US2948647A - Manufacture of insulated electric conductors - Google Patents

Manufacture of insulated electric conductors Download PDF

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Publication number
US2948647A
US2948647A US492545A US49254555A US2948647A US 2948647 A US2948647 A US 2948647A US 492545 A US492545 A US 492545A US 49254555 A US49254555 A US 49254555A US 2948647 A US2948647 A US 2948647A
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US
United States
Prior art keywords
sheath
paste
cable
extruding
metal
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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
US492545A
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English (en)
Inventor
Lorch Hermann Richard
Mccleery James Alexander
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Balfour Beatty PLC
Original Assignee
BICC PLC
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Filing date
Publication date
Application filed by BICC PLC filed Critical BICC PLC
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Publication of US2948647A publication Critical patent/US2948647A/en
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • H01B13/30—Drying; Impregnating
    • 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
    • H01B7/16—Rigid-tube cables

Definitions

  • This invention relates to the manufacture of insulated electric conductors of the kind comprising one or more wires embedded in a body of compressed heat-resistant powder serving as the insulant, the whole being enclosed in a tube of metal.
  • the method of manufacture is of the kind comprising the following steps: extruding on the conductor, or conductors, a covering of paste contain-- ing the powdered insulant and water, drying the paste, applying a sheath over the covering and finally drawing down the sheath to consolidate and compress the powder. In such a method it has already been proposed to dry the paste before the sheath is applied.
  • the present development is based on the discovery that by establishing suitable conditions it is practicable to sheath the cable while the paste is still wet and dry the insulant after sheathing has been completed.
  • the rocedure in accordance with the invention comprises extruding the paste on the wire or wires; applying to the outside of the paste a pervious C6VIifig extruding the sheath over the covered paste with asmall clearance, as hereinafter defined; putting the coil of sheathed conductor in an oven', where itis heated for a time and at a temperature appropriate for securing drying; and then drawing down the sheath to remove the clearance and consolidate" and 'c'ompress the powder.
  • the coil may or -rnay not becomes before drawing down the sheath.
  • the assembly may also be further drawndown for elong'ation of sheathand conduct'ors if required.
  • the pervious covering is preferably a layer" of thin metal foil inthe form of a tape applied about the paste either as a helical lapping or by longitudinally folding it into a tube. adjacent edges of the tape will not be sealed. When in the ofhelical lappingthere is preferably a small degree of overlapping between adjacent turns.
  • the tape covering ensures the holding of the paste in positioii while permitting the escape of steam between theadjacent edges.
  • FIG 2 also in part section, illustrates the extrusion of the sheath on the core made as shown in Figure 1,
  • Figure 3 represents in part section the arrangement of a number of coils of sheathed cable in a drying chamber
  • Figure 5 is a plan illustrating an alternative manner of applying a pervious covering to the insulated wires
  • Figure 8 is an enlarged segmental view of the extra sion nozzle of Figure 2.
  • the cable comprises two single conductor Wires 1, 2 embedded in, so as to be completely surrounded and insulated from one another by, an extruded body of insulating composition 3.
  • This composition when dry comprises compressed powdered talc and bentom't'e.
  • a pervions covering 4 comprising a helical wrapping of aluminum tape applied with overlapping turns.
  • Overall is an extruded aluminum sheath 5.
  • This represents the cable prior to being subject to drawing down iii the manner hereinafter described with reference to Figure 4, and in this stage there exists between the sheath 5' and the pervious' covering 4 a small clearance 6 which permits the escape of steam along the length of the cable duringthe drying of the insulation 3.
  • the conductors 1 2 are drawnfrorn two reels 7', 8 through a paste extruding machine 9;
  • the paste 3 is forced by the usual means" 14 is rotatably mounted a holder 15 for a pad 1 6 or aluminum tape in the form of a flat spiral. From pad 16 the tape 4 is led over a guide 18 to core body 1-2.
  • the device for producing the side ways movement is diagrammatically represente'dby the threaded shaft 22 controlled by a gear box 23'.
  • drum 20 is now mounted at the back 'of a metal extrusion machine 24, as shown in Figure 2 for the application' of the aluminum sheath 5 with a small clearance
  • the extrusion machine comprises inthe usual manner two'plungers 25 which press the metal 26 out of two con Other pastes may be used; for instance one tainers into an extrusion chamber 27 where the sheath is formed between two die elements 23 and 29.
  • the sheath is applied with the small clearance 6 shown diagrammatically in Figures 4 and 7.
  • the sheathed cable is taken up in the form of a coil 30 on a swift 31 rotated in any convenient manner about a vertical spindle 32.
  • the coil is now transferred to a drying oven 33 shown diagrammatically in section in Figure 3.
  • a drying oven 33 shown diagrammatically in section in Figure 3.
  • the coils 30 are completely enclosed in the oven with the ends 34 of the sheaths open to permit the escape of steam.
  • Heating elements 35 are arranged in the wall of the oven and there is provided an entry 36 for dry air and an exit 37 for the steam escaping from the ends of the cable.
  • the sheathed cable After drying the sheathed cable is drawn through a die 38 illustrated in Figure 4.
  • the die has a conical working face 39 and in being drawn through it the diameter of the sheath is reduced to eliminate all the clearance space 6, thus leaving the sheath tight on the metal taped insulation.
  • the cable may be drawn through subsequent dies to finally compress and consolidate the insulation and may be afterwards drawn down again to obtain elongation of the complete cable.
  • FIGs 5 and 6 there is shown the formation of the pervious covering from an aluminum tape 40 folded longitudinally about the core body 12 as it leaves the paste extruder 9, the latter not being shown in these figures.
  • the tape 40 is drawn from a coil 41 mounted beneath the advanced core body 12 and rotatable about an axis 42 extending at right angles to the direction of movement of the core body.
  • the core body and tape are drawn together through a tapered die 43 which forms the tape into a cylindrical cover about the underlying insulation.
  • the edges of the tape may butt against one another or may not completely meet or may slightly overlap. There being no seal between the edges of the tape, the moisture is permitted to escape from the insulation during the drying process.
  • the other stages in the manufacture of this cable are identical with these already described in connection with the other figures.
  • the coil For the heating it is important that the coil should be completely enclosed in the oven and the heating carried out so as to obtain substantial uniformity of rise of temperature throughout the length of the coil, thus avoiding the possibility of local condensation of steam.
  • the time and temperature of heating are so adjusted as to obtain complete drying in a reasonable time.
  • the rise in temperature should be so regulated that the rate of evolution of steam does not become excessive at any stage.
  • An example of a suitable procedure is raising the temperature gradually to about 400 C. and holding it there from two to four hours. Since at this temperature the coil is too hot for convenient handling and may also damage the usual lubricant used in the subsequent drawing down operation, it will usually be allowed to cool but not necessarily to room temperature.
  • the improved procedure has important advantages in facilitating the organisation of the manufacture, since the several definite steps in the manufacture can take place without any close correlation in time.
  • a method of making an electric cable comprising in sequence the steps of extruding about a wire a body of paste containing powdered heat-resisting insulant and. water, enclosing the body of paste in a pervious covering, extruding over the covered paste body a metal sheath with a small clearance between the sheath and the body, said small clearance having a transverse dimension less: than the transverse dimension of the body and being sufficient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body and heating the coiled body in an oven to dry the insulant and finally drawing down the metal sheath to remove the clearance.
  • a method of making an electric cable comprising in sequence the steps of extruding about a wire a body of paste containing powdered heat-resisting insulant and water, wrapping the body of paste with thin tape, the edges of the tape providing between them a passage for the escape of steam from the paste body, extruding over the tape-covered body a metal sheath with a small clearance between the sheath and the body, said small clearance having a transverse dimension less than the transverse dimension of the body and being suflicient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body and heating the coiled body in an oven to dry the insulant and drawing down the metal sheath to remove the clearance.
  • a method of making an electric cable comprising in sequence the steps of extruding about a wire a body of paste containing powdered heat-resisting insulant and water, covering the paste body with a helical wrapping of thin metal tape with overlapping turns providing between them a passage for the escape of steam from the paste, extruding over the tape-covered body a metal sheath with a small clearance between the sheath and the body, said small clearance having a transverse dimension less than the transverse dimension of the body and being suflicient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body and heating the coiled body in an oven to dry the insulant and finally drawing down the metal sheath to remove the clearance.
  • a method of making an electric cable including in sequence the steps of extruding about a wire a body of paste containing powdered heat-resisting insulant and water, covering the paste body with a metal tape extending parallel with the body and bent transversely into a tube enclosing the body with the adjacent edges of the tape providing between them a passage for the escape of steam from the paste, extruding over the tape-covered body a.
  • metal sheath with a small clearance between the sheath and the body, said small clearance having a transverse dimension less than the transverse dimension of the body and being sufficient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body and heating the coiled body in an oven to dry the insulant and drawing down the metal sheath to remove the clearance.
  • a method of making an electric cable comprising in sequence the steps of completely embedding at least two wires in an extruded body of paste containing powdered heat-resistant insulant and water, enclosing the body of paste in a pervious covering, extruding over the covered paste body a metal sheath with a small clearance between the sheath and the body, said small clearance having a transverse dimension less than the transverse dimension of the body and being sufiicient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body in an oven to dry the insulant and finally drawing down the metal sheath to remove the clearance.
  • a method of making an electric cable including in sequence the steps of extruding about a wire a body of paste containing powdered heat-resistant insulant and water, enclosing the body of paste in a pervious covering, extruding over the covered paste body a metal sheath with a small clearance between the sheath and body, said small clearance having a transverse dimension less than the transverse dimension of the body and being sufficient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body, raising the temperature of the coiled body uniformly throughout its length to the drying temperature of the paste, maintaining the drying temperature for a period to dry the paste and finally drawing down the metal sheath to re move the clearance.
  • a method. of making an electric cable including in sequence the steps of extruding about a wire a body of paste containing powdered heat-resistant insulant and water, enclosing the body of paste in a pervious covering, extruding over the covered paste body a metal sheath with a small clearance between the sheath and body, said small clearance having a transverse dimension less than the transverse dimension of the body and being sufiicient to provide a free path for the travel of steam along the cable, coiling the metal sheathed body, raising the temperature of the coiled body uniformly throughout its length to the drying temperature of the paste, maintaining the drying temperature for a period to dry the paste, cooling the coiled body and finally drawing down the metal sheath to remove the clearance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Insulated Conductors (AREA)
US492545A 1954-03-12 1955-03-07 Manufacture of insulated electric conductors Expired - Lifetime US2948647A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB7204/54A GB757249A (en) 1954-03-12 1954-03-12 Improvements in the manufacture of insulated electric conductors

Publications (1)

Publication Number Publication Date
US2948647A true US2948647A (en) 1960-08-09

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Family Applications (1)

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US492545A Expired - Lifetime US2948647A (en) 1954-03-12 1955-03-07 Manufacture of insulated electric conductors

Country Status (7)

Country Link
US (1) US2948647A (enrdf_load_stackoverflow)
BE (1) BE536345A (enrdf_load_stackoverflow)
DE (1) DE1012349B (enrdf_load_stackoverflow)
ES (1) ES220626A1 (enrdf_load_stackoverflow)
FR (1) FR1120447A (enrdf_load_stackoverflow)
GB (1) GB757249A (enrdf_load_stackoverflow)
NL (2) NL195413A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152028A (en) * 1960-06-23 1964-10-06 Amp Inc Method of making a lead cable assembly
EP0048426A1 (fr) * 1980-09-23 1982-03-31 LES CABLES DE LYON Société anonyme dite: Procédé de fabrication d'une préforme pour câble électrique à isolant minéral comprimé
US6337441B1 (en) * 1997-01-21 2002-01-08 Koakkus Kabushiki Kaisha Shielded multiconductor cable and manufacturing method therefor
US20170203338A1 (en) * 2016-01-19 2017-07-20 Harr Technologies, Llc Forward articulating cleaning and removal apparatus and method
CN107478560A (zh) * 2017-08-23 2017-12-15 成都本华清博科技有限公司 一种验证水能否透过护套进入复合绝缘子芯棒护套界面的方法
CN118366735A (zh) * 2024-06-20 2024-07-19 四川金力电缆集团有限公司 一种耐低温电缆的制作装置及方法

Families Citing this family (3)

* 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
US4949894A (en) * 1984-06-07 1990-08-21 Olin Corporation Method and apparatus for forming ultra-small optical fiber cable assemblies
US5683778A (en) * 1992-12-09 1997-11-04 Crosier; Robert A. Braided graphite-foil and method of production

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US435629A (en) * 1890-09-02 holcombe
US1233807A (en) * 1914-01-03 1917-07-17 Gen Electric Method of making insulated wires.
GB458257A (en) * 1934-03-12 1936-12-14 Le Conducteur Electr Blinde In Improvements in or relating to the manufacture of electric cables or other insulated conductors having mineral powder insulation
US2251826A (en) * 1939-12-18 1941-08-05 Kennecott Wire And Cable Compa Making metal-sheathed cables
GB631127A (en) * 1947-01-20 1949-10-27 Standard Telephones Cables Ltd Improvements in or relating to electric cables
CH266160A (de) * 1947-01-20 1950-01-15 Standard Telephon & Radio Ag Verfahren, um elektrische Kabel mit einem Metallmantel zu versehen.
US2680086A (en) * 1950-11-14 1954-06-01 W T Glover & Co Ltd Manufacture of insulated electric conductors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE839664C (de) * 1948-10-02 1952-05-23 Siemens Ag Verfahren zur Herstellung elektrischer Leitungen mit mineralischer Isolierung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US435629A (en) * 1890-09-02 holcombe
US1233807A (en) * 1914-01-03 1917-07-17 Gen Electric Method of making insulated wires.
GB458257A (en) * 1934-03-12 1936-12-14 Le Conducteur Electr Blinde In Improvements in or relating to the manufacture of electric cables or other insulated conductors having mineral powder insulation
US2251826A (en) * 1939-12-18 1941-08-05 Kennecott Wire And Cable Compa Making metal-sheathed cables
GB631127A (en) * 1947-01-20 1949-10-27 Standard Telephones Cables Ltd Improvements in or relating to electric cables
CH266160A (de) * 1947-01-20 1950-01-15 Standard Telephon & Radio Ag Verfahren, um elektrische Kabel mit einem Metallmantel zu versehen.
US2680086A (en) * 1950-11-14 1954-06-01 W T Glover & Co Ltd Manufacture of insulated electric conductors

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152028A (en) * 1960-06-23 1964-10-06 Amp Inc Method of making a lead cable assembly
EP0048426A1 (fr) * 1980-09-23 1982-03-31 LES CABLES DE LYON Société anonyme dite: Procédé de fabrication d'une préforme pour câble électrique à isolant minéral comprimé
US6337441B1 (en) * 1997-01-21 2002-01-08 Koakkus Kabushiki Kaisha Shielded multiconductor cable and manufacturing method therefor
US20170203338A1 (en) * 2016-01-19 2017-07-20 Harr Technologies, Llc Forward articulating cleaning and removal apparatus and method
CN107478560A (zh) * 2017-08-23 2017-12-15 成都本华清博科技有限公司 一种验证水能否透过护套进入复合绝缘子芯棒护套界面的方法
CN107478560B (zh) * 2017-08-23 2020-07-28 成都本华清博科技有限公司 一种验证水能否透过护套进入复合绝缘子芯棒护套界面的方法
CN118366735A (zh) * 2024-06-20 2024-07-19 四川金力电缆集团有限公司 一种耐低温电缆的制作装置及方法

Also Published As

Publication number Publication date
BE536345A (enrdf_load_stackoverflow)
NL89748C (enrdf_load_stackoverflow)
NL195413A (enrdf_load_stackoverflow)
DE1012349B (de) 1957-07-18
ES220626A1 (es) 1955-05-01
GB757249A (en) 1956-09-19
FR1120447A (fr) 1956-07-05

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