EP2558804A1 - Method and device for coating metal strips - Google Patents
Method and device for coating metal stripsInfo
- Publication number
- EP2558804A1 EP2558804A1 EP11722889A EP11722889A EP2558804A1 EP 2558804 A1 EP2558804 A1 EP 2558804A1 EP 11722889 A EP11722889 A EP 11722889A EP 11722889 A EP11722889 A EP 11722889A EP 2558804 A1 EP2558804 A1 EP 2558804A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- strip
- gas
- coating
- cooler
- outlet
- 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
Links
Classifications
-
- 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
- F26B13/005—Seals, locks, e.g. gas barriers for web drying enclosures
Definitions
- the present invention relates to heating furnaces by inducing bands in continuous scrolling.
- pre-treatment or post-treatment coating drying ovens on the continuous treatment lines of metal strips, in particular galvanizing lines or annealing lines.
- the invention is particularly applicable to drying and polymerization furnaces of the pre-lacquering lines of metal strips.
- Continuous pre-lacing of metal strips involves applying a thin layer of liquid paint to the strip at the parade and drying the paint in an oven.
- the coated strip is then cooled, generally with water by spraying or by immersion in a water tray.
- the paints used usually contain organic solvents. Evaporated in the oven, they are sucked up and destroyed by incineration at high temperature.
- the heating of the strip can be carried out in different ways. Most often it is done by convection with hot air impact.
- the proposed invention makes it possible to eliminate these disadvantages.
- a device for coating a metal strip in continuous displacement successively comprises, in the running direction of the strip, a coating section for depositing a coating on the strip, a heating section, for evaporating elements including solvents and drying or baking the coating and a cooler, and is characterized in that:
- an atmosphere separating device is placed between the outlet of the heating section and the inlet of the cooler.
- the device for separating atmospheres comprises means for injecting a gas at a temperature above the dew point of the elements to be evaporated.
- the cooler is a water cooler.
- the device for separating atmospheres may comprise members making it possible to limit the passage section and therefore the gas flows.
- the device for separating atmospheres may comprise an injection of hot gas placed, in the running direction of the strip, upstream of the members making it possible to limit the passage section, and a gas withdrawal placed downstream.
- the furnace may comprise a vertical pass in which the band travels from bottom to top, in that a deflector roll is placed at the end of the vertical pass for returning the band to the cooling section, and in that a main injection of hot gas is located at the entrance of the furnace and a hot gas withdrawal is located at the return box.
- the invention also relates to a method for coating a continuously moving metal strip according to which said strip, after having received its coating, is heated in a heating section in order to evaporate elements, in particular solvents, and to ensure drying or drying. baking the coating, then cooled, which process is characterized in that:
- Sheet metal continuity is ensured between the inlet of the furnace and the outlet of the water cooler to make the gas-tight assembly, an apparatus for separating atmospheres, by injecting a gas at a temperature above the dew point elements, is placed between the outlet of the heating section and the inlet of the water cooler.
- an injection of a gas at a temperature above the dew point of the elements is carried out at the inlet of the furnace.
- a main gas withdrawal is carried out at the outlet of the heating section.
- An auxiliary gas withdrawal can be carried out downstream of the atmospheric separation device, in the running direction of the strip.
- the auxiliary gas withdrawal is advantageously carried out upstream of the cooler, in the running direction of the strip, which is preferably cooled with water.
- the cooling of the strip is provided by a water spraying.
- the continuity of the sheet metal allows a rollover of the band from its entry into the heating section to the outlet of the cooler.
- the diffuse emanations escaping from the band after its exit from the last inductor can thus be captured and incinerated.
- the patent FR2734501 describes a solution comprising the implantation of several withdrawal and reinjection points in the cooking zone.
- the presence of the cowling according to the invention makes it possible to simplify the withdrawal and reinjection circuits.
- the method according to the invention leads, for example, to reinject a hot gas at a single point, located at the entrance of the baking tunnel, and to withdraw at another point, just before cooling water.
- the method according to the invention comprises an atmosphere separation device placed between the outlet of the heating section and the inlet of the water cooler.
- the device for separating atmospheres according to the invention comprises members making it possible to limit the passage section and therefore the gas flows.
- the device may for example be a roller lock, comprising at least one pair of rollers placed on either side of the band.
- the device may also consist of one or more support rollers on one face of the strip and flaps on the opposite face, placed opposite the rollers.
- the atmospheric separation device advantageously comprises an injection of a gas at a temperature above the dew point of the solvents.
- the method according to the invention also comprises a withdrawal of the humid air from the cooler. This can be placed just downstream of the atmospheric separation device, therefore upstream of the cooler, or at the outlet of the water cooler.
- the process according to the invention makes it possible to avoid diffuse fumes outside the oven. Thus all emanations are captured and incinerated. This results in a better cleanliness of the installation which makes it less dangerous by reducing the risk of spread of fire, the risk of slipping and less stale air.
- This configuration according to the invention allows the absence of condensation in the solvent circulation circuit and also outside this circuit.
- FIG. 1 represents an example of an induction furnace according to the invention
- FIG. 2 represents an enlargement of the atmosphere separation device 1 1 according to the embodiment of FIG. 1.
- the furnace comprises two successive inductors 1a and 1b mounted on a vertical pass in which the band 2 flows from bottom to top.
- a deflector roll 3 placed at the end of the vertical pass enables the band to be returned to the cooling section 4.
- the cooling section 4 comprises a first portion equipped with a plurality of water spray ramps 18a and 18b on the strip and a water tank 20 for collecting the water flowing from the upper part.
- a recovery 21 allows to supply the ramps 18a and 18b again via a closed circuit, not shown, comprising a plate heat exchanger.
- the strip is held in a closed envelope consisting of the successive internal walls of the inlet box 7, the inductor 1a, the connecting box 8, the inductor 1 b, the connecting box 9, the return box 10, the atmosphere separation device 1 1 and the water cooler 4 and the water tank 20.
- a main injection of hot gas 16 is located at the entrance of the furnace and a hot gas withdrawal 17 is located at the level of the return box 10.
- the hot gas injected at the injection points 16 and 14 is advantageously air preheated by the incineration fumes of the solvents. Its temperature at the injection points depends on the condensation temperature of the solvents. It is typically greater than 200 ° C.
- the device 1 1 for separating atmospheres comprises a support roller 12 on which the strip rests on its face 2a, and facing the opposite face, a retractable flap 13 limiting the passage section of the atmosphere. It also comprises an injection of hot gas 14 placed upstream of the roller assembly 12 and flap 13 in the running direction of the strip and a gas withdrawal 15 placed downstream.
- the roller 12 can be motorized and its rotational speed regulated so that the peripheral speed of the roller is identical to that of the tape.
- the roll 12 may be positioned slightly set back from the band pass line so that it does not rest on the roll in normal operation but only punctually, for example in the case of a change in tension of band during transient phases.
- An insulator 22 limits the free section for the flow of gases.
- a functional clearance between the roller 12 and the insulator allows rotation of the roller while limiting the flow of gas between the upstream and downstream of the roller 12.
- the flap 13 is retractable to allow the introduction of the strip into the oven.
- the roller 12 makes it possible to control the position of the strip and thus to minimize the opening X between the end of the flap 13 and the strip.
- a functional clearance between the flap 13 and the insulator allows the flap to rotate while limiting the flow of gas between the upstream and downstream flap 13.
- the device 1 1 for separating atmospheres comprises two successive sets of roll 12 and flap 13.
- This configuration makes it possible to increase the tightness of the device by increasing the pressure drop of the device. gas in motion. Upstream of the roller assembly 12 and flap 13 in the running direction of the strip, the combination of the two hot gas injections 14 and 16 and the withdrawal 17 makes it possible to maintain the internal walls of the heating section from the inlet 5 to the roller assembly 12 and 13 at a sufficient temperature to avoid the condensation of solvents. It also ensures the evacuation of solvents to the incinerator.
- the outlet 6 of the water cooler 4 is in the open air. Downstream of the roller assembly 12 and flap 13 in the running direction of the strip, the combination of the draw-off point 15 and the air inlet via the outlet 6 of the cooler makes it possible to ensure the evacuation of the solvents residuals from the coating of the belt to the incinerator.
- the strand of tape between the deflector roll 3 and the outlet of the water cooler is horizontal.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Coating Apparatus (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11722889T PL2558804T3 (en) | 2010-04-13 | 2011-04-12 | Method and device for coating metal strips |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1001546A FR2958563A3 (en) | 2010-04-13 | 2010-04-13 | METHOD AND DEVICE FOR COATING METAL BANDS |
FR1054382A FR2958564B1 (en) | 2010-04-13 | 2010-06-04 | METHOD AND DEVICE FOR COATING METAL BANDS |
PCT/IB2011/051557 WO2011128834A1 (en) | 2010-04-13 | 2011-04-12 | Method and device for coating metal strips |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2558804A1 true EP2558804A1 (en) | 2013-02-20 |
EP2558804B1 EP2558804B1 (en) | 2015-06-24 |
Family
ID=43067195
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11722889.0A Active EP2558804B1 (en) | 2010-04-13 | 2011-04-12 | Method and device for coating metal strips |
Country Status (7)
Country | Link |
---|---|
US (1) | US9109833B2 (en) |
EP (1) | EP2558804B1 (en) |
BE (1) | BE1019081A5 (en) |
ES (1) | ES2546491T3 (en) |
FR (2) | FR2958563A3 (en) |
PL (1) | PL2558804T3 (en) |
WO (1) | WO2011128834A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2746662B1 (en) | 2012-10-18 | 2019-04-24 | Fives Stein Bilbao, S.A. | Method and unit for applying a protective or decorative coating to a metal band |
FR3014447B1 (en) * | 2013-12-05 | 2016-02-05 | Fives Stein | METHOD AND INSTALLATION FOR CONTINUOUS THERMAL TREATMENT OF A STEEL BAND |
FR3064278B1 (en) * | 2017-03-22 | 2021-04-23 | Fives Stein | CONTINUOUS LINE COOLING SECTION AND METHOD COMBINING DRY COOLING AND WET COOLING |
EP4282541A1 (en) * | 2022-05-23 | 2023-11-29 | John Cockerill S.A. | Method and facility for applying a liquid coating on a continuously scrolling and downward-moving strip |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2469270A (en) * | 1945-08-21 | 1949-05-03 | Robert A Liebel | Apparatus for setting finishing compositions |
US2570906A (en) * | 1946-07-31 | 1951-10-09 | Alferieff Michel | Process for coating metallic objects with other metals |
US3510960A (en) * | 1967-06-10 | 1970-05-12 | Hisayoshi Kubodera | Vertical drying machine |
US3559280A (en) * | 1968-03-13 | 1971-02-02 | Allied Tube & Conduit Corp | Method and apparatus for the continuous forming, galvanizing and coloring of tubing |
US4082868A (en) * | 1976-03-18 | 1978-04-04 | Armco Steel Corporation | Method for continuously contact-coating one side only of a ferrous base metal strip with a molten coating metal |
US4752217A (en) * | 1987-08-28 | 1988-06-21 | Essex Group, Inc. | Wire coating oven including wire cooling apparatus |
DE4226107A1 (en) * | 1992-08-07 | 1994-02-10 | Vits Maschinenbau Gmbh | Drying plant |
DE4236299C2 (en) | 1992-10-28 | 2003-03-06 | Emtec Magnetics Gmbh | Sealing device at the inlet and / or outlet of a floating dryer for webs |
US5919517A (en) * | 1993-05-05 | 1999-07-06 | Aluminum Company Of America | Method for coating a metal strip |
FR2734501B1 (en) | 1995-05-23 | 1997-07-04 | Stein Heurtey | METHOD AND DEVICE FOR COATING METAL STRIPS |
DE19633742A1 (en) * | 1996-08-22 | 1998-02-26 | Sundwiger Eisen Maschinen | Process and installation for applying a coating agent, in particular paint, to a strip of metal, in particular steel, in one pass |
DE10062618B4 (en) * | 2000-12-15 | 2004-04-29 | Systronic Systemlösungen für die Elektronikindustrie GmbH | Continuous dryer for panels or webs |
DE10148158A1 (en) * | 2001-09-28 | 2003-04-17 | Sms Demag Ag | Process for hot-dip coating with reverse strip travel |
-
2010
- 2010-04-13 FR FR1001546A patent/FR2958563A3/en active Pending
- 2010-06-04 FR FR1054382A patent/FR2958564B1/en not_active Expired - Fee Related
- 2010-11-10 BE BE2010/0662A patent/BE1019081A5/en not_active IP Right Cessation
-
2011
- 2011-04-12 ES ES11722889.0T patent/ES2546491T3/en active Active
- 2011-04-12 US US13/639,289 patent/US9109833B2/en not_active Expired - Fee Related
- 2011-04-12 EP EP11722889.0A patent/EP2558804B1/en active Active
- 2011-04-12 WO PCT/IB2011/051557 patent/WO2011128834A1/en active Application Filing
- 2011-04-12 PL PL11722889T patent/PL2558804T3/en unknown
Non-Patent Citations (1)
Title |
---|
See references of WO2011128834A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20130029055A1 (en) | 2013-01-31 |
FR2958564A1 (en) | 2011-10-14 |
EP2558804B1 (en) | 2015-06-24 |
US9109833B2 (en) | 2015-08-18 |
PL2558804T3 (en) | 2015-12-31 |
FR2958563A3 (en) | 2011-10-14 |
ES2546491T3 (en) | 2015-09-24 |
FR2958564B1 (en) | 2015-01-02 |
WO2011128834A1 (en) | 2011-10-20 |
BE1019081A5 (en) | 2012-02-07 |
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