• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A method and a device for coating a continuously moving metal strip according to which said strip, after receiving its coating, is heated in a heating section to evaporate in particular solvents and ensure the drying or cooking of the coating, then is cooled to water, a sheet metal continuity is provided between the entrance of the tunnel furnace and the outlet of the water cooler to make the assembly gas-tight, and a device for separating atmospheres, by injecting a gas into a gas temperature higher than the beating point of the solvents, is placed between the exit of the tunnel furnace and the inlet of the water cooler.
    公开号:BE1019081A5
    申请号:E2010/0662
    申请日:2010-11-10
    公开日:2012-02-07
    发明作者:Didier Delaunay；George Jean-Pierre Lipp
    申请人:Fives Stein；
    IPC主号:
    专利说明:

    METHOD AND DEVICE FOR COATING METAL BANDS
    The present invention relates to heating furnaces by inducing bands in continuous scrolling.
    It is applicable, for example, to 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.
    In the remainder of this document, the case of pre-lacquering lines with protective or decorative coatings using paints with organic solvents will be dealt with more particularly.
    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.
    After baking, 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.
    However, other heating modes are used, in particular heating by electromagnetic induction. In this case the temperature of the sucked gases remains low and this results in condensations of solvents and resins in the furnace and in the incineration circuit.
    The patent FR2734501 has proposed a method for limiting these condensations, of reinjecting hot air into the heating section and thermally isolating the latter. This hot air is injected and withdrawn between the inductors, in particular to limit the chimney effect caused when the tunnel is in vertical configuration.
    However this design induces two constraints:
    There remains the problem of diffuse emanations of solvent products escaping from the web between the moment when it leaves the heating section and enters the water cooling section. These diffuse emanations pollute the immediate environment of the installation by filling the floors, railings, etc. with slippery residues and make the air difficult to breathe and toxic. In addition, these residues are a potential fuel in case of fire.
    In practice, the limitation of the chimney effect in the case of a vertical heating section requires creating a back pressure by adjusting the different rates of reinjection and withdrawal along the heating section. This adjustment is tricky to implement and may require additional control of the Lower Explosive Limit in the different sections of the section. This can lead to an increase in the rate of withdrawal, and therefore the fuel consumption of the incinerator.
    The proposed invention makes it possible to eliminate these disadvantages.
    According to the invention, 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: a sheet metal continuity is provided between the inlet of the heating section and the outlet of the cooler to make the gas-tight assembly, an atmosphere separation device is placed between the outlet of the heating section and the inlet of the cooler.
    Advantageously, the device for separating atmospheres comprises means for injecting a gas at a temperature above the dew point of the elements to be evaporated. Preferably, the cooler is a water cooler.
    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: a continuity of sheet metal is provided between the inlet of the oven and the outlet of the water cooler to make the gas-tight assembly, a separation device of atmospheres, by injecting a gas at a temperature above the dew point of the elements, is placed between the outlet of the heating section and the inlet of the water cooler,
    Advantageously, an injection of a gas at a temperature above the dew point of the elements is carried out at the inlet of the furnace. Generally, a main gas withdrawal is carried out at the outlet of the heating section. An auxiliary gas withdrawal can be carried out. to be performed downstream of the atmospheric separation device, in the running direction of the strip.
    The auxiliary gas withdrawal is advantageously carried out downstream of the cooler, in the running direction of the strip, which is preferably cooled with water.
    In the preferred embodiment of the invention, cooling of the strip is ensured by 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.
    To avoid condensations of solvents, it is necessary to maintain the internal surface of the cowling beyond the non-condensing temperature in I thermally insulating and sweeping this assembly by hot atmosphere, which will incinerate.
    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.
    To avoid increasing the total withdrawal flow rate, that from the heating section and the one from the cooler, it will seek to limit the inflow of air, that is to say the air flow coming from from the outside of the oven and not loaded with solvents.
    To do this you can use a water cooling tank in immersion mode to create a hydraulic seal to have a perfect seal.
    However, this solution is not satisfactory, in particular because it imposes a vertical configuration of the water tank, more constraining in terms of implantation and more expensive. Moreover, the immersion does not allow not to wet one of the two faces of the strip, which may be required for the hot application of certain films. In addition, this configuration promotes the pollution of cooling water by diffuse fumes.
    It is therefore preferred to use a conventional cooling type sprinkler by adding a ventilation system aeraulic before the water tank, type roller lock. This separation makes it possible to drive the majority of vapors to the incineration circuit, and not to the cooling circuit.
    Thus, to limit the air inlets from the cooler and not loaded with solvents, the method according to the invention comprises a separation device r '. f atmosphere 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.
    It 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 according to the invention 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 spreading 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.
    It also allows better control of the withdrawal rate. Ambient air at ambient temperature only comes from the inlet of the heating section. This makes it possible to better control the flow rate and the dilution of the solvents withdrawn. This results in a minimization of the fuel consumption of the incinerator and a better safety of the installation. Previous problems of balancing the flow rates in the different branches of the induction tunnel, in particular to limit the chimney effect, are thus simplified.
    The invention consists, apart from the arrangements set out above, in a number of other arrangements which will be more explicitly discussed below with respect to an embodiment described with reference to the accompanying drawings, but which is in no way limiting. On these drawings:
    Fig. 1 represents an example of an induction furnace according to the invention, and
    Fig. 2 shows an enlargement of the atmosphere separation device 11 according to the embodiment of FIG. 1.
    As shown in FIG. 1, in this embodiment, 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 allows 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.
    From the inlet 5 of the oven to its outlet 6, 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 1b, connecting box 9, the return box 10, the atmosphere separation device 11 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
    As shown in FIG. 2, in this exemplary embodiment, the device 11 for separating atmospheres comprises a support roll 12 on which the strip is placed on its face 2a, and facing the opposite face, a retractable flap 13 limiting the cross-section. passage 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.
    To limit the risk of marking the tape, 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. Alternatively, 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.
    According to another embodiment not shown, the device 11 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 gas moving.
    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.
    According to another embodiment not shown, the strand of tape between the deflector roll 3 and the outlet of the water cooler is horizontal.
    权利要求:
    Claims (13)
    [1]
    1. Device for coating a metal strip in continuous displacement successively comprising, 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 curing of the coating and a cooler, characterized in that: - continuity of sheet metal is ensured between the inlet (5) of the heating section and the outlet (6) of the cooler to make the l gas-tight assembly, an atmosphere separating device (11) is placed between the outlet of the heating section and the inlet of the cooler.
    [2]
    2. Device according to claim 1, characterized in that the atmosphere separating device (11) comprises means (14) for injecting a gas at a temperature above the dew point of the elements to be evaporated.
    [3]
    3. Device according to claim 1 or 2, characterized in that the cooler is a water cooler.
    [4]
    4. Device according to any one of the preceding claims, characterized in that the atmospheric separation device comprises members (12,13) for limiting the passage section and therefore the gas flows.
    [5]
    5. Device according to claim 4, characterized in that the device (11) for separating atmospheres comprises an injection of hot gas (14) placed, in the running direction of the strip, upstream of the separating device. atmospheres, and a gas withdrawal (15) downstream.
    [6]
    6. Device according to any one of the preceding claims, characterized in that the oven comprises a vertical passage in which the strip (2) flows from bottom to top, in that a deflector roll (3) is placed at the end of the vertical passage for returning the strip to the cooling section (4), and in that 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 return box (10).
    [7]
    7. A method of coating a metal strip in continuous displacement wherein said strip, after receiving its coating, is heated in a heating section to evaporate elements including solvents and ensure the drying or baking of the coating, then cooled, characterized in that: - continuity of sheet metal is provided between the inlet (5) of the furnace and the outlet (6) of the water cooler to make the gas-tight assembly, - an atmospheric separation device (11), by injecting a gas at a temperature above the dew point of the elements, is placed between the outlet of the heating section and the inlet of the water cooler,
    [8]
    8. Method according to claim 7, characterized in that an injection (16) of a gas at a temperature above the dew point of the elements, is carried out at the inlet (5) of the oven,
    [9]
    9. Method according to claim 7 or 8, characterized in that a main gas withdrawal (17) is carried out at the outlet of the heating section,
    [10]
    10. Process according to any one of claims 7 to 9, characterized in that the strip is cooled with water.
    [11]
    11. A method according to any one of claims 7 to 10, characterized in that one re-injects a hot gas at a single point, located at the entrance of the cooking tunnel, and is withdrawn at another point, just before water cooling
    [12]
    Process according to any one of Claims 7 to 11, characterized in that an auxiliary gas withdrawal (15) is carried out downstream of the atmospheric separation device, in the running direction of the strip.
    [13]
    13. The method of claim 12 characterized in that the auxiliary gas withdrawal (15) is carried out upstream of the water cooler (4) in the running direction of the strip.
    类似技术:
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB1234956A|1967-06-10|1971-06-09|Hisayoshi Kubodera|Vertical drying machine|
    US4752217A|1987-08-28|1988-06-21|Essex Group, Inc.|Wire coating oven including wire cooling apparatus|
    DE4226107A1|1992-08-07|1994-02-10|Vits Maschinenbau Gmbh|Drying plant|
    DE19633742A1|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|
    DE10062618A1|2000-12-15|2002-07-11|Systronic Systemloesungen Fuer|Straight-through air dryer for circuit boards or conduction paths, has blower unit for blowing part-air-flow in transport direction|
    US2469270A|1945-08-21|1949-05-03|Robert A Liebel|Apparatus for setting finishing compositions|
    US2570906A|1946-07-31|1951-10-09|Alferieff Michel|Process for coating metallic objects with other metals|
    US3559280A|1968-03-13|1971-02-02|Allied Tube & Conduit Corp|Method and apparatus for the continuous forming, galvanizing and coloring of tubing|
    US4082868A|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|
    DE4236299C2|1992-10-28|2003-03-06|Emtec Magnetics Gmbh|Sealing device at the inlet and / or outlet of a floating dryer for webs|
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    DE10148158A1|2001-09-28|2003-04-17|Sms Demag Ag|Process for hot-dip coating with reverse strip travel|ES2733719T3|2012-10-18|2019-12-02|Fives Stein Bilbao S A|Process and installation to apply a protective or decorative coating to a metal band|
    FR3014447B1|2013-12-05|2016-02-05|Fives Stein|METHOD AND INSTALLATION FOR CONTINUOUS THERMAL TREATMENT OF A STEEL BAND|
    FR3064278B1|2017-03-22|2021-04-23|Fives Stein|CONTINUOUS LINE COOLING SECTION AND METHOD COMBINING DRY COOLING AND WET COOLING|
    法律状态:
    2019-08-19| MM| Lapsed because of non-payment of the annual fee|Effective date: 20181130 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1001546|2010-04-13|
    FR1001546A|FR2958563A3|2010-04-13|2010-04-13|METHOD AND DEVICE FOR COATING METAL BANDS|
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