Packing box

Abstract

To provide a packaging box capable of making it difficult to produce a gap between a body portion and a lid portion when the lid portion is closed.SOLUTION: A packaging box 1A includes a cylindrical body 10, and a lid portion 20 provided at an opening portion of the body 10. The lid portion 20 has an outer flap 22 that is connected to an edge of a side wall 12 via a first ruled line L1. A second ruled line L21 extending in a front-rear direction is formed at a base end of the outer flap 22. The second ruled line L21 is a line that is bent so as to protrude toward a tip side of the outer flap 22. Front and rear ends of the second ruled line L21 are respectively connected to front and rear ends of the first ruled line L1.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] In a cardboard packaging box of type A, outer flaps are continuously provided at the upper and lower edges of the body through ruled lines. By bending the outer flaps with respect to the body and connecting the tip ends of the left and right outer flaps with an adhesive tape, a lid portion is formed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described conventional packaging box, when the outer flaps are bent with respect to the body and the tip ends of the left and right outer flaps are connected with an adhesive tape, the outer flaps may try to return due to the restoring force, and a large gap may be generated between the edge of the body and the inner surface of the outer flap.

[0005] An object of the present invention is to solve the above-described problems and provide a packaging box capable of making it difficult to generate a gap between the body and the lid when the lid is closed.

Means for Solving the Problems

[0006] To solve the above problems, the present invention provides a packaging box including a cylindrical body having front and rear end walls and left and right side walls, and a lid provided at an upper or lower opening of the body. The lid is provided at the upper and lower edges of the side wall linearIt has an outer flap connected in series via a first ruled line. At the base end of the outer flap, a second ruled line extending in the front-rear direction is formed. The second ruled line is a line bent so as to protrude toward the tip side of the outer flap. The front and rear ends of the second ruled line are respectively connected to the front and rear ends of the first ruled line.

[0007] In the packaging box of the present invention, by forming a second ruled line at the base end of the outer flap, when the outer flap is bent with respect to the side wall at the first ruled line, the restoring force of the outer flap can be reduced. As a result, when the outer flap is closed, the portion on the tip side of the outer flap is likely to tilt toward the body side, so that a gap is less likely to occur between the edge of the body and the side edge of the outer flap.

[0008] In addition, if the end of the second ruled line is separated from the end of the first ruled line, when the outer flap is bent with respect to the body, the entire region between the end of the second ruled line and the end of the first ruled line is likely to float from the body, so that a gap is likely to occur between the edge of the body and the side edge of the outer flap at the base end of the outer flap. On the other hand, in the packaging box of the present invention, since the end of the second ruled line is connected to the end of the first ruled line, a gap is less likely to occur between the base end of the outer flap and the body.

[0009] Also, when the second ruled line is a straight line, when the outer flap is bent with respect to the side wall at the first ruled line, the outer flap is likely to bend at the second ruled line. And when the outer flap bends at the second ruled line, the entire region between the end of the second ruled line and the end of the first ruled line is likely to float from the body, so that a gap is likely to occur between the edge of the body and the side edge of the outer flap at the base end of the outer flap. In the packaging box of the present invention, since the second ruled line is a bent line, when the outer flap is bent with respect to the side wall at the first ruled line, it is possible to prevent the outer flap from bending at the second ruled line. As a result, a gap is less likely to occur between the base end of the outer flap and the body.

[0010] In addition, the distance between the point on the second ruled line that protrudes maximally toward the tip side of the outer flap and the first ruled line (the maximum width in the left-right direction between the second ruled line and the first ruled line) is desirably 10 mm or more. If the above-mentioned distance is less than 10 mm, there is a risk that the effect of reducing the restoring force of the outer flap cannot be sufficiently obtained. Also, the distance between the point on the second ruled line that protrudes maximally toward the tip side of the outer flap and the first ruled line is desirably 1 / 2 or less of the distance between the base edge portion and the tip edge portion of the outer flap. If the above-mentioned distance exceeds 1 / 2, when trying to bend the outer flap, the second ruled line may bend before the first ruled line, and there is a risk that the workability when closing the lid portion may deteriorate.

[0011] In the above-mentioned packaging box, the entire second ruled line may be curved in an arc shape, or the second ruled line may be bent at the middle portion.

[0012] An inner flap connected via a third ruled line is provided on the upper and lower edges of the end wall on the lid portion of the above-mentioned packaging box, and the outer flap can be overlapped on the outer surface of the inner flap. In this case, the upper and lower ends of the end wall at a position vertically spaced from the vertical edges of the end wall It is preferable to form a fourth ruled line extending in the left-right direction along the third ruled line.

[0013] In this configuration, when the inner flap is bent with respect to the end wall, the end wall bends with respect to the inner flap at the third ruled line and the fourth ruled line. As a result, the inner flap bends from a position inside the base edge portion (first ruled line) of the outer flap, and since the inner flap is disposed inside the body portion rather than the outer flap, it becomes easier to overlap the outer flap on the outer surface of the inner flap.

Effects of the Invention

[0014] According to the packaging box of the present invention, by forming a second ruled line bent at the base end portion of the outer flap and connecting the end portion of the second ruled line to the end portion of the first ruled line, when the lid portion is closed, it becomes difficult for a gap to occur between the body portion and the lid portion.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0016] Embodiments of the present invention will be described in detail with appropriate reference to the drawings. In the description of each embodiment, the same reference numerals are assigned to the same components, and duplicate descriptions are omitted. In the following description, the front-back, left-right directions are set for convenience in explaining the packaging box of the present embodiment, and do not limit the configuration or usage state of the packaging box.

[0017] [First Embodiment] As shown in FIG. 1, the packaging box 1A of the first embodiment includes a rectangular cylindrical body portion 10, an upper lid portion 20 that closes the upper opening of the body portion 10, and a lower lid portion 20 that closes the lower opening of the body portion 10. The packaging box 1A of the first embodiment is a type-A cardboard box.

[0018] As shown in FIG. 2, the packaging box 1A of the first embodiment is formed by mountain-folding or valley-folding a blank sheet S1 obtained by cutting out a cardboard sheet at each grid line. The blank sheet S1 shown in FIG. 2 is arranged so that the inner surface side is visible.

[0019] The grid lines of the blank sheet S1 are indentations formed by linearly pressing the surface of the blank sheet S1. Note that intermittent cuts may be formed in the grid lines. By doing so, it becomes easier to bend the blank sheet S1 at the grid lines. Alternatively, a ruled line may be formed by intermittently forming a half-cut notch that cuts only the surface of the sheet or a notch that penetrates the sheet in a linear manner.

[0020] As shown in FIG. 1, the body portion 10 includes a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The end walls 11 and the side walls 12 are formed in a quadrangular shape. The end wall 11 and the side wall 12 are vertically connected via a ruled line. In the first embodiment, a cylindrical body portion 10 is formed by attaching a joining piece 13 continuously provided at the rear edge portion of the left side wall 12 to the inner surface of the rear end wall 11. Square openings are formed on the upper and lower surfaces of the body portion 10.

[0021] The upper lid portion 20 has a pair of front and rear inner flaps 21, 21 respectively continuously provided on the front and rear end walls 11, 11, and a pair of left and right outer flaps 22, 22 respectively continuously provided on the left and right side walls 12, 12.

[0022] The inner flap 21 is continuously provided at the upper edge portion of the end wall 11 via a third ruled line L3. The third ruled line L3 is a linear ruled line extending in the left - right direction and is formed on the inner surface of the blank sheet S1 (see FIG. 2). The front inner flap 21 closes the front part of the upper opening of the body portion 10, and the rear inner flap 21 closes the rear part of the upper opening of the body portion 10. The front and rear inner flaps 21, 21 are arranged at intervals in the front - rear direction.

[0023] Also, at the upper end portion of the inner surface of the end wall 11, a linear fourth ruled line L4 extending in the left - right direction along the third ruled line L3 is formed. The third ruled line L3 and the fourth ruled line L4 are formed at intervals in the up - down direction.

[0024] The base end edge portion of the outer flap 22 is continuously provided at the upper edge portion of the side wall 12 via a first ruled line L1. The front portion of the outer flap 22 is overlapped on the outer surface (upper surface) of the front inner flap 21, and the rear portion of the outer flap 22 is overlapped on the outer surface (upper surface) of the rear inner flap 21.

[0025] The left outer flap 22 closes the left half of the upper opening of the body portion 10, and the right outer flap 22 closes the right half of the upper opening of the body portion 10. The leading edges of the left and right outer flaps 22, 22 are butted against each other at the center in the left-right direction of the upper opening of the body portion 10.

[0026] Then, by attaching an adhesive tape (not shown) across the upper end portion of the outer surface of one end wall 11, the outer surfaces of the leading edges of both outer flaps 22, 22, and the upper end portion of the outer surface of the other end wall 11, the leading ends of both outer flaps 22, 22 are connected. In this way, the upper lid portion 20 is closed, and the upper opening of the body portion 10 is closed by the upper lid portion 20.

[0027] A second ruled line L21 extending in the front-rear direction is formed at the base end portion (the end portion on the side wall 12 side) of the outer flap 22. The second ruled line L21 is disposed on the base end side rather than the center in the left-right direction of the outer flap 22. The second ruled line L21 is a line bent so as to project toward the leading end side of the outer flap 22. In the first embodiment, the entire second ruled line L21 is curved in an arc shape. The apex of the second ruled line L21 is disposed at the center in the front-rear direction of the outer flap 22. The front and rear end portions of the second ruled line L21 are respectively connected to the front and rear end portions of the first ruled line L1. That is, the front and rear end portions of the second ruled line L21 are respectively connected to the front and rear end portions of the upper edge portion of the side wall 12.

[0028] In the first embodiment, the lateral interval between the apex that projects maximally toward the leading end side of the outer flap 22 in the second ruled line L21 and the first ruled line L1 is set to be 10 mm or more. Also, the lateral interval between the point that projects maximally toward the leading end side of the outer flap 22 in the second ruled line L21 and the first ruled line L1 is 1 / 2 or less of the lateral length of the outer flap 22.

[0029] The lower lid portion 20 has a structure that is vertically symmetric with the upper lid portion 20. As shown in FIG. 2, it has an inner flap 21 connected to the lower edge portion of the end wall 11 via a third ruled line L3, and an outer flap 22 connected to the lower edge portion of the side wall 12 via a first ruled line L1. In addition, a linear fourth ruled line L4 extending in the left - right direction is formed at the lower end portion of the inner surface of the end wall 11 along the lower third ruled line L3. Also, at the base end portion of the outer flap 22 of the lower lid portion 20, an arcuately curved second ruled line L21 is formed in the same manner as the outer flap 22 of the upper lid portion 20.

[0030] In the packaging box 1A as described above, as shown in FIG. 1, by forming the second ruled line L21 at the base end portion of the outer flap 22, when the outer flap 22 is bent with respect to the side wall 12 at the first ruled line L1, the restoring force with which the outer flap 22 tries to return can be reduced. As a result, when the outer flap 22 is closed, the portion on the tip - side of the outer flap 22 is likely to tilt toward the body portion 10, so that it is difficult for a gap to occur between the edge portion of the body portion 10 and the side edge portion of the outer flap 22.

[0031] In the packaging box 1A of the first embodiment, since the second ruled line L21 is a bent line, when the outer flap 22 is bent with respect to the side wall 12 at the linear first ruled line L1, it is possible to prevent the outer flap 22 from bending at the second ruled line L21. Also, in the packaging box 1A of the first embodiment, both ends of the second ruled line L21 are respectively connected to both ends of the first ruled line L1. By doing so, when the outer flap 22 is bent with respect to the side wall 12, it is possible to prevent the entire base end portion of the outer flap 22 from floating with respect to the inner flap 21, so that it is difficult for a gap to occur between the edge portion of the body portion 10 and the side edge portion of the base end portion of the outer flap 22.

[0032] In the packaging box 1A of the first embodiment, a fourth ruled line L4 is formed along the third ruled line L3 at the upper and lower ends of the end wall 11 (see FIG. 2). In this configuration, when the inner flap 21 is bent with respect to the end wall 11, the inner flap 21 will be bent with respect to the end wall 11 at the third ruled line L3 and the fourth ruled line L4. As a result, the inner flap 21 bends from a position inside the body 10 rather than from the base edge portion (first ruled line L1) of the outer flap 22, and since the inner flap 21 is disposed inside the body 10 rather than the outer flap 22, it becomes easier to overlap the outer flap 22 on the outer surface of the inner flap 21.

[0033] As described above, the first embodiment of the present invention has been described, but the present invention is not limited to the first embodiment, and can be appropriately modified without departing from the spirit thereof. In the packaging box 1A of the first embodiment, as shown in FIG. 1, the upper and lower lid portions 20, 20 are formed symmetrically, but the configuration of the present invention may be applied to only one of the upper and lower lid portions.

[0034] The lid portion 20 of the packaging box 1A of the first embodiment is provided with left and right outer flaps 22, 22, but it may be configured to close the opening of the body 10 with a single outer flap 22. Further, the inner flap 21 may not be provided on the lid portion 20.

[0035] The body 10 of the packaging box 1A of the first embodiment is formed in a rectangular tubular shape, but the shape of the body 10 is not limited, and an inclined wall may be provided between the end wall 11 and the side wall 12 to form the body 10 in a hexagonal or octagonal tubular shape.

[0036] [Second Embodiment] Next, the packaging box 1B of the second embodiment will be described. The packaging box 1B of the second embodiment has a configuration substantially the same as that of the packaging box 1A (see FIG. 1) of the first embodiment, as shown in FIG. 3, and the shape of the second ruled line L21 formed on the outer flap 22 is different.

[0037] The packaging box 1B of the second embodiment is formed by mountain-folding or valley-folding the blank sheet S2 shown in FIG. 4 at each grid line. The blank sheet S2 shown in FIG. 4 is arranged so that the inner surface side is visible.

[0038] As shown in FIG. 3, the second grid line L22 of the packaging box 1B of the second embodiment is bent at the central portion in the front-rear direction. The portion between the front end portion and the bending point of the second grid line L22 is formed linearly, and the portion between the rear end portion and the bending point of the second grid line L22 is formed linearly.

[0039] In the packaging box 1B of the second embodiment, similar to the packaging box 1A (see FIG. 1) of the first embodiment, when the outer flap 22 is closed, the portion on the tip side of the outer flap 22 is likely to tilt toward the body portion 10 side, and it is possible to prevent the entire base end portion of the outer flap 22 from floating with respect to the inner flap 21. Therefore, also in the packaging box 1B of the second embodiment, it is difficult for a gap to occur between the edge portion of the body portion 10 and the side edge portion of the outer flap 22.

[0040] Although the second embodiment of the present invention has been described above, the present invention is not limited to the second embodiment, and can be appropriately changed in the same manner as the first embodiment without departing from the gist thereof. In the packaging box 1B of the second embodiment, as shown in FIG. 3, the second grid line L22 is bent at the central portion in the front-rear direction, but the position where the second grid line L22 is bent is not limited, and it may be bent at the intermediate portion of the second grid line L22.

Explanation of Reference Numerals

[0041] 1A Packaging box (first embodiment) 1B Packaging box (second embodiment) 10 Body portion 11 End wall 12 Side wall 13 Joining piece 20 Lid portion 21 Inner flap 22 Outer flap L1 First grid line L21 Second ruled line (First Embodiment) L22 Second ruled line (Second Embodiment) L3 Third ruled line L4 Fourth ruled line S1 Blank sheet (First Embodiment) S2 Blank sheet (Second Embodiment)

Claims

1. A cylindrical body portion having front and rear end walls and left and right side walls, and a lid portion provided at an upper or lower opening of the body portion, wherein the lid portion has an outer flap continuously provided via a straight first ruled line at upper and lower edges of the side wall in the vertical direction, a second ruled line extending in the front-rear direction is formed at a base end portion of the outer flap, the second ruled line is a line bent so as to protrude toward a tip side of the outer flap, and front and rear end portions of the second ruled line are respectively connected to front and rear end portions of the first ruled line. A packaging box characterized by this.

2. The packaging box according to Claim 1, wherein the entire second ruled line is curved in an arc shape. A packaging box characterized by this.

3. The packaging box according to Claim 1, wherein the second ruled line is bent at an intermediate portion. A packaging box characterized by this.

4. The packaging box according to Claim 1, wherein the lid portion has an inner flap continuously provided via a third ruled line at upper and lower edges of the end wall in the vertical direction, the outer flap is overlapped on an outer surface of the inner flap, and at upper and lower end portions of the end wall, at positions spaced apart in the vertical direction from upper and lower edges of the end wall in the vertical direction, a fourth ruled line extending in the left-right direction along the third ruled line is formed. A packaging box characterized by this.

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