Gusset bag and method of producing the same

Abstract

A gusset bag having side films folded inwardly and an opening portion at the upper edge of the bag, said gusset bag further having a reinforcing resin layer at least on the side edge.

1 . A gusset bag having side films folded inwardly and an opening portion at the upper edge of the bag, said gusset bag further having a reinforcing resin layer at least on the side edge.  
   
   
       2 . The gusset bag of  claim 1  wherein the reinforcing resin layer is further provided on the upper edge.  
   
   
       3 . The gusset bag of  claim 2  wherein a spout is provided at the opening portion with bonding to the reinforcing resin layer.  
   
   
       4 . The gusset bag of  claim 3  wherein the reinforcing resin layer and the spout are integrally molded.  
   
   
       5 . A method for producing a gusset bag having side films folded inwardly and an opening portion at the upper edge of the bag comprising: 
 injecting a resin to the side edge of the gusset bag or the side edge and the upper edge of the gusset bag to form a reinforcing resin layer.    
   
   
       6 . The method of producing the gusset bag of  claim 5  wherein the spout is formed at the opening portion and the reinforcing resin layer is formed integrally with the spout by injecting the resin.