US3828729A - Electrostatic fluidized bed - Google Patents

Electrostatic fluidized bed Download PDF

Info

Publication number
US3828729A
US3828729A US00254472A US25447272A US3828729A US 3828729 A US3828729 A US 3828729A US 00254472 A US00254472 A US 00254472A US 25447272 A US25447272 A US 25447272A US 3828729 A US3828729 A US 3828729A
Authority
US
United States
Prior art keywords
travel path
baffle
electrode
edge portion
objects
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
US00254472A
Other languages
English (en)
Inventor
W Goodridge
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.)
ELECTROSTATIC EQUIP CORP
ELECTROSTATIC EQUIPMENT CORP US
ELECTROSTATIC EQUIPMENT CORP
Original Assignee
ELECTROSTATIC EQUIP CORP
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
Application filed by ELECTROSTATIC EQUIP CORP filed Critical ELECTROSTATIC EQUIP CORP
Priority to US00254472A priority Critical patent/US3828729A/en
Priority to CA171,474A priority patent/CA1007115A/en
Priority to GB2333673A priority patent/GB1426517A/en
Priority to JP5374073A priority patent/JPS547026B2/ja
Priority to DE2324803A priority patent/DE2324803C2/de
Priority to US439347A priority patent/US3914461A/en
Priority to US05/454,566 priority patent/US3937179A/en
Application granted granted Critical
Publication of US3828729A publication Critical patent/US3828729A/en
Assigned to ELECTROSTATIC EQUIPMENT CORP. reassignment ELECTROSTATIC EQUIPMENT CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: CANADA WIRE AND CABLE COMPANY LIMITED
Assigned to CITYTRUST, 961 MAIN STREET, BRIDGEPORT, CT reassignment CITYTRUST, 961 MAIN STREET, BRIDGEPORT, CT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ELECTROSTATIC EQUIPMENT CORP.
Assigned to ELECTROSTATIC TECHNOLOGY, INC. reassignment ELECTROSTATIC TECHNOLOGY, INC. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITYTRUST, A CT STATE BANK AND TRUST COMPANY
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • B05C19/00—Apparatus specially adapted for applying particulate materials to surfaces
    • B05C19/02—Apparatus specially adapted for applying particulate materials to surfaces using fluidised-bed techniques
    • B05C19/025—Combined with electrostatic means
    • 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
    • Y10S118/05—Fluidized bed

Definitions

  • Objects are coated in electrostatic fluidized or fluidic bed apparatus which includes a mechanical barrier effectively interposed between the cloud of charged par- [52] U.S. Cl. 118/634, l17/93.41-,1 tides and the travel path for objects conveyed there 51] I t CK G03 13/00 through.
  • the barrier means includes an upstanding d 6 4 R baffle having an edge portion configured to expose 1 0 are 406 4 different vertical portions of the object as it is conveyed thereby.
  • One highly effective and convenient type of apparatus that is used for such coating consists fundamentally of a particle bed fluidizing device equipped with an electrode for producing an electrostatic charge on the particles. Exposure of the object to be coated to the cloud of charged particles so produced, while the former is maintained at an effectively opposite potential (normally grounded), will cause electrostatic attraction and adherence of the particles thereto. The object may then be heated or otherwise treated so as to fuse the particles into a unified surface coating, depending of course upon the nature of the particles and other factors.
  • any particle rises will have a finite value, which will depend upon the physical characteristics of the particle and the potential difference existing between it and the attracting body.
  • the voltages necessary to charge particles sufficiently to cause them to rise to surfaces which are more than a given distance above the bed become prohibitive, from the standpoints of both safety and also satisfactory operation, as a result of which miscoating of the upper portions of many objects would frequently occur under practical operating conditions.
  • the fluidized bed means includes at least a first electrode for producing a cloud of electrostatically charged particles
  • the conveying means is adapted to transport an object along a travel path adjacent the fluidized bed means.
  • the mechanical barrier means is effectively interposed between the fluidized bed means and the travel path, and includes at least a first upstanding baffle which is spaced laterally to one side of the travel path and extends along at least a portion thereof.
  • An edge portion of the baffle is located above the electrode of the fluidized bed, and is adapted to permit particles to pass thereacross from the bed to the travel path; it is configured for horizontal registration with different vertical portions of the object as it passes thereby along the travel path.
  • particles from the bed may be charged effectively opposite to the object to be electrostatically coated in the apparatus, so as to effect electrostatic attraction therebetween.
  • This effect together with that of the baffle, causes particles to be deposited upon the different vertical portions of the object as such portions are exposed behind the baffle during passage of the object thereby.
  • the edge portion of the baffle will be substantially rectilinear, and in one embodiment it may slope downwardly in the forward direction of the travel path, which is, in accordance therewith, substantially horizontally disposed. In another embodiment the edge portion may be substantially horizontal with the travel path of the object disposed at an angle thereto.
  • the edge portion may have a complex configuration con sisting, for example, of a number of rectilinear portions, and it may suitably be provided by the free upper edge of the baffle or by an elongated slot in the baffle extending generally in the direction of the travel path.
  • the barrier means includes a second upstanding baffle which is configured similarly to the first and is spaced laterally therefrom to the opposite side of the travel path.
  • the first and second baffles will be generally transversely aligned with the travel path therebetween, to thereby permit simultan'eo'us coating of two sides of the object conveyed therealong.
  • the travel path and the baffles will usually be substantially rectilinear and will extend generally parallel to one another.
  • the conveying means will, in most instances, have means for mounting a multiplicity of objects thereon for sequential passage along the travel path, and the mounting means may beneficially be adapted to rotate each of the objects about a vertical axis during passage along the travel path.
  • the apparatus hereinbefore described may in addition include means in electrical connection with the conveyor for maintaining it at ground potential, with the mounting means being electrically conductive to effect grounding of objects mounted thereby.
  • the first-mentioned electrode of the apparatus will be substantially planar and disposed generally horizontally in the fluidized bed means.
  • the fluidized bed means will include at least a second electrode which is electrically independent of the first electrode so as to permit first and second zones of different voltage to be established therein.
  • the first electrode may extend along the travel path portion to provide the first zone
  • the second electrode may extend along a second portion of the path outwardly of the first portion to provide the second zone thereat.
  • Such apparatus will be substantially free from obstructions between the second electrode and the second portion of the travel path, so as to facilitate the deposition of charged particles from the second zone upon a bottom portion of the object during passage thereover.
  • a multiplicity of objects will be sequentially passed along the travel path for coating.
  • the travel path extends between two of such baffles, with a cloud of electrostatically charged particles being generated adjacent the outer side of each one thereof to simultaneously contact opposite sides of the object during passage therealong.
  • the operation of the invention may include the step of generating at least a second cloud of particles possessing an electrostatic charge of substantially different magnitude than that of the particles of the first-mentioned cloud. It may also include the step of heating the object subsequent to the deposition of particles thereon, in which instance the particles will be of a heat-fusible material with the heating step thereby producing a fused coating thereof upon the object.
  • an electrostatic fluidized bed unit comprising a substantially closed container having a passageway for transport therethrough of objects depending thereinto.
  • the container has at least a first plenum chamber which extends along one side of the passageway and has an inlet for pressurized air and an upwardly directed opening.
  • a porous plate and an electrode span the opening, and a baffle is interposed between the plenum chamber and the passageway.
  • An upper edge portion of the baffle is spaced above the electrode and is configured for horizontal registration with different vertical portions of the objects as they are passed thereby through the passageway along a predetermined path.
  • a cloud of charged particles of a coating material may be generated above the porous plate and electrode of the plenum chamber, with the particles being electrostatically attracted and deposited upon the different vertical portions of objects charged effectively opposite thereto as such portions are exposed behind the baffle.
  • the container of the fluidic unit has a second plenum chamber substantially identical to the firstmentioned plenum chamber and extending along the opposite side of the passageway therefrom.
  • a unit will additionally include a second porous plate and an electrode spanning the opening of the second chamber, and it will also have a second barrier of substantially identical configuration to the first-mentioned barrier interposed between the second plenum chamber and the passageway.
  • the unit will therefore be adapted to simultaneously coat opposite sides of the objects passed along the passageway with charged particles from clouds generated over both the first and second plenum chambers.
  • Such a unit may in addition include a third plenum chamber located downstream along the travel path from the first and second plenum chambers.
  • the third chamber will also have an upwardly directed opening with a third porous plate and a third electrode spanning thereacross.
  • a third porous plate and a third electrode spanning thereacross.
  • Such a unit will be substantially free from obstructions between the third electrode and the passageway so as to facilitate the deposition of charged particles from a cloud generated over the third plenum chamber upon bottom portions of objects during passage through the passageway.
  • the third electrode will be electrically independent from the first and second ones, and will be adapted for charging to a voltage lower than the voltages thereof.
  • the container of the unit will most desirably have a pair of upstanding parallel interior walls defining in part the first and second plenum chambers and the passageway therebetween, with the first and second baffles being mounted for vertical adjustment thereon.
  • FIG. 1 is a fragmentary side elevational view in partial section of apparatus embodying the present invention
  • FIG. 2 is a diagrammatical side elevational view of the conveyor and the exposed one of the pair of baffles employed in the apparatus of FIG. 1, drawn to a reduced scale snd showing a number of cans being transported for electrostatic coating;
  • FIG. 3 is a right end view of the parts of the apparatus illustrated in FIG. 2 and drawn to a scale slightly enlarged therefrom;
  • FIG. 4 is a right end elevational view of the apparatus of FIG. 1 drawn to an enlarged scale;
  • FIG. 5 is a section view along line 55 in FIG. 1, drawn to the scale of FIG. 4;
  • FIG. 6 is a fragmentary plan view in partial section of the apparatus of FIG. 1;
  • FIG. 7 is a side elevational diagrammatical view of a different baffle and conveyor arrangement suitable for use in the apparatus of the invention.
  • FIG. 8 is a view similar to FIG. 7 showing another type of baffle suitable for use herein.
  • FIGS. 1 6 of the appended drawings therein illustrated is apparatus embodying the present invention and including an electrostatic fluidized bed unit comprised of a fluidic bed base and a cover therefor, generally designated by the numerals l0, 12 respectively.
  • the cover 12 has a peripheral flange 14 with a downwardly opening channel 16 in which is received the upper edge of the sidewall 18 of the base 10.
  • a number of hook locks 20 are spaced about the opening of the base 10, and cooperate with corresponding studs 22 on the flange 14 to lock the cover 12 thereto.
  • the base 10 includes a pair of parallel upstanding interior walls 28 which cooperate with a base plate 30 to define a central trough 32 running along most of the length of the unit.
  • the walls 28 also cooperate with the bottom walls 34 to define two elongated lateral plenum chambers 36, which are coextensive with the trough 32 and lie on opposite sides thereof.
  • Air inlet ports 38 extend through the bottom walls 34 and have diffusion plates 40 positioned thereover, the latter serving to promote distribution along the length of the chambers 36 of air injected through the ports 38.
  • a peripheral flange 42 extends about each of the chambers 36 to provide support for a chamberspanning porous plate 48 which is spaced thereon above the bottom wall 34. Interposed between the flanges 42 and the plates 48 are thin layers 46 of gasket material, and strut elements 44 extend across the flanges 42 to strengthen the base 10 and to provide additional support for the plates 48.
  • the rectangular frames Secure (such as by flat-headed screws) the porous plates 48, and also support the grid-type electrodes 52, which-are substantially equal in area to the plates 48.
  • the electrodes 52 are maintained in place by appropriate frames 54, which may be welded or otherwise secured thereto, the frames 54 being fastened to the flanges 42 by round-headed screws 56.
  • An elongated baffle 58 is secured to each of the interior walls 23 by cooperating clamps 62, which are tightened thereagainst by the nut and bolt fasteners 64 which pass through the walls 28 and through the elongated slots 66 in the baffles 58.
  • the slots 66 enable adjustment of the height as well as the angular attitude of the baffles 58 with respect to the interior walls 28.
  • Each of the baffles 58 has an upper edge which slopes downwardly toward the outlet end of the unit, i.e., in a downstream direction; the edges are in substantial horizontal alignment, and the baffles 58 are parallel to thereby define a passageway 68 of uniform width along the full length of the baffles 58.
  • the cover 12 has a number of spaced reinforcing webs 70, and upstanding flanges 72 which extend along its entire length on either side of the passageway 68.
  • the flanges 72 cooperate with an enclosure or cowling (not illustrated) which substantially surrounds the unit and has marginal edges abutting against the flanges 72 to prevent the entry of powder or debris thereinto.
  • a feed conduit 73 is attached to the cover 12 to provide means for furnishing powder to the unit from a reservoir or supply thereof (not shown), and means (also not shown) maybe present within the unit for detecting the quantity of powder therein to automatically control the feed operation on a continuous basis.
  • the bottom of the unit is furnished with two hoppers 74 which communicate with the central trough 32 and have conduits 76 extending downwardly therefrom.
  • the conduits 76 are hooked into a vacuum system (not shown) to enable the withdrawal of excess powder which would otherwise tend to accumulate in the trough 32, and the butterfly disk 78 and operating mechanism 80 therefor, which are provided on each conduit 76, control the vacuum effect.
  • Each hopper 74 has a cleanout opening 82 that is normally closed by a cover assembly 84, the principal purpose of which is to permit the ready removal of the articles, which may fall into the trough 32 from time to time during the coating operation.
  • a narrow end wall 86 lies transversely between the interior walls 28 adjacent the outer ends thereof and defines, in cooperation with the outer end wall 88 of the unit, a plenum chamber 90 extending across the width thereof.
  • the plenum chamber 90 is provided with inlet ports 92 and diffusion plates 94 for the injection and distribution of air, and the peripheral flange 96, which projects inwardly from about the chamber 90, supports a porous plate 96, a peripheral frame 100, a grid 102, and a grid frame 104.
  • cables for appropriate electrical interconnection, the cables 106,106 providing high voltage to the grids 52 and 102, respectively (the grids 52 normally being maintained at a higher voltage than grid 102), and the cables 108, 108 being connected respectively (by means notshown) to the frame bed 24 and the flanges 72 to maintain them at ground potential.
  • a channel extension 110 Adjacent the outlet end of the unit and in communication with the passageway 86 is a channel extension 110, which serves to enable the controlled release of powder that may become trapped between adjacent articles, vacuum means being attached to the extension 110 for that purpose if so desired.
  • a conveyor 112 which is electrically grounded at 113, is disposed above the unit and has a multiplicity of mounting hangers 1 14 depending therefrom, each supporting a can 116 thereon for coating.
  • the conveyor may be of any conventional design, and the hangers may desirably be electrically conductive and have magnetic coupling elements on the ends thereof to support the cans and maintain them at ground potential; of course, when different articles are to be coated in the unit other support means may be more suitable. As the arrow in FIG.
  • the conveyor 112 transports the cans 116 from left to right along a horizontal path through the passageway 68. Initially, the cans 116 are substantially entirely blocked or masked by the baffles 58; however, due to the slope of the upper edges 60, as the cans 116 proceed downstream progressively lower surface portions become horizontally aligned with the edges 60 and thereby exposed for powder contact behind the baffles 58.
  • the plenum chamber 90 and the porous plate 98 and electrode 102 associated therewith (which constitute a substantially independent cloud chamber or charged particle-generating effect) may therefore be used for this purpose, with the electrode 102 being charged to a substantially lower voltage to afford concomitant power economy and convenience of operation.
  • the cans 116 proceed on the conveyor 112 downstream through the passageway 68 between the baffles 58, over the electrode 102, and outwardly from the unit through the extension 110. They may then pass through sequential excess powder removal, heating and cooling stages, and preheating effects ahead of the fluidic bed unit may also be provided.
  • FIG. 7 wherein a simple modification of the arrangement of the conveyor and baffles employed in the unit is shown.
  • the baffle 58 is substantially the same as baffle 58 of the preceding figures, but has a free upper edge 60' which is substantially horizontally disposed.
  • the conveyor 112' is comparable to the previouslydescribed conveyor 112, but rather than extending horizontally is slightly inclined. As a result, objects depending from the conveyor 112' are progressively exposed behind the baffle 58' with virtually the same coating effect as is produced by the apparatus of the previous embodiment.
  • the embodiment of FIG. 7 affords the advantage of enabling the coating of objects of increased axial length in a direction generally perpendicular to the fluidized bed (extended dimensions parallel to the bed of course presenting little difficulty). Because the edge 60' is a uniform distance above the electrodes (not illustrated, but horizontally disposed therebelow), and the objects pass from a position lower than the electrode location, the axial length that can be coated is not limited by the height to which the charged particles are capable of rising. As will be noted, this is not true of the apparatus of FIGS. 1 6 due to the parallel disposition of the travel path of the cans 116 and the electrodes 52; in such apparatus, it will not generally be feasible to coat objects having portions that are more than about 6-8 inches above the electrodes.
  • FIG. 8 A second modification of the apparatus is shown in PK]. 8 wherein, rather than utilizing a free upper edge of the baffle to provide the edge portion across which the charged particles must pass, the baffle 58" has a complex slot 60" consisting of three rectilinear elements a, b, c, extending therein in the general direction of the travel path.
  • the baffle 58" cooperates with the conveyor 112" to progressively expose lower portions of objects depending therefrom as they travel in the direction indicated by the arrow.
  • the central element b of the slot 60" is substantially horizontal, as a result of which no fresh surfaces of the objects will be exposed during passage thereby.
  • the construction of the fluidized bed is desirably largely of a plastic or other dielectric material so as to prevent interference by the elements thereof with the efficient deposition of powder upon the objects. It might also be important to note that, although it is most desirable to maintain the objects at ground potential during deposition, they may be at other potentials as long as adequate attractive and adhesive forces are produced; moreover, electrical connections to the objects may be dispensed with entirely in some instances.
  • any powder which is conventionally used for electrostatic powder coating may be employed to provide the charged particles in accordance with the present invention.
  • resins such as polyvinyl chloride, polypropylene, polyethylene, epoxies, acrylics, polyesters, etc., may all be used successfully in accordance herewith.
  • the present invention provides a novel electrostatic fluidized bed apparatus and system in which articles of significant axial length may be uniformly coated with charged particles from a cloud thereof.
  • the apparatus and system are highly efficient, safe, and convenient to operate and are, at the same time, relatively simple and inexpensive to produce.
  • the invention also provides a novel method for the coating of such objects with charged particles produced in an electrostatic fluidized bed.
  • a. fluidized bed means including at least a first electrode for producing a cloud of electrostatically charged particles
  • mechanical barrier means effectively interposed between said fluidized bed means and said travel path, and including at least a first upstanding baffle spaced laterally to one side of said travel path and extending along at least a portion thereof, said baffle having an elongated edge portion above said electrode of said fluidized bed across which particles may readily pass from said bed to said travel path, said conveyor means and baffle being so disposed relative to one another that said travel path traverses the imaginary, laterally-extending projection surface of said edge portion at a nonperpendicular angle thereto,
  • edge portion has a complex configuration consisting of a plurality of rectilinear elements that are angularly disposed with respect to one another.
  • baffle has an elongated slot therein extending generally in the direction of said travel path and providing said edge portion thereof.
  • said barrier means includes a second upstanding baffle configured similarly to said first baffle and spaced laterally therefrom to the opposite side of said travel path, said first and second baffles being generally transversely aligned with said travel path therebetween to permit simultaneous coating of two sides of the object conveyed therealong.
  • the apparatus of claim 10 additionally including means in electrical connection with said conveying means for maintaining it at ground potential, said mounting means being electrically conductive to permit grounding of the objects mounted thereby.
  • said fluidized bed means includes at least a second electrode which is electrically independent of said first electrode to permit first and second zones of different voltage to be established therein, said first electrode extending along said travel path portion to provide said first zone and said second electrode extending along a second portion of said path outwardly of said first portion to provide said second zone thereat, said apparatus being substantially free from obstructions between said second electrode and said second portion of said travel path to facilitate the deposition of charged particles from said second zone upon a bottom portion of the object during passage thereover.
  • an electrostatic fluidized bed unit comprising a substantially closed container having a passageway for transport therethrough of objects depending thereinto, and at least a first plenum chamber extending along one side of said passageway, said plenum changer having an inlet for pressurized air and an upwardly directed opening, said unit also including a porous plate and an electrode spanning said opening, and a baffle interposed between said plenum chamber and said passageway, said baffle having an elongated upper edge portion spaced above said electrode and being so disposed that said passageway traverses the imaginary, laterally-extending projection surface of said edge portion at a non-perpendicular angle thereto, so that a cloud of charged particles of a coating material may be generated above said porous plate and electrode of said plenum chamber, and said particles may readily be electrostatically attracted and deposited upon progressively lower vertical portions of objects charged effectively opposite thereto, as such portions horizontally register with said edge portion
  • said container of said electrostatic fluidic unit has a second plenum chamber substantially identical to said first-mentioned plenum chamber and extending along the opposite side of said passageway therefrom, said unit additionally including a second porous plate and electrode spanning the opening of said second chamber, and also having a second barrier of substantially identical configuration to said first-mentioned barrier interposed between said second plenum chamber and said passageway, said unit thereby being adapted to simultaneously coat opposite sides of the objects passed along said passageway with charged particles from clouds generated over both of said first and second plenum chambers.
  • said container of said electrostatic fluidic bed unit has a third plenum chamber downstream along said travel path from said first and second plenum chambers, said third chamber also having an upwardly directed opening with a third porous plate and a third electrode spanning thereacross, and said unit being substantially free from obstructions between said third electrode and said passageway, thereby facilitating the deposition of charged particles from a cloud generated over said third plenum chamber upon bottom portions of objects during passage through said passageway.
  • said third electrode is electrically independent from said first and second electrodes, and is adapted for charging to a voltage lower than the voltages thereof.
  • mechanical barrier means including at least a first generally upstanding baffle effectively interposed laterally between said cloud-producing means and said travel path;
  • said baffle having an elongated edge portion across which particles may readily pass from said cloudproducing means to said travel path, said conveyor means and baffle being so disposed relative to one another that said travel path traverses the imaginary, laterally-extending projection surface of said edge portion at a non-perpendicular angle thereto, so that particles of the cloud may be charged effectively opposite to the object to effect electrostatic attraction therebetween and deposition thereon, so as to develop a coating along an axis that is angularly displaced from the axis of said travel path as progressively lower vertical portions of the object horizontally register with said edge portion and thereby become exposed behind said baffle during passage of the object thereby.
US00254472A 1972-05-18 1972-05-18 Electrostatic fluidized bed Expired - Lifetime US3828729A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00254472A US3828729A (en) 1972-05-18 1972-05-18 Electrostatic fluidized bed
CA171,474A CA1007115A (en) 1972-05-18 1973-05-15 Electrostatic fluidized bed
JP5374073A JPS547026B2 (cs) 1972-05-18 1973-05-16
DE2324803A DE2324803C2 (de) 1972-05-18 1973-05-16 Elektrostatisches Wirbelbettverfahren zum Pulverbeschichten von Werkstücken
GB2333673A GB1426517A (en) 1972-05-18 1973-05-16 Electrostatic fluidised bed
US439347A US3914461A (en) 1972-05-18 1974-02-04 Electrostatic coating method
US05/454,566 US3937179A (en) 1972-05-18 1974-03-25 Particle cloud coating method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00254472A US3828729A (en) 1972-05-18 1972-05-18 Electrostatic fluidized bed

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/454,566 Continuation-In-Part US3937179A (en) 1972-05-18 1974-03-25 Particle cloud coating method and apparatus

Publications (1)

Publication Number Publication Date
US3828729A true US3828729A (en) 1974-08-13

Family

ID=22964434

Family Applications (1)

Application Number Title Priority Date Filing Date
US00254472A Expired - Lifetime US3828729A (en) 1972-05-18 1972-05-18 Electrostatic fluidized bed

Country Status (5)

Country Link
US (1) US3828729A (cs)
JP (1) JPS547026B2 (cs)
CA (1) CA1007115A (cs)
DE (1) DE2324803C2 (cs)
GB (1) GB1426517A (cs)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914461A (en) * 1972-05-18 1975-10-21 Electrostatic Equip Corp Electrostatic coating method
US3937179A (en) * 1972-05-18 1976-02-10 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US3951099A (en) * 1974-04-11 1976-04-20 Electrostatic Equipment Corporation Automatic feed fluidized bed system
US4009301A (en) * 1974-09-05 1977-02-22 Owens-Illinois, Inc. Method for powder coating
US4011832A (en) * 1975-02-26 1977-03-15 Westinghouse Electric Corporation Build control for fluidized bed wire coating
US4368214A (en) * 1981-06-12 1983-01-11 Electrostatic Equipment Corp. Method and apparatus for producing electrical conductors
US4541980A (en) * 1984-01-09 1985-09-17 At&T Technologies, Inc. Methods of producing plastic-coated metallic members
US4606928A (en) * 1985-03-07 1986-08-19 Electrostatic Technology Incorporated Vortex effect electrostatic fluidized bed coating method and apparatus
US4808432A (en) * 1986-08-18 1989-02-28 Electrostatic Technology Incorporated Electrostatic coating apparatus and method
US4950497A (en) * 1989-06-15 1990-08-21 S.L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects
US5041301A (en) * 1989-06-15 1991-08-20 S. L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects with abrasive materials
US5213847A (en) * 1991-06-10 1993-05-25 Electrostatic Technology, Inc. Electrostatic fluidized bed having horizontal and vertical coating effects and method utilizing same
US5242718A (en) * 1987-06-15 1993-09-07 Electrostatic Technology, Inc. Coating apparatus and method with fluidized bed feed effect
US5474609A (en) * 1992-06-30 1995-12-12 Nordson Corporation Methods and apparatus for applying powder to workpieces
US5520735A (en) * 1992-06-30 1996-05-28 Nordson Corporation Nozzle assembly and system for applying powder to a workpiece
US5847650A (en) * 1996-10-04 1998-12-08 Knogo North America Inc. Theft resistant circuit assembly
WO2000054871A1 (en) * 1999-03-17 2000-09-21 Alliedsignal Inc. Method of applying a slip-resistant coating to a spin-on filter using a fluidized bed coating apparatus, and spin-on filter which is a product thereof
US6245391B1 (en) * 1997-12-25 2001-06-12 Nihon Parkerizing Co., Ltd. Powder fluidized bed and coating method utilizing a circulating powder stream
US6312521B1 (en) 1998-12-14 2001-11-06 Primera Foods Corporation Apparatus and process for coating particles
US6312740B1 (en) * 1999-11-23 2001-11-06 James K. Roberts Method and apparatus for electrostatically applying an edible coating to a food product item
US20030044486A1 (en) * 2000-11-27 2003-03-06 Wargocki Michael F. Hydrocolloid films for meat and poultry products
US20030183278A1 (en) * 2002-03-28 2003-10-02 Eskigent Technologies, Inc. Particle-based check valve
DE102004010177A1 (de) * 2004-03-02 2005-10-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Elektrostatische Fluidisierungsvorrichtung und elektrostatisches Wirbelbadverfahren zur Beschichtung von Substraten mit Beschichtungspulver

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505063A (en) * 1947-09-08 1950-04-25 Victor Ind Corp Selective spraying machine for containers
US3061943A (en) * 1958-02-07 1962-11-06 Dunlop Tire & Rubber Corp Apparatus for the heat treatment of sheet materials
US3167454A (en) * 1959-12-24 1965-01-26 Zenith Radio Corp Fluidized-bed type of coating apparatus
US3248253A (en) * 1962-06-22 1966-04-26 Sames Sa De Machines Electrost Electrostatic transfer method and apparatus for coating articles with a fluidized composition
US3382845A (en) * 1964-07-21 1968-05-14 Avisun Corp Separating liquid droplets in spray coating operation
US3695909A (en) * 1969-05-23 1972-10-03 Tunzini Ameliorair Sa Method for electrostatic coating of objects with a powder coating material
US3713862A (en) * 1970-11-16 1973-01-30 Continental Can Co Method for pigmented side striping of can bodies

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB982432A (en) * 1960-06-07 1965-02-03 Int Resistance Co Improvements in or relating to electrical components and the manufacture thereof
DE6609282U (de) * 1963-03-05 1972-04-20 Knapsack Ag Vorrichtung zum ueberziehen von langgestreckten gegenstaenden.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2505063A (en) * 1947-09-08 1950-04-25 Victor Ind Corp Selective spraying machine for containers
US3061943A (en) * 1958-02-07 1962-11-06 Dunlop Tire & Rubber Corp Apparatus for the heat treatment of sheet materials
US3167454A (en) * 1959-12-24 1965-01-26 Zenith Radio Corp Fluidized-bed type of coating apparatus
US3248253A (en) * 1962-06-22 1966-04-26 Sames Sa De Machines Electrost Electrostatic transfer method and apparatus for coating articles with a fluidized composition
US3382845A (en) * 1964-07-21 1968-05-14 Avisun Corp Separating liquid droplets in spray coating operation
US3695909A (en) * 1969-05-23 1972-10-03 Tunzini Ameliorair Sa Method for electrostatic coating of objects with a powder coating material
US3713862A (en) * 1970-11-16 1973-01-30 Continental Can Co Method for pigmented side striping of can bodies

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914461A (en) * 1972-05-18 1975-10-21 Electrostatic Equip Corp Electrostatic coating method
US3937179A (en) * 1972-05-18 1976-02-10 Electrostatic Equipment Corporation Particle cloud coating method and apparatus
US3951099A (en) * 1974-04-11 1976-04-20 Electrostatic Equipment Corporation Automatic feed fluidized bed system
US4009301A (en) * 1974-09-05 1977-02-22 Owens-Illinois, Inc. Method for powder coating
US4011832A (en) * 1975-02-26 1977-03-15 Westinghouse Electric Corporation Build control for fluidized bed wire coating
US4368214A (en) * 1981-06-12 1983-01-11 Electrostatic Equipment Corp. Method and apparatus for producing electrical conductors
US4541980A (en) * 1984-01-09 1985-09-17 At&T Technologies, Inc. Methods of producing plastic-coated metallic members
US4606928A (en) * 1985-03-07 1986-08-19 Electrostatic Technology Incorporated Vortex effect electrostatic fluidized bed coating method and apparatus
WO1986005127A1 (en) * 1985-03-07 1986-09-12 Electrostatic Technology, Inc. Vortex effect electrostatic fluidized bed coating method and apparatus
US4808432A (en) * 1986-08-18 1989-02-28 Electrostatic Technology Incorporated Electrostatic coating apparatus and method
US5242718A (en) * 1987-06-15 1993-09-07 Electrostatic Technology, Inc. Coating apparatus and method with fluidized bed feed effect
US4950497A (en) * 1989-06-15 1990-08-21 S.L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects
US5041301A (en) * 1989-06-15 1991-08-20 S. L. Electrostatic Technology, Inc. Method and apparatus for coating interior surfaces of objects with abrasive materials
US5213847A (en) * 1991-06-10 1993-05-25 Electrostatic Technology, Inc. Electrostatic fluidized bed having horizontal and vertical coating effects and method utilizing same
US5520735A (en) * 1992-06-30 1996-05-28 Nordson Corporation Nozzle assembly and system for applying powder to a workpiece
US5612096A (en) * 1992-06-30 1997-03-18 Nordson Corporation Methods and apparatus for applying powder to workpieces
US5474609A (en) * 1992-06-30 1995-12-12 Nordson Corporation Methods and apparatus for applying powder to workpieces
US5847650A (en) * 1996-10-04 1998-12-08 Knogo North America Inc. Theft resistant circuit assembly
US6245391B1 (en) * 1997-12-25 2001-06-12 Nihon Parkerizing Co., Ltd. Powder fluidized bed and coating method utilizing a circulating powder stream
US6312521B1 (en) 1998-12-14 2001-11-06 Primera Foods Corporation Apparatus and process for coating particles
WO2000054871A1 (en) * 1999-03-17 2000-09-21 Alliedsignal Inc. Method of applying a slip-resistant coating to a spin-on filter using a fluidized bed coating apparatus, and spin-on filter which is a product thereof
US6312740B1 (en) * 1999-11-23 2001-11-06 James K. Roberts Method and apparatus for electrostatically applying an edible coating to a food product item
US20030044486A1 (en) * 2000-11-27 2003-03-06 Wargocki Michael F. Hydrocolloid films for meat and poultry products
US20030183278A1 (en) * 2002-03-28 2003-10-02 Eskigent Technologies, Inc. Particle-based check valve
US6802331B2 (en) * 2002-03-28 2004-10-12 Eksigent Technologies Llc Particle-based check valve
DE102004010177A1 (de) * 2004-03-02 2005-10-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Elektrostatische Fluidisierungsvorrichtung und elektrostatisches Wirbelbadverfahren zur Beschichtung von Substraten mit Beschichtungspulver
DE102004010177B4 (de) * 2004-03-02 2007-09-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Elektrostatische Fluidisierungsvorrichtung und elektrostatisches Fluidisierungsverfahren zur Beschichtung von Substraten mit Beschichtungspulver

Also Published As

Publication number Publication date
CA1007115A (en) 1977-03-22
DE2324803C2 (de) 1983-03-10
DE2324803A1 (de) 1973-12-06
JPS4941432A (cs) 1974-04-18
GB1426517A (en) 1976-03-03
JPS547026B2 (cs) 1979-04-03

Similar Documents

Publication Publication Date Title
US3828729A (en) Electrostatic fluidized bed
US3914461A (en) Electrostatic coating method
CA1087934A (en) Web or coil coating and powder feed
US3741155A (en) Apparatus for particulate coating of an elongate article
US3248253A (en) Electrostatic transfer method and apparatus for coating articles with a fluidized composition
EP0085149B1 (en) Process and apparatus for electrostatic application of liquids or powders on substances or objects
US4427712A (en) Electrodynamic coating process
US3942420A (en) Spray booth for electrostatic powder coating
US3937179A (en) Particle cloud coating method and apparatus
US4053661A (en) Particle cloud coating method and apparatus
US4084019A (en) Electrostatic coating grid and method
US3889015A (en) Coating method with cleaning
US4297386A (en) Control grid in electrostatic fluidized bed coater
US3921574A (en) Coating method with cleaning and apparatus therefor
US5773097A (en) Vertical electrostatic coater having vortex effect
US3011472A (en) Electrostatic sprayer
KR19990073019A (ko) 분말교차공급오거및방법
US3799112A (en) Vat device for the treatment of articles in a fluidified medium
US3376156A (en) Spray painting employing high voltage charging
US4258655A (en) Electrostatic spray apparatus
US4376136A (en) Method for electrostatically depositing powder in several different layers on objects
US20030044524A1 (en) Vibratory electrostatic fluidized bed for powder paint coating
US3016876A (en) Apparatus for electrostatically spray coating articles
US3961600A (en) Apparatus for coating incandescent lamp bulbs
JPS5944908B2 (ja) 粉体塗装装置

Legal Events

Date Code Title Description
STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)

AS Assignment

Owner name: CITYTRUST, 961 MAIN STREET, BRIDGEPORT, CT

Free format text: SECURITY INTEREST;ASSIGNOR:ELECTROSTATIC EQUIPMENT CORP.;REEL/FRAME:005006/0950

Effective date: 19880830

AS Assignment

Owner name: ELECTROSTATIC TECHNOLOGY, INC.

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITYTRUST, A CT STATE BANK AND TRUST COMPANY;REEL/FRAME:005243/0126

Effective date: 19890510