Patent Publication Number: US-11655089-B2

Title: Spout-equipped packaging bag and manufacturing method therefor, and spout-equipped packaging bag that contains contents

Description:
TECHNICAL FIELD 
     The present invention relates to a spout-equipped packaging bag and a manufacturing method therefor, and a spout-equipped packaging bag that contains contents. 
     Priority is claimed on Japanese Patent Application No. 2017-122284, filed Jun. 22, 2017, the content of which is incorporated herein by reference. 
     BACKGROUND ART 
     As packaging bags for accommodating beverages, seasonings, and refilled liquids such as shampoo, self-standing spout-equipped packaging bags in which a spout is attached to a bag body are known. Generally, in spout-equipped packaging bags having self-standing properties, there are many cases where a spout is liquid-tightly attached to an upper portion of a bag body including a pair of flat surface portions such that the spout is interposed between the flat surface portions, and the upper portion of this bag body has a narrowed shape. However, in such spout-equipped packaging bags, when the amount of contents decreases, the upper portion of the bag body is likely to be bent due to the weight of the spout, and therefore it is difficult to ensure sufficient self-standing properties. 
     A spout-equipped packaging bag in which a spout is attached to a bottom portion of the bag body has also been proposed (Patent Document 1). Since the spout is provided in the bottom portion, this spout-equipped packaging bag exhibits excellent self-standing properties even if the amount of contents decreases. However, since the spout opens downward, a cap may unintentionally become undone, or contents may leak out when the cap is loosely fastened. 
     In addition, a spout-equipped packaging bag including a bag body which includes a pair of side walls and two gusset portions respectively connecting upper ends of the side walls to each other and lower ends thereof to each other and in which the gusset portions form a top surface portion and a bottom surface portion; and a spout in which a flange portion projects from an outer surface of a nozzle portion has been proposed (Patent Document 2). In the spout-equipped packaging bag, the flange portion is adhered and fixed to the top surface portion of the bag body. In this spout-equipped packaging bag, since the spout is attached to an upper portion of the bag body, even if a cap unintentionally becomes undone or the cap is loosely fastened, contents am unlikely to leak out. In addition, since the top surface portion and the bottom surface portion have a spreading shape, even if the amount of contents decreases, self-standing properties can be easily ensured. 
     However, in this spout-equipped packaging bag, in order to join the top surface portion and the side walls to each other, an annular seal portion protruding upward is formed throughout the entire circumference of the gusset portion forming the top surface portion. Therefore, for example, when a beverage or the like is stored therein and a user drinks the beverage or the like through the spout, there are cases where this seal portion comes into contact with the face and causes discomfort. In addition, on a side end side of the bag body, the top surface portion is sealed to each of the pair of side walls, and the side walls are sealed together on a side below the top surface portion. Therefore, the seal portion is formed into a Y-shape in side view. Since an intersection part in the Y-shape of this seal portion is particularly hard, when the bag body is held with the hand, if the hand touches this intersection part, significant discomfort is caused. 
     CITATION LIST 
     Patent Document 
     [Patent Document 1] 
     Japanese Unexamined Patent Application, First Publication No. H07-41010 
     [Patent Document 2] 
     Japanese Unexamined Patent Application, First Publication No. 2016-3055 
     SUMMARY OF INVENTION 
     Technical Problem 
     An object of the present invention to provide a spout-equipped packaging bag in which sufficient self-standing properties can be ensured even when the amount of contents decreases and discomfort when in use is reduced, a manufacturing method therefor, and a spout-equipped packaging bag that contains contents. 
     Solution to Problem 
     The present invention has the following constitutions. 
     [1] A self-standing spout-equipped packaging bag is provided, including a bag body that stores contents, and a spout that is attached to an upper portion of the bag body. The bag body includes a tubular barrel portion, and a bottom portion which is attached to block an opening end of a lower part of the barrel portion. The spout includes a tubular nozzle portion, and a flange portion which projects from an outer surface of the nozzle portion. An upper end part of the tubular barrel portion over an entire circumference is liquid-tightly adhered to an upper surface of the flange portion in a state of following a shape of the flange portion in plan view to be in the same shape. 
     [2] In the spout-equipped packaging bag according to [1], the upper end part of the barrel portion is folded on the upper surface of the flange portion and is adhered to the upper surface in a state of following the shape of the flange portion in plan view to be in the same shape. 
     [3] In the spout-equipped packaging bag according to [1] or [2], the shape of the flange portion in plan view is substantially a polygonal shape, and the upper end part of the barrel portion is bent along each of sides of the flange portion and is adhered to the upper surface of the flange portion. 
     [4] In the spout-equipped packaging bag according to any one of [1] to [3], the barrel portion has a tubular shape with no side seal portion which projects outward in plan view. 
     [5] In the spout-equipped packaging bag according to any one of [1] to [4], the bottom portion folded in half is positioned inside of the barrel portion while having a bend line thereof on an upper side, each of side ends of the bottom portion is adhered to an inner surface of the barrel portion by means of an adhesive film, and the barrel portion and the bottom portion are adhered to each other throughout the entire circumference of the barrel portion of a lower part of the barrel portion. 
     [6] In a spout-equipped packaging bag that contains contents, the contents are stored inside of the bag body of the spout-equipped packaging bag according to any one of [1] to [5]. 
     [7] A manufacturing method is provided for a self-standing spout-equipped packaging bag, including a bag body that stores contents, and a spout that is attached to an upper portion of the bag body. The bag body includes a tubular barrel portion, and a bottom portion which is attached to block an opening end of a lower part of the barrel portion. The spout includes a tubular nozzle portion, and a flange portion which protrudes from an outer surface of the nozzle portion. An upper end part of the tubular barrel portion over an entire circumference is folded on an upper surface of the flange portion and is liquid-tightly adhered to the upper surface in a state of following a shape of the flange portion in plan view to be in the same shape. 
     [8] In the manufacturing method for a spout-equipped packaging bag according to [7], the shape of the flange portion in plan view is substantially a polygonal shape. The entire upper end part of the barrel portion is liquid-tightly adhered to the upper surface of the flange portion by repeating an operation in which a portion of the upper end part of the barrel portion is bent along one side of the flange portion and is adhered to the upper surface of the flange portion. 
     [9] In the manufacturing method for a spout-equipped packaging bag according to [8], after respective parts of the upper end part of the barrel portion are bent along every other side of a plurality of sides of the flange portion and are adhered to the upper surface of the flange portion, remaining parts of the upper end part of the barrel portion are bent along remaining sides of the flange portion and are adhered to the upper surface of the flange portion. 
     [10] In the manufacturing method for a spout-equipped packaging bag according to [8], after a portion of the upper end part of the barrel portion is bent along one side of the plurality of sides of the flange portion and is adhered to the upper surface of the flange portion, respective parts of the upper end part of the barrel portion are bent along respective sides of the flange portion and are adhered to the upper surface of the flange portion in a sequential order of moving round in one direction in plan view. 
     [11] In the manufacturing method for a spout-equipped packaging bag according to [8], after a portion of the upper end part of the barrel portion is bent along one side of the plurality of sides of the flange portion and is adhered to the upper surface of the flange portion, respective parts of the upper end part of the barrel portion are bent along respective sides of the flange portion and are adhered to the upper surface of the flange portion in order of moving halfway round respectively in both directions in plan view. 
     Effects of Invention 
     In the spout-equipped packaging bag and the spout-equipped packaging bag that contains contents of the present invention, since the upper end part of the tubular barrel portion of the bag body is in a state of following the shape of the flange portion in plan view to be in the same shape and does not have a narrowed shape, sufficient self-standing properties can be ensured even when the amount of contents decreases and discomfort when in use is reduced. 
     According to the manufacturing method for a spout-equipped packaging bag of the present invention, it is possible to obtain a spout-equipped packaging bag in which sufficient self-standing properties can be ensured even when the amount of contents decreases and discomfort when in use is reduced. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a perspective view illustrating an example of a spout-equipped packaging bag of the present invention. 
         FIG.  2 A  is a view illustrating a spout of the spout-equipped packaging bag in  FIG.  1    and is a perspective view. 
         FIG.  2 B  is a view illustrating the spout of the spout-equipped packaging bag in  FIG.  1    and is a cross-sectional view of A-A in  FIG.  2 A . 
         FIG.  3    is an enlarged front view of a part of a bag body on a bottom portion side in the spout-equipped packaging bag of the present invention. 
         FIG.  4 A  is a view illustrating one manufacturing step for the spout-equipped packaging bag of the present invention and is a perspective view of a bottom member and an adhesive film. 
         FIG.  4 B  is a view illustrating one manufacturing step for the spout-equipped packaging bag of the present invention and is a plan view of the deployed spout-equipped packaging bag. 
         FIG.  5 A  is a cross-sectional view illustrating an example of an embodiment of a back joint in the spout-equipped packaging bag of the present invention. 
         FIG.  5 B  is a cross-sectional view illustrating another example of the embodiment of the back joint in the spout-equipped packaging bag of the present invention. 
         FIG.  5 C  is a cross-sectional view illustrating another example of the embodiment of the back joint in the spout-equipped packaging bag of the present invention. 
         FIG.  6 A  is a cross-sectional view taken along I-I of the spout-equipped packaging bag in  FIG.  3   . 
         FIG.  6 B  is a cross-sectional view taken along II-II of the spout-equipped packaging bag in  FIG.  3   . 
         FIG.  7    is a perspective view partially illustrating another form in a state where contents are stored in the spout-equipped packaging bag of the present invention. 
         FIG.  8    is a view illustrating one manufacturing step for the spout-equipped packaging bag of the present invention and is a front view of the bag body before the spout is attached. 
         FIG.  9    is a view illustrating one manufacturing step for the spout-equipped packaging bag of the present invention and is a rear view of the bag body before the spout is attached. 
         FIG.  10 A  is an example of one manufacturing step and is a perspective view illustrating a situation in which an upper end part of a tubular barrel portion over the entire circumference is folded and is adhered to an upper surface of a flange portion of the spout. 
         FIG.  10 B  is the example of one manufacturing step and is a perspective view illustrating a situation in which the upper end part of the tubular barrel portion over the entire circumference is folded and is adhered to the upper surface of the flange portion of the spout. 
         FIG.  11 A  is the example of one manufacturing step and is a perspective view illustrating a situation in which the upper end part of the tubular barrel portion over the entire circumference is folded and is adhered to the upper surface of the flange portion of the spout. 
         FIG.  11 B  is the example of one manufacturing step and is a perspective view illustrating a situation in which the upper end part of the tubular barrel portion over the entire circumference is folded and is adhered to the upper surface of the flange portion of the spout. 
         FIG.  11 C  is the example of one manufacturing step and is a perspective view illustrating a situation in which the upper end part of the tubular barrel portion over the entire circumference is folded and is adhered to the upper surface of the flange portion of the spout. 
         FIG.  12 A  is the example of one manufacturing step and is a perspective view illustrating a situation in which the upper end part of the tubular barrel portion over the entire circumference is folded and is adhered to the upper surface of the flange portion of the spout. 
         FIG.  12 B  is the example of one manufacturing step and is a perspective view illustrating a situation in which the upper end part of the tubular barrel portion over the entire circumference is folded and is adhered to the upper surface of the flange portion of the spout. 
         FIG.  13    is a plan view illustrating one manufacturing step in another example of the spout-equipped packaging bag of the present invention. 
         FIG.  14    is a plan view illustrating one manufacturing step in another example of the spout-equipped packaging bag of the present invention. 
         FIG.  15    is a cross-sectional view illustrating a barrel portion in another example of the spout-equipped packaging bag of the present invention. 
         FIG.  16    is a view illustrating another manufacturing step for the spout-equipped packaging bag of the present invention and is a front view of the bag body before the spout is attached. 
         FIG.  17    is a view illustrating another manufacturing step for the spout-equipped packaging bag of the present invention and is a rear view of the bag body before the spout is attached. 
     
    
    
     DESCRIPTION OF EMBODIMENT 
     The definition of the following terms applies throughout this specification and the claims. 
     “Substantially a polygonal shape” includes a shape in which at least one of a plurality of corner portions in a polygonal shape has an arc shape, in addition to a polygonal shape. 
     [Spout-Equipped Packaging Bag] 
     A spout-equipped packaging bag of the present invention includes a bag body that stores contents, and a spout that is attached to an upper portion of the bag body. The bag body includes a tubular barrel portion, and a bottom portion which is attached to block an opening end of a lower part of the barrel portion. The spout-equipped packaging bag of the present invention can stand by itself. In the spout-equipped packaging bag of the present invention, the spout includes a tubular nozzle portion, and a flange portion which projects from an outer surface of the nozzle portion. In addition, an upper end part of the tubular barrel portion over the entire circumference is liquid-tightly adhered to an upper surface of the flange portion in a state of following the shape (matching a shape) of the flange portion in plan view to be in the same shape. That is, the upper part of the barrel portion of the bag body spreads in the same shape as the shape of the flange portion in plan view. Here, the shape in plan view indicates a shape of the flange portion when the spout-equipped packaging bag of the present invention is viewed from above. 
     Hereinafter, an example of the spout-equipped packaging bag of the present invention will be described. Dimensions and the like of the diagrams exemplified in the following description are examples. The present invention is not necessarily limited to those and can be suitably changed and realized within a range not changing the gist thereof. 
     As illustrated in  FIG.  1   , a spout-equipped packaging bag  1  of the present embodiment includes a bag body  10  that stores contents, and a spout  12  that is attached to the upper portion of the bag body  10 . 
     The spout  12  is a member for discharging contents stored in the bag body  10  to the outside. As illustrated in  FIGS.  2 A and  2 B , the spout  12  includes a tubular nozzle portion  14 , a flange portion  16  which projects from a lower end on an outer surface  14   a  of the nozzle portion  14 , and a cap portion  18  which is mounted such that an opening end  14   b  of the nozzle portion  14  on the upper side is blocked. 
     The spout  12  is provided in the upper portion of the bag body  10  such that the axial direction of the nozzle portion  14  becomes the up-down direction. In the outer surface  14   a  of the nozzle portion  14 , a first engagement projection  15  of a protrusion is provided to protrude radially outward and extend spirally. On an inner surface  18   a  of a side wall of the cap portion  18 , a second engagement projection  17  of a protrusion is provided to protrude radially inward and extend spirally. In the spout  12 , the cap portion  18  can be screwed into the nozzle portion  14  and can be detachably mounted thereon utilizing a screw effect of engagement between the first engagement projection  15  and the second engagement projection  17 . 
     For example, when a beverage is stored inside of the bag body  10 , a user can drink the beverage by holding a distal end part of the nozzle portion  14  in the mouth and sucking the beverage after detaching the cap portion  18 . 
     The flange portion  16  has a plate shape and projects from the lower end on the outer surface  14   a  of the nozzle portion  14  in a direction perpendicular to the axial direction of the nozzle portion  14 . In the spout  12 , the nozzle portion  14  is positioned in a central portion of the flange portion  16  in plan view. In the present invention, the spout is not limited to a form in which the flange portion is provided to project outward from the lower end on the outer surface of the nozzle portion. For example, the present invention may adopt a form in which the flange portion is provided to project outward from a middle portion in the length direction on the outer surface of the nozzle portion. 
     In this example, the shape of the flange portion  16  in plan view is substantially a rectangular shape in which all of four corner portions of a rectangle have an arc shape in which the corner portions are rounded. The shape of the flange portion  16  in plan view is not limited to the shape in this example. Examples thereof include polygonal shapes such as rectangular shapes and octagonal shapes, shapes in which at least one of a plurality of corner portions in a polygon such as an octagon has an arc shape, and circular shapes. 
     As the shape of the flange portion in plan view, from the viewpoint that manufacturing of spout-equipped packaging bags is facilitated, it is preferable to adopt substantially a polygonal shape in which the number of corner portions is a multiple of four. It is preferable to adopt a shape in which all of four corner portions of a rectangle as in this example have an arc shape, a rectangular shape, a shape in which all of eight corner portions of an octagon have an arc shape, and an octagonal shape. It is more preferable to adopt a shape in which all of four corner portions of a rectangle have an arc shape, and a rectangular shape. 
     In addition, if the shape of the flange portion in plan view is a rectangle or a polygon such as an octagon, the upper part of the bag body is easily bent along edges of the flange portion, and a sharp brace extending in the up-down direction is easily formed in the upper part of the bag body. In contrast, if a shape in which all corner portions of a polygonal shape have an arc shape is adopted as the shape of the flange portion in plan view, there is no concern that corner portions of the flange portion will pierce parts corresponding to the corner portions of the flange portion in the upper part of the bag body, and therefore discomfort when the corner portions of the flange portion are held with the hand can be further reduced. In this respect, it is preferable that the shape of the flange portion in plan view be a shape in which all of four corner portions of a rectangle have an arc shape, or a shape in which all of eight corner portions of an octagon have an arc shape. 
     The flange portion  16  has four linear sides including a first side  16   a , a second side  16   b , a third side  16   c , and a fourth side  16   d . The first side  16   a  and the third side  16   c  are parallel to each other, and the second side  16   b  and the fourth side  16   d  are parallel to each other. The spout  12  is disposed such that the first side  16   a  becomes the front surface side of the spout-equipped packaging bag  1  and the third side  16   c  becomes the rear surface side of the spout-equipped packaging bag  1 . 
     The size of the flange portion  16  in plan view may be suitably set in accordance with the size of the bag body  10  and the purpose or the like of the spout-equipped packaging bag  1 . It is preferable that the length of an outer edge of the flange portion  16  over the entire circumference be the same as or slightly larger than the length of an opening edge on the upper side over the entire circumference in a tubular barrel member  20 A forming a barrel portion  20  of the bag body  10 . 
     Although it depends on the kind of a synthetic resin to be used, the thickness of the flange portion  16  is preferably within a range of 0.5 mm to 3.0 mm and is more preferably within a range of 0.7 mm to 1.5 mm. If the thickness of the flange portion  16  is equal to or larger than the lower limit values of the foregoing ranges, the flange portion can have a brace, so that the upper portion of the barrel portion of the spout-equipped packaging bag can be maintained in a spread state. 
     Regarding the material of the spout  12 , it is preferable that at least a part of the flange portion  16  which is adhered to an inner surface of the bag body  10  be formed of a synthetic resin. 
     Examples of a synthetic resin include a polyolefin resin, a polyamide resin, a polyester resin, a (meth)acrylic resin, a vinyl chloride resin, a vinylidene chloride resin, a polyether sulfone, and an ethylene-vinyl alcohol copolymer. Among these, in terms of excellent workability and low cost, it is preferable to use a polyolefin resin. 
     Examples of a polyolefin resin include high-density polyethylene, medium density polyethylene, high-pressure-method low-density polyethylene, linear low-density polyethylene, a polyethylene-based resin such as an ethylene-vinyl acetate copolymer, an olefin-based elastomer such as an ethylene-α-olefin copolymer, polypropylene, an ethylene-propylene random copolymer, a polypropylene-based resin such as an α-olefin-propylene random copolymer, and a cyclic polyolefin resin. These resins may be combined in order to improve the performance or may be partially cross-linked for the purpose of improvement in heat resistance and the like. 
     The spout  12  may be formed of a single material or may be formed to have a multi-layer structure constituted of various resin layers. 
     Regarding a resin forming at least a part of the flange portion  16  in the spout  12  which is adhered to the inner surface of the bag body  10 , in terms of adhesive properties obtained through heat-sealing, it is preferably a resin of the same kind as the resin forming a sealant layer (which will be described below) of the bag body  10  on the inner surface side. 
     As illustrated in  FIG.  1   , the bag body  10  includes the tubular barrel portion  20 , and a bottom portion  22  which is attached to block the opening end of a lower part of the barrel portion  20 . 
     The barrel portion  20  is formed by causing the rectangular barrel member  20 A to be in a tubular shape. It is preferable that the barrel member  20 A be made of a film material, at least a base material layer and the sealant layer be laminated, and a laminated film in which the innermost layer that becomes the inner side of the tubular shape of the barrel portion  20  serves as the sealant layer be used. 
     Regarding the base material layer, it is preferable to use a film on which excellent printing is possible and having piercing strength, tensile strength, shock resistance, and the like. Examples of the material of the base material layer include polyethylene terephthalate, polypropylene, polyamide, and an ethylene vinyl alcohol copolymer. It is preferable to use a biaxially stretched film or a uniaxially stretched film formed of these. In addition, in order to apply barrier properties with respect to oxygen and water vapor, a deposited film obtained by depositing a metal such as aluminum or magnesium or an oxide such as silicon oxide on these films, or a coated film which is coated with a coating agent such as polyvinylidene chloride having barrier properties may be used. The base material layer may be a single body of the foregoing film or may be a laminated body. 
     The sealant layer is a heat-sealable layer that can be heated and melted within a temperature range in which the shape of the base material layer can be maintained. Examples of the material of the sealant layer include polyethylene such as high-density polyethylene, low-density polyethylene, and linear low-density polyethylene, and polypropylene. It is preferable to use an unstretched film formed of these or a material obtained by extruding the foregoing resin in a layered shape. 
     As necessary, the laminated film may have an intermediate layer between the base material layer and the sealant layer. 
     Examples of the intermediate layer include films having functionality such as oxygen barrier properties, water vapor barrier properties, and tearability. Specific examples of the intermediate layer include a metal foil such as aluminum, the deposited film described above, and a coated film. 
     The base material layer, the sealant layer, and the laminated film including the intermediate layer which is used as necessary can be manufactured by a known method such as a dry lamination method using an adhesive or an extrusion lamination method using a thermoadhesive resin. 
     The barrel member  20 A may be a single-layer film constituted of a heat-sealable film. 
     In the present embodiment, both side end sides of the rectangular barrel member  20 A are bent along bend lines L 1  and L 2  indicated in  FIG.  4 B . As illustrated in  FIGS.  1    and  3 , a folded back side end  20   a  and a folded back side end  20   b  of the barrel member  20 A are caused to abut each other and form a tubular shape. In the barrel portion  20 , a part  21 A (refer to  FIG.  4 B ) between the bend line L 1  and the bend line L 2  of the barrel member  20 A becomes a part on the front surface side. In the barrel member  20 A, a part  21 B between the bend line L 1  and the side end  20   a , and a part  21 C between the bend line L 2  and the side end  20   b  become parts on the rear surface side. Hereinafter, as illustrated in  FIG.  3   , a part of the barrel portion  20  corresponding to the part  21 A of the barrel member  20 A when the bag body  10  is in a flat state will be referred to as a front surface portion  28 , and parts of the barrel member  20 A corresponding to the part  21 B and the part  21 C will be referred to as a rear surface portion  30 . 
     Here, the bend lines L 1  and L 2  of the barrel member  20 A indicate positions intended to be bent. The bend lines L 1  and L 2  of the barrel member  20 A respectively coincide with side edges  23   a  and  23   b  of the barrel portion  20  when the bag body  10  is in a flat state. 
     In this example, as illustrated in  FIGS.  1  and  5 A , the side end  20   a  and the side end  20   b  of the barrel member  20 A are caused to abut each other such that there is no gap therebetween and are heat-sealed in a heat-seal portion HS 3  in a state where an adhesive film  26  overlaps the inner surface sides thereof, such that a back joint  25  is formed and the barrel member  20 A has a tubular shape. In such a form, the side end  20   a  and the side end  20   b  of the barrel member  20 A may have a slight gap therebetween or may slightly overlap each other, as long as they are sealed by the adhesive film  26  with no gap therebetween. 
     The adhesive film  26  is a film of which both surfaces have heat-sealing properties to be able to be beat-sealed to the sealant layers of the barrel member and the bottom member and which is formed of a resin of the same kind as the resin forming the sealant layer of the barrel member and the bottom member. Examples of the adhesive film  26  include a laminated film of which both surfaces are sealant layers, a single-layer film, and a co-extruded film. Among these, from the viewpoint that it melts entirely in the thickness direction due to heat of heat-sealing and its thickness becomes thinner, it is preferable to use a synthetic resin film of a single layer as the adhesive film  26 . 
     The form of the back joint  25  is not limited to a form of using the adhesive film  26 . For example, as illustrated in  FIG.  5 B , an envelope joint in which the inner surface of the side end  20   a  and the outer surface of the side end  20   b  in the barrel member  20 A are adhered to each other may be adopted, or as illustrated in  FIG.  5 C , a butt joint in which the inner surfaces of the side end  20   a  and the side end  20   b  of the barrel member  20 A are adhered to each other may be adopted. An envelope joint or a butt joint of the side end  20   a  and the side end  20   b  may be realized through heat-sealing or may be realized using an adhesive. 
     In the spout-equipped packaging bag  1 , the bag body  10  and the spout  12  are adhered to each other as follows, and an upper end part  21  of the tubular barrel portion  20  of the bag body  10  is in a state of following the shape of the flange portion  16  in plan view to be in the same shape. In the upper end part  21  over the entire circumference of the tubular barrel portion  20  of the bag body  10 , a portion of the front surface portion  28  when in a flat shape corresponds to the first side  16   a  of the flange portion  16  of the spout  12 . A first part  21   a  (corresponding part) on the front surface side is be inward along the first side  16   a  of the flange portion  16  and is heat-sealed to an upper surface  16   e  of the flange portion  16  in a heat-seal portion HS 5   a . The first part  21   a  of the barrel portion  20  is heat-sealed to the upper surface  16   e  of the flange portion  16  in a trapezoidal shape narrowed toward the middle of the flange portion  16  in a state of being bent along the first side  16   a  of the flange portion  16  in plan view. 
     On a distal end side of the first part  21   a  of the barrel portion  20 , a semicircular cut-out portion  19  is formed at a position corresponding to the nozzle portion  14  of the spout  12 . When the cut-out portion  19  is not formed, in order to avoid overlapping between the nozzle portion  14  of the spout  12  and the first part  21   a , there is a need to decrease the dimension of the trapezoidal shape of the first part  21   a  in the height direction. 
     That is, when the cut-out portion  19  is not formed, them is a need to provide a first ruled line  48   a  (which will be described below) at a position thereabove. When the cut-out portion  19  is formed, compared to a case where the cut-out portion  19  is not formed, the area of the first part  21   a  of the barrel portion  20  adhered to the upper surface  16   e  of the flange portion  16  of the spout  12  can be further increased. In the present invention, in this manner, it is preferable that a cut-out portion be formed in the upper end part of the barrel member at a position corresponding to the nozzle portion of the spout when folded and the area of the barrel member adhered to the upper surface of the flange portion of the spout be increased as much as possible. Accordingly, contents can be more stably inhibited from unintentionally leaking from the upper portion of the bag body. 
     Similar to the first part  21   a  of the barrel portion  20 , in the upper end pan  21  of the tubular barrel portion  20 , a portion of the rear surface portion  30  when in a flat shape corresponds to the third side  16   c  of the flange portion  16  of the spout  12 . A third part  21   c  (corresponding part) on the rear surface side is heat-sealed to the upper surface  16   e  of the flange portion  16  in a heat-seal portion HS 5   c  in a state of being bent along the third side  16   c  of the flange portion  16  to be in a trapezoidal shape in plan view. On a distal end side of the third part  21   c  of the barrel portion  20  as well, similar to the distal end side of the first part  21   a  of the barrel portion  20 , the semicircular cut-out portion  19  is formed at a position corresponding to the nozzle portion  14  of the spout  12 . 
     In addition, in the upper end part  21  of the tubular barrel portion  20 , a second part  21   b  (between the first part  21   a  on the front surface side and the third part  21   c  on the rear surface side) corresponding to the second side  16   b  of the flange portion  16  of the spout  12  and a fourth part  21   d  (between the third part  21   c  on the rear surface side and the first part  21   a  on the front surface side) corresponding to the fourth side  16   d  of the flange portion  16  are heat-sealed to the upper surface  16   e  of the flange portion  16  respectively in heat-seal portions HS 5   b  and HS 5   d  in a state of being bent along the second side  16   b  and the fourth side  16   d  of the flange portion  16  to be in a trapezoidal shape in plan view. Portions of the second part  21   b  and the fourth part  21   d  in the upper end part  21  of the barrel portion  20  overlap the first part  21   a  and the third part  21   c  while parts between the first part  21   a  and the third part  21   c , and the second part  21   b  and the fourth part  21   d  are bent to enter locations below the second part  21   b  and the fourth part  21   d , respectively. 
     As described above, the upper end part  21  is folded easily and neatly by folding the upper end part  21  of the tubular barrel portion  20  such that the first part  21   a  to the fourth part  21   d  form a trapezoidal shape in plan view, and therefore it is easy for the spout  12  to be liquid-tightly adhered to the upper portion of the barrel portion  20 . 
     In the heat-seal portions HS 5   a  to HS 5   d , the outer surfaces of the barrel member  20 A are in contact with each other in regions in which the second part  21   b  and the fourth part  21   d  overlap the first part  21   a  and the third part  21   c  in the upper end part  21  of the barrel portion  20 . Generally, the base material layer forming the outer surface does not have heat-sealing properties. Therefore, only the parts may be subjected to adhesion in which an adhesive is applied. However, it is preferable that the outermost layers in at least the foregoing regions of the barrel member  20 A have heat-sealing properties and are adhered to each other through heat-sealing. Specific examples of the outermost layer in at least the foregoing regions of the barrel member  20 A include a layer formed by applying a partial coating agent having heat-sealing properties on the outer surface, and a layer constituted of a film having heat-sealing properties. 
     The form in which the upper end part  21  of the barrel member  20 A is adhered to the upper surface  16   e  of the flange portion  16  of the spout  12  is not limited to a form performed through heat-sealing. For example, a form performed using an adhesive may be adopted. 
     In this manner, in the spout-equipped packaging bag  1 , the first part  21   a  to the fourth part  21   d  in the upper end pan  21  of the tubular barrel portion  20  are respectively bent along the first side  16   a  to the fourth side  16   d  of the flange portion  16  and are liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  in a state of being folded on the upper surface  16   e  of the flange portion  16 . Accordingly, the upper end par  21  of the tubular barrel portion  20  is in a state of following the shape of the flange portion  16  in plan view to be in the same shape and in a spread state. In this manner, when the upper end part  21  of the tubular barrel portion  20  is liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  in a state of being folded throughout the entire circumference, an annular seal portion protruding upward (refer to the spout-equipped packaging bag in Patent Document 2) is not formed around the spout  12  in the upper portion of the spout-equipped packaging bag  1 . Therefore, for example, even when a beverage or the like is stored inside of the bag body and a user drinks the beverage or the like through the spout, since a seal portion protruding upward does not come into contact with the face, discomfort is reduced. 
     In addition, since a particularly hard Y-shaped seal portion (refer to the spout-equipped packaging bag in Patent Document 2) is not formed on a side part side of the bag body  10  of the spout-equipped packaging bag  1 , discomfort when the bag body  10  is held with the hand is further reduced. 
     As illustrated in  FIGS.  3  and  4   , the bottom portion  22  of the bag body  10  is formed while being adhered to a part below inside of the barrel portion  20  such that the opening end of the tubular barrel portion  20  is blocked while having a bend line  22   a  thereof on the side thereabove in a state where a bottom member  22 A formed of a rectangular film material is folded in half. Accordingly, contents can be stored inside of the bag body  10 , and the stored contents can be poured out from the spout  12 . 
     When contents are stored inside of the bag body  10 , the bottom portion  22  is in a state of being forced to spread downward as illustrated in  FIG.  1   . Therefore, the spout-equipped packaging bag  1  can stand by itself. When contents are stored inside of the bag body  10 , the bottom portion  22  of the bag body  10  has a circular shape or substantially an oval shape when viewed from below, and it may have obtuse corner portions. 
     As illustrated in  FIG.  4 A , a surface of the bottom member  22 A folded in half is divided into a first bottom surface portion  22   b  and a second bottom surface portion  22   c  by the bend line  22   a  as a border. In a state of being folded in half, a side end  22   d  of the first bottom surface portion  22   b  and a side end  22  of the second bottom surface portion  22   c  coincide with each other, a side end  22   f  of the first bottom surface portion  22   b  and a side end  22   g  of the second bottom surface portion  22   c  coincide with each other, and a lower end  22   h  of the first bottom surface portion  22   b  and a lower end  22   i  of the second bottom surface portion  22   c  coincide with each other. In the bottom portion  22 , each of the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A is adhered to the inner surface of the barrel portion  20 , and the lower ends  22   h  and  22   i  of the bottom member  22 A are adhered to a lower end  20   c  of the barrel portion  20  throughout the entire circumference of the barrel portion  20 . 
     As illustrated in  FIG.  4 B , in a process of manufacturing the spout-equipped packaging bag  1 , the bottom member  22 A in a state of being folded in half is disposed on the barrel member  20 A such that a centerline a of the bottom member  22 A in the width direction and a centerline b of the barrel member  20 A in the width direction substantially coincide with each other while having the second bottom surface portion  22   c  on the barrel member  20 A side. In the spout-equipped packaging bag  1 , the second bottom surface portion  22   c  faces the front surface portion  28  of the barrel portion  20 , and the first bottom surface portion  22   b  faces the rear surface portion  30  of the barrel portion  20 . 
     A length D 1  between both side ends of the bottom member  22 A folded in half is larger than the width between the bend lines L 1  and L 2  of the barrel member  20 A, that is, a width D 2  of the part  21 A and exceeds the bend lines L 1  and L 2  of the barrel member  20 A. When the barrel member  20 A has a tubular shape, the bottom member  22 A is bent together with the barrel member  20 A on the bend lines L 1  and L 2  of the barrel member  20 A. That is, the length D 1  between both side ends of the bottom member  22 A is larger than the width of the barrel portion  20  when the bag body  10  is in a flat shape. 
     In a self-standing packaging bag in which a bottom portion is formed below a barrel portion by attaching a bottom member folded in half, a load of contents is likely to be concentrated inside of the bag at the upper end of a part along a side edge of the barrel portion in the bottom portion. Therefore, when a corner at the side end of the bottom member folded in half lies along the side edge of the barrel portion, a load of contents is likely to be concentrated on the corner at the side end of the bottom member, and there is a possibility that rupture occurs in this part and the contents leak. 
     In contrast, when the length D 1  between both side ends of the bottom member  22 A is larger than the width of the barrel portion  20 , as illustrated in  FIGS.  1 ,  3 , and  6 A , the side ends  22   d  and  22   e  side of the bottom member  22 A folded in half is bent at the side edge  23   a  of the barrel portion  20  and is attached to the inner surface of the rear surface portion  30 . Accordingly, in the spout-equipped packaging bag  1 , since a load of contents is received in a part bent together with the barrel member  20 A in the bottom member  22 A instead of the corners at both ends folded in half on the bend line  22   a  of the bottom member  22 A, a significant force is not concentrated on the side edge of the bottom member  22 A on the side ends  22   d  and  22   e  side. Therefore, rupture of the bottom member  22 A is unlikely to occur in parts of the side ends  22   d  and  22   c , and an effect of inhibiting leakage of contents is high. Similarly, the side ends  22   f  and  22   g  side of the bottom member  22 A folded in half is bent at the side edge  23   b  of the barrel portion  20 , and the side ends  22   f  and  22   g  are attached to the inner surface of the rear surface portion  30 . Accordingly, rupture of the bottom member  22 A is also unlikely to occur in parts of the side ends  22   f  and  22   g , and an effect of inhibiting leakage of contents becomes high. 
     In the spout-equipped packaging bag of the present invention, the side end of the bottom member folded in half may coincide with the side edge of the barrel portion. 
     The distance between the side ends  22   d  and  22   e  of the bottom member  22 A and the side edge  23   a  of the barrel portion  20 , that is, a distance D 3  between the side ends  22   d  and  22   e  of the bottom member  22 A and the bend line L 1  of the barrel member  20 A is preferably 1.0 mm or longer and is more preferably 3.0 mm or longer. If the distance D 3  is 1.0 mm or longer, it is easy to inhibit rupture of pans of the side ends  22   d  and  22   e  of the bottom member  22 A and leakage of contents. If the distance D 3  has a length to a certain extent, when the spout-equipped packaging bag is filled with contents, as illustrated in  FIG.  7   , positions corresponding to the positions of the side ends  22   d  and  22   e  of the bottom member  22 A in the barrel member  20 A become bend lines, such that the barrel member  20 A is bent and obtuse corner portions  29  are easily formed on the bottom portion  22  side of the barrel portion  20 . They are easily formed when a rigid laminated body, such as a laminated body in which a metal such as an aluminum foil is laminated on a film, is used as the barrel member and the bottom member. In addition, in this case, although the length of the distance  13  to a certain extent is influenced by the size of the spout-equipped packaging bag, the corner portions are easily formed when it has a distance of at least 10 mm or longer. 
     In addition, a preferable range of the distance between the side ends  22   f  and  22   g  of the bottom member  22 A and the side edge  23   b  of the barrel portion  20 , that is, a distance D 4  between the side ends  22   f  and  22   g  of the bottom member  22 A and the bend line L 2  of the barrel member  20 A is similar to that of the distance D 3 . 
     The distance D 3  and the distance D 4  may be the same as each other or may be different from each other. However, in terms of an even better appearance, it is preferable that they be the same as each other. 
     Regarding the bottom member  22 A, it is preferable to use a laminated film in which at least the base material layer and the sealant layer are laminated. The bottom member  22 A is folded in half having the sealant layer on the outer side, and the innermost layer on a side facing the inner surface of the barrel portion  20  inside of the bag body  10  is the sealant layer. Examples of the base material layer and the sealant layer of the bottom member  22 A can be the same as the examples of the base material layer and the sealant layer in the barrel member  20 A. In addition, when the bottom member  22 A is a laminated film, it may have an intermediate layer. Examples of the intermediate layer of the bottom member  22 A can be the same as the examples of the intermediate layer in the barrel member  20 A. 
     The bottom member  22 A and the barrel member  20 A may be constituted of films of the same materials or may be constituted of films of the different materials. However, from the viewpoint that they can be adhered to each other through heat-sealing, it is preferable that both be laminated films having a sealant layer formed of a resin of the same kind. 
     Regarding the laminated body of the bottom member and the adhesive film (which will be described below), when a laminated film in which the bottom member and the adhesive film are integrated is used, the adhesive film may also serve as the sealant layer of the bottom member. 
     As illustrated in  FIGS.  3 ,  4 A, and  4 B , on the barrel portion  20  side in the bottom member  22 A, that is, on a side inward from the bottom member  22 A in the bag body  10 , an adhesive film  24  for causing the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A to be adhered to the barrel portion  20  is laminated such that the bottom member  22 A in its entirety is covered. The side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A are adhered to the inner surface of the barrel portion  20  utilizing the adhesive film  24 . 
     The adhesive film  24  is laminated on a surface of the sealant layer of the bottom member  22 A. Here, the term “being laminated” may indicate a state where the bottom member  22 A and the adhesive film  24  are adhered to each other on the entire surface or a state where only parts thereof are adhered to each other, and also includes a state of merely overlapping each other without being adhered to each other. Then, when the bottom member  22 A is interposed between the adhesive films  24 , both the adhesive film  24  and the bottom member  22 A are folded in half on a bend line  24   a . A surface of the adhesive film  24  folded in half is divided into a first flat surface portion  24   b  and a second flat surface portion  24   c.    
     In a state of being folded in half, a side end  24   d  of the first flat surface portion  24   b  and a side end  24   e  of the second flat surface portion  24   c  coincide with each other, a side end  24   f  of the first flat surface portion  24   b  and a side end  24   g  of the second flat surface portion  24   c  coincide with each other, and a lower end  24   h  of the first flat surface portion  24   b  and a lower end  24   i  of the second flat surface portion  24   c  coincide with each other. The second flat surface portion  24   c  of the adhesive film  24  is positioned on the part  21 A of the barrel member  20 A side, that is, on the front surface side of the barrel portion  20  in the spout-equipped packaging bag  1 . Meanwhile, the first flat surface portion  24   b  of the adhesive film  24  is positioned on the rear surface side of the barrel portion  20  in the spout-equipped packaging bag  1 . 
     As illustrated in  FIG.  4 A , the side ends  24   d  and  24   e  on one side in the adhesive film  24  folded in half protrude in the width direction from the side ends  22   d  and  22   e  on one side in the bottom member  22 A folded in half. In addition, the side ends  24   f  and  24   g  on the opposite side in the adhesive film  24  folded in half protrude in the width direction from the side ends  22   f  and  22   g  on the opposite side in the bottom member  22 A folded in half. In this manner, each of the side ends  24   d  and  24   e  and the side ends  24   f  and  24   g  on both sides in the adhesive film  24  protrudes in the width direction from the bottom member  22 A. 
     In the spout-equipped packaging bag  1 , as illustrated in  FIGS.  1 ,  3 , and  6 A , in a state where both the side ends  24   d  and  24   e  side of the adhesive film  24  and the side ends  22   d  and  22   e  side of the bottom member  22 A are bent at the side edge  23   a  of the barrel portion  20 , the adhesive film  24 , the bottom member  22 A, and the barrel portion  20  are adhered to each other through heat-sealing in a heat-seal portion HS 1  including the side ends  22   d  and  22   e  of the bottom member  22 A. Specifically, in the heat-seal portion HS 1 , the adhesive film  24  and the bottom member  22 A are adhered to each other, the adhesive film  24  and a part on the rear surface side of the barrel portion  20  are adhered to each other, and parts of the adhesive film  24  protruding from the bottom member  22 A are adhered to each other. Accordingly, the side ends  22   d  and  22   e  of the bottom member  22 A are closed by the adhesive film  24  and are attached to the inner surface of the barrel portion  20  on the rear surface portion side through adhesion. An end of the heat-seal portion HS 1  in the height direction is formed beyond the bend line  22   a  of the bottom member  22 A folded in half. In addition, an end of the heat-seal portion HS 1  in the width direction will be described below. 
     Similarly, in a state where both the side ends  24   f  and  24   g  side of the adhesive film  24  and the side ends  22   f  and  22   g  side of the bottom member  22 A are bent at the side edge  23   b  of the barrel portion  20 , the adhesive film  24 , the bottom member  22 A, and the barrel portion  20  are adhered to each other through heat-sealing in a heat-seal portion HS 2  including the side ends  22   f  and  22   g  of the bottom member  22 A. Specifically, in the heat-seal portion HS 2 , the adhesive film  24  and the bottom member  22 A are adhered to each other, the adhesive film  24  and a part on the rear surface side of the barrel portion  20  are adhered to each other, and parts of the adhesive film  24  protruding from the bottom member  22 A are adhered to each other. Accordingly, the side ends  22   f  and  22   g  of the bottom member  22 A are closed by the adhesive film  24  and are attached to the inner surface of the barrel portion  20  on the rear surface side through adhesion. An end of the heat-seal portion HS 2  in the height direction is formed beyond the bend line  22   a  of the bottom member  22 A folded in half. In addition, an end of the heat-seal portion HS 2  in the width direction will be described below. 
     In the spout-equipped packaging bag  1 , since both the side ends  24   d  and  24   e  and the side ends  24   f  and  24   g  of the adhesive film  24  respectively protrude in the width direction from both the side ends  22   d  and  22   c  and the side ends  22   f  and  22   g  of the bottom member  22 A and there is one adhesive film  24 , it is easy to control the positional relationship between the bottom member  22 A and the adhesive film  24  which are laminated. Accordingly, even if the spout-equipped packaging bag  1  has a small size, it is easy to inhibit a positional deviation between the bottom member  22 A and the adhesive film  24  and the occurrence of an adhesive failure, and therefore it is easy to inhibit leakage of contents regardless of the size. 
     The adhesive film  24  is a member having a function of attaching the side ends  22   d  to  22   g  on both sides in the bottom member  22 A to the inner surface of the barrel portion  20  through adhesion and is a film of which both surfaces have heat-sealing properties. Regarding the adhesive film  24 , from the viewpoint that it has sealing properties to be able to be heat-sealed to the sealant layers of the barrel member and the bottom member, a film formed of the same material as the film in the adhesive film  26  can be used, it melts entirely in the thickness direction due to heat of heat-sealing, and its thickness becomes thinner, it is preferable to use a synthetic resin film of a single layer. In addition, if the adhesive film  26  is a synthetic resin film of a single layer, the adhesive film  24  melts in the heat-seal portion HS 1  and the heat-seal portion HS 2  due to heat of heat-sealing and is likely to enter a stepped part on the border formed depending on the presence or absence of the side ends  22   d  and  22   e  of the bottom member  22 A and a stepped part on the border formed depending on the presence or absence of the side ends  22   f  and  22   g , and therefore a heat-sealing failure is less likely to occur. 
     In the spout-equipped packaging bag  1  in this example, as illustrated in  FIG.  4 B , in the parts  21 B and  21 C of the barrel member  20 A, one end of the heat-seal portion HS 1  in the width direction is formed to reach the bend line L 1 , and one end of the heat-seal portion HS 2  in the width direction is formed to reach the bend line L 2 . That is, in the rear surface portion  30  of the barrel portion  20 , the heat-seal portion HS 1  is formed to reach the side edge  23   a  of the barrel portion  20 , and the heat-seal portion HS 2  is formed to reach the side edge  23   b  of the barrel portion  20 . In the spout-equipped packaging bag  1 , it is preferable that a part which is adhered to the adhesive film  24  in a part of the barrel portion  20  to which both the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A are attached be only the rear surface portion  30  without straddling the bend lines L 1  and L 2 . That is, it is preferable that the heat-seal portion HS 1  and the heat-seal portion HS 2  do not lead to the front surface portion  28 . Accordingly, the bend line  22   a  of the bottom member  22 A is in a state of being not fixed to the front surface portion  28  of the barrel portion  20 . Therefore, since the upper portion of the bottom portion  22  easily spreads in the vicinity of the side edges  23   a  and  23   b  of the spout-equipped packaging bag  1  and parts in the vicinity of the side edges  23   a  and  23   b  of the barrel portion  20  easily spread in accordance therewith, self-standing stability is improved, and favorable appearance is easily obtained. 
     When the heat-seal portion HS 1  and the heat-seal portion HS 2  are formed in only the rear surface portion, as illustrated in  FIG.  13   , one end of the heat-seal portion HS 1  in the width direction does not have to lead to the bend line L 1 , and one end of the heat-seal portion HS 2  in the width direction does not have to lead to the bend line L 2 . That is, the heat-seal portion HS 1  and the heat-seal portion HS 2  do not have to lead to the side edges  23   a  and  23   b  of the barrel portion  20 . In this case as well, since the upper portion of the bottom portion  22  easily spreads in the vicinity of the side edges  23   a  and  23   b  of the spout-equipped packaging bag  1  and parts in the vicinity of the side edges  23   a  and  23   b  of the barrel portion  20  easily spread in accordance therewith, self-standing stability is improved, and favorable appearance is easily obtained. 
     As long as self-standing stability and design are within a range such that they do not deteriorate, as illustrated in  FIG.  14   , a form can be adopted in which one ends of the heat-seal portion HS 1  and the heat-seal portion HS 2  in the width direction leads to the part  21 A of the barrel member  20 A, that is, the front surface portion of the barrel portion  20  while straddling the bend line L 1  and the bend line L 2 . 
     The other ends of the heat-seal portions HS 1  and HS 2  in the width direction need only be positioned on the side ends  20   a  and  20   b  side of the barrel member  20 A while respectively straddling the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A. Accordingly, parts of the adhesive film  24  protruding from the side ends  22   d  and  22   e  of the bottom member  22 A are adhered to each other, and parts protruding from the side ends  22   f  and  22   g  are adhered to each other. Therefore, a gap between the side end  22   d  and the side end  22   e  of the bottom member  22 A is closed and a gap between the side end  22   f  and the side end  22   g  is closed. 
     In addition, the other ends of the heat-seal portions HS 1  and HS 2  in the width direction may be respectively positioned on the side ends  20   a  and  20   b  side of the barrel member  20 A beyond the side ends  24   d  and  24   c  and the side ends  24   f  and  24   g  of the adhesive film  24 . Accordingly, a gap between the side end  24   d  and the side end  24   e  and a gap between the side end  24   f  and the side end  24   g  are closed. Therefore, contents can be inhibited from entering the gaps therebetween. 
     In the spout-equipped packaging bag  1 , as illustrated in  FIGS.  1 ,  3 ,  6 A, and  6 B , when the lower ends  22   h  and  22   i  of the bottom member  22 A folded in half and the lower end  20   c  of the barrel member  20 A in a tubular shape are heat-scaled throughout the entire circumference of the barrel portion  20 , a belt-shaped heat-seal portion HS 4  is formed. When the heat-seal portion HS 4  reaches the lower edge of the barrel portion  20 , its self-standing properties are improved, which is preferable. Accordingly, the opening end on the side below in the spout-equipped packaging bag  1  is closed, and the bottom portion  22  is formed. The width of the belt-shaped heat-seal portion HS 4  is preferably within a range of 2 mm to 30 mm and is more preferably within a range of 3 mm to 10 mm. 
     A part on a side above the heat-seal portion HS 4  in the front surface portion  28  of the barrel portion  20  is not adhered to the adhesive film  24 . In addition, the first flat surface portion  24   b  and the second flat surface portion  24   c  in the adhesive film  24  being in contact with each other in a bent state are adhered to each other in the heat-seal portion HS 4 . 
     In the spout-equipped packaging bag  1 , the tubular shape of the bag body  10  when contents are stored has a circular or substantially oval cross section on the bottom portion  22  side and is a tubular shape which may have obtuse corner portions. The upper portion side is in a tubular shape having substantially a rectangular cross section due to the influence of the flange portion  16  of the spout  12 . 
     In addition, in the bag body  10  of the spout-equipped packaging bag  1 , the barrel portion  20  has a tubular shape with no side seal portion projecting outward in plan view. Therefore, when the bag body  10  is held with the hand, since the side seal portion does not come into contact with the hand, discomfort is reduced. 
     The purpose of the spout-equipped packaging bag of the present invention is not particularly limited and can be used as a container for storing contents such as beverages having fluidity or a refillable container, for example. 
     As described above, in the spout-equipped packaging bag of the present invention, since the bottom portion is formed to block the opening end of a lower part of the barrel portion, when contents are stored, the bottom portion of the bag body spreads and it can stand by itself. In addition, the upper end part of the barrel portion over the entire circumference is in a state of following a shape of the flange portion of the spout in plan view to be in the same shape and is adhered to the upper surface in a folded state, and the spout is attached to the upper portion of the bag body. In other words, in the spout-equipped packaging bag of the present invention, the entire circumference in the upper end part of the tubular barrel portion is liquid-tightly adhered to the upper surface of the flange portion on the spout, and the barrel portion connected to the upper end part includes the bottom portion which is hung down along the shape of a surrounding portion of the flange portion and blocks the opening end of a lower part of the barrel portion. Accordingly, since the shape of the upper portion of the bag body is retained in a spread tubular shape by the flange portion of the spout, even when the amount of contents decreases, the upper portion of the bag body is unlikely to be bent due to the weight of the spout, and therefore sufficient self-standing properties can be ensured. 
     In addition, in the spout-equipped packaging bag of the present invention, the upper end part of the barrel portion is adhered to the upper surface of the flange portion of the spout in a folded state, and an annular seal portion protruding upward or a Y-shaped hard seal portion on the side part side is not formed in the upper portion of the bag body (refer to the spout-equipped packaging bag in Patent Document 2). Therefore, discomfort when a beverage or the like is stored and a user drinks the beverage or the like through the spout or when the bag body is held with the hand is reduced. 
     The spout-equipped packaging bag of the present invention is not limited to the foregoing spout-equipped packaging bag  1 . 
     For example, the tubular barrel member is not limited to a tubular member realized by causing side ends of a rectangular barrel member to abut and to be adhered to each other. A tubular film obtained through inflation molding may be used. In addition, the tubular barrel member may be a tubular member realized by combining two or more film materials through heat-sealing or the like. When a barrel portion is formed by combining two or more barrel members, a side seal portion extending in the up-down direction is formed in this barrel portion. However, in this case, it is preferable that this side seal portion in its entirety be folded back and be adhered to a surface of the barrel portion. Accordingly, the side seal portion can be prevented from projecting outward in plan view. Therefore, discomfort when the barrel portion of the bag body is held with the hand is further reduced. 
     In addition, the barrel member and the bottom member in the bag body may be formed of the same film material, and the barrel member and the bottom member may be integrated. 
     In the foregoing spout-equipped packaging bag, for example, regarding the barrel portion of the bag body, in place of the barrel portion  20 , a bag body including a barrel portion  50  illustrated in  FIG.  15    as an example may be provided. The barrel portion  50  is constituted of two barrel members  50 A and  50 B formed in a tubular shape. The width of the barrel member  50 A is larger than the width of the barrel member  50 B. Side end portions of the barrel member  50 A and the barrel member  501  on one side and side end portions thereof on the opposite side are scaled to each other, and two side seal portions  52  are formed in a tubular shape. The width of a part  54  between two side seal portions  52  in the barrel member  501  of the barrel portion  50  is equivalent to the length of the first side  16   a  in the flange portion  16  of the spout  12 . In the barrel portion  50 , it is preferable that any one or both of two side seal portions  52  be entirely folded back and be adhered to the part  54  side or to a side opposite thereto. 
     Even in a spout-equipped packaging bag using the barrel portion  50 , the tubular barrel portion constituted of two barrel members  50 A and  50 B is liquid-tightly adhered to the upper surface of the flange portion of the spout in a folded state, thereby being in a state of following a shape of the flange portion in plan view to be in the same shape. The shape of the upper portion of the bag body is maintained by the flange portion of the spout in a tubular shape in which a cross section spreads in a rectangular shape or the like. Accordingly, even when the amount of contents decreases, the upper portion of the barrel portion  50  is unlikely to be bent due to the weight of the spout, and therefore sufficient self-standing properties can be ensured. In addition, since an annular seal portion protruding upward or a Y-shaped hard seal portion on the side part side is not formed in the upper portion of the bag body (refer to the spout-equipped packaging bag in Patent Document 2), discomfort is also reduced. 
     In addition, the spout-equipped packaging bag  1  is realized in a form in which the adhesive film  24  is laminated such that the bottom member  22 A in its entirety is covered. However, the spout-equipped packaging bag of the present invention may be realized in a form in which adhesive films are laminated such that only both side end portions of the bottom member  22 A are covered, respectively. 
     In the spout-equipped packaging bag  1 , the upper end pan  21  of the barrel portion  20  adhered to the upper surface  16   e  of the flange portion  16  is folded such that portions of the second part  21   b  and the fourth part  21   d  overlap the first part  21   a  and the third pan  21   c . However, the folded form of the upper end part  21  is not limited to this form. For example, a form in which the upper end part  21  of the barrel portion  20  is folded such that portions of the second part  21   b  and the fourth part  21   d  overlap the first part  21   a , and a portion of the third part  21   c  overlaps the second part  21   b  and the fourth part  21   d  may be adopted. In addition, a form in which the upper end part  21  of the barrel portion  20  is folded such that a portion of the second part  21   b  overlaps the first part  21   a , a portion of the third part  21   c  overlaps the second part  21   b , and a portion of the fourth part  21   d  overlaps the first part  21   a  and the third part  21   c  may be adopted. 
     [Spout-Equipped Packaging Bag that Contains Contents] 
     The spout-equipped packaging bag that contains contents of the present invention is a spout-equipped packaging bag of the present invention in which contents are stored inside of the bag body. Contents are not particularly limited. Examples of contents include food such as weaning food and liquid food, seasonings, beverages, and contents such as shampoo, conditioner, and body soap having fluidity. 
     [Manufacturing Method for Spout-Equipped Packaging Bag] 
     The manufacturing method for a spout-equipped packaging bag of the present invention is a manufacturing method for a self-standing spout-equipped packaging bag including the bag body that stores contents, and the spout that is attached to the upper portion of the bag body. The bag body includes the tubular barrel portion, and the bottom portion which is attached to block the opening end of a lower part of the barrel portion. In the manufacturing method for a spout-equipped packaging bag of the present invention, the spout including the tubular nozzle portion, and the flange portion which protrudes from the outer surface of the nozzle portion is used such that the upper end part of the tubular barrel portion over the entire circumference is folded on the upper surface of the flange portion and is liquid-tightly adhered to this upper surface in a state of following the shape of the flange portion in plan view to be in the same shape. 
     According to the manufacturing method for a spout-equipped packaging bag of the present invention, the foregoing spout-equipped packaging bag of the present invention can be manufactured. 
     Hereinafter, as an example of the manufacturing method for a spout-equipped packaging bag, a manufacturing method for the foregoing spout-equipped packaging bag  1  will be described. The manufacturing method for the spout-equipped packaging bag  1  has the following steps (a) and (b). 
     (a) A step of attaching the bottom member  22 A folded in half to a part below inside of the barrel member  20 A while having the bend line  22   a  above, and forming the bag body  10  in which the opening end below the tubular barrel portion  20  is closed by the bottom portion  22   
     (b) The upper end part  21  of the tubular barrel portion  20  is folded on the upper surface  16   e  of the flange portion  16  in the spout  12  and is liquid-tightly adhered thereto in a state of following the shape of the flange portion in plan view to be in the same shape, and the spout  12  is attached to the upper portion of the bag body  10 . 
     (Step (a)) 
     For example, step (a) can be performed through the following steps (a1) to (a6). 
     (a1) A step of forming a laminated body  40  by laminating the bottom member  22 A and the adhesive film  24  such that both the side ends  24   d  and  24   e  and the side ends  24   f  and  24   g  of the adhesive film  24  in the width direction respectively protrude in the width direction from both the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A 
     (a2) A step of folding the laminated body  40  in half on a bend line  40   a  extending in the width direction such that the adhesive film  24  is on the outer side 
     (a3) A step of mounting the laminated body  40  folded in half on the rectangular barrel member  20 A 
     (a4) A step of attaching the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A to the barrel member  20 A by means of the adhesive film  24   
     (a5) A step of forming a tubular shape by causing the side ends  20   a  and  20   b  of the barrel member  20 A to be adhered to each other such that the surface to which the bottom member  22 A of the barrel member  20 A is attached becomes the inner surface, thereby forming the barrel portion  20   
     (a6) A step of forming the bottom portion  22  by causing the lower ends  22   h  and  22   i  of the bottom member  22 A and the lower end  20   c  side of the barrel portion  20  to be adhered to each other throughout the entire circumference of the barrel portion  20   
     Step (a1): 
     As illustrated in  FIG.  4 A , the laminated body  40  is formed by laminating the bottom member  22 A and the adhesive film  24  such that both the side ends  24   d  and  24   e  and the side ends  24   f  and  24   g  of the adhesive film  24  respectively protrude in the width direction from both the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A. When the bottom member  22 A has the sealant layer, the sealant layer of the bottom member  22 A are laminated to face the adhesive film  24  side. 
     In step (a1), it is preferable that the laminated body  40  be formed by causing the bottom member  22 A and the adhesive film  24  to be partially adhered to each other along both the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A, respectively. In this manner, when the laminated body  40  is formed, control of the positional relationship between the bottom member  22 A and the adhesive film  24  is further facilitated. Even if the size is small, it is possible to more stably obtain the spout-equipped packaging bag  1  in which leakage of contents is inhibited. 
     The bottom member  22 A and the adhesive film  24  may be adhered to each other through heat-sealing and may be adhered to each other by another method using an adhesive or the like. 
     Step (a2): 
     Next, as illustrated in  FIG.  4 A , the laminated body  40  is folded in half along the bend line  40   a  extending in the width direction such that the adhesive film  24  is on the outer side. 
     The bend line  40   a  of the laminated body  40  extending in the width direction coincides with the bend line  22   a  of the bottom member  22 A and the bend line  24   a  of the laminated film. In the bottom member  22 A of the laminated body  40  folded in half, the bend line  22   a  folded in half is caused to be the upper end, the side end  22   d  of the first bottom surface portion  22   b  and the side end  22   e  of the second bottom surface portion  22   c  are caused to coincide with each other, the side end  22   f  of the first bottom surface portion  22   b  and the side end  22   g  of the second bottom surface portion  22   c  are caused to coincide with each other, and the lower end  22   h  of the first bottom surface portion  22   b  and the lower end  22   i  of the second bottom surface portion  22   c  are caused to coincide with each other. In the adhesive film  24  of the laminated body  40  folded in half as well, the bend line  24   a  folded in half is caused to be the upper end, the side end  24   d  of the first flat surface portion  24   b  and the side end  24   e  of the second flat surface portion  24   c  are caused to coincide with each other, the side end  24   f  of the first flat surface portion  24   b  and the side end  24   g  of the second flat surface portion  24   c  are caused to coincide with each other, and the lower end  24   h  of the first flat surface portion  24   b  and the lower end  24   i  of the second flat surface portion  24   c  are caused to coincide with each other. 
     Step (a3): 
     Next, as illustrated in  FIG.  4 B , the laminated body  40  folded in half is mounted on the sealant layer of the rectangular barrel member  20 A. At this time, it is preferable that a side opposing the bend line  40   a  in the laminated body  40 , that is, the lower ends  22   h  and  22   i  of the bottom member  22 A and the lower ends  24   h  and  24   i  of the adhesive film  24  when the spout-equipped packaging bag  1  is realized coincide with the lower end  20   c  of the barrel member  20 A when the spout-equipped packaging bag  1  is realized. In addition, in this example, in the laminated body  40 , the side ends  22   d  and  22   e  of the bottom member  22 A are caused to be positioned in the part  21 B on the side end  20   a  side from the bend line L 1  on which the barrel member  20 A is bent. Similarly, the side ends  22   f  and  22   g  of the bottom member  22 A are disposed to be positioned in the part  21 C on the side end  20   b  side from the bend line L 2  on which the barrel member  20 A is bent. 
     When the laminated body  40  is disposed on the barrel member  20 A, the barrel member  20 A and the laminated body  40  may be temporarily adhered to each other. It is preferable that the position for temporary adhesion be a position overlapping any of the heat-seal portions HS 1 , HS 2 , and HS 4  formed afterward. 
     Step (a4): 
     As illustrated in  FIG.  43   , the heat-seal portion HS 1  is formed by performing heat-sealing between the laminated body  40  and the barrel member  20 A in the part  21 B of the barrel member  20 A beyond the upper end of the bottom member  22 A such that all the side ends  22   d  and  22   e  of the bottom member  22 A are included from the bend line  22   a  to the lower ends  22   h  and  22   i . In the heat-seal portion HS 1 , the adhesive film  24  and the bottom member  22 A are adhered to each other, the adhesive film  24  and the part  21 B of the barrel member  20 A are adhered to each other, and parts of the adhesive film  24  protruding from the bottom member  22 A are adhered to each other. Accordingly, the side ends  22   d  and  22   e  of the bottom member  22 A are closed by the adhesive film  24  and are attached to a part on the sealant layer of the part  21 B of the barrel member  20 A through adhesion. The surface of the barrel member  20 A on the sealant layer side becomes the inner surface of the barrel portion  20  when the spout-equipped packaging bag  1  is realized. Since the base material layers are contacted to each other, the side ends  22   d  and  22   e  of the bottom member  22 A are not adhered to each other. 
     Similarly, the heat-seal portion HS 2  is formed by performing heat-sealing between the laminated body  40  and the barrel member  20 A in the part  21 C of the barrel member  20 A beyond the upper end of the bottom member  22 A such that all the side ends  22   f  and  22   g  of the bottom member  22 A are included from the bend line  22   a  to the lower ends  22   h  and  22   i . In the heat-seal portion HS 2 , the adhesive film  24  and the bottom member  22 A are adhered to each other, the adhesive film  24  and the part  21 C of the barrel member  20 A are adhered to each other, and parts of the adhesive film  24  protruding from the bottom member  22 A are adhered to each other. Accordingly, the side ends  22   f  and  22   g  of the bottom member  22 A are closed by the adhesive film  24  and are attached to a part on the sealant layer of the part  21 C of the barrel member  20 A through adhesion. The surface of the barrel member  20 A on the sealant layer side becomes the inner surface of the barrel portion  20  when the spout-equipped packaging bag  1  is realized. Since the base material layers are adhered to each other, the side ends  22   f  and  22   g  of the bottom member  22 A are not adhered to each other. 
     Step (a5): 
     The side end  20   a  side and the side end  20   b  side of the barrel member  20 A are bent together with the bottom member  22 A and the side end side of the adhesive film  24  along the bend lines L 1  and L 2  positioned on the middle side from both the side ends  22   d  and  22   e  and the side ends  22   f  and  22   g  of the bottom member  22 A such that the surface to which the bottom member  22 A of the barrel member  20 A is attached becomes the inner surface. As such, they can be easily bent by causing one ends of the heat-seal portions HS 1  and HS 2  in the width direction to coincide with the bend lines L 1  and L 2 . Next, as illustrated in  FIG.  5 A , the side end  20   a  and the side end  20   b  are caused to abut each other, the adhesive film  26  overlaps the inner surfaces thereof, and the heat-seal portion HS 3  is formed through heat-sealing, thereby forming the back joint  25 . Accordingly, the tubular barrel portion  20  is formed. 
     Step (a6): 
     The bottom portion  22  is formed by performing heat-sealing between the lower ends  22   h  and  22   i  of the bottom member  22 A and the lower end  20   c  side of the barrel portion  20  throughout the entire circumference of the barrel portion  20  to realize the heat-scale portion HS 4 . As illustrated in  FIG.  6 A , in the stepped part in a region c in which the side end.  22   d  and  22   e  of the bottom member  22 A are positioned in the heat-seal portion HS 4 , in order to enhance the effect of inhibiting an adhesive failure, it is preferable to perform point sealing which is sealing stronger than heat-sealing of the heat-seal portion HS 4 , in addition to heat-sealing of the heat-seal portion HS 4 . Similarly, in the stepped part in a region in which the side ends  22   f  and  22   g  of the bottom member  22 A are positioned in the heat-seal portion HS 4  as well, in order to enhance the effect of inhibiting an adhesive failure, it is preferable to perform point sealing, in addition to heat-sealing of the heat-seal portion HS 4 . 
     (Step (b)) 
     For example, step (b) can be performed through the following steps (b1) to (b5). 
     (b1) The cut-out portion  19  is formed in the first part  21   a  and the third part  21   c  in the upper end part  21  of the barrel portion  20  of the bag body  10  obtained in step (a), that is, the front surface portion  28  and the rear surface portion  30  of the bag body  10  in a flat state, and the ruled lines  48  and  49  constituted of recessed bars for assisting folding of the upper end part  21  are formed on the front surface portion  28  and the rear surface portion  30  of the bag body  10  in a flat state. 
     (b2) The flange portion  16  of the spout  12  is inserted into the upper portion of the barrel portion  20  through the opening of the bag body  10  on the upper side, and the first part  21   a  of the upper end part  21  of the barrel portion  20  is bent along the first side  16   a  of the flange portion  16  and is heat-sealed to the upper surface  16   e  of the flange portion  16 . 
     (b3) The third part  21   c  of the upper end part  21  of the barrel portion  20  is bent along the third side  16   c  of the flange portion  16  and is heat-sealed to the upper surface  16   e  of the flange portion  16 . 
     (b4) The second part  21   b  and the fourth part  21   d  of the upper end part  21  of the barrel portion  20  are bent along the second side  16   b  and the fourth side  16   d  of the flange portion  16  respectively and are heat-sealed to the upper surface  16   e  of the flange portion  16 . 
     (b5) Heat-sealing is performed again with respect to the upper end part  21  of the barrel portion  20  in its entirety in a state of being folded on the upper surface  16   e  of the flange portion  16 . 
     Step (b1): 
     As illustrated in  FIGS.  8  and  9   , the semicircular cut-out portion  19  is formed such that the position of the nozzle portion  14  corresponds thereto when the spout  12  is attached to both the first part  21   a  and the third part  21   c  in the upper end part  21  of the barrel portion  20  of the bag body  10  obtained through step (a). The method for forming the cut-out portion  19  by partially cutting out the upper end part  21  of the barrel portion  20  is not particularly limited, and a known method can be utilized. 
     In addition, the ruled lines  48  and  49  constituted of recessed bars for assisting the upper end part  21  are formed in parts which are bent when the upper end part  21  is folded on the upper surface  16   e  of the flange portion  16  of the spout  12  in the front surface portion  28  and the rear surface portion  30  of the bag body  10  in a flat state. 
     The ruled line  48  is formed in the upper portion of the front surface portion  28  and has the first ruled line  48   a , second ruled lines  48   b  and  48   b , third ruled lines  48   c  and  48   c , fourth ruled lines  48   d  and  48   d , and a fifth ruled line  48   e . The first ruled line  48   a  is a line for assisting bending along the first side  16   a  of the flange portion  16  and is formed to extend linearly in the width direction of the front surface portion  28 . The length of the first ruled line  48   a  is equivalent to the length of the first side  16   a  of the flange portion  16 , and the middle of the first ruled line  48   a  coincides with the middle of the width direction of the front surface portion  28 . The second ruled lines  48   b  and  48   b  are lines for assisting bending of the first part  21   a  of the upper end part  21  in a trapezoidal shape and are formed linearly to the upper edge of the front surface portion  28  by being inclined from both ends of the first ruled line  48   a  toward the middle side in the width direction. Third ruled lines  48   c  and  48   c  are lines for assisting bending of the second part  21   b  and the fourth pan  21   d  of the upper end part  21  in a trapezoidal shape and are formed linearly to the upper edge of the front surface portion  28  by being inclined from both ends of the first ruled line  48   a  toward the side end side. The fourth ruled lines  48   d  and  48   d  are formed to the side edges  23   a  and  23   b  of the front surface portion  28  by being inclined downward from both ends of the first ruled line  48   a . The fifth ruled line  48   e  is formed linearly in the width direction such that the lower ends of two fourth ruled lines  48   d  and  48   d  are connected to each other. 
     The ruled line  49  is formed in the upper portion of the rear surface portion  30  into a shape similar to that of the ruled line  48  and has a first ruled line  49   a , second ruled lines  49   b  and  49   b , third ruled lines  49   c  and  49   c , fourth ruled lines  49   d  and  49   d , and a fifth ruled line  49   e . The first ruled line  49   a  is a line for assisting bending along the third side  16   c  of the flange portion  16  and is formed to extend linearly in the width direction of the rear surface portion  30 . The length of the first ruled line  49   a  is equivalent to the length of the third side  16   c  of the flange portion  16 , and the middle of the first ruled line  49   a  coincides with the middle of the rear surface portion  30  in the width direction. 
     The second ruled lines  49   b  and  49   b  are lines for assisting bending of the third part  21   c  of the upper end part  21  into a trapezoidal shape and are formed linearly to the upper edge of the rear surface portion  30  by being inclined from both ends of the first ruled line  49   a  toward the middle side in the width direction. The third ruled lines  49   c  and  49   c  are lines for assisting bending of the second part  21   b  and the fourth part  21   d  of the upper end part  21  into a trapezoidal shape and are formed linearly to the upper edge of the rear surface portion  30  by being inclined from both ends of the first ruled line  49   a  toward the side end side. The fourth ruled lines  49   d  and  49   d  are formed to the side edges  23   a  and  23   b  by being inclined downward from both ends of the first ruled line  49   a . The fifth ruled line  49   e  is formed linearly in the width direction such that the lower ends of two fourth ruled lines  49   d  and  49   d  are connected to each other. However, it is not used for folding in the manufacturing method of the present embodiment. 
     The method for forming the ruled lines  48  and  49  is not particularly limited. Examples thereof include a method in which a cutter is pressed against a surface of the barrel member  20 A. The ruled lines  48  and  49  may be formed on the inner surface of the barrel portion  20  or may formed on the outer surface. 
     Step (b2): 
     The flange portion  16  is inserted into an opening between the front surface portion  28  and the rear surface portion  30  of the barrel portion  20  from the upper portion of the bag body  10  while having the nozzle portion  14  of the spout  12  on the front surface portion  28  side and the first side  16   a  (long side of the flange portion  16 ) as the distal end. The flange portion  16  is inserted by performing positioning such that the position of the cut-out portion  19  matches the position of the nozzle portion  14  of the spout  12 , and the first side  16   a  matches the first ruled line  48   a . Thereafter, the base overlaps the first side  16   a , and the heat-seal portion HS 5   a  is formed by heat-sealing the first part  21   a  of the barrel portion  20  to the upper surface  16   e  of the flange portion  16  such that the shape in plan view becomes an isosceles trapezoid except for the cut-out portion  19  while having the second ruled lines  48   b  and  48   b  as oblique sides. 
     After the heat-seal portion HS 5   a  is formed, the upper portion of the barrel portion  20  is bent utilizing the fourth ruled lines  48   d .  48   d ,  49   d , and  49   d  and the fifth ruled line  48   e  such that triangular parts  27   a  and  27   b  are formed on the second side  16   b  side and the fourth side  16   d  side of the flange portion  16  of the spout  12 . 
     That is, the flange portion  16  is moved in a direction of the lower portion of the bag body  10  while holding up the flange portion  16  on the front surface portion  28  side. As illustrated in  FIG.  10 A , a bend line  51   a  is formed by folding the fifth ruled line  48   e  downward and folding the first ruled line  48   a  upward. In addition, the second ruled lines  48   b  and  48   b  are also folded downward during this movement to form bend lines  51   b  and  51   b , the third ruled lines  48   c  and  48   c  are also folded upward to form bend lines  51   c  and  51   c , and the fourth ruled lines  48   d  and  48   d  are folded upward to form bend lines  51   d  and  51   d . In this manner, when the flange portion  16  is moved in a direction of the lower portion of the bag body  10  while holding up the flange portion  16  on the front surface portion  28  side, all the first to fifth ruled lines of the front surface portion  28  are bent. 
     The barrel portion  20  of the spout-equipped packaging bag  1  illustrated in  FIG.  10 A  is in a state of being folded into a flat shape. In the spout  12 , the flange portion  16  is in a state of being disposed to be parallel to the front surface portion  28  and the rear surface portion  30  of the barrel portion  20 . Hereinafter, the same applies to  FIGS.  10 B,  11 , and  12   . 
     Step (b3): 
     As indicated with an arrow in  FIG.  10 A , the third part  21   c  of the upper end part  21  of the barrel portion  20  is bent along the third side  16   c  of the flange portion  16  utilizing the first ruled line  49   a  of the rear surface portion  30  and is further bent utilizing the second ruled lines  49   b  and  49   b  such that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS 5   c  is formed by heat-sealing the third part  21   c  to the upper surface  16   e  of the flange portion  16 . A bend line  53   a  bent along the third side  16   c  of the flange portion  16  in the third part  21   c  of the upper end part  21  coincides with the first ruled line  49   a . In addition, inclined bend lines  53   b  and  53   b  of the third part  21   c  bent into a trapezoidal shape coincide with the second ruled lines  49   b  and  49   b.    
     Step (b4): 
     The second part  21   b  of the upper end pan  21  of the barrel portion  20  is bent along the second side  16   b  of the flange portion  16  such that a portion of the second part  21   b  overlaps the first part  21   a  and the third part  21   c  and is further bent utilizing the third ruled lines  48   c  and  49   c  such that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS 5   b  is formed by heat-sealing the second pan  21   b  to the upper surface  16   e  of the flange portion  16 . Similarly, the fourth part  21   d  of the upper end part  21  of the barrel member  20 A is bent along the fourth side  16   d  of the flange portion  16  such that a portion of the fourth part  21   d  overlaps the first part  21   a  and the third part  21   c  and is further bent utilizing the fourth ruled lines  48   d  and  49   d  such that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS 5   d  is formed by heat-sealing the fourth part  21   d  to the upper surface  16   e  of the flange portion  16 . The inclined bend lines  51   c  and  53   c  of the second part  21   b  bent into a trapezoidal shape coincide with the third ruled lines  48   c  and  49   c . The inclined bend lines  51   c  and  53   c  of the fourth part  21   d  bent into a trapezoidal shape coincide with the third ruled lines  48   c  and  49   c.    
     Regarding adhesion of the second part  21   b  of the upper end part  21  of the barrel portion  20  to the upper surface  16   e  of the flange portion  16  and adhesion of the fourth part  21   d  of the upper end part  21  of the barrel portion  20  to the upper surface  16   e  of the flange portion  16 , either may be performed first or they may be performed at the same time. 
     In steps (b2) to (b4), the upper end part  21  of the tubular barrel portion  20  is liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  in the spout  12  in a folded state, thereby obtaining the spout-equipped packaging bag  1  in which the spout  12  is attached to the upper portion of the bag body  10 . 
     Step (b5): 
     Heat-sealing is performed again with respect to the upper end part  21  of the barrel portion  20  in its entirety in a state of being folded on the upper surface  16   e  of the flange portion  16 . Accordingly, the upper end part  21  of the tubular barrel portion  20  is reliably liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  in the spout  12  in a folded state. 
     In the manufacturing method for a spout-equipped packaging bag of the present invention, as in the flange portion  16  of the present embodiment in which the shape in plan view is substantially a rectangular shape, when the shape of the flange portion of the spout in plan view is substantially a polygonal shape, it is preferable that an operation in which a portion of the upper end part of the barrel member is bent along one side of the flange portion and is adhered to the upper surface of the flange portion be repetitively performed for each of the sides and the upper end part of the barrel member in its entirety be liquid-tightly adhered to the upper surface of the flange portion. Accordingly, manufacturing of the spout-equipped packaging bag is facilitated. 
     It is preferable that the number of times of folding the upper end part of the barrel member be the same as the number of sides of the flange portion. 
     In addition, in the present invention, as in the foregoing spout-equipped packaging bag  1 , it is more preferable that after respective pans of the upper end part of the barrel member are bent along every other side of a plurality of sides of the flange portion and are adhered to the upper surface of the flange portion, the remaining parts of the upper end part of the barrel member be bent along the remaining sides of the flange portion and be adhered to the upper surface of the flange portion. 
     According to the manufacturing method for a spout-equipped packaging bag of the present invention, it is possible to obtain a spout-equipped packaging bag in which the upper end part of the tubular barrel portion of the bag body follows the shape of the flange portion in plan view to be in the same shape, sufficient self-standing properties can be ensured even when the amount of contents decreases, and discomfort when in use is reduced. 
     The manufacturing method for a spout-equipped packaging bag of the present invention is not limited to the manufacturing method for the foregoing spout-equipped packaging bag  1 . 
     For example, as long as the method is within a range in which the upper end part  21  of the tubular barrel portion  20  can be liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  in the spout  12 , a method in which step (b5) is not performed may be adopted. 
     When the shape of the flange portion of the spout in plan view is substantially a polygonal shape, the manufacturing method for a spout-equipped packaging bag of the present invention may be a method (which will hereinafter be referred to as a method (α)) in which the order of forming the heat-seal portion in steps (b3) and (b4) described above is changed, and after a portion of the upper end part of the barrel portion is bent along one side of the plurality of sides of the flange portion and is adhered to the upper surface of the flange portion, respective parts of the upper end pan of the barrel member are bent along respective sides of the flange portion and are adhered to the upper surface of the flange portion in a sequential order of moving round in one direction in plan view. 
     Regarding the method (α), for example, when the spout  12  is used, the upper end part  21  of the tubular barrel portion  20  may be folded and be liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  as follows. Specifically, similar to step (b2) described above, the heat-seal portion HS 5   a  is formed as illustrated in  FIG.  11 A . Next, it is folded in a direction of the arrow in  FIG.  11 A . Then, as illustrated in  FIG.  118   , the second part  21   b  of the upper end part  21  of the barrel portion  20  is bent along the second side  16   b  of the flange portion  16  such that a portion of the second part  21   b  overlaps the first part  21   a . The second part  21   b  is bent utilizing the third ruled lines  48   c  and  49   c  such that the shape in plan view becomes a trapezoidal shape. The heat-seal portion HS 5   b  is formed by heat-sealing the second part  21   b  to the upper surface  16   c  of the flange portion  16 . Next, it is folded in a direction of the arrow in  FIG.  11 B . Then, as illustrated in  FIG.  11 C , the third part  21   c  of the upper end part  21  of the barrel portion  20  is bent along the third side  16   c  of the flange portion  16  such that a portion of the third part  21   c  overlaps the second part  21   b  utilizing the first ruled line  49   a . The third part  21   c  is bent utilizing the second ruled lines  49   b  and  49   b  such that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS 5   c  is formed by heat-scaling the third part  21   c  to the upper surface  16   e  of the flange portion  16 . Next, it is folded in a direction of the arrow in  FIG.  11 C . Then, the fourth part  21   d  of the upper end part  21  of the barrel portion  20  is bent along the fourth side  16   d  of the flange portion  16  such that a portion of the fourth part  21   d  overlaps the third pan  21   c . The fourth part  21   d  is bent utilizing the third ruled lines  48   c  and  49   c  such that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS 5   d  is formed by heat-sealing the fourth part  21   d  to the upper surface  16   e  of the flange portion  16 . 
     In addition, the manufacturing method for a spout-equipped packaging bag of the present invention may be a method (which will hereinafter be referred to as a method (β) in which the order of forming the heat-seal portion in steps (b3) and (b4) described above is changed, and after a portion of the upper end part of the barrel portion is bent along one side of the plurality of sides of the flange portion and is adhered to the upper surface of the flange portion, respective parts of the upper end part of the barrel portion are bent along respective sides of the flange portion and are adhered to the upper surface of the flange portion in order of moving halfway round respectively in both directions in plan view. 
     Regarding the method (β), for example, when the spout  12  is used, the upper end part  21  of the tubular barrel portion  20  may be folded and be liquid-tightly adhered to the upper surface  16   e  of the flange portion  16  as follows. Specifically, similar to step (b2) described above, the heat-seal portion HS 5   a  is formed as illustrated in  FIG.  12 A . Next, it is folded in directions of two arrows in  FIG.  12 A . Then, as illustrated in  FIG.  12 B , the second part  21   b  of the upper end part  21  of the barrel portion  20  is bent along the second side  16   b  of the flange portion  16  such that a portion of the second part  21   b  overlaps the first part  21   a . The second part  21   b  is bent utilizing the third ruled lines  48   c  and  49   c  such that the shape in plan view becomes a trapezoidal shape. The heat-seal portion HS 5   b  is formed by heat-sealing the second part  21   b  to the upper surface  16   e  of the flange portion  16 . In addition, the fourth part  21   d  of the upper end part  21  of the barrel portion  20  is bent along the fourth side  16   d  of the flange portion  16  such that a portion of the fourth part  21   d  overlaps the first part  21   a . The fourth part  21   d  is bent utilizing the third ruled lines  48   c  and  49   c  such that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS 5   d  is formed by heat-sealing the fourth part  21   d  to the upper surface  16   e  of the flange portion  16 . Next, it is folded in a direction of the arrow in  FIG.  12 B . Then, the third part  21   c  of the upper end part  21  of the barrel portion  20  is bent along the third side  16   c  of the flange portion  16  such that a portion of the third part  21   c  overlaps the second part  21   b  and the fourth part  21   d  utilizing the first ruled line  49   a . The heat-seal portion HS 5   c  is formed by heat-sealing the third part  21   c  to the upper surface  16   e  of the flange portion  16  such that the shape in plan view becomes a trapezoidal shape utilizing the second ruled lines  49   b  and  49   b.    
     The spout-equipped packaging bag manufactured through steps (b2) to (b4) described above is preferable in terms of favorable appearance due to line-symmetric overlapping of the first part  21   a  to the fourth part  21   d  with respect to axes extending in the width direction and the depth direction about the spout  12 , and from the viewpoint that concentration of warpage or the occurrence of wrinkles in parts of the upper end part of the barrel portion bent lastly is easily inhibited, and the upper end part of the tubular barrel portion is easily liquid-tightly adhered to the upper surface of the flange portion of the spout in a folded state. 
     In addition, in comparison between the method (α) and the method (β), the method (β) is more preferable than the method (α), from the viewpoint that concentration of warpage or the occurrence of wrinkles in parts of the upper end part of the barrel portion bent lastly is easily inhibited, and the upper end part of the tubular barrel portion is easily liquid-tightly adhered to the upper surface of the flange portion of the spout in a folded state. 
     In the manufacturing method for the spout-equipped packaging bag  1 , the upper end part  21  of the tubular barrel portion  20  starts to be folded from the first part  21   a . However, the position in the upper end part  21  where folding starts is not particularly limited. 
     The way of folding the upper end part of the tubular barrel portion is not limited to folding on the ruled lines  48  and  49  illustrated in  FIGS.  8  and  9   , and the upper end part need only be liquid-tightly adhered thereto. 
     In addition, even when ruled lines are formed, the shapes of the ruled lines  48  and  49  are not limited. In the spout-equipped packaging bag of the present invention, for example, the upper end part  21  of the barrel portion  20  may be folded utilizing ruled lines  48 A and  49 A illustrated in  FIGS.  16  and  17    as an example, and the upper end part  21  of the barrel portion  20  may follow the shape of the flange portion  16  in plan view to be in the same shape. 
     The ruled line  48 A is the same as the ruled line  48  except for having sixth ruled lines  48   f  and seventh ruled lines  48   g  in place of the second ruled lines  48   b , the third ruled lines  48   c , and the fourth ruled lines  48   d  described above. 
     The sixth ruled lines  48   f  and  48   f  extend linearly from the edges of the cut-out portion  19  on both sides to the side edges  23   a  and  23   b  of the front surface portion  28  through both ends of the first ruled line  48   a  and correspond to the legs of the trapezoid in the trapezoidal heat-seal portion HS 5   a  to which the first pan  21   a  is heat-sealed. The seventh ruled lines  48   g  and  48   g  extend from both ends of the first ruled line  48   a  to the upper edge of the front surface portion  28  while being parallel to the side edges  23   a  and  23   b . In this case, the bend lines of the seventh ruled lines  48   g  and  48   g  overlap the bend line  51   a.    
     The ruled line  49 A is the same as the ruled line  49  except for having sixth ruled lines  49   f  and seventh ruled line  49   g  in place of the second ruled line  49   b , the third ruled line  49   c , and the fourth ruled line  49   d  described above. 
     The sixth ruled lines  49   f  and  49   f  extends linearly from the edges of the cut-out portion  19  on both sides to the side edges  23   a  and  23   b  of the rear surface portion  30  through both ends of the first ruled line  49   a  and correspond to legs of the trapezoid in the trapezoidal heat-seal portion HS 5   c  to which the third part  21   c  is heat-sealed. The seventh ruled lines  49   g  and  49   g  extend from both ends of the first ruled line  49   a  to the upper edge of the rear surface portion  30  while being parallel to the side edges  23   a  and  23   b . In this case, the bend lines of the seventh ruled lines  49   g  and  49   g  overlap the bend line  53   a.    
     When the front surface portion  28  has the seventh ruled lines  48   g  and  48   g  and the rear surface portion  30  has the seventh ruled lines  49   g  and  49   g , the shapes of the heat-seal portion HS 5   b  to which the second part  21   b  is heat-sealed and the heat-seal portion HS 5   d  to which the fourth part  21   d  is heat-sealed become rectangular shapes instead of trapezoidal shapes. 
     Even in a case where the shape of the flange portion of the spout in plan view is a circular shape, similar to the case where the shape of the flange portion in plan view is substantially a polygonal shape, the entire upper end part of the barrel portion can be liquid-tightly adhered to the upper surface of the flange portion by repeating an operation in which the upper end part of the barrel portion is partially bent and is adhered to the upper surface of the flange portion. In this case, the number of times of folding the upper end part of the tubular barrel portion is not particularly limited and may be suitably set in accordance with the size and the like of the flange portion. 
     INDUSTRIAL APPLICABILITY 
     According to the present invention, it is possible to provide a spout-equipped packaging bag in which sufficient self-standing properties can be ensured even when the amount of contents decreases and discomfort when in use is reduced, a manufacturing method therefor, and a spout-equipped packaging bag that contains contents. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  Spout-equipped packaging bag 
               10  Bag body 
               12  Spout 
               14  Nozzle portion 
               16  Flange portion 
               16   a  First side 
               16   b  Second side 
               16   c  Third side 
               16   d  Fourth side 
               16   e  Upper surface 
               18  Cap portion 
               20  Barrel portion 
               20 A Barrel member 
               21  upper end part 
               21   a  First part 
               21   b  Second part 
               21   c  Third part 
               21   d  Fourth part 
               22  Bottom portion 
               22 A Bottom member 
               22   a  Bend line 
               24 ,  26  Adhesive film 
               28  Front surface portion 
               30  Rear surface portion 
               40  Laminated body 
               48 ,  49  Ruled line