EP0692797A1 - Telecommunication cable - Google Patents

Telecommunication cable Download PDF

Info

Publication number
EP0692797A1
EP0692797A1 EP95810450A EP95810450A EP0692797A1 EP 0692797 A1 EP0692797 A1 EP 0692797A1 EP 95810450 A EP95810450 A EP 95810450A EP 95810450 A EP95810450 A EP 95810450A EP 0692797 A1 EP0692797 A1 EP 0692797A1
Authority
EP
European Patent Office
Prior art keywords
cable according
metal
screen
cable
metallic
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Withdrawn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
EP95810450A
Other languages
German (de)
French (fr)
Inventor
David Fiorucci
José Mettraux
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.)
CABLES CORTAILLOD SA
Original Assignee
CABLES CORTAILLOD SA
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 CABLES CORTAILLOD SA filed Critical CABLES CORTAILLOD SA
Publication of EP0692797A1 publication Critical patent/EP0692797A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • H01B11/18—Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
    • H01B11/1808—Construction of the conductors

Definitions

  • the present invention relates to a telecommunications cable comprising a central core consisting of at least one insulated conductor surrounded by a metallic structure, itself surrounded by a screen for protection against electromagnetic interference and a peripheral insulating sheath.
  • Known cables of this type usually have a metal braid applied over the central core to form a barrier to electromagnetic interference.
  • This technique has several drawbacks.
  • the market is currently evolving more and more towards fields of application using high frequencies and increasingly large ranges. Therefore, improving the high frequency tightness becomes a necessity which cannot be satisfied by the use of braids which have holes giving rise to leaks.
  • the establishment of a braid is slow and expensive. Indeed, this operation requires a special installation and can only be carried out separately from the manufacture of the central core of the cable, which contributes to very significantly increasing the production cost of telecommunications cables.
  • the cables currently manufactured such as those described in particular in patents US-A-5,208,426, US-A-5,037,999 and US-A-5,216,204, comprise several metallic or semiconductor layers which require complex technical means for their installation during the manufacture of the cable.
  • the present invention proposes to overcome these various drawbacks by providing a telecommunications cable with improved high frequency sealing, easy to manufacture on the same production equipment.
  • said screen comprises at least one layer of an intrinsic conductive material, applied by extrusion to said metal strip.
  • said screen may further comprise a metallic strip surrounding said core.
  • said metal strip is arranged longitudinally.
  • said metal strip is wound helically.
  • the edges of said metal strip overlap so as to form a sealed tube surrounding said core.
  • said metal strip can be made of a metal chosen from copper, aluminum, silver or an alloy comprising at least one of these metals and be of the multilayer type.
  • all the layers can be made of a metal chosen from copper, aluminum, silver or an alloy comprising at least one of these metals or at least one of the layers can be metallic and a at least layers can be made of a synthetic material.
  • the layer of intrinsic conductive material and the insulating sheath are applied simultaneously by extrusion.
  • the telecommunications cable 10 shown comprises a central core 11 consisting, in this case, of a single conductor 12 surrounded by a thick coaxial layer 13 of an insulating material.
  • This core could of course consist of several insulated conductors grouped for example in pairs or in quads as they are used for telephone connections.
  • This central core 11 is surrounded by a screen 14 for protection against electromagnetic interference.
  • This screen consists, in this case, of a metal strip 15 and a layer 16 of an intrinsic conductive material.
  • An insulating sheath 17 is applied coaxially to the underlying inner layers.
  • the metal strip 15 is preferably made of copper, aluminum, silver or an alloy comprising at least one of these metals. It can also be of the multilayer type and comprise several superimposed metal layers, possibly offset laterally with respect to each other, these different layers being made up of the metals or alloys mentioned above. Finally, it can be produced by a combination of metal and synthetic material, such as for example one or more layers of metal associated with one or more layers of polypropylene, polyester, etc. An advantageous embodiment consists in using a metal-synthetic-metal sandwich.
  • This ribbon can be arranged longitudinally or wound helically.
  • the edges can be adjacent or partially superimposed, so as to form a sealed tube.
  • Layer 16 consists of a material composed of a polymer or a mixture of polymers, at least one of which is intrinsically conductive, these polymers comprising, for example, polyethylene, polyvinyl chloride, polyaniline, polypyrrole, polyacetylene, etc. In all these cases, this layer is obtained by extrusion directly on the metal strip 15.
  • the insulating sheath 17 is advantageously made of synthetic material by extrusion.
  • the material usually chosen is polyvinyl chloride, polyethylene, etc.
  • the layers 16 and 17 can be extruded in the same operation, almost simultaneously, using a so-called "tandem" extrusion technique.
  • the intrinsic conductive polymer can, where appropriate, be replaced by a partially conductive thermoplastic material, in particular a thermoplastic material loaded with metallic particles.

Abstract

The telecommunications cable (10) has a central core (11), comprising an insulated conductor. This is surrounded by a protective screen (14) against electromagnetic interference, made up of a bed of an intrinsic conducting material (16), extruded over a metallic ribbon (15). The cable is finished by a peripheral insulating sheath (17). The screen bed and final sheath may be applied by simultaneous extrusion. The cable conductor (12) may be covered by a coaxial bed of insulation (13). The screening metal ribbon may be longitudinal, or helically wound, of copper, aluminium, silver or an alloy of these. The screen ribbon may be covered, forming a watertight tube around the core. The ribbon may be multi-bedded, with all metal beds, or one of metal and another of synthetic material. <IMAGE>

Description

La présente invention concerne un câble de télécommunications comportant un noyau central constitué d'au moins un conducteur isolé entouré d'une structure métallique, elle-même entourée d'un écran de protection contre les interférences électromagnétiques et d'une gaine isolante périphérique.The present invention relates to a telecommunications cable comprising a central core consisting of at least one insulated conductor surrounded by a metallic structure, itself surrounded by a screen for protection against electromagnetic interference and a peripheral insulating sheath.

Les câbles connus de ce type comportent habituellement une tresse métallique appliquée par-dessus le noyau central pour constituer une barrières aux interférences électromagnétiques. Cette technique présente plusieurs inconvénients. Tout d'abord, l'efficacité de ces tresses est médiocre, notamment dans le domaine des fréquences élevées. Or, le marché évolue actuellement de plus en plus vers des domaines d'application utilisant des fréquences élevées et des plages de plus en plus grandes. De ce fait, l'amélioration de l'étanchéité haute fréquence devient une nécessité qui ne peut pas être satisfaite par l'utilisation de tresses qui comportent des trous donnant lieu à des fuites. De plus, la mise en place d'une tresse est lente et coûteuse. En effet, cette opération nécessite une installation particulière et ne peut être réalisée que séparément de la fabrication du noyau central du câble, ce qui contribue à augmenter de façon très sensible le coût de production des câbles de télécommunications.Known cables of this type usually have a metal braid applied over the central core to form a barrier to electromagnetic interference. This technique has several drawbacks. First, the effectiveness of these braids is poor, especially in the area of high frequencies. However, the market is currently evolving more and more towards fields of application using high frequencies and increasingly large ranges. Therefore, improving the high frequency tightness becomes a necessity which cannot be satisfied by the use of braids which have holes giving rise to leaks. In addition, the establishment of a braid is slow and expensive. Indeed, this operation requires a special installation and can only be carried out separately from the manufacture of the central core of the cable, which contributes to very significantly increasing the production cost of telecommunications cables.

D'autre part les câbles actuellement fabriqués, tels que ceux décrits notamment dans les brevets US-A-5 208 426, US-A-5 037 999 et US-A- 5 216 204, comportent plusieurs couches métalliques ou semiconductrices qui nécessitent des moyens techniques complexes pour leur mise en place lors de la fabrication du câble.On the other hand the cables currently manufactured, such as those described in particular in patents US-A-5,208,426, US-A-5,037,999 and US-A-5,216,204, comprise several metallic or semiconductor layers which require complex technical means for their installation during the manufacture of the cable.

La présente invention se propose de pallier ces divers inconvénients en réalisant un câble de télécommunications à étanchéité haute fréquence améliorée, facile à fabriquer sur un même équipement de production.The present invention proposes to overcome these various drawbacks by providing a telecommunications cable with improved high frequency sealing, easy to manufacture on the same production equipment.

Ce but est atteint par le câble selon l'invention, caractérisé en ce que ledit écran comporte au moins une couche d'un matériau conducteur intrinsèque, appliquée par extrusion sur ledit ruban métallique.This object is achieved by the cable according to the invention, characterized in that said screen comprises at least one layer of an intrinsic conductive material, applied by extrusion to said metal strip.

Selon un mode de réalisation préféré, dans l'état actuel du savoir-faire industriel en matière de fabrication de polymère intrinsèquement conducteur, ledit écran peut comporter en outre un ruban métallique entourant ledit noyau.According to a preferred embodiment, in the current state of industrial know-how in the manufacture of intrinsically conductive polymer, said screen may further comprise a metallic strip surrounding said core.

Dans une première forme de réalisation, ledit ruban métallique est disposé longitudinalement.In a first embodiment, said metal strip is arranged longitudinally.

Dans une deuxième forme de réalisation, ledit ruban métallique est enroulé hélicoidalement.In a second embodiment, said metal strip is wound helically.

Dans toutes les formes de réalisation, les bords dudit ruban métallique se recouvrent de manière à former un tube étanche entourant ledit noyau.In all the embodiments, the edges of said metal strip overlap so as to form a sealed tube surrounding said core.

De façon avantageuse, ledit ruban métallique peut être réalisé en un métal choisi parmi le cuivre, l'aluminium, l'argent ou un alliage comportant au moins un de ces métaux et être du type multicouche.Advantageously, said metal strip can be made of a metal chosen from copper, aluminum, silver or an alloy comprising at least one of these metals and be of the multilayer type.

Lorsque le ruban est du type multicouche, toutes les couches peuvent être réalisées en un métal choisi parmi le cuivre, l'aluminium, l'argent ou un alliage comportant au moins un de ces métaux ou une au moins des couches peut être métallique et une au moins des couches peut être réalisée en un matériau synthétique.When the ribbon is of the multilayer type, all the layers can be made of a metal chosen from copper, aluminum, silver or an alloy comprising at least one of these metals or at least one of the layers can be metallic and a at least layers can be made of a synthetic material.

Dans toutes les formes de réalisation, la couche de matériau conducteur intrinsèque et la gaine isolante sont appliquées simultanément par extrusion.In all embodiments, the layer of intrinsic conductive material and the insulating sheath are applied simultaneously by extrusion.

La présente invention sera mieux comprise en référence à la description d'un mode de réalisation préféré donné à titre d'exemple non limitatif et aux dessins annexés dans lesquels :

  • la figure 1 représente une vue en perspective partiellement coupée d'un segment de câble selon l'invention, et
  • la figure 2 représente une vue en coupe transversale du câble de la figure 1.
The present invention will be better understood with reference to the description of a preferred embodiment given by way of nonlimiting example and to the accompanying drawings in which:
  • FIG. 1 represents a partially cut perspective view of a cable segment according to the invention, and
  • FIG. 2 represents a cross-sectional view of the cable of FIG. 1.

En référence aux figures, le câble de télécommunications 10 représenté comporte un noyau central 11 constitué, dans ce cas, d'un conducteur unique 12 entouré d'une couche coaxiale épaisse 13 d'un matériau isolant. Ce noyau pourrait bien entendu être constitué de plusieurs conducteurs isolés groupés par exemple en paires ou en quartes telles qu'elles sont utilisées pour les liaisons téléphoniques.With reference to the figures, the telecommunications cable 10 shown comprises a central core 11 consisting, in this case, of a single conductor 12 surrounded by a thick coaxial layer 13 of an insulating material. This core could of course consist of several insulated conductors grouped for example in pairs or in quads as they are used for telephone connections.

Ce noyau central 11 est entouré d'un écran 14 de protection contre les interférences électromagnétiques. Cet écran se compose, dans le cas présent, d'un ruban métallique 15 et d'une couche 16 d'un matériau conducteur intrinsèque.This central core 11 is surrounded by a screen 14 for protection against electromagnetic interference. This screen consists, in this case, of a metal strip 15 and a layer 16 of an intrinsic conductive material.

Une gaine isolante 17 est appliquée coaxialement aux couches intérieures sous-jacentes.An insulating sheath 17 is applied coaxially to the underlying inner layers.

Le ruban métallique 15 est de préférence réalisé en cuivre, en aluminium, en argent ou en un alliage comportant au moins l'un de ces métaux. Il peut également être du type multicouche et comporter plusieurs couches métalliques superposées, éventuellement décalées latéralement l'une par rapport aux autres, ces différentes couches étant constituées des métaux ou des alliages mentionnés ci-dessus. Il peut enfin être réalisé par une combinaison de métal et de matière synthétique, telle que par exemple une ou plusieurs couches de métal associées à une ou plusieurs couches de polypropylène, polyester, etc. Une réalisation avantageuse consiste à utiliser un sandwich métal-matière synthétique-métal.The metal strip 15 is preferably made of copper, aluminum, silver or an alloy comprising at least one of these metals. It can also be of the multilayer type and comprise several superimposed metal layers, possibly offset laterally with respect to each other, these different layers being made up of the metals or alloys mentioned above. Finally, it can be produced by a combination of metal and synthetic material, such as for example one or more layers of metal associated with one or more layers of polypropylene, polyester, etc. An advantageous embodiment consists in using a metal-synthetic-metal sandwich.

Ce ruban peut être disposé longitudinalement ou enroulé hélicoidalement. Les bords peuvent être adjacents ou partiellement superposés, de manière à former un tube étanche. En outre, on peut envisager une superposition de deux ou plusieurs couches pour renforcer l'effet "tube".This ribbon can be arranged longitudinally or wound helically. The edges can be adjacent or partially superimposed, so as to form a sealed tube. In addition, we can consider a superposition of two or more layers to enhance the "tube" effect.

La couche 16 est constituée d'un matériau composé d'un polymère ou d'un mélange de polymères dont l'un au moins est intrinsèquement conducteur, ces polymères comprenant par exemple le polyéthylène, le chlorure de polyvinyle, la polyaniline, le polypyrrole, du polyacétylène, etc.. Dans tous ces cas, cette couche est obtenue par extrusion directement sur le ruban métallique 15.Layer 16 consists of a material composed of a polymer or a mixture of polymers, at least one of which is intrinsically conductive, these polymers comprising, for example, polyethylene, polyvinyl chloride, polyaniline, polypyrrole, polyacetylene, etc. In all these cases, this layer is obtained by extrusion directly on the metal strip 15.

La gaine isolante 17 est avantageusement réalisée en matière synthétique par extrusion. Le matériau habituellement choisi est le chlorure de polyvinyle, le polyéthylène etc.. L'extrusion des couches 16 et 17 peut se faire au cours d'une même opération, quasi simultanément selon une technique d'extrusion dite "en tandem".The insulating sheath 17 is advantageously made of synthetic material by extrusion. The material usually chosen is polyvinyl chloride, polyethylene, etc. The layers 16 and 17 can be extruded in the same operation, almost simultaneously, using a so-called "tandem" extrusion technique.

Dans l'état actuel des connaissances en matière de réalisation des polymères conducteurs intrinsèques, il est quasiment nécessaire de prévoir le ruban métallique entourant le noyau central. Toutefois, des essais en cours dans des laboratoires démontrent que l'on pourra produire de manière industrielle et dans un proche avenir des polymères conducteurs intrinsèques qui possèdent une conductivité suffisante pour assurer la fonction du ruban métallique, ce dernier pouvant alors être supprimé. C'est pourquoi la présence de ce ruban métallique présente un caractère facultatif.In the current state of knowledge in the production of intrinsic conductive polymers, it is almost necessary to provide the metal strip surrounding the central core. However, tests in progress in laboratories demonstrate that it will be possible to produce, industrially and in the near future, intrinsic conductive polymers which have sufficient conductivity to ensure the function of the metallic strip, the latter then being able to be eliminated. This is why the presence of this metallic ribbon is optional.

Le polymère conducteur intrinsèque peut, le cas échéant, être remplacé par un matériau thermoplastique partiellement conducteur, notamment un matériau thermoplastique chargé en particules métalliques.The intrinsic conductive polymer can, where appropriate, be replaced by a partially conductive thermoplastic material, in particular a thermoplastic material loaded with metallic particles.

Claims (10)

Câble de télécommunications comportant un noyau central constitué d'au moins un conducteur isolé entouré d'une structure métallique, elle-même entourée d'un écran de protection contre les interférences électromagnétiques et d'une gaine isolante périphérique, caractérisé en ce que ledit écran (14) comporte au moins une couche (16) d'un matériau conducteur intrinsèque, appliquée par extrusion sur ledit ruban métallique.Telecommunications cable comprising a central core consisting of at least one insulated conductor surrounded by a metallic structure, itself surrounded by a screen for protection against electromagnetic interference and a peripheral insulating sheath, characterized in that said screen (14) comprises at least one layer (16) of an intrinsic conductive material, applied by extrusion on said metal strip. Câble selon la revendication 1, caractérisé en ce que ledit écran (14) comporte en outre un ruban métallique (15) entourant ledit noyau (11).Cable according to claim 1, characterized in that said screen (14) further comprises a metallic strip (15) surrounding said core (11). Câble selon la revendication 2, caractérisé en ce que ledit ruban métallique (15) est disposé longitudinalement.Cable according to claim 2, characterized in that said metal strip (15) is arranged longitudinally. Câble selon la revendication 2, caractérisé en ce que ledit ruban métallique (15) est enroulé hélicoidalement.Cable according to claim 2, characterized in that said metallic strip (15) is wound helically. Câble selon la revendication 3 ou 4, caractérisé en ce que les bords dudit ruban métallique (15) se recouvrent de manière à former un tube étanche entourant ledit noyau (11).Cable according to claim 3 or 4, characterized in that the edges of said metal strip (15) overlap so as to form a sealed tube surrounding said core (11). Câble selon la revendication 2, caractérisé en ce que ledit ruban métallique (15) est réalisé en un métal choisi parmi le cuivre, l'aluminium, l'argent ou un alliage comportant au moins un de ces métaux.Cable according to claim 2, characterized in that said metal strip (15) is made of a metal chosen from copper, aluminum, silver or an alloy comprising at least one of these metals. Câble selon la revendication 2, caractérisé en ce que ledit ruban métallique est du type multicouche.Cable according to claim 2, characterized in that said metallic strip is of the multilayer type. Câble selon la revendication 7, caractérisé en ce que toutes les couches sont réalisées en un métal choisi parmi le cuivre, l'aluminium, l'argent ou un alliage comportant au moins un de ces métaux.Cable according to claim 7, characterized in that all the layers are made of a metal chosen from copper, aluminum, silver or an alloy comprising at least one of these metals. Câble selon la revendication 7, caractérisé en ce qu'une au moins des couches est métallique et une au moins des couches est réalisée en un matériau synthétique.Cable according to claim 7, characterized in that at least one of the layers is metallic and at least one of the layers is made of a synthetic material. Câble selon la revendication 1, caractérisé en ce que la couche (16) de matériau conducteur intrinsèque et la gaine isolante (17) sont appliquées simultanément par extrusion.Cable according to claim 1, characterized in that the layer (16) of intrinsic conductive material and the insulating sheath (17) are applied simultaneously by extrusion.
EP95810450A 1994-07-11 1995-07-07 Telecommunication cable Withdrawn EP0692797A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9408784A FR2722329B1 (en) 1994-07-11 1994-07-11 TELECOMMUNICATIONS CABLES
FR9408784 1994-07-11

Publications (1)

Publication Number Publication Date
EP0692797A1 true EP0692797A1 (en) 1996-01-17

Family

ID=9465421

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95810450A Withdrawn EP0692797A1 (en) 1994-07-11 1995-07-07 Telecommunication cable

Country Status (2)

Country Link
EP (1) EP0692797A1 (en)
FR (1) FR2722329B1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5037999A (en) 1990-03-08 1991-08-06 W. L. Gore & Associates Conductively-jacketed coaxial cable
US5208426A (en) 1991-09-03 1993-05-04 W. L. Gore & Associates, Inc. Shielded electric signal cable having a two-layer semiconductor jacket
US5216204A (en) 1991-08-02 1993-06-01 International Business Machines Corp. Static dissipative electrical cable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5037999A (en) 1990-03-08 1991-08-06 W. L. Gore & Associates Conductively-jacketed coaxial cable
US5216204A (en) 1991-08-02 1993-06-01 International Business Machines Corp. Static dissipative electrical cable
US5208426A (en) 1991-09-03 1993-05-04 W. L. Gore & Associates, Inc. Shielded electric signal cable having a two-layer semiconductor jacket

Also Published As

Publication number Publication date
FR2722329A1 (en) 1996-01-12
FR2722329B1 (en) 1996-09-06

Similar Documents

Publication Publication Date Title
US5043538A (en) Water resistant cable construction
US20210217542A1 (en) Electrical cable with electrically conductive coating
EP0867891B1 (en) Data transmission cable and its manufacturing process
CA2088215C (en) High frequency electric cable
US4453031A (en) Multi-compartment screened telephone cables
EP0643399B1 (en) High frequency transmission cable
EP0777926A1 (en) Junction of power cables
FR2522438A1 (en) ELECTRIC CABLE FOR USE IN OIL WELLS
CA1250626A (en) Liquid cooled electric cable
JPH0945163A (en) Preparation of sector conductor for cable for electrical energy
EP0692797A1 (en) Telecommunication cable
CH621653A5 (en)
GB1592625A (en) Screen-protected and plastics-insulated power cable
JPH09213143A (en) Transmission line
WO1996004666A1 (en) Cable for conveying electrical energy or telecommunications and method for the manufacture of such a cable
US8138420B2 (en) Semi-bonded shielding in a coaxial cable
EP0707322A1 (en) Power cable
US20110132653A1 (en) Coaxial cable shielding
FR2748845A1 (en) ELECTRICAL CABLE FOR HIGH FREQUENCY TRANSMISSION
EP0093031A1 (en) Electrical cable with aluminium conductors
EP1009082B1 (en) Screen connection for mechanico retractable products
FR2709592A1 (en) Cable resistant to chemical attack
JPH0845363A (en) Coaxial cable
CH631568A5 (en) ELECTRIC CABLE.
FR3110279A1 (en) Method of modifying an electric cable for a vehicle

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE FR LI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19960718