JPS5811908A - Nonmetallic optical cable unit - Google Patents

Abstract

PURPOSE:To form a strong unit against the external force by providing the unit with a nonmetallic optical cable unit core coated with a nonmetallic protecting layer and a highly expansible preplating hardened layer mixed with woven fabrics which is applied to the external periphery of the unit core. CONSTITUTION:A nonmetallic optical cable unit 1 is provided with an optical fiber core group 4 formed by twisting plural optical fiber cores around the external surface of a nonmetallic central interposing member 2, a nonmetallic optical cable unit core 9 formed by covering the external surface of the core group 4 with a nonmetallic protecting layer 8 such as craped paper and a prepreg tape hardened layer 10 formed by coating the external periphery of the core 9 longitudinally with a prepreg tape and heating them to harden. For example, a plastic wire reinforced with glass fiber is permitted to be used for the nonmetallic central interposing member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-metallic optical cable unit.

Non-metallic optical cable units do not use metal, so configuring a cable with them has the advantage of preventing lightning strikes, electromagnetic induction interference, etc.

FIG. 1 shows an example of a conventional non-metallic optical cable unit 1. As shown in FIG. This unit 1-1 consists of twisting a plurality of optical fiber core wires (the outer periphery of the optical fiber [provided with a circulation protection coating such as 7' rustic) 3 around the outer periphery of a non-metallic center intervening 2 such as a glass fiber reinforced plastic wire. It has a structure in which a non-metal protective layer 5 such as polypropylene yarn is placed on the outer periphery of the combined optical fiber core #il#4, and a pressing winding 6 such as Mylar tape is provided on the outer periphery. There are two types of unit 1: one is not filled with Noelly, and the other is filled.

FIG. 2 shows two other examples of the conventional non-metallic optical unit 1. This non-metal optical cable unit 1
This has a structure in which a non-metal protective layer 5 is placed on the outer periphery of the optical fiber core group 4, and a plastic sheath 7 is placed on the outer periphery of the VC holding winding 6.

However, in a non-metallic optical cable unit having such a structure, there is only a soft protective layer 5 and a plastic sheath 7 around the outer periphery of the optical fiber group 4, so it is not susceptible to external forces (crushing There is a drawback that the effect of preventing the occurrence of physical damage (such as rubbing, etc.) is extremely small.

An object of the present invention is to provide a non-metallic optical cable unit that is strong against external forces.

The non-metallic optical cable unit of the present invention has a structure in which a hardened layer of high-tensile-strength fiber-containing Nori Preg tape is provided on the outer periphery of the non-metallic optical cable unit core, which has a non-metallic protective layer on the outer periphery of the optical fiber core group.

In addition, other non-metal optical cable units of the present invention include:
A non-metal optical cable core with a non-metal protective layer on the outer periphery of the optical fiber group is equipped with a Noripreg tape hardening layer containing high tensile strength fibers, a plastic sheath is provided around the outer periphery of this Noripreg tape hardening layer, and the Noripreg tape is hardened. The layer and plastic sheath are glued together to form an integrated structure. This unit can also be used as an optical fiber cable.

Noripreg used in the present invention
) Tape is a semi-cured, non-adhesive surface woven fabric of high tensile strength fibers such as glass fiber or aromatic 71 hyliamide fiber (trade name: Kevlar).
It is a tape-shaped laminate molded product impregnated with epoxy-based or polyester-based resin, and is cured by heating.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 3 shows a non-metallic optical cable unit 1 according to the present invention.
This is a first embodiment of the invention.

The non-metal optical cable unit 1 of this embodiment is made by twisting together a plurality of optical fiber core wires (optical fibers with a protective coating such as plastic on the outer periphery) 3 around the outer periphery of a non-metal center interposer 2. Group 4 is formed, and a non-metallic protective layer 8 such as crepe paper is torn on its outer periphery to form a non-metallic optical cable unit core 9, and its outer periphery vc
It has a structure in which a cured prepreg tape layer 10 is formed by vertically coating F-Resoreg Teso and curing it by heating. Note that the vertical splicing of the Noripreg tape may be performed by either butt forming, in which the ends of the Noripreg tape are butted against each other, or overlapping forming, in which the ends are overlapped. As the non-metallic center interposer 2, for example, a glass fiber reinforced plastic wire, a glass fiber reinforced plastic wire having a plastic coating layer on its outer periphery, a wire made of polyamide fibers whose outer periphery is covered with a plastic layer, a plastic string, etc. can be used.

Since such a non-metallic optical cable unit 1 has a hardened glue preg tape layer 10 on the outer periphery of the non-metallic optical cable unit core 9, the core 9 can be protected from external forces. In addition, when the Noripreg tape is heated and cured, since there is a protective layer 8 on the inside of the tape, this protective layer 8 acts as a heat insulating layer to protect the optical fiber core group 4.
Keep it away from heat and keep it warm. Furthermore, when an impact force or the like is applied to the prepreg tape cured layer 10, the impact force is dispersed by the hard prepreg tape cured layer 10, and a part of it becomes (
5) The impact force is about to be transmitted to the optical fiber group 4 side, but the protective layer 8 in the coating acts as a buffer layer and absorbs the impact force.
The optical fiber core group 4 is protected from impact force.

Figure 4 shows a non-metallic optical cable unit 1 according to the present invention.
This shows a second embodiment of the invention. The non-metallic optical cable unit 1 of this embodiment has a sherry-containing non-metal protective layer 8' made of crepe paper or the like impregnated with sherry on the outer periphery of a sherry-containing optical fiber core group 4' whose gaps are filled with sherry 11. A shell-containing non-metallic optical cable unit core 9' is formed, and a pre-preg tape cured layer 10 is provided on the outer periphery of the core 9', which is coated vertically with Nori-preg tape and cured by heating.

With this structure, in addition to the effects of the first embodiment,
Excellent waterproofing effect can be obtained and the life of the unit can be extended.

FIG. 5 shows a non-metallic optical cable unit 1 according to the present invention.
This shows a third embodiment of the invention. The non-metallic optical cable unit 1 of this embodiment has a first non-metallic protective layer 12 provided by covering the outer periphery of the optical core (6) and IPA core wire group 4 with polypropylene yarn, and the outer periphery of the first non-metallic protective layer 12 is coated with crepe paper or the like. A second non-metal protective layer 8 is provided to form a non-metal optical cable unit core 9, and a Noripreg tape hardened layer 10 is provided, which is formed by longitudinally covering the outer periphery of the rc prepreg tape and curing it by heating.

In this way, the optical fiber core group 4 is protected by the double non-metal protective layer 12.8, so the protection performance from heat and mechanical force is further improved compared to the one in FIG. .

FIG. 6 shows a non-metallic optical cable unit 1 according to the present invention.
This shows a fourth embodiment of the invention. The non-metallic optical cable unit 1 of this embodiment has a shelly-containing first non-metal protection made of polypropylene yarn or the like impregnated with shelly on the outer periphery of a shelly-containing optical fiber core group 4' whose gaps are filled with shelly 11. layer 12', and a second shelly-containing non-metallic protective layer 8' made of crepe paper or the like impregnated with sherry adhering to its outer periphery to form a sherry-containing non-metallic optical cable unit core 9'. It has a structure in which a cured layer 10 of glue preg tape is provided by coating the preg tape vertically and curing it by heating.

In this way, in addition to the effects of the third embodiment, an excellent waterproof effect can be obtained.

The non-metallic optical cable unit 1 shown in FIGS. 3 to 6 may be covered with a plastic sheath around the prepreg tape cured layer 10. In that case, it can be used as a non-metallic optical cable unit or as a non-metallic optical cable. Can be used. Further, by twisting a plurality of non-metallic optical cable units 1-1 as shown in FIGS. 3 to 6 and wrapping a plastic sheath around the outer periphery of the cable through a pressing layer, it can be used as a non-metallic optical cable.

FIG. 7 shows an example of a non-metal optical cable 13 using the non-metal optical cable unit 1 of the present invention. This non-metallic optical cable 13 is shown in FIGS. 3 to 6.
Non-metallic optical cable unit 1 as shown in the figure. A plastic sheath 15 is attached to the outer periphery of the strands with a pressing layer 14 interposed therebetween. It has a structure covered with.

Since the non-metallic optical cable 13Fi having such a structure and the non-metallic optical cable unit 1 having the Noripreg tape hardened layer 10 are twisted together, the internal optical fiber core group 4 can be protected by the Noripreg tape hardened layer 10 during twisting. It can be twisted in almost the same way as electric cable units using metal core wires without paying attention to the following.

FIG. 8 shows a non-metallic optical cable unit 1 according to the present invention.
This shows a fifth embodiment of the invention. The non-metallic optical cable unit 1 of this embodiment has a plurality of optical fiber core wires 3 twisted together around the outer periphery of a non-metal center interposer 2 to form an optical fiber core group 4, and a non-metal protective layer 8 such as crepe paper on the outer periphery. A non-metallic optical cable unit core 9 is formed by covering the core (9) with Noripreg tape, and Noripreg tape is coated vertically on its outer periphery and cured by heating to form a Noripreg tape hardening layer 10, and the outer periphery of the Noripreg tape is extruded and covered with Kf Silasuc. It has a structure in which a plastic sheath 7 is provided, and the prepreg tape cured layer 10 and the silastic sheath 7 are bonded and integrated.

The adhesive for bonding the Noripreg tape cured layer 10 and the plastic sheath 7 may include hot melt resins such as ethylene vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene vinyl acetate vinyl alcohol terpolymer, Ethylene glycidyl methacrylate vinyl acetate 3
Original copolymers, ionomer resins, olein-vinyl monomer copolymers, metal salts thereof, and the like can be used. Such an adhesive can be applied to the Noripreg tape cured layer 10.
The plastic sheath 7 is then coated thinly on the surface of the plastic sheath 7, and then the plastic sheath 7 is extruded and coated with heat to heat-seal the two.

Since such a non-metallic optical cable unit 1 has the glue preg tape (10) hardened layer 10 inside the plastic sheath 7, the non-metallic optical cable unit core 9 can be protected from external force.

In addition, since there is a protective layer 8 on the outer periphery of the non-metallic optical cable unit core 9, which has a heat insulating effect, the non-metallic optical cable unit core 9 is protected from the heat generated when the Noripreg tape is cured or the heat generated when the plastic sheath 7 is extruded and coated.
can be protected. Furthermore, this protective layer 8 also has the effect of protecting the non-metallic optical cable unit core 9 from external forces.

In addition, since the Noripreg tape cured layer 10 is a composite of a woven fabric such as glass fiber and a thermosetting resin, its coefficient of linear expansion is approximately the same as that of the non-metallic optical fiber core group 4.
Since the plastic sheath 7 is integrated with this layer 10, it is possible to prevent the plastic sheath 7 from shrinking in the longitudinal and radial directions at low temperatures. This can prevent the phenomenon of increased transmission loss.

FIG. 9 shows a non-metallic optical cable unit 1 according to the present invention.
This shows a sixth embodiment of the invention. The non-metallic optical cable unit 1 of this embodiment has a shelly-containing non-metallic protective film layer 8' made of crepe paper or the like adhered and impregnated with sherry on the outer periphery of a shelly-containing optical fiber core group 4' whose gaps are filled with sherry 11. A non-metal optical cable unit core 9' containing sherry is formed by covering the core 9', and a Noripreg tape hardening layer 10 is provided on the outer periphery of the Noripreg tape, which is coated vertically and cured by heating, and a plastic sheath is formed by extruding and covering the outer periphery of the Noripreg tape. 7, and has a structure in which the Noripreg tape cured layer 10 and the glass sheath 7 are bonded and integrated.

With this structure, in addition to the effects of the fifth embodiment,
Excellent waterproofing effect can be obtained and the life of the unit can be extended.

FIG. 10 shows a seventh embodiment of the non-metallic optical cable unit 1 according to the present invention. In the non-metallic optical cable unit 1 of this embodiment, a first non-metallic protective layer 12 is provided by covering the outer periphery of the optical fiber core group 4 with polynolopyrene yarn or the like, and a second non-metallic protective layer 12 is provided by covering the outer periphery with crepe paper or the like. A non-metallic protective layer 8 is provided to form a non-metallic optical cable unit core 9, and a Noripreg tape hardening layer 10 is provided on the outer periphery of the non-metallic optical cable unit core 9, and a Noripreg tape cured layer 10 is provided on the outer periphery of the non-metallic optical cable unit core 9. A plastic sheath 7 is provided, and the Noripreg tape cured layer 10 and the plastic sheath 7 are bonded and integrated.

In this way, the optical fiber group 4 is protected by the double protective layers 12 and 8, so that the protection performance against heat and mechanical force is further improved compared to that shown in FIG.

FIG. 11 shows an eighth embodiment of the non-metallic optical cable unit 1 according to the present invention. The non-metallic optical cable unit 1 of this embodiment has a shelly-containing first non-metallic protection made of a polynolopyrene yarn or the like impregnated with shelly on the outer periphery of a shelly-containing optical fiber fiber group 4' whose gaps are filled with shelly. ff412', and a second non-metallic protective layer 8' made of crepe paper or the like adhering and impregnated with sherry (13) is placed on its outer periphery to form a non-metallic optical cable unit core 9' containing sherry. A Noripreg tape cured layer 10 is provided by covering the Noripreg tape vertically and hardening it by heating, and a plastic sheath 7 is provided by extruding plastic on the outer periphery of the Noripreg tape hardening layer 10.
It has a structure in which a prepreg tape hardening layer 10 and a plastic sheath 7 are bonded and integrated.

In this way, the waterproof performance is improved compared to that of the seventh embodiment.

The non-metallic optical cable unit 1 shown in FIGS. 8 to 11 can be twisted to form a non-metallic optical cable by twisting them together and covering the outer periphery with a plastic sheath via a pressing layer, and can also be used as a non-metallic optical cable by itself. It can be used as

FIG. 12 shows a ninth embodiment of the non-metallic optical cable unit 1 according to the present invention. In this non-metallic optical cable unit 1, a non-metallic protective layer 8 made of crepe paper or the like is placed over the outer periphery of an optical fiber core group 4 (14) having a non-metallic central interposer 2 at the center to form a non-metallic optical cable unit core 9.
In this example, multiple pieces of this non-metal optical cable unit core 9 are used! /'i 7 strands twisted together, presser wrapped around the outer periphery 16
The unit core twisted body 17 is formed by applying the following steps. The outer periphery K f of this unit core twisted body 17 is longitudinally coated with Rilgutheno and cured by heating to provide the Noripreg tape hardening layer 10, and the outer periphery thereof is coated with glass nac to provide the plastic sheath 7, and the Noripreg tape is cured. It has a structure in which the layer 10 and the plastic sheath 7 are bonded and integrated.

FIG. 13 shows a tenth embodiment of the non-metallic optical cable unit 1 according to the present invention.

This non-metallic optical cable unit 1 is made of crepe fibers impregnated with sherry and adhered to the outer periphery of a group of sherry-containing optical fibers 4' which has a non-metallic central interposition 2 at the center and fills the gaps between the optical fiber cores 3 with sherry 11. A sherry-containing non-metallic protective layer 8' made of paper or the like is covered to form a sherry-containing non-metallic optical cable unit core 9'.
A plurality of strands (7 strands in the example) are twisted together, a transparent shelly presser winding 16' is applied to the outer periphery, and the gap between the unit cores 9' is filled with sherry 11 to form a sherry-containing unit core twisted body 17'. is forming. Noripreg tape is coated vertically on the outer periphery of this sherry-containing unit core twisted body 17' and heated and cured to provide a Noripreg tape cured layer 10, and a plastic sheath 7 is provided by extruding and covering the outer periphery of the Noripreg tape. , has a structure in which a prepreg tape hardening layer 10 and a plastic sheath 7 are bonded and integrated.

In addition, in FIG. 12, it is also possible to further provide a non-metal protective layer by covering the outer periphery of the stranded body of a plurality of non-metal optical cable unit cores 9 with polypropylene yarn or the like. It is also possible to further provide a sherry-containing non-metal retention layer by covering the outer periphery of the twisted structure of a plurality of sherry-containing non-metallic optical cable unit cores 9' in FIG. .

As explained above, the non-metallic optical cable unit according to the present invention is equipped with a Noripreg tape hardened layer on the outer periphery of the non-metallic protective layer of the non-metallic optical cable unit core. etc.). In addition, since the Noripreg tape hardening layer is a composite of a woven fabric of high tensile strength fibers such as glass fiber or aramid fiber and a thermosetting resin, the Noripreg tape hardening layer has a coefficient of linear expansion close to that of optical fiber. However, no contraction force is exerted on the optical fiber core group during the Sakai temperature, and therefore an increase in optical fiber loss 2 can be prevented. Furthermore, according to the unit of the invention:
When multiple strands of this unit are twisted together, the outer periphery of each unit is protected by a hardened layer of prepreg tape, so it is almost the same as twisting units of electric cables using metal core wire without paying close attention. can be twisted together. (17) Furthermore, since Noripreg tape is flexible before curing, it can be easily coated on the unit core. Furthermore, when the Noripreg tape is heat-cured, the protective layer acts as a heat insulating layer to protect the optical fiber core from heat.

Next, since the non-metallic optical cable unit of the present invention having a silastic sheath has a hard presoleg hardened layer inside the plastic sheath, it is possible to protect the non-metallic optical cable core from external forces (such as crushing and straining). In addition, the Noripreg tape hardening layer has a coefficient of linear expansion close to that of the optical fiber, and prevents the plastic sheath that is integrated with it by adhesive from shrinking.
It is possible to prevent the optical fiber core group from being bent due to contraction of the plastic sheath, and it is possible to prevent an increase in transmission loss of the optical fiber core wire due to the bending.

Furthermore, the presence of such a prepreg tape hardening layer can prevent the optical fiber core group from protruding from the plastic sheath. Furthermore, since the Noripreg tape is flexible before curing, it can be easily coated onto the Yu(18) knit core. Furthermore, when the Noripreg tape is heat-cured, the protective layer acts as a heat insulating layer to protect the optical fiber core from heat.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views showing two types of conventional non-metallic optical cable units, and FIGS. 3 to 6 are cross-sectional views of two types of conventional non-metallic optical cable units. Each cross-sectional view of the fourth embodiment, FIG. 7 is a cross-sectional view showing an example of a non-metal optical couple using the non-metal optical cable unit of the present invention, and FIGS. 8 to 13 are cross-sectional views of the non-metal optical cable unit according to the present invention. 5th to 1st
FIG. 2 is a cross-sectional view of Example 0. 1... Non-metal optical cable unit, 2.../7
゛J metal center interposition, 3... Optical fiber core wire, 4...
・Hikaritsunoaiha core wire group, 7...Plastic sheath, 8...
Non-metal protective layer, 8'... Sherry-containing non-metal protective layer, 9... Non-metal optical cable unit core, 9
′... Non-metallic optical cable unit core containing sherry, 10... Noripreg Teso hardening layer, 11... Sherry, 12... Non-metal protective layer, 12'... Non-metallic protection layer containing sherry, 17... Unit Core twisted body, 17'... Sherry-filled unit core twisted body. Continued from page 1 ■Applicant Furukawa Electric Co., Ltd. 2-6-1-33 Marunouchi, Chiyoda-ku, Tokyo

Claims (2)

[Claims] (1) It includes a non-metallic optical cable unit core in which the outer periphery of the optical fiber core group is covered with a non-metallic protective layer, and a ZiprysolegTezo hardened layer containing high tensile strength woven fabric coated on the outer periphery of the core. A non-metallic optical cable unit featuring: (2) A non-metal optical cable core in which the outer periphery of the optical fiber core group is covered with a non-metal protective layer, a prepreg tape hardening layer containing high tensile strength woven fabric coated on the outer periphery of the core, and a prepreg tape hardening layer containing high tensile strength woven fabric coated on the outer periphery of the core, and 1. A non-metallic optical cable unit comprising a coated plastic sheath, wherein the prepreg tape hardening layer and the plastic sheath are bonded and integrated.