KR101961294B1 - Electric wave shielding cable for vehicle and fabrication method for the same - Google Patents

Abstract

An electromagnetic wave shielding cable for an automobile is provided. The electromagnetic wave shielding cable for an automobile according to the present embodiment includes a core made of a conductive material; An insulating layer surrounding the core; An electromagnetic wave shielding layer surrounding the insulating layer and having an electromagnetic wave shielding function; And a covering layer made of an insulating material surrounding the electromagnetic wave shielding layer; And the electromagnetic wave shielding layer includes a plurality of carbon fiber yarns coated with an electromagnetic wave shielding material. Therefore, the weight can be significantly reduced.

Description

TECHNICAL FIELD [0001] The present invention relates to an electromagnetic wave shielding cable for an automobile, and a method of manufacturing the same. BACKGROUND ART [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding cable for an automobile, and more particularly to an electromagnetic wave shielding cable for a vehicle including carbon fiber yarn.

Currently, the automobile industry is faced with the greatest upheaval due to global warming and depletion of resources. According to various market and technology trend data, global warming prevention technology and fuel efficiency improvement technology are reported to be the core technology to determine competitiveness in the future automobile market . As a response to global environmental regulations and fuel economy regulations on global warming, automakers are focusing on research for environmentally friendly and fuel-efficient automobiles.

The dual automobile lightweight technology is to replace the car body or parts with lightweight materials to increase the efficiency of the automobile by reducing the weight of the automobile to maximize the performance of the automobile, thereby improving the fuel efficiency of the automobile, . Automobile lightweighting technology can be divided into body weight reduction technology and lightweight automobile parts technology.

An electromagnetic wave shielding cable among automobile parts is used to prevent a malfunction or an accident of an automobile due to an electromagnetic interference, and it includes an insulation layer surrounding the core wire and the core wire, an electromagnetic wave shielding layer surrounding the insulation layer, Lt; / RTI > The double electromagnetic wave shielding layer shields electromagnetic waves and is generally known to be made of a conductive metal.

Therefore, the conventional electromagnetic wave shielding cable has a problem of increasing the weight of the automobile against the demand for reduction in weight of the automobile.

Further, the conventional electromagnetic wave shielding cable has a problem that it is difficult to install a cable because the electromagnetic wave shielding layer is made of metal and has low flexibility.

Japanese Unexamined Patent Publication No. 2002-538581 (published on November 12, 2002) Japanese Laid-Open Patent Application No. 2013-073987 (published on April 22, 2013)

The present invention been made in view of the above problems, specifically, is for flexible and lighter in weight to provide a good electromagnetic wave shield cable car electromagnetic wave shielding performance.

In order to solve the above-described problems, the present invention provides a core comprising a conductive material; An insulating layer surrounding the core; An electromagnetic wave shielding layer surrounding the insulating layer and having an electromagnetic wave shielding function; And a covering layer made of an insulating material surrounding the electromagnetic wave shielding layer; Wherein the electromagnetic wave shielding layer comprises an electromagnetic wave shielding thin film including a plurality of carbon fiber yarns coated with an electromagnetic wave shielding material.

The electromagnetic wave shielding layer preferably surrounds the insulating layer in an oblique direction along the surface of the insulating layer in the form of a thin film having a predetermined width and length.

In addition, a plurality of the carbon fiber yarns are arranged along the longitudinal direction in the width direction of the electromagnetic wave shielding thin film and are installed obliquely along the surface of the insulating layer.

It is effective that the electromagnetic wave shielding layer further includes an insulating film which is bonded to one surface of the electromagnetic wave shielding thin film and is surrounded by the coating layer.

The electromagnetic wave shielding thin film is preferably positioned between the core and the insulating film.

The material of the insulating film may be selected from the group consisting of polyvinyl chloride, polyvinyl chloride, crosslinked, polyethylene, polyamide, polytetrafluoroethylene, Examples of the thermoplastic polyurethane are fluorinated ethylene propylene, ethylenetetrafluoroethylene, polypropylene, polyvinylidene fluoride, perfluoroalkoxy copolymer, thermoplastic polyurethane ), Thermoplastic polyether polyurethane, thermoplastic polyether ester elastomer, thermoplastic polyether elastomer, thermoplastic polystyrene block, copolymer, thermoplastic A thermoplastic polyamide elastomer, a silicone rubber, and the like.

The electromagnetic wave shielding material includes at least one of nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), and magnesium (Mg).

Wherein the electromagnetic wave shielding layer comprises: a first electromagnetic wave shielding part including a first insulating film to which the first electromagnetic wave shielding thin film of the electromagnetic wave shielding thin film and the first electromagnetic wave shielding thin film are bonded; And a second electromagnetic wave shielding part including a second insulating film to which the second electromagnetic wave shielding thin film and the second electromagnetic wave shielding thin film of the electromagnetic wave shielding thin film placed on the first insulating film are bonded have.

The electromagnetic wave shielding material coated on the carbon fiber yarn may include an electroless plating layer coated on the carbon fiber yarn primarily by an electroless plating method; And an electrolytic plating layer coated on the electroless plating layer by an electrolytic plating method.

It is effective that the thickness of the electromagnetic wave shielding material is 0.21 μm or more and 0.3 μm or less.

Here, the electroless plating layer mainly contains copper, and the electroplating layer preferably contains nickel as a main component.

It is effective that the electric conductivity of the carbon fiber yarn coated with the electromagnetic wave shielding material is 6250 to 8930 S / cm.

As another category of the present invention, there is provided a method for manufacturing an electromagnetic wave shielding thin film for automobile which is coated with a carbon fiber yarn used in an electromagnetic wave shielding cable for an automobile with an electromagnetic shielding material.

The method for manufacturing an electromagnetic wave shielding thin film for automobile according to claim 1, further comprising: electroless plating the carbon fiber yarn in an electroless plating bath; Washing after the electroless plating step; Wherein the metal ion concentration in the electroless plating step is in the range of 2.5 to 3.0 g / L, and the metal ion concentration in the electroless plating step is 200 to 400 g / L .

It is effective that the electroless plating step, the water washing step and the electrolytic plating step are continuous processes, and the linear velocity of the carbon fiber yarn is 0.65 to 1.05 m / min in the continuous process.

According to an embodiment of the present invention, since a plurality of carbon fiber yarns are spread in the width direction of the electromagnetic wave shielding thin film and the electromagnetic wave shielding layer is composed of a plurality of lightweight carbon fiber yarns, it is possible to provide a thin electromagnetic wave shielding cable for automobile.

In addition, according to an embodiment of the present invention, since the plurality of carbon fiber yarns can be arranged in the width direction of the electromagnetic wave shielding thin film which is obliquely installed along the surface of the insulating layer and can be arranged along the length direction, It is possible to provide an excellent electromagnetic wave shielding cable for an automobile.

According to another embodiment of the present invention, even if the thickness of the electromagnetic wave shielding layer is increased, flexibility can be maintained and a lightweight electromagnetic wave shielding cable for an automobile can be provided.

In addition, according to the present embodiment, since the tape-shaped electromagnetic wave shielding layer having a certain width and length can easily surround the periphery of the insulating layer, it is easy to manufacture an electromagnetic wave shielding cable for an automobile, and productivity can be improved.

Further, according to another embodiment of the present invention, it is possible to provide an electromagnetic wave shielding cable for an automobile having an electromagnetic wave shielding function by double shielding.

1 is a perspective view showing an electromagnetic wave shielding cable for an automobile according to a first embodiment of the present invention;
Fig. 2 is a plan view schematically showing the electromagnetic wave shielding layer of the electromagnetic wave shielding cable for automobile of Fig. 1
FIG. 3 is a cross-sectional view of the electromagnetic wave shielding layer of FIG. 2 taken along line III-III
4 is a graph showing the shielding performance of an electromagnetic wave shielding cable composed only of carbon fiber yarn
5 is a graph showing the shielding performance of the electromagnetic wave shielding cable of the embodiment of the present invention in which carbon fiber yarn coated with copper and nickel as the electromagnetic wave shielding material is applied
6 is an enlarged cross-sectional view of the electromagnetic shielding material coated on the carbon fiber yarn and the carbon fiber yarn of FIG. 3
Fig. 7 is a graph showing the results of the flexibility test of the electromagnetic wave shielding cable for an automobile shown in Fig. 1
8 is a cross-sectional view of an electromagnetic wave shielding layer of an electromagnetic wave shielding cable for a vehicle according to a second embodiment of the present invention
FIG. 9 is a conceptual diagram showing steps of the method for manufacturing an electromagnetic wave shielding layer of the embodiment of the present invention.
10 is a block diagram sequentially showing steps of forming an electromagnetic wave shielding thin film by coating the carbon fiber yarn of FIG. 9 with an electromagnetic wave shielding material
Fig. 11 is a conceptual diagram showing the process of the spreading step of Fig. 9
12 is a schematic view briefly showing the step of forming the electromagnetic wave shielding layer in the form of the thin film tape of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

1 is a perspective view showing an electromagnetic wave shielding cable for an automobile according to a first embodiment of the present invention.

1, an electromagnetic wave shielding cable 100 for an automobile according to the present embodiment includes a core 10, an insulating layer 20, an electromagnetic wave shielding layer 30, and a coating layer 40.

The core 10 according to the present embodiment may be made of a conductive material. Here, the conductive material may be at least one selected from the group consisting of copper, tinned copper, nickel plated copper, silver plated copper, an alloy of copper and tin, a copper and magnesium alloy, aluminum, alloy, a copper-coated aluminum and magnesium alloys (copper Clad AL-MG alloy), a copper-coated iron can include (copper Clad steel). In addition, the core according to the present embodiment may be a single wire or a twisted wire in which multiple wires are twisted. The insulating layer 20 according to the present embodiment surrounds the periphery of the core 20. Here, the material of the insulating layer 20 is selected from the group consisting of polyvinyl chloride, crosslinked polyvinyl chloride, polyethylene, polyamide, polytetrafluoroethylene, It is preferable to use one or more of fluorinated ethylene propylene, ethylenetetrafluoroethylene, polypropylene, polyvinylidene fluoride, perfluoroalkoxy copolymer, thermoplastic polyurethane A thermoplastic polyether ester, a thermoplastic polyether ester, a thermoplastic polyether elastomer, a thermoplastic polyether elastomer, a thermoplastic polyether elastomer, a thermoplastic polyether elastomer, a thermoplastic polyether elastomer, Thermoplastic polystyrene block copolymer, A thermoplastic polyamide elastomer, a silicone rubber, and the like.

Since the electromagnetic wave shielding layer 30 surrounds the insulating layer 20 according to the present embodiment, the electromagnetic wave shielding layer 30 shields electromagnetic waves generated from the core 10. [

In detail, the electromagnetic wave shielding layer 30 according to the present embodiment surrounds the insulating layer 20 so as to partially overlap each other in the oblique direction along the surface of the insulating layer 20 in the form of a thin film having a predetermined width and length .

Here, the plurality of carbon fiber yarns 32a of the electromagnetic wave shielding layer 30 according to the present embodiment may be extended in the width direction of the electromagnetic wave shielding layer 30 and arranged in the longitudinal direction. Therefore, according to this embodiment has a plurality of yarn (32a), carbon fiber may be obliquely provided along the surface of the insulating layer 20 along the direction in which is installed the electromagnetic wave shielding layer (30).

As a result, since the plurality of carbon fiber yarns 32a are provided along the width direction and the longitudinal direction of the electromagnetic wave shielding layer 30 of the electromagnetic wave shielding layer 30 along the surface of the insulating layer 20, It is possible to provide an automotive electromagnetic wave shielding cable 100 having excellent flexibility in the direction and the longitudinal direction.

In addition, according to the present embodiment, since the electromagnetic wave shielding layer 30 includes a plurality of carbon fiber yarns 32a, it is possible to provide a lightweight electromagnetic wave shielding cable 100 for an automobile.

In addition, according to the present embodiment, the periphery of the insulating layer 20 can be easily surrounded by the tape-shaped electromagnetic wave shielding layer 30 having a predetermined width and length, so that it is easy to manufacture the electromagnetic wave shielding cable 100 for an automobile , Productivity can be improved.

Hereinafter, the electromagnetic wave shielding layer 30 according to the present embodiment will be described in detail.

FIG. 2 is a plan view schematically showing the electromagnetic wave shielding layer of the automobile electromagnetic wave shielding cable of FIG. 1, and FIG. 3 is a cross-sectional view of the electromagnetic wave shielding layer of FIG. 2 taken along line III-III.

2 and 3, the electromagnetic wave shielding layer 30 according to the present embodiment may include an insulating film 31 and an electromagnetic wave shielding thin film 32.

An electromagnetic wave shielding thin film 32 is thermally welded to one surface of the insulating film 31 and the other surface of the insulating film 31 opposite to the surface to which the electromagnetic wave shielding thin film 32 is bonded is coated with the coating layer 40, As shown in FIG.

Here, the material of the insulating film 31 may be selected from the group consisting of polyvinyl chloride, polyvinyl chloride, crosslinked, polyethylene, polyamide, polytetrafluoroethylene, It is preferred to use one or more of the following materials: fluorinated ethylene propylene, ethylenetetrafluoroethylene, polypropylene, polyvinylidene fluoride, perfluoroalkoxy copolymer, thermoplastic polyurethane, polyurethane, thermoplastic polyether polyurethane, thermoplastic polyether ester elastomer, thermoplastic polyether elastomer, thermoplastic polystyrene block copolymer ), Heat Firing polyamide days Restorative Murray (Thermoplastic polyamide elastomer), may include one of a silicon rubber (Silicone rubber).

It is impossible to uniformly place the carbon fiber yarn 32a on the upper surface of the insulating layer 20 when the shielding wire 100 is provided in the form of a shielding thin film in which the carbon fiber yarns 32a are disposed without binding force However, since the insulating film 31 is fused with the plurality of carbon fiber yarns 32a, the electromagnetic wave shielding layer 30 can be more easily wrapped on the upper surface of the insulating layer 20.

The electromagnetic wave shielding film 32 according to the present embodiment may include a plurality of carbon fiber yarns 32a and an electromagnetic wave shielding material 32b coated on each of the plurality of carbon fiber yarns 32a. That is, it is known that the carbon fiber yarn 32a has high shielding performance in a high frequency band (30 MHz to 1500 MHz). However, as shown in FIG. 4, in a low frequency band (510 kHz to 3 MHz) Performance.

Therefore, carbon fiber yarns are used, and other means are required to enhance the shielding performance in the low frequency band. Accordingly, the present invention provides an embodiment in which the surface of the carbon fiber yarn 32a is coated with the electromagnetic wave shielding material 32b.

Equation (1) below represents the shielding effect, and Equation (2) represents the absorption attenuation amount among them.

[Equation 1]

[Equation 2]

From equations (1) and (2) above, it can be confirmed that the shielding effect, more specifically, the attenuation amount of shielding can be increased by increasing the conductivity of shielding. That is, by coating the carbon fiber yarn 32a with the electromagnetic shielding material 32b having a high electrical conductivity, shielding performance can be improved even in a low frequency band.

The electromagnetic wave shielding material 32b may include at least one of palladium (Pd), nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), and magnesium (Mg). That is, one of these materials may be used, or two or more of them may be used in combination.

5 is a graph showing the shielding performance of the electromagnetic wave shielding cable of the embodiment of the present invention in which carbon fiber yarn coated with copper and nickel as the electromagnetic wave shielding material is applied.

As shown in FIG. 5, the shielding cable of the embodiment of the present invention shows a shielding performance of 20 dB or more in a low frequency region (510 kHz to 3 MHz), and shows a shielding performance higher than that of a shielded cable formed of only carbon fiber yarn.

Thus, in order to obtain a shielding performance of 20 dB or more, the minimum thickness t3 of the electromagnetic shielding material 32b should be 0.21 m or more. In this case, the electric conductivity corresponds to 6250 S / cm, and a shielding performance of 20 dB or more was obtained. At this time, the higher the plating thickness, the higher the conductivity and the higher the shielding performance. However, as the plating thickness increases, the specific gravity increases and the strength, elastic modulus and strain decrease. Therefore, the thickness t3 of the electromagnetic wave shielding material 32b is preferably 0.21 mu m to 0.3 mu m.

An electroless plating method can be used as a method of plating a carbon fiber yarn with an electromagnetic wave shielding material. However, in order to increase the conductivity, it is preferable to form the double layer by electroless plating after electroless plating rather than using the electroless plating method alone to increase the plating thickness with only one metal.

That is, when electroless plating is performed using only copper having high conductivity, although the conductivity is high, there is a possibility of corrosion on the exposed part when installed in a vehicle for a long period of use, and only electroless plating There is a problem that the electrical conductivity is low and the thickness of the plating is increased in order to obtain a desired shielding performance. Particularly, when electroless plating is performed only with nickel, a phosphorus component of sodium hypophosphite, which is used as a reducing agent, acts as a factor that interferes with the electric conductivity, and thus the thickness must be increased in order to satisfy the desired electric conductivity.

In order to solve this problem, a structure including an electroless plating layer 32b 'and an electroplating layer 32b' is developed as shown in FIG. 6, and in particular, an electroless plating layer is made of copper and an electrolytic plating layer Nickel was used to maximize the effect of the invention.

FIG. 6 is an enlarged cross-sectional view of the electromagnetic shielding material coated on the carbon fiber yarn and the carbon fiber yarn of FIG. 3;

6, the electromagnetic wave shielding material 32b coated on the carbon fiber yarn 32a includes an electroless plating layer 32b 'coated on the carbon fiber yarn 32a by electroless plating, And an electrolytic plating layer 32b "coated on the electroless plating layer 32b 'by an electrolytic plating method.

Here, the electroless plating layer 32b 'is made mainly of copper, and the electrolytic plating layer 32b' 'is made of nickel as a main component. Therefore, both of the advantages of high conductivity of copper and the advantages of nickel having high corrosion resistance .

Further, the electromagnetic wave shielding thin film 32 according to the present embodiment is located between the insulating layer 20 and the insulating film 31.

At this time, the plurality of carbon fiber yarns 32a coated with the electromagnetic wave shielding material 32a of the electromagnetic wave shielding thin film 32 may be arranged along the length direction of the electromagnetic wave shielding thin film 32 in the width direction.

Since the plurality of carbon fiber yarns 32a are spread in the width direction of the electromagnetic wave shielding thin film 32 according to the present embodiment, the thickness t of the electromagnetic wave shielding layer 30 surrounding the insulating layer 20 can be reduced . According to the present embodiment, since the electromagnetic wave shielding layer 30 is composed of a plurality of lightweight carbon fiber yarns 32a, it is possible to provide a lightweight electromagnetic wave shielding cable 100 for an automobile.

The thickness t of the electromagnetic wave shielding layer 30, which is the sum of the thickness t1 of the electromagnetic wave shielding thin film 32 and the thickness t2 of the insulating film 31 according to the present embodiment, is 0.1 mm or more to 0.5 mm or less .

Further, according to the present embodiment, since the plurality of carbon fiber yarns 32a can be arranged in the width direction of the electromagnetic wave shielding thin film 32 obliquely installed along the surface of the insulating layer 20 and arranged along the longitudinal direction, It is possible to provide an automotive electromagnetic wave shielding cable 100 having excellent flexibility in the direction and the longitudinal direction.

1, the electromagnetic wave shielding thin film 32 of the electromagnetic wave shielding layer 30 is obliquely installed along the surface of the insulating layer 20 so that the electromagnetic wave shielding thin film 32 spreads in the width direction of the electromagnetic wave shielding thin film 32, A plurality of carbon fiber yarns 32a arranged in the direction of the insulating layer 20 may be positioned obliquely along the surface of the insulating layer 20. [

Therefore, the electromagnetic wave shielding cable 100 for an automobile according to the present embodiment can be easily twisted along the width direction of the electromagnetic wave shielding foil 32 obliquely installed along the surface of the insulating layer 20.

According to this embodiment, since the plurality of carbon fiber yarns 32a having good flexibility are arranged in the longitudinal direction of the electromagnetic wave shielding thin film 32, it is possible to easily bend the electromagnetic wave shielding cable 100 for automobile along the longitudinal direction have.

According to the present embodiment, a plurality of carbon fiber yarns 32a are obliquely arranged along the surface of the insulating layer 20, and a plurality of carbon fiber yarns 32a having good flexibility are arranged in a length direction of the electromagnetic wave shielding thin film 32 The electromagnetic wave shielding cable 100 for an automobile can be easily twisted and bent at the same time in both the width direction and the longitudinal direction.

However, the electromagnetic wave shielding thin film 32 according to the present embodiment has not only a single-layer structure in which a plurality of carbon fiber yarns 32a are spread in the width direction of the insulating film 31a, but also a plurality Layer structure in which a plurality of other carbon fiber yarns are arranged on the carbon fiber yarn 32a.

Test Example

7 is a graph showing the results of the flexibility test of the electromagnetic wave shielding cable for an automobile shown in Fig.

Referring to FIG. 7, the flexibility of the electromagnetic wave shielding cable 100 for a vehicle according to the present embodiment is obtained by fixing an electromagnetic wave shielding cable for automobile of 400 mm to a flexible jig so as to have a radius of 80 mm, then lowering the load cell at a rate of 100 mm / (N) at a bending radius of 40 mm.

Specifically, the X axis represents the moving distance (mm) of the flexible jig due to the descent of the load cell, and the Y axis represents the load (N) applied to the load cell as the flexible jig descends.

The load (N) applied to the load cell is equal to the restoring force of the electromagnetic wave shielding cable for automobiles. The load (N) applied to the load cell, that is, the smaller the restoring force, the higher the flexibility of the electromagnetic wave shielding cable for an automobile, and the greater the restoring force, the lower the flexibility of an automobile electromagnetic wave cable.

According to the flexibility test results for Sample 1, Sample 2, Sample 3 and Sample 4, the average resilience of Samples 1 to 4 was measured to be 3.02N. Samples 1 to 4 are shielded cables of the first embodiment of the present invention manufactured based on the specifications shown in Table 1 below.

Nominal cross-sectional area (mm ² )
core
Insulation layer thickness (mm)
Electromagnetic wave shielding layer thickness (mm)
Coating layer thickness (mm)
Total outside diameter
(mm)


3.0 Small footprint / Small footprint (mm) Outside diameter (mm) 119 / 0.18 2.4 0.7 0.2 0.8 5.8

The restoring force of a shielded cable including a conventional braided shield layer made of a conventional tin-plated interconnected wire was measured to be 3.4N.

As a result, it was found that the flexibility of the electromagnetic shielding car cable made captive a plurality of carbon fibers according to the present embodiment according to the test example improved flexibility of a conventional shield cable.

In the case of the conventional wire made of a metal, the weight per unit length of the shielding material reaches 15 g / m ² (nominal cross-sectional area 3 mm ² ), whereas in the embodiment of the present invention, The weight can be drastically reduced to about 1/4 of the weight.

8 is a cross-sectional view of an electromagnetic wave shielding layer of an electromagnetic wave shielding cable for a vehicle according to a second embodiment of the present invention.

The electromagnetic wave shielding cable for an automobile according to the second embodiment of the present invention has the same configuration as the electromagnetic wave shielding cable 100 for a vehicle according to the first embodiment of the present invention except for the electromagnetic wave shielding layer 230.

Therefore, the detailed description of the same configuration as the electromagnetic wave shielding cable 100 for a vehicle according to the first embodiment of the present invention will be omitted.

The electromagnetic wave shielding layer 230 according to the present embodiment may include a first electromagnetic wave shielding part 231 and a second electromagnetic wave shielding part 232.

Specifically, the first electromagnetic shielding portion 231 according to this embodiment may include a first insulating film (231a) and the first electromagnetic wave shielding films (231b).

The material of the first insulating film 231a may be selected from the group consisting of polyvinyl chloride, polyvinyl chloride, crosslinked, polyethylene, polyamide, polytetrafluoroethylene, , Fluorinated ethylene propylene, ethylene tetrafluoroethylene, polypropylene, polyvinylidene fluoride, perfluoroalkoxy copolymer, thermoplastic polyurethane A thermoplastic polyether ester, a thermoplastic polyether ester, a thermoplastic polyether ester, a thermoplastic polyether ester, a thermoplastic polyether ester, a thermoplastic polyether ester, 블록 copolymer ), A thermoplastic polyamide elastomer, and a silicone rubber (Silicone rubber).

The first electromagnetic wave shielding film 231b may include electromagnetic wave shielding material 231b2 coated on a plurality of carbon fiber yarns 231b1 and a plurality of carbon fiber yarns 231b1. The electromagnetic wave shielding material 231b2 may include at least one of nickel (Ni), copper (Cu), silver (Ag), aluminum (Al), and magnesium (Mg).

At this time, the plurality of carbon fiber yarns 231b1 coated with the electromagnetic wave shielding material 231b2 of the first electromagnetic wave shielding thin film 231b may be extended in the width direction of the first electromagnetic wave shielding thin film 231b and may be arranged along the longitudinal direction have.

In addition, the second electromagnetic wave shielding part 232 according to the present embodiment may include the second insulating film 232a and the second electromagnetic wave shielding thin film 232b.

The second electromagnetic wave shielding film 232b may be positioned under the first insulating film 231a and the second electromagnetic wave shielding film 232b may be coupled to the second insulating film 232a.

Here, the second insulating film 232a may be formed of a material such as polyvinyl chloride, polyvinyl chloride, crosslinked, polyethylene, polyamide, polytetrafluoroethylene, It is preferred to use one or more of the following materials: fluorinated ethylene propylene, ethylenetetrafluoroethylene, polypropylene, polyvinylidene fluoride, perfluoroalkoxy copolymer, thermoplastic polyurethane, polyurethane, thermoplastic polyether polyurethane, thermoplastic polyether ester elastomer, thermoplastic polyether elastomer, thermoplastic polystyrene block copolymer ), Thermal St. polyamide days Restorative Murray (Thermoplastic polyamide elastomer), may include one of a silicon rubber (Silicone rubber).

The second electromagnetic wave shielding film 232b may include an electromagnetic wave shielding material 232b2 coated on each of the plurality of carbon fiber yarns 232b1 and the plurality of carbon fiber yarns 232b1. The electromagnetic wave shielding material (232b2) may include a nickel (Ni), copper (Cu), silver (Ag), aluminum (Al) and magnesium (Mg).

At this time, the plurality of carbon fiber yarns 232b1 coated with the electromagnetic wave shielding material 232b2 of the second electromagnetic wave shielding film 232b may be arranged along the length direction of the second electromagnetic wave shielding film 232b in the width direction of the second electromagnetic wave shielding film 232b .

The first electromagnetic wave shielding thin film 231b may be positioned between the first insulating film 231a and the insulating layer 20 and the second electromagnetic wave shielding thin film 232b may be positioned between the first insulating film 231a and the insulating layer 20, And the second insulation film 232a located below the coating layer 40. [

The plurality of carbon fiber yarns 231b1 of the first electromagnetic wave shielding foil 231b and the plurality of carbon fiber yarns 232b1 of the second electromagnetic wave shielding foil 232b are arranged in the same direction, And may be arranged in the longitudinal direction in the width direction of the thin film 231b and the second electromagnetic wave shielding thin film 232b.

At this time, the first electromagnetic wave shielding thin film 231b and the second electromagnetic wave shielding thin film 232b according to the present embodiment may be installed obliquely in the same direction along the surface of the insulating layer 20.

In detail, since the first and second electromagnetic wave shielding thin films 231b and 232b of the first and second electromagnetic wave shielding parts 231 and 232 are obliquely installed along the surface of the insulating layer 20, A plurality of carbon fiber yarns 231b1 and 232b2 extending in the width direction of the second electromagnetic wave shielding films 231b and 232b and arranged in the longitudinal direction may be positioned obliquely along the surface of the insulating layer 20. [

Therefore, according to the present embodiment, the automobile electromagnetic wave shielding cable can be easily twisted along the width direction of the first and second electromagnetic wave shielding films 231b and 232b.

According to the present embodiment, since the plurality of carbon fiber yarns 231b1 and 232b2 having good flexibility are arranged in the longitudinal direction of the first and second electromagnetic wave shielding films 231b and 232b, It is easy to bend along.

According to this embodiment, a plurality of carbon fiber yarns 231b1 and 232b2 are provided obliquely along the surface of the insulating layer 20, and a plurality of carbon fiber yarns 231b1 and 232b2 having good flexibility are disposed in the first and second 2 electromagnetic shielding films 231b and 232b, the electromagnetic wave shielding cable for an automobile can be easily twisted while being easily twisted in both the width direction and the length direction.

In addition, according to the present embodiment, since the electromagnetic wave shielding layer 230 is made of a plurality of lightweight carbon fiber yarns 231b1 and 232b2, the flexibility is maintained even when the thickness of the electromagnetic wave shielding layer 230 is increased, It is possible to provide an electromagnetic wave shielding cable.

According to the present embodiment, a plurality of carbon fiber yarns 231b1 and 232b2 coated with the electromagnetic wave shielding material 32b are sandwiched between the first electromagnetic wave shielding film 231b and the second electromagnetic wave shielding film 231b, And may be arranged in a double layer along the length direction in the width direction of the shielding film 232b.

Therefore, according to this embodiment, it is possible to provide an electromagnetic wave shielding cable for an automobile which is shielded from electromagnetic waves by double shielding and has excellent electromagnetic wave shielding performance.

Hereinafter, a method of manufacturing the electromagnetic wave shielding layer used in the first and second embodiments will be described.

9 is a conceptual diagram showing steps of the method for manufacturing an electromagnetic wave shielding layer according to the embodiment of the present invention.

9, in the method of manufacturing an electromagnetic wave shielding layer according to an embodiment of the present invention, an electromagnetic wave shielding material is coated on a carbon fiber yarn after unloading the carbon fiber sled 210 wound with the carbon fiber yarn, (S2) of uniformly spreading the electromagnetic wave shielding thin film (32) in a plane after unrolling the carbon fiber sled (220) coated with the electromagnetic wave shielding material, forming a spreading electromagnetic wave shielding thin film 32 to form an electromagnetic wave shielding layer in the form of a thin film tape (S3).

FIG. 10 is a block diagram sequentially showing steps of forming an electromagnetic wave shielding thin film by coating the carbon fiber yarn of FIG. 9 with an electromagnetic wave shielding material.

A method of coating a carbon fiber yarn used in an electromagnetic wave shielding cable for an automobile according to an embodiment of the present invention with an electromagnetic wave shielding material, that is, a method of manufacturing an electromagnetic wave shielding thin film, is characterized in that the carbon fiber yarn 32a is electrolessly plated in an electroless plating bath (S12) of washing after the electroless plating step (S11), and a step (S13) of electroplating after the water washing step (S12).

Since the degreasing, washing and activating steps performed before the general electroless plating step S11 are already well known, detailed description is omitted.

In the step of electroless plating (S11), 2.5 ~ 3.0 g / L of HCHO was used as a reducing agent, 25 ~ 35 g / L of EDTA was used as a complexing agent and 12 g / L of NaOH was used for pH control. At this time, the copper metal ion concentration should be 2.5-3.0 g / L, and the plating thickness can be 0.3 μm or less.

The step S12 of washing with water is the same as a known method used in a general plating process, and a detailed description thereof will be omitted.

After the washing step S12, the nickel metal ion concentration in the electrolytic plating step S13 is preferably 200 to 400 g / L.

Wherein the electroless plating step (S11), the water washing step (S12), and the electrolytic plating step (S13) comprise a continuous process, wherein the linear velocity of the carbon fiber yarn in the continuous process is from 0.65 to 1.05 m / min.

As described above, the plating thickness is set to 0.3 μm or less and the test results are shown in the following Table 2 as specifications for obtaining desired electric conductivity.

Plating flux
[m / min] Plating Thickness
[Mu m] Electrical conductivity
[S / cm] 0.65 0.25 8930 0.75 0.24 7820 0.95 0.23 6950 1.05 0.21 6250

As described above, when the plating process is carried out in the continuous process with the plating line specified in Table 2, a carbon fiber yarn having a thickness of 0.3 μm or less and an electric conductivity of 6250 to 8930 S / cm, which can exhibit desired shielding performance . ≪ / RTI >

11 is a conceptual diagram showing the process of the spreading step of FIG.

As shown in FIG. 9, the spreading step S2 unrolls the carbon fiber sled 220 coated with the electromagnetic wave shielding material, and spreads the carbon fiber yarn uniformly in a plane through the plurality of spreading devices. Specifically, the spreading apparatus includes a heater 320 that heats the carbon fiber yarn unloaded from the carbon fiber yarn 220, an inhaler 320 that suctions the fiber yarn heated through the heater 320 in a state in which tension is not applied 330). Therefore, when the carbon fiber yarn is passed through the plurality of spreading devices, the air is allowed to pass through the carbon fiber yarn so that a plurality of carbon fiber yarns are spread.

12 is a schematic view briefly showing a step (S3) of forming an electromagnetic wave shielding layer in the form of a thin film of FIG.

The spreading carbon fiber yarn roll 230 is unrolled to overlap the electromagnetic wave shielding thin film 32 with the insulating film 31 made of a synthetic resin material and then the plurality of heating devices 350 and the pressure roller The insulating film 31 and the shielding thin film 32 are fused via the insulating film 360. At the same time, the paper 361 is joined to the lower surface thereof and then rewound to form a roll to form an electromagnetic wave shielding layer.

The electromagnetic wave shielding cable can be manufactured by separating the paper 361 at the time of manufacturing a shielded cable and then fixing it so as to be surrounded by the surface of the insulating layer 20 in an oblique direction.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It goes without saying that it belongs to the scope of footsteps.

100: Automobile electromagnetic wave shielding cable
10: Core
20: Insulation layer
30, and 230: electromagnetic wave shielding layer
31: Insulation film
32: Electromagnetic wave shielding thin film
32a, 231b1 and 232b1: carbon fiber yarns
32b2, 231b2, 232b2: EMI shielding material
40:
231: First electromagnetic wave chafer
231a: first insulating film
231b: the first electromagnetic wave shielding thin film
232: second electromagnetic wave shielding part
232b: second electromagnetic wave shielding thin film
232a: second insulating film

Claims (14)

delete delete delete delete delete delete delete delete delete delete delete A method of manufacturing an electromagnetic wave shielding layer for use in an electromagnetic wave shielding cable for an automobile,
Forming an electromagnetic wave shielding thin film by coating an electromagnetic shielding material on the carbon fiber yarn after the continuous carbon fiber yarn unrolls the wound carbon fiber selenide;
Spreading the electromagnetic wave shielding film evenly in a plane; And
Forming an electromagnetic wave shielding layer in the form of a thin film tape by fusing an insulating film to the spread electromagnetic wave shielding thin film;
Lt; / RTI >
The step of forming the electromagnetic wave shielding thin film may include:
Electroless plating the carbon fiber yarn in an electroless plating bath;
Washing after the electroless plating step; And
Electroplating after the washing step;
Lt; / RTI >
Wherein the step of spreading comprises:
The plurality of carbon fiber yarns coated with the electromagnetic shielding material are unrolled and uniformly spread in a plane,
A heater for heating the un-rolled carbon fiber yarn, and an inhaler for sucking the carbon fiber yarn heated through the heater without tension being applied thereto. A method for manufacturing an electromagnetic wave shielding layer.
13. The method of claim 12,
The metal ion concentration in the electroless plating step is 2.5 to 3.0 g / L,
The metal ion concentration in the step of electrolytic plating is 200 to 400 g / L,
Wherein the electroless plating step, the water washing step, and the electrolytic plating step are continuous processes,
Wherein the linear velocity of the carbon fiber yarn in the continuous process is 0.65 to 1.05 m / min.
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