JP2002313146A - Shielding material for flat cable and flat cable with shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shielding material for a flat cable which it is easy to fit to a flat cable, excellent in magnetic wave shielding property, sliding characteristics, flame resistance or the like, as well as in economical efficiency, and a flat cable with shield of excellent performance and economical efficiency manufactured of same. SOLUTION: The shielding material for the flat cable 10 is structured with a metal thin film layer 2 such as aluminum deposition film on one side of an insulating board 1 having flexibility such as PET film, on which is fitted a conductive heat adhesion layer 3 with heat-adhesive resin containing a conductive filler, and a flame-resistant layer 4 with synthetic resin containing flame- resistant additive on the other side. Further, the flat cable with shield is made by winding the above shielding material 10 around the outer periphery of the flat cable with grounding wires exposed by cutting off a part of the coating material with the conductive heat adhesion layer 3 inside, and heating it with pressure and bonding it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable shielding material (electromagnetic wave shielding film) and a flat cable having a shielding function using the same.
By improving the layer structure of the shield material such as the shield layer and adhesive layer, it is possible to easily conduct the shield layer and the ground wire, and it is excellent in shielding properties, slidability, flame retardancy, economy, The present invention also relates to a flat cable shield material excellent in workability in attaching to a flat cable and a flat cable with a shield function using the same.

[0002]

2. Description of the Related Art In recent years, flat cables have been used in place of horizontal wound shield wires or coaxial wires for signal transmission in interfaces between devices such as communication devices, computers and peripheral devices and between devices. However, in an environment where various radio waves, electromagnetic waves, and the like are generated as in today, the flat cable is affected by these factors and often causes malfunction of the computer.

Accordingly, various shield technologies have been developed for protecting the flat cable from electromagnetic waves and for shielding electromagnetic waves generated from the flat cable from affecting other devices. For example, a metal foil is used in which an insulating adhesive layer is provided on the surface of a metal foil in order to adhere the metal foil to a flat cable by using a metal foil for a shield layer of the shield material. Also, a shield material in which an adhesive containing a conductive substance such as metal powder is applied to a plastic film and the conductive adhesive layer is used as a shield layer has been studied. In addition, a shield material formed as a shield layer by forming a conductive adhesive layer in which a conductive substance such as a metal powder is added to a metal foil has been studied.

Further, in order to improve the slidability of the shielding material, an electromagnetic wave shielding film in which a metal thin film is formed on a base film and then an adhesive resin layer containing silver particles and / or copper particles is formed has been proposed. (Japanese Unexamined Patent Application Publication No. 7-
94036). Since this shield tape has a metal thin film, it has excellent conductivity and electromagnetic wave shielding performance is improved.
When silver particles are contained in the adhesive resin layer, the cost increases, and when copper particles are contained, there is a problem in that the shielding characteristics deteriorate with time.

Further, there has been proposed an electromagnetic wave shielding film in which a silver vapor-deposited film is formed as a metal thin film on a base film and a nickel filler is contained in an adhesive resin layer (JP-A-11-120831). This shield tape is also expensive because the base film is a flame-retardant engineering plastic and the metal thin film is silver deposited. Further, in order to make the base film flame-retardant, a film using a flame-retardant engineering plastic film such as polyphenylene sulfide, polyamide imide, polyether imide, or polyarylate is known as the base film.

[0006]

However, a metal foil is used for the shielding layer of the shielding material, and an insulating adhesive layer is provided on the surface of the metal foil in order to adhere the metal foil to a flat cable. In order to conduct the shield layer and the ground wire of the flat cable, a part of the insulating adhesive layer is cut off to expose the metal foil, and a part of the covering material of the flat cable is cut And the exposed ground line and metal foil (shield layer)
It was necessary to make the connection between the two by a special processing method such as spot welding. Further, when a metal foil is used for the shield layer, the flexibility of the metal foil is inferior, so that there is a problem in that the mounting of the flat cable is restricted and the shape of the electronic member is restricted.

[0007] In order to solve the above-mentioned problems, a shielding material provided with a conductive adhesive layer on a plastic film has a high flexibility, so that a restriction is imposed on mounting of a flat cable and a shape of an electronic member is restricted. However, there is a problem that the shielding characteristics are inferior to the shielding material using a metal foil. Furthermore, in order to make the shielding material flame-retardant, when using a flame-retardant engineering plastic film such as polyphenylene sulfide, polyamide imide, polyether imide, or polyarylate as the base film, the cost of these films is high. However, the cost of the shielding material is increased, and there is a problem in terms of economy.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a workability in attaching to a flat cable to provide an electromagnetic wave shielding property. We provide flat cable shielding materials that have the necessary sliding properties, electromagnetic wave shielding properties, conductive heat bonding properties, flame retardancy, and are also economical.
An object of the present invention is to provide a flat cable with a shield function which is excellent in economical efficiency as well as required performances manufactured using the shield material.

[0009]

The above objects can be attained by the present invention described below. That is, according to the invention described in claim 1, a metal thin film layer is provided on one surface of an insulating base material having flexibility, and a conductive filler is added to a heat-adhesive resin on the metal thin film layer. A flat cable, characterized in that a conductive heat-adhesive layer containing the flame-retardant layer is provided, and on the other surface, a flame-retardant layer comprising a synthetic resin containing a flame-retardant agent is provided. Made of shielding material.

By adopting such a configuration, the following functions and effects can be obtained. (1) Since the metal thin film layer is used as the electromagnetic wave shielding layer instead of the metal foil, the shielding material can have good shielding properties and excellent flexibility. Therefore, the flat cable to which this is attached can be made excellent in shielding properties and sliding characteristics without any restrictions on its installation and no restriction on the shape of the electronic member. (2) Since the conductive heat bonding layer formed by adding a conductive filler to the heat bonding resin is provided on the metal thin film layer as the electromagnetic wave shielding layer, attachment to the flat cable is easy by thermocompression bonding. At this time, conduction with the metal thin film layer (electromagnetic wave shielding layer) can be easily performed only by exposing a part of the ground line of the flat cable. (3) A flame-retardant layer formed by adding a flame-retardant-imparting agent to a synthetic resin is provided on the surface of the flexible insulating substrate opposite to the surface on which the metal thin film layer (electromagnetic wave shielding layer) is provided. Since it is provided, there is no need to use a high-cost flame-retardant engineering plastic film as in the past as an insulating base material. For example, even if a general-purpose plastic film such as a biaxially stretched polyester film is used, it can be used as a shielding material. Since flame retardancy can be imparted, cost can be reduced. Also,
Since the flame retardant layer is provided as an independent layer separately from the conductive heat bonding layer, the content of the flame retardant can be increased, and higher flame retardancy can be imparted. .

In the invention described in claim 2, the flexible insulating substrate is a biaxially stretched polyethylene terephthalate film, and the metal thin film layer has a thickness of 0.04 to 0.04.
2. The flat cable shielding material according to claim 1, wherein the aluminum material is a 0.2 μm aluminum vapor-deposited film.

By adopting such a structure, in addition to the function and effect of the invention described in claim 1, the biaxially stretched polyethylene terephthalate film (hereinafter referred to as PET film) has flexibility and insulating properties. Besides, heat resistance,
The overall performance is excellent and the cost is low, such as mechanical strength, water resistance, and chemical resistance. Therefore, the cost can be reduced while maintaining the required performance of the shielding material. In addition, since the metal thin film layer of the shield layer is an aluminum vapor-deposited film having a thickness of 0.04 to 0.2 μm, the shield has a flexible and sufficient shielding effect, and is excellent in productivity and economy. It can be a layer. The thickness of the aluminum deposited film is preferably in the range of 0.04 to 0.2 μm,
The range of 0.09 to 0.12 μm is more preferable. When the thickness is less than 0.04 μm, the shielding effect becomes insufficient, and when the thickness exceeds 0.2 μm, the material already has sufficient shielding properties, and the productivity is lowered and the manufacturing cost is reduced. It is not preferable because it rises.

According to a third aspect of the present invention, the conductive filler contained in the conductive heat bonding layer is carbon particles, and the content of the carbon particles is 10 to 30% by weight. The shield material for a flat cable according to claim 1 or 2.

By adopting such a configuration, in addition to the functions and effects of the invention described in claim 1 or 2, the carbon particles have conductivity and are more effective than metal particles such as silver particles and copper particles. Also, since the cost is low, the conductive heat bonding layer can be formed at low cost. Further, by setting the content of the carbon particles to 10 to 30% by weight,
The necessary conductivity can be reliably provided to the conductive heat bonding layer. When the content of the carbon particles is less than 10% by weight, the conductivity is insufficient, which is not preferable. When the content is more than 30% by weight, the conductivity is sufficient, but the processability of film formation and the thermal adhesion Is undesirably reduced.

The invention described in claim 4 is characterized in that the flame-retardant layer is formed of a synthetic resin layer containing a flame-retardant agent in an amount of 20 to 80% by weight. The shield material for a flat cable according to any one of the above.

By adopting such a configuration, in addition to the function and effect of the invention described in any one of the above-mentioned claims, the flame retardant layer more reliably increases the flame retardancy required for the shield material. Can be granted. Further, since the flame retardant layer is provided separately from the conductive thermal bonding layer, even if the content of the flame retardant is increased, the conductivity and the thermal adhesiveness of the conductive thermal bonding layer are impaired. And a higher degree of flame retardancy can be easily imparted. Therefore, by using this flat cable shield material, it becomes easy to pass the shielded flat cable to the UL standard flame retardancy test. The content of the flame retardant is 20% by weight.
If the amount is less than 80% by weight, it is not preferable because sufficient flame retardancy cannot be imparted. If the amount exceeds 80% by weight, sufficient flame retardancy has already been imparted and there is no necessity. It is not preferable because the processability decreases and the film strength also decreases.

According to a fifth aspect of the present invention, the flat cable shielding material according to any one of the first to fourth aspects is integrated by heating and pressing to the outer periphery of the flat cable to impart a shielding function to the flat cable. It is a flat cable with a shield characterized by the above-mentioned.

By adopting such a structure, the performance and the effect of the flat cable shielding material according to any one of the first to fourth aspects are added to the flat cable. A shielded flat cable having excellent performance and productivity such as dynamic characteristics and flame retardancy can be provided at low cost.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing the configuration of an embodiment of the flat cable shielding material of the present invention. FIG. 2 is a diagram illustrating the configuration of an embodiment of a shielded flat cable manufactured using the flat cable shielding material of the present invention,
(A) is a partially cutaway plan view, (B) is A in (A).
It is an expanded sectional view in the -A line.

The shield material for a flat cable of the present invention can be configured as shown in FIG. That is, the shield material 10 for a flat cable shown in FIG.
On one surface of a flexible insulating base material 1 such as a T film, a metal thin film layer 2 such as an aluminum vapor-deposited film is provided as a shield layer. Particles, a conductive heat bonding layer 3 containing a conductive filler such as carbon particles is provided, and on the other surface,
It is provided with a flame retardant layer 4 in which a synthetic resin contains a flame retardant. Although not shown in the drawing, a primer layer or the like may be provided in advance on the surface of the insulating substrate 1 on which the metal thin film layer 2 or the flame retardant layer 4 is formed to improve the adhesiveness. it can.

When a flat cable with a shield is manufactured using the flat cable shield material 10, it can be configured, for example, as shown in FIGS. That is, in the shielded flat cable 100 shown in FIG. 2, the conductor 5 made of tinned soft copper foil and the ground wire 6 are arranged in parallel at a predetermined interval, and the conductor 5 is covered with the flat cable covering material 7 from both sides. 5 and the ground wire 6 are integrated by heating and pressing so as to be embedded, to produce a flat cable, and the coating 7 on one side of the ground wire 6 of the flat cable is partially cut off in the length direction. After exposing the ground wire 6, the outer periphery thereof is covered with the flat cable shielding material 10 described above.
Then, the conductive thermal bonding layer 3 is directed inward, the both ends are arranged so as to be overlapped, and both sides are heated and pressed by a heating rubber roll to be thermally bonded and integrated.

By adopting such a configuration, the exposed portion of the ground wire 6 and the metal thin film layer (shield layer) 2 of the flat cable shield material 10 form the conductive heat bonding layer 3 only by heating and pressing. The shielded flat cable 100 having excellent performance such as slidability and flame retardancy is provided, while being easily conducted at the ground line-shield layer conducting portion 8 to impart excellent shielding properties to the flat cable. Can be provided well.

The shield material 1 for a flat cable of the present invention
0 (see FIG. 1), a flexible insulating substrate 1
Has excellent properties such as flexibility, electrical insulation, heat resistance, various mechanical strength, chemical resistance, solvent resistance, etc.
It is preferably low cost, for example, polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polytetramethylene terephthalate, polyolefins such as polypropylene, ethylene-propylene copolymer, nylon 1
2, non-stretched or stretched films such as polyamides such as nylon 6, nylon 66, wholly aromatic polyamide, and fluorine-containing resins such as polytetrafluoroethylene, polytrifluoroethylene, polyvinylidene fluoride, and polyvinyl fluoride can be used. it can. Among them, a PET film is excellent in ease of film formation and economical efficiency as well as the above-mentioned performance, and thus can be particularly preferably used. The thickness of the flexible insulating substrate 1 is suitably in the range of 6 to 20 μm. The surface of the insulating substrate 1 on which the metal thin film layer 2 and the flame retardant layer 4 are formed is subjected to corona discharge treatment, plasma treatment,
It is preferable to perform an adhesion strengthening treatment such as an ozone treatment.

Next, the metal thin film layer (shield layer) 2 provided on one surface of the flexible insulating base material 1 is preferably one having high conductivity when a thin film is formed.
A vapor-deposited film of aluminum, silver, copper, nickel, or the like is suitable, and among them, an aluminum-deposited film is particularly preferable because it is excellent in processability and conductivity of vapor deposition, and is low in cost and excellent in economic efficiency.

The shielding property of the metal thin film layer 2 increases as the thickness thereof increases. However, when the metal thin film layer 2 is too thick, the flexibility is reduced and the bending suitability and slidability deteriorate. Therefore, the thickness of the metal thin film layer 2 is suitably from 0.04 to 0.2 μm, and from 0.08 to 0.2 μm.
0.15 μm is more preferred. As a method for forming the metal thin film layer 2, vacuum deposition, sputtering, CVD, or the like can be used, but a vacuum deposition method excellent in mass productivity is advantageous.

The conductive thermo-adhesive layer 3 is formed by dispersing a conductive filler in a thermo-adhesive resin to impart conductivity, and the conductive thermo-adhesive resin is coated on the metal thin film layer 2 by means such as coating. They are formed by lamination. The conductive heat bonding layer 3 needs to be thermally bonded to the metal thin film layer 2 and the outer layer of the flat cable and the exposed ground line of the flat cable. Accordingly, examples of the heat-adhesive resin include polyester resins, polyolefin resins (including ionomers and other acid-modified polyolefin resins), polystyrene resins, polyamide resins, acrylic resins, polyvinyl ether resins, and silicone resins. It can be used by appropriately selecting from a series of resins, rubber resins and the like.

In particular, a polyester film is often used for the outer layer of the flat cable, and in that case, a polyester resin can be suitably used as the thermal adhesive resin. This polyester resin is a saturated copolymerized polyester resin, among which the glass transition point is −50 to 80 ° C., and the weight average molecular weight is 7000.
It is preferable to use a resin composition mainly composed of a resin in the range of 1 to 50,000.

As the conductive filler to be contained in the heat-adhesive resin, carbon particles, metal powders such as nickel, copper, silver, alloy powders such as solder, metal whiskers, metal-plated glass fibers and the like are used. be able to. However, in the present invention, it is preferable that the cost is low, and from this point, it is preferable to use carbon particles. When carbon particles are used, the length (or diameter) of the particles is 0.1.
It is used in the range of 01 to 20 μm, and among them, 0.01 to 5 μm, which is easily dispersed, is desirable. Examples of the carbon particles include spheres, granules, flakes, needles, and fibrous shapes, and in terms of conductivity, flakes, needles, and fibrous shapes are preferred. Can be preferably used because it is easy to disperse, provides good conductivity by adjusting the content, and is low in cost.
The content of such a conductive filler is preferably 10 to 30% by weight based on the solid content of the conductive heat bonding layer 3.

Next, the flame retardant layer 4 is formed of a resin layer in which a flame retardant is dispersed in a synthetic resin of a binder, and the flame retardant is dispersed in a synthetic resin solution of the binder. Is preferably formed by a method of applying and drying this to a flexible insulating substrate 1, for example, a PET film. The synthetic resin of the binder may be either a thermoplastic resin or a thermosetting resin as long as it has appropriate flexibility and heat resistance and adheres well to the insulating substrate 1. In addition to the system resins and polyester resins, polystyrene resins, polyvinyl acetate resins, polyolefin resins, polyamide resins, silicone resins, polyacrylic or polymethacrylic resins can be used.

Examples of the flame retardant include chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenyl,
Chlorinated compounds such as perchlorpentacyclodecane, heptic anhydride, chlorendic acid, and tetrabromoethane, tetrabromobisphenol A, hexabromobenzene, decabromobiphenyl ether, tetrabromophthalic anhydride, polydibromophenylene oxide, hexabromo Organic or inorganic compounds containing halogen elements, such as bromine compounds such as cyclodecane and ammonium bromide, and triallyl phosphate, alkyl allyl phosphate, alkyl phosphate, dimethylphosphonate, phosphorinate, and halogenated phosphorate esters , Trimethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricresyl phosphate Feto, cresyl phenyl phosphate, triphenyl phosphate, tris (chloroethyl) phosphate, tris (2-chloropropyl)
Phosphate, tris (2,3-dichloropropyl) phosphate, tris (2,3-dibromopropyl) phosphate, bis (2,3-dibromopropyl) 2,3-
Dichloropropyl phosphate, bis (chloropropyl) monooctyl phosphate, polyphosphonate,
Polyphosphates, aromatic polyphosphates, phosphate or phosphorus compounds such as dibromoneopentyl glycol, phosphonate-type polyols, phosphate-type polyols, polyol compounds such as halogen-containing polyols, aluminum hydroxide, magnesium hydroxide,
Antimony trioxide, antimony trichloride, antimony pentoxide, zinc borate, antimony borate, boric acid, antimony molybdate, molybdenum oxide, phosphorus and nitrogen compounds,
Metal powders and inorganic compounds such as calcium aluminum silicate, zirconium compound, tin compound, dawsonite, calcium aluminate hydrate, copper oxide, copper metal powder, calcium carbonate, barium metaborate, etc., silicone polymer, ferrocene, fumaral Acids, maleic acid, triazine compounds, melamine cyanurate, isocyanurate, urea, guanidine compounds and the like can be used.

In the present invention, one or more of the above-mentioned synthetic resins are added with one or more of the above-mentioned flame retardants, and if necessary, other additives are added. Add an additive, for example, mix, dissolve or disperse with a solvent such as toluene, ethyl acetate, alcohols, methyl ethyl ketone, diluent or the like to prepare a coating solution, which is knife-coated, roll-coated, bar-coated, micro-coated. The flame-retardant layer 4 can be formed by applying and drying with a coating means such as a bar coat or a gravure coat.

The coating solution for the flame-retardant layer 4 is not limited to an organic solvent, but may be an aqueous or water-alcohol emulsion or dispersion depending on the synthetic resin selected. The content of the flame retardant in the flame retardant layer 4 is preferably from 20 to 80% by weight, more preferably from 30 to 60% by weight, based on the solid content of the flame retardant layer. The thickness of such a flame retardant layer 4 is suitably from 20 to 60 μm.

By providing such a flame-retardant layer 4 on the surface of the insulating substrate 1 having flexibility, the insulating substrate 1 can be made of PE.
Even if a T film is used, the oxygen index (JIS K7201)
In -2), flame retardancy of 21 or more can be easily provided. The oxygen index is more preferably 25 to 35, but in the flat cable shielding material of the present invention, the flame retardant layer 4
Is formed as a single layer separately from the conductive heat bonding layer 3, so that even if the content of the flame retardant is increased, the performance of the conductive heat bonding layer 3 is not impaired. Oxygen index 2
5 to 35 flame retardancy can be more easily imparted.

[0034]

The present invention will be described more specifically below with reference to examples. Example 1 As shown in FIG. 1, a 12 μm thick PET film was used as a flexible insulating substrate 1.
On one surface, as a metal thin film layer (shield layer) 2,
An aluminum vapor-deposited film having a thickness of 0.1 μm is formed, and a coating liquid for a conductive thermal adhesive layer having the following composition is further dried on the aluminum vapor-deposited film to a thickness of 33 μm by a microbar coating method. After coating and drying to form the conductive thermal adhesive layer 3, a coating solution for a flame retardant layer having the following composition is dried on the other surface of the PET film by a microbar coating method to obtain a thickness when dried. Was applied and dried to form a flame-retardant layer 4, whereby a flat cable shield material 10 of Example 1 was produced.

(Composition of Conductive Thermal Adhesive Layer Coating Solution) Thermal adhesive resin (thermoplastic saturated polyester resin) 60 parts by weight Conductive filler (particulate carbon, particle size 0.1 to 1.0 μm) 25 parts by weight Solvent (MEK) : Toluene 1: 1) 130 parts by weight (Note) MEK is methyl ethyl ketone

(Composition of Flame Retardant Layer Coating Solution) Binder (polyurethane resin) 40 parts by weight Flame retardant 10 parts by weight Bromine flame retardant 10 parts by weight Antimony trioxide 5 parts by weight Aluminum hydroxide 10 parts by weight Solvent (toluene) : Ethyl acetate: IPA weight ratio 1: 1: 1) 100 parts by weight (Note) IPA is isopropyl alcohol

The surface resistance of the conductive thermal bonding layer 3 of the flat cable shielding material 10 produced as described above is 4 Ω.
/ □. The flame retardancy was 30.
Next, using the flat cable shield material 10, a shielded flat cable 100 having the configuration shown in FIGS. 2A and 2B was produced as follows. That is, as a flat cable, a conductor 5 and a ground line 6 made of tin-plated soft copper foil are arranged in parallel at a predetermined interval, covered with a covering material 7 for a flat cable from both sides, and heated and pressed to apply the conductor 5 and the ground. Embed line 6,
Using a flat cable integrally manufactured, the covering material 7 on one side of the ground line 6 of the flat cable is partially cut off in the length direction to expose the ground line 6, and then the outer periphery of the flat cable is exposed. With the flat cable shielding material 10, the conductive thermal bonding layer 3 is directed inward, and both ends are arranged in an overlapping manner. The cable 100 was manufactured.

In the flat cable with shield 100 thus manufactured, the exposed portion of the ground wire 6 and the metal thin film layer (shield layer) 2 of the flat cable shield material 10 are electrically conductively bonded by heating and pressing. Through the layer 3, it is easily conducted at the ground line-shield layer conducting portion 8, and excellent flatness is imparted to the flat cable, slidability is excellent, and the flame retardancy is UL.
It passed the standard flame retardancy test.

[0039]

As described in detail above, according to the present invention, there is provided a flat cable shielding material for imparting electromagnetic wave shielding to a flat cable, which has a high level of flame retardancy and electromagnetic wave shielding. In addition to having sliding resistance (bending resistance), it has excellent heat adhesion to the covering material of the flat cable and conductive heat adhesion to the ground wire (metal), and is easy to attach to the flat cable. Further, there is an effect that a shield material for a flat cable which is excellent in economy can be provided with high productivity. Also, by using the flat cable shielding material of the present invention,
By manufacturing shielded flat cables,
The present invention has the effect of providing a shielded flat cable having high flame retardancy and electromagnetic wave shielding properties, and excellent in performance such as sliding resistance (bending resistance) with good productivity and economical efficiency.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a configuration of an embodiment of a flat cable shielding material of the present invention.

FIG. 2 is a view for explaining the configuration of an embodiment of a shielded flat cable manufactured using the flat cable shielding material of the present invention, wherein (a) is a partially cutaway plan view, and (b). FIG. 2 is an enlarged cross-sectional view taken along line AA in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 flexible insulating base material 2 metal thin film layer (shield layer) 3 conductive heat bonding layer 4 flame retardant layer 5 conductor 6 ground wire 7 flat cable covering material 8 ground wire-shield layer conductive part 10 flat cable Material for shield 100 Flat cable with shield

Claims (5)

[Claims] 1. One surface of a flexible insulating base material,
A metal thin film layer is provided, and on the metal thin film layer, a conductive heat bonding layer formed by adding a conductive filler to a heat bonding resin is provided, and on the other surface, a flame retardant synthetic resin is provided. A shield material for a flat cable, comprising a flame-retardant layer containing an imparting agent. 2. The flexible insulating base material is a biaxially stretched polyethylene terephthalate film, and the metal thin film layer is an aluminum vapor-deposited film having a thickness of 0.04 to 0.2 μm. The shield material for a flat cable according to claim 1. 3. The conductive filler contained in the conductive heat bonding layer is carbon particles, and the content of the carbon particles is 10 to 30% by weight. The shielding material for flat cables described in the above. 4. The method according to claim 1, wherein the flame retardant layer contains a flame retardant.
The flat cable shielding material according to any one of claims 1 to 3, wherein the shielding material is formed of a synthetic resin layer containing 0% by weight. 5. A flat cable having a shielding function, wherein the flat cable shielding material according to any one of claims 1 to 4 is integrated by heating and pressurizing the flat cable with an outer periphery thereof. Flat cable.