Base material, film, and packaging body including them

Abstract

To provide a base material, a film and a package provided therewith that are decomposed in an environment, thereby hardly affecting an ecological system.SOLUTION: A base material 20 constituting a package 10 for skin-packing a content 100, together with a skin-packable film 30, comprises a biodegradable plastic.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a biodegradable base material, a biodegradable film, and a packaging product comprising the same. [Background technology]

[0002] A skin pack package is known in which an article is placed on a mount and the mount and a film are joined with a heat-sensitive adhesive to package and seal the article on the mount. Patent Document 1 discloses an example of the configuration of a conventional skin pack package. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-51944 A Summary of the Invention [Problem to be solved by the invention]

[0004] If the skin pack packaging is not properly disposed of after use, most of the packaging will remain in the environment. Packaging remaining in the environment may have an adverse effect on ecosystems, for example, by being accidentally ingested by wild animals or by soil contamination due to the chemicals contained in the packaging.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a base material, a film, and a packaging body comprising the same that are decomposed in the environment and have little impact on the ecosystem. [Means for solving the problem]

[0006] The base material according to the present invention is a base material that constitutes a packaging body for skin-packing the contents together with a skin-packable film, and the base material comprises a biodegradable plastic. According to this base material, the base material contains a biodegradable plastic, and even if the base material remains in the environment, at least a part of the base material is decomposed by the action of microorganisms in the environment, and therefore the base material is unlikely to have an adverse effect on the ecosystem.

[0007] According to one example of the base material, the base material includes an innermost layer, a gas barrier layer, and an outermost layer, and at least one of the innermost layer, the gas barrier layer, and the outermost layer comprises a biodegradable plastic. According to this base material, at least one of the layers constituting the base material is made of biodegradable plastic. Even if the base material remains in the environment, at least a part of it will be decomposed by the action of microorganisms in the environment, and it will have little impact on the ecosystem.

[0008] According to one example of the base material, the base material further includes a paper layer. According to this base material, the base material includes a paper layer, and the presence of the paper layer promotes the decomposition of the biodegradable plastic that constitutes the base material, so that the base material has less impact on the ecosystem.

[0009] The film according to the present invention is a film that constitutes a packaging body for skin-packing contents together with a base material capable of being skin-packed, and the film comprises a biodegradable plastic. According to this film, the film contains a biodegradable plastic, and even if the base material remains in the environment, at least a part of it is decomposed by the action of microorganisms in the environment, and therefore, it is unlikely to have an adverse effect on the ecosystem.

[0010] According to one example of the film, the film includes an innermost layer, a gas barrier layer, and an outermost layer, at least one of the innermost layer, the gas barrier layer, and the outermost layer comprising a biodegradable plastic. At least one of the layers constituting this film is made of biodegradable plastic, and even if the film remains in the environment, at least a part of it will be decomposed by microorganisms in the environment, so it will have little impact on the ecosystem.

[0011] The packaging body according to the present invention comprises the base material, the film, and the contents. This packaging is at least partially made of biodegradable plastic, so that even if the packaging remains in the environment, at least a part of it will be decomposed by microorganisms in the environment, and it will have little impact on the ecosystem.

[0012] According to one example of the packaging body, the base material and the film are joined together by an easy-peel structure. According to this package, when the user wants to remove the contents from the package, the user can easily remove the contents. Effect of the Invention

[0013] The base material, film, and packaging material comprising them according to the present invention are decomposed in the environment and have little impact on the ecosystem. [Brief description of the drawings]

[0014] [Figure 1] FIG. [Diagram 2] 2 is a cross-sectional view taken along line D2-D2 in FIG. 1; [Diagram 3] FIG. 2 is a cross-sectional view showing the layer structure of the base material of FIG. [Figure 4] FIG. 2 is a cross-sectional view showing the layer structure of the film in FIG. [Diagram 5] 1 is a table showing the results of a comparison test of the packaging bodies of the Examples and Comparative Examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] (Embodiment) A packaging body 10 according to an embodiment will be described with reference to Figs. 1 to 4. The packaging body 10 shown in Fig. 1 is configured to be capable of packaging various contents 100. The contents 100 are arbitrarily selected by a user. In a first example, the contents 100 are food products. The food products are, for example, fresh foods and processed foods. In a second example, the contents 100 are articles. The articles are, for example, stationery and daily necessities. In the example shown in Fig. 1, the contents 100 are food products.

[0016] The main elements constituting the package 10 are the base material 20 and the film 30. The base material 20 has a configuration suitable for placing the contents 100. The film 30 has a configuration suitable for packaging the contents 100 placed on the base material 20. The packaging form of the package 10 can be selected from any packaging form. In the first example, the film 30 is heated to pack the base material 20, the film 30, and the contents 100 in close contact with each other. In the second example, the base material 20 and the film 30 are packed in vacuum packing by removing air from the internal space formed by the base material 20 and the film 30. In skin packing, substantially no space is formed between the part of the film 30 that is not in contact with the contents 100 and the base material 20. In vacuum packing, a small space is formed between the part of the film 30 that is not in contact with the contents 100 and the base material 20. In the example shown in FIG. 1, the packaging form of the package 10 is skin packing. According to the skin pack packaging, since no internal space is formed, when the contents 100 are foodstuffs, liquid generated from the foodstuffs is unlikely to leak out. Therefore, the freshness and appearance of the foodstuffs can be maintained in a good condition for a long period of time. Furthermore, since the contents 100 do not move relative to the base material 20, there are fewer restrictions on the display method of the package 10.

[0017] The shape of the base material 20 is selected arbitrarily depending on the type and size of the contents 100. In the example shown in FIG. 1, the shape of the base material 20 is a rectangle suitable for placing foodstuffs, which are the contents 100. The shape of the base material 20 may be a triangle, a square, a polygonal shape having pentagons or more, a circle, or an ellipse. The size of the base material 20 is set depending on the contents 100. It is preferable that the area of ​​the base material 20 when viewed in a plane is at least twice the area of ​​the contents 100 when viewed in a plane.

[0018] The base material 20 includes a plurality of layers. The base material 20 shown in Fig. 3 includes an innermost layer 21, a barrier layer 22, a bonding layer 23, a paper layer 24, and an outermost layer 25. The layers constituting the base material 20 are laminated by any means. In one example, the layers constituting the base material 20 are laminated by a dry lamination method.

[0019] The innermost layer 21 is laminated on the innermost part of the base material 20, in other words, at the position closest to the contents 100. The contents 100 are placed on the innermost layer 21. The innermost layer 21 is preferably made of a material having a waterproof function. This makes it difficult for moisture flowing out from the contents 100 to leak. The material constituting the innermost layer 21 is, for example, a biodegradable plastic. The thickness of the innermost layer 21 is selected to be sufficient for the waterproof function. The thickness of the innermost layer 21 is, for example, 10 μm or more. The thickness of the innermost layer 21 is, for example, 100 μm or less. The thickness of the innermost layer 21 is, for example, 55 μm.

[0020] Biodegradable plastics are plastics that are eventually decomposed into water and carbon dioxide by the action of microorganisms and the like present in the decomposition environment. The decomposition environment is, for example, a high-temperature and high-humidity environment inside a composter where compost is formed, and a soil environment. It is preferable that biodegradable plastics are decomposed in the environment inside a composter and in the soil environment, and are not decomposed or decompose slowly in the user's living environment. The user's living environment is, for example, a house and a warehouse where the package 10 is stored.

[0021] The biodegradable plastic is configured to include at least one of, for example, polyvinyl alcohol (PVA), polybutylene adipate / terephthalate (PBAT), polylactic acid (PLA), polycaprolactone (PCL), polyhydroxybutyrate (PHB), polyhydroxybutyrate / hexanoate (PHBH), polybutylene succinate (PBS), polyhydroxyalkane (PHA), glucose, and cellulose. The material constituting the biodegradable plastic is, for example, derived from a petroleum material or a biomass material. The biodegradable plastic is selected in consideration of the heat resistance, gas barrier property, moisture barrier property, rigidity, transparency, oil resistance, moisture resistance, toughness, abrasion resistance, and elasticity of each material. An example of the biodegradable plastic constituting the innermost layer 21 is PBS.

[0022] The barrier layer 22 is laminated on the opposite side of the contents 100 to the innermost layer 21. Therefore, when the contents 100 contain moisture, the moisture seeping out from the contents 100 is unlikely to penetrate the paper layer 24. Therefore, the strength of the base material 20 is maintained. Hereinafter, the opposite side of the contents 100 with respect to any layer may be referred to as the outside. The barrier layer 22 is made of a material that is excellent in at least one of gas barrier properties and moisture barrier properties. Therefore, the quality of the contents 100 is well maintained for a long period of time. The barrier layer 22 is made of, for example, a biodegradable plastic. An example of the biodegradable plastic that constitutes the barrier layer 22 is starch formed by polymerizing glucose. The barrier layer 22 has gas barrier properties and moisture barrier properties by vapor deposition of a transparent inorganic thin film. Examples of materials that constitute the inorganic thin film are aluminum oxide and silicon oxide. The gas whose permeation is suppressed by the barrier layer 22 is, for example, oxygen. The thickness of the barrier layer 22 is selected to be sufficient for gas barrier properties and moisture barrier properties. The barrier layer 22 has a thickness of, for example, 10 μm or more. The barrier layer 22 has a thickness of, for example, 30 μm or less. The barrier layer 22 has a thickness of, for example, 12 μm.

[0023] The bonding layer 23 is, for example, laminated on the outer side of the barrier layer 22. The bonding layer 23 is made of a material capable of bonding the barrier layer 22 and the paper layer 24. The thickness of the bonding layer 23 is selected to be sufficient for bonding the barrier layer 22 and the paper layer 24. The material constituting the bonding layer 23 is, for example, a biodegradable plastic. An example of the biodegradable plastic constituting the bonding layer 23 is PBS. The thickness of the bonding layer 23 is, for example, 10 μm or more. The thickness of the bonding layer 23 is, for example, 30 μm or less. The thickness of the bonding layer 23 is, for example, 20 μm.

[0024] The paper layer 24 is, for example, laminated on the outside of the bonding layer 23. The material constituting the paper layer 24 is, for example, non-recycled paper. The basis weight contributing to the thickness of the paper layer 24 can be selected arbitrarily. The basis weight of the paper layer 24 is preferably determined based on the relationship between the resistance of the base material 20 to warping when the base material 20 and the film 30 are bonded, and the thickness of the package 10. One preferred example of the maximum basis weight of the paper layer 24 is 1000 g / m 2 The basis weight of the paper layer 24 is 1000 g / m 2 When the basis weight of the paper layer 24 is 1000 g / m or less, the thickness of the package 10 is not too thick. This makes it possible to reduce the display space required for the package 10. In addition, the cost of the package 10 can be reduced. 2 If the weight is less than 100 g / m, minute gaps are formed that allow water vapor to pass through. 2 The basis weight of the paper layer 24 is 100 g / m 2 When the basis weight is equal to or greater than 100 g / m, the base material 20 is less likely to warp when the base material 20 and the film 30 are joined together. 2 More than ~1000g / m 2 In one example, the basis weight of the paper layer 24 is 450 g / m 2 It is.

[0025] The outermost layer 25 is laminated on the outside of the paper layer 24. The outermost layer 25 is made of a material having a waterproof function. Therefore, even if condensation occurs, water is unlikely to penetrate the paper layer 24. Therefore, the strength of the base material 20 is maintained. The material constituting the outermost layer 25 is, for example, a biodegradable plastic. An example of a biodegradable plastic constituting the outermost layer 25 is PBS. The thickness of the outermost layer 25 is selected to be sufficient to prevent water from penetrating the paper layer 24. The thickness of the outermost layer 25 is, for example, 10 μm or more. The thickness of the outermost layer 25 is, for example, 100 μm or less. The thickness of the outermost layer 25 is, for example, 20 μm.

[0026] The film 30 includes a plurality of layers. Preferably, the plurality of layers are made of transparent materials so that the contents 100 can be seen. The film 30 shown in Fig. 4 includes an innermost layer 31, a first adhesive layer 32, a barrier layer 33, a second adhesive layer 34, an intermediate layer 35, and an outermost layer 36. The layers of the film 30 are laminated by any means. In one example, the layers constituting the film 30 are laminated by a coextrusion method.

[0027] The innermost layer 31 is laminated on the innermost side of the film 30, in other words, at the position closest to the contents 100. When the packaging form of the packaging body 10 is a skin pack, the portion of the innermost layer 31 that faces the contents 100 is in close contact with the contents 100 as shown in FIG. 2. The innermost layer 31 is made of, for example, a biodegradable plastic. An example of the biodegradable plastic that makes up the innermost layer 31 is PBS. The thickness of the innermost layer 31 is, for example, 10 μm or more. The thickness of the innermost layer 31 is, for example, 100 μm or less. The thickness of the innermost layer 31 is, for example, 30 μm.

[0028] The first adhesive layer 32 is laminated, for example, on the outer side of the innermost layer 31. The first adhesive layer 32 bonds the innermost layer 31 and the barrier layer 33. The material constituting the first adhesive layer 32 is, for example, an adhesive resin formed by polymerizing an adhesive functional group. The thickness of the first adhesive layer 32 is selected to be suitable for bonding the innermost layer 31 and the barrier layer 33. The thickness of the first adhesive layer 32 is, for example, 5 μm.

[0029] The barrier layer 33 is laminated, for example, on the side opposite to the contents 100 with respect to the first adhesive layer 32. The barrier layer 33 is preferably made of a material having excellent at least one of gas barrier properties, oil resistance, and moisture resistance. The gas whose permeation is suppressed by the barrier layer 33 is, for example, oxygen. The thickness of the barrier layer 33 is selected to be suitable for achieving at least one of gas barrier properties, oil resistance, and moisture resistance. The material constituting the barrier layer 33 is, for example, a biodegradable plastic. An example of the biodegradable plastic constituting the barrier layer 33 is starch formed by polymerizing glucose. The thickness of the barrier layer 33 is, for example, 10 μm or more. The thickness of the barrier layer 33 is, for example, 50 μm or less. The thickness of the barrier layer 33 is, for example, 30 μm.

[0030] The second adhesive layer 34 is laminated on the outer side of the barrier layer 33. The second adhesive layer 34 bonds the barrier layer 33 and the intermediate layer 35. The material constituting the second adhesive layer 34 is, for example, an adhesive resin formed by polymerizing an adhesive functional group. The thickness of the second adhesive layer 34 is selected to be suitable for bonding the barrier layer 33 and the intermediate layer 35. The thickness of the second adhesive layer 34 is, for example, 5 μm.

[0031] The intermediate layer 35 is laminated on the outer side of the second adhesive layer 34. The intermediate layer 35 is preferably made of a material having excellent at least one of toughness and abrasion resistance. The material constituting the intermediate layer 35 is, for example, a biodegradable plastic. An example of the biodegradable plastic constituting the intermediate layer 35 is PBS. The thickness of the intermediate layer 35 is selected to be suitable for realizing at least one of toughness and abrasion resistance. The thickness of the intermediate layer 35 is, for example, 10 μm or more. The thickness of the intermediate layer 35 is, for example, 50 μm or less. The thickness of the intermediate layer 35 is, for example, 30 μm.

[0032] The outermost layer 36 is laminated on the outer side of the intermediate layer 35. The outermost layer 36 is preferably made of a material having excellent at least one of heat resistance, gas barrier properties, moisture resistance, strength, and transparency. The material constituting the outermost layer 36 is, for example, a biodegradable plastic. An example of the biodegradable plastic constituting the outermost layer 36 is PBS. The thickness of the outermost layer 36 is selected to be suitable for at least one of heat resistance, gas barrier properties, moisture resistance, strength, and transparency. The thickness of the outermost layer 36 is, for example, 10 μm or more. The thickness of the outermost layer 36 is, for example, 100 μm or less. The thickness of the outermost layer 36 is, for example, 50 μm.

[0033] The base material 20 and the film 30 are joined by any means. In one example, the base material 20 and the film 30 are bonded by heat sealing. A hot melt adhesive is applied to at least one of the innermost layer 21 of the base material 20 and the innermost layer 31 of the film 30. An example of a hot melt adhesive is an ethylene vinyl acetate (EVA)-based or ethylene methyl methacrylate (EMMA)-based hot melt adhesive.

[0034] According to the packaging body 10 of the embodiment, the following actions and effects can be obtained. When the packaging body 10 is placed in, for example, a composter environment or a soil environment after use, the elements that make up the packaging body 10 are decomposed by the biodegradable plastic. Therefore, the packaging body 10 decomposes in the environment and has little impact on the ecosystem.

[0035] (Example) The inventor of the present application conducted a comparative test to evaluate the biodegradability of the package 10 of the present application. The contents of the comparative test will be described. The package 10 of each Example and the package 10 of the Comparative Example were placed in a composter containing compost containing microorganisms with biodegradability, and the decomposition rate was evaluated at predetermined time intervals. The predetermined time was every week or every two weeks. The temperature inside the composter during the test was controlled to be 60 degrees and the pH between 7 and 9. The composter during the test was placed in a dark place not exposed to direct sunlight. The package 10 of each Example and the Comparative Example was placed in the composter as a test sample of 10 g. The test sample was ultrasonically cleaned to remove any attached matter in the composter, and the weight was measured. The weight of the test sample at each predetermined time interval was divided by the weight of the test sample at the start to calculate the decomposition rate. The inventor of the present application judged the package 10 whose decomposition rate reached 100% by the 10th week as "good". The packages 10 in which the decomposition rate reached 100% after the 11th week were rated as "△." The packages 10 in which the decomposition rate did not reach 100% by the end of the test were rated as "X."

[0036] The configurations of the packages 10 of the examples and comparative examples used in the comparative test will be described. In the package 10 of Example 1, the innermost layer 21, bonding layer 23, and outermost layer 25 constituting the base material 20 are made of PBS. The barrier layer 22 constituting the base material 20 is made of PLA. The paper layer 24 constituting the base material 20 is made of non-recycled paper. The innermost layer 31, intermediate layer 35, and outermost layer 36 constituting the film 30 are made of PBS. The first adhesive layer 32 and the second adhesive layer 34 are made of an adhesive resin in which an adhesive functional group is polymerized. The adhesive resin is a polyolefin in which a polar group has been introduced. The barrier layer 33 constituting the film 30 is made of starch in which glucose has been polymerized.

[0037] In the packaging body 10 of Example 2, the innermost layer 21 constituting the base material 20 and the innermost layer 31 constituting the film 30 contain PBS and PLA. The other configurations are the same as those of the packaging body 10 of Example 1.

[0038] In the package 10 of Example 3, the innermost layer 21 constituting the base material 20 and the innermost layer 31 constituting the film 30 contain PBS and starch. The other configurations are the same as those of the package 10 of Example 1.

[0039] In the packaging body 10 of Example 4, the innermost layer 31 constituting the film 30 contains PLA and starch. The other configurations are the same as those of the packaging body 10 of Example 1.

[0040] In the packaging body 10 of Example 5, the barrier layer 22 constituting the base material 20 contains starch. The innermost layer 31 constituting the film 30 contains PLA and starch. The other configurations are similar to those of the packaging body 10 of Example 1.

[0041] In the package 10 of Example 6, the innermost layer 21, the bonding layer 23, and the outermost layer 25 constituting the base material 20 are made of PHBH. The innermost layer 31, the intermediate layer 35, and the outermost layer 36 constituting the film 30 are made of PHBH. The other configurations are the same as those of the package 10 of Example 1.

[0042] In the package 10 of Example 7, the innermost layer 21 constituting the base material 20 is made of PLA. The barrier layer 22 constituting the base material 20 is made of cellophane containing cellulose. The innermost layer 31, the intermediate layer 35, and the outermost layer 36 constituting the film 30 are all made of PLA. The other configurations are the same as those of the package 10 of Example 1.

[0043] In the packaging body 10 of Example 8, the innermost layer 21 constituting the base material 20 contains PLA and PBS. The other configurations are the same as those of the packaging body 10 of Example 1.

[0044] In the package 10 of Example 9, the paper layer 24 constituting the base material 20 has gas barrier properties and moisture barrier properties. In one example, the paper constituting the paper layer 24 is subjected to a water repellent treatment. The barrier layer 22 constituting the base material 20 is omitted. The innermost layer 31, the middle layer 35, and the outermost layer 36 constituting the film 30 each include a layer of PBS and a layer of PLA. The other configurations are the same as those of the package 10 of Example 1.

[0045] In the package 10 of Example 10, the innermost layer 21 constituting the base material 20 is made of PLA. The barrier layer 22 constituting the base material 20 is made of cellophane containing cellulose. The intermediate layer 35 and the outermost layer 36 constituting the film 30 each include a layer of PBS and a layer of PLA. The other configurations are the same as those of the package 10 of Example 1.

[0046] In the package 10 of Example 11, the paper layer 24 constituting the base material 20 has gas barrier properties and moisture barrier properties. The outside of the paper layer 24 is coated with PBS on which an inorganic thin film is transparently deposited. The barrier layer 22 and the outermost layer 25 are omitted. The intermediate layer 35 and the outermost layer 36 constituting the film 30 are made of PLA. The other configurations are the same as those of the package 10 of Example 1.

[0047] In the package 10 of Example 12, the innermost layer 31 constituting the film 30 contains PBS and PLA. The intermediate layer 35 and the outermost layer 36 constituting the film 30 are made of PLA. The other configurations are the same as those of the package 10 of Example 1.

[0048] In the package 10 of Example 13, the innermost layer 31 constituting the film 30 is made of PLA. The intermediate layer 35 and the outermost layer 36 constituting the film 30 contain PBS and starch. The other configurations are the same as those of the package 10 of Example 1.

[0049] In the package 10 of Example 14, the innermost layer 21 constituting the base material 20 contains PBS and PLA. The innermost layer 31 constituting the film 30 is made of PLA. The intermediate layer 35 and the outermost layer 36 constituting the film 30 contain PLA and starch. The other configurations are the same as those of the package 10 of Example 1.

[0050] In the packaging body 10 of Comparative Example 1, the innermost layer 21 constituting the base material 20 is made of polyethylene. The barrier layer 22 is made of polyethylene terephthalate on which an inorganic thin film such as aluminum oxide or silicon oxide is vapor-deposited. The bonding layer 23 is made of ethylene-methacrylic acid copolymer resin (EMAA resin). The paper layer 24 is made of corded cardboard, and the outside of the paper layer 24 is treated to be water-repellent. The basis weight of the corded cardboard is 310 g / m 2 The innermost layer 31 constituting the film 30 is made of an ionomer resin. The first adhesive layer 32 and the second adhesive layer 34 are adhesive resins obtained by polymerizing adhesive functional groups. The barrier layer 33 is made of an ethylene-vinyl alcohol copolymer (EVOH). The intermediate layer 35 is made of polyamide. The outermost layer 36 is made of polyester. The packaging body 10 of Comparative Example 1 does not contain biodegradable plastic.

[0051] In the packaging body 10 of Comparative Example 2, the paper layer 24 constituting the base material 20 is made of bleached kraft paper. The basis weight of the bleached kraft paper is 90 g / m 2 The barrier layer 33 constituting the film 30 is made of nylon polymerized with polyamide. The other configurations are the same as those of the package 10 of Comparative Example 1.

[0052] The packaging body 10 of Comparative Example 3 is the same as the packaging body 10 of Example 1 in that the paper layer 24 is omitted.

[0053] The packaging body 10 of Comparative Example 4 is the same as the packaging body 10 of Example 2 in that the paper layer 24 is omitted.

[0054] The packaging body 10 of Comparative Example 5 is the same as the packaging body 10 of Example 6 in that the paper layer 24 is omitted.

[0055] The packaging body 10 of Comparative Example 6 is the same as the packaging body 10 of Example 7 in that the paper layer 24 is omitted.

[0056] The test results of the packages 10 of Examples 1 to 14 and Comparative Examples 1 to 6 will be described with reference to FIG. 5. The packages 10 of the Examples except for Example 6 reached a decomposition rate of 100% in 9 weeks from the start of the test. The package 10 of Example 6 reached a decomposition rate of 100% in 10 weeks from the start of the test. The packages 10 of Examples 1 to 14 were evaluated as "good". The packages 10 of Comparative Examples 1 and 2 had a decomposition rate of about 10% even after 13 weeks had passed. The packages 10 of Comparative Examples 1 and 2 were evaluated as "poor". The packages 10 of Comparative Examples 3 to 6 reached a decomposition rate of 100% in 11 to 12 weeks from the start of the test. The packages 10 of Comparative Examples 3 to 6 were evaluated as "good".

[0057] In the packages 10 of Comparative Examples 3 to 6, it took 11 to 12 weeks from the start of the test until the decomposition rate reached 100%. This indicates that the decomposition rate was reduced in the packages 10 of Comparative Examples 3 to 6 because the paper layer 24 was not included. The paper layer 24 contains moisture in the environment inside the composter. The paper layer 24 supplies moisture to microorganisms, increasing at least one of the activity of the microorganisms and the number of the microorganisms. The packages 10 of Examples 1 to 14 are decomposed in the environment inside the composter faster than the packages 10 of Comparative Examples 3 to 6 that do not have the paper layer 24. In the test results in a soil environment not shown, the packages 10 of Examples 1 to 14 reached a decomposition rate of 100% faster than the packages 10 of Comparative Examples that do not have the paper layer 24. The decomposition rates in Comparative Examples 1 and 2 are the decomposition amounts of the paper that constitutes the paper layer 24.

[0058] (Modification) The description of the embodiments is merely an example of the form that the base material, film, and package including them according to the present invention may take, and is not intended to limit the form. The base material, film, and package including them according to the present invention may take a form other than the embodiment, for example, a modified version of the embodiment shown below, or a combination of at least two mutually non-inconsistent modified versions.

[0059] At least one of the materials constituting the base material 20 may be composed of a material other than biodegradable plastic. The material constituting the innermost layer 21 is, for example, polyethylene. The material constituting the barrier layer 22 is, for example, polyethylene terephthalate on which an inorganic thin film such as aluminum oxide or silicon oxide is vapor-deposited. The material constituting the bonding layer 23 is, for example, EMAA resin. The material constituting the outermost layer 25 is, for example, polyethylene. The base material 20 can be composed more cheaply and according to the application than if it were composed of biodegradable plastic.

[0060] At least one of the layers constituting the film 30 may be made of a material other than biodegradable plastic. The material constituting the innermost layer 31 is, for example, polyethylene. The material constituting the barrier layer 33 is, for example, EVOH. The material constituting the intermediate layer 35 is, for example, polyamide. The material constituting the outermost layer 36 is, for example, polyester. It is possible to construct a film 30 more cheaply and according to the application than if it were made of biodegradable plastic.

[0061] The base material 20 may further include a layer containing a biodegradable plastic. In one example, at least one of the inner and outer surfaces of the paper layer 24 that is in contact with the paper layer 24 further includes a starch layer composed of starch polymerized with glucose. The glucose that constitutes the starch layer is used as an energy source for microorganisms during biodegradation. The moisture retained in the paper layer 24 and the glucose in the starch layer increase at least one of the activity and number of microorganisms. This further accelerates the decomposition of the packaging body 10 that includes a biodegradable plastic.

[0062] The base material 20 and the film 30 may be bonded by an easy peel structure 40. The easy peel structure 40 is a structure in which the innermost layer 21 of the base material 20 and the innermost layer 31 of the film 30 are sealed so as to be easily peeled off. The easy peel structure 40 is formed by heating the base material 20 and the film 30 that can form the easy peel structure 40 based on heating conditions. In one example, one of the innermost layer 21 and the innermost layer 31 contains PLA, which is an ionomer resin, and the other is made of PBS, which is an easy peel film. The heating conditions include heating time and heating temperature. An example of the heating time is 20 seconds. An example of the heating temperature is 150 degrees. The seal strength of the easy peel structure 40 portion is set to a degree that the user can easily peel it off and that does not peel off naturally during transportation and display. In one example, the seal strength of the easy peel structure 40 is 1.0 N / 15 mm or more. When the seal strength of the easy-peel structure 40 is 1.0 N / 15 mm or more, the film 30 is unlikely to peel off from the base material 20 even when a standard stress is applied to the package 10 during transportation and display. In one example, the seal strength of the easy-peel structure 40 is 5.0 N / 15 mm or less. When the seal strength of the easy-peel structure 40 is 5.0 N / 15 mm or less, the user can easily peel the film 30 off from the base material 20 by applying a standard force to peel off the package 10. An example of the seal strength of the easy-peel structure 40 is 2.0 N / 15 mm. [Explanation of symbols]

[0063] 10...packaging 20...Base material 21 ... innermost layer 22...Gas barrier layer 24…Paper layer 25…outermost layer 30...Film 31 ... innermost layer 33...Gas barrier layer 36...outermost layer 40...Easy peel structure 100…Contents

Claims

1. A base material constituting a packaging body for skin-packing contents, an innermost layer to which a film for skin-packing the contents is bonded; A barrier layer provided on the outer side of the innermost layer; a paper layer provided on the outer side of the barrier layer; a bonding layer that bonds the barrier layer and the paper layer; an outermost layer provided on the outer side of the paper layer; the innermost layer, the barrier layer, the bonding layer, and the outermost layer each contain a biodegradable plastic; the innermost layer contains a different type of biodegradable plastic from the biodegradable plastic contained in the barrier layer, i.e., the base material does not include a configuration in which the type of biodegradable plastic material constituting the innermost layer and the type of biodegradable plastic material constituting the barrier layer are generally the same, but includes a configuration in which the type of biodegradable plastic material constituting the innermost layer and the type of biodegradable plastic material constituting the barrier layer are partially the same or are generally different, The innermost layer contains at least one of the same type of biodegradable plastic as the biodegradable plastic contained in the bonding layer and a different type of biodegradable plastic from the biodegradable plastic contained in the bonding layer. In other words, the base material includes a configuration in which the type of material of the biodegradable plastic constituting the innermost layer and the type of material of the biodegradable plastic constituting the bonding layer are entirely the same, partially the same, or entirely different; The innermost layer contains at least one of the same type of biodegradable plastic as the biodegradable plastic contained in the outermost layer and a different type of biodegradable plastic from the biodegradable plastic contained in the outermost layer, i.e., the base material includes a configuration in which the type of material of the biodegradable plastic constituting the innermost layer and the type of material of the biodegradable plastic constituting the outermost layer are entirely the same, partially the same, or entirely different, The base material is a first base material layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally the same as the type of biodegradable plastic material constituting the bonding layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally the same as the type of biodegradable plastic material constituting the outermost layer; a second base material layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is entirely different from the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is partially the same as the type of biodegradable plastic material constituting the bonding layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is partially the same as the type of biodegradable plastic material constituting the outermost layer; a third base material layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the bonding layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the outermost layer; a configuration in which the type of biodegradable plastic material constituting the innermost layer partially matches the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer partially matches the type of biodegradable plastic material constituting the bonding layer, and a fourth base material layer configuration in which the type of biodegradable plastic material constituting the innermost layer partially matches the type of biodegradable plastic material constituting the outermost layer; Contains one of the following: Base material.

2. A film constituting a packaging body for skin-packing contents, an innermost layer bonded to a base material on which the contents are placed; A barrier layer provided on the outer side of the innermost layer; an intermediate layer provided on the outer side of the barrier layer; an outermost layer provided on the outer side of the intermediate layer, the innermost layer, the barrier layer, the intermediate layer, and the outermost layer each contain a biodegradable plastic; the innermost layer contains a different type of biodegradable plastic from the biodegradable plastic contained in the barrier layer, i.e., the film does not include a configuration in which the type of biodegradable plastic material constituting the innermost layer and the type of biodegradable plastic material constituting the barrier layer are generally the same, but includes a configuration in which the type of biodegradable plastic material constituting the innermost layer and the type of biodegradable plastic material constituting the barrier layer are partially the same or generally different, the innermost layer contains at least one of the same type of biodegradable plastic as the biodegradable plastic contained in the intermediate layer and a different type of biodegradable plastic from the biodegradable plastic contained in the intermediate layer, i.e., the film includes a configuration in which the type of biodegradable plastic material constituting the innermost layer and the type of biodegradable plastic material constituting the intermediate layer are entirely the same, partially the same, or entirely different; the innermost layer contains at least one of the same type of biodegradable plastic as the biodegradable plastic contained in the outermost layer and a different type of biodegradable plastic from the biodegradable plastic contained in the outermost layer, i.e., the film includes a configuration in which the type of biodegradable plastic material constituting the innermost layer and the type of biodegradable plastic material constituting the outermost layer are entirely the same, partially the same, or entirely different, The base material is a first film layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally the same as the type of biodegradable plastic material constituting the intermediate layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally the same as the type of biodegradable plastic material constituting the outermost layer; a second film layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is entirely different from the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is partially the same as the type of biodegradable plastic material constituting the intermediate layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is partially the same as the type of biodegradable plastic material constituting the outermost layer; a third film layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the intermediate layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the outermost layer; a fourth film layer configuration in which the type of biodegradable plastic material constituting the innermost layer partially matches the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer partially matches the type of biodegradable plastic material constituting the intermediate layer, and a fourth film layer configuration in which the type of biodegradable plastic material constituting the innermost layer partially matches the type of biodegradable plastic material constituting the outermost layer; a fifth film layer configuration including a configuration in which the type of biodegradable plastic material constituting the innermost layer is partially the same as the type of biodegradable plastic material constituting the barrier layer, a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the intermediate layer, and a configuration in which the type of biodegradable plastic material constituting the innermost layer is generally different from the type of biodegradable plastic material constituting the outermost layer; Contains one of the following: film.

3. The base material according to claim 1 ; The film of claim 2 ; The contents and packaging.

4. The base material and the film are bonded together by an easy-peel structure. The package according to claim 3.

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