EP0058112A2 - Massnahme zum Zentrieren einer Kabelseele in ihrer Umhüllung, mit dieser Massnahme versehenes Kabel und dessen Herstellungsverfahren - Google Patents

Massnahme zum Zentrieren einer Kabelseele in ihrer Umhüllung, mit dieser Massnahme versehenes Kabel und dessen Herstellungsverfahren Download PDF

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Publication number
EP0058112A2
EP0058112A2 EP82400168A EP82400168A EP0058112A2 EP 0058112 A2 EP0058112 A2 EP 0058112A2 EP 82400168 A EP82400168 A EP 82400168A EP 82400168 A EP82400168 A EP 82400168A EP 0058112 A2 EP0058112 A2 EP 0058112A2
Authority
EP
European Patent Office
Prior art keywords
cable
core
fin
envelope
coating
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
EP82400168A
Other languages
English (en)
French (fr)
Other versions
EP0058112A3 (en
EP0058112B1 (de
Inventor
Jean-Pierre Hulin
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 EP0058112A2 publication Critical patent/EP0058112A2/de
Publication of EP0058112A3 publication Critical patent/EP0058112A3/fr
Application granted granted Critical
Publication of EP0058112B1 publication Critical patent/EP0058112B1/de
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
    • H01B13/06—Insulating conductors or cables
    • H01B13/10—Insulating conductors or cables by longitudinal lapping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring

Definitions

  • the present invention relates to a coating intended to ensure the centering of a cable core in its envelope, a cable comprising such a device and its manufacturing process.
  • the present invention thus relates to a coating which ensures the centering of a cable core in its envelope and which at the same time ensures mechanical decoupling between the cable core and its envelope.
  • the coating according to the invention consists of a sheath provided with at least one elastic fin, so that the mechanical stresses are supported by the envelope and the sheath without being retransmitted to the actual core of the cable.
  • the invention also relates to a method of manufacturing such a coating in which the edges of at least one are brought into coincidence.
  • ribbon over a predetermined width, around the core of a cable and. where said edges are joined together on at least part of said width so as to produce at least one elastic fin.
  • FIG. 1 represents a cable described in the aforementioned French patent 1,593,816. It comprises a core 1 coated with ribbons 2 made of plastic material and of a sheath 3 also made of plastic material provided with fins 4 which are longitudinal or not very long, called to delimit empty spaces 6 between the sheath 3 and its metallic envelope.
  • the metal casing 5 is tightened fairly tightly on the bearing ends of the fins 4 so as to prevent the cable from slipping inside its casing.
  • this rigid anchoring does not provide satisfactory centering, because it transmits to the core of the cable all the stresses to which the envelope is subjected during the unwinding and winding of the cable or when the cable is in operation.
  • FIG. 2 represents a cable according to the invention, the core 7 of which is surrounded by a covering 8 provided with elastic fins 10 and an envelope 12, possibly wavy. Spaces 11 remain between the covering 8 and the casing 12 and the fins 10 have a height p at least equal to the dimension of the spaces 11 in a radial direction, hereinafter referred to as depth, which corresponds to the play existing between the core of the cable and its envelope.
  • the centering of the core relative to the envelope loppe is not a centering imposed by a mechanical blocking, but a self-centering which is achieved by the elastic recovery of the fins 10 when they are moved from a state of equilibrium.
  • the self-centering of the core thereof makes it possible to avoid constraints due to the winding or unwinding lengths which would be different for an off-center core and envelope .
  • the connection between the core and its envelope is achieved simply by the friction forces between the fins and the internal face of the envelope, the mechanical and / or thermal stresses to which the envelope is susceptible to be submitted to the operating site will result in a relative translation of the envelope and the core without, however, this being subject to constraints. Indeed, the only forces present in practice are those corresponding to the friction of the core with respect to the envelope or to an ovalization of the envelope, and the stresses which result therefrom are almost entirely absorbed by the fin (s).
  • a polypropylene covering 0.2 mm thick and fins 0.4 mm in diameter have been used. thickness and 1 mm in height, this height being at least equal to the depth of the spaces 11.
  • the respective thicknesses of a coating of high density polyethylene and fins are, for example, 0.1 mm and 0.2 mm and on the other hand the height of the fins is 0.4 mm.
  • the play existing between the core of the cable and its envelope is generally determined by the maximum ovalization to which the envelope is likely to be subjected during the use of the cable or by the necessary average play between the core of the cable and its envelope, which makes it possible to determine the minimum height of the fins.
  • the specifications of the cable in question make it possible to determine ner the maximum eccentricity tolerated for the cable core with respect to its envelope.
  • any eccentricity results, during the winding and unwinding operations, by a different length due to the fact that the winding radii are not entirely identical, which generates stresses at the core of the cable.
  • the setting of a maximum offset value makes it possible to correlatively limit the stresses undergone by the cable core. This is important in the case of optical fiber cables, the optical fibers being able to withstand only low stresses. Otherwise, their performance will deteriorate.
  • the definition of the maximum tolerated eccentricity then makes it possible to choose the nature of the material of the fins according to its modulus of elasticity E as well as the thickness of the fins so that the weight of the core produces at rest only one offset less than the maximum tolerated offset.
  • the frictional forces between the covering fin (s) and the cable envelope are sufficient to prevent relative sliding of the core and the envelope when the cable is vertical, and / or presence of vibrations when the cable is laid.
  • the height of the fin (s) will be chosen greater than the clearance existing between the core of the cable and its casing so that the 10 "fin or fins (FIG. 4 b ) have an initial deformation, with or without prestressing when the casing is laid, thus creating in the first case a prestressing force increasing the friction (the folding of the fins has been exaggerated in FIG. 4 b).
  • fins of section other than rectangular in order to obtain a structure of equal resistance, for example by extrusion. It is thus possible to use fins with a truncated parabolic profile or else with a trapezoidal profile. The calculation is then done according to the same laws.
  • FIG. 3 illustrates a method of manufacturing a coating according to the invention, in which ribbons 18 disposed on coils 14, here 4 in number, distributed around the core 7 to be coated, are brought into coincidence on their edges, over a width corresponding to the desired height for the fins, their edges then being welded at this level.
  • the core is animated by an axial translational movement along arrow F and the ribbons 18 see their edges brought into contact at 21 as they unfold, at the level of grooves 20 formed on the face internal of a guide cylinder 19, the axis of which is the axis of movement of the core 7.
  • heads or pairs of welding heads are arranged which weld the portions of ribbon brought into contact by the grooves 20.
  • the cylinder 19 is replaced by pairs of rollers with axes parallel to the axis of movement of the core 7 of the cable, and which are spaced so as to pinch two thicknesses of ribbons 18.
  • pairs of rollers will be used per groove 10 and the tape portions will be welded between the two pairs of rollers.
  • a covering 8 made from ribbons welded at their edges will have the shape shown in FIG. 2, that is to say that the edges of the ribbon 18 are integral on a thinner part corresponding to approximately two thicknesses of the ribbon up to 'to a projecting portion forming a thicker portion 9 which has a diameter slightly greater than the average diameter of the coating 8.
  • a covering 8 provided with elastic fins 10 can be produced by extrusion in a extruder through a head whose profile corresponds to that of the covering 8.
  • a covering 8 produced by extrusion has been shown in partial section and comprising fins 10 'profiled from a wide portion 22, which connect them to the cylindrical contour of the coating, to a narrow portion 23 at their ends, for example according to a truncated or trapezoidal parabolic profile.
  • the fins 10 can be longitudinal. They can also be helical or with alternating pitch: in the case of manufacture from strips, all of the coils 14 and the guide cylinder 19, or the pairs of rollers, will be given a corresponding movement around the axis of movement of the core 7; or else the core 7 will be rotated about its axis of movement, for example by rotating a coil which receives it and / or a reel which delivers it, around an axis perpendicular to its longitudinal axis. In the case of manufacture by extrusion, the extrusion apparatus will be rotated or else, as mentioned above, the core of the cable.
  • the centering of the cable in its envelope can be carried out using an envelope provided with a single fin, preferably helical or with alternating pitch.
  • a propeller or an alternating pitch will have a fairly short pitch, for example of the order of magnitude of the coating diameter, so that the eccentricity of the cable core, which will be compensated at worst half a step further by the elastic recovery of the fin, is corrected effectively.
  • the space or clearance existing between the cylindrical part of the covering 8 and the casing 12 is greater than the space or the clearance which is tolerated between the core of a cable and its outer casing in the cable technique in general, and in particular in the case of a cable as described in French patent 1,593,816. This greater play is used for the self-centering that the coating according to the invention allows.
  • the depth of the fin or fins is periodically variable between a maximum value and a minimum value, this variation being out of phase in the case of several fins.
  • the drums 14 are mounted on an eccentric, the eccentricity of which corresponds to the amplitude of variation of the depth of the fins and the speed of rotation of which will define the pitch of the variation, in relation to the speed of travel of the cable core.
  • a extruder will be used provided with a variable extrusion profile at the level of the fins, the variation being controlled for example by an eccentric.
  • the variation in depth of the fins will make it possible to have an extra length of the core of the cable inside the envelope, the core of the cable coated with its fin sheath being positioned in a helix due to the periodic variation of the depth. fins, and therefore around an average position corresponding to centering.
  • the pull on the envelope will produce a slight elongation thereof (for example of the order of 0.5%), so that after unwinding, the lengths of the cable and core will be equal.
  • the core of the cable will no longer necessarily be centered, which is only of little importance for a laid cable. Indeed, only mechanical (ovalization of the envelope) and / or thermal stresses will be undergone by the cable, and for these the precise centering of the core is not important.
  • the invention is not limited to the embodiments described. above. Thus, it is not necessary that the fins are made of the same material as the cylindrical part of the coating 8. On the other hand, the fins, whether or not made of the same material as the coating 8 in its cylindrical part, can be reinforced with one or more elastic tapes.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
EP19820400168 1981-02-06 1982-01-29 Massnahme zum Zentrieren einer Kabelseele in ihrer Umhüllung, mit dieser Massnahme versehenes Kabel und dessen Herstellungsverfahren Expired EP0058112B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8102413A FR2499757A1 (fr) 1981-02-06 1981-02-06 Revetement destine a assurer le centrage d'une ame de cable dans son enveloppe, cable comportant un tel dispositif et son procede de fabrication
FR8102413 1981-02-06

Publications (3)

Publication Number Publication Date
EP0058112A2 true EP0058112A2 (de) 1982-08-18
EP0058112A3 EP0058112A3 (en) 1982-09-08
EP0058112B1 EP0058112B1 (de) 1985-10-09

Family

ID=9254939

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820400168 Expired EP0058112B1 (de) 1981-02-06 1982-01-29 Massnahme zum Zentrieren einer Kabelseele in ihrer Umhüllung, mit dieser Massnahme versehenes Kabel und dessen Herstellungsverfahren

Country Status (5)

Country Link
EP (1) EP0058112B1 (de)
JP (1) JPS57151904A (de)
CA (1) CA1188137A (de)
DE (1) DE3266727D1 (de)
FR (1) FR2499757A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116408248A (zh) * 2023-04-25 2023-07-11 长飞光纤光缆(上海)有限公司 一种成形台钢带防抖动装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE427707A (de) * 1937-04-30
DE937172C (de) * 1952-10-22 1955-12-29 Hirschmann Richard Fa Fuehrungskoerper zur Fuehrung von Hochfrequenz-Bandkabeln in Rohren
GB918794A (en) * 1960-07-04 1963-02-20 Raymond Charles Mildner Improvements in or relating to co-axial cables
DE2421173A1 (de) * 1974-05-02 1975-11-20 Kabel Metallwerke Ghh Koaxiales hochfrequenzkabel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116408248A (zh) * 2023-04-25 2023-07-11 长飞光纤光缆(上海)有限公司 一种成形台钢带防抖动装置

Also Published As

Publication number Publication date
EP0058112A3 (en) 1982-09-08
FR2499757B1 (de) 1983-09-09
CA1188137A (en) 1985-06-04
JPS57151904A (en) 1982-09-20
FR2499757A1 (fr) 1982-08-13
EP0058112B1 (de) 1985-10-09
DE3266727D1 (en) 1985-11-14

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