EP2259270A2 - Kabelelement, Datenübertragungskabel, Herstellungsverfahren und Verwendung eines Datenübertragungskabels. - Google Patents

Kabelelement, Datenübertragungskabel, Herstellungsverfahren und Verwendung eines Datenübertragungskabels. Download PDF

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Publication number
EP2259270A2
EP2259270A2 EP10164629A EP10164629A EP2259270A2 EP 2259270 A2 EP2259270 A2 EP 2259270A2 EP 10164629 A EP10164629 A EP 10164629A EP 10164629 A EP10164629 A EP 10164629A EP 2259270 A2 EP2259270 A2 EP 2259270A2
Authority
EP
European Patent Office
Prior art keywords
cable
data transmission
shielding layer
cable element
water blocking
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
EP10164629A
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English (en)
French (fr)
Other versions
EP2259270B1 (de
EP2259270A3 (de
Inventor
Jan Tore Fjellberg
Olav Trygg Brynildsen
Mensudin Dzubur
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.)
Draka Comteq BV
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Draka Comteq BV
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Publication date
Application filed by Draka Comteq BV filed Critical Draka Comteq BV
Publication of EP2259270A2 publication Critical patent/EP2259270A2/de
Publication of EP2259270A3 publication Critical patent/EP2259270A3/de
Application granted granted Critical
Publication of EP2259270B1 publication Critical patent/EP2259270B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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

Definitions

  • the present invention relates to a cable element for high frequency data transmission comprising one single twisted pair of insulated electrical conductors surrounded by a first shielding layer thereby forming a first space between said twisted pair of insulated electrical conductors and an inner surface of said first shielding layer.
  • EP 0 572 173 relates to a communication cable having waterblocking capabilities.
  • a communication cable having waterblocking capabilities.
  • Such a cable has a plurality of metallic conductors, and one such cable comprises a plurality of individual copper conductors configured as twisted pairs. A plurality of these twisted pair conductors are tightly bundled together to create a series of units, wherein each unit is separately helically wrapped with a hydrophilic, water-absorptive yarn.
  • the cable includes a core comprising one or more pairs of insulated metallic conductors, wherein a hydrophobic material is used as a filling compound to occupy any voids or interstices remaining within the core.
  • EP 0 586 158 relates to a cable comprising a plurality of longitudinally extending transmission media including a core having a plurality of insulated metallic conductor pairs, wherein the conductors may be grouped together in units and the units assembled together into the core. Binders are used to bind together the conductors, wherein the core is disposed within a plastic material which is wrapped. The core is filled with a superabsorbent polymer in powder form.
  • GB 2 164 198 relates to an optical fibre cable comprising a plurality of insulated wires stranded together and impregnated with a water-repellent medium and having on its surface a dusting of a water blocking powder.
  • the coated wire bundle is surrounded in turn by an inner protective sheath of plastics materials extruded over the bundle, a metallic barrier strip and an outer plastics sheath extruded around the barrier strip.
  • US 6,686,537 and US 6,815,611 discloses high-performance data cables wherein on each twisted pair cable a lateral wrapped shielding tape is used, which shielding tape is bound with a fabric or metal binder to meet impedance/RL, attenuation uniformity and capacitance unbalance. By utilising this lateral wrapped shield most of the trapped air that is normally found in shielded twisted pair cables is eliminated.
  • US 2005/0077066 discloses a cable having a plurality of individually shielded twisted pairs, each individually shielded twisted pair including a shield comprised of multiple layers with a first surface and a second surface opposite the first surface.
  • the shield has a first longitudinally extending side and a second longitudinally side.
  • the shield is oriented around the twisted pair with a lateral fold or "cigarette wrap" fold.
  • a portion of the laterally wrapped shield is bonded to itself.
  • the shield forms a semi-rigid tube which encompasses the twisted pair.
  • the space between the twisted pair of insulated electrical conductors and the first shielding layer in the cables according to the prior art is filled with air.
  • water may diffuse or leak into this space between the twisted pair of insulated electrical conductors and the first shielding layer.
  • the disturbance or loss of data transmission is ascribed to a too high level of dielectric loss (L), defined as the product of the relative dielectric permittivity (E) and the dissipation factor (D). This dielectric loss depends on the frequency and temperature at which the cable element is operated.
  • a further problem associated with outdoor use of cables according to the prior art is that cable performance may be jeopardised due to application of outside forces or movements.
  • An object of the present invention is to provide an improved data transmission cable comprising cable elements that can be used in outdoor conditions preferably without impairing data transmission performance of the cable.
  • Another object of the invention is to provide a data transmission cable which is resistant to deformation.
  • the present invention is characterised in that at least part of the first space between the single twisted pair and an inner surface of the first shielding layer comprises a water blocking compound.
  • the presence of the water blocking compound in the first space blocks water from penetrating in the first space of the cable element. Likewise, even under circumstances where water would enter part of the first space, the water blocking compound will prevent further penetration inside the cable element in longitudinal direction thereof.
  • the present inventors have surprisingly found that a certain increase in dielectric loss, which loss increase is the result of the presence of the water blocking compound in the first space between the twisted pair of insulated electrical conductors and an inner surface of the first shielding layer, will not result in significant loss of data transmission performance.
  • a cable element according to the present invention is more resistant to mechanical deformation.
  • the relative dielectric permittivity of the water blocking compound is less than or equal to 4 and even more preferably less than or equal to 3 at the frequency and temperature at which the element is operated. Operating temperatures may be specified to be between -40 °C and 70 °Celsius.
  • the dissipation factor of the water blocking compound is lower than or equal to 0.001 at the frequency and temperature at which the cable element is operated. If the dissipation factor of the water blocking compound is higher than 0.001, transmission loss increases towards an unacceptable level.
  • the water blocking compound may be in the form of a gel such as for example a petroleum based gel or a silicone based gel, or in the form of a hotmelt.
  • a hotmelt as used hereinafter is defined as a material which at room temperature is a solid, whereas it can flow upon elevated temperatures, for example temperatures above 80 ° or even above 100 °Celsius.
  • the water blocking compound is a hotmelt and more preferably a hotmelt adhesive.
  • a hotmelt adhesive binds to both the insulated electrical conductors of the twisted pair and the first shielding layer.
  • the hotmelt is an elastomer-based adhesive.
  • the hotmelt is a polyurethane or polyacrylate based material.
  • Such embodiment allows the cable element to be even more resistant to mechanical deformation, which results in more reliable data transmission behaviour, i.e. disturbance or loss of data transmission as a result of mechanical loads applied on the data transmission cable are reduced to a minimum.
  • a further advantage of a hotmelt is that such a material is relatively easy to handle when compared to for example gels. This is particularly relevant for the craftsman who has to splice or connectorise a cable in the field. He can remove the hotmelt from the twisted pair relatively easy without having the risk of soiling his hands, tools or clothes.
  • Yet another advantage of using a hotmelt material is that such a material can be processed relatively easy and enables production speeds comparable to those of conventional unfilled cable elements.
  • the water blocking compound in the cable element of the present invention should not be confused with a water swellable material. More in particular, the present water blocking material is not a water swellable material.
  • a water swellable material will swell under the influence of water and thereby effectively block penetration of water both in radial and longitudinal direction of a cable or cable element.
  • water swellable materials When first applied in a cable element during its manufacturing process, such water swellable materials may not result in disturbance or loss of data transmission at the operational frequency and temperature.
  • the water swellable material when in use, may absorb water and as a result the overall composition of the thus obtained water swellable material contains water.
  • the first shielding layer is at least partly in contact with the single twisted pair of insulated electrical conductors.
  • the single first shielding layer thus surrounds the single twisted pair relatively tightly, however still forms a first space between an inner surface of the first shielding layer and an outer surface of the single twisted pair of insulated electrical conductors.
  • the first shielding layer is applied around the single twisted pair of insulated electrical conductors for the purpose of electrical shielding, more in particular for the purpose of reducing crosstalk phenomena.
  • the present invention is restricted to a cable element wherein the two insulated electrical conductors are twisted around and in intimate contact with each other in longitudinal direction.
  • Such construction comprises additionally a shielding layer, said shielding layer surrounding only one single twisted pair of insulated electrical conductors.
  • the first shielding layer consists of or comprises an electrically conductive material, preferably a metal.
  • Embodiments of suitable shielding layers are aluminum laminated plastic foils. Further exemplary embodiments of the shielding layer are represented by the screening sheet as disclosed in US 2006/004896 or the shield system disclosed in WO 2006/105166 . All these embodiments are hereby specifically incorporated by reference.
  • the water blocking compound completely fills the first space along the length of the cable element, thereby making it impossible at any location along the length of the cable element for water to enter the first space.
  • the present invention further relates to a data transmission cable comprising at least one cable element according to the present invention wherein said at least one cable element is surrounded by an extruded outer sheath, the outer sheath defining a second space between an inner surface of the outer sheath and an outer surface of the at least one cable element.
  • the data transmission cable according to the invention consists of four cable elements.
  • the data transmission cable according to the invention may further comprise a second shielding layer surrounding the at least one cable element wherein said second shielding layer is surrounded by the outer sheath.
  • the second shielding layer should not be confused with the first shielding layer surrounding the twisted pair of insulated electrical conductors.
  • the second shielding layer is not to be considered a part of the cable element and also does not directly surround the single twisted pair of insulated electrical conductors. In the embodiment where the data transmission cable comprises more than one cable element the second shielding layer surrounds all the cable elements.
  • At least one water swellable and/or at least one water blocking material may further be present.
  • the present inventors found that in the presence of such further water swellable and/or water blocking materials an even more robust and waterproof cable is obtained.
  • the data transmission cable and accordingly the cable elements according to the invention operate at relative high frequencies of at least 1 MHz preferably in a range from 1 to 1000 MHz more preferably from 100 to 1000 MHz.
  • the data transmission cable according to the invention may be of the type Cat. 5, Cat. 5e, Cat. 6, Cat. 6a, Cat. 7, Cat. 7a as defined in international standard IEC 61156-5.
  • the data transmission cable according to the invention does not contain strengthening or reinforcing elements such as longitudinal dielectric strength members, aramid yarns, glass reinforced rods and the like.
  • the data transmission cable according to the invention may be used as such, i.e. require no further circumferential layers or sheaths.
  • the data transmission cable according to the invention allows use at least partially in outdoor conditions, i.e. in conditions where the cable may be exposed to water or humidity at varying temperatures.
  • FIG. 1 shows a schematic representation of a cable element 10 according to the present invention comprising one single twisted pair of two insulated electrical conductors 1, hereinafter referred to as twisted pair 1.
  • twisted pair 1 Each of the two insulated electrical conductors of twisted pair 1 comprises a conductive core 2 covered by a layer of insulation 3.
  • the two insulated electrical conductors of twisted pair 1 pair are twisted around and consequently in intimate contact with each other in longitudinal direction. No other conductors or elements form part of twisted pair 1.
  • Conductive core 2 may have a diameter ranging from approximately 400 ⁇ m to 700 ⁇ m, depending on the application.
  • Conductive core 2 may be of the solid type, i.e. consisting of a single wire of conductive material.
  • conductive core 2 is of the stranded type, wherein several strands of conductive material are stranded.
  • conductive core 2 may consist of seven strands where six strands are laid around a central strand.
  • Conductive core 2 sometimes referred to as core wire or wire is of an electrical conductive material, preferably a metal such as copper, plated copper, copper alloy or aluminum.
  • Insulation layer 3 may be made of a polymer material or a polymer compound comprising a polymer material such as polyethylene, polypropylene, ethylene-propylene copolymers, polyvinylchloride, fluor plastics such as polytetrafluorethylene.
  • a polymer compound in this context should be understood to mean a polymer material whereto one or more additives are added. Examples of such additives are UV stabilisers, antioxidants, pigments, dies, flame retardant additives and filler materials like talc and fused silica.
  • Insulation layer 3 may be solid or may be foamed, i.e. contain small air pockets.
  • the wall thickness of insulation layer 3 may be between 200 and 600 ⁇ m depending on the application. Insulation layer 3 may be applied on conductive core 2 by means of extrusion and completely surrounds and is preferably in direct contact with conductive core 2.
  • Twisted pair 1 is surrounded by first shielding layer 4 defining first space 5 between first shielding layer 4 and twisted pair 1.
  • first space 5 basically consists of two distinct areas and as such first space 5 corresponds to the space enclosed by shielding layer 4 minus the space occupied by twisted pair 1.
  • shielding layer 4 is regarded as surrounding single twisted pair 1 directly.
  • a water blocking compound (not shown) is present in first space 5.
  • the water blocking compound is a hotmelt adhesive marketed under the brand name INSTANT-FLEX X47 by National Starch & Chemical.
  • This hotmelt material has proven to effectively block water and provide mechanical stability for cable element 10.
  • this hotmelt material is relatively easy to peel off by hand when an end of cable element 10 needs to be spliced or connectorised in the field. No solvent is necessary.
  • Figure 2 shows a data transmission cable 20 consisting of four cable elements 10 according to the present invention surrounded by second shielding layer 12. Cable elements 10 may be laid in parallel or may be stranded around each other either in the form of a helix or in an SZ configuration as known per se. Data transmission cable 20 is not restricted to the specific number of four cable elements 10, but any number can be used, e.g. two, four or even twenty cable elements 10 can be present within second shielding layer 12. In addition data transmission cable 20 can be grouped together with other data transmission cables 20 forming a communication cable (not shown).
  • Such a communication cable may comprise a central strength member wherein several data transmission cables 20 are stranded around in the form of a helix or in an SZ configuration, and eventually surrounded by an outer plastic sheath. Within such a communication cable the number of cable element 10 present in these data transmission cables 20 may differ from data transmission cable 20 to data transmission cable 20
  • Second shielding layer 12 may be in the form of a tape that has been wrapped around cable elements 10.
  • second shielding layer 12 in the form of a tape may be folded in longitudinal direction so as to form a tube like structure.
  • Second shielding layer 12 comprises a conductive material, such as a metal and may be in the form of a braid of relative thin metal threads, for example made of copper.
  • Second shielding layer 12 and cable elements 10 are surrounded by outer sheath 11.
  • Outer sheath 11 may be of a polymer material or a polymer compound comprising a polymer material such as polyethylene, polypropylene, ethylene-propylene copolymers, polyvinylchloride, polyurethane.
  • second shielding layer 12 is positioned tightly against the inner surface of outer sheath 11. It has to be understood that other configurations can also be envisaged which embodiments allow a certain radial distance between second shielding layer 12 and the inner wall of outer sheath 11.
  • Outer sheath 11 defines a second space 13 between an inner surface of outer sheath 11 and an outer surface of cable elements 10.
  • Second space 13 corresponds to the space enclosed by outer sheath 11 minus the space occupied by cable elements 10 minus the space occupied by second shielding layer 12, if present.
  • Second space 13 may contain further water blocking and/or water swellable materials (not shown).
  • Figure 3 schematically shows a production line for use in a method for manufacturing of the cable elements according to the present invention.
  • First shielding layer 4 in the form of a tape is combined with one single twisted pair 1 and fed to die 30.
  • a water blocking compound is applied on the combined first shielding layer 4 and twisted pair 1.
  • the combined first shielding layer 4 twisted pair 1 and water blocking compound is fed to a folding device or folding die 31.
  • folding device 31 the tape forming first shielding layer 4 is folded in such a manner that a cable element 10 is obtained, wherein twisted pair 1 and the water blocking compound are surrounded by first shielding layer 4, wherein the water blocking compound is present in the first space created by the first shielding layer 4 and the twisted pair 1.
  • the present invention is not limited to a first shielding layer manufactured in this way and that other methods known in the art may be applied.

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  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
EP10164629.7A 2009-06-02 2010-06-01 Kabelelement, Datenübertragungskabel, Herstellungsverfahren und Verwendung eines Datenübertragungskabels. Active EP2259270B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1037007A NL1037007C2 (en) 2009-06-02 2009-06-02 Cable element, data transmission cable, method for manufacturing and use of data transmission cable.

Publications (3)

Publication Number Publication Date
EP2259270A2 true EP2259270A2 (de) 2010-12-08
EP2259270A3 EP2259270A3 (de) 2011-12-14
EP2259270B1 EP2259270B1 (de) 2013-12-25

Family

ID=41449994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10164629.7A Active EP2259270B1 (de) 2009-06-02 2010-06-01 Kabelelement, Datenübertragungskabel, Herstellungsverfahren und Verwendung eines Datenübertragungskabels.

Country Status (5)

Country Link
EP (1) EP2259270B1 (de)
DK (1) DK2259270T3 (de)
ES (1) ES2452520T3 (de)
NL (1) NL1037007C2 (de)
PT (1) PT2259270E (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2800105A1 (de) * 2013-04-29 2014-11-05 Siemens Aktiengesellschaft Konfektionierbares Datenübertragungskabel
WO2018228911A1 (de) * 2017-06-16 2018-12-20 Leoni Kabel Gmbh Datenkabel für explosionsgefährdete bereiche

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164198A (en) 1984-09-05 1986-03-12 Telephone Cables Ltd Cables
EP0572173A1 (de) 1992-05-29 1993-12-01 AT&T Corp. Nachrichtenkabel mit Wassersperrvermögen
EP0586158A1 (de) 1992-08-31 1994-03-09 AT&T Corp. Kabel mit wasserblockierendem Material
US6686537B1 (en) 1999-07-22 2004-02-03 Belden Wire & Cable Company High performance data cable and a UL 910 plenum non-fluorinated jacket high performance data cable
US6815611B1 (en) 1999-06-18 2004-11-09 Belden Wire & Cable Company High performance data cable
US20050077066A1 (en) 1999-08-31 2005-04-14 Stipes Jason A. High speed data cable having individually shielded twisted pairs
US20060004896A1 (en) 2004-06-16 2006-01-05 International Business Machines Corporation Managing unwanted/unsolicited e-mail protection using sender identity
WO2006105166A2 (en) 2005-03-28 2006-10-05 Leviton Manufacturing Co., Inc. Discontinuous cable shield system and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005073983A1 (en) * 2004-01-27 2005-08-11 3M Innovative Properties Company Filling materials

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2164198A (en) 1984-09-05 1986-03-12 Telephone Cables Ltd Cables
EP0572173A1 (de) 1992-05-29 1993-12-01 AT&T Corp. Nachrichtenkabel mit Wassersperrvermögen
EP0586158A1 (de) 1992-08-31 1994-03-09 AT&T Corp. Kabel mit wasserblockierendem Material
US6815611B1 (en) 1999-06-18 2004-11-09 Belden Wire & Cable Company High performance data cable
US6686537B1 (en) 1999-07-22 2004-02-03 Belden Wire & Cable Company High performance data cable and a UL 910 plenum non-fluorinated jacket high performance data cable
US20050077066A1 (en) 1999-08-31 2005-04-14 Stipes Jason A. High speed data cable having individually shielded twisted pairs
US20060004896A1 (en) 2004-06-16 2006-01-05 International Business Machines Corporation Managing unwanted/unsolicited e-mail protection using sender identity
WO2006105166A2 (en) 2005-03-28 2006-10-05 Leviton Manufacturing Co., Inc. Discontinuous cable shield system and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2800105A1 (de) * 2013-04-29 2014-11-05 Siemens Aktiengesellschaft Konfektionierbares Datenübertragungskabel
WO2018228911A1 (de) * 2017-06-16 2018-12-20 Leoni Kabel Gmbh Datenkabel für explosionsgefährdete bereiche
US20200194145A1 (en) * 2017-06-16 2020-06-18 Leoni Kabel Gmbh Data cable for areas at risk of explosion
US10930415B2 (en) 2017-06-16 2021-02-23 Leoni Kabel Gmbh Data cable for areas at risk of explosion
DE102017210096B4 (de) 2017-06-16 2024-02-08 Bizlink Industry Germany Gmbh Datenkabel für explosionsgefährdete Bereiche

Also Published As

Publication number Publication date
NL1037007C2 (en) 2010-12-07
EP2259270B1 (de) 2013-12-25
DK2259270T3 (en) 2014-03-17
EP2259270A3 (de) 2011-12-14
PT2259270E (pt) 2014-03-25
ES2452520T3 (es) 2014-04-01

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