Packing box

Abstract

To provide a packaging box that can prevent unintentional product spillage while providing the advantages of conventional packaging boxes.SOLUTION: A packaging box 1 is rectangular in shape and is a so-called wrap-around case type. A lower outer flap 32, which contacts an inner flap 33 from the outside, is not fixed to the inner flap 33, and an upper outer flap 31, which contacts the lower outer flap 32 from the outside, is glued to the lower outer flap 32. A top panel 4 includes: a door fold line d; a door breakable line 41 connecting both ends of the door fold line d; and an open breakable line 44 extending from the end of the door breakable line 41 to the corner of the adjacent top panel 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging box in which a part of the box is broken when opened.

Background Art

[0002] Conventionally, a rectangular parallelepiped wraparound case type packaging box that can accommodate a plurality of products is known (see Patent Document 1).

[0003] This packaging box has a front plate, a rear plate, a top plate, a bottom plate, etc. integrally formed. Further, this packaging box includes a pair of first inner flaps continuously provided so as to bend inward from the left and right end portions of the front plate, and a pair of second inner flaps continuously provided so as to bend inward from the left and right end portions of the rear plate.

[0004] Also, this packaging box is continuously provided so as to bend inward from the left and right end portions of the bottom plate, is disposed outside a pair of first inner flaps and a pair of second inner flaps, and includes a pair of first outer flaps that are not fixed to the pair of first inner flaps, and a pair of second outer flaps continuously provided so as to bend inward from the left and right end portions of the top plate and fixed in a state of contacting the pair of first outer flaps from the outside respectively.

[0005] And the first inner flap has a shape in which the front corner portion is cut out in an arc shape, and a breakable line for breaking the top plate when the packaging box is opened is formed on the top plate. This breakable line connects both corners on the front plate side of the top plate and extends convexly toward the rear plate side.

[0006] Thereby, when opening this packaging box, an operator can break a part of the top plate along the breakable line and pull it forward, so that the top plate, the front plate, and the pair of first inner flaps can be integrally rotated forward, and both the top plate and the front plate of the packaging box can be opened at once.

[0007] Therefore, for example, by tilting the front of the opened packaging box downwards, the contents can be easily transferred to shelves or freezers. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Utility Model Registration No. 3235742 Gazette [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] However, especially when the contained goods cannot stand on their own, there is a problem with the conventional packaging boxes described above: when you want to take out part of the goods from the opened packaging box, or when you want to use the opened packaging box as a tray, the goods may unintentionally spill out of the packaging box.

[0010] The present invention aims to solve the above problems by providing a packaging box that has the advantages of conventional packaging boxes while preventing products from unintentionally spilling out. [Means for solving the problem]

[0011] To achieve this objective, the first packaging box of the present invention is a packaging box having a rectangular tubular body and a closing part that closes the open end of the body, wherein the body is composed of a top plate, a bottom plate facing the top plate, and a side plate connecting the top plate and the bottom plate, each connected via a body fold line, the top plate and the bottom plate have outer flaps connected to both ends on the open end side of the body via an outer flap fold line, the side plate has inner flaps connected to both ends on the open end side of the body via an inner flap fold line, and the closing part has an inner flap folded inward along the inner flap fold line and one outer flap connected to the top plate and the bottom plate, which is folded inward along the outer flap fold line The door is closed by an outer flap which is not fixed to the inner flap and is in contact with the inner flap from the outside, and an outer flap which is connected to the other of the top plate and the bottom plate and is bent inward along the outer flap fold line and fixed to the non-fixed outer flap in contact with the non-fixed outer flap from the outside, and the top plate is provided with a door fold line which extends along the outer flap fold line, a door breakable line which connects both ends of the door fold line and extends convexly in the direction away from the outer flap fold line, and an open breakable line which extends from the end of the door breakable line to the corner of the top plate adjacent to the end of the door breakable line or to the edge of the outer flap adjacent to the end of the door breakable line.

[0012] In the first packaging box of the present invention, the top panel is provided with a door fold line extending along the outer flap fold line, and a door breakable line connecting both ends of the door fold line and extending convexly away from the outer flap fold line. Therefore, an operator can break the top panel along the door breakable line, and by pulling the area enclosed by the door breakable line and the door fold line (hereinafter simply referred to as the "door section") outward from the packaging box, the door breakable line is gradually broken, and by rotating and folding along the door fold line, a portion of the top panel can be opened.

[0013] Therefore, according to the first packaging box of the present invention, since the top panel can be opened while the four sides of the packaging box are surrounded by a pair of side panels and a pair of closing parts, it is possible to prevent the product from spilling out unintentionally.

[0014] Furthermore, in the first packaging box of the present invention, the top panel is provided with an openable breakable line that extends from the end of the door breakable line to the corner of the top panel adjacent to the end of the door breakable line or to the edge of the outer flap adjacent to the end of the door breakable line. Therefore, by pulling the door, the top panel is broken along the openable breakable line to the corner of the top panel adjacent to the end of the door breakable line or to the edge of the outer flap adjacent to the end of the door breakable line.

[0015] In this process, the broken and separated top panel is connected to the outer flap on the top panel side via the outer flap fold line, and the outer flap on the top panel side is fixed to the outer flap on the bottom panel side. However, since both outer flaps are not fixed to the inner flap, the separated top panel and both outer flaps can rotate together along the outer flap fold line on the bottom panel side. The inner flap, from which the outer flap that it was previously in contact with has been removed, can then be folded back along the inner flap fold line.

[0016] Therefore, according to the first packaging box of the present invention, not only the top panel but also the closing part can be opened.

[0017] In the first packaging box of the present invention, the top panel has a door fold line, a door breakable line, and an open breakable line at each of the two ends on the open end side of the body, and it is preferable that the two door breakable lines are in contact at least in part.

[0018] With this type of packaging box, the top can be opened wide by opening the doors on both sides, making it easy to take out the product.

[0019] Also, by breaking the top plate along both release breakable lines, both closure parts can be opened. Further, since the two-door breakable lines are in partial contact, the top plate is divided by the two-door breakable lines. That is, since the two side plates are not connected by the remaining top plate, they can rotate along the body fold line on the bottom plate side.

[0020] Therefore, according to the packaging box having this configuration, the packaging box can be fully unfolded to make the number of waste parts "1". Also, since the fully unfolded packaging box returns to a flat plate shape, it is possible to prevent waste from becoming bulky.

[0021] In the first packaging box of the present invention, it is preferable that the door breakable line includes a first door breakable line connecting the side ends of the top plate, and a pair of second door breakable lines extending from both ends of the first door breakable line along the side ends of the top plate.

[0022] According to the packaging box having this configuration, since the top plate can be widely opened, it is easy to take out the product. Also, since the second door breakable line and the body fold line coincide, when making the packaging box from a flat plate and folding it along the body fold line to form a rectangular tube-shaped body, it is possible to prevent the top plate from being accidentally bent along the door break line.

[0023] In the first packaging box of the present invention, it is preferable that the door fold line is formed along the outer flap fold line at the middle part in the length direction of the outer flap fold line.

[0024] According to the packaging box having this configuration, there is no need to separately provide the door fold line on the top plate. Also, since the outer flap fold line having a fold mark during box manufacturing before opening is utilized as the door fold line, the door part (the area surrounded by the door breakable line and the door fold line) can be easily opened simply by breaking the top plate along the two-door breakable lines.

[0025] Also, when the door part is opened and only the top plate is opened, an unbroken top plate remains in the directions of both ends from the door fold line to the outer flap fold line. Therefore, when stacking the packaging boxes with the door part opened, this unbroken top plate becomes a crossbar part, so they can be easily stacked.

[0026] The second packaging box of the present invention is a packaging box having a rectangular tube-shaped body part and a closing part for closing the open end of the body part. The body part is composed of a top plate, a bottom plate facing the top plate, and side plates connecting the top plate and the bottom plate, which are continuously provided via body part fold lines. On one of the top plate and the bottom plate, outer flaps are continuously provided at both ends on the open end side of the body part via outer flap fold lines. The outer flap has an insertion piece via an insertion fold line at its tip. On the side plates, inner flaps are continuously provided at both ends on the open end side of the body part via inner flap fold lines. The closing part is closed by the inner flap bent inward along the inner flap fold line, the outer flap that is bent inward along the outer flap fold line and is not fixed to the inner flap in a state of contacting the inner flap from the outside, and the insertion piece provided at the tip of the outer flap and inserted into the gap between the other of the top plate and the bottom plate and the inner flap. The top plate is provided with a door fold line extending along the outer flap fold line, a door breakable line connecting both ends of the door fold line and convexly extending in a direction away from the outer flap fold line, and an open breakable line extending from an end of the door breakable line to a corner of the top plate adjacent to the end of the door breakable line or an edge of the outer flap adjacent to the end of the door breakable line.

[0027] In the second packaging box of the present invention, the procedure, operation, and effect when opening the top plate are the same as those of the first packaging box.

[0028] On the other hand, if an outer flap is attached to the top panel, pulling the door section will cause the top panel to break, and the insertion piece at the tip of the outer flap connected to it will be pulled out from the gap between the bottom panel and the inner flap, and the removed top panel and outer flap will be removed as a single unit. The inner flap, from which the outer flap that was in contact on the outside has been removed, can then be folded back along the inner flap fold line.

[0029] Similarly, if an outer flap is attached to the bottom plate, when the broken top plate is removed, the insert at the tip of the outer flap is released from being trapped in the gap between the top plate and the inner flap. This allows the outer flap to be folded back along the outer flap fold line and the inner flap to be folded back along the inner flap fold line, thus opening the closure according to the second packaging box.

[0030] Therefore, with the second packaging box, not only the top panel but also the closure can be opened.

[0031] The third packaging box of the present invention is a packaging box having a rectangular tubular body and a closing part that closes the open end of the body, wherein the body is composed of a top plate, a bottom plate facing the top plate, and a side plate connecting the top plate and the bottom plate, each connected via a body fold line, the top plate and the bottom plate have outer flaps connected to the end on the open end side of the body via an outer flap fold line, the side plate has an inner flap connected to the end on the open end side of the body via an inner flap fold line, and the closing part has an inner flap folded inward along the inner flap fold line and one outer flap connected to the top plate and the bottom plate, which is folded inward along the outer flap fold line and in contact with the inner flap from the outside The inner flap is closed by an outer flap that is not fixed to the inner flap in a certain state, and an outer flap that is connected to the other of the top plate and the bottom plate, and is fixed to the outer flap that is folded inward along the outer flap fold line and in contact with the outer flap from the outside, and the top plate is provided with a door fold line that extends along the outer flap fold line, and a door breakable line that connects both ends of the door fold line and extends convexly in the direction away from the outer flap fold line, and the top plate or the side plate is provided with an open breakable line that extends from the end of the door breakable line to the end of the body of the top plate and the side plate on the open end side and is sandwiched between the outer flap and the inner flap.

[0032] In the first and second packaging boxes described above, the breakable opening line was described as extending from the end of the breakable door line to the corner of the top panel adjacent to the end of the breakable door line or to the edge of the outer flap adjacent to the end of the breakable door line. However, the breakable opening line may also extend to the open end of the body portion of the top panel and side panel, to the area sandwiched between the outer flap and the inner flap, as in the third packaging box.

[0033] In short, by pulling the door section, the top panel is broken along the breakable opening line to the end of the top panel where the outer flap is not provided, or the top panel and side panel are broken along the breakable opening line to the end of the side panel where the inner flap is not provided, and the removed top panel and both outer flaps can then rotate together along the outer flap fold line on the bottom panel side.

[0034] Therefore, according to the third packaging box of the present invention, not only the top panel but also the closing part can be opened. [Brief explanation of the drawing]

[0035] [Figure 1] This is a perspective view showing the appearance of a packaging box according to the first embodiment of the present invention. [Figure 2] This is a plan view showing the configuration of the packaging box according to the first embodiment before assembly. [Figure 3] This is a perspective view showing the packaging box according to the first embodiment when the top panel has been opened. [Figure 4] This is a perspective view showing the packaging box according to the first embodiment when the closure is opened. [Figure 5] This is a plan view showing the packaging box according to the first embodiment after unfolding. [Figure 6] This is a perspective view showing the appearance of a packaging box according to a second embodiment of the present invention. [Figure 7] This is a plan view showing the configuration of the packaging box according to the second embodiment before assembly. [Figure 8] This is a perspective view showing the packaging box according to the second embodiment when the top panel has been opened. [Figure 9] This is a perspective view showing the packaging box according to the second embodiment when the closure is opened. [Figure 10] This is a plan view showing the packaging box according to the second embodiment after unfolding. [Figure 11] This is a plan view showing the configuration of the packaging box before assembly according to the third and fourth embodiments of the present invention. [Modes for carrying out the invention]

[0036] [First Embodiment] The packaging box 1 according to the first embodiment of the present invention will be described below with reference to Figures 1 to 5. As shown in Figure 1, the packaging box 1 of the first embodiment is a wrap-around case type with an external appearance formed in the shape of a rectangular parallelepiped. The packaging box 1 is used to store products that are easily damaged when stacked, such as ice cream bars, and a part of the box is broken when opened.

[0037] The packaging box 1 has a rectangular cylindrical body 2 and a closing part 3 that closes the open end of the body 2. The body 2 is equipped with a top plate 4, a bottom plate 5, and side plates 6, 6. The top plate 4, bottom plate 5, and side plates 6, 6 are all formed in a roughly rectangular shape.

[0038] The top panel 4 has a pair of door sections 7 that rotate toward the closing section 3 when opened. Each door section 7 has a break-start section 8 formed at the tip of the door section 7 for inserting fingers when opened.

[0039] The packaging box 1 is formed by punching out a roughly rectangular corrugated cardboard sheet 1x, as shown in Figure 2, from a base paper, and then folding and assembling it. The structure of the corrugated cardboard sheet 1x will be described below with reference to Figure 2.

[0040] As shown in Figure 2, the corrugated cardboard sheet 1x is connected from right to left in the following order: side panel 6, bottom panel 5, side panel 6, top panel 4, and adhesive piece 9, each connected via the fold line a on the body.

[0041] The top panel 4 has upper outer flaps 31 connected to its upper and lower ends via upper outer flap fold lines b1. Each of the upper outer flaps 31 is formed in a roughly rectangular shape.

[0042] The bottom plate 5 has lower outer flaps 32 connected to its upper and lower ends via lower outer flap fold lines b2. The lower outer flaps 32 are all formed in a roughly rectangular shape.

[0043] The side panel 6 has inner flaps 33 connected to its upper and lower ends via inner flap fold lines c. Each inner flap 33 is formed in a roughly rectangular shape. The width of the inner flap 33 is approximately the same as, or equal to, the height (vertical length in Figure 2) of the upper outer flap 31 and the lower outer flap 32.

[0044] The top panel 4 is provided with a pair of door fold lines d adjacent to its upper and lower ends. The door fold lines d extend parallel to the upper outer flap fold line b1, connecting the left and right ends of the top panel 4. The door fold lines d extend at a predetermined distance from the upper outer flap fold line b1.

[0045] The top panel 4 has a pair of door breakable lines 41 that connect both ends of the door fold line d. The door breakable lines 41 extend convexly away from the upper outer flap fold line b1 and, in the first embodiment, are formed in a roughly inverted "U" shape. The door section 7 described above is formed by the door fold line d and the door breakable lines 41 that connect both ends of it.

[0046] The door breakable line 41 has a first door breakable line 42 connecting the left and right ends of the top panel 4, and a pair of second door breakable lines 43 extending from both ends of the first door breakable line 42 along the left and right ends of the top panel 4 to the ends of the door fold line d. In the first embodiment, a pair of door breakable lines 41 are formed, but they completely overlap in the first door breakable line 42. In other words, two door breakable lines 41 are formed by sharing one first door breakable line 42 and having a total of four second door breakable lines 43 extending from both ends of it.

[0047] The first door breakable line 42 has a central first door breakable line 42a that extends parallel to the upper and lower edges of the top plate 4 in the center in the left-right direction, a right first door breakable line 42b that extends in a straight line downward to the right from the right end of the central first door breakable line 42a to the right edge of the top plate 4, and a left first door breakable line 42c that extends in a straight line upward to the left from the left end of the central first door breakable line 42a to the left edge of the top plate 4.

[0048] The top panel 4 is provided with a pair of hand-hole fold lines e that sandwich the central first door breakable line 42a from above and below. The hand-hole fold lines e are formed parallel to the central first door breakable line 42a.

[0049] The top panel 4 is provided with hand-hole breakable lines 81 that extend in an arc from the left and right ends of the hand-hole fold line e to the central first door breakable line 42a. The breakable starting section 8 described above is formed by one hand-hole fold line e and the pair of hand-hole breakable lines 81 extending from both ends of it.

[0050] The top panel 4 is provided with an openable breakable line 44 that extends from the end of the door breakable line 41 (the end of the second door breakable line 43 on the side where the first door breakable line 42 is not connected) to the corner of the adjacent top panel 4. The openable breakable line 44 is formed along the left and right edges of the top panel 4.

[0051] Next, we will explain the procedure for assembling the packaging box 1 shown in Figure 1 from the corrugated cardboard sheet 1x shown in Figure 2.

[0052] First, a worker places a sheet of corrugated cardboard 1x on, for example, a table (not shown), and then places multiple products (not shown) on a base plate 5 in an orderly fashion.

[0053] Next, in Figure 2, the side plate 6 located to the right of the base plate 5 is folded along the body fold line a. Then, adhesive G (see Figure 2) is applied to the outer surface of the right side plate 6.

[0054] Next, by sequentially folding along the fold line a located on the left side of the base plate 5, the left side plate 6 is raised relative to the base plate 5, the top plate 4 is made parallel to the base plate 5, and the adhesive piece 9 hangs down. Then, the inner surface of the adhesive piece 9 is fixed to the outer surface of the right side plate 6 via adhesive G, thereby assembling the body 2.

[0055] Next, the inner flap 33 is folded inward toward the body 2 at the inner flap fold line c, perpendicular to the side plate 6. Then, the lower outer flap 32 is folded upward at the lower outer flap fold line b2, and stands up perpendicular to the bottom plate 5. As a result, the lower outer flap 32 comes into contact with the inner flap 33 from the outside, but the two are not glued together, and the lower outer flap 32 holds the inner flap 33 in an unfixed state.

[0056] Next, adhesive G (see Figure 2) is applied to the outer surface of the lower outer flap 32, the upper outer flap 31 is folded downward along the upper outer flap fold line b1, and the inner surface of the upper outer flap 31 is fixed to the outer surface of the lower outer flap 32 via adhesive G. As a result, the open end of the body portion 2 is closed, and the closed portion 3 is formed.

[0057] With the above steps completed, the assembly of the packaging box 1 containing the product is finished, and the packaging box 1 in the state shown in Figure 1 is completed.

[0058] Next, the opening procedure for the packaging box 1 of the first embodiment will be explained with reference to Figures 3 to 5. Note that in Figures 3 and 4, the product is omitted for ease of understanding.

[0059] First, we will explain the process of opening the top panel 4 of packaging box 1.

[0060] First, the worker inserts their finger into the break-start section 8 of the unopened packaging box 1 shown in Figure 1. As a result, the top panel 4 is broken along the central first door breakable line 42a and the hand hole breakable line 81, and is folded along the hand hole fold line e, opening the break-start section 8.

[0061] Next, the worker places their fingers on the break initiation point 8 and pulls the door sections 7 apart from each other. As a result, the top panel 4 breaks along the door break line 41 (specifically, in the order of the right first door break line 42b, the left first door break line 42c, and the second door break line 43). Furthermore, the top panel 4 is folded along the door fold line d connecting both ends of the door break line 41.

[0062] As a result, the top panel 4 is opened, and a part of the packaging box 1 (the top panel 4) is opened.

[0063] Secondly, the process of opening the packaging box 1 up to the closure section 3 will be explained.

[0064] With the top panel 4 of the packaging box 1 open, the worker pulls the front door section 7 further forward in Figure 4. This causes the remaining front portion of the top panel 4 (the area between the door section 7 and the upper outer flap fold line b1) to break along the pair of openable breakable lines 44 on the front side. As a result, the front half of the top panel 4 is removed from the packaging box 1.

[0065] The removed top panel 4 has an upper outer flap 31 attached to it via an upper outer flap fold line b1, and a lower outer flap 32 is fixed to the inner surface of the upper outer flap 31. On the other hand, the lower outer flap 32 is not fixed to the inner flap 33. Therefore, the top panel 4, the upper outer flap 31, and the lower outer flap 32 can rotate together along the lower outer flap fold line b2. The inner flap 33 can be folded back along the inner flap fold line c now that the lower outer flap 32, which it was in contact with on the outside, has been removed.

[0066] As a result, the packaging box 1 is opened not only to the top panel 4 but also to the closing section 3.

[0067] Thirdly, we will describe the process of unpacking packaging box 1 for disposal.

[0068] With the top panel 4 and the front closing section 3 of the packaging box 1 open, the worker pulls the rear door section 7 in Figure 4 further back. This causes the remaining rear portion of the top panel 4 (the area between the door section 7 and the upper outer flap fold line b1) to break along the pair of openable breakable lines 44 on the front side. As a result, the rear half of the top panel 4 is removed from the packaging box 1. The removed top panel 4 is then rotated integrally with the upper outer flap 31 and the lower outer flap 32 along the lower outer flap fold line b2, as described above.

[0069] Furthermore, the pair of side panels 6 can be folded back along the body fold line a, since the lower outer flap 32, which was supported by the top panel 4 and inner flap 33 that supported them, has been removed.

[0070] As a result, the packaging box 1 unfolds into a roughly cross shape centered on the bottom plate 5.

[0071] Next, the operation and effects of the packaging box 1 of the first embodiment will be described.

[0072] In the first embodiment of the packaging box 1, the second door breakable line 43 that constitutes the door portion 7 coincides with and extends along the body fold line a, so when folding the corrugated cardboard 1x along the body fold line a to create the body portion 2, it is possible to prevent the top panel 4 from accidentally folding along the second door breakable line 43 formed in another location.

[0073] Similarly, the right first door breakable line 42b and the left first door breakable line 42c extend parallel to each other, but by sandwiching the central first door breakable line 42a, the first door breakable line 42 as a whole has a gentle crank shape and is not in a straight line, which prevents it from being accidentally broken when the body 2 is made.

[0074] In the first embodiment, the packaging box 1 is formed such that the width of the inner flap 33 and the height (vertical length in Figure 2) of the upper outer flap 31 and lower outer flap 32 are approximately the same or of the same size. As a result, the closure section 3 is almost completely sealed by the upper outer flap 31 and lower outer flap 32, making it difficult for dust and debris to enter the interior. Furthermore, the lower outer flap 32 can support the top panel 4, thereby increasing the rigidity of the box.

[0075] According to the packaging box 1 of the first embodiment, the door sections 7 can be opened and the top panel 4 opened simply by pulling them up in a direction that separates them from each other. In this case, the packaging box 1 of the first embodiment has break-start sections 8 formed on the tip side of each door section 7, and fingers can be inserted when opening, making it easy to grip the door section 7 and pull it open.

[0076] Furthermore, since a door fold line d is formed along the base end of the door section 7, it folds there when the door section 7 is pulled up, preventing the top panel 4 from being accidentally cut all the way to the corners.

[0077] In the packaging box 1 of the first embodiment, only the top panel 4 can be opened. Since only the top panel 4 is open, the four sides of the packaging box 1 are surrounded by a pair of side panels 6 and a pair of closing parts 3. Therefore, even if the products are prone to collapsing when stacked, it is possible to prevent the products from spilling out unintentionally, and the products can be displayed in this state.

[0078] Furthermore, since the second door breakable line 43, which constitutes the door section 7, extends along the upper left and right edges of the top panel 4, the entire top panel 4 can be opened in the left-right direction. As a result, the top panel 4 is opened wide, making it easy to take out products.

[0079] Furthermore, it is possible to remove some of the products from the packaging box 1, display them on a shelf or elsewhere, and then reseal the packaging box 1 by closing the door section 7.

[0080] According to the packaging box 1 of the first embodiment, the box can be opened up to the closure section 3 by simply pulling one of the door sections 7. This allows, for example, when transferring ice pops to a freezer with an open top, the entire contents of the box can be poured out at once by tilting the packaging box 1. In particular, the direction of force applied (the pulling direction) is generally the same when opening the top panel 4 and when opening up to the closure section 3, making it easy to handle.

[0081] Furthermore, in the packaging box 1 of the first embodiment, the other door section 7 can also be pulled to open the other closing section 3. In the packaging box 1 of the first embodiment, since the pair of door breakable lines 41 overlap at the first door breakable line 42, when the top panel 4 is broken along the door breakable line 41 and the opening breakable line 44, there is no longer a point to connect the pair of side panels 6 on the top panel 4, so the pair of side panels 6 can be folded back along the body fold line a to form a flat panel for disposal. Therefore, the fully unfolded packaging box 1 is not bulky as a waste item.

[0082] Furthermore, since the door section 7, which has been removed from the top panel 4, is connected to the lower outer flap 32 via the upper outer flap 31 and adhesive G, the fully unfolded packaging box 1 can have a waste quantity of "1".

[0083] [Second Embodiment] A packaging box 20 according to a second embodiment of the present invention will be described with reference to Figures 6 to 10. Parts substantially identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted. More specifically, the packaging box 20 according to the second embodiment differs from the first embodiment in the configuration of the fold lines and breakable lines formed on the top plate 4 and the upper outer flap 31; this difference will be explained below.

[0084] As shown in Figure 7, an upper outer flap fold line b1 is formed along the boundary line between the top panel 4 and the upper outer flap 31 in the corrugated cardboard 20x. The middle portion of this upper outer flap fold line b1, excluding the left and right ends, corresponds to the door fold line 2d in the second embodiment. In other words, the door fold line 2d is formed along the upper outer flap fold line b1, in the middle portion of the upper outer flap fold line b1.

[0085] The top panel 4 has a pair of door breakable lines 241 that connect both ends of the door fold line 2d. The door breakable line 241 has a first door breakable line 242 that connects the left and right ends of the top panel 4, a pair of second door breakable lines 243a that extend from both ends of the first door breakable line 242 along the left and right ends of the top panel 4, and a pair of third door breakable lines 243b that extend in a straight line inclined toward each other from the tips of the second door breakable lines 243a to the ends of the door fold line 2d. In the second embodiment, the first door breakable line 242 extends parallel to the upper and lower ends of the top panel 4.

[0086] The upper outer flap 31 is provided with a pair of openable breakable lines 244 extending from the end of the door breakable line 241 (the end of the third door breakable line 243b on the side where the second door breakable line 243a is not connected) to the side edge of the upper outer flap 31. The pair of openable breakable lines 244 extend in a straight line, inclined in a direction away from each other. The third door breakable line 243b and the openable breakable line 244 are connected at approximately a right angle. The adhesive G should not be applied to the triangular area enclosed by the openable breakable line 244 and the corner of the upper outer flap 31; therefore, it is preferable to apply it closer to the center of the upper outer flap 31 than the triangular area.

[0087] Next, the opening procedure for the packaging box 20 of the second embodiment will be explained with reference to Figures 8-10. Note that in Figures 8 and 9, the product is omitted for the sake of clarity.

[0088] First, we will explain the process of opening the top panel 4 of the packaging box 20.

[0089] First, the worker inserts their finger into the break-start section 8 of the unopened packaging box 1 shown in Figure 6. As a result, the top panel 4 is broken along the center of the first door breakable line 242 and the hand-hole breakable line 81, and is folded along the hand-hole fold line e, opening the break-start section 8.

[0090] Next, the worker places their fingers on the starting point 8 of the break and pulls the door sections 7 apart from each other. As a result, the top panel 4 is broken along the door break lines 41 in the order of the first door break line 242, the second door break line 243a, and the third door break line 243b. Furthermore, the top panel 4 is folded back along the door fold line 2d connecting the two ends of the door break line 41 and stands upright.

[0091] As a result, the top panel 4 is opened, and the pair of door sections 7 are opened, so that almost the entire surface of the top panel 4 of the packaging box 20 is opened. More specifically, only the triangular area enclosed by the third door breakable line 243b and the corner of the top panel 4 remains uncut, and this area becomes the crossbar section 245.

[0092] Secondly, the process of opening the packaging box 20 up to the closure section 3 will be explained.

[0093] With the top panel 4 of the packaging box 1 open, the worker pulls the front door section 7 further forward as shown in Figure 8. As a result, as shown in Figure 9, the front upper outer flap 31, which is connected to the front door section 7 via the upper outer flap fold line b1, breaks along the pair of breakable lines 244, and the top panel 4, upper outer flap 31, and lower outer flap 32 rotate together along the lower outer flap fold line b2.

[0094] As a result, the packaging box 20 is opened not only to the top panel 4 but also to the closing section 3.

[0095] Thirdly, the process of unfolding the packaging box 20 for disposal is the same as that of the packaging box 1 in the first embodiment, so the explanation will be omitted. The unfolded packaging box 20 unfolds into a roughly cross shape centered on the bottom plate 5, as shown in Figure 10.

[0096] Next, the operation and effects of the packaging box 20 of the second embodiment will be described. Note that the operation and effects that are substantially the same as those of the first embodiment will not be described.

[0097] In the packaging box 20 of the second embodiment, the middle portion of the upper outer flap fold line b1 is used as the door fold line 2d, so there is no need to separately provide a door fold line on the top panel 4. Also, since the upper outer flap fold line b1 is folded during box manufacturing, if the top panel 4 is broken along the door breakable line 241, the door section 7 will stand up simply by folding it back along the door fold line 2d, so there is no need to deliberately create a crease along the door fold line 2d when opening the door section 7.

[0098] Furthermore, in the packaging box 20 of the second embodiment, almost the entire surface of the top panel 4, excluding the corner supports 245, is opened, making it easy to remove the product. Because the corner supports 245 are formed, the packaging boxes 20 with the top panel 4 opened can be stacked vertically.

[0099] [Third Embodiment] Referring to Figure 11, the third and fourth embodiments of the present invention will be described using corrugated cardboard 30x. Specifically, the third embodiment will be described using the area near the upper end of the top plate 4 as shown in Figure 11, and the fourth embodiment will be described using the area near the lower end of the top plate 4. Parts substantially identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0100] First, looking at the area near the top edge of the top panel 4 made of corrugated cardboard 30x, the width of the upper outer flap 331 is designed to be smaller than the width of the top panel 4. As a result, the upper edge of the top panel 4 has open edges on both the left and right ends where the upper outer flap 331 is not attached.

[0101] The pair of upper open breakable wires 344 extend inclined on the inside of the top plate 4, moving closer to each other, from the end of the door breakable wire 41 (the end of the second door breakable wire 43 on the side where the first door breakable wire 42 is not connected) to the open edge.

[0102] Even with the packaging box of the third embodiment having such a configuration, if the top plate 4 is removed, the upper outer flap 31 and the lower outer flap 32 rotate integrally, so the same functions and effects as the packaging box 1 of the first embodiment can be achieved.

[0103] On the other hand, looking at the area near the lower end of the top panel 4 made of corrugated cardboard 30x, the width of the inner flap 433 is designed to be smaller than the width of the side panel 6. As a result, an open edge is formed at the lower edge of the side panel 6 where the inner flap 433 is not connected to the end on the top panel 4 side.

[0104] The lower pair of open breakable wires 444 extend inclined from the end of the door breakable wire 41 (the end of the second door breakable wire 43 on the side to which the first door breakable wire 42 is not connected) to the open edge of the side plate 6 (including the adhesive piece 9 fixed to the side plate 6).

[0105] Even with the packaging box of the fourth embodiment having such a configuration, if the top plate 4 is removed, the upper outer flap 31 and the lower outer flap 32 rotate integrally, so the same functions and effects as the packaging box 1 of the first embodiment can be achieved.

[0106] In other words, according to the third and fourth embodiments of the present invention, the open breakable line 44 does not necessarily have to extend toward the corner of the top plate 4, but only needs to reach the area between the upper outer flap 31 and the inner flap 33 of the upper and lower edges of the top plate 4 and the side plate 6, that is, the open edge where the upper outer flap 31 and the inner flap 33 are not provided.

[0107] [Differentiation] In the above embodiment, corrugated cardboard was used as an example material, but the material may be cardboard or a thin synthetic resin sheet, as long as it can be folded and assembled and can be broken along the breakable line.

[0108] In the above embodiment, the body portion 2 was described as a rectangular tube, but the body portion 2 may be a pentagonal tube, a hexagonal tube, or the like, as long as it is rectangular.

[0109] In the above embodiment, the case in which the body portion 2 extends laterally and breaks the top plate 4 was described as an example. However, the packaging box of the present invention can also be used upright with the body portion 2 extending vertically, in which case one of the four side plates will be broken.

[0110] In the above embodiment, a case in which the top plate 4 has a pair of door sections 7 was described as an example, but there is no limit to the number of door sections 7, and one may be used. Also, there is no limit to the shape of the fracture initiation section 8, and it may be omitted.

[0111] In the above embodiment, a case in which one closing section 3 is composed of an upper outer flap 31 and a lower outer flap 32 was described as an example, but the upper outer flap 31 and the lower outer flap 32 may be made up of only one of them. For example, if only the upper outer flap 31 is provided and the lower outer flap 32 is omitted, for example, an insertion piece can be provided at the tip of the upper outer flap 31 via an insertion fold line, and the closing section 3 can be formed by inserting it into the gap between the bottom plate 5 and the inner flaps 33, 33.

[0112] Even with this configuration, if the door 7 is pulled to break the top plate 4, the insertion piece at the tip of the upper outer flap 31 connected to the top plate 4 is removed from the gap between the bottom plate 5 and the inner flaps 33, 33, and the door 7 and the upper outer flap 31 are removed as a single unit, thus achieving the same function and effect as packaging box 1 and packaging box 20. Conversely, even if only the lower outer flap 32 is provided and the upper outer flap 31 is omitted, when the door 7 is removed from the top plate 4, the insertion piece at the tip of the lower outer flap 32 is released from its pinched state, and the closure 3 can be opened.

[0113] In the above embodiment, the upper outer flap 31 and the lower outer flap 32 were described as being designed to overlap each other over almost the entire height. However, since it is sufficient for the upper outer flap 31 and the lower outer flap 32 to be fixed (adhered) to each other, they may overlap only at a portion of their tips.

[0114] In the above embodiment, an example was described in which inner flaps 33 are provided at the upper and lower ends of the side plate 6 as shown in Figures 2, 7, and 11. However, there are no limitations on the shape of the inner flaps 33, and they may be omitted.

[0115] In the above embodiment, the door fold line d was described as extending parallel to the upper outer flap fold line b1 as an example. However, the door fold line d may also extend at an angle to the upper outer flap fold line b1. By adding a breakable line in the center of the door section 7 in the left-right direction and dividing each door section 7 into two, it can also be made to extend in a V-shape.

[0116] In the above embodiment, a bent door breakable line 41 was described as an example, but the door breakable line 41 may be curved or meandering. In other words, the door breakable line 41 does not need to connect the left and right ends of the top plate 4, nor does it need to be formed along the left and right ends of the top plate 4.

[0117] In the above embodiment, the example was described in which the pair of door breakable lines 41 completely overlap at the first door breakable line 42 (242). However, the pair of door breakable lines 41 may be touching at one point, or they may be spaced apart from each other and not touching.

[0118] In the above embodiment, the breakable line 44 (244, 344, 444) was described as being straight, but the breakable line 44 may be bent, curved, or meandering. Also, in the second embodiment, the breakable line 244 was described as reaching the side end of the upper outer flap 31, but the breakable line 244 may reach the upper end of the upper outer flap 31 as long as it passes outside the area where the adhesive G is applied.

[0119] In the above embodiment, the inner surface of the adhesive piece 9 was described as being fixed to the outer surface of the side plate 6 via adhesive G, but the outer surface of the adhesive piece 9 may be bonded to the inner surface of the side plate 6. Similarly, in the above embodiment, the inner surface of the upper outer flap 31 was described as being fixed to the outer surface of the lower outer flap 32 via adhesive G, but the upper outer flap 31 may be folded first, and the inner surface of the lower outer flap 32 may be bonded to the outer surface of the upper outer flap 31.

[0120] In the above embodiment, adhesive was described as an example of a means of fixing, but staples or adhesive tape may also be used as means of fixing. [Explanation of symbols]

[0121] 1,20 packaging box 2 Torso 3 Occlusion 4 Top plate 5 Bottom plate 6 Side panels 31,331 Upper outer flap (outer flap) 32 Lower outer flap (outer flap) 33,433 Inner flap 41,241 Door breakage possible wire 42,242 First door breakable line 43,243a Breakable line for the second door 243b Third door breakable line 44,244,344,444 Open breakable wire a. Fold line on the body b1 Top outer flap fold line (outer flap fold line) b2 Lower outer flap fold line (outer flap fold line) c. Inner flap fold line d,2d Door fold line

Claims

1. A packaging box having a rectangular tubular body and a closing part that closes the open end of the body, The body is constructed such that a top plate, a bottom plate facing the top plate, and side plates connecting the top plate and the bottom plate are connected via fold lines in the body. The top plate and the bottom plate are connected to the outer flap at both ends of the open end of the body via an outer flap fold line. The side plate has inner flaps connected to both ends of the open end of the body via inner flap fold lines. The closing portion is closed by the inner flap which is folded inward along the inner flap fold line, one outer flap connected to the top plate and the bottom plate which is folded inward along the outer flap fold line and is not fixed to the inner flap in a state where it is in contact with the inner flap from the outside, and an outer flap connected to the other of the top plate and the bottom plate which is folded inward along the outer flap fold line and is fixed to the non-fixed outer flap in a state where it is in contact with the non-fixed outer flap from the outside, The top panel is provided with a door fold line extending along the outer flap fold line, a door breakable line connecting both ends of the door fold line and extending convexly away from the outer flap fold line, and an open breakable line extending from the end of the door breakable line to the corner of the top panel adjacent to the end of the door breakable line or to the edge of the outer flap adjacent to the end of the door breakable line. The packaging box is characterized in that the top panel has a door fold line, a door breakable line, and an open breakable line at each of the two ends on the open end side of the body, and the two door breakable lines are in contact at least in part.

2. In the packaging box according to claim 1, The packaging box is characterized in that the door breakable line comprises a first door breakable line connecting the side edges of the top plate, and a pair of second door breakable lines extending from both ends of the first door breakable line along the side edges of the top plate.

3. In the packaging box according to claim 1 or 2, A packaging box characterized in that the door fold line extends along the outer flap fold line while maintaining a predetermined distance from the outer flap fold line.

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