CA2346540A1 - Water-resistant cable - Google Patents

Water-resistant cable Download PDF

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Publication number
CA2346540A1
CA2346540A1 CA002346540A CA2346540A CA2346540A1 CA 2346540 A1 CA2346540 A1 CA 2346540A1 CA 002346540 A CA002346540 A CA 002346540A CA 2346540 A CA2346540 A CA 2346540A CA 2346540 A1 CA2346540 A1 CA 2346540A1
Authority
CA
Canada
Prior art keywords
water
cable according
soluble
solid
polymer 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
CA002346540A
Other languages
French (fr)
Other versions
CA2346540C (en
Inventor
Pietro Anelli
Gianfranco Colombo
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.)
Prysmian Cavi e Sistemi Energia SRL
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2346540A1 publication Critical patent/CA2346540A1/en
Application granted granted Critical
Publication of CA2346540C publication Critical patent/CA2346540C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/443—Protective covering
    • G02B6/4432—Protective covering with fibre reinforcements
    • G02B6/4433—Double reinforcement laying in straight line with optical transmission element
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4429—Means specially adapted for strengthening or protecting the cables
    • G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
    • 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
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/441—Optical cables built up from sub-bundles

Abstract

The present invention relates to a cable, in particular an optical fibre cable, which is resistant to the radial permeation and to the longitudinal propagation of water. This cable comprises a water-soluble polymer material, characterized in that the said material is a water-swellable and water-soluble material. In particular, this cable is characterized in that, following the ingress of water into this cable, the propagation of water is impeded on account of the combined effect of the swelling of the water-soluble material and the formation of an aqueous solution of the said material which has a predetermined viscosity, so as to impede the passage of the residual water.
Preferably, the water-soluble material is chosen from polyacrylamide, modified polyvinyl alcohol, vinyl alcohol/vinyl acetate copolymers, polyvinylpyrrolidone, and mixtures thereof, the material preferably being a vinyl alcohol/vinyl acetate copolymer. The material can advantageously be extruded to form tubular elements for containing optical fibres, for example two-layer tubular elements in which the inner layer is made of water-soluble material and the outer layer is made of a conventional polymer such as PE, PP or PBT.

Claims (29)

1. Optical fibre cable comprising a longitudinal cavity extending along the length of the cable, at least one optical fibre housed inside said longitudinal cavity, and said longitudinal cavity further comprising a solid and compact element within it associated with this cavity, wherein said solid and compact element comprises a water-soluble polymer material which, following accidental ingress of water into the cable, is capable of forming an aqueous solution with a predetermined viscosity such as to block the flow of water within 10 metres of the point of ingress.
2. Cable according to claim 1 wherein said solid and compact element comprises about 30% by weight or more of the said water-soluble polymer material.
3. Cable according to claim 1 wherein said solid and compact element comprises about 50% or more of the said water-soluble polymer material.
4. Cable according to claim 1 wherein said solid and compact element comprises more than about 75% by weight of the said water-soluble polymer material.
5. Cable according to claim 1 wherein said solid and compact element is a structural element of the cable apt to contain and protect the at least one optical fibre disposed within said longitudinal cavity.
6. Cable according to claim 5 wherein said structural element is a tubular element and the said longitudinal cavity is defined by the inner volume of said tubular element.
7. Cable according to claim 6 wherein said tubular element comprises a two-layer wall in which the inner layer is made from the said water-soluble solid material and the outer layer is made from a conventional water-insoluble polymer material.
8. Cable according to claim 7 wherein said tubular element comprises a third outer layer made of water-soluble solid polymer material.
9. Cable according to claim 6 wherein said tubular element is made from a single sheath of said water-soluble solid material.
10. Cable according to claim 5 wherein said structural element apt to contain the at least one optical fibre is a grooved core comprising at least one groove longitudinally disposed on the outer surface of said core and the longitudinal cavity is defined by the inner volume within said groove.
11. Cable according to claim 10 wherein at least the walls of said groove are made from a water-soluble solid polymer material.
12. Cable according to claim 10 wherein said grooved core is made completely from said water-soluble solid polymer material.
13. Cable according to claim 1 wherein the solid and compact element made of water-soluble polymer material is a tape.
14. Optical cable according to claim 1 wherein the water-soluble polymer material has a solubility in water of at least about 100 g/l.
15. Cable according to claim 1 wherein said aqueous solution has a viscosity of at least about 10 4 cP at 20°C.
16. Optical cable according to claim 14 wherein said aqueous solution contains an amount of water-soluble polymer material of from about 100 g/l and about 250 g/l.
17. Optical cable comprising at least one sheath of polymer material arranged so as to form a cavity and at least one solid element of water-soluble polymer material arranged inside this. sheath, characterized in that in the presence of a relative humidity of greater than about 75%
outside this cavity, the relative humidity inside this cavity is maintained below about 75% for a predetermined period of time.
18. Optical cable comprising a cavity and a solid and compact element associated.with this cavity, characterized in that the said solid and compact element comprises a water-soluble polymer material and in that, in the presence of a relative humidity of substantially less than or equal to about 80%, the said water-soluble polymer material absorbs an amount of water of less than about 25% of the amount of water which can be absorbed by the water-soluble solid material under saturation conditions.
19. Cable according to any one of the preceding claims, characterized in that the said water-soluble polymer material is a water-swellable material.
20. Cable according to any one of the preceding claims, in which the said water-soluble material is chosen from polyacrylamide, modified polyvinyl alcohol, vinyl alcohol/vinyl acetate copolymers, polyvinylpyrrolidone, and mixtures thereof.
21. Cable according to Claim 20 wherein the said water-soluble material is a vinyl alcohol/vinyl acetate copolymer which can be obtained by partial hydrolysis of the acetate groups of a polyvinyl acetate homopolymer.
22. Cable according to Claim 21, in which the degree of hydrolysis of the acetate groups of the polyvinyl acetate homopolymer is between about 50% and about 95%.
23. Cable according to Claim 21, characterized in that the said vinyl alcohol/vinyl acetate copolymer has a viscosity index of greater than about 5.
24. Cable according to any one of the preceding claims, characterized in that the said water-soluble polymer material has a breaking load of greater than about 15 Mpa and an elastic modulus of greater than about 200 Mpa.
25. Optical cable according to claim 1 wherein the ratio between the cross section of the said cavity and the perimeter of said water-soluble element in contact with said cavity is less than about 0.5 mm.
26. Cable according to claim 25 wherein, when the water-soluble polymer forms an aqueous solution having a viscosity of at least about 10 4 cP when contacted with water, said ratio is less than about 0.4 mm.
27. Cable according to claim 1, wherein the cross section of the solid element made of water-soluble material is not less than about 10% of the free cross section of the cavity with which the said element is associated.
28. Cable according to claim 1 wherein the cross section of the solid element made of water-soluble material is not less than about 20% of the free cross section of the cavity with which the said element is associated.
29. Cable according to claim 1 wherein the cross section of the solid element made of water-soluble material is not less than about 40% of the free cross section of the cavity with which the said element is associated.
CA002346540A 1998-10-07 1999-10-06 Water-resistant cable Expired - Fee Related CA2346540C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
EP98118900.4 1998-10-07
EP98118900 1998-10-07
US10463798P 1998-10-16 1998-10-16
US60/104,637 1998-10-16
PCT/EP1999/007511 WO2000021098A1 (en) 1998-10-07 1999-10-06 Water-resistant cable

Publications (2)

Publication Number Publication Date
CA2346540A1 true CA2346540A1 (en) 2000-04-13
CA2346540C CA2346540C (en) 2009-12-15

Family

ID=8232754

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002346540A Expired - Fee Related CA2346540C (en) 1998-10-07 1999-10-06 Water-resistant cable

Country Status (13)

Country Link
US (1) US6577796B2 (en)
EP (1) EP1121693B1 (en)
JP (1) JP2003526804A (en)
AR (1) AR023682A1 (en)
AT (1) ATE491212T1 (en)
AU (1) AU763057B2 (en)
BR (1) BR9914277A (en)
CA (1) CA2346540C (en)
DE (1) DE69943025D1 (en)
ES (1) ES2356051T3 (en)
NZ (1) NZ511063A (en)
RU (1) RU2212722C2 (en)
WO (1) WO2000021098A1 (en)

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US7995886B2 (en) * 2004-09-27 2011-08-09 Prysmian Cavi E Sistemi Energia S.R.L. Water-resistant optical cable and manufacturing method
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CN102187260B (en) 2008-08-15 2014-10-29 康宁光缆系统有限公司 Optical fiber assemblies, and methods and apparatus for the manufacture thereof
ES2573329T3 (en) * 2008-12-30 2016-06-07 Draka Comteq B.V. Fiber optic cable comprising a perforated water blocking element
BR122019014137B1 (en) * 2009-05-27 2020-03-03 Prysmian S.P.A. DEFORMATION MONITORING SYSTEMS TO MEASURE AT LEAST TRACTION DEFORMATION AT LEAST ONE ELECTRICAL CABLE AND A PLURALITY OF ELECTRICAL CABLES
JP2011074311A (en) * 2009-10-01 2011-04-14 Hitachi Cable Ltd Ultraviolet-curable resin composition with hydrous water-absorbing polymer dispersed therein, porous material, and insulated electric cable using the porous material
US9042693B2 (en) * 2010-01-20 2015-05-26 Draka Comteq, B.V. Water-soluble water-blocking element
US8682123B2 (en) 2010-07-15 2014-03-25 Draka Comteq, B.V. Adhesively coupled optical fibers and enclosing tape
US8664298B1 (en) * 2010-08-16 2014-03-04 Nei Corporation Self-healing polymer nanocomposite coatings for use on surfaces made of wood
EP2757364B1 (en) * 2013-01-17 2018-12-26 Nexans Use of a polymer mixture as sensing mixture
US9482839B2 (en) 2013-08-09 2016-11-01 Corning Cable Systems Llc Optical fiber cable with anti-split feature
US9547147B2 (en) * 2013-12-20 2017-01-17 Corning Optical Communications LLC Fiber optic cable with extruded tape
US9921380B2 (en) * 2016-03-22 2018-03-20 Ofs Fitel, Llc Composite cable
CN106646797A (en) * 2017-01-17 2017-05-10 烽火通信科技股份有限公司 Water absorption type optical fiber loose tube and manufacturing method thereof
RU189544U1 (en) * 2017-07-25 2019-05-28 Общество с ограниченной ответственностью "ПетроЛайт" Fiber optic cable for monitoring the state of oil and gas wells
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US10593441B1 (en) * 2018-07-13 2020-03-17 Superior Essex International LP Hybrid cable with low density filling compound
CN111487733B (en) * 2020-04-23 2022-03-29 江苏科信光电科技有限公司 Anti-freezing heat-preservation type optical cable in extremely cold weather
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CN115206592B (en) * 2022-07-01 2024-02-09 江苏奥尼特电缆有限公司 Extrusion-preventing type oblate ship cable and processing technology thereof

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Also Published As

Publication number Publication date
BR9914277A (en) 2001-06-19
DE69943025D1 (en) 2011-01-20
US20020041744A1 (en) 2002-04-11
EP1121693A1 (en) 2001-08-08
RU2212722C2 (en) 2003-09-20
EP1121693B1 (en) 2010-12-08
AU6469399A (en) 2000-04-26
CA2346540C (en) 2009-12-15
JP2003526804A (en) 2003-09-09
WO2000021098A1 (en) 2000-04-13
ATE491212T1 (en) 2010-12-15
ES2356051T3 (en) 2011-04-04
AU763057B2 (en) 2003-07-10
AR023682A1 (en) 2002-09-04
US6577796B2 (en) 2003-06-10
NZ511063A (en) 2003-06-30

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