Packing box

Abstract

To improve breakability of the top plate in a packing box that can be opened in two ways.SOLUTION: A packing box 10 includes a bottom plate 11, side plates 13A, 13B, a pair of end plates 20, a top plate 12, and an opening structure 35 for opening a part of the top plate 12; the opening structure 35 includes a pair of first breaking lines 37 that are respectively provided between a first ridge 17 between the top plate 12 and the first side plate 13A, and between a pair of second ridges 30 between the top plate 12 and the end plate 20, and a pair of second breaking lines 32a that are respectively provided along the pair of second ridges 30. The second break line 32a includes multiple first cutting lines 32b, a second cutting line 32c extending from the first cutting line 32b to the center side of the top plate 12 and a third cutting line 32d extending from the first cutting line 32b to the bottom plate 11 side of the end plate 20.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a packing box including a bottom plate, a top plate, a pair of side plates, and a pair of end plates. One of the pair of side plates, i.e., the first side plate, is composed of an inner portion continuous with the bottom plate and an outer portion continuous with the top plate. The outer portion is provided with a pair of first breaking lines inclined outward, and the top plate is provided with a pair of second breaking lines extending from the ends of the first breaking lines toward the other second side plate of the pair of side plates. Patent Document 1 discloses a first aspect in which the second breaking lines are provided at intervals with respect to the end plates, and a second aspect in which the second breaking lines are provided at the ridge portion between the top plate and the end plates.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The packing box of the first aspect of Patent Document 1 can be opened in two ways. The first opening method is to hold the unopened portion between the end plate and the second breaking line with one hand, hold the portion between the pair of first breaking lines in the outer portion with the other hand, operate to break the outer portion along the first breaking line, and then continue to break the top plate along the second breaking line. The second opening method is to hold the central portion of the bottom plate so as to sandwich the exposed inner portion with one hand after breaking the outer portion along the first breaking line, hold a part of the broken outer portion with the other hand, and operate to break the top plate along the second breaking line.

[0005] In the first opening method, no folds are created in the bottom plate and top plate from the first side plate to the second side plate, so the bottom plate and top plate do not bend. In the second opening method, folds are created in the bottom plate and top plate from the first side plate to the second side plate, starting from the gripping fingers, and the bottom plate and top plate may bend. The way the operating force is transmitted changes depending on whether or not the top plate bends, so it may not be possible to properly break the top plate along the break line. In other words, if the break line is designed assuming the first opening method, it may not be possible to properly break the top plate along the break line when operated using the second opening method. Conversely, if the break line is designed assuming the second opening method, it may not be possible to properly break the top plate along the break line when operated using the first opening method. Patent Document 1 does not consider the breakability of the top plate in a packaging box that can be opened in two ways in this manner.

[0006] The present invention aims to improve the breakability of the top panel of a packaging box that can be opened in two ways. [Means for solving the problem]

[0007] This invention packaging box The structure comprises a base plate extending in a first direction and a second direction intersecting the first direction; a pair of side plates connected to both ends of the base plate in the first direction and extending in a second direction and a third direction intersecting both the first and second directions; a pair of end plates connected to both ends of the base plate in the second direction and extending in the first and third directions; a top plate connected to the upper ends of the pair of side plates and the pair of end plates in the third direction and spaced apart from the base plate in the third direction; and an opening structure for opening by breaking at least a part of the top plate. A first ridge is formed between the top plate and the first side plate, which is one of the pair of side plates, and a second ridge is formed between the top plate and the pair of end plates. The aforementioned opening structure is The aforementioned First ridge and the above Second ridge and During Set A pair of first fracture lines are inclined toward the end plate side from the first side plate side toward the second side plate side, which is the other of the pair of side plates, and from the end of the first fracture line toward the second side plate ,one Pair The aforementionedThe plate comprises a pair of second break lines provided along the second ridge, the second break lines comprising a plurality of first cutting lines provided at intervals along the second ridge, a second cutting line provided on the first side plate side of each of the first cutting lines and extending inclined toward the center of the top plate in the second direction as it approaches the first side plate side, and a third cutting line provided on the first side plate side of the first cutting line and extending inclined toward the bottom plate side of the end plate as it approaches the first side plate side 。 Furthermore, in a first aspect of the present invention, the top plate is provided with a first fold line extending from the first side plate side to the second side plate side between the pair of first break lines, with the end on the second side plate side positioned at a distance from the second side plate; a pair of second fold lines extending from the end on the second side plate side of the first fold line, each inclined toward the end plate side as it moves toward the second side plate side; and a pair of third fold lines provided on the outside in the second direction relative to the second fold line, each inclined toward the end plate side as it moves from the second side plate side to the first side plate side. , provide packaging boxes. Furthermore, a second aspect of the present invention provides a packaging box in which a first fold line extending from the first side plate side to the second side plate side is provided between the pair of first break lines of the top plate, and a fourth fold line extending from the first side plate side to the second side plate side is provided on the bottom plate so as to correspond to the first fold line in the third direction. Furthermore, a third aspect of the present invention provides a packaging box in which the first break line comprises a plurality of first breaks that are inclined toward the end plate side as they move from the first side plate side toward the second side plate side, a second break provided between adjacent first breaks and extending along the second direction, and a third break provided adjacent to the second break line, wherein each of the first breaks consists of a plurality of cutting lines provided at intervals, each of the second breaks consists of a single continuous cutting line, and the third break consists of a single continuous cutting line.

[0008] According to this embodiment, the packaging box can be opened in two ways. The first opening method involves holding the unopened portion of the top plate on the side of the first side plate rather than the first break line with one hand, and operating it by holding the space between the pair of first break lines with the other hand. The second opening method involves holding the central portion of the bottom plate with one hand so as to sandwich the first side plate, and operating it by holding the space between the pair of first break lines with the other hand. In either opening method, after breaking the top plate along the first break line, the second edge between the top plate and the end plate can be subsequently broken along the second break line.

[0009] In the first opening method, no folds are created in the bottom plate and top plate from the first side plate to the second side plate, so the bottom plate and top plate do not bend. Therefore, when the second ridge is broken along the second break line, the break proceeds from the first cutting line towards the top plate, and connects to the second cutting line. In the second opening method, a fold is created in the bottom plate and top plate from the first side plate to the second side plate, starting from the gripping fingers, and the bottom plate and top plate may bend. Therefore, when the second ridge is broken along the second break line, the break proceeds from the first cutting line towards the end plate, and connects to the third cutting line.

[0010] Thus, in this aspect, since the second breaking line is constituted by a Y-shaped zipper including the first cutting line, the second cutting line provided on the first side plate side of the first cutting line, and the third cutting line, the top plate can be surely broken regardless of whether the first opening method or the second opening method is performed. Therefore, the breakability of the top plate in the packaging box that can be opened in two ways can be improved.

Effect of the Invention

[0011] In the present invention, the breakability of the top plate in the packaging box that can be opened in two ways can be improved.

Brief Description of the Drawings

[0012] [Figure 1] Perspective view of the packaging box according to the first embodiment of the present invention. [Figure 2] Bottom view of the packaging box of FIG. 1. [Figure 3] Enlarged view of part III of FIG. 2. [Figure 4] Plan view showing the blank of the packaging box of FIG. 1. [Figure 5] Enlarged view of part V of the blank of FIG. 4. [Figure 6] Perspective view showing a process when manufacturing the packaging box. [[ID=三十二]] [Figure 7] Perspective view showing the first opening method. [Figure 8] Partial plan view of FIG. 7 [Figure 9] Perspective view showing the first opened state of the packaging box. [Figure 10] Perspective view showing the second opening method. [Figure 11] Partial plan view of FIG. 10. [Figure 12] Perspective view showing the second opened state of the packaging box. [Figure 13] Perspective view of the packaging box according to the second embodiment. [Figure 14] Plan view showing the blank of the packaging box of FIG. 13. [Figure 15] Enlarged view of part XV of the blank of FIG. 十四. [Figure 16] Perspective view showing the second opening method of the packaging box of the second embodiment. [Figure 17] A perspective view showing the second opened state of the packaging box of the second embodiment. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described below with reference to the drawings.

[0014] (First Embodiment) Referring to Figure 1, the packaging box 10 according to the first embodiment of the present invention is a post-in-case sized to fit into a mailbox. In the attached drawing, the X direction is the width direction of the packaging box 10 and is the first direction of the present invention. The Y direction is the length direction of the packaging box 10 and is the second direction of the present invention. The Z direction is the height (thickness) direction of the packaging box 10 and is the third direction of the present invention.

[0015] Referring to Figure 1, the width dimension X of the packaging box 10 is smaller than the length dimension Y, and the height dimension Z is smaller than the width dimension X. The width dimension X of the packaging box 10 is set in the range of 115 mm to 230 mm, and in this embodiment it is set to 225 mm. The length dimension Y of the packaging box 10 is set in the range of 230 mm to 340 mm, and in this embodiment it is set to 310 mm. The height dimension Z of the packaging box 10 is set in the range of 20 mm to 100 mm, preferably 20 mm to 40 mm, and in this embodiment it is set to 24 mm.

[0016] The packaging box 10 is formed by folding and gluing a single blank sheet, as shown in Figure 4, at predetermined points. The blank is formed by punching out a corrugated cardboard sheet using a well-known paper box punching machine. The corrugated cardboard sheet has a well-known configuration in which a corrugated core is placed between the front liner (outer surface of the packaging box 10) and the back liner (inner surface of the packaging box 10). When the packaging box 10 is a post-in case, a corrugated cardboard sheet with a thickness of 0.5 mm to 3.0 mm is used. The parts indicated by dashed lines in Figure 4 are general-purpose creases formed by cutting from the back liner side to compress the thickness. The parts indicated by solid lines in Figure 4 are cutting lines formed by cutting from the back liner to the front liner, and shape lines (edges) formed by punching.

[0017] Referring to Figure 1, the packaging box 10 comprises a bottom plate 11, a top plate 12, side plates 13A, 13B, and a pair of lid walls (end plates) 20.

[0018] The base plate 11 and the top plate 12 are both formed into roughly identical rectangular shapes extending along the XY plane and are spaced apart in the height direction Z. However, the base plate 11 and the top plate 12 do not need to be geometrically strictly aligned along the XY plane, as long as they can be manufactured as a packaging box 10.

[0019] The side panels 13A and 13B are both formed in a roughly identical rectangular shape extending along the YZ plane and are spaced apart in the width direction X. However, the side panels 13A and 13B do not need to be geometrically strictly aligned along the YZ plane, as long as they can be used to manufacture the packaging box 10.

[0020] Referring to Figures 1 and 2, the side plates 13A and 13B are continuous with the bottom plate 11 at both ends in the width direction X via bent portions 16 extending in the length direction Y, and are continuous with the top plate 12 at both ends in the width direction X via bent portions 17 extending in the length direction Y.

[0021] The side panel (first side panel) 13A consists of the side panel body 14 and the joint 15, which are attached together with an adhesive such as a hot melt resin. The side panel (second side panel) 13B consists of a single sheet of corrugated cardboard. Referring to Figure 4, the side panel body 14, the bottom panel 11, the side panel 13B, the top panel 12, and the joint 15 are arranged in this order from top to bottom.

[0022] Referring to Figure 4, the side plate body 14 and the side plate 13B are connected to the top and bottom of the base plate 11 via fold lines 16a that constitute the folded portion 16. The fold line 16a consists of a plurality of general-purpose creases 18 spaced apart in the length direction Y, and cutting lines 19 provided between adjacent general-purpose creases 18. Adjacent cutting lines 19 are formed with a gap that makes them difficult to break and difficult to connect with each other under external force. The cutting lines 19 are arc-shaped, connected to adjacent general-purpose creases 18, and protrude outward in the width direction X beyond the general-purpose creases 18.

[0023] The top and bottom of the top plate 12 are connected to the side plate 13B and the joint 15 via folding curves 17a and 17b that constitute the folding section 17. The folding curve 17a between the top plate 12 and the side plate 13B is composed of multiple general-purpose creases 18 and cutting lines 19 provided between adjacent general-purpose creases 18, similar to the folding curve 16a. The folding curve 17b between the top plate 12 and the joint 15 consists of a lead crease comprising a general-purpose crease extending in the longitudinal direction Y and multiple cutting lines provided on this general-purpose crease at intervals in the longitudinal direction Y. The adjacent cutting lines of the folding curve 17b are formed at intervals that make it difficult for them to connect with each other and break under external force.

[0024] Referring to Figure 1, the pair of lid walls 20 are both formed in the same rectangular shape extending along the XZ plane and are spaced apart in the length direction Y. However, the lid walls 20 do not need to extend along the XZ plane in a geometrically strict sense, as long as they can be manufactured as a packaging box 10.

[0025] The lid wall 20 is connected to the top plate 12, the bottom plate 11, and the side plates 13A and 13B, respectively, and closes the openings at both ends in the longitudinal direction Y defined by these plates. Each lid wall 20 comprises an inner plate 21, a pair of adhesive pieces 22 positioned on the outer surface of the inner plate 21, and a covering plate 23 positioned on the outer surfaces of the inner plate 21 and the adhesive pieces 22, respectively. After the pair of adhesive pieces 22 are attached to the outer surface of the inner plate 21 with an adhesive such as a heat-melt resin, the covering plate 23 is attached to the outer surface of the inner plate 21 and the outer surfaces of the pair of adhesive pieces 22 with an adhesive such as a heat-melt resin. However, the adhesive pieces 22 may also be attached to the inner surface of the inner plate 21.

[0026] Both the inner plate 21 and the covering plate 23 are elongated strips, and the pair of adhesive pieces 22 are generally trapezoidal. The height Z dimension of both the inner plate 21 and the covering plate 23 is smaller than the height Z dimension of the side plates 13A and 13B, and larger than half the height Z dimension of the side plates 13A and 13B. The height Z dimension of the adhesive piece 22 is smaller than the height Z dimension of the inner plate 21.

[0027] Referring to Figures 1 and 2, the inner plate 21 is connected to the bottom plate 11 via a bent portion 24. The pair of adhesive pieces 22 are connected to the side plates 13A and 13B, respectively, via a bent portion 29. The covering plate 23 is connected to the top plate 12 via a bent portion 30.

[0028] Referring to Figures 2 and 3, the bent portion 24 between the bottom plate 11 and the inner plate 21 comprises a pair of bent portions 25 and a single bent portion 26, and extends as a whole in the width direction X. A punched portion 27 is provided between each of the bent portions 25 and 26. The pair of bent portions 25 and the single bent portion 26 are spaced apart in the length direction Y, and the punched portions 27 are formed to establish this positional relationship.

[0029] Referring to Figures 4 and 6, the pair of inner plates 21 are connected to both sides of the bottom plate 11 in the longitudinal direction Y via the fold curve 25a that constitutes the fold portion 25 and the fold curve 26a that constitutes the fold portion 26.

[0030] Referring to Figures 2 and 3, the bent portions 25 are provided at both ends of the inner plate 21 in the width direction X, corresponding to the adhesive pieces 22, and extend in the width direction X. The length of the bent portions 25 in the width direction X is formed to be greater than or equal to the total length of the adhesive piece 22 in the width direction X. Referring to Figure 4, the fold line 25a constituting the bent portion 25 consists of a lead crease with a pair of cutting lines spaced apart on a general-purpose crease, similar to the fold line 17b.

[0031] Referring to Figures 2 and 3, the folded portion 26 is provided with a gap on the outside in the longitudinal direction Y relative to the folded portion 25, and extends in the width direction X between the pair of folded portions 25. Both ends of the folded portion 26 and the ends of the pair of folded portions 25 are positioned at the same location in the width direction X, and are spaced apart in the longitudinal direction Y. Referring to Figure 4, the fold line 26a constituting the folded portion 26 is made of a lead line, similar to the fold line 17b, with multiple cutting lines spaced apart on a general-purpose crease. The step dimension, which is the gap between the fold line 25a and the fold line 26a, is preferably set to the thickness of one corrugated cardboard sheet.

[0032] Referring to Figures 2 and 3, the punched-out portion 27 consists of a cutting line that penetrates a portion of both the base plate 11 and the inner plate 21, and is provided to partially allow deformation of the inner plate 21 in the longitudinal direction Y. Parts of the punched-out portion 27 are connected to the bent portion 25 and the bent portion 26, respectively, extending in the longitudinal direction Y on the base plate 11 and in the height direction Z on the inner plate 21. Referring to Figures 4 and 6, the upper end of the punched-out portion 27 on the inner plate 21 side is positioned at a distance from the upper edge of the inner plate 21. Between the upper end of the punched-out portion 27 and the upper edge of the inner plate 21, a fold line 28 is provided to facilitate the formation of a step difference between the portion of the inner plate 21 corresponding to the bent portion 25 and the portion corresponding to the bent portion 26.

[0033] Referring to Figures 1 and 3, the bent portion 29 between the side plates 13A and 13B and the adhesive piece 22 extends in the height direction Z. Referring to Figures 4 and 6, a total of four adhesive pieces 22 are connected to both sides of the side plate 13B and the side plate body 14 in the length direction Y, via the fold lines 29a that constitute the bent portion 29. The fold line 29a, like the fold line 17b, consists of a lead crease with multiple cutting lines spaced apart on a general-purpose crease.

[0034] Referring to Figure 1, the bent portion 30 between the top plate 12 and the covering plate 23 comprises a non-breakable portion 31 that is difficult to break by the application of external force, and two types of breakable portions 32 and 33 that can be broken by the application of external force, and extends linearly in the width direction X as a whole. These are provided in the order of breakable portion 33, non-breakable portion 31, and breakable portion 32 from the side plate 13A toward the side plate 13B. Referring to Figures 1 and 4, the covering plate 23 is connected to both sides of the top plate 12 in the length direction Y via the bend curve 31a that constitutes the non-breakable portion 31, the break line 32a that constitutes the breakable portion 32, and the break line 33a that constitutes the breakable portion 33.

[0035] Referring to Figure 1, the non-breakable portion 31 is located on the side plate 13A side, more specifically in the region adjacent to the side plate 13A when the bent portion 30 is divided into three equal parts. Referring to Figures 1 and 4, the fold line 31a constituting the non-breakable portion 31 consists of a lead line composed of a general-purpose crease and multiple cutting lines. Adjacent cutting lines are formed with a gap that makes them difficult to break and difficult to connect with each other under external force.

[0036] Referring to Figure 1, the fractured portion 32 is located on the side plate 13B side of the non-fractured portion 31, more specifically, in an area other than the region adjacent to the side plate 13A when the bent portion 30 is divided into three equal parts. Referring to Figures 1 and 4, the fracture line 32a constituting the fractured portion 32 consists of a Y-zipper with multiple Y-shaped cutting lines spaced apart to allow for fracture, and constitutes part of the opening structure 35 which will be described in detail later. Here, the space at which fracture is possible means the distance at which adjacent Y-shaped cutting lines can connect to each other by fracture due to the application of an external force.

[0037] Referring to Figure 1, the fractured portion 33 is provided on the side plate 13A side of the non-fractured portion 31. Referring to Figures 1 and 4, the fracture line 33a constituting the fractured portion 33 consists of a perforating blade with multiple straight-line cutting lines spaced apart to allow for fracture, and constitutes part of the opening structure 35 which will be described in detail later. The breakable interval here refers to the distance at which adjacent straight-line cutting lines can connect to each other due to fracture caused by the application of an external force.

[0038] Next, an example of a method for manufacturing the packaging box 10 will be described.

[0039] First, in the blank state shown in Figure 4, a pair of inner plates 21 are bent relative to the base plate 11 along the fold lines 25a and 26a, respectively. As a result, the inner plate 21 extends partially along the XZ plane from the bent portion 25 and partially along the XZ plane from the bent portion 26, and the portion corresponding to the punched portion 27 is curved in an S-shape. In other words, a step is formed in the inner plate 21 between the portion corresponding to the bent portion 25 and the portion corresponding to the bent portion 26.

[0040] Next, the side plate 13B and the side plate body 14 are folded along the fold line 16a relative to the bottom plate 11. Then, the adhesive pieces 22 are folded along the fold line 29a relative to the side plate 13B and the side plate body 14, and the adhesive pieces 22 are attached to the outer surface of the inner plate 21 with adhesive. This results in the sealing process shown in Figure 6. In this state, the outer surface of the part of the inner plate 21 corresponding to the folded portion 26 is located further out in the length direction Y than the outer surface of the part corresponding to the folded portion 25, and is approximately flush with the outer surface of the adhesive piece 22.

[0041] Next, after placing items on the bottom plate 11, the top plate 12 is folded along the curve 17a relative to the side plate 13B. Then, a pair of covering plates 23 are folded relative to the top plate 12, and the covering plates 23 are attached to the outer surfaces of the inner plate 21 and the adhesive piece 22 with adhesive. In addition, the joint 15 is folded relative to the top plate 12, and the joint 15 is attached to the outer surface of the side plate body 14 with adhesive. This completes the sealed packaging box 10 shown in Figure 1.

[0042] Referring to Figures 2 and 3, in the sealed packaging box 10, there is no step between the outer surface of the inner plate 21 and the outer surface of the adhesive piece 22. Therefore, the adhesion of the covering plate 23 to the inner plate 21 and the adhesive piece 22 can be improved. Moreover, since the outer surface of the inner plate 21 and the outer surface of the adhesive piece 22 can be arranged flush, the outermost covering plate 23 can also be attached in a flat state without any irregularities, and the packaging box 10 can be manufactured to the external dimensions as designed. Furthermore, no gap due to a step is formed between the inner plate 21 and the covering plate 23. Therefore, the sealing performance of the lid wall 20, which consists of the inner plate 21, the pair of adhesive pieces 22, and the covering plate 23, can be improved.

[0043] Referring to Figures 1 and 4, the packaging box 10 configured in this way is provided with an opening structure 35 for opening the top panel 12.

[0044] The opening structure 35 comprises one operating section 36, a pair of break lines (first break lines) 37, and a pair of second break lines. Of these, the pair of second break lines are formed by the break lines 32a provided in the folding section 30. The opening structure 35 is also provided with folding curves 42-45 to facilitate the breaking of the top plate 12 along the break lines 37,32a.

[0045] The operating section 36 is located in the center of the joint 15 in the longitudinal direction Y. The operating section 36 is separated from the rest of the joint 15 by a pair of break lines 36a that extend from the tip of the joint 15 (the lower end in Figure 1) toward the bent section 17 between it and the top plate 12. The upper ends of each pair of break lines 36a are adjacent to the ends of the pair of break lines 37, respectively, and are positioned with a breakable distance between them. Here, the breakable distance means the distance at which the upper end of the break line 36a and the end of the break line 37 can connect to each other by breaking due to the application of an external force.

[0046] Referring to Figure 5, the fracture line 36a consists of a single zipper with multiple L-shaped cutting lines, each having two types of cutting lines 36b and 36c, spaced apart to allow for fracture. Here, the fractureable spacing refers to the distance over which adjacent L-shaped cutting lines can connect to each other by fracture due to the application of an external force. Cutting line 36b is inclined outward in the longitudinal direction Y of the joint 15 from the bottom to the top. Cutting line 36c extends from the lower end of the other cutting line 36b toward the center in the longitudinal direction Y of the joint 15.

[0047] Referring to Figures 1 and 4, the pair of break lines 37 are provided on the top plate 12 so as to be located between the bent portion (first ridge) 17 between the top plate 12 and the side plate 13A, and between the bent portion (second ridge) 30 between the top plate 12 and the lid wall 20. The pair of break lines 37 extend outward in the longitudinal direction Y from the side plate 13A to the side plate 13B, that is, inclined toward the nearby lid wall 20. Each individual break line 37 consists of a first break portion 38 located on the bent portion 17 side and a second break portion 39 located on the bent portion 30 side.

[0048] Referring to Figures 1 and 5, the first break section 38 consists of a single zipper with multiple L-shaped cutting lines, each having two types of cutting lines 38a and 38b, provided at breakable intervals. The multiple cutting lines 38a are provided at intervals in the width direction X and are arranged so as they approach the side plate 13B they approach the lid wall 20. Each individual cutting line 38a extends along the length direction Y. Parts of adjacent cutting lines 38a overlap when viewed from the width direction X. The cutting line 38b is connected to the outer end of the cutting line 38a in the length direction Y and extends in the width direction X toward the side plate 13B. The end of the cutting line 38b on the side plate 13B is positioned at a breakable interval from the cutting line 38a of the adjacent L-shaped cutting line. However, the first break section 38 may be composed only of the multiple cutting lines 38a without providing the cutting line 38b.

[0049] The second break section 39 is provided in the outer region of the top plate 12 in the longitudinal direction Y, more specifically in the region adjacent to the end plate 20 when the top plate 12 is divided into 12 equal parts in the longitudinal direction Y. The second break section 39 consists of a Y-zipper with a plurality of Y-shaped cutting lines having a first cutting line (fourth cutting line) 39a, a second cutting line (fifth cutting line) 39b, and a third cutting line (sixth cutting line) 39c, provided at breakable intervals. The first cutting line 39a is provided at an interval between the outer end of the first break section 38 in the longitudinal direction Y and the end of the break line 32a on the side plate 13A side, so as to form a straight line overall. The second cutting line 39b is connected to the end of the first cutting line 39a on the first break section 38 side and extends toward the center of the top plate 12 in the longitudinal direction Y. The third cutting line 39c is connected to the end of the first cutting line 39a on the first fractured portion 38 side and extends toward the side plate 13A side.

[0050] A pair of break lines 32a extend along the bent portion 30 from the outer end of the break line 37 in the longitudinal direction Y toward the bent portion 17 of the side plate 13B. More specifically, the break line 32a is provided across two regions located on the side plate 13B side when the bent portion 30 is divided into three equal parts. The break line 32a consists of a Y-zipper with multiple Y-shaped cut lines having a first cut line 32b, a second cut line 32c, and a third cut line 32d, provided at breakable intervals. The first cut line 32b is provided at intervals along the bent portion 30 so as to form a straight line overall. The second cut line 32c is connected to the end of the first cut line 32b on the side plate 13A side and extends inclined toward the center in the longitudinal direction Y of the top plate 12 as it approaches the side plate 13A side. The third cutting line 32d is connected to the end of the first cutting line 32b on the side plate 13A side, and extends inclined toward the bottom plate 11 side of the covering plate 23 as it approaches the side plate 13A side.

[0051] At the ends of the pair of fracture lines 32a on the side of the second side plate 13B, there is a fracture line 40 that slopes toward the center in the longitudinal direction Y from the lid wall 20 to the side plate 13B. The fracture line 40 consists of a single zipper with multiple L-shaped cutting lines having two types of cutting lines, provided at intervals that allow for breaking. Of these, one cutting line is connected to the end of the other cutting line on the side of the lid wall 20 and extends toward the lid wall 20.

[0052] Referring to Figures 1, 9, and 12, the area enclosed by the pair of break lines 37, the pair of break lines 32a, and the bent portion 17 between the top plate 12 and the side plate 13B is the opening portion 12a of the top plate 12. The area enclosed by the break line 37, the non-break portion 31 and the break portion 33, and the bent portion 17 between the top plate 12 and the side plate 13A, that is, the area on the side plate 13A side of the break line 37, is the non-opening portion 12b of the top plate 12. Of these, the non-opening portion 12b is provided with a break line 41 extending from the break line 37 to the break line 33a, and after opening the opening portion 12a, the non-opening portion 12b can be further opened by breaking along the break lines 41 and 33a. The break line 41 consists of a single zipper with multiple L-shaped cutting lines.

[0053] Referring to Figures 1 and 2, the first fold line (first fold line) 42 is provided between a pair of break lines 37 on the top plate 12. The fourth fold line (fourth fold line) 43 is provided on the bottom plate 11 so as to correspond to the fold line 42 in the height direction Z. Referring to Figure 4, the fold lines 42 and 43 each consist of general-purpose lines and extend linearly from the vicinity of the fold lines 17a and 16a on the side plate 13A side to the side plate 13B side. The ends of the fold lines 42 and 43 on the side plate 13B side are located in the central region when the top plate 12 and bottom plate 11 are each divided into three equal parts in the width direction X, and are positioned at a distance from the side plate 13B. Referring to Figures 1 and 5, a fifth fold line (fifth fold line) 46, corresponding to the fold lines 42 and 43, is also provided in the center of the length direction Y of the joint 15, extending in the height direction Z.

[0054] Referring to Figures 1 and 4, a pair of folding curves (second folding curve) 44 are provided on the top plate 12 so as to be connected to the end of the folding curve 42 on the side plate 13B side. However, the folding curves 44 may be provided at a distance from the folding curve 42. Each pair of folding curves 44 consists of a general-purpose crease and extends in a direction that moves away from each other as it approaches the side plate 13B side from the folding curve 42, that is, inclined toward the lid wall 20 side. Referring to Figure 5, the end of the folding curve 44 on the side plate 13B side is located at a distance from the bent portion 17a. Also, the end of the folding curve 44 on the side plate 13B side is located approximately in the middle between the folding curve 42 and the break line 32a in the length direction Y.

[0055] Referring to Figures 1 and 4, a pair of folding curves (third folding curve) 45 are provided on the outside in the longitudinal direction Y relative to folding curve 44. Each pair of folding curves 45 consists of a general-purpose crease and extends in a direction that moves away from each other as it moves from the side plate 13B side toward the side plate 13A side, that is, toward the lid wall 20 side. Referring to Figure 5, the end of the side plate 13B of the folding curve 45 is positioned at a distance from the bent portion 17a. If folding curves 44 and 45 are extended, they intersect on the bent portion 17a. The outer end of the folding curve 45 in the longitudinal direction Y is positioned at a distance from the break line 32a. Also, the outer end of the folding curve 45 is located in the region adjacent to the side plate 13B when the top plate 12 is divided into four equal parts in the width direction X.

[0056] The packaging box 10, configured as described above, can be opened in two ways.

[0057] For example, the first opening method involves holding the unopenable portion 12b of the top plate 12, indicated by the dashed line in Figure 7, with the left hand and operating the control unit 36 ​​with the right hand. The second opening method involves first operating the control unit 36 ​​to break the joint 15 along the break line 36a, then holding the central portion of the bottom plate 11, indicated by the dashed line in Figure 10, with the left hand so as to sandwich the side plate 13A, and operating the control unit 36 ​​with the right hand. In either opening method, after the top plate 12 is broken along the break line 37, the bent portion 30 between the top plate 12 and the lid wall 20 is subsequently broken along the break line 32a.

[0058] Specifically, as shown in Figure 7, in the first opening method, the operator first holds the pair of break lines 36a and lifts the operating part 36 upward. This causes the splice 15 to break along the pair of break lines 36a.

[0059] Next, the top plate 12 is broken along the first break section 38 of the break line 37. At this time, the first break section 38 has multiple cutting lines 38a provided at intervals in the width direction X, and the break proceeds from the outer end in the length direction Y of each cutting line 38a through the cutting line 38b in the direction in which the operating section 36 is operated toward the side plate 13B. Since adjacent first break sections 38 overlap when viewed from the width direction X, they are connected to each other by breaking without derailing.

[0060] Once the top plate 12 is broken along the first breaking section 38, it is subsequently broken along the second breaking section 39. At this time, the break proceeds from the outer end of each first cutting line 39a in the longitudinal direction Y, in the direction in which the operating section 36 is operated, that is, in the longitudinal direction Y of the top plate 12. Since the second breaking section 39 consists of a Y zipper, as shown in Figure 8, it connects without derailment to the second cutting line 39b of the adjacent Y-shaped cutting line located in the direction in which the break is progressing.

[0061] Once the top plate 12 is broken along the second fracture section 39, the bent section 30 between the top plate 12 and the lid wall 20 is subsequently broken along the fracture line 32a. At this time, the break proceeds inward in the longitudinal direction Y of the top plate 12 from the end of each first cutting line 32b on the side plate 13B side. Since the fracture line 32a consists of a Y zipper, it connects without deviating to the second cutting line 32c of the adjacent Y-shaped cutting line located in the direction in which the break is progressing.

[0062] Once the breakage of the bent portion 30 along the break line 32a is complete, the top plate 12 is subsequently broken along the break line 40, and as shown in Figure 9, the packaging box 10 can be opened with the unopened portion 12b of the top plate 12 remaining.

[0063] As shown in Figure 10, in the second opening method, the joint 15 is broken along a pair of break lines 36a by operating the operating part 36. In this state, if the center of the bottom plate 11 and the top plate 12 on the side plate 13A side is held, a crease is created in the bottom plate 11 and the top plate 12 from the side plate 13A to the side plate 13B, starting from the gripping fingers, and the bottom plate 11 and the top plate 12 can be bent. At this time, since the bottom plate 11, the top plate 12, and the joint 15 are provided with fold lines 43, 42, and 46 respectively, the positions of these folds can be determined, and bending at unintended positions can be suppressed.

[0064] Next, when the top panel 12 is operated, the top panel 12 is broken along the first break portion 38 of the break line 37. The breaking of the top panel 12 by the first break portion 38 at this time is the same as in the first opening method.

[0065] Once the top plate 12 has finished breaking along the first breaking section 38, it continues to break along the second breaking section 39. At this time, the break proceeds outward along the length Y of the top plate 12 from the outer end of each first cutting line 39a due to the bending of the top plate 12. Since the second breaking section 39 consists of a Y-zipper, as shown in Figure 11, it connects without derailing to the third cutting line 39c of the adjacent Y-shaped cutting line located in the direction in which the break is progressing.

[0066] Once the top plate 12 has broken along the second break section 39, the bent section 30 between the top plate 12 and the lid wall 20 is subsequently broken along the break line 32a. At this time, the break from the side plate 13B end of each first cutting line 32b progresses outward in the longitudinal direction Y of the top plate 12 due to the bending of the top plate 12. Since the break line 32a consists of a Y zipper, it connects without derailing to the third cutting line 32d of the adjacent Y-shaped cutting line located in the direction in which the break is progressing.

[0067] Generally, the side plate 13B side of the fracture line 32a is far from the position where the top plate 12 is operated, so force tends to be difficult to transmit to it. In contrast, in this embodiment, the side plate 13B side of the top plate 12 is provided with fold lines 44 and 45 that form an overall M shape, so that the bending of the top plate 12 along these lines causes a tensile force to act such that the top plate 12 is displaced away from the lid wall 20. Therefore, the bent portion 30 can be reliably fractured along the fracture line 32a all the way to the side plate 13B side.

[0068] Once the breakage of the bent portion 30 along the break line 32a is complete, the top plate 12 is subsequently broken along the break line 40, and as shown in Figure 12, the packaging box 10 can be opened with the unopened portion 12b of the top plate 12 remaining.

[0069] In the opened state shown in Figures 9 and 12, to further open the unopened portion 12b, the break edge along the break line 37 is held and operated upwards. This breaks the unopened portion 12b along the break line 41 and the bent portion 30 along the break line 33a, thereby further opening the remaining portion of the top plate 12.

[0070] The packaging box 10 configured in this way has the following features.

[0071] The packaging box 10 of this embodiment can be opened in two ways. In the first opening method, no folds are created in the bottom plate 11 and top plate 12 from the side plate 13A toward the side plate 13B, so the bottom plate 11 and top plate 12 do not bend. Therefore, when the bent portion 30 is broken along the break line 32a, the break proceeds from the first cutting line 32b toward the top plate 12, and connects to the second cutting line 32c. In the second opening method, folds are created in the bottom plate 11 and top plate 12 from the side plate 13A toward the side plate 13B, starting from the gripping fingers, and the bottom plate 11 and top plate 12 may bend. Therefore, when the bent portion 30 is broken along the break line 32a, the break proceeds from the first cutting line 32b toward the lid wall 20, and connects to the third cutting line 32d.

[0072] Thus, the break line 32a is composed of a Y-zipper comprising a first cutting line 32b and a second cutting line 32c and a third cutting line 32d provided on the side plate 13A side of the first cutting line 32b. Therefore, the top plate 12 can be reliably broken regardless of whether the first or second opening method is used. Thus, the breakability of the top plate 12 in the packaging box 10, which can be opened in two ways, can be improved.

[0073] In the case where the top plate 12 does not fold, as in the first opening method, and in the case where the top plate 12 folds, as in the second opening method, the way the operating force is transmitted may change even in the area of ​​the top plate 12 near the lid wall 20. In response to this, the break line 37 comprises a first break section 38 located on the side plate 13A side and a second break section 39 located on the lid wall 20 side, and the second break section 39 is composed of a Y-zipper comprising a plurality of first cutting lines 39a and a second cutting line 39b and a third cutting line 39c provided at the end of the first cutting line 39a on the first break section 38 side. Therefore, when breaking the top plate 12 along the second breaking section 39, in the first opening method, the break proceeds from the first cutting line 39a inward to the second cutting line 39b, and in the second opening method, the break proceeds from the first cutting line 39a outward to the third cutting line 39c. Thus, regardless of whether the first or second opening method is used, the top plate 12 can be reliably broken.

[0074] The first breaking section 38 comprises multiple cutting lines 38a spaced apart in the width direction X, with portions of adjacent cutting lines 38a overlapping when viewed from the width direction X. When breaking the top plate 12 along the first breaking section 38, in either the first or second opening method, the break proceeds from the end of the cutting line 38a towards the side plate 13B, connecting to the adjacent cutting line 38a that partially overlaps when viewed from the width direction X. Therefore, the top plate 12 can be reliably broken regardless of whether the first or second opening method is used. Moreover, since the first breaking section 38 consists of multiple cutting lines 38a extending in the length direction Y, the area of ​​the unopened portion 12b of the top plate 12 can be reduced compared to when the entire first breaking section 38 is an inclined breaking section, allowing the top plate 12 to be opened more widely.

[0075] The side panel 13A comprises a side panel body 14 connected to the bottom panel 11 and a joint 15 connected to the top panel 12. The joint 15 is provided with operating parts 36 adjacent to the ends of a pair of breaking lines 37. As a result, the top panel 12 can be easily broken along the breaking lines 37 and 32a by operating the operating parts 36 of the joint 15.

[0076] A fold line 42 is provided between a pair of break lines 37 of the top panel 12, extending from the side panel 13A to the side panel 13B. This allows the position where the top panel 12 folds when the second opening method is performed to be determined by the formation of the fold line 42. Therefore, it is possible to suppress the top panel 12 from folding at an unintended position, and the transmission of the operating force can be made more uniform compared to when the fold line 42 is not provided. As a result, the top panel 12 can be reliably broken along the break line 37 and the break line 32a.

[0077] A pair of fold curves 44 and a pair of fold curves 45 are provided on the side plate 13B side of the fold curve 42, forming an M shape. This allows a tensile force to be applied away from the lid wall 20 when the top plate 12 is bent along the fold curve 42 to the fold curve 45, causing the portion close to the side plate 13B to break along the break line 32a. Thus, the top plate 12 can be reliably broken along the break line 32a.

[0078] The bottom plate 11 is provided with a fold line 42 and a corresponding fold line 43. This allows the position where the bottom plate 11 folds when the second opening method is performed to be determined by the formation position of the fold line 43. Therefore, it is possible to prevent the bottom plate 11 from folding at an unintended position, and the transmission of the operating force can be made more uniform compared to when the fold line 43 is not provided. As a result, the top plate 12 can be reliably broken along the break line 37 and the break line 32a.

[0079] Other embodiments and various modifications of the present invention will be described below, but unless otherwise specified, they will be the same as in the first embodiment. In the drawings referred to below, the same elements as in the first embodiment are denoted by the same reference numerals.

[0080] (Second Embodiment) Referring to Figure 13, the packaging box 10 of the second embodiment differs from the packaging box 10 of the first embodiment shown in Figure 1 only in the configuration of the pair of break lines (first break line) 37.

[0081] Referring to Figures 13 and 14, the pair of fracture lines 37, as in the first embodiment, extend outward in the longitudinal direction Y from the side plate 13A to the side plate 13B. Each fracture line 37 comprises a plurality of first fractures 50, a plurality of second fractures 51, and one third fracture 52. The plurality of first fractures 50 and the plurality of second fractures 51 are alternately provided on the side plate 13A side, and the one third fracture 52 is provided adjacent to the lid wall 20.

[0082] The first fracture section 50 is straight and slopes toward the lid wall 20 as it moves from the side plate 13A to the side plate 13B. However, the first fracture section 50 may be curved as long as it does not hinder the fracture of the top plate 12. One of the multiple (three in this embodiment) first fracture sections 50 is provided adjacent to the joint 15. The other first fracture sections 50 are provided at intervals in the width direction X and are arranged so as they approach the side plate 13B they approach the lid wall 20. Referring to Figure 15, each first fracture section 50 consists of a sewing blade with multiple straight cutting lines 50a provided at intervals that allow for fracture. Between adjacent cutting lines 50a, there is a continuous section 50b that is not punched out.

[0083] If the total length of the cutting line 50a is made excessively long, the rigidity of the top plate 12 will be weakened, and if the total length of the cutting line 50a is made excessively short, the fracture of the top plate 12 along the first fracture portion 50 may become unstable. If the total length of the continuous portion 50b is made excessively long, the fracture may proceed in an unintended direction from the end of the cutting line 50a on the lid wall 20 side, and may not connect to the adjacent cutting line 50a. If the total length of the continuous portion 50b is made excessively short, the top plate 12 may break immediately due to external force. For this reason, the total length of each cutting line 50a is preferably formed in the numerical range of 1.0 mm to 2.0 mm, and in this embodiment it is formed at 1.3 mm. The total length of the continuous portion 50b is preferably formed in the numerical range of 1.0 mm to 1.5 mm, and in this embodiment it is formed at 1.2 mm. More specifically, when the thickness of the corrugated cardboard sheet is 2 mm, it is preferable that the total length of the continuous section 50b be formed within the numerical range of 1.0 mm to 1.2 mm, and when the thickness of the corrugated cardboard sheet is 3 mm, it is preferable that the total length of the continuous section 50b be formed within the numerical range of 1.2 mm to 1.5 mm.

[0084] The second break section 51 is provided between adjacent first break sections 50 and extends along the length direction Y as a whole. The length direction Y in which the second break section 51 extends is perpendicular to the width direction X in which the opening operation is performed. Therefore, if the second break section 51 is made of the same perforating blade as the first break section 50, the break may proceed in an unintended direction, and adjacent cutting lines may not connect. For this reason, the second break section 51 is made of a single continuous cutting line 51a.

[0085] The third fracture section 52, like the second fracture section 39 shown in Figure 1, is located in the outer region of the top plate 12 in the longitudinal direction Y, more specifically in the region adjacent to the end plate 20 when the top plate 12 is divided into 12 equal parts in the longitudinal direction Y. The third fracture section 52 is linear overall, inclined towards the lid wall 20 as it moves from the side plate 12A to the side plate 13B, and is located adjacent to the fracture line 32a. The third fracture section 52 is composed of a single continuous cutting line 52a.

[0086] The top panel 12 is provided with a folding curve 53 to improve the operability of the control panel 36. The folding curve 53 is an arc shape that protrudes from the side panel 13A to the side panel 13B and is composed of general-purpose creases.

[0087] The packaging box 10 of the second embodiment, configured in this way, can be opened in two ways, similar to the first embodiment.

[0088] Specifically, the way the operating force is transmitted in the area of ​​the top plate 12 near the lid wall 20 can differ depending on whether the top plate 12 is bent, as in the first opening method, or bent, as in the second opening method. In contrast, in this embodiment, a third fracture section 52 consisting of a continuous single cutting line 52a is provided in the area of ​​the top plate 12 near the lid wall 20, thereby preventing the fracture from progressing in an unintended direction in this area.

[0089] Furthermore, the fracture line 37 comprises a plurality of inclined first fracture sections 50 and a plurality of second fracture sections 51 extending along the longitudinal direction Y. The total length of the continuous section 50b between adjacent cutting lines 50a of the first fracture section 50 is formed to be between 1.0 mm and 1.5 mm, so that regardless of whether the first or second opening method is used, the fracture of the continuous section 50b connects the adjacent cutting lines 50a, ensuring that the top plate 12 is reliably fractured. In addition, the second fracture section 51 extending in the longitudinal direction Y perpendicular to the direction in which the top plate 12 is operated consists of a single continuous cutting line 51a, thus preventing the fracture from proceeding in an unintended direction in this section as well.

[0090] Furthermore, the present invention is not limited to the configuration of the above-described embodiment, and various modifications are possible.

[0091] For example, the opening structure 35 may be configured to break only the top plate 12 without breaking the joint 15 that constitutes the side plate 13A. In other words, a breaking line may be provided between the pair of breaking lines 37 along the bent portion 17 between the top plate 12 and the side plate 12A, and the center of one end of the top plate 12 may be used as the operating part.

[0092] The end plates are not limited to the lid wall 20 comprising an inner plate 21, a pair of adhesive pieces 22, and a covering plate 23, but can be configured to be connected to both ends of the bottom plate 11 in the longitudinal direction Y and extend along the XZ plane.

[0093] The first side panel 13A may be made from a single sheet of corrugated cardboard.

[0094] The material of the packaging box 10 is not limited to paper corrugated cardboard sheets, but may also be resin corrugated cardboard sheets. Furthermore, the material of the packaging box 10 is not limited to corrugated cardboard sheets, but may also be single-layer cardboard or resin sheets. [Explanation of Symbols]

[0095] 10 Packaging box (container) 11 Bottom plate 12 Top plate 12a Unpacked part 12b Unopened parts 13A Side plate (1st side plate) 13B Side plate (2nd side plate) 14 Side plate body (inner part) 15 passages (outer part) 16 Bend section 16a folding line 17 Bend section (first ridge) 17a,17b folding line 18 General-purpose ruled lines 19 Cutting line 20 Lid wall (end plate) 21 Inner plate 22 Adhesive piece 23 Covering plate 24 Bend section 25 Bend section 25a folding line 26 Bend section 26a folding line 27 Punching section 28 fold line 29 Bend section 29a folding line 30 Bend section (second ridge) 31 Unbroken section 31a folding line 32 Fracture section 32a Fracture line (second fracture line) 32b 1st cutting line 32c 2nd cutting line 32d 3rd cutting line 33 Fracture 33a Broken line 35 Unpacking structure 36 Operation section 36a Broken line 36b cutting line 36c cutting line 37. Fracture line (First fracture line) 38 First fracture section 38a cutting line 38b cutting line 39 Second fracture section 39a 1st cutting line (4th cutting line) 39b 2nd cutting line (5th cutting line) 39c 3rd cutting line (6th cutting line) 40 Broken line 41 Broken line 42 Folding line (1st folding line) 43 Folding line (4th folding line) 44 Folding line (second folding line) 45 Folding line (3rd folding line) 46 Folding line 50 First fracture section 50a cutting line 50b Continuous section 51 Second fracture section 51a cutting line 52 Third fracture section 52a cutting line 53 Folding line X width direction (first direction) Y: Length direction (second direction) Z: Height direction (third direction)

Claims

1. A base plate extending along a first direction and a second direction intersecting the first direction, A pair of side plates are connected to both ends of the base plate in the first direction and extend along the second direction and a third direction that intersects both the first and second directions, A pair of end plates are connected to both ends of the base plate in the second direction and extend along the first and third directions, A top plate is connected to the upper ends of the pair of side plates and the pair of end plates in the third direction, and is positioned at a distance from the bottom plate in the third direction, An opening structure for opening by breaking at least a part of the top panel Equipped with, A first ridge is formed between the top plate and the first side plate, which is one of the pair of side plates. A second ridge is formed between the top plate and the pair of end plates. The aforementioned opening structure is A pair of first fracture lines are provided between the first ridge and the second ridge, and are inclined toward the end plate side from the first side plate side toward the second side plate side, which is the other of the pair of side plates, A pair of second fracture lines are provided along a pair of second ridges extending from the end of the first fracture line toward the second side plate and Equipped with, The second broken wire is, Multiple first cutting lines are provided at intervals along the second ridge, A second cutting line is provided on the first side plate side of each of the first cutting lines, and extends inclined toward the center of the top plate in the second direction as it approaches the first side plate side, A third cutting line is provided on the first side plate side of the first cutting line and extends inclined toward the bottom plate side of the end plate as it approaches the first side plate side. Equipped with, The aforementioned top plate has, A first fold line extends from the first side plate to the second side plate between the pair of first break lines, with the end on the second side plate side positioned at a distance from the second side plate, A pair of second bends extending from the end of the first bend on the second side plate side toward the end plate side, each inclined toward the end plate side, A pair of third folds are provided on the outside in the second direction relative to the second fold, and each extends inclined toward the end plate side as it moves from the second side plate side toward the first side plate side, A packaging box that has a designated area.

2. A base plate extending along a first direction and a second direction intersecting the first direction, A pair of side plates are connected to both ends of the base plate in the first direction and extend along the second direction and a third direction that intersects both the first and second directions, A pair of end plates are connected to both ends of the base plate in the second direction and extend along the first and third directions, A top plate is connected to the upper ends of the pair of side plates and the pair of end plates in the third direction, and is positioned at a distance from the bottom plate in the third direction, An opening structure for opening by breaking at least a part of the top panel Equipped with, A first ridge is formed between the top plate and the first side plate, which is one of the pair of side plates. A second ridge is formed between the top plate and the pair of end plates. The aforementioned opening structure is A pair of first fracture lines are provided between the first ridge and the second ridge, and are inclined toward the end plate side from the first side plate side toward the second side plate side, which is the other of the pair of side plates, A pair of second fracture lines are provided along a pair of second ridges extending from the end of the first fracture line toward the second side plate and Equipped with, The second broken wire is, Multiple first cutting lines are provided at intervals along the second ridge, A second cutting line is provided on the first side plate side of each of the first cutting lines, and extends inclined toward the center of the top plate in the second direction as it approaches the first side plate side, A third cutting line is provided on the first side plate side of the first cutting line and extends inclined toward the bottom plate side of the end plate as it approaches the first side plate side. Equipped with, Between the pair of first break lines of the top plate, a first bend curve is provided, extending from the first side plate side to the second side plate side. A packaging box, wherein the bottom plate is provided with a fourth fold curve extending from the first side plate to the second side plate so as to correspond to the first fold curve in the third direction.

3. The first fracture line comprises a first fracture portion located on the first side plate side and a second fracture portion located on the end plate side. The second fractured portion is, A plurality of fourth cutting lines are provided at intervals between the end of the first fracture and the end of the second fracture line, A fifth cutting line is provided at the end of the fourth cutting line on the first break side, and extends toward the center of the top plate in the second direction, A sixth cutting line is provided at the end of the fourth cutting line on the first break side and extends toward the first side plate side. A packaging box according to claim 1 or 2, comprising the features described above.

4. The first fracture portion comprises a plurality of cutting lines provided at intervals in the first direction, arranged so as they approach the second side plate, they approach the end plate. Each of the aforementioned cutting lines extends along the second direction and partially overlaps with adjacent cutting lines when viewed from the first direction. The packaging box according to claim 3.

5. The first broken line is, A plurality of first fracture portions that are inclined toward the end plate side as they move from the first side plate side toward the second side plate side, A second fracture portion is provided between adjacent first fracture portions and extends along the second direction, A third fracture portion is provided adjacent to the second fracture line. Equipped with, Each of the first fracture sections consists of a plurality of cutting lines provided at intervals, Each of the aforementioned second fractures consists of a single continuous cutting line. The third fracture portion consists of a single continuous cutting line. The packaging box according to claim 1 or 2.

6. A base plate extending along a first direction and a second direction intersecting the first direction, A pair of side plates are connected to both ends of the base plate in the first direction and extend along the second direction and a third direction that intersects both the first and second directions, A pair of end plates are connected to both ends of the base plate in the second direction and extend along the first and third directions, A top plate is connected to the upper ends of the pair of side plates and the pair of end plates in the third direction, and is positioned at a distance from the bottom plate in the third direction, An opening structure for opening by breaking at least a part of the top panel Equipped with, A first ridge is formed between the top plate and the first side plate, which is one of the pair of side plates. A second ridge is formed between the top plate and the pair of end plates. The aforementioned opening structure is A pair of first fracture lines are provided between the first ridge and the second ridge, and are inclined toward the end plate side from the first side plate side toward the second side plate side, which is the other of the pair of side plates, A pair of second fracture lines are provided along a pair of second ridges extending from the end of the first fracture line toward the second side plate and Equipped with, The second broken wire is, Multiple first cutting lines are provided at intervals along the second ridge, A second cutting line is provided on the first side plate side of each of the first cutting lines, and extends inclined toward the center of the top plate in the second direction as it approaches the first side plate side, A third cutting line is provided on the first side plate side of the first cutting line and extends inclined toward the bottom plate side of the end plate as it approaches the first side plate side. Equipped with, The first broken line is, A plurality of first fracture portions that are inclined toward the end plate side as they move from the first side plate side toward the second side plate side, A second fracture portion is provided between adjacent first fracture portions and extends along the second direction, A third fracture portion is provided adjacent to the second fracture line. Equipped with, Each of the first fracture sections consists of a plurality of cutting lines provided at intervals, Each of the aforementioned second fractures consists of a single continuous cutting line. The third break portion consists of a single continuous cutting line, in the packaging box.

7. The packaging box according to claim 6, wherein the total length of the continuous portion between adjacent cutting lines among the plurality of cutting lines of the first fracture is 1.0 mm or more and 1.5 mm or less.

8. The first side plate comprises an inner portion connected to the bottom plate and an outer portion connected to the top plate and fixed to the outside of the inner portion. The outer portion is provided with an operating section for breaking the top plate, adjacent to the ends of the pair of first breaking lines. A packaging box according to any one of claims 1, 2, or 6.

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