Food packaging materials and food packaging bodies

Abstract

To provide a food packaging material and a food packaging body that can improve food holdability when opened.SOLUTION: A food packaging material 1 includes: an outer sheet 2 having a long shape in a first direction; and an inner sheet 3 that is overlaid on the outer sheet 2 interposing a sheet-shaped food product 4 and is composed of a first inner sheet piece 30 and a second inner sheet piece 31 having an overlapping part 32 between inner sides thereof along a second direction orthogonal to the first direction. Therein: the outer sheet 2 and the inner sheet 3 are joined to surround the sheet-shaped food product 4 by end joints and peelable side joints; and a sheet having higher rigidity than the inner sheet 3 is used for the outer sheet 2. This makes it possible to improve food holdability of the outer sheet 2 of when a package is opened.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a food packaging material for packaging food and a food package obtained by packaging food with the food packaging material.

Background Art

[0002] As a food packaging material for packaging foods such as processed rice foods like triangular rice balls (mainly regular triangular) with a front shape of a triangular shape (predominantly a regular triangular shape) and having a predetermined thickness, there is one described in Patent Document 1. This includes an outer sheet having a shape long in a first direction, and an inner sheet composed of a pair of inner sheet pieces that are overlapped with the outer sheet with a sheet-like food sandwiched therebetween and have an overlapping portion between the inner portions along a second direction orthogonal to the first direction, and the outer sheet and the inner sheet are joined so as to surround the sheet-like food by an end joining portion and a peelable side joining portion.

[0003] The method of packaging food with the food packaging material is as follows. First, the food is placed on the first inner sheet piece, then the food packaging material is folded in half in the longitudinal direction, then folded so that one of the extra sheet pieces on either side is overlapped on the portion covering the front of the food in the food packaging material, and then folded so that the other extra sheet piece is overlapped thereon. Thereby, the food package is completed.

[0004] The method of opening the food package is as follows. First, open the extra sheet pieces on both folded sides, unfold the food packaging material, place the food on the second inner sheet piece, then peel the first inner sheet piece from the outer sheet, then transfer the food onto the sheet-like food, and then peel the second inner sheet piece from the outer sheet. Thereby, the food and the sheet-like food can be eaten integrally.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] However, in the food packaging material described in Patent Document 1, plastic sheets are used for both the outer and inner sheets. Plastic sheets lack rigidity and have poor food retention. As a result, food sometimes falls out of the food packaging material during opening, rendering it inedible.

[0007] Therefore, the present invention has been made in view of these circumstances, and aims to provide a food packaging material and a food packaging body that can improve the food retention properties when opened. [Means for solving the problem]

[0008] The food packaging material according to the present invention is The device comprises an outer sheet having a shape elongated in a first direction, and an inner sheet consisting of a first inner sheet piece and a second inner sheet piece that are superimposed on the outer sheet with a sheet-like food sandwiched in between, and having overlapping portions on their inner sides along a second direction perpendicular to the first direction. The outer sheet and the first inner sheet piece at one end in the first direction end joint , the end joint between the outer sheet and the second inner sheet piece on the other end side in the first direction, and the outer sheet and the first inner sheet piece on both sides in the second direction Peelable side joint , and peelable side joints between the outer sheet and the second inner sheet piece on both sides in the second direction A food packaging material in which an outer sheet and an inner sheet are joined together so as to surround a sheet-like food product, The outer sheet uses a sheet with higher rigidity than the inner sheet. It is a food packaging material.

[0009] Here, as one embodiment of the food packaging material according to the present invention, The side joints between the outer sheet and the first inner sheet piece, and the side joints between the outer sheet and the second inner sheet piece, are provided in a removable manner in order to allow the sheet-like food to be exposed on the outer sheet and integrated with the food. This configuration can be adopted. Also, in this case, The outer sheet functions as a protective sheet to prevent hands from getting dirty on integrated food products and sheet-shaped food products. This configuration can be adopted.

[0010] Furthermore, another embodiment of the food packaging material according to the present invention is: The central part of the end in the first direction is an unjointed area where no end joint has been formed. This configuration can be adopted. Also, in this case, when packaging the food to form a food package, an additional joint portion for sealing the non-jointed portion is formed and a configuration thereof can be adopted.

[0011] Further, as another aspect of the food packaging material according to the present invention, the end joint portion is also peelable and a configuration thereof can be adopted.

[0012] Also, as another aspect of the food packaging material according to the present invention, the sheet-like food has a shape in which at least one of the length in the first direction or the width in the second direction is smaller than the accommodation portion of the sheet-like food defined by the inner edges of the end joint portion and the side joint portion, in the accommodation portion, at a location close to the outer edge of the sheet-like food, a regulation portion is formed where the outer sheet and the inner sheet are joined to regulate the movement of the sheet-like food, and the regulation portion is also peelable and a configuration thereof can be adopted. Also, in this case, The restricting portion is formed separately from the end joint and the side joint. This configuration can be adopted.

[0013] Further, as yet another aspect of the food packaging material according to the present invention, in the overlapping portion of the inner sheets, at a location inside the inner edge of the first inner sheet piece, a sealing portion is formed where the first inner sheet piece and the second inner sheet piece are joined along the second direction to seal the overlapping portion, and the sealing portion is also peelable and a configuration thereof can be adopted.

[0014] Also, in this case, the sealing portion is narrower in width than the side joint portion and a configuration thereof can be adopted.

[0015] Furthermore, as yet another embodiment of the food packaging material according to the present invention, Paper sheets are used for the outer covering. This configuration can be adopted.

[0016] Furthermore, the food packaging according to the present invention is By folding one of the above food packaging materials in half in the first direction with the food in between, and by folding the excess sheet pieces on both sides of the food packaging material so that they overlap the portion of the food packaging material that covers the front of the food, the food is packaged in a triangular shape. The label is affixed to the portion of the food packaging that covers the front of the food, and spans the folded excess sheet pieces on both sides. It is a food packaging material.

[0017] Here, as one embodiment of the food packaging according to the present invention, The outer surface of the label is provided with a first opening operation indicator section that indicates that the first operation when opening the food packaging is to peel off the label. On the outer surface of the portion of the food packaging that covers the front of the food, a section is provided that displays instructions for subsequent opening operations, including the second opening operation, which is the second operation when opening the food packaging. This section is hidden by the folded extra sheet pieces or labels on both sides until the first opening operation. This configuration can be adopted.

[0018] Furthermore, another embodiment of the food packaging according to the present invention is: At each corner of the triangular shape, flattened ear-shaped pieces are formed by overlapping excess sheets of food packaging material. At least one earlobe is not sealed. This configuration can be adopted. [Effects of the Invention]

[0019] According to the present invention, the outer sheet of the food packaging material is made of a sheet with higher rigidity than the inner sheet. Therefore, according to the present invention, the food retention performance of the outer sheet when the package is opened can be improved. [Brief explanation of the drawing]

[0020] [Figure 1] Figure 1 is an exploded perspective view of food packaging material. [Figure 2] Figure 2 is an external view of a food packaging material. [Figure 3] Figure 3 is an internal view of a food packaging material. [Figure 4] Figures 4(a) through 4(c) are explanatory diagrams illustrating the process of packaging food using food packaging materials. [Figure 5] Figures 5(a) and 5(b) are explanatory diagrams that continue from Figure 4(c). [Figure 6] Figure 6(a) is a front view of a food package containing food packaging material. Figure 6(b) is a rear view of the food package. [Figure 7] Figure 7(a) is an explanatory diagram of the process of opening food packaging. Figure 7(b) is a plan view of the display section that appears after the first opening operation, indicating the second opening operation and subsequent operations. [Figure 8] Figures 8(a) and 8(b) are explanatory diagrams that continue from Figure 7(a). [Figure 9] Figures 9(a) and 9(b) are explanatory diagrams that continue from Figure 8(b). [Modes for carrying out the invention]

[0021] Hereinafter, as one embodiment of the present invention, a food packaging material for making food into a triangular rice ball will be described, which is used for so-called triangular packaging, where the food is folded in half lengthwise with the food sandwiched in between, and the excess sheet pieces on both sides are folded towards the center, thereby packaging the food in a triangular shape, and a food package made by packaging food with this food packaging material will be described.

[0022] As shown in Figures 1 to 3, the food packaging material 1 comprises a main body 10. The main body 10 consists of a pair of sheets (outer sheet 2, inner sheet 3) that are overlapped with a sheet-like food 4 in between, and joined together to surround the sheet-like food 4. The pair of sheets have a shape in which one side is longer than the other in mutually perpendicular directions. The sheet-like food 4 is seaweed or the like used to wrap food. The pair of sheets are joined and sealed on all four sides by end joints 11, 11 on one end 10a and the other end 10b, and by side joints 12, 12 on both sides. Hereafter, the one side (up and down direction in Figures 2 and 3) will be referred to as the "longitudinal direction" or "first direction," and the other side (left and right direction in Figures 2 and 3) will be referred to as the "width direction" or "second direction."

[0023] The outer sheet 2 has a rectangular shape (rectangular shape) that is large enough to wrap food when folded in half along its length. The outer sheet 2 is made of paper, unbleached kraft paper, Japanese paper, mixed paper, synthetic paper, glassine paper, rayon paper, paper-like or paper-like material (collectively referred to as "paper"), or a sheet (film) mainly made of these materials (collectively referred to as "paper sheet" (film)). The paper may also contain bio-based polyethylene terephthalate (bio-based PET, so-called bio-PET). The outer sheet 2 may, if necessary, have heat-sealable properties on at least one side of its inner or outer surface, either entirely or partially in the necessary areas. For example, the outer sheet 2 is a laminated sheet (film) with paper as the outer layer and a plastic sheet (film) as the inner layer. As one form of the laminated sheet (film), the outer sheet 2 is formed by laminating a base material layer, an adhesive layer, and a resin layer in order from the outer surface. Paper is used as the base material layer. Dry laminates, extruded laminates, etc., are used as adhesive layers. Polypropylene (PP), polyethylene (PE), etc., are used as resin layers. As an example, the base layer has a basis weight of 9 g / m². 2 More than 21g / m 2 The following paper is used, with a dry laminate adhesive layer and a biaxially oriented polypropylene (OPP) resin layer. Note that "sheet" is a concept that includes film, not defined by thickness (the same applies hereafter).

[0024] The inner sheet 3, like the outer sheet 2, has a rectangular shape (or rectangular shape) large enough to wrap food when folded in half along its length. The inner sheet 3 is a heat-sealable plastic sheet (film) such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET). For example, the inner sheet 3 is a mat-treated biaxially oriented polypropylene (OPP) sheet (film) or an unoriented polypropylene (CPP) sheet (film). Alternatively, the inner sheet 3 is a laminated sheet (film). As one form of a laminated sheet (film), the inner sheet 3 is formed by laminating a base layer, an adhesive layer, and a resin layer in order from the outer surface. As the base layer, resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE) are used. As the adhesive layer, dry lamination, extruded lamination, etc., are used. As the resin layer, resins such as polypropylene (PP) and polyethylene (PE) are used. Furthermore, the term "polypropylene sheet (film)" encompasses not only 100% pure polypropylene sheets (films), but also sheets (films) that primarily consist of polypropylene but also contain other components (such as polyethylene or other resin components).

[0025] The inner sheet 3 comprises a pair of inner sheet pieces (a first inner sheet piece 30 and a second inner sheet piece 31). The first inner sheet piece 30 has a rectangular shape that is long in the width direction. The first inner sheet piece 30 is positioned on one side of the outer sheet 2 in the longitudinal direction (in this embodiment, the upper side when the food packaging material 1 is viewed from the front (outside) with one end 10a at the top and the other end 10b at the bottom). The second inner sheet piece 31 has a rectangular shape that is long in the width direction. The second inner sheet piece 31 is positioned on the other side of the outer sheet 2 in the longitudinal direction (in this embodiment, the lower side when the food packaging material 1 is viewed from the front (outside)).

[0026] An overlapping portion 32 is formed by overlapping the inner portion of the first inner sheet piece 30 with the inner portion of the second inner sheet piece 31. The overlapping portion 32 is formed over the entire area between both side edges of the inner sheet 3. In this embodiment, the inner portion of the first inner sheet piece 30 is overlapped on the inner portion (outer surface) of the second inner sheet piece 31. As a result, the inner portion of the second inner sheet piece 31 is in contact with the sheet-like food 4, while the inner portion of the first inner sheet piece 30 does not come into contact with the sheet-like food 4 because the inner portion of the second inner sheet piece 31 is interposed between it and the sheet-like food 4. In this embodiment, the overlapping portion 32 is located in the center of the inner sheet 3 in the longitudinal direction.

[0027] A sealing portion 33 is formed in the overlapping portion 32 along the width direction of the inner sheet 3. The sealing portion 33 seals the overlapping portion 32 and blocks communication between the inside and outside of the food packaging material 1 through the overlapping portion 32. The sealing portion 33 is a joint formed by welding the first inner sheet piece 30 and the second inner sheet piece 31. In this embodiment, the sealing portion 33 is a strip-shaped seal that is narrower in width than the end joint portion 11 and the side joint portion 12.

[0028] The sealing portion 33 is a weak bond that will not peel off with a small force, but can be peeled off if a person applies a force greater than a certain amount. In this embodiment, a coating agent (partial coating agent) such as a heat-sensitive adhesive is applied to at least one of the outer surface of the inner part of the second inner sheet piece 31 or the inner surface of the inner part of the first inner sheet piece 30, and since the bonding strength (heat seal strength) of the coating agent is not strong, the sealing portion 33 is a weak bond (weak seal).

[0029] The sealing portion 33 is formed along the inner edge of the first inner sheet piece 30. However, the sealing portion 33 is formed inward from the inner edge of the first inner sheet piece 30. As a result, the area from the inner edge of the first inner sheet piece 30 to the sealing portion 33 becomes a non-jointed free piece 30a. The free piece 30a serves as a gripping piece when peeling the first inner sheet piece 30 from the outer sheet 2 during opening.

[0030] The end joint 11 is formed by welding the outer sheet 2 and the inner sheet 3 along one end 10a and the other end 10b of the outer sheet 2 and the inner sheet 3. However, the central part of one end 10a and the other end 10b of the outer sheet 2 and the inner sheet 3 (the area that will become the ear piece 10d described later) is an unwelded, unjointed portion 11a. The side joint 12 is formed by welding the outer sheet 2 and the inner sheet 3 along the side edges of the outer sheet 2 and the inner sheet 3. The interior of the main body 10 constructed in this way becomes the storage area for the sheet-like food 4. In this embodiment, the end joint 11 and the side joint 12 are strip-shaped seals having a predetermined width.

[0031] The end joint 11 and the side joint 12 are weakly joined and will not peel off with a small force, but can be peeled off if a person applies a force greater than a certain amount. In this embodiment, a coating agent (partial coating agent) such as a heat-sensitive adhesive is applied to at least one of the inner surfaces of at least the outer periphery of the inner sheet 3 or at least one of the inner surfaces of at least the outer periphery of the outer sheet 2, and since the bonding strength (heat seal strength) of the coating agent is not strong, the end joint 11 and the side joint 12 are weakly joined (weakly sealed).

[0032] Restricting portions 13 are formed inside the end joints 11 and side joints 12, and close to the outer edges of one end edge, the other end edge, and both side edges of the sheet-like food 4. Since the sheet-like food 4 is smaller in both length and width than the storage area for the sheet-like food 4 inside the main body 10, it may move around inside if left as is. The restricting portions 13 restrict the movement of the sheet-like food 4 in the longitudinal and width directions. This ensures that the sheet-like food 4 is positioned correctly within the main body 10. The restricting portions 13 are joints formed by welding the outer sheet 2 and the inner sheet 3. In this embodiment, the restricting portions 13 are narrow, strip-shaped seals. Alternatively, the restricting portions 13 may be point seals. Alternatively, the restricting portions 13 may be seals that protrude from the inner edges of the end joints 11 and side joints 12.

[0033] The restricting portion 13 is a weak bond that will not peel off with a small force, but can be peeled off if a person applies a force greater than a certain amount. In this embodiment, a coating agent (partial coating agent) such as a heat-sensitive adhesive is applied to at least one of the inner surfaces of the inner sheet 3 or the outer sheet 2, and since the bonding strength (heat seal strength) of the coating agent is not strong, the restricting portion 13 is a weak bond (weak seal).

[0034] The method of packaging food using the food packaging material 1 is as follows. First, as shown in Figure 4(a), the food 5 is placed on the inner sheet 3 of the food packaging material 1. At this time, the food 5 is placed on either the first inner sheet piece 30 or the second inner sheet piece 31, and is positioned so that one corner (vertex corner) of the food 5 faces either the one end 10a side or the other end 10b side of the food packaging material 1. The width of the food 5 is approximately the same as the width of the sheet-shaped food 4.

[0035] Next, as shown in Figure 4(b), the food packaging material 1 is folded in half lengthwise so that one end 10a and the other end 10b meet, and the folded portion is folded to follow the side (triangular slope) of the food 5. As a result, the half of the food packaging material 1 on the lengthwise side 10a covers the back of the food 5, and the half on the other end 10b covers the front of the food 5, while the sheet pieces 10c, 10c on both sides (left and right) of the food packaging material 1 are left over with the positions of the one end 10a and the other end 10b offset. Even if there is air inside the container of the sheet-like food 4, the air is pushed out when the food packaging material 1 is folded and escapes to the outside from the unjointed portion 11a.

[0036] Therefore, as shown in Figure 4(c), one of the extra sheet pieces 10c on either side is folded so that it overlaps the portion of the food packaging material 1 that covers the front of the food 5, and then, as shown in Figure 5(a), the other extra sheet piece 10c is folded so that it overlaps the first one.

[0037] Then, as shown in Figure 5(b), a label 7 is affixed on top of this, spanning the folded extra sheet pieces 10c, 10c on both sides. Label 7 is a product display label that has the product name, contents (ingredients) of the rice ball, price, product image, etc. printed on the outer surface of the label base material and is affixed to the part that will be the front when displayed in the store.

[0038] Here, as shown in Figure 6, ear pieces 10d are formed at each corner of the triangular shape. The ear pieces 10d are portions where an excess sheet is folded around the axis in the protruding direction. Because they are folded, there is basically no opening. However, a sealing portion 14 is formed at least at the ear pieces 10d at the apex corners. The sealing portion 14 is formed by welding the ear pieces 10d along the width direction intersecting the protruding direction of the ear pieces 10d. In this embodiment, the sealing portion 14 is a strip-shaped seal having a predetermined width. With the formation of the sealing portion 14, an additional joint portion 11b is formed at the unjointed portion 11a of the end joint portion 11 to seal the unjointed portion 11a (see Figure 8(a)), and the container portion for the sheet-like food 4 is completely sealed.

[0039] The sealing portion 14 and the additional joint portion 11b are weakly joined and will not peel off with a small force, but can be peeled off if a person applies a force greater than a certain amount. In this embodiment, a coating agent (partial coating agent) such as a heat-sensitive adhesive is applied to the relevant area, and since the bonding strength (heat seal strength) of the coating agent is not strong, the sealing portion 14 and the additional joint portion 11b are weakly joined (weakly sealed).

[0040] However, at least one ear piece 10d (at least one of the left and right ear pieces 10d, 10d located at the base) is not sealed, and the inside of this ear piece 10d is in communication with the inside and outside of the food packaging 6. Therefore, when heating the food 5 inside using a microwave oven before opening the food packaging 6, the generated steam is discharged to the outside through this ear piece 10d. Note that "not sealed" includes forms in which a sealing portion is formed on the ear piece 10d, but a part of the sealing portion is an unjointed, communicating portion, meaning it is not completely sealed.

[0041] After the above steps, the food packaging 6 is completed. As shown in Figure 6(a), the label 7 comprises a label body 7a and a tab 7b. The label body 7a is the part of the label substrate that has an adhesive layer or bonding layer on its inner surface. As a result, the label 7 is detachably attached by adhesive or bonding to the part of the food packaging material 1 that covers the front of the food 5. The tab 7b is the part of the label substrate that does not have an adhesive layer or bonding layer on its inner surface. The label 7 can be peeled off by pinching the tab 7b and pulling it. In this embodiment, the label 7 has a trapezoidal shape that fits within the triangular shape on the front of the food packaging 6.

[0042] A first opening operation indicator section 8a is provided on the outer surface of the tab portion 7b. The first opening operation indicator section 8a displays the content of the first operation (first opening operation) when opening the food packaging 6, and can take various forms such as printing or label application. In this embodiment, the first opening operation indicator section 8a is formed by printing on the outer surface of a label substrate.

[0043] As shown in Figure 6(b), a label 9 is attached to the back of the food packaging 6. The label 9 is a quality label with product information such as the product name, ingredients, expiration date, and manufacturer printed on the outer surface of the label base material.

[0044] The method for opening the food packaging 6 is as follows. First, following the instructions on the first opening operation indicator 8a, pinch the tab 7b of the label 7 and pull the tab 7b to peel the label 7 from the food packaging 6. Then, the excess sheet pieces 10c, 10c on both sides that have been folded are not fixed to the part of the food packaging material 1 that covers the front of the food 5, so as shown in Figure 7(a), they open to a certain extent due to the reaction force. At this time, the outer surface of the part of the food packaging material 1 that covers the front of the food 5 is provided with a second opening operation and subsequent operation indicator 8b (see also Figure 2), which is exposed when the label 7 is peeled off. As shown in Figure 7(b), the second opening operation and subsequent operation indicator 8b displays instructions for opening operations, including the second operation (second opening operation), when opening the food packaging 6, and can take various forms such as printing or label application. In this embodiment, the second opening operation and subsequent operation indicator 8b is formed by printing on the outer surface of the outer sheet 2.

[0045] From the second opening operation onward, the process can be easily understood by checking the information displayed on the display section 8b. As the second opening operation, as shown in Figure 8(a), the food packaging material 1 is unfolded and the food 5 is placed on the second inner sheet piece 31. Next, as the third opening operation, the free piece 30a of the first inner sheet piece 30 is grasped and pulled to peel the first inner sheet piece 30 from the outer sheet 2, as shown in Figure 8(b). This exposes half of the sheet-like food 4.

[0046] Next, as the fourth opening operation, as shown in Figure 9(a), the food 5 is transferred onto the exposed sheet-like food 4. Next, as the fifth opening operation, the inner part of the second inner sheet piece 31 is grasped and pulled to peel the second inner sheet piece 31 from the outer sheet 2. As a result, as shown in Figure 9(b), the outer sheet 2 from which the inner sheet 3 has been removed can be used as a sheet to prevent hands from getting dirty, and the food 5, which has been integrated with the sheet-like food 4, can be eaten.

[0047] As described above, according to this embodiment, the outer sheet 2 is made of a sheet with higher rigidity than the inner sheet 3. Specifically, the outer sheet 2 is made of a different material that is harder than the inner sheet 3, or a different material or the same material that is thicker than the inner sheet 3, thereby making it a sheet with higher rigidity than the inner sheet 3. For this reason, according to this embodiment, the food retention performance of the outer sheet 2 when opened can be improved.

[0048] Furthermore, according to this embodiment, the central part of the longitudinal end of the food packaging material 1 does not have an end joint 11 formed thereon, and is an unjointed portion 11a that connects the inside and outside of the food packaging material 1. As a result, even if there is air inside the container for the sheet-shaped food 4, the air is pushed out when the food packaging material 1 is folded and escapes to the outside through the unjointed portion 11a. Therefore, according to this embodiment, it is possible to prevent the problem of difficulty in packaging the food 5 due to bulging caused by air inside the container.

[0049] Furthermore, according to this embodiment, not only the side joint 12 but also the end joint 11 (including the additional joint 11b formed to seal the unjointed portion 11a) is peelable. Therefore, according to this embodiment, when the outer sheet 2 is used as a sheet to prevent hands from getting dirty after opening, the inner sheet 3 is prevented from hanging down from the edge of the outer sheet 2 and getting in the way. In addition, when disposing of the product, it becomes easy to separate and dispose of the outer sheet 2 and the inner sheet 3, which are made of different materials.

[0050] Furthermore, according to this embodiment, a restricting portion 13 is provided. Therefore, according to this embodiment, it is possible to prevent the sheet-like food 4 from moving within the storage portion and the positional relationship between the food 5 and the sheet-like food 4 from shifting. Moreover, according to this embodiment, the restricting portion 13 is removable. Therefore, according to this embodiment, the inner sheet pieces 30 and 31 can be easily peeled off and removed without the restricting portion 13 acting as resistance.

[0051] Furthermore, according to this embodiment, in addition to the end joint portion 11 and the side joint portion 12, a sealing portion 33 is provided. Then, a sealing portion 14 is formed later on the unjointed portion 11a of the end joint portion 11, and an additional joint portion 11b is formed. Therefore, according to this embodiment, the inside of the container for the sheet-like food 4 can be made airtight, and the sheet-like food 4 can be effectively prevented from becoming damp.

[0052] Moreover, according to this embodiment, the sealing portion 33 is a strip-shaped joint that is narrower than the side joint portion 12. When peeling off the first inner sheet piece 30, a force is applied to the sealing portion 33 in a direction perpendicular to it. If the width of the sealing portion 33 is wide, a large force will be required, and then the load will decrease rapidly after the sealing portion 33 is peeled off. In that case, it is conceivable that the food 5 may fall out of the food packaging material 1 with this force and become inedible. However, according to this embodiment, such an unforeseen situation can be prevented.

[0053] Furthermore, according to this embodiment, a paper sheet is used for the outer sheet 2. Therefore, according to this embodiment, the amount of plastic used can be reduced. In recent years, plastic waste has become a global environmental problem, but according to this embodiment, it is an effective measure against this environmental problem.

[0054] Furthermore, according to this embodiment, a first opening operation indicator section 8a and a second opening operation and subsequent operation indicator section 8b are provided to assist in the opening operation. Therefore, according to this embodiment, the opening operation can be properly understood and performed appropriately. Moreover, according to this embodiment, the second opening operation and subsequent operation indicator section 8b is hidden from view when the food packaging is in its original state. Therefore, according to this embodiment, the aesthetic appearance of the product can be improved.

[0055] Furthermore, according to this embodiment, at least one tab 10d of the food packaging 6 is not sealed, and the inside of this tab 10d is in communication with the outside of the food packaging 6. Therefore, according to this embodiment, when heating the food 5 inside using a microwave oven, the generated steam can be suitably discharged and released to the outside.

[0056] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0057] In the above embodiment, a paper sheet is used for the outer sheet 2 as a sheet with higher rigidity than the inner sheet 3. However, the present invention is not limited to this. In short, any type of sheet can be used as long as it has high rigidity, such as a sheet of a different material that is harder than the inner sheet, or a sheet of a different material or the same material that is thicker than the inner sheet.

[0058] Furthermore, in the above embodiment, both the end joint 11 and the side joint 12 are detachable. However, the present invention is not limited thereto. While it is essential that the side joint be detachable, it is not essential that the end joint (and additional joint) be detachable.

[0059] Furthermore, in the above embodiment, the restricting portion 13 is provided to restrict the movement of the sheet-like food 4 in both the longitudinal and width directions. However, the present invention is not limited thereto. For example, if the end joint or side joint is located near the outer edge of the sheet-like food, a restricting portion in that direction is unnecessary.

[0060] Furthermore, in the above embodiment, a sealing portion 33 is provided at the overlapping portion 32 of the inner sheet 3. However, the present invention is not limited thereto. If there is no problem with the airtightness of the storage portion of the sheet-like food 4, the sealing portion of the overlapping portion is not essential.

[0061] Furthermore, in the above embodiment, an unjointed portion 11a is provided at the end portion 11, and a sealing portion 14 is later formed on the unjointed portion 11a, and an additional joint portion 11b is formed. However, the present invention is not limited thereto. If there is no problem with the bendability of the food packaging material 1 during packaging, an unjointed portion is not essential. Even if an unjointed portion is provided, it may be only at one end, rather than both ends in the longitudinal direction of the food packaging material. Also, if there is no problem with the airtightness of the portion containing the sheet-like food 4, an additional joint portion is not essential.

[0062] Furthermore, in the above embodiment, the food packaging material 1 is used for triangular packaging. However, the present invention is not limited thereto. For example, it may be used for square packaging of food by folding it in half lengthwise with food in between, overlapping the excess sheet pieces on both sides to form a bag, and sealing the opening.

[0063] Furthermore, in the above embodiment, the food is a triangular rice ball (processed rice food), and the sheet-like food is nori seaweed. However, the food to be packaged may be any processed rice food other than rice balls (for example, pilaf, fried rice, sushi, etc.) or any food other than processed rice food (for example, Japanese sweets such as manju, Western sweets such as cakes, bread, sandwiches, hamburgers, etc.), as long as it is in a shape that can be wrapped in food packaging material, and the type of food is not particularly limited. Similarly, the sheet-like food may be any sheet-like kelp, dried sardines, etc., as long as it is in a shape that can be accommodated in the flat storage section of the food packaging material, and the type of sheet-like food is not particularly limited.

[0064] Furthermore, the shape of the food to be packaged is not particularly limited. For example, the front is not triangular, but may be a flat column with a circular or square front. It may also be block-shaped. It may also be spherical or have a continuous curved surface. These are just examples; the point is that any shape that can be wrapped in food packaging material is acceptable.

[0065] Furthermore, terms that specify shapes, parts, states, or directions, such as "triangular," "rectangular," "trapezoidal," "center," "center," "end," "side," "same," "orthogonal," "up and down," and "left and right," in this invention include not only the term itself but also the concept of "abbreviation," meaning something similar or alike. [Explanation of Symbols]

[0066] 1...Food packaging material, 10...Main body, 10a...One end, 10b...Other end, 10c...Extra sheet piece, 10d...Legging piece, 11...End joint, 11a...Unjoined part, 11b...Additional joint, 12...Side joint, 13...Restriction part, 14...Sealing part, 2...Outer sheet, 3...Inner sheet, 30...First inner sheet piece, 30a...Free piece, 31...Second inner sheet piece, 32...Overlapping part, 33...Sealing part, 4...Sheet-shaped food, 5...Food (triangular rice ball), 6...Food packaging body, 7...Label, 7a...Label body, 7b...Tap part, 8a...First opening operation indicator part, 8b...Second opening operation and subsequent indicator part, 9...Label

Claims

1. Food packaging material comprising an outer sheet having a shape elongated in a first direction, and an inner sheet consisting of a first inner sheet piece and a second inner sheet piece that are superimposed on the outer sheet with a sheet-like food sandwiched in between, and having overlapping portions on their inner parts along a second direction perpendicular to the first direction, wherein the outer sheet and the inner sheet are joined so as to surround the sheet-like food by an end joint between the outer sheet and the first inner sheet piece at one end in the first direction, an end joint between the outer sheet and the second inner sheet piece at the other end in the first direction, peelable side joints between the outer sheet and the first inner sheet piece on both sides in the second direction, and peelable side joints between the outer sheet and the second inner sheet piece on both sides in the second direction, The outer sheet uses a sheet with higher rigidity than the inner sheet. Food packaging materials.

2. The side joints between the outer sheet and the first inner sheet piece and the side joints between the outer sheet and the second inner sheet piece are provided in a removable manner in order to allow the sheet-like food to be exposed on the outer sheet and integrated with the food. Food packaging material according to claim 1.

3. The outer sheet functions as a sheet to prevent hands from getting dirty on integrated food products and sheet-shaped food products. Food packaging material according to claim 2.

4. The central part of the end in the first direction is an unjointed area where no end joint has been formed. Food packaging material according to any one of claims 1 to 3.

5. When food is packaged to form a food package, an additional joint is formed to seal the unjointed portion. Food packaging material according to claim 4.

6. The end joints can also be peeled off. Food packaging material according to any one of claims 1 to 3.

7. The sheet-like food has a shape in which at least one of its length in the first direction or width in the second direction is smaller than the portion of the sheet-like food that is contained within the end joint and the inner edge of the side joint. Within the containment section, a restricting section is formed near the outer edge of the sheet-like food, where the outer sheet and the inner sheet are joined together to restrict the movement of the sheet-like food. The regulated section can also be peeled off. Food packaging material according to any one of claims 1 to 3.

8. The restricting portion is formed separately from the end joint and the side joint. Food packaging material according to claim 7.

9. In the overlapping portion of the inner sheets, a sealing portion is formed in a location inside the inner edge of the first inner sheet piece, along the second direction, where the first inner sheet piece and the second inner sheet piece are joined to seal the overlapping portion. The sealed portion can also be peeled off. Food packaging material according to any one of claims 1 to 3.

10. The sealing portion is narrower than the side joint portion. Food packaging material according to claim 9.

11. Paper sheets are used for the outer covering. Food packaging material according to any one of claims 1 to 3.

12. The food packaging material according to any one of claims 1 to 3 is folded in half in a first direction with the food in between, and the excess sheet pieces on both sides of the food packaging material are folded so that they overlap the portion of the food packaging material that covers the front of the food, thereby packaging the food in a triangular shape. The label is affixed to the portion of the food packaging that covers the front of the food, and spans the folded excess sheet pieces on both sides. Food packaging.

13. The outer surface of the label is provided with a first opening operation indicator section that indicates that the first operation when opening the food packaging is to peel off the label. On the outer surface of the portion of the food packaging that covers the front of the food, a section is provided that displays instructions for subsequent opening operations, including the second opening operation, which is the second operation when opening the food packaging. This section is hidden by the folded excess sheet pieces or labels on both sides until the first opening operation is performed. The food packaging according to claim 12.

14. At each corner of the triangular shape, flattened ear-shaped pieces are formed by overlapping excess sheets of food packaging material. At least one earlobe is not sealed. The food packaging according to claim 12.

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