EP0809258A1 - Ame d'un câble électrique, procédé pour sa fabrication et câble électrique flexible - Google Patents

Ame d'un câble électrique, procédé pour sa fabrication et câble électrique flexible Download PDF

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Publication number
EP0809258A1
EP0809258A1 EP97107614A EP97107614A EP0809258A1 EP 0809258 A1 EP0809258 A1 EP 0809258A1 EP 97107614 A EP97107614 A EP 97107614A EP 97107614 A EP97107614 A EP 97107614A EP 0809258 A1 EP0809258 A1 EP 0809258A1
Authority
EP
European Patent Office
Prior art keywords
conductor
insulation
cable
core
wire
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
EP97107614A
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German (de)
English (en)
Other versions
EP0809258B1 (fr
Inventor
Heinz-Dieter Ickler
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.)
Baude Kabeltechnik GmbH
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Baude Kabeltechnik GmbH
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Publication date
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Application filed by Baude Kabeltechnik GmbH filed Critical Baude Kabeltechnik GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H01B7/0275—Disposition of insulation comprising one or more extruded layers of insulation

Definitions

  • the present invention relates first of all to an electrical line core as can be used, for example, in multi-core, flexible electrical cables.
  • the invention also relates to a method for producing such a line wire and a flexible electrical cable which comprises at least one such wire.
  • Typical flexible cables have the following structure:
  • One or more electrical cable cores are surrounded by an inner sheath, possibly together with a support element (core runner) running in parallel. Reinforcement is applied to this inner sheath, for example in the form of a textile braid, and a flexible outer sheath connects to this reinforcement to form the end of the cable.
  • the invention was based on the object of specifying an electrical line core and a corresponding cable, each with increased flexibility and durability (service life).
  • the wire or cable should preferably be halogen-free and have the smallest possible bending radii.
  • the electrical and the insulating properties of the line core or the cable should be competitive for a given purpose with the properties of the conventional electrical line core or cable.
  • this object is achieved by an electrical line core with the features specified in claim 1 and a corresponding electrical cable.
  • the invention is based on the surprising finding that it is possible to encase an electrical conductor with a rough outer surface, typically a stranded wire, with the formation of a line core with a thermoplastic material in such a way that the plastic covering, on the one hand, rests frictionally on the outermost conductor surfaces , on the other hand, it does not interfere with the outer free spaces of the conductor.
  • External gussets of the stranded wire of a typical cable core according to the invention are thus spanned, for example, by the insulating sheath (hereinafter also simply called insulation) and are not filled.
  • the strand is therefore longitudinally displaceable within the insulation (for example in the event of bending stress), but is not arranged so loosely within the insulation that it could be pulled out of it without any particular effort.
  • This particular arrangement of the strands means, in particular, that it can carry out a controlled relative movement within the insulation when subjected to bending stress.
  • the strand is therefore not compressed under the insulation during bending, which is why the service life of the wire, which is otherwise regularly limited by the so-called strand break, is extremely long.
  • the slidability of the strand within the insulation also enables easy stripping of the wire, which is advantageous, for example, when attaching electrical sets.
  • cables according to the invention can be produced on the basis of the mechanical and electrical advantages described, which - depending on the area of use - have a cable diameter that is up to 50% smaller and a correspondingly reduced weight in comparison to conventional cables with insulating materials based on rubber and PVC . It is clear that the reduction in the cable diameter also enables smaller minimum bending radii, which is of course advantageous in many practical situations.
  • the wires and cables according to the invention thus have a number of unexpected mechanical and electrical properties which, as a result, lead to considerable material savings and to significantly increased useful lives in comparison with conventional wires and cables otherwise having the same performance level.
  • the insulation consists of a thermoplastic polyester, preferably a modified polybutylene terephthalate (PBT).
  • PBT polybutylene terephthalate
  • the wire then has a special structural strength and / or elasticity. For example, a circular one with an outer diameter of 0.8 mm and a wall thickness of only 0.15 mm extruded PBT insulation around a corresponding strand only under considerable, in practice rarely occurring pressure, so that practically no external pressure is passed on to the strand and thus no destructive mechanical stress on the strand inside the insulation occurs. Even when a wire is flexed, no disadvantageous compression effect is generated.
  • the following table shows the core diameters and the associated wall thicknesses for some typical cores.
  • a flame-retardant and / or self-extinguishing insulating plastic is expediently selected for the wire according to the invention.
  • Such cores are particularly suitable for areas at risk of fire.
  • thermoplastic which has an effective melting range ⁇ T 15 15 ° C., preferably 20 20 ° C.
  • Such plastics have the advantage that their melting range comprises a larger temperature interval than the temperature fluctuations at the spray nozzle of a conventional extruder with a rather imprecise temperature control.
  • extruders can therefore also be used for extrusion in this case without the risk that the thermoplastic material liquefies (too far) due to uncontrollable temperature fluctuations and then penetrates, for example, into the gusset of a strand which is led out in parallel.
  • a practical example of a particularly suitable PBT plastic with an effective melting range ⁇ T ⁇ 20 ° C is the plastic Vestodur X 4159 from Hüls AG, a highly viscous, partially crystalline molding compound.
  • the term "effective melting range” is used in Within the scope of this description, the temperature interval is always understood, which is limited by the liquefaction temperature and by the transition from the hard elastic to the plastic state of the respective plastic.
  • thermoplastic materials e.g. the modified polybutylene terephthalates, not plastics with "memory” or "elastic shape memory”.
  • the cores according to the invention can thus be produced by means of a continuous extrusion process without subsequent heat treatment and have essentially constant mechanical and electrical properties even over a long length.
  • thermoplastic materials with an elastic shape memory can also be used to produce a wire according to the invention.
  • FIGS. 1 and 2 show an exemplary embodiment of a line core according to the invention, which is denoted overall by 1 in FIG. 1.
  • the wire 1 comprises a strand 3 as an electrical conductor, and this consists of a large number of thin metallic lead wires 5 which extend transversely to the cross-sectional plane shown in the longitudinal direction of the wire.
  • the ensemble of lead wires (the strand) is tightly packed and in its Entirely round shape.
  • the stranded wire is formed from individual wires, its surface (outer surface) is not smooth, but rather rough (contoured); in particular, it has gussets 7 between two respectively adjacent outer lead wires.
  • the strand is covered by a tubular insulation made of a thermoplastic polyester molding compound based on modified polybutylene terephthalate (PBT).
  • PBT polybutylene terephthalate
  • the product Vestodur X4159 from Hüls AG has proven particularly useful as a molding compound.
  • the inner surface of the insulation is - in relation to the longitudinal direction of the wire - essentially continuously in frictional or slip engagement with the locally outer surface sections of the lead wires forming the outermost layer of the strand.
  • the further contour-forming surface sections of the associated gusset 7 are tightly spanned by the insulation, cavities being formed which essentially correspond to the gusset.
  • the gussets 7 are not filled by the insulation molding compound.
  • the wire 1 can therefore be stripped particularly easily, but this is not the only advantage.
  • the structural property of the wire also allows the strand 3 and the insulation 9 to be displaced relative to one another in the longitudinal direction when subjected to bending stress. This is particularly important if you want to wind up or drum up the wire with a small radius of curvature. This is because there is advantageously no compression of the stranded wire under the insulation, the originally preferably soft-annealed lead wires do not harden, and there is therefore no breakage of the outer individual wires with subsequent stranded wire breakage. In practice, therefore, an undesirable failure of the wire according to the invention occurs only extremely rarely.
  • the insulation of the wire 1 according to the invention shown in FIGS. 1 and 2 is particularly thin-walled. This enables material savings of up to 50% without reducing the wire quality compared to conventional wires that have conventional PVC or rubber insulation around an identical strand.
  • the wires according to the invention are preferably produced by a pore-free extrusion in a tube process.
  • the core insulation is given a high structural strength, but remains elastic and resistant to impact and bending fatigue.
  • the high tensile strength of the preferred polybutylene terephthalate molding compounds (in addition to Vestodur X4159, Vestodur X7292 has also proven its worth) also ensures that any tensile stress that occurs during use is absorbed by the wire insulation and not by the stranded wire.
  • the high pressure resistance of the preferred materials ensures that the wire insulation remains round even at comparatively high pressures and thus prevents an additional friction or compression effect of the strand from occurring when a wire is flexed.
  • the conventional insulation materials such as rubber, PVC or PE have considerably lower tensile strengths and pressure resistance than this.
  • the cross section shown in FIG. 3 of a reelable cable 20 according to the invention has a centrally arranged support member which is surrounded by a total of seven line wires 21 according to the invention.
  • a four-layer jacket runs around the arrangement of the support element and the wires.
  • the inner layer of the jacket consists of a polyester sliding film 24, which allows the wires 21 to slide inside the jacket.
  • an inner jacket 26 made of polyurethane adjoins this slide film, which is particularly useful at higher nominal voltages.
  • the layer closest to the outside is a textile braid 28, which ensures high transverse stability (resistance to twisting) of the cable 20.
  • an outer jacket 30 made of polyurethane. This in Fig. 3 cable is therefore halogen-free.
  • the wires 21 are stranded in the longitudinal direction of the cable 20 with a short lay length around the preferably textile support member 22. If necessary, polyester filler threads can be located in the large-volume gussets between the wires (not shown).
  • the braid is preferably made of artificial silk.
  • the strands within the wires 21 can be, for example, very fine-stranded with cross-sectional areas of 1.5 mm 2 - 35 mm 2 or finely stranded with cross-sectional areas of 50 mm 2 - 120 mm 2 .
  • the cable diameter can be reduced by up to 50% with comparable electrical properties, which of course also results in smaller bending radii. A weight reduction of up to 50% is possible.
  • the cable shown in Fig. 3 can of course be varied in many ways. However, the use of one or more wires according to the invention is essential for its properties.
  • the wires according to the invention are preferably produced using the tube process.
  • the strands (cf. FIG. 3, FIG. 1) or other conductors (ropes etc.), which are expediently preheated at least approximately to the molding compound temperature, are fed through a central bore in the sleeve of the extruder.
  • a short cone is set for the extruded, already very tough insulation molding compound, and with this setting it lies tightly against the strand as described above.

Landscapes

  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Insulated Conductors (AREA)
EP97107614A 1996-05-24 1997-05-09 Ame d'un câble électrique, procédé pour sa fabrication et câble électrique flexible Expired - Lifetime EP0809258B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19621007 1996-05-24
DE19621007A DE19621007A1 (de) 1996-05-24 1996-05-24 Elektrische Leitungsader, Verfahren zu deren Herstellung sowie flexibles elektrisches Kabel

Publications (2)

Publication Number Publication Date
EP0809258A1 true EP0809258A1 (fr) 1997-11-26
EP0809258B1 EP0809258B1 (fr) 2000-09-13

Family

ID=7795254

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97107614A Expired - Lifetime EP0809258B1 (fr) 1996-05-24 1997-05-09 Ame d'un câble électrique, procédé pour sa fabrication et câble électrique flexible

Country Status (3)

Country Link
EP (1) EP0809258B1 (fr)
DE (2) DE19621007A1 (fr)
PL (1) PL184811B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288553A1 (fr) * 2001-08-29 2003-03-05 Leoni Protec Cable Systems GmbH Câble d'alimentation pouvant conduire un fluide, du courant et des ondes optiques pour un robot industriel
WO2004036600A1 (fr) * 2002-10-09 2004-04-29 Coroplast Fritz Müller Gmbh & Co. Kg Conducteur electrique gaine, destine notamment a des systemes antiblocage et a des capteurs pour des systemes de mesure de vitesse de rotation equipant des vehicules automobiles

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471161A (en) * 1983-02-16 1984-09-11 Essex Group, Inc. Conductor strand formed of solid wires and method for making the conductor strand
FR2687500A1 (fr) * 1992-02-13 1993-08-20 Alcatel Cuivre Cable electrique a ame de cuivre multibrins.
DE19529478A1 (de) * 1994-08-12 1996-02-15 Whitaker Corp Elektrischer Litzendraht zur Verwendung bei die Isolierung verdrängenden Kontakten

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471161A (en) * 1983-02-16 1984-09-11 Essex Group, Inc. Conductor strand formed of solid wires and method for making the conductor strand
FR2687500A1 (fr) * 1992-02-13 1993-08-20 Alcatel Cuivre Cable electrique a ame de cuivre multibrins.
DE19529478A1 (de) * 1994-08-12 1996-02-15 Whitaker Corp Elektrischer Litzendraht zur Verwendung bei die Isolierung verdrängenden Kontakten

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"PRODUKTINFORMATION HUELS.", ANNOUNCEMENT HUELS, XX, XX, 1 May 1992 (1992-05-01), XX, pages COMPLETE 02., XP000783736
AUTORENKOLLEKTIV: "KABEL- UND LEITUNGSFERTIGUNG", 20 December 1974, KOMBINAT VEB KABELWERK OBERSPREE, XP000783735

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1288553A1 (fr) * 2001-08-29 2003-03-05 Leoni Protec Cable Systems GmbH Câble d'alimentation pouvant conduire un fluide, du courant et des ondes optiques pour un robot industriel
WO2004036600A1 (fr) * 2002-10-09 2004-04-29 Coroplast Fritz Müller Gmbh & Co. Kg Conducteur electrique gaine, destine notamment a des systemes antiblocage et a des capteurs pour des systemes de mesure de vitesse de rotation equipant des vehicules automobiles

Also Published As

Publication number Publication date
DE19621007A1 (de) 1997-11-27
PL184811B1 (pl) 2002-12-31
PL320182A1 (en) 1997-12-08
EP0809258B1 (fr) 2000-09-13
DE59702335D1 (de) 2000-10-19

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