EP1037217B1 - Continuous manufacturing method and device for coated cables and device for carrying out this method - Google Patents

Continuous manufacturing method and device for coated cables and device for carrying out this method Download PDF

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Publication number
EP1037217B1
EP1037217B1 EP00890074A EP00890074A EP1037217B1 EP 1037217 B1 EP1037217 B1 EP 1037217B1 EP 00890074 A EP00890074 A EP 00890074A EP 00890074 A EP00890074 A EP 00890074A EP 1037217 B1 EP1037217 B1 EP 1037217B1
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EP
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Prior art keywords
polymer
inner conductor
sizing means
diameter
cooled
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German (de)
French (fr)
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EP1037217A3 (en
EP1037217A2 (en
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Kurt Ing. Kerschbaum
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SCHUBERT, FRIEDRICH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H01B13/145—Pretreatment or after-treatment

Definitions

  • the present invention relates to a process for continuous Production of jacketed cables, in particular for coaxial cables with an inner conductor and an outer conductor, with a foamed polymer as a dielectric between them is, in which method with chemical and / or physical blowing agents offset by means of polymer a tool, in particular by means of an extruder, is applied to the inner conductor and then cooled.
  • the invention further relates to a device for implementation this method with an extruder, the ring nozzle to the exit of the polymer and an opening in the center having the annular nozzle for the inner conductor, as well as with a Cooler.
  • the conventional method for applying a foam insulation for coax cable is made by extrusion directly on the Ladder and free foaming with chemical and / or physical blowing agents offset polymer to the outside (see for example EP 336 804 A2, EP 89 060 B1).
  • a smooth Surface is however a prerequisite for a good longitudinal water seal between outer conductor and the insulation. acceptable, but not necessarily optimal surfaces will be up to date by lengthy experiments on tool design, recipe and - especially for larger diameters (from about 25 mm) - achieved at an often fixed production speed. In In many cases, the production speed is lower than those that would be possible on the extrusion line.
  • Some cable manufacturers solve the problem of rough surface by means of a downstream of the cooling section, heated Calibration nozzle for smoothing the surface through Melting of the outermost foam layer.
  • a smooth, closed Surface is not accessible or at least only with loss of the achieved degree of foam, as the Isolation by means of calibration under pressure, i. by Pressing, is smoothed.
  • Complicating with coax cables are the high demands Dimensional accuracy such as diameter, roundness and centricity, which especially with larger dimensions not easy to realize are.
  • the present invention which is based on the above the presented method is now the task Basically, to facilitate the manufacture of these products and at the same time to significantly improve the quality: the polymer should be given a calibrated surface at simultaneous training of an outer skin and simultaneous Increase in the foam level.
  • This object is achieved according to the invention in a method of the type mentioned solved in that the still liquid polymer immediately after the tool emerges on the outer layer cooled and calibrated using a refrigerated calibration is, so the outside one compared to the remaining foamed polymer denser unfoamed polymer skin layer is formed.
  • the device according to the invention is characterized that the cooling device is a refrigerated calibration, which is provided after the annular nozzle.
  • the calbration Due to the calbration are a smooth surface, more constant Diameter, exact roundness and centricity guaranteed.
  • the high dimensional stability also improves decisively the electrical values such as damping and capacity.
  • the insulation can be used in very narrow diameter, ovality and Capacity tolerances are extruded.
  • the thickness of the Skin is dependent and thus adjustable on the one hand on the Cooling temperature in the calibration and on the other hand the time of cooling in the calibration.
  • the cooling time can be determined by the ratio of nozzle diameter to calibration diameter be determined.
  • the polymer is in the immediate vicinity of the cooled Calibration is applied and foaming in the direction takes place to the inner conductor; or that the polymer is in the middle applied between the cooled calibration and the inner conductor is and the foaming both towards the inner conductor as well as towards calibration done; or that the polymer is applied in the immediate vicinity of the inner conductor is and the foaming towards the calibration he follows.
  • the diameter of the annular nozzle about the diameter the calibration; or the diameter of the annular nozzle is located between the diameter of the calibration and the diameter the inner conductor; or the diameter of the annular nozzle corresponds about the diameter of the inner conductor.
  • the calibration Vacuum constructed, e.g. by a connected to the spray head Vacuum device.
  • a gap for thermal insulation is provided, which is sufficiently small to one Prevent leakage of the polymer. It was in the frame surprisingly found in the present invention that it is possible to provide a gap, the small enough to prevent leakage of the polymer, but big enough is the refrigerated calibration thermally isolate from the hot annular nozzle.
  • the thickness of the Gap is a few tenths of a millimeter.
  • the calibration can be done directly on the crosshead with the required Gap can be fixed, it can cool in one the polymer may be installed downstream of the cooling chamber, and it may also be part of the extrusion head, i.e. be integrated in the extrusion head.
  • FIGs. 1-3 show various embodiments the device according to the invention.
  • An annular die 2 of an extruder becomes molten polymer 4 supplied under pressure.
  • an inner conductor 6 is passed through the annular nozzle 2.
  • a Calbir ist 1 which is cooled by means of a coolant 9 is.
  • the entire calibration is in a cooling chamber 11, of which only the front wall can be seen in the figures.
  • the cooling chamber can be evacuated.
  • the leaking liquid Polymer 4 foams as a result of pressure relief, forming the foamed polymer 5.
  • the diameter D of the calibration 1 corresponds to the diameter d of the annular nozzle 2.
  • the liquid Polymer 4 is therefore immediately in contact with the calibration 1 and foams toward the inner conductor 6. By the instant cooling will cause foaming directly during calibration 1 prevents an outer skin 7 from forming, which is much denser than the rest of the foamed polymer 5. It forms a calibrated, very smooth surface out.
  • the diameter d of the annular nozzle 2 is between the diameter D of the calibration 1 and the diameter of the inner conductor 6.
  • the foaming therefore takes place both in Direction to the inner conductor 6 and towards the calibration 1.
  • the cooling takes place later, the skin 7 is therefore thinner.
  • the diameter d of the annular nozzle 2 corresponds the diameter of the inner conductor 6.
  • the foaming takes place only towards calibration 1. Cooling is still in progress Later, Skin 7 is even thinner.
  • This method can be applied to all types of internal conductors Be: solid, stranded, smooth or wavy pipe; Copper, aluminum, steel, etc. Of course it can too be applied to such inner conductor, in front of the foam insulation with a tandem or co-extrusion process applied innerskin for better adhesion of the foam are provided.
  • the procedure can be used with all diameters the foam insulation (of the dielectric) apply. It is also suitable for two- and multi-layer extrusion (also at Extrusion of an outer skin).

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Manufacturing Of Electric Cables (AREA)

Abstract

A process for the continuous production of mantled cables, especially coaxial cables with inner and outer conductors and an intermediate dielectric, comprises applying a polymer to the inner conductor using an extruder, and then cooling it. The polymer is cooled after the tool is removed and then calibrated, so an outer skin is formed which is denser than the rest of the polymer.

Description

Die vorliegende Erfindung betrifft ein Verfahren zur kontinuierlichen Herstellung von ummantelten Kabeln, insbesondere für Koaxialkabel mit einem Innenleiter und einem Außenleiter, wobei dazwischen ein geschäumtes Polymer als Dielektrikum angeordnet ist, bei welchem Verfahren das mit chemischen und/oder physikalischen Treibmitteln versetzte Polymer mittels eines Werkzeugs, insbesondere mittels eines Extruders, auf den Innenleiter aufgebracht und danach abgekühlt wird.The present invention relates to a process for continuous Production of jacketed cables, in particular for coaxial cables with an inner conductor and an outer conductor, with a foamed polymer as a dielectric between them is, in which method with chemical and / or physical blowing agents offset by means of polymer a tool, in particular by means of an extruder, is applied to the inner conductor and then cooled.

Die Erfindung betrifft weiters eine Vorrichtung zur Durchführung dieses Verfahrens mit einem Extruder, der eine Ringdüse zum Austritt des Polymers und eine Öffnung im Zentrum der Ringdüse für den Innenleiter aufweist, sowie mit einer Kühlvorrichtung.The invention further relates to a device for implementation this method with an extruder, the ring nozzle to the exit of the polymer and an opening in the center having the annular nozzle for the inner conductor, as well as with a Cooler.

Das herkömmliche Verfahren zur Aufbringung einer Schaumisolation für Koax-Kabel erfolgt durch Extrusion direkt auf den Leiter und ein freies Aufschäumen des mit chemischen und/oder physikalischen Treibmitteln versetzten Polymers nach außen (siehe z.B. EP 336 804 A2, EP 89 060 B1). Je größer aber der Durchmesser und je höher der Schaumgrad ist, desto schwieriger ist es, eine glatte Oberfläche zu erzielen. Eine glatte Oberfläche ist aber Voraussetzung für eine gute Längswasserdichtung zwischen Außenleiter und der Isolation. Akzeptable, aber nicht unbedingt optimale Oberflächen werden bis dato mittels langwieriger Versuche über Werkzeugauslegung, Rezeptur und - speziell bei größeren Durchmessern (etwa ab 25 mm) - bei einer oft fixen Produktionsgeschwindigkeit erzielt. In vielen Fällen ist dann die Produktionsgeschwindigkeit niedriger als jene, die auf der Extrusionsanlage möglich wäre. Einige Kabelhersteller lösen das Problem der rauen Oberfläche mittels einer am Ende der Kühlstrecke nachgeschalteten, beheizbaren Kalibrierdüse zur Glättung der Oberfläche durch Anschmelzen der äußersten Schaumschicht. Eine glatte, geschlossene Oberfläche ist aber nicht erreichbar oder jedenfalls nur unter Einbuße des erreichten Schaumgrades, da die Isolierung mittels der Kalibrierung unter Druck, d.h. durch Pressen, geglättet wird. The conventional method for applying a foam insulation for coax cable is made by extrusion directly on the Ladder and free foaming with chemical and / or physical blowing agents offset polymer to the outside (see for example EP 336 804 A2, EP 89 060 B1). The bigger but the Diameter and the higher the degree of foaming, the more difficult is to achieve a smooth surface. A smooth Surface is however a prerequisite for a good longitudinal water seal between outer conductor and the insulation. acceptable, but not necessarily optimal surfaces will be up to date by lengthy experiments on tool design, recipe and - especially for larger diameters (from about 25 mm) - achieved at an often fixed production speed. In In many cases, the production speed is lower than those that would be possible on the extrusion line. Some cable manufacturers solve the problem of rough surface by means of a downstream of the cooling section, heated Calibration nozzle for smoothing the surface through Melting of the outermost foam layer. A smooth, closed Surface is not accessible or at least only with loss of the achieved degree of foam, as the Isolation by means of calibration under pressure, i. by Pressing, is smoothed.

Weiters wird von manchen Kabelherstellern eine Außenskin aus solidem Polymer zur Erhöhung der mechanischen Festigkeit und/oder zur Erreichung einer glatten Oberfläche mittels eines zusätzlich erforderlichen Extruders im Co-Extrusionsverfahren aufgebracht (s. z.B. WO 98/01870 A, S 9 oben).Furthermore, some cable manufacturers become an outdoor kitten made of solid polymer to increase the mechanical strength and / or to achieve a smooth surface by means of a additionally required extruder in the co-extrusion process applied (see for example WO 98/01870 A, S 9 above).

Erschwerend bei Koax-Kabeln sind die hohen Anforderungen an Maßhaltigkeit wie Durchmesser, Rundheit und Zentrizität, welche vor allem bei größeren Abmessungen nicht einfach zu realisieren sind.Complicating with coax cables are the high demands Dimensional accuracy such as diameter, roundness and centricity, which especially with larger dimensions not easy to realize are.

Die zurzeit erreichbaren Schaumgrade bei noch guter Kabelqualität liegen bei 78%. Höhere Schaumgrade verbessern die Dämpfungswerte und somit auch die Übertragungseigenschaften des Kabels.The currently achievable foam grades with good cable quality are at 78%. Higher degrees of foam improve the Attenuation values and thus also the transmission properties of the cable.

Der vorliegenden Erfindung, welche sich auf das eingangs vorgestellte Verfahren bezieht, liegt nun die Aufgabe zu Grunde, die Herstellung dieser Produkte zu erleichtern und gleichzeitig auch die Qualität entscheidend zu verbessern: das Polymer soll eine kalibrierte Oberfläche erhalten bei gleichzeitiger Ausbildung einer Außenskin und gleichzeitiger Erhöhung des Schaumgrades.The present invention, which is based on the above the presented method is now the task Basically, to facilitate the manufacture of these products and at the same time to significantly improve the quality: the polymer should be given a calibrated surface at simultaneous training of an outer skin and simultaneous Increase in the foam level.

Diese Aufgabe wird gemäß der Erfindung bei einem Verfahren der eingangs genannten Art dadurch gelöst, dass das noch Flüssige Polymer unmittelbar nach dem Werkzeugaustritt an der Außenschicht mittels einer gekühlten Kalibrierung abgekühlt und kalibriert wird, sodass außen eine gegenüber dem restlichen geschäumten Polymer dichtere nicht aufgeschäumte Polymer-Skin-Schicht entsteht.This object is achieved according to the invention in a method of the type mentioned solved in that the still liquid polymer immediately after the tool emerges on the outer layer cooled and calibrated using a refrigerated calibration is, so the outside one compared to the remaining foamed polymer denser unfoamed polymer skin layer is formed.

Die erfindungsgemäße Vorrichtung ist dadurch gekennzeichnet, dass die Kühlvorrichtung eine gekühlte Kalibrierung ist, die im Anschluss an die Ringdüse vorgesehen ist.The device according to the invention is characterized that the cooling device is a refrigerated calibration, which is provided after the annular nozzle.

Durch die Kalbrierung sind eine glatte Oberfläche, konstanter Durchmesser, exakte Rundheit und Zentrizität gewährleistet. Mit der hohen Maßhaltigkeit verbessern sich auch entscheidend die elektrischen Werte wie Dämpfung und Kapazität. Die Isolation kann in sehr engen Durchmesser-, Ovalitäts- und Kapazitätstoleranzen extrudiert werden. Durch die schnelle Abkühlung der Randschicht der Isolation durch den sofortigen Wandkontakt an der Kalibrierung wird eine noch nicht aufgeschäumte und somit volle Polymerskin geformt. Die Dicke der Skin ist abhängig und somit einstellbar einerseits über die Kühltemperatur in der Kalibrierhülse und andererseits über den Zeitpunkt der Kühlung in der Kalibrierung. Der Kühlzeitpunkt kann durch das Verhältnis Düsendurchmesser zu Kalibrierdurchmesser festgelegt werden. Dementsprechend ist es möglich, dass das Polymer in unmittelbarer Nähe der gekühlten Kalibrierung aufgebracht wird und das Aufschäumen in Richtung zum Innenleiter erfolgt; oder dass das Polymer in der Mitte zwischen der gekühlten Kalibrierung und dem Innenleiter aufgebracht wird und das Aufschäumen sowohl in Richtung zum Innenleiter als auch in Richtung zur Kalibrierung erfolgt; oder dass das Polymer in unmittelbarer Nähe des Innenleiters aufgebracht wird und das Aufschäumen in Richtung zur Kalibrierung erfolgt. Bei der erfindungsgemäßen Vorrichtung entspricht daher der Durchmesser der Ringdüse etwa dem Durchmesser der Kalibrierung; oder der Durchmesser der Ringdüse liegt zwischen dem Durchmesser der Kalibrierung und dem Durchmesser des Innenleiters; oder der Durchmesser der Ringdüse entspricht etwa dem Durchmesser des Innenleiters.Due to the calbration are a smooth surface, more constant Diameter, exact roundness and centricity guaranteed. The high dimensional stability also improves decisively the electrical values such as damping and capacity. The insulation can be used in very narrow diameter, ovality and Capacity tolerances are extruded. By the fast Cooling of the boundary layer of insulation by the immediate Wall contact on the calibration will not foam yet and thus formed full polymerkin. The thickness of the Skin is dependent and thus adjustable on the one hand on the Cooling temperature in the calibration and on the other hand the time of cooling in the calibration. The cooling time can be determined by the ratio of nozzle diameter to calibration diameter be determined. Accordingly, it is possible that the polymer is in the immediate vicinity of the cooled Calibration is applied and foaming in the direction takes place to the inner conductor; or that the polymer is in the middle applied between the cooled calibration and the inner conductor is and the foaming both towards the inner conductor as well as towards calibration done; or that the polymer is applied in the immediate vicinity of the inner conductor is and the foaming towards the calibration he follows. In the apparatus according to the invention corresponds therefore, the diameter of the annular nozzle about the diameter the calibration; or the diameter of the annular nozzle is located between the diameter of the calibration and the diameter the inner conductor; or the diameter of the annular nozzle corresponds about the diameter of the inner conductor.

Bei einer gegebenen Vorrichtung ist es zweckmäßig, dass man die Dicke der Skin-Schicht durch Änderung der Temperatur des Kühlmediums der gekühlten Kalibrierung regelt.In a given device, it is appropriate that one the thickness of the skin layer by changing the temperature of the skin Cooling medium of the cooled calibration regulates.

Vorzugsweise wird in dem Hohlraum zwischen dem Innenleiter und dem aufzubringenden Polymer und/oder in dem Hohlraum zwischen dem aufzubringenden Polymer und der Kalibrierung ein Vakuum aufgebaut, z.B. durch ein am Spritzkopf angeschlossenes Vakuumgerät.Preferably, in the cavity between the inner conductor and the polymer to be applied and / or in the cavity between the polymer to be applied and the calibration Vacuum constructed, e.g. by a connected to the spray head Vacuum device.

Durch Anlegen von Vakuum in den Hohlräumen wird der Aufschäumprozess erleichtert, sodass ein höherer Schaumgrad erzielt werden kann. Je nach Auslegung des Düsen- und Kalbrierdurchmessers entstehen entweder ein Hohlraum zwischen Innenleiter und Polymer, ein weiterer zwischen Polymer und Kalibrierung oder nur einer zwischen Polymer und Kalibrierung, wo jeweils Vakuum angesetzt werden kann.By applying a vacuum in the cavities, the foaming process becomes facilitates, so that a higher degree of foam achieved can be. Depending on the design of the nozzle and Kalbrierdurchmessers arise either a cavity between inner conductor and polymer, another between polymer and calibration or only one between polymer and calibration where each vacuum can be applied.

Es ist zweckmäßig, wenn bei der Vorrichtung zwischen der Ringdüse und der Kalibrierung ein Spalt zur thermischen Isolierung vorgesehen ist, der ausreichend klein ist, um einen Austritt des Polymers zu verhindern. Es wurde nämlich im Rahmen der vorliegenden Erfindung überraschender Weise herausgefunden, dass es möglich ist, einen Spalt vorzusehen, der klein genug ist, um einen Austritt des Polymers zu verhindern, aber doch groß genug ist, um die gekühlte Kalibrierung von der heißen Ringdüse thermisch zu isolieren. Die Dicke des Spaltes liegt bei einigen Zehntel Millimeter.It is useful if in the device between the Ring nozzle and calibration a gap for thermal insulation is provided, which is sufficiently small to one Prevent leakage of the polymer. It was in the frame surprisingly found in the present invention that it is possible to provide a gap, the small enough to prevent leakage of the polymer, but big enough is the refrigerated calibration thermally isolate from the hot annular nozzle. The thickness of the Gap is a few tenths of a millimeter.

Die Kalibrierung kann direkt am Querspritzkopf mit dem erforderlichen Spalt fixiert sein, sie kann in einer zur Abkühlung des Polymers nachfolgenden Kühlkammer eingebaut sein, und sie kann auch ein Bestandteil des Extrusionskopfes sein, d.h. im Extrusionskopf integriert sein.The calibration can be done directly on the crosshead with the required Gap can be fixed, it can cool in one the polymer may be installed downstream of the cooling chamber, and it may also be part of the extrusion head, i.e. be integrated in the extrusion head.

Besonders günstig ist es, wenn die Kalibrierung in einer unmittelbar nachfolgenden, unter Vakuum stehenden Kühlkammer eingebaut ist. Dadurch wird der Aufschäumvorgang zur Wandung der Kalibrierung erleichtert und somit der Schaumgrad erhöht.It is particularly favorable if the calibration in one immediately following, under vacuum cooling chamber is installed. As a result, the foaming process to the wall facilitates the calibration and thus increases the degree of foam.

Anhand der beiliegenden Figuren wird die Erfindung näher erläutert. Die Fig. 1-3 zeigen verschiedene Ausführungsformen der erfindungsgemäßen Vorrichtung.With reference to the accompanying figures, the invention will be closer explained. Figs. 1-3 show various embodiments the device according to the invention.

Über eine Ringdüse 2 eines Extruders wird geschmolzenes Polymer 4 unter Druck zugeführt. Durch eine mittige Öffnung wird ein Innenleiter 6 durch die Ringdüse 2 geführt. Mit einem Abstand x vor der Öffnung der Ringdüse 2 befindet sich eine Kalbirierung 1, die mittels eines Kühlmittels 9 gekühlt ist. Die gesamte Kalibrierung befindet sich in einer Kühlkammer 11, von der in den Fig. nur die Vorderwand zu sehen ist. Die Kühlkammer kann evakuiert sein. Das austretende flüssige Polymer 4 schäumt infolge der Druckentlastung auf und bildet das geschäumte Polymer 5. Der Durchmesser D der Kalibrierung 1 entspricht dem Durchmesser d der Ringdüse 2. Das flüssige Polymer 4 kommt daher sofort mit der Kalibrierung 1 in Kontakt und schäumt in Richtung zum Innenleiter 6 auf. Durch die sofortige Abkühlung wird ein Aufschäumen direkt bei der Kalibrierung 1 verhindert, sodass sich eine Außen-Skin 7 bildet, die wesentlich dichter ist als der Rest des geschäumten Polymers 5. Es bildet sich eine kalibrierte, sehr glatte Oberfläche aus.An annular die 2 of an extruder becomes molten polymer 4 supplied under pressure. Through a central opening an inner conductor 6 is passed through the annular nozzle 2. With a Distance x in front of the opening of the annular nozzle 2 is located a Calbirierung 1, which is cooled by means of a coolant 9 is. The entire calibration is in a cooling chamber 11, of which only the front wall can be seen in the figures. The cooling chamber can be evacuated. The leaking liquid Polymer 4 foams as a result of pressure relief, forming the foamed polymer 5. The diameter D of the calibration 1 corresponds to the diameter d of the annular nozzle 2. The liquid Polymer 4 is therefore immediately in contact with the calibration 1 and foams toward the inner conductor 6. By the instant cooling will cause foaming directly during calibration 1 prevents an outer skin 7 from forming, which is much denser than the rest of the foamed polymer 5. It forms a calibrated, very smooth surface out.

In dem Hohlraum 10, der sich zwischen dem geschäumten Polymer 5 und dem Innenleiter 6 bildet, kann ein Vakuum angelegt werden, wodurch der Schäumungsgrad gesteigert wird.In the cavity 10, which is between the foamed polymer 5 and the inner conductor 6, a vacuum can be applied become, whereby the foaming degree is increased.

Gemäß Fig. 2 liegt der Durchmesser d der Ringdüse 2 zwischen dem Durchmesser D der Kalibrierung 1 und dem Durchmesser des Innenleiters 6. Die Schäumung erfolgt daher sowohl in Richtung zum Innenleiter 6 als auch in Richtung zur Kalibrierung 1. Die Abkühlung erfolgt später, die Skin 7 ist daher dünner.According to FIG. 2, the diameter d of the annular nozzle 2 is between the diameter D of the calibration 1 and the diameter of the inner conductor 6. The foaming therefore takes place both in Direction to the inner conductor 6 and towards the calibration 1. The cooling takes place later, the skin 7 is therefore thinner.

Es bildet sich zusätzlich zum Hohlraum 10 auch ein Hohlraum zwischen geschäumtem Polymer 5 und Kalibrierung 1 aus, der ebenfalls mit Vakuum beaufschlagt werden kann.It forms in addition to the cavity 10 and a cavity between foamed polymer 5 and calibration 1, the can also be applied with vacuum.

Gemäß Fig. 3 entspricht der Durchmesser d der Ringdüse 2 dem Durchmesser des Innenleiters 6. Die Schäumung erfolgt nur in Richtung zur Kalibrierung 1. Die Abkühlung erfolgt noch später, die Skin 7 ist noch dünner.According to FIG. 3, the diameter d of the annular nozzle 2 corresponds the diameter of the inner conductor 6. The foaming takes place only towards calibration 1. Cooling is still in progress Later, Skin 7 is even thinner.

Es bildet sich nur noch ein Hohlraum zwischen geschäumtem Polymer 5 und Kalibrierung 1 aus, der mit Vakuum beaufschlagt werden kann.It only forms a cavity between foamed Polymer 5 and calibration 1 off, which applies vacuum can be.

Dieses Verfahren kann auf alle Arten von Innenleitern angewendet werden: solid, verseilt, glattes oder gewelltes Rohr; Kupfer, Aluminium, Stahl usw. Selbstverständlich kann es auch auf solche Innenleiter angewendet werden, die vor der Schaumisolierung mit einer in Tandem- oder Co-Extrusionsverfahren aufgebrachten Innenskin zur besseren Haftung des Schaumes versehen sind. Das Verfahren lässt sich bei allen Durchmessern der Schaumisolation (des Dielektrikums) anwenden. Es eignet sich auch für Zwei- und Mehrschichtextrusion (auch bei Extrusion einer Außenskin).This method can be applied to all types of internal conductors Be: solid, stranded, smooth or wavy pipe; Copper, aluminum, steel, etc. Of course it can too be applied to such inner conductor, in front of the foam insulation with a tandem or co-extrusion process applied innerskin for better adhesion of the foam are provided. The procedure can be used with all diameters the foam insulation (of the dielectric) apply. It is also suitable for two- and multi-layer extrusion (also at Extrusion of an outer skin).

Es eignet sich auch für beliebige Profilquerschnitte, z.B. Zwillingsleiter, Nutenkabel oder sonstige Konstruktionen.It is also suitable for any profile cross sections, e.g. Twin ladder, grooved cable or other constructions.

Claims (15)

  1. Method for the continuous production of sheathed cables, in particular for coaxial cables having an inner conductor (6) and an outer conductor, a foamed polymer (5) being arranged in between as a dielectric, in which process the polymer (4) to which chemical and/or physical blowing agents have been added is applied to the inner conductor (6) by means of a tool, in particular by means of an extruder, and is then cooled, characterized in that the still liquid polymer (4) is cooled and sized by a cooled sizing means (1) immediately after emergence from the tool on the outer layer, so that an unfoamed polymer skin (7) which is denser than the remaining foamed polymer (5) forms on the outside.
  2. Method according to Claim 1, characterized in that the polymer is applied in the immediate vicinity of the cooled sizing means and the foaming is effected in the direction towards the inner conductor.
  3. Method according to Claim 1, characterized in that the polymer is applied in the middle between the cooled sizing means and the inner conductor and the foaming is effected both in the direction towards the inner conductor and in the direction towards the sizing means.
  4. Method according to Claim 1, characterized in that the polymer is applied in the immediate vicinity of the inner conductor and the foaming is effected in the direction towards the sizing means.
  5. Method according to any of Claims 1 to 4, characterized in that the thickness of the skin is regulated by changing the temperature of the cooling medium of the cooled sizing means.
  6. Method according to any of Claims 1 to 5, characterized in that a vacuum is established in the cavity between the inner conductor and the polymer to be applied and/or in the cavity between the polymer to be applied and the sizing means, for example by a vacuum device connected to the extrusion head.
  7. Device for carrying out the method according to Claim 1, comprising an extruder which has an annular die (2) for emergence of the liquid polymer (4) and an opening in the centre of the annular die (2) for the inner conductor (6), and comprising a cooling device, characterized in that the cooling device is a cooled sizing means (1) which is provided downstream of the annular die (2).
  8. Device according to Claim 7, characterized in that the diameter (d) of the annular die (2) corresponds approximately to the diameter (D) of the sizing means (1).
  9. Device according to Claim 7, characterized in that the diameter (d) of the annular die (2) is between the diameter (D) of the sizing means (1) and the diameter of the inner conductor (6). (Fig. 2)
  10. Device according to Claim 7, characterized in that the diameter (d) of the annular die (2) corresponds approximately to the diameter of the inner conductor (6). (Fig. 3)
  11. Device according to any of Claims 7-10, characterized in that a gap (x) for thermal insulation, which is sufficiently small to prevent emergence of the polymer (4), is provided between the annular die (2) and the sizing means (1).
  12. Device according to any of Claims 7 to 11, characterized in that the sizing means (1) is fixed directly on the transverse extrusion head with the required gap (x).
  13. Device according to any of Claims 7 to 12, characterized in that the sizing means (1) is installed in a downstream cooling chamber (11) for cooling the polymer (5).
  14. Device according to any of Claims 7 to 12, characterized in that the sizing means (1) is a part of the extrusion head, i.e. is integrated in the extrusion head.
  15. Device according to Claim 13, characterized in that the sizing means (1) is installed in a cooling chamber (11) which is directly downstream and is under vacuum.
EP00890074A 1999-03-18 2000-03-14 Continuous manufacturing method and device for coated cables and device for carrying out this method Expired - Lifetime EP1037217B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT00890074T ATE283540T1 (en) 1999-03-18 2000-03-14 METHOD FOR THE CONTINUOUS PRODUCTION OF SHEATHED CABLES AND DEVICE FOR IMPLEMENTING THE METHOD

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT49299 1999-03-18
AT0049299A AT410610B (en) 1999-03-18 1999-03-18 METHOD FOR THE CONTINUOUS PRODUCTION OF COATED CABLES AND DEVICE FOR IMPLEMENTING THE METHOD

Publications (3)

Publication Number Publication Date
EP1037217A2 EP1037217A2 (en) 2000-09-20
EP1037217A3 EP1037217A3 (en) 2001-05-16
EP1037217B1 true EP1037217B1 (en) 2004-11-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP00890074A Expired - Lifetime EP1037217B1 (en) 1999-03-18 2000-03-14 Continuous manufacturing method and device for coated cables and device for carrying out this method

Country Status (3)

Country Link
EP (1) EP1037217B1 (en)
AT (2) AT410610B (en)
DE (1) DE50008717D1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108231292A (en) * 2017-12-29 2018-06-29 重庆腾盛电线电缆有限公司 A kind of cable extruder head simple in structure

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4089923A (en) * 1977-02-17 1978-05-16 International Telephone & Telegraph Corporation Manufacture of submarine cable
US4585603A (en) * 1982-03-15 1986-04-29 Showa Electric Wire & Cable Co., Ltd Method for controlling an extrusion line for foamed insulation cables involving use of a plurality of generated and measured electrical signals
DE3542302C1 (en) * 1985-11-27 1987-01-08 Siemens Ag Extrusion of plastic insulation onto a conductor
TW297798B (en) * 1989-03-15 1997-02-11 Sumitomo Electric Industries
JPH052936A (en) * 1991-02-05 1993-01-08 Tokyo Electric Power Co Inc:The Manufacture of power cable
JPH08249958A (en) * 1995-03-15 1996-09-27 Kobe Steel Ltd Method and equipment for manufacturing foamed insulation electric wire
JP3946280B2 (en) * 1996-01-25 2007-07-18 昭和電線ケーブルシステム株式会社 Coaxial cable insulator molding method and molding apparatus

Also Published As

Publication number Publication date
EP1037217A3 (en) 2001-05-16
DE50008717D1 (en) 2004-12-30
ATA49299A (en) 2002-10-15
ATE283540T1 (en) 2004-12-15
EP1037217A2 (en) 2000-09-20
AT410610B (en) 2003-06-25

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