Packing box

Abstract

To provide a packaging box capable of vertically stacking a plurality of packaging boxes in a stable state even when the packaging boxes store objects.SOLUTION: A packaging box 1 includes side wall portions made up of four side plates 2-5, bottom portions made up of four flaps 6-9, and a support member 20. An upper end of the support member 20 is placed lower than an upper end of the side wall, and a boundary portion between two side plates is provided with a cut line c2 extending from an upper end toward a lower end side of the boundary portion.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a packaging box that is used by being stacked vertically. [Background technology]

[0002] A conventional packaging box is described in Patent Document 1. This packaging box includes four side panels arranged in a rectangular column shape and four top wall flaps that form the top wall of the packaging box. Four notches are formed in the four corners of the upper end of this packaging box. Each notch is formed by cutting out a circle in the upper end portion of the boundary between two adjacent side panels and in the boundary between the top wall flap and the side panel.

[0003] When empty, this packaging box is stacked vertically with the top flaps open, with the top flaps of the lower packaging box held in a position substantially parallel to the side panels, and the bottom of the upper packaging box engaging with the edges of the four notches of the lower packaging box (see Figure 2 of the document). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3202257 Summary of the Invention [Problem to be solved by the invention]

[0005] With the conventional packaging boxes described above, when the boxes are not empty but contain items, the weight of the items can cause the four corners of the bottom of the upper packaging box to disengage from the edges of the notches in the lower packaging box, causing the packaging box to tilt or fall downwards. As a result, there is a problem that multiple packaging boxes cannot be stacked stably vertically.

[0006] To provide a packaging box that can be stacked vertically in a stable state even when the packaging boxes contain items, with the present invention being made to solve the above-mentioned problems. [Means for solving the problem]

[0007] In order to achieve the above object, the invention of claim 1 is a packaging box having a polygonal cylindrical side wall portion consisting of three or more side plates, a bottom portion that seals the lower end of the side wall portion, and a support portion that extends upward from the bottom portion, wherein the upper end of the support portion is positioned lower than the upper end of the side wall portion, and a cut line is provided at the boundary between two adjacent side plates from the upper end of the boundary portion toward the lower end.

[0008] According to this packaging box, a cut line is provided at the boundary between two adjacent side panels, extending from the upper end to the lower end of the boundary. Therefore, when multiple packaging boxes are stacked vertically, the bottom of the upper packaging box pushes the gap between the side panels of the lower packaging box along the cut line and is supported from below by the support portion of the lower packaging box. Since the upper end of the support portion is located below the upper end of the side wall, the lower end of the side wall of the upper packaging box is also supported laterally by the upper end of the side wall of the lower packaging box. As described above, this packaging box allows multiple packaging boxes to be stacked vertically in a stable manner, even when each box contains an item. In this specification, the term "boundary between two side panels" refers to the boundary between the two side panels or the area near the boundary line, including the boundary line, up to a predetermined distance (e.g., several to several tens of millimeters) from the boundary line.

[0009] The invention of claim 2 is characterized in that, in the packaging box described in claim 1, the cut line has a vertical line portion extending downward from the upper end of the boundary portion by a first predetermined length, and a horizontal line portion extending horizontally from the lower end of the vertical line portion between two adjacent side panels by a second predetermined length.

[0010] According to this packaging box, when multiple packaging boxes are stacked vertically, the boundaries of the side panels of the lower packaging box are pushed apart along the vertical and horizontal lines of the score line by the corners of the bottom of the upper packaging box. At this time, the horizontal lines of the score line extend horizontally between the two side panels by a second predetermined length, making it easy for the corners of the bottom of the upper packaging box to fit between the two side panels, facilitating stacking of multiple packaging boxes. Furthermore, even if a portion of the side panel of the lower packaging box is torn left and right along the horizontal lines of the score line by the bottom of the upper packaging box during stacking, the tearing is only horizontal, preventing the upper packaging box from tilting at an angle, allowing multiple packaging boxes to be stacked stably vertically.

[0011] The invention according to claim 3 is characterized in that in the packaging box according to claim 2, the lower end of the vertical line portion is configured to be at a height equal to or lower than the upper end of the support portion.

[0012] According to this packaging box, the lower end of the vertical line portion of the cut line is configured to be at a height equal to or lower than the upper end of the support portion, so that when multiple packaging boxes are stacked vertically, the bottom of the upper packaging box is mainly supported from below by the support portion of the lower packaging box. As a result, it is possible to prevent excessive load from acting on the edge of the horizontal line portion of the cut line of the lower packaging box, and it is possible to suppress deformation of the packaging boxes when multiple packaging boxes are stacked vertically.

[0013] The invention of claim 4 is characterized in that the packaging box according to any one of claims 1 to 3 has a first support portion and a second support portion, and the first support portion and the second support portion are configured to bend or curve relative to each other when viewed in a plane.

[0014] According to this packaging box, when multiple packaging boxes are stacked vertically, the bottom of the upper packaging box is supported from below by the support parts of the lower packaging box. In this case, the first support part and the second support part of the support part are configured to bend or curve relative to each other when viewed in a plane, so that the first support part and the second support part of the support part can support the upper packaging box in a stable state.

[0015] The invention of claim 5 is characterized in that, in the packaging box of any of claims 1 to 4, at least one of the three or more side panels has a window portion that is convexly cut out downward from the middle part in the left-right direction of the upper end of at least one of the side panels.

[0016] According to this packaging box, at least one side panel has a window portion that is cut out in a convex shape downward from the middle part in the left-right direction of the upper end, so that even when multiple packaging boxes are stacked, the contents inside the packaging box can be checked from the outside through this window portion. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a sealed state of a packaging box according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged view of part A in FIG. [Figure 3] FIG. 2 is a plan view showing the configuration of the packaging box before assembly. [Figure 4] FIG. 2 is a plan view showing the configuration of the support member before assembly. [Figure 5] Figure 5A is a perspective view showing the assembled packaging box, Figure 5B is a perspective view showing the support member folded in half, and Figure 5C is a perspective view showing the folded support member being stored in the packaging box. [Figure 6] FIG. 2 is a perspective view showing a state in which the storage item and the support member are stored in a packaging box. [Figure 7] FIG. 2 is a perspective view showing the packaging box after it has been opened. [Figure 8] FIG. 2 is a front view showing a state in which opened packaging boxes are stacked vertically. [Figure 9] FIG. 2 is a perspective view showing a state in which opened packaging boxes are stacked vertically. [Figure 10] FIG. 10 is an enlarged view of part B in FIG. 9. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, a packaging box according to one embodiment of the present invention will be described with reference to the drawings. As shown in Fig. 1, the packaging box 1 of this embodiment is a so-called A-type cardboard box, which has a rectangular parallelepiped appearance.

[0019] This packaging box 1 is sealed with the support member 20 and the contents S housed inside (see FIG. 6), and when opened, a part of the box is broken (see FIG. 7).

[0020] This packaging box 1 is formed by punching out a substantially rectangular corrugated cardboard 1x shown in Fig. 3 from base paper, and then folding and assembling it. The configuration of the corrugated cardboard 1x will be described below with reference to Fig. 3. In the following description of the corrugated cardboard 1x, for convenience, the up-down direction in Fig. 3 will be referred to as "up-down" and the left-right direction as "left-right."

[0021] As shown in Fig. 3, the corrugated paperboard 1x has a left panel 2, a front panel 3, a right panel 4, and a rear panel 5. These four side panels 2 to 5 are all rectangular in plan view, formed integrally, and have the same length in the vertical direction. In the case of the packaging box 1 of this embodiment, these four side panels 2 to 5 form a rectangular tubular side wall portion.

[0022] A pair of upper and lower outer flaps 6, 6 are connected to the upper and lower ends of the left side panel 2. Each of these outer flaps 6, 6 is formed in a rectangular shape in a plan view, and its left-right length is set to be slightly shorter than that of the left side panel 2. The vertical length of each outer flap 6 is the same as that of an outer flap 8 and inner flaps 7, 9, which will be described later, and is set to be approximately half the size of the left-right length of the front side panel 3.

[0023] Furthermore, a fold line f1 and a part of the breakable line c1 are formed at the boundary between the left side plate 2 and the upper outer flap 6, and a fold line f2 is formed at the boundary between the left side plate 2 and the lower outer flap 6. These fold lines f1 and f2 are ruled lines (or perforated lines) that make it easier to fold the corrugated paperboard 1x, and this also applies to other fold lines described later.

[0024] Furthermore, the fold line f1 extends a predetermined length in the left-right direction at the center of the boundary line between the left side panel 2 and the upper outer flap 6. The breakable line c1 extends between both ends of the fold line f1 and both left and right ends of the boundary line between the left side panel 2 and the upper outer flap 6, and extends downward in a convex trapezoidal shape from both ends of the fold line f1. This breakable line c1 is composed of a perforation line that makes it easy to fold and break the corrugated paperboard 1x, and this also applies to the other breakable lines described below.

[0025] Furthermore, the breakable line c1 has a shape that branches into two in the center of its lower part and then merges into one, and the part surrounded by these two branched breakable lines c1 forms finger insertion part 2a that an operator can break and insert their finger into when opening packaging box 1. As will be described later, when opening packaging box 1, left side plate 2 is broken along this breakable line c1, and a window part 2b (only a part of which is shown in FIG. 7) is formed in left side plate 2.

[0026] On the other hand, an adhesive strip 10 is attached to the left end of the left side plate 2 via a fold line f3, and this adhesive strip 10 is formed in a trapezoidal shape in a plan view. A cut line c2 is provided at the boundary between the upper end of this adhesive strip 10 and the upper end of the left side plate 2.

[0027] The cut line c2 is formed in a substantially inverted T-shape and has a vertical line portion c21 and a horizontal line portion c22 (see FIG. 2). The vertical line portion c21 extends downward from the upper end of the boundary line between the front panel 3 and the right panel 4 by a first predetermined length, and the horizontal line portion c22 extends laterally from the lower end of the vertical line portion c21 between the front panel 3 and the right panel 4 by a second predetermined length. The lower end of the vertical line portion c21 is set so as to be lower than the upper end of the support member 20 (described later) when the support member 20 is stored in the packaging box 1.

[0028] This cut line c2 is also provided at the boundary between the upper end of the adhesive piece 10 and the upper end of the left side plate 2, the boundary between the upper end of the left side plate 2 and the upper end of the front side plate 3, and the boundary between the upper end of the right side plate 4 and the upper end of the rear side plate 5.

[0029] The front plate 3 is connected to the right end of the left plate 2 via a fold line f4. The front plate 3 is configured so that its length in the vertical direction is the same as that of the left plate 2, but its length in the horizontal direction is shorter than that of the left plate 2.

[0030] A pair of upper and lower inner flaps 7, 7 are connected to the upper and lower ends of the front panel 3. Each of these inner flaps 7, 7 is formed in a rectangular shape in a plan view, and its length in the left-right direction is set to be slightly shorter than that of the front panel 3. A part of the breakable line c3 and a fold line f5 are formed at the boundary between the front panel 3 and the upper inner flap 7, and a fold line f6 is formed at the boundary between the front panel 3 and the lower inner flap 7.

[0031] The fold line f5 extends in the left-right direction for a predetermined length at the left-right center of the boundary line between the front panel 3 and the upper inner flap 7. The breakable line c3 extends between both ends of the fold line f5 and both left and right ends of the boundary line between the front panel 3 and the upper outer flap 6, and extends downward from both ends of the fold line f5 in a convex trapezoidal shape.

[0032] In addition, the breakable line c3 has a shape in which it branches into two in the center of its lower part and then merges into one, and the area surrounded by these two branched breakable lines c3 forms a finger insertion portion 3a that an operator can break and insert their finger into when opening the packaging box 1.

[0033] When the packaging box 1 is opened, as will be described later, the front panel 3 is broken along the breakable line c3, thereby forming a window portion 3b (see FIG. 7) in the front panel 3. This window portion 3b has a trapezoidal shape that is convexly cut out downward from the middle part of the upper end of the front panel 3 (a part toward the center, a predetermined distance from both the left and right ends of the upper end).

[0034] Additionally, a right side plate 4 is connected to the right end of the front side plate 3 via a fold line f7. This right side plate 4 is the same size as the left side plate 2 and is configured to be plane symmetrical. Additionally, a pair of upper and lower outer flaps 8, 8 are connected to the upper and lower ends of the right side plate 4, and these outer flaps 8, 8 are configured identically to the outer flaps 6, 6 described above.

[0035] Furthermore, a part of the tearable line c4 and a fold line f8 are formed at the boundary between the right side panel 4 and the upper outer flap 8, and a fold line f9 is formed at the boundary between the right side panel 4 and the lower outer flap 8. These fold lines f8 and f9 are configured in the same way as the fold lines f1 and f2 described above.

[0036] Furthermore, the breakable line c4 has the same configuration as the breakable line c1. That is, the breakable line c4 extends downward from both ends of the fold line f8 in a trapezoidal shape, branches into two at the center of its lower end, and then merges into one. The area surrounded by these two branched breakable lines c4 forms a finger insertion portion 4a that an operator can break and insert their finger into when opening the packaging box 1.

[0037] When opening the packaging box 1, as will be described later, the right side panel 4 is broken along the breakable line c4, thereby forming a trapezoidal window 4b (see FIG. 7) in the right side panel 4. This window 4b has a trapezoidal shape that is cut out convexly downward from the middle of the upper end of the right side panel 4 (a portion near the center, a predetermined distance from both the left and right ends of the upper end).

[0038] A rear plate 5 is connected to the right end of the right side plate 4 via a fold line f10. This rear plate 5 has the same size as the front plate 3, and a pair of upper and lower inner flaps 9, 9 are connected to its upper and lower ends via a breakable line c5 and a fold line f11. Each of these inner flaps 9, 9 is configured to be the same size and shape as the inner flap 7 described above.

[0039] Next, the support member 20 will be described with reference to Fig. 4. This support member 20 is made of corrugated cardboard, and as will be described later, when sealing the packaging box 1, it is folded into a U-shape in plan view and stored inside the packaging box 1. In the following description of the support member 20, for convenience, the up-down direction in Fig. 4 will be referred to as "up-down" and the left-right direction will be referred to as "left-right."

[0040] As shown in the figure, the support member 20 is composed of an outer portion 21, an inner portion 22, and a connecting portion 23. The outer portion 21 is the portion located on the outside when the support member 20 is bent into a U-shape in plan view, and is formed into a horizontally elongated rectangle in plan view.

[0041] The outer portion 21 includes a central portion 21a and left and right folded portions 21b, 21b, each of which is rectangular in plan view, and the left and right folded portions 21b, 21b are connected to both left and right ends of the central portion 21a via a pair of fold lines f21, f21. In this embodiment, the central portion 21a corresponds to the first support portion, and the folded portions 21b, 21b correspond to the second support portion.

[0042] The inner portion 22 is the portion located on the inside when the support member 20 is bent into a U-shape in plan view, and is formed into a horizontally long rectangle in plan view. The inner portion 22 has the same vertical length as the outer portion 21, but is slightly shorter in the left-right direction.

[0043] The inner portion 22 includes a central portion 22a and left and right folded portions 22b, 22b, each of which is rectangular in plan view, and the left and right folded portions 22b, 22b are connected to both left and right ends of the central portion 22a via a pair of fold lines f22, f22. In this embodiment, the central portion 22a corresponds to the first support portion, and the folded portions 22b, 22b correspond to the second support portion.

[0044] Furthermore, the connecting portion 23 is connected via a pair of fold lines f23, f23 between the central portion 21a of the outer portion 21 and the central portion 22a of the inner portion 22. The connecting portion 23 has a horizontally elongated rectangular shape in a plan view, and is formed so that its vertical length is significantly shorter than those of the outer portion 21 and the inner portion 22, and its horizontal length is the same as that of the central portion 22a of the inner portion 22.

[0045] Next, a procedure for assembling the packaging box 1 shown in Fig. 1 using the corrugated paperboard 1x shown in Fig. 3 and the support member 20 shown in Fig. 4 will be described. In the following description, the direction indicated by the arrows X1-X2 in Fig. 1 will be referred to as the "front-rear direction," the direction indicated by the arrows Y1-Y2 will be referred to as the "left-right direction," and the up-down direction will be referred to as the "up-down direction."

[0046] First, a worker folds the left side panel 2 of the corrugated paperboard 1x along the fold line f4 in the assembly direction so that it is perpendicular to the front side panel 3. In this case, the "assembly direction" is the direction in which all four side panels 2 to 5 in Figure 3 become the front side of the packaging box 1.

[0047] Furthermore, the front side plate 3 is bent in the assembly direction via fold line f7 so as to be perpendicular to the right side plate 4, and the right side plate 4 is bent in the assembly direction via fold line f10 so as to be perpendicular to the rear side plate 5.

[0048] Next, the adhesive strip 10 is folded in the assembly direction relative to the left side panel 2 along fold line f3, and then fixed to the rear side panel 5 with an adhesive. After that, the lower inner flap 7 is folded toward the inside of the packaging box 1 along fold line f6 so as to be perpendicular to the front side panel 3, and the lower inner flap 9 is folded toward the inside of the packaging box 1 along fold line f11 so as to be perpendicular to the rear side panel 5.

[0049] Then, the lower outer flap 6 is folded toward the inside of the packaging box 1 along the fold line f2 so as to be perpendicular to the left side panel 2, and then fixed with adhesive to the surfaces of the lower inner flaps 7 and 9. Furthermore, the lower outer flap 8 is folded toward the inside of the packaging box 1 along the fold line f9 so as to be perpendicular to the right side panel 4, and then fixed with adhesive to the surfaces of the lower inner flaps 7 and 9.

[0050] As a result of the above, the packaging box 1 in the state shown in Fig. 5A is produced. In the case of the packaging box 1 shown in the figure, the bottom is made up of the lower inner flaps 7, 9 and the lower outer flaps 6, 8, the lower ends of the side walls are sealed by the bottom, and the upper inner flaps 7, 9 and the upper outer flaps 6, 8 are in an open state.

[0051] Next, as shown in Figure 5B, the worker folds the outer portion 21 and inner portion 22 of the support member 20 toward the connecting portion 23 via a pair of fold lines f23, f23, and positions the support member 20 so that its connecting portion 23 is on top.

[0052] 5C, in the support member 20, the left and right folded portions 22b, 22b of the inner portion 22 are folded at right angles along a pair of fold lines f22, f22 relative to the central portion 22a so as to form a U-shape in plan view. At the same time, the left and right folded portions 21b, 21b of the outer portion 21 are folded at right angles along a pair of fold lines f21, f21 relative to the central portion 21a so as to form a U-shape in plan view.

[0053] After being folded as described above, the support member 20 is stored in the packaging box 1. Thereafter, the item S is stored in the packaging box 1, for example, in the state shown in Fig. 6. Then, in the packaging box 1 in the state shown in Fig. 6, the upper inner flaps 7 and 9 are closed, and then the upper outer flaps 6 and 8 are fixed to the upper inner flaps 7 and 9, thereby completing the packaging box 1 in the sealed state shown in Fig. 1.

[0054] When opening the sealed packaging box 1 shown in Figure 1, the worker presses the finger insertion portions 2a, 4a of the left and right side panels 2, 4 inward with the fingers of both hands, and inserts the fingers of both hands into the packaging box 1 while breaking them along the breakable lines c1, c4, and in that state, breaks the left and right side panels 2, 4 along the breakable lines c1, c4.

[0055] The worker then breaks the front panel 3 along the breakable line c3 using the same procedure as above, and then breaks the rear panel 5 along the breakable line c5. By the above operations, the packaging box 1 is opened as shown in Fig. 7. When the packaging box 1 is opened in this manner, a trapezoidal window 3b is formed in the front panel 3, and trapezoidal window portions 2b and 4b are formed in the left and right side panels 2 and 4, respectively, which are trapezoidal in side view.

[0056] In this opened state, one item S is stored in the gap between the support member 20 and the front side panel 3, and this item S can be seen through the window 3b of the front side panel 3. Similarly, multiple items S can be seen through the windows 2b, 4b of the left and right side panels 2, 4.

[0057] 8 and 9, the packaging box 1 of this embodiment can stack multiple (three in the figure) opened packaging boxes 1 vertically. Note that the contents S are omitted from FIG. 8 for ease of understanding. When packaging boxes 1 are stacked in this manner, the bottom of the upper packaging box 1 is supported by the upper surface of the support member 20, which is U-shaped in plan view. At the same time, as shown in FIGS. 9 and 10, the corners of the bottom of the upper packaging box 1 are supported from below by the horizontal lines c22 while pushing open the vertical lines c21 of the cut lines c2 at the four corners of the lower packaging box 1.

[0058] As described above, according to the packaging box 1 of this embodiment, when a plurality of packaging boxes 1 in an opened state are stacked vertically, the corners of the bottom of the upper packaging box 1 easily enter the lower packaging box 1 while pushing open the gap between the side panels of the lower packaging box 1 along the vertical line portions c21 of the cut lines c2. In addition, since the upper end of the support member 20 is positioned below the upper ends of the left, right, front, and rear side panels 2 to 5 of the lower packaging box 1, the lower end of the bottom of the upper packaging box 1 is supported from the side by the upper ends of the left, right, front, and rear side panels 2 to 5 of the lower packaging box 1.

[0059] Furthermore, since the inner portion 22 and the outer portion 21 of the support member 20 are stored in the packaging box 1 in a state where they are folded into a U-shape in plan view, the upper packaging box 1 is stably supported by the inner portion 22 and the outer portion 21 of the support member 20. As described above, according to this packaging box 1, even when each of the plurality of packaging boxes 1 contains an item S, the plurality of packaging boxes 1 can be stacked vertically in a stably state.

[0060] Furthermore, the lower end of the vertical line portion c21 of the cut line c2 is set to be at a height equal to or lower than the upper end of the support member 20, so that when multiple packaging boxes 1 are stacked vertically, the bottom of the upper packaging box 1 is mainly supported from below by the support member 20 of the lower packaging box 1. As a result, it is possible to avoid excessive load acting on the edge of the horizontal line portion c22 of the cut line c2 of the lower packaging box 1, and to suppress deformation of the packaging boxes 1 when multiple packaging boxes 1 are stacked vertically.

[0061] Furthermore, since the three side plates 2 to 4 of the packaging box 1 in the opened state are formed with window portions 2b to 4b, even when a plurality of packaging boxes 1 are stacked, the contents S stored in the packaging box 1 can be checked from the outside through these window portions 2b to 4b. This ensures high convenience.

[0062] When multiple packaging boxes 1 in an opened state are stacked vertically, a plate-like member may be interposed between the bottom of the upper packaging box 1 and the support member 20 of the lower packaging box 1. In this configuration, it is possible to further improve the stability when multiple packaging boxes 1 are stacked vertically, and also to protect the stored items S in the lower packaging box 1.

[0063] In the embodiment, the vertical line portion c21 and the horizontal line portion c22 are provided as the cut lines, but the cut lines of the present invention are not limited to this and may include at least the vertical line portion c21. In this case, by providing V-shaped fold lines extending from the lower ends of the vertical line portion c21 to the upper ends of two adjacent side panels, it is possible to prevent the side panels from bending along the V-shaped fold lines when the packaging boxes 1 are stacked, and to prevent the upper ends of the boundary portions from being crushed.

[0064] In addition, the embodiment is an example in which the packaging box 1 has upper inner flaps 7, 9 and upper outer flaps 6, 8, and the top wall of the packaging box is formed by these flaps when the packaging box is sealed, but the packaging box of the present invention is not limited to this, and may be any box having polygonal cylindrical side walls, a bottom that seals the lower ends of the side walls, and a support portion that extends upward from the bottom. For example, the packaging box 1 of the embodiment may be one in which the upper inner flaps 7, 9 and the upper outer flaps 6, 8 are omitted.

[0065] Furthermore, although the embodiment is an example in which a rectangular tubular side wall is used, the side wall of the present invention is not limited to this, and may be a polygonal tubular side wall made up of three or more side plates. For example, a triangular tubular side wall made up of three side plates may be used, or a polygonal tubular side wall made up of four or more side plates may be used.

[0066] In addition, although the embodiment is an example in which the support member 20 as a support part is configured separately from the packaging box 1, instead, the support member 20 may be configured integrally with the packaging box 1. In that case, the support member 20 may be configured to be integrally connected to the corrugated paperboard 1x.

[0067] Furthermore, although the embodiment is an example in which the support member 20 deformed into a U-shape in plan view is used as the support portion, the support portion of the present invention is not limited to this, and may be any support portion having a first support portion and a second support portion, which are configured to bend or curve relative to each other when viewed in plan. For example, the support portion may be one in which the first support portion and the second support portion are arranged in a T-shape or an X-shape in plan view, or one in which the first support portion and the second support portion are arranged in an S-shape in plan view.

[0068] On the other hand, although the embodiment uses trapezoidal window portions 2b to 4b, the window portion of the present invention is not limited to this and may have a shape that is convexly cut out downward from the middle portion in the left-right direction of the upper end of the side plate. For example, the window portion may be configured in a triangular, rectangular, circular or curved shape. [Explanation of symbols]

[0069] 1 packaging box 2 Left side plate (side wall) 2b Window section 3 Front side panel (side wall) 3b Window section 4 Right side plate (side wall) 4b Window section 5 Rear side plate (side wall part) 6 Lower outer flap (bottom) 7 Lower inner flap (bottom) 8 Lower outer flap (bottom) 9 Lower inner flap (bottom) 20 Support member (support part) 21a Center part (1st support part) 21b Bending portion (second support portion) 22a Center part (first support part) 22b Bending portion (second support portion) c2 Cut line c21 Vertical line section c22 horizontal line section

Claims

1. a polygonal cylindrical side wall portion consisting of three or more side plates; a bottom portion sealing the lower end of the side wall portion; A packaging box having a support portion extending upward from the bottom portion, an upper end of the support portion is located lower than an upper end of the side wall portion, A packaging box characterized in that a cut line is provided at the boundary between two adjacent side panels from the upper end of the boundary to the lower end thereof.

2. The packaging box according to claim 1, The packaging box is characterized in that the cut line has a vertical line portion extending downward from the upper end of the boundary portion by a first predetermined length, and a horizontal line portion extending horizontally from the lower end of the vertical line portion between the two adjacent side panels by a second predetermined length.

3. The packaging box according to claim 2, A packaging box characterized in that the lower end of the vertical line portion is configured to be at a height equal to or lower than the upper end of the support portion.

4. The packaging box according to any one of claims 1 to 3, The support portion has a first support portion and a second support portion, and the first support portion and the second support portion are configured to bend or curve relative to each other when viewed in a plane.

5. The packaging box according to any one of claims 1 to 4, At least one of the three or more side panels has a window portion that is convexly cut out downward from the middle of the upper end of the at least one side panel in the left-right direction.

Images