JP2023069430A - standing pouch - Google Patents

Abstract

To provide a standing pouch capable of discharging water vapor generated from a content due to heating from an intended position of a side seal part and/or an upper seal part of the pouch.SOLUTION: A standing pouch has at least one selected from the group consisting of an unsealed part where a sealant layer is not heat-sealed, an incision and a notch which project from a side edge and/or an upper edge of the standing pouch toward a storing part side of the standing pouch, at a side seal part and/or an upper seal part of the standing pouch. The standing pouch also has a half-cut part which is cut from the side of the sealant layer so as to reach the unsealed part, the incision and/or the notch from the storing part side of the standing pouch.SELECTED DRAWING: Figure 1

Description

The present invention relates to standing pouches. More particularly, it relates to a standing pouch capable of expelling steam generated from the contents by heating from intended positions of the side seals and/or top seals of the pouch.

Conventionally, microwave pouches are known that allow steam to be vented from an intended location.

For example, Patent Literature 1 proposes a standing pouch equipped with an automatic steam venting mechanism capable of discharging steam generated from contents to the outside during cooking with a microwave oven. In Patent Document 1, at least one side end of a standing pouch body is provided with an overhanging seal portion that is bent and overhangs toward the inner side of the pouch. Removal is possible.

Patent Document 2 proposes, as a pouch packaging material, a laminate in which a substrate layer, a thermosoftening layer, and a sealant layer are laminated in this order. Then, when the laminate is half-cut from the sealant layer side and cooked in a microwave oven, steam is allowed to pass through the half-cut at the heat-sealed portion where the sealant layers are heat-sealed to each other, so that the steam is released from the pouch. It is said to be removed.

Japanese Patent Application Laid-Open No. 2020-200048 JP 2017-124859 A

However, in the standing pouch described in Patent Document 1, in order to function the automatic steam venting mechanism, the seal strength of the overhanging seal portion is made weaker than the seal strength of the side end portion, or the seal width of the overhanging seal portion is reduced. I had to make it thinner. For this reason, not only the manufacturing process of the standing pouch is complicated, but also the strength of the resulting standing pouch may be problematic.

Moreover, the packaging material described in Patent Document 2 has an adhesive layer between the base material layer and the sealant layer in addition to the thermosoftening resin layer. The thermosoftening resin layer is scattered and embedded in the adhesive layer, and is arranged 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 produced from the packaging material described in Patent Document 2, it is difficult to release steam from the intended position due to the shape of the space for storing the contents of the standing pouch. It can be a situation.

Specifically, since the standing pouch is generally formed by folding and sealing the lower part of the pouch, it has a structure in which the space in the lower part of the pouch is wide and the space in the upper part of the pouch is narrow. Then, the peeling force due to the pressure of steam generated by heating is most greatly applied to the upper end seal portion of the pouch, which is a narrower space. Therefore, even if a vapor venting mechanism is provided in the body of the pouch, it is difficult to function the vapor venting mechanism due to the existence of the peeling force difference. The bag may break.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and is a standing device capable of discharging water vapor generated from contents by heating from intended positions of the side seal portion and/or the top seal portion of the pouch. Intended to provide pouches.

The present inventors have made intensive studies to solve the above problems. Then, the sealant layer, which is not heat-sealed and protrudes toward the storage portion side of the standing pouch from the side edge and/or the upper edge of the standing pouch, is not heat-sealed. At least one selected from the group consisting of a sealed portion, a cut, and a notch is provided, and from the storage portion side of the standing pouch, the sealant layer side so as to traverse the unsealed portion, the cut, and / or the notch The present inventors have completed the present invention by discovering that by arranging the half-cut made from the pouch, steam can be discharged from the intended position of the side seal portion and/or the top seal portion of the pouch. That is, the present invention is as follows.

<<Aspect 1>>
A standing pouch comprising a front sheet, a back sheet, and a bottom sheet heat-sealed at least at the top and side seals to form a container for containing the contents,
At least one of the front sheet and the back sheet is made of a composite film in which at least a base layer, an adhesive layer, and a sealant layer are laminated in this order, and the front surfaces facing each other via the sealant layer the sheet and the back sheet are heat-sealed to form the top seal portion and the side seal portion;
The side seal portion and/or the top seal portion have at least one 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 from the side edge and/or the upper edge of the standing pouch toward the storage portion side of the standing pouch,
The composite film is provided with a half cut applied from the sealant layer side and reaching the adhesive layer,
The half-cut is arranged to reach the unsealed portion, the notch, and/or the notch from the storage portion side of the standing pouch,
standing pouch.
<<Aspect 2>>
The side seal portion and/or the upper seal portion are convex seal portions protruding toward the storage portion side of the standing pouch on the storage portion side of the unsealed portion, the notch, and/or the notch. with
The half-cut is arranged to reach the unsealed portion, the notch, and/or the notch by crossing the convex seal portion from the storage portion side of the standing pouch,
A standing pouch according to aspect 1.
<<Aspect 3>>
The standing pouch according to aspect 2, which satisfies the following formula (1):
a+bc<10mm (1)
(a: the side seal portion and/or the top seal having the unsealed portion, the notch, and/or the notch normal to the side edge and/or top edge of the standing pouch; part width,
b: the width of the convex seal portion normal to the side edge and/or the top edge of the standing pouch;
c: the width of the unsealed portion, the notch and/or the notch normal to the side and/or top edge of the standing pouch).
<<Aspect 4>>
The adhesive layer is a thermosoftening resin,
The laminate strength at 25° C. between the base layer and the sealant layer is 1.5 N/15 mm or more,
The laminate strength at 70° C. between the base layer and the sealant layer is less than 1.5 N/15 mm.
The standing pouch according to any one of aspects 1-3.
<<Aspect 5>>
The standing pouch according to any one of aspects 1 to 4, wherein the adhesive layer has an adhesive strength of 1.0 N/25 mm or more according to JIS Z0237.
<<Aspect 6>>
The standing pouch according to any one of aspects 1 to 5, which is for microwave ovens.

According to the standing pouch of the present invention, the water vapor generated from the contents by heating can be discharged from the intended positions of the side seal portions and/or the top seal portion of the pouch.

In addition, when only one adhesive layer is arranged between the base material layer and the sealant layer, the manufacturing process of the composite film can be simplified, and as a result, the production capacity of the standing pouch is increased. Can contribute to production costs.

1 is a front view of a standing pouch according to one embodiment of the present invention; FIG. 1 is a cross-sectional view of a composite film that constitutes a standing pouch according to one embodiment of the present invention; FIG. FIG. 4 is a schematic view of the composite film used for the standing pouch according to one embodiment of the present invention when steam is vented. 1 is a front view of a standing pouch of Example 1. FIG. 2 is a front view of a standing pouch of Example 2. FIG. FIG. 10 is a front view of a standing pouch of Example 3; FIG. 10 is a front view of a standing pouch of Example 4; 11 is a front view of a standing pouch of Example 5. FIG. 11 is a front view of a standing pouch of Example 6. FIG. FIG. 11 is a front view of a standing pouch of Example 7; FIG. 11 is a front view of a standing pouch of Example 8; FIG. 11 is a front view of a standing pouch of Example 9; FIG. 11 is a front view of a standing pouch of Example 10; FIG. 11 is a front view of a standing pouch of Example 11; 4 is a front view of a standing pouch of Comparative Example 1. FIG. 10 is a front view of a standing pouch of Comparative Example 2. FIG. 10 is a front view of a standing pouch of Comparative Example 3. FIG.

《Standing Pouch》
The standing pouch of the present invention is 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 container for containing contents. hand,
At least one of the front sheet and the back sheet is made of a composite film in which at least a substrate layer, an adhesive layer, and a sealant layer are laminated in this order, and the front sheet and the back sheet face each other with the sealant layer interposed therebetween. are heat sealed to form a top seal and a side seal,
The side seal portions and/or the top seal portion have at least one 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 from the side edge and/or the upper edge of the standing pouch toward the storage portion side of the standing pouch,
The composite film has a half cut applied from the sealant layer side and reaching the adhesive layer,
The half-cuts are arranged to reach the unsealed part, the notch and/or the notch from the containing part side of the standing pouch.

According to such a standing pouch of the present invention, the half-cut is arranged so as to reach the unsealed portion, the notch, and/or the notch from the storage portion side of the standing pouch, so that the contents can be heated. It is possible to allow the water vapor generated from the article to escape from the intended locations of the side seals and/or top seals of the pouch, ie unsealed portions, notches and/or notches.

Although it is not limited to theory, this is because, on the side seal portion and/or the housing portion side of the top seal portion, where the peeling force due to the pressure of the steam is likely to be applied, the steam moves from the half-cut to the thickness direction of the composite film. It penetrates and causes delamination between the adhesive layer and the sealant layer to form a space for steam venting, and on the other hand, the side seal portion and/or the top seal portion to which the peeling force due to the pressure of water vapor is less likely to be applied. This is believed to be due to vapor venting through pre-formed unsealed portions, notches and/or notches on the side edge side and/or the upper edge side of the .

As described above, in the standing pouch of the present invention, the front sheet, back sheet, and bottom sheet are heat-sealed at least at the top and side seals to form a container for containing the contents. have a structure.

At least one of the front sheet and the back sheet is made of a composite film in which at least a substrate layer, an adhesive layer, and a sealant layer are laminated in this order, and the front sheet and the back sheet facing each other through the sealant layer. It is heat sealed to the backsheet to form a top seal and a side seal.

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

The standing pouch 100 shown in FIG. 1 has a front sheet 11, a back sheet, and a bottom sheet formed of one continuous composite film. Specifically, at least one composite film comprising a base material layer, an adhesive layer, and a sealant layer is used, and the two bottom portions of the standing pouch are mountain-folded so that the sealant layer is on the inside. Then, by valley-folding along the fold-back line indicated by F in FIG. 1, the area to be the bottom sheet is folded, and the area to be the front sheet 11 and the area to be the back sheet are formed. After that, both sides of the area to be the front sheet 11, both sides of the folded bottom sheet, and both sides of the area to be the back sheet are overlapped and heat-sealed to form the body of the standing pouch 100. Side sealing portions 13 are formed on both sides.

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

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 a base layer, an adhesive layer, and a sealant 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 sealant layer of the composite film to form the top seal portion and the side seal portion. .

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

<Unsealed portion, notch and/or notch>
The standing pouch of the present invention has at least one member selected from the group consisting of an unsealed portion where the front sheet and the back sheet are not heat-sealed, cuts, and cutouts in the side sealed portions and/or the top sealed portion. have. The unsealed portion, the notch, and/or the notch are the side edges of the standing pouch (the outer edge of the standing pouch at the side seal portion) and/or the top edge (the outer edge of the standing pouch at the top seal portion). is formed so as to protrude toward the accommodating portion side of the standing pouch.

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 adhered.

Although the method for producing the unsealed portion is not particularly limited, for example, when forming the side seal portion and/or the upper seal portion, a region to which heat is not applied is provided in the seal region. can be made with Alternatively, after heat-sealing the front sheet and the back sheet to form the side seal portion and/or the top seal portion, the side seal portion and/or the top seal portion are partly peeled off to produce the be able to.

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 at the side seal) and/or the top edge (the outer edge of the standing pouch at the top seal). A linear cut starting at , which may be a straight or curved cut.

The method for making the cut is not particularly limited, but for example, after forming the side seal portion and/or the top seal portion, the side edge of the standing pouch (the outer edge of the standing pouch of the side seal portion ) and/or from the top edge (outer end of the standing pouch at the top seal), through the side seal and/or top seal toward the receiving portion of the standing pouch, a cutter, knife, scissors It can be produced by cutting using a cutting tool such as. Alternatively, cuts are made in both sides and/or top of both the front sheet and the back sheet, and the positions of the cuts are aligned and the front sheet and the back sheet are heat-sealed to form a side portion having the cuts. A seal and/or a top seal may be made. In addition, cuts may be made on the side and/or top of at least the sheet made of the composite film of the front sheet and the back sheet to form side seal portions and/or top seal portions having 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 at the side seal) and/or the top edge (the outer edge of the standing pouch at the top seal). ) and has a certain amount of area.

The shape of the notch is not particularly limited. It may be of various shapes such as triangles, squares, polygons, and semicircles.

The method for making the notch is not particularly limited. part) and/or the upper edge (the outer edge of the standing pouch of the upper seal part) is the bottom, cut inside the side seal part and/or the upper seal part using a cutting tool such as a knife or scissors It can be manufactured by cutting out a desired shape. Alternatively, cutouts of the desired shape are made on the sides and/or top of the front and back sheets, respectively, so that the side edges (outer edges of the sheet) and/or the top edges (outer edges of the sheet) are the bases. and heat-sealing the front sheet and the back sheet with the cutouts aligned to form side seal portions and/or top seal portions having cutouts. In addition, cutouts are formed in the side and/or top portions of at least the composite film of the front sheet and the back sheet to form side seal portions and/or top seal portions having cutouts. may

The standing pouch 100 shown in FIG. 1 has a single notch 15 in the shape of a triangle in the side seal 13 . The notch 15 is formed so as to protrude from the side edge of the standing pouch 100 (the side end of the side seal portion 13) toward the storage portion 14 of the standing pouch. Specifically, the side edge of the standing pouch 100 (the outer end of the standing pouch 100 of the side seal portion 13) is the bottom side, and the side seal portion is so that the apex projects toward the storage portion 14 side of the standing pouch 100. A triangular notch 15 is obtained by notching 13 .

In the standing pouch 100 shown in FIG. 1, steam 17 is discharged from the notch 15 by heating with a microwave oven or the like.

<Half cut>
The composite film used in the present invention comprises a half cut applied from the sealant layer side and reaching the adhesive layer. Therefore, the standing pouch of the present invention, which is produced by using the composite film as at least one of the front sheet and the back sheet, is provided with half cuts that are applied from the sealant layer side of the composite film and reach the adhesive layer. ing.

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

The half-cuts in the standing pouch of the present invention are arranged so as to reach the unsealed portions, cuts and/or notches described above. Then, when heating with a microwave oven or the like, steam can be released from the unsealed part, the cut, and / or the notch where the half cut reaches, and the intention of the side seal part and / or the top seal part By arranging these at the designated positions, it is possible to perform steam venting from the intended positions.

The standing pouch of the present invention uses a half-cut composite film for at least one of the front sheet and the back sheet, and the sealant layer of the composite film is heat-sealed to the opposing front sheet and back sheet. Thus, the sealant layer becomes the inner side of the standing pouch, ie, the layer that contacts the contents. Therefore, steam generated from the contents by heating enters the composite film in the thickness direction through the half-cut.

Therefore, the standing pouch of the present invention is provided with the above-described unsealed portions, cuts and/or notches, and half-cuts arranged to reach these locations where steam venting is required. This makes it possible to perform steam venting from an intended position.

FIG. 2 shows a cross-sectional view of one embodiment of the composite film used in the present invention. The composite film 10 shown in FIG. 2 includes a base layer 1, an adhesive layer 2 laminated inside the base layer 1, and a sealant 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 sealant layer 3 side and reaches the surface of the adhesive layer 2 .

In addition, the depth of the half cut may be up to the surface of the adhesive layer, or may be applied to the inside of the adhesive layer, or may penetrate the adhesive layer. .

However, it is preferable that the half cut has a depth that does not reach the substrate layer that is the outermost layer of the composite film. When the half-cut reaches the base material layer, the strength of the standing pouch formed from the composite film may decrease.

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

The half-cut shape may be either a continuous line or an intermittent line. Moreover, at least one line may be applied, and the number is not limited. When providing a plurality of half-cuts, it is preferable that the half-cuts are substantially parallel to each other. In addition, when a plurality of half-cuts are provided, it is not necessary for all half-cuts to reach the unsealed portion, the notch, and/or the notch, and at least one half-cut must be the unsealed portion, the notch. , and/or reach the notch.

Also, the length of the half cut is not particularly limited. The length may be such that it is provided only at the portion where the steam is to be removed, 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 examples thereof include a method of forming a composite film and then using a laser or the like.

Alternatively, the composite film used in the present invention may be formed by forming half-cuts during production of the composite film and laminating the layer having the half-cuts and other layers. In this case, for example, the sheet containing the sealant layer is cut using a rotary die cutter to penetrate the sealant layer in the thickness direction (half-cut production step), and then the sheet containing the sealant layer is coated with the base material. A method of laminating layers and adhesive layers (lamination process) can be mentioned.

<Convex seal part>
In the standing pouch of the present invention, the side seal portion and/or the upper seal portion protrude toward the storage portion side of the standing pouch on the storage portion side of the unsealed portion, the cut, and/or the notch described above. A convex seal portion may be provided.

If a convex seal is provided, the half-cuts traverse the convex seal from the housing side of the standing pouch to the side edges so as to reach the unsealed portion, the notch, and/or the notch. are placed.

The convex seal portion is a seal portion formed by heat-sealing the sealant layer of the composite film with the facing front sheet and back sheet.

The standing pouch 100 shown in FIG. 1 is attached to the side seal portion 13 so as to protrude from the side edge of the standing pouch 100 (side end portion of the side seal portion 13) toward the storage portion 14 side of the standing pouch. It has one notch 15 of triangular shape formed. A triangular convex seal portion 16 protruding toward the accommodating portion 14 side of the standing pouch 100 is provided on the notch 15 on the accommodating portion 14 side.

The base of the triangular convex seal portion 16 is the side edge of the storage portion 14 of the standing pouch 100 (the end of the side seal portion 13 on the storage portion 14 side), and the vertex protrudes inside the storage portion 14 of the standing pouch 100. It is formed so that

The half cut H is arranged so as to pass through the triangular vertex of the convex seal portion 16 , traverse 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 portion, the vapor generated from the contents exerts a greater pressure on the convex seal portion than other portions, so that the vapor can be more easily vented from the intended position. can be implemented.

The shape of the convex seal portion is not particularly limited. It may be of various shapes such as triangles, squares, polygons, and semicircles. Among them, triangles, quadrilaterals, and polygons having corners are preferable, and triangles are more preferable, from the viewpoint of being able to utilize stress concentration due to steam pressure.

<Relationship between Side Seal Portion and/or Top Seal Portion, Convex Seal Portion, Unsealed Portion, Notch and/or Notch>
In the standing pouch of the present invention, the side seal portion and/or the top seal portion, the convex seal portion, the unsealed portion, the cut and/or the notch may satisfy the relationship of the following formula (1).
a+bc<10mm (1)
(a: the width of the side seal and/or top seal, with unsealed portions, notches, and/or notches, normal to the side and/or top edges of the standing pouch;
b: the width in the direction normal to the side edge and/or the upper edge of the standing pouch of the convex seal portion;
c: the width normal to the side and/or top edge of the standing pouch of the unsealed portion, cut, and/or notch)

When the standing pouch of the present invention satisfies the relationship of the above formula (1), it is possible to vent steam from the intended position more reliably.

The standing pouch may satisfy the relationship of formula (2) below, or may satisfy the relationship of formula (3) below.
a+bc<8mm (2)
a+bc<6mm (3)
(In formulas (2) and (3), a, b, and c are the same as in formula (1) above.)

《Composite film》
The composite film used in the standing pouch of the present invention is a composite film in which at least a substrate layer, an adhesive layer and a sealant layer are laminated in this order. Then, as described above, the half cut is applied from the sealant layer side and reaches the adhesive layer.

FIG. 2 shows a cross-sectional view of one embodiment of the composite film used in the present invention. The composite film 10 shown in FIG. 2 includes a base layer 1, an adhesive layer 2 laminated inside the base layer 1, and a sealant 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 sealant layer 3 side and reaches the surface of the adhesive layer 2 .

The composite film used in the present invention includes a substrate layer, an adhesive layer, and a sealant layer as essential components, and these layers may be laminated in this order. In the present invention, any layer may be provided in addition to the substrate layer, the adhesive layer, and the sealant layer. Examples of the optional layer include a barrier layer for imparting barrier properties and a A reinforcing layer for bonding, or an adhesive layer for bonding between layers.

Arrangement of any layer is not particularly limited, and for example, it may exist between the substrate layer, the adhesive layer, and the sealant layer, or outside the laminate containing these layers.

In addition, when a layer other than an adhesive layer is not arranged between the base material layer and the sealant layer, the manufacturing process of the composite film can be simplified, which reduces production capacity and production costs. can contribute.

The thickness and the like of each layer constituting the composite film used in the present invention can be appropriately determined according to the use of the standing pouch to be formed.

<Base material layer>
The base material layer is an essential constituent layer in the composite film used for the standing pouch of the present invention.

Since the composite film used for the standing pouch of the present invention has a substrate layer, an adhesive layer, and a sealant layer laminated in this order, the substrate layer is the outer layer of the standing pouch. Therefore, the base material layer can serve as a protective layer when the sealant layer, which is the innermost layer, is heat-sealed to form a standing pouch. In addition, it can also be a printing layer for printing for displaying contents and the like.

The material constituting the base material layer is not particularly limited as long as it is a resin or the like, particularly a resin or the like that can be used as a protective layer and can be printed. Commonly used resins can be used, for example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyethylene (PE), polypropylene (PP) , polyolefins such as polystyrene (PS), polyamides (PA) such as nylon-6 and nylon-66, and polycarbonates (PC).

The resin or the like constituting the base material layer may be blended not only in one kind but also in a blend of two or more kinds, and if necessary, an additive or the like for imparting functionality etc. may be blended. .

It should be noted that the base material layer is preferably made from a preformed film. The film that serves as the substrate layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among them, a biaxially stretched film is preferred.

In addition, metal such as aluminum, or oxide such as silicon oxide or aluminum oxide may be vapor-deposited on the film serving as the substrate layer.

Further, the film that serves as the base layer may be a single layer or may be a laminate composed of multiple layers.

<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 base layer and the sealant layer.

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

The material of 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 thermosoftening resin that provides a specific lamination strength. Specifically, the adhesive layer has a lamination strength of 1.5 N/15 mm or more between the base layer and the sealant layer at 25°C, and a lamination strength between the base layer and the sealant layer at 70°C. is less than 1.5 N/15 mm.

If the lamination strength between the base material layer and the sealant layer at 25°C is 1.5 N/15 mm or more, the standing pouch formed from the composite film has sufficient strength at around room temperature and is easy to store and handle. In this case, peeling or the like does not occur between the base layer and the sealant layer.

The laminate strength at 25° C. between the base material layer and the sealant 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/ It may be 15 mm or more.

On the other hand, the laminate strength at 25° C. between the base material layer and the sealant layer was 6.0 N/15 mm or less, 5.0 N/15 mm or less, 4.5 N/15 mm or less, 4.0 N/15 mm or less, and 3.0 N/15 mm or less. It may be 5N/15mm or less, or 3.0N/15mm or less.

Further, if the laminate strength at 70° C. between the base material layer and the sealant layer is less than 1.5 N/15 mm, when the standing pouch formed from the composite film is heated, the thermosoftening adhesive resin layer It becomes easy to form a space in the inside, and by moving the steam through the space, it is possible to exhibit the same steam venting performance as the conventional one.

The laminate strength at 70° C. between the base material layer and the sealant 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. 0.1/15 mm or less, or 0.05 N/15 mm or less.

On the other hand, the laminate strength at 70° C. between the base material layer and the sealant layer was 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, 0.2 N/15 mm or more, It may be 3 N/15 mm or more, 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 base material layer and the sealant layer at 25°C is greater than the lamination strength at 70°C. It's becoming That is, when a standing pouch formed from a composite film is heated in a microwave oven or the like, the laminate strength between the base material layer and the sealant layer decreases due to the temperature rise. It becomes easy to form a space in the layer. Vapor generated from the contents can then be moved through the formed space.

Further, when the adhesive layer of the composite film used in the standing pouch of the present invention has the above lamination strength, only one adhesive layer made of a thermosoftening resin is provided between the base material layer and the sealant layer. Even with the arranged configuration, it is possible to realize a standing pouch having steam release performance equivalent to that of the conventional one.

Examples of commercially available materials that can achieve the above lamination strength include LX-500 (DIC Corporation), Elitel (registered trademark) XP-1648-45EA (Unitika Ltd.), TM-396 (Toyo-Morton Co., Ltd.) company), etc.

(adhesive strength)
The adhesive layer of the composite film used for 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 adhesiveness with the adjacent layer, so when storing and handling the standing pouch formed from the composite film , problems such as peeling can be avoided.

In addition, since there is no need to provide a layer for strengthening adhesion between the base material layer and the sealant layer, the manufacturing process of the composite film can be simplified, contributing to production capacity and production costs. can do.

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 5.0/25mm or less, or 4.0N/25mm or less.

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

The sealant layer becomes the layer that is heat-sealed when forming the standing pouch. Therefore, the sealant layer is arranged so as 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 impart sufficient sealing strength to the molded standing pouch. Known materials can be applied, for example low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polypropylene (PP), ethylene- Propylene copolymer (EP), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ionomer resin, ethylene-vinyl acetate copolymer (EVA) and the like.

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

The sealant layer may be formed using a film preformed from the above materials, or may be formed by applying a sealant layer to the surface of the laminate in which the substrate layer, the adhesive layer, and, if necessary, other layers are laminated. may be formed by melting, extruding, and cooling to solidify.

In addition, the resin or the like constituting the sealant layer may be blended not only in one type but also in a blend of two or more types. good.

Furthermore, the sealant layer may be a single layer or may be composed of multiple layers.

<Other layers>
The composite film used in the standing pouch of the present invention may contain layers other than the base material layer, the adhesive layer, and the sealant layer as essential constituent layers.

Other layers are not particularly limited. For example, a barrier layer for imparting barrier properties, a reinforcing layer for reinforcing strength, or an adhesive for bonding between layers layers and the like.

As a barrier layer for imparting barrier properties, for example, ethylene-vinyl alcohol copolymer (EVOH), nylon (NY), and polyvinylidene chloride (PVDC) exhibiting a function of blocking gases such as oxygen and water vapor. , or a layer made of polyacrylonitrile (PAN).

Materials for the reinforcing layer for reinforcing strength include, for example, paper, synthetic paper, non-woven fabric, and the like. They 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 material layer as a reinforcing layer separately from the base material layer.

Examples of adhesive layers 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 for dry lamination or hot melt lamination of layers.

The resins and the like constituting the other layers may be blended not only in one kind but also in two or more kinds. In addition, additives and the like for imparting functionality and the like may be blended as necessary.

<<Action of Standing Pouch>>
The action of the standing pouch of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a standing pouch formed using the composite film described above as the front sheet, and FIG. 2 is a cross-sectional view of the composite film used as the front sheet. Also, FIG. 3 is a schematic view of the composite film used for the standing pouch being vented.

The composite film 10, which serves as the front sheet 11 of the standing pouch 100 shown in FIG. 1, is a laminate composed of the base material layer 1, the adhesive layer 2, and the sealant layer 3 shown in FIG. As shown in FIG. 1, the composite film 10 to be the front sheet 11 has each layer extending in the XY plane formed in the X direction and the Y direction, and the composite film 10 in the Z direction (not shown). thickness direction. That is, FIG. 1 is a front view of the standing pouch 100 seen from the base material layer 1 side.

In composite film 10 constituting standing pouch 100 shown in FIG. It is arranged to traverse the portion 16 and reach the notch 15 of the side seal portion 13 .

When such a standing pouch 100 is heated and vapor is generated from the contents filled in the containing portion 14 of the standing pouch 100, as shown in FIG. It is discharged to the outside of the standing pouch 100 from the notch 15 of 13.

Here, the effect of discharging the steam 17 to the outside of the standing pouch 100 from the notch 15 of the side seal portion 13 will be described with reference to FIG.

FIG. 3 shows a cross-sectional view in the Z direction (not shown) of the composite film 10, which is the front sheet 11 of the standing pouch 100, where the standing pouch 100 is heated and the contents of the standing pouch 100 are removed. The steam 17 is shown softening the adhesive layer 2 of the composite film 10 when the steam 17 is generated.

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

The pressure inside the standing pouch 100 increases and rises 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 sealant layer 3 due to the increase in internal pressure, and the adhesive layer 2 is lifted to the outside of the standing pouch 100 by the pressure of the steam 17 . , a space 6 is formed in the peeled portion.

The steam 17 generated from the contents moves to the side seal portion 13 through the space 6 developed in the area of the half cut H arranged so as to traverse the convex seal portion 16, and moves to the side seal portion 13. When reaching the notch 15 , it is discharged from the notch 15 to the outside of the standing pouch 100 .

<<Use of standing pouch>>
Applications of the standing pouch of the present invention are not particularly limited. Contents that can be filled include gels, gels, and liquids including pastes. Examples of liquid substances include pharmaceuticals, quasi-drugs, cosmetics, detergents, foods, and paints.

Examples of pharmaceuticals and quasi-drugs include injections, infusions, infusions, infusions, decoctions, and the like. Cosmetics include, for example, shampoos, conditioners, hair styling agents (eg, hair waters, hair liquids, greases, etc.). Detergents include, for example, neutral detergents, alkaline detergents, and acid detergents. Examples of foods include beverages, edible oils, soups, creams, and liquid seasonings (eg, soy sauce, vinegar, mentsuyu, warishita, mirin, Worcestershire sauce, dressings, ketchup, tabasco, sweeteners, etc.). Paints include, for example, paints, varnishes, oil stains, and the like.

In addition, gel-like, gel-like, or paste-like contents may be used, and examples thereof include toothpaste, wasabi, jelly, jam, miso, and the like.

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

EXAMPLES The present invention will be described in more detail below with reference to Examples, Comparative Examples, etc., but the present invention is not limited to these.

<Examples 1 to 11, Comparative Examples 1 to 3>
In Examples 1 to 11 and Comparative Examples 1 to 3, standing pouches were prepared as variations of the standing pouch shown in FIG. .

[material]
Materials for the standing pouches produced in Examples 1 to 11 and Comparative Examples 1 to 3 are shown below.

(1) Base layer OPP: biaxially stretched PP film (Pyrene (registered trademark) P2161, Toyobo Co., Ltd., thickness: 20 μm)

(2) Thermosoftening resin layer TM-396/CAT-22B (Toyo-Morton Co., Ltd.)

(3) Sealant layer CPP: unstretched PP film (Pyrene (registered trademark) P1128, Toyobo Co., Ltd., thickness: 50 μm)

(4) PET film layer PET: PET film (Ester (registered trademark) film E5100, Toyobo Co., Ltd., thickness: 12 μm)

(5) Adhesive LX-500/KR-90S (DIC Corporation)

[Production of composite film]
A PET film and a CPP film serving as a sealant layer were bonded together with an adhesive to prepare a sealant laminate. Subsequently, the sealant laminate was cut linearly and intermittently so as to penetrate in the thickness direction (half-cut manufacturing step).

An OPP film serving as a base layer was adhered to the PET film side of the sealant laminate having cuts with a thermosoftening adhesive resin to prepare a laminate to be a composite film. The coating amount of the thermosoftening adhesive resin was 2.0 g/m ² .

<<Example 1>>
[Production of standing pouch]
The heat-sealed layers of the produced composite film were opposed to each other to produce a standing pouch having outer dimensions of 140 mm in width, 140 mm in height, and 30 mm in folding width, as shown in FIG. At this time, the inside of the standing pouch was filled with Kimwipe (registered trademark) L-100 (470 mm×425 mm) and 20 g of water.

Half cuts were placed from one side seal of the standing pouch, across the container, to the other side seal, across both side seals and container. The standing pouch was produced under the conditions of heating for 1.0 seconds and cooling for 2.0 seconds using an impulse sealer.

(Preparation of side seal portion)
In Example 1, a standing pouch shown in FIG. 4 was produced. Specifically, the side seal portion was produced so that the width (a) in the direction normal to the side edge of the standing pouch was 5 mm.

(Preparation of convex seal portion)
Subsequently, two triangular convex seals are provided on both side seals on the half-cut extension line so that the end of the standing pouch on the storage part side becomes the base and the apex protrudes inside the storage part. formed. At this time, the half-cut was arranged so as to pass through the vertex of the triangle, and the convex seal part was made to have a width (b) of 5 mm in the direction normal to the side edge of the standing pouch.

(Creation of notch)
Subsequently, two equilateral triangular cutouts are made in both side seal portions on the extension of the half cut so that the outer end of the standing pouch of the side seal portion becomes the base and the apex protrudes toward the containing portion. made. The width (c) of the notch normal to the side edge of the standing pouch was 5 mm.

(a+bc)
Therefore, the value of the following formula (1) in Example 1 is 5 mm.
a+bc (1)
(a: the width of the notched side seal normal to the side edge of the standing pouch,
b: the width of the convex seal portion normal to the side edge of the standing pouch,
c: the width of the notch normal to the side edge of the standing pouch)

<<Example 2>>
As shown in FIG. 5, a standing pouch was produced in the same manner as in Example 1, except that the half-cut was changed so that it passed through substantially the center of the upper side of the equilateral triangle that serves as the convex seal portion.

<<Example 3>>
As shown in FIG. 6, a standing pouch was produced in the same manner as in Example 1, except that the half-cut was changed so that it passed through substantially the center of the lower side of the equilateral triangle that serves as the convex seal portion.

<<Example 4>>
As shown in FIG. 7, a standing pouch was produced in the same manner as in 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.

<<Example 5>>
As shown in FIG. 8, a standing pouch was produced in the same manner as in 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.

<<Example 6>>
As shown in FIG. 9, except that the shape of the convex seal portion was an acute triangle and the width (b) of the convex seal portion in the direction normal to the side edge of the standing pouch was changed to 7 mm. A standing pouch was produced in the same manner as in 1. In this example, the value (a+b−c) in equation (1) is 7 mm.

<<Example 7>>
As shown in FIG. 10, a standing pouch was produced in the same manner as in Example 1, except that a convex seal portion and a notch were formed only on one side of the side seal portion.

<<Example 8>>
As shown in FIG. 11, a standing pouch was produced in the same manner as in Example 1, except that the shape of the convex seal portion was a quadrangle, and the half cut was arranged so as to pass through approximately the center of the quadrangle.

<<Example 9>>
As shown in FIG. 12, a standing pouch was produced in the same manner as in 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.

<<Example 10>>
As shown in FIG. 13, a standing pouch was prepared in the same manner as in Example 1, except that the width (a) of the side seal portion in the direction normal to the side edge of the standing pouch was 10 mm, and the convex seal portion was not produced. was made. In this example, the width (b) of the convex seal portion in the direction normal to the side edge of the standing pouch is 0 mm, so the value (a+bc) in formula (1) is 5 mm.

<<Example 11>>
[Production of standing pouch]
The heat-sealed layers of the produced composite film were opposed to each other to produce a standing pouch having outer dimensions of 140 mm in width, 140 mm in height, and 30 mm in width when folded, as shown in FIG. At this time, the inside of the standing pouch was filled with Kimwipe (registered trademark) L-100 (470 mm×425 mm) and 20 g of water.

The half cut was placed from the top seal of the standing pouch, across the container, to the bottom seal of the standing pouch, across both seals and the container. The standing pouch was produced under the conditions of heating for 1.0 seconds and cooling for 2.0 seconds using an impulse sealer.

(Fabrication of upper seal portion)
In Example 11, a standing pouch shown in FIG. 14 was produced. Specifically, the upper seal portion was produced so that the width (a) in the direction normal to the upper edge of the standing pouch was 5 mm.

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

(Creation of notch)
Subsequently, an equilateral triangular notch was formed in the upper seal part on the extension of the half cut so that the outer end of the standing pouch of the upper seal part was the base and the vertex projected toward the housing part. The width (c) of the notch normal to the upper edge of the standing pouch was 5 mm.

(a+bc)
Therefore, the value of the following formula (1) in Example 11 is 5 mm.
a+bc (1)
(a: the width of the top seal with a notch, normal to the top edge of the standing pouch,
b: the width of the convex seal portion normal to the upper edge of the standing pouch,
c: the width of the notch normal to the upper edge of the standing pouch)

<<Comparative example 1>>
As shown in FIG. 15, a standing pouch was produced in the same manner as in Example 1, except that the convex seal portion and the notch were not produced. In this example, the width (b) of the convex seal portion in the direction normal to the side edge of the standing pouch and the width (c) of the notch in the direction normal to the side edge of the standing pouch are 0 mm. , the value (a+b−c) in equation (1) is 5 mm.

<<Comparative Example 2>>
As shown in FIG. 16, a standing pouch was produced in the same manner as in Example 1, except that the notch was not produced. In this example, the width (c) of the notch normal to the side edge of the standing pouch is 0 mm, so the value (a+b−c) in equation (1) is 10 mm.

<<Comparative Example 3>>
As shown in FIG. 17, the same as Example 1 except that the width (a) of the side seal portion in the normal direction to the side edge of the standing pouch is 10 mm, and the convex seal portion and the notch are not formed. Then, a standing pouch was produced. In this example, the width (b) of the convex seal portion in the direction normal to the side edge of the standing pouch and the width (c) of the notch in the direction normal to the side edge of the standing pouch are 0 mm. , the value (a+b−c) in equation (1) is 10 mm.

<Evaluation of Standing Pouch>
<Steam Permeability>
The prepared standing pouch was heated in a microwave oven (700 W) for 60 seconds. At that time, it was visually confirmed whether the vapor inside the pouch was discharged from the interlayer between the base material layer and the heat seal layer. Each standing pouch was ranged up three times and evaluated according to the following criteria. Table 1 shows the results.
A: Steam was discharged in all three times.
Good: Steam was discharged twice out of three times.
Δ: Steam was discharged once out of three times.
x: Steam was not discharged in all three times.

<Steam passage position>
The prepared standing pouch was heated in a microwave oven (700 W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the side sealing portion or the upper sealing portion on the extension line of the half cut. Each standing pouch was ranged up three times and evaluated according to the following criteria. Table 1 shows the results.
○: Steam was discharged from the side seal part or the upper seal part on the extension line of the half cut at all times.
Δ: Steam was not discharged from the side seal portion or the upper seal portion on the extended line of the half cut in some cases in which steam was discharged.
x: Among the times when steam was discharged, there was no case where it was discharged from the side sealing portion or the upper sealing portion on the extended line of the half cut.

《Consideration》
From Examples 1, 4, and 5, it can be seen that even if the shape of the convex seal portion is acute or obtuse, there is no effect on the steam permeability and the steam passage position, and the steam can be discharged from the intended position. . Further, from Examples 1, 2, and 3, it was found that if the half-cut crossed the convex seal portion, the steam could be discharged from the intended position without affecting the steam permeability and the steam passage position. I understand. In addition, from Example 8, even when a convex seal portion and a notch are formed only on one side of the side seal portion, there is no effect on the steam permeability and the steam passage position, and the steam is discharged from the intended position. It turns out that it was possible.

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

From Example 1 and Comparative Examples 1 and 2, it can be seen that in the case of a standing pouch in which the side sealing portion does not have a notch, steam cannot be discharged from the intended position.

<Reference Examples 1 to 5, Reference Comparative Examples 1 to 5>
In Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5, pillow bags were produced from the composite films, the laminate strength was measured, and the steam permeability when heated in a microwave oven was evaluated.

[material]
In Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5, the following materials were prepared for the layers.

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

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

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

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

<<Reference Examples 1 to 5, Reference Comparative Examples 1 to 4>>
[Manufacture of composite film]
Using the materials shown in Table 2, a film serving as a substrate layer and a film serving as a sealant layer were bonded together with a heat-softening adhesive resin or adhesive to prepare a laminate. The coating amount of the thermosoftening adhesive resin or adhesive was 1.5 g/m ² .

The film that will be the sealant layer in the laminate is cut so that it penetrates in the thickness direction of the sealant layer (half-cut manufacturing process), and then the base layer and the heat-softening adhesive resin layer are laminated on the sheet containing the sealant layer. Then, a composite film having half cuts was obtained.

<<Reference Comparative Example 5>>
[Manufacture of composite film]
Polycoat (registered trademark) P-91/P-91 reducer = 3/1 (DIC Corporation), which is a release varnish, is applied to the Ny #15 nylon film that will be the base layer, and the coating amount is 1.5 g / m ² coated. After the release varnish is dried, using the materials listed in Table 1, in the same manner as in Reference Examples 1 to 5 and Reference Comparative Examples 1 to 4, a film to be a sealant layer is applied to the release varnish coated surface with an adhesive. to produce a laminate.

The film that will be the sealant layer in the laminate is cut so that it penetrates in the thickness direction of the sealant layer (half-cut manufacturing process), and then the base layer and the heat-softening adhesive resin layer are laminated on the sheet containing the sealant layer. Then, a composite film having half cuts was obtained.

《Measurement of laminate strength》
The composite films obtained in Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5 were cut to a width of 15 mm, and the interlayer strength between the base material layer and the sealant layer was measured under an atmosphere of 25°C and an atmosphere of 70°C. It was measured. The measurement was performed under the condition of 300 mm/min with T-shaped peeling, and the section average of the displacement of 20 to 50 mm was obtained. Table 1 shows the results.

[Preparation of pillow bag]
Using the composite films produced in Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5, pillow bags with an inner dimension of 130 mm×135 mm were produced. At this time, a microwaveable container filled with 10 cc of water was sealed inside the pillow bag. In addition, the half-cut was arranged in the sealed portion of the pillow bag so as to traverse the sealed portion from the storage portion of the pillow bag. The pillow bag was manufactured under the conditions of heating for 1.3 seconds and cooling for 2.0 seconds using an impulse sealer.

<Evaluation of steam permeability of pillow bag>
The prepared pillow bag was heated in a microwave oven (700 W) for 60 seconds. At that time, it was visually confirmed whether the steam inside the pouch was discharged from the heat-sealed portion. Each pillow bag was heated up five times and evaluated according to the following criteria. Table 2 shows the results.
○: Vapor was discharged in all 5 times.
x: Steam was not discharged in all five times.

<<Reference Examples 1-5>> Measurement of adhesive strength of heat-softening adhesive resin layer The heat-softening adhesive resin or adhesive used in Reference Examples 1-3 and Reference Comparative Examples 2-3 was It was applied to the surface of a film (Bonyl (registered trademark) RX, Kojin Film & Chemicals Co., Ltd., thickness: 15 μm) at a coating amount of 1.5 g/m ² . Subsequently, an evaluation sample was produced by cutting it into a width of 25 mm and attaching it to a test plate (stainless steel plate). During the application, a pressure roller (2 kg) was reciprocated twice to effect pressure bonding.

The adhesive strength of the produced evaluation sample was measured using a strograph under an atmosphere of 25°C. The measurement was carried out under the condition of 180° peeling and 500 mm/min, and the section average of the displacement of 20 to 50 mm was obtained. Table 3 shows the results.

REFERENCE SIGNS LIST 100 Standing pouch 11 Front sheet 12 Top sealing part 13 Side sealing part 14 Storage part 15 Notch 16 Convex sealing part 17 Steam 10 Composite film 1 Base material layer 2 Adhesive layer 3 Sealant layer H Half cut F Folding line a Standing pouch Width of the notched side and/or top seals normal to the side and/or top edges b Convexity normal to the side and/or top edges of the standing pouch Width of the seal c Width of the notch normal to the side and/or top edge of the standing pouch

Claims (6)

A standing pouch comprising a front sheet, a back sheet, and a bottom sheet heat-sealed at least at the top and side seals to form a container for containing the contents,
At least one of the front sheet and the back sheet is made of a composite film in which at least a base layer, an adhesive layer, and a sealant layer are laminated in this order, and the front surfaces facing each other via the sealant layer the sheet and the back sheet are heat-sealed to form the top seal portion and the side seal portion;
The side seal portion and/or the top seal portion have at least one 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 from the side edge and/or the upper edge of the standing pouch toward the storage portion side of the standing pouch,
The composite film is provided with a half cut applied from the sealant layer side and reaching the adhesive layer,
The half-cut is arranged to reach the unsealed portion, the notch, and/or the notch from the storage portion side of the standing pouch,
standing pouch. The side seal portion and/or the upper seal portion are convex seal portions protruding toward the storage portion side of the standing pouch on the storage portion side of the unsealed portion, the notch, and/or the notch. with
The half-cut is arranged to reach the unsealed portion, the notch, and/or the notch by crossing the convex seal portion from the storage portion side of the standing pouch,
The standing pouch according to claim 1. The standing pouch according to claim 2, which satisfies the following formula (1):
a+bc<10mm (1)
(a: the side seal portion and/or the top seal having the unsealed portion, the notch, and/or the notch normal to the side edge and/or top edge of the standing pouch; part width,
b: the width of the convex seal portion normal to the side edge and/or the top edge of the standing pouch;
c: the width of the unsealed portion, the notch and/or the notch normal to the side and/or top edge of the standing pouch). The adhesive layer is a thermosoftening resin,
The laminate strength at 25° C. between the base layer and the sealant layer is 1.5 N/15 mm or more,
The laminate strength at 70° C. between the base layer and the sealant layer is less than 1.5 N/15 mm.
The standing pouch according to any one of claims 1-3. The standing pouch according to any one of claims 1 to 4, 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 any one of claims 1 to 5, which is for a microwave oven.

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