Side-gusseted pouch

Abstract

Provided is a side-gusseted pouch that reduces occurrence of delamination in the vicinity of a lower end coupling portion of a side gusset film. A side-gusseted pouch in which in at least one of side gusset films on right and left sides, a lower side inclined edge portion includes a folding guide portion and a lower end side connecting portion that connects a lower end of the folding guide portion and a lower end coupling portion, and the lower end side connecting portion connects the lower end of the folding guide portion and the lower end coupling portion such that the lower end coupling portion is located below a first imaginary intersection point at which a central imaginary line passing through an upper end coupling portion and the lower end coupling portion intersects a folding imaginary line defined by the folding guide portion.

1 . A side-gusseted pouch, comprising:
 a front side film;   a rear side film; and   side gusset films on both right and left sides disposed between the front side film and the rear side film and to be heat-sealed to the front side film and the rear side film by a side seal, wherein   the side gusset films each include   a front side sealing region to be heat-sealed to the front side film at the side seal,   a rear side sealing region to be heat-sealed to the rear side film at the side seal, and   a non-sealing region that is a region inside the front side sealing region and the rear side sealing region,   the non-sealing region includes   a front side outer edge that is a boundary with the front side sealing region and   a rear side outer edge that is a boundary with the rear side sealing region,   the front side outer edge and the rear side outer edge each include   a base edge portion, the base edge portion of the front side outer edge and the base edge portion of the rear side outer edge being disposed spaced apart from each other in a front-rear direction,   an upper side inclined edge portion extending from an upper end of the base edge portion to an upper end coupling portion coupling upper ends of the front side outer edge and the rear side outer edge, and   a lower side inclined edge portion extending from a lower end of the base edge portion to a lower end coupling portion coupling lower ends of the front side outer edge and the rear side outer edge,   in at least one of the side gusset films on right and left sides, the lower side inclined edge portion includes   a folding guide portion that guides folding of each of the side gusset films when a liquid contents accommodating portion is filled with liquid contents and   a lower end side connecting portion that connects a lower end of the folding guide portion and the lower end coupling portion, and   the lower end side connecting portion connects the lower end of the folding guide portion and the lower end coupling portion such that the lower end coupling portion is located below a first imaginary intersection point at which a central imaginary line passing through the upper end coupling portion and the lower end coupling portion intersects a folding imaginary line defined by the folding guide portion.   
     
     
         2 . The side-gusseted pouch according to  claim 1 , wherein the folding guide portion is formed as a linear portion that is inclined closer to a side of the central imaginary line toward a lower side. 
     
     
         3 . The side-gusseted pouch according to  claim 1 , wherein the folding guide portion is formed continuous with the lower end of the base edge portion. 
     
     
         4 . The side-gusseted pouch according to  claim 1 , wherein the lower end side connecting portion is formed as a curved portion which is convex toward a side of the central imaginary line. 
     
     
         5 . The side-gusseted pouch according to  claim 1 , wherein
 a vertical distance between a second imaginary intersection point at which the folding imaginary line intersects the base edge portion and the first imaginary intersection point is defined as H1,   a vertical distance between the first imaginary intersection point and the lower end coupling portion is defined as H2, and   the lower end side connecting portion is formed with H2/H1 of 0.1 or greater.   
     
     
         6 . The side-gusseted pouch according to  claim 1 , wherein the side gusset films each include a central folded portion obtained by folding each of the side gusset films in a convex shape toward a pouch inner side along the central imaginary line. 
     
     
         7 . The side-gusseted pouch according to  claim 1 , further comprising
 a spout to be attached to a side gusset film of the side gusset films, wherein the spout is attached to a region other than a region between the lower side inclined edge portion of the front side outer edge and the lower side inclined edge portion of the rear side outer edge in the side gusset film.   
     
     
         8 . The side-gusseted pouch according to  claim 1 , wherein the lower end coupling portion is a portion located at a pouch bottom portion in a state in which the liquid contents accommodating portion is filled with liquid contents and a pouch main body is inflated. 
     
     
         9 . The side-gusseted pouch according to  claim 1 , further comprising
 a bottom seal formed continuous with the side seal on both right and left sides at a pouch bottom portion, wherein   the bottom seal includes a folding control sealing portion located above both right and left end portions thereof.   
     
     
         10 . The side-gusseted pouch according to  claim 9 , wherein
 both the side gusset films on right and left sides include the lower end side connecting portion, and   the folding control sealing portion is formed such that in a state in which the side-gusseted pouch is folded with inner surfaces of the front side film and the rear side film contacting each other, a portion located on an uppermost side of an upper end edge of the folding control sealing portion contacts an imaginary line connecting the first imaginary intersection point on a right side and the first imaginary intersection point on a left side in a right-left direction.   
     
     
         11 . The side-gusseted pouch according to  claim 9 , wherein a portion located on an uppermost side of an upper end edge of the folding control sealing portion extends linearly along a right-left direction. 
     
     
         12 . The side-gusseted pouch according to  claim 9 , wherein a lower unsealed portion is formed below the folding control sealing portion. 
     
     
         13 . A side-gusseted pouch, comprising:
 a front side film;   a rear side film; and   side gusset films on both right and left sides disposed between the front side film and the rear side film and to be heat-sealed to the front side film and the rear side film by a side seal, wherein   the side gusset films each includes   a front side sealing region to be heat-sealed to the front side film at the side seal,   a rear side sealing region to be heat-sealed to the rear side film at the side seal, and   a non-sealing region that is a region inside the front side sealing region and the rear side sealing region,   the non-sealing region includes   a front side outer edge that is a boundary with the front side sealing region and   a rear side outer edge that is a boundary with the rear side sealing region,   the front side outer edge and the rear side outer edge each include   a base edge portion, the base edge portion of the front side outer edge and the base edge portion of the rear side outer edge being disposed spaced apart from each other in a front-rear direction,   an upper side inclined edge portion extending from an upper end of the base edge portion to an upper end coupling portion coupling upper ends of the front side outer edge and the rear side outer edge, and   a lower side inclined edge portion extending from a lower end of the base edge portion to a lower end coupling portion coupling lower ends of the front side outer edge and the rear side outer edge,   in at least one of the side gusset films on right and left sides, the upper side inclined edge portion includes   a folding guide portion that guides folding of each of the side gusset films when a liquid contents accommodating portion is filled with liquid contents and   an upper end side connecting portion that connects an upper end of the folding guide portion and the upper end coupling portion, and   the upper end side connecting portion connects the upper end of the folding guide portion and the upper end coupling portion such that the upper end coupling portion is located above a third imaginary intersection point at which a central imaginary line passing through the upper end coupling portion and the lower end coupling portion intersects a folding imaginary line defined by the folding guide portion.