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EP0066523A1 - Apparatus for the surface treatment of galvanized sheet iron in a confined atmosphere - Google Patents

Apparatus for the surface treatment of galvanized sheet iron in a confined atmosphere Download PDF

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Publication number
EP0066523A1
EP0066523A1 EP82401011A EP82401011A EP0066523A1 EP 0066523 A1 EP0066523 A1 EP 0066523A1 EP 82401011 A EP82401011 A EP 82401011A EP 82401011 A EP82401011 A EP 82401011A EP 0066523 A1 EP0066523 A1 EP 0066523A1
Authority
EP
European Patent Office
Prior art keywords
fan
sheet metal
strip
zinc
passage
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.)
Withdrawn
Application number
EP82401011A
Other languages
German (de)
French (fr)
Inventor
Robert Wang
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.)
Fives Stein SA
Original Assignee
Stein Heurtey 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 Stein Heurtey SA filed Critical Stein Heurtey SA
Publication of EP0066523A1 publication Critical patent/EP0066523A1/en
Withdrawn legal-status Critical Current

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    • 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
    • C23C2/26—After-treatment
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • 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
    • C23C2/26—After-treatment
    • C23C2/265—After-treatment by applying solid particles to the molten coating

Definitions

  • the present invention relates to a device intended for treating surfaces of galvanized sheets in a confined atmosphere. It is more particularly aimed at obtaining galvanized sheets having the configuration known as "with very small flowers", that is to say having dimensions of the order of a millimeter, which gives the sheet a semi-shiny appearance. .
  • this device comprises: a fan, the suction of which is connected to a powder distributor, preferably zinc, and the discharge of which leads to a projection nozzle disposed opposite the sheet metal strip in continuous movement in coming from the galvanizing bath and covered with zinc not yet crystallized, the air flow being such that it freezes the liquid zinc before the strip leaves the device, and a box consisting of two housings symmetrical with respect to the sheet metal strip and delimiting between them a substantially vertical passage in which the sheet metal strip circulates, each casing comprising a projection nozzle connected to the discharge of the fan, and return slots disposed respectively at the upper part and at the lower part of each casing, said return slots being connected to the suction of the fan.
  • the present invention proposes to apply the device defined above for obtaining galvanized sheets with very small flowers, under a controlled atmosphere (N, or N + H, for example).
  • this invention relates to a device as specified above, further characterized in that it comprises means ensuring sealing, with respect to the external atmosphere and with respect to the other internal parts of the installation, the passage between the two casings of the box, in which the sheet metal strip circulates.
  • the sealing means are produced in the form of aerodynamic seals or gas curtain seals, in which the gas jets can come from an independent source, from the fan or from the recirculation circuit, after passing through a filtration system.
  • the device is made watertight, with respect to the external atmosphere and with respect to the other internal parts of the installation, by having, at the upper and lower parts of the box, aerodynamic seals or seals by gas curtain , respectively 30-30 'and 32-32'.
  • Each of these joints is constituted by a tube, such as 34, provided with slots 36 for blowing the gas jets constituting the gas curtain.
  • the pipes, such as 38, providing the gas supply can be connected to a separate source, or to the discharge of the fan 20, or to the recirculation circuit, after cleaning in a filtration means.
  • the operation of the device thus described is identical to that of the device described in the American patent mentioned above.
  • the gas (air) loaded with zinc powder is blown on the strip 10 via the blowing slots 16-16 ′, supplied by the fan 20, the suction of which is connected to the source of zinc. After passing along the strip, the gas is taken up through the slots 18-18 '. Thanks to the presence of the aerodynamic joints 30-30 ′, 32-32 ′, recirculation is carried out in a confined atmosphere (this atmosphere can consist, for example, of nitrogen or of a mixture of nitrogen and hydrogen) .

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  • 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)

Abstract

Device which comprises: a fan (20) whose suction is connected to a powder, preferably zinc powder, dispenser (28) and whose delivery ends in a spraying nozzle arranged facing the strip of sheet metal (10) running pass continuously, originating from the galvanising bath and coated with zinc which has not yet crystallised and a casing consisting of two housings (12-12') which are symmetrical in relation to the strip of sheet metal and defining between them a substantially vertical passage in which the strip travels, each housing comprising the said spraying nozzle (16-16' respectively) connected to the delivery of the fan, and return slits (18-18') arranged in the upper part and in the lower part of each housing respectively, these return slits being connected to the suction of the fan, this device being characterised in that it comprises means (30-30', 32-32') responsible for the leakproofing in relation to the external atmosphere and in relation to the other internal parts of the plant, of the passage between the two housings of the casing in which the strip of sheet metal travels. <IMAGE>

Description

La présente invention est relative à un dispositif destiné à assurer le traitement de surfaces de tôles galvanisées en atmosphère confinée. Elle vise plus particulièrement à l'obtention de tôles galvanisées présentant la configuration dite "à très petites fleurs", c'est-à-dire ayant des dimensions de l'ordre du millimètre, ce qui confère à la tôle un aspect semi-brillant.The present invention relates to a device intended for treating surfaces of galvanized sheets in a confined atmosphere. It is more particularly aimed at obtaining galvanized sheets having the configuration known as "with very small flowers", that is to say having dimensions of the order of a millimeter, which gives the sheet a semi-shiny appearance. .

Dans le brevet américain n° 4 111 154, au nom de Kissel et Wang, cédé à la Société Heurtey-Métallurgie, a été décrit un dispositif pour le traitement de surfaces de tôles galvanisées mettant en oeuvre un procédé qui consiste à projeter des particules finement divisées, notamment de zinc, en suspension dans de l'air, sur le revêtement liquide de zinc de la tôle provenant du bain de galvanisation, avant que ne soit produite la cristallisation de ce zinc.In the American patent n ° 4 111 154, in the name of Kissel and Wang, ceded to the Heurtey-Metallurgy Company, was described a device for the treatment of surfaces of galvanized sheets implementing a process which consists in projecting particles finely divided, in particular of zinc, suspended in air, on the liquid zinc coating of the sheet coming from the galvanizing bath, before the crystallization of this zinc is produced.

Selon ce brevet américain, ce dispositif comprend : un ventilateur dont l'aspiration est reliée à un distributeur de poudre, de zinc de préférence, et dont le refoulement aboutit à une buse de projection disposée en regard de la bande de tôle en défilement continu en provenance du bain de galvanisation et recouverte de zinc non encore cristallisé, le débit d'air étant tel qu'il assure un figeage du zinc liquide avant que la bande quitte le dispositif, et un caisson constitué de deux carters symétriques par rapport à la bande de tôle et délimitant entre eux un passage sensiblement vertical dans lequel circule la bande de tôle, chaque carter comportant une buse de projection raccordée au refoulement du ventilateur, et des fentes de reprise disposées respectivement à la partie supérieure et à la partie inférieure de chaque carter, lesdites fentes de reprise étant raccordées à l'aspiration du ventilateur.According to this American patent, this device comprises: a fan, the suction of which is connected to a powder distributor, preferably zinc, and the discharge of which leads to a projection nozzle disposed opposite the sheet metal strip in continuous movement in coming from the galvanizing bath and covered with zinc not yet crystallized, the air flow being such that it freezes the liquid zinc before the strip leaves the device, and a box consisting of two housings symmetrical with respect to the sheet metal strip and delimiting between them a substantially vertical passage in which the sheet metal strip circulates, each casing comprising a projection nozzle connected to the discharge of the fan, and return slots disposed respectively at the upper part and at the lower part of each casing, said return slots being connected to the suction of the fan.

La présente invention se propose d'appliquer le dispositif défini ci-dessus à l'obtention de tôles galvanisées à très petites fleurs, sous atmosphère contrôlée (N , ou N + H , par exemple).The present invention proposes to apply the device defined above for obtaining galvanized sheets with very small flowers, under a controlled atmosphere (N, or N + H, for example).

En conséquence, cette invention concerne un dispositif tel que spécifié ci-dessus, caractérisé en outre en ce qu'il comporte des moyens assurant l'étanchéité, par rapport à l'atmosphère extérieure et par rapport aux autres parties internes de l'installation, du passage entre les deux carters du caisson, dans lequel circule la bande de tôle.Consequently, this invention relates to a device as specified above, further characterized in that it comprises means ensuring sealing, with respect to the external atmosphere and with respect to the other internal parts of the installation, the passage between the two casings of the box, in which the sheet metal strip circulates.

Selon une caractéristique de cette invention, les moyens assurant l'étanchéité sont réalisés sous la forme de joints aérodynamiques ou joints par rideau de gaz, dans lesquels les jets de gaz peuvent provenir d'une source indépendante, du ventilateur ou du circuit de recirculation, après passage dans un système de filtration.According to a characteristic of this invention, the sealing means are produced in the form of aerodynamic seals or gas curtain seals, in which the gas jets can come from an independent source, from the fan or from the recirculation circuit, after passing through a filtration system.

D'autres caractéristiques et avantages de cette invention ressortiront de la description faite ci-après en référence au dessin annexé, dont la Figure unique est une vue en coupe transversale d'un exemple de réalisation d'un dispositif selon l'invention.Other characteristics and advantages of this invention will emerge from the description given below with reference to the appended drawing, the single figure of which is a cross-sectional view of an exemplary embodiment of a device according to the invention.

En se référant à la Figure unique, on voit qu'en dehors des moyens prévus pour assurer l'étanchéité, le dispositif est identique à celui décrit et représenté dans le brevet américain n° 4 111 154, notamment sur les Figures 2 à 6 de ce brevet. On ne le décrira donc pas en détail.Referring to the single Figure, it can be seen that apart from the means provided for sealing, the device is identical to that described and represented in American patent n ° 4 111 154, in particular ment in Figures 2 to 6 of this patent. It will therefore not be described in detail.

Ce dispositif comprend donc essentiellement :

  • - un caisson constitué de deux carters identiques 12, 12', disposés symétriquement par rapport à la bande de tôle 10 défilant en continu en provenance du bain de galvanisation (non représenté) et délimitant entre eux un passage vertical 14 dans lequel circule cette bande 10. Chaque carter 12, 12' comporte une buse en forme de fente, respectivement 16-16', pour projeter l'air tenant en suspension la poudre de zinc sur chacune des faces de la bande 10 (en variante, on peut prévoir une buse sur un seul carter, dans le cas où l'on veut réaliser un revêtement une face). Chaque carter comporte en outre deux fentes de reprise 18-18', disposées de chaque côté des buses de projection et qui sont reliées à l'aspiration du ventilateur 20, comme on le verra plus loin. Comme dans le brevet américain cité ci-dessus, chaque carter comporte des cloisons de séparation horizontales délimitant des conduites ou gaines qui débouchent respectivement sur les buses de projection (gaines 22-22') et sur les fentes de reprise (gaines 24-24');
  • - un ventilateur 20, dont l'aspiration est reliée à un distributeur de poudre 28, de zinc de préférence, dont le refoulement aboutit aux buses 16-16', et dont l'aspiration est reliée aux fentes de reprise 18-18' par l'intermédiaire d'un échangeur 26.
This device therefore essentially comprises:
  • - A box made up of two identical casings 12, 12 ′, arranged symmetrically with respect to the sheet metal strip 10 traveling continuously from the galvanizing bath (not shown) and delimiting between them a vertical passage 14 in which this strip 10 circulates Each casing 12, 12 ′ has a slot-shaped nozzle, respectively 16-16 ′, for projecting the air holding the zinc powder in suspension on each of the faces of the strip 10 (alternatively, a nozzle can be provided. on a single casing, if you want to make a coating on one side). Each casing further comprises two return slots 18-18 ', arranged on each side of the projection nozzles and which are connected to the suction of the fan 20, as will be seen below. As in the American patent cited above, each casing comprises horizontal partition walls delimiting conduits or sheaths which open respectively on the projection nozzles (sheaths 22-22 ') and on the return slots (sheaths 24-24');
  • a fan 20, the suction of which is connected to a powder distributor 28, preferably of zinc, the discharge of which leads to the nozzles 16-16 ', and the intake of which is connected to the return slots 18-18' by through an exchanger 26.

Selon l'invention, le dispositif est rendu étanche, par rapport à l'atmosphère extérieure et par rapport aux autres parties internes de l'installation, en disposant, aux parties supérieure et inférieure du caisson, des joints aérodynamiques ou joints par rideau de gaz, respectivement 30-30' et 32-32'.According to the invention, the device is made watertight, with respect to the external atmosphere and with respect to the other internal parts of the installation, by having, at the upper and lower parts of the box, aerodynamic seals or seals by gas curtain , respectively 30-30 'and 32-32'.

Chacun de ces joints est constitué par un tube, tel que 34, muni de fentes 36 pour l'insufflation des jets gazeux constituant le rideau de gaz. Les conduites, telles que 38, assurant l'alimentation en gaz, peuvent être raccordées à une source séparée, ou au refoulement du ventilateur 20, ou au circuit de recirculation, après nettoyage dans un moyen de filtration.Each of these joints is constituted by a tube, such as 34, provided with slots 36 for blowing the gas jets constituting the gas curtain. The pipes, such as 38, providing the gas supply, can be connected to a separate source, or to the discharge of the fan 20, or to the recirculation circuit, after cleaning in a filtration means.

Le fonctionnement du dispositif ainsi décrit est identique à celui du dispositif décrit dans le brevet américain mentionné ci-dessus. Le gaz (air) chargé en poudre de zinc est soufflé sur la bande 10 par l'intermédiaire des fentes de soufflage 16-16', alimentées par le ventilateur 20, dont l'aspiration est reliée à la source de zinc. Après son passage le long de la bande, le gaz est repris par les fentes 18-18'. Grâce à la présence des joints aérodynamiques 30-30', 32-32', on réalise une recirculation en atmosphère confinée (cette atmosphère pouvant être constituée, par exemple, d'azote ou d'un mélange d'azote et d'hydrogène).The operation of the device thus described is identical to that of the device described in the American patent mentioned above. The gas (air) loaded with zinc powder is blown on the strip 10 via the blowing slots 16-16 ′, supplied by the fan 20, the suction of which is connected to the source of zinc. After passing along the strip, the gas is taken up through the slots 18-18 '. Thanks to the presence of the aerodynamic joints 30-30 ′, 32-32 ′, recirculation is carried out in a confined atmosphere (this atmosphere can consist, for example, of nitrogen or of a mixture of nitrogen and hydrogen) .

Il demeure bien entendu que cette invention n'est pas limitée à l'exemple de réalisation décrit et représenté, mais qu'elle en englobe toutes les variantes.It remains to be understood that this invention is not limited to the embodiment described and shown, but that it encompasses all variants thereof.

Claims (3)

1. Dispositif pour le traitement de surfaces de tôles galvanisées en atmosphère confinée, qui comprend : un ventilateur (20) dont l'aspiration est reliée à un distributeur de poudre (28), de zinc de préférence, et dont le refoulement aboutit à une buse de projection disposée en regard de la bande de tôle (l 0)en défilement continu, en provenance du bain de galvanisation etrecouverte de zinc non encore cristallisé, et un caisson constitué de deux carters (12-12') symétriques par rapport à la bande de tôle et délimitant entre eux un passage sensiblement vertical dans lequel circule la bande, chaque carter comportant ladite buse de projection (16-16' , respectivement) raccordée au refoulement du ventilateur, et des fentes de reprise (18-18') disposées respectivement à la partie supérieure et à la partie inférieure de chaque carter, ces fentes de reprise étant raccordées à l'aspiratior. du ventilateur, ce dispositif étant caractérisé en ce qu'il comporte des moyens (30-30' ; 32-32') assurant l'étanchéité, par rapport à l'atmosphère extérieure et par rapport aux autres parties internes de l'installation, du passage entre les deux carters du caisson dans lequel circule la bande de tôle.1. Device for the treatment of galvanized sheet surfaces in a confined atmosphere, which comprises: a fan (20), the suction of which is connected to a powder distributor (28), preferably of zinc, and the discharge of which results in a projection nozzle arranged opposite the sheet metal strip (l 0) in continuous movement, coming from the galvanizing bath and covered with zinc not yet crystallized, and a box made up of two housings (12-12 ') symmetrical with respect to the sheet metal strip and delimiting between them a substantially vertical passage in which the strip circulates, each casing comprising said projection nozzle (16-16 ', respectively) connected to the discharge of the fan, and return slots (18-18') arranged respectively at the upper part and at the lower part of each casing, these return slots being connected to the aspiratior. of the fan, this device being characterized in that it comprises means (30-30 '; 32-32') ensuring the tightness, with respect to the external atmosphere and with respect to the other internal parts of the installation, of the passage between the two casings of the box in which the sheet metal strip circulates. 2. Dispositif selon la revendication 1, caractérisé en ce que les moyens assurant l'étanchéité sont réalisés sous la forme de joints aérodynamiques, encore appelés joints par rideau de gaz.2. Device according to claim 1, characterized in that the sealing means are produced in the form of aerodynamic seals, also called seals by gas curtain. 3. Dispositif selon la revendication 2, caractérisé en ce que les jets de gaz desdits joints aérodynamiques peuvent provenir d'une source telle que, notamment, source indépendante, ventilateur (20), ou du circuit de recirculation après passage dans un système de filtration.3. Device according to claim 2, characterized in that the gas jets of said aerodynamic seals can come from a source such as, in particular, independent source, fan (20), or from the recirculation circuit after passage through a filtration system .
EP82401011A 1981-06-03 1982-06-03 Apparatus for the surface treatment of galvanized sheet iron in a confined atmosphere Withdrawn EP0066523A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8111013A FR2507106B1 (en) 1981-06-03 1981-06-03 DEVICE FOR THE TREATMENT OF GALVANIZED SHEET SURFACES IN A CONFINED ATMOSPHERE
FR8111013 1981-06-03

Publications (1)

Publication Number Publication Date
EP0066523A1 true EP0066523A1 (en) 1982-12-08

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EP82401011A Withdrawn EP0066523A1 (en) 1981-06-03 1982-06-03 Apparatus for the surface treatment of galvanized sheet iron in a confined atmosphere

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FR (1) FR2507106B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117958A1 (en) * 1983-02-18 1984-09-12 Stein Heurtey Process and apparatus for making metallic composite coatings on metallic strips
FR2544337A1 (en) * 1983-04-13 1984-10-19 Ziegler Sa METHOD AND INSTALLATION FOR CONTINUOUS COATING OF A TAPE USING AN OXYDABLE COATING
FR2544336A1 (en) * 1983-04-13 1984-10-19 Ziegler Sa INSTALLATION FOR CONTINUOUS TAPE COATING, ESPECIALLY FOR GALVANIZING STEEL SHEET

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1419636A (en) * 1964-06-15 1965-12-03 Stein & Roubaix Heat treatment apparatus
US3941906A (en) * 1973-03-01 1976-03-02 Theodore Bostroem Hot dip metallizing process
FR2282472A1 (en) * 1974-08-20 1976-03-19 Nippon Steel Corp PLANT FOR THE ANALYTICAL TREATMENT OF A STEEL STRIP IN A CONTINUOUS PROCESSING LINE
US4111154A (en) * 1977-04-11 1978-09-05 Heurtey Metallurgie Apparatus for the surface treatment of galvanized sheet-iron

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1419636A (en) * 1964-06-15 1965-12-03 Stein & Roubaix Heat treatment apparatus
US3941906A (en) * 1973-03-01 1976-03-02 Theodore Bostroem Hot dip metallizing process
FR2282472A1 (en) * 1974-08-20 1976-03-19 Nippon Steel Corp PLANT FOR THE ANALYTICAL TREATMENT OF A STEEL STRIP IN A CONTINUOUS PROCESSING LINE
US4111154A (en) * 1977-04-11 1978-09-05 Heurtey Metallurgie Apparatus for the surface treatment of galvanized sheet-iron

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0117958A1 (en) * 1983-02-18 1984-09-12 Stein Heurtey Process and apparatus for making metallic composite coatings on metallic strips
FR2544337A1 (en) * 1983-04-13 1984-10-19 Ziegler Sa METHOD AND INSTALLATION FOR CONTINUOUS COATING OF A TAPE USING AN OXYDABLE COATING
FR2544336A1 (en) * 1983-04-13 1984-10-19 Ziegler Sa INSTALLATION FOR CONTINUOUS TAPE COATING, ESPECIALLY FOR GALVANIZING STEEL SHEET
EP0122856A1 (en) * 1983-04-13 1984-10-24 Galvanor Ziegler Method and apparatus for the continuous coating of a strip with an oxidizable coating
EP0124408A1 (en) * 1983-04-13 1984-11-07 Ziegler S.A. Apparatus for the continuous coating of a strip, especially for galvanizing a steel sheet
US4502408A (en) * 1983-04-13 1985-03-05 Ziegler S.A. Installation for the continuous coating of a strip, especially for the galvanizing of sheet steel
US4612215A (en) * 1983-04-13 1986-09-16 Ziegler S.A. Process and installation for the continuous application of an oxidizable coating to a strip

Also Published As

Publication number Publication date
FR2507106B1 (en) 1986-07-11
FR2507106A1 (en) 1982-12-10

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