EP1619694B1 - Insulated electrical conductor with preserved functionality in case of fire - Google Patents

Insulated electrical conductor with preserved functionality in case of fire Download PDF

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Publication number
EP1619694B1
EP1619694B1 EP04291877A EP04291877A EP1619694B1 EP 1619694 B1 EP1619694 B1 EP 1619694B1 EP 04291877 A EP04291877 A EP 04291877A EP 04291877 A EP04291877 A EP 04291877A EP 1619694 B1 EP1619694 B1 EP 1619694B1
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EP
European Patent Office
Prior art keywords
tape
conductor
layer
plastic
overlap
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Not-in-force
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EP04291877A
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German (de)
French (fr)
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EP1619694A1 (en
Inventor
Ferdinand Grögl
Joachim Uttinger
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Nexans SA
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Nexans SA
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Priority to EP04291877A priority Critical patent/EP1619694B1/en
Priority to PL04291877T priority patent/PL1619694T3/en
Publication of EP1619694A1 publication Critical patent/EP1619694A1/en
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Publication of EP1619694B1 publication Critical patent/EP1619694B1/en
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    • 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
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/04—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances mica
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0241—Disposition of insulation comprising one or more helical wrapped layers of insulation
    • 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
    • H01B7/02—Disposition of insulation
    • H01B7/0258—Disposition of insulation comprising one or more longitudinal lapped layers of insulation

Definitions

  • the invention relates to an insulated electrical conductor with functional integrity in the event of fire, consisting of a metallic conductor, a glass / mica layer applied to the conductor and a plastic layer surrounding it, in which the glass / mica layer consists of two superposed bands, one first band, the mica layer of which bears against the conductor, and a second band, the width of which is in each case selected such that their edges overlap one another ( DE 100 51 962 A1 ).
  • glass / mica stands for example for a structure of a carrier tape in the form of an open glass fabric with warp and weft threads, which is adhesively coated on one side with mica.
  • a bonding agent between the glass fabric and the mica silicone is used with advantage.
  • insulated conductors are intended for cables or cables that are used to power any consumer and / or for communication in buildings.
  • This requirement means that the cables or cables still retain their function in the event of a fire for a predefinable period of time. A fire burns all flammable materials of the cables or cables. It remains only for a limited period surrounding the conductor glass / mica layer as insulation, which prevents a short circuit with other conductors, a screen or other metal parts.
  • the well-known conductor after the aforementioned DE 100 51 962 A1 is surrounded by a two-band glass / mica layer, both longitudinally incoming are formed with overlapping edges around the conductor. The overlap is at least 50% and the overlap locations are diametrically opposed to each other with respect to the conductor. It is thus easily produced a three-layer glass / mica layer. Such a conductor is sufficient for all functional requirements. However, it can happen in unfavorable cases that the glass / mica layer is mechanically damaged in case of fire at a very high tensile load and associated elongation.
  • the invention has for its object to improve the mechanical stability of the above-described conductor and its electrical safety.
  • the two glass / mica bands provide an overall insulating layer of the conductor which contains sufficient material to effectively insulate the conductor, at least for a prolonged period, even in the event of fire, thereby ensuring its operability for that period.
  • the mechanical strength of the conductor or its insulation against tensile loads is increased by the fact that the second band is wrapped around the first band overlapping.
  • the conductor With the two bands of the glass / mica layer, the conductor has a mechanically stable insulation, which is effective in case of fire at least for the given period of time.
  • This electrical safety is further increased by the plastic layer, through the residual layer of the conductor in case of fire surrounding insulating layer is additionally thickened. This ensures, in any case, a sufficient distance to adjacent conductors, in a two or more conductors having lead, to a screen of such a line or to other metal parts, which meets all electrical requirements, such as dielectric strength, insulation resistance and operating capacity.
  • the plastic layer may be colored differently for different conductors, so that the individual conductors of a multi-conductor line are easy to identify. It may be realized by a plastic tape provided with a heat-sealable layer or by a cross-linked silicone coating.
  • An in Fig. 1 1, designated electrical conductor is preferably made of copper.
  • the conductor 1 may be a strand of individual wires. It can also be designed as a solid wire.
  • a first band 2 made of glass / mica is attached, which is longitudinally formed with overlapping edges around the conductor 1 around.
  • the mica layer of the band 2 faces the conductor 1.
  • the overlap area 3 is in Fig. 1 drawn, limited by a solid line and a dashed line.
  • the overlap is advantageously between 25% and 50%, based on the width of the strip 2.
  • a second strip 4 of glass / mica is wound in an overlapping manner, the mica layer of which faces the first strip 2.
  • the overlap is here also advantageously between 25% and 50%, again based on the width of the belt 4.
  • a plastic tape 6 to be wrapped around overlapping, which is provided on one side with a layer of heat-sealable material.
  • the layer of heat-sealable material is advantageously applied to the second band 4. It then ensures after appropriate heat supply for bonding the overlapping edges of the second band 4.
  • the overlap is advantageously between 25% and 50%, based on its width.
  • the plastic strip 6 may consist of a highly flame-retardant plastic, such as polyamide imide or PEEK.
  • the material of the heat-sealable layer can a copolymer based on ethylene acrylic acid acrylate (EAA) or ethylene methacrylic acid ester (EMA), which melts in a temperature range of about 100 ° C to 200 ° C.
  • EAA ethylene acrylic acid acrylate
  • EMA ethylene methacrylic acid ester
  • the total thickness of such a plastic strip 6 is between 50 microns and 100 microns.
  • the plastic strip 6 can also be a synthetic fiber nonwoven fabric, which can consist of a thermally bonded polyamide-imide nonwoven fabric which is laminated with a heat-sealable plastic copolymer film with a thickness of> 15 ⁇ m.
  • the total thickness of such a plastic strip 6 is between 80 .mu.m and 100 .mu.m.
  • plastic band 6 is a woven or nonwoven ribbon of inorganic material, for example of glass fibers or ceramic fibers, which is laminated with a heat-sealable copolymer film having a thickness of> 15 ⁇ m.
  • the total thickness of such a plastic strip 6 is between 100 microns and 150 microns.
  • the plastic band 6 is preferably wound with the second band 4 opposite winding direction, as in Fig. 1 is shown. But it can also be wound up with the same winding direction as the second band 4.
  • the plastic layer 5 can according to Fig. 2 also be a shell 7 made of cross-linked silicone. It is then applied with a suitable coating device completely on the second band 4.
  • the silicone can be applied in liquid form in a continuous process, for example with a layer thickness between 0.15 mm and 0.8 mm.
  • the silicone can then be crosslinked by means of IR or UV rays.
  • the liquid silicone may be mixed to improve its mechanical properties and fire properties and powder and / or short fibers of glass / quartz or ceramic.
  • the leader after Fig. 1 is made, for example, as follows:
  • a metallic conductor 1 is withdrawn from a supply spool 8 and fed to a forming device 9, in which a first, consisting of glass / mica tape 2 is formed langein secured around the conductor 1. Its mica layer is facing the conductor 1.
  • the tape 2 is to be deducted from a supply spool 10.
  • the width of the band 2 is dimensioned so that an overlap of his Margins of about 25% to 50%, based on its width.
  • the second, glass / mica-containing band 4 is wound around the first band 2 with a winding device 11 so that the first band 2 is held and stabilized in its shape given by the shaping device 9.
  • the mica layer of the second band 4 is preferably applied to the band 2.
  • the provided with a heat-sealable layer plastic tape 6 is then wound up.
  • the heat-sealable layer may face the second band 4. But it can also be outside.
  • the so surrounded by three layers conductor 1 is then pulled through a heating system 13, in which the heat-sealable layer is brought into its sealable state.
  • the overlapping areas of the plastic strip 6 and possibly also the second strip 4 are glued together.
  • the completely insulated conductor can be wound onto a reel 14 or fed to further processing.
  • the sheath 7 is applied from silicone, which is then crosslinked, for example by IR or UV radiation. This conductor can also be wound up or fed to a further processing.
  • wire A The insulated conductor after the Fig. 1 or 2 - hereinafter referred to as "wire A" in short, can be used as a single element in principle.
  • a core A is arranged in a preferred embodiment with at least one further wire A in a line L or a cable.
  • a line L is in cross section, for example in Fig. 4 shown. It has in this embodiment, four stranded together wires A.
  • the wires A are, for example, twisted together to form a star quad.
  • the plastic bands 6 or the sheath 7 of the wires A of a line L can all be colored differently.
  • a glass silk tape or glass / mica tape 15 which is wrapped around the unit with overlapping edges.
  • the Band 15 is surrounded by a one-sided plastic-laminated shielding metal band 16 which is wrapped inwardly around its circumference with metal side or circumferentially around it.
  • the metal strip 16 is, for example, a polyester tape laminated with copper.
  • an existing Beidraht 17 consisting of copper may advantageously be arranged, which is preferably wound with the Verseilschlag the four wires A helically around the band 15.
  • the two-wire 17 ensures the permanent through-connection of the metal strip 16.
  • the band 16 is surrounded by a jacket 18 made of a flame-retardant, halogen-free polymer-based insulating material. It is preferably extruded onto the belt 16.

Description

Die Erfindung betrifft einen isolierten elektrischen Leiter mit Funktionserhalt im Brandfall, bestehend aus einem metallischen Leiter, einer auf den Leiter aufgebrachten Glas/Glimmer-Schicht und einer dieselbe umgebenden Kunststoffschicht, bei welchem die Glas/Glimmer-Schicht aus zwei übereinander liegenden Bändern besteht, einem ersten Band, dessen Glimmerschicht am Leiter anliegt, und einem zweiten Band, deren Breite jeweils so gewählt ist, daß ihre Ränder einander überlappen ( DE 100 51 962 A1 ).The invention relates to an insulated electrical conductor with functional integrity in the event of fire, consisting of a metallic conductor, a glass / mica layer applied to the conductor and a plastic layer surrounding it, in which the glass / mica layer consists of two superposed bands, one first band, the mica layer of which bears against the conductor, and a second band, the width of which is in each case selected such that their edges overlap one another ( DE 100 51 962 A1 ).

Die Bezeichnung "Glas/Glimmer" steht beispielsweise für ein Gebilde aus einem Trägerband in Form eines offenen Glasgewebes mit Kett- und Schußfäden, das festhaftend einseitig mit Glimmer beschichtet ist. Als Haftvermittler zwischen dem Glasgewebe und dem Glimmer ist mit Vorteil Silikon eingesetzt. Mit einem derartigen Material isolierte Leiter sind für Leitungen bzw. Kabel bestimmt, die zur Stromversorgung beliebiger Verbraucher und/oder zur Nachrichtenübertragung in Gebäuden eingesetzt sind. Unabhängig von der Vorgabe, daß die Leiter bzw. die mit denselben ausgerüsteten Leitungen und Kabel nicht komplett bis zum Leiter abbrennen dürfen und im Brandfall möglichst wenig Rauch entwickeln, besteht auch eine sogenannte Notlaufforderung. Diese Forderung bedeutet, daß die Leitungen bzw. Kabel im Brandfall ihre Funktion noch für eine vorgebbare Zeitdauer beibehalten. Durch ein Feuer verbrennen alle brennbaren Materialien der Leitungen bzw. Kabel. Es verbleibt lediglich für einen begrenzten Zeitraum eine den Leiter umgebende Glas/Glimmer-Schicht als Isolierung, die einen Kurzschluß mit anderen Leitern, einem Schirm oder anderen Metallteilen verhindert.The term "glass / mica" stands for example for a structure of a carrier tape in the form of an open glass fabric with warp and weft threads, which is adhesively coated on one side with mica. As a bonding agent between the glass fabric and the mica silicone is used with advantage. With such a material insulated conductors are intended for cables or cables that are used to power any consumer and / or for communication in buildings. Regardless of the requirement that the conductors or the cables and cables equipped with them are not allowed to burn completely to the conductor and develop as little smoke as possible in case of fire, there is also a so-called emergency running requirement. This requirement means that the cables or cables still retain their function in the event of a fire for a predefinable period of time. A fire burns all flammable materials of the cables or cables. It remains only for a limited period surrounding the conductor glass / mica layer as insulation, which prevents a short circuit with other conductors, a screen or other metal parts.

Der bekannte Leiter nach der eingangs erwähnten DE 100 51 962 A1 ist von einer aus zwei Bändern bestehenden Glas/Glimmer-Schicht umgeben, die beide längseinlaufend mit überlappenden Rändern um den Leiter herumgeformt sind. Die Überlappung beträgt mindestens 50 % und die Überlappungsstellen liegen einander bezüglich des Leiters diametral gegenüber. Es wird so auf einfache Weise eine dreilagige Glas/Glimmer-Schicht erzeugt. Ein derartiger Leiter genügt allen zum Funktionserhalt gestellten Anforderungen. Es kann aber in ungünstigen Fällen geschehen, daß die Glas/Glimmer-Schicht im Brandfall bei einer sehr hohen Zugbelastung und damit verbundener Dehnung mechanisch beschädigt wird.The well-known conductor after the aforementioned DE 100 51 962 A1 is surrounded by a two-band glass / mica layer, both longitudinally incoming are formed with overlapping edges around the conductor. The overlap is at least 50% and the overlap locations are diametrically opposed to each other with respect to the conductor. It is thus easily produced a three-layer glass / mica layer. Such a conductor is sufficient for all functional requirements. However, it can happen in unfavorable cases that the glass / mica layer is mechanically damaged in case of fire at a very high tensile load and associated elongation.

Der Erfindung liegt die Aufgabe zugrunde, die mechanische Stabilität des eingangs geschilderten Leiters und seine elektrische Sicherheit zu verbessern.The invention has for its object to improve the mechanical stability of the above-described conductor and its electrical safety.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst,

  • daß das erste Band mit einer Überlappung seiner Ränder zwischen 25 % und 50 % längseinlaufend um den Leiter herumgeformt ist,
  • daß das zweite Band mit innen liegender Glimmerschicht mit einer Überlappung seiner Ränder zwischen 25 % und 50 % um das erste Band herumgewickelt ist und
  • daß die Kunststoffschicht ein im Brandfall eine Restschicht bildendes Material, vorzugsweise keramisierendes Material, enthält.
This object is achieved according to the invention characterized
  • that the first band is formed around the conductor with an overlap of its edges between 25% and 50%,
  • that the second band with internal mica layer is wound around the first band with an overlap of its edges between 25% and 50%, and
  • in that the plastic layer contains a material which forms a residual layer in case of fire, preferably a ceramizing material.

Die beiden Bänder aus Glas/Glimmer stellen mit ihren überlappenden Rändern insgesamt eine Isolierschicht des Leiters dar, die ausreichend viel Material enthält, um den Leiter auch im Brandfall zumindest für einen längeren Zeitraum wirksam zu isolieren, wodurch seine Funktionsfähigkeit für diesen Zeitraum sichergestellt ist. Die mechanische Festigkeit des Leiters bzw. seiner Isolierung gegenüber Zugbelastungen ist dadurch erhöht, daß das zweite Band um das erste Band überlappend herumgewickelt ist. Mit den beiden Bändern der Glas/Glimmer-Schicht hat der Leiter eine mechanisch stabile Isolierung, die im Brandfall zumindest für die vorgegebene Zeitdauer wirksam ist. Diese elektrische Sicherheit wird durch die Kunststoffschicht weiter erhöht, durch deren Restschicht die den Leiter im Brandfall noch umgebende Isolierschicht zusätzlich verdickt wird. Dadurch ist auf jeden Fall zu benachbarten Leitern, in einer zwei oder mehr Leiter aufweisenden Leitung, zu einem Schirm einer solchen Leitung oder zu anderen Metallteilen ein ausreichender Abstand sichergestellt, der allen elektrischen Anforderungen genügt, wie beispielsweise Spannungsfestigkeit, Isolationswiderstand und Betriebskapazität.The two glass / mica bands, with their overlapping edges, provide an overall insulating layer of the conductor which contains sufficient material to effectively insulate the conductor, at least for a prolonged period, even in the event of fire, thereby ensuring its operability for that period. The mechanical strength of the conductor or its insulation against tensile loads is increased by the fact that the second band is wrapped around the first band overlapping. With the two bands of the glass / mica layer, the conductor has a mechanically stable insulation, which is effective in case of fire at least for the given period of time. This electrical safety is further increased by the plastic layer, through the residual layer of the conductor in case of fire surrounding insulating layer is additionally thickened. This ensures, in any case, a sufficient distance to adjacent conductors, in a two or more conductors having lead, to a screen of such a line or to other metal parts, which meets all electrical requirements, such as dielectric strength, insulation resistance and operating capacity.

Die Kunststoffschicht kann für unterschiedliche Leiter unterschiedlich gefärbt sein, so daß die einzelnen Leiter einer mehrere Leiter aufweisenden Leitung leicht zu identifizieren sind. Sie kann durch ein mit einer heißsiegelfähigen Schicht versehenes Kunststoffband oder durch eine Beschichtung mit vernetztem Silikon realisiert sein.The plastic layer may be colored differently for different conductors, so that the individual conductors of a multi-conductor line are easy to identify. It may be realized by a plastic tape provided with a heat-sealable layer or by a cross-linked silicone coating.

Ausführungsbeispiele des Erfindungsgegenstandes sind in den Zeichnungen dargestellt.Embodiments of the subject invention are illustrated in the drawings.

Es zeigen:

  • Fig. 1 und 2 Ansichten eines isolierten Leiters nach der Erfindung mit abschnittsweise entfernten Schichten seiner Isolierung in zwei unterschiedlichen Ausführungsformen.
  • Fig. 3 schematisch eine Vorrichtung zur Herstellung des Leiters nach Fig. 1
  • Fig. 4 einen Querschnitt einer Leitung mit mehreren Leitern nach Fig. 1 oder 2.
Show it:
  • Fig. 1 and 2 Views of an insulated conductor according to the invention with sections removed layers of its insulation in two different embodiments.
  • Fig. 3 schematically a device for producing the conductor according to Fig. 1
  • Fig. 4 a cross section of a line with multiple conductors after Fig. 1 or 2 ,

Ein in Fig. 1 mit 1 bezeichneter elektrischer Leiter besteht vorzugsweise aus Kupfer. Der Leiter 1 kann eine aus Einzeldrähten bestehende Litze sein. Er kann auch als massiver Draht ausgeführt sein. Über dem Leiter 1 ist ein erstes Band 2 aus Glas/Glimmer angebracht, das längseinlaufend mit überlappenden Rändern um den Leiter 1 herumgeformt ist. Die Glimmerschicht des Bandes 2 ist dem Leiter 1 zugewandt. Der Überlappungsbereich 3 ist in Fig. 1 eingezeichnet, und zwar begrenzt durch eine ausgezogene und eine gestrichelte Linie. Die Überlappung beträgt mit Vorteil zwischen 25 % und 50 %, bezogen auf die Breite des Bandes 2. Um das erste Band 2 ist ein zweites Band 4 aus Glas/Glimmer überlappend herumgewickelt, dessen Glimmerschicht dem ersten Band 2 zugewandt ist. Die Überlappung liegt hier mit Vorteil ebenfalls zwischen 25 % und 50 %, wieder auf die Breite des Bandes 4 bezogen.An in Fig. 1 1, designated electrical conductor is preferably made of copper. The conductor 1 may be a strand of individual wires. It can also be designed as a solid wire. Above the conductor 1, a first band 2 made of glass / mica is attached, which is longitudinally formed with overlapping edges around the conductor 1 around. The mica layer of the band 2 faces the conductor 1. The overlap area 3 is in Fig. 1 drawn, limited by a solid line and a dashed line. The overlap is advantageously between 25% and 50%, based on the width of the strip 2. Around the first strip 2, a second strip 4 of glass / mica is wound in an overlapping manner, the mica layer of which faces the first strip 2. The overlap is here also advantageously between 25% and 50%, again based on the width of the belt 4.

Um das zweite Band 4 kann gemäß Fig. 1 als Kunststoffschicht 5 ein Kunststoffband 6 überlappend herumgewickelt sein, das auf einer Seite mit einer Schicht aus heißsiegelfähigem Material versehen ist. Die Schicht aus heißsiegelfähigem Material liegt mit Vorteil am zweiten Band 4 an. Sie sorgt dann nach entsprechender Wärmezufuhr für eine Verklebung der überlappenden Ränder des zweiten Bandes 4. Auch bei dem Kunststoffband 6 liegt die Überlappung vorteilhaft zwischen 25 % und 50 %, bezogen auf seine Breite.To the second band 4 can according to Fig. 1 as a plastic layer 5, a plastic tape 6 to be wrapped around overlapping, which is provided on one side with a layer of heat-sealable material. The layer of heat-sealable material is advantageously applied to the second band 4. It then ensures after appropriate heat supply for bonding the overlapping edges of the second band 4. Also in the plastic band 6, the overlap is advantageously between 25% and 50%, based on its width.

Das Kunststoffband 6 kann aus einem hoch flammwidrigen Kunststoff bestehen, wie beispielsweise Polyamidimid oder PEEK. Das Material der heißsiegelfähigen Schicht kann ein Copolymer auf der Basis von Ethylenacrylsäureacrylat (EAA) oder Ethylenmethacrylsäureester (EMA) sein, das in einem Temperaturbereich von etwa 100 °C bis 200 °C schmilzt. Die Gesamtdicke eines solchen Kunststoffbandes 6 liegt zwischen 50 µm und 100 µm.The plastic strip 6 may consist of a highly flame-retardant plastic, such as polyamide imide or PEEK. The material of the heat-sealable layer can a copolymer based on ethylene acrylic acid acrylate (EAA) or ethylene methacrylic acid ester (EMA), which melts in a temperature range of about 100 ° C to 200 ° C. The total thickness of such a plastic strip 6 is between 50 microns and 100 microns.

Bei dem Kunststoffband 6 kann es sich auch um ein Kunststofffaservlies handeln, das aus einem thermisch verfestigten Polyamidimidvliesstoff bestehen kann, der mit einer heißsiegelfähigen Kunststoff-Copolymerfolie mit einer Dicke von > 15 µm kaschiert ist. Die Gesamtdicke eines solchen Kunststoffbandes 6 liegt zwischen 80 µm und 100 µm.The plastic strip 6 can also be a synthetic fiber nonwoven fabric, which can consist of a thermally bonded polyamide-imide nonwoven fabric which is laminated with a heat-sealable plastic copolymer film with a thickness of> 15 μm. The total thickness of such a plastic strip 6 is between 80 .mu.m and 100 .mu.m.

Als Kunststoffband 6 geeignet ist auch ein Gewebe- oder Faservliesband aus anorganischem Material, beispielsweise aus Glasfasern oder Keramikfasern, das mit einer heißsiegelfähigen Copolymerfolie mit einer Dicke von >15 µm kaschiert ist. Die Gesamtdicke eines solchen Kunststoffbandes 6 liegt zwischen 100 µm und 150 µm.Also suitable as a plastic band 6 is a woven or nonwoven ribbon of inorganic material, for example of glass fibers or ceramic fibers, which is laminated with a heat-sealable copolymer film having a thickness of> 15 μm. The total thickness of such a plastic strip 6 is between 100 microns and 150 microns.

Das Kunststoffband 6 wird vorzugsweise mit zum zweiten Band 4 entgegengesetzter Wickelrichtung aufgewickelt, so wie es in Fig. 1 dargestellt ist. Es kann aber auch mit gleicher Wickelrichtung wie das zweite Band 4 aufgewickelt werden.The plastic band 6 is preferably wound with the second band 4 opposite winding direction, as in Fig. 1 is shown. But it can also be wound up with the same winding direction as the second band 4.

Die Kunststoffschicht 5 kann gemäß Fig. 2 auch eine Hülle 7 aus vernetztem Silikon sein. Sie wird dann mit einer geeigneten Beschichtungsvorrichtung lückenlos auf das zweite Band 4 aufgebracht. Dazu kann das Silikon in liquider Form in einem Durchlaufprozeß beispielsweise mit einer Schichtdicke zwischen 0,15 mm und 0,8 mm aufgebracht werden. Das Silikon kann anschließend mittels IR- oder UV- Strahlen vernetzt werden. Dem liquiden Silikon können zur Verbesserung seiner mechanischen Eigenschaften und seiner Brandeigenschaften auch Pulver und/oder Kurzfasern aus Glas/Quarz oder Keramik beigemischt sein.The plastic layer 5 can according to Fig. 2 also be a shell 7 made of cross-linked silicone. It is then applied with a suitable coating device completely on the second band 4. For this purpose, the silicone can be applied in liquid form in a continuous process, for example with a layer thickness between 0.15 mm and 0.8 mm. The silicone can then be crosslinked by means of IR or UV rays. The liquid silicone may be mixed to improve its mechanical properties and fire properties and powder and / or short fibers of glass / quartz or ceramic.

Der Leiter nach Fig. 1 wird beispielsweise wie folgt hergestellt:The leader after Fig. 1 is made, for example, as follows:

Ein metallischer Leiter 1 wird von einer Vorratsspule 8 abgezogen und einer Formungseinrichtung 9 zugeführt, in welcher ein erstes, aus Glas/Glimmer bestehenden Band 2 längseinlaufend um den Leiter 1 herumgeformt wird. Dessen Glimmerschicht ist dabei dem Leiter 1 zugekehrt. Das Band 2 wird dazu von einer Vorratsspule 10 abgezogen. Die Breite des Bandes 2 ist so bemessen, daß sich eine Überlappung seiner Ränder von etwa 25 % bis 50 % ergibt, bezogen auf seine Breite. Unmittelbar hinter der Formungseinrichtung 9 wird mit einer Wickeleinrichtung 11 das zweite, Glas/Glimmer enthaltende Band 4 um das erste Band 2 herumgewickelt, so daß das erste Band 2 in seiner von der Formungseinrichtung 9 gegebenen Form gehalten und stabilisiert wird. Die Glimmerschicht des zweiten Bandes 4 liegt dabei vorzugsweise am Band 2 an.A metallic conductor 1 is withdrawn from a supply spool 8 and fed to a forming device 9, in which a first, consisting of glass / mica tape 2 is formed langeinlaufend around the conductor 1. Its mica layer is facing the conductor 1. The tape 2 is to be deducted from a supply spool 10. The width of the band 2 is dimensioned so that an overlap of his Margins of about 25% to 50%, based on its width. Immediately behind the shaping device 9, the second, glass / mica-containing band 4 is wound around the first band 2 with a winding device 11 so that the first band 2 is held and stabilized in its shape given by the shaping device 9. The mica layer of the second band 4 is preferably applied to the band 2.

Mit einer Wickeleinrichtung 12 wird danach das mit einer heißsiegelfähigen Schicht versehene Kunststoffband 6 aufgewickelt. Die heißsiegelfähige Schicht kann dem zweiten Band 4 zugewandt sein. Sie kann aber auch außen liegen. Der so von drei Schichten umgebene Leiter 1 wird anschließend durch eine Heizanlage 13 gezogen, in welcher die heißsiegelfähige Schicht in ihren siegelfähigen Zustand gebracht wird. Dadurch werden die Überlappungsbereiche des Kunststoffbandes 6 und gegebenenfalls auch des zweiten Bandes 4 miteinander verklebt. Nach Abkühlung kann der fertig isolierte Leiter auf eine Spule 14 aufgewickelt oder einer Weiterverarbeitung zugeführt werden.With a winding device 12, the provided with a heat-sealable layer plastic tape 6 is then wound up. The heat-sealable layer may face the second band 4. But it can also be outside. The so surrounded by three layers conductor 1 is then pulled through a heating system 13, in which the heat-sealable layer is brought into its sealable state. As a result, the overlapping areas of the plastic strip 6 and possibly also the second strip 4 are glued together. After cooling, the completely insulated conductor can be wound onto a reel 14 or fed to further processing.

Der Leiter nach Fig. 2 wird bis zum Aufwickeln des zweiten Bandes 4 ebenso wie der Leiter nach Fig. 1 hergestellt. Bei dieser Ausführungsform wird dann statt des Kunststoffbandes 6 die Hülle 7 aus Silikon aufgebracht, das anschließend vernetzt wird, beispielsweise durch IR- oder UV-Strahlung. Auch dieser Leiter kann abschließend aufgewickelt oder einer Weiterverarbeitung zugeführt werden.The leader after Fig. 2 until after the winding of the second band 4 as well as the conductor after Fig. 1 produced. In this embodiment, instead of the plastic strip 6, the sheath 7 is applied from silicone, which is then crosslinked, for example by IR or UV radiation. This conductor can also be wound up or fed to a further processing.

Der isolierte Leiter nach den Fig. 1 oder 2 - im folgenden kurz als "Ader A" bezeichnetkann prinzipiell als Einzelelement verwendet werden. Eine solche Ader A wird aber in bevorzugter Ausführungsform mit mindestens einer weiteren Ader A in einer Leitung L bzw. einem Kabel angeordnet. Eine Leitung L ist im Querschnitt beispielsweise in Fig. 4 dargestellt. Sie weist bei diesem Ausführungsbeispiel vier miteinander verseilte Adern A auf. Die Adern A sind beispielsweise zu einer als Sternvierer ausgebildeten Einheit miteinander verseilt. Damit eine einwandfreie Identifizierung der einzelnen Adern A - beispielsweise an Verbindungsstellen - auf einfache Weise möglich ist, können die Kunststoffbänder 6 oder die Hülle 7 der Adern A einer Leitung L alle unterschiedlich gefärbt sein.The insulated conductor after the Fig. 1 or 2 - hereinafter referred to as "wire A" in short, can be used as a single element in principle. However, such a core A is arranged in a preferred embodiment with at least one further wire A in a line L or a cable. A line L is in cross section, for example in Fig. 4 shown. It has in this embodiment, four stranded together wires A. The wires A are, for example, twisted together to form a star quad. Thus, a proper identification of the individual wires A - for example, at joints - in a simple manner possible, the plastic bands 6 or the sheath 7 of the wires A of a line L can all be colored differently.

Über der Einheit der vier Adern A ist ein Glasseideband oder Glas/Glimmerband 15 angeordnet, das mit überlappenden Rändern um die Einheit herumgewickelt ist. Das Band 15 ist von einem einseitig mit Kunststoff kaschierten, der Abschirmung dienenden Metallband 16 umgeben, das mit seiner Metallseite nach innen um das Band 15 herumgewickelt oder längseinlaufend um dasselbe herumgeformt ist. Das Metallband 16 ist beispielsweise ein mit Polyester kaschiertes Kupferband. Zwischen den Bändern 15 und 16 kann mit Vorteil ein aus Kupfer bestehender Beidraht 17 angeordnet sein, der vorzugsweise mit dem Verseilschlag der vier Adern A wendelförmig um das Band 15 herumgewickelt ist. Der Beidraht 17 stellt die permanente Durchverbindung des Metallbandes 16 sicher. Das Band 16 ist von einem Mantel 18 aus einem flammwidrigen, halogenfreien Isoliermaterial auf Polymerbasis umgeben. Er wird vorzugsweise auf das Band 16 aufextrudiert.Above the unit of the four cores A is disposed a glass silk tape or glass / mica tape 15 which is wrapped around the unit with overlapping edges. The Band 15 is surrounded by a one-sided plastic-laminated shielding metal band 16 which is wrapped inwardly around its circumference with metal side or circumferentially around it. The metal strip 16 is, for example, a polyester tape laminated with copper. Between the bands 15 and 16, an existing Beidraht 17 consisting of copper may advantageously be arranged, which is preferably wound with the Verseilschlag the four wires A helically around the band 15. The two-wire 17 ensures the permanent through-connection of the metal strip 16. The band 16 is surrounded by a jacket 18 made of a flame-retardant, halogen-free polymer-based insulating material. It is preferably extruded onto the belt 16.

Claims (9)

  1. An insulated electrical conductor with maintained function in case of fire, comprising a metallic conductor, a glass/mica-layer which is applied to the same, and a surro unding plastic layer, wherein the glass/mica-layer comprises two tapeswhichare super imposed, a first tape with its mic a layer a butting to the conductor and a second tape,the widthofthe tapesbeing chosen such that their edges overlap each other, characterized in
    - that the first tape (2) is formed around the metallic conductor (1) longitudinally with an overlap of 25% to 50%,
    - that the second tape (4) is wound around the first tape (2) with an overlap of 25 %to 50 % with the mic a side lying on the first tape (2) and
    - that the plastic layer (5) comprises a material which in case of fire forms a residual layer, preferably a cemarising material.
  2. Conductor according to claim 1, characterized in that the second tape (4) is surrounded by a layer (7) of crosslinked silic one.
  3. Conductor according to claim 2, characterized in that powder and/or short fibers of glass/quartz or ceramics are added to the silicone.
  4. Conductor according to claim 1, characterized in that a plastic tape (6),whichhasa heat-sealing layer, is wound around the second tape (4).
  5. Conductor according to claim 4, characterized in that the plastic tape (6)iswound around the second tape (4) with opposite direction of lay.
  6. Conductor according to claim 4, characterized in that the plastic tape (6) is wound around the second tape (4) in the same direction of lay.
  7. Line withatleasttwo conductors according to one of the claims 1 to 6, which are stranded with each other to a unit, characterized in that a tape of fiber glass/mica is wound around the unit of conductors with overlap, around which a plastic coated metaltape (16) is wound with overlap or formed in longitudinal direction, which is so urro unded by a sheath (18) of flame retardent, halogenfree insulating material
  8. Line according to claim 7, characterized in that between metal tape (16) and sheath (8) a supplementary metallic wire (17) running in longitudinal direction is provided.
  9. Line according to claim 7 or 8, characterized in that the plastic layers (5) of the two conductors have different colours.
EP04291877A 2004-07-23 2004-07-23 Insulated electrical conductor with preserved functionality in case of fire Not-in-force EP1619694B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04291877A EP1619694B1 (en) 2004-07-23 2004-07-23 Insulated electrical conductor with preserved functionality in case of fire
PL04291877T PL1619694T3 (en) 2004-07-23 2004-07-23 Insulated electrical conductor with preserved functionality in case of fire

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04291877A EP1619694B1 (en) 2004-07-23 2004-07-23 Insulated electrical conductor with preserved functionality in case of fire

Publications (2)

Publication Number Publication Date
EP1619694A1 EP1619694A1 (en) 2006-01-25
EP1619694B1 true EP1619694B1 (en) 2012-09-05

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EP04291877A Not-in-force EP1619694B1 (en) 2004-07-23 2004-07-23 Insulated electrical conductor with preserved functionality in case of fire

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EP (1) EP1619694B1 (en)
PL (1) PL1619694T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3257056B1 (en) 2015-02-10 2022-04-06 Prysmian S.p.A. Fire resistant cable
AU2016389384B2 (en) 2016-01-26 2021-03-04 Prysmian S.P.A. Fire resistive cable system
US20220013251A1 (en) * 2020-07-07 2022-01-13 James Cheng Lee Cable and manufacturing method thereof
TW202203257A (en) * 2020-07-07 2022-01-16 政 李 Cable and method of manufacturing the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573910B1 (en) * 1984-11-29 1987-06-19 Habia Cable FLEXIBLE FIRE RESISTANT INSULATION COATING FOR ELECTRICAL CONDUITS, WIRES AND CABLES
WO1996002920A1 (en) * 1994-07-14 1996-02-01 Raychem Limited Fire-resistant wires
DE10051962A1 (en) * 2000-10-20 2002-05-02 Alcatel Sa Insulated electrical conductor with functional integrity in the event of a fire

Also Published As

Publication number Publication date
EP1619694A1 (en) 2006-01-25
PL1619694T3 (en) 2013-02-28

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