JP2024016624A - standing pouch - Google Patents

Abstract

An object of the present invention is to provide a standing pouch capable of discharging steam generated from contents by heating from an intended position of a side seal portion and/or an upper seal portion of the pouch. SOLUTION: The standing pouch of the present invention is a standing pouch in which a front sheet 11, a back sheet, and a bottom sheet are heat-sealed to form a storage section 14 for accommodating contents, and the front sheet 11 and the back sheet are at least made of a composite film 10, and the half cut H of the composite film 10 is arranged so as to reach from the accommodating part side to the outer peripheral part side of the standing pouch 100, At least a portion of the side seal portion 13 constitutes a wide side seal portion 13a that is wider than other portions of the side seal portion 13 in a portion where the half cut H is not present. , a standing pouch. [Selection diagram] Figure 1

Description

The present invention relates to a standing pouch. More specifically, the present invention relates to a standing pouch in which steam, particularly water vapor, generated from the contents by heating can be discharged from intended positions of the side seal portion and/or the top seal portion of the pouch.

Conventionally, microwave pouches have been known that allow steam to be released from an intended position.

For example, Patent Document 1 proposes a standing pouch equipped with an automatic steam release mechanism that can exhaust steam generated from the contents to the outside during cooking using a microwave oven. In Patent Document 1, at least one side end of the body of a standing pouch is provided with an overhanging seal portion that bends and overhangs toward the inside of the pouch, and when the overhang seal portion breaks, steam is released. It becomes possible to remove it.

Patent Document 2 proposes a laminate in which a base material layer, a heat-softening layer, and a sealant layer are laminated in this order as a packaging material for a pouch. Then, half-cuts are made from the sealant layer side of the laminate, and when cooking in a microwave oven, the steam is passed through the half-cuts at the heat-sealed part where the sealant layers are heat-sealed to each other, allowing the steam to escape from the pouch. It is said that it will be removed.

JP2020-200048A Japanese Patent Application Publication No. 2017-124859

However, in the standing pouch described in Patent Document 1, in order to make the automatic steam release mechanism function, the sealing strength of the overhanging seal portion is made weaker than the sealing strength of the side end portion, and the seal width of the overhanging seal portion is made weaker than the sealing strength of the side end portion. It was necessary to form it thinly. For this reason, not only the manufacturing process of the standing pouch becomes complicated, but also a problem may arise in the strength of the obtained standing pouch.

Moreover, the packaging material described in Patent Document 2 requires an adhesive layer in addition to the thermosoftening resin layer between the base material layer and the sealant layer. The thermoplastic resin layer is scattered and embedded in the adhesive layer, and is disposed only in the half-cut region. For this reason, the packaging material described in Patent Document 2 has the problem that not only the manufacturing process of the laminate becomes complicated, but also the cost increases.

Furthermore, when a standing pouch is made from the packaging material described in Patent Document 2, it is difficult to vent steam from the intended position due to the shape of the space for storing the contents of the standing pouch. It may be a situation.

Specifically, since a standing pouch is generally formed by folding and sealing the lower part of the pouch, the space at the lower part of the pouch is wide and the space at the upper part of the pouch is narrow. The peeling force due to the pressure of steam generated by heating, for example, water vapor, is most strongly applied to the upper seal portion of the pouch, which is a narrower space. For this reason, even if a steam venting mechanism is provided in the body of the pouch, it is difficult to make the steam venting mechanism function due to the existence of the peeling force difference, and in some cases, the upper seal portion of the pouch may rupture. The bag may break.

The present invention has been made in view of the above background, and provides a standing pouch that allows steam generated from the contents by heating to be discharged from the intended position of the side seal portion and/or top seal portion of the pouch. The purpose is to provide pouches.

After intensive study, the present inventors found that the above-mentioned problem could be solved by the following means, and completed the present invention. That is, the present invention is as follows:
<Aspect 1> A standing pouch in which a front sheet, a back sheet, and a bottom sheet are heat-sealed at least at the top seal part and the side seal part to form a storage part that stores contents,
At least one of the front sheet and the back sheet is made of a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order, and the front sheet and the back sheet facing each other are made of a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order. the sheet is heat-sealed to form the upper seal portion and the side seal portion;
The composite film includes a half cut made from the side of the inner layer and reaching the adhesive layer,
The half cut is arranged so as to cross the side seal part from the accommodating part side of the standing pouch to the outer peripheral part side of the standing pouch,
A part of the side seal part constitutes a wide side seal part that is wider than other parts of the side seal part in a part where the half cut does not exist.
standing pouch.
<Aspect 2> The standing pouch according to aspect 1, wherein the wide side seal portions are present on both side seal portions.
<Aspect 3> The standing pouch according to aspect 1 or 2, wherein the wide side seal portion is in contact with the bottom sheet.
<Aspect 4> The side seal portion and/or the top seal portion are at least one type selected from the group consisting of an unsealed portion where the front sheet and the back sheet are not heat-sealed, a notch, and a notch. has
The unsealed portion, the notch, and/or the notch protrude toward the accommodating portion of the standing pouch from a side edge and/or an upper edge of the standing pouch,
The half cut is arranged so as to cross the unsealed part, the notch, and/or the notch from the accommodating part side of the standing pouch to reach the outer peripheral side of the standing pouch.
The standing pouch according to any one of aspects 1 to 3.
<Aspect 5> The side seal portion and/or the top seal portion include a convex seal portion protruding toward the accommodating portion side of the standing pouch,
The half cut is arranged from the accommodating part side of the standing pouch to cross the convex seal part and reach the outer peripheral part side of the standing pouch.
The standing pouch according to any one of aspects 1 to 4.
<Aspect 6> The standing pouch according to any one of aspects 1 to 5, wherein the front sheet, the back sheet, and the bottom sheet are heat-sealed at least at the bottom seal portion and the side seal portion.
<Aspect 7> The adhesive layer is a thermosoftening resin,
The lamination strength at 25° C. between the outer layer and the inner layer is 1.5 N/15 mm or more,
The lamination strength at 70° C. between the outer layer and the inner layer is less than 1.5 N/15 mm,
The laminate strength is measured by T-peeling in accordance with JIS K6854-3:1999 at a rate of 300 mm/min and by calculating the average displacement in a range of 20 to 50 mm.
The standing pouch according to any one of aspects 1 to 6.
<Aspect 8> The standing pouch according to any one of aspects 1 to 7, wherein the adhesive layer has an adhesive strength of 1.0 N/25 mm or more according to JIS Z0237.
<Aspect 9> The standing pouch according to any one of aspects 1 to 8, which is for use in a microwave oven.

According to the present invention, it is possible to provide a standing pouch in which steam generated from the contents due to heating can be discharged from the intended position of the side seal portion and/or the top seal portion of the pouch.

FIG. 1 is a front view of a standing pouch according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of a composite film constituting a standing pouch according to an embodiment of the present invention. FIG. 1 is a schematic view of a composite film used in a standing pouch according to an embodiment of the present invention when steam is removed. FIG. 2 is a front view of the standing pouch of Example 1. FIG. 3 is a front view of the standing pouch of Example 2. FIG. 7 is a front view of the standing pouch of Example 3. FIG. 4 is a front view of the standing pouch of Example 4. FIG. 7 is a front view of the standing pouch of Example 5. FIG. 6 is a front view of the standing pouch of Example 6. FIG. 7 is a front view of the standing pouch of Example 7. FIG. 8 is a front view of the standing pouch of Example 8. FIG. 9 is a front view of the standing pouch of Example 9. FIG. 7 is a front view of the standing pouch of Example 10. FIG. 7 is a front view of the standing pouch of Example 11. FIG. 3 is a front view of a standing pouch of Comparative Example 1. FIG. 3 is a front view of a standing pouch of Comparative Example 2. FIG. 3 is a front view of a standing pouch of Comparative Example 3. FIG. 3 is a front view of the standing pouch of Reference Example 1. FIG. 3 is a front view of a standing pouch of Reference Example 2. FIG. 7 is a front view of a standing pouch of Reference Example 3. FIG. 4 is a front view of a standing pouch of Reference Example 4. FIG. 7 is a front view of a standing pouch of Reference Example 5. FIG. 6 is a front view of a standing pouch of Reference Example 6. FIG. 7 is a front view of a standing pouch of Reference Example 7. FIG. 7 is a front view of a standing pouch of Reference Example 8. FIG. 7 is a front view of a standing pouch of Reference Example 9. FIG. 7 is a front view of the standing pouch of Reference Example 10. FIG. 7 is a front view of the standing pouch of Reference Example 11. FIG. 3 is a front view of a standing pouch of Reference Comparative Example 1. FIG. 3 is a front view of a standing pouch of Reference Comparative Example 2. FIG. 7 is a front view of a standing pouch of Reference Comparative Example 3.

《Standing pouch》
The standing pouch of the present invention, as shown in FIG. 1(a), FIG. 2 and FIG.
A standing pouch in which a front sheet 11, a back sheet, and a bottom sheet are heat-sealed at least at a top seal portion 12 and a side seal portion 13 to form a storage portion 14 for accommodating contents,
At least one of the front sheet 11 and the back sheet is made of a composite film 10 in which at least an outer layer 1, an adhesive layer 2, and an inner layer 3 are laminated in this order, and are opposed to each other with the inner layer 3 interposed therebetween. The front sheet 11 and the back sheet are heat-sealed to form the upper seal part 12 and the side seal part 13,
The composite film 10 includes a half cut H that is applied from the inner layer 3 side and reaches the adhesive layer 2,
The half cut H is arranged so as to reach from the accommodating part side of the standing pouch 100 to the outer peripheral side of the standing pouch 100,
At least a portion of the side seal portion 13 constitutes a wide side seal portion 13a that is wider than other portions of the side seal portion 13 in a portion where the half cut H is not present. ,
It is a standing pouch.

According to the standing pouch of the present invention, steam generated from the contents due to heating can be discharged from the intended position of the side seal portion and/or the top seal portion of the pouch. This will be explained with reference to the drawings.

FIG. 1(a) is a front view of a standing pouch formed using the above-described composite film as a front sheet, and FIG. 2 is a sectional view of the composite film used as a front sheet. Moreover, FIG. 3 is a schematic diagram when the composite film used for the standing pouch is venting steam.

The composite film 10 that becomes the front sheet 11 of the standing pouch 100 shown in FIG. 1(a) is a laminate consisting of an outer layer 1, an adhesive layer 2, and an inner layer 3 shown in FIG. As shown in FIG. 1, the composite film 10 that becomes the front sheet 11 has each layer extending in the XY plane formed in the X direction and the Y direction, and the Z direction (not shown) is the composite film 10. It is in the thickness direction. That is, FIG. 1 is a front view of the standing pouch 100 seen from the outer layer 1 side.

In the composite film 10 constituting the standing pouch 100 shown in FIG. It is arranged so as to cross the side seal portion 13 of and reach the outer peripheral side of the standing pouch 100.

When such a standing pouch 100 is heated and steam is generated from the contents filled in the storage part 14 of the standing pouch 100, the generated steam 17 is transferred to the standing pouch 100, as shown in FIG. 1(a). It is discharged to the outside of the standing pouch 100 from the half cut line H reaching the outer peripheral side of the pouch 100.

Here, the effect of the steam 17 being discharged to the outside of the standing pouch 100 from the notch 15 of the side seal portion 13 will be explained using FIG. 3.

FIG. 3 shows a cross-sectional view of the composite film 10, which is the front sheet 11 of the standing pouch 100, in the Z direction (not shown). A state in which the adhesive layer 2 of the composite film 10 is peeled off by the steam 17 when steam 17 is generated, particularly a state in which the adhesive layer 2 of the composite film 10 is softened and peeled off, is shown.

The steam 17 generated inside the standing pouch 100 enters the composite film 10 in the thickness direction (Z direction) through the half-cut H formed in the inner layer 3 of the composite film 10, and when it reaches the adhesive layer 2, it directly breaks the adhesive. Apply heat to layer 2. This softens the adhesive layer 2 and makes it flexible.

The pressure inside the standing pouch 100 increases due to the pressure of the steam 17 generated from the contents. Then, as shown in FIG. 3, delamination occurs between the softened adhesive layer 2 and the inner layer 3 due to the increase in internal pressure, and the adhesive layer 2 is pushed to the outer peripheral side of the standing pouch 100 by the pressure of the steam 17. It lifts up, and a space 6 is formed in the peeled part.

Then, the steam 17 generated from the contents moves to the side seal part 13 through the space 6 developed in the area of the half-cut H, and when it reaches the outer periphery of the standing pouch 100, from the half-cut H in the outer periphery, It is discharged to the outside of the standing pouch 100.

At this time, due to the presence of the wide side seal part 13a, the pressure of the steam generated from the contents is locally applied to the part where the wide side seal part 13a is not present, that is, the part where the half cut H is present. By making it easier to apply the pressure, the discharge of steam from the half-cut H is promoted, so it is thought that the discharge of steam from unintended portions is suppressed.

The use of the standing pouch of the present invention is not particularly limited. The content that can be filled may be a gel or a liquid material including a paste or the like. Examples of liquid substances include pharmaceuticals, quasi-drugs, cosmetics, detergents, foods, and paints.

Examples of pharmaceuticals and quasi-drugs include injections, infusions, infusions, perfusions, and decoctions. Examples of cosmetics include shampoos, conditioners, hair styling products (eg, hair water, hair liquid, grease, etc.). Examples of detergents include neutral detergents, alkaline detergents, and acidic detergents. Examples of foods include beverages, edible oils, soups, creams, liquid seasonings (for example, soy sauce, vinegar, noodle soup, warishita, mirin, Worcestershire sauce, dressings, ketchup, Tabasco, sweeteners, etc.). Examples of the paint include paint, varnish, oil stain, and the like.

Note that the contents may be gel-like, gel-like, or paste-like contents, such as toothpaste, wasabi, jelly, jam, miso, and the like.

Since the standing pouch of the present invention is capable of discharging steam generated from the contents upon heating, it is very useful as a standing pouch for microwave ovens by taking advantage of this effect. Therefore, it is very useful for foods that are heated in a microwave oven while the contents are stored in a standing pouch.

The standing pouch of the present invention may further include a notch 15 and a convex seal portion 16, as shown in FIG. 1(b).

Below, each structure of the standing pouch of the present invention will be explained.

<Front sheet, back sheet and bottom sheet>
As described above, in the standing pouch of the present invention, the front sheet, the back sheet, and the bottom sheet are heat-sealed at least at the top seal portion and the side seal portion to form a storage portion for accommodating the contents. Has a structure.

Further, at least one of the front sheet and the back sheet is made of a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order, and the opposing front sheet and back sheet are connected to each other through the inner layer. It is heat sealed to form a top seal and a side seal.

FIG. 1(a) shows a front view of a standing pouch 100 according to an embodiment of the present invention. In the standing pouch of the present invention, a front sheet 11, a back sheet (not shown), and a bottom sheet (not shown) are heat-sealed at least at the top seal section 12 and the side seal section 13, so that the contents can be sealed. A accommodating portion 14 is formed.

In the standing pouch 100 shown in FIG. 1(a), a front sheet 11, a back sheet, and a bottom sheet are formed of one continuous composite film. Such a standing pouch can be manufactured, for example, as follows.

Specifically, one sheet of composite film comprising at least an outer layer, an adhesive layer, and an inner layer is used, and folded into a mountain at two locations that will become the bottom of a standing pouch so that the inner layer is on the inside, and By valley-folding along the folding line indicated by F in (a), the region that will become the bottom sheet is folded in, and a region that will become the front sheet 11 and a region that will become the back sheet are formed. Next, the body of the standing pouch 100 is formed by overlapping and heat-sealing both sides of the area that will become the front sheet 11, both sides of the folded bottom sheet, and both sides of the area that will become the back sheet. Side seal portions 13 are formed on both sides.

The front sheet, back sheet, and bottom sheet may be one continuous composite film as described above, each may be an independent discontinuous sheet, or a portion may be It may be a combination of continuous sheets and discontinuous sheets.

Further, in the standing pouch of the present invention, at least one of the front sheet and the back sheet may be formed from a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order. When only one of the front sheet and the back sheet is the composite film, the other sheet is heat-sealed with the inner layer of the composite film to form the top seal portion and the side seal portion.

If at least one of the front sheet and the back sheet is not formed from a composite film, the sheet is not particularly limited and may be selected as appropriate depending on the performance desired to be imparted to the standing pouch to be produced. be able to.

<Top seal part and side seal part>
The upper seal portion and the side seal portion are layers in which the front sheet and the back sheet are heat-sealed.

<Bottom seal part>
The bottom seal part is an optional seal part that heat-seals the bottom sheet and the front sheet and/or the back sheet when the bottom sheet is composed of a sheet separate from the front sheet and/or the back sheet. be.

<Wide side seal part>
The wide side seal portion is a portion of the side seal portion that is present in the portion where the half cut is not present. The presence of this wide side seal makes it easier to locally apply the steam pressure generated when the contents are heated to the area where the half-cut is present, thereby reducing steam from the half-cut. This facilitates the discharge of steam, and as a result, it is possible to suppress the discharge of steam from unintended areas.

The wide side seal portion may be present on one or both of the side seal portions, but it is preferable that the wide side seal portion be present on both sides from the viewpoint of localizing the pressure caused by steam.

It is preferable that the wide side seal portion be in contact with the bottom sheet from the viewpoint of suppressing pressure dispersion. In particular, when the standing pouch of the present invention has a bottom seal, it is preferable that the wide side seals are in contact with the bottom seal.

The wide side seal portion occupies 30% or more, 35% or more, 40% or more, 45% or more, or 50% or more of the height of the side seal portion on the content side of the standing pouch. This is preferable from the viewpoint of localizing the pressure caused by the half-cut line well, thereby promoting the discharge of steam from the position where the half-cut line exists. The wide side seal may occupy no more than 80%, no more than 75%, no more than 70%, no more than 65%, or no more than 60% of the height of the side seal on the contents side of the standing pouch. Here, "width" and "height" refer to the lengths in the normal direction and the direction parallel to the side edges of the standing pouch, respectively.

The width of the wide side seal part is 115% or more, 120% or more, 125% or more, 130% or more, 135% or more, 140% or more, 145% or more, 150% or more, 155% of the width of the side seal part. Occupying 160% or more, 170% or more, or 180% or more allows the pressure caused by steam to be localized well, thereby promoting the discharge of steam from the position where the half-cut line exists. Preferable from this point of view. This width may be 300% or less, 280% or less, 250% or less, 240% or less, 230% or less, or 220% or less of the width of the side seal portion.

<half cut>
The composite film used in the present invention comprises half cuts made from the side of the inner layer and reaching the adhesive layer. Therefore, the standing pouch of the present invention produced using the composite film as at least one of the front sheet and the back sheet includes a half cut made from the inner layer side of the composite film and reaching the adhesive layer. There is.

Here, the term "half cut" refers to a cut that is formed in the thickness direction of the composite film and does not penetrate through the composite film in the thickness direction.

The half-cut in the standing pouch of the present invention is arranged so as to cross the side seal portion from the accommodating portion side of the standing pouch to reach the outer circumference side of the standing pouch. According to this, when heating with a microwave oven or the like, steam can be vented from the location reached by the half cut existing on the outer peripheral side of the standing pouch, and the side seal portion and/or the top seal portion can be removed. By providing these at the intended positions, it becomes possible to vent steam from the intended positions.

The standing pouch of the present invention uses a composite film with half cuts for at least one of the front sheet and the back sheet, and the inner layer of the composite film is heat-sealed with the opposing front sheet and back sheet. Therefore, the inner layer becomes the inside of the standing pouch, that is, the layer that comes into contact with the contents. Therefore, the steam generated from the contents due to heating enters the composite film in the thickness direction through the half-cut.

FIG. 2 shows a cross-sectional view of an embodiment of the composite film used in the present invention. The composite film 10 shown in FIG. 2 includes an outer layer 1 , an adhesive layer 2 laminated inside the outer layer 1 , and an inner layer 3 laminated inside the adhesive layer 2 .

In the composite film 10 shown in FIG. 2, the half-cut H is provided from the inner layer 3 side and reaches the surface of the adhesive layer 2.

Note that the half cut may extend to the surface of the adhesive layer, may extend to the inside of the adhesive layer, or may penetrate the adhesive layer.

From the viewpoint of ensuring the strength of the standing pouch, it is preferable that the half cut does not reach the outermost layer of the composite film.

In particular, it is preferable that the half-cut be applied only to the inner layer. If only the inner layer can be half-cut, the effects of the present invention can be enjoyed in a state where the strength of the standing pouch is maximized.

The shape of the half cut may be either a continuous line or an intermittent line. Further, the number is not limited as long as at least one is provided. When providing a plurality of half cuts, it is preferable that the half cuts are substantially parallel to each other.

Further, the length of the half cut is not particularly limited. The length may be such that it is provided only at the location where steam release is desired, or it may be provided over the entire width of the standing pouch.

The method of forming the half-cut is not particularly limited, and for example, a method of forming the composite film and then using a laser or the like may be mentioned.

Alternatively, a half cut may be made during production of the composite film, and the layer having the half cut and other layers may be laminated to form the composite film used in the present invention. In this case, for example, the inner layer is cut through in the thickness direction of the inner layer using a rotary die cutter (half-cut production process), and then the adhesive layer and the outer layer are laminated on the inner layer (lamination process). One method is to do so.

<Convex seal part>
The standing pouch of the present invention may include a convex seal portion protruding toward the accommodating portion of the standing pouch on the side seal portion and/or the top seal portion.

When the convex seal portion is provided, the half cut is arranged so as to cross the convex seal portion from the accommodating portion side of the standing pouch to the side edge and reach the accommodating portion side of the standing pouch. In particular, when the standing pouch has an unsealed portion, a notch, and/or a notch, the half-cut may be arranged to reach the unsealed portion, notch, and/or notch.

The convex seal portion is a seal portion formed by heat-sealing the inner layer of the front sheet and the inner layer of the back sheet that face each other.

The standing pouch 100 shown in FIG. 1(b) has a side seal portion 13 that protrudes from the side edge of the standing pouch 100 (the side edge of the side seal portion 13) toward the accommodating portion 14 of the standing pouch. It has one notch 15 in the shape of a triangle. A triangular convex seal portion 16 is provided on the accommodating portion 14 side of the notch 15, which protrudes toward the accommodating portion 14 side of the standing pouch 100.

The triangular convex seal portion 16 has its base at the side edge of the accommodating portion 14 of the standing pouch 100 (the end of the side seal portion 13 on the accommodating portion 14 side), and its apex protrudes inside the accommodating portion 14 of the standing pouch 100. It is formed as follows.

Further, a half cut H is arranged so as to pass through the triangular vertex of the convex seal portion 16, cross the convex seal portion 16, and reach the triangular vertex of the notch 15.

When the standing pouch of the present invention has a convex seal part, the steam generated from the contents applies greater pressure to the convex seal part compared to other parts, so steam can be more easily released from the intended position. It becomes possible to implement the following.

The shape of the convex seal part is not particularly limited. It may be of various shapes such as a triangle, a quadrangle, a polygon, or a semicircle. Among these, triangles, quadrilaterals, and polygons having corners are preferred, and triangles are more preferred, from the viewpoint of making use of stress concentration due to steam pressure.

<Unsealed areas, notches, and/or notches>
The standing pouch of the present invention has at least one kind selected from the group consisting of an unsealed part where the front sheet and the back sheet are not heat-sealed, a notch, and a notch in the side seal part and/or the top seal part. You may have one. In this case, the unsealed parts, cuts, and/or notches are the side edges of the standing pouch (outer edges of the standing pouch in the side sealed areas) and/or the upper edges (outer edges of the standing pouch in the upper sealed areas). ) is formed so as to protrude toward the accommodating portion of the standing pouch from the starting point.

The unsealed portion where the front sheet and the back sheet are not heat-sealed, which the standing pouch of the present invention may have, is a portion where the front sheet and the back sheet are not bonded to each other.

The method for producing the unsealed portion is not particularly limited, but for example, when forming the side seal portion and/or the top seal portion, a region to which no heat is applied may be provided in the sealed region. It can be made with Alternatively, the front sheet and the back sheet may be heat-sealed to form the side seal portion and/or the top seal portion, and then a portion of the side seal portion and/or the top seal portion may be peeled off. , an unsealed portion can be created.

The notch that the standing pouch of the present invention may have is the side edge of the standing pouch (the outer end of the standing pouch in the side seal part) and/or the upper edge (the outer end of the standing pouch in the upper seal part). A linear cut starting from , which can be a straight or curved cut.

The method for making the incision is not particularly limited, but for example, after forming the side seal part and/or the top seal part, the side edge of the standing pouch (the outer end of the standing pouch in the side seal part) ) and/or the upper edge (the outer edge of the standing pouch in the top seal), move the cutter, knife, scissors through the side seal and/or the top seal toward the receiving part of the standing pouch. It can be produced by cutting using a cutting tool such as. Alternatively, cutouts may be made in the sides and/or top of both the front sheet and the back sheet, and the cutouts may be aligned and the front sheet and backsheet may be heat-sealed to form the sides with the cutouts. A seal portion and/or an upper seal portion may be produced. Alternatively, cuts may be made in the side and/or top of at least one of the front sheet and the back sheet made of the above-mentioned composite film to produce a side seal part and/or a top seal part having the cuts. good.

The notch that the standing pouch of the present invention may have is the side edge of the standing pouch (the outer edge of the standing pouch in the side seal part) and/or the upper edge (the outer edge of the standing pouch in the upper seal part). ) is a cutout with a certain amount of area.

The shape of the cutout is not particularly limited, and for example, the bottom side is the side edge of the standing pouch (the outer edge of the standing pouch in the side seal part) and/or the upper edge (the outer edge of the standing pouch in the upper seal part). The shape may be various shapes such as a triangle, a quadrangle, a polygon, or a semicircle.

The method for making the notch is not particularly limited, but for example, after forming the side seal part and/or the top seal part, the side edge of the standing pouch (the outer edge of the standing pouch in the side seal part) Cut inside the side seal part and/or top seal part using a cutting tool such as a knife or scissors so that the top edge (the outer edge of the standing pouch in the top seal part) and/or the top edge (the outer edge of the standing pouch in the top seal part) becomes the bottom. It can be manufactured by cutting out a desired shape. Alternatively, the sides and/or tops of the front and back sheets may be coated with the desired amount, such that the side edges (outer edges of the sheets) and/or the top edges (outer edges of the sheets) are the bottom sides, respectively. A side seal part and/or an upper seal part having a cutout may be produced by making a cutout in the shape of the cutout, aligning the cutouts, and heat-sealing the front sheet and the back sheet. Further, cutouts are made in the side and/or upper part of at least one of the front sheet and the back sheet made of the above-mentioned composite film, thereby producing a side seal part and/or a top seal part having the cutouts. You can.

The standing pouch 100 shown in FIG. 1(b) includes one triangular notch 15 in the side seal portion 13. The cutout 15 is formed to protrude toward the accommodating portion 14 of the standing pouch from the side edge of the standing pouch 100 (the side end of the side seal portion 13). Specifically, the side seal portion is arranged such that the side edge of the standing pouch 100 (the outer end of the standing pouch 100 of the side seal portion 13) becomes the bottom and the apex protrudes toward the accommodation portion 14 side of the standing pouch 100. 13 is cut out to form a triangular cutout 15.

In the standing pouch 100 of this embodiment shown in FIG. 1(b), steam 17 can be discharged from the notch 15 by heating with a microwave oven or the like.

Below, the structure of the composite film that constitutes the front sheet, back sheet, and bottom sheet will be explained.

<Composite film>
The composite film used in the standing pouch of the present invention is a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order. As described above, the half cut is provided from the inner layer side and reaches the adhesive layer.

FIG. 2 shows a cross-sectional view of an embodiment of the composite film used in the present invention. The composite film 10 shown in FIG. 2 includes an outer layer 1 , an adhesive layer 2 laminated inside the outer layer 1 , and an inner layer 3 laminated inside the adhesive layer 2 .

In the composite film 10 shown in FIG. 2, the half-cut H is provided from the inner layer 3 side and reaches the surface of the adhesive layer 2.

The composite film used in the present invention includes an outer layer, an adhesive layer, and an inner layer as essential components, and it is sufficient if these are laminated in this order. In the present invention, an arbitrary layer may be provided in addition to the outer layer, adhesive layer, and inner layer. Examples of the arbitrary layer include a barrier layer for imparting barrier properties and a layer for reinforcing strength. Examples include a reinforcing layer or an adhesive layer for bonding between layers.

The arrangement of the arbitrary layers is not particularly limited, and for example, they may be present between the outer layer, the adhesive layer, and the inner layer, or on the outside of the laminate including these layers.

In addition, in the case of a structure in which no layer other than the adhesive layer is disposed between the outer layer and the inner layer, the manufacturing process of the composite film can be simplified, which contributes to production capacity and production cost. Can be done.

The thickness of each layer constituting the composite film used in the present invention can be appropriately determined depending on the purpose of the standing pouch to be formed.

(outer layer)
The outer layer is an essential constituent layer in the composite film used for the standing pouch of the present invention.

The composite film used in the standing pouch of the present invention has an outer layer, an adhesive layer, and an inner layer laminated in this order. Therefore, the outer layer can serve as a protective layer when a standing pouch is formed by heat-sealing the inner layer, which is the innermost layer. It can also serve as a printing layer for printing to display contents, etc.

The outer layer is a layer that includes at least a base resin layer.

(Base resin layer)
For the base resin layer, thermoplastic resins with excellent impact resistance, abrasion resistance, etc., such as polyolefin resins, vinyl polymers, polyesters, polyamides, etc., may be used alone or in combination of two or more types. Can be used in multiple layers.

Examples of the polyolefin resin include polyethylene resin, polypropylene resin, and the like.

In this specification, the polyethylene resin is a resin containing more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more of ethylene group repeating units in the main chain of the polymer, and for example, has a low density. Polyethylene (LDPE, density 0.925 g/m ³ or less), linear low density polyethylene (LLDPE, density 0.925 g/m ³ or less), medium density polyethylene (MDPE, density 0.925 g/m ³ or less 0.942 g) / ^m3 or less), high-density polyethylene (HDPE, density greater than 0.942g/ ^m3 ), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), ethylene-vinyl acetate copolymer (EVA), carboxylic acid-modified polyethylene, carboxylic acid-modified ethylene vinyl acetate copolymer, ionomer, and derivatives thereof, and selected from the group consisting of mixtures thereof.

In this specification, the polypropylene resin is a resin containing more than 50 mol%, 60 mol% or more, 70 mol% or more, or 80 mol% or more of repeating units of propylene groups in the main chain of the polymer, such as polypropylene (PP). Examples include homopolymers, random polypropylene (random PP), block polypropylene (block PP), chlorinated polypropylene, acid-modified polypropylene, derivatives thereof, and mixtures thereof.

Examples of vinyl polymers include polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polychlorotrifluoroethylene, polytetrafluoroethylene, and polyacrylonitrile (PAN).

Examples of the polyester include polyethylene terephthalate (PET) and polybutylene terephthalate.

Examples of the polyamide include nylon such as nylon (registered trademark) 6 and nylon MXD6.

The thickness of the base resin layer is preferably 7 μm or more, 10 μm or more, or 15 μm or more from the viewpoint of good protection of the barrier layer, and the thickness of the base resin layer is preferably 55 μm or less, 50 μm or less, or 45 μm or less. This is preferable from the viewpoint of improving handling properties when used as a pouch.

The resins constituting the base resin layer are not limited to one type, but may be a blend of two or more types, and additives may be added to impart functionality, etc., as necessary. good.

Note that the base resin layer is preferably made from a pre-formed film. The film serving as the base resin layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among these, biaxially stretched films are preferred.

(Adhesive layer)
The adhesive layer is an essential constituent layer in the composite film used for the standing pouch of the present invention. An adhesive layer is disposed between the outer layer and the inner layer.

When the composite film used in the standing pouch of the present invention has a structure in which no layer other than the adhesive layer is disposed between the outer layer and the inner layer, the manufacturing process of the composite film can be simplified. , can contribute to production capacity and production costs.

The material for the adhesive layer is not particularly limited, and examples thereof include polyolefin, polyester, polyether, polyamide, polylactic acid, thermoplastic elastomer, and the like.

(laminate strength)
The adhesive layer of the composite film used in the standing pouch of the present invention may be an adhesive layer made of a thermoplastic resin that provides a specific lamination strength. Specifically, the adhesive layer has a lamination strength of 1.5 N/15 mm or more at 25°C between the outer layer and the inner layer, and a lamination strength of 1.5 N/15 mm or more at 70°C between the outer layer and the inner layer. It may be a thermosoftening resin that is less than 15 mm. The laminate strength can be measured by T-peeling in accordance with JIS K6854-3:1999 at a rate of 300 mm/min and by determining the average displacement in a range of 20 to 50 mm.

If the lamination strength at 25°C between the outer layer and the inner layer is 1.5 N/15 mm or more, the standing pouch formed from the composite film will have sufficient strength at around room temperature and will be able to withstand the outer layer during storage and handling. No peeling occurs between the inner layer and the inner layer.

The lamination strength at 25°C between the outer layer and the inner layer is 1.8 N/15 mm or more, 2.0 N/15 mm or more, 2.4 N/15 mm or more, 2.8 N/15 mm or more, or 3.0 N/15 mm or more. It's good.

On the other hand, the lamination strength at 25° C. between the outer layer and the inner layer may be so strong that the material is destroyed during peeling when the above T-peel is performed, or 6.0 N/15 mm. Below, it may be 5.0 N/15 mm or less, 4.5 N/15 mm or less, 4.0 N/15 mm or less, 3.5 N/15 mm or less, or 3.0 N/15 mm or less.

In addition, if the lamination strength at 70°C between the outer layer and the inner layer is less than 1.5 N/15 mm, spaces will be formed in the adhesive layer when the standing pouch formed from the composite film is heated. By moving the steam through this space, it is possible to achieve the same steam removal performance as before.

The lamination strength at 70°C between the outer layer and the inner layer is 1.2 N/15 mm or less, 1.0 N/15 mm or less, 0.8 N/15 mm or less, 0.5 N/15 mm or less, 0.2/15 mm or less, 0 .1/15 mm or less, or 0.05 N/15 mm or less.

On the other hand, the lamination strength at 70°C between the outer layer and the inner layer is 0.01 N/15 mm or more, 0.05 N/15 mm or more, 0.1 N/15 mm or more, 0.2 N/15 mm or more, 0.3 N/15 mm. It may be 0.4 N/15 mm or more, or 0.5 N/15 mm or more.

When the adhesive layer of the composite film used in the standing pouch of the present invention has the above lamination strength, the lamination strength between the outer layer and the inner layer at 25°C is greater than the lamination strength at 70°C. There is. In other words, when a standing pouch formed from a composite film is heated in a microwave oven or the like, the laminate strength between the outer layer and the inner layer decreases due to the temperature rise, which causes the inside of the soft resin layer, which is the adhesive layer, to decrease. It becomes easier to create a space. Steam generated from the contents can then be moved through the formed space.

In addition, when the adhesive layer of the composite film used in the standing pouch of the present invention has the above-mentioned lamination strength, a structure in which only one adhesive layer made of thermoplastic resin is disposed between the outer layer and the inner layer may be used. However, it is possible to realize a standing pouch with steam release performance equivalent to that of the conventional method.

Examples of commercially available thermosoftening resins that can achieve the above lamination strength include LX-500 (DIC Corporation), ELITEL (registered trademark) XP-1648-45EA (Unitika Corporation), and the like. Further, the thermosoftening resin capable of achieving the above lamination strength may be a thermosoftening resin having a crosslinked structure derived from an adhesive composition containing a main agent and a curing agent. This adhesive composition is described in detail below.

The adhesive layer of the composite film used in the standing pouch of the present invention may have an adhesive strength of 1.0 N/25 mm or more according to JIS Z0237.

If the adhesive layer has an adhesive strength of 1.0 N/25 mm or more according to JIS Z0237, it has sufficient adhesion with the adjacent layer, so it can be used when storing and handling a standing pouch formed from a composite film. In this case, problems such as peeling can be avoided.

In addition, since there is no need to provide a layer to strengthen adhesion between the outer layer and the inner layer, the manufacturing process of the composite film can be simplified, contributing to production capacity and production costs. can.

The adhesive strength of the adhesive layer according to JIS Z0237 is 1.5N/25mm or more, 2.0N/25mm or more, 2.5N/25mm or more, 3.0N/25mm or more, 3.5N/25mm or more, 4.0N /25mm or more, or 4.5N/25mm or more.

On the other hand, the adhesive strength of the adhesive layer according to JIS Z0237 is 10.0 N/25 mm or less, 9.0 N/25 mm or less, 8.0 N/25 mm or less, 7.0 N/25 mm or less, 6.0/25 mm or less, It may be 5.0/25 mm or less, or 4.0 N/25 mm or less.

(Adhesive layer: adhesive composition)
The adhesive composition may contain a base agent and a curing agent.

The main agent constituting the adhesive composition is not particularly limited, but it is preferably liquid at room temperature from the viewpoint of facilitating dry lamination to the base layer. Examples of polyols include polycarbonate polyols, polycaprolactone polyols, polyester polyols, polyether polyols, polyolefin polyols, acrylic polyols, silicone polyols, castor oil polyols, fluorine polyols, and the like. The base ingredients may be used alone or in combination of two or more types.

Among these, polyester polyols or polyether polyols are preferably used, and from the viewpoint of rapid curing, at least one polyol selected from the group consisting of polyester polyurethane polyols and polyether polyurethane polyols may be more preferred.

Particularly suitable is a polyether polyol that can form an ether resin layer, and the polyether polyol may be a polyether polyurethane polyol.

{hardening agent}
The curing agent constituting the adhesive composition is not particularly limited, but from the viewpoint of facilitating dry lamination to the base layer, one that is liquid at room temperature is preferred. Examples of the curing agent include polyisocyanate.

Examples of the polyisocyanate include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, and 1,3-butylene diisocyanate. , 2,4,4-trimethylhexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, aliphatic diisocyanates such as 2,6-diisocyanatomethyl caproate, 1,3-cyclopentane diisocyanate, 1, 4-Cyclohexane diisocyanate, 1,3-cyclohexane diisocyanate, 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate, 4,4'-methylenebis(cyclohexyl isocyanate), methyl 2,4-cyclohexane diisocyanate, methyl 2, Alicyclic diisocyanates such as 6-cyclohexane diisocyanate, 1,4-bis(isocyanatomethyl)cyclohexane, 1,3-bis(isocyanatomethyl)cyclohexane, m-phenylene diisocyanate, p-phenylene diisocyanate, 4,4-diphenyl Diisocyanate, 1,5-naphthalene diisocyanate, 4,4'-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate or 2,6-tolylene diisocyanate or mixtures thereof, 4,4'-toluidine diisocyanate, dianisidine diisocyanate, 4, Aromatic diisocyanates such as 4'-diphenyl ether diisocyanate, 1,3-xylylene diisocyanate, 1,4-xylylene diisocyanate, tetramethylxylylene diisocyanate or mixtures thereof, ω,ω'-diisocyanate-1,4-diethylbenzene, etc. Aromatic or araliphatic organics such as araliphatic diisocyanate, triphenylmethane-4,4'4"-triisocyanate, 1,3,5-triisocyanatebenzene, 2,4,6-triisocyanatetoluene, etc. Examples include polyisocyanate monomers such as organic tetraisocyanates represented by aromatic aliphatic tetraisocyanates such as triisocyanate and 4,4'-diphenyldimethylmethane-2,2'-5,5'-tetraisocyanate. The polyisocyanate may be a derivative or adduct obtained by reacting these monomers with another compound, or a derivative such as a dimer or trimer derived from these monomers.

The composition ratio of the main agent and the curing agent contained in the adhesive composition is 0.20 parts by mass or less, 0.15 parts by mass or less, 0.125 parts by mass or less, 0. If the amount is 10 parts by mass or less, 0.075 parts by mass or less, or 0.05 parts by mass or less, the lamination strength at 70°C between the base layer and the heat-sealing layer will be weakened, and the vapor of the resulting composite film will be reduced. It is preferable from the viewpoint of improving the punching performance.

In addition, the composition ratio of the base agent and the curing agent contained in the adhesive composition is 0.01 part by mass or more, 0.025 part by mass or more, 0.05 part by mass or more of the hardening agent per 1 part by mass of the base resin, The content is preferably 0.075 parts by mass or more, 0.10 parts by mass or more, 0.125 parts by mass or more, or 0.15 parts by mass or more from the viewpoint of ensuring sufficient lamination strength at 25°C.

In particular, in the above configuration, the composition ratio of the base resin and the curing agent contained in the adhesive composition is such that the curing agent is more than 0.125 parts by mass and less than 0.2 parts by mass with respect to 1 part by mass of the base resin. This is preferable from the viewpoint of increasing the lamination strength at 25°C and lowering the lamination strength at 70°C.

(inner layer)
The inner layer is an essential constituent layer in the composite film used in the present invention.

The inner layer is a layer that includes at least a sealant layer on the accommodating side of the standing pouch. The inner layer may be a single sealant layer, or may be a laminate including layers other than the sealant layer on the adhesive layer side.

(Base resin layer)
As the base resin layer of the inner layer, the resins mentioned in connection with the base resin layer of the outer layer can be used.

(Inner layer: sealant layer)
The sealant layer becomes a layer that is heat sealed when forming a standing pouch. Therefore, the sealant layer is arranged to be the innermost layer of the composite film.

The material constituting the sealant layer is not particularly limited as long as it can be thermally bonded and can provide sufficient sealing strength to the formed standing pouch. Known materials can be used, such as the above-mentioned polyolefin resins.

Note that the sealant layer becomes a layer that forms a space for filling the contents in the standing pouch to be formed. Therefore, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or the like may be used to impart resistance to contents.

The sealant layer may be formed by applying a film pre-formed from the above-mentioned material to another layer constituting the inner layer, such as a base resin layer, via an adhesive layer, or by applying it to the surface of another layer constituting the inner layer. Alternatively, the material for forming the sealant layer may be melted and extruded, and then cooled and solidified.

In addition, the resins constituting the sealant layer may be not only one type, but also a blend of two or more types, and additives etc. for imparting functionality may be added as necessary. good.

Furthermore, the sealant layer may be a single layer or may have a multilayer structure.

(Other layers)
The composite film used for the standing pouch of the present invention may contain layers other than the outer layer, adhesive layer, and inner layer as essential constituent layers.

Other layers are not particularly limited, and include, for example, a barrier layer for providing barrier properties, a reinforcing layer for reinforcing strength, an adhesive layer for bonding between layers, etc. Can be mentioned.

As the barrier layer, a material that can suppress permeation of moisture, organic gas, and inorganic gas from the outside to the gas absorption layer can be used. Such a barrier layer may be, for example, a single metal foil layer such as a copper foil or an aluminum foil, an alloy foil layer such as a stainless steel foil, an inorganic vapor-deposited film such as a silica vapor-deposited film, an alumina vapor-deposited film, or a silica/alumina binary vapor-deposited film, or An organic coating film such as a polyvinylidene chloride coating film, a polychlorotrifluoroethylene coating film, or a polyvinylidene fluoride coating film can be used. These barrier layers may be laminated only as a barrier layer, or may be used in a state in which they are laminated in advance on the base resin layer of the outer layer or the inner layer.

When using an inorganic vapor deposited film as a barrier layer, the thickness of the barrier layer is preferably 100 nm or more, 200 nm or more, 300 nm or more, 500 nm or more, 700 nm or more, or 1 μm or more from the viewpoint of ensuring strength and barrier properties. , and preferably 5 μm or less, 4 μm or less, 3 μm or less, or 2 μm or less from the viewpoint of improving handleability when used as a packaging bag.

When using a metal foil layer, a barrier resin layer, or an organic coating film as a barrier layer, the thickness of the barrier layer is preferably 7 μm or more, 10 μm or more, or 15 μm or more from the viewpoint of ensuring strength and barrier properties. , and preferably 100 μm or less, 80 μm or less, 60 μm or less, 55 μm or less, 50 μm or less, 45 μm or less, 40 μm or less, or 35 μm or less from the viewpoint of improving handleability when used as a packaging bag.

Examples of the material of the reinforcing layer for reinforcing strength include paper, synthetic paper, and nonwoven fabric. These may be coated with an adhesive to provide adhesion to adjacent layers. Moreover, it is also possible to provide a layer made of the material constituting the base resin layer as a reinforcing layer separately from the base resin layer.

Examples of the adhesive layer for bonding between layers include layers made of ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ionomer.

Further, the other layer may be a layer made of an adhesive used when dry laminating or hot melt laminating the layers.

The resins and the like constituting the other layers may be not limited to one type, or may be a blend of two or more types. Additionally, additives and the like for imparting functionality and the like may be blended as necessary.

The present invention will be specifically explained with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

《Preparation of standing pouch》
<Example 1>
A composite film constituting a standing pouch having the following layer structure was produced (in the layer structure below, "//" means a dry lamination adhesive).
OPP/Thermosoftening resin layer (2.0g/m ² )/PET//Sealant layer

In the above layer structure, "OPP" corresponds to the outer layer of the present invention, "thermosoftening resin" corresponds to the adhesive layer of the present invention, and "PET//sealant layer" corresponds to the inner layer of the present invention. do.

The following materials were used as specific materials.
・OPP: Biaxially stretched PP film (Pyrene (registered trademark) P2161, Toyobo Co., Ltd., thickness: 20 μm)
・Thermosoftening resin layer: TM-396/CAT-22B (Toyo Morton Co., Ltd.)
- Sealant layer: unstretched PP (CPP) film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 50 μm)
・PET: PET film (Ester (registered trademark) film E5100, Toyobo Co., Ltd., thickness: 12 μm)
・Dry lamination adhesive: LX-500/KR-90S (DIC Corporation)

A PET film and a CPP film serving as a sealant layer were bonded together with an adhesive to produce an inner layer. Subsequently, intermittent linear cuts were made on the inner layer so as to penetrate the inner layer in the thickness direction (half-cut production step).

An OPP film serving as an outer layer was adhered to the PET film side of the inner layer having cuts using a heat-softening adhesive resin to produce a laminate serving as a composite film. The heat-softening adhesive resin used was a mixture of 8 parts by mass of TM-396 and 1 part by mass of CAT-22B and coated in an amount of 2.0 g/m ² .

The produced composite film was cut into a front sheet and a back sheet with a width of 140 mm and a height of 140 mm, and a bottom sheet with a width of 140 mm and a height of 60 mm, and these heat-sealed layers were made to face each other, and each sealed portion was sealed as shown below. A standing pouch with external dimensions of 140 mm in width, 140 mm in height, and 30 mm in folded width as shown in FIG. 4 was prepared. At this time, Kimwipe (registered trademark) L-100 (470 mm x 425 mm) and 20 g of water were filled inside the standing pouch.

The half-cut was arranged from one side seal of the standing pouch, across the accommodating section, to the other side seal, and across both side seals and the accommodating section. Note that heat sealing was performed using an impulse sealer under conditions of heating for 1.0 seconds and cooling for 2.0 seconds.

(Production of side seal part and wide side seal part)
The side seal part, the top seal part, and the bottom seal part were manufactured so that the width in the normal direction to the side edge of the standing pouch was 5 mm.

(Production of wide side seal part)
In addition, the width of the side seal part is 5 mm with respect to the edge of the storage part side, that is, the width of the side seal part in the normal direction with respect to the side edge of the standing pouch is 10 mm, and the height is 70 mm. A side seal part was made. Here, in Table 1, "width" and "height" indicate the length in the normal direction and the direction parallel to the side edge of the standing pouch, respectively.

(Preparation of convex seal part)
Next, attach two triangular convex seal parts to both side seal parts on the half-cut extension line so that the end of the standing pouch on the accommodating part side becomes the base and the apex protrudes inside the accommodating part. Formed. At this time, the half-cut is arranged so as to pass through the apex of the triangle, and the convex seal part has a width of 5 mm with respect to the edge of the side seal part on the side of the storage part, that is, the width is at right angles to the side edge of the standing pouch. The width in the linear direction was set to 10 mm.

<Examples 2 to 11 and Comparative Examples 1 to 3>
Standing pouches of Examples 2 to 11 and Comparative Examples 1 to 3 were produced in the same manner as Example 1, except that the configuration of the seal portion was changed as shown in Table 1.

(Preparation of notch)
For Examples and Comparative Examples where "Presence or absence of notch" is described as "Present" in Table 1, the outer edge of the standing pouch of the side seal part is Two equilateral triangular notches were made so that the base was the base and the apex was protruding toward the housing part. The width of the notch in the normal direction to the side edge of the standing pouch was 5 mm.

"evaluation"
<Steam permeability>
The prepared standing pouch was heated in a microwave oven (700W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the interlayer between the outer layer and the inner layer. Note that each standing pouch was microwaved three times and evaluated based on the following criteria.
◎: Steam was discharged in all three times.
○: Steam was discharged 2 out of 3 times.
Δ: Steam was discharged once out of three times.
×: Steam was not discharged in all three times.

<Steam passage position>
The prepared standing pouch was heated in a microwave oven (700W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the side seal portion on the extension line of the half cut. Note that each standing pouch was microwaved three times and evaluated based on the following criteria.
○: Steam was discharged from the side seal part on the extension line of the half cut all the times.
Δ: Among the times when steam was discharged, there were cases in which steam was not discharged from the side seal portion on the extension line of the half cut.
×: Among the times in which steam was discharged, there was no case in which steam was discharged from the side seal portion on the extension line of the half cut.

The configurations and evaluation results of Examples and Comparative Examples are shown in Table 1 and FIGS. 4 to 17.

From Table 1, the standing pouches of Examples having wide side seals have good vapor permeability and vapor permeation position, and among them, Examples 1 to 8 in which the wide side seals are in contact with the bottom and It can be seen that the standing pouch No. 11 has particularly good vapor permeability and vapor permeation location.

In the following, the effects of the convex seal portion, notch, etc. will be explained using a reference example.

<Reference Examples 1 to 11, Reference Comparative Examples 1 to 3>
In Reference Examples 1 to 11 and Reference Comparative Examples 1 to 3, standing pouches that are variations of standing pouches that do not have wide side seals were fabricated, and the vapor permeability and vapor flow when heated in a microwave oven were fabricated. The passing position was evaluated.

《Reference example 1》
[Preparation of standing pouch]
The same composite films as those produced in Examples 1 to 11 and Comparative Examples 1 to 3 were cut into front sheets and back sheets with a width of 140 mm and a height of 140 mm, and a bottom sheet with a width of 140 mm and a height of 60 mm, and these were heat-sealed. The layers were made to face each other, and each seal portion was provided as shown below, to produce a standing pouch having external dimensions of 140 mm in width, 140 mm in height, and 30 mm in folded width, as shown in FIG. 18. At this time, Kimwipe (registered trademark) L-100 (470 mm x 425 mm) and 20 g of water were filled inside the standing pouch.

The half-cut was arranged from one side seal of the standing pouch, across the accommodating section, to the other side seal, and across both side seals and the accommodating section. Note that heat sealing was performed using an impulse sealer under conditions of heating for 1.0 seconds and cooling for 2.0 seconds.

(Preparation of side seal part)
In Reference Example 1, a standing pouch shown in FIG. 18 was produced. Specifically, the side seal part was produced so that the width (a) in the normal direction to the side edge of the standing pouch was 5 mm.

(Preparation of convex seal part)
Next, attach two triangular convex seal parts to both side seal parts on the half-cut extension line so that the end of the standing pouch on the accommodating part side becomes the base and the apex protrudes inside the accommodating part. Formed. At this time, the half-cut was arranged to pass through the apex of the triangle, and the convex seal portion had a width (b) of 5 mm in the normal direction to the side edge of the standing pouch.

(Preparation of notch)
Next, make two equilateral triangular notches on both side seals on the half-cut extension line so that the outer end of the standing pouch on the side seal becomes the base and the apex protrudes toward the storage area. Created. The width (c) of the notch in the normal direction to the side edge of the standing pouch was 5 mm.

(Relationship among the width a of the side seal part, the width b of the convex seal part, and the width c of the notch)
Therefore, the value of the following formula (1) in Reference Example 1 is 5 mm.
a+b-c (1)
(a: Width of the side seal part with the notch in the normal direction to the side edge of the standing pouch,
b: Width of the convex seal part in the normal direction to the side edge of the standing pouch,
c: Width of the notch in the normal direction to the side edge of the standing pouch)

《Reference example 2》
As shown in FIG. 19, a standing pouch was produced in the same manner as in Reference Example 1, except that the half cut was changed to pass through approximately the center of the upper side of the equilateral triangle serving as the convex seal portion.

《Reference example 3》
As shown in FIG. 20, a standing pouch was produced in the same manner as in Reference Example 1, except that the half-cut was changed to pass through approximately the center of the lower side of the equilateral triangle serving as the convex seal portion.

《Reference example 4》
As shown in FIG. 21, a standing pouch was produced in the same manner as in Reference Example 1, except that the shape of the convex seal portion was an acute triangle, and the shape of the notch was an acute triangle.

《Reference example 5》
As shown in FIG. 22, a standing pouch was produced in the same manner as in Reference Example 1 except that the shape of the convex seal portion was an obtuse triangle and the shape of the notch was an obtuse triangle.

《Reference example 6》
As shown in Figure 23, the reference example is the same except that the shape of the convex seal part is an acute triangle, and the width (b) of the convex seal part in the normal direction to the side edge of the standing pouch is 7 mm. A standing pouch was produced in the same manner as in Example 1. In this example, the value (a+b−c) of equation (1) is 7 mm.

《Reference example 7》
As shown in FIG. 24, a standing pouch was produced in the same manner as in Reference Example 1, except that a convex seal part and a notch were produced only on one side of the side seal part.

《Reference example 8》
As shown in FIG. 25, a standing pouch was produced in the same manner as in Reference Example 1, except that the convex seal portion was square in shape and a half cut was placed so as to pass approximately through the center of the square.

《Reference example 9》
As shown in FIG. 26, a standing pouch was produced in the same manner as in Reference Example 1, except that the shape of the convex seal portion was semicircular and the half cut was arranged so as to pass through approximately the center of the semicircle.

《Reference example 10》
As shown in FIG. 27, a standing pouch was prepared in the same manner as in Reference Example 1, except that the width (a) of the side seal part in the normal direction to the side edge of the standing pouch was 10 mm, and no convex seal part was created. was created. In this example, the width (b) of the convex seal portion in the normal direction to the side edge of the standing pouch is 0 mm, so the value (a+b−c) of equation (1) is 5 mm.

《Reference example 11》
[Preparation of standing pouch]
The heat-sealing layers of the produced composite film were made to face each other to produce a standing pouch having external dimensions of 140 mm in width, 140 mm in height, and 30 mm in folded width, as shown in FIG. 28. At this time, Kimwipe (registered trademark) L-100 (470 mm x 425 mm) and 20 g of water were filled inside the standing pouch.

The half-cut was arranged from the top seal of the standing pouch, across the accommodating section, and across both seals and the accommodating section to the bottom seal of the standing pouch. The conditions for manufacturing the standing pouch were heating for 1.0 seconds and cooling for 2.0 seconds using an impulse sealer.

(Preparation of upper seal part)
In Reference Example 11, a standing pouch shown in FIG. 28 was produced. Specifically, the upper seal part was produced so that the width (a) in the normal direction to the upper edge of the standing pouch was 5 mm.

(Preparation of convex seal part)
Next, one triangular convex seal part was formed on the upper seal part on the half-cut extension line so that the end of the standing pouch on the accommodating part side became the base and the apex protruded inside the accommodating part. At this time, the half-cut was arranged so as to pass through the apex of the triangle, and the convex seal portion had a width (b) of 5 mm in the normal direction to the upper edge of the standing pouch.

(Preparation of notch)
Subsequently, one equilateral triangular notch was made in the upper seal part on the half-cut extension line so that the outer end of the standing pouch in the upper seal part became the base and the apex protruded toward the storage part. The width (c) of the notch in the normal direction to the upper edge of the standing pouch was 5 mm.

(a+b-c)
Therefore, the value of the following formula (1) in Reference Example 11 is 5 mm.
a+b-c (1)
(a: Width of the upper seal part with the notch in the normal direction to the upper edge of the standing pouch,
b: Width of the convex seal part in the normal direction to the upper edge of the standing pouch,
c: Width of the notch in the normal direction to the upper edge of the standing pouch)

《Reference Comparative Example 1》
As shown in FIG. 29, a standing pouch was produced in the same manner as in Reference Example 1 except that the convex seal portion and the notch were not produced. In this example, the width (b) of the convex seal part in the normal direction to the side edge of the standing pouch and the width (c) of the notch in the normal direction to the side edge of the standing pouch are 0 mm. , the value (a+b−c) of equation (1) is 5 mm.

《Reference comparative example 2》
As shown in FIG. 30, a standing pouch was produced in the same manner as in Reference Example 1 except that no cutout was made. In this example, the width (c) of the notch in the normal direction to the side edge of the standing pouch is 0 mm, so the value (a+b−c) of equation (1) is 10 mm.

《Reference Comparative Example 3》
As shown in FIG. 31, the width (a) of the side seal part in the normal direction to the side edge of the standing pouch is 10 mm, and the same as Reference Example 1 except that the convex seal part and the notch are not created. A standing pouch was prepared. In this example, the width (b) of the convex seal part in the normal direction to the side edge of the standing pouch and the width (c) of the notch in the normal direction to the side edge of the standing pouch are 0 mm. , the value (a+b−c) of equation (1) is 10 mm.

《Evaluation of standing pouch》
<Steam permeability>
The prepared standing pouch was heated in a microwave oven (700W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the interlayer between the outer layer and the inner layer. Note that each standing pouch was microwaved three times and evaluated based on the following criteria. The results are shown in Table 2.
◎: Steam was discharged in all three times.
○: Steam was discharged 2 out of 3 times.
Δ: Steam was discharged once out of three times.
×: Steam was not discharged in all three times.

<Steam passage position>
The prepared standing pouch was heated in a microwave oven (700W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the side seal part or the top seal part on the extension line of the half cut. Note that each standing pouch was microwaved three times and evaluated based on the following criteria. The results are shown in Table 2.
○: Steam was discharged from the side seal part or top seal part on the extension line of the half-cut in all the times steam was discharged.
Δ: Among the times when steam was discharged, there were cases in which steam was not discharged from the side seal portion or the upper seal portion on the extension line of the half cut.
×: Among the times in which steam was discharged, there was no case in which steam was discharged from the side seal portion or the upper seal portion on the extension line of the half cut.

《Consideration》
From Reference Examples 1, 4, and 5, it can be seen that even if the shape of the convex seal part was acute or obtuse, it did not affect the steam passage and the steam passage position, and the steam could be discharged from the intended position. . In addition, from Reference Examples 1, 2, and 3, if the half-cut crosses the convex seal part, there is no effect on the steam passage and the steam passage position, and the steam can be discharged from the intended position. I understand. In addition, from Reference Example 8, even if a convex seal part and a notch are made only on one side of the side seal part, there is no effect on the steam passage and the position where the steam passes, and the steam is discharged from the intended position. I can see that it was done.

From Reference Example 1 and Reference Example 7, it can be seen that when the value of formula (1) is less than 10 mm, steam can be more reliably discharged from the intended position.

Reference Example 1, Reference Comparative Example 1, and Reference Comparative Example 2 show that in the case of a standing pouch in which the side seal portion does not have a notch, steam cannot be discharged from the intended position.

<Reference Examples 12 to 15, Reference Comparative Examples 4 to 8>
In Reference Examples 12 to 15 and Reference Comparative Examples 4 to 8, pillow bags were made from composite films, and the laminate strength was measured and the vapor permeability when heated in a microwave oven was evaluated.

[material]
In Reference Examples 12 to 15 and Reference Comparative Examples 4 to 8, the following materials were prepared for forming the layers.

(1) Outer layer ・Ny#15: Nylon film (Bonyl (registered trademark) RX, Kojin Film & Chemicals Co., Ltd., thickness: 15 μm)

(2) Heat-softening adhesive resin layer or adhesive layer ・LX-500 (DIC Corporation)
・Eritel (registered trademark) XP-1586-45EA
・Eritel (registered trademark) XP-1648-45EA (Unitika Co., Ltd.)
・LX-500/KW-75 (DIC Corporation)
・Eritel (registered trademark) XP-1541-45EA (Unitika Co., Ltd.)
・Eritel (registered trademark) UE-3223 (Unitika Co., Ltd.)
・TM-396/CAT-22B (Toyo Morton Co., Ltd.)

(3) Inner layer ・CPP #30: Unstretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 30 μm)
・E1901T #50: Laminated PP film (Differen (registered trademark) E1901T, DIC Corporation, thickness: 50 μm)

(4) Others - Peeling varnish: Polycoat (registered trademark) P-91/P-91 reducer = 3/1 (DIC Corporation)

《Reference Examples 12 to 15, Reference Comparative Examples 4 to 7》
[Manufacture of composite film]
Using the materials listed in Table 3, a film serving as an inner layer and a film serving as an outer layer were bonded together with a heat-softening adhesive resin or an adhesive to produce a laminate. Note that the coating amount of the heat-softening adhesive resin or adhesive was 1.5 g/m ² . Regarding "TM-396/CAT-22B", 1 part by mass of CAT-22B was added to 1 part by mass of TM-396.

The film that will become the inner layer in the laminate is cut through the inner layer in the thickness direction (half-cut production process), and then the outer layer and thermoplastic adhesive resin layer are laminated on the sheet containing the inner layer to form the half-cut. A composite film having the following properties was obtained.

《Reference Comparative Example 8》
[Manufacture of composite film]
Two coats of Polycoat (registered trademark) P-91/P-91 Reducer = 3/1 (DIC Corporation), a release varnish, was applied to the Ny#15 nylon film serving as the outer layer at a coating weight of 1.5 g/m ^. I worked on it. After the release varnish has dried, using the materials listed in Table 3, adhere the film that will become the inner layer to the release varnish coated surface with an adhesive in the same manner as Reference Examples 12 to 15 and Reference Comparative Examples 4 to 7. Then, a laminate was produced.

The film that will become the inner layer in the laminate is cut through the inner layer in the thickness direction (half-cut production process), and then the outer layer and thermoplastic adhesive resin layer are laminated on the sheet containing the inner layer to form the half-cut. A composite film having the following properties was obtained.

《Measurement of laminate strength》
The composite films obtained in Reference Examples 12 to 15 and Reference Comparative Examples 4 to 8 were cut into 15 mm widths, and the interlayer strength between the outer layer and the inner layer was measured at 25°C and 70°C. The measurement was carried out using T-shaped peeling at a rate of 300 mm/min, and the average displacement was determined over a period of 20 to 50 mm. The results are shown in Table 3.

[Preparation of pillow bag]
Using the composite films produced in Reference Examples 12 to 15 and Reference Comparative Examples 4 to 8, pillow bags with inner dimensions of 130 mm x 135 mm were produced. At this time, a microwavable container filled with 10 cc of water was sealed inside the pillow bag. Further, the half-cut was arranged at the seal portion of the pillow bag so as to cross the seal portion from the accommodation portion of the pillow bag. In addition, the conditions for producing the pillow bag were heating for 1.3 seconds and cooling for 2.0 seconds using an impulse sealer.

<Evaluation of steam permeability of pillow bags>
The produced pillow bag was heated in a microwave oven (700W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the heat-sealed part. Note that each pillow bag was microwaved five times and evaluated based on the following criteria. The results are shown in Table 3.
○: Steam was discharged in all 5 times.
×: Steam was not discharged in all 5 times.

<Reference Examples 16 to 19> Measurement of adhesive strength of heat-softening adhesive resin layer The heat-softening adhesive resin or adhesive used in Reference Examples 12 to 13 and Reference Comparative Examples 5 to 6 was replaced with Ny#15: Nylon film. (Bonyl (registered trademark) RX, Kojin Film & Chemicals Co., Ltd., thickness: 15 μm) at a coating weight of 1.5 g/m ² . Subsequently, an evaluation sample was prepared by cutting out a 25 mm wide piece and pasting it on a test plate (stainless steel plate). For pasting, a pressure roller (2 kg) was moved back and forth twice to achieve pressure bonding.

The adhesive strength of the prepared evaluation sample was measured using a strograph in an atmosphere of 25°C. The measurement was carried out under the conditions of 180° peeling and 500 mm/min, and the average displacement in the interval of 20 to 50 mm was determined. The results are shown in Table 4.

Next, the effect of the composition ratio of the base resin and the curing agent in the heat-softening adhesive resin will be explained using Reference Examples 20 to 29 and Reference Comparative Examples 9 to 15.

《Reference Examples 20 to 29 and Reference Comparative Examples 9 to 15》
In Reference Examples 20 to 29 and Reference Comparative Examples 9 to 15, the following materials were prepared for forming the layers.

(1) Base layer ・PET #12: Biaxially stretched PET film (Toyobo Ester (registered trademark) E5100, Toyobo Co., Ltd., thickness: 12 μm)
・OPP #20: Biaxially stretched PP film (Pyrene (registered trademark) P2161, Toyobo Co., Ltd., thickness: 20 μm)
・Ny#15: Nylon film (Bonyl (registered trademark) RX, Kojin Film & Chemicals Co., Ltd., thickness: 15 μm)

(2) Heat-softening adhesive resin layer TM-396 (base resin)/CAT-22B (curing agent) (Toyo Morton Co., Ltd.)
・Eritel (registered trademark) XP-1586 (Unitika Co., Ltd.)

(3) Heat seal layer ・CPP #20: Unstretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 20 μm)
・CPP #30: Unstretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 30 μm)
・E1901T #50: Laminated PP film (Differen (registered trademark) E1901T, DIC Corporation, thickness: 50 μm)

《Reference Examples 20 to 24 and Comparative Examples 9 to 14》
<Manufacture of composite film>
Using the materials listed in Table 5 or Table 6, the film that will become the base layer and the film that will become the heat seal layer are adhered with an adhesive composition that forms a heat-softening adhesive resin layer to produce a laminate. did. The coating amount of each adhesive composition was 3.0 g/m ² .

The film serving as the heat-sealing layer in the laminate is cut through the heat-sealing layer in the thickness direction (half-cut production process), and then the sheet containing the heat-sealing layer is coated with a base material layer and a heat-softening adhesive resin. The layers were laminated to obtain a composite film with half cuts.

<Measurement of laminate strength>
The composite films obtained in Reference Examples 20 to 24 and Comparative Examples 9 to 14 were cut into 15 mm widths, and the interlayer strength between the base layer and the heat seal layer was measured at 25 ° C. atmosphere and 70 ° C. atmosphere. . The measurement was carried out using T-shaped peeling at a rate of 300 mm/min, and the average displacement was determined over a period of 20 to 50 mm. The results are shown in Table 1 or Table 2. In the table, "material damage" means a situation where the laminate strength was so high that the material was destroyed during peeling and could not be measured.

<Preparation of pouch>
Using the composite films produced in Reference Examples 20 to 24 and Comparative Examples 9 to 14, pillow bags with inner dimensions of 130 mm x 135 mm were produced. At this time, a paper wiper (Kimwipe (registered trademark), manufactured by Nippon Paper Crecia) impregnated with 10 cc of water was enclosed inside the pillow bag. Further, the half-cut was placed at the seal portion of the pillow bag so as to cross the seal portion from the inside to the outside of the packaging bag. In addition, the conditions for manufacturing the pillow bag were heating for 0.9 seconds and cooling for 2.0 seconds using an impulse sealer.

<Evaluation of vapor permeability of pouch>
The prepared pouch was heated in a microwave oven (700W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the heat-sealed part. Note that each pouch was microwaved five times and evaluated based on the following criteria. The results are shown in Table 5 or Table 6.
○: Steam was discharged in all 5 times.
×: Steam was not discharged at least once.

<Evaluation of lami floating on pouch>
Five pouches were prepared in the above manner, and left to stand in an atmosphere of 25° C. for one day. After being allowed to stand still, the presence or absence of laminate lifting was visually confirmed and evaluated using the following evaluation criteria. The results are shown in Table 5 or Table 6.
○: There was no floating lamina in all 5 pouches.
△: Laminate floating was observed in 1 to 3 pouches.
×: Lami floating was observed in 4 to 5 pouches.

《Examples 25 to 29, Reference Comparative Example 15》
<Manufacture of composite film>
Using the materials listed in Table 7, a film serving as a base material layer and a film serving as a heat-sealing layer were adhered with an adhesive composition forming a heat-softening adhesive resin layer to produce a laminate. The coating amount of the adhesive composition was as shown in Table 7.

Similarly to Reference Example 20, the film serving as the heat-sealing layer in the laminate is cut through the heat-sealing layer in the thickness direction (half-cut production step), and then the sheet containing the heat-sealing layer is coated with the base material. A composite film having a half cut was obtained by laminating the layer and the heat-softening adhesive resin layer.

<Measurement of laminate strength>
In the same manner as Reference Example 20, the interlayer strength between the base material layer and the heat seal layer was measured. The results are shown in Table 7.

<Preparation of pouch>
A pillow bag with inner dimensions of 130 mm x 135 mm was produced in the same manner as Reference Example 20.

<Evaluation of pouch steam permeability and pouch laminate floating evaluation>
In the same manner as in Reference Example 20, the pouch was evaluated for steam permeability and the pouch for laminate floating. The results are shown in Table 7.

<Evaluation of adhesive leakage from half-cut>
In Examples 25 to 29 and Reference Comparative Example 15, each raw material of the composite film was produced in a 4000 m roll, taken out after aging, and immediately re-wound. At the time of rewinding, it was checked whether any leaked adhesive adhered to the roll, etc., and the roll was evaluated using the following evaluation criteria. The results are shown in Table 7.
○: No leakage of adhesive was observed.
△: Slight leakage (no problem with processing)
×: Adhesive leakage was observed.

100 Standing pouch 11 Front sheet 12 Upper seal part 13 Side seal part 13a Wide side seal part 14 Storage part 15 Notch 16 Convex seal part 17 Steam 10 Composite film 1 Outer layer 2 Adhesive layer 3 Inner layer H Half cut F Folding line

Claims (9)

A standing pouch in which a front sheet, a back sheet, and a bottom sheet are heat-sealed at least at a top seal portion and a side seal portion to form a storage portion for accommodating contents,
At least one of the front sheet and the back sheet is made of a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order, and the front sheet and the back sheet facing each other are made of a composite film in which at least an outer layer, an adhesive layer, and an inner layer are laminated in this order. the sheet is heat-sealed to form the upper seal portion and the side seal portion;
The composite film includes a half cut made from the side of the inner layer and reaching the adhesive layer,
The half cut is arranged so as to cross the side seal part from the accommodating part side of the standing pouch to the outer peripheral part side of the standing pouch,
A part of the side seal part constitutes a wide side seal part that is wider than other parts of the side seal part in a part where the half cut does not exist.
standing pouch. The standing pouch of claim 1, wherein the wide side seals are present on both side seals. The standing pouch according to claim 1 or 2, wherein the wide side seal portion is in contact with the bottom sheet. The side seal portion and/or the top seal portion have at least one type selected from the group consisting of an unsealed portion where the front sheet and the back sheet are not heat-sealed, a notch, and a notch,
The unsealed portion, the notch, and/or the notch protrude toward the accommodating portion of the standing pouch from a side edge and/or an upper edge of the standing pouch,
The half cut is arranged so as to cross the unsealed part, the notch, and/or the notch from the accommodating part side of the standing pouch to reach the outer peripheral side of the standing pouch.
The standing pouch according to claim 1 or 2. The side seal part and/or the top seal part includes a convex seal part that protrudes toward the accommodating part side of the standing pouch,
The half cut is arranged from the accommodating part side of the standing pouch to cross the convex seal part and reach the outer peripheral part side of the standing pouch.
The standing pouch according to claim 1 or 2. The standing pouch according to claim 1 or 2, wherein the front sheet, the back sheet, and the bottom sheet are heat-sealed at least at the bottom seal portion and the side seal portion. The adhesive layer is a thermosoftening resin,
The lamination strength at 25° C. between the outer layer and the inner layer is 1.5 N/15 mm or more,
The lamination strength at 70° C. between the outer layer and the inner layer is less than 1.5 N/15 mm,
The laminate strength is measured by T-peeling in accordance with JIS K6854-3:1999 at a rate of 300 mm/min and by calculating the average displacement in a range of 20 to 50 mm.
The standing pouch according to claim 1 or 2. The standing pouch according to claim 1 or 2, wherein the adhesive layer has an adhesive strength of 1.0 N/25 mm or more according to JIS Z0237. The standing pouch according to claim 1 or 2, which is for use in a microwave oven.

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