EP0014621B1 - Câble coaxial à isolation composite pour télécommunication, procédé de pose de l'isolation extérieure d'un tel câble et dispositif de mise en oeuvre de ce procédé - Google Patents

Câble coaxial à isolation composite pour télécommunication, procédé de pose de l'isolation extérieure d'un tel câble et dispositif de mise en oeuvre de ce procédé Download PDF

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Publication number
EP0014621B1
EP0014621B1 EP19800400103 EP80400103A EP0014621B1 EP 0014621 B1 EP0014621 B1 EP 0014621B1 EP 19800400103 EP19800400103 EP 19800400103 EP 80400103 A EP80400103 A EP 80400103A EP 0014621 B1 EP0014621 B1 EP 0014621B1
Authority
EP
European Patent Office
Prior art keywords
ribbon
coaxial cable
insulation
outer conductor
adhesive
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.)
Expired
Application number
EP19800400103
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0014621A1 (fr
Inventor
Noel Girardon
Jean-Claude Staath
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.)
Lignes Telegraphiques et Telephoniques LTT SA
Original Assignee
Lignes Telegraphiques et Telephoniques LTT 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 Lignes Telegraphiques et Telephoniques LTT SA filed Critical Lignes Telegraphiques et Telephoniques LTT SA
Publication of EP0014621A1 publication Critical patent/EP0014621A1/fr
Application granted granted Critical
Publication of EP0014621B1 publication Critical patent/EP0014621B1/fr
Expired 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
    • 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
    • H01B13/0165—Apparatus or processes specially adapted for manufacturing conductors or cables for manufacturing co-axial cables of the layers outside the outer 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
    • H01B13/06—Insulating conductors or cables
    • H01B13/10—Insulating conductors or cables by longitudinal lapping

Definitions

  • the subject of the invention is a coaxial cable, therefore for telecommunications, in which the insulation is produced. by a suitable tape laid with overlap.
  • the subject of the invention is thus a cable comprising an external insulation which can be produced on the line for manufacturing the cable which is the subject of the second patent cited without modifying the running speed, because it does not include a covering operation. .
  • Another advantage of the present invention consists in the low cost of insulation resulting as much from the low price of the materials used as from the simplicity of implementation.
  • the combination of these two tapes provides mechanical protection of the structure and insulation.
  • the cushioning mattress formed by the first tape in fact protects the second tape against external shocks and the second tape with high dielectric strength provides electrical insulation.
  • the bonding region of the first strip on the external conductor preferably concerns less than 30% of the surface of the first strip.
  • the first ribbon may be of cellular or corrugated plastic.
  • the bonding regions of the second ribbon on the first may be angularly offset with respect to the bonding regions of the first ribbon on the outer conductor.
  • it uses an adhesive whose elongation at break is greater than 300% at 20 ° C.
  • the elasticity of the adhesive material provides a certain freedom of movement of the insulation with respect to the external conductor and of the tapes between them which ensures the mechanical protection of the structure during subsequent manipulations (assembly, placing on a reel, etc.). ).
  • the first group of two glue applicators can be such that the region for bonding the first tape to the internal outer conductor less than 30% of the surface of the first ribbon.
  • Adhesive applications can advantageously contain an adhesive whose elongation at break is greater than 300% at 20 ° C.
  • FIG. 1 There is shown in FIG. 1 the different stages of the insulation of a coaxial structure according to the present invention.
  • This structure can, for example, be of the type described in French patent No 2 216 652.
  • 6 a preparation operation intended to remove from the surface any foreign body which would interfere with the following operations, in 7 gluing the first ribbon preferably limited to two strips of approximately 1 mm wide parallel to the axis of the structure, at 8 laying it along the first ribbon, at 9 the gluing of two narrow strips of the second ribbon and at 10 the laying of said tape, an insulation control 11 is provided before storage 12 or use, on an assembly machine for example, of the isolated structure thus formed.
  • Fig. 2 shows a sectional view of the preferred variant of coaxial structure, isolated according to the present invention.
  • a transversely corrugated dielectric tape 17 is crushed between 16 and the outer conductor 18.
  • This structure is that described in French patent No 2 216 652. It is insulated by a composite set of tapes which provides mechanical protection of the structure, the first tape 19 is made of material which is sufficiently soft to absorb transverse stresses and a second tape 20 made of material, ensuring the required dielectric strength.
  • the tape 19 is laid with contiguous edges and the tape 20 is overlapped, the connection lines of the edges being angularly offset as it appears at 21 and 22.
  • the tape 19 is glued to the conductor 18 along two generators 23 and 24 respectively. and the ribbon 20 is glued to the ribbon 19 along the generator 25 and on itself according to the generator 26. 25 and 26 are angularly offset with respect to 23 and 24.
  • the first ribbon can be in Kraft paper laid edge to edge, the second in polypropylene laid overlap and bonding is limited to two generatrices of the cable for each ribbon with an angular offset sufficient so that the glued areas do not overlap, these generatrices being arranged in the vicinity of the edges.
  • the first strip may also be made of plastic, solid or cellular, smooth or corrugated. It can also be composite such as a coated paper.
  • the second strip is necessarily continuous and of high dielectric strength to define the insulation. It advantageously has a surface condition which facilitates the subsequent use of the isolated structure (storage on a reel, assembly, etc.).
  • the ribbon 19 consists of Kraft paper at 96 g / m 2 commonly used in cable making; the tape 20 is polypropylene 0.1 mm thick and the glue is of the "Hot melt” type sold by the Rousselot Company - 8, rue Christophe Colomb in Paris.
  • the glue is of the "Hot melt” type sold by the Rousselot Company - 8, rue Christophe Colomb in Paris.
  • Such insulation makes it possible to maintain a potential difference of 10,000 V DC for 1 minute between two pairs in contact with each other. It is understood that the number and the width of the glued areas are not linked to the insulation and depend on the nature of the adhesive used. Other variants have also given good results.
  • Lafig. 3 show the elements to be added to a coaxial cable manufacturing line according to French Patent No. 2,224,844 to provide insulation according to the present invention.
  • the drawing member and the reel for receiving the production line are shown in 51 and 52 respectively in accordance with the references of these elements in the cited patent.
  • Such a preparation usually consists of wiping the cable to remove traces of oil resulting from the shrinking for calibration. This operation, common in cables, can be ensured by brushing or by passing through a felt ring.
  • 71 and 72 represent the adhesive applications on the external conductor (step 7).
  • the 18, 71 and 72 are arranged symmetrically with respect to the generator along which the gap (21 in FIG. 2) of the first element 19 of the composite insulation will be located, provided by the unwinder 73 at constant tension and centered by the guide 74.
  • a die 75 ensures pressure in line with the glued generator and the fixing of the first insulating tape by adhesion of the threads 71 ′ and 72 ′ of glue still liquid on the external conductor (step 8).
  • the die 75 is produced as is well known.
  • the second element 20 of the insulation is provided by the unwinder 79 and guided at 80 so as to come to be applied to the first insulator. There is shown at 21 the contiguous edges of the first strip 19 after installation.
  • the glue applicators 76 and 77 are arranged on the side and on the other side of the connection line 21 and sufficiently spaced therefrom so that the adhesive threads 76 ′ and 77 ′ do not overlap 71 ′ and 72 ′ taking into account the oscillations that can occur during manufacture (step 9) .
  • An orienting finger 85 is arranged downstream of the two applicators at a point where the die 81 ensures the shaping of the ribbon 20 (step 10).
  • This tape is overlapped as it appears at 22.
  • the tape 19 is for example made of Kraft paper about 0.1 mm thick and the polypropylene tape 20 of 0.1 mm thick and the glue is the one mentioned above.
  • the quantity of glue which must be deposited per unit of time depends on the diameter of the extruded bead of glue, which is fixed by the surface to be glued and on the speed of travel of the cable.
  • a glue supply circuit for applicators 71-72 and 76-77 which is controlled by the cable running speed, for example from the draw 51. This control can be ensured by controlling the flow rate adhesive.
  • the insulation control (step 11) is carried out at 82 by a standard bursting device.
  • the line which has just been described corresponds to the preferred structure of FIG. 2. It is understood that the double layer insulation according to the present invention can be ensured from other tapes as already mentioned. In some cases, these can be pre-glued and the applicators and their supply are unnecessary. To reactivate the adhesive, it is usually necessary to use heated dies, such as 75.
  • the insulation of coaxial cables in accordance with the invention does not modify their electrical characteristics.
  • the Applicant has assembled twelve isolated coaxial pairs according to the invention and twelve naked coaxial pairs of the same manufacture. The measurements of regularity of impedance and weakening in reflection on the two assemblies gave the same results.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Insulated Conductors (AREA)
EP19800400103 1979-02-12 1980-01-22 Câble coaxial à isolation composite pour télécommunication, procédé de pose de l'isolation extérieure d'un tel câble et dispositif de mise en oeuvre de ce procédé Expired EP0014621B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7903440A FR2448771A2 (fr) 1979-02-12 1979-02-12 Procede de fabrication de cables coaxiaux et machine de mise en oeuvre
FR7903440 1979-02-12

Publications (2)

Publication Number Publication Date
EP0014621A1 EP0014621A1 (fr) 1980-08-20
EP0014621B1 true EP0014621B1 (fr) 1984-01-25

Family

ID=9221834

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800400103 Expired EP0014621B1 (fr) 1979-02-12 1980-01-22 Câble coaxial à isolation composite pour télécommunication, procédé de pose de l'isolation extérieure d'un tel câble et dispositif de mise en oeuvre de ce procédé

Country Status (3)

Country Link
EP (1) EP0014621B1 (enrdf_load_stackoverflow)
DE (1) DE3066220D1 (enrdf_load_stackoverflow)
FR (1) FR2448771A2 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102024531B (zh) * 2010-12-21 2012-06-27 河南省通信电缆有限公司 一种线缆纵包方法及其纵包模具以及市话电缆生产方法
CN107460825A (zh) * 2017-08-23 2017-12-12 柳州欧维姆机械股份有限公司 一种pvf膜包覆拉索索体的方法
CN113963862A (zh) * 2021-11-15 2022-01-21 贵州天虹志远电线电缆有限公司 一种成缆机用水平绕包装置
CN114446549B (zh) * 2022-02-23 2024-01-19 上海申远高温线有限公司 一种电线绕包机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR873585A (fr) * 1940-07-06 1942-07-13 Hermes Patentverwertungs Gmbh Procédé de recouvrement de conducteurs électriques par un ou plusieurs rubans isolants apposés parallèlement à l'axe
US2372645A (en) * 1941-06-13 1945-04-03 Boris J Barmack Guide for applying insulation to conductors
BE479591A (enrdf_load_stackoverflow) * 1946-08-23
GB1059438A (en) * 1965-11-23 1967-02-22 Standard Telephones Cables Ltd Method of manufacturing an insulated electrical conductor
FR2224844B1 (enrdf_load_stackoverflow) * 1973-04-04 1976-07-23 Lignes Telegraph Telephon

Also Published As

Publication number Publication date
EP0014621A1 (fr) 1980-08-20
FR2448771B2 (enrdf_load_stackoverflow) 1982-06-04
FR2448771A2 (fr) 1980-09-05
DE3066220D1 (en) 1984-03-01

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