EP2281163B1 - Verfahren zum trocknen und/oder aushärten einer organischen beschichtung eines kontinuierlich laufenden metallstreifens, und vorrichtung zur durchführung dieses verfahrens - Google Patents

Verfahren zum trocknen und/oder aushärten einer organischen beschichtung eines kontinuierlich laufenden metallstreifens, und vorrichtung zur durchführung dieses verfahrens Download PDF

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Publication number
EP2281163B1
EP2281163B1 EP08805555.3A EP08805555A EP2281163B1 EP 2281163 B1 EP2281163 B1 EP 2281163B1 EP 08805555 A EP08805555 A EP 08805555A EP 2281163 B1 EP2281163 B1 EP 2281163B1
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EP
European Patent Office
Prior art keywords
heating
enclosure
strip
catalytic
furnace
Prior art date
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Not-in-force
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EP08805555.3A
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English (en)
French (fr)
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EP2281163A1 (de
Inventor
Pierre-Jerôme BORREL
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.)
Clecim SAS
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Primetals Technologies France SAS
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Publication of EP2281163A1 publication Critical patent/EP2281163A1/de
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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
    • B05D7/14—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 to metal, e.g. car bodies
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0209—Multistage baking
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
    • F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
    • 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
    • F26B3/28—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun
    • F26B3/283—Drying solid materials or objects by processes involving the application of heat by radiation, e.g. from the sun in combination with convection
    • 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
    • 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
    • B05D2252/02—Sheets of indefinite length
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0263—After-treatment with IR heaters
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0272—After-treatment with ovens
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • B05D3/0281—After-treatment with induction heating

Definitions

  • the invention relates generally to drying and / or baking organic coatings such as paints or varnishes on metal strips in continuous scrolling.
  • Organic coatings such as paints or varnishes are deposited in liquid form on the steel strips in continuous scrolling. It is therefore necessary to dry and / or bake these coatings before said strips can be deflected or supported by rollers and, of course, before being wound.
  • a commonly used technique for the drying operation is to heat the band by induction. This method gives excellent results because the inductors heat the band which, in turn, heats the coating, which facilitates the evaporation of solvents.
  • Induction heating however, has the disadvantage of not heating the walls of the furnace chamber, which has the consequence that their temperature remains below the dew point of the solvents. It follows the risk of condensation of solvent vapors on the walls, on the cooling circuits of the inductors ... In addition to the risk of ignition caused by possible accumulations of condensed solvents, drops of condensate can also fall on the band being dried and create appearance defects and / or insufficient protection.
  • the electromagnetic induction heating of the strip provided with its coating has the advantage of heating the organic coating (for example a paint or varnish) by a heat input. from the strip which is transmitted by conduction to the coating, according to a gradient of establishing from the interface between the coating and the strip towards the free outer surface of the coating, which facilitates the evaporation of solvents.
  • the organic coating for example a paint or varnish
  • Heating the enclosure to maintain the temperature of its internal walls above the dew point of the solvents makes it possible to limit the risks of condensation of solvent vapors on the walls of the enclosure in particular, or on the cooling circuits of the chambers. indicators.
  • the electromagnetic induction heating of the strip provided with its coating is coupled, simultaneously with two other modes of heating complementary to the first mode by induction, namely a heating by infrared radiation and convection heating by means of a combustion gas, and the heating of the enclosure is achieved by convection by means of the same combustion gas as that used for convection heating of the strip.
  • the metal strip may be steel, especially galvanized, or aluminum.
  • the heating of the strip by infrared radiation has the advantage that the infrared radiation penetrates inside the coating to the interface between the strip and the coating, so that the drying and / or baking of the coating takes place from the outer surface of the coating to the interface with the band. This avoids the formation of blisters in the coating, while ensuring a high cooking temperature.
  • combustion heating using a flue gas applies to both the enclosure and the strip, and more particularly to the coating according to a gradient established from the free outer surface of the coating towards its interface with the band.
  • the heating by infrared radiation is carried out using at least one infrared radiation emitter with catalytic burner disposed in the enclosure of the tunnel furnace, said emitter comprising a catalytic structure composed of an impregnated catalytic element a catalytic combustion material on the surface of which is injected a combustion gas or a mixture of air and combustion gas, and in that the convection heating of the walls of the enclosure and the strip is ensured by the oxidation of the combustion gas which is injected on the surface of the catalytic element of said infrared radiation emitter.
  • infrared radiation or catalytic radiant gas
  • infrared radiation or catalytic radiant gas
  • thermo-reactors marketed by SUNKISS.
  • the oxidation of the combustible gas, for example propane or natural gas, at the surface of the catalytic elements also provides the energy required for convection heating of the enclosure and, in part, the energy required for drying and / or cooling. baking of the coating without however reaching the high temperatures suitable for the sharp combustion.
  • combustible gas for example propane or natural gas
  • the catalytic structures of gas catalytic radiants provide partial oxidation of solvent vapors which offers the double advantage of increasing convective heating and reducing the amount of solvent vapors to be incinerated, which further improves the overall efficiency. thermal operation.
  • the heating means of the inner walls of the enclosure comprise convective heating means with the aid of a combustion gas, which also constitute heating means for the strip provided with its coating, and the device according to the invention further comprises means for heating by infrared radiation said strip provided with its coating.
  • the infrared radiation heating means and the convection heating means are constituted by at least one infrared radiation emitter with catalytic burner, comprising a catalytic structure composed of a catalytic element impregnated with a catalytic combustion material on the surface of which is injected a combustion gas or a mixture of air and combustion gas.
  • emitters such as those described in the European patent are used as emitters of infrared radiation in the device according to the invention.
  • the induction heating means comprise a plurality of inductors distributed along the enclosure, between the inlet of the furnace and the outlet, in the direction of travel of the strip.
  • the infrared heating means comprise a plurality of infrared radiation emitters with catalytic burner distributed along the enclosure in the direction of travel and arranged on either side of the strip.
  • the induction heating is provided by several inductors distributed along the enclosure, in the direction of travel of the strip, and the infrared heating by catalytic radiant batteries (or infrared radiation emitters) disposed of and other of the band, alternatively with the inductors.
  • This split distribution allows to modulate the cooking energy provided by each heating means along the band. For example, following the direction of travel of the band, most of the energy can be first brought by induction and gradually, the share of induction decreases in favor of radiation.
  • Other distributions of heating means in particular inductors and radiants catalytic can also be envisaged depending on the desired modulation of the cooking energy.
  • the device according to the invention advantageously contains a control system, which is able to adjust the number and location of the inductors in use as well as their power supply.
  • This same control system is also able to adjust the number and location of radiant in use as well as their supply of gas or air / gas mixture.
  • the device 1 also comprises a recovery chamber 6 for oxidized gases and residual solvents, which are directed towards an incineration device 7.
  • the recovery chamber 6 is disposed between two inductors 4 in the middle third of the chamber 11 of the furnace 1.
  • the device 1 for drying and / or cooking represented on the figure 2 differs from that shown on the figure 1 by the position of the recovery chamber 6, which is in the upper third of the enclosure 11.
  • the figure 2 also shows a possible example of distribution of the powers of the various heating means 4, 5 arranged along the enclosure 11 with, at the bottom of the enclosure, inductors operating at full power (W) to facilitate the heating of the coating by conduction from the band 2 and promote the vaporization of the solvents.
  • the power of the inductors then decreases to reach low power (W / 4) at the top of the speaker.
  • the catalytic radiants operate at full power (W) at the top of the enclosure 11 in order to promote the cross-linking of the coating and at low power (W / 4) at the bottom so as not to hinder the beneficial effect of the heating. by the band 2 on the evaporation of solvents.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molecular Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Biotechnology (AREA)
  • Biomedical Technology (AREA)
  • Wood Science & Technology (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (10)

  1. Verfahren zum Trocknen und/oder Aushärten einer schützenden und/oder dekorativen organischen Beschichtung auf einem kontinuierlich laufenden Metallstreifen, umfassend:
    i) Erhitzen des Streifens (2) durch elektromagnetische Induktion in einem Tunnelofen (1) umfassend einen Raum (11) mit warmen Innenwänden (12) zum Verdampfen der in der Zusammensetzung der organischen Beschichtung enthaltenen Lösemittel und Sicherstellen des Trocknens und/oder Aushärtens der Beschichtung, wobei die Lösemittel kontinuierlich aus dem Raum (11) des Ofens (1) abgeführt werden, und
    ii) Erhitzen des Raums (11), um die Innenwände (12) auf einer Temperatur größer gleich dem Taupunkt der Lösemittel zu halten,
    dadurch gekennzeichnet, dass das Erhitzen des Streifens (2) durch elektromagnetische Induktion gleichzeitig und ergänzend mit einem Erhitzen durch Infrarotstrahlung und einem Erhitzen durch Konvektion mit einem Feuerungsgas gekoppelt ist, und
    dadurch, dass das Erhitzen ii) des Raums (11) des Ofens (1) durch Konvektion mit dem gleichen Feuerungsgas erfolgt wie dem für das Erhitzen des Streifens (2) durch Konvektion, und
    dadurch, dass sich eine Verteilung der verschiedenen Arten der Erhitzung des Streifens (2) im Raum (11) des Ofens (1) gemäß der Durchlaufrichtung (8) des Streifens (2) im Raum (11) entwickelt, wobei die Hitzezuführung durch Induktion vorwiegend am Einlauf (E) des Raums (11) des Ofens (1) erfolgt und die Hitzezuführung durch Strahlung und Konvektion vorwiegend am Auslauf (S) des Raums (11) des Ofens (1) erfolgt, mit einer fortschreitenden Abnahme der Hitzezuführung durch Induktion gleichzeitig zu einer fortschreitenden Zunahme der Hitzezuführung durch Konvektion und Strahlung zwischen Einlauf (E) und Auslauf (S) des Raums (11) in der Durchlaufrichtung (8) des Streifens (2).
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Erhitzen durch Infrarotstrahlung mit wenigstens einem im Raum (11) des Ofens (1) angeordneten Infrarotstrahler mit katalytischem Brenner (5) erfolgt, wobei der Strahler (5) eine katalytische Struktur umfasst, die aus einem mit einem verbrennungskatalytischen Material gesättigten katalytischen Element besteht, an dessen Oberfläche ein Feuerungsgas oder ein Gemisch aus Luft und Feuerungsgas eingespritzt wird, und dass das Erhitzen der Wände (12) des Raums (11) und des Streifens (2) durch Konvektion durch Oxidation des Feuerungsgases gewährleistet wird, das auf der Oberfläche des katalytischen Elements des
    Infrarotstrahlers (5) eingespritzt wird.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Infrarotstrahlung eine Wellenlänge zwischen 3 und 10 µm aufweist.
  4. Verfahren nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die beim Erhitzen des Stahlstreifens (2) verdampften Lösemittel teilweise auf der katalytischen Struktur der Infrarotstrahler mit katalytischem Brenner (5) oxidiert werden.
  5. Vorrichtung zum Aushärten und/oder Trocknen einer vorab auf einem Metallstreifen aufgebrachten schützenden und/oder dekorativen organischen Beschichtung, umfassend:
    - einen Tunnelofen (1) umfassend einen Raum (11) mit warmen Innenwänden (12), wobei der Raum (11) ausgestattet ist mit:
    ▪ Mitteln zum Erhitzen des Streifens (2), der den Ofen (1) durchläuft, durch elektromagnetische Induktion (4), und
    ▪ Mitteln zum Erhitzen (5) der Wände des Raums, und
    - Mittel (3) zum Bewegen des mit der organischen Beschichtung (21) versehenen Streifens (2) von einem an einem ersten Ende des Raums (11) des Ofens (1) angeordneten Einlauf (E) zu einem am anderen Ende des Raums (11) angeordneten Auslauf (S),
    wobei die Vorrichtung dadurch gekennzeichnet ist, dass die Mittel zum Erhitzen (5) der Wände (12) des Raums (11) Mittel zum Erhitzen durch Konvektion mit einem Feuerungsgas umfassen, die ebenfalls Mittel zum Erhitzen des mit der Beschichtung versehenen Streifens (2) darstellen, und
    dadurch, dass die Vorrichtung ferner Mittel zum Erhitzen des mit der Beschichtung versehenen Streifens (2) durch Infrarotstrahlung (5) umfasst und die Durchführung des Verfahrens nach einem der vorhergehenden Ansprüche ermöglicht.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Mittel zum Erhitzen durch Infrarotstrahlung und die Mittel zum Erhitzen durch Konvektion (5) aus wenigstens einem Infrarotstrahler mit katalytischem Brenner, umfassend eine katalytische Struktur, die aus einem mit einem verbrennungskatalytischen Material gesättigten katalytischen Element besteht, an dessen Oberfläche ein Feuerungsgas oder ein Gemisch aus Luft und Feuerungsgas eingespritzt wird, bestehen.
  7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass die Mittel zum Erhitzen durch Induktion (4) eine Vielzahl von entlang dem Raum (11) zwischen dem Einlauf (E) des Ofens (1) und dem Auslauf (S) in der Durchlaufrichtung (8) des Streifens (2) angeordneten Induktoren umfassen.
  8. Vorrichtung nach einem der Ansprüche 5 bis 7, dadurch gekennzeichnet, dass die Mittel zum Erhitzen durch Infrarotstrahlung (5) eine Vielzahl von entlang dem Raum (11) in der Durchlaufrichtung verteilten und an beiden Seiten des Streifens (2) angeordneten Infrarotstrahlern mit katalytischem Brenner umfassen.
  9. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Induktoren (4) und die Infrarotstrahler (5) alternativ entlang dem Raum angeordnet sind.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass sie eine Steuerung zum Regeln der Anzahl und der Anordnung der Induktoren (4) im Betrieb sowie ihrer Stromversorgung, sowie der Anzahl und Anordnung der Infrarotstrahler (5) im Betrieb sowie ihrer Versorgung mit Feuerungsgas oder Gemisch aus Luft und Feuerungsgas umfasst.
EP08805555.3A 2008-05-08 2008-05-08 Verfahren zum trocknen und/oder aushärten einer organischen beschichtung eines kontinuierlich laufenden metallstreifens, und vorrichtung zur durchführung dieses verfahrens Not-in-force EP2281163B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2008/000650 WO2009136010A1 (fr) 2008-05-08 2008-05-08 Procédé de séchage et/ou de cuisson d'un revêtement: organique sur une bande métallique en défilement continu, et dispositif pour la mise en oeuvre de ce procédé

Publications (2)

Publication Number Publication Date
EP2281163A1 EP2281163A1 (de) 2011-02-09
EP2281163B1 true EP2281163B1 (de) 2015-12-02

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EP08805555.3A Not-in-force EP2281163B1 (de) 2008-05-08 2008-05-08 Verfahren zum trocknen und/oder aushärten einer organischen beschichtung eines kontinuierlich laufenden metallstreifens, und vorrichtung zur durchführung dieses verfahrens

Country Status (5)

Country Link
US (1) US9789514B2 (de)
EP (1) EP2281163B1 (de)
CN (1) CN102016472B (de)
BR (1) BRPI0822662B1 (de)
WO (1) WO2009136010A1 (de)

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US20040191419A1 (en) * 2003-03-26 2004-09-30 Fuji Photo Film Co., Ltd. Drying method and drying apparatus for coating layer
US8076614B2 (en) * 2006-09-01 2011-12-13 Nieco Corporation Multi-stage cooking system using radiant, convection, and magnetic induction heating, and having a compressed air heat guide
CN102950096A (zh) * 2012-11-27 2013-03-06 天津阿瑞斯工业炉有限公司 一种取向硅钢带绝缘涂层干燥装置
ITTO20130270A1 (it) 2013-04-03 2014-10-04 Itt Italia Srl Metodo ed impianto per effettuare trattamenti termici di elementi frenanti, in particolare pastiglie freno
US20150013177A1 (en) * 2013-07-15 2015-01-15 Finishing Brands Holdings Inc. Curing System and Method
CN104848666B (zh) * 2015-04-25 2017-03-29 中山市宏健节能科技有限公司 一种基于电磁发热的干燥机
DE102020004905A1 (de) * 2020-08-12 2022-02-17 Hedrich Gmbh Multiples Temperierverfahren für Werkstücke mittels Triplexofen
CN118045746B (zh) * 2024-02-23 2024-07-05 湖北国源水性新材料股份有限公司 水性pu生产涂层红外加热烘干装置

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Publication number Publication date
BRPI0822662B1 (pt) 2020-12-08
BRPI0822662A2 (pt) 2015-06-30
US20110059266A1 (en) 2011-03-10
US9789514B2 (en) 2017-10-17
CN102016472A (zh) 2011-04-13
WO2009136010A1 (fr) 2009-11-12
EP2281163A1 (de) 2011-02-09
CN102016472B (zh) 2013-07-24

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