EP2281163B1 - Method of drying and/or curing an organic coating on a continuously running metal strip, and device for implementing this method - Google Patents

Method of drying and/or curing an organic coating on a continuously running metal strip, and device for implementing this method 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
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EP08805555.3A
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German (de)
French (fr)
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EP2281163A1 (en
Inventor
Pierre-Jerôme BORREL
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Clecim SAS
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Primetals Technologies France SAS
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    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Health & Medical Sciences (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Textile Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Drying Of Solid Materials (AREA)
  • Coating Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

L'invention se rapporte de manière générale au séchage et/ou la cuisson de revêtements organiques tels que des peintures ou des vernis sur des bandes métalliques en défilement continu.The invention relates generally to drying and / or baking organic coatings such as paints or varnishes on metal strips in continuous scrolling.

Des revêtements organiques tels que des peintures ou des vernis sont déposés sous forme liquide sur les bandes d'acier en défilement continu. Il est donc nécessaire de procéder à un séchage et/ou une cuisson de ces revêtements avant que lesdites bandes puissent être défléchies ou soutenues par des rouleaux et, bien entendu, avant d'être bobinées.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.

Afin d'accélérer leur séchage et donc de diminuer en conséquence la longueur des installations, il est connu de l'homme de l'art d'utiliser des dispositifs de chauffage pour accélérer l'évaporation des solvants contenus dans ces revêtements de nature organique. Après enduction, les bandes d'acier passent donc dans une enceinte chauffée où les solvants sont évaporés et extraits de manière continue afin de limiter leur concentration dans l'enceinte en deçà du seuil d'explosivité. Ils sont ensuite dirigés vers des unités d'incinération.In order to accelerate their drying and consequently to reduce the length of the installations, it is known to those skilled in the art to use heating devices to accelerate the evaporation of the solvents contained in these coatings of organic nature. After coating, the steel strips therefore pass into a heated chamber where the solvents are evaporated and extracted continuously to limit their concentration in the chamber below the explosive threshold. They are then sent to incineration units.

Une technique couramment utilisée pour l'opération de séchage consiste à chauffer la bande par induction. Ce procédé donne d'excellents résultats car les inducteurs chauffent la bande qui, à son tour, chauffe le revêtement, ce qui facilite l'évaporation des solvants.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.

Le chauffage par induction présente toutefois l'inconvénient de ne pas chauffer les parois de l'enceinte du four, ce qui a pour conséquence que leur température reste inférieure au point de rosée des solvants. Il s'ensuit des risques de condensation des vapeurs de solvants sur les parois, sur les circuits de refroidissement des inducteurs... Outre les risques d'inflammation provoqués par d'éventuelles accumulations de solvants condensés, des gouttes de condensats peuvent aussi tomber sur la bande en cours de séchage et créer des défauts d'aspect et/ou une protection insuffisante.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.

Pour pallier ces inconvénients, différentes techniques ont été développées, mettant en oeuvre un chauffage par induction des parois internes de l'enceinte d'un four, jusqu'à ce que ses parois soient à une température supérieure du point de rosée des solvants. Ainsi, le brevet américain US 4,370,357 divulgue une installation comprenant une enceinte, dans laquelle de l'azote circule de manière constante en circuit fermé, ce qui permet de porter la température de l'azote, et donc de l'enceinte, au-dessus du point de rosée du mélange d'azote et de vapeurs de solvants. L'installation comporte, dans le circuit de circulation de l'azote, un dispositif de séparation des solvants et de l'azote qui est récupéré sous forme liquide. Enfin, des dispositions complexes sont prises pour canaliser les solvants condensés sur les tuyauteries de refroidissement des inducteurs.To overcome these disadvantages, various techniques have been developed, using an induction heating of the inner walls of the enclosure of an oven, until its walls are at a temperature above the dew point of the solvents. Thus, the US patent US4,370,357 discloses an installation comprising an enclosure, in which nitrogen circulates in a closed circuit in a constant manner, which makes it possible to raise the temperature of the nitrogen, and thus of the enclosure, above the dew point of the mixture of nitrogen and solvent vapors. The installation comprises, in the nitrogen circulation circuit, a device for separating solvents and nitrogen which is recovered in liquid form. Finally, complex arrangements are made to channel the condensed solvents on the cooling pipes of the inductors.

L'homme de l'art a cherché à améliorer l'installation décrite dans le brevet US 4,370,357 en mettant en place, dans une enceinte de chauffage comprenant des inducteurs, une insufflation continue d'air chaud dans l'enceinte afin de réchauffer les inducteurs et les parois au-dessus du point de rosée des solvants, ainsi qu'une une extraction continue du mélange air chaud/vapeurs de solvants qui est ensuite incinéré. Un tel procédé de chauffage, qui est plus simple que celui du brevet américain US 4,370,357 , est notamment décrit dans le brevet européen EP 0 744 222 . Il présente toutefois l'inconvénient de consommer beaucoup plus d'énergie que celui du brevet américain US 4,370,357 , notamment pour réchauffer l'air d'une part et pour alimenter les brûleurs d'incinération d'autre part.Those skilled in the art have sought to improve the installation described in the patent US4,370,357 by setting up, in a heating chamber comprising inductors, continuous insufflation hot air in the enclosure to heat the inductors and walls above the dew point of the solvents, as well as a continuous extraction of the hot air / solvent vapor mixture which is then incinerated. Such a heating method, which is simpler than that of the US patent US4,370,357 , is in particular described in the European patent EP 0 744 222 . However, it has the disadvantage of consuming a lot more energy than that of the US patent US4,370,357 , in particular to heat the air on the one hand and to supply the incineration burners on the other hand.

Par ailleurs, ont été développées des enceintes de chauffage comportant des dispositifs supplémentaires de chauffage des parois de l'enceinte, qui sont indépendants des moyens de chauffage de la bande. Ainsi, dans la demande de brevet européen EP 1 508 383 des moyens de chauffage supplémentaires tels que des moyens de chauffage par induction ou par résistance électrique ont été mis en place dans l'enceinte du four pour le chauffage des parois. De tels procédés résolvent certes le problème de la condensation, mais cela au prix d'une consommation importante d'énergie qui ne contribue même pas directement au processus de cuisson.Furthermore, have been developed heating enclosures having additional devices for heating the walls of the enclosure, which are independent of the heating means of the strip. Thus, in the European patent application EP 1 508 383 additional heating means such as induction heating means or electric resistance have been put in place in the furnace enclosure for heating the walls. Such processes solve the problem of condensation, but at the cost of a significant consumption of energy that does not even contribute directly to the cooking process.

Enfin, dans la demande de brevet européen EP 0 132 248 , des moyens de chauffage autres que l'induction consistant notamment en des sources de radiations infrarouges ont été mis en place dans une enceinte de chauffage pour chauffer à la fois le revêtement et l'atmosphère de l'enceinte. Même si le brevet européen EP 0 132 248 indique que le bilan énergétique d'une telle installation est amélioré par rapport à des installations fonctionnant avec des moyens de chauffage par induction, celle-ci nécessite néanmoins un balayage constant de l'enceinte par un gaz inerte à cause du risque d'inflammation des vapeurs de solvant au contact des éléments actifs des radiants infrarouges. Bien que la nature de ces éléments radiants ne soit pas explicitement décrite dans EP 0 132 248 , l'homme de l'art peut raisonnablement penser qu'ils sont électriques (et donc non catalytiques), puisque leur mise en place dans l'enceinte nécessite l'absence d'oxygène dans l'enceinte. L'invention se propose en conséquence d'apporter une solution permettant de conserver tous les avantages du chauffage par induction tout en résolvant les problèmes de condensation des vapeurs de solvants, et sans toutefois présenter les inconvénients des solutions de l'art antérieur susmentionnées.Finally, in the European patent application EP 0 132 248 , heating means other than induction consisting in particular of infrared radiation sources have been set up in a heating chamber to heat both the coating and the atmosphere of the enclosure. Even if the European patent EP 0 132 248 indicates that the energy balance of such an installation is improved compared to installations operating with induction heating means, it nevertheless requires a constant sweep of the chamber by an inert gas because of the risk of ignition of solvent vapors in contact with the active elements of infrared radiants. Although the nature of these radiant elements is not explicitly described in EP 0 132 248 those skilled in the art can reasonably think that they are electric (and therefore non-catalytic), since their establishment in the chamber requires the absence of oxygen in the chamber. The invention therefore proposes to provide a solution to retain all the advantages of induction heating while solving the problems of condensation of solvent vapors, and without however having the disadvantages of the solutions of the prior art mentioned above.

Plus particulièrement, la présente invention a pour objet un procédé de séchage et/ou de cuisson d'un revêtement organique protecteur et/ou décoratif sur une bande métallique en défilement continu, comprenant :

  1. i) le chauffage par induction électromagnétique de la bande dans un four tunnel, qui comporte une enceinte avec des parois internes chaudes, pour évaporer les solvants contenus dans le revêtement organique et assurer le séchage et/ou la cuisson du revêtement, les solvants étant extraits en continu de l'enceinte de four, et
  2. ii) le chauffage de l'enceinte pour maintenir lesdites parois internes à une température égale ou supérieure au point de rosée des solvants.
More particularly, the subject of the present invention is a process for drying and / or firing a protective and / or decorative organic coating on a continuously moving metal strip, comprising:
  1. i) electromagnetic induction heating of the strip in a tunnel furnace, which comprises an enclosure with hot internal walls, for evaporating the solvents contained in the organic coating and ensuring the drying and / or cooking of the coating, the solvents being extracted continuous furnace enclosure, and
  2. ii) heating the enclosure to maintain said inner walls at a temperature equal to or greater than the dew point of the solvents.

Le chauffage par induction électromagnétique de la bande munie de son revêtement présente l'avantage de chauffer le revêtement organique (par exemple une peinture ou un vernis) par un apport de chaleur en provenance de la bande qui est transmise par conduction au revêtement, selon un gradient d'établissant depuis l'interface entre le revêtement et la bande vers la surface externe libre du revêtement, ce qui facilite l'évaporation des solvants.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.

Le chauffage de l'enceinte pour maintenir la température de ses parois internes au-dessus du point de rosée des solvants permet de limiter les risques de condensation des vapeurs des solvants sur les parois de l'enceinte notamment, ou sur les circuits de refroidissement des indicateurs.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.

Selon la présente invention, le chauffage par induction électromagnétique de la bande munie de son revêtement est couplé, de manière simultanée à deux autres modes de chauffage complémentaires du premier mode par induction, à savoir un chauffage par rayonnement infrarouge et un chauffage par convection au moyen d'un gaz de combustion, et le chauffage de l'enceinte est réalisé par convection au moyen du même gaz de combustion que celui utilisé pour le chauffage par convection de la bande.According to the present invention, 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.

La bande métallique peut être en acier, notamment galvanisé, ou en aluminium.The metal strip may be steel, especially galvanized, or aluminum.

Le procédé suivant l'invention offre de nombreux avantages par rapport aux procédés connus de l'art antérieur évoqués précédemment.The process according to the invention offers many advantages over the previously known processes of the prior art mentioned above.

Ainsi, le chauffage de la bande par rayonnement infrarouge présente l'avantage que le rayonnement infrarouge pénètre à l'intérieur du revêtement jusqu'à l'interface entre la bande et le revêtement, de sorte que le séchage et/ou la cuisson du revêtement s'opère à partir de la surface externe du revêtement jusqu'à l'interface avec la bande. Cela permet d'éviter la formation de boursouflures dans le revêtement, tout en assurant une température de cuisson élevée.Thus, 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.

Par ailleurs, le chauffage par combustion à l'aide d'un gaz de combustion s'applique à la fois à l'enceinte et à la bande, et plus particulièrement au revêtement selon un gradient s'établissant depuis la surface externe libre du revêtement vers son interface avec la bande.Furthermore, the 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.

De manière particulièrement avantageuse, le chauffage par rayonnement infrarouge est réalisé à l'aide d'au moins un émetteur de rayonnements infrarouges à brûleur catalytique disposé dans l'enceinte du four tunnel, ledit émetteur comprenant une structure catalytique composée d'un élément catalytique imprégné d'une matière catalytique de combustion à la surface duquel est injecté un gaz de combustion ou un mélange d'air et de gaz de combustion, et en ce que le chauffage par convection des parois de l'enceinte et de la bande est assuré par l'oxydation du gaz de combustion qui est injecté à la surface de l'élément catalytique dudit émetteur de rayonnements infrarouges.Particularly advantageously, 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.

Il s'agit d'un émetteur de rayonnements infrarouges (ou radiant catalytique à gaz) qui présente un très large spectre de longueur d'onde, idéalement entre 3 et 10 µm, couvrant toute la gamme des longueurs d'ondes absorbées par les revêtements organiques, ce qui permet d'assurer ainsi un séchage et/ou une cuisson efficace du revêtement organique par rayonnement.It is a transmitter of infrared radiation (or catalytic radiant gas) which has a very broad spectrum of wavelength, ideally between 3 and 10 microns, covering the entire range of wavelengths absorbed by the coatings organic, which thus ensures drying and / or effective cooking of the organic coating by radiation.

A titre de radiants catalytiques à gaz utilisable selon la présente invention, on peut notamment citer ceux décrits dans le brevet européen EP 0 754 911 . Ce sont des émetteurs de rayonnements infrarouges à brûleur catalytique comportant :

  • un caisson,
  • une structure catalytique constituée d'un élément imprégné d'une matière catalytique de combustion,
  • un organe d'injection d'un gaz combustible situé dans le caisson et débouchant à la surface de l'élément imprégné,
  • un générateur d'air à turbine envoyant de l'air sous pression dans le caisson sur toute la surface de l'élément imprégné, et
  • des moyens de chauffage électrique de l'élément imprégné.
As catalytic gas radiants usable according to the present invention, there may be mentioned those described in the European patent EP 0 754 911 . Those are infrared radiation emitters with catalytic burner comprising:
  • a box,
  • a catalytic structure consisting of an element impregnated with a catalytic combustion material,
  • an injection member for a fuel gas located in the box and opening on the surface of the impregnated element,
  • a turbine air generator sending pressurized air into the box over the entire surface of the impregnated member, and
  • means for electrically heating the impregnated element.

On peut également citer les thermo-réacteurs commercialisés par la société SUNKISS.Mention may also be made of thermo-reactors marketed by SUNKISS.

L'oxydation du gaz combustible, par exemple du propane ou du gaz naturel, en surface des éléments catalytiques apporte en outre l'énergie nécessaire au chauffage par convection de l'enceinte et, en partie l'énergie nécessaire au séchage et/ou la cuisson du revêtement sans toutefois atteindre les températures élevées propres à la combustion vive.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.

D'autre part, les structures catalytiques des radiants catalytiques à gaz assurent une oxydation partielle des vapeurs de solvants qui offre le double avantage de renforcer le chauffage par convection et de réduire la quantité de vapeurs de solvants à incinérer, ce qui améliore encore le bilan thermique de l'opération.On the other hand, 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.

L'oxydation des vapeurs de solvants et la relativement basse température d'oxydation en surface des éléments catalytiques permettent de rester en dehors des conditions d'auto-inflammation et il n'est donc pas nécessaire d'assurer un balayage de l'enceinte avec un gaz neutre.The oxidation of the solvent vapors and the relatively low oxidation temperature at the surface of the catalytic elements make it possible to remain outside the conditions of auto-ignition and it is therefore not possible to necessary to ensure a sweep of the enclosure with a neutral gas.

La présente invention a également pour objet un dispositif de cuisson et/ou séchage d'un revêtement organique protecteur et/ou décoratif préalablement déposé sur une bande métallique, qui peut être en acier, notamment galvanisé, ou en aluminium, ledit procédé comprenant :

  • un four tunnel comportant une enceinte avec des parois internes chaudes, ladite enceinte étant équipés :
    • ▪ de moyens de chauffage par induction électromagnétique de la bande qui traverse le four, et
    • ▪ de moyens de chauffage des parois de l'enceinte, et
  • des moyens pour déplacer la bande munie de son revêtement organique d'une entrée située à une première extrémité de l'enceinte du four à une sortie située à l'autre extrémité de ladite enceinte.
The subject of the present invention is also a device for cooking and / or drying a protective and / or decorative organic coating previously deposited on a metal strip, which may be made of steel, in particular galvanized steel, or of aluminum, said process comprising:
  • a tunnel furnace comprising an enclosure with hot internal walls, said enclosure being equipped with:
    • ▪ electromagnetic induction heating means of the band that passes through the oven, and
    • ▪ means of heating the walls of the enclosure, and
  • means for moving the strip with its organic coating from an inlet at a first end of the furnace chamber to an outlet at the other end of said enclosure.

Selon l'invention, les moyens de chauffage des parois internes de l'enceinte comprennent des moyens de chauffage par convection à l'aide d'un gaz de combustion, qui constituent également des moyens de chauffage de la bande munie de son revêtement, et le dispositif selon l'invention comporte en outre des moyens de chauffage par rayonnement infrarouge de ladite bande munie de son revêtement.According to the invention, 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.

Avantageusement, les moyens de chauffage par rayonnement infrarouge et les moyens de chauffage par convection sont constitués par au moins un émetteur de rayonnements infrarouges à brûleur catalytique, comprenant une structure catalytique composée d'un élément catalytique imprégné d'une matière catalytique de combustion à la surface duquel est injecté un gaz de combustion ou un mélange d'air et de gaz de combustion.Advantageously, 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.

On utilise avantageusement dans le dispositif selon l'invention à titre d'émetteurs de rayonnements infrarouges des émetteurs tels que ceux décrits dans le brevet européen EP 0 754 911 B1 ou encore des thermoréacteurs de la société SUNKISS, comme indiqué ci-dessus.Advantageously, emitters such as those described in the European patent are used as emitters of infrared radiation in the device according to the invention. EP 0 754 911 B1 or even thermoreactors from SUNKISS, as indicated above.

Avantageusement, les moyens de chauffage par induction comprennent une pluralité d'inducteurs répartis le long de l'enceinte, entre l'entrée du four et la sortie, dans le sens de défilement de la bande.Advantageously, 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.

Avantageusement, les moyens de chauffage par infrarouge comprennent une pluralité d'émetteurs de rayonnements infrarouges à brûleur catalytique répartis le long de l'enceinte dans le sens de défilement et disposés de part et d'autre de la bande.Advantageously, 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.

De préférence, le chauffage par induction est assuré par plusieurs inducteurs répartis le long de l'enceinte, dans le sens de défilement de la bande, et le chauffage aux infrarouges par des batteries de radiants catalytiques (ou émetteurs de rayonnements infrarouges) disposées de part et d'autre de la bande, alternativement avec les inducteurs. Cette répartition fractionnée permet de moduler l'énergie de cuisson apportée par chaque moyen de chauffage le long de la bande. Par exemple, en suivant le sens de défilement de la bande, l'essentiel de l'énergie peut être d'abord apportée par induction puis, progressivement, la part de l'induction diminue au profit du rayonnement. D'autres répartitions des moyens de chauffage (en particulier les inducteurs et les radiants catalytiques) peuvent également être envisagées en fonction de la modulation souhaitée de l'énergie de cuisson.Preferably, 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.

Afin d'adapter la répartition des énergies de cuisson entre induction et infrarouges le long de la bande, le dispositif selon l'invention contient avantageusement un système de contrôle, qui est apte à régler le nombre et l'emplacement des inducteurs en service ainsi que leur alimentation électrique. Ce même système de contrôle est également apte à régler le nombre et l'emplacement des radiants en service ainsi que leur alimentation en gaz ou en mélange air/gaz.In order to adapt the distribution of the firing energies between induction and infrared along the strip, 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.

D'autres caractéristiques avantageuses de l'invention apparaîtront dans la description suivante de certains modes de réalisation donnés à titre de simple exemple et représentés sur les dessins annexés :

  • la figure est un schéma de principe en coupe d'un premier exemple de dispositif de cuisson et/ou de séchage selon l'invention,
  • la figure 2 est un schéma de principe en coupe d'un second exemple de dispositif de cuisson et/ou de séchage selon l'invention.
Other advantageous features of the invention will appear in the following description of certain embodiments given as a simple example and shown in the accompanying drawings:
  • the figure is a block diagram in section of a first example of a cooking and / or drying device according to the invention,
  • the figure 2 is a block diagram in section of a second example of a cooking and / or drying device according to the invention.

Le dispositif de séchage et/ou cuisson représenté sur la figure 1 comprend

  • un four 1, de préférence vertical et formant tunnel, qui est traversé par une bande d'acier 2 sur laquelle a été préalablement déposée un revêtement organique de type vernis ou peinture , et
  • des moyens 3 (par exemple des rouleaux déflecteurs) pour déplacer la bande 2 d'une entrée E située à une première extrémité de l'enceinte 11 du four 1 à une sortie S située à l'autre extrémité de ladite enceinte 11,
The drying and / or cooking device represented on the figure 1 comprises
  • an oven 1, preferably vertical and forming a tunnel, which is traversed by a steel strip 2 on which has previously been deposited an organic coating varnish type or paint, and
  • means 3 (for example baffle rollers) for moving the strip 2 of an inlet E situated at a first end of the enclosure 11 of the oven 1 to an output S located at the other end of said enclosure 11,

Le four 1 comporte une enceinte 11 à parois internes chaudes (non représentées sur les figures 1 et 2), qui est équipée :

  • ▪ d'une pluralité d'inducteurs 4 répartis le long de l'enceinte 11, et
  • ▪ d'une pluralité d'émetteurs infrarouges à brûleur catalytique 5 (ou radiants catalytiques) disposés de part et d'autre de la bande 2 alternativement avec les inducteurs 3.
The oven 1 comprises an enclosure 11 with hot internal walls (not shown on the figures 1 and 2 ), which is equipped with:
  • A plurality of inductors 4 distributed along the enclosure 11, and
  • ▪ a plurality of infrared emitters with catalytic burner 5 (or catalytic radiants) disposed on either side of the strip 2 alternatively with the inductors 3.

Le dispositif 1 comporte également une chambre de récupération 6 des gaz oxydés et des solvants résiduels, qui sont dirigés vers un dispositif d'incinération 7.The device 1 also comprises a recovery chamber 6 for oxidized gases and residual solvents, which are directed towards an incineration device 7.

La chambre de récupération 6 est disposée entre deux inducteurs 4 dans le tiers médian de l'enceinte 11 du four 1.The recovery chamber 6 is disposed between two inductors 4 in the middle third of the chamber 11 of the furnace 1.

Le dispositif 1 de séchage et/ou cuisson représenté sur la figure 2 diffère de celui représenté sur la figure 1 par la position de la chambre de récupération 6, qui se trouve dans le tiers supérieur de l'enceinte 11.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.

Par ailleurs, la figure 2 montre également un exemple possible de répartition des puissances des différents moyens de chauffage 4, 5 disposés le long de l'enceinte 11 avec, en bas de l'enceinte, des inducteurs fonctionnant à pleine puissance (W) afin de faciliter le chauffage du revêtement par conduction à partir de la bande 2 et favoriser la vaporisation des solvants. La puissance des inducteurs diminue ensuite pour atteindre une faible puissance (W/4) en haut de l'enceinte. Les radiants catalytiques fonctionnent, au contraire, à pleine puissance (W) en haut de l'enceinte 11 afin de favoriser la réticulation du revêtement et à basse puissance (W/4) en bas afin de ne pas entraver l'effet bénéfique du chauffage par la bande 2 sur l'évaporation des solvants.Moreover, 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. On the contrary, 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.

Claims (10)

  1. Method of drying and/or curing an organic protective and/or decorative coating on a continuously running metal strip, comprising:
    i) heating of said strip (2) by electromagnetic induction in a tunnel furnace (1), comprising an enclosure (11) with hot internal walls (12) in order to evaporate the solvents contained in the composition of the organic coating and ensure the drying and/or curing of the coating, the solvents being continuously extracted from the enclosure (11) of the furnace (1), and
    ii) heating of the enclosure (11) in order to maintain said internal walls (12) at a temperature equal to or greater than the dew point of the solvents,
    characterised in that heating of said strip (2) by electromagnetic induction is coupled simultaneously and complementarily with heating by infrared radiation and heating by convection by means of a combustion gas and
    in that heating ii) of the enclosure (11) of the furnace (1) is performed by convection by means of the same combustion gas as that used for heating said strip (2) by convection, and
    in that a distribution of the different modes of heating the strip (2) changes in the enclosure (11) of the furnace (1) depending on the direction of travel (8) of the strip (2) in said enclosure (11), the supply of heat by induction being greatest at the inlet (E) to the enclosure (11) of the furnace (1) and the supply of heat by radiation and by convection being greatest at the outlet (S) from the enclosure (11) of the furnace (1), with a gradual decrease in the supply of heat by induction concomitantly with a gradual increase in the supply of heat by convection and by radiation between the inlet to (E) and the outlet (S) from the enclosure (11) depending on the direction of travel (8) of the strip (2).
  2. Method according to claim 1, characterised in that heating by infrared radiation is performed by means of at least one infrared radiation emitter with a catalytic burner (5) placed in the enclosure (11) of the furnace (1), said emitter (5) comprising a catalytic structure made up of a catalytic element impregnated with a catalytic combustion material onto the surface of which a combustion gas or a mixture of air and combustion gas is injected, and in that the heating by convection of the walls (12) of the enclosure (11) and the strip (2) is provided by oxidation of the combustion gas which is injected onto the surface of the catalytic element of said infrared radiation emitter (5).
  3. Method according to claim 2, characterised in that the infrared radiation has a wavelength between 3 and 10 µm.
  4. Method according to claim 2 or 3, characterised in that the solvents evaporated during heating of the steel strip (2) are partially oxidised on the catalytic structure of the infrared radiation emitters with catalytic burners (5).
  5. Device for curing and/or drying of an organic protective and/or decorative coating first deposited on a metal strip, comprising:
    - a tunnel furnace (1) comprising an enclosure (11) with hot internal walls (12), said enclosure (11) being fitted with:
    ▪ means of heating by electromagnetic induction (4) of the strip (2) passing through the furnace (1), and
    ▪ means of heating (5) the walls of the enclosure, and
    - means (3) for moving the strip (2) with its organic coating (21) from an inlet (E) located at a first end of the enclosure (11) of the furnace (1) to an outlet (S) located at the other end of said enclosure (11),
    said device being characterised in that the means of heating (5) the walls (12) of the enclosure (11) comprise means of heating by convection by means of a combustion gas, which also constitute means of heating the strip (2) with its coating, and
    in that said device also comprises means of heating by infrared radiation (5) of said strip (2) with its coating, and permits the implementation of the method according to one of the preceding claims.
  6. Device according to claim 5, characterised in that the means of heating by infrared radiation and the means of heating by convection (5) are made up of at least one infrared radiation emitter with catalytic burner, comprising a catalytic structure made up of a catalytic element impregnated with a catalytic combustion material onto the surface of which a combustion gas or mixture of air and combustion gas is injected.
  7. Device according to claim 5 or 6, characterised in that the means of heating by induction (4) comprise a plurality of inductors distributed along the enclosure (11) between the inlet (E) to the furnace (1) and the outlet (S) in the direction of travel (8) of the strip (2).
  8. Device according to one of claims 5 to 7, characterised in that the means of heating by infrared (5) comprise a plurality of infrared radiation emitters with catalytic burners distributed along the enclosure (11) in the direction of travel and arranged on both sides of the strip (2).
  9. Device according to claim 7 or 8, characterised in that the inductors (4) and the infrared emitters (5) are distributed alternately along the enclosure.
  10. Device according to claim 9, characterised in that it comprises a control system to adjust the number and positioning of the inductors (4) in operation and their electrical power supply as well as the number and positioning of the infrared emitters (5) in operation and their supply of combustible gas or air/combustible gas mixture.
EP08805555.3A 2008-05-08 2008-05-08 Method of drying and/or curing an organic coating on a continuously running metal strip, and device for implementing this method Active EP2281163B1 (en)

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US20110059266A1 (en) 2011-03-10
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WO2009136010A1 (en) 2009-11-12
CN102016472B (en) 2013-07-24

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