JP7697408B2 - packaging box - Google Patents

Description

The present invention relates to a packaging box.

In Type A cardboard packaging boxes, outer flaps are connected to the upper and lower edges of the body via lines, and the lid is formed by folding the outer flaps over the body and connecting the tips of the left and right outer flaps together with adhesive tape (see, for example, Patent Document 1).

JP 2022-055346 A

In the conventional packaging boxes described above, when the outer wrap is folded over the body and the tips of the left and right outer flaps are connected together with adhesive tape, the outer flaps tend to return to their original shape due to their restoring force, which can result in a large gap being created between the edge of the body and the inner surface of the outer flaps.

The present invention aims to solve the above problems and provide a packaging box that is less likely to produce 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 comprising 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 has an outer flap connected to the vertical edge of the side wall via a straight first crease. A second crease extending in the front-rear direction is formed at the base end of the outer flap. The second crease is a line bent so as to protrude toward the tip side of the outer flap. The front and rear ends of the second crease are connected to the front and rear ends of the first crease, respectively.

In the packaging box of the present invention, by forming a second crease at the base end of the outer flap, the restoring force of the outer flap can be reduced when the outer flap is folded against the side wall at the first crease. As a result, when the outer flap is closed, the tip side of the outer flap tends to tilt toward the body, making it less likely that a gap will occur between the edge of the body and the side edge of the outer flap.

If the end of the second crease is separated from the end of the first crease, when the outer flap is folded against the body, the entire area between the end of the second crease and the end of the first crease tends to be raised above the body, and 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 contrast, in the packaging box of the present invention, the end of the second crease is connected to the end of the first crease, so a gap is less likely to occur between the base end of the outer flap and the body.

Furthermore, if the second score line is a straight line, when the outer flap is folded against the side wall at the first score line, the outer flap is likely to bend at the second score line. When the outer flap is bent at the second score line, the entire area between the end of the second score line and the end of the first score line is likely to be raised above the body, and 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 crease is a curved line, when the outer flap is folded against the side wall at the first crease, the outer flap can be prevented from bending at the second crease, which 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 first crease and the point at which the second crease protrudes most toward the tip of the outer flap (the maximum width between the second crease and the first crease in the left-right direction) is preferably 10 mm or more. If the distance is less than 10 mm, there is a risk that the effect of reducing the restoring force of the outer flap will not be sufficiently obtained.
In addition, the distance between the first score line and the point at which the second score line protrudes most toward the tip of the outer flap is preferably equal to or less than half the distance from the base edge to the tip edge of the outer flap. If the distance exceeds half, there is a risk that the second score line will break before the first score line when attempting to fold the outer flap, which may reduce the ease of operation when closing the lid.

In the packaging box described above, the entire second crease may be curved in an arc, or the second crease may be bent in the middle.

The lid of the packaging box may be provided with an inner flap connected to the vertical edge of the end wall via a third crease, and the outer flap may be overlapped on the outer surface of the inner flap. In this case, it is preferable to form a fourth crease extending in the left- right direction along the third crease at the vertical end of the end wall at a position spaced apart in the vertical direction from the vertical edge of the end wall.

In this configuration, when the inner flap is folded against the end wall, the end wall is folded against the inner flap at the third and fourth creases. As a result, the inner flap is folded from a position inside the base edge of the outer flap (first crease), and the inner flap is positioned inside the body of the outer flap, making it easier to overlap the outer surface of the inner flap.

According to the packaging box of the present invention, by forming a bent second crease at the base end of the outer flap and connecting the end of the second crease to the end of the first crease, a gap is less likely to occur between the body and the lid when the lid is closed.

1 is a perspective view of a packaging box according to a first embodiment of the present invention, viewed from the upper left front side. FIG. 1 is a diagram showing a blank sheet for a packaging box according to a first embodiment of the present invention. FIG. FIG. 11 is a perspective view of a packaging box according to a second embodiment of the present invention, as viewed from the upper front left. FIG. 11 is a diagram showing a blank sheet for a packaging box according to a second embodiment of the present invention.

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 description of each embodiment, the same components are denoted by the same reference numerals, and duplicate descriptions will be omitted.
In the following description, the front, rear, left and right directions are set for the sake of convenience in describing the packaging box of this embodiment, and do not limit the configuration or usage state of the packaging box.

[First embodiment]
1, the packaging box 1A of the first embodiment includes a rectangular tubular body 10, an upper lid 20 closing an upper opening of the body 10, and a lower lid 20 closing an opening of a lower side of the body 10. The packaging box 1A of the first embodiment is an A-type 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 cut out from a cardboard sheet at each line. The blank sheet S1 shown in FIG. 2 is positioned so that the inner side is visible.

The creases on the blank sheet S1 are formed by pressing the surface of the blank sheet S1 linearly. Note that the creases may be formed with intermittent cuts. In this way, it becomes easier to fold the blank sheet S1 at the creases.
Moreover, the ruled lines may be formed by forming intermittent linear cuts, such as half-cut cuts made by cutting only the surface of the sheet, or cuts that penetrate the sheet.

As shown in FIG. 1, 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 end walls 11 and the side walls 12 are formed in a rectangular shape. The end walls 11 and the side walls 12 are connected vertically via a ruled line. In the first embodiment, the cylindrical body 10 is formed by attaching a joint piece 13 connected to the rear edge of the left side wall 12 to the inner surface of the rear end wall 11. A rectangular opening is formed on the upper and lower surfaces of the body 10.

The upper lid portion 20 has 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.

The inner flap 21 is connected to the upper edge of the end wall 11 via a third line L3. The third line L3 is a straight 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 covers the front portion of the upper opening of the torso 10, and the rear inner flap 21 covers the rear portion of the upper opening of the torso 10. The front and rear inner flaps 21, 21 are disposed with a gap between them in the front-to-rear direction.

A fourth straight line L4 is formed at the top end of the inner surface of the end wall 11, extending in the left-right direction along the third line L3. The third line L3 and the fourth line L4 are formed with a gap between them in the up-down direction.

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

The left outer flap 22 covers the left half of the upper opening of the body 10 , and the right outer flap 22 covers the right half of the upper opening of the body 10 .
The leading edge portions of the left and right outer flaps 22, 22 are butted against each other at the left-right center of the upper opening of the body portion 10.

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

A second crease L21 extending in the front-rear direction is formed on the base end (the end on the side wall 12 side) of the outer flap 22. The second crease L21 is disposed closer to the base end than the center of the outer flap 22 in the left-right direction.
The second crease L21 is a curved line that protrudes toward the tip side of the outer flap 22. In the first embodiment, the entire second crease L21 is curved in an arc shape. The apex of the second crease L21 is located in the center of the outer flap 22 in the front-rear direction.
The front and rear ends of the second creased line L21 are connected to the front and rear ends of the first creased line L1, respectively. In other words, the front and rear ends of the second creased line L21 are connected to the front and rear ends of the upper edge portion of the side wall 12, respectively.

In the first embodiment, the left-right distance between the apex of the second line L21 that protrudes most toward the tip of the outer flap 22 and the first line L1 is set to 10 mm or more. In addition, the left-right distance between the point of the second line L21 that protrudes most toward the tip of the outer flap 22 and the first line L1 is 1/2 or less of the left-right length of the outer flap 22.

The lower lid portion 20 is configured symmetrically to the upper lid portion 20, and as shown in Figure 2, has an inner flap 21 connected to the lower edge of the end wall 11 via a third score line L3, and an outer flap 22 connected to the lower edge of the side wall 12 via a first score line L1.
A straight fourth crease L4 is formed on the lower end of the inner surface of the end wall 11, extending in the left-right direction along the lower third crease L3.
Similarly to the outer flap 22 of the upper lid portion 20, a second curved line L21 is formed at the base end of the outer flap 22 of the lower lid portion 20, which is curved in an arc shape.

In the packaging box 1A described above, by forming a second line L21 at the base end of the outer flap 22 as shown in Figure 1, the restoring force of the outer flap 22 when the outer flap 22 is folded against the side wall 12 at the first line L1 can be reduced.
As a result, when the outer flap 22 is closed, the tip portion of the outer flap 22 is more likely to tilt toward the torso 10, making it less likely that a gap will occur between the edge of the torso 10 and the side edge of the outer flap 22.

In the packaging box 1A of the first embodiment, the second crease L21 is a curved line, so that when the outer flap 22 is folded at the linear first crease L1 toward the side wall 12, the outer flap 22 can be prevented from bending at the second crease L21. Also, in the packaging box 1A of the first embodiment, both ends of the second crease L21 are connected to both ends of the first crease L1, respectively.
In this way, when the outer flap 22 is folded against the side wall 12, the entire base end of the outer flap 22 can be prevented from floating relative to the inner flap 21, making it less likely that a gap will occur between the edge of the body 10 and the side edge of the base end of the outer flap 22.

In the packaging box 1A of the first embodiment, a fourth line L4 is formed along the third line L3 at the top-bottom end of the end wall 11 (see FIG. 2). In this configuration, when the inner flap 21 is folded against the end wall 11, the inner flap 21 is folded against the end wall 11 at the third line L3 and the fourth line L4.
As a result, the inner flap 21 bends from a position inside the torso 10 further inside the base edge (first line L1) of the outer flap 22, and the inner flap 21 is positioned inside the torso 10 further inside the outer flap 22, making it easier 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 appropriately modified without departing from the spirit of the present invention.
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 in the up-down direction, but the configuration of the present invention may be applied to only one of the upper and lower lid portions.

The lid portion 20 of the packaging box 1A in the first embodiment is provided with left and right outer flaps 22, 22, but it may be configured so that a single outer flap 22 covers the opening of the body portion 10. Also, the lid portion 20 does not need to be provided with an inner flap 21.

The body 10 of the packaging box 1A in the first embodiment is formed in a rectangular cylindrical shape, but the shape of the body 10 is not limited thereto, and the body 10 may be formed in a hexagonal or octagonal cylindrical shape by providing an inclined wall between the end wall 11 and the side wall 12.

[Second embodiment]
Next, a packaging box 1B according to a second embodiment will be described.
As shown in Figure 3, the packaging box 1B of the second embodiment has a configuration that is approximately the same as the packaging box 1A of the first embodiment (see Figure 1), but the shape of the second line L21 formed on the outer flap 22 is different.

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 line. The blank sheet S2 shown in FIG. 4 is positioned so that the inner side is visible.

The second crease L22 of the packaging box 1B of the second embodiment is bent in the center in the front-to-rear direction as shown in FIG. 3. The front end of the second crease L22 is formed in a straight line between the bending point and the front end of the second crease L22, and the rear end of the second crease L22 is formed in a straight line between the bending point and the front end of the second crease L22.

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 portion of the outer flap 22 is easily tilted toward the body 10, and the entire base end portion of the outer flap 22 is prevented from floating relative to the inner flap 21. Therefore, in the packaging box 1B of the second embodiment as well, gaps are less likely to occur between the edge of the body 10 and the side edge of the outer flap 22.

The above describes the second embodiment of the present invention. However, the present invention is not limited to the second embodiment, and similarly to the first embodiment, it can be modified appropriately without departing from the spirit of the present invention.
In the packaging box 1B of the second embodiment, as shown in FIG. 3, the second line L22 is bent in the center in the front-to-rear direction, but the position at which the second line L22 is bent is not limited, and it is sufficient that the second line L22 is bent in the middle.

1A Packaging box (first embodiment)
1B Packaging box (second embodiment)
REFERENCE SIGNS LIST 10 Body portion 11 End wall 12 Side wall 13 Joint piece 20 Lid portion 21 Inner flap 22 Outer flap L1 First crease L21 Second crease (first embodiment)
L22 Second ruled line (second embodiment)
L3: Third line L4: Fourth line S1: Blank sheet (first embodiment)
S2 Blank sheet (second embodiment)

Claims (4)

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

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