Layered blending barrier instrument cable

Abstract

The utility model discloses a layered blending barrier instrument cable in the technical field of cables, which comprises a cable core and a plurality of multi-stranded wires which are mutually stranded, each multi-stranded wire comprises a plurality of insulated wire cores which are mutually stranded, and each insulated wire core comprises a conductor and an insulating layer which is extruded outside the conductor; the shielding layer wraps the cable core; the inner protection layer is extruded outside the shielding layer and comprises a high-density polyethylene layer, a layered blending layer and a nylon layer which are sequentially wrapped from inside to outside; the armor layer is wrapped outside the inner protective layer; the outer protective layer is extruded outside the armor layer; by means of the high-density polyethylene layer and the nylon layer, a good protection effect is provided, the environmental protection property is high, no harm is caused to soil and the surrounding environment, and a layered blending layer is formed between the high-density polyethylene layer and the nylon layer, so that the film has excellent micromolecule barrier property, permeation of gas or solvent can be effectively prevented, the permeation rate is greatly reduced, and the service life of the film is prolonged. The stability and safety of signal transmission are ensured, and the underground complex working environment can be dealt with easily.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, and particularly relates to a laminated blend barrier instrument cable. Background Art

[0002] With the development of new-generation communication technologies and the increasing demands, the communication and exchange among various industries have been continuously expanding. Under this background, to facilitate management, protection, and maintain the urban beauty, some signal transmission cables are laid underground. However, this method will expose the cables to the infiltration of water, other solvents, or pollutants into the interior of the cables, which will lead to the problem of decreased insulation performance and pose a safety hazard.

[0003] However, traditional waterproof or hydrocarbon cables cannot avoid molecular-level infiltration over a long time, and the heavy metal elements in lead-sheathed barrier cables will have a serious impact on the environment.

[0004] Therefore, how to design a cable with good anti-permeability performance to ensure the stability and safety of signal transmission, cope with the complex underground working environment, and have no serious impact on the environment is an urgent problem to be solved currently. Content of the Utility Model

[0005] The purpose of the utility model is to provide a laminated blend barrier instrument cable, which solves the technical problem of poor anti-permeability performance of the existing instrument cables.

[0006] The utility model discloses a laminated blend barrier instrument cable, including:

[0007] A cable core, including multiple stranded wires that are twisted together. The stranded wires include multiple insulated wire cores that are twisted together. The insulated wire core includes a conductor and an insulating layer extruded outside the conductor;

[0008] A shielding layer, wrapped outside the cable core;

[0009] An inner sheath, extruded outside the shielding layer, including a high-density polyethylene layer, a laminated blend layer, and a nylon layer wrapped in sequence from the inside to the outside;

[0010] An armor layer, wrapped outside the inner sheath;

[0011] An outer sheath, extruded outside the armor layer.

[0012] In this application, by setting the inner protective layer to include a high-density polyethylene layer, a laminated blend layer, and a nylon layer, good protection effects are provided by virtue of the excellent properties of the high-density polyethylene layer and the nylon layer, and it is highly environmentally friendly, causing no harm to the soil and the surrounding environment. Moreover, a laminated blend layer is formed between the two, thereby having excellent micromolecular barrier properties, effectively preventing the penetration of gases or solvents, greatly reducing the penetration rate, ensuring the stability and security of signal transmission, and calmly coping with the complex underground working environment.

[0013] Based on the above technical solution, the solution of this application can be further improved as follows:

[0014] Preferably, the laminated blend layer is formed by blending high-density polyethylene and nylon, and the nylon forms a multi-layered sheet structure in the high-density polyethylene matrix; with this solution, not only the thickness of the material is increased, but also an obstacle to the penetration of substances is formed at the molecular level, thereby effectively reducing the rate of molecular permeation.

[0015] Preferably, the nylon layer is a polycaprolactam layer; with this solution, it has excellent wear resistance, high temperature resistance, and corrosion resistance, can provide good mechanical property protection, and has a low water absorption rate, thus having a good water blocking effect to cope with the special environment where the cable is directly laid and buried in the soil.

[0016] Preferably, the shielding layer includes:

[0017] Multiple sub-shielding layers, each corresponding to and wrapping around the multi-stranded wire;

[0018] A main shielding layer, wrapping around the cable core;

[0019] An aluminum-plastic tape layer, wrapping around the main shielding layer; with this solution, sub-main shielding is adopted in the structure, so through the dual protection of sub-shielding and main shielding, the reflection and scattering of signals can be effectively reduced, the attenuation and distortion of signals can be decreased, and a composite shielding is formed through the aluminum-plastic tape layer. Furthermore, whether for low-frequency or high-frequency signals, it has a strong anti-interference ability, thereby ensuring the stable transmission of signals in a complex electromagnetic environment.

[0020] Preferably, both the sub-shielding layer and the main shielding layer are formed by braiding tinned copper wires, and the aluminum-plastic tape layer is formed by longitudinally winding an aluminum-plastic composite tape; with this solution, it has excellent electrical conductivity, flexibility, bendability, oxidation resistance, corrosion resistance, and moisture-proof and humidity-proof properties, extending the service life of the shielding layer and ensuring its long-term stable operation in a harsh working environment.

[0021] Preferably, the shielding layer further includes:

[0022] A polyester tape layer is wrapped between the cable core and the overall shielding layer; with this solution, it serves as a cushion for the overall shielding layer to prevent the braided wires in it from piercing other components.

[0023] Preferably, the armor layer is formed by winding steel wires; with this solution, the tensile strength, compressive strength, bending resistance, magnetic shielding effect, and high-temperature resistance of the cable are improved, the electromagnetic radiation of the cable itself is reduced, and damage caused by biting is effectively prevented, ensuring the safe operation of the cable.

[0024] Preferably, it further includes:

[0025] A non-woven tape layer is wrapped between the armor layer and the outer sheath layer; with this solution, it is used to tie the steel wires in the armor layer tightly.

[0026] Preferably, the conductor is a tinned round stranded conductor; the insulating layer is a cross-linked polyethylene material layer; the outer sheath layer is a rat and ant proof, mildew proof, and flame retardant polyvinyl chloride sheath layer; with this solution, it has excellent characteristics such as corrosion resistance, acid and alkali resistance, rat and ant proof, mildew proof, and high mechanical strength, and can withstand the soil environment and pressure, ground load, and external impact.

[0027] Preferably, the cable core further includes:

[0028] Filler, which is polypropylene mesh tear-resistant fiber and is filled in the stranding gaps of the multi-stranded wire; with this solution, the mechanical strength, durability, reliability, service life, and overall structural strength of the cable are improved, preventing the cable from deforming or being damaged under external pressure or load.

[0029] Through the above technical solutions, the following beneficial effects are achieved by the present utility model:

[0030] 1. In this application, by setting the inner sheath layer to include a high-density polyethylene layer, a laminated blend layer, and a nylon layer, good protection effects are provided by virtue of the excellent characteristics of the high-density polyethylene layer and the nylon layer, and it has high environmental friendliness and no harm to the soil and the surrounding environment. A laminated blend layer is formed between the two, thus having excellent micro-molecular barrier properties, effectively preventing the penetration of gas or solvent, greatly reducing the penetration rate, ensuring the stability and security of signal transmission, and being able to cope with complex underground working environments;

[0031] 2. In this application, by setting a partial shielding layer and an overall shielding layer, a partial and overall shielding structure is adopted, so that through the double protection of partial shielding and overall shielding, the reflection and scattering of signals can be effectively reduced, the attenuation and distortion of signals can be reduced, and a composite shielding is formed by the aluminum-plastic tape layer. Therefore, it has strong anti-interference ability for both low-frequency and high-frequency signals, ensuring the stable transmission of signals in a complex electromagnetic environment. Description of the Drawings

[0032] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0033] Figure 1 Structural schematic diagram of the laminated blend barrier instrument cable according to a specific embodiment of the present invention;

[0034] Figure 2 For Figure 1 Structural schematic diagram of the laminated blend layer in

[0035] Explanation of reference numerals:

[0036] 1. Cable core; 11. Stranded wire; 111. Insulated wire core; 1111. Conductor; 1112. Insulation layer; 12. Filler;

[0037] 2. Shielding layer; 21. Sub-screen layer; 22. Polyester tape layer; 23. Main-screen layer; 24. Aluminum-plastic tape layer;

[0038] 3. Inner sheath; 31. High-density polyethylene layer; 32. Laminated blend layer; 321. Flaky structure; 33. Nylon layer;

[0039] 4. Armor layer; 5. Non-woven tape layer; 6. Outer sheath. Specific embodiments

[0040] The following will describe in detail the embodiments of the technical solutions of the present invention with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0041] First of all, it should be noted that some orientation words involved in the following description to clearly illustrate the technical solutions of the present invention, such as "outer", "between", etc., are all meanings analogously obtained according to the normal orientation in the laminated blend barrier instrument cable. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention.

[0042] In this application, unless otherwise clearly specified and defined, the terms "installation" and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0043] To better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0044] Embodiment:

[0045] As Figure 1 shown, an embodiment of the present application discloses a layered blend barrier instrument cable, directly buried underground for signal transmission. Its specific structure includes: a cable core 1, a shielding layer 2, an inner sheath 3, an armor layer 4, and an outer sheath 6.

[0046] The cable core 1 includes a plurality of stranded wires 11 that are twisted together. The stranded wires 11 include a plurality of insulated wire cores 111 that are twisted together. The insulated wire cores 111 include a conductor 1111 and an insulating layer 1112, and the insulating layer 1112 is extruded outside the conductor 1111.

[0047] Exemplarily, the cable core 1 includes eight stranded wires 11, and one stranded wire 11 is arranged in the center, and the other seven stranded wires 11 are helically wound and twisted around it; however, it is not limited thereto, and the number can be less or more, and other twisting forms can also be used, without specific limitation.

[0048] Exemplarily, the stranded wire 11 includes two insulated wire cores 111, and the two insulated wire cores 111 are twisted against each other, and the colors of the insulating layers 1112 are also different to facilitate distinction; however, it is not limited thereto, and the number can be less or more, and other twisting forms can also be used, without specific limitation.

[0049] The shielding layer 2 is wrapped outside the cable core 1; it is used to reduce the reflection and scattering of signals, thereby reducing the attenuation and distortion of signals.

[0050] The inner sheath 3 is extruded outside the shielding layer 2 and includes a high-density polyethylene layer 31, a layered blend layer 32, and a nylon layer 33 that are sequentially wrapped from the inside to the outside.

[0051] The armor layer 4 is wrapped outside the inner sheath 3; it is used to protect the insulation and conductors inside the cable and prevent external physical forces from damaging the cable.

[0052] The outer sheath 6 is extruded outside the armor layer 4; it is used to provide mechanical protection and prevent damage to the cable caused by external physical damage and environmental impacts.

[0053] It should be noted that the high-density polyethylene layer 31 has the following advantages:

[0054] First, it has good insulation performance, can effectively block electric current, and reduce power loss; this enables it to provide reliable electrical performance and ensure the stability and security of signal transmission;

[0055] Second, it has excellent chemical corrosion resistance and can resist the erosion of many chemicals, such as acids, alkalis, brines, etc.; this enables it to maintain stable performance under complex environmental conditions (such as industrial facilities, chemical plants, etc.) and extend the service life of the cable;

[0056] Third, it has high mechanical strength and good wear resistance, can effectively resist external physical damage, such as pressure, tension, and impact, etc.; this enables it to play an important role in cable applications that require additional protection and protect the internal conductors and signal transmission components from damage;

[0057] Fourth, it has good processability and can be made into various shapes and sizes through extrusion or injection molding to meet the needs of different cable designs; compared with some other engineering plastics, its production cost is relatively low, making it cost-effective in cable manufacturing.

[0058] It should be noted that the nylon layer 33 has the following advantages:

[0059] First, it has good tensile strength and wear resistance, can effectively protect the internal conductors and other components of the cable from physical damage (such as stretching, bending, and impact, etc.); this enables it to provide reliable mechanical protection and effectively resist wear;

[0060] Second, it has good thermal stability and low thermal shrinkage, can maintain stable performance at higher temperatures, and improve the safety of the line;

[0061] Third, it has good chemical corrosion resistance and acid and alkali resistance, which enables it to maintain stable performance in harsh environments;

[0062] Fourth, it has good processing performance, is convenient for processing processes such as extrusion molding, and also has good flexibility and toughness, making the cable more flexible and convenient during installation and use;

[0063] Fifth, it has high environmental friendliness, has no harm to the soil and the surrounding environment, and meets the ROHS environmental protection requirements.

[0064] The utility model provides a good protection effect by setting the inner protective layer 3 to include a high-density polyethylene layer 31, a laminated blend layer 32, and a nylon layer 33. It has high environmental friendliness and causes no harm to the soil and the surrounding environment. Moreover, a laminated blend layer 32 is formed between the two, so that it has excellent micro-molecular barrier properties, effectively preventing the penetration of gases or solvents, greatly reducing the penetration rate, ensuring the stability and security of signal transmission, and being able to cope with the complex underground working environment.

[0065] In some embodiments, as Figure 2 shown, the laminated blend layer 32 is formed by blending high-density polyethylene (HDPE) and nylon (PA), and the nylon (PA) forms a multi-layered sheet structure 321 in the high-density polyethylene (HDPE) matrix.

[0066] During the extrusion process, by controlling the dispersion morphology of the barrier polymer, the nylon (PA) can exist in the form of multi-layered and mutually stacked sheet structures 321 in the high-density polyethylene (HDPE) matrix.

[0067] It can be understood that the above-mentioned sheet structure 321 not only increases the thickness of the material, but more importantly, forms a barrier to hinder the penetration of substances at the molecular level, thus effectively reducing the rate of molecular permeation, because the molecules must pass through multiple layers and multiple interfaces, and they will be hindered and delayed during this process.

[0068] In some embodiments, the nylon layer 33 is a poly-dodecanolactam layer, and its manufacturing material is poly-dodecanolactam (Polyamide 12). It has excellent wear resistance, high temperature resistance, and corrosion resistance, can provide good mechanical property protection, and has a low water absorption rate, thus having a good water blocking effect to cope with the special environment where the cable is directly laid and buried in the soil.

[0069] In some embodiments, as Figure 1 shown, the shielding layer 2 includes: a plurality of sub-shielding layers 21, a main shielding layer 23, and an aluminum-plastic tape layer 24. Among them, the plurality of sub-shielding layers 21 are respectively wrapped around the stranded wires 11; the main shielding layer 23 is wrapped around the cable core 1; the aluminum-plastic tape layer 24 is wrapped around the main shielding layer 23.

[0070] Through the above settings, sub-total shielding is adopted in the structure. Thus, through the double protection of sub-shielding and main shielding, the reflection and scattering of signals can be effectively reduced, the attenuation and distortion of signals can be reduced, and a composite shielding is formed through the aluminum-plastic tape layer 24. Furthermore, it has a strong anti-interference ability for both low-frequency and high-frequency signals, thereby ensuring the stable transmission of signals in a complex electromagnetic environment.

[0071] Specifically, both the split - screen layer 21 and the total - screen layer 23 are formed by braiding tinned copper wires.

[0072] The above - mentioned design has the following advantages:

[0073] First, its dense mesh structure and excellent electrical conductivity can effectively suppress electromagnetic interference, significantly reduce signal attenuation and noise interference, and improve the clarity and stability of signal transmission.

[0074] Second, the braided structure has good flexibility and bendability, can adapt to various complex installation environments and equipment shapes, and is convenient for construction and installation.

[0075] Third, a dense mesh structure is formed, effectively improving the physical strength and stability, and can withstand a certain amount of external force impact and extrusion, protecting the safety of the internal cable or equipment.

[0076] Fourth, after tin - plating treatment, a layer of antioxidant and corrosion - resistant protective layer is formed on the surface of the copper wire, which can resist oxidation and corrosion factors in the environment, extend the service life of the shielding layer 2, and ensure its long - term stable operation in harsh working environments.

[0077] Specifically, the aluminum - plastic tape layer 24 is formed by longitudinally winding an aluminum - plastic composite tape.

[0078] The above - mentioned design has the following advantages:

[0079] First, it has good moisture - proof and humidity - proof performance, can effectively protect the inside of the cable from the erosion of moisture and water, and extend the service life of the cable.

[0080] Second, the hot - melt aluminized layer in the structure provides good antioxidant and anti - corrosion capabilities, can better protect the cable, and prevent the inside from being oxidized or corroded.

[0081] Third, it has high tensile strength and tear strength, can withstand a certain amount of external force, enhance the mechanical strength of the cable, and prevent the cable from being damaged during laying and use.

[0082] In this embodiment, as Figure 1 shown, the shielding layer 2 further includes: a polyester tape layer 22, which is wrapped between the cable core 1 and the total - screen layer 23 and is used as a cushion layer for the total - screen layer 23 to prevent the braided wires therein from piercing other components.

[0083] In some embodiments, the armor layer 4 is formed by winding steel wires.

[0084] The above - mentioned design has the following advantages:

[0085] First, it significantly improves the tensile strength and compressive strength of the cable and can withstand greater mechanical stress.

[0086] Second, it increases the bending resistance of the cable and reduces cable damage caused by bending;

[0087] Third, it provides good magnetic shielding effect, effectively resists low-frequency interference, and ensures the stability of the transmitted signal;

[0088] Fourth, it reduces the electromagnetic radiation of the cable itself and generates less electromagnetic interference to the surrounding environment;

[0089] Fifth, it has good high-temperature resistance, can maintain stable electrical performance in high-temperature environments, and reduces cable failures caused by high temperatures;

[0090] Sixth, it can effectively prevent rats, termites, etc. from biting and damaging the cable, and ensure the safe operation of the cable;

[0091] Seventh, it can be applied to a variety of laying methods, especially suitable for direct burial laying in complex terrains such as rocky areas.

[0092] In this embodiment, as Figure 1 shown, it further includes: a non-woven tape layer 5, which is wrapped between the armor layer 4 and the outer sheath layer 6 and is used to tie the steel wires in the armor layer 4.

[0093] In some embodiments, the conductor 1111 is a tinned round stranded conductor; it is a round conductor formed by stranding multiple copper wires plated with a tin layer according to certain rules, and has the advantages of compact structure, low resistivity, good electrical conductivity, etc. Moreover, due to the existence of the tin plating layer, it also has certain corrosion resistance and oxidation resistance, ensuring the service life; and has good flexibility and bendability, facilitating bending and installation, and at the same time improving the tensile strength of the conductor, thus facilitating underground laying.

[0094] In some embodiments, the insulation layer 1112 is a cross-linked polyethylene material layer; it has excellent heat resistance, insulation, mechanical properties and chemical resistance, and can withstand a relatively high instantaneous short-circuit temperature, thereby improving the service life of the cable.

[0095] In some embodiments, the outer sheath layer 6 is a rat-antifungal-mold-proof flame-retardant polyvinyl chloride sheath layer; it combines multiple characteristics such as rat-antifungal, mold-proof, and flame-retardant, better meets the usage requirements in the soil, and thus extends the service life of the cable.

[0096] In some embodiments, as Figure 1As shown, the cable core 1 further includes: a filler 12, which is a polypropylene mesh tearing fiber and is filled in the cabling gap of the stranded wire 11. It is used to fill the voids and spaces inside the cable, making the cable structure more compact and uniform, helping to maintain the stable positions of the wire harnesses or components inside the cable, and being able to reduce the movement and vibration of the cable during transportation and installation, improving the mechanical strength and durability of the cable. It can also serve as an isolating agent between the insulating layers 1112 to prevent direct contact and potential wear between the insulating layers 1112, thereby improving the reliability and service life of the cable. It can also enhance the overall structural strength of the cable and prevent the cable from deforming or being damaged under external pressure or load.

[0097] In the description of the present utility model, a large number of specific details are illustrated. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0098] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0099] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model, and they should all be covered by the scope of the claims and the specification of the present utility model.

Claims

1. A laminated blend barrier instrument cable, characterized in that, Comprising: A cable core (1), comprising a plurality of stranded multi-strands (11) twisted with each other, each of the multi-strands (11) comprising a plurality of insulated cores (111) twisted with each other, and each of the insulated cores (111) comprising a conductor (1111) and an insulating layer (1112) extruded outside the conductor (1111); A shielding layer (2), wrapped outside the cable core (1); An inner sheath layer (3), extruded outside the shielding layer (2), comprising a high-density polyethylene layer (31), a laminated blend layer (32), and a nylon layer (33) wrapped in sequence from inside to outside, and the laminated blend layer (32) having a plurality of sheet-like structures (321) inside; An armor layer (4), wrapped outside the inner sheath layer (3); An outer sheath layer (6), extruded outside the armor layer (4).

2. The laminated blend barrier instrument cable according to claim 1, characterized in that, The laminated blend layer (32) is formed by blending high-density polyethylene and nylon, and the nylon forms a plurality of the sheet-like structures (321) in the high-density polyethylene matrix.

3. The laminated blend barrier instrument cable according to claim 1, characterized in that, The nylon layer (33) is a poly-dodecanolactam layer.

4. The laminated blend barrier instrument cable according to claim 1, wherein The shielding layer (2) comprises: A plurality of sub-shielding layers (21), each wrapped outside one of the multi-strands (11) in a one-to-one correspondence; A main shielding layer (23), wrapped outside the cable core (1); An aluminum-plastic tape layer (24), wrapped outside the main shielding layer (23).

5. The laminated blend barrier instrument cable according to claim 4, characterized in that, Both the sub-shielding layer (21) and the main shielding layer (23) are formed by braiding tinned copper wires, and the aluminum-plastic tape layer (24) is formed by longitudinally winding an aluminum-plastic composite tape.

6. The laminated blend barrier instrument cable according to claim 5, characterized in that, The shielding layer (2) further comprises: A polyester tape layer (22), wrapped between the cable core (1) and the main shielding layer (23).

7. The laminated blend barrier instrument cable according to claim 1, characterized in that, The armor layer (4) is formed by winding steel wires.

8. The laminated blend barrier instrument cable according to claim 6, wherein, Further comprising: A non-woven tape layer (5), wrapped between the armor layer (4) and the outer sheath layer (6).

9. The laminated blend barrier instrument cable according to claim 1, wherein, The conductor (1111) is a tinned round stranded conductor; the insulating layer (1112) is a cross-linked polyethylene material layer; the outer sheath layer (6) is a rat-and-ants-proof, mildew-proof, and flame-retardant polyvinyl chloride sheath layer.

10. The laminated blend barrier instrument cable according to claim 1, characterized in that, The cable core (1) further comprises: A filler (12), which is a polypropylene mesh tearing fiber and is filled in the cabling gap of the multi-strands (11).

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