JP2002329424A - 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 is easy to be mounted on the flat cable and superior in performances such as an electromagnetic wave shieldability, slidability, flame retardancy or the like and economic property, and provide the flat cable with a shield to use the material, superior in performances and economic property. SOLUTION: The shielding material 10 for the flat cable is constituted so that a metallic thin film layer 2 such as an aluminum vapor-deposited layer or the like is installed at one face of an insulating substrate 1 such as a PET film or the like, and a flame-resistant heat-adhesive layer 3 prepared from the heat adhesive resin containing flame resistance additive and an electroconductive heat-adhesive layer 4 prepared from the heat-adhesive resin containing electroconductive filler are installed in an alternately adjacent pattern state on it and so that a volume ratio of the both will be 50 to 95 vol.% for the flame retardant heat-adhesive layer 3 and 50 to 5 vol.% for the electroconductive heat-adhesive layer 4. The flat cable with the shield is prepared by coiling the shielding material 10 on an outer periphery of the flat cable directing the electroconductive heat-adhesive layer 4 toward the inside, and by heating and pressurizing the material to make it adhered.

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. Further, 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 (JP-A-6-283).
053).

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). This shield tape has excellent conductivity because it has a metal thin film, has good electromagnetic wave shielding properties, and has good sliding properties.However, when a flame-retardant engineering plastic film is used for the base film, the cost is high, and the polyester film is expensive. In the case of using, there is a problem that the flame retardancy is poor.

[0005] Further, there has been proposed an electromagnetic wave shielding film in which a flame-retardant engineering plastic film is used as a base film, a silver thin film is formed as a metal thin film on the base film, and a nickel filler is contained in an adhesive resin layer (Japanese Patent Application Laid-Open No. H11-157556). Kaihei 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.

[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 connect 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 off to ground. It was necessary to expose the wire and to conduct the exposed ground wire and the metal foil (shield layer) by a special processing method such as spot welding. In addition, when a metal foil is used for the shield layer, the shielding properties are excellent, but the metal foil is inferior in flexibility, so that there is a restriction in mounting the flat cable,
There is a problem that 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. When a polyester film is used as the base film, there is a problem that the flame retardancy is poor.

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 characteristics, electromagnetic wave shielding properties, flame retardancy, thermal adhesion, and are economical, and also provide the necessary materials manufactured using the shielding materials. An object of the present invention is to provide a flat cable with a shield function that is excellent in performance and economical efficiency with high productivity.

[0009]

The above objects can be attained by the present invention described below. That is, according to the first aspect of the present invention, a metal thin film layer is provided as a shield layer on one surface of a flexible insulating base material, and a heat-adhesive resin is hardly formed on the metal thin film layer. A flame-retardant heat-adhesive layer containing a fire-imparting agent, and a conductive heat-adhesive layer containing a conductive filler in a heat-adhesive resin are alternately provided in a pattern adjacent to each other, and The flame-retardant heat-bonding layer and the conductive heat-bonding layer are 50 to 95% by volume of the total volume of both, and the remaining 50 to 5% by volume is the conductive-bonding layer. It is made of a shield material for a flat cable, which is formed so as to be a heat bonding layer.

In the above, a pattern in which the flame-retardant thermal bonding layer and the conductive thermal bonding layer are alternately adjacent to each other is
For example, stripes, lattices, or multiple circles,
Any pattern can be arbitrarily provided as long as both are arranged in a well-balanced manner, such as a pattern in which rectangles and the like are arranged at predetermined intervals. Further, it is preferable that the patterns which are alternately adjacent to each other have no gaps in that the entire upper surface of the metal thin film layer can be effectively used, but there may be some gaps and overlaps.

By adopting such a configuration, the following functions and effects can be obtained. (1) Since a metal thin film layer is provided as a shielding layer (electromagnetic wave shielding layer) instead of a 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 flame-retardant heat-bonding layer and the conductive heat-bonding layer are alternately provided on the metal thin film layer as the shield layer in a pattern adjacent to each other, both are arranged in a well-balanced manner on the entire surface. At the same time, the flame-retardant heat-bonding layer does not require conductivity, and can contain more flame-retardant-imparting agents within a range that does not impair the heat-bonding property. In the heat bonding layer, does not require flame retardancy,
More conductive filler can be contained within a range that does not impair the thermal adhesion. Therefore, the functionality of each layer can be further improved, and the flame retardancy, the conductivity for conducting the metal thin film layer and the ground wire of the flat cable, and the thermal adhesion to the coating material of the flat cable and the ground wire can be improved. It can be an excellent shielding material.

(3) As described above, the flame-retardant heat-bonding layer and the conductive heat-bonding layer are arranged on the entire surface in a well-balanced manner. The volume ratio of the flame-retardant heat-adhesive layer is 50 to 9
Since 5% by volume and the remaining 50 to 5% by volume are formed as conductive heat bonding layers, a sufficient amount of a flame retardant may be contained in the flame retardant heat bonding layer. Even if a general-purpose plastic film such as a biaxially stretched polyethylene terephthalate film is used for a flexible insulating base material instead of a conventional high-cost flame-retardant engineering plastic film for a conventional insulating film, the shielding material is sufficient. High flame retardancy and cost can be reduced. (4) Further, the flame-retardant heat-bonding layer and the conductive heat-bonding layer both have a heat-bonding property, and the conductive heat-bonding layer is also arranged on the entire surface of the metal thin-film layer in a well-balanced manner. The shield material can be easily attached to the flat cable by thermocompression bonding. At this time, only a part of the ground wire of the flat cable is exposed, and the ground wire and the metal thin film layer (shield layer) Can be easily conducted by the conductive heat bonding layer. When the volume ratio of the flame-retardant thermal adhesive layer is less than 50% by volume, the flame retardancy of the shield material becomes insufficient, and when it exceeds 95% by volume, the flame retardancy is sufficient. However, it is not preferable because the conductive heat bonding layer becomes too small and it becomes difficult to conduct the ground line and the metal thin film layer (shield layer).

According to a second aspect of the present invention, 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, which is a 0.2 μm aluminum vapor-deposited layer.

By adopting such a configuration, in addition to the functions and effects of the invention described in the first aspect, the biaxially stretched polyethylene terephthalate film (hereinafter referred to as a 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. Further, by forming the metal thin film layer of the shield layer as an aluminum vapor-deposited layer 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 vapor-deposited layer 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 layer has sufficient shielding properties. It is not preferable because the productivity is lowered due to the necessity of processing and the production cost is increased.

According to a third aspect of the present invention, the flat cable shielding material according to the first or second aspect is integrated by heating and pressurizing the outer periphery of the flat cable to impart a shielding function to the flat cable. This is a shielded flat cable.

By adopting such a configuration, the performance and operation and effect of the flat cable shielding material according to the first or second aspect of the present invention are added to the flat cable. A shielded flat cable excellent in performance and productivity such as characteristics and flame retardancy can be economically provided.

[0017]

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 layer is provided as a shield layer. A flame-retardant heat-bonding layer 3 containing a fire-imparting agent,
Conductive thermal bonding layers 4 each containing a conductive filler in a thermal adhesive resin are provided in a pattern so as to be alternately adjacent to each other, and the flame-retardant thermal bonding layer 3 and the conductive thermal bonding layer 4, when the flame-retardant heat bonding layer 3 is 50 to 50% of the total volume of both.
95% by volume, and the remaining 50 to 5% by volume is formed to be the conductive heat bonding layer 4. Although not shown in the drawings, a primer layer or the like can be provided in advance on the surface of the flexible insulating base material 1 on which the metal thin film layer 2 is formed to improve the adhesiveness. .

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 and the ground wire 6 made of tin-plated soft copper foil or the like are arranged in parallel at a predetermined interval, and are covered with the flat cable covering 7 from both sides. Heating and pressurizing to embed the conductor 5 and the ground wire 6 to integrate them, and produce a flat cable,
A part or all of the covering material 7 on one side of the ground line 6 of the flat cable is cut off in the length direction to expose the ground line 6, and the outer periphery thereof is protected by the flat cable shielding material 10 with the difficulties. The heat-bonding layer 3 and the conductive heat-bonding layer 4 are formed so that the surfaces on which the heat-bonding layer 3 and the conductive heat-bonding layer 4 are formed face inward, and the both ends are overlapped. It was done.

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 4 only by heating and pressing. In this way, the flat wire is easily conducted by the ground line-shield layer conducting portion 8, and the excellent shielding properties of the metal thin film layer 2 are imparted to the flat cable, and the performance such as slidability and flame retardancy and the economy are excellent. The shielded flat cable 100 can be provided with high productivity. In FIG. 2, as an embodiment of the shielded flat cable, a configuration in which the flat cable shielding material 10 is attached to the entire outer periphery of the flat cable in order to further complete the shielding effect is shown. In some cases, for example, a configuration may be adopted in which a flat cable shielding material is attached only to the surface of the flat cable on which the ground line is exposed.

Shield material 1 for 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 polyamides, and fluorine-containing resins such as polytrifluoroethylene, polyvinylidene fluoride, and polyvinyl fluoride can be used. Among them, a PET film is excellent in ease of film formation and economical efficiency as well as the above-mentioned performance, and can be particularly preferably used. The thickness of the flexible insulating substrate 1 is suitably in the range of 6 to 20 μm from the viewpoint of strength and flexibility. Further, it is preferable that the surface of the insulating base material 1 on which the metal thin film layer 2 is formed is subjected to an adhesion enhancing treatment such as a corona discharge treatment, a plasma treatment and 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 layer of aluminum, silver, copper, nickel or the like is suitable, and among them, an aluminum-deposited layer is particularly preferable because it is excellent in processability and conductivity of vapor deposition, and is low in cost and excellent in economic efficiency.

As the metal thin film layer 2 becomes thicker, the shielding characteristics become higher. However, if the metal thin film layer 2 becomes too thick, the flexibility is lowered and the bending aptitude and slidability are deteriorated. Accordingly, as described above, the thickness of the metal thin film layer 2 is suitably from 0.04 to 0.2 μm, and more preferably from 0.09 to 0.12 μm. The method for forming the metal thin film layer 2 includes vacuum deposition, sputtering,
A CVD method or the like can be used, but a vacuum evaporation method excellent in mass productivity is advantageous.

Next, the flame-retardant heat-bonding layer 3 and the conductive heat-bonding layer 4 provided alternately and adjacently in a pattern on the metal thin-film layer 2 respectively provide the heat-bonding resin with the flame-retardant property. It is formed of a resin layer containing an agent or a conductive filler. The heat-adhesive resin used for the flame-retardant heat-adhesive layer 3 and the conductive heat-adhesive layer 4 both adheres well to the metal thin film layer 2 and also covers the flat cable covering material and the exposed ground wire. It is necessary to heat-bond to the substrate, and a common heat-bonding resin can be used.

For example, polyester resins, polyolefin resins (including ionomers and other acid-modified polyolefin resins), polyvinyl acetate resins, polystyrene resins, acrylic resins, polyamide resins, and the like can be mentioned. One of them can be selected, or two or more can be mixed and used. In particular, a polyester film is often used for the outer layer of the covering material of the flat cable, and in that case, a polyester-based resin can be suitably used as the heat-adhesive resin. This polyester resin is a saturated copolymerized polyester resin, and especially has a glass transition point of -50 to 80C.
In addition, a resin composition containing a resin having a weight average molecular weight of 7000 to 50,000 as a main component is preferable.

In the flame-retardant heat-bonding layer 3, as the flame-retardant imparting agent to be contained in the heat-bonding resin, for example, chlorinated paraffin, chlorinated polyethylene, chlorinated polyphenyl, perchlorpentacyclodecane, anhydrous Chlorinated compounds such as het acid and chlorendic acid, and tetrabromoethane, tetrabromobisphenol A, hexabromobenzene, decabromobiphenyl ether, tetrabromophthalic anhydride, polydibromophenylene oxide, hexabromocyclodecane, ammonium bromide, etc. Organic or inorganic compounds containing a halogen element, such as bromine-based compounds, and triallyl phosphate, alkyl allyl phosphate, alkyl phosphate, dimethylphosphonate, phosphorinate, halogenated phosphorinate esters Trimethyl phosphate, tributyl phosphate, trioctyl phosphate, tributoxyethyl phosphate, octyl diphenyl phosphate, tricresyl phosphate, 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, polyphosphate, aromatic polyphosphate,
Phosphoric acid ester or phosphorus compound such as dibromoneopentyl glycol, phosphonate type polyol, phosphate type polyol, polyol compound such as halogen-containing polyol, aluminum hydroxide, magnesium hydroxide, antimony trioxide, antimony trichloride, antimony pentoxide, Zinc borate, antimony borate, boric acid, antimony molybdate, molybdenum oxide, phosphorus and nitrogen compounds, calcium and aluminum silicate, zirconium compounds, tin compounds, dawsonite, calcium aluminate hydrate, copper oxide, metallic copper powder, Metal powder and inorganic compounds such as calcium carbonate and barium metaborate, and others,
Silicone-based polymers, ferrocene, fumaric acid, maleic acid, triazine compounds, melamine cyanurate, isocyanurate, urea, guanidine compounds, etc. may be mentioned. be able to.

In the conductive heat bonding layer 4, as the conductive filler to be contained in the heat bonding resin, for example, metal powder such as silver, nickel, copper, aluminum, alloy powder such as solder, metal whisker, Metal-plated glass fiber powder, carbon particles and the like can be used. The particle diameter or length of such a conductive filler is preferably in the range of 0.01 to 15 μm, and particularly preferably in the range of 0.01 to 5 μm, which facilitates dispersion and pattern coating.

The method of forming the flame-retardant heat-bonding layer 3 and the conductive heat-bonding layer 4 formed by adding the flame-retardant-imparting agent or the conductive filler to the above-mentioned heat-bonding resin is as follows. Can be easily formed on the metal thin film layer 2 by means of, for example, screen printing, gravure printing, or the like, and applying and drying the metal thin film layer 2 in a pattern such as a striped pattern or a grid pattern. . In addition, in the case of the preparation of the coating liquid, in the case of a coating liquid for a flame-retardant heat-adhesive layer, one or two or more kinds of the heat-adhesive resin and one or more kinds of the flame-retardant imparting agent And, if necessary, a dispersant, a viscosity modifier, and other additives, and then mixing, dispersing, or dissolving to produce the composition. The content of the flame retardant is 20% of the solid content of the flame-retardant heat bonding layer 3.
The range is preferably from 80 to 80% by weight.

In the case of a coating solution for the conductive heat-adhesive layer, one or more solutions of the heat-adhesive resin may be used.
It can be prepared by adding the conductive filler and, if necessary, adding a dispersant, a viscosity modifier and other additives, and mixing, dispersing or dissolving. Although the content of the conductive filler varies depending on the material and shape of the conductive filler to be used, it cannot be said uniformly, but it is preferably in the range of 10 to 60% by weight of the solid content of the conductive heat bonding layer 4, and in particular, metal When a filler is used, the content is preferably 30 to 60% by weight. The solution of the heat-adhesive resin is usually a solution with an organic solvent, but depending on the type of the heat-adhesive resin, an aqueous solution
It may be an emulsion or dispersion based on a water-alcohol system or the like.

The thickness of the flame-retardant heat-bonding layer 3 and the thickness of the conductive heat-bonding layer 4 are 20 to 50 in the dry thickness.
μm is preferable, and 30 to 40 μm is more preferable. By forming the thickness of the flame-retardant thermal bonding layer 3 and the thickness of the conductive thermal bonding layer 4 to be the same in the above range, the volume ratio of the two is reduced by 50 to 95% by volume. Therefore, it is easy to form the conductive thermal bonding layer 4 so as to have the remaining 50 to 5% by volume because the pattern can be designed by the area ratio.

Also, by adopting such a configuration,
Since the flame-retardant heat bonding layer 3 can contain a sufficient amount of the flame-retardant imparting agent, the flexible insulating base material 1
Even when a PET film or the like is used, the oxygen index (JIS K7201-
2) In the flame retardancy of 21 or more, for example, oxygen index 25 to 3
5 can be easily imparted, and furthermore, by manufacturing a shielded flat cable using this shield material 10, the flat cable can pass a UL standard flame retardancy test. .

The conductive thermal adhesive layer 4 also has a surface resistivity of 10 Ω / □ required for conduction between the metal thin film layer 2 of the shield material 10 and the exposed ground wire of the flat cable.
Since the following materials are sufficiently provided and the entire surface of the metal thin film layer 2 is pattern-coated in a well-balanced manner, the flat cable shielding material 10 is used for the flame-retardant heat-bonding layer 3 and the conductive heat-bonding layer 4. The exposed ground wire of the flat cable and the metal thin film layer 2 of the shield material 10 are easily conducted by covering the outer periphery of the flat cable with the forming surface facing inward and heating and applying pressure from the outside. And excellent shielding properties can be provided.

[0033]

The present invention will be described more specifically below with reference to examples. However, unless the present invention exceeds the gist,
It is not limited to the embodiment. Example 1 A flat cable shielding material 10 having the structure shown in FIG. 1 was produced, and a 12 μm-thick PET film (one-sided corona discharge treatment) was used for a flexible insulating base material 1. On the corona discharge treated surface, an aluminum vapor-deposited layer having a thickness of 0.1 μm is formed as a metal thin film layer (shield layer) 2.
Using a coating solution for the flame-retardant heat-bonding layer having the following composition and a coating solution for the conductive heat-bonding layer, each was dried by screen printing to a thickness of 30 μm and a width of 7 mm in an oblique direction. Printing and heating and drying so that the flame-retardant heat-bonding layer 3 having a stripe pattern and the conductive heat-bonding layer 4 having a stripe pattern having a width of 3 mm are alternately formed, and the flat cable shield of Example 1 is formed. Material 10 was produced.

(Composition of Coating Solution for Flame Retardant Thermal Adhesive Layer) Thermal adhesive resin (saturated copolymerized polyester resin) 50 parts by weight Flame retardant imparting agent Bromine flame retardant 30 parts by weight Antimony trioxide 10 parts by weight Water Aluminum oxide 10 parts by weight Solvent (MEK: toluene weight ratio 1: 1) 180 parts by weight (Note) MEK is methyl ethyl ketone

(Composition of Coating Solution for Conductive Thermal Adhesive Layer) Thermal adhesive resin (saturated copolymerized polyester resin) 70 parts by weight Conductive filler (silver powder, major axis 1 to 3 μm) 30 parts by weight Solvent (MEK: toluene weight) Ratio 1: 1) 160 parts by weight

The flame retardancy of the flat cable shield material 10 produced as described above was 29 in oxygen index.
The surface specific resistance of the conductive heat bonding layer 4 was 10Ω / □. Next, the flat cable shielding material 1
Using 0, a shielded flat cable 100 having the configuration shown in FIGS. 2A and 2B was manufactured as follows. That is, as a flat cable, the thickness is 0.1 mm.
A plurality of conductors 5 made of a flat tinned annealed copper foil having a width of 1 mm and a width of 0.8 mm are arranged in parallel at a pitch of 1.25 mm between the conductors, and covered with a flat cable covering material 7 from both sides.
Using a flat cable produced by heating and pressurizing with a heated rubber roll to embed and integrate the conductor 5, the covering material 7 on one side of the conductor 5 at one end of the flat cable is continuously cut in the length direction to remove the conductor. After being exposed to form the ground wire 6, the outer periphery of the flat cable is turned by the flat cable shielding material 10 so that the surface on which the flame-retardant heat bonding layer 3 and the conductive heat bonding layer 4 are formed faces inward. Flat cable 1 with shield, with both ends overlapped, heated and pressurized with heat rubber rolls from both sides, bonded by heat and integrated
00 was produced.

In the shielded flat cable 100 manufactured as described above, 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 4, conduction was easily achieved at the ground line-shield layer conduction portion 8, excellent flatness was imparted to the flat cable, and sliding characteristics were also excellent. Further, regarding the flame retardancy, it passed the UL standard flame retardancy test.

[0038]

As described above in detail, according to the present invention, there is provided a flat cable shielding material for imparting electromagnetic wave shielding to a flat cable, which has excellent flame retardancy and electromagnetic wave shielding. In addition to having sliding properties (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 excellent flame retardancy and electromagnetic wave shielding properties, and excellent performance such as sliding characteristics (bending resistance) with good productivity and economy.

[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]

 DESCRIPTION OF SYMBOLS 1 Insulating base material which has flexibility 2 Metal thin film layer (shield layer) 3 Flame retardant thermal bonding layer 4 Conductive thermal bonding layer 5 Conductor 6 Ground wire 7 Flat cable covering material 8 Ground wire-shield layer conduction part 10 Shield material for flat cable 100 Flat cable with shield

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E321 BB23 BB44 CC16 GG09 5G311 CB01 CD03 CE01 5G313 AA10 AB05 AC03 AC06 AD02 AE01 AE08 AE09

Claims (3)

[Claims] 1. One surface of a flexible insulating base material,
A metal thin film layer is provided as a shield layer, and on the metal thin film layer, a flame-retardant heat-adhesive layer comprising a heat-adhesive resin containing a flame retardant, and a conductive filler in the heat-adhesive resin. The conductive heat bonding layers contained therein are alternately provided in a pattern adjacent to each other, and the flame retardant heat bonding layer and the conductive heat bonding layer form A shielding material for a flat cable, wherein the heat-resistant heat-bonding layer is formed so as to have a volume of 50 to 95% by volume, and the remaining 50 to 5% by volume to be the conductive heat-bonding layer. 2. The flexible insulating base material is a biaxially stretched polyethylene terephthalate film, and the metal thin film layer is a 0.04 to 0.2 μm thick aluminum vapor-deposited layer. The shield material for a flat cable according to claim 1. 3. A flat cable with a shield, wherein the flat cable shielding material according to claim 1 or 2 is integrated by heating and pressurizing the flat cable with an outer periphery thereof.