JP2023166143A - packaging box - Google Patents

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

The present invention relates to packaging boxes.

In a type A cardboard packaging box, outer flaps are connected to the upper and lower edges of the body through ruled lines, and by folding the outer flaps against the body, the tips of the left and right outer flaps are A lid portion is formed by connecting them with adhesive tape (for example, see Patent Document 1).

JP2022-055346A

In the conventional packaging box described above, when the outer wrap is folded against the body and the tips of the left and right outer flaps are connected with adhesive tape, the outer flap tries to return due to restoring force and the edge of the body In some cases, a large gap may be created between the outer flap and the inner surface of the outer flap.

SUMMARY OF THE INVENTION An object of the present invention is to provide a packaging box that solves the above-mentioned problems and makes it difficult to form a gap between the body and the lid when the lid is closed.

In order to solve the above problems, the present invention provides a packaging box that includes a cylindrical body having front and rear end walls and left and right side walls, and a lid provided at an opening on the upper or lower side of the body. It has a section and a. The lid portion has an outer flap that is connected to the vertical edge of the side wall via a first ruled line. A second ruled line extending in the front-rear direction is formed at the base end of the outer flap. The second ruled line is a line that is bent so as to protrude toward the distal end 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.

In the packaging box of the present invention, by forming the second ruled line at the base end of the outer flap, when the outer flap is bent against 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 distal end portion of the outer flap tends to tilt toward the body, making it difficult to form a gap between the edge of the body and the side edge of the outer flap.

Note that if the end of the second ruled line is apart from the end of the first ruled line, when the outer flap is folded against the trunk, the gap between the end of the second ruled line and the end of the first ruled line will be Since the entire region tends to be in a state floating from the trunk, a gap tends to occur between the edge of the trunk 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, it is difficult to form a gap between the base end of the outer flap and the body. .

Moreover, when the second ruled line is a straight line, when the outer flap is bent against the side wall at the first ruled line, the outer flap is likely to be bent at the second ruled line. When the outer flap is bent at the second ruled line, the entire area between the end of the second ruled line and the end of the first ruled line tends to be in a state of being lifted from the body. A gap is likely to occur between the edge of the outer flap and the side edge 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 against the side wall at the first ruled line, it is possible to prevent the outer flap from bending at the second ruled line. . This makes it difficult for a gap to occur between the base end of the outer flap and the body.

In addition, the distance between the point of the second ruled line that protrudes maximum toward the tip 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) must be 10 mm or more. is desirable. When the above-mentioned interval is less than 10 mm, there is a possibility that the effect of reducing the restoring force of the outer flap cannot be sufficiently obtained.
In addition, the distance between the second ruled line that protrudes the most toward the distal end of the outer flap and the first ruled line must be 1/2 or less of the distance from the proximal edge to the distal edge of the outer flap. is desirable. If the above-mentioned interval exceeds 1/2, when trying to fold the outer flap, there is a risk that the second ruled line will break earlier than the first ruled line, which will reduce the workability when closing the lid. There is a risk that it will decline.

In the packaging box described above, the entire second ruled line may be curved in an arc shape, or the second ruled line may be bent at an intermediate portion.

The lid portion of the packaging box described above may be provided with an inner flap that is connected to the vertical edge of the end wall via a third ruled line, and the outer flap may be stacked on the outer surface of the inner flap. In this case, it is preferable to form a fourth ruled line extending in the left-right direction along the third ruled line at the end of the end wall in the vertical direction.

In this configuration, when the inner flap is bent relative to the end wall, the end wall is bent relative to the inner flap at the third ruled line and the fourth ruled line. As a result, the inner flap is bent from a position inside the proximal edge (first ruled line) of the outer flap, and the inner flap is placed inside the body than the outer flap, so the outer flap is folded on the outer surface of the inner flap. It becomes easier to overlap.

According to the packaging box of the present invention, the bent second ruled line is formed at the base end of the outer flap, and the end of the second ruled line is connected to the end of the first ruled line, thereby closing the lid. Sometimes, it becomes difficult to form a gap between the body and the lid.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the packaging box according to the first embodiment of the present invention, viewed from the front upper left. It is a figure showing a blank sheet of a packaging box concerning a first embodiment of the present invention. FIG. 7 is a perspective view of a packaging box according to a second embodiment of the present invention, viewed from the front upper left. It is a figure showing the blank sheet of the packaging box concerning the second embodiment of the present invention.

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In addition, in the description of each embodiment, the same reference numerals will be given to the same components, and duplicate description will be omitted.
In the following description, the front, rear, left, and right directions are set for convenience in explaining the packaging box of this embodiment, and do not limit the configuration or use condition of the packaging box.

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

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 along each ruled line. The blank sheet S1 shown in FIG. 2 is arranged so that the inner surface side can be seen.

The ruled lines of the blank sheet S1 are pressed lines formed by linearly pressing the surface of the blank sheet S1. Note that intermittent cuts may be formed in the ruled lines. This makes it easier to fold the blank sheet S1 along the ruled lines.
Furthermore, the ruled lines may be formed by intermittent half-cut slits that cut only the surface of the sheet or slits that penetrate through the sheet to form a linear shape.

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 wall 11 and the side wall 12 are formed into a rectangle. The end wall 11 and the side wall 12 are vertically connected via ruled lines. In the first embodiment, the cylindrical body portion 10 is formed by attaching the joining piece 13 continuous to the rear edge of the left side wall 12 to the inner surface of the rear end wall 11. Rectangular openings are formed in the upper and lower surfaces of the body 10.

The upper lid part 20 includes a pair of front and rear inner flaps 21, 21 connected to the front and rear end walls 11, 11, respectively, and a pair of left and right outer flaps 22, 22 connected to the left and right side walls 12, 12, respectively. It has .

The inner flap 21 is connected to the upper edge of the end wall 11 via the 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 trunk 10, and the rear inner flap 21 closes the rear part of the upper opening of the trunk 10. The front and rear inner flaps 21, 21 are arranged at intervals in the front-rear direction.

Moreover, a linear fourth ruled line L4 extending in the left-right direction along the third ruled line L3 is formed at the upper end of the inner surface of the end wall 11. The third ruled line L3 and the fourth ruled line L4 are formed with an interval in the vertical direction.

The base end edge of the outer flap 22 is connected to the upper edge of the side wall 12 via the first ruled line L1. The front part of the outer flap 22 is overlapped with the outer surface (upper surface) of the inner flap 21 on the front side, and the rear part of the outer flap 22 is overlapped with the outer surface (upper surface) of the inner flap 21 on the rear side.

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

Then, adhesive tape (not shown) is pasted over the upper end of the outer surface of one end wall 11, the outer surface of the tip edges of both outer flaps 22, 22, and the upper end of the outer surface of the other end wall 11. Thus, the tips of both outer flaps 22, 22 are connected. In this way, the upper lid 20 is closed, and the upper opening of the body 10 is closed by the upper lid 20.

A second ruled line L21 extending in the front-rear direction is formed at the base end (end on the side wall 12 side) of the outer flap 22. The second ruled line L21 is arranged closer to the proximal end than the center portion of the outer flap 22 in the left-right direction.
The second ruled line L21 is a line that is bent so as to protrude toward the distal 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 located at the center of the outer flap 22 in the front-rear direction.
The front and rear ends of the second ruled line L21 are respectively connected to the front and rear ends of the first ruled line L1. That is, the front and rear ends of the second ruled line L21 are connected to the front and rear ends of the upper edge of the side wall 12, respectively.

In the first embodiment, the distance in the left-right direction between the apex of the second ruled line L21 that protrudes maximum toward the distal end side of the outer flap 22 and the first ruled line L1 is set to 10 mm or more. Further, the distance in the left-right direction between the point of the second ruled line L21 that protrudes maximum toward the tip side of the outer flap 22 and the first ruled line L1 is 1/2 or less of the length of the outer flap 22 in the left-right direction. be.

The lower lid part 20 is vertically symmetrical with the upper lid part 20, and as shown in FIG. 2, an inner flap 21 is connected to the lower edge of the end wall 11 via the third ruled line L3. and an outer flap 22 that is connected to the lower edge of the side wall 12 via the first ruled line L1.
Further, at the lower end of the inner surface of the end wall 11, a linear fourth ruled line L4 extending in the left-right direction along the lower third ruled line L3 is formed.
Moreover, a second ruled line L21 curved in an arc shape is also formed at the base end of the outer flap 22 of the lower lid part 20, similarly to the outer flap 22 of the upper lid part 20.

In the packaging box 1A as described above, as shown in FIG. In some cases, the restoring force of the outer flap 22 can be reduced.
As a result, when the outer flap 22 is closed, the distal end portion of the outer flap 22 tends to tilt toward the body 10, so that there is a gap between the edge of the body 10 and the side edge of the outer flap 22. Gaps are less likely to form.

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 against the side wall 12 at the straight first ruled line L1, the second ruled line L21 It is possible to prevent the outer flap 22 from being bent. In the packaging box 1A of the first embodiment, both ends of the second ruled line L21 are connected to both ends of the first ruled line L1, respectively.
In this way, when the outer flap 22 is bent relative to the side wall 12, the entire base end of the outer flap 22 can be prevented from floating relative to the inner flap 21, so that the edge of the trunk 10 can be prevented. It becomes difficult for a gap to occur between the outer flap 22 and the side edge of the proximal end of the outer flap 22.

In the packaging box 1A of the first embodiment, a fourth ruled line L4 is formed at the end of the end wall 11 in the vertical direction along the third ruled line L3 (see FIG. 2). In this configuration, when the inner flap 21 is bent with respect to the end wall 11, the inner flap 21 is 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 is bent from a position on the inner side of the body 10 than the proximal edge (first ruled line L1) of the outer flap 22, and the inner flap 21 is arranged on the inner side of the body 10 than the outer flap 22. Therefore, it becomes easy to overlap the outer flap 22 on the outer surface of the inner flap 21.

Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment, and can be modified as appropriate 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 parts 20, 20 are vertically symmetrically formed, but the structure of the present invention is applied only to one of the upper and lower lid parts. Good too.

Although the lid 20 of the packaging box 1A of the first embodiment is provided with left and right outer flaps 22, 22, the opening of the body 10 may be closed with one outer flap 22. good. Further, the inner flap 21 may not be provided on the lid portion 20.

Although the body 10 of the packaging box 1A of the first embodiment is formed into a rectangular cylindrical shape, the shape of the body 10 is not limited, and an inclined wall is provided between the end wall 11 and the side wall 12. Alternatively, the body portion 10 may be formed into a hexagonal or octagonal cylindrical shape.

[Second embodiment]
Next, the packaging box 1B of the second embodiment will be explained.
As shown in FIG. 3, the packaging box 1B of the second embodiment has substantially the same configuration as the packaging box 1A of the first embodiment (see FIG. 1), and has a second ruled line L21 have different shapes.

The packaging box 1B of the second embodiment is formed by mountain-folding or valley-folding a blank sheet S2 shown in FIG. 4 along each ruled line. The blank sheet S2 shown in FIG. 4 is arranged so that the inner surface side can be seen.

As shown in FIG. 3, the second ruled line L22 of the packaging box 1B of the second embodiment is bent at the center in the front-rear direction. A straight line is formed between the front end of the second ruled line L22 and the bending point, and a straight line is formed between the rear end of the second ruled line L22 and the bending point.

In the packaging box 1B of the second embodiment, similarly to the packaging box 1A of the first embodiment (see FIG. 1), when the outer flap 22 is closed, the tip end portion of the outer flap 22 is on the trunk 10 side. In addition, the entire proximal end portion of the outer flap 22 can be prevented from floating with respect to the inner flap 21. Therefore, also in the packaging box 1B of the second embodiment, a gap is less likely to occur between the edge of the body 10 and the side edge of the outer flap 22.

Although the second embodiment of the present invention has been described above, the present invention is not limited to the second embodiment, and as with the first embodiment, changes can be made as appropriate without departing from the spirit. It is.
In the packaging box 1B of the second embodiment, as shown in FIG. 3, the second ruled line L22 is bent at the center in the front-rear direction, but the position where the second ruled line L22 is bent is not limited. It suffices if it is bent at the middle part of the second ruled line L22.

1A Packaging box (first embodiment)
1B Packaging box (second embodiment)
10 Trunk 11 End wall 12 Side wall 13 Joint piece 20 Lid 21 Inner flap 22 Outer flap L1 First ruled 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 (4)

a cylindrical body having front and rear end walls and left and right side walls;
a lid provided on the upper or lower opening of the body,
The lid portion is
an outer flap connected to the vertical edge of the side wall via a first ruled line;
A second ruled line extending in the front-rear direction is formed at the base end of the outer flap,
The second ruled line is a line bent so as to protrude toward the distal end side of the outer flap,
The packaging box is characterized in that front and rear ends of the second ruled line are respectively connected to front and rear ends of the first ruled line. The packaging box according to claim 1,
A packaging box characterized in that the entire second ruled line is curved in an arc shape. The packaging box according to claim 1,
The packaging box, wherein the second ruled line is bent at a middle portion. The packaging box according to claim 1,
The lid portion is
an inner flap connected to the vertical edge of the end wall via a third ruled line;
The outer flap is superimposed on the outer surface of the inner flap,
A packaging box characterized in that a fourth ruled line extending in the left-right direction along the third ruled line is formed at an end in the vertical direction of the end wall.

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