JPH04166808A - Thin type optical ribbon structure coated fiber - Google Patents

Abstract

PURPOSE:To divide a ribbon structure coated fiber into two parts from a central part in its width direction or to easily divide an element fiber of predetermined number of coated fibers from an arbitrary position through applying a twist to the ribbon structure coated fiber by setting adhesive strength between coating of the optical coated fiber and a plurality of optical fiber surfaces to a specific value. CONSTITUTION:A ribbon structures coated fiber 10 is formed into constitution such that an optical fiber 11 is parallelly arranged in a plurality of streaks to form a plurality of these element fibers 11 collectively coated with resign coating 12 into a ribbon shape. The element fiber is coated with the resin coating 12 in a manner wherein a ribbon thickness 10A of the ribbon structures coated fiber 10 obtains an external diameter 11A of the element fiber 11 at least plus 20mum or less. Close contact strength between the resin coating 12 and a plurality of the element fibers 11 is set so as to be in a range of 5 to 100g by 90 deg. T-Peel strength. In this way, the coated fiber 10 can be divided into two parts from a central part in the width direction or the element wire of predetermined number of coated fibers can be easily divided from an arbitrary position, by applying a twist to the coated fibers 10.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to an optical fiber ribbon coated with a coating material and formed into a tape shape. The present invention relates to a thin optical fiber ribbon whose thickness is reduced to the same extent as the outer diameter of the optical fiber and which can be easily divided by twisting the optical fiber ribbon.

"Prior art" Figure 7 shows a conventional split optical fiber ribbon (hereinafter referred to as
FIG.

This ribbon fiber 1 consists of four optical fiber strands (hereinafter abbreviated as strands) 2 arranged in parallel, two 4-fiber units in which these are covered with a secondary coating 3, and then these two This is an 8-fiber optical fiber ribbon formed into a tape by covering the units of the same unit at once with a secondary coating 4 made of an ultraviolet curable resin or the like.

Since the 8-core optical fiber ribbon I has the above configuration, it can be divided at the joint portion 5 of the unit. Also, by dividing at this joint part 5, 2
Four four-core optical fiber ribbons are obtained.

Incidentally, in recent years, in optical cables using optical fibers, ultra-high-density, multi-core optical cables that accommodate thousands of optical fibers have been inspected so that extremely large numbers of information can be transmitted. In order to store an extremely large number of optical fibers in a cable at high density in this way, a large number of thin tape cores with a thickness approximately equal to the outer diameter of the strands are laminated, and multiple laminates are assembled. Research is being conducted on methods for constructing cables by covering this material.

"Problems to be Solved by the Invention" However, the conventional split tape core mentioned above
It has a two-layer structure in which tape core units in which the strands are primarily coated with a coating material are arranged in parallel, and these are further coated with a coating material for a second time, making it a tape fiber with a normal single-layer coating (not a split type). Compared to the previous version, the tape thickness increased, making it impossible to make it thinner. For example, when a ribbon core having the same structure as the conventional split-type ribbon core described in h. That was the limit.

This invention was made in view of the above circumstances, and by making the tape core wire thin and twisting the tape core wire in the bracket, it can be divided into two from the center in the width direction, or it can be divided into two at any arbitrary position. An object of the present invention is to provide a thin optical fiber ribbon which can be easily divided into a predetermined number of strands.

"Means for Solving the Problems" This problem is solved by an optical fiber ribbon in which a plurality of optical fibers are arranged in parallel and the plurality of optical fibers are collectively coated with a synthetic resin to form a tape. The tape thickness of the tape core wire is the outer diameter of the optical fiber plus 20
μ debris or less, and the adhesion strength between the coating of the optical fiber core wire and the surfaces of the plurality of optical fibers is 90°T-P.
This can be solved by setting the ee1 strength to 5 to 100 g.

"Function" In the thin optical fiber ribbon of the present invention, the coupling between the coating of the optical fiber and the surfaces of the plurality of optical fibers is set in the range of 5 to 100 g at 90°T-Pee1 strength. Therefore, by twisting this optical fiber ribbon at a twisting pitch of about several tens of millimeters, it is possible to divide the optical fiber ribbon into two from the center in the width direction, or to twist the optical fiber ribbon at a twisting pitch of several tens of millimeters. It becomes possible to easily divide a wire with a number of cores of .

In addition, the optical fiber ribbon of the present invention has a bond between the coating of the optical fiber and the surfaces of the plurality of optical fibers in the range of 5 to 100 g at 90°1''-Pee1 strength as shown in "-". Since it is set, it can be easily divided by twisting, and this makes it possible to create a split-type optical fiber tape core with a single layer of coating, so that the thickness of the tape core becomes less than the outer diameter of the optical fiber plus 20 μm. can be configured.

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are diagrams showing an embodiment of the thin optical fiber ribbon of the present invention, and reference numeral 10 in the figures indicates an optical fiber ribbon (hereinafter abbreviated as tape ribbon).

”-The tape core wire 10 is optical fiber strand II (hereinafter referred to as
A plurality of strands (abbreviated as strands) are arranged in parallel, and these strands I
It has a structure in which I is collectively coated with a resin coating I2 and formed into a tape shape.

The resin coating 12 has a tape thickness of 1
0A is at least the outer diameter IIA of the wire II plus 20
It is coated so that it is less than μπ.

Further, the adhesion strength between this resin coating 12 and the plurality of wires II described in "1" is 5 to 1 at 90°T-Pee1 strength.
It is set to be in the range of 009.

If the adhesion strength between the resin coating 12 and the plurality of wires 11 is less than 5 g at 90°T-Pee1 strength, the bond between the resin coating 12 and the plurality of wires 11 is too weak. However, there is an inconvenience that it easily splits due to a certain degree of twisting force (twisting pitch of about 200 mm) that may be applied during normal handling. In addition, the adhesion strength above is 90°T.
-Pee1 strength is greater than 100g, resin coating 1
2. Because the bond between the plurality of strands Il described in 1.
Do not apply a strong twisting force that would cause the wire to become smaller than 0mm. .

1. The strand 1j is a bare optical fiber (hereinafter abbreviated as bare wire) 13 whose surface is coated with a coating 14. As the bare wire 13, an optical communication fiber such as a quartz-based bare mode fiber or a multimode fiber can be used.

In addition, the resin material of the coating 14 includes urethane acrylate),
Ultraviolet curing resins such as Evogisoacrylate, Evogisoacrylate, and Phtadiene acrylate are preferably used, and urethane acrylate ultraviolet curing resin is particularly desirable. The coating 14 may be a single soft resin layer, or a two-layer resin layer in which a hard resin is formed on a soft resin layer.

The adhesion strength between the surface of the wire 11 and the resin coating 12 is 9
In order to obtain the 0°T-Pee1 strength in the range of 5 to 100 g, for example, a release material such as silicone oil or fluororesin powder may be added to the coating 14 of the wire 11, or
Alternatively, it is preferable to apply a mold release agent to the outside of the coating 14 made of UV-cured resin or the like constituting the wire 11. Furthermore, it is also possible to adjust the adhesion strength by combining the above two methods.

In order to separate or divide two consecutive tape core wires 10, for example, as shown in FIG. By applying a twist such that
As shown in the figure, it is divided into three or more parts.

In the tape core wire 10 of this embodiment, the adhesion strength between the resin coating 12 and the plurality of wires 11 is set to 90°T −P.
Since the ee1 strength was set to be in the range of 5-100@, by twisting the tape core wire 10 at a twisting pitch of several tens of mm, the tape core wire 10 is twisted from the center in the width direction. It is possible to easily divide the wire into two parts, or easily divide a wire having a predetermined number of cores from an arbitrary position.

Further, the tape core wire 10 has an adhesion strength of 90% between the resin coating 12 of the optical fiber core wire and the plurality of strands II as described above.
°T-P ee1 strength is set in the range of 5-101, so it can be easily divided by twisting, so that the thickness of the tape core wire 10 is the outer diameter of the strand 11 plus 2
The split type tape core wire 10 can be constructed with a single layer of coating having a resistance of 0 μR or less. Therefore, it is possible to obtain a thin tape core wire 10 that is applicable to high-density multi-core optical cables and can be divided.

"Example" Each tape core wire of Examples 1 to 3 and Comparative Example 1.degree.

(Example 1) Bare quartz-based optical fiber a with a diameter of 125 μm
Element wire 1 with an outer diameter of 250 μM coated with a resin coating 14 made of urethane acrylate ultraviolet curable resin.
1 were arranged in parallel to form a fiber bundle, and a release agent (Nearlyse (trade name), manufactured by Dow Corning) was added to the surface of the fiber bundle. Subsequently, the surface of this fiber bundle is coated with a coating 12 made of a urethane acrylate ultraviolet curable resin to form a tape, thereby increasing the adhesion strength of 90°T between the resin coating I2 and the surface of the fiber bundle. - A tape core wire having a Pee1 strength of 40 g was prepared.

(Example 2) Silicone oil was used as a mold release agent, and the degree of adhesion between the resin coating 12 and the surface of the eight wires 11 was adjusted to 90°T-P.
The weight was set to 7 g at ee1 strength.

Other than that, a tape core wire was produced in the same manner as in Example I.

(Example 3) A UV curable resin containing 5 parts of silicone oil was used as the outermost coating I4 of the strands, and the surface of the 8 strands was laid out.
Second, the resin coating 12 is coated to form a tape, and the adhesion strength between the coating 12 and the surface of the eight wires 11 is set to 90°T-P.
The weight was set to 80 g at ee1 strength. Other than that, a tape core wire was produced in the same manner as in Example 1.

(Comparative Example 1) Guifree (trade name, manufactured by Daigin Co., Ltd.) was added as a mold release agent, and the adhesion strength between the resin coating 12 and the surface of the eight wires 11 was 3 g at 90°T-Pee1 strength. I set it so that Other than that, a tape core wire was produced in the same manner as in Example I.

(Comparative Example 2) Without using a mold release material, the adhesion strength between the resin coating 12 and the surface of the eight wires 11 was 120 g at 90° T-P ee1 strength.
It was set so that Other than that, a tape core wire was produced in the same manner as in Example 1.

Next, using each of the tape core wires of Examples 1 to 3 and Comparative Examples 1.2, the twisting force that might be applied during normal handling was measured using the twisting device shown in FIG. 6 at a pitch of 200 mm. Added twist. In addition, twisting with a pitch of 30 mm and twisting with a pitch of 50 mm were applied as twisting forces that did not cause fiber breakage, which were applied when the tape core wire was split and shifted.

As shown in FIG.
and a weight 19.

The - end of the tape core wire 10 is fixed to the holding base 16 of the twisting device 15, and the other end is used to take the weight 19 via the pulley 18 (t
I'J. Then, while rotating Hanotl I7 little by little, gradually tighten the tape core wire IO until the desired twisting pinch is achieved.
Added a twist to.

The weight of the weight 19 indicated by the symbol W in FIG. 6 is 500.
g, and the tape length I) of the test tape core wire is 50 cm.
And so.

-1, The results of the experiment are shown in Table 1 below.

Table 1 "Effects of the Invention" As explained above, in the thin optical fiber ribbon of the present invention, the adhesion strength between the coating of the optical fiber and the surfaces of the plurality of optical fibers is 90°T. -Peel strength,
5-1009, we decided to twist the optical fiber tape at a pitch of several tens of millimeters, divide the tape into two from the center in the width direction, or do whatever we wanted. It becomes possible to easily divide strands of a predetermined number of cores from the position.

In addition, the optical fiber ribbon of the present invention (J, as described above, the coupling between the coating of the optical fiber tape and the surfaces of the plurality of optical fibers was set to a range of 5 to 100 g at 90° T-Peel strength. Therefore, it can be easily divided by twisting it, thereby creating a split-type optical fiber tape core with a single layer of coating such that the thickness of the tape core is less than the outer diameter of the optical fiber plus 20 μM. Therefore, it is possible to obtain a thin, splittable optical fiber tape that is applicable to high-density multi-core optical cables.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the thin optical fiber ribbon of the present invention, and FIG. 2 is an enlarged view of a main part showing a portion (P) of the optical fiber ribbon shown in FIG. 1. Figure 3 shows
FIGS. 4 and 5 are diagrams for explaining the splitting method of the optical fiber tape shown in FIG. FIG. 6 is a diagram showing a twisting device for performing a twisting test on an optical fiber ribbon, and FIG. 7 is a sectional view showing a conventional optical fiber ribbon. 10・Thin optical fiber tape core, 10Δ Tape thickness 11・Optical fiber strand 11Δ・Strand outer diameter 14...Resin coating

Claims (1)

[Claims] In an optical fiber ribbon, in which a plurality of optical fibers are arranged in parallel and the plurality of optical fibers are collectively coated with a synthetic resin to form a tape, the tape thickness of the optical fiber ribbon is determined by the outside of the optical fiber. Diameter plus 20μm or less,
and the adhesion strength between the coating of the optical fiber core wire and the surfaces of the plurality of optical fibers is 5 g at 90° T-Peel strength.
A thin optical fiber tape core having a weight of ~100g.