JP2005250150A - Optical fiber unit, optical fiber cable using the same, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make optical fibers into a unit in order to improve manufacturability and performance of intermediate post-branching of an optical cable. <P>SOLUTION: An optical fiber unit 1 is constituted by converging a plurality of optical fibers 3 stored in an optical fiber cable 5. Since each optical fiber 3 is constituted of a coating material 9 having surface tackiness, the plurality of optical fibers 3 are easily and quickly brought into close contact with one another by the surface tackiness and are made into the optical fiber unit 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical fiber unit, an optical fiber cable using the optical fiber unit, and a method of manufacturing the optical fiber unit, and more particularly, to an optical fiber so as to improve the manufacturability of the optical cable and the intermediate post-branching property in the structure of a single-core slot optical cable. The present invention relates to a unitized optical fiber unit, an optical fiber cable using the optical fiber unit, and a manufacturing method thereof.

  An optical fiber cable (hereinafter simply referred to as an “optical cable”) configured by housing a plurality of optical fibers of 0.25 mmφ is to improve the connection workability with a plurality of optical fibers of the downstream optical cable. In addition, a plurality of optical fibers housed in the optical cable are bundled in advance and unitized.

  Referring to FIGS. 8A, 8B, and 9, conventionally, in order to form a plurality of optical fibers 101 as a unit into an optical fiber unit 103, a plurality of optical fibers 101 are vertically attached. The mainstream is a bundle of bunching yarns 105 bound to the outer periphery. For example, when the colored optical fiber 101 is accommodated in a single slot in the slot groove 111 of the slot 109 of the optical cable 107 as shown in FIG. 9, four optical fibers 101 (for example, the outer diameter is 0.5 mm). It is general to use a structure in which a plurality of units are accommodated in one slot groove 111 by roughly winding an optical fiber core wire) with a bunching yarn 105 as an optical fiber unit 103.

As the optical cable 107, for example, as shown in FIG. 9, there is an aerial round type 32-core optical cable, and there are four slot grooves 111 formed by SZ twist on the outer periphery of a slot 109 having a tension member 113 at the center. One or a plurality of the optical fiber units 103 (two optical fiber units 103 in FIG. 9) are accommodated in each slot groove 111, and a presser winding 115 made of a nonwoven fabric or the like is wound around the outer periphery of the slot 109. Then, a cable sheath 117 made of polyethylene resin or the like is applied to the outer periphery of the presser winding 115 (see, for example, Patent Document 1 and Patent Document 2).
Japanese Patent No. 3423192 JP-A-9-152529

  By the way, in the conventional optical fiber unit 103, in order to prevent the optical fiber unit 103 taken out from the optical cable 107 from being scattered immediately at the time of connection work for connecting the optical fiber 101, a plurality of optical fibers 101 are provided. Are roughly wound by a bunching yarn 105 at a short pitch of about 20 mm and bound. For this reason, there is a problem that the processing of the bunching yarn 105 is troublesome at the time of connection work.

  Also, when the optical fiber unit 103 is bound with a plurality of optical fibers 101 with the bunching yarn 105, the optical fiber unit 103 will be scattered unless it is bound with a short pitch of about 20 mm. For this reason, since the bind speed at the time of manufacture of the optical fiber unit 103 becomes slow, the linear speed for forming an optical cable in a subsequent process is limited. That is, there is a problem that the manufacturability of the optical cable 107 is deteriorated.

  The present invention has been made to solve the above-described problems.

The optical fiber unit of the present invention is an optical fiber unit formed by converging a plurality of optical fibers housed in an optical fiber cable.
Each of the optical fibers is composed of an outermost layer covering material having a surface tack property, and the plurality of optical fibers are closely adhered to each other by the surface tack property.

The optical fiber unit of the present invention is an optical fiber unit formed by converging a plurality of optical fibers housed in an optical fiber cable.
Each optical fiber is composed of an outermost layer covering material having surface tackiness, and the plurality of optical fibers are brought into close contact with each other by the surface tackiness, and a wire is roughly wound around the outer periphery of the plurality of optical fibers. It is characterized by comprising.

  In the optical fiber unit of the present invention, in the optical fiber unit, it is preferable that the optical fiber has a tack value quantitatively indicating the surface tack property within a range of 0.5N to 1.2N.

An optical fiber cable according to the present invention comprises an optical fiber unit by converging a plurality of optical fibers and a cable core containing one or a plurality of the optical fiber units, and a cable sheath covering an outer peripheral portion of the cable core; , And
The optical fiber unit is configured by forming each optical fiber with an outermost coating material having surface tackiness, and forming the plurality of optical fibers in close contact with each other by the surface tackiness. Is.

An optical fiber cable according to the present invention comprises an optical fiber unit by converging a plurality of optical fibers and a cable core containing one or a plurality of the optical fiber units, and a cable sheath covering an outer peripheral portion of the cable core; , And
The optical fiber unit is configured such that each optical fiber is composed of a coating material of an outermost layer having surface tackiness, and the plurality of optical fibers are brought into close contact with each other by the surface tackiness and are disposed on the outer periphery of the plurality of optical fibers. It is characterized by comprising a wire body roughly wound.

  In the optical fiber cable of the present invention, in the optical fiber cable, it is preferable that the optical fiber has a tack value quantitatively indicating the surface tack property within a range of 0.5N to 1.2N.

  In the optical fiber cable according to the present invention, the cable core includes a slot having a tensile body at a central portion and a slot groove at an outer peripheral portion, and one or a plurality of the optical fiber units are accommodated in the slot groove. It is preferable.

The method of manufacturing an optical fiber cable according to the present invention includes a step of forming an optical fiber unit by closely attaching and converging a plurality of optical fibers provided with a coating material of an outermost layer having surface tackiness by the surface tackiness. ,
Supplying one or a plurality of the optical fiber units to the extrusion head;
Extruding a resin for a cable sheath to the extrusion head;
Extruding the outer periphery of the one or more optical fiber units so as to cover with a cable sheath;
It is characterized by comprising.

The method of manufacturing an optical fiber cable according to the present invention includes a step of forming an optical fiber unit by closely attaching and converging a plurality of optical fibers provided with a coating material of an outermost layer having surface tackiness by the surface tackiness. ,
Storing one or a plurality of the optical fiber units in the slot groove of a slot having a tensile body at the center and a slot groove at the outer periphery, and forming a cable core;
Supplying the extrusion head by running the cable core;
Extruding a resin for a cable sheath to the extrusion head;
Extruding to cover the outer periphery of the cable core with a cable sheath;
It is characterized by comprising.

  In the method for manufacturing an optical fiber cable according to the present invention, in the method for manufacturing an optical fiber cable, in the step of forming the optical fiber unit, it is preferable that a wire is roughly wound around an outer periphery of the plurality of optical fibers.

  As understood from the means for solving the above problems, according to the present invention, the optical fiber unit uses an optical fiber having an appropriate surface tack property when converging a plurality of optical fibers. Therefore, even without using a striated body such as a bunching yarn, the respective optical fibers can be brought into close contact with each other and focused. By housing this optical fiber unit in an optical fiber cable, for example, it is possible to improve the workability of intermediate post branching of a single-core overhead cable and improve the manufacturability of an optical fiber cable. .

  Further, an optical fiber unit formed by roughly winding a linear body around the outer periphery of a plurality of optical fibers unitized as described above, for example, the twist pitch of the linear body is set to the bunching yarn of a conventional optical fiber unit. The twist pitch is longer than the twist pitch.

  As a result, the optical fiber cable using this optical fiber unit prevents the optical fiber from being dispersed by the filament even if the optical fiber breaks due to an extraordinary force applied to the optical fiber unit during the intermediate post-branching work. it can. Moreover, since the twist pitch of the said linear body is long, an intermediate | middle post branching work can be performed, without caring about a linear body at the time of the construction of an intermediate post branch. Moreover, since the twist pitch of the said linear body is long, the rough winding process of a linear body does not become a factor by which the line speed of optical cable formation is restrict | limited also at the time of manufacture of an optical fiber cable. That is, the optical cable can be manufactured at high speed.

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

  Referring to FIGS. 1A to 1C, an optical fiber unit 1 according to this embodiment is a unit in which a plurality of optical fibers 3 are converged and is shown in FIG. As described above, these are accommodated in various optical fiber cables 5 (hereinafter simply referred to as “optical cables”). In this embodiment, the optical fiber 3 includes an optical fiber strand (for example, an outer diameter of 0.25 mm) defined by JIS and an optical fiber core wire (for example, an outer diameter of 0.5 mm). It is.

  In this embodiment, for example, four optical fiber strands as the optical fiber 3 are unitized to form the optical fiber unit 1, and the optical fiber strand is an outer periphery of a bare optical fiber 7 made of quartz glass of 125 μmφ. Is coated with a coating resin 9 such as a UV resin as a coating material to have a diameter of 250 μmφ. When the coating resin 9 has a plurality of layers, at least the surface of the outermost coating resin 9 has appropriate stickiness and tackiness (tackiness). As a result, the optical fiber unit 1 composed of the four-fiber optical fibers 3 can be brought into close contact with each other due to the above-described surface tackiness without performing a treatment such as winding with a bind yarn as in the prior art. It is in an integrated state. The state in which the four-fiber optical fiber 3 is unitized is shown in one of FIGS. 1B and 1C or in a substantially similar state.

  Note that the surface tackiness of the optical fiber 3 needs to be in the following range. That is, the lower limit of the tackiness range is that the four-fiber optical fiber unit 1 passes several rollers (rollers) on the production line when the optical cable 5 is manufactured. Adhesive strength to the extent that the optical fiber 3 does not fall apart is required at a minimum. On the other hand, as the upper limit of the tackiness range, since it is necessary to select one optical fiber 3 from the four-core unit when connecting the optical cable 5, the adhesive force should be suppressed to the extent that the operator does not feel stress. .

  Therefore, in this embodiment, the surface tackiness of the optical fiber 3 can be controlled by quantifying and defining the surface tackiness as follows.

(1) A UV curable resin (ultraviolet curable resin) is used as the outermost layer of the optical fiber 3 (the coating resin 9 in this embodiment).

(2) During the curing of the outermost layer, the irradiation amount of a UV lamp (ultraviolet irradiation lamp) and the oxygen concentration during curing are controlled.

  That is, after the UV curable resin is applied as the outermost layer of the optical fiber 3, the degree of curing of the UV curable resin, in other words, the surface tackiness of the UV curable resin is adjusted by UV lamp irradiation in an air atmosphere. can do.

  Referring to FIGS. 2 (A) to 2 (C) and FIG. 3, quantitative evaluation on the surface tackiness of the optical fiber 3 was performed as follows. The optical fibers 3 used in the above test are all the same optical fiber 3.

(1) Several optical fibers 3 </ b> A (six in FIG. 2 and FIG. 3) are arranged in parallel on the test bench 11.

(2) Two optical fibers 3B each having a length of 0.5 m are attached so as to be in contact with two adjacent optical fibers 3A out of the six optical fibers 3A, and the two optical fibers 3B. The optical fibers 3B are placed at positions having appropriate intervals.

(3) A flat plate 13 (length 0.5 m) weighing 1 g is placed on the two optical fibers 3B having a length of 0.5 m. This pressurization time was 30 seconds.

(4) After the flat plate 13 is removed, the tag 15 previously wound around each of the two optical fibers 3B is gripped and pulled by the tensile tester 17, and the tensile force is measured.

(5) Pull until the upper 0.5 m optical fiber 3B is separated from the lower optical fiber 3A, and monitor the measured value of the tensile tester 17. The maximum value of this measured value is the tack value of the optical fiber 3.

Next, in order to determine an appropriate value of the tack value defined as described above, the optical cable 5 is manufactured by changing the surface tack property of the optical fiber 3 in various ways, and the manufacturability of the optical cable 5 and the handleability of the optical cable 5 I investigated. The manufacturability of the optical cable 5 was determined based on whether or not the optical fiber 3 could pass through the pass line without being scattered during the production of the optical cable. Further, as shown in FIG. 5, the handling of the optical cable 5 is such that one optical fiber 3 can be easily taken out from the four optical fiber units 1 taken out from the optical cable 5 at the time of intermediate rear branching. Judged. The results are listed in Table 1.

  As shown in Table 1, when the adhesion (tack value) between the optical fibers 3 is between 0.5 and 1.2 N, both the manufacturability of the optical cable 5 and the handleability of the optical cable 5 are You can see that they are satisfied at the same time. Therefore, the appropriate range of the surface tackiness of the optical fiber 3 is such that the tack value T is 0.5N ≦ T ≦ 1.2N.

  Referring to FIG. 4, the optical cable 5 according to the embodiment of the present invention is provided with four slot grooves 23 formed in SZ twist on the outer periphery of a slot 21 having a tension member 19 as a strength member at the center. In each slot groove 23, one or a plurality of the optical fiber units 1 are housed. In this embodiment, two optical fiber units 1 are housed. Further, a presser winding 25 made of a nonwoven fabric or the like is wound around the outer periphery of the slot 21, and these constitute a cable core 27 as a whole.

  A cable sheath 29 (jacket) covers the outer periphery of the cable core 27, and the cable sheath 29 is made of PE (polyethylene) or PVC (polyvinyl chloride).

  Next, the manufacturing method of said slot type optical cable 5 is demonstrated.

  Referring to FIG. 6, an optical cable manufacturing apparatus 31 used in this embodiment includes a slot sending apparatus 33 for sending out a slot 21 and a plurality of optical fiber units for producing a plurality of optical fiber units 1. A manufacturing device 35, a twisting device 37 for storing a plurality of optical fiber units 1 in the slot groove 23 of the slot 21, and a presser winding around the slot 21 in which the optical fiber unit 1 is stored by the twisting device 37 A presser winding device 39 for winding up the cable 25, and an extruder 41 for extruding the optical cable 5 by covering the cable sheathing resin on the presser winding 25. Yes.

  In this embodiment, the slot delivery device 33 is provided with one slot delivery bobbin 43, and the slot 21 with the tension member 19 is wound around the center. In this embodiment, the slot 21 is provided with four SZ twisted slot grooves 23 as shown in FIG.

  Each optical fiber unit manufacturing apparatus 35 includes four optical fiber delivery bobbins 45, and the optical fiber 3 is wound around each optical fiber delivery bobbin 45. The optical fibers 3 delivered from the optical fiber delivery bobbin 45 are assembled on a unit assembly plate 47 so that their surfaces come into contact with each other and are assembled into a unit. The converged optical fibers 3 are sandwiched between a plurality of pressing rollers 49 and pressed for a predetermined time, for example, 30 seconds.

  Thereby, since the surface of the coating resin 9 has moderate stickiness and adhesiveness (tackiness) in the optical fiber 3, the four-fiber optical fibers 3 are brought into close contact with each other due to the surface tackiness. . The unitized optical fiber unit 1 is turned by the guide roller 51 and sent to the twisting device 37 in the next process.

  As the twisting device 37, for example, a twisting control plate (not shown) is provided. The twist control plate is provided with one slot insertion hole that can pass through the slot 21 at the center, and four unit insertion holes that can pass through the optical fiber unit 1 around the slot insertion hole. Yes. The twisting control plate is repeatedly rotated in the forward and reverse directions, that is, in the clockwise and counterclockwise directions toward the feeding direction of the slot 21 in order to twist the optical fiber unit 1 in the slot groove 23 and SZ. It is configured as follows.

  The slot delivery bobbin 43 is rotated so that the slot 21 is sent out through the slot insertion hole of the twisting control plate, and a total of eight optical fiber units 1 are arranged in the four twisting control plates. The two optical fiber units 1 are sent out to the unit insertion holes, that is, to the respective unit insertion holes.

  In the twisting device 37, the twisting control plate is alternately rotated in the forward and reverse directions so that the two optical fiber units 1 are inserted into the slot grooves 23 of the SZ twist of the slot 21.

  In the presser winding device 39, the presser winding 25 delivered from the presser winding delivery bobbin 53 is wound around the slot 21 in a state where the two optical fiber units 1 are inserted into the slot grooves 23, so that the cable core 27 is formed.

  The cable core 27 is delivered to a cable sheath resin die 57 of an extrusion head 55 provided in the extruder 41. The cable sheath resin die 57 is formed into a substantially cylindrical shape so that, for example, polyethylene resin as a cable sheath resin is formed as a cable sheath 29 so as to wrap around the presser winding 25 wound around the slot 21 and to be pushed out. It has become.

  In the above state, for example, polyethylene resin as the resin material of the cable sheath 29 heated and smelted is injected into the extruder 41 and extruded from the extrusion head 55, so that the polyethylene resin of the cable sheath 29 is outside the cable core 27. It is extruded into a substantially cylindrical shape by pipe extrusion so as to cover the periphery. At this time, the cable core 27 is fed in accordance with the speed at which the polyethylene resin as the cable sheath resin is pushed out, so that the optical cable 5 having the cross-sectional shape shown in FIG.

  That is, the manufacturing method of the optical cable 5 includes the following steps.

(1) Step of forming optical fiber unit 1 by converging four optical fibers 3 having surface tackiness and pressing and pressing them with pressing roller 49 (2) Twist eight optical fiber units 1 (3) Optical fiber: a process of forming a cable core 27 by twisting with a twist control plate of the device 37 to be inserted into a predetermined position of the slot groove 23 of the slot 21 and winding a presser winding 25 around the outer periphery of the slot 21 A step of feeding the cable core 27 having the unit 1 inserted therein and supplying it to the die 57 of the extrusion head 55 (4) A step of extruding a polyethylene resin as a cable sheath resin to the die 57 of the extrusion head 55 (5) Step of extrusion so as to provide a cable sheath 29 so as to cover the outer periphery of the cable core 27. The forming process of the fiber unit 1, the supplying process of the one slot 21 and the eight optical fiber units 1, and the press core 25 are wound around the outer periphery of the slot 21 to form the cable core 27. And the step of extruding the resin for the cable sheath from the die 57 of the extrusion head 55 are simultaneously performed in a continuous process, and the optical cable 5 is quickly manufactured.

  From the above, the optical fiber unit 1 according to this embodiment uses the optical fiber 3 having a moderately adjusted surface tack property to converge the plurality of optical fibers 3, so that a bunching yarn or the like is conventionally used. It is possible to easily focus at high speed without using the striatum. By housing the optical fiber unit 1 in the optical cable 5, for example, the manufacturability of the optical cable 5 can be improved. Furthermore, for the reasons described above, there is no wire body such as a short pitch bunching yarn as in the prior art, so that the workability of the intermediate post branching of the optical cable 5 can be improved.

  Next, an optical fiber unit according to another embodiment of the present invention will be described with reference to the drawings.

  Referring to FIG. 7, an optical fiber unit 59 of this embodiment is, for example, a linear member from above the optical fiber unit 1 including the four-fiber optical fiber 3 having the surface tackiness of the above-described embodiment. The bunching yarn 61 is roughly wound. However, the twist pitch of the bunching yarn 61 is 10 times the twist pitch of the bunching yarn of a general conventional optical fiber unit, for example, 200 mm. As the bunching yarn 61, for example, nylon yarn, polyester filament, cotton yarn or the like is used.

  Therefore, in the above optical fiber unit 59, during the construction of the intermediate post-branch, even if an extraordinary force is applied to the optical fiber unit 59 and the optical fiber 3 in the unit is scattered, the bunching yarn 61 disperses the optical fiber 3 Has the merit of avoiding. Moreover, since the twist pitch is 10 times the twist pitch of the bunching yarn of the conventional optical fiber unit, the intermediate post-branching operation can be performed without worrying about the bunching yarn 61 during the construction of the intermediate post-branch.

  Further, since the optical fiber unit 59 has a twist pitch equivalent to 10 times the twist pitch of the bunching yarn of the conventional optical fiber unit, the wrapping of the bunching yarn 61 is also produced when the optical cable 5 using the optical fiber unit 59 is manufactured. The process is not a factor that limits the line speed of the optical cable.

  The optical fiber unit 59 is housed in various optical cables such as the optical cable 5 and has the same functions and effects as the optical fiber unit 1 of the above-described embodiment, and detailed description thereof is omitted. .

  The optical fiber units 1 and 59 according to the embodiments of the present invention are particularly suitable for a slot-type optical fiber cable having less than 100 cores.

  In addition, this invention is not limited to embodiment mentioned above, It can implement in another aspect by making an appropriate change. In the embodiment described above, a plurality of optical fibers 3 of the optical fiber unit 1 are shown as vertical attachments in FIG. 1, but the present invention is also applicable to those twisted together.

(A) is a perspective view of the optical fiber unit of the embodiment of the present invention, (B) is a cross-sectional view showing an example of the vertical cross-sectional shape of (A), (C) is a vertical cross-sectional shape of (A) It is sectional drawing which shows other examples. (A)-(C) are schematic explanatory drawings of the apparatus which measures the tack value which shows the surface tack property of the optical fiber unit of embodiment of this invention. FIG. 3 is a partial perspective view of the apparatus shown in FIG. 2. It is sectional drawing of the slot type optical cable of embodiment of this invention. It is a schematic explanatory drawing at the time of intermediate post branching of the slot type optical cable. It is a schematic explanatory drawing of the manufacturing method of the optical cable of embodiment of this invention. It is a perspective view of the optical fiber unit of other embodiment of this invention. (A) is a perspective view of a conventional optical fiber unit, and (B) is a longitudinal sectional view of (A). It is sectional drawing of the conventional slot type optical cable.

Explanation of symbols

1 Optical fiber unit 3 Optical fiber 5 Optical cable (optical fiber cable)
7 Bare optical fiber 9 Coating resin (Coating material for optical fiber)
11 Test stand 13 Flat plate 15 Tag 17 Tensile tester 19 Tension member (strength member)
21 slot 23 slot groove 25 presser winding 27 cable core 29 cable sheath 31 optical cable manufacturing apparatus 35 optical fiber unit manufacturing apparatus 37 twisting apparatus 41 extruder 47 unit assembly plate 49 pressing roller 55 extrusion head 57 die 59 optical fiber unit 61 bunching yarn (Striatum)

Claims (10)

In an optical fiber unit formed by focusing a plurality of optical fibers housed in an optical fiber cable,
An optical fiber unit, wherein each of the optical fibers is constituted by an outermost layer covering material having surface tackiness, and the plurality of optical fibers are closely adhered to each other by the surface tackiness. In an optical fiber unit formed by focusing a plurality of optical fibers housed in an optical fiber cable,
Each optical fiber is composed of an outermost layer covering material having surface tackiness, and the plurality of optical fibers are brought into close contact with each other by the surface tackiness, and a wire is roughly wound around the outer periphery of the plurality of optical fibers. An optical fiber unit characterized by being configured as described above.   The optical fiber unit according to claim 1 or 2, wherein the optical fiber has a tack value quantitatively indicating the surface tackiness in a range of 0.5N to 1.2N. The optical fiber unit is configured by converging a plurality of optical fibers and includes a cable core containing one or a plurality of the optical fiber units, and a cable sheath covering the outer periphery of the cable core,
The optical fiber unit is configured by forming each optical fiber with an outermost coating material having surface tackiness, and forming the plurality of optical fibers in close contact with each other by the surface tackiness. Fiber optic cable. The optical fiber unit is configured by converging a plurality of optical fibers and includes a cable core containing one or a plurality of the optical fiber units, and a cable sheath covering the outer periphery of the cable core,
The optical fiber unit is configured such that each optical fiber is composed of a coating material of an outermost layer having surface tackiness, and the plurality of optical fibers are brought into close contact with each other by the surface tackiness and are disposed on the outer periphery of the plurality of optical fibers. An optical fiber cable, comprising a wire body roughly wound.   The optical fiber cable according to claim 4 or 5, wherein the optical fiber has a tack value quantitatively indicating the surface tackiness in a range of 0.5N to 1.2N.   5. The cable core includes a slot having a tensile body at a central portion and a slot groove at an outer peripheral portion, and one or a plurality of the optical fiber units are accommodated in the slot groove. 5, 5 or 6. A step of forming an optical fiber unit by closely attaching and converging a plurality of optical fibers provided with a coating material of an outermost layer having surface tackiness by the surface tackiness;
Supplying one or a plurality of the optical fiber units to the extrusion head;
Extruding a resin for a cable sheath to the extrusion head;
Extruding the outer periphery of the one or more optical fiber units so as to cover with a cable sheath;
An optical fiber cable manufacturing method comprising: A step of forming an optical fiber unit by closely attaching and converging a plurality of optical fibers provided with a coating material of an outermost layer having surface tackiness by the surface tackiness;
Storing one or a plurality of the optical fiber units in the slot groove of a slot having a tensile body at the center and a slot groove at the outer periphery, and forming a cable core;
Supplying the extrusion head by running the cable core;
Extruding a resin for a cable sheath to the extrusion head;
Extruding to cover the outer periphery of the cable core with a cable sheath;
An optical fiber cable manufacturing method comprising: The method of manufacturing an optical fiber cable according to claim 8 or 9, wherein, in the step of forming the optical fiber unit, a wire is roughly wound around an outer periphery of the plurality of optical fibers.

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