US3412709A - Devices for coating wires and in particular for enamelling electric wires - Google Patents

Devices for coating wires and in particular for enamelling electric wires Download PDF

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Publication number
US3412709A
US3412709A US603512A US60351266A US3412709A US 3412709 A US3412709 A US 3412709A US 603512 A US603512 A US 603512A US 60351266 A US60351266 A US 60351266A US 3412709 A US3412709 A US 3412709A
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United States
Prior art keywords
wires
wire
coating
enamel
enamelling
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Expired - Lifetime
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US603512A
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English (en)
Inventor
Roland A 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.)
Manufacture de Fils Isoles Taurus SA MAFIT
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Manufacture de Fils Isoles Taurus SA MAFIT
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C3/00—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material
    • B05C3/02—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material
    • B05C3/12—Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length

Definitions

  • Wires 1 to be enamelled are passed through an apparatus including a body 12 provided, on the one hand, with a tank 13 through which enamel under pressure is made to circulate continuously and, on the other hand, with housings 16 intended to accommodate die-blocks 17 provided with notches 31 for the passage of the wires therethrough, said body 12 being further provided with a chamber 14 containing felt elements 15.
  • the die blocks 17 are positioned, against the action of springs 16 by a cover 18.
  • Enamel flows continuously through tank 13.
  • the wires 1 to be enamelled pass transversely to tank 13 and to chamber 14 through grooves 21, 22, 23 provided in said body 12.
  • the enamel lea-ks are collected through a groove 35.
  • the cross section of the die block notches 31 is U-shaped, the lower cross section of the U being semi-circular and of a diameter just a little greater than that of the wire, the height of the -U being substantially equal to said first mentioned diameter.
  • the present invention relates to devices for coating wires with a suitable substance and in particular for enamelling electric wires.
  • the object of the invention is to provide an improved devices of this kind and in particular to permit of increasing the speed of enamelling while avoiding too great an evaporation of the enamelling bath.
  • the essential feature of this invention consists in making use of die blocks movably mounted in an apparatus fed with coating liquid and consisting of cylindrical elements engaged in corresponding housings of said apparatus.
  • FIG. 1 diagrammatically shows a plant for enamelling electric wires according to the present invention
  • FIG. 2 is a perspective view of the enamel coating device according to the present invention, the cover plate of this device being shown detached from the body thereof;
  • FIG. 3 is a cross sectional view of the device of FIG. 2, the lid being fitted in position;
  • FIG. 4 is a detail view, showing on an enlarged scale and in vertical section one of the die blocks of the device;
  • FIG. 5 is an elevational view, partly in section, of a device made according to a second embodiment of the invention.
  • FIG. 6 is an end view corresponding to FIG. 5;
  • FIG. 7 is a plane view, with parts cut away, corresponding to FIGS. 5 and 6, and
  • FIG. 8 shows the cover plate of the device of FIGS. 5 to 7, seen from under.
  • roller dies consisting of steel cylinders provided with grooves of triangular cross section for calibrating the enamel or varnish liquid with which the wires are to be coated.
  • Other devices make use of felt elements.
  • roller dies have some drawbacks, due in particular to the necessity of driving said roller dies in rotation and to the d-ifiiculties which result therefrom, in particular for adjusting the roller dies or for replacing them. Furthermore, the triangular shape of the goove cross sections leads to a quick wear and tear thereof due to the action of the spring necessary for maintaining the wire at the bottom of the groove.
  • the wire coating device comprises stationary die blociks having calibrated notches, preferably U-shaped, for the outflow of the coating liquid around the wires, said blocks being mounted removable so that they can be changed very easily, said device being fed in a continuous manner with the coating liquid through a chamber which is closed (with the exception of the passages for the inlet and outlet of the wires), the outflow through said passages returning to the liquid feed means, whereby there is no risk of elevation of the temperature and therefore enamelling can be performed at high rates.
  • U-shaped section permits of limiting leaks and obtaining layers of enamel or varnish of very great accuracy, even when they are very thin.
  • FIG. 1 shows an enamelling plant which comprises: at A a device for applying the enamel through which wires 1, corresponding to several successive steps of the enamelling operation, are pulled by pulling means 60, enamel or varnish arriving at 2 into the apparatus and leaving it at 3,
  • the device for applying the enamel or varnish comprises felt elements and die blocks, the wire passing successively through these two means.
  • the coating device A comprises the following elements:
  • a die block carrying body 12 of elongated parallelepipedal shape containing a longitudinal tank .13 forming a channel for circulation of enamel under pressure, a longitudinal recess 14 for felt elements 15 and housings 16 for receiving the die blocks 17, and
  • a cover plate 18 adapted to fit on the upper face of said body 1 so as to close the recesses thereof and to leave only inlet and outlet passages for wires 1.
  • Body 12 and cover plate 18 are in contact with each other through fluidtight plane surfaces, but there is provided in cover plate 18, to complete the recesses of body 12 and to permit the passage of the Wires, recesses 19 and 20- located opposite tank .13 and recess 14.
  • Grooves are provided in body 12 at 21, 22, 23 for the passage of the wires and above grooves 22 and 23 the cover plate is also provided with grooves 24 and 25 adapted to cooperate with notches 22 and 23, respectively.
  • the felt elements 15 are housed in recesses 14 and 20.
  • Housings 16 and die blocks 17 are of cylindrical shape and springs 26 are interposed between the bottoms of housings 16 and the die blocks to push said die blocks against the cover plate 18. Said cover plate 18 is secured to body 12 by screws such as 27.
  • die blocks 17 have a perfectly plane upper face 28 against which is to be applied the under face 29 of cover plate 18, which is also perfectly plane.
  • a channel 30 provided with a notch 31 for the passage of the wire, said notch being in the form of a U, the lower portion of said notch 31 being of semicylindrical shape, with a diameter equal to the sum of the diameter of the wire 1 passing therethrough and of the thickness of the layer of enamel to be formed on said wire, the upper ortion of notch 31 being limited by two straight surfaces at a distance from each other equal to the notch lower portion diameter and the total height of the notch being equal to said last mentioned diameter.
  • This U-shaped section is the most favorable one for reducing to a minimum the amount of enamel permitted to leak out and for inserting the wires to be enamelled into the die blocks.
  • FIG. 2 shows that, cover plate 18 being lifted and die blocks 17 being in po ition, it is very easy to insert the wires to be coated with enamel or varnish, after which cover plate 18 is lowered and fixed on body 12.
  • Die blocks 17 are provided with positioning pins 32 adapted to engage in vertical slots 33 of body 12, whereby channels 30 are correctly positioned with respect to grooves 21.
  • the bottom of housings 12 is closed by a plate 34 which is removable to permit access to said housings (FIG. 3).
  • Enamel arrives through a conduit 36 leading to tank 13, whereas the outflow of said enamel takes place freely through a passage 37, channel 38 and an outlet conduit 39. It is therefore possible at any time, by adjustment of pump C or through any other suitable means, to have in tank 13 a given pressure indicated by pressure gauge 10 (FIG. l). In order to adjust this pressure as exactly as possible, an air separator 40 (FIG. 1) may be provided.
  • This pressure being determined, it controls accurately the amount of enamel carried along by the wire 1 passing through the notch 31 of every .die block.
  • every wire 1 enters through a groove 23, passes between felt elements 15 impregnated with enamel, is coated with enamel in tank 13 and passes out through notch 31, the amount of enamel adhering to said wire being accurately calibrated.
  • the wire then passes through a polymerization oven and, if necessary, comes back to the device for another coating operation to pass through the next die block, of suitable size, and
  • the device comprises means for returning the liquid to the feed circuit, of avoiding any heating of the enamel, and therefore any evaporation,
  • the speed of 600 meters per minute which is much higher than that generally used, is not at all a limit speed. It corresponds to the obtainment of an excellent wire when some factors are imposed, for instance the temperature of the polymerization oven.
  • FIGS. 5 to 8 there are no felt elements to oppose enamel leakage at the inlets of the wires. But two sets of die blocks are provided, respectively at 17 and 17
  • the tank of FIGS. 2 to 4 is in this case replaced by feed channels 41, 42 provided in the cover plate and disposed above the die blocks.
  • the inflow of the liquid takes place through a feed conduit 43 communicating through a vertical passage 46 with channel 42.
  • the liquid flows through grooves 22 into channel 41 leading through vertical passage 47 to return channel 44.
  • Grooves 22 serve both to the passage of the wires therethrough and to the flow of the liquid from channel 42 to channel 41.
  • the wire is therefore located in a stream of liquid flowing in the same direction as said wire is travelling. This is very important for very fine wires (of a diameter lower than 8/ 100 mm.) which can withstand only low pulling stresses.
  • the inlet die blocks 17 serve merely to limit the outflow of liquid but their resistance to the travel of the wire is lower than in systems making use of felt pieces.
  • the outlet die block 17 is, on the contrary, a calibrating die block.
  • Channel 42 may have, as shown, by FIG. 5 a cross section decreasing from the left toward the right so as to compensate for the decrease of volume of the liquid in circulation, thus maintaining a constant pressure (and therefore a constant flow rate) in each of the grooves 22.
  • the cross section of channel 41 is increasing from the left to the right.
  • a conduit 45 evacuates the amounts of liquid that have leaked out into gutter 35.
  • Conduit 45 is in communication with the collecting gutter through a hollow bolt 48, 49 communicating with a passage 50 provided in an angle of body 12.
  • the U-shaped notches might be used in the case of movable die blocks.
  • a wire coating device which comprises, in combination:
  • a body including a fluidtig-ht cover, forming at least one channel for the continuous flow therethrough, in a given direction, of a coating substance in the liquid state, said body having opposed walls extending in said direction, said walls being provided with respective wire passages locate opposite each other,
  • a wire coating device which comprises, in combination,
  • a body including a fluidtight cover, forming at least one channel for the continuous flow therethrough in a given direction of a coating substance in the liquid state, said body having opposed walls extending in said direction, said walls being provided with respective wire passages located opposite each other,
  • the wall of said body containing said outlet passages having an upper edge co-operating with the inner face of said cover, said last mentioned wall being provided with a cylindrical housing transverse to the direction of said wire and opening into said upper edge,
  • cylindrical block removably mounted in said housing and slidable in said housing, said cylindrical block having a flat end face portion adapted to fit in a fluidtight manner against a corresponding flat inner face portion of said cover,
  • said cylindrical block being provided at its top, ad-
  • a device wherein said notch is U-shaped the bottom portion of said U-shaped notch being of semi-circular cross section of a diameter equal to the sum of the diameter of said wire and of the desired thickness of said liquid coating and the top portion of said notch being of a cross section limited by two parallel straight lines tangent to the ends of said semi-circular cross section, whereas, the depth of said U-shaped notch is equal to the diameter of the semi-circular bottom portion thereof.
  • a device including means for constantly placing the liquid in said tank under pressure.
  • a device wherein the means for opposing outflow of the coating liquid through said inlet passages consist of felt elements located on opposite sides of the wire and held tightly against said wire, said felt elements being housed in said body on the other side of said inlet passage from said tank.
  • a device wherein the means for opposing outflow of the coating liquid through said inlet passages consist of a cylindrical block slidable in a cylindrical housing of the wall of said body containing said inlet passages, said last mentioned block being resiliently urged against the inner face of said cover, said last mentioned cylindrical block being provided, at the end thereof where it is applied against said cover inner face, with a U-shaped notch the bottom portion of which is, in a direction transverse to said wire, of semi-circular cross section of a diameter substantially equal to the diameter of said wire and the top portion of which is of a cross section limited by two straight lines tangent to the ends of said semi-circular cross section, whereas the depth of said last mentioned U-shaped notch is equal to the diameter of the semi-circular bottom portion thereof.
  • a device wherein there are two channels for the flow of said coating substance, said channels being provided in the inner face of said cover, said body being provided with grooves extending between said channels and serving for the passage of the wire and also to the flow of the liquid coating substance from one of said channels to the other.

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  • Coating Apparatus (AREA)
  • Processes Specially Adapted For Manufacturing Cables (AREA)
US603512A 1966-01-07 1966-12-21 Devices for coating wires and in particular for enamelling electric wires Expired - Lifetime US3412709A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR45190A FR1475727A (fr) 1966-01-07 1966-01-07 Perfectionnements apportés aux installations pour l'enduction, notamment l'émaillage des fils

Publications (1)

Publication Number Publication Date
US3412709A true US3412709A (en) 1968-11-26

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US603512A Expired - Lifetime US3412709A (en) 1966-01-07 1966-12-21 Devices for coating wires and in particular for enamelling electric wires

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US (1) US3412709A (de)
AT (1) AT272430B (de)
DE (1) DE1577867B2 (de)
FR (1) FR1475727A (de)
GB (1) GB1148808A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3589333A (en) * 1967-05-02 1971-06-29 Nat Distillers Chem Corp Apparatus for coating elongated filament with plastic
US4022933A (en) * 1975-08-22 1977-05-10 Bicc Ltd. Wire enamelling machinery and the use thereof
US4258646A (en) * 1979-09-20 1981-03-31 W. R. Grace & Co. Pressurized wire enamel applicator cell
US4601918A (en) * 1985-08-27 1986-07-22 Essex Group, Inc. Apparatus and method for applying high solids enamels to wire
US4604300A (en) * 1985-04-03 1986-08-05 Essex Group, Inc. Method for applying high solids enamels to magnet wire
US7718251B2 (en) 2006-03-10 2010-05-18 Amesbury Group, Inc. Systems and methods for manufacturing reinforced weatherstrip
US20170341274A1 (en) * 2014-12-22 2017-11-30 Compagnie Generale Des Etablissements Michelin Device and method for coating a thread
US20180236581A1 (en) * 2017-02-21 2018-08-23 Abbott Cardiovascular Systems Inc. Method for selectively pretinning a guidewire core
US10329834B2 (en) 2015-02-13 2019-06-25 Amesbury Group, Inc. Low compression-force TPE weatherseals

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3521228A1 (de) * 1985-06-13 1986-12-18 Basf Ag, 6700 Ludwigshafen Verfahren und vorrichtung zur kontinuierlichen herstellung von halbzeug aus faserverstaerkten kunststoffen
AT9324U1 (de) * 2006-04-18 2007-08-15 Nhkm Consulting Gmbh Vorrichtung zum auftragen von lack auf ein linearelement

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1049170A (en) * 1910-12-27 1912-12-31 Harry P Thomas Device for applying a lubricant or filler to cables.
US2007441A (en) * 1932-11-19 1935-07-09 Candy & Company Inc Wire coating apparatus
US2280415A (en) * 1938-10-31 1942-04-21 Rotalac Ltd Apparatus for the coating of wires, cables, textile threads, and strips

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1049170A (en) * 1910-12-27 1912-12-31 Harry P Thomas Device for applying a lubricant or filler to cables.
US2007441A (en) * 1932-11-19 1935-07-09 Candy & Company Inc Wire coating apparatus
US2280415A (en) * 1938-10-31 1942-04-21 Rotalac Ltd Apparatus for the coating of wires, cables, textile threads, and strips

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3589333A (en) * 1967-05-02 1971-06-29 Nat Distillers Chem Corp Apparatus for coating elongated filament with plastic
US4022933A (en) * 1975-08-22 1977-05-10 Bicc Ltd. Wire enamelling machinery and the use thereof
US4258646A (en) * 1979-09-20 1981-03-31 W. R. Grace & Co. Pressurized wire enamel applicator cell
US4604300A (en) * 1985-04-03 1986-08-05 Essex Group, Inc. Method for applying high solids enamels to magnet wire
US4601918A (en) * 1985-08-27 1986-07-22 Essex Group, Inc. Apparatus and method for applying high solids enamels to wire
US9358716B2 (en) 2006-03-10 2016-06-07 Amesbury Group, Inc. Systems and methods for manufacturing reinforced weatherstrip
US7718251B2 (en) 2006-03-10 2010-05-18 Amesbury Group, Inc. Systems and methods for manufacturing reinforced weatherstrip
US10265900B2 (en) 2006-03-10 2019-04-23 Amesbury Group, Inc. Systems and methods for manufacturing reinforced weatherstrip
US20170341274A1 (en) * 2014-12-22 2017-11-30 Compagnie Generale Des Etablissements Michelin Device and method for coating a thread
US10329834B2 (en) 2015-02-13 2019-06-25 Amesbury Group, Inc. Low compression-force TPE weatherseals
US10676985B2 (en) 2015-02-13 2020-06-09 Amesbury Group, Inc. Low compression-force TPE weatherseals
US20180236581A1 (en) * 2017-02-21 2018-08-23 Abbott Cardiovascular Systems Inc. Method for selectively pretinning a guidewire core
US10556287B2 (en) * 2017-02-21 2020-02-11 Abbott Cardiovascular Systems Inc. Method for selectively pretinning a guidewire core

Also Published As

Publication number Publication date
AT272430B (de) 1969-07-10
GB1148808A (en) 1969-04-16
FR1475727A (fr) 1967-04-07
DE1577867A1 (de) 1970-03-05
DE1577867B2 (de) 1976-05-26

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