Packing box

Abstract

To provide a packaging box that can be easily opened across its entire top surface while maintaining structural integrity. [Solution] The packaging box B1 includes an outer flap break section 51 that facilitates cutting of the ridge R11 between the top plate 10 and the upper outer flap 33, a pair of inner flap break sections that facilitate cutting of each of the pair of inner flaps, the pair of inner flap break sections extending along the boundary between the upper outer flap 33 and the lower outer flap 34, a pair of top plate break sections 71, 72 that facilitate cutting of the pair of ridges R21, R22 between the top plate 10 and the length side plates 40A, 40B, and a central break section 81 that facilitates cutting of the central part of the upper outer flap 33, the central break section 81 extending from the outer flap break section 51 to the lower edge of the upper outer flap 33. The pair of length side plates 40A, 40B do not have break sections that facilitate cutting of the pair of length side plates 40A, 40B.

Description

Technical Field

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[0001] The present invention relates to a packing box.

Background Art

[0002] Conventionally, in a packing box in which a top plate, a bottom plate, two opposing side plates, and cover plates closing both ends are connected in series, there is known one in which breakable strip-shaped zippers are formed on the two side plates and the cover plates connected to each of the two side plates (Patent Document 1). In this technique, the entire upper surface of the packing box can be easily opened by cutting off the zipper.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a box having a structure in which a top plate, a bottom plate, two opposing side plates, and cover plates closing both ends are connected in series, the strength against the load from above is ensured by the two side plates. However, since the breakable zipper is formed on the two side plates in the conventional packing box, there is a risk that the strength against the load from above may decrease.

[0005] Therefore, it is desired that the entire upper surface of the packing box can be easily opened and the strength of the packing box can be ensured.

Means for Solving the Problems

[0006] The packaging box comprises a rectangular top plate, a rectangular bottom plate opposite the top plate, a first side plate connecting the first edges of the top plate and the bottom plate, a pair of second side plates connecting a pair of second edges adjacent to the first edge of the top plate and a pair of second edges adjacent to the first edge of the bottom plate, and a third side plate connecting a third edge opposite to the first edge of the top plate and a third edge opposite to the first edge of the bottom plate. The first side plate has a pair of inner flaps extending from each of the pair of second side plates, an upper outer flap extending from the top plate and fixed to the pair of inner flaps, and a lower outer flap extending from the bottom plate and fixed to the pair of inner flaps. The packaging box further comprises: a first break for facilitating the cutting of a first edge between the top plate and the upper outer flap; a pair of second breaks for facilitating the cutting of each of the pair of inner flaps, the pair of second breaks extending along the boundary between the upper outer flap and the lower outer flap; a pair of third breaks for facilitating the cutting of a pair of second edges between the top plate and the pair of second side plates; and a fourth break for facilitating the cutting of the central part of the upper outer flap, the fourth break extending from the first break to the lower edge of the upper outer flap. The pair of second side plates do not have a break portion that facilitates cutting of the pair of second side plates.

[0007] The packaging box has a first break section, a pair of second break sections, a pair of third break sections, and a fourth break section. When opening the packaging box, the top of the first side panel can be opened along the fourth break section, and then opened in both directions along the first and second break sections. After that, the top panel can be easily opened by separating it from the second side panel along the third break section, allowing the entire top surface of the packaging box to be opened. Furthermore, the strength of the packaging box can be ensured by the pair of second side panels not having break sections.

[0008] The packaging box may further include a fifth break portion that facilitates the cutting of a pair of third edges between the pair of second side plates and the pair of inner flaps, the fifth break portion extending along the third edges from the first break portion to the second break portion.

[0009] The packaging box is equipped with a fifth break section, which allows the upper part of the first side panel to be easily separated from the second side panel along the fifth break section when opening the packaging box.

[0010] The packaging box may further include a sixth break section that facilitates cutting of a pair of third edges between the pair of second side panels and the pair of inner flaps, and a seventh break section that facilitates cutting of a pair of fourth edges between the pair of second side panels and the third side panels.

[0011] The packaging box, with its sixth break section, allows the upper part of the first side panel to be easily separated from the second side panel along the upper part of the sixth break section when opening the box. Furthermore, the packaging box, with both a sixth and a seventh break section, makes it easier to open the box flat when disposing of it by breaking the sixth and seventh break sections.

[0012] The packaging box comprises a rectangular top plate, a rectangular bottom plate opposite the top plate, a first side plate connecting the first edges of the top plate and the bottom plate, a pair of second side plates connecting a pair of second edges adjacent to the first edge of the top plate and a pair of second edges adjacent to the first edge of the bottom plate, and a third side plate connecting a third edge opposite to the first edge of the top plate and a third edge opposite to the first edge of the bottom plate. The first side plate has a pair of inner flaps extending from each of the pair of second side plates, an upper outer flap extending from the top plate and fixed to the pair of inner flaps, and a lower outer flap extending from the bottom plate and fixed to the pair of inner flaps. The packaging box further comprises: a first break for facilitating the cutting of a first edge between the top plate and the upper outer flap; a pair of second breaks for facilitating the cutting of each of the pair of inner flaps, the pair of second breaks extending along the boundary between the upper outer flap and the lower outer flap; a pair of third breaks for facilitating the cutting of a pair of second edges between the top plate and the pair of second side plates; and a fourth break for facilitating the cutting of one of a pair of third edges between the pair of second side plates and the pair of inner flaps, the fourth break extending along the third edge from the first break to the second break. The pair of second side plates do not have a break portion that facilitates cutting of the pair of second side plates.

[0013] The packaging box has a first break section, a pair of second break sections, a pair of third break sections, and a fourth break section. When opening the packaging box, the upper part of the first side panel can be separated from one of the second side panels along the fourth break section, and then opened towards the other second side panel along the first and second break sections. Subsequently, the top panel can be separated from the second side panel along the third break section, allowing the entire top surface of the packaging box to be easily opened. Furthermore, the strength of the packaging box can be ensured by the absence of break sections in the pair of second side panels.

[0014] The packaging box may further include a fifth break portion that facilitates the cutting of the other of the pair of third edges, the fifth break portion extending along the third edge from the first break portion to the second break portion.

[0015] The packaging box, with its fifth break section, allows the upper part of the first side panel to be opened to the other second side panel when opening the box from the fourth break section, and then easily separated from the other second side panel along the fifth break section. Furthermore, the packaging box, with its fifth break section, also allows the upper part of the first side panel to be separated from the other second side panel along the fifth break section when opening the box, and then opened towards one of the second side panels along the first and second break sections. In other words, the upper part of the first side panel can be opened from either side in the width direction.

[0016] The packaging box may further include a sixth breaking portion that facilitates the cutting of the pair of third ridge portions, the sixth breaking portion including the fourth breaking portion, and a seventh breaking portion that facilitates the cutting of a pair of fourth ridge portions between the pair of second side plates and the third side plate.

[0017] By providing the packaging box with the sixth breaking portion, when opening the packaging box, the upper part of the first side plate can be easily separated from the other second side plate along the upper part of the sixth breaking portion. Also, by providing the packaging box with the sixth breaking portion, when opening the packaging box, the upper part of the first side plate can be separated from the other second side plate along the upper part of the sixth breaking portion and opened towards one of the second side plates along the first breaking portion and the second breaking portion. That is, the upper part of the first side plate can be opened from either direction in the width direction. Further, by providing the packaging box with the sixth breaking portion and the seventh breaking portion, when disposing of the packaging box, by breaking the sixth breaking portion and the seventh breaking portion, the packaging box can be easily opened flat.

[0018] The packaging box may further include an eighth breaking portion that facilitates the cutting of a fifth ridge portion between the top plate and the third side plate.

[0019] By providing the packaging box with the eighth breaking portion, when opening the packaging box, the top plate can be easily separated from the third side plate along the eighth breaking portion.

Advantages of the Invention

[0020] The entire upper surface of the packaging box can be easily opened, and the strength of the packaging box can be ensured.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view showing a packaging box according to the first embodiment. [Figure 2] It is a perspective view showing a breaking portion of the packaging box according to the first embodiment. [Figure 3] It is a view showing a blank sheet of the packaging box according to the first embodiment. [Figure 4]Perspective views (a) and (b) for explaining the opening of the packaging box according to the first embodiment. [Figure 5] Perspective view (a) showing the state where the packaging box is opened and perspective view (b) showing the state where the packaging box is opened flat. [Figure 6] Perspective view showing the packaging box according to the second embodiment. [Figure 7] Perspective view showing the broken part of the packaging box according to the second embodiment. [Figure 8] View (a) of the blank sheet of the packaging box according to the second embodiment as seen from the front side and view (b) as seen from the back side. [Figure 9] Perspective views (a) and (b) for explaining the opening of the packaging box according to the second embodiment.

Mode for Carrying Out the Invention

[0022] Next, the first embodiment will be described. As shown in FIGS. 1 and 2, the packaging box B1 includes a top plate 10, a bottom plate 20, a pair of width-side plates 30A and 30B, and a pair of length-side plates 40A and 40B. The packaging box B1 has a symmetrical structure with respect to a plane orthogonal to the length direction of the box (hereinafter simply referred to as the "length direction").

[0023] The top plate 10 and the bottom plate 20 have a quadrilateral shape. In the embodiment, the top plate 10 and the bottom plate 20 have a rectangular shape that is long in the length direction. The bottom plate 20 faces the top plate 10 in the height direction of the box (hereinafter simply referred to as the "height direction").

[0024] The pair of width-side plates 30A and 30B face each other in the length direction. The width-side plate 30A is provided so as to connect the short sides 10A and 20A of the top plate 10 and the bottom plate 20. The width-side plate 30B is provided so as to connect the short side 10B of the top plate 10 and the short side 20B of the bottom plate 20.

[0025] The pair of length-side panels 40A and 40B face each other in the width direction of the box (hereinafter simply referred to as the "width direction"). Length-side panel 40A is provided to connect the long side 10C of the top panel 10 and the long side 20C of the bottom panel 20. Length-side panel 40B is provided to connect the long side 10D of the top panel 10 and the long side 20D of the bottom panel 20.

[0026] The length side panel 40A is connected to the top panel 10 by a joint 41 formed to extend from the long side 10C of the top panel 10. The length dimensions of the length side panels 40A and 40B are greater than the width dimensions of the width side panels 30A and 30B.

[0027] The side panels 30A and 30B have a symmetrical structure. Specifically, each of the side panels 30A and 30B has a pair of inner flaps 31 and 32, an upper outer flap 33, and a lower outer flap 34.

[0028] A pair of inner flaps 31 and 32 extend from each of the pair of length-face side plates 40A and 40B. More specifically, inner flap 31 extends from the longitudinal end of length-face side plate 40A toward the inside in the width direction, and inner flap 32 extends from the longitudinal end of length-face side plate 40B toward the inside in the width direction.

[0029] The upper outer flap 33 extends downward from the longitudinal edge of the top plate 10. The upper outer flap 33 covers the top of the pair of inner flaps 31 and 32. The upper outer flap 33 is fixed to the pair of inner flaps 31 and 32. Specifically, the upper outer flap 33 is bonded to the pair of inner flaps 31 and 32 with adhesive.

[0030] The lower outer flap 34 extends upward from the longitudinal end of the base plate 20. The lower outer flap 34 covers the lower part of the pair of inner flaps 31 and 32. The lower outer flap 34 is fixed to the pair of inner flaps 31 and 32. Specifically, the lower outer flap 34 is bonded to the pair of inner flaps 31 and 32 with adhesive.

[0031] Packaging box B1 has edges R11, R12, R21, R22, R31, R32, R33, and R34.

[0032] Ridge R11 is the ridge between the top plate 10 and the side plate 30A. More specifically, ridge R11 is the ridge between the top plate 10 and the upper outer flap 33 of the side plate 30A. Ridge R12 is the ridge between the top plate 10 and the side plate 30B. More specifically, ridge R12 is the ridge between the top plate 10 and the upper outer flap 33 of the side plate 30B.

[0033] The edges R21 and R22 are a pair of edges between the top plate 10 and the pair of length-side plates 40A and 40B. More specifically, edge R21 is the edge between the top plate 10 and the length-side plate 40A. Furthermore, edge R21 is the edge between the top plate 10 and the joint 41. Edge R22 is the edge between the top plate 10 and the length-side plate 40B.

[0034] The edges R31 and R32 are a pair of edges between a pair of length-face side plates 40A and 40B and a width-face side plate 30A. More specifically, the edges R31 and R32 are a pair of edges between a pair of length-face side plates 40A and 40B and a pair of inner flaps 31 and 32 of the width-face side plate 30A. In more detail, edge R31 is the edge between the length-face side plate 40A and the inner flap 31 of the width-face side plate 30A, and edge R32 is the edge between the length-face side plate 40B and the inner flap 32 of the width-face side plate 30A.

[0035] The edges R33 and R34 are a pair of edges between a pair of length-face side plates 40A and 40B and a width-face side plate 30B. More specifically, the edges R33 and R34 are a pair of edges between a pair of length-face side plates 40A and 40B and a pair of inner flaps 31 and 32 of the width-face side plate 30B. In more detail, edge R33 is the edge between the length-face side plate 40A and the inner flap 31 of the width-face side plate 30B, and edge R34 is the edge between the length-face side plate 40B and the inner flap 32 of the width-face side plate 30B.

[0036] The packaging box B1 further comprises two outer flap breaks 51, 52, two pairs of inner flap breaks 61, 62, a pair of top breaks 71, 72, two central breaks 81, 82, and four vertical breaks 91, 92, 93, 94. In this embodiment, each break is, for example, a perforation.

[0037] The outer flap break portion 51 is a perforation that facilitates cutting of the ridge portion R11. The outer flap break portion 51 extends in the width direction along the ridge portion R11. The outer flap break section 52 is a perforation that facilitates cutting of the ridge R12. The outer flap break section 52 extends in the width direction along the ridge R12.

[0038] The pair of inner flap perforations 61 and 62 are perforations that facilitate cutting of the pair of inner flaps 31 and 32, respectively. Specifically, inner flap perforation 61 facilitates cutting at the upper and lower boundary of inner flap 31, and inner flap perforation 62 facilitates cutting at the upper and lower boundary of inner flap 32. Inner flap perforation 61 extends in the width direction near the center in the height direction of inner flap 31, along the boundary between the upper outer flap 33 and the lower outer flap 34. Inner flap perforation 62 extends in the width direction near the center in the height direction of inner flap 32, along the boundary between the upper outer flap 33 and the lower outer flap 34.

[0039] The pair of perforations 71 and 72 on the top plate facilitate cutting the pair of edges R21 and R22. Specifically, perforation 71 facilitates cutting edge R21, and perforation 72 facilitates cutting edge R22. Perforation 71 extends longitudinally along edge R21, and perforation 72 extends longitudinally along edge R22.

[0040] The central break sections 81 and 82 are perforations that facilitate cutting the central part of the upper outer flap 33 in the width direction. The central break section 81 extends almost vertically from the outer flap break section 51 to the lower edge of the upper outer flap 33 of the width side plate 30A, near the center in the width direction. The central break section 82 extends almost vertically from the outer flap break section 52 to the lower edge of the upper outer flap 33 of the width side plate 30B, near the center in the width direction. The central break sections 81 and 82 have finer perforations than the other break sections to facilitate tearing. In the first embodiment, the central break sections 81 and 82 have a symmetrical shape.

[0041] The longitudinal fractures 91 and 92 are perforations that facilitate cutting of a pair of edges R31 and R32, and extend along the edges R31 and R32. Specifically, the longitudinal fracture 91 facilitates cutting of edge R31, and the longitudinal fracture 92 facilitates cutting of edge R32. The longitudinal fracture 91 extends in the height direction along edge R31, and the longitudinal fracture 92 extends in the height direction along edge R32.

[0042] The longitudinal fractures 93 and 94 are perforations that facilitate cutting of a pair of edges R33 and R34, and extend along the edges R33 and R34. More specifically, the longitudinal fracture 93 facilitates cutting of edge R33, and the longitudinal fracture 94 facilitates cutting of edge R34. The longitudinal fracture 93 extends in the height direction along edge R33, and the longitudinal fracture 94 extends in the height direction along edge R34.

[0043] The pair of length-face side panels 40A and 40B do not have a breakable section that facilitates cutting of the pair of length-face side panels 40A and 40B. Specifically, the length-face side panel 40A does not have a breakable section that can be easily broken, such as a perforation, inside the rectangular area enclosed by the top panel breakable section 71 (edge ​​R21), the pair of vertical breakable sections 91 and 93 (a pair of edges R31 and R33), and the lower edge of the length-face side panel 40A. Similarly, the length-face side panel 40B does not have a breakable section that can be easily broken, such as a perforation, inside the rectangular area enclosed by the top panel breakable section 72 (edge ​​R22), the pair of vertical breakable sections 92 and 94 (a pair of edges R32 and R34), and the lower edge of the length-face side panel 40B.

[0044] Packaging box B1 can be assembled from a blank sheet S1 as shown in Figure 3. The blank sheet S1 is, for example, made of corrugated cardboard. In the blank sheet S1, the direction corresponding to the length of the length side panels 40A and 40B is the flow direction of the corrugated cardboard sheet, and the direction corresponding to the height of the length side panels 40A and 40B is the paper width direction of the corrugated cardboard sheet. The flow direction is perpendicular to the corrugations of the corrugated cardboard sheet, and the paper width direction is parallel to the corrugations of the corrugated cardboard sheet. The strength of the corrugated cardboard sheet in the paper width direction is greater than the strength in the flow direction. More specifically, the strength of the corrugated cardboard sheet when compressed in the paper width direction is greater than the strength of the corrugated cardboard sheet when compressed in the flow direction.

[0045] Packaging box B1 can be assembled by first setting the product G (see Figure 4(b)) on the bottom plate 20 which is in the state of a blank sheet S1, then folding the length side plates 40A, 40B, the top plate 10, and the joint 41, and fixing the joint 41 to the outer surface of the length side plate 40A. Next, the inner flaps 31, 32 and outer flaps 33, 34 are folded, and the outer flaps 33, 34 are fixed to the outer surfaces of the inner flaps 31, 32. In this embodiment, product G is, for example, instant noodles.

[0046] Next, the effects and advantages of the packaging box B1 according to the first embodiment will be described. As shown in Figures 1 and 2, the strength of the packaging box B1 can be ensured by the fact that the pair of length-face side plates 40A and 40B do not have a break point that would facilitate cutting of the length-face side plates 40A and 40B. Specifically, the strength of the packaging box B1 against loads from above can be ensured.

[0047] Furthermore, since the packaging box B1 is equipped with an outer flap break section 51, a pair of inner flap break sections 61, 62 of the width side plate 30A, a pair of top plate break sections 71, 72, and a central break section 81, when opening the packaging box B1, as shown in Figure 4(a), the upper part of the width side plate 30A can be opened along the central break section 81, and the outer flap break section 51 and the inner flap break sections 61, 62 can be opened to both sides in the width direction.

[0048] As shown in Figure 4(b), once the top of the width side panel 30A is opened, the top panel 10 can be easily separated from the length side panels 40A and 40B along the top panel breaks 71 and 72, thereby allowing the entire top surface of the packaging box B1 to be opened.

[0049] Since the packaging box B1 is equipped with vertical break sections 91 and 92 (see Figure 2), when opening the packaging box B1, the upper part of the width side plate 30A can be easily separated from the length side plates 40A and 40B along the vertical break sections 91 and 92, as shown in Figure 5(a).

[0050] Furthermore, since the packaging box B1 is equipped with an outer flap break section 52 (see Figure 2), when opening the packaging box B1, the top plate 10 can be easily separated from the width side plate 30B along the outer flap break section 52.

[0051] The packaging box B1 is equipped with vertical break sections 91-94 (see Figure 2), so when disposing of the packaging box B1, the vertical break sections 91-94 can be broken, making it easy to open the packaging box B1 flat, as shown in Figure 5(b).

[0052] In the first embodiment, for example, the width side panel 30A corresponds to the "first side panel," the short side 10A of the top panel 10 corresponds to the "first edge of the top panel," and the short side 20A of the bottom panel 20 corresponds to the "first edge of the bottom panel." Also, the pair of length side panels 40A and 40B correspond to the "pair of second side panels," the long sides 10C and 10 of the top panel 10 correspond to the "pair of second edges adjacent to the first edge of the top panel," and the long sides 20C and 20D of the bottom panel 20 correspond to the "pair of second edges adjacent to the first edge of the bottom panel." Furthermore, the width side panel 30B corresponds to the "third side panel," the short side 10B of the top panel 10 corresponds to the "third edge opposite to the first edge of the top panel," and the short side 20B of the bottom panel 20 corresponds to the "third edge opposite to the first edge of the bottom panel."

[0053] Furthermore, the outer flap fracture 51 corresponds to the "first fracture," and the ridge R11 corresponds to the "first ridge." Also, the pair of inner flap fractures 61, 62 formed on the pair of inner flaps 31, 32 of the width side plate 30A correspond to the "pair of second fractures." Furthermore, the pair of top plate fractures 71, 72 correspond to the "pair of third fractures," and the pair of ridges R21, R22 correspond to the "pair of second ridges." Furthermore, the central fracture 81 corresponds to the "fourth fracture."

[0054] Furthermore, the longitudinal fractures 91 and 92 correspond to the "sixth fracture," and the pair of edges R31 and R32 correspond to the "pair of third edges." Also, of the longitudinal fractures 91 and 92, the portion extending from the outer flap fracture 51 to the inner flap fractures 61 and 62 corresponds to the "fifth fracture." Furthermore, the longitudinal fractures 93 and 94 correspond to the "seventh fracture," and the pair of edges R33 and R34 correspond to the "pair of fourth edges." Furthermore, the outer flap fracture 52 corresponds to the "eighth fracture," and edge R12 corresponds to the "fifth edge."

[0055] In the first embodiment, the packaging box B1 is provided with an outer flap break 52, a pair of inner flap breaks 61, 62, and a central break 82 on the width side panel 30B side, so that the entire top surface of the packaging box B1 can be easily opened not only from the width side panel 30A side, but also from the width side panel 30B side. That is, when opening the packaging box B1, the top of the width side panel 30B can be opened along the central break 82, and then opened in both directions along the width along the outer flap break 52 and the inner flap breaks 61, 62 of the width side panel 30B. After that, the top panel 10 can be separated from the length side panels 40A, 40B along the top panel breaks 71, 72, so that the entire top surface of the packaging box B1 can be easily opened from the width side panel 30B side as well.

[0056] Next, a second embodiment will be described. In the following description, the differences from the first embodiment will be the main focus, and the same components as in the first embodiment will be denoted by the same reference numerals and their descriptions will be omitted.

[0057] As shown in Figures 6 and 7, the packaging box B2 comprises a top plate 10, a bottom plate 20, a pair of width-side plates 30A, 30B, and a pair of length-side plates 40A, 40B. The packaging box B2 has a symmetrical structure with respect to a plane perpendicular to the length direction.

[0058] The packaging box B2 further comprises two outer flap breaks 51, 52, two pairs of inner flap breaks 61, 62, a pair of top panel breaks 71, 72, and four vertical breaks 91, 92, 93, 94. In the second embodiment, the packaging box B2 does not have central breaks 81, 82 (see Figures 1 and 2).

[0059] The longitudinal fracture portion 91 includes the upper part 91A of the longitudinal fracture portion, and the longitudinal fracture portion 92 includes the upper part 92A of the longitudinal fracture portion. The upper part 91A of the longitudinal fracture portion is the upper part of the longitudinal fracture portion 91. The upper part 91A of the longitudinal fracture portion extends along the ridge R31 from the outer flap fracture portion 51 to the inner flap fracture portion 61 of the width side plate 30A. The upper part 92A of the longitudinal fracture portion is the upper part of the longitudinal fracture portion 92. The upper part 92A of the longitudinal fracture portion extends along the ridge R32 from the outer flap fracture portion 51 to the inner flap fracture portion 62 of the width side plate 30A. In the second embodiment, the upper parts 91A and 92A of the longitudinal fracture portion have symmetrical shapes.

[0060] Furthermore, the longitudinal fracture portion 93 includes the upper part 93A of the longitudinal fracture portion, and the longitudinal fracture portion 94 includes the upper part 94A of the longitudinal fracture portion. The upper part 93A of the longitudinal fracture portion is the upper part of the longitudinal fracture portion 93. The upper part 93A of the longitudinal fracture portion extends along the ridge R33 from the outer flap fracture portion 52 to the inner flap fracture portion 61 of the width side plate 30B. The upper part 94A of the longitudinal fracture portion is the upper part of the longitudinal fracture portion 94. The upper part 94A of the longitudinal fracture portion extends along the ridge R34 from the outer flap fracture portion 52 to the inner flap fracture portion 62 of the width side plate 30B. In the second embodiment, the upper parts 93A and 94A of the longitudinal fracture portion have symmetrical shapes.

[0061] Furthermore, the upper parts 91A and 93A of the longitudinal fracture section have symmetrical shapes, and the upper parts 92A and 94A of the longitudinal fracture section also have symmetrical shapes. The upper parts 91A to 94A of the longitudinal fracture section have finer perforations than the other fracture sections to facilitate breakage. The splice 41 may have a tapered shape at its longitudinal end, for example, to expose the upper parts 91A and 93A of the longitudinal fracture section.

[0062] In the second embodiment as well, the pair of length-face side plates 40A and 40B do not have a breakable portion that facilitates cutting of the pair of length-face side plates 40A and 40B.

[0063] Packaging box B2 can be assembled from a blank sheet S2 as shown in Figures 8(a) and (b). The blank sheet S2 is, for example, made of corrugated cardboard. In the blank sheet S2, the direction corresponding to the height direction of the length side panels 40A and 40B is the paper width direction of the corrugated cardboard sheet.

[0064] Packaging box B2 can be assembled in the same way as packaging box B1. After placing the product G on the bottom plate 20 which is in the state of a blank sheet S2, the length side plates 40A, 40B, the top plate 10 and the joint 41 are folded, and the joint 41 is fixed to the outer surface of the length side plate 40A. Next, the inner flaps 31, 32 and the outer flaps 33, 34 are folded, and the outer flaps 33, 34 are fixed to the outer surfaces of the inner flaps 31, 32.

[0065] Next, the effects and benefits of the packaging box B2 according to the second embodiment will be explained. As shown in Figures 6 and 7, the pair of length-side plates 40A and 40B do not have a longitudinal break that would facilitate cutting of the length-side plates 40A and 40B, thereby ensuring the strength of the packaging box B2 against loads from above.

[0066] Furthermore, since the packaging box B1 is equipped with an outer flap break section 51, a pair of inner flap break sections 61, 62 of the width side plate 30A, a pair of top plate break sections 71, 72, and the upper part of the vertical break section 92A, when opening the packaging box B2, as shown in Figure 9(a), the upper part of the width side plate 30A can be separated from the length side plate 40B along the upper part of the vertical break section 92A, and it can be opened towards the length side plate 40A along the outer flap break section 51 and the inner flap break sections 62, 61.

[0067] As shown in Figure 9(b), once the top of the width side panel 30A is opened, the top panel 10 can be easily separated from the length side panels 40A and 40B along the top panel breaks 71 and 72, thereby allowing the entire top surface of the packaging box B2 to be opened.

[0068] Since the packaging box B2 is equipped with a vertical break section upper part 91A, when opening the packaging box B2 from the vertical break section upper part 92A (see Figure 7), the upper part of the width side plate 30A can be opened up to the length side plate 40A, and then easily separated from the length side plate 40A along the vertical break section upper part 91A (see Figure 5(a)).

[0069] Furthermore, as shown in Figure 7, since the packaging box B2 is equipped with a vertical break section upper part 91A, when opening the packaging box B2, the upper part of the width side panel 30A (see Figure 6) can be separated from the length side panel 40A along the vertical break section upper part 91A, and opened towards the length side panel 40B along the outer flap break section 51 and the inner flap break sections 61, 62. In other words, the upper part of the width side panel 30A can be opened from either side in the width direction.

[0070] The packaging box B2 is equipped with vertical break sections 91-94, making it easy to open the packaging box B2 flat when disposing of it by breaking the vertical break sections 91-94 (see Figure 5(b)).

[0071] In the second embodiment, for example, the upper part 92A of the longitudinal fracture corresponds to the "fourth fracture," and the ridge R32 corresponds to "one of the pair of third ridges." Also, the upper part 91A of the longitudinal fracture corresponds to the "fifth fracture," and the ridge R31 corresponds to "the other of the pair of third ridges."

[0072] In the second embodiment, the packaging box B2 is provided with an outer flap break section 52, a pair of inner flap break sections 61 and 62, and upper vertical break sections 93A and 94A on the side of the width side panel 30B, so that the entire top surface of the packaging box B2 can be easily opened not only from the side of the width side panel 30A, but also from the side of the width side panel 30B.

[0073] In other words, the upper part of the width side panel 30B can be separated from the length side panel 40A along the upper part of the vertical break 93A, and opened towards the length side panel 40B along the outer flap break 52 and the inner flap breaks 61, 62. Alternatively, the upper part of the width side panel 30B can be separated from the length side panel 40B along the upper part of the vertical break 94A, and opened towards the length side panel 40A along the outer flap break 52 and the inner flap breaks 62, 61. After that, by separating the top panel 10 from the length side panels 40A, 40B along the top panel breaks 71, 72, the entire top surface of the packaging box B2 can be easily opened from the width side panel 30B side as well.

[0074] The embodiments have been described above, but the packaging box can be modified as appropriate, as illustrated below.

[0075] In the first embodiment, the packaging box B1 had a central break 82 and a pair of inner flap breaks 61, 62 on the side of the width side panel 30B. However, for example, the packaging box B1 does not have to have a central break 82 and a pair of inner flap breaks 61, 62 on the side of the width side panel 30B. In other words, the packaging box does not have to have a structure that is symmetrical with respect to a plane perpendicular to the length direction.

[0076] In the first embodiment, the packaging box B1 had vertical breaks 91, 92 (the fifth and sixth breaks) and vertical breaks 93, 94 (the seventh break). However, for example, the packaging box B1 may have only the fifth break (in the first embodiment, the portion of the vertical breaks 91, 92 extending from the outer flap break 51 to the inner flap breaks 61, 62). Also, for example, the packaging box B1 may not have vertical breaks 91 to 94.

[0077] In the second embodiment, the packaging box B2 was provided with upper vertical breaks 93A, 94A and a pair of inner flap breaks 61, 62 on the side of the width side panel 30B. However, for example, the packaging box B2 does not have to be provided with upper vertical breaks 93A, 94A and a pair of inner flap breaks 61, 62 on the side of the width side panel 30B. The packaging box B2 may not have the pair of inner flap breaks 61, 62 on the side of the width side panel 30B, and may instead have vertical breaks 93, 94 similar to those in the first embodiment.

[0078] In the second embodiment, the packaging box B2 was provided with the upper part 91A (fifth break), but for example, the packaging box B2 may be provided with a vertical break 91 similar to that in the first embodiment instead of the vertical break 91 including the upper part 91A.

[0079] In the second embodiment, the packaging box B2 was provided with vertical breaks 91-94 (sixth and seventh breaks), but for example, the packaging box B2 does not have to be provided with vertical breaks 91-94. Specifically, the packaging box B2 does not have to be provided with vertical breaks 91, 93, 94 and the lower part of the vertical break 92 (the part of the vertical break 92 excluding the upper part 92A).

[0080] In this embodiment, packaging box B1 was provided with an outer flap break section 52 (eighth break section), but for example, packaging box B1 does not need to be provided with an outer flap break section 52. The same applies to packaging box B2.

[0081] In this embodiment, when assembling the packaging boxes B1 and B2, the splice 41 was first fixed to the outer surface of the length side plate 40A, and then the outer flaps 33 and 34 were fixed to the outer surfaces of the inner flaps 31 and 32. However, for example, when assembling the packaging boxes B1 and B2, the outer flaps 33 and 34 may be fixed to the outer surfaces of the inner flaps 31 and 32 first, and then the splice 41 may be fixed to the outer surface of the length side plate 40A. Also, in this embodiment, the splice 41 was fixed to the outer surface of the length side plate 40A, but for example, the splice 41 may be fixed to the inner surface of the length side plate 40A.

[0082] In this embodiment, packaging boxes B1 and B2 were used to package product G stacked in two layers. However, for example, the packaging boxes may be used to package product stacked in three or more layers, or to package product in a single layer. Also, in this embodiment, instant noodles were used as an example of product G. However, for example, the product may be packaged noodles, instant rice, soup, frozen food, confectionery, cereal, beverages, dairy products, canned goods, etc.

[0083] The elements described in the embodiments and modifications may be implemented in any combination. [Explanation of Symbols]

[0084] 10 Top plate 10A, 10B Short side 10C, 10D Long side 20 Bottom plate 20A, 20B Short side 20C, 20D Long side 30A,30B width side plate 31,32 Inner flap 33 Upper outer flap 34 Lower outer flap 40A, 40B Length side panel 51, 52 Outer flap rupture 61, 62 Inner flap rupture 71,72 Top panel fracture 81 Central fracture 91, 92, 93, 94 Longitudinal fracture section 91A, 92A Upper part of the longitudinal fracture R11,R12,R21,R22,R31,R32,R33,R34 Ridge B1,B2 Packaging box

Claims

1. A square tabletop, Opposite the aforementioned top plate is a rectangular bottom plate, A first side plate connecting the first edges of the top plate and the bottom plate, A pair of second side plates connecting a pair of second sides adjacent to the first side of the top plate and a pair of second sides adjacent to the first side of the bottom plate, A packaging box comprising a third side plate connecting a third side plate opposite to the first side of the top plate and a third side plate opposite to the first side of the bottom plate, The first side plate is, A pair of inner flaps extending from each of the pair of second side plates, An upper outer flap extending from the top plate and fixed to the pair of inner flaps, It has a lower outer flap that extends from the bottom plate and is fixed to the pair of inner flaps, A first breaking portion that facilitates cutting of the first edge between the top plate and the upper outer flap, A pair of second breaking portions for facilitating the cutting of each of the pair of inner flaps, the pair of second breaking portions extending along the boundary between the upper outer flap and the lower outer flap, A pair of third breaking portions facilitates the cutting of a pair of second edges between the top plate and the pair of second side plates, A fourth fracture portion for facilitating the cutting of the central portion of the upper outer flap, further comprising a fourth fracture portion extending from the first fracture portion to the lower edge of the upper outer flap, A packaging box characterized in that the pair of second side panels does not have a breakable portion that facilitates cutting of the pair of second side panels.

2. The packaging box according to claim 1, further comprising a fifth breaking portion for facilitating the cutting of a pair of third edges between the pair of second side plates and the pair of inner flaps, the fifth breaking portion extending along the third edges from the first breaking portion to the second breaking portion.

3. A sixth breaking portion facilitates the cutting of a pair of third edges between the pair of second side plates and the pair of inner flaps, The packaging box according to claim 1, further comprising a seventh breaking portion that facilitates the cutting of a pair of fourth edges between the pair of second side plates and the third side plate.

4. A square tabletop, Opposite the aforementioned top plate is a rectangular bottom plate, A first side plate connecting the first edges of the top plate and the bottom plate, A pair of second side plates connecting a pair of second sides adjacent to the first side of the top plate and a pair of second sides adjacent to the first side of the bottom plate, A packaging box comprising a third side plate connecting a third side plate opposite to the first side of the top plate and a third side plate opposite to the first side of the bottom plate, The first side plate is, A pair of inner flaps extending from each of the pair of second side plates, An upper outer flap extending from the top plate and fixed to the pair of inner flaps, It has a lower outer flap that extends from the bottom plate and is fixed to the pair of inner flaps, A first breaking portion that facilitates cutting of the first edge between the top plate and the upper outer flap, A pair of second breaking portions for facilitating the cutting of each of the pair of inner flaps, the pair of second breaking portions extending along the boundary between the upper outer flap and the lower outer flap, A pair of third breaking portions facilitates the cutting of a pair of second edges between the top plate and the pair of second side plates, A fourth fracture portion for facilitating the cutting of one of a pair of third edges between the pair of second side plates and the pair of inner flaps, further comprising a fourth fracture portion extending along the third edge from the first fracture portion to the second fracture portion, A packaging box characterized in that the pair of second side panels does not have a breakable portion that facilitates cutting of the pair of second side panels.

5. The packaging box according to claim 4, further comprising a fifth breaking portion for facilitating the cutting of the other of the pair of third edges, the fifth breaking portion extending along the third edge from the first breaking portion to the second breaking portion.

6. A sixth fracture portion that facilitates the cutting of the pair of third edges, comprising the sixth fracture portion including the fourth fracture portion, The packaging box according to claim 4, further comprising a seventh breaking portion that facilitates the cutting of a pair of fourth edges between the pair of second side plates and the third side plate.

7. The packaging box according to any one of claims 1 to 6, further comprising an eighth breaking portion that facilitates cutting of the fifth ridge between the top plate and the third side plate.

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