JP2000190991A - Easy-to-open pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy-to-open pouch with excellent productivity which can be easily formed, into which the content is easily filled, with only a little fear of breakage and with superior safety. SOLUTION: An easy-to-open pouch 100 is formed into a bag with its four sides being sealed to each other, for example, a half-cut line 6 is arranged at a seal opening position of the pouch 100 to have a deeper depth at portions indicated by both side heat seals (a) and (a') and/or to have a wider width. At the portion of an intermediate section indicated by a non-seal section (b), their depth is shallower than that of the heat seal sections (a), (a') and/or has a narrow width and further both ends of the half-cut line 6 are provided with notches 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an easy-opening pouch, and more particularly, to a pouch provided with at least a half-cut line as an easy-opening means for facilitating opening of the pouch. The shape of the pouch can be improved, and when opening the pouch, it can be easily torn along the half-cut line and opened, and it is not easily cut off during normal handling such as manufacturing and distribution.
The present invention relates to an easy-open pouch excellent in safety.

[0002]

2. Description of the Related Art Conventionally, as an easily-openable pouch, there is known a pouch provided with notches of various shapes at an end of an opening position of the pouch. However, if a notch is provided, it will be the starting point of tearing when the pouch is opened, and it is effective in facilitating the start of tearing. It was difficult to tear.

[0003] To solve this problem, for example,
A method of laminating a uniaxially stretched film on an intermediate layer or the like of a pouch laminated film such that the stretching direction and the tearing direction (cutting direction) match in combination with the notch,
Alternatively, a method of providing a half-cut line at the position of the cut line is used.

However, the method of laminating a uniaxially stretched film has a problem that the material cost is increased, and when the cutting direction is an oblique direction of the pouch, it is difficult to make it coincide with the stretching direction of the film. In this regard, the method of providing a half-cut line can use laser beam irradiation and the like, and thus the initial cost of the apparatus is high, but the running cost is low and the degree of freedom in the processing direction is high, so this is an effective method.

[0005]

However, even when the half-cut line by the laser beam irradiation is provided at the opening position of the pouch, the opening position of the pouch is usually located at the middle part of the content filling area. There is a non-seal part of the part, and the heat seal part is provided at the position where it is connected to both ends, and the tearing direction can be stabilized along the half cut line, but in general, the tear strength at the heat seal part where tearing starts However, the tear strength becomes larger than the tear strength at the non-sealed portion in the middle portion, and a large force is required to start the tearing.

Therefore, for example, when the output of the laser beam irradiation is increased and the half-cut line is deeply processed, the tear strength at the heat-sealed portion is reduced and the tear can be easily performed. Since the tear strength at the seal portion is also reduced, the strength of this portion is weakened, the portion is easily broken by impact or the like, and the danger of bag breakage is increased, and there is a problem in terms of safety.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide at least a half-cut line as an easy-opening means at an opening position of a pouch. In the pouch, by improving the shape of the half-cut line, it is a pouch of a standing pouch type used for refill pouches as well as flat pouches such as a three-sided seal type and a four-sided seal type, and has a narrow upper part. Even if the pouch is easy to shift the opening direction such that a spout portion having a width is provided and a bulging portion for improving the opening property is further provided at the opening position of the spout portion, at the time of opening, half It can be easily opened by tearing along the cut line, and in normal handling such as during production and distribution, the contents may be cut and spilled out. That have, it is to provide better productivity and easy-open pouch also excellent in safety.

[0008]

The above objects can be attained by the present invention described below. That is, in the invention described in claim 1, in a pouch formed of a laminated film and the periphery thereof is heat-sealed in a bag shape, at least a half-cut line is provided as an easy-opening means at an opening position of the pouch. In addition, the half-cut line is provided in a shape having a deep part and a shallow part, and / or a wide part and a narrow part, and is formed of an easy-opening pouch.

In the above description, the shape of the pouch itself is not particularly limited, and it can be suitably applied to, for example, flat pouches such as three-side seal type, four-side seal type pouches and modified pouches, as well as standing pouches. When the half-cut line is provided as described above, a method using laser beam irradiation is particularly suitable because the productivity is good and the depth or width thereof can be easily adjusted.

[0010] By adopting such a configuration, the depth and width of the half-cut line provided at the opening position of the pouch can be changed as appropriate. The tear strength is small, and the wide part has a smaller tear strength than the narrow part, though not as noticeable as when the depth is changed. Therefore, for example, a half-cut line is formed by alternating a deep part and a shallow part, a wide part and a narrow part, or a deep part and a wide part and a shallow part and a narrow part and a narrow part. By forming it at an arbitrary length, the tear strength of the half-cut line, or the burst strength of this part, etc. can be adjusted appropriately, so that it has the necessary bag breaking strength and is excellent in safety, A pouch excellent in easy opening property can be easily obtained.

In the invention described in claim 2, the unsealing position is a position constituted by a heat-sealing portion on both sides and a non-sealing portion which is a content filling region in an intermediate portion. The said half cut line provided is provided so that it may become deeper and / or wider than the non-seal part of an intermediate part at least in the heat seal part of a tear start side. Item 1 comprises an easily-openable pouch according to Item 1.

Normally, as described above, the pouch is opened at a position where the heat seal portions are provided on both sides and the intermediate portion is constituted by a non-seal portion which is a part of the content filling region. . When a half-cut line is provided in such an opening position as an easy-opening means at a constant depth by a normal method, the tear strength in the heat-sealed portions on both sides is higher than the tear strength in the non-sealed portion in the middle portion. If the strength of the non-seal portion in the middle portion is adjusted appropriately, a large force is required to start the tearing.

Therefore, by adopting the above configuration, in addition to the operation and effect of the invention described in the first aspect,
Since the tear strength at least in the heat seal portion on the tear initiation side can be reduced, and the tear strength of the non-seal portion in the middle portion can be slightly increased, so that the burst strength and the like can be appropriately adjusted, so that the bag breaks. Thus, it is possible to more reliably obtain a pouch which is less dangerous and which is safe and has excellent openability.

According to a third aspect of the present invention, the pouch is a standing pouch having a spout having a narrow width, and a cutout is provided on at least one side of the spout. Further, a bulge is provided at a spout of at least one wall film of the pouch, and the half-cut line is provided so as to cross the bulge of the spout. Claim 1
Or an easy-open pouch described in 2.

Although the above half cut line may be one,
Assuming that the tearing direction is shifted, a plurality of lines, such as one line or two lines, may be provided in parallel on both sides of the center half-cut line. In addition, the pouch having the above-described configuration is particularly suitable as a pouch for packaging a liquid material for refilling or the like.

By adopting such a configuration, in addition to the function and effect of the invention described in claim 1 or 2, since the pouch is of a standing pouch type, it is self-supporting, easy to handle, and excellent in appearance. ing. And
The pouch is provided with a spout having a narrow width, a cutout is provided on at least one side thereof, and a bulge is provided on the spout of at least one wall film of the pouch, Since the half-cut line is provided so as to cross the bulging portion of the spout, even when the contents filled in the pouch are transferred to another container such as a bottle, the tip of the spout is half-cut. It can be easily torn open by hand along the cut line,
By opening, a swelling portion provided at the spout of the wall film of the pouch automatically opens the spout having good shape retention.

The contents can be poured out by applying the cutouts on the side of the opened spout to the mouth of the bottle, so that the spout is stable in the mouth of the bottle during pouring. The contents can be safely transferred to the end without blocking the spout on the way.

According to a fourth aspect of the present invention, the bulging portion is formed by a combination of surfaces, the cross-sectional shape in the width direction is a combination of straight lines, and the bulging portion is provided in a shape having steps of different heights. The easy-open pouch according to claim 3, wherein the pouch is provided.

By adopting such a configuration, in addition to the function and effect of the invention described in claim 3, a linear bent portion is formed at the boundary between the surfaces forming the bulging portion. Since this portion has a rib effect and the bulging portion has a shape having steps with different heights, the number of surfaces forming the bulging portion increases, and the number of the ribs also increases, so that the shape of the bulging portion is retained. In addition, the resistance to compression and the restoring force are increased, and the bulged portion is hardly crushed. Even if the bulged portion is once crushed, it is easy to recover when the force is removed, and the effect of the bulged portion can be more reliably obtained. it can.

According to a fifth aspect of the present invention, there is provided an easy-open pouch according to any one of the first to fourth aspects, wherein a notch is provided at an end of the half-cut line. .

By adopting such a configuration, in addition to the operation and effect of the invention described in any one of claims 1 to 4, the opening position is further clarified by the notch, and the operation at the start of opening can be performed. It becomes easy and, in combination with the effect of the half-cut line, can be accurately and easily torn and opened at a predetermined position.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments such as a film used for producing an easily-openable pouch of the present invention and a method for producing a pouch will be described below. The film used for producing the easy-opening pouch of the present invention is mainly a laminated film mainly composed of plastic, but is not particularly limited.For example, a known laminated film used for various liquid pouches is Any of these can be used, and among these, those suitable for use conditions such as the type of contents to be packaged and the presence or absence of heat treatment after filling can be freely selected and used. As a representative example of the configuration of the laminated film that can be preferably used, the following configuration can be given.

(1) ON film / adhesive / L·LDPE
Film (sealant layer) (2) ON film / adhesive / uniaxially stretched HDPE film / adhesive / L·LDPE film (sealant layer) (3) ON film / adhesive / uniaxially stretched PP film / adhesive / L·LDPE Film (sealant layer) (4) ON film / adhesive / uniaxially stretched PP film / adhesive / aluminum foil / adhesive / L / LDPE film (sealant layer) (5) ON film (silica vapor deposition layer) / adhesive / Uniaxially stretched HDPE film / adhesive / L-LDPE film (sealant layer) (6) ON film / anchor coat layer / co-extrusion coat layer (HDPE layer / L-LDPE layer) (sealant layer is L-LDPE layer) (7 ) ON film / anchor coat layer / coextrusion coat layer (HDPE layer / LDPE layer) / adhesive / L-LDP
E film (sealant layer) (8) PET film / adhesive / aluminum foil / adhesive / ON film / adhesive / L / LDPE film (sealant layer) (9) PET film / adhesive / aluminum foil / adhesive / ON film / adhesive / CPP film (sealant layer) (10) PET film / adhesive / ON film / adhesive /
Aluminum foil / adhesive / L / LDPE film (sealant layer) (11) PET film / adhesive / ON film / adhesive /
Aluminum foil / adhesive / CPP film (sealant layer) (12) PET film / adhesive / EVOH film / adhesive / ON film / adhesive / CPP film (sealant layer) Instead, various combinations of laminated films can be used.

In the above, the ON film is a biaxially stretched nylon film, the L / LDPE is a linear low density polyethylene, the HDPE is a high density polyethylene, the LDPE is a low density polyethylene, the PP film is a polypropylene film, and the PET film is biaxially stretched. A polyethylene terephthalate film and an EVOH film indicate a saponified ethylene-vinyl acetate copolymer film, and a CPP film indicates a non-stretched polypropylene film. The anchor coat is a kind of primer coat which is previously coated on the substrate film side in order to improve adhesiveness when laminating a resin by extrusion coating.

In the construction of the laminated film, ON
Films and PET films are used as base films to impart mechanical strength and printability to pouches,
The film and the uniaxially stretched PP film can be used in the same direction as the tearing direction when the pouch is opened, or when they are laminated so as to match as much as possible, whereby the tearing directionality can be further stabilized. In the easy-opening pouch of the present invention, since the half-cut line is provided at the opening position, the necessity of the uniaxially stretched film is slightly reduced.However, depending on the thickness and the configuration of the laminated film, the directionality of tearing is stabilized. This is useful in that Then, an aluminum foil, a silica vapor-deposited layer, an EVOH film, and the like are laminated to provide gas barrier properties.

As the sealant layer, two examples of the L·LDPE film and the CPP film have been described.
DPE films are excellent in heat seal stability and content resistance, such as stress cracking resistance to surfactants, and CPP films are excellent in heat resistance and low odor. Suitable for packaging of goods.

In the sealant layer, in addition to the above, depending on the content to be filled, ethylene / α-olefin copolymer, ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, ethylene / acrylic ester copolymer may be used. Polymers, ionomers, polyester resins and the like can also be appropriately selected and used.

In particular, an ethylene / α-olefin copolymer obtained by polymerization using a single-site catalyst such as a metallocene catalyst has a narrow molecular weight distribution and a stable copolymerization ratio, so that the low-temperature heat sealability and It is excellent in hot sealability, and is suitable for a sealant layer of a pouch having a step due to a difference in film overlap with a heat seal portion such as a standing pouch in that the occurrence of pinholes due to seal missing can be prevented. . Furthermore, by using a blend of the copolymer and an olefin elastomer, the heat fluidity of the sealant layer is improved, and the generation of pinholes due to the steps can be more effectively prevented.

Next, a method for producing an easily-openable pouch of the present invention produced using the above-described laminated film will be described. The easily-openable pouch of the present invention can be basically manufactured using a conventionally used bag making machine according to the shape of the pouch such as a three-side seal type, a four-side seal type, and a standing pouch type.

However, it differs from the ordinary pouch in that the following configuration is added. The point where the above-mentioned half cut line and the notch are provided at the opening position of the pouch as required. When a pouch is used for a refill pouch or the like, a narrow width spout portion is provided, and a cutout portion is provided on a side portion thereof, and at least a bulge portion as described above is provided in a film of the spout portion. .

Accordingly, a processing apparatus for providing the above additional components, that is, a laser beam irradiation apparatus for providing a half-cut line, a heat sealing apparatus for providing a spout, a notch, a notch, and the like. For example, an embossing device or the like is incorporated in a bag making machine, or a part thereof is prepared as a separate line, for adding or trimming a trimming device or the like, and providing a bulge portion on a wall film such as a spout portion. Thereby, it can be easily manufactured.

In particular, when providing a half-cut line, it is necessary to partially adjust the depth and width thereof. For example, in order to increase the depth, the laser beam is turned back and scanned at that portion. Irradiation may be performed a plurality of times on the same line. In order to increase the width, irradiation may be performed a plurality of times by shifting the position so that the lines are in contact with each other. Further, when it is desired to partially change both the depth and the width of the half-cut line, it can be implemented by performing the scanning operation of the laser light in combination.

The swelling height of the swelling portion provided at the spout of the wall film is not particularly limited, but is preferably about 1 to 7 mm, and about 2 to 5 mm at the spout. Is more preferred. 1m high
If it is less than m, the effect on the natural opening property is reduced,
In addition, a height exceeding 7 mm eliminates the necessity and makes the processing itself difficult, and at the same time, the spout portion becomes bulky, and the handleability of empty pouches, the suitability of loading empty pouches in a filling and sealing machine, and the like are reduced. Therefore, it is not preferable.
When the bulging portion is provided, for example, from the spout to the main body portion of the pouch, the bulging portion can be gradually inclined from the spout to lower the height to about 2 to 0.8 mm.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically with reference to the drawings. However, the present invention is not limited to these drawings. FIG. 1 is a plan view showing the configuration of one embodiment of the easy-open pouch of the present invention. In FIG. 1, an easily-openable pouch 100 is formed in a four-sided sealed form,
The bottom and both sides of one wall film 1 are heat-sealed with the bottom heat-sealing part 2 and the body heat-sealing parts 3 and 3 respectively, and the bag is formed into a bag with an open top, and the contents are sealed. A half-cut line 6 is provided at an opening position slightly below the upper heat seal portion 4 which is heat-sealed after filling, and V-shaped notches 5 are provided at both ends thereof.

The half-cut line 6 is provided by irradiating a laser beam, and heat seal portions on both sides thereof, that is,
In the portions indicated by a and a ', the depth is deep and / or the width is widened, and in the non-seal portion at the intermediate portion, that is, in the portion indicated by b, the heat seal portion (a, a' (Shown portion) is provided with a smaller depth and / or a smaller width. Such a half-cut line 6 is preferably provided symmetrically on the wall film on both sides.

By adopting such a configuration, the easily-openable pouch 100 can easily fill the contents from the upper opening and heat seal the pouch 100. Since the burst strength of the non-seal portion b in the middle of the half-cut line 6 is increased,
There is little danger of breakage and it is safe.
The portion of the upper heat seal portion 4 of the pouch 100 can be easily torn and opened at the position of the half cut line 6 with the notch 5 on either side as a starting point. The notches 5 are provided at both ends of the half-cut line 6 in the figure, but may be provided only on one side.

FIG. 2 is a front view showing the structure of another embodiment of the easy-open pouch of the present invention. FIG. 3 is similar to FIG.
5A is an enlarged cross-sectional view illustrating an example of a cross-sectional shape in the width direction of a bulging portion provided on a wall film of the easy-open pouch shown in FIG. (B) is an enlarged cross-sectional view near the cut line (half cut line) of the spout portion when () is provided.
FIG. 3 is an enlarged cross-sectional view near a cut line (half cut line) of a spout when bulging portions are symmetrically provided on wall films on both front and rear surfaces.

In FIG. 2, the easy-open pouch 200 is
The main part is made in a standing pouch format, and the bottom is formed in a gusset format in which the film is folded inward according to the usual method, and a semicircular shape is formed near the lower end on both sides of the film folded inward. Is formed by heat-sealing with a bottom heat-seal portion 2 of a boat bottom shape. The body of the pouch 200 is formed by heat-sealing both side edges of the front and rear two wall films with the body heat seal portion 3.

At the upper corner of the pouch 200, a narrow width spout 7 is formed by heat seals on both sides, and one side of the spout 7 (the left side in the figure). Part) is provided with a notch 8. Then, the bulging portion S is formed on the wall surface film of the pouch 200.
However, as shown in the figure, the shape is such that the shape is lowered obliquely downward from the spout 7 to the center in the width direction of the pouch 200 and vertically downward therefrom. The width and height of the spout 7 (S ₁ ) are reduced. The width and height gradually decrease toward the lower side diagonally, and the width and height are small and constant in the lower part (S ₃ ) from the middle part (S ₂ ), and the bulging part S is It is formed by a combination of surfaces in the height direction, and the cross-sectional shape in the width direction is
For example, as shown in FIGS. 3A and 3B, the shape is a combination of straight lines and is provided in a shape having steps with different heights. Such a bulging portion may be provided on only one of the two front and rear wall films, but is preferably provided symmetrically on the both wall films.

Further, in the vicinity of the distal end portion of the spout 7 of the wall film of the pouch 200, the half-cut line 6 is provided so as to cross the bulge portion S _1, the pouch 200
Is provided with a V-shaped notch 5 at the upper end. In addition, the upper heat seal part 4 of the upper part of the pouch 200,
Among the 4 ′, the upper heat seal part 4 ′ on the spout part side is
It is preferable to seal at the bag making stage, and it is preferable to fill the contents from the upper heat seal portion 4. Further, the half-cut line 6 has a deep depth at the heat-sealed portions on both sides, that is, portions indicated by a and a ', as in the case of the easy-opening pouch 100 shown in FIG. And / or the width is provided wider, and the depth of the non-seal portion in the middle portion, that is, the portion indicated by b, is smaller than the heat-sealed portion (the portion indicated by a, a ′), and / or The width is provided narrow. Such a half-cut line 6 is preferably provided symmetrically on the wall film on both sides.

By adopting the above configuration, the easy-opening pouch 200 filled with the liquid content and sealed by degassing and sealing the upper heat seal portion 4 is self-supporting.
It is easy to handle and excellent in appearance, and when transferring the contents to another container, the notch 5
By tearing in the direction of the half-cut line 6 using the same, the tear can be easily torn along the half-cut line 6 with the notch 5 as a starting point, and the spout 7 can be opened.

As described above, the half-cut line 6 is adjusted so that its depth and / or width are different between the heat-sealed portions a and a 'on both sides and the non-sealed portion b at the intermediate portion. Since the pouch 200 is provided, the pouch 200 has a low risk of bag breakage, is excellent in safety, and is also excellent in easy opening.

The opened pouch 200 is provided with the bulging portion S as described above from the spout 7 to the lower part of the pouch 200 on the wall surface film. Due to S ₁ , the opening is formed in a state of good shape retention, and the bulging portion S _{2 in} the middle portion connected to the bulging portion S ₁ , and further, the bulging portion S _{3 in the} lower portion are bent outward by the volume and weight of the contents. However, since the pouch 200 is spread outward, the contents flow smoothly to the spout and the pouring out of the spout. The lower bulging portion S ₃ is substantially constant in a vertical shape width and height, since it has a rib effect, shape stability of the pouch 200, the autonomy is increased. The bulging portion S is formed by a combination of surfaces in the height direction, and has a cross-sectional shape in the width direction,
Since it is provided in a shape having a step with different heights in a shape that is a combination of straight lines, it has a resistance to a compressive force and the like, is excellent in restorability, the opening property of the spout portion, the contents. It has an excellent effect on the suitability for pouring.

When the contents filled in the pouch 200 are transferred to another container such as a bottle, the pouch 2
Since the body of No. 00 is supported by hand and the cutout 8 provided on the side of the opened spout 7 can be transferred to the mouth of the bottle, for example, the contents can be transferred.
The spout is well fixed to the mouth of the bottle, so that even the contents having relatively high viscosity can be safely and easily transferred to the end without blocking the spout.

[0045]

As described in detail above, according to the present invention, the pouch can be manufactured with high productivity in substantially the same steps as ordinary pouches, and the contents can be easily filled. The half-cut line provided at the position can accurately and easily tear open the pouch, and also provide an easy-open pouch excellent in safety with little risk of pouch breakage. Play. Further, the pouch is formed in a standing pouch form, a narrow width spout portion is provided in a part of the upper portion thereof, a bulging portion is provided at least in the film of the spout portion, and further, the vicinity of the tip portion of the spout portion is provided. By providing a half-cut line on the film by adjusting its depth and / or width, the self-sustainability, form stability and appearance of the pouch are good, and at the time of use, the tip of a spout provided on the top of the pouch. The part can be easily and accurately cut off and opened, whereby the spout with excellent shape retention is automatically opened, so that not only low-viscosity contents but also high-viscosity contents are in the middle of pouring. An easy-opening pouch with excellent usability that allows the contents to be safely and easily transferred to the end without spilling out the contents even for small-diameter bottles without blocking the spout. Offer Achieve the kill effect.

[Brief description of the drawings]

FIG. 1 is a plan view showing a configuration of an embodiment of an easily-openable pouch of the present invention.

FIG. 2 is a front view showing the configuration of another embodiment of the easy-open pouch of the present invention.

FIG. 3 is an enlarged cross-sectional view illustrating an example of a cross-sectional shape in a width direction of a bulging portion provided on a wall film of the easy-open pouch shown in FIG. 2; (a) is one (front) wall film; It is an expanded sectional view in the vicinity of a cut line (half cut line) of a spout when only a bulge part (S) is provided, and (b) provides a symmetric bulge part in the wall film of both front and back. It is an expanded sectional view in the vicinity of the cut-off line (half cut line) of the spout portion in the case where it is set.

[Explanation of symbols]

1 wall film 2 bottom heat-sealed portion 3 barrel heat-sealed portions 4, 4 'upper heat-sealed portion 5 notch 6 half-cut line 7 spout 8 notch 100 and 200 easy-open pouch S bulge S ₁ spout bulges of bulging portions S ₂ middle portion parts S ₃ lower bulging portion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Otsuka 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Nana Sugimoto 1-1-1, Ichigaga-cho, Shinjuku-ku, Tokyo No. 1 Dai Nippon Printing Co., Ltd. F term (reference) 3E064 AA05 AB25 BB03 EA23 EA30 HN05 HP01 HP02 HS05 HU10

Claims (5)

[Claims] In a pouch formed of a laminated film and heat-sealed in a bag shape at the periphery, at least a half-cut line is provided at an opening position of the pouch as an easy-opening means, and the half-cut line is provided. Is provided in a shape having a deep portion and a shallow portion, and / or a wide portion and a narrow portion. 2. The unsealing position is a position comprising a heat-sealing portion on both sides and a non-sealing portion which is a content filling region in an intermediate portion, and the half-cut line provided at the unsealing position is At least in the heat sealing portion on the tearing start side, the depth is deeper than the non-sealing portion in the middle portion,
2. The easy-open pouch according to claim 1, wherein the pouch is provided so as to have a large width. 3. The pouch according to claim 1, wherein the pouch is a standing pouch having a spout having a narrow width, wherein a cutout is provided on at least one side of the spout, and at least one of the pouches is provided. The swelling portion is provided at the spout of the wall surface film, and the half-cut line is provided so as to cross the swelling portion of the spout. Openable pouch. 4. The bulging portion is formed by a combination of surfaces,
The cross-sectional shape in the width direction is a combination of straight lines, and
The easy-open pouch according to claim 3, wherein the pouch is provided in a shape having steps of different heights. 5. The easy-open pouch according to claim 1, wherein a notch is provided at an end of the half-cut line.