EP1632957A2 - Multilayer striplike shielding film for electrical lines and electrical cable equipped therewith, especially data transmission cable. - Google Patents

Multilayer striplike shielding film for electrical lines and electrical cable equipped therewith, especially data transmission cable. Download PDF

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Publication number
EP1632957A2
EP1632957A2 EP05009884A EP05009884A EP1632957A2 EP 1632957 A2 EP1632957 A2 EP 1632957A2 EP 05009884 A EP05009884 A EP 05009884A EP 05009884 A EP05009884 A EP 05009884A EP 1632957 A2 EP1632957 A2 EP 1632957A2
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EP
European Patent Office
Prior art keywords
shielding
layer
data transmission
strip
electrical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05009884A
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German (de)
French (fr)
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EP1632957A3 (en
EP1632957B1 (en
Inventor
Christian Dr. Pfeiler
Andreas Dipl.-Ing. Wassmuth
Jörg Weissbrod
Brian George Race
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Draka Comteq Germany GmbH and Co KG
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Draka Comteq Germany GmbH and Co KG
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Publication of EP1632957A3 publication Critical patent/EP1632957A3/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
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H01B11/1008—Features relating to screening tape per se
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/20—Conductive material dispersed in non-conductive organic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B11/00—Communication cables or conductors
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • H01B11/08—Screens specially adapted for reducing cross-talk
    • H01B11/085—Screens specially adapted for reducing cross-talk composed of longitudinal tape conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/1845—Sheaths comprising perforations

Definitions

  • the invention relates to a multilayer, strip-shaped shielding foil for electrical lines, in particular for multicore data transmission cables, with at least one carrier layer of a plastic and at least one shielding layer connected to the carrier layer of an electrically conductive material, in particular of metal. Furthermore, the invention relates to an electrical cable, in particular data transmission cable, with at least one line, but in particular with a plurality of twisted pair lines, so-called "twisted pairs", in which the aforementioned shielding film is used.
  • Common data transmission cables use several, for example, four of the above-mentioned twisted pairs, which must be shielded with increasing category of transmission bandwidth and transmission quality. Both the outer shielding of the twisted pairs as a whole, as well as the mutual shielding of the twisted pairs in a cable plays a role.
  • the invention has the object, a shielding foil for electrical cables and in particular for multi-wire data transmission cable in such a way that while it retains its shielding properties substantially unimpaired, but completely avoids the above grounding problem.
  • the pitch gaps return at periodic intervals.
  • the measure ratio of gap width to the length of the gap between the gap gaps remaining pieces of film is preferably in the range between 1: 5 and 1:25, with typical film lengths in the range of 60 to 120 mm and typical Abstandsspaltbreiten in the range of 5 to 10 mm.
  • the corresponding geometric values are to be designed in such a way that no characteristic impedance peaks or return loss peaks occur in the transmission frequency range of the data transmission cable due to the periodicity of the structure.
  • successive spacing gaps are arranged at a preferably small acute angle to the strip transverse direction. With alternate angular position, the pieces of film remaining between the spacing gaps are then trapezoidal.
  • This embodiment has the advantage that in a winding of such AblefolienstMail about its longitudinal axis to form a tubular casing, the spacing gaps run helically, which brings in interruption of the current path in the longitudinal direction relative to the strictly perpendicular to the strip longitudinal direction columns advantages in Able with it.
  • the pieces of film remaining therebetween are parallelogram-shaped.
  • This embodiment allows for application of the shielding film in the longitudinal direction of the cable axis, a gap which rotates as a helix about the cable axis.
  • Bandierstrom or during the stranding of the cable while the acute angle of the gap gaps can be designed to the strip transverse direction so that a compensation leads to the stranding angle to a cylindrical metal-free gap.
  • a particularly robust embodiment with a high protection for the sensitive metallic shielding layer results from a lamination of the shielding layer between two carrier layers.
  • the protective effect is further improved if these carrier layers protrude beyond the longitudinal edges of the shielding layer and are connected to one another there.
  • the invention also relates to an electrical cable and, in particular, to data transmission cables, the outer covering and / or an inner supporting and separating structure consisting of the shielding film in one of the embodiments discussed above.
  • the outer enclosure protects the overall environment against against emitted from the cable energies and existing in the cable transmission elements, for example in the form of several twisted pairs, against irradiated interference energy.
  • the latter aspect is of particular importance in the application of 10GB Ethernet on copper data transmission cables. Namely, the so-called "cable crosstalk" - also referred to as alien NEXT or alien EL-FEXT - drastically reduced by the outer sheath.
  • the internal crosstalk between the individual twisted pairs is achieved by integrating the shielding foil into an inner supporting and separating structure, such as, for example, by folding the shielding foil into an inlay Profile four-armed star configuration can be drastically reduced. Due to the flexibility of the shielding film, it can be placed in virtually any configuration and adapted to a wide variety of line assignments within the cable. A large number of examples in which, however, nowhere a shielding foil with a shielding layer interrupted in the longitudinal direction is used can be taken from, inter alia, the documents US Pat. No. 6,624,359 B2, US 2003/0217863 A1 or EP 0 915 486 A1.
  • a multi-layer, strip-shaped shielding 1 is clear.
  • This has a first carrier layer 2 of a continuous, strip-shaped plastic material, such as preferably polyester, a thickness of 9 to 50 microns.
  • a shielding layer 3 is laminated, which consists of individual metal foil pieces 4, which are separated by a gap 5 from each other.
  • These rectangular pieces of film have a typical length L in the strip longitudinal direction Z, which is 60 to 120 mm.
  • the gap width D in strip longitudinal direction Z is typically about 5 to 10 mm, so that the measurement ratio of gap width D to length L of the film pieces 4 is between 1: 5 and 1:25.
  • the width of the film pieces 4 is slightly smaller than that of the carrier layer 2, so that the longitudinal edges 6 of the carrier layer 2 protrude beyond the longitudinal edges 7 of the shielding layer 3 by a few millimeters.
  • the metal foil of the shielding layer 3 is preferably made of aluminum with a layer thickness between 5 and 50 microns.
  • a further carrier layer 8 is laminated, so that a kind of film sandwich is formed.
  • the carrier layer 8 is made of the same material as the carrier layer 2 and is fixedly connected to the lower carrier layer 2 in the region of the longitudinal edges protruding laterally beyond the shielding layer 3.
  • the shielding layer 3 is hermetically sealed to the outside.
  • the permanent connection of the three layers 2, 3, 8 takes place by means of suitable adhesive materials, which are customary in the field of laminating films.
  • the carrier layer 2 can be made of a uniform material for manufacturing and stability reasons multi-layered.
  • Fig. 1 is not shown in detail, instead of the laterally projecting longitudinal edges of the two carrier layers 2, 8 and the upper carrier layer 8 ends with its longitudinal edge 6 flush with the longitudinal edge of the metal foil pieces 4, so that when winding the shielding film 1 to corresponding Lines, as will be discussed in more detail below with reference to FIGS. 6 to 9, the overlapping longitudinal edges of the shielding film 1 in the coverage area not so strong.
  • the longitudinal edges 6 of the carrier layers 2, 8 and the longitudinal edges 7 of the shielding layer 3 can also end flush with each other, so that the longitudinal edge 7 of the shielding layer 3 accessible from the outside and remains recognizable.
  • the embodiment of the shielding film 1 'shown in FIG. 2 differs from the variant according to FIG. 1 only in the course of the gap gaps 5. These are not arranged strictly perpendicular to the strip longitudinal direction Z, but extend at a small acute angle W to the strip transverse direction X. Directions of this oblique course of the distance gap 5 to distance gap 5 are opposite to such that the film pieces 4 are designed trapezoidal between two adjacent spacing columns 5 in plan view.
  • these spacing gaps are arranged at a small acute angle W to the strip transverse direction X, but in this shielding film 1 '"they are arranged parallel to one another.
  • the film pieces 4 are configured parallelogram in plan view between two adjacent spacing columns 5 in plan view.
  • FIGS. 4 and 5 show an inner supporting and separating structure 9 - a so-called “Spline” - in which the shielding film 1 'is folded onto itself in the longitudinal direction Z of the strip in such a way that four star-shaped separating webs 10 are formed
  • the inner carrier layer 2 can be fixed in the flanking regions by suitable adhesives 10, the impact between the two longitudinal edges 11 of the shielding film 1 'can be seen.
  • the shielding layer 3 runs open into the longitudinal edge 11.
  • the entire arrangement of inner supporting and separating structure 9 and the four twisted pair lines 13 is closed by an outer casing 14, which likewise consists again of a shielding film 1 ".
  • This strip-shaped shielding film is folded over into a tube and, for example, welded together in the region of its overlapping longitudinal edges 11.
  • the entire line arrangement 15 is also completely shielded towards the outside.
  • the oblique course of the gap 5 is indicated, moreover. It can be seen that the ends of the gap gaps 5 are arranged offset in the strip longitudinal direction Z to each other. Due to the helical course of the gap 5, a continuous over the cable cross-section irradiation level for electromagnetic radiation is avoided.
  • FIG. 7 although the data transmission cable 15 'is again provided with the outer shielded sheath 14 analogous to the embodiment of FIG. 6, the inner support and separation structure is a common cross profile 16 extruded from an insulating plastic , Furthermore, an outer protective sheath 17 made of a polymeric insulating material which partially closes off the data transmission cable 15 "to the outside is shown in FIG. 7 - also representative of the embodiments according to FIGS. 6, 8 and 9. as shown - longitudinal tube or as a helical winding applied shielding 1 "and is optionally permanently connected thereto via an optionally provided adhesive layer 18. In this case, during the installation of the cable 15 'whose stripping and the exposure of the lines 13 is facilitated by the removal of the outer protective jacket 17 then at the same time the shielding foil 1 "is deducted.
  • an inner protective jacket 19 can then also be used, which is applied to the cable base element with the cross profile 16 and the four pairs of twisted-pair lines 13. Then the shielding film 1 "is applied longitudinally wound or wound and supplemented with the protective jacket 17 with adhesive layer 18.
  • a very wide shielding film 1" is partially folded onto itself in such a form-fitting manner that the four twisted-pair lines 13 are respectively outwardly and inwardly surrounded by the shielding film 1 ".
  • This cross-sectionally “ornamental”, meandering envelope of the twisted pair lines thus serves to shield both outwardly and between the lines 13.
  • an outer mechanical protective cover is clearly arranged omitted.

Abstract

An electrically conductive metal shielding layer (3) covers first (2) and second (8) carrier layers . Running crosswise to a longitudinal strip direction (Z) and recurring with lengthwise gaps (P), a spacer split (5) fits in the shield layer (3) so as to create an electrical interruption in this layer in the longitudinal strip direction. An independent claim is also included for an electric data-transmission cable with multiple twisted wire pairs and an outer casing of foil shielding.

Description

Die Erfindung betrifft eine mehrlagige, streifenförmige Abschirmfolie für elektrische Leitungen, insbesondere für mehradrige Datenübertragungskabel, mit mindestens einer Trägerlage aus einem Kunststoff und mindestens einer mit der Trägerlage verbundenen Abschirmlage aus einem elektrisch leitfähigen Material, insbesondere aus Metall. Ferner bezieht sich die Erfindung auf ein elektrisches Kabel, insbesondere Datenübertragungskabel, mit mindestens einer Leitung, insbesondere jedoch mit mehreren verdrillten Paar-Leitungen, sogenannten "twisted pairs", in der die eingangs genannte Abschirmfolie eingesetzt ist.The invention relates to a multilayer, strip-shaped shielding foil for electrical lines, in particular for multicore data transmission cables, with at least one carrier layer of a plastic and at least one shielding layer connected to the carrier layer of an electrically conductive material, in particular of metal. Furthermore, the invention relates to an electrical cable, in particular data transmission cable, with at least one line, but in particular with a plurality of twisted pair lines, so-called "twisted pairs", in which the aforementioned shielding film is used.

Die der Erfindung zugrundeliegende Problematik lässt sich am augenscheinlichsten anhand von Hochgeschwindigkeits-Datenübertragungskabeln erläutern, was die Anwendung der Erfindung jedoch nicht auf diesen Zweck beschränkt.The problem underlying the invention can be explained most obviously by means of high-speed data transmission cables, which does not limit the application of the invention to this purpose.

Gängige Datenübertragungskabel verwenden mehrere, beispielsweise vier der oben erwähnten twisted pairs, die bei steigender Kategorie der Übertragungsbandbreite und Übertragungsgüte geschirmt sein müssen. Dabei spielt sowohl die äußere Schirmung der twisted pairs insgesamt, als auch die gegenseitige Abschirmung der twisted pairs in einem Kabel eine Rolle.Common data transmission cables use several, for example, four of the above-mentioned twisted pairs, which must be shielded with increasing category of transmission bandwidth and transmission quality. Both the outer shielding of the twisted pairs as a whole, as well as the mutual shielding of the twisted pairs in a cable plays a role.

Zur Erzielung entsprechender Spezifikationen von Übertragungsbandbreite und Übertragungsgüte ist es beispielsweise aus der US 6 624 359 B2 bekannt, die twisted pairs mit einer Abschirmfolie zu versehen, die aus einem Laminat bestehend aus einer Trägerlage aus einem Kunststoff und einer darauf kaschierten Abschirmlage aus Metall besteht. In dieser Druckschrift sind ferner unterschiedlichste Konfigurationen gezeigt, wie diese Laminatfolie zu einer um mehrere twisted pairs gelegten äußeren Abschirmhülle und einer beispielsweise sternförmigen internen Separier- und Stützstruktur gefaltet werden kann. Grundsätzlich ist dabei die Abschirmfolie jedoch so ausgelegt, dass sie als streifenförmiges Material in Streifenlängsrichtung eine durchgehende Abschirmlage aus beispielsweise Aluminium oder Kupfer aufweist.In order to achieve appropriate specifications of transmission bandwidth and quality of transmission, it is known, for example, from US Pat. No. 6,624,359 B2 to provide the twisted pairs with a shielding film which consists of a laminate consisting of a carrier layer made of a plastic material and a laminated thereon shielding layer consists of metal. In this document, a wide variety of configurations are also shown how this laminate film can be folded into an outer shielding sheath placed around several twisted pairs and, for example, a star-shaped internal separating and supporting structure. Basically, however, the shielding film is designed so that it has a continuous shielding layer of, for example, aluminum or copper as a strip-shaped material in the strip longitudinal direction.

Die vorstehende Auslegung mit in Kabellängsrichtung durchgehender, elektrisch leitender Abschirmlage führt nun zu einer Erdungsproblematik, da bei unterschiedlichen Potentialen an den Enden einer Leitung hohe Potentialausgleichsströme durch die Schirmung laufen können. Diese verursachen ihrerseits Störungen und unter Umständen sogar Schäden an den mit einem solchen Datenübertragungskabel verbundenen Geräten.The above design with an electrically conductive shielding layer which extends continuously in the cable longitudinal direction now leads to a grounding problem since high equipotential bonding currents can pass through the shielding at different potentials at the ends of a line. These, in turn, cause interference and possibly even damage to the devices connected to such a data transmission cable.

Ausgehend von dieser Problematik liegt der Erfindung die Aufgabe zugrunde, eine Abschirmfolie für elektrische Leitungen und insbesondere für mehradrige Datenübertragungskabel so auszugestalten, dass sie zwar ihre Abschirmungseigenschaften im wesentlichen unbeeinträchtigt behält, jedoch die vorstehende Erdungsproblematik vollständig vermeidet.Based on this problem, the invention has the object, a shielding foil for electrical cables and in particular for multi-wire data transmission cable in such a way that while it retains its shielding properties substantially unimpaired, but completely avoids the above grounding problem.

Diese Aufgabe wird dadurch gelöst, dass die streifenförmige Abschirmfolie quer zur Streifenlängsrichtung verlaufende, in Längsabständen wiederkehrende Abstandsspalte in der Abschirmlage aufweist, die deren elektrische Unterbrechung in Streifenlängsrichtung dienen. Es existiert also in Längsrichtung der Abschirmfolie keine durchgehend elektrisch leitende Verbindung, was das Fließen von Potentialausgleichsströmen vollständig unterbindet. Da die Spalte jedoch im Vergleich zur verbleibenden Schirmfläche der zwischen den Abstandsspalten liegenden Folienstücke klein bleibt, wird keine signifikante Verschlechterung des Schirmverhaltens der Abschirmfolie festzustellen sein.This object is achieved in that the strip-shaped shielding film extending transversely to the strip longitudinal direction, in longitudinal intervals recurring distance gaps in the shielding layer, which serve their electrical interruption in the strip longitudinal direction. Thus, there is no continuous electrically conductive connection in the longitudinal direction of the shielding foil, which completely prevents the flow of equipotential bonding currents. As the column, however, compared to the remaining screen area the gap between the gap gaps remains small, no significant deterioration of the shield behavior of the shielding be determined.

Gemäß einer bevorzugten Ausführungsform der Erfindung kehren die Abstandsspalte in periodischen Abständen wieder. Das Maßverhältnis von Abstandsspaltbreite zur Länge der zwischen den Abstandsspalten verbleibenden Folienstücke liegt dabei vorzugsweise im Bereich zwischen 1:5 und 1:25, wobei typische Folienstücklängen im Bereich von 60 bis 120 mm und typische Abstandsspaltbreiten im Bereich von 5 bis 10 mm liegen können. In der Praxis sind die entsprechenden geometrischen Werte derart auszulegen, dass im Übertragungsfrequenzbereich des Datenübertragungskabels keine Wellenwiderstandsspitzen oder Rückflussdämpfungsspitzen aufgrund der Periodizität der Struktur auftreten.According to a preferred embodiment of the invention, the pitch gaps return at periodic intervals. The measure ratio of gap width to the length of the gap between the gap gaps remaining pieces of film is preferably in the range between 1: 5 and 1:25, with typical film lengths in the range of 60 to 120 mm and typical Abstandsspaltbreiten in the range of 5 to 10 mm. In practice, the corresponding geometric values are to be designed in such a way that no characteristic impedance peaks or return loss peaks occur in the transmission frequency range of the data transmission cable due to the periodicity of the structure.

Gemäß einer weiteren bevorzugten Ausführungsform der Erfindung sind aufeinanderfolgende Abstandsspalten in einem vorzugsweise kleinen spitzen Winkel zur Streifenquerrichtung angeordnet. Bei wechselweiser Winkellage sind die zwischen den Abstandsspalten verbleibenden Folienstücke dann trapezförmig. Diese Ausgestaltung hat den Vorteil, dass bei einem Wickeln derartiger Abschirmfolienstreifen um ihre Längsachse zur Bildung einer Schlauchhülle die Abstandsspalten helixförmig verlaufen, was bei Unterbrechung des Strompfades in Längsrichtung gegenüber den streng rechtwinklig zur Streifenlängsrichtung verlaufenden Spalten Vorteile im Abschirmverhalten mit sich bringt.According to a further preferred embodiment of the invention, successive spacing gaps are arranged at a preferably small acute angle to the strip transverse direction. With alternate angular position, the pieces of film remaining between the spacing gaps are then trapezoidal. This embodiment has the advantage that in a winding of such Abschirmfolienstreifen about its longitudinal axis to form a tubular casing, the spacing gaps run helically, which brings in interruption of the current path in the longitudinal direction relative to the strictly perpendicular to the strip longitudinal direction columns advantages in Abschirmverhalten with it.

Bei zueinander parallelen Winkellagen der Abstandsspalten zur Streifenquerrichtung sind die dazwischen verbleibenden Folienstücke parallelogrammförmig. Diese Ausführungsform erlaubt bei Aufbringung der Abschirmfolie in Längsrichtung zur Kabelachse einen Spalt, der als Helix um die Kabelachse rotiert. Bei Aufbringung der Folie mit einer sogenannten Bandieranlage oder während der Verseilung des Kabels kann dabei der spitze Winkel der Abstandsspalte zur Streifenquerrichtung so ausgelegt werden, dass eine Kompensation mit dem Verseilwinkel zu einem zylindrischen metallfreien Spalt führt.In the case of mutually parallel angular positions of the spacing gaps relative to the strip transverse direction, the pieces of film remaining therebetween are parallelogram-shaped. This embodiment allows for application of the shielding film in the longitudinal direction of the cable axis, a gap which rotates as a helix about the cable axis. When applying the film with a so-called Bandieranlage or during the stranding of the cable while the acute angle of the gap gaps can be designed to the strip transverse direction so that a compensation leads to the stranding angle to a cylindrical metal-free gap.

Eine besonders robuste Ausführungsform mit einem hohen Schutz für die empfindliche metallene Abschirmlage ergibt sich durch eine Einlaminierung der Abschirmlage zwischen zwei Trägerlagen. Der Schutzeffekt wird noch verbessert, wenn diese Trägerlagen über die Längsränder der Abschirmlage hinausstehen und dort miteinander verbunden sind.A particularly robust embodiment with a high protection for the sensitive metallic shielding layer results from a lamination of the shielding layer between two carrier layers. The protective effect is further improved if these carrier layers protrude beyond the longitudinal edges of the shielding layer and are connected to one another there.

Die Erfindung bezieht sich auch auf ein elektrisches Kabel und insbesondere Datenübertragungskabel, wobei die äußere Umhüllung und/oder eine innere Stütz- und Separierstruktur aus der Abschirmfolie in einer der vorstehend erörterten Ausführungsfbrmen besteht. Die äußere Umhüllung schützt als Gesamtschirm dabei die Umgebung gegen aus dem Kabel abgestrahlte Energien und die im Kabel vorhandenen Übertragungselemente, beispielsweise in Form mehrerer twisted pairs, gegen eingestrahlte Störenergie. Insbesondere letzterem Aspekt kommt bei der Anwendung des 10GB-Ethernet auf Kupfer-Datenübertragungskabeln eine besondere Bedeutung zu. Durch die äußere Umhüllung wird nämlich das sogenannte "Kabelübersprechen" ― auch als Alien-NEXT bzw. Alien-EL-FEXT bezeichnet ― drastisch reduziert.The invention also relates to an electrical cable and, in particular, to data transmission cables, the outer covering and / or an inner supporting and separating structure consisting of the shielding film in one of the embodiments discussed above. The outer enclosure protects the overall environment against against emitted from the cable energies and existing in the cable transmission elements, for example in the form of several twisted pairs, against irradiated interference energy. In particular, the latter aspect is of particular importance in the application of 10GB Ethernet on copper data transmission cables. Namely, the so-called "cable crosstalk" - also referred to as alien NEXT or alien EL-FEXT - drastically reduced by the outer sheath.

Das kabelinterne Übersprechen zwischen den einzelnen twisted pairs wird durch die Integration der Abschirmfolie in eine innere Stütz- und Separierstruktur, wie sie beispielsweise durch Falten der Abschirmfolie in eine im Profil vierarmige Sternkonfiguration erfolgen kann, drastisch verringert. Aufgrund der Flexibilität der Abschirmfolie kann diese praktisch in beliebige Konfigurationen gelegt und an unterschiedlichste Leitungsbelegungen innerhalb des Kabels angepasst werden. Eine Vielzahl von Beispielen, bei denen jedoch nirgends eine Abschirmfolie mit in Längsrichtung unterbrochener Abschirmlage eingesetzt wird, ist unter anderem den Druckschriften US 6 624 359 B2, US 2003/0217863 A1 oder EP 0 915 486 A1 entnehmbar.The internal crosstalk between the individual twisted pairs is achieved by integrating the shielding foil into an inner supporting and separating structure, such as, for example, by folding the shielding foil into an inlay Profile four-armed star configuration can be drastically reduced. Due to the flexibility of the shielding film, it can be placed in virtually any configuration and adapted to a wide variety of line assignments within the cable. A large number of examples in which, however, nowhere a shielding foil with a shielding layer interrupted in the longitudinal direction is used can be taken from, inter alia, the documents US Pat. No. 6,624,359 B2, US 2003/0217863 A1 or EP 0 915 486 A1.

Weitere Merkmale, Einzelheiten und Vorteile sind der nachfolgenden Beschreibung entnehmbar, in der Ausführungsbeispiele der Erfindung anhand der beigefügten Zeichnungen näher erläutert werden. Es zeigen:

Fig. 1
eine teilweise weggebrochene, perspektivische Schemaansicht einer mehrlagigen Abschirmfolie in einer ersten Ausführungsform,
Fig. 2 und 3
analoge Ansichten einer Abschirmfolie in einer zweiten und dritten Ausführungsform,
Fig. 4 und 5
einen Querschnitt und eine perspektivische Ansicht einer in einem Datenübertragungskabel verwendbaren inneren Stütz- und Separierstruktur in höchst schematischer Darstellung,
Fig. 6
eine höchst schematische Perspektivansicht eines Datenübertragungskabels in einer ersten Ausführungsform,
Fig. 7
eine Darstellung analog Fig. 6 eines Datenübertragungskabels in einer zweiten Ausführungsform sowie
Fig. 8 und 9
höchst schematische perspektivische Darstellungen von Datenübertragungskabeln mit integrierten, teilweise auf sich gelegten Abschirmfolien.
Further features, details and advantages of the following description can be removed, will be explained in more detail in the embodiments of the invention with reference to the accompanying drawings. Show it:
Fig. 1
a partially broken, perspective schematic view of a multilayer shielding film in a first embodiment,
FIGS. 2 and 3
Analogous views of a shielding film in a second and third embodiment,
4 and 5
a cross-sectional and a perspective view of usable in a data transmission cable inner support and Separierstruktur in highly schematic representation,
Fig. 6
a highly schematic perspective view of a data transmission cable in a first embodiment,
Fig. 7
a representation analogous to FIG. 6 of a data transmission cable in a second embodiment and also
8 and 9
highly schematic perspective views of data transmission cables with integrated, partly on-set shielding.

Aus Fig. 1 wird der Grundaufbau einer mehrlagigen, streifenförmigen Abschirmfolie 1 deutlich. Diese weist eine erste Trägerlage 2 aus einem durchgehenden, streifenförmigen Kunststoffmaterial, wie vorzugsweise Polyester, einer Dicke von 9 bis 50 µm auf. Darauf ist eine Abschirmlage 3 kaschiert, die aus einzelnen Metallfolienstücken 4 besteht, die durch einen Abstandsspalt 5 voneinander getrennt sind. Diese rechteckigen Folienstücke weisen eine typische Länge L in Streifenlängsrichtung Z auf, die 60 bis 120 mm beträgt. Die Spaltbreite D in Streifenlängsrichtung Z beträgt typischer Weise etwa 5 bis 10 mm, so dass das Maßverhältnis von Spaltbreite D zu Länge L der Folienstücke 4 zwischen 1:5 und 1:25 liegt. Die Breite der Folienstücke 4 ist etwas geringer als die der Trägerlage 2, so dass die Längsränder 6 der Trägerlage 2 über die Längsränder 7 der Abschirmlage 3 um einige Millimeter hinausragen. Die Metallfolie der Abschirmlage 3 besteht vorzugsweise aus Aluminium mit einer Schichtdicke zwischen 5 und 50 µm.From Fig. 1, the basic structure of a multi-layer, strip-shaped shielding 1 is clear. This has a first carrier layer 2 of a continuous, strip-shaped plastic material, such as preferably polyester, a thickness of 9 to 50 microns. Then a shielding layer 3 is laminated, which consists of individual metal foil pieces 4, which are separated by a gap 5 from each other. These rectangular pieces of film have a typical length L in the strip longitudinal direction Z, which is 60 to 120 mm. The gap width D in strip longitudinal direction Z is typically about 5 to 10 mm, so that the measurement ratio of gap width D to length L of the film pieces 4 is between 1: 5 and 1:25. The width of the film pieces 4 is slightly smaller than that of the carrier layer 2, so that the longitudinal edges 6 of the carrier layer 2 protrude beyond the longitudinal edges 7 of the shielding layer 3 by a few millimeters. The metal foil of the shielding layer 3 is preferably made of aluminum with a layer thickness between 5 and 50 microns.

Auf die Abschirmlage 3 ist eine weitere Trägerlage 8 kaschiert, so dass eine Art Foliensandwich entsteht. Die Trägerlage 8 ist aus dem gleichen Material wie die Trägerlage 2 und wird im Bereich der über die Abschirmlage 3 seitlich hinausstehenden Längsränder mit der unteren Trägerlage 2 fest verbunden. Damit ist die Abschirmlage 3 hermetisch nach außen abgeschlossen.On the shielding layer 3, a further carrier layer 8 is laminated, so that a kind of film sandwich is formed. The carrier layer 8 is made of the same material as the carrier layer 2 and is fixedly connected to the lower carrier layer 2 in the region of the longitudinal edges protruding laterally beyond the shielding layer 3. Thus, the shielding layer 3 is hermetically sealed to the outside.

Die dauerhafte Verbindung der drei Lagen 2, 3, 8 erfolgt durch geeignete Klebermaterialien, die auf dem Gebiet von Kaschierfolien üblich sind. Die Trägerlage 2 kann aus Herstellungs- und Stabilitätsgründen mehrschichtig aus einem einheitlichen Material aufgebaut sein.The permanent connection of the three layers 2, 3, 8 takes place by means of suitable adhesive materials, which are customary in the field of laminating films. The carrier layer 2 can be made of a uniform material for manufacturing and stability reasons multi-layered.

Wie in Fig. 1 nicht näher dargestellt ist, kann statt der seitlich hinausstehenden Längsränder der beiden Trägerlagen 2, 8 auch die obere Trägerlage 8 mit ihrem Längsrand 6 bündig mit dem Längsrand der Metallfolienstücke 4 enden, so dass bei einem Wickeln der Abschirmfolie 1 um entsprechende Leitungen, wie dies im Folgenden noch anhand der Fig. 6 bis 9 näher erörtert wird, die überlappenden Längsränder der Abschirmfolie 1 im Überdeckungsbereich nicht so stark auftragen.As shown in Fig. 1 is not shown in detail, instead of the laterally projecting longitudinal edges of the two carrier layers 2, 8 and the upper carrier layer 8 ends with its longitudinal edge 6 flush with the longitudinal edge of the metal foil pieces 4, so that when winding the shielding film 1 to corresponding Lines, as will be discussed in more detail below with reference to FIGS. 6 to 9, the overlapping longitudinal edges of the shielding film 1 in the coverage area not so strong.

In einer weiteren Ausführungsform, wie sie als Abschirmfolie 1" in den Fig. 5 bis 9 dargestellt ist, können die Längsränder 6 der Trägerlagen 2, 8 und die Längsränder 7 der Abschirmlage 3 auch bündig miteinander enden, so dass der Längsrand 7 der Abschirmlage 3 von außen zugänglich und erkennbar bleibt.In a further embodiment, as shown as a shielding foil 1 "in FIGS. 5 to 9, the longitudinal edges 6 of the carrier layers 2, 8 and the longitudinal edges 7 of the shielding layer 3 can also end flush with each other, so that the longitudinal edge 7 of the shielding layer 3 accessible from the outside and remains recognizable.

Die in Fig. 2 gezeigte Ausführungsform der Abschirmfolie 1' unterscheidet sich von der Variante gemäß Fig. 1 lediglich im Verlauf der Abstandsspalte 5. Diese sind nicht streng rechtwinklig zur Streifenlängsrichtung Z angeordnet, sondern verlaufen in einem kleinen spitzen Winkel W zur Streifenquerrichtung X. Die Richtungen dieses Schrägverlaufes sind von Abstandsspalt 5 zu Abstandsspalt 5 derart entgegengesetzt, dass die Folienstücke 4 zwischen zwei benachbarten Abstandsspalten 5 in Draufsicht trapezförmig ausgestaltet sind.The embodiment of the shielding film 1 'shown in FIG. 2 differs from the variant according to FIG. 1 only in the course of the gap gaps 5. These are not arranged strictly perpendicular to the strip longitudinal direction Z, but extend at a small acute angle W to the strip transverse direction X. Directions of this oblique course of the distance gap 5 to distance gap 5 are opposite to such that the film pieces 4 are designed trapezoidal between two adjacent spacing columns 5 in plan view.

In einer weiteren Variante gemäß Fig. 3 sind diese Abstandsspalten zwar in einem kleinen spitzen Winkel W zur Streifenquerrichtung X angeordnet, bei dieser Abschirmfolie 1''' jedoch parallel zueinander. Damit sind die Folienstücke 4 zwischen zwei benachbarten Abstandsspalten 5 in Draufsicht parallelogrammförmig ausgestaltet.In a further variant according to FIG. 3, these spacing gaps are arranged at a small acute angle W to the strip transverse direction X, but in this shielding film 1 '"they are arranged parallel to one another. Thus, the film pieces 4 are configured parallelogram in plan view between two adjacent spacing columns 5 in plan view.

Bezüglich aller weiteren Details der Ausführungsfbrmen gemäß Fig. 2 und 3 kann auf die Beschreibung der Fig. 1 Bezug genommen werden, wo identische Bauteile mit übereinstimmenden Bezugszeichen versehen sind.With respect to all other details of the Ausführungsfbrmen of FIG. 2 and 3, reference can be made to the description of Fig. 1, where identical components are provided with identical reference numerals.

Die vorstehend beschriebenen Abschirmfolien 1, 1', 1", 1''' können nun in unterschiedlichsten Konfigurationen in elektrischen Kabeln und insbesondere Hochgeschwindigkeits-Datenübertragungskabeln 15 eingesetzt werden. So zeigen die Figuren 4 und 5 eine innere Stütz- und Separierstruktur 9 ― einen sogenannten "Spline" -, bei dem die Abschirmfolie 1' in Streifenlängsrichtung Z auf sich selbst so gefaltet ist, dass vier sternförmig ausgerichtete Separierstege 10 entstehen. Dazu kann beispielsweise die innenliegende Trägerlage 2 in den sich flankierenden Bereichen durch geeignete Klebstoffe fixiert werden. Am linken Separiersteg 10 ist der Stoß zwischen den beiden Längskanten 11 der Abschirmfolie 1' erkennbar. Wie bereits oben erwähnt, läuft hier die Abschirmlage 3 offen in die Längskante 11 aus.The shielding films 1, 1 ', 1 ", 1'" described above can now be used in a wide variety of configurations in electrical cables and in particular high-speed data transmission cables 15. Thus, FIGS. 4 and 5 show an inner supporting and separating structure 9 - a so-called "Spline" - in which the shielding film 1 'is folded onto itself in the longitudinal direction Z of the strip in such a way that four star-shaped separating webs 10 are formed For this purpose, for example, the inner carrier layer 2 can be fixed in the flanking regions by suitable adhesives 10, the impact between the two longitudinal edges 11 of the shielding film 1 'can be seen. As already mentioned above, here the shielding layer 3 runs open into the longitudinal edge 11.

In den zwischen den Separierstegen 10 gebildeten Quadrantenzonen 12 werden, wie in Fig. 6 dargestellt ist, jeweils Twisted-pair-Leitungen 13 untergebracht, die somit voneinander durch die in den Separierstegen 10 vorhandene Abschirmlage 3 voneinander abgeschirmt sind. Die gesamte Anordnung aus innerer Stütz- und Separierstruktur 9 und den vier Twisted-pair-Leitungen 13 wird durch eine äußere Umhüllung 14 abgeschlossen, die ebenfalls wieder aus einer Abschirmfolie 1" besteht. Diese streifenförmige Abschirmfolie wird zu einem Schlauch umgefaltet und im Bereich ihrer überlappenden Längskanten 11 miteinander beispielsweise verschweißt. Damit ist die gesamte Leitungsanordnung 15 auch nach außen hin komplett abgeschirmt.In the quadrant zones 12 formed between the Separierstegen 10 are, as shown in Fig. 6, each housed twisted-pair lines 13, which are thus shielded from each other by the present in the Separierstegen 10 shielding layer 3 from each other. The entire arrangement of inner supporting and separating structure 9 and the four twisted pair lines 13 is closed by an outer casing 14, which likewise consists again of a shielding film 1 ".This strip-shaped shielding film is folded over into a tube and, for example, welded together in the region of its overlapping longitudinal edges 11. Thus, the entire line arrangement 15 is also completely shielded towards the outside.

In den Fig. 5 und 6 ist im Übrigen der Schrägverlauf der Abstandsspalte 5 angedeutet. Es wird erkennbar, dass die Enden der Abstandsspalte 5 in Streifenlängsrichtung Z zueinander versetzt angeordnet sind. Durch den helixförmigen Verlauf der Abstandsspalte 5 wird eine über den Kabelquerschnitt durchgehende Einstrahlebene für elektromagnetische Strahlung vermieden.In the Figs. 5 and 6, the oblique course of the gap 5 is indicated, moreover. It can be seen that the ends of the gap gaps 5 are arranged offset in the strip longitudinal direction Z to each other. Due to the helical course of the gap 5, a continuous over the cable cross-section irradiation level for electromagnetic radiation is avoided.

Bei der in Fig. 7 gezeigten Ausführungsform ist das Datenübertragungskabel 15' zwar wieder mit der äußeren geschirmten Umhüllung 14 analog dem Ausführungsbeispiel nach Fig. 6 versehen, die innere Stütz- und Separierstruktur ist jedoch ein übliches Kreuzprofil 16, das aus einem isolierenden Kunststoff extrudiert ist. Ferner ist in Fig. 7 ― auch stellvertretend für die Ausführungen gemäß Fig. 6, 8 und 9 - ausschnittsweise ein äußerer Schutzmantel 17 aus einem polymeren Isoliermaterial dargestellt, der das Datenübertragungskabel 15" nach außen mechanisch abschließt. Dazu umhüllt der Schutzmantel 17 die als - wie dargestellt - längslaufender Schlauch oder auch als helixartige Wicklung aufgebrachte Abschirmfolie 1" und ist mit dieser über eine optional vorgesehene Klebeschicht 18 gegebenenfalls fest verbunden. In diesem Falle werden bei der Installation des Kabels 15' dessen Abisolieren und das Freilegen der Leitungen 13 erleichtert, indem mit dem Entfernen des äußeren Schutzmantels 17 dann auch gleichzeitig die Abschirmfolie 1" mit abgezogen wird.In the embodiment shown in FIG. 7, although the data transmission cable 15 'is again provided with the outer shielded sheath 14 analogous to the embodiment of FIG. 6, the inner support and separation structure is a common cross profile 16 extruded from an insulating plastic , Furthermore, an outer protective sheath 17 made of a polymeric insulating material which partially closes off the data transmission cable 15 "to the outside is shown in FIG. 7 - also representative of the embodiments according to FIGS. 6, 8 and 9. as shown - longitudinal tube or as a helical winding applied shielding 1 "and is optionally permanently connected thereto via an optionally provided adhesive layer 18. In this case, during the installation of the cable 15 'whose stripping and the exposure of the lines 13 is facilitated by the removal of the outer protective jacket 17 then at the same time the shielding foil 1 "is deducted.

Als weitere Variante kann dann noch ein innerer Schutzmantel 19 eingesetzt werden, der auf das Kabelgrundelement mit dem Kreuzprofil 16 und den vier Paaren von Twisted-pair-Leitungen 13 aufgebracht ist. Darauf wird dann die Abschirmfolie 1 " längslaufend oder gewickelt aufgebracht und mit dem Schutzmantel 17 mit Klebeschicht 18 ergänzt.As a further variant, an inner protective jacket 19 can then also be used, which is applied to the cable base element with the cross profile 16 and the four pairs of twisted-pair lines 13. Then the shielding film 1 "is applied longitudinally wound or wound and supplemented with the protective jacket 17 with adhesive layer 18.

Bei der in Fig. 8 gezeigten Ausführungsform eines Datenübertragungskabels 15" wird eine sehr breite Abschirmfolie 1" so formgerecht teilweise auf sich selbst gefaltet, dass die vier Twisted-pair-Leitungen 13 jeweils nach außen und im Inneren von der Abschirmfolie 1" umgeben sind. Diese im Querschnitt "ornamentale", mäanderförmige Umhüllung der Twisted-Pair-Leitungen dient also einer Abschirmung sowohl nach außen als auch zwischen den Leitungen 13. In Fig. 8 ist im Übrigen ― genauso wie in Fig. 9 ― eine äußere mechanische Schutzhülle der Übersichtlichkeit halber weggelassen.In the case of the embodiment of a data transmission cable 15 "shown in FIG. 8, a very wide shielding film 1" is partially folded onto itself in such a form-fitting manner that the four twisted-pair lines 13 are respectively outwardly and inwardly surrounded by the shielding film 1 ". This cross-sectionally "ornamental", meandering envelope of the twisted pair lines thus serves to shield both outwardly and between the lines 13. In FIG. 8, by the way - as in FIG. 9 - an outer mechanical protective cover is clearly arranged omitted.

In der erwähnten Fig. 9 werden zwei Abschirmfolien 1" jeweils s-förmig um zwei benachbarte Twisted-pair-Leitungen 13 gelegt, so dass auch hier eine externe und interne Abschirmung der Leitungen 13 gewährleistet ist.In the above-mentioned FIG. 9, two shielding foils 1 "are each laid in an S-shape around two adjacent twisted-pair lines 13, so that here too an external and internal shielding of the lines 13 is ensured.

Claims (13)

Mehrlagige, streifenförmige Abschirmfolie für elektrische Leitungen, insbesondere für mehradrige Datenübertragungskabel, umfassend - mindestens eine Trägerlage (2, 8) aus einem Kunststoff und - mindestens eine auf die Trägerlage (2, 8) kaschierte Abschirmlage (3) aus einem elektrisch leitfähigen Material, insbesondere aus Metall,
gekennzeichnet durch - quer zu einer Streifenlängsrichtung (Z) verlaufende, in Längsabständen (p) wiederkehrende Abstandsspalte (5) in der Abschirmlage (3) zu deren elektrischer Unterbrechung in Streifenlängsrichtung (Z). Multi-layer, strip-shaped shielding foil for electrical lines, in particular for multicore data transmission cables - At least one carrier layer (2, 8) made of a plastic and at least one shielding layer (3) laminated on the carrier layer (2, 8) and made of an electrically conductive material, in particular of metal,
marked by - Transversely to a strip longitudinal direction (Z) extending, in longitudinal intervals (p) recurring distance gaps (5) in the shielding layer (3) for their electrical interruption in strip longitudinal direction (Z). Abschirmfolie nach Anspruch 1, dadurch gekennzeichnet, dass die Abstandsspalte (5) in periodischen Abständen (p) wiederkehren.Shielding foil according to claim 1, characterized in that the spacing gaps (5) recur at periodic intervals (p). Abschirmfolie nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Maßverhältnis von Abstandsspaltbreite (D) zur Länge (L) der zwischen den Abstandsspalten (5) verbleibenden Folienstücken (4) zwischen 1:5 und 1:25 beträgt.Shielding foil according to claim 1 or 2, characterized in that the measurement ratio of gap width (D) to the length (L) of the gap between the gaps (5) remaining pieces of foil (4) is between 1: 5 and 1:25. Abschirmfolie nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass die Abstandsspalte (5) in einem spitzen Winkel (W) zur Streifenquerrichtung (X) verlaufen.Shielding foil according to one of the preceding claims, characterized in that the spacing gaps (5) extend at an acute angle (W) to the strip transverse direction (X). Abschirmfolie nach Anspruch 4, dadurch gekennzeichnet, dass zwei aufeinanderfolgende Abstandsspalte (5) derart in entgegengesetzte oder zueinander parallele Winkelrichtungen zur Streifenquerrichtung (X) verlaufen, dass die dazwischen verbleibenden Folienstücke (4) trapez- oder parallelogrammförmig sind.Shielding foil according to claim 4, characterized in that two successive spacing gaps (5) run in opposite or mutually parallel angular directions to the transverse direction of the strip (X) in such a way that the pieces of foil (4) remaining between them are trapezoidal. or are parallelogram-shaped. Abschirmfolie nach einem der vorgenannten Ansprüche, dadurch gekennzeichnet, dass eine Abschirmlage (5) zwischen zwei Trägerlagen (2, 8) einlaminiert ist.Screening sheet according to any one of the preceding claims, characterized in that a shielding layer (5) between two carrier layers (2, 8) is laminated. Abschirmfolie nach Anspruch 6, dadurch gekennzeichnet, dass die Längsränder (2) der Trägerlagen (2, 8) über die Längsränder (7) der Abschirmlage (3) hinausstehen.Screening sheet according to claim 6, characterized in that the longitudinal edges (2) of the carrier layers (2, 8) project beyond the longitudinal edges (7) of the shield layer (3). Elektrisches Kabel, insbesondere Datenübertragungskabel (15, 15', 15"), mit mindestens einer Leitung, insbesondere mit mehreren verdrillten Paar-Leitungen (13),
gekennzeichnet durch - eine äußere Umhüllung (14) bestehend aus einer Abschirmfolie (1, 1', 1", 1''') nach einem der vorgenannten Ansprüche 1 bis 7. Electrical cable, in particular data transmission cable (15, 15 ', 15 "), having at least one line, in particular having a plurality of twisted pair lines (13),
marked by - An outer sheath (14) consisting of a shielding film (1, 1 ', 1 ", 1''') according to one of the preceding claims 1 to 7. Elektrisches Kabel nach Anspruch 8, dadurch gekennzeichnet, dass die äußere Umhüllung (14) von einem Schutzmantel (17) umgeben ist.Electrical cable according to claim 8, characterized in that the outer sheath (14) is surrounded by a protective sheath (17). Elektrisches Kabel nach Anspruch 9, dadurch gekennzeichnet, dass zwischen Umhüllung (14) und Schutzmantel (17) eine Klebeschicht (18) angeordnet ist.Electrical cable according to Claim 9, characterized in that an adhesive layer (18) is arranged between the sheathing (14) and protective sheath (17). Elektrisches Kabel nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass zwischen der mindestens einen Leitung (13) und der äußeren Umhüllung (14) ein Schutzmantel (19) angeordnet ist.Electrical cable according to one of claims 8 to 10, characterized in that between the at least one line (13) and the outer sheath (14) a protective sheath (19) is arranged. Elektrisches Kabel, insbesondere Datenübertragungskabel (15, 15', 15"), mit mindestens einer Leitung, insbesondere mit mehreren verdrillten Paar-Leitungen (13),
gekennzeichnet durch
eine innere Stütz- und Separierstruktur (9) bestehend aus einer Abschirmfolie (1, 1', 1", 1''') nach einem der vorgenannten Ansprüche 1 bis 7.Electrical cable, in particular data transmission cable (15, 15 ', 15 "), having at least one line, in particular having a plurality of twisted pair lines (13),
marked by
an inner support and separating structure (9) consisting of a shielding film (1, 1 ', 1 ", 1''') according to one of the preceding claims 1 to 7. Elektrisches Kabel nach Anspruch 12, dadurch gekennzeichnet, dass die innere Stütz- und Separierstruktur (9) aus einer zumindest teilweise auf sich selbst in Längsrichtung gefalteten Abschirmfolie (1, 1', 1", 1''') besteht.Electrical cable according to claim 12, characterized in that the inner supporting and separating structure (9) consists of a shielding film (1, 1 ', 1 ", 1''') folded at least partially in itself in the longitudinal direction.
EP05009884A 2004-09-03 2005-05-06 Multilayer striplike shielding film for data transmission cables and data transmission cable equipped therewith Active EP1632957B1 (en)

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DE102004042656A DE102004042656B3 (en) 2004-09-03 2004-09-03 Multi-layer, strip-shaped shielding foil for electrical lines and thus equipped electrical cable, in particular data transmission cable

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TWI367500B (en) 2012-07-01
ES2390712T3 (en) 2012-11-15
KR101253780B1 (en) 2013-04-12
CN1744235A (en) 2006-03-08
KR20060050977A (en) 2006-05-19
DE102004042656B3 (en) 2005-12-29
JP2006073534A (en) 2006-03-16
TW200614274A (en) 2006-05-01
US7335837B2 (en) 2008-02-26
US20060048961A1 (en) 2006-03-09
EP1632957B1 (en) 2012-07-04
CN1744235B (en) 2011-03-16

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