EP0037910A1 - Procédé et dispositif de pulvérisation de poudre - Google Patents

Procédé et dispositif de pulvérisation de poudre Download PDF

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Publication number
EP0037910A1
EP0037910A1 EP81101916A EP81101916A EP0037910A1 EP 0037910 A1 EP0037910 A1 EP 0037910A1 EP 81101916 A EP81101916 A EP 81101916A EP 81101916 A EP81101916 A EP 81101916A EP 0037910 A1 EP0037910 A1 EP 0037910A1
Authority
EP
European Patent Office
Prior art keywords
powder
additional gas
gas outlet
channel
flow
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.)
Granted
Application number
EP81101916A
Other languages
German (de)
English (en)
Other versions
EP0037910B1 (fr
Inventor
Kurt Moos
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Priority to AT81101916T priority Critical patent/ATE4291T1/de
Publication of EP0037910A1 publication Critical patent/EP0037910A1/fr
Application granted granted Critical
Publication of EP0037910B1 publication Critical patent/EP0037910B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials

Definitions

  • the invention relates to a method and a device for atomizing powder, in particular for coating objects, by introducing gas atomizing the powder when the powder is ejected from an atomizer opening.
  • the object of the invention is to achieve the atomization (more uniform powder concentration and more favorable speed of the powder particles in the atomizer jet or the atomizing cloud) and thus to improve the coating, to achieve fewer rejects of coated objects and less powder losses (scattering and ricocheting powder particles) during the coating process.
  • a device for atomizing powder, in particular for coating objects, with an atomizer nozzle at the end of a powder channel and with an atomizer gas outlet at the atomizer nozzle is characterized in accordance with the invention in that an additional gas outlet opens into the powder channel in such a way that that additional gas supplied by him pushes the powder particles radially outwards in the powder channel, and that the additional gas outlet is arranged so far upstream of the atomizer gas outlet that a powder flow in the axial direction between the additional gas outlet and atomizer gas outlet results in an increasingly stronger powder concentration radially from the inside to the outside Has.
  • the outlet of the additional gas is thus designed so that it exerts a cyclone effect on the powder arriving in the powder channel.
  • the additional gas outlet must therefore be arranged so far upstream of the atomizer gas outlet that this cyclone effect can develop fully.
  • the powder which is forced radially outwards is better grasped by the atomizing gas and atomized into a powder jet which is more uniform in its concentration or a powder cloud which is more uniform in its concentration than is possible with the previously proposed methods and devices.
  • this powder has a better electrostatic charge. This in turn leads to better atomization and stronger attraction, such as better adhesion to the object to be coated.
  • the additional gas of the invention exerts a conveying effect on the powder particles and a suction is formed in the powder flow, similar to a Venturi nozzle.
  • a suction is formed in the powder flow, similar to a Venturi nozzle.
  • the drawing shows a powder atomizing device for coating objects. It consists of an atomizer part 1 and an additional part 2. Both together form a device.
  • the Atomizer part 1 can also be a so-called spray gun, to which the additional part 2 is attached upstream.
  • a powder channel 3 leads axially through both.
  • the front end of the atomizer part 1 forms an atomizer nozzle 4.
  • An atomizer outlet 5 opens into it and is supplied by an atomizer gas channel 6 with atomizer gas, preferably air. Thread-like windings 7 of the atomizer gas channel 6 let the atomizer gas discharge into the powder stream essentially tangentially and obliquely in the flow direction of the powder of the channel 3.
  • Another gas channel 8 opens out in the form of an annular slot 9 surrounding the nozzle 4.
  • the gas, usually air, of the ring slot serves to form a gas jacket which envelops the powder cloud emerging from the nozzle 4 and gives it a specific shape.
  • an additional gas outlet 10 is formed, which is fed by an additional gas channel 11. Thread-like turns 14 allow the additional gas, normally air, to flow essentially tangentially from the additional outlet 10 into the powder channel 3.
  • the walls 15 of the additional gas outlet 11 run obliquely in the flow direction of the powder channel 3, so that the additional gas gives the powder in the channel 3 not only a radially outwardly directed speed component, but also an axial acceleration component.
  • The. Walls 15 of the additional gas outlet 10 are designed to converge in the direction of flow, i.e. they narrow like a nozzle in the direction of flow.
  • Electrodes 16 arranged in the powder channel 3 between the additional gas outlet 10 and the atomizer gas outlet 5 serve to electrostatically charge the powder, as is known per se.
  • the electrodes 16 are fed via leads 17 from a high-voltage source, not shown.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Nozzles (AREA)
EP81101916A 1980-04-12 1981-03-16 Procédé et dispositif de pulvérisation de poudre Expired EP0037910B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81101916T ATE4291T1 (de) 1980-04-12 1981-03-16 Verfahren und vorrichtung zum zerstaeuben von pulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3014133A DE3014133C2 (de) 1980-04-12 1980-04-12 Vorrichtung zum Zerstäuben von Pulver
DE3014133 1980-04-12

Publications (2)

Publication Number Publication Date
EP0037910A1 true EP0037910A1 (fr) 1981-10-21
EP0037910B1 EP0037910B1 (fr) 1983-07-27

Family

ID=6099865

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81101916A Expired EP0037910B1 (fr) 1980-04-12 1981-03-16 Procédé et dispositif de pulvérisation de poudre

Country Status (7)

Country Link
US (1) US4659011A (fr)
EP (1) EP0037910B1 (fr)
JP (1) JPS56158167A (fr)
AT (1) ATE4291T1 (fr)
DE (1) DE3014133C2 (fr)
ES (1) ES501002A0 (fr)
ZA (1) ZA812424B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121320A (en) * 1982-06-03 1983-12-21 Gema Ransburg Ag An atomiser appliance for coating objects with powder
EP0110753A3 (en) * 1982-11-03 1985-10-02 Jose De Fusco Lupo Electrostatic spray-guns
EP0192854A1 (fr) * 1985-02-01 1986-09-03 Ransburg-Gema AG Pistolet de pulvérisation pour matériaux de revêtement

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5227017A (en) * 1988-01-29 1993-07-13 Ohkawara Kakohki Co., Ltd. Spray drying apparatus equipped with a spray nozzle unit
US5106650A (en) * 1988-07-14 1992-04-21 Union Carbide Chemicals & Plastics Technology Corporation Electrostatic liquid spray application of coating with supercritical fluids as diluents and spraying from an orifice
US5499768A (en) * 1989-05-31 1996-03-19 Ohkawara Kakohki Co., Ltd. Spray nozzle unit
JP2548380Y2 (ja) * 1990-09-28 1997-09-17 株式会社テネックス パッキン付の箱状体
DE19614192A1 (de) * 1996-04-10 1997-10-16 Abb Research Ltd Dispergiersystem für eine Pulversprüheinrichtung
US6053420A (en) * 1996-04-10 2000-04-25 Abb Research Ltd. Dispersion apparatus and process for producing a large cloud of an electrostatically charged powder/air mixture
US5850976A (en) * 1997-10-23 1998-12-22 The Eastwood Company Powder coating application gun and method for using the same
US20040011901A1 (en) * 2000-07-10 2004-01-22 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US20030038193A1 (en) * 2000-07-11 2003-02-27 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
US20020121240A1 (en) 2000-07-11 2002-09-05 Rehman William R. Unipolarity powder coating systems including improved tribocharging and corona guns
DE10138917A1 (de) * 2001-08-08 2003-03-06 Itw Gema Ag Pulversprühbeschichtungsvorrichtung
US20040159282A1 (en) * 2002-05-06 2004-08-19 Sanner Michael R Unipolarity powder coating systems including improved tribocharging and corona guns
DE102005045176A1 (de) * 2005-09-21 2007-03-22 Ramseier Technologies Ag Applikator
US7827929B2 (en) * 2007-02-23 2010-11-09 Frito-Lay North America, Inc. Pneumatic seasoning system
DE202007018809U1 (de) 2007-08-31 2009-05-14 Itw Gema Gmbh Pulversprühbeschichtungsvorrichtung und Beschichtungspulver-Fördervorrichtung dafür
CN107262320B (zh) * 2017-06-26 2023-08-29 中信戴卡股份有限公司 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1777284A1 (de) * 1961-12-08 1971-07-29 Tunzini Sames Zerstaeuberduese an einer elektrostatischen Auftragsvorrichtung fuer Pulver
FR2114662A7 (fr) * 1970-11-12 1972-06-30 Volstatic Coatings Ltd
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
GB2029271A (en) * 1978-09-01 1980-03-19 Onoda Cement Co Ltd Electrostatic powder spraying apparatus
BE880394A (fr) * 1978-12-04 1980-04-01 Gema A G Appbau Procede et dispositif de pulverisation en particulier, pour une matiere d'enduction pulverulente
DE2914960B1 (de) * 1979-04-12 1980-10-16 Gema Ag Appbau Verfahren und Vorrichtung zum Spruehbeschichten des Inneren von eine Naht aufweisenden rohrfoermigen Koerpern

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1814809A1 (de) * 1968-12-14 1970-07-30 Mueller Ernst Fa Verfahren und Vorrichtung zum Bestaeuben von Gegenstaenden mit Pulver
US3873024A (en) * 1971-08-13 1975-03-25 Ransburg Corp Apparatus for spraying a plurality of different powders
SE438966B (sv) * 1978-12-04 1985-05-28 Gema Ransburg Ag Sprutanordning for pulver, med i munstycksoppningen tangentiellt inledd spridningsgas

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1777284A1 (de) * 1961-12-08 1971-07-29 Tunzini Sames Zerstaeuberduese an einer elektrostatischen Auftragsvorrichtung fuer Pulver
FR2114662A7 (fr) * 1970-11-12 1972-06-30 Volstatic Coatings Ltd
US4090666A (en) * 1976-05-19 1978-05-23 Coors Container Company Gun for tribo charging powder
DE2756009A1 (de) * 1976-05-19 1979-06-28 Coors Container Co Pistole zur reibungselektrischen aufladung von pulver
GB2029271A (en) * 1978-09-01 1980-03-19 Onoda Cement Co Ltd Electrostatic powder spraying apparatus
BE880394A (fr) * 1978-12-04 1980-04-01 Gema A G Appbau Procede et dispositif de pulverisation en particulier, pour une matiere d'enduction pulverulente
DE2852412A1 (de) * 1978-12-04 1980-06-12 Gema Ag Zerstaeubungseinrichtung fuer pulver zum beschichten
DE2914960B1 (de) * 1979-04-12 1980-10-16 Gema Ag Appbau Verfahren und Vorrichtung zum Spruehbeschichten des Inneren von eine Naht aufweisenden rohrfoermigen Koerpern

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2121320A (en) * 1982-06-03 1983-12-21 Gema Ransburg Ag An atomiser appliance for coating objects with powder
EP0110753A3 (en) * 1982-11-03 1985-10-02 Jose De Fusco Lupo Electrostatic spray-guns
EP0192854A1 (fr) * 1985-02-01 1986-09-03 Ransburg-Gema AG Pistolet de pulvérisation pour matériaux de revêtement
US4702420A (en) * 1985-02-01 1987-10-27 Ransburg-Gema Ag Spray gun for coating material

Also Published As

Publication number Publication date
ZA812424B (en) 1983-02-23
ES8201848A1 (es) 1982-01-01
ES501002A0 (es) 1982-01-01
JPS56158167A (en) 1981-12-05
US4659011A (en) 1987-04-21
EP0037910B1 (fr) 1983-07-27
DE3014133A1 (de) 1981-10-15
ATE4291T1 (de) 1983-08-15
DE3014133C2 (de) 1984-04-19

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