US3790694A - Filled telephone cable with bonded screening layer - Google Patents

Filled telephone cable with bonded screening layer Download PDF

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Publication number
US3790694A
US3790694A US00363060A US3790694DA US3790694A US 3790694 A US3790694 A US 3790694A US 00363060 A US00363060 A US 00363060A US 3790694D A US3790694D A US 3790694DA US 3790694 A US3790694 A US 3790694A
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US
United States
Prior art keywords
tape
layer
cable
telephone cable
set forth
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.)
Expired - Lifetime
Application number
US00363060A
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English (en)
Inventor
A Portinari
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.)
Pirelli and C SpA
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Pirelli SpA
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.)
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Publication of US3790694A publication Critical patent/US3790694A/en
Assigned to SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY reassignment SOCIETA' PIRELLI S.P.A., A COMPANY OF ITALY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INDUSTRIE PIRELLI S.P.A.
Anticipated expiration legal-status Critical
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
    • 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
    • H01B11/02—Cables with twisted pairs or quads
    • H01B11/06—Cables with twisted pairs or quads with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
    • 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
    • H01B7/0208—Cables with several layers of insulating material
    • H01B7/0216—Two layers

Definitions

  • ABSTRACT A fully-filled telephone cable having a central core of insulated wires bunched together and held together by a layer of an insulating tape, both the spaces between the wires and the tape being filled with a solid or semisolid gel derived from a paraffin, Vaseline or mineral oil.
  • the layer of tape is surrounded by a helically wrapped or longitudinally extending composite tape having an inner layer of paper filled by said gel and having an outer layer of a thermoplastic material.
  • the layer of composite tape is surrounded by a helically wrapped or longitudinally extending screen comprising a metal tape coated on its inner and outer surfaces with a thermoplastic material, the inner surface coating being bonded to the outer layer of the composite tape by fusion.
  • the screen is surrounded by a sheath of thermoplastic material having its inner surface bonded by fusion to the outer surface coating of the metal tape.
  • the present invention relates to an improvement in a telephone cable of the type known to those skilled in the art as a fully-filled cable.
  • a fully-filled cable provides a reliable tightness with respect to the longitudinal migration of water which may penetrate into the inside of the cable as a result of a failure of the sheath to prevent the entrance of moisture.
  • Said tightness is obtained by filling the empty spaces between the elements of the group of conductors, or cord, with a filling material which usually is a solid or semi-solid gel derived from mineral oil.
  • cor means the bunch or group of conductors obtained by bunching together individual conductors, appropriately insulated, or by bunching together pairs, quads, etc., constituted by the stranding of individually insulated wires.
  • the cord is generally wrapped with tapes impregnated with filling material, and is covered with an outer sheath of extruded thermoplastic material.
  • the sheath after the extrusion and during the cooling process, shrinks, which reduces the diameter of its cross section, exerting in this way on the underlying filled and wrapped cord a contracting action which ensires tightness against the longitudinal propagation of water between the sheath and the cord.
  • the screen is in the form of a longitudinal tape.
  • the latter is generally a smooth tape, coated on its outer surface with a thermoplastic material the same as that of the outer thermoplastic sheath and adhering to the tape.
  • the term outer will indicate the elements more remote from the cable axis, and inner, the elements nearer said axis.
  • thermoplastic coating of the screen melts, bonding said screen, by means of the coating thereon, to the outer thermoplastic sheath being formed.
  • the present invention aims at eliminating the hereinbefore indicated problems by providing an improved fully-filled telephone cable in which any infiltration of water, in particular between the metallic screen and the cord, is prevented.
  • one object of the present invention is an improved telephone cable of the fully-filled type, which comprises a cord and a first wrapping of insulating material, both dipped in, or impregnated with, filling material, a screen constituted by a metallic tape having its outer surface coated with thermoplastic material, and an outer thermoplastic sheath, the material coating the outer surface of the screen being bonded by fusion with the material of the outer sheath during the extrusion of said sheath, chacterized in that a second wrapping, consitituted by a composite tape made of two layers is included between said metallic screen and said first wrapping.
  • the composite tape comprises an inner layer which can be impregnated with said filling material and an outer layer of thermoplastic material which can be bonded by fusion to a coating of thermoplastic material provided on the inner surface of said metallic screen.
  • FIGURE of the attached sheet of drawing illustrates in perspective, and partially cut away, a preferred embodiment of the improved fully-filled cable of the invention.
  • the illustrated fully-filled telephone cable comprises a cord 1 of a plurality of insulated wires covered with a first helical wrapping constituted by a tape 2 of insulating material.
  • the tape 2 is preferably made of paper or of thermoplastic material. In the drawing, the thickness of the tape 2 wrapping the cord 1 is purposely exaggerated for illustration purposes.
  • the cord 1 and the tape 2 are dipped in, or impregnated with, a filling material, preferably a gel in solid or semi-solid state and derived from mineral oil, for instance, a paraffin or vaseline.
  • a filling material preferably a gel in solid or semi-solid state and derived from mineral oil, for instance, a paraffin or vaseline.
  • a second helical wrapping of a composite tape 3 constituted by two layers 3' and 3" is wound around the tape 2.
  • the inner layer 3 of the tape 3, directed towards the tape 2, is made of a material which can be impregnated with the filling mateial, for example, paper.
  • the outer layer 3" is made of thermoplastic material which, preferably, is bonded to the inner layer 3 such as by a suitable adhesive or by reason of the nature of the material used for the layer 3" or by any other known means.
  • the tape 3 could be wrapped longitudinally around the layer of tape 2 with overlapped edges and with the overlapped edges thereof on top of the first helical wrapping 2.
  • the overlapping edges of the composite tape 3 preferably are diametrically opposite to the position of the longitudinal edges of the metallic screen, which, preferably, also is longitudinally wound.
  • a screen 4 in the form of a metallic tape for example, an aluminum tape, is wrapped longitudinally.
  • a screen formed by a helically wound tape can also be used.
  • the screen 4 is coated with thermoplastic material on both of its surfaces, the coatings preferably being bonded thereto either by an adhesive or by reason of the nature of the material used for the layers 4' and 4".
  • the coating 4 can be bonded, such as by fusion, to the outer layer 3" of the composite tape 3, and preferably it is made of the same material constituting said outer layer 3" of the tape 3, such as, for example, polyethylene, polypropylene, ethylenepropylene copolymers or polyvinylchloride.
  • said coating 4" is made of a thermoplastic material capable of being bonded, such as by fusion, to the sheath 5.
  • the material of the coating 4" is the same as that of the outer thermoplastic sheath 5, e.g., polyethylene, polypropylene, ethylene-propylene copolymers or polyvinylchloride.
  • thermoplastic sheath 5 by extrusion generates heat, and this gives rise to the bonding by melting of the outer layer 3" of the composite tape 3 to the inner coating 4' of the screen 4.
  • the bonding of the tape 3 to the screen 4 can also be carried out by means of a heat treatment separate from that produced by the extrusion of the thermoplastic sheath 5.
  • a fully-filled telephone cable comprising a plurality of central conductors grouped together to form a cord, a layer of insulating material surrounding said cord, a filling material filling the spaces between said conductors, said layer of insulating material also being impregnated with said filling material, a sheath of thermoplastic material surrounding but spaced from said layer, a composite tape surrounding said layer and intermediate said layer and said sheath, said tape comprising an inner layer of insulation impregnated with said filling material and an outer layer of thermoplastic material, a screen surrounding said tape and intermediate said tape and said sheath, said screen comprising a metal tape having a coating of thermoplastic material on the inner surface thereof which is bonded to said outer layer of said composite tape and having a coating of thermoplastic material on the outer surface thereof which is bonded to the inner surface of said sheath.
  • thermoplastic materials is a thermoplastic material selected from the group consisting of polyethylene, polypropylene, ethylene-propylene copolymers and polyvinylchloride.
  • thermoplastic material forms at least one of said outer layer and said coating on said inner surface of said metal tape.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Ropes Or Cables (AREA)
  • Insulated Conductors (AREA)
US00363060A 1972-06-07 1973-05-23 Filled telephone cable with bonded screening layer Expired - Lifetime US3790694A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT25330/72A IT956327B (it) 1972-06-07 1972-06-07 Cavo telefonico tamponato perfezionato

Publications (1)

Publication Number Publication Date
US3790694A true US3790694A (en) 1974-02-05

Family

ID=11216358

Family Applications (1)

Application Number Title Priority Date Filing Date
US00363060A Expired - Lifetime US3790694A (en) 1972-06-07 1973-05-23 Filled telephone cable with bonded screening layer

Country Status (11)

Country Link
US (1) US3790694A (it)
AR (1) AR196670A1 (it)
AU (1) AU469704B2 (it)
BR (1) BR7303475D0 (it)
CA (1) CA993067A (it)
FR (1) FR2188264B1 (it)
GB (1) GB1388974A (it)
IN (1) IN139144B (it)
IT (1) IT956327B (it)
SE (1) SE392984B (it)
ZA (1) ZA733808B (it)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010315A (en) * 1975-04-25 1977-03-01 The Dow Chemical Company Shielding tape for cables
US4109099A (en) * 1976-02-05 1978-08-22 Western Electric Company, Incorporated Dual jacketed cable
US4292463A (en) * 1977-12-14 1981-09-29 The Dow Chemical Company Cable shielding tape and cable
US4322574A (en) * 1979-09-17 1982-03-30 The Dow Chemical Co. Cable shielding tape and cable
US4402789A (en) * 1981-09-18 1983-09-06 Northern Telecom Limited Method of coating an insulated electrical conductor
US4454379A (en) * 1982-05-21 1984-06-12 General Electric Company Semi-conductive, moisture barrier shielding tape and cable
US4456785A (en) * 1982-09-17 1984-06-26 Gulf & Western Manufacturing Company Shielded cable and method of manufacture thereof
US4647720A (en) * 1982-08-10 1987-03-03 Canada Wire And Cable Limited Cable having composite shield and armour sheath design
US4870226A (en) * 1987-03-23 1989-09-26 N.K.F.Kabel B.V. Multi-conductor high voltage cable, in particular three-conductor cable
US5105057A (en) * 1991-05-20 1992-04-14 Weinberg Martin J Insulated magnet wire and method of forming the same
US5249248A (en) * 1991-11-27 1993-09-28 At&T Bell Laboratories Communication cable having a core wrap binder which provides water-blocking and strength properties
US5325457A (en) * 1991-09-20 1994-06-28 Bottoms Jack Jr Field protected self-supporting fiber optic cable
US5380591A (en) * 1992-12-30 1995-01-10 Union Carbide Chemicals & Plastics Technology Corporation Telephone cables
US5414215A (en) * 1992-01-28 1995-05-09 Filotex High frequency electric cable
US5457287A (en) * 1993-05-20 1995-10-10 Junkosha Co., Ltd. Coaxial electrical cable
US20140366368A1 (en) * 2003-12-11 2014-12-18 Fermin Marquez Arzate Method for manufacturing an improved overhead and underground cable lead-in cable for voice,data and video transmission services
US9117566B2 (en) 2013-03-14 2015-08-25 Teledyne Instruments, Inc. Impedance controlled subsea ethernet oil filled hose

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1079512A (en) 1978-11-16 1980-06-17 Basil V.E. Walton Powdered telephone cable filling compound
WO1993024938A1 (en) * 1992-05-26 1993-12-09 Union Carbide Chemicals & Plastics Technology Corporation Telephone cables
WO1993024935A1 (en) * 1992-05-26 1993-12-09 Union Carbide Chemicals & Plastics Technology Corporation Telephone cables
US6120897A (en) * 1993-04-15 2000-09-19 Union Carbide Chemicals & Plastics Technology Corporation Telephone cables

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3321572A (en) * 1965-09-13 1967-05-23 Gen Cable Corp Dual laminated telephone cable sheath
US3332138A (en) * 1965-08-11 1967-07-25 Gen Cable Corp Method and apparatus for making precision sized tubing
US3607487A (en) * 1968-12-02 1971-09-21 Bell Telephone Labor Inc Waterproof electrical cable
US3614299A (en) * 1970-07-17 1971-10-19 Exxon Research Engineering Co Low thermal conductivity cable core wrap
US3622683A (en) * 1968-11-22 1971-11-23 Superior Continental Corp Telephone cable with improved crosstalk properties
US3681515A (en) * 1971-04-29 1972-08-01 Dow Chemical Co Electric cables and like conductors
US3706838A (en) * 1969-11-19 1972-12-19 British Insulated Callenders Telecommunication cables
US3733225A (en) * 1970-09-04 1973-05-15 Western Electric Co Method of applying a waterproofing jelly-like compound to an elongated strand and forming a sheath about the strand

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3332138A (en) * 1965-08-11 1967-07-25 Gen Cable Corp Method and apparatus for making precision sized tubing
US3321572A (en) * 1965-09-13 1967-05-23 Gen Cable Corp Dual laminated telephone cable sheath
US3622683A (en) * 1968-11-22 1971-11-23 Superior Continental Corp Telephone cable with improved crosstalk properties
US3607487A (en) * 1968-12-02 1971-09-21 Bell Telephone Labor Inc Waterproof electrical cable
US3706838A (en) * 1969-11-19 1972-12-19 British Insulated Callenders Telecommunication cables
US3614299A (en) * 1970-07-17 1971-10-19 Exxon Research Engineering Co Low thermal conductivity cable core wrap
US3733225A (en) * 1970-09-04 1973-05-15 Western Electric Co Method of applying a waterproofing jelly-like compound to an elongated strand and forming a sheath about the strand
US3681515A (en) * 1971-04-29 1972-08-01 Dow Chemical Co Electric cables and like conductors

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4010315A (en) * 1975-04-25 1977-03-01 The Dow Chemical Company Shielding tape for cables
US4109099A (en) * 1976-02-05 1978-08-22 Western Electric Company, Incorporated Dual jacketed cable
US4134953A (en) * 1976-02-05 1979-01-16 Western Electric Company, Incorporated Methods of making dual jacketed cable
US4292463A (en) * 1977-12-14 1981-09-29 The Dow Chemical Company Cable shielding tape and cable
US4322574A (en) * 1979-09-17 1982-03-30 The Dow Chemical Co. Cable shielding tape and cable
US4402789A (en) * 1981-09-18 1983-09-06 Northern Telecom Limited Method of coating an insulated electrical conductor
US4454379A (en) * 1982-05-21 1984-06-12 General Electric Company Semi-conductive, moisture barrier shielding tape and cable
US4647720A (en) * 1982-08-10 1987-03-03 Canada Wire And Cable Limited Cable having composite shield and armour sheath design
US4456785A (en) * 1982-09-17 1984-06-26 Gulf & Western Manufacturing Company Shielded cable and method of manufacture thereof
US4870226A (en) * 1987-03-23 1989-09-26 N.K.F.Kabel B.V. Multi-conductor high voltage cable, in particular three-conductor cable
US5105057A (en) * 1991-05-20 1992-04-14 Weinberg Martin J Insulated magnet wire and method of forming the same
US5325457A (en) * 1991-09-20 1994-06-28 Bottoms Jack Jr Field protected self-supporting fiber optic cable
US5249248A (en) * 1991-11-27 1993-09-28 At&T Bell Laboratories Communication cable having a core wrap binder which provides water-blocking and strength properties
US5414215A (en) * 1992-01-28 1995-05-09 Filotex High frequency electric cable
US5380591A (en) * 1992-12-30 1995-01-10 Union Carbide Chemicals & Plastics Technology Corporation Telephone cables
US5457287A (en) * 1993-05-20 1995-10-10 Junkosha Co., Ltd. Coaxial electrical cable
US20140366368A1 (en) * 2003-12-11 2014-12-18 Fermin Marquez Arzate Method for manufacturing an improved overhead and underground cable lead-in cable for voice,data and video transmission services
US9583236B2 (en) * 2003-12-11 2017-02-28 Servicios Condumex Method for manufacturing an improved overhead and underground cable lead-in cable for voice, data and video transmission services
US9117566B2 (en) 2013-03-14 2015-08-25 Teledyne Instruments, Inc. Impedance controlled subsea ethernet oil filled hose

Also Published As

Publication number Publication date
GB1388974A (en) 1975-04-03
FR2188264B1 (it) 1977-04-29
IT956327B (it) 1973-10-10
CA993067A (en) 1976-07-13
AU469704B2 (en) 1976-02-19
ZA733808B (en) 1974-04-24
SE392984B (sv) 1977-04-25
BR7303475D0 (pt) 1974-07-11
AR196670A1 (es) 1974-02-12
IN139144B (it) 1976-05-15
AU5656773A (en) 1974-12-12
FR2188264A1 (it) 1974-01-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SOCIETA PIRELLI S.P.A., PIAZZALE CADORNA 5, 20123

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INDUSTRIE PIRELLI S.P.A.;REEL/FRAME:003847/0084

Effective date: 19810101