning Incorporated | Optical fiber draw furnace system and method |
| US11820696B2 (en) | 2020-01-24 | 2023-11-21 | Corning Incorporated | Optical fiber draw furnace system and method |
| CN114212990B (en) * | 2021-12-30 | 2023-08-15 | 中国建筑材料科学研究总院有限公司 | Optical fiber drawing furnace |
| CN114212990A (en) * | 2021-12-30 | 2022-03-22 | 中国建筑材料科学研究总院有限公司 | Optical fiber drawing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5880522B2 (en) | 2016-03-09 |
| JP2015093815A (en) | 2015-05-18 |
| HK1206326A1 (en) | 2016-01-08 |
| CN104628250B (en) | 2019-04-26 |
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