EP0759624A1 - Câble électrique de télécommunication - Google Patents

Câble électrique de télécommunication Download PDF

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Publication number
EP0759624A1
EP0759624A1 EP96104781A EP96104781A EP0759624A1 EP 0759624 A1 EP0759624 A1 EP 0759624A1 EP 96104781 A EP96104781 A EP 96104781A EP 96104781 A EP96104781 A EP 96104781A EP 0759624 A1 EP0759624 A1 EP 0759624A1
Authority
EP
European Patent Office
Prior art keywords
cable
screen
shielding
foils
cable according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP96104781A
Other languages
German (de)
English (en)
Inventor
Manfred Dipl.-Ing. Obermeier
Ferdinand Grögl
Reinhold Göblmaier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexans Deutschland GmbH
Original Assignee
Alcatel Kabel AG and Co
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 Alcatel Kabel AG and Co filed Critical Alcatel Kabel AG and Co
Publication of EP0759624A1 publication Critical patent/EP0759624A1/fr
Withdrawn legal-status Critical Current

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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
    • H01B11/1016—Screens specially adapted for reducing interference from external sources composed of a longitudinal lapped tape-conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • H01B13/262—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping of an outer metallic screen

Definitions

  • the invention relates to an electrical cable for transmitting messages, in which at least one transmission element consisting of insulated electrical conductors is arranged in a cable core, in which the cable core is surrounded by a metallic screen and in which a jacket made of insulating material is fitted over the screen.
  • Such cables or lines are used, for example, in data technology, in open-loop and closed-loop control technology or in general in communications technology.
  • These cables are equipped with a metallic shield or a metallic shield to protect the transmission paths against external interference fields.
  • the shield also prevents interference radiation from such a cable.
  • a dense shield is required, which must also be effective in areas of more than 100 MHz, for example for data cables.
  • umbrellas consist, for example, of braids or ropes made of copper wires. Such umbrellas are no longer leakproof even at double frequencies at higher frequencies. Their application to the cable core is also complex. Shields designed as closed tubes, such as those used for high-frequency cables, are also expensive to manufacture. Cables equipped with it are also stiff.
  • the invention has for its object to develop the above-mentioned cable so that it is tightly shielded with simple manufacture even at very high frequencies.
  • This cable can be produced in a simple manner using machines which are customary in cable technology.
  • the two shield foils and the jacket can be molded around the cable core in one operation.
  • the cable then has a two-layer shield, the two layers of which, apart from the very narrow gaps at the overlap points, are each individually tubular. Both layers are therefore already suitable as umbrellas.
  • the offset of the overlap points of both shielding foils in the circumferential direction results overall in an effective shielding of the cable core even at very high frequencies, since the narrow gap remaining in the two layers of the shield in the respective overlap point is covered by the respective other layer.
  • the metallic strips used for the shielding foils can be made very thin so that the cable remains bendable.
  • the two shielding foils not only protect the cable core from an electromagnetic point of view, they are also an effective diffusion barrier for moisture.
  • an insulating intermediate layer is applied between the two screen films.
  • a screen constructed in this way has a low screen attenuation or a high coupling resistance, in particular at very high frequencies. If the two shielding films are firmly connected to one another via the intermediate layer, the result is a kind of sandwich construction, which prevents the screen from kinking when the cable is bent, for example, when it is wound on a spool.
  • the electrical communication cable K shown in cross section in FIG. 1 - hereinafter referred to as "cable K" - has four transmission elements 1, each of which is designed as a wire with an insulated metallic conductor.
  • the conductors are preferably made of copper.
  • a metallic screen 2 is attached over the cable core S formed by the transmission elements 1. It consists of copper or aluminum, for example. Its more precise structure is shown in FIG. 2.
  • the screen 2 is surrounded by a jacket 3 made of insulating material, which consists for example of polyethylene or polyvinyl chloride.
  • the screen 2 has two screen films 4 and 5, between which an insulating intermediate layer 6 is shown, dotted.
  • Both shielding foils 4 and 5 consist of metallic strips which have been formed lengthwise around the cable core S. They have overlap points 7 and 8 which run in the longitudinal direction of the cable K and are offset in relation to one another in the circumferential direction.
  • the overlap points 7 and 8 lie diametrically opposite one another. They are then offset from each other by 180 °.
  • the two screen films 4 and 5 can be firmly connected to one another in the finished screen 2 by the intermediate layer 6.
  • Bare aluminum or copper strips can be used as strips for the shielding foils 4 and 5.
  • the tapes can be between 25 ⁇ m and 150 ⁇ m thick. Tapes coated with a plastic can also be used on one side. The coated sides of such tapes can face each other in the finished cable or in the screen 2.
  • the bands can also be arranged so that only one layer lies between them, while the other layer is then arranged outside. The coating or coatings then form or form the intermediate layer 6.
  • Two strips, of which only one is coated with plastic can also be used for the screen foils 4 and 5. In the overlap points 7 and 8 of uncoated strips, bare metal lies against one another.
  • the intermediate layer 6 can also consist of a plastic film attached between the two screen films 4 and 5.
  • the plastic of the intermediate layer 6 can be designed as an adhesion promoter.
  • a copolymer of ethylene is suitable for this, for example. It becomes effective through the application of heat. The heat required for this is generated, for example, when the jacket 3 is applied.
  • a plastic film can be wrapped around the screen films 5. This is particularly advantageous if the two screen foils 4 and 5 are not firmly connected to one another.
  • a metallic drain wire can be assigned to each of the two shield foils 4 and 5, which runs over the entire length of the cable K and lies against the respective shield foil.
  • a drain wire can be, for example, a tinned copper wire.
  • the cable K according to FIG. 1 is produced according to FIG. 3, for example as follows:
  • a first metallic band 11 coming from a coil 10 is formed into the shielding film 4 with the overlap point 7 in a shaping device 9.
  • the cable core S and all layers applied to the same are moved in the direction of arrow P by the system according to FIG. 3.
  • the first band 11 is coated on one side with an adhesion promoter. This layer lies on the outside of the shielding film 4.
  • a second metallic band 13 is formed around the shielding film 4 in a shaping device 12 to form the shielding film 5 with the overlap point 8, which is pulled off from a coil 14.
  • the tape 13 is also coated on one side with an adhesion promoter. This layer lies inside the shielding film 5.
  • the sheath 3 is then applied to the screen 2 of the cable K thus formed from the two bands 11 and 13 by means of an extruder 15. The heat generated thereby activates the adhesion promoter of the two bands 11 and 13, so that the two screen foils 4 and 5 are firmly connected to one another.
  • the finished cable K can then be wound up on a spool.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Manufacturing Of Electric Cables (AREA)
EP96104781A 1995-08-19 1996-03-26 Câble électrique de télécommunication Withdrawn EP0759624A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19530576 1995-08-19
DE19530576 1995-08-19

Publications (1)

Publication Number Publication Date
EP0759624A1 true EP0759624A1 (fr) 1997-02-26

Family

ID=7769913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96104781A Withdrawn EP0759624A1 (fr) 1995-08-19 1996-03-26 Câble électrique de télécommunication

Country Status (3)

Country Link
EP (1) EP0759624A1 (fr)
JP (1) JPH09129040A (fr)
KR (1) KR970012800A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0867891A1 (fr) * 1997-03-27 1998-09-30 Alcatel Câble pour la transmission de données et son procédé de fabrication
CN110931178A (zh) * 2019-12-09 2020-03-27 芜湖航天特种电缆厂股份有限公司 用于电缆的绕包设备

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2774183B1 (fr) * 1998-01-26 2002-04-26 Alsthom Cge Alkatel Cable a tube sensiblement etanche logeant au moins un conducteur optique et un produit absorbant l'hydrogene
JPH11297132A (ja) * 1998-04-06 1999-10-29 Sumitomo Electric Ind Ltd 同軸ケーブルとそれを使った多心ケーブル

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1153152A (en) * 1965-09-13 1969-05-29 Gen Cable Corp Telephone Cable Sheath
US4510346A (en) * 1983-09-30 1985-04-09 At&T Bell Laboratories Shielded cable
GB2161016A (en) * 1984-06-29 1986-01-02 American Telephone & Telegraph Bonded sheath cable and methods of and apparatus for making
US5132491A (en) * 1991-03-15 1992-07-21 W. L. Gore & Associates, Inc. Shielded jacketed coaxial cable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1153152A (en) * 1965-09-13 1969-05-29 Gen Cable Corp Telephone Cable Sheath
US4510346A (en) * 1983-09-30 1985-04-09 At&T Bell Laboratories Shielded cable
GB2161016A (en) * 1984-06-29 1986-01-02 American Telephone & Telegraph Bonded sheath cable and methods of and apparatus for making
US5132491A (en) * 1991-03-15 1992-07-21 W. L. Gore & Associates, Inc. Shielded jacketed coaxial cable

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0867891A1 (fr) * 1997-03-27 1998-09-30 Alcatel Câble pour la transmission de données et son procédé de fabrication
FR2761515A1 (fr) * 1997-03-27 1998-10-02 Alsthom Cge Alcatel Cable pour la transmission de donnees et son procede de fabrication
US6259019B1 (en) 1997-03-27 2001-07-10 Alcatel Cable for transmitting data and method of manufacturing it
CN110931178A (zh) * 2019-12-09 2020-03-27 芜湖航天特种电缆厂股份有限公司 用于电缆的绕包设备

Also Published As

Publication number Publication date
JPH09129040A (ja) 1997-05-16
KR970012800A (ko) 1997-03-29

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