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Publication numberUS3476081 A
Publication typeGrant
Publication dateNov 4, 1969
Filing dateMar 25, 1964
Priority dateMar 25, 1964
Also published asDE1427661A1, US3560239
Publication numberUS 3476081 A, US 3476081A, US-A-3476081, US3476081 A, US3476081A
InventorsWalter K Facer, Jane H M Rigo
Original AssigneeUnited States Steel Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Fluidizing chamber
US 3476081 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Nov. 4, 1969 w, K. FACER ETAL FLUIDIZING CHAMBER Filed March 25, 1964 & .H mm x 6% k A H mm m E :8 N3 m IIN- give. 25% uaifim EMF x Q Q S Q m Ill/1 I I'II I IHHIHHHHHHHHHHHH OOOOQOOOOOOOOOOOOOO OOOOOOOOOOOOO INVENTORS WALTER k. FACE/i and Y I Af/orney United States Patent 3,476,081 FLUIDKZING CHAMBER Walter K. Facer, Parma, and Jane H. M. Rigo, Cleveland, Ohio, assignors to United States Steel Corporation, a corporation of Delaware Filed Mar. 25, 1964, Ser. No. 354,594 lint. Cl. Bc 3/04, 3/132; F163 /40 US. Cl. 118-620 13 Claims ABSTRACT OF THE DISCLOSURE A fluidized bed coating apparatus adapted to treat a substrate of indefinite length passing horizontally therethrough. Vertically arranged compartmentizing walls in the fluidizing chamber. The chamber being sealed by pressurized air-sealing means, through which the substrate passes and which are secured at either the chamber end walls or at a compartmentizing wall whereby to select an effective length of fluidizing chamber. Fluid mediumdeflecting plates disposed in said chamber and mounted in close proximity to, but above, the sealed openings of the chamber.

This invention relates to an apparatus for coating an elongated body and more particularly to the coating of a steel wire with resin. This type of coating has been applied by various methods and apparatuses. Church Patent No. 3,108,022 dated Oct. 22, 1963, shows one type of apparatus which has been used. However, we have found that this apparatus, like others of which we have knowledge, has various disadvantages. In Church the air used at the seals is not uniformly distributed and will have little fluidizing effect. Also the chamber containing the fluidized bed must be relatively air tight so that there is a problem in charging the resin. We have also discovered when using a fluidized bed of a fixed length that it is diflicult to obtain suitable coatings on wires of different sizes and to vary the thickness of the coating, Difficulty is also encountered in obtaining a suitable primer on the wire before coating.

It is therefore an object of our invention to provide an apparatus for coating an elongated object with resin wherein different size objects can be provided with suitable coatings of various thicknesses.

A further object is to provide such apparatus which need not have an enclosed or air tight top.

A still further object is to provide such apparatus which efficiently utilizes the gas supplied to the fluidized bed.

These and other objects will be more apparent after referring to the following specification and attached drawings, in which:

FIGURE 1 is a schematic view of the coating line of our invention;

FIGURE 2 is a view, partly in section, of the priming unit of our invention;

FIGURE 3 is a view, partly in section, of the coating unit of our invention; and

FIGURE 4 is a sectional view of a detail of the coating unit.

Referring more particularly to the drawings, reference numeral 2 indicates a pay off reel for supporting a coil of wire W to be coated. The wire W passes through standard roll straighteners 3 to a cleaning tank 4 of any suitable type and then through a water rinse tank 6. From here the wire W passes successively through a priming unit 8, drying unit 10, preheat induction coil 12, coating chamber 14, post heat induction coil 16, fusion area 18 and water quench 20 to a take up 22 where it is coiled. While the description will be directed to the coating of wire; strand, cord, rope, strip or like elongated structures may be coated as well with only slight modification.

3,476,081 Patented Nov. 4, 1969 ice The priming unit 8, as shown in FIGURE 2 includes a chamber 24 having a spiraled cord wipe 26 therein through which the wire W passes. A liquid primer is delivered into chamber 24 and directed onto wire W through a conduit 28 and is returned to a reservoir (not shown) through a drain 30. The coating chamber 14 as shown in FIGURES 3 and 4 has end walls 32 and 34 with aligned openings 36 and 38 therein. An entry air seal 40 is supported on the wall 32 and an exit air seal 42 is supported on the wall 34. The seal 40 includes a hollow cylindrical member 44 having an externally threaded reduced diameter portion 46 and a larger diameter portion 48. The portion 46 has an axial opening 50 therethrough which is only slightly larger than the diameter of the wire W. The portion 48 has an opening or chamber 52 therein which is connected to the opening 50 by means of a beveled portion 54which is preferably arranged at an angle of 60 to the-axisof the wire. Threads 56 are provided on the inlet side of opening 52 and a nozzle 58 is threaded into the threads 56. The forward end of nozzle 58 is tapered at the same angle as tapered portion 54. The air seal 40 is attached to the wall 32 by means of a nut 60 threaded on portion 46. A gasket or other sealing member 62 is provided between the portion 48 and the outside of wall 32. The nozzle 58 is threaded into threads 56 an amount such that a conical port 64 is provided for air passage. The size of the opening of port 64 may be varied as desired- A lock nut 66 threaded on the outside of nozzle 58 and bearing against member 44 holds the nozzle in adjusted position. Air is delivered into the chamber 52 through a conduit 68. The air seal 42 has essentially the same construction as air seal 40 and corresponding parts are indicated by priming the reference numerals applied to the parts of air seal 40. The openings through portion 46' and nozzle 58' are substantially larger than the openings through portion 46 and nozzle 58. Air is delivered into chamber 52' at diametrically opposed positions through conduits 70 and 72.

An air diffusion board 74 is arranged a short distance above bottom 76 of the chamber 14. A manifold 78 supported on top of chamber 14 has a chamber 80 around its periphery. Inner walls 82 of the manifold 78 have closely spaced holes 84 therein for a purpose which will appear later. A conduit 86 is connected to the manifold 78 and leads to a suction fan 88. A deflector plate 90 is mounted on each end wall above the air seal and extends downwardly and inwardly. Preferably the plates terminate a short distance from each side of chamber 14. Two vertical partitions 92 are arranged in the chamber 14 intermediate the ends thereof. Each partition 92 includes flanged members 94 around the transverse periphery of chamber 14. The bottom of each flanged member 94 preferably has a downwardly extending flange 95 which divides board 74 into sections. A plate 96 is attached to the member 94 with a sealing member 98 therebetween. Each plate 96 has an opening 100 therethrough which is in alignment with openings 36 and 38. Dividers 102 are provided in plenum chamber 104 formed between the bottom 76 and diffusion board 74. A seal 103 is provided between the top flange of divider 102 and the bottom of boards 74.

Air is delivered into the chamber 104 from an air source (not shown) through air manifold 106 and branch conduits 108, 110 and 112. The conduits 108, 110 and 112 have valves 114, 116 and 118 therein. A removable cover 120 is preferably provided over at least a portion of the top of the manifold 78. Air is delivered along the wire W into the induction coil 12 through an air conduit 122. Valves 124, 126, 128 and 130 control the flow of air through conduits 68, 70 and 72 into the air seals and through the conduit 122.

In operation, wire W is threaded through the line and a granulated resin material 132 is placed in the coating chamber 14. This resin may be thermoplastic or thermosetting. The type of resin does not form any part of the present invention but the following resins have been used: Cellulosic, chlorinated polyether, eposy, nylon, polyester, polyethylene, dry blended vinyl and pre-fused freeze-ground vinyl. Assuming that the wire is of small diameter that a thick coating is to be applied, the exit seal 42 will be attached to the end wall 34 as shown. The line is then started in operation with the valves 114, 116 and 118 being open. As the straightened clean wire passes into chamber 24 liquid primer is directed directly onto the wire W and after partial draining the primer is more uniformly distributed by passage through the wool felt cord 26. At a given speed, primer feed, and wire diameter, the thickness of the primer may be varied by changing the number of wraps of the cord 26 around the wire. The primer materials form no part of the present invention but that sold by Michigan Chrome and Chemical Company as MC1445 primer and that sold by Polymer Processes Incorporated as VC primer have been used. The primer is then dried in the drying unit and the wire W preheated as it passes through induction coil 12. Flow of air through conduit 122 into the coil 12 has been found necessary in order to purge the priming fumes and to keep the coil free of accumulations. Most of the fumes will be driven back into drying chamber 10 by this aid. As the wire W passes through the fluidized bed of powdered resin 132 it picks up a coating of the same. The bed is kept in a fluidized state by means of the air passing through the diffusion board 74 and also by the air passing through the air seals. The deflectors 90 prevent this latter air from rising directly through the bed at each end. Air movement at the end seals prevents dead space in or around the seal so as to prevent agglomeration of the resin at the wire entrance and exit points. The air at the exit seal blows excess powder from the wire and prevents escape of powder from the tank. The wire from the coating chamber 14 passes through the fusion zone 18 where the particles of resin on the wire fuse together and to the wire to obtain a smooth surface. In some instances heat will be supplied to the wire W by means of the induction coil 16. This is done only when additional heat is required on the wire which is most likely to occur with small diameter wires. The fused wire then passes through the water quench 20 and hence to the take-up 22 where it is coiled.

When coating wires of larger diameter it has been found that the length of the fluidized bed should be reduced. This is also true when a thin resin coating is desired or when the wire is passed through the line at slow speeds. When this is done the exit seal 42 and deflector 90 are attached to one of the partitions 92 and the powdered resin is placed only in the space between the seals. Assuming that the seal 42 and deflector 90 are placed on the first of the partitions 92, as shown in broken lines in FIGURE 3, valves 116 and 118 are closed and valve 114 opened. Also the openings 84 between the first partition 92 and the end wall 34 are closed in any suitable manner. This may be done by merely placing adhesive tape thereover. The flange 9S, divider 102 and seal 103 restrict air flow from chamber 104 to the fluidized bed in the first compartment of chamber 14. Fumes and air passing through the openings 84 are drawn through conduit 86 by means of suction fan 88.

We claim:

1. Apparatus for coating a moving elongated object comprising means for moving said object longitudinally, a chamber for containing a powdered resin; means for delivering gas to the bottom of said chamber including exit means in an upper portion thereof for the egress of the fluidizing gas; an opening formed at each end wall of the chamber, horizontally aligned with one another; chamber seal means disposed at each said opening; each seal means comprising an apertured nose portion removably secured at the opening of the associated chamber end wall, said nose portion being formed on an end wall of an enlarged cylindrical chamber which extends outwardly of said fluidizing chamber, the other end wall of said cylindrical chamber including a screw-threaded opening which is in alignment with the aperture through said nose portion, an externally screw-threaded elongated nozzle member extending into said cylindrical chamber and engaged with the screw-threads at the opening in said other end wall whereby said nozzle is axially adjustable for translation to and from the apertured nose portion, the aperture exending through said nozzle being at least as large as and in horizontal alignment with the aperture in said nose portion, said nozzle being of a length whereby the forward end portion thereof is closely spaced from the end of said nose portion which forms a part of the associated cylindrical chamber end wall, pressurized gas feed means communicating with said cylindrical chamber, the aperture of said nose portion being chamfered at the associated end wall, the said nozzle end portion being beveled to complement said chamfered part so as to form a forwardly directed annular slit whereby pressurized gas feed into the cylindrical chamber wall pass through said annular slit in direction toward said fluidizing chamber; the apertures through said nose portions being of a size to closely accommodate the passage of said elongated object therethrough; and a downwardly and inwardly directed deflector plate mounted on each fluidizing chamber end wall, in the proximity of but above the opening therein, whereby to intercept fluidizing medium thereat and inside of said fluidizing chamber.

2. Apparatus according to claim 1 wherein said exit means includes a plurality of openings disposed about the periphery of a top portion of the fluidizing chamber and means for applying suction at said openings.

3. Apparatus according to claim 2 combined with means to preheat said article, said means comprising an induction coil through which the elongated object passes and disposed in the proximity of the entrance seal to the fluidizing chamber; and

means delivering a scavenging gas to said induction coil whereby to inhibit any accumulation thereon.

4. Apparatus according to claim 3 wherein the apertures of the exit seal nose and nozzle parts are slightly larger than the corresponding entrance seal parts whereby to closely accommodate the coated object.

5. Apparatus according to claim 4 wherein said fluidizing chamber is compartmented by at least one vertically extending, apertured wall member;

the aperture in said vertical wall member being in horizontal alignment with the apertures of said seal means; said seal means being removably securable at said aperture of said vertical wall member whereby an effective length of fluidizing chamber may be selected;

said means for delivering fluidizing gas include means for selectively delivering such fluidizing gas to each compartment; and

said vertical wall member including a deflector plate which corresponds to the deflector plates at the fluidizing chamber end walls.

6. Apparatus according to claim 1 wherein said fluidizing chamber is compartmented by at least one vertically extending, apertured wall member;

the aperture in said vertical wall member being in horizontal alignment with the apertures of said seal means; said seal means being removably securable at said aperture of said vertical wall member whereby an effective length of fluidizing chamber may be selected;

said means for delivering fluidizing gas include means for selectively delivering such fluidizing gas to each compartment; and

said vertical wall member including a deflector plate which corresponds to the deflector plates at the fluidizing chamber end walls.

7. Apparatus according to claim 6 wherein the fluidizing chamber is compartmented by a plurality of the said vertical wall member.

-8. Apparatus according to claim 6 wherein the apertures of the exit seal nose and nozzle parts are slightly larger than the corresponding entrance seal parts whereby to closely accommodate the coated objects.

9. Apparatus according to claim 8 wherein said exit means includes a plurality of openings disposed about the periphery of a top portion of the fluidizing chamber and means for applying suction at said openings.

10. Apparatus according to claim 7 combined with means to preheat said article, said means comprising an induction coil through which the elongated object passes and disposed in the proximity of the entrance seal to the fluidizing chamber, and

means delivering a scavenging gas to said induction coil whereby to inhibit any accumulation thereon.

11. Apparatus according to claim 10 combined with means to apply a primer to said object;

means to dry the primer-coated object prior to passage of said object through the means to preheat; and

said means to move being adapted to continuously move the elongated object, seriatim through each of the object treating means.

12. Apparatus for coating a moving elongated object comprising means for moving said object longitudinally; a chamber for containing a powdered resin; means for delivering gas to the bottom of said chamber whereby to fiuidize said powdered resin; said chamber including exit means in an upper portion thereof for the egress of the fluidizing gas; an opening formed at each end wall of the chamber, generally horizontally aligned with one another; chamber seal means disposed at each said opening; each seal means having an aperture therethrough of a size to closely accommodate the passage of said elongated object therethrough and means for feeding pressurized gas into said aperture in a direction toward said fluidizing chamber; and a downwardly and inwardly directed defiector plate mounted on each fluidizing chamber end wall, in the proximity of but above the opening therein, whereby to intercept fluidizing medium thereat and inside of said fluidizing chamber.

13. Apparatus according to claim 12 in which said fluidizing chamber is compartmented by at least one ver tically extending, apertured wall member; the aperture in said vertical wall member being in horizontal alignment with the apertures of said seal means; seal means on said apertured wall member; said seal means being removably securable whereby an effective length of fluidizing chamber may be selected; said means for delivering fluidizing gas include means for selectively delivering such fluidizing gas to each compartment; and said vertical wall member including a deflector plate which corresponds to the deflector plates at the fluidizing chamber end walls.

References Cited UNITED STATES PATENTS 1,595,486 8/1926 Minton.

2,540,006 1/1951 Otto 118-405 X 2,602,959 7/1952 Fenlin 118-405 X 2,750,681 6/1956 Berry.

3,004,861 10/1961 Davis 118-309 X 3,108,022 10/1963 Church 118-404 X 3,199,491 8/1965 Bader 118-405 X 3,208,868 9/1965 Strobel et a1. 117-21 X 3,208,869 9/1965 Starr et a1 118-405 X 3,233,582 2/1966 Sharetts et al. 118-404 3,270,364 9/ 1966 Steele 15306 MORRIS KAPLAN, Primary Examiner US. Cl. X.R.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1595486 *Feb 8, 1922Aug 10, 1926Minton OgdenVelocity air vacuum seal, method and apparatus
US2540006 *May 5, 1948Jan 30, 1951Horace J HeffelfingerMachine for coating metal on metal pipes or tubing
US2602959 *Mar 5, 1948Jul 15, 1952John M FenlinApparatus for making tubular conduits
US2750681 *Apr 16, 1954Jun 19, 1956Berry Francois Jacq BarthelemyFluidising devices
US3004861 *Jan 12, 1956Oct 17, 1961Polymer CorpMethods and apparatus for applying protective coatings
US3108022 *May 9, 1960Oct 22, 1963Polymer Processes IncApparatus for coating an elongate body with fluidized coating material
US3199491 *Mar 20, 1961Aug 10, 1965DegussaApparatus for coating one surface of a strip by a fluid bed sintering procedure
US3208868 *Jan 5, 1961Sep 28, 1965Minnesota Mining & MfgMethod and apparatus for coating articles with particulate material
US3208869 *Jan 16, 1961Sep 28, 1965Jones & Laughlin Steel CorpFluidized coating of pipe
US3233582 *Jan 8, 1962Feb 8, 1966Polymer CorpApparatus for continuous fluidized bed coating of pipe
US3270364 *Aug 12, 1964Sep 6, 1966Steele Maurice GAir wipe device for wire
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3589335 *Sep 22, 1969Jun 29, 1971British Insulated CallendersApparatus for applying powder to elongated article
US3603288 *Nov 29, 1968Sep 7, 1971Anchor Post ProdApparatus for continuous coating of metallic products with fusible pulverulent materials
US4051809 *Sep 22, 1976Oct 4, 1977Westinghouse Electric CorporationApparatus for cleaning and coating an elongated metallic member
US4070503 *Aug 15, 1975Jan 24, 1978S.A., des Cableries & Trefileries de CossonayProcess for continuously coating a metal wire at high velocity
US4102300 *Dec 8, 1976Jul 25, 1978S.A. Des Cableries & Trefileries De CossonayApparatus for continuously coating a metal wire at high velocity
US4606928 *Mar 7, 1985Aug 19, 1986Electrostatic Technology IncorporatedVortex effect electrostatic fluidized bed coating method and apparatus
US4808432 *Aug 18, 1986Feb 28, 1989Electrostatic Technology IncorporatedElectrostatic coating apparatus and method
US5101758 *Aug 24, 1989Apr 7, 1992S. G. Owen (Northampton) LimitedAir knife
Classifications
U.S. Classification118/620, 118/405, 277/431, 277/906, 118/429
International ClassificationB05C19/02
Cooperative ClassificationB05C19/02, Y10S277/906
European ClassificationB05C19/02