EP2281163A1 - 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

Info

Publication number
EP2281163A1
EP2281163A1 EP08805555A EP08805555A EP2281163A1 EP 2281163 A1 EP2281163 A1 EP 2281163A1 EP 08805555 A EP08805555 A EP 08805555A EP 08805555 A EP08805555 A EP 08805555A EP 2281163 A1 EP2281163 A1 EP 2281163A1
Authority
EP
European Patent Office
Prior art keywords
enclosure
heating
strip
catalytic
infrared radiation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08805555A
Other languages
German (de)
French (fr)
Other versions
EP2281163B1 (en
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
Original Assignee
Siemens VAI Metals Technologies SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens VAI Metals Technologies SAS filed Critical Siemens VAI Metals Technologies SAS
Publication of EP2281163A1 publication Critical patent/EP2281163A1/en
Application granted granted Critical
Publication of EP2281163B1 publication Critical patent/EP2281163B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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 continuously moving metal strips.
  • 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 strip which, in turn, heats the coating, which facilitates the evaporation of the solvents.
  • Induction heating 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.
  • heating enclosures having additional devices for heating the walls of the enclosure, which are independent of the heating means of the strip.
  • additional heating means such as heating means by induction or electric resistance have been installed in the furnace chamber for heating the walls.
  • the subject of the present invention is a method for drying and / or firing a protective and / or decorative organic coating on a continuously moving metal strip, comprising: 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 drying and / or baking of the coating, the solvents being continuously extracted from the furnace enclosure, and ii) heating the enclosure to maintain said inner walls at a temperature equal to or greater than the dew point of the solvents.
  • 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 the 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 a convection heating at medium 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
  • catalytic gas radiants usable according to the present invention there may be mentioned those described in European Patent EP 0 754 911. These are infrared radiation emitters with catalytic burner comprising:
  • a housing a catalytic structure consisting of an element impregnated with a catalytic combustion material
  • an injection device for a combustible gas located in the box and opening on the surface of the impregnated element
  • 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 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 oven comprising an enclosure with hot internal walls, said enclosure being equipped with:
  • 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 European Patent EP 0 754 911 B1 or thermoreactors from SUNKISS, as indicated above, are advantageously used in the device according to the invention as infrared radiation emitters.
  • 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.
  • FIG. 1 is a schematic sectional diagram of a first example of a cooking and / or drying device according to the invention
  • Figure 2 is a schematic sectional diagram of a second example of a cooking device and or drying according to the invention.
  • the drying and / or cooking device shown in FIG. 1 comprises - a kiln 1, preferably vertical and forming a tunnel, which is crossed by a steel strip 2 on which has previously been deposited an organic coating such as varnish or paint , and means 3 (for example baffle rollers) for moving the strip 2 of an inlet E located at a first end of the chamber 11 of the oven 1 to an output S located at the other end of said enclosure 11,
  • the oven 1 comprises an enclosure 11 with hot internal walls (not shown in FIGS. 1 and 2), which is equipped with:
  • catalytic burner 5 or catalytic radiants
  • 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 drying and / or cooking device 1 shown in FIG. 2 differs from that represented in FIG. 1 by the position of FIG. the recovery chamber 6, which is in the upper third of the enclosure 11.
  • Figure 2 also shows a possible example of distribution of the power 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) in order to facilitate the heating of the coating by conduction from the strip 2 and to 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 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)

Abstract

The present invention relates to a method of drying and/or curing an organic coating on a continuously running metal strip (2), which comprises the heating of the strip (2) by electromagnetic induction in a tunnel oven (1), comprising an enclosure (11) with hot internal walls (12), and the heating of the enclosure (11). According to the invention, the heating of the strip (2) by electromagnetic induction is coupled with heating by infrared radiation and heating by convection by means of a combustion gas, and the heating of the enclosure (11) of the oven (1) is performed by convection by means of the same combustion gas as that used for heating said strip (2) by convection. The present invention also relates to a facility (1) for implementing the method of the invention.

Description

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 Process for drying and / or firing a coating: organic on a continuous moving metal strip, and device for carrying out this process
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 continuously moving metal strips.
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 thus pass into a heated chamber where the solvents are evaporated and extracted continuously in order 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. 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.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 strip which, in turn, heats the coating, which facilitates the evaporation of the 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.
Pour pallier ces inconvénients, différentes techniques ont été développées, mettant en œuvre 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 drawbacks, various techniques have been developed, implementing 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, US Pat. No. 4,370,357 discloses an installation comprising an enclosure in which nitrogen circulates steadily in a closed circuit, which makes it possible to raise the temperature of the nitrogen, and therefore 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 US Pat. No. 4,370,357 by installing, 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 US Pat. No. 4,370,357, is described in particular in European Patent EP 0 744 222. However, it has the drawback of consuming a lot more energy than that of US Pat. No. 4,370,357. , 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 heating means by induction or electric resistance have been installed in the furnace chamber 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 put in place in a heating chamber to heat both the coating and the coating. 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 believe that they are electrical (and therefore non-catalytic), since their implementation in the enclosure requires the absence of oxygen in the enclosure. 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 : 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 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 method for drying and / or firing a protective and / or decorative organic coating on a continuously moving metal strip, comprising: 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 drying and / or baking of the coating, the solvents being continuously extracted from the furnace enclosure, and 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 the 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 a convection heating at medium 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, 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 :As catalytic gas radiants usable according to the present invention, there may be mentioned those described in European Patent EP 0 754 911. These are infrared radiation emitters with catalytic burner comprising:
- un caisson, une structure catalytique constituée d'un élément imprégné d'une matière catalytique de combustion,a housing, a catalytic structure consisting of an element impregnated with a catalytic combustion material,
- un organe d'injection d'un gaz combustible situé dans le caisson et débouchant à la surface de l'élément imprégné,an injection device for a combustible gas located in the box and opening on the surface of the impregnated element,
- un générateur d'air à turbine envoyant de l'air sous pression dans le caisson sur toute la surface de l'élément imprégné, eta turbine air generator sending pressurized air into the box over the entire surface of the impregnated element, and
- des moyens de chauffage électrique de l'élément imprégné .- Electric heating means of 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 :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:
- un four tunnel comportant une enceinte avec des parois internes chaudes, ladite enceinte étant équipée :a tunnel oven comprising an enclosure with hot internal walls, said enclosure being equipped with:
" de moyens de chauffage par induction électromagnétique de la bande qui traverse le four, et"electromagnetic induction heating means of the band that passes through the furnace, and
" de moyens de chauffage des parois de l'enceinte, et"means for heating the walls of the enclosure, and
- 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. 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.means for moving the strip provided with its organic coating from an inlet located at one end of the furnace enclosure to an outlet located at the other end of said enclosure. 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 Bl ou encore des thermoréacteurs de la société SUNKISS, comme indiqué ci- dessus . 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, emitters such as those described in European Patent EP 0 754 911 B1 or thermoreactors from SUNKISS, as indicated above, are advantageously used in the device according to the invention as infrared radiation emitters. 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 :Other advantageous features of the invention will appear in the following description of some embodiments given by way of a simple example and shown in the accompanying drawings:
- 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.- The figure is a schematic sectional diagram of a first example of a cooking and / or drying device according to the invention, - Figure 2 is a schematic sectional diagram of a second example of a cooking device and or drying 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 shown in FIG. 1 comprises - a kiln 1, preferably vertical and forming a tunnel, which is crossed by a steel strip 2 on which has previously been deposited an organic coating such as varnish or paint , and means 3 (for example baffle rollers) for moving the strip 2 of an inlet E located at a first end of the chamber 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 :The oven 1 comprises an enclosure 11 with hot internal walls (not shown in FIGS. 1 and 2), which is equipped with:
" d'une pluralité d'inducteurs 4 répartis le long de l'enceinte 11, etof a plurality of inductors 4 distributed along the enclosure 11, and
" 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.of 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. 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. 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' évaporâtion des solvants . The recovery chamber 6 is disposed between two inductors 4 in the middle third of the chamber 11 of the furnace 1. The drying and / or cooking device 1 shown in FIG. 2 differs from that represented in FIG. 1 by the position of FIG. the recovery chamber 6, which is in the upper third of the enclosure 11. In addition, Figure 2 also shows a possible example of distribution of the power 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) in order to facilitate the heating of the coating by conduction from the strip 2 and to 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 band 2 on the evaporation of solvents.

Claims

REVENDICATIONS
1. Procédé de séchage et/ou de cuisson d'un revêtement organique protecteur et/ou décoratif sur une bande métallique en défilement continu, comprenant : i) le chauffage par induction électromagnétique de ladite bande (2) dans un four tunnel (1) comportant une enceinte (11) avec des parois internes (12) chaudes, pour évaporer les solvants contenus dans la composition du revêtement organique et assurer le séchage et/ou la cuisson du revêtement, les solvants étant extraits en continu de l'enceinte (11) du four (1), et ii) le chauffage de l'enceinte (11) pour maintenir lesdites parois internes (12) à une température égale ou supérieure au point de rosée des solvants, caractérisé en ce que le chauffage de ladite bandeA method of drying and / or baking a protective and / or decorative organic coating on a continuously moving metal strip, comprising: i) electromagnetically inducing heating said strip (2) in a tunnel furnace (1) comprising an enclosure (11) with internal walls (12) hot, to evaporate the solvents contained in the composition of the organic coating and ensure the drying and / or cooking of the coating, the solvents being continuously extracted from the enclosure (11) ) of the furnace (1), and ii) the heating of the enclosure (11) to maintain said inner walls (12) at a temperature equal to or greater than the dew point of the solvents, characterized in that heating said strip
(2) par induction électromagnétique est couplé, de manière simultanée et complémentaire, à un chauffage par rayonnement infrarouge et un chauffage par convection au moyen d'un gaz de combustion, et en ce que le chauffage ii) de l'enceinte (11) du four (1) est réalisé par convection au moyen du même gaz de combustion que celui utilisé pour le chauffage par convection de ladite bande (2) .(2) by electromagnetic induction is coupled, simultaneously and complementary, to infrared radiation heating and convection heating by means of a combustion gas, and in that the heating ii) of the enclosure (11) of the furnace (1) is made by convection by means of the same combustion gas as that used for the convection heating of said strip (2).
2. Procédé selon la revendication 1, caractérisé en ce que le chauffage par rayonnement infrarouge est réalisé à l'aide d'au moins un émetteur de rayonnements infrarouges à brûleur catalytique (5) disposé dans l'enceinte (11) du four (1), ledit émetteur (5) 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 (12) de l'enceinte (11) et de la bande (2) est assuré par l'oxydation du gaz de combustion qui est injecté à la surface de l'élément catalytique dudit émetteur de rayonnements infrarouges (5) .2. Method according to claim 1, characterized in that the infrared radiation heating is carried out using at least one infrared radiation emitter with catalytic burner (5) disposed in the chamber (11) of the oven (1). ), said emitter (5) comprising a catalytic structure composed of a catalytic element impregnated with a catalytic material of combustion 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 (12) of the enclosure (11) and the strip (2) is ensured by the oxidation of the combustion gas which is injected on the surface of the catalytic element of said infrared radiation emitter (5).
3. Procédé selon la revendication 2, caractérisé en ce que le rayonnement infrarouge a une longueur d' onde comprise entre 3 et 10 μm.3. Method according to claim 2, characterized in that the infrared radiation has a wavelength of between 3 and 10 microns.
4. Procédé selon la revendication 2 ou 3, caractérisé en ce que les solvants évaporés lors du chauffage de la bande d'acier (2) sont partiellement oxydés sur la structure catalytique des émetteurs de rayonnements infrarouges à brûleur catalytique (5) .4. Method according to claim 2 or 3, characterized in that the solvents evaporated during heating of the steel strip (2) are partially oxidized on the catalytic structure of infrared radiation emitters catalytic burner (5).
5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la répartition des différents modes de chauffage de la bande5. Method according to any one of the preceding claims, characterized in that the distribution of the different heating modes of the strip
(2) évolue dans l'enceinte (11) du four (1) selon le sens de défilement (8) de la bande (2) dans ladite enceinte(2) evolves in the enclosure (11) of the furnace (1) in the direction of travel (8) of the strip (2) in said enclosure
(11), l'apport de chaleur par induction étant majoritaire à l'entrée (E) de l'enceinte (11) du four (1) et l'apport de chaleur par rayonnement et par convection étant majoritaire à la sortie (S) de l'enceinte (11) du four(11), induction heat being predominant at the inlet (E) of the enclosure (11) of the furnace (1) and the radiative and convective heat input being predominant at the outlet (S ) of the enclosure (11) of the oven
(1), avec une diminution progressive de l'apport de chaleur par induction concomitamment avec une augmentation progressive de l'apport de chaleur par convection et par rayonnement entre l'entrée (E) et la sortie (S) de l'enceinte (11) selon le sens de défilement (8) de la bande (2) .(1), with a gradual decrease in induction heat supply concomitantly with a gradual increase in convective and radiative heat input between the inlet (E) and the output (S) of the enclosure (11) in the direction of travel (8) of the strip (2).
6. Dispositif de cuisson et/ou séchage d'un revêtement organique protecteur et/ou décoratif préalablement déposé sur une bande métallique, comprenant :6. Device for cooking and / or drying a protective and / or decorative organic coating previously deposited on a metal strip, comprising:
- un four tunnel (1) comportant une enceinte (11) avec des parois internes chaudes (12), ladite enceinte (11) étant équipée :a tunnel furnace (1) comprising an enclosure (11) with hot internal walls (12), said enclosure (11) being equipped with:
" de moyens de chauffage par induction électromagnétique (4) de la bande (2) qui traverse le four (1) , et"electromagnetic induction heating means (4) of the strip (2) passing through the oven (1), and
" de moyens de chauffage (5) des parois de l'enceinte, et"means for heating (5) the walls of the enclosure, and
- des moyens (3) pour déplacer la bande (2) munie de son revêtement organique (21) 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), ledit dispositif étant caractérisé en ce que les moyens de chauffage (5) des parois (12) de l'enceintemeans (3) for moving the strip (2) provided with its organic coating (21) from an inlet (E) located at a first end of the enclosure (11) of the oven (1) to an outlet (S) ) located at the other end of said enclosure (11), said device being characterized in that the heating means (5) of the walls (12) of the enclosure
(11) 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 (2) munie de son revêtement, et en ce que ledit dispositif comporte en outre des moyens de chauffage par rayonnement infrarouge (5) de ladite bande (2) munie de son revêtement.(11) comprise means for convection heating with the aid of a combustion gas, which also constitute heating means for the band (2) provided with its coating, and in that said device further comprises means infrared radiation heating device (5) of said strip (2) provided with its coating.
7. Dispositif selon la revendication 6, caractérisé en ce que les moyens de chauffage par rayonnement infrarouge et les moyens de chauffage par convection (5) 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.7. Device according to claim 6, characterized in that the heating means by infrared radiation and the convection heating means (5) 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.
8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que les moyens de chauffage par induction (4) comprennent une pluralité d'inducteurs répartis le long de l'enceinte (11) entre l'entrée (E) du four (1) et la sortie (S) dans le sens de défilement (8) de la bande (2) .8. Device according to claim 6 or 7, characterized in that the induction heating means (4) comprise a plurality of inductors distributed along the enclosure (11) between the inlet (E) of the oven (1). ) and the output (S) in the direction of travel (8) of the strip (2).
9. Dispositif selon l'une quelconque des revendications 6 à 8, caractérisé en ce que les moyens de chauffage par infrarouge (5) comprennent une pluralité d'émetteurs de rayonnements infrarouges à brûleur catalytique répartis le long de l'enceinte (11) dans le sens de défilement et disposés de part et d'autre de la bande (2) .9. Device according to any one of claims 6 to 8, characterized in that the infrared heating means (5) comprise a plurality of infrared radiation radiators catalytic burner distributed along the enclosure (11) in the direction of scrolling and arranged on both sides of the strip (2).
10. Dispositif selon la revendication 8 ou 9, caractérisé en ce que les inducteurs (4) et les émetteurs infrarouges (5) sont répartis alternativement le long de 1' enceinte.10. Device according to claim 8 or 9, characterized in that the inductors (4) and the infrared emitters (5) are distributed alternately along the enclosure.
11. Dispositif selon la revendication 10, caractérisé en ce qu' il comporte un système de contrôle pour régler le nombre et l'emplacement des inducteurs (4) en service ainsi que leur alimentation électrique, ainsi que le nombre et l'emplacement des émetteurs à infrarouge (5) en service ainsi que leur alimentation en gaz combustible ou en mélange air/gaz combustible. 11. Device according to claim 10, characterized in that it comprises a control system for adjusting the number and location of the inductors (4) in use and their power supply, and the number and location of the infrared emitters (5) in service and their supply of fuel gas or air / fuel 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 Not-in-force EP2281163B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR2008/000650 WO2009136010A1 (en) 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

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EP2281163A1 true EP2281163A1 (en) 2011-02-09
EP2281163B1 EP2281163B1 (en) 2015-12-02

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US (1) US9789514B2 (en)
EP (1) EP2281163B1 (en)
CN (1) CN102016472B (en)
BR (1) BRPI0822662B1 (en)
WO (1) WO2009136010A1 (en)

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US20150013177A1 (en) * 2013-07-15 2015-01-15 Finishing Brands Holdings Inc. Curing System and Method
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Publication number Publication date
BRPI0822662B1 (en) 2020-12-08
BRPI0822662A2 (en) 2015-06-30
US20110059266A1 (en) 2011-03-10
US9789514B2 (en) 2017-10-17
CN102016472A (en) 2011-04-13
WO2009136010A1 (en) 2009-11-12
EP2281163B1 (en) 2015-12-02
CN102016472B (en) 2013-07-24

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