Standing Pouch

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

[Technical Field]

[0001] The present invention relates to a stand-up pouch, and more particularly to a stand-up pouch that allows water vapor generated from the contents when heated to be released from intended positions in the side seals and / or top seals of the pouch. [Background technology]

[0002] Conventionally, a microwaveable pouch that allows steam to be released from a desired position has been known.

[0003] For example, Patent Document 1 proposes a standing pouch equipped with an automatic steam release mechanism that can release steam generated from the contents to the outside when cooking using a microwave oven. In Patent Document 1, a protruding seal that bends and protrudes toward the inside of the pouch is provided on at least one side edge of the body of the standing pouch, and steam can be released by breaking the protruding seal.

[0004] Patent Document 2 proposes a laminate as a packaging material for a pouch, in which a base layer, a heat-softening layer, and a sealant layer are laminated in this order. The laminate is half-cut from the sealant layer side, and when cooked in a microwave oven, steam is passed through the half-cut at the heat-sealed portion where the sealant layers are heat-sealed together, thereby releasing steam from the pouch. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2020-200048 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-124859 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in order for the standing pouch described in Patent Document 1 to function as an automatic steam release mechanism, it was necessary to weaken the seal strength of the protruding seal portion compared to the seal strength of the side edge portion, and to form the seal width of the protruding seal portion narrower. This not only made the manufacturing process for the standing pouch more complicated, but also sometimes caused problems with the strength of the resulting standing pouch.

[0007] Furthermore, the packaging material described in Patent Document 2 had an adhesive layer between the base layer and the sealant layer in addition to the thermosoftening resin layer. The thermosoftening resin layer was embedded in the adhesive layer and was only located in the half-cut area. Therefore, the packaging material described in Patent Document 2 had problems in that not only was the manufacturing process for the laminate complicated, but the cost was also high.

[0008] Furthermore, when a stand-up pouch is made from the packaging material described in Patent Document 2, it may be difficult to release steam from the intended position due to the shape of the space for storing the contents in the stand-up pouch.

[0009] Specifically, standing pouches are generally formed by folding and sealing the bottom of the pouch, resulting in a structure in which the space at the bottom is wide and the space at the top is narrow. The peeling force caused by the pressure of steam generated by heating is most strongly exerted on the top seal of the pouch, which is the narrower space. Therefore, even if a steam vent mechanism is provided in the body of the pouch, the difference in peeling force makes it difficult for the steam vent mechanism to function, and in some cases, the top seal of the pouch may burst, causing the pouch to tear.

[0010] The present invention has been made in view of the above-mentioned background, and aims to provide a standing pouch that is capable of venting water vapor generated from the contents when heated from an intended position in the side seal and / or top seal of the pouch. [Means for solving the problem]

[0011] The present inventors conducted extensive research to solve the above-mentioned problems. As a result, they discovered that steam can be released from an intended position in the side seal and / or top seal of the pouch by providing the side seal and / or top seal of a stand-up pouch with at least one selected from the group consisting of an unsealed portion where the sealant layer is not heat-sealed, a slit, and a cutout, which protrudes from the side edge and / or top edge of the stand-up pouch toward the storage section of the stand-up pouch, and by arranging a half cut made from the sealant layer side so as to cross the unsealed portion, the slit, and / or the cutout from the storage section side of the stand-up pouch. This discovery led to the completion of the present invention.

[0012] <<Aspect 1>> A stand-up pouch comprising a front sheet, a back sheet, and a bottom sheet, which are heat-sealed at least at a top seal and a side seal to form a container for containing 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 sheet and the back sheet facing each other are heat-sealed via the sealant layer to form the top seal portion and the side seal portion; the side sealed portion and / or the top sealed portion has 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 slit, and a notch; the unsealed portion, the incision, and / or the notch protrude from a side edge and / or an upper edge of the standing pouch toward the storage portion of the standing pouch, the composite film has a half cut made from the sealant layer side and reaching the adhesive layer, The half cut is arranged so as to reach the unsealed portion, the incision, and / or the notch from the storage portion side of the standing pouch. Standing pouch. <<Aspect 2>> the side seal portion and / or the top seal portion has a convex seal portion that protrudes toward the storage portion side of the standing pouch on the storage portion side of the unsealed portion, the slit, and / or the notch, The half cut is arranged so as to extend from the storage section side of the standing pouch across the convex seal section and reach the unsealed section, the incision, and / or the notch. 2. The stand-up pouch according to embodiment 1. Aspect 3 The standing pouch according to aspect 2, which satisfies the following formula (1): a+bc<10mm (1) (a: the width of the side seal portion and / or the top seal portion having the unsealed portion, the incision, and / or the notch in the direction normal to the side edge and / or the top edge of the standing pouch, b: the width of the convex seal portion in the direction normal to the side edge and / or upper edge of the standing pouch, c: The width of the unsealed portion, the slit, and / or the notch in the direction normal to the side edge and / or top edge of the standing pouch. Aspect 4 the adhesive layer is a thermosoftening resin, The laminate strength between the base layer and the sealant layer at 25°C is 1.5 N / 15 mm or more; The laminate strength between the substrate layer and the sealant layer at 70°C is less than 1.5 N / 15 mm; A standing pouch according to any one of aspects 1 to 3. Aspect 5 Aspect 5. The standing pouch according to any one of Aspects 1 to 4, wherein the adhesive layer has an adhesive strength in accordance with JIS Z0237 of 1.0 N / 25 mm or more. Aspect 6 Aspect 6. The standing pouch according to any one of aspects 1 to 5, which is for use in a microwave oven. [Effects of the Invention]

[0013] According to the standing pouch of the present invention, water vapor generated from the contents when heated can be released from the intended position in the side seal and / or top seal of the pouch.

[0014] Furthermore, when only one adhesive layer is disposed between the base layer and the sealant layer, the manufacturing process of the composite film can be simplified, which can contribute to the production capacity and production costs of the standing pouch. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a front view of a standing pouch according to an embodiment of the present invention. [Figure 2] 1 is a cross-sectional view of a composite film constituting a standing pouch according to one embodiment of the present invention. [Figure 3] 1 is a schematic diagram of a composite film used in a standing pouch according to one embodiment of the present invention when steam is released. [Figure 4] FIG. 1 is a front view of a standing pouch of Example 1. [Figure 5] FIG. 1 is a front view of a standing pouch according to a second embodiment. [Figure 6] FIG. 10 is a front view of the standing pouch of Example 3. [Figure 7] FIG. 10 is a front view of the standing pouch of Example 4. [Figure 8] FIG. 10 is a front view of the standing pouch of Example 5. [Figure 9] FIG. 10 is a front view of the standing pouch of Example 6. [Figure 10] FIG. 10 is a front view of the standing pouch of Example 7. [Figure 11]FIG. 10 is a front view of the standing pouch of Example 8. [Figure 12] FIG. 10 is a front view of the standing pouch of Example 9. [Figure 13] FIG. 12 is a front view of the standing pouch of Example 10. [Figure 14] FIG. 11 is a front view of the standing pouch of Example 11. [Figure 15] FIG. 1 is a front view of a standing pouch of Comparative Example 1. [Figure 16] FIG. 1 is a front view of a standing pouch of Comparative Example 2. [Figure 17] FIG. 10 is a front view of the standing pouch of Comparative Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0016] Standing pouch The stand-up pouch of the present invention is a stand-up 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 storing 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 opposing front sheet and back sheet are heat-sealed via the sealant layer to form a top seal portion and a side seal portion; the side sealed portion and / or the upper sealed portion has 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 slit, and a notch; the unsealed portion, the cutout, and / or the notch protrudes from the side edge and / or the top edge of the stand-up pouch toward the storage portion of the stand-up pouch, the composite film has a half cut made from the sealant layer side and reaching the adhesive layer; The half cut is arranged so as to reach the unsealed portion, the cutout, and / or the notch from the storage portion side of the standing pouch.

[0017] According to the stand-up pouch of the present invention, the half cut is positioned so as to reach the unsealed portion, the cutout, and / or the notch from the storage section side of the stand-up pouch, thereby enabling the water vapor generated from the contents by heating to be discharged from the intended position in the side seal section and / or top seal section of the pouch, i.e., the unsealed portion, the cutout, and / or the notch.

[0018] Without being limited by theory, this is thought to be because, on the storage side of the side seal portion and / or top seal portion, where peeling force due to water vapor pressure is more likely to be applied, water vapor penetrates through the half cut in the thickness direction of the composite film, causing interlayer delamination between the adhesive layer and the sealant layer and creating a space for steam to escape; on the other hand, on the side edge side and / or top edge side of the side seal portion and / or top seal portion, where peeling force due to water vapor pressure is less likely to be applied, steam escapes through pre-formed unsealed portions, cuts, and / or notches.

[0019] As described above, the stand-up pouch of the present invention has a structure in which the front sheet, back sheet, and bottom sheet are heat-sealed at least at the top seal and the side seal to form a storage section for storing contents.

[0020] 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 opposing front sheet and back sheet are heat-sealed via the sealant layer to form an upper seal portion and a side seal portion.

[0021] 1 shows a front view of a stand-up pouch 100 according to one embodiment of the present invention. The stand-up pouch of the present invention has a front sheet 11, a back sheet (not shown), and a bottom sheet (not shown) that are heat-sealed at least at a top seal portion 12 and a side seal portion 13 to form a storage portion 14 for storing contents.

[0022] In the stand-up pouch 100 shown in Fig. 1, the front sheet 11, back sheet, and bottom sheet are formed from a single continuous composite film. Specifically, a single composite film comprising at least a base layer, an adhesive layer, and a sealant layer is mountain-folded at two locations that will become the bottom of the stand-up pouch with the sealant layer facing inward, and then valley-folded along the folding line indicated by F in Fig. 1, thereby folding in the area that will become the bottom sheet and forming the area that will become the front sheet 11 and the area that will become the back sheet. Then, both side edges of the area that will become the front sheet 11, both side edges of the folded-in bottom sheet, and both side edges of the area that will become the back sheet are overlapped and heat-sealed, thereby forming side seals 13 on both side edges that form the body of the stand-up pouch 100.

[0023] The front sheet, back sheet, and bottom sheet may be a single continuous composite film as described above, or may be separate, independent discontinuous sheets, or may be a combination of a partially continuous sheet and a discontinuous sheet.

[0024] Furthermore, 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 having at least a base layer, an adhesive layer, and a sealant layer laminated in this order. When only one of the front sheet and the back sheet is the composite film, the top seal and the side seal are formed by heat sealing to the other sheet with the sealant layer of the composite film.

[0025] When 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 can be selected appropriately depending on the performance, etc., that is desired to be imparted to the standing pouch to be produced.

[0026] <Unsealed areas, cuts, and / or notches> The stand-up pouch of the present invention has at least one selected from the group consisting of an unsealed portion where the front sheet and back sheet are not heat-sealed, a slit, and a notch in the side seal portion and / or the top seal portion, and the unsealed portion, slit, and / or the notch are formed so as to protrude from the side edge (the outer edge of the standing pouch in the side seal portion) and / or the top edge (the outer edge of the standing pouch in the top seal portion) of the standing pouch toward the storage section of the standing pouch.

[0027] The unsealed portion that the stand-up pouch of the present invention may have, where the front sheet and the back sheet are not heat-sealed, is a portion where the front sheet and the back sheet are not adhered to each other.

[0028] The method for producing the unsealed portion is not particularly limited, but it can be produced, for example, by providing an area to which heat is not applied within the sealed region when forming the side sealed portion and / or the top sealed portion. Alternatively, it can be produced by heat-sealing the front sheet and the back sheet to form the side sealed portion and / or the top sealed portion, and then peeling off a portion of the side sealed portion and / or the top sealed portion.

[0029] The incision that the standing pouch of the present invention may have is a linear cut that starts from the side edge (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) of the standing pouch, and may be a straight or curved cut.

[0030] The method for making the incisions is not particularly limited, but for example, after forming the side seals and / or top seals, the side edges (outer edges of the side seals) and / or top edges (outer edges of the top seals) of the standing pouch can be used to cut through the inside of the side seals and / or top seals toward the storage section of the standing pouch using a cutting tool such as a cutter, knife, or scissors. Alternatively, incisions can be made in the sides and / or top of both the front sheet and the back sheet, and the front sheet and the back sheet can be heat-sealed while aligning the incisions to form the side seals and / or top seals with the incisions. Alternatively, the side seals and / or top seals with the incisions can be made by making incisions in the side and / or top of at least one of the front sheet and the back sheet, which is made of the composite film.

[0031] The cutout that the standing pouch of the present invention may have is a cutout having a certain area that starts from the side edge (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) of the standing pouch.

[0032] The shape of the cutout is not particularly limited, and may be any of a variety of shapes, such as a triangle, a rectangle, a polygon, or a semicircle, with the bottom edge being the side edge 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).

[0033] The method for creating the cutouts is not particularly limited. For example, after forming the side seals and / or top seals, the side edges (outer edges of the standing pouch at the side seals) and / or top edges (outer edges of the standing pouch at the top seals) of the standing pouch can be cut out in the desired shape using a cutting tool such as a knife or scissors. Alternatively, cutouts of the desired shape can be created in the sides and / or top of the front sheet and back sheet, respectively, so that the side edges (outer edges of the sheets) and / or top edges (outer edges of the sheets) form the bottom edges, and the front sheet and back sheet are heat-sealed while aligning the cutouts to create the side seals and / or top seals with the cutouts. Alternatively, the side seals and / or top seals with the cutouts can be created by creating cutouts in the side and / or top of at least one of the front sheet and back sheet made of the composite film.

[0034] The standing pouch 100 shown in Fig. 1 has one triangular cutout 15 in the side seal 13. The cutout 15 is formed so as to start from a side edge of the standing pouch 100 (a side end of the side seal 13) and protrude toward the storage section 14 of the standing pouch. Specifically, the side seal 13 is cut out to form a triangular cutout 15, with the side edge of the standing pouch 100 (the outer end of the side seal 13 of the standing pouch 100) serving as the base and the apex protruding toward the storage section 14 of the standing pouch 100.

[0035] In the standing pouch 100 shown in FIG. 1, steam 17 is emitted from the cutout 15 when heated in a microwave oven or the like.

[0036] <Half cut> The composite film used in the present invention has a half cut made from the sealant layer side to reach the adhesive layer, and therefore the standing pouch of the present invention produced using the composite film for at least one of the front sheet and back sheet has a half cut made from the sealant layer side of the composite film to reach the adhesive layer.

[0037] Here, the half cut refers to a cut formed in the thickness direction of the composite film, but not penetrating the composite film in the thickness direction.

[0038] The half cut in the standing pouch of the present invention is positioned so as to reach the unsealed portion, the slit, and / or the notch described above. When heated in a microwave oven or the like, steam can be released from the point in the unsealed portion, the slit, and / or the notch where the half cut reaches. By locating these at intended positions in the side seal portion and / or the top seal portion, steam can be released from the intended positions.

[0039] The stand-up pouch of the present invention uses a composite film with a half-cut on at least one of the front sheet and back sheet, and the sealant layer of the composite film is heat-sealed to the opposing front sheet and back sheet. As a result, the sealant layer is on the inside of the stand-up pouch, i.e., the layer in contact with the contents. Therefore, steam generated from the contents when heated penetrates the composite film in the thickness direction through the half-cut.

[0040] Therefore, the standing pouch of the present invention is provided with the above-mentioned unsealed portions, cuts, and / or notches, as well as half cuts arranged to reach these, at the locations where steam needs to be released, making it possible to release steam from the intended location.

[0041] A cross-sectional view of one embodiment of a composite film used in the present invention is shown in Figure 2. The composite film 10 shown in Figure 2 includes a base layer 1, an adhesive layer 2 laminated on the inner side of the base layer 1, and a sealant layer 3 laminated on the inner side of the adhesive layer 2.

[0042] 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.

[0043] The depth of the half cut may be up to the surface of the adhesive layer, or may be up to the inside of the adhesive layer, or may even penetrate through the adhesive layer.

[0044] However, the half cut is preferably deep enough not to reach the base layer, which is the outermost layer of the composite film, since if the half cut reaches the base layer, the strength of the standing pouch formed from the composite film may decrease.

[0045] In particular, it is preferable that the half cut is made only in the sealant layer. If the half cut can be made only in the sealant layer, the strength of the standing pouch can be maximized and the effects of the present invention can be enjoyed.

[0046] The shape of the half cut may be either a continuous line or an intermittent line. Furthermore, as long as there is at least one, there is no limit to the number. When multiple half cuts are provided, it is preferable that the half cuts are approximately parallel to each other. Furthermore, when multiple half cuts are provided, it is not necessary for all of the half cuts to reach the unsealed portion, the incision, and / or the notch; it is sufficient that at least one of the half cuts reaches the unsealed portion, the incision, and / or the notch.

[0047] The length of the half cut is not particularly limited, and may be such that it is provided only in the area where steam release is desired, or may be provided across the entire width of the standing pouch.

[0048] The method for forming the half cut is not particularly limited, and for example, a method of forming the half cut by using a laser or the like after forming the composite film can be mentioned.

[0049] Alternatively, a half-cut may be made during the production of the composite film, and the layer having the half-cut may be laminated with other layers to form the composite film used in the present invention. In this case, for example, a method may be used in which a rotary die cutter is used to make a cut that penetrates the sealant layer in the thickness direction (half-cut making step), and then a base layer and an adhesive layer are laminated on the sheet containing the sealant layer (lamination step).

[0050] <Convex seal part> The standing pouch of the present invention may have a convex seal portion in the side seal portion and / or the top seal portion that protrudes toward the storage portion side of the standing pouch on the storage portion side of the unsealed portion, slit, and / or notch described above.

[0051] When a convex seal portion is provided, the half cut is positioned so as to cross the convex seal portion from the storage portion side of the standing pouch to the side edge and reach the unsealed portion, the cutout, and / or the notch.

[0052] The convex seal portions are seal portions formed by heat sealing the sealant layer of the composite film to the opposing front and back sheets.

[0053] 1 has a single triangular cutout 15 formed in side seal 13, starting from the side edge of standing pouch 100 (the side end of side seal 13) and protruding toward storage section 14 of the standing pouch. Also, on the storage section 14 side of cutout 15, there is a triangular convex seal 16 that protrudes toward storage section 14 of standing pouch 100.

[0054] The triangular convex seal portion 16 is formed so that its base is the side edge of the storage section 14 of the standing pouch 100 (the end portion of the side seal portion 13 on the storage section 14 side) and its apex protrudes inside the storage section 14 of the standing pouch 100.

[0055] The half cut H is arranged so as to pass through the apex of the triangle of the convex seal portion 16 , cross the convex seal portion 16 , and reach the apex of the triangle of the notch 15 .

[0056] When the standing pouch of the present invention is provided with a convex seal portion, steam generated from the contents exerts greater pressure on the convex seal portion than on other portions, making it easier to release steam from the intended location.

[0057] The shape of the convex seal portion is not particularly limited, and may be, for example, a triangle, a rectangle, a polygon, a semicircle, or any other shape whose base is the side edge of the storage portion of the standing pouch (the end of the side seal portion on the storage portion side) and / or the top edge (the end of the top seal portion on the storage portion side). Of these, from the viewpoint of utilizing stress concentration due to steam pressure, a triangle, a rectangle, or a polygon having corners is preferred, and a triangle is even more preferred.

[0058] <Relationship between side seal portion and / or upper seal portion, convex seal portion, unsealed portion, cutout, and / or notch> In the standing pouch of the present invention, the side seals and / or top seals, the convex seals, and the unsealed portions, cuts, and / or notches may satisfy the relationship of the following formula (1). a+bc<10mm (1) (a: width of the side seal portion and / or top seal portion having the unsealed portion, the cutout, and / or the notch in the direction normal to the side edge and / or the top edge of the standing pouch, b: Width of the convex seal portion in the direction normal to the side edge and / or upper edge of the standing pouch, c: Width of the unsealed portion, slit, and / or notch in the direction normal to the side edge and / or top edge of the standing pouch)

[0059] When the standing pouch of the present invention satisfies the relationship of the above formula (1), steam can be released more reliably from the intended position.

[0060] The standing pouch may satisfy the relationship of the following formula (2), or may satisfy the relationship of the following formula (3). a+bc<8mm (2) a+bc<6mm (3) (In formulas (2) and (3), a, b, and c are the same as those in formula (1) above.)

[0061] Composite film The composite film used in the standing pouch of the present invention is a composite film having at least a base layer, an adhesive layer, and a sealant layer laminated in this order, and as described above, has a half cut that is made from the sealant layer side and reaches the adhesive layer.

[0062] A cross-sectional view of one embodiment of a composite film used in the present invention is shown in Figure 2. The composite film 10 shown in Figure 2 includes a base layer 1, an adhesive layer 2 laminated on the inner side of the base layer 1, and a sealant layer 3 laminated on the inner side of the adhesive layer 2.

[0063] 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.

[0064] The composite film used in the present invention includes a base layer, an adhesive layer, and a sealant layer as essential components, and these layers may be laminated in this order. In the present invention, an optional layer may be provided in addition to the base layer, adhesive layer, and sealant layer. Examples of the optional layer include a barrier layer for imparting barrier properties, a reinforcing layer for reinforcing strength, and an adhesive layer for bonding layers together.

[0065] The location of the optional layer is not particularly limited, and for example, the optional layer may be present between the substrate layer, adhesive layer, and sealant layer, or on the outside of the laminate containing these layers.

[0066] In addition, if no layers other than the adhesive layer are disposed between the base layer and the sealant layer, the manufacturing process of the composite film can be simplified, which can contribute to production capacity and production costs.

[0067] The thickness of each layer constituting the composite film used in the present invention can be appropriately determined depending on the intended use of the standing pouch to be formed.

[0068] <Base material layer> The substrate layer is an essential constituent layer in the composite film used in the standing pouch of the present invention.

[0069] The composite film used in the stand-up pouch of the present invention has a base layer, an adhesive layer, and a sealant layer laminated in this order, and the base layer is the outer layer of the stand-up pouch. Therefore, the base layer can serve as a protective layer when the innermost sealant layer is heat-sealed to form the stand-up pouch. The base layer can also serve as a printing layer on which printing is performed to indicate the contents, etc.

[0070] The material constituting the base layer is not particularly limited as long as it is a resin, particularly a resin that can be used as a protective layer and is printable. Commonly used resins can be used, for example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE), polypropylene (PP), and polystyrene (PS), polyamides (PA) such as nylon-6 and nylon-66, and polycarbonate (PC).

[0071] The resins constituting the base layer may be one type or a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0072] The substrate layer is preferably made from a preformed film. The film to be 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 these, a biaxially stretched film is preferred.

[0073] Furthermore, a metal such as aluminum or an oxide such as silicon oxide or aluminum oxide may be vapor-deposited on the film that serves as the substrate layer.

[0074] Furthermore, the film serving as the substrate layer may be a single layer or a laminate consisting of multiple layers.

[0075] <Adhesive layer> The adhesive layer is an essential constituent layer of the composite film used in the standing pouch of the present invention, and is disposed between the base layer and the sealant layer.

[0076] When the composite film used in the standing pouch of the present invention is configured so that no layers other than the adhesive layer are disposed between the base layer and the sealant layer, the manufacturing process of the composite film can be simplified, which can contribute to production capacity and production costs.

[0077] The material for the adhesive layer is not particularly limited, and examples thereof include polyolefin, polyester, polyether, polyamide, polylactic acid, and thermoplastic elastomer.

[0078] (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 laminate strength. Specifically, the adhesive layer may be a thermosoftening resin that provides a laminate strength of 1.5 N / 15 mm or more between the base layer and the sealant layer at 25°C and a laminate strength of less than 1.5 N / 15 mm between the base layer and the sealant layer at 70°C.

[0079] If the lamination strength between the base layer and the sealant layer at 25°C 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 peeling or the like will not occur between the base layer and the sealant layer during storage and handling.

[0080] The laminate strength at 25°C between the substrate layer and the sealant layer may be 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.

[0081] On the other hand, the laminate strength at 25°C between the substrate layer and the sealant layer may be 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, 3.5 N / 15 mm or less, or 3.0 N / 15 mm or less.

[0082] Furthermore, if the laminate strength between the base layer and the sealant layer at 70°C is less than 1.5 N / 15 mm, when a standing pouch formed from the composite film is heated, spaces are more likely to be formed in the heat-softenable adhesive resin layer, and steam can be moved through these spaces, thereby achieving steam release performance equivalent to that of conventional pouches.

[0083] The laminate strength at 70°C between the substrate layer and the sealant layer may be 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.

[0084] On the other hand, the laminate strength at 70°C between the substrate layer and the sealant layer may be 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 or more, 0.4 N / 15 mm or more, or 0.5 N / 15 mm or more.

[0085] When the adhesive layer of the composite film used in the stand-up pouch of the present invention has the above-mentioned laminate strength, the laminate strength between the base layer and the sealant layer at 25°C is greater than the laminate strength at 70°C. That is, when a standing pouch formed from the composite film is heated in a microwave oven or the like, the laminate strength between the base layer and the sealant layer decreases due to the temperature increase, making it easier to form spaces in the softening resin layer, which is the adhesive layer. The formed spaces then allow steam generated from the contents to migrate.

[0086] Furthermore, when the adhesive layer of the composite film used in the standing pouch of the present invention has the above-mentioned lamination strength, even if only one adhesive layer made of a thermosoftening resin is disposed between the base layer and the sealant layer, a standing pouch having vapor release performance equivalent to that of conventional pouches can be realized.

[0087] Examples of commercially available materials that can achieve the above laminate strength include LX-500 (DIC Corporation), Elitel (registered trademark) XP-1648-45EA (Unitika Ltd.), and TM-396 (Toyo-Morton Co., Ltd.).

[0088] (Adhesive strength) The adhesive layer of the composite film used in the standing pouch of the present invention may have an adhesive strength in accordance with JIS Z0237 of 1.0 N / 25 mm or more.

[0089] If the adhesive layer has an adhesive strength of 1.0 N / 25 mm or more in accordance with JIS Z0237, it will have sufficient adhesion to adjacent layers, and problems such as peeling can be avoided when storing and handling standing pouches made from the composite film.

[0090] Furthermore, since there is no need to provide a layer between the base layer and the sealant layer to strengthen adhesion, the manufacturing process for the composite film can be simplified, which contributes to production capacity and production costs.

[0091] The adhesive strength of the adhesive layer according to JIS Z0237 may be 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.

[0092] On the other hand, the adhesive strength of the adhesive layer according to JIS Z0237 may be 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, 5.0 / 25 mm or less, or 4.0 N / 25 mm or less.

[0093] (sealant layer) The sealant layer is an essential constituent layer in the composite film used in the present invention.

[0094] The sealant layer is the layer that is heat-sealed when forming a standing pouch, and therefore the sealant layer is disposed so as to be the innermost layer of the composite film.

[0095] The material for the sealant layer is not particularly limited as long as it is heat-sealable and can provide sufficient sealing strength to the molded standing pouch. Known materials can be used, such as 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, and ethylene-vinyl acetate copolymer (EVA).

[0096] The sealant layer will form a space for filling the contents in the resulting standing pouch, and therefore may be made of, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or the like to provide resistance to the contents.

[0097] The sealant layer may be formed using a film preformed from the above-mentioned material, or may be formed by melting and extruding a material for forming the sealant layer onto the surface of a laminate comprising a base layer, an adhesive layer, and optionally other layers, and then cooling and solidifying the material.

[0098] Furthermore, the resins constituting the sealant layer may be one type or a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0099] Furthermore, the sealant layer may be a single layer or may be a multi-layer structure.

[0100] <Other layers> The composite film used in the standing pouch of the present invention may contain layers other than the base layer, adhesive layer, and sealant layer as long as they contain the base layer, adhesive layer, and sealant layer as essential constituent layers.

[0101] The other layers are not particularly limited, and examples thereof include a barrier layer for imparting barrier properties, a reinforcing layer for reinforcing strength, and an adhesive layer for bonding layers together.

[0102] Examples of barrier layers for imparting barrier properties include layers made of ethylene-vinyl alcohol copolymer (EVOH), nylon (NY), polyvinylidene chloride (PVDC), or polyacrylonitrile (PAN), which exhibit the function of blocking gases such as oxygen and water vapor.

[0103] Examples of materials for the reinforcing layer to reinforce the strength include paper, synthetic paper, nonwoven fabric, etc. These may be coated with an adhesive to provide adhesion to adjacent layers. Also, a layer made of the material constituting the above-mentioned base layer may be provided as a reinforcing layer, separate from the base layer.

[0104] Examples of adhesive layers for bonding layers include layers made of ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ionomer.

[0105] The other layer may be a layer made of an adhesive used when dry laminating or hot melt laminating layers together.

[0106] The resins constituting the other layers may be one type or a blend of two or more types. If necessary, additives may be added to impart functionality.

[0107] <<Function of the standing pouch>> The function of the stand-up pouch of the present invention will be described below with reference to the drawings. Fig. 1 is a front view of a stand-up pouch formed using the above-mentioned composite film as a front sheet, Fig. 2 is a cross-sectional view of the composite film used as the front sheet, and Fig. 3 is a schematic view of the composite film used in the stand-up pouch when steam is released.

[0108] The composite film 10 that forms the front sheet 11 of the standing pouch 100 shown in Fig. 1 is a laminate made up of a base layer 1, an adhesive layer 2, and a sealant layer 3, as shown in Fig. 2. As shown in Fig. 1, in the composite film 10 that forms the front sheet 11, each layer extends on an XY plane formed by the X direction and the Y direction, and the Z direction (not shown) is the thickness direction of the composite film 10. That is, Fig. 1 is a front view of the standing pouch 100 as seen from the base layer 1 side.

[0109] In the composite film 10 constituting the standing pouch 100 shown in Figure 1, the half cuts H are arranged in intermittent straight lines and are positioned so as to extend from the storage section 14 side of the standing pouch 100 to the side edge, cross the convex seal section 16 of the standing pouch 100, and reach the notch 15 in the side seal section 13.

[0110] When such a standing pouch 100 is heated and steam is generated from the contents filled in the storage section 14 of the standing pouch 100, the generated steam 17 is discharged to the outside of the standing pouch 100 through the notch 15 in the side seal section 13, as shown in Figure 1.

[0111] Here, the action of steam 17 being discharged to the outside of standing pouch 100 through notch 15 of side seal portion 13 will be described with reference to FIG.

[0112] Figure 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, and shows the state in which, when the standing pouch 100 is heated and steam 17 is generated from the contents of the standing pouch 100, the adhesive layer 2 of the composite film 10 is softened by the steam 17.

[0113] Steam 17 generated inside standing pouch 100 penetrates through half cut H formed in sealant layer 3 of composite film 10 in the thickness direction (Z direction) of composite film 10, and when it reaches adhesive layer 2, it directly applies heat to adhesive layer 2. This causes adhesive layer 2 to soften and become flexible.

[0114] The pressure inside the standing pouch 100 increases due to the pressure of steam 17 generated from the contents. As shown in Fig. 3, the increase in internal pressure causes delamination between the softened adhesive layer 2 and sealant layer 3, and the adhesive layer 2 is lifted to the outside of the standing pouch 100 by the pressure of steam 17, forming a space 6 in the delaminated area.

[0115] Then, steam 17 generated from the contents moves to the side seal portion 13 through the space 6 that appears in the area of ​​the half cut H that is arranged across the convex seal portion 16, and when it reaches the notch 15 in the side seal portion 13, it is discharged from the notch 15 to the outside of the standing pouch 100.

[0116] <<Uses of Stand-Up Pouches>> The use of the stand-up pouch of the present invention is not particularly limited. Examples of contents that can be filled include liquids such as gels, gels, and even pastes. Examples of liquids include pharmaceuticals, quasi-drugs, cosmetics, detergents, foods, and paints.

[0117] Examples of pharmaceuticals and quasi-drugs include injections, drip infusions, infusions, perfusions, decoctions, etc. Examples of cosmetics include shampoos, conditioners, hair styling products (e.g., hair water, hair liquid, grease, etc.), etc. Examples of detergents include neutral detergents, alkaline detergents, and acidic detergents. Examples of foods include beverages, cooking oils, soups, creams, liquid seasonings (e.g., soy sauce, vinegar, noodle soup, simmered sauce, mirin, Worcestershire sauce, dressings, ketchup, Tabasco, sweeteners, etc.), etc. Examples of paints include paints, varnishes, oil stains, etc.

[0118] The contents may be in the form of a gel, a gel or a paste, and examples thereof include toothpaste, wasabi, jelly, jam, miso, etc.

[0119] The stand-up pouch of the present invention is capable of venting steam generated from the contents when heated, making it extremely useful as a stand-up pouch for microwave ovens. Therefore, it is extremely useful for storing food and other items that are heated in a microwave oven while the contents are stored in the stand-up pouch. [Example]

[0120] EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these.

[0121] <Examples 1 to 11 and Comparative Examples 1 to 3> In Examples 1 to 11 and Comparative Examples 1 to 3, standing pouches that are variations of the standing pouch shown in FIG. 1 were produced, and the steam permeability and steam passage position when heated in a microwave oven were evaluated.

[0122] [material] The materials of the standing pouches produced in Examples 1 to 11 and Comparative Examples 1 to 3 are shown below.

[0123] (1) Base material layer OPP: Biaxially oriented PP film (Pylen (registered trademark) P2161, Toyobo Co., Ltd., thickness: 20 μm)

[0124] (2) Thermoplastic resin layer TM-396 / CAT-22B (Toyo Morton Co., Ltd.)

[0125] (3) Sealant layer CPP: Unstretched PP film (Pylen (registered trademark) P1128, Toyobo Co., Ltd., thickness: 50 μm)

[0126] (4) PET film layer PET: PET film (Ester (registered trademark) Film E5100, Toyobo Co., Ltd., thickness: 12 μm)

[0127] (5) Adhesive LX-500 / KR-90S (DIC Corporation)

[0128] [Preparation of composite film] A PET film and a CPP film that would serve as a sealant layer were bonded together with an adhesive to produce a sealant laminate, which was then cut intermittently in a straight line through the thickness direction (half-cut production process).

[0129] An OPP film, which serves as a base layer, was bonded to the PET film side of the sealant laminate with the cut using a heat-softening adhesive resin to prepare a composite film laminate. The coating amount of the heat-softening adhesive resin was 2.0 g / m. 2 It was decided.

[0130] Example 1 [Standing pouch production] The heat seal layers of the prepared composite films were placed facing each other to prepare a standing pouch having outer dimensions of 140 mm in width, 140 mm in height, and a folded width of 30 mm, as shown in Figure 4. At this time, the inside of the standing pouch was filled with Kimwipes (registered trademark) L-100 (470 mm x 425 mm) and 20 g of water.

[0131] The half cut was placed so that it crossed both side seals and the container, from one side seal of the standing pouch to the other side seal.The conditions for making the standing pouch were heating for 1.0 seconds and cooling for 2.0 seconds using an impulse sealer.

[0132] (Creating the side seal) In Example 1, a standing pouch as shown in Fig. 4 was produced. Specifically, the side seal portion was produced so that the width (a) in the normal direction to the side edge of the standing pouch was 5 mm.

[0133] (Making the convex seal part) Next, two triangular convex seals were formed on both side seals on the extensions of the half cuts, with the end of the stand-up pouch on the storage section side as the base and the apex protruding inside the storage section. At this time, the half cuts were positioned so that they passed through the apex of the triangle, and the width (b) of the convex seals in the direction normal to the side edge of the standing pouch was 5 mm.

[0134] (Creating the notch) Next, two equilateral triangular notches were made in both side seals on the half-cut extension line, with the outer edge of the standing pouch in the side seal as the base and the apex protruding toward the container section. The width (c) of the notches in the direction normal to the side edge of the standing pouch was 5 mm.

[0135] (a+bc) Therefore, the value of the following formula (1) in Example 1 is 5 mm. a+bc (1) (a: width of the side seal portion having the notch in the direction normal to the side edge of the standing pouch, b: Width of the convex seal 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)

[0136] 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 approximately the center of the upper side of the equilateral triangle that would become the convex seal portion.

[0137] 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 approximately the center of the bottom side of the equilateral triangle that would become the convex seal portion.

[0138] 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 cutout was an acute triangle.

[0139] 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 cutout was an obtuse triangle.

[0140] Example 6 A standing pouch was produced in the same manner as in Example 1, except that the shape of the convex seal was changed to an acute triangle and the width (b) of the convex seal in the direction normal to the side edge of the standing pouch was changed to 7 mm, as shown in Figure 9. In this example, the value (a + bc) of formula (1) is 7 mm.

[0141] 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 and a notch were formed on only one side of the side seal.

[0142] 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 made rectangular and the half cut was arranged so as to pass through approximately the center of the rectangle.

[0143] 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.

[0144] Example 10 As shown in Figure 13, a standing pouch was produced in the same manner as in Example 1, except that the width (a) of the side seal in the direction normal to the side edge of the standing pouch was 10 mm and no convex seal was produced. In this example, the width (b) of the convex seal in the direction normal to the side edge of the standing pouch was 0 mm, so the value (a + bc) of formula (1) was 5 mm.

[0145] Example 11 [Standing pouch production] The heat seal layers of the prepared composite films were placed facing each other to prepare a standing pouch having outer dimensions of 140 mm in width, 140 mm in height, and a folded width of 30 mm, as shown in Fig. 14. At this time, the inside of the standing pouch was filled with Kimwipes (registered trademark) L-100 (470 mm x 425 mm) and 20 g of water.

[0146] The half cut was placed from the top seal of the standing pouch, across the container, and to the bottom seal of the standing pouch, crossing both seals and the container. The standing pouch was made using an impulse sealer with heating for 1.0 seconds and cooling for 2.0 seconds.

[0147] (Making the upper seal) In Example 11, a standing pouch as shown in Fig. 14 was produced. Specifically, the upper seal portion was produced so that the width (a) in the normal direction to the upper edge of the standing pouch was 5 mm.

[0148] (Making the convex seal part) Next, one triangular convex seal was formed on the upper seal, which was an extension of the half cut, so that the end of the standing pouch on the storage section side became the base and the apex protruded inside the storage section. At this time, the half cut was positioned so that it passed through the apex of the triangle, and the width (b) of the convex seal in the direction normal to the upper edge of the standing pouch was 5 mm.

[0149] (Creating the notch) Next, an equilateral triangular notch was made in the upper seal on the extension line of the half cut, with the outer edge of the standing pouch in the upper seal as the base and the apex protruding toward the container section. The width (c) of the notch in the direction normal to the upper edge of the standing pouch was 5 mm.

[0150] (a+bc) Therefore, the value of the following formula (1) in Example 11 is 5 mm. a+bc (1) (a: width of the upper seal portion having the notch in the direction normal to the upper edge of the standing pouch, b: Width of the convex seal 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)

[0151] 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 cutout 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 cutout in the direction normal to the side edge of the standing pouch are 0 mm, so the value (a + bc) of formula (1) is 5 mm.

[0152] Comparative Example 2 As shown in Fig. 16, a standing pouch was produced in the same manner as in Example 1, except that no notch was made. In this example, the width (c) of the notch in the direction normal to the side edge of the standing pouch was 0 mm, so the value (a + bc) of formula (1) was 10 mm.

[0153] Comparative Example 3 17, a standing pouch was produced in the same manner as in Example 1, except that the width (a) of the side seal in the direction normal to the side edge of the standing pouch was 10 mm, and no convex seal or cutout was produced. In this example, the width (b) of the convex seal in the direction normal to the side edge of the standing pouch and the width (c) of the cutout in the direction normal to the side edge of the standing pouch are 0 mm, so the value (a+bc) of formula (1) is 10 mm.

[0154] <Evaluation of Standing Pouch> <Vapor permeability> The prepared standing pouches were microwaved for 60 seconds in a microwave oven (700W). At this time, it was visually confirmed whether the steam inside the pouch had been released from the interlayer between the base layer and the heat seal layer. Each standing pouch was microwaved three times and evaluated according to the following criteria. The results are shown in Table 1. ◎: Steam was released in all three cases. ○: Steam was released 2 out of 3 times. △: Steam was released once out of three times. ×: No steam was emitted in all three cases.

[0155] <Position where steam passes> The prepared standing pouches were microwaved for 60 seconds in a microwave oven (700W). At this time, it was visually confirmed whether steam inside the pouch was escaping from the side seal or top seal on the extension line of the half cut. Each standing pouch was microwaved three times and evaluated according to the following criteria. The results are shown in Table 1. ○: In all cases where steam was discharged, it was discharged from the side seal or the top seal on the extension line of the half cut. △: Of the times when steam was discharged, there were cases where steam was not discharged from the side seal portion or the upper seal portion on the extension line of the half cut. ×: Of the times that steam was discharged, there was no case where steam was discharged from the side seal portion or the upper seal portion on the extension line of the half cut.

[0156] [Table 1]

[0157] 《Consideration》 Examples 1, 4, and 5 show that even if the shape of the convex seal portion is an acute or obtuse angle, there is no effect on steam permeability or steam passage location, and steam can be discharged from the intended location. Also, Examples 1, 2, and 3 show that if a half cut crosses the convex seal portion, there is no effect on steam permeability or steam passage location, and steam can be discharged from the intended location. Also, Example 8 shows that even when a convex seal portion and a cutout are formed on only one side of the side seal portion, there is no effect on steam permeability or steam passage location, and steam can be discharged from the intended location.

[0158] From Examples 1 and 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.

[0159] From Example 1 and Comparative Examples 1 and 2, it is clear 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.

[0160] <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 made from the composite films, and the laminate strength was measured and the steam permeability when heated in a microwave oven was evaluated.

[0161] [material] In Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5, the following materials were prepared as materials for constituting the layers.

[0162] (1) Base material layer Ny#15: Nylon film (Bonyl (registered trademark) RX, Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm)

[0163] (2) Heat-softening 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.)

[0164] (3) Sealant layer CPP#30: Unstretched PP film (Pylen (registered trademark) P1128, Toyobo Co., Ltd., thickness: 30 μm) E1901T#50: Laminated PP film (Diffarene (registered trademark) E1901T, DIC Corporation, thickness: 50 μm)

[0165] (4) Other Release varnish: Polycoat (registered trademark) P-91 / P-91 Reducer = 3 / 1 (DIC Corporation)

[0166] Reference Examples 1 to 5, Reference Comparative Examples 1 to 4 [Manufacturing composite films] Using the materials listed in Table 2, a film serving as a base 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 heat-softening adhesive resin or adhesive was 1.5 g / m. 2 It was decided.

[0167] The film that would become the sealant layer in the laminate was cut to penetrate the sealant layer in the thickness direction (half-cut production process), and then a base layer and a heat-softenable adhesive resin layer were laminated onto the sheet containing the sealant layer to obtain a composite film with a half-cut.

[0168] Comparative Example 5 [Manufacturing composite films] Polycoat (registered trademark) P-91 / P-91 Reducer = 3 / 1 (DIC Corporation) release varnish was applied to the Ny#15 nylon film as the base layer at a coating weight of 1.5 g / m. 2 After the release varnish dried, a film to serve as a sealant layer was adhered to the release varnish-coated surface with an adhesive 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, to produce a laminate.

[0169] The film that would become the sealant layer in the laminate was cut to penetrate the sealant layer in the thickness direction (half-cut production process), and then a base layer and a heat-softenable adhesive resin layer were laminated onto the sheet containing the sealant layer to obtain a composite film with a half-cut.

[0170] <<Measurement of Laminate Strength>> The composite films obtained in Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5 were cut into 15 mm widths, and the interlaminar strength between the base layer and the sealant layer was measured in an atmosphere of 25°C and an atmosphere of 70°C. The measurements were carried out by T-peel at a rate of 300 mm / min, and the average value was calculated over a displacement range of 20 to 50 mm. The results are shown in Table 1.

[0171] [Making pillow bags] Pillow bags with inner dimensions of 130 mm x 135 mm were produced using the composite films produced in Reference Examples 1 to 5 and Reference Comparative Examples 1 to 5. A microwaveable container filled with 10 cc of water was enclosed inside the pillow bag. The half-cut was placed in the sealed portion of the pillow bag, extending from the containing portion of the pillow bag across the sealed portion. The pillow bags were produced using an impulse sealer with heating for 1.3 seconds and cooling for 2.0 seconds.

[0172] <Evaluation of steam permeability of pillow bags> The pillow pouches were microwaved for 60 seconds in a 700W microwave oven. At this time, it was visually confirmed whether steam inside the pouch had been released from the heat-sealed area. Each pillow pouch was microwaved five times and evaluated according to the following criteria. The results are shown in Table 2. ○: Steam was released in all five cases. ×: No steam was emitted in all five tests.

[0173] [Table 2]

[0174] Reference Examples 1 to 5: Measurement of adhesive strength of heat-softening adhesive resin layer The heat-softening adhesive resin or adhesive used in Reference Examples 1 to 3 and Reference Comparative Examples 2 to 3 was applied to the surface of Ny#15 nylon film (Bonyl (registered trademark) RX, Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm) in a coating amount of 1.5 g / m 2 Subsequently, a sample was cut into a width of 25 mm and attached to a test plate (stainless steel plate) to prepare an evaluation sample. When attaching, a pressure roller (2 kg) was moved back and forth twice to press the sample.

[0175] The adhesive strength of the prepared evaluation samples was measured using a Strograph in an atmosphere of 25°C. Measurements were performed at 180° peeling at 500 mm / min, and the average value was calculated over a displacement range of 20 to 50 mm. The results are shown in Table 3.

[0176] [Table 3] [Explanation of symbols]

[0177] 100 standing pouches 11 Front seat 12 Upper seal part 13 Side seal 14 Storage section 15 Cutout 16 Convex seal part 17 Steam 10 Composite Film 1 Base material layer 2 Adhesive layer 3 Sealant Layer H Half Cut F Turn line a) Width of the side seal and / or top seal with the notch in the direction normal to the side edge and / or top edge of the standing pouch b Width of the convex seal in the direction normal to the side edge and / or top edge of the standing pouch c) Width of the notch normal to the side and / or top edge of the standing pouch

Claims

1. A stand-up pouch comprising a front sheet, a back sheet, and a bottom sheet, which are heat-sealed at least at a top seal and a side seal to form a container for containing 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 sheet and the back sheet facing each other are heat-sealed via the sealant layer to form the top seal portion and the side seal portion; the side sealed portion and / or the top sealed portion has 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 slit, and a notch; the unsealed portion, the incision, and / or the notch protrude from a side edge and / or an upper edge of the standing pouch toward the storage portion of the standing pouch, the composite film has a half cut made from the sealant layer side and reaching the adhesive layer, the half cut is arranged so as to reach the unsealed portion, the slit, and / or the notch from the storage portion side of the standing pouch, the side seal portion and / or the top seal portion includes a convex seal portion that protrudes toward the storage portion side of the standing pouch on the storage portion side of the unsealed portion, the notch, and / or the cutout, the half cut is arranged so as to extend from the storage section side of the standing pouch across the convex seal section and reach the unsealed section, the incision, and / or the notch, A standing pouch that satisfies the following formula (1): a+b-c<10mm (1) (a: width of the side seal portion and / or the top seal portion having the unsealed portion, the incision, and / or the notch in a direction normal to the side edge and / or the top edge of the standing pouch, b: the width of the convex seal portion in the direction normal to the side edge and / or upper edge of the standing pouch, c: the width of the unsealed portion, the slit, and / or the notch in the direction normal to the side edge and / or the top edge of the standing pouch).

2. A stand-up pouch comprising a front sheet, a back sheet, and a bottom sheet, which are heat-sealed at least at a top seal and a side seal to form a container for containing 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 sheet and the back sheet facing each other are heat-sealed via the sealant layer to form the top seal portion and the side seal portion; the side sealed portion and / or the top sealed portion has 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 slit, and a notch; the unsealed portion, the incision, and / or the notch protrude from a side edge and / or an upper edge of the standing pouch toward the storage portion of the standing pouch, the composite film has a half cut made from the sealant layer side and reaching the adhesive layer, the half cut is arranged so as to reach the unsealed portion, the slit, and / or the notch from the storage portion side of the standing pouch, the adhesive layer is a thermosoftening resin, The laminate strength between the base layer and the sealant layer at 25°C is 1.5 N / 15 mm or more, The laminate strength between the substrate layer and the sealant layer at 70°C is less than 1.5 N / 15 mm. Standing pouch.

3. 3. The standing pouch according to claim 1, wherein the adhesive layer has an adhesive strength in accordance with JIS Z0237 of 1.0 N / 25 mm or more.

4. The standing pouch according to any one of claims 1 to 3, which is for use in a microwave oven.

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