Packing box

Abstract

To provide a packaging box in which a content can be easily taken out and from which the content hardly jumps out when being unpacked.SOLUTION: At a top plate 5 of a packaging box 1, a breakable line C is formed for breaking the top plate 5 when opening the packaging box 1, and the breakable line C extends from a front plate 2 side toward a rear plate 4 side of the top plate 5. In a second inner flap 8 continuously provided at left and right side end parts of the rear plate 4 of the packaging box 1, when it is in contact with a first outer flap 7, an upper end part is pressed by the top plate 5 (fixed plate 5b).SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a wraparound case type packaging box that breaks a part of the box when unpacking.

Background Art

[0002] Currently, a wraparound case type packaging box as described in Patent Document 1 is known. In this packaging box, a front plate, a rear plate, a top plate, a bottom plate, etc. are integrally formed. Also, when unpacking this packaging box, an operator puts a finger into the notch hole of the front plate and lifts the front plate upward, then separates the upper part of the front plate from the lower part of the front plate through a breakable line, and then rotates the front plate and the top plate backward. Thereby, the packaging box is unpacked.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when unpacking the packaging box of Patent Document 1, the top plate and the flap connected thereto are lifted simultaneously, and a part of the side wall disappears. Therefore, the contents may pop out of the packaging box due to the momentum during unpacking.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a packaging box in which the contents are easy to take out and difficult to pop out when unpacking.

Means for Solving the Problems

[0006] To achieve the above object, the present invention is a rectangular parallelepiped wraparound case type packaging box, A rectangular base plate, a rectangular top plate positioned opposite the base plate, a front plate connecting the front end of the base plate and the front end of the top plate, a rear plate connecting the rear end of the base plate and the rear end of the top plate, a pair of first inner flaps attached to the left and right ends of the front plate so as to bend inward, a pair of second inner flaps attached to the left and right ends of the rear plate so as to bend inward, and a pair of second inner flaps attached to the left and right ends of the base plate so as to bend inward The packaging box comprises: 1. An inner flap and a pair of second inner flaps positioned outside the pair of second inner flaps, a pair of first outer flaps not fixed to the pair of second inner flaps, a pair of second outer flaps connected to the left and right ends of the top plate so as to fold inward, and fixed to the pair of first outer flaps in contact with the outside, and a third outer flap connected to the front and rear ends of one of the plates in the combination of the bottom plate, top plate, front plate, and rear plate located at both ends when the packaging box is unfolded. At least the top panel has a breakable line formed thereon for breaking the top panel when the packaging box is opened, the breakable line extends from the front panel side to the rear panel side of the top panel, and the upper end of the second inner flap is pressed down by the top panel when in contact with the first outer flap. Furthermore, the top panel has a notch into which the second inner flap can be fitted when the packaging box is opened. It is characterized by having this feature. Another aspect of the present invention is a rectangular parallelepiped wrap-around case type packaging box, A rectangular base plate, a rectangular top plate positioned opposite the base plate, a front plate connecting the front end of the base plate and the front end of the top plate, a rear plate connecting the rear end of the base plate and the rear end of the top plate, a pair of first inner flaps attached to the left and right ends of the front plate so as to bend inward, a pair of second inner flaps attached to the left and right ends of the rear plate so as to bend inward, and a pair of second inner flaps attached to the left and right ends of the base plate so as to bend inward The packaging box comprises: 1. An inner flap and a pair of second inner flaps positioned outside the pair of second inner flaps, a pair of first outer flaps not fixed to the pair of second inner flaps, a pair of second outer flaps connected to the left and right ends of the top plate so as to fold inward, and fixed to the pair of first outer flaps in contact with the outside, and a third outer flap connected to the front and rear ends of one of the plates in the combination of the bottom plate, top plate, front plate, and rear plate located at both ends when the packaging box is unfolded. At least the top panel has a breakable line formed thereon for breaking the top panel when the packaging box is opened, the breakable line extends from the front panel side to the rear panel side of the top panel, the upper end of the second inner flap is pressed down by the top panel when in contact with the first outer flap, the breakable line has a first line portion extending for a predetermined length in the left-right direction at the front panel side end of the top panel, a pair of second line portions extending diagonally from both ends of the first line portion, spaced apart from each other, to the boundary between the top panel and the pair of second outer flaps, and a pair of third line portions extending for a predetermined length from the ends of the pair of second line portions along the boundary to both corners on the rear panel side of the top panel, and the top panel has a notch near the boundary that intersects with the pair of second line portions and into which the second inner flap can be fitted.

[0007] The packaging box of the present invention comprises a bottom plate, a top plate, a front plate, a rear plate, a pair of first inner flaps connected to the left and right side ends of the front plate, a pair of second inner flaps connected to the left and right side ends of the rear plate, a pair of first outer flaps connected to the left and right side ends of the bottom plate, second outer flaps connected to the left and right side ends of the top plate, and a third outer flap connected to the front and rear side ends of one of the plates located at both ends when the packaging box is unfolded.

[0008] In this packaging box, the first outer flap and the second outer flap are fixed together with adhesive, but the first outer flap and the second inner flap are not. Therefore, when the top panel is broken along the breakable line to open the packaging box, if the second inner flap is folded away from the first outer flap, the second inner flap will detach from the top panel and fall backward together with the back panel, making it easier to remove the contents of the packaging box.

[0009] Furthermore, when the packaging box is opened, if the second inner flap is in contact with the first outer flap, the remaining portion of the top panel acts as a fixing plate, holding down the upper edge of the second inner flap. As a result, the rear panel does not tilt backward, and only a portion of the top panel (lid) opens. In this state, the contents can be removed from the top of the packaging box. Thus, the ease of removing the contents of this packaging box can be changed depending on how it is opened. Furthermore, the breakable lines of the packaging box consist of a first line section, a second line section, and a third line section. By breaking the first, second, and third line sections, a portion of the top panel (lid section) opens and stands up, allowing the packaging box to be unpacked. In addition, a pair of notches intersecting the second lines are provided on the top panel, allowing the second inner flap to be fitted into the notches. This allows the second inner flap to be fitted into the notches and opened slowly during the unpacking process, and also allows the top panel to be held upright.

[0010] In the packaging box of the present invention, it is preferable that the packaging box is made of corrugated cardboard, and that the second inner flap has ridges extending vertically from the packaging box.

[0011] With this configuration, the second inner flap has a stepped section that extends vertically from the packaging box (when viewed from above, multiple wave-like cross-sections are visible), which increases its strength against pressure from above when the upper end of the second inner flap is held down by the top plate.

[0014] Furthermore, in the packaging box of the present invention, it is preferable that the second line portion is composed of a main line connected to the first line portion and a secondary line connecting the main line to the pair of third line portions and having a gentler slope than the main line that descends in the direction of the boundary.

[0015] According to this configuration, the sub-line of the second line part has a gentler slope than the main line that descends in the direction of the boundary. Therefore, when re-sealing, the second inner flap contacts the sub-line and is guided, and after being inserted into the notch once, it returns to the position where it contacts the first outer flap. As a result, this packaging box can smoothly close the top plate (lid part) and re-seal it.

Brief Description of the Drawings

[0016] [Figure 1] It is a perspective view of the state of the packaging box before unpacking according to an embodiment of the present invention. [Figure 2] It is a perspective view of the unpacked state of the packaging box. [Figure 3] It is a plan view of the state (corrugated cardboard) before assembling the packaging box. [Figure 4] (a) Diagram for explaining the unpacking operation (state 1). (b) Diagram for explaining the unpacking operation (state 2). (c) Diagram for explaining the unpacking operation (state 3). (d) Diagram for explaining the unpacking operation (state 4). [Figure 5] (a) Diagram for explaining the re-sealing operation (state 1). (b) Diagram for explaining the re-sealing operation (state 2). (c) Diagram for explaining the re-sealing operation (state 3). (d) Diagram for explaining the re-sealing operation (state 4).

Mode for Carrying Out the Invention

[0017] Hereinafter, a packaging box according to an embodiment of the present invention will be described with reference to the drawings.

[0018] The packaging box 1 shown in FIG. 1 is a wrap-around case type corrugated box whose appearance is formed in a rectangular parallelepiped shape. Also, FIG. 2 shows the unpacked state of the packaging box 1. The packaging box 1 houses a product (contents) inside and can be unpacked by breaking a part of the top plate.

[0019] As shown in FIGS. 1 and 2, the packaging box 1 is composed of a front plate 2, a bottom plate 3, a rear plate 4, a top plate 5, a first inner flap 6, a first outer flap 7, a second inner flap 8, a pair of second outer flaps 9, and a third outer flap 10. The second outer flap 9 overlaps the outside of the first outer flap 7, and both of them form the side plate of the packaging box 1. In addition, the first outer flap 7 and the second outer flap 9 are fixed with an adhesive or the like.

[0020] As shown in FIG. 2, the second inner flap 8 is continuously provided so as to bend inward from the left and right side ends of the rear plate 4 respectively, and is located inside the first outer flap 7. Since the second inner flap 8 is not fixed to the first outer flap 7, it can be extracted from the top plate 5 by bending it in a direction away from the first outer flap 7 when opening the packaging box 1. In the following, the part of the top plate 5 separated at the time of opening is called the lid part 5a, and the remaining part is called the fixing plate 5b.

[0021] Also, in FIG. 2, although shown by a partial broken line for the sake of explanation, the first inner flap 6 is continuously provided so as to bend inward from the left and right side ends of the front plate 2 respectively, and is located inside the first outer flap 7.

[0022] Although details will be described later, the cut line intersecting the breakable line C on the top plate 5 is a notch D into which the second inner flap 8 can be inserted. In addition, a third outer flap 10 is continuously provided at the front end of the top plate 5. The second line part C2 of the breakable line C extends up to the third outer flap 10, and the first line part C1 may be provided on the third outer flap 10 or at its end (the side not adjacent to the top plate 5). In addition, the third outer flap 10 of the present embodiment overlaps the upper outside of the front plate 2 and is fixed to the front plate 2 with an adhesive or the like, but may be in a mode of overlapping and fixing inside the front plate 2.

[0023] This packaging box 1 is formed by punching out a substantially rectangular cardboard sheet 1x shown in FIG. 3 from the base paper, and then folding and assembling it. Hereinafter, the details of the cardboard sheet 1x will be described while referring to FIG. 3. For the sake of convenience of explanation, the upper side of FIG. 3 is referred to as "front" and the lower side as "rear".

[0024] As shown in Figure 3, the corrugated cardboard sheet 1x comprises the front panel 2, bottom panel 3, rear panel 4, and top panel 5 described above, all of which are rectangular in plan view and integrally formed. The length of the corrugated cardboard sheet 1x in the front-to-back direction (from the rear end of the front panel 2 to the front end of the third outer flap 10) is 724 mm, and the length in the lateral direction (including both flaps) is 513 mm.

[0025] The front panel 2 is connected to the rear end of the bottom panel 3 via a fold line f1. This fold line f1 is a line designed to facilitate the folding of the corrugated cardboard 1x, and this is also true for the other fold lines described later. The left-right dimensions of the front panel 2 are set to be slightly smaller than those of the bottom panel 3. A pair of first inner flaps 6, 6 are connected to the left and right ends of the front panel 2, respectively, via fold lines f2, f2.

[0026] A pair of first outer flaps 7, 7 are connected to the left and right edges of the base plate 3 via fold lines f3, f3. Each first outer flap 7 is formed in a rectangular shape in plan view, and its length in the front-to-back direction is set to be slightly smaller than that of the base plate 3. Furthermore, the length of each first outer flap 7 in the left-to-right direction is set to be approximately the same size as the height (front-to-back size) of the front plate 2 and the rear plate 4.

[0027] Furthermore, the rear panel 4 is connected to the front end of the bottom panel 3 via a fold line f4 and is configured to be the same size as the front panel 2. A pair of second inner flaps 8, 8 are connected to the left and right ends of the rear panel 4 via fold lines f5, f5. Each second inner flap 8 is formed in a rectangular shape in plan view, and its length in the front-to-back direction is set to be slightly smaller than that of the rear panel 4. The length of each second inner flap 8 in the left-to-right direction is set to be approximately the same size as the first outer flap 7.

[0028] The top panel 5 is connected to the front end of the rear panel 4 via a fold line f6. The second outer flaps 9, 9 are connected to the left and right ends of the top panel 5 via fold lines f7, f7, respectively. The top panel 5 is constructed to the same size as the bottom panel 3, and each second outer flap 9 is constructed to the same size and shape as each first outer flap 7.

[0029] Furthermore, a breakable line C is formed on the top plate 5. This breakable line C is composed of a first line section C1, a pair of second line sections C2, C2, and a pair of third line sections C3, C3.

[0030] The first linear section C1 is formed at the front end of the top plate 5, in the center in the left-right direction, and extends in the left-right direction for a predetermined length. The pair of second linear sections C2, C2 extend diagonally backward from both ends of the first linear section C1 to predetermined positions at the boundary between the top plate 5 and the second outer flaps 9, 9, while being spaced apart from each other.

[0031] The broken lines c21, c21 (the "main lines" of the present invention) that constitute the second line section C2 are connected to both ends of the first line section C1. On the other hand, the broken lines c22, c22 (the "sub-lines" of the present invention) that constitute the second line section C2 are connected to the pair of third line sections C3, C3, respectively. The broken lines c22, c22 descend toward the boundary between the top plate 5 and the second outer flaps 9, 9 and have a gentler slope than the broken line c21.

[0032] The cut lines D',D' which form the notch D are located near the boundary between the top plate 5 and the second outer flaps 9,9, and are arc-shaped lines that intersect with the pair of break lines c22,c22. The distance L1 between the fold line f7 and the cut line D' is 9 mm, and the length L2 of the cut line D' is 25 mm.

[0033] Furthermore, the pair of third line sections C3, C3 extend for a predetermined length along the fold lines f7, f7 from the rear end (break line c22) of the pair of second line sections C2, C2 to the corner on the rear plate 4 side of the top plate 5.

[0034] A third outer flap 10 is attached to the front edge of the top panel 5 via a fold line f8. The third outer flap 10 is rectangular in plan view, with its size in the left-right direction being slightly smaller than that of the front panel 2, and its size in the front-back direction being considerably smaller than that of the front panel 2.

[0035] The position at which the third outer flap 10 is connected varies depending on the configuration of the corrugated cardboard 1x. The third outer flap 10 only needs to be connected to the front and rear ends of one of the plates in the combination of the front plate 2, bottom plate 3, rear plate 4, and top plate 5 located at both ends when the packaging box 1 is unfolded.

[0036] For example, if the front panel 2 and top panel 5 are at both ends when unfolded, the third outer flap 10 can be connected to the end of the front panel 2 (the side not adjacent to the bottom panel 3). In this case, when the packaging box is assembled, the third outer flap 10 will overlap the upper outer side of the top panel 5. For this reason, a second line section C2 may be provided on the third outer flap 10 to match the second line section C2 of the top panel 5, and a first line section C1 may be provided on the end of the third outer flap 10 (the side adjacent to the front panel 2).

[0037] Next, referring to Figure 4, we will explain the procedure for unpacking the packaging box 1 shown in Figure 1.

[0038] The first line portion C1 of the breakable line C protrudes slightly forward from the front edge of the top panel 5 in the unpacked state of the packaging box 1 (see Figures 1 and 3). Therefore, the worker grasps this protruding portion and lifts it upward, breaking the top panel 5 along the breakable line C. By breaking the first line portion C1, the second line portion C2, and the third line portion C3 in that order, the lid portion 5a of the top panel 5 becomes upright (see Figure 4(a)). In this state, the contents of the packaging box 1 can be removed from the top.

[0039] At this time, the second inner flap 8 is in contact with the first outer flap 7. Also, when assembling the packaging box 1, the upper end of the second inner flap 8 is held down by the fixing plate 5b of the top plate 5. Note that the thickness of the second inner flap 8 is approximately 3 mm, while the distance from the end on the side plate (second outer flap 9) side to the notch D (the interval L1 in Figure 3) is 9 mm. Therefore, the second inner flap 8 is held down by the fixing plate 5b on the side plate side of the notch D.

[0040] Here, the second inner flap 8 has a vertically extending step when the packaging box 1 is assembled, so when viewed from above, a number of wave-like cross-sections are visible. Furthermore, the height gap between the second inner flap 8 and the fixing plate 5b is only 2 to 4 mm. For this reason, the packaging box 1 has high strength against pressure from above and will not collapse.

[0041] Next, when the lid portion 5a of the top plate 5 is tilted further backward from the upright position, the second inner flap 8 gradually separates from the first outer flap 7. Then, the upper end of the second inner flap 8 attempts to pull out upward from the notch D (see Figure 4(b)). Here, the notch D is a cut that follows the direction of the corrugated cardboard, while the second inner flap 8 has high strength in the pressing direction at the corrugated section where many waves are visible from above, so the second inner flap 8 can be pulled out upward relatively easily.

[0042] When the lid portion 5a of the top plate 5 is tilted further backward, the second inner flap 8 fits into the notch D and becomes locked in place (see Figure 4(c)). If the contents are not packed tightly, the second inner flap 8 can be removed from the fixing plate 5b by the operator, but in normal unpacking operations, the second inner flap 8 goes through a state where it is locked in the notch D (temporarily upright state). As a result, the lid portion 5a opens slowly, preventing the contents from spilling out.

[0043] When the lid portion 5a of the top plate 5 is tilted further backward, the second inner flap 8 eventually exits upward through the notch D, and the lid portion 5a tilts completely down together with the rear plate 4 (see Figure 4(d)). In this state, the contents of the packaging box 1 can be removed from above by sliding them in the direction of the tilted rear plate 4 and lid portion 5a.

[0044] A key feature of packaging box 1 is that, by breaking along the breakable line C, no part of the box is separated until it is unpacked, thus preventing the generation of fragments. In other words, packaging box 1 does not generate any extra scraps when unpacked, and all parts remain connected, so it can be discarded as a single component.

[0045] Finally, referring to Figure 5, the procedure for resealing the packaging box 1 shown in Figures 2 and 4 will be explained.

[0046] When the worker raises the lid portion 5a of the top plate 5 forward to reseal the packaging box 1, the rear plate 4 and the second inner flap 8 rise together (see Figure 5(a)). Then, the side edge of the second inner flap 8 during the assembly of the packaging box 1 comes into contact with the fixing plate 5b (the portion of the break line c22).

[0047] The portion of the fixing plate 5b at the break line c22 slopes downward toward the second outer flap 9. Therefore, when the lid portion 5a of the top plate 5 is raised further forward, the second inner flap 8 is guided by the fixing plate 5b and bends in a direction that gradually moves away from the first outer flap 7. The second inner flap 8 is then guided toward the notch D (see Figure 5(b)).

[0048] When the lid portion 5a of the top plate 5 is raised further forward, the second inner flap 8 fits into the notch D and becomes locked in place (see Figure 5(c)). Subsequently, the second inner flap 8 slides downward through the notch D, and the upper end of the second inner flap 8, when the packaging box 1 is assembled, enters the lower side of the fixing plate 5b (see Figure 5(d)).

[0049] Ultimately, the second inner flap 8 returns to a position where it contacts the first outer flap 7, and its upper end is held down by the fixing plate 5b. In this way, the packaging box 1 can close its lid 5a smoothly and slowly, which gives it excellent workability when resealing.

[0050] The present invention is not limited to the above embodiments, and can be implemented in various forms without departing from its spirit. In this embodiment, the breakable line C had its first line portion C1 at the front end of the top plate 5, but the first line portion C1 may be located closer to the center in the front-to-back direction of the top plate 5 so that the contents can be removed when the lid portion 5a is upright.

[0051] The break line c22 of the second line section C2 needs to have an inclination as shown in the embodiment (see Figure 3), but the length of the other first line section C1 and the length and inclination of the break line c21 of the second line section C2 can be changed as appropriate. For example, the connection between the first line section C1 and the second line section C2 may be in a right-angle shape. Also, the length of the third line section C3 should be such that when the lid section 5a is raised, the upper end of the second inner flap 8 during the assembly of the packaging box 1 is held down by the fixing plate 5b. [Explanation of Symbols]

[0052] 1...Packaging box, 2...Front panel, 3...Bottom panel, 4...Rear panel, 5...Top panel, 5a...Lid, 5b...Fixing panel, 6...First inner flap, 7...First outer flap, 8...Second inner flap, 9...Second outer flap, 10...Third outer flap, C...Breakable line, C1...First line section, C2...Second line section, C3...Third line section, D...Notch, D'...Cutting line.

Claims

1. A rectangular, wrap-around type packaging box, A rectangular base plate, A rectangular top plate is positioned opposite the bottom plate, A front plate connecting the front end of the bottom plate and the front end of the top plate, A rear plate connecting the rear end of the bottom plate and the rear end of the top plate, A pair of first inner flaps are connected to the left and right ends of the front plate so as to bend inward, A pair of second inner flaps are connected to the left and right ends of the rear plate so as to bend inward, They are connected to the left and right ends of the bottom plate so as to bend inward, and are positioned outside the pair of first inner flaps and the pair of second inner flaps, and a pair of first outer flaps that are not fixed to the pair of second inner flaps, A pair of second outer flaps are attached to the left and right ends of the top plate so as to bend inward, and are fixed to the pair of first outer flaps in a state where they are in contact with each other from the outside, The packaging box comprises a third outer flap connected to the front and rear ends of one of the plates in the combination of the bottom plate, top plate, front plate, and rear plate located at both ends when the box is unfolded, At least the top panel has a breakable line formed on it for breaking the top panel when the packaging box is opened. The breakable line extends from the front panel side of the top panel toward the rear panel side, When the second inner flap is in contact with the first outer flap, its upper end is held down by the top plate. The packaging box is characterized in that the top panel has a notch into which the second inner flap can be fitted when the packaging box is opened.

2. A rectangular, wrap-around type packaging box, A rectangular base plate, A rectangular top plate is positioned opposite the bottom plate, A front plate connecting the front end of the bottom plate and the front end of the top plate, A rear plate connecting the rear end of the bottom plate and the rear end of the top plate, A pair of first inner flaps are connected to the left and right ends of the front plate so as to bend inward, A pair of second inner flaps are connected to the left and right ends of the rear plate so as to bend inward, They are connected to the left and right ends of the bottom plate so as to bend inward, and are positioned outside the pair of first inner flaps and the pair of second inner flaps, and a pair of first outer flaps that are not fixed to the pair of second inner flaps, A pair of second outer flaps are attached to the left and right ends of the top plate so as to bend inward, and are fixed to the pair of first outer flaps in a state where they are in contact with each other from the outside, The packaging box comprises a third outer flap connected to the front and rear ends of one of the plates in the combination of the bottom plate, top plate, front plate, and rear plate located at both ends when the box is unfolded, At least the top panel has a breakable line formed on it for breaking the top panel when the packaging box is opened. The breakable line extends from the front panel side of the top panel toward the rear panel side, When the second inner flap is in contact with the first outer flap, its upper end is held down by the top plate. The breakable line comprises a first line portion extending a predetermined length in the left-right direction at the front end of the top plate, a pair of second line portions extending diagonally from both ends of the first line portion, spaced apart from each other, to the boundary between the top plate and the pair of second outer flaps, and a pair of third line portions extending a predetermined length from the ends of the pair of second line portions along the boundary to both corners of the rear end of the top plate. A packaging box characterized in that it has a notch on the top plate near the boundary that intersects with the pair of second lines and into which the second inner flap can be fitted.

3. In the packaging box according to claim 1 or 2, The aforementioned packaging box is made of cardboard, The packaging box is characterized in that the second inner flap has a stepped section that extends vertically in the packaging box.

4. In the packaging box according to claim 2, The packaging box is characterized in that the second line section is composed of a main line connected to the first line section and a secondary line connecting the main line to the pair of third line sections and having a gentler slope than the main line that descends in the direction of the boundary.

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