JP7388034B2 - packaging bag - Google Patents

Description

The present invention relates to a packaging bag made by stacking and heat-sealing laminated films.

BACKGROUND ART Packaging bags (containers) that contain contents and can easily pour out the contents from a spout have been known (for example, see Patent Document 1). When taking out the contents from such a packaging bag, the contents are poured out from the spout by holding the packaging bag with your hand and pressing the container containing the contents.
However, if the contents are cold items that have been refrigerated or frozen, the packaging bag itself that contains the contents is also as cold as the contents, so when pouring out the contents from the packaging bag, your hands may become numb. In some cases, the contents may not be pushed out sufficiently or the packaging bag containing the contents may not be able to be held.

Japanese Patent Application Publication No. 10-59388

An object of the present invention is to provide a packaging bag that is easy to handle even when the contents are cold without making your hands feel numb.

The present invention solves the above problems by the following solving means. Note that, in order to facilitate understanding, the description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto.

The first invention has a front surface portion (21) and a back surface portion (22) composed of a laminated film (60) including at least a base material layer (61) and a sealant layer (64), and contains contents. A bag main body portion ( 5); and a heat insulating adhesive member (50) provided on the bag body, wherein the heat insulating adhesive member covers the surface portion and the body in a plan view of the bag body. The heat insulating adhesive member is provided in a region of the back surface that overlaps at least a portion of the housing part, and the heat insulating adhesive member is provided with a plurality of concave shapes (51) on both surfaces thereof, and the concave shape is formed equally on both sides of the bag body, and the average value of the diameters of the concave openings opening on the side facing the bag body is defined as D ^ave ₁ , and the openings on the side opposite to the bag body are The packaging bag satisfies _the relationship |D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ ≦0.5, where D ^ave 2 is the average value of the diameters of the respective concave openings.

In a second aspect of the invention, in the packaging bag (1) of the first aspect, the heat insulating adhesive member (50) is arranged in the surface portion ( 21) and a packaging bag provided on the back surface portion (22).

A third invention is the packaging bag (1) of the first invention or the second invention, in which the heat insulating adhesive member (50) is attached to the sealing part (4) in a plan view of the bag body part (5). and a packaging bag that is provided avoiding an area that overlaps with the seal scheduled portion (4a).

A fourth invention is the packaging bag (1) according to the third invention, wherein the heat insulating adhesive member (50) is provided at a position 2 mm or more away from the sealing portion (4) and the sealing portion (4a). It is a packaging bag.

A fifth invention is the packaging bag (1) according to any one of the first to fourth inventions, in which the heat insulating adhesive member (50) is arranged on the front surface part (21) and on the back surface part (22). A packaging bag is placed on top.

A sixth invention is the packaging bag according to any one of the first invention to the fifth invention, in which the chilled contents are accommodated in the storage section (2).

According to the present invention, even when the contents are cold, it is possible to easily handle the contents without getting tired.

It is a top view showing the appearance of a packaging bag of an embodiment. It is a perspective view of a packaging bag containing contents of an embodiment. It is a sectional view of the laminated film used for the bag main part of an embodiment. It is a figure which shows an example of the method of providing a heat insulating adhesive member on a bag main body part. FIG. 2 is a diagram showing an apparatus for manufacturing a heat insulating adhesive member. It is a figure explaining the manufacturing method of a heat insulating adhesive member. This is an enlarged photograph taken from the front direction of the adhesive surface of the heat insulating adhesive member of the example. FIG. 2 is an enlarged cross-sectional view of the heat insulating adhesive member of the example in a direction perpendicular to the sheet surface. It is a figure showing the peeling force of an example and a comparative example. 3 is a diagram showing the observation results of sample 1. FIG. FIG. 3 is a diagram showing the observation results of sample 2. FIG. 7 is a diagram showing the observation results of sample 3. FIG. 4 is a diagram showing the observation results of sample 4.

Embodiments of the present invention will be described below with reference to the drawings and the like.
Note that each figure shown below, including FIG. 1, is a schematic diagram, and the size and shape of each part are appropriately exaggerated for easy understanding.
In addition, although words such as sheet and film are used, these are generally used in descending order of thickness, and this specification will follow suit. ing. However, since there is no technical meaning in these different uses, these words can be replaced as appropriate.
Further, numerical values such as dimensions and material names of each member described in this specification are merely examples of embodiments, and the present invention is not limited thereto, and may be appropriately selected and used.

In this specification, terms that specify shapes or geometrical conditions, such as terms such as parallel and orthogonal, do not have a strict meaning, but also have a similar optical function and are used to the extent that they can be considered parallel or orthogonal. This also includes states with errors.
In this specification, the sheet surface (film surface) refers to the surface of each sheet (film) that is in the plane direction of the sheet (film) when viewed as a whole. do.

(Embodiment)
FIG. 1 is a plan view showing the appearance of the packaging bag of this embodiment.
FIG. 2 is a perspective view of a packaging bag containing the contents of this embodiment.

The packaging bag 1 of this embodiment is a container that encloses the contents of refrigerated or frozen food such as confectionery (ice cream, gel), etc. As shown in FIG. 1, the packaging bag 1 includes a storage part 2 that stores contents, a spout 3 that can pour out the contents from the storage part 2, a seal part 4 that surrounds the storage part 2, and a storage part 2. The bag main body part 5 includes a sealing part 4a provided around the part 2 as needed, and heat insulating adhesive members 50 provided on the front and back sides of the bag main body part 5.

(Bag body)
As shown in FIGS. 1 and 2, the bag body 5 of the packaging bag 1 is made of a flexible laminated film. The laminated film constituting the bag main body part 5 includes a front film 21 (front surface part) forming the front surface, a back film 22 (back surface part) forming the back surface, and 2 layers forming the gusset folded parts of the left and right side parts 33. side film 23 (23a, 23b). That is, the bag main body portion 5 has a side gusset bag shape with a gusset folded portion on the side portion 33. From a different perspective, the bag main body 5 has a front surface formed by the front film 21, a back surface formed by the back film 22, and a side surface formed by the gusset folds (side film 23) of the side parts 33. have

In this embodiment, the front film 21 and the back film 22 are composed of substantially rectangular laminated films. A substantially rectangular shape is not limited to a geometric rectangle, but includes a shape that is recognized as a rectangle when viewed as a whole. For example, one or more of the side edges, bottom edge, or top edge may include a curved portion. Further, the corners of the laminated film may be rounded in an outwardly convex arc shape.

The gusset folding portion is provided on the side portion 33 of the bag body portion 5. When the contents are stored in the storage portion 2, the gusset folding portion is fully expanded. Therefore, the volume of the accommodating part 2 can be increased compared to the case of a flat pouch that does not have a gusset folded part on the side. On the other hand, when no contents are stored in the accommodating part 2, the side film 23 forming the gusset folded part is formed into a substantially rectangular shape and is folded back so that a folded part 35 is formed on the accommodating part 2 side. It will be done. This reduces the overall thickness of the bag main body portion 5.

Further, the front film 21, the back film 22, and the side film 23 may be separate laminated films or may be continuous laminated films before the bag body 5 is formed. In the case of a continuous laminated film, any two or more of the front film 21, the back film 22, and the side film 23 may be connected. The connected laminated films are bent to form any two or more of a front film 21, a back film 22, and a side film 23.

In this embodiment, the bag main body 5 is formed of a front film 21, a back film 22, and two side films 23, which are individually configured.
In the side part 33 of the bag body part 5, the front film 21, the side film 23a, the back film 22, and the side film 23b are heat-sealed (thermal welded) to the side parts of adjacent films so that a cylindrical shape is formed. joined by. By this joining, side seals are formed between the front film 21 and the side film 23a, between the side film 23a and the back film 22, between the back film 22 and the side film 23b, and between the side film 23b and the front film 21. A section 43 is formed.
Note that the inner side of the cylindrical shape formed by the front film 21, the side film 23a, the back film 22, and the side film 23b serves as the housing portion 2.

In the upper part 31 of the bag body part 5, the front film 21, the side film 23a, the back film 22, and the side film 23b are joined by the side seal part 43, and the two side films 23 are the front film 21 and the back film 22. The upper part of each film is joined by heat sealing in a state of being folded into two by the folding part 35 toward the housing part 2 between them. Here, the upper part on the front side of the side film 23 folded in half at the folding part 35 is joined to the front film 21, and the upper part on the back side is joined to the back film 22. As a result, an upper seal portion 41 is formed in the upper portion 31 of the bag body portion 5.
Here, the spout 3 is joined to the center of the upper part 31 of the front film 21 and the back film 22 so as to be sandwiched between the front film 21 and the back film 22. At this time, the spout 3 is joined such that one end thereof penetrates into the accommodating part 2 side, and the other end, on which the opening/closing lid is formed, protrudes from the upper part 31 of the bag body part 5.

In addition, in the lower part 32 of the bag body part 5, the front film 21, the side film 23a, the back film 22, and the side film 23b are joined to each other by the side seal part 43, and the two side films 23 are the front film 21 and the back film. The lower part of each film is joined by heat sealing in a state of being folded into two by the folding part 35 toward the housing part 2 between the films 22. Here, the lower part on the front side of the side film 23 folded in half at the folding part 35 is joined to the front film 21, and the lower part on the back side is joined to the back film 22. As a result, a lower seal portion 42 is formed in the lower portion 32 of the bag body portion 5.

In addition, before the bag main body part 5 accommodates the contents, at least one seal part among the upper seal part 41, the lower seal part 42, and the side seal part 43 is in an unsealed scheduled seal part 4a. The contents can be hermetically sealed by storing the contents into the storage section 2 from this sealing planned section 4a and heat sealing (joining) the sealing planned section 4a.
In the bag main body part 5 of this embodiment, before the contents are stored in the storage part 2, the upper seal part 41 and the side seal part 43 are formed as the seal part 4 to surround the storage part 2, and the lower part The portion where the seal portion 42 is formed becomes the unsealed portion 4a. The contents can be sealed in the storage section 2 of the bag main body section 5 by storing the contents from the unsealed sealed portion 4a into the storage section 2 and forming the lower seal section 42 by heat sealing. can.

Note that the method for filling the contents is not limited to this. For example, before the contents are stored in the storage section 2, the lower seal section 42 and the side seal section 43 are used as the seal section 4 to fill the storage section 2. The portion where the upper seal portion 41 is formed is an unsealed portion 4a to be sealed, and the contents may be filled from this portion 4a.
In addition, the sealing portion that will be in an unsealed state is omitted, and the upper seal portion 41, lower seal portion 42, and side seal portion 43 are formed as the seal portion 4 to surround the storage portion 2 before filling with the contents. Then, the contents may be filled into the storage part 2 from the spout 3.

(Laminated film)
FIG. 3 is a cross-sectional view of the laminated film used in the packaging bag of this embodiment.
The front film 21 (front part), the back film 22 (back part), and the side film 23 that constitute the bag main body part 5 are made of a laminated film 60. FIG. 3 shows the layer structure of the laminated film 60. As described above, the bag main body 5 is made by heat-sealing the laminated film 60, which is a pair of front films 21, a back film 22, and two side films 23 (23a, 23b). For this reason, the laminated film 60 is provided with a sealant layer 64 having sealing properties on the inner side of the container.
Furthermore, in the bag main body portion 5 of this embodiment, the base material layer 61 serving as a printing base material is provided in a portion that is closer to the outer side of the container than the sealant layer 64. Furthermore, the laminated film 60 includes an intermediate layer 63 to provide various functions required as a packaging bag for storing refrigerated or frozen contents. Therefore, the laminated film 60 having such a layer structure has a base layer 61 and an intermediate layer 63 from the side that will be the outside of the container to the side that will be the inside of the container when the bag body 5 is made into a bag. and a sealant layer 64 in this order. Each layer will be explained in detail below.

The base material layer 61 is a layer that becomes the basis of the laminated film 60, and becomes the outermost layer when the bag main body portion 5 is formed. For example, the base material layer 61 may be a stretched polyethylene terephthalate (PET) film, a silica-deposited stretched polyethylene terephthalate film, an alumina-deposited stretched polyethylene terephthalate film, a stretched polybutylene terephthalate film, a stretched polyamide film, a stretched polypropylene film, or two or more of these. A composite film obtained by laminating films can be used.

Preferably, the base material layer 61 is subjected to a biaxial stretching process. Thereby, the molecules forming the base material layer 61 are aligned in the stretching direction by the stretching process, and the base material layer 61 comes to exhibit excellent dimensional stability.

The thickness of such a base material layer 61 is, for example, approximately 1 to 50 μm. In this case, the product cost can be reduced while satisfying the strength, rigidity, etc. required for the bag main body portion 5. Note that the base material layer 61 of this embodiment also functions as a layer of the laminated film 60 that is located furthest outside the container when the bag body portion 5 is formed into a bag.

Further, as shown in FIG. 3, in this embodiment, a pattern layer 62 including a pattern is laminated on the surface of the base material layer 61 that faces inside the container. Here, the term "picture" refers to a recording target in various forms that can be recorded or printed on the base material layer 61, and includes, without particular limitation, a figure, character, pattern, pattern, symbol, design, mark, etc. Widely included. In particular, the laminated film 60 used in the bag body 5 intended to contain food contains information such as a diagram of the contents, a product name of the contents, an expiration date, a manufacturing date, and a manufacturing number as a pattern. The characters shown are used. However, the pattern layer 62 is laminated on the base material layer 61 according to the specifications of the product, and the pattern layer 62 does not need to be provided on the base material layer 61.

In this embodiment, the pattern layer 62 is applied not to the outer surface of the base layer 61 on the outer side of the container but to the inner surface of the base layer 61. In this case, since the pattern layer 62 has excellent abrasion resistance, it can effectively prevent disappearance due to rubbing, etc., and can also effectively prevent the pattern from being tampered with. In addition, the base material layer 61 has transparency so that the pattern layer 62 laminated on the inner surface of the base material layer 61 can be visually recognized through the base material layer 61 when the packaging bag 1 is made into a bag. It is preferable that you do so.

As described above, the sealant layer 64 is provided for bonding and sealing the two laminated films 60 by overlapping the two laminated films 60 and heat-sealing the opposing edges. Furthermore, in this embodiment, the sealant layer 64 is arranged on the side of the laminated film 60 that is closest to the inside of the container (the side of the accommodating section 2) when the bag body 5 is made into a bag.

Such a sealant layer 64 may be a film made of polyolefin resin such as polyethylene (PEF), polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene block copolymer, or a conventionally known easy-peel film. Can be adopted. Further, as the sealant layer 64, a film of ionomer resin, ethylene-acrylic acid copolymer, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, acid-modified polyolefin resin, etc. is used. It can also be adopted.
The sealant layer 64 may be configured as a single layer by a film made of these materials, or may be configured as a multilayer.

Further, the sealant layer 64 can also be made of unstretched polypropylene (CPP). Further, from the viewpoint of impact resistance, the sealant layer 64 may be made of a low density polyethylene film (LDPE) or a linear low density polyethylene (LLDPE).
The thickness of the sealant layer 64 is preferably in the range of 10 μm or more and 200 μm or less. In this case, the packaging bag 1 has excellent impact resistance against drops that may occur during the distribution process, and also has excellent handling properties such as ease of filling and refilling the contents.

On the other hand, the intermediate layer 63 laminated between the base material layer 61 and the sealant layer 64 is provided to supplement various functions required of the packaging bag. As described above, the bag main body 5 is a packaging bag suitable for containing food as contents. Therefore, in order to preserve the contents while preventing deterioration such as oxidation of the contents, the intermediate layer 63 has vapor barrier properties that prevent the permeation of water vapor and gases such as oxygen gas. It may have gas barrier properties. Further, the intermediate layer 63 may have bending resistance and impact resistance so that it can sufficiently withstand the impact when the packaging bag 1 falls from a product shelf. Furthermore, the intermediate layer 63 may have a function of sufficiently increasing concealment so that the contents of the packaging bag 1 cannot be seen, in order to increase the consumer's desire to purchase.

As the intermediate layer 63 having such a function, for example, polyethylene terephthalate, polyamide, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyvinyl alcohol, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. A film made of a compound or the like can be used. Furthermore, a film obtained by coating polyvinylidene chloride on the above-mentioned film or a film obtained by vapor-depositing an inorganic material such as silicon oxide or aluminum oxide can be used. The thickness of such intermediate layer 63 is preferably in the range of 5 μm or more and 200 μm or less.

Here, the intermediate layer 63 may be formed by laminating two or more layers with a bonding layer 65 to be described later interposed therebetween, or may be a combination of one or more of the above-mentioned base materials.
Moreover, the intermediate layer 63 may include a foamed resin layer via the bonding layer 65 in addition to the above-mentioned functional layer such as a barrier. The foamed resin layer has a function of improving the heat insulation properties of the laminated film 60, and is made of polyethylenes such as polyurethane, low density polyethylene, linear low density polyethylene, medium density polyethylene, and high density polyethylene, homopolypropylene, and random polyethylene. It is formed from a film of polypropylene such as polypropylene or block polypropylene, or copolymer resin such as ethylene-vinyl acetate copolymer or ethylene-propylene copolymer. For the foamed resin layer, for example, a chemical foaming method in which nitrogen gas or carbon dioxide gas is generated using azodicarbonamide, sodium hydrogen carbonate, etc., or a physical foaming method using gases such as carbon dioxide gas (carbon dioxide gas) or nitrogen gas is used. It is formed by
The thickness of the foamed resin layer is preferably in the range of 70 μm or more and 250 μm or less.
Note that the foamed resin layer may be provided in the intermediate layer 63 closer to the base layer 61 than the functional layer such as the barrier described above, and may be provided closer to the sealant layer 64 than the functional layer such as the barrier described above. It may be provided on the side.

As shown in FIG. 3, in this embodiment, a bonding layer 65 is interposed between the base layer 61 and the intermediate layer 63 and between the intermediate layer 63 and the sealant layer 64. Further, when the intermediate layer 63 is composed of a plurality of functional layers, a bonding layer 65 is also interposed between each functional layer. As this bonding layer 65, for example, an adhesive commonly used in the dry lamination method, which is known per se, can be used, such as a polyvinyl acetate adhesive, a polyacrylic acid ester adhesive, or a cyanoacrylate adhesive. , ethylene copolymer adhesive, cellulose adhesive, polyester adhesive, polyamide adhesive, amino resin adhesive, epoxy adhesive, polyurethane adhesive, etc. can be used.

For example, the laminated film 60 can be formed with the following layer configuration in order from the base material layer 61 side.
1) Base material layer (biaxially stretched PET film) / pattern layer / bonding layer / intermediate layer (metal (aluminum) vapor deposited PET film) / bonding layer / sealant layer (polyethylene film)
2) Base material layer (biaxially stretched polyamide film) / pattern layer / bonding layer / intermediate layer (metal (aluminum) vapor deposited PET film) / bonding layer / sealant layer (polyethylene film)
3) Base material layer (biaxially stretched polybutylene terephthalate film) / pattern layer / bonding layer / intermediate layer (metal (aluminum) vapor deposited PET film) / bonding layer / sealant layer (polyethylene film)
4) Base layer (biaxially stretched PET film) / pattern layer / bonding layer / intermediate layer (biaxially stretched polyamide film) / bonding layer / sealant layer (polyethylene film)
5) Base layer (biaxially stretched PET film) / pattern layer / bonding layer / intermediate layer (biaxially stretched polybutylene terephthalate film) / bonding layer / sealant layer (polyethylene film)

(Insulating adhesive member)
The heat insulating adhesive member 50 is a member having elasticity, adhesiveness and heat insulating properties, and as shown in FIGS. ) is provided in a region overlapping with the storage portion 2 on the outer surface of each container. More specifically, the heat-insulating adhesive member 50 includes a front-side heat-insulating adhesive member 50a and a back-side heat-insulating adhesive member 50b, and a region where the front-side heat-insulating adhesive member 50a and the back-side heat-insulating adhesive member 50b overlap with the housing portion 2. In addition, when viewed from the side of the packaging bag 1, the heat insulating adhesive members 50 are provided at positions that are plane symmetrical, in other words, when viewed from above, the respective heat insulating adhesive members 50 are provided at positions overlapping on the front and back surfaces.
Further, the heat insulating adhesive member 50 is provided so as to avoid an area overlapping with the seal portion 4 and the sealing scheduled portion 4a of the bag body portion 5. The heat insulating adhesive member 50 of the present embodiment is formed into a substantially rectangular shape in plan view, and has an area that overlaps with the housing portion 2 and is intended for sealing of the sealing portion 4 (each of the upper sealing portion 41 and the side sealing portion 43). It is provided in a region 2 mm or more away from the portion 4a (lower seal portion 42).

When the bag is filled with refrigerated or frozen contents, the bag body 5 itself becomes cold, so the hands (fingers) of the user who handles the packaging bag become numb, and the user may become unable to hold the packaging bag. However, as mentioned above, by providing the heat insulating adhesive member 50 on the bag body 5, the user's hands (fingers) may not be easily poured out from the spout. It is possible to prevent this from happening as much as possible.
Specifically, the user grasps the bag main body 5 via the heat insulating adhesive member 50 provided on the front film 21 (front part) and the back film 22 (back part) of the bag main body 5. The packaging bag 1 can be easily carried without becoming stale.
In addition, after opening the spout 3 of the packaging bag 1, the user may crush the accommodating portion 2 of the bag body 5 with his/her hand (finger) via the heat insulating adhesive member 50, thereby preventing the user's hands from becoming numb. The contents can be pushed out from the spout 3 without any trouble.

Here, the sealing part 4 and the sealing part 4a of the bag body part 5 and the vicinity of the sealing part 4 and the sealing part 4a are the same even if the contents stored in the storage part 2 are refrigerated or frozen. This is a part that is not easily affected by the temperature of the contents, and even if you grab such a part, it is extremely unlikely that your hands will get numb, and there is little need for insulation. Therefore, as described above, the heat insulating adhesive member 50 is placed in an area that is 2 mm or more away from the sealing part 4 and the sealing part 4a, avoiding the area overlapping with the sealing part 4 and the sealing part 4a of the bag body part 5. It is provided. Thereby, it is possible to prevent the heat insulating adhesive member 50 from being provided on the front and back sides of the bag body 5 more than necessary, and it is possible to prevent the cost of the packaging bag 1 from increasing.

The heat insulating adhesive member 50 includes a plurality of concave shapes 51 that are open on both sides thereof. Since the plurality of concave shapes 51 each act as a fine suction cup, it is possible to exert adhesive force (adsorption force) to the laminated films such as the front film 21 and the back film 22. In addition, since the heat insulating adhesive member 50 has an adhesive surface (concave shape 51) exposed on the side opposite to the laminated film, the user's fingers or the like may slip when handling the packaging bag 1. It is possible to exert a so-called anti-slip effect, which prevents the user from failing to grasp the object.
Further, the heat insulating adhesive member 50 has the above-mentioned heat insulating function due to the concave shape 51 and also has elasticity.
Furthermore, the heat insulating adhesive member 50 has a reattachment property due to the concave shape 51. Therefore, after peeling off the heat insulating adhesive member 50 from the laminated film, it is possible to paste it again.

The heat insulating adhesive member 50 is formed, for example, by a manufacturing method described below using a liquid resin composition (acrylic emulsion) disclosed in JP-A No. 2017-36404. The thickness t of the heat insulating adhesive member 50 is preferably 1 μm or more and 500 μm or less. If the thickness falls below the lower limit of the above-mentioned thickness range, it becomes difficult to form a concave shape, or the size of the concave shape becomes too small, resulting in a decrease in adhesive (adsorption) properties. Moreover, when the upper limit of the above thickness range is exceeded, the flexibility of the heat insulating adhesive member 50 decreases, and the ability to follow the deformation of the bag main body 5, which is the adherend, deteriorates.
Furthermore, in order to uniformly provide the concave shapes 51 on both sides of the heat insulating adhesive member 50, it is desirable that the thickness t of the heat insulating adhesive member 50 falls within the range of 20 μm≦t≦40 μm. This point will be discussed later.

The size and density of the concave shape 51 of the heat insulating adhesive member 50 can be adjusted by changing various conditions in the manufacturing process described below. For example, the density of the heat insulating adhesive member 50 can be used as an index representing the extent to which the concave shape 51 is included. The density of the heat insulating adhesive member 50 is not particularly limited, but may be, for example, 0.1 g/cm ³ or more and 0.6 g/cm ³ or less. Further, the size of the concave shape 51 is not particularly limited, but may be, for example, 1 μm or more and 300 μm or less.
As shown in FIG. 4(a), the heat insulating adhesive member 50 of this embodiment has releasable base sheets 55 and 56 attached to its front and back surfaces before being attached to the bag body 5. Specifically, a first releasable base sheet 55 is attached to the front surface of the heat insulating adhesive member 50, and a second releasable base sheet 56 is attached to the back surface of the heat insulating adhesive member 50. Protects 50 adhesive surfaces. One of the releasable base sheets 55 and 56 is peeled off from the heat insulating adhesive member 50 when attached to the bag body 5. The other releasable base sheet is peeled off after the heat insulating adhesive member 50 is attached to the bag body 5.

As the releasable base sheets 55 and 56, various forms of conventionally known release films, separate paper, separate films, separation paper, release films, release paper, etc. can be used as appropriate. For example, high-quality paper, coated paper, impregnated paper, plastic film, etc. with a release layer formed on one or both sides may be used. The release layer is not particularly limited as long as it has release properties, but examples include silicone resins, organic resin-modified silicone resins, fluororesins, aminoalkyd resins, melamine resins, acrylic resins, polyester resins, etc. can be mentioned. These resins can be of emulsion type, solvent type or non-solvent type. When using a release film provided with a release layer, for example, silicone release type PET (polyethylene terephthalate) film, untreated PET film, PP film, silicone release type paper, etc. can be used.

The thickness of the releasable base sheets 55 and 56 is preferably, for example, 10 μm or more and 100 μm or less, and more preferably 20 μm or more and 60 μm or less. If the thickness is below the lower limit of the above thickness range, it will not have firmness and will be difficult to peel off. Moreover, if the upper limit of the above thickness range is exceeded, the stiffness will be too strong and the workability during pasting will be reduced.
Furthermore, as the removable base sheets 55 and 56, commercially available ones may be used. For example, a 38 μm thick polyester film (Mitsui Chemicals Co., Ltd., product name: SP-PET-01).

FIG. 4 is a diagram illustrating an example of a method of providing the heat insulating adhesive member 50 on the bag body 5. As shown in FIG.
The heat insulating adhesive member 50 described above includes releasable base sheets 55 and 56, as shown in FIG. 4(a). When attaching the heat insulating adhesive member 50 to the bag body 5, the releasable base sheet 56 is peeled off (FIG. 4(b)). Then, by pasting the exposed adhesive surface of the heat insulating adhesive member 50 on the surface of the bag body 5 on the outer side of the container and applying appropriate pressure to that surface, a large number of adhesive surfaces present on the exposed surface of the heat insulating adhesive member 50 are attached. Due to the elastic deformation of the concave shape 51, it becomes adsorbed (adhesive) to the bag main body part 5 by an action similar to that of a conventional micro suction cup (FIG. 4(c)).
That is, due to the elastic deformation around the concave shape 51, a force acts on the concave shape 51 to return it from the deformed state to its original shape. This force creates a negative pressure in the sealed space within the concave shape 51, causing an adsorption action on the bag body 5. Although the suction force of the concave shape 51 alone is weak, since a large number of concave shapes 51 are formed, the necessary suction force can be secured as a whole. Furthermore, when the heat insulating adhesive member 50 is manufactured, the adhesive force (adsorption force) of the heat insulating adhesive member 50 can be adjusted by adjusting the amount of the concave shape 51, for example, using the density as a parameter.
Finally, the releasable base sheet 55 is peeled off from the heat insulating adhesive member 50 attached to the bag body 5.
The heat-insulating adhesive member 50 may be attached to the bag body 5 manually by an operator, or may be automatically attached using a dedicated device.

Next, a method for manufacturing the heat insulating adhesive member 50 will be explained.
FIG. 5 is a diagram showing a manufacturing apparatus for the heat insulating adhesive member 50. As shown in FIG.
FIG. 6 is a diagram illustrating a method of manufacturing the heat insulating adhesive member 50.

First, an acrylic emulsion composition disclosed in JP-A No. 2017-36404 for forming the heat insulating adhesive member 50 is placed in a stirrer, and stirring is performed while mixing nitrogen gas into the composition. A bubble-containing composition 150 is prepared by including bubbles therein (P1 in the figure: foaming step).

Next, the bubble-containing composition 150 is applied onto the releasable base sheet 55 (P2 in the figure: coating step). In the coating process, for example, a comma coater can be used, but other known coating methods may also be used.

After coating the bubble-containing composition 150 on the releasable base sheet 55, the bubble-containing composition 150 is dried while being heated to form the heat insulating adhesive member 50 (P3 in the figure: drying step). In the drying step, for example, a drying oven at a temperature of about 60° C. to 140° C. can be used. The drying time can be, for example, about 30 seconds to 10 minutes. Further, in the drying step, drying may be accelerated while blowing air to the bubble-containing composition 150. By performing the drying process, concave shapes 51 are formed on both sides of the bubble-containing composition 150, and the heat insulating adhesive member 50 is formed. This concave shape 51 is formed when the bubbles contained in the bubble-containing composition 150 burst and a portion of the bubble shape remains. Here, if the bubbles break in a state where the bubble-containing composition 150 is insufficiently cured, the concave shape 51 becomes difficult to remain. On the other hand, if the bubble-containing composition 150 hardens before the bubbles burst, the concave shape 51 may not be formed. Therefore, it is desirable that the drying step be carried out under conditions that allow the foam to be broken while the curing of the foam-containing composition 150 has proceeded to some extent. Therefore, the temperature and air flow rate in the drying process greatly affect the state of the concave shape 51.

After forming the heat insulating adhesive member 50 through the drying process, a separately prepared releasable base sheet 56 is bonded to the heat insulating adhesive member 50 (P4 in the figure: lamination process). In this lamination step, since lamination is performed by the adsorption force (adhesive force) of the concave shape 51 of the heat insulating adhesive member 50, heating is not necessary and bonding can be performed with only a slight pressing force.

When the above laminating step is completed, the heat insulating adhesive member 50 whose adhesive surface is covered with the releasable base sheets 55 and 56 is completed.
Note that the heat insulating adhesive member 50 may be formed directly on the outer surface of the container (the surface on the base layer 61 side) of the front film 21 and back film 22 that constitute the bag body 5. . For example, the above-described bubble-containing composition 150 is applied to predetermined areas of the front film 21 and the back film 22 in a pattern according to the external shape of the heat insulating adhesive member 50a and the heat insulating adhesive member 50b, and dried. By curing, the heat insulating adhesive member 50 can be directly formed on the front film 21 and the back film 22. Thereby, the above-mentioned releasable base sheet can be omitted, and costs such as material costs related to the packaging bag 1 can be reduced.

Next, an example in which the heat insulating adhesive member 50 of this embodiment was actually produced will be shown, and the results of comparison with a member of a comparative example will be explained.
In the heat insulating adhesive member 50 of the example, a foam-containing composition 150 that has undergone a foaming process is applied onto a biaxially stretched PET film having releasability as a releasable base sheet 55 using a comma coater having a clearance of 200 μm. did. This was dried in a drying path at 100° C. for 1 minute to form a heat insulating adhesive member 50, and a releasable base sheet 56 similar to the releasable base sheet 55 was laminated thereon. Note that the density of the heat insulating adhesive member 50 in this case was 0.39 g/cm ³ and the thickness was 50 μm.
FIG. 7 is an enlarged photograph of the adhesive surface of the heat insulating adhesive member 50 of the example viewed from the front direction.
FIG. 8 is an enlarged cross-sectional view of the heat insulating adhesive member 50 of the example in a direction perpendicular to the sheet surface.
As shown in FIGS. 7 and 8, it can be confirmed that a large number of concave shapes 51 are formed in the heat insulating adhesive member 50.

As Comparative Example 1, a heat insulating adhesive member was produced in the same manner as in the above example except that the foaming step was not performed. The density of the heat insulating adhesive member after production was 0.87 g/cm ³ and the thickness was 100 μm.
As Comparative Example 2, a heat insulating adhesive member (acrylic adhesive type A) was prepared using acrylic resin SK2094 manufactured by Soken Kagaku Co., Ltd.
As Comparative Example 3, a heat insulating adhesive member (acrylic adhesive type B) was prepared using acrylic resin SK1502C manufactured by Soken Kagaku Co., Ltd.

The above four types of heat insulating adhesive members were prepared and compared in terms of peel strength.
FIG. 9 is a diagram showing the peeling force of Examples and Comparative Examples.
The peel force was measured by peeling off one of the releasable base sheets of the heat insulating adhesive members of the above-mentioned Examples and Comparative Examples, and attaching each heat insulating adhesive member to an adherend. The peeling force in FIG. 9 is the result of performing 180° peeling at a pulling speed of 300 mm/min using a tensile tester and measuring the peeling force at that time. Moreover, the peeling force was measured immediately after pasting (0 hours) and 1000 hours after pasting.

In the examples, it can be seen that peeling can be performed with a relatively small peeling force both immediately after pasting and after 1000 hours have passed. With this level of peeling force, it will not peel off naturally, and it can be easily peeled off if force is applied to try to peel it off. Furthermore, since the adsorption is performed by the concave shape 51, there is no residual heat insulating adhesive member 50 on the surface of the adherend after peeling, and there is no substantial change in the adhesive force (peel force) of the heat insulating adhesive member 50 itself. , could be re-pasted.
In Comparative Example 1, small pieces could be peeled off with a relatively small peeling force, but large pieces required a certain amount of force to peel off. Further, after peeling off, adhesive layer remained on the surface of the adherend, making complete reattachment impossible.
In Comparative Example 2, if the size is large, a certain amount of force is required to peel it off, and it is possible to peel it off immediately after pasting, but after 1000 hours, the peeling force increases significantly. Therefore, it was difficult to remove it manually, and there was a risk that the heat insulating adhesive member would be damaged if it was removed forcibly.
In Comparative Example 3, the peeling force was so great immediately after pasting that it was difficult to peel it off manually, and there was a risk that the heat insulating adhesive member would be damaged if it was forcibly peeled off.
In addition, in both Comparative Example 2 and Comparative Example 3, after peeling, some of the adhesive material remained on the adherend and the adhesive strength decreased, making them unsuitable for reattachment. .

(Verification experiment regarding concave shape 51 of heat insulating adhesive member 50)
As described above, in the present invention, the concave shape 51 of the heat insulating adhesive member 50 has a large effect on the adhesive force. If the concave shapes 51 are not provided evenly on both sides of the heat insulating adhesive member 50, the adhesive force (adsorption force) on one side of the heat insulating adhesive member 50 may decrease or increase compared to the other side. There is. Further, by providing the concave shapes 51 evenly on both sides of the heat insulating adhesive member 50, the physical properties of the heat insulating adhesive member 50 also become homogeneous, and the first releasable base sheet 55 and the second releasable base sheet 56 It is also preferable in terms of sufficient adhesion to both and removability from the adherend. By providing the concave shapes 51 evenly on both sides of the heat insulating adhesive member 50, the entire heat insulating adhesive member 50 can have a uniform heat insulating function. Furthermore, one adhesive surface of the heat insulating adhesive member 50 exerts adhesive force to the adherend (the laminated film constituting the packaging bag 1), and the other adhesive surface provides a sufficient anti-slip function. can demonstrate.

In order to provide the concave shapes 51 evenly on both sides of the heat insulating adhesive member 50, it is important to control the amount of application (thickness t) of the heat insulating adhesive member 50. This point is not considered at all in Japanese Unexamined Patent Publication No. 2017-36404, and it is stated that it is sufficient if micro suction cups are simply formed. In JP-A No. 2017-36404, in FIG. 2 (FIG. 2 of JP-A No. 2017-36404), which is a cross-sectional photograph of Example 1 formed with a WET film thickness of 800 μm, it is shown as a surface having micro suction cups. Although a fine suction cup structure is formed in the part, the part shown as the peeled surface from the glass substrate has a structure that seems to be a huge bubble that is incomparable to the previous fine suction cup structure. Can be confirmed. That is, in the configuration of JP 2017-36404A, micro suction cups (corresponding to the concave shape 51 in this embodiment) are formed on one surface of the adhesive layer, and micro suction cups (corresponding to the concave shape 51 in this embodiment) are formed on the other surface. The concave shape 51) is not substantially formed.

The applicant also conducted a verification experiment on this point.
As a verification experiment, samples of four types of adhesive layers were prepared, and the concave shapes 51 on both sides of the samples were observed using a SEM. The samples are of the following four types.
Sample 1: Thickness of heat insulating adhesive member t = 25 μm
Sample 2: Thickness of heat insulating adhesive member t = 30 μm
Sample 3: Thickness of heat insulating adhesive member t = 35 μm
Sample 4: Thickness of heat insulating adhesive member t≒2000μm
Note that the thickness of the sample above is the thickness after drying. For Samples 1 to 3, the foamed composition was applied to the glass surface using a coater, and then dried using a drying oven at 100 degrees. For sample 4, it was applied dropwise to a glass surface and air-dried at room temperature. Note that the drying conditions for Sample 4 were changed in order to also verify the statement in Japanese Patent Application Laid-Open No. 2017-36404 that drying at room temperature is sufficient. Further, in all samples, the density of the adhesive layer after foaming treatment was 0.4 g/cm ³ .

FIG. 10 is a diagram showing the observation results of Sample 1.
FIG. 11 is a diagram showing the observation results of Sample 2.
FIG. 12 is a diagram showing the observation results of sample 3.
FIG. 13 is a diagram showing the observation results of sample 4.
As shown in FIGS. 10 to 12, it was confirmed that fine concave shapes 51 were evenly formed on both sides of samples 1 to 3 in which the thickness t of the heat insulating adhesive member was controlled.
On the other hand, in the thick sample 4 shown in FIG. 13, there is an extreme difference in the size of the concave shape 51 between the dry surface and the glass side surface, which is similar to FIG. 2 of JP 2017-36404A. The results were obtained.
Therefore, in order to uniformly provide the concave shapes 51 on both sides of the heat insulating adhesive member 50, it can be determined that the thickness t of the heat insulating adhesive member 50 is preferably in the range of 20 μm≦t≦40 μm.

Here, regarding the state in which the concave shapes 51 are evenly provided on both surfaces of the heat insulating adhesive member 50, it is desirable that the following relationship be satisfied in more detail.
The average value of the diameter of each opening of the concave shape 51 that opens on one side of the heat insulating adhesive member 50 (the side on the bag body 5 side) is set as D ^ave ₁ , and the other side (the side opposite to the bag body 5) When the average value of the diameters of the respective openings of the concave shape 51 opening in the surface) is set as D ^ave ₂ ,
|D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ ≦0.5
It is desirable to satisfy the following relationship.
Also,
|D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ ≦0.25
It is further desirable that the following relationship be satisfied.
By satisfying these relationships, it is possible to reduce the difference in adhesive strength on both sides of the heat insulating adhesive member 50, and also to ensure sufficient adhesive strength and strength for the first releasable sheet 55 and the second releasable base sheet 56. Good removability can be achieved. Further, since the concave shapes 51 are evenly provided on both sides of the heat insulating adhesive member 50, the entire heat insulating adhesive member 50 can have a uniform heat insulating function. Further, one adhesive surface of the heat insulating adhesive member 50 exerts adhesive force on the adherend (the laminated film constituting the packaging bag 1), and the other adhesive surface exhibits a slip prevention function. can do.
Note that the average value of the diameter of each aperture refers to the diameter of the aperture with a large diameter within the observation range of 1500 μm x 1100 μm, since it is practically impossible to calculate the average value of all the apertures. The diameters of the three openings were measured in order, and the average value was taken as the average value.

Here, for the samples shown in FIGS. 10 to 13, the apertures were measured and |D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ was determined; sample 1: 0.04, sample 2: 0.06. , sample 3: 0.12, sample 4: 0.69.

The adhesive member of the present invention exhibits a suction cup adhesive function derived from having a large number of concave shapes. For this reason, the adhesive material has a relatively low tackiness due to its material, and its tackiness is lower than that of a normal adhesive material that does not have a concave shape. Even when used in an exposed manner, it is possible to prevent the adhesive surface from becoming sticky and to exhibit sufficient adhesiveness when adhering to the surface to be adhered. Therefore, it can be suitably used in an embodiment where the adhesive surface is exposed as in the present invention.

As described above, the adhesiveness of the heat insulating adhesive member 50 can be adjusted depending on the conditions for forming the opening of the concave shape 51. Then, by changing the formation state of the opening of the concave shape 51 of the heat insulating adhesive member 50, the following two types of heat insulating adhesive members (classified as Type A and Type B) were produced in order to express the adhesive effect. can do.
Type A: Adhesive member whose adhesive force is expressed by suction cup action, and in which the tackiness of the adhesive itself also contributes to the adhesive force. This Type A adhesive member has a slightly "sticky" feel due to the tackiness of the adhesive itself.
Type B: Adhesive member whose adhesive force is developed by suction cup action, but the tackiness of the adhesive itself does not contribute to the tackiness, or the tackiness of the adhesive itself does not develop. In this Type B adhesive member, the tackiness of the adhesive itself does not act as adhesive force, so a "sticky" feel does not occur.

An inclined ball tack test (JIS Z 0237), which is an effective adhesive test for evaluating the above-mentioned "stickiness", was conducted on the above two types of adhesive members. The outline of the inclined ball tack test is as follows.
First, a test piece was prepared by cutting the obtained adhesive member to a width of 25 mm and a length of 100 mm. Next, the test specimen was set in a ball tack tester (manufactured by Tester Sangyo Co., Ltd.) so that the adhesive surface was the front surface (the inclination angle of the adhesive surface was 30°). Further, in an atmosphere of 23° C., a steel ball is rolled so as to pass through the measurement surface area of the adhesive surface of the test piece set in the ball tack tester (the length of the measurement surface is 100 mm). At this time, steel balls having a diameter of 1/32 inch to 1 inch were used. Then, the value of the ball number of the largest diameter among the steel balls that stopped within the area of the measurement surface when these steel balls were rolled was determined. The ball number is determined by multiplying the diameter of the steel ball by 32. Each value in the ball tack test below indicates the value of the ball number.
The results of the inclined ball tack test on the heat insulating adhesive member 50 of this embodiment are shown below.
Type A: 9 (Ball No. 9)
Type B: Since the adhesive itself has no tackiness, all balls No. 1 and above will roll off. In other words, the ball tack evaluation is less than 1.
Since there are various forms of use as an adhesive member, it is not possible to simply assign superiority to Type A and Type B, and it is preferable to select an appropriate one according to the use form. Regarding Type A, considering the convenience of repeeling and reapplying, the ball tack test results are preferably 5 to 10, more preferably 6 to 9, and even more preferably 7 to 8.

In the packaging bag 1 of the above-described embodiment, since the adhesive surface of the heat insulating adhesive member 50 is exposed, a "sticky" feel is not desirable. Therefore, it is desirable to use the above-mentioned Type B as the heat insulating adhesive member 50.

As explained above, since the packaging bag 1 of this embodiment is provided with the heat insulating adhesive member 50 in the accommodating part 2 of the bag main body part 5, the packaging bag 1 can be used when refrigerated or filled with frozen contents. It is possible to significantly prevent the hands (fingers) of the user who handles the packaging bag from becoming numb and being unable to hold the packaging bag or from being unable to easily pour out the contents from the spout.
In addition, the packaging bag 1 of this embodiment has a concave shape 51 on the surface side (opposite the bag main body 5) of the heat insulating adhesive member 50, so that when carrying the packaging bag 1, the hand may slip. This can prevent you from dropping a 1.
Furthermore, since the adhesive force of the heat insulating adhesive member 50 of the packaging bag 1 of this embodiment is based on the adsorption force of the concave shape 51, it has high reworkability, and even if pasting fails, it is easy to re-stick it again. Yes, and easy to use. Further, after the packaging bag 1 is used, the heat insulating adhesive member 50 can be removed from the laminated film 60 without leaving any adhesive residue, making it easier to separate garbage.
In the packaging bag 1 of the present embodiment, the heat insulating adhesive member 50a is provided at a position 2 mm or more away from the sealing portion 4 and the sealing scheduled portion 4a, avoiding an area overlapping with the sealing portion 4 and the sealing scheduled portion 4a. Therefore, it is possible to prevent the heat insulating adhesive member 50 from being provided on the front and back surfaces of the bag body 5 more than necessary, and it is possible to prevent the cost of the packaging bag 1 from increasing. Further, even if the heat insulating adhesive member 50 is formed on the front film 21 and the back film 22 before heat sealing, the heat insulating adhesive member 50 does not overlap with the seal portion 4, so that the upper seal portion 41, the lower seal portion 42 , the side seal portions 43 can be formed uniformly.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes can be made, such as the modified embodiments described below, and these also apply to the present invention. It is within the technical range. Further, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments. In addition, although the embodiment mentioned above and the modification mentioned later can also be used in combination suitably, detailed description is abbreviate|omitted.

(Deformed form)
(1) In the above-described embodiment, the packaging bag 1 is provided with the spout 3 at the top, but the present invention is not limited to this. For example, the packaging bag 1 may have a form in which the spout 3 is omitted. . In this case, in order to open the packaging bag 1, for example, it is necessary to provide a notch such as a cut in the side seal portion 43 so that the upper seal portion 41 can be separated from the bag body portion 5 and opened.

(2) In the above-described embodiment, an example was shown in which the heat insulating adhesive member 50 is provided on the surface of the laminated film 60 (front film 21, back film 22) on the outer side of the container, but the present invention is not limited to this. Instead, it may be provided between the base material layer 61 and the sealant layer 64 of the laminated film 60.

(3) In the above-described embodiment, an example was shown in which the heat insulating adhesive member 50 provided on the bag main body 5 has an exposed adhesive surface on the side opposite to the laminated film 60, but the present invention is not limited to this. It's not something you can do. For example, the heat insulating adhesive member 50 provided on the bag body 5 may have a base material such as a releasable base sheet 55 attached to the adhesive surface on the opposite side from the laminated film 60.

(4) In the above-described embodiment, the example in which one heat-insulating adhesive member 50 is provided on each of the front film 21 and the back film 22 is shown, but the invention is not limited to this, and for example, two or more heat-insulating adhesive members 50 are provided. The heat insulating adhesive member 50 divided into two parts may be provided in an area overlapping with the accommodating part 2.

1 Packaging bag 2 Storage part 3 Spout 4 Seal part 5 Bag body part 21 Surface film (surface part)
22 Back film (back side part)
23 Side film 31 Upper part 32 Lower part 33 Side part 41 Upper seal part 42 Lower seal part 43 Side seal part 50 Heat insulating adhesive member 51 Concave shape 60 Laminated film 61 Base material layer 62 Pattern layer 63 Intermediate layer 64 Sealant layer 65 Bonding layer

Claims (6)

an accommodating section for accommodating contents, the accommodating section having a front surface and a back surface formed of a laminated film including at least a base material layer and a sealant layer, a seal section formed around the accommodating section, and the accommodating section. a bag body portion having a sealing portion provided as necessary around the bag body;
A packaging bag comprising: a heat insulating adhesive member provided on the bag main body,
The heat insulating adhesive member is provided in a region of the front surface portion and the back surface portion that overlaps at least a portion of the storage portion when viewed from above of the bag main body portion,
The heat insulating adhesive member has a plurality of concave shapes on both sides thereof,
The thickness t of the heat insulating adhesive member is in the range of 20 μm≦t≦40 μm,
The concave shape is evenly formed on both sides of the heat insulating adhesive member,
The average value of the diameters of the concave openings that open on the side of the bag body is set as D ^ave ₁ , and the diameter of each of the concave openings that opens on the side opposite to the bag body. When the average value of is D ^ave ₂ ,
|D ^ave ₁ - D ^ave ₂ |/D ^ave ₂ ≦0.5
Packaging bags that meet the relationship. The packaging bag according to claim 1,
In the packaging bag, the heat insulating adhesive member is provided on the front surface portion and the back surface portion so as to be symmetrical in plane when viewed from the side of the bag main body portion. In the packaging bag according to claim 1 or claim 2,
In the packaging bag, the heat insulating adhesive member is provided so as to avoid an area overlapping with the sealing portion and the sealing scheduled portion when the bag main body portion is viewed from above. In the packaging bag according to claim 3,
In the packaging bag, the heat insulating adhesive member is provided at a position 2 mm or more away from the sealing portion and the sealing scheduled portion. In the packaging bag according to any one of claims 1 to 4,
The packaging bag, wherein the heat insulating adhesive member is provided on the front surface portion and the back surface portion. The packaging bag according to any one of claims 1 to 5, wherein the chilled contents are stored in the storage section.

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