Composite container and sleeve blank material used therefor

Abstract

To provide a composite container comprising a package in which an upper end opening of the package is stably kept wide open and which has front and back films with both side edge parts sealed, and a sleeve provided around the outside of the package.SOLUTION: A sleeve 10 is formed with a folding line 13c extending vertically, and is connected to the left and right side surface panels 12 that can be folded along the folding line and to the left and right side surface panels, and includes the front and back surface panels that are adhered to the front and back films 20A and 20B of the package 20, respectively. At least the upper part of both side end parts of the package is adhered in easily peelable manner, and the front and back films that have peeled off the easy-peeling adhesive part are folded back in opposite directions and hung on the upper edges of the front and back panels, respectively. Tops are formed at the upper edges of the front and back panels, respectively, on which the front and back films are hung.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a composite container and a blank material for a sleeve used therein. [Background technology]

[0002] Patent Document 1 discloses a composite container consisting of an exterior body and an interior bag attached to the inside of the exterior body. When the folded portions formed on both sides of the exterior body are pushed inward, openings are formed at the top and bottom ends of the exterior body. Because the interior bag is attached to the inside of the exterior body, when the top end of the exterior body opens, the top end of the interior bag also opens. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5625408

[0004] In Patent Document 1, the upper end portion of the inner bag is stretched directly above the outer bag. The opening of the inner bag follows the opening of the outer bag. Because the opening of the inner bag follows the opening of the outer bag, if the opening of the inner bag is to be opened wide, it is necessary to design the outer bag so that the opening of the outer bag opens wide. In addition, because the upper end portion of the inner bag located above the outer bag is not attached to the outer bag, it is conceivable that the opening of the inner bag will not be stable if the inner bag is soft. Summary of the Invention [Problem to be solved by the invention]

[0005] The object of this invention is to keep the top opening of the packaging body stably open.

[0006] Another object of the present invention is to keep the top opening of the package wide open. [Means for solving the problem]

[0007] The composite container of this invention comprises a packaging body having a surface film and a back film and sealed at both side edges, and a sleeve that is open at the top and bottom and is provided around the outside of the packaging body, the sleeve having left and right side panels that have folds formed in the direction connecting the top and bottom openings and can be folded along the folds, as well as a front panel and a back panel that are connected to the left and right side panels and are adhered to the surface film and back film of the packaging body, at least the upper parts of the both side edges of the packaging body are easily peeled and the surface and back films have dimensions that allow them to be hung on the upper edges of the front and back panels of the sleeve when the easily peelable adhesive parts at the upper parts of the both side edges are peeled and the surface and back films are folded in opposite directions, and a peak is formed on each of the upper edges of the front and back panels onto which the surface and back films can be hung.

[0008] The composite container of the present invention comprises a packaging body and a sleeve.

[0009] The packaging body has a surface film and a back film, and the contents are stored in the internal space formed between the surface film and the back film. The surface film and the back film may be two separate films, or the double-layered film portion formed by folding a single film may serve as the surface film and the back film, respectively. The packaging body may have a bottom, such as a gusset at the bottom, or it may have no bottom, such as the bottom end of the surface film and the back film bonded (welded) together. In either case, the packaging body constituting the composite container of this invention has sealed side edges, and in particular, at least the upper portions of both side edges are easily peelably bonded. Easy peeling adhesion means that the surface and back films are bonded so that they can be peeled (separated) by applying a light force (pulling in opposite directions), and numerically refers to a strength of 15 N / 15 mm or less. For example, depending on the temperature during heat sealing, only the upper portions of both side edges can be easily peelably bonded, while the remaining portions can be bonded with normal strength.

[0010] The sleeve attached to the outside of the package is cylindrical and has a front panel, a back panel, and left and right side panels, and is open at the top and bottom. The sleeve surrounds (encloses) the package. The front and back films of the package are adhered to the front and back panels (their inner surfaces) of the sleeve, respectively, thereby positioning and fixing the package inside the sleeve.

[0011] The left and right side panels of the sleeve have creases that extend in the direction connecting the top and bottom openings of the sleeve, and the left and right side panels can be folded along these creases. When the left and right side panels are folded by mountain-folding the creases, the front and back panels move closer to each other and the composite container becomes flat. As the packaging body is fixed inside the sleeve as described above, the front and back panels do not become flat, but folding the sleeve makes the composite container compact, making it convenient for transportation, packaging, and display.

[0012] When the folded left and right side panels of the sleeve are pushed toward each other, the sleeve opens up, widening the distance between the front and back panels and creating openings at the top and bottom. An opening is also created at the top for packages in which a surface film is adhered to the front panel and a back film is adhered to the back panel. If the top end of the package is closed (sealed), the top end of the package is opened (torn) before it is opened up.

[0013] By gently folding the creases of the left and right side panels, the left and right side panels will be less likely to return to their folded state, allowing the box to remain stable when opened.

[0014] According to this invention, when the easily peelable adhesive portions at the top of both side edges of the package are peeled off and the front and back films are folded in opposite directions, the front and back films have dimensions that allow them to be hung over the upper edges of the front and back panels of the sleeve, and peaks (protrusions) are formed on the upper edges of the front and back panels to which the front and back films are hung. When the front and back films are locally pressed (supported) from the inside by the peaks formed on the upper edges of the front and back panels, wrinkles are formed in the front and back films inside the sleeve at locations corresponding to the peaks, extending vertically (in the direction connecting the top and bottom openings of the sleeve). This allows the top opening (folded edge) of the package, particularly the portion along the upper edges of the front and back panels, to be stably opened and maintained in a wide state. For example, it is easy to pour hot water into the package.

[0015] In one embodiment, the boundaries between the left and right side panels and the front and rear panels are formed in an outward arc when viewed from the left and right side panels. This makes it easier for the front and rear panels connected to the left and right side panels to curve outward. As described above, the front and rear films of the packaging body are adhered to the front and rear panels, so by curving the front and rear panels outward, the packaging body can be expanded greatly.

[0016] To make it easier to bend the front and back panels outward, folds may be formed on the front and back panels in a direction connecting the upper and lower openings of the sleeve. By forming a pair of outward arc-shaped folds at a distance on the front and back panels, the front and back panels can be bent outward smoothly and effortlessly, allowing the package adhered to the front and back panels to be widely expanded. A linear fold may also be formed between the pair of outward arc-shaped folds, extending in a direction connecting the upper and lower openings of the sleeve. This makes it even easier for the front and back panels to bend outward.

[0017] This invention also provides a blank material for a sleeve that constitutes a composite container. The sleeve material according to this invention comprises a left side panel, a front panel, a right side panel, and a back panel that are connected via folds, and is a blank material for forming a sleeve that is open at the top and bottom by bonding the side portions of the left side panel and the back panel together, with the folds between the left and right side panels and the front and back panels formed in an outward arc when viewed from the left and right side panels, and peaks formed on the upper edges of the front and back panels, respectively.

[0018] According to this invention, the folds between the left and right side panels and the front and back panels are formed in an outward arc when viewed from the left and right side panels, which makes it easier for the front and back panels connected to the left and right side panels to curve outward. Also, because apexes are formed on the upper edges of the front and back panels, when the front and back films constituting the packaging body provided inside the sleeve are folded in opposite directions and hung over the upper edges of the front and back panels, the front and back films are locally pressed (supported) from the inside by the apexes formed on the upper edges of the front and back panels, which forms wrinkles in the front and back films inside the sleeve that extend vertically (in the direction connecting the top and bottom openings of the sleeve), allowing the top opening of the packaging body to be stably maintained wide open.

[0019] In one embodiment, creases are further formed from the lower edge to the upper edge of the left and right side panels for folding the left and right side panels. By mountain-folding the left and right side panels along the creases, the sleeve can be folded when made into a sleeve. Furthermore, by valley-folding the left and right side panels along the creases, it becomes easier to maintain the sleeve in its erected state, and the left and right side panels are less likely to return to their folded state.

[0020] Preferably, the height from the lower edge of the front and rear panels to the top is within 1.3 times the height of the left and right side panels. This prevents the front and back films of the packaging body, which are folded over and hung on the upper edges of the front and rear panels, from floating significantly above the upper edges of the front and rear panels at points other than the top.

[0021] In one embodiment, notches are formed in the upper portions of the front and rear panels. By lightly inserting the front and rear films of the package that are folded over and hung on the upper edges of the front and rear panels, the folded front and rear films can be easily kept in the folded state. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. [Figure 2] FIG. 2 is a front view of a folded composite container. [Figure 3] FIG. 1 is a perspective view of an assembled composite container. [Figure 4] FIG. 2 is a perspective view showing a state in which the upper end opening of the packaging body constituting the composite container is wide open. [Figure 5] FIG. 10 is a development view of a sleeve according to another embodiment. [Figure 6] FIG. 10 is a development view of a sleeve according to yet another embodiment. [Figure 7] FIG. 10 is a development view of a sleeve according to yet another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0023] The composite container according to the present invention will be described in detail below with reference to the drawings.

[0024] Fig. 1 is a development view of the sleeve that constitutes the composite container 1. Fig. 2 is a front view of the composite container 1 in a folded state. Fig. 3 is a perspective view of the composite container 1 in a box-up state with the top end of the packaging body 20 opened. Fig. 4 is a perspective view of the box-up composite container 1, showing the top end opening of the packaging body 20 wide open.

[0025] The composite container 1 is composed of a sleeve 10 and a packaging body 20 .

[0026] Referring to FIG. 1, FIG. 1 is a development view of the cardboard (blank material) forming the sleeve 10 constituting the composite container 1, as seen from the surface that will become the exterior of the sleeve 10. The sleeve 10 is made from a single sheet of cardboard. As will be explained below, the sleeve 10 is erected into a roughly rectangular cylindrical shape with openings at the top and bottom, and includes a front panel 12 and a back panel 14 that face each other at this time, and left and right side panels 11 and 13 that face each other. In FIG. 1, folds (rules) are indicated by dashed and two-dotted lines. The dashed and one-dotted lines 11c, 12a, 12b, 12c, 13c, 14a, 14b, and 14c are folds that facilitate deformation of the erected sleeve 10. The two-dotted lines 11a, 11b, 13a, and 13b are folds that define the boundaries between the front and back panels 12 and 14 and the left and right side panels 11 and 13 when the box is erected. To make deformation and folding easier, fold lines, creases, perforations, half-cuts, etc. are applied along dashed and dotted lines. Cardboard, milk carton paper, plastic sheets, etc. can also be used instead of thick paper.

[0027] The blank material of the sleeve 10 has a left side panel 11, a front panel 12, a right side panel 13, and a back panel 14 arranged side by side. The left and right ends of the blank material are adhered to each other with adhesive N (shown by the dashed lines), thereby forming the sleeve 10 into a cylindrical shape.

[0028] The left side panel 11 is an area sandwiched between folds 11a and 11b. The folds 11a and 11b are formed in an outward arc from the lower edge to the upper edge of the sleeve 10. Between the folds 11a and 11b, at a position equidistant from the folds 11a and 11b, a linear fold 11c is further formed from the lower edge to the upper edge, and the left side panel 11 can be folded along this fold 11c.

[0029] The right side panel 13 has the same configuration as the left side panel 11. That is, the right side panel 13 is an area sandwiched between folds 13a and 13b that are formed in an outward arc and extend from the lower edge to the upper edge of the sleeve 10. In the right side panel 13, a linear fold 13c is also formed between the pair of outward arc folds 13a and 13b and extends from the lower edge to the upper edge, and the right side panel 13 can be folded along this fold 13c.

[0030] The front panel 12 is an area sandwiched between crease 11b and crease 13a. The front panel 12 has outwardly arcuate creases 12a, 12b formed at a distance from each other, and a straight crease 12c located between these creases 12a, 12b and formed at an equal distance from the creases 12a, 12b. Unlike the outwardly arcuate creases 11a, 11b, 13a, 13b that separate the left and right side panels 11, 13, and the straight creases 11c, 13c formed on the left and right side panels 11, 13, the creases 12a to 12c on the front panel 12 do not extend all the way from the lower edge to the upper edge of the front panel 12, but extend partway from the lower edge to the upper edge, and there is a portion at the top of the front panel 12 where the creases 12a to 12c are not formed. The folds 12a to 12c are formed to allow the entire front panel 12 to curve smoothly in the front direction (outward).

[0031] The back panel 14 has a similar configuration to the front panel 12. The back panel 14 is an area of ​​the cylindrically formed sleeve 10 sandwiched between the fold 11a and the fold 13b, and has outwardly arcuate folds 14a, 14b spaced apart, and a linear fold 14c formed equidistant from the folds 14a, 14b between the folds 14a, 14b. The folds 14a to 14c of the back panel 14 are not formed along the entire length from the lower edge to the upper edge of the back panel 14, and there is a portion at the top of the back panel 14 where the folds 14a to 14c are not formed. The folds 14a to 14c allow the entire back panel 14 to be curved smoothly toward the rear.

[0032] The lower edge of the sleeve 10 is formed in a straight line. On the other hand, the upper edge of the sleeve 10 is not in a straight line. To explain in detail, the upper edges of the left and right side panels 11, 13 are formed in a straight line parallel to the lower edge, while the upper edges of the front and back panels 12, 14 are not flat.

[0033] Regarding the front panel 12, oblique sides (diagonal upper edges) extend from the left side panel 11 and the right side panel 13, ascending toward two apexes t1 and t2, which are spaced apart and positioned higher than the upper edges of the left and right side panels 11 and 13. The two apexes t1 and t2 are located equidistant from the upper end of the fold 12c of the front panel 12 and at the same height. The upper edge of the portion connecting the two apexes t1 and t2 is formed in a straight line parallel to the upper edges of the left and right side panels 11 and 13.

[0034] The same is true for the back panel 14. Two apexes t3 and t4 are provided at a distance from each other at positions higher than the upper edges of the left and right side panels 11 and 13, and oblique sides (diagonal upper edges) that rise toward the two apexes t3 and t4 extend from the right side panel 13 and the left side panel 11.

[0035] 2 to 4, packaging body 20 is composed of a thin, soft laminated film primarily made of flexible plastic. Packaging body 20 includes rectangular surface film 20A and back film 20B that form its front and back surfaces, with top end 21, both side edges 23 and 24, and bottom end 25 of the two front and back films 20A and 20B sealed to one another. Processed foods (freeze-dried foods, instant rice, etc.) are stored in the space sandwiched between surface film 20A and back film 20B. Packaging body 20 may be a bottom gusset type that includes a bottom film that forms a gusset at the bottom in addition to surface film 20A and back film 20B. In this case, both side edges of front and back films 20A and 20B are sealed to one another at the top of packaging body 20, and the outer periphery of the bottom film is sealed to the outer periphery of front and back films 20A and 20B at the bottom of packaging body 20. The package 20 may be constructed by folding a single piece of film and sealing the top end and the left and right side ends. In this case, the two overlapping film portions formed by folding become the front film 20A and the back film 20B, respectively. Sealing is performed by adhering (including welding) the film.

[0036] The upper portions of both side end portions 23, 24 of package 20 are made to have a so-called easy-peel adhesive, which allows the seal between front film 20A and back film 20B to be peeled off with a light force. For example, by setting the temperature during heat sealing to a low temperature, the upper portions of both side end portions 23, 24 of package 20 can be easily peeled off and adhered. The strength of the upper portions of both side end portions 23, 24 of package 20 is approximately 15N / 15mm to 10N / 15mm, and the front film 20A and back film 20B can be easily peeled off by hand.

[0037] The packaging body 20 is adhered to the inner surface of the sleeve 10. Referring to FIG. 2, FIG. 2 shows a state in which both sides of the blank of the sleeve 10 shown in FIG. 1 are adhered with adhesive N to form a tube that is open at the top and bottom, and further, the creases 11c, 13c formed on the left and right side panels 11, 13 are mountain-folded (folded outward). The packaging body 20 is adhered to the inside of the tubular sleeve 10 with its upper portion exposed from the sleeve 10. In other words, the outer periphery of the packaging body 20, excluding its upper portion, is surrounded by the sleeve 10. The surface film 20A of the packaging body 20 is adhered to the inner surface of the front panel 12 of the sleeve 10 by adhesive H (shown by a dashed line in FIG. 2) that is applied vertically to the inner surface of the front panel 12 of the sleeve 10. Although not shown in FIG. 2, adhesive H is also applied to the inner surface of the back panel 14 of the sleeve 10 in a similar manner, and the back film 20B of the packaging body 20 is adhered to the back panel 14. The composite container 1 comprising the sleeve 10 and the packaging body 20 is transported, stored, and displayed in stores in the folded state shown in FIG.

[0038] At the upper part of the packaging body 20 that protrudes above the sleeve 10, a notch 26 is formed on each of the side end parts 23, 24. The notch 26 is formed slightly below the sealed upper end part 21 of the packaging body 20, and the notch 26 serves as an opportunity to tear the upper end part 21 of the packaging body 20 sideways, and tearing the upper end part 21 of the packaging body 20 sideways opens the top of the packaging body 20.

[0039] When the left and right side panels 11, 13 (these folds 11c, 13c) of the folded sleeve 10 are pushed toward each other, the folds of the side panels 11, 13 gradually unfold and unfold. At the same time, the distance between the front panel 12 and the back panel 14 gradually increases, and the sleeve 10 becomes cylindrical with wide openings at the top and bottom. In other words, the sleeve 10 is erected. As described above, the front film 20A and the back film 20B of the packaging body 20 are respectively adhered to the front panel 12 and the back panel 14 of the sleeve 10. Therefore, when the front panel 12 and the back panel 14 of the sleeve 10 move apart, the front and back films 20A, 20B of the packaging body 20 also move apart, widening the gap between them. The upper opening of the packaging body 20 widens (Figure 3). Because the lower edge of the sleeve 10 is formed in a straight line, the erected sleeve 10 stands stably on its own.

[0040] As shown in Figure 3, it is recommended that the left and right side panels 11, 13 be folded so that the creases 11c, 13c are slightly turned inward (slight valley folds). This crease makes it difficult for the left and right side panels 11, 13 to return to their folded state, allowing the sleeve 10 to be stably maintained in its erect state.

[0041] Referring to Figure 4, the upper portions (easily peelable adhesive portions) of both side end portions 23, 24 of package 20 are torn in the front-to-rear direction (the direction connecting the front and back surfaces), and surface film 20A and back surface film 20B are separated at the top of package 20. The separated surface film 20A is folded back toward front panel 12 and hung on the upper edge of front panel 12, and the other back surface film 20B is folded back toward back panel 14 and hung on the upper edge of back panel 14. As described above, because the upper portions of both side end portions 23, 24 of package 20 are easily peelably adhesively attached, surface film 20A and back surface film 20B can be easily peeled and separated. The surface and back surfaces 20A, 20B have sufficient dimensions to be hung on the upper edges of the front and back panels 12, 14 of sleeve 10, respectively, when the surface and back surfaces 20A, 20B are folded back in opposite directions. By folding the front and back films 20A, 20B, the opening at the top of the package 20 is not defined by the upper edges of the front and back films 20A, 20B but by the folded edges.

[0042] As described above, two apexes t1 and t2 are provided on the upper edge of the front panel 12 (see Figures 1 and 3), and similarly, two apexes t3 and t4 are provided on the upper edge of the back panel 14 (see Figure 1). The surface film 20A hung on the upper edge of the front panel 12 comes into contact with (gets caught on) the apexes t1 and t2 and is locally pressed (supported) from the inside. As a result, wrinkles 27 extending vertically (in the direction connecting the upper and lower openings of the sleeve 10) are formed on the surface film 20A within the sleeve 10. Similarly, wrinkles 27 extending vertically are also formed on the back film 20B. The wrinkles 27 are formed between the apexes t1 and t2, which are formed with a gap between them, and between the apexes t3 and t4.

[0043] The formation of wrinkles 27 helps to maintain the top opening (folded edge) of package 20 in a state where it is wide open in the front-to-back direction. For example, hot water is poured into package 20, which dissolves or softens processed foods to create soup, rice, etc. The wide top opening makes it easy to pour hot water into package 20. In addition, the raised sleeve 10 allows package 20 to stand stably, so there is little risk of composite container 1 tipping over and spilling the contents while pouring hot water. Furthermore, because the corners of raised sleeve 10 do not come into contact with package 20, the heat of package 20 is less likely to be transferred to the hand even when the corner is held in the hand, so the hand does not feel hot.

[0044] If the difference in height between the upper edges of the left and right side panels 11, 13 and the apexes t1 to t4 of the front and back panels 12, 14 is too large, the front and back films 20A, 20B that are folded back and hung over the upper edges of the front and back panels 12, 14 will float significantly above the upper edges of the front and back panels 12, 14 in areas other than the apexes t1 to t4, which may cause an unstable shape of the upper opening of the package 20. Preferably, the height from the lower edges of the front and back panels 12, 14 to the apexes t1 to t4 is kept within 1.3 times the height of the left and right side panels 11, 13 (the length from the lower edge to the upper edge).

[0045] 5 to 7 show another embodiment.

[0046] The sleeve 10A shown in Fig. 5 differs from the sleeve 10 shown in Fig. 1 in that the spacing between the apexes t1 and t2 and the spacing between the apexes t3 and t4 are wider. In the sleeve 10A shown in Fig. 5, when the front and back films 20A and 20B constituting the package 20 are folded over and hung over the upper edges of the front and back panels 12 and 14, the apexes t1, t2, t3, and t4 locally press the front and back films 20A and 20B from the inside, thereby forming wrinkles 27 (see Fig. 4) within the sleeve 10. The apexes t1 and t2 are preferably positioned between the upper ends of the outwardly arc-shaped folds 12a and 12b formed in the front panel 12. The same applies to the apexes t3 and t4.

[0047] 1, in which two apexes t1, t2 and two apexes t3, t4 are formed, is different from sleeve 10 shown in Fig. 1, in that one apex t1, t3 is formed on each of the upper edges of front panel 12 and back panel 14. Even though only one apex is formed on the upper edges of front panel 12 and back panel 14, front and back films 20A, 20B hanging on the upper edges can be pressed locally from the inside, and wrinkles 27 can be sufficiently formed within sleeve 10.

[0048] The sleeve 10C shown in Fig. 7 differs from the sleeve 10 shown in Fig. 1 in that upward arc-shaped notches K are formed above the folds 12c, 14c of the front panel 12 and the back panel 14. By lightly inserting the front and back films 20A, 20B into the notches K, the folded front and back films 20A, 20B can be easily kept in the folded state. [Explanation of symbols]

[0049] 10,10A,10B,10C, 11 Left side panel 12 Front Panel 13 Right side panel 14 Rear Panel 20A Surface Film 20B back film 21 Upper edge 23 Left edge 24 Right edge 25 Lower edge 26 notches 27 Wrinkles t1,t2,t3,t4 top K Cut

Claims

1. The packaging body has a surface film and a back film, and both side edges are sealed, and a sleeve that is open at the top and bottom and is provided around the outside of the packaging body, The sleeve is a first fold line extending in a direction connecting the upper and lower openings; left and right side panels foldable along the first fold line; and a front panel and a back panel connected to the left and right side panels and bonded to the surface film and the back film of the packaging body, respectively; The packaging body is At least the upper portions of the both side edges are easily peeled and bonded, the front and back films have dimensions that allow them to be hung on the upper edges of the front and back panels of the sleeve when the easily peelable adhesive portions at the upper portions of the both side edges are peeled off and the front and back films are folded back in opposite directions, The upper edges of the front and rear panels, to which the front and rear films are attached, each have a peak that is higher than the upper edges of the left and right side panels, and a slope that rises toward the peak, A pair of outward arc-shaped second folds extending in a direction connecting the upper and lower openings of the sleeve are further formed on each of the front and back panels and the left and right side panels without contacting each other. Composite container.

2. The sleeve is The left and right side panels are folded when they are mountain-folded along the first fold lines, When the left and right side panels are valley-folded along the first fold line, the top and bottom are open. The composite container according to claim 1.

3. The boundaries between the left and right side panels and the front and rear panels are formed in an outward arc shape when viewed from the left and right side panels. The composite container according to claim 1 or 2.

4. A linear third fold extending in a direction connecting the upper and lower openings of the sleeve is further formed between the pair of outward arc-shaped second folds of the front and rear panels. The composite container according to claim 1.

5. In the above case, a notch is formed at the top of the rear panel. The composite container according to any one of claims 1 to 4.

6. A blank material for forming a sleeve having a left side panel, a front panel, a right side panel, and a back panel connected via folds, the sleeve being open at the top and bottom when a side portion of the left side panel and a side portion of the back panel are bonded to each other, First folds for folding the left and right side panels are formed from the lower edges to the upper edges of the left and right side panels, The upper edges of the front and rear panels each have a peak that is higher than the upper edges of the left and right side panels, and a slope that rises toward the peak, A pair of outward arc-shaped second folds extending in a direction connecting the upper and lower openings of the sleeve are further formed on each of the front and back panels and the left and right side panels without contacting each other. Blank material.

7. The height from the lower edge of the rear panel to the top is within 1.3 times the height of the left and right side panels. The blank according to claim 6.

8. In the above case, a notch is formed at the top of the rear panel. A blank according to claim 6 or 7.

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