Packing box

Abstract

To provide a packaging box which can prevent articles from unintentionally spilling out while having advantages of traditional packaging boxes.SOLUTION: A packaging box 1 has a rectangular parallelepiped shape and is of a so-called wrap-around case type. A lower outer flap 32 that comes in contact with an inner flap 33 from the outside is not fixed to the inner flap 33, and an upper outer flap 31 that comes in contact with a lower outer flap 32 from the outside is bonded to the lower outer flap 32. A top plate 4 is provided with a door crease line d formed in the middle along a body crease line a, and a door breakable line 41 extending in a convex shape connecting both ends of the door crease line d. Side plates are provided with open breakable lines 61 extending in a V-shape from the end of the door breakable line 41 to the corners of the adjacent top plate 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 wrap-around 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 connected so as to bend inward from the left and right end portions of the front plate, and a pair of second inner flaps connected so as to bend inward from the left and right end portions of the rear plate.

[0004] In addition, this packaging box is connected 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 connected so as to bend inward from the left and right end portions of the top plate and fixed in a state of being in contact with the pair of first outer flaps from the outside, respectively.

[0005] 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 corner portions on the front plate side of the top plate and extends convexly toward the rear plate side.

[0006] Thereby, when the packaging box is opened, 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 and in contact with the inner flap from the outside and does not touch the inner flap The door is closed by a fixed outer flap 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 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 formed in the middle of the length of the body fold line along the body fold line, and a door breakable line extending convexly from both ends of the door fold line, and at least one of the top plate and the side plate in contact with the door fold line is provided with an open breakable line extending from the end of the door breakable line to an area sandwiched between the outer flap connected to the top plate and the inner flap connected to the side plate, which is adjacent to the end of the open end of the body.

[0012] In the first packaging box of the present invention, the top panel is provided with a door fold line formed midway along the body fold line in the longitudinal direction, and a door breakable line extending convexly from both ends of the door 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 area") 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, when the door is opened and only the top panel is opened, an unbroken portion of the top panel remains, extending from the door fold line towards both ends of the outer flap fold line. Therefore, when stacking the opened packaging boxes, they can be stacked using this unbroken top panel. In addition, the closing section maintains an upright position even when the top panel is opened, because the outer flap on the top panel side is connected to the side panel via the aforementioned unbroken top panel.

[0015] In contrast, in the first packaging box of the present invention, an openable breakable line is provided on at least one of the top panel and the side panel adjacent to the door fold line, extending from the end of the door breakable line to one end of the body adjacent to the end of the open end, in an area sandwiched between the outer flap connected to the top panel and the inner flap connected to the side panel.

[0016] Therefore, when broken along the breakable line, the outer flap on the top panel side and the side panel, which were connected, are separated. Since both outer flaps are not fixed to the inner flap, the outer flap on the top panel side and the inner flap on the bottom panel side, which was fixed to it, can rotate together along the fold line of the outer flap on the bottom panel side. The inner flap, from which the outer flap that it was in contact with on the outside has been removed, can then be folded back along the fold line of the inner flap.

[0017] Therefore, according to the first packaging box of the present invention, not only the top panel but also the closing part can be opened.

[0018] The second 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, and an outer flap is attached to both ends of the open end side of the body via an outer flap fold line, and the outer flap has an insertion piece at its tip via an insertion fold line, and an inner flap is attached to both ends of the open end side of the body via an inner flap fold line, and the closing part is an inner flap that is folded inward along the inner flap fold line and an outer flap that is folded inward along the outer flap fold line The door is closed by an outer flap that is not fixed to the inner flap and is in contact with the wrap from the outside, and an 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, and the top plate is provided with a door fold line formed in the middle of the length of the body fold line along the body fold line, and a door breakable line extending in a convex shape connecting both ends of the door fold line, and at least one of the top plate and the side plate in contact with the door fold line is provided with an open breakable line that extends from the end of the door breakable line to an area sandwiched between the outer flap connected to the top plate and the inner flap connected to the side plate, which is adjacent to the end of the open end of the body.

[0019] In the second packaging box of the present invention, the procedure and operation / effect of opening the top panel are the same as those of the first packaging box.

[0020] On the other hand, if an outer flap is attached to the top panel, when the top panel is broken along the breakable line, the insertion piece at the tip of the outer flap connected to it is also removed from the gap between the bottom panel and the inner flap, and the removed top panel and outer flap are 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.

[0021] Similarly, when an outer flap is continuously provided on the bottom plate, when the broken top plate is removed, the insertion piece at the tip of the outer flap is released from the state of being sandwiched in the gap between the top plate and the inner flap. Therefore, the outer flap can be folded back along the outer flap fold line, and the inner flap can be folded back along the inner flap fold line. According to the second packaging box, the closing part is opened.

[0022] Therefore, according to the second packaging box, not only the top plate but also the closing part can be opened.

[0023] In the first packaging box and the second packaging box of the present invention, it is preferable that the openable breakable line is provided on the side plate.

[0024] In the packaging box of the present invention, after a part of the top plate is opened by pulling the outside of the packaging box, and then the removed top plate is pulled to the outside of the packaging box, the side plate continuously provided on the removed top plate is rotated outward along the body fold line a provided at the boundary line with the bottom plate. Therefore, a force tending to displace outward and downward and a force pulling in the opposite direction by the remaining top plate are generated on the side plate, and the side plate is sheared along the openable breakable line.

[0025] Therefore, according to the packaging box provided with the openable breakable line on the side plate, since the direction of applying force when opening the top plate and the direction of applying force when opening the closing part are generally the same, it is easy to handle.

[0026] Further, in the packaging box having this configuration (the openable breakable line is provided on the side plate), it is preferable that the openable breakable line has a descending breakable line connected to the end of the door breakable line and extending toward the bottom plate.

[0027] In this packaging box, a descending breakable line extending from the upper end of the side plate (the end of the door breakable line) toward the bottom plate is provided at the starting point of the generally difficult-to-cut open breakable line. Since the direction in which this descending breakable line extends (from top to bottom) coincides with the direction in which the upper end of the side plate moves when the side plate rotates outward along the body fold line a, it is easily sheared by the rotation of the side plate.

[0028] Therefore, according to the packaging box having a descending breakable line, it is easy to create a trigger for breaking the open breakable line.

[0029] Furthermore, in the packaging box having this configuration (with a descending breakable line), it is preferable that an auxiliary fold line is provided on the side plate on the extension line of the descending breakable line.

[0030] According to this packaging box, when the removed top plate is pulled outward from the packaging box, the side plate connected to the removed top plate is curved or bent convexly outward by the descending breakable line and the auxiliary fold line.

[0031] Therefore, according to the packaging box having an auxiliary fold line, the side plate can be tilted further outward, so it is easy to shear the descending breakable line from the inside to the outside of the side plate by a pulling force in the vertical direction.

[0032] In the packaging box having this configuration (with a descending breakable line), it is preferable that the open breakable line has an ascending breakable line connected to the descending breakable line and extending toward the top plate.

[0033] The open breakable line needs to extend to the position of the open end of the body, which is the gap where the inner flap and the outer flap are not provided. Therefore, if the open breakable line is formed only by the descending breakable line, the inner flap needs to be designed to have a width that separates from the top plate.

[0034] In contrast, a packaging box with this configuration has an upward breakable line after the downward breakable line, allowing the width of the inner flap to be increased and brought closer to the top panel. Therefore, this configuration can increase the rigidity of the packaging box.

[0035] In the first and second packaging boxes of the present invention, the top panel preferably has a door breakable line at each of the open end sides of the body, and the two door breakable lines are preferably in contact with each other in some respects.

[0036] 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.

[0037] Furthermore, by breaking the top panel along both breakable lines, both closed sections can be opened. Also, since the breakable lines on both doors are in contact in part, the top panel is separated by the breakable lines on both doors. In other words, the side panels are not connected by the remaining top panel, and can therefore rotate along the fold line on the bottom panel side of the body.

[0038] Therefore, with a packaging box having this configuration, the packaging box can be fully unfolded, reducing the number of waste items to "1". In addition, since the fully unfolded packaging box returns to a flat state, the waste items can be made less bulky.

[0039] Incidentally, conventional packaging boxes (see Patent Document 1) have a structure in which approximately half of the top panel is cut off, which presents the problem that the entire top panel cannot be opened.

[0040] To solve the above problem, 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, and flaps are connected to at least one of the top plate, the bottom plate and the side plate at both ends on the open end side via flap fold lines, and the closing part is closed when the flaps are folded inward along the flap fold lines. The top plate is provided with a door fold line formed midway along the body fold line in the longitudinal direction of the body fold line at each end of the open end of the body, and a door breakable line extending convexly from both ends of the door fold line, and both door breakable lines are formed to be in contact with each other at least in part, and the side plate in contact with the door fold line is provided with an open breakable line extending from the end of the door breakable line to the side end of the side plate adjacent to the end, where the flap is not connected.

[0041] In the third packaging box of the present invention, the top panel is provided with a door fold line formed midway along the body fold line in the longitudinal direction, and a door breakable line extending convexly from both ends of the door 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 area") 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.

[0042] In particular, in the third packaging box of the present invention, both closures can be opened by breaking the top panel at both openable breakable lines, and since the breakable lines on both doors are in contact in part, the top panel is completely opened in the direction in which it is sandwiched between the side panels.

[0043] At this point, an unbroken top panel remains, extending from the door fold line towards both ends of the outer flap fold line. The unbroken top panel maintains its horizontal position through the flaps or side panels connected to it.

[0044] In contrast, in the third packaging box of the present invention, an open-break line extends from the end of the door-break line to the area of ​​the side edge of the side panel where there is no flap. Therefore, when the side panel is broken along this open-break line, the unbroken top panel is removed from the packaging box or, having been separated from the side panel, is rotated outward from the packaging box by the flap fold line. As a result, the top panel is completely opened in the direction in which it is sandwiched between both closing parts.

[0045] Therefore, according to the third packaging box of the present invention, the entire top surface can be opened. [Brief explanation of the drawing]

[0046] [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 a packaging box according to the first embodiment in the process of opening the sealed section. [Figure 5] This is a perspective view showing the packaging box according to the first embodiment when the closure is opened. [Figure 6] This is a plan view showing the packaging box according to the first embodiment after unfolding. [Figure 7] This is a plan view showing the configuration of a packaging box according to a second embodiment of the present invention before assembly. [Figure 8] This is a perspective view showing the appearance of a packaging box according to the third embodiment of the present invention. [Modes for carrying out the invention]

[0047] [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.

[0048] 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.

[0049] The top panel 4 has a pair of door sections 7 that rotate toward the side panel 6 when opened. Each door section 7 has a break-starting section 8 formed at the tip of the door section 7 for inserting fingers when opened.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] The top panel 4 has a door fold line d that runs along the body fold line a. The door fold line d is formed in the middle section of the body fold line a, excluding the upper and lower ends. However, this does not mean that the door fold line d is formed separately from the body fold line a, but rather that the middle section of the body fold line a, excluding the upper and lower ends, corresponds to the door fold line d.

[0056] 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 door fold line d and are formed in a roughly inverted T shape in the first embodiment. The door section 7 described above is formed by the door fold line d and the door breakable lines 41 connecting both ends.

[0057] The door breakable line 41 has a first door breakable line 42 connecting the upper and lower 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 to the end 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.

[0058] The second door breakable line 43 includes a central first door breakable line 43a extending from the end of the first door breakable line 42 along the upper and lower edges of the top plate 4, a lateral first door breakable line 43b extending parallel to the upper and lower edges of the top plate 4 from the end of the door fold line d, and a connecting first door breakable line 43c extending in a straight line connecting the central first door breakable line 43a and the lateral first door breakable line 43b.

[0059] The top panel 4 is provided with a pair of hand-hole fold lines e that sandwich the central part of the first door breakable line 42 in the vertical direction from the left and right directions. The hand-hole fold lines e are formed parallel to the first door breakable line 42.

[0060] The top panel 4 is provided with hand-hole breakable lines 81 that extend in an arc from the upper and lower ends of the hand-hole fold line e to the first door breakable line 42. The breakable starting section 8 described above is formed by one hand-hole fold line e and a pair of hand-hole breakable lines 81 extending from both ends of it.

[0061] The side panels 6 (and adhesive pieces 9) are provided with a roughly inverted V-shaped openable breakable line 61 that extends from the end of the door breakable line 41 (the end of the first lateral door breakable line 43b that is in contact with the door fold line d) to the corner of the adjacent top panel 4. Here, the corner of the top panel 4 refers to the position reached by the openable breakable line 61 when the box is manufactured. More precisely, in the flat state shown in Figure 2, the openable breakable line 61 of the rightmost side panel 6 extends to the corner of the side panel 6.

[0062] The open breakable wire 61 is connected to the end of the door breakable wire 41 and has a downward breakable wire 61a that extends toward the bottom plate 5, and an upward breakable wire 61b that is connected to the downward breakable wire 61a and extends toward the top plate 4.

[0063] The side plate 6 (and adhesive piece 9) is provided with an auxiliary fold line 62 that extends from the tip of the downward breakable line 61a to the adjacent inner flap fold line c. The auxiliary fold line 62 is formed on the extension of the downward breakable line 61a.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] Next, the opening procedure for the packaging box 1 of the first embodiment will be explained with reference to Figures 3 to 6. Note that in Figures 3 and 4, the product is omitted for the sake of clarity.

[0072] First, we will explain the process of opening the top panel 4 of packaging box 1.

[0073] 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 center of the first door breakable line 42 in the vertical direction and along the hand-hole breakable line 81, and is folded along the hand-hole fold line e, opening the break-start section 8.

[0074] 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 first door break line 42, the central first door break line 43a, the connecting first door break line 43c, and the lateral first door break line 43b). Furthermore, the top panel 4 is folded back along the door fold line 2d connecting both ends of the door break line 41 and stands upright.

[0075] As a result, the top panel 4 is opened, and a part of the packaging box 1 (the top panel 4) is opened.

[0076] As a result, the top panel 4 is opened, and a large portion of the top panel 4 of the packaging box 1 is opened. More specifically, only a rectangular area enclosed by the connecting first door breakable line 43c and the lateral first door breakable line 43b and the corner of the top panel 4 remains uncut, and this area becomes the crossbar 44.

[0077] Secondly, we will explain the process of opening the packaging box 1 up to the side panel 6.

[0078] With the top panel 4 of the packaging box 1 open, the worker pulls the right-side door 7 in Figure 4 further to the right. As a result, the right-side panel 6, which is connected to the right-side door 7 via the door fold line d, is also pulled to the right. At this time, since the side panel 6 is connected to the bottom panel 5 by the body fold line a, it rotates along the body fold line a, and consequently, the side panel 6 is subjected to a pulling force outward and downward from the perspective of the packaging box 1.

[0079] However, since the upper corner of the side plate 6 is connected to the rail 44, a force in the opposite direction is generated on the side plate 6 that tries to resist this tensile force. As a result, as shown in Figure 5, the side plate 6 is broken by shear force at the breakable line 61 sandwiched between the rail 44 and the base end of the door 7 (door fold line d).

[0080] As a result, the door section 7 and the side panel 6 rotate along the fold line a of the body, which is sandwiched between the side panel 6 and the bottom panel 5. At the same time, the pair of inner flaps 33 that were connected to the side panel 6 rotate together with the side panel 6 because they are not fixed to the lower outer flap 32 that was supported by their outer surface.

[0081] Incidentally, until the side panel 6 is broken at the breakable line 61, the inner flap 33 is also held down from above by the remaining part (crossbar 44) of the top panel 4 that is connected to the side panel 6, so the rotation of the side panel 6 is also restricted by the top panel 4 via the inner flap 33.

[0082] However, when the side panel 6 is broken along the breakable line 61, the remaining part of the top panel 4 (the crossbar 44) is not connected except along the upper outer flap fold line b1. As shown in Figure 5, it is pushed aside by the rotating inner flap 33 and folded back along the upper outer flap fold line b1. Therefore, when the side panel 6 is broken along the breakable line 61, the remaining part of the top panel 4 (the crossbar 44) does not hinder the rotation of the side panel 6 and the inner flap 33.

[0083] As a result, packaging box 1 is opened not only on the top panel 4 but also on the side panels 6.

[0084] Thirdly, we will describe the process of unpacking packaging box 1 for disposal.

[0085] With the top panel 4 and the right side panel 6 of the packaging box 1 open, the worker pulls the left door section 7 further to the left in Figure 5. As a result, the left side panel 6 is broken at the breakable line 61, and the door section 7, the left side panel 6, and the pair of inner flaps 33 are rotated along the body fold line a, which is sandwiched between the left side panel 6 and the bottom panel 5.

[0086] As a result, the packaging box 1 unfolds into a roughly cross shape centered on the bottom plate 5.

[0087] Next, the operation and effects of the packaging box 1 of the first embodiment will be described.

[0088] 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.

[0089] 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 the pair of door sections 7 apart 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.

[0090] In the packaging box 1 of the first embodiment, the middle of the body fold line a is used as the door fold line d. Since the body fold line a is folded during box manufacturing, if the top panel 4 is broken along the door breakable line 41, the door section 7 will stand up simply by folding it back along the door fold line d. Therefore, there is no need to create a crease along the door fold line d when opening the door section 7.

[0091] 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.

[0092] Furthermore, in the packaging box 1 of the first embodiment, almost the entire surface of the top panel 4, excluding the corner supports 44, is opened, making it easy to remove the product. Because the corner supports 44 are formed, the packaging boxes 20 with the top panel 4 opened can be stacked vertically.

[0093] 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.

[0094] According to the packaging box 1 of the first embodiment, one side panel 6 can be opened simply by pulling one door 7. This allows, for example, when transferring ice pops to a freezer with an open top, the entire product can be poured in at once by tilting the packaging box 1. In particular, since the direction of force applied (the pulling direction) is generally the same when opening the top panel 4 and when opening the side panel 6, it is easy to handle.

[0095] Furthermore, in the packaging box 1 of the first embodiment, the side plate 6 is broken along the downward breakable line 61a from the top plate 4 towards the bottom plate 5, and then broken along the upward breakable line 61b from the bottom plate 5 towards the top plate 4. The downward breakable line 61a is prone to breaking from top to bottom towards the bottom plate 5 because a pulling force is generated outward and downward on the side plate 6, whereas the side plate 6 can be easily broken from bottom to top along the upward breakable line 61b due to a downward pulling force on the side plate 6. This is thought to be related to the following actions and effects.

[0096] In other words, when an outward pulling force is applied to the side plate 6 with the downward breakable line 61a broken, the side plate 6 is folded in a mountain fold along the upward breakable line 61b, and the side plate 6 is returned to an obtuse angle from a right angle to the crossbar 44 at its boundary line (body fold line a), and the side plate 6 is folded in a mountain fold along the auxiliary fold line 62, and the side plate 6 is returned to an obtuse angle from a right angle to the inner flap 33 at its boundary line (inner flap fold line c).

[0097] As a result, the upper corner of the side plate 6 is deformed into a square pyramidal shape with the tip of the upward-breaking line 61b as its apex. Consequently, the upward-breaking line 61b is positioned diagonally rather than on the same plane as most of the side plate 6 that is connected to and rotated by the door section 7. Therefore, the shear force on the upward-breaking line 61b of the side plate 6 is not applied equally to the entire surface at the same time, but rather the shear force gradually increases from the tip of the upward-breaking line 61b, allowing it to break smoothly from the tip towards the base.

[0098] Furthermore, in the packaging box 1 of the first embodiment, pulling the other door 7 allows the other side panel 6 to be opened as well. 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, there is no longer a point to connect the pair of closing parts 3 on the top panel 4, so the pair of closing parts 3 can be folded back along the lower outer flap fold line b2 to make a flat sheet for disposal. Therefore, the fully opened packaging box 1 is not bulky as a waste item.

[0099] Furthermore, of the top panel 4, the door section 7 is connected to the side panel 6 via the body fold line a, and the rail section 44, which is separated from the door section 7, is connected to the lower outer flap 32 via the upper outer flap 31 and adhesive G, so that the number of discarded items for the fully unfolded packaging box 1 can be "1".

[0100] [Second Embodiment] Referring to Figure 7, a second embodiment of the present invention will be described using corrugated cardboard 20x. Parts substantially identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0101] In the corrugated cardboard sheet 20x, the width of the inner flap 233 is designed to be smaller than the width of the side panel 6. As a result, open edges are formed at the top and bottom edges of the side panel 6, where the inner flap 233 is not connected to the edge on the top panel 4 side.

[0102] Furthermore, the upward breakable wire 261b of the open breakable wire 61 extends from the downward breakable wire 61a to the open end edge of the side plate 6 (including the adhesive piece 9 fixed to the side plate 6).

[0103] Even with the packaging box of the second embodiment having such a configuration, the side panel 6 can be separated from the remaining part of the top panel 4 (the crossbar 44) by pulling the door 7 outward, and the same function and effect as the packaging box 1 of the first embodiment can be achieved.

[0104] In other words, according to the second embodiment of the present invention, the open breakable line 61 only needs to be able to separate the side plate 6 from the rest of the top plate 4 (the crossbar portion 44), so it does not necessarily need to extend toward the corner of the top plate 4, and it is understood that it is sufficient for it 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, in short, the open edge where the upper outer flap 31 and the inner flap 33 are not provided.

[0105] [Third Embodiment] Referring to Figure 8, a packaging box 20 according to a third embodiment of the present invention will be described. Parts substantially identical to those in the first embodiment are denoted by the same reference numerals, and their descriptions are omitted.

[0106] The packaging box 20 according to the third embodiment differs from the first embodiment only in that the lower outer flap 32 and the inner flap 33 are fixed together via an adhesive G.

[0107] Next, the opening procedure for the packaging box 20 of the third embodiment will be explained with reference to Figure 8. Note that in Figure 8, the product is omitted for the sake of clarity.

[0108] First, the packaging box 20 of the third embodiment is no different from the packaging box 1 of the first embodiment up to the point where the pair of door sections 7 are lifted in a direction that separates them from each other, the door sections 7 are opened, and most of the top panel 4 is opened.

[0109] Next, when the worker pulls the right-side door 7 further to the right, the right-side panel 6 is pulled to the right and, similar to the packaging box 1 of the first embodiment, breaks at the breakable line 61, separating the remaining top panel 4 (bar section 44) from the side panel 6. As a result, the remaining two top panel 4 portions (bar sections 44) on the right side in Figure 8 can be raised or folded outward at the upper outer flap fold line b1.

[0110] Similarly, when the left door section 7 is pulled further to the left, the left side panel 6 is pulled to the left and breaks at the breakable line 61, and the remaining parts (sills 44) of the two top panels 4 on the right side of Figure 8 can be raised or folded outwards at the upper outer flap fold line b1.

[0111] Therefore, with the packaging box 20 of the third embodiment, it is possible to open not only a part of the top panel 4, but also the entire top panel 4, making it easier to take out the product.

[0112] [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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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. In particular, in the third embodiment, since it is sufficient for both the upper outer flap 31 and the lower outer flap 32 to be fixed to the inner flap 33 via adhesive G, they may be so-called short flaps in which the tips of the upper outer flap 31 and the lower outer flap 32 do not overlap each other.

[0118] In the above embodiment, an example was described in which inner flaps 33 are connected to the upper and lower ends of the side plate 6 in Figure 2. However, there are no limitations on the shape of the inner flaps 33, and in the first and second embodiments, the inner flaps 33 can be omitted.

[0119] In the above embodiment, the door section 7 was described as rotating only along the door fold line d, but the door fold line is not limited to one. For example, a second door fold line may be provided that connects the contact points of the lateral first door breakable line 43b and the connecting first door breakable line 43c in the vertical direction in Figure 2. This allows the size of the opening to be selected, such as opening the door section 7 slightly along the second door fold line or opening it more widely along the door fold line d.

[0120] 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 upper and lower ends of the top plate 4, nor does it need to be formed along the left and right ends of the top plate 4.

[0121] 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. 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.

[0122] In the above embodiment, the breakable wire 61 was described as being bent in a V-shape, but the breakable wire 61 may also be curved or meandering.

[0123] Furthermore, the breakable opening line 61 may extend in a straight line along the fold line a of the body (which is the side edge of the top plate 4 and also the upper edge of the side plate 6). Also, at least a portion of the breakable opening line 61b may extend in a straight line along the inner flap fold line c (the side edge of the side plate 6).

[0124] Furthermore, as explained using Figure 7, the breakable opening line 61 may extend in a straight line from the end of the breakable door line 41 to the open edge of the side plate 6 where the inner flap 233 is not connected. Similarly, if the width of the upper outer flap is designed to be smaller than the width of the top plate 4, and an open edge is formed at the edge of the top plate 4 where the upper outer flap is not connected, the breakable opening line 61 may extend in a straight line from the end of the breakable door line 41 to the open edge of the top plate 4 where the upper outer flap is not connected.

[0125] Furthermore, in order to explain that the breakable open line 61 extends to the open edge of the side plate 6 where the inner flap is not connected, or to the open edge of the top plate 4 where the upper outer flap is not connected, an example was given in which the width of the inner flap is smaller than the width of the side plate 6, or the width of the upper outer flap is smaller than the width of the top plate 4.

[0126] However, the present invention is not limited to this, and as shown in Figure 1, even if the width of the inner flap 33 is the same as the width of the side plate 6, or the width of the upper outer flap 31 is the same as the width of the top plate 4, if a cut is made from the corner of the top plate 4 along the upper outer flap fold line b1 or the inner flap fold line c, the openable breakable line 61 can exert its effect if it is connected to the cut.

[0127] In this case, the upper outer flap 31 at the cut in the above-mentioned section can be said not to be "connected to the top plate," and is therefore defined as not falling under "the region sandwiched between the outer flap connected to the top plate and the inner flap connected to the side plate, which is adjacent to the end of the open breakable line 61 in the present invention that the tip of the open breakable line 61 should reach" (similarly, the inner flap 33 at the cut in the above-mentioned section can also be said not to be "connected to the side plate").

[0128] In the above embodiment, the auxiliary fold line 62 was described as extending linearly from the tip of the downward breakable line 61a to the adjacent inner flap fold line c. However, the auxiliary fold line 62 only needs to be below the open breakable line 61, and does not need to be connected to the tip of the downward breakable line 61a, nor does it need to be formed on the extension of the downward breakable line 61a, nor does it need to reach the inner flap fold line c. Furthermore, the auxiliary fold line 62 is not limited to being linear, but may be bent, curved, or meandering. Moreover, the auxiliary fold line 62 may be omitted.

[0129] 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.

[0130] 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]

[0131] 1,20 packaging box 2 Torso 3 Occlusion 4 Top plate 5 Bottom plate 6 Side panels 31. Upper outer flap (outer flap) 32 Lower outer flap (outer flap) 33,233 Inner flap 41. Door breakable wire 42. Breakable line for the first door 43. Breakable line for the second door 61 Open breakable wire 61a Downward breakable wire 61b Rising breakable line 62 Auxiliary fold lines 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 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 formed along the body fold line at the midpoint in the longitudinal direction of the body fold line, and a door breakable line extending convexly from both ends of the door fold line. A packaging box characterized in that at least one of the top plate and the side plate in contact with the door fold line is provided with an openable breakable line that extends from the end of the door breakable line to an area adjacent to the end of the open end of the body portion, sandwiched between the outer flap connected to the top plate and the inner flap connected to the side plate.

2. 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. On one of the top plate and the bottom plate, outer flaps are connected to both ends of the open end of the body portion via outer flap fold lines. The outer flap has an insertable piece at its tip via an insertable 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, the outer flap which is folded inward along the outer flap fold line and is not fixed to the inner flap in a state in contact with the inner flap from the outside, and the insertion piece which is provided at the tip of the outer flap and is inserted into the gap between the other of the top plate and the bottom plate and the inner flap. The top panel is provided with a door fold line formed along the body fold line at the midpoint in the longitudinal direction of the body fold line, and a door breakable line extending convexly from both ends of the door fold line. A packaging box characterized in that at least one of the top plate and the side plate in contact with the door fold line is provided with an openable breakable line that extends from the end of the door breakable line to an area adjacent to the end of the open end of the body portion, sandwiched between the outer flap connected to the top plate and the inner flap connected to the side plate.

3. In the packaging box according to claim 1 or 2, A packaging box characterized in that the aforementioned breakable wire is provided on the side panel.

4. In the packaging box according to claim 3, The packaging box is characterized in that the open breakable wire has a downward breakable wire connected to the end of the door breakable wire and extending toward the bottom plate.

5. In the packaging box according to claim 4, The packaging box is characterized in that the side panel is provided with an auxiliary fold line on the extension of the downward breakable line.

6. In the packaging box according to claim 4 or 5, The packaging box is characterized in that the open breakable wire is connected to the downward breakable wire and has an upward breakable wire extending toward the top plate.

7. In the packaging box according to any one of claims 1 to 6, The packaging box is characterized in that the top panel has a pair of door fold lines formed along a pair of opposite door fold lines, and a pair of door breakable lines connecting the ends of each of the pair of door fold lines, and the two door breakable lines are at least partially in contact.

8. 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. At least one of the top plate, bottom plate, and side plate has flaps connected to both ends of the open end via flap fold lines. The aforementioned closure is closed when the flap is folded inward along the flap fold line. The top panel is provided with a pair of door fold lines formed along the middle of each body fold line in the longitudinal direction, and a pair of door breakable lines extending convexly from both ends of each door fold line, and both door breakable lines are formed to be at least partially in contact with each other. A packaging box characterized in that the side panel adjacent to the door fold line is provided with an openable breakable line that extends from the end of the door breakable line to the side end of the side panel adjacent to the end, in an area where the flap is not connected.

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