Bimetallic corrosion mitigation

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 77/20 (2006.01) B21D 51/44 (2006.01)

Patent

CA 2743225

A metal closure is described, in the form of a foil lid (1) bonded to a metal annular component (such as a container body or separate intermediate ring). The foil lid (1) and annular component are made of dissimilar metals, with the closure adapted to prevent bimetallic corrosion at the interface between the dissimilar metals of the foil lid and the annular component. The closure is adapted such that the lid comprises a peripheral wall which is upstanding from the annular component such that a gap is maintained between the annular component and an exposed metal peripheral edge of the lid. Further aspects of the invention include: i. a method for making such a metal closure; and ii. an apparatus for making such a metal closure.

L'invention porte sur un dispositif de fermeture en métal, sous la forme d'un opercule (1) collé à un composant annulaire en métal (tel qu'un corps de récipient ou un anneau intermédiaire séparé). L'opercule (1) et le composant annulaire sont constitués de métaux dissemblables, le dispositif de fermeture étant conçu pour empêcher la corrosion galvanique à l'interface entre les métaux dissemblables de l'opercule et du composant annulaire. Le dispositif de fermeture est conçu de façon à ce que l'opercule comprenne une paroi périphérique qui se prolonge vers le haut à partir du composant annulaire de façon à ce qu'un espace soit maintenu entre le composant annulaire et un bord périphérique en métal exposé de l'opercule. D'autres aspects de l'invention portent sur : i. un procédé pour la fabrication d'un tel dispositif de fermeture en métal; et ii. un appareil pour la fabrication d'un tel dispositif de fermeture en métal.

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