EP3074985B1 - Data line and method for producing the data line - Google Patents

Data line and method for producing the data line Download PDF

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Publication number
EP3074985B1
EP3074985B1 EP14812416.7A EP14812416A EP3074985B1 EP 3074985 B1 EP3074985 B1 EP 3074985B1 EP 14812416 A EP14812416 A EP 14812416A EP 3074985 B1 EP3074985 B1 EP 3074985B1
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EP
European Patent Office
Prior art keywords
data line
conductive layer
foil
conductive
end edge
Prior art date
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EP14812416.7A
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German (de)
French (fr)
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EP3074985A1 (en
Inventor
Erwin Köppendörfer
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Leoni Kabel GmbH
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Leoni Kabel GmbH
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Publication of EP3074985A1 publication Critical patent/EP3074985A1/en
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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
    • H01B11/1895—Particular features or applications
    • 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
    • H01B13/2693—After-treatment
    • 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
    • H01B11/1826—Co-axial cables with at least one longitudinal lapped tape-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
    • H01B13/14—Insulating conductors or cables by extrusion
    • 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

Definitions

  • the invention relates to a data line with the features of the preamble of claim 1, in particular for use in a motor vehicle and a method for producing such a data line.
  • coaxial cable data line is for example from the US Pat. No. 7,084,343 B1 refer to.
  • the coaxial cable described therein has a central inner conductor, an insulation surrounding this as a dielectric, a multi-layered shielding as an outer conductor and an outer sheath.
  • the multi-layered shield is formed from a longitudinally folded screen foil and a screen braid mounted above it.
  • the coaxial cable is comparatively stiff.
  • this is designed in the manner of a corrugated pipe, as is known in the case of the so-called semi-rigid cables.
  • such a cable is less suitable for use in the automotive sector for cost reasons, especially because of the multi-layer shield structure.
  • One of the biggest cost and time factors is namely the formation of the shield. It is technically used to keep away from the trapped inside the coaxial line disturbing radiation and also for bundling and guiding a propagating field.
  • the shielding is usually made of a braid, more rarely also of a helical shield or a foil screen. In a number of lines, there are also combinations of different umbrella structures. With a braid shield, only slow velocities can be rearranged during production, which lead to a very large machine park on braided machines, which naturally requires a lot of staff, space and energy.
  • Semi-rigid cables are coaxial cables whose outer conductor consists of a closed tube. These lines have excellent electrical properties but are difficult to manufacture, expensive and almost inflexible.
  • a coaxial cable formed in the manner of a semi-rigid cable for use as a transcontinental telephone cable having a corrugated outer conductor formed as an inherently rigid self-supporting tube which encloses an air space to the inner conductor.
  • the outer conductor is multi-layered for cost reasons with a thick steel band and a thin copper band.
  • the ribbed tubular outer conductor has a longitudinal soldering seam.
  • the shield is formed from a longitudinally folded screen foil, which in turn is helically surrounded by ground wires.
  • the screen film itself is two- or three-layered with a plastic carrier film with metal layer applied thereon. This shield construction is relatively expensive to manufacture.
  • From the EP 0 301 859 A is to take a special screen, in which the conductive layer is mounted offset on a support layer, so that the edge part of the conductive layer protrudes beyond the support layer and is folded around this. During wrapping, this folded-over region then comes into surface contact with an end region of the conductive layer in an overlapping region, so that a closed shield layer is formed.
  • the present invention seeks to provide a cost-effective to produce shielded data line with good shielding effect and a method for their preparation.
  • the data line includes a longitudinally extending lead core having at least one conductor surrounded by insulation and surrounded by a multilayer screen foil.
  • the shielding foil is finally surrounded by an outer sheath.
  • the shielding film has a non-conductive layer and a conductive layer, wherein in an overlapping region a free end edge of the shielding film overlaps a further subregion of the shielding film. In the overlapping area, an electrically conductive connection of the conductive layer to the front edge is now formed with the conductive layer in the partial area. The conductive layer is therefore connected at the front edge with the further portion of the conductive layer. As a result, despite the non-conductive layer, a completely circumferential conductive connection is formed within the conductive layer, so that a transverse current flow perpendicular to the longitudinal direction is made possible.
  • the shielding film Due to the multi-layered design of the shielding film, a layer sequence between the conductive layer and the non-conductive layer is given in the case of conventional films in the overlapping region. As a result, interfering high-frequency radiation can occur between the conductive layers due to the non-conductive layer of the screen foil. Due to the configuration with the conductive connection of the free end edge with the other flat partial area, the shielding of the cable is therefore improved compared to a normal overlapping shielding foil.
  • the shielding film is not folded in the overlapping area, ie, in the overlapping area, the ends of the shielding foil lie flat on one another and without folding. In the edge area is therefore no bending or folding the shielding film (by about 180 °) required, which would usually be complicated and thus expensive to implement in the production.
  • This multilayer screen foil is a conventional screen foil having a plastic carrier layer as a non-conductive layer, in particular a PET carrier layer. On this an electrically conductive coating is applied at least on one side. Suitable materials are electrically conductive metals and optionally also electrically conductive carbon compounds. Preferably, a copper layer is used as the conductive layer. Depending on the application, the surface of the copper layer is additionally functionally adapted to desired application conditions of the data line by additional layers, such as tin, silver or even nickel.
  • a three-layered screen film with a central carrier layer is used as the non-conductive layer, on each of which a metallic coating is applied on both sides.
  • a merely two-layered screen foil with a non-conductive layer and a conductive layer can also be used.
  • the individual layers are attached to each other over the entire surface, in particular by a laminating process.
  • the conductive layer therefore covers the non-conductive layer over the entire area and completely.
  • a short-circuit bridge is formed between the front edge and the further subregion. This is formed in particular by a mounted in the region of the front edge conductive strip. This is expediently formed by applying a conductive material by means of a suitable application method, such as, for example, spraying, printing or brushing on. Alternatively, the conductive strip can also be glued on.
  • the outer jacket is applied by means of a (shell) extruder in an extrusion process.
  • this extrusion process is now modified in such a way that the conductive strip is applied immediately before the application of the outer jacket by means of the jacket extruder.
  • a conductive liquid is applied in this case. This has a sufficiently high viscosity that it does not flow off. Additionally or alternatively, it has corresponding fast-drying properties.
  • the applied conductive material is for example a conductive ink, conductive silver or a conductive adhesive.
  • Such methods are used, which allow a continuous order, in particular in the context of a continuous extrusion process.
  • so-called printing wheels are used, the so-called pad printing process or spray and dispensing method used.
  • the conductive strip is applied directly in the extrusion in front of an extrusion head, with the outer jacket is applied in the overlap region.
  • the desired short-circuit bridge is formed by the conductive strip from the front edge to the further flat partial region of the conductive layer.
  • the screen foil itself is modified to form the electrically conductive connection in the overlapping region, specifically such that the conductive layer projects beyond the nonconductive layer at the end edge.
  • a direct contact and thus electrical contact between the projecting portion of the conductive layer and the other portion of the same conductive layer is achieved.
  • the screen foil is beveled at the front edge at an angle. Therefore, in terms of production technology, a conventional, standard-produced film merely needs to be bevelled at an edge region.
  • the oblique front edge is formed for example by a cutting tool, in particular a knife, when cutting the film.
  • the knife is therefore slanted at the desired angle with respect to the film.
  • This angle is - based on a surface normal of the film - preferably more than 30 ° and in particular more than 45 °. Conveniently, the angle is at least 60 °, so that therefore the free end edge is oriented at this angle with respect to one of the surface normals of the screen foil.
  • the chamfering can also be achieved by grinding or scraping initially vertical cutting edges. Improvements in screen attenuation, which are in the range of approximately 5 dB, are to be expected with such oblique front geometries.
  • This method with the beveled on the front edge end foil can be used in principle for all shielded types, ie both for banded shielding foils, which are helically wound around the lead core, as well as for longitudinally applied screen foils, in which the overlap region is parallel to the longitudinal direction.
  • the screen foil is formed as a longitudinally folded film in which the end edge extends parallel to the longitudinal direction.
  • the design is to be preferred in view of high process speeds in the production, as in wound screen films by the winding process is a slowing down of the manufacturing process, which adversely affects the manufacturing cost.
  • the longitudinally folded shielding film and the simultaneous omission of further shield layers, in particular braided shields in addition to the electrically conductive connection on the front edge, the advantages of a tube-like shielding in a semi-rigid cable, with those of a braid shield associated with low production costs.
  • Because of the longitudinally applied film results a closed surface comparable to that of a semi-rigid cable.
  • high flexibility is ensured by the use of a screen foil, which makes the data line suitable for applications with flexural stresses or for applications in which high bending flexibility is desired.
  • the conductive layer of the screen film has a total thickness of preferably less than 50 .mu.m and is in particular in the range of 3 .mu.m to 35 .mu.m. It preferably has a thickness in the range of 20-30 ⁇ m. In principle, thicker conductive layers can also be used, for example up to 100 ⁇ m or up to 200 ⁇ m. However, this increasingly leads to an undesirable stiffening.
  • the thicknesses of the individual layers of the shielding film are usually approximately comparable, wherein often the thickness of the non-conductive plastic carrier layer is greater than the applied by a metal layer conductive layer. The thickness of this metal layer is as mentioned preferably in the range between 20-30 ⁇ m.
  • the total thickness of the shielding film is then preferably about 40 ⁇ m to 80 ⁇ m for a two-layered shielding foil with only one conductive layer and about 50 to 100 ⁇ m for a three-layered shielding foil with two conductive layers.
  • the shielding film is adhesively bonded to the insulation surface, so that therefore the insulation is peripherally completely connected to the shielding film.
  • an adhesive layer is formed, which is formed as an adhesive layer and especially as a hot-melt adhesive layer.
  • this adhesive layer is applied to the screen foil.
  • the adhesive layer is applied to the insulation on the outside. In order to enable this full-surface bonding in terms of manufacturing technology, the adhesive layer is preferably applied during the production process only immediately before the attachment of the screen foil.
  • a heat-activatable hot-melt adhesive layer is applied.
  • This alone by the in the subsequent coat extrusion introduced heat is activated, ie the screen foil is glued to the insulation.
  • the bonding is therefore carried out directly during the extrusion process.
  • the screen foil is reliably fixed in the desired position.
  • Another advantage is the fact that just the overlap point at which the individual portions of the film rest against each other, are fixed together.
  • the electrical contacting of the screen foil with a contact element is not readily possible due to the low rigidity of the screen foil.
  • Conventional contacting operations such as crimping, can not be used.
  • the screen foil is connected to the end of the data line with a contact element in a materially bonded manner, in particular by gluing or soldering, in an electrically conductive manner.
  • the contact element is formed according to a first embodiment as a contact sleeve, in which the end of the data line of the shielding film is inserted. Subsequently, the glued or soldered connection, which in turn is expediently heat activated.
  • a conventional crimp contact element which usually has a cage or receiving area with Crimplaschen.
  • the data line is inserted at the end and then the screen foil is electrically conductively connected in this crimping in particular by soldering.
  • solder or adhesive connection is expediently applied in the manufacturing process at one end of the data line on the outside of the screen film of the conductive adhesive or the solder in particular annular before then the data line is inserted into the contact element and contacted with this electrically.
  • the short-term heating is preferably carried out electrically by a briefly impressed via contacts high current.
  • spatially and temporally delimited effect of heat can be provided in a simple manner.
  • two electrical electrodes for electrical resistance heating are brought to the contact element in the region of the contacting zone / soldering zone.
  • this expedient in order to avoid damage to the insulation during the soldering process, this expediently consists of a heat-resistant material which withstands a temperature of more than 100 ° C. and preferably of more than 150 ° C., at least for the duration of the soldering process.
  • a heat-resistant material which withstands a temperature of more than 100 ° C. and preferably of more than 150 ° C., at least for the duration of the soldering process.
  • the insulation is not damaged by the heat input.
  • the insulation is in particular made of a crosslinked plastic. As insulation massive or foamed insulation can be used.
  • the data line is preferably designed as a coaxial cable, in which the shielding film forms an outer conductor.
  • the data line is therefore formed from the one central conductor, which is surrounded by the insulation acting as a dielectric, which in turn is surrounded directly by the particular all-over glued screen foil as the only screen element. Finally, the outer jacket is applied directly around it.
  • the conductor core comprises a plurality of conductors, each surrounded by a (core) insulation, so it is in particular multi-core.
  • the entire multi-core conductor core is then surrounded by the one common screen foil.
  • the individual wires consist of one conductor each and one of them surrounding core insulation.
  • the shielding film surrounds the composite of the cores, wherein if necessary, the cores can be embedded in a common insulation, then the screen foil is attached.
  • the wires form a composite around which the shielding film is guided directly. Examples of these are the so-called shielded pairs, in which a pair of wires, in particular a pair, is surrounded directly by a screen foil, as is provided, for example, in the case of high-speed data cables. In other constructions, such as a star quad assembly, the special design of the screen foil described here can be used.
  • a data cable can also be constructed from several of the coaxial cables described here.
  • the design of the data line is provided as a coaxial cable.
  • Such a data line is expediently used within a motor vehicle electrical system.
  • the in the Fig.1 shown data line 2 is shown by way of example in the preferred embodiment of a coaxial cable.
  • the data line 2 in this case comprises a central inner conductor 4, which is surrounded by an insulation 6 directly and concentrically.
  • the insulation 6 forms a dielectric.
  • On the insulation 6 is again directly and concentrically mounted a screen foil 8, which constitutes an outer conductor.
  • the shielding foil is then in turn immediately and concentrically surrounded by an outer jacket 10.
  • the screen film 8 is a longitudinally folded screen film 8 which, in the production process, is usually applied longitudinally inwards directly before an extrusion of the outer jacket 10.
  • the screen foil 8 therefore forms an overlapping region 12, which is oriented parallel to a longitudinal direction 14 of the data line 2.
  • the screen film 8 is a multi-layered screen film 8, in the exemplary embodiment a three-layer screen film 8.
  • This has a non-conductive layer 16 as a carrier layer and conductive layers 18a, 18b mounted on both sides.
  • Reference numeral 18a denotes the outwardly directed conductive layer
  • reference numeral 18b denotes the inwardly directed conductive layer.
  • the screen film 8 is a laminated film, in which metal layers for forming the conductive layers 18a, 18b are applied to the carrier layer 16 on both sides in particular.
  • the conductive layers 18a, 18b extend over the entire surface of the non-conductive layer 16.
  • the screen film 8 has a total thickness d, which is preferably ⁇ 60 microns.
  • the two conductive layers 18a, 18b have, for example, a thickness in the range of 20 to 30 .mu.m and the rest is attributable to the non-conductive layer 16 of the carrier layer.
  • two longitudinal edge regions of the screen foil 8 overlap one another in the overlapping region 12, without the screen foil 8 being folded over in the region of one of the longitudinal edges.
  • the screen foil 8 has an end edge 20 in each case.
  • an electrically conductive connection of one of the two conductive layers 18a, 18b to the front edge 20 is now formed with a planar further partial region 22 of the same layer 18a, 18b in the overlapping region 12.
  • the front edge 20, in particular that of the lower longitudinal edge of the screen foil 8, is beveled, so that a preferably acute angle ⁇ is formed.
  • the end edge 20 is oriented with respect to a surface normal 26 at the angle ⁇ , which is preferably> 45 ° and in particular> 60 °.
  • the variants of the Fig. 2 and 3 also combine with each other, ie in addition to the conductive strip 24 is still the beveled end edge 20 is formed.
  • an adhesive layer 28 is further formed, which is disposed between the insulation 6 and the innermost layer 18b of the screen film 8.
  • the adhesive layer 28 is, for example, a hot-melt adhesive layer which is applied to the lower conductive layer 18b immediately before the attachment of the screen foil 8 thereto.
  • the special advantage is achieved that the two longitudinal edges of the shielding film 8 are fixed to one another in the overlap region 12 via the adhesive layer 28.
  • the outer shell 10 is applied by means of an extrusion process.
  • a so-called jacket extruder is used.
  • the shield foil 8 is fed in lengthwise to the jacket extruder.
  • an application device for example a nozzle, etc., is arranged in front of the extrusion head for the outer jacket 10, by means of which the conductive strip 24 is applied in the region of the front edge 20.
  • the heat introduced during the extrusion of the outer jacket 10 activates the hot-melt adhesive of the adhesive layer 28 and thereby forms the adhesive bond between the insulation 6 and the screen foil 8.
  • the beveled end edge 20 in the embodiment of the Fig. 3 is preferably formed by means of a cutting process.
  • a conventionally prepared shielding film 8 is cut, for example, with the aid of an inclined blade.
  • a conventionally prepared visor foil 8 with vertical cut edges is beveled at the cut edges, for example by scraping.
  • the contacting of the screen foil 8 with a contact element 30 is exemplary in the Fig. 4 shown.
  • the contact element 30 is preferably designed as a ring-shaped or cylindrical contact sleeve.
  • the data line 2 is inserted into the contact element 30 with a front end freed from the outer jacket 10.
  • an annular strip of a solder paste 32 is attached to the screen foil 8.
  • the electrical contact connection is made with the contact element 30.
  • the contact connection is therefore pressure-free and cohesive.
  • an electrical current in the area of the solder paste 32 is expediently supplied with the aid of two electrodes 34 so that the solder paste 32 melts and the desired permanently electrically conductive connection is formed.
  • a conductive adhesive can also be used.
  • the contact element 30 is a crimping region of a conventional plug-in contact element.
  • a crimping area usually forms a cage for receiving the line to be contacted. This is usually formed by Crimplaschen that protrude and bent during a normal crimping process.
  • crimping which are usually formed as sheet metal stamped parts, is dispensed with the use of the present data line 2 on the crimping and only the to Fig. 4 designed cohesive connection formed.
  • the contact element 30 is generally part of a plug contact.
  • the data line 2 described here is used in particular in a vehicle electrical system of a motor vehicle.
  • a particularly cost-effective production is achieved with good shielding effect.

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  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)

Description

Die Erfindung betrifft eine Datenleitung mit den Merkmalen des Oberbegriffs des Anspruchs 1, insbesondere für den Einsatz in einem Kraftfahrzeug sowie ein Verfahren zur Herstellung einer solchen Datenleitung.The invention relates to a data line with the features of the preamble of claim 1, in particular for use in a motor vehicle and a method for producing such a data line.

Eine derartige als Koaxialkabel ausgebildete Datenleitung ist beispielsweise aus der US 7,084,343 B1 zu entnehmen. Das darin beschriebene Koaxialkabel weist einen zentralen Innenleiter, eine diesen als Dielektrikum umgebende Isolierung, eine mehrschichtige Schirmung als Außenleiter sowie einen Außenmantel auf. Die mehrschichtige Schirmung ist dabei gebildet aus einer längsgefalteten Schirmfolie sowie einem darüber angebrachten Schirmgeflecht. Durch diesen Aufbau ist das Koaxialkabel vergleichsweise steif. Alternativ zu der mehrschichtigen Schirmung ist diese nach Art eines Wellrohres ausgebildet, wie dies bei den sogenannten Semi-rigid-Kabeln bekannt ist.Such designed as a coaxial cable data line is for example from the US Pat. No. 7,084,343 B1 refer to. The coaxial cable described therein has a central inner conductor, an insulation surrounding this as a dielectric, a multi-layered shielding as an outer conductor and an outer sheath. The multi-layered shield is formed from a longitudinally folded screen foil and a screen braid mounted above it. By this construction, the coaxial cable is comparatively stiff. As an alternative to the multi-layer shielding, this is designed in the manner of a corrugated pipe, as is known in the case of the so-called semi-rigid cables.

Durch die hohe Steifigkeit ist ein solches Kabel nur bedingt in Bereichen mit Wechselbiegebeanspruchungen einsetzbar. Auch ist der Einsatz in Kraftfahrzeugen aufgrund der Steifheit häufig nicht zweckmäßig.Due to the high rigidity of such a cable is only partially used in areas with alternating bending stresses. Also, the use in motor vehicles is often not appropriate due to the stiffness.

Auch ist ein derartiges Kabel aus Kostengründen weniger für die Verwendung im Kraftfahrzeugbereich geeignet, insbesondere auch wegen des mehrschichtigen Schirmaufbaus. Einer der größten Kosten- und Zeitfaktoren stellt nämlich die Ausbildung der Schirmung dar. Er dient technisch dazu, von den im Inneren der Koaxialleitung eingeschlossenen Signalen störende Einstrahlung fern zu halten sowie auch zur Bündelung und Führung eines sich ausbreitenden Feldes. Dazu ist die Schirmung üblicherweise aus einem Geflecht, seltener auch aus einem Wendelschirm oder einem Folienschirm gefertigt. In einer Reihe von Leitungen gibt es auch Kombinationen von verschiedenen Schirmaufbauten. Bei einem Geflechtschirm lassen sich bei der Herstellung nur langsame Geschwindigkeiten rearealisieren, die zu einem sehr großen Maschinenpark an Flechtautomaten führen, der naturgemäß viel Personal, Platz und Energie benötigt.Also, such a cable is less suitable for use in the automotive sector for cost reasons, especially because of the multi-layer shield structure. One of the biggest cost and time factors is namely the formation of the shield. It is technically used to keep away from the trapped inside the coaxial line disturbing radiation and also for bundling and guiding a propagating field. For this purpose, the shielding is usually made of a braid, more rarely also of a helical shield or a foil screen. In a number of lines, there are also combinations of different umbrella structures. With a braid shield, only slow velocities can be rearranged during production, which lead to a very large machine park on braided machines, which naturally requires a lot of staff, space and energy.

Bei den Semi-rigid-Kabel handelt es sich um Koaxialleitungen, deren Außenleiter aus einer geschlossenen Röhre besteht. Diese Leitungen weisen hervorragende elektrische Eigenschaften auf, sind jedoch schwer herzustellen, teuer und nahezu unflexibel.Semi-rigid cables are coaxial cables whose outer conductor consists of a closed tube. These lines have excellent electrical properties but are difficult to manufacture, expensive and almost inflexible.

Aus der GB 1 168 479 A ist ein nach Art eines Semi-rigid-Kabel ausgebildetes Koaxialkabel zur Verwendung als transkontinentales Telefonkabel zu entnehmen, welches einen gerippten als eigensteife selbstragende Röhre ausgebildeten Außenleiter aufweist, der zum Innenleiter einen Luftraum einschließt. Der Außenleiter ist aus Kostengründen mehrlagig mit einem dicken Stahlband sowie mit einem dünnen Kupferband ausgebildet. Der gerippte röhrenförmige Außenleiter weist eine längsverlaufende Lötnaht auf.From the GB 1 168 479 A there is shown a coaxial cable formed in the manner of a semi-rigid cable for use as a transcontinental telephone cable having a corrugated outer conductor formed as an inherently rigid self-supporting tube which encloses an air space to the inner conductor. The outer conductor is multi-layered for cost reasons with a thick steel band and a thin copper band. The ribbed tubular outer conductor has a longitudinal soldering seam.

Ein weiteres Koaxialkabel ist aus der US 3,927,247 zu entnehmen. Bei diesem ist die Schirmung gebildet aus einer längsgefalteten Schirmfolie, welche wiederum helixförmig von Erdungsdrähten umgeben ist. Die Schirmfolie selbst ist zwei- oder dreilagig mit einer Kunststoff-Trägerfolie mit darauf aufgebrachter Metallschicht ausgebildet. Auch dieser Schirmaufbau ist in der Herstellung vergleichsweise teuer.Another coaxial cable is out of the US 3,927,247 refer to. In this case, the shield is formed from a longitudinally folded screen foil, which in turn is helically surrounded by ground wires. The screen film itself is two- or three-layered with a plastic carrier film with metal layer applied thereon. This shield construction is relatively expensive to manufacture.

Neben den Koaxialleitungen sind auch Highspeed-Datenleitungen bekannt, bei denen üblicherweise ein Adernpaar von einer Paarschirmung umgeben ist. Bei diesen Highspeed-Datenleitungen werden üblicherweise ebenfalls mehrlagige Schirmfolien zur Abschirmung verwendet. Aus der DE 10 2008 019 968 A1 ist ein Beispiel für ein derartiges Datenübertragungskabel mit einem von einer Paarschirmung umgebenen Adernpaar zu entnehmen. Die Schirmfolie ist auch hier längsgefaltet, wobei das eine Folienende in einem Überlappbereich zusätzlich gefaltet ist, so dass eine leitfähige Schicht nach außen hin zu einem Beilauf- oder Erdungsdraht orientiert ist, so dass eine elektrische Verbindung zum Erdungsdraht ausgebildet ist. Derartige Highspeed-Datenkabel werden für sehr hohe Übertra gungsfrequenzen bis hin in den Gigahertz-Bereich eingesetzt, sind jedoch in der Herstellung vergleichsweise teuer.In addition to the coaxial lines and high-speed data lines are known in which usually a pair of wires is surrounded by a pair shield. With these high-speed data lines, multi-layered screen films are usually also used for shielding. From the DE 10 2008 019 968 A1 An example of such a data transmission cable with a pair of wires surrounded by a pair shield is shown. The shielding foil is also longitudinally folded, wherein the one foil end is additionally folded in an overlap region, so that a conductive layer is oriented outwards to form a bypass or grounding wire, so that an electrical connection to the grounding wire is formed. Such high-speed data cables are for very high Übertra Frequencies are used in the gigahertz range, but are relatively expensive to manufacture.

Aus der EP 0 301 859 A ist eine spezielle Schirmfolie zu entnehmen, bei der die leitfähige Lage versetzt auf einer Trägerschicht angebracht ist, so dass randseitig ein Teil der leitfähigen Lage über die Trägerschicht übersteht und um diese gefaltet wird. Beim Umwickeln kommt dieser umgefaltete Bereich dann mit einem Endbereich der leitfähigen Lage in einem Überlappbereich flächig in Kontakt, so dass eine geschlossene Schirmlage ausgebildet ist.From the EP 0 301 859 A is to take a special screen, in which the conductive layer is mounted offset on a support layer, so that the edge part of the conductive layer protrudes beyond the support layer and is folded around this. During wrapping, this folded-over region then comes into surface contact with an end region of the conductive layer in an overlapping region, so that a closed shield layer is formed.

Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, eine kostengünstig herzustellende geschirmte Datenleitung mit guter Schirmwirkung sowie ein Verfahren zu deren Herstellung anzugeben.Proceeding from this, the present invention seeks to provide a cost-effective to produce shielded data line with good shielding effect and a method for their preparation.

Die Aufgabe wird erfindungsgemäß gelöst durch eine Datenleitung mit den Merkmalen des Anspruches 1 sowie durch ein Verfahren mit den Merkmalen des Anspruches 14. Bevorzugte Weiterbildungen sind in den Unteransprüchen enthalten. Die im Hinblick auf die Datenleitung angeführten Vorteile und bevorzugten Ausgestaltungen sind sinngemäß auch auf das Verfahren zu übertragen.The object is achieved by a data line with the features of claim 1 and by a method having the features of claim 14. Preferred developments are contained in the subclaims. The advantages and preferred embodiments cited with regard to the data line are also to be transferred analogously to the method.

Die Datenleitung umfasst einen sich in einer Längsrichtung erstreckenden Leitungskern, der zumindest einen von einer Isolierung umgebenen Leiter aufweist und der von einer mehrlagigen Schirmfolie umgeben ist. Die Schirmfolie ist schließlich noch von einem Außenmantel umgeben. In der bevorzugten Ausgestaltung unmittelbar ohne weitere Zwischenlagen. Die Schirmfolie weist eine nicht leitende Lage und eine leitfähige Lage auf, wobei in einem Überlappungsbereich eine freie Stirnkante der Schirmfolie einen weiteren Teilbereich der Schirmfolie überlappt. Im Überlappungsbereich ist nunmehr eine elektrisch leitende Verbindung der leitfähigen Lage an der Stirnkante mit der leitfähigen Lage im Teilbereich ausgebildet. Die leitfähige Lage wird daher an der Stirnkante stirnseitig mit dem weiteren Teilbereich der leitfähigen Lage verbunden. Dadurch ist trotz der nicht leitenden Lage eine vollständig umlaufend leitende Verbindung innerhalb der leitenden Lage ausgebildet, so dass ein transversaler Stromfluss senkrecht zur Längsrichtung ermöglicht ist.The data line includes a longitudinally extending lead core having at least one conductor surrounded by insulation and surrounded by a multilayer screen foil. The shielding foil is finally surrounded by an outer sheath. In the preferred embodiment immediately without further intermediate layers. The shielding film has a non-conductive layer and a conductive layer, wherein in an overlapping region a free end edge of the shielding film overlaps a further subregion of the shielding film. In the overlapping area, an electrically conductive connection of the conductive layer to the front edge is now formed with the conductive layer in the partial area. The conductive layer is therefore connected at the front edge with the further portion of the conductive layer. As a result, despite the non-conductive layer, a completely circumferential conductive connection is formed within the conductive layer, so that a transverse current flow perpendicular to the longitudinal direction is made possible.

Aufgrund der mehrlagigen Ausbildung der Schirmfolie ist bei herkömmlichen Folien im Überlappungsbereich eine Schichtfolge zwischen der leitfähigen Lage und der nicht leitenden Lage gegeben. Dies führt dazu, dass eine störende Hochfrequenzstrahlung zwischen den leitfähigen Lagen durch die nicht leitende Lage der Schirmfolie einfallen kann. Durch die Ausgestaltung mit der leitenden Verbindung der freien Stirnkante mit dem weiteren flächigen Teilbereich wird daher die Schirmung des Kabels gegenüber einer normalen überlappenden Schirmfolie verbessert.Due to the multi-layered design of the shielding film, a layer sequence between the conductive layer and the non-conductive layer is given in the case of conventional films in the overlapping region. As a result, interfering high-frequency radiation can occur between the conductive layers due to the non-conductive layer of the screen foil. Due to the configuration with the conductive connection of the free end edge with the other flat partial area, the shielding of the cable is therefore improved compared to a normal overlapping shielding foil.

Zweckdienlicherweise ist dabei die Schirmfolie im Überlappungsbereich nicht gefaltet, d.h. im Überlappungsbereich liegen die Enden der Schirmfolie flächig und faltungsfrei aufeinander. Im Kantenbereich ist daher kein Umbiegen oder Umfalten der Schirmfolie (um etwa 180°) erforderlich, welches bei der Herstellung üblicherweise aufwendig und damit teuer umzusetzen wäre.Conveniently, the shielding film is not folded in the overlapping area, ie, in the overlapping area, the ends of the shielding foil lie flat on one another and without folding. In the edge area is therefore no bending or folding the shielding film (by about 180 °) required, which would usually be complicated and thus expensive to implement in the production.

Im Hinblick auf eine möglichst kostengünstige und einfache Ausgestaltung ist weiterhin auf ein weiteres Schirmelement verzichtet. Es handelt sich daher um eine rein foliengeschirmte Datenleitung, bei der als das einzige Schirmelement die eine mehrlagige Schirmfolie vorgesehen ist.With regard to the most cost-effective and simple design is further dispensed with a further screen element. It is therefore a purely foil-shielded data line, in which as the only screen element which is provided a multi-layered screen foil.

Bei dieser mehrlagigen Schirmfolie handelt es sich um eine übliche Schirmfolie mit einer Kunststoff-Trägerschicht als nicht leitende Lage, insbesondere eine PET-Trägerschicht. Auf diese ist zumindest auf einer Seite eine elektrisch leitfähige Beschichtung aufgebracht. Als Material kommen elektrisch leitfähige Metalle und gegebenenfalls auch elektrisch leitfähige Kohlenstoffverbindungen in Betracht. Vorzugsweise wird eine Kupferschicht als leitfähige Lage verwendet. Die Oberfläche der Kupferschicht ist je nach Anwendungsfall ergänzend funktional durch zusätzliche Schichten, wie Zinn, Silber oder auch Nickel an gewünschte Anwendungsbedingungen der Datenleitung angepasst.This multilayer screen foil is a conventional screen foil having a plastic carrier layer as a non-conductive layer, in particular a PET carrier layer. On this an electrically conductive coating is applied at least on one side. Suitable materials are electrically conductive metals and optionally also electrically conductive carbon compounds. Preferably, a copper layer is used as the conductive layer. Depending on the application, the surface of the copper layer is additionally functionally adapted to desired application conditions of the data line by additional layers, such as tin, silver or even nickel.

Vorzugsweise wird dabei eine dreilagige Schirmfolie mit einer mittleren Trägerschicht als nicht leitende Lage verwendet, auf der beidseitig jeweils eine metallische Beschichtung aufgebracht ist. Alternativ kann auch eine lediglich zweilagige Schirmfolie mit einer nicht leitenden Lage und einer leitfähigen Lage verwendet werden. Die einzelnen Lagen sind dabei aneinander jeweils vollflächig angebracht, insbesondere durch einen Kaschiervorgang. Die leitfähige Lage bedeckt daher die nicht leitende Lage vollflächig und vollständig.Preferably, a three-layered screen film with a central carrier layer is used as the non-conductive layer, on each of which a metallic coating is applied on both sides. Alternatively, a merely two-layered screen foil with a non-conductive layer and a conductive layer can also be used. The individual layers are attached to each other over the entire surface, in particular by a laminating process. The conductive layer therefore covers the non-conductive layer over the entire area and completely.

In zweckdienlicher Ausgestaltung ist dabei zwischen der Stirnkante und dem weiteren Teilbereich eine Kurzschlussbrücke ausgebildet. Diese ist insbesondere durch einen im Bereich der Stirnkante angebrachten leitfähigen Streifen gebildet. Dieser ist zweckdienlicherweise durch Auftragen eines leitfähigen Materials mittels eines geeigneten Auftragsverfahrens, wie beispielsweise Aufspritzen, Aufdrucken oder Aufstreichen ausgebildet. Alternativ kann der leitfähige Streifen auch aufgeklebt werden.In an expedient refinement, a short-circuit bridge is formed between the front edge and the further subregion. This is formed in particular by a mounted in the region of the front edge conductive strip. This is expediently formed by applying a conductive material by means of a suitable application method, such as, for example, spraying, printing or brushing on. Alternatively, the conductive strip can also be glued on.

Bei derartigen Datenleitungen wird der Außenmantel mit Hilfe eines (Mantel-) Extruders in einem Extrusionsprozess aufgebracht. Zum Aufbringen des leitfähigen Streifens wird dieser Extrusionsprozess nunmehr derart modifiziert, dass unmittelbar vor dem Aufbringen des Außenmantels mittels des Mantelextruders der leitfähige Streifen aufgebracht wird. Dies lässt sich prozesstechnisch ohne Einbußen der Prozessgeschwindigkeit durch die angesprochenen Auftragsverfahren erreichen. Insbesondere wird hierbei eine leitfähige Flüssigkeit aufgebracht. Diese weist dabei eine ausreichend hohe Viskosität auf, dass sie nicht abfließt. Ergänzend oder alternativ besitzt sie entsprechende schnell trocknende Eigenschaften. Das aufgebrachte leitfähige Material ist beispielsweise eine leitfähige Druckfarbe, Leitsilber oder auch ein Leitkleber. Als Auftragsverfahren werden dabei derartige Verfahren verwendet, die einen kontinuierlichen Auftrag insbesondere im Rahmen eines kontinuierlichen Extrusionsverfahrens ermöglichen. Hierzu werden beispielsweise sogenannte Druckräder verwendet, das sogenannte Tampondruck-Verfahren oder auch Sprüh- und Dispenserverfahren eingesetzt. Der leitfähige Streifen wird direkt bei der Extrusion vor einem Extrusionskopf, mit dem der Außenmantel aufgebracht wird, im Überlappungsbereich aufgebracht. Durch den leitfähigen Streifen wird die gewünschte Kurzschlussbrücke von der Stirnkante zu dem weiteren flächigen Teilbereich der leitfähigen Lage ausgebildet.In such data lines, the outer jacket is applied by means of a (shell) extruder in an extrusion process. For the application of the conductive strip, this extrusion process is now modified in such a way that the conductive strip is applied immediately before the application of the outer jacket by means of the jacket extruder. In terms of process technology, this can be achieved without sacrificing process speed through the mentioned application methods. In particular, a conductive liquid is applied in this case. This has a sufficiently high viscosity that it does not flow off. Additionally or alternatively, it has corresponding fast-drying properties. The applied conductive material is for example a conductive ink, conductive silver or a conductive adhesive. As a method of application, such methods are used, which allow a continuous order, in particular in the context of a continuous extrusion process. For this purpose, for example, so-called printing wheels are used, the so-called pad printing process or spray and dispensing method used. The conductive strip is applied directly in the extrusion in front of an extrusion head, with the outer jacket is applied in the overlap region. The desired short-circuit bridge is formed by the conductive strip from the front edge to the further flat partial region of the conductive layer.

Alternativ oder ergänzend zu der Aufbringung eines leitfähigen Streifens ist zur Ausbildung der elektrisch leitenden Verbindung im Überlappungsbereich die Schirmfolie selbst modifiziert und zwar derart, dass an der Stirnkante die leitfähige Lage über die nicht leitende Lage übersteht. Dadurch ist eine direkte Berührung und damit elektrische Kontaktierung zwischen dem überstehenden Teilbereich der leitfähigen Lage und dem weiteren Teilbereich derselben leitfähigen Lage erzielt.As an alternative or in addition to the application of a conductive strip, the screen foil itself is modified to form the electrically conductive connection in the overlapping region, specifically such that the conductive layer projects beyond the nonconductive layer at the end edge. As a result, a direct contact and thus electrical contact between the projecting portion of the conductive layer and the other portion of the same conductive layer is achieved.

Um dies in besonders kostengünstiger und herstellungstechnisch einfacher Weise zu ermöglichen, ist dabei die Schirmfolie an der Stirnkante unter einem Winkel abgeschrägt. Herstellungstechnisch braucht daher eine übliche, standardmäßig hergestellte Folie an einem Randbereich lediglich abgeschrägt zu werden. Hierzu wird die schräge Stirnkante beispielsweise durch ein Schneidwerkzeug, insbesondere ein Messer, beim Zuschneiden der Folie ausgebildet. Das Messer wird daher bezüglich der Folie unter dem gewünschten Winkel schräg angestellt. Dieser Winkel beträgt - bezogen auf eine Flächennormale der Folie - vorzugsweise mehr als 30° und insbesondere mehr als 45°. Zweckdienlicherweise beträgt der Winkel dabei zumindest 60°, so dass also die freie Stirnkante unter diesem Winkel bezüglich einer der Flächennormalen der Schirmfolie orientiert ist. Insgesamt wird durch eine vergleichsweise flach auslaufende Stirnkante, also durch einen großen Winkel gewährleistet, dass an der Stirnseite die leitfähige Lage mit sich selbst kontaktiert wird. Im Überlappungsbereich schmiegt sich daher der weitere Teilbereich quasi "flächig" an die abgeschrägte Stirnkante an.In order to make this possible in a particularly cost-effective and production-technically simple manner, the screen foil is beveled at the front edge at an angle. Therefore, in terms of production technology, a conventional, standard-produced film merely needs to be bevelled at an edge region. For this purpose, the oblique front edge is formed for example by a cutting tool, in particular a knife, when cutting the film. The knife is therefore slanted at the desired angle with respect to the film. This angle is - based on a surface normal of the film - preferably more than 30 ° and in particular more than 45 °. Conveniently, the angle is at least 60 °, so that therefore the free end edge is oriented at this angle with respect to one of the surface normals of the screen foil. Overall, it is ensured by a comparatively flat expiring front edge, ie by a large angle, that at the front side, the conductive layer is contacted with itself. In the overlapping area, therefore, the further partial area nestles virtually "flatly" against the bevelled front edge.

Alternativ zu einem Schneiden der Folie zur Ausbildung der gewünschten Schräge kann die Abschrägung auch durch ein Schleifen oder Schaben von zunächst senkrechten Schnittkanten erzielt werden. Mit derartig schrägen Stirngeometrien sind Verbesserungen in der Schirmdämpfung zu erwarten, die sich im Bereich von ca. 5 dB bewegen.As an alternative to cutting the film to form the desired slope, the chamfering can also be achieved by grinding or scraping initially vertical cutting edges. Improvements in screen attenuation, which are in the range of approximately 5 dB, are to be expected with such oblique front geometries.

Dieses Verfahren mit der an der Stirnkante abgeschrägten Stirnfolie lässt sich grundsätzlich bei allen geschirmten Typen einsetzen, also sowohl für bandierte Schirmfolien, die helixförmig um den Leitungskern gewickelt sind, als auch für längs laufend aufgebrachte Schirmfolien, bei denen der Überlappungsbereich parallel zur Längsrichtung verläuft.This method with the beveled on the front edge end foil can be used in principle for all shielded types, ie both for banded shielding foils, which are helically wound around the lead core, as well as for longitudinally applied screen foils, in which the overlap region is parallel to the longitudinal direction.

Zweckdienlicherweise wird die Schirmfolie jedoch als eine längs gefaltete Folie ausgebildet, bei der die Stirnkante parallel zur Längsrichtung verläuft. Die Ausgestaltung ist im Hinblick auf hohe Prozessgeschwindigkeiten bei der Herstellung zu bevorzugen, da bei gewickelten Schirmfolien durch den Wicklungsvorgang eine Verlangsamung des Herstellungsprozesses erfolgt, was sich nachteilig auf die Herstellungskosten auswirkt. Insgesamt sind daher mit der längs gefalteten Schirmfolie und dem gleichzeitigen Verzicht auf weitere Schirmlagen, insbesondere Geflechtschirme, in Ergänzung mit der elektrisch leitenden Verbindung an der Stirnkante die Vorteile einer nach Art einer Röhre ausgebildeten Schirmung bei einem Semi-rigid-Kabel, mit denen eines Geflechtschirms bei geringen Herstellungskosten verbunden. Wegen der längslaufend aufgebrachten Folie ergibt sich eine geschlossene Oberfläche, die vergleichbar zu der eines Semi-rigid-Kabels ist. Gleichzeitig ist durch die Verwendung einer Schirmfolie eine hohe Flexibilität gewährleistet, welche die Datenleitung für Anwendungen mit Biegewechselbeanspruchungen oder auch für solche Anwendungen geeignet macht, bei denen eine hohe Biegeflexibilität gewünscht ist.Conveniently, however, the screen foil is formed as a longitudinally folded film in which the end edge extends parallel to the longitudinal direction. The design is to be preferred in view of high process speeds in the production, as in wound screen films by the winding process is a slowing down of the manufacturing process, which adversely affects the manufacturing cost. Overall, therefore, with the longitudinally folded shielding film and the simultaneous omission of further shield layers, in particular braided shields, in addition to the electrically conductive connection on the front edge, the advantages of a tube-like shielding in a semi-rigid cable, with those of a braid shield associated with low production costs. Because of the longitudinally applied film results a closed surface comparable to that of a semi-rigid cable. At the same time, high flexibility is ensured by the use of a screen foil, which makes the data line suitable for applications with flexural stresses or for applications in which high bending flexibility is desired.

Um diese hohe Flexibilität zu gewährleisten weist die leitende Lage der Schirmfolie dabei insgesamt eine Dicke von vorzugsweise kleiner 50µm auf und liegt insbesondere im Bereich von 3 µm bis 35 µm. Bevorzugt weist sie dabei eine Dicke im Bereich von 20-30µm auf. Grundsätzlich können auch dickere leitfähige Lagen beispielsweise bis 100µm oder bis 200µm eingesetzt werden. Dies führt jedoch zunehmend zu einer unerwünschten Versteifung. Die Dicken der einzelnen Lagen der Schirmfolie sind üblicherweise in etwa vergleichbar, wobei häufig die Dicke der nicht leitfähigen Kunststoff-Trägerschicht größer ist als die durch eine Metallschicht aufgebrachte leitfähige Lage. Die Dicke dieser Metallschicht liegt wie erwähnt bevorzugt im Bereich zwischen 20-30µm. Die Gesamtdicke der Schirmfolie liegt dann vorzugsweise bei einer zweilagigen Schirmfolie mit nur einer leitfähigen Lage bei etwa 40µm bis 80µm und bei einer dreilagigen Schirmfolie mit zwei leitfähigen Lagen bei etwa 50 bis 100 µm.In order to ensure this high flexibility, the conductive layer of the screen film has a total thickness of preferably less than 50 .mu.m and is in particular in the range of 3 .mu.m to 35 .mu.m. It preferably has a thickness in the range of 20-30μm. In principle, thicker conductive layers can also be used, for example up to 100 μm or up to 200 μm. However, this increasingly leads to an undesirable stiffening. The thicknesses of the individual layers of the shielding film are usually approximately comparable, wherein often the thickness of the non-conductive plastic carrier layer is greater than the applied by a metal layer conductive layer. The thickness of this metal layer is as mentioned preferably in the range between 20-30μm. The total thickness of the shielding film is then preferably about 40 μm to 80 μm for a two-layered shielding foil with only one conductive layer and about 50 to 100 μm for a three-layered shielding foil with two conductive layers.

Insbesondere bei biegeflexiblen Leitungen ist für eine zuverlässige Schirmung ein Faltenwurf der Schirmfolie bei einer Biegung möglichst zu vermeiden. Um dies zu erreichen ist die Schirmfolie in bevorzugter Ausgestaltung mit der Isolierung flächig verklebt, so dass also die Isolierung umfangsseitig vollständig mit der Schirmfolie verbunden ist. Hierzu ist insbesondere eine Haftschicht ausgebildet, die als eine Klebeschicht und speziell als eine Heißkleberschicht ausgebildet ist. Gemäß einer ersten Ausführungsvariante ist diese Haftschicht auf die Schirmfolie augebracht. In einer alternativen Ausführungsvariante ist die Haftschicht auf die Isolierung außen aufgebracht. Um herstellungstechnisch dieses vollflächige Verkleben zu ermöglichen, wird die Haftschicht beim Herstellungsprozess bevorzugt erst unmittelbar vor dem Anbringen der Schirmfolie aufgebracht. Hierzu wird insbesondere eine hitzeaktivierbare Heißklebeschicht aufgebracht. Der besondere Vorteil besteht darin, dass diese allein durch die bei der nachfolgenden Mantelextrusion eingebrachte Wärme aktiviert wird, d.h. die Schirmfolie wird mit der Isolierung verklebt. Bei der Verwendung einer derartigen Heißkleberschicht wird die Verklebung daher unmittelbar beim Extrusionsvorgang durchgeführt. Nach der Abkühlung ist die Schirmfolie in der gewünschten Position zuverlässig fixiert. Durch diese Maßnahme wird der kontinuierliche Herstellungsprozess nicht gestört und zudem werden zuverlässig Falten bei einer Biegung der Datenleitung vermieden, welche bei HF-Signalen störend wären.In particular, in flexurally flexible lines, a drape of the shielding foil is to be avoided as far as possible during bending for reliable shielding. In order to achieve this, in a preferred embodiment, the shielding film is adhesively bonded to the insulation surface, so that therefore the insulation is peripherally completely connected to the shielding film. For this purpose, in particular an adhesive layer is formed, which is formed as an adhesive layer and especially as a hot-melt adhesive layer. According to a first embodiment variant, this adhesive layer is applied to the screen foil. In an alternative embodiment variant, the adhesive layer is applied to the insulation on the outside. In order to enable this full-surface bonding in terms of manufacturing technology, the adhesive layer is preferably applied during the production process only immediately before the attachment of the screen foil. For this purpose, in particular a heat-activatable hot-melt adhesive layer is applied. The particular advantage is that this alone by the in the subsequent coat extrusion introduced heat is activated, ie the screen foil is glued to the insulation. When using such a hot melt adhesive layer, the bonding is therefore carried out directly during the extrusion process. After cooling, the screen foil is reliably fixed in the desired position. By this measure, the continuous production process is not disturbed and also reliably folds are avoided in a bend of the data line, which would be annoying for RF signals.

Ein weiterer Vorteil ist darin zu sehen, dass gerade auch die Überlappungsstelle, an der die einzelnen Teilbereiche der Folie aneinander aufliegen, miteinander fixiert sind.Another advantage is the fact that just the overlap point at which the individual portions of the film rest against each other, are fixed together.

Bei einer derartigen rein foliengeschirmten Datenleitung ist die elektrische Kontaktierung der Schirmfolie mit einem Kontaktelement, beispielsweise für das Anschlagen eines Steckers, aufgrund der geringen Steifigkeit der Schirmfolie nicht ohne weiteres möglich. Herkömmliche Kontaktierungsvorgänge, wie beispielsweise Crimpen, lassen sich nicht verwenden. In zweckdienlicher Ausgestaltung wird daher die Schirmfolie endseitig der Datenleitung mit einem Kontaktelement stoffschlüssig insbesondere durch Kleben oder Löten elektrisch leitend verbunden. Das Kontaktelement ist dabei gemäß einer ersten Ausführungsvariante als eine Kontakthülse ausgebildet, in die das Ende der Datenleitung der Schirmfolie eingesteckt wird. Anschließend erfolgt die Kleb- oder Lötverbindung, welche wiederum zweckdienlicherweise hitzeaktiviert ist.In such a purely foil-shielded data line, the electrical contacting of the screen foil with a contact element, for example for striking a plug, is not readily possible due to the low rigidity of the screen foil. Conventional contacting operations, such as crimping, can not be used. In an expedient embodiment, therefore, the screen foil is connected to the end of the data line with a contact element in a materially bonded manner, in particular by gluing or soldering, in an electrically conductive manner. The contact element is formed according to a first embodiment as a contact sleeve, in which the end of the data line of the shielding film is inserted. Subsequently, the glued or soldered connection, which in turn is expediently heat activated.

Gemäß einer alternativen Ausgestaltung wird ein herkömmliches Crimpkontakt-Element verwendet, welches üblicherweise einen Käfig oder Aufnahmebereich mit Crimplaschen aufweist. In diesen Aufnahmebereich wird die Datenleitung endseitig eingelegt und anschließend wird die Schirmfolie in diesem Crimpbereich elektrisch leitend insbesondere durch Löten verbunden.According to an alternative embodiment, a conventional crimp contact element is used, which usually has a cage or receiving area with Crimplaschen. In this recording area, the data line is inserted at the end and then the screen foil is electrically conductively connected in this crimping in particular by soldering.

Zur Ausbildung der Löt- oder Klebeverbindung wird zweckdienlicherweise beim Herstellverfahren an einem Ende der Datenleitung außenseitig auf die Schirmfolie der Leitkleber oder das Lot insbesondere ringförmig aufgebracht wird, bevor dann die Datenleitung in das Kontaktelement eingelegt und mit diesem elektrisch kontaktiert wird.To form the solder or adhesive connection is expediently applied in the manufacturing process at one end of the data line on the outside of the screen film of the conductive adhesive or the solder in particular annular before then the data line is inserted into the contact element and contacted with this electrically.

Zur Ausbildung der Lötverbindung wird dabei kurzzeitig das Kontaktelement lokal erhitzt, so dass die aufgebrachte Lötpaste zum Schmelzen gebracht wird und dabei für eine dauerhafte Lötverbindung zwischen Schirmfolie und Kontaktelement sorgt. Das kurzfristige Erhitzen erfolgt dabei vorzugsweise elektrisch durch einen über Kontakte kurzzeitig aufgeprägten hohen Strom. Dadurch kann in einfacher Weise eine räumlich und zeitlich abgegrenzte Hitzeeinwirkung bereitgestellt werden. Es werden also an das Kontaktelement im Bereich der Kontaktierungszone / Lötzone zwei elektrische Elektroden zur elektrischen Widerstandsbeheizung herangeführt.To form the solder joint while the contact element is briefly heated locally, so that the applied solder paste is melted, thereby ensuring a permanent solder joint between the shielding film and contact element. The short-term heating is preferably carried out electrically by a briefly impressed via contacts high current. As a result, spatially and temporally delimited effect of heat can be provided in a simple manner. Thus, two electrical electrodes for electrical resistance heating are brought to the contact element in the region of the contacting zone / soldering zone.

Um bei dem Lötprozess eine Beschädigung der Isolierung zu vermeiden, besteht diese zweckdienlicherweise aus einem hitzebeständigen Material, welches einer Temperatur von über 100°C und vorzugsweise von über 150°C zumindest kurzfristig für die Zeitdauer des Lötvorgangs standhält. Hierunter wird verstanden, dass die Isolierung nicht durch den Hitzeeintrag beschädigt wird. Im Hinblick auf die gewünschte hitzebeständige Ausgestaltung besteht die Isolierung dabei insbesondere aus einem vernetzten Kunststoff. Als Isolierung können dabei massive oder auch geschäumte Isolierungen zum Einsatz kommen.In order to avoid damage to the insulation during the soldering process, this expediently consists of a heat-resistant material which withstands a temperature of more than 100 ° C. and preferably of more than 150 ° C., at least for the duration of the soldering process. By this is meant that the insulation is not damaged by the heat input. In view of the desired heat-resistant configuration, the insulation is in particular made of a crosslinked plastic. As insulation massive or foamed insulation can be used.

Die Datenleitung ist vorzugsweise als ein Koaxialkabel ausgebildet, bei dem die Schirmfolie einen Außenleiter bildet. Die Datenleitung ist daher gebildet aus dem einen zentralen Leiter, welcher von der als Dielektrikum wirkenden Isolierung umgeben ist, welche wiederum unmittelbar von der insbesondere vollflächig aufgeklebten Schirmfolie als einziges Schirmelement umgeben ist. Um diese herum ist schließlich der Außenmantel unmittelbar aufgebracht.The data line is preferably designed as a coaxial cable, in which the shielding film forms an outer conductor. The data line is therefore formed from the one central conductor, which is surrounded by the insulation acting as a dielectric, which in turn is surrounded directly by the particular all-over glued screen foil as the only screen element. Finally, the outer jacket is applied directly around it.

Alternativ umfasst der Leitungskern mehrere, jeweils von einer (Ader-)Isolierung umgebene Leiter, ist also insbesondere mehradrig ausgebildet. Der gesamte mehradrige Leitungskern ist dann von der einen gemeinsamen Schirmfolie umgeben. Die einzelnen Adern bestehen dabei jeweils aus einem Leiter und einer diesen umgebenden Aderisolierung. Die Schirmfolie umgibt dabei den Verbund der Adern, wobei bei Bedarf die Adern in einer gemeinsamen Isolierung eingebettet sein können, um die dann Schirmfolie angebracht ist. Üblicherweise bilden die Adern jedoch einen Verbund, um den die Schirmfolie direkt geführt ist. Beispiele hierfür sind die sogenannten geschirmten Paare, bei denen also ein insbesondere paarverseiltes Adernpaar unmittelbar von einer Schirmfolie umgeben ist, wie dies beispielsweise bei den Highspeed-Datenkabeln vorgesehen ist. Auch bei anderen Aufbauten, wie beispielsweise einem Sternvierer-Aufbau, kann die spezielle Ausbildung der hier beschriebenen Schirmfolie eingesetzt werden. Insgesamt kann ein Datenkabel auch aus mehreren der hier beschriebenen Koaxialkabel aufgebaut sein.Alternatively, the conductor core comprises a plurality of conductors, each surrounded by a (core) insulation, so it is in particular multi-core. The entire multi-core conductor core is then surrounded by the one common screen foil. The individual wires consist of one conductor each and one of them surrounding core insulation. The shielding film surrounds the composite of the cores, wherein if necessary, the cores can be embedded in a common insulation, then the screen foil is attached. Usually, however, the wires form a composite around which the shielding film is guided directly. Examples of these are the so-called shielded pairs, in which a pair of wires, in particular a pair, is surrounded directly by a screen foil, as is provided, for example, in the case of high-speed data cables. In other constructions, such as a star quad assembly, the special design of the screen foil described here can be used. Overall, a data cable can also be constructed from several of the coaxial cables described here.

Bevorzugt ist jedoch die Ausgestaltung der Datenleitung als ein Koaxialkabel vorgesehen.Preferably, however, the design of the data line is provided as a coaxial cable.

Eine derartige Datenleitung wird zweckdienlicherweise innerhalb eines Kraftfahrzeug-Bordnetzes eingesetzt.Such a data line is expediently used within a motor vehicle electrical system.

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Figuren näher erläutert. Diese zeigen jeweils in vereinfachten Darstellungen:

Fig. 1
eine perspektivische Darstellung eines Koaxialkabels als Datenleitung mit jeweils teilweise freigelegten Komponenten zur besseren Übersicht,
Fig. 2
eine ausschnittsweise Querschnittsdarstellung einer Schirmfolie mit Leitungskern in einem Überlappungsbereich mit einem leitfähigen Streifen zur Ausbildung einer leitfähigen Brücke zwischen einer Stirnkante und einem flächigen Teilbereich der Schirmfolie,
Fig.3
eine ausschnittsweise Querschnittsdarstellung einer Schirmfolie im Überlappungsbereich gemäß einer zweiten Ausführungsvariante mit abgeschrägter Stirnkante, sowie
Fig. 4
eine vereinfachte Querschnittsdarstellung im Endbereich einer Datenleitung mit einem Kontaktelement.
Embodiments of the invention will be explained in more detail with reference to FIGS. These show in simplified representations:
Fig. 1
a perspective view of a coaxial cable as a data line with each partially exposed components for a better overview,
Fig. 2
1 is a fragmentary cross-sectional view of a screen foil with a lead core in an overlapping area with a conductive strip for forming a conductive bridge between a front edge and a planar subarea of the screen foil;
Figure 3
a partial cross-sectional view of a shielding film in the overlapping region according to a second embodiment with beveled end edge, and
Fig. 4
a simplified cross-sectional view in the end of a data line with a contact element.

In den Figuren sind gleich wirkende Teile mit den gleichen Bezugszeichen versehen.In the figures, like-acting parts are provided with the same reference numerals.

Die in der Fig.1 dargestellte Datenleitung 2 ist beispielhaft in der bevorzugten Ausführungsvariante eines Koaxialkabels dargestellt. Die Datenleitung 2 umfasst hierbei einen zentralen Innenleiter 4, welcher von einer Isolierung 6 unmittelbar und konzentrisch umgeben ist. Die Isolierung 6 bildet ein Dielektrikum. Auf die Isolierung 6 ist wiederum unmittelbar und konzentrisch eine Schirmfolie 8 angebracht, die einen Außenleiter darstellt. Die Schirmfolie ist anschließend wiederum unmittelbar und konzentrisch von einem Außenmantel 10 umgeben.The in the Fig.1 shown data line 2 is shown by way of example in the preferred embodiment of a coaxial cable. The data line 2 in this case comprises a central inner conductor 4, which is surrounded by an insulation 6 directly and concentrically. The insulation 6 forms a dielectric. On the insulation 6 is again directly and concentrically mounted a screen foil 8, which constitutes an outer conductor. The shielding foil is then in turn immediately and concentrically surrounded by an outer jacket 10.

Bei der Schirmfolie 8 handelt es sich um eine längsgefaltete Schirmfolie 8, welche beim Herstellverfahren längs einlaufend üblicherweise unmittelbar vor einer Extrusion des Außenmantels 10 aufgebracht wird. Die Schirmfolie 8 bildet daher einen Überlappungsbereich 12 aus, welcher parallel zu einer Längsrichtung 14 der Datenleitung 2 orientiert ist.The screen film 8 is a longitudinally folded screen film 8 which, in the production process, is usually applied longitudinally inwards directly before an extrusion of the outer jacket 10. The screen foil 8 therefore forms an overlapping region 12, which is oriented parallel to a longitudinal direction 14 of the data line 2.

Wie insbesondere aus den Fig. 2 und 3 hervorgeht, handelt es sich bei der Schirmfolie 8 um eine mehrlagige Schirmfolie 8, im Ausführungsbeispiel eine dreilagige Schirmfolie 8. Diese weist als Trägerschicht eine nicht leitende Lage 16 sowie beidseitig auf dieser angebrachte leitfähige Lagen 18a,18b auf. Mit Bezugsziffer 18a ist dabei die nach außen gerichtete leitfähige Lage und mit Bezugsziffer 18b die nach innen gerichtete leitfähige Lage bezeichnet. Bei der Schirmfolie 8 handelt es sich insbesondere um eine kaschierte Folie, bei der also auf die Trägerschicht 16 beidseitig insbesondere Metallschichten zur Ausbildung der leitfähigen Lagen 18a,18b aufgebracht sind. Die leitfähigen Lagen 18a,18b erstrecken sich dabei über die gesamt Fläche der nicht leitfähigen Lage 16. Die Schirmfolie 8 weist insgesamt eine Dicke d auf, die vorzugsweise <60 µm ist. Die beiden leitfähigen Lagen 18a,18b weisen dabei beispielsweise eine Dicke im Bereich von 20 bis 30 µm auf und der Rest entfällt auf die nicht leitende Lage 16 der Trägerschicht.As in particular from the Fig. 2 and 3 It is apparent that the screen film 8 is a multi-layered screen film 8, in the exemplary embodiment a three-layer screen film 8. This has a non-conductive layer 16 as a carrier layer and conductive layers 18a, 18b mounted on both sides. Reference numeral 18a denotes the outwardly directed conductive layer and reference numeral 18b denotes the inwardly directed conductive layer. In particular, the screen film 8 is a laminated film, in which metal layers for forming the conductive layers 18a, 18b are applied to the carrier layer 16 on both sides in particular. The conductive layers 18a, 18b extend over the entire surface of the non-conductive layer 16. The screen film 8 has a total thickness d, which is preferably <60 microns. The two conductive layers 18a, 18b have, for example, a thickness in the range of 20 to 30 .mu.m and the rest is attributable to the non-conductive layer 16 of the carrier layer.

Wie aus den Fig. 2 und 3 zu entnehmen ist, überdecken sich im Überlappungsbereich 12 zwei Längskantenbereiche der Schirmfolie 8 flächig, ohne dass im Bereich einer der Längskanten die Schirmfolie 8 umgefaltet wäre. Im Bereich dieser Längskanten weist die Schirmfolie 8 jeweils eine Stirnkante 20 auf. In beiden Ausführungsvarianten ist nunmehr eine elektrisch leitfähige Verbindung einer der beiden leitfähigen Lagen 18a, 18b an der Stirnkante 20 mit einem flächigen weiteren Teilbereich 22 derselben Lage 18a, 18b im Überlappungsbereich 12 ausgebildet.Like from the Fig. 2 and 3 2, two longitudinal edge regions of the screen foil 8 overlap one another in the overlapping region 12, without the screen foil 8 being folded over in the region of one of the longitudinal edges. In the region of these longitudinal edges, the screen foil 8 has an end edge 20 in each case. In both embodiments, an electrically conductive connection of one of the two conductive layers 18a, 18b to the front edge 20 is now formed with a planar further partial region 22 of the same layer 18a, 18b in the overlapping region 12.

Bei der Ausführungsvariante der Fig. 2 erfolgt dies mit Hilfe eines leitfähigen Streifens 24, welcher an der Stirnkante 20 angebracht ist und sozusagen die Stirnkante 20 in Längsrichtung 4 mit leitfähigem Material umgibt. Hierdurch ist eine elektrisch leitfähige Verbindung und damit eine Leitbrücke zwischen der äußeren leitfähigen Lage 18a an der Stirnkante 20 und derselben leitfähigen Lage 18a im weiteren Teilbereich 22 gebildet. Dadurch ist also die äußere Lage 18a elektrisch geschlossen, so dass auch in Umfangsrichtung Querströme innerhalb der Lage 18a fließen können.In the embodiment of the Fig. 2 this is done by means of a conductive strip 24 which is attached to the front edge 20 and, so to speak, surrounds the front edge 20 in the longitudinal direction 4 with conductive material. As a result, an electrically conductive connection and thus a guide bridge between the outer conductive layer 18a at the end edge 20 and the same conductive layer 18a in the further portion 22 is formed. As a result, therefore, the outer layer 18a is electrically closed, so that in the circumferential direction transverse currents can flow within the layer 18a.

Bei der Ausführungsvariante der Fig. 3 ist die Stirnkante 20, insbesondere die der unten liegenden Längskante der Schirmfolie 8, abgeschrägt ausgebildet, so dass ein bevorzugt spitzer Winkel α ausgebildet ist. Die Stirnkante 20 ist bezüglich einer Flächennormalen 26 unter dem Winkel α orientiert, welcher vorzugsweise >45° und insbesondere >60° liegt. Durch diese Maßnahme wird bei der unteren leitfähigen Lage 18b ein über die mittlere nicht leitende Lage 16 überstehender Bereich ausgebildet, über den dann die elektrisch leitende Verbindung an der Stirnkante 20 mit derselben unteren Lage 18b im weiteren Teilbereich 22 erfolgt. In diesem weiteren Teilbereich 22 schmiegt sich die Schirmfolie 8 daher mit ihrer unteren leitfähigen Lage 18b an die abgeschrägte Stirnkante 20 an.In the embodiment of the Fig. 3 the front edge 20, in particular that of the lower longitudinal edge of the screen foil 8, is beveled, so that a preferably acute angle α is formed. The end edge 20 is oriented with respect to a surface normal 26 at the angle α, which is preferably> 45 ° and in particular> 60 °. By virtue of this measure, a region projecting beyond the middle non-conductive layer 16 is formed at the lower conductive layer 18b, via which the electrically conductive connection then takes place at the end edge 20 with the same lower layer 18b in the further partial region 22. In this further sub-region 22, the screen foil 8 therefore nestles against the beveled end edge 20 with its lower conductive layer 18b.

Grundsätzlich lassen sich die Ausführungsvarianten der Fig. 2 und 3 auch miteinander kombinieren, d.h. ergänzend zu dem leitfähigen Streifen 24 ist noch die abgeschrägte Stirnkante 20 ausgebildet.Basically, the variants of the Fig. 2 and 3 also combine with each other, ie in addition to the conductive strip 24 is still the beveled end edge 20 is formed.

Um eine zuverlässige flächige dauerhaft feste Haftung der Schirmfolie 8 an der Isolierung 6 zu gewährleisten ist weiterhin eine Haftschicht 28 ausgebildet, die zwischen der Isolierung 6 und der innersten Lage 18b der Schirmfolie 8 angeordnet ist. Dies ist beispielhaft in der Fig. 2 illustriert. Die Haftschicht 28 ist beispielsweise eine Heißklebeschicht, die unmittelbar vor dem Anbringen der Schirmfolie 8 auf diese an der unteren leitfähigen Lage 18b aufgebracht wird. Neben der Verbindung mit der Isolierung 6 wird dabei auch der besondere Vorteil erzielt, dass über die Haftschicht 28 die beiden Längskanten der Schirmfolie 8 im Überlappungsbereich 12 aneinander fixiert sind.In order to ensure a reliable surface permanent adhesion of the screen film 8 to the insulation 6, an adhesive layer 28 is further formed, which is disposed between the insulation 6 and the innermost layer 18b of the screen film 8. This is exemplary in the Fig. 2 illustrated. The adhesive layer 28 is, for example, a hot-melt adhesive layer which is applied to the lower conductive layer 18b immediately before the attachment of the screen foil 8 thereto. In addition to the connection with the insulation 6, the special advantage is achieved that the two longitudinal edges of the shielding film 8 are fixed to one another in the overlap region 12 via the adhesive layer 28.

Unmittelbar nachfolgend zu dem Anbringen der Schirmfolie 8 wird noch der Außenmantel 10 mittels eines Extrusionsverfahrens aufgebracht. Hierzu wird ein sogenannter Mantelextruder eingesetzt. Unmittelbar vorlaufend zur Mantelextrusion wird längseinlaufend dem Mantelextruder die Schirmfolie 8 zugeführt. Gleichzeitig ist vor dem Extrusionskopf für den Außenmantel 10 eine Auftragsvorrichtung, beispielsweise eine Düse etc. angeordnet, mittels der der leitfähige Streifen 24 im Bereich der Stirnkante 20 aufgebracht wird.Immediately following the attachment of the shielding foil 8, the outer shell 10 is applied by means of an extrusion process. For this purpose, a so-called jacket extruder is used. Immediately preceding the jacket extrusion, the shield foil 8 is fed in lengthwise to the jacket extruder. At the same time, an application device, for example a nozzle, etc., is arranged in front of the extrusion head for the outer jacket 10, by means of which the conductive strip 24 is applied in the region of the front edge 20.

Durch die bei der Extrusion des Außenmantels 10 eingebrachte Wärme wird der Heißkleber der Haftschicht 28 aktiviert und dadurch die Klebeverbindung zwischen der Isolierung 6 und der Schirmfolie 8 ausgebildet.The heat introduced during the extrusion of the outer jacket 10 activates the hot-melt adhesive of the adhesive layer 28 and thereby forms the adhesive bond between the insulation 6 and the screen foil 8.

Die abgeschrägte Stirnkante 20 bei der Ausführungsvariante der Fig. 3 wird vorzugsweise mit Hilfe eines Schneidvorgangs ausgebildet. Hierzu wird eine herkömmlich präparierte Schirmfolie 8 beispielsweise mit Hilfe eines schräg gestellten Messers zugeschnitten. Alternativ wird eine herkömmlich vorbereitete Schirmfolie 8 mit senkrechten Schnittkanten an den Schnittkanten beispielsweise durch Abschaben abgeschrägt.The beveled end edge 20 in the embodiment of the Fig. 3 is preferably formed by means of a cutting process. For this purpose, a conventionally prepared shielding film 8 is cut, for example, with the aid of an inclined blade. Alternatively, a conventionally prepared visor foil 8 with vertical cut edges is beveled at the cut edges, for example by scraping.

Die Kontaktierung der Schirmfolie 8 mit einem Kontaktelement 30 ist beispielhaft in der Fig. 4 dargestellt. Das Kontaktelement 30 ist vorzugsweise als eine ring- oder zylinderförmige Kontakthülse ausgebildet. Die Datenleitung 2 ist mit einem von dem Außenmantel 10 befreiten Stirnende in das Kontaktelement 30 eingelegt.The contacting of the screen foil 8 with a contact element 30 is exemplary in the Fig. 4 shown. The contact element 30 is preferably designed as a ring-shaped or cylindrical contact sleeve. The data line 2 is inserted into the contact element 30 with a front end freed from the outer jacket 10.

Auf die Schirmfolie 8 ist dabei ein ringförmiger Streifen einer Lötpaste 32 angebracht. Über die Lötpaste 32 erfolgt die elektrische Kontaktverbindung mit dem Kontaktelement 30. Hierzu ist keine Ausübung eines Pressdruckes erforderlich. Die Kontaktverbindung ist daher druckfrei und stoffschlüssig.In this case, an annular strip of a solder paste 32 is attached to the screen foil 8. About the solder paste 32, the electrical contact connection is made with the contact element 30. For this no exercise of a pressing pressure is required. The contact connection is therefore pressure-free and cohesive.

Zur Ausbildung der elektrischen Kontaktverbindung wird beim Herstellen derselben zweckdienlicherweise ein elektrischer Strom im Bereich der Lötpaste 32 mit Hilfe zweier Elektroden 34 zugeführt, so dass kurzfristig und lokal eine Überhitzung erfolgt, so dass die Lötpaste 32 aufschmilzt und die gewünschte dauerhaft elektrisch leitfähige Verbindung ausgebildet wird. Alternativ zur Lötpaste 32 kann auch ein Leitkleber verwendet werden.To form the electrical contact connection, an electrical current in the area of the solder paste 32 is expediently supplied with the aid of two electrodes 34 so that the solder paste 32 melts and the desired permanently electrically conductive connection is formed. As an alternative to the solder paste 32, a conductive adhesive can also be used.

Bei dem Kontaktelement 30 handelt es sich alternativ zu einer Kontakthülse um einen Crimpbereich eines herkömmlichen Steckkontaktelements. Ein derartiger Crimpbereich bildet üblicherweise einen Käfig für die Aufnahme der zu kontaktierenden Leitung aus. Dieser ist üblicherweise gebildet durch Crimplaschen, die abstehen und bei einem normalen Crimpvorgang umgebogen werden. Bei der Verwendung eines derartigen herkömmlichen Steckkontaktelements mit Crimpbereich, die üblicherweise als Blechbiegestanzteile ausgebildet sind, wird bei der Verwendung der vorliegenden Datenleitung 2 auf das Crimpen verzichtet und lediglich die zur Fig. 4 beschriebene stoffschlüssige Verbindung ausgebildet. Das Kontaktelement 30 ist allgemein ein Teil eines Steckkontakts.As an alternative to a contact sleeve, the contact element 30 is a crimping region of a conventional plug-in contact element. Such a crimping area usually forms a cage for receiving the line to be contacted. This is usually formed by Crimplaschen that protrude and bent during a normal crimping process. When using such a conventional plug-in contact element with crimping, which are usually formed as sheet metal stamped parts, is dispensed with the use of the present data line 2 on the crimping and only the to Fig. 4 designed cohesive connection formed. The contact element 30 is generally part of a plug contact.

Die hier beschriebene Datenleitung 2 wird insbesondere in einem Bordnetz eines Kraftfahrzeugs eingesetzt. Durch die hier beschriebenen Maßnahmen ist eine besonders kostengünstige Herstellung bei gleichzeitig guter Schirmwirkung erreicht.The data line 2 described here is used in particular in a vehicle electrical system of a motor vehicle. By the measures described here a particularly cost-effective production is achieved with good shielding effect.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

22
Datenleitungdata line
44
Innenleiterinner conductor
66
Isolierunginsulation
88th
Schirmfolieshield foil
1010
Außenmantelouter sheath
1212
Überlappbereichoverlap
1414
Längsrichtunglongitudinal direction
1616
nicht leitfähige Lagenon-conductive position
18a18a
leitfähige äußere Lageconductive outer layer
18b18b
leitfähige innere Lageconductive inner layer
2020
Stirnkantefront edge
2222
weiterer Teilbereichfurther subarea
2424
leitfähiger Streifenconductive strip
2626
Normalenormal
2828
Hautschichtskin layer
3030
Kontaktelementcontact element
3232
Lötpastesolder paste
3434
Elektrodeelectrode
dd
Dickethickness

Claims (15)

  1. Data line (2) having a line core (4, 6) extending in a longitudinal direction (14) that has at least one conductor (4) surrounded by an insulator (6) and that is surrounded by a multi-layered screening foil (8) that has a plastic carrier layer as a non-conductive layer (16) and a conductive layer (18a, 18b) applied thereon and, in an overlapping region (12), a free end edge (20) of the screening foil (8) overlaps a further partial region (22) of the screening foil (8),
    characterised in that,
    in the overlapping region (12), the conductive layer (18a, 18b) is electrically conductively connected to the same conductive layer (18a, 18b) in the partial region (22) on the end edge at the end face.
  2. Data line (2) according to claim 1,
    characterised in that
    the electrically conductive connection is formed by a conductive strip (24) applied in the region of the end edge (20).
  3. Data line (2) according to claim 2,
    characterised in that
    the conductive strip (24) is formed by applying a conductive material by means of an application method such as spraying on, imprinting or slipping on or by adhering.
  4. Data line (2) according to one of the preceding claims,
    characterised in that
    the screening foil (8) is bevelled on the end edge (12) at an angle α and a contact to the further partial region of the conductive layer (18a, 18b) is formed on the bevelled end edge (12).
  5. Data line (2) according to the preceding claim,
    characterised in that
    the angle α is greater than 30°, preferably greater than 45° and, in particular, greater than 60°, in terms of a surface normal (26) of the screening foil (8).
  6. Data line (2) according to one of the preceding claims,
    characterised in that
    the screening foil (8) is formed as a longitudinally folded foil, in which the end edge (12) runs in parallel to the longitudinal direction (14).
  7. Data line (2) according to one of the preceding claims,
    characterised in that
    the conductive layer (18a, 18b) of the screening foil (8) has a thickness (d) of less than 50µm and, in particular, ranging from 3µm to 35µm.
  8. Data line (2) according to one of the preceding claims,
    characterised in that
    the screening foil (8) is adhered flatly to the insulator (6) and, to do so, in particular an adhesive layer (28), preferably a (hot) glue layer, is formed that is optionally part of the screening foil (8) or the insulator (6).
  9. Data line (2) according to one of the preceding claims,
    characterised in that
    the individual layers (16, 18a, 18b) of the screening foil (8) are applied to one another over the entire surface, wherein, despite the non-conductive layer (16), a completely continuous conductive connection is formed within the conductive layer (18a, 18b).
  10. Data line (2) according to one of the preceding claims,
    characterised in that
    the screening foil (8) is integrally electrically conductively connected on the end side to a contact element (30), in particular by means of gluing, soldering or welding.
  11. Data line (2) according to one of the preceding claims,
    characterised in that
    the insulator (6) consists of a heat-resistant material which withstands a temperature of above 100°C and preferably above 150°C.
  12. Method for producing a data line (2) according to one of the preceding claims, wherein a screening foil (8) is placed around a line core (4, 6) that has at least one conductor (4) surrounded by an insulator (6), said screening foil (8) having a plastic carrier layer as a non-conductive layer (16) and a conductive layer (18a, 18b) applied thereto, wherein, in an overlapping region (12), a free end edge (20) of the screening foil (8) is positioned to overlap with a further partial region (22) of the screening foil (8) and wherein an outer casing (10) is extruded,
    characterised in that,
    in the overlapping region (12), an electrically conductive connection of the conductive layer (18a, 18b) to the same conductive layer (18a, 18b) is formed on its end edge on the end face in the partial region (22).
  13. Method according to the preceding claim,
    characterised in that
    the conductive connection is formed by applying a conductive strip (24) by means of an application method such as spraying on, imprinting or slipping on or by adhering.
  14. Method according to the preceding claim,
    characterised in that
    the conductive strip (24) is applied on the end edge (12) and, immediately thereafter, the outer casing (10) is extruded.
  15. Method according to one of claims 12 to 14,
    characterised in that
    the screening foil (8) is firstly formed to be bevelled on the end edge (12) and subsequently, when applying around the line core (4, 6), the bevelled end edge (12) is brought into contact with the conductive layer (18a, 18b).
EP14812416.7A 2013-11-25 2014-11-21 Data line and method for producing the data line Active EP3074985B1 (en)

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DE102013224044 2013-11-25
DE102014207010 2014-04-11
PCT/EP2014/075335 WO2015075208A1 (en) 2013-11-25 2014-11-21 Data line and method for producing the data line

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EP3074985B1 true EP3074985B1 (en) 2017-07-12

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US10950367B1 (en) * 2019-09-05 2021-03-16 Te Connectivity Corporation Electrical cable

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US20190221333A1 (en) 2019-07-18
US20160268021A1 (en) 2016-09-15
WO2015075208A1 (en) 2015-05-28
US10340061B2 (en) 2019-07-02
EP3074985A1 (en) 2016-10-05

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