JPH11295567A - Optical fiber cord and tape cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the single fiber separation of a tape cord, to prevent an optical fiber cord from being disassembled at the time of the single fiber separation, to easily remove the coating layer of the optical fiber cord and the coating layer of an optical fiber altogether and to prevent the optical fiber cord from coming apart at the time of manufacturing and handling the tape cord. SOLUTION: In this optical fiber cord 5 composed by integrating the optical fiber 1 and one or more high-tensile wires 2 vertically attached to it by the coating layer 4 and turning a cross section to a rectangular shape for which the coating layer 4 is provided with a part with the high-tensile wire 2 and the part without it and this tape code 7 composed by parallelly arranging the plural optical fiber cords 5 and integrating them by a taping layer 6, a coloring layer 10 is provided on the periphery of the optical fiber 1 and the tight adhesion force of the coloring layer 10 and the coating layer 4 of the optical fiber cord is made more than 18 gf. The Young's modulus of the taping layer 6 is made >=3 kgf/mm<2> and <=40 kgf/mm<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-diameter optical fiber cord suitable for high-density intra-station optical wiring and a tape cord obtained by tapering the optical fiber cord.

[0002]

2. Description of the Related Art The applicant of the present invention has proposed an optical fiber cord having a structure shown in FIG. 4 as an ultra-fine diameter and high strength optical fiber cord, and FIG.
A tape cord having the structure shown in FIG. The optical fiber cord 25 shown in FIG. 4 has a tensile strength in which two tensile strength wires 2 and 2 form a set on the optical fiber wire 1 formed by forming a strand coating layer 1b around the bare optical fiber 1a. A body 3 is vertically attached, and the strength member 3 and the optical fiber 1 are collectively covered and integrated with a covering layer 4 to form a schematic structure.
In the optical fiber cord 25, the cross-sectional shape of the coating layer 4 is rectangular, and the tensile strength member 3 is disposed only on one of the short sides of the coating layer 4 and the other short side of the coating layer 4. There is no strength member on the side and the long side.

The tape cord 27 shown in FIG. 5 is a tape-shaped one in which eight single-core optical fiber cords 25 shown in FIG. Each of the optical fiber cords 25 has a coating layer 4
Are arranged in a line, that is, the long sides of the coating layers 4 are adjacent to each other, and the short sides of the covering layers 3 are on the same side. . With this arrangement, the strength members 3, 3... Of the respective optical fiber cords 25, 25... Are located only on one side of the tape cord 27.

In the tape cord 27 having such a structure, the tensile strength member 3 does not exist between the optical fiber wires 1 of the adjacent optical fiber cords 25, and only the coating layer 4 exists. Can be reduced to achieve high density. Further, by adjusting the thickness of the coating layer 4, the width of the tape cord 27 can be made to match the width of the normal tape core wire, and the interval between the bare optical fibers 1a can also be adjusted by the optical fiber in the normal tape core wire. The spacing between the bare wires can be matched. For this reason, there is an advantage that the tape cord 27 can be fusion-spliced together with a normal tape core. However, in designing such a tape cord 27 and an optical fiber cord 25, there are the following problems to be solved.

[0005]

That is, for example, at the time of a jumper operation, it is necessary to separate the tape cord 27 into single optical fiber cords 25, 25. This single core separation can be easily performed. To be the first
The second problem is to prevent the optical fiber 1 and the strength member 3 of the optical fiber cord 25 from being disassembled at the time of single-core separation. The third task was to make it possible to identify each of 25. Also, for example, when performing fusion splicing, the bare optical fiber 1a must be exposed, so that the coating layer 4 of the optical fiber cord 25 and the element coating layer 1b of the optical fiber 1 can be easily and reliably connected. The fourth problem was to make it possible to remove them all at once. further,
When the tape cord 27 is handled in the manufacturing process of the tape cord 27 or in other operations, the tape layer 6 is broken and the tape cord 27 itself is disassembled.
The fifth problem was to prevent the integrated optical fiber cords 25, 25 ... from falling apart.

[0006]

SUMMARY OF THE INVENTION The present invention solves at least one of the above-mentioned problems.
An optical fiber cord characterized in that a coloring layer is provided on the circumference of the optical fiber and the adhesion between the coloring layer and the coating layer of the optical fiber cord is 18 gf or more. Claim 2
The invention described is a tape code, wherein the Young's modulus of the tape layer is 3 kgf / mm ² or more 40 kgf / mm ² or less. According to a third aspect of the present invention, there is provided a tape cord obtained by arranging a plurality of the optical fiber cords according to the first aspect in parallel and covering and integrating the optical fiber cord with a tape layer, wherein the Young's modulus of the tape layer is 3 kgf / mm ² or more. A tape cord characterized by being 40 kgf / mm ² or less.

By providing a colored layer on the circumference of the optical fiber, each optical fiber code in the tape code can be identified (third problem). By setting the adhesion between the colored layer and the coating layer as described above, the coating layer of the optical fiber cord and the wire coating layer of the optical fiber can be easily and reliably removed at once. (Fourth problem) In addition, when performing single-core separation of the tape cord, it is possible to prevent the optical fiber strand and the tensile strength member of the optical fiber cord from being decomposed (second problem). By setting the Young's modulus of the taped layer within the above range, single-core separation of the tape cord can be easily performed (first problem). Further, at the time of manufacturing the tape cord or handling the optical fiber cord, The integrated optical fiber cord can be prevented from being broken due to breakage of the taped layer (fifth problem).

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 shows an example of the optical fiber cord of the present invention. In FIG. 1, reference numeral 1 denotes an optical fiber. The optical fiber 1 is an ordinary one in which an element coating layer 1b (primary coating and secondary coating) is provided on the circumference of an optical fiber bare wire 1a having an outer diameter of 125 μm, and a coloring layer is further provided on the circumference. 1
0 is provided. In the present specification, the one in which the colored layer 10 is provided on the periphery of the optical fiber 1 is referred to as a colored core 11. The outer diameter of the colored core wire 11 is 250 to 260
μm. The colored core 11 has two tensile wires 2, 2
Are longitudinally attached to each other, and a colored core 11
The strength member 3 and the strength member 3 are covered and integrated by the covering layer 4 to form an optical fiber cord 5. In this optical fiber cord 5, the cross-sectional shape of the coating layer 4 is rectangular, and the tensile strength member 3 is disposed only on one of the short sides of the coating layer 4, and the other short side and the long knitting side are not. This is a portion where the tensile strength member 3 does not exist.

The coloring layer 10 is made of a coloring resin such as a UV-curable resin to which a pigment is added, and is thinly coated on the circumference of the optical fiber 1. As the tensile strength wire 2, a thin wire having a diameter of 20 to 120 μm made of aramid fiber, PBO fiber, glass fiber, steel wire, or the like is used. Also,
For the coating layer 4, a thermoplastic resin, a thermosetting resin, an ultraviolet curable resin, or the like is used. This optical fiber cord 5
Means that the dimension of the cross section is usually 0.35 to 0.4 in the long side direction.
It is 0 mm and 0.28 to 0.26 mm in the short side direction, but is not limited to this range.

In the present invention, the adhesion between the colored layer 10 and the coating layer 4 of the optical fiber cord 5 is preferably 18 gf or more as measured by a T-peel test method described later. If the adhesion between the coloring layer 10 and the coating layer 4 is smaller than this, the coating layer 4, the coloring layer 10, and the wire coating layer 1b cannot be removed at one time, and the bare optical fiber 1a is exposed. Work becomes difficult. Further, when the tape cord 7 is formed using the optical fiber cord 5, when the tape cord 7 is separated into the single-core optical fiber cord 5, the coating layer 4 and the coloring layer 10 are easily separated. This is not preferable because the colored core wire 11 and the tensile strength member 3 may be easily decomposed.

Here, the T-peel test method will be described with reference to FIG. First, a band-shaped coloring material sheet 32 is formed on one surface of a glass plate 31 using the same material as the coloring layer 10 under the same manufacturing conditions as when the coloring layer 10 is formed. Then, a coating material sheet 33 is formed on the coloring material sheet 32 using the same material as the coating layer 4 under the same manufacturing conditions as when the coating layer 4 was formed. The width of the coloring material sheet 32 and the covering material sheet 33 is 10 mm. Next, one end of the covering material sheet 33 is peeled off from the coloring material sheet 32, and this is sandwiched by the tension means 34. Subsequently, as shown in FIG. 2, the covering material sheet 33 is pulled in a direction in which the angle between the covering material sheet 33 and the coloring material sheet 32 becomes 90 ° C. Then, the tensile force at the time of pulling at a tensile speed of 50 mm / min is measured, and the obtained value is defined as the adhesion force. At the time of measurement, the coloring material sheet 32 (glass plate 31) is slid so that the angle between the covering material sheet 33 and the coloring material sheet 32 is always 90 ° C.

FIG. 3 shows an example of the tape code of the present invention. The tape cord 7 of this example is a tape-shaped one in which eight single-core optical fiber cords 5 shown in FIG. Each of the optical fiber cords 5 is arranged such that the portions of the coating layer 4 where the tensile strength members 3 are present are arranged in a line, that is, the long sides of the coating layer 4 are adjacent to each other, and the tensile strength of each of the optical fiber cords 5 is large. They are arranged such that the short side where the body 3 is arranged is the same side. With this arrangement, the strength members 3, 3... Of the optical fiber cords 5, 5,.

[0013] the tape layer 6, the coating layer 4 like is used and the resin for forming a formation as Young's modulus of the tape layer 6 becomes 3 kgf / mm ² or more 40 kgf / mm ² or less Is done. If the Young's modulus of the taped layer 6 is smaller than this, the taped layer 6 is damaged during the production of the tape cord 7 or in handling the tape cord 7 in other operations, and the optical fiber cords 5, 5,. It is not preferable because it may fall apart. If the Young's modulus of the taped layer 6 is too large, it becomes difficult to separate the optical fiber cords 5, 5,.

In the optical fiber cord 5 and the tape cord 7 having such a structure, since the colored optical fiber 11 is used as the optical fiber cord 5, each of the optical fiber cords 5, 5,. Can be identified. Therefore, it is convenient to separate and use the single-core optical fiber cords 5, 5,. Further, since the Young's modulus of the resin forming the taped layer 6 of the tape cord 7 is in the above range, single-fiber separation can be easily performed at the time of jumping work, and the like.
The taped layer 6 can be prevented from being damaged at the time of manufacture and handling of the tape cord 7, and the aggregate state of the optical fiber cords 5 can be reliably maintained. Further, since the adhesion between the colored layer 10 of the colored cord 11 and the covering layer 4 coated on the periphery thereof is within the above range, the covering layer 4 of the optical fiber cord 5, the colored layer 10, and the strand The coating layer 1b can be easily and reliably removed at once. Also, since the tensile members 3, 3... Are present only on one side of the tape cord 7, the tensile members 3, 3,. The coating layer 4, the coloring layer 10, and the wire coating layer 4 can be easily and collectively removed. Therefore, the work of exposing the bare optical fiber 1a can be performed efficiently and stably. In addition, since the adhesion between the colored layer 10 and the coating layer 4 is appropriate, the coating layer 4 of the optical fiber cord 5 and the colored layer 11 of the colored core 11 can be easily formed even when the tape cord 7 is separated into single fibers. High reliability without separation.

In the tape cord 7, the strength member 3 does not exist between the optical fiber wires 1 of the adjacent optical fiber cords 5, and only the coating layer 4 exists.
By adjusting the thickness of the optical fiber, the width of the tape cord 7 can be made to match the width of the normal optical fiber, and the interval between the bare optical fibers is also the interval between the optical bare wires in the ordinary tape. Can be matched. For this reason, the tape cord 7 can be fusion-spliced to a normal tape core. Further, since there is no tensile member in the width direction of the tape cord 7 as described above, the dimension of the width itself can be reduced, and the density can be increased. Further, when the tape cord 7 is branched into the optical fiber cord 5, the cord 5 itself is also used as the tensile members 3, 3
… And there is no need to reinforce with a reinforcing tube or the like, and it can be used as it is as a multi-core branch cord.

[0016]

EXAMPLES Hereinafter, the operation and effects of the present invention will be clarified by showing examples in which the optical fiber cord 5 and the tape cord 7 are specifically manufactured. (Example 1) A colored layer 10 was formed on the circumference of an optical fiber 1 having an outer diameter of 250 µm with an ultraviolet curable resin containing a pigment, thereby forming a colored core wire 11 having an outer diameter of 260 µm. On the other hand, a steel wire having an outer diameter of 100 μm was prepared as the tensile strength wire 2. An optical fiber cord 5 having the structure shown in FIG. 1 is produced by vertically attaching two tensile strength wires 2 and 2 to a colored core wire 11 and covering the periphery thereof with a coating layer 4 made of an ultraviolet curable resin. did.
The cross-sectional dimension of the optical fiber cord 5 is 0.3 in the long side direction.
8 mm, and 0.25 mm in the short side direction. Eight obtained optical fiber cords 5 were arranged in parallel, and these were integrated with a tape-forming layer 6 made of an ultraviolet curable resin, thereby producing a tape cord 7 having a structure shown in FIG. The Young's modulus of the taped layer 6 is 10 kgf / mm ^2, and the dimensions of the tape cord 7 are
The width was 2.2 mm and the thickness was 0.4 mm. Then, by changing the silicon content of the coloring agent, the adhesion between the coloring layer 10 and the coating layer 4 is changed as shown in Table 1 below,
Other than that, five kinds of optical fiber cords 5 and tape cords 7 were produced in the same manner as described above. The measurement of the adhesion is based on the T
The test was performed by the peel test method.

(Test Example 1) With respect to the tape cord 7 produced in the above-mentioned Example 1, the coating removal property when all eight bare optical fibers were exposed was examined. That is, using a hot stripper, the tape-forming layer 6 of the tape cord 7,
The coating layer 4, the coloring layer 10, and the wire coating layer 1b were collectively removed. The test was carried out on 10 optical fiber cords 5, and the one that was able to be removed at one time with a probability of 90% or more was marked as “○”, and the rate of failure at one time was 10%.
The case where it was larger was rated as x. The results are shown in Table 1 below. Further, it was examined whether or not the optical fiber cord 5 was decomposed when the tape cord 7 produced in Example 1 was separated into single fibers. In the test, single-core separation was performed on the ten tape cords 7 in the same manner as a normal jumping operation, and the colored core 11 of the optical fiber cord 5 and the tensile strength member 3 were separated.
The case where the rate of decomposition was less than 10% was evaluated as ○, and the case where the rate of decomposition was 10% or more was evaluated as ×. The results are shown in Table 1 below.
Shown in

[0018]

[Table 1]

(Example 2) An optical fiber cord 5 was produced in the same manner as in Example 1. However, the coating layer 4 and the colored layer 1
The adhesive force with 0 was set to 20 gf. Eight obtained optical fiber cords 5 were arranged in parallel, and these were integrated with a tape-forming layer 6 made of an ultraviolet curable resin, thereby producing a tape cord 7 having a structure shown in FIG. The dimensions of the tape cord 7 were 2.2 mm in width and 0.4 mm in thickness. Then, as shown in Table 2 below, six kinds of tape cords 7 were produced by changing the Young's modulus of the taped layer 6.

Test Example 2 In Example 2, when the tape cord 7 was produced, it was examined whether the tape cord 7 was disassembled and the optical fiber cords 5, 5,... The results are shown in Table 2 below. The test was performed on ten tape cords 7, and one having decomposed was present, and one not decomposing was regarded as no. Further, the tape cord 7 produced in Example 2 was subjected to single-core separation in the same manner as a normal jumper operation, and it was examined whether or not single-core separation was possible. The results are shown in Table 2 below. The test was carried out on ten tape cords 7, and a single core could be separated and a single core could not be separated.

[0021]

[Table 2]

[0022]

As described above, according to the present invention,
Each optical fiber cord can be identified when it is made into a tape, and the optical fiber cord that can prevent the optical fiber strand and the tensile strength member from being disassembled when the tape cord is separated into single fibers. Is obtained. Further, the coating layer of the optical fiber cord and the wire coating layer of the optical fiber can be easily and reliably removed at once. Further, an optical fiber cord having an extremely small diameter can be realized, and the mechanical strength is also high, so that the cord can be used as it is without covering with a reinforcing tube or the like. Further, according to the present invention, a single-core separation of a tape cord is easy, and a tape which can be prevented from being disassembled to separate the optical fiber cord when manufacturing the tape cord or handling the optical fiber cord. Code is obtained. Further, in the tape cord of the present invention, it is easy to remove the tensile strength wire, the taped layer and the coating layer all at once, and it is possible to make a fusion splicing with a normal tape core wire. The optical fiber cord obtained by branching this tape cord has high mechanical strength and can be used for wiring as it is.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of an optical fiber cord according to the present invention.

FIG. 2 is an explanatory diagram of a method for measuring the adhesion between a coating layer and a colored layer of an optical fiber cord.

FIG. 3 is a cross-sectional view showing one example of the tape cord of the present invention.

FIG. 4 is a cross-sectional view showing an example of the optical fiber cord proposed above.

FIG. 5 is a cross-sectional view showing an example of the previously proposed tape cord.

[Explanation of symbols]

1: optical fiber wire 2: tensile strength wire
3: strength member 4: coating layer 5: optical fiber cord
6 Tape layer 7 Tape code 10 Colored layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Ohashi 1440 Mutsuzaki, Sakura City, Chiba Prefecture Inside the Fujikura Sakura Plant (72) Inventor Kazutake Moto 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Telephone Co., Ltd. (72) Inventor Masao Tachikura Nippon Telegraph and Telephone Co., Ltd.

Claims (3)

[Claims] 1. An optical fiber and a vertically attached optical fiber.
An optical fiber cord comprising a plurality of tensile wires and at least one tensile wire integrated by a coating layer to form a rectangular cross section, and wherein the coating layer has a portion where a tensile wire exists and a portion where no tensile wire exists. An optical fiber cord, wherein a coloring layer is provided on the periphery of the optical fiber cord, and the adhesion between the coloring layer and the coating layer is 18 gf or more. 2. An optical fiber and a vertically attached optical fiber.
More than one tensile wire is integrated with a coating layer to form a rectangular cross section, and a plurality of optical fiber cords having a portion where a tensile wire exists and a portion where no tensile wire exists in the coating layer are arranged in parallel to form a tape layer. in coating, a tape cord formed integrally, the Young's modulus of the tape layer is 3 kgf / mm ² or more 40 kgf / mm ²
A tape code characterized by the following. 3. The tape cord according to claim 2, wherein the optical fiber cord according to claim 1 is used as the optical fiber cord.