JP7471747B2 - Laminated packaging - Google Patents

Description

The present invention relates to a stacked package comprising a lower package and an upper package stacked on top of the lower package.

In the distribution process of goods, packages containing multiple products are shipped from the product's manufacturing plant, etc., and transported to stores via logistics centers, wholesalers, etc. Such packages generally include a cardboard container that contains the products, and multiple packages are sometimes transported or stored in a stacked state. Previously, studies have been conducted on the configuration of the container with the aim of solving various problems that can arise when multiple packages are stacked.

For example, Patent Document 1 describes a cardboard box that includes a square tubular section made of a single sheet of cardboard, a front upper inner flap, a rear upper inner flap, and a pair of upper outer flaps provided on the upper edges of each side wall of the square tubular section, and the square tubular section has an opening break guide section that can be opened to change the box from a packaged state to a display state. According to Patent Document 1, when the opening break guide section is broken to open the cardboard box, the square tubular section can be used as a display stand for products, and multiple opened cardboard boxes can be stacked and displayed.

Patent Document 2 also describes a packaging material that includes an outer case having multiple outer side plates that form a cylindrical portion and an upper plate connected to the outer side plates, and an inner case whose upper end abuts against the upper plate, in which the lower end of the outer side plate is located higher than the lower end of the side plate that forms the inner case, and the dimension between the lower end of the outer side plate and the lower end of the side plate that forms the inner case is smaller than the thickness of the portion where the upper plate abuts against the side plate that forms the inner case. Patent Document 2 describes how, when multiple packaging materials in which products are packed are stacked, it is possible to prevent the side plates that form the packaging material from being deformed by an upper load.

Utility Model Registration No. 3185227 JP 2017-081609 A

In order to prevent the load from collapsing or the contents from deforming, a pallet may be placed between stacked packages during transportation or storage. However, in large stores such as shopping malls, a display format may be adopted in which multiple packages are stacked and displayed in front of the store to sell the products contained in the packages. In this display format, when the number of products contained in the upper package becomes small, the pallet between the packages must be removed, which is time-consuming. On the other hand, if multiple packages are directly stacked without the pallet in order to avoid the time-consuming task of removing the pallet, there is a risk of the load collapsing during transportation, storage, or display.
The technology described in Patent Document 1 does not provide sufficient stability when the packages are stacked, and is not able to address the problem of packages falling apart, particularly when multiple heavy products such as liquid detergents are packed together.
The technology described in Patent Document 2 is intended for packaging in which mechanical products such as hydraulic equipment are stacked in multiple tiers for storage or transportation, and is not intended to accommodate packaging in which multiple products are packed or displayed in a packaged state.

The present invention is concerned with providing a laminated package that can eliminate the drawbacks of the conventional technology described above.

The present invention relates to a stacked package comprising a lower package and an upper package stacked on the lower package, each of which has a storage body with an opening and a bottom and an upper lid covering the opening, a plurality of small packages stored in a stacked manner inside each of the upper package and the lower package, an upper fitting portion that is convex downwardly formed by deformation of the bottom of the upper package, and a lower fitting portion that is convex downwardly formed by deformation of the upper lid of the lower package, the upper fitting portion and the lower fitting portion fitting together, and the lower fitting portion fitting into the storage body of the lower package.

The stacked packaging of the present invention can prevent the upper package stacked on top of the lower package from collapsing, and can simplify the display work of the products contained within the stacked packaging.

FIG. 1 is a perspective view showing one embodiment of the laminated package of the present invention. FIG. 2 is a perspective view of the lower package shown in FIG. FIG. 3 is a perspective view showing the side wall portion shown in FIG. FIG. 4 is a plan view of the upper cover shown in FIG. 2 as viewed from the inner surface side. Figure 5(a) is an oblique view showing the interior of the lower packaging body shown in Figure 2, and Figure 5(b) is a plan view showing the positional relationship between the lower fitting portion shown in Figure 5(a) and the small packaging body inside the upper packaging body. FIG. 6 is a cross-sectional view taken along line II-II in FIG. 1, illustrating the effect of the present invention. FIG. 7(a) is a perspective view showing one embodiment of a small package according to the present invention, and FIG. 7(b) is a cross-sectional view taken along line III-III in FIG. 7(a). 8A to 8C are perspective views showing variations of the locking portions provided on the top cover and the bottom portion. FIG. 9 is a plan view of a side wall forming blank for forming the side wall shown in FIG. FIG. 10 is a plan view of a top cover forming blank for forming the top cover shown in FIG.

The present invention will now be described based on preferred embodiments with reference to the drawings.
First, the package of the present invention will be described.
1 shows a stacked package 1 according to one embodiment of the present invention. The stacked package 1 of this embodiment includes a lower package B and an upper package A stacked on the lower package B. That is, the stacked package 1 is formed by stacking a plurality of packages A and B.
Each of the upper package A and the lower package B contains a plurality of small packages (not shown in FIG. 1 ) each containing a product therein. In other words, each of the packages A and B contains a plurality of smaller packages.

In this embodiment, the upper package A and the lower package B each include a container 10 made of cardboard that contains a plurality of small packages. As described below, the material for forming the container 10 is not limited to cardboard. The container 10 includes an upper lid 11 and a container body 12, and each of the upper lid 11 and the container body 12 is made of cardboard.
The storage body 12 has an opening (not shown in FIG. 1 ) and a bottom 13, and is provided with a cylindrical side wall 15 between the opening and the bottom 13. The storage body 12 has an internal space defined by the side wall 15 and the bottom 13.
The top cover 11 covers the opening of the storage body 12 and closes the opening.
Each of the upper package A and the lower package B has an internal space defined by an upper cover 11 and a storage body 12, and a plurality of small packages can be stored in the internal space.
Hereinafter, the container 10 included in the upper package A will also be referred to as the "upper container 10a," and the container 10 included in the lower package B will also be referred to as the "lower container 10b."

In this embodiment, the upper container 10a has the same configuration as the lower container 10b.
In the following description, the lower housing 10b will be mainly described. Unless otherwise specified, the description of the lower housing 10b can be applied to the upper housing 10a.

Figure 2 shows the lower container 10b included in the lower packaging body B. The lower container 10b of this embodiment has an octagonal prism shape with an octagonal horizontal cross section, and the octagon is long in one direction. The lower container 10b of this embodiment has a longitudinal direction X along the one direction in a plan view and a width direction Y perpendicular to the longitudinal direction X. In other words, the horizontal cross section of the lower container 10b has a maximum length in the longitudinal direction X that is longer than the maximum length in the width direction Y.

FIG. 3 shows a side wall portion 15b of the lower container 10b of this embodiment.
The side wall portion 15b forms most of the internal space of the lower storage unit 10b, which stores a plurality of small packages.
The side wall portion 15b in this embodiment has a cylindrical shape surrounded by a plurality of walls, and its horizontal cross-sectional shape is an octagon that is long in one direction. The side wall portion 15b has four pairs of opposing walls S1, S2, S3, S4 connected in the circumferential direction. More specifically, the side wall portion 15b has a pair of first walls S1, S1 arranged along the longitudinal direction X, a pair of second walls S3, S3 arranged along the width direction Y, and a pair of third walls S2, S2 and a pair of fourth walls S4, S4 located between the first wall portion S1 and the second wall portion S3 in the circumferential direction of the side wall portion 15b, and the third wall portion S2 and the fourth wall portion S4 are located on both sides of the first wall portion S1 in the circumferential direction. The third wall portion S2 and the fourth wall portion S4 have the same configuration.

In this embodiment, the side wall portion 15b has a window portion forming portion 16b in each of the pair of first wall portions S1, S1. The window portion forming portion 16 is a removable portion in the first wall portion S1 on one edge side of the cylindrical structure, and a cutting line 36 such as a perforation is provided along the periphery of the window portion forming portion 16. When the window portion forming portion 16 is cut out along the cutting line 36, a window portion is formed. The window portion makes the inside of the lower storage body 10b visible from the outside, and also serves as a portion for facilitating removal of the small packages 4 from within the package when the stacked package 1 is displayed in a store. When the stacked package 1 is transported or stored, the window portion is not formed in the side wall portion 15b.
The side wall portion 15b of the present embodiment is used with the end edge side where the window portion forming portion 16 is formed in the cylindrical structure facing vertically upward.

As shown in FIG. 2, the lower container 10b has an upper cover 11b disposed in an opening formed by one edge of the cylindrical structure of the side wall portion 15b, and a bottom forming portion 14b disposed in an opening formed by the other edge. The bottom forming portion 14b forms the bottom 13b of the lower container 10b.

FIG. 4 shows an upper cover 11b of the lower container 10b of this embodiment.
In this embodiment, the top cover 11b has a shape in plan view similar to the horizontal cross-sectional shape of the side wall portion 15b, and the longitudinal direction of the top cover 11b coincides with the longitudinal direction X of the lower container 10b.
The upper cover 11b of this embodiment has a top surface portion 17 that is similar in shape to the horizontal cross-sectional shape of the side wall portion 15b, and has a pair of side surface portions S11, S12, S13, S14 that hang down from the periphery of the top surface portion 17 and face each other. More specifically, it has a pair of first side surface portions S11, S11 arranged along the longitudinal direction X, a pair of second side surface portions S13, S13 arranged along the width direction Y, a pair of third side surface portions S12, S12 and a pair of fourth side surface portions S14, S14 located between the first side surface portion S11 and the second side surface portion S13 in the circumferential direction of the top surface portion 17, and the third side surface portion S12 and the fourth side surface portion S14 are located on both sides of the first side surface portion S11 in the circumferential direction. The third side surface portion S12 and the fourth side surface portion S14 have the same configuration.

In the lower storage body 10b of this embodiment, the first side surface portion S11 is disposed along the longitudinal direction X, and the second side surface portion S13 is disposed along the width direction Y. That is, when the upper cover 11b is disposed in the opening of the lower storage body 10b, the first side surface portion S11 and the first wall portion S1 of the side wall portion 15b are disposed adjacent to each other, and the second side surface portion S13 and the second wall portion S3 of the side wall portion 15b are disposed adjacent to each other.
In this embodiment, the upper cover 11b is arranged in the lower storage body 10b with the third side portion S12 and the third wall portion S2 adjacent to each other, and the fourth side portion S14 and the fourth wall portion S4 adjacent to each other.

In the upper package A and the lower package B of this embodiment, a plurality of small packages 4 are stacked and stored inside the containers 10a and 10b having the above-mentioned configuration (see FIG. 5(a)). In the containers 10a and 10b, a stack 4R in which a plurality of small packages 4 are stacked is stored in a state in which a plurality of stacked packages 4 are lined up along the longitudinal direction X or the width direction Y. The stack 4R is a stack of a plurality of small packages 4 stacked together in a plurality of stages along the height direction. The stack 4R of this embodiment is made up of a plurality of small packages 4 stacked in a straight line.
In this embodiment, the lower package B contains a plurality of loads 4R over substantially the entire length of the container 10b in the longitudinal direction X and substantially the entire length of the container 10b in the width direction Y (see FIG. 5(a)). Similarly, the upper package A contains a plurality of loads 4R.
The heights of the loads 4R in the upper package A and the lower package B may be the same or different.
In addition, the number of small packages 4 in a stack 4R may be different for each stack 4R, or may be the same for each stack 4R. That is, the small packages 4 may be stacked so that the heights of the small packages 4 are different for each stack 4R, or the small packages 4 may be stacked so that the heights of the small packages 4 are the same.

FIG. 6 shows a stacked package 1 in which an upper package A is stacked on an upper cover 11b of a lower package B.
In the height direction Z of the stacked packaging body 1, it is preferable that a plurality of small packages 4 are accommodated in at least the lower packaging body B with a space d remaining above the lower container 10b. Such space d is a space in the internal space of the lower packaging body B in a state in which the upper packaging body A is stacked on the lower packaging body B where no small packages 4 are present. In other words, before the formation of a lower fitting portion, which will be described later, the lower packaging body B does not accommodate a plurality of small packages 4 to the full extent of the interior of the lower container 10b in the height direction Z. This makes it easier to form the lower fitting portion, which will be described later.

In the stacked package 1 of this embodiment, even in the upper package A, multiple small packages 4 are stored with space remaining at the top of the upper container 10a. Alternatively, the upper package A may store multiple small packages 4 to fill the entire interior of the upper container 10a in the height direction Z.

In the stacked package 1, an upper fitting portion fa that is a downwardly convex shape formed by deformation of the bottom 13a of the upper package A, and a lower fitting portion fb that is a downwardly convex shape formed by deformation of the top lid 11b of the lower package B are formed. These fitting portions fa and fb are formed when the bottom 13a of the upper package A and the top lid 11b of the lower package B are deformed by the weight of the multiple small packages 4 in the upper package A when the upper package A is stacked on the lower package B.

The upper fitting portion fa and the lower fitting portion fb are fitted together in the stacked packaging body 1. In the upper fitting portion fa and the lower fitting portion fb, the bottom 13a of the upper packaging body A and the upper lid 11b of the lower packaging body B, which face each other, protrude downward at the same position in the planar direction, and the protruding portions are in close contact with each other.
The lower fitting portion fb fits inside the storage body 12b of the lower package B. That is, the downwardly protruding portion of the upper cover 11b of the lower package B is pressed into the inside of the storage body 12b.

In the stacked packaging body 1 of this embodiment, the upper fitting portion fa and the lower fitting portion fb are fitted together, and the lower fitting portion fb is inserted into the storage body 12b of the lower packaging body B, thereby fixing the upper packaging body A and the lower packaging body B. This suppresses horizontal movement of the upper packaging body A stacked on the lower packaging body B. Therefore, the stacked packaging body 1 of this embodiment can effectively suppress collapse of the upper packaging body A falling from the lower packaging body B without interposing a pallet between the upper packaging body A and the lower packaging body B. For example, the stacked state of the upper packaging body A can be stably maintained not only during transportation and storage of the stacked packaging body 1, but also when the stacked packaging body 1 is placed in a storefront to display the products in the small packaging body 4.
The upper fitting portion fa and the lower fitting portion fb, which serve as the cargo collapse prevention means, can be easily formed by deforming the bottom 13a of the upper container 10a and the upper lid 11b of the lower container 10b, respectively, so there is no need to provide the stacked packaging body 1 with a cargo collapse prevention means made of a separate member, which contributes to saving packaging materials and improving the work efficiency of producing the stacked packaging body 1.
In addition, since no pallet is disposed between the upper package A and the lower package B, the stacked package 1 is not excessively tall and is compact, which is advantageous in that it facilitates loading onto vehicles such as trucks and displaying in stores. In addition, since there is no need to remove the pallet, the display work of the products can be simplified.

In order to further prevent cargo from falling over, the insertion depth D1 (see Figure 6) of the lower fitting portion fb into the lower storage body 12b is preferably 5% or more, more preferably 10% or more, and preferably 25% or less, more preferably 20% or less, relative to the height H (see Figure 3) of the side wall portion 15b in the lower storage body 10b, and is preferably 5% or more and 25% or less, and more preferably 10% or more and 20% or less.
From the same viewpoint as above, the insertion depth D1 (see Figure 6) of the lower fitting portion fb into the lower storage body 12b is preferably 30 mm or more, more preferably 50 mm or more, and also preferably 200 mm or less, more preferably 100 mm or less, and also preferably 30 mm or more and 200 mm or less, more preferably 50 mm or more and 200 mm or less.
The insertion depth D1 of the lower fitting portion fb into the lower housing main body 12b is the height in the height direction Z from the highest point to the lowest point on the inner surface of the upper cover 11b of the lower housing 10b.
6, the insertion depth D1 is the height from the upper end of the opening in the side wall portion 15b of the lower storage body 10b to the small package 4 in contact with the lower fitting portion fb. In other words, in this embodiment, the insertion depth D1 is the maximum height of the space d existing in the upper portion of the lower storage body 10b.

From the standpoint of more easily forming the upper fitting portion fa and the lower fitting portion fb, the thickness of the bottom 13a in the upper packaging body A and the thickness of the top portion 17 of the upper cover 11a in the lower packaging body B are each preferably 0.9 mm or more, more preferably 5 mm or more, and preferably 15 mm or less, more preferably 10 mm or less, and preferably 0.9 mm or more and 15 mm or less, more preferably 5 mm or more and 10 mm or less.
In this embodiment, this thickness is the thickness of the top cover forming blank 20 or the bottom forming blank, which will be described later.
When the storage body 12a in the upper packaging body A is formed from a single member including a portion forming the side wall portion 15a and a portion forming the bottom portion 13a, the thickness of the bottom portion 13a means the thickness of the single member.

From the viewpoint of improving the efficiency of the transport operation and further preventing the collapse of cargo, it is preferable that the dimensions of the side wall portion 15b of the lower storage body 10b be within the following range.
The inner dimension L1 (see FIG. 3) of the side wall portion 15b in the longitudinal direction X is preferably 400 mm or more, more preferably 500 mm or more, and is preferably 1500 mm or less, more preferably 1000 mm or less, and is preferably 400 mm or more and 1500 mm or less, more preferably 500 mm or more and 1000 mm or less. The inner dimension L1 of the side wall portion 15b in the longitudinal direction X is the length between the inner surfaces of the wall portions S3, S3 arranged opposite each other in the longitudinal direction X in a plan view of the side wall portion 15b.
The inner dimension L3 of the side wall 15b in the width direction Y (see FIG. 3) is preferably 300 mm or more, more preferably 450 mm or more, and is preferably 900 mm or less, more preferably 750 mm or less, and is preferably 300 mm or more and 900 mm or less, more preferably 450 mm or more and 750 mm or less. The inner dimension L3 of the side wall 15b in the width direction Y is the length between the inner surfaces of the wall portions S1, S1 arranged opposite each other in the width direction Y in a plan view of the side wall 15b.
The height H of the side wall portion 15b (see FIG. 3) is preferably 300 mm or more, more preferably 400 mm or more, and is preferably 1000 mm or less, more preferably 700 mm or less, and is preferably 300 mm or more and 1000 mm or less, more preferably 400 mm or more and 700 mm or less.

It is preferable that the lower fitting portion fb is adapted to at least temporarily come into contact with some of the small packages 4 arranged in the storage body 12b. That is, the lower fitting portion fb temporarily comes into contact with the small package 4 arranged at the top of the stack 4R. This causes the bottom 13a of the upper package A and the top lid 11b of the lower package B to be sandwiched between the stack 4R of the upper storage body 10a and the stack 4R of the lower storage body 10b, thereby making it possible to more firmly fix the upper package A and the lower package B together.
In the present embodiment, when multiple stacked bodies 4R are stored in the lower storage body 10b, the lower fitting portion fb only needs to be in temporary contact with the small package 4 that is arranged at the top of at least one of the stacked bodies 4R.
The "temporary" state may be, for example, a state before the upper package A and the lower package B are opened during transportation or storage of the stacked package 1.

As shown in FIG. 6, in the stacked packaging body 1 of this embodiment, a plurality of stacked bodies 4R are accommodated in the lower storage body 10b, and of these stacked bodies 4R, the two stacked bodies 4R arranged in the center in the longitudinal direction have the uppermost small packaging body 4 in contact with the lower fitting portion fb.
From the viewpoint of further improving the effect of suppressing collapse of the load, it is preferable that the plurality of small packages 4 in the lower package B are stacked so as to function as a support that prevents further deformation of the lower fitting portion B when the small packages 4 come into contact with the lower fitting portion fb. In this embodiment, the support is a load 4R having at its uppermost position the small package 4 that comes into contact with the lower fitting portion B. By supporting the lower fitting portion fb by this support, i.e., by suppressing excessive downward deformation of the upper cover 11b of the lower package B, it is possible to further suppress the lower storage unit 10b from deforming more than necessary and the side wall portion 15b of the lower storage unit 10b from buckling.

With regard to the load body 4R having small packaging items 4 in contact with the lower fitting portion B, in order to further improve its function as a support body and to further prevent damage to goods due to the weight of the upper packaging item A, it is preferable that the small packaging items 4 in the lower packaging item B have load-bearing characteristics.
An example of the small package 4 having the above-mentioned configuration is one having a packaging box formed by assembling plate materials as a container. As the plate material of such a packaging box, it is preferable to use cardboard made of paper, but cardboard such as coated cardboard, chipboard, and kraft cardboard may also be used, and cardboard made of plastic (synthetic resin) may also be used.

Figures 7(a) and (b) show an example of a small package 4 equipped with packaging materials that have strength against load. The small package 4 shown in Figures 7(a) and (b) is equipped with a packaging bag 40 formed from a sheet material containing synthetic resin as packaging material for containing (packaging) a product. Such a small package 4 is a product package in which the product 5 is contained in the packaging bag 40, and includes the product 5 and the packaging bag 40 as components.

In the small package 4 of this embodiment, a plurality of products 5 are accommodated in the internal space 43 of the packaging bag 40, and gas is sealed in the internal space 43. This configuration effectively protects the products accommodated in the internal space 43 of the packaging bag 3. More specifically, when a load such as a weight is applied to the small package 4, the air in the internal space 43 functions as a cushioning material.
In this specification, being filled with gas (air) means that the gap 44 between the packaging bag 40 and the product 5 is filled with gas, and the packaging bag 40 is airtightly sealed so that the gas does not leak out to the outside. Therefore, it is not necessary to perform an operation to increase the internal pressure, such as sending a gas such as air into the packaging bag before sealing the inside of the packaging bag 40 of this embodiment, or joining the inner surfaces of the packaging bag together to increase the internal pressure after sealing. Note that the gas is preferably air, but it may be air, a mixed gas in which nitrogen and oxygen are mixed in a ratio different from that of normal air, nitrogen, helium, etc.

From the viewpoint of further improving the cushioning function of the air in the internal space 43, and from the viewpoint of easily stacking multiple small packages 4 when transporting or storing them, the porosity G of the small package 4 is preferably 30% or more under standard conditions (20°C, 1 atmosphere), more preferably 30% to 80%, even more preferably 32% to 70%, and even more preferably 32% to 60%.

By setting the void ratio G within the above range, when the small packages 4 are stacked, they can be in contact with each other on a large flat surface, making it possible to stack the small packages 4 in a stable state. The void ratio G prevents the overlapping surfaces of the small packages from becoming significantly tilted or uneven due to the products inside, further improving the stability of the stacked state.

The void ratio G is a value expressed as a percentage of the volume V3 of the gap 44 between the packaging bag 40 and the product 5 to the volume V1 of the small package 4, and is measured under standard conditions, i.e., a temperature of 20°C and an atmospheric pressure of 1 atmosphere (1 atm = 101.325 kPa).
The volume V1 of the small package 4 and the volume V3 of the gap 44 can be measured by any method capable of measuring both volumes, but are preferably measured by the following simplified measurement method.

[Simplified measurement method]
The small package to be measured is left to stand in a closed space such as a room maintained under standard conditions for a sufficient time until the volume stabilizes, and then the small package to be measured is submerged in a cylindrical water tank (water temperature 20°C) with an inside bottom dimension of 330 mm in diameter and 500 mm in depth installed in the room until the entire package is below the water surface. The difference (mm) between the water depth before and after submersion is multiplied by the bottom area of the water tank to determine the volume V1 of the small package 4. The size of the water tank is not limited to the above dimensions as long as it is larger than the small package 4, but it is preferable that the size is several times larger than the small package.
In addition, the product volume V2 is measured in the same manner as the small package volume measurement method, except that the product removed from the small package is submerged in the water in the tank instead of the small package. If the small package contains multiple products, the total volume of all the products is regarded as the product volume V2.
The value obtained by subtracting the measured volume V2 of the product from the measured volume V1 of the small package is the volume V3 of the gap 44. If the product has holes or spaces into which water can enter, the volume V2 of the product is obtained by measuring the product after preventing water from entering using sealing tape or a water-resistant adhesive, or by calculating the volume of the product including the volume of the holes or spaces from the outer shape of the product.
Then, the void ratio G (%) is calculated from the volume V3 of the gap 44 and the volume V1 of the small package 4 by the following formula (1).
Porosity G (%) = (volume V3 of void 44 / volume V1 of small package 4) x 100 (1)

From the standpoint of further improving the stability of the stacked state of the small packages 4 in the load 4R, it is preferable that the expansion rate H, which is the percentage value representing the ratio of the volume V1 of the package in the standard state to the volume V4 of the package bag when the internal pressure of the package bag is increased to 1.1 atmospheres, is 60% or more and 90% or less.
By setting the thickness to 60% or more, it is possible to prevent a large load from being directly applied to the product in the package when the packages are stacked, and the package can function sufficiently as a buffer container. By setting the thickness to 90% or less, the volume of the packaging bag changes to a certain extent when the packages are stacked, which further improves the stability when stacked.
From this viewpoint, the swelling rate H (%) is preferably 65% or more, more preferably 69% or more, and is preferably 90% or less, more preferably 88% or less, and is preferably 65% or more and 90% or less, even more preferably 69% or more and 90% or less, and even more preferably 69% or more and 88% or less.

The volume V4 of the package when the internal pressure of the gap 44 is increased to 1.1 atmospheres is measured by attaching an internal pressure gauge and an air injection tube to an empty packaging bag without a product inside, injecting air through the air injection tube until the internal pressure reaches 1.1 atmospheres, and then sealing the bag. The empty packaging bag with an internal pressure of 1.1 atmospheres is submerged in a water tank until the bag is completely submerged, and the volume of water discharged is measured.
When submerging a small package or an empty packaging bag in water, water pressure is avoided as much as possible on the small package or the empty packaging bag. The reason for avoiding water pressure is to prevent the volume of the small package or the empty packaging bag from decreasing due to water pressure. The preferred form for submerging in water is horizontal placement so that the surface with the largest area, for example, the outer surface of the sheet material forming the internal space of the small package shown in Figures 7(a) and (b), is parallel to the water surface.
Then, the swelling rate H (%) is calculated by the following formula.
The swelling rate H (%)=(volume V1 of small package 4/volume V4 of empty packaging bag with internal pressure of 1.1 atmospheres)×100 (2)

The air sealed in the internal space 43 of the packaging bag 40 may be sealed at a pressure equal to or higher than atmospheric pressure. The pressure inside the packaging bag 40 can be measured directly by connecting a pressure gauge to the packaging bag. The pressure gauge used is an OMRON/E8F2-A01C (MAX 100 kPa), and the pressure can be measured by attaching the screw part at the tip of the pressure gauge to a connection port prepared in advance on the packaging bag. When in an individual package (with a product inside), the internal pressure of the packaging bag is 0 to 0.5 kPa.

The packaging bag 40 of this embodiment is made of a synthetic resin sheet material. As such a synthetic resin sheet material, a single-layer or multi-layer resin film can be used. As the multi-layer resin film, a multi-layer sheet material having a base film layer and a sealant layer that imparts heat sealability is preferable. It is also preferable to have a gas barrier layer between the base film layer and the sealant layer. The gas barrier layer may be used as the outermost layer on the base film layer. Lamination of each of these layers can be performed by a conventional lamination method, such as dry lamination using an adhesive, or thermal lamination in which a thermally adhesive layer is sandwiched and bonded by heat.

Examples of films constituting the base film layer include one or more layers of stretched or unstretched films made of polyester (polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), etc.), polyolefin (polyethylene (PE), polypropylene (PP), etc.), polyamide (nylon-6, nylon-66, etc.), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), polymethyl methacrylate (PMMA), and polyethersulfone (PES), etc.

When using a single-layer resin film as the synthetic resin sheet material, the resin can be selected from the resins that make up the base film layer described above.

The sheet material constituting the packaging bag 40 is preferably such that the outermost layer forming the outer surface of the packaging bag is a single-layer or multi-layer resin film made of any one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), polyolefins (polyethylene (PE), polypropylene (PP), etc.), polyamide (PA), polyacrylonitrile (PAN), polyimide (PI), polyvinyl chloride (PVC), and polyvinylidene chloride (PVDC), from the viewpoint of facilitating attachment of information materials such as labels with an adhesive such as a hot melt adhesive.

Examples of films that make up the sealant layer include single-layer or two-layer or more stretched or unstretched films made of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), ethylene-propylene copolymer (EP), unstretched polypropylene (CPP), ethylene-olefin copolymer, ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ethylene-vinyl acetate copolymer (EVA).

Examples of gas barrier layers include thin metal films such as aluminum, or resin films such as polyvinylidene chloride (PVDC) or ethylene-vinyl alcohol copolymer (EVOH), or films in which aluminum, aluminum oxide, silica or other inorganic oxides are vapor-deposited (or sputtered) onto any synthetic resin film (which may be, for example, a base film layer). By providing a gas barrier layer, it is possible to prevent odor transfer that cannot be prevented by the product alone, and to improve light-blocking and airtightness.

The combination of layers that make up the packaging bag 40 can be, for example, a combination of one or more layers of polyester for the base film layer, polyethylene for the sealant layer, and a thin metal film such as aluminum for the gas barrier layer. Since gas barrier properties are often provided by the product container, if gas permeability is not an issue, a resin such as an ethylene-vinyl alcohol copolymer can be used instead of the thin metal film.

The packaging bag 40 may be made of a single sheet. That is, the packaging bag 40 may have a single-layer structure. Such a packaging bag 40 is preferable in that it is made of a single type of material and can be easily used as a recycled resource.

As shown in FIG. 7(b), the packaging bag 40 of this embodiment is configured to include an outer layer sheet 41 that forms the outer surface of the packaging bag, and an inner layer sheet 42 that forms the inner surface of the packaging bag. That is, the packaging bag 40 has a laminated structure in which a plurality of layers consisting of the outer layer sheet 41 and the inner layer sheet 42 are laminated. In this case, the strength of the packaging bag can be further improved. The packaging bag 40 having a two-layer structure can be formed by folding the laminate of the outer layer sheet 41 and the inner layer sheet 42 in half or stacking two sheets and sealing the three or four sides around it. Alternatively, the laminate of the outer layer sheet 41 and the inner layer sheet 42 can be formed into a cylindrical shape and sealed at both ends of the laminate by heat sealing or the like to form a pillow bag. The packaging bag 40 of this embodiment has a sealed portion 45 in which the four sides of the laminate are sealed in a plan view, and an internal space 43 in the area surrounded by the sealed portion 45. From the same viewpoint as above, it is preferable that the outer layer sheet 41 and the inner layer sheet 42 are not joined in the area forming the internal space 43 of the packaging bag 40.

In the embodiment shown in Figures 7(a) and (b), the product 5 includes a standing pouch containing a liquid inside. Such a product is a product that is usually sold in a container, such as shampoo or detergent, and the container is also included in the product.

The number of products 5 contained in the small package 4 may be one or more.
The product 5 contained in the small package 4 is not particularly limited, and examples include dishwashing detergent, laundry detergent, fabric softener, processed foods, disposable diapers, sanitary products, hair care products such as shampoo, cosmetics, processed foods, beverages, seasonings, confectioneries, toys, books, CDs and DVDs with music or videos recorded on them, tools, car accessories, electronic information terminals such as smartphones, electronic components, electrical appliances, etc.
When multiple products 5 are contained in the small package 4, the multiple products may be the same product or a combination of different products.

If the upper fitting portion fa and the lower fitting portion fb are easily formed in the stacked packaging body 1, the effect of preventing the load from collapsing can be further improved. From this perspective, it is preferable that the upper cover 11b of the lower packaging body B is configured so that the downward protrusion of the upper fitting portion fa causes the upper cover 11b of the lower packaging body B to protrude downward, i.e., to promote the deformation of the upper cover 11b. For example, as in this embodiment, it is preferable that a guide line is formed on the upper cover 11b of the lower packaging body B to guide the formation of the lower fitting portion fb. This allows the upper cover 11b to be deformed regularly, and the effect of the fitting can be further improved. Such a guide line is also referred to as a "lower fitting guide line" below.

A lower fitting guide line is formed on the top surface 17 of the top cover 11b of the lower housing 10b of this embodiment. As shown in Fig. 4, the lower fitting guide line of this embodiment is composed of a central guide line C5 that forms a rectangle in a plan view at approximately the center of the top surface 17, and side guide lines C7 that extend radially from each vertex of the rectangle and reach the boundary between the side surface portions S11, S14 of the top cover 11b and the top surface 17. The side guide lines C7 of this embodiment are line segments between the corners of the central guide line C5 and both ends of the first side surface portion S11 in a plan view.
When the upper package A is stacked on the upper cover 11b having such a lower fitting guide line and the bottom of the upper package A is deformed to form the upper fitting portion fa, the portion defined by the side guide line C7 and the center guide line C5 on the top surface 17 of the upper cover 11b, i.e., the outer periphery of the center guide line C5, tends to deform so as to incline downward, and the formation of the lower fitting portion fb can be induced with the area surrounded by the center guide line C5 as its bottom portion. In other words, the lower fitting portion fb can be easily formed along the lower fitting guide line.
The lower fitting guide line can be formed by subjecting the top surface portion 17 to a folding process such as creasing, a cut process that does not penetrate the top surface portion 17 (half cut process), a perforation process, or the like.

In this embodiment, the lower fitting portion fb has a flat bottom. Since the portion of the top surface 17 defined by the center guide line C5 is flat, the bottom may remain flat or may be deformed into a curved shape depending on the weight of the small packages 4 in the upper package A.
Alternatively, the bottom of the lower fitting portion fb may be a point or a line. From the viewpoint of dispersing the load due to the weight of the upper packaging body A, it is preferable that the bottom of the lower fitting portion fb is formed in a flat shape.
From the standpoint of further distributing the load, the area of the bottom of the lower fitting portion fb is preferably 25% or more, more preferably 35% or more, and also preferably 75% or less, more preferably 65% or less, relative to the area of the top surface portion 17 of the upper lid 11b of the lower storage body 10b, and also preferably 25% or more and 75% or less, more preferably 35% or more and 65% or less.
In this embodiment, the bottom of the lower fitting portion fb has a quadrangular shape in a plan view, but is not limited to such a shape and may have any shape in a plan view, such as a hexagon or octagon.

In this embodiment, the bottom of the lower fitting portion fb can be formed by a lower fitting guide line, more specifically, by a center guide line C5. In order to further prevent the load from shifting, it is preferable that the dimensions of the bottom of the lower fitting portion fb are within the following range. Such dimensions can be adjusted by the dimensions of the center guide line C5.
The length L13 (see FIG. 4) of the bottom of the lower fitting portion fb in the longitudinal direction X is preferably 30% or more, more preferably 50% or more, and preferably 90% or less, more preferably 70% or less, and preferably 30% or more and 90% or less, more preferably 50% or more and 70% or less, of the maximum length L10 (see FIG. 4) of the upper cover 11b along the longitudinal direction X.
The length L14 (see Figure 4) of the bottom of the lower fitting portion fb in the width direction Y is preferably 40% or more, more preferably 60% or more, and preferably 90% or less, more preferably 80% or less, of the maximum length L12 (see Figure 4) of the upper cover 11b along the width direction Y, and is preferably 40% or more and 90% or less, more preferably 60% or more and 80% or less.

From the viewpoint of dispersing the load due to the weight of the upper package A, it is preferable that the area formed by the center guide line C5, i.e., the area of the bottom of the lower fitting portion fb, in a plan view, is an area equivalent to the area of a plurality of small packages 4. For example, as shown in Fig. 5(b) , it is preferable that the area of the bottom b of the lower fitting portion fb in a plan view is an area that includes a plurality of small packages 4 contained in the upper package A.
From the same viewpoint as above, it is preferable that the dimension of the bottom b of the lower fitting portion fb be within the following range.
The area of the bottom b of the lower fitting portion fb is preferably 25% or more, more preferably 40% or more, and also preferably 75% or less, more preferably 60% or less, and also preferably 25% to 75%, more preferably 40% to 60% of the contact area between the inner surface of the bottom of the upper packaging body A and the small packaging bodies 4. The contact area is the total area in a plan view of the multiple small packaging bodies 4 arranged in contact with the inner surface of the bottom of the upper packaging body A.
The length L1b (see FIG. 5(b)) in the longitudinal direction X of the bottom b of the lower fitting portion fb is preferably 30% or more, more preferably 50% or more, and preferably 90% or less, more preferably 70% or less, of the total length L4 (see FIG. 5(b)) in the longitudinal direction X of the small packaging bodies 4 that are in contact with the inner surface of the bottom of the upper packaging body A.
The length L3b in the width direction Y of the bottom b of the lower fitting portion fb [see Figure 5 (b)] is preferably 40% or more, more preferably 60% or more, and preferably 90% or less, more preferably 80% or less, of the total length L5 [see Figure 5 (b)] in the width direction Y of the small packaging bodies 4 that are in contact with the inner surface of the bottom of the upper packaging body A, and is preferably 40% or more, more preferably 60% or more, and more preferably 80% or less.

If the upper fitting portion fa and the lower fitting portion fb are easily formed in the stacked package 1, the effect of preventing the load from collapsing can be further improved. From this viewpoint, it is preferable that the weight of the small packages 4 contained in the upper package A causes the bottom 13a of the upper package A to protrude downward, i.e., that the deformation of the bottom 13a is promoted. For example, as in this embodiment, it is preferable that a guide line is formed on the bottom 13a of the upper package A to guide the formation of the upper fitting portion fa. Such a guide line is hereinafter also referred to as an "upper fitting guide line."
The upper fitting guide wire preferably has the same configuration as the lower fitting guide wire described above. In that case, the "lower fitting portion" should be read as the "upper fitting portion," the "lower fitting guide wire" as the "upper fitting guide wire," and the "upper cover 11b of the lower packaging body B" or the "top surface 17 of the upper cover 11b of the lower packaging body B" as the "bottom 13a of the upper packaging body A," and the configuration of the lower fitting guide wire can be appropriately applied to the upper fitting guide wire.

To further prevent the collapse of the package, it is preferable that the upper cover 11b of the lower package B and the bottom 13a of the upper package A are each provided with a locking portion 6 having a base end 61 and a free end 62. By locking the locking portions 6 of the upper cover 11b and the bottom 13a to each other, horizontal displacement of the upper package A in the stacked package 1 can be further prevented.

8(a) to 8(c) are each made of a rectangular locking piece 60 formed by making cuts on three sides on the top cover 11b of the lower packaging body B and the bottom 13a of the upper packaging body A. The locking piece 60 is continuous with the bottom 13a or the top cover 11b at a base end 61. After stacking the bottom 13a of the upper packaging body A on the top cover 11b of the lower packaging body B so that the locking piece 60 on the bottom 13a of the upper packaging body A overlaps with the locking piece 60 on the top cover 11b of the lower packaging body B, the locking piece 60 of the bottom 13a is pushed in from above together with the locking piece 60 of the top cover 11b, whereby the locking pieces 60 of the bottom 13a and the locking pieces 60 of the top cover 11b are bent downward with the base end 61 as a flexible axis and locked to each other.
The operation of forming such an engagement portion is performed with the bottom 13a of the storage body 12a of the upper packaging body A placed on the top lid 11b of the lower packaging body B. In this case, the storage body 12a of the upper packaging body A may be empty, or may contain small packages 4. The formation operation may also be performed with the top lid 11 and the bottom 13 of the storage body 12 overlapped, and the top lid 11 and storage body 12, which are engaged with each other, may be overlapped on another storage body containing small packages 4.

The locking portion 6 a shown in FIG. 8( a ) is composed of one locking piece 60 .
The locking portion 6b shown in Fig. 8(b) is composed of two locking pieces 60, and the notches forming the locking pieces 60 before being locked are H-shaped in a plan view. The locking portions of the locking portion 6b are pushed downward like double doors (see Fig. 8(b)).
8(c) is made up of four locking pieces 60, and the notches forming these locking pieces 60 before being locked are swastika-shaped in a plan view. The locking portion 6c is pushed downward so that the four locking pieces 60 come together to form a square shape.
The locking portion is not limited to the shapes shown in Figures 8(a) to 8(c) and may have other shapes. For example, the locking portion may be one locking piece 60 shown in Figure 8(a) provided at multiple locations.

From the viewpoint of preventing interference between the locking piece 60 pushed downward and the small package 4 in the lower package B, it is preferable that the locking portion is formed in a portion other than the bottom of the upper fitting portion fa and the bottom of the lower fitting portion fb. For example, it is preferable that the locking portion is formed on the outer periphery of the central guide line 5C formed in the upper cover 11b of the lower container 10b. In other words, it is preferable that the locking portion is located outside the central guide line 5C in both the longitudinal direction X and the width direction Y.

Next, the components forming the containers 10a, 10b of the upper container A and the lower container B will be described in detail. In this embodiment, the components forming the upper container 10a have the same configuration as the components forming the lower container 10b. Unless otherwise specified, the description of the components forming the lower container 10b can be applied to the components forming the upper container 10a.

The lower container 10b is made of a plastically deformable plate material. The plate material may be the same as the material used for the packaging box that may be included in the small package 4. From the viewpoint of manufacturing costs, the material for the lower container 10b is preferably cardboard.
Furthermore, the upper packaging body A and the lower packaging body B may be made of different materials for each separable member, i.e., each part. In this case, as long as the effects of the present invention are achieved, it is sufficient that at least the bottom 13a of the upper container 10a and the top cover 11b of the lower container 10b are made of a plastically deformable plate material.

The lower storage unit 10b may be configured such that the storage body 12b is formed from a single member including a portion forming the side wall portion 15b and a portion forming the bottom portion 13b. In other words, the storage body 12b is made of a single member in which the side wall portion 15b and the bottom portion 13b are continuous. In this case, the storage body 12b is made of one part, and the lower storage unit 10b including the storage body 12b is made of two parts, the upper lid 11b and the storage body 12b.

When the lower storage body 10b is composed of two parts, for example, the lower storage body 12b including the side wall portion 15b and the bottom portion 13b is formed using a single blank (not shown). To describe an example of such a single blank in detail, the blank has a portion that becomes each side portion that forms the side wall portion 15b (hereinafter also referred to as the "wall portion forming portion") and a portion that becomes the bottom portion 13b (hereinafter also referred to as the "bottom portion forming portion") defined by a fold line, a cut, etc. The fold line, the cut, etc. can be formed by a crease processing such as a creasing processing, a cut processing, etc. The blank has a shape that is long in one direction, and its longitudinal direction corresponds to the circumferential direction of the side wall portion 15b, and the orthogonal direction perpendicular to the longitudinal direction corresponds to the height direction of the side wall portion 15b. In the blank, a plurality of wall portion forming portions are connected along the longitudinal direction, and the bottom portion forming portion is connected to each wall portion forming portion in the orthogonal direction. That is, the number of wall portion forming portions and the number of bottom portion forming portions of the blank are the same.
The lower container 10b can be assembled by folding the blank along fold lines, cuts, etc. First, the blank is folded into a tubular shape consisting of a plurality of wall forming portions to form the side wall portion 15b. Next, the blank is folded so that the wall forming portions stand from the bottom forming portion and so that the plurality of bottom forming portions partially overlap each other to form the bottom portion 13b. In this manner, the lower container 10b is assembled.

In the lower storage body 10b of this embodiment, the storage body 12b is formed from a member forming the side wall portion 15b and a member 14b forming the bottom portion 13b (see FIG. 2). Such storage body 12b is composed of two parts, which are the members forming the side wall portion 15b and the bottom portion 13b. Therefore, the lower storage body 10b of this embodiment is composed of three parts, which are the members forming the upper cover 11, the side wall portion 15b, and the bottom portion 13. The member forming the bottom portion 13 is also referred to as the "bottom forming part 14."
In the present embodiment, the side wall portion 15b and the bottom portion 13b of the container body 12b are formed of separate members. Specifically, the lower container 10b is formed from a set of a side wall portion forming blank 30, a top cover forming blank 20, and a bottom portion forming blank. Each blank will be described later.

In this embodiment, the fixing means is a known fixing means such as an adhesive, double-sided tape, or a stapler.
The side wall portion 15b and the bottom portion 13b are fixed. When using a stapler for fixing, flat fastening or corner fastening may be used. Flat fastening is a form in which a portion where one piece of the side surface portion forming the side wall portion 15b and one piece of the outer peripheral portion arranged adjacent to the side surface portion in the thickness direction of the member forming the bottom portion 13b overlap is fixed with a staple (needle member). Corner fastening is a form in which, at the corners of each of the side wall portion 15b and the bottom portion 13b, two pieces of side surface portions adjacent to each other in the circumferential direction and two pieces of outer peripheral portions arranged adjacent to each other in the thickness direction are fixed with a staple straddling the staple.
As long as the positions of the side wall portion 15b and the bottom portion 13b are stable due to the weight of the multiple small packages contained inside the container 10b, the side wall portion 15b and the bottom portion 13b do not need to be fixed to each other.

The side wall portion 15b in this embodiment is formed using a single side wall portion forming blank 30 as shown in FIG. 9. The side wall portion forming blank 30 can be easily obtained, for example, by punching and cutting a single piece of cardboard so that the side wall portion 15b is in the desired unfolded shape.

The blank 30 for forming the side wall has fold lines, cuts, etc. at appropriate locations by applying creasing processing such as creasing and cut processing. As a result, the blank 30 for forming the side wall can be used to easily assemble the side wall 15b having a three-dimensional shape as shown in Figure 3.

As shown in FIG. 9, the blank 30 for forming the side wall portion of this embodiment has a rectangular shape that is long in one direction, and has wall forming portions 31, 32, 33, and 34 connected along the longitudinal direction _X1 , and a fold line c1 formed at the boundary between these wall forming portions. More specifically, along the longitudinal direction _X1 of the blank 30 for forming the side wall portion, the first wall forming portion 31 for forming the first wall portion S1, the third wall forming portion 32 for forming the third wall portion S2, the second wall forming portion 33 for forming the second wall portion S3, and the fourth wall forming portion 34 for forming the fourth wall portion S4 are arranged in this order twice, and the fold line c1 is interposed between the adjacent wall forming portions. The longitudinal direction _X1 of the blank 30 for forming the side wall portion corresponds to the circumferential direction of the side wall portion 15b. The fold line c1 extends so as to be perpendicular to the longitudinal direction _X1 of the blank 30 for forming the side wall portion. A first wall forming portion 31 is disposed at one end of the blank 30 in the longitudinal direction _X1 , and a joint portion ₃₇ is disposed on the outer side of the blank 20 in the longitudinal direction X1 from the first wall forming portion 31. A fourth wall forming portion 34 is disposed at the other end of the blank 30 in the longitudinal direction _X1 , and the fourth wall forming portion 34 forms the other end. That is, the joint portion 37 forms one end of the blank 30 in the longitudinal direction _X1 , and the fourth wall forming portion 34 forms the other end in the longitudinal direction _X1 . A cutting line 36 that defines the window forming portion 16 is formed in the first wall forming portion 31. The cutting line 36 is formed by performing a perforation process or the like along the periphery of the window forming portion 16.

The side wall 15b can be formed by folding the side wall forming blank 30 into a cylindrical shape along the folding line c1 and fixing the joint portion 37 to the fourth wall forming portion 34 located at the other end in the longitudinal direction _X1 of the side wall forming blank 30. The joint portion 37 can be fixed by known fixing means such as an adhesive, double-sided tape, a stapler, etc.
The side wall forming blank 30 and the top cover forming blank 20 described below may be cut out from a single cardboard sheet, or may be cut out from separate cardboard sheets.

The top cover 11b of this embodiment is formed using one top cover forming blank 20 shown in Fig. 10. The top cover forming blank 20 can be easily obtained by, for example, punching and cutting a sheet of corrugated cardboard so as to have a predetermined shape when the top cover 11b is unfolded.
The fold lines and cuts described above are provided at appropriate locations on the top cover forming blank 20. This allows the top cover 11b having a three-dimensional shape as shown in FIG. 4 to be easily assembled using the top cover forming blank 20.

10, the top-lid forming blank 20 of this embodiment has a substantially rectangular shape in plan view, and has a longitudinal direction _X2 and a width direction _Y2 perpendicular to the longitudinal direction _X2 . The top-lid forming blank 20 also has a top-lid forming surface 28 that forms the top surface portion 17 in the top lid 11b, and a pair of first to fourth outer peripheries 21, 22, 23, 24 that are peripheral portions of the top-lid forming surface 28 and face each other.
The outer peripheral portion of the top surface forming surface 28 is a portion surrounding the periphery of the top surface forming surface 28 and forms the peripheral portion of the top-lid forming blank 20. The top surface forming surface 28 has an octagonal shape that is long in one direction with the four corners of the rectangle cut out diagonally in a plan view. The top surface forming surface 28 has a short side portion of the octagon, i.e., an edge e of the diagonally cut portion that has angles in both the longitudinal direction _X2 and the width direction _Y2 , and has an insertion hole b along the edge e. Hereinafter, the edge e of the diagonally cut portion of the top surface forming surface 28 is also referred to as the "hypothetic edge e."
The first to fourth outer peripheral portions 21, 22, 23, 24 are arranged along the circumferential direction of the top surface forming surface 28. More specifically, the blank 20 has a pair of first outer peripheral portions 21, 21 arranged along the longitudinal direction _X2 of the top surface forming blank 20, a pair of second outer peripheral portions 23, 23 arranged along the width direction _Y2 of the top surface forming surface 28, and a pair of third outer peripheral portions 22, 22 and a pair of fourth outer peripheral portions 24, 24 connected diagonally outwardly to the four corners of the top surface forming surface 28, and the third outer peripheral portion 22 and the fourth outer peripheral portion 24 are located on both sides of the first outer peripheral portion 21 in the circumferential direction of the top surface forming surface 28. The pair of third outer peripheral portions 22, 22 and the pair of fourth outer peripheral portions 24, 24 form the four corners of the top surface forming blank 20. The pair of third outer peripheral portions 22, 22 and the pair of fourth outer peripheral portions 24, 24 have, diagonally outwardly in a plan view, edges parallel to the oblique side edge e, and protrusions a protruding diagonally outwardly from the edges.

The upper cover forming blank 20 of this embodiment has triangular folded portions 26 on both sides of the third outer periphery 22 in the circumferential direction of the top surface forming surface 28 and on both sides of the fourth outer periphery 24 in the circumferential direction. That is, in the circumferential direction of the top surface forming surface 28, the folded portions 26 are interposed between the first outer periphery 21 and the third outer periphery 22, between the second outer periphery 23 and the third outer periphery 22, between the first outer periphery 21 and the fourth outer periphery 24, and between the second outer periphery 23 and the fourth outer periphery 24. Cut lines are formed at the boundary between the third outer periphery 22 and the folded portion 26, and at the boundary between the fourth outer periphery 24 and the folded portion 26, so that the third outer periphery 22 and the folded portion 26 can be separated, and the fourth outer periphery 24 and the folded portion 26 can be separated. With this configuration, the folding portion 26 can be folded so that it overlaps the third outer periphery 22 and the fourth outer periphery 24.

The top cover forming blank 20 of this embodiment has a diagonal fold curve c3 extending along the oblique edge e at approximately the midpoint between the tip of the convex portion a in the diagonal direction and the insertion hole b of the top surface forming surface 28 in each of the third outer peripheral portion 22 and the fourth outer peripheral portion 24. The top cover forming blank 20 also has fold curves (not shown) between the adjacent outer peripheral portions 21, 22, 23, 24 and the folded portion 26 in the circumferential direction of the top surface forming surface 28. Furthermore, the top cover forming blank 20 has a peripheral fold curve (not shown) along the periphery of the top surface forming surface 28.

In this embodiment, the top cover 11b can be formed by folding the top cover forming blank 20 along the aforementioned fold lines of the blank 20. More specifically, the outer peripheral portion of the top surface forming surface 28 is folded toward the top surface forming surface 28 along the peripheral fold lines, and each folded portion 26 is folded so as to overlap the third outer peripheral portion 22 or the fourth outer peripheral portion 24. Next, the third outer peripheral portion 22 and the fourth outer peripheral portion 24 are each folded toward the top surface forming surface 28 along the diagonal fold line c3, and the convex portion a is inserted into the insertion hole b of the top surface forming surface 28. In this manner, the top cover 11b can be formed.

The lower container 10b of this embodiment has a bottom forming portion 14b. The bottom forming portion 14b has the same configuration as the upper cover 11b described above. That is, in this embodiment, the upper cover 11b can be used as the bottom forming portion 14.
The bottom forming portion 14b of this embodiment can be formed by folding a bottom forming blank. The bottom forming blank of this embodiment has the same structure as the top cover forming blank 20 described above.

The present invention is not limited to the above-described embodiment and can be modified as appropriate. In addition, the above-described embodiments may be combined.
As long as the effects of the present invention are achieved, the configuration of the upper storage body 10a and the configuration of the lower storage body 10b may be different from each other. For example, the lower storage body 10b may have a storage body 12b formed from a member forming the side wall portion 15b and a member 14b forming the bottom portion 13b, while the upper storage body 10a may be formed from a single member including a portion forming the side wall portion 15a and a portion forming the bottom portion 13a.
The laminated package 1 may be transported or stored with a net or a polyethylene stretch film wrapped around it in multiple layers. Such a laminated package 1 is displayed with the net or stretch film removed.

1 Stacked packaging body 4 Small packaging body 4R Loading body 10 Container body 11 Top lid 12 Container body 13 Bottom 15 Side wall portion 20 Top lid forming blank 30 Side wall forming blank A Upper layer packaging body B Lower layer packaging body X Longitudinal direction Y Width direction Z Height direction

Claims (10)

A stacked package including a lower package and an upper package stacked on the lower package,
Each of the upper and lower packing bodies includes a container body having an opening and a bottom, and an upper lid that covers the opening,
a locking portion having a base end and a free end is formed on each of the top lid of the lower packaging body and the bottom of the top packaging body, and the base end of the locking portion is continuous with the top lid or the bottom,
A plurality of small packages are stacked and housed inside each of the upper package and the lower package,
a bottom part of the upper packaging body is deformed to form an upper fitting part that is convex downward, and a top cover of the lower packaging body is deformed to form a lower fitting part that is convex downward, and the upper fitting part and the lower fitting part are fitted together,
The lower fitting portion is inserted into the storage body of the lower packaging body,
A laminated package, wherein the upper cover and the bottom engaging portions are engaged with each other in a state where they are bent downward with the base end portion acting as a flexible axis. The small package in the lower package includes a packaging bag formed from a sheet material containing a synthetic resin, and a product is contained in an internal space of the packaging bag,
2. The laminated packaging body according to claim 1, wherein the internal space is filled with gas, and the volume of the small packaging body under standard conditions (20°C, 1 atmosphere) has an expansion rate H, which is the ratio to the volume V4 of the outer packaging bag when the internal pressure of the packaging bag is increased to 1.1 atmospheres, of 60% or more and 90% or less. The small package in the lower package includes a packaging bag formed from a sheet material containing a synthetic resin, and a product is contained in an internal space of the packaging bag,
3. The laminated packaging body according to claim 1 or 2, wherein a gas is sealed in the internal space, and the porosity, which is the ratio of the volume of the space between the packaging bag and the product to the volume of the small packaging body, is 30% or more and 80% or less under standard conditions (20°C, 1 atmosphere). The lower fitting portion is adapted to at least temporarily come into contact with a portion of the small packages disposed in the storage body,
The stacked packaging body according to any one of claims 1 to 3, wherein the plurality of small packaging bodies in the lower packaging body are stacked so as to function as supports that prevent further deformation of the lower fitting portion when they come into contact with the lower fitting portion. a guide line for guiding the formation of the lower fitting portion is formed on an upper cover of the lower packaging body,
The laminated packaging body according to any one of claims 1 to 4 , wherein a guide line for guiding the formation of the upper fitting portion is formed on a bottom portion of the upper packaging body. The laminated packaging body according to any one of claims 1 to 5 , wherein the storage body is formed from a single member including a portion forming the side wall portion and a portion forming the bottom portion. The laminated packaging body according to any one of claims 1 to 6 , wherein the storage body is formed from a member forming a side wall portion and a member forming the bottom portion. The stacked package according to any one of claims 1 to 7 , wherein the plurality of small packages are housed in at least the lower package with a space remaining at the top. The small package in the lower package includes a packaging bag formed from a sheet material containing a synthetic resin, and a product is contained in an internal space of the packaging bag,
The laminated package according to any one of claims 1 to 8 , wherein the small package contains a plurality of the products. The small package in the lower package includes a packaging bag formed from a sheet material containing a synthetic resin, and a product is contained in an internal space of the packaging bag,
The laminated package according to any one of claims 1 to 9 , wherein the goods include a pouch containing a liquid therein.

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