EP0809261A2 - Fire-resistant electrical cable, fire-resistant electrical conductor and process for manufacturing - Google Patents

Fire-resistant electrical cable, fire-resistant electrical conductor and process for manufacturing Download PDF

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Publication number
EP0809261A2
EP0809261A2 EP97401017A EP97401017A EP0809261A2 EP 0809261 A2 EP0809261 A2 EP 0809261A2 EP 97401017 A EP97401017 A EP 97401017A EP 97401017 A EP97401017 A EP 97401017A EP 0809261 A2 EP0809261 A2 EP 0809261A2
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EP
European Patent Office
Prior art keywords
flame
retardant material
fire
layer
electrical
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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
EP97401017A
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German (de)
French (fr)
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EP0809261B1 (en
EP0809261A3 (en
Inventor
Hans-Joachim Hübner
Gert Warden
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Nexans SA
Original Assignee
Alcatel SA
Alcatel Alsthom Compagnie Generale dElectricite
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0033Apparatus or processes specially adapted for manufacturing conductors or cables by electrostatic coating
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/17Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/29Protection against damage caused by extremes of temperature or by flame
    • H01B7/295Protection against damage caused by extremes of temperature or by flame using material resistant to flame

Definitions

  • the invention relates to a fire-proof electrical cable or a fire-proof electrical line with at least one wire having an electrical conductor and electrical insulation, at least one layer of a flame-retardant material and an outer jacket, and a method for producing such a fire-proof electrical cable or such a fire-proof electrical wire.
  • DE 39 19 502 A1 relates to a method for producing a fire-resistant electrical cable, in which the electrical conductor is wrapped in at least one layer with a mica-coated film or a corresponding tape made of a polymeric material. The wound conductor is then subjected to a temperature treatment and the polymer material is melted and optionally crosslinked. This results in electrical insulation which contains mica in a form parallel to the conductor surface.
  • a method for producing fire-proof insulation in which the continuous conductor is directly coated with a powdery mixture of a briefly non-melting component such as a low-melting glass and mineral substances such as mica or glass-ceramic mixtures and then a temperature treatment for the purpose of melting the binder and mechanical connection of the particles of the powdery mixture is subjected before the electrical plastic or rubber insulation is applied.
  • a briefly non-melting component such as a low-melting glass and mineral substances such as mica or glass-ceramic mixtures
  • the invention is based on the problem of specifying a fire-safe electrical cable or such an electrical line, which is simple and inexpensive to produce at a high production speed, and a corresponding production method.
  • the advantages that can be achieved by the invention are, in particular, that the flocking of an electrical conductor, a wire with electrical insulation or a stranding with multiple wires with the flame-retardant material enables high production speeds and the manufacture of the flame-retardant layer in one operation.
  • the application and drying of the adhesive can take place in a line with the extrusion of the electrical insulation and / or the outer jacket.
  • the cable according to the invention or the line according to the invention has good emergency running properties in the event of a fire, since the electrical insulation is maintained over a period of half an hour or more.
  • even surfaces with the smallest outside diameter can be reliably provided with a layer of flame-retardant material.
  • mica having good electrical insulation properties is used as the flame-retardant material even at high temperatures.
  • FIG. 1 shows a first embodiment
  • FIG. 2 shows a second
  • FIG. 3 shows a third embodiment of a fire-proof electrical cable according to the invention
  • FIG. 4 shows the production of a fire-proof electrical cable or such a cable according to the invention.
  • the fire-safe electrical line 1 shown by way of example in FIG. 1 has an electrical conductor 3 to which a layer 5 of flame-retardant material 7 is directly applied by flocking the circumference of the electrical conductor 3, which is provided with an adhesive, with the powdery flame-retardant material 7, for example with mica. Electrical insulation 9 and an outer jacket 11 are arranged above this.
  • the electrical insulation 9 directly surrounds the electrical conductor 3.
  • a layer 5 of flame-retardant material 7 is applied to the wire 13 consisting of the electrical conductor 3 and the electrical insulation 9.
  • This layer 5 is by flocking the periphery of the insulation 9 provided with an adhesive with a powdered flame retardant material 7 such as. B. mica.
  • An outer jacket 11 is arranged over the layer 5.
  • the fire-proof electrical line 1 shown by way of example in FIG. 3 has three wires 13 stranded with one another around a filler 12. Each of the cores 13 has an electrical conductor 3 and an electrical insulation 9 lying thereover. As shown in FIG. 1, a layer of flame-retardant material can be provided between the electrical conductor 3 and electrical insulation 9. The formed from the three wires 13 Soul 14 is enclosed by an inner jacket 15 filling the gusset. A layer 5 of flame-retardant material 7 is formed over the inner jacket 15, in that the flame-retardant material 7 is applied to the circumference of the inner jacket 15 provided with an adhesive by flocking. To the outside, the line 1 is closed by an outer jacket 11.
  • 4 shows an example of a device for producing fire-proof electrical cables or lines.
  • 4 shows the application of a layer 5 of flame-retardant material 7 to an electrical conductor 3 as an example.
  • this method can also be used in the same way for the application of such a flame-retardant layer to a wire, to a twisted strand or any other strand.
  • a thin layer of an adhesive 23 is first applied to the electrical conductor 3 on all sides when it passes through the device, for example by means of an annular nozzle 21. As an adhesive 23 z. B.
  • a hot melt adhesive which is held in a container 25 by means of a heating device 27 in the molten state and is fed to the ring nozzle 21 by means of a suitable conveying device.
  • the electrical conductor 3 coated with the molten adhesive 23 passes through a flocking chamber 29.
  • the powdery flame-retardant material 7 is set in turbulence. If necessary under the influence of an electrostatic field, the electrical conductor 3 provided with the molten adhesive 23 is evenly flocked with the flame-retardant material 7 as it passes through the flocking chamber 29.
  • the flocking is not in one such flocking chamber 29, but with the help of a special flocking nozzle under the action of an electrostatic field.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)

Abstract

The cable or wire has at least one wire contg. an electrical conductor and electrical insulation, at least one layer of a flame-restricting material and an outer covering. The flame-restricting material (7) is electrostatically applied to a surface with an adhesive coating (23). The layer(5) of flame-restrictive material (7) can be mica and can be directly applied to the electrical conductor (3), to the wire or to a cable contg. 3 or more conductors.

Description

Die Erfindung betrifft ein brandsicheres elektrisches Kabel oder eine brandsichere elektrische Leitung mit zumindest einer einen elektrischen Leiter und eine elektrische Isolierung aufweisenden Ader, wenigstens einer Schicht eines flammhemmenden Materials und einem Außenmantel, bzw. ein Verfahren zur Herstellung eines solchen brandsicheren elektrischen Kabels oder einer solchen brandsicheren elektrischen Leitung.The invention relates to a fire-proof electrical cable or a fire-proof electrical line with at least one wire having an electrical conductor and electrical insulation, at least one layer of a flame-retardant material and an outer jacket, and a method for producing such a fire-proof electrical cable or such a fire-proof electrical wire.

Aufgrund von spektakulären Brandfällen in Industrie- und Wohngebäuden, die zu erheblichen Sach- und
Personenschäden geführt haben, hat man die Notwendigkeit erkannt, daß elektrische Kabel und Leitungen im Brandfall so lange wie möglich funktionstüchtig bleiben müssen, damit es nicht zu einem frühen Ausfall der allgemeinen Stromversorgung oder der Steuer- bzw. Fernmeldesysteme kommt. In derartigen Notfällen kommt es gerade darauf an, daß bestimmte Anlagen oder Einrichtungen auf jeden Fall weiter betrieben und Signale und Informationen zu Steuerzwecken auch im Brandfall noch übermittelt werden können.
Due to spectacular fires in industrial and residential buildings that lead to substantial property and
Personal injury has resulted in the need to recognize that electrical cables and wires must remain functional as long as possible in the event of a fire, so that there is no early failure of the general power supply or the control or telecommunications systems. In such emergencies, it is particularly important that certain systems or facilities continue to be operated and signals and information for control purposes can still be transmitted even in the event of a fire.

Es sind bereits verschiedene elektrische Kabel und Leitungen vorgeschlagen worden, die zum Isolationserhalt im Brandfall mit besonderen Schichten ausgestattet sind. Diese Schichten sollen bei den im Brandfall auftretenden hohen Temperaturen noch über eine gewisse Zeit die Funktionsfähigkeit des Kabels bzw. der Leitung gewährleisten. So ist in der DE 28 00 688 C2 ein feuerbeständiges elektrisches Kabel beschrieben, bei dem jeder elektrische Leiter von einem Glimmerband und darüber von einer wärmebeständigen Gummiisolierung umgeben ist. Glimmerbänder weisen ein Trägerband auf, das auf zumindest einer Seite mit Glimmermaterial versehen ist. Glimmer hat auch bei den im Brandfall auftretenden hohen Temperaturen ausgezeichnete elektrische Isolationseigenschaften. Die Verwendung von Glimmerbändern zur Herstellung von feuerfesten Schichten hat allerdings den Nachteil, daß ihre Aufbringung die Fertigungsgeschwindkeit des Kabels bzw. der Leitung begrenzt und vergleichsweise aufwendig ist. Darüber hinaus sind Glimmerbänder nur zur Umwicklung von einen vergleichsweise großen Außendurchmesser aufweisenden elektrischen Leitern, Adern und dergleichen geeignet.Various electrical cables and lines have already been proposed which are equipped with special layers in order to maintain insulation in the event of a fire. At the high temperatures that occur in the event of a fire, these layers are intended to maintain the functionality of the cable or line for a certain time guarantee. For example, DE 28 00 688 C2 describes a fire-resistant electrical cable in which each electrical conductor is surrounded by a mica tape and above that by heat-resistant rubber insulation. Mica tapes have a carrier tape which is provided with mica material on at least one side. Mica also has excellent electrical insulation properties in the event of high temperatures in the event of a fire. However, the use of mica tapes for the production of refractory layers has the disadvantage that their application limits the manufacturing speed of the cable or the line and is comparatively complex. In addition, mica tapes are only suitable for wrapping electrical conductors, wires and the like which have a comparatively large outside diameter.

Die DE 39 19 502 A1 betrifft ein Verfahren zur Herstellung eines feuerbeständigen elektrischen Kabels, bei dem der elektrische Leiter mit einer glimmerbeschichteten Folie oder einem entsprechenden Band aus einem polymeren Werkstoff in mindestens einer Lage umwickelt wird. Anschließend wird der umwickelte Leiter einer Temperaturbehandlung unterworfen und dabei der polymere Werkstoff aufgeschmolzen und gegebenenfalls vernetzt. Auf diese Weise ergibt sich eine elektrische Isolierung, die Glimmer in zur Leiteroberfläche parallel ausgerichteter Form enthält.DE 39 19 502 A1 relates to a method for producing a fire-resistant electrical cable, in which the electrical conductor is wrapped in at least one layer with a mica-coated film or a corresponding tape made of a polymeric material. The wound conductor is then subjected to a temperature treatment and the polymer material is melted and optionally crosslinked. This results in electrical insulation which contains mica in a form parallel to the conductor surface.

Aus der DE 30 07 341 A1 ist ein Verfahren zur Herstellung einer brandsicheren Isolierung bekannt, bei dem der durchlaufende Leiter unmittelbar mit einem pulverförmigen Gemisch aus einer kurzzeitig nichtschmelzenden Komponente wie einem niedrigschmelzenden Glas und mineralischen Stoffen wie Glimmer oder Glas-Keramik-Gemischen beschichtet und anschließend einer Temperaturbehandlung zum Zwecke des Aufschmelzens des Bindemittels und der mechanischen Verbindung der Teilchen des pulverförmigen Gemisches unterworfen wird, bevor die elektrische Kunststoff- oder Gummiisolierung aufgebracht wird.From DE 30 07 341 A1 a method for producing fire-proof insulation is known, in which the continuous conductor is directly coated with a powdery mixture of a briefly non-melting component such as a low-melting glass and mineral substances such as mica or glass-ceramic mixtures and then a temperature treatment for the purpose of melting the binder and mechanical connection of the particles of the powdery mixture is subjected before the electrical plastic or rubber insulation is applied.

Ausgehend von diesem Stand der Technik liegt der Erfindung das Problem zugrunde, ein einfach und mit hoher Fertigungsgeschwindigkeit kostengünstig herstellbares brandsicheres elektrisches Kabel bzw. eine solche elektrische Leitung sowie ein entsprechendes Herstellungsverfahren anzugeben.On the basis of this prior art, the invention is based on the problem of specifying a fire-safe electrical cable or such an electrical line, which is simple and inexpensive to produce at a high production speed, and a corresponding production method.

Dieses Problem wird durch die Merkmale des Anspruches 1 bzw. des Anspruches 6 gelöst, indem auf eine mit der Schicht flammhemmenden Materials zu versehene Oberfläche ein Klebemittel aufgebracht und im gleichen Arbeitsgang die Oberfläche mit dem flammhemmenden Material beflockt wird.This problem is solved by the features of claim 1 and claim 6 by applying an adhesive to a surface to be provided with the layer of flame-retardant material and flocking the surface with the flame-retardant material in the same operation.

Die durch die Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß die Beflockung eines elektrischen Leiters, einer eine elektrische Isolierung aufweisenden Ader oder eines mehrere Adern aufweisenden Verseilverbandes mit dem flammhemmenden Material hohe Fertigungsgeschwindigkeiten und die Fertigung der flammhemmenden Schicht in einem Arbeitsgang ermöglicht. So kann die Aufbringung und die Trocknung des Klebemittels in einer Linie mit dem Extrudieren der elektrischen Isolierung und/oder des Außenmantels erfolgen. Das erfindungsgemäße Kabel bzw. die erfindungsgemäße Leitung weist im Brandfall gute Notlaufeigenschaften auf, da die elektrische Isolation über einen Zeitraum von einer halben Stunde und mehr erhalten bleibt. Darüber hinaus können auch Oberflächen mit kleinstem Außendurchmesser zuverlässig mit einer Schicht flammhemmenden Materials versehen werden. Dabei ist für eine dichte Beflockung mit pulverförmigem, flammhemmendem Material bereits eine vergleichsweise kleine auf die Oberfläche aufgebrachte Menge an Klebemittel ausreichend, so daß die so hergestellte flammhemmende Schicht im Vergleich zu einer aus Glimmerbändern hergestellten flammhemmenden Schicht einen wesentlich geringeren Anteil nicht-flammhemmenden Materials aufweist.The advantages that can be achieved by the invention are, in particular, that the flocking of an electrical conductor, a wire with electrical insulation or a stranding with multiple wires with the flame-retardant material enables high production speeds and the manufacture of the flame-retardant layer in one operation. Thus, the application and drying of the adhesive can take place in a line with the extrusion of the electrical insulation and / or the outer jacket. The cable according to the invention or the line according to the invention has good emergency running properties in the event of a fire, since the electrical insulation is maintained over a period of half an hour or more. In addition, even surfaces with the smallest outside diameter can be reliably provided with a layer of flame-retardant material. For dense flocking with powdered, flame-retardant material, this is already a comparative one small amount of adhesive applied to the surface is sufficient so that the flame-retardant layer thus produced has a significantly lower proportion of non-flame-retardant material compared to a flame-retardant layer made from mica tapes.

Durch die in den Unteransprüchen aufgeführten Merkmale sind vorteilhafte Weiterbildungen und Verbesserungen der Erfindung möglich.Advantageous developments and improvements of the invention are possible due to the features listed in the subclaims.

Für einen möglichst langen Erhalt der Isolation des elektrischen Kabels bzw. der elektrischen Leitung im Brandfall ist es vorteilhaft, wenn als flammhemmendes Material auch bei hohen Temperaturen gute elektrische Isolationseigenschaften aufweisendes Glimmer verwendet ist.In order to maintain the insulation of the electrical cable or the electrical line in the event of a fire for as long as possible, it is advantageous if mica having good electrical insulation properties is used as the flame-retardant material even at high temperatures.

Um das flammhemmende Material möglichst gleichmäßig auf die mit dem Klebemittel versehene Oberfläche aufzubringen, ist es vorteilhaft, wenn das flammhemmende Material unter Einwirkung eines elektrostatischen Feldes aufgebracht wird.In order to apply the flame-retardant material as evenly as possible to the surface provided with the adhesive, it is advantageous if the flame-retardant material is applied under the action of an electrostatic field.

Drei Ausführungsbeispiele von brandsicheren elektrischen Leitungen sowie eine Anordnung zur Durchführung des erfindungsgemäßen Herstellungsverfahrens sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen die Fig. 1 ein erstes, die Fig. 2 ein zweites und die Fig. 3 ein drittes Ausführungsbeispiel einer erfindungsgemäßen brandsicheren elektrischen Leitung sowie die Fig. 4 die erfindungsgemäße Herstellung eines brandsicheren elektrischen Kabels bzw. einer solchen Leitung.Three exemplary embodiments of fire-proof electrical lines and an arrangement for carrying out the manufacturing method according to the invention are shown in simplified form in the drawing and explained in more detail in the following description. 1 shows a first embodiment, FIG. 2 shows a second and FIG. 3 shows a third embodiment of a fire-proof electrical cable according to the invention, and FIG. 4 shows the production of a fire-proof electrical cable or such a cable according to the invention.

Die in der Fig. 1 beispielhaft dargestellte brandsichere elektrische Leitung 1 weist einen elektrischen Leiter 3 auf, auf den unmittelbar eine Schicht 5 flammhemmenden Materials 7 durch Beflocken des mit einem Klebemittel versehenen Umfanges des elektrischen Leiters 3 mit dem pulverförmigen flammhemmenden Material 7, beispielsweise mit Glimmer, aufgebracht ist. Darüber sind eine elektrische Isolierung 9 und ein Außenmantel 11 angeordnet.The fire-safe electrical line 1 shown by way of example in FIG. 1 has an electrical conductor 3 to which a layer 5 of flame-retardant material 7 is directly applied by flocking the circumference of the electrical conductor 3, which is provided with an adhesive, with the powdery flame-retardant material 7, for example with mica. Electrical insulation 9 and an outer jacket 11 are arranged above this.

Bei der in der Fig. 2 dargestellten brandsicheren elektrischen Leitung 1 umschließt die elektrische Isolierung 9 den elektrischen Leiter 3 unmittelbar. Auf die aus dem elektrischen Leiter 3 und der elektrischen Isolierung 9 bestehende Ader 13 ist eine Schicht 5 flammhemmenden Materials 7 aufgebracht. Diese Schicht 5 ist durch das Beflocken des mit einem Klebemittel versehenen Umfangs der Isolierung 9 mit einem pulverförmigen flammhemmenden Material 7 wie z. B. Glimmer ausgebildet. Über der Schicht 5 ist ein Außenmantel 11 angeordnet.In the fire-proof electrical line 1 shown in FIG. 2, the electrical insulation 9 directly surrounds the electrical conductor 3. A layer 5 of flame-retardant material 7 is applied to the wire 13 consisting of the electrical conductor 3 and the electrical insulation 9. This layer 5 is by flocking the periphery of the insulation 9 provided with an adhesive with a powdered flame retardant material 7 such as. B. mica. An outer jacket 11 is arranged over the layer 5.

Es ist ebenfalls möglich, in Kombination der in den Fig. 1 und 2 dargestellten Ausführungsbeispiele sowohl unmittelbar über dem elektrischen Leiter 3 als auch zwischen dem Umfang der Ader 13 und dem Außenmantel 11 jeweils eine Schicht flammhemmenden Materials vorzusehen. In diesem Fall ist es besonders vorteilhaft, wenn die elektrische Isolierung 9 aus einem wärmebeständigen Werkstoff ausgebildet ist.It is also possible, in combination with the exemplary embodiments shown in FIGS. 1 and 2, to provide a layer of flame-retardant material both directly above the electrical conductor 3 and between the circumference of the wire 13 and the outer jacket 11. In this case, it is particularly advantageous if the electrical insulation 9 is made of a heat-resistant material.

Die in der Fig. 3 beispielhaft dargestellte brandsichere elektrische Leitung 1 weist drei miteinander um einen Beilauf 12 verseilte Adern 13 auf. Jede der Adern 13 hat einen elektrischen Leiter 3 und eine darüber liegende elektrische Isolierung 9. Zwischen elektrischem Leiter 3 und elektrischer Isolierung 9 kann, wie in der Fig. 1 dargestellt ist, eine Schicht flammhemmenden Materials vorgesehen sein. Die aus den drei Adern 13 gebildete Seele 14 ist von einem die Zwickel füllenden Innenmantel 15 umschlossen. Über dem Innenmantel 15 ist eine Schicht 5 flammhemmenden Materials 7 ausgebildet, indem das flammhemmende Material 7 auf den mit einem Klebemittel versehenen Umfang des Innenmantels 15 durch Beflocken aufgebracht ist. Nach außen hin wird die Leitung 1 durch einen Außenmantel 11 abgeschlossen.The fire-proof electrical line 1 shown by way of example in FIG. 3 has three wires 13 stranded with one another around a filler 12. Each of the cores 13 has an electrical conductor 3 and an electrical insulation 9 lying thereover. As shown in FIG. 1, a layer of flame-retardant material can be provided between the electrical conductor 3 and electrical insulation 9. The formed from the three wires 13 Soul 14 is enclosed by an inner jacket 15 filling the gusset. A layer 5 of flame-retardant material 7 is formed over the inner jacket 15, in that the flame-retardant material 7 is applied to the circumference of the inner jacket 15 provided with an adhesive by flocking. To the outside, the line 1 is closed by an outer jacket 11.

Die Fig. 4 zeigt beispielhaft eine Vorrichtung zur Herstellung von brandsicheren elektrischen Kabeln oder Leitungen. Dabei ist in der Fig. 4 als Beispiel das Aufbringen einer Schicht 5 aus flammhemmendem Material 7 auf einen elektrischen Leiter 3 dargestellt. Dieses Verfahren ist aber in gleicher Art auch für das Aufbringen einer solchen flammhemmenden Schicht auf eine Ader, auf einen Verseilverband oder einen anderen beliebigen Strang anwendbar. Zur Herstellung der einen elektrischen Leiter 3 umschließenden Schicht 5 flammhemmenden Materials 7 wird zunächst beim Durchlauf durch die Vorrichtung beispielsweise mittels einer Ringdüse 21 eine dünne Schicht eines Klebemittels 23 allseitig auf den elektrischen Leiter 3 aufgebracht. Als Klebemittel 23 wird z. B. ein Schmelzkleber verwendet, der in einem Behälter 25 mittels einer Heizvorrichtung 27 im schmelzflüssigen Zustand gehalten und mittels einer geeigneten Fördereinrichtung der Ringdüse 21 zugeführt wird. Im Anschluß an die Ringdüse 21 durchläuft der mit dem schmelzflüssigen Klebemittel 23 beschichtete elektrische Leiter 3 eine Beflockungskammer 29. In der Beflockungskammer 29 wird das pulverförmige flammhemmende Material 7 in Turbulenz versetzt. Gegebenenfalls unter Einwirkung eines elektrostatischen Feldes wird der mit dem schmelzflüssigen Klebemittel 23 versehene elektrische Leiter 3 beim Durchlauf durch die Beflockungskammer 29 mit dem flammhemmenden Material 7 gleichmäßig beflockt.4 shows an example of a device for producing fire-proof electrical cables or lines. 4 shows the application of a layer 5 of flame-retardant material 7 to an electrical conductor 3 as an example. However, this method can also be used in the same way for the application of such a flame-retardant layer to a wire, to a twisted strand or any other strand. To produce the layer 5 of flame-retardant material 7 enclosing an electrical conductor 3, a thin layer of an adhesive 23 is first applied to the electrical conductor 3 on all sides when it passes through the device, for example by means of an annular nozzle 21. As an adhesive 23 z. B. uses a hot melt adhesive, which is held in a container 25 by means of a heating device 27 in the molten state and is fed to the ring nozzle 21 by means of a suitable conveying device. Following the ring nozzle 21, the electrical conductor 3 coated with the molten adhesive 23 passes through a flocking chamber 29. In the flocking chamber 29, the powdery flame-retardant material 7 is set in turbulence. If necessary under the influence of an electrostatic field, the electrical conductor 3 provided with the molten adhesive 23 is evenly flocked with the flame-retardant material 7 as it passes through the flocking chamber 29.

Es ist ebenfalls möglich, die Beflockung nicht in einer solchen Beflockungskammer 29, sondern mit Hilfe einer speziellen Beflockungsdüse unter Einwirkung eines elektrostatischen Feldes durchzuführen.It is also possible that the flocking is not in one such flocking chamber 29, but with the help of a special flocking nozzle under the action of an electrostatic field.

Claims (11)

Brandsicheres elektrisches Kabel oder brandsichere elektrische Leitung mit zumindest einer einen elektrischen Leiter und eine elektrische Isolierung aufweisenden Ader, wenigstens einer Schicht eines flammhemmenden Materials und einem Außenmantel, dadurch gekennzeichnet, daß das flammhemmende Material (7) auf eine mit einem Klebemittel (23) versehene Oberfläche durch Beflocken aufgebracht ist.Fire-proof electrical cable or fire-proof electrical line with at least one wire having an electrical conductor and electrical insulation, at least one layer of a flame-retardant material and an outer jacket, characterized in that the flame-retardant material (7) is applied to a surface provided with an adhesive (23) is applied by flocking. Kabel oder Leitung nach Anspruch 1, dadurch gekennzeichnet, daß als flammhemmendes Material (7) Glimmer verwendet ist.Cable or line according to Claim 1, characterized in that mica is used as the flame-retardant material (7). Kabel oder Leitung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Schicht (5) flammhemmenden Materials (7) unmittelbar auf den elektrischen Leiter (3) aufgebracht ist.Cable or line according to Claim 1 or 2, characterized in that the layer (5) of flame-retardant material (7) is applied directly to the electrical conductor (3). Kabel oder Leitung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Schicht (5) flammhemmenden Materials (7) auf die Ader (13) aufgebracht ist.Cable or line according to one of Claims 1 to 3, characterized in that the layer (5) of flame-retardant material (7) is applied to the wire (13). Kabel oder Leitung nach einem der Ansprüche 1 bis 3 mit einer aus einer Mehrzahl von miteinander verseilten Adern gebildeten Seele, dadurch gekennzeichnet, daß die Schicht (5) flammhemmenden Materials (7) über der Seele (14) aufgebracht ist.Cable or line according to one of Claims 1 to 3 with a core formed from a plurality of cores stranded together, characterized in that the layer (5) is flame-retardant Material (7) is applied over the soul (14). Verfahren zur Herstellung eines brandsicheren elektrischen Kabels oder einer brandsicheren elektrischen Leitung mit zumindest einer einen elektrischen Leiter und eine elektrische Isolierung aufweisenden Ader, wenigstens einer Schicht eines flammhemmenden Materials und einem Außenmantel, dadurch gekennzeichnet, daß auf eine mit der Schicht (5) flammhemmenden Materials (7) zu versehene Oberfläche ein Klebemittel (23) aufgebracht und im gleichen Arbeitsgang die Oberfläche mit dem flammhemmenden Material (7) beflockt wird.Method for producing a fire-proof electrical cable or a fire-proof electrical line with at least one wire having an electrical conductor and electrical insulation, at least one layer of a flame-retardant material and an outer jacket, characterized in that a flame-retardant material with the layer (5) 7) surface to be provided with an adhesive (23) and in the same operation the surface is flocked with the flame-retardant material (7). Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß das flammhemmende Material (7) unter Einwirkung eines elektrostatischen Feldes aufgebracht wird.Method according to claim 6, characterized in that the flame-retardant material (7) is applied under the action of an electrostatic field. Verfahren nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß als flammhemmendes Material (7) Glimmer verwendet wird.Method according to Claim 6 or 7, characterized in that mica is used as the flame-retardant material (7). Verfahren nach einem der Ansprüche 6 bis 8, dadurch gekennzeichnet, daß die Schicht (5) flammhemmenden Materials (7) unmittelbar auf den elektrischen Leiter (3) aufgebracht wird.Method according to one of claims 6 to 8, characterized in that the layer (5) of flame-retardant material (7) is applied directly to the electrical conductor (3). Verfahren nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß die Schicht (5) flammhemmenden Materials (7) auf die Ader (13) aufgebracht wird.Method according to one of claims 6 to 9, characterized in that the layer (5) of flame-retardant material (7) is applied to the wire (13). Verfahren nach einem der Ansprüche 6 bis 9, wobei das Kabel oder die Leitung eine aus einer Mehrzahl von miteinander verseilten Adern gebildete Seele hat, dadurch gekennzeichnet, daß die Schicht (5) flammhemmenden Materials (7) über der Seele (14) aufgebracht wird.Method according to one of claims 6 to 9, wherein the cable or the line has a core formed from a plurality of cores stranded together, characterized in that the layer (5) of flame-retardant material (7) is applied over the core (14).
EP97401017A 1996-05-24 1997-05-02 Fire-resistant electrical cable, fire-resistant electrical conductor and process for manufacturing Expired - Lifetime EP0809261B1 (en)

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DE19620963A DE19620963A1 (en) 1996-05-24 1996-05-24 Fire-proof electrical cable or fire-proof electrical wire and method of manufacture
DE19620963 1996-05-24

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EP0809261A3 EP0809261A3 (en) 1998-06-03
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EP0809261B1 (en) 2002-04-10
DE19620963A1 (en) 1997-11-27
EP0809261A3 (en) 1998-06-03
DE59706935D1 (en) 2002-05-16

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