JP6881176B2 - Packaging box and blank sheet - Google Patents

Description

The present invention relates to a packaging box and a blank sheet constituting the packaging box.

A type A corrugated cardboard box, which is an example of a packaging box, has a rectangular parallelepiped shape having a bottom plate and a top plate. The A-type corrugated cardboard box includes four side plates surrounding the periphery, a bottom plate composed of flaps connected to the bottom of each side plate, and a top plate composed of flaps connected to the top of each side plate. .. The top plate is sealed by abutting a pair of outer flaps connected to the length surface. A configuration has been proposed for this type of packaging box to enable display and display of products (see, for example, Patent Documents 1 to 3). In the packaging boxes described in Patent Documents 1 to 3, the top plate is cut off leaving a part of the top plate, and other packaging boxes are stacked with the remaining top plate as a support portion.

Japanese Unexamined Patent Publication No. 2003-112723 Japanese Unexamined Patent Publication No. 2003-246319 Japanese Unexamined Patent Publication No. 2016-190645

On the other hand, if a part of the top plate is cut off as in the packaging boxes described in Patent Documents 1 to 3, there is a concern that the strength of the corrugated cardboard box may be reduced, or it may take time to dispose of the cut top plate. To do. On the other hand, if each flap of the top plate is opened without cutting off a part of the top plate, the support part for stacking other packaging boxes disappears from the packaging box, and each flap spreading outside the packaging box is packaged. It unnecessarily expands the occupied space of the box.
An object of the present invention is to provide a packaging box and a blank sheet that enable stacking in an opened packaging box and suppression of expansion of occupied space.

A packaging box that solves the above problems includes a bottom plate, an outer flap that is connected to a long surface (hereinafter, also referred to as a long side plate), and an inner flap that is connected to a width surface (hereinafter, also referred to as a width side plate). A top plate that covers an opening facing the bottom plate is provided. The length surface and the width surface are provided with a first planned cutting line orthogonal to the ridge of the length surface and the width surface, and the outer flap and the inner flap are the length surface and the outer flap. A second planned cutting line facing the first planned cutting line is provided in a state of being folded so that the width surface and the inner flap face each other, and the first planned cutting line is provided. Each end and each end of the second planned cutting line are connected by a crease line.

A blank sheet for solving the above problems includes a bottom plate, an outer flap connected to a length surface, an inner flap connected to a width surface, and a top plate covering an opening facing the bottom plate. .. The length surface and the width surface are provided with a first planned cutting line orthogonal to the ridge of the length surface and the width surface in the packaging box, and the outer flap and the inner flap are provided with the length surface. A second planned cutting line facing the first planned cutting line is provided in a state where the outer flap is opposed to the outer flap and the width surface and the inner flap are folded so as to face each other. Each end of the planned cutting line and each end of the second planned cutting line are connected by a crease line.

According to each of the above configurations, when the top plate of the packaging box is opened and each flap is folded back, the first planned cutting line and the second planned cutting line face each other. In this state, when the first planned cutting line and the second planned cutting line are cut so as to push the ridge toward the inside of the packaging box, the corners of the side plates sandwiching the ridge and the respective side plates facing the ridge are cut. The corners of the flap are folded along the crease line. Then, the corners formed by the corners of the side plates sandwiching the ridge and the corners of the flaps are deformed into valley-folded bent portions (support portions) pushed inside the packaging box. As a result, it becomes possible to stack other packaging boxes supported by the support portion on the opened packaging box of the top plate. At this time, the corners of each flap are fixed in a bent state along the crease line and continue to be located inside the packaging box. Therefore, the state in which the length surface and the outer flap face each other and the state in which the width surface and the inner flap face each other are maintained, and it is suppressed that each flap spreads to the outside of the packaging box. Therefore, according to each of the above configurations, it is possible to stack the opened packaging boxes and suppress the expansion of the occupied space.

In the packaging box, the first planned cutting line may be bisected at the ridge. According to this configuration, the lengths of the corners on each side plate can be made equal to each other, and the lengths of the corners on each flap can be made equal to each other. As a result, the load of the other stacked packaging boxes can be distributed almost evenly to each side plate, and it is possible to suppress an excessive load on one side plate.

In the packaging box, the length of the first planned cutting line may be equal to or longer than the length of the second planned cutting line. According to this configuration, it is possible to make all of the first planned cutting lines face the second planned cutting lines. Therefore, when each corner is pushed inward, the corner in the flap is more smoothly bent inward without part of it being pushed back to the side plate.

The packaging box includes two planned cutting lines and two planned cutting lines, and the two planned cutting lines are diagonally viewed from a direction facing the opening. It may be located. According to this configuration, the valley-folded support portions recessed inside the packaging box are located diagonally when viewed from the direction facing the opening. Therefore, it is possible to improve the stability of the position of the packaging boxes to be stacked as compared with the configuration in which the valley-folded support portion is provided at one place. Further, it is possible to suppress a decrease in the strength of the packaging box itself as compared with a configuration in which the valley-folded support portions are provided at three or more locations.

The perspective view which shows the structure of a packaging box. The perspective view which shows the partial structure of a packaging box. Top view showing a blank sheet for manufacturing a packaging box. The perspective view which shows the process of folding the support part of a packaging box inside an opening. The perspective view which shows the structure when the support part of a packaging box is folded inside the opening. The perspective view when the packaging boxes in which the support part of the packaging box is folded inside the opening are stacked.

An embodiment of the packaging box 1 and the blank sheet 2 will be described with reference to FIGS. 1 to 6. In the following description, a type A corrugated cardboard box is shown as an example of the packaging box 1.

[Packaging box 1]
As shown in FIG. 1, among the four side plates in the packaging box 1, the length surface is the long side plate and the width surface is the width side plate. The pair of long side plates are a front plate 12 and a rear plate 13. The pair of width side plates are the left plate 14 and the right plate 15. The packaging box 1 includes a bottom plate 11, four side plates 12, 13, 14, 15, and a top plate 16. Each side plate 12, 13, 14, 15 includes top edges 12U, 13U, 14U, 15U. The four top edges 12U, 13U, 14U, and 15U partition the opening 11T facing the bottom plate 11. The direction from the bottom plate 11 to the top plate 16 is the height direction. The direction from the left plate 14 to the right plate 15 is the length direction. The direction from the front plate 12 to the rear plate 13 is the width direction.

The top plate 16 covers the entire opening 11T by a pair of outer flaps 16F1, 16F3 and a pair of inner flaps 16F2, 16F4. The outer flaps 16F1, 16F3 and the inner flaps 16F4, 16F2 are connected to the top edges 12U, 13U, 14U, 15U of the side plates 12, 13, 14, and 15.

The outer flaps 16F1, 16F3 are bent at the top edges 12U, 13U so as to cover the opening 11T, and the flap ends 16E1, 16E3 are abutted against each other. The inner flaps 16F4 and 16F2 are bent at the top edges 14U and 15U so as to cover a part of the opening 11T, and support the outer flaps 16F1 and 16F3 from the inside.

The four side plates 12, 13, 14, 15 constitute the four ridges 12R, 13R, 14R, 15R. The ridge 12R is composed of a front plate 12 and a right plate 15, and the ridge 12R is composed of a rear plate 13 and a left plate 14. The ridge 14R is composed of a front plate 12 and a left plate 14, and the ridge 15R is composed of a rear plate 13 and a right plate 15. The two support structures 20 are located on two diagonal ridges 12R and 13R among these four ridges 12R, 13R, 14R and 15R. One support structure 20 is located at a corner formed by the ridge 12R and the top edges 12U and 15U, respectively. The other support structure 20 is located at the corner formed by the ridge 13R and the top edges 13U and 14U, respectively.

[Support structure 20]
One support structure 20 and the other support structure 20 have different side plates that form the support structure 20, while the sizes and shapes of the corners that form the support structure 20 are substantially equal to each other in each support structure 20. .. In the following, one support structure 20 including the ridge 12R will be described in detail, and the description of the overlapping configuration of the other support structure 20 including the ridge 13R will be omitted.

As shown in FIG. 2, the front plate 12 includes a side plate corner portion 12A in the upper right corner of the front plate 12. The height direction of the side plate corner portion 12A is partitioned by a planned cutting line 212 extending in the length direction and a top edge 12U. The length direction of the side plate corner portion 12A is partitioned by the crease line 232 and the ridge 12R. The side plate corner portion 12A has a rectangular shape surrounded by a planned cutting line 212, a crease line 232, a top edge 12U, and a ridge 12R.

The right plate 15 includes a side plate corner portion 15A at the front upper corner of the right plate 15. The height direction of the side plate corner portion 15A is defined by a planned cutting line 215 extending in the width direction and a top edge 15U. The width direction of the side plate corner portion 15A is partitioned by the crease line 245 and the ridge 12R. The side plate corner portion 15A has a rectangular shape surrounded by a planned cutting line 215, a crease line 245, a top edge 15U, and a ridge 12R.

The two side plate corners 12A and 15A are connected by one ridge 12R. The planned cutting line 212 for partitioning the corner portion 12A of the side plate and the planned cutting line 215 for partitioning the corner portion 15A of the side plate are one first planned cutting line 21 continuous through the ridge 12R.

The outer flap 16F1 includes a flap corner portion 12B at the front upper corner of the outer flap 16F1. The length direction of the flap corner 12B is defined by a crease line 236 extending in the width direction. The width direction of the flap corner 12B is partitioned by the planned cutting line 222 and the top edge 12U. The flap corner 12B has a rectangular shape surrounded by a planned cutting line 222, a crease line 236, and a top edge 12U. The side plate corner portion 12A and the flap corner portion 12B are connected to each other via a top edge 12U. Further, the crease line 232 for partitioning the side plate corner portion 12A and the crease line 236 for partitioning the flap corner portion 12B are one crease line 23 continuous at the top edge 12U.

The inner flap 16F2 includes a flap corner portion 15B at the front upper corner of the inner flap 16F2. The length direction of the flap corner portion 15B is defined by a planned cutting line 225 extending in the width direction and a top edge 15U. The width direction of the flap corner portion 15B is defined by the crease line 246. The flap corner 15B has a rectangular shape surrounded by a planned cutting line 225, a crease line 246, and a top edge 15U. The side plate corner portion 15A and the flap corner portion 15B are connected to each other via a top edge 15U. Further, the crease line 245 for partitioning the side plate corner portion 15A and the crease line 246 for partitioning the flap corner portion 15B are one crease line 24 continuous at the top edge 15U.

Each planned cutting line 21 and 22 is a cut provided intermittently along the portion to be cut, and the shape of the cut is, for example, a dot shape, a straight line shape, a dogleg shape, or an L shape. It can be set to any shape such as.

One of the support structures 20 is composed of the side plate corners 12A and 15A and the flap corners 12B and 15B. When the top plate 16 is opened, the pair of outer flaps 16F1, 16F3 and the pair of inner flaps 16F2, 16F4 have their side plates 12, 13, 14, with the top edges 12U, 13U, 14U, and 15U as the turning axes. Folded to the outside of 15. Then, when the pair of outer flaps 16F1, 16F3 and the pair of inner flaps 16F2, 16F4 are folded back to positions facing the outer surfaces of the side plates 12, 13, 14, 15, the side plate corners 12A and the flap corners 12B And overlap each other, and the side plate corner 15A and the flap corner 15B overlap each other.

[Blank sheet]
Next, the blank sheet 2 for manufacturing the packaging box 1 will be described.
As shown in FIG. 3, in one blank sheet 2, the strip-shaped joint margin 17, the rectangular front plate 12, the right plate 15, the rear plate 13, and the left plate 14 are connected in this order. .. The joint margin 17 is continuously provided to the front plate 12 via the vertical ruled line 17C. The front plate 12 is connected to the right plate 15 via the vertical ruled line 12C, the right plate 15 is connected to the rear plate 13 via the vertical ruled line 15C, and the rear plate 13 is connected to the rear plate 13 via the vertical ruled line 13C. It is connected to the plate 14 continuously. The vertical ruled line 12C constitutes the ridge 12R in the packaging box 1, and the vertical ruled line 15C constitutes the ridge 15R in the packaging box 1. Further, the vertical ruled line 13C constitutes a ridge 13R in the packaging box 1, and the vertical ruled line 17C constitutes a ridge 14R in the packaging box 1.

The outer flap 11F1 is continuously provided to the front plate 12 via the horizontal ruled line 12DC. The outer flap 16F1 is continuously provided to the front plate 12 via the horizontal ruled line 12UC. The outer flap 11F3 is continuously provided to the rear plate 13 via the horizontal ruled line 13DC. The outer flap 16F3 is continuously provided to the rear plate 13 via the horizontal ruled line 13UC. The inner flap 11F2 is continuously provided to the right plate 15 via the horizontal ruled line 15DC. The inner flap 16F2 is continuously provided to the right plate 15 via the horizontal ruled line 15UC. The inner flap 11F4 is connected to the left plate 14 via the horizontal ruled line 14DC. The inner flap 16F4 is connected to the left plate 14 via the horizontal ruled line 14UC. The horizontal ruled lines 12UC, 13UC, 14UC, and 15UC constitute the top edges 12U, 13U, 14U, and 15U in the packaging box 1.

The side plate corner portion 12A and the side plate corner portion 15A constituting one of the support structures 20 are connected to each other via a vertical ruled line 12C. The side plate corner portion 12A and the flap corner portion 12B constituting one of the support structures 20 are connected to each other via a horizontal ruled line 12UC. The side plate corner portion 15A and the flap corner portion 15B constituting one of the support structures 20 are connected to each other via a horizontal ruled line 15UC.

As with the one support structure 20, the side plate corner portion 13A and the side plate corner portion 14A constituting the other support structure 20 are continuously provided via the vertical ruled line 13C. The side plate corner portion 14A and the flap corner portion 13B constituting the other support structure 20 are connected to each other via a horizontal ruled line 13UC. The side plate corner portion 14A and the flap corner portion 14B constituting the other support structure 20 are connected to each other via a horizontal ruled line 14UC.

Next, taking one of the support structures 20 as an example, the sizes of the side plate corners 12A, 13A, 14A, 15A constituting the support structure 20 and the flap corners 12B, 13B, 14B, 15B constituting the support structure 20 Explain the size. The direction from the outer flap 11F1 to the outer flap 16F1 corresponds to the height direction. Further, the direction from the outer flap 11F1 to the inner flap 11F2 corresponds to the length direction and the width direction.

The two side plates 12 and 15 include a first planned cutting line 21. The first planned cutting line 21 is a cut provided intermittently along the portion to be cut, and the shape of the cut is arbitrary, for example, a dot shape, a straight line shape, a dogleg shape, an L shape, or the like. It can be set to the shape of. The first planned cutting line 21 is separated from the horizontal ruled lines 12UC and 15UC in the height direction. The first planned cutting line 21 is parallel to each of the horizontal ruled lines 12UC and 15UC, is continuous between the side plates 12 and 15, and is each planned cutting line by the vertical ruled line 12C orthogonal to the first planned cutting line 21. It is divided into 212 and 215.

The distance between the horizontal ruled lines 12UC and 15UC and the first planned cutting line 21 is the first height H11. The first height H11 is shorter than the length of the outer flap 16F1 in the height direction and the length of the inner flap 16F2 in the height direction. In the length direction, the length of the first planned cutting line 21 is the first distance L1. Of the first planned cutting line 21, the length L11 at the front plate 12 is the length of the planned cutting line 212, which is approximately half of the first distance L1. Of the first planned cutting line 21, the length L12 on the right plate 15 is the length of the planned cutting line 215, which is approximately half of the first distance L1. That is, in the first planned cutting line 21, the length L11 at the front plate 12 and the length L12 at the right plate 15 are substantially equal.

The two flaps 16F1 and 16F2 include a second planned cutting line 22. The second planned cutting line 22 is separated from the horizontal ruled lines 12UC and 15UC in the height direction. The second planned cutting line 22 is parallel to each of the horizontal ruled lines 12UC and 15UC, is interrupted between the flaps 16F1 and 16F2, and is divided into the planned cutting line 222 and the planned cutting line 225.

The distance between each of the horizontal ruled lines 12UC and 15UC and each of the second planned cutting lines 22 is the second height H12. The second height H12 is substantially equal to the first height H11. In the length direction, the length of the second planned cutting line 22 is the second distance L2, which is substantially equal to the first distance L1. Of the second planned cutting line 22, the length L21 at the outer flap 16F1 is the length of the planned cutting line 222, and is slightly shorter than the length L11 by the gap between the outer flap 16F1 and the inner flap 16F2. .. Of the second planned cutting line 22, the length L22 at the inner flap 16F2 is the length of the planned cutting line 225, and is slightly shorter than the length L12 by the gap between the outer flap 16F1 and the inner flap 16F2. ..

The front plate 12 and the outer flap 16F1 include one crease line 23 extending in the height direction. The crease line 23 and the vertical ruled line 12C are parallel to each other, and the crease line 23 is continuous between the front plate 12 and the outer flap 16F1. The crease line 23 connects the end of the first planned cutting line 21 located on the front plate 12 and the end of the second planned cutting line 22 located on the outer flap 16F1. In the height direction, the length of the crease line 23 is the sum of the first height H11 and the second height H12. That is, the crease line 23 is bisected into a crease line 232 and a crease line 236 by the horizontal ruled line 12UC.

The right plate 15 and the inner flap 16F2 include one crease line 24 extending in the height direction. The crease line 24 and the vertical ruled line 12C are parallel to each other, and the crease line 24 is continuous between the right plate 15 and the inner flap 16F2. The crease line 24 connects the end of the first planned cutting line 21 located on the right plate 15 and the end of the second planned cutting line 22 located on the inner flap 16F2. In the height direction, the length of the crease line 24 is the sum of the first height H11 and the second height H12. That is, the crease line 24 is bisected into a crease line 245 and a crease line 246 by the horizontal ruled line 12UC.

The side plate corner portion 12A of the front plate 12 is partitioned by the first planned cutting line 21 (212), the crease line 23 (232), the horizontal ruled line 12UC, and the vertical ruled line 12C in the front plate 12. The flap corner portion 12B of the outer flap 16F1 is partitioned by the second planned cutting line 22 (222), the crease line 23 (236), and the horizontal ruled line 12UC in the outer flap 16F1.

The side plate corner portion 15A of the right plate 15 is partitioned by the first planned cutting line 21 (215), the crease line 24 (245), the horizontal ruled line 15UC, and the vertical ruled line 12C on the right plate 15. The flap corner portion 15B of the inner flap 16F2 is partitioned by the second planned cutting line 22 (225), the crease line 24 (246), and the horizontal ruled line 15UC in the inner flap 16F2.

The side plate corner portion 13A of the rear plate 13 is partitioned by the planned cutting line, the horizontal ruled line 13UC, and the vertical ruled line 13C in the rear plate 13, similarly to the side plate corner portion 12A. The flap corner portion 13B of the outer flap 16F3 is partitioned by the planned cutting line, the crease line, and the horizontal ruled line 13UC in the outer flap 16F3. Further, the side plate corner portion 14A of the left plate 14 is partitioned by a planned cutting line, a crease line, a horizontal ruled line 14UC, and a vertical ruled line 13C in the left plate 14. The flap corner portion 14B of the inner flap 16F4 is partitioned by the planned cutting line, the crease line, and the horizontal ruled line 14UC in the inner flap 16F4.

[Action]
The procedure for forming the support portion 30 from the support structure 20 will be described. The side plates that make up the support structure 20 are different from the one support structure 20 and the other support structure 20, but the sizes and shapes of the corners that make up the support structure 20 are substantially the same. Hereinafter, the procedure in the support structure 20 including a part of the front plate 12 and a part of the right plate 15 will be described in detail.

As shown in FIG. 4, in the packaging box 1 in which the top plate 16 is opened, the outer flap 16F1 is folded so that the outer flap 16F1 faces the outer surface (length surface) of the front plate 12. Further, the inner flap 16F2 is folded so that the inner flap 16F2 faces the outer surface (width surface) of the right plate 15. As a result, the first planned cutting line 21 and the second planned cutting line 22 face each other.

Next, the flap corner portion 12B of the outer flap 16F1 and the side plate corner portion 12A of the front plate 12 are pushed toward the inside of the packaging box 1 by a hand HD or the like. Further, the flap corner portion 15B of the inner flap 16F2 and the side plate corner portion 15A of the right plate 15 are pushed toward the inside of the packaging box 1 by a hand HD or the like.

At this time, the flap corner portion 12B of the outer flap 16F1 is separated from the outer flap 16F1 at the planned cutting line 222 and bent at the crease line 236. Further, the side plate corner portion 12A of the front plate 12 is separated from the front plate 12 at the planned cutting line 212 and bent at the crease line 232. Similarly, the flap corner portion 15B of the inner flap 16F2 is separated from the inner flap 16F2 at the planned cutting line 225 and bent inward at the crease line 246. Further, the side plate corner portion 15A of the right plate 15 is separated from the right plate 15 at the planned cutting line 215 and bent inward at the crease line 245.

At this time, the side plate corner portion 12A and the side plate corner portion 15A are continuously provided via the ridge 12R. Further, the side plate corner portion 12A and the flap corner portion 12B are connected to each other via the top edge 12U, and the side plate corner portion 15A and the flap corner portion 15B are connected to each other via the top edge 15U. As a result, the flap corner portion 12B moves inside the packaging box 1 together with the side plate corner portion 12A about the crease line 236 as a rotation axis. The flap corner portion 15B also moves inside the packaging box 1 together with the side plate corner portion 15A about the crease line 246 as a rotation axis. As a result, the support structure 20 which is a corner formed by the side plate corner portions 12A and 15A and the flap corner portions 12B and 15B is a support portion 30 which is a valley-folded bent portion pushed inside the packaging box 1. Transforms into.

In the sealed packaging box 1, the angle formed by the side plate corner portion 12A and the side plate corner portion 15A is approximately 90 °, but the side plate corner portion 15A and the side plate corner portion are formed while the support portion 30 is being formed. The angle formed by 12A temporarily changes to 180 °. That is, the side plate corner portion 12A and the side plate corner portion 15A are temporarily aligned on substantially the same plane. In this respect, the packaging box 1 described above can be temporarily deformed by temporarily elastically deforming its overall shape or by bending the side plate corner portion 15A and the side plate corner portion 12A.

As shown in FIG. 5, the support portion 30 located on the front side of the paper surface in the drawing is a valley fold-shaped bent portion pushed inside the packaging box 1. Then, the shape is preferably maintained unless a force sufficient to return the flap corners 12B and 15B to the outside acts and a force sufficient to return the side plate corners 12A and 15A to the outside does not act.

At this time, the base ends of the side plate corners 12A and 15A and the base ends of the flap corners 12B and 15B are crease lines 23 and 24, and are directly supported by the side plates 12 and 15 and the flaps 16F1 and 16F2. Has been done. That is, the support portion 30 is supported by separate side plates 12 and 15 at separate crease lines 23 and 24. Further, in the support portion 30, the side plate corner portion 12A and the flap corner portion 12B are mountain-folded upward at the top edge 12U, and the side plate corner portion 15A and the flap corner portion 15B are the top edge 15U. And it is folded up. The upwardly folded corrugated cardboard is unlikely to undergo deformation such as bending with respect to the downward stress F. As a result, even if the downward stress F acts on the support portion 30, the shape of the support portion 30 can be maintained.

The support portion 30 located on the back side of the paper surface in the drawing also has a valley fold shape pushed inside the packaging box 1, and a force sufficient to return the corner portions 13A and 14A of the side plates to the outside does not act. As long as the shape is preferably maintained. Then, even if the downward stress F acts on the support portion 30, the shape can be maintained in the support portion 30.

As shown in FIG. 6, when the upper packaging box 1B is stacked on the lower packaging box 1A on which the support portion 30 is formed, the lower packaging box 1A has the top edges 12U, 15U, 13U, 14U, and 2 The bottom plate 11 of the upper packaging box 1B is supported by the two support portions 30. At this time, since each support portion 30 of the lower packaging box 1A projects inside the lower packaging box 1A, even if the bottom plate 11 of the upper packaging box 1B and the opening 11T of the lower packaging box 1A are slightly displaced from each other. It is possible for the lower packaging box 1A to support the upper packaging box 1B.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) The valley-folded support portion 30 pushed inside the packaging box 1 is formed by the side plate corners 12A and 15A sandwiching the ridge 12R and the flap corners 12B and 15B. As a result, another packaging box 1 supported by the support portion 30 can be stacked on the opened packaging box 1 of the top plate 16.

(2) Further, the flap corners 12B and 15B continue to be located inside the packaging box 1 in a state of being bent at the crease lines 23 and 24. Therefore, the side plates 12 and 15 and the flaps 16F1 and 16F2 are kept facing each other, and the flaps 16F1 and 16F2 are suppressed from spreading to the outside of the packaging box 1. Therefore, it is possible to prevent the space occupied by the opened packaging box 1 from expanding.

(3) In the support portion 30, the side plate corner portion 12A and the flap corner portion 12B are overlapped so as to form a mountain fold upward. The side plate corner 15A and the flap corner 15B are also stacked so as to form a mountain fold upward. Therefore, even if the downward stress F acts on the support portion 30, the shape of the support portion 30 can be maintained.

(4) Since the first planned cutting line 21 is bisected by the ridge 12R, the lengths of the side plate corners 12A and 15A should be equal to each other, and the lengths of the flap corners 12B and 15B should be equal to each other. Can be equal to each other. As a result, the load from the upper packaging box 1B can be distributed substantially evenly to the side plates 12 and 15, and it is possible to suppress an excessive load on one side plate. Then, the posture of the upper packaging box 1B can be maintained in a posture suitable for display or display.

(5) Since the length of the first planned cutting line 21 and the length of the second planned cutting line 22 are substantially equal, it is possible to make all of the first planned cutting line 21 face the second planned cutting line 22. .. Therefore, when the flap corners 12B and 15B are pushed inward, all of the flap corners 12B and 15B are smoother without being pushed back to the side plates 12 and 15 by a part of the flap corners 12B and 15B. It can also be folded inward.

The above embodiment can also be implemented in the following embodiments.
[Scheduled cutting line]
-The length L11 of the planned cutting line 212 and the length L12 of the planned cutting line 215 can be changed to different sizes from each other. Further, the length L21 of the planned cutting line 222 and the length L22 of the planned cutting line 225 can be changed to different sizes from each other.

The length L11 of the planned cutting line 212 and the length L21 of the planned cutting line 222 can be changed to the same size or different sizes from each other. Further, the length L12 of the planned cutting line 215 and the length L22 of the planned cutting line 225 can be changed to the same size or different sizes from each other. In addition, in the configuration where the length L11 of the planned cutting line 212 is larger than the length L21 of the planned cutting line 222, it is possible to obtain the effect according to the above (5). Further, in a configuration in which the length L12 of the planned cutting line 215 is larger than the length L22 of the planned cutting line 225, it is possible to obtain the effect according to the above (5).
Further, the first distance L1 of the first planned cutting line 21 and the second distance L2 of the second planned cutting line 22 can be changed to different sizes from each other.

-The first height H11 and the second height H12 can be changed to different sizes from each other. If the second height H12 is larger than the first height H11, the support portion 30 is formed so that the flap corners 12B and 15B ride on the first planned cutting line 21. As a result, the friction between the flap corners 12B and 15B and the side plates 12 and 15 can be increased in the support portion 30, so that the shape of the support portion 30 can be easily maintained.

[Support 30]
-The packaging box 1 may be changed to a configuration in which the support portions 30 are provided at at least one corner when viewed from the direction facing the opening 11T, and the packaging box 1 is provided with three or more support portions 30. is there.
-The size of the length surface and the width surface of the packaging box 1 may be the same. That is, the packaging box 1 may be square when viewed from the direction facing the opening 11T.

1 ... Packaging box, 1A ... Lower packaging box, 1B ... Upper packaging box, 2 ... Blank sheet, 11 ... Bottom plate, 11F1, 11F3, 16F1, 16F3 ... Outer flap, 11F2, 11F4, 16F2, 16F4 ... Inner flap, 11T ... Opening, 12 ... Front plate, 12A, 13A, 14A, 15A ... Side plate corner, 12B, 13B, 14B, 15B ... Flap corner, 12C, 13C, 15C, 17C ... Vertical ruled line, 12DC, 12UC, 13DC, 13UC, 14DC, 14UC, 15DC, 15UC ... Horizontal ruled line, 12R, 13R, 14R, 15R ... Ridge, 12U, 13U, 14U, 15U ... Top edge, 13 ... Rear plate, 14 ... Left plate, 15 ... Right plate, 16 ... Sky Plate, 16E1, 16E3 ... flap end, 20 ... support structure, 21 ... first planned cutting line, 22 ... second scheduled cutting line, 23, 24 ... crease line, 30 ... support part.

Claims (5)

It ’s a packaging box,
With the bottom plate
An outer flap connected to the length surface and an inner flap connected to the width surface are provided, and a top plate covering the opening facing the bottom plate is provided.
The length surface and the width surface are
A first planned cutting line orthogonal to the ridge of the length plane and the width plane is provided.
The outer flap and the inner flap
A second planned cutting line facing the first planned cutting line is provided in a state where the length surface and the outer flap face each other and the width surface and the inner flap are folded so as to face each other. ,
Each end of the first planned cutting line and each end of the second planned cutting line are connected by a crease line.
The outer flap is continuously provided on the length surface via a ruled line.
A packaging box in which the distance between the ruled line and the second planned cutting line is larger than the distance between the ruled line and the first planned cutting line. The packaging box according to claim 1, wherein the first planned cutting line is bisected by the ridge. The packaging box according to claim 2, wherein the length of the first planned cutting line is equal to or longer than the length of the second planned cutting line. The two first planned cutting lines and
With the two planned second cutting lines,
The packaging box according to any one of claims 1 to 3, wherein the two first planned cutting lines are located diagonally when viewed from a direction facing the opening. A blank sheet for manufacturing packaging boxes
With the bottom plate
An outer flap connected to the length surface and an inner flap connected to the width surface are provided, and a top plate covering the opening facing the bottom plate is provided.
The length surface and the width surface are
A first planned cutting line orthogonal to the ridge of the length surface and the width surface of the packaging box is provided.
The outer flap and the inner flap are
A second planned cutting line facing the first planned cutting line is provided in a state where the length surface and the outer flap face each other and the width surface and the inner flap are folded so as to face each other. ,
Each end of the first planned cutting line and each end of the second planned cutting line are connected by a crease line.
The outer flap is continuously provided on the length surface via a ruled line.
A blank sheet in which the distance between the ruled line and the second planned cutting line is larger than the distance between the ruled line and the first planned cutting line.

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