WO2022224798A1 - 光ファイバの製造方法 - Google Patents
光ファイバの製造方法 Download PDFInfo
- Publication number
- WO2022224798A1 WO2022224798A1 PCT/JP2022/016563 JP2022016563W WO2022224798A1 WO 2022224798 A1 WO2022224798 A1 WO 2022224798A1 JP 2022016563 W JP2022016563 W JP 2022016563W WO 2022224798 A1 WO2022224798 A1 WO 2022224798A1
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- WIPO (PCT)
- Prior art keywords
- speed
- resin
- glass fiber
- coating
- thickness
- Prior art date
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 52
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 184
- 229920005989 resin Polymers 0.000 claims abstract description 184
- 239000003365 glass fiber Substances 0.000 claims abstract description 115
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000011521 glass Substances 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims description 77
- 238000000576 coating method Methods 0.000 claims description 77
- 238000004804 winding Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 3
- 238000005253 cladding Methods 0.000 abstract 3
- 238000001816 cooling Methods 0.000 description 7
- 210000002445 nipple Anatomy 0.000 description 7
- 230000002950 deficient Effects 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000012681 fiber drawing Methods 0.000 description 1
- 230000001678 irradiating effect Effects 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
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Images
Classifications
-
- 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
- C03C25/1065—Multiple 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
Definitions
- the present disclosure relates to an optical fiber manufacturing method.
- the method of manufacturing an optical fiber is usually configured such that an optical fiber preform is drawn, a glass fiber is formed, a resin is applied to the outer circumference of the glass fiber, the resin is cured by ultraviolet irradiation, and the glass fiber is wound. After drawing is started, the speed (drawing speed) of the glass fiber is increased and the speed of the glass fiber is maintained at a predetermined steady production drawing speed. Also, the resin is applied to the glass fiber with a constant thickness.
- Patent Documents 1 and 2 describe an example of an optical fiber drawing method. For example, Patent Literature 1 describes adjusting the resin supply pressure according to the line speed.
- a method for manufacturing an optical fiber according to the present disclosure is a method for manufacturing an optical fiber by applying a first resin to a glass fiber drawn from a glass preform and curing the first resin to form a first coating, a first step of running the glass fiber at a first speed during a first period; and increasing the speed of the glass fiber from the first speed to a second speed during a second period following the first period. a second step; and a third step of maintaining the speed of the glass fiber at the second speed in a third period following the second period, wherein the second step includes: TB1 is the thickness of the first coating from the start of coating until it reaches the third speed, which is faster than the first speed and slower than the second speed, and TB2 is the thickness of the first coating in the third step. , TB2/TB1 is greater than 1.0 and less than or equal to 11.0.
- FIG. 1 is a schematic diagram showing an optical fiber manufacturing apparatus.
- FIG. 2 is a cross-sectional view of the resin coating device.
- FIG. 3 is a diagram showing side by side changes in the speed of the glass fiber and changes in the thicknesses of the first resin and the second resin in the optical fiber manufacturing method according to the embodiment.
- FIG. 4 is a cross-sectional view of an optical fiber when manufacturing a good part.
- FIG. 5 is a diagram showing the relationship between the thickness ratio and the disconnection probability.
- An object of the present disclosure is to provide an optical fiber manufacturing method that can reduce the waste of resin while avoiding the occurrence of disconnection.
- a method for manufacturing an optical fiber according to an aspect of the present disclosure applies a first resin to a glass fiber drawn from a glass base material, and hardens the first resin to form an optical fiber with a first coating. wherein the glass fiber is run at a first speed during a first period; and the speed of the glass fiber is run at the first speed during a second period following the first period.
- the second step the thickness of the first coating from the start of application of the first resin to the third speed faster than the first speed and slower than the second speed is TB1, and the thickness of the first coating in the third step is When the thickness of one coating is TB2, TB2/TB1 is greater than 1.0 and less than or equal to 11.0.
- the thickness TB1 of the first coating from the start of application of the first resin in the second step to the third speed higher than the first speed and lower than the second speed is applied to the glass fiber in the third step.
- the ratio of the thickness TB2 of the first coating is greater than 1.0. That is, the first resin applied to the glass fibers in the second step is less than the first resin applied to the glass fibers in the third step. Therefore, it is possible to reduce the amount of the first resin contained in the defective portion removed from the optical fiber, thereby reducing waste. Further, if the above ratio TB2/TB1 is 11.0 or less, as is clear from experiments by the inventors of the present application, even if the amount of the first resin is reduced, breakage during the increase in the speed of the glass fiber does not occur. can be suppressed.
- the thickness of the first coating may be adjusted by adjusting the application pressure of the first resin onto the glass fiber. In this case, it is easy to adjust the thickness of the first resin with high accuracy.
- the third speed may be 0.95 times or less of the second speed. In this case, it is easy to stably apply the first resin from when the speed of the glass fiber reaches the third speed until it reaches the second speed, and it is easy to suppress the occurrence of disconnection.
- the amount of increase in the thickness of the first coating per 10 seconds from when the speed of the glass fiber reaches the third speed until it reaches the second speed may be up to 1.00 ⁇ m. In this case, it is easy to stably apply the first resin, and it is easy to suppress the occurrence of disconnection.
- the first step is to move the tip of the glass fiber through a first die and a second die in the direction of movement of the glass fiber relative to the second die.
- the tip of the glass fiber can be hung on the take-up device and the take-up device.
- the first die is filled with the first resin before the wire threading step, and the glass fiber is coated with the first resin in the wire threading step. good. In this case, it is not necessary to replace the first die every time the glass base material is replaced, and even if air bubbles are mixed in the first resin in the first die, the speed of the glass fiber is increased. Air bubbles are easy to escape.
- the second die is filled with the second resin before the wire winding step, and the glass fiber is filled with the second resin in the wire winding step. may be applied.
- a method for manufacturing an optical fiber according to another aspect of the present disclosure applies a first resin to a glass fiber drawn from a glass base material, and hardens the first resin to form a first coating.
- a method for manufacturing an optical fiber comprising a first step of running the glass fiber at a first speed during a first period; a second step of increasing the speed from a first speed to a second speed; and a third step of maintaining the speed of the glass fiber at the second speed during a third period following the second period;
- the thickness of the first coating from the start of the application of the first resin to the third speed faster than the first speed and slower than the second speed is TB1, and in the third step
- the thickness of the first coating is TB2, TB2/TB1 is greater than 1.0 and not more than 11.0, and in the second step, the speed of the glass fiber is 0.2 times the second speed.
- the maximum increase in the thickness of the first coating per 10 seconds is 1.00 ⁇ m.
- the ratio TB2/TB1 is greater than 1.0 and 11.0 or less, waste of resin can be reduced while avoiding disconnection. In addition, it is easy to suppress entrainment of air bubbles between the first resin and the glass fiber. Furthermore, it is easy to stably apply the first resin, and it is easy to suppress the occurrence of disconnection.
- FIG. 1 is a schematic diagram showing an optical fiber manufacturing apparatus.
- the optical fiber preform 1 is first heated in the drawing furnace 2, thereby melting the lower end portion of the optical fiber preform 1 and drawing it. be.
- the glass fiber G1 formed by drawing passes through a cooling device 8 provided downstream of the drawing furnace 2 in the running direction of the glass fiber G1 (the direction of arrow A in FIG. 1) to the resin coating device. Pass 3.
- the outer diameter of the glass fiber G1 is adjusted to be smaller than the first die hole 31a of the first die 31 and the second die hole 32a of the second die 32, which will be described later.
- the optical fiber preform 1 is an example of a glass preform.
- the resin coating device 3 is connected with a resin supply device 10 that supplies resin to be coated on the glass fiber G1. As the glass fiber G1 passes through the resin coating device 3, two layers of resin are coated on the outer periphery of the glass fiber G1.
- the resin-coated glass fiber G1 passes through a resin curing device 4 (for example, an ultraviolet irradiation device, etc.) provided downstream of the resin coating device 3, thereby curing the resin and forming an optical fiber G2.
- the optical fiber G2 is wound around the winding drum 7 via the guide roller 5 and the capstan 6 .
- the capstan 6 is an example of a take-up device
- the winding drum 7 is an example of a winding device.
- FIG. 2 is a cross-sectional view of an example resin coating device.
- the resin coating device 3 includes a first die 31 for coating the outer periphery of the glass fiber G1 with the first resin 21 and a second die 32 for coating the second resin 22 on the outer periphery of the first resin 21. and have.
- the first die 31 and the second die 32 are assembled integrally.
- the resin coating device 3 is a device that collectively applies the first resin 21 and the second resin 22 around the glass fiber G1. Also good.
- the first die 31 is formed in a substantially cylindrical shape, and is provided with a first die hole 31a for passing the glass fiber G1 and the first resin 21 at its center.
- the first die hole 31a has, for example, a tapered shape at the upstream side and the same shape at the downstream side.
- the second die 32 is formed in a substantially cylindrical shape, and is provided with a second die hole 32a for passing the glass fiber G1 coated with the first resin 21 and the second resin 22 in the center thereof.
- the second die hole 32a is formed, for example, in a tapered shape in the upstream portion and in the same shape in the downstream portion.
- the second die 32 is arranged downstream of the first die 31 .
- a second connecting channel 32b forming a part of the channel through which the second resin 22 flows is formed.
- the second connection channel 32b is formed so as to be continuous with the second die hole 32a.
- a nipple 33 for guiding the glass fiber G1 to the first die 31 is provided on the upstream side of the first die 31 .
- the nipple 33 is formed in a substantially cylindrical shape, and is provided with a tapered through hole 33a through which the glass fiber G1 is passed in the central portion thereof.
- a first connection channel 33 b that forms a part of the channel through which the first resin 21 flows is formed in the lower portion of the nipple 33 .
- the first connection channel 33b is formed so as to be continuous with the through hole 33a.
- a cylindrical die holder 34 is provided around the nipple 33 , the first die 31 and the second die 32 .
- the nipple 33, the first die 31, and the second die 32 are housed in the die holder 34 with their outer peripheral surfaces fitted to the inner peripheral surface of the die holder 34 without gaps.
- a gap formed between the first connection channel 33b of the nipple 33 and the upper surface of the first die 31 functions as a first resin channel 35 through which the first resin 21 flows.
- a gap formed between the lower surface of the first die 31 and the second connection channel 32b of the second die 32 is configured to function as a second resin channel 36 through which the second resin 22 flows. .
- a through hole 37 communicating with the first resin channel 35 and a through hole 38 communicating with the second resin channel 36 are formed in the side wall portion of the die holder 34 .
- the second resin flow path 36 is positioned downstream of the first resin flow path 35 in the running direction of the glass fiber G1.
- a tip side of a first resin supply pipe 39 for supplying the first resin 21 is connected to the through hole 37 .
- the proximal end of the first resin supply pipe 39 is connected to the first resin supply source of the resin supply device 10 (see FIG. 1).
- the distal end side of a second resin supply pipe 40 for supplying the second resin 22 is connected to the through hole 38 .
- the base end side of the second resin supply pipe 40 is connected to the second resin supply source of the resin supply device 10 .
- the first resin 21 is supplied from the resin supply device 10 to the first resin flow path 35 through the first resin supply pipe 39 and the through hole 37 , and is supplied from the resin supply device 10 through the second resin supply pipe 40 and the through hole 38 .
- the second resin 22 is supplied to the second resin flow path 36 .
- the first resin 21 is applied to the glass fiber G1 using the first die 31, the first resin channel 35 of which is filled with the first resin 21, and the second resin channel 36 is filled with the second resin 22.
- a second die 32 is used to apply the second resin 22 to the glass fiber G1.
- the first resin 21 and the second resin 22 are, for example, ultraviolet curable resins, and are cured by irradiating ultraviolet rays after coating.
- FIG. 3 is a diagram showing side by side changes in the velocity (linear velocity) V of the glass fiber and changes in the thicknesses of the first coating and the second coating applied to the glass fiber in the optical fiber manufacturing method according to the embodiment; is.
- the horizontal axis in FIG. 3 indicates time t.
- a velocity V of the glass fiber G1 in FIG. The thickness TB of the first coating and the thickness TC of the second coating in FIG.
- the change in the velocity V of the glass fiber G1 will be explained.
- the tip of the glass fiber G1 is hooked on the capstan 6 via the cooling device 8, the resin coating device 3, the resin curing device 4, and the guide roller 5.
- the glass fiber G1 is drawn from the lower end of the base material 1, and the speed V of the glass fiber G1 is maintained at the speed V1 until time t2. Note that the speed V1 does not have to be constant, and may fluctuate slightly.
- Time t1 is the time at which the application of the second resin 22 is started as will be described later.
- the optical fiber G2 coated with the resin is threaded from the capstan 6 to the take-up drum 7, It is wound up on the winding drum 7 .
- the speed V of the glass fiber G1 increases to the speed V2 from time t2 to time t5.
- the speed V of the glass fiber G1 is maintained at the speed V2.
- the speed V2 is the steady production linear speed, and the optical fiber G2 is wound as a good part after time t5.
- the speed V2 is, for example, about 2000 m/min or more and 3000 m/min or less. Further, the optical fiber G2 wound between the time t0 and the time t5 is discarded as a defective part in a subsequent process.
- the period from time t0 to time t2 is an example of a first period
- the period from time t2 to time t5 is an example of a second period
- the period after time t5 is an example of a third period.
- the speed V1 is an example of a first speed
- the speed V2 is an example of a second speed.
- the application amount of the first resin 21 is the same as that of the first coating until time t4 when the speed V of the glass fiber G1 is higher than the speed V1 and lower than the speed V2. is adjusted so that the thickness TB of is equal to the thickness TB1.
- a relationship of "1.0 ⁇ TB2/TB1 ⁇ 11.0" holds between the thickness TB1 and the thickness TB2. That is, the thickness TB1 is a thickness that has a ratio of greater than 1.0 to 11.0 or less to the thickness TB2.
- the first resin 21 and the second resin 22 are collectively applied to the glass fiber G1.
- the thickness TB1 does not need to be constant, and may vary as long as the relationship "1.0 ⁇ TB2/TB1 ⁇ 11.0" holds.
- the thickness TB1 may be controlled to gradually increase.
- Velocity V3 is an example of a third velocity.
- the application amount of the first resin 21 increases from time t4 to time t5 so that the thickness TB of the first coating reaches the thickness TB2 at time t5.
- FIG. 4 is a cross-sectional view of the optical fiber G2 when manufacturing a good portion.
- the first coating in the good part is indicated by reference numeral 21X and the second coating is indicated by reference numeral 22X.
- the first resin 21 and the second resin 22 applied to the glass fiber G1 are cured in the resin curing device 4 by irradiation with ultraviolet rays.
- the first resin 21 and the second resin 22 applied between the time t1 and the time t5 are smaller and thinner than the first resin 21 and the second resin 22 applied after the time t5. Therefore, the power of the ultraviolet rays for curing the first resin 21 and the second resin 22 applied between the time t1 and the time t5 is the same as the power of the first resin 21 and the second resin 22 applied after the time t5. may be lower than the power of the UV light for curing the By lowering the power, effects such as reduction in power consumption, extension of the life of the ultraviolet light source, suppression of fogging of the quartz tube in the resin curing device 4, and the like can be obtained.
- the first resin 21 is not applied from time t0 to time t3, and the thickness between thickness TB1 and thickness TB2 is not applied from time t3 to time t4. Since the relationship “1.0 ⁇ TB2/TB1” holds, the amount of the first resin 21 applied can be small. Therefore, the amount of the first resin 21 applied to the defective portion can be reduced. preferable. Further, as will be described later, the relationship "TB2/TB1 ⁇ 11.0" holds between the thickness TB1 of the first coating in the defective portion and the thickness TB2 of the first coating in the good portion. It is possible to suppress the occurrence of wire breakage while reducing the coating amount of the first resin 21 included.
- the glass fiber is passed through the die and the resin is applied before the die is filled with the resin.
- the wire may be passed in a state in which the resin 22 is filled. Normally, the die is replaced each time the glass base material is replaced. By doing so, the first die 31 and the second die 32 do not have to be replaced when drawing the next glass base material.
- the operation rate of the optical fiber manufacturing apparatus 100 can be maintained at a high level.
- the first resin 21 may be thinly applied to the glass fiber G1 during wire threading. By doing so, even if air bubbles are mixed in the first resin 21 in the first die 31, the air bubbles are easily removed while the line speed is increasing.
- the second resin 22 may be thinly applied to the glass fiber G1 during threading. By doing so, even if air bubbles are mixed in the second resin 22 in the second die 32, the air bubbles are easily removed while the line speed is increasing.
- the thickness TB of the first coating can be adjusted according to the coating conditions of the first resin 21 in the resin coating device 3, for example.
- the thickness TB of the first coating may be adjusted by changing the cooling conditions in the cooling device 8, and adjusted by changing the cooling conditions in the cooling device 8 and the coating conditions of the first resin 21 in the resin coating device 3. You may
- the speed Vp of the glass fiber G1 at time t3 when the application of the first resin 21 is started is preferably 0.2 times or less of the speed V2. That is, it is preferable to start applying the first resin 21 to the glass fiber G1 when the speed V of the glass fiber G1 is 0.2 times or less the speed V2. Further, the speed Vp of the glass fiber G1 at the time t3 when the application of the first resin 21 is started is more preferably 0.1 times or less of the speed V2. Note that the lower limit of the speed Vp is the speed V1.
- the time for the speed V to rise from the speed V3 to the speed V2, that is, the time between the time t4 and the time t5 is shortened. Therefore, if the thickness TB1 of the first coating at time t4 is significantly smaller than the thickness TB2, for example, about 0.1 times, the thickness TB of the first coating can be reduced from the thickness TB1 to the thickness TB2 in a short time. As a result, the application of the first resin 21 becomes unstable and disconnection is likely to occur. For example, if the speed V3 is more than 0.95 times the speed V2, disconnection may easily occur.
- the speed V3 is preferably 0.95 times or less, more preferably 0.90 times or less, and even more preferably 0.80 times or less, the speed V2. In order to obtain the effect of reducing waste of resin, it is preferable that the speed V3 is about 0.5 times or more the speed V2.
- the amount of increase in the thickness TB of the first coating per 10 seconds is preferably 1.00 ⁇ m at maximum, more preferably 0.80 ⁇ m or less, and more preferably 0.60 ⁇ m. More preferably: For example, even if the first resin 21 is supplied stepwise and there is a moment when the thickness TB of the first coating suddenly rises, the amount of rise in 10 seconds including that moment should be 1.00 ⁇ m or less. is preferred. In order to obtain the effect of reducing waste of resin, it is preferable that the amount of increase in the thickness TB of the first coating per 10 seconds is 0.10 ⁇ m or more.
- the thickness TB of the first coating and the thickness TC of the second coating change linearly. It doesn't have to be targeted.
- optical fibers were manufactured under a plurality of conditions in which the ratio of thickness TB2 to thickness TB1 (TB2/TB1) was varied by a method following the above embodiment. Then, the disconnection occurrence probability was investigated for each condition.
- the disconnection occurrence probability referred to here is the rate (%) of the number of times disconnection occurred during the increase in linear velocity.
- the results are shown in FIG.
- the horizontal axis of FIG. 5 indicates the ratio (TB2/TB1) of the thickness TB2 to the thickness TB1, and the vertical axis indicates the disconnection occurrence probability.
- the ratio (TB2/TB1) is 11.0 or less, the disconnection occurrence probability was as low as 20% or less. Further, when the ratio (TB2/TB1) was 10.0 or less, the breakage probability was even lower, about 10% or less. Therefore, the ratio (TB2/TB1) is preferably 10.0 or less.
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Abstract
Description
光ファイバを線引きする際、ガラスファイバの速度(線速)が定常製造線速に達するまでは、伝送特性が予め定められた良好範囲から外れやすいため、通常この部分は不良部として光ファイバの良好部から取り除かれ、廃棄される。このため、ガラスファイバの速度が定常製造線速に達するまでに塗布された樹脂は無駄になる。このような不良部の樹脂の塗布量を減らせば樹脂の無駄を省くことが可能であるが、単純に塗布量を減らしただけでは、ガラスファイバが外気に触れて、傷が入りやすくなり、線速の上昇中に断線が生じるおそれがある。線速上昇中に断線すると、光ファイバ母材の口出し作業から再度始める必要があり、歩留まりが大幅に低下する。
本開示によれば、断線の発生を避けながら樹脂の無駄を低減できる。
最初に本開示の実施態様を列記して説明する。
以下、本開示の実施形態について詳細に説明するが、本実施形態はこれらに限定されるものではない。なお、本明細書及び図面において、実質的に同一の機能構成を有する構成要素については、同一の符号を付することにより重複した説明を省くことがある。
2:線引炉
3:樹脂塗布装置
4:樹脂硬化装置
5:ガイドローラ
6:キャプスタン
7:ドラム
8:冷却装置
10:樹脂供給装置
21:第1樹脂
21X:第1被覆
22:第2樹脂
22X:第2被覆
31:第1ダイス
31a:第1ダイ孔
32:第2ダイス
32a:第2ダイ孔
32b:第2接続流路
33:ニップル
33a:孔
33b:第1接続流路
34:ダイスホルダ
35:第1樹脂流路
36:第2樹脂流路
37:貫通孔
38:貫通孔
39:第1樹脂供給管
40:第2樹脂供給管
100:製造装置
A:矢印
G1:ガラスファイバ
G2:光ファイバ
TC1、TB1、TB2:厚さ
Claims (9)
- ガラス母材から線引きされたガラスファイバに第1樹脂を塗布し、前記第1樹脂を硬化させることによって第1被覆とする光ファイバの製造方法であって、
前記ガラスファイバを、第1期間において、第1速度で走行させる第1工程と、
前記ガラスファイバの速度を、前記第1期間に続く第2期間において、前記第1速度から第2速度に上昇させる第2工程と、
前記ガラスファイバの速度を、前記第2期間に続く第3期間において、前記第2速度に維持する第3工程と、
を有し、
前記第2工程において、前記第1樹脂の塗布を開始してから、前記第1速度より速く前記第2速度より遅い第3速度に達するまでの前記第1被覆の厚さをTB1、前記第3工程における前記第1被覆の厚さをTB2としたとき、TB2/TB1は、1.0より大きく11.0以下である光ファイバの製造方法。 - 前記第2工程において、前記ガラスファイバへの前記第1樹脂の塗布圧力を調整することによって、前記第1被覆の厚さを調整する請求項1に記載の光ファイバの製造方法。
- 前記第2工程において、前記ガラスファイバの速度が前記第2速度の0.2倍以下である時に、前記第1樹脂の前記ガラスファイバへの塗布を開始する請求項1または請求項2に記載の光ファイバの製造方法。
- 前記第3速度は、前記第2速度の0.95倍以下である請求項1から請求項3のいずれか1項に記載の光ファイバの製造方法。
- 前記ガラスファイバの速度が、前記第3速度に達してから前記第2速度に達するまでの、前記第1被覆の厚さの10秒間あたりの増加量は、最大で1.00μmである請求項1から請求項4のいずれか1項に記載の光ファイバの製造方法。
- 前記第1工程は、前記ガラスファイバの先端を、第1ダイス及び第2ダイスを経由して、前記第2ダイスよりも前記ガラスファイバの進行方向の下流側に配置された引取り装置に掛ける線通し工程を有し、
前記第2工程は、
第2樹脂を前記第2ダイスにより前記ガラスファイバの外側に塗布する工程と、
前記第2樹脂が塗布された前記ガラスファイバの先端を、前記引取り装置よりも前記ガラスファイバの進行方向の下流側に配置された巻取り装置に掛ける線掛け工程と、
を有する請求項1から請求項5のいずれか1項に記載の光ファイバの製造方法。 - 前記線掛け工程の前に、前記第1ダイスに前記第1樹脂が充填されており、
前記線掛け工程において、前記ガラスファイバに前記第1樹脂が塗布される請求項6に記載の光ファイバの製造方法。 - 前記線掛け工程の前に、前記第2ダイスに前記第2樹脂が充填されており、
前記線掛け工程において、前記ガラスファイバに前記第2樹脂が塗布される請求項6または請求項7に記載の光ファイバの製造方法。 - ガラス母材から線引きされたガラスファイバに第1樹脂を塗布し、前記第1樹脂を硬化させることによって第1被覆とする光ファイバの製造方法であって、
前記ガラスファイバを、第1期間において、第1速度で走行させる第1工程と、
前記ガラスファイバの速度を、前記第1期間に続く第2期間において、前記第1速度から第2速度に上昇させる第2工程と、
前記ガラスファイバの速度を、前記第2期間に続く第3期間において、前記第2速度に維持する第3工程と、
を有し、
前記第2工程において、前記第1樹脂の塗布を開始してから、前記第1速度より速く前記第2速度より遅い第3速度に達するまでの前記第1被覆の厚さをTB1、前記第3工程における前記第1被覆の厚さをTB2としたとき、TB2/TB1は、1.0より大きく11.0以下であり、
前記第2工程において、前記ガラスファイバの速度が前記第2速度の0.2倍以下である時に、前記第1樹脂の前記ガラスファイバへの塗布を開始する工程を有し、
前記ガラスファイバの速度が、前記第3速度に達してから前記第2速度に達するまでの、前記第1被覆の厚さの10秒間あたりの増加量は、最大で1.00μmである光ファイバの製造方法。
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JPH04187546A (ja) * | 1990-11-21 | 1992-07-06 | Furukawa Electric Co Ltd:The | 光ファイバの製造方法 |
JP2001066476A (ja) * | 1999-08-30 | 2001-03-16 | Sumitomo Electric Ind Ltd | 光ファイバ素線の製造方法 |
JP2003212606A (ja) * | 2002-01-24 | 2003-07-30 | Fujikura Ltd | 光ファイバの製造方法 |
JP2004231427A (ja) * | 2003-01-28 | 2004-08-19 | Sumitomo Electric Ind Ltd | 光ファイバの線引き方法 |
JP2005263545A (ja) * | 2004-03-17 | 2005-09-29 | Sumitomo Electric Ind Ltd | 光ファイバ製造方法 |
JP2009227522A (ja) * | 2008-03-24 | 2009-10-08 | Furukawa Electric Co Ltd:The | 光ファイバの製造方法 |
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JPH04187546A (ja) * | 1990-11-21 | 1992-07-06 | Furukawa Electric Co Ltd:The | 光ファイバの製造方法 |
JP2001066476A (ja) * | 1999-08-30 | 2001-03-16 | Sumitomo Electric Ind Ltd | 光ファイバ素線の製造方法 |
JP2003212606A (ja) * | 2002-01-24 | 2003-07-30 | Fujikura Ltd | 光ファイバの製造方法 |
JP2004231427A (ja) * | 2003-01-28 | 2004-08-19 | Sumitomo Electric Ind Ltd | 光ファイバの線引き方法 |
JP2005263545A (ja) * | 2004-03-17 | 2005-09-29 | Sumitomo Electric Ind Ltd | 光ファイバ製造方法 |
JP2009227522A (ja) * | 2008-03-24 | 2009-10-08 | Furukawa Electric Co Ltd:The | 光ファイバの製造方法 |
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