JP6959833B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box.

The packaging box is provided with a lid portion composed of a pair of inner flaps and a pair of outer flaps at the end of the outer peripheral portion of the cylinder. The inner flap and the outer flap are attached (hot melted) with an adhesive such as a heat-melted resin. When opening the lid portion, the outer flap is operated, the outer flap is peeled off from the inner flap (attached portion), and then the inner flap is operated. Therefore, opening the lid requires an operation of the outer flap and an operation of the inner flap, resulting in poor workability.

Patent Document 1 discloses a package in which the end of the outer peripheral portion can be opened by breaking a part of the inner flap attached by the attachment portion by operating the outer flap. The inner flap is provided with a first breaking portion extending in a direction intersecting the operating direction of the outer flap and a second breaking portion extending in the operating direction of the outer flap. Further, the inner flap is provided with a folding curve for preventing peeling extending in a direction intersecting the operation direction between the sticking portion and the first breaking portion.

JP-A-2017-109746

In the package of Patent Document 1, since the inner flaps can be separated together by operating the outer flaps, the lid portion at the end of the outer peripheral portion can be opened with good workability.

An object of the present invention is to break the packaging box more smoothly and open the lid portion.

The packaging box of the present invention is connected to the first side plate, the second side plate which is connected to the first side of the first side plate and is bent with respect to the first side plate, and the first side of the first side plate. An inner flap that is connected to the intersecting second side and is bent in the same direction as the second side plate with respect to the first side plate, and a second side plate that intersects the second side of the first side plate. It includes an outer flap that is connected to three sides and bent so as to overlap the outer surface of the inner flap, and a sticking portion to which the inner flap and a part of the outer flap are stuck.

A first aspect of the present invention is a first fracture provided on the inner flap so as to be located closer to the tip end side of the outer flap than the attachment portion and extending in a direction intersecting the second side of the first side plate. A second fractured portion that is provided on the inner flap or the first side plate, extends along the second side of the first side plate, and is fractured after the inner flap is fractured along the first fractured portion. And a crease line that is provided on the inner flap so as to be located between the sticking portion and the second fractured portion, extends along the second fractured portion, and assists the fracture of the second fractured portion. Provide a packaging box to prepare. This first aspect includes a configuration in which the second fractured portion is provided on the inner flap, a configuration provided on the first side plate, and a configuration provided between the inner flap and the first side plate (ridge portion).

When opening the packaging box of the first aspect, the tip of the outer flap is grasped and operated toward the second side plate. Then, the operating force of the outer flap is transmitted to the inner flap via the sticking portion, and the inner flap is broken along the first breaking portion. Subsequently, when the inner flap is bent along the crease line, a tensile force in the direction intersecting the second fractured portion acts, so that the first side plate or the inner flap is subsequently fractured along the second fractured portion. Will be done. In this way, since the outer flap can be smoothly broken along the second broken portion after the first broken portion is broken without peeling from the sticking portion, the openability of the lid portion composed of the inner flap and the outer flap is improved. can.

The end of the first fractured portion on the first side plate side and the second fractured portion are located at intervals. According to this aspect, since the first fractured portion and the second fractured portion extending in different directions are not continuous, the decrease in rigidity of the packaging box can be minimized.

The crease line is inclined from the first breaking portion side toward the second side plate side and from the sticking portion side toward the first side plate side. According to this aspect, when the inner flap is bent along the crease line, the displacement (tensile force) on the first fractured portion side is larger than that on the second side plate side. Therefore, by operating the outer flap, the inner flap or the first side plate can be reliably broken along the second breaking portion.

The second break portion is provided on the second side of the first side plate. Alternatively, the second fractured portion is provided on the first side plate so as to be located at a distance from the second side, and the first side plate has the first fractured portion and the second fractured portion. A third break portion is provided to connect the two.

The outer flap is provided with an auxiliary folding curve extending from the center side of the tip of the outer flap to the second side plate side. According to this aspect, the outer flap is bent (mountain-folded) along the central auxiliary folding curve by the opening operation, and a shearing force acts on the first fractured portion of the inner flap, so that the first fractured portion is affected. The inner flap can be reliably broken along.

The outer flap is provided with an auxiliary folding curve that is located between the third side of the second side plate and the attachment portion and extends along the third side. According to this aspect, the outer flap is bent (valley-folded) along the auxiliary folding curve on the second side plate side by the opening operation, so that a tensile force acts on the first fractured portion of the inner flap. That is, when the outer flap is provided with two types of auxiliary folding curves, a shearing force and a tensile force act on the first fractured portion, so that the inner flap can be reliably fractured along the first fractured portion. Further, when the outer flap is valley-folded along this auxiliary fold curve, the mountain fold of the inner flap along the crease line is promoted. Therefore, the breakage of the first side plate or the inner flap along the second breakage portion can also be promoted.

A second aspect of the present invention is a fractured portion provided on the inner flap so as to be located closer to the tip end side of the outer flap than the attachment portion and extending in a direction intersecting the second side of the first side plate. , Provided on the inner flap so as to be located between the sticking portion and the second side of the first side plate, extend along the second side, and reach the second side after the fractured portion is broken. A packaging box is provided with a crease line that assists in breaking along.

Also in this second aspect, since the outer flap can be smoothly broken along the second side of the first side plate following the first broken portion without peeling from the sticking portion, the lid portion composed of the inner flap and the outer flap Can improve the openability of.

In the packaging box of the present invention, the inner flap is bent along the crease line by the operation of the outer flap, so that a tensile force acts on the second fractured portion or the second side (ridge portion) of the first side plate. Therefore, the outer flap does not peel off from the sticking portion, and after the inner flap is broken along the first broken portion, the portion forming the second broken portion can be broken along the operation direction of the outer flap, so that the lid portion can be broken. Can improve the openability of.

The perspective view of the packaging box which concerns on 1st Embodiment of this invention. FIG. 1 is a cross-sectional view. The plan view which shows the blank of the packaging box of FIG. The perspective view which shows one process of the opening operation. The perspective view which shows the other process of the opening operation. The perspective view which shows the other process of the opening operation. The perspective view which shows the opened state. The perspective view of the packaging box which concerns on 2nd Embodiment. FIG. 5 is a plan view showing a blank of the packaging box of FIG. The perspective view which shows the opened state of the packaging box of FIG. The perspective view of the packaging box which concerns on 3rd Embodiment. FIG. 5 is a plan view showing a blank of the packaging box of FIG. The perspective view which shows one step of the opening operation of the packaging box of FIG. FIG. 5 is a perspective view showing another step of the opening operation of the packaging box of FIG. The perspective view of the packaging box which concerns on 4th Embodiment. FIG. 5 is a plan view showing a blank of the packaging box of FIG. The perspective view which shows the opened state of the packaging box of FIG. The perspective view of the packaging box which concerns on 5th Embodiment. The perspective view of the packaging box which concerns on 6th Embodiment. FIG. 19 is a cross-sectional view. FIG. 9 is a plan view showing a blank of the packaging box of FIG. FIG. 9 is a perspective view showing one step of opening work of the packaging box of FIG. The perspective view which shows the other process of the opening operation. The perspective view which shows the other process of the opening operation. The perspective view which shows the opened state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
1 to 7 show the packaging box 10 according to the first embodiment of the present invention. As shown in FIGS. 1 and 2, the packaging box 10 is a wraparound case including a square cylindrical outer peripheral portion 12 and a lid portion 20 for closing the opening of the outer peripheral portion 12. The lid portion 20 includes a pair of inner flaps 21 and 21 and a pair of outer flaps 23 and 25, and these are attached (hot melted) by an adhesive (adhesive portions 28A, 28B) such as a heat-melted resin. There is. The packaging box 10 is provided with broken portions 30 and 32 for opening a part of the lid portion 20. In the present embodiment, a part of the inner flap 21 can be smoothly broken along the broken portions 30 and 32 without peeling the outer flap 25 from the sticking portions 28A and 28B.

(Outline of packaging box)
The packaging box 10 is formed by bending and fixing a blank shown in FIG. 3 at a predetermined portion. The blank is formed by punching a corrugated cardboard sheet made of paper by a well-known paper punching device. The corrugated cardboard sheet has a structure in which a wavy inner surface is arranged between a front liner (outer surface of the packaging box 10) and a back liner (inner surface of the packaging box 10). The alternate long and short dash line in FIG. 3 is a general-purpose ruled line formed by inserting a ruled line from the back liner so as to compress the wall thickness. The alternate long and short dash line in FIG. 3 is a reverse ruled line formed by inserting a ruled line from the front liner so as to compress the wall thickness. The solid line in FIG. 3 is a cutting line formed by inserting a blade from the back liner to the front liner, and a shape line (side) formed by punching.

In the following description, the direction in which the lids 20 and 20 face each other is referred to as the X direction, the direction in which the side plates 13 and 13 of the outer peripheral portion 12 face each other is referred to as the Y direction, and the bottom plate 14 and the top plate 15 of the outer peripheral portion 12 face each other. The direction of movement is called the Z direction. In the packaging box 10 of the present embodiment, the dimension in the X direction is formed longer than the dimension in the Y direction, but the dimension in the Y direction may be formed longer than the dimension in the X direction, and the dimensions in the X direction and Y are formed. The dimensions in the directions may be formed to be the same, and such an aspect is also included in the present invention.

As shown in FIGS. 1 and 2, the outer peripheral portion 12 includes a pair of side plates (first side plates) 13, 13, a bottom plate 14, and a top plate (second side plate) 15. Among them, the side plates 13 and 13 have the same square shape in which the dimension in the X direction is longer than the dimension in the Z direction. The bottom plate 14 and the top plate 15 have substantially the same square shape in which the dimension in the X direction is longer than the dimension in the Y direction. The bottom plate 14 and the top plate 15 are relatively bent in a direction orthogonal to the side plates 13 and 13.

With reference to FIG. 3, the top plate 15, the side plate 13, the bottom plate 14, and the side plate 13 are connected in this order from the upper side to the lower side via the folding curve 17. The portion where the folding curve 17 is formed is the first side of the side plate 13. A sticking plate 16 is continuously provided on the side plate 13 located at the lower end of FIG. 3 via a folding curve 17. The sticking plate 16 is stuck to the inner surface (back liner) of the top plate 15 located at the upper end of FIG. 3 by the sticking portion 28. The folding curve 17 is composed of a general-purpose ruled line, and extends in the X direction in the assembled state of FIGS. 1 and 2.

Subsequently, referring to FIGS. 1 and 2, the lid portions 20 and 20 have the same square shape in which the dimension in the Y direction is longer than the dimension in the Z direction. The individual lids 20 include inner flaps 21 and 21 connected to the X-direction ends of the side plates 13 and 13, outer flaps 23 connected to the X-direction ends of the bottom plate 14, and X of the top plate 15. It is composed of an outer flap 25 connected to the end in the direction.

The inner flap 21 is connected to the side plate 13 extending in the Z direction (second side) via a folding curve 22 made of a general-purpose ruled line. The inner flaps 21 and 21 are bent relative to the side plates 13 and 13 in the same direction as the bottom plate 14 and the top plate 15. The lower outer flap 23 is continuously provided on the side extending in the Y direction of the bottom plate 14 via a folding curve 24 made of a general-purpose ruled line. The upper outer flap 25 is connected to the side (third side) of the top plate 15 extending in the Y direction via a folding curve 26 made of a general-purpose ruled line. The outer flaps 23 and 25 are bent so as to overlap the outer surface (front liner) side of the inner flaps 21 and 21, and are attached by the attachment portions 28A and 28B.

Referring to FIG. 3, the protruding dimension of the outer flap 23 from the folding curve 24 to the tip of the outer flap 23 is the same as the protruding dimension of the outer flap 25 from the folding curve 26 to the tip of the outer flap 25. These protruding dimensions are set to a length at which the tips of the side plates abut each other (half the dimension of the side plate 13 in the Z direction). Further, the protruding dimension of the inner flap 21 from the folding curve 22 to the tip of the inner flap 21 is set to be the same as the protruding dimension of the outer flaps 23 and 25. As a result, a predetermined gap is formed between the tips of the inner flaps 21 and 21 located at the same end in the X direction.

The packaging box 10 is sealed as follows, for example. First, the blank of FIG. 3 is arranged so that the back liner is located on the upper side, and the article to be accommodated is arranged on the bottom plate 14. Then, after bending the side plates 13 and 13 with respect to the bottom plate 14, the sticking plate 16 and the top plate 15 are bent with respect to the side plates 13 and 13. Then, the top plate 15 and the sticking plate 16 are stuck by the sticking portion 28.

Next, the inner flaps 21 and 21 are bent with respect to the side plates 13 and 13. Then, the outer flap 23 is bent with respect to the bottom plate 14, and the outer flap 25 is bent with respect to the top plate 15. Then, the overlapping portions of the inner flaps 21 and 21 and the outer flaps 23 and 25 are attached by the attachment portions 28A and 28B. As a result, the lid portion 20 is formed, and the opening of the outer peripheral portion 12 is sealed (closed).

Referring to FIG. 3, the sticking portion 28 of the top plate 15 and the sticking plate 16 extends elongated along the sticking plate 16 (X direction). Referring to FIGS. 1 and 2, the attachment portions 28A and 28B of the inner flaps 21 and 21 and the outer flaps 23 and 25 are elongated in the Y direction. The Y direction is a direction orthogonal to the operation direction (Z direction) when the outer flap 25 is opened. Further, the sticking portion 28A located on the bottom plate 14 side and the sticking portion 28B located on the top plate 15 side are arranged vertically at intervals with respect to the center in the Z direction. Further, the inner end of the attachment portions 28A and 28B in the Y direction and the tip of the inner flap 21 are located at predetermined intervals, and the outer end of the attachment portions 28A and 28B in the Y direction and the folding curve 22 are located. It is located at a predetermined interval.

(Opening structure of packaging box)
The packaging box 10 of the first embodiment is opened in a tray shape by breaking the lid portion 20 (inner flap 21) and the side plate 13 at a substantially central portion in the Z direction (see FIG. 7). The inner flap 21 of the lid portion 20 is broken by the operation of the upper outer flap 25, the side plate 13 is broken by the operation of the central operation portion 40, and the top plate 15 side is separated from each other. The packaging box 10 is provided with a first breaking portion 30, a second breaking portion 32, and a crease line 34 for breaking the inner flap 21, and a breaking portion 45 for breaking the side plate 13. There is.

The first broken portion 30, the second broken portion 32, the crease line 34, and the broken portion 45 are for opening the packaging box 10, not for disassembling the packaging box 10. Further, the first breaking portion 30, the second breaking portion 32, and the crease line 34 are provided so as to avoid the sticking position by the sticking portions 28A and 28B.

(Break structure of lid)
As shown in FIGS. 1 to 3, the first fractured portion 30 is provided on the inner flap 21 so as to be located between the attachment portions 28A and 28B, that is, on the tip side of the outer flap 25 with respect to the attachment portion 28B. ing. The first fractured portion 30 extends substantially in the Y direction so as to intersect the operating direction (upward in the Z direction) of the outer flap 25. Specifically, the first fractured portion 30 includes a first portion 30a located on the tip end side of the inner flap 21 and a second portion 30b located on the side plate 13 side of the inner flap 21. The first portion 30a extends in parallel along the folding curve 26. The second portion 30b is curved or bent from the end of the first portion 30a toward the top plate 15.

More specifically, the first fractured portion 30 includes a single zipper extending from the tip end side of the inner flap 21 to the side plate 13 side. The single zipper includes a plurality of first cutting lines extending in a perforated manner at intervals, and a second cutting line extending inclined from the end of each first cutting line on the side plate 13 side toward the bottom plate 14. The side plate 13 side of the first fractured portion 30 is inclined toward the top plate 15. The end of the first fractured portion 30 located on the tip end side of the inner flap 21 is located at a distance from the tip end of the inner flap 21. The ends of the first fractured portion 30 located on the side plate 13 side are located at intervals from the folding curve 22.

The second fractured portion 32 is subsequently fractured after the inner flap 21 is fractured along the first fractured portion 30. The second fractured portion 32 is provided on the folding curve 22 (second side) at the end of the side plate 13, that is, on the ridge between the side plate 13 and the inner flap 21 so as to extend in the operating direction of the outer flap 25. There is. The second fractured portion 32 is composed of a single zipper similar to the first fractured portion 30, and the second cutting line thereof is inclined from the end on the bottom plate 14 side into the inner flap 21.

The end of the second fractured portion 32 on the bottom plate 14 side is located closer to the top plate 15 than the center of the folding curve 22 in the Z direction, and is positioned at a predetermined distance from the end of the first fractured portion 30 on the side plate 13 side. do. The ends of the second fractured portion 32 on the top plate 15 side are located at a predetermined interval with respect to the folding curve 17. As described above, since the first breaking portion 30 and the second breaking portion 32 extending in different directions are not continuous, the decrease in rigidity of the packaging box 10 can be minimized. However, the second fractured portion 32 and the first fractured portion 30 may be made continuous as needed. Further, the second breaking portion 32 and the folding curve 17 may be made continuous as needed.

The crease line 34 assists the break along the second break portion 32, and is located on the inner flap 21 along the second break portion 32 so as to be located between the sticking portion 28B and the second break portion 32. It is provided. The crease line 34 is composed of a general-purpose ruled line, and is inclined from the first breaking portion 30 side toward the top plate 15 side and gradually from the sticking portion 28B side toward the side plate 13 side.

Specifically, the fold line 34 extends from the vicinity of the attachment portion 28B toward the intersection of the fold curves 22 and 26. The ends of the crease line 34 on the first break portion 30 side are located at intervals with respect to the first break portion 30, and the tip side of the inner flap 21 (the end on the side plate 13 side of the first break portion 30) ( Located on the inside in the Y direction). The ends of the fold line 34 on the top plate 15 side are located at intervals with respect to the second fractured portion 32, and are located at the intermediate portion of the second fractured portion 32 in the Z direction.

The center of the tip of the outer flap 25 is gripped, and as shown in FIG. 4, the outer flap 25 is operated toward the top plate 15. Then, the operating force on the outer flap 25 is transmitted to the inner flaps 21 and 21 via the sticking portion 28B, and the inner flaps 21 and 21 are broken along the first breaking portion 30. At this time, the force acting on the first breaking portion 30 is transmitted from the tip of the inner flap 21 to the side plate 13 side, and since this direction is the direction in which the sticking portion 28B extends, the outer flap 25 is peeled off from the sticking portion 28B. There is nothing to do.

When the outer flap 25 is subsequently operated after the fracture of the inner flap 21 along the first fracture portion 30 is completed, the inner flap 21 is mountain-folded along the crease line 34 as shown in FIG. As a result, a tensile force in the Y direction toward the center of the lid portion 20 intersecting the second fracture portion 32 acts on the second fracture portion 32. Further, in the present embodiment, the displacement (tensile force) on the first breaking portion 30 side is larger than that on the top plate 15 side by setting the inclination direction of the crease line 34. Therefore, as shown in FIG. 6, following the fracture along the first fracture portion 30, the ridge portion between the side plate 13 and the inner flap 21 can be reliably fractured along the second fracture portion 32.

By operating the outer flap 25 in this way, the inner flap 21 can be smoothly broken along the broken portions 30 and 32 without peeling the outer flap 25 from the sticking portion 28B. Therefore, the openability of the lid portion 20 including the inner flaps 21 and 21 and the outer flaps 23 and 25 can be improved.

(Auxiliary structure for breaking the lid)
As shown in FIGS. 1 to 3, the outer flap 25 has a pair of first auxiliary folding curves 36, 36 and a pair of first auxiliary folding curves 36, 36 in order to assist the breaking along the breaking portions 30 and 32 (improve the opening property). The second auxiliary folding curves 38 and 38 of the above are provided.

The first auxiliary folding curve 36 assists the breaking of the inner flap 21 along the first breaking portion 30, and is provided at the center of the outer flap 25 in the Y direction. The first auxiliary folding curve 36 is provided between the tips of a pair of inner flaps 21 and 21 constituting the lid portion 20. Specifically, the first auxiliary folding curve 36 is composed of a general-purpose ruled line, extends from the center side of the tip of the outer flap 25 toward the top plate 15, and is inclined outward in the Y direction (direction approaching the side plate 13). However, the first auxiliary folding curve 36 may be formed so as to extend in the Z direction so as to be located parallel to the folding curve 22.

The end of the first auxiliary folding curve 36 located on the tip side of the outer flap 25 is located at a distance from the tip of the outer flap 25. The end of the first auxiliary folding curve 36 located on the top plate 15 side is located at a distance from the top plate 15 (folding curve 26).

The second auxiliary folding curve 38 assists the breaking of the inner flap 21 along the first breaking portion 30 and the breaking of the inner flap 21 along the second breaking portion 32, and is outside the outer flap 25 in the Y direction. It is provided in. The second auxiliary folding curve 38 is composed of a reverse ruled line, is located between the folding curve 26 at the end of the top plate 15 and the sticking portion 28B, and extends along the folding curve 26. As most clearly shown in FIG. 2, the second auxiliary fold curve 38 is outward from the side edge of the outer flap 25 so that the extension line (not shown) of the second auxiliary fold curve 38 intersects the fold line 34. It is inclined toward the center of the flap 25 toward the top plate 15 side.

The end of the side plate 13 of the second auxiliary folding curve 38 is located in the vicinity of the attachment portion 28 and at a distance from the side edge of the outer flap 25. The end of the second auxiliary folding curve 38 located on the center side of the outer flap 25 is positioned at a distance from the folding curve 26, and is also positioned at a distance from the end of the first auxiliary folding curve 36 on the top plate 15 side. do. In the present embodiment, when the second auxiliary folding curve 38 is extended, the inclination angles of the auxiliary folding curves 36 and 38 are set so as to intersect the extension line of the first auxiliary folding curve 36 on the folding curve 26.

As shown in FIG. 4, when the outer flap 25 is opened, the outer flap 25 folds along the central first auxiliary fold curve 36 and valleys along the second auxiliary fold curve 38 on the side plate 13 side. It breaks. A shearing force acts on the first fractured portion 30 of the inner flap 21 due to the mountain fold of the outer flap 25 according to the first auxiliary folding curve 36. Further, a tensile force acts on the first fractured portion 30 of the inner flap 21 due to the valley fold of the outer flap 25 due to the second auxiliary folding curve 38. Then, since these forces together act on the first breaking portion 30, the inner flap 21 can be reliably broken along the first breaking portion 30.

After the inner flap 21 is broken along the first fracture portion 30, the inner flap 21 is mountain-folded along the crease line 34 due to the valley fold of the outer flap 25 along the second auxiliary folding curve 38. Then, due to the valley fold of the outer flap 25 along the second auxiliary folding curve 38, the inner flap 21 is pulled outward through the sticking portion 28B, so that the displacement amount of the inner flap 21 becomes large. Therefore, since the fracture of the ridge portion between the side plate 13 and the inner flap 21 along the second fracture portion 32 is promoted, the fracture workability of the inner flap 21 by the operation of the outer flap 25 can be improved.

(Break structure of side plate)
As shown in FIGS. 1 and 3, the operation unit 40 is for operating the side plate 13 toward the top plate 15, and is provided substantially in the center of the side plate 13. The operating portion 40 is defined by a folding curve 41, a pair of first breaking lines 42, 42, and a second breaking line 43.

The folding curve 41 is composed of a general-purpose ruled line and extends in the X direction along the folding curve 17. The first break line 42 is composed of two or more cutting lines formed at intervals, and extends in an arc shape in the X direction from both ends of the folding curve 41 toward the inner flap 21. The second break line 43 is composed of two or more cutting lines formed at intervals, and extends in an arc shape from one of the outer ends of the pair of first break lines 42, 42 in the X direction to the other. ..

The breaking portions 45 break the side plates 13 and 13 by operating the operating portion 40, and are provided on both sides of the operating portion 40 in the X direction. The break portion 45 is composed of a plurality of cutting lines provided at predetermined intervals, and extends from the operation portion 40 toward the inner flap 21 along the folding curve 17. Specifically, the break portion 45 includes a first break line 45a, a second break line 45b, and a third break line 45c.

The first break line 45a extends from the operating portion 40 toward the folding curve 22 in parallel with the folding curve 17. The second break line 45b is inclined outward in the X direction from the outer end of the first break line 45a toward the top plate 15. The third break line 45c extends parallel to the fold curve 17 from the outer end of the second break line 45b to the vicinity of the fold curve 22. As a whole, the fractured portion 45 may be formed in parallel with the folding curve 17, may be formed in an arc shape, or may be formed in a wavy shape in which irregularities are repeated, and the shape may be formed as necessary. It can be changed.

When breaking the side plate 13 along the breaking portion 45, the operating portion 40 is pushed inward in the Y direction. As a result, the side plate 13 is broken along the first breaking lines 42 and 42 and the second breaking line 43, and the operating portion 40 is opened.

Next, a hand is inserted into the operation unit 40, the top plate 15 side of the side plate 13 is gripped, and the operation is performed toward the top plate 15. As a result, the side plate 13 is broken along the first break line 45a, the second break line 45b, and the third break line 45c. When the break reaches the outer end of the third break line 45c, the packaging box 10 can be opened as shown in FIG. 7 by connecting to the broken edge along the second break portion 32 or the second break portion 32.

(Auxiliary structure for breaking side plate)
As shown in FIGS. 1 and 3, the side plate 13 has a pair of third auxiliary folding curves 47, 47 and a pair of fourth auxiliary folding curves 48, 48 in order to assist the breaking along the fracture portion 45. And a pair of fifth auxiliary folding curves 49 and 49 are provided. These auxiliary folding curves 47 to 49 are provided on the side plate 13 so as to be located on the top plate 15 side of the fractured portion 45.

The third auxiliary folding curve 47 is composed of a general-purpose ruled line and is formed in the central portion of the side plate 13 in the X direction. The third auxiliary folding curve 47 extends from the operation portion 40 side to the top plate 15 side and is inclined outward in the X direction. However, the third auxiliary folding curve 47 may be formed so as to extend in the Z direction so as to be located parallel to the folding curve 22. The lower end of the third auxiliary folding curve 47 on the operation portion 40 side is located at a distance from the operation portion 40. The upper end of the third auxiliary folding curve 47 on the top plate 15 side is located at a distance from the folding curve 17.

The fourth auxiliary folding curve 48 is formed of a reverse ruled line, and is formed on the side plate 13 so as to be located outside the third auxiliary folding curve 47 in the X direction. The fourth auxiliary folding curve 48 is inclined in the opposite direction to the third auxiliary folding curve 47. That is, the fourth auxiliary folding curve 48 extends from the third breaking line 45c side to the top plate 15 side and is inclined inward in the X direction. However, the fourth auxiliary folding curve 48 may be formed so as to extend in the Z direction so as to be located parallel to the folding curve 22. The lower end of the fourth auxiliary folding curve 48 on the third breaking line 45c side is located at a distance from the third breaking line 45c. The upper end of the fourth auxiliary folding curve 48 on the top plate 15 side is located at a distance from the folding curve 17.

The fifth auxiliary folding curve 49 is composed of a general-purpose ruled line, and is formed on the side plate 13 so as to be located outside the fourth auxiliary folding curve 48 in the X direction. The fifth auxiliary folding curve 49 is inclined in the opposite direction to the fourth auxiliary folding curve 48, and is inclined in the same direction as the third auxiliary folding curve 47. That is, the fifth auxiliary folding curve 49 extends from the third breaking line 45c side to the top plate 15 side and is inclined outward in the X direction. However, the fifth auxiliary folding curve 49 may be formed so as to extend in the Z direction so as to be located parallel to the folding curve 22. The lower end of the fifth auxiliary folding curve 49 on the third breaking line 45c side is located at a distance from the third breaking line 45c. The upper end of the fifth auxiliary folding curve 49 on the top plate 15 side is located at a distance from the folding curve 17.

By the opening operation, the side plate 13 is mountain-folded along the central third auxiliary fold curve 47, valley-folded along the fourth auxiliary fold curve 48 on both sides, and mountain-folded along the fifth auxiliary fold curve 49 on both sides. do. Then, since the shearing force and the tensile force along the fractured portion 45 act on the side plate 13, the side plate 13 can be reliably broken along the fractured portion 45.

(Opening work of packaging box)
When opening the sealed packaging box 10, for example, the outer flap 25 is operated to break the lid portion 20, and then the operation portion 40 is operated to break the side plate 13. However, the packaging box 10 may be opened by breaking the side plate 13 by operating the operation unit 40 and then breaking the lid 20 by operating the outer flap 25. Further, when only a part of the article is taken out from the packaging box 10, as shown in FIG. 6, only one of the pair of lids 20.20 may be opened. That is, the user puts the package in an opened state as needed, but according to the packaging box 10 of the present embodiment, the packaging box 20 can be smoothly broken regardless of the mode of opening.

(Second Embodiment)
8 to 10 show the packaging box 10 of the second embodiment. In this second embodiment, both the top plate 15 side and the bottom plate 14 side of the lid portion 20 can be opened without providing the side plate 13 with a breaking structure. Specifically, the inner flap 21 is provided with a first fracture portion 30 extending linearly in the Y direction in the center of the Z direction, and a second fracture portion 30 extending from above to below the first fracture portion 30 on the folding curve 22. A portion 32 is provided. Further, the lower outer flap 23 is provided with a first auxiliary folding curve 36 and a second auxiliary folding curve 38, similarly to the upper outer flap 25.

As shown in FIGS. 8 and 9, the first fractured portion 30 is composed of a plurality of Y-shaped cutting lines. The bifurcated branch portion of the cutting line is formed on the side plate 13 side. As a whole, the first fracture portion 30 extends in a direction orthogonal to the folding curve 22. However, the first fractured portion 30 may be inclined with respect to the folding curve 22 as long as it is linear.

The second broken portion 32 is made of a single zipper similar to that of the first embodiment. In the first portion 32a located on the top plate 15 side of the first breaking portion 30, a second cutting line is provided at the lower end of the first cutting line extending along the folding curve 22. In the second portion 32b located on the bottom plate 14 side of the first fracture portion 30, a second cutting line is provided at the upper end of the first cutting line extending along the folding curve 22.

A pair of fold lines 34 are symmetrically provided on one inner flap 21 with the first breaking portion 30 as a reference line. These crease lines 34 are provided between the attachment portions 28A and 28B and the second break portion 32, and extend along the second break portion 32.

When opening the packaging box 10, for example, by operating the upper outer flap 25 as in the first embodiment, the top plate 15 side of the lid portion 20 is opened. After that, the lower outer flap 23 is operated to open the bottom plate 14 side of the lid portion 20. At this time, since the inner flaps 21 and 21 have already been broken along the first broken portion 30, the operation of the outer flap 23 breaks only along the second portion 32b that has not yet been broken.

By the opening operation, the outer flap 23 is mountain-folded along the first auxiliary folding curve 36 and valley-folded along the second auxiliary folding curve 38. As a result, the inner flap 21 folds along the crease line 34. Therefore, since the tensile force in the Y direction acts on the second portion 32b of the second breaking portion 32 as in the first portion 32a, the ridges of the side plate 13 and the inner flap 21 can be reliably broken. As a result, as shown in FIG. 10, the entire inner flap 21 can be broken with respect to the side plate 13, and one end of the outer peripheral portion 12 can be opened.

(Third Embodiment)
11 to 14 show the packaging box 60 of the third embodiment. As shown in FIG. 11, the packaging box 60 includes a square cylindrical outer peripheral portion 62, a lower lid portion 68 that closes the lower end opening of the outer peripheral portion 62, and an upper lid portion 74 that closes the upper end opening of the outer peripheral portion 62. It is a general-purpose case. In this third embodiment, the first breaking portion 30, the second breaking portion 32, the crease line 34, the first auxiliary folding curve 36, and the second auxiliary folding curve 38 are provided on the upper lid portion 74.

(Outline of packaging box)
In the following description, the direction in which the end plates 63 and 63 of the outer peripheral portion 62 face each other is referred to as the X direction, the direction in which the side plates 64 and 64 of the outer peripheral portion 62 face each other is referred to as the Y direction, and the lower lid portion 68 and the upper lid portion 74. The direction in which they face each other is called the Z direction. In the packaging box 60 of the present embodiment, the dimension in the X direction is formed longer than the dimension in the Y direction, but the dimension in the Y direction may be formed longer than the dimension in the X direction, and the dimensions in the X direction and Y are formed. The dimensions in the directions may be the same.

As shown in FIG. 11, the outer peripheral portion 62 includes a pair of end plates (first side plates) 63 and 63 and a pair of side plates (second side plates) 64 and 64. The end plates 63, 63 have substantially the same square shape in which the dimension in the Y direction is longer than the dimension in the Z direction. The side plates 64, 64 have the same square shape in which the dimension in the X direction is longer than the dimension in the Z direction. The side plates 64, 64 are bent relatively in the direction orthogonal to the end plates 63, 63.

Referring to FIG. 12, the end plate 63 and the side plate 64 are alternately arranged from the left side to the right side via a folding curve 66. The portion where the folding curve 66 is formed is the first side of the end plate 63. A sticking plate 65 is continuously provided on the side plate 64 located at the right end of FIG. 12 via a folding curve 66. The sticking plate 65 is stuck to the inner surface (back liner) of the end plate 63 located at the left end of FIG. 12 by the sticking portion 28. The folding curve 66 is composed of a general-purpose ruled line, and extends in the Z direction in the assembled state of FIG.

Referring to FIG. 11 together with FIG. 12, the lower lid portion 68 and the upper lid portion 74 have the same square shape in which the dimension in the X direction is longer than the dimension in the Y direction.

The lower lid portion 68 includes a pair of inner flaps 69 and 69 and a pair of outer flaps 71 and 71. The inner flaps 69 and 69 have substantially the same square shape, and are connected to the lower side of the end plates 63 and 63 via the folding curves 70 and 70 made of general-purpose ruled lines. The outer flaps 71 and 71 have substantially the same square shape, and are connected to the lower sides of the side plates 64 and 64 via the folding curves 72 and 72 composed of general-purpose ruled lines.

The upper lid portion 74 includes a pair of inner flaps 75 and 75 and a pair of outer flaps 77 and 77. The inner flaps 75 and 75 have substantially the same square shape, and are continuously provided on the upper side (second side) of the end plates 63 and 63 via the folding curves 76 and 76 composed of general-purpose ruled lines. The outer flaps 77 and 77 have substantially the same square shape, and are connected to the upper side (third side) of the side plates 64 and 64 via the folding curves 78 and 78 composed of general-purpose ruled lines.

The inner flaps 69 and 75 are bent relative to the end plate 63 in the same direction as the side plate 64. The outer flaps 71 and 77 are bent relative to the side plate 64 in the same direction as the end plate 63. As a result, in the lower lid portion 68, the outer flaps 71 and 71 overlap the outer surfaces of the inner flaps 69 and 69, and these overlapping portions are attached by the attachment portions 28 and 28. In the upper lid portion 74, the outer flaps 77, 77 overlap the outer surfaces of the inner flaps 75, 75, and these overlapping portions are attached by the attachment portions 28, 28.

(Break structure of upper lid)
As shown in FIGS. 11 and 12, the upper lid portion 74 is provided with a first breaking portion 30, a second breaking portion 32, and a crease line 34 for breaking the inner flap 75.

The first break portion 30 is provided on the inner flap 75 so as to be located substantially at the tip of the outer flap 77. The first break portion 30 is composed of a single zipper and extends linearly in the X direction so as to intersect the opening operation direction (rightward in the Y direction) of the outer flap 77.

The second breaking portion 32 is provided on the folding curve 76 (second side) at the end of the end plate 63 so as to extend in the operating direction of the outer flap 77. The second fractured portion 32 includes a first portion 32a and a second portion 32b located on both sides in the Y direction with the first fractured portion 30 interposed therebetween, as in the second embodiment. The second breaking portion 32 is composed of a single zipper, the first cutting line is provided on the folding curve 76, and the second cutting line is provided at the end of the first cutting line on the first breaking portion 30 side.

The crease line 34 is provided on the inner flap 75 so as to be located between the attachment portions 28 and 28 and the second break portion 32, respectively, and extends along the second break portion 32. The crease line 34 is composed of a general-purpose ruled line, and is inclined from the first breaking portion 30 side toward the side plate 64 side, from the sticking portions 28, 28 side to the end plate 63 side, and in a direction approaching the end plate 63.

One of the pair of outer flaps 77 and 77 is gripped, and as shown in FIG. 13, the outer flaps 77 are operated toward the continuous side plates 64. Then, the operating force on the outer flap 77 is transmitted to the inner flaps 75 and 75 via the sticking portion 28, and the inner flaps 75 and 75 are broken along the first breaking portion 30.

When the outer flap 77 is subsequently operated after the fracture of the inner flap 75 along the first fracture portion 30 is completed, the inner flap 75 is mountain-folded along the crease line 34. As a result, a tensile force in the X direction toward the center of the upper lid portion 74 that intersects the second fractured portion 32 acts on the second fractured portion 32. Further, by setting the inclination direction of the crease line 34, the displacement (tensile force) of the inner flap 75 in the X direction at the center in the Y direction becomes large. Therefore, as shown in FIG. 14, following the fracture along the first fracture portion 30, the ridge portion between the end plate 63 and the inner flap 75 is ensured along the second fracture portion 32 (first portion 32a). Can be broken.

Further, when the opening of one of the pair of outer flaps 77 and 77 is completed, the other is gripped and the opening operation is performed. As a result, the remaining inner flap 75 can be broken along the second breaking portion 32 (second portion 32b). Therefore, the entire upper end of the outer peripheral portion 62 can be opened.

(Auxiliary structure for breaking the lid)
As shown in FIGS. 11 and 12, one of the pair of outer flaps 77, 77 has an opening operation portion 80 and an auxiliary folding curve 36 for assisting the break along the break portions 30, 32. , 38 are provided.

The operation unit 80 is for gripping the outer flap 77 in a sealed state, and is provided at the center of the tip of the outer flap 77. The operating portion 80 is defined by the tip of the outer flap 77, the folding curve 81, and a pair of breaking lines 82, 82.

The folding curve 81 is composed of a general-purpose ruled line and extends in the X direction along the tip of the outer flap 77. The break line 82 is composed of two or more cutting lines formed at intervals, extends in an arc shape from the end of the folding curve 81 in the X direction to both sides, and is provided over the tip of the outer flap 77.

The first auxiliary folding curve 36 extends in the Y direction from the operating portion 80 located between the pair of inner flaps 75, 75 toward the side plate 64 on which the outer flaps 77 are continuous. The first auxiliary folding curve 36 is composed of a general-purpose ruled line and is inclined outward in the X direction. However, the first auxiliary folding curve 36 may be formed parallel to the folding curve 76.

The second auxiliary folding curve 38 is provided on the outside of the outer flap 77 in the X direction. The second auxiliary folding curve 38 is composed of a pair of general-purpose ruled lines extending in parallel with a gap approximately equal to the wall thickness of the corrugated cardboard sheet. The second auxiliary fold curve 38 is located between the attachment portion 28 and the fold curve 78, and is inclined with respect to the fold curve 78 so as to intersect the fold line 34.

As shown in FIG. 13, when the operation unit 80 is opened and the outer flap 77 is operated, the outer flap 77 is mountain-folded along the first auxiliary folding curve 36 and the pair of second auxiliary folding curves 38, 38. Fold along the valley. Then, since a shearing force and a tensile force act on the inner flap 75 along the first breaking portion 30, the inner flap 75 can be reliably broken along the first breaking portion 30.

After the inner flap 75 is broken along the first fracture portion 30, the inner flap 75 is mountain-folded along the crease line 34 due to the valley fold of the outer flap 77 along the second auxiliary folding curve 38, and the inner flap 75 is broken. The amount of displacement of is large. Therefore, the fracture of the ridge portion between the end plate 63 and the inner flap 75 along the second fracture portion 32 is promoted, so that the fracture workability of the inner flap 75 can be improved.

As described above, the packaging box 60 of the third embodiment is a general-purpose case, but as in the first embodiment, the inner flap 75 is bent along the crease line 34 by the operation of the outer flap 77. Then, it is possible to break along the second broken portion 32 after breaking along the first broken portion 30 without peeling the outer flap 77 from the attached portion 28. Therefore, the openability of the packaging box 60 can be improved.

(Fourth Embodiment)
15 to 17 show the packaging box 60 of the fourth embodiment. As shown in FIG. 15, this packaging box 60 is a general-purpose case similar to the third embodiment, and the total height in the Z direction is higher than that of the third embodiment. Further, as shown in FIG. 17, in the packaging box 60 of the fourth embodiment, only one of the pair of outer flaps 77 and 77 can be opened, and a part of the outer peripheral portion 62 can also be opened together. This is different from the third embodiment.

Specifically, as shown in FIGS. 15 and 16, the first break portion 30 and the crease line 34 are provided on the inner flap 75 as in the third embodiment. Further, the first auxiliary folding curve 36 is also provided on the outer flap 77 as in the third embodiment. The second auxiliary folding curve 38 is different from the third embodiment in that it is composed of one lead ruled line. The lead ruled line is a general-purpose ruled line in which cutting lines are provided at predetermined intervals. The operation unit 80 is different from the third embodiment in that the operation unit 80 is opened from the beginning by punching.

Then, in the packaging box 60 of the fourth embodiment, the second breaking portion 32 is provided on the end plate 63 (first side plate). Further, the packaging box 60 of the fourth embodiment is provided with a third breaking portion 85, a notch wire 86, and a hinge wire 87.

The second fractured portion 32 is provided on each of the end plates 63 and 63 so as to be located at a distance from the folding curve 76 (second side). The second fractured portion 32 has a structure in which cutting lines are provided at predetermined intervals so as to form a perforation, and extends parallel to the folding curve 76. One end of the second fractured portion 32 in the Y direction corresponds to the formation position of the first fractured portion 30, and the other end of the second fractured portion 32 in the Y direction is located on the folding curve 66. However, the other end of the second fractured portion 32 may be formed at intervals with respect to the folding curve 66.

The third fractured portion 85 connects the first fractured portion 30 formed on the inner flap 75 and the second fractured portion 32 formed on the end plate 63, and is provided on the end plate 63. The third fractured portion 85 has a structure in which cutting lines are provided at predetermined intervals so as to form a perforation, and extends in the Z direction along the folding curve 66. The third fractured portion 85 and the first fractured portion 30 may be formed so as to be continuous or may be formed at intervals, and the third fractured portion 85 may be formed following the fracture along the first fractured portion 30. Any mode may be used as long as it is broken along the line. The third fractured portion 85 and the second fractured portion 32 may also be formed so as to be continuous or may be formed at intervals, and the second fractured portion 32 may be formed following the fracture along the third fractured portion 85. Any mode may be used as long as it is broken along the line.

Like the cutting line, the cutting line 86 is formed by inserting a blade from the back liner to the front liner, and is provided on the side plate 64 so as to extend inward in the X direction from the folding curve 66. The cut line 86 and the second fractured portion 32 may be formed so as to be continuous or may be formed at intervals. The total length of the cut line 86 is preferably as short as possible if it is possible to prevent the side plate 64 from being torn due to the opening of the upper lid portion 74.

The hinge wire 87 is composed of a general-purpose ruled line, and extends in the X direction from the inner end of one of the pair of cut lines 86, 86 to the inner end of the other. The hinge wire 87 is formed in a wavy shape that repeats arcuate irregularities, but may be formed in a straight line. Further, both ends of the hinge wire 87 are provided with an auxiliary fold curve 88 which is composed of a general-purpose ruled line and extends toward the end of the fold curve 78 between the side plate 64 and the outer flap 77.

When opening the packaging box 60, a hand is inserted from the operation unit 80 to operate the outer flap 77 toward the side plate 64. As a result, the inner flap 75 can be broken along the first breaking portion 30 as in the third embodiment. This break is facilitated by the bending of the inner flap 75 along the crease line 34 and the bending of the outer flap 77 along the first auxiliary folding curve 36 and the second auxiliary folding curve 38.

When the operation of the outer flap 77 is continued after the inner flap 75 is completely broken, the end plate 63 is subsequently broken in the Z direction along the third broken portion 85, and then the end is subsequently broken along the second broken portion 32. The plate 63 is broken in the Y direction. Then, when the breakage of the end plate 63 is completed, the breakage stops at the cut line 86, and as shown in FIG. 17, the side plate 64 can be bent along the hinge line 87.

As described above, the second fractured portion 32 is not limited to the configuration provided on the ridge portion of the end plate 63 (side plate 13 of the first embodiment) and the inner flap 75 (inner flap 21 of the second embodiment), and is not limited to the ridge portion. It may be formed at intervals. Then, by operating the outer flap 77 (outer flap 25 of the first embodiment), a part of the outer peripheral portion 62 (outer peripheral portion 12 of the first embodiment) may be broken together in an opened state. By doing so, the area of the opened portion can be increased, so that the workability of taking out the internal articles can be improved.

(Fifth Embodiment)
FIG. 18 shows the packaging box 10 of the fifth embodiment. The packaging box 10 is a wraparound case similar to the first embodiment, and has no second break portion for breaking the inner flap 21 or the side plate 13, and a break portion for breaking the side plate 13. Is not provided, which is different from the first embodiment.

In the packaging box 10, when the outer flap 25 is operated, the inner flap 21 is broken in the Y direction along the first breaking portion 30 as in the first embodiment. After that, when the operation of the outer flap 25 is continued, the inclination of the second portion 30b and the bending of the inner flap 21 along the crease line 34 subsequently cause the inner flap 21 and the ridge portion of the side plate 13 (the second side of the side plate 13). ) Is broken. As a result, the packaging box 10 can be opened as shown in FIG.

In the fifth embodiment, since the second breaking portion is not provided, the breaking edge between the inner flap 21 and the side plate 13 has an irregular shape, but the decrease in rigidity of the packaging box 10 can be suppressed. Further, since the bottom plate 14 side of the lid portion 20 remains closed, it is effective when only a part of the articles are taken out from the inside of the packaging box 10.

(Sixth Embodiment)
19 to 25 show the packaging box 10 of the sixth embodiment. The packaging box 10 is a wraparound case similar to that of the first embodiment, and the distance between the bottom plate 14 and the top plate 15 (height in the Z direction) is different from that of the packaging box 10 of the first embodiment. Further, as shown in FIG. 19, in the packaging box 10, the crease line 34 of the inner flap 21 is provided on the front side (upper side) of the attachment portion 28B in the opening operation direction (Z direction upward) of the outer flap 25. , The most different from the first embodiment. The side plate 13 is not provided with a breaking portion 45 for breaking the side plate 13.

With reference to FIG. 21, the outer peripheral portion 12 of the present embodiment is continuously provided from the upper side to the lower side in the order of the side plate 13, the top plate 15, the side plate 13, the bottom plate 14, and the sticking plate 16 via the folding curve 17. Has been done. The inner flap 21 constituting the lid portion 20 is connected to the side plate 13 via the folding curve 22, and the outer flaps 23 and 25 are connected to the bottom plate 14 and the top plate 15 via the folding curves 24 and 26. There is.

(Break structure of lid)
As shown in FIGS. 19 to 21, the packaging box 10 has a first breaking portion 30, a second breaking portion 32, and a crease line 34 for breaking the inner flap 21 in order to open the lid portion 20. It is provided.

The first break portion 30 is provided on the inner flap 21 so as to be located between the attachment portions 28A and 28B, and extends in the Y direction so as to intersect the operation direction (upward in the Z direction) of the outer flap 25. The first fractured portion 30 is provided at a position biased toward the bottom plate 14 side from the center of the inner flap 21 in the Z direction.

More specifically, the first fractured portion 30 is composed of a plurality of cutting lines extending in a perforated manner at intervals in the Y direction. At the tip of the inner flap 21, a notch 90 continuous with the first fractured portion 30 is provided. In the present embodiment, the end of the first fractured portion 30 located on the tip end side of the inner flap 21 is continuous with the notch 90, and the end of the first fractured portion 30 located on the side plate 13 side is located on the folding curve 22. However, they may be provided at intervals.

The second breaking portion 32 is provided on the folding curve 22 (second side) at the end of the side plate 13 so as to extend in the operating direction of the outer flap 25. The second fracture portion 32 is composed of a plurality of cutting lines extending in a perforated manner at intervals in the Z direction. The end of the second fractured portion 32 on the bottom plate 14 side extends toward the bottom plate 14 side from the first fractured portion 30 and is located at a distance from the bottom plate 14. The end of the second fractured portion 32 on the top plate 15 side extends substantially to the height of the sticking portion 28B and is located at a distance from the top plate 15.

The crease line 34 assists the breakage of the inner flap 21 along the first break portion 30 and the breakage of the inner flap 21 along the second break portion 32, and the fold line 34 is used to fold the attachment portion 28B and the top plate 15. It is provided on the inner flap 21 so as to be located between the curves (third side) 26. The fold line 34 is composed of a reverse ruled line, extends along the fold curve 26, and is inclined downward from the tip of the inner flap 21 toward the side plate 13 toward the attachment portion 28B (bottom plate 14).

The inner end of the crease line 34 located on the tip side of the inner flap 21 in the Y direction substantially coincides with the inner end of the attachment portion 28B in the Y direction, and the tip of the inner flap 21 and the top plate 15 side. It is located at a distance from the edge of the inner flap 21 of the. The outer end of the crease line 34 located on the side plate 13 side in the Y direction extends closer to the side plate 13 than the outer end of the attachment portion 28B, and is spaced from the fold curve 22 of the side plate 13 (for example, 15 mm or more). To position. The crease line 34 is preferably formed as long as possible inward in the Y direction, starting from the outer end in the Y direction.

The center of the tip of the outer flap 25 is gripped, and as shown in FIG. 22, the outer flap 25 is operated toward the top plate 15. Then, the operating force on the outer flap 25 is transmitted to the inner flaps 21 and 21 via the attachment portion 28B, and the inner flap 21 is valley-folded along the crease line 34. Therefore, since a tensile force in the Z direction acts on the inner flap 21, the inner flap 21 can be broken along the first breaking portion 30. Further, in the present embodiment, since the tensile force is concentrated on the notch 90 provided in the inner flap 21, the inner flap 21 can be effectively broken along the first breaking portion 30.

When the outer flap 25 is subsequently operated after the fracture of the inner flap 21 along the first fracture portion 30 is completed, the valley fold of the inner flap 21 along the crease line 34 is promoted as shown in FIG. 23. As a result, a shearing force in the X direction acts on the second fractured portion 32. Further, in the present embodiment, the tensile force in the direction away from the side plate 13 also acts by setting the inclination angle of the crease line 34. Therefore, as shown in FIG. 24, following the fracture of the inner flap 21 along the first fracture portion 30, the ridge portion between the side plate 13 and the inner flap 21 can be reliably fractured along the second fracture portion 32. ..

By operating the outer flap 25 in this way, the inner flap 21 can be smoothly broken along the broken portions 30 and 32 without peeling the outer flap 25 from the sticking portion 28B. Therefore, the openability of the lid portion 20 including the inner flaps 21 and 21 and the outer flaps 23 and 25 can be improved.

Further, when the opening of the outer flap 25 is completed, the outer flap 23 on the bottom plate 14 side is also opened as needed. That is, as in the second embodiment, the outer flap 23 is operated toward the bottom plate 14, and the inner flap 21 and the ridge portion of the side plate 13 are broken along the rest of the second broken portion 32 and the folding curve 22. .. As a result, as shown in FIG. 25, the entire inner flap 21 is broken against the side plate 13, and one end of the outer peripheral portion 12 is opened.

(Auxiliary structure for breaking the lid)
As shown in FIGS. 19 to 21, the outer flap 25 has a pair of first auxiliary folding curves 36 and 36 and a pair of second auxiliary folding curves in order to assist the breaking along the fracture portions 30 and 32. 38 and 38 are provided. Among them, the first auxiliary folding curve 36 is provided in the same manner as in the first embodiment.

The second auxiliary fold curve 38 is provided only on the outer flap 25 where the fold line 34 is located, substantially in the same manner as in the first embodiment. That is, the second auxiliary folding curve 38 is composed of a reverse ruled line, is located between the folding curve 26 at the end of the top plate 15 and the sticking portion 28B, and extends along the folding curve 26. The inclination angles of the second auxiliary fold curve 38 and the crease line 34 are the same, and they extend in the same direction. Referring to FIG. 20, the second auxiliary fold curve 38 and the crease line 34 are provided so as to partially overlap each other when viewed in the direction facing the outer flap 25. Note that FIG. 20 is shown so that both the second auxiliary fold curve 38 and the crease line 34 can be recognized.

The inclination angle between the second auxiliary fold curve 38 and the crease line 34, that is, the angle formed by the fold curve (third side) 26 of the top plate 15 and the second auxiliary fold curve 38 and the crease line 34 is too large or too small. Is not preferable. If the inclination angle with respect to the folding curve 26 is made excessively small, the angle difference between the folding curve 26 and the folding curve 26 disappears, so that it becomes difficult for the outer flap 25 and the inner flap 21 to bend at the valley. If the inclination angle with respect to the folding curve 26 is excessively large, the fracture of the inner flap 21 along the first fracture portion 30 cannot be promoted. Therefore, in order to promote the fracture of the inner flap 21 along the first fracture portion 30 and the second fracture portion 32, the inclination angle of the second auxiliary fold curve 38 and the crease line 34 with respect to the fold curve 26 is 3 degrees or more and 60. It is necessary to set it in the range of degree or less, and it is preferable to set it in the range of 5 degrees or more and 45 degrees or less, and in this embodiment, it is set to 16 degrees.

As shown in FIG. 22, when the outer flap 25 is opened, the outer flap 25 folds along the central first auxiliary fold curve 36 and valleys along the second auxiliary fold curve 38 on the side plate 13 side. It breaks. The valley fold of the second auxiliary fold curve 38 promotes the valley fold of the inner flap 21 along the crease line 34 which partially coincides with the second auxiliary fold curve 38.

A shearing force acts on the first fractured portion 30 of the inner flap 21 due to the mountain fold of the outer flap 25 according to the first auxiliary folding curve 36. Further, the mountain fold of the outer flap 25 due to the second auxiliary folding curve 38 promotes the tensile force acting on the first fractured portion 30 of the inner flap 21. Then, since these forces together act on the first breaking portion 30, the inner flap 21 can be reliably broken along the first breaking portion 30.

After the inner flap 21 is broken along the first fracture portion 30, the valley fold of the outer flap 25 along the second auxiliary folding curve 38 promotes the valley fold of the inner flap 21 along the crease line 34. Therefore, since the fracture of the ridge portion between the side plate 13 and the inner flap 21 along the second fracture portion 32 is promoted, the fracture workability of the inner flap 21 by the operation of the outer flap 25 can be improved.

When opening the bottom plate 14 side, by operating the outer flap 23 toward the bottom plate 14, the outer flap 23 folds along the first auxiliary folding curve 36. Therefore, since a tensile force can be applied to the ridge portion between the side plate 13 and the inner flap 21, the ridge portion can be effectively broken.

As described above, in the packaging box 10 of the sixth embodiment, as in the first embodiment, the inner flaps along the first breaking portion 30 and the second breaking portion 32 are provided by the crease line 34 provided on the inner flap 21. 21 can be effectively broken. Therefore, the openability of the lid 20 of the packaging box 10 can be improved. Further, the configuration in which the fold line 34 is provided on the front side in the operating direction of the outer flap as in the sixth embodiment can be similarly applied to the packaging box (general-purpose case) 60 of the third embodiment, and has the same operation. And the effect can be obtained.

The packaging boxes 10 and 60 of the present invention are not limited to the configuration of the above embodiment, and various modifications can be made.

For example, the first fractured portion 30 may have a partially curved or inclined shape as in the first embodiment, or may be formed in a straight line as in the second embodiment. Further, the first fractured portion 30 may have a curved shape as a whole, or may be inclined at a predetermined angle with respect to the operating direction of the outer flap.

The second fractured portion 32 may have a shape in which a part of the first fracture line 30 side is curved or inclined, or the entire second fractured portion 32 may be curved or inclined. When the whole is curved or inclined, it is preferable to arrange one end of the second fractured portion 32 on the ridge line (second side) between the first side plate and the inner flap. Further, the second fractured portion 32 may be provided on the first side plate side or on the inner flap side at a distance from the ridgeline of the first side plate and the inner flap.

The fold line 34 may be composed of two or more general-purpose ruled lines or reverse ruled lines provided intermittently at intervals. Further, the fold line 34 may be composed of two or more general-purpose ruled lines or reverse ruled lines arranged side by side at predetermined intervals. Further, the crease line 34 may be composed of a general-purpose ruled line or a lead ruled line in which a cutting line is provided along the reverse ruled line. The crease line 34 may be partially curved or inclined, or may be entirely curved.

The first auxiliary folding curve 36 may be partially or wholly curved. Further, the second auxiliary folding curve 38 may also be partially or wholly curved. Further, the second auxiliary fold curve 38 may have a total length that intersects the fold line 34 in the assembled state. Further, the first auxiliary folding curve 36 and the second auxiliary folding curve 38 may also be formed by two or more ruled lines provided intermittently, may be formed by two or more ruled lines arranged side by side, or lead. It may be composed of ruled lines.

The first break portion 30 and the second break portion 32 are not limited to the one-sided zipper or the perforated break line, and may be composed of a half-cut line obtained by cutting half of the front liner side or the back liner side. Can be changed as needed.

The packaging box may have a chamfer plate between the first side plate and the second side plate, may have a chamfer plate between the first side plate and the inner flap, or may have a chamfer plate between the second side plate and the outer flap. May be provided with a chamfer plate. When a chamfer plate is formed between the first side plate and the inner flap, the first break portion may be provided up to the ridge portion of the inner flap and the chamfer plate, or may be provided up to the ridge portion of the side plate and the chamfer plate.

The inner flap and the outer flap are not limited to sticking with a heat-melted resin, and may be stuck with a vinyl acetate emulsion-based adhesive or with a double-sided tape to obtain a predetermined sticking force. If so, the means of sticking can be changed as needed.

Further, the material of the packaging box is not limited to the corrugated cardboard sheet made of paper, and may be a corrugated cardboard sheet made of resin. Further, the material of the packaging box is not limited to the corrugated cardboard sheet, and may be a single-layer thick paper or a resin sheet.

10 ... Packaging box 12 ... Outer circumference 13 ... Side plate (first side plate)
14 ... Bottom plate 15 ... Top plate (second side plate)
16 ... Adhesive plate 17 ... Folded curve (first side)
20 ... Cover 21 ... Inner flap 22 ... Folded curve (second side)
23 ... Outer flap 24 ... Folded curve 25 ... Outer flap 26 ... Folded curve (third side)
28, 28A, 28B ... Adhesion part 30 ... First break part 30a ... First part 30b ... Second part 32 ... Second break part 32a ... First part 32b ... Second part 34 ... Fold line 36 ... First auxiliary Fold curve 38 ... Second auxiliary fold curve 40 ... Operation unit 41 ... Fold curve 42 ... First break line 43 ... Second break line 45 ... Break part 45a ... First break line 45b ... Second break line 45c ... Third break Line 47 ... 3rd auxiliary folding curve 48 ... 4th auxiliary folding curve 49 ... 5th auxiliary folding curve 60 ... Packaging box 62 ... Outer circumference 63 ... End plate (1st side plate)
64 ... Side plate (second side plate)
65 ... Adhesive plate 66 ... Folded curve (first side)
68 ... Lower lid 69 ... Inner flap 70 ... Folded curve 71 ... Outer flap 72 ... Folded curve 74 ... Upper lid 75 ... Inner flap 76 ... Folded curve (second side)
77 ... Outer flap 78 ... Folded curve (third side)
80 ... Operation part 81 ... Fold curve 82 ... Break line 85 ... Third break part 86 ... Cut line 87 ... Hinge line 88 ... Auxiliary fold curve 90 ... Notch part

Claims (8)

1st side plate and
A second side plate that is connected to the first side of the first side plate and bent with respect to the first side plate, and
An inner flap that is connected to the second side of the first side plate that intersects the first side and is bent in the same direction as the second side plate with respect to the first side plate.
An outer flap that is connected to the third side of the second side plate that intersects the second side of the first side plate and is bent so as to overlap the outer surface of the inner flap.
The inner flap and the attachment portion to which a part of the outer flap is attached are provided.
A first fractured portion provided on the inner flap so as to be located closer to the tip end side of the outer flap than the attachment portion and extending in a direction intersecting the second side of the first side plate.
A second fractured portion provided on the inner flap or the first side plate, extending along the second side of the first side plate, and fractured after the inner flap is fractured along the first fractured portion.
The inner flap is provided so as to be located between the sticking portion and the second fractured portion, and includes a crease line extending along the second fractured portion and assisting the fracture of the second fractured portion. Packaging box. The packaging box according to claim 1, wherein the end of the first fractured portion on the first side plate side and the second fractured portion are located at intervals. The packaging box according to claim 1 or 2, wherein the crease line is inclined from the sticking portion side toward the first side plate side from the first breaking portion side toward the second side plate side. The packaging box according to any one of claims 1 to 3, wherein the second breaking portion is provided on the second side of the first side plate. The second fractured portion is provided on the first side plate so as to be located at a distance from the second side.
The packaging box according to any one of claims 1 to 3, wherein the first side plate is provided with a third broken portion connecting the first broken portion and the second broken portion. The packaging box according to any one of claims 1 to 5, wherein the outer flap is provided with an auxiliary folding curve extending from the center side of the tip of the outer flap to the second side plate side. Any of claims 1 to 6, wherein the outer flap is provided with an auxiliary folding curve located between the third side of the second side plate and the sticking portion and extending along the third side. The packaging box described in item 1. 1st side plate and
A second side plate that is connected to the first side of the first side plate and bent with respect to the first side plate, and
An inner flap that is connected to the second side of the first side plate that intersects the first side and is bent in the same direction as the second side plate with respect to the first side plate.
An outer flap that is connected to the third side of the second side plate that intersects the second side of the first side plate and is bent so as to overlap the outer surface of the inner flap.
The inner flap and the attachment portion to which a part of the outer flap is attached are provided.
A fractured portion provided on the inner flap so as to be located closer to the tip end side of the outer flap than the attachment portion and extending in a direction intersecting the second side of the first side plate.
The inner flap is provided so as to be located between the sticking portion and the second side of the first side plate, extends along the second side, and follows the second side after the fractured portion is broken. A packaging box with creases to assist in breaking.

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