JP7609056B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box.

In recent years, cardboard packaging boxes have been widely used as packaging boxes for online shopping and the like, and various products are delivered in these boxes. On the other hand, there is an increasing demand to store packaging boxes for reuse after opening them.
Generally, after opening, the packaging box can be folded flat, so it is ideal to stock the folded sheet bodies, and it is convenient to have a stock box to store them. However, the folded sheet body is longer than one side of the box. For this reason, a box with a long opening width of the cylindrical body or a box whose opening width can be changed to a long size is required to store the sheet body.

A conventional packaging box that allows the opening width of the body to be changed to a longer length is disclosed in Patent Document 1. This packaging box has a folding line for changing the shape, and the opening width of the body can be changed to a longer length by folding along the folding line.

JP 2007-204122 A

The conventional packaging boxes mentioned above could change the width of the opening of the body to a longer length by folding along the fold lines, but there was a demand to change the shape to a longer length in order to further improve the storage of the folded sheet body.

The present invention aims to solve the above problems and provide a packaging box in which the opening width of the body can be changed to a longer length and which has excellent storage properties for the folded sheet body.

In order to solve the above problem, the packaging box of the present invention includes a body portion consisting of a pair of front and rear side walls and a pair of left and right end walls, and a bottom wall connected to the lower edge of the body portion. The bottom wall has a pair of front and rear lower flaps connected to the lower ends of the pair of front and rear side walls, and a pair of left and right lower end flaps connected to the lower ends of the pair of left and right end walls and overlapping the upper surfaces of the pair of front and rear lower flaps. The left end wall has a left bend guiding line extending in the vertical direction at a position shifted in one direction from the center in the front and rear direction, and the right end wall has a right bend guiding line extending in the vertical direction at a position shifted in the other direction from the center in the front and rear direction. The left lower end flap has a left break guiding line extending in the horizontal direction corresponding to the left bend guiding line, and the right lower end flap has a right break guiding line extending in the horizontal direction corresponding to the right bend guiding line . A left inclined fold guide line is formed on the left lower end flap, extending diagonally to the other side in the front-to-rear direction from the middle of the left break guide line toward the right edge of the left lower end flap, and a right inclined fold guide line is formed on the right lower end flap, extending diagonally to one side in the front-to-rear direction from the middle of the right break guide line toward the left edge of the right lower end flap.

In the packaging box of the present invention, when the opening width of the body is changed to a longer length, the left and right bottom flaps are cut open along the left and right break guiding lines, and the left and right end walls are folded along the left and right bend guiding lines. This causes the folding positions of the left and right end walls to be shifted from the center in the front-to-rear direction to one side and the other side in the front-to-rear direction, and the left and right end walls can be made to protrude to the left and right sides compared to when the left and right end walls are folded at the center in the front-to-rear direction of the left and right end walls. As a result, the packaging box can be changed to a shape in which the opening width of the body is longer in the left-to-right direction than in the normal use state. This results in excellent stockability of the sheet body in the folded state.

In addition , when changing the shape of the packaging box to a long shape, the left bottom end flap is folded along the left inclined folding guide line, so that the area of the flap piece on the other side in the front-rear direction that is to be separated along the left break guide line can be reduced when viewed in plan. In addition, the right bottom end flap is folded along the right inclined folding guide line, so that the area of the flap piece on one side in the front-rear direction that is to be separated along the right break guide line can be reduced when viewed in plan. As a result, in the left bottom end flap, the flap piece on the other side in the front-rear direction that is to be separated along the left break guide line can be brought closer to, for example, the inner surface of the rear side wall, and in the right bottom end flap, the flap piece on one side in the front-rear direction that is to be separated along the right break guide line can be brought closer to, for example, the inner surface of the front side wall. As a result, the left and right end walls can be further protruded to the left and right sides, and as a result, the packaging box can be changed to a shape in which the opening width of the body is longer in the left-right direction.

In addition, it is preferable that, in the left bottom end flap, the flap piece on one side in the front-to-rear direction that is to be separated by the left break guiding line is attached to the left part of the lower flap that overlaps it, and, in the right bottom end flap, the flap piece on the other side in the front-to-rear direction that is to be separated by the right break guiding line is attached to the right part of the lower flap that overlaps it.

With this configuration, the overlapping state of the flaps at the attached portions is maintained, so that portion has excellent shape retention and it is easy to change the packaging box into a longer shape.

In addition, when the top wall is connected to the upper edge of the body, it is preferable that the top wall has a pair of front and rear upper flaps connected to the upper ends of the pair of side walls, and a pair of left and right upper end flaps connected to the upper ends of the pair of end walls. It is preferable that the left upper end flap has a left upper end fold guiding line extending in the left-right direction that functions as a fold guiding line continuing from the left fold guiding line, and the right upper end flap has a right upper end fold guiding line extending in the left-right direction that functions as a fold guiding line continuing from the right fold guiding line.

With this configuration, when changing the opening width of the body of the packaging box to a longer length, the left top flap can be folded in succession to the left bend guide line, and the right top flap can be folded in succession to the right bend guide line. Therefore, even packaging boxes that have a top wall can be changed to a longer shape.

The packaging box of the present invention allows the opening width of the body to be changed to a longer length, and has excellent storage properties for the folded sheet body.

1 is a perspective view showing a packaging box according to an embodiment of the present invention. FIG. 2 is a diagram showing a blank sheet for a packaging box according to one embodiment of the present invention. FIG. 11 is a perspective view showing a first modified shape of the packaging box according to an embodiment of the present invention. FIG. 11 is a perspective view showing a second modified shape of the packaging box according to one embodiment of the present invention. FIG. 2 is a plan view showing the bottom surface of the packaging box according to one embodiment of the present invention. 1 is a plan view showing a bottom surface of a packaging box according to a first modified shape of an embodiment of the present invention; FIG. 10A to 10C are plan views showing a procedure for changing the packaging box according to one embodiment of the present invention from a first modified shape to a second modified shape. 13 is a plan view showing a bottom surface of a packaging box according to a second modified shape of an embodiment of the present invention. FIG.

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 following description, the front, rear, left, right, top and bottom directions are based on the directions shown in FIG.

As shown in FIG. 1, the packaging box 1 of this embodiment is an A-type box, and is a rectangular parallelepiped whose left-right length is greater than its front-rear length. The packaging box 1 has a cylindrical body 10, a top wall 20 formed at the upper opening of the body 10, and a bottom wall 30 formed at the lower opening. The top wall 20 serves as a lid that closes the upper opening, and the bottom wall 30 serves as a lid that closes the lower opening. The packaging box 1 of this embodiment can be changed into a first modified shape (see FIG. 3) and a second modified shape (see FIG. 4), as described below.

The packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S cut out from a single sheet of cardboard at each of the ruled lines, as shown in Fig. 2. The blank sheet S shown in Fig. 2 is arranged so that the outer surface is visible, but for ease of explanation, each ruled line formed on the inner surface is shown by a solid line.
Each crease (fold line) of the blank sheet S is a linear groove (crease) formed by pressing into the surface of the blank sheet S. Note that a notch (half-cut line, etc.) may be formed in the crease. In this way, it becomes easier to fold the blank sheet S at the crease.

When the packaging box is in its normal use state, the body 10 has a rectangular cylindrical shape and has a pair of front and rear side walls 11, 12 and a pair of left and right end walls 13, 14. When the packaging box is in its normal use state, the internal space surrounded by the front side wall 11, rear side wall 12, left end wall 13, and right end wall 14 contains items (not shown).

The front wall 11 and rear wall 12 are rectangular and of the same dimensions, and face each other with a gap in the front-to-back direction. The left end wall 13 and right end wall 14 are rectangular and of the same dimensions, and face each other with a gap in the left-to-right direction. The dimensions of the front wall 11, rear wall 12, left end wall 13, and right end wall 14 are set appropriately according to the size of the contents.

As shown in FIG. 2, the body 10 has a horizontally long rectangular shape when unfolded. A right end wall 14 is connected to the right edge of the front wall 11 via a crease. A rear wall 12 is connected to the rear edge of the right end wall 14 via a crease. A left end wall 13 is connected to the left edge of the rear wall 12 via a crease. A band-shaped joint piece 15 is connected to the left edge of the front wall 11 via a crease. The joint piece 15 is joined to the front inner surface of the left end wall 13 by an adhesive such as hot melt.

Then, when the blank sheet S (see FIG. 2) is folded along each of the lines, a rectangular cylindrical body 10 is formed by the front wall 11, rear wall 12, left end wall 13, and right end wall 14.

A left bend guiding line 13a that functions as a bend guiding line is formed on the inner surface of the left end wall 13. The left bend guiding line 13a extends in the vertical direction at a position shifted rearward, which is one side of the front-to-rear direction, from the center of the left end wall 13 in the front-to-rear direction. The left bend guiding line 13a is two linear grooves (creases) formed at an interval on the upper and lower sides of the left end wall 13.

Similarly, a right bend guiding line 14a functioning as a bend guiding line is formed on the inner surface of the right end wall 14. The right bend guiding line 14a extends in the vertical direction at a position shifted forward from the center in the front-to-rear direction of the right end wall 14, which is the other side in the front-to-rear direction. The right bend guiding line 14a is two linear grooves (creases) formed at an interval on the upper and lower sides of the right end wall 14.
The left bend guiding line 13a and the right bend guiding line 14a may be formed by one linear groove (crease) on the top and bottom, or three or more linear grooves (creases) on the top and bottom. In addition, when the blank sheet S is thick, a cut (half cut line, etc.) may be formed along the groove. In this way, the blank sheet S can be easily folded at the left bend guiding line 13a and the right bend guiding line 14a.
Such left turn guiding line 13 a and right turn guiding line 14 a are arranged at positions rotationally symmetrical about a vertical line passing through the center point (not shown) of the bottom wall 30 .
The left end wall 13 and the right end wall 14 are formed with handrails 16, 16.

As shown in FIG. 1, the top wall 20 is formed by a front upper flap 21 and a rear upper flap 22 connected to the upper edges of the front wall 11 and the rear wall 12, respectively, and an upper left end flap 23 and an upper right end flap 24 connected to the upper edges of the left end wall 13 and the right end wall 14, respectively. The front upper flap 21, the rear upper flap 22, the upper left end flap 23, and the upper right end flap 24 are all rectangular flat plates. The tips of the front upper flap 21 and the rear upper flap 22 are butted together in the center of the top wall 20 in the fore-aft direction, as shown in FIG. 1.

A top left fold guide line 23a is formed on the inner surface of the top left flap 23. The top left fold guide line 23a functions as a fold guide line continuing from the left fold guide line 13a of the left end wall 13, and extends in the left-right direction at a position shifted rearward from the center of the top left flap 23 in the front-to-rear direction in response to the left fold guide line 13a. The top left fold guide line 23a is a linear groove (crease) formed in the center of the top left flap 23 in the left-to-right direction.

An upper right end fold guiding line 24a similar to the upper left end fold guiding line 23a is also formed on the inner surface of the upper right end flap 24. The upper right end fold guiding line 24a functions as a fold guiding line continuing from the right fold guiding line 14a of the right end wall 14, and extends in the left-right direction at a position shifted forward from the center in the front-rear direction of the upper right end flap 24 in correspondence with the right fold guiding line 14a. The upper right end fold guiding line 24a is a linear groove (crease) formed in the center in the left-right direction of the upper right end flap 24.
The upper left end fold guide line 23a and the upper right end fold guide line 24a may be formed by two or more linear grooves (creases) on the left and right. Also, when the blank sheet S is thick, cuts (half-cut lines, etc.) may be formed along the grooves. In this way, it becomes easier to fold the blank sheet S at the upper left end fold guide line 23a and the upper right end fold guide line 24a.

As shown in FIG. 1, the bottom wall 30 is formed by a front lower flap 31 and a rear lower flap 32 connected to the lower edge of the front wall 11 and the rear wall 12, respectively, and a left lower end flap 33 and a right lower end flap 34 connected to the lower edge of the left end wall 13 and the right end wall 14, respectively. The front lower flap 31, the rear lower flap 32, the left lower end flap 33, and the right lower end flap 34 are all rectangular flat plates. As shown in FIG. 1, the tips of the front lower flap 31 and the rear lower flap 32 are butted against each other in the center of the bottom wall 30 in the front-to-rear direction. The right corner 31a of the front lower flap 31 is cut out at approximately 45 degrees. The left corner 32a of the rear lower flap 32 is cut out at approximately 45 degrees.

The overlapping portions of the front lower flap 31 and the lower left and right flaps 33 and 34 are joined by an adhesive such as hot melt. The overlapping portions of the rear lower flap 32 and the lower left and right flaps 33 and 34 are also joined by an adhesive such as hot melt.

The left bottom end flap 33 is formed with a left break guiding line 33a and a left inclined bend guiding line 33b. The left break guiding line 33a is a break guiding line that separates the left bottom end flap 33 into front and rear parts, and extends in the left-right direction at a position shifted rearward from the center of the front-rear direction of the left bottom end flap 33 in correspondence with the left bend guiding line 13a of the left end wall 13. The left break guiding line 33a is a perforated line with intermittent slits. The interval and shape of the slits of the left break guiding line 33a are not limited. Such left break guiding line 33a, left bend guiding line 13a, and upper left end bend guiding line 23a are arranged in a straight line in the vertical direction of the blank sheet S, as shown in FIG. 2.

The left inclined fold guide line 33b extends obliquely from the middle of the left break guide line 33a of the left bottom end flap 33 toward the right edge of the left bottom end flap 33 toward the front side, which is the other side in the front-to-rear direction. The left inclined fold guide line 33b is a linear groove (crease) and has a partial notch. The left bottom end flap 33 is formed with a roughly triangular partition piece 33d that is partitioned by the left inclined fold guide line 33b, the left break guide line 33a, and the right edge of the left bottom end flap 33. The partition piece 33d can be raised on the left bottom end flap 33 along the left inclined fold guide line 33b (see FIG. 4). The right edge of the partition piece 33d is formed with a finger hook portion 33c cut into a semicircular shape.

The right lower end flap 34 is formed with a right break guiding line 34a and a right inclined bend guiding line 34b. The right break guiding line 34a is a break guiding line that separates the right lower end flap 34 into front and rear, and extends in the left-right direction at a position shifted forward from the center of the right lower end flap 34 in the front-rear direction in correspondence with the right bend guiding line 14a of the right end wall 14. The right break guiding line 34a is a perforated line with intermittent slits. The interval and shape of the slits of the right break guiding line 34a are not limited. Such right break guiding line 34a, right bend guiding line 14a, and upper right end bend guiding line 24a are arranged in a straight line in the vertical direction of the blank sheet S, as shown in FIG. 2.

The right inclined fold guide line 34b extends obliquely from the middle of the right break guide line 34a of the right lower end flap 34 toward the left edge of the right lower end flap 34 toward the rear side, which is one side in the front-to-rear direction. The right inclined fold guide line 34b is a linear groove (crease) and has a partial notch. The right lower end flap 34 has a roughly triangular partition piece 34d formed by the right inclined fold guide line 34b, the right break guide line 34a, and the left edge of the right lower end flap 34. The partition piece 34d can be raised on the right lower end flap 34 along the right inclined fold guide line 34b (see FIG. 4). The left edge of the partition piece 34d has a finger hook portion 34c cut out in a semicircular shape.

In normal use, when the packaging box 1 of this embodiment is used to store or transport contents, the top wall 20 is closed, similar to a typical A-type cardboard box. When opening the packaging box 1, the front upper flap 21, the rear upper flap 22, the upper left flap 23, and the upper right flap 24 of the top wall 20 are opened, similar to a typical A-type cardboard box.

Next, the procedure for opening the packaging box 1, removing all of the contents contained in the packaging box 1, and then changing the shape of the packaging box 1 to the first modified shape and the second modified shape will be described with reference to Figures 5 to 8.
When changing to the first modified shape, first, as shown in Fig. 5, with the front upper flap 21, the rear upper flap 22, the left upper end flap 23, and the right upper end flap 24 of the top wall 20 open (raised upward), insert a hand inside the body 10 and cut open the left break guide line 33a of the left lower end flap 33. In this case, the finger is hooked on the finger hook portion 33c and pulled upward. As a result, the break progresses along the left break guide line 33a, and the left lower end flap 33 is separated into the left rear flap piece 33a1 and the left front flap piece 33a2 at the left break guide line 33a, and the left front flap piece 33a2 is peeled off from the upper left surface of the front lower flap 31.

Similarly, the right break guide line 34a of the right bottom end flap 34 is cut open. In this case, the finger is hooked on the finger hook portion 34c and pulled upward. This causes the break to proceed along the right break guide line 34a, and the right bottom end flap 34 is separated at the right break guide line 34a into the right front flap piece 34a1 and the right rear flap piece 34a2, and the right rear flap piece 34a2 is peeled off from the upper right surface of the rear lower flap 32.

Then, as shown in Fig. 6, the left end wall 13 and the upper left end flap 23 are valley-folded along the left bend guiding line 13a and the upper left end guiding line 23a, and the right end wall 14 and the upper right end flap 24 are valley-folded along the right bend guiding line 14a and the upper right end guiding line 24a. In this case, the front end of the front lower flap 31 rides up on the upper surface of the front end of the rear lower flap 32, narrowing the bottom wall 30 in the front-rear direction. Then, the left front flap piece 33a2 in the free state rotates backward with the left bend guiding line 13a as a fulcrum in a plan view, and moves so as to ride up on the upper surface of the left rear flap piece 33a1. Also, the right rear flap piece 34a2 in the free state rotates forward with the right bend guiding line 14a as a fulcrum in a plan view, and moves so as to ride up on the upper surface of the right front flap piece 34a1. As a result, as shown in Figures 3 and 6, the left end wall 13 is bent along the left bend guide line 13a into a left rear end wall 131 with a smaller front-to-rear width and a left front end wall 132 with a larger front-to-rear width. Also, along the right bend guide line 14a, the right end wall 14 is bent along the right bend guide line 14a into a right front end wall 141 with a smaller front-to-rear width and a right rear end wall 142 with a larger front-to-rear width. This causes the packaging box 1 to be deformed into the first modified shape.

In the first deformed shape, the length of the left rear end wall 132, which has a larger front-to-rear width, is added to the front wall 11, and the length of the right rear end wall 142, which has a larger front-to-rear width, is added to the rear wall 12, so that the opposing front wall 11 and rear wall 12 move relatively more in the left-to-right direction. In other words, compared to when the left end wall 13 and the right end wall 14 are folded at the center of the left end wall 13 and the right end wall 14 in the front-to-rear direction, the left end wall 13 and the right end wall 14 protrude more to the left and right, and the maximum opening width of the body 10 becomes longer than the maximum opening width in the normal state.

6, the left front flap piece 33a2 and the right rear flap piece 34a2 are rotated to a position where the left front end portion of the front lower flap 31 that has climbed up onto the rear lower flap 32 abuts against the right front end portion 33e of the left rear flap piece 33a1. In this state, both the left front flap piece 33a2 and the right rear flap piece 34a2 are rotated approximately 45 degrees.
At this time, the right corner 31a of the front lower flap 31 is hidden in a state following the inclination of the right end wall 14 in a plan view, and the left corner 32a of the rear lower flap 32 is also hidden in a state following the inclination of the left end wall 13 in a plan view. This improves the aesthetic appearance of the first modified shape.

Next, a procedure for changing from the first changed configuration to the second changed configuration will be described.
7, in the first modified shape, the left front flap piece 33a2 is valley-folded along the left inclined folding guide line 33b, and the partition piece 33d is raised above the left front flap piece 33a2. Also, the right rear flap piece 34a2 is valley-folded along the right inclined folding guide line 34b, and the partition piece 34d is raised above the right rear flap piece 34a2.

Then, the left front end portion of the front lower flap 31 that is in contact with the right front end portion 33e of the left rear flap piece 33a1 is lifted to release the contact, and the front lower flap 31 is guided to the upper surface of the left rear flap piece 33a1.
Thereafter, the front wall 11 and the rear wall 12 are narrowed in the front-rear direction. As a result, the left front flap piece 33a2 in the free state rotates further rearward about the left bend guiding line 13a as a fulcrum in a plan view, and the upper surface of the left rear flap piece 33a1 moves toward the rear wall 12. Also, the right rear flap piece 34a2 in the free state rotates further forward about the right bend guiding line 14a as a fulcrum in a plan view, and the upper surface of the right front flap piece 34a1 moves toward the front wall 11.

8, the front wall 11 and the rear wall 12 are then narrowed in the front-rear direction until the partition piece 33d of the left front flap piece 33a2 abuts against the inner surface of the rear wall 12. This causes the partition piece 34d of the right rear flap piece 34a2 to similarly abut against the inner surface of the front wall 11. This causes the packaging box 1 to be deformed into the second modified shape.

4 and 8, in the second deformed shape, the obtuse angle between the left front end wall 132, which has a larger front-to-rear width, and the front wall 11 becomes larger than in the first deformed shape, and the obtuse angle between the right rear end wall 132, which has a larger front-to-rear width, and the rear wall 12 becomes larger than in the first deformed shape, so that the opposing front wall 11 and rear wall 12 move relatively more in the left-to-right direction, and the left end wall 13 and the right end wall 14 protrude more to the left and right. In other words, the maximum opening width of the body 10 becomes longer than the maximum opening width of the first deformed shape.
When the packaging box 1 is deformed into the second modified shape, a region 31b adjacent to the right corner 31a of the front lower flap 31 is exposed, and a region 32b adjacent to the left corner 32a of the rear lower flap 32 is exposed. These adjacent regions 31b, 32b can function as feet to prevent the packaging box 1 from falling over.

According to the packaging box 1 of the present embodiment described above, a left bend guide line 13a is formed on the left end wall 13 at a position shifted rearward from the center in the front-rear direction, and a right bend guide line 14a is formed on the right end wall 14 at a position shifted forward from the center in the front-rear direction. This allows the left end wall 13 and the right end wall 14 to be folded to different sizes in the front-rear direction, and the packaging box 1 can be changed to a shape in which the opening width of the body 10 is longer in the left-right direction compared to a case in which the shape of the box is changed by forming fold guide lines in the center in the front-rear direction of the left end wall 13 and the right end wall 14. This makes it possible to store the sheet body even if it is long in the folded state, and provides excellent storage properties for the sheet body.

In addition, since the left front flap piece 33a2 is formed with a left inclined fold guide line 33b and the right rear flap piece 34a2 is formed with a right inclined fold guide line 34b, the area of the left front flap piece 33a2 and the right rear flap piece 34a2 when viewed in plan can be reduced by folding along the left inclined fold guide line 33b and the right inclined fold guide line 34b. As a result, when changing the packaging box 1 to a long shape, it is possible to bring the left front flap piece 33a2 closer to the inner surface of the rear side wall 12, and the right rear flap piece 34a2 closer to the inner surface of the front side wall 11. As a result, the packaging box 1 can be changed to a second changed shape in which the opening width of the body 10 is longer in the left-right direction. Therefore, long sheets can also be stocked more suitably.

In addition, with the left rear flap piece 33a1 joined to the rear lower flap 32, and with the right front flap piece 34a1 joined to the front lower flap 31, the packaging box 1 can be changed to a long shape. In other words, when changing the packaging box 1 to a long shape, the overlapping state of the flaps in the joined portion is maintained, so that portion has excellent shape retention. Therefore, it is easy to change the packaging box 1 to a long shape.

In addition, since the upper left end flap 23 and the upper right end flap 24 are formed with the upper left end fold guide line 23a and the upper right end fold guide line 24a, the upper left end flap 23 and the upper right end flap 24 can be folded appropriately when changing the packaging box 1 into a long shape. Therefore, even if the packaging box 1 has a top wall 20, it is easy to change the shape into a long shape.

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.
For example, in the above embodiment, the left bend guiding line 13a is formed at a position shifted rearward from the center in the front-rear direction of the left end wall 13, and the right bend guiding line 14a is formed at a position shifted forward from the center in the front-rear direction of the right end wall 14, but this is not limited thereto, and conversely, the left bend guiding line 13a may be formed at a position shifted forward, and the right bend guiding line 14a may be formed at a position shifted rearward. In this case, the left break guiding line 33a, the right break guiding line 34a, the upper left end bend guiding line 23a, and the upper right end bend guiding line 24a may also be formed at corresponding positions to realize a suitable shape change.

In addition, in the above embodiment, a packaging box 1 having a top wall 20 has been described, but the top wall 20 is not necessarily required, and the present invention can be applied to a packaging box without a top wall 20.

The left bend guide line 13a and the right bend guide line 14a may be formed as a single continuous bend guide line without any gaps in the vertical direction. The upper left end bend guide line 23a and the upper right end bend guide line 24a may be formed over the entire left and right sides of the upper left end flap 23 and the upper right end flap 24.

The packaging box 1 in the above embodiment is made of corrugated cardboard, but the packaging box may also be made of any known paperboard.

1 Packaging box 10 Body 11 Front wall (side wall)
12 Rear wall (side wall)
13 Left end wall (end wall)
13a Left turn guiding line 14 Right end wall (end wall)
14a Right turn guiding line 20 Top wall 21 Front upper flap (upper flap)
22 Rear upper flap (upper flap)
23 Upper left flap (upper flap)
23a Upper left corner bend guide line 24 Upper right corner flap (upper corner flap)
24a: Upper right edge bend guide line 30: Bottom wall 31: Front lower flap (lower flap)
32 Rear lower flap (lower flap)
33 Left bottom flap (bottom flap)
33a1 Left rear flap piece (one side flap piece)
33a2 Left front flap piece 33a Left break guide line 33b Left inclined bend guide line 33d Partition piece 34 Right lower end flap (lower end flap)
34a1 Right front flap piece (other side flap piece)
34a2 Right rear flap piece 34a Right break guide line 34b Right inclined bend guide line 34d Partition piece S Blank sheet

Claims (3)

A body portion including a pair of front and rear side walls and a pair of left and right end walls;
A bottom wall connected to a lower edge portion of the body portion,
The bottom wall is
A pair of front and rear lower flaps connected to lower ends of the pair of front and rear side walls;
a pair of left and right lower end flaps connected to lower ends of the pair of left and right end walls and overlapping upper surfaces of the pair of front and rear lower flaps,
A left turn guiding line extending in the vertical direction is formed on the left end wall at a position shifted in one direction in the front-rear direction from the center part in the front-rear direction,
A right turn guiding line extending in the vertical direction is formed on the right end wall at a position shifted in the other direction in the front-rear direction from the center part in the front-rear direction,
A left break guide line extending in the left-right direction corresponding to the left turn guide line is formed on the left lower end flap,
A right break guide line extending in the left-right direction corresponding to the right bend guide line is formed on the right-side lower end flap ,
The left lower end flap is formed with a left inclined fold guide line extending obliquely from the middle of the left break guide line to the right edge of the left lower end flap in the other side in the front-rear direction,
The packaging box is characterized in that a right inclined fold guide line is formed on the right-side bottom end flap, the right inclined fold guide line extending obliquely to one side in the front-rear direction from a middle portion of the right-side break guide line toward the left edge of the right-side bottom end flap . In the left lower end flap, a flap piece on one side in the front-rear direction to be cut off at the left break guide line is attached to a left portion of the lower flap overlapping the flap piece,
2. The packaging box according to claim 1 , wherein the flap piece on the other side in the front-to-rear direction that is to be cut off at the right break guide line is attached to the right portion of the lower flap that overlaps it. A top wall is provided adjacent to an upper edge of the body portion,
The top wall is
A pair of front and rear upper flaps connected to upper ends of the pair of side walls;
a pair of upper end flaps connected to upper ends of the pair of end walls,
The upper end flap on the left side is formed with a left upper end folding guide line that functions as a folding guide line continuing from the left folding guide line and extends in the left-right direction;
3. The packaging box according to claim 1, wherein the upper end flap on the right side is formed with an upper right end fold guide line that functions as a fold guide line continuing from the right fold guide line and extends in the left-right direction.

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