JP2002174759A - Coated optical fiber tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an optical fiber facing the divided surface of a divided coated fiber type from easily detaching from a divided tape shaped layer in the case of dividing a coated optical fiber tape into two or more coated fiber tapes. SOLUTION: A first tape shaped layer 2 forming a vicinal area between adjacent optical fibers 1 of the coated optical fiber tape is composed of a resin whose Young's modulus is 0.05-5 kg/mm2 and whose T type peeling and sticking strength with the resin forming the coated layer of the optical fiber is 50-300 g/10 mm width, and a second tape shaped layer 3 forming other than it is composed of a resin whose Young's modulus is 10-200 kg/mm2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber ribbon (hereinafter sometimes abbreviated as "tape ribbon"). When the optical fiber is divided into the ribbons, the optical fiber is not easily detached from the ribbon after the division.

[0002]

2. Description of the Related Art An optical fiber ribbon is used, for example, when branching from a trunk cable to a branch cable at a terminal portion of an optical cable housing the optical fiber ribbon. Need to be split into core wires. FIG. 5 shows a conventional method of dividing such an optical fiber ribbon. This division is an example in which a four-core optical fiber ribbon is divided into two cores.

The four-core optical fiber ribbon 10 is formed by bundling four optical fiber wires 11, 11,...
3 in a lump. First, the blades 12, 1, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, and 3 on the central portion of the four-core ribbon 10 are provided on both sides.
2, the blade is moved in the longitudinal direction of the tape core 10, and the tape layer 13 of the tape 10 is cut. Next, a method is employed in which the tape core wire 10 is torn by hand and bisected.

However, when the tape core 10 is torn by hand during this division, the tear advances along the interface between the optical fiber 11 and the tape-forming layer 13 as shown in FIG. As shown in the figure, the dividing surface of the tape
Most of the optical fiber 11 is exposed. This phenomenon becomes more remarkable when an optical fiber having an identification coloring layer containing a release agent on the surface of the optical fiber is used as the optical fiber 11.

[0005] In the case of a two-core optical fiber cable as shown in FIG. 6 where most of the optical fiber element 11 is exposed, the exposed optical fiber element 11 is easily separated from the tape layer 13 during subsequent handling. However, there is a disadvantage that the tape cannot be used as a two-core tape after detaching or detaching.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for dividing an optical fiber ribbon into two or more optical fiber ribbons. In order to avoid easy disconnection from

[0007]

An object of the present invention is to provide a first tape forming layer which forms a region between adjacent optical fiber strands of an optical fiber ribbon and has a Young's modulus of 0.05 to 5 kg / m.
m ² , the second tape-forming layer made of a resin having a T-peel adhesive strength of 50 to 300 g / 10 mm width with the resin forming the coating layer of the optical fiber, and forming the other area, the Young's modulus The problem is solved by using a resin of 10 to 200 kg / mm ² . Then, the blade of the dividing blade is inserted into the center of the second tape-forming layer, a cut is made, and after tearing the tape, the optical fiber is separated from the divided surface of the divided tape. No division can be performed.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 shows an example of the optical fiber ribbon of the present invention, which is an example of a four-core optical fiber. In FIG. 1, reference numeral 1 denotes an optical fiber. This optical fiber 1
Has a normal outer diameter of 250 μm.
1, 1-2, 1-3, and 1-4 are bundled in close contact with each other in parallel in a row, and are collectively covered with a first taped layer 2 and a second taped layer 3 to form a four-core tape. It is a cord.

In this example, the optical fiber 2
The peripheral portion between the track 1-2 and the track 1-3 is constituted by the first taped layer 2, and the other portion is constituted by the second taped layer 3. The first taped layer 2 is not directly exposed on the surface of the tape core wire, and is always located inside the second taped layer 3. Also,
The first taped layer 2 is configured to fill a substantially V-shaped recess formed by the second line 1-2 and the third line 1-3.

The first taped layer 2 has a low Young's modulus of 0.05 to 5 kg / mm ² , and has a T-type peeling adhesion with a resin forming a coating layer of the optical fiber 1. It is made of a resin such as an ultraviolet curable resin or a modified silicone resin having a strength of 50 to 300 g / 10 mm width and good adhesion to the optical fiber 1. The second taped layer 3 has a Young's modulus of 10 to 200 kg / mm.
² , hard and rigid UV curable resin with high Young's modulus,
It is made of a resin such as a silicone resin.

Here, the Young's modulus of the first taped layer 2 is
If it is less than 0.05 kg / mm ² , the mechanical properties of the ribbon will be impaired. If it exceeds 5 kg / mm ² , the desired division will not be possible. The T-peel strength, which indicates the adhesion between the first taped layer 2 and the optical fiber, is 100.
When the width is less than g / 10 mm, the first taped layer 2 and the optical fiber 1 are easily separated at the time of division.
If the width exceeds mm, there is no problem in characteristics, but it is excessive.

Further, the Young's modulus of the second taped layer 3 is 1
If it is less than 0 kg / mm ² , the mechanical strength of the tape is insufficient, and if it exceeds 200 kg / mm ² , the elongation of the tape is
Flexibility is reduced. The properties required for these first and second taped layers 2 and 3 are as follows: by changing the Young's modulus of the resin forming the first and second taped layers 2 and 3, etc. It is based on the results of a tape twist test, a lateral pressure test, and a division test performed on these tape cores.

For the measurement of the T-type peel adhesive strength, a 1 mm-thick first sheet is formed from the resin forming the coating layer of the optical fiber 1 by a casting method, and the first tape-forming layer 2 is formed thereon. 1m thick by casting method
forming a second sheet of m. Next, this sheet was cut out into a strip having a width of 10 mm, and this was gripped with a tensile tester such as an autograph, and the first sheet and the second sheet were gripped and pulled at a speed of 300 mm per minute. It is performed by a method of obtaining the adhesive strength so that the appearance becomes T-shaped.

As shown in FIG. 2, a method of dividing an optical fiber ribbon having such a structure is as follows: a first tape between a second line 1-2 and a third line 1-3 from both sides of the tape core; The blade 4 of the cutting blade is inserted until it reaches the chemical layer 2, the blade is moved in the longitudinal direction along the tape core, a cut is made, and the cut is torn by hand. At this time, since the cut is in the soft first taped layer 2 having a low Young's modulus, when the cut is torn, the cut advances substantially along the center of the first taped layer 2 as shown in FIG. It is bisected neatly.

The adhesive strength between the optical fiber strand 1-2 and the first tape layer 2 is high, and the first tape layer 2 exists on the side of the second line 1-2 of the optical fiber strand. Since only a small part of the second wire 1-2 of the optical fiber is exposed, the second wire of the optical fiber is not easily separated from the split two-core tape. Similarly, with respect to the other split two-core tape, the third wire 1-3 of the optical fiber does not come off.

For manufacturing an optical fiber ribbon having such a structure, for example, the second wire 1-2 and the third wire 1-3 of the optical fiber 1 are arranged in parallel and sent to a coating die to form a first tape. After applying and curing the resin liquid to be the layer 2, the resin liquid to be the second taped layer 3 is sent to another coating die with the first line 1-1 and the fourth line 1-4 attached in parallel to this. Is applied and cured.

FIG. 4 shows another example of the optical fiber core of the present invention. This example has four cores as in the previous example, but the first and second wires 1-1 and 1 of the optical fiber are used.
2 and between the third line 1-3 and the fourth line 1-4, and the second line 1-2 and the third line 1-3 are in contact with each other.

In this example, the area in which the first taped layer 2 exists is wider than in the previous example, and the second line 1-2 and the third line 1-1 are provided.
3 and the whole. In the case of this example as well, the same division can be performed by inserting the blade of the dividing blade between the second line 1-2 and the third line 1-3.
Alternatively, the third wire 1-3 does not fall off from the divided two core wires.

As described above, according to the optical fiber ribbon of the present invention, the optical fiber 1
By forming the first taped layer 2 in the region between the two, the division is easily performed, and the optical fiber 1 does not separate from the divided tape core. Further, the optical fiber ribbon of the present invention is not limited to four cores,
The present invention can also be applied to cores, eight cores, ten cores, and other tape cores.

[0020]

As described above, in the optical fiber ribbon according to the present invention, a low Young's modulus and an optical fiber in the vicinity of the optical fiber forming the tape. A first taped layer having high adhesiveness is provided, and a second taped layer having a high Young's modulus is provided in other areas.

For this reason, when the tape core is divided between the optical fiber strands, the separation proceeds in the soft first taped layer. Since the exposed portion is reduced by being surrounded by the chemical layer, the optical fiber is not easily separated or dropped from the divided tape core, and the state of the multi-core core can be maintained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of an optical fiber ribbon according to the present invention.

FIG. 2 is an explanatory view showing a method for dividing an optical fiber ribbon according to the present invention.

FIG. 3 is a schematic sectional view showing a tape core obtained by dividing the optical fiber tape core of the present invention.

FIG. 4 is a schematic sectional view showing another example of the optical fiber ribbon of the present invention.

FIG. 5 is an explanatory view showing a conventional method for dividing an optical fiber ribbon.

FIG. 6 is a schematic sectional view showing a tape core obtained by dividing a conventional optical fiber tape core.

[Explanation of symbols]

Reference numeral 1 denotes an optical fiber, 2 denotes a first taped layer, and 3 denotes a second taped layer.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Suehiro Miyamoto 1440, Musaki, Sakura-shi, Chiba F-term in Fujikura Sakura Works (reference) 2H001 BB15 BB19 DD23 KK17 KK22 PP01

Claims (2)

[Claims] 1. An optical fiber ribbon comprising a plurality of optical fiber strands arranged in parallel and collectively covered with a tape layer, wherein a first tape layer forming a region between adjacent optical fiber strands is provided. A Young's modulus of 0.05 to 5 kg / mm ² , and a T-type peel adhesive strength with a resin forming a coating layer of an optical fiber strand of 5
The second taped layer, which is made of a resin having a width of 0 to 300 g / 10 mm and has an area other than this, has a Young's modulus of 10
An optical fiber ribbon comprising a resin of about 200 kg / mm ² . 2. The optical fiber ribbon according to claim 1, wherein when the optical fiber ribbon is divided, a cut reaching the first tape-forming layer is made, and the cut is split. How to split.