Packaging box with tamper-proof opening trace function

Abstract

To provide a packaging box with alteration prevention unpacking trace function which makes it possible to confirm a trace of unpacking on the way of physical distribution from the appearance of a corrugated cardboard box, and which can be stacked stably.SOLUTION: A packaging box 101A with alteration prevention unpacking trace function is made of one piece of a corrugated cardboard sheet, and a body part includes upper flaps 4 continuously provided at an upper end edge of a left surface side plate 2c and an upper end edge of a right surface side plate 2d respectively via a folding ruled line, and extending above an opening. A lid plate 3 has an insertion piece 5, and the insertion piece has first lock pieces 6. The packaging box with alteration prevention unpacking trace function has a lock mechanism in which, when the insertion piece is inserted between a front surface side plate and the upper flaps in a state where the first lock pieces are folded to the inside of the insertion piece, the first lock pieces are locked to a lower surface of the upper flaps.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a packaging box with tamper-evident opening evidence features. [Background technology]

[0002] Packaging design for cardboard boxes and other products is carried out as part of logistics services. Packaging design often takes into consideration the protection of the contents and the prevention of overpackaging.

[0003] For example, when IT equipment is packed in a cardboard box for transportation, it is difficult to check from the outside whether the data or switch settings have been tampered with or changed and have arrived at the destination with the default settings. If equipment is connected to a system on the assumption that the default settings are used, there is a risk of data errors, viruses, or malfunctions if the settings are tampered with. If the system is connected to a network, the damage can be widespread.

[0004] As a cardboard box having a tamper-proof function, for example, a cardboard box that can be locked without using adhesive tape and cannot be opened after being locked has been proposed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2013-184720 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the cardboard box of Patent Document 1, the leading edge flap is folded over onto the lid plate, which creates a step on the top surface of the cardboard box. Such a step on the top surface can cause the cardboard boxes to become unstable when stacked. For this reason, it is preferable that the top surface of the cardboard box is flat.

[0007] The present disclosure aims to provide a packaging box with a tamper-proof and opening trace function that allows traces of opening during logistics to be confirmed from the appearance of the cardboard box and that can be stacked stably. [Means for solving the problem]

[0008] The packaging box with tamper-evident and opening trace function according to the present invention is made of one cardboard sheet and has a bottom plate having four edges, a front side plate, a rear side plate, a left side plate, and a right side plate standing upright from the edges of the bottom plate, and has a main body with an open top, and a lid plate connected to the upper edge of the rear side plate via fold lines and closing the opening, wherein the main body has upper flaps connected to the upper edges of the left side plate and the right side plate via fold lines, respectively, and extending above the opening, and the lid plate is a flaps that is connected to the upper edges of the left side plate and the right side plate via fold lines, respectively, and extends above the opening, the packaging box has an insertion piece connected to a first edge opposite to an edge of the front side panel via a fold line, the insertion piece having the first edge, a second edge opposite to the first edge, and a third edge and a fourth edge connecting the first edge and the second edge, and a first locking piece connected to the third edge and the fourth edge via fold lines, respectively, and the packaging box with tamper-proof and opening trace function has a locking mechanism in which the first locking piece is engaged with the underside of the upper flap when the insertion piece is inserted between the front side panel and the upper flap in a state where the first locking piece is folded inside the insertion piece. The insertion piece further includes a second locking piece that is connected to an edge of the first locking piece that abuts against the third edge or the fourth edge via a fold line and extends to the adjacent side of the cover plate, and the locking mechanism is configured such that when the second locking piece is folded inside the first locking piece and the overlapped second locking piece and the first locking piece are folded inside the insertion piece and the insertion piece is inserted between the front side plate and the top flap, the first locking piece is engaged with the lower surface of the top flap and the second locking piece is aligned with the lower surface of the top flap. It is characterized by: The packaging box with tamper-evident and opening trace function according to the present invention is made of a single cardboard sheet and has a bottom plate having four edges, a front side plate, a rear side plate, a left side plate, and a right side plate standing up from the edges of the bottom plate, and has a main body with an open top, and a lid plate connected to the upper edge of the rear side plate via fold lines and closing the opening, wherein the main body has upper flaps connected to the upper edges of the left side plate and the right side plate via fold lines, respectively, and extending above the opening, and the lid plate has an insertion piece connected to a first edge opposite the edge of the rear side plate via a fold line, and the insertion piece is configured to be in a shape that is in contact with the first edge and a shape that is in contact with the first edge. the packaging box with tamper-proof opening trace function has a second edge facing the front side panel, and a third edge and a fourth edge connecting the first edge and the second edge, and a first locking piece connected to the third edge and the fourth edge via fold lines, and the packaging box with tamper-proof opening trace function has a locking mechanism in which the first locking piece engages with the underside of the upper flap when the first locking piece is folded inside the insertion piece and the insertion piece is inserted between the front side panel and the upper flap, the left side panel and the right side panel each have a weak portion for forming a horizontal hole on an upper portion of the front side panel, and a horizontal hole formed by breaking the weak portion for forming the horizontal hole is a hole for inserting a finger to release the locking mechanism.

[0009] In the packaging box with tamper-proof opening trace function of the present invention, it is preferable that the insertion piece further has a second locking piece that is connected to the edge of the first locking piece that abuts the third edge or the fourth edge via a fold line and extends to the adjacent side of the cover plate, and the locking mechanism is configured such that when the second locking piece is folded inside the first locking piece and the overlapping second locking piece and the first locking piece are folded inside the insertion piece and the insertion piece is inserted between the front side panel and the top flap, the first locking piece is engaged with the underside of the top flap and the second locking piece is parallel to the underside of the top flap.

[0010] In the packaging box with tamper-proof opening evidence function of the present invention, it is preferable that the insertion piece has a locking hole that locks the second locking piece when the second locking piece moves toward the insertion piece.

[0011] The packaging box with a tamper-proof opening trace function according to the present invention preferably has a fragile portion for opening at least on the cover plate.

[0012] In the packaging box with tamper-proof opening trace function of the present invention, the left side panel and the right side panel each have a weak portion for forming a horizontal hole at the upper part of the front side panel, and it is preferable that the horizontal hole formed by breaking the weak portion for forming the horizontal hole is a hole for inserting a finger to release the locking mechanism.

[0013] In the packaging box with tamper-evident and opening evidence function according to the present invention, it is preferable that the cover plate has a tab portion protruding from the first edge.

[0014] In the packaging box with tamper-proof opening trace function of the present invention, the upper edge of the left side panel and the upper edge of the right side panel have a first area in which the upper flap is provided and a second area closer to the front side panel than the first area, and it is preferable that the height of the second area from the bottom plate is greater than the height of the first area from the bottom plate. Effect of the Invention

[0015] According to the present disclosure, it is possible to provide a packaging box with a tamper-proof opening trace function that allows traces of opening during logistics to be confirmed from the appearance of the cardboard box and can be stacked stably. [Brief description of the drawings]

[0016] [Figure 1] 1 is an oblique view showing a state in which the cover plate of the packaging box with tamper-proof opening trace function according to the first embodiment is open. FIG. [Diagram 2] 1 is a development view of a blank sheet of a packaging box with a tamper-proof opening trace function according to a first embodiment. FIG. [Diagram 3] FIG. 2 is a partially enlarged view of part A in FIG. [Figure 4] FIG. 3 is a partial enlarged view of part B in FIG. 2. [Diagram 5] FIG. 3 is a partial enlarged view of part C in FIG. 2. [Figure 6] 1A to 1C are diagrams for explaining the assembly process of the packaging box with tamper-proof opening trace function according to the first embodiment. [Figure 7] 13 is a development view of a blank sheet of a packaging box with a tamper-proof opening trace function according to a second embodiment. FIG. [Figure 8] FIG. 8 is a partial enlarged view of portion D in FIG. [Figure 9] 13A to 13C are diagrams for explaining the assembly process of a packaging box with a tamper-proof opening trace function according to a second embodiment. [Figure 10] 13 is a development view of a blank sheet of a packaging box with a tamper-proof opening trace function according to a third embodiment. FIG. [Figure 11] 13A to 13C are diagrams for explaining the assembly process of a packaging box with a tamper-proof opening trace function according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Next, the present invention will be described in detail with reference to the embodiments, but the present invention is not limited to these descriptions. Various modifications of the embodiments may be made as long as the effects of the present invention are achieved.

[0018] First embodiment FIG. 1 is a perspective view showing a state where a cover plate of a packaging box with tamper-proof and opening trace function according to the first embodiment is opened. FIG. 2 is a development view of a blank sheet of the packaging box with tamper-proof and opening trace function according to the first embodiment. The packaging box with tamper-proof and opening trace function 101A according to the first embodiment shown in FIG. 1 is assembled, for example, as shown in FIG. 2 using one cardboard sheet as a blank sheet 100A. Next, the packaging box with tamper-proof and opening trace function 101A according to the first embodiment will be described with reference to the perspective view of FIG. 1 and the development view of the blank sheet 100A of FIG. A packaging box 101A (shown in FIG. 1) with a tamper-proof and opening trace function according to the first embodiment is made of a single cardboard sheet as shown in FIG. 2, and has a bottom plate 1 having four edges 50a, 50b, 50c, and 50d, a front side plate 2a, a rear side plate 2b, a left side plate 2c, and a right side plate 2d that stand up from the edges 50a, 50b, 50c, and 50d of the bottom plate 1, a main body portion with an open top, and a cover plate 3 that is connected to an upper edge 50e of the rear side plate 2b via a fold line and closes the opening. In the packaging box with a tamper-proof and opening trace function, the main body portion is connected to an upper edge 50m of the left side plate 2c and an upper edge 50n of the right side plate 2d via fold lines and extends above the opening. and a top flap 4 that is folded over from the front side panel 2a and the top flap 4, the cover plate 3 having an insertion piece 5 connected via a fold line to a first edge 50f opposite the edge 50e on the rear side panel 2b side, the insertion piece 5 having the first edge 50f, a second edge 51 facing the first edge 50f, and a third edge 53 and a fourth edge 54 connecting the first edge 50f and the second edge 51, and a first locking piece 6 connected to the third edge 53 and the fourth edge 54 via fold lines 50g and 50h, respectively. The packaging box with tamper-proof and opening trace function has a locking mechanism in which the first locking piece 6 is engaged with the underside of the top flap 4 when the insertion piece 5 is inserted between the front side panel 2a and the top flap 4 with the first locking piece 6 folded inside the insertion piece 5.

[0019] 1, the packaging box 101A with tamper-proof and opening evidence function can have an opening on the top surface covered with a cover plate 3. When the cover plate 3 is closed, the packaging box 101A with tamper-proof and opening evidence function has a rectangular parallelepiped shape, and the internal space of the rectangular parallelepiped becomes the storage chamber 20.

[0020] In the blank sheet 100A, as shown in FIG. 2, it is preferable that the insert piece 5, the cover plate 3, the rear side plate 2b, the bottom plate 1, and the front side plate 2a are connected in series via fold lines 50f, 50e, 50b, and 50a along the grain direction of the cardboard sheet. It is preferable that the front side plate 2a has an upper end plate 9 and a folded side plate 10 connected in series via fold lines 50o and 50p. The first lock piece 6 is connected to both sides of the insert piece 5 via fold lines 50g and 50h. The left side plate 2c and the right side plate 2d are connected to both sides of the bottom plate 1 via fold lines 50c and 50d, respectively. The upper flap 4 is connected to the left side plate 2c and the right side plate 2d via fold lines 50m and 50n. The left side panel 2c and the right side panel 2d have rear side flaps 7a, 7b respectively extending through fold lines 50i, 50j in a direction adjacent to the rear side panel 2b, and front side flaps 8a, 8b respectively extending through fold lines 50k, 50l in a direction adjacent to the front side panel 2a. The rear side flaps 7a, 7b have engaging portions 7a1, 7b1 which can engage with each other. The bottom panel 1 has an engagement hole 11, and the folded side panel 10 has a protrusion 12 on an edge 52 opposite the fold line 50p. When the folded side panel 10 is folded back toward the storage chamber 20 and faces the front side panel 2a, the protrusion 12 can be engaged with the engagement hole 11. The upper end panel 9 is a surface formed by valley folding two parallel fold lines 50o, 50p when the folded side panel 10 is folded back toward the storage chamber 20 to face the front side panel 2a, and forms the upper end surface of the front side panel 2a. The width of the upper end panel 9 is the distance between the center lines of the fold lines 50o, 50p, and is preferably, for example, 11 mm to 13 mm. Here, the edges and the fold lines are aligned, so they are all given the same reference numerals 50 (50a to 50p).

[0021] 5 is a partial enlarged view of part C in FIG. 2. The first lock piece 6 is provided on a part of the third edge 53 and the fourth edge 54 on the second edge 51 side. That is, the third edge 53 and the fourth edge 54 have a part where the first lock piece 6 is provided (a part where the fold lines 50g, 50h are provided) and a part where the first lock piece 6 is not provided. The length of the part of the third edge 53 and the fourth edge 54 where the first lock piece 6 is not provided, in other words, the distance H3 between the edge 55a, 55b abutting the third edge 53 or the fourth edge 54 and the first edge 50f, is preferably one thickness of a cardboard sheet or more and five thicknesses of a cardboard sheet or less, more preferably two thicknesses of a cardboard sheet or more and four thicknesses of a cardboard sheet or less. When the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4 with the first locking piece 6 folded inside the insertion piece 5, the first locking piece 6 can be locked to the upper flap 4 without being caught by the upper flap 4.

[0022] The length H4 of the first locking piece 6 is not particularly limited, but is preferably long enough to be engaged with the top flap 4 and not come off due to impact, for example, 40 mm. Here, the length H4 of the first locking piece 6 is the distance between the fold line 50g provided on the third edge 53 and the edge 56a facing the fold line 50g, or the distance between the fold line 50h provided on the fourth edge 54 and the edge 56b facing the fold line 50h, as shown in FIG.

[0023] In the packaging box 101A with tamper-proof opening trace function according to the first embodiment, the left side panel 2c and the right side panel 2d each have a fragile portion 14 for forming a horizontal hole at the upper portion on the front side panel 2a side, and it is preferable that the horizontal hole formed by breaking the fragile portion 14 for forming the horizontal hole is a hole for inserting a finger to release the locking mechanism.

[0024] The horizontal hole forming weak portion 14 may be an area surrounded by a weakened line 14a such as a perforation or half-cut line and a fold line 14b as shown in FIG. 2, or may be an area surrounded only by a weakened line such as a perforation or half-cut line (not shown). The shape of the horizontal hole formed by breaking the horizontal hole forming weak portion 14 is not particularly limited as long as it can be inserted with a finger to release the locking mechanism, and is, for example, a rectangular or long hole shape. The shape of the horizontal hole formed by breaking the horizontal hole forming weak portion 14 preferably has a notch 14c at the bottom on the front side panel 2a side. When the horizontal hole is pushed in to move the first locking piece 6 toward the insertion piece 5, the presence of the notch 14c can prevent the horizontal hole from getting caught by the first locking piece 6.

[0025] In the packaging box 101A with tamper-proof opening trace function according to the first embodiment, the cover plate 3 preferably has a tab 13 protruding from the first edge 50f. The tab 13 is used as a tab when opening the box. As shown in FIG. 2, a convex cut is made from the fold line 50f at the boundary between the cover plate 3 and the insertion piece 5 toward the insertion piece 5, and the cut portion becomes the tab 13 by folding the fold line 50f as shown in FIG. 1. The amount of protrusion of the tab 13 from the fold line 50f is preferably the width of the upper end panel 9 plus 3 to 4 mm.

[0026] In the blank sheet 100A shown in Fig. 2, by making valley folds along the fold lines 50 (50a to 50p), a box 101A can be formed as shown in Fig. 6. Next, the assembly process of the packaging box 101A with tamper-proof and opening trace function according to the first embodiment will be described with reference to Fig. 6.

[0027] First, as shown in FIG. 6(a), one blank sheet 100A is spread out. Next, as shown in FIG. 6(b), the left side plate 2c and the right side plate 2d are raised, and the rear side flaps 7a and 7b are folded inward to engage the engagement parts 7a1 and 7b1 with each other as shown in FIG. 6(c). Also, the front side flaps 8a and 8b are folded inward to engage the engagement parts 8a1 and 8b1 with each other as shown in FIG. 6(d). Next, as shown in FIG. 6(e), the front side plate 2a is raised, and the folded side plate 10 is folded inward to face the front side plate 2a. At this time, the protrusion 12 (shown in FIG. 2) is engaged with the engagement hole 11 (shown in FIG. 2), and the folded side plate 10 is fixed in a state of facing the front side plate 2a. Also, the upper flap 4 is folded inward. Next, the rear side plate 2b is raised as shown in FIG. 6(f). Next, the first locking piece 6 is folded inside the insertion piece 5 as shown by the arrow in Fig. 6(f), and with the first locking piece 6 folded, the insertion piece 5 is inserted between the front side panel 2a and the upper flap 4 as shown in Fig. 6(g), forming a rectangular parallelepiped packaging box 101A with tamper-proof and opening trace function as shown in Fig. 6(h). The top surface of the box 101A is made up of the cover plate 3 and the top end panel 9, both of which are on the same plane, so there is no step on the top surface. In addition, the bottom surface of the box 101A is made up of the bottom plate 1, so there is no step on the bottom surface either. For this reason, the boxes 101A can be stacked stably.

[0028] The locking mechanism of the packaging box 101A with tamper-proof opening trace function according to the first embodiment will be described. When the insert piece 5 is inserted between the front side plate 2a and the top flap 4 and the entire first lock piece 6 moves below the top flap 4, the first lock piece 6 is opened from its folded state by the elastic force of the cardboard sheet, and the first lock piece 6 rotates toward the left side plate 2c or the right side plate 2d around the fold lines 50g, 50h (shown in FIG. 2). Since the top flap 4 is located above the first lock piece 6, if the cover plate 3 is lifted upward to open the box 101A, the first lock piece 6 is caught by the underside of the top flap 4 and cannot be opened. If the cover plate 3 is moved further upward to forcibly open the box 101A, the first lock piece 6 breaks, leaving an opening trace. When opening box 101A without breaking first lock piece 6, horizontal hole forming weak part 14 is pushed into box 101A and broken to form a horizontal hole, and then index finger, for example, is inserted through the horizontal hole to fold first lock piece 6 inside insertion piece 5, and thumb, for example, is hooked on knob 13 to move cover plate 3 upward, whereby insertion piece 5 and first lock piece 6 can be removed from between front side plate 2a and upper flap 4, and box 101A is opened. At this time, the broken horizontal hole forming weak part 14 allows the traces of opening to be confirmed.

[0029] Second Embodiment 7 to 9, a packaging box 101B with a tamper-proof and opening evidence function according to the second embodiment has the same basic configuration as the packaging box 101A with a tamper-proof and opening evidence function according to the first embodiment, except that the locking mechanism further includes a second locking piece 15 in addition to the first locking piece 6, and that the packaging box 101B with a tamper-proof and opening evidence function according to the first embodiment includes a weak portion 17 for opening instead of the weak portion 14 for forming a horizontal hole. Therefore, a description of the common configuration will be omitted, and only different configurations will be described.

[0030] In the packaging box 101B with tamper-proof opening trace function according to the second embodiment, the insertion piece 5 is connected to edges 55a, 55b of the first locking piece 6 that abut the third edge 53 or the fourth edge 54 via fold lines 50q, 50r, and further has a second locking piece 15 extending adjacent to the cover plate 3, and the locking mechanism is preferably configured such that when the second locking piece 15 is folded inside the first locking piece 6 and the overlapped second locking piece 15 and first locking piece 6 are folded inside the insertion piece 5 and the insertion piece 5 is inserted between the front side panel 2a and the top flap 4, the first locking piece 6 is engaged with the underside of the top flap 4 and the second locking piece 15 is parallel to the underside of the top flap 4.

[0031] Fig. 8 is a partial enlarged view of part D in Fig. 7. The second lock piece 15 is preferably provided on a part of the edge 56a, 56b facing the fold lines 50g, 50h, among the edge 55a, 55b abutting the third edge 53 or the fourth edge 54. In other words, the edge 55a, 55b preferably has a part where the second lock piece 15 is provided (a part where the fold lines 50q, 50r are provided) and a part where the second lock piece 15 is not provided. If the second locking piece 15 is provided over the entire edges 55a, 55b that abut against the third edge 53 or the fourth edge 54, the overlapping second locking piece 15 and first locking piece 6 will become bulky and may be difficult to fold inside the insertion piece 5, but by providing the second locking piece 15 on a part of the edges 55a, 55b that abut against the third edge 53 or the fourth edge 54, it becomes easier to fold the overlapping second locking piece 15 and first locking piece 6 inside the insertion piece 5. The length H4 of the portion of the edges 55a, 55b where the second locking piece 15 is not provided is preferably 13 mm or more and 15 mm or less.

[0032] The packaging box 101B with tamper-proof opening trace function according to the second embodiment preferably has a weak portion 17 for opening at least on the cover plate 3 as shown in Fig. 7. The weak portion 17 for opening is, for example, a planned breaking line processed by perforation or half-cutting. The weak portion 17 for opening is preferably formed across from the cover plate 3 to the rear side plate 2b as shown in Fig. 7.

[0033] In the packaging box 101B with a tamper-proof opening trace function according to the second embodiment, the insertion piece 5 preferably has a locking hole 16 that locks the second locking piece 15 when the second locking piece 15 moves toward the insertion piece 5. By locking the second locking piece 15 in the locking hole 16, it is possible to prevent the first locking piece 6 from being unintentionally folded inside the insertion piece 5. This makes it possible to more reliably prevent unauthorized opening.

[0034] In the blank sheet 100B shown in Fig. 7, by making valley folds along the fold lines 50 (50a to 50r), a box 101B can be formed as shown in Fig. 9. Next, an assembly process of the packaging box 101B with tamper-proof and opening trace function according to the second embodiment will be described with reference to Fig. 9.

[0035] 9(a)-(e) are the same as those in FIG. 6(a)-(e), so the explanation will be omitted, and FIG. 9(f)-FIG. 9(i) will be explained. As shown in FIG. 9(f), the rear side plate 2b is raised, and the second lock piece 15 is folded inside the first lock piece 6 as shown by the arrow in FIG. 9(f). Next, the overlapped second lock piece 15 and the first lock piece 6 are folded inside the insertion piece 5 as shown by the arrow in FIG. 9(g). Then, as shown in FIG. 9(h), the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4 in a state where the second lock piece 15 and the first lock piece 6 are folded inside the insertion piece 5, and a rectangular parallelepiped packaging box 101B with tamper-proof and opening trace function is formed as shown in FIG. 9(i).

[0036] The locking mechanism of the packaging box 101B with tamper-proof and opening trace function according to the second embodiment will be described. When the insert piece 5 is inserted between the front side plate 2a and the top flap 4 and the second lock piece 15 and the first lock piece 6 move downward from the top flap 4, the second lock piece 15 and the first lock piece 6 are opened by the elasticity of the cardboard sheet, and the first lock piece 6 rotates toward the left side plate 2c or the right side plate 2d about the fold lines 50g, 50h (shown in FIG. 2) and the second lock piece 15 is aligned with the bottom surface of the top flap 4. Since the top flap 4 is above the second lock piece 15 and the first lock piece 6, when the cover plate 3 is lifted upward to open the box 101A, the second lock piece 15 and the first lock piece 6 are engaged with the bottom surface of the top flap 4 and cannot be opened. If the cover plate 3 is moved further upward to forcefully open the box 101A, the first locking piece 6 breaks, leaving traces of opening. If the box 101B is opened without breaking the first locking piece 6, the top of the box 101B is opened by breaking the fragile part for opening 17. At this time, the traces of opening can be confirmed by the fact that the fragile part for opening 17 has been broken.

[0037] The packaging box 101B with tamper-proof and opening trace function according to the second embodiment has the second locking piece 15, which can prevent the first locking piece 6 from being unintentionally folded inside the insertion piece 5. This makes it possible to more reliably prevent unauthorized opening.

[0038] The packaging box 101A with a tamper-proof and opening evidence function according to the first embodiment has a tab portion 13 used when opening, as shown in FIG. 1, whereas the packaging box 101B with a tamper-proof and opening evidence function according to the second embodiment is opened by breaking the fragile portion 17 for opening, so that the tab portion 13 is not necessary, although a tab portion 13 may be provided.

[0039] Third embodiment 10 and 11, a packaging box 101C with a tamper-proof and opening trace function according to the third embodiment has the same basic configuration as the packaging box 101B with a tamper-proof and opening trace function according to the second embodiment, except that the packaging box 101C has a horizontal hole-forming weak portion 18 instead of the opening weak portion 17. Therefore, a description of the common configuration will be omitted, and only the different configuration will be described.

[0040] The horizontal hole-forming weak portion 18 preferably has a first horizontal hole-forming portion 18a and a second horizontal hole-forming portion 18b. The first horizontal hole-forming portion 18a is a portion for breaking through the left side plate 2c and the right side plate 2d to form the first horizontal hole, and is, for example, an area surrounded by a weakened line such as a perforation or a half-cut line. The second horizontal hole-forming portion 18b may be an area surrounded by a weakened line such as a perforation or a half-cut line and a fold line, similar to the horizontal hole-forming weak portion 14 in the first embodiment shown in Fig. 2, or may be an area surrounded only by a weakened line such as a perforation or a half-cut line (not shown). In the first embodiment, the horizontal hole forming fragile portion 14 is pressed inward as a whole to form a horizontal hole, whereas in the third embodiment, the horizontal hole forming fragile portion 18 presses the first horizontal hole forming portion 18a inward to break through the left side panel 2c and the right side panel 2d to form a first horizontal hole, and then inserts a finger into the first horizontal hole to tear the second horizontal hole forming portion 18b outward to form a second horizontal hole.

[0041] In the blank sheet 100C shown in Fig. 10, by valley folding each of the fold lines 50 (50a to 50r), a box 101B can be formed as shown in Fig. 11. Next, the assembly process of the packaging box 101C with tamper-proof and opening trace function according to the third embodiment will be described with reference to Fig. 11.

[0042] The steps in FIG. 11(a) to (i) are the same as the steps in FIG. 9(a) to (i).

[0043] The locking mechanism of the packaging box 101C with tamper-proof and opening trace function according to the third embodiment will be described. When the insert piece 5 is inserted between the front side plate 2a and the top flap 4 and the second lock piece 15 and the first lock piece 6 move downward from the top flap 4, the second lock piece 15 and the first lock piece 6 are opened by the elasticity of the cardboard sheet, and the first lock piece 6 rotates toward the left side plate 2c or the right side plate 2d about the fold lines 50g, 50h (shown in FIG. 2) and the second lock piece 15 is aligned with the bottom surface of the top flap 4. Since the top flap 4 is located above the second lock piece 15 and the first lock piece 6, when the cover plate 3 is lifted upward to open the box 101A, the second lock piece 15 and the first lock piece 6 are engaged with the bottom surface of the top flap 4 and cannot be opened. If the cover plate 3 is moved further upward to forcefully open the box 101A, the first locking piece 6 will break, leaving traces of the box having been opened. In addition, when opening the box 101B without breaking the first lock piece 6, the first horizontal hole forming portion 18a of the horizontal hole forming weak portion 18 is pushed inward to break through the left side plate 2c and the right side plate 2d to form a first horizontal hole, a finger is inserted into the first horizontal hole to break the second horizontal hole forming portion 18b outward to form a second horizontal hole, and, for example, an index finger is inserted through the second horizontal hole to fold the second lock piece 15 inside the first lock piece 6, and the overlapped second lock piece 15 and first lock piece 6 are folded inside the insertion piece 5, and the cover plate 3 is moved upward, whereby the insertion piece 5, the first lock piece 6, and the second lock piece 15 can be removed from between the front side plate 2a and the upper flap 4, and the box 101C is opened. At this time, the fact that the horizontal hole forming weak portion 18 is broken allows the traces of opening to be confirmed.

[0044] The packaging box 101C with tamper-proof and opening trace function according to the third embodiment has the second locking piece 15, which can prevent the first locking piece 6 from being unintentionally folded inside the insertion piece 5. This makes it possible to more reliably prevent unauthorized opening.

[0045] In the packaging box 101C with tamper-proof and opening trace function according to the third embodiment, the cover plate 3 may have a tab portion 13 (shown in FIGS. 1 and 2) protruding from the first edge 50f.

[0046] Next, a preferred embodiment for more reliably preventing unauthorized opening of the boxes 101A, 101B, and 101C according to the first to third embodiments will be described.

[0047] FIG. 3 is a partial enlarged view of the A portion of FIG. 1. FIG. 4 is a partial enlarged view of the B portion of FIG. 2. In FIG. 3 and FIG. 4, the left side panel 2c side is shown as an example, but the right side panel 2d side has the same structure. In FIG. 3 and FIG. 4, the box 101A of the first embodiment is shown as an example, but the box 101B of the second embodiment and the box 101C of the third embodiment preferably have the same structure. The B portion of FIG. 4 shows the part that corresponds to the A portion of FIG. 3 on the blank sheet 100A. In the packaging boxes 101A, 101B, and 101C with tamper-proof and opening trace functions according to the first to third embodiments, the upper end edge 50m of the left side panel 2c and the upper end edge 50n of the right side panel 2d have a first region 21 in which the upper flap 4 is provided and a second region 22 that is closer to the front side panel 2a than the first region 21, and it is preferable that the height of the second region 22 from the bottom panel 1 is higher than the height of the first region 21 from the bottom panel 1. The amount of protrusion H1 of the second region 22 from the upper surface of the top flap 4 is preferably 1 to 5 mm, and more preferably 2 to 3 mm. In the first embodiment, the width H2 of the second region 22 is preferably the total thickness of the insertion piece 5 and the first locking piece 6, i.e., the thickness of two cardboard sheets. In the second and third embodiments, the width H2 of the second region 20 is preferably the total thickness of the insertion piece 5, the first locking piece 6, and the second locking piece 15, i.e., the thickness of three cardboard sheets.

[0048] As shown in Figs. 2, 7 and 8, the fold line 50m which is the boundary between the left side panel 2c and the top flap 4, and the fold line 50n which is the boundary between the right side panel 2d and the top flap 4 are preferably lead creases. A lead crease is a crease in which creases and cuts are alternately formed in a straight line. By making the fold lines 50m and 50n lead creases, the folding position of the top flap 4 can be more reliably on the fold lines 50m and 50n, and when the cover plate 3 is closed, the gap between the cover plate 3 and the top flap 4 can be made smaller. This makes it possible to prevent an attempt to release the locking mechanism by inserting a thin plate-like object through the gap between the cover plate 3 and the top flap 4 for the purpose of tampering. At this time, it is preferable that the direction of the fold lines 50m and 50n is the same as the grain direction of the cardboard sheet. The folding position of the top flap 4 is less likely to shift, and the gap between the cover plate 3 and the top flap 4 can be made smaller. This makes it possible to prevent any attempt to release the locking mechanism by inserting a thin plate-like object into the gap between the cover plate 3 and the upper flap 4 for the purpose of tampering.

[0049] As shown in Figs. 2, 7 and 8, the front side flaps 8a and 8b preferably have engaging portions 8a1 and 8b1 that can engage with each other. In a box in which the folded side plate 10 is folded back toward the storage chamber 20 to face the front side plate 2a, the front side flaps 8a and 8b are sandwiched and fixed between the front side plate 2a and the folded side plate 10, so that generally, the engaging function between the front side flaps 8a and 8b is not necessary. However, in this embodiment, by engaging the front side flaps 8a and 8b with each other, the left side plate 2c and the right side plate 2d are less likely to move in the left-right direction, so that the gap between the cover plate 3 and the upper flap 4 can be made smaller. This makes it possible to prevent an attempt to insert a thin plate-like object through the gap between the cover plate 3 and the upper flap 4 to release the locking mechanism for the purpose of tampering. [Explanation of symbols]

[0050] 1 Bottom plate 2a Front side plate 2b Rear side plate 2c Left side plate 2d Right side plate 3 Lid plate 4 Top flap 5 Insert 6 First lock piece 7a,7b Rear side flap 7a1,7b1 Engagement part 8a,8b Front side flaps 8a1,8b1 Engagement part 9 Top end face plate 10 Folded side panel 11. Engagement hole 12 Protrusion 13 Knob 14 Weak part for forming horizontal hole 14a Weakened Line 14b Fold line 14c Cutout 15 Second lock piece 16 Locking hole 17 Fragile part for opening 18 Weak part for forming horizontal hole 18a First horizontal hole forming part 18b 2nd horizontal hole forming part 20 Containment Room 21 First area 22 Second area 50(50a~50r) Fold line 51 Second Margin 52 Margin 53 Third Margin 54 Fourth Margin 55a,55b Edge 56a,56b Edge 101A, 101B, 101C Packaging box with tamper-proof opening trace function 100A, 100B, 100C Blank Sheet H1: Protrusion amount of the second area relative to the top surface of the upper flap H2 Width of the second area H3 Distance between the edge abutting the third or fourth edge and the first edge H4 Length of first lock piece

Claims

1. A packaging box with a tamper-proof and opening evidence function, comprising: a body portion having a bottom plate made of one cardboard sheet and having four edges; a front side plate, a rear side plate, a left side plate, and a right side plate extending from the edges of the bottom plate; the body portion having an opening at the top; and a cover plate connected to the upper edge of the rear side plate via a fold line to close the opening, The main body has an upper flap that is connected to the upper edge of the left side panel and the upper edge of the right side panel via a fold line and extends above the opening, The cover plate has an insertion piece connected to a first edge opposite to the edge of the rear side plate via a fold line, The insertion piece has the first edge, a second edge opposite the first edge, and a third edge and a fourth edge connecting the first edge and the second edge, and has a first lock piece connected to the third edge and the fourth edge via a fold line, The packaging box with tamper-proof and opening trace function has a locking mechanism in which, when the first locking piece is folded inside the insertion piece and the insertion piece is inserted between the front side panel and the top flap, the first locking piece is engaged with the underside of the top flap, The insertion piece further includes a second locking piece that is connected to an edge of the first locking piece that abuts the third edge or the fourth edge via a fold line and extends adjacent to the cover plate, a locking mechanism for locking the first locking piece against the upper flap and the second locking piece against the upper flap, the locking mechanism being configured such that when the second locking piece is folded inside the first locking piece and the overlapping second locking piece and the first locking piece are folded inside the insertion piece and the insertion piece is inserted between the front side panel and the upper flap, the first locking piece is engaged with the underside of the upper flap and the second locking piece is parallel to the underside of the upper flap.

2. A packaging box with a tamper-proof and opening evidence function, comprising: a body portion having a bottom plate made of one cardboard sheet and having four edges; a front side plate, a rear side plate, a left side plate, and a right side plate extending from the edges of the bottom plate; the body portion having an opening at the top; and a cover plate connected to the upper edge of the rear side plate via a fold line to close the opening, The main body has an upper flap that is connected to the upper edge of the left side panel and the upper edge of the right side panel via a fold line and extends above the opening, The cover plate has an insertion piece connected to a first edge opposite to the edge of the rear side plate via a fold line, The insertion piece has the first edge, a second edge opposite the first edge, and a third edge and a fourth edge connecting the first edge and the second edge, and has a first lock piece connected to the third edge and the fourth edge via a fold line, The packaging box with tamper-proof and opening trace function has a locking mechanism in which, when the first locking piece is folded inside the insertion piece and the insertion piece is inserted between the front side panel and the top flap, the first locking piece is engaged with the underside of the top flap, The left side plate and the right side plate each have a fragile portion for forming a horizontal hole at an upper portion of the front side plate, A packaging box with a tamper-proof and opening evidence function, characterized in that the horizontal hole formed by breaking the horizontal hole-forming weak portion is a hole for inserting a finger to release the locking mechanism.

3. The insertion piece further includes a second locking piece that is connected to an edge of the first locking piece that abuts the third edge or the fourth edge via a fold line and extends adjacent to the cover plate, 3. The packaging box with tamper-proof and opening evidence function according to claim 2, characterized in that, when the second locking piece is folded inside the first locking piece and the overlapping second locking piece and the first locking piece are folded inside the insertion piece and the insertion piece is inserted between the front side panel and the top flap in a state where the overlapping second locking piece and the first locking piece are folded inside the insertion piece, the first locking piece is engaged with the underside of the top flap and the second locking piece is parallel to the underside of the top flap.

4. The packaging box with a tamper-proof and opening evidence function according to claim 1 or 3, characterized in that the insertion piece has a locking hole that locks the second locking piece when the second locking piece moves toward the insertion piece.

5. 5. The packaging box with a tamper-evident and opening evidence function according to any one of claims 1 to 4, characterized in that at least the cover plate has a weak portion for opening.

6. The packaging box with a tamper-proof and opening evidence function according to claim 2 , wherein the cover plate has a tab portion protruding from the first edge.

7. an upper end edge of the left side panel and an upper end edge of the right side panel each have a first region in which the upper flap is provided and a second region closer to the front side panel than the first region; The packaging box with a tamper-proof and opening evidence function according to any one of claims 1 to 6, characterized in that the height of the second region from the bottom plate is greater than the height of the first region from the bottom plate.

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