GB2080998A - Telecommunications Cable - Google Patents
Telecommunications Cable Download PDFInfo
- Publication number
- GB2080998A GB2080998A GB8122308A GB8122308A GB2080998A GB 2080998 A GB2080998 A GB 2080998A GB 8122308 A GB8122308 A GB 8122308A GB 8122308 A GB8122308 A GB 8122308A GB 2080998 A GB2080998 A GB 2080998A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cable
- water
- sleeve
- powder
- telecommunications
- 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.)
- Withdrawn
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 11
- 230000008961 swelling Effects 0.000 claims abstract description 9
- 230000002411 adverse Effects 0.000 claims abstract description 5
- 229920002678 cellulose Polymers 0.000 claims abstract description 5
- 239000001913 cellulose Substances 0.000 claims abstract description 5
- 229920001083 polybutene Polymers 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 3
- 229920002153 Hydroxypropyl cellulose Polymers 0.000 claims description 6
- 239000001863 hydroxypropyl cellulose Substances 0.000 claims description 6
- 235000010977 hydroxypropyl cellulose Nutrition 0.000 claims description 6
- 229940071676 hydroxypropylcellulose Drugs 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 4
- 229920000896 Ethulose Polymers 0.000 claims description 4
- 239000001856 Ethyl cellulose Substances 0.000 claims description 4
- ZZSNKZQZMQGXPY-UHFFFAOYSA-N Ethyl cellulose Chemical compound CCOCC1OC(OC)C(OCC)C(OCC)C1OC1C(O)C(O)C(OC)C(CO)O1 ZZSNKZQZMQGXPY-UHFFFAOYSA-N 0.000 claims description 4
- 239000001859 Ethyl hydroxyethyl cellulose Substances 0.000 claims description 4
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 claims description 4
- 239000004354 Hydroxyethyl cellulose Substances 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 4
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 4
- 235000010980 cellulose Nutrition 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 4
- 235000019325 ethyl cellulose Nutrition 0.000 claims description 4
- 229920001249 ethyl cellulose Polymers 0.000 claims description 4
- 235000019326 ethyl hydroxyethyl cellulose Nutrition 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 229940071826 hydroxyethyl cellulose Drugs 0.000 claims description 4
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 229920000609 methyl cellulose Polymers 0.000 claims description 4
- 239000001923 methylcellulose Substances 0.000 claims description 4
- 235000010981 methylcellulose Nutrition 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000001993 wax Substances 0.000 claims description 4
- 240000005428 Pistacia lentiscus Species 0.000 claims description 2
- 229920002367 Polyisobutene Polymers 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 2
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 2
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 2
- 235000015110 jellies Nutrition 0.000 claims description 2
- 235000021388 linseed oil Nutrition 0.000 claims description 2
- 239000000944 linseed oil Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000012764 mineral filler Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 235000019198 oils Nutrition 0.000 claims description 2
- 235000019271 petrolatum Nutrition 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
-
- 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
- H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Insulated Conductors (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Ropes Or Cables (AREA)
Abstract
The longitudinal leaktightness of a telecommunications cable (which contains, from the core to the periphery, at least one bundle of insulated conductors 1, 2, 3, 4 coated with a hydrophobic filling substance 5, a sleeve 6, a metal screen 7 and an external sheath 9) is achieved by a powder which swells in water, dispersed in a viscous agent which does not adversely affect its swelling capacity, in a layer 10 interposed between the sleeve 6 and the metal screen 7. The powder may be a cellulose derivative and the viscous agent may be polybutene, glycerol or a water-soluble wax. The screen 7 may be of Al tape and the sleeve 6 of non-woven fibres e.g. paper. <IMAGE>
Description
SPECIFICATION
Telecommunications Cable
The present invention relates to a telecommunications cable with longitudinal leaktightness.
The users of electrical cables, and especially of telecommunications cables which are to be laid underground, require these cables to be leaktight in the longitudinal direction, so that, if water should penetrate through any opening in the protective sheath, resulting from damage to the sheath during laying or during work carried out in the zone where the cable is underground, the spread of the moisture longitudinally within the cable is restricted to as small a zone as possible adjacent the damaged portion.
It is known to achieve the longitudinal leaktightness of cables by using hydrophobic compositions of pitch-like consistency, which contain, inter alia, linseed oil, polyisobutylenes and various mineral fillers, or also hydrophobic pastes, coatings, or mastics, or various types of natural or synthetic oils, or jellies such as "petroleum jelly", the hydrophobic materials being placed inside the bundle of conductors.
The same materials can be placed between the sleeve which encloses the bundle of conduCtors, and the metal screen, but as the cable cools during extrusion, after these materials have been so applied, the contraction together with the effect of any non-uniformities in diameter do not always make it possible to obtain sufficient leaktightness.
We have now devised a telecommunications cable which takes a different approach towards achieving longitudinal leaktightness.
In accordance with the present invention, there is provided a telecommunications cable comprising, from the core to the periphery, at least one bundle of insulated conductors coated with a hydrophobic filler, a sleeve, a metal screen and an external sheath, wherein a powder which swells in water, dispersed in a viscous agent which does not adversely affect its swelling capacity, is interposed between the sleeve and the metal screen.
Preferably, this powder is deposited on the sleeve and it may comprise a cellulose derivative such as CMC (carboxymethylcellulose) or similar derivatives such as HEC (hydroxyethylcellulose),
HECMC (hydroxyethylcarboxymethylcellulose),
HPMC (hydroxypropylmethylcellulose), MC
(methylcellulose), EC (ethylcellulose), EHEC (ethyl hydroxyethylcellu lose) and HPC (hydroxy
propylcellulose), used by themselves or in any mixture (this list not implying a limitation) the powder being conveyed by a viscous agent which does not suppress its swelling capacity in the presence of water.
An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawing, the single figure of which is a cross-section through a telephone cable. In order to make the drawing easier to interpret, the relative proportions of the various components have not been observed.
From its core to its periphery, the cable comprises bundles (1,2, 3, 4) of insulated conductors, grouping together a certain number of "telephone pairs" filling substance (5) of conventional type filling the interstices between the bundles and a sleeve (6), then the sleeve (6) consisting of paper, a paper based composite material or a ribbon of non-woven fibres, an aluminium screen (7) formed of a tape wrapped around the cable with its edges extending longitudinally of the cable with an overlap (8), and an extruded sheath (9) to which the screen (7) becomes bonded.
The powder which swells in water forms an intermediate layer (10) between the screen (7) and the sleeve (6) on which it is preferably deposited before the cable is produced or at the time of production.
Amongst the various viscous agents or nondraining fluids in which the powder can be dispersed without causing it to lose its swelling capacity in the presence of water, there may be mentioned, in particular, polybutene, glycerol and water-soluble waxes.
In this manner, even if contractions occur during the cooling of the cable leaving the extruder, any subsequent intrusion of water into the zone (10) will cause the sealing product to swell and will oppose the spread of the water along the cable.
Claims
1. A telecommunications cable comprising, from the core to the periphery, at least one bundle of insulated conductors coated with a hydrophobic filler, a sleeve, a metal screen and an external sheath, wherein a powder which swells in water, dispersed in a viscous agent which does not adversely affect its swelling capacity, is interposed between the sleeve and the metal screen.
2. A telecommunications cable according to
Claim 1, wherein the powder which swells in water contains at least one cellulose derivative chosen from carboxymethylcel lu lose, hydroxyethylcell u lose, hydroxyethylcarboxymethylcellulose, hydroxypropylmethyicellulose, methyl cellulose, ethylcellulose, ethylhydroxyethyl- cellulose and hydroxypropylcellulose.
3. A telecommunications cable according to
Claim 1 or 2, wherein the viscous agent is polybutene, glycerol or a water-soluble wax.
4. A telecommunications cable substantially as herein described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. A telecommunications cable comprising, from the core to the periphery, at least one bundle of insulated conductors coated with a hydrophobic filler, a sleeve, a metal screen and an external sheath, wherein a powder which swells in water, dispersed in a viscous agent which does not adversely affect its swelling capacity, is interposed between the sleeve and the metal screen.
2. A telecommunications cable according to
Claim 1, wherein the powder which swells in water contains at least one cellulose derivative chosen from carboxymethylcel lu lose, hydroxyethylcell u lose, hydroxyethylcarboxymethylcellulose, hydroxypropylmethyicellulose, methyl cellulose, ethylcellulose, ethylhydroxyethyl- cellulose and hydroxypropylcellulose.
3. A telecommunications cable according to
Claim 1 or 2, wherein the viscous agent is polybutene, glycerol or a water-soluble wax.
4. A telecommunications cable substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8016299A FR2487107A1 (en) | 1980-07-21 | 1980-07-21 | METHOD FOR IMPROVING THE LONGITUDINAL SEALING OF TELECOMMUNICATION CABLES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2080998A true GB2080998A (en) | 1982-02-10 |
Family
ID=9244468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8122308A Withdrawn GB2080998A (en) | 1980-07-21 | 1981-07-20 | Telecommunications Cable |
Country Status (11)
| Country | Link |
|---|---|
| AR (1) | AR226901A1 (en) |
| AU (1) | AU7273581A (en) |
| BR (1) | BR8104681A (en) |
| DE (1) | DE3128779A1 (en) |
| ES (1) | ES503522A0 (en) |
| FR (1) | FR2487107A1 (en) |
| GB (1) | GB2080998A (en) |
| IT (1) | IT1136683B (en) |
| NO (1) | NO812490L (en) |
| PT (1) | PT74381B (en) |
| SE (1) | SE8104460L (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2566955A1 (en) * | 1984-06-29 | 1986-01-03 | Cables De Lyon Geoffroy Delore | Composite sealing material for an electrical cable and process for its manufacture |
| GB2164198A (en) * | 1984-09-05 | 1986-03-12 | Telephone Cables Ltd | Cables |
| GB2165690A (en) * | 1984-10-08 | 1986-04-16 | Ass Elect Ind | Electrical cables |
| FR2575110A1 (en) * | 1984-12-21 | 1986-06-27 | Intissel Sa | HYDROEXPANSIBLE COMPOSITE MATERIAL, ITS PREPARATION AND COMPOSITION FOR CARRYING OUT THE SAME, AND ITS USES |
| WO1988006741A1 (en) * | 1987-03-03 | 1988-09-07 | Union Carbide Benelux N.V. | Cable containing water-blocking material |
| WO1988008440A1 (en) * | 1987-05-01 | 1988-11-03 | Freeman Clarence S | Gel composition |
| US4963695A (en) * | 1986-05-16 | 1990-10-16 | Pirelli Cable Corporation | Power cable with metallic shielding tape and water swellable powder |
| NL9001960A (en) * | 1989-09-07 | 1991-04-02 | Felten & Guilleaume Energie | Removing traces of moisture from cable - by applying electrochemical mixt. of metal powders in or on material which swells up in water, seals cable, and decomposes water |
| US5010209A (en) * | 1988-12-20 | 1991-04-23 | Pirelli Cable Corp. | Power cable with water swellable agents and elongated metal elements outside cable insulation |
| US5218011A (en) * | 1986-03-26 | 1993-06-08 | Waterguard Industries, Inc. | Composition for protecting the contents of an enclosed space from damage by invasive water |
| US5256705A (en) * | 1986-03-26 | 1993-10-26 | Waterguard Industries, Inc. | Composition with tackifier for protecting communication wires |
| US5461195A (en) * | 1986-03-26 | 1995-10-24 | Waterguard Industries, Inc. | Filled telecommunications cable having temperature stable mutual capacitance |
| EP1577901A1 (en) * | 2004-03-10 | 2005-09-21 | Nexans | Multifilament wire |
| US7087842B2 (en) * | 1999-12-20 | 2006-08-08 | Pirelli Cavi E Sistemi S.P.A. | Electric cable resistant to water penetration |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE795126A (en) * | 1972-04-01 | 1973-05-29 | Kerpenwerk G M B H & Co | MATERIAL FOR SEALING, IN PARTICULAR ELECTRICAL CABLES, LONGITUDINALLY |
| ES202111Y (en) * | 1974-04-06 | 1976-11-01 | Standard Electrica, S. A. | IMPROVEMENTS IN ELECTRIC CABLES PROTECTED AGAINST PENETRATION OF WATER. |
| ZA786576B (en) * | 1978-11-22 | 1980-02-27 | South African Inventions | Waterproofing or insulated electric cables |
-
1980
- 1980-07-21 FR FR8016299A patent/FR2487107A1/en not_active Withdrawn
-
1981
- 1981-06-19 IT IT22434/81A patent/IT1136683B/en active
- 1981-06-26 AR AR285873A patent/AR226901A1/en active
- 1981-06-30 ES ES503522A patent/ES503522A0/en active Granted
- 1981-07-10 AU AU72735/81A patent/AU7273581A/en not_active Abandoned
- 1981-07-20 NO NO812490A patent/NO812490L/en unknown
- 1981-07-20 SE SE8104460A patent/SE8104460L/en not_active Application Discontinuation
- 1981-07-20 GB GB8122308A patent/GB2080998A/en not_active Withdrawn
- 1981-07-21 BR BR8104681A patent/BR8104681A/en unknown
- 1981-07-21 DE DE19813128779 patent/DE3128779A1/en not_active Withdrawn
-
1982
- 1982-02-03 PT PT74381A patent/PT74381B/en unknown
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2566955A1 (en) * | 1984-06-29 | 1986-01-03 | Cables De Lyon Geoffroy Delore | Composite sealing material for an electrical cable and process for its manufacture |
| GB2164198A (en) * | 1984-09-05 | 1986-03-12 | Telephone Cables Ltd | Cables |
| GB2165690A (en) * | 1984-10-08 | 1986-04-16 | Ass Elect Ind | Electrical cables |
| US4837077A (en) * | 1984-12-21 | 1989-06-06 | Intissel | Hydroexpansible composite material, the preparation thereof and a composition for its implementation as well as the uses thereof |
| FR2575110A1 (en) * | 1984-12-21 | 1986-06-27 | Intissel Sa | HYDROEXPANSIBLE COMPOSITE MATERIAL, ITS PREPARATION AND COMPOSITION FOR CARRYING OUT THE SAME, AND ITS USES |
| EP0188959A1 (en) * | 1984-12-21 | 1986-07-30 | Intissel | Composite hydroexpansible material, its manufacture and composition for the latter, as well as its uses |
| US5218011A (en) * | 1986-03-26 | 1993-06-08 | Waterguard Industries, Inc. | Composition for protecting the contents of an enclosed space from damage by invasive water |
| US5256705A (en) * | 1986-03-26 | 1993-10-26 | Waterguard Industries, Inc. | Composition with tackifier for protecting communication wires |
| US5461195A (en) * | 1986-03-26 | 1995-10-24 | Waterguard Industries, Inc. | Filled telecommunications cable having temperature stable mutual capacitance |
| US4963695A (en) * | 1986-05-16 | 1990-10-16 | Pirelli Cable Corporation | Power cable with metallic shielding tape and water swellable powder |
| JPH01502620A (en) * | 1987-03-03 | 1989-09-07 | ユニオン、カーバイド、ベネラツクス、エヌ、ブイ | cable |
| WO1988006741A1 (en) * | 1987-03-03 | 1988-09-07 | Union Carbide Benelux N.V. | Cable containing water-blocking material |
| WO1988008440A1 (en) * | 1987-05-01 | 1988-11-03 | Freeman Clarence S | Gel composition |
| US5010209A (en) * | 1988-12-20 | 1991-04-23 | Pirelli Cable Corp. | Power cable with water swellable agents and elongated metal elements outside cable insulation |
| NL9001960A (en) * | 1989-09-07 | 1991-04-02 | Felten & Guilleaume Energie | Removing traces of moisture from cable - by applying electrochemical mixt. of metal powders in or on material which swells up in water, seals cable, and decomposes water |
| US7087842B2 (en) * | 1999-12-20 | 2006-08-08 | Pirelli Cavi E Sistemi S.P.A. | Electric cable resistant to water penetration |
| EP1577901A1 (en) * | 2004-03-10 | 2005-09-21 | Nexans | Multifilament wire |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7273581A (en) | 1982-09-16 |
| ES8205075A1 (en) | 1982-06-01 |
| SE8104460L (en) | 1982-01-22 |
| ES503522A0 (en) | 1982-06-01 |
| IT1136683B (en) | 1986-09-03 |
| BR8104681A (en) | 1982-04-06 |
| IT8122434A0 (en) | 1981-06-19 |
| AR226901A1 (en) | 1982-08-31 |
| PT74381A (en) | 1982-03-01 |
| DE3128779A1 (en) | 1982-04-29 |
| NO812490L (en) | 1982-01-22 |
| FR2487107A1 (en) | 1982-01-22 |
| PT74381B (en) | 1983-09-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |