EP0880001B1 - Process for drying paints on metallic or non-metallic components or assemblies of any structure - Google Patents

Process for drying paints on metallic or non-metallic components or assemblies of any structure Download PDF

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Publication number
EP0880001B1
EP0880001B1 EP98107504A EP98107504A EP0880001B1 EP 0880001 B1 EP0880001 B1 EP 0880001B1 EP 98107504 A EP98107504 A EP 98107504A EP 98107504 A EP98107504 A EP 98107504A EP 0880001 B1 EP0880001 B1 EP 0880001B1
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EP
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Prior art keywords
additive
drying chamber
coatings
process according
assemblies
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EP98107504A
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German (de)
French (fr)
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EP0880001A1 (en
Inventor
Thomas Dipl.-Ing. Gante
Dieter Bütergerds
Armin Dr. Dipl.-Chem. Fangmeier
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Airbus Operations GmbH
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Airbus Operations GmbH
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/347—Electromagnetic heating, e.g. induction heating or heating using microwave energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection

Definitions

  • the invention relates to a method for energy saving Drying of paints on metallic or non-metallic Individual parts or assembled assemblies of any structure and with complicated geometry in a continuous process or in stationary operation in a heated drying room, especially of paints on aluminum components or on components made of fiber composite materials for aircraft, wherein preferably water-dilutable as well as solvent-based varnishes
  • One or two component paints on epoxy or Polyurethane base are used, being the heat source in the Drying room at least one microwave module for generation of by means of waveguides with defined outlet openings used microwaves introduced into the drying room and where air to flow around the individual parts or Assemblies are introduced into the drying room.
  • Drying on metallic components or components lacquers applied from fiber composite materials, in particular of two-component paints, in convection ovens by means of warm air within a temperature range of e.g. B. 40 to 90 ° C is generally known.
  • The is also known Drying of such varnishes with the help of infrared radiation. Disadvantages of these drying processes are proportionate high energy consumption and in long drying times to see. Can also disadvantageously by means of infrared radiation due to the formation of shadows Components of simple geometric shape are dried.
  • FR 24 58 323 describes a method for coating a Described substrate with which a thin on the substrate Layer of a coating is applied.
  • the substrate can consist in particular of glass or an analog material.
  • the coating is made by applying microwave energy treated warm, the special feature of which is that this energy in a selected frequency range lies, which is suitable for certain components of the Selectively stimulate coating.
  • the regulation of the microwave is designed in such a way that the microwave radiation fed into the drying room so far changed in frequency is that the temperature of the coating is constant Maintains nominal value. This is done with a commercially available Pyrometer.
  • the microwave directly affects the coating here.
  • Some of the varnishes are specially made for microwave drying modified, e.g. through coal dust. It will uses only non-conductive substrate materials, frequencies higher than 2.45 Ghz are also used.
  • DE 41 21 is the closest prior art 203 A1 a method and an apparatus for drying water-soluble dispersion varnish on paper or cardboard webs known or arcs using microwaves. It will preferably commercially available and approved oscillators used the microwave energy in multiple arrangement couple into waveguide. The webs or arches are dried in a pass, and remains after drying a negligible residual moisture with the most economical Energy.
  • the invention is therefore based on the object of an energy-saving To create drying process with which also a fast drying of components with complicated geometry is ensured.
  • the object is achieved in that the air introduced with an additive with a dipole character is enriched so that the air mixture has a relative Share of additive within a given controllable range from 20% to 90%, and that the proportion of additive in the drying room complied with becomes.
  • the method according to the invention is advantageous fast drying of components of any geometry at relatively low temperatures and at a uniform heating of the paint surfaces achieved what is special for aluminum components used in aircraft construction or components made of fiber composite materials are an advantage is.
  • the method according to the invention advantageously makes itself take advantage of the fact that to run a more effective chemical crosslinking is part of the additive for those surrounding the individual parts or assembled assemblies Air serves as a reaction partner. That from air and one admixed additive produced air mixture flows around the components or assemblies in the drying room, the molecules of the air mixture from the microwaves in Vibrations are set. That way in the air mixture resulting heat energy is on the to be dried Paint surface transfer and favors chemical cross-linking.
  • nine microwave modules with four magnetrons each with a high-frequency power from Z. B. 1.2 KW each can be used. From this results the total output of 43.2 KW, of which about 36 KW can be used.
  • the additive preferably water vapor
  • the object is also achieved in that the coatings with a polarizable dielectric as an additive be enriched and that the additive during the microwave radiation directly to increase the temperature of the Lacquer layer and / or by exiting the lacquer layer in the air surrounding the individual parts or assemblies and thus to increase the temperature of the mixture of air and additive is used.

Abstract

A process (A) for drying paint on metallic or non-metallic parts or mounted assemblies of any structure, involves using a continuous or static system in a heated drying space, especially water- dilutable or solvent-containing 1- or 2-component epoxy- or polyurethane-based paint on aluminium components or on fibre composite components for aircraft. The drying space is heated by means of microwaves generated in a microwave module and conducted via waveguides with a defined outlet, and air is made to flow round the substrates in the room. Drying air contains a dipolar additive (I) in a predetermined controllable amount within the range of 20-90%, which is kept constant during the process. Also claimed is a process (B) in which the paint is treated with a polarisable dielectric as additive (II), this additive being used directly to increase the temperature of the paint film during microwave irradiation and/or to increase the temperature of the air/additive mixture by extraction from the paint into the surrounding air.

Description

Die Erfindung betrifft ein Verfahren zur energiesparenden Trocknung von Lacken auf metallischen bzw. nichtmetallischen Einzelteilen oder montierten Baugruppen beliebiger Struktur und mit komplizierter Geometrie im Durchlaufverfahren bzw. im stationären Betrieb in einem erwärmten Trocknungsraum, insbesondere von Lacken auf Aluminiumbauteilen oder auf Bauteilen aus Faserverbundwerkstoffen für Luftfahrzeuge, wobei als Lacke vorzugsweise wasserverdünnbare wie auch lösemittelhaltige Ein- oder Zweikomponentenlacke auf Epoxyd- oder Polyurethanbasis verwendet werden, wobei als Wärmequelle im Trocknungsraum mindestens ein Mikrowellenmodul zur Erzeugung von mittels Hohlleitern mit definierten Austrittsöffnungen in den Trocknungsraum eingeleiteten Mikrowellen verwendet wird und wobei Luft zur Umströmung der Einzelteile bzw. Baugruppen in den Trocknungsraum eingeleitet wird.The invention relates to a method for energy saving Drying of paints on metallic or non-metallic Individual parts or assembled assemblies of any structure and with complicated geometry in a continuous process or in stationary operation in a heated drying room, especially of paints on aluminum components or on components made of fiber composite materials for aircraft, wherein preferably water-dilutable as well as solvent-based varnishes One or two component paints on epoxy or Polyurethane base are used, being the heat source in the Drying room at least one microwave module for generation of by means of waveguides with defined outlet openings used microwaves introduced into the drying room and where air to flow around the individual parts or Assemblies are introduced into the drying room.

Eine Trocknung von auf metallischen Bauteilen oder Bauteilen aus Faserverbundwerkstoffen aufgebrachten Lacken, insbesondere von Zweikomponentenlacken, in Konvektionsöfen mittels warmer Luft innerhalb eines Temperaturbereiches von z. B. 40 bis 90 °C ist allgemein bekannt. Ebenso bekannt ist die Trocknung derartiger Lacke mit Hilfe von Infrarotstrahlung. Nachteile dieser Trocknungsverfahren sind in einem verhältnismäßig hohen Energieaufwand sowie in langen Trocknungszeiten zu sehen. Auch können nachteiligerweise mittels der Infrarotstrahlung wegen entstehender Schattenbildung lediglich Bauteile von einfacher geometrischer Gestalt getrocknet werden.Drying on metallic components or components lacquers applied from fiber composite materials, in particular of two-component paints, in convection ovens by means of warm air within a temperature range of e.g. B. 40 to 90 ° C is generally known. The is also known Drying of such varnishes with the help of infrared radiation. Disadvantages of these drying processes are proportionate high energy consumption and in long drying times to see. Can also disadvantageously by means of infrared radiation due to the formation of shadows Components of simple geometric shape are dried.

In der "Deutsche Farben-Zeitschrift, 23. Jahrgang, Nr. 12, 1969" ist auf Seite 585 auf die Möglichkeit der Trocknung von Lacken mittels Mikrowellenstrahlen hingewiesen. Hierbei führt die Einwirkung von in kommerziell verfügbaren Anlagen erzeugten Mikrowellen in einem Bereich von 108 bis 1010 Hz zu einer Erwärmung von Filmmaterial, die im wesentlichen die Überführung in den festen Zustand bewirkt. Die Erwärmung erfolgt durch die auftretenden dielektrischen Verluste; sie ist hochwirksam und sofort einsetzend. Besonders geeignet sind Lacke, die Wasser als Lösungsmittel enthalten. Auch für Druckfarben ist die Mikrowellentrocknung im Prinzip anwendbar. Es ist zweifelhaft, ob Standard-Lacksysteme ohne besondere dielektrische Eigenschaften auf dem obigen Wege zu trocknen sind.The "Deutsche Farben-Zeitschrift, 23rd year, No. 12, 1969" on page 585 refers to the possibility of drying paints by means of microwave radiation. The action of microwaves produced in commercially available systems in a range from 10 8 to 10 10 Hz leads to heating of the film material, which essentially brings about the conversion into the solid state. The heating occurs due to the occurring dielectric losses; it is highly effective and starts immediately. Varnishes containing water as a solvent are particularly suitable. In principle, microwave drying can also be used for printing inks. It is doubtful whether standard coating systems without special dielectric properties can be dried in the above way.

Weiterhin ist es aus den "Patent Abstracts of Japan, C-1021, 1993, Vol. 17, No 46 JP 4-260472 A" bekannt, einen speziellen Lack zu verwenden, der ein durch Mikrowellen erwärmbares Pulver enthält. Die Erwärmung des Pulvers führt dann zur Trocknung des Lackfilmes, wobei die Harze des Lackes und die Substratwerkstoffe wärmebeständig sein müssen. Besondere Eigenschaften, die der Lack anscheinend besitzt, sind aber der Druckschrift nicht zu entnehmen.Furthermore, it is from the "Patent Abstracts of Japan, C-1021, 1993, Vol. 17, No 46 JP 4-260472 A ", a special To use varnish, which can be heated by microwaves Contains powder. The heating of the powder then leads to Drying the paint film, the resins of the paint and the Substrate materials must be heat-resistant. Special properties, that the paint apparently has, but they are Document cannot be removed.

In der FR 24 58 323 ist ein Verfahren zur Beschichtung eines Substrates beschrieben, mit dem auf das Substrat eine dünne Schicht eines Überzugs aufgetragen wird. Das Substrat kann insbesondere aus Glas oder einem analogen Werkstoff bestehen. Der Überzug wird durch Aufbringung von Mikrowellenenergie warm behandelt, wobei die besondere Eigenschaft darin liegt, daß diese Energie in einem ausgewählten Frequenzbereich liegt, der dazu geeignet ist, bestimmte Bestandteile des Überzugs selektiv anzuregen. Die Regelung der Mikrowelle ist derart gestaltet, daß die in den Trockenraum zugeführte Mikrowellenstrahlung in ihrer Frequenz insoweit verändert wird, daß die Temperatur der Beschichtung einen konstanten Nennwert beibehält. Dies geschieht mit einem handelsüblichen Pyrometer. Die Mikrowelle wirkt hier direkt auf die Beschichtung. Die Lacke werden teilweise speziell für die Mikrowellentrocknung modifiziert, z.B. durch Kohlestaub. Es werden ausschließlich nicht-leitende Substratwerkstoffe verwendet, wobei auch höhere Frequenzen als 2,45 Ghz Anwendung finden.FR 24 58 323 describes a method for coating a Described substrate with which a thin on the substrate Layer of a coating is applied. The substrate can consist in particular of glass or an analog material. The coating is made by applying microwave energy treated warm, the special feature of which is that this energy in a selected frequency range lies, which is suitable for certain components of the Selectively stimulate coating. The regulation of the microwave is designed in such a way that the microwave radiation fed into the drying room so far changed in frequency is that the temperature of the coating is constant Maintains nominal value. This is done with a commercially available Pyrometer. The microwave directly affects the coating here. Some of the varnishes are specially made for microwave drying modified, e.g. through coal dust. It will uses only non-conductive substrate materials, frequencies higher than 2.45 Ghz are also used.

Als nächstkommenden Stand der Technik sind aus der DE 41 21 203 A1 ein Verfahren und eine Vorrichtung zum Trocknen von wasserlöslichem Dispersionslack auf Papier- oder Kartonbahnen oder -bögen mit Hilfe von Mikrowellen bekannt. Es werden vorzugsweise im Handel erhältliche und zugelassene Oszillatoren eingesetzt, die in mehrfacher Anordnung die Mikrowellenenergie in Hohlleiter einkoppeln. Die Bahnen oder Bögen werden im Durchlauf getrocknet, und nach dem Trocknen verbleibt eine zu vernachlässigende Restfeuchte bei sparsamstem Energieeinsatz.DE 41 21 is the closest prior art 203 A1 a method and an apparatus for drying water-soluble dispersion varnish on paper or cardboard webs known or arcs using microwaves. It will preferably commercially available and approved oscillators used the microwave energy in multiple arrangement couple into waveguide. The webs or arches are dried in a pass, and remains after drying a negligible residual moisture with the most economical Energy.

Der Erfindung liegt daher die Aufgabe zugrunde, ein energiesparendes Trocknungsverfahren zu schaffen, mit dem auch eine schnelle Trocknung von Bauteilen mit komplizierter Geometrie sichergestellt wird. The invention is therefore based on the object of an energy-saving To create drying process with which also a fast drying of components with complicated geometry is ensured.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß die eingeleitete Luft mit einem Zusatzstoff mit Dipolcharakter derart angereichert wird, daß das Luftgemisch einen relativen Anteil an Zusatzstoff innerhalb eines vorgegebenen steuerbaren Bereiches von 20% bis 90% aufweist, und daß der Anteil an Zusatzstoff im Trocknungsraum eingehalten wird.The object is achieved in that the air introduced with an additive with a dipole character is enriched so that the air mixture has a relative Share of additive within a given controllable range from 20% to 90%, and that the proportion of additive in the drying room complied with becomes.

Mit dem erfindungsgemäßen Verfahren wird vorteilhafterweise eine schnelle Trocknung von Bauteilen beliebiger Geometrie bei verhältnismäßig geringen Temperaturen sowie bei einer gleichmäßigen Erwärmung der Lackoberflächen erzielt, was besonders für von im Luftfahrzeugbau verwendete Aluminiumbauteile oder Bauteilen aus Faserverbundwerkstoffen von Vorteil ist. Das erfindungsgemäße Verfahren macht sich in vorteilhafterweise den Umstand zunutze, daß zum Ablauf einer wirkungsvolleren chemischen Vernetzung ein Teil des Zusatzstoffes für die die Einzelteile oder montierten Baugruppen umgebende Luft als Reaktionspartner dient. Das aus Luft und einem beigemischten Zusatzstoff hergestellte Luftgemisch umströmt die im Trocknungsraum befindlichen Bauteile oder Baugruppen, wobei die Moleküle des Luftgemisches von den Mikrowellen in Schwingungen versetzt werden. Die auf diese Weise im Luftgemisch entstehende Wärmeenergie wird auf die zu trocknende Lackoberfläche übertragen und begünstigt die chemische Vernetzung. Hierbei können beispielsweise neun Mikrowellenmodule mit jeweils vier Magnetrons mit einer Hochfrequenzleistung von z. B. jeweils 1,2 KW verwendet werden. Hieraus ergibt sich die gesamte aufgewendete Leistung von 43,2 KW, wovon etwa 36 KW nutzbar sind.The method according to the invention is advantageous fast drying of components of any geometry at relatively low temperatures and at a uniform heating of the paint surfaces achieved what is special for aluminum components used in aircraft construction or components made of fiber composite materials are an advantage is. The method according to the invention advantageously makes itself take advantage of the fact that to run a more effective chemical crosslinking is part of the additive for those surrounding the individual parts or assembled assemblies Air serves as a reaction partner. That from air and one admixed additive produced air mixture flows around the components or assemblies in the drying room, the molecules of the air mixture from the microwaves in Vibrations are set. That way in the air mixture resulting heat energy is on the to be dried Paint surface transfer and favors chemical cross-linking. Here, for example, nine microwave modules with four magnetrons each with a high-frequency power from Z. B. 1.2 KW each can be used. From this results the total output of 43.2 KW, of which about 36 KW can be used.

Ausgestaltungen des Verfahrens sind in den Unteransprüchen 2 bis 9 beschrieben. Diese Ausgestaltungen bestehen beispielsweise darin, daß die Einzelteile auf einem Förderband - vorzugsweise in auf dem Förderband befindlichen Behältnissen - durch den Trocknungsraum transportiert werden. Auch kann ein Kettenförderer mit hängend durch den Trocknungsraum transportierten Einzelteilen oder Baugruppen oder auch ein Chargentrockner im stationären Betrieb verwendet werden.Refinements of the method are in the Subclaims 2 to 9 described. These configurations consist, for example, that the items on one Conveyor belt - preferably in those located on the conveyor belt Containers - to be transported through the drying room. A chain conveyor can also hang through the drying room transported individual parts or assemblies or also used a batch dryer in stationary operation become.

Der Zusatzstoff, vorzugsweise Wasserdampf, kann zur Erzeugung des vorgebenen Feuchteanteiles entweder durch in der Umgebung der Magnetrons der Mikrowellenmodule angeordnete Feinvernebelungsdüsen oder mittels regelbarer Klimatisierungsgeräte in den Trocknungsraum eingeleitet werden. Auch ist vorgesehen, daß als Zusatzstoff zur Erzeugung des vorgegebenen Feuchteanteiles eine in der Nähe der Magnetrons der Mikrowellenmodule angeordnete Lösung mit bekanntem Dampfdruck verwendet wird, die über ein Gebläse in den Trocknungsraum eingeleitet wird.The additive, preferably water vapor, can either generate the specified moisture content by in the vicinity of the magnetrons of the microwave modules arranged fine atomizing nozzles or by means of adjustable Air conditioning units are introduced into the drying room. It is also provided that as an additive to generate the predetermined moisture content in the Solution arranged near the magnetrons of the microwave modules with known vapor pressure is used by a blower is introduced into the drying room.

Um auf Strukturen mit komplizierten Geometrien aufgebrachte Lacke nach dem erfindungsgemäßen Verfahren trocknen zu können, ist die Erzeugung eines inhomogenen Mikrowellenfeldes im Trocknungsraum erforderlich. Dieses kann durch eine gezielte Steuerung der Hochfrequenzleistung der Magnetrons und/oder des Verhältnisses aus Luft und Zusatzstoff erfolgen. To be applied to structures with complicated geometries To be able to dry paints by the process according to the invention, is the generation of an inhomogeneous microwave field required in the drying room. This can through targeted control of the high-frequency power of the Magnetrons and / or the ratio of air and additive respectively.

Neben den eingangs erwähnten Ein- oder Zweikomponentenlacken auf Epoxyd- oder Polyurethanbasis ist mit Hilfe des erfindungsgemäßen Verfahrens auch die Trocknung von Lacken auf anderer chemischer Basis möglich, beispielsweise von Alkydharz-Lacken.In addition to the one- or two-component paints mentioned at the beginning is based on epoxy or polyurethane with the help of the invention Process also the drying of paints other chemical basis possible, for example alkyd resin paints.

Die Aufgabe wird erfindungsgemäß auch dadurch gelöst, daß die Lacke mit einem polarisierbaren Dielektrikum als Zusatzstoff angereichert werden, und daß der Zusatzstoff während der Mikrowellenbestrahlung direkt zur Temperaturerhöhung der Lackschicht und/oder durch Austritt aus der Lackschicht in die die Einzelteile oder Baugruppen umgebenden Luft und damit zur Temperaturerhöhung des Gemisches aus Luft und Zusatzstoff herangezogen wird.The object is also achieved in that the coatings with a polarizable dielectric as an additive be enriched and that the additive during the microwave radiation directly to increase the temperature of the Lacquer layer and / or by exiting the lacquer layer in the air surrounding the individual parts or assemblies and thus to increase the temperature of the mixture of air and additive is used.

Weiterbildungen dieses Verfahrens sind darin zu sehen, daß

  • der Zusatzstoff den Lacken vor dem Auftragen auf die Einzelteile oder Baugruppen zugegeben wird, daß
  • der Zusatzstoff den Lacken bei deren Auftragung auf die Einzelteile oder Baugruppen zugegeben wird, daß
  • die Verwendung von Lacken auf Alkydharzbasis, Acrylharzbasis oder anderer chemischer Basis neben den eingangs erwähnten Lacken auf Epoxyd- oder Polyurethanbasis vorgesehen ist, und daß
  • als Zusatzstoff für das Gemisch aus Luft und Zusatzstoff aus wasserbasierenden oder wasserverdünnbaren Lacken gewonnener Wasserdampf verwendet wird.
Further developments of this process can be seen in the fact that
  • the additive is added to the paints before application to the individual parts or assemblies that
  • the additive is added to the paints when they are applied to the individual parts or assemblies that
  • the use of lacquers based on alkyd resin, acrylic resin or other chemical base is provided in addition to the lacquers mentioned at the beginning on epoxy or polyurethane basis, and that
  • Water vapor obtained as an additive for the mixture of air and additive from water-based or water-dilutable paints is used.

Claims (14)

  1. A process for energy-saving drying of coatings on metallic or non-metallic individual components or assemblies of any structure and of complicated geometry by a continuous process or in stationary operation in a heated drying chamber, in particular of coatings on aluminium components or on components of fibre composites for aircraft, water-thinnable or solvent-containing epoxy- or polyurethane-based one- or two-component coatings preferably being used as the coatings, at least one microwave module being used as heat source in the drying chamber for producing microwaves introduced into the drying chamber by means of waveguides with defined outlet openings and air being introduced into the drying chamber to flow around the individual components or assemblies, characterised in that the air introduced is enriched with an additive of dipolar nature in such a way that the air mixture comprises a relative content of additive within a preset controllable range of from 20% to 90%, and in that the content of additive is maintained in the drying chamber.
  2. A process according to claim 1, characterised in that the individual components or assemblies are transported through the drying chamber on a conveyor belt.
  3. A process according to claim 1, characterised in that a chain conveyor is used with individual components or assemblies transported in suspended manner through the drying chamber.
  4. A process according to claim 1, characterised in that a batch dryer is used in stationary operation.
  5. A process according to claim 1, characterised in that steam is used as the additive.
  6. A process according to claim 1 or claim 5, characterised in that the additive is introduced into the drying chamber through finely atomising nozzles arranged in the vicinity of the magnetron of the microwave modules to produce the predetermined moisture content.
  7. A process according to claim 1 or claim 5, characterised in that a solution with known vapour pressure arranged in the vicinity of the magnetron of the microwave modules is used as additive to produce the predetermined moisture content, which solution is introduced into the drying chamber via a blower.
  8. A process according to claim 1 or claim 5, characterised in that the additive for producing the predetermined moisture content is introduced into the drying chamber by means of adjustable air-conditioning apparatus.
  9. A process according to one of claims 1 to 8, characterised by the production of a nonhomogeneous microwave field in the drying chamber.
  10. A process for energy-saving drying of coatings on metallic or non-metallic individual components or assemblies of any structure and of complicated geometry by a continuous process or in stationary operation in a heated drying chamber, in particular of coatings on aluminium components or on components of fibre composites for aircraft, water-thinnable or solvent-containing epoxy- or polyurethane-based one- or two-component coatings preferably being used as the coatings, at least one microwave module being used as heat source in the drying chamber for producing microwaves introduced into the drying chamber by means of waveguides with defined outlet openings,
    characterised in that the coatings are enriched with a polarisable dielectric as additive, and in that the additive is used during microwave irradiation directly to raise the temperature of the coating layer and/or by discharge from the coating layer into the air surrounding the individual components or assemblies to raise the temperature of the air/additive mixture.
  11. A process according to claim 10, characterised in that the additive is added to the coatings prior to application to the individual components or assemblies.
  12. A process according to claim 10, characterised in that the additive is added to the coatings during the application thereof to the individual components or assemblies.
  13. A process according to one of claims 10, 11 or 12, characterised by the use of alkyd resin-based or acrylic resin-based coatings or those with another chemical basis.
  14. A process according to one of claims 10 to 13, characterised in that steam obtained from water-based or water-thinnable coatings is used as the additive for the air/additive mixture.
EP98107504A 1997-05-22 1998-04-24 Process for drying paints on metallic or non-metallic components or assemblies of any structure Expired - Lifetime EP0880001B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19721461 1997-05-22
DE19721461A DE19721461C2 (en) 1997-05-22 1997-05-22 Process for drying paints on metallic or non-metallic individual parts or assembled assemblies of any structure
DE19730879A DE19730879B4 (en) 1997-05-22 1997-07-18 Method for drying paints on metallic or non-metallic individual parts or assembled assemblies of any structure
DE19730879 1997-07-18

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EP0880001A1 EP0880001A1 (en) 1998-11-25
EP0880001B1 true EP0880001B1 (en) 2002-09-18

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EP98107504A Expired - Lifetime EP0880001B1 (en) 1997-05-22 1998-04-24 Process for drying paints on metallic or non-metallic components or assemblies of any structure

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US (1) US5974687A (en)
EP (1) EP0880001B1 (en)
AT (1) ATE224524T1 (en)
CA (1) CA2238314C (en)
DE (3) DE19721461C2 (en)
DK (1) DK0880001T3 (en)
ES (1) ES2184165T3 (en)
NO (1) NO317954B1 (en)

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DE19853548B4 (en) * 1998-11-20 2005-06-02 B+M Surface Systems Gmbh Process for drying paint and paint sludge
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DE19721461C2 (en) 1999-03-11
CA2238314A1 (en) 1998-11-22
NO982263L (en) 1998-11-23
CA2238314C (en) 2005-09-06
DE19721461A1 (en) 1998-11-26
DE19730879A1 (en) 1999-02-11
ATE224524T1 (en) 2002-10-15
US5974687A (en) 1999-11-02
ES2184165T3 (en) 2003-04-01
EP0880001A1 (en) 1998-11-25
DE59805571D1 (en) 2002-10-24
DK0880001T3 (en) 2003-01-27
NO982263D0 (en) 1998-05-18
DE19730879B4 (en) 2006-09-14

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