JP2006313314A - Monofilament for optical fiber communication cable member and optical fiber communication cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical fiber communication cable that can prevent optical conductor from being damaged by harmful insects such as bear cicada (cryptotympana japonesis) laying eggs inside the cable and that, when stretched for installation and connected, reveals flexibility comparable to a conventional cable. <P>SOLUTION: The monofilament 6 for optical fiber communication cable members is flat-shaped with a cross section of 0.2-5 mm in major axis and 0.1-0.5 mm in minor axis, is provided with a Young's modulus in the range of 1,000-12,000 N/mm<SP>2</SP>, and is arranged in a manner surrounding at least a part of the optical conductor 2 in the inside and/or the outer surface of the optical fiber communication cable 1 for which the optical conductor 2 and tension members 3 are covered with a sheath 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a monofilament for an optical fiber communication cable member and an optical fiber communication cable in which the monofilament is disposed in a part of the optical fiber communication cable.

  In recent years, an optical fiber communication cable is mainly used for a cable used for FTTH (fiber to the home) because a large amount of information can be instantaneously transmitted and received.

  As shown in FIG. 4, the optical fiber communication cable 1 generally includes an optical core wire 2 serving as an information transmission medium at the center and a cable member called a tension member 3 (or a reinforcing wire) for drawing into the house from a utility pole. In addition, the optical fiber 2 and the tension member 3 are covered with a member called a sheath 4.

  In addition, the sheath 4 is formed with a tear groove called a notch 5 for tearing the sheath 4 when the optical fiber communication cable 1 is connected to a receiving device or the like to expose the optical fiber. By being formed on the side surface of 4, the sheath 4 can be torn and the optical fiber 2 can be easily exposed.

  However, while optical fiber communication cables have been extended, in recent years, there has been an increase in damage caused by pests such as bear swallows laying egg laying tubes in fiber optic communication cables and laying eggs inside them. In addition to damaging the optical fiber, which plays an important role in information transmission, it will not only interfere with the transmission of information, but also rainwater will submerge inside the optical fiber communication cable through the wound hole opened by the laying tube and the optical fiber There are problems such as a significant decrease in the light transmission characteristics of the wire.

  In particular, since the thickness of the sheath between the optical fiber and the notch is thinner than in other places, when the egg is laid from the notch, the egg-laying tube easily reaches the optical fiber and causes great damage.

  As a countermeasure against this problem, a method has been attempted in which the sheath material is hardened and it is difficult for the bearfish to puncture the laying tube. However, when connecting an optical fiber communication cable, the sheath is difficult to tear. It was revealed that it was not practical.

  In addition, attempts have been made to increase the sheath thickness so that the oat laying tube does not reach the optical core, but by increasing the sheath thickness, the optical fiber communication cable becomes thicker and more flexible. When it is stretched, there is a problem that handling becomes difficult.

  Furthermore, in order to reduce the damage caused by the insertion of the oviduct from the notch, an attempt was made to not provide a notch, but no effect was observed.

Furthermore, a fiber optic drop cable in which a spicy component is contained in the sheath material or an insecticidal / insecticidal component is applied to the surface of the cable so that the cable is not bitten by birds, beasts and animals (see, for example, Patent Document 1) ) Is already known, but in reality, it has little effect on the prevention of spawning, such as burdock, and the actual situation is that countermeasures are continually required.
JP 2005-37526 A

  It is an object of the present invention to provide an optical fiber and a tension member such as a bear jemi when the optical fiber is arranged so as to surround at least a part of the optical fiber on the inner and / or outer surface of the optical fiber communication cable covered with a sheath. The optical fiber can be prevented from being damaged by insects spawning inside the fiber optic communication cable, and the same flexibility as the conventional fiber optic communication cable can be used when installing or connecting the fiber optic communication cable. Is to provide a monofilament for an optical fiber communication cable member and an optical fiber communication cable using the same.

In order to achieve the above object, according to the present invention, a monofilament made of a synthetic resin having a flat shape with a major axis of 0.2 to 5 mm and a minor axis of 0.1 to 0.5 mm, and JIS L1013 8. The Young's modulus measured in accordance with 8.10 is in the range of 1000 to 12000 N / mm ² , and the optical core wire and the tension member are covered with the sheath on the inner and / or outer surface of the optical fiber communication cable. A monofilament for an optical fiber communication cable member is provided, which is arranged so as to surround at least a part.

In the monofilament for optical fiber communication cable member of the present invention,
The tensile strength measured according to JIS L1013 8.5 is 50 to 150 N, and the dry heat shrinkage at 140 ° C. measured according to JIS L1013 8.18.2 is in the range of 0.3 to 3.0%. There is,
The synthetic resin is a polyester-based resin, particularly polyethylene terephthalate and / or polybutylene terephthalate,
The synthetic resin is polyphenylene sulfide;
It is preferable that the synthetic resin is at least one selected from polyamide resins, particularly 6 nylon, 66 nylon, and 610 nylon, and further excellent effects can be obtained by satisfying these conditions. be able to.

  Furthermore, the optical fiber communication cable according to the present invention provides the above-described monofilament for an optical fiber communication cable member, at least a part of the optical fiber on the inner and / or outer surface of the optical fiber communication cable in which the optical fiber and the tension member are covered with a sheath. It is characterized by being arranged so as to surround.

  Since the monofilament for an optical fiber communication cable member of the present invention is a monofilament having a flat cross-sectional shape and sufficient strength and flexibility, the optical fiber and the tension member are covered with a sheath by the optical fiber and the tension member. When the optical fiber cable is arranged so as to cover at least a part of the optical fiber cable on the inside and / or outer surface of the optical fiber cable, the optical fiber cable is caused by spawning of insects such as bear swallows inside the optical fiber communication cable. In addition to preventing damage, an optical fiber communication cable having flexibility equivalent to that of a conventional optical fiber communication cable and easy to handle can be obtained when the optical fiber communication cable is stretched and connected.

  Hereinafter, the monofilament for an optical fiber communication cable member of the present invention and an optical fiber communication cable using the same will be described.

  FIG. 1 is a cross-sectional view showing an example of an optical fiber communication cable according to the present invention, wherein 1 is an optical fiber communication cable, 2 is an optical fiber, 3 is a tension member, 4 is a sheath, 5 is a notch, and 6 is an optical fiber communication cable. The monofilament for members is shown respectively.

  Unlike the conventional optical fiber communication cable 1 described above with reference to FIG. 4, the optical fiber communication cable 1 in FIG. 1 is provided with a monofilament 6 for an optical fiber communication cable member having a flat cross section between the optical fiber 2 and the notch 5. It has a structured.

  The monofilament 6 for the optical fiber communication cable member is formed by the damage of the optical core wire 2 caused by laying the egg-laying tube from the side surface of the fiber-optic communication cable 1 by a bear swallow or the like, or by the egg-laying tube. It plays a role in preventing rainwater from entering the inside of the optical fiber communication cable 1 through the opened flaws and affecting the light transmission characteristics of the optical core 2.

  Here, as the synthetic resin constituting the monofilament 6 for the optical fiber communication cable member of the present invention, for example, 6 nylon, 66 nylon, 610 nylon, 612 nylon, nylon 6/66 copolymer, nylon 6/12 copolymer Alternatively, two or more kinds of these copolymerized or blended polyamide resins, polyethylene terephthalate (hereinafter referred to as PET), polybutylene terephthalate (hereinafter referred to as PBT), polyethylene naphthalate, polypropylene terephthalate, polymethylene naphthalate, polybutylene naphthalate , Polypropylene naphthalate or polyester resins copolymerized or blended with two or more of these, polypropylene, polyolefin resins such as low density and high density polyethylene, syndiotactic Polystyrene having atactic or isotactic structure, polyphenylene sulfide (hereinafter referred to as PPS), polystyrene / polybutadiene / polystyrene block copolymer, polystyrene / polyisoprene / polystyrene block copolymer, styrene thermoplastic elastomer, ethylene / propylene / diethylene copolymer, etc. Polyolefin thermoplastic elastomers such as blends of olefinic rubbers with polypropylene or polyolefins such as ethylene, polyurethane thermoplastic elastomers, polyester thermoplastic elastomers, fluororubber thermoplastic elastomers, polyetheresters, polyurethanes, polycarbonates, polyarylate , Ethylenetetrafluoroethylene, polyvinylidenefluora And a fluorine-based resin such as de, and the like, but not particularly limited thereto.

  However, the monofilament 6 for an optical fiber communication cable member of the present invention needs to have a flat cross section, and the flat shape has a major axis W of 0.2 to 5 mm and a minor axis H of 0.1 to 0. It must be in the range of 5 mm.

  That is, when the major axis W of the cross-sectional shape of the monofilament 6 for optical fiber communication cable member is below the above range, the major axis W (width) is not sufficient, and when this monofilament for optical fiber communication cable member is used for an optical fiber communication cable. This is not preferable because the optical fiber 2 cannot be sufficiently protected and is liable to be damaged by the oviposition of the bearfish. On the contrary, when the major axis W exceeds the above range, the major axis W (width) is large, so that the optical core 2 can be sufficiently protected, but it becomes difficult to bend in the major axis W (width) direction. When the monofilament for a communication cable member is used for an optical fiber communication cable, it is not preferable because the optical fiber communication cable lacks flexibility.

  Moreover, when the short diameter H of the cross-sectional shape of the monofilament 6 for optical fiber communication cable members is below the above range, the strength and the short diameter H (thickness) are not sufficient, and the monofilament for optical fiber communication cable members is used for the optical fiber communication cable. In this case, it is not preferable because not only the optical fiber communication cable is easily broken, but also the egg-laying tube such as a bear swallow easily reaches the optical fiber 2 and the optical fiber 2 is easily damaged. On the other hand, when the minor axis H exceeds the above range, the minor axis H becomes thick, so that the egg-laying tube such as a burdock is less likely to reach the optical core 2, but with respect to the minor axis H (thickness) direction. When the monofilament for an optical fiber communication cable member is used for an optical fiber communication cable, the optical fiber communication cable lacks flexibility, which is not preferable.

  Therefore, if the major axis W and the minor axis H of the cross-sectional shape of the monofilament 6 for an optical fiber communication cable member satisfy the above range, the dimensions can be appropriately selected according to the use status of the optical fiber communication cable 1. In order to exhibit further excellent effects, it is more preferable that the major axis W is in the range of 0.5 to 3.6 mm and the minor axis H is in the range of 0.15 to 0.3 mm.

  The cross-sectional shape of the monofilament 6 for an optical fiber communication cable member is not particularly limited as long as it is a flat shape that satisfies the dimensional conditions of the major axis W and the minor axis H. For example, FIGS. ) In addition to the rectangle (a), octagon (b), and rhombus (c), shapes such as an ellipse (d), track type (e), and saddle type (f) can be cited. It can be used by appropriately selecting from these according to the usage situation of 1.

In addition, the Young's modulus measured according to JIS L1013 8.10 of the monofilament 6 for optical fiber communication cable member needs to be in the range of 1000 to 12000 N / mm ² , and further in the range of 2000 to 8000 N / mm ² . More preferably.

  If the Young's modulus is less than the above range, it becomes a monofilament for an optical fiber communication cable member that lacks strength, and when this monofilament for an optical fiber communication cable member is used for an optical fiber communication cable, it tends to break within the optical fiber communication cable. It is not preferable. Conversely, when the Young's modulus exceeds the above range, it becomes a monofilament for an optical fiber communication cable member that lacks flexibility, and when this monofilament for an optical fiber communication cable member is used for an optical fiber communication cable, it lacks flexibility. Since it becomes an optical fiber communication cable, it is not preferable.

  Under the above conditions, the monofilament 6 for the optical fiber communication cable member of the present invention is formed on the inner surface and / or the outer surface of the optical fiber communication cable 1 in which the optical fiber 2 and the tension member 3 are covered with the sheath 4. When arranged so as to surround at least a part, it is possible to prevent damage to the optical fiber 2 due to spawning of pests such as bear swallows inside the optical fiber communication cable 1 and to stretch the optical fiber communication cable 1. When installing and connecting, the optical fiber communication cable is easy to handle because it has the same flexibility as the conventional optical fiber communication cable.

  Further, as shown in FIG. 1, the monofilament 6 for an optical fiber communication cable member of the present invention can be disposed at various positions other than being disposed between the optical core 2 and the notch 5, for example, As shown in FIGS. 3A to 3F, the optical fiber cable 1 may be disposed so as to surround at least a part of the optical fiber 2 on the inside and / or the outer surface of the optical fiber communication cable 1.

  In the monofilament 6 for an optical fiber communication cable member of the present invention, the optical fiber 2 and the tension member 3 are covered with a sheath 4 inside and / or outside the optical fiber communication cable 1 by satisfying the following conditions. A further excellent effect can be obtained when the optical fiber 2 is disposed so as to surround at least a part of the optical fiber 2 on the surface.

  That is, the tensile strength of the monofilament 6 for optical fiber communication cable member measured in accordance with JIS L1013 8.5 is in the range of 50 to 150 N, more preferably 70 to 130 N, and in accordance with JIS L1013.8 18.2. The measured dry heat shrinkage at 140 ° C. is preferably in the range of 0.3 to 3.0%, more preferably 0.5 to 2.0%.

  If the tensile strength is below the above range, it tends to be a monofilament for an optical fiber communication cable member lacking in strength. When this monofilament for an optical fiber communication cable member is used for an optical fiber communication cable, it breaks in the optical fiber communication cable. May occur.

  On the contrary, when the tensile strength exceeds the above range, it tends to be a monofilament for an optical fiber communication cable member lacking in flexibility. When this monofilament for an optical fiber communication cable member is used for an optical fiber communication cable, it is flexible. It may become an optical fiber communication cable lacking in nature.

  Moreover, when the dry heat shrinkage rate at 140 ° C. is lower than the above range, it tends to be a monofilament for an optical fiber communication cable member that lacks absorbability of tensile impact, and this monofilament for an optical fiber communication cable member is used for an optical fiber communication cable. In such a case, it may not be able to withstand the tensile impact at the time of tensioning and may break in the optical fiber communication cable.

  Conversely, when the dry heat shrinkage rate at 140 ° C. exceeds the above range, it tends to be a monofilament for optical fiber communication cable members that easily contracts against heat, and this monofilament for optical fiber communication cable members is used for optical fiber communication cables. In this case, when processing the optical fiber communication cable by melt-coating the sheath, there may be a problem that the monofilament for the optical fiber communication cable member meanders in the optical fiber communication cable.

  Furthermore, the constituent material of the monofilament 6 for the optical fiber communication cable member of the present invention is preferably a material that has sufficient hardness and is difficult to be pierced by the egg-laying tube, such as a bear swallow, so that polyester resins, especially PET, PBT Alternatively, use of a mixture thereof, use of PPS, polyamide-based resin, and particularly use of at least one selected from 6 nylon, 66 nylon, and 610 nylon are more preferable.

  The polyester resin used in the present invention can contain other dicarboxylic acid components and diol components as long as the object of the present invention is not impaired. For example, as the dicarboxylic acid component, terephthalic acid can be used. , Isophthalic acid, phthalic acid, diphenyl dicarboxylic acid, diphenyl ether dicarboxylic acid, diphenyl sulfone dicarboxylic acid, benzophenone dicarboxylic acid, phenylindane dicarboxylic acid, oxalic acid, succinic acid, adipic acid, sebacic acid, cyclohexane dicarboxylic acid and decalin dicarboxylic acid The diol component includes ethylene glycol, propylene glycol, tetramethylene glycol, pentamethylene glycol, hexamethylene glycol, octamethylene glycol, decamethylene glycol, neope Aliphatic glycols such as tylene glycol, cyclohexanediol, cyclohexanedimethanol, o-xylylene glycol, p-xylylene glycol, m-xylylene glycol, 1,4-bis (2-hydroxyethoxy) benzene, 1,4- Bis (2-hydroxyethoxyethoxy) benzene, 4,4′-bis (2-hydroxyethoxy) biphenyl, 4,4′-bis (2-hydroxyethoxyethoxy) biphenyl, 2,2-bis [4- (2- Hydroxyethoxy) phenyl] propane, 2,2-bis [4- (2-hydroxyethoxyethoxy) phenyl] propane, 1,3-bis (2-hydroxyethoxy) benzene, 1,3-bis (2-hydroxyethoxyethoxy) ) Benzene, 1,2-bis (2-hydroxyethoxy) Aromatics such as benzene, 1,2-bis (2-hydroxyethoxyethoxy) benzene, 4,4′-bis (2-hydroxyethoxy) diphenylsulfone, 4,4′-bis (2-hydroxyethoxyethoxy) diphenylsulfone Diphenols such as glycol and hydroquinone, 2,2-bis (4-hydroxyphenyl) propane, resorcin, catechol, dihydroxynaphthalene, dihydroxybiphenyl, dihydroxydiphenylsulfone, and the like are selected. It can also be used as appropriate.

  Furthermore, the monofilament 6 for an optical fiber communication cable member of the present invention includes titanium oxide, silicon oxide, calcium carbonate, magnesium carbonate, barium carbonate, barium sulfate, calcium sulfate, phosphoric acid as long as the object of the present invention is not impaired. Inorganic particles such as barium, lithium phosphate, calcium phosphate, magnesium phosphate, aluminum oxide, zirconia oxide, lithium fluoride, kaolin, talc, etc., heat resistance, weather resistance, light resistance, hydrolysis resistance, UV protection, antioxidant Additives such as antistatic agents, smoothing agents, waxes, silicone oils, surfactants, dyes and pigments can be optionally contained as required.

  Next, the manufacturing method of the monofilament 6 for optical fiber communication cable members of this invention is demonstrated.

  About the manufacturing method of the monofilament 6 for optical fiber communication cable members, using a known melt spinning method, for example, a melt pressure type or an extruder type melt spinning machine, cooling solidification, heating stretching, heating relaxation treatment, etc. Can do.

  Specifically, for example, a synthetic resin as a raw material is supplied to an extruder melt spinning machine, melted and kneaded at a temperature equal to or higher than the melting point of the synthetic resin, and then a synthetic resin melt is extruded from a spinneret for flat cross-sectional yarn. .

  Then, the extruded synthetic resin melt is cooled and solidified using a medium inert to the synthetic resin such as water, and continuously stretched in one or more stages without being wound, A heat relaxation treatment is performed as necessary.

  In particular, in order for the monofilament 6 for an optical fiber communication cable member to have a Young's modulus, which is a necessary condition of the present invention, it is necessary to perform stretching under an appropriate stretching ratio condition. Although different, for example, when PET resin or PBT resin is used as the raw material, the draw ratio is 2.5 to 6.5 times, and when PPS resin is used as the raw material, the draw ratio is 3.0 to 6 In the case of using a polyamide resin as a raw material for 0.0 times, it is necessary to make the draw ratio 2.5 to 5.0 times.

  And the obtained monofilament 6 for optical fiber communication cable members is an aspect as shown, for example in FIG. 3 (a)-(f), in order to prevent damage to the optical core 2 received by spawning of insect pests, such as a peanut, etc. In the optical fiber communication cable 1.

  In addition, about the manufacturing method of the optical fiber communication cable 1 of this invention, it is not necessary to manufacture by a special method, and it can manufacture by a well-known method, About arrangement | positioning of the monofilament 6 for optical fiber communication cable members, it is said above. As described above, the optical fiber 2 and the tension member 3 may be disposed so that at least a part of the optical fiber 2 is surrounded on the inside and / or the outer surface of the optical fiber communication cable 1 covered with the sheath 4.

  The optical fiber communication cable 1 thus obtained can prevent damage to the optical fiber 2 due to the occurrence of insects such as bear swallows laying inside the optical fiber communication cable 1, and the optical fiber communication cable 1 can be stretched and connected. In this case, since it has the same flexibility as a conventional optical fiber communication cable, it is easy to handle.

  Hereinafter, the monofilament for an optical fiber communication cable member and the optical fiber communication cable of the present invention will be described in more detail with reference to examples.

  In addition, the monofilament for optical fiber communication cable members and the optical fiber communication cable of the present invention are not limited to the following examples as long as the gist thereof is not exceeded.

  Moreover, the evaluation method of the monofilament for optical fiber communication cable members in an Example and an optical fiber communication cable is performed with the following method.

[Young's modulus]
It measured according to JIS L1013 8.10.

[Tensile strength]
It measured according to 8.5 of JIS L1013.

[Dry heat shrinkage at 140 ° C.]
It measured according to 8.18.2 of JIS L1013.

[Long diameter and short diameter of monofilament]
The obtained monofilament for optical fiber communication cable member was cut into a thickness of 15 μm with a microtome, and the major axis W and minor axis H of the section of the section were measured using a digital HD microscope VH-7000 manufactured by KEYENCE Corporation. did.

[Practicality evaluation]
The obtained monofilament for an optical fiber communication cable member was arranged as shown in FIG. 1 to prepare an optical fiber communication cable, and its practicality was evaluated with the following contents. The optical fiber of the optical fiber communication cable has a diameter of 0.3 mm, the tension member uses a polyester resin monofilament with a diameter of 0.6 mm, and the sheath uses a polyethylene resin (Unitika 9739). The size of the optical fiber communication cable was 2.0 mm × 3.0 mm.

A. Degree of damage caused by kumazemi During the three months from July to September, an optical fiber communication cable was stretched 10m between the outdoor utility poles, and the damage caused by kumazemi was investigated and evaluated as follows.
◎ ・ ・ ・ No damage caused by spawning of the bearfish was found in the optical fiber at all, it was very good,
○ ... There were 1-2 damages due to spawning of the bearfish, but there were no practical problems.
× ... Damage caused by spawning of the bearfish was seen all over the optical core, and it was in an unusable state.

B. Ease of handling The ease of handling of optical fiber communication cables in actual installation work was evaluated as follows.
◎ ・ ・ ・ Has the same flexibility as a conventional optical fiber communication cable and easy to handle.
○: Although it was slightly less flexible than the conventional optical fiber communication cable, it was easy to handle.
X: Insufficient flexibility and difficult to handle.

C. Strength and workability The durability of monofilaments for optical fiber communication cable members during stretching and the processability of optical fiber communication cables were evaluated as follows.
1 ... There was no breakage or meandering of the monofilament for the optical fiber communication cable member, and it was very good.
2 ... At the time of tensioning, the monofilament for optical fiber communication cable member was broken,
3 ... During processing, meandering occurred in the monofilament for the optical fiber communication cable member.

[Examples 1 to 4]
A material obtained by solid phase polymerization of PET resin (T250M manufactured by Toray Industries, Inc.) was used as a raw material. The solid phase polymerized PET resin is supplied to an extruder type melt spinning machine having a diameter of 40 mm, melt kneaded at a temperature of 290 ° C., and then a spinneret having a rectangular cross section having a short diameter and a long diameter as shown in Table 1. The melt of PET resin was melt extruded and immediately introduced into a cooling bath to be cooled and solidified.

  Thereafter, the cooled and solidified unstretched yarn is subjected to primary stretching 3.0 times in a hot water bath at 90 ° C., and then subjected to secondary stretching 1.4 times in a dry hot air bath at 180 ° C., Further, a monofilament for an optical fiber communication cable member was obtained by performing a relaxation heat treatment of 0.85 times in a dry hot air bath at 250 ° C.

[Example 5]
A monofilament for an optical fiber communication cable member was obtained under the same conditions as in Example 1 except that the draw ratio condition was changed so that the Young's modulus shown in Table 1 was obtained.

[Example 6]
What dried PBT resin (Toray Industries, Inc. 1200S) was used for the raw material. This dried PET resin is supplied to an extruder type melt spinning machine with a diameter of 40 mm, melted and kneaded at a temperature of 270 ° C., and then a PBT is formed from a spinneret having a rectangular cross section having a minor axis and a major axis as shown in Table 1. The resin melt was melt extruded and immediately introduced into a cooling bath to cool and solidify.

  Thereafter, the cooled and solidified unstretched yarn is subjected to primary stretching 3.8 times in a hot water bath at 60 ° C., and then subjected to secondary stretching 1.2 times in a dry hot air bath at 140 ° C., Further, a monofilament for an optical fiber communication cable member was obtained by performing a relaxation heat treatment 0.87 times in a dry hot air bath at 180 ° C.

[Example 7]
What dried PPS resin (E2080 by Toray Industries, Inc.) was used for the raw material. This dried PPS resin is supplied to an extruder type melt spinning machine having a diameter of 40 mm, melted and kneaded at a temperature of 310 ° C., and then fed from a spinneret having a rectangular cross section having a short diameter and a long diameter as shown in Table 1 from a spinneret. The resin melt was melt extruded and immediately introduced into a cooling bath to cool and solidify.

  Thereafter, the cooled and solidified unstretched yarn is subjected to primary stretching 3.8 times in a saturated steam bath, then subjected to secondary stretching 1.1 times in a 160 ° C. dry hot air bath, and further 140 A monofilament for an optical fiber communication cable member was obtained by performing a relaxation heat treatment of 1.0 times in a dry hot air bath at 0 ° C.

[Example 8]
6 nylon resin (M1021T manufactured by Toray Industries, Inc., hereinafter referred to as N6) was used as a raw material. This N6 resin is supplied to an extruder type melt spinning machine with a diameter of 40 mm, melt-kneaded at a temperature of 260 ° C., and then melted from a spinneret having a rectangular cross section having a short diameter and a long diameter as shown in Table 1. The product was melt extruded and immediately led into a cooling bath to cool and solidify.

  Thereafter, the cooled and solidified unstretched yarn is subjected to primary stretching 3.4 times in a hot water bath at 90 ° C., and then secondary stretched 1.6 times in a 120 ° C. dry hot air bath, Furthermore, a monofilament for an optical fiber communication cable member was obtained by performing a relaxation heat treatment 0.8 times in a 220 ° C. dry hot air bath.

[Example 9]
Monofilaments for optical fiber communication cable members were obtained under the same conditions as in Example 8, except that the dimensions of the long diameter W and the short diameter H and the Young's modulus were changed as shown in Table 1 and the draw ratio conditions and the spinneret were changed.

[Example 10]
66N nylon resin (M3001C manufactured by Toray Industries, Inc., hereinafter referred to as N66) was used as a raw material. This N66 resin is supplied to an extruder type melt spinning machine having a diameter of 40 mm, melted and kneaded at a temperature of 290 ° C., and then melted from a spinneret having a rectangular cross section having a short diameter and a long diameter as shown in Table 1. The product was melt extruded and immediately led into a cooling bath to cool and solidify.

  Thereafter, the cooled and solidified unstretched yarn is subjected to primary stretching 3.0 times in a hot water bath at 90 ° C., and then subjected to secondary stretching 1.2 times in a dry hot air bath at 140 ° C., Furthermore, the monofilament for optical fiber communication cable members was obtained by performing the relaxation heat treatment 0.9 times in a 240 degreeC dry hot air bath.

[Example 11]
A 610N nylon resin (M2001 manufactured by Toray Industries, Inc., hereinafter referred to as N610) was used as a raw material. This N610 resin is supplied to an extruder type melt spinning machine with a diameter of 40 mm, melted and kneaded at a temperature of 270 ° C., and then melted from a spinneret having a rectangular cross section having a short diameter and a long diameter as shown in Table 1 The product was melt extruded and immediately led into a cooling bath to cool and solidify.

  Thereafter, the cooled and solidified unstretched yarn is subjected to primary stretching 3.0 times in a hot water bath at 90 ° C., and then subjected to secondary stretching 1.5 times in a dry hot air bath at 120 ° C., Furthermore, a monofilament for an optical fiber communication cable member was obtained by performing a relaxation heat treatment of 0.9 times in a dry hot air bath at 200 ° C.

[Comparative Examples 1-3]
A monofilament for an optical fiber communication cable member was obtained under the same conditions as in Example 1 except that the dimensions of the long diameter W and the short diameter H and the Young's modulus were changed as shown in Table 1.

  An optical fiber communication cable was prepared using the monofilaments for optical fiber communication cable members obtained in the examples and comparative examples.

  The physical properties of monofilaments for optical fiber communication cable members and the evaluation results of optical fiber communication cables are also shown in Table 1.

  As is clear from the results in Table 1, the optical fiber communication cable (Examples 1 to 11) using the monofilament for the optical fiber communication cable member that satisfies the conditions of the present invention is such that pests such as peanuts lay eggs inside the optical fiber communication cable. In addition to preventing damage to the optical fiber due to the optical fiber communication cable, it should be easy to handle because it has the same flexibility as a conventional optical fiber communication cable when connecting or connecting an optical fiber communication cable. Therefore, it can be seen that its practicality is extremely high.

  On the other hand, the optical fiber communication cable using the monofilament for the optical fiber communication cable member that does not satisfy the conditions of the present invention (Comparative Examples 1 to 3) cannot satisfy all of these effects. An optical fiber communication cable (Comparative Example 1) using a small monofilament for an optical fiber communication cable member is susceptible to damage caused by spawning of the bearfish, an optical fiber using a monofilament for an optical fiber communication cable member having a large major axis W and a small minor axis H The communication cable (Comparative Example 2) is not only susceptible to damage caused by spawning of the blackfish, but is also difficult to handle due to lack of flexibility, and further uses a monofilament for optical fiber communication cable members with a high Young's modulus. Cable (Comparative example ) Is less flexible than the optical fiber communication cable of Comparative Example 2 and difficult to handle, and when processing into an optical fiber communication cable, the monofilament for the optical fiber communication cable member meanders. It was hard to do.

  As described above, the monofilament for an optical fiber communication cable member of the present invention is a monofilament having a flat cross-sectional shape and sufficient strength and flexibility. When the tension member is arranged so as to surround at least a part of the optical fiber on the inside and / or the outer surface of the optical fiber communication cable covered with the sheath, a pest such as a bear swallow lays eggs inside the optical fiber communication cable. The optical fiber cable can prevent damage to the optical fiber due to the cable, and has the same flexibility as the conventional fiber optic cable when connecting and connecting the fiber optic cable. Is obtained.

It is sectional drawing which shows an example of the optical fiber communication cable of this invention. (A)-(f) is sectional drawing of the monofilament for optical fiber communication cable members of this invention. (A)-(f) is sectional drawing of the optical fiber communication cable which showed arrangement | positioning of the monofilament for optical fiber communication cable members. It is sectional drawing which shows an example of the conventional optical fiber communication cable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber communication cable 2 Optical fiber 3 Tension member 4 Sheath 5 Notch 6 Monofilament for optical fiber communication cable member W Long diameter of monofilament for optical fiber communication cable member H Monofilament short diameter for optical fiber communication cable member

Claims (8)

A monofilament made of a synthetic resin having a cross section of a flat shape having a major axis of 0.2 to 5 mm and a minor axis of 0.1 to 0.5 mm, and a Young's modulus measured according to JIS L1013 of 8.10 is 1,000 to 1,000. It is in the range of 12000 N / mm ² , and the optical fiber and the tension member are arranged so as to surround at least a part of the optical fiber on the inner and / or outer surface of the optical fiber communication cable covered with the sheath. Monofilament for optical fiber communication cable members. The tensile strength measured according to JIS L1013 8.5 is 50 to 150 N, and the dry heat shrinkage at 140 ° C. measured according to JIS L1013 8.18.2 is in the range of 0.3 to 3.0%. The monofilament for an optical fiber communication cable member according to claim 1, wherein the monofilament is provided. The monofilament for an optical fiber communication cable member according to claim 1 or 2, wherein the synthetic resin is a polyester resin. The monofilament for an optical fiber communication cable member according to claim 3, wherein the polyester resin is polyethylene terephthalate and / or polybutylene terephthalate. The monofilament for an optical fiber communication cable member according to claim 1 or 2, wherein the synthetic resin is polyphenylene sulfide. The monofilament for an optical fiber communication cable member according to claim 1 or 2, wherein the synthetic resin is a polyamide-based resin. The monofilament for an optical fiber communication cable member according to claim 6, wherein the polyamide-based resin is at least one selected from 6 nylon, 66 nylon, and 610 nylon. The monofilament for an optical fiber communication cable member according to any one of claims 1 to 7, wherein the monofilament for an optical fiber communication cable member is at least of the optical core wire on an inner surface and / or an outer surface of the optical fiber communication cable in which the optical core wire and the tension member are covered with a sheath. An optical fiber communication cable characterized by being arranged so as to surround a part.

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