US3646248A - Electric cable - Google Patents

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Publication number
US3646248A
US3646248A US117475A US3646248DA US3646248A US 3646248 A US3646248 A US 3646248A US 117475 A US117475 A US 117475A US 3646248D A US3646248D A US 3646248DA US 3646248 A US3646248 A US 3646248A
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Prior art keywords
cable
curing system
composition
wall
insulation
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US117475A
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Ting H Ling
Marwick H Solomon
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ANACONDA ACQUISITION Co
Ericsson Inc
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Anaconda Wire and Cable Co
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Assigned to ANACONDA-ERICSSON INC., A CORP. OF reassignment ANACONDA-ERICSSON INC., A CORP. OF ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANACONDA COMPANY, THE A CORP. OF DE
Assigned to ANACONDA ACQUISITION CO. reassignment ANACONDA ACQUISITION CO. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ERICSSON, INC., A CORP OF DE
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/20—Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2301/00—Use of unspecified macromolecular compounds as reinforcement
    • B29K2301/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3462—Cables

Definitions

  • One known method of making intimate contact between the insulation surface and the shielding layer is to employ a semiconducting polymeric composition for shielding and to extrude this composition directly over the insulated cable conductor.
  • a disadvantage of known cables, made in this manner resides in the fact that when the insulating and shielding compositions comprise different polymers the walls of insulation and shielding will have different thermal coefficients and, in addition, may require some adhesive interface to assure adequate Contact.
  • the same polymer is used for the insulation and the shielding layer, the latter bonds so firmly to the former that it is difficult and costly to strip the shielding layer at joints and terminations.
  • an electric power cable comprising an elongated conductor and a wall of electrical insulating composition comprising an olefinic terpolymer and a first curing system, surrounding the conductor.
  • a wall of semiconducting composition directly surrounds the wall of insulating composition.
  • This semiconducting composition comprises an olefinic terpolymer and a second curing system for olefinic terpolymers differing essentially from the first curing system.
  • the semiconducting composition is cured by means of this second curing system.
  • the first curing system of my invention may advantageously comprise an organic peroxide such as di-a-cumyl peroxide, and the second curing system may advantageously comprise sulfur.
  • a method of my invention for making an electric power cable I continuously extrude a wall of insulating composition, comprising an olefinic terpolymer and a first curing system over an elongated conductor, and before curing this insulating composition I continuously extrude a wall of semiconducting composition comprising the olefinic terpolymer and a second different curing system over it. Then I continuously heat the Cable so as to cure both the insulating and semiconducting compositions.
  • FIG. 1 shows a cross-sectional view of a cable of my invention.
  • FIG. 2 shows a diagram of the steps of the method of my invention.
  • the cable of my invention indicated generally by the numeral 10
  • a conductor 11 which is conventional and will usually be copper or aluminum and may comprise a plurality of wires, stranded together in a known manner.
  • the conductor is stranded it is known to surround it with a layer 12 of semiconducting strand-shielding composition which, in this application, is considered as being included in the expression conductor.
  • a wall 13 of insulation Surrounding the conductor 11 I have provided a wall 13 of insulation to a thickness detennined by the voltage for which the cable is intended.
  • This insulating wall 13 comprises an olefinic terpolymer such as that sold by E. l. duPont de Nemours and Company under the trademark Nordel.
  • Terpolymers suitable for use in the practice of my invention are described in U.S. Pat. No. 2,933,480 and are characterized by the fact that they can be cured by a sulfur curing system as well as being curable by peroxide.
  • a composition which I prefer for the wall of insulation 13 is given in Example 1.
  • Example 2 Although I prefer the composition of Example 1, I have found that compositions within the ranges shown in Example 2 are particularly advantageous for the wall 13 in the practice of my invention.
  • EXAMPLE 2 Parts by weight Nordel olefinic terpolymer I00 ZnO 2l0 polymerized trirnethyl dihydroquinoline 0.5-3 fine thermal carbon black 2-20 clay filler, silicone treated 50-l50 parafl'rnic oil 5-25 paraffin 2-l0 vinyl silane 0.5-3 red lead 2-l0 di-a-cumyl peroxide 2-5
  • EXAMPLE 3 I Parts by weight Nordel olefinic terpolymer ZnO semiconducting carbon black 50 paraffinic oil (plasticizer) "copper diethyldithiocarbamate 0.75 sulfur (accelerator) 2.5 'n-oxydiethylene benzothizole-2-sulfenamide 2 (accelerator) Vulcan XC-72,Godfrey L. Cabot, lnc.
  • Example 3 Although I prefer the composition of Example 3 for my layer 14 I have found that compositions within the range of Example 4 are particularly useful for the layer 14 in the practice of my invention.
  • EXAMPLE 4 Parts by weight olefinic terpolymer 100 ZnO 3-l5 semiconducting black 30-100 plasticizer 5-20 sulfur l-S accelerators 29
  • a sheet of the composition of Example 1 and a sheet of the composition of Example 3 were pressed together during vulcanization.
  • the bonding force was then determined by measuring the force required to pull apart a 5&- inch strip of the double sheet. This force varied between 3 and 4 pounds. Compared to this, a force in excess of pounds has been required when the same test has been applied to two sheets both employing the same curing system.
  • the cable then passes directly into a continuous vulcanizing tube 19 wherein both the compositions l7 and 18 are cured by the heat and pressure of steam that is supplied through the pipe 21.
  • This improved cable making method and cable has particular application to cables where drain wires are embedded in the semiconducting shield jacket, exemplified by the disclosures of US. Pat. No. 3,474,189.
  • An electric power cable comprising:
  • composition comprising:
  • a first curing system for said terpolymer, said insulating composition being cured by means of said system, and C. a wall of semiconducting composition directly surrounding said wall of insulating composition comprising:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

An electric cable is insulated with a cross-linked olefinic terpolymer and has a semiconducting cross-linked olefinic terpolymer jacket closely applied over the insulation. Different curing systems are employed for the insulation and jacket with the result that the jacket will maintain a void-free contact with the insulation but may still be stripped cleanly from it.

Description

waited States Patent Ling et al.
ELECTRIC CABLE Ting H. Ling; Marwick 1!. Solomon, both of Marion, Ind.
Anaconda Wire and Cable Company Feb. 22,1971 117,475
inventors:
Assignee:
Filed: Appl. No.:
US. Cl ..l74/120 SC, 174/102 SC, 174/105 SC, l17/215 Int. Cl. ..H0lh 7/02 Field of Search ..l74/ l 20 R, 120 SR, 120 SC, 174/120 AR, 102 SC, 110 R, 105 SC, 106 SC;
References Cited UNITED STATES PATENTS Bunish et al "174/120 R X [4 1 Feb. 29, 1972 3,479,446 11/1969 Amaudin etal. ..l74/120R 3,258,522 6/1966 Bartos et a1. ...l74/120 X 3,206,542 9/1965 Dawson et al ....l74/l20 R Primary Examiner-Lewis H. Myers Assistant Examiner-A. T. Grimley Attorney-Victor F. Volk [5 7] ABSTRACT An electric cable is insulated with a cross-linked olefinic terpolymer and has a semiconducting cross-linked olefinic terpolymer jacket closely applied over the insulation. Different curing systems are employed for the insulation and jacket with the result that the jacket will maintain a void-free contact with the insulation but may still be stripped cleanly from it.
7 Claims, 2 Drawing Figures I4-SEMICONDUCTING SULFUR CURED OLEFINIC TERPOLYMER -PEROX|DE CURED OLEFINIC TERPOLYMER INSULATION Patented Feb. 29, 1972 I 3,646,248
l4-SEMICONDUCTING SULFUR CURED OLEFINIC TERPOLYMER -PEROX|DE CURED OLEFINIC TERPOLYMER INSULATION F/'g./
v Y H a Fig.2
INVEN'IOR.
TING H. LING ll/S Mil/l ELECTRIC CABLE BACKGROUND OF THE INVENTION Power cables for operation above about 2,000 volts are required to have an electrical shielding layer surrounding the outer surface of the cable insulation. This layer should be intimately in contact with all points of the entire outer surface of the insulation so that there will, at no time, be any voids or pockets of ionized air or vapor adjacent to the insulation. It is well documented that ionization or corona on an insulation surface will cause deterioration of the dielectric properties of the insulating wall and may eventually lead to cable failure. One known method of making intimate contact between the insulation surface and the shielding layer is to employ a semiconducting polymeric composition for shielding and to extrude this composition directly over the insulated cable conductor. A disadvantage of known cables, made in this manner, resides in the fact that when the insulating and shielding compositions comprise different polymers the walls of insulation and shielding will have different thermal coefficients and, in addition, may require some adhesive interface to assure adequate Contact. When, on the other hand, the same polymer is used for the insulation and the shielding layer, the latter bonds so firmly to the former that it is difficult and costly to strip the shielding layer at joints and terminations.
SUMMARY I have overcome the deficiencies of known cables by the invention of an electric power cable comprising an elongated conductor and a wall of electrical insulating composition comprising an olefinic terpolymer and a first curing system, surrounding the conductor. A wall of semiconducting composition directly surrounds the wall of insulating composition. This semiconducting composition comprises an olefinic terpolymer and a second curing system for olefinic terpolymers differing essentially from the first curing system. The semiconducting composition is cured by means of this second curing system. The first curing system of my invention may advantageously comprise an organic peroxide such as di-a-cumyl peroxide, and the second curing system may advantageously comprise sulfur.
In a method of my invention for making an electric power cable I continuously extrude a wall of insulating composition, comprising an olefinic terpolymer and a first curing system over an elongated conductor, and before curing this insulating composition I continuously extrude a wall of semiconducting composition comprising the olefinic terpolymer and a second different curing system over it. Then I continuously heat the Cable so as to cure both the insulating and semiconducting compositions.
l have found that by the use of olefinic terpolymer compositions for both the insulation and shielding jacket of my cable I can realize the good electrical and water resistant properties of the terpolymer for an insulation and its excellent abrasion resistance and toughness for a jacket which combines on a shield. At the same time the interface between the insulation and shield is sufficiently intimate, because the surfaces are so essentially compatible. Furthermore, there is no separation due to thermal effects during the life of the cable. At the same time, since I have applied different curing systems to each layer, the shielding layer does not bond so firmly to the insulation as to create difficulties in stripping. Particularly my present cable can have the semiconducting jacket stripped from the insulation without, as frequently occurred with prior art cables, tearing any of the insulation from the outer insulation surface.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 shows a cross-sectional view of a cable of my invention.
FIG. 2 shows a diagram of the steps of the method of my invention.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Referring to FIG. 1 the cable of my invention, indicated generally by the numeral 10, comprises a conductor 11 which is conventional and will usually be copper or aluminum and may comprise a plurality of wires, stranded together in a known manner. Particularly where the conductor is stranded it is known to surround it with a layer 12 of semiconducting strand-shielding composition which, in this application, is considered as being included in the expression conductor.
Surrounding the conductor 11 I have provided a wall 13 of insulation to a thickness detennined by the voltage for which the cable is intended. This insulating wall 13 comprises an olefinic terpolymer such as that sold by E. l. duPont de Nemours and Company under the trademark Nordel. Terpolymers suitable for use in the practice of my invention are described in U.S. Pat. No. 2,933,480 and are characterized by the fact that they can be cured by a sulfur curing system as well as being curable by peroxide. A composition which I prefer for the wall of insulation 13 is given in Example 1.
EXAMPLE 1.
Parts by weight Nnrdel olefinic terpolymer I00 ZnO 5 polymerized trimethyldihydroquinoline l.5 fine thermal carbon black l0 "clay filler, silicone treated I I0 paraffinic oil l5 paraffin S vinyl silane 1 red lead 5 diu-cumyl peroxide 3.5
Age-Rite Resin D, R. l. Vanderbilt Co. Inc.
"described in U.S. Pat. No. 3,l48,l69
A-l72 Silane, Union Carbide Corp.
Although I prefer the composition of Example 1, I have found that compositions within the ranges shown in Example 2 are particularly advantageous for the wall 13 in the practice of my invention.
EXAMPLE 2 Parts by weight Nordel olefinic terpolymer I00 ZnO 2l0 polymerized trirnethyl dihydroquinoline 0.5-3 fine thermal carbon black 2-20 clay filler, silicone treated 50-l50 parafl'rnic oil 5-25 paraffin 2-l0 vinyl silane 0.5-3 red lead 2-l0 di-a-cumyl peroxide 2-5 EXAMPLE 3 I Parts by weight Nordel olefinic terpolymer ZnO semiconducting carbon black 50 paraffinic oil (plasticizer) "copper diethyldithiocarbamate 0.75 sulfur (accelerator) 2.5 'n-oxydiethylene benzothizole-2-sulfenamide 2 (accelerator) Vulcan XC-72,Godfrey L. Cabot, lnc.
Cumate R. T. Vanderbilt Co.
'"NOBS special accelerator, American Cyanamide Co.
Although I prefer the composition of Example 3 for my layer 14 I have found that compositions within the range of Example 4 are particularly useful for the layer 14 in the practice of my invention.
EXAMPLE 4 Parts by weight olefinic terpolymer 100 ZnO 3-l5 semiconducting black 30-100 plasticizer 5-20 sulfur l-S accelerators 29 To test the stripability of the insulation-shielding combinations of my invention a sheet of the composition of Example 1 and a sheet of the composition of Example 3 were pressed together during vulcanization. The bonding force was then determined by measuring the force required to pull apart a 5&- inch strip of the double sheet. This force varied between 3 and 4 pounds. Compared to this, a force in excess of pounds has been required when the same test has been applied to two sheets both employing the same curing system.
The advantages of my invention are most greatly realized in a method of manufacture of my cable where the shielding is extruded over the insulation without intermediate curing, because the likelihood of excessive bonding of prior art cables would be the greatest under these circumstances. This method is shown diagrammatically in FIG. 2. Here the conductor 11 is being continuously paid from a source, not shown, into a dual extrusion head 16 wherein a stock 17 of a composition of Example 2 is being extruded to form the wall of insulation-13 and a stock 18 of a composition of Example 4 is being extruded directly over the insulation to fonn the shielding jacket l4.
The cable then passes directly into a continuous vulcanizing tube 19 wherein both the compositions l7 and 18 are cured by the heat and pressure of steam that is supplied through the pipe 21. This improved cable making method and cable has particular application to cables where drain wires are embedded in the semiconducting shield jacket, exemplified by the disclosures of US. Pat. No. 3,474,189.
I have made a new and useful invention of which the foregoing description has been exemplary rather than definitive and for which I desire an award of Letters Patent as defined in the following claims.
We claim:
1. An electric power cable comprising:
A. an elongated conductor,
B. a wall of electrical insulating composition surrounding said conductor, said composition comprising:
1. an olefinic terpolymer, and
2. a first curing system for said terpolymer, said insulating composition being cured by means of said system, and C. a wall of semiconducting composition directly surrounding said wall of insulating composition comprising:
1. an olefinic terpolymer and 2. a second curing system for olefinic terpolymers differing essentially from said first curing system, said semiconducting composition being cured by means of said second system. I 2. The cable of claim 1 wherein said first curing system comprises an organic peroxide.
3. The cable of claim 1 wherein said first curing system comprises di-a-cumyl peroxide.
4. The cable of claim 1 wherein said second curing system comprises sulfur.
5. The cable of claim 2 wherein said second curing system comprises sulfur.
6. The cable of claim 3 wherein said second curing system comprises sulfur.
7. The method of making an electric power cable comprising the steps of:
A. continuously extruding a wall of insulating composition, comprising an olefinic terpolymer and a first curing system, over an elongated conductor,
B. before curing said insulating composition continuously extruding a wall of semiconducting composition comprising an olefinic terpolymer and a second different curing system directly over said insulating wall, and
C. continuously heating said cable so as to cure said insulating and said semiconducting compositions.

Claims (8)

  1. 2. a first curing system for said terpolymer, said insulating composition being cured by means of said system, and C. a wall of semiconducting composition directly surrounding said wall of insulating composition comprising:
  2. 2. a second curing system for olefinic terpolymers differing essentially from said first curing system, said semiconducting composition being cured by means of said second system.
  3. 2. The cable of claim 1 wherein said first curing system comprises an organic peroxide.
  4. 3. The cable of claim 1 wherein said first curing system compRises di- Alpha -cumyl peroxide.
  5. 4. The cable of claim 1 wherein said second curing system comprises sulfur.
  6. 5. The cable of claim 2 wherein said second curing system comprises sulfur.
  7. 6. The cable of claim 3 wherein said second curing system comprises sulfur.
  8. 7. The method of making an electric power cable comprising the steps of: A. continuously extruding a wall of insulating composition, comprising an olefinic terpolymer and a first curing system, over an elongated conductor, B. before curing said insulating composition continuously extruding a wall of semiconducting composition comprising an olefinic terpolymer and a second different curing system directly over said insulating wall, and C. continuously heating said cable so as to cure said insulating and said semiconducting compositions.
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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705257A (en) * 1972-03-06 1972-12-05 Anaconda Wire & Cable Co Electric cable and method of making
US3787255A (en) * 1972-05-30 1974-01-22 Essex International Inc Insulated cable with sheath of controlled peel strength and method
US3793476A (en) * 1973-02-26 1974-02-19 Gen Electric Insulated conductor with a strippable layer
JPS49135185A (en) * 1973-04-30 1974-12-26
US3876462A (en) * 1972-05-30 1975-04-08 Essex International Inc Insulated cable with layer of controlled peel strength
US3878319A (en) * 1974-07-08 1975-04-15 Gen Electric Corona-resistant ethylene-propylene rubber insulated power cable
US3909507A (en) * 1973-12-06 1975-09-30 Gen Electric Electrical conductors with strippable polymeric materials
US3976563A (en) * 1975-03-07 1976-08-24 Bell Telephone Laboratories, Incorporated Dry reclamation of wire scrap
US4075421A (en) * 1975-12-23 1978-02-21 General Electric Company Direct current cable with resistivity graded insulation, and a method of transmitting direct current electrical energy
FR2419155A1 (en) * 1978-03-07 1979-10-05 Asea Ab DEVICE FOR THE MANUFACTURE OF MOLDED PRODUCTS BY EXTRUSION
US4234624A (en) * 1978-03-07 1980-11-18 Asea Aktiebolag Method of applying an insulation of cross-linked polymer on a cable conductor
US5231249A (en) * 1990-02-23 1993-07-27 The Furukawa Electric Co., Ltd. Insulated power cable
US20170250008A1 (en) * 2014-10-17 2017-08-31 3M Innovative Properties Company Dielectric material with enhanced breakdown strength
US20190239398A1 (en) * 2016-07-19 2019-08-01 Autonetworks Technologies, Ltd. Shield member, shield member-attached electric wire, intermediate product for shield member, and method for producing shield member

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206542A (en) * 1961-11-17 1965-09-14 Ass Elect Ind Composite dielectric material for wires and cables
US3258522A (en) * 1963-10-04 1966-06-28 Dow Corning Insulating cable splices
US3479446A (en) * 1968-06-27 1969-11-18 Anaconda Wire & Cable Co Strand shielded cable and method of making
US3571490A (en) * 1970-01-16 1971-03-16 Anaconda Wire & Cable Co Flame resistant electric cable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3206542A (en) * 1961-11-17 1965-09-14 Ass Elect Ind Composite dielectric material for wires and cables
US3258522A (en) * 1963-10-04 1966-06-28 Dow Corning Insulating cable splices
US3479446A (en) * 1968-06-27 1969-11-18 Anaconda Wire & Cable Co Strand shielded cable and method of making
US3571490A (en) * 1970-01-16 1971-03-16 Anaconda Wire & Cable Co Flame resistant electric cable

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3705257A (en) * 1972-03-06 1972-12-05 Anaconda Wire & Cable Co Electric cable and method of making
US3787255A (en) * 1972-05-30 1974-01-22 Essex International Inc Insulated cable with sheath of controlled peel strength and method
US3876462A (en) * 1972-05-30 1975-04-08 Essex International Inc Insulated cable with layer of controlled peel strength
US3793476A (en) * 1973-02-26 1974-02-19 Gen Electric Insulated conductor with a strippable layer
JPS49135185A (en) * 1973-04-30 1974-12-26
US3909507A (en) * 1973-12-06 1975-09-30 Gen Electric Electrical conductors with strippable polymeric materials
US3878319A (en) * 1974-07-08 1975-04-15 Gen Electric Corona-resistant ethylene-propylene rubber insulated power cable
US3976563A (en) * 1975-03-07 1976-08-24 Bell Telephone Laboratories, Incorporated Dry reclamation of wire scrap
US4075421A (en) * 1975-12-23 1978-02-21 General Electric Company Direct current cable with resistivity graded insulation, and a method of transmitting direct current electrical energy
FR2419155A1 (en) * 1978-03-07 1979-10-05 Asea Ab DEVICE FOR THE MANUFACTURE OF MOLDED PRODUCTS BY EXTRUSION
US4234624A (en) * 1978-03-07 1980-11-18 Asea Aktiebolag Method of applying an insulation of cross-linked polymer on a cable conductor
US5231249A (en) * 1990-02-23 1993-07-27 The Furukawa Electric Co., Ltd. Insulated power cable
US20170250008A1 (en) * 2014-10-17 2017-08-31 3M Innovative Properties Company Dielectric material with enhanced breakdown strength
US10121570B2 (en) * 2014-10-17 2018-11-06 3M Innovative Properties Company Dielectric material with enhanced breakdown strength
US20190239398A1 (en) * 2016-07-19 2019-08-01 Autonetworks Technologies, Ltd. Shield member, shield member-attached electric wire, intermediate product for shield member, and method for producing shield member
US11006555B2 (en) * 2016-07-19 2021-05-11 Autonetworks Technologies, Ltd. Shield member, shield member-attached electric wire, intermediate product for shield member, and method for producing shield member

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