EP0744222B1 - Procédé de revêtement de bandes métalliques - Google Patents
Procédé de revêtement de bandes métalliques Download PDFInfo
- Publication number
- EP0744222B1 EP0744222B1 EP96400929A EP96400929A EP0744222B1 EP 0744222 B1 EP0744222 B1 EP 0744222B1 EP 96400929 A EP96400929 A EP 96400929A EP 96400929 A EP96400929 A EP 96400929A EP 0744222 B1 EP0744222 B1 EP 0744222B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solvents
- gas
- coating
- tunnel
- oven
- 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.)
- Revoked
Links
Images
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
- 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 deposition and drying process a protective or decorative coating on a metal strip moving from continuously.
- the technique of depositing and drying such a coating is commonly used on metal strips, on which the coating, containing components which can be metallic, organic or aqueous, is generally deposited in liquid form.
- paint This contains organic or aqueous solvents and, after depositing the layer of paint on the strip, the assembly is heated in order to facilitate the evaporation of solvents and allow the paint to cook. For safety reasons, and in order to control polluting emissions, 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 heating systems to infrared or electromagnetic induction.
- Electromagnetic induction heating has the advantage of heating the painting by the substrate (i.e. by the strip), the heat flux propagating outwards, which facilitates the evaporation of solvents.
- this mode of heating has the characteristic of heating only the metal strip, the atmosphere and the walls of the oven remain relatively cold. If this feature has the advantage of limiting heat loss, it has in particular the drawback of causing a recondensation of the evaporated solvents on the coldest parts of the oven walls, the temperature of which is general below the dew point of solvents.
- the water cooling circuits of the coils of the device electromagnetic induction heating also constitute points preferred condensation.
- the resulting condensates are particularly annoying when they fall on the coating freshly deposited on the tape, or on the application rolls of the coating in contact with it. As a result, the coating is no longer uniform, which implies a defect in appearance and possibly protection.
- US-A-4 370 357 describes a method of coating a metal strip in continuous movement according to which the strip, provided with its coating is heated by electromagnetic induction in a tunnel oven to ensure baking of the coating and evaporation of the solvents which are extracted in continuous from the oven enclosure.
- document US-A-4 370 357 describes a protective or decorative coating process for a metal strip continuous displacement according to which said strip, after having received its coating, is heated by electromagnetic induction in a tunnel oven to evaporate solvents and ensure the coating is cooked, the solvents being continuously extracted the enclosure of said oven according to which a gas is injected into the oven and according to which we return the oven gas tight and thermally insulated to keep internal walls hot, above this dew point.
- the present invention has therefore set itself the objective of avoiding such recondensations solvents and the principle which it implements consists on the one hand in raising the oven atmosphere temperature above the dew point of the solvents and on the other hand, to separate the atmosphere from the cold spots thanks to a design particular of the oven tunnel.
- the present invention relates 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 cooking the coating, the solvents being continuously extracted from the enclosure of said oven, and according to which a gas is injected into the oven at a temperature above the point of dew of solvents and making the oven gas tight and insulated thermally to keep warm inner walls above this point dew.
- the oven is present in the form of a tunnel oven comprising an outer casing 4 and at through which the metal strip 1, to be provided with a protective coating or decorative, moves continuously.
- the tunnel oven has two sections of oven provided each of their inductor. This tunnel follows the oven pass line which can be vertical, horizontal (as illustrated in the figures) or oblique.
- This oven is heated by electromagnetic induction and there is shown schematically in 5 the cooled coils of inductors. This induction heating ensures, so known, firstly the baking 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 tunnel 2, at a temperature chosen so that the internal walls of the oven are at a temperature greater than the dew point of solvents.
- This temperature will depend on characteristics of the solvents used and it may possibly be greater than the final temperature of the strip. It will generally be higher than 100 ° C and, in the case of organic solvents, it will preferably be of the order of 150 ° C.
- the invention also provides for a device for regulating the temperature of the injected gas.
- the gas thus injected will be usually air; however, one can choose a gas which has a any composition.
- Figure 1 there is shown in 7, the injection sheath preheated gas. In this figure, we see that the gas injection takes place at the inlet and out of the oven.
- the oven has a system for extracting the atmosphere from the oven loaded with solvents.
- Figure 1 there is shown at 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 contains several separate inductors, as illustrated in the nonlimiting embodiment shown in Figure 1, the extraction is carried out, preferably between two inductors. Of course, the extraction rate must remain in accordance with the standards of security.
- the solvents thus extracted are used to preheat the injected gas according to the process specified above.
- the method of the invention also provides for making the oven gas-tight and thermally insulated to keep internal walls warm. So the oven is impervious to solvents, transparent to the magnetic field and has a good thermal insulation and good mechanical strength.
- the system of assembly of the tunnel 2 to the field coils 5 and of the various elements of tunnel between them is designed so as not to significantly 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 insulator can be carried out according to any known, appropriate technique.
- a paint is applied continuously on the two sides of a steel strip running 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 understood 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 approximately 11 m.
- the present invention is not limited to the examples of realization and implementation, nor in the example of realization, described and mentioned above but that it encompasses all variants.
- the web pass line can be either vertical, oblique or horizontal.
Landscapes
- 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)
- Coating With Molten Metal (AREA)
- Furnace Details (AREA)
Description
- La figure 1 est une vue schématique représentant un four en coupe axiale longitudinale et,
- La figure 2 est une vue à échelle agrandie représentant une partie du four illustrée par la figure 1.
- 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.
- 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.
Claims (8)
- 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, et selon lequel on injecte dans le four un gaz à une température supérieure au point de rosée des solvants et selon lequel on rend le four étanche aux gaz et isolé thermiquement pour conserver des parois internes chaudes, au dessus de ce point de rosée.
- Procédé selon la revendication 1, caractérisé en ce que le gaz est injecté à une température qui dépend des caractéristiques des solvants utilisés.
- Procédé selon l'une des revendications 1 ou 2 caractérisé en ce que le gaz est injecté à une température supérieure à 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.
- Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le gaz est de l'air chaud.
- Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que le gaz injecté est préalablement réchauffé dans un incinérateur des solvants.
- Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que les solvants sont extraits en un point unique.
- Procédé selon l'une quelconque des revendications 1 à 6 caractérisé en ce que les solvants sont extraits en plusieurs points.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9506141A FR2734501B1 (fr) | 1995-05-23 | 1995-05-23 | Procede et dispositif de revetement de bandes metalliques |
| FR9506141 | 1995-05-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0744222A1 EP0744222A1 (fr) | 1996-11-27 |
| EP0744222B1 true EP0744222B1 (fr) | 2001-03-14 |
Family
ID=9479301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96400929A Revoked EP0744222B1 (fr) | 1995-05-23 | 1996-04-30 | Procédé de revêtement de bandes métalliques |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5768799A (fr) |
| EP (1) | EP0744222B1 (fr) |
| AT (1) | ATE199664T1 (fr) |
| DE (2) | DE744222T1 (fr) |
| FR (1) | FR2734501B1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2105212A1 (fr) | 2008-03-25 | 2009-09-30 | Gesellschaft für aero- und thermodynamische Verfahrenstechnik mbH | Dispositif et procédé destinés au chauffage de bandes de métal |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19626209A1 (de) * | 1996-06-29 | 1998-01-08 | Ema Elektro Maschinen Schultze | Vorrichtung und Verfahren zum Beschichten eines Werkstücks |
| US6393044B1 (en) * | 1999-11-12 | 2002-05-21 | Inductotherm Corp. | High efficiency induction melting system |
| JP2002287317A (ja) * | 2001-03-28 | 2002-10-03 | Fuji Photo Film Co Ltd | 乾燥装置 |
| DE10130342C1 (de) * | 2001-06-20 | 2003-02-06 | Inductotherm Coating Equipment | Verfahren und Vorrichtung zum Trocknen und/oder Einbrennen einer auf ein metallisches Band aufgebrachten Beschichtung |
| FR2832940A1 (fr) * | 2001-12-04 | 2003-06-06 | Stein Heurtey | Procede de sechage de revetement de bandes metalliques par chauffage par induction |
| FR2846261B1 (fr) * | 2002-10-25 | 2005-01-21 | Myriad | Procede de sechage d'un revetement de bande metallique |
| AU2003900491A0 (en) * | 2003-02-04 | 2003-02-20 | Bhp Steel Limited | Method of curing a substrate |
| FR2857734B1 (fr) * | 2003-07-16 | 2005-09-02 | Stein Heurtey | Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier |
| US20090057301A1 (en) | 2007-08-28 | 2009-03-05 | Jean Lovens | Electric induction heating apparatus with fluid medium flow through |
| 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 (zh) * | 2009-12-25 | 2013-04-17 | 蚌埠国威滤清器有限公司 | 滤清器表面粉末固化设备 |
| FR2958563A3 (fr) | 2010-04-13 | 2011-10-14 | Fives Stein | Procede et dispositif de revetement de bandes metalliques. |
| DE102011102608A1 (de) * | 2011-05-27 | 2012-11-29 | ThermProTEC Asia UG (haftungsbeschränkt) | Verfahren und Vorrichtung zur Lösemittelrückgewinnung bei der Metallbandbeschichtung |
| US20130115384A1 (en) | 2011-11-04 | 2013-05-09 | Armando Sáenz-CHAPA | Continuous method for applying a cover over a metallic sheet |
| WO2014060613A1 (fr) | 2012-10-18 | 2014-04-24 | Fives Stein Bilbao, S.A. | Procédé et installation de revêtement protecteur ou décoratif d'une bande métallique |
| EP3928879A1 (fr) | 2016-12-27 | 2021-12-29 | SABIC Global Technologies B.V. | Séchage de revêtement par rayonnement électromagnétique ou chauffage de tambour |
| PL3590686T3 (pl) * | 2018-07-02 | 2021-11-08 | Zortrax Spółka Akcyjna | Urządzenie i sposób wygładzania powierzchni wyrobu z tworzywa sztucznego parami rozpuszczalnika |
| ES2882284T3 (es) * | 2018-07-02 | 2021-12-01 | Zortrax Spolka Akcyjna | Un dispositivo de escritorio y un método para postprocesamiento de un producto plástico |
| PL3590687T3 (pl) * | 2018-07-02 | 2021-11-15 | Zortrax Spółka Akcyjna | Urządzenie modułowe i sposób wygładzania powierzchni wyrobu z tworzywa sztucznego |
| EP4271129A1 (fr) * | 2022-04-29 | 2023-11-01 | SMS Elotherm GmbH | Dispositif de chauffage par induction d'au moins une pièce, ainsi que procédé de chauffage par induction d'au moins une pièce |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2213452C3 (de) * | 1972-04-06 | 1975-11-27 | Wsesojusny Nautschno-Issledowatelskij Institut Po Stroitelstwu Magistralnych Truboprowodow, Moskau | Verfahren und Vorrichtung zum Trocknen von Emailschlicker an der Innenflache von Rohren |
| US4370357A (en) * | 1981-03-11 | 1983-01-25 | Cleveland Gear Company | Process of continuous metal coating |
| CA1309755C (fr) * | 1987-03-30 | 1992-11-03 | Hiroyoshi Nozaki | Methode de cuisson de couche de protection |
| GB9103962D0 (en) * | 1991-02-26 | 1991-04-10 | Cmb Foodcan Plc | An oven |
| DE4208781C1 (en) * | 1992-03-17 | 1992-12-10 | Mannesmann Ag, 4000 Duesseldorf, De | Drying system for metal pipe before surface treatment e.g. polymer coating - which heats with inductive loops with a warmed airstream passing through spiral loops |
| US5357687A (en) * | 1993-07-23 | 1994-10-25 | Xerox Corporation | Method and apparatus for drying/curing rigid cylindrical and flexible belt substrates |
-
1995
- 1995-05-23 FR FR9506141A patent/FR2734501B1/fr not_active Expired - Fee Related
-
1996
- 1996-04-30 DE DE0744222T patent/DE744222T1/de active Pending
- 1996-04-30 AT AT96400929T patent/ATE199664T1/de active
- 1996-04-30 DE DE69612031T patent/DE69612031T2/de not_active Revoked
- 1996-04-30 EP EP96400929A patent/EP0744222B1/fr not_active Revoked
- 1996-05-06 US US08/646,222 patent/US5768799A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2105212A1 (fr) | 2008-03-25 | 2009-09-30 | Gesellschaft für aero- und thermodynamische Verfahrenstechnik mbH | Dispositif et procédé destinés au chauffage de bandes de métal |
| DE102008015658A1 (de) | 2008-03-25 | 2009-11-12 | Gesellschaft für aero- und thermodynamische Verfahrenstechnik mbH | Vorrichtung und Verfahren zur Erwärmung von Metallbändern |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2734501B1 (fr) | 1997-07-04 |
| DE744222T1 (de) | 1997-04-30 |
| ATE199664T1 (de) | 2001-03-15 |
| US5768799A (en) | 1998-06-23 |
| EP0744222A1 (fr) | 1996-11-27 |
| FR2734501A1 (fr) | 1996-11-29 |
| DE69612031D1 (de) | 2001-04-19 |
| DE69612031T2 (de) | 2001-11-15 |
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