Producing foil bag for keeping food fresh involves stamping double layered foil to make opening(s), closing opening(s) in first layer with valve seal, closing opening(s) in opposing second layer with foil section and/or second valve seal

摘要

The method involves stamping a double layered foil material to produce at least one opening, closing at least one opening with a valve seal (9) on a first layer of the foil and closing at least one further opening with a foil section and/or a second valve seal on an opposing second foil layer. An independent claim is also included for a foil bag.