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WO2000074080A1 - Article blinde contre le brouillage electromagnetique et le brouillage radioelectrique - Google Patents

Article blinde contre le brouillage electromagnetique et le brouillage radioelectrique Download PDF

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Publication number
WO2000074080A1
WO2000074080A1 PCT/US2000/015227 US0015227W WO0074080A1 WO 2000074080 A1 WO2000074080 A1 WO 2000074080A1 US 0015227 W US0015227 W US 0015227W WO 0074080 A1 WO0074080 A1 WO 0074080A1
Authority
WO
WIPO (PCT)
Prior art keywords
article
shielding layer
metal plated
metal
plated fibers
Prior art date
Application number
PCT/US2000/015227
Other languages
English (en)
Inventor
Ernest R. Fenton
Louis G. Morin, Jr.
Original Assignee
Composite Materials, L.L.C.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Composite Materials, L.L.C. filed Critical Composite Materials, L.L.C.
Priority to AU54591/00A priority Critical patent/AU5459100A/en
Publication of WO2000074080A1 publication Critical patent/WO2000074080A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H01B11/1058—Screens specially adapted for reducing interference from external sources using a coating, e.g. a loaded polymer, ink or print

Definitions

  • the present invention relates to an article, specifically a wire or cable, which has been shielded against electromagnetic interference (EMI) and radio frequency interference (RFI) by a coating or layer that includes metal plated conductive fibers.
  • EMI electromagnetic interference
  • RFID radio frequency interference
  • wires and cables include coaxial cables, utilize a metal foil or woven, served, or braided wire filaments as an electrically conductive shielding layer to inhibit interfering signals from reaching the center conductor.
  • metal coated fibers in which the base fiber is carbon, graphite, fiberglass, aramid, stainless steel, or steel nano-fibers have been used as discontinuous fillers molded in an insulating matrix into rigid shielding structures.
  • discontinuous fillers The shielding effectiveness of such discontinuous fillers is known to be directly proportional to the amount of filler used. Therefore, while shielding properties increase with increasing amounts of filler, other non-desirable properties, such as stiffness and weight of the resulting product also increase. Accordingly, the material not only becomes difficult to fabricate, but the resulting shield structure loses its ability to bend or twist without creating shielding gaps, or "windows," thus rendering objects enclosed within the shield structure susceptible to EMI and RFI. Thus, while discontinuous fiber-based shielding material may find uses in molded structures, its use in wires and cables is limited.
  • the present invention utilizes metal plated conductive fibers as an integral part of a shielding layer, rather than a separate layer.
  • This new shielding layer can be used alone or in combination with a conventional metal shielding layer.
  • the small diameter associated with such metal plated fibers not only enables a large amount of metal plated fiber to be incorporated into the shielding layer, which increases shielding effectiveness, but allows the product to be fabricated by high speed extrusion. Unlike the prior art, therefore, the present invention offers improved shielding effectiveness, enhanced rate of fabrication and decreased cost.
  • a subject of the present invention is an article comprising an inner conductor formed of at least one electrically conductive wire; an insulating layer surrounding the inner conductor; and a first shielding layer surrounding the insulating layer, the first shielding layer comprising a plurality of metal plated fibers in an insulating polymer matrix, the metal plated fibers being present in an amount effective to shield against EMI and RFI.
  • the invention provides a method of producing an article comprising an inner conductor formed of at least one electrically conductive wire, an insulating layer surrounding the inner conductor; and a first shielding layer surrounding the insulating layer.
  • the first shielding layer comprises a plurality of metal plated fibers in an insulating polymer matrix, wherein the metal plated fibers being present in an amount effective to shield against EMI and RFI.
  • the method comprises extruding the insulating layer over the wire; and extruding the first shielding layer over the insulating layer and wire.
  • Fig. 1 illustrates an article comprising an inner conductive core, a dielectric insulating layer, an extruded metal plated fiber shield, an optional drain wire, and an outer jacket;
  • Fig. 2 illustrates an article comprising an inner conductive core, a dielectric insulating layer, a metal shield layer, an extruded metal plated fiber shield and an outer jacket;
  • Fig. 3 illustrates the article of Fig. 2, wherein the metal shield layer is in the form of a helically wrapped metal plated fiber tape over an optional braided or served metal shield layer;
  • Fig. 4 illustrates the article of Fig. 2, wherein the metal shield layer is in the form of a longitudinally wrapped metal plated fiber tape over an optional braided or served metal shield layer;
  • Fig 5. illustrates the article of Fig. 2, wherein the inner conductive core comprises a plurality of individually insulated wires with an optional extruded inner dielectric layer and an optional braided or served metal shield.
  • Fig. 1 shows a cable 10 constituting an embodiment consistent with the present invention.
  • the cable 10 includes a center conductor 12, usually copper, covered by a primary dielectric insulating layer 14 such as PVDF, which is covered by an extruded metal plated fiber shield 16. Over the shielding layer 16 is an outer jacket 18, which can comprise ETFE, cross-linked ETFE, FEP, or other suitable polymers.
  • the cable 10 is shown with an optional drain wire 20.
  • Fig. 2 shows a second embodiment of cable 10 including a braided or served metal shield 30.
  • Fig. 3 shows a third embodiment of cable 10, wherein the first shielding layer comprises a helically wrapped tape formed of metal plated fibers in a polymer matrix 40.
  • Fig. 4 shows a fourth embodiment of cable 10, wherein the first shielding layer comprises a longitudinally wrapped tape formed of metal plated fibers in a polymer matrix 50.
  • Fig. 5 shows a fifth embodiment of cable 10 consistent with the present invention.
  • This embodiment includes a plurality of center conductors 60, individually covered by a primary insulating layer 62, which is optionally covered by an extruded inner dielectric layer 64.
  • the inner dielectric layer 64 is shown covered by an optional braided or served metal shield 66, which is covered by an extruded metal plated fiber shield 68.
  • Over the shielding layer 68 is an outer jacket 70.
  • the present invention is directed to an article comprising: an inner conductor formed of at least one electrically conductive wire; an insulating layer surrounding the inner conductor; and a first shielding layer surrounding the insulating layer.
  • the first shielding layer comprises a plurality of metal plated fibers in an insulating polymer matrix. According to the present invention, the metal plated fibers are present in an amount effective to shield against EMI and RFI.
  • the article may also comprise an outer jacket of insulating material surrounding the first shielding layer.
  • the metal plated fiber of the present invention comprises a core material of carbon, glass, polymer or metal, which is covered with a fiber layer formed of material selected from the group consisting of electroplated metal, chemical vapor deposited metal, and electroless plated metal.
  • the core material comprises aramid, fiberglass, graphite, stainless steel.
  • an article fabricated with a layer comprising a metal plated fiber in an insulating polymer matrix is not only lighter in weight than traditional articles having a separate metal shield layer, but has improved flexibility and shielding properties over these traditional articles.
  • the article comprises a second shielding layer of metal disposed over the insulating layer, the second shielding layer being formed by a process selected from the group consisting of weaving, braiding, and serving. If necessary, the article can further comprise a drain wire disposed in electrical contact with the first shielding layer.
  • the metal plated fiber can comprise a core material covered with a fiber layer formed of material selected from the group consisting of magnetic material and ferromagnetic material.
  • metal plated fibers are coated with a sizing agent and cut to a length from about 20 microns to about 65 millimeter before incorporation into the polymer matrix, improvement is realized in both the process and the resulting properties.
  • the wetting properties between the metal coated fibers and the polymer matrix are enhanced when a coating formed of a sizing agent is applied to the metal plated fibers before they are incorporated into the polymer matrix.
  • a length-to-diameter aspect ratio of at least 700, preferably about 780, for the metal coated fibers allows the material to be extruded at high speeds by cross-head or other well-known extrusion techniques.
  • the layer comprising a metal plated fiber in an insulating polymer matrix may be extruded in the form of a tape, which can then be helically or longitudinally wrapped around the dielectric or around the optional woven, braided, or served metal layer.
  • the extruded tape can be fused to form a seamless shielding layer.
  • a conductive material in addition to a metal plated fiber, into the insulating polymer matrix.
  • This embodiment comprises a first shielding layer surrounding the insulating layer, wherein the first shielding layer comprises a plurality of metal plated fibers in a matrix, the matrix comprising an insulating polymer and a conductive filler material.
  • the metal plated fibers being present in an amount effective to shield against EMI and RFI.
  • the conductive material includes conductive powders, uncoated graphite fibers, and metal powders. More preferably, the conductive material comprises carbon black.
  • the combination of components presently used enables an extrusion method to produce an article comprising an inner conductor formed of at least one electrically conductive wire; an insulating layer surrounding the inner conductor; and a first shielding layer surrounding the insulating layer.
  • the first shielding layer comprising a plurality of metal plated fibers in an insulating polymer matrix, wherein the metal plated fibers being present in an amount effective to shield against EMI and RFI.
  • the method comprises extruding the insulating layer over the wire, and extruding the first shielding layer over the insulating layer and wire.
  • the process preferably utilizes a cross-head extruder in which the inner conductive wire is fed perpendicular to the extruder.
  • the method can further comprise forming a second shielding layer over the insulated wire prior to extruding the first shielding layer.
  • the step of forming the second shielding layer comprises forming the second shielding layer of conductive wires by one of weaving, braiding, and serving.
  • the step of extruding the first shielding layer can comprise feeding a continuous length of metal plated fiber or metal plated fiber in the form of chopped metal fibers into an extruder during extrusion.
  • the step of extruding the first shielding layer can comprises first compounding the metal plated fiber into a compound pellet and adding the compound pellet to an extruder during extrusion.
  • Such a compounding step includes mixing the metal plated fibers with an polymeric material and subsequently forming a pellet.
  • the preferred finished article is a wire, cable or coaxial cable.
  • Both the application as a wire, cable or coaxial cable, and the extrusion technique used to produce such an article preclude the use of metal filaments, flakes, needles or the like in the present application.
  • the sharp edges associated with the morphology of filaments, flakes or needles increase the likelihood that, during the extrusion process, they would cut through the various extruded layers and contact the conductive core. This potential of shorting out the cable or wire prohibits the use of a filler having sharp edges in the polymer matrix layer.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)

Abstract

L'invention concerne un article et un procédé de fabrication d'un article comprenant un conducteur intérieur formé d'au moins un fil électriquement conducteur ; une couche d'isolation entourant le conducteur intérieur et une première couche de blindage entourant la couche d'isolation. La première couche de blindage comprend une pluralité de fibres ayant subi un placage métallique dans une matrice polymère isolante, les fibres étant présentes en quantité suffisante pour assurer une protection contre le brouillage électromagnétique et le brouillage radioélectrique. La simplicité du processus alliée aux excellentes propriétés mécaniques et de blindage dont fait preuve le présent article font qu'il est utilisé comme fil ou câble blindé.
PCT/US2000/015227 1999-06-02 2000-06-02 Article blinde contre le brouillage electromagnetique et le brouillage radioelectrique WO2000074080A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU54591/00A AU5459100A (en) 1999-06-02 2000-06-02 An article shielded against emi and rfi

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13751899P 1999-06-02 1999-06-02
US60/137,518 1999-06-02

Publications (1)

Publication Number Publication Date
WO2000074080A1 true WO2000074080A1 (fr) 2000-12-07

Family

ID=22477789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/015227 WO2000074080A1 (fr) 1999-06-02 2000-06-02 Article blinde contre le brouillage electromagnetique et le brouillage radioelectrique

Country Status (2)

Country Link
AU (1) AU5459100A (fr)
WO (1) WO2000074080A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10152166A1 (de) * 2001-10-23 2003-05-08 Harman Becker Automotive Sys Elektrische Leitung
WO2004097855A1 (fr) * 2003-04-28 2004-11-11 N.V. Bekaert S.A. Cable plat souple a blindage contre les interferences electromagnetiques
DE102004010113B4 (de) * 2004-02-27 2011-10-06 Iprotex Gmbh & Co. Kg Schutzhülle zum Schutz vor elektromagnetischer Strahlung
AU2009251124B2 (en) * 2003-05-16 2012-12-06 Acorda Therapeutics, Inc. Proteoglycan degrading mutants for treatment of CNS
DE102012203638A1 (de) * 2012-03-08 2013-09-12 Tyco Electronics Amp Gmbh Kabel mit elektrischer Schirmung und Dichtung
GB2527777A (en) * 2014-07-01 2016-01-06 Tellurium Q Ltd Cable
CN112908549A (zh) * 2021-01-25 2021-06-04 郭智昊 一种铜包铝导体挤包绝缘电力电缆

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190940A2 (fr) * 1985-02-06 1986-08-13 RAYCHEM CORPORATION (a Delaware corporation) Câble et harnais d'atténuation de la haute fréquence
US5262592A (en) * 1991-02-19 1993-11-16 Champlain Cable Corporation Filter line cable featuring conductive fiber shielding
DE19728940A1 (de) * 1997-07-07 1999-01-14 Alsthom Cge Alcatel Kabel mit leitfähiger Schicht

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0190940A2 (fr) * 1985-02-06 1986-08-13 RAYCHEM CORPORATION (a Delaware corporation) Câble et harnais d'atténuation de la haute fréquence
US5262592A (en) * 1991-02-19 1993-11-16 Champlain Cable Corporation Filter line cable featuring conductive fiber shielding
DE19728940A1 (de) * 1997-07-07 1999-01-14 Alsthom Cge Alcatel Kabel mit leitfähiger Schicht

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10152166A1 (de) * 2001-10-23 2003-05-08 Harman Becker Automotive Sys Elektrische Leitung
DE10152166C2 (de) * 2001-10-23 2003-11-06 Harman Becker Automotive Sys Elektrische Leitung
US7507904B2 (en) 2001-10-23 2009-03-24 Harman Becker Automotive Systems Gmbh Electrical conductor
WO2004097855A1 (fr) * 2003-04-28 2004-11-11 N.V. Bekaert S.A. Cable plat souple a blindage contre les interferences electromagnetiques
AU2009251124B2 (en) * 2003-05-16 2012-12-06 Acorda Therapeutics, Inc. Proteoglycan degrading mutants for treatment of CNS
DE102004010113B4 (de) * 2004-02-27 2011-10-06 Iprotex Gmbh & Co. Kg Schutzhülle zum Schutz vor elektromagnetischer Strahlung
DE102012203638A1 (de) * 2012-03-08 2013-09-12 Tyco Electronics Amp Gmbh Kabel mit elektrischer Schirmung und Dichtung
US9613731B2 (en) 2012-03-08 2017-04-04 Te Connectivity Germany Gmbh Cable having electrical shielding and seal
GB2527777A (en) * 2014-07-01 2016-01-06 Tellurium Q Ltd Cable
GB2527777B (en) * 2014-07-01 2017-01-18 Tellurium Q Ltd Cable
CN112908549A (zh) * 2021-01-25 2021-06-04 郭智昊 一种铜包铝导体挤包绝缘电力电缆

Also Published As

Publication number Publication date
AU5459100A (en) 2000-12-18

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