WO2004055835A1 - 通信ケーブル及び通信線用保護管 - Google Patents
通信ケーブル及び通信線用保護管 Download PDFInfo
- Publication number
- WO2004055835A1 WO2004055835A1 PCT/JP2003/016041 JP0316041W WO2004055835A1 WO 2004055835 A1 WO2004055835 A1 WO 2004055835A1 JP 0316041 W JP0316041 W JP 0316041W WO 2004055835 A1 WO2004055835 A1 WO 2004055835A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- resin layer
- communication line
- layer
- tube
- communication
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 200
- 230000001681 protective effect Effects 0.000 title claims abstract description 19
- 229920005989 resin Polymers 0.000 claims abstract description 319
- 239000011347 resin Substances 0.000 claims abstract description 319
- 239000010410 layer Substances 0.000 claims abstract description 303
- 238000005452 bending Methods 0.000 claims abstract description 100
- 239000011241 protective layer Substances 0.000 claims abstract description 67
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 25
- 239000000057 synthetic resin Substances 0.000 claims abstract description 25
- 239000013307 optical fiber Substances 0.000 claims description 84
- 239000000835 fiber Substances 0.000 claims description 78
- 239000011247 coating layer Substances 0.000 claims description 30
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 11
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000000945 filler Substances 0.000 claims description 7
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 43
- 229920005992 thermoplastic resin Polymers 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 15
- 238000000576 coating method Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 12
- 239000004020 conductor Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 9
- 238000012545 processing Methods 0.000 description 9
- 239000003365 glass fiber Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 5
- 230000002265 prevention Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 229920000049 Carbon (fiber) Polymers 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000004917 carbon fiber Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- -1 polypropylene Polymers 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 210000004177 elastic tissue Anatomy 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 229920005668 polycarbonate resin Polymers 0.000 description 3
- 239000004431 polycarbonate resin Substances 0.000 description 3
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 2
- 229920000299 Nylon 12 Polymers 0.000 description 2
- 229920002292 Nylon 6 Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 2
- 229920006231 aramid fiber Polymers 0.000 description 2
- 238000009954 braiding Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920013716 polyethylene resin Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- VFWCMGCRMGJXDK-UHFFFAOYSA-N 1-chlorobutane Chemical compound CCCCCl VFWCMGCRMGJXDK-UHFFFAOYSA-N 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229920000508 Vectran Polymers 0.000 description 1
- 239000004979 Vectran Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000009751 slip forming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- G02B6/4439—Auxiliary devices
- G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
- G02B6/4461—Articulated
-
- 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
- G02B6/4439—Auxiliary devices
- G02B6/4471—Terminating devices ; Cable clamps
- G02B6/4478—Bending relief means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
- H02G3/0462—Tubings, i.e. having a closed section
- H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
Definitions
- the present invention relates to a communication cable in which a communication line such as an optical fiber or a twisted conductor is protected in a loose state or in close contact with a synthetic resin jacket, and more particularly to a communication cable used for indoor wiring and a brightness protection tube into which the communication line is inserted.
- Communication cables are used for transmitting and controlling various types of information in vehicles, communication devices, and indoors.
- the communication cable an optical fiber for optical communication or a conducting wire for electric communication is used, and the outer circumference of a single core wire or a multi-core wire is directly or loosely covered with a jacket.
- a cable form in which the communication line is covered with a jacket there is a case where a protection tube which is a jacket of the communication line is previously laid, and the communication line is inserted into the protection tube as needed later.
- FIGS. 1 and 8 are diagrams showing a communication cable provided with an anti-bending coating disclosed in Patent Document 1, wherein 1 is an optical fiber, 2 is a sheath, and 3 is an anti-bending coating.
- the optical fiber 1 shown in Fig. 18 is an optical fiber in which a core made of acrylic resin or polycarbonate resin is surrounded by a similar resin whose refractive index is slightly lower than that of the core (usually called a plastic fiber). ).
- This optical fiber 1 is covered with a sheath 2 made of elastic polyethylene resin or vinyl chloride resin or the like at the outer periphery, and the outside thereof is formed of a resin made of a resin equivalent to the sheath 2. Covered with anti-bending coating 3.
- the anti-bending coating 3 has a shape with irregularities formed by inserting a number of annular slits along the circumference of the surface. It is stated that the communication cable having this configuration can prevent the adjacent convex portions of the anti-bending coating 3 from coming into contact with each other when bent, and can prevent the communication cable from bending at a certain angle or more.
- Patent Document 1 Japanese Published Patent No. 1 1 1 2 2 3 7 5 2
- the above-described bending prevention coating 3 has a structure in which irregularities are formed on a coating portion formed of the same resin such as an elastic polyethylene resin or a butyl chloride resin, before and after adjacent convex portions come into contact with each other.
- the difference in force required for bending is small. Therefore, when the communication cable is bent, there is a risk that the communication cable may be bent to a predetermined bending diameter or less due to inertia or the like.
- the coating is deformed, and a sufficient bending prevention effect cannot be obtained. Therefore, if the uneven anti-bending coating 3 is made of a hard resin in order to reduce the deformation of the convex part, the concave part will be whitened and cracked when the communication cable is repeatedly bent. Such problems are likely to occur.
- the present invention has been made in view of the above circumstances, and can be easily bent with a small force up to a predetermined bending diameter. It is another object of the present invention to provide a communication cable and a communication line protection tube having an improved bending prevention effect.
- the communication cable according to the present invention is a communication cable in which a communication line is loosely protected by a jacket made of two or more synthetic resin layers, and the hardest hard resin layer of the jacket has a ring-shaped shape reaching the inner diameter surface. Or, it has a helical continuous annular groove in the longitudinal direction, the outermost layer of the jacket is formed of a protective layer made of a resin softer than the hard resin layer, and the adjacent edge of the annular groove when bending the communication line Are formed so as to be prevented from contacting each other and being bent to a predetermined bending diameter or less.
- the communication line protection tube according to the present invention is a communication line protection tube composed of two or more synthetic resin layers into which a communication line is inserted in a loose state, wherein the hardest hard resin layer of the protection tube is A transmissive or spiral longitudinally continuous annular groove reaching the inner diameter surface
- the outermost layer of the jacket is formed of a protective layer made of a resin softer than the hard resin layer, and when the protective tube is bent, adjacent edges of the annular groove come into contact with each other and bend to a predetermined bending diameter or less. It is formed so as not to be carried out.
- the communication line protection tube according to the present invention is a communication line protection tube having a coating layer made of a synthetic resin, wherein at least one of the coating layers has a spiral or circumferential cut. Is formed so as to completely penetrate this coating layer.
- a method for manufacturing a communication line protection tube according to the present invention is a method for manufacturing a communication line protection tube having a coating layer made of a synthetic resin, comprising: extruding a synthetic resin tube by extrusion molding; It is characterized in that it is cut spirally or circumferentially through the tube.
- a method for manufacturing a communication cable according to the present invention is a method for manufacturing a communication cable having a coating layer made of a synthetic resin, comprising: extruding a tube of a synthetic resin by extrusion molding, and then spiraling through the tube. It is characterized in that it is cut into a shape or circumference.
- FIG. 1 is a schematic diagram illustrating the present invention.
- FIG. 2 is a diagram illustrating the operation of the present invention.
- FIG. 3 is a diagram illustrating an example of a communication cable according to the present invention.
- FIG. 4 is a diagram illustrating another example of the communication cable according to the present invention.
- FIG. 5 is a diagram illustrating an example of the production example of the present invention.
- FIG. 6 is a diagram illustrating an example of the communication line protection tube of the present invention.
- FIG. 7 is a view for explaining another example of the communication line protection tube of the present invention.
- FIG. 8 is a schematic diagram illustrating another embodiment of the present invention.
- FIG. 9 is a diagram illustrating the operation of another embodiment of the present invention.
- FIG. 10 is a diagram illustrating an example of a communication cable according to another embodiment of the present invention.
- FIG. 11 is a diagram illustrating another example of a communication cable according to another embodiment of the present invention.
- FIG. 12 is a diagram illustrating another example of a communication cable according to another embodiment of the present invention.
- FIG. 13 is a diagram illustrating an example of a manufacturing example according to another embodiment of the present invention.
- FIG. 14 is a diagram illustrating another example of a communication cable according to another embodiment of the present invention.
- FIG. 15 is a diagram illustrating another example of a communication cable according to another embodiment of the present invention.
- FIG. 16 is a diagram illustrating an example of a communication line protection tube according to another embodiment of the present invention.
- FIG. 17 is a diagram illustrating another example of a communication line protection tube according to another embodiment of the present invention.
- FIG. 18 is a diagram illustrating a conventional technique.
- 10 and 10 A are communication cable cables
- 10, 10, and 10 A are communication line protection tubes
- 11, 11 A, 11 B, and 11 C are optical cables.
- Fiber core wire, 12 and 12 A are tensile fibers
- 13 and 13 A, 13 B and 13 C are jackets (coating layer)
- 13 A and A are rigid tubes
- 13 a and 13 a A, 13 aB, 13 aC are hard resin layers
- 13 b, 13 bA, 13 bB, 13 bC are protective layers
- 13 c, 13 cA are soft resins Layer
- 14 is an annular groove
- 14 A, 14 B, 14 C is a notch
- 14 a, 14 a A is an edge
- 15, 15 A is a contact
- 16, 16 A is a
- Tensile fiber, 17 and 17 A have concave grooves
- 17 ', 17 and A have small protrusions
- 18 has supply reels
- 19 and 19 have crossheads
- 20 and 20' have resin tanks
- 21 is an annular groove processing part
- 22 is a capstan
- 23 is a take-up reel
- 24 is a rotating jig
- 24 a is a processing protrusion
- 100 is a communication cable
- 101 is a high-tensile body
- 200 is manufacturing Process
- 201 is pobin
- 202 is fiber Line pobins
- 203 is an extruder
- 204 is a first tank
- 205 is a second tank
- 206 is a measuring instrument
- 207 is a capstan
- 208 is a cutting machine
- 208 A is a cutter
- 208 B is a cutter.
- Presser roller, 209 is a third water tank, 210 is a wheel capstan, 211 is a dancer roller, 211 is a take-up pobin, 300 is a communication cable, and 400 is a communication cable.
- FIG. 1 is a schematic diagram illustrating the present invention
- FIG. 2 is a diagram illustrating the operation of the present invention.
- 10 is a communication cable
- 11 is an optical fiber core
- 1 is a tensile strength fiber
- 13 is a show
- 13 a is a hard resin layer
- 13 b is a protective layer
- 13 c is a soft resin.
- the layer, 14 indicates an annular groove
- 14a indicates an edge portion
- 15 indicates a contact portion.
- the communication line when the communication line is an optical fiber, a form in which the optical fiber core 11 is covered with a jacket 13 in a loose state with or without the tensile strength fiber 12 interposed therebetween.
- the communication line when the communication line is a conductor, it is intended that the conductor is covered in a loose state by a jacket 13 with or without a shield conductor, with or without a shield conductor.
- the jacket 13 of the signal line is formed by laminating two or more synthetic resin layers in a tube shape.
- a soft resin layer 13c made of a relatively soft thermoplastic resin is disposed as the innermost resin layer, and a thermoplastic resin harder than the soft resin layer 13c and the protective layer 13b is provided on the outside.
- a hard resin layer 13a made of a thermoplastic resin is disposed, and a soft resin layer having a thickness smaller and softer than the hard resin layer 13a made of a thermoplastic resin is disposed as an outermost layer as a protective layer 13b.
- the hard resin layer 13a reaches the soft resin layer 13c in the circumferential direction (in a state of being cut in the radial direction).
- the hard resin layer 13a has a ring-shaped or spiral annular groove 14 continuously in the longitudinal direction. It is formed as follows. The groove width, groove pitch and the like of the annular groove 14 are appropriately selected according to the minimum allowable bending diameter of the communication line.
- FIG. 2 is a diagram for explaining the above-mentioned operation, and shows the relationship between the bending diameter of the communication cable 10 and the force required for bending.
- the bending diameter is relatively gentle, and the edge portion 14a of the hard resin layer 13a is in a non-contact state.
- the bending diameter becomes small and the hard resin layer 13a The edge part 14a of is in contact.
- the inner soft resin layer 13 c is exposed at the bottom of the annular groove 14 and is formed of a relatively soft resin material having a small elastic modulus. Can be bent with relatively small force.
- the protective layer 13b and the soft resin layer 13c generate tensile stress, the force required for bending sharply increases.
- the anti-bending coating has a large number of annular slits formed along the circumference of the surface, and has a convex shape. Therefore, there are regions A and B. In region B, the force required for bending is somewhat large. However, the concave portion (corresponding to the annular structure of the present invention) is formed only up to the middle of the stretchable anti-bending coating made of a single resin. For this reason, even if the protrusions come into contact with each other, the difference in the force required for bending before and after the contact occurs is small, and the state change from region A to region B is not remarkable and enters region B. Bending to the bending diameter.
- the annular groove 14 is cut in the radial direction so as to reach the soft resin layer 13c on the inner diameter surface of the hard resin layer 13a. For this reason, the difference in the force required for bending between the area A and the area B is large, and the point at which the state of the area B is reached can be easily detected at the stage of reducing the bending diameter. As a result, it can be reliably prevented from being bent to a predetermined bending diameter or less.
- FIGS. 1 and 2 the example in which the soft resin layer 13 c is inside the hard resin layer 13 a is described.
- the soft resin layer 13 c is not inside the hard resin layer 13 a, That is, even when the hard resin layer 13a is the innermost layer of the jacket 13, it can be prevented from being bent to a predetermined bending diameter or less by the same action.
- the optical fiber core 11 can move freely loosely with respect to the jacket 13, the effect of the tensile force due to bending is small, and the increase in transmission loss can be reduced.
- FIG. 3 and FIG. 4 are diagrams for explaining the embodiment of the present invention, and an example in which an optical fiber is used as a communication line will be described.
- FIG. 3 and FIG. 4 are diagrams for explaining the embodiment of the present invention, and an example in which an optical fiber is used as a communication line will be described.
- FIG. 3 (A) is a diagram showing an example having a soft resin layer inside the hard resin layer
- FIG. 3 (B) is a diagram showing an example having no soft resin layer inside the hard resin layer
- FIG. 4 (A). Shows an example in which tensile strength fibers are arranged between the hard resin layer and the protective layer
- Fig. 4 (B) shows an example in which irregularities are provided on the outer surface of the hard resin layer to prevent displacement of the tensile strength fibers. is there.
- reference numeral 16 denotes a tensile fiber
- reference numeral 17 denotes a concave groove
- the description of other symbols is omitted by using the same symbols as used in FIG.
- the optical fiber core 11 used as a communication line is formed by coating a glass fiber comprising a core part and a clad part with one or two layers of an ultraviolet curable resin.
- the optical fiber core 11 is not colored, it may be referred to as an optical fiber strand.
- the optical fiber core 11 is used in a sense including the optical fiber strand. Shall be.
- an optical fiber core 11 is made of a glass fiber having a nominal outer diameter of 0.125 mm and coated with an ultraviolet curable resin having an outer diameter of about 0.24 mm to 0.26 mm. Used.
- the communication cable 10 covers the outer periphery of the optical fiber core 11 with a jacket 13 and is used as a wiring in a vehicle or a communication device, or as a drop cable or an indoor cable.
- the jacket 13 in the present invention is formed with at least a two-layer structure of a hard resin layer 13a and a protective layer 13b.
- the hard resin layer 13a is formed of a thermoplastic resin that is harder than the protective layer 13 and the soft resin layer 13c, and preferably has a surface hardness after molding of R100 or more in a mouthpiece. .
- the resin material of the hard resin layer 13a for example, nylon 12, nylon 6, polycarbonate resin, polypropylene resin, polyterephthalate resin, ABS resin and the like are suitable.
- fillers such as glass fiber, carbon fiber, inorganic powder, and metal powder are added to these resins at a weight ratio of about 30% to reduce the coefficient of linear expansion of the hard resin layer 13a, thereby reducing the optical fiber It is desirable to reduce the difference from the coefficient of linear expansion. By reducing the difference in the coefficient of linear expansion from that of the optical fiber, it is possible to prevent an increase in transmission loss due to a difference in the line length between the jacket 13 and the optical fiber particularly when used at a low temperature.
- the protective layer 13b covers the annular groove 14 of the hard resin layer 13a, has a cushioning function for cushioning impact, and prevents foreign substances from entering the annular groove 14. Also, the appearance of the cable can be improved, and the appearance can be reduced even when the wiring is exposed indoors. Further, when the tensile strength fibers 16 are provided on the outer surface of the hard resin layer 13a, a function of holding the tensile strength fibers 16 so as not to shift can be provided.
- the protective layer 13b is formed of a thermoplastic resin that is softer and more elastic than the hard resin layer 13a. As a result, the bending portion easily expands on the outer diameter side of the bend and loosens on the inner diameter side, and does not hinder the bending characteristics as described in FIG.
- the resin material of the protective layer 13b polyethylene, polychlorinated vinyl, polyolefin-based elastomer, polyurethane and the like are suitable.
- the soft resin layer 13c when a soft resin layer 13c is provided inside the hard resin layer 13a of the jacket 13, the soft resin layer 13c is also a soft resin layer similar to the protective layer 13b. It can be formed of a fat material. Also, in this case, the elastic modulus of the inner soft resin layer 13 c is 50 MPa to 100 MPa, and the elastic modulus of the outer hard resin layer 13 a is 250 MPa MPa: LOOO OMP a. It is desirable to do.
- FIG. 3 (A) is a diagram showing an example of a cable having a form in which a soft resin layer 13c is provided inside a hard resin layer 13a.
- the flexible resin layer 13c is formed by pulling down the soft resin layer 13c with or without the tensile fiber 12 around the optical fiber core 11, and the soft resin layer 13c is It is formed in a tube shape in a loose state that does not adhere to the wire 11.
- the hard resin layer 13a is closely formed on the outer periphery of the soft resin layer 13c by extrusion.
- a spiral annular groove 14 is provided with a molding die at the time of extrusion molding, or the annular groove 14 is formed by processing a groove in a state where the resin is cured or semi-cured. Can be provided.
- the annular groove 14 of the hard resin layer 13a is formed continuously in the longitudinal direction at a depth reaching the surface of the inner soft resin layer 13c (in a state cut in the radial direction).
- the annular groove 14 can be formed by cutting the hard resin layer 13a around the soft resin layer 13c.
- the protective layer 13 b is in close contact with the outer peripheral surface of the hard resin layer 13 a on which the annular groove 14 is formed. And formed by extrusion.
- the viscosity of the resin material of the protective layer 13b is low, it can be molded by drawing down.
- FIG. 3B is a diagram showing an example of a cable in which the soft resin layer 13c is not provided inside the hard resin layer 13a.
- the hard resin layer 13a is formed by drawing down the hard resin layer 13a with or without the tensile strength fiber 12 'on the outer periphery of the optical fiber core 11, and the hard resin layer 13a is It is formed in a tube shape in a loose state that does not adhere to 1.
- the hard resin layer 13a can be provided with a spiral annular groove 14 by performing groove processing in a state where the resin is cured or semi-cured.
- the tensile strength fiber 12 ′ interposed on the outer periphery of the optical fiber core wire 11 may be embedded in a soft resin. '
- the annular groove 14 of the hard resin layer 13a is formed continuously in the longitudinal direction at a depth reaching the inner diameter surface.
- the annular groove 14 cannot be formed in a ring-shape, so that a spiral annular groove is formed.
- the protective layer 13b is formed so as to be in close contact with the outer peripheral surface of the hard resin layer 13a.
- FIG. 4A is a diagram showing an example in which tensile strength fibers 16 are arranged between the hard resin layer 13a and the protective layer 13b.
- the hard resin layer 13a can detect a bend of a predetermined diameter or less, and can suppress the bend more than it. However, if the bend is forcibly attempted, a bendable child can be used. However, as shown in Fig. 4 (A) 1, by arranging the tensile strength fibers 16 on the outer surface of the hard resin layer 13a, the bending of the optical fiber core to a predetermined bending diameter or less is suppressed, The bending of the line 11 can be prevented.
- an aramid fiber, a carbon fiber, a glass fiber, or the like can be used as the tensile strength fiber 16.
- the fiber diameter per fiber is desirably about several / im to several tens ⁇ such that when the cable is bent, the fiber located on the inner diameter side of the bend cannot be cut even if bent.
- the tensile strength fibers 16 may be arranged so as to extend vertically in the longitudinal direction of the hard resin layer 13a. It can also be wound and arranged in the opposite direction. By adjusting the winding pitch, the allowable bending range can be adjusted. Also, the tensile strength fibers 16 may be braided and arranged in the longitudinal direction of the hard resin layer 13a. Good.
- FIG. 4 (B) shows an example in which an axial groove 17 and a plurality of small protrusions 17 ′ are provided on the outer surface of the hard resin layer 13a.
- the tensile strength fiber 16 can be prevented from slipping by forming the protective layer 13b in close contact, but may be slightly shifted when curved, and if the tensile strength fiber 16 shifts, the bending prevention effect is reduced. descend. For this reason, as shown in FIG. 4 (B), by providing irregularities on the outer surface of the hard resin layer 13a, it is possible to prevent the tensile strength fiber 16 from shifting, and the predetermined diameter of the tensile strength fiber 16 The following bending can be effectively prevented.
- FIGS. 4 (A) and 4 (B) show a shape having no soft resin layer inside the hard resin layer 13a, a shape having a soft resin layer may also be used. , Can be applied as well.
- FIG. 5 is a diagram showing an example of a manufacturing example of the above-mentioned communication (optical fiber) cable.
- FIG. 5 (A) is a schematic diagram of the whole
- FIG. 5 (B) is a diagram showing an example of annular groove machining.
- 10 is the communication cable after the formation of the protective layer
- 10a is the cable immediately after the formation of the hard resin layer
- 10b is the cable after groove processing
- 11 is the optical fiber core
- 18 is the supply Reels
- 20 and 20 are resin tanks
- 21 is an annular grooved part
- 22 is a capstan
- 23 is a take-up reel
- 24 is a rotary jig. , 24a indicate the processed protrusion.
- the optical fiber core 11 is fed from a supply reel 18, and a soft resin layer and a hard resin layer are formed by a first cross head 19.
- the first crosshead 19 is supplied with a thermoplastic resin for a soft resin layer and a thermoplastic resin for a hard resin layer from a resin tank 20.
- FIG. 5 (A) shows an example in which the soft resin layer and the hard resin layer are formed by one cross head 19, the soft resin layer and the hard resin layer are formed by separate cross heads. You may make it. In the case where the soft resin layer is not provided, only the hard resin layer is formed.
- the annular groove 14 is formed by the annular groove processing portion 21 in the hard resin layer.
- a protective layer is formed outside the cable 10b with the annular groove 14 formed, it is secured by the second crosshead 19, A protective layer is formed.
- the second crosshead 19 ′ is supplied with a relatively soft thermoplastic resin from a resin tank 20.
- the tensile strength fibers are supplied between the annular groove processing portion 21 and the second crosshead 19 ′, and are attached to the outer surface of the cable 10b. Adhesion is fixed by molding the protective layer.
- the communication cable 10 after the formation of the protective layer is taken up by the capstan 22 and wound up by the take-up reel 23.
- the annular groove processing portion 21 may have a configuration provided with a cylindrical rotating jig 24 having a processing projection 24 a inside.
- the rotation jig 24 is rotatably disposed on the cable 10a immediately after the hard resin layer is provided, and forms a spiral annular groove 14 in the hard resin layer.
- the annular groove 14 is formed by pressing the hard resin layer in the hardened or semi-hardened state from the outer periphery, or the processed protrusion 24 a is formed of one of the resin layers. It is formed by shaving off the part.
- the outer sheath is directly formed in a loose state on the outer periphery of the optical fiber core has been described, but only the outer sheath is formed in advance as a tubular communication line protective tube, and the optical fiber core is later formed. It can also be used by inserting it into the protective tube.
- the configuration of the communication protection tube can be shown as a tubular body with the shape shown in Figs.
- FIG. 6- (A) is a diagram showing an example in which a soft resin layer is provided inside a hard resin layer.
- Fig. 7 (A) shows an example in which tensile strength fibers are arranged between the hard resin layer and the protective layer
- Fig. 7 (B) shows FIG. 4 is a view showing an example of providing irregularities on the outer surface of a hard resin layer to prevent displacement of tensile strength fibers.
- the reference numerals in the figures are the same as those used in FIGS.
- FIG. 6 (A) is an example of a communication line protective tube 10 ′ having a soft resin layer 13 c inside the hard resin layer 13 a.
- the soft resin layer 13c is formed into a circular tube shape, and a hard resin layer 13a that is harder than the soft resin layer 13c is formed on the outer periphery thereof.
- a circular or spiral annular groove 14 is formed.
- the annular groove 14 has a depth that reaches the inner soft resin layer 13 c Formed continuously in the same direction.
- a protective layer 13b made of a resin softer than the hard resin layer 13a is formed on the outer surface of the hard resin layer 13a.
- FIG. 6 (B) is an example of a communication line protection tube 10 ′ having no soft resin layer 13 c inside the hard resin layer 13 a.
- the hard resin layer 13a is formed into a circular tube shape, and a spiral annular groove 14 is formed in the hard resin layer 13a.
- the annular groove 14 is formed continuously in the longitudinal direction at a depth reaching the inner diameter surface.
- a protective layer 13b made of a resin softer than the hard resin layer 13a is formed on the outer surface of the hard resin layer 13a.
- FIG. 7A is an example of a communication line protection tube 10 ′ in which a tensile fiber 16 is arranged between the hard resin layer 13 a and the protection layer 13 b.
- the tensile strength fiber 16 is provided by various methods of longitudinally attaching, winding, and braiding in the longitudinal direction of the hard resin layer 13a.
- FIG. 7 (B) is an example of a communication line protective tube 10 ′ in which irregularities are formed on the outer surface of the hard resin layer 13 a in order to suppress the displacement of the tensile strength fibers 16.
- . 7 (A) and 7 (B) show a shape having no soft resin layer inside the hard resin layer 13a, but a shape having a soft resin layer may also be used. The same can be applied.
- the communication line protection tube 10 ′ shown in FIGS. 6 and 7 described above can prevent bending by the same configuration and operation as described in the example of the communication cable in FIGS. 1 to 4.
- the communication line protection tube 10 ′ is laid beforehand indoors or the like, and a communication line such as an optical fiber or a signal conductor can be inserted as necessary, and can be used as a communication cable.
- the insertion of the communication line (for example, the optical fiber core 11) into the communication line protection tube 10 ' can be performed by using various known wiring methods.
- FIG. 8 is a schematic diagram illustrating another embodiment of the communication cable, and FIG.
- 1 OA is a communication cable
- 11 A is an optical fiber
- 12 A is a tensile strength fiber
- 13 A is an outer layer (covered layer)
- 13 a A is a hard resin layer
- 13 b A is a protective layer
- 13 c A indicates the soft resin layer
- 14 A indicates the cut
- 14 a A indicates the edge of the cut
- 15 A indicates the contact.
- the optical fiber core 11A is interposed with or without the tensile strength fiber 12A, and is loosely covered by the outer sheath 13A. Covered form.
- the target shall be one in which a twisted pair conductor or a burned conductor is covered in a loose state by a jacket 13A with or without a shield conductor.
- the jacket 13A of the signal line (optical fiber core 11A) is formed by laminating one or more synthetic resin layers in a tube shape.
- a soft resin layer 13 cA made of a relatively soft thermoplastic resin is disposed, and the outer side is harder than the soft resin layer 13 cA and the protective layer 13 bA.
- a hard resin layer made of thermoplastic resin 13aA is disposed on the outermost layer, and a soft resin layer thinner and softer than the hard resin layer 13aA made of thermoplastic resin is disposed as the outermost layer as a protective layer 13bA. Is done.
- the hard resin layer 13aA reaches the soft resin layer 13cA in the circumferential direction (in a state cut in the radial direction).
- a circumferential or spiral cut portion 14A is continuously formed in the longitudinal direction. It is formed so that it may have.
- the cutout 14A can be widened in the longitudinal direction by expanding the cutout 14A, or the cutout can be formed at the same time as the cutout.The width depends on the minimum allowable bending diameter of the communication line. Is appropriately selected.
- the cutout portion 14A is closed on the side of the curve, and the cutout portion 14A is opened on the outer side. .
- the edges 14 a of the hard resin layer 13 a A adjacent to the cut 14 adjacent to the inside of the curve contact each other, and the edges 14 a A contact each other. Bending proceeds from the contact portion 15 A generated by the heat.
- Fig. 9 is a diagram for explaining the above operation. It shows the relationship between the required forces.
- the area A has a relatively gentle bending diameter and the edge portion 14 a of the hard resin layer 13 a A is in a non-contact state
- the area B has a hard resin layer 1 having a reduced bending diameter. Edge part of 3 a A 1 4 a A is in contact.
- the inner soft resin layer 13 c A is exposed at the bottom of the cutout 14 A and is formed of a relatively soft resin material having a small elastic modulus. Can be bent with relatively small force.
- the protective layer 13bA and the soft resin layer 13cA generate tensile stress, the force required for bending sharply increases.
- the anti-bending coating has a large number of annular slits formed along the circumference of the surface, and has an H0 convex shape. Therefore, the area A and the area B exist, and in the area B, the force required for bending is slightly increased.
- the concave portion is formed only up to the middle of the elastic anti-bending coating formed of a single resin. Therefore, even if the protrusions come into contact with each other, the difference in the force required for bending before and after the contact occurs is small, and the state change from region A to region B is not remarkable and enters region B. Bending to the bending diameter.
- the cut portion 14A is formed by being cut in the radial direction so as to reach the soft resin layer 13cA on the inner diameter surface of the hard resin layer 13aA. .
- the difference in the force required for bending between the region ⁇ and the region B is large, and it is possible to easily detect the point in time when the state of the region B is reached when the bending diameter is reduced. As a result, it can be reliably prevented from being bent to a predetermined bending diameter or less.
- Figs. 8 and 9 the example in which the soft resin layer 13cA is inside the hard resin layer 13aA has been described, but the soft resin layer 13cA is inside the hard resin layer 13aA.
- the hard resin layer 13aA is the innermost layer of the jacket 13A, it can be prevented from being bent to a predetermined bending diameter or less by the same action. Also, since the optical fiber core 11A can move freely with respect to the jacket 13A loosely, the influence of the bending force due to bending is small, and the increase in transmission loss can be reduced.
- FIGS. 10 and 11 are diagrams for explaining another embodiment of the present invention. An example using an optical fiber will be described.
- FIG. 10 (A) is a diagram showing an example having a soft resin layer inside the hard resin layer
- FIG. 10 (B) is a diagram showing an example having no soft resin layer inside the hard resin layer
- FIG. (A) shows an example in which tensile strength fibers are arranged between the hard resin layer and the protective layer
- Fig. 11 (B) shows an example in which irregularities are provided on the outer surface of the hard resin layer to prevent displacement of the tensile strength fibers.
- FIG. In the figure, 16 A is a tensile fiber
- 17 A is a concave groove
- 17 ′ is a small protrusion
- the other symbols are the same as those used in FIG.
- the optical fiber core 11A used as a communication line is formed by coating a glass fiber comprising a core part and a clad part with one or two layers of an ultraviolet curing resin. If the optical fiber core 11A is not colored, it may be referred to as an optical fiber strand. In the present invention, the optical fiber core 11A includes the optical fiber strand. Shall be used. For example, for an optical fiber core 11 A, the nominal outer diameter is 0.
- a 125 mm glass fiber coated with an ultraviolet curable resin with an outer diameter of about 0.24 mm to 0.26 mm is used.
- the communication cable 10A covers the outer circumference of the optical fiber core 11A with a jacket 13A, and is used as a wiring in a vehicle or a communication device, or as a drop cable or an indoor cable.
- the outer cover (coating layer) 13 A in the present invention may be formed of one layer of a hard resin layer 13 aA, and the hard resin layer 13 a A and the protective layer
- At least 13 bA may be formed in a two-layer structure.
- the hard resin layer 13 aA is formed of a thermoplastic resin that is harder than the protective layer 13 bA and the soft resin layer 13 cA, and the surface hardness after molding may be R 100 or more in a mouthpiece. preferable.
- the resin material of the hard resin layer 13aA for example, nylon 12, nylon 6, polycarbonate resin, polypropylene resin, polyterephthalate resin, ABS resin and the like are suitable.
- fillers such as glass fibers, carbon fibers, inorganic powders, and metal powders are added to these resins at a weight ratio of about 30% to reduce the linear expansion coefficient of the hard resin layer 13aA, thereby reducing the optical fiber It is desirable to reduce the difference from the coefficient of linear expansion. By reducing the difference in the coefficient of linear expansion from the optical fiber, it is possible to prevent an increase in transmission loss due to a difference in the line length between the jacket 13A and the optical fiber particularly when used at a low temperature.
- the protective layer 13bA covers the cutout 14A of the hard resin layer 13aA, has a cushioning function for cushioning impact, and prevents foreign matter from entering the cutout 14.
- the appearance of the cable can be improved, and the appearance can be reduced even when the wiring is exposed indoors. Further, when the tensile strength fiber 16A is provided on the outer surface of the hard resin layer 13aA, a function of holding the tensile strength fiber 16A so as not to shift can be provided.
- the protective layer 13bA is formed of a thermoplastic resin that is softer and more elastic than the hard resin layer 13aA. As a result, at the bent portion, the bend easily expands on the outer diameter side and loosens on the inner diameter side, and does not hinder the bending characteristics as described with reference to FIG.
- the resin material of the protective layer 13bA polyethylene, polychlorinated vinyl, polyolefin-based elastomer, polyurethane, and the like are suitable.
- the soft resin layer 13 cA when the soft resin layer 13 cA is provided inside the hard resin layer 13 aA of the outer casing 13 A, the soft resin layer 13 cA is also referred to as the protective layer 13 bA. It can be formed of a similar soft resin material. In this case, it is preferable that the elastic modulus of the inner soft resin layer 13 cA is 50 MPa to 1 000 MPa, and the elastic modulus of the outer hard resin layer 13 a A is 2500 MPa a; LOOO OMPa. .
- FIG. 10 (A) is a diagram illustrating an example of a cable in which a soft resin layer 13 cA is provided inside a hard resin layer 13 aA.
- the soft resin layer 13 cA is formed by pulling down the soft resin layer 13 cA with or without the intermediary of the tensile strength fiber 12 A around the outer periphery of the optical fiber core 11 A. Is formed in a tube shape in a loose state that does not adhere to the optical fiber core wire 11A.
- the hard resin layer 13aA is closely adhered to the outer periphery of the soft resin layer 13cA by extrusion.
- the hard resin layer 13aA is provided with a spiral cutout 14A with a molding die at the time of extrusion forming, or the cutout 14A is formed by cutting the resin in a hardened or semi-cured state. Can be provided.
- the cut portion 14 A of the hard resin layer 13 a A is formed continuously in the longitudinal direction at a depth reaching the surface of the inner soft resin layer 13 c A (cut in the radial direction). .
- the hard resin layer 13 a A is sliced on the basis of the soft resin layer 13 cA to form the cut portion 14 A.
- the protective layer 13bA is formed by extrusion molding so as to be in close contact with the outer peripheral surface of the hard resin layer 13aA in which the cutouts 14 are formed.
- the viscosity of the resin material of the protective layer 13bA is low, it can be molded by drawing down.
- FIG. 10 (B) is a diagram illustrating an example of a cable in which the soft resin layer 13 cA is not provided inside the hard resin layer 13 aA.
- the hard resin layer 13a is drawn down around the optical fiber core 11A with or without the tensile strength fiber 12'A, and the hard resin layer 13a It is formed in a tube shape in a loose state that does not adhere to the fiber core 11A.
- the hard resin layer 13aA can be provided with a spiral cut portion 14A by performing a cutting process in a state where the resin is cured or semi-cured.
- the tensile strength fiber 12'A interposed on the outer periphery of the optical fiber core wire 11A may be embedded in a soft resin.
- the cut portion 14A of the hard resin layer 13aA is formed continuously in the longitudinal direction at a depth reaching (through) the inner diameter surface.
- the cutout 14A cannot be formed in a circular shape, so that a spiral cut is formed.
- the protective layer 13 bA is formed so as to be in close contact with the outer peripheral surface of the hard resin layer 13 aA in which the cutout 14 is formed.
- FIG. 11 (A)' is a diagram showing an example in which tensile strength fibers 16A are arranged between the hard resin layer 13aA and the protective layer 13bA '.
- the hard resin layer 13aA can detect bending with a predetermined diameter or less and suppress bending beyond that, but it is also possible to bend if trying to forcibly bend.
- Fig. 11 (A) by arranging the tensile strength fiber 16A on the outer surface of the hard resin layer 13aA, it is prevented from being bent to a predetermined bending diameter or less, and the optical fiber The bending of the core wire 11 A can be prevented.
- aramid fiber, carbon fiber, glass fiber and the like can be used as the tensile strength fiber 16A.
- the fiber diameter per fiber is desirably about zm to several tens of ⁇ m, such that when the cable is bent, the fiber located on the inner diameter side of the bend does not break even if bent.
- Tensile strength fiber 16 A is shown in Fig. 11 (A).
- the hard resin layer 13aA may be arranged so as to be vertically attached in the longitudinal direction, but in addition, the hard resin layer 13aA may be arranged by being wound in a direction opposite to the spiral direction of the cutout portion 14A. By adjusting the winding pitch, the allowable bending range can be adjusted. Further, the tensile strength fibers 16A may be braided in the longitudinal direction of the hard resin layer 13aA.
- FIG. 11 (B) shows an example in which a groove 17A in the axial direction and a plurality of small protrusions 17'A are provided on the outer surface of the hard resin layer 13aA.
- the tensile strength fiber 16A can be prevented from slipping by forming the protective layer 13bA tightly.However, it may be reduced a little when it is curved. Bending prevention effect decreases. For this reason, as shown in Fig. 11 (B), by providing irregularities on the outer surface of the hard resin layer 13aA, the tensile strength fiber 16A can be prevented from shifting, and the tensile strength fiber 16a can be prevented. A can be effectively prevented from bending below a predetermined diameter.
- FIGS. 11 (A) and 11 (B) show a shape having no soft resin layer inside the hard resin layer 13aA, a shape having a soft resin layer is shown. The same can be applied to
- FIG. 12 shows another embodiment of the communication cable according to the present invention, in which an optical fiber core 11 A and a high tension member 101 are provided inside a hard resin layer 13 a A which is a coating layer.
- An example of the arranged communication cable 100 is shown.
- the high-tensile body 101 has an elliptical cross section, and the optical fiber core 11A is arranged between the two high-tensile bodies 101 and 101 in the direction of the minor axis of the ellipse.
- Vectran trade name, manufactured by Kuraray Co., Ltd.
- the outside of the fiber core 11A and the high-tensile body 101 is covered with a hard resin layer 13aA in which a spiral cutout 14A is formed.
- the cutout portion 14A has almost no cutout width.
- the width of the cut can be set in advance. It is desirable that the width 1 of the cut portion 14 A be 10% or less of the width of the portion having no cut.
- the protective layer 13 bA shrinks during the production of the communication cable, or if it is used under long-term high temperature conditions Due to shrinkage due to the like, the cut width becomes small, and the high-tensile body 101 or the optical fiber core wire 11A meanders inside the hard resin layer 13aA, and the transmission characteristics of communication may be reduced. is there. If it is 10% or less, a bad influence on transmission characteristics can be prevented as much as possible.
- the characteristics of the optical fiber core 11 A built into the communication cable 100 include a mode field diameter (MFD) of 8.8 ⁇ m or less at a wavelength of 1.3 ⁇ m, and a cable power-off wavelength ( cc ). However, it is desirable that the screwing level of the optical fiber core 11A is 1.2 ° / 0 or less. In the communication cable 100 using the optical fiber cable 11 A having such characteristics, even when the communication cable 100 is bent slightly (eg, bending radius 15 mm), the optical fiber cable 11 A Good transmission characteristics can be maintained.
- the hard resin layer 13aA outside the optical fiber core 11A contains a filler of potassium titanate, and is excellent in low shrinkage, impact resistance and lateral pressure resistance.
- the hard resin layer 13aA contains filler, there is also an advantage that damage to the cylinder of the extruder during extrusion can be prevented as much as possible.
- the outer periphery of the hard resin layer 13aA is covered with a protective layer 13bA having a lower elastic modulus than the hard resin layer.
- the cut portion 14 A of the hard resin layer 13 a A triggers the cut portion 14 A of one side to contact the edge portion 14 a A of the cut portion, while the other end of the cut portion 14 A contacts.
- the page part 14a is separated from the terminal! /, And the communication cable 100 'begins to bend (see Fig. 8).
- a resistance (tensile resistance) to the bending of the two high-tensile members 101, 101 and the protective layer 13bA acts, and when the bending becomes more than a desired bending, the bending becomes difficult.
- buckling and kink of the communication cable 100 can be prevented, and a clean bend can be formed.
- FIG. 13A shows an example of a manufacturing process 200 of the communication cable 100 shown in FIG. From the left end on the upstream side, the high tension members 101 and 101 are sent out from the two pobins 201 and 201. Thereafter, at the fiber core bobbin 202, the optical fiber core 11A merges so as to be sandwiched between the two high tension members 101 and 101. When these are sent to the extruder 203, the high tension members 101, 101 and The hard tube 13 AA is extruded from the extruder 203 so as to cover the outside of the optical fiber core 11 A. The extruded hard tube 13 AA is cooled by the first water tank 204 and the second water tank 205, and the diameter of the hard tube 13 AA is measured by the measuring instrument 206. After the measurement, it passes through a capstan 207 and is sent to a cutting machine 208, where a spiral cutting is performed.
- FIG. 13 (B) shows an enlarged view of a main part of the cutting machine 208.
- the cutting machine 208 includes a disk-shaped cutter 208A, and a pair of pressing rollers 208B, 208B adjacent to the cutter 208A.
- the cutter 208A and the holding rollers 208B and 208B are set at a desired angle with respect to the longitudinal axis of the hard tube 13AA and the hard resin layer 13aA on which the cut portion 14A is formed. This angle is the spiral angle of the cutout 14A.
- the hard tube 13 AA is sent to the slitting machine 208, the hard tube 13 AA is pressed by a pair of press rollers 208B and 208B, and penetrates the hard tube 13AA by a cutter 208A.
- Notched cuts are formed.
- Each rotation of the cutter 208A and the presser rollers 208B and 208B rotates in the direction shown by the arrow, and the cutter 208A and the presser rollers 208B and 208B as a whole are hard tubes 13AA (hard By rotating around the resin layer 13 a A) in the direction shown by the arrow T, a spiral cut is formed.
- To form a circumferential cut in the hard tube 13 AA instead of the spiral cut connect the cutter 208 A and the holding rollers 208 B, 208 B to the hard tube 13 AA (hard resin).
- a circumferential cut is made by placing the layer 13a at right angles to the longitudinal axis of A).
- the hard resin layer 13 a A on which the spiral cut portion 14 A is formed is cooled in the third water tank 209, and is wound up via the wheel capstan 210 and the dancer roller 211 so as to be wound 2. It is wound up on 1 and 2. Further, in the next step (not shown), the hard resin layer 13 a A containing the optical fiber core 11 A and the high-tensile members 101, 101 is sent out from the winding bobbin 212, and is extruded by an extruder. The outer periphery of the hard resin layer 13aA is covered with the protective layer 13bA.
- a high elastic fiber or a high elastic fiber having a higher elastic modulus than the protective layer 13 bA is used between the hard resin layer 13 aA and the protective layer 13 bA.
- a high elastic fiber or a high elastic fiber having a higher elastic modulus than the protective layer 13 bA is used between the hard resin layer 13 aA and the protective layer 13 bA.
- the communication cable 100 shown in FIG. 12 can be manufactured.
- the loose fiber communication cable in which the optical fiber core and the jacket (coating layer) are not in close contact has been described.
- FIG. 14 shows another embodiment of the communication cable according to the present invention, which is an example of a communication cape in which an optical fiber core and a jacket (coating layer) are in close contact with each other.
- the communication cable ⁇ 300 has an optical fiber core 11 B and a hard resin layer 13 a B covering the outer periphery of the optical fiber core 11 B, and the hard resin
- the layer 13aB has a helical cutout 14B penetrating therethrough.
- the outer periphery of the hard resin layer 13 a B is filled with a tensile strength fiber 16 B, and a protective layer 13 b B covers around the hard resin layer 13 a B and the tensile strength fiber 16 B.
- This communication cable 300 is formed by extruding a hard tube as a coating layer around the optical fiber core 11 B, and after cooling, forming a cutout 14 B in the hard tube to form a hard resin layer 13. a Manufacture B. Thereafter, the tensile strength fiber 16B is supplied, and the protective layer 13bB is extruded around the hard resin layer 13aB and the tensile strength fiber 16B to form a communication cable 300. I do.
- the communication cable 300 manufactured and manufactured as described above has the optical fiber core 11 B and the hard resin layer 13 a B in close contact with each other, while the hard resin layer 13 a B At the cut portion 14B, the two are not in close contact. Therefore, when the communication cable 300 is bent, it can be easily bent to a desired bending diameter. However, if the communication cable 300 is further bent, the adhesion between the optical fiber core 11B and the hard resin layer 13aB is reduced. The tensile strength fiber 16B and the protective layer 13bB generate resistance to bending and make it difficult to bend, thereby preventing buckling and the like of the communication cable 300.
- FIG. 15 shows an example of a substantially rectangular communication cable having a rectangular shape.
- This communication cable 400 has an optical fiber core 1 inside a rectangular hard resin layer 13 a C having a cutout 14 C formed therein. 1 C is accommodated, and if necessary, a high-tensile body can be accommodated.
- the outside of the hard resin layer 13 a C is covered with a rectangular protective layer 13 b C, and if necessary, tensile strength fibers etc. are placed between the hard resin layer 13 a C and the protective layer 13 b C be able to.
- the communication cable can be stably arranged on a wall or a floor in the case of indoor wiring.
- the shape of the communication cable is not limited to a rectangle, and the present invention can be applied to a communication cable having, for example, a polygonal cross-sectional shape.
- the communication cable according to the present invention even if the coating layer has a single layer and the cut portion is formed, the communication cable can be provided so that the ends of the cut portion are not in contact with each other and are not excessively bent. . If a helical cut is formed in a communication caple (communication cable protection tube) consisting of a single coating layer, the ends of the cuts contact each other inside the bend to restrict bending. On the outside, however, it is possible to restrict the bending to be smaller than the desired bending radius by acting on the elongation due to bending.
- the cut portion is partially or periodically formed on the outer periphery in the longitudinal direction of the cut coating layer.
- the notches contact each other to restrict bending, and at the outside, the bend resistance is exerted by the tensile fiber etc. Bending can be regulated.
- the configuration of the communication protection tube has the shape shown in FIGS. 10 to 11 and can be shown as a tubular body excluding the optical fiber core.
- FIGS. 16 and 17 are diagrams schematically showing another embodiment of the communication line protective tube
- FIG. 16 (A) is a diagram showing an example having a soft resin layer inside a hard resin layer
- FIG. 16 (B) shows an example in which a soft resin layer is not provided inside a hard resin layer
- FIG. 17 (A) shows an example in which tensile strength fibers are arranged between a hard resin layer and a protective layer
- Fig. 17 (B) shows an example in which irregularities are provided on the outer surface of the hard resin layer to prevent displacement of the tensile strength fibers.
- FIG. 16 (A) is an example of a communication line protection tube 10 ′ A having a soft resin layer 13 cA inside a hard resin layer 13 aA.
- the soft resin layer 13 cA is formed into a circular tube shape, and a hard resin layer 13 aA harder than the soft resin layer 13 cA is formed on the outer periphery thereof.
- a circular or spiral cut 14A is formed in 3aA. The cut portion 14A is formed continuously in the longitudinal direction at a depth reaching the inner soft resin layer 13cA.
- a protective layer 13bA made of a resin softer than the hard resin layer 13aA is formed on the outer surface of the hard resin layer 13aA.
- FIG. 16 (B) is an example of a communication line protection tube 10 ′ A that does not include the soft resin layer 13 c A inside the hard resin layer 13 a A.
- the hard resin layer 13aA is formed into a circular tube shape, and a spiral cut portion 14A is formed in the hard resin layer 13aA.
- the cutout 14A is formed continuously in the longitudinal direction at a depth reaching the inner diameter surface.
- a protective layer 13bA made of a resin softer than the hard resin layer 13aA is formed on the outer surface of the hard resin layer 13aA.
- FIG. 17 (A) shows the communication line protection tubes 10 and A in which tensile fibers 16A are arranged between the hard resin layer 13aA and the protective layer 13bA. It is an example.
- the tensile strength fiber 16A is provided by various methods of longitudinally attaching, winding, and braiding in the longitudinal direction of the hard resin layer 13aA.
- FIG. 17 (B) is a communication line protection tube 10 ′ in which four convexes are formed on the outer surface of the hard resin layer 13 a A in order to suppress the displacement of the tensile strength fiber 16 A.
- This is an example of A.
- FIGS. 17 (A) and 17 (B) the shape having no soft resin layer inside the hard resin layer 13aA is shown, but the shape having the soft resin layer is shown. The same can be applied to
- the communication line protection tube 10'A shown in FIGS. 16 and 17 described above has the same configuration and operation as described in the example of the communication cable in FIGS. 8 to 11 to prevent bending. be able to.
- the communication line protective tube 10'A is previously laid indoors or the like, and if necessary, a communication line such as an optical fiber or a signal conductor is inserted thereinto, and the communication line is connected to the communication cable. It can be used. Insertion of communication lines (for example, optical fiber core wires 11A) into communication line protective tube 10'A can be performed using various known wiring methods. Possibilities>
- the difference of the force required for bending before and after the edge parts of the hard resin layer adjacent to each other across the annular groove or the cut portion can be doubled or more. . For this reason, it is possible to easily bend with a small force up to a predetermined bending diameter, but it is difficult to bend because it requires a large force to bend below.
- the tensile strength fibers on the outer surface of the hard resin layer, it is possible to prevent the hard resin layer from being bent to a predetermined diameter or less.
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- Architecture (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU2003289349A AU2003289349A1 (en) | 2002-12-18 | 2003-12-15 | Protective tube for communication cable and communication wire |
Applications Claiming Priority (4)
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JP2002366349 | 2002-12-18 | ||
JP2002-366349 | 2002-12-18 | ||
JP2003-413905 | 2003-12-11 | ||
JP2003413905A JP2004215494A (ja) | 2002-12-18 | 2003-12-11 | 通信ケーブル及び通信線用保護管 |
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US (1) | US7064276B2 (ja) |
JP (1) | JP2004215494A (ja) |
AU (1) | AU2003289349A1 (ja) |
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JP3104147U (ja) * | 2004-03-22 | 2004-09-02 | 株式会社ワイヤードジャパン | 光ファイバコード |
GB2418717B (en) * | 2004-09-29 | 2009-08-12 | Miniflex Ltd | Linear member |
JP2007151337A (ja) * | 2005-11-29 | 2007-06-14 | Chugoku Electric Power Co Inc:The | ケーブル保持具 |
US7695197B2 (en) * | 2006-04-20 | 2010-04-13 | Tyco Electronics Corporation | Bend limiter |
JP2007322629A (ja) * | 2006-05-31 | 2007-12-13 | Mitsubishi Cable Ind Ltd | 車載用光ファイバケーブル |
US20090069804A1 (en) * | 2007-09-12 | 2009-03-12 | Jensen Jeffrey L | Apparatus for efficient power delivery |
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- 2003-12-15 AU AU2003289349A patent/AU2003289349A1/en not_active Abandoned
- 2003-12-15 WO PCT/JP2003/016041 patent/WO2004055835A1/ja active Application Filing
- 2003-12-18 US US10/738,224 patent/US7064276B2/en not_active Expired - Lifetime
- 2003-12-18 TW TW092135971A patent/TWI296724B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
US7064276B2 (en) | 2006-06-20 |
TWI296724B (en) | 2008-05-11 |
US20050098342A1 (en) | 2005-05-12 |
TW200428058A (en) | 2004-12-16 |
JP2004215494A (ja) | 2004-07-29 |
AU2003289349A1 (en) | 2004-07-09 |
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