JP2020050355A - Packaging box - Google Patents

Abstract

To provide a packing box allowing easy height changing work and keeping a top plate in a closed state.SOLUTION: A top plate 30 has a pair of front and rear inner flaps 31, 31 and a pair of lateral outer flaps 32, 32. A butting part of the lateral outer flaps 32, 32 is formed with slits 36. The inner flaps 31 have insertion flaps inserted into the slits 36. The insertion flap has a first insertion flap 33 inserted into the slit 36 when the inner flap 31 and the outer flap 32 are folded at each upper edge part, and a second insertion flap 35 inserted into the slit 36 when folded at folding guide lines 16 passing each end part of cuttable lines ST1-4 provided at ridge line parts of the inner flaps 31 and the outer flaps.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging box capable of changing its content by changing its height.

2. Description of the Related Art Conventionally, as a packaging box of this type, a packaging box described in Patent Literature 1 is known.
The packaging box of Patent Literature 1 has a second fold line on a side surface separated by a predetermined distance from a first fold line that is a boundary position between the side surface and the top surface, and has a vertical line on each boundary line of each side plate. A severable line extending in the direction.

  In this packaging box, the height of the side surface can be changed by setting the boundary position between the side surface and the top surface as the first fold line or the second fold line, and as a result, the inner capacity of the box can be changed.

JP 2014-125237 A

  In the packaging box of Patent Literature 1, for example, when the height of the box is changed to be small, the sheet is cut along a cuttable line extending in the lateral direction to separate the pair of long top plates. For this reason, the operation when changing the height of the packaging box to a small size is complicated. Further, there has been a demand to suppress opening of the top plate (top plate) after forming the packaging box.

  An object of the present invention is to solve the above-mentioned problems and to provide a packaging box that can be easily operated when changing the height and can maintain the top plate in a closed state.

  In order to solve the above problem, a packaging box of the present invention includes a trunk portion including a pair of front and rear end walls and a pair of left and right side walls, a bottom plate closing a lower opening of the trunk portion, And a top plate closing the upper opening. A severable line is formed at each ridge connecting the pair of front and rear end walls and the pair of left and right side walls. The top plate includes a pair of front and rear inner flaps connected to the upper edges of the both end walls, and a pair of left and right outer flaps connected to the upper edges of the both side walls and stacked on the inner flap. Contains. A slit is formed in the butting portion between the pair of left and right outer flaps so as to be orthogonal to the butting portion. The inner flap is provided with an insertion flap that rises from the inner flap, is folded outside the pair of left and right outer flaps, and inserted into the slit. The insertion flap includes a first insertion flap that is inserted into the slit when the inner flap and the outer flap are bent at the respective upper edges. The insertion flap includes a second insertion flap that is inserted into the slit when the inner flap and the outer flap are bent by bending guide lines that pass through respective ends of the severable line.

In the present invention, when forming a packaging box having a large height (having a large internal capacity), the inner flap and the outer flap are bent at their upper edges. At this time, the first insertion flaps of the insertion flaps are raised from the respective inner flaps, and these are folded over the outer flaps and inserted into the slits. As a result, a packaging box having a large height can be obtained.
Further, when forming a packaging box having a small height (small internal capacity), a cutting guide line is cut through each severable line and cut through each end of the inner flap and the outer flap. Fold in. Then, the second insertion flaps of the insertion flaps are raised from the respective inner flaps, and these are folded over the outer flaps and inserted into the slits. Thereby, a packaging box having a small height is obtained.
As described above, according to the present invention, the operation for changing the height is easy.

  Further, in both cases of forming a packaging box having a large height and a packaging box having a small height, the first insertion flap or the second insertion flap is folded outside the outer flap to form a slit. Plugged in. Therefore, after forming the packaging box, the top plate can be suitably maintained in a closed state.

  Further, it is preferable that at least a part of the second insertion flap is provided integrally with the first insertion flap. With this configuration, the second insertion flap can be provided on the inner flap with good space efficiency.

  Further, it is preferable that a projecting piece projecting into the slit is formed in the slit. In this configuration, since the projecting piece comes into contact with the first insertion flap or the second insertion flap inserted into the slit, the first insertion flap or the second insertion flap can be suitably restricted from falling out of the slit. Therefore, the closed state of the top plate can be suitably maintained.

  Further, it is preferable that the first insertion flap can be erected on an upper edge portion of the end wall, and the second insertion flap can be erected on the bending guide line. With this configuration, the overlap margin of the first insertion flap or the second insertion flap with respect to the outer flap can be suitably secured. Therefore, it is possible to more suitably maintain the closed state of the top plate.

  ADVANTAGE OF THE INVENTION In this invention, the operation at the time of changing a height, ie, the operation at the time of changing an internal capacity, is easy, and the packaging box which can maintain a top plate in the closed state is obtained.

It is the perspective view which looked at the packaging box concerning one embodiment of the present invention from the front upper right. It is a figure which shows the blank sheet of the packaging box which concerns on one Embodiment of this invention, and is the top view arrange | positioned so that the inner surface side could be seen. It is an enlarged plan view of a blank sheet showing a part of an inner flap and an outer flap. It is an explanatory view in case a packaging box concerning one embodiment of the present invention is formed in a form with a large height, and is a perspective view showing the state where an inner flap and an outer flap were raised after closing a bottom wall. It is a perspective view which shows the state which bent the inner flap along the upper edge part of the end wall, and raised the 1st insertion flap from the inner flap. It is a perspective view showing the state where the outer flap was bent along the upper edge of the side wall, and the slit was formed over the butted part. It is a perspective view for explaining the slit formed over the butting part. It is explanatory drawing in the case of forming the packaging box which concerns on one Embodiment of this invention in the form with a small height, while bending an end wall along a bending guide line, and raising the 2nd insertion flap. FIG. It is a perspective view showing the state where an outer flap was bent along a ruled line and a slit penetrating both outer flaps was formed. It is the perspective view which looked at the packaging box formed in the small form by inserting the 2nd insertion flap into the slit formed penetrating both outer flaps from the front upper right.

  An embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, the front, rear, left, right, up and down directions are set for convenience in describing the packaging box, and do not limit the configuration and use state of the packaging box.

  As shown in FIG. 1, the packaging box 1 (hereinafter, sometimes simply referred to as “box 1”) includes a body 10 including a pair of front and rear end walls 11 and 12 and a pair of left and right side walls 13 and 14. . In addition, the box 1 includes a bottom plate 20 closing a lower opening of the body 10 and a top plate 30 closing an upper opening of the body 10.

As shown in FIG. 2, the box 1 is formed by folding a blank sheet S obtained by cutting out a single sheet of corrugated cardboard into mountain lines or valleys at each ruled line. The box 1 has a form in which the height of the box 1 is increased as shown in FIG. 1 to increase the internal capacity (large mode), or as shown in FIG. It can be formed in a mode (small mode) with a small amount. Details when forming the box 1 will be described later. The blank sheet S shown in FIG. 2 is arranged so that the inner surface side can be seen.
Hereinafter, the form of the box 1 in the large mode will be described.

As shown in FIG. 2, each ruled line (folded line) separating the end walls 11 and 12, the side walls 13 and 14, the bottom plate 20 (see FIG. 1) and the top plate 30 (see FIG. 1) of the blank sheet S is It is a linear groove formed by pushing the inner surface.
A cut (half-cut line or the like) may be formed in the ruled line. This makes it easier to bend the blank sheet S at the ruled line.

The front end wall 11 is formed in a square as shown in FIG. 1 (see FIG. 2).
A left side wall 13 is connected to the left edge of the front end wall 11 via a ruled line L1 (see FIG. 2).
The left side wall 13 extends rearward from the left edge of the front end wall 11. The left side wall 13 is formed at right angles to the front end wall 11. The left side wall 13 is formed in a square shape.

  The ridge (corner) between the front end wall 11 and the left side wall 13 is composed of a ruled line L1 and a cuttable line ST1 that is continuous with the upper end (one end) of the ruled line L1. The front end wall 11 and the left side wall 13 are continuous via the ruled line L1 and the cuttable line ST1.

The rear end wall 12 is connected to the rear edge of the left side wall 13 via a ruled line L2 (see FIG. 2).
The rear end wall 12 extends rightward from the rear edge of the left side wall 13. The rear end wall 12 is formed at right angles to the left side wall 13. The rear end wall 12 has the same shape as the front end wall 11.

  The ridge (corner) between the left side wall 13 and the rear end wall 12 is composed of a ruled line L2 and a cuttable line ST2 that is continuous with the upper end (one end) of the ruled line L2. The left side wall 13 and the rear end wall 12 are continuous via the ruled line L2 and the cuttable line ST2.

A right side wall 14 is connected to the right edge of the rear end wall 12 via a ruled line L3 (see FIG. 2).
The right side wall 14 extends forward from the right edge of the rear end wall 12. The right side wall 14 is formed at right angles to the rear end wall 12. The right side wall 14 has the same shape as the left side wall 13.

  The ridge (corner) between the rear end wall 12 and the right side wall 14 is composed of a ruled line L3 and a cuttable line ST3 that is continuous with the upper end (one end) of the ruled line L3. The rear end wall 12 and the right side wall 14 are continuous via a ruled line L3 and a cuttable line ST3.

A joining piece 15 is continuously provided on the front edge of the right side wall 14 via a ruled line L4 (see FIG. 2). The joining piece 15 is formed in a band shape along the front edge of the right side wall 14.
The joining piece 15 is a part joined to the right end of the inner surface of the front end wall 11 by an adhesive.

  The ridge (corner) between the right side wall 14 and the front end wall 11 is composed of a ruled line L4 and a cuttable line ST4 that is continuous with the upper end (one end) of the ruled line L4. The right side wall 14 and the front end wall 11 are continuous via the joint piece 15 via the ruled line L4 and the cuttable line ST4.

  The severable lines ST1 to ST4 are cut when forming a small height (small content) box 1 as described later. Thereby, each height of the front end wall 11, the rear end wall 12, the left side wall 13, and the right side wall 14 of the box 1 can be changed to be small, and as a result, the height of the box 1 becomes small.

  On the inner surfaces of the front end wall 11, the rear end wall 12, the left side wall 13, the right side wall 14, and the joining piece 15, one bending guide line 16 extending in the longitudinal direction of each wall is formed as shown in FIG. ing. The bending guide line 16 passes through the lower end of each of the cuttable lines ST1 to ST4 (the upper end of the ruled lines L1 to L4) and extends to each wall and the joint piece 15.

  The above-described blank sheet S (see FIG. 2) is bent along the ruled lines L <b> 1 to L <b> 4, and the joining pieces 15 are joined to the right inner surface of the front end wall 11, so that the front end wall 11, the left side wall 13, the rear end wall 12 and The right side wall 14 forms a square tubular body 10 (see FIG. 1).

As shown in FIG. 1, the bottom plate 20 includes front and rear bottom inner flaps 21 and 21 and left and right bottom outer flaps 22 and 22. As shown in FIG. 2, the front inner flaps 21 and 21 are connected to lower edges of the front and rear end walls 11 and 12 via ruled lines L5 and L6. The left and right bottom outer flaps 22, 22 are connected to lower edges of the left and right side walls 13, 14 via ruled lines L7, L8.
As shown in FIG. 1, the bottom plate 20 is formed by arranging a pair of left and right bottom outer flaps 22, 22 under the pair of front and rear bottom inner flaps 21, 21. The inner bottom flaps 21, 21 and the outer bottom flaps 22, 22 are joined by an adhesive tape 20a or an adhesive.

The upper opening of the body 10 is closed by a top plate 30. The top plate 30 includes a pair of front and rear inner flaps 31, 31 and a pair of left and right outer flaps 32, 32.
As shown in FIG. 2, the front inner flap 31 is connected to the upper edge of the front end wall 11 via a ruled line L9. The front inner flap 31 extends rearward from the upper edge of the front end wall 11, as shown in FIG. The front inner flap 31 is formed at right angles to the front end wall 11.

  As shown in FIG. 3, a first insertion flap 33 is formed at the center of the front inner flap 31 in the left-right direction. The first insertion flap 33 is partitioned into a substantially square shape inside the front inner flap 31 by the cutting guide line L10. The cutting guide line L10 extends in a substantially gate shape starting from the upper edge portion (ruled line L9) of the front end wall 11. The cutting guide line L10 is a perforated line in which cuts are formed intermittently. The interval between cuts of the cutting guide line L10 can be set arbitrarily.

The first insertion flap 33 is caused from the inner flap 31 by cutting open the cutting guide line L10, and can be erected on the upper edge of the front end wall 11 at a right angle to the inner flap 31 (flush with the front end wall 11). (See FIG. 5). Then, as shown in FIG. 1, the first insertion flap 33 is folded over a butt portion at the center of the front end of the outer surface of the pair of left and right outer flaps 32.
The first insertion flap 33 has a width W1 smaller than the width of the inner flap 31, as shown in FIG.

  The first insertion flap 33 is divided into two regions by a bending guide line L11 parallel to the ruled line L9. The first insertion flap 33 can be bent at the bending guide line L11. The insertion piece 34, which is one of the two regions of the first insertion flap 33, is folded down below the outer flap 32 via the bending guide line L <b> 11, and slits 36, 36 described later on the outer flaps 32, 32. (See FIG. 1).

A second insertion flap 35 is formed at a portion extending from a central portion in the left-right direction at the upper portion of the front end wall 11 to a central portion in the left-right direction of the first insertion flap 33 continuous therewith. The second insertion flap 35 is formed into a substantially tongue-like shape by the cutting guide line L12. The cutting guide line L12 extends in a substantially U-shape with the bent guide line 16 of the front end wall 11 as a starting point, and includes straight and bent line cut lines. The distal end portion 35a of the second insertion flap 35 is held by the first insertion flap 33 via a total of three connecting portions 35b, and is provided integrally with the first insertion flap 33.
The second insertion flap 35 has a width W2 smaller than the width W1 of the first insertion flap 33.
Such a second insertion flap 35 can be erected on the bent guide line 16 when forming a small box 1 as described later.

  As shown in FIGS. 2 and 3, in the state of the blank sheet S, the first insertion flap 33 and the second insertion flap 35 are formed in a single plate shape with the inner flap 31.

  As shown in FIG. 2, the rear inner flap 31 is connected to the upper edge of the rear end wall 12 via a ruled line L13. The rear inner flap 31 has a shape that is symmetrical in the front-rear direction with respect to the front inner flap 31, and extends forward from the upper edge (ruled line L13) of the rear end wall 12, as shown in FIG. . The rear inner flap 31 is formed at right angles to the rear end wall 12.

  As shown in FIG. 2, a first insertion flap 33 is formed on the rear inner flap 31 as well as the front inner flap 31. Similarly, the first insertion flap 33 on the rear side is provided with an insertion piece 34. Further, a second insertion flap 35 formed from an upper portion of the rear end wall 12 is formed on the rear inner flap 31 similarly to the front side.

As shown in FIG. 1, the left outer flap 32 is connected to the upper edge of the left side wall 13 via a ruled line L14. The left outer flap 32 extends rightward from the upper edge of the left side wall 13. The left outer flap 32 is formed perpendicular to the left side wall 13.
The front and rear ends of the left outer flap 32 are superimposed on the left upper surfaces of the front and rear inner flaps 31, 31.

  A slit 36 is formed at the tip edge (right edge) of the left outer flap 32. As shown in FIG. 5, a pair of slits 36 are formed at intervals in the front-rear direction. As will be described later, the slits 36, 36 are formed at positions where the insertion pieces 34, 34 of the insertion flaps 33, 33 to be superimposed on the outer surface of the outer flap 32 can be inserted. The slit 36 extends leftward from the leading edge of the outer flap 32 (see FIGS. 2, 6, and 7). The insertion pieces 34, 34 are inserted into both slits 36, 36 (see FIG. 1).

  The front and rear width of the slit 36 corresponds to the thickness of the blank sheet S. As shown in FIG. 3, the width of the slit 36 is set to a width of W1 / 2 which is half the width W1 of the first insertion flap 33.

A rectangular projecting piece 37 is arranged in the slit 36 via a bending guide line L37. The bending guide line L37 is formed by a perforated cut line. When the insertion piece 34 of the insertion flap 33 is inserted into the slit 36, the protruding piece 37 is pressed by the insertion piece 34 and is bent toward the lower side of the outer flap 32, so that the facing surface of the insertion piece 34 is Press.
Note that the protruding pieces 37 are not limited to those having a square shape, but may have various shapes.

  As shown in FIG. 1, a first insertion flap 33 is superimposed on front and rear ends of the left outer flap 32. That is, the butted portion of the outer flap 32 and the front and rear ends are sandwiched between the inner flap 31 and the first insertion flap 33 from above and below.

  At the front and rear edges of the outer flap 32, notches 38, 38 are formed as shown in FIG. The notches 38, 38 are formed continuously with the slits 36, 36.

  As shown in FIG. 1, the right outer flap 32 is connected to the upper edge of the right side wall 14 via a ruled line L15. The right outer flap 32 has a symmetrical shape with respect to the left outer flap 32, and extends leftward from the upper edge of the right wall 14. The right outer flap 32 is formed at right angles to the right side wall 14.

  Similarly to the left outer flap 32, the right outer flap 32 is formed with a pair of slits 36 in the front-rear direction. The two slits 36 in the right outer flap 32 correspond to the two slits 36 in the left outer flap 32. Notches 38, 38 are also formed in the outer flap 32 on the right side.

When forming the box 1 having a large height, the left and right outer flaps 32, 32 have their ends abutted at the center in the left-right direction, as shown in FIGS.
Thereby, in the box 1 having a large height, as shown in FIGS. 6 and 7, one long slit 36A that is continuous in the left-right direction is formed. Since the width of the slit 36 alone is W1 / 2 (see FIG. 3) as described above, the width of the slit 36A, which is two lengths, is the same as the width W1 of the width of the first insertion flap 33. Become. Therefore, the insertion piece 34 of the first insertion flap 33 can be inserted into the slit 36A (see FIG. 1).

On the other hand, the left and right outer flaps 32, 32 are configured such that when forming the small box 1, the ends thereof overlap each other at the center in the left-right direction as shown in FIG.
Thereby, in the small box 1, as shown in FIG. 9, one short slit 36 </ b> B that is continuous in the left-right direction is formed. The slit 36B communicates in the up-down direction at the overlapping portion. The width of the slit 36B is formed to be the same width W2 as the width of the second insertion flap 35. Therefore, the tip 35a of the second insertion flap 35 can be inserted into the slit 36B (see FIG. 10).

Next, a procedure for forming the box 1 will be described. In the following procedure, the bending order of the front and rear inner flaps 31, 31 and the bending order of the left and right outer flaps 32, 32 are not particularly limited.
First, a procedure for forming a small height (large content) box 1 will be described.
First, the body 10 is formed from the state of the blank sheet S (see FIG. 2).
Subsequently, as shown in FIG. 4, the inner bottom flaps 21 and 21 and the outer bottom flaps 22 and 22 are closed, and the lower opening of the body 10 is closed with the bottom plate 20. The bottom plate 20 is closed using an adhesive tape 20a or an adhesive. In the case of storing the contents in the box 1, the operation is performed through the upper opening of the open body 10.

  Subsequently, as shown in FIG. 5, both inner flaps 31, 31 are bent along the upper edges of the front and rear end walls 11, 12. Then, the first insertion flaps 33, 33 are separated and raised from the inner flaps 31, 31 via the ruled lines L9, L13 of the inner flaps 31, 31 and the cutting guide lines L10, L10.

  Thereafter, as shown in FIG. 6, the outer flaps 32 are bent along the upper edges of the left and right side walls 13 and 14, and these are overlapped on the inner flaps 31. As a result, the leading edge portions of the outer flaps 32 are abutted against each other.

Then, as shown in FIG. 7, the first insertion flap 33 on the rear side in the raised state is bent toward the notches 38, 38 of the outer flaps 32, 32, and the insertion piece 34 is bent, and this is slit. Insert into 36A. Then, the insertion piece 34 is inserted into the slit 36A so as to push the projecting pieces 37, 37 of the slit 36A downward. Thereby, the insertion piece 34 is held by the slit 36A. The same operation is performed for the first insertion flap 33 on the front side.
In this manner, the upper opening of the body 10 is closed by the top plate 30, and the box 1 having a large height is formed.

Next, a procedure for forming the box 1 having a small height (small content) will be described. Also in this case, similarly to the above, the trunk portion 10 is formed from the state of the blank sheet S (see FIG. 2), and the bottom plate 20 is closed.
Subsequently, as shown in FIG. 8, the cuttable lines ST <b> 1 to ST <b> 4 of each corner are cut, and the upper portions of the end walls 11, 12 and both inner flaps 31, 31 connected to the upper portions of the end walls 11, 12 along the bending guide line 16. Bends together. Then, the second insertion flaps 35, 35 are cut off via the bending guide lines 16, 16 and the cutting guide lines L12, L12, and these are raised at right angles from the inner flaps 31, 31.

  Thereafter, as shown in FIG. 9, the upper portions of the left and right end walls 13 and 14 and the outer flaps 32 continuous with the upper end walls 13 and 14 are integrally bent along the bending guide line 16, and the outer flaps 32 and 32 are joined together. Overlap at the center in the left-right direction. Then, the slits 36 of the outer flaps 32 overlap in the vertical direction, and a slit 36B having the same width W2 as the width W2 of the second insertion flap 35 is opened on the upper surface of the outer flap 32.

Subsequently, the end portions 35a, 35a of the second insertion flaps 35, 35 in the raised state are bent and inserted into the formed slits 36B, 36B as shown in FIG. Then, the tip portions 35a, 35a are inserted into the slit 36B so as to push the respective projecting pieces 37 of the slit 36B downward. Thereby, each tip 35a is held by the slit 36B.
In this manner, the upper opening of the body 10 is closed by the top plate 30, and the small box 1 is formed.

In the present embodiment described above, the operation for forming the box 1 having a large height (large content) and the operation for forming the box 1 having a small height (small content) are easy. .
Therefore, the present invention is suitable for accommodating items such as cutlery and fruits, flowers, etc., whose heights change depending on growth.

  When forming the box 1 having a large height, the first insertion flap 33 is folded outside the outer flap 32 and inserted into the slit 36A. Further, when forming the small box 1, the second insertion flap 35 is folded outside the outer flap 32 and inserted into the slit 36 </ b> B. Therefore, after the box 1 is formed, the top plate 30 can be suitably maintained in a closed state.

  Further, since the second insertion flap is partially provided integrally with the first insertion flap 33, the second insertion flap 35 can be provided on the inner flap 31 with good space efficiency.

  Further, since the protruding piece 37 is formed in the slit 36, it is possible to preferably restrict the first insertion flap 33 or the second insertion flap 35 from coming out of the slit 36. Therefore, the top plate 30 can be suitably maintained in the closed state.

  The first insertion flap 33 is raised from the upper edge of the inner flap 31, and the second insertion flap 35 is raised from the bending guide line 16. Therefore, the overlap margin of the first insertion flap 33 or the second insertion flap 35 on the outer flap 32 can be suitably secured. Therefore, the top plate 30 can be more suitably maintained in the closed state.

As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments, and can be appropriately changed without departing from the gist of the present invention.
For example, the width W1 of the first insertion flap 33 and the width W2 of the second insertion flap 35 can be formed as appropriate. In this case, the first insertion flap 33 and the second insertion flap 35 may be formed in a shape in which the front end side is wider than the start end side. By forming in this manner, the first insertion flap 33 or the second insertion flap 35 can be more appropriately prevented from coming off from the slit 36.

  In addition, a locking hook or the like that is locked to the slit 36 with respect to the first insertion flap 33 or the second insertion flap 35 may be provided.

  Although the box 1 of the present embodiment is made of corrugated cardboard, the box may be formed of various known paperboards.

1 packing box (box)
10 torso 11 end wall (front end wall)
12 End wall (rear end wall)
13 Side wall (left side wall)
14 Side wall (right side wall)
16 Folding guide wire 20 Bottom plate 30 Top plate 31 Inner flap 32 Outer flap 33 First insertion flap 35 Second insertion flap 36 Slit 36A Slit 36B Slit 37 Projecting piece

Claims (4)

A trunk portion comprising a pair of front and rear end walls and a pair of left and right side walls,
A bottom plate closing the lower opening of the trunk,
A top plate closing the upper opening of the trunk,
A cuttable line formed at each ridge portion connecting the pair of front and rear end walls and the pair of left and right side walls,
The top plate is
A pair of front and rear inner flaps connected to the upper edges of the end walls,
A pair of left and right outer flaps that are connected to the upper edges of the side walls and overlapped with the inner flap,
A slit is formed at a butt portion between the pair of left and right outer flaps so as to be orthogonal to the butt portion,
The inner flap is provided with an insertion flap that is raised from the inner flap, folded over the pair of left and right outer flaps and inserted into the slit,
The insertion flap is
A first insertion flap inserted into the slit when the inner flap and the outer flap are bent at the respective upper edges;
A second insertion flap inserted into the slit when the inner flap and the outer flap are bent by a bending guide line passing through each end of the severable line.   2. The packaging box according to claim 1, wherein at least a part of the second insertion flap is provided integrally with the first insertion flap. 3.   3. The packaging box according to claim 1, wherein the slit has a projecting piece projecting into the slit. 4. The first insertion flap can be erected on an upper edge of the end wall,
The packaging box according to any one of claims 1 to 3, wherein the second insertion flap can be erected on the bending guide line.

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