JP2023094107A - packaging box - Google Patents

Abstract

To provide a packaging box changeable into a long-length shape, that exhibits an excellent stock property of a sheet body in a folded state.SOLUTION: A bottom wall 30 provided continuously to a lower edge part of a trunk part 10 comprises: a front and rear pair of lower side flaps 31, 32 provided continuously to a lower end of a front and rear pair of side walls 11, 12; and a right and left pair of lower end flaps 33, 34 provided continuously to a lower end of a right and left pair of end walls 13, 14. A left bending guide line 13a extending in an upward-downward direction at a position of being shifted to one side in a front-rear direction of a central part in the front-rear direction is formed on the left side end wall 13. A right bending guide line 14a extending in an upward-downward direction at a position of being shifted to the other side in a front-rear direction of a central part in the front-rear direction is formed on the right side end wall 14. A left fracture guide line 33a corresponding to the left bending guide wire 13a is formed in the left side lower end flap 33. A right fracture guide line 34a corresponding to the right bending guide wire 14a is formed in the right side lower end flap 34.SELECTED DRAWING: Figure 4

Description

The present invention relates to packaging boxes.

BACKGROUND ART In recent years, corrugated cardboard packaging boxes have been widely used as packaging boxes for online shopping and the like, and various products are being delivered. On the other hand, there is an increasing demand for stocking unsealed packaging boxes for reuse.
In general, since the packaging box can be folded flat after opening, it is ideal to stock the folded sheet bodies, and it is convenient to have a stock box for storing them. By the way, the sheet body in the folded state is longer than one side of the box. For this reason, in order to accommodate the sheet body, it is necessary to use a box in which the width of the opening of the cylindrical body is elongated or a box in which the width of the opening can be changed to be elongated.

2. Description of the Related Art Conventionally, as a packaging box in which the width of the opening of the body can be changed to be long, the one disclosed in Patent Document 1 is known. This packaging box is provided with a folding ruled line for changing the shape, and by folding along the folding ruled line, the width of the opening of the body can be changed to be long.

Japanese Patent Application Laid-Open No. 2007-204122

In the above-described conventional packaging box, the opening width of the body can be changed to be long by folding along the folding crease. There was a request to change to a long shape.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to provide a packaging box in which the width of the opening of the body can be changed to be long and which is excellent in stockability of folded sheets.

In order to solve the above-described problems, the packaging box of the present invention includes a trunk portion including a pair of front and rear side walls and a pair of left and right end walls, and a bottom wall connected to a lower edge portion of the trunk portion. . The bottom wall includes a pair of front and rear lower flaps connected to the lower ends of the pair of front and rear side walls, and a bottom wall 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. and a pair of left and right lower end flaps. The left end wall has a left turn guide line extending vertically at a position shifted to one side in the front-rear direction from the central portion in the front-rear direction. A right turn guide line extending in the vertical direction is formed at a position shifted to the other side in the front-rear direction from the central portion. The left lower end flap is formed with a left breaking guide line extending in the left-right direction corresponding to the left turn guide line, and the right lower end flap is formed in the left-right direction extending in the left-right direction corresponding to the right turn guide line. A right fracture guide line is formed.

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 lower end flaps are cut open along the left break guide line and the right break guide line, and the left turn guide line and right turn guide line Fold the left and right end walls along the lines. As a result, the bending positions of the left and right end walls are shifted from the center in the front-rear direction to one side and the other in the front-rear direction, and the left and right end walls are bent at the center in the front-rear direction of the left and right end walls. The left and right end walls can be made to protrude left and right compared to the case, and as a result, the opening width of the trunk can be changed to a shape that is longer in the left and right direction than in normal use. Therefore, the sheet body in the folded state is excellent in stockability.

Further, the left lower end flap is formed with a left slanted bending guide line extending obliquely in the other side in the front-rear direction from the middle portion of the left breaking guide line toward the right edge of the left lower end flap. Preferably, the right lower end flap has a right inclined bending guide line extending obliquely to one side in the front-rear direction from an intermediate portion of the right breaking guide line toward the right edge of the right lower end flap. is preferably formed.

In this configuration, when changing the shape of the packaging box into a long one, the left lower end flap is folded along the left slanting bending guide line, so that the flap piece on the other side in the front-rear direction that is cut off along the left breaking guide line is flattened. The area when viewed can be reduced. In addition, by bending the right lower end flap along the right slanting bending guide line, the area of the flap piece on one side in the front-rear direction that is cut off along the right breaking guide line can be reduced when viewed in plan. As a result, in the left lower end flap, the flap piece on the other side in the front-rear direction separated by the left fracture guide line can be brought closer to, for example, the inner surface of the rear side wall. In the above, it is possible to bring the flap piece on one side in the front-rear direction to be cut off along the right breaking guide line closer to, for example, the inner surface of the front side wall. As a result, the left and right end walls can be made to project further to the left and right sides, and as a result, the packaging box can be changed into a shape in which the opening width of the body is longer in the left and right direction.

Further, in the left lower end flap, it is preferable that the flap piece on one side in the front-rear direction separated by the left breaking guide line is adhered to the left portion of the lower flap overlapping therewith, and the right side flap In the lower end flap, it is preferable that the flap piece on the other side in the front-rear direction separated by the right fracture guide line is adhered to the right portion of the lower flap overlapping the flap piece.

In this configuration, the overlapped state of the flaps of the stuck portions is maintained, so that the shape retention of the portions is excellent, and the operation for changing the shape of the packaging box into a long one is easy.

Further, in the case where a top wall connected to the upper edge of the body portion is provided, the top wall includes a pair of front and rear upper flaps connected to the upper ends of the pair of side walls, and the pair of front and rear flaps. and a pair of left and right upper end flaps connected to the upper end of the end wall. Further, on the upper end flap on the left side, an upper left corner bending guide line that functions as a bending guide line continuing to the left bending guide line extends in the left-right direction, and on the upper end flap on the right side, It is preferable that an upper right-end bending guide line, which functions as a bending guide line continuous with the right-turn guide line, extends in the left-right direction.

With this configuration, when the opening width of the body of the packaging box is changed to be longer, the left upper end flap can be folded continuously from the left turn guide line, and the right turn guide line can be continued to fold the right side flap. The top flap can be folded. Therefore, even a packaging box having a top wall can be changed into an elongated shape.

The packaging box of the present invention can change the width of the opening of the body to be long, and is excellent in stockability of the folded sheet body.

1 is a perspective view showing a packaging box according to one embodiment of the present invention; FIG. It is the figure which showed the blank sheet of the packaging box which concerns on one Embodiment of this invention. It is the perspective view which showed the 1st modified shape of the packaging box which concerns on one Embodiment of this 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. 4 is a plan view showing the bottom surface of the packaging box according to one embodiment of the present invention; FIG. 5 is a plan view showing the bottom surface of the first modified shape of the packaging box according to the embodiment of the present invention; It is the top view which showed the procedure at the time of changing from the 1st modification shape to the 2nd modification shape of the packaging box which concerns on one Embodiment of this invention. FIG. 10 is a plan view showing the bottom surface of the packaging box according to the embodiment of the present invention in a second modified shape;

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the following description, the front, back, left, right, up and down 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 length in the left-right direction is longer than in the front-rear direction. The packaging box 1 includes 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 for closing the upper opening, and the bottom wall 30 serves as a lid for closing the lower opening. As will be described later, the packaging box 1 of this embodiment can change its shape into a first modified shape (see FIG. 3) and a second modified shape (see FIG. 4).

As shown in FIG. 2, the packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S obtained by cutting out one cardboard sheet along each ruled line. The blank sheet S shown in FIG. 2 is arranged so that the outer surface side can be seen, but for convenience of explanation, each ruled line formed on the inner surface side is indicated by a solid line.
Each ruled line (folded line) of the blank sheet S is a linear groove (press ruled line) formed by pressing the surface of the blank sheet S. As shown in FIG. Note that a notch (half-cut line or the like) may be formed in the ruled line. By doing so, it becomes easier to fold the blank sheet S at the ruled line.

The body portion 10 has a rectangular tubular shape in the normal use state of the packaging box, and has a pair of front and rear side walls 11 and 12 and a pair of left and right end walls 13 and 14 . In a normal state of use of the packaging box, an internal space surrounded by the front wall 11, the rear wall 12, the left end wall 13, and the right end wall 14 accommodates contents (not shown).

The front side wall 11 and the rear side wall 12 have rectangular shapes with the same dimensions, and face each other with a space therebetween in the front-rear direction. The left end wall 13 and the right end wall 14 have a rectangular shape with the same dimensions, and are opposed to each other with a space therebetween in the left-right direction. The dimensions of the front wall 11, the rear wall 12, the left end wall 13, and the right end wall 14 are appropriately set according to the size of the contents.

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

When the blank sheet S (see FIG. 2) is folded along the respective ruled lines, the front wall 11, the rear wall 12, the left end wall 13, and the right end wall 14 form the body portion 10 in the shape of a square tube.

On the inner surface of the left end wall 13, a left turn guide line 13a that functions as a bend guide line is formed. The left bend guide line 13a extends vertically at a position shifted to one side in the front-rear direction from the central portion of the left end wall 13 in the front-rear direction. The left-bending guide line 13a is two linear grooves (pressing lines) formed on the upper and lower sides of the left end wall 13 with a gap therebetween.

Similarly, on the inner surface of the right end wall 14, a right turn guide line 14a functioning as a bend guide line is formed. The right-turn guide line 14a extends vertically at a position shifted forward, which is the other side in the front-rear direction, from the central portion of the right end wall 14 in the front-rear direction. The right-turn guide line 14a is two upper and lower linear grooves (ruled lines) formed on the upper and lower sides of the right end wall 14 with a gap therebetween.
The left bend guide line 13a and the right bend guide line 14a may be formed by one upper and lower linear grooves (pressing lines), or may be formed by three or more upper and lower linear grooves (pressing lines). You may Moreover, when the thickness of the blank sheet S is large, a notch (half-cut line or the like) may be formed along the groove. This makes it easier to fold the blank sheet S along the left bend guide line 13a and the right bend guide line 14a.
Such left-turn guide line 13a and right-turn guide line 14a are arranged at rotationally symmetrical positions about a vertical line passing through the center point of the bottom wall 30 (not shown).
In addition, the left end wall 13 and the right end wall 14 are formed with grip portions 16 , 16 .

As shown in FIG. 1, the top wall 20 includes a front upper flap 21 and a rear upper flap 22 connected to upper edges of the front wall 11 and the rear wall 12, respectively, and a left end wall 13 and a right end wall 14, respectively. It is formed by an upper left end flap 23 and an upper right end flap 24 that are connected to the upper edge of the . The front upper flap 21, the rear upper flap 22, the upper left flap 23, and the upper right flap 24 are all rectangular flat plates. As shown in FIG. 1, the tip portions of the front upper flap 21 and the rear upper flap 22 are butted against each other at the central portion of the top wall 20 in the front-rear direction.

An upper left corner bending guide line 23 a is formed on the inner surface of the upper left corner flap 23 . The upper left corner bend guide line 23a functions as a bend guide line that continues to the left bend guide line 13a of the left end wall 13, and corresponds to the left bend guide line 13a. It extends in the left-right direction at a position shifted rearward from the central portion. The upper left corner bending guide line 23a is a single linear groove (creased line) formed in the center portion of the upper left corner flap 23 in the left-right direction.

An upper right corner bending guide line 24a similar to the upper left corner bending guide line 23a is also formed on the inner surface of the upper right corner flap 24 . The upper right corner bend guide line 24a functions as a bend guide line that continues to the right bend guide line 14a of the right end wall 14, and corresponds to the right bend guide line 14a. It extends in the left-right direction at a position shifted forward from the central portion. The upper right end bending guide line 24a is a single linear groove (crimp) formed in the central portion of the upper right end flap 24 in the left-right direction.
The upper left corner bending guide line 23a and the upper right corner bending guide line 24a may be formed by two or more linear grooves (pressing lines) on the left and right sides. Moreover, when the thickness of the blank sheet S is large, a notch (half-cut line or the like) may be formed along the groove. In this way, the blank sheet S can be easily folded along the upper left bending guide line 23a and the upper right bending guide line 24a.

As shown in FIG. 1, the bottom wall 30 includes a front lower flap 31 and a rear lower flap 32 connected to the lower edges of the front wall 11 and the rear wall 12, respectively, and a left end wall 13 and a right end wall 14. A lower left end flap 33 and a lower right end flap 34 connected to the respective lower edge portions of the . The lower front flap 31, the lower rear flap 32, the lower left flap 33, and the lower right flap 34 are all rectangular flat plates. As shown in FIG. 1, the tip portions of the lower front flap 31 and the lower rear flap 32 are butted against each other at the central portion of the bottom wall 30 in the front-rear direction. A right corner 31a of the front lower flap 31 is notched at approximately 45 degrees. A left corner 32a of the rear lower flap 32 is cut at approximately 45 degrees.

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

The left lower end flap 33 is formed with a left breaking guide line 33a and a left inclined bending guide line 33b. The left rupture guide line 33a is a rupture guide line that separates the left lower end flap 33 frontward and rearward, and corresponds to the left bend guide line 13a of the left end wall 13, and is located rearward of the front-back direction central portion of the left lower end flap 33. It extends all the way in the left-right direction at a position shifted to the left. The left breaking guide line 33a is a perforated line in which notches are intermittently formed. The interval and shape of the notch of the left breaking guide wire 33a are not limited. The left breaking guide line 33a, the left bend guide line 13a, and the upper left corner bend guide line 23a are arranged in a straight line along the vertical direction of the blank sheet S as shown in FIG.

The left slanting bending guide line 33b extends obliquely toward the right edge of the left lower end flap 33 from the middle of the left breaking guide line 33a of the left lower end flap 33 toward the front side, which is the other side in the front-rear direction. The left slanting bending guide line 33b is a linear groove (pressing line) and has a partial notch. The left lower end flap 33 is formed with a substantially triangular partition piece 33 d defined by the left inclined bending guide line 33 b , the left breaking guide line 33 a and the right edge of the left lower end flap 33 . The partition piece 33d can be raised on the left lower end flap 33 along the left inclined bending guide line 33b (see FIG. 4). A semicircular finger hook portion 33c is formed on the right edge of the partition piece 33d.

A right breaking guide line 34a and a right inclined bending guide line 34b are formed on the lower right end flap 34 . The right breaking guide line 34a is a breaking guide line that separates the lower right end flap 34 into the front and rear, and corresponds to the right turn bending guide line 14a of the right end wall 14, and extends forward of the center portion of the lower right end flap 34 in the front-rear direction. At the shifted position, it extends all the way in the left-right direction. The right breaking guide line 34a is a perforated line in which notches are intermittently formed. The interval and shape of the notch of the right breaking guide wire 34a are not limited. The right breaking guide line 34a, the right bend guide line 14a, and the upper right bend guide line 24a are arranged in a straight line along the vertical direction of the blank sheet S, as shown in FIG.

The right slanted bending guide line 34b extends obliquely toward the left edge of the lower right end flap 34 from the middle of the right break guide line 34a of the lower right end flap 34 toward the rear side, which is one side in the front-rear direction. . The right-slanted bending guide line 34b is a linear groove (crimping) and has a partial notch. The lower right end flap 34 is formed with a substantially triangular partition piece 34d defined by the right inclined bending guide line 34b, the right breaking guide line 34a, and the left edge of the lower right end flap 34. As shown in FIG. The partition piece 34d can be raised on the lower right end flap 34 along the right inclined bending guide line 34b (see FIG. 4). A semicircular finger hook portion 34c is formed on the left edge of the partition piece 34d.

In a normal use state in which contents are housed in the packaging box 1 of the present embodiment and transported or stored, the top wall 20 is closed like a general 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 in the same manner as a general A-type corrugated cardboard box.

Next, after opening the packaging box 1 and taking out all the contents contained in the packaging box 1, the procedure for changing the shape of the packaging box 1 to the first modified shape and the second modified shape, Description will be made with reference to FIGS.
When changing to the first modified shape, first, as shown in FIG. ), the hand is inserted into the inner side of the trunk 10 to cut open the left fracture guide line 33a of the left lower end flap 33. As shown in FIG. In this case, an operation is performed to put a finger on the finger hook portion 33c and pull it upward. As a result, the fracture progresses along the left fracture 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 along the left fracture guide line 33a, and the left front flap piece is separated. 33 a 2 is peeled off from the upper left surface of the front lower flap 31 .

Similarly, the right fracture guide line 34a of the lower right end flap 34 is cut open. In this case, an operation of putting a finger on the finger hooking portion 34c and pulling it upward is performed. As a result, the fracture progresses along the right fracture guide line 34a, and the lower right end flap 34 is separated into the right front flap piece 34a1 and the right rear flap piece 34a2 along the right fracture guide line 34a, and the right rear flap is separated. The piece 34 a 2 is peeled off from the upper right surface of the rear lower flap 32 .

Thereafter, as shown in FIG. 6, the left end wall 13 and the upper left end flap 23 are valley-folded along the left bend guide line 13a and the upper left bend guide line 23a, and the right end wall 14 and the upper right end flap 24 are A valley fold is made along the right turn guide line 14a and the upper right end bend guide line 24a. In this case, the bottom wall 30 is narrowed in the front-rear direction so that the front end portion of the front lower flap 31 rides on the upper surface of the front end portion of the rear lower flap 32 . Then, the left front flap piece 33a2 in the free state rotates rearward about the left turn guide line 13a in plan view, and moves so as to ride on the upper surface of the left rear flap piece 33a1. Further, the right rear flap piece 34a2 in the free state rotates forward with the right turn guide line 14a as a fulcrum in plan view, and moves so as to ride on the upper surface of the right front flap piece 34a1. 3 and 6, the left end wall 13 is bent into a left rear end wall 131 with a small front-rear width and a left front end wall 132 with a large front-rear width, with the left turn guide line 13a as a boundary. . Further, the right end wall 14 is bent into a right front end wall 141 with a small front-rear width and a right rear end wall 142 with a large front-rear width, with the right turn guide line 14a as a boundary. As a result, the packaging box 1 is deformed into the first modified shape.

In the first modified shape, the length of the left rear end wall 132 with a large front-rear width is added to the front wall 11, and the length of the right rear end wall 142 with a large front-rear width is added to the rear wall 12. The front wall 11 and the rear wall 12 move relative to each other largely in the horizontal direction. That is, compared to the case where the left end wall 13 and the right end wall 14 are bent at the central portion of the left end wall 13 and the right end wall 14 in the front-rear direction, the left end wall 13 and the right end wall 14 protrude greatly in the left and right sides. The maximum opening width of the portion 10 becomes longer than the maximum opening width in the normal state.

In FIG. 6, the left front flap piece 33a2 and the right rear flap piece 33a2 and the right rear flap piece 33a2 extend to a position where the left front end portion of the front lower flap 31 riding on the rear lower flap 32 contacts the right front end portion 33e of the left rear flap piece 33a1. 34a2 is rotated. In this state, the left front flap piece 33a2 and the right rear flap piece 34a2 are both rotated approximately 45 degrees.
At this time, the right corner portion 31a of the front lower flap 31 is hidden in a state following the inclination of the right end wall 14 in plan view, and the left corner portion 32a of the rear lower flap 32 is also at the left end in plan view. It is hidden along the inclination of the wall 13. - 特許庁This is intended to improve the aesthetic appearance of the first modified shape.

Next, the procedure for changing from the first modified shape to the second modified shape will be described.
First, as shown in FIG. 7, in the first modified shape, the left front flap piece 33a2 is valley-folded along the left inclined bending guide line 33b, and the partition piece 33d is raised above the left front flap piece 33a2. Further, the right rear flap piece 34a2 is valley-folded along the right inclined bending 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. do.
After that, the front side wall 11 and the rear side wall 12 are narrowed in the front-rear direction. Then, the left front flap 33 a 2 in the free state further rotates rearward about the left turn guide line 13 a in plan view, and the upper surface of the left rear flap 33 a 1 moves toward the rear wall 12 . Further, the right rear flap 34 a 2 in the free state further rotates forward about the right turn guide line 14 a in plan view, and the upper surface of the right front flap 34 a 1 moves toward the front wall 11 .

Thereafter, as shown in FIG. 8, the front wall 11 and the rear wall 12 are narrowed in the front-rear direction until the partition piece 33d of the left front flap piece 33a2 contacts the inner surface of the rear wall 12. As shown in FIG. As a result, the partition piece 34d of the right rear flap piece 34a2 is brought into contact with the inner surface of the front wall 11 as well. As a result, the packaging box 1 is deformed into the second modified shape.

In the second modified shape, as shown in FIGS. 4 and 8, the obtuse angle between the left front end wall 132 having a large front-to-rear width and the front wall 11 is larger than in the first modified shape, and the front-to-rear width is large. Since the obtuse angle between the right rear end wall 132 and the rear wall 12 is larger than in the first deformed shape, the front wall 11 and the rear wall 12 facing each other relatively move in the left-right direction by a large amount. The left end wall 13 and the right end wall 14 protrude more to the left and right sides. That is, the maximum opening width of the trunk portion 10 is longer than the maximum opening width of the first deformed shape.
When the packaging box 1 is deformed into the second modified shape, the portion 31b near the right corner 31a of the lower front flap 31 is exposed, and the portion 32b near the left corner 32a of the lower rear flap 32 is exposed. becomes. These neighboring parts 31b and 32b can function as legs for overturn prevention.

According to the packaging box 1 of the present embodiment described above, the left turn guide line 13a is formed at a position shifted rearward from the central portion in the front-rear direction with respect to the left end wall 13, , a right turn guide line 14a is formed at a position deviated forward from the central portion in the longitudinal direction. As a result, the left end wall 13 and the right end wall 14 can be bent to different sizes in the front-rear direction, and bending guide lines are formed in the front-rear center portions of the left end wall 13 and the right end wall 14 to form a box shape. The packaging box 1 can be changed to a shape in which the width of the opening of the body portion 10 is longer in the left-right direction than in the case of changing . As a result, even when the sheet body in the folded state is long, it can be stocked, and the sheet body is excellent in stockability.

Further, the left front flap piece 33a2 is formed with a left slanted bending guide line 33b, and the right rear flap piece 34a2 is formed with a right slanted bending guide line 34b. By bending along the guide line 34b, it is possible to reduce the area of the left front flap piece 33a2 and the right rear flap piece 34a2 in plan view. As a result, when the packaging box 1 is changed into a long shape, the left front flap piece 33a2 can be brought closer to the inner surface of the rear wall 12, and the right rear flap piece 34a2 can be moved closer to the inner surface of the front wall 11. can be brought closer. As a result, the packaging box 1 can be changed to the second modified shape in which the width of the opening of the body portion 10 is longer in the left-right direction. Therefore, long sheet bodies can be stocked more favorably.

In addition, the left rear flap piece 33a1 is joined to the rear lower flap 32 and the right front flap piece 34a1 is joined to the front lower flap 31, so that the packaging box 1 can be changed into a long shape. That is, when changing the shape of the packaging box 1 into a long shape, the overlapped state of the flaps of the joined portions is maintained, so that the portion is excellent in shape retention. Therefore, it is easy to perform the work for changing the shape of the packaging box 1 into 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 bending guide line 23a and the upper right end bending guide line 24a, when the packaging box 1 is changed into a long shape, the upper left The end flap 23 and the upper right end flap 24 can be conveniently folded. Therefore, even when the packaging box 1 has the top wall 20, it is easy to change the shape to a long shape.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the scope of the invention.
For example, in the above-described embodiment, the left-turn guide line 13a is formed at a position shifted rearward from the front-rear central portion of the left end wall 13, and the right-turn guide line 14a is formed from the front-rear central portion of the right end wall 14. However, it is not limited to this, and conversely, the left turn guide line 13a is formed at a position shifted forward, and the right turn guide line 14a is formed at a position shifted rearward. It may be formed at a position In this case, the left breaking guide line 33a, the right breaking guide line 34a, the upper left corner bending guide line 23a, and the upper right corner bending guide line 24a are also formed at the corresponding positions, so that a suitable shape change can be realized. .

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

Further, the left-turn guide line 13a and the right-turn guide line 14a may be formed by a single bend guide line that is continuous with no gap in the vertical direction. Further, the upper left bend guide line 23a and the upper right bend guide line 24a may be formed over the entire left and right flaps 23 and 24, respectively.

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

1 packaging box 10 trunk 11 front side wall (side wall)
12 rear wall (side wall)
13 Left end wall (end wall)
13a Left turn guide line 14 Right end wall (end wall)
14a right turn guide 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 end bending guide line 24 Upper right end flap (upper end flap)
24a upper right end bending 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 (flap piece on one side)
33a2 Left front flap piece 33a Left breaking guide line 33b Left inclined bending guide line 33d Division piece 34 Lower right end flap (lower end flap)
34a1 right front flap piece (flap piece on the other side)
34a2 Right rear flap piece 34a Right breaking guide line 34b Right inclined bending guide line 34d Section piece S Blank sheet

Claims (4)

a body portion comprising a pair of front and rear side walls and a pair of left and right end walls;
a bottom wall connected to the lower edge of the trunk,
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 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,
A left turn guide line extending vertically is formed on the left end wall at a position shifted to one side in the front-rear direction from the central portion in the front-rear direction,
A right turn guide line extending vertically is formed on the right end wall at a position shifted to the other side in the front-rear direction from the central portion in the front-rear direction,
A left breaking guide line extending in the left-right direction corresponding to the left turn guide line is formed on the left lower end flap,
A packaging box, wherein the right lower end flap is formed with a right breaking guide line extending in the left-right direction corresponding to the right turn guide line. The left lower end flap is formed with a left slanted bending guide line extending obliquely to the other side in the front-rear direction from an intermediate portion of the left breaking guide line toward the right edge of the left lower end flap,
The right lower end flap is formed with a right inclined bending guide line extending obliquely to one side in the front-rear direction from an intermediate portion of the right breaking guide line toward the right edge of the right lower end flap. The packaging box according to claim 1, characterized by: In the lower end flap on the left side, the flap piece on one side in the front-rear direction separated by the left breaking guide line is attached to the left portion of the lower flap that overlaps with it,
In the right lower end flap, the flap piece on the other side in the front-rear direction separated by the right breaking guide line is adhered to the right portion of the lower flap overlapping the flap piece. The packaging box according to claim 2. A top wall connected to the upper edge of the trunk,
The top wall is
a pair of front and rear upper flaps connected to the upper ends of the pair of side walls;
a pair of left and right upper end flaps connected to the upper ends of the pair of end walls,
The left upper end flap is formed with an upper left end bending guide line that functions as a bending guide line continuous with the left turn guide line and extends in the left-right direction,
The right upper end flap is formed with an upper right end bending guide line that functions as a bending guide line continuous with the right bend guide line and extends in the left-right direction. 4. The packaging box according to any one of 3.

Images