Packaging box breaking line structure

Abstract

To improve the feel of a broken edge of a packaging box formed by breaking.SOLUTION: A breaking line structure of a packaging box 1 includes a plurality of first breaking parts 41 provided at intervals along a breaking direction Db of a wall 10 to be broken. Each first breaking part 41 has: an arc-shaped first cutting line 42 that protrudes toward a second part 3; and a second cutting line 43 that is located between an apex 42c of the first cutting line 42 that protrudes most from a first part 2 and a starting end 42a and extends toward a second part 3 side. A terminating end 42b of the first cutting line 42 is located closer to the first part 2 side than a top end 43b of the second cutting line 43. The second cutting line 43 is inclined toward the starting end 42a from an angular position perpendicular to the breaking direction Db. The point where the second cutting line 43 or an extension of the second cutting line 43 intersects with the first cutting line 42 is located closer to the apex 42c side than the starting end 42a.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a breaking line structure for a packaging box. [Background technology]

[0002] The zipper (fracture line structure) disclosed in Patent Document 1 has a pair of fracture lines extending parallel to the outer peripheral wall (breakable wall) of the packaging box to be fractured, and fractures the outer peripheral wall vertically. Each fracture line has multiple fracture portions provided at intervals (via connecting portions) along the fracture direction relative to the breakable wall. Each fracture portion has a linear first slit extending along the fracture direction and a linear second slit connected to the end of the first slit on the front side in the fracture direction. The second slit slopes toward the center between the pair of fracture lines as it moves away from the first slit on the front side in the fracture direction. Patent Document 1 also discloses an embodiment having a linear third slit connected to the connecting portion between the first and second slits and extending on the opposite side from the pair of fracture lines. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6636703 Summary of the Invention [Problem to be solved by the invention]

[0004] In the fracture line structure of Patent Document 1, by pulling the strip-shaped portion between a pair of fracture lines, the connecting portion between adjacent fracture portions in the fracture direction is broken, and the fractured wall is broken. However, the fractured edge of the fractured wall caused by the fracture line of Patent Document 1 has a sawtooth shape with multiple corners formed by the first and second cuts, which causes pain when touched by the hand. In other words, the fracture line structure of Patent Document 1 leaves room for improvement in terms of the feel of the fractured edge.

[0005] An object of the present invention is to improve the feel of the broken edge of a packaging box formed by breaking. [Means for solving the problem]

[0006] The present invention provides a break line structure for a packaging box, which includes a plurality of first break portions spaced apart along a breaking direction of a breakable wall of the packaging box in order to break the breakable wall into a first portion and a second portion, each of the first break portions having a starting end located on the front side of the breaking direction and an ending end located on the rear side of the breaking direction, and including an arc-shaped first cut that protrudes toward the second portion, and a second cut that is located between the starting end and an apex of the first cut that protrudes furthest from the first portion, and extends toward the second portion, the ending end of the first cut is located closer to the first portion than an apex of the second cut that is furthest from the first cut, the second cut is inclined toward the starting end at an angle perpendicular to the breaking direction, and the point where the second cut or an extension of the second cut and the first cut intersect is located closer to the apex than the starting end.

[0007] The first breaking portion has an arc-shaped first cut that protrudes toward the second portion. As a result, the broken edge of the first portion broken along the multiple first breaking portions becomes a wavy shape with multiple arcs caused by the first cuts. Therefore, the broken edge does not cause pain when touched with the hand, and the feel of the broken edge of the packaging box formed by the breakage can be improved.

[0008] The first breaking portion has a second break extending toward the second portion between the apex of the first break that protrudes most from the first portion and the starting end. The end of the first break is located closer to the first portion than the apex of the second break. The second break is inclined toward the starting end from an angle perpendicular to the breaking direction. This allows the second break to be absorbed even if the break progresses away from the first portion when breaking the connecting portion between adjacent first breaking portions. The intersection of the second break and the first break is located closer to the apex than the starting end. This allows the break to be absorbed even if the break progresses toward the first portion when breaking the connecting portion between adjacent first breaking portions. This prevents the break from progressing in an unintended direction, and the breakable wall can be broken at the specified breaking position. [Effects of the Invention]

[0009] The present invention can improve the feel of the broken edge of the packaging box formed by breaking. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a top perspective view of a packaging box using a break line structure according to a first embodiment of the present invention; [Figure 2] FIG. 2 is a bottom perspective view of the packaging box of FIG. 1 . [Figure 3] FIG. 2 is a plan view showing a blank for the packaging box of FIG. 1; [Figure 4] An enlarged view of part IV in Figure 3. [Figure 5] FIG. [Figure 6] FIG. [Figure 7A] 10 is a schematic diagram showing a breaking state when the predetermined breaking direction and the operation direction coincide with each other. FIG. [Figure 7B] 10A and 10B are schematic diagrams showing examples of breakage states when the determined breakage direction and the operation direction do not match. [Figure 7C] 10A and 10B are schematic diagrams showing examples of breakage states when the determined breakage direction and the operation direction do not match. [Figure 8] FIG. 10 is a top perspective view of a packaging box using a break line structure according to a second embodiment. [Figure 9] FIG. 9 is a bottom perspective view of the packaging box of FIG. 8 . [Figure 10] FIG. 9 is a plan view showing a blank for the packaging box of FIG. 8. [Figure 11] FIG. 11 is a top perspective view of a packaging box using a break line structure according to a third embodiment. [Figure 12] FIG. 12 is a bottom perspective view of the packaging box of FIG. [Figure 13] FIG. 12 is a plan view showing the blank of the packaging box of FIG. 11; DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] (First embodiment) Referring to Figures 1 and 2, a packaging box 1 using the break line structure of the first embodiment of the present invention comprises a cylindrical outer wall (breakable wall) 10, a bottom wall 20 that closes the lower end opening of the outer wall 10, and a lid wall 30 that closes the upper end opening of the outer wall 10.

[0013] In the accompanying drawings, the X direction is the width direction (left-right direction), with the arrow pointing to the left and the opposite direction to the arrow pointing to the right. The Y direction is the front-to-back direction, with the arrow pointing to the front and the opposite direction to the arrow pointing to the rear. The Z direction is the height direction, with the arrow pointing to the top and the opposite direction to the arrow pointing to the bottom.

[0014] The break line structure includes a first break line 40 and a second break line 45 that are provided to surround the outer peripheral wall 10. As shown in FIG. 6 , the packaging box 1 can be broken (separated) into a lower box main body (first portion) 2 and an upper separation portion (second portion) 3 by operating a band-shaped portion 50 defined by the first break line 40 and the second break line 45. For example, the box main body 2 is placed on a display stand in a retail store while containing an item (not shown). With regard to the packaging box 1 used in this manner, in this embodiment, the first break line 40 improves the tactile feel of the broken edge of the box main body 2.

[0015] First, an overview of the packaging box 1 will be described.

[0016] The packaging box 1 shown in Figures 1 and 2 is formed by folding and pasting a single blank shown in Figure 3 at predetermined locations. The parts shown by dashed dotted lines in Figure 3 are general-purpose creases formed by scoring from the front surface (the surface located on the outside of the packaging box 1) or the back surface (the surface located on the inside of the packaging box 1) so as to compress the wall thickness. The parts shown by solid lines in Figure 3 are cutting lines or shape lines (sides) formed by cutting with a blade.

[0017] The blank shown in Figure 3 is formed by punching out a single layer of cardboard (coated cardboard) with a thickness of 0.5 mm to 1.5 mm using a known paperboard punching machine. However, the packaging box 1 may also be formed from a known paper cardboard sheet with a thickness of 0.9 mm to 5.0 mm and a corrugated core disposed between the front and back liners. It may also be formed from a resin sheet as long as it can be broken along the break lines 40 and 45.

[0018] 1 and 2, the outer peripheral wall 10 of the packaging box 1 is rectangular tubular and includes a front wall 11, a rear wall 12, and a pair of side walls 13. The front wall 11 and the rear wall 12 are connected to the pair of side walls 13 via bent portions 16 extending in the height direction. However, the front wall 11 and the rear wall 12 may also be connected to the pair of side walls 13 via chamfered walls. In other words, the outer peripheral wall 10 may be hexagonal or octagonal, or may have any polygonal shape. Hereinafter, of the pair of side walls 13, the one located on the left side of the solid line in FIG. 1 may be referred to as the left wall 13, and the one located on the right side of the dashed line in FIG. 1 may be referred to as the right wall 13.

[0019] The front wall 11 and the rear wall 12 are identical rectangular shapes extending along the XZ plane and are disposed opposite each other with a gap in the front-to-back direction. The pair of side walls 13 are identical rectangular shapes extending along the YZ plane and are disposed opposite each other with a gap in the width direction. Of these, the right side wall 13 is composed of a side wall main body 14 continuing to the front wall 11 and an attachment portion 15 continuing to the rear wall 12. The side wall main body 14 and the attachment portion 15 are adhered with, for example, a vinyl acetate emulsion adhesive.

[0020] 3, the attachment portion 15, rear wall portion 12, left side wall portion 13, front wall portion 11, and side wall main body portion 14 are connected in this order from left to right via a fold line 16a that forms the folding portion 16. The fold line 16a is formed by a general-purpose crease.

[0021] 1 and 2, the bottom wall 20 has a rectangular shape extending along the XY plane, and is composed of a pair of first flaps 21 and second flaps 22. The bottom wall 20 of this embodiment is of a one-touch type that can close the lower end opening of the outer peripheral wall 10 by opening the front wall portion 11, the rear wall portion 12, and the pair of side wall portions 13 into a cylindrical shape.

[0022] 2 and 3, the pair of first flaps 21 are generally trapezoidal in shape and are connected to the front wall 11 and the rear wall 12 via folding portions 23. The pair of first flaps 21 are connected to the lower ends of the front wall 11 and the rear wall 12 via folding lines 23a that form the folding portions 23. The first flaps 21 are connected to adhesive portions 21b via the folding lines 21a. Both folding lines 21a and 23a are formed by general-purpose creases.

[0023] The pair of second flaps 22 are generally trapezoidal in shape and are respectively connected to the pair of side wall portions 13 via folding portions 24. The pair of second flaps 22 are respectively connected to the lower ends of the pair of side wall portions 13 via folding lines 24a that form the folding portions 24. The folding lines 24a are formed by general-purpose creases.

[0024] In the blank shown in Fig. 3, the first flap 21 is mountain-folded relative to the front wall 11 and the rear wall 12, and the second flap 22 is mountain-folded relative to the left wall 13 and the side wall main body 14. In addition, the adhesive portion 21b is valley-folded relative to the first flap 21. After that, the rear wall 12 is mountain-folded relative to the left wall 13, and the side wall main body 14 is mountain-folded relative to the front wall 11. Then, the overlapping side wall main body 14 and the margin portion 15, and the adhesive portion 21b and the second flap 22 are adhered with an adhesive.

[0025] 1 and 2, a continuous outer peripheral wall 10 is formed, which is made up of a front wall 11, a rear wall 12, and a pair of side wall portions 13. When the outer peripheral wall 10 is expanded into a cylindrical shape, the first flaps 21 rotate relative to the front wall 11 and the rear wall 12, and the second flaps 22 rotate relative to the pair of side wall portions 13, thereby forming a bottom wall 20 that can close the lower end of the outer peripheral wall 10 with a single action.

[0026] 1 and 5, the cover wall 30 is configured to releasably close the upper end opening of the outer peripheral wall 10. In a sealed state, the cover wall 30 has a rectangular shape extending along the XY plane and has roughly the same dimensions as the bottom wall 20. The cover wall 30 is connected to the upper end of the rear wall 12 via a bent portion 31, and is disposed above the bottom wall 20, facing it with a gap in between.

[0027] An insertion piece 32 is connected to the tip of the lid wall 30 via a bent portion 33. Inner flaps 34 are connected to the upper ends of the pair of side wall portions 13 via bent portions 35. In the sealed state shown in FIG. 1 , the insertion piece 32 is inserted so as to overlap the inside of the front wall portion 11, and the inner flap 34 supports the underside of the lid wall 30. However, the lid wall 30 may be connected to either the front wall portion 11 or the pair of side wall portions 13. In this case, the inner flap 34 is provided on the wall portion adjacent to the wall portion to which the lid wall 30 is connected.

[0028] 3, the cover wall 30 is connected to the upper end of the rear wall 12 via a fold line 31a that constitutes the fold portion 31. The insertion piece 32 is connected to the upper end of the cover wall 30 via a fold line 33a that constitutes the fold portion 33. The inner flap 34 is connected to the upper ends of the left side wall 13 and the side wall main body 14 via fold lines 35a that constitute the fold portion 35. The fold lines 31a, 33a, and 35a are all formed by general-purpose creases.

[0029] Next, the first break line 40 and the second break line 45 that constitute the break line structure will be described in detail.

[0030] 1 to 3, the first break line 40 and the second break line 45 are provided on the outer peripheral wall 10 at a distance from each other in the height direction, and extend along a break direction Db that is determined so as to surround the outer peripheral wall 10. A continuous strip-like band portion 50 for breaking operation is provided between the first break line 40 and the second break line 45.

[0031] The band-shaped portion 50 has a starting end 50a for starting the breaking operation and a terminal end 50b for completing the breaking operation. The starting end 50a is provided at the left end of the rear wall portion 12 shown in FIG. 2. The terminal end 50b is provided at the right end of the right wall portion 13 shown in FIG. 2. The breaking directions Db of the outer peripheral wall 10 by the band-shaped portion 50 are set horizontally at the same height position. The first breaking direction Db1 of the rear wall portion 12, the second breaking direction Db2 of the left wall portion 13, the third breaking direction Db3 of the front wall portion 11, and the fourth breaking direction Db4 of the right wall portion 13 are all from left to right when the walls 11 to 13 are viewed head-on.

[0032] The first break line 40 has a plurality of first break portions 41 and is provided between the box body 2 and the band-shaped portion 50. The plurality of first break portions 41 are provided at intervals along the breaking direction Db (horizontal direction). Uncut joint portions 44 are formed between adjacent first break portions 41.

[0033] The second break line 45 has a plurality of second break portions 46 and is provided between the separation portion 3 and the strip portion 50. In other words, the second break lines 45 are provided at intervals on the separation portion 3 side of the first break line 40. The plurality of second break portions 46 are provided at intervals along the break direction Db (horizontal direction). Uncut connecting portions 49 are formed between adjacent second break portions 46.

[0034] Next, the configuration of the first breakage portion 41 provided in the first breakage line 40 will be specifically described.

[0035] 1, 2, and 4, the first fracture portion 41 includes a first cut 42 and a second cut 43, each formed by a cutting line. The first cut 42 and the second cut 43 are formed based on the fracture direction Db.

[0036] The first slits 42 have an arc shape that protrudes from the box main body 2 toward the separation section 3. The first slits 42 have a starting end 42a located on the front side of the breaking direction Db, a terminal end 42b located on the rear side of the breaking direction Db, and an apex 42c that protrudes most from the box main body 2. Of the multiple first slits 42, the starting ends 42a, terminal ends 42b, and apexes 42c are all positioned at equal intervals along the breaking direction Db. The apex 42c that protrudes most from the box main body 2 is defined as the point of contact between the first slit 42 and a line that extends parallel to the breaking direction Db and is tangent to the arc-shaped first slit 42. The first slits 42 in this embodiment have an arc shape with one radius of curvature. However, the first slits 42 may have an arc shape with two or more radii of curvature or an elliptical arc shape.

[0037] The second cut 43 is provided between the start end 42a and the apex 42c of the first cut 42 and extends from the first cut 42 toward the separating section 3. The second cut 43 has a base end 43a located on the first cut 42 and an apex end 43b farthest from the first cut 42. The base ends 43a and apex ends 43b of the multiple second cuts 43 are all located at equal intervals along the breaking direction Db. In this embodiment, the second cut 43 extends linearly. However, the second cut 43 may be arc-shaped. The base end 43a of the second cut 43 may be located at an interval relative to the first cut 42. In this case, the interval is set to a dimension that allows the second cut 43 and the first cut 42 to be connected by breaking.

[0038] The configuration of the first cut 42 and the second cut 43 will be described in more detail below with reference to FIG.

[0039] The start end 42a of the first slit 42 is located lower than the end end 42b (i.e., closer to the box body 2) in the height direction perpendicular to the breaking direction Db. If the distance S1 between the start end 42a and the end end 42b is made excessively small, when the breakage of the connecting portion 44 progresses downward, it may be difficult for the first slit 42 of the rear first breaking portion 41 in the breaking direction Db to absorb the breakage. If the distance S1 is made excessively large, the rigidity of the outer peripheral wall 10 may be excessively reduced. For this reason, the distance S1 between the start end 42a and the end end 42b is set to be greater than 0 mm (S1>0), and preferably set to be greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

[0040] The end 42b of the first slit 42 is located lower in the height direction than the apex 43b of the second slit 43 (i.e., closer to the box body 2). If the distance S2 between the end 42b of the first slit 42 and the apex 43b of the second slit 43 is excessively small, when the break in the connecting portion 44 progresses upward, it may be difficult for the second slit 43 of the first breaking portion 41 on the rear side in the breaking direction Db to absorb the break. If the distance S2 is excessively large, in other words, if the overall length of the second slit 43 is increased to increase the distance S2, the apex 43b will protrude beyond the first slit 42, and burrs 55 (see FIGS. 7A to 7C), which are broken fragments that may result from the break, may reduce the feel of the broken edge. Therefore, the distance S2 between the end 42b and the top 43b is set to be greater than 0 mm (S2>0), and preferably set to be 0.5 mm or more and 3.0 mm or less.

[0041] As described above, in the height direction, the terminal end 42b of the first slit 42 is located above the starting end 42a of the first slit 42 with a distance S1 therebetween, and is located below the apex 43b of the second slit 43 with a distance S2 therebetween. In other words, the terminal end 42b of the first slit 42 is located between the starting end 42a of the first slit 42 and the apex 43b of the second slit 43 with respect to the first breaking portion 41 located on the rear side in the breaking direction Db. In this embodiment, the terminal end 42b of the first slit 42 is located at the same height as the base end 43a of the second slit 43. This allows the first slit 42 of the first breaking portion 41, which is located on the rear side in the breaking direction Db, to absorb the breakage when the connecting portion 44 breaks downward. Furthermore, when the fracture of the connecting portion 44 progresses upward, the fracture can be received by the second slit 43 of the rear first fracture portion 41 in the fracture direction Db.

[0042] If the length L1 in the breaking direction Db from the start 42a to the end 42b of the first cut 42 is made too short, the radius of curvature of the first cut 42 becomes small, which may reduce the feel of the broken edge. If the length L1 is made too long, the rigidity of the outer wall 10 may be excessively reduced. For this reason, the length L1 of the first cut 42 is set to be greater than 0 mm (L1>0), and is preferably set to be greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

[0043] If the radius of curvature R of the first cut 42 is made too small, the feel of the broken edge may be reduced, although this depends on the length L1 of the first cut 42. If the radius of curvature R is made too large, the overall length of the second cut 43 becomes too short, which may make it difficult for the second cut 43 to absorb the breakage. For this reason, the radius of curvature R of the first cut 42 is set to be larger than half the length L1 of the first cut 42 (R>L1 / 2), and preferably set to be equal to or larger than half the length L1 plus 0.5 mm (R≧X / 2+0.5).

[0044] On the other hand, if the length L2 of the connecting portion 44 in the breaking direction Db, i.e., the dimension between the end 42b of the first break 42 on the front side in the breaking direction Db and the start 42a of the first break 42 on the rear side in the breaking direction Db, of adjacent first breaks 42, is made too short, the connecting portion 44 may easily break when an external force is applied to the packaging box 1. On the other hand, if the length L2 is made too long, it may be difficult for the first break 42 or the second break 43 of the rear first break portion 41 in the breaking direction Db to absorb the break. For this reason, the length L2 of the connecting portion 44 is set to be equal to or greater than 1 mm and equal to or less than 5 mm.

[0045] The apex 43b of the second slit 43 is located lower in the height direction than the apex 42c of the first slit 42 (i.e., closer to the box body 2). If the apex 43b of the second slit 43 is located higher than the apex 42c of the first slit 42, burrs 55 (see FIGS. 7A to 7C) that may be generated by the breakage may reduce the feel of the broken edge. Furthermore, if the distance S3 between the apex 43b of the second slit 43 and the apex 42c of the first slit 42 is made too small, the burrs 55 that may be generated by the breakage may also reduce the feel of the broken edge. If the distance S3 is made too large, it may be difficult for the second slit 43 to absorb the breakage of the rear first breaking portion 41 in the breaking direction Db. Therefore, the distance S3 between the apex 43b of the second cut 43 and the apex 42c of the first cut 42 is set to be larger than 0 mm (S3>0), and preferably set to be 0.5 mm or more and 2.0 mm or less.

[0046] The base end 43a of the second slit 43, where the second slit 43 intersects with the first slit 42, is located closer to the apex 42c than the start end 42a of the first slit 42. When the base end 43a of the second slit 43 is spaced apart from the first slit 42, the point where an extension of the second slit 43 intersects with the first slit 42 is located closer to the apex 42c than the start end 42a of the first slit 42. If the length L3 in the breaking direction Db from the start end 42a of the first slit 42 to the base end 43a of the second slit 43 is excessively short, the length of the portion of the first slit 42 closer to the start end 42a than the base end 43a becomes shorter, which may make it difficult for the first slit 42 to absorb breakage. If length L3 is made excessively long, the overall length of second slit 43 will be shortened, although this will depend on the radius of curvature R of first slit 42, which may make it difficult for second slit 43 to absorb breakage. For this reason, length L3 from starting end 42a of first slit 42 to base end 43a of second slit 43 is set to be greater than 0 mm (L3>0), and is preferably set to be greater than or equal to 0.5 mm and less than or equal to 3.0 mm.

[0047] The second slits 43 are inclined toward the starting ends 42a of the first slits 42 from an angle perpendicular to the breaking direction Db. If the inclination angle θ of the second slits 43 with respect to the breaking direction Db is made too small, it may be difficult for the second slits 43 to absorb the breakage. If the inclination angle θ is made too large, it may also be difficult for the second slits 43 to absorb the breakage. Therefore, the inclination angle θ of the second slits 43 with respect to the breaking direction Db is set to be equal to or greater than 0 degrees and equal to or less than 90 degrees, and preferably equal to or greater than 30 degrees and equal to or less than 60 degrees.

[0048] If the total length of the second slit 43, that is, the length from the point where the second slit 43 and the first slit 42 intersect (in this embodiment, the base end 43a) to the apex 43b, is excessively short, it may be difficult for the second slit 43 to absorb the breakage of the rear first breaking portion 41 in the breaking direction Db. If the total length of the second slit 43 is excessively long, the apex 43b will protrude beyond the first slit 42, and burrs 55 (see FIGS. 7A to 7C) that may be generated by the breakage may reduce the feel of the broken edge. For this reason, the total length of the second slit 43 is set to be 1 mm or more and 3 mm or less.

[0049] Next, the configuration of the second break portion 46 provided on the second break line 45 will be specifically described.

[0050] 1, 2, and 4, the second breaking portions 46 are provided above (i.e., toward the separation portion 3) the first breaking portions 41 at intervals. Each second breaking portion 46 has a first cut (third cut) 47 and a second cut (fourth cut) 48 formed by a cutting line. The first cut 47 and the second cut 48 are formed based on the breaking direction Db.

[0051] The first cut 47 is a straight line extending along the breaking direction Db. The first cut 47 may be inclined or curved relative to the breaking direction Db as long as it does not interfere with breaking.

[0052] The second slit 48 is provided so as to connect to the end of the first slit 47 on the near side in the breaking direction Db. The second slit 48 is linear and inclined downward (i.e., toward the first breaking portion 41) as it approaches the near side in the breaking direction Db. The second slit 48 may be curved as long as it does not interfere with breaking.

[0053] The length of the second break portion 46 in the breaking direction Db, i.e., the length from the front end of the second slit 48 in the breaking direction Db to the rear end of the first slit 47 in the breaking direction Db, is set to be equal to the length L1 of the first slit 42 of the first break line 40. The length of the connecting portion 49 between adjacent second break portions 46 in the breaking direction Db is set to be equal to the length L2 of the connecting portion 44 of the first break line 40.

[0054] Next, breaking of the outer peripheral wall 10 by operating the band-shaped portion 50 will be described.

[0055] When breaking the outer peripheral wall 10, the starting end 50a of the band-shaped portion 50 formed on the rear wall portion 12 is pinched and pulled along the breaking direction Db. As a result, of the outer peripheral wall 10 shown in FIGS. 1 and 2, the rear wall portion 12 is broken vertically, and then the left side wall portion 13 is broken vertically. After that, the front wall portion 11 is broken vertically, and then the right side wall portion 13 is broken vertically. Then, when breaking is completed up to the terminal end portion 50b, the packaging box 1 is separated into the box main body 2 and the separation portion 3, as shown in FIG. 6.

[0056] 7A , when the operating direction Do of the band-shaped portion 50 is substantially aligned with the predetermined breaking direction Db, the breaking of the connecting portions 44, 49 proceeds substantially along the breaking direction Db. As a result, the breaking of the first breaking portion 41 is received near the base end 43a of the first slit 42 or the second slit 43 of the first breaking portion 41 on the rear side in the breaking direction Db. On the other hand, the breaking of the second breaking portion 46 is received by the second slit 48 of the second breaking portion 46 on the rear side in the breaking direction Db.

[0057] 7B , when the operation direction Do of the band-shaped portion 50 is biased upward relative to the defined breaking direction Db, i.e., away from the box main body 2, the breakage of the connecting portions 44, 49 proceeds upward and away from the box main body 2. As a result, the breakage of the first breaking portion 41 is received by the second slit 43 of the first breaking portion 41 on the rear side in the breaking direction Db. On the other hand, the breakage of the second breaking portion 46 is received by the second slit 48 of the second breaking portion 46 on the rear side in the breaking direction Db.

[0058] 7C , when the operation direction Do of the band-shaped portion 50 is biased downward relative to the defined breaking direction Db, i.e., toward the box main body 2, the breaking of the connecting portions 44, 49 proceeds downward so as to approach the box main body 2. As a result, the breaking of the first breaking portion 41 is received by the portion of the first breaking portion 41 on the rear side in the breaking direction Db that is closer to the first slit 42 than the second slit 43. On the other hand, the breaking of the second breaking portion 46 is received by the second slit 48 of the second breaking portion 46 on the rear side in the breaking direction Db.

[0059] As described above, in this embodiment, even if the operating direction Do of the band-shaped portion 50 is biased, the outer peripheral wall 10 can be reliably broken along the first break line 40 and the second break line 45, as shown in Fig. 6. The broken edge of the box body 2 caused by the first break line 40 becomes wavy with multiple continuous arcs due to the first cuts 42. Therefore, the broken edge does not cause pain when touched by the hand, and the feel of the broken edge of the packaging box 1 formed by breaking can be improved.

[0060] The first breaking portion 41 has a second slit 43 extending toward the separating portion 3 between the starting end 42a and the apex 42c of the first slit 42 that protrudes furthest from the box body 2. The end 42b of the first slit 42 is located closer to the box body 2 than the apex 43b of the second slit 43. The second slit 43 is inclined toward the starting end 42a from an angle perpendicular to the breaking direction Db. This allows the second slit 43 to absorb the break when the connecting portion 44 between adjacent first breaking portions 41 breaks, even if the break progresses in a direction away from the box body 2. The point where the second slit 43 and the first slit 42 intersect is located closer to the apex 42c than the starting end 42a. As a result, when the connecting portion 44 between adjacent first breaking portions 41 is broken, even if the breaking progresses in a direction toward the box body 2, the breaking can be received by the portion of the first slit 42 that is closer to the starting end 42a than the second slit 43. Therefore, the breaking can be prevented from progressing in an unintended direction, and the outer peripheral wall 10 can be broken at a predetermined breaking position.

[0061] The apex 43b of the second slit 43 is located closer to the box body 2 than the apex 42c of the first slit 42. This prevents burrs 55, which may be generated by breaking the connecting portion 44 between adjacent first breaking portions 41, from being located between the apexes 42c of the adjacent first slits 42 and protruding beyond the apexes 42c. This prevents the burrs 55 from coming into contact with the hands, thereby reliably improving the feel of the broken edge.

[0062] The starting end 42a of the first slit 42 is located closer to the box body 2 than the ending end 42b. This allows the breakage to be reliably absorbed by the portion of the first slit 42 that is closer to the starting end 42a than the second slit 43 when the breakage progresses in a direction toward the box body 2.

[0063] The end 42b of the first slit 42 is located between the starting end 42a of the first slit 42 and the top end 43b of the second slit 43. This allows the separation part 3 to reliably absorb the break when the break progresses in a direction away from the box body 2. On the other hand, when the break progresses in a direction approaching the box body 2, the break can be reliably absorbed by the part of the first slit 42 that is closer to the starting end 42a than the second slit 43.

[0064] The second breaking portions 46, which are provided at a distance from the first breaking portions 41 toward the separation portion 3, include a linear first slit 47 extending along the breaking direction Db and a linear second slit 48 that is inclined toward the first breaking portion 41 as it approaches the front side of the breaking direction Db. This allows the outer peripheral wall 10 to be broken into the box main body 2 and the separation portion 3 by pulling the band-shaped portion 50 formed between the plurality of first breaking portions 41 and the plurality of second breaking portions 46.

[0065] The multiple first breaking portions 41 and multiple second breaking portions 46 are provided to surround the outer peripheral wall 10 of the packaging box 1, and can break the packaging box 1 into the box main body 2 and the separation portion 3. As a result, for example, when the box main body 2 is placed on a display stand with articles stored therein, the broken edge of the box main body 2 becomes a continuous wavy shape with multiple arcs caused by the first cuts 42, improving the feel of the tactile sensation. On the other hand, the broken edge of the separation portion 3 to be discarded becomes sawtooth-shaped due to the linear first cuts 47 and second cuts 48, respectively, so an improved feel of the tactile sensation cannot be expected, but the workability when breaking the outer peripheral wall 10 can be improved.

[0066] Other embodiments and various modifications of the present invention will be described below, but in these descriptions, points that are not particularly mentioned are the same as those in the first embodiment. In the drawings referred to below, the same elements as those in the first embodiment are given the same reference numerals.

[0067] 8 to 10 show a packaging box 1 to which the break line structure of the second embodiment is applied, and Figs. 11 to 13 show a packaging box 1 to which the break line structure of the third embodiment is applied. As with the first embodiment, these packaging boxes 1 include an outer peripheral wall 10, a bottom wall 20, and a cover wall 30. As with the first embodiment, the break line structure includes a first break line 40 and a second break line 45, but differs from the first embodiment in that portions of the first break line 40 and the second break line 45 are inclined along a break direction Db that is determined so that a portion of the first break line 40 and the second break line 45 is inclined.

[0068] (Second embodiment) 8 to 10, the band-shaped portion 50 of the second embodiment includes a pair of starting ends 50a for initiating the tearing operation and a pair of ending ends 50b for completing the tearing operation. The pair of starting ends 50a are provided in the center of the left sidewall 13 in the front-rear direction. More specifically, the pair of starting ends 50a are defined by a pair of first cutting lines 50c located on extensions of the first breaking line 40, a pair of second cutting lines 50d located on extensions of the second breaking line 45, a third cutting line 50e located between the first cutting line 50c and the second cutting line 50d, and a fold line 50f. The pair of ending ends 50b are provided in the center of the right sidewall 13 in the front-rear direction and are defined by a cutting line 50g.

[0069] When the left side wall 13, on which the pair of starting ends 50a are formed, is viewed head-on, the first breaking direction Db1 slopes upward as it moves away from the center toward the outside. When the front wall 11 and the rear wall 12 are viewed head-on, the second breaking direction Db2 slopes upward from the left side wall 13 toward the right side wall 13. When the right side wall 13, on which the pair of ending ends 50b are formed, is viewed head-on, the third breaking direction Db3 extends horizontally. The inclination angle of the breaking direction Db2 with respect to the bottom wall 20 is set in the range of 10 degrees to 30 degrees.

[0070] (Third embodiment) 11 to 13, the band-shaped portion 50 of the third embodiment has a pair of starting ends 50a and a pair of ending ends 50b, similar to the second embodiment. The pair of starting ends 50a are provided in the center of the right sidewall 13 in the front-to-rear direction and are defined by a pair of first cutting lines 50c, a pair of second cutting lines 50d, a third cutting line 50e, and a fold line 50f. The pair of ending ends 50b are provided in the center of the left sidewall 13 in the front-to-rear direction and are defined by a cutting line 50g.

[0071] When the right side wall 13, on which the pair of starting ends 50a are formed, is viewed head-on, the first breaking direction Db1 slopes downward as it moves away from the center toward the outside. When the front wall 11 and the rear wall 12 are viewed head-on, the second breaking direction Db2 slopes downward from the right side wall 13 toward the left side wall 13. When the left side wall 13, on which the pair of ending ends 50b are formed, is viewed head-on, the third breaking direction Db3 extends horizontally. The inclination angle of the breaking direction Db2 with respect to the bottom wall 20 is set in the range of 10 degrees to 30 degrees.

[0072] In the second and third embodiments in which the fracture directions Db1 to Db3 are determined as described above, the first fracture portions 41 of the first fracture line 40 and the second fracture portions 46 of the second fracture line 45 are spaced apart along the fracture directions Db1 to Db3. A connecting portion 44 is formed between adjacent first fracture portions 41, and a connecting portion 49 is formed between adjacent second fracture portions 46.

[0073] The start end 42a, end end 42b, and apex 42c of each first slit 42 of each first fracture portion 41, and the base end 43a and apex 43b of each second slit 43 are formed in the same manner as in the first embodiment, with respect to the fracture directions Db1 to Db3. The first slits 47 and second slits 48 of each second fracture portion 46 are formed in the same manner as in the first embodiment, with respect to the fracture directions Db1 to Db3.

[0074] In the packaging box 1 of the second embodiment and the packaging box 1 of the third embodiment configured as described above, the pair of starting ends 50a of the band-shaped portion 50 are each pinched and pulled along the breaking direction Db. As a result, one of the pair of side wall portions 13 of the outer peripheral wall 10 is broken vertically, and then the front wall portion 11 and the rear wall portion 12 are broken vertically. Next, the other of the pair of side wall portions 13 is broken vertically. When breaking is completed up to the end portion 50b, the packaging box 1 is separated into the box main body 2 and the separation portion 3.

[0075] When the outer peripheral wall 10 is broken by the band-shaped portion 50, even if the actual operation direction is biased, the outer peripheral wall 10 can be reliably broken along the first break line 40 and the second break line 45, as in the first embodiment. Furthermore, the broken edge of the box body 2 caused by the first break line 40 becomes wavy with multiple continuous arcs due to the first cuts 42. Therefore, even if the broken edge is touched by the hand, it does not cause pain, and the feel of the broken edge can be improved.

[0076] The present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

[0077] For example, apex 43b of second cut 43 in first breaking portion 41 may protrude beyond apex 42c of first cut 42, as long as the feel of the broken edge is not impaired. Starting end 42a of first cut 42 in first breaking portion 41 may be positioned at the same height as ending end 42b, or may be positioned higher than ending end 42b, as long as it is possible to accommodate the break.

[0078] The first break line 40 and the second break line 45 are not limited to being provided so as to surround the outer peripheral wall 10, but may be provided so as to break a portion of the outer peripheral wall 10. For example, the first break line 40 and the second break line 45 may be provided so as to form a quadrangle in one of the wall portions 11 to 13 that constitute the outer peripheral wall 10, and a window may be formed by the break. Alternatively, the window may be formed only by the first break line 40. In other words, the packaging box 1 may use only the first break line 40, without using the second break line 45.

[0079] The packaging box 1 using the first break line 40 may be configured such that at least one of the upper and lower openings of the outer peripheral wall 10 is closed by a separate member. The bottom wall may be configured with a pair of inner flaps connected to the pair of side wall portions 13, respectively, and a pair of outer flaps connected to the front wall portion 11 and the rear wall portion 12, respectively, and may be configured with general-purpose flaps that do not interlock and close the lower opening even when the outer peripheral wall 10 is opened cylindrically. The lid wall may be configured with a pair of general-purpose inner flaps connected to the pair of side wall portions 13, respectively, and a pair of general-purpose outer flaps connected to the front wall portion 11 and the rear wall portion 12, respectively. In other words, the format of the packaging box 1 can be changed as needed. [Explanation of symbols]

[0080] 1 packaging box 2 Box body (first part) 3 Separation part (second part) 10 Outer wall (wall to be broken) 11 Front wall 12 Rear wall 13 Side wall 14 Side wall main body 15 Substitute section 16 Bend section 16a folding line 20 Bottom Wall 21 First flap 21a folding line 21b Adhesive part 22 Second flap 23 Bend section 23a folding line 24 Bend section 24a folding line 30 Lid wall 31 Bend section 31a folding line 32 Insert 33 Bend part 33a folding line 34 Inner flap 35 Bend section 35a folding line 40 First Break Line 41 First break 42 First cut 42a Beginning 42b termination 42c top 43 Second cut 43a proximal end 43b Apex 44 Joint 45 Second break line 46 Second break 47 1st cut (3rd cut) 48 2nd cut (4th cut) 49 Joint 50 Belt 50a Starting end 50b Termination 50c 1st cutting line 50d 2nd cutting line 50e 3rd cutting line 50f folding line 50g cutting line 55 Bali S1 Distance between the start and end of the first break S2: Distance between the end of the first cut and the top of the second cut S3 Distance between the top of the second cut and the top of the first cut L1 Length of the first cut L2 Length of the joint L3: The length from the beginning of the first slit to the base of the second slit θ Inclination angle of the second cut Db Determined fracture direction Do operation direction

Claims

1. a plurality of first breaking portions provided at intervals along a breaking direction of the breakable wall of the packaging box in order to break the breakable wall into a first portion and a second portion; Each of the first breakage portions is a first cut having an arc-shaped portion protruding toward the second portion and having a start end located on the front side of the breaking direction and a finish end located on the rear side of the breaking direction; a second slit provided between the top of the first slit that protrudes most from the first portion and the starting end and extending toward the second portion; Equipped with the end of the first cut is located closer to the first portion than the apex of the second cut that is farthest from the first cut, The second cut is inclined toward the starting end side from an angle position perpendicular to the breaking direction, A breaking line structure of a packaging box, wherein the point where the second cut or an extension of the second cut intersects with the first cut is located closer to the top than the starting end.

2. The break line structure of a packaging box according to claim 1 , wherein the top end of the second cut is located closer to the first portion than the top end of the first cut.

3. The breaking line structure of the packaging box according to claim 1 or 2, wherein the start end of the first cut is located closer to the first portion than the end end.

4. 3. The break line structure of a packaging box according to claim 1, wherein the end of the first cut is located between the start of the first cut of the first break portion located on the rear side of the breaking direction and the top end of the second cut.

5. a plurality of second breaking portions provided at intervals on the second portion side relative to the plurality of first breaking portions; Each of the second breakage portions is a linear third cut extending along the breaking direction; a fourth slit that is provided at the front end of the third slit in the breaking direction and is linear and inclined toward the first breaking portion as it moves toward the front end in the breaking direction; The breaking line structure of the packaging box according to claim 1 or 2, comprising:

6. The packaging box has a cylindrical outer wall that is the breakable wall, 6. The packaging box according to claim 5, wherein the plurality of first breaking portions and the plurality of second breaking portions are arranged to surround the outer wall, and the packaging box can be broken into the first portion, which is the box body, and the second portion, which is the separation portion.

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