Packaging box

Abstract

To provide a packaging box which is easy to open.SOLUTION: In the packaging box 10 having a body part 10, a cover flap 5, and a bottom flap 6, the body part 10 is formed by connecting a front 2L 3, a back 2R 4, a side 2L, and a side 2R, and the side 11L and the side 12R are connected to the front wall 3 through first ruled lines wall and wall, and connected to the back wall 4 through second ruled lines wall and wall, respectively. 11R 12L, the front 2L 3 is provided with the first break line 32, the back 2L 4 is provided with the second break line 42, the side 28L 2R and the 2R are provided with the third break line 21 extending in the circumferential direction and connected to the first break line 32 and the second break line 42, and the opening start portion 22 adjacent to a part of the third break line 21 and the opening ruled line 25 extending from the opening start portion 22 toward the corner portion are formed in the upper region wall and the 28R of the side wall wall and the ceiling.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a packaging box formed by folding a sheet material. [Background technology]

[0002] Packaging boxes formed by folding cardboard sheets are known that are configured so that when opened, a portion of the packaging box can be cut off and used as is for displaying products. Such packaging boxes are also called shelf-ready packages and are widely used in retail stores and the like. Generally, such packaging boxes have break lines that run across multiple sides, and are configured so that when the packaging box is broken along the break line when opened, a portion of the box separates (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-31126 Summary of the Invention [Problem to be solved by the invention]

[0004] Packaging boxes are used to protect products and the like contained therein from impacts and the like. For this reason, even if a packaging box has a break line as described above, it needs to have a certain level of strength so that the products and the like contained therein are not affected by external forces. In other words, the packaging box needs to be configured so that when an external force such as an impact is applied, the break line will not break and its strength will not be lost.

[0005] On the other hand, ensuring the strength of the packaging box may make it difficult to open. For example, if the break line is designed to be incapable of being broken by an external force, the break line may be difficult to break when opening the box, making it difficult to open the box.

[0006] The present disclosure relates to a packaging box that is easy to open. [Means for solving the problem]

[0007] To achieve the above object, the present disclosure provides the following means. The packaging box of the present disclosure has a cylindrical main body portion having a rectangular opening, a lid flap that covers at least a portion of the opening on the upper side of the main body portion, and a bottom flap that covers at least a portion of the opening on the lower side of the main body portion, wherein the main body portion is formed into a cylindrical shape by connecting a front wall, a rear wall that is disposed on the side opposite to the front wall, and a pair of side walls that are disposed between the front wall and the rear wall, and the front wall sides of the pair of side walls are connected to the front wall via a pair of first lines that extend in the vertical direction. The pair of side walls are connected to the rear wall on their respective sides via a pair of second lines extending in the vertical direction, the front wall is provided with a first break line dividing the front wall in the vertical direction, the rear wall is provided with a second break line dividing the rear wall in the vertical direction, and each of the side walls is provided with a third break line extending in a circumferential direction that intersects with the vertical direction and connecting to the first break line and the second break line, and in the region above the third break line of each of the side walls, An opening start portion is formed adjacent to a portion of the third break line, and an opening line extends from the upper portion of the opening start portion toward the corner where the first line intersects with the edge of the side wall on the side of the upper opening.

[0008] With the packaging box described above, when a finger is placed in the opening formed in the opening start portion and each side wall is pulled outward, the portion of the side wall above the third break line is mountain-folded at the opening score line and bulges outward. When the upper portion of the side wall bulges outward, a force acts in a direction that breaks the third break line, causing the third break line to break. That is, with the packaging box described above, because the side wall has the opening score line, the side wall is mountain-folded at the opening score line, making it easy to bulge outward. That is, the operation of breaking the third break line is easy to perform, and the operation of opening the packaging box is easy.

[0009] In the above disclosure, it is preferable that the third break line extends to connect between a first intersection where the first break line connects to the first score line and a second intersection where the second break line connects to the second score line, and that the second intersection is located above the first intersection.

[0010] By doing so, the angle between the opening score line and the third break line is greater than a certain value. Therefore, when the side wall is folded along the opening score line and bulges outward, the force component in the direction of breaking the third break line increases. This means that the operation of breaking the third break line becomes easier, making it easier to open the packaging box. Furthermore, after opening, the lower part of the packaging box has a tray-like shape with a higher back side. This means that the lower part of the packaging box after opening can be made into a tray-like shape suitable for displaying products, etc.

[0011] In the above disclosure, it is preferable that each of the side walls has at least one auxiliary crease formed in the region above the third break line, the auxiliary crease extending parallel to the opening crease.

[0012] By doing so, the portion of the side wall above the third break line is mountain-folded at the opening score line and the auxiliary score line, making it easier to bulge the side wall outward. In other words, it becomes easier to bulge the side wall outward and break the third break line, making it easier to open the packaging box.

[0013] In the above disclosure, it is preferable that the opening start portion is formed closer to the front wall than the center of the side wall in the circumferential direction.

[0014] By doing so, the angle between the opening score line and the third break line is greater than a certain value. Therefore, when the side wall is folded along the opening score line and bulges outward, the force component in the direction of breaking the third break line increases. In other words, it becomes easier to break the third break line, and the packaging box becomes easier to open.

[0015] In the above disclosure, the first break line defines a protrusion on the front wall that extends upward as it moves toward the center in the circumferential direction, and it is preferable that the first break line has a pair of fourth break lines whose circumferential width narrows as it moves upward.

[0016] By doing so, when an outward force is applied to the opening start portion, a force acts on the front wall in a direction that causes a valley fold along the pair of fourth break lines, making it easier to break the fourth break lines. In other words, it becomes easier to break the fourth break lines and thereby break the entire first break lines, making it easier to open the packaging box. [Effects of the Invention]

[0017] According to the present disclosure, a packaging box that is easy to open can be provided. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a perspective view showing an example of a packaging box according to the present disclosure. [Figure 2] FIG. 1 is a development view of a packaging box according to the present disclosure. [Figure 3] FIG. 1 is a side view showing an example of a packaging box according to the present disclosure. [Figure 4] 10A to 10C are diagrams illustrating an example of a method for opening the packaging box of the present disclosure. [Figure 5] 10A to 10C are diagrams illustrating an example of a method for opening the packaging box of the present disclosure. [Figure 6] FIG. 10 is a diagram illustrating an example of a state in which the packaging box of the present disclosure has been opened. [Figure 7] 1 is a diagram illustrating an example of a state in which a portion of the front wall of a packaging box according to the present disclosure has been cut away. [Figure 8] 10A and 10B are diagrams illustrating modified examples of the packaging box of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0019] A packaging box 1 according to one embodiment of the present disclosure will be described mainly with reference to FIGS. 1 to 7. In the following description, the front-rear, left-right, and top-bottom directions will refer to the directions shown in the drawings unless otherwise specified. The side of the packaging box on which the product is stored will also be referred to as the inside, and the opposite side as the outside. Furthermore, the surface of the packaging box 1 facing inward will also be referred to as the back or rear side, and the surface of the packaging box 1 facing outward will also be referred to as the front or front side.

[0020] 1. Overall Description The packaging box 1 of this embodiment is a cardboard box used to package multiple products. Examples of products packaged in the packaging box 1 include individually packaged foods such as retort pouch foods. The packaging box 1 is configured so that the products can be displayed as is after opening. Note that the products packaged in the packaging box 1 and the uses of the packaging box 1 are merely examples and are not limited to those disclosed in this embodiment.

[0021] The packaging box 1 is a rectangular parallelepiped cardboard box assembled by folding cardboard sheets formed into a predetermined shape at predetermined locations. As shown in Figures 1 and 2, the packaging box 1 comprises a main body 10, a lid flap 5, and a bottom flap 6.

[0022] The main body 10 is composed of a front wall 3, a rear wall 4, and side walls 2L and 2R. The front wall 3 is the front surface of the packaging box 1 shown in Fig. 1, and the rear wall 4 is the rear surface of the packaging box 1 that faces the front wall 3 (the rear wall 4 is not shown in Fig. 1). The side walls 2L and 2R are a pair of side surfaces located between the front wall 3 and the rear wall 4, and are located on the left and right sides of the front wall 3 in Fig. 1.

[0023] The side wall 2R is connected to the front wall 3 via a crease 11R. The side wall 2R is connected to the back wall 4 via a crease 12R. The side wall 2L is connected to the front wall 3 via a crease 11L. The side wall 2L is connected to the back wall 4 via a crease 12L (see Figures 1 and 2). In Figure 1, the side wall 2L and the crease 12L are not shown. The crease 11L and 11R are an example of a first crease, and the crease 12L and 12R are an example of a second crease.

[0024] The lid flap 5 is a flap that covers at least a portion of the upper opening 50, which is an opening on the upper side of the main body 10. The upper opening 50 is a portion surrounded by the upper sides 13, 15R, 14, and 15L, which are the upper sides of the main body 10. The lid flap 5 is composed of outer flaps 51L and 51R and inner flaps 52 and 53. In FIG. 1, the entire upper opening 50 is shown covered by the lid flap 5, and the upper opening 50 and the inner flaps 52 and 53 are not shown. The lid flap 5 may be configured to cover only a portion of the upper opening 50. For example, the lid flap 5 may be configured such that a gap is formed between the outer flaps 51L and 51R when the lid flap 5 covers the upper opening 50.

[0025] The bottom flap 6 is a flap that closes at least a portion of a lower opening 60, which is an opening on the lower side of the main body 10. The lower opening 60 is a portion surrounded by lower sides 16, 18R, 17, and 18L, which are the lower sides of the main body 10. In FIG. 1, the lower sides 17 and 18L, the lower opening 60, and the bottom flap 6 are not shown. The bottom flap 6 is a one-touch flap composed of first flaps 61L and 61R and second flaps 62 and 63, each having the shape shown in FIG. 2. The bottom flap 6 may be composed of a pair of outer flaps and a pair of inner flaps, similar to the lid flap 5.

[0026] 2.Explanation of the development diagram The packaging box 1 is formed by folding a sheet material A processed into the shape shown in Fig. 2 along ruled lines formed in predetermined locations. The sheet material A is formed so that the paper width direction (the direction of the core) faces the up-down direction in Fig. 2. Hereinafter, the sheet material A will be described mainly with reference to Fig. 2. The sheet material A may be any other known sheet material, such as cardboard, processed into a predetermined shape.

[0027] In the sheet material A, side walls 2L and 2R are connected to both sides of the front wall 3. A crease 11L is formed at the boundary between the front wall 3 and the side wall 2L, and a crease 11R is formed at the boundary between the front wall 3 and the side wall 2R.

[0028] The rear wall 4 is connected to the side wall 2R on the side opposite to the side where the front wall 3 is connected. A crease 12R is formed at the boundary between the side wall 2R and the rear wall 4. A substantially trapezoidal glue tab 7 is connected to the side wall 2L on the side opposite to the side where the front wall 3 is connected. A crease 12L is formed at the boundary between the side wall 2L and the glue tab 7. Hereinafter, the direction in which the glue tab 7, side wall 2L, front wall 3, side wall 2R, and rear wall 4 are arranged will also be referred to as the circumferential direction or the arrangement direction.

[0029] In Fig. 2, the strip-shaped portion where the overlap portion 7, side wall 2L, front wall 3, side wall 2R, and rear wall 4 are lined up constitutes the cylindrical main body 10. More specifically, when assembling the packaging box 1, this strip-shaped portion is folded to the same side at the creases 11L, 11R and the creases 12L, 12R. Then, the edge 8 of the rear wall 4 is aligned with the crease 12L, and the circumferential end portion of the rear wall 4 is placed on the front side of the overlap portion 7. The overlap portion 7 is fixed to the rear surface of the rear wall 4 by a known fixing method such as an adhesive, and the cylindrical main body 10 is formed.

[0030] An outer flap 51L extends from the upper edge 15L of the side wall 2L. A first flap 61L extends from the lower edge 18L of the side wall 2L. Similarly, an outer flap 51R extends from the upper edge 15R of the side wall 2R, and a first flap 61R extends from the lower edge 18R.

[0031] An inner flap 52 extends from the upper side 13 of the front wall 3. A second flap 62 extends from the lower side 16 of the front wall 3. Similarly, an inner flap 53 extends from the upper side 14 of the rear wall 4, and a second flap 63 extends from the lower side 17.

[0032] Ruled lines are formed on the upper edges 15L, 13, 15R, 14 and the lower edges 18L, 16, 18R, 17. That is, ruled lines are formed at the boundary between the front wall 3 and the inner flap 52, the boundary between the rear wall 4 and the inner flap 53, the boundary between the front wall 3 and the second flap 62, and the boundary between the rear wall 4 and the second flap 63. Ruled lines are also formed at the boundary between the side walls 2L, 2R and the outer flaps 51L, 51R, and the boundary between the side walls 2L, 2R and the first flaps 61L, 61R.

[0033] The inner flaps 52, 53 are folded along the lines formed on the upper sides 13, 14, respectively, to cover at least a portion of the upper opening 50. The outer flaps 51L, 51R are folded along the lines formed on the upper sides 15L, 15R, to cover at least a portion of the upper opening 50 so as to overlap the surfaces of the inner flaps 52, 53 that were previously folded.

[0034] The first flaps 61L, 61R and the second flaps 62, 63 are parts that make up the one-touch bottom flap 6. A pentagonal adhesive portion 64L extending from the first flap 61L toward the second flap 62 is fixed by gluing or the like to a corresponding location on the adjacent side of the second flap 62. A pentagonal adhesive portion 64R extending from the first flap 61R toward the second flap 63 is fixed by gluing or the like to a corresponding location on the adjacent side of the second flap 63.

[0035] 3. Explanation of each side Next, each surface of the packaging box 1 will be described mainly with reference to Figures 1 and 2. Note that the side wall 2L and the side wall 2R are identical except that the positions of the break lines and the like are symmetrical, so the description will mainly focus on the side wall 2R, and a detailed description of the side wall 2L will be omitted.

[0036] The front wall 3 has a break line 32 formed thereon, which extends parallel to the upper edge 13 and the lower edge 16, connecting the crease 11L and the crease 11R. In other words, the front wall 3 has a break line 32 formed thereon, which extends in the circumferential direction (the direction in which the edges are aligned) between the crease 11L and the crease 11R. The break line 32 is formed by repeatedly providing cuts of a predetermined length at predetermined intervals. The break line 32 may also be formed by any other known method.

[0037] One end of the broken line 32 is connected to the ruled line 11L at an intersection XL. The other end of the broken line 32 is connected to the ruled line 11R at an intersection XR. The intersections XL and XR are examples of first intersections.

[0038] Here, the state in which a break line is connected to a ruled line refers to a state in which, of the incisions forming the break line, one incision closest to the ruled line is formed across the ruled line, or an end of the incision reaches the ruled line. The state in which a break line is connected to a ruled line also includes a state in which there is a distance between the incision closest to the ruled line and the ruled line that is large enough to break the break line without any problems.

[0039] Fracture lines 33 are formed in the center of the front wall 3 so as to surround a substantially rectangular area. The fracture lines 33 have a set of fracture lines 33a extending parallel to the up-down direction and a set of fracture lines 33b extending parallel to the circumferential direction. Each set of fracture lines 33a is formed so as to cross over the fracture lines 32. Furthermore, the set of fracture lines 33a and the set of fracture lines 33b are connected in an arc shape at the corners of the substantially rectangular area surrounded by the fracture lines 33.

[0040] In the region surrounded by the break line 33, above the break line 32, a pair of break lines 31L, 31R are formed, the distance between which narrows as they go upward. These break lines 31L, 31R are symmetrical about an axis extending in the vertical direction. Hereinafter, the break lines 31L, 31R will be collectively referred to as break lines 31. The break line 31 is formed by repeatedly providing cuts of a predetermined length at predetermined intervals. The break lines 31L, 31R may also be break lines formed by other known methods.

[0041] Fracture line 31L is formed in an arc shape, curving downward from point pl on fracture line 33a on the side of ruled line 11L, a predetermined distance from fracture line 32, toward fracture line 33b. Fracture line 31R is similarly formed in an arc shape, curving downward from point pr on fracture line 33a on the side of ruled line 11R, a predetermined distance from fracture line 32, toward fracture line 33b above. Fracture lines 31L and 31R are formed so that a certain gap is provided between point ql where fracture line 31L connects to fracture line 33b above and point qr where fracture line 31R connects to fracture line 33b above. Hereinafter, the portion of fracture line 33b between points ql and qr will also be referred to as fracture line 33c.

[0042] Here, a state in which one break line is connected to another break line means a state in which one of the notches forming one break line is connected to one of the notches forming the other break line. Also, a state in which there is a gap between one of the notches forming one break line and one of the notches forming the other break line that is large enough to not interfere with breaking is also included in the state in which one break line is connected to another break line.

[0043] The mountain-shaped portion surrounded by fracture line 32, fracture lines 31L and 31R, fracture line 33c, the portion of fracture line 33a between point pl and fracture line 32, and the portion of fracture line 33a between point pr and fracture line 32 is protrusion 36. In other words, fracture lines 31L and 31R are formed so that mountain-shaped protrusion 36 is formed in the portion above fracture line 32 in the region surrounded by fracture line 33.

[0044] On the part of the front wall 3 on the side of the crease 11L, a circular arc-shaped cut 35L is formed from point pl toward the crease 11L. The tip of cut 35L is connected to the break line 32 at a position between the break line 33a and the crease 11L. Similarly, on the part of the front wall 3 on the side of the crease 11R, a circular arc-shaped cut 35R is formed from point pr toward the crease 11R.

[0045] Because the cuts 35L and 35R are arc-shaped cuts with a relatively large radius, for example, when the fracture line 32 breaks from the intersection XL toward the fracture line 33a and the broken portion connects to the lower end of the cut 35L, the cut 35L is separated. Then, the fracture line 31L breaks upward from the side of the point pl. Also, for example, when the fracture line 32 breaks from the intersection XR toward the fracture line 33a and the broken portion connects to the lower end of the cut 35R, the cut 35R is separated. Then, the fracture line 31R breaks upward from the side of the point pr. That is, the cuts 35L and 35R guide the direction in which the front wall 3 is broken. In other words, when the front wall 3 is broken along the breaking line 32 from the side of the intersections XL and XR, the breaking direction is guided by the cuts 35L and 35R, and the breaking lines 31L and 31R are broken.

[0046] If the break line 33c is further broken after the break lines 31L and 31R are broken, the front wall 3 is divided into upper and lower parts. Hereinafter, the break lines aligned in the breaking direction induced by the cuts 35L and 35R will also be referred to as break lines 30. That is, the break line 32 between the intersection XL and the cut 35L, the cut 35L, the break line 31L, the break line 33c, the break line 31R, the cut 35R, and the break line 32 between the cut 35R and the intersection XR will also be referred to as break lines 30. The break line 30 is an example of a first break line. The break lines 31L and 31R are also an example of a fourth break line.

[0047] The rear wall 4 has a break line 42 formed thereon, which extends parallel to the upper edge 14 and the lower edge 17 and connects the crease 12L with the crease 12R. In other words, the rear wall 4 has a break line 42 formed thereon, which extends in the circumferential direction (the direction in which the edges are aligned) between the crease 12L and the crease 12R. The break line 42 divides the rear wall 4 into upper and lower parts. The break line 42 is formed by providing approximately L-shaped cuts at predetermined intervals. The break line 42 may also be formed by another known method.

[0048] One end of the break line 42 is connected to the ruled line 12L at an intersection YL. The other end of the break line 42 is connected to the ruled line 12R at an intersection YR. The break line 42 is an example of a second break line. Furthermore, the intersections YL and YR are an example of a second intersection portion.

[0049] 2, the break line 42 is formed at a position higher than the position at which the break line 32 is formed on the front wall 3. In other words, the intersection points YL and YR of the break line 42 are formed higher than the intersection points XL and XR.

[0050] A vertically extending crease 44 is formed near the circumferential center of the region above the fracture line 42 on the rear wall 4. Circular fracture lines 41L and 41R are formed on both sides of this crease 44. Each of the circular fracture lines 41L and 41R is a semicircular fracture line, and each end is connected to the fracture line 42. The portions surrounded by the circular fracture lines 41L and 41R and the fracture line 42 are the cut-out pieces 45L and 45R.

[0051] Furthermore, in an area above the break line 42 on the rear wall 4, a crease 43L is formed between the circular break line 41L and the side 8, extending obliquely toward the corner where the side 8 intersects with the upper side 14. Furthermore, in an area above the break line 42 on the rear wall 4, a crease 43R is formed between the circular break line 41R and the crease 12R, extending obliquely toward the corner where the crease 12R intersects with the upper side 14.

[0052] A fracture line 21 is formed on the side wall 2R, extending obliquely in the circumferential direction to connect the creased line 11R and the creased line 12R. The fracture line 21 intersects with the creased line 11R at an intersection XR and is connected to the fracture line 32. The fracture line 21 also intersects with the creased line 12R at an intersection YR and is connected to the fracture line 42. As described above, the intersection YR is formed above the intersection XR, and therefore the fracture line 21 extends obliquely upward from the intersection XR.

[0053] The fracture line 21 is formed by providing approximately L-shaped cuts at a predetermined interval. The portion of the fracture line 21 sandwiched between the demarcation lines 23 (described in detail below), i.e., the portion between the approximately L-shaped cut 23a and the arc-shaped cut 23c, is formed by providing linear cuts at a predetermined interval. Hereinafter, the portion of the fracture line 21 between the cut 23a and the arc-shaped cut 23c will also be referred to as the fracture line 21a. The fracture line 21 may be formed by another known method. The fracture line 21 is an example of a third fracture line. Hereinafter, the region above the fracture line 21 in the side wall 2R will also be referred to as the upper region 28R, and the region above the fracture line 21 in the side wall 2L will also be referred to as the upper region 28L.

[0054] An opening start portion 22 is formed in the upper region 28R. The opening start portion 22 is formed adjacent to the break line 21a, which is part of the break line 21, at a location closer to the line 11R, i.e., the front wall 3, than the circumferential center of the side wall 2R.

[0055] The opening start portion 22 is a portion that is pushed inward when opening the packaging box 1, thereby forming an opening into which the fingers of the worker performing the opening operation are inserted. As shown in Figures 1 and 2, the opening start portion 22 has a generally trapezoidal shape surrounded by a generally U-shaped partition line 23 and a rupture line 21a. The shape of the opening start portion 22 is an example, and other shapes may be used as long as an opening suitable for the opening operation into which the fingers of the worker are inserted can be formed.

[0056] The compartment line 23 is composed of a substantially L-shaped cut 23a, a straight fold line 23b, and an arc-shaped cut 23c. The fold line 23b is a crease connecting the cuts 23a and 23c. The end of the fold line 23b on the crease 11R side is connected to the upper end of the cut 23c, and the end of the fold line 23b on the crease 12R side is connected to the upper end of the cut 23a. The lower end of the cut 23c is connected to the break line 21, and the lower end of the cut 23a is connected to the break line 21 closer to the crease 12R than the point where the cut 23c and the break line 21 connect.

[0057] In the upper region 28R, a opening crease 25 is formed, extending linearly from a location above the opening start portion 22 toward the corner where the crease 11R and the upper side edge 15R intersect. More specifically, the straight opening crease 25 is formed, extending obliquely from a location 27 on the side of the notch 23c of the fold line 23b toward the corner where the crease 11R and the upper side edge 15R intersect. In other words, the opening crease 25 is formed from the corner where the crease 11R and the upper side edge 15R intersect toward the opening start portion 22, and the location where the opening crease 25 and the partition line 23 intersect is the location 27.

[0058] The opening score 25 is formed at a position that approximately bisects the angle formed by the score 11R and the upper side edge 15R. That is, the opening score 25 is formed at a position where the angle formed by the score 11R and the opening score 25 is the same as the angle formed by the upper side edge 15R and the opening score 25. The above position where the opening score 25 is formed is an example, and the opening score 25 may be formed so that the angle formed by the score 11R and the opening score 25 is different from the angle formed by the upper side edge 15R and the opening score 25.

[0059] Furthermore, in the upper region 28R, an auxiliary crease 26 is formed above the opening crease 25, extending parallel to the opening crease 25. The auxiliary crease 26 is formed obliquely upward from near the intersection of the fold line 23b and the cut 23a, parallel to the opening crease 25. In other words, the auxiliary crease 26 is formed obliquely upward from the portion of the opening start portion 22 on the side of the crease 12R, parallel to the opening crease 25.

[0060] In opening start portion 22, fold line 24 is formed, extending downward from the vicinity of point 27 toward break line 21. Fold line 24 is a crease extending from a point on break line 21a closer to incision 23c to the vicinity of point 27.

[0061] Similarly, a break line 21 is provided on the side wall 2L. That is, the break line 21 is formed so as to extend obliquely in the circumferential direction so as to connect the crease 11L and the crease 12L. The break line 21 formed on the side wall 2L intersects with the crease 11L at an intersection XL and is connected to the break line 32. The break line 21 formed on the side wall 2L intersects with the crease 12L at an intersection YL and is connected to the break line 42. The break line 21 is formed so as to extend obliquely upward from the intersection XL. Note that a break line 7a is formed in the glue margin 7 at a position corresponding to the break line 42, and the break line 21 is connected to the break line 7a at the intersection YL. The break line 7a divides the glue margin 7 into upper and lower parts and is broken together with the break line 42 when the package is opened. Furthermore, in the upper region 28L, an opening start portion 22, an opening line 25, and an auxiliary line 26 are formed, similarly to the upper region 28R.

[0062] The opening crease 25 formed in the upper region 28L extends obliquely in a straight line from the opening start portion 22 at a location 27 on the side wall 2L toward the corner where the crease 11L and the upper edge 15L intersect. The auxiliary crease 26 is formed parallel to the opening crease 25 at a position above the opening crease 25 formed in the upper region 28L.

[0063] 4. Opening instructions Next, a method for opening the packaging box 1 will be described mainly with reference to FIGS. First, an operator applies inward force by placing a finger on each opening start portion 22 of side walls 2L, 2R. When an inward force is applied to opening start portion 22, breaking line 21a breaks, and opening start portion 22 is folded inward along fold line 23b, forming an opening into which the operator can insert their finger (see FIG. 3).

[0064] The opening starting portion 22 is provided with a fold line 24. Therefore, when an inward force is first applied to the portion of the opening starting portion 22 closest to the notch 23c, the portion of the opening starting portion 22 on the front wall 3 side that is surrounded by the notch 23c and the fold line 24 is folded inward at the fold line 24, forming a small opening. Then, when a further inward force is applied to the portion of the opening starting portion 22 facing the small opening, the break line 21a breaks from the side of the formed small opening. This makes it easier to break the break line 21a and to push the opening starting portion 22 inward to form an opening into which the operator's fingers can be inserted.

[0065] Once the opening start portion 22 is pushed inward to form an opening, insert a finger into each opening in the side walls 2L, 2R and apply force to pull the upper regions 28L, 28R outward. That is, apply force in the outward direction (indicated by the arrow in FIG. 4 ) from the back side of the upper regions 28L, 28R near the opening start portion 22. Specifically, insert the operator's index finger or middle finger into the opening, bring the fingertips into contact with the back surface of the upper regions 28L, 28R, and apply outward force. At this time, it is easier to apply force if the operator places their thumb on the upper edges 15L, 15R of the lid flap 5 or on the corner where the upper edge 13 intersects with the upper edges 15L, 15R.

[0066] When force is applied outward, the upper regions 28L, 28R are mountain-folded at the opening crease 25 and auxiliary crease 26, resulting in an outward bulge. As the upper regions 28L, 28R bulge outward, the break lines 21 break from the opening start portion 22 toward the front wall 3 and the rear wall 4, respectively. When the break lines 21 break completely, the side walls 2L, 2R are each divided into upper and lower halves. When further force is applied outward to the upper regions 28L, 28R, the portions of the break lines 32 on the crease lines 11L, 11R break and connect to the notches 35. Then, the break lines 31L, 31R break upward from the points pl, pr, respectively, resulting in a connection between the break lines 31L, 31R and the break line 21 (see FIG. 4).

[0067] Alternatively, when a force is applied to the upper regions 28L, 28R in an outward direction, the force is transmitted to the front wall 3, causing the front wall 3 to be valley-folded at the break lines 31L, 31R. Then, the break lines 31L, 31R break, and the break line 32 between the incision 35 and the intersections XL, XR breaks, so that the break lines 31L, 31R and the break line 21 are connected via the incision 35 (see FIG. 4).

[0068] Once the break lines 31L and 31R are connected to the break line 21, the break line 32c is further broken. In this way, the front wall 3 is divided into upper and lower parts at the break line 30 (see FIG. 5). At this time, as shown in FIG. 5, the protrusion 36 protrudes upward from the area of ​​the front wall 3 below the break line 32.

[0069] Once the side walls 2L, 2R and the front wall 3 are each divided into upper and lower halves, the break line 42 is broken to divide the rear wall 4 into upper and lower halves. Specifically, an inward force is applied to the cut pieces 45L, 45R to break the circular break lines 41L, 41R, forming a semicircular opening. Then, a finger is inserted into the semicircular opening, and an outward force is applied to the area of ​​the rear wall 4 above the break line 42.

[0070] When an outward force is applied to the region above break line 42 of rear wall 4, the portion between cut piece 45L and cut piece 45R of break line 42 breaks, and the region above break line 42 of rear wall 4 is mountain-folded at creases 43L, 43R and crease 44. Then, the portion between cut piece 45L of break line 42 and crease 12L breaks from the side of cut piece 45L toward crease 12L. Also, the portion between cut piece 45R and crease 12R breaks from the side of cut piece 45R toward crease 12R.

[0071] When the break line 42 is completely broken, the rear wall 4 is divided into upper and lower halves. Alternatively, the rear wall 4 may be divided into upper and lower halves by breaking the break line 42 from the side of the crease 12R toward the side of the crease 12L, or from the side of the crease 12L toward the side of the crease 12R, without breaking the circular break lines 41L and 41R.

[0072] When the rear wall 4 is divided into upper and lower halves, the packaging box 1 is completely divided into upper and lower halves (see Figure 6). When the break line 33 formed below the break line 32 of the front wall 3 is completely broken, the area of ​​the front wall 3 surrounded by the break line 33 is removed together with the protrusion 36, and the lower part of the packaging box 1 is recessed toward the center of the front (see Figure 6). In other words, the lower part of the packaging box 1 becomes tray-shaped, suitable for displaying products.

[0073] Before opening, i.e., before breaking the break line 21, the packaging box 1 can be used to display products by breaking the break line 33 in the front wall 3 to open a substantially rectangular opening window (see FIG. 7). With the packaging box 1 in this state, it is suitable for displaying products when stacked. Specifically, the packaging box 1 placed on the top tier is in a tray-like state with its upper portion removed, and the packaging boxes 1 placed on the second tier and below are broken along the break line 33 to open the opening window. In this way, products can be displayed while allowing the contents of the packaging boxes 1 on the second tier and below to be confirmed from the outside.

[0074] Alternatively, the packaging box 1 may be used for displaying merchandise by removing the break line 33 and the fan-shaped portions 34L and 34R surrounded by the break lines 31L and 31R. In this way, merchandise can be displayed while maintaining durability in the vertical direction and allowing some of the contents of the packaging box 1 to be confirmed from the outside.

[0075] 5. Explanation of effects In the packaging box 1 according to the present disclosure, opening lines 25 are formed from the upper portions of the opening start portion 22 of the side walls 2L, 2R toward the upper corners of the front wall 3. In other words, the opening lines 25 are formed from the upper portions of the opening start portion 22 of the upper region 28L toward the corners where the line 11L and the upper side edge 15L intersect. In addition, the opening lines 25 are formed from the upper portions of the opening start portion 22 of the upper region 28R toward the corners where the line 11R and the upper side edge 15R intersect.

[0076] Because the packaging box 1 has such opening creases 25, when an outward force is applied to the portions of the upper regions 28L, 28R near the opening start portion 22, the upper regions 28L, 28R are mountain-folded at the opening crease 25 and bulge outward. When the upper regions 28L, 28R bulge outward in this manner, a force in a direction that tears the break line 21 acts on the side of the opening start portion 22 of the break line 21, making it easier to break the break line 21. In other words, because the opening start portion 22 is formed on the side walls 2L, 2R, the opening operation of breaking the break line 21 becomes easier.

[0077] Furthermore, the break lines 21 are formed obliquely so that the intersections YL and YR where the break lines 21 intersect with the ruled lines 12L and 12R are higher than the intersections XL and XR where the break lines 21 intersect with the ruled lines 11L and 11R. That is, the break lines 21 are formed obliquely so that their positions become higher as they move from the front wall 3 side toward the rear wall 4 side. In other words, the break lines 21 are formed obliquely so that the angle they form with the opening ruled line 25 is equal to or greater than a certain value. When the break lines 21 are formed in this manner, the angle between the opening ruled line 25 and the break lines 21 is equal to or greater than a certain value.

[0078] With the break line 21 thus formed, when an outward force is applied to the portion of the upper region 28L, 28R near the opening start portion 22, a larger force component acts in a direction tearing the break line 21 from the opening start portion 22 side of the break line 21. That is, when an outward force is applied to the upper region 28L, 28R, a larger force component acts along the break line 21 from the opening start portion 22 toward the front wall 3 and a larger force component acts along the break line 21 from the opening start portion 22 toward the rear wall 4. That is, the break line 21 is easier to break, making the opening process easier. Furthermore, by forming the break line 21 obliquely in this manner, when the packaging box 1 is divided into upper and lower halves, the lower portion of the divided packaging box 1 can be formed into a tray-like shape in which the rear side is higher than the front side (see FIG. 6). That is, the lower portion of the packaging box 1 after opening can be shaped to be suitable for displaying products.

[0079] Furthermore, auxiliary creases 26 extending parallel to the opening crease 25 are formed on the side walls 2L, 2R. Therefore, when an outward force is applied to the upper regions 28L, 28R near the opening start portion 22, the upper regions 28L, 28R are mountain-folded at the opening crease 25 and the auxiliary crease 26. In this case, the upper regions 28L, 28R are more likely to bulge outward than when the auxiliary crease 26 is not provided. In other words, the auxiliary crease 26 makes it easier to break the tear line 21, facilitating the opening operation.

[0080] Furthermore, the opening start portion 22 is formed closer to the front wall 3 than the circumferential center of the side walls 2L, 2R. By forming the opening start portion 22 in this manner, the angle formed by the opening crease 25 extending from the upper part of the opening start portion 22 and the break line 21 becomes equal to or larger than a certain value. In other words, by arranging the opening start portion 22 in this position and forming the opening crease 25 so that it extends from a part closer to the front wall 3 than the circumferential center of the side walls 2L, 2R toward the corner, the angle formed by the opening crease 25 and the break line 21 becomes equal to or larger than a certain value.

[0081] With the above configuration, when an outward force is applied to the portion of the upper regions 28L, 28R near the opening initiation portion 22, the force component acting in the direction tearing the break line 21 from the opening initiation portion 22 side of the break line 21 increases. In other words, when an outward force is applied to the upper regions 28L, 28R, the force component acting along the break line 21 from the opening initiation portion 22 toward the front wall 3 and the force component acting along the break line 21 from the opening initiation portion 22 toward the rear wall 4 increase. This makes it easier to break the break line 21, facilitating the opening operation. Furthermore, the force applied to the upper regions 28L, 28R during opening is more easily transmitted to the front wall 3, making it easier to break the break lines 31L, 31R formed on the front wall 3 and other break lines. This makes the opening operation easier.

[0082] Furthermore, the front wall 3 is formed with break lines 31L, 31R whose circumferential width narrows toward the top. Because these break lines 31L, 31R are formed, when an outward force is applied to the portions of the upper regions 28L, 28R near the opening start portion 22, and this force acts on the front wall 3, the front wall 3 is more likely to bend in a valley-like shape around the break lines 31L, 31R. When the front wall 3 is bent in a valley-like shape, a force acts in the breaking direction of the break lines 31L, 31R, making the break lines 31L, 31R more likely to break. Furthermore, when the front wall 3 is bent in a valley-like shape around the break lines 31L, 31R, the side walls 2L, 2R also deform accordingly, and a force acts in the direction that breaks the break lines 21, making the break lines 21 more likely to break. That is, by forming the breaking lines 31L, 31R, the breaking lines 31L, 31R and the breaking line 21 can be easily broken, and the opening operation can be easily performed.

[0083] <Description of Modifications> The packaging box 1 is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present disclosure. For example, as illustrated in Fig. 8, a second auxiliary crease 29 extending parallel to the opening crease 25 may be formed in the portion of the upper regions 28L, 28R below the opening crease 25. Alternatively, the opening crease 25 and the second auxiliary crease 29 may be formed without forming the auxiliary crease 26. Alternatively, three or more auxiliary creases parallel to the opening crease 25 may be formed in the upper regions 28L, 28R.

[0084] In the above embodiment, the opening score 25 is formed at a position closer to the front wall 3 than the circumferential center of the side walls 2L, 2R, but the position at which the opening score 25 is formed is not limited to the above embodiment. For example, the opening score 25 may be formed at the circumferential center of the side walls 2L, 2R. Alternatively, the opening score 25 may be formed at a position closer to the rear wall 4 than the circumferential center of the side walls 2L, 2R.

[0085] In the above embodiment, the front wall 3 is divided into upper and lower parts by breaking it along the break line 30. Alternatively, the front wall 3 may be divided into upper and lower parts by breaking the break line 32 from the intersection XL toward the intersection XR or from the intersection XR toward the intersection XL. The break line 32 in this case is an example of a first break line. Alternatively, the front wall 3 may be divided into upper and lower parts by breaking the break line 32 from the intersection XL to the break line 33a closer to the intersection XL and from the intersection XR to the break line 33a closer to the intersection XR, and then breaking the break line 33 below the break line 32. In this case, the break line 32 between the intersection XL and the break line 33a, the break line 33 below the break line 32, and the break line 32 between the intersection XR and the break line 33a are examples of first break lines.

[0086] Furthermore, the present disclosure is not limited to the above-described embodiments as long as it conforms to the spirit of the disclosure described in the above-described embodiments. Therefore, the present disclosure may be a configuration in which at least two of the above-described embodiments are combined, or a configuration in which any of the components illustrated or described with reference numerals in the above-described embodiments is eliminated. [Explanation of symbols]

[0087] 1...Packaging box 2L,2R...Side wall 3...Front wall 4...Back wall 5... Lid flap 6... Bottom flap 7... Glue margin 8, 17, 18L... Side 10...Main body 11L, 11R, 12L, 12R...Rings 13,14,15L,15R…Upper side 16,17,18L,18R…Lower side 21... Breaking line 22... Opening start portion 23... Compartment line 23b, 24... Folding line 25...Opening line 26...Auxiliary line 28, 28L, 28R...Upper area 29... Second auxiliary ruled line 33, 33b... Breaking line 36... Protrusion 41L, 41R...Circular break line 43L, 43R, 44...Raw line 45L, 45R...Cutting pieces 50...Upper opening 51L, 51R... outer flaps 52, 53... inner flaps, 60...Lower opening 61L, 61R...First flap 62, 63... Second flap 64L, 64R... Adhesion part, A...Sheet material XL, XR, YL, YR...Intersection

Claims

1. a cylindrical main body having a rectangular opening; a lid flap that covers at least a portion of the opening on the upper side of the main body; a bottom flap covering at least a portion of the opening on the underside of the body; A packaging box having The main body portion is a front wall, a rear wall disposed opposite the front wall, and a pair of side walls disposed between the front wall and the rear wall, which are connected to form a cylindrical shape; The front wall sides of the pair of side walls are connected to the front wall via a pair of first creases extending in the vertical direction, and the rear wall sides of the pair of side walls are connected to the rear wall via a pair of second creases extending in the vertical direction, The front wall is provided with a first break line dividing the front wall in the up-down direction, The rear wall is provided with a second break line dividing the rear wall in the up-down direction, Each of the side walls is provided with a third break line extending in a circumferential direction that intersects with the up-down direction and connecting to the first break line and the second break line, In the region above the third break line of each of the side walls, an opening start portion adjacent to a part of the third breaking line; An opening crease is formed extending from the upper portion of the opening start portion toward a corner where the first crease intersects with a side of the side wall on the upper opening side. packaging box.

2. the third break line extends to connect a first intersection where the first break line is connected to the first score line and a second intersection where the second break line is connected to the second score line, and the second intersection is located above the first intersection. The packaging box according to claim 1.

3. Each of the side walls has: At least one auxiliary crease extending parallel to the opening crease is formed in the region above the third break line. The packaging box according to claim 1 or 2.

4. The packaging box according to claim 1 or 2, wherein the opening start portion is formed closer to the front wall than the center of the side wall in the circumferential direction.

5. the first fracture line defines a protruding portion that extends upward in the front wall toward a center in the circumferential direction, The packaging box according to claim 1 , wherein the first break line has a pair of fourth break lines whose width in the circumferential direction narrows toward the upper side.

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