Bag with a gas filling compartment, method for manufacturing the same, method for sealing gas in the same and method for packaging the same

Abstract

A bag made of an outer bag 3 and an inner bag 2 . The inner bag, inside the outer bag, has an opening in the upper edge, and the inner and outer bags are sealed along the upper edges, on either side of the respective bags, to form sealed portions 8 and 9 , and the inner bag and outer bag are further sealed together at two lateral side edges and lower edge to form sealed portions 11 and 12 and sealed portion 13 , thus forming gas filling compartments 14 and 15 . Cut-ins 18 and 19 are formed in the upper comers of the outer bag, and supplemental sealed portions 16 and 17 connected to the sealed portions 8 and 9 are formed. Air (gas) is blown into the gas filling compartments 14 and 15 through the cut-ins and then the overall bag mouth including the cut-ins is sealed.

1 . A bag with a gas filling compartment 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.    
   
   
       2 . The bag with a gas filling compartment according to claim I, wherein 
 a supplemental sealed portion is formed by sealing the films of the outer bag and the films of the inner bag; and    said supplemental sealed portion and an upper edge sealed portion and/or one of lateral side edge sealed portions form said sealed portions that surround the periphery of said means for introducing gas.    
   
   
       3 . The bag with a gas filling compartment according to  claim 2 , wherein said supplemental sealed portion is formed to be continuous to the upper edge sealed portion and/or one of the lateral side edge sealed portions.  
   
   
       4 . The bag with a gas filling compartment according to  claim 1 , wherein said means for introducing gas are formed respectively in the films of the outer bag so as to be located in the vicinity of upper edge side comers on mutually opposite lateral side edges.  
   
   
       5 . The bag with a gas filling compartment according to  claim 2 , wherein said supplemental sealed portions are formed in said bag by mutually sealing a part of the films of the outer bag and a part of the films of the inner bag on each side of respective bags.  
   
   
       6 . The bag with a gas filling compartment according to  claim 5 , wherein said means for introducing gas are formed respectively in the films of the outer bag so as to be located in the vicinity of upper edge side comers on mutually opposite lateral side edges.  
   
   
       7 . A bag with a gas filling compartment comprising an outer bag and an inner bag which is provided inside of and is smaller in width than 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, the films of the inner bag and the films of the outer bags are sealed together along lower edges thereof, and further the films of the outer bag are sealed together at upper and lower edges thereof on both lateral sides of the inner bag and along both lateral side edges thereof, thus forming a gas filling compartment between the films of the inner bag and outer bag;    a means for introducing gas is formed in at least one side of the outer bag; and    the films of the outer bag are sealed together in the vicinity of said means for introducing gas, and sealed portions thereof surround a periphery of said means for introducing gas, leaving a gas flow path communicating to inside of said gas filling compartment.    
   
   
       8 . The bag with a gas filling compartment according to  claim 7 , wherein 
 a supplemental sealed portion is formed by sealing a part of the films of the outer bag; and    said supplemental sealed portion and one of upper edge sealed portions formed by films of the outer bag and/or one of lateral side edge sealed portions of the outer bag form said sealed portions that surround the periphery of said means for introducing gas.    
   
   
       9 . The bag with a gas filling compartment according to  claim 8 , wherein said supplemental sealed portion is formed so as to be continuous to upper edge sealed portion or one of the lateral side edge sealed portions.  
   
   
       10 . The bag with a gas filling compartment according to  claim 7 , wherein said means for introducing gas formed in the films of the outer bag are located in the vicinity of upper edge side comers.  
   
   
       11 . A method for manufacturing a bag with a gas filling compartment, said method being for manufacturing the bag according to  claim 5  or  6  and comprising the steps of: 
 unwinding and paying out, from two rolls on each of which tube film is wound, tube films folded together in a two-ply stacked condition;    forming, for each of the folded-together tube films, a means for introducing gas in films that are to be made into the films of the outer bag;    sealing, for each of the tube films, films that are to be the films of the outer bag and films that are to be films of the inner bag, together, thus forming an upper edge sealed portion and a supplemental sealed portion;    stacking two tube films together; then    sealing two tube films together to form two lateral side edge sealed portions and a lower edge sealed portion, thus producing a bag with a gas filling compartment; and then    cutting the bag with a gas filling compartment away from end of the films.    
   
   
       12 . The method for manufacturing a bag with a gas filling compartment according to  claim 11 , further comprising the steps of: 
 continuously cutting, at a prescribed position, one edge of each of the tube films folded together and paid out,    setting a backing member inside the tube films from a downstream side of said cutting position; and    advancing and retracting a punch disposed outside the tube films to said backing member, thus forming said means for introducing gas.    
   
   
       13 . A method for manufacturing a bag with a gas filling compartment, said method being for manufacturing the bag according to  claim 5  or  6  and comprising the steps of: 
 unwinding and paying out films from two rolls on each of which film is wound;    folding the unwound and paid out films double in a longitudinal direction thereof;    forming, for each of the double-folded films, means for introducing gas in films that are to be made into the films of the outer bag;    sealing together, for each of the double-folded films, one side thereof that is to be the films of the outer bag and one side thereof that is to be the films of the inner bag, thus forming an upper edge sealed portion and a supplemental sealed portion;    stacking together two double-folded films;    sealing together the two double-folded films to form lateral side edge sealed portions and lower edge sealed portion, thus producing a bag with a gas filling compartment; and then    cutting the bag with a gas filling compartment away from end of the films.    
   
   
       14 . A method for manufacturing a bag with a gas filling compartment, said method being for manufacturing the bag according to  claim 5  or  6  and comprising the steps of: 
 unwinding and paying out films from two rolls on each of which film is wound;    forming a means for introducing gas at two locations in one of unwound and paid-out two films;    stacking together the two films;    folding the two films double in a longitudinal direction thereof so that said one film is on an outer side and another film is on an inner side, thus making a four-ply stack;    sealing together, on an opening side of the four-ply stacked films, an outer surface film and an inner surface film on each side of the respective four-ply stacked films;    then sealing together the four-ply stacked films to form two lateral side edge sealed portions and a lower edge sealed portion, thus producing a bag with a gas filling compartment; and then    cutting the bag with a gas filling compartment away from end of the films.    
   
   
       15 . A method for manufacturing a bag with a gas filling compartment, said method being for manufacturing the bag according to  claim 5  or  6  and comprising the steps of: 
 unwinding and paying out films from two rolls on each of which film is wound;    forming a means for introducing gas at two locations in one of unwound and paid-out two films;    stacking together the two films; then    sealing together the two films to form an upper edge sealed portion and a supplemental sealed portion at two locations; then    folding the two films double in a longitudinal direction thereof so that said one film is on an outer side and another film is on an inner side, thus making a four-ply stack; then    sealing together the four-ply stacked films to form two lateral side edge sealed portions and a lower edge sealed portion, thus producing a bag with a gas filling compartment; and then    cutting the bag with a gas filling compartment away from end of the films.    
   
   
       16 . The method for manufacturing a bag with a gas filling compartment according to  claim 14 , said method further comprising the steps of: 
 providing a hot plate backing plate between inner films of the four-ply stacked films; and    pressure-holding films on an outer side and an inner side together on each side of the respective four-ply stacked films by a pair of hot plates and said hot plate backing member, thus forming the upper edge sealed portion and the supplemental sealed portion.    
   
   
       17 . A method for sealing-in a gas in a bag with a gas filling compartment, said method using the bag with a gas filling compartment according to any one of  claims 1  to  10  and 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.    
   
   
       18 . The method for sealing-in a gas in a bag with a gas filling compartment according to  claim 17 , wherein said sealing of said means for introducing gas is effected by sealing two surfaces of said bag at location of said means for introducing gas.  
   
   
       19 . A method for sealing-in a gas in a bag with a gas filling compartment, said method using the bag with a gas filling compartment according to  claim 4 ,  6  or  10  and 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 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 bag mouth of said bag from both surfaces and said means for introducing gas, thus allowing said gas to be sealed in the gas filling compartment.    
   
   
       20 . A method for packaging a bag with a gas filling compartment wherein bags, held at both lateral side edges thereof by grippers and suspended, are conveyed, and, during a course of said conveyance, various packaging processes including bag mouth opening, filling said bag with contents to be packaged, and bag mouth sealing are successively performed, wherein 
 said method uses the bag with a gas filling compartment according to  claim 4 ,  6 , or  10 , as said bag, and    a process for sealing gas in the gas filling compartment of said bag is executed after a process for filling an inner bag with contents to be packaged; and    said process for sealing gas comprises 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 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 the bag mouth of said bag from both surfaces of said bag, at which time said means for introducing gas is sealed together therewith, thus sealing the gas inside the gas filling compartment.