CN104556669A - Control method and device for large diameter preform dehydroxylation and vitrification - Google Patents
Control method and device for large diameter preform dehydroxylation and vitrification Download PDFInfo
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- CN104556669A CN104556669A CN201410823707.2A CN201410823707A CN104556669A CN 104556669 A CN104556669 A CN 104556669A CN 201410823707 A CN201410823707 A CN 201410823707A CN 104556669 A CN104556669 A CN 104556669A
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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
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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Abstract
The invention relates to a control method and device for large diameter preform dehydroxylation and vitrification, and relates to a manufacturing method for manufacturing a preform through performing dehydroxylation and vitrification to a large diameter preform in a vertical sintering furnace. The control device comprises a furnace core pipe, an upper exhaust pipe, a lower exhaust pipe, an upper control valve, a lower control valve, an upper gas concentration sensor, an upper gas concentration sensor probe, a lower gas concentration sensor, a lower gas concentration sensor probe and a controller; the upper exhaust pipe is arranged at the upper part of the furnace core pipe; the upper control valve is mounted on the upper exhaust pipe; the lower exhaust pipe is arranged at the lower part of the furnace core pipe; the lower control valve is mounted on the lower exhaust pipe; the upper gas concentration sensor probe mounted at the upper part of the furnace core pipe is connected with the upper gas concentration sensor through a signal line; the lower gas concentration sensor probe mounted at the lower part of the furnace core pipe is connected with the lower gas concentration sensor through a signal line; the upper gas concentration sensor and the lower gas concentration sensor are connected with the controller through the signal lines.
Description
Technical field
What the present invention's a kind of loosening body precasting bar deshydroxy and vitrified control method and control device thereof related to is a kind ofly carries out to loosening body precasting bar the manufacture method that deshydroxy and vitrifying manufacture prefabricated rods in vertical sintering furnace.This control method according to gas concentration in the sintering oven of sensor sensing, can control furnace core tube upper and lower part venting port gas purging amount, thus makes the even concentration sintering furnace gas be distributed in sintering oven upper and lower.By which, the prefabricated rods in the axial direction with uniform properties can be obtained.
Background technology
The manufacture of current preform mainly contains four kinds of methods, be respectively microwave plasma activation vapour deposition process (PCVD), modified chemical vapor deposition process (MCVD) (MCVD), rod outer chemical vapour deposition process (OVD), axial vapor deposition method (VAD).Wherein adopt the loosening body precasting bar of VAD method and OVD method deposition, deshydroxy and During Vitrification in vitro need have been heated by sintering oven again.
Usually with the loosening body precasting bar that VAD method and OVD method obtain, deshydroxy and vitrifying process need be carried out in vertical sintering furnace.The method mainly utilizes the branch of different positions thermograde in sintering oven, at He and Cl
2mixed gas in complete deshydroxy and During Vitrification in vitro simultaneously.Its gas passed into generally passes into from the below of sintering oven, and after stove to be sintered is warming up to design temperature, loosening body precasting bar starts to carry out deshydroxy and During Vitrification in vitro.
Chinese invention patent CN1597581A provides a kind of agglomerating plant and equipment of loose body optical fiber prefabricated rod, and its chief component is: quartzy furnace core tube, process furnace, running gear and supporting sensing device and gas supply device.This device can make loosening body precasting bar complete deshydroxy and During Vitrification in vitro in sintered pipes, and sintering temperature is even, and loosening body precasting bar shrinks evenly.Adopt agglomerating plant in this way, the gas in prefabricated rods manufacturing processed in process furnace and heat are undertaken by thermal convection and diffusion way.In recent years because loosening body precasting bar size is keeping the large-scale development, corresponding process furnace is also keeping the large-scale development, and traditional thermal convection and diffusion way have been difficult to ensure being uniformly distributed of gas concentration and heat in process furnace.
Chinese invention patent CN103771697A provides a kind of sintering method and equipment of large-scale optical fiber prefabricating stick, it is mainly through improving the furnace binding of process furnace, its core is the combined heated mode with graphite heater nested outside quartzy furnace core tube and graphite heat preservation member, to substitute the array mode of nested molybdenum disilicide heating member outside original silica tube.The method is mainly optimized process furnace and improves, and improves the rear prefabricated rods visual appearance of sintering.
Chinese invention patent CN103739194A provides a kind of sintering method and equipment thereof of preform, its advantage is to utilize Laser feedback Controlling System to adjust in real time the temperature of sintering oven in sintering process, to realize carrying out closed-loop control to sintering process.The method can improve the outward appearance condition of prefabricated rods after sintering to a certain extent, but still exists due to the state of Gas concentration distribution inequality in furnace core tube, only less by the improvement of temperature adjustment in prefabricated rods optical parametric.
On the other hand, He has been widely used in the manufacture application of current preform, and He itself belongs to the gas of molecular weight, at high temperature molecular thermalmotion is also more violent, and this also exacerbates the skewness of heat and gas concentration in furnace core tube further.
Due to the heat in sintering oven and gas concentration skewness, the deshydroxy of loosening body precasting bar and During Vitrification in vitro is very easily caused evenly not to carry out, thus the optical property of optical fiber and the visual appearance of prefabricated rods after affecting wire drawing.Therefore, the prefabricated rods completing deshydroxy and During Vitrification in vitro under the state that this Gas concentration distribution is uneven has following 2 deficiencies:
1, process furnace internal upper part gas concentration is on the low side, easily causes loosening body precasting bar deshydroxy not thorough;
2, process furnace inner bottom part entrap bubble easily causes other abnormal generations, causes producing the preform with excellent light-transfer characteristic.
At loosening body precasting bar in deshydroxy process, because free and diffusion easily appears in the uneven fluorine that adulterate in prefabricated rods inside in deshydroxy process of Gas concentration distribution, germanium plasma, affect the optical property of optical fiber after wire drawing, and can not homogenizing carry out due to deshydroxy process, free and the diffusion of prefabricated rods different positions is also different, and this affects the consistence of prefabricated rods axially optical property further.In addition, vitrifying process can not evenly be carried out, and can affect the vitrified homogeneity of prefabricated rods, thus causes the specific refractory power of prefabricated rods different positions covering to change.
Because Gas concentration distribution in furnace core tube is uneven, cause follow-up loosening body precasting bar deshydroxy and vitrified exception thus, the present invention fully takes into account problems of the prior art and deficiency, provides a kind of method that whole furnace core tube various places inside gas concentration is consistent.
Summary of the invention
The object of the invention is to provide a kind of loosening body precasting bar deshydroxy and vitrified control method and control device thereof for above-mentioned weak point, improve vertical sintering furnace and deshydroxy and vitrifying effect are carried out to loosening body precasting bar, improve the optical property of optical fiber after prefabricated stick drawn wire.The present invention respectively has a gas barrier in furnace core tube upper and lower, respectively has a gas concentration sensor below upper air vent, above lower exhaust port.Be primarily characterized in that the free air delivery that can control two gas barrier according to the control signal of gas concentration sensor, thus make the gas concentration of furnace core tube top and bottom keep balance.
A kind of loosening body precasting bar deshydroxy and vitrified control method and control device thereof take following technical scheme to realize:
A kind of loosening body precasting bar deshydroxy and vitrified control device comprise furnace core tube, top vapor pipe, lower exhaust pipe, top control valve, bottom control valve, upper gas concentration inductor block, upper gas concentration inductive probe, lower gas concentration inductor block, lower gas concentration inductor block probe and controller.
Furnace core tube top is provided with top vapor pipe, top vapor pipe is equipped with top control valve, furnace core tube bottom is provided with lower exhaust pipe, lower exhaust pipe is equipped with bottom control valve.
Upper gas concentration inductor block probe is housed on furnace core tube top, and upper gas concentration inductor block probe is connected with upper gas concentration inductor block by signal wire, and upper gas concentration inductor block is connected with controller by signal wire.
Lower gas concentration inductor block probe is housed in furnace core tube bottom, and lower gas concentration inductor block probe is connected with lower gas concentration inductor block by signal wire, and lower gas concentration inductor block is connected with controller by signal wire.Controller is connected with bottom control valve with top control valve respectively by control line.
Described top control valve and bottom control valve adopt magnetic valve.
Described top and the bottom gas concentration inductor block and top and the bottom gas concentration inductor block probe adopt online flow type helium to detect in inductor block GCT-HE-L(mixed gas He content more than 95%).
Described controller adopts PLC.
A kind of loosening body precasting bar deshydroxy and vitrified control method as follows:
After loosening body precasting bar installation, sintering He and Cl
2mixed gas pass into bottom furnace core tube, graphite heater furnace now starts progressively to be warming up to design temperature 1100 ~ 1300 DEG C, and after reaching design temperature, loosening body precasting bar presses setting speed 2.0 ~ 5.0mm/min uniform descent.Process furnace heating member top is cold zone, and temperature range, at 800 ~ 1000 DEG C, carries out deshydroxy process for loosening body precasting bar, is high-temperature zone in the middle part of heating member, and temperature range, at 1100 ~ 1300 DEG C, carries out vitrifying process for loosening body precasting bar.
After passing into gas in process furnace, furnace core tube internal upper part gas concentration inductive probe 9a and lower gas concentration inductor block probe 10a, immediately gas concentration signal is passed to controller to process, if furnace core tube upper gas concentration is higher than furnace core tube lower gas concentration, then controller will increase the folding degree of top control valve, thus the quantity discharged increasing upper gas reduces the gas concentration on furnace core tube top, so repeatedly when furnace core tube top and the bottom gas concentration difference is within 5% and formative dynamics balance, make furnace core tube upper and lower part Cl
2be consistent with He gas concentration.
The present invention is owing to making each position Cl
2concentration is consistent, so loosening body precasting bar deshydroxy process can evenly be carried out from below to up, obtained prefabricated rods each position optical property can ensure unanimously.And keep He uniform concentration distribution in furnace core tube, can ensure that furnace core tube internal heat is evenly distributed, loosening body precasting bar can carry out During Vitrification in vitro by transferring heat uniformly when vitrifying, can improve prefabricated rods visual appearance after vitrifying.
In a kind of loosening body precasting bar deshydroxy of the present invention and vitrified control method and control device thereof, the gas concentration of furnace core tube upper and lower part can equal control, can possess good deshydroxy and vitrifying effect, thus the prefabricated rods of availability excellence.When loosening body precasting bar carries out deshydroxy and vitrifying process, due to the Cl of deshydroxy and vitrifying process
2keep flow state with the mixed gas of He always, Cl in furnace core tube can be affected further after process furnace heats up
2with He concentration distribution, thus make the deshydroxy of loosening body precasting bar different positions and vitrifying effect uneven, affect the optical property of optical fiber and the visual appearance of prefabricated rods after follow-up prefabricated stick drawn wire.And in the present invention, because gas concentration upper and lower in furnace core tube can be consistent, loosening body precasting bar can evenly carry out in deshydroxy and During Vitrification in vitro, thus the optical property of optical fiber and the visual appearance of prefabricated rods after prefabricated stick drawn wire can be improved.
The preform of manufacture of the present invention contrasts the prefabricated rods of other ordinary sinter stoves manufacture, mainly contains following 3 advantages:
1., because top and the bottom gas concentration in furnace core tube is consistent, deshydroxy process is axially evenly carried out from below to up at loosening body precasting bar, and after can making prefabricated stick drawn wire, the optical property of optical fiber is consistent;
2. because top and the bottom gas concentration in furnace core tube is consistent, During Vitrification in vitro axially evenly can carry out from below to up at loosening body precasting bar, and the external diameter of the different positions of prefabricated rods is kept consistency, and improves the visual appearance of prefabricated rods;
3. this invention is conducive to the maximization of follow-up prefabricated rods and development in large size, and the larger then advantage of the present invention of loosening body precasting bar external diameter is more obvious;
Accompanying drawing explanation
Below with reference to accompanying drawing, the invention will be further described:
Fig. 1 is a kind of loosening body precasting bar deshydroxy and vitrified control device schematic diagram.
In figure: 1, graphite heater furnace, 2, furnace core tube, 3, top vapor pipe, 4, lower exhaust pipe, 5, top control valve, 6, bottom control valve, 7, top control valve control line, 8, bottom control valve control line, 9, upper gas concentration sensor, 10, lower gas concentration sensor, 11, controller, 12, loosening body precasting bar, 9a, upper gas concentration inductive probe, 10a, lower gas concentration inductor block are popped one's head in.
Embodiment
A kind of loosening body precasting bar deshydroxy and vitrified control device comprise furnace core tube 2, top vapor pipe 3, lower exhaust pipe 4, top control valve 5, bottom control valve 6, upper gas concentration inductor block 9, upper gas concentration inductive probe 9a, lower gas concentration inductor block 10, lower gas concentration inductor block probe 10a and controller 11.
Furnace core tube 2 top is provided with top vapor pipe 3, top vapor pipe 3 is equipped with top control valve 5, furnace core tube 2 bottom is provided with lower exhaust pipe 4, lower exhaust pipe 4 is equipped with bottom control valve 6.
Upper gas concentration inductor block probe 9a is housed on furnace core tube 2 top, and upper gas concentration inductor block probe 9a is connected with upper gas concentration inductor block 9 by signal wire, and upper gas concentration inductor block 9 is connected with controller 11 by signal wire.
Lower gas concentration inductor block probe 10a is housed in furnace core tube 2 bottom, and lower gas concentration inductor block probe 10a is connected with lower gas concentration inductor block 10 by signal wire, and lower gas concentration inductor block 10 is connected with controller 11 by signal wire.Controller 11 is connected with bottom control valve 6 with top control valve 5 respectively by control line.
Described top control valve 5 and bottom control valve 6 adopt magnetic valve.
Described upper and lower part gas concentration inductor block and upper and lower part gas concentration inductor block probe adopt online flow type helium to detect in inductor block GCT-HE-L(mixed gas He content more than 95%).
Described controller 11 adopts PLC.
A kind of loosening body precasting bar deshydroxy and vitrified control method as follows:
After loosening body precasting bar 12 installation, sintering He and Cl
2mixed gas pass into bottom furnace core tube 2, graphite heater furnace 1 now starts progressively to be warming up to design temperature 1100 ~ 1300 DEG C, and after reaching design temperature, loosening body precasting bar 12 presses setting speed 2.0 ~ 5.0mm/min uniform descent.Process furnace heating member top is cold zone, and temperature range, at 800 ~ 1000 DEG C, carries out deshydroxy process for loosening body precasting bar, is high-temperature zone in the middle part of heating member, and temperature range, at 1100 ~ 1300 DEG C, carries out vitrifying process for loosening body precasting bar.
After passing into gas in graphite heater furnace 1, furnace core tube 2 internal upper part gas concentration inductive probe 9a and lower gas concentration inductor block probe 10a, immediately gas concentration signal is passed to controller 11 to process, if furnace core tube 2 upper gas concentration is higher than furnace core tube 2 lower gas concentration, then controller 11 will increase the folding degree of top control valve 5, thus the quantity discharged increasing upper gas reduces the gas concentration on furnace core tube 2 top, so repeatedly when furnace core tube 2 upper and lower part gas concentration difference is within 5% and formative dynamics balance, make furnace core tube 2 upper and lower part Cl
2be consistent with He gas concentration.
The present invention is owing to making each position Cl
2concentration is consistent, so loosening body precasting bar deshydroxy process can evenly be carried out from below to up, obtained prefabricated rods each position optical property can ensure unanimously.And keep He uniform concentration distribution in furnace core tube, can ensure that furnace core tube internal heat is evenly distributed, loosening body precasting bar can carry out During Vitrification in vitro by transferring heat uniformly when vitrifying, can improve prefabricated rods visual appearance after vitrifying.
The present invention is mainly used in the deshydroxy of loosening body precasting bar and vitrified control method, and concrete treating processes is as follows: after loosening body precasting bar installation, sintering He and Cl
2mixed gas pass into bottom furnace core tube, graphite furnace now starts progressively to be warming up to design temperature (generally at 1100 ~ 1300 DEG C), and after reaching design temperature, loosening body precasting bar presses setting speed (generally at 2.0 ~ 5.0mm/min) uniform descent.Process furnace heating member top is cold zone, and temperature range carries out deshydroxy process at 800 ~ 1000 DEG C for loosening body precasting bar, and be high-temperature zone in the middle part of heating member, temperature range carries out vitrifying process at 1100 ~ 1300 DEG C for loosening body precasting bar.
embodiment 1
Adopt OVD legal system to obtain external diameter φ 240 ± 10mm loosening body precasting bar, after sintering, prefabricated rods target external diameter is φ 120mm, adopts the present invention to carry out deshydroxy and vitrifying process.After loosening body precasting bar installation, start in furnace core tube to pass into He and Cl
2, He flow is 10L/min, Cl
2flow is 400mL/min.
After passing into gas, gas concentration signal in furnace core tube is passed to controller by two concentration inductor block probes immediately, venting port control valve regulates gas concentration in furnace core tube according to control signal by constantly changing folding degree, and 10 ~ 20min can form stable running balance in furnace core tube.
After furnace temperature to be sintered arrives 1200 DEG C, loosening body precasting bar then rotates gradually to drop in sintering oven with the speed of rotation of the lowering speed of 3.0mm/min, 3rpm and carries out deshydroxy and vitrifying, after dropping to preseting length, deshydroxy and During Vitrification in vitro terminate, and stop passing into He and Cl
2.
Production terminates the external diameter of rear prefabricated rods at φ 115 ~ 120, and excellent footpath undulated control is within 5mm, and after wire drawing, parameters distribution is also relatively evenly without significantly suddenling change.
embodiment 2
Adopt OVD legal system to obtain external diameter φ 300 ± 10mm loosening body precasting bar, after sintering, prefabricated rods target external diameter is φ 130mm.After loosening body precasting bar external diameter increases, sintering gas flow also needs suitable increase, and in the present embodiment, He flow is adjusted to 15L/min, Cl
2flow is adjusted to 600mL/min.
After passing into gas, gas concentration signal in furnace core tube is passed to controller by two concentration inductor block probes immediately, and venting port control valve regulates gas concentration in furnace core tube according to control signal by constantly changing folding degree.Due to the increase of loosening body precasting bar external diameter and the increase of gas flow, it reaches the running balance time also can correspondingly increase, and can form stable running balance after about 30 ~ 40min.
After furnace temperature to be sintered reaches 1300 DEG C, loosening body precasting bar rotates gradually to drop in sintering oven with the speed of rotation of the lowering speed of 3.0mm/min, 3rpm and carries out deshydroxy and vitrifying, after dropping to preseting length, deshydroxy and During Vitrification in vitro terminate, and stop passing into He and Cl
2.
Production terminates the external diameter of rear prefabricated rods at φ 125 ~ 130, and excellent footpath undulated control is within 5mm, and after wire drawing, parameters distribution is also relatively evenly without significantly suddenling change.
Claims (4)
1. loosening body precasting bar deshydroxy and a vitrified control device, is characterized in that: comprise furnace core tube, top vapor pipe, lower exhaust pipe, top control valve, bottom control valve, upper gas concentration inductor block, upper gas concentration inductive probe, lower gas concentration inductor block, lower gas concentration inductor block probe and controller;
Furnace core tube top is provided with top vapor pipe, top vapor pipe is equipped with top control valve, furnace core tube bottom is provided with lower exhaust pipe, lower exhaust pipe is equipped with bottom control valve;
Upper gas concentration inductor block probe is housed on furnace core tube top, and upper gas concentration inductor block probe is connected with upper gas concentration inductor block by signal wire, and upper gas concentration inductor block is connected with controller by signal wire;
Lower gas concentration inductor block probe is housed in furnace core tube bottom, and lower gas concentration inductor block probe is connected with lower gas concentration inductor block by signal wire, and lower gas concentration inductor block is connected with controller by signal wire; Controller is connected with bottom control valve with top control valve respectively by control line.
2. a kind of loosening body precasting bar deshydroxy according to claim 1 and vitrified control device, is characterized in that: described top control valve and bottom control valve adopt magnetic valve.
3. a kind of loosening body precasting bar deshydroxy according to claim 1 and vitrified control device, is characterized in that: described controller adopts PLC.
4. loosening body precasting bar deshydroxy and a vitrified control method, is characterized in that:
After loosening body precasting bar installation, sintering He and Cl
2mixed gas pass into bottom furnace core tube, graphite heater furnace now starts progressively to be warming up to design temperature 1100 ~ 1300 DEG C, and after reaching design temperature, loosening body precasting bar presses setting speed 2.0 ~ 5.0mm/min uniform descent; Process furnace heating member top is cold zone, and temperature range, at 800 ~ 1000 DEG C, carries out deshydroxy process for loosening body precasting bar, is high-temperature zone in the middle part of heating member, and temperature range, at 1100 ~ 1300 DEG C, carries out vitrifying process for loosening body precasting bar;
After passing into gas in process furnace, furnace core tube internal upper part gas concentration inductive probe and lower gas concentration inductor block probe, immediately gas concentration signal is passed to controller to process, if furnace core tube upper gas concentration is higher than furnace core tube lower gas concentration, then controller will increase the folding degree of top control valve, thus the quantity discharged increasing upper gas reduces the gas concentration on furnace core tube top, so repeatedly when furnace core tube top and the bottom gas concentration difference is within 5% and formative dynamics balance, make furnace core tube upper and lower part Cl
2be consistent with He gas concentration;
Owing to making each position Cl
2concentration is consistent, so loosening body precasting bar deshydroxy process can evenly be carried out from below to up, obtained prefabricated rods each position optical property can ensure unanimously, and keep He uniform concentration distribution in furnace core tube, can ensure that furnace core tube internal heat is evenly distributed, loosening body precasting bar can carry out During Vitrification in vitro by transferring heat uniformly when vitrifying, can improve prefabricated rods visual appearance after vitrifying.
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|---|---|---|---|
| CN201410823707.2A CN104556669B (en) | 2014-12-26 | 2014-12-26 | Control method and device for large diameter preform dehydroxylation and vitrification |
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|---|---|---|---|
| CN201410823707.2A CN104556669B (en) | 2014-12-26 | 2014-12-26 | Control method and device for large diameter preform dehydroxylation and vitrification |
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|---|---|
| CN104556669A true CN104556669A (en) | 2015-04-29 |
| CN104556669B CN104556669B (en) | 2017-02-22 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105347666A (en) * | 2015-11-30 | 2016-02-24 | 中天科技精密材料有限公司 | Manufacturing method of low-loss optical fiber preformed rod |
| CN110054410A (en) * | 2017-02-28 | 2019-07-26 | 天津富通集团有限公司 | The production technology of large-scale optical fiber prefabricating stick |
| CN111977960A (en) * | 2020-09-04 | 2020-11-24 | 威海长和光导科技有限公司 | Sintering method of optical fiber preform powder body |
| CN112174511A (en) * | 2020-10-26 | 2021-01-05 | 通鼎互联信息股份有限公司 | Sintering device for loose body of optical fiber preform rod and application method thereof |
| CN113248132A (en) * | 2021-07-08 | 2021-08-13 | 藤仓烽火光电材料科技有限公司 | Heating furnace system for producing optical fiber preform and heating method thereof |
| CN115385565A (en) * | 2021-05-21 | 2022-11-25 | 株式会社藤仓 | Glass member heating device, glass member heating method, and optical fiber preform manufacturing method using same |
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| CN103626381A (en) * | 2012-08-27 | 2014-03-12 | 浙江富通光纤技术有限公司 | Graphite furnace for sintering glass loose mass |
| CN204356230U (en) * | 2014-12-26 | 2015-05-27 | 中天科技精密材料有限公司 | A kind of loosening body precasting bar deshydroxy and vitrified control device |
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| CN103626381A (en) * | 2012-08-27 | 2014-03-12 | 浙江富通光纤技术有限公司 | Graphite furnace for sintering glass loose mass |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105347666A (en) * | 2015-11-30 | 2016-02-24 | 中天科技精密材料有限公司 | Manufacturing method of low-loss optical fiber preformed rod |
| CN110054410A (en) * | 2017-02-28 | 2019-07-26 | 天津富通集团有限公司 | The production technology of large-scale optical fiber prefabricating stick |
| CN110054411A (en) * | 2017-02-28 | 2019-07-26 | 天津富通集团有限公司 | High-temperature cabinet for large-scale optical fiber prefabricating stick production technology |
| CN110054410B (en) * | 2017-02-28 | 2021-08-06 | 天津富通集团有限公司 | Production process of large-size optical fiber preform |
| CN110054411B (en) * | 2017-02-28 | 2021-08-06 | 天津富通集团有限公司 | High-temperature box for large-size optical fiber preform production process |
| CN111977960A (en) * | 2020-09-04 | 2020-11-24 | 威海长和光导科技有限公司 | Sintering method of optical fiber preform powder body |
| CN112174511A (en) * | 2020-10-26 | 2021-01-05 | 通鼎互联信息股份有限公司 | Sintering device for loose body of optical fiber preform rod and application method thereof |
| CN112174511B (en) * | 2020-10-26 | 2023-05-09 | 通鼎互联信息股份有限公司 | Sintering device for loose body of optical fiber preform and application method thereof |
| CN115385565A (en) * | 2021-05-21 | 2022-11-25 | 株式会社藤仓 | Glass member heating device, glass member heating method, and optical fiber preform manufacturing method using same |
| CN113248132A (en) * | 2021-07-08 | 2021-08-13 | 藤仓烽火光电材料科技有限公司 | Heating furnace system for producing optical fiber preform and heating method thereof |
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|---|---|
| CN104556669B (en) | 2017-02-22 |
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