阅读说明：本技术 光纤的制造方法 (The manufacturing method of optical fiber ) 是由 石田格 于 2018-02-08 设计创作，主要内容包括：一种用于光纤的制造方法。该制造方法包括：用于拉制光纤母材以形成裸光纤的拉制步骤；用于冷却裸光纤的第一冷却步骤；用于利用包含树脂前体的未固化涂层来涂覆裸光纤的外周的涂覆步骤；用于固化该未固化涂层以形成半固化涂层的第一固化步骤；用于进一步固化该半固化涂层的第二固化步骤；以及在第一固化步骤与第二固化步骤之间并且用于使用至少一个非接触式方向变换器来冷却该半固化涂层的第二冷却步骤。(A kind of manufacturing method for optical fiber.The manufacturing method includes: the draw step for drawing optical fiber base material to form bare fibre；For cooling down the first cooling step of bare fibre；For coating the coating step of the periphery of bare fibre using the uncured coating comprising resin precursor；For solidifying the uncured coating to form the first curing schedule of semi-solid preparation coating；For further solidifying the second curing schedule of the semi-solid preparation coating；And the second cooling step between the first curing schedule and the second curing schedule and for cooling down the semi-solid preparation coating using at least one contactless direction transformation device.)

1. a kind of methods for optical fiber manufacture, comprising:

Draw step, drawing optical fiber prefabricated rods are to form bare fibre；

First cooling step, the cooling bare fibre；

Coating step, setting includes the uncured coating of resin precursor on the periphery of the bare fibre；

First curing schedule solidifies the uncured coating to form semi-solid preparation coating；

Second curing schedule further solidifies the semi-solid preparation coating；And

Second cooling step non-connects between first curing schedule and second curing schedule and through at least one Direction transformation device is touched to cool down the semi-solid preparation coating.

2. methods for optical fiber manufacture according to claim 1,

Wherein, in first curing schedule, solidify the uncured coating until the curing degree of the semi-solid preparation coating becomes It is 0.25 or bigger.

3. methods for optical fiber manufacture according to claim 1 or 2,

Wherein, it in second cooling step, is ejected on the semi-solid preparation coating by the non-contact direction transformation device Gas oxygen concentration be 10% or lower.

Technical field

The present invention relates to methods for optical fiber manufacture.

It is required that content is logical in the Japanese patent application submitted the 2017-077688th priority on April 10th, 2017 Reference is crossed to merge herein.

Background technique

It is known in the art that including the methods for optical fiber manufacture of draw step, coating step and curing schedule.It is drawing In step, drawing optical fiber prefabricated rods are to form bare fibre.In coating step, it is arranged on the periphery of bare fibre and is formed from a resin Uncured coating (hereinafter, simply referred to as uncured coating).In curing schedule, solidify uncured coating.

In such manufacturing method, in order to increase the production capacity of optical fiber, need to increase draw rate.However, if Draw rate increases, then optical fiber is shortened by the time of cooling device or coating solidification equipment, it is therefore desirable to increase these devices Number.

In addition, if the high temperature bare fibre drawn by leer Slow cooling from melting furnace, then can reduce as optical fiber One of key property transmission loss.Therefore, it in order to increase draw rate while limit the increase of transmission loss, needs to increase The number of leer.

Here, the bare fibre being easily damaged for being not provided with coating passes through leer.In addition, having the uncured coating of liquid Optical fiber by coating solidification equipment.If optical fiber under such conditions is contacted with for changing the pulley etc. in direction, can It can cause the reduction of the intensity of optical fiber and the deformation of coating.Therefore, each device needs the melting located immediately at preform Below furnace.

As described above, needing to increase the device being set up directly below melting furnace to increase the production capacity of optical fiber Number.However, in the limited existing workshop in space in the height direction, it is difficult to increase the number of device in this way, this Lead to the limitation to draw rate.

As for overcoming the technology of the limitation, patent document 1 discloses non-contact direction transformation device.Non-contact direction becomes Parallel operation can change the direction of travel of optical fiber without making its component and optical fiber contact.By using non-contact direction transformation device, i.e., Make also to can change the direction of travel of optical fiber before forming uncured coating or fully solidifying uncured coating.Therefore, often A device can be freely disposed, and can also increase drawing speed even if there is the local of space limitation in the height direction Degree.

Reference listing

Patent document

[patent document 1] Japanese Patent No. 5851636

Summary of the invention

Technical problem

Meanwhile usually using can coating with the ultraviolet curable resin of high speed curable, as optical fiber.Using ultraviolet light In the case that solidified resin is as coating, using ultraviolet radiator, UV-LED etc. as coating solidification equipment.Here, known solid When changing ultraviolet curable resin, temperature when resin solidification be the molecular weight of the resin after determining curing degree and solidifying because Element.For example, if temperature when solidifying is too high, solidifying may be insufficient, or the characteristic of such as Young's modulus may be due to The molecular weight of resin after solidification is small and deteriorates.In particular, as draw rate increases, because of cooling bare fibre or uncured Coating the time it takes shortens, so this problem is more likely to occur.In addition, in order to which steadily coating is wanted on bare fibre As the resin material of coating, the temperature of resin material can be increased with the viscosity for reducing resin material.Increase resinous wood The temperature of material is also likely to be to increase the factor of the temperature of uncured coating to adjust viscosity.Receive the heat by sendings such as ultraviolet radiator Amount is also likely to be to increase the factor of the temperature of uncured coating.

The present invention given this situation is made, and the object of the present invention is to provide in the drawing for increasing optical fiber Manufacture has the method for the optical fiber of the coating of desired state in the case where speed.

Solution to the problem

To solve the above-mentioned problems, methods for optical fiber manufacture according to an aspect of the present invention includes: draw step, is drawn Preform is to form bare fibre；First cooling step, cooling bare fibre；Coating step is set on the periphery of bare fibre Set the uncured coating comprising resin precursor；First curing schedule solidifies uncured coating to form semi-solid preparation coating；Second Curing schedule further solidifies semi-solid preparation coating；And second cooling step, in the first curing schedule and the second curing schedule Between and semi-solid preparation coating cooled down by least one non-contact direction transformation device.

Advantageous effect of the invention

Above-mentioned aspect according to the present invention can be manufactured in the case where increasing the draw rate of optical fiber with desired The optical fiber of the coating of state.

Detailed description of the invention

Fig. 1 is the schematic diagram for showing the configuration of fiber manufacturing installation according to first embodiment.

Fig. 2 is the schematic diagram for showing the configuration of the fiber manufacturing installation according to second embodiment.

Specific embodiment

(first embodiment)

Below with reference to the configuration of the fiber manufacturing installation of Fig. 1 description according to first embodiment.Make in the following description In each attached drawing, ratio is suitably changed so that each component can recognize.

As shown in Figure 1, fiber manufacturing installation 1A includes control unit 10, the first cooling unit 13, coating unit 30, first Solidified cell 40A, non-contact direction transformation device 20A to 20C, the second solidified cell 40B, outside diameter measuring unit 50, direction transformation Device 20D and coiler 90, and each unit is arranged in this order from top.

Control unit 10 includes the melting furnace etc. for fused optic fiber prefabricated rods.Control unit 10 forms bare fibre 3.

First cooling unit 13 includes leer 11 and cooler 12.Leer 11 is for gradually cooling down from control unit The device for the high temperature bare fibre 3 that 10 melting furnace is drawn.By can reduce light via 11 Slow cooling bare fibre 3 of leer Fine transmission loss.It can be using cooling cylinder etc., as cooler 12.Cooling cylinder introduces a gas into the cavity of water cooling cylinder, and Make optical fiber by cavity to cool down optical fiber.The gas for introducing cavity includes helium, nitrogen, carbon dioxide or its mixed gas.Example Such as, the rate of heat transfer of helium and nitrogen is different.Therefore, the case where the mixed gas of helium and nitrogen is introduced cavity Under, the temperature of the bare fibre 3 by cooling cylinder can be adjusted by changing the blending ratio of these gases.

Coating unit 30 by mold coating (die coating) etc. by the fluent material comprising resin precursor (below In, referred to as resin material) apply or is coated to the periphery of bare fibre 3 to form uncured coating.In the present embodiment, locate It is referred to as " uncured coating " in the coating of the state before through the first solidified cell 40A, and is in and is passing through first The coating of state after solidified cell 40A and before through the second solidified cell 40B is referred to as " semi-solid preparation coating ".This Outside, coating whether pass through solidified cell 40A, 40B it is not important in the case where, be referred to as " coating ".

The coating of resin material is, for example, the double-deck coating.In bilayer coating, the primary that will be used to have low Young's modulus The resin material of coating is applied to inside, and will be used to have the resin material of the secondary coating of high Young's modulus to be applied to outside Portion.It is solid that it is, for example, possible to use the ultraviolet lights of such as urethane acrylate resin (urethane acrylate resin) Change resin as coating.In addition, coating unit 30 may be configured to that primary coating and secondary coating is respectively coated, or simultaneously Coat primary coating and secondary coating.In the present embodiment, state on the periphery that coating is arranged on bare fibre 3 Element is referred to as optical fiber.

In order to realize stable coating, needed by the viscosity that coating unit 30 is applied to the resin material of bare fibre 3 one Determine lower in degree.Temperature by increasing resin material can reduce the viscosity of resin material.It therefore, be by coating unit 30 The temperature of the resin material of application can be increased to room temperature or more in advance, this may be to cause the temperature of uncured coating raised One of factor.Particularly, it since the viscosity of resin material at room temperature is higher, when being applied by coating unit 30, needs Increase the temperature of resin material.

In coating situation made of ultraviolet curable resin, can be used ultraviolet radiator, UV-LED and they Combined solidification equipment is as the first solidified cell 40A.The number for being set as the solidification equipment of the first solidified cell 40A can benefit It uses and is determined by the curing degree K of the coating of these solidification equipments as index.In addition, the curing degree K in present embodiment Using the gel fraction of description is defined later.

Multiple non-contact direction transformation device 20A, 20B, 20C are arranged in this order below the first solidified cell 40A.It is non-to connect Direction transformation device 20A, 20B, 20C are touched respectively by 90 °, 180 ° and 90 ° of the going direction changing of optical fiber.For example, non-contact direction Converter 20A is by the direction of travel of optical fiber from changing about 90 ° in downward direction to horizontal direction.The non-of installation can suitably be changed Contact the angle etc. that the number, installation site, direction of direction transformation device change.

Non-contact direction transformation device 20A to 20C has the guiding groove for guiding bare fibre 3 or optical fiber.In guiding groove, It is formed for for making the outlet of the fluid (gas) to float along the optical fiber that guiding groove is routed.Non-contact direction transformation device 20A To 20C by spraying on optical fiber the gas of such as air or helium (He) from outlet, in the feelings for not making component and optical fiber contact Optical fiber is set to float under condition.The configuration of non-contact direction transformation device in present embodiment with Japanese Patent No. 5851636 in retouch The configuration stated is identical, therefore omits detailed description herein.

In the case where using air as the gas being ejected on optical fiber, the gas flow needed for making optical fiber float is, for example, About 100L/min to 200L/min.Gas flow is suitably changed according to the width etc. of gas vent.It, can be with by regulating gas amount The amount of floating of optical fiber is adjusted, i.e. optical fiber passes through position relative to each component.

When optical fiber by position when being significantly changed, optical fiber and each component contact, this causes the strength reduction of optical fiber.This Outside, solidification equipment of the UV-LED as the first solidified cell 40A or the second solidified cell 40B can be used.Because UV-LED's Irradiation light has directionality, it is possible to which the region for irradiating ultraviolet light is relatively small.Therefore, in order to reliably to uncured coating Or semi-solid preparation coating irradiates ultraviolet light, need tighter to control optical fiber passes through position.Therefore, position sensor (not shown) It is arranged below non-contact direction transformation device 20A to 20C, and the position of position sensor measurement optical fiber.Based on measurement result, Adjusting will be ejected into the gas flow on optical fiber by non-contact direction transformation device 20A to 20C, so that the position of optical fiber is appropriate position It sets.

In the case where coating is to carry out the ultraviolet curable resin of cured free-radical curable by free radical polymerization, If the oxygen concentration for the gas being ejected on optical fiber is high, failure is cured due to oxygen inhibition.Therefore, it is necessary to will be connect by non- The oxygen concentration control that touching direction transformation device 20A to 20C is ejected into the gas on optical fiber is appropriate value.For example, making using air In the case where for gas, it can be contained by increasing or decreasing the gas in addition to oxygen of nitrogen included in such as air Amount carrys out the oxygen concentration of regulating gas.

However, coating can be by gas cooling when in gas injection to optical fiber.Non-contact direction in present embodiment Converter 20A to 20C is arranged between the first solidified cell 40A and the second solidified cell 40B, focuses on cooling capacity.Also It is to say, non-contact direction transformation device 20A to 20C is formed between the first solidified cell 40A and the second solidified cell 40B cooling half Second cooling unit 14 of solidify coating.

Next, description is used the methods for optical fiber manufacture of the fiber manufacturing installation 1A configured as described above.

Firstly, drawing optical fiber prefabricated rods are in control unit 10 to form bare fibre 3 (draw step).

Next, gradually cooling down bare fibre 3 in leer 11 to keep the transmission loss of optical fiber low.In addition, passing through Bare fibre 3 is cooled to predetermined temperature (the first cooling step) by cooler 12.

Next, in coating unit 30, on the periphery of bare fibre 3 uncured coating of the setting comprising resin precursor with It is formed optical fiber (coating step).At this point, the temperature of the resin material as the application of uncured coating is increased to room temperature or more in advance To reduce its viscosity.

Next, solidifying uncured coating in the first solidified cell 40A to become semi-solid preparation coating (the first solidification step Suddenly).In addition, heat issued by the semi-solid preparation coating of the optical fiber of the first solidified cell 40A via solidification equipment etc. is further Heating.

Next, passing through the non-contact side of the second cooling unit 14 between the first curing schedule and the second curing schedule To converter 20A to 20C, while changing the direction of travel of optical fiber cooling semi-solid preparation coating (the second cooling step).

Next, further solidifying semi-solid preparation coating (the second curing schedule) in the second solidified cell 40B.

Next, measuring the outer diameter of optical fiber in outer diameter measuring unit 50.

It then, is substantially horizontal direction by the going direction changing of optical fiber by direction transformation device 20D, and by winding 90 wound optical fibers of device.In addition, because being cured by the coating of the optical fiber of the second solidified cell 40B, it is possible to using all If the direction transformation device of contact-type pulley is as direction transformation device 20D.

(second embodiment)

Next, second embodiment according to the present invention will be described, but the base of basic configuration and first embodiment This configuration is identical.Therefore, it is similar configuration be endowed identical appended drawing reference, the description thereof will be omitted, and will only describe and its Difference.

Present embodiment and first embodiment are the difference is that the configuration of the second cooling unit 14 and the second solidification The arrangement of unit 40B.

As shown in Fig. 2, the second cooling unit 14 is arranged in fiber manufacturing in the fiber manufacturing installation 1B of present embodiment The lowest part of equipment 1B.Second cooling unit 14 is formed by a non-contact direction transformation device 20E.Non-contact direction transformation device 20E is by the direction of travel of optical fiber from changing about 90 ° in downward direction to horizontal direction.

According to the present embodiment, the second cooling unit 14, the second solidified cell 40B and outside diameter measuring unit 50 are arranged in light The lowest part of fine manufacturing equipment 1B.Therefore, compared with first embodiment, it can reduce the upper and lower of entire fiber manufacturing installation To size.

(example)

Hereinafter, the methods for optical fiber manufacture that will use specific example that present embodiment is more fully described.

As example 1, optical fiber is manufactured by fiber manufacturing installation 1A shown in FIG. 1.It is 125 μm in the outer diameter of bare fibre 3 And in the case that the outer diameter of optical fiber is 250 μm, the double-deck ultraviolet curable resin (urethane acrylate) is used work For coating.Draw rate is 50m/sec.Two ultraviolet radiators are installed as the first solidified cell 40A.Installation three is non-to be connect Direction transformation device 20A, 20B, 20C are touched, as the second cooling unit 14.Three non-contact direction transformation device 20A, 20B, 20C points Not by 90 °, 180 ° and 90 ° of the going direction changing of optical fiber.It is ejected on optical fiber by non-contact direction transformation device 20A to 20C Gas is the air that oxygen concentration is adjusted to 10%.Four ultraviolet radiators are installed as the second solidified cell 40B.

The coating of thus obtained optical fiber is cured, and the characteristic of coating is also good.By the first solidified cell 40A it The curing degree of semi-solid preparation coating afterwards is K=0.25.

Here, the definition that the gel fraction in the example and curing degree K will be described.Calculated for gel point by the following method Number.It firstly, the optical fiber as sample is input to Soxhlet extractor (Soxhlet extractor), and is 90 DEG C in temperature And the time is to use methyl ethyl ketone (MEK) to execute Soxhlet extraction as Extraction solvent under conditions of 240 minutes.Hereafter, by sample Product 60 DEG C at a temperature of it is 240 minutes dry.By the dry weight of the insoluble matter after extracting divided by the sample before extraction Weight carrys out calculated for gel score.In addition, temperature when extracting can be the temperature of the boiling point greater than or equal to MEK, and can be with It is the temperature and time of the extraction saturation of eluant, eluent.In addition, for dry temperature and time, dry weight can be saturation.

Gel fraction increases with the increase of the UV exposure to coating, and is saturated at certain UV exposure. UV exposure is by by the UV illumination (mW/cm of each UV irradiation unit²) value of acquisition multiplied by each irradiation time (second). In addition, the irradiation time in fiber manufacturing installation is defined as removing by the distance (m) for passing through the optical fiber in UV irradiation unit The value obtained with draw rate (m/sec).That is, can be by via the number for changing draw rate, UV irradiation unit Mesh or UV illumination prepare multiple samples and assess the gel fraction of each sample, obtain between UV exposure and gel fraction Relationship.

Here, the lower limit value for the UV exposure for being saturated gel fraction is set as W1, and by saturation gel at this time Score is set as G1.Next, the UV exposure (W2) for being utilized as the 1/10 of W1 prepares sample, and by thus obtained gel Score definition is G2.In addition, in the case where the gel fraction of sample to be assessed is G3, the curing degree K of sample to be assessed It is defined by following formula (1).

K=(G3-G2)/(G1-G2) ... (1)

As example 2, optical fiber is manufactured by fiber manufacturing installation 1B shown in Fig. 2.One ultraviolet radiator is installed to make For the first solidified cell 40A.Using a non-contact direction transformation device 20E (90 ° of transformations), as the second cooling unit 14.Peace Two ultraviolet radiators are filled as the second solidified cell 40B.Other configurations are identical as example 1.In this example, with 10m/ The draw rate drawing optical fiber of sec.The coating of thus obtained optical fiber is cured, and the characteristic of coating is also good.

As comparative example 1, using the configuration for the Fig. 1 for not including the second cooling unit 14 with the draw rate system of 50m/sec Make optical fiber.Although the coating for the optical fiber that thus mode obtains is cured, the Young's modulus of coating reduces compared with example 1 About 20%.This is because optical fiber is half in the state that semi-solid preparation coating is via heating is kept by the first solidified cell 40A The temperature of solidify coating be it is high in the state of enter the second solidified cell 40B and be cured.That is, because semi-solid preparation applies Layer is cured in the state that temperature is higher than the temperature in example 1, so point of the urethane acrylate as coating Son amount reduces, and Young's modulus reduces.

As comparative example 2, contact direction is changed by the non-contact direction transformation device 20E in the configuration by Fig. 2 and is become Parallel operation (pulley) manufactures optical fiber with the draw rate of 10m/sec.The cross sectional shape of the coating of thus obtained optical fiber deform and It is not perfectly round.This is because coating of the optical fiber before through the second solidified cell 40B solidifies insufficient state Lower contact pulley.

As comparative example 3, relative to the configuration of Fig. 1, the position of non-contact direction transformation device 20A to 20C is converted into painting Cover the position between unit 30 and the first solidified cell 40A.In the optical fiber obtained with this configuration, coating diameter is in longitudinal direction Upper fluctuation.This is because under the uncured state of coating, by by gas from non-contact direction transformation device 20A to 20C Be ejected on optical fiber, uncured coating due to gas pressure and deform.

As comparative example 4, in the configuration of example 1, it is ejected on optical fiber by non-contact direction transformation device 20A to 20C Gas be oxygen concentration be 20% air.Solidification of the thus obtained optical fiber with insufficient coating and have sticky table Face.This is because the urethane acrylate for being adopted as coating is the ultraviolet curable resin of free-radical curable, And the oxygen concentration for spraying gas is high, causes to solidify failure due to caused by oxygen inhibition.Because the oxygen of the gas in example 1 is dense Degree is 10%, and the oxygen concentration of the gas in comparative example 4 is 20%, so passing through non-contact direction in the second cooling step The oxygen concentration for the gas that converter 20A to 20C is ejected on the semi-solid preparation coating of optical fiber is preferably 10% or lower.

As comparative example 5, relative to the configuration of example 1, the number of the ultraviolet radiator as the first solidified cell 40A Become one.Draw rate is 50m/sec, this is identical as the draw rate of example 1.After the first solidified cell 40A The curing degree of semi-solid preparation coating is K=0.20.The cross sectional shape of the coating of thus obtained optical fiber is not perfectly round.This is Because compared with example 1, as reduce the number that install the ultraviolet radiator as the first solidified cell 40A as a result, The gas of non-contact direction transformation device 20A to 20C is ejected on optical fiber in the state that the solidification of coating is insufficient, and makes to apply Layer deformation.

It is 0.25 in example 1 by the curing degree K of the semi-solid preparation coating after the first solidified cell 40A and is comparing It is 0.20 in example 5.As a result, in the first curing schedule, it is expected that solidifying uncured coating until the curing degree K of semi-solid preparation coating becomes It is 0.25 or bigger.Draw rate is faster, and optical fiber is shorter by the time of a solidification equipment, and by uncured coating or half The amount for the ultraviolet light that solidify coating absorbs is smaller.Therefore, it can be adjusted according to draw rate and be set as the first solidified cell 40A's The number of solidification equipment, so that being 0.25 or bigger by the curing degree K of the semi-solid preparation coating after the first solidified cell 40A.

As comparative example 6, relative to the configuration of example 1, the position of non-contact direction transformation device 20A to 20C is converted into Position before coating unit 30.That is, the second cooling unit 14 is not disposed on the solidification of the first solidified cell 40A and second Between unit 40B.Draw rate is 50m/sec.Although the coating for the optical fiber that thus mode obtains is cured, with 1 phase of example Than the Young's modulus of coating is reduced by about 20%.This is because cooling in the state of bare fibre 3 is sufficient, but half is solid Change coating since optical fiber is heated by the first solidified cell 40A, and optical fiber enters the second solidified cell in this state 40B, therefore semi-solid preparation coating is cured in the state of its temperature height.Instead of by a solidified cell one-step solidification coating, In It, can be cured in the case that solidified cell is divided into multiple solidified cells and cooling unit is arranged between solidified cell The temperature for limiting coating simultaneously increases.

As described above, manufacturing method according to the present embodiment, is deposited between the first curing schedule and the second curing schedule In the second cooling step by the cooling semi-solid preparation coating of at least one non-contact direction transformation device.Therefore, even if semi-solid preparation applies The temperature of layer increases in the first curing schedule, which can also reduce in the second cooling step.Utilize this configuration, In In second curing schedule, semi-solid preparation coating can be prevented to be cured in the case where the temperature of the semi-solid preparation coating is high, and can So that the coating after solidifying reaches desired state.

In addition, passing through non-contact direction transformation device 20A to the cooling semi-solid preparation coating of 20C, 20E in the second cooling step. Non-contact direction transformation device 20A has the high cooling capacity in gas injection to optical fiber to 20C, 20E, and can be short Semi-solid preparation coating is reliably cooled down in time.It is thus possible to increase draw rate.In addition, for example, by via non-contact direction Converter 20A is to 20C, 20E, the cooling semi-solid preparation while direction of travel of optical fiber is changed into horizontal direction from up and down direction Coating can prevent the size of whole device from increasing in the height direction.Furthermore it is possible to limit semi-solid preparation coating and direction transformation The component contact of device and deformation.

In addition, in non-contact direction transformation device 20A into 20C, 20E, it is solid to half with low curing degree K in gas injection When changing on coating, the pressure of gas may cause semi-solid preparation coating shape.Therefore, in the first curing schedule, can solidify not Solidify coating becomes 0.25 or bigger until the curing degree K of semi-solid preparation coating.Therefore, it can limit due to non-contact direction transformation The deformation of coating caused by the pressure of the gas of device 20A to 20C, 20E.

In the case where coating is the ultraviolet curable resin of free-radical curable, if the gas being ejected on coating Oxygen concentration is high, then may be cured failure due to oxygen inhibition.Therefore, in the second cooling step, non-contact direction transformation The oxygen concentration for the gas being ejected on semi-solid preparation coating can be set as 10% or lower to 20C, 20E by device 20A.Therefore, i.e., Making coating is the ultraviolet curable resin of free-radical curable, and the solidification that can also limit the coating due to caused by oxygen inhibition is lost The generation lost.Furthermore, it is possible to more reliably solidify semi-solid preparation coating.

It should be noted that technical scope of the invention is not limited to above embodiment, and spirit of the invention is not being departed from In the case where various modifications may be made.

For example, although using cooling cylinder as cooler 12 in fiber manufacturing installation 1A, 1B of embodiment, it can Using the cooler 12 with other configurations.For example, it is also possible to using non-contact direction transformation device as cooler 12.

In addition, although fiber manufacturing installation 1A, 1B of embodiment equipped with leer 11, according to needed for optical fiber Transmission loss is horizontal, can be using the configuration for not being equipped with leer 11.

In addition, although fiber manufacturing installation 1A, 1B of embodiment are equipped with there are two solidified cell 40A, 40B, Three or more solidified cells can be set.In this case, non-contact direction transformation device, which can be set, is being located at Between the solidified cell in multiple places.

In addition, can be substituted as with well known composition element above-mentioned without departing from the spirit of the invention Composition element in embodiment, and above embodiment and modification can be appropriately combined.

Reference signs list

1A, 1B ... fiber manufacturing installation 3 ... bare fibre 10 ... control unit 13 ... the first cooling unit 20A to 20C, The second solidified cell of non-contact the first solidified cell of direction transformation device 30 ... coating unit 40A ... the 40B ... of 20E ... 50 ... outer diameter is surveyed Measure unit 90 ... coiler