EP0268211B1 - Procédé d'application d'une poudre d'émail par projection électrostatique sur des pièces avec addition d'un gaz de protection - Google Patents

Procédé d'application d'une poudre d'émail par projection électrostatique sur des pièces avec addition d'un gaz de protection Download PDF

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Publication number
EP0268211B1
EP0268211B1 EP19870116719 EP87116719A EP0268211B1 EP 0268211 B1 EP0268211 B1 EP 0268211B1 EP 19870116719 EP19870116719 EP 19870116719 EP 87116719 A EP87116719 A EP 87116719A EP 0268211 B1 EP0268211 B1 EP 0268211B1
Authority
EP
European Patent Office
Prior art keywords
powder
addition
fact
enamel powder
process according
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.)
Expired - Lifetime
Application number
EP19870116719
Other languages
German (de)
English (en)
Other versions
EP0268211A3 (en
EP0268211A2 (fr
Inventor
Berndpeter Dr.-Ing. Schumacher
Wilfried Dipl.-Phys. Galle
Christel Dipl.-Ing. Sickert
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.)
Bayer AG
Original Assignee
Bayer 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 Bayer AG filed Critical Bayer AG
Publication of EP0268211A2 publication Critical patent/EP0268211A2/fr
Publication of EP0268211A3 publication Critical patent/EP0268211A3/de
Application granted granted Critical
Publication of EP0268211B1 publication Critical patent/EP0268211B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C23D5/04—Coating with enamels or vitreous layers by dry methods

Definitions

  • the invention relates to a method for applying electrostatically sprayable enamel powder to workpieces with the addition of protective gas.
  • enamel powder i.e. powdered, hydrophobized enamel frits u. Suspend the like in air, in this form to a sprayer and spray there under the influence of an electric field, the electric field being generated by a high voltage.
  • DE-OS 27 15 128 describes a method for applying a glazed enamel to metallic workpieces by generating a strong, directed electrostatic field which directs the charged powder onto the workpiece.
  • the particles of enamel powder cannot initially be sprayed electrostatically without additional technological means, such as coating with silicone compounds, since they have an organic composition and the required high electrical surface resistances are not present.
  • enamel powder air mixtures are not explosive.
  • the enamel powders produced with the known preparation processes are subject to a high degree of negative influence by air humidity and temperature during the application process.
  • DE-AS 24 51 672 describes a process for the electrostatic spraying of powdery substances onto preheated metal pipes, in which, in addition to other technological features, the powdery substances are sprayed with intergas.
  • intergas is necessary for the purpose of preventing the oxidation of the workpiece and to reduce the risk of explosion of the plastic powder-air mixture.
  • the use of this solution for coating with enamel powder is not possible due to the design of the device used and the technological process sequence, since electrostatically sprayable enamel powders do not adhere to heated materials in accordance with quality.
  • the invention seeks to remedy this.
  • the invention as characterized in the claims, solves the problem of creating a method for applying electrostatically sprayable enamel powder to workpieces with the addition of gas, by means of which the differences in layer thickness are reduced to a minimum by means of increased spraying and deposition rates and the dependence on Fluctuations in temperature and humidity are reduced.
  • electrostatic powder application is understood to mean the process of charging the enamel particles, their migration to the workpiece and the subsequent deposition of the particles on the workpiece.
  • the advantages achieved by the invention are essentially to be seen in the fact that the charging behavior of the enamel powder is improved by the addition of CO2, at the same time preventing the possibility of discharge, so that the spray yield is increased and the powder adhesion on the workpiece is increased. Furthermore, the dependency of the coating process on the temperature and humidity of the surrounding working atmosphere is reduced, the effectiveness of the electrostatic enamel powder coating significantly improved, while at the same time the investment costs by reducing the necessary facilities, such as air conditioning for the spray room, the number of sprayers required, and reducing the differences in layer thickness by generating a uniform layer thickness to a minimum.
  • a workpiece for example a baking chamber of an electric cooker with electrostatic enamel powder
  • a known device such as an application booth with several spray guns, to which the processed enamel powder is fed, high-voltage generator, conveyor chain for workpiece conveyance and the like.
  • the powder application carried out.
  • the uncharged enamel powder intended for spraying is conveyed from the powder storage container by means of CO2-containing gas and fed to the spray guns, the electrostatic charging of the enamel powder taking place directly in the spray guns via electrodes.
  • the application booth can advantageously also be supplied through existing openings to improve the powder adhesion to the workpiece CO2.
  • the powder particles are applied to the workpiece being passed.
  • no air conditioning measures are generally carried out when individual coatings are necessary.
  • the layer thicknesses which occur during the application of enamel powder fluctuate very strongly as a function of room temperature and room air humidity.
  • the spraying and separation rate is increased by approx. 20%.
  • the amount of powder adhering to the workpiece increases by approx. 10%.
  • the coating result is constant under various external climatic conditions, which is not possible under the naturally changing conditions (temperature, air humidity) when using known methods.
  • a CO2-air mixture (1: 3) is used in a system in which the outer parts of the hearth are coated on a running conveyor chain by means of powder enamelling.
  • the spray yield increases by approx. 15%.
  • the spray booth is supplied with ambient air and CO2-containing, dewatered exhaust gas from an enamelling furnace.
  • the powder adhesion improves by approx. 15%.
  • the number of spray guns required can be reduced from 12 to 10 previously.
  • the more uniform layer thickness distribution achieved results in a 20% lower enamel powder consumption.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Paints Or Removers (AREA)
  • Prostheses (AREA)
  • Materials For Medical Uses (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Claims (7)

  1. Procédé d'application sur des pièces d'une poudre d'émail pulvérisable par voie électrostatique avec addition de gaz protecteur, caractérisé en ce que l'application de la poudre est effectuée avec addition de gaz contenant du CO₂.
  2. Procédé selon la revendication 1, caractérisé en ce que le gaz protecteur utilisé est de l'air comprimé enrichi en CO₂ également utilisé comme fluide de transport de la poudre d'émail du réservoir au dispositif de pulvérisation.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la proportion de CO₂ est de 10% à 100%.
  4. Procédé selon les revendications 1 à 3, caractérisé en ce que le gaz contenant du CO₂ est du gaz résiduaire de processus technologiques.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que le gaz contenant du CO₂ est distribué par des appareils pulvérisateurs.
  6. Procédé selon les revendications 1 à 4, caractérisé en ce que le gaz contenant du CO₂ est distribué par des trous d'une chambre de pulvérisation.
  7. Procédé selon les revendications 1 à 4, caractérisé en ce que le gaz contenant du CO₂ est distribué par des appareils pulvérisateurs et des trous d'une chambre de pulvérisation.
EP19870116719 1986-11-18 1987-11-12 Procédé d'application d'une poudre d'émail par projection électrostatique sur des pièces avec addition d'un gaz de protection Expired - Lifetime EP0268211B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD296368 1986-11-18
DD29636886A DD253647B1 (de) 1986-11-18 1986-11-18 Verfahren zur pulver-emaillierung

Publications (3)

Publication Number Publication Date
EP0268211A2 EP0268211A2 (fr) 1988-05-25
EP0268211A3 EP0268211A3 (en) 1990-01-31
EP0268211B1 true EP0268211B1 (fr) 1992-05-13

Family

ID=5583947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870116719 Expired - Lifetime EP0268211B1 (fr) 1986-11-18 1987-11-12 Procédé d'application d'une poudre d'émail par projection électrostatique sur des pièces avec addition d'un gaz de protection

Country Status (6)

Country Link
EP (1) EP0268211B1 (fr)
CS (1) CS785487A1 (fr)
DD (1) DD253647B1 (fr)
DE (1) DE3779054D1 (fr)
ES (1) ES2031109T3 (fr)
SU (1) SU1581777A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5397605A (en) * 1992-05-29 1995-03-14 Barbieri; Girolamo Method and apparatus for electrostatically coating a workpiece with paint
US8715787B2 (en) * 2011-05-24 2014-05-06 Alfonz Morav{hacek over (c)}ík Method of making a compact layer of enamel coatings on moulded products
CN110625535A (zh) * 2019-10-25 2019-12-31 立丰家庭用品（南京）有限公司 珐琅容器制作工艺及珐琅容器

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1108722A (en) * 1966-10-26 1968-04-03 Shell Int Research A process for coating articles
GB1273159A (en) * 1968-09-19 1972-05-03 Head Wrightson & Co Ltd Method and apparatus for coating continuously moving surfaces

Also Published As

Publication number Publication date
DD253647A1 (de) 1988-01-27
EP0268211A3 (en) 1990-01-31
ES2031109T3 (es) 1992-12-01
DD253647B1 (de) 1988-12-14
SU1581777A1 (ru) 1990-07-30
DE3779054D1 (de) 1992-06-17
EP0268211A2 (fr) 1988-05-25
CS785487A1 (en) 1989-08-14

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