JP2023168914A - Packaging bag for content to which adherent substance is attached and packaging product containing the same - Google Patents

Abstract

To provide a packaging bag for contents to which an adherent substance is attached and a packaging product containing the same.SOLUTION: A packaging bag for contents to which an adherent substance is attached according to the present invention is a bag-like molded body of laminated film having a base material layer and a sealant layer provided on the base material layer. A part of the sealant layer and another part thereof are in contact with each other and fused together to seal the bag-like molded body. The exposed surface of the sealant layer is the innermost surface of the bag-like molded body, and the wetting tension of the exposed surface is less than 22.6 mN/m.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging bag and a packaging product including the same, and more particularly to a packaging bag for contents to which an adhesive substance is attached and a packaging product including the same.

BACKGROUND ART Conventionally, packaging bags have been developed for many products such as foods, beverages, pharmaceuticals, and chemicals, each having functions corresponding to the contents. As one of the functions, for example, a function of suppressing the adhesion of the contents to the inner surface of the packaging bag, that is, preventing the contents from remaining inside the packaging bag, is required. In response to such demands, for example, Patent Document 1 proposes a packaging material that has a resin layer containing spherical silicon as the innermost layer and has water repellency and mold releasability for contents.

Japanese Patent Application Publication No. 8-337267

When the contents enclosed in a packaging bag formed from a packaging material such as that proposed in Patent Document 1 are foods, adhesive substances such as sugar, cream, and butter may not adhere to the packaging bag. be. In such a case, the adhesive substance may adhere not only to the contents but also to the inner surface of the packaging bag. If the contents and the packaging bag come into close contact with each other through the adhesive substance due to such adhesion, the force applied to the packaging bag will be easily transmitted to the contents, and the contents will be easily damaged.

The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to provide a packaging bag for contents to which an adhesive substance is attached, and a packaging product containing the same.

A packaging bag according to one aspect of the present invention is a bag-shaped molded product of a laminated film having a base material layer and a sealant layer provided on the base material layer, and is a packaging for contents to which an adhesive substance is attached. A bag (hereinafter sometimes simply referred to as a "packaging bag"), in which a part of the sealant layer and another part contact each other and are fused, thereby sealing the bag-like molded body. The exposed surface of the sealant layer is the innermost surface of the molded body, and the wetting tension of the exposed surface is less than 22.6 mN/m.

The innermost surface of the bag-shaped molded body, which is a packaging bag according to one aspect of the present invention, is the exposed surface of the sealant layer, and the wetting tension of the exposed surface is less than 22.6 mN/m. Therefore, even if the packaging bag contains contents to which an adhesive substance is attached, it is possible to sufficiently suppress the attachment of the adhesive substance to the exposed surface. This makes it difficult for the contents to come into close contact with the packaging bag via the adhesive substance, so that by using the packaging bag according to one aspect of the present invention, the contents are less likely to be damaged.

The sealant layer may contain Si atoms, and when the exposed surface of the sealant layer is measured by X-ray photoelectron spectroscopy, the proportion of Si atoms in all atoms may be 8% or more. By setting the proportion of Si atoms on the exposed surface to 8% or more, the wetting tension of the exposed surface of the sealant layer can be satisfactorily reduced to less than 22.6 mN/m, making it more difficult for the contents to adhere to the exposed surface. As a result, the contents are suitably less likely to be damaged.

A packaging bag according to one aspect of the present invention is a pillow packaging bag including a main body section having a cylindrical shape, and a back seal section extending along the axial direction of the main body section and protruding from the main body section. , both ends of the main body in the axial direction are sealed by a part of the sealant layer and another part, and the back seal part is sealed by the base material layer when the base material layer is expanded. A pair of end portions of the base layer in the thickness direction and a direction perpendicular to the axial direction may be a portion bonded together by a portion of the sealant layer and another portion.

A packaging product according to one aspect of the present invention includes the packaging bag described above, and a food product that is the content enclosed in the packaging bag and has a glaze, which is an adhesive substance, attached thereto. The innermost surface of the bag-shaped molded body, which is a packaging bag in the packaging product, is the exposed surface of the sealant layer having a wetting tension of less than 22.6 mN/m. Therefore, the glaze and food are less likely to adhere to the packaging bag, and as a result, damage to the contents can be suppressed.

The ratio of the volume of the food product based on the volume of the packaging bag may be 70% by volume or more and 90% by volume or less. Generally, the larger the ratio of the volume of the contents to the volume of the packaging bag, the more likely it is that the contents will come into close contact with the packaging bag, and as a result, the food inside the packaging bag will be more likely to be damaged. On the other hand, according to the above-mentioned packaging product, even if the above-mentioned ratio is 70% by volume or more, the contents and the packaging bag are unlikely to come into close contact with each other, and therefore damage to the contents can be well suppressed. Further, when the above ratio is 90% by volume or less, movement of the food within the packaging bag becomes sufficiently possible.

According to one aspect of the present invention, it is possible to provide a packaging bag for contents to which an adhesive substance is attached, and a packaging product including the same.

FIG. 1 is a schematic plan view of a packaging bag 1. FIG. FIG. 2 is a plan view of the laminated film 2 obtained by developing the packaging bag 1. FIG. 3 is a schematic cross-sectional view of the laminated film 2. FIG. 4 is a schematic plan view of a packaging bag 1A according to a modification. FIG. 5 is a schematic diagram showing how the glaze adheres to the packaging bag. FIG. 6 is a bar graph showing the degree of glaze adhesion after the actual transportation process in Example 1 and Comparative Example 1. FIG. 7 is a bar graph showing the degree of glaze adhesion before the heating storage step in Example 1 and Comparative Example 1. FIG. 8 is a bar graph showing the degree of glaze adhesion after the heating storage step in Example 1 and Comparative Example 1. FIG. 9 is a bar graph showing the amount of glaze deposited after the heating storage step in Example 1 and Comparative Example 1.

Hereinafter, preferred embodiments of one aspect of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same elements or elements having the same function will be denoted by the same reference numerals, and redundant description will be omitted. Furthermore, the dimensional ratios in the drawings are not limited to the ratios shown.

<Packaging bag for contents to which adhesive substances are attached>
The packaging bag according to this embodiment will be described in detail with reference to FIGS. 1 and 2. FIG. 1 is a schematic plan view of a packaging bag 1 (also referred to as "packaging bag 1" in this specification). FIG. 2 is a plan view of the laminated film 2 obtained by developing the packaging bag 1. The packaging bag 1 is a pillow packaging bag that is a bag-shaped molded product of a laminated film 2 (details will be described later), and is used, for example, to enclose contents to which an adhesive substance (details will be described later) is attached. The pillow packaging bag can be formed using, for example, a known pillow packaging and filling machine. After bending the laminated film 2 so that the sealant layer 24 (see FIG. 3) contained in the laminated film 2 is located at the innermost position using the packaging and filling machine described above, a part of the sealant layer 24 and the other parts are bent. The packaging bag 1, which is a bag-shaped molded body (here, a pillow packaging bag), is formed by contacting and fusing the parts with each other. As a result, in the bag-shaped molded body that is the packaging bag 1, the exposed surface of the sealant layer 24 is the innermost surface. The packaging bag 1 has a main body portion 11 having a cylindrical shape and a back seal portion 12. Hereinafter, the axial direction of the main body portion 11 will be referred to as the direction X shown in FIG. 1, and the direction perpendicular to the direction X in a plane will be referred to as the direction Y. The direction Y corresponds to the direction perpendicular to the thickness direction of the base material layer 21 and the direction X when the base material layer 21 is developed as shown in FIG.

The main body portion 11 is a portion in which the contents of the packaging bag 1 are accommodated. The main body portion 11 has a rectangular shape when viewed from a predetermined direction. At least a portion of the outer surface of the main body portion 11 may be printed. For example, in addition to the contents, the main body portion 11 may contain a specific gas such as nitrogen or air. The main body portion 11 is formed by rolling the laminated film 2 along the direction Y. Both ends 13 of the laminated film 2 adjacent to the main body portion 11 in the direction X are sealed with a sealant layer 24 . Both ends 13 are formed, for example, by heating and compressing (that is, heat-sealing) a part of the sealant layer 24 and another part of the laminated film 2, but the invention is not limited thereto. For example, both ends 13 may be formed by cold sealing or the like. From the viewpoint of accommodating contents, the dimension of the main body part 11 along the direction X is, for example, 80% or more of the dimension of the base material layer 21 along the direction X. From the viewpoint of sealability of both ends 13, the dimension of the main body part 11 along the direction X is, for example, 90% or less of the dimension of the base material layer 21 along the direction X. In order to easily tear the packaging bag 1, a notch may be provided at both ends 13, only one of the ends 13, or the back seal portion 12.

The back seal part 12 is a part provided when the packaging bag 1 is formed, and extends along the direction X and protrudes from the main body part 11. The back seal portion 12 extends from one end of the packaging bag 1 in the direction X to the other end. The back seal portion 12 corresponds to a portion where a pair of end portions 21c and 21d of the base layer 21 in the direction Y when the base layer 21 is expanded are bonded together by the sealant layer 24 (see FIG. 2). Similar to both ends 13, the back seal portion 12 may be formed, for example, by heat sealing or cold sealing a part of the laminated film 2 and another part. When the base material layer 21 is developed, the dimension of the back seal portion 12 along the direction Y is, for example, 1% or more and 5% or less of the dimension of the base material layer 21 along the direction Y. In this case, the back seal portion 12 can be bonded together satisfactorily while ensuring the volume of the packaging bag 1.

The contents include solid contents, especially solid foods. Solid foods include cookies, biscuits, chocolate, candy, and the like. At least the solid foods exemplified herein have a degree of brittleness that can be chewed with teeth. That is, it can be said that these solid foods are easily damaged (broken or cracked) by external forces inside the packaging bag.

Examples of the adhesive substance include foods that melt at 30° C. or higher and 40° C. or lower, foods that have adhesive properties at room temperature, and the like. More specifically, the adhesive substances include sugar such as caster sugar, brown sugar, cane sugar, granulated sugar, and powdered sugar; fat and oil components such as butter and margarine; meringue; chocolate; sugar, fat and oil components, meringue and chocolate. A mixture of any two or more of them is exemplified. A mixture of sugar and fat components (eg, a mixture of grits and butter) is referred to herein as a "glaze."

The adhesive substance may be attached to the entire surface of the content, or may be attached only to a part of the surface. For example, 10% or more, 25% or more, or 40% or more of the surface area of the contents may be covered with the adhesive substance, and 90% or less, 75% or less, or 60% or less may be covered with the adhesive substance. .

<Packaged products>
In this specification, a packaging product (not shown) is an embodiment in which the above-mentioned contents are enclosed in the packaging bag 1. From the viewpoint of ease of movement of the contents within the packaging bag 1, in the above packaging product, the volume ratio of the contents is, for example, 90% by volume or less, based on the volume of the packaging bag. The proportion is preferably 85% by volume or less, more preferably 80% by volume or less. From the viewpoint of a product, the above ratio may be, for example, 70 volume % or more, or 75 volume % or more.

<Laminated film>
The laminated film 2 will be explained in detail with reference to FIG. 3. FIG. 3 is a schematic cross-sectional view of the laminated film 2. The laminated film 2 is a packaging sheet (packaging material) used to form the packaging bag 1 shown in FIG. 1, the packaging bag 1A shown in FIG. 4, etc. The laminated film 2 can have required properties (for example, gas barrier properties, light shielding properties, water resistance, temperature and humidity resistance, mechanical strength, printability, printability, decoration ease, etc.). Note that gas barrier property means the ability to prevent or suppress the permeation of gases such as oxygen and water vapor (air permeation prevention property). Water resistance is evaluated by the strength reduction rate when the packaging bag 1 etc. gets wet. The laminated film 2 includes a base material layer 21, an adhesive layer 22, a gas barrier layer 23, and a sealant layer 24. The base material layer 21, the adhesive layer 22, the gas barrier layer 23, and the sealant layer 24 overlap in this order in the thickness direction (hereinafter also simply referred to as "thickness direction") of the base material layer 21.

In FIG. 3, the base material layer 21 has a sheet-like shape and has main surfaces 21a and 21b. The main surfaces 21a and 21b are surfaces that intersect with the thickness direction of the base material layer 21. When the packaging bag 1 is formed from the laminated film 2, the main surface 21a is one surface located on the outside of the packaging bag 1, and the main surface 21b is the other surface located on the inside of the packaging bag 1. The main surface 21a is an exposed surface of the packaging bag 1.

The material of the base layer 21 is not particularly limited as long as it serves as a support, and examples thereof include paper, resin film, metal foil, and the like. Examples of the paper include high quality paper, special high quality paper, coated paper, art paper, cast coated paper, imitation paper, and kraft paper. Examples of resin films include polyolefins (for example, polyethylene (PE), polypropylene (PP), etc.), acid-modified polyolefins, polyesters (for example, polyethylene terephthalate (PET), etc.), polyamide (PA), polyvinyl chloride (PVC), cellulose acetate, Examples include films containing at least one type of cellophane resin. This film may be a stretched film or a non-stretched film. Examples of the metal foil include aluminum foil, nickel foil, and the like. The base material layer 21 may be formed by laminating a plurality of base materials made of different materials.

The thickness of the base material layer 21 is not particularly limited and can be adjusted as appropriate depending on the application, but is usually 1 to 500 μm, preferably 10 to 100 μm.

In FIG. 3, the adhesive layer 22 is a layer that adheres the base material layer 21 and the gas barrier layer 23.

Examples of the adhesive used in the adhesive layer 22 include polyurethane resins in which a bifunctional or more functional isocyanate compound is applied to a base material such as polyester polyol, polyether polyol, acrylic polyol, or carbonate polyol. The various polyols mentioned above can be used alone or in combination of two or more.

The adhesive layer 22 may further contain a carbodiimide compound, an oxazoline compound, an epoxy compound, a phosphorus compound, a silane coupling agent, etc. in addition to the above-mentioned polyurethane resin for the purpose of promoting adhesion.

Further, depending on the performance required of the adhesive layer 22, various other additives and stabilizers may be added to the above-mentioned polyurethane resin.

The thickness of the adhesive layer 22 is not particularly limited, but from the viewpoint of obtaining desired adhesive strength, trackability, processability, etc., it is preferably, for example, 1 to 10 μm, and more preferably 3 to 7 μm.

In FIG. 3, the gas barrier layer 23 is a layer that covers a main surface 24a of a sealant layer 24, which will be described later. In FIG. 3, the gas barrier layer 23 covers the entire main surface 24a, but may cover only a part of it.

Gas barrier layer 23 may contain thermoplastic resin. It is preferable that the gas barrier layer 23 contains a thermoplastic resin having heat sealability. The thermoplastic resin used for the gas barrier layer 23 includes polyolefin resin, ethylene-α,β unsaturated carboxylic acid copolymer or its esterified product or ionic crosslinked product, ethylene-vinyl acetate copolymer or its saponified product, polyacetic acid. Examples include vinyl or saponified products thereof, polycarbonate resins, thermoplastic polyester resins, ABS resins, polyacetal resins, polyamide resins, polyphenylene oxide resins, polyimide resins, polyurethane resins, polylactic acid resins, furan resins, and silicone resins. These thermoplastic resins can be used alone or in combination of two or more.

The thermoplastic resin used for the gas barrier layer 23 preferably contains a polyolefin resin because heat sealability, heat resistance, and impact resistance are likely to be improved. As the polyolefin resin, the same polyolefin resin as used for the sealant layer 24 described later can be used.

The thickness of the gas barrier layer 23 can be, for example, 0.1 to 300 μm, preferably 1 to 200 μm, more preferably 5 to 150 μm, and even more preferably 10 to 100 μm.

The gas barrier layer 23 can not only provide the laminated film 2 with barrier properties against oxygen or water vapor, but also provide heat resistance, impact resistance, heat sealability, and the like.

The sealant layer 24 is used to attach one part of the laminated film 2 to another part, and is located on the main surface 21b of the base layer 21 in the thickness direction. Further, when the packaging bag 1 is formed from the laminated film 2, the sealant layer 24 is located inside the base layer 21. In this embodiment, the sealant layer 24 covers the entire main surface 21b via the adhesive layer 22 and the gas barrier layer 23, but is not limited thereto.

The main surface 24a of the sealant layer 24 is the main surface (one surface) in contact with the gas barrier layer 23, and the other main surface 24b is a surface exposed from the base material layer 21 etc. (exposed surface). The main surface 24b becomes the innermost surface when the packaging bag 1 is manufactured.

The resin composition for forming the sealant layer (hereinafter also referred to as "resin composition for forming a sealant layer") includes a polyolefin resin, a silylated polyolefin, a portion compatible with the polyolefin resin, and a portion compatible with the silylated polyolefin. The silylated polyolefin may contain a compatibilizing agent having a compatible site (hereinafter also simply referred to as a "compatibilizing agent"), and the polyolefin site of the silylated polyolefin may be incompatible with the polyolefin resin. .

The resin composition for forming a sealant layer may contain a polyolefin resin and a silylated polyolefin without containing a compatibilizer, and even if the polyolefin portion of the silylated polyolefin is compatible with the polyolefin resin. good.

That is, when the polyolefin portion of the silylated polyolefin is incompatible with the polyolefin resin, the resin composition for forming a sealant layer may contain a compatibilizer as an essential component; If it is compatible with the polyolefin resin, it may not require a compatibilizing agent. Moreover, the resin composition for forming a sealant layer may further contain silicone. Each component will be explained in detail below.

(Polyolefin resin)
The polyolefin resin is not particularly limited, and examples thereof include low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-α olefin copolymer, homo, block, or random polypropylene, propylene-α olefin copolymer, etc. . Examples of the α-olefin component include ethylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, and 4-methyl-1-pentene. The copolymer may be a random copolymer or a block copolymer. In addition to the above, the polyolefin resin may also be a cyclic polyolefin such as polynorbornene. Further, from the viewpoint of sealing properties and strength properties (tensile strength, impact strength, etc.), the polyolefin resin is preferably a linear polyolefin, and the linear polyolefin may be linear or branched.

Examples of the polypropylene resin include homopolypropylene, block polypropylene, random polypropylene, and copolymers of propylene and α-olefins other than ethylene and propylene (propylene copolymers) as described above. Among these, it is preferable that the polypropylene resin contains random polypropylene. By including random polypropylene, it becomes easier to prevent the bag-shaped packaging material from breaking due to heat, and it also tends to facilitate heat sealing at low temperatures and in a short time.

The melting point of the polyolefin resin can be adjusted as appropriate depending on the final use. For example, when used as a retort food packaging material, the melting point of the polyolefin resin is preferably 130 to 170°C.

The polyolefin resin may be a modified polyolefin modified with a predetermined acid. The modified polyolefin is obtained by graft-modifying a polyolefin with an unsaturated carboxylic acid derivative component derived from, for example, an unsaturated carboxylic acid, an acid anhydride of an unsaturated carboxylic acid, an ester of an unsaturated carboxylic acid, or the like. Furthermore, modified polyolefins such as hydroxyl-modified polyolefins and acrylic-modified polyolefins can also be used as the polyolefin resin.

The above-mentioned polyolefin resins can be used alone or in combination of two or more.

(silylated polyolefin)
The silylated polyolefin is a component that imparts liquid repellency to the sealant layer 24. A silylated polyolefin is a polyolefin unit with a silicone moiety.

Examples of silylated polyolefins include PE-Si graft copolymers manufactured by Dow Corning Toray Co., Ltd., PE-Si block copolymers such as Xfora manufactured by Mitsui Chemicals Fine Co., Ltd., and PP-Si graft copolymers. Examples of combined products include products manufactured by Toray and Dow Corning Co., Ltd.

As the silylated polyolefin, a block copolymer is more preferable than a graft copolymer from the viewpoint of further improving the liquid repellency of the sealant layer 24. This is because block copolymers tend to be unevenly distributed or bleed out on the surface of the sealant layer 24.

The above-mentioned silylated polyolefins can be used alone or in combination of two or more.

The silylated polyolefin may have a polyolefin moiety that is compatible with the polyolefin resin, or may be incompatible with the polyolefin resin. However, when using a silylated polyolefin whose polyolefin moiety is incompatible with the polyolefin resin described above, it is preferable to use it in combination with the following compatibilizing agent. In addition, when using a silylated polyolefin whose polyolefin moiety is incompatible with a polyolefin resin, it is necessary to use a compatibilizer together, but there are more options for combinations of polyolefin resin and silylated polyolefin materials, and the purpose and application It has the advantage that it is possible to design according to the situation, and that it tends to improve liquid repellency more easily.

(Compatibilizer)
A compatibilizing agent may be used when a silylated polyolefin whose polyolefin moiety is incompatible with the polyolefin resin is used as the silylated polyolefin. The compatibilizing agent is a component having a site that is compatible with the polyolefin resin and a site that is compatible with the silylated polyolefin. By using a compatibilizing agent, it is possible to improve the compatibility between the silylated polyolefin whose polyolefin moiety is incompatible with the polyolefin resin and the polyolefin resin.

Examples of the site that is compatible with the polyolefin resin include a polyolefin structure that is compatible with the polyolefin resin, and preferably a site that has the same type of polyolefin structure as the polyolefin resin. That is, when the polyolefin resin is a polyethylene resin, the compatibilizer preferably has a polyethylene structure, and when the polyolefin resin is a polypropylene resin, the compatibilizer preferably has a polypropylene structure. In addition, when the polyolefin resin is a copolymer consisting of two or more olefins such as an ethylene-α-olefin copolymer or a propylene-α-olefin copolymer, the compatibilizer is a copolymer of two or more olefins constituting the copolymer. Among them, it is preferable to have at least a structure obtained by polymerizing or copolymerizing an olefin of the same type as the olefin serving as the main component.

Examples of the site that is compatible with the silylated polyolefin include a polyolefin structure that is compatible with the polyolefin site of the silylated polyolefin, and preferably a site that has the same type of polyolefin structure as the polyolefin site of the silylated polyolefin. That is, when the polyolefin part of the silylated polyolefin has a polyethylene structure, the compatibilizer preferably has a polyethylene structure, and when the polyolefin part of the silylated polyolefin has a polypropylene structure, the compatibilizer preferably has a polypropylene structure. preferable. In addition, when the polyolefin moiety of the silylated polyolefin has a structure based on a copolymer consisting of two or more olefins, such as an ethylene-α-olefin copolymer or a propylene-α-olefin copolymer, the compatibilizer is It is preferable that the copolymer has at least a structure obtained by polymerizing or copolymerizing an olefin of the same type as the olefin that is the main component among the olefins constituting the copolymer.

As the compatibilizer, for example, a block copolymer of ethylene and propylene or a block copolymer of ethylene and an ethylene-butylene copolymer can be used. In this case, if the polyolefin part of the polyolefin resin or silylated polyolefin is polyethylene, the part is compatible with the polyethylene part of the compatibilizer, and if the polyolefin part of the polyolefin resin or silylated polyolefin is polypropylene, the part is compatible with the polyethylene part of the compatibilizer. and the propylene or ethylene-butylene copolymer portion of the compatibilizer are compatible.

The above-mentioned compatibilizers can be used alone or in combination of two or more.

(silicone)
Silicone is a component that further improves the liquid repellency of the sealant layer 24. Examples of the silicone include silicone oil, silicone resin, silicone oligomer, and silicone powder. Among these, silicone oil is preferred because better liquid repellency is easily obtained.

Examples of the silicone oil include dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, cyclic dimethyl silicone oil, alkyl-modified silicone oil, long-chain alkyl-modified silicone oil, and higher fatty acid-modified silicone oil.

Examples of the silicone oil include products manufactured by Asahi Kasei Wacker Silicone Co., Ltd., products manufactured by Shin-Etsu Chemical Co., Ltd., products manufactured by Momentive Performance Materials, Inc., and products manufactured by Toray Dow Corning Co., Ltd., and the like.

Examples of the silicone resin include products manufactured by Shin-Etsu Chemical Co., Ltd. and products manufactured by Asahi Kasei Wacker Silicone Co., Ltd.

Examples of silicone oligomers include products manufactured by Shin-Etsu Chemical Co., Ltd. and products manufactured by Dow Corning Toray Industries, Inc., and the like.

Examples of the silicone powder include products manufactured by Shin-Etsu Chemical Co., Ltd. and products manufactured by Dow Corning Toray Co., Ltd., and the like.

The silicones mentioned above can be used alone or in combination of two or more.

The content of the polyolefin resin in the resin composition for forming a sealant layer is preferably 50.0 to 99.9% by mass, and 55.0 to 99% by mass, based on the total solid content of the resin composition for forming a sealant layer. The content is more preferably .0% by mass, and even more preferably 60.0 to 98.0% by mass. When the content of the polyolefin resin is at least the above lower limit, good heat sealability tends to be easily obtained. On the other hand, when the content of the polyolefin resin is below the above upper limit value, the content of the silylated polyolefin and the compatibilizer increases relatively, so that the liquid repellency tends to be easily improved.

The total content of the silylated polyolefin and the compatibilizer in the resin composition for forming a sealant layer may be 0.1 to 50.0% by mass based on the total solid content of the resin composition for forming a sealant layer. It is preferably 1.0 to 45.0% by mass, more preferably 2.0 to 40.0% by mass. When the total content of the silylated polyolefin and the compatibilizing agent is at least the above lower limit, the liquid repellency tends to be improved. On the other hand, when the total content of the silylated polyolefin and the compatibilizing agent is below the above upper limit, the content of the polyolefin resin increases relatively, so that good heat sealability tends to be easily obtained.

When the resin composition for forming a sealant layer contains a compatibilizer, the mass ratio of the content of the compatibilizer to the content of the silylated polyolefin (mass of the compatibilizer/mass of the silylated polyolefin) is 0.01 to It may be 50, preferably 0.05 to 30, more preferably 0.05 to 20. When this content ratio is at least the above lower limit, the silylated polyolefin can be sufficiently dispersed in the sealant layer, and there is a tendency that better liquid repellency can be obtained. On the other hand, when this content ratio is below the above upper limit value, it is possible to prevent the silylated polyolefin from being coated with an excessive compatibilizing agent and tend to be able to obtain better liquid repellency. Furthermore, even if the compatibilizing agent is added so that the content ratio exceeds the above upper limit, the silylated polyolefin will not be dispersed any more, and the effect of improving liquid repellency will tend to be lost.

The resin composition for forming a sealant layer may contain other additives as necessary within a range that does not impair liquid repellency. Examples of other additives include flame retardants, slip agents, antiblocking agents, antioxidants, light stabilizers, and tackifiers.

The sealant layer 24 can be formed by forming a film from the resin composition for forming a sealant layer.

The thickness of the sealant layer 24 is preferably 0.1 to 100 μm, more preferably 1 to 70 μm, even more preferably 3 to 50 μm, and particularly preferably 5 to 30 μm. When the thickness of the sealant layer 24 is equal to or greater than the above lower limit, good liquid repellency and heat sealability tend to be easily obtained. On the other hand, when the thickness is equal to or less than the above upper limit, the thickness of the entire laminated film 2 can be made thin.

The wetting tension of the main surface 24b is less than 22.6 mN/m. The wetting tension of the main surface 24b may be less than 22.4 mN/m, preferably less than 22.2 mN/m, more preferably less than 22.0 mN/m, and even more preferably less than 21.8 mN/m. The wetting tension of the main surface 24b can be measured, for example, by the method described in Examples. The magnitude of the wetting tension on the main surface 24b can be adjusted by, for example, changing the type of resin contained in the sealant layer 24, the amount of Si on the main surface 24b, and the like. More specifically, for example, if the sealant layer 24 contains a fluororesin or if the amount of Si on the main surface 24b is increased, the magnitude of the wetting tension on the main surface 24b becomes smaller.

The main surface 24b of the sealant layer 24 has the above-mentioned wetting tension and therefore has excellent liquid repellency. Liquid repellency is a concept that includes at least oil repellency, and specifically, it is a property of repelling at least liquid, semisolid, or gel-like oil-based materials. Further, the sealant layer 24 is a layer that can exhibit heat-sealing properties by heating. Heat-sealability refers to the property that heat sealing is possible under conditions of 100 to 200°C, 0.1 to 0.3 MPa, and 1 to 3 seconds, as an example. The heat sealing conditions can be easily changed depending on the conditions required for heat sealing the laminated film 2.

When the gas barrier layer 23 is in contact with the sealant layer 24, the melting point T1 (°C) of the polyolefin resin in the sealant layer 24 and the melting point T2 (°C) of the thermoplastic resin in the gas barrier layer 23 are such that T1<T2. It is preferable to satisfy the relationship. By satisfying the above relationship, it is possible to suppress the silylated polyolefin in the sealant layer 24 from migrating to the gas barrier layer 23 from the viewpoint of crystallinity, and prevent uneven distribution or bleed-out of the silylated polyolefin on the surface of the sealant layer 24. Since efficiency can be improved, there is a tendency that liquid repellency can be further improved. From the same viewpoint, the melting point T2 is preferably 1° C. or more higher than the melting point T1, and more preferably 3° C. or more higher.

<Method for manufacturing packaging bags>
An example of a method for manufacturing the packaging bag 1 using the laminated film 2 will be described below. In the first step, a polyolefin resin, a silylated polyolefin, and a compatibilizer are mixed to obtain a resin composition for forming a sealant layer. In the second step, a resin composition for forming a gas barrier layer is prepared. The first step may be performed before or after the second step. The first step and the second step may be performed in parallel.

In the third step, the sealant layer forming resin composition and the gas barrier layer forming resin composition obtained in the first and second steps are coextruded using a coextruder. Through the third step, a laminated film in which the gas barrier layer 23 and the sealant layer 24 are laminated is obtained. Examples of the coextruder include cast film equipment, blown film equipment, and the like.

In the fourth step, the gas barrier layer 23 of the laminated film obtained in the third step and the base layer 21 are bonded together using an adhesive. Through the fourth step, a laminated film 2 is obtained. The gas barrier layer 23 and the base material layer 21 may be bonded together using a lamination method using heat treatment. Lamination methods using heat treatment include the following methods.
(1) A method in which an adhesive resin is extruded between the laminated film obtained in the third step and the base layer 21 and laminated.
(2) A method in which the resin constituting the laminated film obtained in the third step and the adhesive resin are co-extruded and laminated with the base layer 21.
(3) A method of adhering the laminate base material obtained by the method (1) or (2) above by further heating and/or pressing with a hot roll.
(4) A method in which the laminate base material obtained by the method (1) or (2) above is further stored in a high-temperature atmosphere or passed through a drying and baking oven in a high-temperature atmosphere.

In the fifth step, the thus obtained laminated film 2 is bent and a part of the sealant layer 24 and another part are adhered to form a pillow-shaped packaging bag 1. More specifically, in the fifth step, first, the laminated film 2 is bent so that the sealant layer 24 is located on the inside. Next, a part of the sealant layer 24 and another part are adhered to form a cylindrical body having the back seal part 12. Furthermore, the packaging bag 1, which is a pillow packaging bag, is formed by bonding the parts of the sealant layer 24 located at both axial ends of the cylindrical body.

According to the packaging bag 1 according to the present embodiment described above, the innermost surface of the packaging bag 1 that can come into contact with the contents is the main surface 24b of the sealant layer 24, and the wetting tension of the main surface 24b is 22.6 mN. /m. Therefore, even if the packaging bag 1 is filled with contents to which an adhesive substance is attached, the attachment of the adhesive substance to the main surface 24b can be sufficiently suppressed. This makes it difficult for the contents to come into close contact with the packaging bag 1 via the adhesive substance. Thereby, when a force is applied to the packaging bag 1 from the outside, the force is difficult to be transmitted to the food. Therefore, by using the packaging bag 1, the contents are less likely to be damaged.

In this embodiment, the sealant layer 24 contains Si atoms, and when the main surface 24b of the sealant layer 24 is measured by X-ray photoelectron spectroscopy, the proportion of Si atoms in all atoms is 8% or more. Therefore, the wetting tension of the main surface 24b of the sealant layer 24 can be satisfactorily reduced to less than 22.6 mN/m, making it more difficult for the contents to adhere to the main surface 24b. As a result, damage to the contents becomes less likely to occur.

In this embodiment, the packaged product includes a packaging bag 1 and a food that is the content enclosed in the packaging bag 1 and has a glaze, which is an adhesive substance, attached thereto. The innermost surface of the bag-shaped molded body, which is the packaging bag 1 in this packaging product, is the exposed surface of the sealant layer 24 having a wetting tension of less than 22.6 mN/m. Therefore, adhesion of the glaze and food to the packaging bag 1 is less likely to occur, and therefore, close contact between the food and the packaging bag 1 via the glaze is less likely to occur. As a result, damage to the food can be suppressed. For example, when the packaging bag 1 itself or the box in which the packaging bag 1 is stored is transported, vibrations associated with the transport are applied to the packaging bag 1. In this case, as described above, since the food product is unlikely to come into close contact with the packaging bag 1, as the food product moves within the packaging bag 1, the force caused by the vibration can be dispersed. Furthermore, even if the packaging bag 1 containing the food is stored at a relatively high temperature (higher than the standard temperature (20°C), for example about 30°C to 50°C), the glaze and/or the surface of the food may melt. Note that these tend to be difficult to adhere to the packaging bag 1.

In the present embodiment, in the packaged product, the volume ratio of the food product based on the volume of the packaging bag 1 is 70% by volume or more and 90% by volume or less. Generally, the larger the proportion of the volume of the contents based on the volume of the packaging bag 1, the more likely it is that the contents will come into close contact with the packaging bag 1, and as a result, the food inside the packaging bag 1 will be more likely to be damaged. . On the other hand, according to the above packaging product, even if the above ratio is 70% by volume or more, the food and the packaging bag 1 are unlikely to come into close contact with each other. As described above, this makes it difficult for the food to be damaged, and since the ratio is 90% by volume or less, the food can move within the packaging bag 1. Note that even when the above ratio is less than 70% by volume, the effect of suppressing food damage can naturally be obtained.

<Modified example>
Hereinafter, a packaging bag 1A according to a modification will be described with reference to FIG. 4. Therefore, in the following, parts that are different from the above embodiment will be mainly explained. FIG. 4 is a schematic plan view of the packaging bag 1A. The packaging bag 1A shown in FIG. 4 is composed of a laminated film 2 (see FIG. 3) similarly to the packaging bag 1 of the above embodiment (see FIG. 1). The packaging bag 1A is formed into a bag shape by, for example, sealing the ends of the laminated film 2 which is folded in two so as to sandwich the contents therebetween.

The packaging bag 1A has a main body part 14 in which the contents are stored, a seal part 15 located at the end of the main body part 14, and a bent part 16 where the laminated film 2 is bent. The shape of the main body portion 14 is not particularly limited, and may have a rectangular shape when viewed from a predetermined direction, for example. At least a portion of the outer surface of the main body portion 14 may be printed. For example, the main body portion 14 may contain a specific gas such as nitrogen in addition to the contents. The seal portion 15 is a portion where a portion of the sealant layer 24 of the laminated film 2 and another portion are bonded together. In the seal portion 15, a part of the sealant layer 24 of the laminated film 2 and another part are in close contact with each other. The seal portion 15 is formed, for example, by heating and compressing (that is, heat-sealing) a part of the sealant layer 24 and another part of the laminated film 2, but is not limited thereto. For example, the seal portion 15 may be formed by cold sealing or the like. In the packaging bag 1A, the bent portion 16 constitutes one side of the main body portion 14, and the seal portion 15 constitutes the remaining three sides of the main body portion 14. Both ends of the bent portion 16 and the seal portion 15 overlap.

The packaging bag for contents to which an adhesive substance is attached and the packaging product including the same according to one aspect of the present invention are not limited to the above-described embodiment and the above-described modification. For example, the packaging bags according to the above embodiments and the above modifications are mainly intended for storing solid contents, such as food whose surface is coated with glaze, but are prohibited from storing liquids or gases at all. It doesn't mean you can't do it. Solid contents include the foods mentioned above. Furthermore, the packaging bag may contain one content (that is, the packaged product according to an embodiment of the present invention may be individually wrapped) or may contain a plurality of contents.

In this embodiment and the above modification, the laminated film includes a base material layer, an adhesive layer, a gas barrier layer, and a sealant layer, but is not limited thereto. For example, the laminated film may not include an adhesive layer and/or a gas barrier layer. The laminated film may further include, for example, ink, an overcoat layer, and the like. Moreover, the laminated film may be provided with ink. In this case, the ink can be formed, for example, on one surface of the base layer (on the main surface 21a shown in FIG. 3). In this case, ink may be applied after providing a coating layer made of resin or the like on the one surface. Ink can be used to form designs on laminated films. From the viewpoint of printability, cost, etc., the thickness of the ink may be, for example, 0.1 μm or more and 2 μm or less. The ink may be attached to the entire one surface, or may be attached only to a part of the one surface. The ink is, for example, a portion printed with water-based or oil-based ink. The ink may be formed by mixing multiple inks or by overlapping multiple inks. At least a portion of the ink contained in the ink may soak into the coat layer or the one surface.

When the laminated film includes an overcoat layer, the overcoat layer may be located on the outermost surface of the packaging bag. In this case, the overcoat layer can protect the base layer (or the coat layer if the laminated film includes a coat layer) and the ink if the laminated film includes ink. The overcoat layer may contain, for example, a paint such as varnish, an ultraviolet curing resin, a thermoplastic resin, and the like. From the viewpoint of design and moldability, the thickness of the overcoat layer may be, for example, 0.1 μm or more and 5 μm or less, or 1 μm or more and 3 μm or less.

EXAMPLES Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Example 1]
<Preparation of resin composition for sealant layer formation>
Propylene-ethylene random copolymer (trade name "Prime Polypro", manufactured by Prime Polymer Co., Ltd.) and silylated polyethylene (PE-Si-PE triblock copolymer (trade name "Exphora", manufactured by Mitsui Chemicals Fine Co., Ltd.) A resin composition for forming a sealant layer was prepared by mixing a block copolymer of PP-PE and a block copolymer of PP-PE.The content of each component was as follows: propylene-ethylene random copolymer, silylated polyethylene, and PP-PE Based on the total amount of PE block copolymer, propylene-ethylene random copolymer is 94.9% by mass, silylated polyethylene is 5% by mass, and PP-PE block copolymer is 0.1% by mass. I adjusted it as follows.

<Production of laminated film for packaging bags>
Using a film casting device, the resin composition for forming a sealant layer was extruded to form a film, and a sealant film consisting of a sealant layer with a thickness of 40 μm was obtained. The obtained sealant film and a 12 μm thick PET film (trade name “GL-AE”, manufactured by Toppan Printing Co., Ltd.) as a base material were dried using a polyurethane adhesive (manufactured by Mitsui Chemicals, Inc.). It was laminated and aged at 50° C. for 5 days to obtain a laminated film for packaging bags. The wetting tension and the amount of surface Si on the surface of the sealant layer of the obtained laminated film for packaging bags, which is opposite to the base material (the exposed surface of the sealant layer), were measured. The sealant layer was not wetted even when a wetting test liquid with a surface tension of 22.6 mN/m (trade name "Wetting tension test mixture No. 22.6", Fujifilm Wako Pure Chemical Industries, Ltd.) was applied. The wetting tension on the exposed surface of the sealant layer of the laminated film for packaging bags was less than 22.6 mN/m. The surface Si content was 8.8%. The surface Si amount refers to the proportion of Si atoms in all atoms measured by X-ray Photoelectron Spectroscopy (XPS).

<How to measure wetting tension>
Wetting tension (surface wetting tension) was measured based on JISK6768:1999. Specifically, first, several drops of a wettability test liquid having a known surface tension were placed on the sealant layer of the laminated film for packaging bags. By changing the types of wetting test liquids, we identified a wetting test liquid that caused droplets to spread over the surface of the sealant layer without being repelled. The surface tension of the specified wetting test liquid was defined as the surface wetting tension.

<XPS conditions>
The measurement conditions for X-ray photoelectron spectroscopy were as follows.
・X-ray source: MgKα
・X-ray output: 100W

<Production of pillow packaging bag>
The obtained laminated film for packaging bags (length of one side was 196 mm) was bent so that the sealant layer was located on the inside, and both ends were overlapped by about 15 mm and heat-sealed. As a result, a cylindrical body with a back seal (seal width: approximately 15 mm) was obtained. When the obtained cylindrical body is crushed into a flat shape so that two sides parallel to the axial direction are formed, the width in the direction perpendicular to the axial direction is about 82.7 mm. Next, one end of the obtained cylindrical body was heat-sealed (sealing width in the axial direction of the cylindrical body: approximately 10 mm), one content was placed, and a space of approximately 88.5 mm was placed from the heat-sealed end. It was opened and heat sealed (seal width: approximately 20 mm). The contents are cookies (the axial length of the cylindrical body is approximately 82 mm, the length in the direction orthogonal to the axial direction of the cylindrical body is approximately 80 mm, and the glaze (clarified butter and sugar) is coated on one side. 5 mm). Inserting one content and heat sealing once with a sealing width of about 20 mm at intervals of about 88.5 mm along the axial direction of the cylindrical body were repeated. A heat-sealed portion with a seal width of about 20 mm was cut at the center. As a result of the above, a packaging product was obtained that included a pillow packaging bag in which a back seal with a width of about 15 mm, an end seal with a width of about 10 mm, and a top seal with a width of about 10 mm were formed, and the contents. The above operations were performed using a vertical pillow bag making machine ("INSPIRA", manufactured by Ishida Co., Ltd.). The heat sealing was performed under the conditions of 180° C., 0.2 MPa, and 0.5 sec. 160 packaging products were produced.

[Example 2]
A laminated film for packaging bags was obtained in the same manner as in Example 1, except that a sealant film was obtained using a three-layer coextrusion blown film forming machine instead of the film casting device. The wetting tension and surface Si amount on the surface opposite to the base material of the sealant layer included in the obtained laminated film for packaging bags were measured in the same manner as in Example 1. Since the sealant layer was not wetted even when a wetting test liquid having a surface tension of 22.6 mN/m was applied, the wetting tension on the exposed surface of the sealant layer of the laminated film for packaging bags was determined to be less than 22.6 mN/m. It was done. The surface Si content was 11.7%. A pillow packaging bag and a packaging product were produced in the same manner as in Example 1 using the obtained laminated film for packaging bags. 160 packaging products were produced.

[Comparative example 1]
A laminated film for packaging bags was obtained in the same manner as in Example 1 except that the block copolymer of silylated polyethylene and PP-PE was not used. The wetting tension and surface Si amount on the surface opposite to the base material of the sealant layer included in the obtained laminated film for packaging bags were measured in the same manner as in Example 1. When the wetting test liquid having a surface tension of 33 mN/m was applied, the sealant layer got wet, so the wetting tension on the surface of the sealant layer of the laminated film for packaging bags on the side opposite to the base material was 33 mN/m or more. Ta. The surface Si content was 0% (undetectable). A pillow packaging bag and a packaging product were produced in the same manner as in Example 1 using the obtained laminated film for packaging bags. 160 packaging products were produced.

<Actual transportation process>
The packaged products (80 pieces) obtained in Example 1 and the packaged products (80 pieces) obtained in Comparative Example 1 were transported about 700 km by land. This transportation includes transportation by truck and hand carry (human-powered transportation). When transporting by truck, the room temperature in the cargo hold was set at 25°C and the humidity was set at 40%. The vehicle was transported approximately 694km by truck and approximately 6km by hand. After transportation, the degree of adhesion of the glaze, the percentage of damage to the contents, and the percentage of adhesion of the contents were confirmed.

<Actual transportation process - Evaluation of damage rate of contents>
The packaged products that had undergone the actual transportation process were observed, and it was visually confirmed whether the contents were damaged (cracks or breaks). The results are shown in Table 2.

<Actual transportation process - Glaze adhesion degree evaluation>
The degree of adhesion of the glaze was determined using the evaluation criteria shown in Table 2. As shown in Table 1, in Table 1, "glaze small lump" means a lump of glaze attached to a packaging bag whose long side is less than 5 mm. In Table 1, a "large lump of glaze" means a lump of glaze attached to a packaging bag with a long side of 5 mm or more. FIG. 5 is a schematic diagram showing how the glaze adheres to the packaging bag. The figure shown within the broken line in FIG. 5 shows the glaze attached to the exposed surface of the sealant layer included in the packaging bag. In evaluating the degree of adhesion, the shape of the glaze as shown within the broken line in FIG. 5 is visually confirmed. The long side means the longest diameter in the visually confirmed shape of the glaze. In FIG. 5, the one surrounded by a broken line A is a small lump, and the three lumps surrounded by a broken line B are all large lumps. In Table 1, the pouch surface area means the inner surface area of the pouch (approximately 88.5 mm x approximately 82.7 mm) of the exposed surface of the sealant layer provided in the packaging bag that can come into contact with the glaze of the contents. The results are shown in FIG.

When the adhesion degree is 1, there is no glaze adhesion. When the degree of adhesion is 2, there is a tendency for one small lump of glaze to adhere. When the degree of adhesion is 3, glaze small lumps tend to adhere to two or more points. When the degree of adhesion is 1 to 3, no large lumps are attached. When the degree of adhesion is 4, there is a tendency for one large lump of glaze to adhere. When the degree of adhesion is 5, large lumps of glaze tend to adhere to two or more points. At adhesion levels of 4 and 5, one or more small lumps may be attached.

<Actual transportation process - evaluation of adhesion ratio of contents>
Among the packaged products that went through the actual transportation process, we extracted the packaged products whose contents were not damaged. Among the extracted packaged products, the number of products in which the glaze adhered to the pouch and the contents did not move inside the packaging bag was counted. The results are shown in Table 3.

<Heating storage process - evaluation of damage rate of contents, adhesion rate of contents, and degree of adhesion of glaze>
The packaged products (80 pieces) obtained in Example 1 and the packaged products (80 pieces) obtained in Comparative Example 1 were transported 20 km by truck. Among the packaged products after transportation, those whose contents were damaged (cracks or breaks) were removed. As shown in Table 4, in Example 1, no packaging products were damaged, and in Comparative Example 1, there were 6 packaging products that were damaged. In Example 1, for 80 packaged products whose contents were not damaged, and in Comparative Example 1, for 74 packaged products whose contents were not damaged, the glaze adhered to the pouch and the contents were unwrapped. The number of objects that were stuck inside the bag was counted. The results are shown in Table 5. In addition, for packaged products whose contents were not damaged, the degree of glaze adhesion was evaluated using the same method as described in "<Actual transportation process - Evaluation of degree of glaze adhesion>". The results are shown in FIG.

As a result of the evaluation of the degree of glaze adhesion, for both Example 1 and Comparative Example 1, 15 packaging products with a degree of adhesion of "2" and 15 packaging products with a degree of adhesion of "3" were evaluated. I took out 15 pieces at a time. The taken out packaged product was packed into a sales case and stored in a constant temperature bath at 40° C. for 1 hour. The degree of glaze adhesion after storage was evaluated in the same manner as described in "<Actual transportation process - evaluation of degree of glaze adhesion>". The results are shown in FIG.

<Heating storage process - measurement of amount of glaze not adhering>
The contents of the packaged products that had undergone the heating storage process and subsequent glaze adhesion evaluation were taken out. The weight (W1) of the packaging bag from which the contents were taken out was measured. After the weight measurement, the packaging bag was washed and thoroughly dried. The weight (W2) of the packaging bag after drying was measured. The absolute value of the difference between W1 and W2 was taken as the weight of the glaze attached to the packaging bag. The results are shown in FIG.

The packaging bags and packaging products according to one aspect of the present invention are as described in [1] to [5] below, and have been described in detail based on the above embodiment and the above modification.
[1] A packaging bag for contents to which an adhesive substance is attached, which is a bag-shaped molded body of a laminated film having a base material layer and a sealant layer provided on the base material layer,
The bag-shaped molded body is sealed by one part of the sealant layer and the other part coming into contact with each other and being fused,
The exposed surface of the sealant layer is the innermost surface of the bag-shaped molded body,
The wetting tension of the exposed surface is less than 22.6 mN/m.
packaging bag.
[2] The sealant layer contains Si atoms,
The packaging bag according to [1], wherein the proportion of Si atoms among all atoms is 8% or more when the exposed surface of the sealant layer is measured by X-ray photoelectron spectroscopy.
[3] A main body having a cylindrical shape;
A pillow packaging bag, comprising: a back seal portion extending along the axial direction of the main body portion and protruding from the main body portion;
Both ends of the main body in the axial direction are sealed by the part of the sealant layer and the other part,
The back seal portion is configured such that when the base layer is developed, a pair of end portions of the base layer in a direction perpendicular to the thickness direction and the axial direction of the base layer are connected to the part of the sealant layer. The packaging bag according to [1] or [2], which is a part pasted together with another part.
[4] The packaging bag according to any one of [1] to [3], and the food that is the content sealed in the packaging bag, and the food has the glaze that is the adhesive substance attached. including packaging products.
[5] The packaged product according to [4], wherein the volume ratio of the food product based on the volume of the packaging bag is 70 volume % or more and 90 volume % or less.

However, one aspect of the present invention is not limited to the above embodiment, the above modification, and [1] to [5] above. One aspect of the present invention can be further modified without departing from the gist thereof.

DESCRIPTION OF SYMBOLS 1, 1A...Packaging bag, 2...Laminated film, 11...Body part, 12...Back seal part, 13...Both ends, 14...Body part, 15...Seal part, 16...Bend part, 21...Base material layer, 21a ...Main surface (one side), 21b...Main surface (other side), 21c, 21d...End portion, 22...Adhesive layer, 23...Gas barrier layer, 24...Sealant layer, 24a...Main surface (one side), 24b ...Main surface (other surface), A, B...broken line.

Claims (5)

A packaging bag for contents to which an adhesive substance is attached, which is a bag-shaped molded body of a laminated film having a base material layer and a sealant layer provided on the base material layer,
The bag-shaped molded body is sealed by one part of the sealant layer and the other part coming into contact with each other and being fused,
The exposed surface of the sealant layer is the innermost surface of the bag-shaped molded body,
The wetting tension of the exposed surface is less than 22.6 mN/m.
packaging bag. the sealant layer contains Si atoms,
The packaging bag according to claim 1, wherein the proportion of Si atoms among all atoms is 8% or more when the exposed surface of the sealant layer is measured by X-ray photoelectron spectroscopy. a main body having a cylindrical shape;
A pillow packaging bag, comprising: a back seal portion extending along the axial direction of the main body portion and protruding from the main body portion;
Both ends of the main body in the axial direction are sealed by the part of the sealant layer and the other part,
The back seal portion is configured such that when the base layer is developed, a pair of end portions of the base layer in a direction perpendicular to the thickness direction and the axial direction of the base layer are connected to the part of the sealant layer. The packaging bag according to claim 1, wherein the packaging bag is a part bonded to another part. The packaging bag according to any one of claims 1 to 3, and the food that is the content sealed in the packaging bag, the food to which the glaze that is the adhesive substance is attached. packaging products. The packaged product according to claim 4, wherein a volume ratio of the food product based on a volume of the packaging bag is 70% by volume or more and 90% by volume or less.

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