US3903321A - Method for charging plastic powder electrostatically by friction only - Google Patents

Method for charging plastic powder electrostatically by friction only Download PDF

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Publication number
US3903321A
US3903321A US325231A US32523173A US3903321A US 3903321 A US3903321 A US 3903321A US 325231 A US325231 A US 325231A US 32523173 A US32523173 A US 32523173A US 3903321 A US3903321 A US 3903321A
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United States
Prior art keywords
powder
epoxide
polytetrafluoro ethylene
air
mixing
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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
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US325231A
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English (en)
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Hans J Schaad
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Individual
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Individual
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Publication of US3903321A publication Critical patent/US3903321A/en
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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
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1691—Apparatus to be carried on or by a person or with a container fixed to the discharge device
    • 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
    • Y10S239/00—Fluid sprinkling, spraying, and diffusing
    • Y10S239/19—Nozzle materials

Definitions

  • plastic material powder onto articles by means of accelerated air streams, whereby the particles of the plastic material powder are subjected to an electrostatic charge by an electrical field, so that they settle on the grounded or oppositely charged article because of the electrical attraction.
  • the layer of plastic material powder Upon baking, the layer of plastic material powder provides a surface coating being superior to conventional lacquer coatings.
  • this object is solved in that the plastic material powder is electrostatically charged by friction against polytetrafluoro ethylene (PTFE), and then sprayed onto the article to be coated.
  • PTFE polytetrafluoro ethylene
  • the object according to the invention is solved in that the plastic material powder, after the selfcharging by mutual friction between the plastic material particles and/or with the nozzle walls, is further passed through highly insulating materials only which, preferably, have a very high resistivity of about from to 10 ohms per centimeter.
  • the good coating according to the invention can be obtained not only by using polytetrafluoro ethylene, but that, further, polytrifluoro monochloroethylene and other fluoro compounds and solid, highly insulating materials, such as amber, mica and quartz glass, may be employed.
  • Prior condition for the usability is, on the one hand, a high insulating effect which substantially exceeds the insulating effect of e.g. standard glass and the like, and, on the other hand, a surface consistency which safely prevents the plastic material powder from adhering thereto. Additionally, the material must be chemically inert towards the plastic material powder, too.
  • FIG. 1 schematically shows in sectional view an apparatus for discharging electrostatically charged plastic material powder, whereby the powder reservoir is attached directly to the jet pipe.
  • FIG. 2a pistol for the powder coating of articles according to FIG. 1 and FIG. 3a pistol according to FIG. 2 but without having the powder supply attached to the pistol.
  • the powder spraying apparatus comprises primarily a jet pipe I and a mixing section 2 positioned upstream thereof, both components being formed of polytetrafluoro ethylene.
  • the jet pipe 1 per se may consist of a nozzle portion Ic having a subsequent expansion portion lb which is followed by the actual spray pipe la.
  • the spray pipe Ia may merges with a diffusor 7 wherein the velocity of the outflowing powder/air mixture is lowered, and includes a perforated plate 6 which is likewise formed of polytetrafluoro ethylene and which provides a uniform flow distribution.
  • the powder enters the mixing portion 2 which preferably is a cylindrical chamber, via a passage 8.
  • the passage 8 may be either directly surrounded by a powder reservoir 9, (FIGv 2), or the powder may be fed thereto over a certain distance (FIG. 3).
  • the rear wall of the mixing or distributor section 2 includes an opening into which a nozzle housing 4 opens.
  • the nozzle housing which likewise consists of polytetrafluoro ethylene, has a nozzle needle passing coaxially therethrough, whereby the quantity of the entering air may be controlled by the position of this needle.
  • the apparatus according to the invention may be formed either as a hand spray gun by being provided with a handle 11 or it may be positioned with some distance from the powder reservoir either stationarily or so as to be movable (FIG. 3).
  • the selfcharging of the powder particles renders possible both a polarization and an ionization of the powder particles in ideal combination, so that, when selecting high flow velocities, high thicknesses of the coating in comparison with conventional coating methods may be obtained.
  • the deposition of the powder particles may be controlled, so that smaller layer thicknesses may be adjusted, too.
  • Epoxide resin is particularly useful for the processing in accordance with the present method. It has been housing. In case of the pistol according to FIG. 3, where coating powder is supplied via tube 8, the control of the powder supply is effected by switch 16 as well.
  • Epoxide +1.5 1 +1 1 +0.5 2 4 3 (1.5 2 0 4 0 4 (1 4 0 5 Standard Epoxide +2 1 +1.5 2 0 3 o 4 0 3 o 3 0 3 0 3 o 3 0 5 Graphite Epoxide +1 1 +1 2 +1 2 o 4 o 4 0 3 o 4 0 5 0 3 0 5 Black Epoxide +1 1 +1 2 +0.5 3 0 3 o 4 0.5 2 o 4 o 5 0 o 5 Metal Epoxide +2.5 1 +0.5 2 +1.5 1 +0.5 2 +0.5 2 +1 1 0 3 0 3 o 3 (1 5 White Polyester Thermoplast +0.5 4 +l.
  • a method of coating articles with an epoxide pow der within an electrostatic field without applying an external charge to the article comprising the steps of: mixing the epoxide powder in a stream of pressurized air within a mixing section of polytetrafluoro ethylene, accelerating the air and powder stream to supersonic velocity through a venturi device of polytetrafluoro ethylene, electrostatically charging the material powder solely by friction of the material flowing against the polytetrafluoro ethylene in said venturi device, passing the charged powder through a spray device having a surface of polytetrafluoro ethylene to prevent dissipaand spraying the clectrostatically charged epoxide powder from the spray device onto the article to be coated.
  • a method in accordance with claim 1 including the step of: grounding a nozzle from which the spray is discharged.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
US325231A 1972-01-25 1973-01-22 Method for charging plastic powder electrostatically by friction only Expired - Lifetime US3903321A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2203351A DE2203351B1 (de) 1972-01-25 1972-01-25 Verfahren und Vorrichtung zur Beschichtung von Gegenstaenden mit Kunststoffpulver

Publications (1)

Publication Number Publication Date
US3903321A true US3903321A (en) 1975-09-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
US325231A Expired - Lifetime US3903321A (en) 1972-01-25 1973-01-22 Method for charging plastic powder electrostatically by friction only

Country Status (6)

Country Link
US (1) US3903321A (cs)
JP (1) JPS5551628B2 (cs)
DE (1) DE2203351B1 (cs)
DK (1) DK139184C (cs)
FR (1) FR2169612A5 (cs)
GB (1) GB1422262A (cs)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020393A (en) * 1975-07-16 1977-04-26 Estey Dynamics Corporation Electrogasdynamic coating device having composite non-conductive flow channel, and hollow ionization electrode for an air jet
US4071192A (en) * 1976-03-29 1978-01-31 Coors Container Company Tribo-electro-gas-dynamic powder charging apparatus
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
US4109861A (en) * 1976-09-16 1978-08-29 Solar Suede Corporation Electrostatic flocking system
JPS5415062U (cs) * 1977-07-05 1979-01-31
DE2905223A1 (de) * 1978-02-13 1979-08-16 Nordson Corp Vorrichtung und verfahren zur elektrostatischen spruehbeschichtung
DE2816850A1 (de) * 1978-04-18 1979-10-31 Mueller Ernst & Co Elektrostatische pulver-spruehpistole
US4183974A (en) * 1974-01-02 1980-01-15 W. R. Grace & Co. Container coating method
US4225090A (en) * 1979-09-07 1980-09-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for painting by electrostatic powder spraying
US4233335A (en) * 1979-03-06 1980-11-11 Etlin Vladimir N Electrostatic coating method
US4359192A (en) * 1978-09-26 1982-11-16 Toyota Jidosha Kogyo Kabushiki Kaisha Triboelectric powder spraying gun
US4630777A (en) * 1984-02-27 1986-12-23 Nordson Corporation Powder spray gun
US4706890A (en) * 1985-04-22 1987-11-17 Ransburg-Gema Ag Method and apparatus for electrostatic coating of articles with powdered coating material
US4765544A (en) * 1986-01-16 1988-08-23 Kopperschmidt-Mueller Gmbh & Co. Kg Electrostatic spray gun
US4798340A (en) * 1986-01-14 1989-01-17 Esb Elektrostatische Spruh- Und Beschichtungsanlagen G.F. Vohringer Gmbh Electrostatic device for powder spraying with triboelectric powder charging
US4798338A (en) * 1984-02-08 1989-01-17 Veb Infrarot-Anlagen Oranienburg Apparatus for the electro-kinetic charging of powdered materials
US4886215A (en) * 1985-10-18 1989-12-12 Nordson Corporation Hand operated powder spray pistol
US5344082A (en) * 1992-10-05 1994-09-06 Nordson Corporation Tribo-electric powder spray gun
DE4312262A1 (de) * 1993-04-15 1994-10-20 Gema Volstatic Ag Elektrostatische Sprühvorrichtung
US5552191A (en) * 1992-02-14 1996-09-03 Morton International, Inc. Triboelectric coating powder and process
US5731043A (en) * 1992-02-14 1998-03-24 Morton International, Inc. Triboelectric coating powder and procees for coating wood substrates
US5811158A (en) * 1996-04-25 1998-09-22 Kao Corporation Method and apparatus for electrostatic powder coating
US5885351A (en) * 1997-02-18 1999-03-23 Pfs Thermoplastic Powder Coatings, Inc. Tribocharge applicator device
US5997959A (en) * 1994-10-06 1999-12-07 Societe Lcs International Method and apparatus for electrostatically painting parts made of dielectric or low-conductivity material
US6156392A (en) * 1999-07-13 2000-12-05 Nylok Fastener Corporation Process for triboelectric application of a fluoropolymer coating to a threaded fastener
US6202945B1 (en) 1997-04-22 2001-03-20 Kao Corporation Method and apparatus for electrostatic powder coating
US20030141393A1 (en) * 2002-01-29 2003-07-31 Keudell Leopold Von Electrostatic powder spray device
US6645300B2 (en) 2000-07-11 2003-11-11 Nordson Corporation Unipolarity powder coating systems including improved tribocharging and corona guns
US20040011901A1 (en) * 2000-07-10 2004-01-22 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US20040159282A1 (en) * 2002-05-06 2004-08-19 Sanner Michael R Unipolarity powder coating systems including improved tribocharging and corona guns
US20040251327A1 (en) * 2000-07-11 2004-12-16 Messerly James W. Unipolarity powder coating systems including tribocharging and corona gun combination
CN116421853A (zh) * 2023-06-14 2023-07-14 北京普益盛济科技有限公司 微导管及其制作方法、制作系统及静电粉末喷枪

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5176558U (cs) * 1974-12-13 1976-06-16
US4072129A (en) * 1976-04-27 1978-02-07 National Research Development Corporation Electrostatic powder deposition
FR2484290A2 (fr) * 1979-01-25 1981-12-18 Europ Equip Menager Pistolet de projection electrostatique
FR2447230A1 (fr) * 1979-01-25 1980-08-22 Europ Equip Menager Pistolet de projection electrostatique
NL187729C (nl) * 1980-01-04 1992-01-02 Icab Ind Coating Ab Elektrostatische poederspuit.
FR2488151A1 (fr) * 1980-08-06 1982-02-12 Hebert Jean Claude Diffuseur electrostatique multi-couleurs pour peinture en poudre
JPS6134065Y2 (cs) * 1980-08-29 1986-10-04
DE3430275A1 (de) * 1984-08-17 1986-02-27 Intec Maschinenbau Hans J. Schaad, 4600 Dortmund Verbesserte vorrichtung zur durchfuehrung einer beschichtung von gegenstaenden mit kunststoffpulver
DE3729713A1 (de) * 1987-09-04 1989-03-23 Gema Ransburg Ag Spruehbeschichtungsvorrichtung fuer pulver zum beschichten von gegenstaenden
JPH04255401A (ja) * 1991-02-01 1992-09-10 Kubota Corp 電動車用制御回路の温度保護装置
RU2222385C2 (ru) * 2000-12-13 2004-01-27 Леонов Борис Петрович Устройство для нанесения полимерных порошковых покрытий
DE102006019643B4 (de) * 2006-04-25 2008-09-25 Reinhold Gregarek Vorrichtung zur pneumatischen, tribostatischen Pulverbeschichtung von Werkstücken

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2477947A (en) * 1945-01-30 1949-08-02 Electronic Dusting Corp Method and device for projecting powders carrying electrostatic charges
US2574284A (en) * 1948-03-12 1951-11-06 Prochazka Rudolf Process for the production of high electrostatic charges by self-excitation
US2590534A (en) * 1947-07-23 1952-03-25 Georges Truffaut Ets Apparatus for producing electrified powders by friction
US2657339A (en) * 1953-10-27 Method and apparatus for producing
US2761997A (en) * 1946-10-07 1956-09-04 Magnaflux Corp Apparatus for detecting surface discontinuities
US3339841A (en) * 1965-02-12 1967-09-05 Jr Howard W Beach Electrostatic paint spray gun
US3434859A (en) * 1964-01-07 1969-03-25 Harshaw Chem Ltd Method for depositing a coating on the internal walls of capillary or small-bore tubes
US3507686A (en) * 1967-06-23 1970-04-21 Xerox Corp Method of coating carrier beads
US3521815A (en) * 1969-05-07 1970-07-28 Imre Szasz Guns for the electrostatic spray coating of objects with a powder
US3533835A (en) * 1966-10-11 1970-10-13 Xerox Corp Electrostatographic developer mixture
US3597668A (en) * 1968-10-17 1971-08-03 Goro Fujii Electrostatic charger for liquid fuel by friction
US3630442A (en) * 1969-06-16 1971-12-28 Randburg Electro Coating Corp Electrostatic coating method and apparatus

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657339A (en) * 1953-10-27 Method and apparatus for producing
US2477947A (en) * 1945-01-30 1949-08-02 Electronic Dusting Corp Method and device for projecting powders carrying electrostatic charges
US2761997A (en) * 1946-10-07 1956-09-04 Magnaflux Corp Apparatus for detecting surface discontinuities
US2590534A (en) * 1947-07-23 1952-03-25 Georges Truffaut Ets Apparatus for producing electrified powders by friction
US2574284A (en) * 1948-03-12 1951-11-06 Prochazka Rudolf Process for the production of high electrostatic charges by self-excitation
US3434859A (en) * 1964-01-07 1969-03-25 Harshaw Chem Ltd Method for depositing a coating on the internal walls of capillary or small-bore tubes
US3339841A (en) * 1965-02-12 1967-09-05 Jr Howard W Beach Electrostatic paint spray gun
US3533835A (en) * 1966-10-11 1970-10-13 Xerox Corp Electrostatographic developer mixture
US3507686A (en) * 1967-06-23 1970-04-21 Xerox Corp Method of coating carrier beads
US3597668A (en) * 1968-10-17 1971-08-03 Goro Fujii Electrostatic charger for liquid fuel by friction
US3521815A (en) * 1969-05-07 1970-07-28 Imre Szasz Guns for the electrostatic spray coating of objects with a powder
US3630442A (en) * 1969-06-16 1971-12-28 Randburg Electro Coating Corp Electrostatic coating method and apparatus

Cited By (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183974A (en) * 1974-01-02 1980-01-15 W. R. Grace & Co. Container coating method
US4020393A (en) * 1975-07-16 1977-04-26 Estey Dynamics Corporation Electrogasdynamic coating device having composite non-conductive flow channel, and hollow ionization electrode for an air jet
US4071192A (en) * 1976-03-29 1978-01-31 Coors Container Company Tribo-electro-gas-dynamic powder charging apparatus
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
US4109861A (en) * 1976-09-16 1978-08-29 Solar Suede Corporation Electrostatic flocking system
JPS5415062U (cs) * 1977-07-05 1979-01-31
DE2905223A1 (de) * 1978-02-13 1979-08-16 Nordson Corp Vorrichtung und verfahren zur elektrostatischen spruehbeschichtung
DE2816850A1 (de) * 1978-04-18 1979-10-31 Mueller Ernst & Co Elektrostatische pulver-spruehpistole
US4359192A (en) * 1978-09-26 1982-11-16 Toyota Jidosha Kogyo Kabushiki Kaisha Triboelectric powder spraying gun
US4233335A (en) * 1979-03-06 1980-11-11 Etlin Vladimir N Electrostatic coating method
US4225090A (en) * 1979-09-07 1980-09-30 Toyota Jidosha Kogyo Kabushiki Kaisha Device for painting by electrostatic powder spraying
US4798338A (en) * 1984-02-08 1989-01-17 Veb Infrarot-Anlagen Oranienburg Apparatus for the electro-kinetic charging of powdered materials
US4630777A (en) * 1984-02-27 1986-12-23 Nordson Corporation Powder spray gun
US4706890A (en) * 1985-04-22 1987-11-17 Ransburg-Gema Ag Method and apparatus for electrostatic coating of articles with powdered coating material
US4886215A (en) * 1985-10-18 1989-12-12 Nordson Corporation Hand operated powder spray pistol
US4798340A (en) * 1986-01-14 1989-01-17 Esb Elektrostatische Spruh- Und Beschichtungsanlagen G.F. Vohringer Gmbh Electrostatic device for powder spraying with triboelectric powder charging
US4765544A (en) * 1986-01-16 1988-08-23 Kopperschmidt-Mueller Gmbh & Co. Kg Electrostatic spray gun
US5851607A (en) * 1992-02-14 1998-12-22 Morton International, Inc. Triboelectric coating powder and process for coating wood substrates
US5552191A (en) * 1992-02-14 1996-09-03 Morton International, Inc. Triboelectric coating powder and process
US5637136A (en) * 1992-02-14 1997-06-10 Morton International, Inc. Triboelectric coating powder and process
US5731043A (en) * 1992-02-14 1998-03-24 Morton International, Inc. Triboelectric coating powder and procees for coating wood substrates
US5756164A (en) * 1992-02-14 1998-05-26 Morton International, Inc. Triboelectric coating powder and process
US5344082A (en) * 1992-10-05 1994-09-06 Nordson Corporation Tribo-electric powder spray gun
US5402940A (en) * 1992-10-05 1995-04-04 Nordson Corporation Tribo-electric powder spray gun
DE4312262A1 (de) * 1993-04-15 1994-10-20 Gema Volstatic Ag Elektrostatische Sprühvorrichtung
US5997959A (en) * 1994-10-06 1999-12-07 Societe Lcs International Method and apparatus for electrostatically painting parts made of dielectric or low-conductivity material
US5811158A (en) * 1996-04-25 1998-09-22 Kao Corporation Method and apparatus for electrostatic powder coating
US5885351A (en) * 1997-02-18 1999-03-23 Pfs Thermoplastic Powder Coatings, Inc. Tribocharge applicator device
US6202945B1 (en) 1997-04-22 2001-03-20 Kao Corporation Method and apparatus for electrostatic powder coating
US6156392A (en) * 1999-07-13 2000-12-05 Nylok Fastener Corporation Process for triboelectric application of a fluoropolymer coating to a threaded fastener
US20040011901A1 (en) * 2000-07-10 2004-01-22 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US6645300B2 (en) 2000-07-11 2003-11-11 Nordson Corporation Unipolarity powder coating systems including improved tribocharging and corona guns
US20040251327A1 (en) * 2000-07-11 2004-12-16 Messerly James W. Unipolarity powder coating systems including tribocharging and corona gun combination
US20030141393A1 (en) * 2002-01-29 2003-07-31 Keudell Leopold Von Electrostatic powder spray device
US20040159282A1 (en) * 2002-05-06 2004-08-19 Sanner Michael R Unipolarity powder coating systems including improved tribocharging and corona guns
CN116421853A (zh) * 2023-06-14 2023-07-14 北京普益盛济科技有限公司 微导管及其制作方法、制作系统及静电粉末喷枪
CN116421853B (zh) * 2023-06-14 2023-11-10 北京普益盛济科技有限公司 微导管的制作方法、制作系统及静电粉末喷枪

Also Published As

Publication number Publication date
DK139184B (da) 1979-01-08
DE2203351B1 (de) 1973-08-23
GB1422262A (en) 1976-01-21
DK139184C (da) 1979-06-11
JPS4884130A (cs) 1973-11-08
JPS5551628B2 (cs) 1980-12-25
FR2169612A5 (cs) 1973-09-07

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