EP1158542B1 - Biegsames Koaxialkabel und sein Herstellungsverfahren - Google Patents

Biegsames Koaxialkabel und sein Herstellungsverfahren Download PDF

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Publication number
EP1158542B1
EP1158542B1 EP01401370A EP01401370A EP1158542B1 EP 1158542 B1 EP1158542 B1 EP 1158542B1 EP 01401370 A EP01401370 A EP 01401370A EP 01401370 A EP01401370 A EP 01401370A EP 1158542 B1 EP1158542 B1 EP 1158542B1
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EP
European Patent Office
Prior art keywords
tape
cable
windings
metal
insulation
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 - Lifetime
Application number
EP01401370A
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English (en)
French (fr)
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EP1158542A1 (de
Inventor
Pascal Clouet
Jean-Francois Guinot
Jean-Jacques Maisseu
Francois Vaille
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexans SA
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Nexans SA
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Publication date
Application filed by Nexans SA filed Critical Nexans SA
Publication of EP1158542A1 publication Critical patent/EP1158542A1/de
Application granted granted Critical
Publication of EP1158542B1 publication Critical patent/EP1158542B1/de
Anticipated expiration legal-status Critical
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    • 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
    • H01B11/183—Co-axial cables with at least one helicoidally wound tape-conductor

Definitions

  • the present invention relates to flexible coaxial cables and more particularly those of small section, which are usable in particular in medical imaging, or on portable transmission equipment such as computers, or for microwave transmissions.
  • GB-A-2 130 430 discloses a flexible coaxial cable, which has a flexible conductive core, flexible insulation around said soul, a flexible conductor screen around said insulation and a possible flexible outer protective sheath.
  • the screen of this cable is consisting of an internal metal ribbon, which is folded longitudinally around the insulation, an external metal ribbon, which is wound helically around the inner ribbon, and a possible metallic braid, which is then mounted around the outer ribbon and intended to allow make a connection to the screen at the ends of the cable. Ribbon edges internal overlap or are welded along the cable and those of the ribbon external overlap widely from one winding to the next.
  • Each of the ribbons can be in a single metal or be made of composite material by example tinned copper or plastic / metal laminate.
  • the outer ribbon serves to cover cracks or fissures, which are likely to appear in the ribbon internal under the effect of folds / unfolding of the cable. Its windings have however, they themselves tend to move during these folds / unfoldings of the cable, which modifies the contact resistance and the geometry assembly of the windings between them and on the inner ribbon, leading to a helical current path in this outer ribbon and limiting the performance of the screen.
  • EP-A-0 236 096 also discloses a coaxial cable flexible, which avoids the disadvantages of the cable known from the aforementioned document and has for this purpose a screen with a laid copper ribbon longitudinally or helically wrapped around the insulation by having overlapping edges, a copper braid around this ribbon and a layer of metal closing the opening along the overlapping edges said ribbon and the interstices of the braid and coming to secure the braid and said tape, so that the screen is flexible and without openings.
  • the coaxial cable thus obtained is flexible while having a screen performance.
  • the layer of metal between the braid and the ribbon no uniform thickness all around the cable, due to its fluidity in the state molten.
  • the method of manufacturing such a screen is long and dresser. As indicated in this document, it can not be realized in online, because of the very different speeds of setting up its different parts. The setting up of the braid being much slower than that of the other parties.
  • a braid tight is advantageous for a good shutter possible of its interstices by melted metal, it makes it more difficult and uncertain a good flow of the molten metal through it for its bond to the ribbon and the closing the opening line of the edges of the ribbon.
  • the use a molten tin bath requires safety devices to prevent risk of burns and inhalation of vapors.
  • the present invention aims to provide a flexible coaxial cable having a reliable screen structure leading to excellent performance and stable over time and allowing a manufacturing process particularly simple and fast.
  • a flexible coaxial cable comprising a core flexible conductor, flexible insulation around said core and a screen flexible metal around said insulation, said screen having a first metal ribbon with metal coating on at least a face thereof and wound helically around said insulation in having successive windings overlapping in a zone of continuous helical overlap along said cable, is characterized in that that said first ribbon is closed tightly on itself in any said area of overlap of said windings by said coating welding said windings to each other.
  • a flexible coaxial cable having a flexible conductive core, flexible insulation around said core and a flexible metal screen around said insulation, said screen having a first metal ribbon and a second ribbon outer metal wound helically around said insulation and provided at least for one of them with a metallic coating on the least one face thereof
  • each of said ribbons has windings with a continuous helical gap along said cable, what the windings of said second ribbon totally cover the dejoining the first ribbon and partially the windings of said first ribbon, and in that the overlapping areas of the windings of said ribbons are sealingly welded by said coating provided on to least one of the two faces opposite said ribbons.
  • the subject of the invention is also a process for manufacturing said cable, characterized in that it consists in subjecting the cable provided with said screen to a peripheral welding heater of the windings of each ribbon component said screen, without external input welding material.
  • the peripheral heating of welding is ensured by a high-frequency induction coil, mounted on a continuous production line of said screen.
  • the cable comprises a conductive core flexible 1, a flexible insulation 2 covering said core and a flexible screen 3 surrounding said insulation.
  • This flexible screen 3 is constituted by a metal strip 4, which is provided with a metal coating 5 on at least its outer face, is helically wrapped around the insulation, having its windings overlapping widely, and is closed tightly on itself by said coating welding said coils to each other in any their area of overlap.
  • the overlap noted 6 of the windings is illustrated by 50%. In it can be less, however, being at least 20 to 25% and preferably of the order of 40%. It defines the area of overlap welded, without the addition of external material, which is helical and along the cable for a perfect seal and conservation of performance of the screen 3 thus formed.
  • the conductive core 1 is a massive core single conductor or stranded stranded core, for example bare copper, tinned, silver or copper alloy or steel covered with copper.
  • the insulation is a conventional or expanded dielectric, such as PTFE, FEP, PFA, PE or PP.
  • the screen 4 is preferably made by a ribbon tinned copper, whose tin coating is melted for soldering direct from its coils to each other throughout their entire area of overlap.
  • the ribbon 4 can be tinned on both sides.
  • This cable is advantageously a coaxial cable diameter on the insulation 2 between 0.2 and 8 mm.
  • the ribbon used 4 has a width of 0.2 to 15 mm and has a winding pitch of 0.12 to 10 mm, depending on the diameter of the insulation.
  • the cable can of course be provided with an outer sheath of protection, which is optional and not shown.
  • the ribbon 14 is advantageously constituted by a laminated ribbon plastic / metal whose plastic side is against insulation 2.
  • Ribbons 16 and 18 are advantageously constituted by metal ribbons, for example made of copper, and provided with metal coating layers 17 and 19, by example tin or tin-based or, at least on their inner side.
  • the ribbons 16 and 18 are wound in the same direction and at the same not, being shifted relative to each other on the order of 1 ⁇ 4 to 3 ⁇ 4 of the value of the winding pitch. They are welded to each other and to the ribbon 14 by the covers 17 and 19.
  • each of the two helical ribbons 16 and 18 has its windings overlapping widely.
  • the inner longitudinal ribbon 14 is optional.
  • each of the helical ribbons 16 and 18 presents a 16 'and 18' between its windings, this gap being continuous along the cable.
  • the coils of the outermost helical ribbon 18 overlap totally the splice 16 'of the ribbon 16 and partially the windings of this one.
  • the longitudinal tape 14 is optional in the cable screen.
  • the cable of FIG. 2 or 3 may also comprise a sheath external protection, not shown. Its dimensions and not winding of its helical ribbons are as defined for the cable of Figure 1.
  • the cable may comprise a longitudinal ribbon (such as ribbon 14 in Figure 2 or 3) under the ribbon helical 4, the latter then being provided with an inner metal coating and optionally the outer metal coating 5.
  • insulated conductor denoted by references 1 and 2 is taken from a coil 20 and passes through a tape station 22, which receives the tape 4 5.
  • This tape is taken from a roll 21 and is helically wrapped around the isolated core, as described next to Figure 1.
  • the cable provided with this ribbon then passes to a station 23 of welding of the ribbon windings to each other, in which the welding is carried out, without external contribution of welding material, directly by the coating 5.
  • This welding station comprises at this effect an induction coil 24 fed at high frequency, which ensures the melting of the coating 5 and the resultant welding of the coils each to others.
  • the cable provided with its screen 3 thus sealed is stored on a receiving coil 25.

Landscapes

  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)

Claims (9)

  1. Flexibles Koaxialkabel, das eine leitende flexible Seele (1), um die besagte Seele eine flexible Isolation (2) und um die besagte Isolation einen metallischen Schirm (2, 13, 13') aufweist, wobei der besagte Schirm einen ersten metallischen wenigstens auf seiner einen Fläche mit einem metallischen Überzug (5, 7) versehenen und schraubenförmig um die besagte Isolation umwickelten Band (4, 16) aufweist, welcher einander folgende sich entlang des besagten Kabels nach einer schraubenförmigen ununterbrochenen Überlappungszone überlappende Wicklungen aufweist, dadurch gekennzeichnet, dass der besagte erste Band (4) in der ganzen besagten Überlappungszone der besagten Wicklungen von dem besagten Überzug (5), welcher die besagten Wicklungen aneinander schweißt, an sich selbst dicht verschlossen ist.
  2. Flexibles Koaxialkabel nach Anspruch 1, dadurch gekennzeichnet, dass es einen zweiten schraubenförmig über den besagten ersten Band (6) umwickelten metallischen Band (18) aufweist, wobei dieser einander überlappende wenigstens auf derjenigen seiner Flächen, die auf den ersten Band zeigt, mit einem metallischen Überzug versehene Wicklungen aufweist, und wobei seine Wicklungen miteinander und mit denjenigen des besagten ersten Bandes verschweißt sind.
  3. Flexibles Koaxialkabel, das eine leitende flexible Seele (1), um die besagte Seele eine flexible Isolation (2) und um die besagte Isolation einen metallischen Schirm (13') aufweist, wobei der besagte Schirm einen ersten metallischen Band (16) und einen zweiten äußeren metallischen Band (18) aufweist, welche schraubenförmig um die besagte Isolation umwickelt sind und wenigstens für einen unter ihnen mit einem metallischen Überzug (17, 19) auf wenigstens einer ihrer Flächen versehen sind, dadurch gekennzeichnet, dass jeder der besagten Bänder (16, 18) entlang des besagten Kabels Wicklungen mit kontinuierlicher schraubenförmiger Fügungslücke (16', 18') aufweist, dass die Wicklungen des besagten zweiten Bandes (18) komplett die Fügungslücke des ersten Bandes (16) bedecken, und dass die Bedeckungszonen der Wicklungen der besagten Bänder von dem besagten Überzug (17, 9), welcher auf mindestens einer der beiden zueinander zeigenden Flächen der jeweiligen Bänder vorgesehen ist, dicht verschweißt sind.
  4. Kabel nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der besagte Schirm außerdem einen inneren metallischen längs um die besagte Isolation angebrachten Band (14) aufweist, dessen Ränder (15) sich überlappen.
  5. Kabel nach dem Anspruch 4, dadurch gekennzeichnet, dass der besagte innere Band (14) aus einem Kunststoff/Metallaminat besteht.
  6. Kabel nach einem der Ansprüche 1 und 3, dadurch gekennzeichnet, dass der besagte erste Band (4, 16) eine Steigung der Wicklung von 0,2 bis 10 mm und dass das besagte Kabel auf der besagten Isolation einen Durchmesser von 0,2 bis 8 mm aufweist.
  7. Kabel nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass jeder mit dem Metallüberzug versehene Band aus verzinntem Kupfer besteht.
  8. Verfahren für die Herstellung eines Kabels nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass es darin besteht, zur Schweißung der Wicklungen jedes Bandes, das den besagten Schirm bildet, das mit dem Schirm versehene Kabel ohne Zugabe von Schweißzusatzstoff einer Umfangsbeheizung zu unterziehen.
  9. Verfahren nach dem Anspruch 8, dadurch gekennzeichnet, dass es darin besteht, die besagte Umfangsbeheizung mittels einer hochfrequentig gespeisten Induktionswicklung (24) zu gewährleisten, welche auf einer endlosen Ausführungslinie des besagten Schirms auf das Kabel vorgesehen ist und vom besagten Kabel durchlaufen wird.
EP01401370A 2000-05-25 2001-05-23 Biegsames Koaxialkabel und sein Herstellungsverfahren Expired - Lifetime EP1158542B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0006689A FR2809528B1 (fr) 2000-05-25 2000-05-25 Cable coaxial flexible et procede de fabrication de celui-ci
FR0006689 2000-05-25

Publications (2)

Publication Number Publication Date
EP1158542A1 EP1158542A1 (de) 2001-11-28
EP1158542B1 true EP1158542B1 (de) 2005-08-10

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EP01401370A Expired - Lifetime EP1158542B1 (de) 2000-05-25 2001-05-23 Biegsames Koaxialkabel und sein Herstellungsverfahren

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US (1) US6583361B2 (de)
EP (1) EP1158542B1 (de)
AT (1) ATE301867T1 (de)
DE (1) DE60112509T2 (de)
FR (1) FR2809528B1 (de)

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Also Published As

Publication number Publication date
ATE301867T1 (de) 2005-08-15
FR2809528B1 (fr) 2002-07-19
DE60112509D1 (de) 2005-09-15
US20020003046A1 (en) 2002-01-10
US6583361B2 (en) 2003-06-24
FR2809528A1 (fr) 2001-11-30
DE60112509T2 (de) 2006-06-01
EP1158542A1 (de) 2001-11-28

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