EP0744222A1 - Process and apparatus for coating metal strips - Google Patents

Process and apparatus for coating metal strips Download PDF

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Publication number
EP0744222A1
EP0744222A1 EP96400929A EP96400929A EP0744222A1 EP 0744222 A1 EP0744222 A1 EP 0744222A1 EP 96400929 A EP96400929 A EP 96400929A EP 96400929 A EP96400929 A EP 96400929A EP 0744222 A1 EP0744222 A1 EP 0744222A1
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EP
European Patent Office
Prior art keywords
solvents
oven
gas
injected
tunnel
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Granted
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EP96400929A
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German (de)
French (fr)
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EP0744222B1 (en
Inventor
Didier Delaunay
Hugues Amaury Jean Vialla
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Fives Stein SA
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Stein Heurtey SA
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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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements
    • F26B23/02—Heating arrangements using combustion heating
    • F26B23/022—Heating arrangements using combustion heating incinerating volatiles in the dryer exhaust gases, the produced hot gases being wholly, partly or not recycled into the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/32—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action
    • F26B3/34—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects
    • F26B3/343—Drying solid materials or objects by processes involving the application of heat by development of heat within the materials or objects to be dried, e.g. by fermentation or other microbiological action by using electrical effects in combination with convection

Definitions

  • the present invention relates to a method and a device for depositing and drying a protective or decorative coating on a continuously moving metal strip.
  • paint This contains organic or aqueous solvents and, after the deposition of the paint layer on the strip, the assembly is heated in order to facilitate the evaporation of the solvents and to allow the paint to cook. For safety reasons, and in order to control polluting emissions, the solvents thus evaporated are continuously extracted in order to be possibly incinerated.
  • the heating of the strip provided with its paint coating can be carried out by various means, in particular by blowing hot air or infrared or electromagnetic induction heating systems.
  • Heating by electromagnetic induction has the advantage of heating the paint by the substrate (that is to say by the strip), the heat flow propagating towards the outside, which facilitates the evaporation of the solvents.
  • this heating mode has the characteristic of heating only the metal strip, the atmosphere and the walls of the oven remaining relatively cold. If this characteristic brings the advantage of limiting heat losses, it has in particular the disadvantage of causing a recondensation of the evaporated solvents on the coldest parts of the oven walls, the temperature of which is generally lower than the dew point of the solvents.
  • the water cooling circuits of the coils of the electromagnetic induction heating device also constitute preferred condensation points.
  • the resulting condensates are particularly troublesome when they fall on the coating freshly deposited on the strip, or on the rollers for applying the coating in contact with the latter. As a result, the coating is no longer uniform, which implies a defect in appearance and possibly protection.
  • the present invention has therefore set itself the objective of avoiding such recondensations of the solvents and the principle which it implements consists firstly in raising the temperature of the atmosphere of the furnace beyond the dew point of the solvents and on the other hand, to separate the atmosphere from the cold spots thanks to a particular design of the oven tunnel.
  • the present invention relates, firstly, to a method of protective or decorative coating of a continuously moving metal strip according to which said strip, after having received its coating, is heated by electromagnetic induction in a tunnel oven to evaporate the solvents and ensuring the baking of the coating, the solvents being continuously extracted from the enclosure of said oven, characterized in that a gas chosen is injected into the oven so that the internal walls of said oven are at a temperature above the point dew of solvents and making the oven gas-tight and thermally insulated to keep internal walls hot above this dew point.
  • the present invention secondly also relates to a device for implementing the method as defined above, consisting of a tunnel oven continuously traversed by the metal strip and comprising at least one inductor for heating the strip , this device being characterized in that the internal walls of said tunnel furnace are thermally insulated and gas tight, said walls being transparent to the electromagnetic field and non-electrically conductive and in that means are provided for injecting hot gas respectively at the inlet and outlet of the tunnel oven and at least one suction point for the atmosphere of the oven loaded with solvents.
  • the oven according to the present invention is in the form of a tunnel oven comprising an outer casing 4 and through which the metal strip 1, to be provided with a protective or decorative coating, moves continuously.
  • the tunnel oven comprises two sections of oven each provided with their inductor. This tunnel follows the oven pass line which can be vertical, horizontal (as illustrated in the figures) or oblique.
  • This furnace is heated by electromagnetic induction and the cooled turns of the inductors are shown diagrammatically at 5. This induction heating ensures, in known manner, on the one hand the cooking of the coating previously deposited on the strip 1 and on the other hand, the evaporation of the solvents contained in the coating material.
  • a gas is injected into the tunnel 2, at a temperature chosen so that the internal walls of the furnace are at a temperature above the dew point of the solvents.
  • This temperature will depend on the characteristics of the solvents used and it may possibly be higher than the final temperature of the strip. It will generally be greater than 100 ° C and, in the case of organic solvents, it will preferably be of the order of 150 ° C.
  • the invention also provides a device for regulating the temperature of the injected gas.
  • the gas thus injected will generally be air; however, one can choose a gas which has any composition.
  • Figure 1 there is shown at 7, the injection sheath of the preheated gas. In this figure, we see that the injection of gas takes place at the inlet and outlet of the oven.
  • the oven has a system for extracting the atmosphere from the oven loaded with solvents.
  • Figure 1 there is shown in 6 the suction sheath of this atmosphere.
  • the extraction of the atmosphere loaded with solvents can be carried out either at a single point or at several points.
  • the oven comprises several separate inductors, as illustrated in the nonlimiting embodiment shown in FIG. 1, the extraction is carried out, preferably between two inductors. Of course, the extraction rate must remain in accordance with safety standards.
  • the solvents thus extracted are used to preheat the gas injected according to the process specified above.
  • the method of the invention also provides for making the oven gas-tight and thermally insulated in order to keep the internal walls hot.
  • the oven is waterproof with respect to solvents, transparent to the magnetic field and it has good thermal insulation and good mechanical strength.
  • the system for assembling the tunnel 2 to the field coils 5 and the various tunnel elements between them is designed so as not to substantially modify these properties.
  • each sealed tunnel section 2 there is shown diagrammatically at 3 the thermal insulation which is provided according to the invention in each sealed tunnel section 2.
  • This thermal insulation can be produced according to any known, appropriate technique.
  • a paint is applied continuously applied to both sides of a strip of steel circulating horizontally.
  • the thickness of the strip varies from 0.3 to 2.5 mm and its width from 700 to 1500 mm. Its speed is between 30 and 150 m per minute and the metal flow can reach 60 tonnes per hour.
  • the oven composed of three inductors, has a total length of around 11 m.
  • the present invention is not limited to the exemplary embodiments and implementation, nor to the exemplary embodiment, described and mentioned above, but that it encompasses all variants thereof.
  • the pass line of the strip can be either vertical, oblique or horizontal.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Biotechnology (AREA)
  • Molecular Biology (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Sustainable Development (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)
  • Coating With Molten Metal (AREA)

Abstract

After depositing a protective or decorative coating on a metallic tape (1), the tape is continuously passed through an induction furnace tunnel (2) having an external casing (4) The tunnel furnace has two sections each provided with cooled induction coils (5). The induction heating bakes the previously deposited coating on the tape and evaporates the solvents contained in the coating material. The solvents are continuously extracted from the furnace. Gas, generally air, is injected into the tunnel at a temperature greater than the dew point of the solvents. Thermal insulation (3) in each section of the sealed tunnel maintains the hot internal walls above the dew point.

Description

La présente invention concerne un procédé et un dispositif de dépôt et de séchage d'un revêtement protecteur ou décoratif sur une bande métallique se déplaçant de façon continue.The present invention relates to a method and a device for depositing and drying a protective or decorative coating on a continuously moving metal strip.

La technique de dépôt et de séchage d'un tel revêtement est couramment utilisée sur des bandes métalliques, sur lesquelles le revêtement, contenant des composants pouvant être métalliques, organiques ou aqueux, est généralement déposé sous forme liquide.The technique of depositing and drying such a coating is commonly used on metal strips, on which the coating, containing components which may be metallic, organic or aqueous, is generally deposited in liquid form.

Parmi les nombreux exemples relatifs à cette technique, on citera en particulier l'application de peinture. Celle-ci contient des solvants organiques ou aqueux et, après le dépôt de la couche de peinture sur la bande, l'ensemble est chauffé afin de faciliter l'évaporation des solvants et de permettre la cuisson de la peinture. Pour des raisons de sécurité, et afin de maîtriser les émissions polluantes, les solvants ainsi évaporés sont extraits en continu afin d'être éventuellement incinérés. Le chauffage de la bande pourvue de son revêtement de peinture peut être effectué par divers moyens notamment par soufflage d'air chaud ou des systèmes de chauffage à infrarouge ou à induction électromagnétique.Among the many examples relating to this technique, particular mention will be made of the application of paint. This contains organic or aqueous solvents and, after the deposition of the paint layer on the strip, the assembly is heated in order to facilitate the evaporation of the solvents and to allow the paint to cook. For safety reasons, and in order to control polluting emissions, the solvents thus evaporated are continuously extracted in order to be possibly incinerated. The heating of the strip provided with its paint coating can be carried out by various means, in particular by blowing hot air or infrared or electromagnetic induction heating systems.

Le chauffage par induction électromagnétique présente l'avantage de chauffer la peinture par le substrat (c'est-à-dire par la bande), le flux thermique se propageant vers l'extérieur, ce qui facilite l'évaporation des solvants. En revanche, ce mode de chauffage présente la caractéristique de ne chauffer que la bande métallique, l'atmosphère et les parois du four restant relativement froides. Si cette caractéristique apporte l'avantage de limiter les pertes thermiques, elle présente notamment l'inconvénient de provoquer une recondensation des solvants évaporés sur les parties les plus froides des parois du four, dont la température est en général inférieure au point de rosée des solvants.Heating by electromagnetic induction has the advantage of heating the paint by the substrate (that is to say by the strip), the heat flow propagating towards the outside, which facilitates the evaporation of the solvents. On the other hand, this heating mode has the characteristic of heating only the metal strip, the atmosphere and the walls of the oven remaining relatively cold. If this characteristic brings the advantage of limiting heat losses, it has in particular the disadvantage of causing a recondensation of the evaporated solvents on the coldest parts of the oven walls, the temperature of which is generally lower than the dew point of the solvents.

En outre, les circuits de refroidissement d'eau des bobines du dispositif de chauffage par induction électromagnétique constituent également des points de condensation privilégiés. Les condensats résultant sont particulièrement génants lorsqu'ils retombent sur le revêtement fraîchement déposé sur la bande, ou sur les rouleaux d'application du revêtement en contact avec celle-ci. Il en résulte que le revêtement n'est plus uniforme, ce qui implique un défaut d'aspect et éventuellement de protection.In addition, the water cooling circuits of the coils of the electromagnetic induction heating device also constitute preferred condensation points. The resulting condensates are particularly troublesome when they fall on the coating freshly deposited on the strip, or on the rollers for applying the coating in contact with the latter. As a result, the coating is no longer uniform, which implies a defect in appearance and possibly protection.

Pour pallier ces inconvénients, on a envisagé diverses solutions notamment celle consistant à limiter la recondensation des solvants, par exemple en réalisant une augmentation du débit d'air dans le four. Cependant, l'expérience démontre que les solutions ainsi envisagées s'avèrent peu efficaces et souvent incompatibles avec un fonctionnement économique de l'installation.To overcome these drawbacks, various solutions have been envisaged, in particular that of limiting the recondensation of the solvents, for example by increasing the air flow in the oven. However, experience shows that the solutions thus considered prove to be ineffective and often incompatible with an economic operation of the installation.

La présente invention s'est donc fixé pour objectif d'éviter de telles recondensations des solvants et le principe qu'elle met en oeuvre consiste d'une part à élever la température de l'atmosphère du four au-delà du point de rosée des solvants et d'autre part, à séparer l'atmosphère des points froids grâce à une conception particulière du tunnel du four.The present invention has therefore set itself the objective of avoiding such recondensations of the solvents and the principle which it implements consists firstly in raising the temperature of the atmosphere of the furnace beyond the dew point of the solvents and on the other hand, to separate the atmosphere from the cold spots thanks to a particular design of the oven tunnel.

En conséquence, la présente invention concerne, en premier lieu, un procédé de revêtement protecteur ou décoratif d'une bande métallique en déplacement continu selon lequel ladite bande, après avoir reçu son revêtement, est chauffée par induction électromagnétique dans un four tunnel pour évaporer les solvants et assurer la cuisson du revêtement, les solvants étant extraits en continu de l'enceinte dudit four, caractérisé en ce que l'on injecte dans le four un gaz choisi de façon que les parois internes dudit four soient à une température supérieure au point de rosée des solvants et en ce que l'on rend le four étanche aux gaz et isolé thermiquement pour conserver des parois internes chaudes au dessus de ce point de rosée.Consequently, the present invention relates, firstly, to a method of protective or decorative coating of a continuously moving metal strip according to which said strip, after having received its coating, is heated by electromagnetic induction in a tunnel oven to evaporate the solvents and ensuring the baking of the coating, the solvents being continuously extracted from the enclosure of said oven, characterized in that a gas chosen is injected into the oven so that the internal walls of said oven are at a temperature above the point dew of solvents and making the oven gas-tight and thermally insulated to keep internal walls hot above this dew point.

La présente invention, en second lieu vise également un dispositif pour la mise en oeuvre du procédé tel que défini ci-dessus, constitué d'un four tunnel traversé en continu par la bande métallique et comprenant au moins un inducteur pour le chauffage de la bande, ce dispositif étant caractérisé en ce que les parois internes dudit four tunnel sont isolées thermiquement et étanches aux gaz, lesdites parois étant transparentes au champ électro-magnétique et non conductrices électriques et en ce qu'on prévoit des moyens d'injection de gaz chaud respectivement à l'entrée et à la sortie du four tunnel et au moins un point d'aspiration de l'atmosphère du four chargée en solvants.The present invention, secondly also relates to a device for implementing the method as defined above, consisting of a tunnel oven continuously traversed by the metal strip and comprising at least one inductor for heating the strip , this device being characterized in that the internal walls of said tunnel furnace are thermally insulated and gas tight, said walls being transparent to the electromagnetic field and non-electrically conductive and in that means are provided for injecting hot gas respectively at the inlet and outlet of the tunnel oven and at least one suction point for the atmosphere of the oven loaded with solvents.

D'autres caractéristiques et avantages de la présente invention ressortiront de la description faite ci-après en référence au dessin annexé qui en illustre un exemple de réalisation dépourvu de tout caractère limitatif. Sur le dessin :

  • La figure 1 est une vue schématique représentant un four selon l'invention en coupe axiale longitudinale et,
  • La figure 2 est une vue à échelle agrandie représentant une partie du four illustrée par la figure 1.
Other characteristics and advantages of the present invention will emerge from the description given below with reference to the appended drawing which illustrates an embodiment thereof devoid of any limiting character. On the drawing :
  • FIG. 1 is a schematic view showing an oven according to the invention in longitudinal axial section and,
  • FIG. 2 is an enlarged view showing part of the oven illustrated in FIG. 1.

En se référant aux figures, on voit que le four selon la présente invention se présente sous la forme d'un four tunnel comportant une enveloppe extérieure 4 et au travers duquel la bande métallique 1, devant être munie d'un revêtement protecteur ou décoratif, se déplace en continu. Dans l'exemple illustré par la figure 1 et qui n'a aucun caractère limitatif, le four tunnel comporte deux sections de four munies chacune de leur inducteur. Ce tunnel suit la ligne de passe du four qui peut être verticale, horizontale (comme illustré sur les figures) ou oblique. Ce four est chauffé par induction électromagnétique et l'on a représenté schématiquement en 5 les spires refroidies des inducteurs. Ce chauffage par induction assure, de façon connue, d'une part la cuisson du revêtement préalablement déposé sur la bande 1 et d'autre part, l'évaporation des solvants contenus dans le matériau de revêtement.Referring to the figures, it can be seen that the oven according to the present invention is in the form of a tunnel oven comprising an outer casing 4 and through which the metal strip 1, to be provided with a protective or decorative coating, moves continuously. In the example illustrated by FIG. 1 and which has no limiting character, the tunnel oven comprises two sections of oven each provided with their inductor. This tunnel follows the oven pass line which can be vertical, horizontal (as illustrated in the figures) or oblique. This furnace is heated by electromagnetic induction and the cooled turns of the inductors are shown diagrammatically at 5. This induction heating ensures, in known manner, on the one hand the cooking of the coating previously deposited on the strip 1 and on the other hand, the evaporation of the solvents contained in the coating material.

Selon la présente invention, on injecte un gaz dans le tunnel 2, à une température choisie de manière que les parois internes du four soient à une température supérieure au point de rosée des solvants. Cette température dépendra des caractéristiques des solvants utilisés et elle peut éventuellement être supérieure à la température finale de la bande. Elle sera généralement supérieure à 100°C et, dans le cas de solvants organiques, elle sera de préférence de l'ordre de 150°C. Pour assurer un bon fonctionnement de l'installation, l'invention prévoit d'ailleurs un dispositif de régulation de la température du gaz injecté. Le gaz ainsi injecté sera généralement de l'air ; cependant on peut choisir un gaz qui présente une composition quelconque. Sur la figure 1, on a représenté en 7, la gaine d'injection du gaz préchauffé. Sur cette figure, on voit que l'injection du gaz s'effectue à l'entrée et à la sortie du four.According to the present invention, a gas is injected into the tunnel 2, at a temperature chosen so that the internal walls of the furnace are at a temperature above the dew point of the solvents. This temperature will depend on the characteristics of the solvents used and it may possibly be higher than the final temperature of the strip. It will generally be greater than 100 ° C and, in the case of organic solvents, it will preferably be of the order of 150 ° C. To ensure proper operation of the installation, the invention also provides a device for regulating the temperature of the injected gas. The gas thus injected will generally be air; however, one can choose a gas which has any composition. In Figure 1, there is shown at 7, the injection sheath of the preheated gas. In this figure, we see that the injection of gas takes place at the inlet and outlet of the oven.

Le four comporte un système d'aspiration de l'atmosphère du four chargée en solvants. Sur la figure 1, on a représenté en 6 la gaine d'aspiration de cette atmosphère. L'extraction de l'atmosphère chargée en solvants peut s'effectuer soit en un point unique, soit en plusieurs points. Lorsque le four comprend plusieurs inducteurs séparés, comme illustré dans le mode de réalisation non limitatif représenté sur la figure 1, l'extraction est menée, de préférence entre deux inducteurs. Bien entendu, le débit d'extraction doit rester conforme aux normes de sécurité.The oven has a system for extracting the atmosphere from the oven loaded with solvents. In Figure 1, there is shown in 6 the suction sheath of this atmosphere. The extraction of the atmosphere loaded with solvents can be carried out either at a single point or at several points. When the oven comprises several separate inductors, as illustrated in the nonlimiting embodiment shown in FIG. 1, the extraction is carried out, preferably between two inductors. Of course, the extraction rate must remain in accordance with safety standards.

Selon l'invention, et dans la mesure où l'on prévoit des moyens d'incinération des solvants, les solvants ainsi extraits sont utilisés pour préchauffer le gaz injecté selon le procédé spécifié ci-dessus.According to the invention, and to the extent that means for incinerating the solvents are provided, the solvents thus extracted are used to preheat the gas injected according to the process specified above.

Le procédé de l'invention prévoit également de rendre le four étanche aux gaz et isolé thermiquement afin de conserver des parois internes chaudes. Ainsi, le four est étanche vis à vis des solvants, transparent au champ magnétique et il présente une bonne isolation thermique et une bonne tenue mécanique. Le système d'assemblage du tunnel 2 aux bobines inductrices 5 et des différents éléments de tunnel entre eux est conçu de façon à ne pas modifier sensiblement ces propriétés.The method of the invention also provides for making the oven gas-tight and thermally insulated in order to keep the internal walls hot. Thus, the oven is waterproof with respect to solvents, transparent to the magnetic field and it has good thermal insulation and good mechanical strength. The system for assembling the tunnel 2 to the field coils 5 and the various tunnel elements between them is designed so as not to substantially modify these properties.

Sur les figures on a schématisé en 3 l'isolant thermique qui est prévu selon l'invention dans chaque section de tunnel étanche 2. Cet isolant thermique peut être réalisé selon toute technique connue, appropriée.In the figures there is shown diagrammatically at 3 the thermal insulation which is provided according to the invention in each sealed tunnel section 2. This thermal insulation can be produced according to any known, appropriate technique.

En dehors de la suppression des recondensations des solvants, qui permet ainsi qu'on l'a mentionné ci-dessus de maintenir la qualité du produit revêtu, l'invention apporte d'autres avantages parmi lesquels on peut citer notamment :

  • une amélioration du rendement thermique du four lorsque le gaz chaud injecté dans le four est préchauffé par un incinérateur, ceci en raison de la réduction des pertes par les parois de l'inducteur;
  • une amélioration de la propreté du four, ce qui diminue la fréquence des opérations de maintenance liées au nettoyage du four.
Apart from the elimination of solvent recondensations, which makes it possible, as mentioned above, to maintain the quality of the coated product, the invention provides other advantages among which we can cite in particular:
  • an improvement in the thermal efficiency of the oven when the hot gas injected into the oven is preheated by an incinerator, this due to the reduction of losses through the walls of the inductor;
  • an improvement in the cleanliness of the oven, which reduces the frequency of maintenance operations related to cleaning the oven.

On décrira maintenant un exemple d'application de l'invention, étant entendu que cet exemple ne présente aucun caractère limitatif.An example of application of the invention will now be described, it being understood that this example has no limiting character.

Dans cette application industrielle, on cuit une peinture appliquée en continu sur les deux faces d'une bande d'acier circulant horizontalement. L'épaisseur de la bande varie de 0,3 à 2,5 mm et sa largeur de 700 à 1500 mm. Sa vitesse est comprise entre 30 et 150 m par minute et le débitde métal peut atteindre 60 tonnes par heure.In this industrial application, a paint is applied continuously applied to both sides of a strip of steel circulating horizontally. The thickness of the strip varies from 0.3 to 2.5 mm and its width from 700 to 1500 mm. Its speed is between 30 and 150 m per minute and the metal flow can reach 60 tonnes per hour.

Dans un cas de dimensionnement particulier, une bande de 0,8 mm d'épaisseur et 1 250 mm de largeur, circulant à la vitesse de 80 m par minute, est chauffée jusqu'à environ 240°C. Le four, composé de trois inducteurs, a une longueur totale d'environ 11 m.In a particular design case, a strip 0.8 mm thick and 1250 mm wide, circulating at a speed of 80 m per minute, is heated to around 240 ° C. The oven, composed of three inductors, has a total length of around 11 m.

Les conditions de mise en oeuvre du procédé de l'invention sont les suivantes :

  • on injecte de l'air chaud à l'entrée et à la sortie du four. Cet air, produit par l'incinérateur, est dilué par de l'air frais et injecté à la température voisine de 150°C ;
  • on extrait l'air chargé en solvants en un point unique, situé entre le premier et le deuxième inducteur. Le débit maximal est de 25 000 m3 par heure pour 300 litres de solvants déposés par heure ;
  • le tunnel étanche est composé de trois sections, séparées par deux gaines en aluminium, ou autre matériau amagnétique, chaque section correspondant à un inducteur. Les fixations tunnel/gaine sont assurées de façon étanche à l'aide de brides.
The conditions for implementing the process of the invention are as follows:
  • hot air is injected at the inlet and outlet of the oven. This air, produced by the incinerator, is diluted with fresh air and injected at a temperature close to 150 ° C;
  • the air loaded with solvents is extracted at a single point, located between the first and the second inductor. The maximum flow rate is 25,000 m 3 per hour for 300 liters of solvents deposited per hour;
  • the sealed tunnel is made up of three sections, separated by two sheaths of aluminum or other non-magnetic material, each section corresponding to an inductor. The tunnel / duct fasteners are tightly sealed with flanges.

Il demeure bien entendu que la présente invention n'est pas limitée aux exemples de réalisation et de mise en oeuvre, ni à l'exemple de réalisation, décrits et mentionnés ci-dessus mais qu'elle en englobe toutes les variantes. En particulier, on notera que la ligne de passe de la bande peut être indiféremment verticale, oblique ou horizontale.It remains to be understood that the present invention is not limited to the exemplary embodiments and implementation, nor to the exemplary embodiment, described and mentioned above, but that it encompasses all variants thereof. In particular, it will be noted that the pass line of the strip can be either vertical, oblique or horizontal.

Claims (13)

Procédé de revêtement protecteur ou décoratif d'une bande métallique en déplacement continu selon lequel ladite bande, après avoir reçu son revêtement, est chauffée par induction électromagnétique dans un four tunnel pour évaporer les solvants et assurer la cuisson du revêtement, les solvants étant extraits en continu de l'enceinte dudit four, caractérisé en ce que l'on injecte dans le four un gaz à une température supérieure au point de rosée des solvants et en ce que l' on rend le four étanche aux gaz et isolé thermiquement pour conserver des parois internes chaudes, au dessus de ce point de rosée.Process for the protective or decorative coating of a continuously moving metal strip, according to which said strip, after having received its coating, is heated by electromagnetic induction in a tunnel oven to evaporate the solvents and ensure the baking of the coating, the solvents being extracted in continuous of the enclosure of said oven, characterized in that a gas is injected into the oven at a temperature above the dew point of the solvents and in that the oven is made gas-tight and thermally insulated to preserve warm internal walls, above this dew point. Procédé selon la revendication 1, caractérisé en ce que le gaz est injecté à une température qui dépend des caractéristiques des solvants utilisés.Method according to claim 1, characterized in that the gas is injected at a temperature which depends on the characteristics of the solvents used. Procédé selon l'une des revendications 1 ou 2 caractérisé en ce que le gaz est injecté à une température supérieure à 100°C.Method according to one of claims 1 or 2 characterized in that the gas is injected at a temperature above 100 ° C. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que, dans le cas de solvants organiques, la température d'injection du gaz est de l'ordre de 150°C.Method according to any one of the preceding claims, characterized in that, in the case of organic solvents, the gas injection temperature is of the order of 150 ° C. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le gaz est de l'air chaud.Method according to any one of the preceding claims, characterized in that the gas is hot air. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que le gaz injecté est préalablement réchauffé dans un incinérateur des solvants.Method according to any one of the preceding claims, characterized in that the injected gas is previously reheated in a solvent incinerator. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que les solvants sont extraits en un point unique.Method according to any one of the preceding claims, characterized in that the solvents are extracted at a single point. Procédé selon l'une quelconque des revendications 1 à 6 caractérisé en ce que les solvants sont extraits en plusieurs points.Process according to any one of Claims 1 to 6, characterized in that the solvents are extracted at several points. Dispositif pour la mise en oeuvre de procédé selon l'une quelconque des revendications précédentes, constitué d'un four tunnel (2) traversé en continu par la bande métallique (1) et comprenant au moins un inducteur (5) pour le chauffage de la bande caractérisé en ce que les parois internes dudit four tunnel (2) sont isolées thermiquement (3) et étanches aux gaz, lesdites parois étant transparentes au champ électro-magnétique et non conductrices électriques et en ce qu'on prévoit des moyens d'injection (7) de gaz chaud respectivement à l'entrée et à la sortie du four tunnel et au moins un point d'aspiration (6) de l'atmosphère du four chargée en solvants.Device for carrying out the method according to any one of the preceding claims, consisting of a tunnel oven (2) continuously traversed by the metal strip (1) and comprising at least one inductor (5) for heating the strip characterized in that the internal walls of said tunnel oven (2) are thermally insulated (3) and gas tight, said walls being transparent to the electromagnetic field and non-electrically conductive and in that injection means are provided (7) of hot gas respectively at the inlet and at the outlet of the tunnel oven and at least one suction point (6) of the atmosphere of the oven loaded with solvents. Dispositif selon la revendication 9 caractérisé en ce que, dans le cas où le four tunnel comporte plusieurs inducteurs séparés (5), l'aspiration des solvants s'effectue entre deux inducteurs.Device according to Claim 9, characterized in that, in the case where the tunnel oven comprises several separate inductors (5), the suction of the solvents takes place between two inductors. Dispositif selon l'une des revendications 9 ou 10 caractérisé en ce qu'il comporte un incinérateur alimenté à partir de l'aspiration (6) des solvants du four pour assurer le réchauffage du gaz injecté dans le four.Device according to one of claims 9 or 10 characterized in that it comprises an incinerator supplied from the suction (6) of the solvents from the oven to ensure the heating of the gas injected into the oven. Dispositif selon l'une quelconque des revendications 9 à 11 caractérisé en ce qu'il comporte un système de régulation de la température du gaz chaud injecté dans le four.Device according to any one of Claims 9 to 11, characterized in that it includes a system for regulating the temperature of the hot gas injected into the oven. Dispositif selon l'une quelconque des revendications 9 à 12 caractérisé en ce que la ligne de passe de la bande est indiféremment verticale, oblique ou horizontale.Device according to any one of Claims 9 to 12, characterized in that the pass line of the strip is either vertical, oblique or horizontal.
EP96400929A 1995-05-23 1996-04-30 Process for coating metal strips Revoked EP0744222B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9506141A FR2734501B1 (en) 1995-05-23 1995-05-23 METHOD AND DEVICE FOR COATING METAL STRIPS
FR9506141 1995-05-23

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EP0744222A1 true EP0744222A1 (en) 1996-11-27
EP0744222B1 EP0744222B1 (en) 2001-03-14

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US (1) US5768799A (en)
EP (1) EP0744222B1 (en)
AT (1) ATE199664T1 (en)
DE (2) DE69612031T2 (en)
FR (1) FR2734501B1 (en)

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WO1998000240A1 (en) * 1996-06-29 1998-01-08 Ema Elektro-Maschinen-Schultze Gmbh & Co. Kg Device and process for coating a workpiece
DE10130342C1 (en) * 2001-06-20 2003-02-06 Inductotherm Coating Equipment Method and device for drying and / or baking a coating applied to a metallic strip
WO2012163334A1 (en) * 2011-05-27 2012-12-06 Thermprotec Gmbh Method and assembly for producing a coated metal strip
CN101767083B (en) * 2009-12-25 2013-04-17 蚌埠国威滤清器有限公司 Filter surface powder curing equipment
US9789514B2 (en) 2008-05-08 2017-10-17 Primetals Technologies France SAS 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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US6393044B1 (en) * 1999-11-12 2002-05-21 Inductotherm Corp. High efficiency induction melting system
JP2002287317A (en) * 2001-03-28 2002-10-03 Fuji Photo Film Co Ltd Drying equipment
FR2832940A1 (en) * 2001-12-04 2003-06-06 Stein Heurtey Drying coated metal strip by induction heating in a tunnel furnace with independent control of the temperature of the induction coils to maintain them at a higher temperature than the extracted solvents
FR2846261B1 (en) * 2002-10-25 2005-01-21 Myriad METHOD FOR DRYING A METAL TAPE COATING
AU2003900491A0 (en) * 2003-02-04 2003-02-20 Bhp Steel Limited Method of curing a substrate
FR2857734B1 (en) * 2003-07-16 2005-09-02 Stein Heurtey METHOD AND DEVICE FOR DRYING A NON-METALLIC COATING ON A STEEL STRIP
US20090057301A1 (en) 2007-08-28 2009-03-05 Jean Lovens Electric induction heating apparatus with fluid medium flow through
DE102008015658A1 (en) 2008-03-25 2009-11-12 Gesellschaft für aero- und thermodynamische Verfahrenstechnik mbH Apparatus and method for heating metal strips
FR2958563A3 (en) 2010-04-13 2011-10-14 Fives Stein METHOD AND DEVICE FOR COATING METAL BANDS
US20130115384A1 (en) * 2011-11-04 2013-05-09 Armando Sáenz-CHAPA Continuous method for applying a cover over a metallic sheet
WO2014060613A1 (en) 2012-10-18 2014-04-24 Fives Stein Bilbao, S.A. Method and unit for applying a protective or decorative coating to a metal band
EP3928879A1 (en) 2016-12-27 2021-12-29 SABIC Global Technologies B.V. Drying a coating using electromagnetic radiation or heating of drum
EP3590693B1 (en) * 2018-07-02 2021-06-16 Zortrax Spolka Akcyjna A desktop device and a method for post-processing of a plastic product
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EP4271129A1 (en) * 2022-04-29 2023-11-01 SMS Elotherm GmbH Device for inductively heating at least one workpiece and method for inductively heating at least one workpiece

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WO1998000240A1 (en) * 1996-06-29 1998-01-08 Ema Elektro-Maschinen-Schultze Gmbh & Co. Kg Device and process for coating a workpiece
DE10130342C1 (en) * 2001-06-20 2003-02-06 Inductotherm Coating Equipment Method and device for drying and / or baking a coating applied to a metallic strip
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US9789514B2 (en) 2008-05-08 2017-10-17 Primetals Technologies France SAS Method of drying and/or curing an organic coating on a continuously running metal strip, and device for implementing this method
CN101767083B (en) * 2009-12-25 2013-04-17 蚌埠国威滤清器有限公司 Filter surface powder curing equipment
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Also Published As

Publication number Publication date
DE69612031T2 (en) 2001-11-15
ATE199664T1 (en) 2001-03-15
DE744222T1 (en) 1997-04-30
DE69612031D1 (en) 2001-04-19
US5768799A (en) 1998-06-23
EP0744222B1 (en) 2001-03-14
FR2734501B1 (en) 1997-07-04
FR2734501A1 (en) 1996-11-29

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