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

摘要

The invention suggests a peelable cover panel for a lid of peel type which allows a safe sterilization of filled and closed cans in continuous autoclaves (high temperature prevailing there and a resultant high pressure in the can) avoiding risk of breaking, breaking up or detaching said plane (surface oriented) cover panel on or from the seamable annular ring. After the cooling of the can, the lid also has an acceptable appearance. Suggested therefore is a cover panel for sealing to an annular ring to provide a lid to close a can body and allow a thermally treating pasteurization or sterilization process of the closed can in a continuous autoclave. The cover panel (3) having a radially outer ring band (3a) for sealingly affixing to a flat web (6) and a remaining central portion (3b) that is surrounded by the ring band, the control portion being preformed in a bowl-shaped fashion and is for this reason stabilized. The stabilization is such that the bowl-shaped cover panel (3), during an increase in pressure during at least the pasteurization, changes from the preformed bowl-shape as first position (3b) to a second position (3b') that is bowl-shaped axially outwards, and is still able to return to the first position (3b), at least substantially during or after cooling.