EP1658904A1 - Procédé et dispositif pour vernir des pièces - Google Patents

Procédé et dispositif pour vernir des pièces Download PDF

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Publication number
EP1658904A1
EP1658904A1 EP05025072A EP05025072A EP1658904A1 EP 1658904 A1 EP1658904 A1 EP 1658904A1 EP 05025072 A EP05025072 A EP 05025072A EP 05025072 A EP05025072 A EP 05025072A EP 1658904 A1 EP1658904 A1 EP 1658904A1
Authority
EP
European Patent Office
Prior art keywords
workpiece
workpieces
paint
electrocoating
rinsing
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Withdrawn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
EP05025072A
Other languages
German (de)
English (en)
Inventor
Erich Springer
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1658904A1 publication Critical patent/EP1658904A1/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Withdrawn legal-status Critical Current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
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/542—No clear coat specified the two layers being cured or baked together
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • 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
    • B05D1/007—Processes for applying liquids or other fluent materials using an electrostatic field
    • 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
    • B05D2202/00—Metallic substrate

Definitions

  • the invention relates to a method for painting workpieces and to an apparatus for carrying out such a method.
  • Electrocoating is a coating process that uses electrochemical processes. The process was based on the principle of "mutual attraction, that is, on the principle that mutual electric charges attract and repel equilateral charges.” The basic of electrocoating is that materials with different electrical charges attract each other The paint particles are attracted to the workpiece and applied to it, where they form a uniform film over the entire surface of the workpiece.
  • the workpiece including all gaps and corners can be coated until the coating has reached a layer thickness of 25 microns ⁇ 5 microns.
  • this paint thickness of the resulting film then acts insulating on the workpiece. The electrical attraction is interrupted and the coating is completed.
  • the workpieces are first cleaned in the pretreatment and pretreated by means of phosphating or chromating. Then they are immersed in the electrodeposition bath in the paint bath, where a voltage between the workpieces and the counter electrode is applied. The color particles are attracted to the workpiece by electric field lines which form and are deposited there.
  • One way to achieve greater layer thicknesses is to first apply a conductive primer on the workpiece and then perform a further electrocoating.
  • a two-layer electrocoating system is used.
  • the applied as electrocoating conductive primer must first be completely baked in the baking oven. Only then can the second electrodeposition coating be applied in a second pass. Subsequently, a second baking of this second coating is required.
  • the layer thickness can be increased by 15 to 20 microns. The process is very expensive.
  • Another disadvantage is that you need per color tone an electro-immersion bath with accompanying equipment.
  • the object of the invention is to propose an improved method of the type described above and an improved apparatus for carrying out such a method.
  • This object is achieved in a method for painting workpieces by the features of claim 1.
  • the workpiece is electrocoated. Thereafter, the workpiece is painted. This painting is done without the previously prepared by electrocoating coating is baked. The electrodeposition paint is therefore not baked; rather, a second layer of paint is applied to the electrodeposition paint without prior baking.
  • the workpiece is rinsed after electrocoating.
  • the second lacquer layer is applied.
  • the workpiece is blown off after rinsing. Thereafter, the second lacquer layer is applied.
  • the workpiece is fired after painting. Due to the two layers applied one behind the other, a layer is created after the baking process, which is inseparably connected.
  • the device according to the invention for painting workpieces in particular for carrying out the method according to the invention, comprises an electrodeposition bath and a coating booth.
  • a purging device is also provided.
  • a further advantageous embodiment is characterized by a blow-off device.
  • a baking oven is also present.
  • the device comprises an electrocoating tank (ETL tank) 1, to which a first rinsing device 2 and a second rinsing device 3 connect.
  • the apparatus further comprises a coating booth 4 and a baking oven 5.
  • the workpieces 6 to be painted pass through these areas in the stated order.
  • the varnish is supplied to the electrocoating tank 1 through a supply line 7 in its bottom area. This is done by a paint pump 8, which sucks the paint from a channel 9, which is located in the edge region of the ETL tank 1.
  • the paint pump 8 pumps the paint to a filter 10 and subsequently to an ultrafiltration 11.
  • the filtrate of the ultrafiltration 11 is fed via a line 12 to the second flushing device 2.
  • the paint is fed from the ultrafiltration 11 a heat exchanger 13 and from there via the supply line 7 to the ETL tank. 1
  • the electrode 14 of the ETL tank 1 is connected to a rectifier 15, which is further connected to the conveyor 16 of the workpieces 6.
  • the workpieces 6 are immersed in the electrodeposition bath of the electrocoating tank 1 and electrocoated there. Thereafter, the workpieces 6 are rinsed in the first rinsing device 2 and then rinsed once more in the second rinsing device 3.
  • the workpieces 6 then pass into a blower zone with a blow-off device (not shown in the drawing), in which adhering rinse water is blown off the workpieces. They are then fed to the coating booth 4.
  • a blow-off device not shown in the drawing
  • the workpieces 6 are painted. This is done by hand or automatically or by robot.
  • the application of this second coat of paint takes place after the last rinse in the second rinsing device 3 and after the blow-off, without the paint applied in the ETL tank 1 by electrocoating paint is previously baked.
  • the same or other electrodeposition paints can be applied.
  • water-based or solvent-based paints can be applied. It is possible to apply lacquers with the same or a different shade or degree of gloss. It is possible to apply powder coatings with suitable hardener systems in any layer thickness.
  • the workpieces 6 are fed to the baking oven 5. Due to the two layers applied directly one behind the other, after the baking process in the baking oven 5, a layer is formed which is inseparably joined. This makes it possible to achieve much higher layer thicknesses in a single operation. Color, gloss and layer thickness changes are possible without additional electrodeposition baths.
  • the new method makes it possible, without additional two-layer coatings in additional electrocoating baths with subsequent baking and without powder coatings with repeated baking and without any intermediate adhesion problems paint coatings in the desired thickness and in the desired color without great mechanical effort cost-effectively.
  • the inventive method can be integrated into the process flow of an existing electrocoating plant. However, it can also be used outside of an automated system.
  • logos, emblems, etc. can be applied to workpieces and then coated with colorless or translucent paint and then baked, wherein a single layer is formed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP05025072A 2004-11-17 2005-11-16 Procédé et dispositif pour vernir des pièces Withdrawn EP1658904A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200410055458 DE102004055458A1 (de) 2004-11-17 2004-11-17 Verfahren und Vorrichtung zum Lackieren von Werkstücken

Publications (1)

Publication Number Publication Date
EP1658904A1 true EP1658904A1 (fr) 2006-05-24

Family

ID=35809544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05025072A Withdrawn EP1658904A1 (fr) 2004-11-17 2005-11-16 Procédé et dispositif pour vernir des pièces

Country Status (2)

Country Link
EP (1) EP1658904A1 (fr)
DE (1) DE102004055458A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20100018A1 (it) * 2010-01-28 2011-07-29 Matteo Pisano Impianto per il trattamento superficiale del metallo e leghe in due fasi, mediante un processo chimico-fisico-elettrolitico, con ciclo di lavoro combinato a piu' sezioni di cataforesi e verniciatura a polveri.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2726984A1 (de) * 1977-06-15 1979-01-18 Suedrad Gmbh Verfahren zum aufbringen von ueberzugsmaterial auf die oberflaeche von gegenstaenden, insbesondere von raedern fuer kraftfahrzeuge
EP0402181A1 (fr) * 1989-06-12 1990-12-12 Nissan Motor Co., Ltd. Méthode pour former un film de vernis du type "Japon"
US6231932B1 (en) * 1999-05-26 2001-05-15 Ppg Industries Ohio, Inc. Processes for drying topcoats and multicomponent composite coatings on metal and polymeric substrates
US6342144B1 (en) * 1999-12-15 2002-01-29 Basf Aktiengesellschaft Cured multilayer coating and processing for its production

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2726984A1 (de) * 1977-06-15 1979-01-18 Suedrad Gmbh Verfahren zum aufbringen von ueberzugsmaterial auf die oberflaeche von gegenstaenden, insbesondere von raedern fuer kraftfahrzeuge
EP0402181A1 (fr) * 1989-06-12 1990-12-12 Nissan Motor Co., Ltd. Méthode pour former un film de vernis du type "Japon"
US6231932B1 (en) * 1999-05-26 2001-05-15 Ppg Industries Ohio, Inc. Processes for drying topcoats and multicomponent composite coatings on metal and polymeric substrates
US6342144B1 (en) * 1999-12-15 2002-01-29 Basf Aktiengesellschaft Cured multilayer coating and processing for its production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20100018A1 (it) * 2010-01-28 2011-07-29 Matteo Pisano Impianto per il trattamento superficiale del metallo e leghe in due fasi, mediante un processo chimico-fisico-elettrolitico, con ciclo di lavoro combinato a piu' sezioni di cataforesi e verniciatura a polveri.

Also Published As

Publication number Publication date
DE102004055458A1 (de) 2006-05-24

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