EP0151900B1 - Process of manufacturing a lengthwise impervious cable - Google Patents
Process of manufacturing a lengthwise impervious cable Download PDFInfo
- Publication number
- EP0151900B1 EP0151900B1 EP84730151A EP84730151A EP0151900B1 EP 0151900 B1 EP0151900 B1 EP 0151900B1 EP 84730151 A EP84730151 A EP 84730151A EP 84730151 A EP84730151 A EP 84730151A EP 0151900 B1 EP0151900 B1 EP 0151900B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hollow bodies
- cable core
- filling
- heat
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- 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
- H01B13/32—Filling or coating with impervious material
- H01B13/322—Filling or coating with impervious material the material being a liquid, jelly-like or viscous substance
-
- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
-
- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
- H01B7/2855—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using foamed plastic
Definitions
- the invention relates to a method for producing a longitudinally sealed electrical and / or optical cable, in particular a communication cable, by filling the cable core with a filling compound which consists of a mixture of a water-repellent, wax-like substance (e.g. petrolatum) with micro-small hollow bodies there is elastic plastic.
- a filling compound which consists of a mixture of a water-repellent, wax-like substance (e.g. petrolatum) with micro-small hollow bodies there is elastic plastic.
- the filling compound called petrolat which has a dielectric constant of about 2.3, increases the operating capacity of cables filled with it by about 20%.
- Particularly good results are achieved with a filling compound made of petrolatum and micro-small hollow bodies, in which the wall of the hollow bodies consists of an elastic material such that the hollow bodies can be compressed to a volume which is less than half the original volume under the influence of greater forces and which, when these forces no longer exist, assume their original volume and shape again (DE-PS 31 50 909).
- the spatial extent of individual non-deformed hollow bodies is less than 100 ⁇ m.
- Hollow bodies of this type are produced by means of special processes from plastics on the basis of polyvinylidene chloride copolymer, the process being carried out in such a way that isobutane as the propellant gas has entered the hollow bodies and the hollow bodies have an average spatial extent (diameter) of 10 IJ.m.
- the foaming process in which the volume of the hollow body increases approximately 10-100 times, is then carried out with the supply of thermal energy.
- DE-OS 20 21 726 it is also known to mix the petrolatum with non-foamed hollow micro-bodies and to foam the hollow bodies only after the mixing process.
- High-pair cables continue to be filled with pure petroleum jelly, the viscosity of which can be varied within wide limits due to temperature changes and which, when cooled - i.e. at room temperature - is as tough as wax.
- the pure petrolat liquefied by heating can penetrate well into all cavities of the cable core due to its then low viscosity.
- the viscosity increases sharply with increasing concentration of the filler (hollow body), especially in the case of a high proportion of hollow bodies, the liquefaction of the petrolate component alone means that the viscosity can no longer be brought up to those values which are necessary for the penetration of the filler into the cavities of high-pair souls.
- the invention is therefore based on the object of specifying a method for filling the mass of the type mentioned at the outset, which also allows filling of high-pair cables with this mass.
- a mixed with foamable plastic hollow bodies heated to a temperature below which triggers the foaming of the hollow bodies, water-repellent substance is filled into the cable core and the foaming of the hollow plastic bodies is effected there by supplying additional amounts of heat.
- the water-repellent, wax-like substance will be selected so that it releases propellant gas emerging from the hollow body during the expansion process. This prevents unwanted gas pockets in the filling compound.
- the invention thus conveys to the professional world the teaching that the water-repellent, wax-like substance should not be mixed with already foamed hollow bodies, but instead used hollow bodies that are still foamable and therefore have a significantly smaller volume than already foamed hollow bodies and therefore also let it mix much more easily with the water-repellent substance.
- a filling compound initially largely retains the physical properties, in particular the viscosity, of the pure substance, because the volume fraction of the expandable hollow bodies in the filling compound can overall remain very low. Similar to the pure substance, this filling compound can be brought into a practically liquid state by increasing the temperature, it being only necessary to note that when this compound is heated, the foaming temperature of the hollow body must not be reached.
- the unexpanded hollow bodies are also mechanically much more resistant than foamed hollow bodies, which is of great importance for the stresses when working, mixing and filling the mass; This is because, particularly when pumping the mass, the hollow bodies are subjected to high mechanical loads, particularly in the pump. Such a high mechanical load also occurs in heat exchangers and during the actual filling process, especially when penetrating the narrow gaps in the cable core.
- the hollow bodies mixed with the water-repellent substance expand only after additional heat has been added.
- the cellular gas content of the filling compound is increased in such a way that at least as low values of the dielectric constant are achieved as in the previously mentioned known filling compounds of low dielectric constant.
- the point in time at which the hollow bodies expand can also be influenced favorably by counteracting the premature expansion tendency with the pressure to be applied during filling.
- the expansion of the hollow bodies within the cable core reliably fills all of their cavities.
- the expansion also leads to a residual pressure in the soul, which is suitable to compensate for any volume shrinkage of the filling compound when it cools down.
- the diameter of the cable core can be fixed by spinning with a holding spiral before adding the additional amount of heat.
- Filling with the new filling compound can also be carried out in such a way that the filling compound formed from the water-repellent substance and foamable hollow bodies is supplied under pressure shortly before filling with heat energy in the amount required to foam all the hollow bodies at atmospheric pressure and so that heated mixture is filled into the cable core while maintaining the pressure.
- the supply of the required amount of heat is possible more easily, and it is not necessary to pay strict attention to the fact that the filling temperature falls below the filling temperature before filling.
- the method only presupposes that the storage containers in front of the actual filling system are constructed in such a way that they can also be put under increased pressure.
- the expansion of the hollow body will take place in this case, as in the previously mentioned method, when leaving the filling chamber due to the decrease in pressure caused thereby.
- the cable core will be preheated as a precaution to prevent the filling compound from cooling down when it is filled into the cable core.
- pure petroleum jelly as is usually used for the longitudinal sealing of cables, is mixed with expandable hollow bodies, the wall of which preferably consists of a polyvinylidene chloride-acrylonitrile copolymer, in an amount of 2-5 percent by volume.
- the filling material thus produced is brought to a temperature below the expansion temperature, e.g. B. heated to less than 85 ° C, thereby placed in a practically liquid state and filled in this state with the help of known filling devices, usually under pressure, into the cable core passing through the filling device.
- the cable core can be preheated in a suitable manner immediately before entering the filling device in such a way that the heat energy supplied can cause the temperature of the filling compound to rise above the expansion temperature (for example about 100 ° C.).
- the time of the onset of expansion of the hollow body can be selected by the selected filling pressure of e.g. B. 5 to 15 bar until the thin liquid filling compound with the unexpanded hollow bodies has entered all the cavities of the cable core.
- the heat energy required for the temperature increase can also only after the filling process, for. B. can be supplied by applying RF energy to the filled cable core. It goes without saying that combinations of the possibilities mentioned here are also conceivable.
- the diameter of the cable core will be stabilized by applying a holding helix. With the help of more suitable Wipers will remove the excess mass before further processing the soul and, if necessary, for filling z. B. use low-pair cables.
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zum Herstellen eines längsdichten elektrischen und/oder optischen Kabels, insbesondere eines Nachrichtenkabels, durch Füllen der Kabelseele mit einer Füllmasse, die aus einer Mischung einer wasserabstoßenden, wachsartigen Substanz (z. B. Petrolat) mit mikrokleinen Hohlkörpern aus elastischem Kunststoff besteht.The invention relates to a method for producing a longitudinally sealed electrical and / or optical cable, in particular a communication cable, by filling the cable core with a filling compound which consists of a mixture of a water-repellent, wax-like substance (e.g. petrolatum) with micro-small hollow bodies there is elastic plastic.
Bei Kabeln besteht die Gefahr, daß sich die bei einer Beschädigung des Kabelmantels eindringende Feuchtigkeit längs des Kabels ausbreiten kann und so die elektrischen Eigenschaften des Kabels nachhaltig verschlechtert werden. Dieses Problem ist seit längerer Zeit bekannt. Es gibt daher zahlreiche Vorschläge, wie man dem Vordringen des Wassers in der, Kabelseele Einhalt gebieten kann. Aus diesen Vorschlägen hat sich in letzter Zeit mit recht gutem Erfolg das Füllen von Kabeln mit kunststoffisolierten Adern, insbesondere von Nachrichtenkabeln, mit einer als Petrolat bezeichneten wachsartigen Masse durchgesetzt (GB-PS 987 508).In the case of cables, there is a risk that the moisture penetrating if the cable sheath is damaged can spread along the cable and the electrical properties of the cable can be permanently impaired. This problem has been known for a long time. There are therefore numerous suggestions on how to stop the penetration of water in the cable core. From these proposals, the filling of cables with plastic-insulated cores, in particular communication cables, with a wax-like mass called petrolat has recently become quite successful (GB-PS 987 508).
Die als Petrolat bezeichnete Füllmasse, die eine Dielektrizitätszahl von etwa 2,3 hat, setzt aber die Betriebskapazität von damit gefüllten Kabeln um ungefähr 20 % herauf. Im Grunde ist bereits vor einiger Zeit vorgeschlagen worden, dieser Füllmasse mikrokleine Hohlkörper beizumischen, um so gasgefüllte, abgekapselte Bereiche im Kabel zu schaffen und damit die Dielektrizitätszahl zu verbessern (DE-PS 19 36 872). Besonders gute Erfolge werden mit einer Füllmasse aus Petrolat und mikrokleinen Hohlkörpern erzielt, bei der die Wandung der Hohlkörper aus einem elastischen Stoff solcher Art besteht, daß sich die Hohlkörper unter dem Einfluß größerer Kräfte auf ein Volumen zusammendrücken lassen, das geringer als die Hälfte des Ursprungsvolumens ist und die bei nicht mehr Vorhandensein dieser Kräfte ihr ursprüngliches Volumen und ihre Gestalt wieder annehmen (DE-PS 31 50 909). Dabei liegt die räumliche Ausdehnung einzelner nicht verformter Hohlkörper unter 100 um.The filling compound called petrolat, which has a dielectric constant of about 2.3, increases the operating capacity of cables filled with it by about 20%. Basically, it was proposed some time ago to add micro-small hollow bodies to this filling compound in order to create gas-filled, encapsulated areas in the cable and thus to improve the dielectric constant (DE-PS 19 36 872). Particularly good results are achieved with a filling compound made of petrolatum and micro-small hollow bodies, in which the wall of the hollow bodies consists of an elastic material such that the hollow bodies can be compressed to a volume which is less than half the original volume under the influence of greater forces and which, when these forces no longer exist, assume their original volume and shape again (DE-PS 31 50 909). The spatial extent of individual non-deformed hollow bodies is less than 100 μm.
Derartige Hohlkörper werden nach speziellen Verfahren aus Kunststoffen auf der Basis von Polyvinylidenchloridcopolymer hergestellt, wobei das Verfahren so geführt wird, daß in die Hohlkörper Isobutan als Treibgas gelangt ist und die Hohlkörper eine durchschnittliche räumliche Ausdehnung (Durchmesser) von 10 IJ.m aufweisen. Unter Zufuhr von Wärmeenergie wird dann der Aufschäumprozeß durchgeführt, bei dem sich das Volumen der Hohlkörper etwa auf das 10-100fache vergrößert.Hollow bodies of this type are produced by means of special processes from plastics on the basis of polyvinylidene chloride copolymer, the process being carried out in such a way that isobutane as the propellant gas has entered the hollow bodies and the hollow bodies have an average spatial extent (diameter) of 10 IJ.m. The foaming process, in which the volume of the hollow body increases approximately 10-100 times, is then carried out with the supply of thermal energy.
Eine Füllmasse mit den zuvor erwähnten Eigenschaften, die eine Dielektrizitätszahl von etwa 1,6 bis 1,3 aufweist, hat man bisher in der Weise hergestellt, daß Hohlkörper auf Kunststoffbasis zunächst aufgeschäumt und dann mit Petrolat vermischt werden. Es ist aber auch bekannt (DE-OS 20 21 726), das Petrolat mit unverschäumten Mikrohohlkörpern zu mischen und erst nach dem Mischprozeß die Hohlkörper aufzuschäumen.A filler with the properties mentioned above, which has a dielectric constant of approximately 1.6 to 1.3, has hitherto been produced in such a way that plastic-based hollow bodies are first foamed and then mixed with petroleum jelly. However, it is also known (DE-OS 20 21 726) to mix the petrolatum with non-foamed hollow micro-bodies and to foam the hollow bodies only after the mixing process.
Das bisher noch nicht befriedigend gelöste Problem bei einer solchen Füllmasse, die man auch als syntaktischen Schaum bezeichnet, besteht darin, sie in alle Hohlräume der Kabelseele bzw. des Kabels einzubringen. Diese Forderung ist besonders bei Kabeln mit sehr vielen Adern, deren Durchmesser sehr klein ist, d. h. bei sogenannten hochpaarigen Kabeln, schwer zu erfüllen.The problem that has not yet been solved satisfactorily with such a filling compound, which is also referred to as syntactic foam, consists in introducing it into all cavities in the cable core or the cable. This requirement is particularly important for cables with a large number of wires, the diameter of which is very small. H. with so-called high-pair cables, difficult to meet.
Daher hat man bisher nur niederpaarige Kabel mit der neuen Füllmasse gefüllt. Hochpaarige Kabel werden dagegen weiterhin mit reinem Petrolat gefüllt, dessen Viskosität durch Temperaturänderungen in weiten Grenzen variiert werden kann und das im abgekühlten Zustand - also etwa bei Raumtemperatur - zäh wie Wachs ist.Therefore, so far only low-pair cables have been filled with the new filling compound. High-pair cables, on the other hand, continue to be filled with pure petroleum jelly, the viscosity of which can be varied within wide limits due to temperature changes and which, when cooled - i.e. at room temperature - is as tough as wax.
Das durch Erwärmen verflüssigte, reine Petrolat kann aufgrund seiner dann niedrigen Viskosität gut in alle Hohlräume der Kabelseele eindringen. Bei Füllmassen, die aus syntaktischen Schäumen bestehen, steigt mit wachsender Konzentration des Füllstoffes (Hohlkörper) die Viskosität stark an, wobei insbesondere bei hohem Hohlkörperanteil allein durch Verflüssigung der Petrolatkomponente die Viskosität nicht mehr auf solche Werte gebracht werden kann, die für das Eindringen der Füllmasse in die Hohlräume hochpaariger Seelen erforderlich wäre.The pure petrolat liquefied by heating can penetrate well into all cavities of the cable core due to its then low viscosity. In the case of fillers consisting of syntactic foams, the viscosity increases sharply with increasing concentration of the filler (hollow body), especially in the case of a high proportion of hollow bodies, the liquefaction of the petrolate component alone means that the viscosity can no longer be brought up to those values which are necessary for the penetration of the filler into the cavities of high-pair souls.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zum Einfüllen der Masse der eingangs genannten Art anzugeben, die auch ein Füllen hochpaariger Kabel mit dieser Masse erlaubt. Zur Lösung dieser Aufgabe wird gemäß der Erfindung vorgeschlagen, daß eine mit aufschäumbaren Kunststoffhohlkörpern vermischtes, auf eine unterhalb der die Aufschäumung der Hohlkörper auslösenden Temperatur erwärmte wasserabweisende Substanz in die Kabelseele gefüllt und die Aufschäumung der Kunststoffhohlkörper dort durch Zufuhr zusätzlicher Wärmemengen bewirkt wird.The invention is therefore based on the object of specifying a method for filling the mass of the type mentioned at the outset, which also allows filling of high-pair cables with this mass. To achieve this object, it is proposed according to the invention that a mixed with foamable plastic hollow bodies, heated to a temperature below which triggers the foaming of the hollow bodies, water-repellent substance is filled into the cable core and the foaming of the hollow plastic bodies is effected there by supplying additional amounts of heat.
Dabei wird man die wasserabweisende, wachsartige Substanz so auswählen, daß sie aus dem Hohlkörper beim Expansionsprozeß austretendes Treibgas löst. Dadurch werden unerwünschte Gasnester in der Füllmasse verhindert. Außerdem kann man problemlos brennbares Treibgas verwenden, weil wegen der Sorption des Gases von der wasserabweisenden Substanz kein zündbares Gasgemisch entstehen kann.The water-repellent, wax-like substance will be selected so that it releases propellant gas emerging from the hollow body during the expansion process. This prevents unwanted gas pockets in the filling compound. In addition, one can use combustible propellant gas without any problems because, due to the sorption of the gas by the water-repellent substance, no ignitable gas mixture can arise.
Die Erfindung vermittelt so der Fachwelt die Lehre, die wasserabweisende, wachsartige Substanz nicht mit bereits aufgeschäumten Hohlkörpern zu mischen, sondern anstelle dessen Hohlkörper zu verwenden, die noch aufschäumbar sind und daher ein wesentlich geringeres Volumen aufweisen als bereits aufgeschäumte Hohlkörper und sich daher auch viel leichter mit der wasserabweisenden Substanz mischen lassen. Eine solche Füllmasse behält zunächst weitgehend die physikalischen Eigenschaften, insbesondere der Viskosität, der reinen Substanz, weil der Volumenanteil der expandierbaren Hohlkörper an der Füllmasse insgesamt sehr gering bleiben kann. Diese Füllmasse kann also ähnlich wie die reine Substanz durch Temperaturerhöhung in einen praktisch flüssigen Zustand gebracht werden, wobei lediglich zu beachten ist, daß beim Erwärmen dieser Masse die Verschäumtemperatur der Hohlkörper nicht erreicht werden darf.The invention thus conveys to the professional world the teaching that the water-repellent, wax-like substance should not be mixed with already foamed hollow bodies, but instead used hollow bodies that are still foamable and therefore have a significantly smaller volume than already foamed hollow bodies and therefore also let it mix much more easily with the water-repellent substance. Such a filling compound initially largely retains the physical properties, in particular the viscosity, of the pure substance, because the volume fraction of the expandable hollow bodies in the filling compound can overall remain very low. Similar to the pure substance, this filling compound can be brought into a practically liquid state by increasing the temperature, it being only necessary to note that when this compound is heated, the foaming temperature of the hollow body must not be reached.
Die nicht expandierten Hohlkörper sind außerdem mechanisch erheblich widerstandsfähiger als aufgeschäumte Hohlkörper, was für die Beanspruchungen beim Bearbeiten, Mischen und Einfüllen der Masse von großer Bedeutung ist; denn gerade beim Fördern der Masse werden die Hohlkörper insbesondere in der Pumpe mechanisch hoch belastet. Eine solche hohe mechanische Belastung tritt auch in Wärmetauschern und beim eigentlichen Füllprozeß auf, insbesondere beim Durchdringen der engen Spalte in der Kabelseele.The unexpanded hollow bodies are also mechanically much more resistant than foamed hollow bodies, which is of great importance for the stresses when working, mixing and filling the mass; This is because, particularly when pumping the mass, the hollow bodies are subjected to high mechanical loads, particularly in the pump. Such a high mechanical load also occurs in heat exchangers and during the actual filling process, especially when penetrating the narrow gaps in the cable core.
Erst nach dem Zuführen zusätzlicher Wärmemenge expandieren die mit der wassereabweisenden Substanz gemischten Hohlkörper. Dabei wird der zellulare Gasanteil der Füllmasse so erhöht, daß mindesten so niedrige Werte der Dielektrizitätszahl erreicht werden wie bei den zuvor erwähnten bekannten Füllmassen niedriger Dielektrizitätszahl.The hollow bodies mixed with the water-repellent substance expand only after additional heat has been added. The cellular gas content of the filling compound is increased in such a way that at least as low values of the dielectric constant are achieved as in the previously mentioned known filling compounds of low dielectric constant.
Den Zeitpunkt des Expandierens der Hohlkörper, nämlich nach Beendigung des Füllvorganges, kann man dabei auch dadurch günstig beeinflussen, daß man mit dem beim Füllen aufzubringenden Druck der vorzeitigen Expansionstendenz entgegenwirkt. Durch die Expansion der Hohlkörper innerhalb der Kabelseele werden alle ihre Hohlräume zuverlässig ausgefüllt. Die Expansion führt außerdem zu einem Restdruck in der Seele, der geeignet ist, einen eventuellen Volumenschrumpf der Füllmasse bei ihrem Erkalten zu kompensieren.The point in time at which the hollow bodies expand, namely after the filling process has ended, can also be influenced favorably by counteracting the premature expansion tendency with the pressure to be applied during filling. The expansion of the hollow bodies within the cable core reliably fills all of their cavities. The expansion also leads to a residual pressure in the soul, which is suitable to compensate for any volume shrinkage of the filling compound when it cools down.
Bei der Ausgestaltung der Erfindung kann man so verfahren, daß die Zufuhr einer zusätzlichen Wärmemenge durch Vorwärmung der Leiter der Kabelseele erfolgt oder daß der gefüllten Kabelseele nach Verlassen der Fülleinrichtung eine zusätzliche Wärmemenge über eine Hochfrequenzanlage zugeführt wird.In the embodiment of the invention, one can proceed in such a way that an additional quantity of heat is supplied by preheating the conductor of the cable core or that the filled cable core is supplied with an additional quantity of heat via a high-frequency system after leaving the filling device.
Selbstverständlich sind auch andere Formen der Wärmeenergie oder verschiedene Kombinationen beim Erzeugen der zusätzlichen Wärmeenergie denkbar.Of course, other forms of thermal energy or different combinations for generating the additional thermal energy are also conceivable.
Um beim Expandieren der Hohlkörper den Durchmesser der Kabelseele nicht nachteilig zu beeinflussen, kann man vor dem Zuführen der zusätzlichen Wärmemenge den Durchmesser der Kabelseele durch Bespinnen mit einer Haltewendel fixieren.In order not to adversely affect the diameter of the cable core when expanding the hollow body, the diameter of the cable core can be fixed by spinning with a holding spiral before adding the additional amount of heat.
Man kann das Füllen mit der neuen Füllmasse aber auch so durchführen, daß der aus der waßserabweisenden Substanz und verschäumbaren Hohlkörpern gebildeten Füllmasse unter Druck kurz vor dem Füllen Wärmeenergie in der Menge zugeführt wird, die bei Atmosphärendruck zum Aufschäumen aller Hohlkörper erforderlich ist und daß die so erwärmte Mischung unter Beibehaltung des Druckes in die Kabelseele gefüllt wird. Auf diese Weise ist die Zufuhr der erforderlichen Wärmemenge leichter möglich, und es braucht vor dem Füllen auch nicht streng auf die Unterschreitung der Aufschäumtemperatur der Füllmasse geachtet zu werden. Das Verfahren setzt lediglich voraus, daß die Vorratsbehälter vor der eigentlichen Füllanlage so konstruiert sind, daß sie ebenfalls unter einen erhöhten Druck gesetzt werden können. Die Expansion der Hohlkörper wird in diesem Falle wie im zuvor erwähnten Verfahren beim Verlassen der Füllkammer durch die dadurch bedingte Druckabnahme erfolgen. Auch in diesem Falle wird man vorsorglich die Kabelseele einer Vorerwärmung unterwerfen, um ein Abkühlen der Füllmasse beim Einfüllen in die Kabelseele zu verhindern.Filling with the new filling compound can also be carried out in such a way that the filling compound formed from the water-repellent substance and foamable hollow bodies is supplied under pressure shortly before filling with heat energy in the amount required to foam all the hollow bodies at atmospheric pressure and so that heated mixture is filled into the cable core while maintaining the pressure. In this way, the supply of the required amount of heat is possible more easily, and it is not necessary to pay strict attention to the fact that the filling temperature falls below the filling temperature before filling. The method only presupposes that the storage containers in front of the actual filling system are constructed in such a way that they can also be put under increased pressure. The expansion of the hollow body will take place in this case, as in the previously mentioned method, when leaving the filling chamber due to the decrease in pressure caused thereby. In this case too, the cable core will be preheated as a precaution to prevent the filling compound from cooling down when it is filled into the cable core.
Die Erfindung wird anhand eines Beispieles im einzelnen erläutert.The invention is explained in detail using an example.
Zunächst werden reinem Petrolat, wie es üblicherweise zum Längsdichten von Kabeln Verwendung findet, epandierbare Hohlkörper, deren Wandung vorzugsweise aus einem Polyvinylidenchlorid-Acrylnitril-Copolymer besteht, in einer Menge von 2 - 5 Volumenprozent beigemischt. Die so hergestellte Füllmasse wird auf eine Temperatur unterhalb der Expansionstemperatur, z. B. kleiner als 85° C, erwärmt, dabei in einen praktisch flüssigen Zustand versetzt und in diesem Zustand mit Hilfe bekannter Füllvorrichtungen meist unter Druck in die die Füllvorrichtung durchlaufende Kabelseele eingefüllt. Dabei kann die Kabelseele unmittelbar vor dem Einlaufen in die Füllvorrichtung in geeigneter Weise derart vorgewärmt werden, daß die zugeführte Wärmeenergie die Temperatur der Füllmasse über die Expansionstemperatur (z. B. etwa 100°C) steigen lassen kann. Der Zeitpunkt der einsetzenden Expansion der Hohlkörper kann durch den gewählten Fülldurck von z. B. 5 bis 15 bar solange hinausgeschoben werden, bis die dünnflüssige Füllmasse mit den noch nicht expandierten Hohlkörpern in alle Hohlräume der Kabelseele gelangt ist.First of all, pure petroleum jelly, as is usually used for the longitudinal sealing of cables, is mixed with expandable hollow bodies, the wall of which preferably consists of a polyvinylidene chloride-acrylonitrile copolymer, in an amount of 2-5 percent by volume. The filling material thus produced is brought to a temperature below the expansion temperature, e.g. B. heated to less than 85 ° C, thereby placed in a practically liquid state and filled in this state with the help of known filling devices, usually under pressure, into the cable core passing through the filling device. The cable core can be preheated in a suitable manner immediately before entering the filling device in such a way that the heat energy supplied can cause the temperature of the filling compound to rise above the expansion temperature (for example about 100 ° C.). The time of the onset of expansion of the hollow body can be selected by the selected filling pressure of e.g. B. 5 to 15 bar until the thin liquid filling compound with the unexpanded hollow bodies has entered all the cavities of the cable core.
Die für die Temperatursteigerung erforderlich Wärmeenergie kann aber auch erst nach beendetem Füllvorgang z. B. durch Beaufschlagung der gefüllten Kabelseele mit HF-Energie zugeführt werden. Es versteht sich, daß auch Kombinationen der hier erwähnten Möglichkeiten denkbar sind.The heat energy required for the temperature increase can also only after the filling process, for. B. can be supplied by applying RF energy to the filled cable core. It goes without saying that combinations of the possibilities mentioned here are also conceivable.
Unmittelbar vor oder beim Einsetzen des Expansionsprozesses wird man den Durchmesser der Kabelseele durch Aufbringen einer Haltewendel stabilisieren. Mit Hilfe geeigneter Abstreifer wird man die überschüssige Masse vor der Weiterbehandlung der Seele entfernen und gegebenenfalls zum Füllen z. B. niederpaariger Kabel verwenden.Immediately before or when the expansion process begins, the diameter of the cable core will be stabilized by applying a holding helix. With the help of more suitable Wipers will remove the excess mass before further processing the soul and, if necessary, for filling z. B. use low-pair cables.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84730151T ATE28530T1 (en) | 1984-02-06 | 1984-12-21 | METHOD OF MAKING A LONGITUDINALLY WATERPROOF CABLE. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3404488 | 1984-02-06 | ||
DE19843404488 DE3404488A1 (en) | 1984-02-06 | 1984-02-06 | METHOD AND FILLING SUBSTANCE FOR PRODUCING A LONG-TERM WATERPROOF CABLE |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0151900A2 EP0151900A2 (en) | 1985-08-21 |
EP0151900A3 EP0151900A3 (en) | 1985-09-18 |
EP0151900B1 true EP0151900B1 (en) | 1987-07-22 |
Family
ID=6227159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84730151A Expired EP0151900B1 (en) | 1984-02-06 | 1984-12-21 | Process of manufacturing a lengthwise impervious cable |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0151900B1 (en) |
AT (1) | ATE28530T1 (en) |
DE (2) | DE3404488A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6894218B2 (en) | 2000-04-03 | 2005-05-17 | Lantor B.V. | Cable tape and method for manufacturing a cable tape |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3431617A1 (en) * | 1984-08-28 | 1986-03-06 | Fa. Lisa Dräxlmaier, 8313 Vilsbiburg | Moisture-proof line bushing |
DE3631250C2 (en) * | 1986-09-13 | 1994-03-24 | Kabelmetal Electro Gmbh | Flame retardant indoor cable |
IN169926B (en) * | 1986-12-11 | 1992-01-11 | Lantor Bv | |
FR2609835B1 (en) * | 1987-01-20 | 1992-03-13 | Nordlys | SEALING MATERIAL AND ITS APPLICATION TO THE CABLE INDUSTRY |
SE9804330D0 (en) * | 1998-12-15 | 1998-12-15 | Volvo Lastvagnar Ab | Method and device for cable protection of a vehicle cabling |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1564336A (en) * | 1967-05-23 | 1969-04-18 | ||
DE1936872B2 (en) * | 1969-07-15 | 1972-04-20 | Siemens AG, 1000 Berlin u 8000 München | LONGITUDINAL MESSAGE CABLE WITH PLASTIC-INSULATED CORES |
DE2019074A1 (en) * | 1970-04-21 | 1971-11-11 | Kabel Metallwerke Ghh | Insulated telephone cable |
US3683104A (en) * | 1971-01-07 | 1972-08-08 | Dow Chemical Co | Heat resistant cable |
DE3048912C2 (en) * | 1980-12-19 | 1982-10-28 | Siemens AG, 1000 Berlin und 8000 München | Longitudinally sealed electrical cable and process for its manufacture |
DE3150911C1 (en) * | 1981-12-18 | 1983-05-05 | Siemens AG, 1000 Berlin und 8000 München | Filling substance for longitudinal sealing of electrical and / or optical cables and wires |
DE3150909C2 (en) * | 1981-12-18 | 1983-12-29 | Siemens AG, 1000 Berlin und 8000 München | Filling substance for longitudinal sealing of electrical and / or optical cables and lines |
-
1984
- 1984-02-06 DE DE19843404488 patent/DE3404488A1/en not_active Withdrawn
- 1984-12-21 DE DE8484730151T patent/DE3464979D1/en not_active Expired
- 1984-12-21 EP EP84730151A patent/EP0151900B1/en not_active Expired
- 1984-12-21 AT AT84730151T patent/ATE28530T1/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6894218B2 (en) | 2000-04-03 | 2005-05-17 | Lantor B.V. | Cable tape and method for manufacturing a cable tape |
Also Published As
Publication number | Publication date |
---|---|
ATE28530T1 (en) | 1987-08-15 |
EP0151900A3 (en) | 1985-09-18 |
DE3404488A1 (en) | 1985-08-08 |
EP0151900A2 (en) | 1985-08-21 |
DE3464979D1 (en) | 1987-08-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0151900B1 (en) | Process of manufacturing a lengthwise impervious cable | |
CH671301A5 (en) | ||
DE1933256A1 (en) | Process for producing foam | |
DE3150909C2 (en) | Filling substance for longitudinal sealing of electrical and / or optical cables and lines | |
WO1988010000A1 (en) | Filler for longitudinal sealing of electrical and/or optical cables | |
DE3048912C2 (en) | Longitudinally sealed electrical cable and process for its manufacture | |
EP0155430A1 (en) | Process for manufacturing a fill material for lengthwise water-tight electric and/or optical cable | |
DE19634360C2 (en) | Process for producing a composite molded part | |
DE2060817A1 (en) | Process for connecting or terminating electrical lines | |
DE3545521A1 (en) | DEFORMABLE MOLDED BODY AND USE THEREOF AND METHOD FOR THE PRODUCTION THEREOF | |
DE2021726B2 (en) | REMOTE COMMUNICATION CABLE WITH PLASTIC INSULATED CORES AND METHOD OF ITS MANUFACTURING | |
DE1669732A1 (en) | Electrically insulating materials and structures made from them | |
DE2459136A1 (en) | Electric cable fittings prodn. - by expanding and solidifying resin mass in mould placed around cable ends | |
DE2460718C3 (en) | Method and device for the production of a longitudinally watertight communication cable | |
DE2243615A1 (en) | LONGITUDINAL MESSAGE CABLE | |
AT331883B (en) | PROCEDURE FOR LONG WATERPROOF AN ELECTRICAL CABLE | |
DE2415635A1 (en) | Water-tight communications cable - is produced by injecting styrene monomer under outer sleeve of cable and hardening or foaming | |
DE3150911C1 (en) | Filling substance for longitudinal sealing of electrical and / or optical cables and wires | |
DE2908238C2 (en) | Process for the production of watertight and fireproof bushings for cables | |
AT361719B (en) | COMPOSITE BODY FROM AT LEAST ONE BASE LAYER AND AT LEAST ONE TOP LAYER AND METHOD FOR PRODUCING IT | |
DE2124957A1 (en) | Synthetic leather shoe - made by casting polyurethane emulsion on shaped fabric | |
DE2846061C2 (en) | Process for the production of watertight and fireproof penetrations for cables | |
DE2127496A1 (en) | Electric cables - plastics insulated against humidity | |
DE2014715A1 (en) | Process for the production of closed pong, plasticized urethane rigid foam | |
DE1704647A1 (en) | Composite foams |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): AT DE FR GB IT NL SE |
|
AK | Designated contracting states |
Designated state(s): AT DE FR GB IT NL SE |
|
17P | Request for examination filed |
Effective date: 19851009 |
|
17Q | First examination report despatched |
Effective date: 19860421 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT DE FR GB IT NL SE |
|
REF | Corresponds to: |
Ref document number: 28530 Country of ref document: AT Date of ref document: 19870815 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3464979 Country of ref document: DE Date of ref document: 19870827 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: STUDIO JAUMANN |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19871231 Year of fee payment: 4 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed | ||
ITTA | It: last paid annual fee | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19890223 Year of fee payment: 5 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 19891124 Year of fee payment: 6 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 19891130 Year of fee payment: 6 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19891222 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19900701 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19900831 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19900901 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19901221 Ref country code: AT Effective date: 19901221 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
EUG | Se: european patent has lapsed |
Ref document number: 84730151.2 Effective date: 19900830 |