JP2008127041A - Packaging box and method for packing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging box in which the amount of a base paper of a corrugated fiberboard used is reduced, a structure is simple, it is unnecessary to use a pressure-sensitive adhesive tape for closing a bottom part and a lid, and which can be utilized as a returnable box to be used repeatedly. <P>SOLUTION: An inner flap 21 constituting a bottom plate of the packaging box is folded into the insides of side plates 12 and 14 so as to be piled up on these side plates 12 and 14, and an outer flap 23 is bent inside at approximately 15-20° under this condition, to engage a corner part of its tip side with a circular arc-like expanding part 26 of a locking hole 25 of the inner flap 21. Under this condition, the inner flap 21 is turned in the reverse direction so as to push it outside, and under a condition that it coincides with the bottom face, the inner flap 21 and the outer flap 23 are piled up to form the bottom plate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a packaging box and a packaging method therefor, and in particular, an inner flap connected to the lower ends of a pair of side plates facing each other at a bottom opening or an upper opening and a lower end of a pair of side plates facing each other. The present invention relates to a packaging box that is closed by an outer flap and a packaging method thereof.

  Conventionally, a rectangular parallelepiped packaging box assembled by corrugated cardboard has been widely used to pack various articles for distribution. The most popular packaging box is a so-called 0201 type packaging box. In this packaging box, inner flaps and outer flaps are alternately formed at the lower ends of four side plates connected to each other in the lateral direction, and the bottom plate is assembled by folding these flaps (see FIG. 6A). . Further, on the upper end side of the four side plates, inner flaps and outer flaps are alternately formed, and these are bent together to form a lid that closes the upper opening.

  In such a packaging box, in order to fix the bottom plate constituted by the inner flap and the outer flap, the portions on the front end side of the outer flaps that face each other or face each other are joined with an adhesive tape. Similarly, the top end of the outer flap that is abutted against or opposed to each other is fixed with an adhesive tape. Therefore, when opening, the adhesive tape is peeled off. However, when the adhesive tape is peeled off, the outer flap is torn or dirty, which makes it unsuitable for repeated use.

  Therefore, for example, in Japanese Utility Model Publication No. 50-3627, four pieces constituting the side wall of the box are connected to each other through the folds at the center in the longitudinal direction of the rectangular cardboard material, and the folds are formed above and below the side walls. In the paper box in which every other inner flap and outer flap are connected through the inner flap, the inner flap is provided with a horizontal fold, and the outer flap is opened with an eight-shaped notch toward the fold. The outer flap is abutted and folded inward, the inner flap is positioned on the outer side, straddles both sides of the outer flap, and each corner portion of the free end portion of the inner flap is inserted into each of the above octagonal cuts. An assembly paper box that is locked in place is disclosed.

When the above configuration is applied to a so-called 0201 type packaging box, it is necessary to provide an adhesive tape for sealing the front end of the outer flap constituting the bottom plate and the front end of the outer flap constituting the cover plate. Disappears. However, according to the above configuration, a fold line extending in the width direction is formed at an intermediate position of the outer flap, and each corner portion of the free end portion of each inner flap is folded while bending the outer flap with such a fold line. It is designed to be inserted into an octagonal cut. Therefore, when a large force is applied in the opening direction, the outer flap is bent at the bent portion of the outer flap due to the above-mentioned force, whereby each corner portion of the free end portion of the outer flap and the cut of the inner flap Will be disengaged. In particular, when this structure is adopted for the bottom plate, the engagement of the inner flap and the outer flap constituting the bottom plate is disengaged by the weight of the contents, and a so-called bottom-out state is developed. Therefore, there is a problem that the range of use is limited.
Japanese Utility Model Publication No. 50-3627 Japanese Utility Model Publication No. 55-3055

  An object of the present invention is to provide a packaging box that does not require an adhesive tape for packaging and a packaging method thereof.

  Another object of the present invention is to provide a packaging box and its packaging method that are simple in structure and easy to assemble, and can be simply unpacked as needed.

  Still another object of the present invention is to provide a packaging box which can be folded after use and used as a returnable box many times and a packaging method thereof.

  Still another problem of the present invention is that no adhesive tape is required, and the bottom part of the bottom plate is more securely locked, so that even if a heavy weight is stored, the bottom does not fall out. It is to provide a packaging box and its packaging method.

  Still another object of the present invention is to provide a packaging box and a packaging method for the same, in which the amount of sheets to be used is small and material is not wasted.

  The above-described problems and other problems of the present invention will be made clear by the technical idea of the present invention described below and the embodiments thereof.

In the main invention of the present application, the bottom opening is closed by an inner flap connected to the lower ends of the pair of side plates facing each other and an outer flap connected to the lower ends of the other pair of side plates facing each other. In the packaging box,
Two oblique lock holes for receiving and locking the corner portion on the distal end side of the outer flap are formed in each of the inner flaps, and the lock holes are formed on the inner flap with the inner flap folded inward. A circle is attached to the tip so that the edge on the tip side of the outer flap can move when the inner flap that is folded inward is rotated to the position of the bottom surface of the packaging box while receiving the corner portion on the tip side. The present invention relates to a packaging box having an arcuate bulge.

  Here, the lock hole of the inner flap is composed of a portion having an arcuate bulging portion on the distal end side and a slit-like portion on the proximal end side, and the portion having the bulging portion is the slit shape. It is preferable that it is longer than this part. Further, it is preferable that the lock hole of the inner flap has a length of a portion having the arcuate bulging portion on the tip side twice or longer than the length of the slit-like portion. Further, it is preferable that the width of the slit-like portion of the lock hole of the inner flap is equal to or larger than the thickness of the sheet constituting the outer flap. Moreover, it is preferable that the lock hole of the said inner flap inclines at an angle of 40 to 50 degree | times with respect to the bending line between this inner flap and a side plate.

In another main invention of the present application, the upper opening is closed by an inner flap connected to the upper ends of a pair of side plates facing each other and an outer flap connected to both ends of the remaining pair of side plates facing each other. In the packaging box
An oblique fold line is formed on the outer flap for bending the corner portion on the distal end side of the outer flap, and an oblique lock hole for receiving and locking the corner portion on the distal end side of the outer flap is provided on the inner flap. Two each of the flaps are formed, and the lock holes are bent so that the corners on the tip side of the outer flaps are bent at the folding line, and the outer flaps are rotated so as to overlap the inner flaps. The present invention relates to a packaging box having an arcuate bulge on the tip side so that the edge on the tip side of the outer flap can move when the outer flap is moved.

  Here, the angle formed by the oblique fold lines on both sides of the corner portion on the tip side of the outer flap may be an angle of 85 to 95 degrees.

Still another main invention of the present application is a packaging in which an inner flap and an outer flap are provided via folding lines on the edge of the opening of the top or bottom of the packaging box in which the four peripheral walls are each composed of side plates. In the box
Each of the inner flaps is provided with a pair of lock holes cut into a C-shape into which corner portions on one side of the outer flaps on both sides are inserted, and facing each other toward the tip of the lock hole The present invention relates to a packaging box provided with a bulging arcuate bulge.

The main invention related to the packing method is that the bottom opening is closed by an inner flap connected to the lower ends of the pair of side plates facing each other and an outer flap connected to the lower ends of the other pair of side plates facing each other. In the packaging method of the packaging box,
Two oblique lock holes for receiving and locking the corner portion on the distal end side of the outer flap are formed in each of the inner flaps, and the lock holes are formed on the inner flap with the inner flap folded inward. A circle is attached to the tip so that the edge on the tip side of the outer flap can move when the inner flap that is folded inward is rotated to the position of the bottom surface of the packaging box while receiving the corner portion on the tip side. Having an arcuate bulge,
The edge portion of the corner on the tip side of the outer flap is engaged with the arcuate bulging portion in a state where the inner flap is folded so as to overlap the side plate on which the inner flap is continuously provided. The present invention relates to a packaging method of a packaging box, wherein a bottom plate is formed by closing a bottom opening by the inner flap and the outer flap by rotating the inner flap outward.

Still another main invention related to the packing method is that an upper flap is connected to the upper ends of a pair of side plates facing each other and an outer flap connected to both ends of the remaining pair of side plates facing each other. In the packaging method of the packaging box to be closed,
An oblique fold line is formed on the outer flap for bending the corner portion on the distal end side of the outer flap, and an oblique lock hole for receiving and locking the corner portion on the distal end side of the outer flap is provided on the inner flap. Two each of the flaps are formed, and the lock holes are bent so that the corners on the tip side of the outer flaps are bent at the folding line, and the outer flaps are rotated so as to overlap the inner flaps. An arcuate bulge on the tip side so that the edge on the tip side of the outer flap can move when
The outer flap is rotated so that the outer flap overlaps the inner flap in a state where the corner portion on the tip side of the outer flap is bent at the folding line and engaged with the lock hole. Thus, the present invention relates to a packaging method for a packaging box, wherein an upper opening is closed by the outer flap and the inner flap to form a cover plate.

  In the main invention of the present application, the bottom opening is closed by an inner flap connected to the lower ends of the pair of side plates facing each other and an outer flap connected to the lower ends of the other pair of side plates facing each other. In the packaging box, two oblique lock holes for receiving and locking the corner portion on the tip side of the outer flap are formed in each of the inner flaps, and the lock holes of the outer flap are folded inwardly. An arcuate shape is formed at the tip so that the edge on the tip side of the outer flap can be moved when the inner flap that is folded inside is received and the inner flap that is folded inside is rotated to the bottom position of the packaging box. It has a bulging portion.

  Therefore, according to such a packaging box, the corner portion on the front end side of the outer flap is engaged with the lock hole of the inner flap, and the inner flap folded inward in this state is rotated to the position of the bottom surface of the packaging box. By doing so, the edge on the tip side of the outer flap is moved by the arcuate bulging portion, and the inner flap and the outer flap are overlapped with each other at the bottom surface to constitute the bottom portion, and a bottom plate that can withstand a large load is assembled. It will be.

  In another main invention of the present application, the upper opening is closed by an inner flap connected to the upper ends of a pair of side plates facing each other and an outer flap connected to both ends of the remaining pair of side plates facing each other. In the package box, an oblique fold line is formed on the outer flap to bend the corner portion on the front end side of the outer flap, and the diagonal lock that receives and locks the corner portion on the front end side of the outer flap Two holes are formed in each inner flap, and the lock holes are received by bending the corner portion on the tip side of the outer flap at the folding line and rotating the outer flap so that it overlaps the inner flap. An arcuate bulging portion is provided on the distal end side so that the edge on the distal end side of the outer flap can be moved.

  Therefore, according to such a packaging box, the outer flap is overlapped with the inner flap in a state where the corner portion on the front end side of the outer flap is bent at the folding line and engaged with the lock hole of the inner flap. When it is turned, the edge on the front end side of the outer flap moves in the arc-shaped bulged portion of the lock hole, whereby the outer flap overlaps with the inner flap to form a cover plate, and the upper opening is closed. Will be. Therefore, the upper opening can be closed and locked by a simple operation and simple operation.

  The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 shows a developed corrugated cardboard 10 for assembling a packaging box according to the present embodiment. The corrugated cardboard 10 has side plates 11, 12, 13, 14 connected to each other via a fold line 15 in a lateral direction so as to be foldable. In FIG. 1, a joining piece 17 is joined to the right end of the right side plate 14 via a fold line 16, and the joining piece 17 is glued to the end portion of the opposite side plate 11 to obtain four sheets. The side plates 11, 12, 13, and 14 are assembled into a square tube shape.

  An inner flap 21 is connected to a lower end side of the side plates 12 and 14 via a fold line 20. On the other hand, an outer flap 23 is connected to the lower end side of the side plates 11 and 13 via a fold line 22. Each inner flap 21 is formed with a pair of lock holes 25 so as to form a reverse letter C.

  On the other hand, an inner flap 31 is connected to the upper ends of the bottom plates 12 and 14 via a fold line 30, and the inner flap 31 is connected to each other in the same manner as the lower inner flap 21. A lock hole 25 is formed so as to form a square shape. Further, an outer flap 33 is connected to the upper ends of the side plates 11 and 13 via a fold line 32. These outer flaps 33 are formed with a fold line 36 in a V shape so that the angles are substantially 90 degrees with each other. The outer flap 33 is bent in a mountain shape by such a folding line 36 (see FIG. 5A).

  Next, an assembly and packaging method for such a packaging box will be described. As shown in FIG. 2A, by bending the four side plates 11, 12, 13, and 14 at the fold line 15, and further bonding the joining piece 17 to the end portion of the opposite side plate 11, The corrugated base paper 10 is bent into a rectangular tube shape as shown in FIG. 2A. Then, as shown in FIGS. 2A, 2B, and 3A, the pair of inner flaps 21 on the bottom side is bent so as to substantially overlap the side plates 12 and 14 with which the inner flaps 21 are connected. Accordingly, the inner flaps 21 on both sides are bent inward at an angle of about 180 degrees or close thereto.

  In such a state, as shown in FIG. 2B and FIG. 3A, the outer flap 23 connected to the lower ends of the side plates 11 and 13 is, for example, the first so that it is slightly inside the bottom surface of the packaging box. Bend about 105-110 degrees from the position. As a result, the corner portion on the front end side of the outer flap 23 is engaged with the arcuate bulged portion 26 of the lock hole 25. That is, as for the lock hole 25, the front end portion is an arcuate bulge portion 26, and the proximal end portion is a slit portion 27 (see FIG. 7). Here, the slit-like portion 27 is set to have a width at least approximately equal to or slightly larger than the thickness of the corrugated base paper 10 so as to receive the outer flap 23.

  With the outer flap 23 folded in this way and the corners at both ends of the outer flap 23 engaged with the arcuate bulged portion 26 of the lock hole 25 of the inner flap 21, this time FIG. As shown to 3B, a hand is put from the inner side of this packaging box, and it is bent so that a pair of inner flaps 21 may be pushed outward. That is, since the inner flap 21 is bent so as to overlap the inner side of the side plates 12 and 14, the inner flap 21 is rotated outward by an angle close to approximately 90 degrees. Then, the edge portion on the front end side of the outer flap 23 moves along the edge of the arcuate bulged portion 26 of the lock hole 25 of the inner flap 21, and the outer flap 23 is flush with the bottom surface of the packaging box. It will be rotated as follows. When the inner flap 21 is rotated to the same angle as the bottom surface, the inner flap 21 and the outer flap 23 are superposed on each other, whereby the bottom plate is assembled with the engagement structure of the inner flap 21 and the outer flap 23. It will be.

  Next, the operation of closing the upper opening will be described with reference to FIGS. As described above, when the bottom plate is formed by the inner flap 21 and the outer flap 23 and the bottom opening is closed, a predetermined article is stored in the packaging box in this state. That is, packing is performed. Thereafter, the upper opening is closed by the inner flap 31 and the outer flap 33. 4A and 5A, the upper opening is closed by the inner flap 31 from the side plates 12 and 14 side. In this operation, the inner flap 31 is bent about 90 degrees at the fold line 30.

  Then, as shown in FIGS. 4A and 5A, the corner portion on the front end side of the outer flap 33 is obliquely bent at the folding line 30 and the corner portion on the front end side of the outer flap 33 is formed. Is inserted into the arcuate bulged portion 26 of the lock hole 25 of the inner flap 31. In this state, the outer flap 33 is bent 90 degrees with respect to the side plates 11 and 13 by the fold line 32. At this time, the portion of the fold line 36 of the outer flap 33 gradually becomes horizontal, and as a result, as shown in FIGS. 4B and 5B, the outer flap 33 almost overlaps with the inner flap 31 so that the lid is closed. The plate is made up. In this state, the corner portion of the outer flap 33 on the front end side is inserted into the arc-shaped bulged portion 26 of the lock hole 25, thereby locking the outer flap 33 in a state where it overlaps with the inner flap 31. Will be.

  When unpacking the packaging box, contrary to the above-described locking operation, the outer flap 33 is folded in a chevron at the folding line 36 and the corner portion on the front end side of the outer flap 33 is moved to the inner flap. What is necessary is just to make it detach | leave from the lock hole 25 of 31. This facilitates unpacking.

  Such a packaging box has an outer flap 23 in a state in which the assembly structure of the bottom part constituting the bottom plate is folded so that the inner flap 21 is substantially overlapped with the side plates 12 and 14 inside the side plates 12 and 14. Is engaged with the lock hole 25 of the inner flap 21, and thereafter, the inner flap 21 is bent and assembled so as to be pushed outward. Therefore, the engagement structure of the inner flap 21 and the outer flap 23 at the bottom cannot be released unless the order of the locking operation is reversed. Therefore, especially when an article is stored inside the packaging box, the bottom cannot be opened. In addition, since the outer flap 23 is not formed with a fold line extending in the width direction, the outer flap 23 does not come off from the lock hole 25 of the inner flap 21 due to the weight of the article to be packed. Will no longer occur. In addition, in the lock structure on the lid side of the upper surface, a folding line 36 is formed in the outer flap 33 in a V shape so that the inner flap 31 can be locked with the lock hole 25, and this is bent in a mountain shape. Therefore, the structure is different from the bottom plate at the bottom.

  Moreover, after unpacking and taking out the article accommodated in such a packaging box, such a packaging box performs the reverse operation to the packing operation shown in FIGS. 2 and 3, and the inner flap 21 constituting the bottom plate from the outside. And the outer flap 23 are pushed inward, so that the corner portion of the outer flap 23 is detached from the lock hole 25 of the inner flap 21. Accordingly, the bottom plate portion is thereby disassembled into a cylindrical shape. Therefore, it becomes possible to fold such a cylindrical packaging box flatly. Moreover, it can be used as a returnable box in such a folded state. In this case, since no adhesive tape is used on either the bottom plate side or the lid side, the packaging box can be used repeatedly until it is damaged.

  In addition, as is apparent from FIG. 6, such a packaging box uses the same amount of base paper as a conventional 0201 type packaging box. That is, in the case of a packaging box having the same volume, the packaging box of the present embodiment has the shape of the corrugated cardboard and the outer shape for assembling the conventional 0201 type packaging box shown in FIG. 6A as shown in FIG. 6B. Substantially the same shape and dimensions. Therefore, the amount of cardboard base paper used does not increase.

  FIG. 6C shows the corrugated paper 10 when the lid side structure is a double lock structure and the bottom plate side structure is a semi-automatic structure. In this case, in particular, the amount of base paper used increases due to the overlap of the flaps on the bottom side of the packaging box. Further, since the upper flaps are abutted and overlapped with each other at the upper part, a larger amount of corrugated paper is used, which significantly increases the amount of paper used. Compared with the corrugated board shown in FIG. 6C, the corrugated board of the present embodiment shown in FIG. 6B uses about 1/3 less corrugated board.

  Next, a major feature of the packaging box of this embodiment, the shape of the lock hole of the inner flap 21 constituting the bottom plate will be described with reference to FIGS. In FIG. 7, the dimension A from the side end in the width direction of the inner flap 21 to the tip of the arcuate bulged portion 26 of the lock hole 25 is the length from the base end side contacting the fold line 22 of the outer flap 23 to the tip. Approximately equal and automatically determined. The distance B from the side end of the inner flap 21 to the end of the slit-like portion 27 of the lock hole 25 is the starting point of a notch with an inclination angle of 45 degrees. Therefore, if the distance C of the arcuate bulging portion 26 of the lock hole 25, particularly the length direction of the inner flap 21, is determined, the position B is automatically determined. The dimension of C is a value more than half of the length E of the inner flap 21 and is suitably set in the range of 0.5E to 0.7E. When the value of C is larger than that, it becomes difficult to lock, and when the value of C is shorter than that, the lock becomes sweet.

  Further, the radius R of the arc of the arcuate bulging portion 26 is such that when the inner flap 21 is rotated outward in order to assemble the bottom plate, the edge portion on the tip side of the outer flap 23 moves relative to the lock hole 25. Is determined by the trajectory of the edge as it moves. Thus, when the radius R of the arc of the arcuate bulging portion 26 is set so as to correspond to the locus of the edge on the front end side of the outer flap 23, the inner flap 21 is smoothly rotated, and a reliable lock is achieved. Is achieved. The arc-shaped bulging portion 26 of the lock hole 25 on the lid side is rotated from the state in which the outer flap 33 is bent in a mountain shape at the folding line 36 to be flattened and overlapped with the inner flap 31. It is set by the locus in the lock hole 25 at the edge portion on the tip side of 33. It should be noted that the arc-shaped bulged portion 26 of the lock hole 25 of the inner flap 21 on the bottom side and the arc-shaped bulged portion 26 of the lock hole 25 of the inner flap 31 on the lid side are substantially the same. The angle between the tip of the arcuate bulging portion 26 and the root portion of the inner flap 21 is preferably 45 ° ± 5 °, that is, in the range of 40 to 50 °.

  Next, the dimensional ratio in the length direction between the arc-shaped bulged portion 26 and the slit-shaped portion 27 of the lock hole 25 will be described. When the length of the arcuate bulging portion 26 in the same direction relative to the length of the slit upper portion 27 is shorter than the slit-shaped portion 27, the edge of the tip side on the rotation of the outer flaps 23, 33 is There is a possibility that the movement of the portion in the lock hole 25 is not performed smoothly. Therefore, at least the length of the arcuate bulging portion 26 needs to be longer than the length of the slit-like portion 27. More preferably, the arc-shaped bulging portion 26 is twice or more the slit-shaped portion 27. The ratio of the length of the arcuate bulge portion 26 to the sum of the lengths of the arcuate bulge portion 26 and the slit-like portion 27 may be about 3/5.

  Next, when the distance between the tips of the arcuate bulging portions 26 of the lock holes 25 formed in the inner flap 21 is too close as shown in FIG. There is a possibility that the parts break and are connected to each other. Therefore, when the distance between the tips of the arcuate bulges 26 is too short, the length of the outer flap 23 locked by the lock hole 25 is shortened as shown in FIG. 9A. At the same time, the dimension C shown in FIGS. 7 and 8 is also shortened.

  As described above, the packaging box according to the present embodiment does not use an adhesive tape for packing and locking, and locks and packs both the bottom and the lid using the lock holes 25. Here, as shown in FIG. 6C, the conventional lock structure increases the amount of use of corrugated cardboard sheets because of extra material removal. In the present invention, the amount of use of such cardboard sheets increases. do not do. In addition, packaging can be performed without requiring time for assembling a complicated assembly box. Since no adhesive tape is used, it can be used as a returnable box. Further, instead of the corrugated base paper 10, plastic corrugated cardboard can also be used. Use of such plastic cardboard is particularly effective for use as a returnable folding box. In addition, when a paper cardboard is used as the corrugated cardboard 10, a double structure corrugated cardboard sheet in which the A flute and the B flute are overlapped can be handled.

  Although the present invention has been described above with reference to the illustrated embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, the cardboard base paper 10 in the above embodiment may be composed of a double cardboard sheet or a plastic cardboard. Also, the dimensions and size of the box can be changed to various dimensions according to the size and weight of the article to be packed.

  The present invention can be used as a packaging box for supplying electronic equipment to physical distribution.

It is an expansion | deployment top view of the corrugated cardboard for assembling a packaging box. It is a perspective view which shows the lock | rock operation | movement of the bottom part of the packaging box assembled with this corrugated cardboard. It is a principal part expansion perspective view which shows the same locking operation. It is a perspective view which shows the operation | movement which obstruct | occludes upper opening. It is a perspective view which shows the operation | movement which obstruct | occludes and locks an upper opening. It is a top view of the state which compared the usage-amount of the cardboard which assembles this packaging box with the usage-amount of the cardboard of another packaging box. It is a top view of the inner flap which shows the dimension of a lock hole. It is a top view which shows the structure of the bottom face locked by the lock hole of the inner flap. It is a top view which shows arrangement | positioning of the lock hole when the lock hole of an inner flap adjoins.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Corrugated cardboard, 11-14 ... Side plate, 15, 16 ... Bending line, 17 ... Joining piece, 20 ... Bending line, 21 ... Inner flap, 22 ... Folding line, 23 ... Outer flap, 25 ... Lock hole , 26 ... arc-shaped bulging part, 27 ... slit-like part, 30 ... fold line, 31 ... inner flap, 32 ... fold line, 33 ... outer flap, 36 ... fold line

Claims (10)

In the packaging box which is configured to close the bottom opening by the inner flap connected to the lower ends of the pair of side plates facing each other and the outer flap connected to the lower ends of the remaining pair of side plates facing each other,
Two oblique lock holes for receiving and locking the corner portion on the distal end side of the outer flap are formed in each of the inner flaps, and the lock holes are formed on the inner flap with the inner flap folded inward. A circle is attached to the tip so that the edge on the tip side of the outer flap can move when the inner flap that is folded inward is rotated to the position of the bottom surface of the packaging box while receiving the corner portion on the tip side. A packaging box having an arcuate bulge.   The lock hole of the inner flap is composed of a portion having an arcuate bulging portion on the distal end side and a slit-like portion on the proximal end side, and the portion having the bulging portion is more than the slit-like portion. The packaging box according to claim 1, wherein the packaging box is long.   The length of the portion having the arcuate bulged portion on the tip side of the lock hole of the inner flap is twice or longer than the length of the slit-like portion. 2. The packaging box according to 2.   The packaging box according to claim 1 or 2, wherein the width of the slit-like portion of the lock hole of the inner flap is larger than the thickness of the sheet constituting the outer flap.   The packaging hole according to claim 1 or 2, wherein the lock hole of the inner flap is inclined at an angle of 40 to 50 degrees with respect to a fold line between the inner flap and the side plate. box. In the packaging box which is configured to close the upper opening by the inner flap connected to the upper ends of the pair of side plates facing each other and the outer flap connected to both ends of the remaining pair of side plates facing each other,
An oblique fold line is formed on the outer flap for bending the corner portion on the distal end side of the outer flap, and an oblique lock hole for receiving and locking the corner portion on the distal end side of the outer flap is provided on the inner flap. Two each of the flaps are formed, and the lock holes are bent so that the corners on the tip side of the outer flaps are bent at the folding line, and the outer flaps are rotated so as to overlap the inner flaps. A packaging box having an arcuate bulging portion on the tip side so that the edge on the tip side of the outer flap can move when the outer flap is moved.   The packaging box according to claim 6, wherein an angle formed by oblique fold lines on both sides for bending a corner portion on the tip side of the outer flap is an angle of 85 to 95 degrees. In the packaging box in which the inner flap and the outer flap are provided on the edge of the opening of the upper part or the bottom part of the packaging box in which the four circumferential walls are each constituted by side plates, respectively, via folding lines,
Each of the inner flaps is provided with a pair of lock holes cut into a C-shape into which corner portions on one side of the outer flaps on both sides are inserted, and facing each other toward the tip of the lock hole A packaging box, characterized in that an arcuate bulging portion bulging is provided. In the packaging method of the packaging box, the bottom opening is closed by the inner flap connected to the lower ends of the pair of side plates facing each other and the outer flap connected to the lower ends of the remaining pair of side plates facing each other.
Two oblique lock holes for receiving and locking the corner portion on the distal end side of the outer flap are formed in each of the inner flaps, and the lock holes are formed on the inner flap with the inner flap folded inward. A circle is attached to the tip so that the edge on the tip side of the outer flap can move when the inner flap that is folded inward is rotated to the position of the bottom surface of the packaging box while receiving the corner portion on the tip side. Having an arcuate bulge,
The edge portion of the corner on the tip side of the outer flap is engaged with the arcuate bulging portion in a state where the inner flap is folded so as to overlap the side plate on which the inner flap is continuously provided. A packaging method for a packaging box, wherein a bottom plate is formed by closing the bottom opening by the inner flap and the outer flap by rotating the inner flap outward in a state where the inner flap is turned. In the packaging method of the packaging box, the upper opening is closed by the inner flap connected to the upper ends of the pair of side plates facing each other and the outer flap connected to both ends of the remaining pair of side plates facing each other.
An oblique fold line is formed on the outer flap for bending the corner portion on the distal end side of the outer flap, and an oblique lock hole for receiving and locking the corner portion on the distal end side of the outer flap is provided on the inner flap. Two each of the flaps are formed, and the lock holes are bent so that the corners on the tip side of the outer flaps are bent at the folding line, and the outer flaps are rotated so as to overlap the inner flaps. An arcuate bulge on the tip side so that the edge on the tip side of the outer flap can move when
The outer flap is rotated so that the outer flap overlaps the inner flap in a state where the corner portion on the tip side of the outer flap is bent at the folding line and engaged with the lock hole. Thus, the upper opening is closed by the outer flap and the inner flap to form a cover plate.

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