Packing box

Abstract

To provide a packing box which has a simple configuration and can be easily opened.SOLUTION: A packing box comprises: a cylindrical body part 10 having front and rear end walls 11, 12 and left and right side walls 13, 14; a top plate 20 provided at an opening part on the side of the body part 10; and a bottom plate 30 provided at an opening part on the lower side of the body part 10. The top plate 20 comprises: inner flaps 21 provided continuously to the end walls 11, 12; and right and left outer flaps 22 provided continuously to both the side walls 13, 14 and stacked on the outer faces of the inner flaps 21. A chamfered part 51 is formed at a tip corner part of the outer flap 22a, and a hand hole part 53 widening from the chamfered part 51 toward the lower side of each outer flap 22 in plan view is formed at the inner flap 21a located at the lower side of the chamfered part 51.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Methods for sealing the opening of a cardboard packaging box include sticking adhesive tape to the joints of the flaps, or applying hot melt adhesive between overlapping flaps to glue them together (melt fastening). Packaging boxes sealed with adhesive tape can be opened by peeling off the adhesive tape, while packaging boxes sealed with melt fasteners can be opened by peeling off the adhesive portion or by cutting the box (see, for example, Patent Document 1).

[0003] The packaging box of Patent Document 1 is opened by cutting a tear strip formed in the middle of the side, pushing both the left and right sides of the tear strip outward, and cutting the side from the outer flap. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2007-55630 A Summary of the Invention [Problem to be solved by the invention]

[0005] The packaging box of Patent Document 1 has a problem in that it is complicated in structure because it is necessary to form a score line for cutting the tear strip and the outer box. In addition, when opening the box, the part to be cut is long, which requires a lot of time and effort.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a packaging box which solves the above problems, has a simple structure, and is easy to open. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a packaging box having a cylindrical body having front and rear end walls and left and right side walls, a top plate provided at an upper opening of the body, and a bottom plate provided at a lower opening of the body. The top plate includes an inner flap connected to the end wall, and left and right outer flaps connected to the both side walls and overlapping the outer surface of the inner flap. A chamfer is formed at the tip corner of the outer flap, and the inner flap located below the chamfer is formed with a hand hole that spreads from the chamfer toward the lower side of the outer flap in a plan view.

[0008] According to the packaging box of the present invention, the packaging box can be easily opened by simply pushing the inner flap exposed on the outer surface in the area adjacent to the chamfered portion into the inside of the box to open the hand hole, and then holding the outer flap and pulling it upward. Moreover, this can be achieved with a simple structure in which the chamfered portion is formed on the outer flap and the hand hole is formed on the inner flap.

[0009] In the packaging box of the present invention, it is preferable that the chamfered portion is formed on one of the left and right outer flaps, and the hand hole extends under the other outer flap that faces the one outer flap on which the chamfered portion is formed. With this configuration, when a finger is inserted into the hand hole, it becomes easy to grip the tip corner of the other outer flap, making it easier to open the box.

[0010] In the packaging box of the present invention, it is preferable that the chamfered portion is formed in a straight line inclined with respect to the tip surface of the outer flap. With such a configuration, it is easy to form the chamfered portion and it is also easy to push in the hand hole of the inner flap exposed by the chamfered portion. Effect of the Invention

[0011] The packaging box of the present invention has a simple structure and can be easily opened. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper left front side. [Diagram 2] FIG. 2 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention. [Diagram 3] FIG. 1 is a plan view of a key portion showing the chamfered portion and hand hole of a packaging box according to an embodiment of the present invention, where (a) is a plan view showing the state before the hand hole is pushed open, and (b) is a plan view showing the state after the hand hole is pushed open. [Figure 4] 1A and 1B are oblique views showing the procedure for opening a packaging box according to an embodiment of the present invention, in which (a) shows the state in which a right outer flap is opened, and (b) shows the state in which a left outer flap is opened. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, a cardboard packaging box of type A will be described as an example. 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.

[0014] As shown in FIG. 1, the packaging box 1 of this embodiment is an A-type cardboard box having a cylindrical body 10, a top plate 20 provided at an upper opening of the body 10, and a bottom plate 30 provided at a lower opening of the body 10.

[0015] The packaging box 1 of this embodiment is formed by mountain-folding or valley-folding a blank sheet S cut out from a cardboard sheet at each fold line, as shown in Fig. 2. The blank sheet S shown in Fig. 2 is arranged so that the outer surface is visible.

[0016] The fold lines of the blank sheet S are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S. Note that the creases may be formed with intermittent cuts. In this way, it becomes easier to fold the blank sheet S at the fold lines. Alternatively, the folded line may be formed by forming a half-cut slit only on the surface of the sheet or a slit penetrating the sheet in an intermittent linear fashion.

[0017] 1, the body 10 has a pair of front and rear end walls, a front end wall 11 and a rear end wall 12, and a pair of left and right walls 13 and 14. The front end wall 11, the rear end wall 12, the left side wall 13 and the right side wall 14 are formed in a quadrangle (see FIG. 2).

[0018] A left side wall 13 is connected to the left edge of the front end wall 11 via a fold line, and a rear end wall 12 is connected to the rear edge of the left side wall 13 via a fold line. A right side wall 14 is connected to the right edge of the front end wall 11 via a fold line, and a strip-shaped joint piece 15 is connected to the rear edge of the right side wall 14 via a fold line. The joint piece 15 is joined to the inner surface of the rear end wall 12. The front end wall 11 and the rear end wall 12 are formed with handle holes 16 that can be used to hold the hands when lifting the packaging box 1.

[0019] When the blank sheet S (see Figure 2) is folded along each fold line and the joining piece 15 is joined to the inner surface of the rear end wall 12, the front end wall 11, the rear end wall 12, the left side wall 13 and the right side wall 14 form a cylindrical body 10 that is rectangular in plan view.

[0020] The bottom plate 30 closes the opening on the lower side of the body 10. The bottom plate 30 includes a pair of front and rear inner flaps 31, 31 connected to the lower edges of the front end wall 11 and the rear end wall 12, respectively, and a pair of left and right outer flaps 32, 32 connected to the lower edges of the left side wall 13 and the right side wall 14, respectively.

[0021] The outer flaps 32, 32 are overlapped on the outer surfaces (lower surfaces) of the inner flaps 31, 31, and the leading edges of the outer flaps 32, 32 are butted against each other. A hot melt adhesive 23 is applied to the outer surface of the inner flap 31, and the inner flap 31 and the outer flap 32 are bonded together.

[0022] The top plate 20 closes the upper opening of the body 10. The top plate 20 includes a pair of front and rear inner flaps 21, 21 connected to the upper edges of the front end wall 11 and the rear end wall 12, respectively, and a pair of left and right outer flaps 22, 22 connected to the upper edges of the left side wall 13 and the right side wall 14, respectively.

[0023] The leading edge portions of the inner flaps 21, 21 are disposed with a gap therebetween in the front-rear direction. The outer flaps 22, 22 are overlapped on the outer surfaces (upper surfaces) of the inner flaps 21, 21. The leading edge portions of the outer flaps 22, 22 are butted against each other at the center in the left-right direction of the upper opening of the body 10. A hot melt adhesive 23 is applied to the outer surface of the inner flap 21, and the inner flap 21 and the outer flap 22 are bonded together.

[0024] As shown in FIG. 3, a chamfered portion 51 is formed at the tip corner of the outer flap 22 of the top plate 20. In this embodiment, the chamfered portion 51 is formed only at the front tip corner of the left outer flap 22. When distinguishing between the left outer flap 22 with the chamfered portion 51 and the right outer flap 22 without the chamfered portion 51, the left outer flap may be referred to as "22a" and the right outer flap may be referred to as "22b". The chamfered portion 51 is an edge formed by cutting the front protruding corner of the outer flap 22a in a triangular shape, and is formed in a straight line inclined with respect to the tip surface of the outer flap 22a. The lower inner flap 21 is exposed in the triangular portion (the missing portion of the outer flap 22a) cut to form the chamfered portion 51. The size of the triangular portion exposed on the upper surface of the packaging box 1 through the missing portion of the outer flap 22a is large enough for a finger to press in.

[0025] A hand hole 53 is formed in the inner flap 21 of the top plate 20. The hand hole 53 is formed in the inner flap 21 located below the chamfered portion 51. In this embodiment, the hand hole 53 is formed in the front inner flap 21. When distinguishing between the front inner flap 21 in which the hand hole 53 is formed and the rear inner flap 21 in which the hand hole 53 is not formed, the front inner flap may be referred to as "21a" and the rear inner flap may be referred to as "21b". The hand hole 53 is formed in the base end portion (the end portion on the front end wall 11 side) of the inner flap 21a, and spreads from below the chamfered portion 51 toward the lower sides of both outer flaps 22 (in this embodiment, the lower side of the tip portion of the outer flap 22a adjacent to the chamfered portion 51 and the lower side of the tip corner portion of the outer flap 22b facing the chamfered portion 51) in a plan view. The hand hole 53 is formed by cutting the cutting assist line 52 formed extending from the fold line between the front end wall 11 and the inner flap 21a toward the inner flap 21a, and folding the lid portion surrounded by the cutting assist line 52 downward along the fold line (see FIG. 3(b)). The cutting assist line 52 has a pair of protruding parts extending perpendicularly from the fold line toward the tip side (rear) of the inner flap 21a and a connecting part connecting the tips of the protruding parts and extending in the left-right direction, and has a U-shape in a plan view (see FIG. 3(a)).

[0026] When opening the top plate 20 of the packaging box 1 as described above, as shown in FIG. 4(a), first, in the region adjacent to the chamfered portion 51 of the left outer flap 22a, the lid portion surrounded by the cutting assist line 52 is pushed inward (toward the inner space) of the packaging box 1 with the fingers to form the hand hole 53. At this time, as shown in FIG. 3(b) and FIG. 4(b), the cutting assist line 52 is cut and the leading edge of the lid portion surrounded by the cutting assist line 52 is cut off from the inner flap 21a. Then, the lid portion is pushed further downward and folded downward along the fold line to open the hand hole 53. After that, the worker inserts the pushed-in fingers under the leading edge corner of the front of the right outer flap 22b and grasps the leading edge corner. In this state, the outer flap 22b is pulled upward to peel off the melt-fastened portion between the front and rear inner flaps 21 and the right outer flap 22b. As a result, the right outer flap 22b is opened, and the other left outer flap 22a grasps the front-rear middle part of the tip and pulls the left outer flap 22a upward, peeling off the melt-fastened parts between the front and rear inner flaps 21 and the left outer flap 22a. As a result, both outer flaps 22 are spread apart, and the top plate 20 is opened.

[0027] According to the packaging box 1 of this embodiment, the chamfered portion 51 is formed on the outer flap 22 of a normal A-type packaging box, and the hand hole portion 53 is simply formed on the inner flap 21, so that the structure is simple.

[0028] As described above, the outer flap 22b can be opened by simply pushing the inner flap 21a through the triangular space adjacent to the chamfered portion 51 of the outer flap 22a to open the hand hole 53, and then holding the tip corner of the outer flap 22b and pulling it upward. Furthermore, since the right outer flap 22a is open, the left outer flap 22a can be easily opened by grasping the front-rear middle part of the tip. In this way, the top plate 20 of the packaging box 1 can be easily opened with little work and effort.

[0029] In this embodiment, the fingers are inserted into the hand hole 53 from the area adjacent to the chamfered portion 51 of the left outer flap 22a, and the tip corner of the right outer flap 22b is grasped. Since the tip corner has a right-angle shape, it is easy to grasp, making the opening operation even easier.

[0030] In addition, since the chamfered portion 51 is formed in a straight line inclined relative to the tip surface of the outer flap 22a, it becomes easier to form the chamfered portion 51, and since the lid portion covering the hand hole portion 53 is exposed in the area adjacent to the chamfered portion 51, it becomes easier to push in the lid portion of the hand hole portion 53.

[0031] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. In the packaging box 1 of this embodiment, the hand hole 53 extends downward from one (left) outer flap 22a on which the chamfered portion 51 is formed and the other (right) outer flap 22b facing the other outer flap 22a, but is not limited to this. The hand hole may extend downward from one (left) outer flap on which the chamfered portion is formed only to the base end side (left end side) of the outer flap. With this configuration, after pushing a finger into the hand hole, the outer flap on which the chamfered portion is formed can be pulled up by gripping the part of the outer flap on which the chamfered portion is formed closer to the base end than the chamfered part.

[0032] In the above embodiment, the edge of the chamfered portion 51 is linear, but the shape of the chamfered portion 51 is not limited to this. The edge of the chamfered portion may be curved and spread toward the base end of the outer flap 22a, or may be in the shape of a broken line. If the edge spreads toward the base end of the outer flap in this manner, it becomes easier to push the fingers into the finger portion.

[0033] In the above embodiment, the chamfered portion 51 is formed at the front end corner of the left outer flap 22a, but the location and number of chamfered portions are not limited to this. The chamfered portion may be formed on either the left or right outer flap, or may be formed at the rear end corner of the outer flap. The chamfered portion may be formed in multiple locations. [Explanation of symbols]

[0034] 1 packaging box 10. Torso 11 Front end wall 12 Back end wall 13 Left side wall 14 Right side wall 15 Joint piece 20 Top plate 21 Inner flap 22 Outer flap 51 Chamfered part 53 Hand hole part

Claims

1. A cylindrical body portion having front and rear end walls and left and right side walls; A top plate provided at an upper opening of the body portion; A bottom plate provided at an opening on the lower side of the body portion, The top plate is An inner flap connected to the end wall; Left and right outer flaps are connected to the side walls and overlapped on the outer surfaces of the inner flaps, A chamfer is formed at the tip corner of the outer flap, A packaging box characterized in that the inner flap located below the chamfered portion has a hand hole portion that extends from the chamfered portion toward the underside of the outer flap in a plan view.

2. The packaging box according to claim 1, The chamfered portion is formed on one of the left and right outer flaps, The packaging box is characterized in that the hand hole portion extends to the underside of the other outer flap opposite to the one outer flap on which the chamfered portion is formed.

3. The packaging box according to claim 1 or 2, The packaging box is characterized in that the chamfered portion is formed in a straight line inclined with respect to the tip surface of the outer flap.

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