US3735925A - Method and device for electrostatic spraying of material - Google Patents

Method and device for electrostatic spraying of material Download PDF

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Publication number
US3735925A
US3735925A US00165606A US3735925DA US3735925A US 3735925 A US3735925 A US 3735925A US 00165606 A US00165606 A US 00165606A US 3735925D A US3735925D A US 3735925DA US 3735925 A US3735925 A US 3735925A
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United States
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electrode
sprayed
supply duct
spraying
condenser
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US00165606A
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English (en)
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G Benedek
A Buday
A Bese
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    • 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
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying

Definitions

  • ABSTRACT A method and apparatus for electrostatically charging material to be sprayed onto a surface, by pressing the material to be sprayed between two electrodes of a condenser positioned in a spaced-apart relationship and insulated from each other by a dielectric.
  • One of the electrodes is connected to a high-voltage, low-amperage power supply and the other electrode is grounded to create a uniform electrical field through which the material to be sprayed is passed for achieving a strong, uniform electrostatic charging of all the material to be sprayed while requiring less voltage and current for operation than the prior art devices and methods.
  • This invention relates to a method and a device for the electrostatic spraying of dyestuffs, powder, fibrous substances and the like, in which the material to be sprayed is charged electrostatically and is then applied to an object which has the opposite electrical charge.
  • electrostatic spraying methods and devices are already known for coating objects with corrosionprotecting or decorative material or for the application of a dye layer.
  • an electrode is used to charge the material to be sprayed, with this electrode having a metallic or a semiconductor connection with a power source having a voltage of 50-150 kV. This electrode charges the material to be sprayed either by direct contact or through ionized air layers.
  • the high voltage source For preventing accidents during the operation of the spraying apparatus, it is absolutely necessary that the high voltage source have a low short circuit current be about 200 microA. However, even with this low current value, it is extremely important that the electrical charge contained in the spraying device is not discharged undarnped. A choke resistance of several Megohoms has therefore been provided.
  • Electrostatic spraying devices are also known in which the transfer of the electrical charge to the material to be sprayed is accomplished by means of a metal electrode arranged in the interior of the spraying head.
  • this electrode in the spraying head is placed as far toward the interior as possible and if it is provided with adequate insulation, then these known devices are indeed completely spark proof.
  • these known devices do entail the disadvantage that the charge of the material to be sprayed, which is achieved through them, as a rule, is not sufficiently strong to accomplish uniform coating.
  • the problem is that in this type of equipment, a sufficiently strong charge is essentially produced only in the core and not in the outer sections of the dispersion cone.
  • the purpose of this invention is to present a method and device for the electrostatic spraying of dyestuffs, powdery materials, fibrous materials or the like, of the type mentioned above, with which the best possible uniform charge of the material to be sprayed and thus the most uniformly possible homogeneous v value.
  • the value of this current has been determined to coating can be achieved with the smallest possible required electrical voltage.
  • a stronger charge of the material to be sprayed is achieved, wherever possible, with the use of a lower high voltage than has been used so far to date.
  • the material to be sprayed is conducted, prior to its being sprayed, between the two electrodes of a condenser which are positioned opposite each other a short distance apart, the electrodes being insulated by a dielectric, and charged electrically with a different polarity by means of high voltage.
  • the material to be sprayed is then electrically charged in the electrical field of this condenser.
  • the force field for charging the material to be sprayed is constituted by the electrode in the sprinkling head and by the object to be sprayed which serves as a counter-electrode. These electrodes, as a rule, are spaced at an interval of about 15-50 cm from each other.
  • a force field is used for charging the material to be sprinkled. This force field is constituted between two electrodes of an electrical condenser which are positioned opposite each other at a small interval of a few millimeters or tenths of a millimeter, with the material to be charged being conducted between these two electrodes prior to reaching the spraying head.
  • the force field between these two closely adjoining electrodes of a condenser is, with an applied voltage which is smaller than in the hitherto prior art methods, considerably greater than the force field which is developed in the known prior art methods between the electrode in the spraying head and the object to be sprayed, which acts as the counter-electrode, so that the charging of the materials which are to be sprayed, which are conducted between the two electrodes of the condenser in the method of the present invention, is considerably stronger and more uniform than in the past.
  • This charging is independent of the distance between the spraying head and the object to be sprayed and is also more uniform than in the past.
  • This charging is independent of the distance between the spraying head and the object to be sprinkled and is also independent of whether the object to be sprayed has a level or uneven surface, for example, with protruding points or tips, which, in the known method, incline toward the increased accumulation of the sprayed material.
  • an average field intensity of 3-5kV/cm is developed in the case of an applied voltage of kV and an object to be sprayed having an almost level surface and spaced at a distance of 20 cm from the electrode in the spraying head.
  • the field intensity of 30-50 kV/cm, which is completely sufiicient for spraying is assured, even with an applied voltage of only 15-20 kV, by means of the two electrodes of the condenser which are spaced-apart at a small interval of a few millimeters or tenths of a millimeter from each other, these electrodes forming the condenser through which the material to be sprayed passes prior to spraying.
  • this method according to the present invention guarantees the extraordinary uniform charging of the material to be sprayed by means of this force field.
  • This invention also relates to a spraying device for the effective implementation of the method according to the present invention, which uses a spraying head and a duct for the supply of the spraying material to the spraying head, and having an electrode which is connected to a high-voltage source. A charge is supplied to the electrode from this high-voltage source, that differs with respect to the object to be sprayed.
  • This spraying device is characterized, according to the present invention, by the fact that the electrode, which is differently charged with respect to the object to be sprayed, is positioned opposite a counter-electrode at a small interval therebetween, and, along with this counter-electrode, forms a condenser through which the material to be sprayed is conducted.
  • This condenser is arranged in front of the spraying head with the supply duct for the material.
  • the interval or spacing between the two electrodes of the condenser inside the supply duct to the sprinkler head may be a few millimeters or tenths of a millimeter.
  • One of the two electrodes is practicalably coated with a dielectric which faces toward the opposite electrode.
  • the material to be sprayed is conducted between the coated electrode and the uncoated electrode of the condenser, whereby, in the case of an applied voltage of 20 kV and an electrode interval of 2 mm, a force field of 100-200 kV/cm is developed. This force field is considerably greater than the force fields which have been obtained with the hitherto known methods and devices.
  • the electrode which is connected to the highvoltage power source and which is diflerently charged by that source with respect to the object to be sprayed, is spaced further from the exit end of the supply duct on the spray head of the device than the other electrode of the condenser which is positioned opposite the charged electrode.
  • Both electrodes of the condenser are arranged in the interior of the sprinkler device and are effectively insulated with respect to the outside surfaces of the equipment, more specifically, through a reliable operating safety insulating layer and through a corresponding insulation interval, in order to make the equipment completely sparkproof and accident proof.
  • the equipment can be powered with a considerably lower voltage than in the hitherto known equipment units, which further reduces the danger of accident. In practice this means that, compared to the hitherto used voltage, a voltage of only -30 kV will sufl'ice for the adequate charging of the material to be sprayed, in the method and equipment according to this invention.
  • the two electrodes of the condenser can be made up of pipes which are placed concentrically inside each other, whereby the supply duct for the material to be sprayed is located between these two pipes which are separated by a dielectric.
  • This duct can have a cylindrical or spiral shape. If the spiral design is used, it is best constituted by means of a groove that is spirally arranged in the dielectric.
  • the invention can be used advantageously not only in manual spraying devices but also in all spraying and coating devices based on the principle of electrostatic charging.
  • FIG. 1 shows the basic principle of operation of the method according to the present invention
  • FIG. 2 illustrates a longitudinal cross-section of one device according, to the present invention used in implementing this method
  • FIG. 3 shows a longitudinal cross-section of another design for carrying out the present invention.
  • a condenser made up of two electrodes 1 and 4 which are spaced a short distance from each other opposite one another, and which have the shape of ribs or strips.
  • An electrode 1 is connected via an insulated cable 3 with a high-voltage power source 2, whose other pole is grounded.
  • the opposite electrode 4 is grounded and is coated with a dielectric material 5 facing toward electrode 1.
  • dielectric 5 and electrode 1 Between dielectric 5 and electrode 1 is the passage or duct 8 for the material to be sprayed which is fed to this duct 8 through a pipe 7.
  • an endpiece 6 is connected to the electrode 1. This endpiece does not have any current passing through it and is not excited, and, together with the opposite end of the dielectric 5, constitutes the exit end 9 or nozzle of the supply duct 8 for the spraying material.
  • the material to be sprayed which is brought in through pipe 7, is charged between the two electrodes 1 and 4 by the strong force field which develops between the'se two electrodes so that when the charged material 8 reaches the end 9 of the supply duct, it crosses the spraying space 10 and is precipitated on the object to be sprayed, which has the same potential as the counter-electrode 6 and which can be grounded for safety reasons.
  • the spraying member as well as the charge member of the spraying device are illustrated schematically in a cross-section.
  • the two electrodes 1 and 4 which constitute a condenser in the supply duct for the material to be sprayed, are made in the form of pipes arranged concentrically inside each other, with the dielectric 5 located between these pipes.
  • the external electrode 1 is connected, by means of an insulated cable 3, with a high voltage power source 2, whose other pole is grounded, while the internal electrode 4 is likewise grounded.
  • the material supply or feed line is made of insulating material.
  • Electrode 1 which is opposite the material supply or feed line, joins a nozzle-shaped spray head 6 through which the material to be sprayed is conveyed. This material has previously been charged, while inside the spiral groove of dielectric 5, by means of the force field created in this groove between the two electrodes 1 and 4.
  • a portion of the length of the external electrode 1 is surrounded by a housing 12 which is made of insulating material and which, with electrode 1, forms an annular duct having an inlet 13 for compressed air.
  • the end of the housing 12 adjacent the spray head 6 has an opening which leaves a ring-shaped crack or annular opening 14 around the spray head 6. Through this crack or opening 14 on the edge of the spray head 6, an air current, supplied from inlet duct 13, exits from the housing 12, whereby velocity of the spraying of the material out of the spraying head 6 is further increased.
  • the spraying material which is supplied under pressure through the supply or feed line 7 travels through the device, going toward the latters exit end 9, along a relatively long spiral path between the two electrodes 1 and 4 which are placed concentrically inside each other and between which there is a strong force field. This guarantees extraordinarily uniform and extremely strong charging of the material even prior to spraying, so that this charged material, after leaving the spraying device, can be precipitated or deposited in an even layer thickness on the object to be sprayed or coated.
  • the mate rial is atomized as it comes out of the spraying head. If the material supplied to the spraying head has a relatively low pressure, atomization is accomplished with the compressed air which comes out of the housing 12 through the ring-shaped crack or opening 14 along the circumference of the spraying head.
  • the material which is to be atomized and which is to be electrically charged, flows via the introduction line 17 and the intermediate duct 7 toward the supply duct 8.
  • a valve 19, to be activated with a pushbutton or handle 20 is arranged between the introduction line 17 and the adjoining intermediate duct 7.
  • the atomization air in this equipment unit moves via the supply or feed pipe 16 to pipe 13.
  • a valve 18 which can be operated by means of pushbutton or handle 20.
  • the pushbutton 20 is depressed to open the connections between ducts 7 and 17, respectively, and between pipes 13 and 16 respectively.
  • the material to be sprayed, streaming into duct 17 reaches the influx duct 3 via intermediate duct 7.
  • the influx duct 6 is surrounded by a dielectric 5 which is arranged inside a pipe-shaped elecn'ode 4 which is wounded via the handle 15 of the equipment.
  • this electrode 1 and the external electrode 4 a strong force field is developed in the supply duct 6 and through this force field the material to be sprayed, which flows in this duct toward sprayer head 6, is evenly charged.
  • this material which reaches spray head 6, is, at the latters exit end 9, atomized either through the material pressure itself or by means of compressed air which is supplied via pipes 16 and 13 and adjoining annular shaped duct 21, which terminates into a ring-shaped exit crack or opening 14 which extends around the spray head 6.
  • the annular shaped duct 21 and the exit opening 14 are formed by the cylindrical housing 12 which surrounds the external electrode 4 along a portion of its length.
  • the electrostatically charged material thus atomized, then streams via a spraying space or chamber 10 toward the object 11 to be sprayed, which is not shown in FIG. 3, which has the same potential as electrode 4, thus resulting in a uniformly and densily deposit of material.
  • Cylindrical housing 12 is attached to a grounded handle 15 which makes it possible to operate this equipment completely without any danger of electric shock.
  • electrode 1 can be made shorter than the counter-electrode 4 or can be spaced further from the exit end of the supply duct on the spray head than the counterelectrode because the conductor or semi-conductor, which is in contact with electrode 1, assures the desired charge along the supply duct 6 in combination with the longer counterelectrode. This shortening of the length of electrode 1 or increasing the spring from the exit end of the supply duct on the spray head results in even greater safety, especially in terms of the potential spark hazard.
  • a device for electrostatically charging and spray ing material on an object having an opposite electrical charge comprising a spraying head, a supply duct for supplying the material to be sprayed to the spraying head, an electrode connected to a high voltage source for obtaining an electrical charge from said high voltage source, the electrical charge of said electrode being opposite the charge of the object being sprayed, said electrode which is oppositely charged with respect to the object to be sprayed being positioned opposite a counter-electrode at a small spaced-apart interval therebetween, wherein one of said electrode or counter-electrode is covered with a dielectric, the dielectric facing toward the opposite electrode and wherein said electrode and counter-electrode form a condenser through which the sprinkling material is conducted, said condenser being positioned in front of the spraying head inside the supply duct for the material.
  • a device wherein the electrode connected to the high-voltage source and which is oppositely charged by this source with respect to the object to be sprayed, is positioned a greater distance from the exit end of the supply duct on the sprinkler head than the counter-electrode of the condenser which is opposite it.
  • a device according to claim 1 wherein said electrode and counter-electrode of the condenser are comprised of pipes positioned concentrically, one inside the other, the supply duct for the material to be sprayed being formed by the space between said two pipes, said two pipes being further separated by a dielectric.
  • a device wherein the supply duct for the material to be sprayed is formed spirally between the two pipe electrodes arranged concentrically inside each other.
  • a device wherein said supply duct for the material to be sprayed formed spirally between the two pipe electrodes arranged concentrically inside each other, consist of a groove which is spirally 4.
  • the supply 10 formed in the dielectric between said two pipe elecduct for the material to be sprayed is formed cylindrically between the two pipe electrodes arranged controdes.

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  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
US00165606A 1970-07-31 1971-07-23 Method and device for electrostatic spraying of material Expired - Lifetime US3735925A (en)

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HUHA000893 1970-07-31

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US (1) US3735925A (ru)
JP (1) JPS5210891B1 (ru)
AT (1) AT313444B (ru)
BE (1) BE767389A (ru)
BG (1) BG28245A3 (ru)
CA (1) CA926711A (ru)
CH (1) CH523720A (ru)
CS (1) CS159280B2 (ru)
DE (1) DE2059594C3 (ru)
DK (1) DK137527B (ru)
ES (2) ES391917A1 (ru)
FR (1) FR2095001A5 (ru)
GB (1) GB1335071A (ru)
NL (1) NL147050B (ru)
RO (1) RO89397A (ru)
SE (1) SE376553B (ru)
SU (1) SU470947A3 (ru)
YU (1) YU34852B (ru)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888207A (en) * 1972-07-24 1975-06-10 Erwin Stutz Device for coating objects with pulverized or granular particles or flakes or fibres
US3985297A (en) * 1974-07-10 1976-10-12 Onoda Cement Company, Ltd. Powder painting apparatus
US4027050A (en) * 1975-07-10 1977-05-31 Frederic David Haig Method and apparatus for electrostatic coating
US4039145A (en) * 1974-09-06 1977-08-02 Air-Industrie Electrostatic powdering nozzle
US4139155A (en) * 1977-05-25 1979-02-13 Nordson Corporation Electrostatic spray gun with isolating paint conduit
US4171100A (en) * 1976-11-10 1979-10-16 Hajtomuvek Es Festoberendezesek Gyara Electrostatic paint spraying apparatus
US4205108A (en) * 1976-05-13 1980-05-27 Firma Carl Freudenberg Surface finished fabric
WO1982001481A1 (en) * 1980-10-24 1982-05-13 Ronald P Hansen Dust mitigation system
US4597534A (en) * 1981-04-24 1986-07-01 Jan Ruud Powder spray with the ability to charge electrostatically
US4814788A (en) * 1986-07-14 1989-03-21 Imperial Chemical Industries Plc Multi-jet ink jet printer
US4830872A (en) * 1985-09-03 1989-05-16 Sale Tilney Technology Plc Electrostatic coating blade and method of applying a thin layer of liquid therewith onto an object
US5011085A (en) * 1987-04-28 1991-04-30 Ac Greiff Ytbehandling Ab Apparatus in a powder sprayer
US5176321A (en) * 1991-11-12 1993-01-05 Illinois Tool Works Inc. Device for applying electrostatically charged lubricant
WO1996011061A1 (en) * 1994-10-05 1996-04-18 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
US20040016832A1 (en) * 1997-08-29 2004-01-29 Schroeder Joseph G. Spray gun
US20050035229A1 (en) * 2003-08-12 2005-02-17 Jesse Zhu Method and apparatus for dispensing paint powders for powder coatings
US20070095550A1 (en) * 2005-11-02 2007-05-03 Tien Sung Kuo Apparatus and method for three-dimensionally planting pile
US20080283636A1 (en) * 2003-04-07 2008-11-20 Aerstream Technologhy Limited Spray Electrode
US20090289132A1 (en) * 2005-11-15 2009-11-26 Matsushita Electric Works, Ltd. Electrostatically atomizing device and electrostatically atomizing system
US20110006139A1 (en) * 2008-02-27 2011-01-13 Yukihiro Masuda Electrostatic atomizing device
US20110254444A1 (en) * 2008-12-23 2011-10-20 Sudo Premium Engineering Co., Ltd. High-voltage circuit insertion-type discharge element
WO2013018477A1 (en) 2011-07-29 2013-02-07 Sumitomo Chemical Company, Limited Electrostatic atomizer, and method for electrostatically atomizing by use of the same
US20150017340A1 (en) * 2012-01-27 2015-01-15 Durr Systems Gmbh Painting booth coating agent line and manufacturing method for a coating agent line
CN107413543A (zh) * 2017-08-24 2017-12-01 农业部南京农业机械化研究所 感应式静电喷头
US20230112751A1 (en) * 2020-03-05 2023-04-13 Politecnico Di Milano System for the deposition of microparticles

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DE2264386C2 (de) * 1971-11-02 1982-04-22 Nordson Corp., 44001 Amherst, Ohio Elektrostatische Sprühpistole
BE790830A (fr) * 1971-11-02 1973-02-15 Nordson Corp Pulverisateur electrostatique
SE411724B (sv) * 1976-10-26 1980-02-04 Sandell Bertil Sett och anordning for att en luftstrom tillfora material till ett munstycke
HU181198B (en) * 1980-10-15 1983-06-28 Jozsef Toth Electroacoustic paint sprayer
US4489894A (en) * 1981-02-27 1984-12-25 National Research Development Corporation Inductively charged spraying apparatus
EP0121288B1 (en) * 1983-01-06 1989-05-17 National Research Development Corporation Electrostatic spray head
GB8305865D0 (en) * 1983-03-03 1983-04-07 British Res Agricult Eng Electrostatic sprayers
WO1992011950A1 (en) * 1991-01-11 1992-07-23 Jason Industries Limited Powder fluidising system

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US2858798A (en) * 1957-02-06 1958-11-04 John J Sedlacsik Electrostatic coating apparatus utilizing both direct current and alternating current to supply current to successive discs
US3352285A (en) * 1964-06-12 1967-11-14 Int Standard Electric Corp Apparatus for applying ring-shaped markings to electric current conductors
US3587967A (en) * 1970-01-08 1971-06-28 Ransburg Electro Coating Corp Spray coating apparatus
US3604980A (en) * 1970-05-25 1971-09-14 Mead Corp Drop-charging apparatus
US3630441A (en) * 1970-10-30 1971-12-28 Tunzini Sames Electrostatic spraying apparatus

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US2858798A (en) * 1957-02-06 1958-11-04 John J Sedlacsik Electrostatic coating apparatus utilizing both direct current and alternating current to supply current to successive discs
US3352285A (en) * 1964-06-12 1967-11-14 Int Standard Electric Corp Apparatus for applying ring-shaped markings to electric current conductors
US3587967A (en) * 1970-01-08 1971-06-28 Ransburg Electro Coating Corp Spray coating apparatus
US3604980A (en) * 1970-05-25 1971-09-14 Mead Corp Drop-charging apparatus
US3630441A (en) * 1970-10-30 1971-12-28 Tunzini Sames Electrostatic spraying apparatus

Cited By (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888207A (en) * 1972-07-24 1975-06-10 Erwin Stutz Device for coating objects with pulverized or granular particles or flakes or fibres
US3985297A (en) * 1974-07-10 1976-10-12 Onoda Cement Company, Ltd. Powder painting apparatus
US4039145A (en) * 1974-09-06 1977-08-02 Air-Industrie Electrostatic powdering nozzle
US4027050A (en) * 1975-07-10 1977-05-31 Frederic David Haig Method and apparatus for electrostatic coating
US4205108A (en) * 1976-05-13 1980-05-27 Firma Carl Freudenberg Surface finished fabric
US4171100A (en) * 1976-11-10 1979-10-16 Hajtomuvek Es Festoberendezesek Gyara Electrostatic paint spraying apparatus
US4139155A (en) * 1977-05-25 1979-02-13 Nordson Corporation Electrostatic spray gun with isolating paint conduit
WO1982001481A1 (en) * 1980-10-24 1982-05-13 Ronald P Hansen Dust mitigation system
US4597534A (en) * 1981-04-24 1986-07-01 Jan Ruud Powder spray with the ability to charge electrostatically
US4830872A (en) * 1985-09-03 1989-05-16 Sale Tilney Technology Plc Electrostatic coating blade and method of applying a thin layer of liquid therewith onto an object
US4814788A (en) * 1986-07-14 1989-03-21 Imperial Chemical Industries Plc Multi-jet ink jet printer
US5011085A (en) * 1987-04-28 1991-04-30 Ac Greiff Ytbehandling Ab Apparatus in a powder sprayer
US5176321A (en) * 1991-11-12 1993-01-05 Illinois Tool Works Inc. Device for applying electrostatically charged lubricant
WO1996011061A1 (en) * 1994-10-05 1996-04-18 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
US5518546A (en) * 1994-10-05 1996-05-21 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
EP0789625A1 (en) * 1994-10-05 1997-08-20 eNexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
AU707667B2 (en) * 1994-10-05 1999-07-15 Enexus Corporation Apparatus for coating substrates with inductively charged resinous powder particles
EP0789625A4 (en) * 1994-10-05 2000-12-27 Enexus Corp APPARATUS FOR COATING INDUCTIVE LOADED RESIN POWDER PARTICLE SUBSTRATES
CN1071598C (zh) * 1994-10-05 2001-09-26 E-系列公司 用感应充电的粉末颗粒涂敷基底的装置和方法
KR100390641B1 (ko) * 1994-10-05 2003-10-23 넥서스 코포레이션 유도충전된수지성분말입자로기판을코팅하는장치
US20040016832A1 (en) * 1997-08-29 2004-01-29 Schroeder Joseph G. Spray gun
US20080283636A1 (en) * 2003-04-07 2008-11-20 Aerstream Technologhy Limited Spray Electrode
US8490898B2 (en) * 2003-04-07 2013-07-23 Atrium Innovation, Limited Spray electrode
US20050035229A1 (en) * 2003-08-12 2005-02-17 Jesse Zhu Method and apparatus for dispensing paint powders for powder coatings
US7240861B2 (en) * 2003-08-12 2007-07-10 The University Of Western Ontario Method and apparatus for dispensing paint powders for powder coatings
US20070095550A1 (en) * 2005-11-02 2007-05-03 Tien Sung Kuo Apparatus and method for three-dimensionally planting pile
US7488387B2 (en) * 2005-11-02 2009-02-10 Tien Sung Kuo Apparatus and method for three-dimensionally planting pile
US20090289132A1 (en) * 2005-11-15 2009-11-26 Matsushita Electric Works, Ltd. Electrostatically atomizing device and electrostatically atomizing system
US8511590B2 (en) * 2005-11-15 2013-08-20 Panasonic Corporation Electrostatically atomizing device and electrostatically atomizing system
US8453952B2 (en) * 2008-02-27 2013-06-04 Panasonic Corporation Electrostatic atomizing device
US20110006139A1 (en) * 2008-02-27 2011-01-13 Yukihiro Masuda Electrostatic atomizing device
CN102265379A (zh) * 2008-12-23 2011-11-30 须藤优质工程有限公司 高压电路插入型放电元件
US20110254444A1 (en) * 2008-12-23 2011-10-20 Sudo Premium Engineering Co., Ltd. High-voltage circuit insertion-type discharge element
US8604694B2 (en) * 2008-12-23 2013-12-10 Sudo Premium Engineering Co., Ltd. Discharge device having high-voltage circuit unit installed therein
WO2013018477A1 (en) 2011-07-29 2013-02-07 Sumitomo Chemical Company, Limited Electrostatic atomizer, and method for electrostatically atomizing by use of the same
KR20140046020A (ko) 2011-07-29 2014-04-17 스미또모 가가꾸 가부시끼가이샤 정전 분무 장치 및 그 정전 분무 장치를 이용하여 정전 분무를 하는 방법
US10179338B2 (en) 2011-07-29 2019-01-15 Sumitomo Chemical Company, Limited Electrostatic atomizer, and method for electrostatically atomizing by use of the same
US20150017340A1 (en) * 2012-01-27 2015-01-15 Durr Systems Gmbh Painting booth coating agent line and manufacturing method for a coating agent line
US10137463B2 (en) * 2012-01-27 2018-11-27 Durr Systems Gmbh Coating agent line with grounding element
CN107413543A (zh) * 2017-08-24 2017-12-01 农业部南京农业机械化研究所 感应式静电喷头
CN107413543B (zh) * 2017-08-24 2023-07-21 农业部南京农业机械化研究所 感应式静电喷头
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Also Published As

Publication number Publication date
JPS5210891B1 (ru) 1977-03-26
DE2059594A1 (de) 1972-02-10
ES194085U (es) 1974-11-16
CH523720A (de) 1972-06-15
GB1335071A (en) 1973-10-24
NL7106488A (ru) 1972-02-02
SU470947A3 (ru) 1975-05-15
SE376553B (ru) 1975-06-02
BG28245A3 (en) 1980-03-25
DK137527C (ru) 1978-09-04
CA926711A (en) 1973-05-22
BE767389A (fr) 1971-10-18
RO89397A (ro) 1986-06-30
DK137527B (da) 1978-03-20
DE2059594C3 (de) 1973-09-20
DE2059594B2 (de) 1973-02-22
ES194085Y (es) 1975-03-01
ES391917A1 (es) 1974-06-16
NL147050B (nl) 1975-09-15
AT313444B (de) 1974-02-25
CS159280B2 (ru) 1974-12-27
FR2095001A5 (ru) 1972-02-04
YU34852B (en) 1980-04-30
YU112371A (en) 1979-10-31

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