EP0905716A1 - Cable covered with a solid lubricant - Google Patents

Cable covered with a solid lubricant Download PDF

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Publication number
EP0905716A1
EP0905716A1 EP98402292A EP98402292A EP0905716A1 EP 0905716 A1 EP0905716 A1 EP 0905716A1 EP 98402292 A EP98402292 A EP 98402292A EP 98402292 A EP98402292 A EP 98402292A EP 0905716 A1 EP0905716 A1 EP 0905716A1
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EP
European Patent Office
Prior art keywords
cable
sheath
deposition chamber
lubricant
lubricating material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98402292A
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German (de)
French (fr)
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EP0905716B1 (en
Inventor
Jean-Pierre Bonicel
Olivier Tatat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel CIT SA
Alcatel Lucent SAS
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Alcatel CIT SA
Alcatel SA
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Publication of EP0905716A1 publication Critical patent/EP0905716A1/en
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Publication of EP0905716B1 publication Critical patent/EP0905716B1/en
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Expired - Lifetime legal-status Critical Current

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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 cable covered with a solid lubricant, such cable being intended to be installed in a tubular conduit.
  • the equipment for depositing the lubricant should be very close to the sheath extrusion head because otherwise it is not possible to check correctly the thickness of this sheath. In any event, this equipment presents a significant size and such an arrangement is not favorable for a good dimensional control of the sheath.
  • the present invention thus relates to a device for making a cable lubricated which does not significantly modify the geometrical characteristics of this cable.
  • the invention therefore relates to a device for depositing a lubricant coating. on a cable, this cable comprising a sheath produced by means of an extruder followed by a cooling tank; in addition, downstream of the cooling tank, the device includes a pretreatment device followed by a deposition chamber of a lubricating material.
  • This pretreatment member can be a reheating member or else then it can carry out a crown effect treatment of the cable sheath.
  • the lubricating material is based on polytetrafluoroethylene.
  • the lubricating material consists of microbeads.
  • this lubricating material is inorganic; for example, glass.
  • the deposition of the material lubricant is produced in a bath.
  • the deposition of the material lubricant is produced by spraying an emulsion or by spraying with by means of a gas.
  • the deposition of the material lubricant is produced by means of a calibrated die.
  • the deposition chamber is followed by an evaporation member.
  • the material lubricant not being granular this material is deposited by phase spraying plasma.
  • the invention also relates to a method for implementing the device, this method comprising a step of reheating the cable sheath and a step of depositing a lubricating material on this sheath.
  • an extruder 20 performs the cable sheath 11 from a core 10.
  • the core of a fiber cable often consists of a central carrier rod, the fibers being arranged in helical grooves formed on the periphery of the rod.
  • the cable 11 is then cooled in a cooling tank 21.
  • a cooling tank 21 As mentioned above, the layout very close to the extruder 20 and the cooling 21 is necessary to control the thickness of the sheath.
  • the cable is then directed to a processing member prior 22, to prepare the sheath for deposition.
  • This member 22 can be a heating member such as an oven or a flame, however, avoid heating the jacket to its melting point.
  • the oven temperature is appropriately selected following the process.
  • This member 22 can also perform a treatment by crown effect, that is to say that it subjects the sheath to a flow of ionized gas, air, for example.
  • the cable 11 is introduced in a deposition chamber 23 to coat the sheath with a layer of material lubricant.
  • This material has a very low coefficient of friction with respect to the internal surface of the pipe in which the cable must be engaged.
  • the deposition chamber can take the form of a bath in which the material lubricant is suspended in solvents, from a calibrated supply chain also by the material in solution, or by a spraying machine which projects this material in emulsion.
  • microbeads as taught in the second known solution cited in the introduction. These microbeads are made of material suitable, especially made of polytetrafluoroethylene. They can also be in inorganic material such as glass, quartz powder or ceramic. In this case, the deposition is carried out by spraying the microbeads which are in suspension in an emulsion or in a gas, for example compressed air, or well by means of a calibrated die.
  • the above deposition chambers are however difficult to implement to control the amount or thickness of the material deposited.
  • this chamber 23 takes the form a plasma phase spray chamber. It is possible to deposit microspheres in plasma phase with a suitable assembly which can be derived from the plasma technique used for the manufacture of fibers (preforms).
  • this technique itself causes an increase in the sheath temperature, it may happen that an independent reheating device does not is not necessary, the deposition chamber 23 ensuring the heating functions and deposit.
  • an evaporation device 24 at the outlet of the deposition chamber 23 to evaporate the solvents which served as vehicle with lubricating material.
  • This evaporation organ will generally take the shaped like an oven.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electric Cable Installation (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Application of a lubricant film to extruded cable sheath is carried out at a point downstream from the main extrusion coating and cooling units used to apply the cable sheath. A unit for producing a cable with a sheath coated with a lubricant film comprises an extruder (20) for applying an extruded sheath to a cable core (10), and a cooling unit (21) for cooling the sheathed cable (11). Downstream from the cooling unit (21) the cable passes through a pretreatment unit (22) followed by a deposition chamber (23) where the lubricant film is applied. An Independent claim is included for the process of forming a lubricant coating on extruded cable sheath by using an apparatus as shown.

Description

La présente invention concerne un câble recouvert d'un lubrifiant solide, un tel câble étant prévu pour être installé dans une conduite tubulaire.The present invention relates to a cable covered with a solid lubricant, such cable being intended to be installed in a tubular conduit.

Dans de nombreux domaines d'application et notamment en télécommunications, les câbles électriques ou à fibres optiques sont introduits dans des conduites. Il convient donc de minimiser le coefficient de frottement de ces câbles sur les parois internes des conduites.In many fields of application and in particular in telecommunications, electrical or fiber optic cables are introduced into pipes. It is therefore advisable to minimize the coefficient of friction of these cables on the internal walls of the pipes.

Une première solution connue figure dans le brevet français FR 2 674 364. Dans ce document, l'âme d'un câble passe par une première extrudeuse pour application d'une gaine conventionnelle qui est souvent en polyéthylène. L'âme gainée passe ensuite dans une seconde extrudeuse pour application d'une couche lubrifiante composite telle qu'un alliage polyéthylène-résine silicone. Le câble ainsi lubrifié passe ensuite, de manière connue, dans un bac de refroidissement.A first known solution appears in French patent FR 2 674 364. In this document, the core of a cable passes through a first extruder to application of a conventional sheath which is often made of polyethylene. The sheathed soul then passes into a second extruder for application of a lubricating layer composite such as a polyethylene-silicone resin alloy. The cable thus lubricated passes then, in known manner, in a cooling tank.

Une deuxième solution connue figure dans la demande de brevet allemand DE-44 10 456. On prévoit ici, comme dans le premier document, une extrudeuse pour revêtir l'âme du câble d'une gaine. A la suite de cette extrudeuse est disposée une chambre d'enduction pour appliquer sur la gaine encore chaude des granulés en matière dure, ces granulés devant se détacher lors de l'introduction du câble dans la conduite. Finalement, le câble enduit traverse un bac de refroidissement.A second known solution appears in the German patent application DE-44 10 456. Here, as in the first document, an extruder is provided for cover the cable core with a sheath. Following this extruder is arranged a coating chamber for applying granules in the still hot sheath hard material, these granules must come off when the cable is introduced into the conduct. Finally, the coated cable passes through a cooling tank.

En fait, selon l'une ou l'autre des deux solutions précédentes, il faut intercaler un équipement entre l'extrudeuse prévue pour réaliser la gaine et le bac de refroidissement. Il s'ensuit une modification importante de la chaíne de fabrication.In fact, according to one or the other of the two previous solutions, it is necessary to interpose a equipment between the extruder provided to make the sheath and the tank cooling. It follows an important modification of the production line.

De plus, l'équipement destiné au dépôt du lubrifiant devrait être très proche de la tête d'extrusion de la gaine car sinon il n'est pas possible de contrôler correctement l'épaisseur de cette gaine. En tout état de cause, cet équipement présente un encombrement non négligeable et un tel agencement n'est pas favorable pour une bonne maítrise dimensionnelle de la gaine.In addition, the equipment for depositing the lubricant should be very close to the sheath extrusion head because otherwise it is not possible to check correctly the thickness of this sheath. In any event, this equipment presents a significant size and such an arrangement is not favorable for a good dimensional control of the sheath.

La présente invention a ainsi pour objet un dispositif pour réaliser un câble lubrifié qui ne modifie pas sensiblement les caractéristiques géométriques de ce câble.The present invention thus relates to a device for making a cable lubricated which does not significantly modify the geometrical characteristics of this cable.

L'invention concerne donc un dispositif pour déposer un revêtement lubrifiant sur un câble, ce câble comportant une gaine réalisée au moyen d'une extrudeuse suivie d'un bac de refroidissement ; de plus, en aval du bac de refroidissement, le dispositif comprend un organe de traitement préalable suivi d'une chambre de dépôt d'un matériau lubrifiant.The invention therefore relates to a device for depositing a lubricant coating. on a cable, this cable comprising a sheath produced by means of an extruder followed by a cooling tank; in addition, downstream of the cooling tank, the device includes a pretreatment device followed by a deposition chamber of a lubricating material.

Cet organe de traitement préalable peut être un organe de réchauffage ou bien alors il peut réaliser un traitement par effet couronne de la gaine du câble .This pretreatment member can be a reheating member or else then it can carry out a crown effect treatment of the cable sheath.

Avantageusement, le matériau lubrifiant est à base de polytetrafluoroéthylène. Advantageously, the lubricating material is based on polytetrafluoroethylene.

On peut également prévoir que le matériau lubrifiant soit constitué par des microbilles.It can also be provided that the lubricating material consists of microbeads.

Dans ce cas, ce matériau lubrifiant est inorganique ; il s'agit par exemple de verre.In this case, this lubricating material is inorganic; for example, glass.

Selon un premier mode de réalisation du dispositif, le dépôt du matériau lubrifiant est réalisé dans un bain.According to a first embodiment of the device, the deposition of the material lubricant is produced in a bath.

Selon un deuxième mode de réalisation du dispositif, le dépôt du matériau lubrifiant est réalisé par pulvérisation d'une émulsion ou bien par pulvérisation au moyen d'un gaz.According to a second embodiment of the device, the deposition of the material lubricant is produced by spraying an emulsion or by spraying with by means of a gas.

Selon un troisième mode de réalisation du dispositif, le dépôt du matériau lubrifiant est réalisé au moyen d'une filière calibrée.According to a third embodiment of the device, the deposition of the material lubricant is produced by means of a calibrated die.

De préférence, la chambre de dépôt est suivie d'un organe d'évaporation.Preferably, the deposition chamber is followed by an evaporation member.

Cependant, les trois modes de réalisation précédents sont difficiles à mettre en oeuvre et ne permettent pas d'obtenir une très bonne homogénéité du matériau lubrifiant.However, the three preceding embodiments are difficult to implement. work and do not allow to obtain a very good homogeneity of the material lubricant.

Ainsi, selon un quatrième mode de réalisation du dispositif, le matériau lubrifiant n'étant pas granuleux, ce matériau est déposé par pulvérisation en phase plasma.Thus, according to a fourth embodiment of the device, the material lubricant not being granular, this material is deposited by phase spraying plasma.

L'invention concerne également un procédé pour la mise en oeuvre du dispositif, ce procédé comportant une étape de réchauffage de la gaine du câble et une étape de dépôt d'un matériau lubrifiant sur cette gaine.The invention also relates to a method for implementing the device, this method comprising a step of reheating the cable sheath and a step of depositing a lubricating material on this sheath.

L'invention apparaítra maintenant de manière plus précise dans le cadre de la description qui suit d'exemples de mise en oeuvre donnés à titre illustratif en se référant à la figure unique annexée qui représente un schéma du dispositif.The invention will now appear more precisely in the context of the description which follows of examples of implementation given by way of illustration referring to the single appended figure which represents a diagram of the device.

En référence à cette figure et selon l'art antérieur, une extrudeuse 20 réalise la gaine du câble 11 à partir d'une âme 10. A titre d'exemple, l'âme d'un câble à fibres optiques est souvent constituée d'un jonc à porteur central, les fibres étant disposées dans des rainures hélicoïdales ménagées sur la périphérie du jonc.With reference to this figure and according to the prior art, an extruder 20 performs the cable sheath 11 from a core 10. For example, the core of a fiber cable often consists of a central carrier rod, the fibers being arranged in helical grooves formed on the periphery of the rod.

Le câble 11 est ensuite refroidi dans un bac de refroidissement 21. Comme mentionné plus haut, la disposition très proche de l'extrudeuse 20 et du bac de refroidissement 21 est nécessaire pour maítriser l'épaisseur de la gaine.The cable 11 is then cooled in a cooling tank 21. As mentioned above, the layout very close to the extruder 20 and the cooling 21 is necessary to control the thickness of the sheath.

Selon l'invention, le câble est ensuite dirigé vers un organe de traitement préalable 22, pour préparer la gaine en vue du dépôt.According to the invention, the cable is then directed to a processing member prior 22, to prepare the sheath for deposition.

Cet organe 22 peut être un organe de réchauffage tel qu'un four ou une flamme, toutefois , il faut éviter de réchauffer la gaine jusqu'à son point de fusion. La température du four est choisie de manière appropriée à la suite du procédé.This member 22 can be a heating member such as an oven or a flame, however, avoid heating the jacket to its melting point. The oven temperature is appropriately selected following the process.

Cet organe 22 peut également réaliser un traitement par effet couronne, c'est à dire qu'il soumet la gaine à un flux de gaz ionisé, de l'air, par exemple. This member 22 can also perform a treatment by crown effect, that is to say that it subjects the sheath to a flow of ionized gas, air, for example.

A la sortie de cet organe de traitement préalable 22, le câble 11 est introduit dans une chambre de dépôt 23 pour revêtir la gaine d'une couche de matériau lubrifiant. Ce matériau présente un très faible coefficient de frottement vis à vis de la surface interne de la conduite dans laquelle le câble doit être engagé.At the outlet of this pretreatment member 22, the cable 11 is introduced in a deposition chamber 23 to coat the sheath with a layer of material lubricant. This material has a very low coefficient of friction with respect to the internal surface of the pipe in which the cable must be engaged.

Les produits à base de polytétrafluoroéthylène sont bien connus pour une telle caractéristique mécanique et ils conviennent donc bien dans cette application. Dans ce cas, la chambre de dépôt peut prendre la forme d'un bain dans lequel le matériau lubrifiant est en suspension dans des solvants, d'une filière calibrée alimentée également par le matériau en solution, ou bien d'une machine de pulvérisation qui projette ce matériau en émulsion.Polytetrafluoroethylene-based products are well known for such mechanical characteristic and they are therefore well suited in this application. In this case, the deposition chamber can take the form of a bath in which the material lubricant is suspended in solvents, from a calibrated supply chain also by the material in solution, or by a spraying machine which projects this material in emulsion.

On peut également utiliser des microbilles comme l'enseigne la deuxième solution connue citée dans l'introduction. Ces microbilles sont en matériau convenable, notamment en polytetrafluoroéthylène. Elles peuvent également être en matériau inorganique tel que du verre, de la poudre de quartz ou de la céramique. Dans ce cas le dépôt est réalisé par pulvérisation des microbilles qui sont en suspension dans une émulsion ou dans un gaz, de l'air comprimé par exemple, ou bien au moyen d'une filière calibrée.We can also use microbeads as taught in the second known solution cited in the introduction. These microbeads are made of material suitable, especially made of polytetrafluoroethylene. They can also be in inorganic material such as glass, quartz powder or ceramic. In this case, the deposition is carried out by spraying the microbeads which are in suspension in an emulsion or in a gas, for example compressed air, or well by means of a calibrated die.

Les chambres de dépôt ci-dessus sont toutefois difficiles à mettre en oeuvre pour maítriser la quantité ou l'épaisseur du matériau déposé.The above deposition chambers are however difficult to implement to control the amount or thickness of the material deposited.

Ainsi, selon un autre aspect de l'invention cette chambre 23 prend la forme d'une chambre de pulvérisation en phase plasma. Il est possible de déposer des microbilles en phase plasma avec un montage adapté qui peut être dérivé de la technique plasma utilisée pour la fabrication de fibres (préformes).Thus, according to another aspect of the invention, this chamber 23 takes the form a plasma phase spray chamber. It is possible to deposit microspheres in plasma phase with a suitable assembly which can be derived from the plasma technique used for the manufacture of fibers (preforms).

Par ailleurs, cette technique entraínant d'elle même une élévation de la température de la gaine, il peut arriver qu'un organe de réchauffage indépendant ne soit pas nécessaire, la chambre de dépôt 23 assurant les fonctions de réchauffage et de dépôt.In addition, this technique itself causes an increase in the sheath temperature, it may happen that an independent reheating device does not is not necessary, the deposition chamber 23 ensuring the heating functions and deposit.

Si cela s'avère nécessaire, il est possible de disposer un organe d'évaporation 24 à la sortie de la chambre de dépôt 23 pour évaporer les solvants qui servaient de véhicule au matériau lubrifiant. Cet organe d'évaporation prendra généralement la forme d'un four.If necessary, it is possible to have an evaporation device 24 at the outlet of the deposition chamber 23 to evaporate the solvents which served as vehicle with lubricating material. This evaporation organ will generally take the shaped like an oven.

L'invention ne se limite pas aux exemples de réalisations décrits ci-dessus. En particulier, il est possible de remplacer tout moyen par un moyen équivalent.The invention is not limited to the examples of embodiments described above. In particular, it is possible to replace any means by equivalent means.

Claims (14)

Dispositif pour déposer un revêtement lubrifiant sur un câble (11), ce câble comportant une gaine réalisée au moyen d'une extrudeuse (20) suivie d'un bac de refroidissement (21),
caractérisé en ce que, en aval dudit bac de refroidissement (21), il comprend un organe de traitement préalable (22) suivi d'une chambre de dépôt (23) pourvue d'un matériau lubrifiant.Device for depositing a lubricant coating on a cable (11), this cable comprising a sheath produced by means of an extruder (20) followed by a cooling tank (21),
characterized in that, downstream of said cooling tank (21), it comprises a pretreatment member (22) followed by a deposition chamber (23) provided with a lubricating material. Dispositif selon la revendication 1, caractérisé en ce que ledit organe de traitement préalable (22) est un organe de réchauffage.Device according to claim 1, characterized in that said member pre-treatment (22) is a reheating member. Dispositif selon la revendication 1, caractérisé en ce que ledit organe de traitement préalable (22) réalise un traitement par effet couronne de la gaine du câble (11).Device according to claim 1, characterized in that said member preliminary treatment (22) performs a treatment by crown effect of the sheath of the cable (11). Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit matériau lubrifiant est à base de polytetrafluoroéthylène.Device according to any one of the preceding claims, characterized in that said lubricant material is based on polytetrafluoroethylene. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit matériau lubrifiant est inorganique.Device according to any one of Claims 1 to 3, characterized in that said lubricating material is inorganic. Dispositif selon la revendication 5, caractérisé en ce que ledit matériau lubrifiant est du verre.Device according to claim 5, characterized in that said lubricating material is glass. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit matériau lubrifiant est constitué par des microbilles.Device according to any one of the preceding claims, characterized in that said lubricant material consists of microbeads. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ladite chambre de dépôt (23) consiste en un bain.Device according to any one of Claims 1 to 4, characterized in that said deposit chamber (23) consists of a bath. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ledit matériau lubrifiant se présentant sous la forme d'une émulsion, ladite chambre de dépôt (23) est une machine de pulvérisation.Device according to any one of Claims 1 to 7, characterized in that said lubricating material being in the form of an emulsion, said deposition chamber (23) is a spraying machine. Dispositif selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ladite chambre de dépôt (23) est une filière calibrée.Device according to any one of Claims 1 to 7, characterized in that said deposition chamber (23) is a calibrated die. Dispositif selon la revendication 7, caractérisé en ce que ladite chambre de dépôt (23) est une chambre de pulvérisation à gaz.Device according to claim 7, characterized in that said deposition chamber (23) is a gas spray chamber. Dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite chambre de dépôt (23) est suivie d'un organe d'évaporation (24).Device according to any one of the preceding claims, characterized in that said deposition chamber (23) is followed by an evaporation member (24). Dispositif selon l'une quelconque des revendications 1 à 4 caractérisé en ce que, ledit matériau lubrifiant n'étant pas granuleux, ladite chambre de dépôt (23) est une chambre de pulvérisation en phase plasma.Device according to any one of Claims 1 to 4, characterized in that, said lubricating material not being granular, said deposition chamber (23) is a plasma phase spray chamber. Procédé pour la mise en oeuvre du dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte une étape de traitement préalable de la gaine (22) du câble (11) et une étape de dépôt (23) d'un matériau lubrifiant sur cette gaine.Method for implementing the device according to any one of previous claims, characterized in that it comprises a step of preliminary treatment of the sheath (22) of the cable (11) and a deposition step (23) of lubricating material on this sheath.
EP98402292A 1997-09-25 1998-09-17 Cable covered with a solid lubricant Expired - Lifetime EP0905716B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9711938 1997-09-25
FR9711938A FR2768849B1 (en) 1997-09-25 1997-09-25 CABLE COVERED WITH A SOLID LUBRICANT

Publications (2)

Publication Number Publication Date
EP0905716A1 true EP0905716A1 (en) 1999-03-31
EP0905716B1 EP0905716B1 (en) 2002-04-10

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EP98402292A Expired - Lifetime EP0905716B1 (en) 1997-09-25 1998-09-17 Cable covered with a solid lubricant

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US (1) US6146699A (en)
EP (1) EP0905716B1 (en)
JP (1) JPH11167826A (en)
DE (1) DE69804738T2 (en)
FR (1) FR2768849B1 (en)

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Also Published As

Publication number Publication date
DE69804738T2 (en) 2002-11-14
EP0905716B1 (en) 2002-04-10
FR2768849B1 (en) 1999-10-22
FR2768849A1 (en) 1999-03-26
DE69804738D1 (en) 2002-05-16
US6146699A (en) 2000-11-14
JPH11167826A (en) 1999-06-22

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