Packing box

Abstract

To ensure both a strength of a packaging box and ease of opening it.SOLUTION: There is provided a packaging box 10 configured such that a pair of outer flaps 18 extending from a portion of an upper edge 4E of a standing wall portion 4 are bent to form a portion of the upper edge 4E as outer base ends 18E, and outer tips 18D extending from the outer base ends 18E are butted against each other to form an outer ceiling wall portion 8 exposed on an entire surface of a top surface. The packaging box includes: a pair of non-cutout portions 8b of outer ceiling wall portions 8 each including all of the outer base ends 18E of the pair of outer flaps 18; a cutout portion 8a that is a portion of the outer ceiling wall portion 8 excluding the pair of non-cutout portions 8b and that includes an entire outer tip 18D; and a pair of curved outer breaking guide structures 8L whose strength is weakened at a boundary between the pair of non-cutout portions 8b and the cutout portion 8a of the outer ceiling wall portion 8.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging box that is opened by cutting off a portion of it. [Background technology]

[0002] In order to cut off a part of the packaging box, a break guide structure such as a perforated cut or a half cut is provided along the edge of a predetermined part that is preset as the part to be cut off. This packaging box is easy to break along the break guide structure because the strength of the part where the break guide structure is provided is reduced, and the predetermined part is removed by breaking along the break guide structure to open the box. For example, in a packaging box having a pair of outer flaps exposed on the entire top wall, it has been proposed to provide a break line as a break guide structure at the base end of the outer flaps. In this packaging box, the tips of the outer flaps are butted together and fixed with sealing tape or the like, and the entire outer flaps are cut off by breaking the corners of the packaging box along the break line provided at the base end of the outer flaps (see Patent Document 1). In the case where an attachment to be removed, such as sealing tape or an information label, is attached to the outside of the portion to be cut off in this way, the discarding of the cut off portion can omit the work of peeling off the attachments and also serve as the disposal of the attachments. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-171374 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the break guide structure is provided at the corners of the packaging box as described above, it is difficult to ensure sufficient strength to prevent deformation or damage to the packaging box because the corners of the packaging box are susceptible to stress or external force and the strength of the break guide structure is limited. On the other hand, it is difficult to ensure easy opening of a packaging box that does not have a break guide structure. Therefore, there is room for improvement in terms of achieving both strength and ease of opening of the packaging box.

[0005] The present invention was invented in consideration of the above problems, and one of its objectives is to ensure both the strength and ease of opening of the packaging box. However, other objectives of the present invention are to achieve actions and effects derived from the configurations shown in the "Mode for Carrying Out the Invention" described later, which are not obtainable with conventional technology. [Means for solving the problem]

[0006] The packaging box disclosed here is a packaging box having an outer top wall portion in which a pair of outer flaps extending from a portion of the upper edge of a standing wall portion are folded with said portion as outer base ends and outer tips extending from the outer base ends are butted together to form an outer top wall portion exposed on the entire top surface, and the outer top wall portion has a pair of non-cut portions that each include all of the outer base ends of the pair of outer flaps, a cut-out portion that is a portion of the outer top wall portion excluding the pair of non-cut portions and includes all of the outer tips, and a pair of curved outer breakage guide structures with weakened strength at the boundary between the pair of non-cut portions and the cut-out portions. Effect of the Invention

[0007] According to the disclosed packaging box, it is possible to ensure the strength of the packaging box while also making it easy to open. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a packaging box according to one embodiment. [Diagram 2]FIG. 2 is a perspective view of the packaging box of FIG. 1 with an appendix attached thereto. [Diagram 3] 2 is a plan view of a sheet material to be assembled into the packaging box of FIG. 1. [Figure 4] 2 is a diagram showing a plan view and a partially enlarged cross-sectional view of the packaging box in FIG. 1 in a folded state. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] A packaging box as an embodiment will be described with reference to the drawings. The packaging box of the present embodiment is a packaging box that is opened by cutting off a part of it, and in particular, the packaging box is a box in which an attachment to be removed, such as an information label, is attached to the outside of the part of the packaging box.

[0010] The packaging box is a three-dimensional packaging material assembled from planar sheet materials (blank sheets). The sheet materials assembled into the packaging box are sheet-like packaging materials cut into a predetermined shape. In this embodiment, the packaging box and the sheet materials are placed on a horizontal surface, and the directions used in the description are defined as follows. For packaging boxes, the horizontal direction is subdivided into the front-to-back direction (in the drawings, front is indicated with "F" and rear with "B") and the left-to-right direction (in the drawings, left is indicated with "L" and right with "R"). The left-to-right direction is defined based on the state facing from front to rear. When there is no distinction between left and right, it is called the side. Additionally, in the vertical direction, the direction in which gravity acts is defined as downward (indicated with "D" in the drawings), and the opposite direction of downward is defined as upward (indicated with "U" in the drawings).

[0011] The sheet material will be described using the X direction and the Y direction, which are mutually orthogonal in the horizontal direction. The X direction and the Y direction extend in two directions opposite to each other. One of the X directions is defined as the X1 direction, and the other is defined as the X2 direction. Similarly, one of the Y directions is defined as the Y1 direction, and the other is defined as the Y2 direction. In addition, the components of the sheet material will be described using the same reference numerals as the corresponding components in the packaging box. Furthermore, the lines and structures of the sheet material will be referred to by the same names as those in the packaging box.

[0012] In the embodiment described below, the configuration is explained in item [1], the action and effect of the configuration of item [1] is explained in the subsequent item [2], and modified examples of items [1] and [2] are described in item [3].

[0013] [1. Configuration] (packaging box) As shown in Fig. 1, a packaging box 10 according to this embodiment has an exterior shape of a horizontally elongated rectangular parallelepiped and is capable of storing items inside. The packaging box 10 has a bottom wall 1 corresponding to the lower surface of the rectangular parallelepiped, a standing wall 4 corresponding to the side surface of the rectangular parallelepiped, and a top wall 7 corresponding to the upper surface of the rectangular parallelepiped. In the packaging box 10, the bottom wall 1 and the standing wall 4 are adjacent to each other via a lower edge 1E, and the standing wall 4 and the top wall 7 are adjacent to each other via an upper edge 4E.

[0014] The standing wall portion 4 has side walls 5 erected from left and right lower edges 1E of the bottom wall portion 1, and end walls 6 erected from front and rear lower edges 1E of the bottom wall portion 1. The packaging box 10 is of the so-called A-type (mandarin orange box type). The bottom wall 1 is provided by overlapping two types of bottom wall portions 2 and 3 extending from the lower end edges 1E of the side wall portion 5 and the end wall portion 6. 7 The upper wall 8 includes two types of top walls 8 and 9 extending from the upper edges 4E of the side walls 5 and the end walls 6, which are overlapped with each other.

[0015] Of the two types of bottom wall portions 2, 3, the bottom wall portion 2 extending from the side wall portion 5 is overlapped from the outside with the bottom wall portion 3 extending from the end wall portion 6. For this reason, the bottom wall portion 2 is called the "outer bottom wall portion 2" and the bottom wall portion 3 is called the "inner bottom wall portion 3." The outer bottom wall portion 2 blocks the entire bottom surface (the lower surface of the rectangular parallelepiped) of the packaging box 10 from the outside. On the other hand, the inner bottom wall portion 3 does not block the entire bottom surface of the packaging box 10, and has two portions spaced apart in the front-to-rear direction.

[0016] Of the two types of top wall parts 8 and 9, the top of the side wall part 5 Edge The top wall portion 8 extends from the upper end edge 4E of the vertical wall portion 4. Edge 4E (other than a part of the upper end edge 4E of the standing wall portion 4). For this reason, the top wall portion 8 is referred to as the "outer top wall portion 8" and the top wall portion 9 is referred to as the "inner top wall portion 9." The outer top wall portion 8 is exposed to the entire top surface (upper surface of the rectangular parallelepiped) of the packaging box 10 and seals the top surface of the packaging box 10 from the outside. On the other hand, the inner top wall portion 9 does not cover the entire top surface of the packaging box 10 and has two portions spaced apart in the front-to-rear direction.

[0017] As described above, the packaging box 10 is a packaging box that is opened by cutting off a part of it. In this embodiment, the parts are an outer cutout 8a (cutout) that is a part of the outer top wall 8, an inner cutout 9a that is a part of the inner top wall 9, and a side cutout 6a that is a part of the end wall 6.

[0018] The outer cutout 8a extends over the entire area of ​​the outer ceiling wall 8 in the front-rear direction and is provided so as to include the entire outer tip 18D of the ceiling wall outer flap 18 described later. In this embodiment, the outer cutout 8a is provided in the left-right central portion of the outer ceiling wall 8. As described above, in the packaging box 10 of this embodiment, an attachment La to be removed, such as an information label, is attached to the outside of the portion that is cut out when the box is opened. The outer cut-out portion 8a includes, as the portion in question, a planned attachment area R where the attachment La is intended to be attached, as shown in FIG. 2. The attachment La is disposed across the outer end 18D of the top wall outer flap 18, which will be described later, in response to the outer cutout portion 8a being provided so as to include the entire outer end 18D of the top wall outer flap 18, which will be described later. In this embodiment, the attachment La is exemplified as being attached to the entire surface of the outer top wall portion 8. The above-mentioned information display label may be, for example, a waybill or slip on which the destination of the packaging box 10 and information on the sender are written.

[0019] The outer top wall portion 8 is provided with a pair of outer non-cut portions 8b (non-cut portions) on the right and left sides of the outer cut portion 8a, excluding the outer cut portion 8a, which are not cut when the packaging box 10 is opened. Each of the pair of outer non-cut portions 8b is juxtaposed to the outer cut portion 8a on both the left and right sides of the outer cut portion 8a, extends over the entire area of ​​the top wall portion 8 in the front-to-rear direction, and includes the entire outer base end 18E of a top wall outer flap 18 described later.

[0020] The inner cutout 9a is provided at a position in the inner top wall 9 that overlaps with the outer cutout 8a in a top view. In this embodiment, since the outer cutout 8a is provided in the left-right central portion of the outer top wall 8 and extends in the front-to-rear direction, the inner cutout 9a is also provided in the left-right central portion of the inner top wall 9 and extends in the front-to-rear direction. A joint 20 for joining the inner cutout 9a and the outer cutout 8a is provided on the outer (upper) surface of the inner cutout 9a. The joint 20 is formed, for example, by hot melt applied to the outer surface of the inner cutout 9a.

[0021] The top wall 9 is provided with a pair of inner non-cut portions 9b on the right and left sides of the inner cut portion 9a, which are not cut when the packaging box 10 is opened. The inner non-cut portion 9b of the pair of inner non-cut portions 9b provided on the right side of the inner cut portion 9a overlaps the outer non-cut portion 8b of the pair of outer non-cut portions 8b provided on the right side of the outer cut portion 8a in a top view. The inner non-cut portion 9b of the pair of inner non-cut portions 9b provided on the left side of the inner cut portion 9a overlaps the outer non-cut portion 8b of the pair of outer non-cut portions 8b provided on the left side of the outer cut portion 8a in a top view.

[0022] The side cutout 6a is provided above the end wall 6 and is connected to the inner cutout 9a via the upper edge 4E (more specifically, the inner base end 19E described later). In this embodiment, the inner cutout 9a is provided in the left-right center of the inner top wall 9, so the side cutout 6a is also provided in the left-right center of the end wall 6.

[0023] The packaging box 10 has a structure that allows the outer cutout portion 8a, the inner cutout portion 9a, and the side cutout portion 6a to be cut out. BreakThe guide structures 8L, 9L, and 6L are provided. The outer break guide structure 8L (long dashed line in FIG. 1) guides the cutting of the outer cutout 8a, the inner break guide structure 9L (dotted line in FIG. 1) guides the cutting of the inner cutout 9a, and the side break guide structure 6L (long dashed line in FIG. 1) guides the cutting of the side cutout 6a. The break guide structures 8L, 9L, and 6L are formed, for example, by break lines or half cuts made at the boundaries between the outer cutout 8a, the inner cutout 9a, and the side cutout 6a and other parts. For this reason, the break guide structures 8L, 9L, and 6L can also be said to be the areas where the strength is weakened at the boundaries between each cutout 8a, 9a, and 6a and other parts.

[0024] Furthermore, the packaging box 10 of this embodiment is provided with a plurality of stopper structures 32, 33, 35, 36 that prevent the packaging box 10 from folding back when the packaging box 10 is folded into a flat plate shape (hereinafter referred to as the "folded state"). Here, two types of stopper structures are provided: standing wall stopper structures 35, 36 provided on the standing wall portion 4, and bottom wall stopper structures 32, 33 (see Figs. 3 and 4) provided on the bottom wall portion 1.

[0025] (Sheet material) The above-mentioned packaging box 10 is assembled by folding a sheet material 10' as shown in Fig. 3. Here, a corrugated cardboard sheet is used as the sheet material 10', and the flutes (also called "corrugations") of this corrugated cardboard sheet are oriented in the X direction.

[0026] The sheet material 10' includes two types of flaps 12, 13 which form the bottom wall portion 1, two types of panels 15, 16 which form the vertical wall portion 4, and two types of flaps 18, 19 which form the top wall portion 7. Of the flaps 12, 13, the bottom wall outer flap 12 forms the outer bottom wall portion 2, and the bottom wall inner flap 13 forms the inner bottom wall portion 3. Of the panels 15, 16, the side wall panel 15 forms the side wall portion 5, and the end wall panel 16 forms the end wall portion 6. Of the flaps 18, 19, the top wall outer flap 18 forms the outer top wall portion 8, and the top wall inner flap 19 forms the inner top wall portion 9. Two of each of the flaps 12, 13, 18, 19 and the panels 15, 16 are provided on the sheet material 10'. The sheet material 10' also includes a joining flap 14 which functions as a seam for connecting one side wall panel 15 and one end wall panel 16 when the packaging box 10 is assembled.

[0027] The side wall panels 15 and the end wall panels 16 are arranged alternately in the Y direction, which coincides with the circumferential direction of the standing wall portion 4. As shown by thin lines in Fig. 3, a main crease S1 (crease, fold line) extending in the X direction is provided between the side wall panels 15 and the end wall panels 16. Of the two side wall panels 15, one (Y2 direction in Fig. 3) that is not disposed between the two end wall panels 16 has a joint flap 14 protruding in the Y direction (Y2 direction in Fig. 3) via the main crease S1.

[0028] The bottom outer flap 12 and the bottom inner flap 13 are respectively provided to protrude in the X1 direction from the side wall panel 15 and the end wall panel 16. A lower crease S2 (score, fold line) extending in the Y direction is provided between the bottom outer flap 12 and the side wall panel 15, and between the bottom inner flap 13 and the end wall panel 16. The lower crease S2 is a portion that forms the lower edge 1E of the packaging box 10.

[0029] The top wall outer flap 18 and the top wall inner flap 19 are respectively provided to protrude in the X2 direction from the side wall panel 15 and the end wall panel 16. An upper crease S3 (score, fold line) extending in the Y direction is provided between the top wall outer flap 18 and the side wall panel 15, and between the top wall inner flap 19 and the end wall panel 16. The upper crease S3 is a portion that forms the upper edge 4E of the packaging box 10. In other words, in the above description, the top wall outer flap 18 extends in the X2 direction from a portion that forms the upper edge 4E of the side wall portion 5 of the packaging box 10, and the top wall inner flap 19 extends in the X2 direction from a portion that forms the upper edge 4E of the end wall portion 6 of the packaging box 10. Each of the lines S1, S2, S3 and the auxiliary lines S4 and S5 described later are V-shaped grooves extending linearly along the surface of the sheet material 10', and are formed on the surface of the sheet material 10' that will become the inner surface of the packaging box 10.

[0030] After the joining flap 14 is joined to the end of one end wall panel 16, the sheet material 10' is folded along the main crease S1 so that the side wall panel 15 and the end wall panel 16 form a rectangular tube. The bottom wall outer flap 12 is folded along the lower crease S2 so that it overlaps with the bottom wall inner flap 13, and then the bottom wall outer flap 12 and the bottom wall inner flap 13 are joined together, for example, by hot melt applied to the bottom wall inner flap 13. As a result, the sheet material 10' has a box shape with an open top.

[0031] Then, after an item is placed inside the sheet material 10' shaped like this, the sheet material 10' is folded along the upper line S3 so that the outer top wall flap 18 overlaps the inner top wall flap 19, and the outer top wall flap 18 and the inner top wall flap 19 are joined together to form a packaging box 10 containing the item.

[0032] Specifically, the pair of top wall inner flaps 19 are folded with the portion of the upper line S3 forming the upper edge 4E of the end wall portion 6 as a base end (hereinafter referred to as the "inner base end 19E"), and the ends (hereinafter referred to as the "inner tip end 19D") extending from the inner base end 19E are arranged to face each other to form the inner top wall portion 9. Then, the pair of top wall outer flaps 18 are folded with the portion of the upper line S3 forming the side wall portion 4E of the end wall portion 6 as a base end (hereinafter referred to as the "inner tip end 19D"), so as to overlap the pair of top wall inner flaps 19 (inner top wall portion 4B) from above. 5 The portion forming the upper edge 4E of the packaging box 10 is folded as a base end (hereinafter referred to as the "outer base end 18E"), and the tips (hereinafter referred to as the "outer tips 18D") extending from the outer base end 18E are butted together to form the outer top wall portion 8 that is exposed to the entire top surface of the packaging box 10.

[0033] Hot melt is applied to two locations on the outer surface of each of the pair of top-wall inner flaps 19 that form the inner top wall portion 9. Each of the two locations of hot melt applied to each top-wall inner flap 19 is provided between a pair of inner breakage guide structures 9L and abuts against the inner surface of each of the pair of top-wall outer flaps 18. The hot melt then hardens to form joints 20, joining the top-wall inner flap 19 and the top-wall outer flap 18 together, and the sheet material 10' is assembled into the packaging box 10.

[0034] (Break guide structure) The breakage guide structures 8L, 9L, and 6L will be described in detail below with reference to FIGS. As shown in FIG. 1, a pair of outer break guide structures 8L are provided on both the left and right sides of the outer cutout 8a and extend over the entire area in the front-rear direction of the outer ceiling wall portion 8. The pair of outer break guide structures 8L are both curved and are line-symmetrical with respect to the outer tip 18D of the ceiling wall outer flap 18. Here, a wavy outer break guide structure 8L with repeated arc-shaped concaves and convexes in the left-right direction is illustrated. In detail, the outer break guide structure 8L is wavy with three arc-shaped peaks protruding inward and two arc-shaped peaks protruding outward, with the apexes of the arc-shaped peaks protruding outward as the front and rear end points (start point, end point).

[0035] Here, as described above, the outer ceiling wall portion 8 in which the outer cutout portion 8a is provided is a portion formed by butting the outer tips 18D of the pair of ceiling wall outer flaps 18, and the outer cutout portion 8a includes all of the outer tips 18D. For this reason, it can be said that the outer breakage guide structure 8L is provided in each of the pair of ceiling wall outer flaps 18 as shown in Fig. 3. It can also be said that each of the pair of ceiling wall outer flaps 18 is provided with the outer cutout portion 8a including all of the outer tips 18D and the outer non-cutout portion 8b including all of the outer base end 18E, and the outer breakage guide structure 8L is provided along the boundary between the outer cutout portion 8a and the outer non-cutout portion 8b.

[0036] The inner breakage guide structure 9L extends along the boundary between the pair of inner non-cut portions 9b and the inner cut portion 9a, which extend from the inner tip 19D to the inner base end 19E. In this embodiment, as shown in FIG. 1, the inner breakage guide structure 9L is provided in pair on both the left and right sides of the inner cut portion 9a and extends linearly in the front-rear direction.

[0037] Here, as described above, because the inner top wall portion 9 consisting of a pair of top wall inner flaps 19 is spaced apart in the front-rear direction, a total of four inner breakage guide structures 9L are provided, one pair for each of the front and rear inner cutout portions 9a. In other words, as shown in Fig. 3, one pair of inner breakage guide structures 9L is provided for each top wall inner flap 19. Each of the pair of inner breakage guide structures 9L provided on each top wall inner flap 19 overlaps a pair of outer breakage guide structures 8L, as shown in Fig. 1.

[0038] More specifically, the inner break guide structure 9L is disposed on the center line of the amplitude of the corrugated outer break guide structure 8L with which the inner break guide structure 9L overlaps. Therefore, the ends of the pair of inner break guide structures 9L on the inner base end 19E side are located closer to the outer tip 18D than the ends of the pair of outer break guide structures 8L on the inner base end 19E side. In other words, referring to FIG. 1, the front-rear end of the pair of inner break guide structures 9L is located closer to the left-right center of the packaging box 10 than the front-rear end of the pair of outer break guide structures 8L.

[0039] The side break guide structure 6L is provided to surround the side cutout portion 6a together with the inner base end 19E. Specifically, the side break guide structure 6L has a pair of first break lines 61L (first break guide structure) extending from the inner base end 19E toward the lower edge 1E side, and a second break line 62L (second break guide structure) connecting the lower ends of the first break lines 61L, and the first break lines 61L, the second break line 62L, and the inner base end 19E define the side cutout portion 6a.

[0040] The pair of first break lines 61L are connected to the pair of inner break guide structures 9L provided on each top wall inner flap 19. Specifically, the first break lines 61L are connected to the ends of the inner break guide structures 9L on the inner base end 19E side. The pair of first break lines 61L extend so as to approach each other as they move away from the inner base end 19E. The second break line 62L connects the ends of the pair of first break lines 61L opposite the inner base end 19E side, i.e., the ends on the lower edge 1E side, and extends along the inner base end 19E.

[0041] Furthermore, the side break guide structure 6L has a pair of third break lines 63L (third break guide structures) that extend from each of the ends of the pair of first break lines 61L on the lower end edge 1E side in a direction away from the inner base end 19E. The pair of third break lines 63L are provided to form finger holes that enable the ends of the side cutout portion 6a to be grasped from the outside of the packaging box 10 when the packaging box 10 is opened. The pair of third break lines 63L are 62L When the packaging box 10 is opened, the second break line 62L and the third break line 63L are broken, so that the cut-out portion (a tongue portion 36a described later) can be folded around the lower end as an axis and pushed inward. This forms a finger hole for gripping the end of the side cut-out portion 6a.

[0042] (Stopper structure) The stopper structures 32, 33, 35, 36 will be described in detail below with reference to Figures 1, 3, and 4. Figure 4 shows the folded packaging box 10 together with a partially enlarged cross-sectional view thereof. When the folded packaging box 10 in Figure 4 is compared with the packaging box 10 in Figure 1, the right side wall 5 and the rear end wall 6 are flat, and below them (the back side of the page) the left side wall 5 and the front end End Wall 3, the folded packaging box 10 in FIG. 4 corresponds to a state in which the end wall panel 16 on the Y1 direction side is folded to the back side of the page along the main line S1, and the side wall panel 15 on the Y2 direction side is folded to the back side of the page along the main line S1.

[0043] As shown in FIG. 4, the vertical wall stopper structures 35, 36 are provided on each of the overlapping side wall portions 5 and end wall portions 6 of the packaging box 10 in the folded state, and function as stoppers that prevent the packaging box 10 in the folded state from folding back by folding the tongue portions 35a, 36a of the side wall portions 5 and end wall portions 6 together.

[0044] As shown in FIG. 1 and FIG. 3, the vertical wall stopper structure 35 provided on the side wall portion 5 (side wall panel 15) has an auxiliary break line 35L (auxiliary break guide structure) and an auxiliary crease S4. The vertical wall stopper structure 36 provided on the end wall portion 6 (end wall panel 16) has an auxiliary break line 36L and an auxiliary crease S4. In this embodiment, the auxiliary break line 36L of the end wall portion 6 is composed of the second break line 62L and the third break line 63L constituting the side break guide structure 6L. The auxiliary break line 35L of the side wall portion 5 is provided so as to overlap with the second break line 62L and the third break line 63L in the folded state. That is, the auxiliary break line 35L of the side wall portion 5 is provided at a position corresponding to the auxiliary break line 36L of the end wall portion 6 in the folded state, and is provided in a channel shape opening toward the lower edge 1E (lower crease S2) side.

[0045] The auxiliary crease S4 of the side wall 5 is a crease that connects both ends of the auxiliary break line 35L, and the side wall 5 has a tongue portion 35a that can swing around the auxiliary crease S4 as an axis when the auxiliary break line 35L is broken. Similarly, the auxiliary crease S4 of the end wall 6 is a crease that connects both ends of the auxiliary break line 36L, and the end wall 6 has a tongue portion 36a that can swing around the auxiliary crease S4 as an axis when the auxiliary break line 36L is broken. As shown in the partially enlarged cross-sectional view on the left side of FIG. 4, in the folded state, the tongue portions 35a, 36a are folded in the same direction while overlapping each other. As a result, the side wall 5 and the end wall 6 are pressed against each other near the auxiliary break line S4, preventing the packaging box 10 from folding back.

[0046] As shown in FIG. 4, the bottom wall stopper structures 32, 33 are provided on each of the overlapping bottom wall outer flap 12 and bottom wall inner flap 13 in the folded packaging box 10, and function as stoppers that prevent the packaging box 10 from bulging in the folded state by folding the tongue portions 32a, 33a of the bottom wall outer flap 12 and the bottom wall inner flap 13 together.

[0047] 3, the bottom wall stopper structure 32 provided on the bottom wall outer flap 12 has an auxiliary breaking line 32L and an auxiliary crease S5. The bottom wall stopper structure 33 provided on the bottom wall inner flap 13 has an auxiliary breaking line 33L and an auxiliary crease S5.

[0048] The auxiliary break lines 32L of the bottom wall outer flap 12 are two break lines extending from the edge of the sheet material 10' adjacent to the bottom wall inner flap 13, and the more they move away from the edge, the closer they become to each other. The auxiliary crease S5 of the bottom wall outer flap 12 extends along the edge and connects the ends of the auxiliary break lines 32L. In other words, the bottom wall stopper structure 32 of the bottom wall outer flap 12 has an outer diameter of an isosceles trapezoid.

[0049] Similarly, the auxiliary breaking lines 33L of the bottom-wall inner flap 13 are two breaking lines extending from the edge of the sheet material 10' adjacent to the bottom-wall outer flap 12, and the more they move away from the edge, the closer they become to each other. The auxiliary crease S5 of the bottom-wall inner flap 13 extends along the edge and connects the ends of the auxiliary breaking lines 33L.

[0050] The bottom outer flap 12 and the bottom inner flap 13 have tongue portions 32a and 33a that can swing about the auxiliary score line S5 when the auxiliary score lines 32L and 33L are broken. As shown in the partially enlarged cross-sectional view at the bottom of Fig. 4, in the folded state, the tongue portions 32a and 33a are folded in the same direction while overlapping each other. This causes the bottom outer flap 12 and the bottom inner flap 13 to be pressed against each other near the auxiliary score line S5, preventing the packaging box 10 from folding back.

[0051] [2. Actions and Effects] Since the packaging box 10 of this embodiment is configured as described above, it can provide the following actions and effects.

[0052] The packaging box 10 is provided with a pair of outer break guide structures 8L whose strength is weakened along the boundary between the outer cut-out portion 8a and the outer non-cut-out portion 8b. As a result, when the packaging box 10 is opened, the pair of outer break guide structures 8L guides the break, so that the outer cut-out portion 8a can be easily cut off from the outer top wall portion 8. Therefore, the packaging box 10 can be easily opened. Furthermore, since the outer cut-out portion 8a includes the intended attachment region R, the attachment La can be peeled off together with the outer cut-out portion 8a when the outer cut-out portion 8a is cut off. Therefore, the peeling and disposal of the attachment La from the top wall portion 7 can be omitted.

[0053] The packaging box 10 is provided with an outer non-cut portion 8b that includes the entire outer base end 18E. In other words, since the outer breakage guide structure 8L is not provided at the outer base end 18E, a decrease in strength of the corners to which external forces are likely to be applied is suppressed. This contributes to ensuring the strength of the packaging box 10. Furthermore, since the outer non-cut portion 8b remains without being cut when the packaging box 10 is opened, a large amount of material can be secured for waste paper recycling.

[0054] Since the outer break guide structure 8L is curved, it is possible to prevent the packaging box 10 from cracking or breaking along the outer break guide structure 8L. In particular, since cardboard has a property that it is easily broken from a linear break line, making the outer break guide structure 8L curved contributes to ensuring the strength of the packaging box 10. In addition, when the packaging box 10 is opened, the curved outer break guide structure 8L can prevent the occurrence of a problem in which the top wall outer flap 18 breaks midway, compared to when it is linear. Furthermore, if the break guide structure is linear, there is a possibility that the appendage La will break linearly along the break guide structure and remain on the top wall when the packaging box is opened. However, in the packaging box 10 of this embodiment, since the outer break guide structure 8L is curved, it is possible to prevent the appendage La from breaking as described above.

[0055] By providing the inner break guide structure 9L and the side break guide structure 6L, the outer cutout portion 8a and the inner cutout portion 9a can be grasped and pulled up together from the end wall portion 6. Therefore, the outer cutout portions 8a provided on each of the pair of top wall outer flaps 18 can be simultaneously pulled off together with the inner cutout portions 9a, and the packaging box 10 can be easily opened.

[0056] The top wall inner flap 19 has a joint 20 between the pair of inner break guide structures 9L, which is joined to each of the outer cutouts 8a of the pair of top wall outer flaps 18. This allows the force pulling up the inner cutout 9a to be transmitted to the outer break guide structures 8L via the joint 20, so less force is required to open the package, making it easier to open.

[0057] Furthermore, in the above embodiment, not only are the inner cutout 9a and the outer cutout 8a joined to each other by the joint 20, but the side cutout 6a and the inner cutout 9a are connected to each other via the upper edge 4E. 9a and outer cutout 8a Packing box with these items together in this order 10 This allows the packaging box 10 to be easily opened.

[0058] The inner break guide structure 9L is linear, which can improve ease of opening. The top wall inner flap 19 arranged inside the top wall outer flap 18 does not easily affect the strength of the packaging box 10. The break guide structure 9L provided on such a top wall inner flap 19 is configured with a linear break line that is easily broken. This can improve ease of opening while suppressing a decrease in the strength of the packaging box 10.

[0059] The end portions of the pair of inner breakage guide structures 9L on the inner base end 19E side are located closer to the outer tip 18D than the end portions of the pair of outer breakage guide structures 8L on the inner base end 19E side. edge 1 On the 9E side, the inner break guide structure 9L does not overlap with the outer non-cut portion 8b on the side of the outer break guide structure 8L. Inner cutout When the end portion of the inner base end 19E of the 9a is pulled up, Inner cutout The force pulling up 9a is not hindered by the outer uncut portion 8b, so that the force can be efficiently transmitted to the outer breakage guide structure 8L to break it, thereby further improving the ease of opening.

[0060] The side cutout 6a can be cut off by the first break line 61L and the second break line 62L provided on the end wall 6. Since the side cutout 6a is connected to the inner cutout 9a, by starting to cut from the side cutout 6a when opening the package, it is possible to easily cut off the inner cutout 9a that is not exposed to the outside of the packaging box 10. Furthermore, the pair of first break lines 61L approach each other as they move away from the inner base end 19E, in other words, they move away from each other as they approach the inner base end 19E. In other words, the left-right width of the side cutout 6a becomes wider as it approaches the inner base end 19E. This makes it difficult for the side cutout 6a to tear off when the lower end of the side cutout 6a is grasped and pulled up, and therefore makes it possible to reliably cut off the inner cutout 9a connected to the side cutout 6a.

[0061] The provision of the second break line 62L and the third break line 63L forming the finger holes can further improve the ease of opening the packaging box 10. In other words, when opening the packaging box 10, the second break line 62L and the third break line 63L are broken, and the finger is hooked into the finger hole formed by the breaking of the second break line 62L and the third break line 63L, and the end of the side cutout portion 6a is grasped and pulled up, so that the side cutout portion 6a and the inner cutout portion 6b are separated from each other. 9a and outer cutout 8a They can be easily peeled off together from the packaging box 10 in this order.

[0062] The packaging box 10 is provided with stopper structures 32, 33, 35, and 36 that prevent the packaging box 10 from folding back when folded. This makes it possible to reduce the bulkiness of the packaging box 10 when folded, which contributes to space saving. This can improve the convenience of the packaging box 10.

[0063] [3. Modifications] The above-described embodiment is merely an example, and is not intended to exclude various modifications and application of techniques not explicitly stated in the embodiment. Each configuration of the present embodiment can be modified in various ways without departing from the spirit of the embodiment. In addition, the configurations can be selected as necessary, and can be combined appropriately. The curved pair of outer break guide structures 8L are not limited to a wavy shape. The shape of the outer break guide structure 8L may be, for example, an arch shape in which the center part in the front-rear direction bulges toward the side, or an arch shape that narrows toward the left-right center part. The pair of outer break guide structures 8L do not have to be line-symmetrical with respect to the outer tip 18D.

[0064] In the above embodiment, the outer cutout 8a is provided in the left-right center of the outer ceiling wall 8, but the outer cutout 8a may be provided to the right or left of the left-right center of the outer ceiling wall 8. The outer cutout 8a may extend so as to be inclined relative to the front-rear direction, or may extend in a curved shape, for example, to draw an arch. Similarly, the outer tip 18D may extend so as to be inclined relative to the front-rear direction, or may extend in a curved shape, for example, to draw an arch. In other words, the pair of ceiling wall outer flaps 18 constituting the outer ceiling wall 8 need not have the same shape as each other as long as the outer tips 18D are butted against each other to form an outer ceiling wall exposed to the entire surface of the ceiling surface.

[0065] The inner break guide structure 9L and the side break guide structure 6L may be omitted, and each of the inner break guide structure 9L and the side break guide structure 6L may have a configuration (shape) different from that of the above-mentioned embodiment. For example, the side break guide structure may be provided on the inner base end 19E to connect the ends of the pair of inner break guide structures 9L on the inner base end 19E side. The packaging box is not limited to the A-type, and may be, for example, a semi-A-type. In other words, the bottom wall portion 1 does not have to have a double structure. Also, the inner flap 19 (the inner top wall portion 9) may be omitted. [Explanation of symbols]

[0066] 1 Bottom wall 1E Bottom edge 2 Outer bottom wall 3 Inner bottom wall 4 Vertical wall 4E Top edge 5 Side wall 6 End wall 6a side cutout 6L side break guide structure 7 Ceiling wall 8 Outer ceiling wall 8a Outside cutout (cutout) 8b Outside non-cutting part (non-cutting part) 8L Outer break guide structure 9 Inner ceiling wall 9a Inner cutout 9L Internal break guide structure 10 packaging box 12 Bottom wall outer flap 13 Bottom wall inner flap 14 Joint flap 15 Sidewall Panel 16 End Wall Panel 18 Ceiling outer flap 18D outer tip 18E External proximal end 19 Ceiling wall inner flap 19D Inner Tip 19E Inner proximal end 20 Joint 32,33 Bottom wall stopper structure 32a,33a Tongue part 32L, 33L Auxiliary breaking line 35,36 Vertical wall stopper structure 35a,36a Tongue part 35L Auxiliary break line (auxiliary break guide structure) 36L Auxiliary breaking line 61L First break line (first break guide structure) 62L Second break line (Second break guide structure) 63L Third break line (third break guide structure) La adduct R Area to be pasted S1 Main ruled line (broken line) S2 Bottom border S3 Top border S4, S5 auxiliary lines

Claims

1. a pair of outer flaps extending from a part of an upper edge of a standing wall portion are folded with the part as an outer base end, and outer tips extending from the outer base ends are butted against each other to form an outer top wall portion exposed on the entire top surface, and inner flaps extending from other parts of the upper edge of the standing wall portion excluding the part as an inner base end are folded with the other parts as inner base ends to overlap inside the outer top wall portion and form a top wall portion together with the outer top wall portion, A pair of non-cutout portions of the outer top wall portion, each of which includes all of the outer base ends of the pair of outer flaps; A cutout portion that is a portion of the outer ceiling wall portion excluding the pair of non-cutout portions and includes the entire outer tip; A pair of curved outer break guide structures having reduced strength at boundaries between the pair of non-cutout portions and the cutout portions of the outer ceiling wall portion; An inner cutout portion of the inner ceiling wall portion overlaps with the cutout portion in a top view; A pair of inner non-cutout portions overlapping the pair of non-cutout portions in a top view of the inner ceiling wall portion; A pair of inner breakage guide structures, the strength of which is weakened at the boundaries between the pair of inner non-cutout portions and the inner cutout portions, which extend from the inner tip end extending from the inner base end to the inner base end of the inner top wall portion; and a side breakage guide structure that connects the end portions of the pair of inner breakage guide structures on the inner base end side and has a weakened strength. A packaging box characterized by:

2. A joint portion is provided to join the cutout portion and the inner cutout portion.

2. The packaging box according to claim 1 .

3. The end portions of the pair of inner breakage guide structures on the inner base end side are provided on the outer tip side relative to the end portions of the pair of outer breakage guide structures on the inner base end side.

3. The packaging box according to claim 1 or 2.

4. The side breakage guide structure is The inner flap is provided on an end wall portion that is a part of the standing wall portion and is connected to the inner base end, a pair of first break guide structures connected to the ends of the pair of inner break guide structures on the inner base end side, respectively, and extending so as to approach each other as they move away from the inner base end; and a second break guide structure connecting the ends of the pair of first break guide structures opposite to the inner base end side. The packaging box according to any one of claims 1 to 3.

5. The side breakage guide structure is A pair of third break guide structures extending from the end portions of the pair of first break guide structures opposite the inner base end in a direction away from the inner base end.

5. The packaging box according to claim 4.

6. The packaging box further includes an auxiliary break guide structure that is a part of the upright wall portion, is connected to the end wall portion via a fold line, and is provided on a side wall portion that is laminated on the end wall portion when the packaging box is folded at the fold line, and has a weakened strength at a portion that overlaps with the second break guide structure and the pair of third break guide structures when the packaging box is folded. The packaging box according to claim 5 .

7. The cutout portion includes a label attachment area that is disposed across the outer tip and is intended to have a label attached thereto. The packaging box according to any one of claims 1 to 6.

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