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Peel-off rings are an alternative to conventional easy-open ends. Varnished rings are closed with a thermo-seal foil.
The most demanding operation is the curling of the ring. A steel type which bonds well with lacquer is required.
Steel grades frequently used: TH330, TH415, and TS275.
Metallic coating: Tin coating or ECCS. ECCS can be used when the can’s contents are not aggressive. ECCS also assists lacquer adhesion.