EP2050507A1 - Procédé et dispositif destinés au revêtement électrostatique d'une pièce à usiner conductrice de courant électrique à l'aide d'une poudre de revêtement - Google Patents

Procédé et dispositif destinés au revêtement électrostatique d'une pièce à usiner conductrice de courant électrique à l'aide d'une poudre de revêtement Download PDF

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Publication number
EP2050507A1
EP2050507A1 EP07405310A EP07405310A EP2050507A1 EP 2050507 A1 EP2050507 A1 EP 2050507A1 EP 07405310 A EP07405310 A EP 07405310A EP 07405310 A EP07405310 A EP 07405310A EP 2050507 A1 EP2050507 A1 EP 2050507A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
electrode
powder
potential
coating
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.)
Withdrawn
Application number
EP07405310A
Other languages
German (de)
English (en)
Inventor
Kurt Seitz
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.)
J Wagner AG
Original Assignee
J Wagner AG
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 J Wagner AG filed Critical J Wagner AG
Priority to EP07405310A priority Critical patent/EP2050507A1/fr
Priority to US12/250,659 priority patent/US8329258B2/en
Publication of EP2050507A1 publication Critical patent/EP2050507A1/fr
Withdrawn legal-status Critical Current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
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B05B5/087—Arrangements of electrodes, e.g. of charging, shielding, collecting electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets

Definitions

  • the invention relates to a method and a device for the electrostatic coating of an electrically conductive workpiece with coating powder.
  • spray powder is sprayed onto the surface of a workpiece with a spray gun.
  • electric field forces are used to charge the powder particles electrically and to increase the movement of the powder particles towards the workpiece.
  • the corona coating is a special form of electrostatic surface coating.
  • a high DC voltage is applied to an electrode in the spray gun and the workpiece is grounded. This creates an electric field between the electrode tip and the workpiece.
  • a corona discharge or corona for short occurs.
  • the fluid (air molecules, powder particles) surrounding the electrode tip is ionized and thus electrically charged.
  • Corona discharge is a process in which a (permanent) current flow from the electrode through the air and the powder to the workpiece is generated.
  • ions act as charge carriers, which are generated by a plasma around the electrode tip.
  • the electric field that prevails between the electrode tip and the workpiece causes the charged particles to have an electrical force, also referred to as Coulomb's force.
  • This force acting on the charged particles is proportional to the field strength and is stronger the greater the charge.
  • the polarity of the pointed electrode determines the polarity of the corona. If a negative potential is applied to the electrode, electrons are emitted from the electrode which, when they hit air molecules or powder particles, ionize them.
  • Recesses in workpieces form Faraday cages, which cause the electric field lines can not penetrate into them. But this also penetrates little or no powder in the wells in the workpiece.
  • FIG. 1 the field line distribution is shown in a corona coating with the spray gun 10 near the edge of the workpiece.
  • the field lines extend from the electrode tip 2 of the powder spray gun 10 to the earthed workpiece 1. Since it is a three-dimensional workpiece 1, there are three-dimensional equipotential surfaces on each of which the potential is constant. In FIG. 1 For reasons of clarity, however, only equipotential lines, ie those lines on which the electrical potential is constant, are shown. They run perpendicular to the field lines. In the middle region of the workpiece 1, the field lines are perpendicular to the workpiece surface and are evenly distributed over the workpiece surface. At the edge of the workpiece 1, however, the field lines run crowded. In this area more powder is thereby deposited. It comes to edge construction. Part of the field lines also reaches the back of the workpiece 1. Therefore, a part of the powder is deposited there as well.
  • the workpiece Since the workpiece is non-conductive, the required for electrostatic powder coating electric field between spray member and workpiece can not train. In order for Coulomb forces between powder particles and the workpiece surface to arise, the particle charges must be able to generate mirror charges on the workpiece surface. This in turn requires a conductive grounded workpiece surface. However, the non-conductive workpiece surface can not be earthed and the charge can not be derived in a defined manner to the ground potential. Thus no Coulomb forces between the powder particles and workpiece surface can act. This Procedure is therefore specially designed for non-conductive workpieces.
  • An object of the invention is therefore to specify a method and a device for electrostatically coating an electrically conductive workpiece with coating powder, in which a uniform, homogeneous layer thickness is achieved both in the area of the workpiece and in the region of the workpiece edges.
  • the object of the invention is achieved by a process for the electrostatic coating of an electrically conductive workpiece with coating powder having the features according to patent claim 1.
  • the method according to the invention for the electrostatic coating of an electrically conductive workpiece with coating powder comprises the following steps.
  • the workpiece is grounded.
  • an electrode is placed on a negative potential with respect to the workpiece and a counter electrode on a positive potential opposite to the workpiece.
  • the potential in the region of the workpiece in which the workpiece is to be coated is set depending on the desired powder layer thickness in this area and sprayed the workpiece in this area by means of a powder spray gun with coating powder.
  • the object of the invention is also achieved by a device for electrostatic coating of an electric conductive workpiece with coating powder having the features of claim 12.
  • the device according to the invention for the electrostatic coating of an electrically conductive workpiece with coating powder comprises a powder spray gun with an electrode.
  • a counter electrode and a controller for adjusting the potential for the electrode and the potential for the counter electrode are provided.
  • the control unit is designed and operable such that the location of the zero potential can thus be set.
  • the area to be coated may be an edge of the workpiece and in particular an edge of the workpiece or an opening in the workpiece.
  • the potential at the electrode is adjusted accordingly for setting the potential in the region of the workpiece to be coated.
  • the potential at the counterelectrode is set correspondingly for setting the potential in the region of the workpiece to be coated.
  • the potential in the region of the workpiece to be coated is set by the position of the counter electrode is adjusted accordingly.
  • the potential in the area of the workpiece to be coated is advantageously set so that it is approximately zero there.
  • the counterelectrode is moved synchronously with the electrode.
  • the spray current flowing through the electrode is kept at a constant value.
  • the spray current flowing through the counter electrode is set as a function of the height of the spray current flowing through the electrode.
  • the current flowing over the workpiece can be adjusted. This is important for operational safety, among other things.
  • the spray current flowing through the counter electrode or the potential applied to the counter electrode be increased and / or the distance between the counter electrode and the workpiece be reduced if the powder layer thickness on the workpiece is to be reduced.
  • the powder layer thickness on the workpiece is to be increased, it is possible to reduce the spray current flowing through the counter electrode or the potential applied to the counter electrode and / or increase the distance of the counter electrode to the workpiece.
  • a further counterelectrode is placed on a further positive potential with respect to the workpiece. This allows the electric field to be adapted even more to the geometry of the workpiece.
  • control unit may have an operating element in order to be able to specify the desired powder layer thickness. This allows the user to specify how thick individual areas of the workpiece are to be coated with powder.
  • the position of the counter electrode is adjustable. In this way, the electric field can be even more adapted to the geometry of the workpiece.
  • the counter electrode can be arranged on the same side as the powder spray gun.
  • FIG. 2a is a first possible embodiment of the arrangement according to the invention for powder coating in the Top view shown.
  • a flat workpiece 1 with an opening O which can be located anywhere in the workpiece 1, is moved through a powder coating booth 6 for coating in the transport direction T.
  • a powder spray gun 10, which has an electrode 2 projects through a side wall of the cabin 6.
  • the electrode 2 is also referred to as a spray electrode.
  • the side of the workpiece 1 coated with the powder spray gun 10 is referred to as the front side.
  • a counter electrode 3 is arranged on the opposite side wall of the car 6, .
  • the counter electrode 3 may be part of a further powder spray gun, but in FIG. 1 not shown.
  • a high DC voltage U 2 for example -30 kV, is applied to the electrode 2.
  • a high DC voltage U 3 is also applied, which, however, has an opposite polarity to the voltage U 2 .
  • the voltage U 2 may be, for example, +37 kV.
  • the field lines 7 are dotted and the equipotential lines 8 shown in dashed lines.
  • the equipotential line is not curved when the two voltages U 2 and U 3 are set accordingly. Ideally, this applies in all three dimensions, even though only two dimensions are drawn on paper for simplicity.
  • the electrode 2 and the counter electrode 3 generate the same and in their polarity opposite electric fields relative to the reference ground. The middle area is thus on the potential zero. That means there is the same potential there as earth.
  • FIG. 2a shown electric field is not affected by a flat, grounded workpiece 1.
  • the powder cloud 9 generated by the spray gun 10 strikes the workpiece 1 in the region B, which is referred to as the coating zone.
  • the powder particles in the coating zone B move along the field lines and thus strike the zone perpendicular to the zone workpiece surface. As a result, a constant powder layer thickness is achieved on the workpiece.
  • the course of the electric field lines can be changed and thus also the position of the equipotential line on which the potential is zero can be shifted relative to the workpiece 1.
  • the high voltage U 3 is increased at the counterelectrode 3
  • the equipotential line with zero potential moves in the direction of the powder spray gun 10.
  • the field lines of the counterelectrode 3 reach the front side of the workpiece 1. This in turn results in less powder in the region of the edge K attached.
  • the high voltage U 3 which is also referred to as countervoltage, is reduced, field lines of the spray gun 10 reach beyond the edge region on to the rear side of the workpiece 1. This deposits more powder in the region of the edge K.
  • the negative charge carriers or electrons move from the negative spray electrode 2 via the air to the grounded workpiece 1 and from there via the workpiece suspension or workpiece attachment via the earth to the high voltage generator. This completes the circuit.
  • an interruption of this circuit arises at the point of interruption high voltage difference.
  • the workpiece 1 is suspended from an electrical hook which is not conductive or only badly conductive, the workpiece 1 can charge to a voltage of 10 kV and more. The reason for the poor conductivity can be color residues on the hook. The result is a poor coating of the workpiece.
  • the corona current can not flow away to the earth, the workpiece is charged, it can lead to flashovers and it can spark ignitable sparks.
  • two independent oppositely poled circuits act on the same workpiece 1. These circuits are ideally equal in magnitude. For example, when the current I 2 flowing through the electrode 2 of the coating gun 10 to the workpiece 1 is -50 ⁇ A, the current I 3 flowing through the counter electrode 3 to the workpiece 1 is +50 ⁇ A. Due to the first Kirchhoff's law, the sum of the currents I 2 and I 3 in the workpiece 1 is zero.
  • the potentials U 2 and U 3 are adjusted by means of a control unit 4 and regulated if necessary.
  • the control unit 4 is connected via an electrical line 11 to the counter electrode 3 and via an electrical line 12 to the electrode 2.
  • the control unit 4 a control element 5.
  • the control element 5 may be, for example, a knob, a button or a keyboard.
  • the control unit 4 can also monitor and regulate the currents I 2 and I 3 .
  • the spray gun 10 is connected via a powder hose 14 with a powder reservoir 13.
  • FIG. 3 shows the first embodiment of the arrangement according to the invention for powder coating during the coating of the frame-shaped workpiece 1. Since the electric field is not significantly affected by the frame-shaped workpiece 1, follow the powder sprayed from the powder spray gun 10 powder particles still in the coating zone B the course of Field lines and meet there perpendicular to the frame, so that the powder order there neither to or decreases. Thus, even with a frame-shaped workpiece, a constant powder layer thickness is ensured and the edge structure is avoided.
  • FIG. 4 shows a second possible embodiment of the inventive arrangement for powder coating during the coating of the workpiece edge K.
  • the workpiece is no longer a thin part, but has, as in FIG. 4 shown a considerable depth.
  • the powder spray gun 10 with the spray electrode 2.
  • the counter electrode 15 is no longer under tension. It forms the in FIG. 4 shown electric field between the electrode 2 and the counter electrode 3 from.
  • the Aquipotenzialline with the potential zero passes through the edge to be coated K.
  • the potential U 3 is selected to be higher on the counter electrode 3 than the potential U 2 at the electrode 2 of the coating gun 10th
  • the workpiece 1 is moved out in the direction T from the coating area. Thus, the rear surface of the workpiece is coated. So that the rear edge K is not coated too much, the left counter electrode 3 is active. If, instead, the workpiece 1 were transported into the coating area, the right-hand counter-electrode 15 would be active.
  • FIG. 5 shows a third possible embodiment of the powder coating arrangement according to the invention during the coating of the workpiece edge.
  • both the spray gun 10 and the two counter-electrodes 3 and 15 are located on one side of the booth 6.
  • the counter-electrodes 3 and 15 can each be part of a further spray gun.
  • the counter electrode 15 is no longer under tension. It forms the in FIG. 5 shown electric field between the electrode 2 and the counter electrode 3 from.
  • the equipotential line with zero potential passes through the edge K to be coated.
  • the workpiece 1 is moved out of the coating area in the direction T and the rear surface of the workpiece 1 is coated. Would instead the workpiece 1 transported into the coating area, the counter electrode 15 would be active.
  • only one counter-electrode 3 can be provided, which is arranged to be movable.
  • the counter electrode 3 can be pivoted from the position to the left of the spray gun 10 to the position to the right of the spray gun 10.
  • the workpiece including its edges can be coated with a uniformly thick powder layer. If desired, however, more or less powder can be applied to the edges. So it is also possible to completely avoid powder application at the edges.
  • the inventive method also achieves a more homogeneous distribution of the powder application on the flat areas of the workpiece.
  • Another effect of this method is that the leakage current I in the workpiece is greatly reduced or zero.
  • This leakage current I can be kept at zero by an automatic or manual control.
  • workpieces with poor or low conductivity can be coated. This can be an advantage when coating MDF boards.
  • counter electrode is intended to express that the potential at this counter electrode opposite to the electrode is opposite.
  • FIGS. 6a to 6f shows various edges K, edges R and openings O in the workpiece 1 in plan view.
  • edge R is understood to mean a boundary of the workpiece 1, which can be of any desired shape.
  • Fig. 6a, 6b and 6c shown workpiece edges K under the generic term workpiece edge.
  • Fig. 6e and 6f shown openings O in the workpiece are workpiece edges.
  • the right edge of the opening O is less curved than the right edge of the opening O in FIG. 6e ,

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  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP07405310A 2007-10-17 2007-10-17 Procédé et dispositif destinés au revêtement électrostatique d'une pièce à usiner conductrice de courant électrique à l'aide d'une poudre de revêtement Withdrawn EP2050507A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07405310A EP2050507A1 (fr) 2007-10-17 2007-10-17 Procédé et dispositif destinés au revêtement électrostatique d'une pièce à usiner conductrice de courant électrique à l'aide d'une poudre de revêtement
US12/250,659 US8329258B2 (en) 2007-10-17 2008-10-14 Method and device for electrostatic coating of an electrically conducting workpiece with coating powder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07405310A EP2050507A1 (fr) 2007-10-17 2007-10-17 Procédé et dispositif destinés au revêtement électrostatique d'une pièce à usiner conductrice de courant électrique à l'aide d'une poudre de revêtement

Publications (1)

Publication Number Publication Date
EP2050507A1 true EP2050507A1 (fr) 2009-04-22

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EP07405310A Withdrawn EP2050507A1 (fr) 2007-10-17 2007-10-17 Procédé et dispositif destinés au revêtement électrostatique d'une pièce à usiner conductrice de courant électrique à l'aide d'une poudre de revêtement

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US (1) US8329258B2 (fr)
EP (1) EP2050507A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107020211A (zh) * 2017-04-19 2017-08-08 天长市金陵电子有限责任公司 一种智能修复粉末喷涂设备
JP2017177096A (ja) * 2016-03-25 2017-10-05 アネスト岩田株式会社 静電噴霧装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009060692B4 (de) * 2009-12-29 2014-07-31 Airbus Operations Gmbh Verfahren zur Kantenversiegelung eines Bauteils und kantenversiegeltes Bauteil
US9358580B1 (en) 2013-03-12 2016-06-07 BTD Wood Powder Coating, Inc. Method for preparing and top coating a powder coated wood substrate
US8721396B1 (en) 2013-03-12 2014-05-13 BTD Wood Powder Coating, Inc. Method for preparing and buffing a powder coated wood substrate
US10226786B2 (en) 2013-08-15 2019-03-12 Gema Switzerland Gmbh Powder pipe coating booth
CN114985133A (zh) * 2022-05-23 2022-09-02 佛山市德珼尔科技有限公司 一种用于mdf中纤板粉末喷涂的反向电极

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0260853A2 (fr) * 1986-09-15 1988-03-23 Imperial Chemical Industries Plc Procédé de pulvérisation
DE4219621A1 (de) * 1992-06-16 1993-12-23 Licentia Gmbh Elektrostatische Pulverbeschichtungskabine
US20030185964A1 (en) * 2002-03-28 2003-10-02 Jan Weber Method for spray-coating a medical device having a tubular wall such as a stent

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
DE2022088C3 (de) * 1970-05-06 1981-04-23 Graco Inc., Minneapolis, Minn. Spritzpistole zum Aufbringen von Schutzschichten aus Kunststoffpulver
FR2243740B1 (fr) * 1973-09-14 1978-10-27 Voith Gmbh
FI121123B (fi) * 2002-03-14 2010-07-15 Metso Paper Inc Menetelmä jatkuvan rainan pinnan päällystämiseksi kuivapäällystysjauheella

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0260853A2 (fr) * 1986-09-15 1988-03-23 Imperial Chemical Industries Plc Procédé de pulvérisation
DE4219621A1 (de) * 1992-06-16 1993-12-23 Licentia Gmbh Elektrostatische Pulverbeschichtungskabine
US20030185964A1 (en) * 2002-03-28 2003-10-02 Jan Weber Method for spray-coating a medical device having a tubular wall such as a stent

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017177096A (ja) * 2016-03-25 2017-10-05 アネスト岩田株式会社 静電噴霧装置
EP3434376A4 (fr) * 2016-03-25 2019-11-27 Anest Iwata Corporation Dispositif de pulvérisation électrostatique
CN107020211A (zh) * 2017-04-19 2017-08-08 天长市金陵电子有限责任公司 一种智能修复粉末喷涂设备

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US20090104368A1 (en) 2009-04-23
US8329258B2 (en) 2012-12-11

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