JP2023040891A - Packing box - Google Patents

Abstract

To provide a packing box that is easy to advance breaking along a break guide line and enables good opening workability.SOLUTION: A packing box 1 includes: a bottom plate 11; a pair of right and left side plates 13 and 14 that continue to the right and left edges of the bottom plate 11; a top plate 12 that continues to the upper edge part of the side plate 14; and a pair of front and back end plates 20 and 30. Both of the end plates 20 and 30 include: an opening part 50 that is opened by a break starting part 5 that becomes the original point when opening; and break support rule marks L40 and L40 that are formed to be axially symmetry to each other with respect to a base line X1 that runs vertically on the break starting part 5. The break support rule marks L40 and L40 are formed over the end plate 20 on the front side, the top plate 12, and the end plate 30 on the rear side.SELECTED DRAWING: Figure 1

Description

The present invention relates to packaging boxes.

2. Description of the Related Art Conventionally, there is known a packaging box that is used as a transport box for transporting goods and also used when displaying goods at a store (for example, see Patent Document 1).
The packaging box of Patent Literature 1 is made of corrugated cardboard, and the product can be displayed as it is only by separating a part of the top plate and the end plate from the sealed state and opening a part of the packaging box.

Japanese Utility Model Laid-Open No. 60-157611

In the conventional packaging box described above, the opening is opened by breaking the break guide line such as the perforation. There was a problem that it was bad.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described problems and to provide a packaging box that facilitates breakage along a breakage guide line and that is easy to open.

In order to solve the above-mentioned problems, the present invention provides a bottom plate, a pair of left and right side plates connected to the left and right edges of the bottom plate, and a top plate connected to the upper edge of one of the side plates. and end plates. The end plates each include an unsealing portion that is opened by a rupture starting portion that serves as a starting point for unsealing, and a rupture support ruled line that is symmetrical with respect to a reference line passing through the rupture starting portion in the vertical direction. ing. The break support ruled line is formed across the front end plate, the top plate and the rear end plate.

In the packaging box of the present invention, when the unsealable portion is lifted with fingers starting from the breakage initiation portion, the end plate is bent at the breakage support ruled line, and the progress of breakage follows the breakage guide line. As a result, the unsealing portion can be cut open smoothly. Further, when the fracture progresses from the end plate to the top plate, the top plate bends at the fracture support ruled line, and the fracture progresses smoothly from the end plate toward the top plate. Thereby, the end plate and the top plate can be cut open smoothly. Therefore, the unsealing work can be easily performed.

Moreover, it is preferable that a fracture guide wire is connected to the fracture initiation portion.

With this configuration, the break progresses along the break guide line, so the unsealable portion can be cut open smoothly.

Moreover, it is preferable that the top plate is formed with a folding ruled line perpendicular to the upper edges of the side plates.

With this configuration, when the top plate is opened up to the folding crease, the top plate can be used as a lid.

Moreover, it is preferable that the breaking support ruled line has a parabolic shape.
By configuring in this way, the strength of the packaging box can be improved as compared with the case where the breaking support ruled line is formed in a straight line.

The packaging box of the present invention is easy to break along the break guide line, and is easy to open.

BRIEF DESCRIPTION OF THE DRAWINGS It is the perspective view which showed the packaging box which concerns on 1st Embodiment of this invention. It is the figure which showed the blank sheet of the packaging box which concerns on 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the front view which showed the packaging box which concerns on 1st Embodiment of this invention. It is a rear view showing a packaging box concerning a 1st embodiment of the present invention. It is a left side view showing a packaging box concerning a 1st embodiment of the present invention. It is the perspective view which showed the mode at the time of opening the packaging box which concerns on 1st Embodiment of this invention. FIG. 4 is a perspective view showing a state in which a lower flap is opened when the packaging box according to the first embodiment of the present invention is opened; Fig. 2 is a perspective view showing a state in which side flaps of the packaging box according to the first embodiment of the present invention are also opened; FIG. 3 is a perspective view showing a state in which the top plate and a part of the rear end plate of the packaging box according to the first embodiment of the present invention are also opened. It is the perspective view which showed the state which opened a part of top plate and rear end plate of the packaging box which concerns on 1st Embodiment of this invention from the rear side. It is the figure which showed the blank sheet of the packaging box which concerns on 2nd Embodiment of this invention. FIG. 11 is a perspective view showing a state of the packaging box according to the second embodiment of the present invention when it is opened;

Embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
In the following description, the front, rear, left, and right directions are set for convenience in describing the packaging box of each embodiment, and do not limit the configuration of the packaging box of the present invention. In addition, in each embodiment, the same code|symbol is attached|subjected to the same part and detailed description is abbreviate|omitted.

(First embodiment)
As shown in FIGS. 1 and 2, the packaging box 1 of the present embodiment is a wrap-around type box, and has a rectangular parallelepiped shape with a length in the front-rear direction longer than that in the left-right direction. The packaging box 1 includes a bottom plate 11 , a pair of front and rear end plates 20 and 30 , a pair of left and right side plates 13 and 14 , and a top plate 12 . As will be described later, the packaging box 1 is formed with an unsealing portion 50 (see FIG. 4) extending from the front end plate 20 to the front side of the top plate 12 to form an outlet for the contents. Moreover, the packaging box 1 can be opened in various forms, such as an opening form in which the entire front end plate 20 is opened, an opening form in which the entire top plate 12 is opened, and the like.

As shown in FIG. 2, the packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S1 obtained by cutting out a sheet made of corrugated board. The blank sheet S1 shown in FIG. 2 is arranged so that the outer surface side can be seen, but for convenience of explanation, each ruled line formed on the inner surface side is indicated by solid lines.
Each ruled line (folded line) of the blank sheet S1 is a linear groove (press ruled line) formed by pressing the surface of the blank sheet S1. Note that a notch (half-cut line or the like) may be formed in the ruled line. This makes it easier to fold the blank sheet S1 along the ruled lines.

The bottom plate 11 is a rectangular flat plate, as shown in FIG. A left side plate 13 is connected to the left edge of the bottom plate 11 via a ruled line, and a right side plate 14 is connected to the right edge of the bottom plate 11 via a ruled line.
The left side plate 13 and the right side plate 14 are the same rectangular flat plate and are formed perpendicular to the bottom plate 11 .

The top plate 12 is connected to the upper edge of the right side plate 14 via a ruled line. The top plate 12 is the same rectangular flat plate as the bottom plate 11 and is formed perpendicular to the right side plate 14 .
A joint piece 16 is connected to the left edge of the top plate 12 via a ruled line. The joint piece 16 is a strip-shaped plate formed along the left edge of the top plate 12 .

Upper fracture guide lines L12 and L12 are formed along the ruled lines on the left and right edges of the top plate 12 . The upper breaking guide lines L12, L12 are for separating the top plate 12 from the left side plate 13 and the right side plate 14 when the top plate 12 is unsealed. The upper breaking guide lines L12, L12 are perforated lines in which notches are intermittently formed. Note that the interval and shape of the cut are not limited.
The upper fracture guide lines L12, L12 of the present embodiment are formed to be connected to left fracture guide lines L13, L16, and right fracture guide lines L14 of the left side plate 13 and the right side plate 14, which will be described later.

A folding ruled line L45 functioning as a folding line is formed on the front side of the top plate 12 . The folding ruled line L45 is a linear groove (pressing rule) formed by pressing the inner surface. The folding ruled line L45 extends linearly so as to connect the front ends of the upper fracture guide lines L12, L12 (connecting portions between the left fracture guide line L13 and the right fracture guide line L14). parallel to the leading edge of the

A top plate opening portion 54 (see FIG. 4) is formed in the top plate 12 by a region defined by the folding ruled line L45 and the left edge, right edge and front edge of the top plate 12 . The top plate opening portion 54 constitutes a part of the opening portion 50 provided in the packaging box 1 . The unsealing portion 50 (top plate 12) can be unsealed using the folding ruled line L45 as a rotation axis, and the opening can be used as a lid that can be opened and closed.

The top plate 12 includes top plate front side support ruled lines L42, L42 forming part of a pair of left and right fracture support ruled lines L40, L40 described later, and top plate rear side support ruled lines L43, L43 continuing to these. The top plate front side support ruled lines L42, L42 and the top plate rear side support ruled lines L43, L43 extend in the front-rear direction of the top plate 12 in a curved line shape. The top plate front side support ruled lines L42, L42 are ruled lines extending from the front edge of the top plate 12 to the top plate 12 folding ruled line L45, continuing from the front side support ruled lines L41, L41 of the front end plate 20, which will be described later. The top plate rear support ruled lines L43, L43 are ruled lines that extend from the folding ruled line L45 to the rear edge of the top plate 12 continuously from the top plate front support ruled lines L42, L42.
Details of the breaking support ruled lines L40, L40 will be described later.

The left plate 13, the bottom plate 11, The right side plate 14 and the top plate 12 are formed in a square tube shape.

The front end plate 20 includes a pair of upper and lower outer flaps 21 and 22 connected to the front edges of the bottom plate 11 and the top plate 12, respectively, and left and right flaps connected to the front edges of the left side plate 13 and the right side plate 14, respectively. A pair of inner flaps 23 and 24 are provided.
The outer flaps 21 and 22 are overlaid on the outer surfaces of the inner flaps 23 and 24 and are integrally adhered with an adhesive.

The lower outer flap 21 is a substantially rectangular flat plate and extends upward from the front edge of the bottom plate 11 . The upper outer flap 22 is a generally rectangular flat plate that extends downwardly from the front edge of the top plate 12 .
The outer flaps 21 and 22 are arranged with a gap between the tip edges without abutting each other in the vertical direction. Finger hooking portions 5, 5 functioning as break start portions (portions that trigger opening) are formed at the left-right center portion of each tip edge. As shown in FIG. 2, the finger hook portion 5 has a substantially semicircular shape, and includes an arc-shaped ruled line L6, cuts L5 and L5, and an arc-shaped notch portion 5a. When a finger is inserted through the cutout portion 5a, each piece of the finger hooking portion 5 separated by the cuts L5 and L5 is mountain-folded along the ruled line L6 to open in a substantially semicircular shape. This makes it easy to put your finger on when opening the package.

A pair of left and right arcuate fracture guide lines L21, L21 are formed on the lower outer flap 21. As shown in FIG. The arc-shaped breaking guide lines L21, L21 are for separating the central portion 21a of the lower outer flap 21 from the inner flaps 23, 24 when the package is opened. The arcuate breaking guide lines L21, L21 are perforated lines in which notches are intermittently formed. Note that the interval and shape of the cut are not limited.

The arcuate fracture guide lines L21, L21 are each formed in an arcuate shape concave downward. The arc-shaped breaking guide lines L21, L21 extend toward the left and right lower corners of the lower outer flap 21 with the tip edges on the left and right sides of the finger hook portion 5 as base ends, and extend from the base ends. They are formed such that the distance between them increases toward the ends. In addition, the arc-shaped breaking guide lines L21, L21 extend so as to bypass the adhesion regions (not shown) between the outer flaps 21, 22 and the inner flaps 23, 24. As shown in FIG.

The left inner flap 23 is a substantially rectangular flat plate and extends rightward from the front edge of the left side plate 13 . The right inner flap 24 is a substantially rectangular flat plate extending leftward from the front edge of the right side plate 14 .
The inner flaps 23 and 24 are arranged with a gap between the left and right tip edges without abutting each other. As a result, a vertically extending slit-shaped gap is formed between the tip edges of the inner flaps 23 and 24 . This gap functions as an escape portion for the finger inserted into the finger hook portion 5. - 特許庁

The inner flaps 23, 24 are formed with fracture guide lines L23, L24 extending in the left-right direction. The rupture guide lines L23 and L24 are perforated lines in which notches are intermittently formed. Note that the interval and shape of the cut are not limited.

As shown in FIG. 3A, the left fracture guide line L23 extends obliquely upward to the left of the inner flap 23 with its base end at the center of the tip edge of the inner flap 23 in the vertical direction. up to. The right fracture guide line L24 has a symmetrical shape with the left fracture guide line L23, and extends obliquely upward to the right of the inner flap 23 with the base end at the center of the tip edge of the inner flap 24 in the vertical direction. 23 to the right edge. That is, the rupture guide lines L23 and L24 are inclined with respect to the tip edge of the upper outer flap 22. As shown in FIG.
Moreover, as shown in FIG. 3A, the breakage guide lines L23 and L24 overlap (are connected to) part of the finger hook portion 5 of the outer flap 22 on the upper side when viewed from the front. As a result, when the upper outer flap 22 is pulled up by inserting a finger into the finger hooking portion 5 at the time of opening, the force applied to the finger hooking portion 5 is guided to the left and right breaking guide lines L23 and L24.

In the front end plate 20, a front opening portion 51 (see FIG. 4) is formed by a region defined by the fracture guide lines L23 and L24, the upper edge of the upper outer flap 22, and the left and right edges of the upper outer flap 22. formed. The front opening part 51 constitutes a part of the opening part 50 provided in the packaging box 1 .

The front end plate 20 (upper outer flap 22) is formed with front support ruled lines L41, L41 forming parts of the breakage support ruled lines L40, L40. As shown in FIG. 3A, the front support ruled lines L41, L41 extend in a curved line shape from the left and right upper portions of the finger hook portion 5 of the upper outer flap 22 to the upper edge thereof.

As shown in FIG. 3B, the rear end plate 30 includes a pair of upper and lower outer flaps 31 and 32 connected to the rear edges of the bottom plate 11 and the top plate 12, respectively, and the rear edges of the left side plate 13 and the right side plate 14. A pair of left and right inner flaps 33 and 34 are provided in series with each of the parts.
The outer flaps 31, 32 are overlaid on the outer surfaces of the inner flaps 33, 34 and are integrally adhered with an adhesive.

The outer flaps 31 and 32 are arranged so that the tip edges thereof are spaced apart from each other without abutting each other in the vertical direction. A finger hook portion 5 similar to that of the front end plate 20 is formed in the center portion of the upper outer flap 32 in the left-right direction.
A pair of left and right arc-shaped fracture guide lines L32, L32 are formed on the upper outer flap 32. As shown in FIG. The arc-shaped breaking guide lines L32, L32 are for separating the central portion 32a of the upper outer flap 32 from the inner flaps 33, 34 when the top plate 12 is opened. The arcuate breaking guide lines L32, L32 are perforated lines in which notches are intermittently formed. Note that the interval and shape of the cut are not limited.

The arcuate breaking guide lines L32, L32 are each formed in an arcuate shape that protrudes upward. The arc-shaped breaking guide lines L32, L32 extend toward the left and right upper corners of the upper outer flap 32 with the tip edges on the left and right sides of the finger hook portion 5 as base ends, and extend from the base ends. They are formed such that the distance between them increases toward the ends. In addition, the arc-shaped breaking guide lines L32, L32 extend so as to bypass the adhesion regions (not shown) between the outer flaps 31, 32 and the inner flaps 33, 34. As shown in FIG.

The left and right inner flaps 33, 34 are similar to the inner flaps 23, 24 of the front end plate 20, except that they do not have the tear guide lines L23, L24 (see FIG. 3A).

As shown in FIG. 1, the left side plate 13 is formed with a left fracture guide line L13 functioning as a fracture guide line. Further, the joint piece 16 joined to the left side plate 13 is also formed with a left fracture guide line L16 functioning as a fracture guide line. As shown in FIG. 3C, the left fracture guide lines L13 and L16 are provided so as to substantially overlap each other when viewed from the left side. The left breaking guide lines L13 and L16 are, as shown in FIG. 2, perforated lines in which notches are intermittently formed. The interval and shape of the notch of the left fracture guide line L13 are not limited.
A left opening portion 52 (see FIG. 1) is formed in the left side plate 13 by a region defined by the left breaking guide lines L13 and L16 and the front edge and upper edge of the left side plate 13 (joint piece 16). . The left opening portion 52 forms part of the opening portion 50 .

As shown in FIG. 1, the left fracture guide lines L13 and L16 are formed from the upper edge of the left plate 13 (the upper fracture guide line L12 (front end of )) and extends rearward and obliquely upward.

As shown in FIG. 1, the right side plate 14 is formed with a right fracture guide line L14 that functions as a fracture guide line. The right fracture guide line L14 has a symmetrical shape with the left fracture guide line L13 of the left plate 13, and is a perforated line in which notches are intermittently formed similarly to the left fracture guide line L13.
As shown in FIG. 1 , the right fracture guide line L14 extends from the upper edge of the right plate 14 (the front end of the upper fracture guide line L12) starting from the portion continuing to the right end of the fracture guide line L24 of the front end plate 20. ) and extends rearward and obliquely upward.
A right opening portion 53 is formed in the right side plate 14 by a region defined by the right breaking guide line L14 and the front edge and upper edge of the right side plate 14 . The right opening portion 53 (see FIG. 1) forms part of the opening portion 50 .

The rear end plate 30 (upper outer flap 32) is formed with rear support ruled lines L44, L44 forming parts of the breakage support ruled lines L40, L40. As shown in FIG. 3B, the rear support ruled lines L44, L44 are continuous with the top plate front support ruled lines L42, L42, and have the base end at the upper edge of the upper outer flap 32, and the left and right upper parts of the finger hook 5 are curved. It extends in a curved line. The rear support ruled lines L44, L44 are symmetrical with the front support ruled lines L41, L41.

An opening portion 50 is formed in the front portion of the packaging box 1 by the front side opening portion 51, the left side opening portion 52, the right side opening portion 53, and the top plate opening portion 54 as described above. The opening portion 50 is cut and cut by each guiding wire to form a relatively large opening around the upper corner of the front portion of the packaging box 1, as shown in FIG. The opening is open toward the front of the front of the packaging box 1, the left and right sides of the front, and the upper side of the front.

As shown in FIG. 1, the front end plate 20, the top plate 12, and the rear end plate 30 are formed with a pair of left and right breaking support ruled lines L40, L40 extending across them. The breakage support ruled lines L40, L40 assist the progress of breakage along each breakage guide line when the packaging box 1 is opened, as will be described later. The breaking support ruled lines L40, L40 are formed on the inner surface of the blank sheet S1. Specifically, the rupture support ruled lines L40, L40 are linear grooves (press rulers) formed by pressing the inner surface. Therefore, the breaking support ruled lines L40, L40 do not appear on the outer surface of the packaging box 1. As shown in FIG.

As shown in FIG. 2, the fracture support ruled lines L40, L40 include front support ruled lines L41, L41, top plate front support ruled lines L42, L42, top plate rear support ruled lines L43, L43, and rear support ruled lines L44, L44. . Such breakage support ruled lines L40, L40 have a smooth parabolic shape. In the state of the blank sheet S1, the right breaking support ruled line L40 is a curved line convex to the right, and the left breaking supporting ruled line L40 is a curved line convex to the left.
The intersection of the fracture support ruled lines L40, L40 is positioned laterally (not shown) from the leading edge of the upper outer flap 22 of the front end plate 20, and the upper outer flap 32 of the rear end plate 30. located laterally (not shown) from the leading edge of the As a result, the rupture support ruled line L40 extends from the finger hook portion 5 side of the front end plate 20 toward the central portion of the top plate 12 in the front-rear direction, or from the finger hook portion 5 side of the rear end plate 30 toward the top plate 12 in the front-rear direction. The separation distance from the other fracture support ruled line L40 increases toward the center of the line L40.

As shown in FIGS. 1 and 2, the breaking support ruled lines L40, L40 extend to the upper edge of the finger hook portion 5 of the upper outer flap 22 from the left and right upper portions, cross the upper edge and extend to the top plate. 12 extending to the trailing edge. The breaking support ruled lines L40, L40 cross the rear edge of the top plate 12, extend to the upper outer flap 32, and reach the left and right upper portions of the finger hook portion 5. As shown in FIG. That is, the rupture support ruled lines L40, L40 cross the entire front-rear direction of the top plate 12 and extend from the top plate 12 to the front end plate 20 and the rear end plate 30. As shown in FIG.

When unsealing the packaging box 1 of this embodiment, an operator's finger is put into the finger hooking portion 5 of the front end plate 20 and the front opening portion 51 is pulled up. Then, as shown in FIG. 4, the rupture guide lines L23 and L24 are cut open to the left and right, and the left rupture guide line L13 and the right rupture guide line L14 are cut open. As a result, the top plate 12 is valley-folded along the ruled line L45, and the unsealing portion 50 is lifted up with the ruled line L45 as a rotation axis to open the opening.

When opening the front end plate 20 as a whole, as shown in FIG. pull it down. Then, the arc-shaped breaking guide lines L21, L21 are cut open, and the central portion 21a of the outer flap 21 is separated from the side edge portions 21b, 21b of the outer flap 21. As shown in FIG.
Thereafter, as shown in FIG. 6, the inner flaps 23, 24 are opened left and right. As a result, the entire front end plate 20 is unsealed.

When the entire top plate 12 is to be unsealed following the unsealing portion 50, the top plate 12 is cut along the upper breaking guide lines L12, L12, as shown in FIG. Further, the center portion 32a (see FIG. 3B) of the upper outer flap 32 of the rear end plate 30 is cut off continuously from the top plate 12. As shown in FIG. In this case, the cutting of the central portion 32a of the outer flap 32 may be performed by cutting open the arc-shaped fracture guide lines L32, L32 so as to tilt the top plate 12 rearward, or the finger hook portion of the outer flap 32. 5 may be pinched with fingers and the center portion 32a may be pulled upward to cut open the arc-shaped fracture guide lines L32, L32.

Furthermore, when opening the packaging box 1, it is also possible to cut open from the rear end plate 30 side to the top plate 12, as shown in FIG. In this case, similarly to the above, the finger hooking portion 5 of the outer flap 32 is pinched with fingers to cut the central portion 32a from the side edges 32b, 32b, and subsequently the top plate 12 is cut open so as to pull it forward. Thus, it can be opened from the rear end plate 30 side to the top plate 12 .

In the packaging box 1 of the present embodiment described above, when the unsealable portion 50 is lifted with fingers starting from the finger hook portion 5, the front end plate 20 (outer flap 22) is bent at the front support ruled lines L41, L41, and the break progresses. It follows the fracture guide lines L23 and L24. As a result, the opening portion 50 can be cut open smoothly. Therefore, the unsealing work can be easily performed.

Further, by the top plate front support ruled lines L42, L42 that are continuous with the front support ruled lines L41, L41, the fracture progresses from the fracture guide line L23 along the left fracture guide lines L13, L16, and from the fracture guide line L24 to the right fracture guide line. Since breakage progresses along L14, the opening portion 50 can be opened more smoothly.

In addition, when the fracture progresses from the front end plate 20 to the top plate 12 through the left and right side plates 13 and 14, the top plate rear support ruled lines L43 and L43 that are continuous with the top plate front support ruled lines L42 and L42 move from the left fracture guide lines L13 and L16. The fracture progresses along the upper fracture guide line L12, and the fracture progresses from the right fracture guide line L14 along the upper fracture guide line L12. Thereby, it can be smoothly unsealed from the unsealing part 50 to the top plate 12.例文帳に追加

Further, by opening the top plate 12 up to the folding ruled line L45, the top plate 12 (opening portion 50) can be used as a lid.

Moreover, since the rupture support ruled lines L40, L40 are parabolic, the strength of the packaging box 1 can be improved compared to the case where the rupture support ruled lines L40, L40 are formed linearly.

(Second embodiment)
The packaging box of the second embodiment will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 is a diagram showing a blank sheet of the packaging box according to the second embodiment of the present invention, and FIG. 10 is a perspective view showing the appearance of the packaging box according to the second embodiment of the present invention when opened. .
The packaging box 1A of this embodiment differs from the first embodiment in that the top plate 12 is entirely provided with upper fracture guide lines L12, L12, left fracture guide lines L13, L16, and right fracture guide lines L13, L16. The point is that the line L14 is not provided.

The top plate 12 is formed with upper fracture guide lines L12, L12 along the entire left edge and right edge. Correspondingly, the front end plate 20 is formed with a longitudinal breakage guide line L13a that connects the breakage guide line L23 and the left upper breakage guide line L12. Further, the front end plate 20 is formed with a longitudinal breakage guide line L14a that connects the breakage guide line L24 and the right upper breakage guide line L12.

The left vertical fracture guide line L13a is formed along the left edge of the inner flap 23 . On the other hand, the right vertical fracture guide line L14a is formed along the right edge of the inner flap 24. As shown in FIG.
In addition, each fracture start portion is simplified and has only the notch portion 5a.

When opening the packaging box 1 of the present embodiment, an operator puts his or her fingers into the notch 5a of the front end plate 20 and pulls up the front opening portion 51. As shown in FIG. Then, as shown in FIG. 10, the rupture guide lines L23 and L24 are cut left and right, and the vertical rupture guide lines L13a and L14a and the upper rupture guide lines L12 and L12 that are continuous with them are cut open. As a result, the top plate 12 is valley-folded along the ruled line L45, and the front side unsealing portion 51 and the top plate unsealing portion 54 are pulled up with the ruled line L45 as the axis of rotation to open the opening.

When opening the entire front end plate 20, when opening the entire top plate 12 following the top plate opening portion 54, and when opening from the rear end plate 30 side to the top plate 12, the first embodiment It is feasible as well as morphology.

In the packaging box 1A of this embodiment as well, the same effects as those of the first embodiment can be obtained.
The front support ruled lines L41, L41 and the top plate front support ruled lines L42, L42 are continuous from the front end plate 20 to the top plate 12. FIG. Therefore, the fracture progresses smoothly from the vertical fracture guide lines L13a and L14a to the upper fracture guide lines L12 and L12, and at the corners of the front end plate 20 and the top plate 12, the fracture deviates from the guide line and progresses. There is no danger that the Therefore, the unsealing work can be easily performed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the scope of the invention.
For example, in each of the above-described embodiments, the base ends of the front support ruled lines L41, L41 and the rear support ruled lines L44, L44 are set above the finger rest portion 5 and above the notch portion 5a, but are not limited to this. It may be the leading edge of the outer flaps 22 and 32 .

Moreover, although the present invention is applied to the wrap-around type packaging boxes 1 and 1A in each of the above-described embodiments, the present invention may be applied to the A-type packaging box.

Further, although the rupture support ruled lines L40, L40 are formed on the inner surfaces of the blank sheets S1, S2, they may be formed on the outer surfaces, or may be formed on both the inner and outer surfaces.

Further, although the breaking guide lines L23 and L24 are configured to overlap (connect to) a part of the finger hooking portion 5, they are not limited to this, and may be provided apart from the finger hooking portion 5. FIG.

Further, the breaking support ruled lines L40, L40 may be linear.

Although the packaging boxes 1 and 1A of the present embodiment are made of cardboard, the packaging boxes may be made of various known paperboards.

1 packaging box 1A packaging box 5 finger hooking part (break start part)
5a Notch 11 Bottom plate 12 Top plate 13 Left plate (side plate)
14 Right side plate (side plate)
16 Joining piece 20 Front end plate 30 Rear end plate 50 Unsealing part L40 Breaking support ruled line L23 Breaking guide line L24 Breaking guide line L45 Folding ruled line X1 Reference line

Claims (4)

a bottom plate;
a pair of left and right side plates connected to left and right edges of the bottom plate;
a top plate connected to the upper edge of one of the side plates;
A packaging box comprising a pair of front and rear end plates,
The end plates are
An unsealing portion that is unsealed by a fracture starting portion that serves as a starting point at the time of unsealing;
a fracture support ruled line formed line-symmetrically with respect to a reference line passing through the fracture start portion in the vertical direction;
The packaging box, wherein the breaking support ruled line is formed over the front end plate, the top plate, and the rear end plate. 2. The packaging box according to claim 1, wherein a breakage guide wire is connected to said breakage initiation portion. 3. The packaging box according to claim 1, wherein the top plate is formed with a folding ruled line perpendicular to the upper edges of the side plates. 4. The packaging box according to any one of claims 1 to 3, wherein the breaking support ruled line has a parabolic shape.

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