Expandable container having lid for providing headspace control in a food can

A lid for cans for filling and keeping food or foodstuff therein, wherein after closing of the can body with said lid, the can is subjected to an atmosphere of a pasteurization or sterilization process as a temperature treatment, the lid comprising:

• an annular ring for seaming to an edge portion of the can body, providing firm and tight connection between can body and lid, the lid further having a lid panel affixed to the annular ring,
• wherein the annular ring for seaming to the can body comprises a flat web that is inclined upwards or outwards with respect to a horizontal plane at an angle of more than 10°, to which web the lid panel is sealingly affixed along a radially outer ring band;
• wherein the lid panel comprises of a material for hardening or stiffening by a deep-drawing deformation, at least as one layer;
• and
• wherein a central portion surrounded by the outer ring band has a first shape continuously bulged due to the deep-drawing process providing a shape keeping hardness or stability to still enable this central portion to:
• change into an outwardly shaped bulging under an inner pressure occurring during the temperature treatment inside the closed can, and
• upon reduction of said pressure to return this central portion to the first shape of continuous bulging.