Gusset Bag, Spout-Attached Gusset Bag, And Method Of Manufacturing The Same

Abstract

The gusset bag includes an opposing pair of flat surface sections and an opposing pair of side surface sections folded inward. Moreover, the pair of flat surface sections and the pair of side surface sections includes a first film material that forms a first flat surface section and at least a first side surface section, and a second film material that forms the other section thereof Furthermore, a side edge seal section is formed in which a side edge section of the first film material and a side edge section of the second film material are sealed.

1 . A gusset bag comprising:
 an opposing pair of flat surface sections; and   an opposing pair of side surface sections folded inward,   wherein the pair of flat surface sections and the pair of side surface sections include a first film material that forms a first flat surface section and at least a first side surface section, and a second film material that forms the other section thereof, and   a side edge seal section is formed in which a side edge section of the first film material and a side edge section of the second film material are sealed.   
     
     
         2 . The gusset bag according to  claim 1 , wherein the first film material forms the first flat surface section and the pair of side surface sections, and the second film material forms a second flat surface section. 
     
     
         3 . A spout-attached gusset bag comprising a spout attached to the gusset bag according to  claim 1 . 
     
     
         4 . A spout-attached gusset bag comprising a spout attached to the gusset bag according to  claim 2 . 
     
     
         5 . A method of manufacturing a gusset bag, used to continuously manufacture the gusset bag according to  claim 2 , the method comprising:
 (α1) a step of conveying a long first film material used to form a first flat surface section and a pair of side surface sections, together with a long second film material used to form a second flat surface section, in a state in which the first film material is folded such that a plurality of first flat surface sections and a plurality of pairs of side surface sections are formed in parallel in a longitudinal direction thereof, and   welding a part between adjacent side surface sections of the first film material to the second film material in the longitudinal direction and cutting them, welding each part from side surface sections positioned near both side edges of the first film material to the side edges, to the second film material in the longitudinal direction and cutting them, and obtaining a plurality of cylindrical film materials, each cylindrical film material including flat surface sections and side surface sections with two side edge seal sections formed; and   (α2) a step of welding and cutting the cylindrical film material in a width direction thereof, and separating the cylindrical film material into a plurality in the longitudinal direction.   
     
     
         6 . A method of manufacturing a spout-attached gusset bag that uses the method of manufacturing a gusset bag according to  claim 5 , comprising attaching a spout to each top part of cylindrical film materials separated in the longitudinal direction when sealing the top part.