CN105384334A - Blowtorch for large-size optical fiber perform manufacturing and large-size optical fiber perform manufacturing method of blowtorch - Google Patents
Blowtorch for large-size optical fiber perform manufacturing and large-size optical fiber perform manufacturing method of blowtorch Download PDFInfo
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- CN105384334A CN105384334A CN201510859745.8A CN201510859745A CN105384334A CN 105384334 A CN105384334 A CN 105384334A CN 201510859745 A CN201510859745 A CN 201510859745A CN 105384334 A CN105384334 A CN 105384334A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention relates to a blowtorch for large-size optical fiber perform manufacturing and a large-size optical fiber perform manufacturing method of the blowtorch. By using the blowtorch and the method, production rate, utilization rate of raw materials can be effectively increased, and the production cost is reduced. The blowtorch for the large-size optical fiber perform manufacturing comprises a raw material central pipe, an inner layer sealing gas blowtorch opening, a burning gas vent, an inner layer combustion-supporting gas vent, an outer layer combustion-supporting gas vent and an outer layer sealing gas blowtorch opening; the raw material central pipe of the blowtorch is a raw material pipe, the outer side of the raw material central pipe is the inner layer sealing gas vent, the outer side of the inner layer sealing gas vent is the burning gas vent, the burning gas vent is internally provided with a circle of inner layer combustion-supporting gas vent concentrical relative to the raw material pipe, the outer side of the inner layer combustion-supporting gas vent is concentrically provided with a circle of outer layer combustion-supporting gas vent, and the outer side of the outer layer combustion-supporting gas vent is the outer layer sealing gas blowtorch opening.
Description
Technical field
The blowtorch that a kind of large-scale optical fiber prefabricating stick manufacturing processed that what a kind of large-scale optical fiber prefabricating stick of the present invention manufacture blowtorch and large-scale optical fiber prefabricating stick manufacture method thereof related to is uses and large-scale optical fiber prefabricating stick manufacture method thereof, use this blowtorch and method can effectively promote throughput rate, utilization rate of raw materials, reduce production cost.
Background technology
For reducing optical fiber production cost, improve sedimentation effect, large-scale optical fiber prefabricating stick becomes the Main way of prefabricated rods technical development simultaneously.
Preform mainly contains four kinds of manufacturing process, i.e. VAD(axial vapor deposition method), OVD(Outside Vapor sedimentation), PCVD(low-temperature plasma vapour deposition process) and MCVD(modified chemical vapor deposition process (MCVD)).
Outside Vapor sedimentation (OVD) is surrounding layer preparation method the most frequently used at present.The sedimentation rate of the method, utilization rate of raw materials are mainly subject to the impact of Blowtorch structure and flow set.The widely used blowtorch of current OVD, due to Blowtorch structure design unreasonable, combustion gases, combustion-supporting gas, starting material cannot fully react, cause sedimentation rate and utilization rate of raw materials lower.
In order to improve the production capacity of preform, sedimentation rate must be promoted.But the increase of sedimentation rate can cause the reduction of sedimentation effect, the production cost of preform is increased.In addition, the reduction of sedimentation effect makes the SiO that is not deposited in deposition chamber on Powder Rod
2particle increases, and causes particulate matter floating in cavity to be attached to the surface of Powder Rod, there is bubble after Powder Rod is sintered in prefabricated rods.
The blowtorch that Outside Vapor sedimentation (OVD) uses, Chinese invention patent not yet relates to.Japanese Patent No.04-243929 discloses a kind of blowtorch with coaxial line multi-pipeline structure, and in the structure shown here, raw material ejiction opening is between combustion gases ejiction opening and combustion-supporting gas ejiction opening.In this blowtorch, ejection combustion gases (H2) and combustion-supporting gas (O2), thus unstripped gas (SiCl4) is clipped between this combustion gases and combustion-supporting gas, makes to form SiO2, the blowtorch sedimentation rate of this kind of structure is slower.
In existing large-scale optical fiber prefabricating stick OVD manufacturing technology, due to Blowtorch structure design and processing parameter setting, output cannot effectively promote, and utilization rate of raw materials is lower simultaneously, has been with loss to enterprise.Therefore, invent a kind of blowlamp, and design best flow matches value, become a problem demanding prompt solution.
Summary of the invention
The present invention seeks to provide a kind of large-scale optical fiber prefabricating stick manufacture blowtorch and large-scale optical fiber prefabricating stick manufacture method thereof for above-mentioned weak point, mainly invent a kind of blowlamp, and according to the pipeline structure of blowtorch and unstripped gas flow velocity, set best raw material, gas flow.This blowlamp, effectively can promote sedimentation rate, the utilization rate of raw materials of blowtorch; Meanwhile, use best raw material, gas flow effectively can reduce number of bubbles in prefabricated rods.
A kind of large-scale optical fiber prefabricating stick manufacture blowtorch and large-scale optical fiber prefabricating stick manufacture method thereof take following technical scheme to realize:
The most general prefabricated rods manufacturing process is axial vapor deposition technique (VAD technique)+outside vapor deposition process (OVD technique) at present, axial vapor deposition technique (VAD technique) is used to prepare plug, the plug prepared uses outside vapor deposition process (OVD technique) at the skin attachment SiO2 powder of plug, form loosening body Powder Rod, Powder Rod forms final transparent prefabricated rods through sintering oven dehydration, vitrifying.
OVD device utilizes the blowtorch relative to, movement to be vertically deposited on by quartz powder on the plug being connected to rod of rotation, and diameter of mandrel is about 50mm, when blowtorch support run back number reach set(ting)value time, equipment stops automatically.The height of Powder Rod sedimentation rate, utilization rate of raw materials depends primarily on project organization and the flow set of blowtorch, the blowtorch that current outside vapor deposition process (OVD technique) uses is limited by the restriction of project organization, and sedimentation rate, utilization rate of raw materials are relatively low; And due to utilization rate of raw materials low, the quartz particles of cavity inner suspension is more, is easily attached on Powder Rod, forms bubble after sintering in prefabricated rods.
A kind of large-scale optical fiber prefabricating stick manufacture blowtorch comprises donor center pipe, internal layer sealed gas blowtorch mouth, combustion gases ejiction opening, internal layer combustion-supporting property gas vent, outer combustion-supporting property gas vent and outer sealed gas blowtorch mouth.
Blowtorch of the present invention is arranged on outsourcing depositing device blowtorch support, and blowtorch moves back and forth, by SiO with blowtorch support in process of production
2particle is attached on plug.The pipe core of blowtorch of the present invention is mother tube, and the outside of mother tube is internal layer sealed gas ejiction opening, for isolated raw material and burning, combustion-supporting gas, prevents raw material in the reaction of blowtorch mouth, blocking blowtorch.The outside of internal layer sealed gas ejiction opening is combustion gases blowtorch mouth, and in combustion gases ejiction opening, arrange a circle internal layer combustion-supporting property gas vent with one heart relative to mother tube, internal layer combustion-supporting property gas vent has identical focal length with mother tube.In the outside of internal layer combustion-supporting property gas vent, arrange the outer combustion-supporting property gas vent of a circle with one heart, have identical focal length with internal layer combustion-supporting property gas vent.The outside of outer combustion-supporting property gas vent is outer sealed gas ejiction opening, for controlling the flame profile of blowtorch, prevents flame from disperseing.
A kind of large-scale optical fiber prefabricating stick manufacture method of the present invention comprises following processing step:
1) use axial vapor deposition technique (VAD technique) to prepare plug, diameter of mandrel is about 50mm;
2) dock at plug two ends rod;
3) plug docking handlebar rod carries out polishing, and the stress of removing docking port, removes the impurity of mandrel surface simultaneously.Polishing flow: H
2: 300L/min, interior O
2: 80L/min, outer O
2: 70L/min;
4) the plug two ends of docking handlebar rod are arranged on the chuck pedestal of depositing device;
5) to the igniting of deposition blowlamp blowtorch, press " automatically operating " button, depositing device chuck pedestal starts to rotate with the rotating speed of 50rpm, and blowtorch starts at mandrel surface deposition SiO with the translational speed of 250mm/min with blowtorch support
2powder, exhaust hood is positioned at directly over blowtorch all the time, identical with the translational speed of blowtorch;
6) blowtorch flow: SiCl in production process
4: 50g/min, H
2: 120L/min, interior O
2: 20L/min, outer O
2: 35L/min, interior Ar:4L/min, outer Ar:20L/min;
7) quartz powder is deposited on the plug being connected to rod of rotation by blowtorch, rotating speed 50rpm, when blowtorch support run back number reach set(ting)value time, deposition terminates, and equipment stops automatically;
8) after Powder Rod deposition terminates, deposition uses blowtorch auto extinguishing, and deposition terminates;
9) Powder Rod carry out dewatering at sintering oven, vitrifying, make large-scale optical fiber prefabricating stick;
10) according to the SiCl consumed in deposition process
4total flux and final prefabricated rods effective weight, prefabricated rods effective weight is gross weight-plug weight-excellent weight, calculates sedimentation rate and utilization rate of raw materials;
11) sinter the transparent prefabricated rods that obtains to observe under the spot light lamp in darkroom and check, the number of bubbles in confirmation covering, in covering, the quantity of bubble is less than 2, and bubble diameter is less than 1mm is salable product.
A kind of large-scale optical fiber prefabricating stick manufacture blowtorch and large-scale optical fiber prefabricating stick manufacture method reasonable in design, can effectively rise sedimentation rate, utilization rate of raw materials; Combine best flow setting value simultaneously, effectively can reduce the quantity of bubble in prefabricated rods.This blowtorch simple structure, cost is suitable with current widely used blowtorch.
The present invention not only can guarantee normally carrying out of production, can also promote sedimentation rate, utilization rate of raw materials, the production capacity of enterprise, reduces enterprise's production cost.Meanwhile, this invention effectively can reduce the quantity of bubble in prefabricated rods, promotes the quality of prefabricated rods, reduces wire drawing and to break fine rate, promote wire drawing qualification rate.
Accompanying drawing explanation
Below with reference to accompanying drawing, the invention will be further described:
Fig. 1 Outside Vapor sedimentation (OVD) manufactures the equipment schematic diagram of preform.
The front view of the nozzle arrangement of Fig. 2 blowtorch of the present invention.
Fig. 3 compares the front view of the nozzle arrangement using blowtorch in comparative example 1.
Fig. 4 embodiment 1 and the relation compared between the delivery rate of the raw material in comparative example 1 and sedimentation effect are comparatively schemed.
Embodiment
The most general prefabricated rods manufacturing process is axial vapor deposition technique (VAD technique)+outside vapor deposition process (OVD technique) at present, use axial vapor deposition technique (VAD technique) to prepare plug, the plug prepared uses outside vapor deposition process (OVD technique) at the skin attachment SiO of plug
2powder, forms loosening body Powder Rod, and Powder Rod forms final transparent prefabricated rods through sintering oven dehydration, vitrifying.
OVD device utilizes the blowtorch relative to, movement to be vertically deposited on by quartz powder on the plug being connected to rod of rotation, and diameter of mandrel is about 50mm, when blowtorch support run back number reach set(ting)value time, equipment stops automatically.The height of Powder Rod sedimentation rate, efficiency, utilization rate of raw materials depends primarily on project organization and the flow set of blowtorch, the blowtorch that current outside vapor deposition process (OVD technique) uses is limited by the restriction of project organization, and sedimentation rate, utilization rate of raw materials are relatively low; And due to utilization rate of raw materials low, the quartz particles of cavity inner suspension is more, is easily attached on Powder Rod, forms bubble after sintering in prefabricated rods.
With reference to accompanying drawing 1 ~ 4, a kind of large-scale optical fiber prefabricating stick manufacture blowtorch comprises donor center pipe 6, the ejection of internal layer sealed gas (lamp) mouth 7, combustion gases ejiction opening 8, internal layer combustion-supporting property gas vent 9, outer combustion-supporting property gas vent 10, outer sealed gas blowtorch mouth 11.
Blowtorch 4 of the present invention is arranged on outsourcing depositing device blowtorch support 5, and blowtorch 4 moves back and forth, by SiO with blowtorch support 5 in process of production
2particle is attached on plug 1.The pipe core of blowtorch of the present invention is donor center pipe 6, and the outside of donor center pipe 6 is internal layer sealed gas ejiction opening 7, for isolated raw material and burning, combustion-supporting gas, prevents raw material in the reaction of blowtorch mouth, blocking blowtorch.The outside of internal layer sealed gas ejiction opening 7 is combustion gases ejiction opening 8, in combustion gases ejiction opening 8, arrange a circle internal layer combustion-supporting property gas vent 9 with one heart relative to mother tube 6, internal layer combustion-supporting property gas vent 9 has identical focal length with donor center pipe 6.At internal layer combustion-supporting property gas vent 9(internal layer combustion-supporting property gas vent 9) outside, with one heart arrange one circle outer combustion-supporting property gas vent 10, have identical focal length with internal layer combustion-supporting property gas vent 9.The outside of outer combustion-supporting property gas vent 10 is outer sealed gas ejiction opening 11, for controlling the flame profile of blowtorch, prevents flame from disperseing.
A kind of large-scale optical fiber prefabricating stick manufacture method of the present invention comprises following processing step:
1) use axial vapor deposition technique (VAD technique) to prepare plug 1, diameter of mandrel is about 50mm;
2) dock at plug 1 two ends rod 2;
3) plug 1 docking handlebar rod 2 carries out polishing, and the stress of removing docking port, removes the impurity of mandrel surface simultaneously.Polishing flow: H
2: 300L/min, interior O
2: 80L/min, outer O
2: 70L/min;
4) plug 1 two ends of docking handlebar rod 2 are arranged on the chuck pedestal 3 of depositing device;
5) to the igniting of deposition blowlamp 4 blowtorch, press " automatically operating " button, depositing device chuck pedestal 3 starts to rotate with the rotating speed of 50rpm, and blowtorch 4 starts at plug 1 surface deposition SiO with the translational speed of 250mm/min with blowtorch support 5
2powder, exhaust hood 12 is positioned at directly over blowtorch 4 all the time, identical with the translational speed of blowtorch;
6) blowtorch 4 flow: SiCl in production process
4: 50g/min, H
2: 120L/min, interior O
2: 20L/min, outer O
2: 35L/min, interior Ar:4L/min, outer Ar:20L/min;
7) blowtorch 4 quartz powder is deposited on rotation be connected to rod 2 plug 1 on, rotating speed 50rpm, when blowtorch support 5 runs back number reach set(ting)value time, deposit end, equipment stops automatically;
8) after Powder Rod deposition terminates, deposition blowtorch 4 auto extinguishing, deposition terminates;
9) Powder Rod carry out dewatering at sintering oven, vitrifying, make large-scale optical fiber prefabricating stick;
10) according to the SiCl consumed in deposition process
4total flux and final prefabricated rods effective weight, prefabricated rods effective weight is gross weight-plug weight-excellent weight, calculates sedimentation rate and utilization rate of raw materials;
11) sinter the transparent prefabricated rods that obtains to observe under the spot light lamp in darkroom and check, the number of bubbles in confirmation covering, in covering, the quantity of bubble is less than 2, and bubble diameter is less than 1mm is salable product.
Embodiment 1
Adopt VAD technique to prepare plug, after being extended by plug, test its refractive index profile, by test result calculations surrounding layer aequum.
The plug tested is in two ends docking rod, and docking carries out polishing after rod to plug, removes the stress because docking produces.The plug of the band handlebar rod that polishing completes is called branch rod, selects suitable target to return number according to test result, adopts OVD method to deposit surrounding layer on plug, and finally obtained target external diameter is the Powder Rod of 400mm.
The mother tube 6 of blowtorch of the present invention supplies SiCl
4+ O
2, internal layer sealed gas ejiction opening 7 supplies Ar, and combustion gases blowtorch mouth 8 supplies H
2, internal layer combustion-supporting property gas vent 9 supplies O
2, outer combustion-supporting property gas vent 10 supplies O
2, outer sealed gas ejiction opening 11 supplies Ar.
Table 1 lists the kind of the gas being supplied to each nozzle, flow and flow velocity and each air-flow in its distance of exit in the radial direction of nozzle separately
The Powder Rod that deposition terminates carries out dewatering at sintering oven, vitrifying, obtains transparent prefabricated rods.Transparent prefabricated rods is observed under the spot light lamp in darkroom, bubble-free in covering.
According to the SiCl consumed in deposition process
4total flux and final prefabricated rods effective weight (gross weight-plug weight-excellent weight), calculate sedimentation rate and utilization rate of raw materials:
Sedimentation rate 97g/min, utilization rate of raw materials 71%.
Embodiment 2
Adopt the blowtorch identical with embodiment 1 and OVD technique.The mother tube 6 of the present embodiment blowtorch supplies SiCl
4+ H
2, other blowtorch pipeline supply gas is identical with embodiment 1.
Table 2 lists the kind of the gas being supplied to each nozzle, flow and flow velocity and each air-flow in its distance of exit in the radial direction of nozzle separately
The Powder Rod that deposition terminates carries out dewatering at sintering oven, vitrifying, obtains transparent prefabricated rods.Transparent prefabricated rods is observed under the spot light lamp in darkroom, bubble-free in covering.
According to the SiCl consumed in deposition process
4total flux and final prefabricated rods effective weight (gross weight-plug weight-excellent weight), calculate sedimentation rate and utilization rate of raw materials:
Sedimentation rate 95g/min, utilization rate of raw materials 69%.
Comparative example 1
Blowtorch used in comparative example 1 is five layers of pipeline structure, as Fig. 3.Wherein pipe core 13 supplies SiCl
4+ O
2, pipe 14 supplies Ar, and pipe 15 supplies H
2, pipe 16 supplies O
2, pipe 17 supplies Ar.The air-flow thickness of pipe 13, pipe 14 is respectively 2.6mm, 2.5mm, is greater than embodiment 1,2.Comparative example 1 OVD technique used is identical with embodiment 1.
Table 3 lists the kind of the gas being supplied to each nozzle, flow and flow velocity and each air-flow in its distance of exit in the radial direction of nozzle separately
| Blowtorch pipeline is numbered | The gas used | Flow (SLM) | Flow velocity (m/s) | The thickness (mm) of air-flow |
| 13 | SiCl 4+O 2 | 50+10 | 38.00 | 2.6 |
| 14 | Ar | 4 | 2.67 | 1.0 |
| 15 | H 2 | 120 | 18.84 | 2.5 |
| 16 | O 2 | 55 | 5.19 | 2.0 |
| 17 | Ar | 20 | 5.33 | 1.0 |
The Powder Rod that deposition terminates carries out dewatering at sintering oven, vitrifying, obtains transparent prefabricated rods.Transparent prefabricated rods is observed under the spot light lamp in darkroom, has 2 bubbles in covering, and the diameter <1mm of bubble.
According to the SiCl consumed in deposition process
4total flux and final prefabricated rods effective weight (gross weight-plug weight-excellent weight), calculate sedimentation rate and utilization rate of raw materials:
Sedimentation rate 81g/min, utilization rate of raw materials 54%.
Contrast
Raw material SiCl in embodiment 1
4with combustion-supporting gas O
2the flow of mixed gas identical with comparative example 1 with flow velocity.But the thickness of air-flow is 1.0mm in embodiment 1, and the thickness of air-flow is 2.6mm in comparative example 1, that is: in embodiment 1, the thickness of air-flow is obviously less than the thickness of comparative example 1 (embodiment 2 is identical with embodiment 1).Therefore, in embodiment 1 and embodiment 2, raw material promptly can mix with the combustion gases sprayed from other nozzle and combustion-supporting gas, thus facilitation of hydrolysis reaction.Therefore, the sedimentation rate in embodiment 1 and 2 brings up to 97g/min and 95g/min respectively, higher than the 81g/min in comparative example 1; Utilization rate of raw materials brings up to 71% and 69% respectively, higher than 54% in comparative example 1.
When changing the raw material SiCl in embodiment 1 and comparative example 1 respectively
4delivery rate time, the sedimentation effect in embodiment 1 is with the increase only slight fluctuations of delivery rate, and the sedimentation effect in comparative example 1 significantly declines along with the increase of delivery rate, as Fig. 4.
Therefore, according to the present invention, sedimentation rate, the utilization rate of raw materials of preform can be improved significantly, enterprise production capacity, reduce enterprise's production cost; Meanwhile, in prefabricated rods, the quantity of bubble obviously reduces, and the quality of prefabricated rods is promoted.
Claims (3)
1. a large-scale optical fiber prefabricating stick manufacture blowtorch, is characterized in that: comprise donor center pipe, internal layer sealed gas blowtorch mouth, combustion gases ejiction opening, internal layer combustion-supporting property gas vent, outer combustion-supporting property gas vent and outer sealed gas blowtorch mouth;
The donor center pipe of blowtorch is mother tube, the outside of donor center pipe is internal layer sealed gas ejiction opening, for isolated raw material and burning, combustion-supporting gas, prevent raw material from reacting at blowtorch mouth, blocking blowtorch, the outside of internal layer sealed gas ejiction opening is combustion gases blowtorch mouth, in combustion gases ejiction opening, arrange a circle internal layer combustion-supporting property gas vent with one heart relative to mother tube, internal layer combustion-supporting property gas vent has identical focal length with donor center pipe; In the outside of internal layer combustion-supporting property gas vent, arrange the outer combustion-supporting property gas vent of a circle with one heart, identical focal length is had with internal layer combustion-supporting property gas vent, the outside of outer combustion-supporting property gas vent is outer sealed gas ejiction opening, for controlling the flame profile of blowtorch, prevent flame from disperseing.
2. a kind of large-scale optical fiber prefabricating stick manufacture blowtorch according to claim 1, is characterized in that: blowtorch is arranged on outsourcing depositing device blowtorch support, and blowtorch moves back and forth, by SiO with blowtorch support in process of production
2particle is attached on plug.
3. a large-scale optical fiber prefabricating stick manufacture method, is characterized in that: comprise following processing step:
Use axial vapor deposition technique to prepare plug, diameter of mandrel is about 50mm;
In the docking of plug two ends rod;
The plug of docking handlebar rod carries out polishing, and the stress of removing docking port, removes the impurity of mandrel surface, polishing flow: H simultaneously
2: 300L/min, interior O
2: 80L/min, outer O
2: 70L/min;
The plug two ends of docking handlebar rod are arranged on the chuck pedestal of depositing device;
To deposition blowlamp igniting, press " automatically operating " button, depositing device chuck pedestal starts to rotate with the rotating speed of 50rpm, and blowtorch starts at mandrel surface deposition SiO with the translational speed of 250mm/min with blowtorch support
2powder, exhaust hood is positioned at directly over blowtorch all the time, identical with the translational speed of blowtorch;
Blowtorch flow: SiCl in production process
4: 50g/min, H
2: 120L/min, interior O
2: 20L/min, outer O
2: 35L/min, interior Ar:4L/min, outer Ar:20L/min;
Quartz powder is deposited on the plug being connected to rod of rotation by blowtorch, rotating speed 50rpm, when blowtorch support run back number reach set(ting)value time, deposition terminates, and equipment stops automatically;
After Powder Rod deposition terminates, deposition uses blowtorch auto extinguishing, and deposition terminates;
Powder Rod carries out dewatering at sintering oven, vitrifying, makes large-scale optical fiber prefabricating stick.
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|---|---|---|---|
| CN201510859745.8A CN105384334B (en) | 2015-11-30 | 2015-11-30 | A kind of large-scale optical fiber prefabricating stick manufacture blowtorch and its large-scale optical fiber prefabricating stick manufacturing method |
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| CN106904822A (en) * | 2017-02-24 | 2017-06-30 | 天津富通集团有限公司 | The manufacture method of preform |
| CN106904822B (en) * | 2017-02-24 | 2019-05-24 | 天津富通集团有限公司 | The manufacturing method of preform |
| CN106881365A (en) * | 2017-02-27 | 2017-06-23 | 天津富通集团有限公司 | Prefabricated rods processing method |
| CN106881365B (en) * | 2017-02-27 | 2018-10-12 | 天津富通集团有限公司 | Prefabricated rods processing method |
| CN106904823A (en) * | 2017-02-28 | 2017-06-30 | 天津富通集团有限公司 | The production technology and its large-scale optical fiber prefabricating stick of large-scale optical fiber prefabricating stick |
| CN108818305A (en) * | 2017-05-04 | 2018-11-16 | 中天科技精密材料有限公司 | Quartz pushrod clamp structure and clamp method, dress stick platform |
| CN110221383B (en) * | 2019-07-12 | 2023-07-07 | 杭州金星通光纤科技有限公司 | Single-mode optical fiber and manufacturing method thereof |
| CN110221383A (en) * | 2019-07-12 | 2019-09-10 | 杭州金星通光纤科技有限公司 | A kind of single mode optical fiber and its manufacturing method |
| CN110372201A (en) * | 2019-08-02 | 2019-10-25 | 杭州永特信息技术有限公司 | A kind of large scale, high deposition rate preform blowtorch and its loose manufacturing method |
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