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US3701840A - Embossed core wrap for electrical cables - Google Patents

Embossed core wrap for electrical cables Download PDF

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Publication number
US3701840A
US3701840A US142211A US3701840DA US3701840A US 3701840 A US3701840 A US 3701840A US 142211 A US142211 A US 142211A US 3701840D A US3701840D A US 3701840DA US 3701840 A US3701840 A US 3701840A
Authority
US
United States
Prior art keywords
embossments
core
cable
polymeric film
conductor core
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
US142211A
Other languages
English (en)
Inventor
Charles R Willmore
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.)
FMC Corp
Original Assignee
FMC Corp
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 FMC Corp filed Critical FMC Corp
Application granted granted Critical
Publication of US3701840A publication Critical patent/US3701840A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
    • 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
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/189—Radial force absorbing layers providing a cushioning effect
    • 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
    • H01B7/29—Protection against damage caused by extremes of temperature or by flame
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24628—Nonplanar uniform thickness material
    • Y10T428/24669—Aligned or parallel nonplanarities
    • Y10T428/24678—Waffle-form

Definitions

  • the present invention is directed to anelectrical cable having an improved protective barrier for the cable is formed of single thickness (non-laminated) polyester film, with the corrugations thereof being uniform and extending longitudinally thereof, and may be either wound spirally about the conductor core or applied longitudinally thereto with their longitudinal edges overlapped.
  • the corrugated tape provides air spaces in the area between the conductor core and the surrounding metallic shield which serve to insulate the core against the transfer of heat applied to the metalliclshield during jacketing of the cable with the molten thermoplastic material. These air spaces alsopneumatically cushion the conductor core against mechanical forces applied to the cable and which might otherwise damage the core insulation.
  • polyester film is well suited for use as a protective barrier in electrical cables since such film does not absorb moisture, has a low dielectric constant, low dissipation factor i and high dielectric strength, and retains these desirable characteristics during the operating life of electrical cables.
  • the longitudinally extending corrugations do enhance certain of the characteristics. which the polyester film itself possesses.
  • the presence of these longitudinally extending corrugations do not remedy and may perhaps introduce or amplify problems which are commonly encountered in making of electrical cables having an electrical insulating jell contained between the wires of the conductor core and barrier tape.
  • wires which are to form the cable core are coated with a relatively heavy layer of an electrically insulating jell which may be, for example, a blend of petrolatum and polyethylene.
  • an electrically insulating jell which may be, for example, a blend of petrolatum and polyethylene.
  • this coating operation is achieved by passing the core wires through a bath of molten jell. Once coated, the wires are squeezed tightly together, wrapped with a barrier tape, and covered with a metallic sheath and a jacket of thermoplastic material. Squeezing of the coated core wires together, prior to the application of the barrier tape, serves to remove excess jell and causes all voids about the core wires to be filled. With the removal of such voids all air is excluded from the core jell covering and the possibility of moisture entering into such core, in the event the jacket is subsequently damaged, is eliminated.
  • a primary object of this invention is to provide an improved protective barrier for a cond uctor 'core of an electrical cable.
  • Another object of this invention is the provision of an electrical cable having a conductor core surrounded with a protective barrier formed of embossed polymeric film, and particularly polyethylene terephthalate film, which affords mechanical protection, thermal in- I sulation, dielectric protection, and electrical stability for such core.
  • Still another object of the present invention is to provide a protective barrier which is adapted to form an essentially liquid-tight seal about a conductor core of an electrical cable.
  • a further object is to provide an electrical cable having an electrical insulating jell contained between a conductor core and a protective barrier formed with closely packed embossments which obstruct or retard jell flow.
  • a still further object is to provide, for use in electrical cables, a protective barrier having embossments which are. adapted to interlock with each other when overlapped and thereby form an essentially fluid-tight joint therebetween.
  • an embossed polymeric film as a protective barrier between a conductor core and an outer protective coveringof an electrical cable.
  • This protective barrier is preferably formed of polyethylene terephthalate film and is hereafter described as such.
  • films formed of other polymeric materials may be employed, providing such films do not absorb moisture, have a low dielectric constant, low dissipation factor, high dielectric strength and are capable of being embossed and permanently retaining such embossments.
  • the embossed polyester film forming the protective barrier of the present invention is applied as a tape or strip, either longitudinally or spirally about the conductor core, with its longitudinal edges in overlapping relationship. Once applied, the embossments on such tape form air spaces between the conductor core and an overlying metallic sheath which, together with a jacket of thermoplastic material, constitutes the protective outer covering of the cable. These contained air spaces serve as a thermal insulation and pneumatically cushion the conductor core from external forces.
  • the polyester film and embossments thereon together provide mechanical protection, thermal insulation, dielectric protection and electrical stability for the conductor core which is many times greater than that which is afforded by a flat polyester film of like thickness.
  • the embossments on the tape of polyester film serve also to restrict or retard the flow of the jell along the conductor core. More important, overlapping edge portions of such embossed tape, whether applied longitudinally or spirally of the conductor core, interlock with each other. That is, embossments projecting from the surface of one of such overlapping edge portions mate and grip firmly with depreswith each other.
  • the embossments are aligned in substantially parallel rows, with the em bossments in each of such'rows being in staggered relationship with the embossments in the rows directly adjacent thereto whereby only circuitous flow paths are present along opposite sides of such-film.
  • the embossments are arranged in almost abutting relationship.
  • the perimeters of the embossments may be circular or may be defined by straight and/or arcuate lines.
  • the perimeters of the embossments are of polygonal contour, as for example of hexagonal configuration, to facilitate a close-packed staggered arrangement thereof, and are separated from each other only by linear portions of the film.
  • the embossed polyester film of the present invention affords the above-described advantages regardless of whether its embossed or recessed side is in facing relationship with theconductor core.
  • FIG. 1 is a side view of an electrical cable which incorporates the protective barrier of the present invention, with portions of such cable being broken away to illustrate various elements thereof;
  • FIG. 2 is a transverse section through the electrical cable taken substantially along the line lI-Il of FIG. 1;
  • FIG. 3 is a plan view of a portion of the protective barrier employed in the cable shown in FIG. 1;
  • FIG. 4 is a vertical section taken substantially along the line IV-IV of FIG. 3;
  • FIG. 5 is a vertical section taken substantially along the line V-V of FIG. 3, and
  • FIG. 6 is a section, similar to that shown in FIG. 3, taken through overlapping edge portions of the protective barrier.
  • the electrical cable there illustrated is indicated generally by the character 11 and includes a conductor core 13 composed of a plurality of individually insulated wires, a protective barrier 15, an electrical insulating jell 17 in between the wires of the core 13 and the protective barrier 15, a metallic sheath 19 over the protective barrier l5, and a jacket 21 of thermoplastic material.
  • the cable 11 is assembled in the conventional manner with the core wires being first passed through a bath of molten jell l7, and then squeezed together to force out excess jell and to fill all voids in the remaining jell. Protec- .roll.
  • tive barrier 15 in the form of a tape or strip, is then applied longitudinally of the conductor core 13 with its longitudinal edges in overlapping relationship. After which, the metallic sheath 19 is provided over the wrapped core and I is covered with a molten thermoplastic material to form the jacket 21 thereon.
  • the protective barrier 15 which is formed of a film of polyethylene terephthalate having a normal flat thickness of perhaps 0.002 inches.
  • Polyethylene terephthalate films of greater thickness can be employed providing they are capable of being embossed and permanently retain the embossment or deformations set therein.
  • Embossing of the polyethylene terephthalate film may be achieved in any convenient manner, asfor example byheating such film to a temperature below its softening point, followed by nipping such film, under relatively high pressure, between a cool, engraved metal roll and a rubber covered back-up
  • the pattern-of the embossments 23 formed in the polyethylene terephthalate film are of like size and configuration and are preferably in a closely-packed array so that only linear portions of the original film appear between adjacent embossments.
  • the perimeters of the individual embossments 23 may be of any desired contour and desirably are of polygonal configuration, as for example of a hexagonal pattern asillustrated, to facilitatea close packing thereof.
  • the hexagonal embossments 23 are arranged in substantially parallel rows, as indicated by the lines 25, with the embossments in the directly adjacent rowsbeing in staggered relationship with each other. With this arrangement, only linear portions 27 of the original film remain between adjacent embossments 23. The lengths of these individual linear portions 27 will, of course, depend upon the particular configuration and size of the embossments themselves.
  • the staggered array of the closely spaced embossments provides very restricted circuitous paths along which flow of the jell 17 during cable assembly is difficult and continually retarded. More important, as illustrated in FIG.
  • overlapping edge portionsof the barrier 15 interlock with each other, that is, embossments 23 projecting from the surface of one of such overlapping edge portions mate and are gripped firmly with depressions 29 in the surface of the other of such overlapping edge portions.
  • embossments 23 projecting from the surface of one of such overlapping edge portions mate and are gripped firmly with depressions 29 in the surface of the other of such overlapping edge portions.
  • a protective barrier for said core which barrier does not absorb moisture and has a low dielec-.
  • said flexible polymeric film formed of a flexible polymeric film enveloped about said conductor core with. its longitudinal edge portions in overlapping relationship, said flexible polymeric film having rows of permanently pre-set, substantially like, individual embossments projecting from one surface thereof, said individual embossments being closely packed and in almost abutting relationship with each other, and permanently pre-set, substantially like, individual depressions in the other surface thereof, with said depressions being aligned with said embossments, the rows of embossments in said polymeric film being arranged in substantially parallel relationship, the material and surface contour of said polymeric film serving to thermally insulate said core, particularly during the application of the molten plastic material to the metallic shield, and providing mechanical protection, dielectric protection and electrical stability for said core.

Landscapes

  • Insulated Conductors (AREA)
  • Insulating Bodies (AREA)
US142211A 1971-05-11 1971-05-11 Embossed core wrap for electrical cables Expired - Lifetime US3701840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US14221171A 1971-05-11 1971-05-11

Publications (1)

Publication Number Publication Date
US3701840A true US3701840A (en) 1972-10-31

Family

ID=22499002

Family Applications (1)

Application Number Title Priority Date Filing Date
US142211A Expired - Lifetime US3701840A (en) 1971-05-11 1971-05-11 Embossed core wrap for electrical cables

Country Status (17)

Country Link
US (1) US3701840A (fr)
AT (1) AT318732B (fr)
AU (1) AU468436B2 (fr)
BE (1) BE782909A (fr)
BR (1) BR7202806D0 (fr)
CA (1) CA961127A (fr)
CH (1) CH556089A (fr)
DE (1) DE2218412A1 (fr)
ES (1) ES402507A1 (fr)
FR (1) FR2137682B1 (fr)
GB (1) GB1396594A (fr)
IL (1) IL39280A (fr)
IT (1) IT957809B (fr)
NL (1) NL7205399A (fr)
PH (1) PH9819A (fr)
SE (1) SE7205899L (fr)
ZA (1) ZA722700B (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216645A (en) * 1977-06-06 1980-08-12 Aktieselskabet Nordiske Kabel-Og Traadfabriker Wound cable and apparatus for forming cables
US5593524A (en) * 1994-11-14 1997-01-14 Philips; Peter A. Electrical cable reinforced with a longitudinally applied tape
USD418745S (en) * 1998-08-20 2000-01-11 3M Innovative Properties Company Protective bumper and sheet member with a plurality of protective bumpers
US20070256727A1 (en) * 2006-05-03 2007-11-08 Michael Gumm Elastomeric Waterproofing and Weatherproofing Photovoltaic Finishing Method and System
US20100276181A1 (en) * 2009-05-04 2010-11-04 Panduit Corp. Communication Cable With Embossed Tape Having Encapsulated Gas
US20140290978A1 (en) * 2011-12-20 2014-10-02 Mitsubishi Electric Corporation Insulation structure of lead wire, transformer having the same, and method for insulating lead wire
WO2014173482A1 (fr) * 2013-04-23 2014-10-30 Leoni Bordnetz-Systeme Gmbh Faisceau de câbles, bande d'enroulement et procédé de fabrication d'un tel faisceau de câbles
US20160155537A1 (en) * 2013-09-24 2016-06-02 Furukawa Electric Co., Ltd. Submarine cable and multilayer tape for impermeable layer of same
US10373740B2 (en) 2017-08-09 2019-08-06 Panduit Corp. Communications cable with improved isolation between wire-pairs and metal foil tape
CN110570984A (zh) * 2019-09-27 2019-12-13 长沙华脉新材料有限公司 一种高抗压电力线缆及其制备与应用

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6034706B2 (ja) * 2013-01-28 2016-11-30 矢崎総業株式会社 外装材

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US463107A (en) * 1891-11-10 Sylvania
US3244799A (en) * 1963-04-02 1966-04-05 Superior Cable Corp Electrical cable with cable core wrap
US3294387A (en) * 1959-11-27 1966-12-27 Marc A Chavannes Laminated cellular material
US3304214A (en) * 1963-06-07 1967-02-14 Whitney Blake Co Method for making electrical cable
US3332138A (en) * 1965-08-11 1967-07-25 Gen Cable Corp Method and apparatus for making precision sized tubing
US3509269A (en) * 1968-06-11 1970-04-28 Western Electric Co Thermal barriers for cables
US3575781A (en) * 1969-05-16 1971-04-20 Stauffer Hoechst Polymer Corp Plastic film wrapping material

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3397098A (en) * 1962-03-15 1968-08-13 Moser Glaser & Co Ag Method of making insulating bodies
FR1391746A (fr) * 1963-04-02 1965-03-12 Superior Cable Corp Câble électrique à noyau conducteur isolé

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US463107A (en) * 1891-11-10 Sylvania
US3294387A (en) * 1959-11-27 1966-12-27 Marc A Chavannes Laminated cellular material
US3244799A (en) * 1963-04-02 1966-04-05 Superior Cable Corp Electrical cable with cable core wrap
US3304214A (en) * 1963-06-07 1967-02-14 Whitney Blake Co Method for making electrical cable
US3332138A (en) * 1965-08-11 1967-07-25 Gen Cable Corp Method and apparatus for making precision sized tubing
US3509269A (en) * 1968-06-11 1970-04-28 Western Electric Co Thermal barriers for cables
US3575781A (en) * 1969-05-16 1971-04-20 Stauffer Hoechst Polymer Corp Plastic film wrapping material

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4216645A (en) * 1977-06-06 1980-08-12 Aktieselskabet Nordiske Kabel-Og Traadfabriker Wound cable and apparatus for forming cables
US5593524A (en) * 1994-11-14 1997-01-14 Philips; Peter A. Electrical cable reinforced with a longitudinally applied tape
USD418745S (en) * 1998-08-20 2000-01-11 3M Innovative Properties Company Protective bumper and sheet member with a plurality of protective bumpers
US20070256727A1 (en) * 2006-05-03 2007-11-08 Michael Gumm Elastomeric Waterproofing and Weatherproofing Photovoltaic Finishing Method and System
US9129727B2 (en) 2009-05-04 2015-09-08 Panduit Corp. Communication cable with embossed tape having encapsulated gas
US20100276181A1 (en) * 2009-05-04 2010-11-04 Panduit Corp. Communication Cable With Embossed Tape Having Encapsulated Gas
US20140290978A1 (en) * 2011-12-20 2014-10-02 Mitsubishi Electric Corporation Insulation structure of lead wire, transformer having the same, and method for insulating lead wire
US20160042834A1 (en) * 2013-04-23 2016-02-11 Leoni Bordnetz-Systeme Gmbh Cable set, winding tape and process for producing the cable set
WO2014173482A1 (fr) * 2013-04-23 2014-10-30 Leoni Bordnetz-Systeme Gmbh Faisceau de câbles, bande d'enroulement et procédé de fabrication d'un tel faisceau de câbles
US9831013B2 (en) * 2013-04-23 2017-11-28 Leoni Bordnetz-Systeme Gmbh Cable set, winding tape and process for producing the cable set
US20160155537A1 (en) * 2013-09-24 2016-06-02 Furukawa Electric Co., Ltd. Submarine cable and multilayer tape for impermeable layer of same
US10056171B2 (en) * 2013-09-24 2018-08-21 Furukawa Electric Co., Ltd. Submarine cable and multilayer tape for impermeable layer of same
US10373740B2 (en) 2017-08-09 2019-08-06 Panduit Corp. Communications cable with improved isolation between wire-pairs and metal foil tape
US10796823B2 (en) 2017-08-09 2020-10-06 Panduit Corp. Communications cable with improved isolation between wire-pairs and metal foil tape
CN110570984A (zh) * 2019-09-27 2019-12-13 长沙华脉新材料有限公司 一种高抗压电力线缆及其制备与应用
CN110570984B (zh) * 2019-09-27 2020-08-25 宝胜（宁夏)线缆科技有限公司 一种高抗压电力线缆及其制备与应用

Also Published As

Publication number Publication date
AT318732B (de) 1974-11-11
FR2137682A1 (fr) 1972-12-29
IL39280A0 (en) 1972-06-28
ES402507A1 (es) 1975-04-01
DE2218412A1 (de) 1972-11-23
AU468436B2 (en) 1976-01-15
GB1396594A (en) 1975-06-04
IT957809B (it) 1973-10-20
NL7205399A (fr) 1972-11-14
BR7202806D0 (pt) 1973-05-31
BE782909A (fr) 1972-09-01
FR2137682B1 (fr) 1978-05-26
CA961127A (en) 1975-01-14
ZA722700B (en) 1973-02-28
CH556089A (fr) 1974-11-15
AU4155372A (en) 1973-11-01
PH9819A (en) 1976-03-26
IL39280A (en) 1974-11-29
SE7205899L (fr) 1972-11-13

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