US3710756A - Apparatus for enameling wire - Google Patents

Apparatus for enameling wire Download PDF

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Publication number
US3710756A
US3710756A US00046791A US3710756DA US3710756A US 3710756 A US3710756 A US 3710756A US 00046791 A US00046791 A US 00046791A US 3710756D A US3710756D A US 3710756DA US 3710756 A US3710756 A US 3710756A
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US
United States
Prior art keywords
wire
oven
applicator
enamel
solvent
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
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US00046791A
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English (en)
Inventor
R Goyffon
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.)
PLCV Ltd
MAFIT MANUFACTURE DE FILS ISOL
SOC MAFIT MANUFACTURE DE FILS ISOLES TAURUS FR
Original Assignee
MAFIT MANUFACTURE DE FILS ISOL
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Assigned to PLCV LIMITED reassignment PLCV LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GENERAL ENGINEERING RADCLIFFE LIMITED
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    • 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
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/20—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wires
    • 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
    • H01B13/065—Insulating conductors with lacquers or enamels

Definitions

  • Wire enamellng apparatus includes seriatum a prelimi- [52] U S Cl 118/61 118/65 118/405 nary heater, an enameling means, means to recover [51] h 11/00 and burn solvent vapor evaporating from the ne'n nan-:1:11112111131118818884 65 405: eeemelee we end ee Meeneeeiee the wire in a plurality of passes through the enameling and coating means. Means utilize the combustion products for heating within the system.
  • the invention relates to an apparatus for the continuous coating, in particular the enameling of wires, especially electric wires.
  • the wire is passed in a continuous manner through an applicator device for the coating of enamel (varnish, etc.) and through an oven for the drying and the polymerization of the coated layer.
  • Prior processes and apparatus for this purpose evaporate the solvent from the enamel by heat flowing from the exterior towards the center of the coated wire.
  • the apparatus according to the invention is characterized by the fact that the wires are hot when they first arrive at the'applicator device, and that the evaporation of the solvent takesplace, for a major part, on the path of the wires outside the oven, by the flow of heat from the wire towards the exterior.
  • the apparatus includes preferably, a closed casing containing the enamel bath and the various die'blocks fed by this bath, according to the features of my U.S. Pat. No. 3,412,709 granted Nov. 26, 1968.
  • FIG. 1 illustrates in schematic perspective an enameling apparatus according to a known process
  • FIG. 2 illustrates in section the conditions of heat flow in the wire inside the oven during the drying of the enamel in the known process of FIG. 1;
  • FIG. 3 shows, in a view similar to FIG. 1, an embodiment of an apparatus accordingto the present inven-- tion for performing the process according to the invention
  • FIG. 4 is a partial section through the oven of the embodiment shown in FIG. 3;
  • FIG. 5 shows, in a view similarto FIG. 2,. the conditions of heat flow -in the wire during the drying of the enamel in the process according to the invention, outside the oven;
  • FIG. 6 shows, in a view similarto FIG. 3, part of a modification of the apparatus shown in FIG. 3;
  • FIG. 7 shows, schematically, other parts of the apparatus of FIG. 6.
  • the apparatus according to the invention is charac In this process, the wire 1 (FIG. 1), is displaced along a continuous path forming several passes. This wire is passed successively through the die blocs 2, generally freely open, of an applicator 3, and successive passes are separated from each other by other passes, in one direction and then in the other, through an oven 4.
  • the wire enters at A and leaves at B, after passing around at least 2 rollers 5 and 6 (which can have grooves for the passage of the wires).
  • the wire to be coated when it arrives at the inlet in the applicator 3, is
  • the temperature of the wire at the inlet of the second die block 2 is arranged to remain moderate by cooling the wire between the oven and the applicator. This necessitates in particular that the speed of displacement of the wire must remain rather low.
  • the wire is maintained hot outside the oven, that is, at a temperature hereinafter called drying temperature comprised between the temperature of the enamel when applied and the polymerization temperature of the enamel.
  • drying temperature comprised between the temperature of the enamel when applied and the polymerization temperature of the enamel.
  • the temperature of the wire be between the two limits just mentioned. In fact, if it were less than the lower limit, the exchange of heat during evaporation would take place from the exterior towards the interior as in the prior art processes. If, on
  • the role of the oven can be reduced to polymerization, the heat acting on the enamel from which the solvent is already evaporated, which leads to the absence of cracks, an on .the other hand, a higher speed can be used, since it is no longer necessary to cool the wire before its arrival at the die blocks 2.
  • the portions of the wire outside the oven can be maintained at temperatures of the order of 120 to 150C, whereas the applicator itself is, for example, at a temperature of the order of 50C and preferably under pressure.
  • the speed of translation of the wire which can reach values of the order of 700 meters/min, even 900 meters/min (in particular for 9/ 100 mm wire), instead of about 80 meters/min in the existing processes.
  • FIG. 5 shows the manner in which the thermal exchange takes place in the portions of the wire outside the oven: these portions are hotter than their surroundings, so that the thermal exchange takes place towards the exterior of the wire, assuring the free evaporation of the solvent.
  • this evaporation can take place in free air, by using, for example, a fume hood, or any sort of tunnel comprising suction means, placed in front of the polymerization oven andcompletely independent of this oven. 5
  • FIG. 6 there is shown a modification of the apparatus described above and illustrated by FIG. 3, this modification including a fume hood l-I provided with an evacuation chimney C.
  • the arrangement shown in FIG. 7 can be used, which permits the recovery of the calories from the solvent vapor by subjecting this vapor to catalytic combustion.
  • This apparatus comprises, first of all, a suction device or fan 20 which, through the fume hood H, sucks the solvent vapor at the outlet of the applicator 3, and directs this vapor to a heat-exchanger 21 where it is re-heated, and then through a conduit 22 towards a combustion chamber 23 in which its temperature is first of all raised by heating means such as resistances 24, before the vapor passes to the catalytic combustion device 25.
  • a suction device or fan 20 which, through the fume hood H, sucks the solvent vapor at the outlet of the applicator 3, and directs this vapor to a heat-exchanger 21 where it is re-heated, and then through a conduit 22 towards a combustion chamber 23 in which its temperature is first of all raised by heating means such as resistances 24, before the vapor passes to the catalytic combustion device 25.
  • the burnt gas is sucked by a fan 26 and a first part (the larger part) is directed through the conduit 27 towards the polymerization oven 4, whereas the other part is rejected through a conduit 28 to the free air, after having served for the re-heating of the solvent vapor in the exchanger 21.
  • the part of the burnt gas which is directed towards the polymerization oven follows the path indicated by arrows inside thisoven (the oven operates, as can be seen, by radiation and by convection) and returns through a conduit 29 towards the combustion chamber 23, after mixing with the solvent vapor coming from the exchanger 21.
  • the entire length of the oven remains available or the polymerization. Moreover, it is then possible to increase the temperature in the oven as much as the construction of the oven permits. The speed of enameling will then be adapted to this temperature so that, finally, the enamel will reach the ideal temperature of polymerization. The distance between the applicator of the oven will-be sufficient to permit the evaporation of the solvent before the wire penetrates into the heating tunnel. Experience has shown that this distance can be small.
  • the process according to the invention permits the use of enamel having a high percentage of dry extract.
  • the quantity of the solvent to be evaporated will thus be reduced, and accordingly, the distance between the applicator and the polymerization oven can also be reduced.
  • a percentage of dry extract of the order of 60 percent of the original total of enamel and solvent can be attained.
  • the solvent may be a liquid vehicle in which the enamel or enamel-forming component is carried in suspension rather than in solution.
  • Apparatus for continuously enamelling wire comprising: wire feeding means arranged to move the wire axially of itself,
  • an applicator positioned downstream of said heating means and comprising a closed container adapted to contain enamel including a solvent,
  • said feeding means being adapted to feed said wire first through said heating means, and then successively through said applicator and said oven,
  • said heating means being adapted to heat the wire as it passes therethrough, to a drying temperature between the temperature of the enamel at the time of its application and the temperature of polymerization of the enamel, said applicator being arranged to apply a coating of said enamel to said wire at said drying temperature as said heated wire passes through said applicator, means for ensuring that the solvent in said coating is evaporated by flow of heat from the wire to the exterior, said oven being spaced sufficiently far from said applicator to allow at least a major portion of.
  • the solvent to evaporate from the coating before the wire passes into the oven, and said oven being further adapted to polymerize the enamel in the coating as the wire passes through the oven,
  • a fume-hood mounted between said applicator and said oven for'evacuating the solvent vapor as said solvent evaporates from the enamel coating
  • a heat exchanger connected to said fume-hood and adapted to receive and to heat the solvent vapor coming from said fume-hood
  • catalytic combustion means connected to said heat exchanger and adapted to receive and to burn said heated solvent vapor coming from said heat exchanger, thereby producing hot gas as a combustion product

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Manufacturing & Machinery (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
  • Coating Apparatus (AREA)
US00046791A 1966-08-22 1970-06-16 Apparatus for enameling wire Expired - Lifetime US3710756A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR73791A FR1496780A (fr) 1966-08-22 1966-08-22 Perfectionnements apportés aux procédés et installations pour l'émaillage continu des fils, notamment des conducteurs métalliques

Publications (1)

Publication Number Publication Date
US3710756A true US3710756A (en) 1973-01-16

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ID=8615761

Family Applications (1)

Application Number Title Priority Date Filing Date
US00046791A Expired - Lifetime US3710756A (en) 1966-08-22 1970-06-16 Apparatus for enameling wire

Country Status (6)

Country Link
US (1) US3710756A (fr)
JP (1) JPS5342777B1 (fr)
AT (1) AT291368B (fr)
DE (1) DE1652395C3 (fr)
FR (1) FR1496780A (fr)
GB (1) GB1206410A (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022933A (en) * 1975-08-22 1977-05-10 Bicc Ltd. Wire enamelling machinery and the use thereof
US4365790A (en) * 1981-05-19 1982-12-28 Mag Maschinen Und Apparatebau Gesellschaft Mbh Plant for producing enameled wire using an inline process
US5134787A (en) * 1990-06-06 1992-08-04 Heron Technologies, Inc. Catalytic dryer
CN101789290A (zh) * 2010-04-23 2010-07-28 温州瑞正电工器材有限公司 240级特微细漆包线的制作方法
CN102142307A (zh) * 2011-02-12 2011-08-03 苏州市新的电工有限公司 一种改变细线模具牵引轮倾斜度提高稼动率的设备
CN102175535A (zh) * 2011-02-12 2011-09-07 苏州市新的电工有限公司 一种确定直径小于0.2mm漆包线模具牵引轮倾斜度的方法
US20140216340A1 (en) * 2010-04-08 2014-08-07 Furukawa Electric Co., Ltd. Method and apparatus for producing insulated wire

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3741328A1 (de) * 1987-12-03 1989-06-15 Lackdraht Union Gmbh Verfahren zur herstellung eines lackdrahtes und vorrichtung zur durchfuehrung des verfahrens
IT1224032B (it) * 1988-12-23 1990-09-26 S I C M E Spa Societa Ind Cost Procedimento per ottenere la cottura di manufatti filiformi rivestiti di resine plastiche isolanti e forno per realizzare il suddetto procedimento
DE59204852D1 (de) * 1992-03-31 1996-02-08 Mag Masch App Drahteinziehvorrichtung
CN111804504B (zh) * 2020-05-29 2021-12-31 中国船舶重工集团公司第七0七研究所 一种基于毛细作用的光纤环圈制作用在线施胶装置
CN112934610B (zh) * 2021-01-29 2022-10-25 重庆市九龙橡胶制品制造有限公司 轮胎用钢丝上胶结构

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1829290A (en) * 1929-06-05 1931-10-27 Josiah L Merrill Electric kiln
US1870990A (en) * 1930-02-24 1932-08-09 Simplex Wire & Cable Co Insulation of wire
US2215996A (en) * 1937-08-31 1940-09-24 Gen Electric Method of electrically insulating a conductor
US2889806A (en) * 1955-09-26 1959-06-09 Marcote Company Apparatus for coating fibrous sheets
US2943598A (en) * 1956-10-08 1960-07-05 Gen Electric Wire coating apparatus
US3265033A (en) * 1960-10-13 1966-08-09 Thomson Houston Comp Francaise Wire enamelling furnaces
US3369922A (en) * 1966-08-09 1968-02-20 Joseph G. Svrchek Method for applying heat reactive coatings

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1829290A (en) * 1929-06-05 1931-10-27 Josiah L Merrill Electric kiln
US1870990A (en) * 1930-02-24 1932-08-09 Simplex Wire & Cable Co Insulation of wire
US2215996A (en) * 1937-08-31 1940-09-24 Gen Electric Method of electrically insulating a conductor
US2889806A (en) * 1955-09-26 1959-06-09 Marcote Company Apparatus for coating fibrous sheets
US2943598A (en) * 1956-10-08 1960-07-05 Gen Electric Wire coating apparatus
US3265033A (en) * 1960-10-13 1966-08-09 Thomson Houston Comp Francaise Wire enamelling furnaces
US3369922A (en) * 1966-08-09 1968-02-20 Joseph G. Svrchek Method for applying heat reactive coatings

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022933A (en) * 1975-08-22 1977-05-10 Bicc Ltd. Wire enamelling machinery and the use thereof
US4365790A (en) * 1981-05-19 1982-12-28 Mag Maschinen Und Apparatebau Gesellschaft Mbh Plant for producing enameled wire using an inline process
US5134787A (en) * 1990-06-06 1992-08-04 Heron Technologies, Inc. Catalytic dryer
US20140216340A1 (en) * 2010-04-08 2014-08-07 Furukawa Electric Co., Ltd. Method and apparatus for producing insulated wire
CN101789290A (zh) * 2010-04-23 2010-07-28 温州瑞正电工器材有限公司 240级特微细漆包线的制作方法
CN102142307A (zh) * 2011-02-12 2011-08-03 苏州市新的电工有限公司 一种改变细线模具牵引轮倾斜度提高稼动率的设备
CN102175535A (zh) * 2011-02-12 2011-09-07 苏州市新的电工有限公司 一种确定直径小于0.2mm漆包线模具牵引轮倾斜度的方法
CN102142307B (zh) * 2011-02-12 2012-07-04 苏州市新的电工有限公司 一种改变细线模具牵引轮倾斜度提高稼动率的设备

Also Published As

Publication number Publication date
AT291368B (de) 1971-07-12
DE1652395A1 (de) 1974-01-03
FR1496780A (fr) 1967-10-06
DE1652395C3 (de) 1975-09-18
JPS5342777B1 (fr) 1978-11-14
GB1206410A (en) 1970-09-23
DE1652395B2 (de) 1975-01-30

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Legal Events

Date Code Title Description
AS Assignment

Owner name: PLCV LIMITED, 6 SLOANE SQUARE, LONDON, SW1W 8EE, E

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL ENGINEERING RADCLIFFE LIMITED;REEL/FRAME:004501/0387

Effective date: 19851010