Accommodating body and method for manufacturing the same

Abstract

To solve the problems, the present application comprises: a package material stack (10M) in which a plurality of package materials (10) for wrapping a rice ball (50) are stacked, each of the package materials (10) being in a state of individually wrapping a sheet-shaped food, i.e., a seaweed sheet (40); a sheet-shaped base member (20) in which the package material stack (10M) is arranged on one side (20a) thereof; and a storage bag (30) in which the package material stack (10M) and the base member (20) are stored and sealed in a state of a vacuum bag.

Description

Technical Field

[0001] This invention relates to a container suitable for transporting multiple packaging materials together and a method for manufacturing the same. Background Technology

[0002] Currently, rice is individually packaged into rice balls of a specified shape and sold in convenience stores or supermarkets. One packaging material for these rice balls contains sheet-like foods such as seaweed, which are encased within a double-layered packaging material with an outer and inner film. The outer film, with its slits, is separated to the left and right, while the inner film is torn open to the left and right, allowing the sheet-like food to be wrapped around the rice (see Patent Document 1, etc.). For example, when dried seaweed is used as the sheet-like food, since the seaweed does not come into contact with the rice before opening, a crispy seaweed texture can be enjoyed.

[0003] Here, in the manufacturing plant, under certain circumstances, about 50 to 100 of the aforementioned packaging materials containing and stacking sheet food are placed in bags such as polyethylene bags and transported to the packaging process location, where the packaging materials are then removed one by one to package rice.

[0004] [Preliminary Technology Documents]

[0005] (Patent Documents)

[0006] Patent Document 1: Japanese Patent Application Publication No. 2015-104315 Summary of the Invention

[0007] [The problem the invention aims to solve]

[0008] When transporting large quantities of packaging materials containing sheet-like food items within bags such as polyethylene bags, the packaging materials may sometimes shift during transport, causing deformation such as bending or bending of the packaging materials or the food inside. Deformation of the packaging materials or the food can hinder the process of individually removing individual packages from the bulk packaging, or make it difficult to wrap rice properly. Furthermore, there is a concern that the food may absorb moisture from the air inside the bag, becoming damp and reducing its original dry texture and flavor.

[0009] The present invention was developed in view of the above circumstances, and its purpose is to provide a container and a method for manufacturing the same, which can prevent the packaging material or food from deforming and the food from getting damp when transporting packaging materials containing sheet-like food.

[0010] [Technical means to solve the problem]

[0011] (1) The containment body of the present invention comprises: a packaging material laminate, which is formed by stacking a plurality of packaging materials for wrapping rice balls, each of which is in the state of individually wrapping sheet food; a sheet base member, on one side of which the aforementioned packaging material laminate is disposed; and a containment bag, which contains the aforementioned packaging material laminate and the aforementioned base member and is sealed into a vacuum bag.

[0012] (2) Preferably, in (1), each of the plurality of packaging materials constituting the aforementioned packaging material laminate is such that the inner surface of the side in contact with the aforementioned rice ball is located on the aforementioned base member side, and in the aforementioned packaging material laminate, each end of the plurality of packaging materials disposed on the surface side opposite to the aforementioned base member in one direction is bent toward the aforementioned base member side by the aforementioned receiving bag.

[0013] (3) Preferably, in (1), each of the plurality of packaging materials constituting the aforementioned packaging material laminate is such that the inner surface of the side in contact with the aforementioned rice ball is located on the side of the aforementioned base member, the aforementioned base member has a folded-back portion, the folded-back portion folds back toward the aforementioned side of the base member and covers each end of both sides in one direction of the aforementioned packaging material laminate, in the aforementioned packaging material laminate, each end of both sides in one direction of the plurality of aforementioned packaging materials at least disposed on the surface side opposite to the aforementioned base member is bent toward the aforementioned base member side by the aforementioned folded-back portion.

[0014] (4) The method for manufacturing the containment body of the present invention includes the following steps: individually packaging a sheet-shaped food in packaging material for wrapping rice balls; stacking multiple packaging materials containing the aforementioned food separately on one side of a sheet-shaped base member to form a packaging material stack; containing the aforementioned packaging material stack and the aforementioned base member in a containment bag; and evacuating the aforementioned containment bag and sealing the aforementioned packaging material stack and the aforementioned base member inside the containment bag to form a vacuum bag.

[0015] [Invention Effects]

[0016] According to the present invention, a container and a method thereof can be provided, which can prevent the packaging material or food from deforming and the food from getting damp during the transportation of packaging material containing sheet food. Attached Figure Description

[0017] Figure 1 This is a plan view illustrating the housing of the first embodiment.

[0018] Figure 2 yes Figure 1 Section II-II.

[0019] Figure 3This is an exploded perspective view illustrating the packaging material laminate and base component of the first embodiment.

[0020] Figure 4 This is a plan view illustrating the surface side of the packaging material according to the first embodiment.

[0021] Figure 5 This is an inner view of the packaging material according to the first embodiment.

[0022] Figure 6 This is an exploded perspective view of the packaging material according to the first embodiment.

[0023] Figure 7 yes Figure 6 Section VII-VII.

[0024] Figure 8 This is a schematic diagram illustrating the process of taking out a sheet of packaging material from the stack of packaging materials to wrap the rice ball according to the first embodiment.

[0025] Figure 9 This is a three-dimensional diagram illustrating a rice ball wrapped in packaging material according to the first embodiment.

[0026] Figure 10 This is a plan view illustrating the housing of the second embodiment.

[0027] Figure 11 yes Figure 10 XI-XI cross-sectional view. Detailed Implementation

[0028] The embodiments will now be described with reference to the accompanying drawings.

[0029] (First Implementation)

[0030] Figure 1 This is a plan view of the housing 1 according to the first embodiment. Figure 2 yes Figure 1 Section II-II. Figure 3 This is an exploded perspective view showing the packaging material laminate 10M and the base component 20 that constitute the containment body 1. Figures 1-3 As shown, the containment body 1 includes: a packaging material laminate 10M on which multiple packaging materials 10 are stacked, a base component 20, and a containment bag 30.

[0031] Figures 1-3 Arrows L and W, as shown, represent the length and width directions of the housing 1, packaging material 10, packaging material laminate 10M, and base component 20, respectively. Furthermore, the same applies to... Figures 4 to 11 .

[0032] The packaging material laminate 10M is composed of multiple rectangular packaging materials 10 stacked together. In this embodiment, the packaging material 10 is a rectangular film that wraps the rice ball 50 (described later), which is a rice ball formed by grasping rice and shaping it into a triangular shape. Each of the multiple packaging materials 10 individually packages a sheet of food 40. That is, the packaging material laminate 10M is configured to consist of multiple packaging materials 10 stacked together, each of which individually packages a sheet of food 40. The housing 1 of this embodiment is manufactured in a factory that manufactures large quantities of rice balls 50.

[0033] The sheet food 40 can include, for example, thin sheets of seaweed such as roasted seaweed wrapped around the rice ball 50, but is not limited to this. Other sheet foods 40 can include thinly rolled rectangular foods such as dried kelp strips (Tororo-kombu), omelets, and dried small sardine slices. In any case, food 40 is a flexible sheet food that can be wrapped around the rice ball 50.

[0034] In this article, we will use seaweed 40 as an example to illustrate the process. The rectangular seaweed 40 has a size and shape that can wrap rice balls 50. In the following description, the packaging material 10 containing seaweed 40 is sometimes referred to as seaweed-containing packaging material 10B. The packaging material stack 10M has, for example, approximately 50 to 100 sheets of seaweed-containing packaging material 10B stacked together.

[0035] Figure 4 This is a plan view of the seaweed packaging material 10B as seen from the surface 10s side. Figure 5 This is an inner view of packaging material 10B containing seaweed. Figure 6 This is an exploded perspective view of the seaweed packaging material 10B. Figure 7 yes Figure 6 Section VII-VII.

[0036] like Figures 4-7 As shown, the packaging material 10 includes an outer film 11 with a flexible surface 10s side and an inner film 12 with a flexible inner surface 10g side. The inner surface 10g side refers to the side that contacts the rice ball 50. Seaweed 40 is sandwiched between the outer film 11 and the inner film 12. Figure 6 and Figure 7 In the middle, an inner film 12 is disposed on the lower side of the outer film 11. Each packaging material 10 of the packaging material laminate 10M is laminated with an outer film 11 and an inner film 12 disposed on the same side.

[0037] The outer membrane 11 is a transparent or semi-transparent film made of synthetic resin such as polypropylene. Cutouts 11a are provided at the four corners of the outer membrane 11.

[0038] The inner membrane 12 has the same shape as the outer membrane 11. The inner membrane 12 has a left membrane 13 and a right membrane 14 that are separated from each other in the width direction, i.e., the left-right direction. The inner edges 13a and 14a of the left membrane 13 and the right membrane 14 overlap each other. The inner membrane 12 has cutouts 12a that are the same as those of the outer membrane 11 at its four corners.

[0039] like Figure 4 and Figure 5 As shown, the peripheral portions of the outer film 11 and the inner film 12 are joined together via a sealing portion 15. The sealing portion 15 is the portion that joins the outer film 11 and the inner film 12 by means of welding or the like. The sealing portion 15 includes a plurality of first sealing portions 15a, a plurality of second sealing portions 15b, and a plurality of third sealing portions 15c. The first sealing portions 15a are disposed at the four corners of the packaging material 10. The second sealing portions 15b are rectangular and are disposed at equal intervals between the first sealing portions 15a at both ends in the length direction. The third sealing portions 15c are elongated shapes extending in the width direction and are disposed in pairs at each end in the length direction.

[0040] A strip of tearable adhesive tape 16 extending along its length is affixed to the inner surface of the central portion of the outer film 11 in the width direction. The tearable adhesive tape 16 is a film made of synthetic resin. The tearable adhesive tape 16 extends along the entire length of the outer film 11. The outer film 11 can be separated in the width direction, i.e., the left-right direction, by tearing the tearable adhesive tape 16 from one end. Grooves 17a are provided on both sides of the tearable adhesive tape 16 at both ends of the outer film 11 in the length direction. An operating tab 17, which can be flipped up from the packaging material 10, is provided by clamping the pair of grooves 17a of the tearable adhesive tape 16. By pinching the operating tab 17 with fingers, the tearable adhesive tape 16 can be easily torn along its entire length.

[0041] When the outer film 11 and the inner film 12 are joined, the seaweed 40 is sandwiched between the outer film 11 and the inner film 12 and housed inside the packaging material 10. Alternatively, after joining the outer film 11 and the inner film 12, it can be inserted between the left film 13 and the right film 14 in the width direction of the inner film 12, thereby being housed inside the packaging material 10.

[0042] The base component 20 is a sheet-like component. The base component 20 uses materials such as sheets made of synthetic resin or corrugated cardboard, which have a certain thickness and rigidity that maintains their original shape even after elastic deformation. In the case of sheets made of synthetic resin, examples of materials include acrylic resin, polystyrene, AS resin, and PET. The base component 20 is a rectangle slightly larger than the packaging material 10. A packaging material laminate 10M is disposed on one side 20a of the base component 20. The packaging material laminate 10M is placed on one side 20a of the base component 20 with the length direction of the packaging material 10 parallel to the length direction of the base component 20. Each packaging material 10 of the packaging material laminate 10M is laminated on the base component 20 with its inner film 12 on the inner surface 10g side facing the base component 20 side.

[0043] The containment bag 30 contains the packaging material laminate 10M and the base component 20, and seals the packaging material laminate 10M and the base component 20 into a vacuum bag state. The containment bag 30 is a bag formed from a flexible transparent or translucent synthetic resin film. As this synthetic resin film, a single-layer or multi-layer synthetic resin film is used. In the case of a single layer, for example, it is a synthetic resin film such as polyethylene or polypropylene. In the case of a multi-layer layer, for example, a three-layer synthetic resin film is preferably used, wherein the three-layer synthetic resin film uses polyethylene to sandwich a PVDC (polyvinylidene chloride) barrier layer to form a moisture barrier. The containment bag 30 can be, for example, a rectangular three-sided bag with an edge opening on only one short side. In this case, the packaging material laminate 10M and the base component 20 are contained inside the containment bag 30 through the opening, the air inside the containment bag 30 is drawn out to form a vacuum state, and it is sealed by means of welding the opening portion, etc. Thus, the packaging material laminate 10M and the base component 20 are sealed inside the containment bag 30 in a vacuum bag state. Furthermore, the containment bag 30 is not limited to a three-sided bag; it can also be formed by, for example, placing and bonding the packaging material laminate 10M and the base component 20 between two synthetic resin sheets and welding the outer periphery to create a vacuum bag.

[0044] The stack of packaging materials 10M is compressed by the receiving bag 30 in the stacking direction of the multiple packaging materials 10. Thus, as... Figure 2 As shown, among the multiple packaging materials 10 of the packaging material laminate 10M, at least one is disposed on the surface side opposite to the base member 20. Figure 2 The ends 10e on both sides of the width direction of the specified amount of packaging material 10 (top side) are bent toward the base member 20 by means of the receiving bag 30. Moreover, over time, this bending becomes fixed and habitual.

[0045] The housing 1 of the above embodiment can be manufactured in the following manner.

[0046] First, seaweed 40 is individually packaged in each packaging material 10. Next, the seaweed-containing packaging materials 10B, which are the individual packaging materials 10 containing seaweed 40, are bundled into a predetermined number of sheets (e.g., 50 to 100 sheets) and arranged in a stacked state on one side 20a of the base member 20. That is, the packaging material stack 10M is arranged on one side 20a of the base member 20. Next, the packaging material stack 10M and the base member 20 are housed in a receiving bag 30. Then, the receiving bag 30 is evacuated, and the packaging material stack 10M and the base member 20 are sealed inside the receiving bag 30 to form a vacuum bag.

[0047] By forming a vacuum bag, the seaweed 40 can be prevented from getting damp. In addition, when the base component 20 is corrugated cardboard, the base component 20 may sometimes contain moisture, but by forming a vacuum bag, its moisture content is reduced and the seaweed 40 can be prevented from getting damp.

[0048] Figure 8 The following process is schematically illustrated: In a factory that manufactures a large number of rice balls 50, a sheet of seaweed-containing packaging material 10B, taken from a stack of packaging materials 10M, is placed over a rice ball 50 formed into a triangular shape by grasping rice for packaging. The container 1 of the above embodiment is transported to the location of this process, the container bag 30 is opened, the stack of packaging materials 10M is taken out, and placed on a designated take-out table 60. In the stack of packaging materials 10M placed on the take-out table 60, each seaweed-containing packaging material 10B is stacked in a generally horizontal state with the inner film 12 disposed on the lower side. Since multiple seaweed-containing packaging materials 10B are stacked on one side 20a of the base member 20 and transported in a state where a vacuum bag is formed by the container bag 30, deformation of the packaging material 10 or seaweed 40 can be suppressed.

[0049] Below the packaging material stack 10M, a rice ball 50, shaped into a triangular shape by grasping rice, is arranged horizontally. A piece of seaweed-containing packaging material 10B located at the bottom is picked up from the packaging material stack 10M using a vacuum pick-up device or the like (not shown), removed downwards, and placed on top of the rice ball 50.

[0050] Here, from Figure 8The ends 10e on both sides of a single sheet of packaging material 10 taken from the packaging material laminate 10M shown bend downwards towards the side where the rice ball 50 is disposed, and are accustomed to a bent state. This is because, as described above, the packaging material laminate 10M disposed on one side 20a of the base member 20 is formed into a vacuum bag by the receiving bag 30. Multiple packaging materials 10 in the packaging material laminate 10M near the base member 20 are pressed against the flat and rigid side 20a of the base member 20, making it difficult to bend. However, multiple packaging materials 10 laminated on the surface opposite to the base member 20 are pressed against the flexible packaging material 10 by the compressive force generated by the vacuum bag, making it easy to bend and bend.

[0051] If each end 10e on both sides of the width direction of the packaging material 10 is shaped in this manner, the packaging material 10 forms the shape of the outer surface of the rice ball 50 below, suppressing it from curling upwards to the side opposite to the rice ball 50. This makes it easier to wrap the rice ball 50 with the seaweed-containing packaging material 10B and can suppress packaging defects.

[0052] Next, wrap the rice ball 50 with seaweed-containing packaging material 10B, and use sealing tape or similar materials to maintain the overlapping parts of the packaging material 10, thus obtaining... Figure 9 The image shows a packaged rice ball 50B wrapped in seaweed packaging material 10B. Packaged rice balls 50B are sold in supermarkets or convenience stores.

[0053] When opening the packaged rice ball 50B, first, pinch and stretch the operating piece 17 with your fingers to tear the peelable adhesive tape 16 surrounding the rice ball 50, separating the outer membrane 11 to the left and right. Next, pinch the left side of the separated outer membrane 11 and the left side membrane 13 of the inner membrane 12, while simultaneously pinching the right side of the separated outer membrane 11 and the right side membrane 14 of the inner membrane 12, and pull them apart to the left and right. As a result, the outer membrane 11 and the inner membrane 12 separate to the left and right, and the remaining seaweed 40 adheres to the rice ball 50 in a rolled-up state, making the rice ball 50 with seaweed 40 edible.

[0054] The first embodiment described above includes: a packaging material laminate 10M, which is formed by stacking multiple packaging materials 10 for wrapping rice balls 50, each of which is a separate package for a sheet food, namely seaweed 40; a sheet base member 20, on which the packaging material laminate 10M is disposed; and a storage bag 30, which contains the packaging material laminate 10M and the base member 20 and seals them into a vacuum bag.

[0055] Therefore, when transporting multiple packaging materials 10 containing seaweed 40, deformation of the packaging materials 10 or seaweed 40 and moisture absorption of the seaweed 40 can be prevented. As a result, it is easier to wrap the packaging materials 10 on the rice ball 50 while enjoying the crispy texture of the dried seaweed 40.

[0056] Preferably, in the housing 1 of the first embodiment, each of the plurality of packaging materials 10 constituting the packaging material laminate 10M is such that the inner surface 10g of the side that contacts the rice ball 50 is located on the base member 20 side. In the packaging material laminate 10M, the ends 10e of the plurality of packaging materials 10 disposed on the surface side opposite to the aforementioned base member 20 are bent toward the base member 20 side by means of the housing bag 30.

[0057] Therefore, the packaging material 10 can be placed on the rice ball 50 and the packaging operation can be carried out smoothly, thus improving the efficiency of the operation.

[0058] The manufacturing method of the containment body 1 according to the first embodiment includes the following steps: individually packaging seaweed 40 as a sheet food in the packaging material 10 that wraps rice ball 50; stacking multiple packaging materials 10, each individually packaged with seaweed 40, on one side 20a of the sheet base member 20 to arrange the packaging material stack 10M; containing the packaging material stack 10M and the base member 20 in a containment bag 30; and evacuating the containment bag 30 and sealing the packaging material stack 10M and the base member 20 in the containment bag 30 to form a vacuum bag.

[0059] Therefore, it is possible to manufacture a container 1 that can prevent deformation of the packaging material 10 or the seaweed 40 and prevent the seaweed 40 from getting damp when transporting multiple packaging materials 10 containing the seaweed 40.

[0060] (Second Implementation)

[0061] Next, refer to Figure 10 and Figure 11 The second embodiment will be described.

[0062] The housing 1 of the second embodiment differs from the first embodiment in the shape of its base component 20, but the other components are the same. Therefore, the same symbols are used for components common to the first embodiment, and the descriptions are omitted; only the differences are explained.

[0063] like Figure 10 and Figure 11As shown, the base member 20 of the second embodiment has folded-back portions 25 at both ends in the width direction. The folded-back portions 25 fold back towards one side 20a of the base member 20 and cover both ends of the packaging material laminate 10M in the width direction. The base member 20 of the second embodiment has a flat arrangement portion 21 on which the packaging material laminate 10M is disposed and a pair of left and right folded-back portions 25 folded back from both ends of the arrangement portion 21 in the width direction inward of the arrangement portion 21. The left and right folded-back portions 25 may be formed in advance, and then the packaging material laminate 10M may be disposed on the top of the arrangement portion 21 between the two folded-back portions 25. Alternatively, each folded-back portion 25 may be formed after the packaging material laminate 10M is disposed.

[0064] In the second embodiment, with the two ends of the packaging material laminate 10M covered by the folded-back portions 25 in the width direction, the interior of the storage bag 30 is evacuated. The packaging material laminate 10M is compressed by the storage bag 30 in the stacking direction of the multiple packaging materials 10, and furthermore, its two ends are compressed by the folded-back portions 25 of the base member 20 in the stacking direction of the multiple packaging materials 10. Thus, as Figure 11 As shown, among the multiple packaging materials 10 of the packaging material laminate 10M, at least one is disposed on the surface side opposite to the base member 20. Figure 11 The ends 10e on both sides of the width direction of the specified amount of packaging material 10 (top side) are bent toward the base member 20 by means of the fold-back portion 25. Moreover, over time, this bending becomes fixed and habitual.

[0065] In the second embodiment, which is the same as the first embodiment, a plurality of packaging materials 10 stacked on the surface side opposite to the base member 20 are pressed onto the flexible packaging material 10 by the pressing pressure received from the fold-back portion 25, thereby becoming easy to bend and adapt.

[0066] If the ends 10e on both sides of the width direction of the packaging material 10 are respectively shaped in this manner, then as Figure 8 As shown, the packaging material 10 is shaped along the outer surface of the rice ball 50, making it easier to wrap the rice ball 50 with the seaweed-containing packaging material 10B and suppressing poor packaging.

[0067] In the housing 1 of the second embodiment, each of the plurality of packaging materials 10 constituting the packaging material laminate 10M is laminated such that the inner surface 10g of the side in contact with the rice ball 50 is located on the base member 20 side. The base member 20 has a folded-back portion 25 that folds back toward one side 20a of the base member 20 and covers both ends of the packaging material laminate 10M in the width direction. In the packaging material laminate 10M, the ends 10e of the plurality of packaging materials 10 disposed on at least one side of the surface 10s opposite to the base member 20 are bent toward the base member 20 side by means of the folded-back portion 25.

[0068] Therefore, the packaging material 10 can be used to cover the rice ball 50 to facilitate packaging operations and improve work efficiency.

[0069] The present invention is not limited to the above embodiments and appropriate modifications can be made.

[0070] For example, the base component 20 may be configured such that at least one side 20a of the packaging material laminate 10M is configured to be curved in the width direction or in a mountain shape, and not only the ends 10e on both sides in the width direction but the entire packaging material 10 is in a curved state.

[0071] In addition to bending and shaping the ends 10e on both sides of the width direction of the packaging material 10, the ends on both sides of the length direction of the packaging material 10 can also be bent and shaped.

[0072] Figure Labels

[0073] 10 Packaging Materials

[0074] 10e Both ends of packaging material

[0075] 10g inner surface of packaging material

[0076] 10M Packaging Material Laminate

[0077] 20 base components

[0078] 20a One side of the base component

[0079] 25-fold return

[0080] 30 containment bags

[0081] 40Food (seaweed)

[0082] 50 rice balls

Claims

1. A storage body comprising: a packaging material stack in which a plurality of packaging materials for wrapping rice balls are stacked, each of the packaging materials being in a state of individually packaging a sheet-shaped food; a sheet-shaped base member on one surface side of which the packaging material stack is disposed; and each of the plurality of packaging materials constituting the packaging material stack is stacked with an inner surface of a side in contact with the rice ball positioned on the base member side, at least each end portion of both sides in one direction of the plurality of packaging materials disposed on a surface side of a side opposite to the base member is bent toward the base member side by the storage bag.

2. A storage body comprising: a packaging material stack in which a plurality of packaging materials for wrapping rice balls are stacked, each of the packaging materials being in a state of individually packaging a sheet-shaped food; a sheet-shaped base member on one surface side of which the packaging material stack is disposed; and a storage bag in which the packaging material stack and the base member are stored and sealed in a state of a vacuum bag, wherein each of the plurality of packaging materials constituting the packaging material stack is stacked with an inner surface of a side in contact with the rice ball positioned on the base member side, the base member has a folded-back portion folded back toward the one surface side of the base member and covering each end portion of both sides in one direction of the packaging material stack, and each end portion of both sides in one direction of the plurality of packaging materials disposed on a surface side of a side opposite to the base member is bent toward the base member side by the folded-back portion. Steps comprising: The containment bag contains the aforementioned packaging material laminate and the aforementioned base component, and is sealed into a vacuum bag state, wherein... individually packaging a sheet-shaped food in a packaging material for wrapping a rice ball; stacking a plurality of the packaging materials in which the food is individually packaged on one surface side of a sheet-shaped base member to dispose a packaging material stack; storing the packaging material stack and the base member in a storage bag; and vacuuming the inside of the storage bag and sealing the packaging material stack and the base member in the storage bag to form a vacuum bag, wherein each of the plurality of packaging materials constituting the packaging material stack is stacked with an inner surface of a side in contact with the rice ball positioned on the base member side, bending, by the storage bag, each end portion of both sides in one direction of the plurality of packaging materials disposed on a surface side of a side opposite to the base member toward the base member side. Steps comprising: individually packaging a sheet-shaped food in a packaging material for wrapping a rice ball; stacking a plurality of the packaging materials in which the food is individually packaged on one surface side of a sheet-shaped base member to dispose a packaging material stack; 3. A method of manufacturing a housing, wherein, storing the packaging material stack and the base member in a storage bag; and vacuuming the inside of the storage bag and sealing the packaging material stack and the base member in the storage bag to form a vacuum bag, wherein each of the plurality of packaging materials constituting the packaging material stack is stacked with an inner surface of a side in contact with the rice ball positioned on the base member side, bending, by the storage bag, each end portion of both sides in one direction of the plurality of packaging materials disposed on a surface side of a side opposite to the base member toward the base member side. ​ ​ ​ 4. A method of manufacturing a housing, wherein ​ ​ ​ ​ ​ ​ The aforementioned base member has a folded-back portion folded back toward the aforementioned one side of the base member and covering each end portion of both sides in one direction of the aforementioned packaging material laminate, By the aforementioned folded-back portion, each end portion of both sides in one direction of a plurality of the aforementioned packaging materials disposed at least on the surface side of the side opposite to the aforementioned base member is bent toward the aforementioned base member side.

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