WO2024048392A1

WO2024048392A1 - Packaging and packaging product

Info

Publication number: WO2024048392A1
Application number: PCT/JP2023/030330
Authority: WO
Inventors: 里佳石井; 純一神永; 良樹越山; 裕美子小島; 寛之若林
Original assignee: Ｔｏｐｐａｎホールディングス株式会社
Priority date: 2022-08-29
Filing date: 2023-08-23
Publication date: 2024-03-07

Abstract

This packaging is made by bending and inserting a bottom member between a pair of barrel members, forming a first sealing section by heat-sealing a peripheral edge of a body part of the pair of barrel members, and forming a second sealing section by heat-sealing a peripheral edge of a bottom section of the pair of barrel members and a peripheral edge of the bottom member. The barrel members and the bottom member comprise a paper substrate, an anchor coating layer, a vacuum deposition layer, and a heat-sealing layer. The first sealing section is formed by heat-sealing the heat-sealing layers of the pair of barrel members, and the second sealing section is formed by heat-sealing the heat-sealing layer of the barrel members and the heat-sealing layer of the bottom member. The thickness of the heat-sealing layer of the barrel members is 2 to 5 μm, the thickness of the heat-sealing layer of the bottom member divided by the thickness of the heat-sealing layer of the barrel members is at least 5, and the mass ratio of the paper substrate to the total mass of the packaging is at least 70% by mass.

Description

Packaging and packaging products

The present disclosure relates to packages and packaged products.

BACKGROUND ART Conventionally, as a packaging bag, there has been known a standing pouch-shaped package obtained by making a bag by heat sealing using a pair of body member and bottom member.
As such a package, for example, the heat-sealable thermoplastic resin surfaces of the two laminates mainly made of paper constituting the body are stacked so as to face each other, and the bottom made of the bottom film is attached. This is a standing pouch-like packaging bag that is folded into a V-shape and heat-sealed around the periphery. A self-supporting packaging bag is known in which an outer bottom is formed by bending the outer bottom plates of a laminate inward and bonding the inner and outer surfaces together to form an outer bottom (for example, see Patent Document 1 below).

Japanese Patent Application Publication No. 2011-73714

Incidentally, in recent years, there has been a growing momentum to move away from plastics due to increasing environmental awareness stemming from issues such as the problem of marine plastic waste. Therefore, even in a standing pouch-shaped package, it is required to increase the mass ratio of the paper base material in the body member and the bottom member.

However, the packaging bag described in Patent Document 1 has the following problems.
That is, the packaging bag described in Patent Document 1 has room for improvement in terms of gas barrier properties and durability when increasing the mass ratio of the paper base material. Furthermore, the packaging bag described in Patent Document 1 has room for improvement in terms of improving the sealing performance of the packaged product obtained by sealing the contents when increasing the mass ratio of the paper base material. Ta.

The present disclosure has been made in view of the above problems, and it is possible to improve gas barrier properties and durability while increasing the mass ratio of the paper base material, and to seal a packaged product obtained by sealing the contents. The purpose of the present invention is to provide a packaging body and a packaging product that can also improve performance.

In order to solve the above problems, one aspect of the present disclosure is to insert a bottom member in a bent state between a pair of body members having a body part and a bottom part, and to A standing pouch shape formed by heat-sealing them together to form a first sealed portion, and heat-sealing the peripheral edges of the bottoms of the pair of body members and the peripheral edge of the bottom member to form a second sealed portion. In the package, the body member and the bottom member include a paper base material, an anchor coat layer, a vapor deposition layer containing a metal or a metal oxide, and a heat seal layer in this order, and the first seal portion is , the second sealing portion is formed by heat-sealing the heat-sealing layers of the pair of body members, and the second sealing portion is formed by heat-sealing the heat-sealing layers of the body member and the heat-sealing layer of the bottom member. formed, the thickness of the heat seal layer of the body member is in the range of 2 to 5 μm, and the ratio of the thickness of the heat seal layer of the bottom member to the thickness of the heat seal layer of the body member is 5. The above provides a package in which the mass ratio of the paper base material to the total mass of the package is 70% by mass or more.

The above package can improve gas barrier properties and durability while increasing the mass ratio of the paper base material, and can also improve the sealing performance of the packaged product obtained by sealing the contents.
The reason why the above effect is obtained is presumed as follows.
That is, by reducing the thickness of the heat-sealing layer of the pair of body members to 2 to 5 μm and making the ratio of the thickness of the heat-sealing layer of the bottom member to the thickness of the heat-sealing layer of the body member 5 or more, the packaging Since the ratio of the surface area of the pair of trunk members to the body is large, the mass ratio of the paper base material to the total mass of the package can be increased. In addition, in the package, by setting the ratio of the thickness of the heat sealing layer of the bottom member to the thickness of the heat sealing layer of the body member to be 5 or more, the bottom member is Even when bent, the gas barrier properties of the bottom member can be improved. Further, the peripheral edges of the body parts of the pair of body members are heat-sealed to form a first sealing part, and the peripheral edges of the bottom parts of the pair of body members and the peripheral edge of the bottom member are heat-sealed to form a second sealing part. When forming the seal part, the heat seal layer of the bottom member, which is sufficiently thicker than the body member, is melted, so that gaps between the first seal part and the second seal part of the package, where gaps are likely to be formed due to differences in level, are melted. The melted heat seal layer at the intersection sufficiently fills the space, making it difficult for gaps to form. Therefore, in a packaged product obtained by sealing the contents in the package, leakage of the contents from the gaps is suppressed, and the sealing performance of the packaged product can also be improved. Furthermore, since a gap is less likely to form at the intersection of the first seal part and the second seal part of the package, even if the packaged product obtained by sealing the contents in the package is dropped and receives an impact, this gap will not occur. Peeling at the first sealing portion and peeling at the second sealing portion starting from the first sealing portion can be easily suppressed. Therefore, the package of the present disclosure can also improve durability.

In the above package, it is preferable that no gap is formed at the intersection between the first seal part and the second seal part.
In this case, since no gap is formed at the intersection between the first seal part and the second seal part, leakage of the contents from the gap is further suppressed in the packaged product obtained by sealing the contents in the package. , it is also possible to further improve the sealing properties of packaged products. In addition, even if a packaged product obtained by sealing the contents in a package is subjected to impact due to a fall, the packaged product will peel off at the first seal part starting from the gap and at the second seal part. Peeling is more easily suppressed. Therefore, the package of the present disclosure can also further improve durability.

In the above package, the heat seal layer of the body member includes at least one type selected from the group consisting of carboxyl groups and salts of carboxyl groups (hereinafter also referred to as "carboxyl groups/salts of carboxyl groups"). ) The heat-sealing layer of the bottom member may be a polyolefin film, and may be a coating film obtained by coating and drying an aqueous dispersion obtained by dispersing polyolefin as a resin component in water.
In this case, the heat-sealing layer is a coating film obtained by coating and drying an aqueous dispersion in which a polyolefin having a carboxyl group/carboxyl group salt is dispersed in water as a resin component. It is possible to improve the ease of opening. Moreover, it becomes possible to form a thin heat-sealing layer, and it becomes easier to increase the mass ratio of the paper base material to the total mass of the package. In addition, since the heat-sealing layer of the bottom member is a polyolefin film, the strength of the bottom member is improved compared to when the heat-sealing layer is the above-mentioned coating film, and the gas barrier property is improved even when the bottom member is bent in the package. can be further improved.

When the heat-sealing layer is a polyolefin film, the package may further include an adhesive layer between the vapor deposition layer and the heat-sealing layer in the bottom member.
In this case, the adhesion between the vapor deposited layer and the heat seal layer can be improved, and peeling between the vapor deposited layer and the heat seal layer can be suppressed.
The package may further include an overcoat layer between the vapor deposition layer and the adhesive layer in the bottom member.
In the above package, the overcoat layer may contain a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group.

In the above package, the ratio of the thickness of the paper base material of the bottom member to the total thickness of the heat seal layer of the body member and the heat seal layer of the bottom member may be greater than 0.5. .
In this case, it becomes easier to increase the mass ratio of the paper base material to the total mass of the package.
In the above package, the ratio of the thickness of the paper base material of the bottom member to the total thickness of the heat seal layer of the body member and the heat seal layer of the bottom member may be 5.0 or less. .

In the above package, in the trunk member and the bottom member, the anchor coat layer may contain a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group.
In this case, since the anchor coat layer has excellent flexibility, cracking of the vapor deposited layer can be suppressed even when the body member and the bottom member are bent, and the adhesion between the anchor coat layer and the vapor deposited layer can be further improved. Can be done.

In the package, the anchor coat layer in the trunk member and the bottom member may contain polyvinyl alcohol.
In this case, since the anchor coat layer has excellent flexibility, cracking of the vapor deposited layer can be suppressed even when the body member and the bottom member are bent, and the adhesion between the anchor coat layer and the vapor deposited layer can be further improved. Can be done.
In the package, the anchor coat layer in the trunk member and the bottom member may contain a polyurethane resin.
In this case, the gas barrier properties of the package can be further improved.
In the package, the ratio of the thickness of the heat seal layer of the bottom member to the thickness of the heat seal layer of the body member may be 100 or less.
In the above package, the paper base material may be uncoated paper without a clay coat layer.

Another aspect of the present disclosure provides a packaged product obtained by sealing the contents in the package described above.
The above-mentioned packaging product can improve gas barrier properties and durability, and can also improve sealing performance while increasing the mass ratio of the paper base material to the total mass of the package.

According to the present disclosure, there is provided a packaging body that can improve gas barrier properties and durability while increasing the mass ratio of the paper base material, and can also improve the sealing performance of a packaged product obtained by sealing the contents. and packaging products are provided.

It is a front view showing one embodiment of a package of the present disclosure. 2 is a sectional view taken along line II-II in FIG. 1. FIG. FIG. 2 is a sectional view showing the trunk member of FIG. 1; FIG. 2 is a sectional view showing the bottom member of FIG. 1; FIG. 2 is a sectional view showing a modification of the trunk member of FIG. 1; FIG. 2 is a sectional view showing a modification of the bottom member of FIG. 1; FIG. 1 is a front view showing an embodiment of the packaged product of the present disclosure.

Hereinafter, embodiments of the package of the present disclosure will be described in detail with reference to FIGS. 1 to 4. FIG. 1 is a front view showing an embodiment of the package of the present disclosure, FIG. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view showing the trunk member in FIG. 4 is a sectional view showing the bottom member of FIG. 1;

In the package 100 shown in FIGS. 1 and 2, a bottom member 20 is inserted in a bent state between a pair of body members 10 having a body part 10a and a bottom part 10b, and the body part 10a of the pair of body members 10 is The peripheral edges of the pair of body members 10 are heat-sealed to form a first sealed portion 30A, and the peripheral edges of the bottom portions 10b of the pair of body members 10 and the bottom member 20 are heat-sealed to form a second sealed portion 30B. It is a package made of

As shown in FIG. 3, the pair of body members 10 includes a paper base material 11, an anchor coat layer 12, a vapor deposition layer 13 containing metal or metal oxide, and a heat seal layer 14 in this order. The thickness T1 of the heat seal layer 14 of the member 10 is in the range of 2 to 5 μm.

As shown in FIG. 4, the bottom member 20 includes a paper base material 21, an anchor coat layer 12, a vapor deposition layer 23 containing metal or metal oxide, and a heat seal layer 24 in this order. The ratio R (T2/T1) of the thickness T2 of the heat seal layer 24 of the bottom member 20 to the thickness T1 of the heat seal layer 14 is 5 or more.

The first seal portion 30A is formed by heat sealing the heat seal layers 14 of the pair of body members 10, and the second seal portion 30B is formed by heat sealing the heat seal layers 14 of the body members 10 and the bottom member 20. It is formed by heat sealing the layer 24.
Moreover, the mass ratio of the

paper base materials

11 and 21 to the total mass of the package 100 is 70% by mass or more.

The above package 100 can improve gas barrier properties and durability while increasing the mass ratio of the

paper base materials

11 and 21, and can also improve the sealing performance of the packaged product obtained by sealing the contents. can.

Hereinafter, the mass ratio of the paper base material to the total mass of the trunk member 10, the bottom member 20, and the package 100 will be explained in detail.

<Body member>
As described above, the body member 10 includes the paper base material 11, the anchor coat layer 12, the vapor deposition layer 13, and the heat seal layer 14 in this order.

(Paper base material)
The paper base material 11 is not particularly limited as long as it is a base material having paper. Here, paper refers to a material containing plant-derived pulp as a main component, and the main component refers to a component containing 50% by mass or more of plant-derived pulp in the material. By providing the body member 10 with the paper base material 1, it is possible to contribute to reducing the amount of plastic material used.

Specific examples of the paper base material 11 include wood-free paper, special wood-free paper, coated paper, art paper, cast-coated paper, imitation paper and kraft paper, and glassine paper.

The basis weight of the paper base material 11 is not particularly limited, and may be, for example, 20 g/m ² or more, or 30 g/m ² or more, but from the viewpoint of the independence of the packaging body 100, , 30 g/m ² or more. Further, the basis weight of the paper base material 11 may be 500 g/m ² or less, and may be 100 g/m ² or less.

The paper base material 11 may further include a coat layer at least on the anchor coat layer 12 side of the paper. By having the paper base material 11 further include a coat layer, it is possible to prevent the anchor coat layer 12 from seeping into the paper, improve gas barrier properties, and serve as a filler to fill in the unevenness of the paper. It is also possible to form the anchor coat layer 12 uniformly without any defects. The coat layer may further contain a binder resin and, if necessary, a filler. Examples of the binder resin include various copolymers such as styrene-butadiene copolymer, styrene-acrylic copolymer, ethylene-vinyl acetate copolymer, polyvinyl alcohol resin, cellulose resin, and the like. Examples of fillers include kaolin, calcium carbonate, talc, mica, and the like.

The thickness of the coat layer is not particularly limited, but may be, for example, 1 μm or more, or 3 μm or more. The thickness of the coat layer may be 10 μm or less, or 8 μm or less.
The paper base material 11 may be composed only of paper. That is, the paper base material 11 may be uncoated paper without a coat layer.

(Anchor coat layer)
The anchor coat layer 12 is provided on the surface of the paper base material 11 to improve the adhesion between the paper base material 11 and the vapor deposition layer 13 and to improve the gas barrier properties of the body member 10. .

The anchor coat layer 12 is not particularly limited, and may contain at least one of a polyolefin having a carboxyl group/a salt of a carboxyl group, polyvinyl alcohol, and a polyurethane resin. When the anchor coat layer 12 contains at least one of polyolefin having a carboxyl group/carboxyl group salt and polyvinyl alcohol, the anchor coat layer 12 has excellent flexibility, and even when the body member 10 is bent, the vapor deposited layer 13 It is possible to suppress cracking of the paper base material 11 and improve the adhesion between the paper base material 11 and the vapor deposited layer 13. When the anchor coat layer 12 contains a polyurethane resin, the gas barrier properties of the package 100 can be further improved.
In particular, when the anchor coat layer 12 contains the above-described polyolefin, the anchor coat layer 12 can be formed as a dense film due to the crystallinity of the polyolefin. Moreover, since polyolefin has few polar groups, the water vapor barrier properties of the body member 10 can be improved.
Further, when the anchor coat layer 12 contains the above-mentioned polyvinyl alcohol, the oxygen barrier properties of the body member 10 can be further improved.

When the anchor coat layer 12 includes a polyolefin having a carboxyl group/carboxyl group salt, the polyolefin is a copolymer of an olefin such as ethylene or propylene and an unsaturated compound such as acrylic acid, methacrylic acid, or maleic anhydride. etc. are used. Specifically, copolymers of ethylene and acrylic acid, copolymers of ethylene and methacrylic acid, copolymers of propylene and acrylic acid, copolymers of propylene and methacrylic acid, and ethylene and anhydride. Examples include copolymers with maleic acid.

Examples of the polyvinyl alcohol include completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, modified polyvinyl alcohol, and ethylene-vinyl alcohol copolymer resin. Further, the degree of polymerization of polyvinyl alcohol is preferably 300 or more and 1500 or less. If the degree of polymerization is 300 or more, the barrier properties and bending resistance of the body member 10 will be good, and if the degree of polymerization is 1500 or less, the viscosity of the polyvinyl alcohol coating liquid will be low and the coating properties will be good.
The polyurethane resin is not particularly limited as long as it has a urethane bond, but from the viewpoint of barrier properties, polyurethane resins may be selected from among structural units derived from metaxylylene diisocyanate and hydrogenated metaxylylene diisocyanate. It is preferable to contain at least one of them. When the polyurethane resin contains such a structural unit, it exhibits high cohesive force due to hydrogen bonding and the stacking effect between xylylene groups, and therefore gas barrier properties tend to be further improved. As the coating liquid used when forming the anchor coat layer containing the polyurethane resin, from the viewpoint of coating properties, a coating liquid dispersed in water such as a dispersion or an emulsion is preferable. An example of such a coating liquid is Takelac WPB manufactured by Mitsui Chemicals.

The anchor coat layer 12 may contain other components in addition to the polyolefin, polyvinyl alcohol, or polyurethane resin. Examples of other components include polyolefins other than the above polyolefins, silane coupling agents, organic titanates, polyacrylics, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyimides, melamine, and phenols.

The content of polyolefin or polyvinyl alcohol in the anchor coat layer 12 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass. .

The thickness of the anchor coat layer 12 may be, for example, 1 μm or more, 2 μm or more, and 20 μm or less. Further, the thickness of the anchor coat layer 12 may be 10 μm or less, or 5 μm or less. If the thickness of the anchor coat layer 12 is 1 μm or more, the unevenness of the paper base material 11 described above can be efficiently filled, and the vapor deposition layer 13 can be uniformly laminated. Moreover, if the thickness of the anchor coat layer 12 is 20 μm or less, the vapor deposition layer 13 can be uniformly laminated while keeping costs down.

The anchor coat layer 12 can be formed by applying a coating liquid containing at least the above-mentioned polyolefin or polyvinyl alcohol and a solvent onto the paper base material 11 and drying it. The smaller the average particle size of the polyolefin or polyvinyl alcohol in the coating liquid, the better from the viewpoints of smoothing the coating surface after drying, uniformly laminating the vapor deposited layer 13, and improving barrier properties. Specifically, the average particle size of the polyolefin or polyvinyl alcohol in the coating liquid may be 1 μm or less, 0.7 μm or less, or 0.5 μm or less. The lower limit of the average particle diameter of polyolefin or polyvinyl alcohol is not particularly limited, but may be, for example, 1 nm.

Examples of the solvent contained in the coating liquid include water, methyl alcohol, ethyl alcohol, isopropyl alcohol, n-propyl alcohol, n-butyl alcohol, n-pentyl alcohol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, and hexane. , heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, and butyl acetate. These solvents may be used alone or in combination of two or more. Among these, from the viewpoint of properties, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferred. Also, from the environmental point of view, methyl alcohol, ethyl alcohol, isopropyl alcohol, and water are preferred.

(vapor deposited layer)
Deposited layer 13 contains metal or metal oxide. The vapor deposition layer 13 is a layer obtained by vapor depositing a metal or a metal oxide. Examples of the metal include aluminum (AL). Examples of metal oxides include inorganic oxides such as aluminum oxide (AlO _x ) and silicon oxide (SiO _x ).

The thickness of the vapor deposited layer 13 may be appropriately set depending on the intended use of the package 100, but is preferably 30 nm or more, more preferably 50 nm or more. By setting the thickness of the vapor deposited layer 13 to 30 nm or more, the continuity of the vapor deposited layer 13 can be improved. The thickness of the vapor deposited layer 13 is preferably 100 nm or less, more preferably 80 nm or less. By setting the thickness of the vapor deposited layer 13 to 100 nm or less, the occurrence of curls and cracks in the vapor deposited layer 13 can be sufficiently suppressed, and sufficient gas barrier performance and flexibility can be easily achieved.

The vapor deposition layer 13 is preferably formed by vacuum film forming means from the viewpoint of oxygen gas barrier performance and film uniformity. Vacuum film forming means include known methods such as vacuum evaporation, sputtering, and chemical vapor deposition (CVD), but vacuum evaporation is preferred because of its fast film formation rate and high productivity. Furthermore, among vacuum evaporation methods, film formation methods using electron beam heating are particularly effective because the film formation rate can be easily controlled by the irradiation area or electron beam current, and the temperature of the evaporation material can be raised and lowered in a short time. It is.

(heat seal layer)
The heat-sealing layer 14 may be any layer as long as it has heat-sealing properties. The heat seal layer 14 can protect the vapor deposited layer 13 by sandwiching the vapor deposited layer 13 together with the anchor coat layer 12 .

The material constituting the heat seal layer 14 is not particularly limited, but may be obtained, for example, by coating and drying an aqueous dispersion in which a polyolefin having a carboxyl group/carboxyl group salt is dispersed in water as a resin component. It may be a paint film (heat seal varnish).
In this case, the heat-sealing layer 14 is a coating film obtained by coating and drying an aqueous dispersion in which a polyolefin having a carboxyl group/carboxyl group salt is dispersed in water as a resin component. The ease of opening can be improved. Moreover, it becomes possible to form the heat-sealing layer 14 thinly, and it becomes easier to increase the mass ratio of the paper base material to the total mass of the package 100.

Polyolefins having carboxyl groups/carboxyl group salts are copolymerized with olefins such as ethylene and propylene and salts of unsaturated carboxylic acids (unsaturated compounds having carboxyl groups such as acrylic acid, methacrylic acid, and maleic anhydride). Examples include polyolefins.

Heat seal layer 14 may be a polyolefin film.
Polyolefin films include polyolefins. This polyolefin may or may not contain carboxyl groups/carboxyl group salts. Examples of polyolefins include low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), ethylene-vinyl acetate copolymer, propylene homopolymer, and ethylene. -propylene block copolymers, ethylene-propylene random copolymers, etc. These can be used alone or in combination of two or more.

The content of polyolefin in the heat seal layer 14 may be, for example, 50% by mass or more, 70% by mass or more, 90% by mass or more, or 100% by mass.

The heat seal layer 14 may contain other components in addition to the polyolefin described above. Examples of other components include silane coupling agents, adhesion agents such as organometallic compounds, various antifoaming agents, and leveling agents. Further, the heat seal layer 14 may contain additives such as wax in order to impart slipperiness and anti-blocking properties.

The thickness of the heat seal layer 14 is within the range of 2 to 5 μm. When the thickness of the heat seal layer 14 is 2 μm or more, the seal strength in the first seal portion 30A and the second seal portion 30B is improved more than when the thickness of the heat seal layer 14 is less than 2 μm. This makes it possible to improve the durability of the package 100. When the thickness of the heat-sealing layer 14 is 5 μm or less, the mass ratio of the

paper base materials

11 and 21 to the total mass of the package 100 is increased more than when the thickness of the heat-sealing layer 14 is more than 5 μm. be able to. In addition, when the heat seal layer 14 is a coating film obtained by coating and drying an aqueous dispersion in which a polyolefin having a carboxyl group/carboxyl group salt is dispersed in water as a resin component, the water dispersion of the polyolefin It becomes easier to apply the dispersion.

The thickness of the heat seal layer 14 may be 2.2 μm or more, 2.5 μm or more, or 3.0 μm or more. Further, the thickness of the heat seal layer 14 may be 4.5 μm or less, or may be 4 μm or less.

The heat seal layer 14 may be composed of a single layer or a multilayer of two or more layers.

(Adhesive layer)
When the heat seal layer 14 is a polyolefin film, the body member 10 may further include an adhesive layer 15 between the vapor deposition layer 13 and the heat seal layer 14, as shown in FIG. In this case, the adhesion between the vapor deposited layer 13 and the heat seal layer 14 can be improved, and peeling of the vapor deposited layer 13 and the heat seal layer 14 can be suppressed.

The adhesive layer 15 is a layer containing an adhesive. Although the adhesive is not particularly limited, examples of the adhesive include a two-component curing type urethane adhesive.
The adhesive may be an adhesive having gas barrier properties.

The thickness of the adhesive layer 15 is not particularly limited, but is preferably 1 to 5 μm.

(overcoat layer)
The body member 10 may further include an overcoat layer 16 between the vapor deposition layer 13 and the adhesive layer 15, as shown in FIG. The overcoat layer 16 is not particularly limited, but the same layer as the anchor coat layer 12 can be used. Such an overcoat layer 16 has excellent flexibility and can suppress cracking of the vapor deposited layer 13 together with the anchor coat layer 12 even when the body member 10 is bent, and further improves the gas barrier properties of the body member 10. Can be done.

The material constituting the overcoat layer 16 may be the same as or different from the material constituting the anchor coat layer 12.

<Bottom member>
As described above, the bottom member 20 includes the paper base material 21, the anchor coat layer 22, the vapor deposition layer 23, and the heat seal layer 24 in this order.

(Paper base material)
As the paper base material 21, the same paper base material as the paper base material 11 can be used. The paper base material 21 may be the same as or different from the paper base material 11 in terms of material, thickness, basis weight, etc.
The ratio P of the thickness of the paper base material 21 of the bottom member 20 to the total thickness (T1+T2) of the heat seal layer 14 of the body member 10 and the heat seal layer 24 of the bottom member 20 is not particularly limited, and is 0. Although it may be 5 or less or greater than 0.5, it is preferably greater than 0.5.
In this case, it becomes easier to increase the mass ratio of the

paper base materials

11 and 21 to the total mass of the package 100.
The ratio P may be 0.8 or more, 1.0 or more, 1.1 or more, or 1.2 or more. The ratio P may be 5.0 or less, 3.0 or less, 2.5 or less, 2.0 or less, or 1.5 or less.

(Anchor coat layer)
As the anchor coat layer 22, the same anchor coat layer as the anchor coat layer 12 can be used. Anchor coat layer 22 may be the same as or different from anchor coat layer 12 in terms of material, thickness, etc.

(vapor deposited layer)
As the vapor deposition layer 23, a vapor deposition layer similar to the vapor deposition layer 13 can be used. The vapor deposition layer 23 may be the same as or different from the vapor deposition layer 13 in terms of material, thickness, etc.

(heat seal layer)
As the heat seal layer 24, a heat seal layer similar to the heat seal layer 14 can be used.

However, the ratio R of the thickness T2 of the heat seal layer 24 of the bottom member 20 to the thickness T1 of the heat seal layer 14 of the body member 10 is 5 or more. In this case, compared to the case where the ratio R is less than 5, the peripheral edges of the main body parts 10a of the pair of body members 10 are heat-sealed to form the first sealed part 30A, and the bottom of the pair of body members 10 10b and the bottom member 20 to form the second seal portion 30B, the heat seal layer 24 of the bottom member 20, which is sufficiently thicker than the body member 10, is melted. Therefore, the space is sufficiently filled by the melted heat seal layer 24 at the intersection X between the first seal portion 30A and the second seal portion 30B of the package 100, and a gap is less likely to occur.

The ratio R may be 7 or more, 8 or more, 10 or more, 13 or more, or 15 or more. Further, the ratio R may be 100 or less, 80 or less, 60 or less, 40 or less, 20 or less, 18 or less, 15 or less, or 10 or less.

The heat-sealing layer 24 may be a coating film obtained by coating and drying an aqueous dispersion in which a polyolefin having a carboxyl group/carboxyl group salt is dispersed in water as a resin component, or may be a polyolefin film. However, a polyolefin film is preferred. In this case, since the heat-sealing layer 24 of the bottom member 20 is a polyolefin film, the strength of the bottom member 20 is further improved compared to the case where the heat-sealing layer 24 is the above-mentioned coating film, and the bottom member 20 is a polyolefin film. Even if the bent portion 20a is formed by being bent at the bending portion 20a, the gas barrier property at the bent portion 20a can be further improved.

Further, the polyolefin contained in the heat-sealing layer 24 may be the same as or different from the polyolefin contained in the heat-sealing layer 14 of the body member 10, but it is preferably the same. For example, when the polyolefin contained in the heat seal layer 24 is polyethylene, the polyolefin contained in the heat seal layer 14 of the body member 10 is preferably polyethylene. In this case, the adhesion between the heat seal layer 14 of the trunk member 10 and the heat seal layer 24 of the bottom member 20 can be further improved in the second seal portion 30B.

(adhesive layer)
When the heat seal layer 24 is a polyolefin film, the bottom member 20 may further include an adhesive layer 25 between the vapor deposition layer 23 and the heat seal layer 24, as shown in FIG. In this case, the adhesion between the vapor deposited layer 23 and the heat seal layer 24 can be improved, and peeling between the vapor deposited layer 23 and the heat seal layer 24 can be suppressed.

The adhesive layer 25 is a layer containing an adhesive. Although the adhesive is not particularly limited, examples of the adhesive include a two-component curing type urethane adhesive.
The adhesive may be an adhesive having gas barrier properties.

The thickness of the adhesive layer 25 is not particularly limited, but is preferably 1 to 5 μm.

(overcoat layer)
The bottom member 20 may further include an overcoat layer 26 between the vapor deposition layer 23 and the adhesive layer 25, as shown in FIG. The overcoat layer 26 is not particularly limited, but the same layer as the anchor coat layer 22 can be used. Such an overcoat layer 26 has excellent flexibility and can suppress cracking of the vapor deposited layer 23 together with the anchor coat layer 22 even if the bottom member 20 is bent, and further improves the gas barrier properties of the bottom member 20. Can be done.

The material constituting the overcoat layer 26 may be the same as or different from the material constituting the anchor coat layer 22.

<Mass ratio of paper base material to total mass of package>
The mass ratio of the

paper base materials

11 and 21 to the total mass of the package 100 may be 70% by mass or more, but the mass ratio may be 75% by mass or more, or even 80% by mass or more. good. The mass ratio may be 100% by mass or less, or 95% by mass or less.

<Packaged products>
Next, an embodiment of the packaged product of the present disclosure will be described using FIG. 7. FIG. 7 is a front view showing one embodiment of the packaged product of the present disclosure.
The packaging product 200 shown in FIG. 7 is obtained by sealing the contents C in the packaging body 100. , gas barrier properties and durability can be improved, and sealing performance can also be improved. After the package 100 accommodates the content C, the content C can be sealed by heat-sealing the upper edges forming the openings of the pair of body members 10.
Contents C include foods, medicines, liquids, electronic parts, and the like.

The summary of this disclosure is as follows.
[1] A bottom member is inserted in a bent state between a pair of body members having a body part and a bottom part, and the peripheral edges of the body parts of the pair of body members are heat-sealed to form a first seal part. A standing pouch-shaped package formed by forming a second sealed part by heat-sealing the peripheral edge of the bottom of the pair of body members and the peripheral edge of the bottom member, the package body having the shape of a standing pouch. and the bottom member includes a paper base material, an anchor coat layer, a vapor deposition layer containing a metal or a metal oxide, and a heat sealing layer in this order, and the first sealing portion includes the heat sealing layer of the pair of body members. The second seal portion is formed by heat sealing the layers of the body member and the heat seal layer of the bottom member, and the second seal portion is formed by heat sealing the heat seal layer of the body member and the heat seal layer of the bottom member, and the second seal portion is formed by heat sealing the heat seal layer of the body member and the heat seal layer of the bottom member. The thickness of the layer is in the range of 2 to 5 μm, the ratio of the thickness of the heat seal layer of the bottom member to the thickness of the heat seal layer of the body member is 5 or more, and the total mass of the package A packaging body in which the paper base material has a mass ratio of 70% by mass or more.
[2] The package according to [1], wherein no gap is formed at the intersection between the first seal portion and the second seal portion.
[3] The heat-sealing layer of the body member is coated with an aqueous dispersion in which a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group is dispersed in water as a resin component. The package according to [1] or [2], wherein the package is made of a coating film obtained by drying, and the heat seal layer of the bottom member is a polyolefin film.
[4] The package according to [3], further comprising an adhesive layer between the vapor deposition layer and the heat seal layer in the bottom member.
[5] The package according to [4], wherein the bottom member further includes an overcoat layer between the vapor deposition layer and the adhesive layer.
[6] The package according to [5], wherein the overcoat layer contains a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group.
[7] The ratio of the thickness of the paper base material of the bottom member to the total thickness of the heat seal layer of the body member and the heat seal layer of the bottom member is greater than 0.5, [1] The package according to any one of [6].
[8] The ratio of the thickness of the paper base material of the bottom member to the total thickness of the heat seal layer of the body member and the heat seal layer of the bottom member is 5.0 or less, [1] to The package according to any one of [7].
[9] In the body member and the bottom member, the anchor coat layer includes a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group, according to [1] to [8]. The package described in any of the above.
[10] The package according to any one of [1] to [8], wherein in the body member and the bottom member, the anchor coat layer contains polyvinyl alcohol.
[11] The package according to any one of [1] to [8], wherein in the body member and the bottom member, the anchor coat layer contains a polyurethane resin.
[12] The package according to any one of [1] to [11], wherein the ratio of the thickness of the heat seal layer of the bottom member to the thickness of the heat seal layer of the body member is 100 or less.
[13] The package according to any one of [1] to [12], wherein the paper base material is non-coated paper without a clay coat layer.
[14] A packaged product obtained by sealing the contents in the package according to any one of [1] to [13].

Hereinafter, the present disclosure will be explained in more detail with reference to examples, but the present disclosure is not limited to these examples.

(Example 1)
<Production of body member>
A clay coated paper (basis weight 60 g/m ² ) formed by forming a 5 μm thick clay coat layer on one side of a 55 μm thick paper was prepared as a paper base material, and on the clay coat layer of this clay coated paper was prepared. Then, a coating liquid for forming an anchor coat layer was applied so as to have a thickness of 3 μm after drying, and dried to form an anchor coat layer. At this time, as the coating liquid for forming the anchor coat layer, an aqueous dispersion (manufactured by Mitsui Chemicals, Inc., product name: "Chemi Pearl S500 ” (hereinafter also referred to as “polyolefin coat 1”) was used.
Thereafter, an Al layer with a thickness of 50 nm was formed on the anchor coat layer by vacuum evaporation.
Next, a coating liquid for forming a heat seal layer was applied onto the surface of the Al layer so that the thickness after drying was 3 μm, and dried to form a heat seal layer. At this time, the same polyolefin coat 1 as the coating liquid for forming the anchor coat layer was used as the coating liquid for forming the heat seal layer.
In this way, a body member having dimensions of 200 mm in length and 150 mm in width was produced.

<Production of bottom member>
A clay coated paper (basis weight 60 g/m ² ) formed by forming a 5 μm thick clay coat layer on one side of a 55 μm thick paper was prepared as a paper base material, and on the clay coat layer of this clay coated paper was prepared. Then, a coating liquid for forming an anchor coat layer was applied so as to have a thickness of 3 μm after drying, and dried to form an anchor coat layer. At this time, the same polyolefin coat 1 as the coating liquid for forming the anchor coat layer of the body member was used as the coating liquid for forming the anchor coat layer.
Thereafter, an Al layer with a thickness of 50 nm was formed on the anchor coat layer by vacuum evaporation.
Next, a coating solution for forming an overcoat layer was applied onto the Al layer so that the thickness after drying was 3 μm, and dried to form an overcoat layer. At this time, as a coating liquid for forming an overcoat layer, an aqueous dispersion (polyolefin coat 1) in which polyolefin having a carboxyl group/carboxyl group salt was dispersed in water as a resin component was used.
Next, on the surface of the overcoat layer, a cured urethane adhesive was applied as an adhesive so that the coating amount after drying was 2 μm, and a 40 μm thick LLDPE film was bonded thereto. At this time, the urethane curing adhesive contains a polyester polyol (manufactured by Mitsui Chemicals, Inc., trade name: Takelac A525) as a main ingredient, and a polyisocyanate (manufactured by Mitsui Chemicals, Inc., trade name: Takenate A52) as a curing agent. A mixed solution prepared by mixing and diluting with ethyl acetate was used.
In this way, a bottom member having dimensions of 150 mm in length and 70 mm in width was produced.

<Production of a standing pouch-shaped package>
Using the pair of body members and one bottom member obtained as described above, a standing pouch-shaped package was produced using a normal standing pouch-shaped package making machine.
Specifically, a pair of body members are inserted with the heat-sealing layers facing each other on the inside, and the bottom member is folded in half and inserted between them with the heat-sealing layer facing outward, and the peripheral edge of the bottom member is inserted. and the peripheral edge of the bottom of the body member to form a second seal part (bottom seal part), and also heat seal the opposite side edges of the pair of body members to form a first seal part (side seal part). A seal part) was formed.
Note that heat sealing between the upper ends of the pair of body members was not performed.
In this way, a standing pouch-shaped package having dimensions of 200 mm long x 150 mm wide x 35 mm folded when viewed from the front and having an opening at the top was produced. Note that "folding" refers to the folding depth from the lower end of the body member to the bent portion of the bottom member.
In the obtained package, when the intersection between the first seal part and the second seal part was observed, no gap was formed.

(Example 2)
A package was produced in the same manner as in Example 1 except that an overcoat layer was not formed when producing the bottom member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

(Example 3)
Polyvinyl alcohol (PVA) with a degree of polymerization of 500 (manufactured by Kuraray Co., Ltd., trade name: "Poval 5-98") was mixed with a mixed solvent of water and isopropyl alcohol (IPA) (water/IPA = 90/10 (mass ratio)). ) to prepare a PVA coating liquid (solid content: 5% by mass), and when producing the bottom member and the body member, the PVA coating liquid was mixed so that the thickness after drying was 3 μm. A package was produced in the same manner as in Example 1, except that the anchor coat layer was formed by coating the solution.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

(Example 4)
When producing the bottom member and body member, clay coated paper (basis weight: 50 g/m ² ), which is formed by forming a 4 μm thick clay coat layer on 46 μm thick paper, was used as the paper base material. A package was produced in the same manner as in Example 1 except that a 30 μm thick LLDPE film was used as the heat seal layer when producing the bottom member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

(Example 5)
When producing the bottom member and body member, clay coated paper (basis weight: 50 g/m ² ), which is formed by forming a 4 μm thick clay coat layer on 46 μm thick paper, was used as the paper base material. A package was produced in the same manner as in Example 1 except that a 20 μm thick LLDPE film was used as the heat seal layer when producing the bottom member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

(Example 6)
A package was produced in the same manner as in Example 1 except that the thickness of the heat seal layer was 2.5 μm when producing the body member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

(Example 7)
A package was produced in the same manner as in Example 1 except that the thickness of the heat seal layer was 4.8 μm when producing the body member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.
(Example 8)
An aqueous dispersion of polyurethane resin (PU) (manufactured by Mitsui Chemicals, trade name: "Takelac WPB-341", solid content concentration 30% by mass) was used when producing the bottom member and the body member. A package was produced in the same manner as in Example 1, except that the anchor coat layer was formed by applying the coating liquid to a thickness of 3 μm after drying.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.
(Example 9)
When producing the bottom member and the body member, an aqueous dispersion (manufactured by Sumitomo Seika Co., Ltd., product name: "Zaikusen AC") is prepared by dispersing polyolefin having a carboxyl group/carboxyl group salt in water as a resin component. A package was produced in the same manner as in Example 1, except that an anchor coat layer was formed by applying a polyolefin coat (hereinafter also referred to as "polyolefin coat 2") to a thickness of 3 μm after drying.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.
(Example 10)
A package was produced in the same manner as in Example 3 except that 50 μm thick kraft paper (basis weight 50 g/m ² ) was used as the paper base material when producing the bottom member and body member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

(Comparative example 1)
When producing the bottom member, instead of forming an overcoat layer, an adhesive layer, and a heat seal layer on the Al vapor deposition layer, only a 3 μm thick heat seal layer was formed, and this heat seal layer was A package was produced in the same manner as in Example 1 except that it was formed using the coating liquid for forming a heat seal layer (polyolefin coat 1) used in producing the body member.
In addition, in the obtained package, when the intersection of the first seal part and the second seal part was observed, a gap was formed.

(Comparative example 2)
A package was produced in the same manner as in Example 1 except that a 10 μm thick LLDPE film was used as the heat seal layer when producing the bottom member.
In addition, in the obtained package, when the intersection of the first seal part and the second seal part was observed, a gap was formed.

(Reference example 1)
A package was produced in the same manner as in Example 1 except that the bottom member of Example 2 was used as the body member.
In addition, when the intersection part of the 1st seal part and the 2nd seal part was observed in the obtained package, no gap was formed.

<Calculation of mass ratio of paper base material>
The mass ratio A of the paper base material to the total mass of the package was calculated based on the following formula. The results are shown in Tables 1 to 4.
A (mass%)
=100×
[Mass B1 (g) of the paper base material (clay coated paper) in the bottom member + Mass B2 x 2 (g) of the paper base material (clay coated paper) in the body member]/[Mass C1 (g) of the bottom member )+mass of body member C2×2(g)]
Note that B1, B2, C1, and C2 were calculated using the following parameters.
・Area of bottom member S1 = 150mm x 70mm
・Area of body member S2 = 200mm x 150mm
・Density of anchor coat layer (polyolefin coat 1): 1.0 g/cm ³
・Density of anchor coat layer (polyolefin coat 2): 1.0 g/cm ³
・Density of anchor coat layer (PVA film): 1.2 g/cm ³
・Density of vapor deposited layer: 2.7 (g/cm ³ )
・Density of overcoat layer (polyolefin coat 1): 1.0 g/cm ³
・Density of adhesive layer: 1.5 (g/cm ³ )
・Density of heat seal layer (LLDPE): 0.9 g/cm ³
・Density of heat seal layer (polyolefin coat 1): 1.0 g/cm ³

<Durability evaluation>
For the packages obtained in Examples 1 to 10, Comparative Examples 1 to 2, and Reference Example 1, 30 g of plastic resin was poured as contents through the opening, and then the upper ends of the body members of the packages were heat-sealed. The contents were sealed. Three test samples were thus prepared.
Then, each test sample was subjected to a bag drop test in which the bag was dropped from a height of 100 cm from the floor and the number of times the bag was dropped until it burst was counted. Then, the average value of the number of dropped bags for the three test samples was calculated as the number of dropped bags, and this number of dropped bags was used as an index of durability. The results are shown in Tables 1 to 4.
The maximum number of times the bag was dropped was 20 times, and if the bag was not dropped after 20 times, the subsequent bag drop test was not performed, and the number of times the bag was dropped was 20 times.

<Evaluation of gas barrier properties>
For the packages obtained in Examples 1 to 10, Comparative Examples 1 to 2, and Reference Example 1, 30 g of calcium chloride was added, and after removing as much air as possible, the upper ends of the pair of body members were heat-sealed. Calcium chloride was sealed therein to obtain a first test sample.
This first test sample was stored in an environment of 40° C. and 90%, and the state of calcium chloride was checked after storage for one month, and the presence or absence of deliquescence of calcium chloride was examined. The presence or absence of deliquescence of this calcium chloride was used as an index of gas barrier properties. The results are shown in Tables 1 to 4. Note that if there is deliquescence, the infiltration of moisture into the first test sample is not suppressed, and the gas barrier properties of the first test sample are not good.

<Evaluation of sealability of packaged products>
For the packages obtained in Examples 1 to 10, Comparative Examples 1 to 2, and Reference Example 1, 20 ml of penetrating liquid (Color Check, manufactured by Taseto Co., Ltd.) was sealed from the opening and spread throughout the package to form a packaged product. A second test sample was obtained. After 5 minutes had elapsed, the second test sample was observed from the outside to check for seepage of the penetrant, and the presence or absence of seepage of the penetrant was taken as an index of sealability.

From the results shown in Tables 1 to 4, it was found that the packaging bodies of Examples 1 to 10 could have a high mass ratio of paper base material. Further, all of the first test samples obtained by sealing calcium chloride in the packages of Examples 1 to 10 were "no deliquesce". In contrast, the first test samples obtained by sealing calcium chloride in the packages of Comparative Examples 1 and 2 were "deliquescent" or "slightly deliquescent." Therefore, it was found that the packages of Examples 1 to 10 had higher gas barrier properties than Comparative Examples 1 and 2. Furthermore, all of the second test samples obtained by enclosing the penetrating liquid in the packages of Examples 1 to 10 had "no penetration". On the other hand, the second test samples obtained by sealing calcium chloride in the packages of Comparative Examples 1 and 2 had "penetration". Therefore, it was found that the packages of Examples 1 to 10 were able to improve the sealing performance of the second test sample compared to Comparative Examples 1 and 2.

From the above, according to the package of the present disclosure, it is possible to improve the gas barrier properties and durability while increasing the mass ratio of the paper base material, and the sealing property of the packaged product obtained by sealing the contents. It was confirmed that it is possible to improve

DESCRIPTION OF SYMBOLS 10... Trunk member, 10a... Main body part, 10b... Bottom part, 11, 21... Paper base material, 12, 22... Anchor coat layer, 13, 23... Vapor deposition layer, 14, 24... Heat seal layer, 15, 25... Adhesion agent layer, 16, 26... overcoat layer, 20... bottom member, 30A... first seal part, 30B... second seal part, 100... package, 200... packaged product, X... intersection, T1... of body member Thickness of heat-sealing layer, T2... Thickness of heat-sealing layer of bottom member, C... Contents.

Claims

A bottom member is inserted in a bent state between a pair of body members having a body portion and a bottom portion, and the peripheral edges of the body portions of the pair of body members are heat-sealed to form a first sealed portion. , a standing pouch-shaped package formed by heat-sealing a peripheral edge of the bottom of the pair of body members and a peripheral edge of the bottom member to form a second sealed part,
The body member and the bottom member include, in this order, a paper base material, an anchor coat layer, a vapor deposition layer containing a metal or a metal oxide, and a heat seal layer,
The first seal portion is formed by heat sealing the heat seal layers of the pair of body members,
The second seal portion is formed by heat sealing the heat seal layer of the body member and the heat seal layer of the bottom member,
The thickness of the heat seal layer of the body member is in the range of 2 to 5 μm,
The ratio of the thickness of the heat seal layer of the bottom member to the thickness of the heat seal layer of the body member is 5 or more,
A packaging body in which the mass ratio of the paper base material to the total mass of the packaging body is 70% by mass or more.
The package according to claim 1, wherein no gap is formed at the intersection between the first seal part and the second seal part.
The heat-sealing layer of the body member is formed by coating and drying an aqueous dispersion in which a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group is dispersed in water as a resin component. Consists of the resulting coating film,
The package according to claim 1, wherein the heat seal layer of the bottom member is a polyolefin film.
The package according to claim 3, further comprising an adhesive layer between the vapor deposition layer and the heat seal layer in the bottom member.
The package according to claim 4, further comprising an overcoat layer between the vapor deposition layer and the adhesive layer in the bottom member.
The package according to claim 5, wherein the overcoat layer contains a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group.
The package of claim 1, wherein the ratio of the thickness of the paper substrate of the bottom member to the total thickness of the heat seal layer of the body member and the heat seal layer of the bottom member is greater than 0.5. body.
The packaging according to claim 7, wherein the ratio of the thickness of the paper base material of the bottom member to the total thickness of the heat seal layer of the body member and the heat seal layer of the bottom member is 5.0 or less. body.
The package according to claim 1, wherein in the trunk member and the bottom member, the anchor coat layer contains a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group.
The package according to claim 1, wherein in the trunk member and the bottom member, the anchor coat layer contains polyvinyl alcohol.
The package according to claim 1, wherein in the trunk member and the bottom member, the anchor coat layer contains a polyurethane resin.
The package according to claim 1, wherein the ratio of the thickness of the heat seal layer of the bottom member to the thickness of the heat seal layer of the body member is 100 or less.
The package according to claim 1, wherein the paper base material is uncoated paper without a coating layer.
A packaged product obtained by sealing the contents in the package according to claim 1.