JP7582060B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box.

Packaging boxes are widely used for transporting goods. For example, Patent Document 1 describes a packaging box with a continuous break line around the circumference of the body. The length and width faces of the body are provided with a first operating section and a second operating section into which fingers or the like are inserted, at positions that overlap with the break line that serves as a cutting assistance line. The packaging box described in Patent Document 1 is opened by inserting fingers into the first operating section and the second operating section and pulling up the upper part above the break line.

International Publication No. 2018/235789

However, in the case of the above-mentioned packaging boxes, when multiple packaging boxes are stacked during transportation, etc., the weight of the packaging boxes stacked on top of each other may cause the weaker portion of the body of the lower packaging box at the break line to deform and bulge outward.

A packaging box for solving the above problem includes a body having a pair of first side surfaces and a pair of second side surfaces, a pair of inner flaps connected to the upper edges of each of the first side surfaces, and a pair of outer flaps connected to the upper edges of each of the second side surfaces, where at least one of the pair of second side surfaces is a cuttable surface, and the outer flap of the pair of outer flaps connected to the cuttable surface is a cuttable flap, the body has a pair of first cutting assistance lines at edges between the cuttable surface and each surface connected to both side edges of the cuttable surface, and the cuttable flap has a hand hole portion that becomes a hand hole penetrating the cuttable flap, and a pair of second cutting assistance lines that connect the hand hole portion to ends of each first cutting assistance line.

According to the above configuration, after forming a hand hole in the tearable flap and passing a finger through the hand hole, the tearable flap is pulled up to cut the tearable flap along the second cutting assist line. As a result, the area defined by the hand hole, the pair of second cutting assist lines, and the upper edge of the cuttable surface is cut off from the top surface. Then, by pulling down the area of the tearable flap that has been cut off from the top surface, the cuttable surface is cut along the first cutting assist line. As a result, an opening is formed in the body. Since the above operation does not require tools or a large force to open the packaging box, the packaging box can be easily opened. Furthermore, compared to a packaging box with perforations or the like provided in the circumferential direction of the body, the strength of the body is maintained, so deformation of the body can be suppressed.

In the above packaging box, the pair of inner flaps may have a cutout portion located below the hand hole portion. According to the above configuration, by having the inner flap have a cutout portion located below the hand hole portion, when the hand hole is formed in the outer flap, the blocking portion that blocks the hand hole in the hand hole portion can be formed without interfering with the inner flap.

In the above packaging box, the packaging box is preferably constructed by assembling blank sheets, the first side surface and the second side surface are arranged alternately in the blank sheets, and the cuttable surface is preferably a second side surface of the pair of second side surfaces that is located between the pair of first side surfaces. According to the above configuration, since the second side surface located between the pair of first side surfaces in the blank sheet state is the cuttable surface, the first cutting assistance line can be cut more easily than, for example, a configuration in which the blank sheet state has one end connected to the first side surface and the other end connected to a seam, and the second side surface is the cuttable surface.

The packaging box may further include a bottom flap connected to the lower edge of the cuttable surface, and a fourth cutting auxiliary line connecting the pair of first cutting auxiliary lines at the edge between the cuttable surface and the bottom flap. According to the above configuration, by providing a fourth cutting auxiliary line at the edge between the cuttable surface and the bottom flap, the cuttable flap cut along the second cutting auxiliary line and the cuttable surface cut along the first cutting auxiliary line can be separated from the packaging box by cutting the fourth cutting auxiliary line. This makes it easier to remove items contained in the packaging box, for example, and also makes it possible to use the packaging box preferably for purposes such as displaying the items contained therein.

In the above packaging box, the hand hole portion may include a line connecting the ends of the pair of second cutting assist lines, a pair of notches extending from both ends of the line, a third cutting assist line connecting the pair of notches, and a closing portion defined by the line, the pair of notches, and the third cutting assist line. According to the above configuration, by pushing the closing portion toward the inside of the packaging box, the closing portion is bent toward the inside of the packaging box with the line as a fulcrum, and a hand hole is formed in the cuttable flap. At this time, since the hand hole portion includes the line, the closing portion is not cut off from the cuttable flap even after the hand hole is formed in the cuttable flap, and it is possible to prevent the generation of unnecessary cut pieces.

In the above packaging box, it is preferable that the line is provided closer to the upper edge of the cuttable surface than the third cutting assist line. According to the above configuration, the line is provided closer to the upper edge of the cuttable surface than the third cutting assist line, so that the closed portion is cut off from the top surface along with the area defined by the line, the pair of second cutting assist lines, and the upper edge of the cuttable surface. Therefore, since the closed portion does not remain on the top surface, it is possible to easily remove the contents contained in the packaging box from the opening formed in the body.

According to the present invention, the packaging box can be easily opened while preventing deformation of the body.

FIG. 2 is a perspective view of the packaging box according to the first embodiment, seen from above. FIG. 2 is a plan view of a blank sheet for manufacturing a packaging box in the first embodiment. FIG. 11 is a perspective view of the packaging box according to the first embodiment, showing a state in which the inner flaps are folded in the assembling process. FIG. 11 is a perspective view of a state in which a hand hole is formed in a top surface during a process of opening the packaging box in the first embodiment. 13 is a perspective view of a state in which a second cutting assist line is cut in a process of opening the packaging box in the first embodiment. FIG. FIG. 2 is a perspective view of the packaging box according to the first embodiment in an opened state. FIG. 11 is a perspective view of a packaging box according to a second embodiment, seen from above. FIG. 11 is a plan view of a blank sheet for manufacturing a packaging box in a second embodiment.

[First embodiment]
A first embodiment of the present invention will now be described with reference to FIGS.
As shown in Fig. 1, the packaging box 1 is a corrugated cardboard box having a rectangular parallelepiped shape. The packaging box 1 adopts a general-purpose grooved shape called 0201 type in JIS-Z1507 as its basic structure. The packaging box 1 is used, for example, for transporting goods.

The packaging box 1 has a body 10, a bottom surface 20, and a top surface 30. The body 10 has a rectangular cylindrical shape. Various items are stored in the body 10 as contents. The bottom surface 20 closes the lower side of the body 10. The top surface 30 closes the upper side of the body 10.

The body 10 has opposing end walls 11, 13 which are an example of a first side surface, and opposing side walls 12, 14 which are an example of a second side surface. The end walls 11, 13 have a rectangular shape of the same size and form a pair of width surfaces in the body 10. The side walls 12, 14 have a rectangular shape of the same size and form a pair of length surfaces in the body 10. In the circumferential direction of the body 10, the dimension of the end walls 11, 13 which is the width direction of the packaging box 1 is shorter than the dimension of the side walls 12, 14 which is the length direction of the packaging box 1. Note that in the circumferential direction of the body 10, the dimension of the end walls 11, 13 and the dimension of the side walls 12, 14 may be the same.

The side wall 12 is a cuttable surface configured to be cuttable with respect to the end walls 11, 13 connected to both side edges of the side wall 12. The body 10 has first cutting assistance lines 16 at both ends in the longitudinal direction of the side wall 12, at the edges between the end walls 11 and the side wall 12, and at the edges between the side walls 12 and the end walls 13. The first cutting assistance lines 16 are configured to be cuttable, and as an example, are zipper-shaped cuts that are provided intermittently. Note that the first cutting assistance lines 16 are not limited to zipper-shaped cuts as long as they are configured to be cuttable, and may be, for example, perforations.

The top surface 30 has inner flaps 31, 33 and outer flaps 32, 34. The inner flap 31 is connected to the upper edge of the end wall 11. The inner flap 33 is connected to the upper edge of the end wall 13. The inner flaps 31, 33 have a roughly rectangular shape of the same size. The outer flap 32 is connected to the upper edge of the side wall 12. The outer flap 34 is connected to the upper edge of the side wall 14. The outer flaps 32, 34 have a roughly rectangular shape of the same size.

The top surface 30 is formed by folding outer flaps 32, 34 above inner flaps 31, 33 that are folded inward. As an example, the outer flaps 32, 34 are butted flaps. The outer flaps 32, 34 are butted against each other and joined by a joining means such as adhesive tape or hot melt adhesive.

The outer flap 32 is a cuttable flap that has a structure for cutting off a portion of the outer flap 32 from the top surface 30. The outer flap 32 has a hand hole portion 35 and a pair of second cutting assist lines 36. The hand hole portion 35 is a structure for forming a hand hole 37 (see FIG. 4) in the outer flap 32.

The pair of second cutting assist lines 36 are configured to be cuttable, and as one example, are zipper-shaped cuts that are provided intermittently. Each second cutting assist line 36 is provided to connect the hand hole portion 35 and the end of each first cutting assist line 16. Note that the second cutting assist lines 36 are not limited to zipper-shaped cuts as long as they are configured to be cuttable, and may be, for example, perforations.

The inner flaps 31, 33 have notches 31a, 33a at their tips. The notches 31a, 33a are areas cut out so that the distance from the base end to the tip of the inner flaps 31, 33 is shorter than in other areas. The notches 31a, 33a are areas on the side wall 12 side at the tips of the inner flaps 31, 33, and are provided so as to be located below the hand hole 35 of the outer flap 32.

[Blank sheet]
As shown in Fig. 2, the packaging box 1 is composed of a one-piece blank sheet 2. The blank sheet 2 is provided at the center with an end wall 11, a side wall 12, an end wall 13, a side wall 14, and a seam 15 arranged in this order. When assembling the packaging box 1, the seam 15 is joined to the end wall 11 by a joining means such as a staple, an adhesive, or an adhesive tape.

A first cutting assist line 16 is provided at the boundary between the end wall 11 and the side wall 12, and at the boundary between the side wall 12 and the end wall 13. The first cutting assist line 16 extends from the upper edge to the lower edge of the side wall 12. The end wall 11 and the end wall 13 are configured to be bendable relative to the side wall 12 via the first cutting assist line 16.

Body creases 17 are provided at the boundaries between the end walls 13 and the side walls 14, and at the boundaries between the side walls 14 and the seams 15. The body creases 17 are compression grooves that do not require cutting. The end walls 13 and the seams 15 are configured to be bendable relative to the side walls 14 via the body creases 17.

The bottom inner flap 21 is connected to the lower edge of the end wall 11 via the lower crease 18a. The inner flap 31 is connected to the upper edge of the end wall 11 via the upper crease 19a. The bottom outer flap 22 is connected to the lower edge of the side wall 12 via the lower crease 18b. The outer flap 32 is connected to the upper edge of the side wall 12 via the upper crease 19b. The bottom inner flap 23 is connected to the lower edge of the end wall 13 via the lower crease 18c. The inner flap 33 is connected to the upper edge of the end wall 13 via the upper crease 19c. The bottom outer flap 24 is connected to the lower edge of the side wall 14 via the lower crease 18d. The outer flap 34 is connected to the upper edge of the side wall 14 via the upper crease 19d.

The lower creases 18a-18d and the upper creases 19a-19d are compressed grooves that are not intended to be cut. The bottom inner flaps 21, 23 and the bottom outer flaps 22, 24 are configured to be bendable relative to the end walls 11, 13 and side walls 12, 14 via the lower creases 18a-18d. The inner flaps 31, 33 and the outer flaps 32, 34 are configured to be bendable relative to the end walls 11, 13 and side walls 12, 14 via the upper creases 19a-19d.

The bottom inner flaps 21, 23 and the bottom outer flaps 22, 24 are examples of bottom flaps that make up the bottom 20. Specifically, the bottom 20 is formed by folding the bottom outer flaps 22, 24, which are butt flaps, below the bottom inner flaps 21, 23 that are folded inward. The bottom outer flaps 22, 24 are joined by a joining means such as adhesive, adhesive tape, or staples.

The outer flap 32 has a pair of second cutting assist lines 36. The pair of second cutting assist lines 36 have a shape that is symmetrical with respect to the hand hole 35. Each second cutting assist line 36 has a straight line shape that extends obliquely from the upper end of each first cutting assist line 16 toward the hand hole 35 provided in the center of the outer flap 32.

The hand hole portion 35 includes a crease 35a, a pair of cuts 35b, a third cutting assist line 35c, and a blocking portion 35d. The crease 35a is a compressed groove that does not assume cutting and connects the ends of a pair of second cutting assist lines 36. The crease 35a is a straight line parallel to the upper crease 19b.

The pair of cuts 35b are cuts that penetrate the outer flap 32 in the thickness direction. The pair of cuts 35b extend from both ends of the line 35a, i.e., from each intersection of the line 35a and the pair of second cutting assist lines 36, toward the tip of the outer flap 32, and have a generally arc-like shape that curves toward each other. In other words, the pair of cuts 35b are curved lines that extend from both ends of the line 35a, and are also curved lines that are continuous with each of the second cutting assist lines 36.

The third cutting assist line 35c is configured to be cuttable, and is, for example, a perforation. The third cutting assist line 35c is a straight line connecting the ends of the pair of notches 35b, and has a straight line shape parallel to the line 35a. In other words, the line 35a, the pair of notches 35b, and the third cutting assist line 35c are configured in a ring shape. In addition, the line 35a is positioned closer to the upper line 19b than the third cutting assist line 35c.

The closed portion 35d is an area defined by the line 35a, a pair of cuts 35b, and the third cutting assist line 35c. When the packaging box 1 is assembled, the closed portion 35d is pressed toward the body 10 to cut the third cutting assist line 35c, and the closed portion 35d is then bent with the line 35a as a fulcrum to form a hand hole 37 in the outer flap 32.

The outer flap 32 is divided into three regions, the closed portion 35d, the opening portion 32a, and the remaining portion 32b, by the pair of second cutting auxiliary lines 36, the line 35a, the pair of cuts 35b, and the third cutting auxiliary line 35c. The opening portion 32a is a substantially trapezoidal region divided by the upper line 19b, the pair of second cutting auxiliary lines 36, and the line 35a. The remaining portion 32b is the region of the outer flap 32 other than the closed portion 35d and the opening portion 32a. In other words, the remaining portion 32b is the region divided by both side edges and the tip of the outer flap 32, the pair of second cutting auxiliary lines 36, the pair of cuts 35b, and the third cutting auxiliary line 35c.

The inner flaps 31, 33 have a symmetrical shape with respect to the outer flap 32. The inner flaps 31, 33 have cutouts 31a, 33a. The cutouts 31a, 33a have an arc-shaped portion that extends from approximately the center of the tip of the inner flap 31, 33 toward the base end of the inner flap 31, 33 while approaching the outer flap 32. The cutouts 31a, 33a have a linear portion that extends from the arc-shaped portion toward the outer flap 32 to the side edge of the inner flap 31, 33.

The cutouts 31a, 33a are configured to be large enough not to overlap the closing portion 35d when the blank sheet 2 is assembled into the packaging box 1, in order to prevent interference between the closing portion 35d and the inner flaps 31, 33 when the hand hole 37 is formed in the outer flap 32. If there is no interference between the closing portion 35d and the inner flaps 31, 33 when the hand hole 37 is formed, the cutouts 31a, 33a may overlap any of the ruled line 35a, the pair of notches 35b, and the third cutting assist line 35c that define the closing portion 35d when the packaging box 1 is in a state where the blank sheet 2 is assembled.

[Packing box assembly process]
The assembly process of the packaging box 1 will be described below.
First, the seam 15 and the end wall 11 are joined to the blank sheet 2 using a joining means such as an adhesive to form the rectangular tubular body 10. Next, the bottom inner flaps 21, 23 are folded inward. Furthermore, the bottom outer flaps 22, 24 are folded and positioned below the bottom inner flaps 21, 23. The bottom outer flaps 22, 24 are then joined by a joining means to form the bottom 20. With the body 10 and bottom 20 in place, a product or the like to be contained is placed in the body 10.

Next, as shown in FIG. 3, the inner flaps 31, 33 are folded inward. Furthermore, the outer flaps 32, 34 are folded inward and positioned above the inner flaps 31, 33. The outer flaps 32, 34 are then butted together and joined by a joining means such as adhesive tape to form the top surface 30. This places the packaging box 1 in the assembled state shown in FIG. 1.

[Opening the packaging box process]
The process of opening the packaging box 1 will now be described.
As shown in Fig. 4, first, the blocking portion 35d of the outer flap 32 is pressed toward the body 10 with a finger. This causes the third cutting assist line 35c to be cut, and the blocking portion 35d is folded toward the inside of the body 10 with the line 35a as a fulcrum. As a result, a hand hole 37 penetrating the outer flap 32 is formed in the area of the outer flap 32 where the blocking portion 35d was provided.

By providing the cutouts 31a, 33a on the inner flaps 31, 33, the hand hole 37 can be formed without the blocking portion 35d interfering with the inner flaps 31, 33. Even after the hand hole 37 is formed in the outer flap 32, the blocking portion 35d remains connected to the opening portion 32a via the line 35a, so no unnecessary cut pieces are generated.

As shown in FIG. 5, the closing portion 35d and the opening portion 32a are then grasped and pulled up together with fingers passing through the hand hole 37. This causes the outer flap 32 to be cut along a pair of second cutting assist lines 36. As a result, the closing portion 35d and the opening portion 32a are cut off from the top surface 30 while the remaining portion 32b remains on the top surface 30.

At this time, since the pair of second cutting assist lines 36 are straight lines extending from the hand hole portion 35 toward each of the first cutting assist lines 16, the force exerted when the opening portion 32a is pulled up can be appropriately applied to the second cutting assist lines 36.

Finally, as shown in FIG. 6, the closing portion 35d and the opening portion 32a that have been cut off from the top surface 30 are grasped together and pulled down. This causes the side wall 12 to be cut along the first cutting assist line 16. As a result, an opening 10a for removing the contents is formed on the entire surface of the body 10 where the side wall 12 was provided. Through the above steps, the packaging box 1 is opened.

[Effects of the First Embodiment]
According to the first embodiment described above, the following effects can be obtained.
(1-1) The outer flap 32 is cut along the second cutting assist line 36, and the side wall 12 is cut along the first cutting assist line 16, thereby forming an opening 10a in the body 10 for removing the contents. The packaging box 1 can also be opened, for example, by peeling off the adhesive tape that joins the outer flaps 32, 34. However, in this case, a large force is required to peel off the adhesive tape, or a tool is required to cut the adhesive tape. In this respect, by forming the opening 10a in the body 10 and opening the packaging box 1 as in this embodiment, a large force is not required to open the packaging box 1, and no tool is required to open the packaging box 1. Therefore, the packaging box 1 can be easily opened.

In addition, compared to a packaging box in which perforations or cuts are provided in the circumferential direction of the body 10, the strength of the body 10 of the packaging box 1 is maintained to the extent that the perforations or cuts are not provided. Therefore, deformation of the body 10 when a load is applied to the packaging box 1 from above, for example, when the packaging boxes 1 are stacked, can be suppressed.

(1-2) The inner flaps 31, 33 have cutouts 31a, 33a located below the hand hole 35, which prevents interference between the closure 35d and the inner flaps 31, 33 when forming the hand hole 37 in the outer flap 32.

(1-3) In the blank sheet 2, the side wall 12 between the end walls 11 and 13 is a cuttable surface, so that the first cutting assist line 16 can be cut more easily than in a configuration in which the side wall 14 is a cuttable surface. Specifically, when the side wall 14 is a cuttable surface, the first cutting assist line 16 is provided at the boundary between the end wall 13 and the side wall 14 and at the boundary between the side wall 14 and the seam 15. In this case, the force for cutting the first cutting assist line 16 may also act as a force for peeling off the joining means between the seam 15 and the end wall 11. In this regard, in the present embodiment, the side wall 12 between the end walls 11 and 13 in the blank sheet 2 is a cuttable surface, so that the force for cutting the first cutting assist line 16 can be suitably applied to the first cutting assist line 16.

(1-4) Since the hand hole portion 35 includes the line 35a, even after the hand hole 37 is formed in the outer flap 32, the closing portion 35d is not cut off from the opening portion 32a in the outer flap 32, which prevents unnecessary cut pieces from being generated during the opening process.

(1-5) Since the crease 35a is located closer to the upper crease 19b than the third cutting assist line 35c, even after the hand hole 37 is formed, the closing portion 35d remains connected to the opening portion 32a via the crease 35a. This causes the closing portion 35d to be cut off from the top surface 30 together with the opening portion 32a. Therefore, since the closing portion 35d does not remain on the top surface 30, it is possible to easily remove the contents from the opening 10a formed in the body 10.

(1-6) The pair of second cutting assist lines 36 have a straight line shape extending from the hand hole 35 toward each of the first cutting assist lines 16, so that the force applied when the hand is passed through the hand hole 37 and the opening section 32a is pulled up can be appropriately applied to the second cutting assist lines 36.

[Second embodiment]
A second embodiment of the present invention will now be described with reference to FIGS.
7, the packaging box 41 is a cardboard box including a body 50 having an octagonal cylindrical shape, a bottom surface 60 closing the lower side of the body 50, and a top surface 70 closing the upper side of the body 50. The body 50 includes opposing first walls 51, 53 which are an example of a first side surface, opposing second walls 52, 54 which are an example of a second side surface, and four third walls 55 which connect the side edges of the first walls 51, 53 and the second walls 52, 54 to each other.

The second wall 52 is a cuttable surface configured to be cuttable with respect to each of the third walls 55 connected to both side edges of the second wall 52. The body 50 has a first cutting assistance line 57a at the edge between each of the third walls 55 connected to both side edges of the second wall 52 and the second wall 52. The first cutting assistance line 57a has a configuration similar to the first cutting assistance line 16 in the first embodiment.

The top surface 70 includes inner flaps 71, 73 and outer flaps 72, 74. The top surface 70 is configured by folding the outer flaps 72, 74 above the inner flaps 71, 73, which are folded inward. As an example, the outer flaps 72, 74 are butted flaps. The outer flaps 72, 74 are butted against each other and joined by a joining means such as adhesive tape or hot melt adhesive.

The outer flap 72 is a cuttable flap that has a structure for cutting off a portion of the outer flap 72 from the top surface 70. The outer flap 72 has a hand hole 75 and a pair of second cutting assist lines 76 that connect the hand hole 75 to the ends of each of the first cutting assist lines 57a. The hand hole 75 and the pair of second cutting assist lines 76 have the same structure as the hand hole 35 and the pair of second cutting assist lines 36 in the first embodiment.

The inner flaps 71, 73 have notches 71a, 73a at their tips. The notches 71a, 73a are provided in the area on the second wall 52 side at the tips of the inner flaps 71, 73, and are positioned below the hand hole 75 of the outer flap 72.

[Blank sheet]
8, the packaging box 41 is composed of a one-piece blank sheet 42. The blank sheet 42 has a first wall 51, a second wall 52, a first wall 53, a second wall 54, and a seam 56 arranged in this order in the center thereof, and a third wall 55 provided between each of them.

The first walls 51, 53 have rectangular shapes of the same size. The second walls 52, 54 have rectangular shapes of the same size. Each third wall 55 has a rectangular shape of the same size. Note that in the circumferential direction of the body 50, the dimensions of the first walls 51, 53 and the dimensions of the second walls 52, 54 may be different or the same.

A first cutting assist line 57a is provided at the boundary between the second wall 52 and each of the third walls 55 connected to both side edges of the second wall 52. The second wall 52 is configured to be bendable relative to each of the third walls 55 connected to both side edges of the second wall 52 via the first cutting assist line 57a.

A body crease 57b is provided at the boundary between each of the first walls 51, 53, the second wall 54, and the joint 56 and each of the third walls 55. The body crease 57b is a compression groove that does not require cutting. Each of the first walls 51, 53, the second wall 54, and the joint 56 is configured to be bendable relative to each of the third walls 55 via the body crease 57b.

The bottom inner flaps 61, 63 and bottom outer flaps 62, 64 are connected to the lower edges of the first walls 51, 53 and second walls 52, 54 via lower lines 58a-58d. The bottom inner flaps 71, 73 and outer flaps 72, 74 are connected to the upper edges of the first walls 51, 53 and second walls 52, 54 via upper lines 59a-59d.

The lower creases 58a-58d and the upper creases 59a-59d are compressed grooves that are not intended to be cut. The bottom inner flaps 61, 63 and the bottom outer flaps 62, 64 are configured to be bendable relative to the first walls 51, 53 and the second walls 52, 54 via the lower creases 58a-58d. The inner flaps 71, 73 and the outer flaps 72, 74 are configured to be bendable relative to the first walls 51, 53 and the second walls 52, 54 via the upper creases 59a-59d.

The bottom inner flaps 61, 63 are rectangular and of the same size. The bottom outer flaps 62, 64 have a trapezoidal region whose width increases from the lower lines 58b, 58d toward the tip, and a rectangular region of a constant width that extends from the tip of the trapezoidal region.

The bottom inner flaps 61, 63 and the bottom outer flaps 62, 64 are examples of bottom flaps that make up the bottom 60. The bottom 60 is formed by folding the bottom outer flaps 62, 64, which are butt flaps, below the bottom inner flaps 61, 63 that are folded inward. The bottom outer flaps 62, 64 are joined by a joining means such as adhesive, adhesive tape, or staples.

The outer flaps 72, 74 have a trapezoidal region whose width increases from the upper lines 59b, 59d toward the tip, and a rectangular region of a constant width that extends from the tip of the trapezoidal region.

The pair of second cutting assist lines 76 on the outer flap 72 are symmetrical with respect to the hand hole 75. Each second cutting assist line 76 has a straight line shape that extends obliquely from the upper end of each first cutting assist line 57a toward the hand hole 75 provided in the center of the outer flap 72.

The hand hole portion 75 of the outer flap 72 includes a line 75a, a pair of cuts 75b, a third cutting assist line 75c, and a blocking portion 75d. Each element of the hand hole portion 75 has the same configuration as the hand hole portion 35 in the first embodiment, so detailed explanations are omitted.

The outer flap 72 is divided into three areas, a closed portion 75d, an opening portion 72a, and a remaining portion 72b, by a pair of second cutting auxiliary lines 76, a line 75a, a pair of incisions 75b, and a third cutting auxiliary line 75c. The opening portion 72a is a substantially trapezoidal area divided by the upper line 59b, a pair of second cutting auxiliary lines 76, and the line 75a. The remaining portion 72b is the area of the outer flap 72 other than the closed portion 75d and the opening portion 72a.

The inner flaps 71, 73 have a generally rectangular shape that is symmetrical with respect to the outer flap 72. The cutouts 71a, 73a of the inner flaps 71, 73 are configured to be large enough not to overlap with the blocking portion 75d when the packaging box 41 is in its state. The cutouts 71a, 73a prevent interference between the blocking portion 75d and the inner flaps 71, 73 when forming a hand hole in the outer flap 72.

[Packing box assembly process]
The assembly process of the packaging box 41 will be described below.
First, the seam 56 and the first wall 51 are joined to the blank sheet 42 by a joining means such as an adhesive to form the octagonal cylindrical body 50. Next, the bottom inner flaps 61, 63 and the bottom outer flaps 62, 64 are folded, and then the bottom outer flaps 62, 64 are joined by a joining means to form the bottom 60. With the body 50 and bottom 60 in a formed state, a product or the like to be contained is placed in the body 50.

Next, the inner flaps 71, 73 and the outer flaps 72, 74 are folded, and then the outer flaps 72, 74 are butted together and joined by a joining means such as adhesive tape to form the top surface 70. This results in the packaging box 41 being in the assembled state shown in FIG. 7.

[Opening the packaging box process]
The process of opening the packaging box 41 will now be described.
First, the closing portion 75d is pressed toward the body 50 by the fingers. As a result, a hand hole penetrating the outer flap 72 is formed in the area where the closing portion 75d was provided in the outer flap 72. Next, the closing portion 75d and the opening portion 72a are grasped and pulled up together with the fingers passing through the hand hole, so that the outer flap 72 is cut along a pair of second cutting assist lines 76. As a result, the closing portion 75d and the opening portion 72a are cut off from the top surface 70. Finally, the closing portion 75d and the opening portion 72a cut off from the top surface 70 are pulled down while being grasped together, so that the second wall 52 is cut along the first cutting assist line 57a. As a result, an opening for taking out the contents is formed on the entire surface of the body 50 where the second wall 52 was provided. The packaging box 41 is opened by the above procedure.

[Effects of the second embodiment]
According to the second embodiment described above, the following effects can be obtained.
(2-1) Effects similar to those of (1-1) to (1-6) above can be obtained even in a configuration having an octagonal cylindrical body 50 like the packaging box 41. In addition, in the case of a configuration having an octagonal cylindrical body 50, the strength of the body 50 is increased by the increased number of edges between the faces of the body 50 compared to a configuration having a square cylindrical body 10. Therefore, for example, deformation of the body 50 when a load is applied from above to the packaging box 41 can be more suitably suppressed.

The first and second embodiments described above can be modified as follows.
In the first embodiment, the configuration in which the crease 35a is provided at a position closer to the upper crease 19b than the third cutting assist line 35c is illustrated. However, the present invention is not limited to this, and the third cutting assist line 35c may be provided at a position closer to the upper crease 19b than the crease 35a. In this case, the opening portion 32a is an area defined by the upper crease 19b, the pair of second cutting assist lines 36, the pair of incisions 35b, and the third cutting assist line 35c. The remaining portion 32b is an area defined by both side edges and the tip of the outer flap 32, the pair of second cutting assist lines 36, and the crease 35a. Even in this case, when the hand hole 37 is formed in the outer flap 32, the blocking portion 35d is connected to the remaining portion 32b via the crease 35a, so that it is possible to prevent unnecessary cut pieces from being generated in the opening process. The hand hole portion 75 in the second embodiment can also be modified in a similar manner.

- In the first embodiment, a configuration was exemplified in which the closure portion 35d is connected to the opening portion 32a via the line 35a even after the hand hole 37 is formed in the outer flap 32. However, this is not limited to this, and for example, a cuttable configuration such as a perforation may be provided instead of the line 35a. Even in this case, the hand hole 37 can be formed in the outer flap 32. Note that a similar change is also possible in the hand hole portion 75 in the second embodiment.

- In the first embodiment, the lower edge of the side wall 12, which is a cuttable surface, is provided with the lower line 18b at the edge between the side wall 12 and the bottom outer flap 22. However, this is not limited to this, and for example, instead of the lower line 18b, a fourth cutting auxiliary line, which is a cuttable configuration such as a perforation, may be provided to connect the pair of first cutting auxiliary lines 16. By cutting the fourth cutting auxiliary line provided at the lower edge of the side wall 12, the opening portion 32a cut along the pair of second cutting auxiliary lines 36 and the side wall 12 cut along the pair of first cutting auxiliary lines 16 can be separated from the packaging box 1. This makes it easier to take out the contents stored in the packaging box 1, for example, and also makes it possible to use the packaging box 1 preferably for purposes such as displaying the contents. The lower line 58b in the second embodiment can also be modified in the same way.

- In the first embodiment, in the state of the blank sheet 2, the side wall 12 located between the end walls 11 and 13 is a cuttable surface. However, this is not limited to this, and for example, the side wall 14 may be a cuttable surface, and the edge between the side wall 14 and the end walls 11 and 13 may be provided with a first cutting assist line 16 when the packaging box 1 is assembled. In this case, the outer flap 34 is a cuttable flap, and the outer flap 34 has a hand hole portion 35 and a pair of second cutting assist lines 36. Also, both of the side walls 12 and 14 may be cuttable surfaces, and both of the outer flaps 32 and 34 may be cuttable flaps. Note that in the second embodiment, similarly, the second wall 54 may be a cuttable surface, and the outer flap 74 may be a cuttable flap. Also, both of the second walls 52 and 54 may be cuttable surfaces, and both of the outer flaps 72 and 74 may be cuttable flaps.

- In the first embodiment, a configuration in which the cutouts 31a, 33a are provided in the inner flaps 31, 33 is exemplified. However, this is not limited to this, and for example, in cases where the size of the blocking portion 35d is smaller than the distance between the tips of the inner flaps 31, 33, the cutouts 31a, 33a do not need to be provided in the inner flaps 31, 33. Note that similar modifications are also possible for the cutouts 71a, 73a in the second embodiment.

- In the first embodiment, the cutouts 31a, 33a are illustrated as having an arc-shaped portion and a straight portion. However, the shape of the cutouts 31a, 33a is not particularly limited as long as the blocking portion 35d does not interfere with the inner flaps 31, 33 when forming the hand hole 37 in the outer flap 32. Note that similar modifications are also possible for the cutouts 71a, 73a in the second embodiment.

- In the first embodiment, a configuration in which the pair of second cutting assist lines 36 have a straight line shape extending from the hand hole portion 35 toward each of the first cutting assist lines 16 is exemplified. However, this is not limited to this, and the pair of second cutting assist lines 36 can have any shape. For example, the pair of second cutting assist lines 36 may be an arc shape that bulges from the hand hole portion 35 toward each of the first cutting assist lines 16 so as to approach the side edge of the outer flap 32, or may be an arc shape that bulges so as to approach the upper line 19b. Note that the pair of second cutting assist lines 76 in the second embodiment can also be modified in a similar manner.

- In the first embodiment, a configuration in which the bottom inner flaps 21, 23 are connected to the lower edges of the end walls 11, 13, and the bottom outer flaps 22, 24 are connected to the lower edges of the side walls 12, 14 is exemplified. However, this is not limited to this, and for example, as long as the dimensions of the end walls 11, 13 and the side walls 12, 14 are the same in the circumferential direction of the body 10, the bottom outer flaps may be provided on the lower edges of the end walls 11, 13, and the bottom inner flaps may be provided on the lower edges of the side walls 12, 14. Note that in the second embodiment, the bottom outer flaps may be provided on the lower edges of the first walls 51, 53, and the bottom inner flaps may be provided on the lower edges of the second walls 52, 54.

- In the first embodiment, a configuration in which the seam 15 is connected to the side wall 14 via the body crease 17 is exemplified, but this is not limited thereto, and for example, the seam 15 may be connected to the end wall 11. In this case, the boundary between the end wall 11 and the seam 15 has a configuration similar to the body crease 17. Note that the seam 56 in the second embodiment can also be modified in a similar manner.

- The material of the packaging boxes 1, 41 is not limited to cardboard and may be, for example, thick paper.

Reference Signs List 1, 41: Packaging box 2, 42: Blank sheet 10, 50: Body 10a: Opening 11, 13: End wall 12, 14: Side wall 16, 57a: First cutting assist line 20, 60: Bottom surface 30, 70: Top surface 31, 33, 71, 73: Inner flap 31a, 33a, 71a, 73a: Cutout portion 32, 34, 72, 74: Outer flap 32a, 72a: Opening portion 32b, 72b: Remaining portion 35, 75: Hand hole portion 35a, 75a: Ruled line 35b, 75b: Cutout 35c, 75c: Third cutting assist line 35d, 75d: Closure portion 36, 76: Second cutting assist line 37: Hand hole 51, 53: First wall 52, 54...Second wall 55...Third wall

Claims (4)

A packaging box including a body portion having a pair of first side surfaces and a pair of second side surfaces, a pair of inner flaps connected to upper edges of each of the first side surfaces, and a pair of outer flaps connected to upper edges of each of the second side surfaces,
At least one of the pair of second side surfaces is a cuttable surface;
Among the pair of outer flaps, the outer flap connected to the cuttable surface is a cuttable flap,
the body portion includes a pair of first cutting assist lines at edges between the cuttable surface and each surface connected to both side edges of the cuttable surface;
The cuttable flap includes a hand hole portion that is a hand hole penetrating the cuttable flap, and a pair of second cutting assist lines that connect the hand hole portion and ends of each of the first cutting assist lines,
The hand hole portion is a line connecting the ends of the pair of second cutting assist lines,
A pair of notches extending from both ends of the crease;
A third cutting assist line connecting the pair of cuts;
a closing portion defined by the ruled line, the pair of cuts, and the third cutting assist line;
The ruled line is provided at a position closer to the upper edge of the cuttable surface than the third cutting assist line ,
The pair of second cutting assist lines linearly connect the hand hole and the end of each of the first cutting assist lines.
A packaging box characterized by: The packaging box according to claim 1 , wherein the pair of inner flaps have a notch portion located below the hand hole. The packaging box is formed by assembling blank sheets,
In the blank sheet,
the first side surface and the second side surface are arranged alternately,
The packaging box according to claim 1 or 2, wherein the cuttable surface is one of the pair of second side surfaces that is located between the pair of first side surfaces. a bottom flap connected to a lower edge of the cuttable surface;
The packaging box according to any one of claims 1 to 3, further comprising a fourth tear assist line connecting the pair of first tear assist lines at an edge between the tearable surface and the bottom flap.