JP3336966B2 - Packaging bag with pouring function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to seasonings, cosmetics,
The present invention relates to a packaging bag with a discharging function provided with a nozzle portion for removing contents such as a detergent, and particularly to a packaging bag with a discharging function for removing contents having high viscosity.

[0002]

2. Description of the Related Art After being purchased, plastic bottles, glass bottles, or packaging bags used for seasonings, cosmetics, detergents, etc., which can be refilled, are easy to take out the contents and maintain a stable flow to the end. There is a need for something that can be taken out. As such a packaging bag, a packaging bag having a fold line at an opening (Japanese Patent Laid-Open No. 10-129,683) has been proposed.

[0003]

However, in the above-described packaging bag provided with a fold line in the opening, if a pressing force is applied to the packaging bag when taking out the contents after opening, the opening can be easily formed by the fold line. However, there is a problem that the opening state is not stable and the opening state after opening cannot be maintained. Further, when the pressing force on the packaging bag is weakened or stopped, the opening is narrowed or closed, which makes it difficult to pour out the contents.

Accordingly, it is an object of the present invention to open the nozzle portion of the packaging bag and open the nozzle portion to easily open the nozzle portion while stabilizing the opening state. It is an object of the present invention to provide a packaging bag that can stably and stably discharge contents to the end while maintaining a state, and is particularly suitable for discharging high-viscosity contents.

[0005]

[Means for Solving the Problems] In a packaging bag having a nozzle portion formed by heat-sealing a plastic film, a mountain fold line and a valley fold line extending from the root portion of the nozzle portion or the vicinity thereof to the inside of the packaging bag are formed by the nozzle from the inside of the packaging bag. A packaging bag with a pouring function, which is provided in the order of a mountain fold line and a valley fold line toward a part. 2. 2. The packaging bag with a pouring function according to 1, wherein a central mountain fold line is provided at the center of the nozzle portion so as to extend inward of the packaging bag beyond the nozzle portion. 3. 3. The packaging bag with a pouring function according to 2, wherein an auxiliary mountain fold line is provided at an acute angle from the upper end of the central mountain fold line toward the side end of the nozzle portion. 4. 4. The packaging bag with a pouring function according to 2 or 3, wherein an auxiliary valley fold line is provided on an extension of the central mountain fold line in a region between the mountain fold line and the valley fold line. 5. In a region between the mountain fold line and the valley fold line, a second portion from the side end of the mountain fold line or the vicinity thereof to the inside of the packaging bag.
Any one of 2 to 4, characterized in that a mountain fold line is provided.
A packaging bag with a pouring function according to the item. 6. 6. The packaging bag with a pouring function according to 5, wherein the valley fold line is formed in a substantially S shape, and the second mountain fold line is provided in a substantially S shape substantially parallel to the valley fold line. 7. 7. The packaging bag with a pouring function according to any one of claims 1 to 6, wherein the mountain fold line and the valley fold line are provided so as to be in contact with each other at or near the root of the nozzle portion. 8. 8. The packaging bag with a pouring function according to any one of 2 to 7, wherein the central mountain fold line is constituted by three lines, and the lower ends of the central mountain fold lines on both sides are curved outward. .

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The material of the plastic film used for the packaging bag of the present invention is not particularly limited. Examples of a plastic material suitable for forming a plastic film include, for example, crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low-, medium-, Alternatively, high-density polyethylene, ethylene-vinyl acetate copolymer (E
VA), ethylene-ethyl acrylate copolymer (EE
A), ion-crosslinked olefin copolymer (ionomer)
Polyolefins such as polystyrene and styrene-butadiene copolymer; aromatic vinyl copolymers such as polyvinyl chloride and vinylidene chloride resin; acrylonitrile-styrene copolymer and acrylonitrile-styrene-butadiene copolymer Nitrile polymers such as polymers; polyamides such as nylon 6, nylon 66, para- or meta-xylylene adipamide; polyesters such as polyethylene terephthalate and polytetramethylene terephthalate; various polycarbonates; polyacetals such as polyoxymethylene Thermoplastic resin. A plastic film made of these materials is used after being unstretched, uniaxially stretched, or biaxially stretched.

[0007] The plastic film used in the packaging bag of the present invention can be composed of a single layer of these plastic films or a laminate of two or more types.
One or two or more of these plastic films can be bonded to a metal foil such as aluminum, paper, cellophane, or the like. As a preferred plastic film, for example, a stretched nylon film as an outer layer, a low-density polyethylene, a two-layer structure having a polyolefin film such as polypropylene as an inner layer, a stretched polyester film as an outer layer, a two-layer structure having a polyolefin film as an inner layer, and Among these, a three-layer film or the like in which a metal foil such as aluminum is laminated between outer layer films, and the like. In the production of these laminated films, an adhesive or an anchoring agent is interposed between layers as necessary. You can also.

[0008] The layer structure of the plastic film is selected according to the properties of the contents to be filled in the packaging bag. For example, when low cost is required as in the case of a packaging bag for a refillable detergent, two layers are required. When a laminated film having a layer configuration is used and storage stability is required as in a packaging bag for seasonings, a laminated film having a three-layer configuration or more including an aluminum foil may be used.

Further, in the packaging bag of the present invention, a nozzle portion is provided above the packaging bag, and this nozzle portion is preferably provided at a corner above the packaging bag as shown in FIG. It may be provided in the upper central part.
The shape and dimensions of the nozzle portion may be appropriately set according to the properties of the contents to be poured and the dimensions of the packaging bag.

[0010] The packaging bag of the present invention has a mountain fold line (a fold line convex toward the outside of the packaging bag) and a valley fold line (of the packaging bag) extending from or near the base of the nozzle portion toward the inside of the packaging bag. A fold line convex toward the inside) is provided in the order of a mountain fold line and a valley fold line from the inside of the packaging bag toward the nozzle portion, and the mountain fold line and the valley fold line are at least one side of the nozzle portion, preferably Are provided on both sides. By providing the mountain fold line and the valley fold line, when the packaging bag is opened, the outward bias of the mountain fold line and the inward bias of the valley fold line work, so that the center of the nozzle portion is outward. The nozzle protrudes, the width of the nozzle is reduced by approaching both sides of the nozzle, and the center of the nozzle is expanded. The nozzle is opened only by this opening operation, and the opened state is maintained after the opening.

That is, by providing the mountain fold line and the valley fold line, when the packaging bag is opened and the contents are poured out,
Depending on the pressing force on the packaging bag and the weight of the contents in the packaging bag,
Outward deformation and distortion occur near the base of the nozzle of the packaging bag. And deformation near the base of the nozzle of the packaging bag,
The acting force due to the distortion sequentially acts on the mountain fold line and the valley fold line, and the mountain fold line protrudes to the outside of the packaging bag in a state where the width is narrow, while the valley fold line is inward in a state where the width is narrow. Protruding into
Since the acting force concentrates on the nozzle part, the nozzle part is inverted and protrudes outward, it is easily pushed outward and opened, and the open state is maintained without closing, and stable pouring is performed. State can be maintained. (See Fig. 4)

As described above, when the packaging bag is opened, the center of the nozzle portion is pushed out and the width of both sides is reduced. Therefore, the width of both sides of the nozzle portion is made larger than the inner diameter of the mouth of the refill container in advance. The opening area can be increased. still,
The shape of the mountain fold line and the valley fold line in the present invention is not particularly limited, and for example, a shape such as a V-shape, a U-shape, or a parabolic shape can be adopted.

In the packaging bag of the present invention, a center fold line is provided at the center of the nozzle portion, inward of the packaging bag beyond the nozzle portion, so that a mountain fold line and a valley fold line can be provided at the time of opening. And the packaging material adjacent to the central mountain fold line is inverted and protrudes outward (see FIG. 2), so that the nozzle portion can be more easily and reliably expanded and spread.
The bending of the nozzle portion is also prevented.

Further, in the packaging bag of the present invention, an auxiliary mountain fold line is formed at an acute angle from the upper end (opening side end) of the central mountain fold line toward the side end of the nozzle portion. Pushing and spreading of the portion can be further facilitated.

Further, in the packaging bag of the present invention, in a region defined by the mountain fold line and the valley fold line, an auxiliary valley fold line is provided on the extension line of the central mountain fold line, so that the pressing force on the packaging bag can be reduced. The acting force due to the own weight of the contents in the packaging bag is efficiently transmitted from the mountain fold line to the valley fold line, the valley fold of the valley fold line is reliably performed, and the nozzle portion can be more easily pushed and spread. it can. This auxiliary valley fold line is usually formed so as to be continuous with the central ridge fold line on an extension of the central ridge fold line, but may be formed discontinuously with the central fold line. Further, the auxiliary valley fold line may be configured to be in contact with the adjacent mountain fold line and the valley fold line, or may be configured not to be in contact. In order to sharpen the pushing and spreading of the nozzle portion, it is preferable to form the auxiliary valley fold line so as to be continuous with the central mountain fold line and to be in contact with the valley fold line but not to be in contact with the mountain fold line inside the packaging bag. .

In the packaging bag of the present invention, a second mountain fold line is provided in a region defined by the mountain fold line and the valley fold line from the side end of the mountain fold line or the vicinity thereof to the inside of the pouch. Can be. By providing the second mountain fold line, the angle of the inclined surface formed between the mountain fold line and the valley fold line at the time of opening of the nozzle portion is increased (to a steep slope), and the valley formed by the valley fold line is formed. The formation can be made deep, and the nozzle portion can be surely spread. In addition, by forming the mountain fold line in this way, the strength of the nozzle portion is improved, and the mountain fold line and the valley fold line are formed by external force when transporting or storing the contents after filling the packaging bag. Deformation to the opposite shape can be prevented.

The shape of the valley fold line provided in the packaging bag of the present invention is preferably formed in a gentle S-shape as shown in FIG. Further, it is preferable that the second mountain fold line is also formed in an S-shape similarly to the valley fold line. In this manner, by forming the valley fold line and the second mountain fold line in a gentle S-shape, the nozzle portion swells without difficulty, so that it is easy to push and expand, and the length of the valley fold line becomes longer, so that the nozzle portion becomes longer. Increases in cross-sectional area, and the time required to pour out the contents can be reduced.

In the packaging bag of the present invention, as shown in FIGS. 7 to 9, it is preferable that the mountain fold line and the valley fold line are formed so as to be in contact with each other at or near the base of the nozzle portion. By concentrating the mountain fold line and the valley fold line at one location at the root of the nozzle in this way, the contact point between the mountain fold line and the valley fold line acts as an inflection point in the formation of the nozzle when the nozzle is opened. Further, it is possible to further easily push and expand the nozzle portion. Further, it is more preferable that the second mountain fold line be similarly concentrated at substantially the same location.

In the packaging bag of the present invention, as shown in FIG. 9, the central mountain fold line is constituted by three lines, and the lower ends of the central mountain fold lines on both sides can be bent outward. It is particularly preferable that the lower end portion of the central mountain fold line is formed so as to be substantially perpendicular to the valley fold line as shown in FIG. By adopting such a configuration, the cross-sectional area of the nozzle portion is increased, and at the time of opening, the mountain fold deformation due to the central mountain fold line on both sides reaches the valley fold line at an acute angle, and the valley folds over the valley fold line. Impairing the fold deformation can be prevented. The packaging bags of the present invention are not bulky when stacked and transported or stored, can prevent collapse of a load, and do not require an extra space.

In order to provide the mountain fold line, the valley fold line, the central mountain fold line, the auxiliary mountain fold line, the auxiliary valley fold line and the second mountain fold line of the above-mentioned packaging bag of the present invention, all It is preferable that the plastic film to be formed is formed by embossing a jig heated by heating or high-frequency heating, but it is also possible to form the jig having a desired shape by heating the plastic film before forming the bag. good. And these fold lines
It may be constituted by a continuous line, or may be constituted as a discontinuous line. However, in order to easily and surely push and expand the nozzle portion of the packaging bag, it is preferable to constitute a continuous line.

Further, in the nozzle portion of the packaging bag of the present invention,
An easy-open processing portion can be provided to facilitate opening of the packaging bag. Examples of such an easy-opening processing portion include an I-type and a V-type notch formed in the nozzle portion, perforations and scores crossing the nozzle portion, and other thinning processing portions. Examples include laser processing, machining with a blade, a grindstone, and the like, and electric discharge machining such as corona discharge and plasma discharge. The shape of the packaging bag of the present invention is not particularly limited, and examples thereof include a three-sided or four-sided sealed flat bag, a standing pouch, and the like.

Next, the packaging bag of the present invention will be described with reference to the drawings.
Although described in more detail, these specific examples do not limit the content of the present application. FIG. 1 shows a first example of the packaging bag of the present invention.
FIG. 2 is a front view showing the embodiment, FIG. 2 is a schematic cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a view showing a situation when the packaging bag of FIG. 1 is poured out, and FIG. 4 is BB in FIG. It is a cross section schematic diagram in a line.
The packaging bag (1) has a filling port (2) at an upper part thereof, a nozzle part (3) at an upper corner part, and a nozzle part (3).
An easy-opening processing part (4) is provided at the tip of. Then, a V-shaped mountain fold line (5) extending from the base of the nozzle portion (3) to the inside of the packaging bag (1) and a c-shaped portion extending from the vicinity of the base to the inside of the packaging bag (1). The letter-shaped valley fold line (6) is sequentially provided from inside the packaging bag (1) toward the nozzle portion (3).

At the center of the nozzle portion (3), a central mountain fold line (7) composed of three straight lines consisting of a long straight line at the center and a short straight line at both ends is provided at the center of the nozzle portion (3). Over 3), toward the inside of the packaging bag (1),
It is provided toward the C-shaped valley fold line (6). Further, the nozzle portion (3) is formed with a straight auxiliary mountain fold line (8) at an acute angle from the upper end of the central mountain fold line (7) toward both side ends of the nozzle portion (3). Each is provided. In this packaging bag (1), the central mountain fold line (7) composed of three straight lines is provided in the nozzle portion (3), so that the central portion of the nozzle portion (3) can be more easily pushed and spread. Since the nozzle portion (3) is prevented from being bent while being reliably performed, it is possible to stably and quickly pour even the contents having high viscosity. In addition, since the nozzle portion (3) is provided with linear auxiliary mountain fold lines (8) which form an acute angle from the upper end of the central mountain fold line (7) and are directed to both end portions, the nozzle portion (3) 3) It becomes possible to further easily push and expand the vicinity of the pouring tip. That is, by providing the above-mentioned three central mountain fold lines (7) and auxiliary mountain fold lines (8) in the nozzle portion (3), the opened nozzle portion (3) and the vicinity of the tip thereof are illustrated in FIG. As shown by the arrow in FIG. 2, the width can be easily reduced, and the opening can be greatly expanded.

In order to pour out the contents using the packaging bag (1), the easy-opening section (4) provided at the tip of the nozzle section (3) is opened, as shown in FIG. Then, the contents are poured out by inserting the nozzle part (3) into another refill container (10) such as a plastic bottle with the packaging bag (1) turned upside down. At this time, the vicinity of the base of the nozzle portion (3) is deformed or distorted outward due to the pressing force on the packaging bag (1) and the weight of the content, and first, the base of the nozzle portion (3) is obtained. The V-shaped mountain fold line (5) provided from the portion toward the inside of the packaging bag (1) is deformed so as to protrude outward in a state where the width is narrow. On the other hand, the nozzle part (3)
The C-shaped valley fold line (6) provided from the vicinity of the base portion toward the inside of the packaging bag (1) is deformed so as to protrude inward in a state where the width becomes narrow. Then, as shown in FIG. 4, due to the acting force due to the deformation of the mountain fold line (5) and the valley fold line (6), the nozzle portion (3) easily moves outward with the valley fold line (6) as a base line. It is pushed out and opened.

As the pouring of the contents from the packaging bag (1) to another refill container (10) proceeds, the contents of the packaging bag (1) decrease, and the pressing force on the packaging bag, The acting force of the deformation and distortion due to the weight of the contents in the package is reduced. But,
The nozzle portion (3) of the packaging bag (1) is in contact with the mouth of the refill container (10), and the valley fold line (6) protrudes inward with the width reduced, and the central mountain fold line. Since (7) keeps a state of protruding outward, the opening state of the nozzle portion (3) is maintained and does not close.

FIG. 5 is a view showing a second embodiment of the packaging bag according to the present invention, in which the nozzle portion (3) is opened, and the basic configuration of the packaging bag (1) is shown in FIGS. The first shown in FIG.
It is the same as the packaging bag of the embodiment, and for the same configuration,
The same reference numerals are given. In this example, a valley fold line (6) is provided in a V shape from the vicinity of the base of the nozzle portion (3) toward the inside of the packaging bag (1), that is, downward. Also, all the central mountain fold lines (7) formed of three straight lines provided in the nozzle portion (3) are provided so as to be in contact with the V-shaped valley fold line (6). Therefore, as in the case of the first embodiment shown in FIGS. 1 to 4, this packaging bag can stably and quickly pour out even contents having high viscosity.

FIG. 6 is a partially enlarged view showing a third embodiment of the packaging bag of the present invention, and shows a state where the nozzle portion (3) is opened. The basic configuration of this packaging bag (1) is the same as the packaging bag of the first embodiment shown in FIGS. 1 to 4 and the packaging bag of the second embodiment shown in FIG. Have the same reference numerals. In the packaging bag (1), a mountain fold line (5) and a valley fold line (6) are provided from the base of the nozzle portion (3) toward the inside of the packaging bag (1), that is, downward. ing. Further, the mountain fold line (5) and the valley fold line (6) are not similar to each other, but are each composed of three straight lines, and the upper end thereof is provided discontinuously with the root of the nozzle portion (3). . Further, a second auxiliary mountain fold line (9) is provided from both ends of the bottom of the valley fold line (6) to the center line of the central mountain fold line (7). Therefore, this packaging bag is also stable and quick even with high-viscosity contents, like the packaging bag of the first embodiment shown in FIGS. 1 to 4 and the packaging bag of the second embodiment shown in FIG. Can be poured out.

FIG. 7 is a partially enlarged view showing a fourth embodiment of the packaging bag of the present invention, and shows a state where the nozzle portion (3) is opened. The basic configuration of the packaging bag (1) is the same as the packaging bag of each of the above embodiments, and the same components are denoted by the same reference numerals. In this example, the root portion (1) of the nozzle portion (3)
A V-shaped valley fold line (6) and a U-shaped mountain fold line (5) are provided from 4) toward the inside of the packaging bag (1), that is, downward. The valley fold line (6) and the mountain fold line (5) are provided so as to be in contact with each other at the base portion (14) of the nozzle portion (3). Further, all of the central mountain fold lines (7) formed of three straight lines provided in the nozzle portion (3) are formed so as to be in contact with the V-shaped valley fold line (6). In a region defined by the V-shaped valley fold line (6) and the U-shaped ridge fold line (5), an auxiliary valley fold line ( 16) is provided so as not to contact the U-shaped mountain fold line (5). Further, from both side ends of the mountain fold line (5), inward second mountain fold lines (15) are formed. In this packaging bag, when the contents are poured out by opening the nozzle portion (3), the internal pressure in the bag increases due to the pressing force and the weight of the contents, and the mountain fold line (5)
The neighborhood rises from the inside of the bag, and the second from the mountain fold line (5)
The area extending to the mountain fold line (15) is the second mountain fold line (1).
5), the region from the second mountain fold line (15) to the valley fold line (6) is depressed in the opposite direction, and the second mountain fold line ( 15) The area is reversed and protrudes outward. At this time,
The auxiliary valley fold line (16) rises from the mountain fold line (5) to the second mountain fold line (15), and rises to the second mountain fold line (1).
5) Since the valley fold line (6) is inclined deeply from the vicinity to the valley fold line (6), and the valley fold line (6) also forms a deep valley, the valley fold is maintained even when the contents are poured out and the internal pressure decreases. Further, in the vicinity of the protruding second mountain fold line (15), even if the contents are poured and the internal pressure is reduced, the protruding portion is kept outward, so that the opening state of the nozzle portion (3) is not changed. It is kept. Therefore,
As with the packaging bags of the above embodiments, this packaging bag can stably and quickly pour out even contents having high viscosity.

FIG. 8 is a partially enlarged view showing a fifth embodiment of the packaging bag of the present invention, and shows a state where the nozzle portion (3) is opened. The basic configuration of the packaging bag (1) is the same as the packaging bag of each of the above embodiments, and the same components are denoted by the same reference numerals. In this example, the two central fold lines (7) formed of three straight lines are made short so as not to be in contact with the V-shaped valley fold line (6), and the second mountain fold line (15) is formed. The same structure as that of the fourth embodiment of FIG. 7 except that the U-shaped mountain fold line (5) is formed inward from the vicinity of the side end of the mountain fold line (5) so as not to touch the U-shaped mountain fold line (5). Having. Therefore, as in the case of the packaging bags of the above embodiments, this packaging bag can stably and quickly pour out even high-viscosity contents.

FIG. 9 is a partially enlarged view showing a sixth embodiment of the packaging bag of the present invention, in which the nozzle portion (3) is in an unopened state. The basic configuration of the packaging bag (1) is the same as the packaging bag of each of the above embodiments, and the same components are denoted by the same reference numerals. In this example, the root portion (1) of the nozzle portion (3)
From 4) toward the inside of the packaging bag (1), ie, downward, a gentle S-shaped valley fold line (6) and a mountain fold line (5) consisting of a curved continuous curve are formed. It is provided. Further, the second mountain fold line (15) is formed in a gentle S-shape substantially parallel to the valley fold line (6). Then, two lower end portions (1) on both sides of the central mountain fold line (7) composed of three straight lines.
8) is bent outward so as to be substantially perpendicular to the valley fold line (6). An auxiliary valley fold line (16) is provided so as not to be in contact with the mountain fold line (5) on an extension of the middle central mountain fold line (7), and a sewing machine is provided at the tip of the nozzle portion (3). An eye-opening section (4) is provided.
In this packaging bag, the nozzle portion can be pushed and spread very easily at the time of opening, and the high-viscosity contents can be stably and quickly poured out similarly to the packaging bags of the above embodiments.

[0038]

According to the packaging bag of the present invention, when opening the nozzle portion of the packaging bag to pour out the contents, the action of deformation or distortion generated near the base of the nozzle portion is utilized. The nozzle part is pushed out to form a large opening, and even for high-viscosity contents, it is easy to pour out the nozzle part while preventing it from bending, ensuring a stable flow to the end. It is possible to quickly and quickly pour out the contents. In addition, as the contents are discharged from the packaging bag to another refill container, the contents of the packaging bag decrease, the pressing force on the packaging bag, the deformation and distortion of the content in the package due to its own weight. In this case, the opening state of the nozzle portion of the packaging bag is maintained, and the nozzle is not closed. Furthermore, when the product is stacked and transported or transported, it does not become bulky and does not require collapse of the load or extra space.

[Brief description of the drawings]

FIG. 1 is a front view of a packaging bag according to a first embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view taken along line AA of FIG.

FIG. 3 is a diagram showing a situation when the packaging bag of FIG. 1 is poured out.

FIG. 4 is a schematic sectional view taken along line BB in FIG. 3;

FIG. 5 is a front view of a packaging bag according to a second embodiment of the present invention.

FIG. 6 is a partially enlarged view of a packaging bag according to a third embodiment of the present invention.

FIG. 7 is a partially enlarged view of a packaging bag according to a fourth embodiment of the present invention.

FIG. 8 is a partially enlarged view of a packaging bag according to a fifth embodiment of the present invention.

FIG. 9 is a partially enlarged view of a packaging bag according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Filling opening 3 Nozzle part 4 Easy-open processing part 5 Mountain fold line 6 Valley fold line 7 Central mountain fold line 8 Auxiliary mountain fold line 9 Second auxiliary mountain fold line 10 Refill container 15 2nd mountain fold line 16 Auxiliary fold line

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 33/36-33/38 B65D 75/58-75/70 B65D 77/30-77/40

Claims (8)

(57) [Claims] 1. A packaging bag having a nozzle formed by heat-sealing a plastic film, wherein a mountain fold line and a valley fold line extending from a root portion of the nozzle portion or the vicinity thereof to the inside of the packaging bag are formed. A packaging bag with a pouring function, provided in the order of a mountain fold line and a valley fold line from the inside toward the nozzle portion. 2. The packaging bag with a pouring function according to claim 1, wherein a central mountain fold line is provided at the center of the nozzle portion so as to extend inward of the packaging bag beyond the nozzle portion. 3. The packaging bag with a pouring function according to claim 2, wherein an auxiliary mountain fold line is provided at an acute angle from the upper end of the central mountain fold line toward the side end of the nozzle portion. 4. A pouring function according to claim 2, wherein an auxiliary valley fold line is provided on an extension of the central mountain fold line in a region between the mountain fold line and the valley fold line. Packaging bag. 5. A fold line extending from the side end of the fold line or its vicinity to the inside of the packaging bag in a region between the fold line and the valley fold line. The packaging bag with a pouring function according to any one of claims 2 to 4. 6. The note according to claim 5, wherein the valley fold line is formed in a substantially S shape, and the second mountain fold line is provided in a substantially S shape substantially parallel to the valley fold line. Outer packaging bag. 7. The packaging with a pouring function according to claim 1, wherein the mountain fold line and the valley fold line are provided so as to be in contact with each other at or near the base of the nozzle portion. bag. 8. The central mountain fold line is composed of three lines,
The packaging bag with a pouring function according to any one of claims 2 to 7, wherein the lower ends of the central mountain fold lines on both sides are curved outward.