JPH06313827A - Optical fiber tape fiber - Google Patents

Abstract

PURPOSE:To provide an optical fiber tape fiber with sufficient mechanical strength even if being of a thin type while enabling the individual separation of optical fibers. CONSTITUTION:Eight optical fibers 2... having secondary coating layers 6 (outermost coating layers) are arranged parallelly and integrated by a batch coating layer 3 to form an optical fiber tape fiber. In this optical fiber tape fiber 11, adhesive force between the secondary coating layer of the optical fiber 2 and the batch coating layer 3 is 90 deg., T-peel strength is 10g/cm or more, and the rupture strength of the batch coating layer 3 is 0.2kg/mm<2> to 2.5kg/mm<2>. When an optical cable is manufactured using the thin type of such optical fiber tape fibers, a larger number of optical fiber tape fibers can be enclosed in the optical cable, and as a result, the optical fibers can be enclosed in higher density.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-fiber separable optical fiber ribbon.

[0002]

2. Description of the Related Art Conventionally, in order to store optical fiber strands in an optical cable at a high density, a plurality of optical fiber ribbons each having a plurality of optical fiber strands integrated into a tape are laminated and further laminated. A method of collecting a plurality of bodies and covering them to construct an optical cable is performed. In such an optical cable, in order to carry out the multi-fiber / single-fiber withdrawal of the optical cable, a single-fiber separable optical fiber ribbon has been used as shown in FIG.

Reference numeral 1 in FIG. 5 is an optical fiber ribbon. The optical fiber ribbon 1 is formed by arranging a plurality of optical fiber strands 2 in parallel and coating them with a collective coating layer 3 made of an ultraviolet curable resin or the like, and has a flat cross section. The optical fiber element wire 2 is formed by forming a primary coating layer 5 on the outer peripheral surface of a bare optical fiber 4 and further forming a secondary coating layer 6 made of a colored ultraviolet curable resin on the outer peripheral surface thereof. is there. In such an optical fiber tape core wire 1, in order to separate the optical fiber wires 2 ... Single core, the surface of the secondary coating layer 6 which is the outermost coating layer of the optical fiber wire 2 is formed. By applying a release agent or adding the release agent to the collective coating layer 3 in advance, as shown in FIG.
By tearing the collective coating layer 3 as shown in FIG. 3, each of the optical fiber strands 2 ... Can be easily taken out from the collective coating layer 3.

[0004]

However, in order to store the optical fiber strands 2 in the optical cable at a higher density, the thickness T ₁ of the optical fiber ribbon ₁ is set to be 1 from the outer diameter of the optical fiber strands 2. When it is made thin by about 20 μm, the mechanical strength becomes small. For example, when a plurality of optical fiber ribbons 1 are assembled into an optical cable,
When the optical fiber ribbon 1 is twisted, the collective coating layer 3
However, there is a problem in that the optical fiber strands 2 ... Are separated from the collective coating layer 3, which has been an obstacle to increasing the density of the optical cable.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an optical fiber ribbon which has a sufficient mechanical strength even though it is thin and which can separate the optical fiber strands from a single core. .

[0006]

The optical fiber tape core wire of the present invention is an optical fiber tape core wire in which a plurality of optical fiber element wires having an outermost coating layer are arranged in parallel and integrated by a collective coating layer, The adhesive force between the outermost coating layer and the collective coating layer of the optical fiber is 10 at 90 ° T-Peel strength.
and the g / cm or more and the breaking strength of the collective coating layer is characterized in that it is 0.2 kg / mm ² or more 2.5 kg / mm ² or less.

[0007]

In the optical fiber ribbon of the present invention, the adhesion between the outermost coating layer of the optical fiber element and the collective coating layer is 10 g / cm or more at 90 ° T-Peel strength. As a result, the optical fiber element wire and the collective coating layer are firmly adhered to each other. For example, when a plurality of optical fiber tape core wires are assembled to manufacture an optical cable, the collective coating layer is twisted even if the optical fiber tape is twisted. Is not broken, and the optical fiber element wires are prevented from separating from the collective coating layer. Further, since the breaking strength of the collective coating layer of the optical fiber tape core is 2.5 kg / mm ² or less, the collective coating layer can be torn and the strength of the collective coating layer is 0.2 kg / mm ^2. With the above, the mechanical strength becomes sufficient.

The 90 ° T-Peel strength in the present invention is a value measured by the T-Peel measuring method as shown in FIG. To perform this T-Peel measurement,
A material for forming the outermost coating layer of the optical fiber element wire is applied onto the glass plate 7, and the material is cured to give a sheet 8 having a thickness of about 10 μm.
Is formed, and the material forming the collective coating layer is applied thereon,
This is cured to form a sheet 9 having a thickness of about 50 μm. Then, after making a strip-shaped cut having a constant length and a width W ₁ of 1 cm in the sheet 9, one end of the cut is peeled off and the fixed length is bent at 90 ° to form a bent portion 9a. Next, the tip of the bent portion 9a is pulled to peel off the whole, and the value obtained by dividing the tensile force at peeling by the width W ₁ is 9
The strength is 0 ° T-Peel.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 2 shows an embodiment of the optical fiber ribbon according to the present invention. The optical fiber ribbon 11 shown in FIG. 2 is different from the optical fiber ribbon 1 shown in FIG. The thickness T ₂ is as thin as about 280 μm, and the adhesive force between the secondary coating layer 6 which is the outermost coating layer of the optical fiber element 2 and the collective coating layer 3 is 1 at 90 ° T-Peel strength.
And 0 g / cm or more, and a point where the breaking strength of the collective coating layer 3 and 0.2 kg / mm ² or more 2.5 kg / mm ² or less.

In order to make the adhesive force between the secondary coating layer 6 and the collective coating layer 3 10 g / cm or more at 90 ° T-Peel strength, silicone is used as the colored ultraviolet curable resin forming the secondary coating layer 6. A system release agent and a polar monomer are added, and the addition amounts thereof are adjusted so that the adhesion is within the above range. Examples of the polar monomer used here include N-vinylpyrrolidone and N-vinylcaprolactam.

The collective coating layer 3 has a breaking strength of 0.2 k.
In order to adjust the breaking strength to be within the above range, the ratio of the soft segment in the main chain of the oligomer of the base resin is, for example, composed of an ultraviolet curable resin of g / mm ² or more and 2.5 kg / mm ² or less. It is done by lowering.

Such an optical fiber tape core wire 11 is
The adhesive force between the secondary coating layer 6 and the collective coating layer 3 is 90 ° T.
-By having a Peel strength of 10 g / cm or more,
The optical fiber strands 2 ... and the collective coating layer 3 are firmly bonded to each other. For example, when a plurality of optical fiber ribbons 11 are assembled to manufacture an optical cable, the optical fiber tape 11 is twisted. Even if the collective coating layer 3 is not broken, it is possible to prevent the optical fiber element wires 2 ... from separating from the collective coating layer 3. Further, by the breaking strength of the collective coating layer 3 is 0.2 kg / mm ² or more 2.5 kg / mm ² or less, the mechanical strength is sufficient even thin it is possible to tear easily collective coating layer 3 . Therefore,
By tearing the collective coating layer 3 between the optical fiber strands 2 and the optical fiber strands 2, the optical fiber strands 2 ... Can be separated into single cores as shown in FIG.
When an optical cable is manufactured by using such a thin optical fiber tape core wire 11, it is possible to store a larger number of optical fiber tape core wires in the optical cable as compared with the conventional one, and as a result, the number of optical fiber element wires is increased. Can be stored at high density.

(Test Example) A primary coating layer 5 made of an ultraviolet curable resin was formed on the outer peripheral surface of a single mode optical fiber having an outer diameter of 125 μm, and further silicone oil and a fluorine-based release agent were added to the outer peripheral surface thereof. An ultraviolet curable ink is applied to a thickness of 5 μm to form a secondary coating layer 6,
The optical fiber strand 2 is used. At this time, the outer diameter of the primary coating layer 5 is 250 μm, and the outer diameter of the optical fiber element wire 2 is 260 μm.
was μm. Then, eight such optical fiber element wires 2 are prepared, and these are arranged in parallel and passed through a die to form a collective coating layer 3 made of an ultraviolet curable resin to form an eight-core fiber similar to that shown in FIG. The optical fiber ribbon 11 was obtained.
At this time, the amounts of the silicone oil and the fluorine-based release agent added in the UV-curable ink were changed so that the adhesive force between the secondary coating layer 6 and the collective coating layer 3 was 0.3-at 90 ° T-Peel strength. It was changed in the range of 300 g / cm. Further, as the ultraviolet curable resin forming the collective coating layer 3, those having different breaking strengths in the range of 0.1 to 5.0 kg / mm ² were used. The width W ₂ of the optical fiber ribbon 11 is 2.1.
mm and thickness T ₂ were constant at 0.28 mm.

Next, the optical fiber ribbon 11 thus obtained was examined for single-fiber separation characteristics and twisting strength.

The single-fiber separation characteristic is obtained by manually tearing the collective coating layer 3 between the optical fiber strands 2 and the optical fiber strands 2 as shown in FIG. Investigate whether it is possible or impossible to separate single cores. ○ is possible, and × is impossible.
Then, as shown in FIG. 6, the one in which the optical fiber element wires 2 ... Separate from the collective coating layer 3 was evaluated as a separated state. The results are shown in Table 1 below.

The twisting strength is determined by using a twisting tester 20 as shown in FIG. 4 and fixing both ends of the optical fiber ribbon 11 having a length of 1 m to the above twisting tester 20 to obtain a span 20c.
The presence or absence of breakage when twisted to m, pitch 1 cm was investigated, and those not broken were evaluated as ◯, and those broken were evaluated as x. The results are shown in Table 1 below.

[0017]

[Table 1]

As is clear from the results shown in Table 1, the adhesion between the secondary coating layer 6 of the optical fiber element 2 and the collective coating layer 3 is 10 g / cm or more at 90 ° T-Peel strength, and collective coating layer 3 of the breaking strength is 0.2 kg / mm ² or more 2.5 kg / mm ² or less of the optical fiber ribbon satisfies the condition that the intensity twisting even thin and excellent good mechanical strength It was also confirmed that the single core separation characteristics were excellent.

Further, when the optical fiber tape core wires having excellent mechanical strength and single core separation characteristics and having a length of 500 m are bundled and put in an oven, the temperature range is changed from -40 ° C to + 60 ° C. The loss temperature characteristics for measuring the loss increase were investigated, and all had good characteristics with no increase in loss observed at low temperature and high temperature.

[0020]

As described above, in the optical fiber ribbon according to the present invention, the adhesive force between the outermost coating layer and the collective coating layer of the optical fiber element is within the above range. The wire and the collective coating layer are firmly bonded,
For example, when an optical cable is manufactured by gathering a plurality of optical fiber tape core wires, the collective coating layer is not broken even if the optical fiber tape is twisted, and the optical fiber element wires are separated from the collective coating layer. Can be prevented. Further, when the breaking strength of the collective coating layer is within the above range, the collective coating layer can be torn and the mechanical strength is sufficient even if it is thin. Therefore, by tearing the collective coating layer between the optical fiber strands, the optical fiber strands can be single-core separated. When an optical cable is manufactured using such a thin optical fiber tape core wire, it is possible to store a larger number of optical fiber tape core wires in the optical cable as compared with the conventional one, and as a result, the optical fiber element wire is Can be stored at a higher density.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a T-Peel measuring method.

FIG. 2 is a cross-sectional view showing an embodiment of the optical fiber ribbon according to the present invention.

FIG. 3 is a diagram for explaining a state in which a single optical fiber is separated from the optical fiber ribbon as shown in FIG.

FIG. 4 is a diagram showing a twisting test apparatus.

FIG. 5 is a cross-sectional view showing an example of a conventional optical fiber ribbon.

FIG. 6 is a diagram for explaining a state in which a single optical fiber is separated from the conventional optical fiber tape core wire shown in FIG.

[Explanation of symbols]

2 ... Optical fiber element wire, 3 ... Collective coating layer, 6 ... Secondary coating layer (outermost coating layer), 11 ... Optical fiber tape core wire

Front page continuation (72) Inventor Shinji Araki 1440 Rokuzaki, Sakura City, Chiba Fujikura Ltd. Sakura Factory

Claims (1)

[Claims] 1. An optical fiber tape core wire in which a plurality of optical fiber element wires each having an outermost coating layer are arranged in parallel and integrated by a collective coating layer, wherein the outermost coating layer and the collective coating layer of the optical fiber element wires are provided. and wherein the adhesion between is 90 ° T-Peel strength 10 g / cm or more and the breaking strength of the collective coating layer is 0.2 kg / mm ² or more 2.5 kg / mm ² or less and Fiber optic ribbon cable.