US3321572A - Dual laminated telephone cable sheath - Google Patents

Dual laminated telephone cable sheath Download PDF

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Publication number
US3321572A
US3321572A US486863A US48686365A US3321572A US 3321572 A US3321572 A US 3321572A US 486863 A US486863 A US 486863A US 48686365 A US48686365 A US 48686365A US 3321572 A US3321572 A US 3321572A
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US
United States
Prior art keywords
jacket
plastic
tape
bonded
cable
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
US486863A
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English (en)
Inventor
Oscar G Garner
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.)
General Cable Corp
Original Assignee
General Cable 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 General Cable Corp filed Critical General Cable Corp
Priority to US486863A priority Critical patent/US3321572A/en
Priority to GB27352/66A priority patent/GB1153152A/en
Priority to FR67417A priority patent/FR1485130A/fr
Priority to SE09521/66A priority patent/SE349689B/xx
Priority to CH1243466A priority patent/CH462265A/de
Priority to DE1640177A priority patent/DE1640177C3/de
Priority to ES0331174A priority patent/ES331174A1/es
Application granted granted Critical
Publication of US3321572A publication Critical patent/US3321572A/en
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
    • H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
    • H01B13/26—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping
    • H01B13/2613—Sheathing; Armouring; Screening; Applying other protective layers by winding, braiding or longitudinal lapping by longitudinal lapping
    • H01B13/266—Bending and adhesively bonding of a metallic screen
    • 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
    • H01B11/10—Screens specially adapted for reducing interference from external sources
    • H01B11/1016—Screens specially adapted for reducing interference from external sources composed of a longitudinal lapped tape-conductor
    • 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

Definitions

  • St-alpeth sheathing which consists of an outer plastic jacket and a laminated metallic sheath of tinned steel and aluminum with the edges of the tinned steel being soldered, and replacing this with a triple jacket construction consisting of an outer plastic jacket, an intermediate jacket formed from an adhesive polyethylene-aluminum-adhesive polyethylene laminate, known as FPA or fused aluminumpolyethylene tape, and an inner jacket formed from a polyester-aluminum foil-adhesive polyethylene laminate, known as a thin-skin jacket.
  • FPA adhesive polyethylene-aluminum-adhesive polyethylene laminate
  • Both, the intermediate and the inner jackets are sealed.
  • the intermedia-te jacket by the method disclosed in the copendiug Garner application Ser. No. 427,435 and the inner jacket by the method described in the Jachimowicz U.S. Patent No. 3,206,541, both assigned to the assignee of the present application.
  • the tapes used for the intermediate and the inner jackets have about the reversed ratio of metal to plastic; with the intermediate jacket having more met-al and the inner jacket more plastic.
  • the two sealed inner jackets give a greater reliability to this sheathing than the soldered inner jacket of the Stalpeth sheathing. This permits a reduction in the outermost plastic jacket of this triple jacke-ted construction, resulting in an overall reduction of the cable diameter. This is a significant advantage both for overhead or underground use.
  • FIGURE 1 is a diagrammatic view showing the Way in which the cable of this invention can be manufactured
  • FIGURE 2 is a greatly enlarged sectional view through the cable made in accordance with the method and apparatus shown in FIGURE 1;
  • FIGURES 3 and 4 are greatly enlarged, fragmentary sectional views taken on the lines 3-3 and 4-4 of FIG- URE l;
  • FIGURE 5 is a greatly enlarged detail view of the area 5 5 of FIGURE 2;
  • FIGURES 6 and 7 are greatly enlarged views of the areas 646 and 7 7, respectively, of FIGURE 2.
  • FIGURE 1 shows a cable core 10 consisting of a plurality of conductors individu-ally insulated with pulp or paper ribbon assembled into a core around which are wrapped core tapes 12, usually two paper tapes each S mils in thickness.
  • An inner jacket or tape 14 is formed progressively around the Wrapped core 10 as the core advances continuously in the direction indicated by the arrow 15.
  • the tape 14 is preferably a sandwich sheath having a laminated construction consisting of a thin metallic foil 16 to the opposite sides of which are securely bonded plastic coatings 18 and20 (FIG. 3). The construction of this tape or sleeve 14 will be described more fully in connection with FIGURE 5.
  • the coating 18 is a heat-scalable polyolefin coating and prefer-ably a copolymer of polyethylene modified by monomers containing reactive carboxyl groups which cause the coating to chemically bond to the metal surface of the foil 16.
  • the outer coating 20 is preferably chemically bonded to the foil 16 but made of a different plastic which has a higher softening point that the inner coating 18.
  • This outer coating 20 may be made of polyethylene terephthalate Mylan As the tape 14 is formed around the core 10, the edge portions of the tape are bent up to form radially extending tabs 22.
  • the longitudinal seam of the jacket or tape 14 passes through a heating station 24 where jets of hot gas 27 impinge against the coating 18 on the confronting faces of the tabs 22 and raise the temperature of the coating 18 to its softening or melting point so that the tabs are heat sealed to one another when they pass between pinch rolls 28 just beyond the heating station 24.
  • the plastic coating 18 may be exposed to gas flame heated to 800 degrees F.
  • the tabs 22 are preferably at least mils long to provide an elongated seam which is highly resistant vto moisture penetration along the entire length of the cable.
  • the radially extending seam is then folded over by passing the cable through a folding station 30 ⁇ which presses t-he tabs down into a lgenerally cylindrical configuration as shown in FIGURE 2.
  • This folding operation is performed by a ring 32 at the folding station 30 of FIGURE 1 and it leaves the tabs generally parallel to the adjacent surface of the circumferential portion of the jacket or tape 14 over which the tabs are folded.
  • An outer jacket or tape 34 is formed progressively around the inner jacket or tape 14 beyond the folding station 30 as illustrated in FIGURE l.
  • This outer tape has a laminated construction with a metal strip considerably thicker than the foil in the tape 14, and with plastic coating on both sides, preferably chemically vbonded to the metal.
  • the outer tape 34 is formed with a lap seam and is subjected to heat by a heater 36 at a second heating station 38, which raises the coatings on the overlapped portions of the tape at the seam to a heat sealing temperature.
  • the cable is then completed Iby passing it through an extruder 40y which eXtrudes an outer sheath 42 over the -outer tape 34.
  • This outer sheath 42 is preferably polyethylene.
  • FIGURE 2 shows the construction of the completed cable but the scale in FIGURE 2 is not large enough to illustrate the plastic coatings without exaggerating the thickness so much as to show parts completely out of proportion.
  • FIGURES 5, 6 and 7 are shown as enlargements of the structure in FIGURE 2 ⁇ at the areas 55, 6-6 and 7-7, respectively.
  • FIGURE 5 shows the core conductors with the intercalated tapes 12 covered by the inner tape 14 which is preferably made with an aluminum, copper or steel metal foil 16 between .1 and l mil in thickness.
  • the plastic coating 18 on the inside of the tape 14 is preferably between l and l0 mils in thickness.
  • the outer coating 20 may have a thickness within this same range.
  • the tape 14 its loosely over the core 10 and is preferably not bonded to the core tape 12. This results in a more flexible cable.
  • an outer tape 34 which is preferably made of metal strip 48 such as aluminum or copper having a thickness of'approxirnately 8 mils, or within a range of 6-12 mils,
  • the tape 34 has an inner plastic coating 50 and an outer plastic coating 50. These coatings are preferably of the same material as the inner coating 18 of the tape 14 so that when the overlapping edges of the outer tape 34 are heated the plastic coating of the confronting faces of these overlapping edges will bond the edges together to provide a moisture-tight seal. Each coating 50 is preferably about 2 mils thick.
  • the ratio of plastic to metal may be about eight to one for the inner jacket, but about one to two for the intermediate jacket.
  • Overlapping edges 52 and 53 of the outer tape 34 are shown in FIGURE 7. The extent of the overlapping of these edges 52 and 53 should be sufficient to produce a moisture-proof seal and experience has shown that onequarter to three-eighths inch overlap is effective for this purpose.
  • outer tape 34 4 is not bonded to the inner tape 14. This is the reason for having the outer coating 20 of the inner tape 14 made of material which will not soften and seal to the coating of the outer tape 34 when the overlapping edges of the outer tape are heated to form the seal along the seam of the outer tape.
  • FIGURE 6 shows the detailed construction of the cable at the region of the seam of the inner jacket or tape 14; and FIGURE 7 shows the seam for the outer tape. It is a feature of the invention that these seams are located ⁇ at angularly spaced regions around the circumference of the cable.
  • the outer sheath 42 is extruded in the conventional way and has a radial thickness between 60 and 125 mils.
  • This outer sheath is preferably made of polyethylene.
  • a small diameter telephone cable having overlying sealed jackets unbonded to each other and an outer sheath bonded to the outermost jacket, said cable comprising a number of individually insulated conductorsstranded into a core, a wrapping of paper tapes surrounding the cable core, over the wrapped core an inner jacket formed from a longitudinally folded tape including a metal foil with at least its inside surface covered with a plastic coating that is chemically bonded to the metal foil, the tape having edge portions that are bent outwardly in juxtaposition and bonded together into a seam, the bonded edge portions being folded down against the inner jacket, an intermediate jacket formed from a laminated tape comprising a metal strip thicker than the metal foil coated on both sides with heat-sealing plastic chemically bonded to the metal strip, the tape forming said intermediate jacket being folded longitudinally around over the inner jacket and having a lap seam which is sealed by the bonding of the plastic on the inside yof the outer overlapping edge portion to the plastic on the outside of the inner overlapping edge portion, the seams of the inner jacket and the
  • the cable described in claim 1 characterized by the tapes of the inner and the intermediate jackets having about the reversed ratio of metal to plastic, the inner jacket having more plastic and the intermediate jacket having more metal.
  • the cable described in claim 1 characterized by a plastic on the outside of the inner jacket being of different material from the plastic coating on the inside of the inner jacket and having a softening point at a substantially higher temperature than that of the plastic on the inside yof the inner jacket.
  • the cable described in claim 1 characterized by the metal of the inner jacket being of substantially less thickness than that of the intermediate jacket, and the metal component of one of the jackets being steel and providing magnetic shielding for the insulated conductors of the core.
  • the cable described in claim 4 characterized by the metal of the inner jacket being steel and of a thickness between .l and l mil, and the metal of the intermediate jacket being a different metal and of a thickness between 4 and 12 mils.
  • the cable described in claim 1 characterized by both tapes used to form the inner and intermediate jackets being coated on both sides by -plastic chemically bonded to the surfaces of the tape, the inner surface of the inner tape being bonded with a low melting polyolen and the outer surface of the inner tape being coated with a higher melting point plastic of the class consisting of high density polyethylene, polypropylene, and a polyethylene terephthalate, both sides of the intermediate jacket being coated with a polyolein copolymer and the outer sheath or jacket being made of polyethylene bonded to the intermediate jacket.
  • the cable described in claim 1 characterized by the cable containing a plurality of conductors with electrical insulation from the group consisting of pulp and ribbon paper insulation, the inner jacket being applied over the core and having a thickness between 2.1 ⁇ and 11 mils, and the intermediate jacket having a thickness between 10 and 16 mils and the sheath having a radial thickness of between 20 and 125 mils.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Insulated Conductors (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Ropes Or Cables (AREA)
US486863A 1965-09-13 1965-09-13 Dual laminated telephone cable sheath Expired - Lifetime US3321572A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US486863A US3321572A (en) 1965-09-13 1965-09-13 Dual laminated telephone cable sheath
GB27352/66A GB1153152A (en) 1965-09-13 1966-06-20 Telephone Cable Sheath
FR67417A FR1485130A (fr) 1965-09-13 1966-06-29 Câble électrique
SE09521/66A SE349689B (de) 1965-09-13 1966-07-12
CH1243466A CH462265A (de) 1965-09-13 1966-08-25 Kunststoffummanteltes elektrisches Kabel
DE1640177A DE1640177C3 (de) 1965-09-13 1966-09-13 Fernmeldekabel
ES0331174A ES331174A1 (es) 1965-09-13 1966-09-13 Perfeccionamientos en la construccion de cables.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US486863A US3321572A (en) 1965-09-13 1965-09-13 Dual laminated telephone cable sheath

Publications (1)

Publication Number Publication Date
US3321572A true US3321572A (en) 1967-05-23

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ID=23933499

Family Applications (1)

Application Number Title Priority Date Filing Date
US486863A Expired - Lifetime US3321572A (en) 1965-09-13 1965-09-13 Dual laminated telephone cable sheath

Country Status (6)

Country Link
US (1) US3321572A (de)
CH (1) CH462265A (de)
DE (1) DE1640177C3 (de)
ES (1) ES331174A1 (de)
GB (1) GB1153152A (de)
SE (1) SE349689B (de)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485689A (en) * 1966-12-06 1969-12-23 Gen Cable Corp Method and apparatus for making cable
US3507978A (en) * 1967-12-11 1970-04-21 Gen Cable Corp Sheathed electrical cable
US3530019A (en) * 1968-05-28 1970-09-22 Gen Cable Corp Apparatus and method for making laminated cable sheath
US3531341A (en) * 1967-09-22 1970-09-29 British Insulated Callenders Electric cables
US3564110A (en) * 1966-12-06 1971-02-16 Bell Telephone Labor Inc Electrical cables
US3790694A (en) * 1972-06-07 1974-02-05 Pirelli Filled telephone cable with bonded screening layer
US3886015A (en) * 1973-08-23 1975-05-27 Robert F Turner Composite thread and process for making the same
US4071388A (en) * 1973-11-26 1978-01-31 Sumitomo Electric Industries, Ltd. Impulse heat joining of wrapping tapes for wire cables
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
US4477693A (en) * 1982-12-09 1984-10-16 Cooper Industries, Inc. Multiply shielded coaxial cable with very low transfer impedance
US4510346A (en) * 1983-09-30 1985-04-09 At&T Bell Laboratories Shielded cable
US4746767A (en) * 1987-02-27 1988-05-24 Neptco Incorporated Shielded electrical cable construction
US4767891A (en) * 1985-11-18 1988-08-30 Cooper Industries, Inc. Mass terminable flat cable and cable assembly incorporating the cable
US5367123A (en) * 1993-03-15 1994-11-22 The Zippertubing Co. Electrically conductive sheath for ribbon cable
EP0867891A1 (de) * 1997-03-27 1998-09-30 Alcatel Datenübertragungskabel und sein Herstellungsverfahren
US6215070B1 (en) 1996-09-30 2001-04-10 Pirelli Cables (2000) Limited Electric power cables
US6242692B1 (en) 1997-09-11 2001-06-05 Pirelli Cables (2000) Limited Electric power cables
US6246006B1 (en) 1998-05-01 2001-06-12 Commscope Properties, Llc Shielded cable and method of making same
US6384337B1 (en) 2000-06-23 2002-05-07 Commscope Properties, Llc Shielded coaxial cable and method of making same
US6433273B1 (en) * 2000-10-20 2002-08-13 The Zippertubing Co. Heat-shielding jacket
US20020170729A1 (en) * 2001-05-18 2002-11-21 Yazaki Corporation Conductive thin film sheet, shield harness and method of manufacturing the same
US20050016755A1 (en) * 2003-03-13 2005-01-27 Martinez Leonel Yanez Dry, water-resistant coaxial cable and manufacturing method of the same
US20070144755A1 (en) * 2005-11-10 2007-06-28 Paul Lipkens Electric cable with an improved screen
CN103078165A (zh) * 2013-01-14 2013-05-01 中利科技集团股份有限公司 漏缆纵包预成型模具结构
US20150170801A1 (en) * 2013-12-13 2015-06-18 Trican Well Service, Ltd. System for manufacturing a coil tubing with the tubing encapsulated cable incorporated into the coil tubing
CN111508669A (zh) * 2020-04-22 2020-08-07 华迅工业(苏州)有限公司 一种制备传输电缆屏蔽结构的方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928612C2 (de) * 1979-07-14 1986-01-30 AEG KABEL AG, 4050 Mönchengladbach Vorrichtung zur Herstellung eines Kabels
EP0024631A1 (de) * 1979-08-13 1981-03-11 The Dow Chemical Company Elektrisches Kabel mit Wassersperre
DE2949686A1 (de) * 1979-12-11 1981-07-23 AEG-Telefunken Kabelwerke AG, Rheydt, 4050 Mönchengladbach Verfahren und vorrichtung zur herstellung eines kabels
EP0759624A1 (de) * 1995-08-19 1997-02-26 Alcatel Kabel AG & Co. Elektrisches Kabel zur Nachrichtenübertragung
DE69708040T2 (de) * 1997-02-12 2002-07-11 Alcatel Cabling Systems S.A./N.V., Bruessel/Bruxelles Verbindungskabel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB968061A (en) * 1963-01-02 1964-08-26 Pirelli General Cable Works Improvements in or relating to screened insulated electric conductors
US3206541A (en) * 1963-04-29 1965-09-14 Gen Cable Corp Sheathed electrical cable
US3233036A (en) * 1963-11-01 1966-02-01 Gen Cable Corp Corrosion proof shielding tape for shielding telephone cables

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB968061A (en) * 1963-01-02 1964-08-26 Pirelli General Cable Works Improvements in or relating to screened insulated electric conductors
US3206541A (en) * 1963-04-29 1965-09-14 Gen Cable Corp Sheathed electrical cable
US3233036A (en) * 1963-11-01 1966-02-01 Gen Cable Corp Corrosion proof shielding tape for shielding telephone cables

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485689A (en) * 1966-12-06 1969-12-23 Gen Cable Corp Method and apparatus for making cable
US3564110A (en) * 1966-12-06 1971-02-16 Bell Telephone Labor Inc Electrical cables
US3531341A (en) * 1967-09-22 1970-09-29 British Insulated Callenders Electric cables
US3507978A (en) * 1967-12-11 1970-04-21 Gen Cable Corp Sheathed electrical cable
US3530019A (en) * 1968-05-28 1970-09-22 Gen Cable Corp Apparatus and method for making laminated cable sheath
US3790694A (en) * 1972-06-07 1974-02-05 Pirelli Filled telephone cable with bonded screening layer
US3886015A (en) * 1973-08-23 1975-05-27 Robert F Turner Composite thread and process for making the same
US4071388A (en) * 1973-11-26 1978-01-31 Sumitomo Electric Industries, Ltd. Impulse heat joining of wrapping tapes for wire cables
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
US4477693A (en) * 1982-12-09 1984-10-16 Cooper Industries, Inc. Multiply shielded coaxial cable with very low transfer impedance
US4510346A (en) * 1983-09-30 1985-04-09 At&T Bell Laboratories Shielded cable
US4767891A (en) * 1985-11-18 1988-08-30 Cooper Industries, Inc. Mass terminable flat cable and cable assembly incorporating the cable
US4746767A (en) * 1987-02-27 1988-05-24 Neptco Incorporated Shielded electrical cable construction
US5367123A (en) * 1993-03-15 1994-11-22 The Zippertubing Co. Electrically conductive sheath for ribbon cable
US6215070B1 (en) 1996-09-30 2001-04-10 Pirelli Cables (2000) Limited Electric power cables
EP0867891A1 (de) * 1997-03-27 1998-09-30 Alcatel Datenübertragungskabel und sein Herstellungsverfahren
FR2761515A1 (fr) * 1997-03-27 1998-10-02 Alsthom Cge Alcatel Cable pour la transmission de donnees et son procede de fabrication
US6259019B1 (en) 1997-03-27 2001-07-10 Alcatel Cable for transmitting data and method of manufacturing it
US6242692B1 (en) 1997-09-11 2001-06-05 Pirelli Cables (2000) Limited Electric power cables
US6246006B1 (en) 1998-05-01 2001-06-12 Commscope Properties, Llc Shielded cable and method of making same
US6384337B1 (en) 2000-06-23 2002-05-07 Commscope Properties, Llc Shielded coaxial cable and method of making same
US6433273B1 (en) * 2000-10-20 2002-08-13 The Zippertubing Co. Heat-shielding jacket
US20020170729A1 (en) * 2001-05-18 2002-11-21 Yazaki Corporation Conductive thin film sheet, shield harness and method of manufacturing the same
US6806417B2 (en) * 2001-05-18 2004-10-19 Yazaki Corporation Conductive thin film sheet, shield harness and method of manufacturing the same
US20050016755A1 (en) * 2003-03-13 2005-01-27 Martinez Leonel Yanez Dry, water-resistant coaxial cable and manufacturing method of the same
US8173900B2 (en) * 2003-03-13 2012-05-08 Servicios Condumex S.A. De Cv Dry, water-resistant coaxial cable and manufacturing method of the same
US20070144755A1 (en) * 2005-11-10 2007-06-28 Paul Lipkens Electric cable with an improved screen
CN103078165A (zh) * 2013-01-14 2013-05-01 中利科技集团股份有限公司 漏缆纵包预成型模具结构
CN103078165B (zh) * 2013-01-14 2014-09-24 中利科技集团股份有限公司 漏缆纵包预成型模具结构
US20150170801A1 (en) * 2013-12-13 2015-06-18 Trican Well Service, Ltd. System for manufacturing a coil tubing with the tubing encapsulated cable incorporated into the coil tubing
CN111508669A (zh) * 2020-04-22 2020-08-07 华迅工业(苏州)有限公司 一种制备传输电缆屏蔽结构的方法
CN111508669B (zh) * 2020-04-22 2021-07-06 华迅工业(苏州)有限公司 一种制备传输电缆屏蔽结构的方法

Also Published As

Publication number Publication date
SE349689B (de) 1972-10-02
DE1640177B2 (de) 1975-01-30
GB1153152A (en) 1969-05-29
DE1640177A1 (de) 1970-11-05
CH462265A (de) 1968-09-15
ES331174A1 (es) 1967-07-01
DE1640177C3 (de) 1975-09-04

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