EP0260533A2 - 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
EP0260533A2
EP0260533A2 EP87112839A EP87112839A EP0260533A2 EP 0260533 A2 EP0260533 A2 EP 0260533A2 EP 87112839 A EP87112839 A EP 87112839A EP 87112839 A EP87112839 A EP 87112839A EP 0260533 A2 EP0260533 A2 EP 0260533A2
Authority
EP
European Patent Office
Prior art keywords
gas
sheet
bath
blown
casing
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
Application number
EP87112839A
Other languages
German (de)
English (en)
Other versions
EP0260533A3 (en
EP0260533B1 (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 with molten material and in particular for stripping sheet metal or sheet material coated in a galvanizing or hot-dip coating system immediately after the coated sheet has left a bath of molten coating material, with both sides of the strip-like or sheet-like sheet be blown off with a curtain-like thin gas jet.
  • the invention relates to an apparatus for performing this method with two glass nozzles arranged opposite one another close above the bath passing through the sheet, which form a curtain-like thin gas jet for blowing off both sides of the strip-shaped sheet or sheet material passing between them.
  • the surfaces of the coated sheet can be blown off with air.
  • this leads to an oxidation or other influence on the coating material, which in turn can result in defects on the coated surfaces. Therefore one has gone over to Blow off the coated sheet metal surfaces to use inert gas such as nitrogen gas.
  • inert gas such as nitrogen gas.
  • the invention is based on the object of being able to carry out the coating of sheet metal coated in a galvanizing or hot-coating installation and in particular continuously of strip-like sheet material passing through such an installation on the one hand without undesirable oxidation phenomena and on the other hand as inexpensively as possible.
  • the method of the type mentioned at the outset is designed in that the sheet or strip-shaped sheet material is blown off with an inert gas, which is significantly heavier than air and is circulated.
  • the sheet is blown off with sulfur hexafluoride or a mixture thereof.
  • the inert gases such as nitrogen gas used to blow off coated sheet metal surfaces are only relatively little heavier than air and, because of their own weight, do not separate easily and precisely enough from air. The recovery of such gases is therefore poor and only possible incompletely. Also, such 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 action of air.
  • 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 due to its own weight and can therefore be aspirated and used again. There are no zones in the border area between this gas and air in which mixing between air and this gas takes place and oxidation is possible.
  • 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 in a defined zone or space, from where it can be removed for reuse and thus recovered .
  • the object of the invention is achieved with a device for stripping excess coating material from the surface of sheet metal, in which the two blowing nozzles arranged opposite one another above a bath of molten coating material are arranged in a box-like shell, the side and end walls of which are at least open reach the melt level of the bath and which contains at the top of an opening for the leaking continuous sheet material.
  • This box-like shell which is to be regarded as a kind of housing and extends with its side and end walls to the melting level of the bath, forms a chamber with the melt, from which the gas blown out of the blowing nozzles cannot escape uncontrollably, as long as it is ensured that sufficient gas is removed from the casing for recovery.
  • blow-in gas does not escape through the opening for the leaking sheet material provided at the top of the casing, because it is heavier than oxygen and therefore has a tendency to sink downwards. Only if the gas from the shroud would not be discharged could it escape from the top opening over time.
  • a connection for discharging the gas blown out of the blow nozzles is provided on the shell below the blowing nozzles arranged in the shell .
  • a suction line with a suction fan can be connected to this connection.
  • the shell is always in the right way with the melt in the bath in connection, according to a further feature of the invention, the shell is provided on the lower edge with buoyancy or floating bodies that come into contact with the melt in the bath and, so to speak, on the Float melt. Accordingly, fluctuations in the level of the melt level compensate themselves automatically.
  • the envelope is provided within its side and end walls with an extension section which can be designed in the manner of a bellows.
  • an extension section which can be designed in the manner of a bellows.
  • a zinc melt (2) In a bath tank (1) of a galvanizing plant, not shown, 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 may be required 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.
  • a siphon i.e. a U-shaped or similarly shaped pipe elbow, filled at its deepest part with sulfur hexafluoride or a mixture thereof, which is heavier than air, in order to separate two gases, a liquid and a gas or also a metal melt from the surrounding atmosphere.
  • Carbon dioxide for example, is suitable as a mixed 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)
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 true EP0260533A2 (fr) 1988-03-23
EP0260533A3 EP0260533A3 (en) 1989-03-15
EP0260533B1 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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN107881451A (zh) * 2017-12-12 2018-04-06 蒋丁贵 一种镀锡设备

Families Citing this family (13)

* 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
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
US6861159B2 (en) * 1992-03-27 2005-03-01 The Louis Berkman Company Corrosion-resistant coated copper 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
US6080497A (en) * 1992-03-27 2000-06-27 The Louis Berkman Company Corrosion-resistant coated copper metal and method for making the same
WO2004003250A1 (fr) * 2002-06-28 2004-01-08 Sms Demag Aktiengesellschaft Utilisation de gaz de separation lors de la finition en continue de metaux par immersion a chaud
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.
KR101222346B1 (ko) 2010-12-13 2013-01-14 동부제철 주식회사 용융도금강판 제조장치
US11357341B2 (en) * 2019-02-26 2022-06-14 Fasteners For Retail, Inc. Retail merchandise display device with security shield

Family Cites Families (9)

* 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
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
AU538925B2 (en) * 1979-04-16 1984-09-06 Ak Steel Corporation Finishing of hop dip coating of ferrous base metal
US4287238A (en) * 1980-04-11 1981-09-01 Bethlehem Steel Corporation Protective atmosphere gas wiping apparatus and method of using
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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN107881451A (zh) * 2017-12-12 2018-04-06 蒋丁贵 一种镀锡设备

Also Published As

Publication number Publication date
DE3777040D1 (de) 1992-04-09
ES2030406T3 (es) 1992-11-01
EP0260533A3 (en) 1989-03-15
JPS6386854A (ja) 1988-04-18
ATE73176T1 (de) 1992-03-15
GR3004037T3 (fr) 1993-03-31
EP0260533B1 (fr) 1992-03-04
AU7816087A (en) 1988-03-24
US4862825A (en) 1989-09-05
AU600019B2 (en) 1990-08-02
DE3631893A1 (de) 1988-03-31

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