JP4927700B2 - Optical fiber cable and method for manufacturing the optical fiber cable - Google Patents

Description

  The present invention relates to an optical fiber cable and a method for manufacturing the optical fiber cable. More specifically, the present invention relates to an optical fiber cable used for drawing a wiring system cable installed in an aerial space into a subscriber's house such as a general house or a building, and a method for manufacturing the optical fiber cable.

In recent years, the construction of an optical subscriber line network using optical fiber cables is rapidly progressing, and an optical fiber cable 9 (shown in cross section in FIG. 9) is used as an optical fiber cable for wiring optical fibers from a utility pole to a house. (Also referred to as an optical fiber drop cable) is applied (for example, see Patent Document 1). In this optical fiber cable 9, tension members 22 are arranged on both sides of the optical fiber core 21 in parallel with the optical fiber core 21 in the longitudinal direction, and the sheath 23 covers the optical fiber core 21 and the tension member 22. And comprising. Further, the optical fiber cable 9 is formed with a notch 24 so that the sheath 23 can be easily torn when the optical fiber core wire 21 is taken out from the cable 9 as necessary.

JP 2005-257752 A

  By the way, in the case of an optical fiber drop cable or an optical fiber indoor cable, the sheath is broken at the end of the cable, and the optical fiber core wire is taken out and terminated by fusion or mechanical splicing. It is necessary to store. In recent years, the minimum bending radius of the optical fiber core wire is about 30 mm to 15 mm, and the termination box for storing the extra length has been downsized.

  On the other hand, when the termination box is downsized, not only is it difficult to store the optical fiber cable in the tray of the termination box, but even when the same length of optical fiber is stored, the turn at the time of rounding increases. I was sorry. In addition, it is difficult for an unfamiliar operator to take a general φ0.25 mm optical fiber core wire with the same diameter as many rounds and store it in a termination box. There was a problem of inefficiency.

  The present invention has been made in view of the above problems, and when the sheath is torn at the end of the cable and the optical fiber core (tape-shaped core) is taken out, the optical fiber core is suitably curled and the working efficiency is improved. An object of the present invention is to provide an optical fiber cable in which the optical fiber quality is improved and a method for manufacturing the optical fiber cable.

In order to solve the above problems, an optical fiber cable according to claim 1 of the present invention includes a tape-shaped core wire in which an optical fiber single core wire and a linear body are integrated, and a sheath covering the tape-shaped core wire. In the optical fiber cable, the optical fiber single-core wire and the linear body are integrated in a state where the optical fiber cable is straightly stretched in the longitudinal direction of the cable.

An optical fiber cable according to a second aspect of the present invention is the optical fiber cable according to the first aspect, wherein the optical fiber cable is released from the stretched state of the optical fiber single core wire and the linear body , the length of the back condition, or, characterized in that less than the actual length of the direction in which the actual length is the length of a state in which heat shrinkage is not stretched.

An optical fiber cable according to a third aspect of the present invention is the optical fiber cable according to the first or second aspect, wherein the actual length of the optical fiber single-core wire and the linear body is 100 as the longer length. In this case, the shorter length is 98.0 to 99.5.

  An optical fiber cable according to a fourth aspect of the present invention is the optical fiber cable according to any one of the first to third aspects, wherein the optical fiber cable is arranged in parallel with the tape-shaped core wire on both sides or one side of the tape-shaped core wire. A tension member is provided.

  An optical fiber cable manufacturing method according to claim 5 of the present invention is the method of manufacturing the optical fiber cable according to claim 1, wherein the linear body is made of a synthetic resin having heat shrinkability. When the tape-shaped core wire is covered with the sheath, the wire is covered with a sheath having a temperature sufficient to cause heat shrinkage of the wire, and the wire is heat-shrinked.

An optical fiber cable manufacturing method according to claim 6 of the present invention is the method for manufacturing the optical fiber cable according to claim 1, wherein the linear body is made of a synthetic resin having heat shrinkability. The cable covered with the sheath is heat-treated at a temperature sufficient for the linear body to thermally contract, and the linear body is thermally contracted.

A manufacturing method of an optical fiber cable according to claim 7 of the present invention is a method of manufacturing the optical fiber cable according to claim 1, wherein the optical fiber single core wire and the linear body are integrated. The tape-shaped core wire and the step of covering the tape-shaped core wire with a sheath are performed in one line, and the tension applied when the tape-shaped core wire and the linear body are fed out is supplied . In other words, the optical fiber single core wire and the linear body are integrated to form the tape-shaped core wire.

In the optical fiber cable manufacturing method according to claim 8 of the present invention, in the above-described claim 7, when the tension applied when being sent out from the supply is 100, the larger tension is applied. The tension is 600 to 1050.

  An optical fiber cable according to claim 1 of the present invention is such that an optical fiber core wire to be disposed is a tape-shaped core wire in which an optical fiber single core wire and a linear body are integrated, and such an optical fiber single core wire and a linear shape. Since either one of the body is integrated in the state of being stretched in the longitudinal direction of the cable, the sheath is opened at the termination or the like and the tape-shaped core (optical fiber core) is taken out from the cable in an open state. At this time, the tape-shaped core wire is curled, and the extra length of the cable can be accommodated in the miniaturized termination box without any problem, so that an optical fiber cable with good working efficiency can be obtained. In addition, when the tape-shaped core wire is taken out from such a cable, if the optical fiber single-core wire and the linear body are separated from the tape-shaped core wire, an uncurled optical fiber single-core wire can be taken out. Even when a cable is terminated, a conventionally used base material for fusion or mechanical splicing, a tool, a jig, or the like can be used as it is, and the optical fiber cable is excellent in cost measures.

  In the optical fiber cable according to claim 2 of the present invention, the optical fiber single core wire and the linear body constituting the tape-shaped core wire are different from each other in the actual length of the optical fiber single core wire and the linear body. Since the actual length of the optical fiber is shorter than the actual length that is not stretched, when the tape-shaped core wire (optical fiber core wire) is taken out from the optical fiber cable, the tape-shaped core wire is preferably curled. It becomes like this.

  In the optical fiber cable according to claim 3 of the present invention, the relationship between the length of the optical fiber single core wire to be a tape-shaped core wire and the length (actual length) of the linear body is in a specific range. When the wire (optical fiber core wire) is taken out, the tape-shaped core wire is surely curled. Further, if the length relationship is within the range, the shorter the shorter length, the smaller the curl diameter when the tape-shaped core wire is taken out, and the longer the curl diameter becomes. Thus, by adjusting the relationship between the length of the optical fiber single fiber and the linear body, it is possible to obtain a desired curl diameter according to the termination box and the like, and handling in the termination box etc. It becomes an easy optical fiber cable.

  In the optical fiber cable according to claim 4 of the present invention, the tension member is arranged in parallel with the tape-shaped core wire in the longitudinal direction on both sides or one side of the tape-shaped core wire as the cable configuration. An optical fiber drop cable having an effect can be suitably provided.

  According to a fifth aspect of the present invention, there is provided a method for producing an optical fiber cable, wherein the optical fiber cable according to the first aspect is manufactured by using a linear body made of a synthetic resin having heat shrinkability. Since the temperature of the sheath is adjusted so that the temperature sufficient to cause thermal contraction of the linear body can be maintained when the core is covered with the sheath, when the sheath is extrusion coated, By heat transfer and heat shrinkage, an optical fiber cable integrated with the linear body stretched in the longitudinal direction can be easily obtained.

  According to a sixth aspect of the present invention, there is provided a method of manufacturing an optical fiber cable according to the first aspect of the present invention, wherein the optical fiber cable according to the first aspect is manufactured using a linear body made of a synthetic resin having heat shrinkability. Since the cable is heat-treated at a temperature sufficient for the linear body to thermally shrink, the linear body is efficiently thermally contracted and pulled. Thus, an optical fiber cable integrated in a stretched state can be easily obtained.

  According to a seventh aspect of the present invention, there is provided a method for manufacturing an optical fiber cable according to the first aspect of the present invention. In manufacturing the optical fiber cable according to the first aspect, a single optical fiber and a linear body are integrated into a tape-shaped core ( When performing the process of manufacturing as an optical fiber core) and the process of extrusion-coating the sheath on the tape-shaped core and the tension member in one line (one process), two optical fiber cores and a linear body The supply tension of the wire is adjusted so that one of the optical fiber single-core wire and the linear member has a higher tension than the other. As a result, the wire with the higher tension is pulled in the longitudinal direction than the wire with the lower tension, and in the stretched state, the tape-shaped core (optical fiber core) becomes an optical fiber cable. It is possible to easily obtain an optical fiber cable that is integrated in a state in which either one of the single core wire and the linear body is stretched in the longitudinal direction.

  The optical fiber cable manufacturing method according to claim 8 of the present invention has a small relationship between the supply tension of the optical fiber single core wire and the linear body when the optical fiber cable manufacturing method according to claim 7 is carried out. When the tension on the other side is set to 100, the larger tension is set within a specific range, so that either the optical fiber single core wire or the linear body is integrated in a state where it is pulled in the longitudinal direction. Thus, an optical fiber cable having the tape-shaped core wire that has been used can be obtained efficiently and reliably.

  Hereinafter, an aspect of the optical fiber cable of the present invention will be described. FIG. 1 is a sectional view showing an embodiment of the configuration of an optical fiber cable according to the present invention. The optical fiber cable 1 of the present invention includes a tape-shaped core wire 21 (optical fiber core wire 21) in which an optical fiber single core wire 211 and a linear body 212 are integrated, and a sheath 23 that covers the tape-shaped core wire 21. Are provided as a basic configuration. In FIG. 1, tension members 22 are arranged on both sides of the tape-shaped core wire 21 in parallel with the optical fiber core wire 21 in the longitudinal direction, and notches 24 are provided on both sides of the optical fiber cable 1. The aspect which formed was shown. The optical fiber cable 1 of the present invention, which is also called an optical fiber drop cable or an optical fiber indoor cable, tears the sheath 23 at the end, takes out the optical fiber core wire 21 and terminates it by fusion or mechanical splicing. It is necessary to store the extra length of the cable 1 in the end box.

  The tape-shaped core wire 21 (optical fiber core wire 21) disposed in the optical fiber cable 1 of the present invention is formed by integrating an optical fiber single core wire 211 and a linear body 212, and in the present invention, The optical fiber single core wire 211 and the linear body 212 are integrated with each other in a state of being stretched in the longitudinal direction.

  FIG. 2 is a schematic diagram showing the configuration of the cable terminal in the optical fiber cable 1 of FIG. 2, the actual length (released from the stretched state) of the optical fiber single core wire 211 and the linear body 212 constituting the tape-shaped core wire 21 (optical fiber core wire 21) is returned to the original state. A state in which the linear body 212 whose length in the state of being heated or in the state of being thermally contracted is shorter than the actual length of the optical fiber single core wire 211 is stretched in the longitudinal direction of the cable 1 (the arrow direction in FIG. 2) This will be described using the example. In the optical fiber cable 1 shown in FIG. 2, the linear body 212 is pulled and stretched from the actual length of the linear body 212, so that a force to contract the linear body 212 itself is applied. However, it is held and fixed to the sheath 23 to be covered together with the optical fiber single core wire 211. Therefore, the linear body 212 is pulled in the longitudinal direction of the cable 1 and maintains the stretched state. As shown in FIG. 2, the lengths of the optical fiber single core wire 211 and the linear body 212 are as follows. In addition, even in the entire length of the cable 1, the apparent lengths of the optical fiber single core wire 211 and the linear body 212 are equal. In addition, the optical fiber single core wire 211 integrated with the linear body 212 is compressed in the longitudinal direction from the reaction in which the linear body 212 is stretched, and is in a contracted state to maintain a balance. Yes.

  On the other hand, when the cable core 1 is covered with a tape-shaped core wire 21 (optical fiber core wire 21), the sheath 23 to be gripped and fixed is torn and the tape-shaped core wire 21 is taken out from the optical fiber cable 1, the tape-shaped core wire is removed. It will be in the state (open state) where the tension state of line 21 was eased. In such an open state, the linear body 212 that has been stretched by being pulled in the longitudinal direction contracts, so that the tape-shaped core 21 including the optical fiber single core 211 integrated with the linear 212 is curled. Will do. FIG. 3 is a schematic view showing a state where the tape-shaped core wire 21 is curled in the optical fiber cable 1 of FIG. As described above, one of the optical fiber single-core wire 211 and the linear body 212 is integrated in a state where the optical fiber single-core wire 211 and the linear body 212 are stretched in the longitudinal direction (here, the linear body 212). When the tape-shaped core wire 21 is taken out from 1, the tape-shaped core wire 21 is curled, and the extra length of the cable can be stored without any problem in the miniaturized termination box, so that the work efficiency is improved. A good optical fiber cable 1 is obtained.

  4 is a schematic view showing a state in which the optical fiber single-core wire 211 and the linear body 212 are separated from each other in the optical fiber cable of FIG. 2, and FIG. 5 is a schematic diagram of the optical fiber cable of FIG. It is the schematic which showed the state which took out 211. FIG. In general, when the optical fiber cable 1 such as an optical fiber drop cable terminates the optical fiber single core wire 211, as shown in FIG. After separating the core wire 211 and the linear body 212, as shown in FIG. 5, it is necessary to take out the optical fiber single core wire 211 while removing the unnecessary linear body 212. When the optical fiber core 21 is taken out from the optical fiber cable 1 of the present invention, the tape-shaped core 21 is curled as shown in FIG. 3, but the optical fiber single core 211 and the linear body 212 are curled. When the optical fiber is separated, the optical fiber single-core wire 211 comes out in a straight line, and conventionally used base materials, tools, jigs, etc. for fusion or mechanical splicing can be used as they are.

  Note that, as in the optical fiber cable 1 of the present invention, when one of the optical fiber single core wire 211 and the linear body 212 is pulled in the longitudinal direction and is integrated in the stretched state. In the state where the sheath 23 is torn and the tape-shaped core wire 21 is opened, the tape-shaped core wire 21 is taken out from the optical fiber cable 1 and separated into the optical fiber single core wire 211 and the linear body 212. The lengths of the optical fiber single core wire 211 constituting the wire 21 (optical fiber core wire 21) and the linear body 212 are different (as described above, when the linear body 212 is stretched). Thus, the actual length of the linear body 212 is shorter than the actual length of the single optical fiber 211, and in a state where they are separated (FIG. 4), the linear body 212 contracts and the linear body 212 becomes a single optical fiber. Shorter than the core 211 The length of the result terminal is not aligned.).

  The optical fiber single core wire 211 and the linear body 212 constituting the tape-shaped core wire 21 are different from each other in actual length, and the actual length of the stretched one is mainly larger than the actual length of the unstretched one. The length (actual length) between the optical fiber single core wire 211 and the linear body 212 is 100, but the longer length of the optical fiber single core wire 211 and the linear body 212 is 100. In this case, the shorter length is preferably 98.0 to 99.5. If the relationship between the two lengths is within such a range, when the tape-shaped core wire 21 is taken out from the cable 1, the optical fiber core wire 21 is surely curled. The shorter the shorter length, the smaller the curl diameter when the optical fiber core 21 is taken out, and the longer, the larger the curl diameter. Since the curl diameter can be adjusted by adjusting the relationship between the lengths of the optical fiber single core wire 211 and the linear body 212 in this way, it becomes possible to obtain a desired curl diameter according to the termination box or the like. It becomes easy to handle when stored in a termination box.

  As the optical fiber single core wire 211 constituting the tape-shaped core wire 21 (optical fiber core wire 21), a conventionally known optical fiber single core wire 211 may be used. For example, on the outer periphery of a quartz glass optical fiber, Those coated with an ultraviolet curable resin or a thermosetting resin can be used. The outer diameter of the optical fiber single core wire 211 can be appropriately determined depending on the required characteristics and the like, but may be about φ0.25 to 0.90 mm.

  There are no particular restrictions on the material or the like of the linear body 212, and for example, a wire made of the same material as the optical fiber single core wire 211, a metal wire, or the like can be used. Further, as will be described later, the cable 1 is heat-treated, the linear body 212 is thermally contracted, and the linear body 212 is stretched in the longitudinal direction (the linear body 212 is about to contract). In the case where the cable 1 is manufactured so that the linear body 212 is shorter than the optical fiber single core wire 211, the linear body 212 is a synthetic resin having heat shrinkability, for example, nylon 6 · 10. Nylon filaments such as nylon 6, nylon 6, 6 and nylon 12, polyester terephthalate, polyester naphthalate, polybutyl terephthalate and the like can be used.

  Moreover, when using the synthetic resin provided with heat-shrinkability as the linear body 212, it is preferable that a heat shrinkage rate shall be 0.5 to 2.0%. The outer diameter of the linear body 212 may be approximately 80 to 120% with respect to the outer diameter of the optical fiber single core wire 211, and is preferably substantially the same outer diameter as the optical fiber single core wire 211. .

  The optical fiber single core wire 211 and the linear body 212 may be integrated with, for example, an ultraviolet curable resin, a thermosetting resin, or the like to form the tape-shaped core wire 21 (optical fiber core wire 21). Here, for example, urethane acrylate or the like can be used as the ultraviolet curable resin, and epoxy resin or the like can be used as the thermosetting resin.

  About the tension member 22 which comprises the optical fiber cable 1 of the aspect shown in FIG. 1, as a usable tension member 22, metal wires, such as steel wires, such as a galvanized steel wire, a steel stranded wire, glass fiber, It can be comprised from the nonelectroconductive material which consists of nonmetallic wire materials, such as fiber reinforced plastics (FRP) containing a resin (organic) fiber. Further, the outer diameter of the tension member 22 may be approximately φ0.3 to 0.8 mm, and preferably φ0.4 to 0.5 mm.

  In the optical fiber cable 1 of the present invention, when the cross-sectional view adopts a rectangular or elliptical shape as shown in FIG. What is necessary is just to make 0 mm and a long diameter (long side) into about 2.0-6.0 mm in general.

  Examples of the synthetic resin constituting the sheath 23 covering the tape-shaped core wire 21 and the tension member 22 include polyethylene, linear low-density polyethylene, ethylene / α-olefin copolymer, polypropylene, propylene / α-olefin copolymer. Polymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid ester copolymer, ethylene / methacrylic acid ester copolymer, ethylene / acrylic acid copolymer, ethylene / methacrylic acid copolymer, ethylene / ethyl acrylate Polyolefin resins such as copolymers, thermoplastic resins such as ionomers, polyamides, polyurethanes, polyesters, polystyrenes and polyvinyl chlorides, thermoplastic resin elastomers, styrene butadiene rubber, butadiene rubber, isoprene rubber, acrylonitrile butadiene rubber, Examples thereof include synthetic rubbers such as ethylene propylene rubber, ethylene propylene terpolymer, butyl rubber, acrylic rubber, and silicone rubber. Further, an acid-modified product obtained by modifying the above-described thermoplastic resin with an unsaturated carboxylic acid and / or a derivative thereof can be used. One of these synthetic resins may be used alone, or two or more of these synthetic resins may be used in combination as a resin composition.

  The resin or resin composition constituting the sheath 23 in the optical fiber cable 1 of the present invention requires various resin components and various additives other than those described above within a range not impeding the purpose and effect of the present invention. Depending on the case, it can be added appropriately. As the additive, conventionally known ones can be used. For example, flame retardants, lubricants, modifiers, antioxidants, light stabilizers composed of metal hydrates such as magnesium hydroxide and aluminum hydroxide. , Process oil, silicone oil, UV absorber, carbon black, dispersant, pigment, dye, anti-blocking agent, crosslinking agent, crosslinking aid, etc. In addition, flame retardant aids such as polyphosphate compounds, zinc hydroxystannate, zinc stannate, zinc borate, calcium carbonate, hydrotalcite, and antimony oxide may be added.

  The notches 24 formed on both sides of the optical fiber cable 1 of the present invention having the configuration shown in FIG. 1 are used to remove the sheath 23 when taking out the tape-shaped core wire 21 (optical fiber core wire 21) from the optical fiber cable 1. It is arranged so that it can be easily torn. The notch 24 may be formed continuously over the longitudinal direction of the optical fiber cable 1 or may be formed intermittently over the longitudinal direction. The shape of the notch 24 can be an arbitrary shape such as a triangular shape, a semicircular shape, and a sharp blade shape, and the depth of the notch 24 may be determined as appropriate depending on the size of the optical fiber cable 1 or the like. In general, it may be about 0.3 to 0.6 mm.

  FIG. 6 is a cross-sectional view showing an aspect in which the support portion 3 is disposed in the optical fiber cable 1 of the present invention. The optical fiber cable 1 of the present invention includes a tape-shaped core wire 21 (optical fiber core wire 21) integrated with one of the optical fiber single core wire 211 and the linear body 212 being pulled in the longitudinal direction. ) And the sheath 23 covering the tape-shaped core wire 21, the above-described embodiment (referred to as the main body 2 with respect to the support 3 in FIG. 6) may be used. In addition, the support 3 may be provided. As the support wire 32 arrange | positioned at the support part 3, metal wires, such as a galvanized steel wire and steel strands, can be used. Further, the outer diameter of the support wire 32 may be appropriately determined according to the size of the optical fiber cable 1 to the support portion 3, the required strength, etc., but may be about φ1.0 to 2.6 mm.

  The support portion 3 is connected to the main body portion 2 by the connecting portion 4. The support portion 3 generally has an outer diameter of about 2.0 to 4.0 mm, and the optical fiber cable 1 of the present invention may be formed according to these dimensions. . Moreover, the connection part 4 should just be about 0.2-0.5 mm in width and about 0.1-2.0 mm in height.

  The optical fiber cable of the present invention in which either one of the optical fiber single core wire 211 and the linear body 212 constituting the tape-shaped core wire 21 (optical fiber core wire 21) is pulled in the longitudinal direction and stretched. 1 is manufactured in advance by producing a tape-shaped core wire 21 in which either one of the optical fiber single core wire 211 and the linear body 212 is stretched in the longitudinal direction and integrated in a stretched state, The tape-shaped core wire 21, the tension member 22 and the like are simply coated by extrusion coating a resin or a resin composition constituting the sheath 23 using a conventionally known extrusion molding method such as a tandem extrusion method or a common extrusion method. Can be manufactured.

  Further, when a heat-shrinkable synthetic resin is used as the linear body 212, the optical fiber single core wire 211 and the linear body 212 are integrated to form a tape-shaped core wire 21 (optical fiber core wire 21). Thereafter, the temperature of the sheath 23 when the optical fiber cable 1 is manufactured by extrusion-coating the sheath 23 in a molten state made of synthetic resin or the like on the tape-shaped core wire 21 and the tension member 22 is changed to the linear body 212. May be set to a temperature sufficient to cause heat shrinkage (for example, the heat shrinkage temperature of the material constituting the linear body 212 to 200 ° C.). Further, the cooling rate may be appropriately adjusted from the distance to the cooling water tank after the sheath 23 is extruded, the water temperature of the cooling water tank, and the production line speed. In this way, when the sheath 23 is extrusion-coated, the heat of the sheath is transferred to the linear body 212 and the linear body 212 is thermally contracted. However, the linear body 212 is covered together with the optical fiber single core wire 211. Since the wire body 212 is held and fixed to the sheath 23, the linear body 212 is maintained in a state of being stretched in the longitudinal direction of the cable 1. Therefore, the optical fiber cable 1 integrated with the linear body 212 being stretched in the longitudinal direction can be easily obtained.

  Further, when using a heat-shrinkable synthetic resin as the linear body 212, the cable 1 is manufactured after the sheath 23 is extruded and coated, and then the cable 1 is sufficient for the linear body 212 to thermally contract. By performing the heat treatment at the temperature, the linear body 212 is thermally contracted, and is pulled in the longitudinal direction and is stretched. What is necessary is just to determine suitably as heat processing temperature with the heat shrink temperature of the material which comprises the linear body 212, and should just be about 50-100 degreeC, Preferably about 60-90 degreeC. The processing time may be about 10 to 300 minutes, for example. On the other hand, since the linear body 212 is held by the sheath 23 to be covered together with the optical fiber single core wire 211 as described above, the linear body 212 is maintained in the state of being stretched in the longitudinal direction of the cable 1. Therefore, the optical fiber cable 1 integrated with the linear body 212 being stretched in the longitudinal direction can be easily obtained. As a means for the heat treatment, for example, the linear body 212 may be stored in a thermostat adjusted to a temperature (atmosphere temperature) sufficient for heat shrinking for an appropriate treatment time.

  The optical fiber cable 1 of the present invention can be easily obtained by adjusting the supply tension (supply tension) of the optical fiber single core wire 211 and the linear body 212 during manufacture in addition to the above-described method. Can do.

  An example of a method for manufacturing the optical fiber cable 1 of the present invention will be described with reference to FIGS. Here, FIG. 7 is a schematic view showing an aspect of a line (optical fiber cable production line 6) for producing the optical fiber cable 1 of the present invention. FIG. 8 is a diagram of the tension adjusting unit 62a in FIG. It is the schematic which showed the one aspect | mode.

  In the optical fiber cable production line 6 shown in FIG. 7, the optical fiber single core wire 211 and the linear body 212 are integrated into a tape-shaped core wire 21 (optical fiber core wire 21), and the tape The process of extrusion-coating the sheath 23 made of resin or resin composition on the core wire 21 and the tension member 22 is performed in one line (one process).

  Specifically, the optical fiber single core wire 211 and the linear body 212 delivered from the supplies 611 and 612 are passed through the ultraviolet curable resin application unit 63 while adjusting the supply tension with the tension adjusting units 62a and 62b. A tape-shaped core wire 21 (optical fiber core) in which the optical fiber single core wire 211 and the linear body 212 are integrated by applying an ultraviolet curable resin and then passing through the ultraviolet irradiation unit 64 to cure the ultraviolet curable resin. Line 21). Then, the tape-shaped core wire 21 and the tension member 22 delivered from the supplies 613 and 614 are arranged on both sides of the tape-shaped core wire 21 so that the tension members 22 are aligned in parallel with the tape-shaped core wire 21 in the longitudinal direction. The sheath 23 made of a synthetic resin or a synthetic resin composition is extrusion coated from the extrusion portion 65 onto the tape-shaped core wire 21 and the tension member 22, cooled by the cooling portion 66, and then wound by the winding portion 67. Become.

  Here, in the tension adjusters 62a and 62b, the supply tensions of the two wires of the optical fiber single core wire 211 and the linear body 212 are adjusted. If the supply tension is adjusted so that one of the optical fiber single-core wire 211 and the linear body 212 has a higher tension than the other, the wire with the higher tension is longer than the wire with the lower tension. In the state of being pulled in the direction, the tape-shaped core wire 21 (optical fiber core wire 21) is drawn, and the optical fiber cable 1 is obtained. Since the wire (the optical fiber single-core wire 211 or the linear body 212) stretched in the longitudinal direction is held by the sheath 23 to be covered, the wire is maintained in the stretched state in the longitudinal direction of the cable 1. Therefore, it is possible to easily obtain the optical fiber cable 1 in which one of the optical fiber single core wire 211 and the linear body 212 is integrated in a state of being stretched in the longitudinal direction.

  The supply tension may be about 50 g to 1600 g for both the optical fiber single fiber 211 and the linear body 212. The tension of the wire to be stretched is 600 to 1600 g, and the tension of the wire that is not to be stretched is set. What is necessary is just to be 50-200 g. In addition, regarding the relationship between the supply tensions of the optical fiber single core wire 211 and the linear body 212, when the smaller tension is set to 100, the larger tension is preferably set to 600 to 1050. By setting the relationship between the two supply tensions within such a range, either one of the optical fiber single core wire 211 and the linear body 212 is integrated in a state of being pulled in the longitudinal direction, and the optical fiber single core wire 211 and The optical fiber cable 1 in which the length of the linear body 212 is different can be obtained efficiently and reliably. As for the relationship of the supply tension, it is particularly preferable that the larger tension is 800 to 1050 when the smaller tension is 100.

  Taking an optical fiber single core wire 211 as an example, one aspect of the tension adjusting unit 62a will be described. FIG. 8 is a schematic view showing an aspect of the tension adjusting unit 62a in FIG. In the tension adjusting unit 62a shown in FIG. 8, the optical fiber single core wire 211 passes through two pulleys 621 and 622 among the pulleys 621, 622, and 623 arranged in the tension adjusting unit 62a. In addition, a load is applied to the movable pulley 622 via a fixed pulley 623. In the configuration of FIG. 8, the optical fiber single core wire 211 is subjected to a half tension of the load 624, and the magnitude of the load 624 is set to the tension adjusting unit 62 a through which the optical fiber single core wire 211 passes. In the tension adjusting unit 62b (see FIG. 7) through which the linear body 212 passes, one of the optical fiber single core wire 211 and the linear body 212 is adjusted by appropriately adjusting one supply tension to be larger than the other. One of them is pulled in the longitudinal direction and integrated in a stretched state, and the optical fiber cable 1 in which the lengths of the optical fiber single-core wire 211 and the linear body 212 are different is obtained.

  As described above, the optical fiber cable 1 according to the present invention includes a single optical fiber cable 21 (optical fiber core wire 21) in which the optical fiber single core wire 211 and the linear body 212 are integrated. Since either one of the core wire 211 and the linear body 212 is integrated in a state of being stretched in the longitudinal direction, when the tape-shaped core wire 21 (optical fiber core wire 21) is taken out from the cable 1, The tape-shaped core wire 21 is curled, and the extra length of the cable 1 can be accommodated in the miniaturized termination box without any problem, and the working efficiency is improved. Further, since the tape-shaped core wire 21 is curled when the tape-shaped core wire 21 is taken out from the cable 1 in this way, even when the cable 1 is terminated, a conventionally used fusion or mechanical splice is used. Base materials, tools, jigs, etc. can be used as they are, and it is excellent in cost measures.

The aspect described above shows one aspect of the present invention, and the present invention is not limited to the above-described embodiment, and has the configuration of the present invention and can achieve the objects and effects. It goes without saying that modifications and improvements within the scope are included in the content of the present invention. Further, the specific structure, shape, and the like in carrying out the present invention are not problematic as other structures, shapes, and the like as long as the objects and effects of the present invention can be achieved. The present invention is not limited to the above-described embodiments, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

  For example, in FIG. 1 described above, as an example of the configuration of the optical fiber cable 1 according to the present invention, the tension member 22 is provided on both sides of the tape-shaped core wire 21, but the arrangement of the tension member 22 is essential. Instead, a tape-shaped core wire 21 (optical fiber core wire 21) integrated with one of the optical fiber single core wire 211 and the linear body 212 being pulled in the longitudinal direction, and the tape shape If it is the optical fiber cable 1 which has the sheath 23 which coat | covers the core wire 21, the structure can be determined arbitrarily.

  When the tension member 22 is disposed in the optical fiber cable 1, it is disposed on both sides of the tape-shaped core wire 21 (optical fiber core wire 21) as shown in FIG. 1, FIG. 2, and FIG. For example, the tension member 22 may be disposed on one side of the tape-shaped core wire 21.

  In the above-described embodiment, the optical fiber cable 1 in which the notch 24 is formed in the optical fiber cable 1 is shown in FIG. 1 and the like, but the notch 24 may not be formed in the cable 1.

In the production line of FIG. 7, the configuration of the tension adjusting units 62 a and 62 b that adjust the tension of the optical fiber single core wire 211 and the linear body 212 has been described with reference to FIG. 8 as an example. The configuration and mechanism of 62b are not limited to the configuration of FIG. 8, and any configuration can be adopted.
In addition, the specific structure, shape, and the like in the implementation of the present invention may be other structures as long as the object of the present invention can be achieved.

EXAMPLES Hereinafter, although an Example and a comparative example are given and this invention is demonstrated more concretely, this invention is not restrict | limited at all by these Examples.

[Examples 1 to 3 and Comparative Example 1]
A linear body 212 made of a monofilament of φ0.25 mm, an optical fiber single-core wire 211 and a φ0.25 mm nylon 6/10 whose thermal shrinkage is shown in Table 1 is coated with an ultraviolet curable resin, and the size is 0.27 mm. A 0.6 mm tape-shaped core wire 21 (optical fiber core wire 21) was used. The two tension members 22 are arranged so as to sandwich the tape-shaped core wire 21, and the non-halogen flame retardant polyolefin is used as a synthetic resin constituting the sheath 23, and the optical fiber cable 1 having the configuration shown in FIG. Manufactured.

  It should be noted that the nylon 6 · 10 monofilament as the linear body 212 is subjected to heat treatment for holding alone at 70 ° C. for 30 minutes (or more) (shown in Table 1 for Comparative Example 1). It was obtained by adjusting the stretching conditions at the time of manufacture so that the thermal shrinkage rate = 0). The specifications of the optical fiber cable 1 other than the specifications of the linear body 212 are as follows.

(Specifications of optical fiber cable 1)
Sheath material: Non-halogen flame-retardant polyolefin Tape-shaped core wire 21: φ0.25mm optical fiber single-core wire 211 having an ultraviolet curable resin coating on the outer periphery of a quartz glass of φ0.125mm, and a nylon 610 monofilament of φ0.25mm One piece of tape-shaped core wire made by coating a linear body 212 made of UV-curing resin to 0.27 mm × 0.6 mm Tension member 22: Galvanized steel wire (outer diameter φ0.4 mm)
Short diameter of cable 1: 2.0 mm
Long diameter of cable 1: 3.1 mm
Notch 24 depth: 0.4 mm

  Next, the obtained optical fiber cable 1 was bundled with a length of 500 m, and then placed in a thermostatic chamber adjusted to an atmospheric temperature of 70 ° C. for 3 hours and heat-treated. As a result, the linear body 212 inside the cable 1 of Example 1 to Example 3 was thermally contracted, and was pulled in the longitudinal direction of the cable 1 inside the cable 1 and stretched (tried). Note that the length (actual length) of the linear body 212 after heat shrinkage is the length of the optical fiber single core wire 211 (the length of the optical fiber single core wire 211 because the optical fiber single core wire 211 is not thermally contracted). Is the same as the actual length, and the same applies to the optical fiber single-core wires 211 of Examples 4 to 6 and Comparative Example 2). On the other hand, in the optical fiber cable of Comparative Example 1, since the linear body 212 does not contract, the lengths (actual lengths) of the optical fiber single core wire 211 and the linear body 212 are equal.

  Then, when the cable 1 taken out from the thermostat after the heat treatment for 3 hours is torn the sheath 23 with the notch 24 as a trigger, and the tape-shaped core wire 21 (optical fiber core wire 21) inside the cable 1 is taken out. The presence or absence of curling of the optical fiber core wire 21 and the diameter (curl diameter) when curled were measured and compared and evaluated. The results are also shown in Table 1.

(Thermal shrinkage and measurement results of linear bodies)

  As shown in Table 1, the linear body 212 is thermally contracted and is stretched in the longitudinal direction of the cable 1 inside the cable 1 (the actual length of the linear body 212 after the thermal contraction is an optical fiber. The optical fiber cables 1 of the first, second, and third embodiments (shorter than the actual length of the single core wire 211) are opened by tearing the sheath 23, and the tape-shaped core wire 21 (optical fiber core) inside the cable 1 When the wire 21) was taken out, the tape-shaped core wire 21 was curled as shown in FIG. When the tape-shaped core wire 21 inside the cable 1 is taken out, the tape-shaped core wire 21 is curled, so that the extra length of the cable 1 can be stored in the miniaturized termination box without any problem. Thus, the optical fiber cable 1 with good working efficiency is obtained. In addition, a conventionally used base material for fusion or mechanical splicing can be used as it is for termination.

  On the other hand, the linear body 212 is not thermally contracted and is not stretched in the longitudinal direction inside the cable 1, and the lengths (actual lengths) of the optical fiber single core wire 211 and the linear body 212 are equal. The optical fiber cable No. 1 did not curl when the tape-shaped core wire 21 (optical fiber core wire 21) was taken out.

[Examples 4 to 6 and Comparative Example 2]
As the linear body 212, an optical fiber single core wire having the same specifications as the optical fiber single core wire 211 (that is, the optical fiber single core wire 211 and the two linear bodies 212 are two optical fiber single core wires) was used. When the cable 1 is manufactured, the line 6 shown in FIG. 7 is used to manufacture the tape-shaped core wire 21 (optical fiber core wire 21) and the sheath 23 for the tape-shaped core wire 21 and the tension member 22. Extrusion coating was performed in one process (line), and the tension of the two optical fiber single core wires 211 at the time of production was as shown in Table 2. As shown in Table 2, the tension of two optical fiber single core wires 211 (referred to as “optical fiber single core wire 211” and “optical fiber single core wire (linear body 212)” for convenience) is shown. The difference was designated as Example 4, Example 5 and Example 6, and the same tension was designated as Comparative Example 1.

  The optical fiber cable 1 is manufactured in accordance with FIG. 7 with the tensions of the two optical fiber single core wires in the relationship shown in Table 2, and according to FIG. Is coated with an ultraviolet curable resin to form a tape-shaped core wire 21 (optical fiber core wire 21) of 0.27 mm × 0.6 mm, and then the two tension members 22 are sandwiched between the tape-shaped core wires 21. The non-halogen flame retardant polyolefin is used as the synthetic resin constituting the sheath 23, and the optical fiber cable 1 having the configuration shown in FIG. 1 is manufactured by extrusion molding. The specifications of the optical fiber cable 1 other than the tape core 21 are the same as those in the first embodiment.

  Then, for the obtained cable 1, as in Example 1 and the like, the sheath 23 was torn by using the notch 24 as a trigger, and the tape-shaped core wire 21 (optical fiber core wire 21) inside the cable 1 was taken out. The presence or absence of curling of the tape-shaped core wire 21 and the curl diameter were measured and compared and evaluated. The results are also shown in Table 2. In Table 2, “the length of the optical fiber single-core wire (linear body 212)” indicates the actual length.

(Supply tension and measurement results)

  As shown in Table 2, the tensions of the two optical fiber single wires 211 are different, and the optical fiber single wire (the linear body 212) having the larger tension is stretched in the longitudinal direction of the cable 1 inside the cable 1. Example 4, Example 5 and Example in which the length (actual length) of the optical fiber single core wire (linear body 212) is shorter than the length (actual length) of the optical fiber single core wire 211 having a small tension. When the optical fiber cable 1 of Example 6 tears the sheath 23 and takes out the tape-shaped core wire 21 (optical fiber core wire 21) inside the cable 1, the tape-shaped core wire 21 is curled as shown in FIG. did. Similar to the optical fiber cables of the first to third embodiments, when the tape-shaped core wire 21 inside the cable 1 is taken out, the tape-shaped core wire 21 is curled, thereby reducing the size of the termination box. In addition, the extra length of the cable 1 can be stored without any problem, and the working efficiency is improved. Further, at the time of termination, as in the case of the optical fiber cable 1 of the first embodiment or the like, a conventionally used base material for fusion or mechanical splicing can be used as it is.

  On the other hand, the tension of the two optical fiber single-core wires 211 is equal, and the length (actual length) of the two optical fiber single-core wires 211 is not stretched in the longitudinal direction of the cable 1 inside the cable 1. In the optical fiber cable of Comparative Example 2 in which the tape-shaped core wire 21 (optical fiber core wire 21) was taken out, the tape-shaped core wire 21 did not curl.

It is sectional drawing which showed one Embodiment of the structure of the optical fiber cable of this invention. FIG. 2 is a schematic diagram illustrating a configuration of a cable terminal in the optical fiber cable of FIG. 1. FIG. 3 is a schematic view showing a state where a tape-shaped core wire is curled in the optical fiber cable of FIG. 2. In the optical fiber cable of FIG. 2, it is the schematic which showed the state which isolate | separated the optical fiber single core wire and the linear body. FIG. 3 is a schematic view showing a state in which an optical fiber single core wire is taken out from the optical fiber cable of FIG. 2. FIG. 2 is a cross-sectional view showing an aspect in which a support portion is provided in the optical fiber cable of FIG. It is the schematic which showed the one aspect | mode of the line which manufactures the optical fiber cable of this invention. In FIG. 7, it is the schematic which showed the one aspect | mode of the tension adjustment part. It is sectional drawing which showed the structure of the conventional optical fiber cable.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber cable 2 Main-body part 21 Tape-shaped core wire (optical fiber core wire)
DESCRIPTION OF SYMBOLS 211 Optical fiber single core wire 212 Linear body 22 Tension member 23 Sheath 24 Notch 3 Support part 32 Support line 4 Connection part 6 Optical fiber cable manufacturing line 611,612,613,614 Supply 62a, 62b Tension adjustment part 621,623 Pulley (Fixed pulley)
622 pulley (moving pulley)
624 Load 63 UV curable resin application part 64 UV irradiation part 65 Extrusion part 66 Cooling part 67 Winding part 9 Conventional optical fiber cable

Claims (8)

In an optical fiber cable having a tape-shaped core wire in which an optical fiber single core wire and a linear body are integrated, and a sheath covering the tape-shaped core wire,
An optical fiber cable, wherein either one of the optical fiber single core wire and the linear body is integrated in a state where the optical fiber single core wire and the linear body are stretched straight in the longitudinal direction of the cable. Of the single optical fiber and the linear body, the length of the stretched state that is released from the stretched state and returned to the original state, or the length of the thermal contracted state a fiber optic cable according to claim 1, characterized in that shorter than the actual length of the person who is not stretched. Claims the actual length of the linear body and the optical fiber single fiber is, when the longer length and 100, the shorter the length of the is characterized by a 98.0 to 99.5 An optical fiber cable according to claim 1 or 2.   The light according to any one of claims 1 to 3, wherein a tension member is arranged on both sides or one side of the tape-shaped core wire in parallel with the tape-shaped core wire in the longitudinal direction. Fiber cable. A method of manufacturing an optical fiber cable according to claim 1, comprising:
The linear body is made of a synthetic resin having heat shrinkability,
An optical fiber cable characterized in that when the tape-shaped core wire is covered with the sheath, the linear body is covered with a sheath having a temperature sufficient to cause heat shrinkage, and the linear body is thermally shrunk. Production method. A method of manufacturing an optical fiber cable according to claim 1, comprising:
The linear body is made of a synthetic resin having heat shrinkability,
A method of manufacturing an optical fiber cable, comprising: heat-treating a cable covered with a sheath at a temperature sufficient to cause the linear body to thermally contract, thereby thermally contracting the linear body. A method of manufacturing an optical fiber cable according to claim 1, comprising:
The step of integrating the optical fiber single core and the linear body into the tape-shaped core, and the step of covering the tape-shaped core with a sheath, are performed in one line,
The tape-shaped core wire is formed by integrating the optical fiber single-core wire and the linear body with different tension applied when the tape-shaped core wire and the supply of the linear body are fed out. An optical fiber cable manufacturing method characterized by the above. The optical fiber cable manufacturing method according to claim 7, wherein the tension applied when being fed out from the supply is 600 to 1050 when the smaller tension is 100. Method.

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