JP2023101144A - packaging box - Google Patents

Abstract

To suppress breakage of a corner portion due to biting of a band in a packaging box.SOLUTION: There is provided a packaging box 1 having a corner portion 31 formed by bending two surface portions 11 and 13 connected to each other along a boundary line, the packaging box including a ridgeline 51 and a slit 61. The ridgeline 51 extends on the boundary line between the two surface portions 11 and 13 at the corner portion 31. The slit 61 is cut in a convex shape from the ridgeline 51 in either one of the two surface portions 11 and 13.SELECTED DRAWING: Figure 1

Description

This case relates to a packaging box on which a band can be hung.

A packaging box for packaging an article is sometimes wrapped with a band to prevent unintentional opening and to improve transportability. A packaging box around which a band is wound has a problem in that the tightening force of the band tends to cause tearing or crushing at the corners where stress is concentrated. On the other hand, Patent Document 1 discloses a technique in which ruled lines (folds) forming a leaf-shaped contour are provided at the corners of a cardboard packaging box, and the portion surrounded by the ruled lines is recessed inside the packaging box. Proposed. According to the technique disclosed in Patent Document 1, since the corners of the packaging box have an obtuse angle, damage to the corners due to banding can be prevented.

Japanese Utility Model Laid-Open No. 59-38224

However, simply providing creases for folding the corners of the packaging box into an obtuse angle as described above may not properly fold the corners at the creases. If the corners are not properly obtuse, there is a risk of damage (unintended tearing or crushing) of the corners due to the biting of the band. Therefore, the technique of Patent Document 1 has room for improvement.

The packaging box of the present case was invented in view of the above problems, and one of the purposes is to suppress damage to the corners due to biting of the band. In addition to this purpose, it is also possible to achieve actions and effects that are derived from each configuration shown in the "Mode for Carrying Out the Invention" described later and that cannot be obtained with conventional techniques. It can be positioned as another purpose.

The packaging box of the present case is a packaging box that forms a corner by bending two surfaces connected to each other along a boundary line, and a ridge extending on the boundary line at the corner and the two and a slit that is cut in a convex shape from the ridge line on either one of the surface portions.

According to the packaging box of this case, it is possible to suppress damage to the corners due to biting of the band.

It is a perspective view showing the state where the band was put on the packaging box concerning one embodiment. 1. It is a side view (a figure which looked at the packaging box from the width direction) which shows the state in the middle of assembling the packaging box of FIG. FIG. 2 is a plan view for explaining slits formed in the packaging box of FIG. 1; FIG. 5 is a plan view (a view corresponding to FIG. 3) explaining a slit according to a first modified example; FIG. 11 is a plan view (a view corresponding to FIG. 3) explaining a slit according to a second modified example; FIG. 2 is an exploded view of the packaging box of FIG. 1; FIG. 2 is a schematic cross-sectional view (cross-sectional view taken along the line AA in FIG. 1) for explaining the action of the packaging box of FIG. 1; It is an expanded view of the packaging box which concerns on a modification.

Hereinafter, the form for carrying out this case is demonstrated. The embodiments shown below are merely examples, and are not intended to exclude various modifications and application of techniques not explicitly described here. Each configuration of the following embodiments can be modified in various ways without departing from the spirit thereof. Also, they can be selected or combined as needed.

[1. composition]
[1-1. packaging box]
As shown in FIG. 1, the packaging box 1 of the present embodiment has a three-dimensional shape having a space inside for accommodating articles in an assembled state. Here, a packaging box 1, which is a so-called A-type (0201 type) cardboard box (box), is exemplified.

Hereinafter, the configuration of the packaging box 1 will be described assuming that the assembled packaging box 1 is placed on a horizontal surface. In the following description, the space side inside the packaging box 1 is also called "inside", and the opposite side is also called "outside". Further, as directions related to the packaging box 1, a depth direction D1, a length direction D2 and a width direction D3 are defined. The depth direction D1 is also the vertical direction (vertical direction, height direction), and the length direction D2 and the width direction D3 are also horizontal directions. The depth direction D1, the length direction D2 and the width direction D3 are orthogonal to each other.

The packaging box 1 of this embodiment has a rectangular parallelepiped shape. The packaging box 1 has four vertical surface portions 11 and 12 arranged along the depth direction D1, and four horizontal surface portions 13 and 14 arranged along the horizontal direction (length direction D2 and width direction D3). have All of these surface portions 11 to 14 are rectangular.

The vertical surface portions 11 and 12 are composed of a pair of long surface portions 11 arranged along the depth direction D1 and the length direction D2 and a pair of short surface portions 12 arranged along the depth direction D1 and the width direction D3. subdivided. The pair of long surface portions 11 are spaced apart from each other in the width direction D3, and the pair of short surface portions 12 are spaced apart from each other in the length direction D2. These vertical surface portions 11 and 12 are in the shape of a square tube. In addition, the dimensions of the vertical surface portions 11 and 12 in the depth direction D1 are equal to each other. Moreover, the dimension of the long surface portion 11 in the length direction D1 is larger than the dimension of the short surface portion 12 in the width direction D3. However, various dimensions of the vertical surface portions 11 and 12 are not limited to those illustrated here.

The horizontal surface portions 13 and 14 are subdivided into a pair of top surface portions 13 respectively connected to the upper edges of the pair of long surface portions 11 and a pair of bottom surface portions 14 respectively connected to the lower edges of the pair of long surface portions 11. . The pair of top surface portions 13 are arranged on the same plane after being bent from the pair of long surface portions 11 toward each other. Similarly, the pair of bottom surface portions 14 are bent toward each other from the pair of long surface portions 11 and arranged on the same plane below the pair of top surface portions 13 .

The long surface portion 11 and the top surface portion 13 (two surface portions) connected to each other form a corner portion 31 by being bent along the boundary line between the two. Similarly, the long surface portion 11 and the bottom surface portion 14 (two surface portions) connected to each other form a corner portion 32 by being bent along the boundary line between the two. Hereinafter, the corner portion 31 formed by the long surface portion 11 and the top surface portion 13 is also referred to as the "upper corner portion 31", and the corner portion 32 formed by the long surface portion 11 and the bottom surface portion 14 is also referred to as the "lower side corner portion 32". Also, the upper corner portion 31 and the lower corner portion 32 are collectively referred to as "corner portion 3". All of the corners 3 of this embodiment form substantially right angles.

FIG. 2 is a side view of the packaging box 1 in the middle of assembly as seen from the width direction D3, and shows a state before the top surface portion 13 is folded from the long surface portion 11. FIG. As shown in FIG. 2, the packaging box 1, which is an A-type box, has a pair of top inner surface portions 15 respectively connected to the upper edges of the pair of short surface portions 12 and the lower edges of the pair of short surface portions 12 respectively. It also has a pair of bottom inner surface portions 16 .

The pair of top inner surface portions 15 are arranged along the horizontal direction after being bent from the pair of short surface portions 12 in the direction of approaching each other. After that, the top surface portion 13 is put over the top inner surface portion 15 . Similarly, the pair of bottom inner surface portions 16 are bent from the pair of short surface portions 12 toward each other and arranged in the horizontal direction. After that, the bottom surface portion 14 is placed under the bottom inner surface portion 16 . Therefore, in the assembled packaging box 1 (see FIG. 1), the top inner surface portion 15 and the bottom inner surface portion 16 are covered by the top surface portion 13 and the bottom surface portion 14, respectively.

In this embodiment, corrugator creases 4 that guide bending are provided on each of the boundary line between the long surface portion 11 and the top surface portion 13 and the boundary line between the short surface portion 12 and the top inner surface portion 15 . Similarly, a corrugator ruled line 4 is also provided on each of the boundary line between the long surface portion 11 and the bottom surface portion 14 and the boundary line between the short surface portion 12 and the bottom inner surface portion 16 . The corrugator ruled lines 4 are creases (grooves) processed on the inner surface (inner surface) of the packaging box 1 . The long surface portion 11 and the top surface portion 13 form the upper corner portion 31 by being bent along the corrugator ruled line 4 provided on the boundary between the two. Similarly, the long surface portion 11 and the bottom surface portion 14 are bent along the corrugator ruled line 4 provided on the boundary between the two to form the lower corner portion 32 .

As shown in FIG. 1, a strip-shaped band 7 is wound around the packaging box 1 . The band 7 is a so-called PP band made of plastic. The band 7 is arranged to tighten the long surface portion 11, the top surface portion 13 and the bottom surface portion 14 from the outside, thereby preventing the top surface portion 13 and the bottom surface portion 14 from being unintentionally opened. Although FIG. 1 illustrates the packaging box 1 around which two bands 7 are wound, the number of bands 7 wound around the packaging box 1 is not particularly limited. In addition, instead of the configuration in which the band 7 is wound around one packaging box 1 as in the present embodiment, a plurality of packaging boxes 1 are integrated by winding a common band 7 around the plurality of packaging boxes 1. may

The packaging box 1 has a ridgeline 5 extending on a boundary line (that is, a corrugator crease 4) between the two surface portions at a corner portion 3 formed by the two surface portions, and a ridgeline 5 at either one of the two surface portions forming the corner portion 3. and a slit 6 cut in a convex shape from the bottom. In the present embodiment, the corner 3 includes the upper corner 31 and the lower corner 32, the edge line 5 includes the upper edge line 51 and the lower edge line 52, and the slit 6 includes the upper slit 61 and the lower slit 62. including.

The upper ridgeline 51 extends on the boundary line between the long surface portion 11 and the top surface portion 13 . On the other hand, the lower ridgeline 52 extends on the boundary line between the long surface portion 11 and the bottom surface portion 14 . All of the ridgelines 5 of this embodiment extend linearly along the length direction D2 and overlap the corrugator ruled lines 4 .

The upper slit 61 is cut in a convex shape from the upper ridgeline 51 in either one of the long surface portion 11 and the top surface portion 13 . The upper slit 61 of the present embodiment is provided on the top surface portion 13 and not provided on the long surface portion 11 . On the other hand, the lower slit 62 is cut in a convex shape from the lower ridgeline 52 in either one of the long surface portion 11 and the bottom surface portion 14 . The lower slit 62 in this embodiment is provided in the bottom surface portion 14 and not provided in the long surface portion 11 . Thus, the slits 6 of this embodiment are both provided on the horizontal surface portions 13 and 14 and not provided on the vertical surface portions 11 and 12 .

Here, two upper slits 61 are provided at intervals in the length direction D2 for each upper edge line 51, and two lower slits 62 are provided at intervals in the length direction D2 for each lower edge line 52. A spaced example is shown. The upper slit 61 and the lower slit 62 are formed at positions corresponding to each other. Specifically, the upper slit 61 and the lower slit 62 are aligned in the longitudinal direction D2. A belt 7 overlaps the outside of each slit 6 .

In addition, the number and arrangement of the slits 6 may be appropriately set according to the number and arrangement of the bands 7 wound around the packaging box 1 . For example, in the packaging box 1 around which one band 7 is wound, one upper slit 61 is provided near the center of each upper edge line 51 in the length direction D2, and the center of each lower edge line 52 in the length direction D2 is provided. One lower slit 62 may be provided nearby. In addition, in the two upper and lower packaging boxes 1 integrated with at least one band 7, at least one upper slit 61 is provided for each upper edge line 51 of the upper packaging box 1, and the lower packaging box 1 At least one lower slit 62 may be provided for each lower edge line 52 . That is, in this case, the lower slit 62 may be omitted from the upper packaging box 1 and the upper slit 61 may be omitted from the lower packaging box 1 .

FIG. 3 is a plan view showing the periphery of the slit 6 when the two face portions forming the corner portion 3 are arranged along the same plane. 3 and later-described FIGS. 4 and 5 illustrate the upper slit 61 when the long surface portion 11 and the top surface portion 13 are arranged along the same plane, and the lower slit 62 is the same (vertical symmetry). formed in 3 to 5, since the top surface portion 13 is not bent from the long surface portion 11, the portion corresponding to the upper ridge line 51 is indicated by an imaginary line.

As shown in FIG. 3 , the slit 6 is a linear cut formed in at least one of the two surface portions forming the corner portion 3 . Both ends 6 a of the slit 6 overlap the ridgeline 5 . An intermediate portion 6b connecting both end portions 6a of the slit 6 defines the convex portion 8 together with the ridgeline 5. As shown in FIG. The convex portion 8 is a flap-like portion separated by the slit 6 on at least one of the two surface portions forming the corner portion 3 . The convex portion 8 bends toward the inside of the packaging box 1 when a tightening force from the belt 7 is applied.

The slit 6 of the present embodiment is cut in either one of the two surface portions forming the corner portion 3 in a bracket shape (arc shape) protruding from the ridgeline 5 . Here, an upper slit 61 cut in a round bracket shape protruding from the upper edge line 51 in the top surface portion 13 is illustrated. In addition, the lower slit 62 is cut in the bottom surface portion 14 in a parenthesis shape protruding from the lower ridge line 52 . The convex portion 8 defined by the bracket-shaped slit 6 and the edge line 5 forms an arc surrounded by the arc drawn by the slit 6 and the chord drawn by the edge line 5 .

However, the shape of the slit 6 is not limited to the round bracket shape as described above. For example, as shown in FIG. 4 , the slit 6 may be cut into a hexagonal bracket shape that protrudes from the ridge line 5 on either one of the two surface portions forming the corner portion 3 . The hexagonal bracket-shaped slit 6 has a parallel portion 6c extending linearly parallel to the ridgeline 5 and a pair of oblique portions 6d extending obliquely from both ends of the parallel portion 6c to the ridgeline 5 so as to be separated from each other. The convex portion 8 defined by the hexagonal bracket-shaped slit 6 and the ridgeline 5 forms a trapezoid in which the slit 6 corresponds to the upper base and the leg and the ridgeline 5 corresponds to the lower base.

Alternatively, as shown in FIG. 5, the slits 6 may be cut in a wave shape. The wave-shaped slit 6 has a parenthesis-shaped main portion 6e projecting from the ridgeline 5 at one of the two surface portions forming the corner portion 3, and is connected to both ends of the main portion 6e, and is connected to either of the two surface portions. On the other hand, it has a pair of parenthesis-shaped auxiliary portions 6 f that protrude from the ridgeline 5 . FIG. 5 shows an upper slit having a parenthesis-shaped main portion 6e projecting from the upper edge line 51 on the top surface portion 13 and a pair of parentheses-shaped auxiliary portions 6f projecting from the upper edge line 51 on the long surface portion 11. 61 are exemplified.

The convex portion 8 defined by the wavy slit 6 and the ridgeline 5 includes a main convex portion 8a defined by the main portion 6e and the ridgeline 5 and a pair of auxiliary portions defined by the auxiliary portion 6f and the ridgeline 5. and a convex portion 8b. The main convex portion 8a has an arched shape surrounded by an arc drawn by the main portion 6e and a chord drawn by the ridgeline 5. As shown in FIG. Further, each auxiliary convex portion 8b has an arcuate shape surrounded by an arc drawn by the auxiliary portion 6f and a chord drawn by the ridgeline 5. As shown in FIG. FIG. 5 illustrates a slit 6 in which the dimension of the main portion 6e is larger than the dimension of each auxiliary portion 6f in the length direction D2, which is the direction in which the ridgeline 5 extends.

[1-2. sheet material]
The packaging box 1 of this embodiment is formed from one sheet material 2 shown in FIG. Here, the sheet material 2, which is a cardboard sheet, is exemplified. Hereinafter, the configuration of the sheet material 2 will be described assuming that the sheet material 2 extends along a plane. In other words, the sheet material 2 described below corresponds to a state in which the packaging box 1 is laid out flat.

In the following description, a horizontal direction Dx and a vertical direction Dy are defined as directions for the sheet material 2 . The horizontal direction Dx and the vertical direction Dy are orthogonal to each other on the plane in which the sheet material 2 extends. In the sheet material 2 assembled into the A-type corrugated cardboard box, the hollow portion formed by the corrugated core of the corrugated cardboard sheet extends along the vertical direction Dy.

In the sheet member 2, four panels 21 and 22 are arranged in the horizontal direction Dx, and flaps 23 to 26 are protruded on both sides of the panels 21 and 22 in the vertical direction Dy. The vertical surface portions 11 and 12 of the packaging box 1 are formed by panels 21 and 22 of the sheet material 2 . Further, the horizontal surface portions 13 and 14 of the packaging box 1 are formed by the flaps 23 to 26 of the sheet material 2. As shown in FIG.

The panels 21 and 22 are subdivided into a pair of long panels 21 that form the long surface portion 11 of the packaging box 1 and a pair of short panels 22 that form the short surface portion 12 of the packaging box 1 . The flaps 23 to 26 are four outer flaps 23 and 24 that form the top surface portion 13 and the bottom surface portion 14 of the packaging box 1, and four inner flaps 25 that form the top inner surface portion 15 and the bottom inner surface portion 16 of the packaging box 1. 26 subdivided. The outer flaps 23 and 24 protrude from both sides of the long panel 21 in the longitudinal direction Dy, and the inner flaps 25 and 26 protrude from both sides of the short panel 22 in the longitudinal direction Dy.

In this embodiment, one long panel 21, one short panel 22, the other long panel 21, and the other short panel 22 are arranged from one side of the horizontal direction Dx to the other side (from left to right in FIG. 6). The sheet materials 2 arranged in this order are exemplified. A bonding piece 27 is connected to one long panel 21 for connecting one long panel 21 to the other short panel 22 when the sheet material 2 is assembled into the packaging box 1 . The bonding piece 27 protrudes from one long panel 21 toward one side in the horizontal direction Dx (direction away from one short panel 22).

In the sheet material 2, corrugator creases 4 forming boundaries between the panels 21, 22 and the flaps 23-26 extend along the lateral direction Dx. Further, the sheet material 2 is provided with a vertical ruled line 9 forming a boundary between the panels 21 and 22 and the bonding piece 27 along the vertical direction Dy. The vertical creases 9 are creases (grooves) similar to the corrugator creases 4 and guide the folding when the sheet material 2 is assembled into the packaging box 1 . However, in the sheet material 2 assembled into the A type box, the corrugator creases 4 are worked harder (deeper) than the vertical creases 9 .
The sheet material 2 is assembled so that the surfaces processed with the corrugator creases 4 and the vertical creases 9 are inside (inner surface) of the packaging box 1 . That is, both the corrugator creases 4 and the vertical creases 9 are processed for inward folding.

The slit 6 is cut in a convex shape from the corrugator ruled line 4 toward at least one side in the vertical direction Dy. Here, the parenthesis-shaped slits 6 projecting outward in the longitudinal direction Dy from the corrugator ruled lines 4 in the outer flaps 23 and 24 are exemplified. Thus, the slits 6 of this embodiment are provided in the outer flaps 23 and 24 and not provided in the panels 21 and 22 .

[2. Action and effect]
(1) Since the packaging box 1 is provided with a slit 6 which is cut in a convex shape from the ridge line 5 of the corner 3 formed by the two surfaces, the convex portion 8 surrounded by the slit 6 and the ridge line 5 can swing freely. Become. As a result, as shown in FIG. 7 , when a tightening force acts on the packaging box 1 from the band 7 wound around the slit 6 , the projection 8 on either one of the two surfaces forming the corner 3 overlaps other parts. Therefore, the corner portion 3 can be reliably folded obliquely (obtuse angle). In the packaging box 1 of the present embodiment, the convex portion 8 surrounded by the upper slit 61 and the upper ridgeline 51 overlaps other portions of the top surface portion 13, so that the upper corner portion 31 is obliquely bent. Although FIG. 7 illustrates the upper corner 31 of the packaging box 1, the lower corner 32 is similar to this (vertical symmetry).

In this manner, the swingable convex portion 8 overlaps the other portion to form an inclined surface at the corner portion 3 , so that the band 7 can be prevented from biting into the corner portion 3 . Therefore, breakage of the corner portion 3 due to biting of the band 7 can be suppressed more reliably. In addition, in FIG. 7, each of the two edges separated by the upper slit 61 is denoted by reference numeral "61(6)".

(2) Generally, in the A-type box, corrugator creases 4 forming boundaries between panels 21 and 22 and flaps 23 to 26 in the unfolded state form deeper grooves than other creases. It is difficult to break the part. On the other hand, since the slit 6 is provided in the packaging box 1, even if the ridge line 5 of the corner 3 formed by the long surface portion 11 and the horizontal surface portions 13 and 14 overlaps the corrugator ruled line 4, the slit is formed as described above. The corner portion 3 can be reliably folded obliquely by overlapping the convex portion 8 surrounded by the ridge 6 and the ridge line 5 with other portions. Therefore, even in the A-type packaging box 1, damage to the corners 3 due to the biting of the band 7 can be more reliably suppressed.

(3) An upper slit 61 cut in a convex shape from the upper ridge line 51 in either one of the long surface portion 11 or the top surface portion 13, and a convex shape from the lower ridge line 52 in either one of the long surface portion 11 or the bottom surface portion 14 If the lower slit 62 is provided, both the upper corner portion 31 and the lower corner portion 32 can be reliably folded obliquely. Therefore, both the upper corner portion 31 and the lower corner portion 32 can be more reliably prevented from being damaged due to biting of the band 7 .

(4) When the slits 6 are provided in the vertical surface portions 11 and 12, there is a possibility that the compressive strength of the packaging box 1 in the depth direction D1 may be lowered. On the other hand, if the slits 6 are provided on the horizontal surface portions 13 and 14 but not on the vertical surface portions 11 and 12, the depth of the packaging box 1 can be reduced while suppressing the breakage of the corner portions 3 due to the bite of the band 7. Compressive strength in the direction D1 can be maintained. Therefore, the deterioration of the reliability of the packaging box 1 can be prevented.

(5) As shown in FIG. 3, according to the slit 6 that is cut in a parenthesized shape protruding from the ridge line 5, the entire slit 6 forms a curve, which makes it easier to avoid stress concentration. As a result, damage to the corner portion 3 due to biting of the band 7 can be further suppressed.

(6) As shown in FIG. 4, according to the slit 6 cut in a hexagonal bracket shape projecting from the edge line 5, the size of the projection 8 surrounded by the slit 6 and the edge line 5 is adjusted to the extending direction of the edge line 5. (in this embodiment, it becomes easy to ensure over length direction D2). As a result, damage to the corner portion 3 due to biting of the band 7 can be more reliably suppressed along the extending direction of the ridgeline 5 .

(7) As shown in FIG. 5, according to the wavy slit 6, one of the two surface portions forming the corner portion 3 can be formed into a parenthesis-shaped main portion 6e that protrudes from the ridgeline 5. In addition, a pair of bracket-shaped auxiliary portions 6f projecting from the edge line 5 are provided on either one of the two surface portions. Therefore, the main protrusion 8a surrounded by the main portion 6e and the ridgeline 6f overlaps with other portions, so that the corner portion 3 can be reliably folded obliquely, and the pair of auxiliary portions 6f prevent the band 7 from being tightened. By dispersing the force, stress concentration at both ends of the main portion 6e can be alleviated. Therefore, damage to the corner portion 3 due to biting of the band 7 can be further suppressed.

[3. Modification]
The arrangement of the slits 6 described above is an example. The slit 6 may be cut in a convex shape from a ridgeline extending on the boundary line between the two sides forming the corner in the packaging box 1. For example, the slit 6 may be cut on the boundary line between the long side 11 and the short side 12 forming the corner. It may be cut convexly from the extending ridgeline. That is, the slit 6 is not limited to the ridgeline extending in the horizontal direction in the packaging box 1, and may be cut in a convex shape from the ridgeline extending in the depth direction D1. In any case, according to the packaging box 1 provided with the slit 6, it is possible to more reliably suppress damage to the corners due to biting of the band 7 wrapped around the outside of the slit 6 as described above.

The slit 6 may be provided on the long surface portion 11 and not provided on the top surface portion 13 and the bottom surface portion 14 . Alternatively, like the wave-shaped slit 6 illustrated in FIG.

The packaging box 1 may be formed of a sheet material other than a cardboard sheet. Moreover, the packaging box 1 is not limited to the A type box as described above. As shown in FIG. 8, the packaging box 1 is formed of a main body sheet piece 2A assembled with a tray-shaped (bottomed square cylinder) main body, and a lid body sheet piece 2B assembled with a lid covering the main body. may In the modification shown in FIG. 8, both the body sheet piece 2A and the lid sheet piece 2B are cardboard sheets.

The main body sheet piece 2A is composed of a rectangular bottom panel 44 that becomes a bottom surface (horizontal surface) when assembled into the main body, and four rectangular side panels 41 that become side surfaces (vertical surface) when assembled. 42. The side panels 41 and 42 are subdivided into a pair of first side panels 41 facing each other in the assembled state and a pair of second side panels 42 facing each other in the assembled state and arranged at right angles to the first side panels 41. be done.

In the assembled state, the side panels 41 and 42 are folded up from the bottom panel 44 so that the bottom panel 44 and the side panels 41 and 42 form corners (lower corners). Therefore, the boundary line 45 between the bottom panel 44 and the side panels 41 and 42 becomes a ridgeline (lower ridgeline) in the assembled state. In this modified example, the bottom panel 44 is provided with slits 6 (lower slits 62 ) that are protrudingly cut from the boundaries 45 between the bottom panel 44 and the first side panels 41 .

The lid sheet piece 2B consists of a rectangular top panel 43 that becomes the top surface (horizontal surface) in the assembled state of the lid, and a pair of rectangular overlapping panels that become the side surfaces (vertical surface) in the assembled state. 46. In the assembled state, the overlapped panel 46 is folded down from the top panel 43 so that the top panel 43 and each overlapped panel 46 form a corner (upper corner). Therefore, a boundary line 47 between the top panel 43 and each overlapped panel 46 becomes a ridgeline (upper ridgeline) in the assembled state. In this modification, the top panel 43 is provided with slits 6 (upper slits 61 ) protruding from the boundaries 47 between the top panel 43 and overlapping panels 46 .

In the packaging box formed by the body sheet piece 2A and the lid sheet piece 2B of this modification, the top panel 43 is arranged above the side panels 41 and 42 so as to face the bottom panel 44, and the pair of overlapping panels 46 are superimposed on the outside of the pair of first side panels 41 . Since the slit 6 is provided in such a packaging box as well, when a tightening force is applied from the band wound around the slit 6, the corners are reliably oblique ( obtuse angle). Therefore, breakage of the corners due to biting of the band 7 can be suppressed more reliably. In addition, according to the packaging box of this modified example, the same action and effect can be obtained from the configuration similar to that of the above-described embodiment.

1 Packaging box 2 Sheet material 2A Main body sheet piece 2B Lid sheet piece 3 Corner 4 Corrugator ruled line 5 Ridge line 6 Slit 6a Both ends 6b Intermediate portion 6c Parallel portion 6d Slanted portion 6e Main portion 6f Auxiliary portion 7 Band 8 Convex portion 8a Main Convex portion 8b Auxiliary convex portion 9 Vertical ruled line 11 Long surface portion (vertical surface portion)
12 short face (vertical face)
13 top surface (horizontal surface)
14 Bottom part (horizontal part)
15 top inner surface 16 bottom inner surface 21 long panel (panel)
22 short panel (panel)
23, 24 outer flap (flap)
25, 26 inner flap (flap)
27 Laminated piece 31 Upper corner 32 Lower corner 41 First side panel 42 Second side panel 43 Top panel 44 Bottom panel 45 Boundary line 46 Overlapping panel 47 Boundary line 51 Upper ridge line 52 Lower ridge line 61 Upper slit 62 Bottom Side slit D1 depth direction (vertical direction)
D2 length direction (horizontal direction)
D3 width direction (horizontal direction)
Dx Horizontal direction Dy Vertical direction

Claims (5)

A packaging box that forms a corner by bending two surfaces connected to each other along a boundary line,
a ridgeline extending on the boundary line at the corner;
and a slit protruding from the ridge line on either one of the two surface portions. Four panels are arranged in the horizontal direction in a state of being unfolded in a plane, and flaps are protruding from both sides of the panels in the vertical direction. A box of type A extending along
The two surface portions are a vertical surface portion arranged along the vertical direction and formed by the panel, and a horizontal surface portion arranged along the horizontal direction and formed by the flap,
The packaging box according to claim 1, wherein the ridge line overlaps with the corrugator ruled line. The two surface portions are a vertical surface portion arranged along the vertical direction and a horizontal surface portion arranged along the horizontal direction,
The horizontal surface portion includes a top surface portion connected to the upper edge of the vertical surface portion and a bottom surface portion connected to the lower edge of the vertical surface portion,
The ridgeline includes an upper ridgeline extending on the boundary line between the vertical surface portion and the top surface portion, and a lower ridgeline extending on the boundary line between the vertical surface portion and the bottom surface portion,
The slit includes an upper slit that is cut in a convex shape from the upper ridgeline in either one of the vertical surface portion and the top surface portion, and a convex shape that is incised from the lower ridgeline in either one of the vertical surface portion and the bottom surface portion. 3. A packaging box according to claim 1 or 2, comprising a lower slit cut into the . The two surface portions are a vertical surface portion arranged along the vertical direction and a horizontal surface portion arranged along the horizontal direction,
The packaging box according to any one of claims 1 to 3, wherein the slit is provided on the horizontal surface portion and not provided on the vertical surface portion. 5. The packaging box according to any one of claims 1 to 4, wherein the slit is cut in either one of the two surface portions in a round bracket shape protruding from the ridge line.

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