JP2002328283A - Divided optical fiber ribbon - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a divided optical fiber ribbon which is suppressed in the isolation of optical fibers in dividing and is improved in blocking resistance. SOLUTION: This divided optical fiber ribbon is constituted by coating and integrating a plurality of optical fibers with package coating resin layers consisting of UV curing resins in the state of arranging these optical fibers in parallel to form optical fiber ribbons, then coating and integrating such optical fiber ribbons with connecting resin layers in the state of arranging plural sheets of the optical fiber ribbons in parallel. The connecting resin layers consist of the UV curing resins reformed by 1 to 2 wt.% reactive silicone and the 90 deg. peel strength thereof is 0.1 to 0.3 N/mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape-shaped optical fiber in which a plurality of optical fibers are arranged in parallel and coated at a time, and a plurality of optical fibers are arranged in parallel and covered with a coupling resin layer, thereby enabling division. The present invention relates to an integrated split optical fiber tape.

[0002]

2. Description of the Related Art With the increase in optical communication networks, demand for optical fiber cables is increasing. The optical fiber cable includes
Tape-shaped optical fibers are often used. The tape-shaped optical fiber has a structure in which a plurality of optical fibers are arranged in parallel, and the outer periphery thereof is collectively covered in a tape shape with an ultraviolet curable resin such as urethane acrylate resin. An optical fiber cable is formed by connecting such a tape-shaped optical fiber to a spiral groove of a rod-shaped spacer or SZ.
It is housed in a groove. The use of a tape-shaped optical fiber has the advantage that a high-density (small-diameter, multi-core) optical fiber cable can be easily realized, and that connection can be easily performed in units of tape.

In recent years, the number of optical fibers to be coated at once has been increasing, and in order to improve the workability at the time of connection, a plurality of tape-shaped optical fibers are arranged in parallel with an ultraviolet curable resin. There has been proposed a split type optical fiber tape which is covered with a connecting resin layer made of and integrated. Such a split-type optical fiber tape can connect several times more optical fibers than the tape-shaped optical fiber at a time, and if necessary, tear the connecting resin layer to form individual tape-shaped optical fibers. It can be split into optical fibers.

FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of a conventional general split type optical fiber tape 21.
2A shows an example before division, FIG. 2B shows an example after division, FIG.
(C) shows another example after division in a simplified manner. In FIG.
Four optical fibers 22a arranged in parallel with each other
To 22d and 22e to 22h are collectively covered with resin layers 23a and 23a.
A split-type optical fiber tape in which two four-core optical fibers 24 and 25 formed by coating with 3b and integrated are covered with a connecting resin layer 26 in a state of being arranged in parallel and integrated. 21 is shown. The above-described division into individual tape-shaped optical fibers is performed by first piercing the resin layer for connection at the end of the split type optical fiber tape, and then separating the two side portions of the rupture due to the piercing. By pulling as described above, the crack is advanced by a predetermined length in the longitudinal direction of the optical fiber tape, and the connection resin layer is torn by a desired length. The above division is
This is performed using a conventionally known separating tool or at the fingertip.

However, the eight-fiber split optical fiber tape 21 shown in FIG.
When the optical fiber 22d, 2
2e, it is difficult to divide only the connecting resin layer by tearing, and if it is attempted to divide the optical fiber tape 21 over a length of 1 m to 3 m along the longitudinal direction,
As shown in FIG. 2B, the optical fiber may be damaged by the collective coating resin layer 23a, or in some cases, the optical fiber may be exposed due to the damage of the collective coating resin layer as shown in FIG. Often isolated. Isolation of the optical fiber can be avoided if the operator performs the division operation carefully with the fingertip. However, when the division is to be performed over 1 m to 3 m, the division tends to be performed at once by a strong force. Therefore, the above problem still often occurs. When the optical fiber is isolated, that part must be discarded, and the division work must be performed again, which lowers the yield of the optical fiber at the time of laying and wiring.

[0006] In the split type optical fiber tape, the connection resin layer is formed of an ultraviolet curable resin such as a urethane acrylate resin for the purpose of improving productivity. Has tackiness (stickiness),
Due to the large coefficient of friction, the surface has poor slipperiness, causing a blocking phenomenon (sticking between split-type optical fiber tapes) and winding disturbance when wound on a bobbin, resulting in uneven stress on the split-type optical fiber tape. Various problems have arisen, for example, when the optical fiber cable is manufactured, and when the optical fiber cable is manufactured, it becomes difficult to insert the split type optical fiber tape into the spiral groove of the rod-shaped spacer.

For this reason, when manufacturing an optical fiber cable,
Prior to winding on a bobbin, a lubricating lubricant (eg, powder such as talc, silicone oil, low molecular weight wax, etc.) is applied directly to the surface of the split-type optical fiber tape to obtain a surface slipperiness. Improvements have been made.

However, in the method of applying a powdery lubricant such as talc to the surface of a split-type optical fiber tape, the fine powder is uniformly dispersed in a short time before the optical fiber tape is wound on a bobbin. Is difficult to apply. As a result, the amount of the lubricant applied tends to be non-uniform, and microbending may instead occur. Further, the powder excessively adhering to the surface of the split type optical fiber tape is easily peeled off and scattered in the atmosphere, which not only causes a failure of the equipment but also impairs a worker's health. Therefore, as a measure against scattering, attempts have been made to uniformly disperse these powders in a volatile solvent to prepare a dispersion (for example, to uniformly disperse talc in methanol, ethanol, or the like), and to apply the dispersion. Was. However, these powders have a high sedimentation speed, so that the dispersion liquid becomes non-uniform immediately (talc easily sediments due to the large difference between its specific gravity and the specific gravity of methanol, etc.), and the powder must be applied uniformly. Was difficult.

In the method of applying a liquid lubricant such as silicone oil, the silicone oil itself is
Although it has a small amount of volatility, and diffuses into the connecting resin layer, the amount of silicone oil remaining on the surface of the connecting resin layer decreases over time,
There is a problem that a blocking phenomenon occurs.

In addition, in the method of applying a low molecular weight wax, it is necessary to dissolve the wax in a highly volatile fluorocarbon solvent. At present, such a fluorocarbon solvent is regulated as one of the causes of environmental destruction. It is impossible to use.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to suppress the isolation of an optical fiber at the time of division,
Another object of the present invention is to provide a split-type optical fiber tape having improved blocking resistance.

[0012]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have completed the present invention. The present invention is as follows. (1) A connecting resin in a state where a plurality of optical fibers are arranged in parallel and a plurality of tape-shaped optical fibers are integrally coated by being coated with a collective coating resin layer made of an ultraviolet curable resin. A split type optical fiber tape which is coated and integrated with a layer, wherein the connecting resin layer is made of an ultraviolet curable resin modified with 1% to 2% by weight of reactive silicone, 90 degree peel strength of 0.1N /
mm-0.3 N / mm. (2) The split type optical fiber tape according to the above (1), wherein the tensile elongation of the connecting resin layer is 30% or more.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
FIG. 1 is a cross-sectional view perpendicular to the longitudinal direction of a split type optical fiber tape 1 of a preferred example of the present invention. FIG. 1 (a) is a simplified view before splitting, and FIG. 1 (b) is a simplified view after splitting. FIG. 1 shows four optical fibers 2 arranged in parallel with each other.
Two four-core tape-shaped optical fibers 4 and 5 formed by coating a to 2d and 2e to 2h with a batch coating resin layer 3a and 3b made of an ultraviolet curable resin and integrating them are arranged in parallel. FIG. 2 shows a split type optical fiber tape 1 which is covered with a coupling resin layer 6 in a state and integrated. The coupling resin layer 6 in the split type optical fiber tape 1 of the present invention is made of an ultraviolet curable resin modified with 1% by weight to 2% by weight of a reactive silicone, and has a 90 ° peel strength of 0.1 N /.
mm to 0.3 N / mm.

In the split type optical fiber tape 1 of the present invention, the connecting resin layer 6 has a 90 degree peel strength (adhesive force) smaller than that of the conventional type (for connecting a conventional general split type optical fiber tape). 90 degree peel strength in resin layer:
(Approximately 0.3 N / mm to 0.5 N / mm).
When it is attempted to divide the tape-shaped optical fibers 4 and 5, the coupling resin layer 6 is more easily peeled from the collective coating resin layers 3a and 3b than in the conventional case. Further, in the present invention,
The coupling resin layer 6 is formed of an ultraviolet curable resin modified with reactive silicone, and the reactive silicone tends to have a high concentration at the interface of the coupling resin layer 6.
Therefore, an apparent silicone thin film exists between the connection resin layer 6 and the collective coating resin layers 3a and 3b, and an interface between the connection resin layer 6 and the collective coating resin layers 3a and 3b is formed. It facilitates peeling. As described above, in the present invention, the action of improving the releasability of the connection resin layer 6 itself from the collective coating resin layers 3a and 3b by setting the 90-degree peel strength within the above range, and the effect of the inside of the connection resin layer 6 Is present at a high concentration at the interface between the resin and the package resin layer 3a, 3b.
Along with the effect of improving the releasability from the a and 3b, by tearing the connecting resin layer 6, the two tape-shaped optical fibers 4,
5, the stress between the connection resin layer 6 and the collective coating resin layer may be smaller than the stress breakdown in the collective coating resin layer and / or the interface failure between the collective coating resin layer and the optical fiber. At the interface can easily occur.
Therefore, even if the worker does not perform the dividing work carefully with the fingertips as in the prior art, as shown in FIG.
And the batch-coated resin layer can be smoothly separated, and the optical fiber can be stably divided into tape-shaped optical fibers without isolation. As described above, according to the present invention, the efficiency of the division work of the split type optical fiber tape is improved, and a high yield of the optical fiber at the time of laying and wiring can be realized.

As described above, in the present invention, since the reactive silicone contained in the connecting resin layer 6 is present at a high concentration on the surface, the outer surface 6a of the connecting resin layer 6 (that is, the split type The outer surface of the optical fiber tape 1 is provided with a slipperiness, so that various problems caused by a direct application of a lubricant having a lubricating property, which have been conventionally performed, do not occur, and when the tape is wound around a bobbin, It is possible to realize a split type optical fiber tape (or a split optical fiber) in which the blocking phenomenon and the winding disorder do not occur and the rod-shaped spacer can be smoothly inserted into the spiral groove at the time of manufacturing the optical fiber cable.

If the 90-degree peel strength is less than 0.1 N / mm, unintended peeling occurs between the connecting resin layer 6 and the collectively covering resin layers 4 and 5 during manufacturing or handling. The 90 degree peel strength is 0.3 N / m.
If it exceeds m, meandering of cracks will occur at the time of division,
Isolation of the optical fiber is likely to occur.

The 90-degree peel strength is determined according to JIS Z
The measurement can be performed, for example, according to the following procedure in accordance with the measurement method specified in 0237. First, the resin material used for the collective coating resin layer is applied to a glass plate at a thickness of 200 μm, and is cured by irradiating it with ultraviolet rays of 300 mJ / cm ² (this cured product is hereinafter referred to as “collective coating resin”). May be called.) Subsequently, the resin material (including the reactive silicone) used for the connection resin layer was applied to the above-mentioned resin for collective coating in a thickness of 50 μm, and 300 mJ was applied thereto.
/ Cm ² of ultraviolet light to cure (this cured product is
Hereinafter, it may be referred to as “connection resin”. ) To form a test piece. The width of the test piece is set to, for example, 25 mm. The laminate of the glass plate, the resin for collective coating and the test piece (resin for connection) is fixed to a predetermined jig, and the end of the test piece is slightly peeled off from the resin for collective coating to form a play portion. The load required for peeling off the test piece from the resin for collective coating is measured by pulling the play portion in the direction perpendicular to the glass plate by sandwiching it between the upper grips of the tensile tester. The measured values are obtained by averaging the loads from the 20 mm portion to the 120 mm portion except for the portion 20 mm from the tension starting point, and excluding the 5 mm portion before the end of the tear. From this measured value, the average tear load was determined by averaging the tear load at the middle 50 mm portion by the optimal straight line method described in JIS K 6854, and the average tear load was divided by the width of the test piece. Strength.

The UV-curable resin used for forming the connecting resin layer 6 is not particularly limited as long as it can be modified with reactive silicone. For example, a urethane acrylate resin, an ester acrylate resin, Examples thereof include an epoxy acrylate resin, a butadiene acrylate resin, and a silicone acrylate resin.

The reactive silicone used for modifying the ultraviolet-curable resin forming the connection resin layer 6 is a polysiloxane modified with an organic compound such as amino-modified, epoxy-modified, carboxyl-modified, acrylic-modified, mercapto-modified or phenol-modified. Refers to a silicone modified by a group. The reactive silicones include those having an organic group introduced only into the side chain of polysiloxane, those having been introduced at both ends, those having been introduced at one end (one end), and those introduced at the side chain and the end. Any one of these may be used, but the silicone resin having an organic group introduced at one end is capable of effectively modifying the surface of the coupling resin layer 6 without greatly reducing the mechanical strength of the ultraviolet curable resin. (One-end reactive silicone).

As such modified silicone, for example, a 3- (2'-hydroxyethoxy) propyl group, a 3- (2 ', 3'-dihydroxypropyloxy) propyl group, a 3- (2'-ethyl) -2'-hydroxymethyl-3-hydroxy) propyl group and 3-
One end has a hydroxyl group, such as polydimethylsiloxane having an organic group such as (2'-hydroxy-3'-isopropylamino) propyl group and an unreactive organic group such as a trimethylsilyloxy group at the other end. And reactive silicone having the same. The reactive silicone having a hydroxyl group at one end as described above is, for example, Silaplane F
M-0411, FM-0421, FM-0425, FM
-D411, FM-D421, FM-D425 (above,
Chisso Corporation), TSL9105 (Toshiba Silicone Corporation), Shin-Etsu Silicone X-22-170A, X-
22-170B, X-22-170D, X-22-17
6B, X-22-176D, X-22-176DX, X
Commercially available products such as -22-178A and X-22-178B (all manufactured by Shin-Etsu Chemical Co., Ltd.) and BX16-192 (manufactured by Toray Downing Silicone Co., Ltd.) are also available.

The method of modifying the ultraviolet-curable resin with the reactive silicone includes various oligomers and monomers, a polymerization initiator, and, if necessary, an antioxidant, a storage stabilizer, an ultraviolet absorber, and an interface. Activators, leveling agents,
Before preparing a resin composition by mixing a colorant, a silane coupling agent and the like, a method of mixing as one component thereof, or a method of incorporating it into various oligomers may be used.

In the present invention, the connecting resin layer 6 having a 90-degree peel strength within the above range is formed by adding one part to the ultraviolet curing resin.
It is prepared by adding the reactive silicone in the range of 2% by weight to 2% by weight. If the added amount of the reactive silicone is less than 1% by weight, the 90-degree peel strength of the formed connecting resin layer 6 cannot be reduced to the above range, or the peeling property of the interface with the collectively coated resin layer can be reduced. There is a problem that the improvement and the improvement of the slipperiness of the outer surface of the connecting resin layer are insufficient. If the amount of the reactive silicone exceeds 2% by weight, the 90-degree peel strength of the formed connecting resin layer 6 becomes too small, or the adhesiveness with the collectively coated resin layer is low, resulting in the production. There is a problem that undesired peeling occurs between the collective coating resin layer and the connection resin layer during or during handling. The silicone thin film apparently present on the surface of the connecting resin layer is made of XPS (X-ray Ph.
otoelectron Spectroscopy;
(X-ray photoelectron spectroscopy).

In the split type optical fiber tape 1 of the present invention, the tensile elongation of the connecting resin layer 6 is preferably 30% or more. If the tensile elongation of the connecting resin layer is less than 30%, it is not preferable because cracks may meander during division.

The tensile elongation is measured in accordance with JIS K 711.
The measurement can be performed, for example, according to the following procedure according to the measurement method specified in 3. First, the resin material (including reactive silicone) used for the connection resin layer is applied on a glass plate to a thickness of 200 μm, and 300 mJ / cm ²
After irradiating with ultraviolet rays, the resin sheet is peeled off from the glass plate to obtain a resin sheet. This resin sheet is JIS
The test piece is punched into the shape of the test piece (No. 2) described in K7127. The distance between the marked lines is set to 25 mm, the tensile tester is used to pull at a tensile speed of 50 mm / min, the elongation at break is measured, and the tensile elongation of the test piece is calculated.

The connection resin layer 6 having the specific tensile elongation described above is realized by selecting an ultraviolet curable resin having such a tensile elongation from the above-described ultraviolet curable resins. In the present invention, the coupling resin layer 6 is formed of an ultraviolet curable resin modified with 1% by weight to 2% by weight of a reactive silicone. The tensile elongation of the connecting resin layer does not change before and after the addition of the conductive silicone.

As the optical fiber used in the split type optical fiber tape of the present invention, a conventionally known optical fiber can be suitably used regardless of a single mode optical fiber or a multimode optical fiber, and is not particularly limited.

As the resin material forming the collective coating resin layer used in the split type optical fiber tape of the present invention, it has been conventionally used for the collective coating resin layer of the split type optical fiber tape and the tape-shaped optical fiber. ,
For example, an ultraviolet curable resin such as a urethane acrylate resin or an epoxy acrylate resin can be suitably used.

Further, in the present invention, the connecting resin layer and the collectively covering resin layer are both 600 MPa to 1200 M
It is preferable that the connection resin layer has the same size selected from the range of Pa or the connection resin layer has a higher Young's modulus. As described above, the Young's modulus of the connecting resin layer is larger than that of the related art (the Young's modulus of the connecting resin layer in the conventional split optical fiber tape: about 150 MPa to 250 MPa, and the Young's modulus of the collectively coated resin layer: 700 MPa to 900 MPa).
Degree) The split type optical fiber tape of the present invention having the realized coupling resin layer and the collectively coated resin layer is formed as a whole (particularly the coupling resin layer) harder than the conventional one. , It is difficult to bend (has excellent lateral pressure characteristics) by the action of lateral pressure (pressure acting substantially perpendicular to the direction in which the optical fibers are arranged in parallel), and transmission loss due to lateral pressure can be reduced. In the split type optical fiber tape of the present invention,
For example, OTDR (optical time dom
transmission loss measured at a measurement wavelength of 1.55 μm using an A.in reflectometer) is 0.2 dB.
/ Km or less.

From the viewpoint of division stability, the Young's modulus is 600 MPa to 120, both in the above range.
It is preferable to select from the range of 0 MPa. In the present invention, when the Young's modulus of the collective coating resin layers 3a and 3b is larger than the Young's modulus of the connection resin layer 6, the transmission loss may increase due to microbending, which is not preferable. Further, in the present invention, the collective coating resin layers 3a, 3b
If the Young's modulus of at least one of the connection resin layers 6 is less than 600 MPa, transmission loss may increase due to microbending, which is not preferable.
If the Young's modulus of at least one of the collective coating resin layers 3a and 3b and the connection resin layer 6 exceeds 1200 MPa, the transmission loss may increase due to microbending, which is not preferable.

The Young's modulus of the connecting resin layer and the collective coating resin layer can be measured by, for example, the following procedure, for example, by a measuring method in accordance with JIS K 7113. The resin material used for the connection resin layer or the batch coating resin layer (including the reactive silicone when used for the connection resin layer) is placed on a glass plate for 200 minutes.
It is applied in a thickness of μm and is cured by irradiating it with ultraviolet rays at 300 mJ / cm ² , and then peeled off from the glass plate to obtain a resin sheet. JIS K
The test piece was punched out in the shape of the test piece (No. 2) described in 7127. The test piece is pulled at a pulling speed of 1 mm / min using a tensile tester, the load at 2.5% elongation is measured, and the Young's modulus is calculated.

When the Young's modulus of the connecting resin layer is larger than the Young's modulus of the collectively coated resin layers 3a and 3b, the difference is preferably 300 MPa or less. The Young's modulus of the connecting resin layer is 3 times smaller than the Young's modulus of the batch coating resin layer.
If it is larger than 00 MPa, the transmission loss tends to increase due to microbending, which is not preferable.

The connecting resin layer 6 and the collectively covering resin layers 3a and 3b having the above-mentioned specific Young's modulus are realized by selecting such a resin from the above-mentioned ultraviolet curable resins. As described above, in the present invention,
The coupling resin layer 6 is formed of an ultraviolet curable resin modified with 1% to 2% by weight of a reactive silicone, but the addition amount is in the above range. After the addition, the Young's modulus of the connecting resin layer does not change.

In the present invention, the number of optical fibers coated with the collective coating resin layer for one tape-shaped optical fiber is not particularly limited, and a plurality of optical fibers are appropriately selected. Further, the number of tape-shaped optical fibers covered with the coupling resin layer in one split-type optical fiber tape is not particularly limited, and a plurality of tape-shaped optical fibers are appropriately selected.

[0034]

The present invention will be described in detail with reference to the following examples, but the present invention is not limited to the following examples. Example 1 First, four single-mode optical fibers each having an outer diameter of 250 μm were arranged in parallel, and the outer periphery thereof was collectively covered with a urethane acrylate-based ultraviolet curable resin to form a collective covering resin layer having a width of 1.1 mm. Then, a tape-shaped optical fiber having a thickness of 0.3 mm was produced. Two pieces of this tape-shaped optical fiber,
In a state of being arranged in parallel, the outer periphery thereof is collectively coated with a urethane acrylate-based UV-curable resin (2.0% by weight of one end reactive silicone (BX16-192, manufactured by Toray Downing Silicone Co., Ltd.)). An eight-core split optical fiber tape having a width of 2.1 mm and a thickness of 0.3 mm as shown in FIG. 1A was obtained by coating to form a connecting resin layer. In the thus obtained split type optical fiber tape of Example 1, JIS Z 0237 described above was used.
90 degree peel strength of the connecting resin layer measured by a measuring method according to JIS, is 0.15 N / mm.
The tensile elongation of the connecting resin layer measured by a measuring method based on K7113 was 50%. The Young's modulus of the connecting resin layer was 650 MPa, and the Young's modulus of the batch coating resin layer was 650 MPa, as measured by the measurement method based on JIS K 7113 described above.

Example 2 A split type optical fiber tape was prepared in the same manner as in Example 1 except that the connecting resin layer was formed of a urethane acrylate UV curable resin to which 1.0% by weight of reactive silicone was added. Obtained. In the thus obtained split type optical fiber tape of Example 2, the 90-degree peel strength of the connecting resin layer measured in the same manner as in Example 1 was 0.25 N / mm, and the tensile elongation of the connecting resin layer was 0.25 N / mm. 50%, Young's modulus of connection resin layer is 670 MPa, Young's modulus of batch coating resin layer is 670 MPa
MPa.

Comparative Example 1 A split optical fiber tape was prepared in the same manner as in Example 1 except that the connecting resin layer was formed of a urethane acrylate-based ultraviolet curable resin containing 0.5% by weight of reactive silicone. Obtained. In the thus obtained split type optical fiber tape of Comparative Example 1, the 90 ° peel strength of the connecting resin layer measured in the same manner as in Example 1 was 0.35 N / mm, and the tensile elongation of the connecting resin layer was 0.35 N / mm. 50%, Young's modulus of the connecting resin layer is 500 MPa, Young's modulus of the collectively coated resin layer is 500
MPa.

Comparative Example 2 A split optical fiber tape was obtained in the same manner as in Example 1 except that the connecting resin layer was formed of an ultraviolet curable resin to which 3.0% by weight of reactive silicone was added. In the thus obtained split optical fiber tape of Comparative Example 2,
The 90-degree peel strength of the connecting resin layer measured in the same manner as in Example 1 was 0.05 N / mm, the tensile elongation of the connecting resin layer was 50%, the Young's modulus of the connecting resin layer was 500 MPa, and the batch-coated resin layer was used. Had a Young's modulus of 500 MPa.

The following evaluation tests were performed on the split optical fiber tapes obtained in Examples 1 and 2 and Comparative Examples 1 and 2. (1) Dividability evaluation test First, a 10 mm cut is made in the longitudinal direction in the connecting resin layer of each split type optical fiber tape using a split cutting tool, and the cut is made. Then, both sides of the cut are fingertips. It was pinched and pulled in the opposite direction for 5 m. Thereafter, the fracture surface of the divided portion was observed. In addition, the first tapping work uses a split taping tool that uses the shearing force of parallel blades.In this case, the fracture surface observation of the tapping part is the same as the fracture surface caused by subsequent tearing I went to. Without discriminating between the opening portion that was initially performed and the torn portion that was subsequently performed, the case where the division illustrated in FIG. 1B is performed over the entire torn 5 m fracture surface is evaluated as success, Fig. 2
In the case where the division in the mode exemplified in (b) and (c) is recognized, it was evaluated as failure. For each of the split optical fiber tapes of Examples 1 to 4 and Comparative Examples 1 to 4, 50 samples were prepared, and the number of passing samples was measured.

(2) Winding property on bobbin Using a manufacturing machine, the bobbin was actually wound and the appearance was observed to evaluate the winding property (slipperiness) on the bobbin. What was aligned winding without winding collapse is good,
Those which could not be aligned and wound even when the winding tension was changed, or those which had a blocking phenomenon were regarded as defective. Table 1 shows the test results of the above (1) and (2).

[0040]

[Table 1]

[0041]

As is apparent from the above description, according to the present invention, the isolation of the optical fiber at the time of division is suppressed,
Further, it is possible to provide a split type optical fiber tape having improved blocking resistance. By using such a split type optical fiber tape, the terminal processing of the optical fiber becomes easy, the installation and the wiring are made more efficient, and as a result, the construction period required for the installation and the wiring of the subscriber optical cable is shortened, In addition, installation and wiring costs are reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view perpendicular to the longitudinal direction of a split type optical fiber tape 1 of a preferred example of the present invention. FIG. 1 (a) shows a simplified view before splitting, and FIG.

FIG. 2 is a cross-sectional view perpendicular to the longitudinal direction of a conventional general split type optical fiber tape 21. FIG.
FIG. 2B shows an example after division, and FIG. 2C shows another example after division in a simplified manner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Split-type optical fiber tape 2a-2h Optical fiber 3a, 3b Collective coating resin layer 4,5 Tape-shaped optical fiber 6 Connecting resin layer

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Seiji Kawaguchi 4-3-1 Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Cable Industry Co., Ltd. Itami Works F-term (reference) 2H001 BB14 BB27 DD24 KK17 KK22 PP01 4G060 AA03 AC01 AD43

Claims (2)

[Claims] 1. A plurality of tape-shaped optical fibers, which are covered with a collective coating resin layer made of a UV-curable resin in a state where a plurality of optical fibers are arranged in parallel and integrated, are connected in a state where a plurality of optical fibers are arranged in parallel. A split type optical fiber tape which is coated and integrated with a resin layer for connection, wherein the resin layer for connection is made of an ultraviolet curable resin modified with 1% to 2% by weight of reactive silicone. , 9
A split type optical fiber tape having a 0 degree peel strength of 0.1 N / mm to 0.3 N / mm. 2. The split type optical fiber tape according to claim 1, wherein the tensile elongation of the connecting resin layer is 30% or more.