Tamper-proof packaging box with tamper-evident opening trace feature

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 an anti-tampering unpacking trace function.

Background Art

[0002] As part of the logistics service, packaging designs such as cardboard boxes are carried out. In packaging design, protection of the contents or prevention of over-packaging are often considered.

[0003] For example, when packing and transporting IT equipment in a cardboard box, it was difficult to visually confirm from the appearance whether the data or switch settings had arrived at the destination without being tampered with or changed and remained in the initial settings. When connecting the device to the system on the premise that it is in the initial settings, if there is tampering, there is a risk of data errors, virus contamination, or malfunction. In the case of a system connected to a network, the damage will spread widely. <000A013>

[0004] As a cardboard box having an anti-tampering function, for example, a cardboard box that can be locked without using an adhesive tape and cannot be opened after locking has been proposed (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the cardboard box of Patent Document 1, since the front edge flap is folded on the cover plate, there is a step on the upper surface of the cardboard box. Such a step on the upper surface causes the stacking state to be unstable when stacking the cardboard boxes. Therefore, the upper surface of the cardboard box is preferably a flat surface.

[0007] The purpose of this disclosure is to provide a tamper-proof packaging box with an unpacking trace function that allows for the confirmation of unpacking traces during logistics from the appearance of the cardboard box and enables stable stacking. [Means for solving the problem]

[0008] The tamper-proof packaging box with an unpacking trace function according to the present invention comprises a main body made of a single corrugated cardboard sheet and having a bottom plate having four edges, a front side plate, a rear side plate, a left side plate, and a right side plate that are erected from the edges of the bottom plate and have an open top, and a lid plate that is connected to the upper edge of the rear side plate via a crease line and closes the opening, wherein the main body has an upper flap that is connected to the upper edge of the left side plate and the upper edge of the right side plate via a crease line and extends above the opening, and the lid plate is connected to the rear side plate The packaging box has an insert piece connected via a crease to a first edge opposite to the side edge, the insert piece having the first edge, a second edge opposite to the first edge, and a third and fourth edge connecting the first and second edges, and the third and fourth edges each having a first lock piece connected via a crease, and the packaging box with tamper-evident unpacking trace function has a locking mechanism in which, when the insert piece is inserted between the front side panel and the upper flap with the first lock piece folded inward to the insert piece, the first lock piece is locked to the lower surface of the upper flap. The left and right side panels each have front side flaps extending from the front side panel via creases in a direction adjacent to the front side panel, and the front side flaps have engaging portions that can engage with each other. The front side panel has an upper end panel and a folded side panel connected in series via the creases. In the tamper-proof packaging box with unpacking trace function, the folded side panel is folded inward and faces the front side panel, and the front side flaps are sandwiched between the front side panel and the folded side panel with their engaging portions engaged with each other. It is characterized by the following:

[0009] The tamper-proof packaging box with an opening trace function according to the present invention preferably has at least the lid plate having a vulnerable portion for opening.

[0010] In the tamper-proof packaging box with an unpacking trace function according to the present invention, the upper edge of the left side panel and the upper edge of the right side panel have a first region where the upper flap is provided and a second region that is closer to the front side panel than the first region, and it is preferable that the height of the second region from the bottom plate is greater than the height of the first region from the bottom plate.

[0011] In the tamper-proof packaging box with an unpacking trace function according to the present invention, the first locking piece is preferably connected to a part of the third edge and a part of the fourth edge on the second edge side, and the third edge and the fourth edge have a portion on which the first locking piece is provided and a portion on which the first locking piece is not provided.

[0012] In the tamper-proof packaging box with an unpacking trace function according to the present invention, it is preferable that the fold line forming the boundary between the left side panel and the upper flap, and the fold line forming the boundary between the right side panel and the upper flap, are both lead lines.

[0013] In the tamper-proof packaging box with an unpacking trace function according to the present invention, The bottom plate has a locking hole, and the folded side plate has a projection on the edge opposite the fold line. It is preferable. [Effects of the Invention]

[0014] According to this disclosure, it is possible to provide a tamper-proof packaging box with an unpacking trace function that allows for the confirmation of unpacking traces during logistics from the appearance of the cardboard box and allows for stable stacking. [Brief explanation of the drawing]

[0015] [Figure 1] This is a perspective view showing the lid of a packaging box with a tamper-evident unpacking trace function according to the first embodiment in an open state. [Figure 2] This is an unfolded view of a blank sheet of a packaging box with a tamper-proof unpacking trace function according to the first embodiment. [Figure 3] This is a magnified view of part A in Figure 1. [Figure 4] This is a magnified view of section B in Figure 2. [Figure 5] This is a magnified view of section C in Figure 2. [Figure 6] This is a diagram illustrating the assembly process of a packaging box with a tamper-proof unpacking trace function according to the first embodiment. [Figure 7] This is an unfolded view of a blank sheet for a packaging box with a tamper-evident unpacking trace function according to the second embodiment. [Figure 8] It is a partial enlarged view of part D in FIG. 7. [Figure 9] It is a diagram for explaining the assembly process of the packaging box with an anti-tampering unpacking trace function according to the second embodiment. [Figure 10] It is a developed view of the blank sheet of the packaging box with an anti-tampering unpacking trace function according to the third embodiment. [Figure 11] It is a diagram for explaining the assembly process of the packaging box with an anti-tampering unpacking trace function according to the third embodiment.

Modes for Carrying Out the Invention

[0016] Next, embodiments of the present invention will be shown and described in detail, but the present invention is not construed as being limited to these descriptions. As long as the effects of the present invention can be achieved, the embodiments may be variously modified.

[0017] (First Embodiment) Figure 1 is a perspective view showing the lid of the tamper-proof packaging box with an anti-tampering trace function according to the first embodiment in an open state. Figure 2 is an unfolded view of the blank sheet of the tamper-proof packaging box with an anti-tampering trace function according to the first embodiment. The tamper-proof packaging box 101A with an anti-tampering trace function according to the first embodiment shown in Figure 1 can be assembled, for example, from a single corrugated cardboard sheet as the blank sheet 100A, as shown in Figure 2. Next, the tamper-proof packaging box 101A with an anti-tampering trace function according to the first embodiment will be described with reference to the perspective view in Figure 1 and the unfolded view of the blank sheet 100A in Figure 2. The tamper-proof packaging box 101A (shown in Figure 1) according to the first embodiment is made of a single corrugated cardboard sheet as shown in Figure 2 and comprises a bottom plate 1 having four edges 50a, 50b, 50c, and 50d, a main body having an open top and front side plates 2a, rear side plate 2b, left side plate 2c, and right side plate 2d that are erected from the edges 50a, 50b, 50c, and 50d of the bottom plate 1 respectively, and a lid plate 3 that is connected to the upper edge 50e of the rear side plate 2b via a crease and closes the opening, wherein the main body extends above the opening, connected to the upper edge 50m of the left side plate 2c and the upper edge 50n of the right side plate 2d via creases. The packaging box has an upper flap 4, and the lid plate 3 has an insert piece 5 connected via a crease to a first edge 50f opposite to the edge 50e on the rear side plate 2b side, and the insert piece 5 has a first edge 50f, a second edge 51 opposite to 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 the third edge 53 and the fourth edge 54 have a first lock piece 6 connected via creases 50g and 50h respectively, and the packaging box with tamper-evident unpacking trace function has a locking mechanism in which, when the insert piece 5 is inserted between the front side plate 2a and the upper flap 4 with the first lock piece 6 folded inward to the insert piece 5, the first lock piece 6 is locked to the lower surface of the upper flap 4.

[0018] As shown in Figure 1, the tamper-proof packaging box 101A with an anti-tampering feature can have its top opening covered by a lid plate 3. When the lid plate 3 is closed, the tamper-proof packaging box 101A has a rectangular parallelepiped shape, and the rectangular parallelepiped internal space becomes the storage compartment 20.

[0019] In the blank sheet 100A, as shown in Figure 2, it is preferable that the insert piece 5, lid plate 3, rear side plate 2b, bottom plate 1, and front side plate 2a are connected in series along the grain direction of the corrugated cardboard sheet via crease lines 50f, 50e, 50b, and 50a. The front side plate 2a preferably has an upper end plate 9 and a folded side plate 10 connected in series via crease lines 50o and 50p. The first lock piece 6 is connected to both sides of the insert piece 5 via crease 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 crease lines 50c and 50d. The upper flap 4 is connected to the left side plate 2c and the right side plate 2d via crease lines 50m and 50n. The left side panel 2c and the right side panel 2d have rear side flaps 7a and 7b, respectively, extending via fold lines 50i and 50j in a direction adjacent to the rear side panel 2b, and front side flaps 8a and 8b, respectively, extending via fold lines 50k and 50l in a direction adjacent to the front side panel 2a. The rear side flaps 7a and 7b have engaging portions 7a1 and 7b1 that can engage with each other. The bottom panel 1 has a locking hole 11, and the folded side panel 10 has a projection 12 on the edge 52 facing the fold line 50p. When the folded side panel 10 is folded back towards the storage compartment 20 and facing the front side panel 2a, the projection 12 can be locked into the locking hole 11. The upper end panel 9 is formed when the folded side panel 10 is folded back toward the storage compartment 20 and faces the front side panel 2a, and two parallel fold lines 50o and 50p are valley-folded, forming the upper end surface of the front side panel 2a. The width of the upper end panel 9 is the distance between the centerlines of the fold lines 50o and 50p, and is preferably, for example, 11 mm to 13 mm. Here, since each edge and each fold line are in the same position, they are all given the same reference numeral 50 (50a to 50p).

[0020] Figure 5 is a magnified view of part C in Figure 2. The first locking piece 6 is provided on a portion of the third edge 53 and the fourth edge 54 on the side of the second edge 51. That is, the third edge 53 and the fourth edge 54 have a portion on which the first locking piece 6 is provided (the portion on which the fold lines 50g and 50h are provided) and a portion on which the first locking piece 6 is not provided. The length of the portion on the third edge 53 and the fourth edge 54 on which the first locking piece 6 is not provided, in other words, the distance H3 between the edges 55a, 55b that abut the third edge 53 or the fourth edge 54 and the first edge 50f is preferably between the thickness of one corrugated cardboard sheet and five corrugated cardboard sheets, and more preferably between the thickness of two corrugated cardboard sheets and four corrugated cardboard sheets. 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 inward of the insertion piece 5, the first locking piece 6 can be locked to the upper flap 4 without getting caught on it.

[0021] The length H4 of the first locking piece 6 is not particularly limited, but it is preferably long enough to be secured to the upper flap 4 and not come off by impact, for example, 40 mm is preferred. 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 opposite to the fold line 50g, or the distance between the fold line 50h provided on the fourth edge 54 and the edge 56b opposite to the fold line 50h, as shown in Figure 5.

[0022] In the tamper-proof packaging box 101A with an unpacking trace function according to the first embodiment, the left side panel 2c and the right side panel 2d each have a weak portion 14 for forming a lateral hole on the upper part of the front side panel 2a, and it is preferable that the lateral hole formed by breaking the weak portion 14 for forming a lateral hole is a hole for inserting a finger to release the locking mechanism.

[0023] The weak portion 14 for forming the lateral hole is an area enclosed by a weak line 14a, such as a perforation or half-cut line, and a fold line 14b, as shown in Figure 2, or it may be an area enclosed only by a weak line such as a perforation or half-cut line (not shown). The shape of the lateral hole formed by breaking the weak portion 14 for forming the lateral hole is not particularly limited as long as a finger can be inserted to release the locking mechanism, but for example it may be rectangular or elongated. The shape of the lateral hole formed by breaking the weak portion 14 for forming the lateral hole preferably has a notch 14c at the lower part on the front side plate 2a side. When the lateral hole is pushed in to move the first lock piece 6 toward the insertion piece 5 side, the notch 14c prevents the lateral hole from getting caught on the first lock piece 6.

[0024] In the tamper-proof packaging box 101A with an unpacking trace function according to the first embodiment, the lid plate 3 preferably has a knob portion 13 that protrudes from the first edge 50f. The knob portion 13 serves as a handle for opening the box. As shown in Figure 2, a notch is made that protrudes from the fold line 50f at the boundary between the lid plate 3 and the insert piece 5 towards the insert piece 5, and as shown in Figure 1, the fold line 50f is folded, so that the notched portion becomes the knob portion 13. The amount of protrusion of the knob portion 13 from the fold line 50f is preferably the width of the upper end plate 9 + 3 to 4 mm.

[0025] In the blank sheet 100A shown in Figure 2, the box 101A can be formed as shown in Figure 6 by valley folding along the fold lines 50 (50a to 50p). Next, the assembly process of the tamper-proof packaging box 101A with an unpacking trace function according to the first embodiment will be described with reference to Figure 6.

[0026] First, as shown in Figure 6(a), spread out one blank sheet 100A. Next, as shown in Figure 6(b), raise the left side plate 2c and the right side plate 2d, and fold the rear side flaps 7a and 7b inward so that the engaging parts 7a1 and 7b1 engage with each other as shown in Figure 6(c). Also, fold the front side flaps 8a and 8b inward so that the engaging parts 8a1 and 8b1 engage with each other as shown in Figure 6(d). Next, as shown in Figure 6(e), raise the front side plate 2a, and fold the folded side plate 10 inward so that it faces the front side plate 2a. At this time, the projection 12 (shown in Figure 2) is locked into the engagement hole 11 (shown in Figure 2), and the folded side plate 10 is fixed facing the front side plate 2a. Also, fold the upper flap 4 inward. Next, raise the rear side plate 2b as shown in Figure 6(f). Next, as shown by the arrow in Figure 6(f), the first locking piece 6 is folded inward into the insertion piece 5, and with the first locking piece 6 folded, the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4 as shown in Figure 6(g), forming a rectangular parallelepiped-shaped packaging box 101A with an anti-tampering and unpacking trace function, as shown in Figure 6(h). The top surface of the box 101A consists of a lid plate 3 and an upper end plate 9, and since both are on the same plane, there is no step on the top surface. Also, since the bottom surface of the box 101A consists of a bottom plate 1, there is no step on the bottom surface either. For this reason, the boxes 101A can be stacked stably.

[0027] The locking mechanism of the tamper-proof packaging box 101A with an unpacking trace function according to the first embodiment will now be described. When the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4 and the entire first lock piece 6 moves below the upper flap 4, the folded state of the first lock piece 6 is opened by the elastic force of the corrugated cardboard sheet, and the first lock piece 6 rotates on the crease lines 50g, 50h (shown in Figure 2) in the direction of the left side plate 2c or the right side plate 2d. Since the upper flap 4 is above the first lock piece 6, if the lid plate 3 is lifted upward to open the box 101A, the first lock piece 6 is locked to the lower surface of the upper flap 4 and the box cannot be opened. If the lid plate 3 is moved further upward and the box 101A is forcibly opened, the first lock piece 6 will break, leaving an unpacking trace. Furthermore, to open the box 101A without breaking the first locking piece 6, a lateral hole is formed by pushing the weak part 14 for forming the lateral hole inward into the box 101A and breaking it. Then, by inserting, for example, an index finger through the lateral hole and folding the first locking piece 6 inward into the insertion piece 5, and then placing, for example, a thumb on the handle 13 and moving the lid plate 3 upward, the insertion piece 5 and the first locking piece 6 can be pulled out from between the front side plate 2a and the upper flap 4, and the box 101A is opened. At this time, the fact that the weak part 14 for forming the lateral hole has broken allows for confirmation of the unpacking marks.

[0028] (Second embodiment) The tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment, as shown in Figures 7 to 9, has the same basic configuration as the tamper-proof packaging box 101A with an unpacking trace 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 the unpacking unreliable part 17 is provided instead of the unreliable part 14 for forming a lateral hole. For this reason, the description of the common components will be omitted, and the differing components will be described.

[0029] In the tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment, the insert piece 5 is connected via fold lines 50q and 50r to edges 55a and 55b of the first lock piece 6 that abut against the third edge 53 or the fourth edge 54, and further has a second lock piece 15 that extends to the side adjacent to the lid plate 3. The locking mechanism is preferably structured such that when the insert piece 5 is inserted between the front side plate 2a and the upper flap 4 with the second lock piece 15 folded inward of the first lock piece 6 and the overlapping second lock piece 15 and first lock piece 6 folded inward of the insert piece 5, the first lock piece 6 is locked to the lower surface of the upper flap 4 and the second lock piece 15 is parallel to the lower surface of the upper flap 4.

[0030] Figure 8 is a partially enlarged view of portion D in Figure 7. The second locking piece 15 is preferably provided on a portion of the edges 56a, 56b that are opposite the fold lines 50g, 50h among the edges 55a, 55b that abut the third edge 53 or the fourth edge 54. That is, it is preferable that the edges 55a, 55b have a portion where the second locking piece 15 is provided (the portion where the fold lines 50q, 50r are provided) and a portion where the second locking piece 15 is not provided. If the second locking piece 15 is provided along the entire edge 55a, 55b that abuts the third edge 53 or the fourth edge 54, the overlapping second locking piece 15 and the first locking piece 6 may become bulky, making it difficult to fold them inward into the insert piece 5. However, by providing the second locking piece 15 on a portion of the edge 55a, 55b that abuts the third edge 53 or the fourth edge 54, the overlapping second locking piece 15 and the first locking piece 6 can be easily folded inward into the insert piece 5. Preferably, the length H4 of the portion of the edge 55a, 55b where the second locking piece 15 is not provided is 13 mm or more and 15 mm or less.

[0031] In the packaging box 101B with tamper-proof unpacking trace function according to the second embodiment, it is preferable that at least the lid plate 3 has an opening fragile portion 17, as shown in Figure 7. The opening fragile portion 17 is, for example, a perforated or half-cut break line. It is preferable that the opening fragile portion 17 is formed spanning from the lid plate 3 to the rear side plate 2b, as shown in Figure 7.

[0032] In the tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment, it is preferable that the insert piece 5 has a locking hole 16 that locks the second lock piece 15 when the second lock piece 15 moves toward the insert piece 5. By locking the second lock piece 15 into the locking hole 16, it is possible to prevent the first lock piece 6 from being unintentionally folded inward of the insert piece 5. This makes it possible to more reliably prevent unauthorized opening.

[0033] In the blank sheet 100B shown in Figure 7, the box 101B can be formed as shown in Figure 9 by valley folding along the fold lines 50 (50a to 50r). Next, the assembly process of the tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment will be described with reference to Figure 9.

[0034] The steps in Figures 9(a) to (e) are the same as those in Figures 6(a) to (e), so their explanation will be omitted, and Figures 9(f) to 9(i) will be explained. As shown in Figure 9(f), the rear side plate 2b is raised, and the second lock piece 15 is folded inward of the first lock piece 6 as indicated by the arrow in Figure 9(f). Next, as indicated by the arrow in Figure 9(g), the overlapping second lock piece 15 and first lock piece 6 are folded inward of the insertion piece 5. Then, as shown in Figure 9(h), with the second lock piece 15 and first lock piece 6 folded inward of the insertion piece 5, the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4, forming a rectangular parallelepiped-shaped tamper-proof packaging box 101B with an unpacking trace function, as shown in Figure 9(i).

[0035] The locking mechanism of the tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment will now be described. When the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4, and the entirety of the second lock piece 15 and the first lock piece 6 moves below the upper flap 4, the folded state of the second lock piece 15 and the first lock piece 6 is opened by the elastic force of the corrugated cardboard sheet, and the first lock piece 6 rotates on the crease lines 50g, 50h (shown in Figure 2) in the direction of the left side plate 2c or the right side plate 2d, and the second lock piece 15 is parallel to the lower surface of the upper flap 4. Since the upper flap 4 is above the second lock piece 15 and the first lock piece 6, if you try to open the box 101A by lifting the lid plate 3 upward, the second lock piece 15 and the first lock piece 6 are locked to the lower surface of the upper flap 4 and cannot be opened. If the lid plate 3 is moved further upward and the box 101A is forcibly opened, the first locking piece 6 will break, leaving traces of unpacking. Alternatively, if the box 101B is opened without breaking the first locking piece 6, the top of the box 101B is opened by breaking the opening-fragile part 17. In this case, traces of unpacking can be confirmed by the fact that the opening-fragile part 17 has broken.

[0036] The tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment has a second locking piece 15, which prevents the first locking piece 6 from being unintentionally folded inward into the inserting piece 5. Therefore, unauthorized opening can be prevented more reliably.

[0037] In the first embodiment, the tamper-proof packaging box 101A with an unpacking trace function had a tab 13 used for opening, as shown in Figure 1. In contrast, the tamper-proof packaging box 101B with an unpacking trace function in the second embodiment is opened by breaking the fragile opening part 17, so a tab 13 is not necessary, although a tab 13 may be provided.

[0038] (Third embodiment) The tamper-proof packaging box 101C with an unpacking trace function according to the third embodiment has the same basic configuration as the tamper-proof packaging box 101B with an unpacking trace function according to the second embodiment, except that, as shown in Figures 10 and 11, it is equipped with a weak part 18 for forming a lateral hole instead of a weak part 17 for opening. Therefore, the description of the common components will be omitted, and the differing components will be described.

[0039] The weak portion 18 for forming a lateral hole preferably has a first lateral hole forming portion 18a and a second lateral hole forming portion 18b. The first lateral hole forming portion 18a is a portion for forming a first lateral hole by piercing through the left side plate 2c and the right side plate 2d, and is an area surrounded by a weak line such as a perforation or a half-cut line. The second lateral hole forming portion 18b may be an area surrounded by a weak line such as a perforation or a half-cut line and a fold line, similar to the weak portion 14 for forming a lateral hole in the first embodiment shown in Figure 2, or it may be an area surrounded only by a weak line such as a perforation or a half-cut line (not shown). In the first embodiment, the weak portion 14 for forming a lateral hole was formed by pushing the entire structure inward, but in the third embodiment, the weak portion 18 for forming a lateral hole was formed by pushing the first lateral hole forming portion 18a inward to break through the left side plate 2c and the right side plate 2d, and then a second lateral hole was formed by inserting a finger into the first lateral hole and tearing the second lateral hole forming portion 18b outward.

[0040] In the blank sheet 100C shown in Figure 10, the box 101B can be formed as shown in Figure 11 by valley folding along the fold lines 50 (50a to 50r). Next, the assembly process of the tamper-proof packaging box 101C with an unpacking trace function according to the third embodiment will be described with reference to Figure 11.

[0041] The steps in Figures 11(a) to 11(i) are the same as the steps in Figures 9(a) to 11(i).

[0042] The locking mechanism of the packaging box 101C with tamper-evident unpacking trace function according to the third embodiment will now be described. When the insertion piece 5 is inserted between the front side plate 2a and the upper flap 4, and the entirety of the second lock piece 15 and the first lock piece 6 moves below the upper flap 4, the folded state of the second lock piece 15 and the first lock piece 6 is opened by the elastic force of the corrugated cardboard sheet, and the first lock piece 6 rotates on the crease lines 50g, 50h (shown in Figure 2) in the direction of the left side plate 2c or the right side plate 2d, and the second lock piece 15 is parallel to the lower surface of the upper flap 4. Since the upper flap 4 is above the second lock piece 15 and the first lock piece 6, if the lid plate 3 is lifted upward to open the box 101A, the second lock piece 15 and the first lock piece 6 are locked to the lower surface of the upper flap 4 and the box cannot be opened. If the lid plate 3 is moved further upward and the box 101A is forcibly opened, the first locking piece 6 will break, leaving traces of unpacking. Furthermore, to open the box 101B without breaking the first lock piece 6, the first horizontal hole forming portion 18a of the weak portion 18 for forming the horizontal hole is pushed inward to break through the left side plate 2c and the right side plate 2d to form the first horizontal hole, a finger is inserted into the first horizontal hole and the second horizontal hole forming portion 18b is pulled outward to form the second horizontal hole, for example, an index finger is inserted through the second horizontal hole to fold the second lock piece 15 inward of the first lock piece 6, and with the stacked second lock piece 15 and first lock piece 6 folded inward of the insertion piece 5, the lid plate 3 is moved upward, allowing the insertion piece 5, the first lock piece 6 and the second lock piece 15 to be pulled out 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 weak portion 18 for forming the horizontal hole has been broken allows for confirmation of the unpacking marks.

[0043] The tamper-proof packaging box 101C with an unpacking trace function according to the third embodiment has a second locking piece 15, which prevents the first locking piece 6 from being unintentionally folded inward into the inserting piece 5. Therefore, unauthorized opening can be prevented more reliably.

[0044] In the third embodiment, the tamper-proof packaging box 101C with an unpacking trace function may have a lid plate 3 that has a tab portion 13 (shown in Figures 1 and 2) protruding from the first edge 50f.

[0045] Next, preferred configurations for boxes 101A, 101B, and 101C according to the first to third embodiments will be described to more reliably prevent unauthorized opening.

[0046] Figure 3 is a magnified view of part A in Figure 1. Figure 4 is a magnified view of part B in Figure 2. In Figures 3 and 4, the left side panel 2c is shown as an example, but the right side panel 2d has a similar structure. Also, in Figures 3 and 4, the box 101A of the first embodiment is shown as an example, but it is preferable that the box 101B of the second embodiment and the box 101C of the third embodiment have a similar structure. Part B in Figure 4 shows the part that corresponds to part A in Figure 3 on the blank sheet 100A. In the tamper-proof packaging boxes 101A, 101B, and 101C with unpacking trace function according to the first to third embodiments, the upper edge 50m of the left side panel 2c and the upper edge 50n of the right side panel 2d have a first region 21 on which the upper flap 4 is provided and a second region 22 on the front side panel 2a side of the first region 21, and it is preferable that the height of the second region 22 from the bottom plate 1 is higher than the height of the first region 21 from the bottom plate 1. The amount H1 of the protrusion of the second region 22 relative to the upper surface of the upper 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 lock piece 6, i.e., the thickness of two corrugated 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 lock piece 6 and the second lock piece 15, i.e., the thickness of three corrugated cardboard sheets.

[0047] As shown in Figures 2, 7, and 8, it is preferable that the crease line 50m, which forms the boundary between the left side panel 2c and the upper flap 4, and the crease line 50n, which forms the boundary between the right side panel 2d and the upper flap 4, are both lead lines. A lead line is a line in which folds and cuts are formed alternately in a straight line. By making the crease lines 50m and 50n lead lines, the folding position of the upper flap 4 can be more reliably made to lie on the crease lines 50m and 50n, and the gap between the lid 3 and the upper flap 4 can be made smaller when the lid 3 is closed. This prevents attempts to insert a thin plate-like object through the gap between the lid 3 and the upper flap 4 to release the locking mechanism for the purpose of tampering. At this time, it is preferable that the direction of the crease lines 50m and 50n and the grain direction of the corrugated cardboard sheet are in the same direction. The folding position of the upper flap 4 becomes less likely to shift, and the gap between the lid 3 and the upper flap 4 can be made smaller. This prevents attempts to tamper with the lock mechanism by inserting a thin plate-like object through the gap between the cover plate 3 and the upper flap 4 to release the lock.

[0048] As shown in Figures 2, 7, and 8, it is preferable that the front side flaps 8a and 8b have engaging portions 8a1 and 8b1 that can engage with each other. In a box where the folded side plate 10 is folded back towards the storage compartment 20 and faces 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 generally, the engagement function of the front side flaps 8a and 8b is unnecessary. 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 become less likely to move in the left-right direction, so the gap between the lid plate 3 and the upper flap 4 can be made smaller. This prevents attempts to insert a thin plate-like object through the gap between the lid plate 3 and the upper flap 4 to release the locking mechanism for the purpose of tampering. The claims of this application as they were at the time of filing are included below. (Note 1) A tamper-proof packaging box with an unpacking trace function, comprising a base plate having four edges, a main body having an open top and front side plate, a rear side plate, a left side plate, and a right side plate, each rising from the edges of the base plate, and a lid plate connected to the upper edge of the rear side plate via a crease line to close the opening, The main body has an upper flap that extends above the opening, connected to the upper edge of the left side panel and the upper edge of the right side panel via fold lines. The cover plate has an insert piece connected via a fold line to the first edge opposite to the edge on the rear side plate side, The insert piece has a first edge, a second edge opposite to the first edge, 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 a fold line, The tamper-proof packaging box with an unpacking trace function is characterized by having a locking mechanism in which, when the insertion piece is inserted between the front side plate and the upper flap with the first lock piece folded inward of the insertion piece, the first lock piece is locked to the lower surface of the upper flap. (Note 2) The tamper-proof packaging box with an opening trace function is characterized in that at least the lid plate has a vulnerable portion for opening, as described in Appendix 1. (Note 3) The upper edge of the left side panel and the upper edge of the right side panel have a first region where the upper flap is provided and a second region that is closer to the front side panel than the first region. The tamper-proof packaging box with an unpacking trace function according to Appendix 1 or 2, 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. (Note 4) The tamper-proof packaging box with an unpacking trace function as described in any one of the appendices 1 to 3, characterized in that the first locking piece is connected to a portion of the third edge and a portion of the fourth edge on the second edge side, and the third edge and the fourth edge have a portion on which the first locking piece is provided and a portion on which the first locking piece is not provided. (Note 5) A tamper-proof packaging box with an unpacking trace function as described in any one of the appendices 1 to 4, characterized in that the fold line forming the boundary between the left side panel and the upper flap, and the fold line forming the boundary between the right side panel and the upper flap, are both lead lines. (Note 6) The left side panel and the right side panel each have front side flaps that extend via fold lines in a direction adjacent to the front side panel. The packaging box with tamper-evident unpacking trace function according to any one of the appendices 1 to 5, characterized in that the front side flaps have engaging portions that can engage with each other. [Explanation of Symbols]

[0049] 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 Insertion piece 6. First lock piece 7a, 7b Rear side flaps 7a1,7b1 Engagement part 8a, 8b Front side flaps 8a1,8b1 Engagement part 9 Top end face plate 10 Folded side panels 11 Recessed hole 12. Protrusion 13. Knob section 14 Weak part for forming horizontal hole 14a Vulnerable line 14b Folding lines 14c notch 15th Rock Piece 16 Locking holes 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 Confinement Rooms 21 First area 22 Second area 50 (50a~50r) Folding lines 51 Second edge 52 Edge 53 Third edge 54. Fourth edge 55a,55b Edge 56a,56b Edge 101A, 101B, 101C Tamper-evident packaging boxes with tamper-proof opening trace function 100A, 100B, 100C Blank Sheet H1 Protrusion amount of the second region relative to the upper surface of the upper flap H2 Width of the second region H3 Distance between the edge touching the third or fourth edge and the first edge. H4 Length of the first lock piece

Claims

1. A tamper-proof packaging box with an unpacking trace function, comprising a base plate having four edges, a main body having an open top and front side plate, a rear side plate, a left side plate, and a right side plate, each rising from the edges of the base plate, and a lid plate connected to the upper edge of the rear side plate via a crease line to close the opening, The main body has an upper flap that extends above the opening, connected to the upper edge of the left side panel and the upper edge of the right side panel via fold lines. The cover plate has an insert piece connected via a fold line to the first edge opposite to the edge on the rear side plate side, The insert piece has a first edge, a second edge opposite to the first edge, 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 a fold line. The aforementioned tamper-proof packaging box with an unpacking trace function has a locking mechanism in which, when the first locking piece is folded inward of the insertion piece and the insertion piece is inserted between the front side plate and the upper flap, the first locking piece is locked to the lower surface of the upper flap. The left side panel and the right side panel each have front side flaps that extend via fold lines in a direction adjacent to the front side panel. The front side flaps have engaging portions that can engage with each other, The front side panel has an upper end panel and a folded side panel that are connected in series via the folding lines, The tamper-proof packaging box with an anti-tampering and anti-opening trace function is characterized in that the folded side panel is folded inward and faces the front side panel, and the front side flap is sandwiched between the front side panel and the folded side panel with the engaging portions engaged with each other.

2. The packaging box with tamper-proof unpacking trace function according to claim 1, characterized in that at least the lid plate has a vulnerable portion for opening.

3. The upper edge of the left side panel and the upper edge of the right side panel have a first region where the upper flap is provided and a second region that is closer to the front side panel than the first region. The packaging box with tamper-proof unpacking trace function according to claim 1 or 2, 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.

4. The first locking piece is connected to a portion of the third edge and the fourth edge on the side of the second edge, and the third edge and the fourth edge have a portion on which the first locking piece is provided and a portion on which the first locking piece is not provided, characterized in that the packaging box with tamper-evident unpacking trace function according to any one of claims 1 to 3.

5. The packaging box with tamper-proof unpacking trace function according to any one of claims 1 to 4, characterized in that the fold line forming the boundary between the left side panel and the upper flap, and the fold line forming the boundary between the right side panel and the upper flap are both lead lines.

6. The bottom plate has a locking hole, and the folded side plate has a projection on the edge opposite to the fold line, as described in any one of claims 1 to 5, for packaging boxes with tamper-evident unpacking traces.

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