CN103941331A - Polyimide coated optical fiber and machining process thereof - Google Patents
Polyimide coated optical fiber and machining process thereof Download PDFInfo
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- CN103941331A CN103941331A CN201410189285.8A CN201410189285A CN103941331A CN 103941331 A CN103941331 A CN 103941331A CN 201410189285 A CN201410189285 A CN 201410189285A CN 103941331 A CN103941331 A CN 103941331A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 92
- 239000004642 Polyimide Substances 0.000 title claims abstract description 82
- 229920001721 polyimide Polymers 0.000 title claims abstract description 82
- 238000003754 machining Methods 0.000 title abstract 2
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 239000010453 quartz Substances 0.000 claims abstract description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005253 cladding Methods 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims description 117
- 239000011248 coating agent Substances 0.000 claims description 102
- 238000004513 sizing Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 16
- 239000003708 ampul Substances 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 14
- 238000012545 processing Methods 0.000 claims description 14
- 238000007711 solidification Methods 0.000 claims description 14
- 230000008023 solidification Effects 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 11
- 239000001301 oxygen Substances 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000009477 glass transition Effects 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000005491 wire drawing Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 abstract description 15
- 239000011247 coating layer Substances 0.000 abstract description 10
- 230000032683 aging Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 230000005855 radiation Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000012792 core layer Substances 0.000 abstract 2
- 238000001723 curing Methods 0.000 description 25
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- -1 acryl Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 125000005462 imide group Chemical group 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
The invention relates to the technical field of optical fiber manufacture, in particular to a polyimide coated optical fiber and a machining process thereof. The polyimide coated optical fiber comprises a bare optical fiber and a coating layer, the diameter of the bare optical fiber ranges from 80 micrometers to 660 micrometers, the coating layer externally coats the bare optical fiber, the bare optical fiber comprises a quartz core layer and a quartz cladding layer externally surrounding the quartz core layer, a polyimide coating layer externally coats the quartz cladding layer, and the thickness of a single edge of the polyimide coating layer ranges from 10 micrometers to 25 micrometers. Polyimide materials coat the surface of the bare optical fiber, and compared with a conventional coated optical fiber, the polyimide coated optical fiber has the advantages of high temperature resistance, aging resistance, radiation resistance, stability, durability and the like and can be used for a long time in a high-temperature hostile environment for a long time. The diameter of the coating layer can be accurately controlled, deviation of the diameter is +/-3 micrometers, and the concentricity of the coating layer and the fiber cladding layer is smaller than or equal to 5.
Description
Technical field
The present invention relates to optic fibre manufacturing technology field, be specifically related to a kind of polyimide coated optical fiber and processing technology thereof.
Background technology
Along with the development of optical fiber technology, the application of optical fiber has extended to the fields such as laser energy transmission, sensing technology, and range of application has also extended to various high-temperature severe environments.Optical fiber transmits material as information, and its sandwich layer and covering are mainly made up of quartz, and the outer coating one deck coat of covering plays the effect of protection optical fiber.Ordinary optic fibre adopts ultra-violet curing acryl resin as coating, and its serviceability temperature is-60 DEG C-85 DEG C.If worked under the environment higher than 85 DEG C for a long time; can there is heat ageing in general ultraviolet solidified coating; particularly under the environment that has O2 to exist, can there is thermo-oxidative ageing; accelerate the fracture process of coating macromolecular chain; thereby make coating make the effect of its protection optical fiber, cannot stop hydrone to invade optical fiber, accelerate the fatigue process of optical fiber; make the expansion of optical fiber surface micro-crack, cause optical fiber to lose efficacy.
Summary of the invention
For the deficiency existing in prior art, the invention provides a kind of high temperature resistant, ageing-resistant, radiation hardness, stablize polyimide coated optical fiber and processing technology thereof durable, that can under high temperature rugged environment, use for a long time.
To achieve these goals, the present invention realizes by the following technical solutions:
A kind of polyimide coated optical fiber, comprise that diameter is the bare fibre of 80-660um and is coated in the coating outside bare fibre, bare fibre described in it is made up of quartzy sandwich layer and the quartzy covering that is looped around outside quartzy sandwich layer, and described quartzy covering is outer applies the polyimide coating that monolateral thickness is 10-25um; When bare fibre quartz cladding diameter is 80-300um, the monolateral thickness of polyimide coating is 10-15um; When bare fibre quartz cladding diameter is 300-660um, the monolateral thickness of polyimide coating is 15-25um; Bare fibre core bag is than for 1:1.1, and quartzy cladding diameter is while being 220-660um, and the monolateral thickness of polyimide coating is 15-25um.
Above-mentioned a kind of polyimide coated optical fiber, the density of the polyimide coating described in it is 1.38-1.43g/cm3.
Above-mentioned a kind of polyimide coated optical fiber, the glass transition temperature of the polyimide coating described in it is equal to or higher than 350 DEG C; The pulling strengrth of polyimide coating is equal to or greater than 150MPa.
A processing technology of making above-mentioned polyimide coated optical fiber, is characterized in that, its processing step is as follows:
(1) after using the clean preform of pure water, and use high-purity gas to make it dry;
(2) preform is carried out on wire-drawing equipment to wire drawing; The melting in pyrographite stove of optical fiber prefabricating nose, and under the traction of gravity and draw-off equipment, form a taper;
(3) cone front end, through the traction of draw-off equipment, through bare fibre examine of diameter instrument, under certain speed of reeling off raw silk from cocoons, obtains the uniform bare fibre of diameter;
(4) wired upper coating unit is installed in bare fibre examine of diameter instrument below, for polyimide solution being coated in to optical fiber outside surface; On line, coating unit comprises: sizing nib, coating bowl and water-bath base; Wherein above applying bowl, be provided with an air intake opening, for being passed into, pure gases at high pressure apply bowl, in water-bath base, be connected with the pure water of uniform temperature, apply bowl and fix by the mode that is placed in water-bath base, and transfer heat to the polyimide solution applying in bowl; At this temperature, the range of viscosities of polyimide solution is 3000MPa.s-9000MPa.s, and typical viscosities is 4000MPa.s-6000MPa.s.
Optical fiber enter apply bowl after through sizing nib, be coated with uniformly last layer polyimide solution at optical fiber outside surface;
(5) optical fiber is after sizing nib, and outside surface applies the uncured polyimide solution of last layer; On described line, below coating unit, wired upper solidification equipment is installed; On line, solidification equipment comprises: resistance-heated furnace, quartz ampoule, supply air system and exhausting system that inwall is column type; Wherein quartz ampoule mates with resistance-heated furnace inwall, and exhausting system is installed above heating furnace, and gas handling system is installed below heating furnace, makes a relatively independent atmosphere of formation in quartz ampoule;
(6) coating unit and solidification equipment totally two covers on line, are alternately installed in series; On line, coating-curing process carries out twice, completes preliminary coating, and its monolateral thickness is less than 50% of final thickness, and the glass transition temperature of coating is higher than 350 DEG C;
(7) preliminary coated fiber is received after take-up reel, be placed on a device with the fine function of automatic releasing, under the effect of the preliminary online lower traction equipment of optical fiber applying, through coating processes under the line of several coating units under line, and solidify in high temperature oven, make optical fiber finally apply external diameter and reach aimed dia, and measure the final external diameter that applies by outer diameter detecting instrument device; Receive afterwards on another take-up reel, complete whole coating processes.
As preferably, in described step (7), under line, coating processes is: hot setting baking oven top has aperture, and optical fiber is after coating unit, and outside surface has applied one deck polyimide solution, vertically enters high temperature oven;
High temperature oven inside is provided with guide wheel group, is vertically positioned at coating unit below, and its oblique upper is provided with another guide wheel group;
The optical fiber that is coated with polyimide solution winds the line in two guide wheel group, and typical winding length is 6-15m, and logical long-distance winds the line the duration of extended fiber in high temperature oven, makes the state of cure of coating higher;
Optical fiber after solidifying, by the deflecting roller in high temperature oven, is drawn high temperature oven, then through a deflecting roller, be introduced in next coating unit and apply, corresponding with this coating unit, oven interior is equipped with similar guide wheel group, winds the line curing for applying rear optical fiber in baking oven;
Through coating-curing process repeatedly, the coating thickness of optical fiber reaches desired value, can receive around complete whole coating processes to take-up reel.
As preferably, the horizontal two ends of described high temperature oven are provided with supply air system and exhausting system, and for form non-oxygen atmosphere in high temperature oven, and the solvent molecule producing when polyimide solution is solidified takes away, improves and solidifies quality; Air output is 100-150L/min, and exhausting amount is 100-200L/min.
As preferably, after applying curing process under line and finishing, optical fiber is by the outer diameter detecting instrument device of a placement vertical with this optical fiber, the instrument that external diameter detects is measured optical fiber external diameter, by the gap of measured value and desired value, control pressure and the bath temperature of high-purity gas in coating unit, apply the effect of external diameter to reach fine setting.
As preferably, the speed of reeling off raw silk from cocoons that described step (3) is certain is 5m/min-15m/min.
As preferably, in described step (5), described supply air system is introduced non-carrier of oxygen in quartz ampoule, and described non-carrier of oxygen is N2, and air output is 40-60L/min, makes to form in quartz ampoule non-oxygen atmosphere; The volatile solvent molecule that described exhausting system produces when polyimide coating is solidified is extracted out in time, and exhausting amount is 60-80L/min; Resistance-heated furnace temperature range is 150 DEG C-400 DEG C.
As preferably, the below of solidification equipment on outer diameter detecting instrument device hookup wire, for measuring the external diameter of optical fiber after preliminary coating, and shows; In described step (7), the haulage speed of draw-gear is 4-10m/min.
Beneficial effect:
Polyimide material is coated in bare fibre surface by the present invention, compared with conventional coated optical fiber, has high temperature resistant, ageing-resistant, radiation hardness, stablizes the features such as durable, and optical fiber can be used for a long time under high temperature rugged environment.The present invention can accurately control coating diameter, and diameter deviation is ± 3 μ m, concentricity≤5 of coat and fibre cladding.
Brief description of the drawings
Describe the present invention in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is structural representation of the present invention.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with embodiment, further set forth the present invention.
With reference to Fig. 1, the present invention includes diameter and be the bare fibre of 80-660um and be coated in the coating outside bare fibre, described bare fibre is made up of quartzy sandwich layer 1 and the quartzy covering 2 that is looped around outside quartzy sandwich layer, the polyimide coating 3 that the monolateral thickness of the quartz outer coating of covering 2 is 10-25um, the material of this polyimide coating 3 is equal benzene or the biphenyl type macromolecular compound that molecular backbone contains imide ring, and polyimide coating 3 is by forming at the outer coating polyimide solution of quartzy covering 2 and through heat curing.The density of polyimide coating 3 is 1.38-1.43g/cm3, and glass transition temperature is equal to or higher than 350 DEG C, and pulling strengrth is equal to or greater than 150MPa.
The present invention is the high temperature resistant single-mode fiber of communication, if the cladding diameter of bare fibre is 125 μ m, the monolateral thickness of polyimide coating is 10-15 μ m, this optical fiber is at 1310nm window attenuation coefficient≤0.6dB/km, at 1550nm window attenuation coefficient≤0.5dB/km, at 850nm window attenuation coefficient≤3.4dB/km, at 1300 window attenuation coefficient≤1.5dB/km.If cladding diameter is 80 μ m, the monolateral thickness of polyimide coating is 10 μ m, and this fiber work window is 1310nm, attenuation coefficient≤0.8dB/km.
If core bag is than being 1:1.1, surrounding layer diameter is 220-660 μ m, and the monolateral thickness of corresponding polyimide coating is 15-25 μ m, and this optical fiber is at 850nm window attenuation coefficient≤10dB/km, at the attenuation coefficient≤10dB/km of 1064nm window, at the attenuation coefficient≤8dB/km of 1300nm window.
Processing technology step of the present invention is as follows:
After using the clean preform of pure water, and use high-purity gas to make it dry.Preform is carried out on wire-drawing equipment to wire drawing.The melting in pyrographite stove of optical fiber prefabricating nose, and under the traction of gravity and draw-off equipment, form a taper.Cone front end, through the traction of draw-off equipment, through bare fibre examine of diameter instrument, under certain speed of reeling off raw silk from cocoons, obtains the uniform bare fibre of diameter.The speed of reeling off raw silk from cocoons is 5m/min-15m/min, and representative value is 10m/min.
Wired upper coating unit is installed in bare fibre examine of diameter instrument below, for polyimide solution being coated in to optical fiber outside surface.On line, coating unit comprises: sizing nib, coating bowl and water-bath base.Wherein above applying bowl, there is an air intake opening, apply bowl for pure gases at high pressure are passed into, make polyimide solution there is certain pressure.In water-bath base, be connected with the pure water of uniform temperature, apply bowl and fix by the mode that is placed in water-bath base, and transfer heat to the polyimide solution applying in bowl.At this temperature, the range of viscosities of polyimide solution is 3000MPa.s-9000MPa.s, and typical viscosities is 4000MPa.s-6000MPa.s.Optical fiber enter apply bowl after through sizing nib, be coated with uniformly last layer polyimide solution at its outside surface.The thickness of the polyimide solution applying is by the diameter of sizing nib and enter and be coated with the external diameter of optical fiber before orifice ring and determined.
Optical fiber is after sizing nib, and outside surface applies the uncured polyimide solution of last layer.On described line, below coating unit, wired upper solidification equipment is installed.On line, solidification equipment comprises: resistance-heated furnace, quartz ampoule, supply air system and exhausting system that inwall is column type.Wherein quartz ampoule can mate with resistance-heated furnace inwall, and exhausting system is installed above heating furnace, and gas handling system is installed below heating furnace, makes a relatively independent atmosphere of formation in quartz ampoule.The effect of supply air system is that non-carrier of oxygen is introduced in quartz ampoule, representative gases is N2, and air output is 40-60L/min, makes the non-oxygen atmosphere of formation in quartz ampoule, improve curing rate and the solidification effect of coating of polyimide, prevent that bulge and the defect such as recessed from appearring in coating in solidification process.The effect of exhausting system is that the volatile solvent molecule producing when polyimide coating is solidified is extracted out in time, can effectively promote curing of coatings speed, and the waste gas preventing pollutes to heating furnace surrounding atmosphere, and exhausting amount is 60-80L/min.Resistance-heated furnace temperature range is 150 DEG C-400 DEG C.
On line, coating unit and solidification equipment totally two covers, are alternately installed in series.On line, coating-curing process carries out twice, completes preliminary coating, and its monolateral thickness is less than 50% of final thickness, and the glass transition temperature of coating is higher than 350 DEG C.
Solidification equipment below on line, is provided with outer diameter detecting instrument device, for measuring the external diameter of optical fiber after preliminary coating, and shows.Can, according to the deviation of measured value and desired value, adjust charge flow rate and the bath temperature of coating unit on line, accurately control coating external diameter.
Outer diameter detecting instrument device below, is provided with optical fiber draw-gear and take-up, for the optical fiber tentatively applying is received around take-up reel, under pending line, applies curing process.
Preliminary coated fiber is received after take-up reel, be placed on a device with the fine function of automatic releasing, under the effect of the preliminary online lower traction equipment of optical fiber applying, through several coating units under line, and solidify in high temperature oven, make its final external diameter that applies reach aimed dia, and measure the final external diameter that applies by outer diameter detecting instrument device.Receive afterwards on another take-up reel, complete whole coating processes.Wherein payingoff speed and haulage speed and take-up speed, by computer fine adjustment, is mated three speed.Preferably, haulage speed is 4-10m/min.
Under line, coating unit is positioned at hot setting baking oven top, and on its structure and line, coating unit is similar, for polyimide solution being coated in to optical fiber outside surface.Hot setting baking oven top has aperture, and optical fiber is after coating unit, and outside surface has applied one deck polyimide solution, vertically enters high temperature oven.High temperature oven inside is provided with guide wheel group, is vertically positioned at coating unit below, and its oblique upper is provided with another guide wheel group.The optical fiber that is coated with polyimide solution winds the line in two guide wheel group, and typical winding length is 6-15m, and logical long-distance winds the line the duration of extended fiber in high temperature oven, makes the state of cure of coating higher.Optical fiber after solidifying, by the deflecting roller in high temperature oven, is drawn high temperature oven, then through a deflecting roller, be introduced in next coating unit and apply, corresponding with this coating unit, oven interior is equipped with similar guide wheel group, winds the line curing for applying rear optical fiber in baking oven.Through coating-curing process repeatedly, preferred, be 2-4 time, the coating thickness of optical fiber reaches desired value, can receive around complete whole coating processes to take-up reel.
The horizontal two ends of high temperature oven are provided with supply air system and exhausting system, for form non-oxygen atmosphere in high temperature oven, and by polyimide solution solidify time produce solvent molecule take away, improve solidify quality.Air output is 100-150L/min, and exhausting amount is 100-200L/min.
After applying curing process under line and finishing, optical fiber is by a vertical outer diameter detecting instrument device of placing with it, and the instrument that external diameter detects is measured optical fiber external diameter, and numerical value is fed back to operation interface.By the gap of measured value and desired value, control pressure and the bath temperature of high-purity gas in coating unit, apply the effect of external diameter to reach fine setting.
Embodiment 1:
With reference to Fig. 1, the quartzy sandwich layer diameter that the present invention includes bare fibre is 9 μ m, and quartzy cladding diameter is 125 μ m, and polyimide coating layer diameter is 155 μ m, is a kind of communication high-temperature resistant optical fiber.
Production stage: the preform that is 60mm by diameter melting in the pyrographite induction furnace of 1950 DEG C, by the traction drawing optic fibre that reels off raw silk from cocoons.The speed of reeling off raw silk from cocoons is 8m/min, and the cladding diameter of bare fibre is 125 μ m.Bare fibre is through coating-cure cycle on twice line, and after preliminary coating, polyimide coating external diameter is 137 μ m, and monolateral thickness is 6 μ m.Wherein on each line, applying curing process, to apply monolateral thickness be 3 μ m.The optical fiber tentatively applying is received around dish above to technique under pending line.The technological parameter applying on the line 1-1 that sees the following form:
Table 1-1
| Parameter name | Numerical value |
| Drawing speed, m/min | 8 |
| The viscosity of polyimide solution, MPa.s | 4500-6000 |
| The size of sizing nib 1, μ m | 166 |
| The size of sizing nib 2, μ m | 172.1 |
| Each rear curing time, s of applying | 15 |
| The temperature of curing oven 1, DEG C | 300 |
| The temperature of curing oven 2, DEG C | 360 |
| Curing oven air-supply, exhausting flow, L/min | 55，75 |
Under line, in technique, coating-cure cycle is carried out 3 times, and bare fibre enters hot setting baking oven and is cured after each coating, and apply monolateral thickness is 3 μ m at every turn, and the external diameter of final polyimide coating layer is 155 μ m, and monolateral thickness is 15 μ m.The coating processes parameter 1-2 that sees the following form under line:
Table 1-2
| Parameter name | Numerical value |
| Haulage speed, m/min | 8 |
| The size of sizing nib 3, μ m | 178.2 |
| The size of sizing nib 4, μ m | 184.3 |
| The size of sizing nib 5, μ m | 190.5 |
| Each rear curing time, s of applying | 90 |
| The temperature of hot setting baking oven, DEG C | 360 |
| Curing oven air-supply, exhausting flow, L/min | 110，150 |
Complete after final coating, finished product optical fiber is received and is had mercy on take-up reel, and production length is 1-6km.The optical fiber major parameter 1-3 that sees the following form
Table 1-3
| Parameter name | Technical indicator |
| 1310nm pad value, dB/km | ≤0.6 |
| 1550nm pad value, dB/km | ≤0.5 |
| Polyimide coating external diameter, μ m | 155±3 |
| Covering/coating concentricity, μ m | ≤5 |
Embodiment 2:
Embodiment 2 is with the difference of embodiment 1, and the sandwich layer diameter of bare fibre is 400 μ m, and cladding diameter is 440 μ m, and polyimide coating layer diameter is 470 μ m, is a kind of high temperature resistant large core diameter energy-transmission optic fibre.
Production stage: the inclined to one side prefabricated rods of guarantor that is 40mm by diameter is melting in the pyrographite induction furnace of 2050 DEG C in temperature, by the traction drawing optic fibre that reels off raw silk from cocoons.The speed of reeling off raw silk from cocoons is 4m/min, and the cladding diameter of optical fiber is 440 μ m.Through applying cure cycle on twice line, apply monolateral thickness is 3 μ m at every turn, and after preliminary coating, polyimide coating external diameter is 452 μ m, receives on take-up reel coating processes under pending line.The coating processes parameter 2-1 that sees the following form on line:
Table 2-1
| Parameter name | Numerical value |
| Drawing speed, m/min | 4 |
| The viscosity of polyimide solution, MPa.s | 4000-5500 |
| The size of sizing nib 1, μ m | 477.4 |
| The size of sizing nib 2, μ m | 483.4 |
| Each rear curing time, s of applying | 30 |
| The temperature of curing oven 1, DEG C | 320 |
| The temperature of curing oven 2, DEG C | 400 |
| Curing oven air-supply, exhausting flow, L/min | 60，80 |
Under line, in technique, coating-cure cycle is carried out 2 times, and optical fiber enters hot setting baking oven and is cured after each coating, and apply monolateral thickness is 3 μ m at every turn, and the external diameter of final polyimide coating layer is 470 μ m, and monolateral thickness is 15 μ m.The coating processes parameter 2-2 that sees the following form under line:
Table 2-2
| Parameter name | Numerical value |
| Haulage speed, m/min | 6 |
| The size of sizing nib 3, μ m | 489.5 |
| The size of sizing nib 4, μ m | 495.5 |
| The size of sizing nib 5, μ m | 501.6 |
| Each rear curing time, s of applying | 120 |
| The temperature of hot setting baking oven, DEG C | 370 |
| Curing oven air-supply, exhausting flow, L/min | 130，170 |
Complete after final coating, finished product optical fiber is received and is had mercy on take-up reel.The optical fiber major parameter 2-3 that sees the following form
Table 2-3
| Parameter name | Technical indicator |
| 850nm pad value, dB/km | ≤10 |
| 1064nm pad value, dB/km | ≤10 |
| 1300nm pad value, dB/km | ≤8 |
| Polyimide coating external diameter, μ m | 470±5 |
| Covering/coating concentricity, μ m | ≤5 |
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and instructions, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. a polyimide coated optical fiber, comprise that diameter is the bare fibre of 80-660um and is coated in the coating outside bare fibre, it is characterized in that, described bare fibre is made up of quartzy sandwich layer and the quartzy covering that is looped around outside quartzy sandwich layer, the polyimide coating that the described monolateral thickness of the outer coating of quartzy covering is 10-25um, when described bare fibre quartz cladding diameter is 80-300um, the monolateral thickness of polyimide coating is 10-15um; Described bare fibre core bag is than being 1:1.1, and quartzy cladding diameter is while being 220-660um, and the monolateral thickness of polyimide coating is 15-25um.
2. a kind of polyimide coated optical fiber according to claim 1, is characterized in that, when described bare fibre quartz cladding diameter is 300-660um, the monolateral thickness of polyimide coating is 15-25um; The density of described polyimide coating is 1.38-1.43g/cm3.
3. a kind of polyimide coated optical fiber according to claim 1, is characterized in that, the glass transition temperature of described polyimide coating is equal to or higher than 350 DEG C; The pulling strengrth of described polyimide coating is equal to or greater than 150MPa.
4. a processing technology of making the polyimide coated optical fiber described in claims 1 to 3 any one, is characterized in that, its processing step is as follows:
(1) after using the clean preform of pure water, and use high-purity gas to make it dry;
(2) preform is carried out on wire-drawing equipment to wire drawing; The melting in pyrographite stove of optical fiber prefabricating nose, and under the traction of gravity and draw-off equipment, form a taper;
(3) cone front end, through the traction of draw-off equipment, through bare fibre examine of diameter instrument, under certain speed of reeling off raw silk from cocoons, obtains the uniform bare fibre of diameter;
(4) wired upper coating unit is installed in bare fibre examine of diameter instrument below, for polyimide solution being coated in to optical fiber outside surface; On line, coating unit comprises: sizing nib, coating bowl and water-bath base; Wherein above applying bowl, be provided with an air intake opening, for being passed into, pure gases at high pressure apply bowl, in water-bath base, be connected with the pure water of uniform temperature, apply bowl and fix by the mode that is placed in water-bath base, and transfer heat to the polyimide solution applying in bowl; At this temperature, the range of viscosities of polyimide solution is 3000MPa.s-9000MPa.s, and typical viscosities is 4000MPa.s-6000MPa.s.
Optical fiber enter apply bowl after through sizing nib, be coated with uniformly last layer polyimide solution at optical fiber outside surface;
(5) optical fiber is after sizing nib, and outside surface applies the uncured polyimide solution of last layer; On described line, below coating unit, wired upper solidification equipment is installed; On line, solidification equipment comprises: resistance-heated furnace, quartz ampoule, supply air system and exhausting system that inwall is column type; Wherein quartz ampoule mates with resistance-heated furnace inwall, and exhausting system is installed above heating furnace, and gas handling system is installed below heating furnace, makes a relatively independent atmosphere of formation in quartz ampoule;
(6) coating unit and solidification equipment totally two covers on line, are alternately installed in series; On line, coating-curing process carries out twice, completes preliminary coating, and its monolateral thickness is less than 50% of final thickness, and the glass transition temperature of coating is higher than 350 DEG C;
(7) preliminary coated fiber is received after take-up reel, be placed on a device with the fine function of automatic releasing, under the effect of the preliminary online lower traction equipment of optical fiber applying, through coating processes under the line of several coating units under line, and solidify in high temperature oven, make optical fiber finally apply external diameter and reach aimed dia, and measure the final external diameter that applies by outer diameter detecting instrument device; Receive afterwards on another take-up reel, complete whole coating processes.
5. processing technology according to claim 4, is characterized in that, in described step (7), under line, coating processes is: hot setting baking oven top has aperture, optical fiber is after coating unit, and outside surface has applied one deck polyimide solution, vertically enters high temperature oven;
High temperature oven inside is provided with guide wheel group, is vertically positioned at coating unit below, and its oblique upper is provided with another guide wheel group;
The optical fiber that is coated with polyimide solution winds the line in two guide wheel group, and typical winding length is 6-15m, and logical long-distance winds the line the duration of extended fiber in high temperature oven, makes the state of cure of coating higher;
Optical fiber after solidifying, by the deflecting roller in high temperature oven, is drawn high temperature oven, then through a deflecting roller, be introduced in next coating unit and apply, corresponding with this coating unit, oven interior is equipped with similar guide wheel group, winds the line curing for applying rear optical fiber in baking oven;
Through coating-curing process repeatedly, the coating thickness of optical fiber reaches desired value, can receive around complete whole coating processes to take-up reel.
6. processing technology according to claim 5, it is characterized in that, the horizontal two ends of described high temperature oven are provided with supply air system and exhausting system, for form non-oxygen atmosphere in high temperature oven, and by polyimide solution solidify time produce solvent molecule take away, improve solidify quality; Air output is 100-150L/min, and exhausting amount is 100-200L/min.
7. according to the processing technology described in claim 4 or 5, it is characterized in that, after applying curing process under line and finishing, optical fiber is by the outer diameter detecting instrument device of a placement vertical with this optical fiber, the instrument that external diameter detects is measured optical fiber external diameter, by the gap of measured value and desired value, control pressure and the bath temperature of high-purity gas in coating unit, apply the effect of external diameter to reach fine setting.
8. according to the processing technology described in claim 4 or 5, it is characterized in that, the speed of reeling off raw silk from cocoons that described step (3) is certain is 5m/min-15m/min.
9. according to the processing technology described in claim 4 or 5, it is characterized in that, in described step (5), described supply air system is introduced non-carrier of oxygen in quartz ampoule, described non-carrier of oxygen is N2, and air output is 40-60L/min, makes the non-oxygen atmosphere of formation in quartz ampoule; The volatile solvent molecule that described exhausting system produces when polyimide coating is solidified is extracted out in time, and exhausting amount is 60-80L/min; Resistance-heated furnace temperature range is 150 DEG C-400 DEG C.
10. processing technology according to claim 7, is characterized in that, the below of solidification equipment on outer diameter detecting instrument device hookup wire for measuring the external diameter of optical fiber after preliminary coating, and shows; In described step (7), the haulage speed of draw-gear is 4-10m/min.
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Application publication date: 20140723 |