Food packaging bags

Abstract

To provide a food packaging bag which can close and seal an opening part by neatly folding a superfluous sheet piece on an opening part side after food is stored inside a bag body, when packaging food.SOLUTION: A food packaging bag 1 is configured to: include a bag body 10 in which, sheets 2, 3 in a pair having a shape in which, compared with one end side in a first direction, the other end side is wider, are overlapped one another, and three sides are sealed by a top part joint part 11 on the one end side and side part joint parts 12,12 on both side parts, with the other end side being an opening part 13; and package food 6 having a three-dimensional shape with both side surfaces being triangular-shaped. In this food packaging bag 1, in the case where a laminate sheet is used in an end part region on the opening part 13 side of the sheets 2, 3, an edge part of the laminate sheet is a non-joint part 23d in which sheets 23a, 23c of the laminate sheet are not joined with each other.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a food packaging device for packaging food. In the bag Regarding. [Background technology]

[0002] Some foods, such as sandwiches, have triangular (usually right-angled) sides and a three-dimensional shape (a triangular prism lying on its side) with a certain width. A typical food packaging bag for packaging such foods is shown in Figure 10, and a newer one is known, such as that described in Patent Document 1.

[0003] The food packaging bag 1' comprises a bag body 10' and a header portion 15'. The bag body 10' is made by overlapping a pair of sheets 2', 3', each of which has a shape in which one end is wider than the other end, and is sealed on three sides by a top joint portion 11' at one end and side joint portions 12', 12' on both side edges, with the other end forming an opening 13'. The header portion 15' is made by joining the protruding pieces of the sheets 2', 3' protruding from the top joint portion 11' at appropriate locations and integrating them.

[0004] The second sheet 3' in the header portion 15' has an inverted U-shaped cut line 32', for example, and a tear strip 33' with the cut line 32' as its outline. A tear strip 34' such as cutting tape is joined to the inner surface of the second sheet 3' from the tear strip 33' to the other end of the second sheet 3'.

[0005] Methods for packaging food are described in, for example, Patent Document 2 and Patent Document 3. The outline of the method is as follows. First, as shown in Figure 11(a), air at a predetermined pressure is blown into the bag body 10' from the opening 13' using a blower (not shown), or a suction head (not shown) is used to suck and lift the opening 13' side of the first sheet 2', thereby opening the opening 13'. Then, in this state, the food 6' is placed into the bag body 10' from the apex side.

[0006] When the food 6' is placed inside the bag body 10', the opening shape of the opening 13' becomes rectangular, as shown in Figure 1(b). The portions of the first sheet 2' and the second sheet 3' that span the side joint portions 12' form a pair of opposing triangular side portions. The middle portion of the first sheet 2' forms a rectangular front portion. The middle portion of the second sheet 3' forms a rectangular back portion.

[0007] After the food 6' is placed in the bag body 10', first, as shown in FIG. 12(c), of the excess sheet pieces on the opening 13' side extending from the outer edge of the bottom surface 60' of the food 6' in a rectangular tubular shape from the outer edge of the bottom surface 60', the sheet piece of the second sheet 3' (the sheet piece at the back) is folded along the bottom surface 60' of the food 6'. Next, as shown in FIG. 12(a), one of the left and right sheet pieces (the sheet piece at one of the side surfaces) is folded so as to overlap the previously folded sheet piece. Next, as shown in FIG. 12(b), the other of the left and right sheet pieces (the sheet piece at the other side surface) is folded so as to overlap the previously folded sheet piece. Next, as shown in FIG. 12(c), the remaining sheet piece of the first sheet 2' (the sheet piece at the front) is folded so as to overlap the previously folded sheet piece. This closes the opening 13' of the food packaging bag 1'. Once the opening 13' is closed, tape 8' is applied to seal the opening 13'. Alternatively, a label may be applied, or the folded and overlapping sheet pieces may be joined at predetermined locations by welding or the like to seal the opening 13'. Through the above steps, the food package is completed. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2017-171326 [Patent Document 2] Japanese Patent Application Laid-Open No. 2003-226307 [Patent Document 3] Japanese Patent Application Laid-Open No. 2002-179173 Summary of the Invention [Problem to be solved by the invention]

[0009] However, when laminated sheets, such as laminated sheets of sheets of different materials or thicknesses, are used for the first sheet 2' and / or the second sheet 3', the sheet pieces, especially the edges, tend to curl inward or outward. In this case, the sheet pieces cannot be properly aligned with the bottom surface 60' of the food 6', making it difficult to achieve a clean bottom finish for the food package. If the bottom of the food package is not clean, the appearance of the food package deteriorates and its commercial value is diminished. To prevent this, manual correction is required, which is time-consuming. Alternatively, if correction is difficult, the product may be discarded.

[0010] Therefore, the present invention has been made in consideration of such circumstances, and its object is to provide a food packaging bag that, when packaging food, allows the excess sheet piece on the opening side to be neatly folded over after the food has been placed inside the bag body, thereby closing and sealing the opening. [Means for solving the problem]

[0012] The food packaging bag according to the present invention comprises: A food packaging bag for packaging a three-dimensional food product having triangular side surfaces and a predetermined width, the bag comprising a pair of overlapping sheets each having a shape in which one end is wider than the other end in a first direction, the bag body being sealed on three sides by a top joint at one end and side joints at both sides, and the other end being an opening, At least one of the pair of sheets In the edge region of the opening side of the sheet, Across the entire width in a second direction perpendicular to the first direction, Laminated sheets are used R, The edges of the laminated sheet are Across the entire width in the second direction, There are non-jointed sections where the sheets of the laminated sheet are not joined together. It is a food packaging bag.

[0013] Here, as one embodiment of the food packaging bag according to the present invention, The laminated sheet is a laminated sheet in which an outer sheet and an inner sheet are laminated with an adhesive layer between them, and the edge line of the adhesive layer is offset inward from the edge lines of both sheets, forming a non-jointed portion. The above configuration can be adopted.

[0014] In another aspect of the food packaging bag according to the present invention, At least one of the pair of sheets has an end region on the opening side, In the end region, a laminated sheet having non-jointed edges, such as a laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet, is used. The above configuration can be adopted.

[0015] In addition, as another aspect of the food packaging bag according to the present invention, At least one of the pair of seats is partitioned into a middle section and a lower section, A plastic sheet is used in the middle section, and a laminated sheet with non-jointed edges is used in the lower section, and a laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet is used. The above configuration can be adopted.

[0016] In addition, as yet another aspect of the food packaging bag according to the present invention, A pair of seats Either In the area of ​​one of the sheets that becomes an excess sheet piece on the opening side when the food is placed inside the bag body, a reinforcing sheet is added to the area sandwiched between two valley fold lines that correspond to both side edges of the bottom surface of the food, with side edges that coincide with or are along each valley fold line. The above configuration can be adopted.

[0017] Also, in this case, The sheet to which the reinforcing sheet is added is partitioned into an edge region on the opening side and an adjacent region adjacent to the edge region, A laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet is used in the adjacent region, and a plastic sheet is used in the end region; The extra sheet piece to which the reinforcing sheet is added is composed of a base made of laminated sheet in the adjacent area and a plastic sheet in the end area. The above configuration can be adopted.

[0018] or, The sheet to which the reinforcing sheet is added is divided into a middle section and a lower section, A laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet is used in the middle section, and a plastic sheet is used in the lower section, The extra sheet piece to which the reinforcing sheet is added is composed of the laminated sheet in the middle section at the base and the plastic sheet in the lower section at the end. The above configuration can be adopted. [Effects of the Invention]

[0021] According to the food packaging bag of the present invention, when packaging food, after the food is placed in the bag body, the excess sheet piece on the opening side extending from the outer edge of the bottom of the food is folded up appropriately. However, if a laminated sheet is used in the edge region on the opening side of the sheets constituting the bag body, the edges of the sheet piece are not joined together, meaning that the sheets of the laminated sheet are not joined together. This makes the sheet piece, particularly the edges, less likely to curl and maintain its flatness. Therefore, according to the food packaging bag of the present invention, when packaging food, the excess sheet piece on the opening side can be neatly folded up after the food is placed in the bag body to close and seal the opening, resulting in a neatly finished bottom of the food package.

[0022] Furthermore, in the food packaging bag according to the present invention, when a reinforcing sheet is added to the area of ​​the sheet piece corresponding to the bottom surface of the food, this area has higher rigidity than other areas. As a result, the sheet piece is folded so as to properly fit the bottom surface of the food. Therefore, with the food packaging bag according to the present invention, when packaging food, the excess sheet piece on the opening side after the food is placed inside the bag body can be neatly folded to close and seal the opening, resulting in a neatly finished bottom of the food package. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is an exploded perspective view of a food packaging bag according to one embodiment of the present invention. [Figure 2] FIG. 2 is a front view of the food packaging bag. [Figure 3] FIG. 3 is a rear view of the food packaging bag. [Figure 4] Fig. 4(a) is a front view of the first sheet of the food packaging bag, Fig. 4(b) is a cross-sectional view taken along line AA in Fig. 4(a), and Fig. 4(c) is an enlarged view of the lower end portion of the divided sheet in Fig. 4(b). [Figure 5] Fig. 5(a) is a front view of the second sheet of the food packaging bag, and Fig. 5(b) is a cross-sectional view taken along line BB in Fig. 5(a). [Figure 6] 6(a) and (b) are explanatory views of the process of closing and sealing the opening of the food packaging bag after the food has been placed in the bag. [Figure 7] Fig. 7(a) is a perspective view of a food package in which food is packaged in a food packaging bag, as seen from the front side, and Fig. 7(b) is a perspective view of the food package, as seen from the back side. [Figure 8] FIG. 8 is an explanatory diagram of the manufacturing process of the food packaging bag, and is an explanatory diagram of the manufacturing process of the first sheet material (and the second sheet material). [Figure 9] FIG. 9 is an explanatory diagram of the manufacturing process for food packaging bags, illustrating each step from overlapping the first sheet material and the second sheet material to the final completion of the food packaging bag. [Figure 10]FIG. 10 is a rear view of a conventional food packaging bag. [Figure 11] 11(a) to 11(c) are explanatory diagrams showing the process of packaging food using a food packaging bag. [Figure 12] 12(a) to 12(d) are explanatory diagrams continuing from FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, a food packaging bag used for packaging sandwiches will be described as one embodiment of the food packaging bag according to the present invention with reference to Figs. 1 to 9.

[0026] As shown in Figures 1 to 3, the food packaging bag 1 comprises a bag body 10 and a header portion 15. The bag body 10 is formed by overlapping and joining a pair of sheets (a first sheet 2 and a second sheet 3). The first sheet 2 is also called the front sheet, and the second sheet 3 is also called the back sheet. The pair of sheets are shaped so that one end is longer than the other in mutually orthogonal directions, and the other end is wider than the other end. The bag body 10 is joined and sealed on three sides by a top joint portion 11 at one end and side joint portions 12, 12 on both sides, and the other end forms an opening 13. The header portion 15 is formed by joining the protruding pieces of the sheets 2, 3 protruding from the top joint portion 11 at appropriate locations to form an integrated body. In the following, the one of the directions (the up-down direction in Figures 2 and 3) will be referred to as the "longitudinal direction" or "first direction," and the other of the directions (the left-right direction in Figures 2 and 3) will be referred to as the "width direction" or "second direction."

[0027] The first sheet 2 has a body portion 20 and a tip portion 21 (the protruding piece). The body portion 20 has a shape that gradually widens from one end to the other end. The tip portion 21 has a narrow shape that extends from one end of the body portion 20.

[0028] The second sheet 3 includes a body portion 30 and a tip portion 31 (the protruding piece). The body portion 30 has a shape that gradually widens from one end to the other. The tip portion 31 has a narrow shape that extends from one end of the body portion 30.

[0029] The body portions 20, 30 are trapezoidal. Therefore, one end of the body portions 20, 30 (and the other end of the tip portions 21, 31 that coincide therewith) is linear and perpendicular to the longitudinal direction. In other words, one end of the body portions 20, 30 is linear and parallel to the width direction. Both side edges of the body portions 20, 30 are linear and inclined with respect to the longitudinal direction. However, the other end sides of both side edges of the body portions 20, 30 are missing due to the cutouts 14. As a result, the other end sides of the body portions 20, 30 are narrower by the amount of the cutouts 14.

[0030] As also shown in Fig. 4, the first sheet 2 is divided into a plurality of regions in the longitudinal direction. Specifically, the first sheet 2 is divided into three regions: an upper section 22A, a middle section 22B, and a lower section 22C. The upper section 22A is divided into the upper portion and the tip section 21 of the body section 20. The lower section 22C is divided into the lower portion of the body section 20. The middle section 22B is divided between the upper section 22A and the lower section 22C, i.e., into the middle portion of the body section 20. The upper section 22A and the lower section 22C have the same height dimension.

[0031] The first sheet 2 is made into a single sheet by overlapping three sheets (a middle separate sheet 23 and upper and lower end separate sheets 23, 23) at their edges (overlapped portion 24) and joining the overlapped portion 24 along the width direction of the first sheet 2 (jointed portion 25). In this embodiment, the jointed portion 25 is a strip-shaped seal having a predetermined width, formed by welding using a heating bar or a heating roller. At the overlapped portion 24, the edge of the end separate sheet 23 is positioned on the outer surface of the edge of the middle separate sheet 23, and the edge of the middle separate sheet 23 and the edge of the end separate sheet 23 are overlapped so that the outer surface of the edge of the middle separate sheet 23 faces the inner surface of the edge of the end separate sheet 23.

[0032] The intermediate divided sheet 23 is a heat-sealable plastic sheet (film) made of polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or the like. For example, the sheet is a biaxially oriented polypropylene (OPP) sheet (film) or a solid polypropylene (CPP) sheet (film). Alternatively, the sheet is a laminated sheet (film). As one form of laminated sheet (film), the sheet is formed by laminating, from the outer surface side, a base layer, an adhesive layer, and a resin layer. Resins such as polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE) are used for the base layer. Dry lamination, extrusion lamination, and the like are used for the adhesive layer. Resins such as polypropylene (PP) and polyethylene (PE) are used for the resin layer. The term "polypropylene sheet (film)" not only refers to 100% pure polypropylene sheets (films), but also includes sheets (films) that contain polypropylene as the main component and other components (e.g., 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 hereinafter).

[0033] In contrast, the upper and lower end divided sheets 23, 23 are sheets (films) made of paper, unbleached kraft paper, Japanese paper, mixed paper, synthetic paper, glassine paper, paper-like or paper-like materials (collectively referred to as "paper"), or primarily made of these materials (collectively referred to as "paper sheets" (films"). The paper may be paper containing bio-based polyethylene terephthalate (bio-based PET, so-called bio-PET). The sheet is a laminated sheet (film) in which paper 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, from the outer surface side, a base layer, an adhesive layer, and a resin layer. 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 12 g / m. 2 About 15g / m 2The adhesive layer is a dry laminate, and the resin layer is biaxially oriented polypropylene (OPP).

[0034] Alternatively, the upper and lower end divided sheets 23, 23 are sheets (films) made of ordinary cellophane, moisture-proof cellophane, cellophane-based material, or cellophane-like material (collectively referred to as "cellophane"), or primarily made of these (collectively referred to as "cellophane sheet" (film)). 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, from the outer surface side, a base layer, an adhesive layer, and a resin layer. 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 dry lamination, and the resin layer is biaxially oriented polypropylene (OPP).

[0035] Upper portion 22A corresponds to the upper end portion of separate sheet 23. Middle portion 22B corresponds to the portion of intermediate separate sheet 23 excluding the upper and lower overlapping portions 24, 24. Lower portion 22C corresponds to the lower end portion of separate sheet 23. As a result, in first sheet 2, upper portion 22A and lower portion 22C are opaque (or translucent) portions, and middle portion 22B is a transparent portion that allows the interior to be seen.

[0036] Here, the lower segment sheet 23 is a sheet in the edge region that serves as a free end. As described above, it is a laminated sheet formed by laminating a paper sheet on the outer surface and a plastic sheet on the inner surface with an adhesive layer between them, or a laminated sheet formed by laminating a cellophane sheet on the outer surface and a plastic sheet on the inner surface with an adhesive layer between them. In this case, as shown in FIG. 4(c), the edge line of adhesive layer 23b is offset inward from the edge lines of outer sheet 23a and inner sheet 23c, and adhesive layer 23b is not present at the edge of the laminated sheet. Furthermore, without adhesive layer 23b, sheets 23a and 23c are not bonded (adhered) to each other. Therefore, the edge of the laminated sheet is a non-bonded portion 23d (strip-like along the edge line of the laminated sheet) where sheets 23a and 23c are not bonded to each other. As a result, at non-bonded portion 23d, sheets 23a and 23c become free strips along their edge lines that are not constrained by each other. The width of non-bonded portion 23d, i.e., the distance between the edge lines of sheets 23a and 23c and the edge line of adhesive layer 23b, is preferably 5 mm or more, or 10 mm or more, and 40 mm or less, or 30 mm or less, or 20 mm or less.

[0037] As shown in FIG. 5, the second sheet 3 is divided into multiple regions in the longitudinal direction. Specifically, the second sheet 3 is divided into three regions: an upper section 35A, a middle section 35B, and a lower section 35C. The upper section 35A is defined in the tip section 31. The lower section 35C is defined in the lower section of the body section 30. The middle section 35B is defined between the upper section 35A and the lower section 35C, i.e., the section excluding the lower section of the body section 30. The middle section 35B has a height dimension greater than the middle section 22B of the first sheet 2. The upper section 35A and the lower section 35C have the same height dimension. The upper section 35A and the lower section 35C have a height dimension smaller than the upper section 22A and the lower section 22C of the first sheet 2.

[0038] The second sheet 3 is formed by overlapping three sheets (a middle separate sheet 36 and upper and lower end separate sheets 36, 36) at their edges (overlapped portion 37) and joining the overlapped portion 37 along the width direction of the second sheet 3 (jointed portion 38) to form a single sheet. In this embodiment, the jointed portion 38 is a strip-shaped seal having a predetermined width, formed by welding using a heating bar or a heating roller. At the overlapped portion 37, the edge of the end separate sheet 36 is positioned on the inner side of the edge of the middle separate sheet 36, and the edge of the middle separate sheet 36 and the edge of the end separate sheet 36 are overlapped such that the inner surface of the edge of the middle separate sheet 36 faces the outer surface of the edge of the end separate sheet 36.

[0039] The middle divided sheet 36 is a paper sheet or a cellophane sheet, while the upper and lower divided sheets 36, 36 are plastic sheets.

[0040] Upper portion 35A corresponds to the portion of upper end separate sheet 36 excluding overlapping portion 37. Middle portion 35B corresponds to the middle separate sheet 36. Lower portion 35C corresponds to the portion of lower end separate sheet 36 excluding overlapping portion 37. As a result, in second sheet 3, upper portion 35A and lower portion 35C are transparent portions, and middle portion 35B is an opaque (or translucent) portion.

[0041] The top joint 11 is formed by welding the sheets 2 and 3 along one end of the body portions 20 and 30. In this embodiment, the top joint 11 is formed by welding using a heating bar and is a strip-shaped seal having a predetermined width.

[0042] The side joints 12 are formed by welding the sheets 2 and 3 along the side edges (hypotenuses) of the body portions 20 and 30 and the side edges (hypotenuses) of the tip portions 21 and 31. In this embodiment, the side joints 12 are formed by welding using a heating bar and are strip-shaped seals having a predetermined width. The width of the side joints 12 is smaller than the width of the top joint 11. Specifically, the side joints 12 have a width of 2 mm or more, more preferably 3 mm or more, and 5 mm or less, more preferably 4 mm or less.

[0043] The interior of the bag body 10 constructed in this manner serves as a food storage area. An inner sheet 4 is attached to the inner surface of the first sheet 2 in the bag body 10. The other end of the inner sheet 4 is joined at two points using a point seal or the like (joint 40), and one end is a free end. This allows the inner sheet 4 to adhere to the surface of the food and follow its movement even if the food moves within the storage area. Therefore, the first sheet 2 does not get dirty and its appearance is not damaged.

[0044] A cut line 32 is formed in the second sheet 3 in the header portion 15. The cut line 32 may be a full cut line, a half cut line (half cut), a perforation, or the like. The cut line 32 is formed to extend to the edge of the middle separate sheet 36. Therefore, the portion of the cut line 32 formed on the edge of the middle separate sheet 36 functions as an easily breakable portion of the middle separate sheet 36. The formation of the cut line 32 also forms a tear strip 33 in the second sheet 3 in the header portion 15. The tear strip 33 has the cut line 32 as its outline, a fixed end between both end points, and a free end at one end. In this embodiment, the cut line 32 is formed in an inverted U shape. This makes the tear strip 33 an upward tongue.

[0045] The second sheet 3 is provided with a tearing strip 34 as an opening means. The tearing strip 34 is provided on the inner surface of the second sheet 3, extending from the tear piece 33 to the other end of the second sheet 3. The tearing strip 34 is provided, for example, in the center of the width of the second sheet 3 along the longitudinal direction. The tearing strip 34 is joined to the inner surface of the second sheet 3 by welding, adhesive, or the like. As an example, the tearing strip 34 is joined to the inner surface of the second sheet 3 by thermal adhesion or self-adhesion after a coating agent is applied to this inner surface (the surface facing the second sheet 3). The tearing strip 34 is, for example, cutting tape or thread, etc., strong enough to break the second sheet 3. In this embodiment, the tearing strip 34 is a strip of cutting tape having a width of 5 mm or more, or 10 mm or more. Cut tape is made by cutting thin strips of heat-weldable plastic sheets such as biaxially oriented polyester, polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), and biaxially oriented polypropylene (OPP).

[0046] As shown in FIGS. 3 and 6, the food packaging bag 1 includes a reinforcing sheet 5. The reinforcing sheet 5 is attached to a region of the second sheet 3 that will become an excess sheet piece on the opening 13 side when the food 6 is contained in the bag body 10, and that is sandwiched between two valley fold lines L3, L3 corresponding to both side edges 60b, 60b of the bottom surface 60 of the food 6. In this embodiment, the reinforcing sheet 5 has adhesive or adhesive properties on its inner surface and is attached to the outer surface (of the middle section 35B) of the second sheet 3. Alternatively, if the reinforcing sheet 5 has thermal welding properties on its inner surface, it may be joined to the outer surface of the second sheet 3 by welding. Alternatively, the reinforcing sheet 5 may be attached to the inner surface of the second sheet 3.

[0047] The reinforcing sheet 5 is a paper sheet or a plastic sheet. However, the reinforcing sheet 5 is not the thin sheet that constitutes the sheets 2 and 3, but is a thick sheet that is more rigid (harder) than the sheets 2 and 3. The thickness of the paper sheet of the sheets 2 and 3 is 25 to 60 μm, and the thickness of the plastic sheet of the sheets 2 and 3 is 15 to 40 μm, whereas the thickness of the reinforcing sheet 5 is 50 to 150 μm. As an example, the reinforcing sheet 5 is made of a label base material used for labels.

[0048] The reinforcing sheet 5 has a rectangular shape with a first edge 5a, left and right side edges 5b, 5b, and a second edge 5c. More specifically, the second edge 5c is longer than the first edge 5a, and accordingly the left and right side edges 5b, 5b are oblique sides whose spacing becomes wider from the first edge 5a to the second edge 5c. Therefore, the reinforcing sheet 5 has an isosceles trapezoidal shape. Alternatively, the reinforcing sheet 5 may have a horizontally long rectangular shape with the first edge and second edge having the same length.

[0049] The first edge 5a is located inside the mountain fold line L2 of the second sheet 3 that corresponds to the rear edge 60a of the bottom surface 60 of the food product 6 and is aligned with the mountain fold line L2. Alternatively, the first edge 5a may coincide with the mountain fold line L2. The side edge 5b is located inside the valley fold line L3 of the second sheet 3 that corresponds to the side edge 60b of the bottom surface 60 of the food product 6 and is aligned with the valley fold line L3. Alternatively, the side edge 5b may coincide with the valley fold line L3. The second edge 5c is located inside the boundary line 35bc between the middle and lower portions 35B and 35C of the second sheet 3 and is aligned with the boundary line 35bc.

[0050] The two valley fold lines L3, L3 bulge in width at the middle, and the corresponding side edges 5b, 5b become oblique sides because the bottom surface 60 of the food product 6 has a shape that bulges in width at the middle due to the thickness of the ingredients in the food product 6. Alternatively, if the ingredients in the food product 6 are not very thick and the bottom surface 60 of the food product 6 is rectangular, the two valley fold lines L3, L3 become extensions of the two mountain fold lines L1, L1 that correspond to the intersection lines between the back surface and side surfaces of the food product 6, and become parallel lines, the reinforcing sheet 5 may be a horizontally long rectangle with both side edges 5b, 5b becoming vertical sides.

[0051] The tear strip 34 is disposed on the inner surface of the reinforcing sheet 5. Therefore, an easily breakable portion 50 is formed at the edge portion of the reinforcing sheet 5 corresponding to the first edge 5a. The easily breakable portion 50 is a plurality of cut lines arranged in parallel along the edge portion. Alternatively, the easily breakable portion 50 may be a pair of cut lines or a pair of notches cut over a predetermined length from the first edge 5a toward the second edge 5c at a position sandwiching the tear strip 34. Alternatively, the easily breakable portion 50 may be a group of fine scratches formed along the edge portion.

[0052] The method for packaging food 6 using food packaging bag 1 is as explained in the Background Art section. First, opening 13 is opened, and food 6 is placed into bag body 10 from the apex side, after which the excess sheet piece on the opening 13 side extending in a rectangular cylindrical shape from the outer edge of bottom surface 60 of food 6 is folded appropriately.

[0053] As shown in FIG. 6( a), when packaging the food 6, the reinforcing sheet 5 is placed in the area of ​​the excess sheet piece of the second sheet 3 (the sheet piece that is first folded to fit along the bottom surface 60 of the food 6) that corresponds to the bottom surface 60 of the food 6. This makes this area more rigid than other areas. The first edge 5 a of the reinforcing sheet 5 is aligned with or coincides with the mountain fold line L2 of the second sheet 3, and the side edges 5 b, 5 b of the reinforcing sheet 5 are aligned with or coincide with the two valley fold lines L3, L3 of the second sheet 3. These edge effects make it easier for the excess sheet piece of the second sheet 3 to fold along the mountain fold line L2 and the two valley fold lines L3, L3. As a result, the excess sheet piece of the second sheet 3 is folded correctly to fit along the bottom surface 60 of the food 6.

[0054] 6(b), after the excess sheet piece of the second sheet 3 is folded, the overlapping portion between the folded sheet piece and the unfolded sheet piece can be smoothly and reliably joined at the portions along the two valley fold lines L3, L3 of the second sheet 3 and the portion along the valley fold line L4 of the second sheet 3 that corresponds to the front edge 60c of the bottom surface 60 of the food product 6 (joints 16, 16, 17). At this stage, the formation of joints 16, 16, 17 ensures that the opening 13 is sufficiently sealed.

[0055] The reinforcing sheet 5 does not extend into the lower portion 35C of the second sheet 3 and is not large enough for the second edge 5c to be aligned with or coincide with the valley fold line L4 of the second sheet 3. The reinforcing sheet 5 is not provided for the lower portion 35C for the following reasons: i) the lower portion 35C is a plastic sheet, which has lower rigidity (is softer) than paper sheets or cellophane sheets and is therefore easily valley-folded without the edge action of the reinforcing sheet 5; and ii) plastic sheets are less likely to curl and therefore require less correction by the reinforcing sheet 5.

[0056] When the excess sheet piece of the second sheet 3 is folded, the excess sheet piece of the first sheet 2 mainly extends from the outer edge of the bottom surface 60 of the food product 6. The edge of this excess sheet piece forms a strip along the edge line of the sheet piece, forming a non-jointed portion where the sheets of the laminated sheet are not joined together. This makes this excess sheet piece, especially the edge, less likely to curl and maintains its flatness. Therefore, when folding the remaining excess sheet pieces, the curls do not interfere with the folding process and make it difficult to fold them.

[0057] Once all the excess sheet pieces have been folded, the opening 13 is closed and sealed, completing the food package 7 as shown in Figure 7. The food package 7 is maintained in an airtight state by sealing the top joint 11, the side joints 12, 12, and the opening 13. This prevents outside air from entering the inside, and the intended quality of the packaged food 6 is maintained.

[0058] When eating the food 6, the opening strip 33 is picked up and pulled down. The opening strip 33 is joined to one end of the opening strip 34. Therefore, when the opening strip 33 is picked up and pulled down, the opening strip 34 is pulled, and the second sheet 3 is torn along both side edges of the opening strip 34, forming a tearable open portion in the second sheet 3. The food 6 can be taken out from this tearable open portion.

[0059] The method for manufacturing the food packaging bag 1 is as follows: The food packaging bag 1 is manufactured through a step (first step) of manufacturing a first sheet material 2X having a continuous first sheet 2 as shown in Fig. 8, a step (second step) of manufacturing a second sheet material 3X having a continuous second sheet 3 as shown in Fig. 8, and a step (third step) of manufacturing the food packaging bag 1 from the first sheet material 2X and the second sheet material 3X as shown in Fig. 9.

[0060] As shown in FIG. 8, in the first step, two sheet raw rolls are rotatably held: one roll of divided sheet raw 23X, in which a middle divided sheet 23 is continuously wound, and the other roll of divided sheet raw 23X, in which an end divided sheet 23 is continuously wound. The pair of end divided sheet raw 23X, 23X have the same width. Each end divided sheet raw 23X has a non-jointed portion 23d on its outer side edge (the side edge opposite the side edge that overlaps with the side edge of the middle divided sheet raw 23X). The middle divided sheet raw 23X and the pair of end divided sheet raw 23X, 23X are fed from the respective sheet raw rolls. A pair of end divided sheet raw materials 23X, 23X are supplied sandwiching the middle divided sheet raw material 23X, and each side edge of the middle divided sheet raw material 23X is overlapped with the side edge of the end divided sheet raw material 23X (overlapping portion 24), and the overlapping portion 24 is joined to form a single sheet raw material.

[0061] As shown in FIG. 8, in the second step, two separate sheet rolls are rotatably supported: one roll of a divided sheet roll 36X, in which a continuous middle divided sheet 36 is wound, and the other roll of a divided sheet roll 36X, in which a continuous end divided sheet 36 is wound. The pair of end divided sheet rolls 36X, 36X have the same width. The middle divided sheet roll 36X and the pair of end divided sheet rolls 36X, 36X are fed from the respective sheet rolls. The pair of end divided sheet rolls 36X, 36X are fed so as to sandwich the middle divided sheet roll 36X therebetween, and the side edges of the middle divided sheet roll 36X and the side edges of the end divided sheet roll 36X are overlapped (overlapped portion 37), and the overlapped portion 37 is joined to form a single sheet roll.

[0062] The sheet raw rolls 2X and 3X are thus manufactured. After being wound into a roll, the roll is set in a bag-making device, or the sheet raw rolls 2X and 3X are manufactured by the bag-making device and then continue to be transported, and then proceed to the third process.

[0063] As shown in Figure 9, the third step involves overlapping a first sheet raw material 2X to which an inner sheet 4 has been joined and a second sheet raw material 3X to which a cut line 32 has been formed and an opening strip 34 has been joined, with their inner surfaces facing each other, and transporting them intermittently in this state, and includes: i) a step of forming a top joint 11 (step 3-1), ii) a step of forming a side joint 12 (step 3-2, which may be performed simultaneously with step 3-1), iii) a step of cutting and dividing the side joint 12 along the midline of the side joint 12 to individually separate the food packaging bag 1 (step 3-3), and iv) a step of forming a cutout 14 (step 3-4).

[0064] Due to their shape, this type of trapezoidal food packaging bags 1 are manufactured so that they are oriented transversely to the conveyance direction of the sheet webs 2X, 3X and so that their orientations alternate. That is, food packaging bags 1 having an opening 13 on one side in the width direction (TD) perpendicular to the conveyance direction (MD) of the sheet webs 2X, 3X and a header portion 15 on the other side in the width direction, and food packaging bags 1 having an opening 13 on the other side in the width direction and a header portion 15 on one side in the width direction, are manufactured alternately. In Figure 9, the configuration of the former food packaging bag 1 is indicated by the letter "A" after the reference numeral, and the configuration of the latter food packaging bag 1 is indicated by the letter "B" after the reference numeral.

[0065] Therefore, in adjacent food packaging bags 1, 1, i) the middle separate sheet 23 relating to the middle section 22B of the first sheet 2 of one food packaging bag 1 and the middle separate sheet 23 relating to the middle section 22B of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (middle separate sheet raw material 23X), and ii) the end separate sheet 23 relating to the upper section 22A of the first sheet 2 of one food packaging bag 1 and the end separate sheet 23 relating to the lower section 22C of the first sheet 2 of the other food packaging bag 1 are made of the same sheet (end separate sheet raw material 23X), iii) the middle divided sheet 36 relating to the middle portion 35B of the second sheet 3 of one food packaging bag 1 and the middle divided sheet 36 relating to the middle portion 35B of the second sheet 3 of the other food packaging bag 1 are made of the same sheet (middle divided sheet original roll 36X), and iv) the end divided sheet 36 relating to the upper portion 35A of the second sheet 3 of one food packaging bag 1 and the end divided sheet 36 relating to the lower portion 35C of the second sheet 3 of the other food packaging bag 1 are made of the same sheet (end divided sheet original roll 36X).

[0066] The overall flow of the third step is generally the same as that described in Japanese Patent Application Laid-Open No. 2005-219319. However, in this patent document, the side joints are formed by fusion cutting. In contrast, in this embodiment, the side joints 12 are formed by welding and cutting. For welding, a heated bar having a width equal to the width of the side joints 12, 12 of adjacent food packaging bags 1, 1, i.e., twice the width of the side joints 12, is used. For cutting, a Thomson blade is used. Note that steps 3-3 and 3-4 may be performed simultaneously by punching out the food packaging bag 1 using a full-circumference Thomson blade.

[0067] As shown in Fig. 9, the reinforcing sheet 5 is added in the third step of the manufacturing method of the food packaging bag 1. That is, the third step additionally includes a step (step 3-0) of adhering the reinforcing sheet 5 to the outer surface of the second sheet 3X. Step 3-0 may be performed before step 3-1 or step 3-2, simultaneously with step 3-1 or step 3-2, or after step 3-1 or step 3-2. Alternatively, step 3-0 may be performed after step 3-4.

[0068] As described above, in the food packaging bag 1 according to this embodiment, the reinforcing sheet 5 is added to the area of ​​the excess sheet piece of the second sheet 3 that is folded first, which corresponds to the bottom surface 60 of the food 6, making this area more rigid than other areas. As a result, the excess sheet piece of the second sheet 3 is folded so that it properly fits along the bottom surface 60 of the food 6. Therefore, in packaging the food packaging bag 1 according to this embodiment, after the food 6 has been placed in the bag body 10, the excess sheet piece on the opening 13 side can be neatly folded to close and seal the opening 13, allowing the bottom of the food package 7 to be neatly finished.

[0069] Furthermore, in the food packaging bag 1 according to this embodiment, the edge of the excess sheet piece of the first sheet 2, which is to be folded next, forms a non-jointed portion 23d where the sheets of the laminated sheet are not joined together. Laminated sheets, such as laminated sheets of sheets of different materials or sheets of different thicknesses, are prone to curling due to shrinkage and distortion when they are processed and dried using heat or other methods. Furthermore, laminated sheets of paper sheets are prone to absorbing moisture, which can lead to curling. Therefore, by providing a non-jointed portion 23d on the edge of the laminated sheet, the excess sheet piece of the first sheet 2, particularly the edge, is less likely to curl, maintaining its flatness. Therefore, in the food packaging bag 1 according to this embodiment, when packaging food 6, the excess sheet piece on the opening 13 side after the food 6 is placed in the bag body 10 can be neatly folded to close and seal the opening 13, resulting in a neatly finished bottom of the food package 7.

[0070] Furthermore, in the food packaging bag 1 according to this embodiment, a paper sheet or cellophane sheet is used for part of the sheets 2 and 3. Paper sheets and cellophane sheets are more susceptible to creases than plastic sheets. As a result, the sheets 2 and 3 are folded sharply at each side of the food package 7, giving the food package 7 a sharp appearance. Therefore, the food packaging bag 1 according to this embodiment has the effect of providing the food package 7 with excellent appearance, stability, and therefore excellent self-standing ability.

[0071] Furthermore, paper sheets and cellophane sheets are more rigid (harder) than plastic sheets. This provides stiffness to sheets 2 and 3, which has the effect of improving the self-standing ability of food packaging 7. The stiffness of sheets 2 and 3 also improves the stiffness of food packaging 7. Therefore, food packaging bag 1 according to this embodiment is highly effective in preventing food 6 from losing its shape.

[0072] Furthermore, the food packaging bag 1 according to this embodiment uses a paper sheet or cellophane sheet, which allows for a reduction in the amount of plastic used. In recent years, waste plastic has become a global environmental problem, and the food packaging bag 1 according to this example is an effective solution to this environmental problem.

[0073] Furthermore, in the food packaging bag 1 according to this embodiment, the upper section 22A of the first sheet 2 is defined as the upper section and header section 15 of the bag body 10, and the lower section 22C is defined as the lower section of the bag body 10. As a result, in the state where the food is packaged as a food package 7, the upper and lower sections of the upright food 6 are hidden by the opaque upper section 22A and lower section 22C, and only the center of the food 6 is visible through the transparent middle section 22B. In other words, only the center section of the food 6, which looks the most delicious, is visible and emphasized. Therefore, the food packaging bag 1 according to this embodiment can stimulate the consumer's desire to purchase the food in the state where the food is packaged as a food package 7.

[0074] Furthermore, in the food packaging bag 1 according to this embodiment, the side joint portions 12 are formed in a strip shape with a predetermined width along the side edges of the bag body 10 and the header portion 15. As a result, in the state where the food package 7 is formed, the side joint portions 12 are in a folded-back state as shown in FIG. 7. As a result, the header portion 15 is in an upright state because pillars are formed on both sides. Moreover, the header portion 15 is in a flat state extending straight from the front portion of the bag body 10. Therefore, the food packaging bag 1 according to this embodiment can improve the appearance in the state where the food package 7 is formed, and can make the markings on the header portion 15 easier to see when the food package 7 is displayed in a store such as a convenience store.

[0075] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0076] In the above embodiment, the end of the excess sheet piece of the second sheet 3 (corresponding to the lower portion 35C of the second sheet 3) is a plastic sheet. This has the effect of making the end of the sheet piece less likely to curl, as described above. However, the food packaging bag according to the present invention is not limited to this. The end of the excess sheet piece of the second sheet may be a laminated sheet of paper sheets or cellophane sheets. In this case, it is preferable that the edge of this laminated sheet be a non-jointed portion.

[0077] In the above embodiment, each of the pair of sheets 2 and 3 is divided into multiple regions in the first direction, and each region is selectively filled with either a plastic sheet, a paper sheet, or a cellophane sheet. However, the food packaging bag according to the present invention is not limited to this. For example, at least one of the pair of sheets may be a single sheet that is not divided into multiple regions and is selectively filled with either a plastic sheet, a paper sheet, or a cellophane sheet.

[0078] In the above embodiment, a plastic sheet, a paper sheet, or a cellophane sheet is selectively used. However, the food packaging bag according to the present invention is not limited to this. A nonwoven fabric may also be used as the sheet.

[0079] In the above embodiment, the non-jointed portion 23d is provided on the edge of the laminated sheet of paper sheets or cellophane sheets. However, the food packaging bag according to the present invention is not limited to this. For example, even in the case of a laminated sheet of plastic sheets, curling may occur due to differences in thickness, so a non-jointed portion may also be provided on the edge of such a laminated sheet.

[0080] In the above embodiment, the laminated sheet is a laminated sheet of two sheets, and the non-jointed portion 23d is a portion where the two sheets are not joined together. However, the present invention is not limited to this. The laminated sheet may be a laminated sheet of three or more sheets, and the non-jointed portion may be a portion where the three or more sheets are not joined together.

[0081] In the above embodiment, the sheet piece that is first folded to fit along the bottom surface 60 of the food 6 is an excess sheet piece of the second sheet 3. However, the food packaging bag according to the present invention is not limited to this. The sheet piece that is first folded may be an excess sheet piece of the first sheet. In this case, the reinforcing sheet is added to the first sheet.

[0082] Furthermore, the header portion is not essential for the food packaging bag. For example, the food packaging bag may have no header portion and may be made up of only the bag body.

[0083] In addition, the food packaging material of the present invention covers all food packaging materials used in various packaging forms, including the food packaging bags of the above-mentioned embodiments, food packaging materials that package rice balls and seaweed sheets separately, food packaging materials for push-up packaging, food packaging materials for pillow packaging, and general bags such as flat bags and gusset bags.

[0084] In the above embodiment, the food is a sandwich, but the type of food to be packaged is not particularly limited, and may be Western confectionery such as cake, Japanese confectionery such as castella, bread, or cooked rice foods such as rice balls, as long as the food can be placed in the food packaging bag.

[0085] Furthermore, in the present invention, terms that specify a shape, part, or state, such as "triangular," "right-angled triangular," "rectangular," "rectangular," "square tube," "trapezoid," "isosceles trapezoid," "straight line," "center," "end," "side," "coincidence," "identical," "parallel," and "orthogonal," include not only the thing itself, but also the concept of "approximately" which means something close to or similar to it. [Explanation of symbols]

[0086] 1...food packaging bag, 10...bag body, 11...top joint, 12...side joint, 13...opening, 14...notch, 15...header, 16...joint, 17...joint, 2...first sheet, 2X...first sheet raw material, 20...body, 21...tip, 22A...upper portion, 22B...middle portion, 22C...lower portion, 23...divided sheet, 23X...divided sheet raw material, 23a... Outer sheet (base layer), 23b... adhesive layer, 23c... inner sheet (resin layer), 23d... non-jointed portion, 24... overlapping portion, 25... joint portion, 3... second sheet, 3X... second sheet roll, 30... body portion, 31... tip portion, 32... cut line, 33... opening piece, 34... opening strip, 35A... upper portion, 35B... middle portion, 35C... lower portion, 35bc... boundary line , 36...divided sheet, 36X...original divided sheet, 37...overlapped portion, 38...joint portion, 4...inner sheet, 40...joint portion, 5...reinforcing sheet, 5a...first edge, 5b...side edge, 5c...second edge, 50...easy-to-tear portion, 6...food (sandwich), 60...bottom surface, 60a...rear edge, 60b...side edge, 60c...front edge, 7...food package, 8...tape, L1...mountain fold line of second sheet 3 corresponding to the intersection line between the back and side of food 6, L2...mountain fold line of second sheet 3 corresponding to the rear edge 60a of bottom surface 60 of food 6, L3...valley fold line of second sheet 3 corresponding to the side edge 60b of bottom surface 60 of food 6, L4...valley fold line of second sheet 3 corresponding to the front edge 60c of bottom surface 60 of food 6, L5...mountain fold line of second sheet 3 to be folded back

Claims

1. A food packaging bag for packaging three-dimensional food products having triangular sides and a predetermined width, the bag body being made of a pair of overlapping sheets each having a shape in which one end is wider than the other end in a first direction, the bag body being sealed on three sides by a top joint at one end and side joints at both sides, and the other end being an opening, A laminated sheet is used in an end region on the opening side of at least one of the pair of sheets over the entire width in a second direction perpendicular to the first direction, and the edge of the laminated sheet forms a non-joined portion where the sheets of the laminated sheet are not joined together over the entire width in the second direction. Food packaging bags.

2. The laminated sheet is a laminated sheet in which an outer sheet and an inner sheet are laminated with an adhesive layer between them, and the edge line of the adhesive layer is offset inward from the edge lines of both sheets, forming a non-jointed portion. The food packaging bag according to claim 1.

3. At least one of the pair of sheets has an end region on the opening side, In the end region, a laminated sheet having non-jointed edges, such as a laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet, is used. The food packaging bag according to claim 1 or 2.

4. At least one of the pair of seats is partitioned into a middle section and a lower section, A plastic sheet is used in the middle section, and a laminated sheet with non-jointed edges is used in the lower section, and a laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet is used. The food packaging bag according to claim 1 or 2.

5. In one of the pair of sheets, a reinforcing sheet having side edges that coincide with or are aligned with the valley fold lines is added to the area sandwiched between two valley fold lines that correspond to both side edges of the bottom surface of the food, in the area that becomes an excess sheet piece on the opening side when the food is contained in the bag body. The food packaging bag according to any one of claims 1 to 4.

6. The sheet to which the reinforcing sheet is added is partitioned into an edge region on the opening side and an adjacent region adjacent to the edge region, A laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet is used in the adjacent region, and a plastic sheet is used in the end region; The extra sheet piece to which the reinforcing sheet is added is composed of a base made of laminated sheet in the adjacent area and a plastic sheet in the end area. The food packaging bag according to claim 5.

7. The sheet to which the reinforcing sheet is added is divided into a middle section and a lower section, A laminated sheet of a paper sheet and a plastic sheet or a laminated sheet of a cellophane sheet and a plastic sheet is used in the middle section, and a plastic sheet is used in the lower section, The extra sheet piece to which the reinforcing sheet is added is composed of the laminated sheet in the middle section at the base and the plastic sheet in the lower section at the end. The food packaging bag according to claim 5.

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