JP6448159B1 - Bag in box - Google Patents

Abstract

The present invention provides a new bag-in-box with low environmental impact.
A box body made of corrugated cardboard, a flexible inner bag housed inside the box body, and a spout joined to the inner bag, the inner bag having a biomass degree It is a single-layer resin molded product formed of a material containing polyolefin resin of 40% or more and 100% or less, and the inner bag includes a pair of container parts, and the edge part of the opening part of one container part faces the other The container portion is sealed at the edge of the opening of the container portion, and the one container portion is pushed inward from the contact portion between the edge portion of the opening portion of one container portion and the edge portion of the opening portion of the other container portion. Can be folded inside the inner bag, the outer surface of the inner bag has irregularities with a height of 0.01 mm or more and 2.0 mm or less, and the spout is connected to at least one container part. box.
[Selection] Figure 5

Description

  The present invention relates to a bag-in-box.

  Bag-in-boxes are widely used for storing and transporting liquid products (beverages, car oils, detergents, drugs, etc.) in various fields such as the food industry, the car industry, the pharmaceutical industry, and the toiletry industry. Such a bag-in-box is composed of an outer box such as a cardboard box that is selected in consideration of the rigidity required for transportation and storage, and a synthetic resin bag that contains a liquid product inside (for example, Patent Document 1).

Japanese Patent No. 4125493

  Meanwhile, aliphatic polyesters such as polylactic acid, polyhydroxybutyric acid, polycaprolactone, and polypropylene succinate have been developed for the purpose of reducing the amount of petroleum resources used. In addition, biomass polyethylene (plant-derived polyethylene) is notable because it has a lower environmental impact and has a quality close to that of petroleum-derived polyethylene because the raw material monomer ethylene is obtained from biomass compared to petroleum-derived polyethylene. Has been.

  However, few attempts have been made to use biomass polyethylene as a material for bag-in-box bags.

  The present invention has been made in view of such circumstances, and provides a novel bag-in-box with a low environmental load.

  In order to solve the above problems, an embodiment of the present invention includes a box body made of corrugated cardboard and a flexible inner bag housed inside the box body, and the inner bag is derived from biomass. A bag-in-box is provided that is formed from a material that includes a polyolefin resin.

  In one embodiment of the present invention, the inner bag is formed of a laminate having at least a sealant layer, and is formed into a bag shape by bonding the sealant layers together. The inner bag is a pair constituting a front surface portion and a rear surface portion. And the pair of side surfaces sandwiched between the pair of plane portions, the pair of side surface portions have a folded portion protruding inside the inner bag, and the plane portion and the side surface portion are It consists of a laminate, and is sealed by the contact portions of a pair of opposed flat portions and a pair of side portions on the four sides of the flat portion, and in the contact portions, the sealant layer that the flat portion has and the sealant layer that the side portion has It is sealed, and the sealant layer may include a biomass-derived polyolefin resin.

  In one aspect of the present invention, the laminate has an outer laminate and an inner laminate located inside the outer laminate, and the outer laminate has an outer sealant layer that is a sealant layer, The inner laminate may have an inner sealant layer that is a sealant layer, and one or both of the outer sealant layer and the inner sealant layer may include a polyolefin-based resin derived from biomass.

  In one aspect of the present invention, the inner sealant layer is formed by laminating the first inner sealant layer, the second inner sealant layer, and the third inner sealant layer in this order from the inner side of the inner bag. In addition, the material for forming the second inner sealant layer including the petroleum-derived polyolefin resin may have a biomass degree of 50% or more and 100% or less.

  In one aspect of the present invention, the third inner sealant layer may include a petroleum-derived polyolefin resin.

  In one aspect of the present invention, the outer laminate has a base material layer on the outer surface of the outer sealant layer, and an adhesive layer between the outer sealant layer and the base material layer, and the outer sealant layer is From the base material layer side, a first outer sealant layer, a second outer sealant layer, and a third outer sealant layer are laminated in this order, and the first outer sealant layer includes a petroleum-derived polyolefin resin, and the second outer sealant layer The material for forming the sealant layer may have a biomass degree of 50% or more and 100% or less.

  In one aspect of the present invention, the third outer sealant layer may include a petroleum-derived polyolefin resin.

  In one aspect of the present invention, the inner bag includes a pair of container parts, and the edge part of the opening part of one container part is sealed to the edge part of the opening part of the other container part facing each other. It is good also as a structure which can be folded inside the inner bag by pushing one container part inside rather than the contact part of the edge part of the opening part of this, and the edge part of the opening part of the other container part.

  In one mode of the present invention, it has a spout joined to an inner bag, and the spout may be made of a polyolefin resin having a biomass degree of 40% or more and 100% or less as a forming material.

  According to one embodiment of the present invention, a novel bag-in-box with a low environmental load is provided.

FIG. 1 is a perspective view showing a bag-in-box 200 according to the first embodiment. FIG. 2 is a plan view showing a state before contents are stored in the inner bag 1 of the first embodiment. 3 is a cross-sectional view taken along line III-III in FIG. FIG. 4 is an enlarged view of α shown in FIG. FIG. 5 is a perspective view showing the inner bag 2 of the second embodiment.

<First Embodiment>
Hereinafter, a bag-in-box according to a first embodiment of the present invention will be described with reference to the drawings. In all the drawings below, the dimensions and ratios of the constituent elements are appropriately changed in order to make the drawings easy to see.

≪Bag in box≫
FIG. 1 is a perspective view showing a bag-in-box 200 of the present embodiment. As shown in FIG. 1, the bag-in-box 200 of this embodiment includes a box body 201, an inner bag 1, and a spout 4.

<Box body>
A box body 201 shown in FIG. 1 has a rectangular parallelepiped shape. The box body 201 of the present embodiment has a space in which the inner bag 1 can be accommodated. An insertion hole 202 is provided in the upper part of the box body 201 shown in FIG. The box body 201 of this embodiment uses corrugated cardboard as a forming material.

<Inner bag>
The inner bag 1 of this embodiment is accommodated in the box body 201. The inner bag 1 of the present embodiment has a space in which contents can be accommodated.

  The contents contained in the inner bag 1 of the present embodiment are not particularly limited, and are pharmaceuticals, cells, tissues, organs, biomaterials, blood, body fluids, enzymes, antibodies, beauty products, nutrients, health agents, cosmetics. And food.

  Moreover, the specific state of the contents accommodated in the inner bag 1 of this embodiment, a shape, etc. are not specifically limited. The content may be, for example, a solid, liquid, gas, powder, granule, mixture, composition, or dispersion. Further, when the content is a liquid, the liquid may be an aqueous solution containing a medicine. When the content is stored in the inner bag 1, an inert gas such as nitrogen may be stored.

  When the content accommodated in the inner bag 1 of this embodiment is a liquid, the inner bag 1 in which the content is accommodated is supported by the inner surface of the box body 201 and has a rectangular parallelepiped shape similar to the box body 201. Inflated.

<Outlet>
The spout 4 of this embodiment is joined to the inner bag 1. The spout 4 is exposed to the outside of the box body 201 from the insertion hole 202 of the box body 201.

  The spout 4 of this embodiment can be molded by an injection molding method using a polyolefin resin. The polyolefin resin used as a raw material for the spout 4 is preferably polyethylene. From the viewpoint of reducing the burden on the environment, the biomass degree of the polyolefin resin is preferably 40% or more. The biomass degree of the polyolefin resin can be 100% or less, and preferably 90% or less. Moreover, it is preferable that the biomass degree of polyolefin resin used as a raw material of the spout 4 is 80% or less from a viewpoint of the moldability in injection molding.

In this specification, the biomass degree employs a value measured in accordance with ASTM D6866. In the above measurement, carbon derived from biomass is distinguished from carbon derived from fossil fuels. Carbon derived from biomass includes radioactive carbon (C ¹⁴ ). On the other hand, as for carbon derived from fossil fuel, radioactive carbon (C ¹⁴ ) has decreased to below the detection limit. Therefore, it is possible to distinguish between carbon derived from biomass and carbon derived from fossil fuels depending on the presence or absence of radioactive carbon (C ¹⁴ ). If the radioactive carbon (C ¹⁴ ) concentration of the biomass-derived carbon is known, the biomass-derived carbon content can be calculated by measuring the radioactive carbon (C ¹⁴ ) concentration contained in the measurement target.

  FIG. 2 is a plan view showing a state before contents are stored in the inner bag 1 of the present embodiment. 3 is a cross-sectional view taken along line III-III in FIG. The inner bag 1 of this embodiment is formed from a material containing a biomass-derived polyolefin resin. The inner bag 1 of this embodiment has flexibility and can be stored in a folded state before use.

  The inner bag 1 of the present embodiment includes a pair of flat surface portions 7 and a pair of side surface portions 10. The pair of flat surface portions 7 constitutes a front surface portion 8 and a rear surface portion 9. The pair of side surface portions 10 are sandwiched between the pair of flat surface portions 7. In the pair of side portions 10, a folded portion 13 that is a gusset protrudes inside the inner bag 1. The flat surface portion 7 and the side surface portion 10 shown in FIG. 2 are rectangular. Generally, the inner bag 1 having the folded portion 13 that is a gusset may be referred to as a “gusset bag”.

  In the four sides of the flat surface portion 7, the contact portions of the pair of facing flat surface portions 7 and the pair of side surface portions 10 are sealed. The four contact portions of the flat surface portion 7 are sealed to form a top seal portion 14, a bottom seal portion 15, and a side seal portion 16. Each seal portion is formed by a heat seal method.

  In this specification, “sealed” means bonded by heat fusion.

  At each corner of the top side 19 and the bottom side 20 of the inner bag 1, a linear skew seal portion 17 that obliquely crosses the corner is formed. Each of the corners is surrounded by one of the top seal portion 14 and the bottom seal portion 15, the side seal portion 16, and the skew seal portion 17. A triangular fin portion 18 is formed integrally with 17. Since the internal space of the fin portion 18 is completely blocked from the internal space of the inner bag 1 by the skew seal portion 17, the stored contents do not enter the internal space of the fin portion 18.

  The skew seal portion 17 is formed by linearly sealing the inner surfaces of the inner bags 1 facing each other from an arbitrary position of the top seal portion 14 or the bottom seal portion 15 to an arbitrary position of the side seal portion 16. The Such a skew seal portion 17 has a function of guiding the contents to the mounting portion of the spout 4. Furthermore, the skew seal portion 17 has a function of bringing the shape of the inner bag 1 after containing the contents close to a rectangular parallelepiped into the box body 201, a function of imparting self-supporting properties to the inner bag 1, and an inner bag 1 It also has the function of improving the impact resistance of the inner bag 1 by dispersing the stress of the impact applied to the inner bag 1.

<Laminate>
The planar portion 7 of the present embodiment is formed from the stacked body 100. FIG. 4 is an enlarged view of α shown in FIG. FIG. 4 shows the layer configuration of the laminate 100 in the plane portion 7.

  As illustrated in FIG. 4, the stacked body 100 includes an outer stacked body 110 and an inner stacked body 120. In the side seal portion 16 that is the four contact portions of the flat portion 7, the outer laminated body 110 and the inner laminated body 120 are sealed. Moreover, the center part of the plane part 7 is overlapped in a state where the outer laminated body 110 and the inner laminated body 120 are not bonded. Such an inner bag 1 in which two films (the outer laminated body 110 and the inner laminated body 120) are overlapped with each other may be referred to as a “double bag”. Similarly, in the top seal part 14, the bottom seal part 15, and the skew seal part 17, the outer laminated body 110 and the inner laminated body 120 are sealed.

[Outer laminate]
The outer laminate 110 of this embodiment includes an outer sealant layer 114, a base material layer 115 on the outer surface 114 a of the outer sealant layer 114, and an adhesive layer 116 between the outer sealant layer 114 and the base material layer 115. ,have. In addition, the outer side laminated body which concerns on this invention is not limited to this, A base material layer and an adhesive bond layer can also be abbreviate | omitted.

  In the present specification, the “outer sealant layer 114” corresponds to the “sealant layer” in the claims.

(Base material layer)
The base material layer 115 of the present embodiment improves the strength of the inner bag 1 of the present embodiment. The base material layer 115 of the present embodiment preferably includes a polyester resin such as polyethylene terephthalate (PET), a polyamide resin such as nylon (Ny), and a resin such as polypropylene (PP).

  The base material layer 115 may have a single-layer configuration consisting of one layer, or a stacked configuration of two or more layers. The layers that may constitute the base material layer 115 (hereinafter referred to as “other layers”) can be appropriately selected. Examples of other layers include a reinforcing layer, a gas barrier layer, and a light shielding layer. The other layers can be configured not to contain a fluorine-based resin.

  Examples of the reinforcing layer include reinforcing resin layers such as biaxially stretched polyethylene terephthalate (O-PET), biaxially stretched nylon (O—Ny), and biaxially stretched polypropylene (OPP).

  The gas barrier layer can be composed of, for example, an inorganic material or a gas barrier resin. As an inorganic substance, metal oxide layers, such as a metal vapor deposition layer and an alumina, are mentioned. Examples of the gas barrier resin include ethylene-vinyl alcohol copolymer (EVOH), vinylidene chloride and the like. An aluminum foil can also be used for the gas barrier layer.

  The light shielding layer is a colored layer. Examples of the color of the light shielding layer include white, black, gray, red, brown, and blue. The light shielding layer may contain a pigment exhibiting these colors. As the pigment, for example, a pigment or a dye can be used.

  The laminate 100 may have a printed layer or a coat layer on the outer surface 115 a of the base material layer 115.

  The printing layer can impart discriminability and designability to the inner bag 1 by printing ink on the surface (surface 115a) of the base material layer 115.

(Adhesive layer)
The adhesive layer 116 of this embodiment adheres the outer sealant layer 114 to the base material layer 115. The adhesive layer 116 of the present embodiment preferably includes an anchor agent such as polyurethane, polyether, alkyl titanate (organic titanium compound), or an adhesive resin such as acid-modified polyolefin. Especially, it is preferable that the adhesive bond layer 116 contains a polyurethane-type resin from an adhesive viewpoint.

(Outer sealant layer)
In the outer sealant layer 114 of this embodiment, a first outer sealant layer 111, a second outer sealant layer 112, and a third outer sealant layer 113 are laminated in this order from the base material layer 115 side. Each sealant layer is formed from a polyolefin resin, and is preferably formed from polyethylene.

  The first outer sealant layer 111 of this embodiment is a layer that adheres to the base material layer 115 via the adhesive layer 116. It is preferable that the 1st outer side sealant layer 111 of this embodiment contains polyolefin resin derived from petroleum. Thereby, the adhesiveness of the 1st outer side sealant layer 111 with respect to the base material layer 115 can be made favorable. The first outer sealant layer 111 and the third outer sealant layer 113 can have a biomass degree of 50% or less from the viewpoint of adhesion, 30% or less, 10% or less, or 0%. . At this time, the content of petroleum-derived polyolefin (degree of petroleum origin) is 50% or more, 70% or more, 90% or more, and 100%, corresponding to each.

  The second outer sealant layer 112 of the present embodiment functions as an intermediate layer located between the first outer sealant layer 111 and the third outer sealant layer 113. The film thickness of the second outer sealant layer 112 is preferably 20% or more with respect to the film thickness of the outer sealant layer 114, preferably 30% or more, and can also be 40% or more. . The polyolefin resin, which is a material for forming the second outer sealant layer 112 of the present embodiment, preferably has a biomass degree of 50% or more and 100% or less. When the degree of biomass of the polyolefin resin is 50% or more, the amount of petroleum resources used can be reduced and the burden on the environment can be reduced. Furthermore, from the viewpoint of reducing the environmental load, the biomass degree of the polyolefin resin is preferably 80% or more, and the biomass degree is preferably 100%.

  Furthermore, the laminated body 100 which has a softness | flexibility compared with the laminated body which consists of petroleum-derived polyolefin as the biomass degree of the said polyolefin resin is 50% or more is obtained. From this, the inner bag 1 obtained from the laminated body 100 becomes easy to handle.

  The third outer sealant layer 113 of the present embodiment is a layer that is sealed to the inner laminate 120 described later at the contact portions on the four sides of the flat surface portion 7. The third outer sealant layer 113 of the present embodiment preferably includes a petroleum-derived polyolefin resin. Thereby, the adhesiveness of the 3rd outer side sealant layer 113 with respect to the inner side laminated body 120 can be made favorable.

[Inner laminate]
The inner laminate 120 of this embodiment is located inside the outer laminate 110. The inner laminate 120 of the present embodiment has an inner sealant layer 124. In the present specification, the “inner sealant layer 124” corresponds to the “sealant layer” in the claims.

  In the inner sealant layer 124 of the present embodiment, the first inner sealant layer 121, the second inner sealant layer 122, and the third inner sealant layer 123 are laminated in this order from the inner side of the inner bag 1 of the present embodiment. . Each sealant layer is formed from a polyolefin resin, and is preferably formed from polyethylene.

  The first inner sealant layer 121 of this embodiment is a layer that is sealed to the pair of side surface portions 10. It is preferable that the 1st inner side sealant layer 121 of this embodiment contains polyolefin resin derived from petroleum. Thereby, the adhesiveness of the 1st inner side sealant layer 121 with respect to a pair of side part 10 can be made favorable.

  The second inner sealant layer 122 of the present embodiment functions as an intermediate layer located between the first inner sealant layer 121 and the third inner sealant layer 123. The polyolefin resin, which is a material for forming the second inner sealant layer 122 of the present embodiment, preferably has a biomass degree of 50% or more and 100% or less. When the degree of biomass of the polyolefin resin is 50% or more, the amount of petroleum resources used can be reduced and the burden on the environment can be reduced. Furthermore, from the viewpoint of reducing the environmental burden, the biomass degree of the polyolefin resin is preferably 80% or more.

  Furthermore, the laminated body 100 which has a softness | flexibility compared with the laminated body which consists of petroleum-derived polyolefin as the biomass degree of the said polyolefin resin is 50% or more is obtained. From this, the inner bag 1 obtained from the laminated body 100 becomes easy to handle.

  The third inner sealant layer 123 of the present embodiment is a layer that is sealed to the third outer sealant layer 113 of the outer laminate 110 at the contact portions on the four sides of the plane portion 7. When the third outer sealant layer 113 of the present embodiment includes a biomass-derived polyolefin resin, the third inner sealant layer 123 preferably includes a petroleum-derived polyolefin resin. Thereby, the adhesiveness of the 3rd inner side sealant layer 123 with respect to the 3rd outer side sealant layer 113 can be made favorable.

  When the third outer sealant layer 113 of this embodiment includes a petroleum-derived polyolefin resin, the third inner sealant layer 123 may include a petroleum-derived polyolefin resin or a biomass-derived polyolefin resin. . Since the adhesion between the third outer sealant layer 113 and the third inner sealant layer 123 can be improved, both the third outer sealant layer 113 and the third inner sealant layer 123 include a petroleum-derived polyolefin resin. Is more preferable.

  The third outer sealant layer 113 and the third inner sealant layer 123 that the flat surface part 7 has, and the third outer surface that the side surface part 10 has in the contact portion between the flat surface part 7 and the side surface part 10 that face the four sides of the flat surface part 7. The sealant layer 113 and the third inner sealant layer 123 are sealed.

  The layer configuration of the stacked body 100 in the plane portion 7 has been described above. The side surface portion 10 is composed of a laminate 100A having the same layer configuration as the laminate 100.

  As shown in FIG. 4, in the side seal portion 16 that is the four contact portions of the plane portion 7, the inner laminate 120 in the plane portion 7 and the inner laminate 120 </ b> A in the side portion 10 are arranged to face each other. The third inner sealant layer 123 of the inner laminate 120 and the third inner sealant layer 123A of the inner laminate 120A are sealed. Further, the outer laminated body 110A in the side surface portion 10 and the inner laminated body 120A in the side surface portion 10 are arranged to face each other, and the third outer sealant layer 113A of the outer laminated body 110A and the first inner sealant of the inner laminated body 120A. The layer 121A is sealed. Thereby, the inner bag 1 of this embodiment is formed in the bag shape.

  According to the first embodiment, a new bag-in-box with a low environmental load is provided.

Second Embodiment
Hereinafter, a bag-in-box according to a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

≪Bag in box≫
The bag in box of 2nd Embodiment has the inner bag 2 instead of the inner bag 1 of 1st Embodiment. FIG. 5 is a perspective view showing the inner bag 2 of the present embodiment.

<Inner bag>
The inner bag 2 of this embodiment has a space in which contents can be accommodated. The contents accommodated in the inner bag 2 of this embodiment are the same as those of the first embodiment.

  The inner bag 2 of the present embodiment is obtained by bonding a single-layer resin-formed product having irregularities. The inner bag 2 may have an uneven structure with a height of 0.01 mm or more and 2.0 mm or less on the outer surface. Thereby, it is easy to grasp the inner bag 2 of this embodiment and to handle the inner bag 2.

As shown in FIG. 5, the inner bag 2 of the present embodiment includes a pair of container portions 3. The pair of container parts 3 constitutes an upper container part 5 and a lower container part 6. The upper container part 5 has a spout 4.
The edge 50 of the opening of the upper container 5 is sealed with the edge 60 of the opening of the lower container 6 facing each other.

  The inner bag 2 of the present embodiment is a resin molded product formed from biomass-derived polyolefin resin, and the biomass-derived polyolefin resin is preferably biomass-derived polyethylene.

  The biomass degree of the forming material of the inner bag 2 is preferably 40% or more and 100% or less. The inner bag 2 which has a softness | flexibility compared with the inner bag which consists of petroleum-derived polyolefin as the biomass degree of the said formation material is 40% or more is obtained. For this reason, the inner bag 2 is easy to handle. Moreover, when the biomass degree of the forming material is 40% or more, a component having a low biomass degree is likely to bleed out to the surface, and the friction between the box body 201 made of cardboard and the inner bag 2 is reduced. The inner bag 2 can be easily taken in and out of the box body 201 by the effect derived from such a forming material and the effect derived from the uneven structure described above.

The inner bag 2 of the present embodiment has flexibility and can be stored in a folded state before use. Specifically, one container part 3 (for example, the lower container part 6) is placed on the other container part 3 (for example, the virtual surface including the upper side seal part 24, the bottom part seal part 25, and the diagonal part seal part 26). The inner bag 2 can be folded inside by being pushed into the upper container part 5) side. In a state where the inner bag 2 is folded, the upper side seal part 24, the bottom side seal part 25, and the diagonal part seal part 26 are mountain-folded.
In the present specification, the upper side seal part 24, the bottom side seal part 25, and the diagonal part seal part 26 correspond to contact portions.

  According to the second embodiment, as in the first embodiment, a new bag-in-box with a low environmental load is provided.

  In addition, the inner bag which concerns on this invention is not limited to the said embodiment, What is necessary is just to show a bag shape by using the laminated body which has a sealant layer as a forming material, and bonding sealant layers together.

  Moreover, the inner bag 1 which concerns on this invention is not limited to the said embodiment, It is preferable that any one or both of the outer side sealant layer 114 and the inner side sealant layer 124 contain biomass-derived polyolefin resin. Thereby, the bag-in-box which concerns on this invention can reduce the usage-amount of petroleum resources, and can reduce the load to an environment.

  DESCRIPTION OF SYMBOLS 1, 2 ... Inner bag, 3 ... Container part, 4 ... Spout, 7 ... Plane part, 8 ... Front part, 9 ... Rear surface part, 10 ... Side part, 13 ... Folded part, 100, 100A ... Laminate body, 110 , 110A ... outer laminated body, 111 ... first outer sealant layer, 112 ... second outer sealant layer, 113, 113A ... third outer sealant layer, 114 ... outer sealant layer, 114a, 115a ... face, 115 ... base material layer 116 ... Adhesive layer, 120, 120A ... Inner laminate, 121, 121A ... First inner sealant layer, 122 ... Second inner sealant layer, 123, 123A ... Third inner sealant layer, 124 ... Inner sealant layer, 200 ... Bag in box, 201 ... Box body

Claims (2)

A box body made of corrugated cardboard; and
A flexible inner bag housed inside the box body;
A spout joined to the inner bag,
The inner bag is a single-layer resin molded product formed from a material containing a polyolefin resin having a biomass degree of 40% or more and 100% or less,
The inner bag includes a pair of container parts,
The edge of the opening of one container part is sealed to the edge of the opening of the other container part facing each other,
Can be folded inside the inner bag by pushing one of the container parts inward from the contact part between the edge part of the opening part of one container part and the edge part of the opening part of the other container part And
The single-layer resin molded product has irregularities with a height of 0.01 mm or more and 2.0 mm or less on the outer surface,
The spout is connected to at least one of the container portions ;
The spout is a bag-in-box that is an injection-molded product of polyethylene resin having a biomass degree of 40% to 80% . A box body made of corrugated cardboard; and
A flexible inner bag housed inside the box body;
A spout joined to the inner bag,
The inner bag is a method for manufacturing a bag-in-box comprising a pair of container parts,
A step of obtaining the spout by injection molding a polyethylene resin having a biomass degree of 40% or more and 80% or less;
Joining the spout to at least one of the container parts,
As each container part, using a single-layer resin molded product formed from a material containing a polyolefin resin having a biomass degree of 40% or more and 100% or less,
The method for manufacturing a bag-in-box, wherein the single-layer resin molded product has irregularities having a height of 0.01 mm or more and 2.0 mm or less on an outer surface.

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