JP2022030568A - Packing box - Google Patents

Abstract

To provide a packing box capable of suppressing a trunk from being deformed by a load from above.SOLUTION: A packing box, comprising a trunk 2 made up surrounded by a plurality of side plates 11, 14 and a top-face flap 26, 28 provided continuing from each upper limb of the trunk 2, comprises a flap-ruled line 18 that is provided at each upper limb and allows the top-face flap to be bent, a leading ruled line 31 that adjoins the flap-ruled line 18 and extends in a same direction, and a break line 32 that is provided over an entire periphery of the trunk 2. At least opposed, one pair of side plates out of the side plates making up the trunk 2 comprise an opening-start portions 36a, 36d contiguous with the break line 32.SELECTED DRAWING: Figure 3

Description

The present invention relates to a packaging box having the functions of a transport box and a display box.

Inside the packaging box, there is a shelf ready package (SPR) that can be easily opened without using a cutter or the like and the products can be displayed at the store as it is. For example, the packaging box of Patent Document 1 includes a body portion having a pair of width surfaces and a pair of length surfaces, an inner flap connected to the upper edge of the width surface, an outer flap connected to the upper edge of the length surface, and the like. I have. Further, the body portion is provided with a break line continuously in the circumferential direction. On the length surface and the width surface surface constituting the body portion, an opening start portion (first operation unit, second operation unit) into which a hand such as a finger is inserted is provided at a position overlapping the break line.

This type of packaging box is opened by inserting a hand such as a finger into the opening start portion and pulling upward above the break line to expose the contained article. The lower part of the packaging box is then used as a tray for displaying the goods.

International Publication No. 2018/235789

By the way, when the packaging boxes are stacked during transportation or the like, the load of the packaging boxes stacked on the upper side is applied to the packaging box located on the lower side, so that the portion of the break line having low strength moves outward. It deforms to swell.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a packaging box capable of suppressing deformation of the body portion due to a load from above.

The packaging box for solving the above-mentioned problems is a packaging box including a body portion surrounded by a plurality of side plates and a top surface flap connected to each upper side of the body portion for forming the top surface. In the flap ruled line provided on each upper side of the body portion and allowing the top flap to be bent, the guide ruled line extending in the same direction close to the flap ruled line, and the entire circumference of the body portion. It is provided with a ruled line provided over.

According to the above configuration, even if a load is applied from above, the side plate is bent inward by the guide ruled line to form a step-crushed portion, and the load is preferentially supported by the step-crushed portion. As a result, the packaging box can suppress deformation that swells outward at the position of the break line.

In the packaging box, at least a pair of side plates facing each other among the side plates constituting the body portion may be configured to have an opening start portion in contact with the break line. According to the above configuration, it is possible to put a hand such as a finger in the hand hole and continuously cut the break line.

In the packaging box, the opening start portion includes an upper side and a lower side, and the upper side is a part of the breaking line and has a convex shape inclined downward from the apex toward both sides. May be configured to incline upward from both ends of the upper side. According to the above configuration, when a hand such as a finger is put in the hand hole portion and the breaking line is continuously cut, the breaking is further facilitated.

In the packaging box, a notch may be provided between the upper side and the lower side of the opening start portion. According to the above configuration, the opening start portion can be opened by opening both sides with the notch as a boundary.

In the packaging box, the lower side of the opening start portion may be formed by a bendable ruled line extending from the intersection with the notch to both ends of the opening start portion. According to the above configuration, the piece blocking the opening start portion can be folded inward through the ruled line.

In the packaging box, the side plate having the opening start portion is configured to be provided with a pair of opening auxiliary ruled lines extending from the vicinity of both ends of the opening start portion toward both corners on the top surface side. May be good. According to the above configuration, the side plate is bent by the opening auxiliary ruled line, so that the breaking line is easily broken.

In the packaging box, the guide ruled line includes a parallel portion parallel to the flap ruled line and an inclined portion connecting the end portion of the parallel portion and the end portion of the flap ruled line on each upper side of the body portion. It may be configured. According to the above configuration, since the inclined portion connects the end portion of the parallel portion and the end portion of the top flap ruled line, the step collapsed portion is likely to be formed by the load from above.

According to the present invention, it is possible to suppress deformation of the body portion due to a load from above.

The perspective view of the packaging box in 1st Embodiment seen from the upper side. The development view of the packaging box in 1st Embodiment. The perspective view which shows the state in which the packaging boxes are stacked in 1st Embodiment. The perspective view which shows the opening method of the packaging box in 1st Embodiment. A perspective view of the packaging box in the second embodiment as viewed from above. The development view of the packaging box in 2nd Embodiment. The perspective view which shows the state in which the packaging boxes are piled up in 2nd Embodiment.

Hereinafter, the packaging box to which the present invention is applied will be described with reference to the drawings.
<First Embodiment>
As shown in FIG. 1, the packaging box 1 to which the present invention is applied is a packaging box used not only as a transport box used for transporting goods, but also when displaying goods at a store. The packaging box 1 includes a body portion 2, and a product is housed in the body portion 2. The body portion 2 is an upper half body 3 having a continuous breaking line 32 extending in the circumferential direction (hereinafter, also referred to as a lateral direction), and the upper side of the breaking line 32 is cut off, and is below the breaking line. The side is the lower body 4 used as a tray when displaying products. By removing the upper half of the packaging box 1, the goods as inclusions arranged in the lower half of the box 4 are exposed.

As shown in FIG. 2, the body portion 2 includes a first side plate 11, a second side plate 12, a third side plate 13, and a fourth side plate 14 in a deployed state. The first side plate 11 and the third side plate 13 form a length surface in the body portion 2, and the second side plate 12 and the fourth side plate 14 form a width surface in the body portion 2. A vertical ruled line 15 is provided between the first side plate 11 and the second side plate 12, between the second side plate 12 and the third side plate 13, and between the third side plate 13 and the fourth side plate 14. .. Further, the first side plate 11 includes a joining piece 16 for joining the fourth side plate 14 via the vertical ruled line 15.

The lower side of the first side plate 11 is provided with the bottom outer flap 21 via the bottom flap ruled line 17, and the lower side of the second side plate 12 is provided with the bottom inner flap 22 via the bottom flap ruled line 17, and the lower side of the third side plate 13 is provided. The bottom flap outer flap 23 is provided via the bottom flap ruled line 17, and the fourth side plate 14 is provided with the bottom inner flap 24 via the bottom flap ruled line 17. The bottom outer flaps 21 and 23 are butt flaps. For the bottom surface, the bottom inner flaps 22 and 24 are bent inward via the bottom flap ruled line 17, and then the bottom surface outer flaps 21 and 23 are bent inward via the bottom flap ruled line 17. The bottom surface is formed by abutting the bottom outer flaps 21 and 23. The bottom outer flaps 21 and 23 are joined by a joining means such as an adhesive tape or a staple.

The bottom surface is not limited to such a configuration. For example, the bottom surface is configured by providing engaging portions on the four flaps constituting the bottom surface and engaging these engaging portions with each other. May be good.

The upper side of the first side plate 11 is provided with the outer flap 26 via the top flap ruled line 18, and the upper side of the second side plate 12 is provided with the inner flap 27 via the top flap ruled line 18. The upper side of the side plate 13 is provided with an outer flap 28 via a top flap ruled line 18, and the fourth side plate 14 is provided with an in-top flap 29 via a top flap ruled line 18. The outer flaps 26 and 28 are butt flaps. For the top surface, the inner surface flaps 27 and 29 are bent inward via the top surface flap ruled line 18, and then the top surface outer flaps 26 and 28 are bent inward via the top surface flap ruled line 18. The top surface is formed by abutting the flaps 26 and 28 outside the top surface. The outer flaps 26 and 28 are joined by a joining means such as an adhesive tape or a staple. The joint piece 16 also overlaps with the top surface outer flap 26 in the vertical direction, and the top surface flap ruled line 18 also extends to the joint piece 16.

The tips of the flaps 27 and 29 in the top surface are separated from each other to form a gap when the flaps 27 and 29 are bent inward. The tip end portion of the top surface outer flap 28 located on the gap is provided with a hand hole portion 28a that serves as a hand hole when opening the top surface. The hand hole portion 28a is composed of two notches provided from the tip edge toward the top flap ruled line 18 and a ruled line provided between the two notches. The hand hole portion 28a becomes a hand hole when the area surrounded by the notch and the ruled line is pressed by a hand such as a finger and folded inward from the ruled line. The hand hole portion 28a may be provided on the outer surface flap 26, or may be provided on both the outer surface flaps 26 and 28. Further, the hand hole portion 28a may be a hole formed in advance.

The first side plate 11 to the fourth side plate 14 include a guide ruled line 31 extending in the same direction in the vicinity of the top flap ruled line 18. The guide ruled line 31 is provided between the top flap ruled line 18 and the break line 32. Specifically, the guide ruled line 31 is provided closer to the top flap ruled line 18 than the break line 32. The guide ruled line 31 also extends to the joint piece 16, but the guide ruled line 31 of the joint piece 16 overlaps with the guide ruled line 31 of the fourth side plate 14.

The first side plate 11 to the fourth side plate 14 have a breaking line 32 arranged side by side in the horizontal direction below the guide ruled line 31 at a substantially central portion in the vertical direction of the first side plate 11 to the fourth side plate 14. ing. The break line 32 also extends to the joint piece 16, but the break line 32 of the joint piece 16 overlaps with the break line 32 of the fourth side plate 14. The break line 32 is composed of, for example, perforations.

The first side plate 11 to the fourth side plate 14 are provided with opening start portions 36a to 36d so as to be in contact with the break line 32. Specifically, the first side plate 11 is provided with the first opening start portion 36a at a position biased toward the second side plate 12 with respect to the central portion in the lateral direction, and the second side plate 12 is provided with the second opening start portion 36b. Is provided in the central part in the lateral direction. Further, the third side plate 13 is provided with the third opening start portion 36c at a position biased toward the fourth side plate 14 with respect to the central portion in the lateral direction, and the fourth side plate 14 has the fourth opening start portion 36d laterally. It is provided in the center of the direction.

Each opening start portion 36a to 36d includes a laterally extending upper side 35a and lower side 35b in the body portion 2 and a notch 35c connecting the upper side 35a and the lower side 35b. The upper side 35a is connected to the break line 32 at both ends in the lateral direction of the opening start portions 36a to 36d, and is configured as a part of the break line 32. That is, the upper side 35a is composed of perforations continuous with the break line 32. Further, the lower side 35b is composed of a bendable ruled line extending from the intersection with the notch 35c toward both ends of the opening start portions 36a to 36d. The upper side 35a has a convex shape that is inclined downward from the apex to both sides. Further, the lower side 35b has a concave shape that is inclined upward on both sides from the bottom point of the central notch 35c. That is, the opening start portions 36a to 36d have a rhombic shape. The notch 35c is provided between the upper side 35a point and the lower side 35b so as to connect the bottom point of the apex. When the packaging box 1 is opened, the opening start portions 36a to 36d are opened by inserting a hand such as a finger so that the pieces on both sides of the notch 35c are folded inward from the lower side 35b to serve as an operation opening.

Each break line 32 in the first side plate 11 to the fourth side plate 14 includes curved portions 38 connected to the mountain-shaped upper side 35a of the opening start portions 36a to 36d on both sides of the opening start portions 36a to 36d. The curved portion 38 is configured to extend so as to incline upward from both ends of the upper side 35a and then to incline downward. That is, both ends of the opening start portions 36a to 36d are concave bottom points, and a convex shape is formed outside the bottom points. Each of the opening start portions 36a to 36d is a place where a hand such as a finger is inserted and an opening force for opening is directly pulled outward and pulled upward. Each break line 32 is broken from the opening start portions 36a to 36d by the opening force by providing the curved portion 38 so as to incline upward from the connection point with the upper side 35a which is inclined downward of the opening start portions 36a to 36d. It is easy to tear along the line 32. Further, the break line 32 includes a wavy portion formed by the upper side 35a of the opening start portions 36a to 36d and the curved portion 38. As a result, even if an external force is applied during transportation or storage, the breaking line 32 is less likely to be broken than in the case of a linear shape.

Each of the first side plate 11 to the fourth side plate 14 extends between the guide ruled line 31 and the break line 32 from the vicinity of both ends of the opening start portions 36a to 36d toward both corners on the top surface side. The first opening auxiliary ruled line 37a to the fourth opening auxiliary ruled line 37d are provided. Specifically, the first side plate 11 is provided with the first opening auxiliary ruled line 37a from the vicinity of both ends of the first opening start portion 36a toward the top flap ruled line 18, and the second side plate 12 is provided with the second opening. A second opening auxiliary ruled line 37b is provided from the vicinity of both ends of the start portion 36b toward the top flap ruled line 18. Further, the third side plate 13 is provided with a third opening auxiliary ruled line 37c from the vicinity of both ends of the third opening start portion 36c toward the top flap ruled line 18, and the fourth side plate 14 is provided with the fourth opening start portion. A fourth opening auxiliary ruled line 37d is provided from the vicinity of both ends of the 36d toward the top flap ruled line 18.

Each of the first side plate 11 to the fourth side plate 14 is provided with two opening auxiliary ruled lines 37a to 37d. Each of the two opening auxiliary ruled lines 37a to 37d in each side plate 11 to 14 includes an upper first end portion and a lower second end portion. The upper first end portion is located on the line of the guide ruled line 31, and the lower second end portion is located on the line of the break line 32 and is located near both ends of the opening start portions 36a to 36d. The distance between the first end portions of the two opening auxiliary ruled lines 37a to 37d is set wider than the distance between the second end portions. In each of the first side plates 11 to 14 and the opening auxiliary ruled lines 37a to 37d, each of the opening auxiliary ruled lines 37a to 37d may be connected to both ends in the lateral direction of the opening start portions 36a to 36d, but they are not connected here. ..

In the packaging box configured as described above, the body portion 2 is formed by connecting the first side plate 11 and the fourth side plate 14 via the joining piece 16, and then the bottom inner flaps 22, 24 and the bottom outer flaps 21, 23. The bottom surface is formed by bending inward through the bottom surface flap ruled line 17. In this state, the product is stored in the body portion 2. After that, the top surface flaps 27, 29 and the top surface outer flaps 26, 28 are bent inward via the top surface flap ruled line 18 to form the top surface.

Next, the operation of the packaging box configured as described above will be described.
As shown in FIG. 3, such packaging boxes 1 are stacked during the transportation of goods. Then, the load of the packaging boxes 1 stacked on the upper side is applied to the lower packaging box 1. The number of packaging boxes stacked on the bottom packaging box 1 is one in FIG. 3, but more packaging boxes may be stacked. In addition, different types of packaging boxes and packaging boxes containing different products may be stacked. Then, due to the load of the stacked packaging boxes, the vicinity of the top surface of the lower packaging box 1 is bent inward by the guide ruled line 31 so as to be crushed, and the step crushed portion 39 is formed. Since the load of the step crushed portion 39 increases as the packaging box 1 is located on the lower side, the step crushed portion 39 is largely bent at the guide ruled line 31. The step crushed portion 39 crushed by the guide ruled line 31 preferentially supports the load of the packaging box 1 located on the upper side over the side plates 11 to 14. As a result, the position of the break line 32 is a portion having low strength, but swelling toward the outside is suppressed.

As shown in FIG. 4, when opening each packaging box 1, the operator first faces the second side plate 12 or the fourth side plate 14. Then, the opening start portions 36a and 36c of the first side plate 11 and the third side plate 13 facing each other are opened by a hand such as a finger. Then, an opening force for opening the first side plate 11 and the third side plate 13 is applied so as to pull outward and pull upward. As a result, the first side plate 11 and the third side plate 13 bend so that the region between the opening auxiliary ruled lines 37a and 37c swells at the opening auxiliary ruled lines 37a and 37c starting from the opening start portions 36a and 36b. Further, the break line 32 starts to be cut from the opening start portions 36a and 36b through the curved portion 38 (see (1) in FIG. 4). Then, almost the entire area of the break line 32 of the first side plate 11 and the third side plate 13 is broken.

Next, the operator faces the first side plate 11 or the third side plate 13. Then, the opening start portions 36b and 36d of the second side plate 12 and the fourth side plate 14 facing each other are opened by a hand such as a finger. Then, an opening force is applied to the second side plate 12 and the fourth side plate 14. As a result, the second side plate 12 and the fourth side plate 14 bend so that the region between the opening auxiliary ruled lines 37b and 37d swells at the opening auxiliary ruled lines 37b and 37d starting from the opening start portions 36b and 36d. Further, the breaking line 32 starts to be broken from the opening start portions 36b and 36d through the curved portion 38. Then, the packaging box 1 is vertically divided at the position of the break line 32 over the entire circumference (see (2) in FIG. 4). As a result, the upper half of the packaging box 1 is removed, and the goods are exposed and displayed. At this time, the lower half body 4 is used as a tray.

In removing the upper half body 3, the first side plate 11 and the third side plate 13 are length planes, the first opening start portion 36a is provided unevenly on the second side plate 12, and the third opening start portion 36c is provided. , Is provided unevenly on the fourth side plate 14. That is, the first opening start portion 36a and the third opening start portion 36c are provided near the diagonal of the body portion 2, and are provided at particularly distant positions in the body portion 2. Therefore, in the step (1) in FIG. 4, the breaking line 32 of the first side plate 11 may not be broken near the fourth side plate 14. In addition, the break line 32 of the third side plate 13 may not be broken near the second side plate 12.

In this regard, in the step (2) in FIG. 4, the second side plate 12 and the fourth side plate 14 are completely broken along the break line 32 of the second side plate 12 and the fourth side plate 14. Then, even if a portion that is not broken remains in the first side plate 11 and the third side plate 13 breaking line 32, in a series of operations for breaking the breaking line 32 in the second side plate 12 and the fourth side plate 14. The remaining portion where the break line 32 of the first side plate 11 and the third side plate 13 is not broken can also be broken.

As a method of opening the packaging box 1, after breaking the break line 32 of the second side plate 12 and the fourth side plate 14 (see (2) in FIG. 4), the first side plate 11 and the third side plate 13 are broken. It is also possible to break the wire 32.

According to the packaging box 1 in the first embodiment as described above, the effects listed below can be obtained.
(1-1) Even if a load is applied to the packaging box 1 from above, the packaging box 1 is bent inward by the guide ruled line 31, and the load is preferentially supported by the step crushed portion 39. As a result, the packaging box 1 can suppress deformation that swells outward at the position of the break line 32.

(1-2) The guide ruled line 31 is provided between the break line 32 and the top flap ruled line 18 closer to the top flap ruled line 18 than the break line 32. That is, the guide ruled line 31 is provided closer to the top flap ruled line 18 than the break line 32. As a result, the step-crushed portion 39 does not become too large, and the packaging box 1 stacked on the upper side can be stably supported. Further, since the step-crushed portion 39 is made smaller, it is possible to suppress deterioration of the appearance of the stacked packaging boxes 1.

(1-3) A hand such as a finger can be put in the opening start portions 36a to 36d, and the break line 32 can be cut by the continuation. Therefore, in the packaging box 1, the work of removing the upper half body 3 becomes easy.

(1-4) The break line 32 includes a curved portion 38 at the opening start portions 36a to 36d, in which the upper side 35a is inclined downward from the apex toward both sides and extends upward from both ends thereof. Therefore, the opening force makes it easy to break the break line 32 from the opening start portions 36a to 36d.

(1-5) Since the notch 35c is provided between the upper side 35a and the lower side 35b, the opening start portions 36a to 36d can be opened by opening both sides with the notch 35c as a boundary.

(1-6) The lower side 35b is composed of a bendable ruled line extending from the intersection with the notch 35c toward both ends of the opening start portions 36a to 36d. Therefore, the piece blocking the opening start portions 36a to 36d can be folded inward through the ruled line.

(1-7) The break line 32 includes a wavy portion formed by the upper side 35a of the opening start portions 36a to 36d and the curved portion 38. As a result, even if an external force is applied during transportation or storage, the breaking line 32 is less likely to be broken than in the case of a linear shape. That is, the break line 32 is configured to be easily broken at the time of opening and hard to be broken at other times.

(1-8) When the upper half body 3 is removed, the first side plate 11 to the fourth side plate 14 bends so that the area between the opening auxiliary ruled lines 37a to 37d swells at the opening auxiliary ruled lines 37a to 37d. It is possible to assist the breakage of the break line 32. In particular, since the opening auxiliary ruled lines 37a to 37d are connected to the break line 32 and the guide ruled line 31, they are easily bent by the opening force starting from the opening start portions 36a to 36d, and as a result, the break line 32 is broken. It is assisted and makes it easier to remove the upper body 3.

<Second Embodiment>
The packaging box 1 as the second embodiment is provided so that the guide ruled line 41 and the top flap ruled line 18 on the first side plate 11 to the fourth side plate 14 have a trapezoidal shape. That is, as shown in FIGS. 5 and 6, the guide ruled line 41 includes a parallel portion 41a parallel to the top flap ruled line 18 and two inclined portions 41b located on both sides of the parallel portion 41a. The parallel portion 41a has a linear shape shorter than the top flap ruled line 18 of the first side plate 11 to the fourth side plate 14. Each of the two inclined portions 41b includes a first end portion and a second end portion, the first end portion is connected to the end portion of the parallel portion 41a, and the second end portion is the first side plate 11 to the fourth. It is connected to the end of the guide ruled line 41 on the side plate 14. The first spacing 42 of the first end of the two inclined portions 41b is set to be narrower than the second spacing 43 of the second end. The second end of each inclined portion 41b is located at the upper corner portion in the packaging box 1.

Even in the packaging box 1 according to the second embodiment configured as described above, when stacked, the load of the packaging box 1 stacked on the upper side is applied to the lower packaging box 1. Then, as shown in FIG. 7, due to this load, the vicinity of the top surface of the lower packaging box 1 is bent inward by the guide ruled line 41, and the step crushed portion 39 is formed. The step crushed portion 39 crushed by the guide ruled line 41 supports the load of the upper packaging box 1. As a result, the position of the break line 32 is a portion having low strength, but swelling toward the outside is suppressed.

According to the packaging box 1 in the second embodiment as described above, the effects listed below can be obtained.
(2-1) Since the end portion of the parallel portion 41a and the end portion of the top flap ruled line 18 are connected by the inclined portion 41b, the step collapsed portion 39 is more likely to be formed than in the first embodiment.

The first embodiment and the second embodiment may be appropriately modified and implemented as follows.
In the second embodiment, the second interval 43, which is the interval between the second ends connected to the end of the top flap ruled line 18 in the inclined portion 41b, is the first interval of the first end portion connected to the end of the parallel portion 41a. It may be narrower than 42.

-The inclined portion 41b may be omitted and only the parallel portion 41a may be used. The parallel portion 41a in this case is separated from the vertical ruled line 15.
-In the first embodiment and the second embodiment, each of the opening auxiliary ruled lines 37a to 37d may be connected to both ends in the lateral direction of the opening start portions 36a to 36d, unlike the above-mentioned example. Further, the opening auxiliary ruled lines 37a to 37d may be omitted.

-In the first embodiment and the second embodiment, the curved portion 38 may be omitted and the break line 32 may have a linear shape. When the break line 32 has a linear shape, the break line 32 in the first side plate 11 to the fourth side plate 14 may be parallel to the top flap ruled line 18 or faces the vertical ruled lines 15 located on both sides. It may be inclined upward or downward.

The opening start portions 36a to 36d may be configured such that the ruled line on the lower side 35b is a perforation and is surrounded by a break line such as a perforation. In this case, by inserting a hand such as a finger into the opening start portions 36a to 36d, the piece blocking the opening start portions 36a to 36d can be removed and opened.

-At the opening start portions 36a to 36d, the upper end position of the notch 35c may be biased to either one in the lateral direction with respect to the center of the upper side 35a. The lower end position of the notch 35c may also be biased to either side in the lateral direction with respect to the center of the lower side 35b.

-The notch 35c may be omitted from the opening start portions 36a to 36d.
-At the opening start portions 36a to 36d, the curved portion 38 may be connected to the lower side 35b instead of the upper side 35a. In this case, it is preferable that the upper side 35a of each opening start portion 36a to 36d is a ruled line and the lower side 35b is a perforation.

-The opening start portions 36a to 36d may be holes formed in advance.
-The opening start portion may be configured to be provided only on either one of the pair of side plates 11 and 13 or the side plates 12 and 14 facing each other.

The break line 32 may be provided above the central portion or below the central portion in the vertical direction, instead of the central portion.
The guide ruled line 31 may be provided at the center position between the top flap ruled line 18 and the break line 32. Further, the guide ruled line 31 may be provided closer to the break line 32 than the top flap ruled line 18.

In the first side plate 11, the first opening start portion 36a and the opening auxiliary ruled line 37a are provided unevenly on the fourth side plate 14, and in the third side plate 13, the third opening start portion 36c and the opening auxiliary ruled line 37c are the third. 2 It may be provided unevenly on the side plate 12.

Further, in the first side plate 11, the first opening start portion 36a may be provided at the central portion in the lateral direction. In this case, the opening auxiliary ruled line 37a is also provided at the central portion in the lateral direction in accordance with the first opening start portion 36a. Further, in the third side plate 13, the third opening start portion 36c may also be provided at the central portion in the lateral direction. In this case, the opening auxiliary ruled line 37c is also provided at the central portion in the lateral direction in accordance with the third opening start portion 36c.

-The packaging box is not limited to a rectangular parallelepiped shape as a whole. For example, the packaging box 1 may have a triangular prism shape, a pentagonal prism shape, or the like.
-The packaging box may be made of thick paper or the like instead of corrugated cardboard.

1 ... Packaging box 2 ... Body 3 ... Upper half body 4 ... Lower half body 11-14 ... 1st to 4th side plates 15 ... Vertical ruled line 16 ... Joint piece 17 ... Bottom flap ruled line 18 ... Top flap ruled line 21, 23 ... Bottom outer flaps 22, 24 ... Bottom inner flaps 26, 28 ... Top surface outer flaps 27, 29 ... Top surface inner flaps 31 ... Guided ruled lines 32 ... Break lines 35a ... Upper side 35b ... Lower side 35c ... Notches 36a to 36d ... First -Fourth opening start part 37a-37d ... First-fourth opening auxiliary ruled line 38 ... Curved part 39 ... Step crushed part 41 ... Guided ruled line 41a ... Parallel part 41b ... Inclined part 42 ... First interval 43 ... Second interval

Claims (7)

In a packaging box provided with a body portion surrounded by a plurality of side plates and a top surface flap connected to each upper side of the body portion for forming the top surface.
A flap ruled line provided on each upper side of the body portion and allowing the top flap to be bent, and a flap ruled line.
A guide ruled line that extends in the same direction close to the flap ruled line,
A packaging box including a breaking line provided over the entire circumference of the body portion. The packaging box according to claim 1, wherein at least a pair of side plates constituting the body portion are provided with an opening start portion in contact with the break line. The opening start portion includes an upper side and a lower side.
The upper side is a part of the break line and has a convex shape that inclines downward from the apex toward both sides.
The packaging box according to claim 2, wherein the break line is inclined upward from both ends of the upper side. The packaging box according to claim 3, wherein a notch is provided between the upper side and the lower side of the opening start portion. The packaging box according to claim 4, wherein the lower side of the opening start portion is formed of a bendable ruled line extending from an intersection with the notch toward both ends of the opening start portion. Claims 2 to 5 include a pair of opening auxiliary ruled lines extending from the vicinity of both ends of the opening start portion toward both corners on the top surface side of the side plate having the opening start portion. The packaging box according to any one of the items. The guide ruled line is characterized by including a parallel portion parallel to the flap ruled line and an inclined portion connecting the end portion of the parallel portion and the end portion of the flap ruled line on each upper side of the body portion. The packaging box according to any one of claims 1 to 6.

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