CN116462404A - Method for manufacturing optical fiber - Google Patents
Method for manufacturing optical fiber Download PDFInfo
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- CN116462404A CN116462404A CN202211389462.8A CN202211389462A CN116462404A CN 116462404 A CN116462404 A CN 116462404A CN 202211389462 A CN202211389462 A CN 202211389462A CN 116462404 A CN116462404 A CN 116462404A
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- optical fiber
- heating furnace
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- manufacturing
- increasing
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 184
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 113
- 239000000463 material Substances 0.000 claims abstract description 44
- 238000005491 wire drawing Methods 0.000 claims abstract description 17
- 230000000630 rising effect Effects 0.000 abstract 1
- 239000003365 glass fiber Substances 0.000 description 15
- 239000011347 resin Substances 0.000 description 15
- 229920005989 resin Polymers 0.000 description 15
- 230000006866 deterioration Effects 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/0253—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/105—Organic claddings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/106—Single coatings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/24—Coatings containing organic materials
- C03C25/26—Macromolecular compounds or prepolymers
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/40—Monitoring or regulating the draw tension or draw rate
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/72—Controlling or measuring the draw furnace temperature
Abstract
To suppress a decrease in yield in the process of increasing the wire drawing speed. [ solution ] A method for manufacturing an optical fiber by drawing an optical fiber base material heated in a heating furnace. The manufacturing method of the optical fiber comprises the following steps: a linear velocity increasing step of increasing the drawing velocity of the drawn optical fiber base material to a predetermined drawing velocity and simultaneously drawing the optical fiber base material; and a product manufacturing step of manufacturing an optical fiber serving as a product while drawing the optical fiber base material at a predetermined drawing speed after the linear velocity increasing step. The line speed rising step includes: a first linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace based on the set temperature of the heating furnace in the product manufacturing step; and a second linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace so that the drawing tension of the optical fiber becomes the target drawing tension of the optical fiber to be manufactured in the product manufacturing step after the first linear velocity increasing step. The set temperature of the heating furnace in the product manufacturing step is set based on the temperature of the heating furnace in the product manufacturing step at the time of conventional optical fiber manufacturing.
Description
Technical Field
The present disclosure relates to a method of manufacturing an optical fiber.
Background
Patent document 1 discloses a method for manufacturing an optical fiber, in which an optical fiber preform is drawn to form a glass fiber, and the outer periphery of the glass fiber is coated with a resin, thereby manufacturing an optical fiber. In this method for producing an optical fiber, the cut-off wavelength of the glass fiber is set to a predetermined value by controlling the drawing tension generated in the glass fiber when drawing the optical fiber base material.
Patent document 2 discloses a method for manufacturing an optical fiber, comprising: a linear velocity increasing step of increasing the drawing velocity from the initial drawing velocity to the target drawing velocity and simultaneously drawing the optical fiber base material; and a constant drawing step of drawing the optical fiber base material under the conditions of the target drawing speed and the target drawing tension. In this optical fiber manufacturing method, in the wire speed increasing step, the drawing tension is maintained at the target drawing tension while the drawing speed is being increased from the initial drawing speed to the target drawing speed, thereby manufacturing an optical fiber having desired characteristics while the drawing speed is being increased.
Prior art literature
Patent literature
Patent document 1 Japanese patent laid-open publication No. 2005-314118
[ patent document 2] Japanese patent application laid-open No. 2005-263545
Disclosure of Invention
[ problem to be solved by the invention ]
The purpose of the present disclosure is to provide a method for manufacturing an optical fiber, wherein the reduction of the yield is suppressed during the drawing speed increase.
[ means for solving the problems ]
The method for manufacturing an optical fiber of the present disclosure is a method for manufacturing an optical fiber by drawing an optical fiber base material heated in a heating furnace, comprising:
a linear velocity increasing step of increasing a drawing velocity of the optical fiber base material to a predetermined drawing velocity while drawing the optical fiber base material; and
a product manufacturing step of manufacturing the optical fiber serving as a product while drawing the optical fiber base material at the predetermined drawing speed after the line speed increasing step,
the line speed increasing step includes:
a first linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace based on the set temperature of the heating furnace in the product manufacturing step; and
a second linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace so that the drawing tension of the optical fiber becomes the target drawing tension of the optical fiber to be manufactured in the product manufacturing step after the first linear velocity increasing step,
the set temperature of the heating furnace in the product manufacturing step is set based on the temperature of the heating furnace in the product manufacturing step in the conventional optical fiber manufacturing.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present disclosure, a method for manufacturing an optical fiber in which a decrease in yield is suppressed during an increase in drawing speed can be provided.
Drawings
Fig. 1 is a conceptual diagram showing the structure of an optical fiber manufacturing apparatus according to one embodiment.
Fig. 2 is a diagram for explaining a method of manufacturing an optical fiber according to an embodiment.
Fig. 3 is a graph showing a relationship between a difference in drawing tension of an optical fiber and a difference in temperature of a heating furnace that varies depending on the difference in drawing tension in a product manufacturing process of an optical fiber.
Description of symbols
1: optical fiber manufacturing apparatus
2: heating furnace
3: resin coating device
4: resin curing device
5: pickup device
5a: belt with a belt body
5b: roller
6: coiling device
7: tension measuring device
8: control device
9: feeder (feeder)
10: guide roller
a: correction coefficient
G: optical fiber base material
G1: glass fiber
And G2: optical fiber Δs: differential motion
t0: time of day
t1: time of day
t2: time of day
t3: time of day
T0: temperature (temperature)
T1: temperature (temperature)
Ta: temperature (temperature)
Tb: setting the temperature
Δt: temperature difference
V: drawing speed
V1: drawing speed
Detailed Description
[ description of embodiments of the present disclosure ]
First, the contents of the embodiments of the present disclosure are described.
The method of manufacturing the optical fiber of the present disclosure is,
(1) A method for manufacturing an optical fiber by drawing an optical fiber base material heated in a heating furnace, comprising:
a linear velocity increasing step of increasing a drawing velocity of the optical fiber base material to a predetermined drawing velocity while drawing the optical fiber base material; and
a product manufacturing step of manufacturing the optical fiber serving as a product while drawing the optical fiber base material at the predetermined drawing speed after the line speed increasing step,
the line speed increasing step includes:
a first linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace based on the set temperature of the heating furnace in the product manufacturing step; and
a second linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace so that the drawing tension of the optical fiber becomes the target drawing tension of the optical fiber to be manufactured in the product manufacturing step after the first linear velocity increasing step,
the set temperature of the heating furnace in the product manufacturing step is set based on the temperature of the heating furnace in the product manufacturing step in the conventional optical fiber manufacturing.
The temperature of the heating furnace in the product manufacturing step is set to a temperature at which an optical fiber having a desired characteristic (e.g., cut-off wavelength) can be manufactured. However, when the same set temperature is used for drawing the optical fiber base material each time, the temperature distribution inside the heating furnace may change due to aged deterioration of the heating furnace, and thus the characteristics of the manufactured optical fiber may change. In this case, for example, it is conceivable to change the set temperature of the heating furnace to control the drawing tension of the optical fiber so that the optical fiber to be manufactured has desired characteristics. However, when an extreme temperature fluctuation of the heating furnace occurs due to the drawing tension control, an extreme fluctuation of the glass melting amount is caused, and an overshoot (overschot) or undershort (undershort) of the drawing speed occurs. According to the above configuration, the set temperature of the heating furnace in the product manufacturing step is determined based on the temperature of the heating furnace in the product manufacturing step in the conventional optical fiber manufacturing. This makes it possible to suppress extreme temperature fluctuations of the heating furnace even when the drawing tension is controlled, as a temperature distribution in which the influence of deterioration of the heating furnace is eliminated in advance. In addition, in the wire speed increasing step, since the wire drawing tension is controlled after the temperature of the heating furnace is increased, it is possible to suppress an extreme temperature fluctuation of the heating furnace due to the wire drawing tension control. Therefore, the wire drawing speed can be stably increased during the wire drawing speed increasing process, and the reduction of the yield can be suppressed.
(2) The temperature of the heating furnace in the product manufacturing step in the conventional optical fiber manufacturing may be a temperature of the heating furnace at the time of starting the manufacturing of the optical fiber serving as a product in the product manufacturing step in the conventional optical fiber manufacturing.
According to the above configuration, since the temperature of the heating furnace at the time of starting the production of the optical fiber serving as a product is used, the temperature immediately after the line speed is increased can be used as the set temperature of the heating furnace.
(3) The set temperature Tb of the heating furnace in the product manufacturing step, the temperature T0 of the heating furnace in the product manufacturing step at the time of the conventional optical fiber manufacturing, the difference Δs between the target drawing tension of the optical fiber to be manufactured in the product manufacturing step and the drawing tension of the optical fiber manufactured in the product manufacturing step at the time of the conventional optical fiber manufacturing, and the correction coefficient a may satisfy a relationship of Δt=aΔ S, tb =t0+Δt.
Since the characteristics of the optical fiber base material vary from one optical fiber base material to another, the drawing tension for producing an optical fiber having desired characteristics also varies. In addition, the temperature of the heating furnace in the product manufacturing step reflects the drawing tension corresponding to the characteristics of the optical fiber to be manufactured. According to the above configuration, since the drawing tension that changes due to the variation in the characteristics of the optical fiber base material is taken into account in advance in the calculation of the set temperature Tb of the heating furnace, even if the drawing tension is controlled in the second linear velocity increasing step, the extreme temperature fluctuation of the heating furnace can be suppressed.
(4) The first wire speed increasing step may be performed in a section in which the wire speed V at the wire speed increasing step and the predetermined wire speed V1 in the product manufacturing step satisfy a relationship of V < v1×0.6.
According to the above configuration, by increasing the temperature of the heating furnace before the drawing tension control is performed, it is possible to suppress an extreme temperature variation of the heating furnace due to the drawing tension control.
(5) The second wire speed increasing step may be performed in a section in which the wire drawing speed V at the wire speed increasing step and the predetermined wire drawing speed V1 at the product manufacturing step satisfy a relationship of v1×0.6 v+.v.ltoreq.v1.
When the drawing tension starts to be controlled at a low drawing speed (V < v1×0.6), the drawing tension drops excessively, the optical fiber falls off from the guide roller of the optical fiber manufacturing apparatus, or the amplitude of the vibration of the optical fiber becomes large to come into contact with the apparatus, and the strength of the optical fiber becomes low, possibly causing breakage. According to the above configuration, since the drawing tension control is performed in the section satisfying V.gtoreq.v1x0.6, occurrence of breakage of the optical fiber can be suppressed. On the other hand, since the drawing tension control is performed in the section where v.ltoreq.v1 is satisfied, the production of the optical fiber serving as a product can be started immediately after the predetermined drawing speed is reached.
Detailed description of embodiments of the disclosure
Specific examples of the method for manufacturing an optical fiber according to the embodiment of the present disclosure will be described below with reference to the drawings. It is intended that the invention not be limited to these examples, but be represented by the claims and that it is intended to include all variations within the meaning and scope equivalent to the claims. In the drawings used in the following description, the scale is appropriately changed so that each member has a recognizable size.
(optical fiber manufacturing apparatus)
Fig. 1 is a schematic diagram showing a configuration of an optical fiber manufacturing apparatus 1 according to the present embodiment. The optical fiber manufacturing apparatus 1 is configured to: the optical fiber G2 is manufactured by drawing the optical fiber base material G to form a glass fiber G1 and coating the outer periphery of the glass fiber G1 with a resin. The optical fiber base material G is an optical fiber base material containing quartz glass as a main component, for example.
The optical fiber manufacturing apparatus 1 includes: a heating furnace 2, a resin coating device 3, a resin curing device 4, a pickup device 5, a winding device 6, a tension measuring device 7, and a control device 8.
The heating furnace 2 is configured to heat and soften the lower end portion of the optical fiber preform G. The optical fiber preform G is inserted into the heating furnace 2 by the feeder 9 and conveyed downward. The glass fiber G1 is formed by elongating the lower end portion of the optical fiber base material G softened by heating to a small size.
The resin coating device 3 and the resin curing device 4 are disposed downstream of the heating furnace 2 in the traveling direction (lower side in fig. 1) of the glass fiber G1. The resin is applied around the glass fiber G1 by the resin application device 3, and is cured by the resin curing device 4. Thereby, an optical fiber G2 in which a resin is formed around the glass fiber G1 is formed.
The pickup device 5 is configured to: the optical fiber G2 is picked up via the guide roller 10 and conveyed to the winding device 6. For example, the pickup device 5 has a belt 5a and a roller 5b. The optical fiber G2 is picked up by the rotation of the ribbon 5a and the rotation of the roller 5b. The winding device 6 is configured to wind the optical fiber G2 fed from the pickup device 5. For example, the winding device 6 winds the optical fiber G2 while rotating.
The tension measuring device 7 is disposed near the guide roller 10. The tension measuring device 7 is configured to measure the drawing tension generated in the optical fiber G2. For example, the tension measuring device 7 measures the drawing tension of the optical fiber G2 by measuring the load applied to the guide roller 10 by the optical fiber G2.
The control device 8 is electrically connected to the heating furnace 2, the pickup device 5, and the like, and is configured to control the temperature of the heating furnace 2, the pickup speed of the optical fiber G2 of the pickup device 5 (drawing speed of the optical fiber base material G), and the like.
(method for producing optical fiber)
Next, a method of manufacturing an optical fiber manufactured by using the optical fiber manufacturing apparatus 1 will be described with reference to fig. 2.
As illustrated in fig. 2, when the production of the preceding optical fiber is completed, a new optical fiber preform G is set in the optical fiber manufacturing apparatus 1, and a threading operation of the glass fiber G1 into the optical fiber manufacturing apparatus 1 is performed. Specifically, the optical fiber base material G is inserted into the heating furnace 2 by the feeder 9, and the lower end portion of the optical fiber base material G is heated by the heating furnace 2. The glass gob melted by heating falls (seeds fall) from the heating furnace 2 by its own weight. The glass gob falling from the heating furnace 2 is drawn into glass fibers G1 having a predetermined glass diameter and reduced in diameter. The reduced diameter glass fiber G1 passes through the resin coating device 3 and the resin curing device 4, is hung on the pickup device 5, and is wound around the winding device 6.
Next, the drawing operation of the optical fiber preform G is performed. As shown in the upper example of fig. 2, the drawing operation of the optical fiber preform G includes a linear velocity increasing step (time t1 to time t 3) and a product manufacturing step (time t3 to time). In the linear velocity increasing step, the optical fiber base material G is drawn while increasing the drawing velocity of the optical fiber base material G to a predetermined drawing velocity V1. Specifically, the optical fiber G2 is picked up by the pickup device 5 at time t1, and the drawing of the optical fiber base material G is performed while the drawing speed of the optical fiber base material G is increased from zero to a predetermined drawing speed V1.
The line speed increasing step includes a first line speed increasing step (time t1 to time t 2) and a second line speed increasing step (time t2 to time t 3). In the first linear velocity increasing step, the drawing velocity is increased while controlling the temperature of the heating furnace 2 based on the set temperature Tb of the heating furnace 2 in the product manufacturing step.
Specifically, as illustrated in the lower stage of fig. 2, the temperature of the heating furnace 2 is controlled to rise from the temperature Ta at the start of the linear velocity increasing step to the set temperature Tb.
The set temperature Tb of the heating furnace 2 is set based on the temperature T0 of the heating furnace in the product manufacturing step at the time of the previous optical fiber manufacturing. For example, the control device 8 acquires a measured value of the temperature of the heating furnace 2 in the product manufacturing step at the time of the previous optical fiber manufacturing from a temperature measuring device (not shown) provided in the heating furnace 2, and calculates the set temperature Tb based on the measured value.
In the second linear velocity increasing step, after the first linear velocity increasing step, the drawing velocity is increased while controlling the temperature of the heating furnace 2 so that the drawing tension of the optical fiber becomes the target drawing tension of the optical fiber to be manufactured in the product manufacturing step. For example, the control device 8 controls the temperature of the heating furnace based on the measurement result of the drawing tension generated in the optical fiber G2 from the tension measuring device 7 so that the measurement result becomes the target drawing tension. In fig. 2, T1 represents the temperature of the heating furnace 2 at the time of drawing tension control. The target drawing tension of the optical fiber is appropriately set according to the characteristics of the optical fiber to be manufactured.
In the product manufacturing step, after the wire speed increasing step, the optical fiber G2 having desired characteristics for use as a product is manufactured while drawing the optical fiber base material G at a predetermined drawing speed V1. Specifically, as illustrated in the upper stage of fig. 2, the optical fiber preform G is drawn while maintaining the predetermined drawing speed V1 (constant linear velocity) after the drawing speed V reaches the predetermined drawing speed V1 at time t 3. Then, the optical fiber G2 having the desired characteristics is used as a product (product acquisition).
In this way, since the set temperature Tb of the heating furnace 2 in the product manufacturing step is determined based on the temperature T0 of the heating furnace at the time of the conventional optical fiber manufacturing, it is possible to suppress an extreme temperature variation of the heating furnace 2 due to the influence of the deterioration of the heating furnace 2. That is, the set temperature of the heating furnace 2 in the product manufacturing step is set to a temperature at which an optical fiber having a desired characteristic (for example, cut-off wavelength) can be manufactured. However, when the same set temperature is used for drawing the optical fiber base material each time, the temperature distribution inside the heating furnace 2 may change due to aged deterioration of the heating furnace 2, and thus the characteristics of the manufactured optical fiber may change. In this case, for example, it is considered to control the drawing tension of the optical fiber so that the optical fiber to be manufactured has desired characteristics. However, when an extreme temperature fluctuation of the heating furnace 2 occurs due to the drawing tension control, an overshoot or undershoot of the drawing speed occurs. In contrast, as described above, in the present embodiment, the set temperature Tb of the heating furnace 2 in the product manufacturing step is determined based on the temperature T0 of the heating furnace 2 at the time of conventional optical fiber manufacturing, and therefore, it is possible to suppress an extreme temperature fluctuation of the heating furnace due to the influence of the deterioration of the heating furnace. In addition, in the wire speed increasing step, since the wire drawing tension is controlled after the temperature of the heating furnace 2 is increased, it is possible to suppress an extreme temperature variation of the heating furnace 2 due to the wire drawing tension control. Therefore, the wire drawing speed can be stably increased during the wire drawing speed increasing process, and the reduction of the yield can be suppressed.
In the present embodiment, as the temperature of the heating furnace in the product manufacturing step at the time of manufacturing the conventional optical fiber, the temperature T0 of the heating furnace in the product manufacturing step used at the time of drawing the optical fiber base material immediately before is used. Thus, the influence of the recent aged deterioration of the heating furnace 2 can be reflected in the set temperature Tb of the heating furnace 2.
As shown in fig. 2, as the temperature T0 of the heating furnace in the product manufacturing step at the time of the previous optical fiber manufacturing, the temperature of the heating furnace 2 at the time of starting the manufacturing of the optical fiber serving as the product in the product manufacturing step at the time of the previous optical fiber manufacturing (time T0) may be used. Thus, the temperature immediately after the rise of the linear velocity can be used as the set temperature Tb of the heating furnace 2.
In addition, as illustrated in fig. 2, the set temperature Tb may be set to satisfy a relationship of tb=t0+Δt, where Δt=aΔs. Δs is the difference (Δs=i1-I0) between the target drawing tension I1 of the optical fiber to be manufactured in the product manufacturing step and the drawing tension I0 of the optical fiber manufactured in the product manufacturing step at the time of the previous optical fiber manufacturing. a (< 0) is a correction coefficient, and is appropriately set in accordance with deterioration of the heater, the core tube, the heat insulating material, and the like of the heating furnace 2. Fig. 3 illustrates a relationship between a difference Δs (g) in drawing tension of an optical fiber and a difference Δt (c) in temperature of the heating furnace 2, which varies due to the difference in drawing tension, in the product manufacturing step of an optical fiber. For example, as shown in fig. 3, when the difference between the drawing tension and the drawing tension in the previous optical fiber product manufacturing step is S1 (Δs=s1), the difference Δt between the temperatures of the heating furnace 2 that varies due to the difference S1 in the drawing tension is Δt=a×s1. Therefore, the set temperature Tb is set to satisfy tb=t0+Δt.
Since the characteristics of the optical fiber base material vary from one optical fiber base material to another, the drawing tension for producing an optical fiber having desired characteristics also varies. In addition, the temperature of the heating furnace in the product manufacturing step reflects the drawing tension corresponding to the characteristics of the optical fiber to be manufactured. As described above, in the calculation of the set temperature Tb of the heating furnace 2, the drawing tension that varies due to the variation in the characteristics of the optical fiber base material is taken into consideration in advance, so that the extreme temperature variation of the heating furnace can be suppressed.
In addition, as illustrated in fig. 2, the first wire speed increasing step may be performed in a section in which the wire drawing speed V at the wire speed increasing step and the predetermined wire drawing speed V1 in the product manufacturing step satisfy a relationship of V < v1×0.6. According to this configuration, by increasing the temperature of the heating furnace before the drawing tension control is performed, it is possible to suppress an extreme temperature variation of the heating furnace due to the drawing tension control.
As illustrated in fig. 2, the second wire speed increasing step may be performed in a section in which the wire drawing speed V at the wire speed increasing step and the predetermined wire drawing speed V1 at the product manufacturing step satisfy the relationship of v1×0.6V Σv1.
When the drawing tension control is started at a low drawing speed (V < v1×0.6), the drawing tension is excessively reduced, and the optical fiber is separated from the guide roller 10 of the optical fiber manufacturing apparatus 1, or the amplitude of the optical fiber vibration is increased to come into contact with the apparatus, and the optical fiber strength is lowered, which may cause breakage. As described above, in the present embodiment, since the drawing tension control is performed in the section satisfying v+.v1×0.6, occurrence of breakage of the optical fiber can be suppressed. On the other hand, since the drawing tension control is performed in the section where v.ltoreq.v1 is satisfied, the production of the optical fiber serving as a product can be started immediately after the predetermined drawing speed is reached.
While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof. The number, position, shape, and the like of the constituent members described above are not limited to the above embodiment, and may be changed to the number, position, shape, and the like preferable for the implementation of the present invention.
In the above embodiment, the temperature T0 of the heating furnace in the product manufacturing step at the time of the previous optical fiber manufacturing is used as the temperature of the heating furnace 2 in the product manufacturing step at the time of the previous optical fiber manufacturing. However, the temperature of the heating furnace in the product manufacturing step at the time of the conventional optical fiber manufacturing such as the first two, the first three, the first four, or the first five may be used, or an average value of these temperatures may be used. Alternatively, the temperature of the heating furnace in the product manufacturing step when manufacturing the optical fiber using the same kind of optical fiber base material may be used among the temperatures of the heating furnace in the product manufacturing step in the conventional optical fiber manufacturing. By using the same type of optical fiber base material, variations in drawing tension due to variations in characteristics of the optical fiber base material are reduced, and extreme temperature fluctuations of the heating furnace can be suppressed.
In the above embodiment, the set temperature Tb is set to satisfy the relationship of tb=t0+Δt, where Δt=aΔs. However, for example, the set temperature Tb may be set to the temperature T0 of the heating furnace in the product manufacturing step at the time of the previous optical fiber manufacturing. Even in this case, it is possible to suppress an extreme temperature variation of the heating furnace caused by the influence of deterioration of the heating furnace.
In the above embodiment, the tension measuring device 7 is disposed in the vicinity of the guide roller 10. However, the tension measuring device 7 may be disposed between the heating furnace 2 and the resin coating device 3. For example, the tension measuring device 7 is an optical device and is configured to measure the drawing tension generated in the glass fiber G1 during drawing.
Claims (5)
1. A method for manufacturing an optical fiber by drawing an optical fiber base material heated in a heating furnace, comprising:
a linear velocity increasing step of increasing a drawing velocity of the optical fiber base material to a predetermined drawing velocity while drawing the optical fiber base material; and
a product manufacturing step of manufacturing the optical fiber serving as a product while drawing the optical fiber base material at the predetermined drawing speed after the line speed increasing step,
the line speed increasing step includes:
a first linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace based on the set temperature of the heating furnace in the product manufacturing step; and
a second linear velocity increasing step of increasing the drawing velocity while controlling the temperature of the heating furnace so that the drawing tension of the optical fiber becomes the target drawing tension of the optical fiber to be manufactured in the product manufacturing step after the first linear velocity increasing step,
the set temperature of the heating furnace in the product manufacturing step is set based on the temperature of the heating furnace in the product manufacturing step in the conventional optical fiber manufacturing.
2. The method for manufacturing an optical fiber according to claim 1, wherein,
the temperature of the heating furnace in the product manufacturing step at the time of manufacturing the conventional optical fiber is the temperature of the heating furnace at the time of starting manufacturing the optical fiber serving as the product in the product manufacturing step at the time of manufacturing the conventional optical fiber.
3. The method for manufacturing an optical fiber according to claim 1 or claim 2, wherein,
the set temperature Tb of the heating furnace in the product manufacturing step, the temperature T0 of the heating furnace in the product manufacturing step at the time of the conventional optical fiber manufacturing, the difference Δs between the target drawing tension of the optical fiber to be manufactured in the product manufacturing step and the drawing tension of the optical fiber manufactured in the product manufacturing step at the time of the conventional optical fiber manufacturing, and the correction coefficient a satisfy the relationship of Δt=aΔ S, tb =t0+Δt.
4. The method for producing an optical fiber according to claim 1 to claim 3, wherein,
the first wire speed increasing step is performed in a section in which the wire speed V at the wire speed increasing step and the predetermined wire speed V1 at the product manufacturing step satisfy a relationship of V < v1×0.6.
5. The method for manufacturing an optical fiber according to any one of claim 1 to claim 4, wherein,
the second wire speed increasing step is performed in a section in which the wire drawing speed V at the wire speed increasing step and the predetermined wire drawing speed V1 at the product manufacturing step satisfy a relationship of V1 x 0.6.ltoreq.V.ltoreq.V 1.
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| JP2022002353A JP2023102029A (en) | 2022-01-11 | 2022-01-11 | Method for manufacturing optical fiber |
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