US2286759A - Method of making insulated wire of small or irregular cross-section - Google Patents

Method of making insulated wire of small or irregular cross-section Download PDF

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Publication number
US2286759A
US2286759A US366176A US36617640A US2286759A US 2286759 A US2286759 A US 2286759A US 366176 A US366176 A US 366176A US 36617640 A US36617640 A US 36617640A US 2286759 A US2286759 A US 2286759A
Authority
US
United States
Prior art keywords
wire
section
insulated
coating
conductor
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
US366176A
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English (en)
Inventor
Winton I Patnode
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 Electric Co
Original Assignee
General Electric Co
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
Priority to FR857432D priority Critical patent/FR857432A/fr
Priority to GB13486/40A priority patent/GB540203A/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US366176A priority patent/US2286759A/en
Priority to FR51240D priority patent/FR51240E/fr
Application granted granted Critical
Publication of US2286759A publication Critical patent/US2286759A/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
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/308—Wires with resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/0014—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for shaping tubes or blown tubular films
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S118/00—Coating apparatus
    • Y10S118/18—Wire and cord die

Definitions

  • the magnet wires insulated or coated by'either of these methods are of circular cross-section, and although wires of square or rectangular cross-section have been so insulated, the coating of wires of other than circular cross-section has always been kept to a minimum owing to two disadvantages in the processes.
  • coating a rectangular wire with an enamel or similar liquid composition by the conventional method of drawing the wire through a bath of the liquid composition and then baking the coating to harden it, results in a coating that is thick on the fiat surfaces of the conductor and very thin on the edges or angular parts of the conductor.
  • conductors insulated with polyvinyl acetal type materials that is, resinous compositions comprising the reaction product of an aldehyde with a hydrolyzedpolymerized vinyl ester, lend themselves to such mechanical treatment as above noted and can be reduced in size or shape without injury to the insulation film.
  • coated wires can be deformed mechanically as by bending or hammering at any particular point without injury to the insulation at the point of deformation, it was not expected that such insulated wire could be continuously altered in cross-sectional size and shape, as by rolling, drawing or swaging, and despite such drastic ,mechanical treatment of the film, preserve its continuity which is essential in the production of insulated wire.
  • the process described herein overcomes the difiiculties inherent in the previous methods of manufacturing conductors of comparatively small diameter or conductors of substantially non-circular crosssection provided with uniform resinous insulating coatings.
  • the present invention permits the use of the usual coating apparatus for applying the polyvinyl acetal resins to the wire which, after baking to harden the film, can be passed through ordinary rolls, such as turks head rolls, to produce flat or substantially rectangular wire, or drawn through the usual wire drawing dies to produce wire of tically restricted the industry to the use of round small size or cross-section without impairing the continuity of the insulating film.
  • the hereindescribed process permits a Substantial saving in cost, since wires of many difi'erent cross-sectional dimensions can be manufactured from one standard round insulated wire.
  • a wire 0.032" in diameter coated with a 0.001" layer of the polyvinyl acetal resin enamel can be continuously cold rolled to a flat or substantially rectangular wire approximately 0.015" thick and 0.047 wide without breaking the insulating film.
  • a wire having a diameter of 0.0089" and an insulating coating 0.0008" thick can be rolled by passing the wire through suitable rolls until a flat wire 0.006" by 0.0141" was obtained.
  • This wire when tested for insulation breakdown by dipping the wire connected to one electric supply lead into a bath of mercury connected to the other supply lead, shows no breaks in the insulating film under ordinary voltage requirements whereas wires insulated with ordinary enamels will show numerous breaks in the enamel after being subjected to the rolling treatment. Since it effectively occupies less space when wound into a coil than round wire of the same cross-sectional area, the flat or rectangular wire so produced can be packed or wound closer thanround wire so that in winding coils such as instrument coils and the like, more rectangular wire than round wire can be applied for equal coil volume or size.
  • a suitably coated 2 mil wire may be continuously drawn to one-quarter its original crosssection without impairing the insulation while a wire 18 mils in diameter coated with 1.0 mil layer of the enamel may be reduced by drawing to a diameter of 11.3 mils without breaking the enamel film.
  • the extremely fine wire is particularly useful, in that instrument coils now may be wound from previously and uniformly insulated wire of a size heretofore unattainable.
  • Figure 1 illustrates one arrangement whereby a coated wire of circular cross-section may be converted into an insulated wire having a substantially rectangular cross-section
  • Figure 4 shows an arrangement whereby a similarly coated wire may be reduced in cross-sectional area.
  • the remaining Figures 2, 3, 5 and 6 are enlarged views of the insulated wire before and after being subjected to mechanical working.
  • an insulated wire such as shown in Figure 5 may have its cross-sectional area reduced as shown in Figure 6, by passing the wire through a wire drawing die such as the die shown in crosssection in Figure 4, in which aproperly drilled diamond 5 is mounted. in a support 6. It is to be understood that the shape or size of the insulated wire may be altered to even greater extent than indicated in the drawing.
  • the rolled conductor shown in Figure 3 or the drawn conductor of Figure 6 can be further worked to either a flatter or finer insulated conductor depending to some extent on the original size of the conductor and thickness of the baked insulating coating.
  • a considerable altering of the cross-sectional profile of the conductor is desired, it is usually best to obtain the desired result by a number of passes through progressively smaller dies or rolls.
  • a rolled conductor, such as shown in Figure 3 may be made to assume a more rectangular shape by' passing it through a pair of rolls similar to those shown in Figure 1 positioned at right angles to the rolls previously used. In every instance it is to be noted that some reduction in the thickness of the enamel coating takes place.
  • the important feature is that, by these methods, it is possible to prepare extremely fine or substantially rectangular wire having practically uniform and wholly continuous insulation thereon, which wire is superior to that prepared by the usual methods previously attempted wherein a liquid coating material is applied to a very fine or non-circular conductor in its final shape.
  • the cold working of the copper wire may harden it to a springy condition, which is a disadvantage in winding coils or for many other uses, it is desirable to anneal the coated wire to soften it afterit has been cold worked.
  • the anneal may be carried out by heating the springy wire in a high frequency electricv field ment will not impair or otherwise alter the desirable properties of the enamel nor will the film be broken by subsequent winding operations.
  • the time required for the anneal will depend on the wire used but will ordinarily be less than one minute.
  • the method of forming an insulated conductor having a closely-adhering, uniform coating thereon which comprises coating a conductor with a liquid coating composition comprising the reaction product of an aldehyde and a hydrolyzed polyvinyl ester, baking said coated con-.
  • ductor to harden the coating thereon, continuously drawing said coated conductor through a wire drawing die to alter the diameter thereof, and annealing said drawn conductor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Insulated Conductors (AREA)
  • Organic Insulating Materials (AREA)
US366176A 1939-08-25 1940-11-18 Method of making insulated wire of small or irregular cross-section Expired - Lifetime US2286759A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR857432D FR857432A (fr) 1939-08-25 1939-07-06 Nouveaux isolants électriques adaptés à l'émaillage des conducteurs et des bobines, et leur mode d'application
GB13486/40A GB540203A (en) 1939-08-25 1940-08-26 Improved method of making insulated wire of small or non-circular cross-section
US366176A US2286759A (en) 1939-08-25 1940-11-18 Method of making insulated wire of small or irregular cross-section
FR51240D FR51240E (fr) 1939-08-25 1940-11-30 Nouveaux isolants électriques adaptés à l'émaillage des conducteurs et des bobines, et leur mode d'application

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29187339A 1939-08-25 1939-08-25
US366176A US2286759A (en) 1939-08-25 1940-11-18 Method of making insulated wire of small or irregular cross-section

Publications (1)

Publication Number Publication Date
US2286759A true US2286759A (en) 1942-06-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US366176A Expired - Lifetime US2286759A (en) 1939-08-25 1940-11-18 Method of making insulated wire of small or irregular cross-section

Country Status (3)

Country Link
US (1) US2286759A (fr)
FR (2) FR857432A (fr)
GB (1) GB540203A (fr)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2506320A (en) * 1945-12-06 1950-05-02 Anaconda Wire & Cable Co Method of preparing solutions of mixtures of siloxane resin and polyvinyl acetal resin, wherein cresylic acid is used as one of the solvents
US2516930A (en) * 1944-04-14 1950-08-01 Sperry Corp Filament forming method
US2543936A (en) * 1947-09-22 1951-03-06 Julian L Reynolds Apparatus for covering a metallic core with a cast layer of another metal
US2550669A (en) * 1948-12-27 1951-05-01 American Steel & Wire Co Flexible conduit
US2550670A (en) * 1948-12-27 1951-05-01 American Steel & Wire Co Flexible conduit
US2736957A (en) * 1951-03-08 1956-03-06 Siemens Ag Manufacture of copper wire for varnish-insulated wires
US2770014A (en) * 1953-08-25 1956-11-13 Itt Sizing of thermoplastic cable cores
US2867848A (en) * 1956-11-23 1959-01-13 Phillips Petroleum Co Heat-stress cracking resistance of thermoplastic filamentous articles
US2885777A (en) * 1955-02-08 1959-05-12 Western Electric Co Methods of and apparatus for coating articles
DE975586C (de) * 1943-01-29 1962-02-01 Hackethal Draht Und Kabel Werk Verfahren zur Herstellung von elektrischen Leitern mit einer biegsamen Isolierung aus thermoplastischen Kunststoffen
US3076262A (en) * 1957-10-21 1963-02-05 John T Riddell Inc Method of making a metal reinforced resinous structure
US3087240A (en) * 1958-09-29 1963-04-30 Texas Instruments Inc Method of making ceramic-to-metal composite stock
US3141227A (en) * 1958-09-29 1964-07-21 Gen Electric Method of nuclear fuel and control element fabrication
US3218693A (en) * 1962-07-03 1965-11-23 Nat Res Corp Process of making niobium stannide superconductors
US3312773A (en) * 1965-08-23 1967-04-04 Gen Electric Insulated electric conductor and method of making the same
US3348183A (en) * 1966-05-02 1967-10-17 Gen Electric Electrical coils and methods for producing same
US3648506A (en) * 1970-02-16 1972-03-14 Gen Electric Apparatus and method for winding electrical coils
US3811311A (en) * 1972-04-07 1974-05-21 Anaconda Co Making flat copper-clad steel wire
US4207427A (en) * 1977-03-16 1980-06-10 Industrie Pirelli S.P.A. Electrical power cable with stranded insulated wires
US5396212A (en) * 1992-04-27 1995-03-07 Cooper Industries, Inc. Transformer winding
US20030074918A1 (en) * 2001-10-19 2003-04-24 Giuseppe Disegna Method of making jewellery goods and wearable multicolor ornamental articles manufactured with such products
US20040055352A1 (en) * 2002-08-13 2004-03-25 Nexans Method of continuous production of metal wires
US20080139046A1 (en) * 2006-10-23 2008-06-12 Hiroyuki Semba Coaxial cable and method for manufacturing the same
US7617847B1 (en) 2006-12-01 2009-11-17 Clerkin Thomas M Apparatus and method for forming wire
US20140374135A1 (en) * 2012-03-14 2014-12-25 Yazaki Corporation Coaxial electric wire and method for manufacturing the same
CN104575862A (zh) * 2013-10-21 2015-04-29 雷米技术有限公司 使绝缘导体成形和退火的方法
US20150206626A1 (en) * 2014-01-17 2015-07-23 Unimac Ltd. Insulated wire
US20150206627A1 (en) * 2014-01-17 2015-07-23 Unimac Ltd. Insulated wire

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE895494C (de) * 1950-04-21 1953-11-02 Beck & Co G M B H Dr Verfahren zur Herstellung von Kunstharzlacken

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE975586C (de) * 1943-01-29 1962-02-01 Hackethal Draht Und Kabel Werk Verfahren zur Herstellung von elektrischen Leitern mit einer biegsamen Isolierung aus thermoplastischen Kunststoffen
US2516930A (en) * 1944-04-14 1950-08-01 Sperry Corp Filament forming method
US2506320A (en) * 1945-12-06 1950-05-02 Anaconda Wire & Cable Co Method of preparing solutions of mixtures of siloxane resin and polyvinyl acetal resin, wherein cresylic acid is used as one of the solvents
US2543936A (en) * 1947-09-22 1951-03-06 Julian L Reynolds Apparatus for covering a metallic core with a cast layer of another metal
US2550669A (en) * 1948-12-27 1951-05-01 American Steel & Wire Co Flexible conduit
US2550670A (en) * 1948-12-27 1951-05-01 American Steel & Wire Co Flexible conduit
US2736957A (en) * 1951-03-08 1956-03-06 Siemens Ag Manufacture of copper wire for varnish-insulated wires
US2770014A (en) * 1953-08-25 1956-11-13 Itt Sizing of thermoplastic cable cores
US2885777A (en) * 1955-02-08 1959-05-12 Western Electric Co Methods of and apparatus for coating articles
US2867848A (en) * 1956-11-23 1959-01-13 Phillips Petroleum Co Heat-stress cracking resistance of thermoplastic filamentous articles
US3076262A (en) * 1957-10-21 1963-02-05 John T Riddell Inc Method of making a metal reinforced resinous structure
US3087240A (en) * 1958-09-29 1963-04-30 Texas Instruments Inc Method of making ceramic-to-metal composite stock
US3141227A (en) * 1958-09-29 1964-07-21 Gen Electric Method of nuclear fuel and control element fabrication
US3218693A (en) * 1962-07-03 1965-11-23 Nat Res Corp Process of making niobium stannide superconductors
US3312773A (en) * 1965-08-23 1967-04-04 Gen Electric Insulated electric conductor and method of making the same
US3348183A (en) * 1966-05-02 1967-10-17 Gen Electric Electrical coils and methods for producing same
US3648506A (en) * 1970-02-16 1972-03-14 Gen Electric Apparatus and method for winding electrical coils
US3811311A (en) * 1972-04-07 1974-05-21 Anaconda Co Making flat copper-clad steel wire
US4207427A (en) * 1977-03-16 1980-06-10 Industrie Pirelli S.P.A. Electrical power cable with stranded insulated wires
US5396212A (en) * 1992-04-27 1995-03-07 Cooper Industries, Inc. Transformer winding
US20030074918A1 (en) * 2001-10-19 2003-04-24 Giuseppe Disegna Method of making jewellery goods and wearable multicolor ornamental articles manufactured with such products
US20040055352A1 (en) * 2002-08-13 2004-03-25 Nexans Method of continuous production of metal wires
US6886385B2 (en) * 2002-08-13 2005-05-03 Nexans Method of continuous production of metal wires
US7628647B2 (en) * 2006-10-23 2009-12-08 Sumitomo Electric Industries, Ltd. Coaxial cable and method for manufacturing the same
US20080139046A1 (en) * 2006-10-23 2008-06-12 Hiroyuki Semba Coaxial cable and method for manufacturing the same
US8826945B1 (en) 2006-12-01 2014-09-09 Thomas M. Clerkin Apparatus and method for forming wire
US20110061894A1 (en) * 2006-12-01 2011-03-17 Clerkin Thomas M Apparatus and method for forming wire
US7617847B1 (en) 2006-12-01 2009-11-17 Clerkin Thomas M Apparatus and method for forming wire
US20140374135A1 (en) * 2012-03-14 2014-12-25 Yazaki Corporation Coaxial electric wire and method for manufacturing the same
US9396845B2 (en) * 2012-03-14 2016-07-19 Yazaki Corporation Coaxial electric wire and method for manufacturing the same
CN104575862A (zh) * 2013-10-21 2015-04-29 雷米技术有限公司 使绝缘导体成形和退火的方法
WO2015061211A1 (fr) * 2013-10-21 2015-04-30 Remy Technologies, L.L.C. Procédé de formage et de recuit d'un conducteur isolé
US9887607B2 (en) * 2013-10-21 2018-02-06 Borgwarner Inc. Method for forming and annealing an insulated conductor
CN104575862B (zh) * 2013-10-21 2019-02-15 雷米技术有限公司 使绝缘导体成形和退火的方法
US20150206626A1 (en) * 2014-01-17 2015-07-23 Unimac Ltd. Insulated wire
US20150206627A1 (en) * 2014-01-17 2015-07-23 Unimac Ltd. Insulated wire
US9601238B2 (en) * 2014-01-17 2017-03-21 Denso Corporation Insulated wire
US9607736B2 (en) * 2014-01-17 2017-03-28 Denso Corporation Insulated wire

Also Published As

Publication number Publication date
FR51240E (fr) 1941-12-20
GB540203A (en) 1941-10-08
FR857432A (fr) 1940-09-13

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