Packing box

Abstract

To provide a packaging box that can perform an anti-slip function while reducing the amount of paper used.SOLUTION: A packaging box A is rectangular in shape, of the so-called wraparound case type, and includes: an opening 7 provided in a top wall portion 3; and a protrusion 8 provided in a bottom wall 4 so as to protrude outward and to be formed in a position to enter the opening 7 of other packaging box A when stacked with the other packaging box A on the bottom side. The edge of the opening 7 is provided with an opening convex portion 72 or an opening concave portion 73 that widens the width thereof along a second side wall portion 5 of the top wall portion 3, and the projection 8 has a projection concave portion 83 that fits with the opening convex portion 72 or a projection convex portion 84 that fits with the opening concave portion 73.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a paper packaging box that can be stacked with two or more boxes.

Background Art

[0002] Conventionally, a rectangular parallelepiped wrap-around case type cardboard packaging box that can accommodate a plurality of products is known (see Patent Document 1). This packaging box includes a rectangular tube-shaped body portion that extends in the horizontal direction, and a pair of closing portions that close the open ends of the body portion. The body portion is composed of a top plate, a bottom plate, and a pair of side plates, and the closing portion is composed of a pair of inner flaps connected to the side plates and a pair of outer flaps respectively connected to the top plate and the bottom plate and fixed to the outer surface of the inner flaps.

[0003] This type of packaging box is stacked in the vertical direction and transported. Therefore, when packaging heavy items such as canned beverage products, in order to prevent the upper packaging box stacked during transportation from slipping off, a hot melt adhesive having an anti-slip effect is applied to the top plate.

[0004] By the way, reducing the amount of paper used is a common issue when making a packaging box. Therefore, even with this packaging box, reducing the amount of paper used by providing an opening in the top plate has been considered.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, when an opening is provided in the top plate, there is a risk that when the hot melt adhesive is applied to the top plate, the hot melt adhesive may be accidentally applied to the products inside the packaging box.

[0007] The present invention aims to solve the above problems and to provide a packaging box that can reduce paper usage while also providing an anti-slip function. [Means for solving the problem]

[0008] To achieve this objective, the present invention provides a paper packaging box that can be stacked in two or more configurations, comprising: a top wall portion and a bottom wall portion facing each other; a pair of first side wall portions connecting the top wall portion and the bottom wall portion and facing each other; and a pair of second side wall portions connecting the top wall portion and the bottom wall portion and facing each other in a direction intersecting the direction in which the first side wall portions face each other, wherein an opening is provided in the top wall portion; and the bottom wall portion is provided so as to protrude outward from the bottom wall portion, and when stacked with other packaging boxes on the bottom, the opening of the other packaging boxes The invention is characterized by having a projection formed at a position that fits into the opening, an opening projection provided on the edge of the opening along the second side wall of the top wall, which narrows the width of the opening in the direction in which the pair of second side walls of the opening face each other, or an opening recess that widens the width, and a projection recess provided on the projection that fits with the opening projection provided on the opening of the other packaging box in a plane parallel to the top wall of the other packaging box when the other packaging box is stacked with the other packaging box on the bottom, or a projection that fits with the opening recess.

[0009] In the packaging box of the present invention, since an opening is provided in the top wall, the amount of paper used can be reduced.

[0010] Furthermore, in the packaging box of the present invention, the projection provided on the bottom wall portion so as to protrude outward fits into the opening of the lower packaging box in the stack. At this time, one of the openings has an opening projection (or opening recess) along its edge, and the projection recess (or projection) provided on the projection portion fits into this opening projection (or opening recess) in a plane parallel to the top wall portion.

[0011] As a result, if the stacked upper packaging box is about to slide along the first side wall, the projection of the upper packaging box will come into contact with the portion of the side edge of the opening of the lower packaging box that is along the second side wall, thereby preventing the stacked upper packaging box from sliding along the first side wall.

[0012] Furthermore, if the stacked upper packaging box is about to slide along the second side wall, the protruding recess (or protruding projection) on the projection of the upper packaging box engages with the opening projection (or opening recess) on the side edge of the opening of the lower packaging box, thus preventing the stacked upper packaging box from sliding along the second side wall.

[0013] Therefore, the packaging box of the present invention can reduce the amount of paper used while providing an anti-slip function.

[0014] In the packaging box of the present invention, it is preferable that the opening extends from the top wall portion to the first side wall portion (second packaging box of the present invention).

[0015] According to the second packaging box of the present invention, the amount of paper used can be reduced because the opening extends to the first side wall. However, in the packaging box of the present invention, the projection recess (or projection protrusion) of the projection of the upper packaging box fits into the opening projection (or opening recess) of the opening provided in the lower packaging box in a plane parallel to the top wall, thereby preventing the stacked upper packaging box from sliding in the direction along the second side wall. Therefore, even if the upper end of the first side wall is removed, the anti-slip function is not affected.

[0016] Therefore, according to the second packaging box of the present invention, the amount of paper used can be reduced further without reducing the anti-slip function.

[0017] In the second packaging box of the present invention, it is preferable that the opening is provided extending from one of the pair of first side walls through the top wall to the other (third packaging box of the present invention).

[0018] According to the third packaging box of the present invention, the amount of paper used can be further reduced without compromising the anti-slip function.

[0019] In the third packaging box of the present invention, it is preferable that the opening is provided with a wavy opening undulation by alternately providing a plurality of opening protrusions and opening recesses, and that the bottom wall is provided with a pair of protrusions adjacent to each of the pair of first side wall portions, and that the protrusions are provided with a wavy protrusion undulation that fits with the opening undulation by alternately providing a plurality of protrusion recesses and protrusions (fourth packaging box of the present invention).

[0020] According to the fourth packaging box of the present invention, an opening is provided along the entire area of ​​the top wall portion in the direction along the second side wall portion, and a wavy opening protrusion is provided at the edge of the opening. Therefore, when two packaging boxes are placed side by side with their first side walls facing back to back, a wavy opening protrusion having a length equal to that of two packaging boxes is installed.

[0021] Furthermore, in the fourth packaging box of the present invention, the bottom wall portion is provided with a pair of protrusions adjacent to each of the pair of first side wall portions, and each protrusion portion is provided with a wavy protrusion that can be fitted into the opening recess and recess of the opening.

[0022] Therefore, when two packaging boxes are stacked on top of each other as described above, the protruding and recessed parts of the upper packaging box fit together with the protruding and recessed parts of the openings of the two lower packaging boxes.

[0023] Therefore, according to the fourth packaging box of the present invention, the anti-slip function can be achieved not only by stacking in a straight line (a stacking method in which the upper packaging box is stacked on top of the lower packaging box in the same direction), but also by stacking the upper packaging boxes with their positions offset in the direction along the second side wall.

[0024] In addition, in the first to fourth packaging boxes of the present invention, it is preferable that the protruding portion has a pair of cut lines for protrusions provided from the bottom wall portion to the first side wall portion, a pair of folding lines for protrusions provided on each of the bottom wall portion and the first side wall portion and connecting the ends of the pair of cut lines for protrusions, and a valley fold line for protrusions provided on the bottom wall portion and connecting the middle portions of the pair of cut lines for protrusions (the fifth packaging box of the present invention).

[0025] According to the fifth packaging box of the present invention, when the paper constituting the packaging box is bent at a substantially right angle at its boundary line from the flat state to the bottom wall portion and the first side wall portion, when viewed from the inside of the packaging box, the folding lines for protrusions and the valley fold lines for protrusions provided on the first side wall portion are valley-folded, while the folding lines for protrusions provided on the bottom wall portion are mountain-folded. As a result, the section surrounded by the pair of folding lines for protrusions and the pair of cut lines for protrusions protrudes outward from the bottom wall portion to form a protruding portion.

[0026] Therefore, according to the fifth packaging box of the present invention, by simply bending the bottom wall portion and the first side wall portion at a substantially right angle at their boundary line, the protruding portion can be made to protrude, and an anti-slip function can be achieved.

[0027] In addition, in the first packaging box of the present invention, it is preferable to further have an auxiliary protruding portion provided on the bottom wall portion so as to protrude outward from the bottom wall portion and formed at a position that enters the opening of the other packaging box when the other packaging box is stacked in a posture rotated 90° horizontally with the other packaging box on the lower side (the sixth packaging box of the present invention).

[0028] According to the sixth packaging box of the present invention, the auxiliary protruding portion provided on the bottom wall portion so as to protrude outward enters the opening of the lower packaging box stacked with a 90° shift in the horizontal direction. As a result, when the upper packaging box stacked with a 90° shift is likely to slide in the direction along the second side wall portion, the auxiliary protruding portion of the upper packaging box abuts against the portion along the second side wall portion among the side edges of the opening of the lower packaging box, so that the upper packaging box stacked is prevented from sliding in the direction along the second side wall portion.

[0029] Therefore, according to the sixth packaging box of the present invention, the anti-slip function can be achieved even when the upper and lower packaging boxes are stacked with a 90° offset. [Brief explanation of the drawing]

[0030] [Figure 1] A perspective view showing the external appearance of the packaging box according to this embodiment. [Figure 2] A perspective view showing the exterior of the packaging box according to this embodiment, viewed from the rear. [Figure 3] This diagram shows the configuration of the packaging box according to this embodiment before assembly. [Figure 4] A perspective view showing the stacked state of the packaging boxes according to this embodiment. [Figure 5] A plan view showing the arrangement of the first layer in an example of a stacking method for packaging boxes according to this embodiment. [Figure 6] This is a bottom view showing the arrangement of the second layer in an example of a stacking method for packaging boxes according to this embodiment. [Figure 7] A front view of an example of a method for stacking packaging boxes according to this embodiment. [Figure 8] This diagram shows the amount of paper saved by the packaging box according to this embodiment. [Figure 9] An exploded view showing the configuration of the packaging box before assembly, relating to a modified example. [Modes for carrying out the invention]

[0031] Hereinafter, with reference to Figures 1 to 8, a packaging box A according to one embodiment of the present invention (hereinafter simply referred to as "this embodiment") will be described.

[0032] As shown in Figure 1, packaging box A is a wrap-around case type with a rectangular parallelepiped shape. In packaging box A, for example, canned beverage products are individually packaged in sleeve-type multi-pack paper containers of six cans each, and four sets of these multi-packs are stored inside packaging box A (not shown).

[0033] The packaging box A has a hexagonal cylindrical body portion 1 extending in the front-to-back direction, and a pair of closing portions 2 (corresponding to the "first side wall portion" of the present invention) that close the open ends of the body portion 1 in the front-to-back direction.

[0034] The body section 1 is composed of a pair of top plates 3 (corresponding to the "top wall section" of the present invention), a bottom plate 4 (corresponding to the "bottom wall section" of the present invention), a pair of side plates 5 (corresponding to the "second side wall section" of the present invention), and a pair of inclined plates 6. The closing section 2 is composed of a connecting side plate 52, an inner flap 53, a lower outer flap 41, and an upper outer flap 31, which will be described later.

[0035] The top plate 3 is spaced apart in the left-right direction in Figure 1 and extends in the front-rear direction along the side plates 5, forming an opening 7 in the gap. Furthermore, the opening 7 extends from the top plate 3 to the closing section 2, reaching the vertical center (the tip of the upper outer flap 31, which will be described later) at the horizontal center of the closing section 2.

[0036] As shown in Figure 2, the back surface of the packaging box A is provided with two protrusions 8 and four auxiliary protrusions 9. The protrusions 8 are located adjacent to the front and rear ends of the bottom plate 4 in the left-right center. The auxiliary protrusions 9 are located two on each side of the left and right ends of the bottom plate 4.

[0037] Packaging box A is formed by punching out a roughly rectangular corrugated cardboard sheet 2A, as shown in Figure 3, from a base paper, and then folding and assembling it.

[0038] First, referring to Figure 3, we will explain the top plate 3, bottom plate 4, side plate 5, and inclined plate 6 of the corrugated cardboard 2A that make up the body 1.

[0039] As shown in Figure 3, a base plate 4 is placed in the center of the corrugated cardboard sheet 2A. The base plate 4 is roughly rectangular in shape, and more specifically, its four corners are cut out by chamfered portions 4a to form an octagon. Side plates 5 are connected to the left and right ends of the base plate 4 via the body fold lines a.

[0040] The side panels 5 are formed in a roughly rectangular shape. The side panels 5 have an H-shaped break initiation section 51 in the center. The break initiation section 51 is formed by perforations with intermittent cuts. Inclined panels 6 are connected to the right end of the right side panel 5 and the left end of the left side panel 5 via the body fold line b.

[0041] The inclined plate 6 is roughly rectangular in shape, and more specifically, it is formed in an inverted trapezoid shape with the side plate 5 as the upper base. The top plate 3 is connected to the right end of the right inclined plate 6 and the left end of the left inclined plate 6 via the fold line c of the body.

[0042] The top plate 3 is roughly rectangular in shape, and more specifically, the corner on the side of the inclined plate 6 is cut out to form a hexagon. The right edge of the right top plate 3 and the left edge of the left top plate 3 are provided with openings and protrusions 71 that extend over almost their entire length. The openings and protrusions 71 are formed in a wave-like pattern by alternately providing multiple openings and protrusions 72 and multiple openings and recesses 73.

[0043] As shown in Figure 1, when the corrugated cardboard 2A is assembled as a packaging box A, the opening 7 has a narrower width (distance in the left-right direction) due to the opposing opening protrusions 72 and a wider width (distance in the left-right direction) due to the opposing opening recesses 73.

[0044] Next, with reference to Figure 3, the upper outer flap 31, lower outer flap 41, connecting side plate 52, and inner flap 53 of the corrugated cardboard 2A, which constitute the closing section 2, will be described.

[0045] As shown in Figure 3, the top panel 3 has upper outer flaps 31 connected to its upper and lower ends via upper outer flap fold lines d. The upper outer flaps 31 are formed in a roughly rectangular shape. In this embodiment, a total of four upper outer flaps 31 are provided at the four corners of the corrugated cardboard sheet 2A shown in Figure 3.

[0046] The bottom plate 4 has lower outer flaps 41 connected to its upper and lower ends via lower outer flap fold lines e. The lower outer flaps 41 are formed in a roughly rectangular shape.

[0047] The side panel 5 has connecting side panels 52 attached to its upper and lower ends via side panel fold lines f. The connecting side panels 52 are used to chamfer the four corners of the packaging box in the circumferential direction, creating an octagonal shape in plan view, and therefore, in this embodiment, a total of four are provided.

[0048] The connecting side plate 52 is roughly rectangular in shape, and has a bulging portion 52a on the side edge facing the inclined plate 6. The bulging portion 52a is the part that abuts from the outside against the upper edge of the inclined plate 6 and a part of the upper edge of the top plate 3 when assembled as the packaging box A shown in Figure 1. As shown in Figure 3, inner flaps 53 are connected to the upper and lower ends of the connecting side plate 52 via inner flap fold lines g.

[0049] The inner flap 53 is roughly rectangular in shape, and has an inner flap recess 53a on the base end side (closer to the connecting side plate 52) and an inner flap protrusion 53b on the tip end side (farther from the connecting side plate 52) of the side edge on the bottom plate 4 side. The inner flap protrusion 53b is the part that extends in line with a virtual line that extends along the side edge of the connecting side plate 52 on the bottom plate 4 side. The inner flap recess 53a is the part that recesses the inner flap 53 in a direction away from the bottom plate 4 than the virtual line. The side edge of the inner flap 53 on the bottom plate 4 side is formed into a gentle S-shape by the continuous provision of the inner flap recess 53a and the inner flap protrusion 53b.

[0050] Next, referring to Figure 3, the configuration related to the protrusion 8 of the corrugated cardboard sheet 2A will be explained.

[0051] The bottom plate 4 and the lower outer flap 41 have a pair of projection cut lines 81 that extend in a direction perpendicular to the lower outer flap fold line e. The projection cut lines 81 extend continuously from the bottom plate 4 to the lower outer flap 41. The distance between the pair of projection cut lines 81 is formed to be approximately the same as, or slightly smaller than, the left-right distance of the opening 7 when assembled as packaging box A as shown in Figure 1.

[0052] As shown in Figure 3, the projection cut line 81 is provided with projections and irregularities 82 along its entire surface. The projections and irregularities 82 are formed in a wave-like shape by alternately providing multiple projections and recesses 83 and multiple projections and protrusions 84.

[0053] The opening protrusions 72 and 73 of the aforementioned opening recessed portion 71, and the protrusions 83 and 84 of the protruding recessed portion 82, have approximately the same width in the vertical direction and depth in the horizontal direction as shown in Figure 3. Furthermore, when assembled as the packaging box A shown in Figure 1, in a plan view, the protrusions 83 of the protruding recessed portion 82 are located at the position corresponding to the opening protrusions 72 of the opening recessed portion 71, and the protrusions 84 of the protruding recessed portion 82 are located at the position corresponding to the opening recesses 73 of the opening recessed portion 71.

[0054] The lower outer flap 41 has a projection fold line h that connects the two ends of a pair of projection cut lines 81 on the lower outer flap 41 side. The projection fold line h extends parallel to the lower outer flap fold line e.

[0055] The base plate 4 has a projection fold line i that connects the two ends of the pair of projection cut lines 81 on the base plate 4 side. The projection fold line i is paired with the projection fold line h and extends parallel to the projection fold line h and the lower outer flap fold line e.

[0056] Furthermore, the bottom plate 4 has a projection valley fold line j that connects the middle sections of a pair of projection cut lines 81. The projection valley fold line j extends parallel to the projection fold line h, the projection fold line i, and the lower outer flap fold line e. In addition, the projection valley fold line j is formed close to the lower outer flap fold line e, sandwiching it together with the projection fold line h.

[0057] In this embodiment, by forming the projection fold line h and projection valley fold line j close to the lower outer flap fold line e, the amount that the projection 8 protrudes outward from the bottom plate 4 is adjusted to approximately the thickness of one sheet of corrugated cardboard (1 mm to 8 mm), and the majority of the projection 8 of the upper packaging box A is formed to fit within a plane parallel to the top plate 3 of the lower packaging box A.

[0058] Next, referring to Figure 3, the configuration related to the auxiliary protrusion 9 of the corrugated cardboard sheet 2A will be explained.

[0059] The bottom plate 4 and the side plate 5 have a pair of auxiliary cut lines 91 that extend in a direction perpendicular to the body fold line a. The auxiliary cut lines 91 extend in a continuous straight line from the bottom plate 4 to the side plate 5. The distance between the lower outer flap fold line e and the adjacent auxiliary cut line 91 is approximately the same as the distance between the body fold line a and the adjacent projection cut line 81.

[0060] The side panel 5 has an auxiliary fold line k that connects the two ends of the pair of auxiliary cut lines 91 on the side panel 5 side. The auxiliary fold line k extends parallel to the body fold line a.

[0061] The bottom plate 4 has an auxiliary fold line l that connects the bottom plate 4 side of a pair of auxiliary cut lines 91. The auxiliary fold line l is paired with the auxiliary fold line k and extends parallel to the auxiliary fold line k and the body fold line a.

[0062] Furthermore, the bottom plate 4 has an auxiliary valley fold line m that connects the middle sections of a pair of auxiliary cutting lines 91. The auxiliary valley fold line m extends parallel to the auxiliary fold line k, the auxiliary fold line l, and the body fold line a.

[0063] Next, we will explain the procedure for assembling the packaging box A shown in Figures 1 and 2 from the corrugated cardboard 2A shown in Figure 3.

[0064] First, a worker (or device) places a corrugated cardboard sheet 2A on, for example, a table (not shown), and multiple products (for example, four sets of multi-packs, each containing six cans of canned beverages) are placed in an orderly fashion on its base plate 4 (not shown).

[0065] Next, as shown in Figure 1, the side panel 5 is folded upward along the fold line a of the body and stands upright at a right angle from the bottom panel 4.

[0066] When the side panel 5 is folded at a right angle from the bottom panel 4 in this manner, when viewing the packaging box A from the inside, the side panel 5 is valley-folded along the auxiliary fold line k, the bottom panel 4 is valley-folded along the auxiliary valley fold line m, and the bottom panel 4 is mountain-folded along the auxiliary fold line l. As a result, the area enclosed by the auxiliary fold line k, the auxiliary fold line l, and the pair of auxiliary cut lines 91 protrudes downward from the bottom panel 4 as an auxiliary projection 9, as shown in Figure 2.

[0067] Next, the connecting side plate 52 is bent at approximately 45° relative to the side plate 5, inward towards the body 1 along the side plate fold line f. As a result, the side edge of the connecting side plate 52 on the bottom plate 4 side comes into contact with the chamfered portion 4a of the bottom plate 4 from the outside.

[0068] Next, the inner flap 53 is folded at approximately 45° relative to the connecting side plate 52 toward the body 1 along the inner flap fold line g. As a result, the side edge of the inner flap 53 on the bottom plate 4 side comes into contact with the lower outer flap fold line e from the inside.

[0069] At this time, the side edge of the inner flap 53 on the bottom plate 4 side is recessed at its base end by the inner flap recess 53a, so even if the side edge of the connecting side plate 52 on the bottom plate 4 side is in contact with the chamfered portion 4a of the bottom plate 4 from the outside, it is easy to fold it onto the lower outer flap 41. On the other hand, the side edge of the inner flap 53 on the bottom plate 4 side is bulging at its tip end by the inner flap protrusion 53b, so it can be reliably brought into contact with the lower outer flap fold line e.

[0070] Next, adhesive G is applied to the lower side of the outer surface of the inner flap 53.

[0071] Next, the lower outer flap 41 is folded upward along the lower outer flap fold line e and stands upright at a right angle from the base plate 4. As a result, the inner surface of the lower outer flap 41 is fixed to the outer surface of the inner flap 53 via adhesive G.

[0072] Furthermore, when the lower outer flap 41 is folded at a right angle from the bottom plate 4, when the packaging box A is viewed from the inside, the lower outer flap 41 is valley-folded along the projection fold line h, the bottom plate 4 is valley-folded along the projection valley fold line j, and the bottom plate 4 is mountain-folded along the projection fold line i. As a result, the area enclosed by the projection fold line h, the projection fold line i, and the pair of projection cut lines 81 protrudes downward from the bottom plate 4 as a projection 8, as shown in Figure 2.

[0073] Next, the inclined plate 6 is bent at approximately 45° relative to the side plate 5 along the fold line b of the body, in the direction toward the bottom plate 4. At this time, since the upper end of the connecting side plate 52 protrudes upward due to the bulge 52a, the inclined plate 6 fits into the gap between the opposing pair of bulges 52a. As a result, the bulges 52a of the connecting side plate 52 come into contact with the side edge of the inclined plate 6 from the outside.

[0074] Next, the top plate 3 is folded at approximately 45° relative to the inclined plate 6 along the fold line c of the body so as to face the bottom plate 4. At this time, a portion of the top plate 3 on the inclined plate 6 side also fits into the gap between the pair of opposing bulging portions 52a, similar to the inclined plate 6 described above. As a result, the bulging portion 52a of the connecting side plate 52 also comes into contact with a portion of the top plate 3 on the inclined plate 6 side from the outside. With this, the body 1 is completed.

[0075] Next, adhesive G is applied to the upper side of the outer surface of the inner flap 53.

[0076] Next, the upper outer flap 31 is folded downward along the upper outer flap fold line d and hangs perpendicularly from the top plate 3. This fixes the inner surface of the upper outer flap 31 to the outer surface of the inner flap 53 via adhesive G. This closes the open end of the body 1 and completes the closed section 2.

[0077] Furthermore, this creates a gap between the pair of top panels 3, and a continuous gap between each of the two sets of upper outer flaps 31, thereby forming an opening 7. Compared to a typical wrap-around case type packaging box, the opening 7 of the packaging box A in this embodiment is formed in a shape that appears to be cut out from the tip of the front upper outer flap 31, through the entire front-to-back direction of the top panel 3, to the tip of the rear upper outer flap 31.

[0078] With the above steps completed, the assembly of packaging box A containing the product is finished, and packaging box A in the state shown in Figure 1 is completed.

[0079] Next, the operation and effects of packaging box A in this embodiment will be described.

[0080] First, we will explain the anti-slip function of packaging box A when stacked in a row using Figure 4.

[0081] When the upper packaging box A is stacked directly on top of the lower packaging box A' in the same orientation, the distance between the protrusions 8 in the left-right direction (the distance between the pair of cut lines 81 for the protrusions) is approximately equal to or slightly smaller than the distance between the openings 7. Therefore, the protrusions 8 of packaging box A fit into the internal space of the opening 7 of packaging box A'.

[0082] Therefore, according to the packaging box A of this embodiment, when packaging box A is about to slide in the left-right direction, the left and right edges of the projection 8 of packaging box A (projection cut lines 81) come into contact with the edge of the opening 7 of packaging box A', thus preventing the upper packaging box A from sliding in the left-right direction.

[0083] Furthermore, since this projection 8 protrudes outward from the bottom plate 4 by about the thickness of one sheet of corrugated cardboard, most of the projection 8 of the upper packaging box A fits within a plane parallel to the top plate 3 of the lower packaging box A'.

[0084] Furthermore, an opening recess 71 is formed on the edge of the opening 7 of packaging box A', and protruding recesses 82 are formed on the left and right edges (cut lines 81 for the protrusions) of the projection 8 of packaging box A. The opening projection 72 and opening recess 73 of the opening recess 71 and the protruding recess 83 and projection 84 of the protruding recess 82 are of the same size and are positioned in corresponding positions in the vertical direction. Therefore, the opening projection 72 and the projection recess 83 fit together, and the opening recess 73 and the projection projection 84 fit together, so the opening recess 71 and the projection recess 82 interlock through multiple fittings.

[0085] As a result, if packaging box A is about to slide in the front-to-back direction, the protruding grooves 82 of the projection 8 of packaging box A will come into contact with the opening grooves 71 of the opening 7 of packaging box A'. Therefore, packaging box A prevents the upper packaging box A from sliding in the front-to-back direction.

[0086] Furthermore, while the auxiliary protrusions 9 are provided at the left and right ends of the bottom plate 4, the left and right ends of the upper side of the body 1 are chamfered by the inclined plates 6. Therefore, the auxiliary protrusions 9 of packaging box A fit into the chamfered space of packaging box A'.

[0087] Therefore, according to the packaging box A of this embodiment, when packaging box A is about to slide in the left-right direction, the auxiliary projection 9 of packaging box A comes into contact with the inclined plate 6 of packaging box A' from the outside, thus preventing the upper packaging box A from sliding in the left-right direction.

[0088] Next, as an example of loading goods onto a pallet, the anti-slip function of packaging box A when it is stacked in a deformed brick pattern will be explained using Figures 5-7.

[0089] First, in the first row, as shown in Figure 5, eight packaging boxes A' are arranged from front to back in the following order: three in the first row with the closure section 2 visible, three in the second row with the closure section 2 visible, and two in the third row with the side panel 5 visible. Next, in the second row, as shown in Figure 6, eight packaging boxes A are arranged from front to back in the following order: two in the first row with the side panel 5 visible, three in the second row with the closure section 2 visible, and three in the third row with the closure section 2 visible, and this is repeated as needed.

[0090] Figure 7 shows the first row of boxes stacked, viewed from the front. The distance between the lower outer flap fold line e and the adjacent auxiliary cut line 91 is approximately the same as the distance between the body fold line a and the adjacent projection cut line 81 (essentially the distance from the plane including the side panel 5 to the tip of the top panel 3). As shown in Figure 7, the auxiliary projection 9 of the left packaging box A fits into the internal space of the left opening 7 of packaging box A', and the auxiliary cut line 91 of the auxiliary projection 9 (9a1) of packaging box A contacts the left opening recess 71 (71a1) of the opening 7 of packaging box A'. Similarly, the auxiliary projection 9 of the right packaging box A fits into the internal space of the right opening 7 of packaging box A', and the auxiliary cut line 91 of the auxiliary projection 9 (9a2) of packaging box A contacts the right opening recess 71 (71a2) of the opening 7 of packaging box A'.

[0091] Similarly, as shown in Figures 5 and 6, the auxiliary protrusions 9a3 and 9a4 of the first row of packaging box A come into contact with the opening protrusions 71a3 and 71a4 of the first row of packaging box A', respectively.

[0092] Similarly, the auxiliary protrusions 9a5 to 9a10 of the third row of packaging box A come into contact with the opening protrusions 71a5 to 71a10 of the third row of packaging box A', respectively.

[0093] Furthermore, the openings 7 of the first and second row packaging boxes A' are continuous throughout the entire front-to-back direction, and fine irregularities are formed by the opening protrusions 72 and opening recesses 73. The second and third row packaging boxes A have projections 8 on the front and rear ends of each bottom plate 4. These projections 8 coincide with the openings 7 of the first and second row packaging boxes A' in the left-to-right direction, and irregularities are formed by the projection recesses 83 and projections 84 that fit with the opening protrusions 72 and opening recesses 73, respectively.

[0094] Therefore, even if the lower packaging box A' and the upper packaging box A are offset in the longitudinal direction (front-to-back direction in Figures 5 and 6) (they do not need to be stacked directly on top of each other), the opening recesses 71 and the protruding recesses 82 can be engaged.

[0095] As a result, as shown in Figures 5 and 6, the protruding parts 82b1 to 82b18 of the second and third rows of packaging boxes A come into contact with the opening protrusions 71b1 to 71b18 of the first and second rows of packaging boxes A', respectively.

[0096] Furthermore, in the first and second rows of packaging boxes A', the top plate 3 is continuously beveled along its entire length in the front-to-back direction by the inclined plate 6, whereas in the second and third rows of packaging boxes A, auxiliary protrusions 9 are provided along the left and right edges of each bottom plate 4.

[0097] Therefore, even if the lower packaging box A' and the upper packaging box A are offset in the longitudinal direction (front-to-back direction in Figures 5 and 6) (i.e., they are not stacked directly on top of each other), the auxiliary protrusions 9c1 to 9c18 of the second and third rows of packaging boxes A can be brought into contact with the inclined plates 6c1 to 6c18 of the first and second rows of packaging boxes A'.

[0098] Therefore, with the packaging box A of this embodiment, each upper row of packaging boxes A comes into contact with the other lower rows of packaging boxes A', thus preventing the upper packaging boxes A from sliding back and forth or side to side.

[0099] Next, we will explain the other effects of packaging box A.

[0100] Figure 8 is an explanatory diagram showing the amount of paper usage reduced by packaging box A of this embodiment. The corrugated cardboard sheet 2A' shown in Figure 8 represents the shape when the packaging box A does not have an opening 7, and the shaded area is the part that has been reduced by using the corrugated cardboard sheet 2A of this embodiment.

[0101] First, by providing the opening 7, the central part of the top plate 3' in the left-right direction can be reduced across its entire vertical area. Also, by providing the opening 7 across the closing section 2, the central part of the upper outer flap 31' in the left-right direction can also be reduced across its entire vertical area.

[0102] Furthermore, by providing the opening 7, the tip half of the inner flap 53' can be reduced so that it does not protrude from the opening 7. In addition, by making the upper outer flap 31' and lower outer flap 41' short flaps, the tip half of the upper outer flap 31' and lower outer flap 41' can also be reduced to match the tip of the inner flap 53.

[0103] Furthermore, since the body section 1 is constructed by fixing the top plate 3 with four upper outer flaps 31, rather than connecting the body sections 1 in the circumferential direction, the connecting piece (left end in Figure 8) can be omitted.

[0104] Furthermore, by making the base plate 4 octagonal, the side plates 5 and inner flaps 53 can be shortened. Similarly, by making the body 1 hexagonal, the top plate 3 and side plates 5 can be shortened.

[0105] According to the packaging box A (corrugated cardboard 2A) of this embodiment described above, the amount of paper used can be reduced by approximately 20% compared to corrugated cardboard 2A'.

[0106] Furthermore, in the packaging box A of this embodiment, the strength can be increased by making it octagonal in plan view and increasing the number of corners that extend in the vertical direction.

[0107] Furthermore, in the packaging box A of this embodiment, the connecting side plate 52, which is an additional surface added to create the octagonal shape, contacts the outside of the bottom plate 4, the inclined plate 6, and the top plate 3. Therefore, when the lower packaging box A' is stacked vertically and tries to bulge horizontally, the connecting side plate 52 can support it in a way that suppresses deformation.

[0108] [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.

[0109] In the above embodiment, the product described as being a canned beverage product packaged in a multi-pack, but any product that can fit in the packaging box is acceptable, and it does not need to be packaged in a multi-pack. Also, since packaging box A can be used like a tray, the product may be large enough to pass through the opening 7.

[0110] In the above embodiment, a box-shaped case with an octagonal base plate 4 and a hexagonal body 1 was described as an example. However, the present invention is not limited to this, and may be a normal wrap-around case type with a rectangular parallelepiped exterior, and the inclined plate 6 and connecting side plate 52 may be omitted.

[0111] Furthermore, although the above embodiment describes a wrap-around case type in which the body 1 extends horizontally, it may also be a so-called A-type packaging box in which the body 1 extends vertically. In this case, the tips of the pair of upper outer flaps are spaced apart to form an opening, and a projection protrudes from the lower outer flap. Therefore, the packaging boxes are stacked after being rotated 90° horizontally, and it is preferable that the lengths of the long side and the short side are equal.

[0112] In the above embodiment, the example was given using a base plate 4 that is octagonal, but the base plate 4 may be square, hexagonal, or other shapes.

[0113] In the embodiment described above, the body portion 1 was described using a hexagonal cylindrical shape as an example, but the body portion 1 may be a square cylindrical shape, an octagonal cylindrical shape, or the like, as long as it is rectangular.

[0114] In the above embodiment, the opening 7 is provided from the tip of one upper outer flap 41 through the entire front-to-back direction of the top plate 3 to the tip of the other upper outer flap 41, but it can also be provided in only a part of the top plate 3. In this case, multiple small, closed openings 7 adjacent to the upper outer flap 31 of the top plate 3 can be provided along the upper outer flap 31.

[0115] In the above embodiment, we have described an example in which two protrusions 8 are provided on the back surface of the packaging box A so as to be adjacent to both lower outer flaps 41. However, there may be one or more protrusions 8 as long as they are adjacent to the lower outer flaps 41.

[0116] In the above embodiment, we have described an example in which four auxiliary protrusions 9 are provided on the back surface of the packaging box A adjacent to the side panel 5. However, there is no limit to the number of auxiliary protrusions 9 as long as they are adjacent to the side panel 5, and they can also be omitted.

[0117] In the above embodiment, the inclined plate 6 was described as having an inverted trapezoidal shape, but if the base plate 4 is rectangular, the inclined plate 6 can also be rectangular. As mentioned above, the inclined plate 6 itself can also be omitted.

[0118] In the above embodiment, the connecting side plate 52 was described as having a bulging portion 52a on the side edge facing the inclined plate 6, but the bulging portion 52a can be omitted. As mentioned above, the connecting side plate 52 itself can also be omitted.

[0119] In the above embodiment, a hexagonal top plate 3 was used as an example, but if the bottom plate 4 is rectangular, the top plate 3 can also be rectangular. As mentioned above, the top plate 3 does not necessarily have to be divided into left and right halves and provided as a pair; it can also be formed as a single flat plate, in which case two upper outer flaps 31 can be provided as usual.

[0120] In the above embodiment, an example was described in which the opening protrusions 71 are provided over the entire front edge of the top plate 3. However, the opening protrusions 71 may be provided on a part of the front edge of the top plate 3, or on the closed opening 7 described above.

[0121] Similarly, although the above embodiment was described using an example where the projections and recesses 82 are provided over the entire area of ​​the projection cut line 81, it is sufficient for only a part of the projections and recesses 82 to fit with the opening recesses and recesses 71, so they may be provided only on a part of the projection cut line 81.

[0122] In the above embodiment, the wavy opening recesses 71 were described as a trapezoidal wave, where trapezoids are rotated and arranged alternately. However, the opening recesses 71 may also be sinusoidal, sawtooth, rectangular, triangular, or the like. Furthermore, it is not limited to a wavy shape, and only one of the opening protrusions 72 and opening recesses 73 may be provided, so the opening recesses 71 as a whole may be in an inverted V shape or an arc shape.

[0123] Similarly, although the above embodiment described an example of a trapezoidal wave-shaped projection / recess 82, the projection / recess 82 may be sinusoidal, sawtooth, rectangular, triangular, or the like. Furthermore, it is not limited to a wave shape, and only one of the projection / recess 83 and projection / recess 84 may be provided, so the projection / recess 82 as a whole may be in an inverted V shape or an arc shape.

[0124] In the above embodiment, an example was described in which a pair of projection lines 81 and a pair of auxiliary lines 91 are provided in parallel to each other. However, the pair of projection lines 81 and the pair of auxiliary lines 91 may be in the shape of a V or an inverted V, and as described above, they may be bent or curved.

[0125] In the above embodiment, the amount by which the projection fold line h and the projection valley fold line j are formed close to the lower outer flap fold line e is adjusted to approximately one sheet of corrugated cardboard thickness (1 mm to 8 mm). However, although there is no limit to the amount of protrusion, it is preferable to adjust the amount of protrusion to approximately 0.5 to 2 sheets (0.5 mm to 16 mm) in order for most of the projection 8 of the upper packaging box A to fit within a plane parallel to the top plate 3 of the lower packaging box A'.

[0126] In the above embodiment, the upper outer flap 31 and the lower outer flap 41 were described as being fixed to the inner flap 53 with adhesive G, but the fixing method is not limited and adhesive tape or the like may be used. Alternatively, the positional relationship between the inner and outer flaps can be reversed, and the inner surface of the inner flap 53 can be fixed to the outer surfaces of the upper outer flap 31 and the lower outer flap 41.

[0127] A modified example of the above embodiment will be described using the corrugated cardboard 3A shown in Figure 9. That is, in the above embodiment, a wrap-around case type in which the closing part 2 is closed by an upper outer flap 31, a lower outer flap 41, and an inner flap 53 was described as an example, but the packaging box of the present invention may be a box-type assembly as shown in Figure 9.

[0128] As shown in Figure 9, the length from the base end to the tip of the upper outer flap 31 and lower outer flap 41 in the modified example is formed to extend the entire length of the closing portion 2 in the vertical direction. Furthermore, an insertion piece 32 is attached to the tip of the upper outer flap 31 via a fold line o. In addition, a slit 42 into which the insertion piece 32 is inserted is formed at the base end of the lower outer flap 41 along the lower outer flap fold line e. Furthermore, auxiliary side plates 43 are attached to the left and right edges of the lower outer flap 41 via fold lines n.

[0129] Next, the procedure for assembling the modified packaging box from the corrugated cardboard 3A shown in Figure 9 will be explained, focusing on the differences from the above embodiment. First, the lower outer flap 41 is folded upward along the lower outer flap fold line e and stands upright at a right angle from the bottom plate 4. Also, the auxiliary side plate 43 is folded along the fold line n, and its leading edges face each other.

[0130] Next, the side panel 5 is folded upward along the fold line a of the body, stands upright at a right angle from the bottom panel 4, and comes into contact with the auxiliary side panel 43 from the outside.

[0131] Next, the top plate 3 is folded along the fold line c of the body so as to face the bottom plate 4, and the upper outer flap 31 is folded downward along the fold line d of the upper outer flap, hanging down at a right angle from the top plate 3 and contacting the lower outer flap 41 from the outside.

[0132] Next, the insertion piece 32 is bent along the fold line o in a direction along the bottom plate 4 and inserted into the slit 42 provided in the bottom plate 4, and the upper outer flap 31 is fixed to the outer surface of the lower outer flap 41. As a result, the open end of the body 1 is closed and the closed part 2 is completed.

[0133] As described above, the above embodiment was described as an example in which the upper outer flap 31 and the lower outer flap 41 are fixed to the inner flap 53 with adhesive G, but there are no limitations on the fixing method, and the closing part 2 can also be fixed as a box assembly without using adhesive G or adhesive tape. [Explanation of Symbols]

[0134] A packaging box 2 Obstruction part (first side wall part) 3. Top panel (top wall section) 4. Bottom plate (bottom wall) 5 Side plate (second side wall part) 7 Opening 71 Opening uneven part 72 Opening protrusion 73 Opening recess 8 Protrusion 81 Cut line for protrusion 82 Projection uneven part 83 Protrusions and recesses 84 Protruding part 9 Auxiliary protrusion h Crease line for protrusion i Crease line for protrusion j Valley fold line for protrusion

Claims

1. A paper packaging box that can be stacked in two or more configurations, comprising: a top wall portion and a bottom wall portion facing each other; a pair of first side wall portions connecting the top wall portion and the bottom wall portion and facing each other; and a pair of second side wall portions connecting the top wall portion and the bottom wall portion and facing each other in a direction intersecting the direction in which the first side wall portions face each other. The opening provided in the top wall, A projection is provided on the bottom wall so as to protrude outward from the bottom wall, and is formed in a position that fits into the opening of the other packaging box when stacked with the other packaging box facing downwards, An opening projection or an opening recess is provided on the edge of the opening, along the second side wall of the top wall, which narrows the width of the opening in the direction in which the pair of second side wall portions of the opening face each other, A packaging box characterized by having a projection recess provided on the projection, which fits with the opening projection provided on the opening of the other packaging box in a plane parallel to the top wall of the other packaging box when stacked with the other packaging box on the bottom, or a projection that fits with the opening recess.

2. In the packaging box according to claim 1, The packaging box is characterized in that the opening extends from the top wall portion to the first side wall portion.

3. In the packaging box according to claim 2, The packaging box is characterized in that the opening is provided extending from one of the pair of first side walls through the top wall to the other.

4. In the packaging box according to claim 3, The opening is provided with a wavy opening with multiple opening protrusions and opening recesses arranged alternately. The bottom wall portion is provided with a pair of protrusions adjacent to each of the pair of first side wall portions. The packaging box is characterized in that the protrusions are provided with a wave-like arrangement of protrusions and recesses that engage with the opening recesses and recesses, with a plurality of protrusions and recesses arranged alternately on the protrusions.

5. In the packaging box according to any one of claims 1 to 4, The aforementioned protrusion is A pair of projection lines are provided extending from the bottom wall to the first side wall, A pair of projection fold lines are provided on the bottom wall and the first side wall, connecting the ends of the pair of projection cut lines, A packaging box characterized by having a valley fold line for projections provided on the bottom wall portion and connecting the intermediate portions of the pair of projection cut lines.

6. In the packaging box according to claim 1, A packaging box characterized by having an auxiliary projection provided on the bottom wall portion so as to protrude outward from the bottom wall portion, and which is formed in a position that fits into the opening of the other packaging box when stacked in a position where the other packaging box is facing downward and rotated 90° horizontally.

Images