Packing box

Abstract

To improve the openability of a packaging box by the operation of an opening operation portion.SOLUTION: A packaging box 1 of the invention includes: a top plate 11 extending in the first direction X and the second direction Y; a bottom plate 12 spaced apart from the top plate 11 in the third direction Z; side plates 13A and 13B connected to the ends of the top plate 11 and bottom plate 12 in the first direction X; inner flaps 21 connected to the ends of the side plates 13A and 13B in the second direction Y; outer flaps 22 connected to the ends of the top plate 11 and the bottom plate 12 in the second direction Y; an opening operation portion 30 provided on the outer flap 22 connected to the top plate 11; a first breaking line 36 provided on the inner flap 21; a second breaking line 37 provided on the side plates 13A and 13B; a third breaking line 38 provided in the side plates 13A and 13B extending from the second breaking line 37 toward the top plate 11; and a folding line portion 39 provided on the top plate 11 so as to be positioned between the pair of third breaking lines 38.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] Patent Document 1 discloses a wrap-around type packaging box having a first break line and a pair of second break lines provided on each of a pair of side panels, a third break line provided on each of four inner flaps, and a fold line provided on the top panel. The first break line extends from the center of the side panels in the longitudinal direction toward the top panel, and the pair of second break lines extend from the lower end of the first break line to the outside in the longitudinal direction of the side panels. The third break line is provided at a position adjacent to the second break line and extends in the width direction of the inner flaps. The fold line is provided on the top panel, and both ends of the fold line are adjacent to the upper ends of the first break lines of the pair of side panels. In addition, the side panels are provided with opening operation parts at the longitudinal center portions of the pair of second break lines.

[0003] When opening the packaging box, insert your hands into each of the two opening operation sections located on one side in the length direction and operate it to lift up toward the top plate. This breaks the side plate along the second break line, then breaks the side plate along the first break line, and breaks the inner flap along the third break line. Also, by folding the top plate along the fold line, one side in the length direction of the packaging box can be opened. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6736592 Summary of the Invention [Problem to be solved by the invention]

[0005] In the packaging box of Patent Document 1, when the article contained therein is light, even if the two opening operation parts located on one side in the length direction are operated as described above, the entire packaging box is simply lifted, and the side panels and inner flaps cannot be broken along the breaking lines. Therefore, there is room for improvement in the ease of opening the packaging box by operating the opening operation parts.

[0006] An object of the present invention is to improve the ease of opening a packaging box by operating an opening operation section. [Means for solving the problem]

[0007] The present invention includes a top plate extending in a first direction and a second direction intersecting with the first direction, a bottom plate provided with a gap in a third direction intersecting with both the first direction and the second direction relative to the top plate, a pair of side plates connected to the ends of the top plate and the bottom plate in the first direction and extending in the second direction and the third direction, inner flaps connected to the ends of the pair of side plates in the second direction, outer flaps connected to the ends of the top plate and the bottom plate in the second direction and disposed outside the inner flaps, and a pair of side plates connected to the top plate. the pair of side panels are provided adjacent to the first break lines and extend in the second direction; a third break line is provided in a central region of each of the pair of side panels in the second direction and extends from the second break line toward the top panel in the third direction; and a fold line portion provided on the top panel, the first break line being adjacent to an upper end of one of the pair of third break lines and a second break line being adjacent to an upper end of the other of the pair of third break lines. The fold line portion has a first fold line having the first end and a second fold line having the second end and spaced apart from the first fold line in the first direction, and a pressing portion defined by an endless break line is provided between the first fold line and the second fold line on the top plate. and provide packaging boxes.

[0008] Since the opening operation part is provided on the outer flap connected to the top plate, when the opening operation part is operated with one hand, the area of ​​the top plate opposite to the opening operation part to be operated can be held with the other hand. Therefore, even if the article contained inside is light, the packaging box is not lifted by the operation of the opening operation part, and the inner flap can be broken along the first breaking line. After the inner flap is broken, the side plate can be broken along the second breaking line, and then the side plate can be broken along the third breaking line. After the side plate is broken, the top plate can be folded along the fold line to create a semi-opened state. After that, the opened side can be returned to its original position and the opposite side can be operated in the same way to open the packaging box. In this way, the inner flap and the side plate can be easily broken regardless of the weight of the article contained inside, so that the ease of opening the packaging box by operating the opening operation part can be improved. Effect of the Invention

[0009] According to the present invention, the ease of opening the packaging box by operating the opening operation section can be improved. [Brief description of the drawings]

[0010] [Figure 1] 1 is a perspective view of a packaging box according to a first embodiment of the present invention. [Diagram 2] A plan view of the blank showing all fold lines. [Diagram 3] FIG. 2 is a plan view of the packaging box of FIG. 1; [Figure 4] FIG. 2 is a bottom view of the packaging box of FIG. 1. [Diagram 5] FIG. 2 is a front view of the packaging box of FIG. 1. [Figure 6] FIG. 2 is a rear view of the packaging box of FIG. 1. [Figure 7] FIG. 2 is a left side view of the packaging box of FIG. 1. [Figure 8] Cross-sectional view taken along line AA in Figure 5. [Figure 9] 2 is a perspective view showing a process of opening the packaging box of FIG. 1. [Figure 10] FIG. 4 is a perspective view showing the lower part of the opened packaging box. [Figure 11] FIG. 4 is a perspective view showing the upper part of the opened packaging box. [Figure 12] FIG. [Figure 13] FIG. 11 is a perspective view of a packaging box according to a second embodiment. [Figure 14] A plan view of the blank showing all fold lines. [Figure 15] FIG. 14 is a plan view of the packaging box of FIG. [Figure 16] 14 is a bottom view of the packaging box of FIG. 13 . [Figure 17] FIG. 14 is a front view of the packaging box of FIG. 13 . [Figure 18] FIG. 14 is a rear view of the packaging box of FIG. 13 . [Figure 19] FIG. 14 is a left side view of the packaging box of FIG. 13 . [Figure 20] Cross-sectional view of line BB in Figure 17. [Figure 21] 14 is a perspective view showing a process of opening the packaging box of FIG. 13. [Figure 22] FIG. 4 is a perspective view showing the lower part of the opened packaging box. [Figure 23] FIG. 4 is a perspective view showing the upper part of the opened packaging box. [Figure 24] FIG. [Diagram 25] FIG. 11 is a perspective view of a packaging box according to a third embodiment. [Figure 26] A plan view of the blank showing all fold lines. [Figure 27] FIG. 26 is a plan view of the packaging box of FIG. 25 . [Figure 28] 26 is a bottom view of the packaging box of FIG. 25 . [Figure 29] FIG. 26 is a front view of the packaging box of FIG. 25 . [Diagram 30] 26 is a rear view of the packaging box of FIG. 25 . [Diagram 31] FIG. 26 is a left side view of the packaging box of FIG. 25 . [Diagram 32] Cross-sectional view of line CC in Figure 29. [Diagram 33] 26 is a perspective view showing a process of opening the packaging box in FIG. 25. [Diagram 34] FIG. 4 is a perspective view showing the lower part of the opened packaging box. [Diagram 35] FIG. 4 is a perspective view showing the upper part of the opened packaging box. [Diagram 36]FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0012] (First embodiment) 1 shows a packaging box 1 according to a first embodiment of the present invention. This packaging box 1 is a wraparound case including a rectangular cylindrical outer wall 10 and a pair of lids 20 that close both end openings of the outer wall 10. The packaging box 1 of this embodiment can be opened in a separated state into a lower portion 2 (see FIG. 10) and an upper portion 3 (see FIG. 11) by breaking the outer wall 10 and the lid 20 along three types of breaking lines 36 to 38.

[0013] In the drawings referred to in the following description, the X direction is the width direction of the packaging box 1, the Y direction is the length direction of the packaging box 1, and the Z direction is the height direction of the packaging box 1. The width direction X is the first direction in the present invention, the length direction Y is the second direction in the present invention, and the height direction Z is the third direction in the present invention.

[0014] 1, the packaging box 1 is a rectangular parallelepiped whose length direction Y is longer than its width direction X, and whose width direction X is longer than its height direction Z. However, the width direction X, length direction Y, and height direction Z dimensions of the packaging box 1 are changed depending on the items to be stored therein.

[0015] Specifically, the dimension in the length direction Y is set to 250 mm or more, the dimension in the height direction Z is set to 200 mm or less, and the dimension in the width direction X is set to be equal to or greater than the dimension in the height direction Z. In other words, taking the dimension in the length direction Y as a reference, the dimension in the height direction Z is set to be 80% or less of the dimension in the length direction Y, and the dimension in the width direction X is set to be 80% or more of the dimension in the length direction Y.

[0016] More specifically, in the packaging box 1 of this embodiment, the dimension in the length direction Y is set to 487 mm, the dimension in the width direction X is set to 387 mm, and the dimension in the height direction Z is set to 110 mm. In this way, when the packaging box 1, which is a rectangular parallelepiped with a low height and long and narrow sides, is separated into the lower part 2 and the upper part 3, it is difficult to break the long side along the break lines 37, 38, and the break may progress (derail) in a direction different from the extension direction of the break lines 37, 38. In addition, lightweight items are often stored inside, and in this case, the entire packaging box 1 is lifted by the opening operation, making it difficult to open. In this embodiment, it is intended to improve the openability of such a packaging box 1.

[0017] The configuration of the packaging box 1 will now be described in detail.

[0018] (Overview of the packaging box) The packaging box 1 shown in Fig. 1 is formed by folding a blank shown in Fig. 2 at predetermined positions and bonding the predetermined positions. The blank is formed by punching a paper corrugated cardboard sheet with a well-known paper container punching device. The cardboard sheet is configured with a corrugated core disposed between a front liner (the outer surface of the packaging box 1) and a back liner (the inner surface of the packaging box 1).

[0019] The part shown by the dashed line in Fig. 2 is a general-purpose crease formed by scoring from the rear liner side to compress the thickness. The part shown by the dashed line in Fig. 2 is a general-purpose crease formed by scoring from the front liner side to compress the thickness. The part shown by the solid line in Fig. 2 is a cutting line formed by cutting from the rear liner to the front liner with a blade, and a shaped line (edge) formed by punching.

[0020] Fig. 3 is a plan view of the packaging box 1, Fig. 4 is a bottom view of the packaging box 1, Fig. 5 is a front view of the packaging box 1, Fig. 6 is a rear view of the packaging box 1, and Fig. 7 is a left side view of the packaging box 1. The right side view is symmetrical with the left side view of Fig. 7. Fig. 8 is a cross-sectional view taken along line AA in Fig. 5, Fig. 9 is a perspective view showing the process of opening the packaging box 1, Fig. 10 is a perspective view showing the lower part 2 of the opened packaging box 1, and Fig. 11 is a perspective view showing the upper part 3 of the opened packaging box 1. An example of an article to be stored inside (instant noodles) is shown by a two-dot chain line in Figs. 9 and 10.

[0021] Fig. 12 is a plan view showing a blank of the packaging box 1. All the creases are shown in Fig. 2, but Fig. 12 shows only the creases that actually appear in a plan view. Specifically, the general creases are provided on the back liner side, so they do not appear in Fig. 12. The reverse creases are provided on the front liner side, so they appear as thin lines in Fig. 12. The cutting lines run from the back liner to the front liner, so they appear as thick lines in Fig. 12. Figs. 5 to 7 show creases that do not actually appear, in the same way as Fig. 2.

[0022] 1, the outer peripheral wall 10 includes a top plate 11 and a bottom plate 12 spaced apart in the height direction Z, and side plates 13A and 13B spaced apart in the width direction X. Of these, the side plate 13B includes a side plate main body 14 and an attachment portion 15, which are attached (fixed) with an adhesive such as a hot melt resin.

[0023] The top plate 11 and the bottom plate 12 are formed in a generally identical rectangular shape and extend along the XY plane. The pair of side plates 13A, 13B are formed in a generally identical rectangular shape and extend along the YZ plane. The side plates 13A, 13B are each continuous with both ends of the top plate 11 in the width direction X via a bent portion 16 extending in the length direction Y. The side plates 13A, 13B are each continuous with both ends of the bottom plate 12 in the width direction X via a bent portion 17 extending in the length direction Y.

[0024] 2, the side panel body 14, the top panel 11, the side panel 13A, the bottom panel 12, and the attachment portion 15 are connected in this order from top to bottom. The side panel body 14 and the side panel 13A are connected to the top and bottom of the top panel 11 via fold lines 16a constituting the folding portion 16. The side panel 13A and the attachment portion 15 are connected to the top and bottom of the bottom panel 12 via fold lines 17a constituting the folding portion 17. The fold lines 16a are general-purpose creases, and the fold lines 17a are lead creases. The lead creases are configured by providing multiple cut lines at intervals on the general-purpose creases in order to improve the folding ability more than the general-purpose creases. Since the attachment portion 15 has a short protruding dimension and is located at the end of the blank, the number of cutting lines of the lead crease (fold line 17a) between the bottom plate 12 and the attachment portion 15 is greater than the number of cutting lines of the lead crease (fold line 17a) between the bottom plate 12 and the side plate 15A.

[0025] After bending the side panel body 14 relative to the top panel 11, the bottom panel 12 is bent relative to the side panel 13A, and the attachment portion 15 is attached to the outer surface of the side panel body 14 (outer glue). As a result, the side panel body 14 and the attachment portion 15 are integrated as the side panel 13B, and a continuous, endless outer peripheral wall 10 is formed.

[0026] The attachment portion 15 may be connected to the top plate 11, and the side plate body 14 may be connected to the bottom plate 12. As shown by the dashed line in Fig. 2, the attachment portion 15 may be connected to the side plate 13B and attached to the bottom plate body, or may be connected to the side plate 13A and attached to the top plate body. The attachment portion 15 is not limited to a configuration in which it is attached to the outer surface side of the attachment target (outer gluer), but may be attached to the inner surface side of the attachment target (inner gluer).

[0027] 1, the pair of lid portions 20 are spaced apart in the length direction Y and extend along the XZ plane. Each lid portion 20 is rectangular and connected to the top plate 11, the bottom plate 12, and the pair of side plates 13A, 13B. Specifically, the lid portion 20 includes a pair of inner flaps 21 spaced apart in the width direction X, and a pair of outer flaps 22 spaced apart in the height direction Z. The pair of outer flaps 22 are disposed on the outer surfaces of the pair of inner flaps 21, and the overlapping portions of these are attached to each other with an adhesive such as a hot melt resin, similar to the side plate 13B, to form the lid portion 20.

[0028] The pair of inner flaps 21 are rectangular in shape with dimensions such that their tips are positioned in a straight line with the tips of the outer flaps 22 in the blank state shown in Fig. 2. The pair of outer flaps 22 are rectangular in shape with dimensions such that their tips abut each other in the sealed state shown in Fig. 1. Referring to Fig. 1, the total of four (two pairs) inner flaps 21 are connected to the ends of the length direction Y of each of the side panels 13A and 13B via bent portions 23 extending in the height direction Z. The total of four (two pairs) outer flaps 22 are connected to the ends of the length direction Y of each of the top panel 11 and bottom panel 12 via bent portions 24 extending in the width direction X.

[0029] 2, of the four inner flaps 21, two are connected to both sides of the side panel 13A via fold lines 23a that form the fold portion 23, and the remaining two are connected to both sides of the side panel main body 14 via fold lines 23a. Of the four outer flaps 22, two are connected to both sides of the top panel 11 via fold lines 24a that form the fold portion 24, and the remaining two are connected to both sides of the bottom panel 12 via fold lines 24a. The fold lines 23a, 24a are all general-purpose lines and are arranged in a generally straight line.

[0030] (Break line structure for opening) 1 and 2, in order to open the packaging box 1 like a tray, each of the outer flaps 22 connected to the top plate 11 is provided with one opening operation section (hereinafter, abbreviated as "operation section") 30. Each of the inner flaps 21 is provided with a first break line 36, and each of the side plates 13A, 13B is provided with a pair of second break lines 37 and one third break line 38. Furthermore, the top plate 11 is provided with one fold line section 39. These allow the packaging box 1 to be opened in two operations.

[0031] 2, 7 and 8, the operating part 30 is a starting point of the opening operation, and is provided for breaking the inner flap 21 along the first breaking line 36 and breaking the side panels 13A and 13B along breaking lines 37 and 38 by operating toward the top panel 11. The operating parts 30 in this embodiment are provided at the center of the outer flaps 22 in the width direction.

[0032] The operating portion 30 is provided at the tip portion of the outer flap 22 that is the furthest from the top plate 11. The operating portion 30 is a cut and raised structure defined by a pair of outer cutting lines 31 and a fold line 33. In this embodiment, a central cutting line 32 is further provided between the pair of outer cutting lines 31, and two fold lines 33 are provided.

[0033] The pair of outer cutting lines 31 are spaced apart in the width direction X, and each extends in the height direction Z from the tip of the outer flap 22 toward the top plate 11. The space between the pair of outer cutting lines 31 is set as small as possible within a range in which a worker's hand (three fingers) can be inserted.

[0034] The central cutting line 32 is provided between a pair of outer cutting lines 31, and extends in the height direction Z from the tip of the outer flap 22 toward the top plate 11. The total length of the central cutting line 32 in the height direction Z is longer than the total length of the outer cutting lines 31 in the height direction Z. Therefore, the upper end of the central cutting line 32 on the top plate 11 side is located closer to the top plate 11 than the upper end of the outer cutting line 31 on the top plate 11 side. The central cutting line 32 in this embodiment is composed of two cutting lines provided with a breakable gap between them. Here, the breakable gap means a distance at which the non-cut portion (continuous portion) between the cutting lines can be broken so that adjacent cutting lines are connected by applying an external force.

[0035] The fold lines 33 are general-purpose lines and are provided between the upper end of the outer cutting line 31 and the upper end of the central cutting line 32. One of the two fold lines 33 extends from the upper end of one of the pair of outer cutting lines 31 to the upper end of the central cutting line 32, and the other of the two fold lines 33 extends from the upper end of the other of the pair of outer cutting lines 31 to the upper end of the central cutting line 32. Each fold line 33 is inclined toward the top board 11 (upward) from the outside toward the center in the width direction X of the outer flap 22.

[0036] A breakage prevention portion 34 is provided at the upper end of the central cutting line 32, extending along the fold line 33. The breakage prevention portion 34 is made of a cutting line, and prevents further breakage from the upper end of the central cutting line 32 toward the top board 11 by operating the operating portion 30 surrounded by the pair of outer cutting lines 31 and the pair of fold lines 33.

[0037] The operating section 30 is not limited to the above configuration and may be modified in various ways. For example, the overall length of the central cutting line 32 may be the same as the overall length of the pair of outer cutting lines 31. Alternatively, one folding line 33 may be provided between the pair of outer cutting lines 31 without providing the central cutting line 32. Alternatively, the operating section 30 may be an opening (or a cutout) formed by punching.

[0038] 2 and 8, the inner flap 21 has a notch 35 cut outward in the width direction X at the tip portion farthest from the continuous side plates 13A, 13B. The force applied to the outer flap 22 by operating the operating part 30 is transmitted to the inner flap 21 via an adhesive part (not shown) and is concentrated at the outer end of the notch 35 in the width direction X.

[0039] 1, 2, and 8, the first break line 36 extends in the width direction X so as to be parallel to the bent portion 24. However, the first break line 36 is not limited to a configuration extending parallel to the bent portion 24, and may be inclined or curved with respect to the bent portion 24, as long as it extends along the width direction X as a whole.

[0040] The first breakage line 36 in this embodiment is a one-sided zipper having a plurality of first cut lines 36a spaced apart in the width direction X and second cut lines 36b continuing to the ends of the first cut lines 36a.

[0041] Of the multiple first cutting lines 36a, the inner ends of the first cutting lines 36a located on the tip side of the inner flap 21 are continuous with the notch 35. Of the multiple first cutting lines 36a, the outer ends of the first cutting lines 36a closest to the side plates 13A, 13B are positioned at a distance from the folding portion 23 (folding line 23a). However, in the width direction X, the inner ends of the first cutting lines 36a located at the inner ends may be provided at a breakable distance from the notch 35, and the outer ends of the first cutting lines 36a located at the outer ends may be disposed on the folding portion 23.

[0042] The second cutting line 36b is provided at a position other than the first cutting line 36a located at the inner end in the width direction X. The second cutting line 36b is connected to the inner end of the first cutting line 36a on the cutout 35 side, and is inclined toward the top board 11 as it approaches the cutout 35. This is because the operating unit 30 is operated toward the top board 11. The end of the second cutting line 36b that is not connected to the first cutting line 36a is located at a breakable distance from the adjacent first cutting line 36a.

[0043] The first break line 36 is provided between the pair of outer flaps 22, i.e., within a predetermined range R in the height direction Z based on the center (center position) of the overall height of the inner flap 21. This range R is preferably at least 15 mm from the center position toward the bottom plate 12 (lower side) and at most 15 mm from the center position toward the top plate 11 (upper side).

[0044] Since the adhesion area of ​​the inner flap 21 and the outer flap 22 is included outside the range R, if the first break line 36 is provided outside the range R, the amount of displacement that the inner flap 21 can deform is reduced, making it difficult to break the inner flap 21 along the first break line 36. On the other hand, the breakability of the inner flap 21 along the first break line 36 improves as it approaches the center position of the inner flap 21 (between the tips of the outer flaps 22). Therefore, the first break line 36 is preferably provided within the above-defined range R, and is provided at the center position in this embodiment. Also, the cutout portion 35 is provided at a position corresponding to the formation position of the first break line 36.

[0045] 1 and 2, the second break lines 37 are provided on both sides of the side plates 13A and 13B in the longitudinal direction Y so as to be adjacent to the first break line 36, and extend in the longitudinal direction Y. With reference to FIGS. 5 and 6, the second break lines 37 of this embodiment are inclined linearly from the outer sides of the side plates 13A and 13B in the longitudinal direction Y toward the third break line 38 toward the top plate 11. That is, in this specification, the second break lines 37 extending in the longitudinal direction Y are not limited to a geometrically strict configuration parallel to the bent portions 16 and 17 extending in the longitudinal direction Y, but include a configuration extending in a direction intersecting the bent portions 16 and 17. In addition, the second break lines 37 may be curved or wavy with repeated concaves and convexes, as long as they extend in the longitudinal direction Y as a whole.

[0046] 5 and 6, the second break line 37 has an outer end 37a located on the inner flap 21 side, and an inner end 37b located in the central region of the side plates 13A, 13B in the longitudinal direction Y. The central region of the side plates 13A, 13B in the longitudinal direction Y is the middle region when the side plates 13A, 13B are divided into thirds in the longitudinal direction Y.

[0047] Both the outer end 37a and the inner end 37b of the second break line 37 are located in the central region in the height direction Z of the side plates 13A, 13B. The central region in the height direction Z of the side plates 13A, 13B is the middle region when the side plates 13A, 13B are divided into thirds in the height direction Z. The second break line 37 of the side plate 13B is provided in a portion of the side plate main body 14 where the attachment portions 15 do not overlap.

[0048] The outer ends 37a of the second break lines 37 are all disposed at the same height in the height direction Z based on the formation positions of the first break lines 36. Specifically, the outer ends 37a are disposed at a breakable interval from the outer end of the first break line 36 in the width direction X. The outer ends 37a in this embodiment are disposed on the bent portion 23, but may be disposed at a distance from the bent portion 23 as long as the distance is such that the outer ends 37a can be broken relative to the first break line 36.

[0049] The inner ends 37b of the second break lines 37 extend toward the lower end of the third break lines 38, and are disposed at the same height in the height direction Z. The inner ends 37b of the pair of second break lines 37 provided on each side plate 13A, 13B are disposed at the same point in the central region. However, the inner ends 37b of the pair of second break lines 37 may be disposed at an interval from each other.

[0050] More specifically, the second break line 37 is a one-sided zipper having a plurality of first cut lines 37c spaced apart in the length direction Y and a second cut line 37d connected to the end of the first cut line 37c. The second cut line 37d is provided at a location other than the first cut line 37c located at the outer end in the length direction Y. The second cut line 37d is connected to the outer end of the first cut line 37c on the inner flap 21 side, and is inclined toward the top plate 11 as it approaches the inner flap 21. This is because the operating unit 30 is operated toward the top plate 11. The end of the second cut line 37d that is not connected to the first cut line 37c is located at a breakable interval from the adjacent first cut line 37c.

[0051] 1 and 2, the third break line 38 is provided in the central region of the side plates 13A, 13B in the length direction Y, and extends in the height direction Z from the intersection of the pair of second break lines 37 toward the top plate 11. With reference to Figs. 5 and 6, the third break line 38 is provided in the center of the side plates 13A, 13B in the length direction Y, and extends parallel to the bent portion 23 (height direction Z). However, the third break line 38 may be inclined with respect to the bent portion 23.

[0052] More specifically, the third break line 38 is made up of a plurality of (two in this embodiment) cut lines provided at intervals in the height direction Z to allow the third break line 38 to be broken. The lower end of the cut line closest to the second break line 37 is positioned at an interval from the second break line 37. The upper end of the cut line closest to the top board 11 is positioned at an interval from the bent portion 16. However, the lower end of the second break line 37 may be located on the inner end 37b of the second break line 37, and the upper end of the second break line 37 may be located on the bent portion 16.

[0053] 1, 2, and 3, the fold line 39 is provided to allow the top plate 11 to bend in a valley by operating the operating unit 30 (see FIG. 9). The fold line 39 is provided between the third break lines 38 of each of the pair of side plates 13A, 13B, and extends in the width direction X.

[0054] More specifically, the fold line portion 39 includes a first end 39a adjacent to an upper end of the third break line 38 formed in the side plate 13A, and a second end 39b adjacent to an upper end of the third break line 38 formed in the side plate 13B. The first end 39a and the second end 39b are both positioned with a gap between them and the fold portion 16. In this embodiment, the third break line 38 of the side plate 13A and the third break line 38 of the side plate 13B are provided at the same position in the longitudinal direction Y, so that the fold line portion 39 extends linearly so as to be parallel to the fold portion 24.

[0055] In this embodiment, the folding line portion 39 is configured by a lead crease including a reverse crease 39c and a plurality of cut lines 39d spaced apart on the reverse crease 39c in order to improve the bendability of the top plate 11. Unlike the break lines, the adjacent cut lines 39d are spaced apart (for example, 10 mm or more) so that they are unlikely to connect to each other when an external force is applied.

[0056] 1, 5, and 6, auxiliary fold lines 40 are provided on both sides of each of the pair of side panels 13A, 13B in the longitudinal direction Y to facilitate breaking of the side panels 13A, 13B along the second break line 37. The auxiliary fold lines 40 are made of general-purpose lines, and are provided on the side panels 13A, 13B closer to the top panel 11 than the second break line 37.

[0057] The auxiliary fold line 40 is inclined toward the lid portion 20 from the second break line 37 toward the top plate 11. More specifically, the auxiliary fold line 40 extends in a direction intersecting the end of the closest folded portion 16. The upper end of the auxiliary fold line 40 is spaced apart from the folded portion 16, and the lower end of the auxiliary fold line 40 is spaced apart from the second break line 37. However, the upper end of the auxiliary fold line 40 may be located on the folded portion 16, and the lower end of the auxiliary fold line 40 may be located on the second break line 37.

[0058] Next, an example of a method for opening the packaging box 1 thus configured will be described.

[0059] When opening the packaging box 1, the operating unit 30 located on the right side in FIG. 1 is pushed from the outside to the inside in the length direction Y to open the operating unit 30. Next, the upper side of the operating unit 30 of the outer flap 22 is held with one hand, and the area of ​​the top plate 11 opposite to the operating unit 30 to be operated is held with the other hand. In this state, the operating unit 30 is operated so as to spread outward in the length direction Y and upward in the height direction Z. As a result, even if the article contained in the packaging box 1 is light, the packaging box 1 will not be lifted by the operation of the operating unit 30. As a result, the operating force is transmitted to the inner flap 21 attached to the outer flap 22 by the adhesive part, and the inner flap 21 is broken along the first breaking line 36.

[0060] After the inner flap 21 breaks, the side plates 13A, 13B subsequently break along the second break line 37. As the break of the side plates 13A, 13B along the second break line 37 progresses, the break location moves away from the operating unit 30, reducing the transmissibility of the operating force. However, in this embodiment, the side plates 13A, 13B are provided with the auxiliary fold line 40, so that when the side plates 13A, 13B break along the second break line 37 by operating the operating unit 30, the side plates 13A, 13B bend in a mountain shape along the auxiliary fold line 40. This facilitates the break of the side plates 13A, 13B along the second break line 37.

[0061] After the side panels 13A, 13B are broken along the second break line 37, the side panels 13A, 13B are subsequently broken along the third break line 38. At this time, the top panel 11 is valley folded along the fold line 39, facilitating the breaking of the side panels 13A, 13B along the third break line 38. Then, after the side panels 13A, 13B are broken, the top panel 11 can be valley folded along the fold line 39 to enter a semi-opened state, as shown in FIG.

[0062] Next, the right side that was opened in Fig. 9 is returned to its original position before opening, and the side located on the left side in Fig. 9 is operated in the same manner as the right side. That is, the operation unit 30 on the left side (not shown in Fig. 9) is held with one hand, and the right side of the folding line 39 of the top plate 11 is pressed with the other hand to operate the operation unit 30. This allows the packaging box 1 to be opened and separated into the lower part 2 and the upper part 3 as shown in Figs. 10 and 11.

[0063] The packaging box 1 configured in this manner has the following features.

[0064] Since the operating unit 30 is provided on the outer flap 22 connected to the top plate 11, when operating the operating unit 30 with one hand, the area of ​​the top plate 11 opposite to the operating side can be held down with the other hand. Therefore, even if the article contained inside is light, the packaging box 1 is not lifted by operating the operating unit 30, and the inner flap 21 can be broken along the first breaking line 36.

[0065] After the inner flap 21 is broken, the side panels 13A, 13B can be broken along the second break line 37, and then the side panels 13A, 13B can be broken along the third break line 38. After the side panels 13A, 13B are broken, the top panel 11 can be left in a semi-open state with a valley fold along the fold line 39. Thereafter, the opened side can be returned to its original position, and the opposite side can be operated in the same manner, allowing the packaging box 1 to be opened.

[0066] In this way, regardless of the weight of the article contained therein, the inner flap 21 and the side plates 13A, 13B can be easily broken, improving the ease of opening the packaging box 1 by operating the operating unit 30. Furthermore, even if the packaging box 1 is low in height and has long, narrow rectangular parallelepiped side plates 13A, 13B as in this embodiment, the side plates 13A, 13B can be reliably broken along the breaking lines 37, 38 without the breaking progressing in a direction different from the extension direction of the breaking lines 37, 38.

[0067] The second break line 37 is inclined toward the top plate 11 from the outer side of the side plates 13A, 13B in the longitudinal direction Y toward the third break line 38. Therefore, compared to a case in which the second break line 37 is inclined toward the bottom plate 12 and a case in which the second break line 37 extends parallel to the top plate 11 and the bottom plate 12, it is possible to improve the transmissibility of force caused by operation of the operating unit 30.

[0068] Therefore, the breakability of the side plates 13A, 13B at the second break line 37 can be improved, and the ease of opening the packaging box 1 can be improved.

[0069] 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.

[0070] Second embodiment Fig. 13 shows a packaging box 1 of the second embodiment, and Fig. 14 shows a blank of the packaging box 1 of the second embodiment. The packaging box 1 of the second embodiment differs from the packaging box 1 of the first embodiment in that the third break line 38 formed in the side plate 13A and the third break line 38 formed in the side plate 13B (side plate main body 14) are spaced apart in the longitudinal direction Y, and the fold line portion 39 formed in the top plate 11 is inclined.

[0071] Fig. 15 is a plan view of the packaging box 1, Fig. 16 is a bottom view of the packaging box 1, Fig. 17 is a front view of the packaging box 1, Fig. 18 is a rear view of the packaging box 1, and Fig. 19 is a left side view of the packaging box 1. The right side view is symmetrical with the left side view of Fig. 19. Fig. 20 is a cross-sectional view taken along line BB in Fig. 17, Fig. 21 is a perspective view showing the process of opening the packaging box 1, Fig. 22 is a perspective view showing the lower part 2 of the opened packaging box 1, and Fig. 23 is a perspective view showing the upper part 3 of the opened packaging box 1. An example of an article (instant noodles) to be stored inside is shown by a two-dot chain line in Figs. 21 and 22.

[0072] Fig. 24 is a plan view showing a blank of the packaging box 1. All the creases are shown in Fig. 14 in the same way as Fig. 2, but only the creases that actually appear in a plan view are shown in Fig. 24. In Figs. 17 to 19, creases that do not actually appear are shown in the same way as Fig. 14.

[0073] 14, 17, and 18, the third break line 38 is provided in the central region of each of the side plates 13A and 13B in the longitudinal direction Y, similar to the first embodiment. However, the third break line 38 is provided at a position offset to one side of the central region (the left side in this embodiment) when each of the side plates 13A and 13B is viewed directly opposite each other.

[0074] 17 and 18, the second break lines 37 are provided on both sides of each of the side plates 13A and 13B in the longitudinal direction Y. As in the first embodiment, the outer ends 37a of the second break lines 37 are all disposed at the same height in the height direction Z based on the formation positions of the first break lines 36. The inner ends 37b of the second break lines 37 extend toward the lower end of the third break line 38, and are all disposed at the same height in the height direction Z. Therefore, in the second embodiment, the inclination angle of one of the pair of second break lines 37 formed on each of the side plates 13A and 13B is different from the inclination angle of the other.

[0075] 13, 14, and 15, the fold line portion 39 is provided between the third break lines 38 of each of the pair of side plates 13A, 13B, and extends in the width direction X. However, since the pair of third break lines 38 are formed at different positions in the length direction Y, the fold line portion 39 is inclined with respect to a reference line L that passes through the center of the top plate 11 and extends in the width direction X. Note that the reference line L extends in a direction perpendicular to the fold portion 16 between the top plate 11 and the side plates 13A, 13B, and extends parallel to the fold portion 24 between the top plate 11 and the lid portion 20.

[0076] 13, 20, and 21, the operating part 30 is provided at a position offset in the width direction X with respect to the outer flap 22. The forming position of the operating part 30 in the width direction X is offset toward the farther of the third break lines 38 formed on each of the pair of side plates 13A, 13B.

[0077] 13 and 17, the third break line 38 of the side plate 13A is provided at a position offset to the left side. Therefore, in Fig. 13, the distance from the third break line 38 of the side plate 13A to the right-side cover portion 20 is greater than the distance from the third break line 38 of the side plate 13A to the left-side cover portion 20. Therefore, the operating portion 30 formed on the cover portion 20 (outer flap 22) located on the right side in Fig. 13 is formed on the side plate 13A side rather than the center in the width direction X, as shown in Fig. 20.

[0078] 13 and 18, the third break line 38 of the side plate 13B is provided in a position offset to the right side in Fig. 13. Therefore, in Fig. 13, the distance from the third break line 38 of the side plate 13B (see Fig. 18) to the left side of the lid portion 20 is greater than the distance from the third break line 38 of the side plate 13B to the right side of the lid portion 20. Therefore, the operating portion 30 formed on the lid portion 20 (outer flap 22) located on the left side in Fig. 13 is formed on the side plate 13B side rather than the center in the width direction X, as shown in Fig. 21.

[0079] 13 and 20, the operating part 30 is provided between a pair of inner flaps 21 that constitute the same cover part 20. In other words, the operating part 30 is provided in an area of ​​the outer flap 22 that does not overlap with the inner flap 21. This prevents a decrease in the operability of the operation of opening the operating part 30.

[0080] The packaging box 1 of the second embodiment is opened in the same manner as in the first embodiment. That is, the opening operation is performed while holding the operation unit 30 with one hand and pressing the area of ​​the top plate 11 opposite to the operation unit 30 with the other hand. However, in the second embodiment, one and the other of the pair of third break lines 38 are provided with a gap in the longitudinal direction Y, and the formation position of the operation unit 30 is biased toward the far side of the pair of third break lines 38. Therefore, when the operation unit 30 is operated, the inner flap 21 located near the operation unit 30 and the side plate (side plate 13A in FIG. 21) connected to the inner flap 21 are broken, and then the far side inner flap 21 and the side plate (side plate 13B in FIG. 21) connected to the inner flap 21 are broken.

[0081] In this way, the pair of third break lines 38 are spaced apart in the length direction Y, and the operating part 30 is positioned offset in the width direction X, so that one and the other of the pair of side plates 13A, 13B can be broken in order. This reduces the force required for the opening operation, and improves the ease of opening the packaging box 1. In addition, the operating part 30 is positioned offset toward the farther one of the pair of third break lines 38, so that both side plates 13A, 13B can be reliably broken along the second break lines 37.

[0082] Third embodiment Fig. 25 shows a packaging box 1 of the third embodiment, and Fig. 26 shows a blank of the packaging box 1 of the third embodiment. The packaging box 1 of the third embodiment differs from the packaging box 1 of the first embodiment in that the fold line portion 39 formed in the top plate 11 is configured by a pair of fold lines 39e, 39g, and a dedicated pressing portion 45 is provided between these fold lines 39e, 39g.

[0083] Fig. 27 is a plan view of the packaging box 1, Fig. 28 is a bottom view of the packaging box 1, Fig. 29 is a front view of the packaging box 1, Fig. 30 is a rear view of the packaging box 1, and Fig. 31 is a left side view of the packaging box 1. The right side view is symmetrical with the left side view of Fig. 31. Fig. 32 is a cross-sectional view taken along line BB in Fig. 29, Fig. 33 is a perspective view showing the process of opening the packaging box 1, Fig. 34 is a perspective view showing the lower part 2 of the opened packaging box 1, and Fig. 35 is a perspective view showing the upper part 3 of the opened packaging box 1. An example of an article (instant noodles) to be stored inside is shown by a two-dot chain line in Figs. 33 and 34.

[0084] Fig. 36 is a plan view showing a blank of a packaging box 1. All the creases are shown in Fig. 26 in the same way as Fig. 2, but only the creases that actually appear in a plan view are shown in Fig. 36. In Figs. 29 to 31, creases that do not actually appear are shown in the same way as Fig. 26.

[0085] 25 to 27, the fold line portion 39 includes a first fold line 39e having a first end 39a adjacent to the upper end of the third break line 38 of the side panel 13A, and a second fold line 39g having a second end 39b adjacent to the upper end of the third break line 38 of the side panel 13B. An inner end 39f of the first fold line 39e and an inner end 39h of the second fold line 39g are positioned with a gap in between in the width direction X. Both fold lines 39e and 39g are composed only of reverse creases and are arranged on the same straight line.

[0086] 25 to 27, the pressing portion 45 is provided between the fold lines 39e, 39g of the top plate 11. The pressing portion 45 is defined by an endless break line 46. The fold line portion 39 is not provided within the break line 46. The pressing portion 45 in this embodiment is generally circular, but the shape may be an ellipse or polygon as long as it is endless, and various modifications are possible.

[0087] The break line 46 is composed of a plurality of cut lines provided at a breakable interval. The break line 46 has a pair of arc portions 46a at the apex in the width direction X, which are convex toward the fold lines 39e, 39g. All cut lines other than the cut lines constituting the arc portions 46a are arc-shaped with the same curvature. One apex of the pair of arc portions 46a is located on the inner end 39f of the first fold line 39e, and the other apex is located on the inner end 39h of the second fold line 39g. However, the apex of the arc portion 46a and the inner ends 39f, 39h of the fold lines 39e, 39g may be located at a breakable interval.

[0088] When opening the packaging box 1 of the second embodiment, the operating part 30 is held with one hand, and the pressing part 45 located on the opposite side of the operating part 30 to be operated on the top plate 11 is pressed with the other hand. Then, the operating part 30 is operated so as to be spread outward in the length direction Y and upward in the height direction Z, whereby the inner flap 21 is broken along the first breaking line 36, the side plates 13A and 13B are subsequently broken along the second breaking line 37, and the side plates 13A and 13B are further subsequently broken along the third breaking line 38. Then, the top plate 11 is valley-folded along the fold line 39 and broken along the breaking line 46, so that the half-opened state shown in FIG. 33 can be achieved. Similarly, the opposite side of the packaging box 1 can be operated to achieve the opened state shown in FIGS. 34 and 35.

[0089] Thus, in the third embodiment, the fold line portion 39 is composed of a pair of fold lines 39e, 39g, and the pressing portion 45 defined by the break line 46 is provided between the pair of fold lines 39e, 39g. Therefore, whether one side or the other side of the longitudinal direction Y of the packaging box 1 is operated, the opening operation portion 30 can be operated with one hand and the pressing portion 45 can be pressed with the other hand. This further improves the ease of opening the packaging box 1.

[0090] In addition, in the packaging box 1 of the second embodiment shown in Figures 13 to 24, the fold line portion 39 may be formed by a pair of fold lines 39e, 39g, and a pressing portion 45 defined by a break line 46 may be provided between the fold lines 39e, 39g.

[0091] The packaging box 1 of the present invention is not limited to the configuration of the above embodiment, and various modifications are possible.

[0092] For example, the break lines 36, 37 may be configured with a plurality of cut lines extending linearly to form perforations, and the break line 38 may be configured with a one-sided zipper or a Y-shaped zipper, and any type of break lines 36 to 38 may be applied as long as they can break the corresponding inner flap 21 and side panels 13A, 13B. Of course, the type of break line 46 may also be changed as necessary.

[0093] The folding line portion 39 may be a lead crease consisting of a general-purpose crease and a cutting line, or may be composed of only a general-purpose crease, and can be changed as necessary as long as the configuration allows the top plate 11 to be folded.

[0094] The packaging box 1 is not limited to being made of a paper corrugated cardboard sheet, and may be made of a single layer of cardboard.

[0095] The outer peripheral wall 10 of the packaging box 1 is not limited to a rectangular cylindrical shape, but may be an octagonal cylindrical shape. In other words, the side plates 13A and 13B may be connected to the top plate 11 and the bottom plate 12, respectively, via chamfered plates. [Explanation of symbols]

[0096] 1...Packaging box 2…Lower part 3...Upper part 10...Outer wall 11…Tabletop 12…Bottom plate 13A,13B…Side plate 14…Side panel body 15...Attached section 16...Bending part 16a...Folding line 17...Bending part 17a...Folding line 20…Lid part 21…Inner flap 22…Outer flap 23...Bending part 23a...Folding line 24...Bending part 24a...Folding line 30...Operation unit 31…Outside cutting line 32…Center cutting line 33...Folding line 34…Break-stop part 35…Notch 36…First break line 36a...1st cutting line 36b…Second cutting line 37…Second break line 37a…outer end 37b…Inner end 37c…1st cutting line 37d…Second cutting line 38…Third break line 39...Fold line part 39a...first end 39b…Second end 39c...reverse lines 39d…Cutting line 39e…1st folding curve 39f…Inner end 39g…Second folding curve 39h…Inner end 40…Auxiliary folding line 45…Pressing part 46…Break line 46a…Arc section L…Reference line X…Width direction (first direction) Y: Length direction (second direction) Z: Height direction (third direction)

Claims

1. A top plate extending in a first direction and a second direction intersecting the first direction; a bottom plate provided with a gap in a third direction intersecting both the first direction and the second direction with respect to the top plate; a pair of side plates connected to ends of the top plate and the bottom plate in the first direction and extending in the second direction and the third direction; an inner flap connected to an end of each of the pair of side panels in the second direction; An outer flap connected to each end of the top plate and the bottom plate in the second direction and disposed outside the inner flap; An opening operation portion provided on each of the outer flaps connected to the top plate; A first break line is provided on each of the inner flaps and extends in the first direction; a pair of second break lines provided on each of the pair of side plates adjacent to the first break lines and extending in the second direction; a third break line provided in a central region of each of the pair of side plates in the second direction and extending in the third direction from the second break line toward the top plate; A fold line portion provided on the top plate, the fold line portion having a first end adjacent to an upper end of one of the pair of third break lines and a second end adjacent to an upper end of the other of the pair of third break lines; Equipped with The fold line portion has a first fold line having the first end and a second fold line having the second end and spaced apart from the first fold line in the first direction, The packaging box has a pressing portion defined by an endless break line between the first fold line and the second fold line on the top plate.

2. The packaging box according to claim 1 , wherein the second break line is inclined from an outer side of the side panel in the second direction toward the top panel toward the third break line.

3. the one third break line and the other third break line are provided at an interval in the second direction, The fold line portion is inclined with respect to a reference line extending in the first direction. The packaging box according to claim 1 or 2.

4. The packaging box according to claim 3 , wherein a forming position of the opening operation portion in the first direction is biased toward the farther one of the pair of third breaking lines.

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