Packaging bag

Abstract

A packaging bag has a bag body. A body shaping member is disposed inside the bag body to maintain the packaging bag so as to provide a hexahedron shape. The bottom surface portion of the packaging bag is formed from a film material which is overlapped several times for applying strength and rigidity. The bottom surface portion includes: a lower end seal portion formed by sealing a portion of a lower extending portion; a triangular folded portion surrounded by a reference line and oblique lines, in which a portion of the lower extending portion extending downward from the side surface portion is folded toward a center side of the packaging bag with the reference line corresponding to the lower end of the shaping member, and a reference point corresponding to the lower edge of the lower sealing portion at the central portion in the longitudinal direction of the packaging bag and an apex point corresponding to the lower end of the shaping member at the longitudinal end edges of the extending portion from the side surface portion are connected and folded so as to provide inward a protrude portion; and a flat surface folding portion in which, at the lower extending portion, the lower end of the shaping member extending from the flat surface portion is folded centrally of the packaging bag as a reference line so as to accord with the triangular folding portion.

1 . A packaging bag comprising: 
 a bag body formed from a sheet of rectangular film material;    a shaping member for keeping the shape of the bag body so as to provide a hexahedron shape having a pair of opposing flat surface portions, a pair of side surface portions positioned on the both sides of the flat surface portions, an upper surface portion and a bottom surface portion opposing to the upper surface portion; and    a fastener attached to the upper surface portion to be re-sealable after being once opened,    the shaping member having flat surface forming portions corresponding to the flat surface portions of the bag body and side surface forming portions corresponding to the side surface portions of the bag body which are positioned alternately adjacently, the flat surface forming portions and the side surface forming portions being folded along folding lines disposed in parallel with each other, and both ends forming end edges of the flat surface forming portions of the shaping member and end edges of the side surface forming portions being abutted against each other,    wherein the bag body is formed such that the shaping member is disposed inside, inner surfaces of both the side edges of the film material are bonded with a constant bonding width portion while the shaping member being folded along the folding lines so as to form a tubular member with an upper extending portion extending over the upper end of the shaping member and a lower extending portion extending over the lower end thereof, the flat surface portions and the side surface portions are formed by arranging the film material along the flat surface forming portions and the side surface forming portions of the shaping member, the upper extending portion of the tubular body is folded to form the upper surface portion and the lower extending portion of the tubular body is folded to form the bottom surface portion,    a vertical sealing portion formed by bonding side edges of the film material together, at the time of forming the tubular body, so as to extend vertically on one side of the flat surface portion of the packaging bag,    the bottom surface portion includes: a lower end seal portion formed by sealing a portion of the lower extending portion having a constant width from the lower end thereof; a triangular folded portion surrounded by a reference line and oblique lines, in which a portion of the lower extending portion extending downward from the side surface portion is folded toward a center side of the packaging bag with the reference line corresponding to the lower end of the shaping member, and a reference point corresponding to the lower edge of the lower sealing portion at the central portion in the longitudinal direction of the packaging bag and an apex point corresponding to the lower end of the shaping member at the longitudinal end edges of the extending portion from the side surface portion are connected and folded so as to provide inward a protrude portion; and a flat surface folding portion, in which at the lower extending portion, the lower end of the shaping member extending from the flat surface portion is folded centrally of the packaging bag as a reference line so as to accord with the triangular folded portion, and    the lower sealing portion includes: a central sealing portion formed by sealing the inner surfaces of portions corresponding to the reference points at the extending portion from the flat surface portion; and a side sealing portion formed by sealing the inner surfaces of portions extending from the side surfaces, the side sealing portion being sealed with respectively opposing portions in the longitudinal direction.    
     
     
         2 . The packaging bag according to  claim 1 , wherein the upper surface portion includes: a flat surface folding portion formed by folding the portion of the upper extending portion extending upward from the flat surface portion centrally with the upper end of the shaping member being the reference line; a triangular extending portion formed by folding so that the extending portions extending upward from the side surface portions so as to laterally protrude in form of triangle with the upper end of the shaping member being the reference line; an overlap portion by overlapping the inner surfaces mutually opposing at the time of folding the upper extending portion at the central portion in the longitudinal direction of the packaging bag above the flat surface folding portion and the triangular extending portion; and an upper seal portion sealing the upper end edge of the overlap portion, wherein the overlap portion is folded back on the back surface side of the packaging bag, and the triangular extending portion is formed to be flat by being folded back so as to be overlapped with the outer surfaces of the corresponding side surfaces.  
     
     
         3 . The packaging bag according to  claim 1 , wherein the vertical sealing portion is disposed on the back surface side of the packaging bag so as to be along one side end edge of the back side surface.  
     
     
         4 . The packaging bag according to  claim 2 , wherein the vertical sealing portion is disposed on the back surface side of the packaging bag so as to be along one side end edge of the back side surface.  
     
     
         5 . The packaging bag according to  claim 1 , wherein the shaping member is formed with a bottom surface forming portion extending from the lower ends of the flat surface portions and being foldable with respect to the flat surface forming portions of the shaping member.  
     
     
         6 . The packaging bag according to  claim 2 , wherein the shaping member is formed with a bottom surface forming portion extending from the lower ends of the flat surface portions and being foldable with respect to the flat surface forming portions of the shaping member.  
     
     
         7 . The packaging bag according to  claim 3 , wherein the shaping member is formed with a bottom surface forming portion extending from the lower ends of the flat surface portions and being foldable with respect to the flat surface forming portions of the shaping member.  
     
     
         8 . The packaging bag according to  claim 4 , wherein the shaping member is formed with a bottom surface forming portion extending from the lower ends of the flat surface portions and being foldable with respect to the flat surface forming portions of the shaping member.