Patent ID: 8661772

Claim:
A method for sealing-in a gas in a bag with a gas filling compartment, said bag comprising an outer bag and an inner bag which is provided inside of the outer bag, wherein the inner bag has an opening along an upper edge thereof; films of the inner bag and films of the outer bag are sealed together, on each side of respective bags, along upper edges thereof, and further both lateral side edges and lower edges of the films of the inner bag and the films of the outer bag are sealed together, thus forming gas filling compartments between the films of the inner bag and the films of the outer bag; means for introducing gas in the gas filling compartments are formed in the respective films of the outer bag; and the films of the outer bag and the films of the inner bag are sealed together in the vicinity of said means for introducing gas, and sealed portions thereof surround peripheries of said means for introducing gas, leaving gas flow paths communicating to insides of said gas filling compartments; and said method comprising the steps of: placing a blow-out port of a nozzle, which is connected to a pressurized gas supply source, against said means for introducing gas and holding a back surface side of said bag with a backing member; blowing a gas from said nozzle into an inside of the gas filling compartment through said means for introducing gas; gripping and thus closing the gas flow path in the sealed portions surrounding a periphery of said means for introducing gas by a blocking gripper while the gas blow-in continues, thus cutting off a flow of gas between said means for introducing gas and an inside of the gas filling compartment; and sealing said means for introducing gas, thus allowing said gas to be sealed in the gas filling compartment.