EP0260533B1 - Procédé et dispositif pour enlever de tôles la couche fondue qui les recouvre - Google Patents

Procédé et dispositif pour enlever de tôles la couche fondue qui les recouvre Download PDF

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Publication number
EP0260533B1
EP0260533B1 EP87112839A EP87112839A EP0260533B1 EP 0260533 B1 EP0260533 B1 EP 0260533B1 EP 87112839 A EP87112839 A EP 87112839A EP 87112839 A EP87112839 A EP 87112839A EP 0260533 B1 EP0260533 B1 EP 0260533B1
Authority
EP
European Patent Office
Prior art keywords
gas
nozzles
bath
sheet material
sheet
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.)
Expired - Lifetime
Application number
EP87112839A
Other languages
German (de)
English (en)
Other versions
EP0260533A3 (en
EP0260533A2 (fr
Inventor
Paul Fontaine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fontaine Engineering und Maschinen GmbH
Original Assignee
Unitas SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Unitas SA filed Critical Unitas SA
Priority to AT87112839T priority Critical patent/ATE73176T1/de
Publication of EP0260533A2 publication Critical patent/EP0260533A2/fr
Publication of EP0260533A3 publication Critical patent/EP0260533A3/de
Application granted granted Critical
Publication of EP0260533B1 publication Critical patent/EP0260533B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/14—Removing excess of molten coatings; Controlling or regulating the coating thickness
    • C23C2/16—Removing excess of molten coatings; Controlling or regulating the coating thickness using fluids under pressure, e.g. air knives
    • C23C2/18—Removing excess of molten coatings from elongated material
    • C23C2/20—Strips; Plates

Definitions

  • the invention relates to a method for stripping sheet metal coated in a galvanizing or hot-coating system with the features of the preamble of patent claim 1.
  • the invention also relates to a device for carrying out this method with the features of the preamble of patent claim 2.
  • the surfaces of the coated sheet can be blown off with air.
  • this leads to oxidation or other influence on the coating material, which in turn can lead to defects on the coated surfaces.
  • the move has been made to use inert gas such as nitrogen gas to blow off the coated sheet metal surfaces.
  • inert gas such as nitrogen gas
  • nitrogen is used in the process known from DE-OS-30 14 651, so that part of it Nitrogen can be reused via the gas outlet in the housing, an equal part of the nitrogen, that is to say about 50%, but cannot be reused, since after blowing the sheet metal material there is insufficient separation of the related nitrogen and the air in the container comes.
  • EP-A-0 122 856 a device is known in which a sheet material is also blown by means of blow-off nozzles, but here two pairs of blow-off nozzles are used and gas recirculation is to be made possible via gas return connections arranged in the housing surrounding the blow-off nozzles, which, however, are arranged above the blow-off nozzles, so that in the case of EP-A -0 122 856 known device, the efficiency of gas recirculation is not sufficiently high.
  • the invention has for its object to provide a method for stripping coated in a galvanizing or hot-dip coating system and a device for performing this method, which on the one hand significantly increases the efficiency in the recovery of the gas necessary for blowing and on the other hand a device for Provides implementation of this method, in which a constant control of the melt level can largely be dispensed with.
  • an inert gas By blowing off the sheet with sulfur hexafluoride or a gas mixture containing this gas, an inert gas is chosen which is clear, that is to say several times heavier than air, so that due to its own weight it falls more or less vertically downwards. Therefore, it can be caught relatively easily and one can be used again, i.e. it can be recycled.
  • inert gases such as nitrogen gas
  • nitrogen gas which have hitherto been used to blow off coated sheet metal surfaces
  • the recovery of such gases is therefore poor and only possible incompletely.
  • gases cannot adequately or completely shield the surface of the melt of the coating material in the bath of a galvanizing or hot-coating system against the effect of air (oxygen).
  • a gas such as sulfur hexafluoride is about five times heavier than nitrogen gas and much heavier than air, so that it separates itself from air precisely on the basis of its own weight and, accordingly, can also be aspirated and reused. In the border area between this gas and air, there are no zones in which a mixture between air and this gas takes place and oxidation is possible. In addition, the relatively heavy sulfur hexafluoride does not rise to the top and therefore only has to be ensured for the recovery that it can sink downwards in a defined zone or a defined space, from where it can be removed for reuse and thus recovered .
  • the shell contains an extension portion within its side and end walls and the shell is provided on the lower edge with buoyancy or floating bodies that come into contact with the melt in the bath, is achieved that the shell with the help of the bottom edge of buoyancy or floating bodies stands floating on the melt in the bath, so that any fluctuations in the melt level are automatically compensated for, this effect being reinforced or promoted in a special way by the corresponding extension sections, which make it possible for the shell to be permanently installed on its top and only the extension section, together with the part of the casing located underneath, adapts to the fluctuations in the melt level.
  • extension section is designed in the manner of a bellows, a configuration of the extension section is chosen which is characterized by high flexibility, so that the lower part can float on the melt in a particularly advantageous manner by means of the buoyancy or floating bodies, while the upper part the envelope is attached to a fixed point.
  • the position of the casing in the device can thereby be fixed precisely without the adaptability to the height of the melting level being impaired.
  • a zinc melt (2) In a bath tank (1) of a galvanizing plant, not shown in detail, there is a zinc melt (2), the level (3) of which can be varied within certain limits in accordance with the consumption of zinc material and the amount of refill.
  • At least one deflection roller (4) is immersed in the melt, through which strip material (5) is guided, which sheet material can be and which runs through the device in the direction of an arrow (6) in a manner not shown. Further guide elements for the strip material (5) are omitted for the sake of simplifying the illustration.
  • blowing nozzles (7 and 8) of known design opposite to each other, to which a blower (9) is connected via lines (10 and 11) to these blowing nozzles (7 and 8) gas, which is heavier than Air is, for example sulfur hexafluoride, under pressure.
  • Air is, for example sulfur hexafluoride
  • This gas is blown out of the facing slot-shaped nozzle openings (12 and 13) so that it forms an approximately horizontal curtain through which the strip material (5) passes.
  • excess coating material which has been taken from the melt (2) of the bath container (1) is wiped off the surface of the strip material (5).
  • blowing nozzles (7 and 8) are accommodated in a box-like casing (14), the upper wall (15) of which contains a relatively wide slot-like opening (16) through which the strip material (5) can exit.
  • a circumferential floating body (21) which supports the side wall sections (17a and 18a) on the melt (2) and submerges them somewhat under their mirror (3), so that it forms a circumferential seal, which prevents the escape of gas blown into the casing (14) by the blowing nozzles (7 and 8) under the lower edge of the casing.
  • connection piece (22) to which a line (23) is connected which leads to the suction side of the blower (9).
  • the blower (9) thus sucks the gas used to feed the blowing nozzles (7 and 8) from the lower part of the casing (14). Since practically no gas is lost, little additional gas is needed to feed the blowing nozzles (7 and 8).
  • the gas or gas mixture lying on the surface of the molten metal which is heavier than air, protects the melt against corrosion. But it is also heat-insulating and offers sound insulation.
  • Carbon dioxide for example, is suitable as a mixing component for sulfur hexafluoride.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (3)

  1. Procédé de décapage d'une tôle revêtue dans une installation de zingage ou de placage à la flamme immédiatement après que la tôle revêtue ait quitté un bain de matière de revêtement en fusion, où l'on souffle sur les deux côtés de la tôle un mince rideau de courant gazeux formé d'un gaz inerte qui est nettement plus lourd que l'air, et on recycle au moins partiellement le gaz, caractérisé en ce qu'on souffle sur la tôle de l'hexafluorure de soufre ou un mélange gazeux contenant ce gaz.
  2. Dispositif d'enlèvement de l'excès de matière de revêtement de la surface d'une tôle (5) qui a passé dans une installation de zingage ou de placage à la flamme dans un bain (2) fait d'une matière de revêtement en fusion, avec deux buses (7, 8) de soufflage disposées l'une en face de l'autre un peu au-dessus du bain (2), qui forment un mince courant gazeux en rideau aux fins de soufflage sur les deux côtés de la tôle en forme de bande passant entre elles, où les deux buses de gaz (7, 8) sont disposées dans une enveloppe en forme de coffre (14), dont les parois latérales et frontales (17, 18) atteignent au moins jusqu'au niveau (3) de la masse en fusion du bain (2), et contiennent à leur partie supérieure (15) une ouverture (16) pour la tôle (5) traversant le dispositif et qui présentent en dessous des buses de soufflage (7, 8) qui y sont disposées un raccord (22) pour retirer le gaz soufflé par les buses de soufflage (7, 8), afin de réaliser le procédé selon la revendication 1, caractérisé en ce que l'enveloppe (14) contient à l'intérieur de ses parois latérales et frontales (17, 18) une section d'allongement (19, 20) et en ce que l'enveloppe (14) est munie à son bord inférieur de flotteurs (21) qui entrent en contact avec la masse fondue (2) se trouvant dans le récipient (1).
  3. Dispositif selon la revendication 2, caractérisé en ce que la section d'allongement (19, 20) est formée en accordéon.
EP87112839A 1986-09-19 1987-09-03 Procédé et dispositif pour enlever de tôles la couche fondue qui les recouvre Expired - Lifetime EP0260533B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87112839T ATE73176T1 (de) 1986-09-19 1987-09-03 Verfahren und vorrichtung zum abstreifen von mit schmelzfluessigem material beschichtetem blech.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3631893 1986-09-19
DE19863631893 DE3631893A1 (de) 1986-09-19 1986-09-19 Verfahren und vorrichtung zum abstreifen von mit schmelzfluessigem material beschichtetem blech

Publications (3)

Publication Number Publication Date
EP0260533A2 EP0260533A2 (fr) 1988-03-23
EP0260533A3 EP0260533A3 (en) 1989-03-15
EP0260533B1 true EP0260533B1 (fr) 1992-03-04

Family

ID=6309928

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112839A Expired - Lifetime EP0260533B1 (fr) 1986-09-19 1987-09-03 Procédé et dispositif pour enlever de tôles la couche fondue qui les recouvre

Country Status (8)

Country Link
US (1) US4862825A (fr)
EP (1) EP0260533B1 (fr)
JP (1) JPS6386854A (fr)
AT (1) ATE73176T1 (fr)
AU (1) AU600019B2 (fr)
DE (2) DE3631893A1 (fr)
ES (1) ES2030406T3 (fr)
GR (1) GR3004037T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101222346B1 (ko) 2010-12-13 2013-01-14 동부제철 주식회사 용융도금강판 제조장치

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010801C2 (de) * 1990-04-04 1998-07-23 Unitas Sa Vorrichtung zum Abstreifen von laufendem Bandmaterial
US6861159B2 (en) * 1992-03-27 2005-03-01 The Louis Berkman Company Corrosion-resistant coated copper and method for making the same
US5597656A (en) * 1993-04-05 1997-01-28 The Louis Berkman Company Coated metal strip
US5491036A (en) * 1992-03-27 1996-02-13 The Louis Berkman Company Coated strip
US6794060B2 (en) 1992-03-27 2004-09-21 The Louis Berkman Company Corrosion-resistant coated metal and method for making the same
US6080497A (en) * 1992-03-27 2000-06-27 The Louis Berkman Company Corrosion-resistant coated copper metal and method for making the same
US6652990B2 (en) 1992-03-27 2003-11-25 The Louis Berkman Company Corrosion-resistant coated metal and method for making the same
RU2319786C2 (ru) * 2002-06-28 2008-03-20 Смс Демаг Акциенгезелльшафт Применение разделяющего газа при непрерывном нанесении покрытия погружением в расплав
FR2857280A1 (fr) * 2003-07-08 2005-01-14 Dominique Laurain Cuve d'enduction pour enduction uniforme de pieces defilant unitairement et comportant au moins un moyen de soufflage
DE10333766B4 (de) * 2003-07-23 2009-01-22 Thyssenkrupp Steel Ag Verfahren und Vorrichtung zum Schmelztauchbeschichten von Metallband
DE102004021214B4 (de) * 2004-04-29 2007-11-22 Air Liquide Gmbh Verfahren und Vorrichtung zur Inertisierung der Umgebung eines laufenden Bandmaterials nach einer Tauchbehandlung
BE1018124A3 (fr) * 2008-07-01 2010-05-04 Ct Rech Metallurgiques Asbl Procede d'essorage de bandes metalliques.
CN109207897B (zh) * 2017-12-12 2020-06-16 朱正直 一种镀锡设备
US11357341B2 (en) * 2019-02-26 2022-06-14 Fasteners For Retail, Inc. Retail merchandise display device with security shield

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE369436C (de) * 1920-11-12 1923-02-19 Childe Harold Wills Umlaufgeblaese fuer Kohlenwasserstoffmotoren
DE617024C (de) * 1929-06-12 1935-08-10 Karl Daeves Dr Ing Verfahren zur Verhinderung der Bildung weissen Rostes bei verzinkten Waren
AU421751B2 (en) * 1968-03-08 1972-02-25 Australian Wire Industries Pty, Ltd Improved method of and apparatus for wiping galvanised wire or strip
US3842896A (en) * 1973-06-04 1974-10-22 Monsanto Co Method for producing composite metal wire
JPS5591967A (en) * 1978-12-30 1980-07-11 Nippon Steel Corp One-side hot dipping method for steel strip
AU538925B2 (en) * 1979-04-16 1984-09-06 Ak Steel Corporation Finishing of hop dip coating of ferrous base metal
US4330574A (en) * 1979-04-16 1982-05-18 Armco Inc. Finishing method for conventional hot dip coating of a ferrous base metal strip with a molten coating metal
US4287238A (en) * 1980-04-11 1981-09-01 Bethlehem Steel Corporation Protective atmosphere gas wiping apparatus and method of using
JPS57198253A (en) * 1981-05-29 1982-12-04 Nippon Steel Corp Continuous zinc hot dipping method
FR2544337B1 (fr) * 1983-04-13 1985-08-09 Ziegler Sa Procede et installation pour le revetement en continu d'une bande a l'aide d'un revetement oxydable

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101222346B1 (ko) 2010-12-13 2013-01-14 동부제철 주식회사 용융도금강판 제조장치

Also Published As

Publication number Publication date
GR3004037T3 (fr) 1993-03-31
JPS6386854A (ja) 1988-04-18
AU7816087A (en) 1988-03-24
US4862825A (en) 1989-09-05
EP0260533A3 (en) 1989-03-15
DE3777040D1 (de) 1992-04-09
AU600019B2 (en) 1990-08-02
EP0260533A2 (fr) 1988-03-23
ATE73176T1 (de) 1992-03-15
DE3631893A1 (de) 1988-03-31
ES2030406T3 (es) 1992-11-01

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