JP2010112711A - Imitative evaluation method for adhesiveness of optical fiber to colored resin layer and method for manufacturing colored coated fiber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imitative evaluation method for easily and effectively evaluating adhesiveness of optical fiber used as colored coated fiber to a colored resin layer even without manufacturing the coated fiber, and a method for manufacturing colored coated fiber using the same. <P>SOLUTION: This method for manufacturing colored coated fiber includes an imitative evaluation process, a selection process, and a coating process. The evaluation process is equipped with a preparation step for preparing a base used for the colored resin layer and coated with a colored resin, a disposition step for disposing optical fiber on the colored resin, a curing step for curing the colored resin, a moving step for moving the optical fiber so as to separate it from the base, and a determination step for observing the state of the optical fiber after its moving to determine whether or not the adhesiveness is satisfactory of the optical fiber to the colored resin after its curing. In the selection process, the colored resin is selected based on an evaluation result in the evaluation process. In the coating process, the optical fiber is coated by using the colored resin selected in the selection process. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for simulating the adhesion between an optical fiber and a colored resin layer, and a method for manufacturing a colored optical fiber.

  An optical fiber is an optical fiber comprising a core and a clad covered with a protective resin layer. In optical fiber communication, an optical fiber ribbon containing a plurality of optical fiber strands may be used. In order to distinguish each optical fiber strand from this optical fiber tape core wire, using the colored optical fiber core wire which coat | covered each optical fiber strand with a different colored resin, this colored optical fiber core wire is arranged in parallel, There is a planar optical fiber ribbon in which each colored optical fiber is integrally coated with a resin.

  When handling this optical fiber ribbon, if the adhesion between the optical fiber of the colored optical fiber and the colored resin layer is insufficient, when removing the resin covering the colored optical fiber, The colored resin layer may be peeled off together with the resin, and the colored optical fiber cores may not be distinguished from each other in the optical fiber ribbon.

  In addition, when an optical fiber cable using a plurality of colored optical fiber cores is accidentally exposed to water, if the optical fiber strand and the colored resin layer are not sufficiently bonded, the colored optical fiber core There may be a case where the colored resin layer of the wire passes through and partly peels off at the boundary between the optical fiber and the colored resin layer, and water accumulates in the peeled part to cause partial blistering. . Such deformation of the coating layer applies a lateral pressure to the optical fiber to cause uneven microbending in the longitudinal direction, and the loss of transmitted signal light increases.

  Therefore, the optical fiber and the colored resin layer must be well bonded. For this reason, in order to grasp | ascertain whether this optical fiber strand and the colored resin layer are adhere | attached favorably, it is necessary to measure the adhesive strength of an optical fiber strand and a colored resin layer.

Patent Document 1 below describes a method for measuring the adhesive strength between such an optical fiber and a colored resin layer. In this measurement method, first, a colored optical fiber core is manufactured, and one end of the colored optical fiber core is bonded to a V groove of a test rubber body provided with a V groove with an adhesive. Then, a tensile test is performed by pulling the test rubber body and the other end of the colored optical fiber core wire in opposite directions with a constant force. In this tensile test, when the colored resin layer and the optical fiber strand are separated from each other, the tensile strength is defined as the adhesive strength between the optical fiber strand and the colored resin layer.
JP 2003-55005 A

  However, the measurement method described in the above-mentioned document measures the adhesive strength between the optical fiber and the colored resin layer after the colored optical fiber is once manufactured. Therefore, this measurement method is performed, and when the adhesion between the optical fiber and the colored resin layer is determined to be poor, the colored resin of the colored resin layer is selected again, and the colored optical fiber core is manufactured again. It is necessary to measure the adhesive strength between the optical fiber and the colored resin layer. For this reason, the measurement efficiency is poor, and it takes time to evaluate the colored resin layer. Therefore, it takes a long time to select a colored resin of a good colored resin layer, and there is a problem that the efficiency of manufacturing a colored optical fiber core is poor.

  Therefore, the present invention provides a simulation evaluation method that can easily and effectively evaluate the adhesion between an optical fiber and a colored resin layer used in a colored optical fiber without manufacturing a colored optical fiber, and It aims at providing the manufacturing method of the colored optical fiber core wire using this.

  The present invention provides the above-mentioned optical fiber strand used for a colored optical fiber core comprising: an optical fiber strand obtained by coating an optical fiber with a protective resin layer; and a colored resin layer covering the optical fiber strand; A method for simulating and evaluating adhesiveness with a colored resin layer, comprising preparing a base coated with a colored resin used for the colored resin layer, and disposing an optical fiber on the colored resin An observing step; a curing step for curing the colored resin; a moving step for moving the optical fiber strand away from the base; and a state of the optical fiber strand after movement, And a judgment step for judging whether or not the adhesiveness between the wire and the colored resin after curing is good. A simulation evaluation method for the adhesiveness between the optical fiber and the colored resin layer.

  According to such a simulation evaluation method, a base coated with a colored resin used for the colored resin layer is prepared, the optical fiber is placed on the colored resin, and the colored resin on the base is cured. Let the colored resin be a colored resin layer. For this reason, the state in which the colored resin layer is formed on the surface of the optical fiber can be reproduced without manufacturing the colored optical fiber. Further, the optical fiber strand is moved away from the base, and the state of the optical fiber strand after the movement is observed to determine whether the adhesive property between the optical fiber strand and the cured colored resin is good or bad. Thereby, it can be confirmed whether or not the optical fiber strand is separated from the cured colored resin, and a simulation evaluation can be performed as to whether or not the adhesion between the actual optical fiber strand and the colored resin layer is good. . In this way, the state in which the colored resin layer is formed on the surface of the optical fiber strand can be reproduced without producing the colored optical fiber core, and the adhesion between the optical fiber strand and the cured colored resin is good. Therefore, it is possible to easily and effectively evaluate the adhesion between the optical fiber and the colored resin layer.

  In this specification, the colored resin means a thermoplastic resin, an ultraviolet curable resin, a thermosetting resin, or a thermoplastic resin in which a pigment is mixed in the resin, an ultraviolet ray, where the resin has a color. A curable resin and a thermosetting resin are included.

  Further, in the determining step, when the optical fiber breaks and exposes the protective resin layer, or when the cured colored resin is peeled off from the base, the optical fiber and the cured colored resin It is preferable to judge that the adhesiveness of these is good. When the colored resin layer is satisfactorily bonded to the optical fiber strand, the optical fiber strand is not separated from the cured colored resin even if the optical fiber strand is pulled away from the base. For this reason, the protective resin layer of the optical fiber is broken, and the optical fiber inside the protective resin layer is exposed. Or the colored resin after hardening will peel from a base. In either case, it can be judged with the naked eye that the adhesiveness between the cured colored resin and the optical fiber is good. Therefore, the adhesion between the optical fiber and the colored resin layer can be more easily evaluated.

  In addition, the colored resin includes an ultraviolet curable resin, the base is made of a material that transmits ultraviolet light, and in the curing step, the base is irradiated with ultraviolet light from the side where the colored resin is not applied. This is preferable. If the colored resin contains an ultraviolet curable resin and the base is made of a material that transmits ultraviolet light, and the ultraviolet light is irradiated from the side on which the colored resin is not applied, the ultraviolet light is colored from the base side. The resin can be reached. For this reason, the colored resin existing between the optical fiber strand and the base can be more appropriately cured without hindering the irradiation of ultraviolet rays by the optical fiber strand.

  Further, the present invention is a method for producing a colored optical fiber having an optical fiber formed by coating an optical fiber with a protective resin layer, and a colored resin layer covering the optical fiber. A simulation evaluation process for performing a simulation evaluation of the adhesion between the optical fiber and the colored resin layer by a method for simulating the adhesion between the optical fiber and the colored resin layer, and an evaluation result of the simulation evaluation process A colored optical fiber core comprising: a selecting step for selecting the colored resin based on the coating method; and a coating step for coating the optical fiber using the colored resin selected in the selecting step. It is a manufacturing method.

  According to such a method of manufacturing a colored optical fiber core wire, the adhesion evaluation between the optical fiber strand and the colored resin layer is performed using the simulation evaluation method for the adhesive property between the optical fiber strand and the colored resin layer. A simulated evaluation is performed, and a colored resin to be used for the colored resin layer is selected on the basis of the evaluation result, and the colored fiber is used to coat and color the optical fiber strand. A colored resin that adheres well can be selected efficiently. Therefore, the colored optical fiber core wire in which the optical fiber strand and the colored resin layer are favorably bonded can be efficiently manufactured.

  ADVANTAGE OF THE INVENTION According to this invention, even if it does not manufacture a colored optical fiber core, the adhesiveness of the optical fiber strand used for a colored optical fiber core wire and a colored resin layer can be evaluated simply and effectively, and an optical fiber strand and a coloring can be evaluated. A colored optical fiber core wire that adheres to the resin layer with good strength can be efficiently manufactured.

  Hereinafter, embodiments of a method for simulating evaluation of adhesion between an optical fiber and a colored resin layer and a method for manufacturing a colored optical fiber according to the present invention will be described in detail with reference to the drawings.

(Colored optical fiber core)
First, the colored optical fiber core wire will be described with reference to FIG.

  FIG. 1 is a cross-sectional view of the colored optical fiber core wire 10. As shown in FIG. 1, the colored optical fiber core 10 includes an optical fiber strand 17 and a colored resin layer 15 that covers the optical fiber strand 17. Furthermore, the optical fiber 17 includes an optical fiber 11 and a protective resin layer 13 that covers the optical fiber 11.

The diameter of the optical fiber 11 is not particularly limited, but is 125 μm, for example. Although not shown, the optical fiber 11 has a core part and a cladding part, and the refractive index of the core part is higher than the refractive index of the cladding part. The material of the core part and the clad part is composed mainly of, for example, silica glass (SiO ₂ ), and a dopant for adjusting the refractive index is added to at least one of the core part and the clad part. For example, the core part is made of silica glass to which GeO ₂ is added, and the cladding part is made of pure silica glass or silica glass to which F is added.

  The protective resin layer 13 includes a first protective resin layer 13a on the optical fiber 11 side and a second protective resin layer 13b on the colored resin layer 15 side. The first protective resin layer 13a is a relatively soft resin layer, and the second protective resin layer 13b is a relatively hard resin layer. The thickness of the protective resin layer 13 is not particularly limited, but may be 55 to 70 μm. Examples of the resin for the first protective resin layer 13a and the second protective resin layer 13b include urethane (meth) acrylate-based, epoxy (meth) acrylate-based, and polyester (meth) acrylate-based ultraviolet curable resin compositions. Can be mentioned.

  The thickness of the colored resin layer 15 is not particularly limited, but is, for example, 2 to 20 μm. Further, as the resin of the colored resin layer 15, for example, urethane (meth) acrylate-based, epoxy (meth) acrylate-based, polyester (meth) acrylate-based ultraviolet curable resin compositions that are colored in a desired color. Is used.

(Manufacturing method of colored optical fiber core wire)
Next, a method for manufacturing a colored optical fiber according to the present invention will be described by taking as an example a method for manufacturing a colored optical fiber using an ultraviolet curable resin as a colored resin. The manufacturing method of the colored optical fiber core of the present invention manufactures the colored optical fiber core wire 10 by efficiently selecting the colored resin used as the colored resin layer.

  FIG. 2 is a flowchart showing a method for manufacturing the colored optical fiber core wire 10.

(Optical fiber manufacturing process)
FIG. 3 is a view showing a manufacturing apparatus for manufacturing the optical fiber 17 in order to carry out the manufacturing method of the colored optical fiber core 10.

  As shown in FIG. 3, the preform 1 made of glass is heated and melted in a heating furnace 51 such as an electric furnace and drawn downward. The drawn glass is drawn down to a predetermined outer diameter and then solidified by the cooling device 52 to become the optical fiber 11. Next, the optical fiber 11 passes through a coating device 54 containing an ultraviolet curable resin to be the first protective resin layer 13a, and is coated with this resin. Furthermore, the 1st protective resin layer 13a is formed by passing the ultraviolet irradiation device 55 and irradiating an ultraviolet-ray. Next, the optical fiber 11 covered with the first protective resin 13a passes through a coating device 57 containing an ultraviolet curable resin to be the second protective resin layer 13b, and is covered with this resin. Furthermore, the second protective resin layer 13b is formed by passing through the ultraviolet irradiation device 58 and being irradiated with ultraviolet rays. Thus, the optical fiber is manufactured. The manufactured optical fiber is wound around a winder 60 via a turn pulley 59.

(Simulation evaluation process)
Next, in order to select a colored resin to be used for the colored resin layer in which the manufactured optical fiber and the colored resin layer adhere well, a method for simulating the adhesion between the optical fiber and the colored resin layer is used. Then, a simulation evaluation of the adhesion between the optical fiber and the colored resin layer is performed.

  Hereinafter, the simulation evaluation method for the adhesiveness between the optical fiber and the colored resin layer will be described in detail with reference to FIGS.

  First, as shown in FIG. 4, a flat base 20 is prepared, and for example, the base 20 is arranged so that one surface of the base 20 is an upper surface. And the colored resin 22 used for a colored resin layer is apply | coated to the upper surface of the flat base 20 by fixed thickness. Thus, a base coated with the colored resin 22 is prepared (preparation step).

  As the colored resin 22, a resin that becomes the same resin as the colored resin layer 15 of the colored optical fiber core wire 10 shown in FIG. In the present embodiment, as the colored resin 22, one containing a pigment and an ultraviolet curable resin is used.

  The coating thickness of the colored resin 22 is not particularly limited, but is preferably 0.01 to 0.2 mm from the viewpoint of sufficiently curing the colored resin 22 with ultraviolet rays, and particularly about 0.1 mm. It is more preferable. The colored resin 22 is preferably applied by a spin coating method because the colored resin 22 can be applied with a constant thickness.

  The material for the base 20 is not particularly limited, but is preferably a material that transmits ultraviolet rays. If the base 20 is made of a material that transmits ultraviolet rays, when the colored resin 22 is cured, the base 20 is irradiated with ultraviolet rays from the lower surface side of the base, that is, the side on which the colored resin is not applied. In addition, ultraviolet rays can reach the colored resin. For this reason, the colored resin existing between the optical fiber strand and the base can be more appropriately cured without hindering the irradiation of ultraviolet rays by the optical fiber strand. Examples of the material of the base 20 include resin materials such as acrylic, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polycarbonate (PC).

  Next, as shown in FIG. 5, the optical fiber strand 17 shown in FIG. 1 is arranged on the colored resin 22 (arrangement step). At this time, one end 17 a of the optical fiber strand is disposed on the colored resin 22, and the other end 17 b of the optical fiber strand 17 is not in contact with the colored resin 22. Specifically, the other end 17b of the optical fiber 17 is disposed so as to come out from the upper side of the base 20. That is, the other end 17b of the optical fiber 17 is set as a free end.

  Next, the colored resin 22 is irradiated with ultraviolet rays to cure the colored resin 22 (curing step). Thereby, the colored resin 22 becomes the colored resin layer 24, and the colored resin layer 24 and the optical fiber 17 are bonded. The gel fraction of the colored resin layer 24 on the base 20 is the same as the gel fraction of the colored resin layer 15 used as the colored resin layer 15 of the colored optical fiber core wire 10 shown in FIG. To.

  As shown in FIG. 6, the bonding surface S between the optical fiber 17 and the colored resin layer 24 has an area of 1/6 or more of the outer peripheral surface of the optical fiber 17 on the colored resin layer 24. However, it is preferable because it is easy to observe the state of the optical fiber 17 and the workability of the simulation evaluation process is good in the determination step described later.

  Next, as shown in FIG. 7, the optical fiber 17 is moved so that the optical fiber 17 is pulled away from the base 20 in a state where the colored resin layer 24 and the optical fiber 17 are bonded. (Moving step). The movement of the optical fiber 17 is performed by pulling the other end 17b of the optical fiber 17 upward toward the base and moving in the direction of arrow A. In addition, when moving, it is preferable to move the optical fiber 17 so that the optical fiber 17 is separated from the base 20 at a speed of 1 cm / second or less. This is because if the optical fiber 17 is moved away from the base 20 at a speed of 1 cm / second or less, the optical fiber 17 tends to be difficult to break.

  Next, the state of the optical fiber 17 after movement is observed to determine whether or not the adhesive property between the optical fiber 17 and the colored resin layer 24 is good (determination step). Judgment is made as follows.

  As shown in FIG. 8, after moving the optical fiber 17, the protective resin layer 13 and the colored resin layer 24 are not separated, and the protective resin layer 13 of the optical fiber 17 is broken, and the protective resin layer 13. In some cases, the optical fiber 11 inside is exposed. In such a case, it is determined that the optical fiber 17 and the colored resin layer 24 are well bonded. Therefore, the colored resin layer 24 in this case may be suitable as the colored resin layer 15 used for the colored optical fiber core wire 10.

  Alternatively, as shown in FIG. 9, after the optical fiber strand 17 is moved, the protective resin layer 13 and the colored resin layer 24 are not separated, and the colored resin layer 24 is peeled off from the base 20 and the optical fiber strand is removed. 17 may adhere. Also in such a case, it is determined that the optical fiber 17 and the colored resin layer 24 are well bonded. Therefore, the colored resin layer 24 in this case may be suitable as the colored resin layer 15 used for the colored optical fiber core wire 10.

  On the other hand, as shown in FIG. 10, after the optical fiber 17 is moved, the protective resin layer 13 and the colored resin layer 24 of the optical fiber 17 may be separated from each other. In such a case, it can be determined that the optical fiber 17 and the colored resin layer 24 are not well bonded. Accordingly, the colored resin layer 24 in this case may not be suitable as the colored resin layer 15 of the colored optical fiber core wire 10.

  According to such a method for simulating the adhesion between an optical fiber and a colored resin layer, the colored resin 22 of the colored resin layer on the base 20 on which the optical fiber 17 is disposed is cured and colored. The resin 22 is changed to a colored resin layer 24. For this reason, the state in which the colored resin layer 15 is formed on the surface of the optical fiber 17 can be reproduced without manufacturing the colored optical fiber core wire 10. Further, it is confirmed whether the optical fiber 17 is separated from the colored resin layer 24 by moving the optical fiber 10 so as to be separated from the base 20 and observing the state of the optical fiber 17 after the movement. It can be determined whether or not the adhesion between the optical fiber 17 and the colored resin layer 24 is good. Therefore, even if the colored optical fiber core 10 is not manufactured, the adhesion between the optical fiber 17 used for the colored optical fiber core 10 and the colored resin layer 15 can be simulated and evaluated.

(Selection process)
Next, the colored resin of the colored resin layer 24 that is evaluated to be satisfactorily bonded to the optical fiber 17 and the colored resin layer 24 in the simulation evaluation process described above is selected.

(Coating process)
FIG. 11 is a diagram showing a manufacturing apparatus for manufacturing the colored optical fiber core 10 from the optical fiber strand 17 for implementing the manufacturing method of the colored optical fiber core 10.

  The optical fiber 17 passes from the feeder 71 through the coating device 73 containing the colored resin of the colored resin layer 15 and is coated with the colored resin. The coating device 73 is set with the colored resin selected in the above selection process. The optical fiber 17 is coated with a colored resin, then passes through an ultraviolet irradiation device 74, and irradiated with ultraviolet rays, whereby the colored resin layer 15 is formed. Thus, the colored resin layer 15 is coated on the optical fiber 17.

  In this way, the colored optical fiber core wire 10 is manufactured. Thereafter, the colored optical fiber core wire 10 is wound around the bobbin 76.

  The colored optical fiber core 10 manufactured in this way is evaluated by simulating the adhesion between the optical fiber strand 17 and the colored resin layer 15 before actually manufacturing the colored optical fiber core 10. Based on the evaluation result, the colored resin of the colored resin layer 15 is selected. Then, using this colored resin, the optical fiber 17 is coated and colored. Therefore, it is possible to efficiently select the colored resin of the colored resin layer 15 in which the optical fiber 17 and the colored resin layer 15 are favorably bonded. Therefore, the colored optical fiber core wire 10 in which the optical fiber strand 17 and the colored resin layer 15 are favorably bonded can be efficiently manufactured.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. For example, in the above embodiment, an ultraviolet curable resin is used as the colored resin, but the colored resin may be a thermosetting resin or a thermoplastic resin.

  Next, the content of the present invention will be described in more detail using examples, but the present invention is not limited to the following examples.

  In this example, the evaluation of the adhesion between the optical fiber used for the colored fiber core and the colored resin layer was evaluated by the above-described simulation evaluation method for the adhesion between the optical fiber and the colored resin layer. There is consistency between the result of manufacturing the colored optical fiber and evaluating the adhesion between the optical fiber and the colored resin layer, and the adhesion between the optical fiber of the present invention and the colored resin layer. This shows the effectiveness of the simulated sex evaluation method.

(Examples 1-6)
First, in the step of forming the protective resin layer in contact with the colored resin layer of the optical fiber, when the ultraviolet ray irradiation is performed on the ultraviolet curable resin serving as the protective resin layer, when the oxygen concentration in the ultraviolet irradiation device changes, It is known that the adhesiveness between the optical fiber and the colored resin layer changes. Therefore, when the oxygen concentration during ultraviolet irradiation changes, the evaluation result by the simulation evaluation method for the adhesion between the optical fiber and the colored resin layer of the present invention and the actual colored optical fiber are manufactured. It is shown whether there is consistency between the evaluation results of the adhesion between the optical fiber and the colored resin layer.

  Using an optical fiber having a diameter of 125 μm, this optical fiber was covered with a first protective resin layer, and the first protective resin layer was covered with resin E with a second protective resin layer. At this time, the outer diameter of the first protective resin layer was 190 μm, and the outer diameter of the second protective resin layer was 250 μm. When the first protective resin layer was covered with the ultraviolet curable resin E serving as the second protective resin layer and the ultraviolet irradiation was performed, the oxygen concentration in the ultraviolet irradiation apparatus was set to the values shown in Table 1.

Further, the colored resin A was applied to a thickness of 0.05 mm on an acrylic base by spin coating. Next, the optical fiber strand created on the apply | coated colored resin A was each arrange | positioned, and the colored resin A was hardened by irradiating an ultraviolet-ray.

  Next, each optical fiber was moved away from the base, and it was determined whether the adhesion between the optical fiber and the colored resin layer was good. As a result, for the optical fiber strand in which the protective resin layer is broken and the optical fiber is exposed, it is marked as ◯, and the optical fiber strand in which the protective resin layer and the colored resin layer cured from the colored resin A on the base are separated Is x. The results are shown in Table 1. As shown in Table 1, in Examples 1 and 2, the result that the adhesion between the optical fiber and the colored resin layer was poor was obtained, and in Examples 3 to 6, the optical fiber and the colored resin layer were obtained. As a result, good adhesion was obtained.

  Next, the colored optical fiber cores coated with the colored resin layer obtained by applying the colored resin A to the optical fiber strands of Examples 1 to 6 and irradiating ultraviolet rays with a thickness of 10 μm. It was created. Then, using OTDR (Optical Time Domain Reflectometer), the loss of signal light with a wavelength of 1.55 μm in the colored optical fiber core wire was measured. Then, these colored optical fiber core wires were immersed in 60 ° C. warm water for one month. After immersion, the loss of signal light having a wavelength of 1.55 μm was measured again using OTDR. And the value which the signal loss of the colored optical fiber core wire after immersion increased was calculated | required. The results are shown in Table 1. Further, the same colored optical fiber cores as those described above were prepared for Examples 1 to 6, and the loss of signal light having a wavelength of 1.55 μm in the prepared colored optical fiber cores was measured using OTDR. Then, it was immersed in normal temperature water (25 degreeC) for 1 month. After immersion, the loss of signal light having a wavelength of 1.55 μm was measured again using OTDR. And the value which the signal loss of the colored optical fiber core wire after immersion increased was calculated | required. The results are shown in Table 1. As shown in Table 1, for Examples 1 and 2, the loss of signal light increased after immersion in hot water at 60 ° C. and after immersion in room temperature water. As a result, there was almost no increase. Thereby, the colored optical fiber cores of Examples 1 and 2 have poor adhesion between the optical fiber and the colored resin layer, and blisters are formed between the optical fiber and the colored resin layer. Results were obtained. Moreover, the result that the adhesiveness of an optical fiber strand and a colored resin layer was favorable was obtained for the colored optical fiber cores of Examples 3 to 6.

  Next, the results of evaluation using the method for simulating the adhesion between the optical fiber and the colored resin layer according to the present invention, and the actual relationship between the colored resin layer and the optical fiber using the colored optical fiber core wire. The results of evaluating the adhesiveness were evaluated as “◯” because there was consistency in the examples in which the adhesiveness was good or the examples in which both were poor in adhesiveness. The results are shown in Table 1. As shown in Table 1, in Examples 1 to 6, the results of evaluation using the simulation evaluation method for the adhesion between the optical fiber and the colored resin layer of the present invention were used, and the colored optical fiber was actually used. The results of evaluating the adhesion between the colored resin layer and the optical fiber strand are consistent, and the simulation evaluation method for the adhesion between the optical fiber strand and the colored resin layer according to the present invention is effective. I understood.

(Examples 7 to 10)
Next, even when the type of the colored resin layer is changed, the evaluation result by the simulation evaluation method for the adhesion between the optical fiber strand and the colored resin layer of the present invention and the actual production of the colored optical fiber core It shows whether there is consistency between the evaluation results of the adhesion between the fiber strand and the colored resin layer.

The same optical fiber as in Example 5 was prepared. Next, in the same manner as in Example 5 except that the colored resin shown in Table 2 was used, the colored resin was applied on the acrylic base and the optical fiber strands formed on the colored resin were arranged. Thereafter, the colored resin was cured to form a colored resin layer.

  Next, each optical fiber was moved away from the base, and it was determined in the same manner as in Example 5 whether the adhesion between the optical fiber and the colored resin layer was good. The results are shown in Table 1. As shown in Table 1, Examples 7 to 9 have good adhesion between the optical fiber and the colored resin layer, and Example 10 has poor adhesion between the protective resin layer and the colored resin layer. The result was obtained.

  Next, a colored optical fiber was produced in the same manner as in Example 5 except that the colored resin shown in Table 2 was used. And the loss of the signal light in the produced colored optical fiber core wire was measured in the same manner as in Example 5. Thereafter, these colored optical fiber cores were immersed under the same conditions as in Example 5, and then the loss of signal light was measured in the same manner as in Example 5. And the value which the signal loss of the colored optical fiber core wire after immersion increased was calculated | required. The results are shown in Table 2. As shown in Table 2, for Examples 7 to 9, the loss of signal light hardly increased after immersion at 60 ° C. in warm water and after immersion at room temperature water. Increased results. Thereby, the result that the adhesiveness of an optical fiber strand and a colored resin layer was favorable was obtained for the colored optical fiber cores of Examples 7 to 9. In addition, the colored optical fiber core of Example 10 has poor adhesion between the optical fiber and the colored resin layer, and a result that a blister is formed between the optical fiber and the colored resin layer is obtained. It was.

  Next, the results of evaluation using the method for simulating the adhesion between the optical fiber and the colored resin layer according to the present invention, and the actual relationship between the colored resin layer and the optical fiber using the colored optical fiber core wire. Regarding the examples where the adhesion was evaluated as good as the results of the evaluation of the adhesiveness, or the examples where both the adhesiveness was poor, the results of the consistent examples were indicated as “◯”. The results are shown in Table 2. As shown in Table 2, in Examples 7 to 10, even when the type of the colored resin was changed, the results of evaluation using the simulation evaluation method for the adhesion between the optical fiber and the colored resin layer of the present invention and In fact, there is consistency with the result of evaluating the adhesion between the colored resin layer and the optical fiber strand using the colored optical fiber core, and the adhesion between the optical fiber strand of the present invention and the colored resin layer is The simulation evaluation method was found to be effective.

(Examples 11 to 15)
Next, even when the type of resin of the protective resin layer of the optical fiber strand is changed, the evaluation result by the method for evaluating the adhesion between the optical fiber strand and the colored resin layer of the present invention and the colored optical fiber core actually It shows whether there is consistency between the result of manufacturing the wire and evaluating the adhesion between the optical fiber and the colored resin layer.

An optical fiber was produced in the same manner as in Example 5 except that the protective resin layer was formed using the resin shown in Table 3. Furthermore, in the same manner as in Example 5, the colored resin used for the colored resin layer was applied on the base, and the optical fiber strands prepared on the colored resin were respectively disposed. Thereafter, the colored resin was irradiated with ultraviolet rays. Cured to obtain a colored resin layer.

  Next, each optical fiber was moved away from the base, and it was determined in the same manner as in Example 5 whether the adhesion between the optical fiber and the colored resin layer was good. The results are shown in Table 3. As shown in Table 3, Examples 11 to 14 have good adhesion between the optical fiber and the colored resin layer, and Examples 3 to 6 have adhesion between the optical fiber and the colored resin layer. The result was bad.

  Next, a colored optical fiber core was produced in the same manner as in Example 5 except that the same optical fiber as that used in Examples 11 to 15 was used. And the loss of the signal light in the produced colored optical fiber core wire was measured in the same manner as in Example 5. Thereafter, these colored optical fiber cores were immersed under the same conditions as in Example 5, and then the loss of signal light was measured in the same manner as in Example 5. And the value which the signal loss of the colored optical fiber core wire after immersion increased was calculated | required. The results are shown in Table 3. As shown in Table 3, for Examples 11-14, the loss of signal light hardly increased after immersion at 60 ° C. in warm water and after immersion at room temperature, and for Example 15, there was no signal loss. Increased results. Thereby, the result that the adhesiveness of an optical fiber strand and a colored resin layer was favorable was obtained for the colored optical fiber core wire of Examples 11-14. In addition, the colored optical fiber core of Example 15 had poor adhesion between the optical fiber and the colored resin layer, and a result that a blister was formed between the optical fiber and the colored resin layer was obtained. It was.

  Next, the results of evaluation using the method for simulating the adhesion between the optical fiber and the colored resin layer according to the present invention, and the actual relationship between the colored resin layer and the optical fiber using the colored optical fiber core wire. Regarding the examples where the adhesion was evaluated as good as the results of the evaluation of the adhesiveness, or the examples where both the adhesiveness was poor, the results of the consistent examples were indicated as “◯”. The results are shown in Table 3. As shown in Table 3, in Examples 11 to 14, even when the type of the protective resin layer was changed, the results of evaluation using the simulation evaluation method for adhesion between the optical fiber and the colored resin layer of the present invention were used. And the result of evaluating the adhesion between the colored resin layer and the optical fiber strand using the colored optical fiber core, and the adhesion between the optical fiber strand of the present invention and the colored resin layer is consistent. It was found that the evaluation method is effective.

It is sectional drawing of a colored optical fiber core wire. It is a flowchart which shows the manufacturing method of the colored optical fiber core wire of this invention. It is a figure which shows the manufacturing apparatus which manufactures the optical fiber strand for enforcing the manufacturing method of the colored optical fiber core wire of this invention. It is a figure which shows the preparation step of the simulation evaluation method of this invention. It is a figure which shows the arrangement | positioning step of the simulation evaluation method of this invention. It is sectional drawing in the hardening step of the simulation evaluation method of this invention. It is a figure which shows the movement step of the simulation evaluation method of this invention. It is a figure which shows the judgment step of the simulation evaluation method of this invention. It is a figure which shows the judgment step of the simulation evaluation method of this invention. It is a figure which shows the judgment step of the simulation evaluation method of this invention. It is a figure which shows the manufacturing apparatus which manufactures the colored optical fiber for enforcing the manufacturing method of the colored optical fiber core wire of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Colored optical fiber core wire 11 ... Optical fiber 13 ... Protective resin layer 15 ... Colored resin layer 17 ... Optical fiber strand 20 ... Base 22 ... Colored resin 24 ... Colored resin layer 51 ... Heating furnace 52 ... Cooling device 54 ... Coating device 55 ... UV irradiation device 57 ... Coating device 58 ... UV irradiation device 59 ... Turn pulley 60 ... Winding machine 71 ... Sending machine 73 ... Coating device 74 ... Ultraviolet irradiation device 76 ... Bobbin

Claims (4)

The optical fiber and the colored resin layer used in a colored optical fiber having an optical fiber formed by coating an optical fiber with a protective resin layer, and a colored resin layer covering the optical fiber. A method for simulating the adhesion of
A preparation step of preparing a base coated with a colored resin used in the colored resin layer;
An arrangement step of arranging an optical fiber on the colored resin;
A curing step for curing the colored resin;
Moving the optical fiber to move away from the base; and
Judgment step of observing the state of the optical fiber strand after movement, and judging whether the adhesive property between the optical fiber strand and the colored resin after curing is good,
A simulation evaluation method for adhesiveness between an optical fiber and a colored resin layer.   In the determining step, when the optical fiber breaks and exposes the protective resin layer, or when the cured colored resin peels from the base, the optical fiber and the cured colored resin The method for simulating the adhesion between an optical fiber and a colored resin layer according to claim 1, wherein the adhesion is judged as good.   The colored resin includes an ultraviolet curable resin, and the base is made of a material that transmits ultraviolet rays, and in the curing step, the base is irradiated with ultraviolet rays from the side where the colored resin is not applied. A method for simulating the adhesion between the optical fiber and the colored resin layer according to claim 1 or 2. A method of manufacturing a colored optical fiber having an optical fiber formed by coating an optical fiber with a protective resin layer, and a colored resin layer covering the optical fiber,
The simulation evaluation of the adhesion between the optical fiber and the colored resin layer is performed by the method for simulating the adhesion between the optical fiber and the colored resin layer according to any one of claims 1 to 3. Mock evaluation process;
A selection step of selecting the colored resin based on the evaluation result of the simulation evaluation step;
Using the colored resin selected in the selection step, a coating step for coating the optical fiber strand;
The manufacturing method of the colored optical fiber core wire characterized by including these.

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