KR20140146374A - control signal transmission cable - Google Patents

Abstract

A control signal transmission cable is disclosed. According to the control signal transmission cable of the present invention, it is possible to improve the productivity of the cable by lowering the disconnection probability to the braiding process, to maintain the workability and shielding performance of the braid, to secure the flexibility of the cable braid, The unit price can be lowered. In addition, it is possible to improve the workability of the copper strip welding of the coarse aluminum wire rod and to reduce the weight of the cable, thereby ensuring convenience in transportation and installation work.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control signal transmission cable, and more particularly, to a control signal transmission cable capable of improving weight and flexibility and ensuring cost reduction and ease of operation while ensuring shielding performance.

Due to the recent rise in international copper prices and the rise in raw material prices, the cost of purchasing copper, which is the main material of cable conductors and braiding, has increased so much that copper can be substituted for copper in terms of price and performance The need for materials is increasing.

The biggest problem in the development of alternative materials is that it is difficult to obtain a material with electrical properties equivalent to that of copper, but with sufficient mechanical and physical properties to provide sufficient reliability for use with cable conductors and braids.

That is, in the development of cable conductors and braided materials, whether or not the mechanical and physical characteristics have sufficient reliability to be used for the cable, while having a level of conductivity equal to or satisfactory to copper, is a standard of product design. Research is underway to develop and cable applications.

Copper, which has been used most often as a cable braiding material, has been used as a main material for a long time due to its high conductivity and low price, which are optimal conditions for cable materials.

However, as copper prices have risen more than three times as a result of rising raw material prices, research is underway to use aluminum, which is less expensive and less expensive than copper, as a braided material.

However, since aluminum has lower electrical properties than copper and has lower physical properties, particularly elongation and strength, it has a problem that it is difficult to meet the characteristic that wire breakage does not occur in a severe braiding process as compared with a twisting process of a conductor. In the case of the aluminum alloy, although it exhibits physical characteristics similar to those of copper according to the alloy series, it has a problem that it is difficult to apply because the workability is reduced and the manufacturing cost is increased in the drawing process.

An alternative to this is the copper clad aluminum wire (CCA), which is a type of wire wrapped around an aluminum rod with a copper strip. The electrical properties of copper-coated aluminum wire are investigated as an alternative to copper as a composite material because they are located between the properties of copper and aluminum and can solve some of the low physical properties compared to copper, which is one of the biggest problems in aluminum application .

The properties of copper wire which is lower than copper when used as a cable material are largely determined by the electrical conductivity and mechanical properties, and the electrical properties can be solved by increasing the cross-sectional area by the resistance formula. In other words, copper wire has a larger wire resistance than copper, so that copper wire has a larger diameter than copper in order to have the same resistance.

Therefore, considering the increase and decrease of the wire resistance and the outer diameter and the weight, the copper and aluminum alloy volume ratio of the wire used for braiding must be carefully determined.

When the copper wire is used for knitting, the mechanical properties of the wire are particularly low, and the tensile strength is low. Therefore, there is a high probability that disconnection occurs in the braiding process. Even if the braiding process is carried out safely, There is a high possibility that disconnection occurs during the use of the cable.

In addition, since the copper alloy wire rod is not suitable for the existing braiding system set on the basis of the mechanical characteristics of copper, there is a high possibility of disconnection compared with the copper wire rod, and productivity is lowered when the braided wire speed is lowered to prevent disconnection.

On the other hand, in the finished products which have been subjected to this braiding process, it is necessary to have a flexibility equal to or higher than that of copper as the braiding of the cable, and the braiding should not be deformed or broken in the cable laying work.

Specifically, it should be good in peeling and loosening for connection and loosening during construction. Especially, flexibility is a very important characteristic, and it is a characteristic that directly affects the workability of the operator during cable installation.

Furthermore, copper aluminum wires have relatively low electrical properties compared to copper due to the limitations of composites. Therefore, when used as a power conductor, low conductivity may be a problem, and when the purpose of cable braiding is electromagnetic shielding, there may be a problem that the shielding rate is lower than that of braided wiring.

Therefore, in order to utilize copper alloy wire as a cable braid, many factors such as the ratio of copper to aluminum alloy content, composition ratio of aluminum alloy, mechanical strength, elongation, flexibility and electrical characteristics should be technically considered. The necessity of a copper aluminum wire which can be utilized as a cable material is emerging.

Embodiments of the present invention seek to improve the cable productivity by lowering the disconnection probability in the braiding process and to maintain the workability and shielding performance of the braid.

In addition, we aim to secure the flexibility of cable braiding and to lower manufacturing costs by lowering material and processing costs.

In addition, the copper strip welding workability of the copper aluminum wire is improved, and the weight of the cable is reduced to ensure the convenience of transportation and laying work.

According to an aspect of the present invention, there is provided a control signal transmission cable comprising: a plurality of signal transmission units each having a conductor layer formed by twisting, aggregating, or compounding a plurality of element wires; and an insulation layer insulating the conductor layer; And a braid layer formed outside the plurality of signal transmission units and performing at least one function of shielding, grounding, or strength reinforcement, wherein the braid layer comprises an extension made of an aluminum alloy and an outer line made of copper surrounding the extension Wherein the coarse aluminum wire has a wire diameter of not more than 0.16 mm and a wire load of not less than 0.077, and the surface of which is plated with tin. Can be provided.

Here, it is preferable that the braiding density of the braided layer is 70% or more.

In addition, a separator tape surrounding the conductive layer may be provided, and the insulation layer may be formed by extruding the separator tape so as to surround the separator tape.

Further, the control signal transmission cable according to the present invention further comprises a filler filled to maintain a circular shape between the plurality of signal transmission units, and a binder tape surrounding the plurality of signal transmission units and the periphery of the filler, The plurality of signal transmission units, the filler and the binder tape can form the core portion.

Meanwhile, the control signal transmission cable according to the present invention may further include an inner sheath layer disposed between the core part and the braided layer and surrounding the core part.

Further, the control signal transmission cable according to the present invention may further include an outer sheath layer surrounding the outer side of the braided layer.

Embodiments of the present invention can reduce the disconnection probability in the braiding process to improve the cable productivity and maintain the workability and shielding performance of the braid.

In addition, flexibility of cable braiding can be ensured and manufacturing cost can be reduced by lowering the material cost and the processing cost.

In addition, it is possible to improve the workability of the copper strip welding of the coarse aluminum wire rod and to reduce the weight of the cable, thereby ensuring convenience in transportation and installation work.

1 is a view showing a process of manufacturing a coarse aluminum wire according to an embodiment of the present invention;
FIG. 2 is a perspective view showing a cable to which a flat copper wire for flat knitting according to an embodiment of the present invention is applied.
3 is a cross-sectional view illustrating a cable to which a flat copper aluminum wire according to an embodiment of the present invention is applied
FIG. 4 is a perspective view showing a cable to which a flat copper wire for flat knitting according to another embodiment of the present invention is applied.
5 is a cross-sectional view showing a cable to which a flat copper aluminum wire according to another embodiment of the present invention is applied
6 is a perspective view showing a cable to which a flat copper wire for flat knitting according to another embodiment of the present invention is applied;
7 is a cross-sectional view showing a cable to which a copper aluminum wire for flat knitting according to another embodiment of the present invention is applied

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

1 is a view illustrating a process of manufacturing a coarse aluminum wire according to an embodiment of the present invention.

Referring to FIG. 1, a flat copper aluminum wire 10 according to an embodiment of the present invention includes an extension wire 12 made of an aluminum alloy, and an outer wire 14 surrounding the extension wire and made of copper have.

The flat copper aluminum wire 10 for braiding may be made of copper having an inner side made of an aluminum alloy and an outer side occupying a volume of 8% to 17%. As shown in FIG. 1, an aluminum wire 12 made of an aluminum alloy surrounds an outer circumferential surface 14 made of copper and welded to produce an aluminum flat wire 10 for flattening.

Here, the extension 12 may be made of an aluminum alloy, and may be composed of a composition element of AL (aluminum), Fe (iron), Cu (copper), Mg (magnesium), Si (silicon) And other impurities.

The process for producing the aluminum alloy extensions 12 will be described in detail with reference to a process for producing the aluminum alloy extensions 12 using aluminum (Al), Fe (iron), Cu (copper), Mg (magnesium), Si (silicon) After the alloying material is prepared, it can be finished in a cold state to the desired shape and outer diameter.

Particularly, in the present invention, a non-heating alloy such as AA1000 series aluminum alloy having high purity (99% or more) and AA5000 series aluminum alloy of Al-Mg series can be used as the extension 12.

AA1000 series aluminum alloys are characterized by low strength, but they are excellent in workability, corrosion resistance, surface treatment, electrical conductivity and heat conductivity, and are widely used as materials for transmission and distribution and heat dissipation materials. Therefore, it is generally preferable to apply the AA1000 series aluminum alloy for the conductor or flattening of a cable which should exhibit good electrical characteristics.

In addition, AA5000 series aluminum alloys show good mechanical properties instead of low conductivity, so they are widely used as structural materials and have many kinds of alloys. The AA5000 series aluminum is characterized by relatively high strength and elongation at the same conditions and is resistant to the pollution atmosphere in seawater or industrial area, so it is desirable to apply it to cables that can take advantage of these characteristics.

Therefore, when the conductivity is important, a copper aluminum wire rod capable of securing a conductivity of 65% to 70% by using an AA1000 series aluminum alloy having high purity is used, and when mechanical characteristics are important, an AA5000 series aluminum alloy is applied It is possible to use a coarse aluminum wire which can reinforce the tensile strength and secure a conductivity of 35% or more.

Particularly, it is possible to determine whether or not to apply the AA1000 series or AA5000 series aluminum alloy according to the size of the small copper wire 10 (see Fig. 2 to Fig. 7) of the fabricated flat copper alloy wire 10, It is preferable to apply the AA1000 series as the smaller the diameter (a) is larger.

More specifically, when the AA5000 series is applied, AA5005, AA5050, AA5052, and AA5154 among the aluminum alloys can be mainly used. In this case, the extensions 12 have an aluminum weight ratio of 94.45% or more, a magnesium weight ratio of 0.5% to 3.9% Aluminum alloy. Of course, it is also possible to use other kinds of aluminum alloys among AA5000 series aluminum alloys.

In the case of applying the AA1000 series, AA1070, AA1350, etc. among the aluminum alloys can be mainly used. In this case, the extensions 12 may be made of an aluminum alloy having an aluminum weight ratio of 99.5% or more. Of course, it is also possible to use other kinds of aluminum alloys among AA1000 series aluminum alloys.

In addition, the minimum wire load of the copper flat aluminum wire 10, which does not break in accordance with the equipment used in the braiding operation of copper, is 0.077 (Kgf), which is smaller than the AA5000- In the case of applying the external wire 14 to copper of 5% by volume.

That is, if a strand load of at least 0.077 Kgf is secured even in a small diameter wire (a) of 0.16 mm or less, the braiding process can be carried out by using the copper wire material (10) And AA5000 series or AA1000 series aluminum can be selectively applied according to specific small diameter (a) to have a wire load greater than 0.077 Kgf.

As described above, the copper outer wire 14, that is, the copper strip, surrounding the extension wire 12 of the copper coarse aluminum wire rod 10 according to the embodiment of the present invention, ) To a total volume of 8% to 17%.

That is, the volume ratio of copper in the copper foil aluminum wire 10 for knitting is preferably 8% to 17% of the total volume, and exhibits good characteristics within the range.

The reason for this is that the mechanical characteristics of the copper flat copper aluminum wire 10 generally have a characteristic of an aluminum alloy as a core material and a value of copper as a cladding material. When the volume ratio of copper is lower than 8% It is difficult to obtain a flexible characteristic. On the contrary, if the volume of copper is increased, the characteristic of the wire which is increased in price is inefficient. In consideration of the relationship with the compositional ratio of the above-described aluminum alloy, the copper volume ratio is preferably in the range of 8% to 17%.

1, a manufacturing process of the copper flat aluminum wire 10 for braiding is described in more detail. First, a rod made of an aluminum alloy, that is, an outer wire 12 made of a copper strip is wrapped around the outer wire 14, And welded with a TIG (Tungsten Inner Gas) welder 19.

At this time, the aluminum alloy of AA5000 series or the aluminum alloy of AA1000 series may be selectively made according to the given small wire diameter (a) so that the wire load of the flat copper aluminum wire 10 to be manufactured as described above may exceed the minimum value 0.077 Kgf To be applied.

More specifically, the welding is carried out in a welded part 17 which is shielded from the outside in the form of a box. Specifically, it is necessary to minimize the inflow of outside air, that is, oxygen, into the welded portion 17, and to minimize the outflow of Ar (argon) gas used for TIG welding.

At this time, the Ar gas is injected through the gas injector 18 so that the Ar gas is continuously filled therein. The reason for supplying the Ar gas is to prevent the occurrence of excessive arcing due to oxygen during the TIG welding and to further stabilize the welding, and to ensure that Ar gas is filled in the copper aluminum wire rod 10 for flatting after welding to be.

In addition, when oxygen is introduced into the inside of the aluminum alloy rod and the copper strip surface, oxidation occurs on the surfaces of the aluminum alloy rod and the copper strip, thereby delaying the cladding time.

Thereafter, the copper aluminum alloy wire 10 is wire drawn through a repetitive process of passing through the drawing die 40. The copper aluminum wire 10 for flattening a wire of a desired shape and diameter is drawn through a drawing process Can be obtained.

At this time, the fresh die 40 is provided with a die case 43 in the form of a cylindrical body. Inside the die case 43, a die tip 45 Can be fixedly installed.

When a wire rod having a large diameter enters through the wire rod inlet 47 of the die tip 45 having the above structure, the wire rod having a thinner diameter comes out through the wire rod outlet 49, The wire rod 10 can be made to have a desired shape and diameter and the bonding strength between the extensions 12 and the external wires 14 can be increased.

The copper foil aluminum wire 10 obtained by drawing can obtain a material required by a heat treatment process. In the present invention, heat treatment is performed by a continuous process.

The heat treatment method can be classified into various kinds according to the classification standard, and it can be classified into the continuous method and the fixed method depending on whether the material to be annealed is moved or not.

The continuous type is a method of adjusting the material by fixing the temperature and the passage time of the material, and it has a disadvantage of increasing the installation space, but it can easily satisfy the required physical characteristics. On the other hand, the batch method requires three steps of heating, holding, and cooling after charging the material, so it takes a long time and it is not easy to satisfy the physical characteristics.

In the present invention, a tubular furnace (50) is used. However, the heat treatment method is not limited, and a copper flat aluminum wire rod (10) for knitting can be manufactured by using another heat treatment machine.

Specifically, the heat treatment temperature according to the present invention can be performed at 220 to 560 ° C in order to remove the residual stress due to work hardening. The reason for the wide temperature range is that the heat treatment time And the small wire diameter (a) of the wrought copper aluminum wire 10 also functions as a large variable, so that the heat treatment temperature is limited within a wide range as described above.

 The aluminum wire rods 10 can be produced by winding the wire rods on the bobbin 60 after they are cooled by air cooling.

The flat copper aluminum wire 10 according to the present invention produced in this way can be applied to cables used in various fields, and in particular, it can be applied to a control signal transmission cable.

FIG. 2 is a perspective view illustrating a cable to which a copper aluminum wire for flatting according to an embodiment of the present invention is applied, FIG. 3 is a cross-sectional view illustrating a cable to which a copper aluminum wire for flatting according to an embodiment of the present invention is applied, 4 is a perspective view showing a cable to which a flat copper wire for flat knitting according to another embodiment of the present invention is applied. FIG. 5 is a cross-sectional view showing a cable to which a copper aluminum wire for flatting according to another embodiment of the present invention is applied, FIG. 6 is a perspective view showing a cable to which a copper aluminum wire for flatting according to another embodiment of the present invention is applied And FIG. 7 is a cross-sectional view illustrating a cable to which a flat copper wire for flat knitting according to another embodiment of the present invention is applied.

1 to 7, a control signal transmission cable 1000 according to the present invention, to which the above-described flat copper aluminum wire 10 is applied, includes a plurality of wires 20, A plurality of signal transmission units 110 having a layer 112 and an insulating layer 116 insulating the conductor layer 112 and a plurality of signal transmission units 110 formed outside the plurality of signal transmission units 110 for shielding, And a braided layer 140 that performs at least one function of strength reinforcement.

The conductor layer 112 may be formed of stranded wires 20 made of any one of copper, aluminum, aluminum alloy and copper aluminum wire stranded, gathered or combined.

A separator tape 114 may be provided on the outer side of the conductor layer 112 to surround the conductor layer 112. The separator tape 114 is not essential and can be omitted especially when the conductor layer 112 is made of fine wires.

When the separate tape 114 is provided, the insulating layer 116 may be extruded to surround the separate tape 114.

The insulating layer 116 is made of a material having an insulating property and an impact resistance property, and covers and protects and insulates the conductive layer 112.

Specifically, the insulating layer 116 may be formed of a material selected from the group consisting of silicone, cross-linked polyethylene (XLPE), crosslinked polyolefin (XLPO), ethylene-propylene rubber (EPR) Polyvinyl chloride (PVC), or a mixture thereof.

The conductor layer 112, the separate tape 114 and the insulating layer 116 constitute one signal transmission unit 110 and the control signal transmission cables 1000 and 1000-1 shown in FIGS. Three signal transmission units 110 may be provided as shown in FIG. 6 and FIG. 7, or two signal transmission units 110 may be provided like the control signal transmission cable 1000-2 shown in FIGS. 6 and 7, The number of the signal transmission cables 1000 may vary depending on the field to which the signal transmission cable 1000 is applied, the use environment, the use, and the like.

A filler 122 is filled between the plurality of signal transmission units 110 to maintain a circular shape and a binder tape 124 surrounding the plurality of signal transmission units 110 and the filler 122 surrounds the filler 122, May be provided. Here, the plurality of signal transmission units 110, the filler 122, and the binder tape 124 constitute the core unit 120.

The filler 122 functions to prevent circular penetration and gas penetration of the core 120, and is preferably made of a non-hygroscopic material.

The binder tape 124 is mainly made of a PET material but is not limited thereto. The binder tape 124 serves as a core fixing member fixing the shape at the outermost part of the core part 120.

The inner sheath layer 130 may be provided on the outer side of the core 120. The inner sheath layer 130 is used for the purpose of protecting the conductor layer 112 inside of the inner sheath layer 130 by absorbing an external impact but also for the purpose of flame retardation and the like. However, the inner sheath layer 130 is not an essential element in the control signal transmission cable 1000, 4 and the control signal transmission cable 1000-1 shown in Fig.

As the inner sheath layer 130, thermoplastic and thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene can be used.

A braided layer 140 may be provided on the outer side of the inner sheath layer 130. If the inner sheath layer 130 is omitted, the outer side of the core 120, i.e., the outer side of the semi-finished product or the insulating layer 116, Respectively.

As described above, the braided layer 140 is made of a coarse aluminum wire 10, which includes an extension wire 12 made of an aluminum alloy and an outer wire 14 surrounding the extension wire 12 and made of copper, . The copper volume ratio of the flat copper aluminum wire 10 may be 8% to 17%.

As the small wire diameter a of the coarse aluminum wire rod 10 is increased, the thickness of the braided layer 140 formed by weaving the wire increases, so that the entire outer diameter of the control signal transmission cable 1000 becomes large, do.

Therefore, it is preferable that the small wire diameter (a) of the coarse aluminum wire rod 10 is 0.16 mm or less, and the wire load of the coarse aluminum wire rod 10 is 0.077 ( Kgf) or more.

That is, if even a small wire diameter (a) of 0.16 mm or less can secure a minimum wire load of 0.077 Kgf, the braiding process can be performed by using the copper aluminum wire material (10) , AA5000 series or AA1000 series aluminum can be selectively applied to have a wire load greater than 0.077 Kgf according to specific small wire diameter (a).

It is preferable that the surface of the coarse aluminum wire rod 10 is plated with tin.

Here, the braided structure may be varied depending on the diameter of the braided object or the purpose of braiding, but in the present embodiment, the case where the braided structure is made of 7 brackets and 16 brackets is taken as an example. 7 will be put together. At this time, the braid layer 140 is woven at a braid density of 70% or more so as to maintain a shielding ratio of 40 dB or more.

The outer sheath layer 150 is provided at the outermost portion of the cable 1000 to protect the cable 1000 from external impact or corrosion. Like the inner sheath layer 130, the outer sheath layer 150 can be made of thermoplastic or thermosetting materials such as PVC, HF4-1, SHF1, and chloroprene.

The outer sheath layer 150 is not essential for the control signal transmission cable 1000 and may be omitted as an example of the control signal transmission cable 1000-2 shown in FIGS.

The aluminum copper wire for flatting according to the embodiments of the present invention and the control signal transmission cable manufactured by applying the same have the following effects.

First, the copper aluminum wire produced according to the conditions of the present invention has a low probability of occurrence of disconnection even when the braiding process is carried out in a facility set at the same level as the braiding level of the copper wire. This is because the manufacturing technique according to the present invention has been supplemented by the present invention so that the wire rod strength is maintained at a certain level or more, which is the biggest reason for the wire breakage in the braiding process.

In addition, when the process according to the present invention is applied, the elongation of 15% to 20% in AA1000 series and 8% to 12% in AA5000 series can be secured, and thus the product performance equivalent to copper You can expect.

Second, high twisting properties, tensile strength and flexibility can be secured. In actual cable installation, work is often done in an environment that simultaneously receives tensile force and torsion. In this case, the braid made by the suitable structure design according to the present invention has a lower strength than the copper braid made of the same small wire diameter, but in the environment where the cable is actually used, that is, in the case where tension and torsion are simultaneously applied at the time of installation, It has excellent properties and is excellent in flexibility.

Actually, when the copper alloy wire of the present invention was tested by using a braided cable, even when a twist of 8 degrees / m (80 degrees per 10 meters) and a tensile force of 100 kgf (980 N) were applied, it showed very good characteristics .

These results are very desirable results for securing reliability in actual product applications. This is also consistent with the results of simulation of the structural analysis of the coplanar aluminum wire and copper wire.

Third, it is possible to guarantee high convenience when the operator performs cable laying work. The cable to which the copper aluminum wire according to the present invention is applied by braiding is reduced to a level of less than half (AA1000 series: 49%, AA5000 series: 42%) in weight as compared with the case where copper is applied while exhibiting good characteristics as described above , It can be applied to ships or marine cables which are hand-operated and have a large bending environment. In addition, when folding or folding the braid for grounding, it is easier and easier to work than braid made of copper wire.

Fourth, since aluminum is 1/4 of the price of raw material compared to copper, the cost of conductors and braids to which copper alloy wire is applied is about one third to one half of that of copper wire. Accordingly, since the cost of the braid material is reduced to less than half, the cost of the cable as a whole is reduced, and the cost saving effect can be expected.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined in the appended claims. You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10: Flat knitted wire aluminum wire 20: Wire
112: conductor layer 116: insulating layer
130: Inner sheath layer 140: Braided layer
150: outer sheath layer 1000: control signal transmission cable

Claims (6)

A control signal transmission cable comprising:
A plurality of signal transmission units each having a conductor layer formed by stranding, aggregating, or compounding a plurality of wires, and an insulating layer insulating the conductor layer; And
And a braided layer formed outside the plurality of signal transmission units and performing at least one function of shielding, grounding, or strength reinforcement,
Wherein the braided layer is woven with a copper alloy wire (CCA) including an inner wire made of an aluminum alloy and an outer wire made of copper surrounding the inner wire, wherein the coarse aluminum wire has a wire diameter of 0.16 mm or less, Wherein the cable has a small wire load and the surface is plated with tin. The method according to claim 1,
Wherein the braided layer has a braid density of 70% or more. The method according to claim 1,
Wherein the insulation layer is formed by extruding the separator tape to surround the conductor layer, and the insulating layer is formed by extruding the separator tape so as to surround the separator tape. The method according to claim 1,
A filler filled to maintain a circular shape between the plurality of signal transmission units and a binder tape wrapping around the plurality of signal transmission units and the filler,
Wherein the plurality of signal transmission units, the filler, and the binder tape form a core portion. 5. The method of claim 4,
Further comprising an inner sheath layer disposed between the core and the braided layer and surrounding the core. The method according to claim 1,
And an outer sheath layer surrounding the outer side of the braided layer.

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