WO2021070466A1 - 光ファイバケーブルの製造方法および光ファイバケーブル - Google Patents
光ファイバケーブルの製造方法および光ファイバケーブル Download PDFInfo
- Publication number
- WO2021070466A1 WO2021070466A1 PCT/JP2020/030567 JP2020030567W WO2021070466A1 WO 2021070466 A1 WO2021070466 A1 WO 2021070466A1 JP 2020030567 W JP2020030567 W JP 2020030567W WO 2021070466 A1 WO2021070466 A1 WO 2021070466A1
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- WIPO (PCT)
- Prior art keywords
- optical fiber
- fiber cable
- overlapping portion
- resin
- core
- Prior art date
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 92
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 123
- 229920005989 resin Polymers 0.000 claims abstract description 79
- 239000011347 resin Substances 0.000 claims abstract description 79
- 238000001125 extrusion Methods 0.000 claims abstract description 23
- 238000004804 winding Methods 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims description 40
- 230000001070 adhesive effect Effects 0.000 claims description 40
- KAATUXNTWXVJKI-UHFFFAOYSA-N cypermethrin Chemical compound CC1(C)C(C=C(Cl)Cl)C1C(=O)OC(C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 KAATUXNTWXVJKI-UHFFFAOYSA-N 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 10
- 239000003063 flame retardant Substances 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 abstract description 6
- 239000002313 adhesive film Substances 0.000 description 46
- 239000010410 layer Substances 0.000 description 29
- 239000000463 material Substances 0.000 description 21
- 210000002445 nipple Anatomy 0.000 description 11
- 238000005336 cracking Methods 0.000 description 9
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- 238000000576 coating method Methods 0.000 description 8
- 239000000945 filler Substances 0.000 description 6
- 239000004698 Polyethylene Substances 0.000 description 5
- 239000005038 ethylene vinyl acetate Substances 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
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- 238000005452 bending Methods 0.000 description 4
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- -1 polyethylene Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004840 adhesive resin Substances 0.000 description 2
- 229920006223 adhesive resin Polymers 0.000 description 2
- 239000004760 aramid Substances 0.000 description 2
- 229920003235 aromatic polyamide Polymers 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
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- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
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- 238000009751 slip forming Methods 0.000 description 2
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- 239000012209 synthetic fiber Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
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- 229910052802 copper Inorganic materials 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
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- 239000012943 hotmelt Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4479—Manufacturing methods of optical cables
- G02B6/4486—Protective covering
- G02B6/4488—Protective covering using metallic tubes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/154—Coating solid articles, i.e. non-hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/156—Coating two or more articles simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
- G02B6/4433—Double reinforcement laying in straight line with optical transmission element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/4435—Corrugated mantle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
- B29K2105/0026—Flame proofing or flame retarding agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0097—Glues or adhesives, e.g. hot melts or thermofusible adhesives
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
- B29L2011/0075—Light guides, optical cables
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4431—Protective covering with provision in the protective covering, e.g. weak line, for gaining access to one or more fibres, e.g. for branching or tapping
Definitions
- the present invention relates to a method for manufacturing an optical fiber cable and an optical fiber cable.
- the present application claims priority with respect to Japanese Patent Application No. 2019-185963 filed in Japan on October 9, 2019, the contents of which are incorporated herein by reference.
- Patent Document 1 covers an optical fiber core wire, a reinforcing member arranged around the optical fiber core wire, a filler filled between the optical fiber core wire and the reinforcing member, and the outside of the reinforcing member.
- An optical cable with a sheath is disclosed.
- a strip-shaped material to be a reinforcing member is prepared, and adhesives are applied to both ends of the strip-shaped material.
- the optical fiber core wire is placed on the strip-shaped material, and the filler is filled on the strip-shaped material and the optical fiber core wire.
- both ends of the strip-shaped material overlap each other to form a reinforcing member.
- the reinforcing member is introduced into the extruder and passed through the extruder, so that the reinforcing member is coated with resin and a sheath is formed.
- the present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a method for manufacturing an optical fiber cable and an optical fiber cable capable of suppressing cracking of a sheath.
- the method for manufacturing an optical fiber cable includes a feeding step of sending out a core having a plurality of optical fibers, and a reinforcing member wound around the core to end the reinforcing member. It has a winding step of forming an overlapping portion in which the portions overlap in a part in the circumferential direction, and an extrusion molding step of extruding a sheath on the outside of the reinforcing member. In the extrusion molding step, at least the overlapping portion is formed. The resin constituting the sheath is partially inserted.
- the optical fiber cable according to the second aspect of the present invention includes a core having a plurality of optical fibers, a reinforcing member surrounding the core, and a sheath accommodating the core and the reinforcing member, and the reinforcing member.
- a core having a plurality of optical fibers a reinforcing member surrounding the core, and a sheath accommodating the core and the reinforcing member, and the reinforcing member.
- FIG. 3 is a cross-sectional view taken along the line III-III of FIG. It is a cross-sectional view before covering the outer sheath of the optical fiber cable of FIG. It is a cross-sectional view before covering the outer sheath of the optical fiber cable of FIG. It is a figure which shows the manufacturing method of the optical fiber cable which concerns on 1st Embodiment. It is sectional drawing of the optical fiber cable which concerns on 1st Embodiment.
- FIG. 1 shows the resistance force of the optical fiber cable manufactured by the manufacturing method of the optical fiber cable which concerns on 1st Embodiment. It is sectional drawing of the optical fiber cable which concerns on 2nd Embodiment. It is sectional drawing before covering the outer sheath of the optical fiber cable which concerns on 2nd Embodiment. It is sectional drawing before covering the outer sheath of the optical fiber cable which concerns on 2nd Embodiment.
- the optical fiber cable 1A includes an inner layer cable 10 having an optical fiber, a reinforcing unit (reinforcing member) 20, an outer sheath 30, and a pair of first ripcords 12.
- the longitudinal direction of the inner layer cable 10 is simply referred to as the longitudinal direction
- the central axis of the inner layer cable 10 is referred to as the central axis O.
- a cross section orthogonal to the central axis O is called a cross section.
- the direction that intersects the central axis O is called the radial direction
- the direction that orbits around the central axis O is called the circumferential direction.
- the inner layer cable 10 has a core 11 having a plurality of optical fibers, a pair of second ripcords 16, a pair of tensile strength bodies (tension members) 13, and an internal sheath 14.
- the inner layer cable 10 does not have to have the second ripcord 16.
- the core 11 extends in the longitudinal direction.
- the core 11 is formed by assembling a plurality of optical fibers.
- an optical fiber wire, an optical fiber core wire, an optical fiber tape core wire, or the like can be used.
- the plurality of optical fibers constituting the core 11 may be bundled by a binding material in a bundled state to form an optical fiber unit.
- a plurality of optical fibers are covered with a presser roll or a water-absorbing tape.
- the pair of second ripcords 16 are embedded in the inner sheath 14 so as to sandwich the core 11 in the radial direction in a cross-sectional view.
- the pair of second ripcords 16 extend in the longitudinal direction.
- the pair of second ripcords 16 are located on a straight line passing through the central axis O orthogonal to the neutral line L described later in the cross-sectional view.
- the pair of second ripcords 16 are in contact with the outer peripheral surface of the core 11.
- a string made of synthetic fibers such as polyester and aramid, a columnar rod made of PP or nylon, or the like can be used.
- the pair of tensile strength bodies 13 are embedded in the inner sheath 14 so as to sandwich the core 11 in the radial direction in a cross-sectional view. Each tensile strength body 13 extends in the longitudinal direction. Each tensile strength body 13 may be arranged parallel to the core 11 in the longitudinal direction, or may be arranged spirally around the core 11. The tensile strength body 13 has a role of protecting the optical fiber of the core 11 from the tension acting on the optical fiber cable 1A.
- the material of the tensile strength body 13 is, for example, a metal wire (steel wire or the like), a tensile strength fiber (aramid fiber or the like), FRP or the like.
- the tensile strength body 13 may be a single wire, or a plurality of strands may be bundled or twisted together.
- the straight line connecting the centers of the pair of tensile strength bodies 13 in the cross-sectional view is referred to as a neutral line L.
- the inner layer cable 10 may include three or more tensile strength bodies 13. When three or more tensile strength bodies 13 are arranged at equal intervals in the circumferential direction, the bending direction of the inner layer cable 10 becomes small, and the optical fiber cable 1A can be handled more easily.
- the inner sheath 14 collectively covers the core 11, the pair of tensile strength bodies 13, and the pair of second ripcords 16.
- a resin such as polyethylene (PE) or polyvinyl chloride (PVC) can be used.
- the inner sheath 14 is formed in a cylindrical shape extending in the longitudinal direction.
- the inner sheath 14 is formed by extrusion molding or the like.
- the outer sheath 30 houses an inner layer cable 10, a pair of first ripcords 12, and a reinforcing unit 20.
- the reinforcing unit 20 extends in the longitudinal direction and is formed in a tubular shape surrounding the inner layer cable 10.
- the reinforcing unit 20 has a first adhesive film 21 (adhesive layer), a second adhesive film 22, and a reinforcing sheet 23.
- the material of the reinforcing sheet 23 a metal such as iron, stainless steel, copper, or a copper alloy can be used.
- the material of the reinforcing sheet 23 can be changed as appropriate. It is desirable that the reinforcing sheet 23 is formed in a tape shape, for example, and is provided so that the length direction is aligned with the longitudinal direction of the inner layer cable 10.
- the thickness of the reinforcing sheet 23 is, for example, about 0.1 to 0.3 mm. By setting the thickness of the reinforcing sheet 23 within this range, it is possible to prevent the optical fiber of the core 11 from being damaged by the feeding damage of animals, and to facilitate the operation of tearing the reinforcing sheet 23 by the first ripcord 12. Can be done.
- the reinforcing unit 20 will be described by exemplifying a configuration including the first adhesive film 21 and the second adhesive film 22, but the reinforcing unit 20 may include at least the first adhesive film 21. Just do it.
- the second adhesive film 22 is provided in addition to the first adhesive film 21, it is possible to further strengthen the film adhesive force at the overlapping portion 20c (described later) and suppress rust on the reinforcing sheet 23.
- the reinforcing unit 20 surrounds the inner layer cable 10 over the entire circumference and is overlapped in a part in the circumferential direction.
- the portion where the first end portion 20a and the second end portion 20b in the circumferential direction of the reinforcing unit 20 are overlapped is referred to as an overlapping portion 20c.
- the first end portion 20a and the second end portion 20b face each other in the radial direction.
- the entire overlapping portion 20c and the tensile strength body 13 are arranged at different positions in the circumferential direction.
- the first adhesive film 21 is attached to the surface of the reinforcing sheet 23 facing the outer sheath 30.
- the second adhesive film 22 is attached to the surface of the reinforcing sheet 23 facing the inner layer cable 10.
- a thermosetting type adhesive or a hot melt type adhesive can be used as the adhesive used for the first adhesive film 21 and the second adhesive film 22.
- the material of the adhesive may be changed as appropriate.
- the first adhesive film 21 has a role of fixing the outer sheath 30 to the reinforcing sheet 23.
- the second adhesive film 22 may have a role of fixing the first ripcord 12 to the reinforcing sheet 23 together with the coating 12a of the first ripcord 12, which will be described later.
- the portion of the overlapping portion 20c located between the reinforcing sheets 23 has a role of fixing the ends of the reinforcing sheets 23 to each other at the overlapping portion 20c. ing.
- the reinforcing unit 20 has a corrugated shape in which mountain portions 24 that are convex outward in the radial direction and valley portions 25 that are convex inward in the radial direction are alternately formed along the longitudinal direction. ..
- the mountain portion 24a of the first end portion 20a and the mountain portion 24b of the second end portion 20b are arranged so as to face each other in the radial direction, and the valley portion 25a and the second end portion 20b of the first end portion 20a are arranged.
- the valley portion 25b of the above is arranged so as to face each other in the radial direction.
- the bonding state between the first end portion 20a and the second end portion 20b by the first adhesive film 21 and the second adhesive film 22 may not be uniform in the longitudinal direction.
- the state in which the first end portion 20a and the second end portion 20b are adhered by the adhesive films 21 and 22 with a predetermined film adhesive force or more is referred to as a state S1
- the state in which the film is adhered with a small adhesive force is referred to as a state S2.
- a gap 26 is formed between the first end portion 20a and the second end portion 20b.
- the "predetermined film adhesive force” is a force that sufficiently strongly adheres the first end portion 20a and the second end portion 20b by the adhesive films 21 and 22.
- a part in the longitudinal direction is in the state S1, and the other part is in the state S2.
- a gap 26a is formed between the mountain portion 24a and the mountain portion 24b, and a gap 26b is formed between the valley portion 25a and the valley portion 25b.
- the gap 26 may or may not be continuously formed in the longitudinal direction.
- the resin 30a constituting the outer sheath 30 is inserted in the gap 26 between the first end portion 20a and the second end portion 20b. That is, the outer sheath 30 and the resin 30a that has entered the gap 26 are integrally formed.
- a resin is formed in the gap 26a between the first end 20a and the second end 20b in the mountain portion 24 and in the gap 26b between the first end 20a and the second end 20b in the valley 25, respectively.
- 30a is in it.
- the radial dimension M2 of the resin 30a between the valleys 25a and 25b is thicker than the radial dimension M1 of the resin 30a between the peaks 24a and 24b.
- the width of the resin 30a entering the gap 26 in the circumferential direction is W1 and the width of the overlapping portion 20c in the circumferential direction is W2, the resin width with respect to the overlap width W2.
- the ratio W1 / W2 of W1 is 0.10 or more.
- the value of W1 / W2 is not particularly limited, but by setting it to 0.10 or more, it is possible to reliably bond the first end portion 20a and the second end portion 20b with the resin 30a.
- the outer sheath 30 is formed in a tubular shape extending in the longitudinal direction, and is inserted into the gap 26 as described above.
- a resin such as polyethylene (PE) or polyvinyl chloride (PVC) can be used.
- the outer sheath 30 of the present embodiment is made of a flame-retardant resin ((EVA: Ethylene Vinyl Acetate), elastomer, etc.) containing a large amount of flame-retardant filler.
- EVA Ethylene Vinyl Acetate
- the pair of first ripcords 12 extend in the longitudinal direction and are arranged between the inner layer cable 10 and the reinforcing unit 20.
- the pair of first ripcords 12 are in contact with the outer peripheral surface of the inner sheath 14.
- the pair of first ripcords 12 are in contact with the inner peripheral surface of the reinforcing unit 20, that is, the inner surface of the second adhesive film 22.
- the pair of first ripcords 12 are located on the neutral line L in the cross-sectional view.
- a string obtained by twisting synthetic fibers such as polyester and aramid can be used.
- the optical fiber cable 1A does not have to have the first ripcord 12.
- a coating 12a formed of an adhesive resin is provided around the first ripcord 12.
- the material of the coating 12a is a polyolefin-based material such as polyethylene or a copolymer thereof (for example, EVA), a thermoplastic resin such as polyester-based, polyurethane-based, or polyamide-based, or a resin having adhesiveness such as a thermosetting resin, or Synthetic rubber or the like can be used.
- EVA polyethylene or a copolymer thereof
- a thermoplastic resin such as polyester-based, polyurethane-based, or polyamide-based
- a resin having adhesiveness such as a thermosetting resin, or Synthetic rubber or the like
- each of the above materials can be used independently, and two or more of the above materials can be mixed or mixed in order to adjust the adhesiveness, tackiness, temperature at the time of heat fusion, and the like. It may be modified to introduce a functional group.
- a resin containing a functional group is used as the material of the coating 12a in order to ensure the adhesiveness between the first ripcord 12 and the reinforcing sheet 23. Is preferable.
- the coating 12a can be formed by applying these adhesive resins to the outer periphery of the first ripcord 12.
- the first ripcord 12 is used when tearing the reinforcing sheet 23 and the outer sheath 30 (hereinafter, simply referred to as tearing work).
- the first ripcord 12 is required to have a mechanical strength (for example, tensile strength) sufficient to tear the reinforcing sheet 23 and the outer sheath 30.
- the first ripcord 12 is arranged at a position different from that of the overlapping portion 20c of the reinforcing unit 20 in the circumferential direction in the cross-sectional view.
- the thickness of the overlapping portion 20c in the radial direction is thick, so that the reinforcing unit by the first ripcord 12 is used.
- the operation of tearing 20 becomes difficult.
- the first ripcord 12 is arranged at a position different from that of the overlapping portion 20c of the reinforcing unit 20 in the circumferential direction, the operability of tearing the reinforcing unit 20 can be improved.
- the side edge 23a in the overlapping portion 20c and the first ripcord 12 are arranged at different positions in the circumferential direction in the cross-sectional view. As a result, when the reinforcing unit 20 is torn, the first ripcord 12 is cut off at the side edge 23a of the overlapping portion 20c, and it is possible to prevent the work of tearing the reinforcing unit 20 from being hindered.
- the inner layer cable 10 is prepared.
- the inner layer cable 10 is obtained, for example, by feeding out the core 11 and the pair of tensile strength bodies 13 and covering the core 11 and the pair of tensile strength bodies 13 with the inner sheath 14 (feeding step).
- the inner layer cable 10 may be prepared in a separate process, or may be prepared in tandem with the subsequent process.
- a reinforcing unit 20 in which the first adhesive film 21 and the second adhesive film 22 are attached to the flat plate-shaped reinforcing sheet 23 is prepared.
- the flat plate-shaped reinforcing unit 20 is processed to form the peak portion 24 and the valley portion 25.
- the order of the steps of attaching the first adhesive film 21 and the second adhesive film 22 to the reinforcing sheet 23 is not limited to this, and may be changed as appropriate.
- two first ripcords 12 are vertically attached to the reinforcing unit 20. At this time, the two first ripcords 12 are arranged substantially parallel to each other, and a predetermined distance is provided between the first ripcords 12.
- the reinforcing unit 20 is wound around the inner layer cable 10 so that the first end portion 20a and the second end portion 20b of the reinforcing unit 20 form an overlapping portion 20c that partially overlaps in the circumferential direction (winding step). ).
- the first end portion 20a and the second end portion 20b are temporarily fixed by the first adhesive film 21 and the second adhesive film 22, and the reinforcing unit 20 has a tubular shape that surrounds the inner layer cable 10 and extends in the longitudinal direction.
- the peaks 24 and the valleys 25 of the first end 20a and the second end 20b are opposed to each other in the radial direction.
- the reinforcing unit 20 is pressed so that the first end portion 20a and the second end portion 20b are brought close to each other by the rollers (rotating body, not shown) arranged so as to face each other.
- the overlapping portion 20c of the reinforcing unit 20 has a state S1 in which the reinforcing unit 20 is bonded with a film adhesive force equal to or higher than a predetermined film, and a state S2 in which the reinforcing unit 20 is bonded with a film adhesive force less than the predetermined film adhesive force. ing.
- the state S2 that does not meet the predetermined film adhesive force includes, for example, the state S2a shown in FIG. 4 and the state S2b shown in FIG.
- the first end portion 20a and the second end portion 20b are partially in contact with each other to form a gap 26.
- the state S2b shown in FIG. 5 the first end portion 20a and the second end portion 20b do not come into contact with each other, and a gap 26 is formed in the entire circumferential direction of the overlapping portion 20c.
- the extrusion covering device 40 includes a nipple 41 through which an inner layer cable 10 surrounded by a reinforcing unit 20 is inserted, and a die 42 provided substantially coaxially on the outside of the nipple 41.
- the inner layer cable 10 surrounded by the reinforcing unit 20 is inserted into the insertion hole 43 of the nipple 41, and the flame-retardant resin melted from the resin flow path 45 is placed on the outer circumference of the reinforcing unit 20 coming out from the outlet 44 of the nipple 41.
- 30a is extruded and covered.
- the resin pressure in the extrusion molding step is a pressure obtained in advance so that the ratio W1 / W2 of the resin width W1 to the overlapping width W2 is 0.10 or more.
- the resin pressure can be adjusted, for example, by changing the distance N between the tip 41a of the nipple 41 and the tip 42a of the die 42. Therefore, the distance N such that W1 / W2 is 0.10 or more is calculated in advance by an experiment before the start of production.
- the resin pressure may be adjusted by other means. Other means include, for example, the shape of the die 42 and the nipple 41, the inner diameter of the resin flow path 45, the amount of the resin 30a discharged from the extrusion covering device 40, the setting of the temperature, and the like.
- the reinforcing unit 20 is covered with the resin 30a with the nipple 41 and the die 42 installed so that the distance between the nipple 41 and the die 42 is the distance N calculated in advance.
- the outer sheath 30 By extruding the outer sheath 30 in this way, the inner layer cable 10 and the reinforcing unit 20 are housed in the outer sheath 30.
- the resin is attached to the portion of the overlapping portion 20c where the first end portion 20a and the second end portion 20b are adhered with a film adhesive force less than a predetermined film adhesive force (the portion in the state S2).
- the optical fiber cable 1A shown in FIG. 2 is manufactured.
- the resin 30a does not enter the portion.
- FIG. 8 is a conceptual diagram showing the result of covering the reinforcing unit 20 with the resin pressure calculated in advance.
- the overlapping portion 20c is provided with a holding force for suppressing the first end portion 20a by the outer sheath 30 in addition to the film adhesive force.
- the outer sheath 30 provided on the outer peripheral side of the reinforcing unit 20 and the resin 30a entering the gap 26 are continuously formed.
- the force of the first end portion 20a toward the outer peripheral side of the optical fiber cable 1A is suppressed.
- the resistance force against the force that the overlapping portion 20c tries to open when the optical fiber cable 1A is bent is the film adhesive force of the adhesive films 21 and 22 and the restraining force of the resin 30a. It becomes a sum.
- the vertical axis of FIG. 8 is the resistance force
- the horizontal axis is the above-mentioned states S1, state S2a, and state S2b.
- the broken line indicates the film adhesive force before coating the outer sheath 30, and the solid line indicates the resistance force after coating the outer sheath 30 (that is, the sum of the film adhesive force and the holding force by the resin 30a).
- the “predetermined resistance force” in FIG. 8 is a threshold value of a force for suppressing the overlapping portion 20c from opening and cracking the outer sheath 30 when the optical fiber cable 1A is bent.
- the film adhesive force exceeds a predetermined resistance force. That is, in the state S1, the first end portion 20a and the second end portion 20b are sufficiently strongly adhered by the film adhesive force of the adhesive films 21 and 22.
- the film adhesive force becomes zero.
- the resin 30a of the outer sheath 30 enters between the first end portion 20a and the second end portion 20b and enters the overlapping portion 20c. Is given restraining power. In this way, the resin 30a exerts a suppressing force, so that the resistance force is increased to exceed a predetermined resistance force at the portion of the state S2b.
- the method for manufacturing the optical fiber cable 1A of the present embodiment includes a delivery step of sending out the core 11 as an inner layer cable 10 having a plurality of optical fibers, and winding the reinforcing unit (reinforcing member) 20 around the core 11.
- a winding step of forming an overlapping portion 20c in which the ends 20a and 20b of the reinforcing unit 20 overlap each other in a part in the circumferential direction, and an extrusion molding step of extruding an outer sheath 30 on the outside of the reinforcing unit 20. have.
- the resin 30a constituting the outer sheath 30 is inserted into at least a part of the overlapping portion 20c.
- the restraining force is imparted by inserting the resin 30a constituting the outer sheath 30 into the portion of the overlapping portion 20c in the state S2 which is less than the predetermined film adhesive force, and the portion concerned.
- the resistance of the film can be increased.
- the resistance of the overlapping portion 20c in the longitudinal direction can be increased to a predetermined resistance or higher, so that the phenomenon that the overlapping portion 20c opens when the optical fiber cable 1A is bent can be suppressed. Therefore, it is possible to prevent the outer sheath 30 from cracking.
- the reinforcing unit 20 has a corrugated shape in which mountain portions 24 which are convex outward in the radial direction and valley portions 25 which are convex inward in the radial direction are alternately formed along the longitudinal direction, and the overlapping portion 20c.
- the mountain portions 24 are arranged so as to face each other in the radial direction
- the valley portions 25 are arranged so as to face each other in the radial direction.
- the resin 30a constituting the outer sheath 30 is formed of a flame-retardant resin.
- a filler having a relatively low melting point and softening temperature is added to the resin 30a, it may be a problem that the strength of the optical fiber cable 1A in a high temperature environment is lowered.
- the resin is a flame-retardant resin, when the optical fiber cable is bent in a high temperature environment, the overlapping portion 20c opens and distortion (cracking) occurs.
- the resin 30a constituting the outer sheath 30 is contained in the overlapping portion 20c of the reinforcing unit 20, the overlapping portion 20c is opened even in a high temperature environment. The force to try can be suppressed. Therefore, even if the resin 30a is a flame-retardant resin, cracking of the outer sheath 30 can be suppressed.
- the structure in which the reinforcing unit 20 includes the first adhesive film 21 and the second adhesive film 22 has been described as an example, but at least the first adhesive film 21 may be provided. Due to the absence of the second adhesive film 22, even if a portion having a low film adhesive strength appears, the portion having a weak film adhesive strength is given a restraining force by the resin 30a to increase the resistance. Therefore, it is possible to reduce the cost by omitting the second adhesive film 22.
- the entire overlapping portion 20c and the tensile strength body 13 are arranged at different positions in the circumferential direction in the cross-sectional view, but the entire overlapping portion 20c and the tensile strength body 13 are located at the same position in the circumferential direction. It may be arranged.
- the first adhesive film 21 is used to attach the first end portion 20a to the first end portion 20a in the winding step.
- the second end portion 20b is temporarily fixed. Even if the adhesive strength of the first adhesive film 21 is insufficient, the resin 30a enters the portion where the film adhesive force is weak, so that the resistance force in the longitudinal direction can be increased to a predetermined resistance force or more.
- an adhesive is provided only on the overlapping portion 20c to provide the first adhesive.
- the end portion 20a and the second end portion 20b may be temporarily fixed.
- the optical fiber cable 1B of the present embodiment is different from the first embodiment in that the reinforcing unit 20A does not include the first adhesive film 21 and the second adhesive film 22. That is, the reinforcing unit (reinforcing member) 20A of the present embodiment corresponds to the reinforcing sheet 23 of the first embodiment.
- the reinforcing unit 20A does not include the first adhesive film 21 and the second adhesive film 22, when the reinforcing unit 20A having the peaks 24 and the valleys 25 is wound around the inner layer cable 10, they overlap each other.
- the portion 20c is not fixed or temporarily fixed, and the reinforcing unit 20A has a tubular shape that surrounds the inner layer cable 10 and extends in the longitudinal direction.
- the overlapping portion 20c of the reinforcing unit 20A is in a state where the first end portion 20a and the second end portion 20b are in contact with each other without a gap in the cross-sectional view, as shown in FIG.
- the first end 20a and the second end 20b are partially in contact with each other to form a gap 26, and as shown in FIG. 11, the first end 20a and the second end 20b are in contact with each other. There may be a state S3c in which the gap 26 is formed without contact.
- the outer sheath 30 is extruded using the extrusion covering device 40 as in the first embodiment so as to cover the reinforcing unit 20A.
- the relationship between the resin pressure and the adhesive strength is obtained in advance, and the distance N is calculated so that the value of W1 / W2 is 0.10 or more as in the first embodiment.
- the reinforcing unit 20A is covered with the resin 30a so that the distance between the nipple 41 and the die 42 is N.
- the resin pressure is kept substantially uniform.
- the resin 30a evenly enters the overlapping portion 20c over the longitudinal direction. In this way, the resin 30a enters the gap 26 in the state S3b shown in FIG. 10, and the resin 30a enters the gap 26 in the state S3c shown in FIG.
- the space between the first end portion 20a and the second end portion 20b is expanded by the resin pressure, and the resin 30a enters the gap.
- the outer sheath 30 in which the resin 30a is inserted is formed in the overlapping portion 20c, and the optical fiber cable 1B is manufactured.
- the reinforcing unit 20A does not include the first adhesive film 21 and the second adhesive film 22, the holding force of the first end portion 20a by the outer sheath 30 overlaps when the optical fiber cable 1A is bent. It becomes a resistance force against the force that the portion 20c tries to open.
- the resistance is increased to a predetermined resistance or more, similarly to the optical fiber cable 1A of the first embodiment.
- the feeding process of feeding out the core 11 having a plurality of optical fibers and the reinforcing unit (reinforcing member) 20A are wound around the core 11 to reinforce the core 11A. It has a winding step of forming an overlapping portion 20c in which the end portions 20a and 20b of the above overlap in a part in the circumferential direction, and an extrusion molding step of extruding an outer sheath 30 on the outside of the reinforcing unit 20A. There is. Then, in the extrusion molding step, the resin 30a constituting the outer sheath 30 is inserted into the overlapping portion 20c.
- the resistance of the overlapping portion 20c in the longitudinal direction can be increased to a predetermined resistance or higher, so that the overlapping portion 20c opens when the optical fiber cable 1B is bent.
- the phenomenon can be suppressed. Therefore, it is possible to prevent the outer sheath 30 from cracking.
- the optical fiber cable 1A manufactured by using the manufacturing method according to the first embodiment described above was evaluated.
- the outer diameter of the inner layer cable 10 is 14.6 mm
- the circumferential length of the reinforcing unit 20 is 64 mm
- the width W2 of the overlapping portion 20c of the reinforcing unit 20 in the circumferential direction is 10 mm
- the outer diameter of the optical fiber cable 1A. Is 22.1 mm.
- EVA was used as the material of the outer sheath 30.
- a filler such as a metal hydroxide (aluminum hydroxide or magnesium hydroxide) or a phosphorus-based flame retardant is added.
- a base resin containing a soft EVA, EEA (ethylene ethyl acrylate copolymer), and an elastomer having a relatively low melting point and softening temperature can be used.
- the resin pressure in the extrusion molding step is preferably a pressure obtained in advance so as to satisfy W1 / W2 ⁇ 0.10.
- the reinforcing unit 20 has been described as having a state S1, a state S2a, and a state S2b, but it is not necessary to include all of these states. .. That is, if the reinforcing unit 20 includes at least one of the states S2a and S2b, the cracking of the outer sheath 30 can be suppressed, and the suppressing force is suppressed in the portion where the film adhesive force is weak in the longitudinal direction. Is given, and the resistance is increased, so that the effect that the reliability of the optical fiber cable 1A can be improved can be obtained.
- the reinforcing unit 20 does not have to include all the states of the state S3a, the state S3b, and the state S3c, and at least one of the states S3a, the state S3b, and the state S3c. It suffices to include one state.
- the reinforcing unit 20 is corrugated. May not be applied.
- the corrugated shape of the reinforcing unit 20 is not limited to the above-described configuration.
- the corrugated shape may have a structure in which peaks 24 and valleys 25 extending diagonally with respect to the longitudinal direction are alternately formed in the longitudinal direction.
- the reinforcing unit 20 surrounds the inner layer cable 10, but the present invention is not limited to this, and the reinforcing unit 20 may surround the core 11.
- the winding step is performed after forming the peak portion 24 and the valley portion 25 of the reinforcing unit 20 (20A), but the flat sheet-shaped reinforcing unit 20 ( After performing the winding step using 20A), the peak portion 24 and the valley portion 25 may be formed before the extrusion molding step.
- the radial dimension M2 of the resin 30a between the valley portion 25a and the valley portion 25b is the radial dimension M2 of the resin 30a between the mountain portion 24a and the mountain portion 24b. It is assumed to be thicker than the dimension M1, but the present invention is not limited to this. That is, the configuration may be such that the dimension M2 is thinner than the dimension M1 or the thickness of the resin 30a is uniform between the peaks 24 and the valleys 25.
- the resin 30a may enter at least between the valley portion 25a and the valley portion 25b between the first end portion 20a and the second end portion 20b of the overlapping portion 20c.
- the inner layer cable 10 is not limited to the above-described configuration, and may be a loose tube, a wrapping tube cable (WTC), or a slot type. Further, a tensile strength body may be embedded in the outer sheath 30. Further, the plurality of optical fibers and the inner layer cable 10 may or may not be covered with a presser roll or a water absorbing tape (sheet), if necessary. Further, not limited to the water absorbing tape (sheet), other waterproofing material or water absorbing material may or may not be provided as needed. Further, in each of the above embodiments, the cross-sectional shape of the core 11 is circular, but the cross-sectional shape of the core 11 may be elliptical or rectangular.
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Abstract
Description
本願は、2019年10月9日に日本に出願された特願2019-185963号について優先権を主張し、その内容をここに援用する。
この光ケーブルの製造方法は、まず、補強部材となる帯状材料を用意し、帯状材料の両端部に接着剤を塗布する。次に、帯状材料上に光ファイバ心線を配置し、帯状材料および光ファイバ心線上に充填剤を充填する。次いで、フォーマーに帯状材料および光ファイバ心線を通過させることによって、帯状材料の両端部が重なり合い、補強部材が形成される。そして、補強部材を押出形成機に導入し、通過させることによって補強部材に樹脂が被覆されシースが形成される。
以下、第1実施形態に係る光ファイバケーブルの構成を、図1~図8を参照しながら説明する。
図1に示すように、光ファイバケーブル1Aは、光ファイバを有する内層ケーブル10と、補強ユニット(補強部材)20と、外部シース30と、一対の第1リップコード12と、を備えている。
ここで本実施形態では、内層ケーブル10の長手方向を単に長手方向といい、内層ケーブル10の中心軸線を中心軸線Oという。また、中心軸線Oに直交する断面を横断面という。横断面視で、中心軸線Oに交差する方向を径方向といい、中心軸線O回りに周回する方向を周方向という。
コア11は、長手方向に延びている。コア11は、複数本の光ファイバを集合することで構成されている。コア11を構成する光ファイバとしては、光ファイバ素線、光ファイバ心線、光ファイバテープ心線などを用いることができる。コア11を構成する複数の光ファイバは、例えば、束ねられた状態で、結束材によって結束され、光ファイバユニットを構成していてもよい。複数の光ファイバは、押さえ巻きや吸水テープで覆われている。
抗張力体13は、光ファイバケーブル1Aに作用する張力から、コア11の光ファイバを保護する役割を有している。抗張力体13の材質は、例えば、金属線(鋼線等)、抗張力繊維(アラミド繊維等)、FRPなどである。抗張力体13は単線であってもよく、複数の素線を束ねたり互いに撚り合わせたりしたものであってもよい。
内層ケーブル10には3本以上の抗張力体13が含まれていてもよい。3本以上の抗張力体13を周方向で等間隔に配置した場合、内層ケーブル10の曲げの方向性が小さくなり、光ファイバケーブル1Aをより取扱いやすくすることができる。
補強ユニット20は、長手方向に延びており、内層ケーブル10を囲繞する筒状に形成されている。補強ユニット20は、第1接着フィルム21(接着層)と、第2接着フィルム22と、補強シート23と、を有している。
本実施形態では、横断面視において、重なり部20cの全体と抗張力体13とが周方向において異なる位置に配置されている。
図3の例では、長手方向の一部が状態S1となっており、その他の部分が状態S2となっている。状態S2では、山部24aと山部24bとの間に隙間26aが形成され、谷部25aと谷部25bとの間に隙間26bが形成されている。隙間26は、長手方向において連続的に形成されている場合もあり、連続的に形成されていない場合もある。
谷部25aと谷部25bとの間の樹脂30aの径方向における寸法M2は、山部24aと山部24bとの間の樹脂30aの径方向における寸法M1よりも厚い。
次に、本実施形態における光ファイバケーブル1Aの製造方法について説明する。
次に、平板状の補強シート23に第1接着フィルム21および第2接着フィルム22が貼り付けられた補強ユニット20を用意する。そして、平板状の補強ユニット20を加工して山部24および谷部25を形成する。第1接着フィルム21および第2接着フィルム22を補強シート23に貼り付ける工程の順序はこれに限定されず、適宜変更してもよい。
次に、補強ユニット20に2本の第1リップコード12を縦添えする。このとき、2本の第1リップコード12は、互いに略平行に配置されるとともに、第1リップコード12同士の間には所定の間隔が設けられている。
次に、対向して配置されたコロ(回転体、図示略)により、第1端部20aと第2端部20bとを近づけるように、補強ユニット20を押圧する。
このとき、補強ユニット20の重なり部20cには、所定のフィルム接着力以上で接着されている状態S1と、所定のフィルム接着力に満たないフィルム接着力で接着されている状態S2とが存在している。
押出被覆装置40は、補強ユニット20により囲繞された内層ケーブル10が挿通されるニップル41と、ニップル41の外側にほぼ同軸上に設けられたダイス42とを備えている。補強ユニット20により囲繞された内層ケーブル10をニップル41の挿通孔43に挿通し、ニップル41の出口44から出てくる補強ユニット20の外周上に、樹脂流路45から溶融した難燃性の樹脂30aを押し出して被覆する。
重なり部20cのうち、第1端部20aと第2端部20bとが隙間なく密着しており、接着フィルム21、22によって所定のフィルム接着力で接着されている部分(状態S1の部分)がある場合、当該部分には樹脂30aが入り込まない。つまり、押出成形工程における樹脂圧が一定であっても、接着フィルム21、22による第1端部20aと第2端部20bとの接着状態の違いによって、樹脂30aが入り込む部分と入り込まない部分とが生じうる。
状態S1では、図8の実線で示すように、フィルム接着力が、所定の抵抗力を超えている。つまり、状態S1では、接着フィルム21、22によるフィルム接着力によって、第1端部20aと第2端部20bとが充分に強く接着されている。
また、横断面視において、重なり部20cの全体と抗張力体13とが周方向において異なる位置に配置されていると説明したが、重なり部20cの全体と抗張力体13とが周方向において同じ位置に配置されていてもよい。
次に、本発明に係る第2実施形態について説明するが、第1実施形態と基本的な構成は同様である。このため、同様の構成には同一の符号を付してその説明は省略し、異なる点についてのみ説明する。
本実施形態の光ファイバケーブル1Bでは、図9に示すように、補強ユニット20Aが第1接着フィルム21および第2接着フィルム22を備えていない点において第1実施形態と異なる。すなわち、本実施形態の補強ユニット(補強部材)20Aは、第1実施形態における補強シート23に対応している。
本実施形態では、補強ユニット20Aが第1接着フィルム21および第2接着フィルム22を備えていないため、内層ケーブル10に対して山部24および谷部25を有する補強ユニット20Aを巻き付けた際、重なり部20cは固定、または、仮固定されず、補強ユニット20Aは内層ケーブル10を囲繞して長手方向に延びる筒状となる。
このとき、補強ユニット20Aの重なり部20cは、横断面視において、第1端部20aと第2端部20bとが隙間なく接触している状態S3a(図示略)と、図10に示すように、第1端部20aと第2端部20bとが一部接触し、隙間26が形成されている状態S3bと、図11に示すように、第1端部20aと第2端部20bとが接触せずに隙間26が形成されている状態S3cと、が存在し得る。
このとき、予め樹脂圧と接着強度との関係を求めておき、W1/W2の値が、第1実施形態と同様に、0.10以上となるように、距離Nを算出しておく。
内層ケーブル10の外径が14.6mmであり、補強ユニット20の周方向の長さが64mm、補強ユニット20の重なり部20cの周方向における幅W2が10mmであり、光ファイバケーブル1Aの外径が22.1mmである。外部シース30の材料としてはEVAを用いた。難燃剤として、例えば金属水酸化物(水酸化アルミニウムや水酸化マグネシウム)やリン系難燃剤などのフィラーが添加されている。難燃剤のようなフィラーを添加するために、融点や軟化温度が比較的低く、柔らかいEVA、EEA(エチレンエチルアクリレート共重合体)、エラストマを配合したベース樹脂を用いることができる。
試験結果を表1に示す。
この結果に基づき、押出成形工程における樹脂圧は、W1/W2≧0.10を満足するように、予め求めた圧力とすることが好ましい。
また、前記第1、第2実施形態の製造方法では、補強ユニット20(20A)の山部24および谷部25を形成した後で巻き付け工程を行ったが、平坦なシート状の補強ユニット20(20A)を用いて巻き付け工程を行った後、押出成形工程の前に、山部24および谷部25を形成してもよい。
また、上記各実施形態では、コア11の横断面形状が円形であったが、コア11の横断面形状は楕円形や矩形などであってもよい。
Claims (11)
- 複数の光ファイバを有するコアを送り出す送り出し工程と、
補強部材を前記コアに巻き付け、前記補強部材の端部同士が周方向の一部で重なる重なり部を形成する巻き付け工程と、
前記補強部材の外側にシースを押出成形する押出成形工程と、を有し、
前記押出成形工程において、前記重なり部の少なくとも一部に前記シースを構成する樹脂を入り込ませる、光ファイバケーブルの製造方法。 - 前記重なり部の周方向における幅をW2とし、前記重なり部に入り込んでいる前記樹脂の周方向における幅をW1とするとき、W1/W2≧0.10を満足する、請求項1に記載の光ファイバケーブルの製造方法。
- 前記押出成形工程における樹脂圧は、W1/W2≧0.10を満足するように、予め求めた圧力とする、請求項2に記載の光ファイバケーブルの製造方法。
- 前記巻き付け工程において、前記重なり部を接着剤によって仮固定する、請求項1から請求項3のいずれか1項に記載の光ファイバケーブルの製造方法。
- 複数の光ファイバを有するコアと、
前記コアを囲繞する補強部材と、
前記コアと前記補強部材とを収容するシースと、を備え、
前記補強部材は、端部同士が周方向の一部で重ねられた重なり部を有し、前記シースを構成する樹脂が前記重なり部の少なくとも一部に入り込んでいる、光ファイバケーブル。 - 前記補強部材は、径方向外側に凸となる山部と、径方向内側に凸となる谷部とが、長手方向に沿って交互に形成されたコルゲート形状であり、
前記重なり部において、前記山部同士が径方向に対向して配置され、前記谷部同士が径方向に対向して配置されている、請求項5に記載の光ファイバケーブル。 - 少なくとも前記重なり部の前記谷部同士の間に前記樹脂が入り込んでいる、請求項6に記載の光ファイバケーブル。
- 前記シースが難燃性樹脂で形成されている、請求項5から請求項7のいずれか1項に記載の光ファイバケーブル。
- 前記重なり部の周方向における幅をW2とし、前記重なり部に入り込んでいる前記樹脂の周方向における幅をW1とするとき、W1/W2≧0.10を満足する、請求項5から請求項8のいずれか1項に記載の光ファイバケーブル。
- 前記コアと前記補強部材との間に配置されたリップコードをさらに備え、
横断面視において、前記リップコードは、前記重なり部と周方向で異なる位置に配置されている、請求項5から請求項9のいずれか1項に記載の光ファイバケーブル。 - 前記補強部材のうち前記シースを向く面に接着層が形成されている、請求項5から請求項10のいずれか1項に記載の光ファイバケーブル。
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