JP3648208B2 - Packaging box - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a box-shaped packaging box made by folding a blank such as a corrugated cardboard board, and in particular, from a state in which the blank is folded in a double shape, without using an adhesive, a staple, an adhesive tape, or the like. The container can be assembled, and after taking out the stored items from the box-shaped container, the blank can be easily folded in double, and therefore, it relates to a packaging box suitable for use as a returnable box or the like.
[0002]
[Prior art]
One of the most common conventional packaging containers is a box-shaped packaging box made by bending a blank such as a cardboard board. For example, a blank is bent in the same direction with four parallel lines in the same direction, and its both ends are bonded or stapled to form a square cylindrical body, which extends from the lower side of this body. The bottom flap is folded inward to close the lower surface of the box, and the upper flap extending from the upper side of the trunk is folded inward to close the upper surface of the box.
[0003]
In such a packaging box, a stored item is stored inside the box with the bottom of the box closed, and then the top of the box is closed. The bottom of the box is firmly closed using an adhesive, staples or adhesive tape so that it can withstand the weight of the stored item. The upper surface is also closed by the adhesive, staple, adhesive tape or other appropriate means so as not to open easily during conveyance.
[0004]
Most cardboard boxes are disassembled at the storage destination after being transported, and discarded or collected by a recycler. However, the reality is that the percentage of cardboard boxes that are actually recycled is small. A corrugated board used as a blank for a corrugated cardboard box is a product using paper made from resin pulp, and resource saving is required.
[0005]
As a form that has been used for a long time for resource saving of cardboard boxes, there is a so-called returnable box. This is a form in which a corrugated cardboard box is used by reciprocating between a transport source of stored items and a transport destination thereof. This returnable box needs to be able to easily fold an empty cardboard box in order to increase the storage efficiency and the conveyance efficiency when storing and returning the cardboard box after the article is taken out.
[0006]
[Problems to be solved by the invention]
The most problematic problem in so-called returnable boxes is the means for closing the bottom of the box. As described above, in the cardboard box, it is necessary to firmly close the bottom surface of the box so that the weight of the stored item can be withstood. Therefore, generally, a means for connecting the flaps on the bottom side with an adhesive, staples, adhesive tape or the like is taken.
[0007]
However, in a cardboard box in which the bottom flap is attached with an adhesive, the adhesive remains on the bottom flap when the bottom flap is separated to fold the cardboard box. Further, when the bottom flap is separated, the bottom flap may be damaged. Even if it is not damaged, the bottom flap deteriorates every time it is separated. Further, when reassembling the cardboard box, a special tool such as an adhesive applicator is required to attach the bottom flap with an adhesive, which is troublesome.
[0008]
Also, with the means to stop the bottom flap with staples or adhesive tape, every time the bottom flap is separated to fold the cardboard box, the bottom flap is peeled off when holes are left in the bottom flap or when the adhesive tape is peeled off. There is a problem that the strength of the flap is lowered.
[0009]
In view of the problems of the packaging box such as the conventional cardboard box as described above, the present invention can be easily assembled without using an adhesive, a staple, an adhesive tape or the like as a returnable box. An object of the present invention is to provide a packaging box that can reliably withstand the weight and can be assembled and folded without deteriorating the bottom flap.
[0010]
[Means for Solving the Problems]
Generally, a packaging box is composed of end panels 1 and 1 constituting a pair of opposite end faces of a box and side panels 2 and 2 constituting a pair of opposite side faces of the box alternately via a broken line. Bottom flaps 5 and 5 and bottom flaps that are continuous and the side edges of the end panel 1 and the end panel 1 are joined to each other and close the bottom of the box from the side panels 2 and 2 and the end panels 1 and 1 4 and 4 are respectively extended.
[0011]
In the present invention, in such a packaging box, the portions near the fold line with the side panels 2 and 2 of the bottom flaps 5 and 5 are obliquely cut to provide the insertion slits 8 and 8, and this insertion slit 8 and 8 can insert both corners of the outer bottom flaps 4 and 4 into the inner inner flaps 5 and 5, and the portions of the insertion slits 8 and 8 closer to the end face of the box body are inner flaps. 5 and 5 are partly connected to the inner bottom flaps 5 and 5 as guide flaps 9 and 9 without being separated from each other. Folding lines 14 and 14 are provided for temporary folding when inserted into the outer wall 8, and both ends of the folding lines 14 and 14 are bent in an arc shape toward the edge of the bottom outer flaps 4 and 4 .
[0012]
Specifically, the guide flaps 9 and 9 are in the shape of right triangles cut out by the insertion slits 8 and 8 and cutting lines parallel to both side edges of the bottom flaps 5 and 5. 9 is connected to the bottom inner flaps 5 and 5 via folding lines 10 and 10 parallel to the front end edges of the bottom inner flaps 5 and 5.
[0013]
In such a packaging box according to the present invention, both corners of the outer bottom flaps 4, 4 are inserted into the inner inner flaps 5, 5 from the insertion slits 8, 8 provided in the inner inner flaps 5, 5. Thus, the bottom outer flaps 4 and 4 and the bottom inner flaps 5 and 5 are connected to each other, and the state in which the bottom surface of the box is closed is maintained. In this case, a portion of the insertion slits 8 and 8 close to the end face of the box is separated from the bottom flaps 5 and 5 as guide flaps 9 and 9, part of which is connected to the bottom flaps 5 and 5. Therefore, the guide flaps 9 and 9 serve as guides for inserting both corners of the outer bottom flaps 4 and 4 into the inner bottom flaps 5 and 5 from the insertion slits 8 and 8 and smoothly insert them. Is possible. In addition, after insertion, the guide flaps 9 and 9 hold the corners of the outer bottom flaps 4 and 4 from above due to the weight of the luggage stored in the box. It does not come out easily from the insertion slits 8 and 8. In addition, since the guide flaps 9 and 9 are partially connected to the bottom inner flaps 5 and 5, they hit the guide flaps 9 and 9 when a blank before assembling the cardboard box is manufactured by means such as punching. The part is not separated from the blank, and no corrugated board waste is generated.
[0014]
In such a packaging box, the insertion slits 8, 8 are cut in parallel to both side edges of the bottom inner flaps 5, 5 at the end of the insertion slits 8, 8 near the side surface of the box body, If the insertion end portions 18 and 18 into which both corner portions are inserted first are provided, both corner portions of the outer bottom flaps 4 and 4 are easily inserted into the inside of the box from the insertion slits 8 and 8.
[0015]
Further, the middle portion of the bottom outer flap 4,4, since fold line 14, 14 for temporarily bent when inserted into the two corners in the insertion slit 8, 8 are provided, a bottom at the fold lines 14 and 14 Insert both corners of the outer flaps 4 and 4 into the insertion slits 8 and 8 and then extend the bottom outer flaps 4 and 4 again. The insertion slits 8 and 8 can be easily inserted into the inside of the box.
[0016]
The bottom surface of the box needs to withstand the weight of the stored item. Therefore, when the bottom flaps 5 and 5 on both sides are folded inside the box in order to close the bottom surface of the box, the overlapping portion 17 is provided in which the front edge portions of the bottom flaps 5 and 5 overlap each other. Since the bottom inner flaps 5 and 5 on both sides support each other, it is possible to withstand a greater load of the stored items.
[0017]
The above is the sealing means on the bottom surface of the box, but the same sealing means can be used on the top surface of the box. That is, a portion of the upper inner flaps 7, 7 close to the side of the box is cut obliquely to provide insertion slits 11, 11 from which both corners of the upper outer flaps 6, 6 are formed. It can be inserted inside the upper inner flaps 7, 7, and the portion of the insertion slits 11, 11 close to the end face of the box is separated from the upper inner flaps 7, 7 as guide flaps 12, 12. A part of the inner flaps 7 is connected to the inner flaps 7, and fold lines 15, 15 are provided at the intermediate portions of the upper and outer flaps 6, 6 to temporarily bend the both corners into the insertion slits 11, 11. Both ends of the folding lines 15 and 15 are bent in an arc shape toward the end edges of the upper and outer flaps 6 and 6.
[0018]
In this case, the guide flaps 12 and 12 have a right triangle shape cut out by the insertion slits 11 and 11 and cutting lines parallel to both side edges of the upper inner flaps 7 and 7, and the guide flaps 12 and 12 The flaps 7 and 7 are connected to the inner flaps 7 and 7 via folding lines 13 and 13 parallel to the leading edges of the flaps 7 and 7. Further, the end of the insertion slits 11 and 11 near the side of the box is cut in parallel with both side edges of the upper and inner flaps 7 and 7, and both corners of the upper and outer flaps 6 and 6 are inserted first. Insertion end portions 19, 19 are provided .
[0019]
The sealing function on the top surface of the packaging box having such a configuration is basically the same as that on the bottom surface side. However, since the load of the stored item is not directly applied to the upper surface of the packaging box, the overlapped portion 17 of the bottom flaps 5 and 5 such as the bottom surface is rarely required. However, in the case where several packaging boxes are stacked, there is an actual advantage of providing a superposed portion in which the top edge side portions of the upper inner flaps 7 and 7 are overlapped with each other like the bottom surface.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described specifically and in detail with reference to the drawings.
FIG. 1 is a developed view of a blank showing an embodiment of a general packaging box of the present invention. The blank for the packaging box uses a corrugated board in which a core made of a corrugated sheet made of paper is laminated with a liner. A blank before assembly is completed by punching the corrugated board as shown by a thick solid line in FIG. 1 and inserting a broken line as shown by a two-dot chain line. A thick broken line indicates a cut. All the broken lines shown by the two-dot chain line are bent in the same direction with respect to the paper surface of FIG.
[0021]
In the blank of the packaging box shown in FIG. 1, rectangular end panels 1 and 1 and side panels 2 and 2 are alternately connected via a broken line. The heights of the end panels 1 and 1 and the side panels 2 and 2 are the same, and the widths of the two side panels 2 and 2 and the two end panels 1 and 1 are equal to each other. Panels 1 and 1 have different widths. Needless to say, the heights and widths of the side panels 2 and 2 and the end panels 1 and 1 differ depending on the application, the size of the stored items, and the like.
[0022]
A joining flap 3 is extended from the side of the end panel 1 at the end via a broken line, and no such joining flap is extended to the side panel 2 at the end.
Outer bottom flaps 4, 4 are extended from the bottom line of the end panels 1, 1. The lengths (left and right dimensions in FIG. 1) of the outer bottom flaps 4 and 4 are slightly narrower than the width of the end panels 1 and 1, and the height e is w with respect to the width w of the end panels 1 and 1. / 2 + α.
[0023]
Folded lines 14 and 14 are provided at positions about e / 3 from the middle part of the outer bottom flaps 4 and 4, more specifically from the broken line that is the boundary with the end panels 1 and 1, respectively. ing. The fold lines 14 and 14 are formed by being divided into three parts in the width direction of the outer bottom flaps 4 and 4, and both ends of each fold line are bent in an arc shape toward the end edge side of the outer bottom flaps 4 and 4.
[0024]
Inner bottom flaps 5, 5 extend from the fold line on the lower side of the side panels 2, 2. The lengths (left and right dimensions in FIG. 1) of the bottom inner flaps 5 and 5 are slightly narrower than the widths of the side panels 2 and 2, and the height e is the same as the bottom outer flaps 4 and 4. The width w of the end panels 1 and 1 is w / 2 + α. This α is a surplus portion 16 that exceeds the height of the lower w / 2 indicated by a two-dot chain line in FIG. 1, and, as described later, when the bottom outer flaps 4, 4 are folded inside the box, This surplus portion 16 becomes a superposed portion that overlaps each other.
[0025]
On both sides of the bottom flaps 5, 5, cut lines are provided at an angle of about 45 ° at portions close to the fold line with the side panels 2, 2, which serve as insertion slits 8, 8. Cut lines are bent at both ends of the insertion slits 8 and 8 so as to be parallel to both side edges of the bottom flaps 5 and 5. Among these, the end of the insertion slits 8 and 8 on the side close to the fold line with the side panels 2 and 2 is inserted into the insertion slits 8 and 8 at both corners of the outer bottom flaps 4 and 4 as described later. , The insertion end portions 18 and 18 into which both corners are inserted first.
[0026]
The distance b1 from the fold line between the side panels 2 and 2 and the end panels 1 and 1 to the end of the insertion slits 8 and 8 near the fold line with the side panels 2 and 2 is the bottom flaps 4 and 4. Is about ½ of the height e. Further, the distance a1 from the fold line between the side panels 2 and 2 and the end panels 1 and 1 to the other end of the insertion slits 8 and 8 is equal to or much more than the height e of the end panel 4. Slightly larger.
[0027]
Further, incisions are made in parallel to these side edges at positions closer to both side edges of the bottom inner flaps 5, 5 than the insertion slits 8, 8. This incision line is connected to the insertion end portions 18 and 18 of the insertion slits 8 and 8 through a short cutting line on the folding line between the bottom flaps 5 and 5 and the side panels 2 and 2. Triangular guide flaps 9, 9 are formed by the cut lines and the insertion slits 8, 8. The guide flaps 9, 9 are fold lines parallel to the edges of the bottom inner flaps 5, 5. 10 and 10 are connected to the bottom flaps 5 and 5.
[0028]
Upper and outer flaps 6, 6 extend from the fold line on the upper side of the end panels 1, 1. The length of the upper and outer flaps 6 and 6 (left and right dimensions in FIG. 1) is slightly narrower than the width of the end panels 1 and 1, and the height f is about ½ of the width of the end flaps 1 and 1. It is. That is, it is lower by α than the aforementioned bottom bottom flaps 4, 4.
[0029]
Folded lines 15 and 15 are respectively provided at intermediate positions of the upper and outer flaps 6 and 6, more specifically, at a height of about e / 3 from the bent line that is a boundary with the end panels 1 and 1. Yes. The fold lines 15 and 15 are formed by being divided into three along the width direction of the upper and outer flaps 6 and 6, and both ends of each fold line are bent in an arc shape toward the end edge side of the upper and outer flaps 6 and 6.
[0030]
Upper inner flaps 7, 7 extend from the fold line on the upper side of the side panels 2, 2. The lengths of the upper and inner flaps 7 and 7 (left and right dimensions in FIG. 1) are slightly narrower than the width of the side panels 2 and 2. The height f of the upper and inner flaps 7 and 7 is the same as that of the outer and upper flaps 6 and 6 and is about ½ of the width of the end flaps 1 and 1. That is, it is lower by α than the above-mentioned bottom flaps 5 and 5.
[0031]
As with the bottom inner flaps 5 and 5, the upper inner flaps 7 and 7 are provided with cut lines obliquely at an angle of about 45 ° at portions near the fold lines with the side panels 2 and 2 on both sides thereof. The slits 11 and 11 are formed. The cut lines are also bent so that both ends of the insertion slits 11 and 11 are parallel to both side edges of the upper and inner flaps 7 and 7. Of these, the end portions of the insertion slits 11, 11 near the fold line with the side panels 2, 2 are the insertion end portions 19, 19 similar to the insertion end portions 18, 18 of the outer bottom flaps 4, 4. It has become.
[0032]
The distance b2 from the fold line between the side panels 2 and 2 and the end panels 1 and 1 to the end of the insertion slits 11 and 11 near the fold line with the side panels 2 and 2 is the height of the end panel 4. about half of e. The distance a2 from the broken line between the side panels 2 and 2 and the end panels 1 and 1 to the other end of the insertion slits 8 and 8 is equal to the height f of the upper and outer flaps 6 and 6, or Only slightly larger than that. That is, the insertion slits 11 and 11 are provided at positions closer to both side edges of the upper inner flaps 7 and 7 than the insertion flaps 8 and 8 of the bottom inner flaps 5 and 5 by an amount of α. This is because the height f of the upper inner flaps 7, 7 is lower by α than the aforementioned lower inner flaps 5, 5.
[0033]
Further, incisions are made in parallel to both side edges at positions closer to both side edges of the upper inner flaps 7, 7 than the insertion slits 11, 11. This incision line is connected to the insertion end portions 19 and 19 of the insertion slits 11 and 11 through a short cutting line provided on the folding line between the upper inner flaps 7 and 7 and the side panels 2 and 2. Yes. Triangular guide flaps 12, 12 are formed by the cut lines and the insertion slits 11, 11. The guide flaps 12, 12 are fold lines parallel to the edges of the upper inner flaps 7, 7. The upper and inner flaps 7 and 7 are connected to each other via 13 and 13.
[0034]
A packaging box is assembled from such a blank as follows.
First, all the fold lines between the end panels 1, 1, the side panels 2, 2 and the joining flap 3 are bent in the same direction at an angle of 90 °. Further, an adhesive is applied to the outer surface of the joining flap 3, and the outer surface of the joining flap 3 is attached to the inner surface of the end edge portion of the end panel 1. Thereby, a square cylindrical body is formed by the side panels 2 and 2 and the end panels 1 and 1.
[0035]
Next, as shown in FIG. 2, the bottom surface of the box is closed by the bottom inner flaps 5, 5 and the bottom outer flaps 4, 4. When the bottom of the box is closed, the bottom flaps 5 and 5 are folded inside the box, and then both corners of the bottom outer flaps 4 and 4 are connected to the bottom flaps 5 and 5 from the insertion slits 8 and 8, respectively. It is inserted inside and is exactly the same as the procedure for closing the upper surface of the box described below. Therefore, description of means for closing the bottom surface of the box will be omitted, and the procedure for closing the top surface of the box will be described in detail below, assuming that the bottom surface of the box has already been closed as shown in FIG.
[0036]
As described above, the height e of the bottom flaps 5 and 5 is only w / 2 + α with respect to the width w of the end panels 1 and 1, and w / below the portion indicated by the two-dot chain line in FIG. 2, when the outer bottom flaps 4, 4 are folded inside the box as shown in FIG. 2, the excess portions 16 overlap each other to form the overlapping portion 17. The The overlapping portion 17 serves as a reinforcing means for the bottom surface of the box body to withstand the weight of the stored item.
[0037]
After closing the bottom surface of the box as shown in FIG. 2, the box is reversed and the upper surface is directed upward. In this state, put the necessary storage items in the box. After the stored item is stored in the box, the upper inner flaps 7, 7 are bent inward at an angle of about 90 ° as shown in FIG.
[0038]
Next, both corners of the upper and outer flaps 6, 6 are inserted from the insertion slits 11, 11 provided in the upper inner flaps 7, 7, and the both corners are inserted inside the upper inner flaps 7, 7. In FIG. 4, the upper outer flaps 6, 6 on the upper left are in a state where both corners are inserted from the insertion slits 11, 11 and are inserted inside the upper inner flaps 7, 7. On the other hand, the lower right upper and outer flaps 6 and 6 in FIG. 4 are in a state where both corners are about to be inserted into the insertion slits 11 and 11.
[0039]
To explain this procedure, the upper and outer flaps 6 are once bent at the folding line 15 at the intermediate portion thereof, both corners of the upper and outer flaps 6 are aligned with the insertion end portions 19 and 19 of the insertion slits 11 and 11, and the guide flap 12 , 12 is pushed down. Subsequently, the upper and outer flaps 6 are slid as indicated by arrows, and both corners thereof are pushed along the guide flaps 12 and 12 from the insertion slits 11 and 11 to the lower side of the upper and inner flaps 7 and 7, and at the intermediate portion. The upper and outer flaps 6 bent at the fold line 15 are gradually extended. When the upper and outer flaps 6 bent at the fold line 15 are completely extended, both corners of the upper and outer flaps 6 extend from the insertion slits 11 and 11 to the lower side of the upper and inner flaps 7 and 7, as shown in FIG. Inserted.
[0040]
In this state, since the upper and outer flaps 6 and 6 are connected to the upper and inner flaps 7 and 7 on both sides, the upper and outer flaps 6 and 6 and the upper and inner flaps 7 and 7 are restrained from each other. The state in which the upper surface of the box is closed is maintained. The fold lines 15 and 15 of the upper and outer flaps 6 and 6 are formed by dividing into three in the width direction of the upper and outer flaps 6 and 6, and both ends of each fold line are circles toward the edge sides of the upper and outer flaps 6 and 6. Since the upper and outer flaps 6 and 6 are inserted, the upper and outer flaps 6 and 6 can be bent at the fold lines 15 and 15 when the upper and outer flaps 6 and 6 are inserted. Unyielding. Thereby, the state where the upper surface of the box was closed is stably held.
[0041]
As already described, these points are exactly the same on the bottom side of the box shown in FIG. However, since the front ends of the bottom flaps 5 and 5 overlap each other at the overlapping portion 17, the connection strength on the bottom surface side of the box is stronger than that on the top surface side.
Next, when the upper surface of the closed box is opened in this way, as shown in FIG. 4, the middle portion of the upper and outer panel 6 is folded at the fold line 15 as shown in FIG. The top end side of the upper and outer panel 6 is pulled in the opposite direction, and both corners are pulled out from the insertion slits 11 and 11. This is performed for both the upper and outer panels 6 and 6 to obtain the state shown in FIG. 3, and then the upper and inner panels 7 and 7 are raised to open the upper surface of the box. Then, after taking out the stored item from the box, the box is inverted and the bottom side is opened in the same manner. As a result, the box can be folded.
[0042]
In the above-mentioned example, terms such as “side panel” and “end panel” are used separately for the side face and the end face of the hexahedron box, but the relative position relationship between the side face and the end face of the box body is used. If a pair of opposed vertical surfaces facing each other is used as a side surface, the other pair of opposed vertical surfaces orthogonal to those surfaces is merely an end surface. As is apparent from the case of a box having a square plane, the side surface and the end surface are only meaningful for distinguishing two opposing vertical surfaces.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to easily assemble as a returnable box without using an adhesive, a staple, an adhesive tape, or the like, and it is possible to reliably withstand the weight of the stored item. It is possible to obtain a box-shaped packaging box that can be assembled and folded without deteriorating the bottom flap.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a packaging box according to the present invention, and is a development view of a blank in a state where a corrugated cardboard or the like is cut to assemble a packaging box and a broken line is inserted.
FIG. 2 is a perspective view of the packaging container as viewed from the bottom side with the bottom of the box closed.
FIG. 3 is a perspective view seen from the upper surface side in a state where the upper inner flap is folded to close the upper surface of the box body in the embodiment of the packaging container.
4 is a perspective view seen from the upper surface side in a state where both corners of the upper and outer flaps are inserted into the insertion slits of the upper and inner flaps in order to close the upper surface of the box body in the embodiment of the packaging container. FIG.
FIG. 5 is a perspective view seen from the upper surface side in a state where the upper surface of the box is closed in the embodiment of the packaging container.
[Explanation of symbols]
5 Inner flap 8 Insertion slit 4 Outer bottom flap 9 Guide flap 10 Guide flap fold line 17 Inner flap overlap part 11 Insertion slit 12 Guide flap 18 Insertion end 19 Insertion end

Claims (7)

End panels (1), (1) constituting a pair of opposite end faces of the box and side panels (2), (2) constituting a pair of opposite side faces of the box are alternately connected via a broken line. The side edges of the end panel (2) and the end panel (1) are joined to each other, and the bottom surface of the box is moved from the side panels (2), (2) and the end panels (1), (1). In the packaging box in which the bottom inner flaps (5) and (5) and the outer bottom flaps (4) and (4) are respectively extended, the side panels of the bottom inner flaps (5) and (5) ( 2), the part close to the fold line with (2) is obliquely cut to provide insertion slits (8), (8), and the bottom outer flap (4) from the insertion slits (8), (8) , (4) both corners can be inserted inside the bottom inner flaps (5), (5), and the end of the box of the insertion slits (8), (8) Bottom flaps near side part (5), (5) the guide flap without separation from (9), a bottom inner flap as (9) (5), and lined with a part (5), Furthermore, folding lines (14) and (14) are provided in the middle of the outer bottom flaps (4) and (4) for temporarily folding both corners into the insertion slits (8) and (8). The packaging box characterized in that both ends of the fold lines (14), (14) are bent in an arc shape toward the edge of the outer bottom flaps (4), (4) .   Guide flaps (9), (9) are right-angled triangular shapes cut out by insertion slits (8), (8) and bottom flaps (5), cutting lines parallel to both side edges of (5). Yes, the guide flaps (9), (9) are connected to the bottom inner flaps (5), (5) via the folding lines (10), (10) parallel to the tip edges of the bottom inner flaps (5), (5). The packaging box according to claim 1, wherein The slits (8) and (8) are cut in parallel to the side edges of the bottom inner flaps (5) and (5) at the end near the side panel (2) and (2). 3. A packaging box according to claim 1 or 2 , characterized in that a plug-in end (18), (18) into which both corners of the flap (4), (4) are inserted first is provided. When the bottom flaps (5) and (5) on both sides are folded inside the box to close the bottom of the box, the bottom edge flaps (5) and (5) overlap each other on the leading edge side. The packaging box according to any one of claims 1 to 3, wherein a portion (17) is formed. End panels (1), (1) constituting a pair of opposite end faces of the box and side panels (2), (2) constituting a pair of opposite side faces of the box are alternately connected via a broken line. Further, the side edges of the end panel (2) and the end panel (1) are joined to each other, and the upper surface of the box is formed from the side panels (2), (2) and the end panels (1), (1). In the packaging box in which the upper and inner flaps (7) and (7) and the upper and outer flaps (6) and (6) are respectively extended, the side panels of the upper and inner flaps (7) and (7) ( 2), a portion close to the fold line with (2) is cut obliquely to provide insertion slits (11), (11), and the upper and outer flaps (6) are inserted from the insertion slits (11), (11). , (6) both corners can be inserted inside the upper inner flaps (7), (7), and the insertion slits (11), (11 Part of the upper inner flap (7), (7) as a guide flap (12), without separating the part near the end face of the box body from the upper inner flap (7), (7) Folding lines (15), (15) for temporarily folding the corners of the upper and outer flaps (6), (6) into the insertion slits (11), (11). 15), and both ends of the fold lines (15) and (15) are bent in an arc shape toward the edge of the upper and outer flaps (6) and (6) . box. Guide flaps (12) and (12) are right-angled triangle shapes cut out by insertion slits (11) and (11) and upper and inner flaps (7) and (7) and cutting lines parallel to both side edges. Yes, the guide flaps (12), (12) are connected to the inner flaps (7), (7) via the folding lines (13), (13) parallel to the front edge of the upper inner flaps (7), (7). The packaging box according to claim 5 , wherein the packaging box is connected to the box. The upper slits (11) and (11) are cut in parallel to the side edges of the upper and inner flaps (7) and (7) at the end near the side surface of the box, and the upper and outer flaps (6), The packaging box according to claim 5 or 6 , wherein insertion ends (19) and (19) into which both corners of (6) are inserted first are provided.

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