Food packaging material

Abstract

To provide a food packaging material that can effectively prevent sheet-shaped food from breaking due to the frictional resistance it receives from an outer sheet that is removed by sliding off when opened.SOLUTION: An outer sheet 2 comprises a pair of side sheets 21, 21 on both sides of a tear strip 20, each of which has a predetermined distance from the tear strip 20, and has a non-laminated area 2A between a laminated portion of the tear strips 20 and a laminated portion of each side sheet 21 in an inner surface area corresponding to a housing portion of sheet-shaped food 4. This reduces the contact area between the outer sheet 2 and the sheet-shaped food 4, reducing the frictional resistance to the sheet-shaped food 4 and preventing the sheet-shaped food 4 from breaking.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a food packaging material for packaging food. [Background technology]

[0002] Food packaging materials for packaging foods such as triangular rice balls and other cooked rice foods that have a triangular front shape (mainly equilateral triangles) and are finished into a three-dimensional shape of a specified thickness generally comprise an outer sheet with an opening strip running along the longitudinal direction on the inner surface, and an inner sheet that is superimposed on the outer sheet, sandwiching the sheet-like food therebetween, and joined to the outer sheet so as to surround the sheet-like food, and that can be separated in the width direction together with the outer sheet.

[0003] This type of food packaging material is folded in half lengthwise while sandwiching the food, folding the excess sheet pieces on both sides toward the center, and attaching a label on top of the folded pieces to package the food in a triangular shape (so-called triangular packaging, see, for example, Patent Document 1). When eating the food, the free piece at the corner of the food packaging is picked up, pulled to draw the opening strip vertically, and the outer sheet is torn in the lengthwise direction, after which one of the divided packaging pieces is pulled horizontally, and then the other divided packaging piece is pulled horizontally to separate the divided packaging pieces from the food and the sheet-like food. This allows the food to be taken out while still integrated with the sheet-like food. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-215292 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the torn packaging piece is pulled sideways, the outer sheet and the inner sheet slide against the sheet-type food as they are removed. Depending on the strength of pulling, the sheet-type food may be torn. To prevent this, measures are generally taken to reduce the frictional resistance of the inner sheet against the sheet-type food by giving it slipperiness, such as by applying a matte finish to the inner sheet. However, the reality is that no measures have been taken for the outer sheet.

[0006] Therefore, the present invention has been made in consideration of the above circumstances, and its objective is to provide a food packaging material that can effectively prevent sheet-type food from breaking due to the frictional resistance from the outer sheet that is slid away when the material is opened. [Means for solving the problem]

[0007] The food packaging material according to the present invention is A food packaging material comprising an outer sheet having an opening strip on an inner surface along a first direction, and an inner sheet that is overlapped with the outer sheet sandwiching a sheet-type food and joined to the outer sheet so as to surround the sheet-type food, and that is separable together with the outer sheet in a second direction intersecting the first direction, The outer sheet has a pair of side sheets on the inner surface along the first direction on both sides of the opening strip, each of which has a predetermined distance from the opening strip in the second direction, and has a non-laminated area between the laminated part of the opening strip and the laminated part of each side sheet in the area of ​​the inner surface corresponding to the storage part of the sheet-type food. It is a food packaging material.

[0008] As one embodiment of the food packaging material according to the present invention, the opening strip is a pair of opening strips, all or part of which are arranged to have a predetermined distance in the second direction; The outer sheet has a non-laminated region between the laminated portions of the pair of tear strips in the region. The above configuration can be adopted.

[0009] As one embodiment of the food packaging material according to the present invention, The side sheets are strip-shaped sheets whose outer edges are disposed close to or in contact with the boundary line of the region. The above configuration can be adopted.

[0010] As one embodiment of the food packaging material according to the present invention, Each side joint portion of the joint portions between the outer sheet and the inner sheet has at least two protruding joint portions protruding inward from different positions in the first direction, The boundary line is a line in the first direction passing through the tip of the protruding joint. The above configuration can be adopted.

[0011] As one embodiment of the food packaging material according to the present invention, The side sheets are joined to the inner surface of the outer sheet at joints narrower than the side sheets so that the outer and inner edges are non-jointed at a predetermined width. The above configuration can be adopted. Effect of the Invention

[0012] According to the present invention, the frictional resistance to the sheet-type food is reduced by providing a non-laminated region and reducing the contact area between the outer sheet and the sheet-type food or by reducing the contact pressure of the outer sheet against the sheet-type food, and therefore, according to the present invention, it is possible to suitably prevent the sheet-type food from being broken due to the frictional resistance from the outer sheet that slides away when opening the package. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is an exploded perspective view of a food packaging material. [Diagram 2] FIG. 2 is an external view of the food packaging material. [Diagram 3] FIG. 3 is an inside view of the food packaging material. [Figure 4] Fig. 4(a) is a cross-sectional view taken along line AA in Fig. 2. Fig. 4(b) is a partially enlarged cross-sectional view of Fig. 4(a). [Diagram 5] Fig. 5(a) is an enlarged front view of one example of the opening portion, and Fig. 5(b) is an enlarged front view of another example of the opening portion. [Figure 6] Fig. 6(a) is a perspective view of a food package wrapped in food packaging material, as seen obliquely from the front, and Fig. 6(b) is a perspective view of the food package, as seen obliquely from the rear. [Figure 7] 7(a) and (b) are explanatory diagrams showing the process of opening a food package. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Below, as one embodiment of the present invention, we will explain a food packaging material used for so-called triangular packaging, in which food is packaged into triangular rice balls by sandwiching the food and folding it in half lengthwise and folding the excess sheet pieces on both sides toward the center, and a food package in which food is packaged using this food packaging material.

[0015] As shown in Figs. 1 to 3, the food packaging material 1 includes a main body 10. The main body 10 is made of a pair of sheets (an outer sheet 2 and an inner sheet 3) that are stacked with a sheet-like food 4 sandwiched therebetween and joined to surround the sheet-like food 4. The pair of sheets are shaped such that one of the sheets is longer in a direction perpendicular to each other than the other. The sheet-like food 4 is, for example, seaweed that is wrapped around food. The pair of sheets are joined and sealed on all four sides by end joints 11, 11 at one end 10a and the other end 10b, and side joints 12, 12 at both sides. In the following, the one side (the vertical direction in Figs. 2 and 3) is referred to as the "longitudinal direction" or "first direction", and the other side (the horizontal direction in Figs. 2 and 3) is referred to as the "width direction" or "second direction".

[0016] The outer sheet 2 has a rectangular shape (rectangular shape) large enough to enclose food when folded in half in the longitudinal direction. Any of the sheets listed below can be selectively used as the outer sheet 2.

[0017] The sheet is a plastic sheet (film) having heat-welding properties, such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET). As an example, the sheet is a biaxially oriented polypropylene (OPP) sheet (film) or a non-oriented polypropylene (CPP) sheet (film). Alternatively, the sheet is a laminated sheet (film). As one form of the laminated sheet (film), the sheet is formed by laminating a base layer, an adhesive layer, and a resin layer in this order from the outer surface side. As the base layer, resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE) are used. As the adhesive layer, dry lamination, extrusion lamination, and the like are used. As the resin layer, resins such as polypropylene (PP), polyethylene (PE), and the like are used. Note that the polypropylene sheet (film) is a concept that includes not only a polypropylene sheet (film) with a purity of 100%, but also a sheet (film) containing polypropylene as the main component and other components (for example, other resin components such as polyethylene). It should be noted that the term "sheet" is not defined by thickness, but is a concept that includes film (the same applies below).

[0018] The sheet is a sheet (film) of paper, unbleached kraft paper, Japanese paper, mixed paper, synthetic paper, glassine paper, rayon paper, paper-like or paper-like (collectively referred to as "paper"), or mainly made of these (collectively referred to as "paper sheet" (film)). The paper may be paper containing bio-based polyethylene terephthalate (bio-based PET, so-called bio-PET). The sheet has heat-welding properties on at least one of the inner side or outer side entirely or partially at required locations, as necessary. For example, the sheet is a laminated sheet (film) in which paper is laminated as an outer layer and a plastic sheet (film) is laminated as an inner layer. As one form of the laminated sheet (film), the sheet is formed by laminating a base layer, an adhesive layer, and a resin layer in this order from the outer side. Paper is used as the base layer. Dry lamination, extrusion lamination, etc. are used as the adhesive layer. Resins such as polypropylene (PP) and polyethylene (PE) are used as the resin layer. As an example, the base layer has a basis weight of 9 g / m2 More than 21g / m 2 The following is paper, the adhesive layer is a dry laminate, and the resin layer is biaxially oriented polypropylene (OPP).

[0019] The sheet is a sheet (film) made of normal cellophane, moisture-proof cellophane, cellophane-based or cellophane-like (collectively referred to as "cellophane") or mainly made of these (collectively referred to as "cellophane sheet" (film)). The sheet has heat-weldability on at least one of the inner or outer sides entirely or partially at required locations, as necessary. For example, the sheet is a laminated sheet (film) in which cellophane is used as the outer layer and a plastic sheet (film) is used as the inner layer. As one form of laminated sheet (film), the sheet is formed by laminating a base layer, an adhesive layer and a resin layer in this order from the outer side. Cellophane is used as the base layer. Dry lamination, extrusion lamination, etc. are used as the adhesive layer. Resins such as polypropylene (PP) and polyethylene (PE) are used as the resin layer. As an example, the base layer is ordinary cellophane or moisture-proof cellophane, the adhesive layer is a dry laminate, and the resin layer is biaxially oriented polypropylene (OPP).

[0020] A tearing strip 20 is provided on the inner surface of the outer sheet 2 from one end 10a to the other end 10b of the outer sheet 2. The tearing strip 20 is in the shape of a narrow strip or line. The tearing strip 20 tears the outer sheet 2 at a predetermined width, making it possible to separate (divide) the outer sheet 2 in the width direction (left and right). As an example, the tearing strip 20 is disposed in the center of the outer sheet 2 in the width direction.

[0021] The opening strip 20 is joined to the inner surface of the outer sheet 2 by welding, adhesion, etc. As an example, the opening strip 20 is joined to the inner surface of the outer sheet 2 by thermal adhesion or self-adhesion after a coating agent is applied to the inner surface (the surface facing the outer sheet 2).

[0022] A pair of opening strips 20 are provided. The pair of opening strips 20, 20 are arranged at a predetermined interval in the width direction from one end 10a to the other end 10b of the outer sheet 2, and are attached over the entire length of the outer sheet 2. The pair of opening strips 20, 20 are arranged along the longitudinal direction, parallel to each other, and line-symmetrical with respect to the center of the outer sheet 2 in the width direction.

[0023] The opening strip 20 is, for example, a cutting tape or a thread having a strength sufficient to tear the outer sheet 2. As an example, the opening strip 20 is a cutting tape. The cutting tape is a thin cut of a thermally adhesive plastic sheet such as biaxially oriented polyester or polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), or biaxially oriented polypropylene (OPP). The cutting tape 20 has a thickness approximately equal to that of the outer sheet 2 (10 μm or more, or 20 μm or more, and 30 μm or less, or 40 μm or less). The cutting tape 20 has a width of 1 mm or more, or 1.5 mm or more, and 4 mm or less, or 3 mm or less. As an example, the cutting tape 20 has a width of 2 mm.

[0024] A side sheet 21 is provided on the inner surface of the outer sheet 2 from one end 10a to the other end 10b of the outer sheet 2. The side sheet 21 is a strip-shaped sheet having a width greater than the width of the opening strip 20. The side sheet 21 is joined to the inner surface of the outer sheet 2 by welding, adhesion, or the like (joint 22).

[0025] A pair of side sheets 21 are provided. The pair of side sheets 21, 21 are arranged from one end 10a to the other end 10b of the outer sheet 2 with a predetermined gap in the width direction, and are attached to the outer sheet 2 over the entire length. The pair of side sheets 21, 21 are arranged on both sides (in the width direction) of the pair of opening strips 20, 20 with a predetermined gap between them in the width direction. The pair of side sheets 21, 21 are arranged along the longitudinal direction, parallel to each other, and line-symmetrical with respect to the center of the outer sheet 2 in the width direction.

[0026] As for the side sheet 21, like the outer sheet 2, any one of the above-mentioned various sheets is selectively used. As an example, the side sheet 21 is a biaxially oriented polypropylene (OPP) sheet (film) or a non-oriented polypropylene (CPP) sheet (film). The side sheet 21 has a thickness approximately equal to that of the outer sheet 2. The side sheet 21 has a width of 5 mm or more, or 10 mm or more, and 30 mm or less, or 20 mm or less. As an example, the side sheet 21 has a width of 15 mm.

[0027] A cut line 23 is formed in the outer sheet 2 at a predetermined location where the pair of opening strips 20, 20 pass. The cut line 23 is a full cut line. As a result, the pair of opening strips 20, 20 are divided at the location where the cut line 23 passes. The cut line 23 is formed slightly wider than the width of the pair of opening strips 20, 20 at the location where the cut line 23 passes. As an example, the cut line 23 is formed on one end 10a side of the outer sheet 2.

[0028] The cut line 23 has a shape in which both end points point toward the other end 10b of the outer sheet 2. As a result, the cut line 23 forms an outline, the portion between both end points forms a fixed end, the end 10a side of the outer sheet 2 forms a free end, and a free piece 24 is formed that opens to form an opening when bent at the fixed end side.

[0029] A further cut line 23a is formed in addition to the cut line 23. The cut line 23a is a line extending from the cut line 23 to one end 10a of the outer sheet 2 between the pair of opening strips 20, 20. The cut line 23a is a full cut line, a half cut line (half cut), or a perforation.

[0030] A covering piece 5 is provided on the outer surface of the outer sheet 2 as a sealant for covering and sealing the cut lines 23, 23a and the free pieces 24 from the outer surface side of the outer sheet 2, thereby preventing foreign matter, etc. from entering the interior through the cut lines 23, 23a and the free pieces 24.

[0031] The covering piece 5 comprises a main body portion 50 and a gripping portion 51. The main body portion 50 has an adhesive surface that is peelably adhered or bonded to the outer sheet 2. The main body portion 50 is attached to the outer surface of the outer sheet 2 so as to cover the cut line 23, the cut line 23a, and the free piece 24. The gripping portion 51 extends from the main body portion 50. The gripping portion 51 is non-adhesive or non-sticky, and extends from the main body portion 50 toward one end 10a of the outer film 2 to form a free end.

[0032] The inner sheet 3, like the outer sheet 2, has a rectangular shape (rectangular shape) large enough to enclose food when folded in half in the longitudinal direction. As the inner sheet 3, like the outer sheet 2, any one of the above-mentioned various sheets is selectively used. As an example, the inner sheet 3 is a biaxially oriented polypropylene (OPP) sheet (film) that has been matte-treated to impart slip properties.

[0033] 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 (rectangular shape) that is long in the longitudinal direction. The first inner sheet piece 30 is arranged on one side in the width direction of the outer sheet 2. The second inner sheet piece 31 has a rectangular shape (rectangular shape) that is long in the longitudinal direction. The second inner sheet piece 31 is arranged on the other side in the width direction of the outer sheet 2.

[0034] An overlapping portion 32 is formed by overlapping the inner portion of the first inner sheet piece 30 and the inner portion of the second inner sheet piece 31. The overlapping portion 32 is formed over the entire area from one end 10a to the other end 10b of the inner sheet 3. As an example, the overlapping portion 32 is disposed in the center in the width direction of the inner sheet 3, and overlaps with a pair of opening strips 20, 20.

[0035] 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, except for the overlapping portion 32 of the inner sheet pieces 30, 31. 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. As an example, the end joint 11 is a plurality of linear or narrow band-like (multiple strips) joints that extend along one end 10a and the other end 10b, respectively, and are parallel to each other at a predetermined interval in the longitudinal direction of the outer sheet 2 and the inner sheet 3. As an example, the side joint 12 is a band-like joint. The side joint 12 has a communication portion 12a as necessary. The communication portion 12a is a non-joint portion that communicates between the inside and the outside of the main body 10, and is provided in a plurality of portions at appropriate intervals in the longitudinal direction.

[0036] The side joints 12 have protruding joints 12b. The protruding joints 12b are joints that protrude inward, and are provided at appropriate intervals in the longitudinal direction. That is, the side joints 12 have at least two protruding joints 12b, 12b that protrude inward from different positions in the longitudinal direction by the same amount. The protruding joints 12b function as restricting the movement of the sheet-type food 4 in the width direction by abutting the tip of the protruding joint 12b against the side edge of the sheet-type food 4. The innermost end joint 11 functions as a restricting part that restricts the movement of the sheet-type food 4 in the longitudinal direction by abutting the inner edge of the sheet-type food 4. That is, the longitudinal line passing through the tip of the protruding joint 12b and the width line passing through the inner edge of the innermost end joint 11 form a boundary line, and the area surrounded by these boundary lines becomes the storage part for the sheet-type food 4.

[0037] Of both sides of the food packaging material 1 (main body 10), both ends in the longitudinal direction, i.e., the four corners, are formed with cutouts 13. The cutouts 13 are intended to reduce overlap of the sheet pieces when folding the excess sheet pieces on both sides toward the center to form a triangular shape by removing part of the excess sheet pieces on both sides using the food packaging material 1.

[0038] As shown in Fig. 4, the side sheet 21 is a strip-shaped sheet arranged in an area of ​​the inner surface of the outer sheet 2 corresponding to the storage section (hereinafter referred to as "the area"). The outer edge 21a in the width direction of the side sheet 21 is located close to or in contact with the boundary line BL (a longitudinal line passing through the tip of the protruding joint 12b) in the width direction of the area. The inner edge 21b in the width direction of the side sheet 21 is located closer to the opening strip 20 than the outer edge 21a. Note that "close" means that the distance α to the boundary line BL is 10 mm or less (for example, 8 mm, 5 mm, or 3 mm).

[0039] As a result, the outer sheet 2 has a non-laminated region 2A in this region between the laminated portion of the opening strip 20 and the laminated portion of each side sheet 21. Note that, since the pair of opening strips 20, 20 are arranged so that at least a portion of them has a predetermined gap in the width direction, the outer sheet 2 has a non-laminated region 2B in this region between the laminated portions of the pair of opening strips 20, 20.

[0040] The side sheet 21 is joined to the inner surface of the outer sheet 2 by a joining portion 22 narrower than the width of the side sheet 21 so that the outer edge 21a and the inner edge 21b are non-joined at a predetermined width. That is, the joining portion 22 is formed along the outer edge 21a and the inner edge 21b, but is formed at a position inside the outer edge 21a and the inner edge 21b. As a result, the outer edge 21a, the inner edge 21b to the joining portion 22 become a very thin free piece that is a non-joined portion. If no non-joined portion is provided or the width of the free piece is small, there is a concern that the joining means will go beyond the outer edge 21a and the inner edge 21b due to the influence of the precision of the manufacturing device, etc. In this case, there is a concern that the part of the outer sheet 2 that has been overstepped will be thermally damaged and become defective. For this reason, the joining portion 22 is formed narrower than the side sheet 21.

[0041] Fig. 5(a) is one example of the shape of the tearing portion. Fig. 5(b) is another example of the shape of the tearing portion. The distance between the side edge of the covering piece 5 and the end point of the cut line 23 in the width direction must be at least 1 mm (2.5 mm in the illustrated example). The distance between (the side edge of) the opening strip 20 and the end point of the cut line 23 in the width direction must be at least 1 mm (2.5 mm in the illustrated example). The length of the cut line 23a in the longitudinal direction must be at least 1 mm (4 mm or 3 mm in the illustrated example).

[0042] The method for packaging food using the food packaging material 1 is as follows: First, the food is placed on the inner sheet 3 of the food packaging material 1, then the food packaging material 1 is folded in half lengthwise, then one of the excess sheet pieces on either side is folded onto the part of the food packaging material 1 covering the back of the food, then the other excess sheet piece is folded onto that, and finally a label is attached onto that. This completes the food package 7 as shown in Figure 6.

[0043] In addition, in the food package 7, ear pieces 7a are formed at each corner of the triangle. The ear pieces 7a are simply excess sheet pieces folded around the axis in the protruding direction. Since it is folded, basically no openings are formed, but it cannot be denied that an opening may be formed due to insufficient folding or the elastic force of the folded sheet. This causes the inside and outside of the food package 7 to be in communication, leaving room for foreign matter to enter through this. Therefore, a sealing portion 7b may be formed in the ear pieces 7a.

[0044] When eating the food 6, as shown in Fig. 7(a), the gripping portion 51 of the covering piece 5 is gripped and pulled. Then, since the detachable piece 24 is attached to the main body 50 of the covering piece 5, the opening strip 20 attached to the detachable piece 24 is pulled vertically by opening the covering piece 5, and the outer sheet 2 is divided in the longitudinal direction, forming a tearing opening 25 in the outer sheet 2. After the outer sheet 2 is divided by the opening strip 20, as shown in Fig. 7(b), the pair of tearable packaging pieces 70, 71 are pulled up laterally, each centered on the apex corner of the food package 7, so that the uncut portion of the outer sheet 2 is cut with the cut line 23a as the opening starting point, and the food 6 can be taken out in a state where it is integrated with the sheet-like food 4.

[0045] As described above, the food packaging material 1 according to this embodiment reduces frictional resistance to the sheet-type food 4 by providing the non-laminated region 2A and reducing the contact area between the outer sheet 2 and the sheet-type food 4, or by reducing the contact pressure of the outer sheet 2 against the sheet-type food 4. Therefore, the food packaging material 1 according to this embodiment can suitably prevent the sheet-type food 4 from breaking due to frictional resistance from the outer sheet 2 that slides away when opened.

[0046] According to the food packaging material 1 of this embodiment, the pair of opening strips 20, 20 are arranged at least partially with a predetermined gap in the width direction to provide a non-laminated region 2B, which further reduces frictional resistance against the sheet-type food 4. Therefore, according to the food packaging material 1 of this embodiment, the effect of preventing the sheet-type food 4 from breaking can be further improved.

[0047] In the food packaging material 1 according to this embodiment, the side sheets 21 are strip-shaped sheets arranged so that the outer edge 21a is close to or in contact with the boundary line BL of the region. As an example, the boundary line BL is a longitudinal line passing through the tip of the protruding joint 12b. That is, the side sheets 21 do not enter the side joint 12, or do not enter it significantly. Therefore, in the food packaging material 1 according to this embodiment, the number of sheets in the side joint 12 is three, which can suitably prevent a decrease in the joint strength of the side joint 12.

[0048] According to the food packaging material 1 of this embodiment, the joint portion 22 of the side sheet 21 is formed narrower than the side sheet 21. This is done to eliminate the influence of manufacturing errors, as described above. However, if the outer edge 21a becomes a loose piece as a result, when the outer sheet 2 is slid and removed during opening, the outer edge 21a will catch on the sheet-type food 4, causing the sheet-type food 4 to break. However, according to the food packaging material 1 of this embodiment, the outer edge 21a is located close to or in contact with the boundary line BL of the region. That is, the outer edge 21a is located outside the side edge of the sheet-type food 4 in the width direction, or is located inside the side edge of the sheet-type food 4 but close to the side edge. Therefore, according to the food packaging material 1 of this embodiment, when the outer sheet 2 is slid and removed during opening, the outer edge 21a can be suitably prevented from catching on the sheet-type food 4 and causing the sheet-type food 4 to break.

[0049] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0050] In the above embodiment, the side sheets 21 are strip-shaped sheets, but the present invention is not limited to this. The side sheets do not have to be strip-shaped sheets.

[0051] In the above embodiment, the opening strip 20 is two parallel straight lines. However, the present invention is not limited to this. The opening strip may be in various forms, such as a pair of corrugated strips that cross each other, a pair of corrugated strips that do not cross each other, a single straight strip, or a wide strip.

[0052] In the above embodiment, the food packaging material 1 is used for triangular packaging. However, the present invention is not limited to this. For example, the food packaging material may be used for so-called square packaging, in which food is packaged by sandwiching the food and folding it in half in the longitudinal direction, folding excess sheet pieces on both sides to form a bag, and sealing the opening.

[0053] In the above embodiment, the food is a triangular rice ball (a cooked rice food), and the sheet-like food is nori seaweed. However, the food to be packaged may be a cooked rice food other than rice ball (e.g., pilaf, fried rice, sushi, etc.) or a food other than cooked rice food (e.g., Japanese sweets such as buns, Western sweets such as cakes, bread, sandwiches, hamburgers, etc.) as long as it can be wrapped in the food packaging material, and the type of food is not particularly limited. The sheet-like food may also be a sheet-like kelp, a tatami-mat iwashi, etc. as long as it can be stored in the flat storage section of the food packaging material, and the type of sheet-like food is not particularly limited.

[0054] The shape of the food to be packaged is not particularly limited. For example, the food may be a flat column with a circular or rectangular front instead of a triangular front. It may also be block-shaped. It may also be spherical or have a curved surface with a continuous surface. These are merely examples, and the point is that any shape is acceptable as long as the food can be packaged in the food packaging material.

[0055] The sheet (at least one of the outer sheet and the inner sheet) used in the food packaging material is not limited to a single sheet. For example, the sheet may be formed from a plurality of sheets (films), such as two sheets (films) joined at their ends to form a single sheet, or three sheets (films) joined at their ends in sequence to form a single sheet. In this case, the sheets may be made of different materials. For example, the sheet is divided into a plurality of regions in the first direction or the second direction, and a plastic sheet, a paper sheet, or a cellophane sheet is selectively used in each region.

[0056] In the present invention, terms that specify a shape, part, state, or direction, such as "triangular," "rectangular," "rectangular," "straight line," "center," "center," "end," "side," "same," "parallel," "orthogonal," "up and down," "front and back," and "left and right," include not only the term itself, but also the concept of "approximately" which means something close to or similar to it. [Explanation of symbols]

[0057] 1...food packaging material, 10...main body, 10a...one end, 10b...other end, 11...end joint, 12...side joint, 12a...connecting portion, 12b...protruding joint, 13...notch, 2...outer sheet, 2A, 2B...non-laminated area, 20...opening strip, 21...side sheet, 21a...outer edge, 21b...inner edge, 22...joint, 23, 23a...slit line, 24...detached piece, 25...separated opening, 3...inner sheet, 30...first inner sheet piece, 31...second inner sheet piece, 32...overlapped portion, 4...sheet-like food, 5...covering piece, 50...main body, 51...grip portion, 6...food (triangular rice ball), 7...food packaging body, 7a...ear piece, 7b...sealing portion, 70...first divided packaging piece, 71...second divided packaging piece

Claims

1. A food packaging material comprising an outer sheet having an opening strip on an inner surface along a first direction, and an inner sheet that is overlapped with the outer sheet sandwiching a sheet-type food and joined to the outer sheet so as to surround the sheet-type food, and that is separable together with the outer sheet in a second direction intersecting the first direction, The outer sheet has a pair of side sheets on the inner surface along the first direction on both sides of the opening strip, each of which has a predetermined distance from the opening strip in the second direction, and has a non-laminated area between the laminated portion of the opening strip and the laminated portion of each side sheet in an area of ​​the inner surface corresponding to the storage portion of the sheet-type food. Food packaging materials.

2. The opening strip is a pair of opening strips, all or part of which are arranged to have a predetermined distance in the second direction; The outer sheet has a non-laminated region between the laminated portions of the pair of tear strips in the region. The food packaging material according to claim 1.

3. The side sheets are strip-shaped sheets whose outer edges are disposed close to or in contact with the boundary line of the region. The food packaging material according to claim 1.

4. Each side joint portion of the joint portions between the outer sheet and the inner sheet includes at least two protruding joint portions protruding inward from different positions in the first direction, The boundary line is a line in the first direction passing through the tip of the protruding joint. The food packaging material according to claim 3.

5. The side sheets are joined to the inner surface of the outer sheet at joints narrower than the side sheets so that the outer and inner edges are non-jointed at a predetermined width. The food packaging material according to claim 3 or 4.

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