EP1644680A2 - Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier. - Google Patents
Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier.Info
- Publication number
- EP1644680A2 EP1644680A2 EP04767544A EP04767544A EP1644680A2 EP 1644680 A2 EP1644680 A2 EP 1644680A2 EP 04767544 A EP04767544 A EP 04767544A EP 04767544 A EP04767544 A EP 04767544A EP 1644680 A2 EP1644680 A2 EP 1644680A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- oven
- air
- hot air
- strip
- dynamic
- 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
- F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
- F26B21/50—Ducting arrangements from the source of air or other gases to the materials or objects being dried
-
- 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
- B05D3/04—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 exposure to gases
- B05D3/0406—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 exposure to gases the gas being air
- B05D3/0413—Heating with air
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B13/00—Machines and apparatus for drying fabrics, fibres, yarns, or other materials in long lengths, with progressive movement
- F26B13/10—Arrangements for feeding, heating or supporting materials; Controlling movement, tension or position of materials
-
- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
-
- 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
Definitions
- the invention relates to a method for drying a non-metallic coating on a steel strip, according to which the strip is passed through in a steel oven.
- the invention relates to a method for drying a non-metallic coating on a steel strip. vertical drying with relatively cold walls, hot air is injected at the bottom and at the top of the oven to avoid condensation of vapors on the walls of the oven, and the injected air is drawn off.
- the invention relates more particularly to a method of drying a coating consisting of a layer of paint.
- the non-metallic coatings of steel strips are produced with production facilities or lines generally comprising a section for preparing the surface of the strip, followed by a section for applying a liquid coating film, in particular by coating. by rollers, then a drying section of this film.
- Drying is obtained by bringing the support and the film to a required temperature allowing the coating to dry and to cure. During drying, the solvents in the coating are removed by evaporation and drawn off by a fan. If necessary, the solvents are incinerated, which is the case for organic solvents.
- the organic solvents evaporated in the drying oven must be diluted, generally with air, to keep their solvent concentration below a certain limit and eliminate any risk of explosion due to the solvents.
- the drying oven is maintained in a slight vacuum to prevent any backflow outside the enclosure of generally toxic or dangerous solvents.
- the walls of the drying oven are relatively cold and condensation must be avoided, in particular on cold walls of evaporated solvents.
- hot air is injected into the oven, for example as described in FR 2 734 501. In a vertical oven, hot air is injected at the bottom and at the top of the oven, with a racking injected air.
- Horizontal drying ovens are limited in length by controlling the position of the strip, which cannot be supported until its coating is sufficiently dry to withstand the stresses of contact with this support.
- the drying ovens are installed vertically to avoid problems of belt deflection. Vertical drying ovens, by the difference between their internal temperature and the ambient temperature, behave like a chimney and a circulation of air from the bottom to the top is established spontaneously. Significant quantities of fresh air, in particular from the lower opening of the oven, are removed, mixed with the hot air injected and drawn off.
- parasitic air inlets dilute the hot air injected intended to avoid the phenomena of condensation of the solvents, so that it is necessary to increase the temperature of injection of hot air so that the mixture with the cold air sucked is maintained at a sufficient temperature. This results in a loss of thermal efficiency, poor control of the concentration of solvents and a malfunction of the withdrawal injection circuit which must be oversized.
- the gas outlet for the upper opening of the oven poses a risk of explosion, degrades the working conditions of the operators and produces solvent condensation on the equipment located nearby.
- a vertical drying oven has at its lower entrance a passage window for the strip. We could have thought of reducing the dimensions of this window to slow down the entry of parasitic air.
- the method for drying a non-metallic coating on a steel strip is characterized in that a dynamic brake is produced by injecting hot air between the lower part and the upper part of the oven and away from the inlet and outlet of the oven, and by creating an overpressure in the tunnel of the drying oven so as to limit the entry of parasitic cold air and the effect chimney in the vertical oven.
- a dynamic brake is produced by injecting hot air between the lower part and the upper part of the oven and away from the inlet and outlet of the oven, and by creating an overpressure in the tunnel of the drying oven so as to limit the entry of parasitic cold air and the effect chimney in the vertical oven.
- the dynamic brake is produced below one of these withdrawal points, close to the latter.
- this hot blown air is used in order to constitute a point for holding the strip to limit its oscillations over the length of the oven.
- the method may provide for the implementation of two superimposed sets of hot air blowing orifices of the dynamic barrier.
- the air used to create the dynamic brake can be recycled.
- the recycled air used to create the dynamic brake can be drawn in the vicinity of the blow holes of the dynamic brake.
- the method advantageously comprises the use of adjustment members intended to adjust the flow rate or the pressure of the hot air of the dynamic brake according to the production parameters, the nature of the product to be treated or the characteristics of the solvents released.
- control members can be controlled by an automatic oven control system depending on the operating conditions of the oven and the nature of the product and its coating.
- the invention also relates to a device for drying a coating, in particular a layer of paint on a steel strip, comprising a vertical drying oven with relatively cold walls and comprising heating means, in particular by electromagnetic induction, of the strip which crosses this furnace, means for injecting hot air in the lower part and upper part of the furnace to prevent condensation of vapors on the walls of the furnace and a means for withdrawing the injected air.
- Such a device according to the invention is characterized in that it comprises, between the bottom part and the top part of the oven, means for injecting hot air into the oven and for producing a dynamic brake limiting the entry of parasitic cold air by creating a local overpressure in the drying oven.
- the injection of air from the dynamic barrier comprises a box making it possible to blow the hot air into the oven through one or more orifices, on one or more two sides of the strip.
- the blowing orifices can be arranged over a large part of the width of the strip.
- the hot air blowing orifices can be produced in the form of holes or nozzles so as to hold the strip in line with these orifices.
- the air injection means can comprise boxes making it possible to blow hot air into the oven.
- the box can be equipped with means for adjusting the flow rates of the injected air as well as the shape of the injected air jets.
- the air injected by the box can advantageously be recirculated by a fan.
- Two or more blowing assemblies can be implemented in the box in order to reinforce the maintenance of the strip and the efficiency of the dynamic barrier.
- Adjusting members can be implemented on the hot air ducts supplying each set of blowing holes in order to allow independent adjustment of the pressures in the oven enclosures located below and above the dynamic barrier.
- Fig. 1 is a diagram in elevation of a drying device according to the state of the art.
- Fig. 2 is a diagram in elevation of a drying device according to the invention.
- Fig. 3, 4 and 5 are diagrams in elevation of alternative embodiments of the device of FIG. 2.
- a non-metallic coating line in particular a line for applying a layer of paint to a steel strip comprises a section for preparing the surface of the strip not shown in FIG. 1, followed by a machine 6 for applying a liquid film of the coating, in particular paint, to the strip 1.
- the application is generally provided by coating using rollers.
- the strip 1 with its coating then passes into the drying section formed by the oven forming a tunnel 3.
- the strip runs vertically in this oven as illustrated in FIG. 1. Drying is obtained by bringing the steel strip 1 and the coating film to the required temperature allowing the coating to be dried and cured.
- the heating of the strip 1 can advantageously be carried out using an electromagnetic induction system not shown in the figure.
- the solvents of the coating applied to the strip 1 are removed by evaporation and drawn off by a fan 7 placed on a drawing duct connected to the internal space of the oven at 4 situated in height between the entry 5 at the bottom. and exit 2 located in the upper part.
- hot air is injected at the bottom and at the top of the oven, respectively at 10a and 10b as described, for example, in FR-A-2 734 501.
- This hot air is injected into the oven enclosure by means of a fan 8, the injected hot air flows can be adapted by manual or automatic valves such as 9a and 9b.
- Large quantities of fresh air coming in particular from the lower opening 5 dilute the hot air injected at 10a and 10b, which requires increasing the temperature of this injected air.
- Fig. 2 shows a section in elevation of a drying oven equipped with the invention.
- a dynamic brake is produced in the oven to create an overpressure inside the oven and limit the entry of parasitic cold air.
- the dynamic brake created by the injection of air is provided under the draw point 4 or close to this point.
- the injection means can comprise a box 12 made in one or more parts as shown diagrammatically in FIG. 2 by 12a and 12b with blowing orifices 13a and 13b and their hot air supplies by means of the fan 8.
- the parts 12a, 12b of the box project inside the furnace in the direction of the strip 1 so that the distance between this strip 1 and the blowing orifices 13a, 13b is relatively reduced, and less than the distance separating the strip 1 of the vertical walls of the oven.
- the direction of the width of the strip 1 is perpendicular to the plane of FIG. 2.
- An adjusting member 11 with manual or automatic control, makes it possible to adjust the flow and / or pressure characteristics of the hot air injected into the box 12 through the orifices 13 as a function of the setting of the oven, of the type of production carried out or characteristics of the coating deposited on the strip and of the solvents produced.
- the adjusting member 11 can be manual or automatic operating under the control of the oven control device.
- the orifices 13a and 13b can be positioned and dimensioned so as to carry out an injection of hot air concentrated in a reduced number of points or produced according to a series of holes distributed over the entire width of the strip on each side thereof. or even produced in the form of a continuous opening in the form of a blowing nozzle over the entire width of the strip. In general, the blowing is carried out in a direction orthogonal to the plane of the strip 1.
- the orifices 13a and 13b can be produced in the known form of blowing nozzles intended, in addition to controlling the chimney effect in the oven, to ensure that the strip is held in place for, for example, limiting its beating during its passage through the oven .
- the blowing box is separated horizontally by a partition so as to obtain two boxes 15 (15a, 15b) and 16 (16a, 16b) superimposed and each comprising a set of blowing orifices.
- Fig. 3 shows an example of this embodiment with, from the fan 8, two separate hot air supplies for the upper and lower box, each of these supplies being equipped with an adjustment member 14a and 14b.
- the blowing orifices of the boxes 15a and 15b as well as 16a and 16b can be respectively oriented upwards and downwards in order to facilitate the adjustment of the pressures in the upper and lower parts of the oven and limit the chimney effect.
- Fig. 4 shows a variant of the device of FIG. 2 for which the hot air blown by the box 12 is blown by an independent fan 17 in order to allow an adjustment of the pressure level of the air blown in the box 12 of the dynamic brake independently of the pressure level delivered by the fan d air injection 8.
- the fan 17 supplying the box 12 can be supplied with hot air at the outlet of the fan 8 as shown in the figure, at the inlet of the fan 8 or supplied by any other network at pressure and temperature different from those used for injecting air into the oven at 10a and 10b.
- Fig. 5 shows a variant of the device of FIG. 4.
- the fan 17 for supplying hot air to the box 12 recirculates this air by means of suction 19a and 19b as well as 20a and 20b.
- suction points may be located near the blowing points of the box 12 of the dynamic brake in order to improve the efficiency of the device or be simply connected to the enclosure 3.
- the variants of Figs. 4 and 5 can be produced with a dynamic brake box produced according to FIG. 3.
- the withdrawal sheath 4 can be located substantially halfway up the oven.
- the box 12 is located below the withdrawal point 4.
- the temperature of the hot air injected into the oven can be of the order of 250 ° C.
- the running speed of the strip can typically be between 60 and 120 m / min. All the combinations of the devices described with their adjustment members make it possible to create a dynamic barrier in the oven with hot air so as to slow down the parasitic air flow, in particular the ascending flow created by the chimney effect, and therefore limit the entry of parasitic air.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Drying Of Solid Materials (AREA)
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0308683A FR2857734B1 (fr) | 2003-07-16 | 2003-07-16 | Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier |
| PCT/FR2004/001701 WO2005017433A2 (fr) | 2003-07-16 | 2004-07-01 | Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1644680A2 true EP1644680A2 (fr) | 2006-04-12 |
| EP1644680B1 EP1644680B1 (fr) | 2011-06-15 |
Family
ID=33548178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04767544A Expired - Lifetime EP1644680B1 (fr) | 2003-07-16 | 2004-07-01 | Procede et dispositif de sechage d'un revetement non metallique sur une bande d'acier. |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1644680B1 (fr) |
| CN (1) | CN100462656C (fr) |
| AT (1) | ATE513174T1 (fr) |
| AU (1) | AU2004265466B2 (fr) |
| FR (1) | FR2857734B1 (fr) |
| WO (1) | WO2005017433A2 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115014068A (zh) * | 2022-06-07 | 2022-09-06 | 中冶南方工程技术有限公司 | 带钢吹边装置 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010024840B4 (de) * | 2010-06-23 | 2016-09-22 | Eisenmann Se | Trockner |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1299667B (de) * | 1965-01-20 | 1969-07-24 | Trockentechnik Kurt Brueckner | Einrichtung zur thermischen Behandlung einer bewegten flaechenfoermigen Warenbahn |
| US3509638A (en) * | 1966-08-04 | 1970-05-05 | Midland Ross Corp | Treating apparatus |
| US3510960A (en) * | 1967-06-10 | 1970-05-12 | Hisayoshi Kubodera | Vertical drying machine |
| CH567235A5 (en) * | 1974-04-03 | 1975-09-30 | Galentan Ag | Dryer for continuous plated strip - as sealed chamber through which pressurised air is blown onto strip |
| US3924569A (en) * | 1974-08-28 | 1975-12-09 | Goodyear Tire & Rubber | Apparatus for treating tire cord fabric |
| US4370357A (en) * | 1981-03-11 | 1983-01-25 | Cleveland Gear Company | Process of continuous metal coating |
| US5263265A (en) * | 1989-10-23 | 1993-11-23 | Despatch Industries | Convection/radiation material treatment oven |
| US5041312A (en) * | 1990-02-13 | 1991-08-20 | Swartz Leroy | Apparatus and method for coating a metal strip |
| JP3282240B2 (ja) * | 1992-10-03 | 2002-05-13 | 住友金属工業株式会社 | 帯状材の連続塗装方法 |
| FR2734501B1 (fr) * | 1995-05-23 | 1997-07-04 | Stein Heurtey | Procede et dispositif de revetement de bandes metalliques |
| CN2273838Y (zh) * | 1996-08-06 | 1998-02-04 | 机械工业部西安重型机械研究所 | 气垫式带材烘干炉 |
| DE19908743A1 (de) * | 1999-03-01 | 2000-09-07 | Sms Demag Ag | Verfahren und Vorrichtung zum Trocknen und Trockenhalten von insbesondere Kaltband im Auslaufbereich von Kaltwalz- und Bandanlagen |
-
2003
- 2003-07-16 FR FR0308683A patent/FR2857734B1/fr not_active Expired - Lifetime
-
2004
- 2004-07-01 AU AU2004265466A patent/AU2004265466B2/en not_active Ceased
- 2004-07-01 AT AT04767544T patent/ATE513174T1/de not_active IP Right Cessation
- 2004-07-01 CN CNB2004800203496A patent/CN100462656C/zh not_active Expired - Fee Related
- 2004-07-01 WO PCT/FR2004/001701 patent/WO2005017433A2/fr not_active Ceased
- 2004-07-01 EP EP04767544A patent/EP1644680B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005017433A3 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115014068A (zh) * | 2022-06-07 | 2022-09-06 | 中冶南方工程技术有限公司 | 带钢吹边装置 |
| CN115014068B (zh) * | 2022-06-07 | 2023-07-28 | 中冶南方工程技术有限公司 | 带钢吹边装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2005017433A3 (fr) | 2005-05-06 |
| CN100462656C (zh) | 2009-02-18 |
| FR2857734A1 (fr) | 2005-01-21 |
| ATE513174T1 (de) | 2011-07-15 |
| EP1644680B1 (fr) | 2011-06-15 |
| AU2004265466A1 (en) | 2005-02-24 |
| FR2857734B1 (fr) | 2005-09-02 |
| WO2005017433A2 (fr) | 2005-02-24 |
| AU2004265466B2 (en) | 2010-04-29 |
| CN1823251A (zh) | 2006-08-23 |
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