Method for forming a lid and such seamable lid itself

A seamable lid comprising:

• a lid ring extending radially outside in a curl shape adapted to be seamed to a body flange of a container body, and extending radially inside in a substantially flat flange, adapted to be sealed and sealed with an outer ring of a central foil, covering an inner opening of the lid ring radially inside of an inner end of the flat flange;
• the central foil having a tab extending from a radially outer end of the central foil radially inward, preferably folded radially inside, and lying substantially parallel and close to an upper surface of the central foil along a main extension of the tab length;
• three radially extending portions comprising the tab, comprising an outer portion, an inner portion, and an intermediate portion,
• the inner portion rising axially upward, during a press or squeeze operation acted on the intermediate portion between the inner and outer portions, forcing the inner portion away from an upper surface of the foil at an angle between 10° to 45°, and at a length smaller than one third of a length associated with the tab, keeping the outer portion substantially parallel to the foil.