Method and device for melt dip coating metal strips,...

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 2/24 (2006.01)

Patent

CA 2517319

The invention relates to a method for melt dip coating a metal strip (1), especially a steel strip (1a), which is guided through a coating station (4). The metal strip (1) is coated with a coating metal (3), the metal strip (1) is centrally maintained in a guide channel (8) in an electromagnetic sealing field (13) which seals the guide channel (8) from below and guides the metal strip (1) laterally, counter to ferromagnetic attraction, through a corrector field (14). The sealing field (13) is embodied as an electromagnetic guiding field (10), as a blocking field (11) or as a pump field (12) in order to select adequate lateral sealing when any particular sealing field (13) is used. Several corrector fields (14) are arranged in a distributed manner in a selected configuration, whereby the position and number thereof are determined individually at least according to the various widths of the metal strip (1).

Procédé de galvanisation d'une bande métallique (1), en particulier d'une bande d'acier (1a), qui est guidée à travers un poste de galvanisation (4) dans lequel la bande métallique (1) est recouverte de métal de galvanisation (3). La bande métallique (1) est maintenue au milieu d'un canal de guidage (8) dans un champ d'étanchéification magnétique (13) qui étanchéifie le canal de guidage (8) vers le bas et est guidée latéralement contre l'attraction ferromagnétique, à travers un champ de correction (14). Selon la présente invention, pour sélectionner de manière appropriée une étanchéification latérale, des champs d'étanchéification (13) quelconques étant utilisés, le champ d'étanchéification (13) se présente sous forme de champ électromagnétique d'ondes progressives (10), de champ de blocage (11) ou de champ de pompage (12) et plusieurs champs de correction (14) sont répartis dans une configuration sélectionnée, la position et le nombre de ces champs étant fixés individuellement, au moins selon différentes largeurs de la bande métallique (1).

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