EP0015816A1 - Method of manufacturing a coaxial cable - Google Patents

Method of manufacturing a coaxial cable Download PDF

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Publication number
EP0015816A1
EP0015816A1 EP80400256A EP80400256A EP0015816A1 EP 0015816 A1 EP0015816 A1 EP 0015816A1 EP 80400256 A EP80400256 A EP 80400256A EP 80400256 A EP80400256 A EP 80400256A EP 0015816 A1 EP0015816 A1 EP 0015816A1
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EP
European Patent Office
Prior art keywords
tape
dielectric
central conductor
dielectric tape
ribbon
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.)
Granted
Application number
EP80400256A
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German (de)
French (fr)
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EP0015816B1 (en
Inventor
Claude Gallachi
Jacques Personne
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Lignes Telegraphiques et Telephoniques LTT SA
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Lignes Telegraphiques et Telephoniques LTT SA
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    • 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
    • H01B13/016—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables
    • 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
    • H01B11/1008—Features relating to screening tape per se
    • 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
    • H01B13/2686—Pretreatment

Definitions

  • the present invention relates to a method of manufacturing small coaxial pairs intended more particularly for transmission systems which do not require rigorous shielding of the pair, that is to say, in particular, for digital transmission systems. It is, in fact, known that the specifications of such systems can be fulfilled using pairs in which the external conductor alone acts as a screen.
  • the present invention is particularly motivated by the reduction in the cost of production by using cheaper constituent materials and: reduction in the cost of labor.
  • the problem of economical manufacture of small coaxial pairs has been the subject of numerous studies, one of which was published on page 243 of the July 1971 issue of the review "Cables and Transmission”.
  • the article entitled "1.2 / 4.4 mm coaxial pair for digital transmission” describes a structure with four coaxial pairs assembled like the conductors of a quarter, the external conductors of which consist of smooth ribbons formed into an overlapping cylinder around the insulation surrounding the central conductor, during the assembly operation.
  • the outer conductors are kept cylindrical and the mechanical rigidity of all four pairs is ensured by the forces applied by the pairs after assembly. It is therefore not possible to obtain by this process unit pairs with final dimensions.
  • the present invention is essentially characterized in that the outer conductor of the pair is a complex ribbon, subsequently formed into a cylinder around the central conductor carrying an insulation, consisting essentially of a metallic ribbon, the width of which is close to the circumference of the circle circumscribed to said isolation of the central conductor, made integral over its entire surface with a dielectric tape of width greater than its own.
  • the dielectric part of the complex tape constitutes a lap joint and the dielectric tape allows the longitudinal sealing of the outer conductor over the entire width of the lap. , for example after heating, which ensures the cylindrical shape of the complex strip is maintained and the impedance remains constant along the pair without external action.
  • the dielectric outer tape mechanically protects the outer conductor.
  • the two elements of the complex ribbon are made integral by heating and pressing through rollers, as is well known.
  • the dielectric tape carries a layer of ethylene copolymer on one side, which facilitates longitudinal sealing without this characteristic being limiting.
  • the metallic tape can also be coated on its face applied against the dielectric tape so as to promote the adhesion of the two tapes.
  • the dielectric tape has a coating of copolymer on each of its faces in order to promote sealing overlay.
  • the dielectric tape used is paper and the metal tape, copper 0.10 mm thick, the width of the dielectric tape being greater than that of the metal by at least 10% with a minimum of 3 mm.
  • FIG. 1 represents the continuation of the manufacturing operations of the preferred variant of coaxial pair according to the invention.
  • Operation 1 is the realization by means known in themselves of the insulation of the central copper conductor, for example by continuous molding of calibrated polyethylene discs of diameter d corresponding to the nominal characteristic impedance of the coaxial pair , taking into account the permittivity of the dielectric employed.
  • Operation 3 is the production of the complex ribbon which will be used to produce the outer envelope of a coaxial pair and whose description is given below.
  • Operation 4 is the shaping of the complex ribbon around the insulated central conductor in order to produce the coaxial pair according to the invention and the sealing of the ribbon.
  • FIG. 2A represents one of the ends of a complex ribbon allowing the implementation of the method according to the invention.
  • This complex ribbon comprises a thin copper strip 8, for example of thickness equal to 0.1 millimeter, the width 1 of which is equal to nd + b where d is the outside diameter of the central conductor fitted with the discs and the insulation tape and b is small in front of ⁇ d and corresponds to the desired overlap (see Figure 3A) for the metal.
  • the copper strip 8 rests on its entire underside on a dielectric strip 5, for example made of kraft paper.
  • the dielectric is a plastic material and the adhesion between the metallic strip and the dielectric strip is obtained without the interposition of adhesion agent by calendering for example.
  • the two ribbons are laterally offset (a, c) in order to avoid the superposition of the overlap zones (FIG. 3A).
  • FIG. 28 represents a variant of the complex ribbon corresponding to an edge-to-edge laying of the metal part 8 and overlapping of the dielectric part 5.
  • l ⁇ d
  • FIGS. 3 represent sections of two variants of coaxial pair produced by the method according to the invention.
  • the central core of this pair consists of a copper conductor 30 on which the dielectric disc 31 is molded.
  • a dielectric strip 32 is placed overlapping on said disc 31. It is understood that this strip is not essential to the making of the pair.
  • the capacitor exterior is constituted by the metallic ribbon 8 of the complex ribbon 8 - 5: It is laid overlapping in the variant of FIG. 3A and edge to edge in the variant of FIG. 3 8 .
  • FIG. 4 schematically represents the production line of a coaxial pair according to FIG. 3A.
  • a reel 15 supplies the installation with the metal strip 8, for example made of copper, necessary for producing the complex ribbon at the running speed of the central conductor 30 at the outlet of the molding station 11.
  • a reel 17 supplies the installation with kraft paper 5 previously coated on the face coming into contact with the metal strip.
  • Two rollers 19 and 20 having a suitable speed of rotation ensure the adhesion of the metal strip 8 and of the paper 5 constituting the complex ribbon 21.
  • the former 22 surrounds the core of the coaxial pair of the complex ribbon 21.
  • a heating die 26 seals the composite tape.
  • a pulling member 24 associated with the drum 25 constitutes the reception of the completed pair. We did not specify the enslavements between the various positions of the manufacturing line.
  • the applicant also produces a second type of coaxial pair differing from the previous one only in the nature of the external insulation which is a polyester, for example that sold under the name of mylar by Dupont de Nemours.
  • the copper strip can be replaced by an aluminum strip of similar thickness and of the same width or a bimetallic strip known per se.

Abstract

1. Method of producing a coaxial cable composed of a central conductor (30) associated with insulation means (31) assuring the spacing from an outer conductor, characterized in that the application of the latter comprises a first step wherein a composite tape is disposed in longitudinal direction about said insulation means (31), said composite tape being composed of a metallic ribbon (8) having a width at least equal to the periphery of the insulation means (31) and joined with a first dielectric tape (5) of larger width, and a second step wherein the mutually overlapping edges of the dielectric tape (5) are joined with each other using a heating draw-head (26), the composite tape being thus cylindrically shaped about said insulation means (31) carried by the central conductor (30).

Description

La présente invention concerne un procédé de fabrication de paires coaxiales de petite dimension destinées plus particulièrement aux systèmes de transmission n'exigeant pas de blindage rigoureux de la paire, c'est-à-dire, en particulier, aux systèmes de transmission numérique. Il est, en effet, connu que les spécifications de tels systèmes peuvent être remplies à l'aide de paires dont le conducteur extérieur joue seul le rôle d'écran.The present invention relates to a method of manufacturing small coaxial pairs intended more particularly for transmission systems which do not require rigorous shielding of the pair, that is to say, in particular, for digital transmission systems. It is, in fact, known that the specifications of such systems can be fulfilled using pairs in which the external conductor alone acts as a screen.

La présente invention est particulièrement motivée par la réduction du coût de production par utilisation de matériaux constituants moins chers et : diminution du coût de main-d'oeuvre. Le problème de la fabrication économique de petites paires coaxiales a fait l'objet de nombreuses études dont l'une a été publiée page 243 du numéro de Juillet 1971 de la revue "Câbles et Transmission". L'article intitulé "Paire Coaxiale de 1,2/4,4 mm pour transmission numérique" décrit une structure à quatre paires coaxiales assemblées comme les conducteurs d'une quarte, dont les conducteurs extérieurs sont constitués de rubans lisses formés en cylindre à recouvrement autour de l'isolant entourant le conducteur central, au cours de l'opération d'assemblage. Les conducteurs extérieurs sont maintenus cylindriques et la rigidité mécanique de l'ensemble des quatre paires est assurée grâce aux efforts appliqués par les paires après assemblage. Il n'est donc pas possible d'obtenir par ce procédé des paires unitaires aux dimensions définitives.The present invention is particularly motivated by the reduction in the cost of production by using cheaper constituent materials and: reduction in the cost of labor. The problem of economical manufacture of small coaxial pairs has been the subject of numerous studies, one of which was published on page 243 of the July 1971 issue of the review "Cables and Transmission". The article entitled "1.2 / 4.4 mm coaxial pair for digital transmission" describes a structure with four coaxial pairs assembled like the conductors of a quarter, the external conductors of which consist of smooth ribbons formed into an overlapping cylinder around the insulation surrounding the central conductor, during the assembly operation. The outer conductors are kept cylindrical and the mechanical rigidity of all four pairs is ensured by the forces applied by the pairs after assembly. It is therefore not possible to obtain by this process unit pairs with final dimensions.

On a également proposé de fabriquer des paires coaxiales en soudant les bords en regard du conducteur extérieur. Une telle solution conduit à des coûts de production élevés par suite des soins et investissements nécessaires à la mise en oeuvre de la soudure longitudinale.It has also been proposed to make pairs coaxial by soldering the facing edges of the outer conductor. Such a solution leads to high production costs as a result of the care and investment necessary for the implementation of longitudinal welding.

La présente invention est essentiellement caractérisée en ce que le conducteur extérieur de la paire est un ruban complexe, ultérieurement formé en cylindre autour du conducteur central portant un isolement, constitué essentiellement d'un ruban métallique, dont la largeur est voisine de la circonférence du cercle circonscrit audit isolement du conducteur central, rendu solidaire sur toute sa surface d'un ruban diélectrique de largeur supérieure à la sienne. Lors de la mise en forme du ruban complexe, métal à l'intérieur et diélectrique à l'extérieur, la partie diélectrique du ruban complexe constitue un joint à recouvrement et le ruban diélectrique permet le scellement longitudinal du conducteur extérieur sur toute la largeur du recouvrement, par exemple après chauffage, ce qui assure le maintien en forme cylindrique du ruban complexe et la constance de l'impédance le long de la paire sans action extérieure. De plus, le ruban extérieur diélectrique protège mécaniquement le conducteur extérieur. Les deux éléments du ruban complexe sont rendus solidaires par chauffage et pressage à travers des rouleaux, ainsi qu'il est bien connu. Selon la variante préférée, le ruban diélectrique porte une couche de copolymère d'éthylène sur une face, ce qui facilite le scellement longitudinal sans que cette caractéristique soit limitative. Le ruban métallique peut également être revêtu sur sa face appliquée contre le ruban diélectrique de façon à favoriser l'adhésion des deux rubans. Dans certaines réalisations le ruban diélectrique présente une enduction de copolymère sur chacune de ses faces en vue de favoriser le scellement au recouvrement.The present invention is essentially characterized in that the outer conductor of the pair is a complex ribbon, subsequently formed into a cylinder around the central conductor carrying an insulation, consisting essentially of a metallic ribbon, the width of which is close to the circumference of the circle circumscribed to said isolation of the central conductor, made integral over its entire surface with a dielectric tape of width greater than its own. When forming the complex tape, metal inside and dielectric outside, the dielectric part of the complex tape constitutes a lap joint and the dielectric tape allows the longitudinal sealing of the outer conductor over the entire width of the lap. , for example after heating, which ensures the cylindrical shape of the complex strip is maintained and the impedance remains constant along the pair without external action. In addition, the dielectric outer tape mechanically protects the outer conductor. The two elements of the complex ribbon are made integral by heating and pressing through rollers, as is well known. According to the preferred variant, the dielectric tape carries a layer of ethylene copolymer on one side, which facilitates longitudinal sealing without this characteristic being limiting. The metallic tape can also be coated on its face applied against the dielectric tape so as to promote the adhesion of the two tapes. In certain embodiments, the dielectric tape has a coating of copolymer on each of its faces in order to promote sealing overlay.

Selon la variante préférée, le ruban diélectrique utilisé est du papier et le ruban métallique, du cuivre de 0,10 mm d'épaisseur,,la largeur du ruban diélectrique étant supérieure à celle du métal d'au moins 10 % avec un minimum de 3 mm.According to the preferred variant, the dielectric tape used is paper and the metal tape, copper 0.10 mm thick, the width of the dielectric tape being greater than that of the metal by at least 10% with a minimum of 3 mm.

Le procédé selon l'invention présente les avantages suivants :

  • - il permet de fabriquer la paire coaxiale par mise en place longitudinale des éléments constitutifs à l'aide de machines opérant à grande vitesse (plusieurs dizaines de mètres par minute) et d'un fonctionnement simple dont l'automatisation peut être réalisée sans problème ;
  • - la paire coaxiale est mécaniquement stable et cylindrique et le contrôle de ses caractéristiques électriques peut être assuré ;
  • - elle peut être assemblée avec un nombre quelconque de paires identiques soit en faisceaux soit en couches concentriques ce qui est particulièrement favorable à la réalisation de câbles de grande capacité ;
  • - le conducteur externe peut être au choix en cuivre ou en aluminium ;
  • - l'augmentation de diamètre de la paire téléphonique isolée est négligeable par rapport à la valeur du diamètre d'une même paire nue.
The method according to the invention has the following advantages:
  • - It makes it possible to manufacture the coaxial pair by longitudinal positioning of the constituent elements using machines operating at high speed (several tens of meters per minute) and of simple operation, the automation of which can be carried out without problem;
  • - the coaxial pair is mechanically stable and cylindrical and control of its electrical characteristics can be ensured;
  • - It can be assembled with any number of identical pairs either in bundles or in concentric layers which is particularly favorable for the production of high capacity cables;
  • - the external conductor can be either copper or aluminum;
  • - the increase in diameter of the isolated telephone pair is negligible compared to the value of the diameter of the same bare pair.

Dans ce qui suit, le procédé selon l'invention est décrit en détail en se reportant notamment aux figures 1 à 4 données à titre illustratif, nullement limitatif, et dans lesquelles :

  • - la figure 1 représente la suite des opérations du procédé,
  • - la figure 2 représente le ruban complexe utilisé ,
  • - la figure 3 représente schématiquement la fabrication de la paire coaxiale par le procédé selon l'invention,
  • - la figure 4 représente la section agrandie de la paire coaxiale fabriquée par le procédé selon l'invention.
In what follows, the method according to the invention is described in detail with particular reference to FIGS. 1 to 4 given by way of illustration, in no way limiting, and in which:
  • FIG. 1 represents the rest of the process operations,
  • FIG. 2 represents the complex ribbon used,
  • FIG. 3 schematically represents the manufacture of the coaxial pair by the method according to the invention,
  • - Figure 4 shows the enlarged section of the coaxial pair manufactured by the method according to the invention.

La figure 1 représente la suite des opérations de fabrication de la variante préférée de paire coaxiale selon l'invenion.FIG. 1 represents the continuation of the manufacturing operations of the preferred variant of coaxial pair according to the invention.

L'opération 1 est la réalisation par des moyens connus en eux-mêmes de l'isolation du conducteur central en cuivre, par exemple par moulage en continu de disques calibrés de polyéthylène de diamètre d correspondant à l'impédance caractéristique nominale de la paire coaxiale, compte tenu de la permittivité du diélectrique employé.Operation 1 is the realization by means known in themselves of the insulation of the central copper conductor, for example by continuous molding of calibrated polyethylene discs of diameter d corresponding to the nominal characteristic impedance of the coaxial pair , taking into account the permittivity of the dielectric employed.

En vue d'éviter les courts-circuits qui pourraient résulter d'une déformation mécanique amenant le conducteur extérieur au contact du conducteur central, entre deux disques, il est prévu de poser en long (opération 2) un ruban diélectrique autour des disques.In order to avoid short-circuits which could result from a mechanical deformation bringing the external conductor into contact with the central conductor, between two discs, provision is made to lay lengthwise (operation 2) a dielectric tape around the discs.

L'opération 3 est la réalisation du ruban complexe qui va servir à réaliser l'enveloppe extérieure d'une paire coaxiale et dont description est donnée ci-dessous.Operation 3 is the production of the complex ribbon which will be used to produce the outer envelope of a coaxial pair and whose description is given below.

L'opération 4 est la mise en forme du ruban complexe autour du conducteur central isolé afin de réaliser la paire coaxiale selon l'invention et le scellement du ruban.Operation 4 is the shaping of the complex ribbon around the insulated central conductor in order to produce the coaxial pair according to the invention and the sealing of the ribbon.

La figure 2A représente une des extrémités d'un ruban complexe permettant la mise en oeuvre du procédé selon l'invention . Ce ruban complexe comporte une bande de cuivre mince 8, par exemple d'épaisseur égale à 0,1 millimètre, dont la largeur 1 est égale à nd + b où d est le diamètre extérieur du conducteur central muni des disques et du ruban d'isolement et b est petit devant πd et correspond au recouvrement désiré (cf figure 3A) pour le métal. La bande de cuivre 8 repose sur toute sa face inférieure sur une bande diélectrique 5, par exemple en papier kraft. La bande diélectrique 5 a une largeur L = πd + R avec R>b. Elle porte sur sa face supérieure un revêtement de copolymère d'éthylène 6 arbitrairement grossi pour les besoins de la représentation. Selon d'autres variantes le diélectrique est une matière plastique et l'adhérence entre le ruban métallique et le ruban diélectrique est obtenue sans interposition d'agent d'adhésion par calandrage par exemple. Ainsi qu'il apparait sur la figure 2A, les deux rubans sont latéralement décalés (a, c) afin d'éviter la superpostion des zones de recouvrement (figure 3A).FIG. 2A represents one of the ends of a complex ribbon allowing the implementation of the method according to the invention. This complex ribbon comprises a thin copper strip 8, for example of thickness equal to 0.1 millimeter, the width 1 of which is equal to nd + b where d is the outside diameter of the central conductor fitted with the discs and the insulation tape and b is small in front of πd and corresponds to the desired overlap (see Figure 3A) for the metal. The copper strip 8 rests on its entire underside on a dielectric strip 5, for example made of kraft paper. The dielectric strip 5 has a width L = πd + R with R> b. It has on its upper face a coating of ethylene 6 copolymer arbitrarily enlarged for the needs of representation. According to other variants, the dielectric is a plastic material and the adhesion between the metallic strip and the dielectric strip is obtained without the interposition of adhesion agent by calendering for example. As it appears in FIG. 2A, the two ribbons are laterally offset (a, c) in order to avoid the superposition of the overlap zones (FIG. 3A).

La figure 28 représente une variante du ruban complexe correspondant à une pose bord à bord de la partie métallique 8 et à recouvrement de la partie diélectrique 5. Dans cette variante ℓ = πd et L = πd + R en reprenait les mêmes notations que ci-dessus. Il est avantageux de réaliser le ruban complexe en prévoyant le déplacement du ruban diélectrique 5 de part et d'autre du ruban métallique 8 de façon à assurer l'étanchéité du conducteur extérieur même si le recouvrement bord à bord n'est pas rectiligne.FIG. 28 represents a variant of the complex ribbon corresponding to an edge-to-edge laying of the metal part 8 and overlapping of the dielectric part 5. In this variant ℓ = πd and L = πd + R took the same notations as shown below -above. It is advantageous to produce the complex strip by providing for the displacement of the dielectric strip 5 on either side of the metal strip 8 so as to seal the external conductor even if the edge-to-edge covering is not straight.

Les figures 3 représentent des coupes de deux variantes de paire coaxiale fabriquées par le procédé selon l'invention. L'âme centrale de cette paire est constituée d'un conducteur en cuivre 30 sur lequel est moulé le disque diélectrique 31. Un ruban diélectrique 32 est posé à recouvrement sur ledit disque 31. Il est bien entendu que ce ruban n'est pas indispensable à la réalisation de la paire. Le condensateur extérieur est constitué par le ruban métallique 8 du ruban complexe 8 - 5: Il est posé à recouvrement dans la variante de la figure 3A et bord à bord dans la variante de la figure 38.FIGS. 3 represent sections of two variants of coaxial pair produced by the method according to the invention. The central core of this pair consists of a copper conductor 30 on which the dielectric disc 31 is molded. A dielectric strip 32 is placed overlapping on said disc 31. It is understood that this strip is not essential to the making of the pair. The capacitor exterior is constituted by the metallic ribbon 8 of the complex ribbon 8 - 5: It is laid overlapping in the variant of FIG. 3A and edge to edge in the variant of FIG. 3 8 .

On n'a pas représenté de paire constituée à partir d'un ruban complexe posé bord à bord bien que cette variante puisse présenter un avantage du point de vue du prix de revient.We have not shown a pair formed from a complex ribbon placed edge to edge although this variant may have an advantage from the point of view of cost price.

La figure 4 représente schématiquement la chaîne de fabrication d'une paire coaxiale selon la figure 3A. Le conducteur central 30 en cuivre, fourni par le touret 10,pénètre-dans le poste de moulage représenté schématiquement par une chaîne 11 du type décrit dans le brevet français 2 108 142 et sa première addition 2 361 728 où il est muni de disques d'isolation 31 de diamètre d. On a représenté en 12 le poste de contrôle de diamètre des disques et en 13 le poste de pose du ruban diélectrique 32 d'isolation fourni par un touret 14. Un touret 15 fournit à l'installation la bande métallique 8 par exemple en cuivre, nécessaire à la réalisation du ruban complexe à la vitesse de défilement du conducteur central 30 à la sortie du poste de moulage 11. Un touret 17 fournit à l'installation le papier kraft 5 préalablement enduit sur la face venant en contact avec la bande métallique. Deux rouleaux 19 et 20 ayant une vitesse de rotation convenable assurent l'adhérence de la bande métallique 8 et du papier 5 constituant le ruban complexe 21. Le formeur 22 entoure l'âme de la paire coaxiale du ruban complexe 21. Une filière chauffante 26 assure le scellement du ruban composite. Un organe de tirage 24 associé au touret 25 constitue la réception de la paire terminée. On n'a pas précisé les asservissements entre les divers postes de la ligne de fabrication.FIG. 4 schematically represents the production line of a coaxial pair according to FIG. 3A. The central conductor 30 in copper, supplied by the reel 10, enters the molding station represented schematically by a chain 11 of the type described in French patent 2 108 142 and its first addition 2 361 728 where it is provided with disks of insulation 31 of diameter d. There is shown at 12 the disc diameter control station and at 13 the station for installing the dielectric insulating tape 32 supplied by a reel 14. A reel 15 supplies the installation with the metal strip 8, for example made of copper, necessary for producing the complex ribbon at the running speed of the central conductor 30 at the outlet of the molding station 11. A reel 17 supplies the installation with kraft paper 5 previously coated on the face coming into contact with the metal strip. Two rollers 19 and 20 having a suitable speed of rotation ensure the adhesion of the metal strip 8 and of the paper 5 constituting the complex ribbon 21. The former 22 surrounds the core of the coaxial pair of the complex ribbon 21. A heating die 26 seals the composite tape. A pulling member 24 associated with the drum 25 constitutes the reception of the completed pair. We did not specify the enslavements between the various positions of the manufacturing line.

A titre illustratif, la demanderesse réalise un premier type de paire coaxiale dite paire 1,2/4,4 mm, dont les caractéristiques sont les suivantes :

  • - diamètre du conducteur en cuivre intérieur : 1,2 mm
  • - nature du diélectrique, et des disques : polyéthylène et prolypropylène respectivement
  • - diamètre interne du conducteur externe : 4,4 mm
  • - épaisseur du conducteur externe : 0,1 mm
  • - largeur du ruban isolant : 18 mm
  • - épaisseur de l'isolant externe : 0,1 mm
  • - largeur de la zone de recouvrement : 3 mm
  • - impédance de la paire coaxiale : 75 ohm
  • - variations extrêmes de l'impédance : il ohm.
By way of illustration, the applicant makes a first type of coaxial pair called a 1.2 / 4.4 mm pair, the characteristics of which are as follows:
  • - inner copper conductor diameter: 1.2 mm
  • - nature of the dielectric, and of the discs: polyethylene and prolypropylene respectively
  • - internal diameter of the external conductor: 4.4 mm
  • - thickness of the external conductor: 0.1 mm
  • - width of the insulating tape: 18 mm
  • - thickness of external insulation: 0.1 mm
  • - width of the overlap area: 3 mm
  • - coaxial pair impedance: 75 ohm
  • - extreme variations in impedance: il ohm.

La demanderesse réalise aussi un deuxième type de paire coaxiale ne différant de la précédente que par la nature de l'isolant externe qui est un polyester par exemple celui vendu sous le nom de mylar par Dupont de Nemours.The applicant also produces a second type of coaxial pair differing from the previous one only in the nature of the external insulation which is a polyester, for example that sold under the name of mylar by Dupont de Nemours.

Le ruban en cuivre peut être remplacé par un ruban en aluminium d'épaisseur voisine et de même largeur ou un ruban bimétallique connu en soi.The copper strip can be replaced by an aluminum strip of similar thickness and of the same width or a bimetallic strip known per se.

Claims (6)

1 - Procédé de fabrication de paires coaxiales de petit diamètre, mécaniquement stables constituées d'un conducteur central associé à des moyens isolants calibrés assurant l'écartement et d'un conducteur extérieur, caractérisé en ce qu'il comporte les étapes suivantes : - calibrage du conducteur central ; - mise en place des moyens isolants d'écartement ; - pose en long d'un premier ruban diélectrique ; - préparation d'un ruban composite à partir d'un ruban métallique de largeur au moins égale au diamètre des moyens isolants adhérant à un deuxième ruban diélectrique de largeur supérieure ; - mise en forme du ruban composite autour du premier ruban diélectrique ; - scellement dudit ruban dans la zone de recouvrement . 1 - Method for manufacturing mechanically stable small diameter coaxial pairs consisting of a central conductor associated with calibrated insulating means ensuring separation and an external conductor, characterized in that it comprises the following steps: - calibration of the central conductor; - installation of insulating spacing means; - laying along a first dielectric tape; - Preparation of a composite tape from a metal tape of width at least equal to the diameter of the insulating means adhering to a second dielectric tape of greater width; - shaping of the composite tape around the first dielectric tape; - sealing of said tape in the overlap area. 2 - Procédé selon la revendication 1, caractérisé en ce que le deuxième ruban diélectrique est du papier présentant une face enduite d'une couche de matière plastique.2 - Method according to claim 1, characterized in that the second dielectric tape is paper having a face coated with a layer of plastic. 3 - Procédé selon la revendication 2, caractérisé en ce que le deuxième ruban diélectrique est enduit à l'aide d'un copolymère d'éthylène.3 - Process according to claim 2, characterized in that the second dielectric tape is coated using an ethylene copolymer. 4 - Procédé selon la revendication 1, caractérisé en ce que la largeur du ruban métallique est supérieure au diamètre du conducteur central muni des moyens isolants et du premier ruban diélectrique.4 - Method according to claim 1, characterized in that the width of the metal strip is greater than the diameter of the central conductor provided with the insulating means and the first dielectric tape. 5 - Procédé selon la revendication 1, caractérisé en ce que le deuxième ruban diélectrique est en matière plastique.5 - Method according to claim 1, characterized in that the second dielectric tape is made of plastic. 6 - Câble coaxial réalisé par la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce qu'il comporte à partir du centre, un conducteur central calibré en cuivre, des disques isolants moulés sur le conducteur central, un premier ruban diélectrique posé en long et un ruban complexe posé à recouvrement et scellé longitudinalement constitué d'un ruban métallique et d'un ruban diélectrique.6 - Coaxial cable produced by the implementation of the method according to claim 1, characterized in that it comprises from the center, a central conductor calibrated in copper, insulating discs molded on the central conductor, a first dielectric tape laid lengthwise and a complex ribbon laid over and sealed longitudinally consisting of a metallic ribbon and a dielectric ribbon.
EP80400256A 1979-03-12 1980-02-22 Method of manufacturing a coaxial cable Expired EP0015816B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7906263 1979-03-12
FR7906263A FR2451619A1 (en) 1979-03-12 1979-03-12 PROCESS FOR MANUFACTURING COAXIAL PAIRS AND COAXIAL PAIRS THUS MANUFACTURED

Publications (2)

Publication Number Publication Date
EP0015816A1 true EP0015816A1 (en) 1980-09-17
EP0015816B1 EP0015816B1 (en) 1984-02-08

Family

ID=9223018

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80400256A Expired EP0015816B1 (en) 1979-03-12 1980-02-22 Method of manufacturing a coaxial cable

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Country Link
EP (1) EP0015816B1 (en)
DE (1) DE3066449D1 (en)
FR (1) FR2451619A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031755A1 (en) * 1998-11-25 2000-06-02 Corning Cable Systems Llc Method and apparatus for forming a shielded electric cable
CN102290153A (en) * 2011-06-17 2011-12-21 雷特威连接系统（苏州工业园区）有限公司 Micro coaxial line wrapped conductive fabric machine
WO2012091149A1 (en) * 2010-12-27 2012-07-05 Yazaki Corporation Shielded conducting line structure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1526643A (en) * 1966-06-09 1968-05-24 Western Electric Co Method of closing the joint of the outer conductor of a corrugated coaxial cable
FR2224844A1 (en) * 1973-04-04 1974-10-31 Lignes Telegraph Telephon
FR2325164A1 (en) * 1975-09-19 1977-04-15 Fujikura Ltd Electric esp. telephone cable has internal laminated sheath - with plastics lapped edges to contact extruded outer sheath

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1059438A (en) * 1965-11-23 1967-02-22 Standard Telephones Cables Ltd Method of manufacturing an insulated electrical conductor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1526643A (en) * 1966-06-09 1968-05-24 Western Electric Co Method of closing the joint of the outer conductor of a corrugated coaxial cable
FR2224844A1 (en) * 1973-04-04 1974-10-31 Lignes Telegraph Telephon
FR2325164A1 (en) * 1975-09-19 1977-04-15 Fujikura Ltd Electric esp. telephone cable has internal laminated sheath - with plastics lapped edges to contact extruded outer sheath

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000031755A1 (en) * 1998-11-25 2000-06-02 Corning Cable Systems Llc Method and apparatus for forming a shielded electric cable
WO2012091149A1 (en) * 2010-12-27 2012-07-05 Yazaki Corporation Shielded conducting line structure
CN103282972A (en) * 2010-12-27 2013-09-04 矢崎总业株式会社 Shielded conducting line structure
US9633764B2 (en) 2010-12-27 2017-04-25 Yazaki Corporation Conducting line shield structure
CN103282972B (en) * 2010-12-27 2017-06-27 矢崎总业株式会社 Conductor shielding structure
CN102290153A (en) * 2011-06-17 2011-12-21 雷特威连接系统（苏州工业园区）有限公司 Micro coaxial line wrapped conductive fabric machine

Also Published As

Publication number Publication date
DE3066449D1 (en) 1984-03-15
FR2451619B1 (en) 1982-10-01
FR2451619A1 (en) 1980-10-10
EP0015816B1 (en) 1984-02-08

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