JP2007264227A - Optical fiber cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber cable which has an effect of completely preventing insertion of cicada ovipositors and is free from deviation between a tension member and a sheath and has good formability and appearance. <P>SOLUTION: An optical fiber cable 10 having a packaging sheath 15 provided on a coated optical fiber 11 and a tension member 13 has a bonding property giving agent B coated on a surface of the tension member 13 and has the sheath 15 provided on the agent B by a resin composition to which a bonding property is given, and the bonding property is given to the resin composition with polyurethane as a base, and the bonding property giving agent is a polyester or polyurethane system, and the resin composition is prepared by adding 4 to 13 pts.wt. of a flame retarder, 13 to 26 pts.wt. of a workability giving agent, and 3 to 13 pts.wt., preferably 5 to 10 pts.wt., of the bonding property giving agent to 100 pts.wt. of a heat resistant polyurethane. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical fiber cable, which relates to an optical fiber cable which prevents the spawning tube from being inserted into a spider and prevents an external force from acting on the optical fiber core wire during a pull-in operation.

  In recent years, there has been a strong demand for optical fiber cables that are easy to wire, have high mechanical strength, do not put a load on the optical fiber core, and can prevent the insertion of spider spawning tubes. In order to meet the demands, the present applicant has adopted a low-friction and high-strength resin composition (for example, polyurethane composition) as the material of the jacket, so that it can withstand the insertion and external force of spider laying tubes. (Japanese Patent Application No. 2005-287459) was proposed.

  Although it has been recognized that the above-mentioned proposal has improved the ability to prevent the insertion of spiders into the spawning tube and the resistance to tension and pressing during wiring, the adhesion between the tensile strength (steel wire) part of the optical fiber cable and the jacket In some cases, when the tensile strength (steel wire) part and the optical fiber cable body part are torn at the bridge part between them, a large load is applied to the optical fiber and transmission characteristics There was a fear of the problem of inviting a decline.

  In view of the above-mentioned problems of the prior art, the present invention can withstand external forces generated during the wiring of optical fiber cables, prevents the insertion of spider spawning tubes, and further performs work such as interfacing, drawing in, and terminal processing of optical fiber cables. It is an object of the present invention to provide an optical fiber cable that can sufficiently withstand the external force generated during the process.

  In order to solve the above-described problems, the present invention provides an optical fiber core wire 11, tension members 12 arranged along the longitudinal direction on both sides of the optical fiber core wire 11, and a tensile member 13 on an extension line connecting them. In the optical fiber cable 10 having a collective jacket 15 provided thereon, an adhesive agent B is applied to the surface of the strength member 13 and the jacket 15 is provided by a resin composition having an adhesive property provided thereon. The resin composition may be a polyurethane-based polyester or polyurethane-based adhesion-imparting agent, and the resin composition may contain 4 to 13 flame retardants per 100 parts by weight of polyurethane. Part, 13 to 26 parts by weight of the workability-imparting agent, and 3 to 13 parts by weight of the adhesion-imparting agent, preferably 5 to 10 parts by weight of the adhesion-imparting agent. In addition, the jacket 15 can be provided on the optical fiber core wire 11 after the inner coating 16 is formed thereon. Moreover, the adhesiveness imparting agent blended in the resin composition is preferably the same as the adhesiveness imparting agent applied to the surface of the tensile body.

  According to the present invention configured as described above, it can withstand external forces generated during wiring work such as interfering and drawing in an optical fiber cable, there is no spawning tube piercing of the spider, and the strength member portion during wiring work is completely eliminated. The work of tearing the optical cable body portion through the bridge can be easily performed without applying a load to the optical fiber core wire.

  Next, embodiments of the present invention will be described with reference to the drawings.

[Example 1]
In FIG. 1 (a), 11 is a two-core optical fiber in which two optical fiber cores having an outer diameter of 0.25 mm are arranged in parallel, and 12 is arranged at intervals on both sides of the optical fiber core. A tension member of a 45 mmφ aramid fiber reinforced plastic string, 13 is a 1.2 mmφ galvanized steel wire (strength member). On the galvanized steel wire 13, an outer jacket 15 b (outer diameter 2.0 mmφ) is integrally formed with the resin composition shown in Table 1 via a bridge 17.

  The outer cover 15a is formed with a V-shaped concave groove 14 that facilitates tearing of the outer cover in the length direction of the surface where a line perpendicular to the midpoint of the line connecting the two tension members 12 intersects. Yes. In the unlikely event that the laying tube is inserted, the minute gap G is provided as a refuge for the optical fiber core wire, but it may not be provided.

  The outer sheath is a two-core optical fiber core wire 11, a tension member 12, and a galvanized steel wire 13 introduced into an extrusion molding machine in parallel, and the galvanized steel wire is given adhesion before entering the crosshead. An agent (Admer VF500: trade name of Mitsui Chemicals Co., Ltd.) is applied (may be applied at a galvanized steel wire manufacturing plant), and the jackets 15a and 15b are integrally formed by an extrusion molding machine.

[Example 2]
In FIG. 1 (b), 11 is a two-core optical fiber in which two optical fiber cores having an outer diameter of 0.25 mm are arranged in parallel, and 12 is arranged at intervals on both sides of the optical fiber core. A tension member of a 45 mmφ aramid fiber reinforced plastic string, 13 is a 1.2 mmφ galvanized steel wire (strength body). The optical fiber core wire 11 and the tension member 12 have an elliptical cross section (short axis 2.4 mm). A jacket 15a having a long axis of 2.7 mm is formed on a galvanized steel wire, and a jacket 15b (having an outer diameter of 2.0 mmφ) is integrally formed with the resin composition shown in Table 1 via a bridge 17. Yes.

  The outer cover 15a is formed with a V-shaped groove 14 in the length direction of the surface where the minor axes intersect to facilitate tearing of the outer cover during construction. In the unlikely event that the laying tube is inserted, the minute gap G is provided as a refuge for the optical fiber core wire, but it may not be provided.

  For forming the outer sheath, a two-core optical fiber core wire 11, a tension member 12, and a galvanized steel wire 13 are introduced into an extrusion molding machine in parallel, and bonded to the galvanized steel wire before entering the crosshead. A property-imparting agent (Admer VF500: trade name of Mitsui Chemicals Co., Ltd.) is applied (may be applied at a galvanized steel wire manufacturing plant), and the jackets 15a and 15b are integrally formed by an extrusion molding machine.

Example 3
In FIG. 1C, 11 is a four-core optical fiber ribbon in which four optical fiber cores having an outer diameter of 0.25 mm are arranged in parallel, and 12 is arranged at both sides of the optical fiber ribbon. A tension member of a 0.45 mmφ aramid fiber reinforced plastic string, 13 is a 1.2 mmφ galvanized steel wire (strength body), and the cross section of the optical fiber core wire 11 and the tension member 12 is elliptical (short axis). The outer cover 15a (2.0 mm × long axis 4.0 mm) is integrally formed on the galvanized steel wire with the outer cover 15b (outer diameter 2.0 mmφ) via the bridge 17 by the resin composition shown in Table 1. Has been.

  The outer cover 15a is formed with a V-shaped groove 14 in the length direction of the surface where the minor axes intersect to facilitate tearing of the outer cover during construction. In the unlikely event that the laying tube is inserted, the minute gap G is provided as a refuge for the optical fiber core wire, but it may not be provided.

  For forming the jacket, the 4-core optical fiber ribbon 11, the tension member 12, and the galvanized steel wire 13 are introduced into the extrusion molding machine in parallel. An adhesiveness imparting agent (Admer VF500: trade name of Mitsui Chemicals Co., Ltd.) is applied (may be applied at a galvanized steel wire manufacturing plant), and the jackets 15a and 15b are integrally formed by an extrusion molding machine.

[Example 4 to Example 6]
2 (a) to 2 (c), 11 is a two-core optical fiber core or four-core optical fiber ribbon, 12 is a tension member, and an inner coating 16 is provided thereon, on which An outer cover 15a is provided.
Therefore, in these embodiments, first, an inner coating is formed with medium density polyethylene on the two-core optical fiber core wire or the four-core optical fiber tape core wire 11 and the tension member 12, and then the first to third embodiments. The casings 15a and 15b are extruded by the same procedure as in FIG. The configuration and the outer shape excluding the inner coating 16 are the same as those in the first to third embodiments.

The details of the ingredients used in Table 1 are as follows.
Heat-resistant PU
Processability imparting agent is amide elastomer Adhesion imparting agent is Admer VF500 (trade name of Mitsui Chemicals, Inc.)

The test items in Table 1 and details thereof are as follows.
Adhesion with steel wire: A sample of 30 cm is taken from the cable, the steel wire part is separated from the main body part, and the outer part of the steel wire part is peeled off leaving 1 cm, and the steel wire is the same as the outer diameter of the steel wire or The load when the die was fixed and the steel wire was pulled out at a speed of 50 mm / min was measured through a slightly larger inner diameter die hole.
Tearability: A 10 mm incision was made in the neck, and it was confirmed whether or not the neck could be torn without using a special tool.
Outer appearance: Judged by visual inspection.
Oviduct tube insertion cage: The presence or absence of insertion cage was confirmed visually.

  As described above, according to the present invention, the spawning tube insertion prevention effect of moths is 100% prevention effect, and the galvanized steel wire when the adhesion between the galvanized steel wire and the jacket is well negotiated- There is no deviation between the outer casings, the extrudability and the appearance are good, and the V-shaped groove is also made into a predetermined shape, so the outer casing can be torn reliably during construction, and the industrial utility value is extremely It is expensive.

In the sectional view of the optical fiber cable of the present invention, (a) is Example 1, (b) is Example 2, and (c) is Example 3. FIG. In the sectional view of the optical fiber cable of the present invention, (a) is Example 4, (b) is Example 5, and (c) is Example 6. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical fiber cable 11 Optical fiber (tape) core wire 12 Tension member 13 Galvanized steel wire (tensile body)
14 V-shaped groove 15a Outer sheath (optical fiber core side)
15b Jacket (galvanized steel wire side)
16 Inner coating B Adhesive agent coating layer G Micro gap

Claims (5)

  The optical fiber core wire (11), the tension member (12) disposed along the longitudinal direction on both sides of the optical fiber core wire (11), and the tensile body (13) on the extension line connecting them are collectively In an optical fiber cable (10) provided with a jacket (15), an adhesiveness-imparting agent (B) is applied to the surface of the tensile body (13), and the resin composition provided with adhesiveness on the surface is coated with the resin composition. An optical fiber cable comprising a cover (15).   2. The optical fiber cable according to claim 1, wherein the resin composition is formed by blending a polyester-based or polyurethane-based adhesion imparting agent based on polyurethane.   The resin composition is formed by blending 4 to 13 parts by weight of a flame retardant, 13 to 26 parts by weight of a workability imparting agent, and 3 to 13 parts by weight of an adhesiveness imparting agent with respect to 100 parts by weight of polyurethane. The optical fiber cable according to claim 1 or 2.   The optical fiber cable according to any one of claims 1 to 3, wherein a blending amount of the adhesiveness imparting agent is 5 to 10 parts by weight.   The optical fiber according to any one of claims 1 to 4, wherein an inner sheath (16) is formed on the optical fiber core wire (11), and the outer sheath (15) is provided directly on the outer periphery thereof. cable.

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