Photoelectric composite tethered cable

Abstract

The application discloses an optical-electricity composite tethered cable, and relates to the technical field of cables, which comprises a central high-strength bearing core, an optical-electricity composite cable core, an inner layer tight isolation layer, an axial super-strong tensile layer and a wear-resistant and weather-resistant outer sheath, the optical-electricity composite cable core is arranged around the outside of the central high-strength bearing core, the inner layer tight isolation layer is wrapped outside the optical-electricity composite cable core, the gap between the central high-strength bearing core and the optical-electricity composite cable core and the gap between the optical-electricity composite cable core and the inner layer tight isolation layer are filled with tensile buffer water-resistant fillers, the axial super-strong tensile layer is wrapped outside the inner layer tight isolation layer, and the wear-resistant and weather-resistant outer sheath is wrapped outside the axial super-strong tensile layer. The optical-electricity composite tethered cable solves the problems of the traditional tethered cable, such as the mutual restriction of tensile performance and optical-electricity transmission performance, loose structure, weak bearing capacity, short service life under harsh environments and the like.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and in particular to a photoelectric composite tethered cable. Background Technology

[0002] With the rapid development of high-altitude tethered equipment, deep-sea towed exploration equipment, and heavy-duty airborne suspension equipment, the tethered cables used in conjunction with these equipment must simultaneously meet multiple performance requirements, including continuous power transmission, stable optical signal transmission, ultra-high axial tensile strength, ultra-strong breaking strength, resistance to long-term fatigue towing, and resistance to deformation. They must also possess characteristics such as light weight, small diameter, and lightning protection. Conventional optoelectronic composite tethered cables suffer from several fundamental technical defects. 1. The load-bearing structure is poorly designed, using only a single layer of fiber or steel wire for simple reinforcement. The axial tensile strength is low and the breaking strength is insufficient. During long-term high-tension suspension and dragging operations, it is very easy to cause overall breakage and cable tearing, resulting in extremely poor safety and stability.

[0003] 2. The integrated deployment of the optoelectronic unit and the load-bearing structure means that the axial tensile force acts directly on the optical fiber and the power supply copper core, which can easily cause optical fiber breakage, signal attenuation, and deformation and breakage of the power supply core wire. It is impossible to balance strong load-bearing capacity and stable optoelectronic transmission.

[0004] 3. The cable structure is loose, with poor resistance to lateral compression and bending. After repeated bending, the internal cable cores shift and the layers misalign, resulting in overall structural failure. It cannot be adapted to extreme, harsh, and high-load continuous operation scenarios.

[0005] 4. It has poor weather resistance, wear resistance, and fatigue resistance, resulting in a short service life. It cannot meet the stringent requirements of high-strength tensile force and high-frequency reciprocating use in harsh outdoor environments such as high altitude, deep sea, and outdoor environments.

[0006] It is evident that existing tethered cables generally suffer from a trade-off between tensile breaking strength and photoelectric transmission performance, making it difficult to simultaneously achieve ultra-high breaking force and stable photoelectric transmission. This severely limits the operational safety and service life of heavy tethered, deep-sea, and high-altitude special equipment. Summary of the Invention

[0007] To address the above technical problems, this invention provides a photoelectric composite tethered cable, which solves the problems of mutual constraints between tensile strength and photoelectric transmission performance, loose structure, weak load-bearing capacity, and short service life in harsh environments of traditional tethered cables.

[0008] To achieve the above objectives, the present invention provides the following solution: This invention provides a photoelectric composite tethered cable, comprising a central high-strength load-bearing core, a photoelectric composite cable core, an inner binding and insulating layer, an axial ultra-high tensile strength layer, and a wear-resistant and weather-resistant outer sheath. The photoelectric composite cable core is arranged around the outside of the central high-strength load-bearing core. The inner binding and insulating layer wraps around the outside of the photoelectric composite cable core. The gaps between the central high-strength load-bearing core and the photoelectric composite cable core, as well as the gaps between the photoelectric composite cable core and the inner binding and insulating layer, are filled with tensile-resistant, buffering, and water-blocking fillers. The axial ultra-high tensile strength layer wraps around the outside of the inner binding and insulating layer, and the wear-resistant and weather-resistant outer sheath wraps around the outside of the axial ultra-high tensile strength layer.

[0009] Preferably, the optoelectronic composite cable core includes a single-mode optical fiber unit and multiple conductive power supply units. The multiple conductive power supply units are arranged around the outside of the central high-strength load-bearing core. The inner layer of the clamping and isolation layer is wrapped around the outside of the multiple conductive power supply units. The single-mode optical fiber unit is located between the conductive power supply unit and the inner layer of the clamping and isolation layer.

[0010] Preferably, the single-mode fiber unit includes a single-mode fiber body and a loose tube sleeved outside the single-mode fiber body, and water-blocking buffer grease is filled between the single-mode fiber body and the loose tube sleeve.

[0011] Preferably, the conductive power supply unit includes a conductive power supply core wire and an insulating layer wrapped around the conductive power supply core wire.

[0012] Preferably, the inner binding isolation layer is an inner semi-conductive isolation layer.

[0013] Preferably, it further includes a tensile buffer water-blocking layer, which is wrapped around the outside of the inner binding isolation layer.

[0014] Preferably, it further includes an outer semi-conductive insulating layer, which is wrapped around the outside of the tensile buffer water-blocking layer, and the axial ultra-strong tensile layer is wrapped around the outside of the outer semi-conductive insulating layer.

[0015] Preferably, it further includes a metal lightning protection layer, which is wrapped around the outside of the axially strong tensile layer, and the wear-resistant and weather-resistant outer sheath is wrapped around the outside of the metal lightning protection layer.

[0016] Preferably, the high-strength load-bearing core at the center is a carbon fiber stranded core impregnated with high-temperature resistant epoxy resin.

[0017] Preferably, the axial ultra-high tensile strength layer is a bidirectional cross-woven composite layer of ultra-high molecular weight polyethylene fiber and high-strength silver-plated copper wire, and the wear-resistant and weather-resistant outer sheath is extruded from polyurethane elastomer sheath material.

[0018] The present invention achieves the following technical effects compared to the prior art: The high-strength central load-bearing core in this invention serves as the core main load-bearing structure, positioned at the geometric center of the cable. It possesses ultra-high axial tensile strength, tensile deformation resistance, and fracture resistance. The gaps between the photoelectric composite cable cores are filled with tensile-resistant, buffering, and water-blocking fillers to further disperse tensile force and buffer impact. An outer layer with ultra-high axial tensile strength forms a secondary reinforced load-bearing structure. The dual-layer load-bearing structure works synergistically to significantly improve the overall breaking strength of the cable. Specifically, the independent central load-bearing structure combined with an outer axial composite tensile double-layer ultra-high load-bearing structure completely isolates the photoelectric composite cable core from the load-bearing structure, maximizing the overall axial breaking tensile strength of the cable while preventing tensile damage to the photoelectric composite cable core. This solves the core problems of easy breakage under high tensile force, breaking force attenuation, photoelectric signal attenuation, and structural instability. Furthermore, the outermost wear-resistant and weather-resistant outer sheath enhances the cable's wear and weather resistance, enabling it to adapt to harsh working conditions such as high altitudes and outdoor environments.

[0019] Meanwhile, by filling the gap between the high-strength load-bearing core, the photoelectric composite cable core, and the inner binding and isolation layer with tensile buffer and water-blocking filler, and in conjunction with the overall binding and constraint effect of the inner binding and isolation layer, the cable structure is effectively compacted, preventing the photoelectric composite cable core from shifting or misaligning between layers during repeated bending and dragging. This significantly improves the cable's resistance to compression, torsional deformation, and structural stability, thereby effectively solving the problems of mutual constraints between the tensile performance and photoelectric transmission performance of traditional moored cables, loose structure, weak load-bearing capacity, and short service life in harsh environments. It can stably adapt to high-load and high-reliability special operation scenarios such as high-altitude mooring, deep-sea towing, and heavy-duty airborne suspension. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the optoelectronic composite tethered cable provided by the present invention.

[0022] Explanation of reference numerals in the attached diagram: 1. High-strength load-bearing core; 2. Conductive power supply core; 3. Insulation layer; 4. Single-mode optical fiber body; 5. Loose tube of optical fiber; 6. Inner layer of bundled isolation layer; 7. Tensile buffer water-blocking filler; 8. Tensile buffer water-blocking layer; 9. Outer semi-conductive isolation layer; 10. Axial ultra-strong tensile layer; 11. Metal lightning discharge layer; 12. Wear-resistant and weather-resistant outer sheath. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a photoelectric composite tethered cable that solves the problems of traditional tethered cables having mutually restrictive tensile and photoelectric transmission performance, loose structure, weak load-bearing capacity, and short service life in harsh environments.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1 As shown, this embodiment provides a photoelectric composite tethered cable, including a central high-strength load-bearing core 1, a photoelectric composite cable core, an inner binding and isolation layer 6, an axial ultra-high tensile strength layer 10, and a wear-resistant and weather-resistant outer sheath 12. The photoelectric composite cable core is arranged around the outside of the central high-strength load-bearing core 1. The inner binding and isolation layer 6 wraps around the outside of the photoelectric composite cable core. The gaps between the central high-strength load-bearing core 1 and the photoelectric composite cable core, as well as the gaps between the photoelectric composite cable core and the inner binding and isolation layer 6, are filled with tensile buffer water-blocking filler 7. The axial ultra-high tensile strength layer 10 wraps around the outside of the inner binding and isolation layer 6, and the wear-resistant and weather-resistant outer sheath 12 wraps around the outside of the axial ultra-high tensile strength layer 10.

[0027] In this embodiment, the central high-strength load-bearing core 1 serves as the core main load-bearing structure, positioned at the geometric center of the cable. It possesses ultra-high axial tensile strength, tensile deformation resistance, and fracture resistance. The gaps between the optoelectronic composite cable cores are filled with tensile-resistant buffer water-blocking filler 7 to further disperse tensile force and buffer impact. An outer layer of axially ultra-strong tensile layer 10 is provided to form a secondary reinforced load-bearing structure. The dual-layer load-bearing structure works synergistically to significantly improve the overall breaking strength of the cable. That is, by adopting an independent central load-bearing structure plus an outer axial composite tensile double-layer ultra-strong load-bearing structure, the optoelectronic composite cable core is completely isolated from the load-bearing structure, maximizing the overall axial breaking tensile force of the cable while preventing tensile damage to the optoelectronic composite cable core. This solves the core problems of easy breakage under high tensile force, breaking force attenuation, optoelectronic signal attenuation, and structural instability. Furthermore, the outermost wear-resistant and weather-resistant outer sheath 12 enhances the cable's wear resistance and weather resistance, enabling it to adapt to harsh working conditions such as high altitude and outdoor environments.

[0028] Meanwhile, by filling the gap between the high-strength load-bearing core 1, the photoelectric composite cable core, and the inner binding and isolation layer 6 with tensile buffer water-blocking filler 7, and in conjunction with the overall binding and constraint effect of the inner binding and isolation layer 6, the cable structure is effectively compacted, preventing the photoelectric composite cable core from shifting or the layers from misaligning during repeated bending and dragging. This significantly improves the cable's resistance to compression, torsional deformation, and structural stability, thereby effectively solving the problems of mutual constraints between the tensile performance and photoelectric transmission performance of traditional moored cables, loose structure, weak load-bearing capacity, and short service life in harsh environments. It can stably adapt to high-load and high-reliability special operation scenarios such as high-altitude mooring, deep-sea towing, and heavy-duty airborne suspension.

[0029] The optoelectronic composite cable core includes a single-mode optical fiber unit and multiple conductive power supply units. The multiple conductive power supply units are arranged around the outside of the central high-strength load-bearing core 1. The inner layer of the binding and isolation layer 6 is wrapped around the outside of the multiple conductive power supply units. The single-mode optical fiber unit is located between the conductive power supply unit and the inner layer of the binding and isolation layer 6.

[0030] The single-mode fiber unit and multiple conductive power supply units are independently sealed and isolated after being filled with tensile buffer water-blocking filler 7. The tensile force is entirely borne by the load-bearing structure. The single-mode fiber unit and multiple conductive power supply units are not subject to external forces, have no tensile deformation, no breakage, and no signal attenuation, and the power and optical signals are transmitted stably for a long time.

[0031] Specifically, the conductive power supply units are arranged symmetrically in pairs relative to the central high-strength load-bearing core 1, with 2 to 4 sets of conductive power supply units.

[0032] In this specific embodiment, the conductive power supply unit is set to 3 groups, that is, the conductive power supply unit is set to 6 units.

[0033] The single-mode fiber unit includes a single-mode fiber body 4 and a loose fiber tube 5 sleeved outside the single-mode fiber body 4. Water-blocking buffer grease is filled between the single-mode fiber body 4 and the loose fiber tube 5.

[0034] The loose tube 5 provides basic mechanical protection for the single-mode fiber body 4. The water-blocking buffer grease acts as a flexible buffer, mitigating external force friction and compression caused by vibration and bending, reducing bending loss of the single-mode fiber body 4. Simultaneously, it achieves longitudinal water blocking, preventing moisture from intruding and damaging the single-mode fiber body 4. Furthermore, the water-blocking buffer grease can accommodate the thermal expansion and contraction differences between the single-mode fiber body 4 and the loose tube 5, ensuring stable optical transmission performance of the single-mode fiber body 4 under complex environments and improving the reliability and service life of the single-mode fiber unit.

[0035] In this specific embodiment, the optical fiber loose tube 5 is a stainless steel loose tube.

[0036] The conductive power supply unit includes a conductive power supply core wire 2 and an insulating layer 3 wrapped around the conductive power supply core wire 2. Specifically, the conductive power supply core wire 2 is made of multiple strands of silver-plated fine copper wire, and the insulating layer 3 is made of cross-linked polyethylene, which makes the conductive power supply unit insulating, voltage-resistant, and tensile-resistant.

[0037] In this embodiment, the inner binding and insulating layer 6 is an inner semi-conductive insulating layer. Specifically, the inner semi-conductive insulating layer is made of inner semi-conductive tape. During the manufacturing process, the inner semi-conductive tape is wrapped around the outside of the optoelectronic composite cable core in double layers with an overlap rate of ≥50%, tightly binding the inner optoelectronic composite cable core and preventing displacement or stretching of the optoelectronic composite cable core.

[0038] The inner semi-conductive isolation layer achieves potential equalization and uniform internal electric field, preventing local electric field concentration in the optoelectronic composite cable core from causing partial discharge. At the same time, it also acts as a binding and isolation layer, smoothing the outer surface of the optoelectronic composite cable core and isolating the optoelectronic composite cable core from the outer sheath, preventing the outer sheath from directly rubbing or squeezing and damaging the optoelectronic composite cable core.

[0039] This embodiment also includes a tensile buffer water-blocking layer 8, which is wrapped around the outside of the inner binding isolation layer 6.

[0040] The tensile buffer water-blocking layer 8 serves as a buffer and vibration damping layer. Specifically, it absorbs the mechanical stress generated by cable bending, dragging, and impact, disperses external extrusion pressure, reduces the stress transmitted inward to the optoelectronic composite cable core, and avoids micro-bending loss in the optoelectronic composite cable core. It also serves as a water-blocking layer, specifically preventing water from penetrating and corroding the optoelectronic composite cable core. Furthermore, it assists in sharing the tensile force, specifically working with the outer tensile structure to bear part of the axial tensile force, reducing the stress on the internal optoelectronic composite cable core.

[0041] This embodiment also includes an outer semi-conductive isolation layer 9, which is wrapped around the outside of the tensile buffer water-blocking layer 8, and an axial ultra-strong tensile layer 10 is wrapped around the outside of the outer semi-conductive isolation layer 9.

[0042] The outer semiconductive isolation layer 9 works in conjunction with the inner semiconductive isolation layer to form an insulating buffer area between the two layers, regulate the electric field distribution, and improve the internal electrical shielding structure; it isolates the inner tensile buffer water-blocking layer 8 from the outer axial ultra-strong tensile layer 10, preventing rigid tensile components from scratching the inner structure; it continuously conducts static charge at the interface, reducing the risk of interlayer interface polarization and discharge.

[0043] Specifically, the outer semi-conductive isolation layer 9 is made of an outer semi-conductive strip. During the manufacturing process, the outer semi-conductive strip is wrapped around the outside of the tensile buffer water-blocking layer 8 in double layers.

[0044] This embodiment also includes a metal lightning protection layer 11, which is wrapped around the outside of the axially strong tensile layer 10, and a wear-resistant and weather-resistant outer sheath 12 is wrapped around the outside of the metal lightning protection layer 11.

[0045] The metallic lightning discharge layer 11 serves to discharge lightning. Specifically, when encountering lightning strikes or induced overvoltages, it acts as a low-impedance discharge channel to quickly divert lightning current and induced charges to the ground, preventing lightning energy from intruding into the internal optoelectronic composite cable core and causing structural damage. It also serves as an electromagnetic shield, effectively shielding against external electromagnetic interference and internal electromagnetic fields, thus improving the electromagnetic compatibility of the cable. Furthermore, it serves as a mechanical protection, possessing certain resistance to pressure and impact, thereby enhancing the overall resistance of the cable to external force damage.

[0046] In this specific embodiment, the central high-strength load-bearing core 1 is a carbon fiber stranded core impregnated with high-temperature resistant epoxy resin. The central high-strength load-bearing core 1 uses a multi-strand carbon fiber stranded core, which is impregnated with high-temperature resistant epoxy resin and cured. After the high-temperature resistant epoxy resin is applied, the multi-strand carbon fiber stranded core is bonded together as a whole, which works together to bear tensile force and improve tensile strength and high-temperature resistance. At the same time, relying on the carbon fiber stranded structure, the outer wall of the central high-strength load-bearing core 1 forms an uneven surface, which increases the interfacial friction between it and the tensile buffer water-blocking filler 7, effectively suppressing the relative slippage between the central high-strength load-bearing core 1 and the surrounding optoelectronic composite cable core under the action of external force, better distributing the axial tensile force and protecting the optoelectronic composite cable core.

[0047] In this embodiment, the central high-strength load-bearing core 1 has a dense and rigid structure, bearing most of the axial tensile force of the cable, thus preventing stress on the internal optoelectronic composite cable core from the source and eliminating tensile damage to the single-mode optical fiber body 4 and the conductive power supply core 2.

[0048] Specifically, the high-strength load-bearing core 1 in the center adopts a core body of 12,000 strands of ultra-high-strength carbon fiber stranded together. The surface of the fiber bundle is uniformly impregnated with high-temperature resistant epoxy resin and cured. The roundness of the core body is ≥98%, and the axial tensile elastic modulus is ≥400GPa.

[0049] In this specific embodiment, the axial ultra-high tensile layer 10 is a bidirectional cross-woven composite layer of ultra-high molecular weight polyethylene fiber and high-strength silver-plated copper wire, with a weaving density of 98%, forming a rigid + flexible composite ultra-high tensile layer, which improves the overall resistance to breakage and tearing of the cable. Specifically, the high-strength silver-plated copper wire is a high-strength silver-plated fine copper wire.

[0050] Specifically, the thickness of the bidirectional cross-braided layer of ultra-high molecular weight polyethylene fiber and high-strength silver-plated copper wire is ≥1mm, forming a fully wrapped axial tensile bearing structure, which maximizes the overall breaking tensile strength of the cable.

[0051] In this specific embodiment, the wear-resistant and weather-resistant outer sheath 12 is made of polyurethane elastomer sheath material through extrusion molding. It is tensile-resistant, wear-resistant, UV-resistant, hydrolysis-resistant, and low-temperature resistant, making it suitable for extreme outdoor environments such as high altitudes and deep seas.

[0052] In this specific embodiment, the tensile buffer water-blocking filler 7 is an aramid fiber mixed water-blocking yarn flame-retardant filler that fills the gaps in the optoelectronic composite cable core in all directions, dispersing the impact force and buffering the tensile impact force.

[0053] The cable in this embodiment has a concentric symmetrical circular structure with no eccentricity or gaps. The gaps are fully filled and the layers are tightly bonded, resulting in a dense and stable structure that is fatigue-resistant and bend-resistant. The axial breaking tensile strength is ≥500KN. After repeated stretching, bending, and long-term suspension tests, the single-mode fiber body 4 showed no attenuation, the conductive power supply core 2 showed no deformation, the cable body showed no breakage, and there was no interlayer misalignment. It fully meets the requirements of high-altitude tethered UAVs, deep-sea heavy equipment, and military tethered platforms for ultra-high tensile strength and long-term continuous operation. It has a very wide range of applications, and the processing technology is controllable, making it suitable for mass production.

[0054] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A photoelectric composite tethered cable, characterized in that, The cable includes a central high-strength load-bearing core, a fiber optic composite cable core, an inner tightening and insulating layer, an axial ultra-high tensile strength layer, and a wear-resistant and weather-resistant outer sheath. The fiber optic composite cable core is arranged around the outside of the central high-strength load-bearing core. The inner tightening and insulating layer wraps around the outside of the fiber optic composite cable core. The gaps between the central high-strength load-bearing core and the fiber optic composite cable core, as well as the gaps between the fiber optic composite cable core and the inner tightening and insulating layer, are filled with tensile-resistant, buffering, and water-blocking fillers. The axial ultra-high tensile strength layer wraps around the outside of the inner tightening and insulating layer, and the wear-resistant and weather-resistant outer sheath wraps around the outside of the axial ultra-high tensile strength layer.

2. The optoelectronic composite tethered cable according to claim 1, characterized in that, The optoelectronic composite cable core includes a single-mode optical fiber unit and multiple conductive power supply units. The multiple conductive power supply units are arranged around the outside of the central high-strength load-bearing core. The inner layer of the clamping and isolation layer is wrapped around the outside of the multiple conductive power supply units. The single-mode optical fiber unit is located between the conductive power supply unit and the inner layer of the clamping and isolation layer.

3. The optoelectronic composite tethered cable according to claim 2, characterized in that, The single-mode fiber unit includes a single-mode fiber body and a loose tube sleeved outside the single-mode fiber body, with water-blocking buffer grease filling the space between the single-mode fiber body and the loose tube sleeve.

4. The optoelectronic composite tethered cable according to claim 2, characterized in that, The conductive power supply unit includes a conductive power supply core wire and an insulating layer wrapped around the conductive power supply core wire.

5. The optoelectronic composite tethered cable according to claim 1, characterized in that, The inner binding isolation layer is an inner semi-conductive isolation layer.

6. The optoelectronic composite tethered cable according to claim 1, characterized in that, It also includes a tensile buffer water-blocking layer, which is wrapped around the outside of the inner binding isolation layer.

7. The optoelectronic composite tethered cable according to claim 6, characterized in that, It also includes an outer semi-conductive insulating layer, which is wrapped around the outside of the tensile buffer water-blocking layer, and the axial ultra-strong tensile layer is wrapped around the outside of the outer semi-conductive insulating layer.

8. The optoelectronic composite tethered cable according to claim 1, characterized in that, It also includes a metal lightning protection layer, which is wrapped around the outside of the axially strong tensile layer, and the wear-resistant and weather-resistant outer sheath is wrapped around the outside of the metal lightning protection layer.

9. The optoelectronic composite tethered cable according to claim 1, characterized in that, The high-strength load-bearing core at the center is a stranded carbon fiber core impregnated with high-temperature resistant epoxy resin.

10. The optoelectronic composite tethered cable according to claim 1, characterized in that, The axial ultra-high tensile strength layer is a bidirectional cross-woven composite layer of ultra-high molecular weight polyethylene fiber and high-strength silver-plated copper wire, and the wear-resistant and weather-resistant outer sheath is extruded from polyurethane elastomer sheath material.

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