Packaging box

Abstract

To provide a packaging box capable of suppressing body swelling of a wall body and reducing a manufacturing cost.SOLUTION: A corrugated board packaging box 1 includes a cylindrical body part 10, a top part 20 provided on an upper side of the body part 10, and a bottom part 30 provided on a lower side of the body part 10, and a corrugation direction of a core in an end wall 11 (wall body) is arranged in a vertical direction. At an upper end portion of the end wall 11, two bending ruled lines L10 and L10 that are bent so as to protrude downward are formed side by side in the lateral direction. At least one of both ends of the bending ruled line L10 is connected to the upper edge L1 of the end wall 11.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] When cardboard packaging boxes are stacked, if a load from above causes the walls to bend outward and bulge, the packaging boxes look unattractive. To address this, some conventional packaging boxes have creases formed in the horizontal middle of the walls, extending from the upper edge to the lower edge (see, for example, Patent Document 1). With this configuration, when a load is applied from above, the walls are regularly deformed along the creases, thereby suppressing bulging. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-042558 Summary of the Invention [Problem to be solved by the invention]

[0004] In the process of manufacturing blank sheets for packaging boxes, a form that matches the size of the wall body is pressed against the surface of the sheet to form ruled lines on the wall body. Therefore, when forming a crease from the upper edge to the lower edge of the wall body as in the conventional packaging box described above, it is necessary to prepare a formwork that matches the height of the wall body each time the height of the wall body changes, which results in a problem of high manufacturing costs for the packaging box.

[0005] An object of the present invention is to solve the above-mentioned problems, to provide a packaging box that can suppress bulging of the wall body and reduce manufacturing costs. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a cardboard packaging box made of laminated cores and liners, comprising a cylindrical body having a plurality of walls, a top provided on the upper side of the body, and a bottom provided on the lower side of the body. The corrugations of the cores in the walls are arranged vertically. Two bend creases are formed horizontally at the upper end of the wall, bending so as to protrude downward. At least one of the ends of the bend crease is connected to the upper edge of the wall. In the present invention, the end of the bend crease refers to a predetermined section including the extreme end of the bend crease.

[0007] In the packaging box of the present invention, when a load is applied from above and the wall body bulges outward due to the load, a ridge line is formed in the wall body extending linearly downward from the bending point of the bending crease, resulting in two ridge lines extending downward from the two bending creases, and the area between the ridge lines bulges outward in a substantially flat state. As a result, in the packaging box of the present invention, the wall body protrudes less than when it curves outward, thereby suppressing bulging. Also, because the wall body deforms regularly, the appearance can be improved even when the wall body is deformed.

[0008] In the present invention, when a load is applied to the packaging box from above, a ridge line extending vertically along the corrugations of the cardboard from the bending point of the bent crease formed at the upper end of the wall body is naturally formed, eliminating the need for a formwork for forming vertical creases on the wall body. Furthermore, in the packaging box of the present invention, two bending lines are formed only at the upper end of the wall body, so even if the height or width of the wall body changes, the same mold can be used to form both bending lines. Therefore, the present invention can reduce the manufacturing costs of packaging boxes having a bulge suppression structure.

[0009] Furthermore, in the packaging box of the present invention, both ends of the bending crease are connected to the upper edge of the wall, so that a load applied from above is easily transmitted to the bending crease. In other words, in the packaging box of the present invention, the load from above is reliably applied to both bending creases of the wall, allowing the wall to be deformed regularly.

[0010] When the top of the packaging box has a top plate connected to the upper edge of the wall, it is preferable that the end of the bent crease extends beyond the upper edge of the wall to the top plate. In this way, when forming the bent crease in the wall body in the manufacturing process of the blank sheet, even if a manufacturing error occurs, the end of the bent crease can be formed in a state where it is connected to the upper edge of the wall body.

[0011] In the packaging box described above, it is preferable that the two bending creases are formed continuously. In this configuration, a load applied to the packaging box from above is transmitted to the two bending creases in an evenly distributed manner, so that two ridge lines are neatly formed on the wall body.

[0012] In the packaging box described above, the body may be formed by the front, rear, left, and right walls, the top may include front and rear top plates connected to the upper edges of the front and rear walls, and the two bending creases may be formed at the upper ends of the front and rear walls. In this way, it is possible to suppress the body of the packaging box, which is an A-type corrugated cardboard box, improve the appearance even when the walls are deformed, and further reduce the manufacturing cost of the packaging box. [Effects of the Invention]

[0013] In the packaging box of the present invention, when the wall body is deformed by a load applied from above, two horizontally aligned ridge lines are formed on the wall body, thereby suppressing bulging and improving the appearance even when the wall body is deformed. Furthermore, in the present invention, when a load is applied to the packaging box from above, vertical ridge lines are naturally formed on the wall body, eliminating the need for a formwork for forming vertical creases on the wall body. Furthermore, in the present invention, a bent crease is formed on the upper end of the wall body, so that the same formwork can be used to form both bent creases even if the height or width of the wall body changes. Therefore, the present invention reduces the manufacturing cost of packaging boxes with a bulge-suppressing structure. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the front upper right. [Figure 2] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper right rear side. FIG. [Figure 3] 1 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention; [Figure 4] 1 is a perspective view showing a state in which a load is applied from above to a packaging box according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the front, rear, left and right directions are set for the convenience of describing the packaging box of this embodiment, and do not limit the configuration or usage state of the packaging box.

[0016] As shown in Figures 1 and 2, the packaging box 1 of this embodiment is an A-type cardboard box, and has a body 10 formed in a rectangular cylindrical shape, a top 20 provided at the upper opening of the body 10, and a bottom 30 provided at the lower opening of the body 10.

[0017] The packaging box 1 of this embodiment is formed by mountain or valley folding a blank sheet S cut out from a cardboard sheet with flat liners laminated on both sides of a corrugated core, as shown in Fig. 3. The blank sheet S shown in Fig. 3 is arranged so that the inner surface is visible. The fold lines of the blank sheet S are creases (pressed creases) formed by pressing the surface of the blank sheet S linearly.

[0018] 1 and 2, the body 10 has a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The front and rear end walls 11, 11 and the left and right side walls 12, 12 are rectangular wall bodies. In this embodiment, a strip-shaped joining piece 13 is provided continuously at the left edge of the rear end wall 11. The joining piece 13 is attached to the inner surface of the left side wall 12.

[0019] When the blank sheet S (see Figure 3) is folded along each fold line and the joining piece 13 is joined to the inner surface of the left side wall 12, the front and rear end walls 11, 11 and the left and right side walls 12, 12 form a cylindrical body 10 that is rectangular in plan view. In this embodiment, the steps of the cores in the end walls 11 are arranged in the vertical direction (see FIG. 3).

[0020] The top portion 20 comprises a pair of front and rear top plates 21, 21 connected to the upper edge portions L1, L1 of the front and rear end walls 11, 11, respectively, and a pair of left and right inner flaps 22, 22 connected to the upper edge portions of the left and right side walls 12, 12, respectively. The top portion 20 is formed by stacking the top plates 21, 21 on the upper surfaces of the inner flaps 22, 22. The leading edges of the top plates 21, 21 butt against each other, and the top portion 20 closes the opening on the upper side of the body portion 10.

[0021] The bottom 30 has a pair of front and rear outer flaps 31, 31 connected to the lower edge portions of the front and rear end walls 11, 11, respectively, and a pair of left and right inner flaps 32, 32 connected to the lower edge portions of the left and right side walls 12, 12, respectively. The bottom 30 is formed by overlapping the two outer flaps 31, 31 on the undersides of the two inner flaps 32, 32. The leading edges of the two outer flaps 31, 31 are butted together, and the bottom 30 closes the opening on the lower side of the body 10.

[0022] As shown in Fig. 1, two V-shaped bent creases L10, L10 are formed side by side in the left-right direction (horizontal direction) at the upper end of the front end wall 11 (see Fig. 3). The two bent creases L10, L10 are formed in the middle of the end wall 11 in the left-right direction. The bent crease L10 is a crease (pressed crease) formed by linearly pressing the inner surface of the end wall 11. The vertical distance from the upper edge L1 of the end wall 11 to the bending point P1 (inflection point) of the bent crease L10 is preferably between 1.0 cm and 1.5 cm.

[0023] The left and right bent creases L10, L10 are formed symmetrically. In this embodiment, the innermost end points of the left and right bent creases L10, L10 (the center of the end wall 11 in the left-right direction) are connected to each other. In this manner, the left and right bent creases L10, L10 are formed continuously, and the left and right bent creases L10, L10 are formed in a W shape in a front view (see FIG. 3). A connection point P2 between the two bent creases L10, L10 is connected to the center of the upper edge L1 of the end wall 11 (see FIG. 3).

[0024] The outer end of the bent crease L10 (opposite the center of the end wall 11 in the left-right direction) extends beyond the upper edge L1 of the end wall 11 to the front end of the top plate 21 (see FIG. 3). In other words, the most extreme point P3 of the outer end of the bent crease L10 is located at the front end of the top plate 21. Furthermore, an intersection P4 between the end of the bent crease L10 and the upper edge L1 of the end wall 11 is spaced apart from the end of the upper edge L1 of the end wall 11.

[0025] As shown in Fig. 2, left and right bending creases L10, L10 are formed on the upper end of the rear end wall 11, similar to the front end wall 11 (see Fig. 1). That is, of the multiple walls that form the body 10, left and right bending creases L10, L10 are formed on each of the opposing walls (end walls 11, 11).

[0026] 4, when a load is applied from above and the end wall 11 is pushed outward by the load, the end wall 11 is deformed so that a triangular inclined surface is formed in the area surrounded by the upper edge L1 of the end wall 11 and the bending line L10. That is, the upper end of the end wall 11 is deformed so that the bending point P1 of the bending line L10 juts outward. As a result, a ridge line L20 (fold line) is formed on the end wall 11, extending linearly downward from the bending point P1 of the bent crease line L10.

[0027] In this way, in the packaging box 1 of this embodiment, a load applied from above forms two ridge lines L20, L20 extending downward from both bending creases L10, L10 on the end wall 11. Then, the region between the ridge lines L20, L20 on the end wall 11 protrudes outward in a substantially flat state. As a result, in the packaging box 1 of this embodiment, the end walls 11 protrude less than when they curve outward, thereby suppressing bulging. Also, because the end walls 11 deform regularly, the packaging box 1 can maintain a good appearance even when the end walls 11 are deformed.

[0028] Furthermore, in the packaging box 1 of this embodiment, both ends of the bending crease L10 are connected to the upper edge L1 of the end wall 11, so that a load applied from above to the packaging box 1 is easily transmitted to both bending creases L10, L10. This allows the load from above to be reliably applied to both bending creases L10, L10, thereby regularly deforming the end wall 11.

[0029] In addition, in the packaging box 1 of this embodiment, both bending lines L10, L10 are formed continuously, and the load acting on the packaging box 1 from above is evenly distributed and transmitted to both bending lines L10, L10, so that two ridge lines L20, L20 are neatly formed on the end wall 11.

[0030] Furthermore, in the packaging box 1 of this embodiment, when a load is applied from above, a ridge line L20 is naturally formed extending vertically along the corrugations of the cardboard from the bending point P1 of the bending crease L10 formed at the upper end of the end wall 11, eliminating the need for a formwork for forming a vertical crease on the end wall 11. Furthermore, in the packaging box 1 of this embodiment, both bending creases L10, L10 are formed at the upper end of the end wall 11. In this configuration, even if the height or width of the end wall 11 changes, the same mold can be used to form both bending creases L10, L10. Therefore, in the packaging box 1 of this embodiment, the configuration of the form for forming the blank sheet S (see FIG. 3) can be simplified, and the manufacturing cost of the packaging box 1 can be reduced.

[0031] In the packaging box 1 of this embodiment, the end of the bending crease L10 extends beyond the upper edge L1 of the end wall 11 to the top plate 21. In addition, the intersection P4 between the bending crease L10 and the upper edge L1 of the end wall 11 is spaced apart from the end of the upper edge L1 of the end wall 11. In this configuration, when forming the bent crease L10 in the end wall 11 during the manufacturing process of the blank sheet S shown in Figure 3, even if a manufacturing error occurs, the end of the bent crease L10 can be formed in a state connected to the upper edge portion L1 of the end wall 11.

[0032] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. In this embodiment, as shown in FIGS. 1 and 2, the left and right bending lines L10, L10 are formed symmetrically, but the shapes of the bending lines L10, L10 may be different. Furthermore, although both bending creases L10, L10 are disposed in the middle of the end wall 11 in the left-right direction, the positions of both bending creases L10, L10 are not limited thereto. Furthermore, in this embodiment, the left and right bending lines L10, L10 are formed continuously, but the bending lines L10, L10 may be arranged with a gap between them in the horizontal direction. Furthermore, the inclination angle of the bending line L10 relative to the upper edge L1 of the end wall 11 is not limited, but is set appropriately so that the end wall 11 is easily deformed at the bending line L10 when a load acts on the packaging box 1 from above.

[0033] In the packaging box 1 of this embodiment, the outer end of the bent crease L10 extends beyond the upper edge L1 of the end wall 11 to the top plate 21, but the most extreme point P3 of the outer end of the bent crease L10 may also be positioned on the upper edge L1 of the end wall 11.

[0034] In the packaging box 1 of this embodiment, both ends of the bending line L10 are connected to the upper edge portion L1 of the end wall 11, but it is sufficient that at least one of the both ends of the bending line L10 is connected to the upper edge portion L1 of the end wall 11.

[0035] In the packaging box 1 of this embodiment, the connection point P2 of both bending creases L10, L10 is connected to the upper edge portion L1 of the end wall 11, but the bending creases L10, L10 may be extended so that the connection point P2 of both bending creases L10, L10 is located on the top plate 21. Also, the connection point P2 of both bending creases L10, L10 may be located at the upper end of the end wall 11, away from the upper edge portion L1 of the end wall 11.

[0036] In this embodiment, the bending crease L10 is formed on the end wall 11, but the bending crease L10 may be formed on both the end wall 11 and the side wall 12. Alternatively, the bending crease L10 may be formed on the side wall 12 only.

[0037] In this embodiment, the configuration of the top portion 20 and the bottom portion 30 is not limited. For example, the top portion may be formed by one top plate, and the bottom portion may be formed by one bottom plate.

[0038] In the packaging box 1 of this embodiment, the body 10 is formed into a rectangular cylindrical shape by four walls (two end walls 11, 11 and two side walls 12, 12), but the number of walls that form the body 10 is not limited. For example, an inclined wall may be provided between the end wall 11 and the side wall 12, so that the body 10 is formed into a hexagonal or octagonal cylindrical shape.

[0039] The present invention is applicable to various types of packaging boxes, including, for example, wrap-around type packaging boxes. [Explanation of symbols]

[0040] 1 packaging box 10. Torso 11 End Wall 12 Side wall 13 Joint piece 20 Top 21 Top plate 22 Inner flap 30 bottom 31 Outer flap 32 Inner flap L1 upper edge L10 bent crease L20 ridgeline P1 bending point P2 connection point P3 extreme point P4 intersection S Blank Sheet

Claims

1. A cardboard packaging box made by laminating a core and a liner, a cylindrical body having a plurality of walls; a top portion provided on an upper side of the body portion; a bottom portion provided below the body portion, The step direction of the core in the wall body is arranged in the vertical direction, At the upper end of the wall body, Two curved lines are formed side by side, protruding downwards. A packaging box characterized in that at least one of both end portions of the bending crease is connected to the upper edge portion of the wall body.

2. The packaging box according to claim 1, The top portion is a top plate connected to the upper edge of the wall; The packaging box is characterized in that the end of the bending crease extends beyond the upper edge of the wall body to the top plate.

3. The packaging box according to claim 1, A packaging box characterized in that both of the bending lines are formed continuously.

4. The packaging box according to claim 1, The body portion is formed by the front, rear, left, and right walls, The top portion includes front and rear top plates respectively connected to upper edge portions of the front and rear wall bodies, A packaging box characterized in that the two bending lines are formed on the upper end portions of the front and rear walls, respectively.

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