US3336903A - Electrostatic coating apparatus - Google Patents

Electrostatic coating apparatus Download PDF

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Publication number
US3336903A
US3336903A US361365A US36136564A US3336903A US 3336903 A US3336903 A US 3336903A US 361365 A US361365 A US 361365A US 36136564 A US36136564 A US 36136564A US 3336903 A US3336903 A US 3336903A
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United States
Prior art keywords
particles
article
cloud
potential
coating
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Expired - Lifetime
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US361365A
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English (en)
Inventor
Marcel A R Point
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Machines Electrostatiques SA
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Sames Sa De Machines Electrost
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • 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
    • B05C19/001—Flocking
    • B05C19/002—Electrostatic flocking
    • 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

  • a portable electrostatic spray gun is substituted for the stationary container.
  • a cloud of the particles of coating material is projected from the discharge nozzle of the gun and is electrostatically charged to produce an attraction between the particles and the surface of the article being coated. The thus charged particles settle uniformly over the article to provide the desired coating.
  • Electrostatic coating methods and apparatus of the foregoing type exhibit numerous important advantages over more conventional coating techniques. These advantages include a higher uniformity in the depth of the coating, substantially reduced losses of coating material and an improved bond between the individual particles of material and the surface of the article. Accordingly, and particularly in the light of the comparatively recent development of compact electrostatic generators for producing the needed voltages, such processes and apparatus have gained Wide acceptance.
  • One general object of this invention is to provide new and improved electrostatic coating apparatus for applying a finely divided coating substance to a surface of an article to be coated.
  • Another object of this invention is to provide electrostatic coating apparatus of the character indicated in which the adverse effects of stray electrical fields are substantially reduced.
  • a further object of the invention is to provide electrostatic coating apparatus utilizing comparatively simple components which is economical to manufacture and thoroughly reliable in operation.
  • electrostatic coating apparatus which includes a supply of fluidizing gas for forming a floating cloud of the finely divided coating material to be applied to the surface of the article.
  • One or more charging electrodes are positioned Within the cloud and are supplied :with a high DC. potential, say, one hundred kilovolts, to electrically charge the individual particles to a corresponding potential.
  • An electrostatic field is thereby set up between the particles and the surface of the article to carry the particles toward the article.
  • a control electrode is arranged in spaced juxtaposition with the charging electrode and is electrically grounded or otherwise connected to a potential different from the potential of the charged particles in the cloud of coating material. Individual charged particles adjacent the control electrode are discharged thereby to prevent the spreading of the cloud beyond predetermined well defined limits. The arrangement is such that any tendency of the cloud to extend beyond these limits is avoided, and the adverse effects resulting from extraneous electrical fields are substantially reduced.
  • FIGURE 1 is a diagrammatic view, with certain parts shown in section, of electrostatic coating apparatus in accordance with one illustrative embodiment of the invention
  • FIGURE 2 is a simplified perspective view, partly broken away and in section
  • the false bottom 2 supports a mass 3 of finely divided coating material which is to be applied to the articles (not shown in FIGURE 1) to be coated. These articles customarily are advanced in succession (as by an overhead conveyor, for example) to a position immediately above the container 1.
  • the coating material illustratively comprises a synthetic resin, powder enamel, metallic powder or other finely divided substance which is fluidized to form a cloud of particles within the container.
  • One end of a fluidizing conduit 4 communicates with the chamber beneath the false bottom 2, while the other end is supplied with compressed air or other fluidizing gas under in accordance with still another pressure.
  • the air As the air is introduced from the conduit 4 into the chamber, it passes in an upward direction through the pores or perforations in the bottom 2 and maintains the particles 3 in a state of continuous agitation and turbulence to form the cloud.
  • the individual particles in the cloud describe random trajectories somewhat in the manner of the molecules of a fluid, but with the cloud as a whole remaining substantially stationary within the container.
  • the level of the upper boundary of the cloud is of course substantially above the level of the coating particles when in a static or non-fluidized condition.
  • a series of upstanding point electrodes or ionizers 6 are positioned adjacent the upper surface of the false bottom 2 in juxtaposition with the cloud 3. These electrodes are affixed to a horizontal supporting rack 10 immediately above the bottom 2 with the points of the electrodes extending upwardly into the fluidized cloud.
  • the electrodes 6 advantageously are arranged in spaced relationship with each other in a planar array throughout the horizontal extent of the cloud.
  • the electrodes 6 are of electrically conductive material, although in other advantageous arrangements resistive or semi-conductive electrodes are employed with good efi'ect.
  • the supporting rack 10 is electrically conductive and serves to connect the individual electrodes to an insulated conductor 11 leading to the negative terminal of a high DC.
  • voltage generator 7 is of conventional construction and is arranged to develop an output potential which illustratively is of the order of about one hundred kilovolts.
  • the high D.C. potential from the generator 7 is applied to the point electrodes 6 to charge the individual particles 3 of coating material in the cloud to a corresponding potential.
  • the article to be coated on the other hand, is at a diiferent potential and customarily is connected to ground. An electrical field is thereby established between the particles and the article, and the particles are guided by electrostatic attraction along lines of force toward the surface of the article to form a uniform and smooth coating.
  • the point electrodes 6 act both through direct con tact with the agitated particles and through the intermediacy of ionized air molecules to impart to substantially all of the particles in the container a high DC. potential corresponding to the output potential of the generator 7.
  • the charged particles are rapidly and efficiently applied to the surface of the article and cling firmly thereto as a result of the electrostatic attraction.
  • the structure described thus far is merely illustrative of a known combination of electrostatic coating components. It will be readily apparent that the upper level of the cloud of particles 3 should be sufficiently close to the article above the container 1 to enable the electrostatic deposition of the particles thereon. On the other hand, particularly prior to the time the article approaches the container, the elevation of the cloud should be maintained beneath the rim of the container to avoid spilling or other discharge of the particles. Although the upper level of the cloud of course is determined in part by the rate of flow and velocity of the fluidizing gas delivered through the conduit 4, electrical factors also intervene. Because the individual particles are charged to the same high DC. potential, they tend to repel One another.
  • each of the electrodes 8 is in the form of a point and is generally similar to one of the charging electrodes 6.
  • the electrodes 8 are mounted on the inner side walls of the container 1 at a predetermined height above the electrodes 6 and in spaced relationship with the article to be coated.
  • the pointed ends of the electrodes 8 project into the container in a generally horizontal direction and are at ground or other potential substantially similar to that of the article.
  • the particles of coating material form a cloud and are electrically charged by the charging electrodes 6.
  • the control electrodes 8 are discharged both by direct contact with the electrodes and particularly through the ionization of air molecules to create ions of a polarity opposite to tthat of the particles.
  • the number and position of the electrodes 8 are such that the height of the fluidized cloud of particles is controlled with a good degree of accuracy both in the presence of a grounded article above the container 1 and in the absence of such article.
  • the upper level of the cloud is substantially independent of the size of the articles, and even comparatively small articles are coated without undesirable spilling of particles from the container.
  • the electrodes 8 in effect establish a controlling electrostatic field around the upper marginal periphery of the container 1 which improves the stability of the cloud and renders it less sensitive to undesired extraneous fields.
  • the container 1 advantageously is vibrated by means of a vibrator device shown schematically at 5.
  • the vibrator 5 is mounted on the horizontal bottom wall of the container and serves to shake off individual particles from the fluidized cloud which settle on the control electrodes 8. The thus removed particles drop into the container where they are recycled in the cloud and are again charged to a high D.C. potential by the electrodes 6.
  • the vibrator 5 also improves the fiuidizing action.
  • the mass 3 of coating particles within the container 1 is fluidized through the use of compressed air to form a floating cloud of charged particles in a manner similar to that described above.
  • a pair of control electrodes in the form of fine wire loops 8 are disposed in horizontal planes on the inner walls of the container 1 immediately beneath the containers upper periphery. These loops extend throughout upper marginal areas of the cloud and are fabricated from stainless steel wire which illustratively has a diameter of about 0.1 or 0.2 mm.
  • the loops 8' are vertically spaced from each other and are supported from the inner wall of the container by suitable supports 9 of dielectric material. Both of the loops are in spaced relationship with the charging electrodes (not visible in FIGURE 2) and are electrically connected to ground, as is the article to be coated.
  • the particles are discharged and return to the main body portion of the cloud within the container 1.
  • the spatial extent of the cloud is thereby limited to substantially eliminate any possibility of the particles spilling from the container or being attracted by extraneous electrical fields.
  • the equipment for forming the fluidized cloud of particles and applying electrostatic charges thereto includes a stationary container supplied with gas under pressure and a series of point electrodes.
  • the particles are fluidized and charged through the use of portable equipment such as an electrostatic spray gun.
  • FIGURE 3 there is shown a spray gun 21 which is arranged to apply liquid paint or other coating material to an article 25.
  • This article illustratively is in the form of a flat panel of metal or plastic.
  • the spray gun 21 is provided with a nozzle 22 operatively associated therewith which comprises a charging electrode of conductive or semiconductive material.
  • the nozzle 22 is electrically connected to the insulated negative tenminal of a high voltage D.C.
  • the article 25 is suspended from a monorail conveyor or other suitable overhead support, shown schematically at 29, and is electrically connected to ground.
  • the fluidized particles of coating substance are charged to a high DC. potential corresponding to that of the generator 23 as they issue from the nozzle 22.
  • the particles form a cloud adjacent the nozzle 22 which is charged substantially entirely throughout its spatial extent. This cloud proceeds to float at a relatively slow velocity along the lines of force of the electric field present between the nozzle 22 and the article 25.
  • a series of control electrodes 26 in spaced juxtaposition with the nozzle.
  • the electrodes 26 are arrayed adjacent the side of the article 25 remote from that facing the spray gun 22 and are in the form of fine electrically conductive wires, in this case four widely spaced vertical wires, connected to ground or other potential substantially similar to that of the article.
  • the electrodes 26 are carried by a vibrator device 27 which is effective to facilitate the removal of powder particles which settle on the individual wires.
  • Suitable collecting means may be provided beneath the electrodes 26 for collecting the particles from the wires and recycling them through the flexible hose 24.
  • a screen 28 of electrically non-conductive material advantageously is positioned behind the wires 26 in spaced relationship therewith to reflect any particles passing through the wires.
  • control electrodes may assume forms other than those illustrated and may be arrayed in various positions.
  • the electrodes 26 may be positioned along opposite sides of the spraying station or at other locations.
  • the active portions of the control electrodes preferably are of small radius, that is, in the form of sharp points, thin wires or the like. Other, larger radius portions of the control electrodes may if necessary be covered with insulation.
  • the invention in many respects is applicable to the coating of articles with finely divided liquid droplets, e.g., paint, as well as to the coating of articles with fine powder particles.
  • Apparatus for coating an article with a finely divided coating substance comprising, in combination, means for forming a fluidized bed of the finely divided coating substance adjacent a surface of the article to be coated, charging electrode means in juxtaposition with said fluidized bed for applying a first electrical. potential to the individual particles of coating substance therein, means for connecting said article to a second electrical potential, to establish an electrostatic field between said particles and the surface of said article, the thus charged particles being guided by electrostatic attraction toward said surface, and control electrode means at a potential different from said first potential and positioned in spaced relation with said charging electrode means for controlling the spatial extent of said fluidized bed.
  • Apparatus for coating the surface of an article with a finely divided coating substance comprising, in combination, means for forming a fluidized bed of the finely divided coating substance adjacent the surface of said article, charging electrode means supplied with a high DC. potential, said charging electrode means being positioned in close proximity with said fluidized bed to charge the individual particles of coating substance therein to said high DC. potential, to establish an electrostatic field between said particles and the surface of said article whereby charged particles from said bed are guided by electrostatic attraction toward said surface, and control electrode means connected to a potential substantially different from said high DC. potential and positioned around the periphery of the fluidized bed in spaced relation with said charging electrode means for controlling the spatial extent of said fluidized bed.
  • Apparatus for coating an article with a finely divided coating substance comprising, in combination, a container for the coating substance adjacent a surface of the article to be coated, means for directing fluid under pressure into said container to form a fluidized bed of the coating substance, charging electrode means positioned within said container in juxtaposition with said fluidized bed for applying a first electrical potential to the individual particles of coating substance therein, the thus charged particles being guided by electrostatic attraction toward said surface, and control electrode means at a potential different from said first potential and positioned in spaced relation with said charging electrode means for controlling the spatial extent of said fluidized bed.
  • Electrostatic coating apparatus for applying a finely divided coating substance to a surface of an article, said apparatus comprising, in combination, a container for the coating substance, means for delivering fluidizing gas under pressure into said container, said fluidizing gas forming a fluidized bed of finely divided particles of said coating substance, charging electrode means supplied with a high DC. potential relative to the potential of the article to be coated and positioned within said container for charging said fluidized bed to said high DC. potential, means for connecting said article to ground potential, to establish an electrostatic field between said particles and the surface of said article, whereby particles from said bed are guided by electrostatic attraction toward the surface of said article, and control electrode means connected to a potential substantially similar to that. of said article and positioned above said charging electrode means in spaced relation therewith for controlling the vertical extent of said fluidized bed.
  • Electrostatic coating apparatus for applying a finely divided coating substance to a surface of an article, said apparatus comprising, in combination, a container for the coating substance having a foram'inous false bottom, said container defining a substantially enclosed chamber beneath said false bottom, means for delivering fluidizing gas under pressure into said chamber, said fluidizing gas being discharged from said chamber through said false bottom to form a fluidized bed of finely divided particles of said coating substance, charging electrode means supplied with a high DC. potential relative to the potential of the article to be coated and positioned adjacent said fluidized .bed for charging the particles therein to said high DC.
  • control electrode means connected to a potential substantially similar to that of said article and positioned in spaced relation with said charging electrode means, said control electrode means being supported by the inner wall of said container and extending around the fluidized bed for controlling the spatial extent of said fluidized bed.
  • Electrostatic coating apparatus for applying a finely divided coating substance to a surface of an article, said apparatus comprising, in combination, a container for the coating substance having a foraminous false bottom, said container defining a substantially enclosed chamber beneath said false bottom, means for delivering fluidizing gas under pressure into said chamber, said fluidizing gas being discharged from said chamber through said false bottom to form a cloud of finely divided particles of said coating substance, charging electrode means including a first set of spaced-apart point electrodes supplied with a high D.C. potential relative to the potential of the article to be coated, said first set of electrodes being positioned adjacent the upper surface of said false bottom for charging said cloud substantially entirely throughout the extent thereof to said high DC.
  • control electrode means including a second set of spacedapart point electrodes connected to a potential substantially similar to that of said article, said second set of electrodes being supported by the inner wall of said container in spaced relation with said first set of electrodes for controlling the vertical extent of said cloud.
  • Electrostatic coating apparatus for applying a finely divided coating substance to a surface of an article, said apparatus comprising, in combination, a container for the coating substance having a foraminous false bottom, said container defining a substantially enclosed chamber beneath said false bottom, means for delivering fluidized gas under pressure into said chamber, said fluidizing gas being discharged from said chamber through said false bottom to form a cloud of finely divided particles of said coating substance, charging electrode means supplied with a high DC.
  • control electrode means including at least one wire loop connected to a potential substantially similar to that of said article for controlling the vertical extent of said cloud, said loop being supported by the inner wall of said container in spaced relation with said charging electrode means and extending throughout marginal areas of said cloud.

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  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US361365A 1963-04-24 1964-04-21 Electrostatic coating apparatus Expired - Lifetime US3336903A (en)

Applications Claiming Priority (1)

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FR932485A FR1367496A (fr) 1963-04-24 1963-04-24 Perfectionnements au revêtement électrostatique d'objets

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BE (1) BE646890A (es)
CH (1) CH401769A (es)
DE (1) DE1577922A1 (es)
DK (1) DK120785B (es)
ES (1) ES299121A1 (es)
FR (1) FR1367496A (es)
GB (1) GB1056612A (es)
NL (1) NL6404400A (es)
SE (1) SE322447B (es)

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US3485654A (en) * 1966-03-15 1969-12-23 Nat Steel Corp Method of preparing metal coated metallic substrates
US3497376A (en) * 1966-10-10 1970-02-24 Us Air Force Method for application of solid lubricant coatings
US3501328A (en) * 1966-04-28 1970-03-17 Ransburg Electro Coating Corp Electrostatic adherent deposition of resinous powders
US3503775A (en) * 1966-04-12 1970-03-31 Nat Steel Corp Method of preparing metal coated metallic substrates
US3557750A (en) * 1968-07-01 1971-01-26 Standard Pressed Steel Co Apparatus for applying a thermoplastic locking patch on a threaded fastener
US3566833A (en) * 1968-06-28 1971-03-02 Anaconda Wire & Cable Co Continuous coating apparatus
US3593678A (en) * 1966-04-22 1971-07-20 Ransburg Electro Coating Corp Electrostatic coating methods and apparatus
US3599603A (en) * 1968-10-23 1971-08-17 Ashdie Electrostatic coating system
US3649326A (en) * 1969-03-27 1972-03-14 Brunswick Corp Coated article and method of forming the same
US3660136A (en) * 1970-11-23 1972-05-02 Gen Electric Method of coating slotted articles
US3682136A (en) * 1971-03-04 1972-08-08 Armco Steel Corp Conveyor for electropainting
US3713862A (en) * 1970-11-16 1973-01-30 Continental Can Co Method for pigmented side striping of can bodies
US3774573A (en) * 1971-06-30 1973-11-27 Diagnastic Instr Inc Powder cloud generator and method
US3793049A (en) * 1969-06-16 1974-02-19 R Probst Electrostatic coating method
US3793985A (en) * 1966-07-25 1974-02-26 Xerox Corp Imaging system
US3865079A (en) * 1973-08-27 1975-02-11 Gen Motors Corp Electrostatic fluid bed powder coating system
US4046074A (en) * 1976-02-02 1977-09-06 International Business Machines Corporation Non-impact printing system
US4084019A (en) * 1976-02-05 1978-04-11 Armco Steel Corporation Electrostatic coating grid and method
US4100883A (en) * 1976-10-18 1978-07-18 General Electric Company Apparatus for electrostatic deposition on a running conductor
US4188413A (en) * 1976-10-18 1980-02-12 General Electric Company Electrostatic-fluidized bed coating of wire
US4271783A (en) * 1978-01-20 1981-06-09 General Electric Company Apparatus for fluidized bed-electrostatic coating of indefinite length substrate
US4286021A (en) * 1971-01-22 1981-08-25 Rohm And Haas Company Powder coatings containing copolymer containing isobornyl methacrylate as melt flow modifier
US4297386A (en) * 1980-01-23 1981-10-27 Electrostatic Equipment Corporation Control grid in electrostatic fluidized bed coater
US4330567A (en) * 1980-01-23 1982-05-18 Electrostatic Equipment Corp. Method and apparatus for electrostatic coating with controlled particle cloud
US4749593A (en) * 1985-02-21 1988-06-07 Prazisions-Werkzeuge Ag Coating arrangement and process for preventing deposits of a coating material
US4774102A (en) * 1986-06-09 1988-09-27 Morton Thiokol, Inc. Method of electrostatic powder spray coating
US4779564A (en) * 1986-06-09 1988-10-25 Morton Thiokol, Inc. Apparatus for electrostatic powder spray coating and resulting coated product
US4962885A (en) * 1978-04-17 1990-10-16 Coffee Ronald A Process and apparatus for spraying liquid
US4971829A (en) * 1987-06-08 1990-11-20 Canon Kabushiki Kaisha Spraying process for corona charges spacer material and attracting the same to plate having an electrical potential
US5120423A (en) * 1989-03-22 1992-06-09 Matsushita Electric Industrial Co., Ltd. Method for the formation of an electrolyte layer of solid electrolytic capacitors
US20040122297A1 (en) * 2002-12-18 2004-06-24 Stahmann Jeffrey E. Advanced patient management for identifying, displaying and assisting with correlating health-related data
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
US20060153980A1 (en) * 2003-07-07 2006-07-13 Elpatronic Ag Method for coating objects, electrode arrangement, and coating system
DE102007029142A1 (de) * 2007-06-25 2009-01-02 3D-Micromac Ag Schichtauftragsvorrichtung zum elektrostatischen Schichtauftrag eines pulverförmigen Werkstoffes sowie Vorrichtung und Verfahren zum Herstellen eines dreidimensionalen Objektes
US20180309136A1 (en) * 2015-09-28 2018-10-25 VON ARDENNE Asset GmbH & Co. KG Method for substrate coating with particles and device for carrying out the method

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CA1156452A (en) * 1981-10-19 1983-11-08 Jorg-Hein Walling Electrode for a fluidizable bed coating apparatus

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US2773472A (en) * 1951-08-14 1956-12-11 Gen Motors Corp Apparatus for electrostatic spray coating
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US3004861A (en) * 1956-01-12 1961-10-17 Polymer Corp Methods and apparatus for applying protective coatings
US2955565A (en) * 1956-03-19 1960-10-11 Electro Dispersion Corp Electrostatic coating apparatus
US3059613A (en) * 1958-08-25 1962-10-23 Nakaya Eizo Electrostatic coating device
US3054697A (en) * 1960-02-29 1962-09-18 Ford Motor Co Electrostatic painting
US3254625A (en) * 1960-03-31 1966-06-07 Cecil W Armstrong Apparatus for producing a fluidized bed of pulverant material
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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3485654A (en) * 1966-03-15 1969-12-23 Nat Steel Corp Method of preparing metal coated metallic substrates
US3503775A (en) * 1966-04-12 1970-03-31 Nat Steel Corp Method of preparing metal coated metallic substrates
US3593678A (en) * 1966-04-22 1971-07-20 Ransburg Electro Coating Corp Electrostatic coating methods and apparatus
US3501328A (en) * 1966-04-28 1970-03-17 Ransburg Electro Coating Corp Electrostatic adherent deposition of resinous powders
US3793985A (en) * 1966-07-25 1974-02-26 Xerox Corp Imaging system
US3497376A (en) * 1966-10-10 1970-02-24 Us Air Force Method for application of solid lubricant coatings
US3566833A (en) * 1968-06-28 1971-03-02 Anaconda Wire & Cable Co Continuous coating apparatus
US3557750A (en) * 1968-07-01 1971-01-26 Standard Pressed Steel Co Apparatus for applying a thermoplastic locking patch on a threaded fastener
US3599603A (en) * 1968-10-23 1971-08-17 Ashdie Electrostatic coating system
US3649326A (en) * 1969-03-27 1972-03-14 Brunswick Corp Coated article and method of forming the same
US3793049A (en) * 1969-06-16 1974-02-19 R Probst Electrostatic coating method
US3713862A (en) * 1970-11-16 1973-01-30 Continental Can Co Method for pigmented side striping of can bodies
US3660136A (en) * 1970-11-23 1972-05-02 Gen Electric Method of coating slotted articles
US4286021A (en) * 1971-01-22 1981-08-25 Rohm And Haas Company Powder coatings containing copolymer containing isobornyl methacrylate as melt flow modifier
US3682136A (en) * 1971-03-04 1972-08-08 Armco Steel Corp Conveyor for electropainting
US3774573A (en) * 1971-06-30 1973-11-27 Diagnastic Instr Inc Powder cloud generator and method
US3865079A (en) * 1973-08-27 1975-02-11 Gen Motors Corp Electrostatic fluid bed powder coating system
US4046074A (en) * 1976-02-02 1977-09-06 International Business Machines Corporation Non-impact printing system
US4084019A (en) * 1976-02-05 1978-04-11 Armco Steel Corporation Electrostatic coating grid and method
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US4188413A (en) * 1976-10-18 1980-02-12 General Electric Company Electrostatic-fluidized bed coating of wire
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Also Published As

Publication number Publication date
NL6404400A (es) 1964-10-26
FR1367496A (fr) 1964-07-24
SE322447B (es) 1970-04-06
CH401769A (fr) 1965-10-31
GB1056612A (en) 1967-01-25
BE646890A (es) 1964-08-17
DK120785B (da) 1971-07-12
ES299121A1 (es) 1964-08-16
DE1577922A1 (de) 1970-03-26
AT247997B (de) 1966-07-11

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