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

The present invention is a self-standing spout-equipped packaging bag (1), including a bag body (10) that stores contents, and a spout (12) that is attached to an upper portion of the bag body (10). The bag body (10) includes a tubular barrel portion (20), and a bottom portion (22) which is attached to block an opening end of a lower part of the barrel portion (20). The spout (12) includes a tubular nozzle portion (14), and a flange portion (16) which projects from an outer surface of the nozzle portion (14). An upper end part (21) of the tubular barrel portion (20) over an entire circumference is liquid-tightly adhered to an upper surface (16e) of the flange portion (16) in a state of following a shape of the flange portion (16) in plan view to be in the same shape.

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

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.

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.

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 inFIG.1, a spout-equipped packaging bag1of the present embodiment includes a bag body10that stores contents, and a spout12that is attached to the upper portion of the bag body10.

The spout12is a member for discharging contents stored in the bag body10to the outside. As illustrated inFIGS.2A and2B, the spout12includes a tubular nozzle portion14, a flange portion16which projects from a lower end on an outer surface14aof the nozzle portion14, and a cap portion18which is mounted such that an opening end14bof the nozzle portion14on the upper side is blocked.

The spout12is provided in the upper portion of the bag body10such that the axial direction of the nozzle portion14becomes the up-down direction. In the outer surface14aof the nozzle portion14, a first engagement projection15of a protrusion is provided to protrude radially outward and extend spirally. On an inner surface18aof a side wall of the cap portion18, a second engagement projection17of a protrusion is provided to protrude radially inward and extend spirally. In the spout12, the cap portion18can be screwed into the nozzle portion14and can be detachably mounted thereon utilizing a screw effect of engagement between the first engagement projection15and the second engagement projection17.

For example, when a beverage is stored inside of the bag body10, a user can drink the beverage by holding a distal end part of the nozzle portion14in the mouth and sucking the beverage after detaching the cap portion18.

The flange portion16has a plate shape and projects from the lower end on the outer surface14aof the nozzle portion14in a direction perpendicular to the axial direction of the nozzle portion14. In the spout12, the nozzle portion14is positioned in a central portion of the flange portion16in 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 portion16in 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 portion16in 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 portion16has four linear sides including a first side16a, a second side16b, a third side16c, and a fourth side16d. The first side16aand the third side16care parallel to each other, and the second side16band the fourth side16dare parallel to each other. The spout12is disposed such that the first side16abecomes the front surface side of the spout-equipped packaging bag1and the third side16cbecomes the rear surface side of the spout-equipped packaging bag1.

The size of the flange portion16in plan view may be suitably set in accordance with the size of the bag body10and the purpose or the like of the spout-equipped packaging bag1. It is preferable that the length of an outer edge of the flange portion16over 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 member20A forming a barrel portion20of the bag body10.

Although it depends on the kind of a synthetic resin to be used, the thickness of the flange portion16is 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 portion16is 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 spout12, it is preferable that at least a part of the flange portion16which is adhered to an inner surface of the bag body10be 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 spout12may 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 portion16in the spout12which is adhered to the inner surface of the bag body10, 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 body10on the inner surface side.

As illustrated inFIG.1, the bag body10includes the tubular barrel portion20, and a bottom portion22which is attached to block the opening end of a lower part of the barrel portion20.

The barrel portion20is formed by causing the rectangular barrel member20A to be in a tubular shape. It is preferable that the barrel member20A 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 portion20serves 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 member20A may be a single-layer film constituted of a heat-sealable film.

In the present embodiment, both side end sides of the rectangular barrel member20A are bent along bend lines L1and L2indicated inFIG.4B. As illustrated inFIGS.1and3, a folded back side end20aand a folded back side end20bof the barrel member20A are caused to abut each other and form a tubular shape. In the barrel portion20, a part21A (refer toFIG.4B) between the bend line L1and the bend line L2of the barrel member20A becomes a part on the front surface side. In the barrel member20A, a part21B between the bend line L1and the side end20a, and a part21C between the bend line L2and the side end20bbecome parts on the rear surface side. Hereinafter, as illustrated inFIG.3, a part of the barrel portion20corresponding to the part21A of the barrel member20A when the bag body10is in a flat state will be referred to as a front surface portion28, and parts of the barrel member20A corresponding to the part21B and the part21C will be referred to as a rear surface portion30.

Here, the bend lines L1and L2of the barrel member20A indicate positions intended to be bent. The bend lines L1and L2of the barrel member20A respectively coincide with side edges23aand23bof the barrel portion20when the bag body10is in a flat state.

In this example, as illustrated inFIGS.1and5A, the side end20aand the side end20bof the barrel member20A are caused to abut each other such that there is no gap therebetween and are heat-sealed in a heat-seal portion HS3in a state where an adhesive film26overlaps the inner surface sides thereof, such that a back joint25is formed and the barrel member20A has a tubular shape. In such a form, the side end20aand the side end20bof the barrel member20A may have a slight gap therebetween or may slightly overlap each other, as long as they are sealed by the adhesive film26with no gap therebetween.

The adhesive film26is 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 film26include 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 film26.

The form of the back joint25is not limited to a form of using the adhesive film26. For example, as illustrated inFIG.5B, an envelope joint in which the inner surface of the side end20aand the outer surface of the side end20bin the barrel member20A are adhered to each other may be adopted, or as illustrated inFIG.5C, a butt joint in which the inner surfaces of the side end20aand the side end20bof the barrel member20A are adhered to each other may be adopted. An envelope joint or a butt joint of the side end20aand the side end20bmay be realized through heat-sealing or may be realized using an adhesive.

In the spout-equipped packaging bag1, the bag body10and the spout12are adhered to each other as follows, and an upper end part21of the tubular barrel portion20of the bag body10is in a state of following the shape of the flange portion16in plan view to be in the same shape. In the upper end part21over the entire circumference of the tubular barrel portion20of the bag body10, a portion of the front surface portion28when in a flat shape corresponds to the first side16aof the flange portion16of the spout12. A first part21a(corresponding part) on the front surface side is be inward along the first side16aof the flange portion16and is heat-sealed to an upper surface16eof the flange portion16in a heat-seal portion HS5a. The first part21aof the barrel portion20is heat-sealed to the upper surface16eof the flange portion16in a trapezoidal shape narrowed toward the middle of the flange portion16in a state of being bent along the first side16aof the flange portion16in plan view.

On a distal end side of the first part21aof the barrel portion20, a semicircular cut-out portion19is formed at a position corresponding to the nozzle portion14of the spout12. When the cut-out portion19is not formed, in order to avoid overlapping between the nozzle portion14of the spout12and the first part21a, there is a need to decrease the dimension of the trapezoidal shape of the first part21ain the height direction.

That is, when the cut-out portion19is not formed, them is a need to provide a first ruled line48a(which will be described below) at a position thereabove. When the cut-out portion19is formed, compared to a case where the cut-out portion19is not formed, the area of the first part21aof the barrel portion20adhered to the upper surface16eof the flange portion16of the spout12can 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 part21aof the barrel portion20, in the upper end pan21of the tubular barrel portion20, a portion of the rear surface portion30when in a flat shape corresponds to the third side16cof the flange portion16of the spout12. A third part21c(corresponding part) on the rear surface side is heat-sealed to the upper surface16eof the flange portion16in a heat-seal portion HS5cin a state of being bent along the third side16cof the flange portion16to be in a trapezoidal shape in plan view. On a distal end side of the third part21cof the barrel portion20as well, similar to the distal end side of the first part21aof the barrel portion20, the semicircular cut-out portion19is formed at a position corresponding to the nozzle portion14of the spout12.

In addition, in the upper end part21of the tubular barrel portion20, a second part21b(between the first part21aon the front surface side and the third part21con the rear surface side) corresponding to the second side16bof the flange portion16of the spout12and a fourth part21d(between the third part21con the rear surface side and the first part21aon the front surface side) corresponding to the fourth side16dof the flange portion16are heat-sealed to the upper surface16eof the flange portion16respectively in heat-seal portions HS5band HS5din a state of being bent along the second side16band the fourth side16dof the flange portion16to be in a trapezoidal shape in plan view. Portions of the second part21band the fourth part21din the upper end part21of the barrel portion20overlap the first part21aand the third part21cwhile parts between the first part21aand the third part21c, and the second part21band the fourth part21dare bent to enter locations below the second part21band the fourth part21d, respectively.

As described above, the upper end part21is folded easily and neatly by folding the upper end part21of the tubular barrel portion20such that the first part21ato the fourth part21dform a trapezoidal shape in plan view, and therefore it is easy for the spout12to be liquid-tightly adhered to the upper portion of the barrel portion20.

In the heat-seal portions HS5ato HS5d, the outer surfaces of the barrel member20A are in contact with each other in regions in which the second part21band the fourth part21doverlap the first part21aand the third part21cin the upper end part21of the barrel portion20. 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 member20A 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 member20A 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 part21of the barrel member20A is adhered to the upper surface16eof the flange portion16of the spout12is 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 bag1, the first part21ato the fourth part21din the upper end pan21of the tubular barrel portion20are respectively bent along the first side16ato the fourth side16dof the flange portion16and are liquid-tightly adhered to the upper surface16eof the flange portion16in a state of being folded on the upper surface16eof the flange portion16. Accordingly, the upper end par21of the tubular barrel portion20is in a state of following the shape of the flange portion16in plan view to be in the same shape and in a spread state. In this manner, when the upper end part21of the tubular barrel portion20is liquid-tightly adhered to the upper surface16eof the flange portion16in 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 spout12in the upper portion of the spout-equipped packaging bag1. 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 body10of the spout-equipped packaging bag1, discomfort when the bag body10is held with the hand is further reduced.

As illustrated inFIGS.3and4, the bottom portion22of the bag body10is formed while being adhered to a part below inside of the barrel portion20such that the opening end of the tubular barrel portion20is blocked while having a bend line22athereof on the side thereabove in a state where a bottom member22A formed of a rectangular film material is folded in half. Accordingly, contents can be stored inside of the bag body10, and the stored contents can be poured out from the spout12.

When contents are stored inside of the bag body10, the bottom portion22is in a state of being forced to spread downward as illustrated inFIG.1. Therefore, the spout-equipped packaging bag1can stand by itself. When contents are stored inside of the bag body10, the bottom portion22of the bag body10has a circular shape or substantially an oval shape when viewed from below, and it may have obtuse corner portions.

As illustrated inFIG.4A, a surface of the bottom member22A folded in half is divided into a first bottom surface portion22band a second bottom surface portion22cby the bend line22aas a border. In a state of being folded in half, a side end22dof the first bottom surface portion22band a side end22of the second bottom surface portion22ccoincide with each other, a side end22fof the first bottom surface portion22band a side end22gof the second bottom surface portion22ccoincide with each other, and a lower end22hof the first bottom surface portion22band a lower end22iof the second bottom surface portion22ccoincide with each other. In the bottom portion22, each of the side ends22dand22eand the side ends22fand22gof the bottom member22A is adhered to the inner surface of the barrel portion20, and the lower ends22hand22iof the bottom member22A are adhered to a lower end20cof the barrel portion20throughout the entire circumference of the barrel portion20.

As illustrated inFIG.4B, in a process of manufacturing the spout-equipped packaging bag1, the bottom member22A in a state of being folded in half is disposed on the barrel member20A such that a centerline a of the bottom member22A in the width direction and a centerline b of the barrel member20A in the width direction substantially coincide with each other while having the second bottom surface portion22con the barrel member20A side. In the spout-equipped packaging bag1, the second bottom surface portion22cfaces the front surface portion28of the barrel portion20, and the first bottom surface portion22bfaces the rear surface portion30of the barrel portion20.

A length D1between both side ends of the bottom member22A folded in half is larger than the width between the bend lines L1and L2of the barrel member20A, that is, a width D2of the part21A and exceeds the bend lines L1and L2of the barrel member20A. When the barrel member20A has a tubular shape, the bottom member22A is bent together with the barrel member20A on the bend lines L1and L2of the barrel member20A. That is, the length D1between both side ends of the bottom member22A is larger than the width of the barrel portion20when the bag body10is 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 D1between both side ends of the bottom member22A is larger than the width of the barrel portion20, as illustrated inFIGS.1,3, and6A, the side ends22dand22eside of the bottom member22A folded in half is bent at the side edge23aof the barrel portion20and is attached to the inner surface of the rear surface portion30. Accordingly, in the spout-equipped packaging bag1, since a load of contents is received in a part bent together with the barrel member20A in the bottom member22A instead of the corners at both ends folded in half on the bend line22aof the bottom member22A, a significant force is not concentrated on the side edge of the bottom member22A on the side ends22dand22eside. Therefore, rupture of the bottom member22A is unlikely to occur in parts of the side ends22dand22c, and an effect of inhibiting leakage of contents is high. Similarly, the side ends22fand22gside of the bottom member22A folded in half is bent at the side edge23bof the barrel portion20, and the side ends22fand22gare attached to the inner surface of the rear surface portion30. Accordingly, rupture of the bottom member22A is also unlikely to occur in parts of the side ends22fand22g, 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 ends22dand22eof the bottom member22A and the side edge23aof the barrel portion20, that is, a distance D3between the side ends22dand22eof the bottom member22A and the bend line L1of the barrel member20A is preferably 1.0 mm or longer and is more preferably 3.0 mm or longer. If the distance D3is 1.0 mm or longer, it is easy to inhibit rupture of pans of the side ends22dand22eof the bottom member22A and leakage of contents. If the distance D3has a length to a certain extent, when the spout-equipped packaging bag is filled with contents, as illustrated inFIG.7, positions corresponding to the positions of the side ends22dand22eof the bottom member22A in the barrel member20A become bend lines, such that the barrel member20A is bent and obtuse corner portions29are easily formed on the bottom portion22side of the barrel portion20. 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 distance13to 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 ends22fand22gof the bottom member22A and the side edge23bof the barrel portion20, that is, a distance D4between the side ends22fand22gof the bottom member22A and the bend line L2of the barrel member20A is similar to that of the distance D3.

The distance D3and the distance D4may 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 member22A, it is preferable to use a laminated film in which at least the base material layer and the sealant layer are laminated. The bottom member22A 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 portion20inside of the bag body10is the sealant layer. Examples of the base material layer and the sealant layer of the bottom member22A can be the same as the examples of the base material layer and the sealant layer in the barrel member20A. In addition, when the bottom member22A is a laminated film, it may have an intermediate layer. Examples of the intermediate layer of the bottom member22A can be the same as the examples of the intermediate layer in the barrel member20A.

The bottom member22A and the barrel member20A 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 inFIGS.3,4A, and4B, on the barrel portion20side in the bottom member22A, that is, on a side inward from the bottom member22A in the bag body10, an adhesive film24for causing the side ends22dand22eand the side ends22fand22gof the bottom member22A to be adhered to the barrel portion20is laminated such that the bottom member22A in its entirety is covered. The side ends22dand22eand the side ends22fand22gof the bottom member22A are adhered to the inner surface of the barrel portion20utilizing the adhesive film24.

The adhesive film24is laminated on a surface of the sealant layer of the bottom member22A. Here, the term “being laminated” may indicate a state where the bottom member22A and the adhesive film24are 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 member22A is interposed between the adhesive films24, both the adhesive film24and the bottom member22A are folded in half on a bend line24a. A surface of the adhesive film24folded in half is divided into a first flat surface portion24band a second flat surface portion24c.

In a state of being folded in half, a side end24dof the first flat surface portion24band a side end24eof the second flat surface portion24ccoincide with each other, a side end24fof the first flat surface portion24band a side end24gof the second flat surface portion24ccoincide with each other, and a lower end24hof the first flat surface portion24band a lower end24iof the second flat surface portion24ccoincide with each other. The second flat surface portion24cof the adhesive film24is positioned on the part21A of the barrel member20A side, that is, on the front surface side of the barrel portion20in the spout-equipped packaging bag1. Meanwhile, the first flat surface portion24bof the adhesive film24is positioned on the rear surface side of the barrel portion20in the spout-equipped packaging bag1.

As illustrated inFIG.4A, the side ends24dand24eon one side in the adhesive film24folded in half protrude in the width direction from the side ends22dand22eon one side in the bottom member22A folded in half. In addition, the side ends24fand24gon the opposite side in the adhesive film24folded in half protrude in the width direction from the side ends22fand22gon the opposite side in the bottom member22A folded in half. In this manner, each of the side ends24dand24eand the side ends24fand24gon both sides in the adhesive film24protrudes in the width direction from the bottom member22A.

In the spout-equipped packaging bag1, as illustrated inFIGS.1,3, and6A, in a state where both the side ends24dand24eside of the adhesive film24and the side ends22dand22eside of the bottom member22A are bent at the side edge23aof the barrel portion20, the adhesive film24, the bottom member22A, and the barrel portion20are adhered to each other through heat-sealing in a heat-seal portion HS1including the side ends22dand22eof the bottom member22A. Specifically, in the heat-seal portion HS1, the adhesive film24and the bottom member22A are adhered to each other, the adhesive film24and a part on the rear surface side of the barrel portion20are adhered to each other, and parts of the adhesive film24protruding from the bottom member22A are adhered to each other. Accordingly, the side ends22dand22eof the bottom member22A are closed by the adhesive film24and are attached to the inner surface of the barrel portion20on the rear surface portion side through adhesion. An end of the heat-seal portion HS1in the height direction is formed beyond the bend line22aof the bottom member22A folded in half. In addition, an end of the heat-seal portion HS1in the width direction will be described below.

Similarly, in a state where both the side ends24fand24gside of the adhesive film24and the side ends22fand22gside of the bottom member22A are bent at the side edge23bof the barrel portion20, the adhesive film24, the bottom member22A, and the barrel portion20are adhered to each other through heat-sealing in a heat-seal portion HS2including the side ends22fand22gof the bottom member22A. Specifically, in the heat-seal portion HS2, the adhesive film24and the bottom member22A are adhered to each other, the adhesive film24and a part on the rear surface side of the barrel portion20are adhered to each other, and parts of the adhesive film24protruding from the bottom member22A are adhered to each other. Accordingly, the side ends22fand22gof the bottom member22A are closed by the adhesive film24and are attached to the inner surface of the barrel portion20on the rear surface side through adhesion. An end of the heat-seal portion HS2in the height direction is formed beyond the bend line22aof the bottom member22A folded in half. In addition, an end of the heat-seal portion HS2in the width direction will be described below.

In the spout-equipped packaging bag1, since both the side ends24dand24eand the side ends24fand24gof the adhesive film24respectively protrude in the width direction from both the side ends22dand22cand the side ends22fand22gof the bottom member22A and there is one adhesive film24, it is easy to control the positional relationship between the bottom member22A and the adhesive film24which are laminated. Accordingly, even if the spout-equipped packaging bag1has a small size, it is easy to inhibit a positional deviation between the bottom member22A and the adhesive film24and the occurrence of an adhesive failure, and therefore it is easy to inhibit leakage of contents regardless of the size.

The adhesive film24is a member having a function of attaching the side ends22dto22gon both sides in the bottom member22A to the inner surface of the barrel portion20through adhesion and is a film of which both surfaces have heat-sealing properties. Regarding the adhesive film24, 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 film26can 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 film26is a synthetic resin film of a single layer, the adhesive film24melts in the heat-seal portion HS1and the heat-seal portion HS2due 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 ends22dand22eof the bottom member22A and a stepped part on the border formed depending on the presence or absence of the side ends22fand22g, and therefore a heat-sealing failure is less likely to occur.

In the spout-equipped packaging bag1in this example, as illustrated inFIG.4B, in the parts21B and21C of the barrel member20A, one end of the heat-seal portion HS1in the width direction is formed to reach the bend line L1, and one end of the heat-seal portion HS2in the width direction is formed to reach the bend line L2. That is, in the rear surface portion30of the barrel portion20, the heat-seal portion HS1is formed to reach the side edge23aof the barrel portion20, and the heat-seal portion HS2is formed to reach the side edge23bof the barrel portion20. In the spout-equipped packaging bag1, it is preferable that a part which is adhered to the adhesive film24in a part of the barrel portion20to which both the side ends22dand22eand the side ends22fand22gof the bottom member22A are attached be only the rear surface portion30without straddling the bend lines L1and L2. That is, it is preferable that the heat-seal portion HS1and the heat-seal portion HS2do not lead to the front surface portion28. Accordingly, the bend line22aof the bottom member22A is in a state of being not fixed to the front surface portion28of the barrel portion20. Therefore, since the upper portion of the bottom portion22easily spreads in the vicinity of the side edges23aand23bof the spout-equipped packaging bag1and parts in the vicinity of the side edges23aand23bof the barrel portion20easily spread in accordance therewith, self-standing stability is improved, and favorable appearance is easily obtained.

When the heat-seal portion HS1and the heat-seal portion HS2are formed in only the rear surface portion, as illustrated inFIG.13, one end of the heat-seal portion HS1in the width direction does not have to lead to the bend line L1, and one end of the heat-seal portion HS2in the width direction does not have to lead to the bend line L2. That is, the heat-seal portion HS1and the heat-seal portion HS2do not have to lead to the side edges23aand23bof the barrel portion20. In this case as well, since the upper portion of the bottom portion22easily spreads in the vicinity of the side edges23aand23bof the spout-equipped packaging bag1and parts in the vicinity of the side edges23aand23bof the barrel portion20easily 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 inFIG.14, a form can be adopted in which one ends of the heat-seal portion HS1and the heat-seal portion HS2in the width direction leads to the part21A of the barrel member20A, that is, the front surface portion of the barrel portion20while straddling the bend line L1and the bend line L2.

The other ends of the heat-seal portions HS1and HS2in the width direction need only be positioned on the side ends20aand20bside of the barrel member20A while respectively straddling the side ends22dand22eand the side ends22fand22gof the bottom member22A. Accordingly, parts of the adhesive film24protruding from the side ends22dand22eof the bottom member22A are adhered to each other, and parts protruding from the side ends22fand22gare adhered to each other. Therefore, a gap between the side end22dand the side end22eof the bottom member22A is closed and a gap between the side end22fand the side end22gis closed.

In addition, the other ends of the heat-seal portions HS1and HS2in the width direction may be respectively positioned on the side ends20aand20bside of the barrel member20A beyond the side ends24dand24cand the side ends24fand24gof the adhesive film24. Accordingly, a gap between the side end24dand the side end24eand a gap between the side end24fand the side end24gare closed. Therefore, contents can be inhibited from entering the gaps therebetween.

In the spout-equipped packaging bag1, as illustrated inFIGS.1,3,6A, and6B, when the lower ends22hand22iof the bottom member22A folded in half and the lower end20cof the barrel member20A in a tubular shape are heat-scaled throughout the entire circumference of the barrel portion20, a belt-shaped heat-seal portion HS4is formed. When the heat-seal portion HS4reaches the lower edge of the barrel portion20, its self-standing properties are improved, which is preferable. Accordingly, the opening end on the side below in the spout-equipped packaging bag1is closed, and the bottom portion22is formed. The width of the belt-shaped heat-seal portion HS4is 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 HS4in the front surface portion28of the barrel portion20is not adhered to the adhesive film24. In addition, the first flat surface portion24band the second flat surface portion24cin the adhesive film24being in contact with each other in a bent state are adhered to each other in the heat-seal portion HS4.

In the spout-equipped packaging bag1, the tubular shape of the bag body10when contents are stored has a circular or substantially oval cross section on the bottom portion22side 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 portion16of the spout12.

In addition, in the bag body10of the spout-equipped packaging bag1, the barrel portion20has a tubular shape with no side seal portion projecting outward in plan view. Therefore, when the bag body10is 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 bag1.

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 portion20, a bag body including a barrel portion50illustrated inFIG.15as an example may be provided. The barrel portion50is constituted of two barrel members50A and50B formed in a tubular shape. The width of the barrel member50A is larger than the width of the barrel member50B. Side end portions of the barrel member50A and the barrel member501on one side and side end portions thereof on the opposite side are scaled to each other, and two side seal portions52are formed in a tubular shape. The width of a part54between two side seal portions52in the barrel member501of the barrel portion50is equivalent to the length of the first side16ain the flange portion16of the spout12. In the barrel portion50, it is preferable that any one or both of two side seal portions52be entirely folded back and be adhered to the part54side or to a side opposite thereto.

Even in a spout-equipped packaging bag using the barrel portion50, the tubular barrel portion constituted of two barrel members50A and50B 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 portion50is 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 bag1is realized in a form in which the adhesive film24is laminated such that the bottom member22A 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 member22A are covered, respectively.

In the spout-equipped packaging bag1, the upper end pan21of the barrel portion20adhered to the upper surface16eof the flange portion16is folded such that portions of the second part21band the fourth part21doverlap the first part21aand the third pan21c. However, the folded form of the upper end part21is not limited to this form. For example, a form in which the upper end part21of the barrel portion20is folded such that portions of the second part21band the fourth part21doverlap the first part21a, and a portion of the third part21coverlaps the second part21band the fourth part21dmay be adopted. In addition, a form in which the upper end part21of the barrel portion20is folded such that a portion of the second part21boverlaps the first part21a, a portion of the third part21coverlaps the second part21b, and a portion of the fourth part21doverlaps the first part21aand the third part21cmay 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.

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 bag1will be described. The manufacturing method for the spout-equipped packaging bag1has the following steps (a) and (b).

(a) A step of attaching the bottom member22A folded in half to a part below inside of the barrel member20A while having the bend line22aabove, and forming the bag body10in which the opening end below the tubular barrel portion20is closed by the bottom portion22

(b) The upper end part21of the tubular barrel portion20is folded on the upper surface16eof the flange portion16in the spout12and 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 spout12is attached to the upper portion of the bag body10.

For example, step (a) can be performed through the following steps (a1) to (a6).

(a1) A step of forming a laminated body40by laminating the bottom member22A and the adhesive film24such that both the side ends24dand24eand the side ends24fand24gof the adhesive film24in the width direction respectively protrude in the width direction from both the side ends22dand22eand the side ends22fand22gof the bottom member22A

(a2) A step of folding the laminated body40in half on a bend line40aextending in the width direction such that the adhesive film24is on the outer side

(a3) A step of mounting the laminated body40folded in half on the rectangular barrel member20A

(a4) A step of attaching the side ends22dand22eand the side ends22fand22gof the bottom member22A to the barrel member20A by means of the adhesive film24

(a5) A step of forming a tubular shape by causing the side ends20aand20bof the barrel member20A to be adhered to each other such that the surface to which the bottom member22A of the barrel member20A is attached becomes the inner surface, thereby forming the barrel portion20

(a6) A step of forming the bottom portion22by causing the lower ends22hand22iof the bottom member22A and the lower end20cside of the barrel portion20to be adhered to each other throughout the entire circumference of the barrel portion20

As illustrated inFIG.4A, the laminated body40is formed by laminating the bottom member22A and the adhesive film24such that both the side ends24dand24eand the side ends24fand24gof the adhesive film24respectively protrude in the width direction from both the side ends22dand22eand the side ends22fand22gof the bottom member22A. When the bottom member22A has the sealant layer, the sealant layer of the bottom member22A are laminated to face the adhesive film24side.

In step (a1), it is preferable that the laminated body40be formed by causing the bottom member22A and the adhesive film24to be partially adhered to each other along both the side ends22dand22eand the side ends22fand22gof the bottom member22A, respectively. In this manner, when the laminated body40is formed, control of the positional relationship between the bottom member22A and the adhesive film24is further facilitated. Even if the size is small, it is possible to more stably obtain the spout-equipped packaging bag1in which leakage of contents is inhibited.

The bottom member22A and the adhesive film24may be adhered to each other through heat-sealing and may be adhered to each other by another method using an adhesive or the like.

Next, as illustrated inFIG.4A, the laminated body40is folded in half along the bend line40aextending in the width direction such that the adhesive film24is on the outer side.

The bend line40aof the laminated body40extending in the width direction coincides with the bend line22aof the bottom member22A and the bend line24aof the laminated film. In the bottom member22A of the laminated body40folded in half, the bend line22afolded in half is caused to be the upper end, the side end22dof the first bottom surface portion22band the side end22eof the second bottom surface portion22care caused to coincide with each other, the side end22fof the first bottom surface portion22band the side end22gof the second bottom surface portion22care caused to coincide with each other, and the lower end22hof the first bottom surface portion22band the lower end22iof the second bottom surface portion22care caused to coincide with each other. In the adhesive film24of the laminated body40folded in half as well, the bend line24afolded in half is caused to be the upper end, the side end24dof the first flat surface portion24band the side end24eof the second flat surface portion24care caused to coincide with each other, the side end24fof the first flat surface portion24band the side end24gof the second flat surface portion24care caused to coincide with each other, and the lower end24hof the first flat surface portion24band the lower end24iof the second flat surface portion24care caused to coincide with each other.

Next, as illustrated inFIG.4B, the laminated body40folded in half is mounted on the sealant layer of the rectangular barrel member20A. At this time, it is preferable that a side opposing the bend line40ain the laminated body40, that is, the lower ends22hand22iof the bottom member22A and the lower ends24hand24iof the adhesive film24when the spout-equipped packaging bag1is realized coincide with the lower end20cof the barrel member20A when the spout-equipped packaging bag1is realized. In addition, in this example, in the laminated body40, the side ends22dand22eof the bottom member22A are caused to be positioned in the part21B on the side end20aside from the bend line L1on which the barrel member20A is bent. Similarly, the side ends22fand22gof the bottom member22A are disposed to be positioned in the part21C on the side end20bside from the bend line L2on which the barrel member20A is bent.

When the laminated body40is disposed on the barrel member20A, the barrel member20A and the laminated body40may 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 HS1, HS2, and HS4formed afterward.

As illustrated inFIG.43, the heat-seal portion HS1is formed by performing heat-sealing between the laminated body40and the barrel member20A in the part21B of the barrel member20A beyond the upper end of the bottom member22A such that all the side ends22dand22eof the bottom member22A are included from the bend line22ato the lower ends22hand22i. In the heat-seal portion HS1, the adhesive film24and the bottom member22A are adhered to each other, the adhesive film24and the part21B of the barrel member20A are adhered to each other, and parts of the adhesive film24protruding from the bottom member22A are adhered to each other. Accordingly, the side ends22dand22eof the bottom member22A are closed by the adhesive film24and are attached to a part on the sealant layer of the part21B of the barrel member20A through adhesion. The surface of the barrel member20A on the sealant layer side becomes the inner surface of the barrel portion20when the spout-equipped packaging bag1is realized. Since the base material layers are contacted to each other, the side ends22dand22eof the bottom member22A are not adhered to each other.

Similarly, the heat-seal portion HS2is formed by performing heat-sealing between the laminated body40and the barrel member20A in the part21C of the barrel member20A beyond the upper end of the bottom member22A such that all the side ends22fand22gof the bottom member22A are included from the bend line22ato the lower ends22hand22i. In the heat-seal portion HS2, the adhesive film24and the bottom member22A are adhered to each other, the adhesive film24and the part21C of the barrel member20A are adhered to each other, and parts of the adhesive film24protruding from the bottom member22A are adhered to each other. Accordingly, the side ends22fand22gof the bottom member22A are closed by the adhesive film24and are attached to a part on the sealant layer of the part21C of the barrel member20A through adhesion. The surface of the barrel member20A on the sealant layer side becomes the inner surface of the barrel portion20when the spout-equipped packaging bag1is realized. Since the base material layers are adhered to each other, the side ends22fand22gof the bottom member22A are not adhered to each other.

The side end20aside and the side end20bside of the barrel member20A are bent together with the bottom member22A and the side end side of the adhesive film24along the bend lines L1and L2positioned on the middle side from both the side ends22dand22eand the side ends22fand22gof the bottom member22A such that the surface to which the bottom member22A of the barrel member20A is attached becomes the inner surface. As such, they can be easily bent by causing one ends of the heat-seal portions HS1and HS2in the width direction to coincide with the bend lines L1and L2. Next, as illustrated inFIG.5A, the side end20aand the side end20bare caused to abut each other, the adhesive film26overlaps the inner surfaces thereof, and the heat-seal portion HS3is formed through heat-sealing, thereby forming the back joint25. Accordingly, the tubular barrel portion20is formed.

The bottom portion22is formed by performing heat-sealing between the lower ends22hand22iof the bottom member22A and the lower end20cside of the barrel portion20throughout the entire circumference of the barrel portion20to realize the heat-scale portion HS4. As illustrated inFIG.6A, in the stepped part in a region c in which the side end.22dand22eof the bottom member22A are positioned in the heat-seal portion HS4, 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 HS4, in addition to heat-sealing of the heat-seal portion HS4. Similarly, in the stepped part in a region in which the side ends22fand22gof the bottom member22A are positioned in the heat-seal portion HS4as 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 HS4.

For example, step (b) can be performed through the following steps (b1) to (b5).

(b1) The cut-out portion19is formed in the first part21aand the third part21cin the upper end part21of the barrel portion20of the bag body10obtained in step (a), that is, the front surface portion28and the rear surface portion30of the bag body10in a flat state, and the ruled lines48and49constituted of recessed bars for assisting folding of the upper end part21are formed on the front surface portion28and the rear surface portion30of the bag body10in a flat state.

(b2) The flange portion16of the spout12is inserted into the upper portion of the barrel portion20through the opening of the bag body10on the upper side, and the first part21aof the upper end part21of the barrel portion20is bent along the first side16aof the flange portion16and is heat-sealed to the upper surface16eof the flange portion16.

(b3) The third part21cof the upper end part21of the barrel portion20is bent along the third side16cof the flange portion16and is heat-sealed to the upper surface16eof the flange portion16.

(b4) The second part21band the fourth part21dof the upper end part21of the barrel portion20are bent along the second side16band the fourth side16dof the flange portion16respectively and are heat-sealed to the upper surface16eof the flange portion16.

(b5) Heat-sealing is performed again with respect to the upper end part21of the barrel portion20in its entirety in a state of being folded on the upper surface16eof the flange portion16.

As illustrated inFIGS.8and9, the semicircular cut-out portion19is formed such that the position of the nozzle portion14corresponds thereto when the spout12is attached to both the first part21aand the third part21cin the upper end part21of the barrel portion20of the bag body10obtained through step (a). The method for forming the cut-out portion19by partially cutting out the upper end part21of the barrel portion20is not particularly limited, and a known method can be utilized.

In addition, the ruled lines48and49constituted of recessed bars for assisting the upper end part21are formed in parts which are bent when the upper end part21is folded on the upper surface16eof the flange portion16of the spout12in the front surface portion28and the rear surface portion30of the bag body10in a flat state.

The ruled line48is formed in the upper portion of the front surface portion28and has the first ruled line48a, second ruled lines48band48b, third ruled lines48cand48c, fourth ruled lines48dand48d, and a fifth ruled line48e. The first ruled line48ais a line for assisting bending along the first side16aof the flange portion16and is formed to extend linearly in the width direction of the front surface portion28. The length of the first ruled line48ais equivalent to the length of the first side16aof the flange portion16, and the middle of the first ruled line48acoincides with the middle of the width direction of the front surface portion28. The second ruled lines48band48bare lines for assisting bending of the first part21aof the upper end part21in a trapezoidal shape and are formed linearly to the upper edge of the front surface portion28by being inclined from both ends of the first ruled line48atoward the middle side in the width direction. Third ruled lines48cand48care lines for assisting bending of the second part21band the fourth pan21dof the upper end part21in a trapezoidal shape and are formed linearly to the upper edge of the front surface portion28by being inclined from both ends of the first ruled line48atoward the side end side. The fourth ruled lines48dand48dare formed to the side edges23aand23bof the front surface portion28by being inclined downward from both ends of the first ruled line48a. The fifth ruled line48eis formed linearly in the width direction such that the lower ends of two fourth ruled lines48dand48dare connected to each other.

The ruled line49is formed in the upper portion of the rear surface portion30into a shape similar to that of the ruled line48and has a first ruled line49a, second ruled lines49band49b, third ruled lines49cand49c, fourth ruled lines49dand49d, and a fifth ruled line49e. The first ruled line49ais a line for assisting bending along the third side16cof the flange portion16and is formed to extend linearly in the width direction of the rear surface portion30. The length of the first ruled line49ais equivalent to the length of the third side16cof the flange portion16, and the middle of the first ruled line49acoincides with the middle of the rear surface portion30in the width direction.

The second ruled lines49band49bare lines for assisting bending of the third part21cof the upper end part21into a trapezoidal shape and are formed linearly to the upper edge of the rear surface portion30by being inclined from both ends of the first ruled line49atoward the middle side in the width direction. The third ruled lines49cand49care lines for assisting bending of the second part21band the fourth part21dof the upper end part21into a trapezoidal shape and are formed linearly to the upper edge of the rear surface portion30by being inclined from both ends of the first ruled line49atoward the side end side. The fourth ruled lines49dand49dare formed to the side edges23aand23bby being inclined downward from both ends of the first ruled line49a. The fifth ruled line49eis formed linearly in the width direction such that the lower ends of two fourth ruled lines49dand49dare 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 lines48and49is not particularly limited. Examples thereof include a method in which a cutter is pressed against a surface of the barrel member20A. The ruled lines48and49may be formed on the inner surface of the barrel portion20or may formed on the outer surface.

The flange portion16is inserted into an opening between the front surface portion28and the rear surface portion30of the barrel portion20from the upper portion of the bag body10while having the nozzle portion14of the spout12on the front surface portion28side and the first side16a(long side of the flange portion16) as the distal end. The flange portion16is inserted by performing positioning such that the position of the cut-out portion19matches the position of the nozzle portion14of the spout12, and the first side16amatches the first ruled line48a. Thereafter, the base overlaps the first side16a, and the heat-seal portion HS5ais formed by heat-sealing the first part21aof the barrel portion20to the upper surface16eof the flange portion16such that the shape in plan view becomes an isosceles trapezoid except for the cut-out portion19while having the second ruled lines48band48bas oblique sides.

After the heat-seal portion HS5ais formed, the upper portion of the barrel portion20is bent utilizing the fourth ruled lines48d.48d,49d, and49dand the fifth ruled line48esuch that triangular parts27aand27bare formed on the second side16bside and the fourth side16dside of the flange portion16of the spout12.

That is, the flange portion16is moved in a direction of the lower portion of the bag body10while holding up the flange portion16on the front surface portion28side. As illustrated inFIG.10A, a bend line51ais formed by folding the fifth ruled line48edownward and folding the first ruled line48aupward. In addition, the second ruled lines48band48bare also folded downward during this movement to form bend lines51band51b, the third ruled lines48cand48care also folded upward to form bend lines51cand51c, and the fourth ruled lines48dand48dare folded upward to form bend lines51dand51d. In this manner, when the flange portion16is moved in a direction of the lower portion of the bag body10while holding up the flange portion16on the front surface portion28side, all the first to fifth ruled lines of the front surface portion28are bent.

The barrel portion20of the spout-equipped packaging bag1illustrated inFIG.10Ais in a state of being folded into a flat shape. In the spout12, the flange portion16is in a state of being disposed to be parallel to the front surface portion28and the rear surface portion30of the barrel portion20. Hereinafter, the same applies toFIGS.10B,11, and12.

As indicated with an arrow inFIG.10A, the third part21cof the upper end part21of the barrel portion20is bent along the third side16cof the flange portion16utilizing the first ruled line49aof the rear surface portion30and is further bent utilizing the second ruled lines49band49bsuch that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS5cis formed by heat-sealing the third part21cto the upper surface16eof the flange portion16. A bend line53abent along the third side16cof the flange portion16in the third part21cof the upper end part21coincides with the first ruled line49a. In addition, inclined bend lines53band53bof the third part21cbent into a trapezoidal shape coincide with the second ruled lines49band49b.

The second part21bof the upper end pan21of the barrel portion20is bent along the second side16bof the flange portion16such that a portion of the second part21boverlaps the first part21aand the third part21cand is further bent utilizing the third ruled lines48cand49csuch that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS5bis formed by heat-sealing the second pan21bto the upper surface16eof the flange portion16. Similarly, the fourth part21dof the upper end part21of the barrel member20A is bent along the fourth side16dof the flange portion16such that a portion of the fourth part21doverlaps the first part21aand the third part21cand is further bent utilizing the fourth ruled lines48dand49dsuch that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS5dis formed by heat-sealing the fourth part21dto the upper surface16eof the flange portion16. The inclined bend lines51cand53cof the second part21bbent into a trapezoidal shape coincide with the third ruled lines48cand49c. The inclined bend lines51cand53cof the fourth part21dbent into a trapezoidal shape coincide with the third ruled lines48cand49c.

Regarding adhesion of the second part21bof the upper end part21of the barrel portion20to the upper surface16eof the flange portion16and adhesion of the fourth part21dof the upper end part21of the barrel portion20to the upper surface16eof the flange portion16, either may be performed first or they may be performed at the same time.

In steps (b2) to (b4), the upper end part21of the tubular barrel portion20is liquid-tightly adhered to the upper surface16eof the flange portion16in the spout12in a folded state, thereby obtaining the spout-equipped packaging bag1in which the spout12is attached to the upper portion of the bag body10.

Heat-sealing is performed again with respect to the upper end part21of the barrel portion20in its entirety in a state of being folded on the upper surface16eof the flange portion16. Accordingly, the upper end part21of the tubular barrel portion20is reliably liquid-tightly adhered to the upper surface16eof the flange portion16in the spout12in a folded state.

In the manufacturing method for a spout-equipped packaging bag of the present invention, as in the flange portion16of 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 bag1, 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 bag1.

For example, as long as the method is within a range in which the upper end part21of the tubular barrel portion20can be liquid-tightly adhered to the upper surface16eof the flange portion16in the spout12, 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 spout12is used, the upper end part21of the tubular barrel portion20may be folded and be liquid-tightly adhered to the upper surface16eof the flange portion16as follows. Specifically, similar to step (b2) described above, the heat-seal portion HS5ais formed as illustrated inFIG.11A. Next, it is folded in a direction of the arrow inFIG.11A. Then, as illustrated inFIG.118, the second part21bof the upper end part21of the barrel portion20is bent along the second side16bof the flange portion16such that a portion of the second part21boverlaps the first part21a. The second part21bis bent utilizing the third ruled lines48cand49csuch that the shape in plan view becomes a trapezoidal shape. The heat-seal portion HS5bis formed by heat-sealing the second part21bto the upper surface16cof the flange portion16. Next, it is folded in a direction of the arrow inFIG.11B. Then, as illustrated inFIG.11C, the third part21cof the upper end part21of the barrel portion20is bent along the third side16cof the flange portion16such that a portion of the third part21coverlaps the second part21butilizing the first ruled line49a. The third part21cis bent utilizing the second ruled lines49band49bsuch that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS5cis formed by heat-scaling the third part21cto the upper surface16eof the flange portion16. Next, it is folded in a direction of the arrow inFIG.11C. Then, the fourth part21dof the upper end part21of the barrel portion20is bent along the fourth side16dof the flange portion16such that a portion of the fourth part21doverlaps the third pan21c. The fourth part21dis bent utilizing the third ruled lines48cand49csuch that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS5dis formed by heat-sealing the fourth part21dto the upper surface16eof the flange portion16.

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 spout12is used, the upper end part21of the tubular barrel portion20may be folded and be liquid-tightly adhered to the upper surface16eof the flange portion16as follows. Specifically, similar to step (b2) described above, the heat-seal portion HS5ais formed as illustrated inFIG.12A. Next, it is folded in directions of two arrows inFIG.12A. Then, as illustrated inFIG.12B, the second part21bof the upper end part21of the barrel portion20is bent along the second side16bof the flange portion16such that a portion of the second part21boverlaps the first part21a. The second part21bis bent utilizing the third ruled lines48cand49csuch that the shape in plan view becomes a trapezoidal shape. The heat-seal portion HS5bis formed by heat-sealing the second part21bto the upper surface16eof the flange portion16. In addition, the fourth part21dof the upper end part21of the barrel portion20is bent along the fourth side16dof the flange portion16such that a portion of the fourth part21doverlaps the first part21a. The fourth part21dis bent utilizing the third ruled lines48cand49csuch that the shape in plan view becomes a trapezoidal shape, and the heat-seal portion HS5dis formed by heat-sealing the fourth part21dto the upper surface16eof the flange portion16. Next, it is folded in a direction of the arrow inFIG.12B. Then, the third part21cof the upper end part21of the barrel portion20is bent along the third side16cof the flange portion16such that a portion of the third part21coverlaps the second part21band the fourth part21dutilizing the first ruled line49a. The heat-seal portion HS5cis formed by heat-sealing the third part21cto the upper surface16eof the flange portion16such that the shape in plan view becomes a trapezoidal shape utilizing the second ruled lines49band49b.

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 part21ato the fourth part21dwith respect to axes extending in the width direction and the depth direction about the spout12, 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 bag1, the upper end part21of the tubular barrel portion20starts to be folded from the first part21a. However, the position in the upper end part21where 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 lines48and49illustrated inFIGS.8and9, 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 lines48and49are not limited. In the spout-equipped packaging bag of the present invention, for example, the upper end part21of the barrel portion20may be folded utilizing ruled lines48A and49A illustrated inFIGS.16and17as an example, and the upper end part21of the barrel portion20may follow the shape of the flange portion16in plan view to be in the same shape.

The ruled line48A is the same as the ruled line48except for having sixth ruled lines48fand seventh ruled lines48gin place of the second ruled lines48b, the third ruled lines48c, and the fourth ruled lines48ddescribed above.

The sixth ruled lines48fand48fextend linearly from the edges of the cut-out portion19on both sides to the side edges23aand23bof the front surface portion28through both ends of the first ruled line48aand correspond to the legs of the trapezoid in the trapezoidal heat-seal portion HS5ato which the first pan21ais heat-sealed. The seventh ruled lines48gand48gextend from both ends of the first ruled line48ato the upper edge of the front surface portion28while being parallel to the side edges23aand23b. In this case, the bend lines of the seventh ruled lines48gand48goverlap the bend line51a.

The ruled line49A is the same as the ruled line49except for having sixth ruled lines49fand seventh ruled line49gin place of the second ruled line49b, the third ruled line49c, and the fourth ruled line49ddescribed above.

The sixth ruled lines49fand49fextends linearly from the edges of the cut-out portion19on both sides to the side edges23aand23bof the rear surface portion30through both ends of the first ruled line49aand correspond to legs of the trapezoid in the trapezoidal heat-seal portion HS5cto which the third part21cis heat-sealed. The seventh ruled lines49gand49gextend from both ends of the first ruled line49ato the upper edge of the rear surface portion30while being parallel to the side edges23aand23b. In this case, the bend lines of the seventh ruled lines49gand49goverlap the bend line53a.

When the front surface portion28has the seventh ruled lines48gand48gand the rear surface portion30has the seventh ruled lines49gand49g, the shapes of the heat-seal portion HS5bto which the second part21bis heat-sealed and the heat-seal portion HS5dto which the fourth part21dis 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