Packaging body and packaging product

Abstract

The packaging body is formed by inserting a bottom member between a pair of main members in a bent state, forming a first sealing part by heat-sealing the peripheral parts of the main body parts of the pair of main members, and forming a second sealing part by heat-sealing the peripheral parts of the bottom parts of the pair of main members and the peripheral parts of the bottom member. The trunk member and the bottom member are each provided with a paper base material, a tackifying coating layer, a vapor deposition layer, and a heat sealing layer. The first sealing portion is formed by heat-sealing the heat-sealing layers of the pair of main members to each other, and the second sealing portion is formed by heat-sealing the heat-sealing layers of the main members and the heat-sealing layer of the bottom member. The thickness of the heat-sealing layer of the main member is 2-5 [mu] m, the ratio of the thickness of the heat-sealing layer of the bottom member / the thickness of the heat-sealing layer of the main member is 5 or more, and the mass ratio of the paper base material to the total mass of the packaging body is 70% by mass or more.

Description

Technical Field

[0001] The present invention relates to a packaging body and a packaging product. Background Art

[0002] Conventionally, as a packaging bag, there is known a packaging body in the shape of a standing bag obtained by using a pair of trunk members and a bottom member and forming the bag by heat sealing.

[0003] As such a packaging body, for example, the following self-supporting packaging bag is known, which is a self-supporting bag-shaped packaging bag formed by overlapping two laminated bodies whose main material is paper constituting the main body in a mutually opposite manner with heat-sealable thermoplastic resin surfaces, and folding the bottom formed by the bottom film into a V-shape and heat-sealing the periphery, wherein the laminated body has a main body and an outer bottom plate, the inner surface of the main body is sealed with the bottom film sealing part to form an inner bottom, and the outer bottom plates of the laminated body are respectively bent inwardly and the inner surface and the outer surface are bonded to form an outer bottom (for example, refer to the following patent document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-73714 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, in recent years, due to the increase in environmental awareness caused by the problem of marine plastic waste, the opportunity to eliminate plastics has risen. Therefore, even in a self-supporting bag-shaped package, it is required to increase the mass ratio of the paper base material in the trunk member and the bottom member.

[0009] However, the packaging bag described in Patent Document 1 has the following problems.

[0010] That is, the packaging bag described in the above Patent Document 1 has room for improvement in terms of gas barrier properties and durability when the mass ratio of the paper base material is increased. In addition, the packaging bag described in the above Patent Document 1 has room for improvement in terms of improving the sealing properties of the packaged product obtained by sealing the contents when the mass ratio of the paper base material is increased.

[0011] The present disclosure has been made in view of the above problems, and an object thereof is to provide a packaging body and a packaging product which can improve the gas barrier properties and durability while increasing the mass ratio of a paper base material, and can also improve the sealing properties of the packaging product obtained by sealing the content.

[0012] Means for solving problems

[0013] In order to solve the above-mentioned problems, one aspect of the present disclosure provides a packaging body, which is a packaging body in the shape of a self-supporting bag formed by the following steps: inserting a bottom member in a bent state between a pair of trunk members having a main body and a bottom, heat-sealing the peripheral portions of the main body of the pair of trunk members to each other to form a first sealed portion, and heat-sealing the peripheral portions of the bottoms of the pair of trunk members to the peripheral portion of the bottom member to form a second sealed portion, wherein the trunk member and the bottom member sequentially include a paper substrate, an adhesion coating, a vapor-deposited layer containing a metal or a metal oxide, and a heat-sealing layer, the first sealed portion is formed by heat-sealing the heat-sealing layers of the pair of trunk members to each other, and the second sealed portion is formed by heat-sealing the heat-sealing layer of the trunk member to the heat-sealing layer of the bottom member, the thickness of the heat-sealing layer of the trunk member is in the range of 2 to 5 μm, the ratio of the thickness of the heat-sealing layer of the bottom member to the thickness of the heat-sealing layer of the trunk member is 5 or more, and the mass ratio of the paper substrate to the total mass of the packaging body is 70 mass % or more.

[0014] The packaging body can improve the gas barrier properties and durability while increasing the mass ratio of the paper base material, and can also improve the sealing properties of the packaged product obtained by sealing the content.

[0015] The reason why the above-mentioned effects are obtained is presumed as follows.

[0016] That is, if the thickness of the heat seal layer of the pair of trunk components is reduced to 2 to 5 μm, and the ratio of the thickness of the heat seal layer of the bottom component to the thickness of the heat seal layer of the trunk component is set to 5 or more, the mass ratio of the paper substrate to the total mass of the packaging body can be increased because the surface area of ​​the pair of trunk components accounts for a large proportion in the packaging body. In addition, in the packaging body, by setting the ratio of the thickness of the heat seal layer of the bottom component to the thickness of the heat seal layer of the trunk component to 5 or more, the gas barrier property of the bottom component can be improved compared with the case where the ratio is less than 5. In addition, when the peripheral portions of the main body of the pair of trunk components are heat-sealed to each other to form a first seal portion, and the peripheral portions of the bottom of the pair of trunk components are heat-sealed to the peripheral portions of the bottom component to form a second seal portion, since the heat seal layer of the bottom component, which is sufficiently larger than the thickness of the trunk component, is melted, the space at the intersection of the first seal portion and the second seal portion of the packaging body, which is easy to form a gap due to the height difference, is fully filled with the melted heat seal layer and it is difficult to form a gap. Therefore, in the packaging product obtained by sealing the contents in the packaging body, leakage of the contents from the gap can be suppressed, and the sealing performance of the packaging product can be improved. Furthermore, since it is difficult to generate a gap at the intersection of the first sealing part and the second sealing part of the packaging body, even if the packaging product obtained by sealing the contents in the packaging body is impacted by falling, it is easy to suppress peeling on the first sealing part and peeling on the second sealing part starting from the gap. Therefore, the packaging body of the present disclosure can also improve durability.

[0017] In the above-mentioned package, preferably, no gap is formed at an intersection of the first seal portion and the second seal portion.

[0018] In this case, since there is no gap formed at the intersection of the first sealing part and the second sealing part, in the packaging product obtained by sealing the contents in the packaging body, leakage of the contents from the gap can be further suppressed, and the sealing performance of the packaging product can be further improved. In addition, even if the packaging product obtained by sealing the contents in the packaging body is impacted by falling, it is easier to suppress peeling on the first sealing part and peeling on the second sealing part starting from the gap. Therefore, the packaging body of the present disclosure can further improve the durability.

[0019] In the above-mentioned packaging body, the heat-sealing layer of the main body component is formed by a coating film obtained by coating and drying an aqueous dispersion, wherein the aqueous dispersion is formed by dispersing a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group (hereinafter sometimes also referred to as "carboxyl group / salt of carboxyl group") as a resin component in water, and the heat-sealing layer of the bottom component can be a polyolefin film.

[0020] In this case, the heat seal layer is obtained by applying and drying a water dispersion, wherein the water dispersion is formed by dispersing a polyolefin in a salt having a carboxyl group / carboxyl group in water as a resin component, thereby improving the easy opening property of the package. In addition, the heat seal layer can be formed very thin, and it is easy to increase the mass ratio of the paper substrate in the total mass of the package. In addition, by making the heat seal layer of the bottom member a polyolefin film, the strength of the bottom member is further improved compared to the case where the heat seal layer is the above-mentioned coating, and even if the bottom member is bent on the package, the gas barrier property can be further improved.

[0021] In the above packaging body, when the heat seal layer is a polyolefin film, an adhesive layer may be further provided on the bottom member between the vapor-deposited layer and the heat seal layer.

[0022] In this case, the adhesion between the vapor-deposited layer and the heat-sealing layer can be improved, and the separation between the vapor-deposited layer and the heat-sealing layer can be suppressed.

[0023] In the above-mentioned packaging body, the bottom member may further include an outer coating layer between the vapor-deposited layer and the adhesive layer.

[0024] In the above packaging body, the outer coating layer may include a polyolefin having at least one selected from the group consisting of a carboxyl group and a salt of a carboxyl group.

[0025] In the above packaging body, a ratio of a thickness of the paper base material of the bottom member to a total thickness of the heat-sealing layer of the trunk member and the heat-sealing layer of the bottom member may be greater than 0.5.

[0026] In this case, it is easy to increase the mass ratio of the paper base material in the total mass of the package.

[0027] In the above-mentioned package, the ratio of the thickness of the paper base material of the bottom member to the total thickness of the heat-sealing layer of the trunk member and the heat-sealing layer of the bottom member may be 5.0 or less.

[0028] In the above packaging body, on the trunk member and the bottom member, the adhesion-promoting coating layer may include a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group.

[0029] In this case, since the anchor coating layer is excellent in flexibility, even if the trunk member and the base member are bent, the deposited layer can be prevented from breaking, and the adhesion between the anchor coating layer and the deposited layer can be further improved.

[0030] In the above-mentioned packaging body, the above-mentioned adhesion-promoting coating layer on the above-mentioned trunk member and the above-mentioned bottom member may contain polyvinyl alcohol.

[0031] In this case, since the anchor coating layer is excellent in flexibility, even if the trunk member and the base member are bent, the deposited layer can be prevented from breaking, and the adhesion between the anchor coating layer and the deposited layer can be further improved.

[0032] In the above-mentioned packaging body, in the above-mentioned trunk member and the above-mentioned bottom member, the above-mentioned anchor coating layer may contain a polyurethane-based resin.

[0033] In this case, the gas barrier properties of the package can be further improved.

[0034] In the above packaging body, the ratio of the thickness of the heat-sealing layer of the bottom member to the thickness of the heat-sealing layer of the trunk member may be 100 or less.

[0035] In the above packaging body, the paper substrate may be uncoated paper without a clay coating.

[0036] Another aspect of the present disclosure provides a packaging product, which is obtained by sealing contents in the above packaging body.

[0037] The packaging product can increase the mass ratio of the paper substrate in the total mass of the packaging body, improve the gas barrier properties and durability, and also improve the sealing properties.

[0038] Effects of the Invention

[0039] According to the present invention, there is provided a package and a packaging product capable of improving the gas barrier properties and durability while increasing the mass ratio of a paper base material, and capable of improving the sealing properties of the packaging product obtained by sealing the contents. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a front view showing one embodiment of the package body of the present disclosure.

[0041] Figure 2 is along Figure 1 Cross-sectional view along line II-II.

[0042] Figure 3 Yes means Figure 1 A cross-sectional view of the main trunk component.

[0043] Figure 4 Yes means Figure 1 sectional view of the bottom part.

[0044] Figure 5 Yes means Figure 1 A cross-sectional view of a modified example of a trunk component.

[0045] Figure 6 Yes means Figure 1 A cross-sectional view of a modified example of the bottom member.

[0046] Figure 7 1 is a front view showing one embodiment of the packaging product disclosed herein. DETAILED DESCRIPTION

[0047] Below, refer to Figure 1 to Figure 4 Embodiments of the package body of the present disclosure will be described in detail. Figure 1 is a front view showing one embodiment of the package body disclosed herein, Figure 2 is along Figure 1 The cross-sectional view of line II-II, Figure 3 Yes means Figure 1 A cross-sectional view of the main components of Figure 4 Yes means Figure 1 sectional view of the bottom part.

[0048] Figure 1 and Figure 2 The packaging body 100 shown is a packaging body in which a bottom component 20 is inserted in a bent state between a pair of main components 10 having a main body 10a and a bottom 10b, the peripheral portions of the main body 10a of the pair of main components 10 are heat-sealed to each other to form a first sealing portion 30A, and the peripheral portions of the bottom 10b of the pair of main components 10 are heat-sealed to the peripheral portion of the bottom component 20 to form a second sealing portion 30B.

[0049] like Figure 3 As shown, a pair of trunk components 10 sequentially include a paper substrate 11, an adhesion promoter coating 12, a vapor-deposited layer 13 containing a metal or metal oxide, and a heat seal layer 14. The thickness T1 of the heat seal layer 14 of the trunk component 10 is in the range of 2 to 5 μm.

[0050] like Figure 4 As shown, the bottom component 20 comprises a paper substrate 21, an adhesion-enhancing coating 12, a vapor-deposited layer 23 containing a metal or a metal oxide, and a heat-sealing layer 24 in sequence, and a ratio R (T2 / T1) of a thickness T2 of the heat-sealing layer 24 of the bottom component 20 to a thickness T1 of the heat-sealing layer 14 of the trunk component 10 is greater than 5.

[0051] The first sealed portion 30A is formed by heat-sealing the heat-sealing layers 14 of the pair of trunk members 10 to each other, and the second sealed portion 30B is formed by heat-sealing the heat-sealing layer 14 of the trunk member 10 to the heat-sealing layer 24 of the bottom member 20 .

[0052] Furthermore, the mass ratio of the paper substrates 11 and 21 to the total mass of the package 100 is 70 mass % or more.

[0053] The package 100 can improve the gas barrier properties and durability while increasing the mass ratio of the paper substrates 11 and 21, and can also improve the sealing properties of the packaged product obtained by sealing the content.

[0054] Hereinafter, the mass ratios of the trunk member 10 , the bottom member 20 , and the paper base material in the total mass of the package 100 will be described in detail.

[0055] <Main Components>

[0056] As described above, the trunk member 10 includes the paper substrate 11 , the anchor coating layer 12 , the vapor-deposited layer 13 , and the heat-sealing layer 14 in this order.

[0057] (Paper substrate)

[0058] The paper substrate 11 is not particularly limited as long as it is a substrate 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 trunk member 10 with the paper substrate 1, it can help reduce the amount of plastic material used.

[0059] Specific examples of the paper substrate 11 include high-quality paper, special high-quality paper, coated paper, art paper, cast-coated paper, molded paper, kraft paper, and glassine paper.

[0060] The weight per unit area of ​​the paper substrate 11 is not particularly limited, and can be, for example, 20 g / m 2 Above, can also be 30g / m 2 However, from the viewpoint of the self-supporting property of the package body 100, 30 g / m 2 In addition, the weight per unit area of ​​the paper substrate 11 can be 500 g / m 2 Below, can also be 100g / m 2 the following.

[0061] The paper substrate 11 may also have a coating at least on the side of the adhesion-promoting coating 12 of the paper. By making the paper substrate 11 also have a coating, in addition to preventing the adhesion-promoting coating 12 from penetrating into the paper, the gas barrier property can also be improved, and the function of a filler for filling the unevenness of the paper can be played, and the adhesion-promoting coating 12 can be made into a film without defects and evenly. The coating may further contain an adhesive resin and a filler used as needed. As the adhesive resin, various copolymers such as styrene-butadiene copolymer, styrene-acrylic acid copolymer, ethylene-vinyl acetate copolymer, polyvinyl alcohol resin, cellulose resin, etc. can be listed. As fillers, kaolin, calcium carbonate, talc, mica, etc. can be listed.

[0062] The thickness of the coating layer is not particularly limited, but may be, for example, 1 μm or more, or 3 μm or more. The thickness of the coating layer may be 10 μm or less, or 8 μm or less.

[0063] The paper substrate 11 may be made of paper alone. That is, the paper substrate 11 may be uncoated paper without a coating layer.

[0064] (Adhesion Coating)

[0065] The anchor coating layer 12 is provided on the surface of the paper substrate 11 to improve the adhesion between the paper substrate 11 and the vapor-deposited layer 13 and to improve the gas barrier property of the trunk member 10 .

[0066] The adhesion coating 12 is not particularly limited and may include at least one of polyolefin having carboxyl groups / salts of carboxyl groups, polyvinyl alcohol, and polyurethane resins. In the case where the adhesion coating 12 includes at least one of polyolefin having carboxyl groups / salts of carboxyl groups and polyvinyl alcohol, the adhesion coating 12 has excellent flexibility, and even if the trunk member 10 is bent, the rupture of the vapor-deposited layer 13 can be suppressed, and the adhesion between the paper substrate 11 and the vapor-deposited layer 13 can be improved. In the case where the adhesion coating 12 contains a polyurethane resin, the gas barrier properties of the package 100 can be further improved.

[0067] In particular, if anchor coating layer 12 contains the above-mentioned polyolefin, anchor coating layer 12 can be formed into a dense film by utilizing the crystallinity of polyolefin. In addition, since polyolefin has few polar groups, the water vapor barrier property of trunk member 10 can be improved.

[0068] In addition, when the anchor coating layer 12 contains the above-mentioned polyvinyl alcohol, the oxygen barrier property of the trunk member 10 can be further improved.

[0069] When the anchor coating layer 12 includes a polyolefin having a carboxyl group / a salt of a carboxyl group, as the polyolefin, a polyolefin obtained by copolymerizing an olefin such as ethylene or propylene with an unsaturated compound such as acrylic acid, methacrylic acid, or maleic anhydride can be 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, copolymers of ethylene and maleic anhydride, etc. can be cited.

[0070] Examples of the polyvinyl alcohol include completely saponified polyvinyl alcohol, partially saponified polyvinyl alcohol, modified polyvinyl alcohol, and ethylene-vinyl alcohol copolymer resins. The degree of polymerization of the polyvinyl alcohol is preferably 300 to 1500. If the degree of polymerization is 300 or more, the barrier properties and bending resistance of the trunk member 10 are improved, and if the degree of polymerization is 1500 or less, the viscosity of the polyvinyl alcohol coating liquid is reduced, and the coating property is improved.

[0071] There is no particular limitation on the polyurethane resin as long as it is a resin having a carbamate bond, but from the viewpoint of barrier properties, it is preferred to contain at least one of a structural unit derived from meta-xylene diisocyanate and a structural unit derived from hydrogenated meta-xylene diisocyanate. By making the polyurethane resin contain the above-mentioned structural unit, high cohesion is exhibited due to the stacking effect of hydrogen bonds and phenylene dimethyl groups, so the gas barrier properties tend to be further improved. As a coating liquid used when forming an adhesion-promoting coating containing a polyurethane resin, from the viewpoint of coating properties, a coating liquid dispersed in water such as a dispersion or an emulsion is preferred. As the above-mentioned coating liquid, for example, Takelac WPB manufactured by Mitsui Chemicals can be cited.

[0072] The anchor coating 12 may contain other components in addition to the above-mentioned polyolefin, polyvinyl alcohol or polyurethane resin. Examples of other components include polyolefins other than the above-mentioned polyolefins, silane coupling agents, organic titanates, polyacrylic acids, polyesters, polyurethanes, polycarbonates, polyureas, polyamides, polyimides, melamine, phenols, and the like.

[0073] The content of polyolefin or polyvinyl alcohol in anchor coating 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.

[0074] The thickness of the adhesion coating layer 12 can be, for example, 1 μm or more, 2 μm or more, or 20 μm or less. In addition, the thickness of the adhesion coating layer 12 can be 10 μm or less, or 5 μm or less. If the thickness of the adhesion coating layer 12 is 1 μm or more, the above-mentioned unevenness of the paper substrate 11 can be effectively buried, and the vapor-deposited layer 13 can be uniformly stacked. In addition, if the thickness of the adhesion coating layer 12 is 20 μm or less, the vapor-deposited layer 13 can be uniformly stacked while suppressing the cost.

[0075] As a method for forming the adhesion-enhancing coating layer 12, a coating liquid containing at least the above-mentioned polyolefin or polyvinyl alcohol and a solvent can be applied to the paper substrate 11 and dried. From the viewpoint of making the dried coating surface smooth, evenly laminating the vapor-deposited layer 13, and improving the barrier properties, the smaller the average particle size of the polyolefin or polyvinyl alcohol in the coating liquid, the better. Specifically, the average particle size of the polyolefin or polyvinyl alcohol in the coating liquid can be less than 1 μm, less than 0.7 μm, or less than 0.5 μm. The lower limit of the average particle size of the polyolefin or polyvinyl alcohol is not particularly limited, but can be, for example, 1 nm.

[0076] As the solvent contained in the above-mentioned coating liquid, for example, water, methanol, ethanol, isopropanol, n-propanol, n-butanol, n-pentanol, dimethyl sulfoxide, dimethylformamide, dimethylacetamide, toluene, hexane, heptane, cyclohexane, acetone, methyl ethyl ketone, diethyl ether, dioxane, tetrahydrofuran, ethyl acetate, butyl acetate can be listed. The above-mentioned solvent can be used alone or in combination of two or more. Among them, from the viewpoint of characteristics, methanol, ethanol, isopropanol, toluene, ethyl acetate, methyl ethyl ketone, and water are preferred. In addition, from the viewpoint of environment, methanol, ethanol, isopropanol, and water are preferred.

[0077] (Evaporated layer)

[0078] The vapor deposition layer 13 contains a metal or a metal oxide. The vapor deposition layer 13 is a layer obtained by vapor deposition of a metal or a metal oxide. Examples of the metal include aluminum (Al). Examples of the metal oxide include aluminum oxide (AlO). x ), silicon oxide (SiO x ) and other inorganic oxides.

[0079] The thickness of the vapor-deposited layer 13 can be appropriately set according to the use of the package 100, 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 curling and cracking of the vapor-deposited layer 13 can be fully suppressed, and sufficient gas barrier performance and flexibility can be easily achieved.

[0080] From the viewpoint of oxygen barrier performance and film uniformity, the vapor deposition layer 13 is preferably formed by a vacuum film forming method. Vacuum film forming methods include well-known methods such as vacuum evaporation, sputtering, and chemical vapor deposition (CVD), but from the viewpoint of fast film forming speed and high productivity, vacuum evaporation is preferred. In addition, among vacuum evaporation methods, especially film forming methods based on electron beam heating, it is effective because the film forming speed can be easily controlled by the irradiation area or electron beam current, and the temperature increase and decrease of the evaporation material can be performed in a short time.

[0081] (Heat seal layer)

[0082] The heat seal layer 14 may be a layer having heat sealability. The heat seal layer 14 may protect the vapor deposited layer 13 by sandwiching the vapor deposited layer 13 together with the adhesion promoter coating layer 12 .

[0083] The material constituting the heat seal layer 14 is not particularly limited, but may be, for example, a coating film (heat seal varnish) obtained by applying and drying an aqueous dispersion in which a polyolefin having a carboxyl group or a salt of a carboxyl group is dispersed in water as a resin component.

[0084] In this case, the heat seal layer 14 is a coating film obtained by applying and drying an aqueous dispersion in which a polyolefin having a carboxyl group or a salt of a carboxyl group is dispersed in water as a resin component, thereby improving the easy opening property of the package 100. In addition, the heat seal layer 14 can be formed thinner, and the mass ratio of the paper substrate in the total mass of the package 100 can be easily increased.

[0085] Examples of the polyolefin having a carboxyl group / a salt of a carboxyl group include polyolefins obtained by copolymerizing a salt of an olefin such as ethylene or propylene with an unsaturated carboxylic acid (an unsaturated compound having a carboxyl group such as acrylic acid, methacrylic acid, or maleic anhydride).

[0086] The heat seal layer 14 may be a polyolefin film.

[0087] The polyolefin film contains polyolefin. The polyolefin may or may not have a carboxyl group / a salt of a carboxyl group. As polyolefin, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-vinyl acetate copolymer, propylene homopolymer, ethylene-propylene block copolymer, ethylene-propylene random copolymer, etc. can be cited. They can be used alone or in combination of two or more.

[0088] The content of the 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.

[0089] The heat seal layer 14 may contain other components in addition to the above-mentioned polyolefin. As other components, for example, adhesion imparting agents such as silane coupling agents and organometallic compounds, various defoamers, leveling agents, etc. can be listed. In addition, in order to impart slidability and anti-blocking properties, the heat seal layer 14 may contain additives such as wax.

[0090] The thickness of the heat seal layer 14 is in the range of 2 to 5 μm. When the thickness of the heat seal layer 14 is 2 μm or more, the sealing strength of the first seal portion 30A and the second seal portion 30B can be further improved compared to the case where the thickness of the heat seal layer 14 is less than 2 μm, and the durability of the package 100 can be improved. When the thickness of the heat seal layer 14 is 5 μm or less, the mass ratio of the paper substrates 11 and 21 in the total mass of the package 100 can be further increased compared to the case where the thickness of the heat seal layer 14 exceeds 5 μm. In addition, when the heat seal layer 14 is a coating film obtained by coating and drying a water dispersion, wherein the water dispersion is formed by dispersing a polyolefin having a carboxyl group / a salt of a carboxyl group in water as a resin component, it is easy to apply the water dispersion of the polyolefin.

[0091] 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. Alternatively, the thickness of the heat seal layer 14 may be 4.5 μm or less, or 4 μm or less.

[0092] The heat seal layer 14 may be composed of a single layer or a plurality of layers.

[0093] (Adhesive layer)

[0094] In the case where the heat seal layer 14 of the main body component 10 is a polyolefin film, Figure 5 As shown, an adhesive layer 15 may be provided between the vapor deposited layer 13 and the heat seal layer 14. In this case, the adhesion between the vapor deposited layer 13 and the heat seal layer 14 can be improved, and the separation between the vapor deposited layer 13 and the heat seal layer 14 can be suppressed.

[0095] The adhesive layer 15 is a layer containing an adhesive. The adhesive is not particularly limited, and examples of the adhesive include two-component curing polyurethane adhesives.

[0096] The adhesive may be an adhesive having a gas barrier property.

[0097] The thickness of the adhesive layer 15 is not particularly limited, but is preferably 1 to 5 μm.

[0098] (Outer coating)

[0099] like Figure 5 As shown, the trunk component 10 may further have an outer coating 16 between the vapor-deposited layer 13 and the adhesive layer 15. The outer coating 16 is not particularly limited, and the same material as the adhesion coating 12 may be used. The outer coating 16 has excellent flexibility, and can inhibit the rupture of the vapor-deposited layer 13 together with the adhesion coating 12 even if the trunk component 10 is bent, and can further improve the gas barrier property of the trunk component 10.

[0100] The material comprising outer coating 16 may be the same as or different from the material comprising adhesion promoting coating 12 .

[0101] <Bottom Part>

[0102] As described above, the bottom member 20 includes the paper substrate 21, the anchor coating layer 22, the vapor-deposited layer 23, and the heat-sealing layer 24 in this order.

[0103] (Paper substrate)

[0104] As the paper substrate 21, the same paper substrate as the paper substrate 11 can be used. The paper substrate 21 may be the same as or different from the paper substrate 11 in terms of material, thickness, basis weight, etc.

[0105] The ratio P of the thickness of the paper substrate 21 of the bottom member 20 to the total thickness (T1+T2) of the heat seal layer 14 of the trunk member 10 and the heat seal layer 24 of the bottom member 20 is not particularly limited and may be less than 0.5 or greater than 0.5, but is preferably greater than 0.5.

[0106] In this case, it is easy to increase the mass ratio of the paper substrates 11 and 21 in the total mass of the package 100 .

[0107] The above ratio P may be 0.8 or more, 1.0 or more, 1.1 or more, or 1.2 or more. The above 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.

[0108] (Adhesion Coating)

[0109] As the adhesion coating 22, the same adhesion coating as the adhesion coating 12 can be used. In terms of material, thickness, etc., the adhesion coating 22 can be the same as the adhesion coating 12, or can be different. .

[0110] (Evaporated layer)

[0111] As the vapor-deposited layer 23, the same vapor-deposited layer as the vapor-deposited layer 13 can be used. The vapor-deposited layer 23 may be the same as or different from the vapor-deposited layer 13 in terms of material, thickness, and the like.

[0112] (Heat seal layer)

[0113] As the heat seal layer 24, the same heat seal layer as the heat seal layer 14 can be used.

[0114] 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 trunk member 10 is greater than 5. In this case, compared with the case where the ratio R is less than 5, when the peripheral portions of the main body portions 10a of the pair of trunk members 10 are heat-sealed to each other to form the first seal portion 30A, and the peripheral portions of the bottom portions 10b of the pair of trunk members 10 are heat-sealed to the peripheral portion of the bottom member 20 to form the second seal portion 30B, since the heat seal layer 24 of the bottom member 20 having a thickness sufficiently greater than that of the trunk member 10 is melted, the melted heat seal layer 24 fully fills the space at the intersection X of the first seal portion 30A and the second seal portion 30B of the package body 100, and it becomes difficult to generate a gap.

[0115] The ratio R may be 7 or more, 8 or more, 10 or more, 13 or more, or 15 or more. In addition, 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.

[0116] The heat seal layer 24 may be a coating film obtained by applying and drying an aqueous dispersion formed by dispersing a polyolefin having a carboxyl group / a salt of a carboxyl group in water as a resin component, or a polyolefin film, but preferably a polyolefin film. In this case, by making the heat seal layer 24 of the bottom member 20 a polyolefin film, the strength of the bottom member 20 is further improved compared to the case where the heat seal layer 24 is the above-mentioned coating film, and even if the bottom member 20 is bent in the package body 100 and has a bent portion 20a, the gas barrier property of the bent portion 20a can be further improved.

[0117] In addition, the polyolefin contained in the heat seal layer 24 may be the same as or different from the polyolefin contained in the heat seal layer 14 of the trunk member 10, but 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 trunk 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 sealing portion 30B.

[0118] (Adhesive layer)

[0119] In the case where the heat seal layer 24 is a polyolefin film, Figure 6 As shown, the bottom member 20 may further include an adhesive layer 25 between the vapor deposited layer 23 and the heat seal layer 24. In this case, the adhesion between the vapor deposited layer 23 and the heat seal layer 24 can be improved, and the separation between the vapor deposited layer 23 and the heat seal layer 24 can be suppressed.

[0120] The adhesive layer 25 is a layer containing an adhesive. The adhesive is not particularly limited, but examples of the adhesive include two-component curing polyurethane adhesives.

[0121] The adhesive may be an adhesive having a gas barrier property.

[0122] The thickness of the adhesive layer 25 is not particularly limited, but is preferably 1 to 5 μm.

[0123] (Outer coating)

[0124] like Figure 6 As shown, the bottom member 20 may further have an outer coating layer 26 between the vapor-deposited layer 23 and the adhesive layer 25. The outer coating layer 26 is not particularly limited, and the same material as the adhesion coating layer 22 may be used. The above-mentioned outer coating layer 26 has excellent flexibility, and can suppress the rupture of the vapor-deposited layer 23 together with the adhesion coating layer 22 even if the bottom member 20 is bent, and can further improve the gas barrier property of the bottom member 20.

[0125] The material constituting the outer coating layer 26 may be the same as the material constituting the adhesion promoting coating layer 22 or may be different.

[0126] <Mass ratio of paper substrate to total mass of package>

[0127] The mass ratio of the paper substrates 11 and 21 to the total mass of the package 100 may be 70% or more, but may be 75% or more, or 80% or more, or 100% or less, or 95% or less.

[0128] <Packaging Products>

[0129] Next, we will use Figure 7 Embodiments of the packaging product of the present disclosure will be described. Figure 7 1 is a front view showing one embodiment of the packaging product disclosed herein.

[0130] Figure 7 The packaged product 200 shown is obtained by sealing the content C in the package body 100 .

[0131] The packaging product 200 can improve the gas barrier property and durability, and can also improve the sealing property while increasing the mass ratio of the paper substrates 11 and 21 in the total mass of the packaging body 100. After the packaging body 100 contains the content C, the upper sides of the openings forming the pair of trunk members 10 can be heat-sealed to seal the content C.

[0132] Examples of the content C include food, medicines, liquids, and electronic components.

[0133] In addition, the outline of the present disclosure is as follows.

[0134] [1] A packaging body, which is a self-supporting bag-shaped packaging body formed by the following steps: inserting a bottom member in a bent state between a pair of trunk members having a main body and a bottom, heat-sealing the peripheral portions of the main body of the pair of trunk members to each other to form a first sealed portion, and heat-sealing the peripheral portions of the bottom of the pair of trunk members to the peripheral portion of the bottom member to form a second sealed portion, wherein the trunk members and the bottom member have a paper substrate, an adhesion-promoting coating, a vapor-deposited layer containing a metal or a metal oxide, and a heat-sealing layer in this order, the first sealed portion is formed by heat-sealing the heat-sealing layers of the pair of trunk members to each other, and the second sealed portion is formed by heat-sealing the heat-sealing layer of the trunk member to the heat-sealing layer of the bottom member, the thickness of the heat-sealing layer of the trunk member is in the range of 2 to 5 μm, the ratio of the thickness of the heat-sealing layer of the bottom member to the thickness of the heat-sealing layer of the trunk member is 5 or more, and the mass ratio of the paper substrate to the total mass of the packaging body is 70 mass % or more.

[0135] [2] The package body according to [1], wherein no gap is formed at an intersection of the first seal portion and the second seal portion.

[0136] [3] A packaging body according to [1] or [2], wherein the heat-sealing layer of the trunk member is formed by a coating film obtained by applying and drying an aqueous dispersion, wherein the aqueous dispersion is formed by dispersing a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group as a resin component in water, and the heat-sealing layer of the bottom member is a polyolefin film.

[0137] [4] The packaging body according to [3], further comprising an adhesive layer between the vapor-deposited layer and the heat-sealing layer in the bottom member.

[0138] [5] The packaging body according to [4], further comprising an outer coating layer between the vapor-deposited layer and the adhesive layer in the bottom member.

[0139] [6] The packaging body according to [5], wherein the outer coating layer contains a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group.

[0140] [7] The packaging body according to any one of [1] to [6], wherein the ratio of the thickness of the paper substrate of the bottom member to the total thickness of the heat-sealing layer of the trunk member and the heat-sealing layer of the bottom member is greater than 0.5.

[0141] [8] The packaging body according to any one of [1] to [7], wherein the ratio of the thickness of the paper substrate of the bottom member to the total thickness of the heat-sealing layer of the trunk member and the heat-sealing layer of the bottom member is 5.0 or less.

[0142] [9] The packaging body according to any one of [1] to [8], wherein in the trunk member and the bottom member, the anchor coating layer contains a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group.

[0143]

[10] The packaging body according to any one of [1] to [8], wherein the anchor coating layer in the trunk member and the bottom member contains polyvinyl alcohol.

[0144]

[11] The packaging body according to any one of [1] to [8], wherein in the trunk member and the bottom member, the anchor coating layer contains a polyurethane-based resin.

[0145]

[12] The packaging body according to any one of [1] to

[11] , wherein a ratio of a thickness of the heat-sealing layer of the bottom member to a thickness of the heat-sealing layer of the trunk member is 100 or less.

[0146]

[13] The packaging body according to any one of [1] to

[12] , wherein the paper substrate is uncoated paper having no clay coating layer.

[0147]

[14] A packaged product obtained by sealing contents in the package body according to any one of [1] to

[13] .

[0148] Example

[0149] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to these examples.

[0150] (Example 1)

[0151] <Main body part production>

[0152] A clay-coated paper (weight per unit area 60 g / m2) was prepared in which a clay coating layer with a thickness of 5 μm was formed on one side of a 55 μm thick paper. 2 ) as a paper substrate, a coating liquid for forming an adhesion coating layer is applied to the clay coating layer of the clay-coated paper and dried to a thickness of 3 μm after drying, thereby forming an adhesion coating layer. At this time, as the coating liquid for forming an adhesion coating layer, an aqueous dispersion (Mitsui Chemicals, Inc., trade name: "Cemipal S500"; hereinafter also referred to as "polyolefin coating 1") is used, in which a polyolefin having a carboxyl group / a salt of a carboxyl group is dispersed in water as a resin component.

[0153] Then, an Al layer having a thickness of 50 nm was formed on the anchor coating layer by vacuum evaporation.

[0154] Next, a heat seal layer-forming coating liquid was applied on the surface of the Al layer and dried to a thickness of 3 μm to form a heat seal layer. At this time, the heat seal layer-forming coating liquid used was a polyolefin coating 1 that was the same as the above-mentioned anchor coating layer-forming coating liquid.

[0155] In this way, a trunk member having a size of 200 mm in length×150 mm in width was produced.

[0156] <Production of bottom part>

[0157] A clay-coated paper (weight per unit area 60 g / m2) was prepared in which a clay coating layer with a thickness of 5 μm was formed on one side of a 55 μm thick paper. 2 ) as a paper substrate, a coating liquid for forming an adhesion coating layer is applied to the clay coating layer of the clay-coated paper and dried to a thickness of 3 μm after drying, thereby forming an adhesion coating layer. At this time, as the coating liquid for forming an adhesion coating layer, the same polyolefin coating 1 as the coating liquid for forming an adhesion coating layer of the trunk member is used.

[0158] Then, an Al layer having a thickness of 50 nm was formed on the anchor coating layer by vacuum evaporation.

[0159] Next, an outer coating layer was formed by applying an outer coating layer-forming coating liquid on the Al layer and drying the coating liquid to a thickness of 3 μm after drying. At this time, an aqueous dispersion (polyolefin coating 1) in which a polyolefin having a carboxyl group / a salt of a carboxyl group was dispersed in water as a resin component was used as the outer coating layer-forming coating liquid.

[0160] Next, a polyurethane curing adhesive was applied as an adhesive on the surface of the outer coating layer so that the coating amount after drying was 2 μm, and a 40 μm thick LLDPE film was attached. At this time, as the polyurethane curing adhesive, a mixed solution obtained by mixing a polyester polyol as a main agent (Mitsui Chemicals, Inc., trade name: Takelac A525) and a polyisocyanate as a curing agent (Mitsui Chemicals, Inc., trade name: Takenate A52) and diluting with ethyl acetate was used.

[0161] In this way, a bottom member having a size of 150 mm in length×70 mm in width was produced.

[0162] <Production of a stand-up pouch-shaped package>

[0163] A standing pouch-shaped package is produced by using a pair of trunk members and one bottom member obtained as described above, using a common standing pouch-shaped package making machine.

[0164] Specifically, the heat-sealing layers of a pair of main parts are placed opposite to each other on the inner sides, and the bottom part is folded in half and inserted between them so that the heat-sealing layer is on the outer side. The peripheral portion of the bottom part and the peripheral portion of the bottom of the main part are heat-sealed to form a second sealed portion (bottom sealed portion), and the two side edges of the pair of main parts are heat-sealed to each other to form a first sealed portion (side edge sealed portion).

[0165] In addition, the upper end portions of the pair of trunk members are not heat-sealed to each other.

[0166] Thus, a packaging body in the shape of a self-supporting bag with a size of 200 mm long x 150 mm wide x 35 mm folded from the front and an opening at the top was produced. In addition, "folded" refers to the folding depth from the lower end of the trunk member to the bent portion of the bottom member.

[0167] In the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0168] (Example 2)

[0169] A packaging body was produced in the same manner as in Example 1 except that the outer coating layer was not formed when the bottom member was produced.

[0170] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0171] (Example 3)

[0172] Polyvinyl alcohol (PVA) with a degree of polymerization of 500 (manufactured by Kuraray Co., Ltd., trade name "Poval 5-98") is dissolved in a mixed solvent of water and isopropyl alcohol (IPA) (water / IPA = 90 / 10 (mass ratio)) to prepare a PVA coating liquid (solid content: 5 mass%). When making the bottom part and the trunk part, the above-mentioned PVA coating liquid is applied so that the thickness after drying is 3 μm to form a thickening coating. Except for this, the packaging body is made in the same manner as in Example 1.

[0173] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0174] (Example 4)

[0175] When making the bottom part and the trunk part, clay-coated paper (weight per unit area: 50 g / m2) was used, in which a clay coating layer with a thickness of 4 μm was formed on a paper with a thickness of 46 μm. 2 ) was used as the paper substrate and, when making the bottom member, a LLDPE film with a thickness of 30 μm was used as the heat seal layer. The packaging body was produced in the same manner as in Example 1.

[0176] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0177] (Example 5)

[0178] When making the bottom part and the trunk part, a clay-coated paper (weight per unit area: 50 g / m2) was used, in which a clay coating layer with a thickness of 4 μm was formed on a paper with a thickness of 46 μm. 2 ) was used as the paper substrate and, when making the bottom member, a LLDPE film with a thickness of 20 μm was used as the heat seal layer. The packaging body was made in the same manner as in Example 1.

[0179] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0180] (Example 6)

[0181] A package body was produced in the same manner as in Example 1 except that the thickness of the heat seal layer was set to 2.5 μm when producing the trunk member.

[0182] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0183] (Example 7)

[0184] A package body was produced in the same manner as in Example 1 except that the thickness of the heat seal layer was set to 4.8 μm when producing the trunk member.

[0185] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0186] (Example 8)

[0187] When making the bottom part and the main body part, the above-mentioned PU coating liquid, which is an aqueous dispersion of a polyurethane resin (PU) (manufactured by Mitsui Chemicals, trade name: "Takelac WPB-341", solid content concentration 30% by mass), is applied to form an adhesion-enhancing coating with a thickness of 3 μm after drying. Except for this, the packaging body is made in the same manner as in Example 1.

[0188] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0189] (Example 9)

[0190] When making the bottom part and the main body part, an aqueous dispersion (manufactured by Sumitomo Seika Chemicals, Ltd., trade name: "ザイクセン AC". Hereinafter also referred to as "polyolefin coating 2") is applied in which a polyolefin having a carboxyl group / salt of a carboxyl group is dispersed in water as a resin component so that the thickness after drying is 3 μm to form an adhesion-enhancing coating. Except for this, the packaging body is made in the same manner as in Example 1.

[0191] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0192] (Example 10)

[0193] When making the bottom and trunk parts, use 50μm thick kraft paper (weight per unit area: 50g / m 2 ) as the paper substrate, and otherwise, the packaging body was prepared in the same manner as in Example 3.

[0194] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0195] (Comparative Example 1)

[0196] When manufacturing the bottom part, only a heat seal layer with a thickness of 3 μm is formed on the Al vapor-deposited layer instead of forming an outer coating layer, an adhesive layer and a heat seal layer. The heat seal layer is formed using the coating liquid (polyolefin coating 1) for forming the heat seal layer used when manufacturing the main part. Except for this, the packaging body is manufactured in the same manner as in Example 1.

[0197] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and a gap was formed.

[0198] (Comparative Example 2)

[0199] A packaging body 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.

[0200] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and a gap was formed.

[0201] (Reference Example 1)

[0202] A packaging body was produced in the same manner as in Example 1 except that the bottom member of Example 2 was used as the trunk member.

[0203] In addition, in the obtained package body, the intersection of the first seal portion and the second seal portion was observed, and no gap was formed.

[0204] <Calculation of Mass Ratio of Paper Base Material>

[0205] The mass ratio A of the paper substrate in the total mass of the package was calculated according to the following formula. The results are shown in Tables 1 to 4.

[0206] A (mass %) = 100 × [mass of paper substrate (clay-coated paper) in bottom member B1 (g) + mass of paper substrate (clay-coated paper) in trunk member B2 × 2 (g)] / [mass of bottom member C1 (g) + mass of trunk member C2 × 2 (g)]

[0207] In addition, B1, B2, C1, and C2 are calculated using the following parameters.

[0208] Area of ​​bottom part S1 = 150 mm x 70 mm

[0209] ·Main component area S2 = 200mm × 150mm

[0210] Density of adhesion-enhancing coating (polyolefin coating 1): 1.0 g / cm 3

[0211] Density of adhesion-enhancing coating (polyolefin coating 2): 1.0 g / cm 3

[0212] Density of adhesion-enhancing coating (PVA film): 1.2 g / cm 3

[0213] ·Evaporation layer density: 2.7 (g / cm 3 )

[0214] Density of outer coating (polyolefin coating 1): 1.0 g / cm 3

[0215] Density of adhesive layer: 1.5 (g / cm 3 )

[0216] Density of heat seal layer (LLDPE): 0.9g / cm 3

[0217] Density of heat seal layer (polyolefin coating 1): 1.0 g / cm 3

[0218] <Durability Evaluation>

[0219] After 30 g of plastic resin was added as the contents from the opening of the package bodies obtained in Examples 1 to 10, Comparative Examples 1 to 2 and Reference Example 1, the upper ends of the trunk members of the package bodies were heat-sealed to seal the contents. Three test samples were prepared in this manner.

[0220] Then, each test sample was subjected to a bag drop test, i.e., it was dropped from a height of 100 cm above the ground, and the number of bag drops until it broke was counted. Then, the average number of bag drops of the three test samples was calculated as the number of bag drops, and the number of bag drops was used as an indicator of durability. The results are shown in Tables 1 to 4.

[0221] In addition, the maximum number of bag dropping was set to 20 times. If the bag dropping was not performed 20 times, the subsequent bag dropping test was not performed, and the number of bag dropping was set to 20 times.

[0222] <Evaluation of Gas Barrier Properties>

[0223] 30 g of calcium chloride was added to the packaging bodies obtained in Examples 1 to 10, Comparative Examples 1 to 2 and Reference Example 1, and after exhausting the air as much as possible, the upper ends of a pair of trunk members were heat-sealed to each other and calcium chloride was enclosed to obtain a first test sample.

[0224] The first test sample was stored at 40°C and 90% of the environment, and the state of calcium chloride after storage for 1 month was confirmed to investigate whether the calcium chloride was deliquesced. Whether the calcium chloride was deliquesced was used as an indicator of gas barrier properties. The results are shown in Tables 1 to 4. In addition, in the case of deliquescing, water intrusion into the first test sample was not suppressed, resulting in poor gas barrier properties of the first test sample.

[0225] <Evaluation of Sealing Properties of Packaged Products>

[0226] 20 ml of a permeation liquid (Caratich, manufactured by Taseto Co., Ltd.) was sealed from the opening of the package obtained in Examples 1 to 10, Comparative Examples 1 to 2, and Reference Example 1, so that it spread throughout the entire package to obtain a second test sample as a packaged product. After 5 minutes, the second test sample was observed from the outside to check whether the permeation liquid leaked out, and the presence or absence of the permeation liquid leaked out was used as an indicator of sealing performance.

[0227] Table 1

[0228]

[0229] Table 2

[0230]

[0231] Table 3

[0232]

[0233] Table 4

[0234]

[0235] From the results shown in Tables 1 to 4, it can be seen that the packaging bodies of Examples 1 to 10 can improve the mass ratio of the paper substrate. In addition, the first test samples obtained by sealing calcium chloride in the packaging bodies of Examples 1 to 10 were all "non-deliquescent". In contrast, the first test samples obtained by sealing calcium chloride in the packaging bodies of Comparative Examples 1 to 2 were "deliquescent" or "slightly deliquescent". Therefore, it can be seen that the packaging bodies of Examples 1 to 10 have higher gas barrier properties than Comparative Examples 1 to 2. Furthermore, the second test samples obtained by sealing a permeating liquid in the packaging bodies of Examples 1 to 10 were all "non-permeable". In contrast, the second test samples obtained by sealing calcium chloride in the packaging bodies of Comparative Examples 1 to 2 were "permeable". Therefore, it can be seen that the packaging bodies of Examples 1 to 10 can improve the sealing properties of the second test samples compared with Comparative Examples 1 to 2.

[0236] From the above, it was confirmed that the packaging body according to the present disclosure can improve the gas barrier properties and durability while increasing the mass ratio of the paper base material, and can also improve the sealing properties of the packaged product obtained by sealing the content.

[0237] Explanation of symbols

[0238] 10 main component, 10a main body, 10b bottom, 11, 21 paper substrate, 12, 22 adhesion promoter coating, 13, 23 vapor deposition layer, 14, 24 heat sealing layer, 15, 25 adhesive layer, 16, 26 outer coating, 20 bottom component, 30A first sealing part, 30B second sealing part, 100 packaging body, 200 packaging product, X intersection part, T1 thickness of heat sealing layer of main component, T2 thickness of heat sealing layer of bottom component, C content.

Claims

1. A packaging body in the shape of a self-supporting bag formed by inserting a bottom member in a bent state between a pair of trunk members having a main body and a bottom, heat-sealing the peripheral portions of the main body of the pair of trunk members to each other to form a first sealed portion, and heat-sealing the peripheral portions of the bottom of the pair of trunk members to the peripheral portion of the bottom member to form a second sealed portion, wherein: The main body component and the bottom component are provided with a paper substrate, an adhesion-promoting coating, a vapor-deposited layer containing a metal or a metal oxide, and a heat-sealing layer in sequence. The first sealing portion is formed by heat-sealing the heat-sealing layers of the pair of trunk members to each other. The second sealing portion is formed by heat-sealing the heat-sealing layer of the trunk member and the heat-sealing layer of the bottom member. The thickness of the heat-sealing layer of the trunk component is in the range of 2 to 5 μm. The ratio of the thickness of the heat-sealing layer of the bottom member to the thickness of the heat-sealing layer of the trunk member is 5 or more, The mass ratio of the paper substrate to the total mass of the packaging body is 70 mass % or more.

2. The packaging body according to claim 1, wherein: No gap is formed at an intersection of the first sealing portion and the second sealing portion.

3. The packaging body according to claim 1, wherein: The heat seal layer of the trunk member is formed by a coating film obtained by applying and drying a water dispersion, wherein the water dispersion is formed by dispersing a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group in water as a resin component, The heat-sealing layer of the bottom member is a polyolefin film.

4. The packaging body according to claim 3, wherein: The base member further includes an adhesive layer between the vapor-deposited layer and the heat-sealing layer.

5. The packaging body according to claim 4, wherein: The base member further includes an overcoat layer between the vapor-deposited layer and the adhesive layer.

6. The packaging body according to claim 5, wherein: The outer coating layer includes a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group.

7. The packaging body according to claim 1, wherein: A ratio of a thickness of the paper substrate of the bottom member to a total thickness of the heat-sealing layer of the trunk member and the heat-sealing layer of the bottom member is greater than 0.

5.

8. The packaging body 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 trunk member and the heat seal layer of the bottom member is 5.0 or less.

9. The packaging body according to claim 1, wherein: In the trunk member and the bottom member, the adhesion-promoting coating layer includes a polyolefin having at least one selected from a carboxyl group and a salt of a carboxyl group.

10. The packaging body according to claim 1, wherein: In the trunk member and the bottom member, the adhesion-promoting coating contains polyvinyl alcohol.

11. The package according to claim 1, wherein: In the trunk member and the bottom member, the adhesion-promoting coating layer contains a polyurethane-based resin.

12. The package according to claim 1, wherein: A ratio of a thickness of the heat-sealing layer of the bottom member to a thickness of the heat-sealing layer of the trunk member is 100 or less.

13. The package according to claim 1, wherein: The paper substrate is uncoated paper without coating layer.

14. A packaged product obtained by sealing contents in the package body according to claim 1.

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