US3891526A - Method of electrocoating electric wire - Google Patents

Method of electrocoating electric wire Download PDF

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Publication number
US3891526A
US3891526A US114475A US11447571A US3891526A US 3891526 A US3891526 A US 3891526A US 114475 A US114475 A US 114475A US 11447571 A US11447571 A US 11447571A US 3891526 A US3891526 A US 3891526A
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bath
varnish
water
coating
conductor
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Expired - Lifetime
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US114475A
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English (en)
Inventor
Shigeo Masuda
Toshihiko Tanaka
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority claimed from JP1244370A external-priority patent/JPS4843708B1/ja
Priority claimed from JP7264670A external-priority patent/JPS4937412B1/ja
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    • 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
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/44—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes for electrophoretic applications
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/16—Wires; Strips; Foils
    • 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
    • H01B13/16—Insulating conductors or cables by passing through or dipping in a liquid bath; by spraying

Definitions

  • This mvention relates to electric wire with a double 52 us. c1 .1 204/181; 204/181 coating made by Producing a first layer of a water 51 Int. Cl 801k 5/02 Persion varnish y electrophoresis and then a Seoond [58] Field of Search 204/l8l, 300 15c layer of a wateesoluble varnish y electrophoresis with subsequent baking, and a method of manufactur- 56] References Cited ing such wire and an apparatus for the coating.
  • PATENTS cludes also the step of treating the first layer with an organic solvent or a mixture of water and an organic introduced solvent soluble in water between the steps of coating 3:540:990 H970 204" the first layer and the second layer.
  • This invention relates to insulated electric wire made by an electrophoretic coating method, and its manufacturing method and coating apparatus.
  • the appearance of the coating film of the insulated electric wire obtained is glossy and smooth, but the coating has a drawback in that it does not readily satisfy the characteristics required of the electric wire. That is to say, if a water-soluble varnish is applied to a conductor, the electrodeposited film shows a great insulation resistance, so that the coating of a thick film cannot be made.
  • the molecular weight of the resin if the varnish is made soluble in water, and furthermore it may be necessary to introduce into the molecular structure a hydrophilic group such as the carboxyl group, hydroxide group, etc. At the present time such a coating cannot satisfy the characteristics required of electric wire because of its molecular structure.
  • a water dispersion varnish In the case of a water dispersion varnish, it can be applied to any desired thickness, unlike a water-soluble varnish. When it is baked, however, the coating film lacks a glossy appearance and may have cracks, so that it is not suitable for use on magnet wire.
  • the electric wire is produced with a glossy surface when a water dispersion varnish is used by adding to the varnish an organic solvent which dissolves the dispersed resin, or by passing the wire after the electrodeposition coating through an organic solvent which swells and dissolves the electrodeposited resin as taught by French Pat. No. 1,52 l ,454, or by spraying it by means of a spray gun or the like or by passing the wire through the vapor of an organic solvent.
  • An object of this invention is to obtain an excellent insulated electric wire, and, more particularly, to obtain an excellent electric wire with an electrodeposited coating not heretofore obtainable.
  • Another object of this invention is to obtain a method of manufacturing an excellent electric wire with an electrodeposited coating as mentioned above, and to obtain an apparatus therefor.
  • Still another object of this invention is to obtain such a manufacturing method and apparatus as mentioned above which are capable of operation for a long time and are valuable for industrial purposes.
  • FIG. 1 is a diagrammatic view showing an embodiment of this invention.
  • FIG. 2 is a diagrammatic view showing another embodiment of this invention.
  • FIG. 3 is a diagrammatic view showing an embodiment of this invention which is made capable of operation for a long time.
  • the method of this invention represents a success in an effort to combine the aforementioned water dispersion varnish and water-soluble varnish to have them mutually make up for the shortcomings of each other and display their merits only. This success has made it possible to obtain electric wire which has any desired coating film and which provides a surface in good condition.
  • the electrodeposited film (wet film) has electric conductivity. If a water-soluble varnish is electrodeposited, however, the electrodeposited film has a high insulating property (approximately 10" l0 Q'cm).
  • the manufacturing method of this invention is made by combining such properties of the two.
  • magnet wire having a desired film thickness and a good surface condition is obtained by first electrodepositing a water dispersion varnish on a conductor and then overcoating it with a water-soluble varnish.
  • the resin used for the overcoating makes up for the defects of the film of the water dispersion varnish used for the undercoating.
  • the problems of luster, cracks, etc., of the film made of a water dispersion varnish are solved in this way.
  • Insulated electric wire having desired special advantages can be obtained by suitably selecting the material for the water-soluble varnish used for the overcoating.
  • insulated electric wire having great resistance to wear, insulated electric wire having excellent resistance to solvents and chemicals, etc. may be obtained.
  • water-soluble varnish a varnish produced by dissolving in water a resin whose principal component is alkyd, polyester, melaminester, acryl ester, epoxy ester, acrylonitrile, etc.
  • water is the principal solvent used for such water-soluble varnish
  • an organic solvent miscible with water may also be used.
  • organic solvents are, for example N, N- dimethylacetamide, N, N-dimethylformamide, N-methyl-2-pyrolidon, etc.
  • concentration of the resin in water-soluble varnish used for the overcoating may be I 40 percent, but is preferably about 5 15 percent.
  • a resin whose principal component is acrylonitrile, polyethylene, polytetrafluoroethylene, trifluoride resin, polyurethane, epoxy-polyamide, styrene-butadien copolymer, styrene-acrylonitrile copolymer, vinyl ether, acetateethylene copolymer or acrylic acid ester resins of various kinds is dispersed in water.
  • an emulsifier, catalyst, etc. may be used.
  • Lectone (a trade name) made by DuPont, a water dispersion of acrylonitrile made by Nitto Denko Kabushiki Kaisha, etc., are used.
  • the resins on these water soluble varnishes and water dispersion varnishes are generally charged or ionized negative, but not always negative. Some of them may be charged or ionized positive.
  • the var nishes to be used for the coating according to this invention there are four possible combinations from the electrical application. That is to say, there are the four possible cases where both the water dispersion varnish and watersoluble varnish are positive, where both of them are negative, where the water dispersion varnish is positive and the watersoluble varnish is negative and where the water dispersion varnish is negative and the watersoluble varnish is positive.
  • the electrophoretic coating method according to this invention will be explained in further detail. Since a resin is to be electrodeposited further on the resin electrodeposited in the first bath, it is preferable with respect to the apparatus and power source used that the electrophoretic baths are arranged in series and electric circuits connected in series as shown in FIG. I.
  • the electrophoretic baths are provided at least with a varnish control tank and a pump.
  • a varnish is placed which will provide electrodeposited resin having electric conductivity.
  • the power source to be used is a direct current source, and it is preferable that the desired electric current can branch into both baths. It is advisable to insert a variable resistor for this purpose.
  • the varnish in 7 goes back to the electrophoretic bath 8 via the varnish control tank 10 by the action of the pump 11.
  • the conductor which has been coated by electrophoresis in 3 and 8 is baked in the baking furnace l2.
  • l3 denotes the direct current source, and 13-1, 13-2, ammeters for measuring electric currents flowing in the first and the second bath. A desired film thickness will be obtained by controlling the value of these electric current.
  • 13-3 denotes a variable resistor installed for varying the electric currents flowing in A A in order to change the values of these currents as desired.
  • the wiring of the circuits will be as shown in the Figure so that the first bath and the second bath may have circuits in series with respect to the direct current source.
  • the variable resistor is installed on the side where the liquid relative resistance plus the coated film resistance is smaller.
  • FIG. 1 shows an instance where the conductor is positive and the electrodes in the baths are negative, namely an instance where the resin is charged negative. In case the resin is charged positive, it is all right if the conductor is made negative and the electrodes in the baths positive.
  • electric charging may be done by circuits as shown in FIG. 2. That is to say, the electrode 4 provided in the bath 3 and the conductor 1 are connected at the position 13, namely at the position before the entry of the conductor into the bath, to form a circuit, while the electrode 9 provided in the bath 4 and the conductor are connected to form a circuit, both being charged with direct current.
  • the electrode 9 and the conductor there are three ways to connect the electrode 9 and the conductor. One of them is as made at the position 14, as shown in FIG. 2. Since E is generally of a higher voltage than E however, the current which comes from E is liable to flow back toward E, in this case. This is prevented by the installation of a diode 18. Another way is one in which the connection is made at the position 15. In this case there takes place a drawback in that the film formed in the first bath 3 is apt to come off. The third way is one in which the connection is made at the position of the take-up machine 16. In this case, the film coating at the end portion of the conductor is removed when starting the take-up to produce a contact between the conductor and the power source and connect the bared conductor with the power source at that point.
  • a treating bath is provided between the first bath and the second bath.
  • varnish remaining on the film of electrophoretic coating in the first bath is removed to prevent the deterioration of the varnish in the second bath.
  • the film of the coating in the first bath is swollen and wetted by the organic solvent or its mixture with water used as a treating liquid and is given a greater bond with the film coating in the second bath. Insulated electric wire with a double coating which has excellent properties can thus be obtained.
  • the liquid When treating the wet filrn with a liquid, it is preferable to use the liquid at a temperature of about 60 C to make the treatment more effective.
  • FIG. 2 An embodiment of this invention will be explained in detail with reference to the drawing.
  • FIG. 2 An embodiment as shown in FIG. 2 in provided with a treating bath as shown in FIG. 3.
  • Numerals 1 17 refer to the same things in each of the figures.
  • 1 denotes the conductor. 2, 3, 2 make up the first bath, and 7, 8, 7 the second bath. 19, 20, 19 make up the treating bath. They respectively consist of main bodies 3, 8 and and parts 2, 7, and 19 for receiving liquid flowing out through the slits in the walls of the main bodies.
  • 4, 9 denote electodes.
  • 5, 10 and 21 are control tanks respectively, and 6, 11, 22 pumps.
  • E and E denote direct current power sources, and 18 a diode for the prevention of back flow.
  • a water dispersion varnish is put in the first bath 2, 3, 2, and a water soluble varnish is put in the second bath 7, 8, 7.
  • a treating liquid of an organic solvent or a mixture of an organic solvent with water is put in the treating bath 19, 20, 19.
  • the liquid flows through the slits and circulates through the tanks 5, l0, 2] by means of the pumps, so that it is always present in the baths.
  • the conductor 1 enters the first bath 2, 3, 2 where a dispersion varnish is electrodeposited thereon. It then enters the treating bath 19, 20, 19 where treatment is made for the removal of sticking varnish, swelling of the film, etc., and it then enters the second bath 7, 8, 7 where a water soluble varnish is electrodeposited on the coating. lt thereafter enters the baking furnace 12, where baking is done and insulated electric wire with a double coating is obtained.
  • the treating liquid used in this application is water, an organic solvent, or a mixed liquid of water and a water-soluble organic solvent.
  • a watersoluble organic solvent dimethylformamide, dimethylacetamide, pyrolidon, ethyleneglycol, alkylmono-ether or diethyleneglycol, diacetonealcohol, etc., for example, may be used. It is particularly preferable to use an aqueous solution containing 0 30 percent (concentration percent), especially 1 10 percent (concentration percent), of such a substance.
  • Example for Comparison 1 The bath is filled with an acrylonitrile varnish whose main component is water dispersion varnish of acrylonitrile, adjusted to a concentration of 7 percent and a pH of 8.0. Copper wire of a 1 mm diameter is used as the conductor. A voltage is applied between it and a cathode provided in the bath, and the acrylonitrile resin is deposited on the conductor by flowing electric current. The manufacturing conditions and the properties obtained are as shown in the Table.
  • Example of Comparison 2 The bath is filled with a tetrafluoride resin varnish, whose principal component is a water dispersion varnish tetrafluoride resin, adjusted to a concentration of IO percent of a pH of 8.2. Nickel-plated copper wire of a 1 mm diameter is used as the conductor. A voltage is applied between it and a cathode provided in the bath, and tetrafluoride resin is deposited on the conductor by flowing electric current. The manufacturing conditions and the properties obtained are as shown in the Table.
  • Example for Comparison 3 The bath is filled with a polyvinylformal varnish, whose principal component is a water-soluble varnish polyvinylformal, adjusted to a concentration of IO percent and a pH of 7.7. Copper wire of a 1 mm diameter was used as the conductor. A voltage was applied between it and a cathode provided in the bath, and the polyvinylformal was deposited on the conductor.
  • a polyvinylformal varnish whose principal component is a water-soluble varnish polyvinylformal, adjusted to a concentration of IO percent and a pH of 7.7. Copper wire of a 1 mm diameter was used as the conductor. A voltage was applied between it and a cathode provided in the bath, and the polyvinylformal was deposited on the conductor.
  • Example for Comparison 4 The bath is filled with a phenolester water-soluble varnish, whose principal component are water-soluble varnishes bisphenol A and glycol ester, adjusted to a concentration of l0 percent and a pH of 7.8.
  • Copper wire of a 1 mm diameter is used as the conductor. A voltage was applied between it and a cathode provided in the bath, the phenol ester resin was deposited on the conductor.
  • Example for Comparison 5 Embodiment l Using such baths as shown in FIG. 1, the first bath was filled with the acrylonitrile water dispersion varnish used in the Example for Comparison 1, and the second bath with the water-soluble polyvinylformal varnish used in the Example for Comparison 3. Cathodes were provided in the first and second baths, and a voltage was applied between them and the conductor of copper wire I mm in diameter.
  • Embodiment 2 Baths as shown in FIG. 1 were used.
  • the first bath was filled with the acrylonitrile water dispersion varnish used in the Example for Comparison 1 and the second bath with the water-soluble phenol ester varnish used in the Example for Comparison 4.
  • Cathodes were provided in the first bath and the second bath, and a voltage was applied between them and the conductor of copper wire 1 mm in diameter. Since the electric current flowing in the first bath and the electric current flowing in the second bath are different because of the respective specific resistances of the liquids and film resistance, the value of electric current flowing in each bath is controlled by installing a variable as shown in the Figure.
  • Embodiment 3 Baths as shown in FIG. 1 were used.
  • the first bath was filled with the acrylonitrile water.
  • Cathodes were provided in the first and second baths, and a voltage was applied between them and the conductor of copper wire 1 mm in diameter.
  • variable resistor Since the electric current flowing in the first bath and the electric current flowing in the second bath are different becauseof the respective specific resistances of the liquids and film resistance, a variable resistor is used as shown in the Figure in order to control the currents which flow.
  • Embodiment 4 Using baths as shown in FIG. 1, the first bath was filled with the tetrafluoride resin water dispersion varnish used in the Example for Comparison 2 and the second bath with the water-soluble polyvinylformal varnish used in the Example for Comparison 3. Cathodes were provided in the first and second baths and a voltage was applied between them and the conductor of nickel-plated copper wire 1 mm in diameter.
  • the values of the electric currents can be controlled to suit the purpose in mind by installing a variable resistor as shown in the Figure.
  • Embodiment 5 Using baths as shwon in FIG. 1, the first bath was filled with the tetrafluoride resin water dispersion varnish used in the Example for Comparison 2 and the second bath with the water-soluble phenol ester varnish as used in the Example for Comparison 4. Cathodes were provided in the first and second baths, and a voltage was applied between them and the conductor of nickelplated copper wire l mm in diameter.
  • the values of the electric currents are controlled to suit the desired thicknesses of the films by installing a variable resistor as shown in the Figure.
  • Embodiment 6 Using baths as shown in FIG. 1, the first bath was filled with a tetrafluoride water dispersion varnish used in the Example for Comparison 2 and the second bath with the water-soluble methacrylic acid varnish used in the Example for Comparison 5. Cathodes were provided in the first and second baths, and a voltage was applied between them and the conductor of nickelplated copper wire. Since the electric current flowing in the first bath and the electric current flowing in the second bath are different because of the specific resistance of the liquid and the specific resistance of the electrodeposited film, the electric currents flowing can be controlled to suit the desired thicknesses of the films by installing a variable resistor as shown in the Figure.
  • Example of Comparison 6 The device as shown in the drawing was used.
  • the first bath was filled with a water dispersion varnish whose principal component was acrylonitrile, adjusted to a concentration of 10 percent and a pH of 8.0, and a second bath was filled with a water-soluble varnish whose principal component was acrylic acid ester, ad justed to a concentration of 10 percent and a pH of 7.8. None was put in the treating bath.
  • the conductor used was a copper wire having a I mm diameter. Electric current of mA was caused to flow in the first bath and electric current of I50 mA in the second bath. Insulated electric wire with a double coatin g film was obtained by carrying out electrophoresis as mentioned above and then baking was performed.
  • Embodiment 7 With the treating bath in the Example for Comparison 6 filled with water, insulated electric wire with double coating film was manufactured in the otherwise same way as the Example for Comparison 6.
  • the varnish in the second bath did not readilydeteriorate, so that continuous operation for more than 24 hours was possible.
  • the insulated electric wire obtained was glossy and had satisfactory properties.
  • Embodiment 8 With the treating bath in the Example for Comparison 6 filled with 20 percent pyrolidon solution, insulated electric wire with a double coating film was manufactured in the otherwise same way as the Example for Comparison 6. The varnish in the second bath did not readily deteriorate, so that continuous operation for more than 24 hours was possible. The insulated electric wire obtained was glossy and had satisfactory properties.
  • Embodiment 9 With the apparatus shown in the drawing in use, the first bath was filled with water dispersion varnish, whose principal component was acrylonitrile, adjusted to a concentration of percent of a pH of 8.0.
  • the second bath was filled with a water-soluble phenol ester varnish, whose principal components were bisphenol A and glycol ester.
  • the treating bath was filled with 30 percent pyrolidon solution.
  • the electric current flowing in the first bath was 60 mA and that in the second bath 200 mA.
  • Electrophoretic coating was thus made on a conductor of cooper wire 1 mm in diameter and then baking was done to obtain insulated electric wire with a double coating film. In this case continuous operation for more than 24 hours was possible and insulated electric wire with a double coating film having good properties was obtained.
  • the treating bath was filled with 20 percent dimethylformamide.
  • electrophoretic coating was carried out with an electric current of 80 mA flowing in the first bath and 180 mA current in the second bath, and then baking was done. Insulated electric wire with a double coating film having a good appearance and good electric wire properties was thus obtained. Continuous operation of at least 24 hours was possible, the varnish in the second bath not deteriorating.
  • Embodiment l l The first bath was filled with a water dispersion varnish whose principal component was acrylonitrile, adjusted to a concentration of 10 percent and a pH of 8.0, and the second bath was filled with a water dispersion varnish whose principal components were acrylonitrile and acrylic acid ester, adjusted to a concentration of 12 percent and a pH of 7.8.
  • the electric current flowing in the first bath was 65 mA and that in the second bath 45 mA.
  • the conductor used was copper wire 1 mm in diameter. In this case, continuous operation was no longer possible after about 7 hours.
  • a treating bath filled with percent aqueous solution of pyrolidon was provided. with the other conditions being the same. Then it was found possible to continue the operation for more than 24 hours, and the insulated electric wire with a double coating film obtained had satisfactory properties.
  • first bath was filled with a water dispersion varnish 65 whose principal component was polyvinylformal, adjusted to a concentration of l 1 percent and a pH of 8.2, and the second bath was filled with a water-soluble varl.
  • the method of manufacturing insulated electric wire comprising the steps of coating a conductor with a water dispersion varnish by electrophoresis, then treating the film coating with a liquid selected from the group consisting of an organic solvent and a mixed liquid of water and water-soluble organic solvent, and further coating the conductor with a water-soluble varnish coated wire in a treating bath of a liquid selected from the group consisting of an organic solvent, and a mixed liquid of water and a water-soluble organic solvent, and applying a second electrophoretic coating in a second electrophoretic bath.

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US114475A 1970-02-14 1971-02-11 Method of electrocoating electric wire Expired - Lifetime US3891526A (en)

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JP1244370A JPS4843708B1 (enExample) 1970-02-14 1970-02-14
JP7264670A JPS4937412B1 (enExample) 1970-08-19 1970-08-19

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953310A (en) * 1972-09-05 1976-04-27 Dainichi-Nippon Cables, Ltd. Electrocoating process for producing insulated wire
US4025037A (en) * 1973-11-10 1977-05-24 Mitsubishi Denki Kabushiki Kaisha Process for soldering an electrocoated substrate
US4039415A (en) * 1974-06-05 1977-08-02 Mitsubishi Denki Kabushiki Kaisha Process for preparing insulation wire
US4576694A (en) * 1981-05-09 1986-03-18 Mitsubishi Denki Kabushiki Kaisha Method for producing electrically insulated conductor
WO2007118265A1 (de) * 2006-04-18 2007-10-25 Nhkm Consulting Gmbh Vorrichtung zum auftragen von lack auf ein linearelement
CN101944409A (zh) * 2010-07-26 2011-01-12 苏州宝兴电线电缆有限公司 芯线过油控制装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4259163A (en) * 1978-05-11 1981-03-31 Shinto Paint Co., Ltd. Process for applying anticorrosive coating onto automobile body

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865795A (en) * 1951-10-30 1958-12-23 Gen Electric Insulated electrical conductor and method of making the same
US3441489A (en) * 1965-10-22 1969-04-29 Ppg Industries Inc Method for removing gas film formed during electrodeposition
US3540990A (en) * 1966-03-07 1970-11-17 Mitsubishi Electric Corp Electrocoating process
US3547788A (en) * 1967-09-14 1970-12-15 Sumitomo Electric Industries Insulated wire and method of making the same
US3681224A (en) * 1970-05-08 1972-08-01 Textron Inc Electrophoretic coating method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2865795A (en) * 1951-10-30 1958-12-23 Gen Electric Insulated electrical conductor and method of making the same
US3441489A (en) * 1965-10-22 1969-04-29 Ppg Industries Inc Method for removing gas film formed during electrodeposition
US3540990A (en) * 1966-03-07 1970-11-17 Mitsubishi Electric Corp Electrocoating process
US3547788A (en) * 1967-09-14 1970-12-15 Sumitomo Electric Industries Insulated wire and method of making the same
US3681224A (en) * 1970-05-08 1972-08-01 Textron Inc Electrophoretic coating method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3953310A (en) * 1972-09-05 1976-04-27 Dainichi-Nippon Cables, Ltd. Electrocoating process for producing insulated wire
US4025037A (en) * 1973-11-10 1977-05-24 Mitsubishi Denki Kabushiki Kaisha Process for soldering an electrocoated substrate
US4039415A (en) * 1974-06-05 1977-08-02 Mitsubishi Denki Kabushiki Kaisha Process for preparing insulation wire
US4576694A (en) * 1981-05-09 1986-03-18 Mitsubishi Denki Kabushiki Kaisha Method for producing electrically insulated conductor
WO2007118265A1 (de) * 2006-04-18 2007-10-25 Nhkm Consulting Gmbh Vorrichtung zum auftragen von lack auf ein linearelement
CN101944409A (zh) * 2010-07-26 2011-01-12 苏州宝兴电线电缆有限公司 芯线过油控制装置

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FR2079434A1 (enExample) 1971-11-12
DE2106762A1 (de) 1971-09-16
DE2106762C3 (de) 1974-08-22
FR2079434B1 (enExample) 1973-10-19
DE2106762B2 (de) 1974-01-10

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