JP2009272105A - Electromagnetic wave control cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic wave absorbing cable excellent in flexibility and foldability. <P>SOLUTION: In the electromagnetic wave control cable having an electromagnetic wave control part 3 around insulated core wires 1, the electromagnetic wave control part 3 has an electromagnetic wave absorbing resin layer (I) having electromagnetic wave absorbing performance with a value of reflection loss (S11) of -1 dB or less over a whole range of electromagnetic wave frequencies of 300 MHz to 18 GHz as measured on the basis of IEC-62333, and with a value of transfer loss (S21) of -1 dB or less over a whole range of electromagnetic wave frequencies of 300 MHz to 18 GHz, and an electromagnetic wave control flat yarn having either a resin layer (II) on one face of the electromagnetic wave absorbing resin layer (I), or a resin layer (II) on one face and a resin layer (III) on the other and knitted in a tube shape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electromagnetic wave suppression cable excellent in bendability.

  In recent years, with the reduction in size, performance, and speed of various electronic devices, electronic devices such as computer devices, printing devices, communication devices, OA devices, and FA devices can be used inside devices or between devices. There is a demand for cables that are highly effective in preventing electromagnetic interference for data transmission.

  Conventionally, in Patent Document 1, a plurality of data transmission signal wires are bundled or twisted, and a plurality of data transmission signal wire bundles having an insulating layer formed on the outer periphery thereof are bundled or twisted, and the outer periphery thereof is coated with a ferromagnetic metal layer. A data transmission cable covered with a braid of formed shield wire is disclosed.

  However, such a braid of metal shielded wire has a drawback that the signal wire is rigid, has no bendability, and is bent when bent.

  Patent Document 2 uses a woven fabric made of a metal wire, and Patent Document 3 uses a metal thin film for electromagnetic shielding. However, both of these cables have a large cable outer diameter, are inferior in flexibility, and are bent. If it is attached to a part, harness, or electric wire, there is a drawback that it is cracked or stiffened, resulting in poor bendability and higher cost.

  Patent Document 4 exemplifies a cable in which a ferrite core is attached to a cable in the vicinity of a connector. However, since the number of accessories increases and the overall size increases, it is also inferior in flexibility and increased in cost. There's a problem.

JP-A-11-162266 JP 2007-169804 A JP 2000-183563 A Japanese Utility Model Publication No. 61-76626

  Then, this invention makes it a subject to provide the electromagnetic wave suppression cable which is excellent in a softness | flexibility and excellent in bendability.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
In an electromagnetic wave suppressing cable having an electromagnetic wave suppressing part around an insulated core wire, the value of the reflection loss (S11) measured by the electromagnetic wave suppressing part in accordance with IEC-62333 is −1 dB over the entire electromagnetic wave frequency range of 300 MHz to 18 GHz. One surface of the electromagnetic wave absorbing resin layer (I) and the electromagnetic wave absorbing resin layer (I) having an electromagnetic wave absorbing performance that is equal to or lower than that and a transmission loss (S21) value is -1 dB or lower over the entire electromagnetic wave frequency range of 300 MHz to 18 GHz An electromagnetic wave suppression cable comprising an electromagnetic wave suppression flat yarn having a resin layer (II) on one side or having a resin layer (II) on one side and a resin layer (III) on the other side in a tube shape .

(Claim 2)
The electromagnetic wave suppressing cable according to claim 1, wherein the electromagnetic wave absorbing resin layer (I) of the electromagnetic wave suppressing flat yarn is made of a polyurethane resin and metal particle powder and / or carbon black powder having electromagnetic wave absorbing performance.

(Claim 3)
An electromagnetic wave suppressing cable with a connector, wherein connectors are provided at both ends or one end of the electromagnetic wave suppressing cable according to claim 1.

  ADVANTAGE OF THE INVENTION According to this invention, the electromagnetic wave suppression cable excellent in a softness | flexibility and excellent in a bendability can be provided.

  Embodiments of the present invention will be described below.

  In FIG. 1, reference numeral 1 denotes a core wire such as a conductor cable, and the periphery of the core wire 1 is insulated by an insulating resin layer 2.

  Reference numeral 3 denotes an electromagnetic wave suppression unit, and its periphery is protected by a protective layer 4.

  The electromagnetic wave suppression unit 3 is obtained by knitting an electromagnetic wave suppression flat yarn used in the present invention (hereinafter, referred to as “electromagnetic wave suppression flat yarn of the present invention” if necessary) into a tube shape.

  The electromagnetic wave suppression flat yarn of the present invention has a reflection loss (S11) value measured in accordance with IEC-62333 of −1 dB or less over the entire electromagnetic wave frequency range of 300 MHz to 18 GHz, and a transmission loss (S21) value. The electromagnetic wave absorbing resin layer (I) having an electromagnetic wave absorbing performance of −1 dB or less over the entire electromagnetic wave frequency range of 300 MHz to 18 GHz and the resin layer (II) on one side of the electromagnetic wave absorbing resin layer (I), or on one side The resin layer (II) and the resin layer (III) are provided on the other surface.

  That is, it has a resin layer (II) on one side of the electromagnetic wave absorbing resin layer (I), or a laminated structure having a resin layer (II) on one side and a resin layer (III) on the other side. It is excellent in flexibility, and is excellent in its own strength, and is excellent in flexibility such as a knitted fabric manufactured using the same. As a result, even if the cable is bent, it does not break.

  In the present invention, the transmission loss (S21) and reflection loss (S11) of the electromagnetic wave absorbing resin layer (I) are defined, but the same applies to the case where the electromagnetic wave suppressing flat yarn of the present invention is applied to a woven fabric or a knitted fabric. Characteristics can be obtained. Conventionally, a flat yarn using an electromagnetic wave absorbing resin layer (I) in which both transmission loss (S21) and reflection loss (S11) exhibit predetermined characteristics is not known, and the present inventors newly provide It is.

  In the present invention, suitable ranges of transmission loss (S21) and reflection loss (S11) are as shown in Table 1 below.

  Examples of the resin used for the electromagnetic wave absorbing resin layer (I) include polyurethane resin, polyester resin, butyral resin, acrylic resin, epoxy resin, vinyl chloride resin, polyacetal resin, vinyl acetate resin, and fluororesin. Among them, polyurethane resin Is preferable for exhibiting the flexibility and strength of the resin layer.

  The electromagnetic wave absorbing resin layer (I) contains metal particle powder having electromagnetic wave absorbability and / or powder of conductive material.

Examples of the metal having electromagnetic wave absorption include one, two or more alloys selected from aluminum, copper, nickel, silver, zinc, tin, chromium, gold, platinum, iron, cobalt, zirconium, molybdenum, and titanium, halogen In particular, an alloy such as magnetite (Fe ₃ O ₄ ), Fe—Si—Al, or Fe ₃ Si, which is a magnetic powder, is preferable.

  The metal particle powder having electromagnetic wave absorbability is preferably used after being pulverized by a pulverizer and then classified to remove coarse particles.

  The average particle size of the powder particles after classification is preferably in the range of 0.1 to 200 μm, more preferably 0.15 to 150 μm, and particularly preferably 0.2 to 100 μm.

  In the present invention, the particle size distribution is set by selecting the mesh size of the sieve, and the mesh size of the sieve is preferably 250 μm, more preferably 200 μm, and particularly preferably 125 μm.

  If metal particle powder that does not remove coarse particles by classification is used, a portion protruding from the surface of the electromagnetic wave absorbing resin layer (I) may be generated, and pinholes and bubbles may be generated in the resin layer, producing flat yarn. There is a risk of breakage.

  The shape of the metal particle powder may be any shape such as a spherical shape, a flat shape, a rod shape, a needle shape, or an indefinite shape.

  An example of the conductive powder is carbon black. The average particle size of carbon black is preferably 10 to 60 nm. The average particle diameter is measured by an arithmetic average method using an electron microscope.

  The blending amount is preferably 0 to 900 parts by weight for the metal particle powder having electromagnetic wave absorption with respect to 100 parts by weight of the resin, and 10 to 500 parts by weight for the carbon black.

  The electromagnetic wave absorbing resin layer (I) is preferably blended with a flame retardant (for example, melamine-coated ammonium polyphosphate), and various other additives such as organic pigments, inorganic pigments, light stabilizers, and the like. Can be added.

  The thickness of the electromagnetic wave absorbing resin layer (I) is preferably in the range of 5 to 500 μm, more preferably in the range of 10 to 100 μm.

  The present invention includes a mode in which the resin layer (II) is laminated on one surface of the electromagnetic wave absorbing resin layer (I), or the resin layer (II) is laminated on one surface and the resin layer (III) is laminated on the other surface. If necessary, an intermediate layer may be provided between the electromagnetic wave absorbing resin layer (I) and the resin layer (II) or the resin layer (III). Furthermore, a resin layer can be provided on the outer surface of the resin layer (II) or the resin layer (III).

  As the resin used for the resin layer (II) or the resin layer (III), the resin used for the electromagnetic wave absorbing resin layer (I) can also be used, and further, polyester resin, polyetherimide resin, polyimide resin, polyphenylene sulfide resin In particular, one type selected from a polyester resin layer, a polyetherimide resin layer, a polyimide resin layer, a polyphenylene sulfide resin layer, or a polyurethane resin layer is preferable.

  The resin layer (II) and the resin layer (III) preferably contain a flame retardant (eg, melamine-coated ammonium polyphosphate), and various other organic pigments, inorganic pigments, light stabilizers and the like as necessary. Additives can be added.

  The resin layer (II) and the resin layer (III) can be formed by using or coating the product film as it is.

  The weight average molecular weight of the resin used for coating formation is preferably 50,000 to 1,000,000, and if it falls below this range, practical physical properties cannot be obtained, and if it exceeds this range, the melt viscosity or viscosity when dissolved with a solvent is high. Since it is too high, it is inferior to the film-forming processability at the time of resin layer formation.

  The glass transition point of the resin used for the resin layer (II) or the resin layer (III) is preferably −20 ° C. or higher, more preferably −10 ° C. or higher. If the lower limit is not reached, the obtained flat yarn may cause blocking.

  When providing resin layer (II) and resin layer (III), the same resin may be used and another resin may be used.

  Therefore, the layer structure of the electromagnetic wave suppressing flat yarn of the present invention is the two-layer structure of electromagnetic wave absorbing resin layer (I) / resin layer (II), resin layer (III) / electromagnetic wave absorbing resin layer (I) / resin layer (II ) And the like.

  Next, an example of the manufacturing method of the electromagnetic wave suppression flat yarn of this invention is demonstrated below.

  For example, a polyurethane resin used for the electromagnetic wave absorbing resin layer (I) is dissolved in a solvent to prepare a resin solution. As the solvent, N, N-dimethylformamide (DMF), toluene, methyl ethyl ketone (MEK) and the like can be mixed and used.

  Next, the above-mentioned resin solution is mixed with the metal particle powder and / or the carbon black powder to prepare an electromagnetic wave absorbing resin composition solution. The stirring and mixing means is not particularly limited.

  In the present invention, both metal particle powder and carbon black powder may be used, or any one of them may be used. The metal particle powder is preferably used after pulverization with a pulverizer and classification to remove coarse particles.

  Next, on the resin layer (II), the electromagnetic wave absorbing resin composition solution is applied and dried using, for example, a doctor blade to form the electromagnetic wave absorbing resin layer (I) to produce a two-layer electromagnetic wave suppressing film. To do.

  The drying temperature is preferably 50 to 250 ° C., and the drying time is preferably 5 seconds to 30 minutes.

  Moreover, the resin layer (III) is formed on the surface of the electromagnetic wave absorbing resin layer (I) opposite to the resin layer (II) to produce an electromagnetic wave suppression film having a three-layer structure.

  The following method different from the above-described method for producing a laminated film is also preferable.

  A resin solution in which a polyurethane resin is dissolved in a solvent, and metal particle powder and / or carbon black powder are stirred and mixed to prepare an electromagnetic wave absorbing resin composition solution, and the electromagnetic wave absorbing resin composition solution is applied to the release paper and dried. Forming the electromagnetic wave absorbing resin layer (I), forming the resin layer (II) on the electromagnetic wave absorbing resin layer (I), and then peeling the release paper to produce a laminated film. You can also.

  Next, the laminated film manufactured as described above is slit. A slit means is not specifically limited, A normal slitter (cutter) can be used.

  The electromagnetic wave suppression flat yarn of the present invention can be obtained by the slit.

  The thickness of the electromagnetic wave suppressing flat yarn of the present invention is not limited at all and can be arbitrarily set according to the purpose, but is generally 50 to 10,000 dtex, preferably 100 to 5,000. Decitex, more preferably 150 to 3,000 decitex.

  The thickness of the electromagnetic wave suppressing flat yarn of the present invention is preferably 5 to 1000 μm, more preferably 10 to 500 μm.

  The width of the electromagnetic wave suppression flat yarn of the present invention is preferably 0.3 to 100 mm, more preferably 0.4 to 80 mm, still more preferably 0.45 to 50 mm, and particularly preferably 0.5 to 5 mm. is there.

  As for the intensity | strength of the electromagnetic wave suppression flat yarn of this invention, 0.005-100 N / mm is preferable, More preferably, it is 0.01-50 N / mm. If it is less than 0.005 N / mm, the binding strength is poor, so it is not practical. If it exceeds 100 N / mm, the strength is too strong, so that it becomes too hard and a flexible sheet cannot be obtained.

  The elongation of the electromagnetic wave suppressing flat yarn is preferably in the range of 5 to 1000%, more preferably in the range of 10 to 50%. If it is less than 5%, the resulting cloth or sheet has poor flexibility and followability, and has low impact resistance. If it exceeds 1000%, the mechanical stability decreases because the elongation is too large.

  In this invention, as shown in FIG. 1, the electromagnetic wave suppression part 3 which is the braided layer is provided by knitting the above electromagnetic wave suppression flat yarn in a tube shape.

  The braided layer may be formed by alternately braiding a metal wire and other fiber materials. Examples of the metal wire include a single wire of a metal wire such as a stainless wire, a copper wire, a tin-plated copper wire, and an alloy copper wire, and a bundle. Materials and the like. The fiber material may be either a natural fiber material or an artificial fiber material, such as cotton yarn, silk yarn, polyvinyl alcohol fiber, polyethylene terephthalate fiber, polyethylene naphthalate fiber, polyethylene fiber, polypropylene fiber, nylon fiber, etc. Can be mentioned. The cross-sectional shapes of the metal wire and the fiber material are not particularly limited, and examples thereof include a circular shape, an elliptical shape, and a rectangular shape, but the cross-sectional shape and size are preferably about the same from the workability of weaving and weaving.

  There are two types of knitting: warp knitting (warp melias) and weft knitting (wet melias). Flat knitting (weft melias) includes flat knitting, rubber knitting and pearl knitting. , One-handed knitting, lace, two-handed knitting. As warp knitting, there are a closed stitch and an open stitch, and variations thereof include Miranese, tricot, and mesh. Russell knitting may also be used.

  As shown in FIG. 2, the electromagnetic wave suppression cable of the present invention can be provided with connectors 5 and 6 at both ends thereof to provide an electromagnetic wave suppression cable with a connector. Examples of the connector include various commercially available cable connectors such as a round connector, a square connector, a coaxial connector, a modular connector, and a board / cable connector.

  MIL-C-5015 compliant round multipolar connector, JIS-C-5423 compliant round connector, USB connector, mini USB connector, IEEE 1394 compliant connector, D-sub connector, high-density D-sub connector, amphenol type connector, edge connector, PS / 2 connector, modular plug (RJ-11), DS connector, FC connector, LAN terminal (RJ-45), LC connector, MPO connector, MT connector, MU connector, SC connector, V.P. 35 connector, HDMI standard connector, standard plug jack, mini plug jack, RCA connector, DIN connector, mini DIN connector, XIR connector, AC power connector, EIAJ standard connector, BNC connector, M type connector, N type connector, Examples include TNC connectors, F-type connectors, SMA connectors, and cellular phone connectors.

  The cable in the present invention may be a transmission signal cable, a flat cable having a flat cross section, or the like, and a connector having a shape that matches the cross-sectional shape of the cable or the like is arbitrarily used. As cables, commercially available single wires, stranded wires, shielded wires, flat cables, flexible flat cables, etc. are used. Cables for underground cable paths such as OF cables, high-voltage cross-linked polyethylene power cables, cross-linked polyethylene power cables, corrugated cables, Vinyl insulated vinyl sheathed cable (VV) round type / flat type, cross-linked polyethylene insulated vinyl sheathed cable (CV) -duplex type (CVD), triplex type (CVT), Kadralex type (CVQ), branched cable, unit cable, etc. Cables for fire-fighting equipment such as indoor wiring cables, fireproof cables (FP-C) and heat-resistant cables (HP), control circuit cables such as control cables (CVV), cabtire cables, elevator cables, and other power equipment Cable, inorganic insulation High temperature locations such as Bull (MI), marine cables, cables for undercarpet wiring such as flat cables, and twisted pair cables, polyethylene insulated vinyl sheathed cable (CPEV), polyethylene insulated polyethylene sheathed cable (CPEE), polyethylene insulated (LAP) sheath UTP cables such as category 5 and category 5e (enhanced category 5, category 6, category 3) as twisted pair cables for local lines such as cables (CCP), polyethylene foam insulated (LAP) sheathed cables (PEC), etc. And coaxial cables such as LAN cables, CATV coaxial cables, television receiving coaxial cables, radio coaxial cables, leaky coaxial cables, and the like.

  Examples of the present invention will be described below, but the present invention is not limited to such examples.

Example 1
As the metal particle powder, Fe ₃ O ₄ (magnetite) powder is pulverized by a pulverizer and then classified to remove coarse particles. The average particle size was 5 μm.

  300 parts by weight of the magnetite powder after classification, 100 parts by weight of carbon black powder as a conductive material, and 100 parts by weight of polyurethane, 300 parts by weight of N, N-dimethylformamide (DMF), 30 parts by weight of toluene and methyl ethyl ketone ( MEK) A solution dissolved in 170 parts by weight was stirred and mixed to obtain an electromagnetic wave suppressing resin composition solution.

  The obtained electromagnetic wave suppressing resin composition solution was applied onto a release paper using a doctor blade and dried at 140 ° C. for 3 minutes to obtain an electromagnetic wave absorbing resin layer (I) having a thickness of 60 μm.

  Furthermore, a polyurethane solution obtained by dissolving 100 parts by weight of a polyurethane resin in 150 parts by weight of DMF and 100 parts by weight of toluene, 130 parts by weight of a melamine-coated ammonium polyphosphate flame retardant as a flame retardant, and 170 parts by weight of MEK as a solvent is stirred and mixed with the electromagnetic wave. On the absorbent resin layer (I), it was similarly applied and dried using a doctor blade to form a resin layer (II). Thereafter, the release paper was peeled off to obtain an electromagnetic wave suppression film having a thickness of 110 μm and a two-layer structure.

  The obtained film was slit with a cutter to obtain an electromagnetic wave suppressing flat yarn having a thickness of 110 μm and a width of 3 mm.

  A braided layer was formed on the outer periphery of a conductor core having an outer diameter of φ = 5.5 mm in accordance with the enhanced category 5 obtained by twisting two sets of φ = 0.52 mm copper wire conductors of the obtained flat yarn.

  Thereafter, ethylene propylene diene rubber was extruded and laminated to form a sheath layer, thereby obtaining an electromagnetic wave suppressing cable. The thickness of the braided layer was 0.25 mm, the thickness of the sheath layer (ethylene propylene diene rubber layer) was 1.5 mm, and the outer diameter φ was 9 mm.

  An RJ45 connector was crimped to both ends of this cable to obtain an electromagnetic wave suppression cable with a connector.

Example 2
As a conductive material, 100 parts by weight of carbon black powder, 100 parts by weight of polyurethane resin, dissolved in 300 parts by weight of DMF, 30 parts by weight of toluene and 170 parts by weight of MEK were mixed with stirring to obtain an electromagnetic wave suppressing resin composition solution. .

  The obtained electromagnetic wave suppressing resin composition solution was applied on a polyester (PET) film (unit: “S-25” manufactured by Unitika) (resin layer (II)) having a thickness of 25 μm using a doctor blade, and 3 ° C. at 3 ° C. Drying for 5 minutes gave an electromagnetic wave absorbing resin layer (I) having a thickness of 50 μm.

  Furthermore, a polyurethane solution prepared by dissolving 100 parts by weight of a polyurethane resin in 150 parts by weight of DMF and 100 parts by weight of toluene, 130 parts by weight of a melamine-coated ammonium polyphosphate flame retardant, and 170 parts by weight of MEK as a solvent was mixed with an electromagnetic wave absorbing resin layer (I ) (The surface opposite to the surface on which the resin layer (II) is laminated) is similarly applied and dried using a doctor blade to form the resin layer (III), and a three-layer electromagnetic wave having a thickness of 130 μm. A suppression film was obtained.

  The obtained film was slit with a cutter to obtain an electromagnetic wave suppressing flat yarn having a thickness of 130 μm and a width of 3 mm.

  A braided layer was formed on the outer periphery of a conductor core having an outer diameter of φ = 5.5 mm in accordance with the enhanced category 5 obtained by twisting two sets of φ = 0.52 mm copper wire conductors of the obtained flat yarn.

  Thereafter, ethylene propylene diene rubber was extruded and laminated to form a sheath layer, thereby obtaining an electromagnetic wave suppressing cable.

  The thickness of the braided layer was 0.25 mm, the thickness of the sheath layer (ethylene propylene diene rubber layer) was 1.5 mm, and the outer diameter φ was 9 mm.

  An RJ45 connector was crimped to both ends of this cable to obtain an electromagnetic wave suppression cable with a connector.

Example 3
The particle size D ₅₀ obtained by pulverizing and flattening a Fe-Si-Al-based alloy material as a metal particle powder in a medium stirring mill using toluene as a solvent and then classifying and removing coarse particles is 35 μm. 150 parts by weight of flat Fe-Si-Al based powder, 100 parts by weight of carbon black powder as a conductive material, and 100 parts by weight of polyurethane were dissolved in 300 parts by weight of DMF, 30 parts by weight of toluene and 170 parts by weight of MEK. By mixing, an electromagnetic wave absorbing resin composition solution was obtained.

  The obtained electromagnetic wave suppressing resin composition was applied onto a polyimide (PI) film (“Kapton 50H” manufactured by Toray DuPont) (resin layer (II)) having a thickness of 12.5 μm using a doctor blade, and 140 ° C. Were dried for 3 minutes to obtain an electromagnetic wave absorbing resin layer (I) having a thickness of 50 μm, and an electromagnetic wave suppressing film having a two-layer structure of about 63 μm in thickness was obtained.

  The obtained film was slit with a cutter to obtain an electromagnetic wave suppressing flat yarn having a thickness of 63 μm and a width of 2 mm.

  A braided layer was formed on the outer periphery of a conductor core having an outer diameter of φ = 5.5 mm in accordance with the enhanced category 5 obtained by twisting two sets of φ = 0.52 mm copper wire conductors of the obtained flat yarn.

  Thereafter, ethylene propylene diene rubber was extruded and laminated to form a sheath layer, thereby obtaining an electromagnetic wave suppressing cable.

  The thickness of the braided layer was 0.25 mm, the thickness of the sheath layer (ethylene propylene diene rubber layer) was 1.5 mm, and the outer diameter φ was 9 mm.

  An RJ45 connector was crimped to both ends of this cable to obtain an electromagnetic wave suppressing cable with a connector.

Example 4
In place of 150 parts by weight of the Fe—Si—Al alloy powder used in Example 3, electromagnetic waves were obtained in the same manner as in Example 3 except that 50 parts by weight of Fe ₃ Si powder that was similarly pulverized and flattened and classified was used. An inhibitory resin composition solution was obtained.

  The obtained electromagnetic wave suppressing resin composition was applied onto a 25 μm-thick polyphenylene sulfide (PPS) film (“Torelina 3030” manufactured by Toray (resin layer (II)) using a doctor blade and dried at 140 ° C. for 3 minutes. Thus, an electromagnetic wave absorbing resin layer (I) having a thickness of 50 μm was obtained, and an electromagnetic wave suppressing film having a two-layer structure having a thickness of about 75 μm was obtained.

  The obtained film was slit with a cutter to obtain an electromagnetic wave suppressing flat yarn having a thickness of 75 μm and a width of 3 mm.

  A braided layer was formed on the outer periphery of a conductor core having an outer diameter of φ = 5.5 mm in accordance with the enhanced category 5 obtained by twisting two sets of φ = 0.52 mm copper wire conductors of the obtained flat yarn.

  Thereafter, ethylene propylene diene rubber was extruded and laminated to form a sheath layer, thereby obtaining an electromagnetic wave suppressing cable.

  The thickness of the braided layer was 0.25 mm, the thickness of the sheath layer (ethylene propylene diene rubber layer) was 1.5 mm, and the outer diameter φ was 9 mm.

  An RJ45 connector was crimped to both ends of this cable to obtain an electromagnetic wave suppression cable with a connector.

Comparative Example 1
After mixing 7 parts by weight of Ni—Cu—Zn-based ferrite powder having an average particle diameter of 3 μm and 3 parts by weight of carbon powder as metal particle powder, 90 parts by weight of polyvinyl chloride was stirred and kneaded to obtain an electromagnetic wave suppressing resin composition. It was.

  The resulting composition is extruded on the outer periphery of a conductor core having an outer diameter of φ = 5.5 mm in conformity with enhanced category 5 in which four pairs of φ = 0.52 mm copper wire conductors are twisted to form an electromagnetic wave suppression layer. Thereafter, ethylene propylene diene rubber was extruded and laminated to form a sheath layer, thereby obtaining an electromagnetic wave suppressing cable.

  The thickness of the braided layer was 0.25 mm, the thickness of the sheath layer (ethylene propylene diene rubber layer) was 1.5 mm, and the outer diameter φ was 9.5 mm.

  An RJ45 connector was crimped to both ends of this cable to obtain an electromagnetic wave suppressing cable with a connector.

[Evaluation]
About the electromagnetic wave suppression cable produced in Examples 1-4 and the comparative example 1, the transmission loss (S21) and the reflection loss (S11) were measured, and the flexibility was evaluated.

  The transmission loss (S21) and the reflection loss (S11) were measured using the transmission attenuation power ratio measurement system (compliant with IEC62333-1, IEC62333-2) manufactured by Keycom Corporation for the electromagnetic wave suppression film prepared above.

The bendability was evaluated according to the following evaluation criteria by measuring the curvature (diameter) that can be achieved without bending when the cable is bent.
○: Less than 50 mm Δ: 50 mm or more and less than 100 mm ×: 100 mm or more

  Table 2 shows the composition of Examples 1 to 4 and Comparative Example 1, the measurement results of the transmission loss (S21) and the reflection loss (S11), and the evaluation results of the flexibility.

The principal part notch perspective view which shows an example of the electromagnetic wave suppression cable of this invention The figure which shows the example of the electromagnetic wave suppression cable with a connector of this invention

Explanation of symbols

1: Core wire 2: Insulating resin layer 3: Electromagnetic wave suppression part 4: Protective layer 5, 6: Connector

Claims (3)

In the electromagnetic wave suppression cable having an electromagnetic wave suppression part around the insulated core wire,
The value of the reflection loss (S11) measured by the electromagnetic wave suppression unit according to IEC-62333 is -1 dB or less over the entire electromagnetic wave frequency range of 300 MHz to 18 GHz, and the value of the transmission loss (S21) is 300 MHz to The electromagnetic wave absorbing resin layer (I) having an electromagnetic wave absorbing performance of −1 dB or less over the entire region of 18 GHz and the resin layer (II) on one surface of the electromagnetic wave absorbing resin layer (I), or the resin layer (II ) And an electromagnetic wave suppression flat yarn having a resin layer (III) on the other surface is knitted into a tube shape.   The electromagnetic wave suppressing cable according to claim 1, wherein the electromagnetic wave absorbing resin layer (I) of the electromagnetic wave suppressing flat yarn is made of a polyurethane resin and metal particle powder and / or carbon black powder having electromagnetic wave absorbing performance.   An electromagnetic wave suppressing cable with a connector, wherein connectors are provided at both ends or one end of the electromagnetic wave suppressing cable according to claim 1.

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