JP7366720B2 - packaging box - Google Patents

Description

The present invention relates to packaging boxes.

Patent Document 1 discloses a reinforcing box in which a reinforcing material is provided on the inner surface of a corner of a circumferential wall having a rectangular planar shape. The reinforcing material is constructed by bending the first to third reinforcing pieces into a triangular tube shape. The first reinforcing piece is connected to the side surface of the peripheral wall via a double fold line. After the first reinforcing piece is folded back inside the side part, the second and third reinforcing pieces are bent to form a triangular tube shape. The second reinforcing piece is provided with a locking protrusion, and the reinforcing member is held in a triangular cylindrical shape by locking the locking protrusion into a locking hole opened in the bottom of the reinforcing box.

Japanese Patent Application Publication No. 11-301642

However, in the above-mentioned reinforcing box, the reinforcing material cannot be formed into a triangular tube shape unless the user bends the first to third reinforcing pieces in order, and the reinforcing material cannot be assembled easily. Further, in the above-mentioned reinforcing box, the reinforcing material could not be held in the triangular tube shape unless the locking protrusion of the second reinforcing piece was locked in the locking hole in the bottom part.

In order to solve the above problems, the present invention provides a packaging box that can easily form a prismatic shape and can maintain the prismatic state.

The packaging box of the present invention includes a circumferential wall formed in a rectangular tube shape by connecting a plurality of outer walls in a circumferential direction, and a folding line formed at the upper end of at least a pair of adjacent outer walls among the plurality of outer walls. a pair of continuous flaps, the pair of said flaps are provided with a pair of column walls continuous in the circumferential direction via a regular fold line extended from the boundary line of the pair of said outer walls; A pair of inner walls are connected to the column wall via a reverse fold line, and a pair of inner walls are connected to the pair of outer walls via the fold line, and the pair of column walls are connected to the pair of outer walls by a cutting line. Separated from the outer wall, at least one of the pair of inner walls has a ruled line extending diagonally from near the intersection of the reverse fold line and the cutting line, and at least one of the pair of inner walls extends along the ruled line. While folding, in the process of folding the pair of inner walls back inside the peripheral wall along the folding line, the pair of pillar walls that were folded normally along the folding line are reversely folded along the pair of reverse folding lines. The inner wall that was bent at the ruled line is returned to a flat state, and the pair of inner walls are overlapped with the inner side of the outer wall, so that the inner wall is bent at the reverse fold line. The pair of pillar walls that are reversely folded along the normal fold line are held in a state in which the regular fold line projects inside the peripheral wall to form a square pillar.

In this case, a bottom portion that closes a lower end surface of the peripheral wall is further provided, a pair of protrusions are provided on the pair of pillar walls so as to bite into the pair of outer walls, and a pair of protrusions are provided on the bottom portion that correspond to the square pillars. In a state where an engaging hole is bored at the position and the pair of inner walls are folded back inside the peripheral wall, the pair of protrusions are hollowed out from the pair of outer walls along the cutting line, and the pair of protrusions are hollowed out from the pair of outer walls along the cutting line. The pair of protrusions of the lower packaging box may protrude above the inner wall and engage with the engagement holes of the upper packaging box when a plurality of the packaging boxes are stacked.

In other cases, a pair of protruding pieces are formed on the pair of outer walls so as to bite into the pair of column walls, and when the pair of inner walls is folded back inside the peripheral wall, the pair of protruding pieces The upper part of the section may be hollowed out from the pair of pillar walls along the cutting line and protrude above the square pillar.

In this case, a convex piece cutting line separating the pair of convex piece parts is formed on the boundary line of the pair of convex piece parts, and a convex piece cutting line is formed on the pair of the outer walls from the lower end of the convex piece cutting line to the cutting line. A pair of open fold lines may be formed that extend obliquely to both ends of the line.

In this case, it may further include a bottom portion that closes a lower end surface of the peripheral wall, and the lower end of the prism may contact the bottom portion.

In this case, it may further include a bottom portion that closes a lower end surface of the peripheral wall, and the lower end of the prism may be spaced apart from the bottom portion.

In this case, the plurality of flaps may be arranged in a row on all the outer walls, and the plurality of sets of the pillar walls forming the prism and the plurality of inner walls may be arranged in a row alternately in the circumferential direction.

According to the present invention, a prismatic column can be easily formed and the state in which the prismatic column is formed can be maintained.

FIG. 1 is a perspective view showing a packaging box according to a first embodiment of the present invention. FIG. 2 is a plan view showing a packaging box blank according to the first embodiment of the present invention. 1 is a perspective view showing a state in which a peripheral wall of a packaging box according to a first embodiment of the present invention is formed; FIG. FIG. 2 is a perspective view showing a state in which a pair of upper flaps of the packaging box according to the first embodiment of the present invention have begun to be folded down inside a peripheral wall. FIG. 2 is a perspective view showing a state in which a pair of upper flaps of the packaging box according to the first embodiment of the present invention are inserted inside a peripheral wall. 1 is a perspective view showing a packaging box according to a first embodiment of the present invention in a prismatic state; FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a packaging box according to a first embodiment of the present invention, showing a state with an open outlet. It is a top view which shows the blank of the packaging box based on 2nd Embodiment of this invention. FIG. 3 is a perspective view showing a packaging box according to a second embodiment of the present invention. It is a top view which shows the blank of the packaging box based on 3rd Embodiment of this invention. It is a perspective view showing the packaging box concerning a 3rd embodiment of the present invention. It is a top view which shows the blank of the packaging box based on 4th Embodiment of this invention. It is a perspective view which shows the packaging box based on 4th Embodiment of this invention. It is a top view which shows the blank of the packaging box based on the 1st modification of 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box based on the 2nd modification of 1st Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In addition, "Fr" shown in the drawings indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates " "D" indicates "upper", and "D" indicates "lower". The front-rear direction is perpendicular to the left-right direction, and the up-down direction is perpendicular to the front-rear direction and the left-right direction. Although terms indicating directions and positions are used in this specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[First embodiment: Overview of packaging box]
The configuration of the packaging box 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a packaging box 1. FIG. FIG. 2 is a plan view showing the blank 5 of the packaging box 1.

As shown in FIG. 1, the packaging box 1 is a tray-shaped box with an open upper end surface of a substantially rectangular cylindrical peripheral wall 1W. A plurality of articles (not shown) are accommodated inside the packaging box 1.

The packaging box 1 is formed by assembling blanks 5 shown in FIG. The blank 5 is formed, for example, by punching out a corrugated paper sheet using a cutting die or the like. The corrugated board sheet is, for example, a double-sided corrugated board sheet in which a front liner 9B and a back liner 9C (see FIG. 3) are bonded to the front and back sides of a corrugated medium 9A. Note that FIG. 2 shows the front liner 9B side (the outer surface side of the packaging box 1). In this specification, a direction parallel to the corrugated cardboard core 9A will be referred to as a "corrugated direction," and a direction perpendicular to the corrugated direction (corrugated core 9A) will be referred to as a "flow direction." "X" shown in the drawings indicates the "stage direction" and "Y" indicates the "flow direction." In addition, in this specification, "upper (top)", "lower (bottom)" and similar terms refer to the upper (top), lower (bottom) and the like in the assembled state (assembled state) of the packaging box 1. It refers to concepts similar to.

[blank]
As shown in FIG. 2, the blank 5 includes a pair of first outer walls 10A, a pair of second outer walls 10B, a pair of lower outer flaps 11A, a pair of lower inner flaps 11B, and a pair of first upper flaps 12A. and a pair of second upper flaps 12B.

<First outer wall, second outer wall>
The pair of first outer walls 10A and the pair of second outer walls 10B are alternately connected via the first folding line L1. The first outer wall 10A is formed into a substantially rectangular shape that is wider in the flow direction than the second outer wall 10B. An outer passage piece 13 is connected to one end of the first outer wall 10A in the flow direction via a first folding line L1. Furthermore, an outer cutting line 31 for opening the outlet 30 (see FIG. 7) is formed in the first outer wall 10A sandwiched between the pair of second outer walls 10B. The outer cutting line 31 is formed into a substantially U-shape by a pair of zippers 31A extending downward from the upper end of the first outer wall 10A and a score line 31B formed to connect the lower ends of the pair of zippers 31A. ing.

<Lower outer flap, lower inner flap>
The pair of lower outer flaps 11A are connected to the lower ends (one end in the step direction) of the pair of first outer walls 10A via the second folding line L2. The lower outer flap 11A is formed into a substantially rectangular shape having substantially the same width as the flow direction dimension of the first outer wall 10A. The dimension in the step direction (extension dimension) of the lower outer flap 11A is set to approximately half the dimension in the flow direction of the second outer wall 10B. The pair of lower inner flaps 11B are connected to the lower end portions of the pair of second outer walls 10B via the second folding line L2. The lower inner flap 11B is formed into a substantially rectangular shape having substantially the same width as the flow direction dimension of the second outer wall 10B. The dimension (extension dimension) of the lower inner flap 11B in the step direction is approximately the same as the extension dimension of the lower outer flap 11A.

<First upper flap, second upper flap>
The pair of first upper flaps 12A are connected to the upper ends (the other ends in the step direction) of the pair of first outer walls 10A via the folding line L3, and the pair of second upper flaps 12B are connected via the folding line L3. It is connected to the upper end portions of the pair of second outer walls 10B. The dimension of the first upper flap 12A in the flow direction is approximately the same as the dimension of the first outer wall 10A in the flow direction, and the dimension (extension dimension) of the first upper flap 12A in the step direction is the same as the dimension of the first outer wall 10A in the step direction. It is set slightly shorter than the actual size. The dimension of the second upper flap 12B in the flow direction is approximately the same as the dimension of the second outer wall 10B in the flow direction, and the dimension of the second upper flap 12B in the step direction (extension dimension) is the extension dimension of the first upper flap 12A. The dimensions are approximately the same. The pair of first upper flaps 12A and the pair of second upper flaps 12B are arranged alternately along a normal fold line L4 extending from the boundary line (first fold line L1) between the first outer wall 10A and the second outer wall 10B. They are installed consecutively.

A first recess 15A is formed in the first upper flap 12A from its tip (free end) toward the folding line L3. The first recess 15A is depressed in a substantially trapezoidal shape near the center of the first upper flap 12A in the flow direction. Therefore, the first upper flap 12A is formed in a substantially U-shape. An inner passage piece 14 is connected to one end of the first upper flap 12A in the flow direction via a normal fold line L4. Further, an inner cutting line 32 for opening the outlet 30 is formed on the first upper flap 12A sandwiched between the pair of second upper flaps 12B. The inner cutting line 32 includes a pair of zippers 32A extending from the folding line L3 toward the tip of the first upper flap 12A, and a pair of zippers 32A extending from the tip of the pair of zippers 32A to the first recess 15A while being curved. The cut line 32B is included. The pair of zippers 32A of the inner cutting line 32 are formed slightly outside the pair of zippers 31A of the outer cutting line 31 in the flow direction.

Similar to the first upper flap 12A, the second upper flap 12B is provided with a second recess 15B, and the second upper flap 12B is formed in a substantially U-shape. The second recess 15B is formed in a substantially trapezoidal shape that is inclined away from the first upper flap 12A where the inner cutting line 32 is formed in the flow direction.

The first upper flap 12A has a pair of first column walls 20A provided on both sides in the flow direction, and a first inner wall 21A provided between the pair of first column walls 20A. Similarly, the second upper flap 12B includes a pair of second column walls 20B and a second inner wall 21B. The first column wall 20A and the second column wall 20B are connected to each other via a regular fold line L4. The first inner wall 21A is connected to the pair of first column walls 20A via the reverse fold line L5, and the second inner wall 21B is connected to the pair of second column walls 20B via the reverse fold line L5. Note that the reverse fold line L5 is formed substantially parallel to the normal fold line L4.

Here, in this specification, for convenience of explanation, the first upper flap 12A and the second upper flap 12B may be collectively referred to as the "upper flap 12", and the first column wall 20A and the second column wall 20B may be collectively referred to as the "upper flap 12". may be collectively referred to as the "column wall 20", the first inner wall 21A and the second inner wall 21B may be collectively referred to as the "inner wall 21", and the first recess 15A and the second recess 15B may be collectively referred to as the "inner wall 21". It may also be referred to as the "recess 15." In addition, only arithmetic numerals are used for these symbols. Similarly, the first outer wall 10A and the second outer wall 10B may be collectively referred to as the "outer wall 10", and only arithmetic numerals are used for the reference numerals. Moreover, in this specification, in order to simplify the explanation, the explanation will focus on the first upper flap 12A and the second upper flap 12B (a pair of upper flaps 12) that are adjacent to each other via one normal fold line L4.

(column wall)
A pair of pillar walls 20 that are connected in the flow direction (circumferential direction of the peripheral wall 1W) via one normal fold line L4 are each formed in a substantially rectangular shape that is elongated in the step direction. Further, the pair of column walls 20 are separated from the pair of outer walls 10 by a cutting line 22. The cutting line 22 is formed substantially in the same straight line as the folding line L3 extending in the flow direction. Note that the inner passage piece 14 described above is separated from the outer passage piece 13 by a cutting line 22.

(inner wall)
The pair of inner walls 21 are connected to the pair of pillar walls 20 (adjacent across the normal fold line L4) via the reverse fold line L5. In other words, the pair of inner walls 21 are continuous with the pair of column walls 20 in between. Further, the pair of inner walls 21 are connected to the pair of outer walls 10 via a folding line L3. A recess 15 is formed in the inner wall 21, and the inner wall 21 is formed into a substantially U-shape. On each inner wall 21, a ruled line L6 extends diagonally from the intersection of the reverse fold line L5 and the cutting line 22 to the corner of the recess 15. That is, the discarded ruled line L6 is inclined from the intersection point toward the tip (recessed portion 15) of the inner wall 21 and away from the reverse fold line L5. A pair of ruled lines L6 formed on the first upper flap 12A are inclined at substantially the same angle. A pair of ruled lines L6 formed on the second upper flap 12B are inclined at mutually different angles. The discarded ruled line L6 closer to the inner cutting line 32 is set to have a larger angle with the reverse fold line L5 than the discarded ruled line L6 farther from the inner cutline 32.

Note that in this specification, folding the corrugated sheet so that the back liner 9C faces inward is called "normal folding," and folding the corrugated sheet so that the front liner 9B faces inward is called "reverse folding." This will be called "folding." Further, the first folding line L1, the second folding line L2, the folding line L3, and the normal folding line L4 are general-purpose ruled lines formed by crushing the corrugated cardboard sheet linearly in the thickness direction from the back liner 9C side. The general-purpose ruled line mainly has the function of normal folding the corrugated cardboard sheet. The reverse fold line L5 is a perforation line in which a plurality of cuts passing through the corrugated cardboard sheet in the thickness direction are arranged at predetermined intervals. The discarded ruled line L6 is a lead ruled line in which a plurality of cuts are arranged at predetermined intervals on a general-purpose ruled line. The perforation blade line (reverse folding line L5) and the lead ruled line (discarded ruled line L6) enable the corrugated board sheet to be folded both forward and backward. The first folding line L1, the normal folding line L4, and the reverse folding line L5 extend in the step direction, and the second folding line L2 and the folding line L3 extend in the flow direction. The above-mentioned type of folding line is just an example, and any type of folding line may be used as long as it is a line for folding a corrugated cardboard sheet.

[Assembling the packaging box]
Next, the process of assembling the packaging box 1 (assembly work) etc. will be described with reference to FIGS. 1, 3 to 7. FIG. 3 is a perspective view showing a state in which the peripheral wall 1W of the packaging box 1 is formed. FIG. 4 is a perspective view showing a state in which the pair of upper flaps 12 have begun to be folded down inside the peripheral wall 1W. FIG. 5 is a perspective view showing a state in which the pair of upper flaps 12 have entered the inside of the peripheral wall 1W. FIG. 6 is a perspective view showing a state in which the prism 23 is formed. FIG. 7 is a perspective view showing the packaging box 1 with the outlet 30 open.

Note that the packaging box 1 may be assembled manually by a worker, or automatically or semi-automatically using a box-making machine. Here, as an example, a case will be described in which a worker assembles the packaging box 1. Further, it is assumed that the blank 5 is folded in half and the packaging box 1 is in a folded state (not shown). Specifically, the pair of outer walls 10 on both sides in the flow direction are folded normally along the first folding line L1, and the outer passage piece 13 is adhered to the inner edge of the second outer wall 10B. Along with the bending of the pair of outer walls 10, the pair of upper flaps 12 on both sides in the flow direction are also folded along the normal fold line L4. The inner side piece 14 is adhered to the inner surface end portion (the inner surface of the column wall 20) of the second upper flap 12B. In addition, as a means for adhering the corrugated paperboard sheet, for example, a hot melt adhesive, a synthetic resin emulsion adhesive, an adhesive tape, or a double-sided tape can be used.

First, as shown in FIG. 3, the worker bends the pair of first outer walls 10A and the pair of second outer walls 10B at a substantially right angle along the first folding line L1. Four outer walls 10 are arranged in succession in the circumferential direction to form a substantially rectangular cylindrical peripheral wall 1W. In this state, the pair of first upper flaps 12A and the pair of second upper flaps 12B are also bent at a substantially right angle along the normal fold line L4 to form a substantially rectangular cylindrical shape.

Next, the worker folds the pair of lower inner flaps 11B inward of the peripheral wall 1W along the second folding line L2, and then bends the pair of lower outer flaps 11A inward of the circumferential wall 1W along the second folding line L2. . Further, the operator applies adhesive tape (not shown) along the abutting portions of the pair of lower outer flaps 11A. As described above, the lower inner flap 11B and the lower outer flap 11A constitute a bottom portion that closes the lower end surface of the peripheral wall 1W. Note that the means for fixing the lower outer flap 11A is not limited to adhesive tape, and for example, an adhesive, double-sided tape, or the like may be used.

Next, the operator folds back the four upper flaps 12 along the folding line L3 to the inside of the peripheral wall 1W. Here, like the peripheral wall 1W, the four upper flaps 12 are continuous in the circumferential direction and form a rectangular tube shape, so it is generally extremely difficult to fold the upper flaps 12 back inside the peripheral wall 1W. . On the other hand, the packaging box 1 according to the first embodiment has a structure that allows the four upper flaps 12 having a rectangular tube shape to be folded back smoothly. In order to simplify the explanation, the following explanation will focus on a pair of upper flaps 12 that are adjacent to each other via one normal fold line L4.

As shown in FIG. 4, for example, when a worker folds down the pair of upper flaps 12 inside the peripheral wall 1W, the pair of inner walls 21 are reversely folded along the discarded ruled line L6 and are folded along the folding line L3. It is folded back inside. In the process of folding back the pair of inner walls 21, the pillar walls 20 of the pair of upper flaps 12 are folded normally along the pair of reverse folding lines L5 while maintaining the state of being folded normally along the normal folding line L4. As shown in FIG. 5, when the folding of the pair of inner walls 21 further progresses, the pair of pillar walls 20 that have been folded normally along the normal fold line L4 are reversely folded along the pair of reverse fold lines L5 and are placed inside the peripheral wall 1W. enter in.

As shown in FIG. 6, when the pair of upper flaps 12 (inner walls 21) are folded back approximately 180 degrees, the pair of inner walls 21 reversely folded along the discarded line L6 are returned to a flat state and overlap the inner sides of the pair of outer walls 10. become a state. In this state, the pair of column walls 20 are reversely folded at a substantially right angle with respect to the adjacent inner wall 21 along a reverse fold line L5, and are folded normally at a substantially right angle along a normal fold line L4, with the normal fold line L4 being placed inside the peripheral wall 1W. A protruding prism 23 is formed. Further, in this state, the pair of column walls 20 are maintained in a state in which a square column 23 is formed. Further, the lower end of the square column 23 (the tip of the column wall 20) is in contact with the lower inner flap 11B (bottom).

The operator forms four prisms 23 at the four inner corners of the peripheral wall 1W by folding the four upper flaps 12 inward of the peripheral wall 1W along the folding line L3 using the same procedure as above (see FIG. (see 1). In the packaging box 1 according to the present embodiment, the four upper flaps 12 are all (four) connected to the outer wall 10, and the four pairs of pillar walls 20 forming the square pillar 23 and the four inner walls 21 are arranged around the periphery. Since they are arranged alternately in the direction, when a pair of upper flaps 12 are folded back, the adjacent upper flaps 12 are also dragged and folded back. According to this configuration, the four upper flaps 12 can be folded back continuously, and the four prisms 23 can be formed easily and quickly.

Through the above steps, the assembly work of the packaging box 1 is completed (see FIG. 1). Note that the inner cutting line 32 of the first upper flap 12A is arranged so as to overlap the outer cutting line 31 of the first outer wall 10A. As shown in FIG. 7, the first outer wall 10A is cut along the outer cutting line 31, and the first upper flap 12A is cut along the inner cutting line 32, so that the front side of the packaging box 1 has an ejection opening. 30 opens. Furthermore, other packaging boxes 1 can be stacked on top of the four prisms 23 of this packaging box 1. The lower packaging box 1 can receive the load from the upper packaging box 1 by the four prisms 23.

According to the packaging box 1 according to the first embodiment described above, the pair of inner walls 21 are reversely folded along the discarded ruled line L6, so that the peripheral wall 1W remains bent while the pair of pillar walls 20 is bent along the normal fold line L4. It can be folded inside. In addition, as the pair of upper flaps 12 (inner walls 21) were folded back, the pair of column walls 20 were naturally reversely folded along a pair of reverse bending lines L5 to form a square column 23. According to this configuration, the prisms 23 can be easily formed at the inner corners of the peripheral wall 1W by simply folding back the pair of inner walls 21 inside the peripheral wall 1W. Furthermore, since the pair of inner walls 21 overlap the inner sides of the pair of outer walls 10, it is possible to maintain the state in which the square columns 23 are formed at the inner corners of the peripheral wall 1W without providing a structure for locking the column walls 20. .

Moreover, according to the packaging box 1 according to the first embodiment, since the lower end of the prism 23 contacts the lower inner flap 11B, the load applied to the prism 23 is transferred to the bottom of the packaging box 1 (lower inner flap 11B, lower outer flap 11A). ) can be communicated. Thereby, the load-bearing performance of the packaging box 1 can be improved compared to the case where the lower end of the prism 23 is spaced apart from the lower inner flap 11B.

In the packaging box 1 according to the first embodiment, the pair of inner walls 21 are reversely folded along the discarded ruled line L6 and folded back inside the peripheral wall 1W (see FIGS. 4 and 5). It is not limited to this. The operator can also fold back the pair of inner walls 21 inside the peripheral wall 1W while normally folding them along the ruled line L6 (not shown).

Further, in the packaging box 1 according to the first embodiment, the pair of ruled lines L6 are formed on the pair of inner walls 21, but the present invention is not limited to this. The ruled line L6 may be formed on at least one of the pair of inner walls 21 (not shown).

Further, in the packaging box 1 according to the first embodiment, the pair of discarded ruled lines L6 formed on the second upper flap 12B are inclined at mutually different angles with respect to the reverse fold line L5, but the invention is not limited to this, for example. , may be inclined at the same angle with respect to the reverse fold line L5 (not shown). Each discarded ruled line L6 only needs to be inclined with respect to the folding line L3 and the reverse folding line L5, and the angle of inclination can be freely set.

Further, in the packaging box 1 according to the first embodiment, the ruled line L6 is formed in a straight line, but is not limited to this, and may be slightly bent or curved, for example (not shown).

In addition, in the packaging box 1 according to the first embodiment, one ruled line L6 extends from the intersection of the reverse fold line L5 and the cutting line 22, but the present invention is not limited to this, and a plurality of ruled lines L6 extend from the intersection. (not shown). Further, the plurality of ruled lines L6 may be inclined at the same angle or may be inclined at different angles (not shown).

Further, in the packaging box 1 according to the first embodiment, the discarded ruled line L6 extends from the intersection of the reverse fold line L5 and the cutting line 22, but the present invention is not limited to this. The discarded ruled line L6 may extend from near the intersection of the reverse fold line L5 and the cutting line 22, which is slightly shifted from the intersection. "Near the intersection" does not require that the ruled line L6 (or its extension) touch the intersection, but rather allows it to be slightly away from the intersection.

Further, in the packaging box 1 according to the first embodiment, the reverse fold line L5 is formed substantially parallel to the normal fold line L4, but the present invention is not limited to this. For example, the reverse fold line L5 may be inclined with respect to the normal fold line L4 (not shown). In this case, the reverse fold line L5 may be inclined upward so as to approach the normal fold line L4, or may be inclined upward so as to be separated from the normal fold line L4.

Further, in the packaging box 1 according to the first embodiment, the pair of pillar walls 20 adjacent to each other with the normal fold line L4 in between are formed into rectangular shapes having substantially the same size, but the present invention is not limited to this. The sizes (widths in the flow direction) of the pair of pillar walls 20 may be different from each other (see packaging box 3 according to a third embodiment (see FIG. 10, etc.) described later).

Further, in the packaging box 1 according to the first embodiment, the outer cutting line 31 was formed on the first outer wall 10A, and the inner cutting line 32 was formed on the first upper flap 12A, but the present invention is not limited to this. . The outer cutting line 31 may be formed on at least one of the four outer walls 10, and the inner cutting line 32 may be formed on at least one of the four upper flaps 12. Further, the outer cutting line 31 and the inner cutting line 32 are not limited to zippers or perforation lines, but may be any line for cutting the corrugated cardboard sheet. Further, the outer cutting line 31 and the inner cutting line 32 may be omitted (deleted) if unnecessary.

[Second embodiment]
Next, a packaging box 2 according to a second embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a plan view showing the blank 6 of the packaging box 2. FIG. 9 is a perspective view showing the packaging box 2. In addition, in the following description, the same code|symbol is attached|subjected to the structure same as or corresponding to the packaging box 1 based on 1st Embodiment, and the same description is abbreviate|omitted.

As shown in FIG. 8, in the packaging box 2 (blank 6) according to the second embodiment, the extension dimension of the first upper flap 12A and the second upper flap 12B is the height of the peripheral wall 2W (the first outer wall 10A, The dimension of the second outer wall 10B in the step direction is set shorter than that of the second outer wall 10B. As shown in FIG. 9, when the packaging box 2 is assembled (the upper flap 12 is folded inward), the lower end of the square column 23 (the tip of the column wall 20) is separated from the lower inner flap 11B (bottom). ing.

According to the packaging box 2 according to the second embodiment, the column walls 20 constituting the square columns 23 are formed lower than the outer wall 10 (shorter in the step direction), so the area of the blank 6 can be reduced. As a result, the area of the corrugated paperboard sheet required for manufacturing the blank 6 becomes smaller, so that the manufacturing cost of the packaging box 2 (blank 6) can be reduced.

[Third embodiment]
Next, a packaging box 3 according to a third embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a plan view showing the blank 7 of the packaging box 3. FIG. 11 is a perspective view showing the packaging box 3. In the following description, the same or corresponding configurations as those of the packaging boxes 1 and 2 according to the first and second embodiments are denoted by the same reference numerals, and similar descriptions will be omitted.

As shown in FIG. 10, in the blank 7 of the packaging box 3 according to the third embodiment, the outer cutting line 31, the inner cutting line 32, the first recess 15A, and the second recess 15B are omitted. The ruled line L6 extends diagonally from the base end of the reverse fold line L5 (intersection with the cutting line 22) to the tip of the upper flap 12. The inclination angles (angles formed with the reverse fold line L5) of the plurality of discarded ruled lines L6 are substantially the same. Further, in this blank 7, the sizes (widths in the flow direction) of a pair of adjacent column walls 20 with the normal fold line L4 in between are different from each other. Specifically, the second column wall 20B of the second upper flap 12B is formed wider in the flow direction than the first column wall 20A of the first upper flap 12A. Further, the extension dimension of the upper flap 12 is set shorter than the height of the peripheral wall 3W.

Further, a pair of protrusions 24 are provided on a pair of pillar walls 20 adjacent to each other with the normal fold line L4 in between so as to bite into the pair of outer walls 10. Note that the folding line L3 is not formed on the protrusion 24. The amount of protrusion of the protrusion 24 is set to be approximately the same as the thickness of the corrugated cardboard sheet. The pair of protrusions 24 are arranged consecutively across the normal fold line L4, and are separated from the pair of outer walls 10 by a substantially U-shaped (U-shaped) cutting line 22. On the other hand, a pair of engagement holes 25 are bored in the bases of both ends in the flow direction of each lower outer flap 11A (along the second folding line L2). The engagement hole 25 is cut into a rectangular shape that is substantially similar to the cross-sectional shape of the square column 23.

As shown in FIG. 11, when the pair of inner walls 21 are folded back inside the peripheral wall 3W, the pair of protrusions 24 are hollowed out from the pair of outer walls 10 along the cutting line 22, and the pair of inner walls 21 ( It protrudes above the folding line L3). That is, the pair of protrusions 24 protrude from the upper ends of the square columns 23 (the pair of column walls 20). Note that a recess is formed at the upper corner portion of the pair of outer walls 10 by hollowing out the pair of protrusions 24 . Further, the lower end of the square column 23 is spaced apart from the lower inner flap 11B.

Furthermore, an engagement hole 25 is opened at the bottom of the packaging box 3 at a position corresponding to the square column 23. In a state in which a plurality of packaging boxes 3 are stacked, the pair of protrusions 24 of the lower packaging box 3 engage with the engagement holes 25 of the upper packaging box 3 (not shown). According to this configuration, horizontal displacement of the stacked packaging boxes 3 can be suppressed. Thereby, the state in which the plurality of packaging boxes 3 are stacked can be appropriately maintained.

In addition, in the packaging box 3 according to the third embodiment, the amount of protrusion of the protrusion 24 is approximately the same as the thickness of the corrugated cardboard sheet, but the amount of protrusion of the protrusion 24 is not limited to this. It can be large (long). In this case, the engagement hole 25 is formed not only in the lower outer flap 11A but also in the lower inner flap 11B.

Further, in the packaging box 3 according to the third embodiment, the second column wall 20B is formed wider than the first column wall 20A, but the second column wall 20B is wider than the first column wall 20A. The width may be narrower, or the width may be the same as that of the first column wall 20A (neither is shown). Further, the extension dimension of the upper flap 12 may be approximately the same as the height of the peripheral wall 3W, and the lower end of the square column 23 may abut against the lower inner flap 11B (not shown).

[Fourth embodiment]
Next, a packaging box 3 according to a fourth embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a plan view showing the blank 8 of the packaging box 4. FIG. 13 is a perspective view showing the packaging box 4. In the following description, the same reference numerals are given to the same or corresponding structures as those of the packaging boxes 1 to 3 according to the first to third embodiments, and the same description will be omitted.

As shown in FIG. 12, in the blank 8 of the packaging box 4 according to the fourth embodiment, the outer cutting line 31, the inner cutting line 32, the first recess 15A, and the second recess 15B are omitted. The discarded ruled line L6 extends obliquely from the base end of the reverse fold line L5 to the tip of the upper flap 12. The inclination angles (angles formed with the reverse fold line L5) of the plurality of discarded ruled lines L6 are substantially the same. Further, the dimension of the upper flap 12 in the step direction is set shorter than the height of the peripheral wall 3W.

Furthermore, a pair of convex pieces 26 are formed on the pair of outer walls 10 so as to bite into the pair of column walls 20 (adjacent across the normal fold line L4). A protruding piece cutting line 27 that separates the pair of protruding pieces 26 is formed on the boundary line between the pair of protruding pieces 26 . A pair of open fold lines L7 (general-purpose ruled lines) extending obliquely from the lower end of the convex piece cutting line 27 to both ends of the cutting line 22 are formed on the pair of outer walls 10. The pair of convex pieces 26 are formed into a generally pentagonal shape as a whole. Each convex piece portion 26 has a substantially triangular portion formed between the convex piece cutting line 27 and the open fold line L7, and a substantially rectangular portion formed between the convex piece cutting line 27 and the cutting line 22. It is formed into a substantially trapezoidal shape. The amount of protrusion of the upper portion (substantially rectangular portion) of the convex piece portion 26 is set to be approximately the same as the thickness of the corrugated cardboard sheet. Further, the pair of column walls 20 are separated from the pair of protruding pieces 26 by a substantially U-shaped (U-shaped) cutting line 22 .

As shown in FIG. 13, in a state where the pair of inner walls 21 are folded back inside the peripheral wall 4W, the upper portions of the pair of convex pieces 26 are hollowed out from the pair of column walls 20 along the cutting line 22 and formed into prismatic columns. Protrude above 23. Note that a recess is formed in the upper part of the square column 23 by hollowing out the pair of convex pieces 26 . Further, the lower end of the square column 23 is spaced apart from the lower inner flap 11B.

In a state in which a plurality of packaging boxes 4 are stacked, the lower corner portion of the upper packaging box 4 enters inside four protruding pieces 26 provided squarely on the lower packaging box 4 (not shown). According to this configuration, horizontal displacement of the stacked packaging boxes 4 can be suppressed.

If it is difficult to insert the lower corner of the upper packaging box 4 into the four protruding pieces 26 protruding from the squares of the lower packaging box 4, insert the lower corner of the upper packaging box 4 into a pair of protruding pieces separated by the protruding piece cutting line 27. 26 may be bent outward along a pair of open fold lines L7. This prevents the convex piece 26 of the lower packaging box 4 from interfering with the lower corner of the upper packaging box 3, so that a plurality of packaging boxes 4 can be easily stacked. Furthermore, after stacking the upper packaging boxes 4, the convex piece portion 26 broken at the opening fold line L7 can be returned to its original state, thereby maintaining the stacked state of the plurality of packaging boxes 4.

In addition, in the packaging box 4 according to the fourth embodiment, the pair of convex pieces 26 are cut along the convex piece cutting line 27 and bent at the pair of open fold lines L7, but the present invention is not limited to this. Not limited. The protruding piece cutting line 27 and the pair of open fold lines L7 may be omitted, and the pair of protruding pieces 26 may be connected via the first folding line L1 (not shown).

In the packaging boxes 1 to 4 according to the first to fourth embodiments, the four upper flaps 12 are arranged in a row in the circumferential direction, and the pair of pillar walls 20 located at the squares of the peripheral walls 1W to 4W are connected to the four inner walls. 21, but the present invention is not limited thereto. For example, as shown in FIG. 14, each upper flap 12 (inner wall 21) may be divided into two, and a pair of column walls 20 and a pair of inner walls 21 may be provided at each corner of the peripheral wall 1W (first (Variation example). In addition, in FIG. 14, the features of the first modification were applied to the packaging box 1 according to the first embodiment, but the features of the first modification were applied to the packaging boxes 2 to 4 according to the second to fourth embodiments. (not shown).

Further, in the packaging boxes 1 to 4 according to the first to fourth embodiments, four square pillars 23 are formed on the peripheral walls 1W to 4W, but the present invention is not limited to this. For example, as shown in FIG. 15, a pair of upper flaps 12 may be connected to the upper end portions of at least a pair of adjacent outer walls 10 out of the four outer walls 10 via a folding line L3 (second modification example). ). In other words, it is sufficient that the square pillar 23 is formed in any one of the squares of the peripheral walls 1W to 4W. Even in this case, the prism 23 functions as a reinforcing member. In addition, in FIG. 15, the features of the second modification were applied to the packaging box 1 according to the first embodiment, but the features of the first modification were applied to the packaging boxes 2 to 4 according to the second to fourth embodiments. (not shown).

Further, in the packaging boxes 1 to 4 according to the first to fourth embodiments, the pair of lower outer flaps 11A and the pair of lower inner flaps 11B constitute the bottom of the packaging boxes 1 to 4, but the present invention is not limited to this. For example, the bottom of the packaging box may be composed of a single bottom plate (not shown). Further, although the tips of the pair of lower outer flaps 11A are butted against each other, the present invention is not limited to this, and the tips of the pair of lower outer flaps 11A may be spaced apart from each other. In other words, the lower end surfaces of the peripheral walls 1W to 4W do not need to be completely closed, but only need to be partially closed.

Further, in the packaging boxes 1 to 4 according to the first to fourth embodiments, the peripheral walls 1W to 4W are formed in a cylindrical shape with a rectangular cross section, but are not limited to this, and may be formed in a cylindrical shape with a triangular cross section, for example. (not shown).

Further, although the packaging boxes 1 to 4 according to the first to fourth embodiments are formed of paper double-sided corrugated sheets, the present invention is not limited thereto. For example, the corrugated cardboard sheet may be a single-sided corrugated cardboard sheet in which a liner is attached to one side of the core board 9A, or a double-sided corrugated cardboard sheet in which a single-sided corrugated cardboard sheet is attached to a double-sided corrugated sheet. Further, for example, the packaging box 1 may be formed of cardboard, a resin board, or the like instead of a paper cardboard sheet.

Note that the description of the above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment. The present invention may be variously changed, replaced, and modified without departing from the spirit of the technical idea, and the scope of the claims includes all embodiments that can be included within the scope of the technical idea.

1, 2, 3, 4 Packaging box 1W, 2W, 3W, 4W Peripheral wall 10A (10) 1st outer wall (outer wall)
10B (10) Second outer wall (outer wall)
11A Lower inner flap (bottom)
11B Lower outer flap (bottom)
12A (12) First upper flap (upper flap)
12B (12) Second upper flap (upper flap)
20A (20) 1st pillar wall (pillar wall)
20B (20) 2nd pillar wall (pillar wall)
21A (21) First inner wall (inner wall)
21B (21) Second inner wall (inner wall)
22 Cutting line 23 Prismatic 24 Projection 25 Engagement hole 26 Convex piece 27 Convex piece cutting line L3 Folding line L4 Regular fold line L5 Reverse fold line L6 Discarded ruled line L7 Open fold line

Claims (6)

A peripheral wall (1W, 2W, 3W, 4W) formed into a rectangular tube shape by connecting a plurality of outer walls (10) in the circumferential direction;
a pair of flaps (12) connected to the upper ends of at least a pair of adjacent outer walls among the plurality of outer walls via a folding line (L3);
a bottom portion (11A, 11B) that closes a lower end surface of the peripheral wall ;
The pair of said flaps are
a pair of pillar walls (20) connected in the circumferential direction via a regular fold line (L4) extending from the boundary line of the pair of outer walls;
a pair of inner walls (21) connected to the pair of pillar walls via a reverse fold line (L5), and connected to the pair of outer walls via the fold line;
The pair of pillar walls are separated from the pair of outer walls by a cutting line (22);
At least one of the pair of inner walls has a ruled line (L6) extending diagonally from the vicinity of the intersection of the reverse fold line and the cutting line,
In the process of folding the pair of inner walls inside the peripheral wall along the folding line while at least one of the pair of inner walls is folded along the regular ruled line, the pair of inner walls are folded along the normal fold line. The column wall enters the inner side of the peripheral wall while being reversely folded along the pair of reverse fold lines,
The inner walls folded along the ruled lines are returned flat, and the pair of inner walls are overlapped with the inner sides of the outer walls, so that the pair of columns are reversely folded along the pair of reverse fold lines. The wall is held in a state in which the normal fold line protrudes inside the peripheral wall to form a prism (23) ,
A pair of protrusions (24) are provided on the pair of pillar walls so as to bite into the pair of outer walls,
An engagement hole (25) is bored in the bottom at a position corresponding to the prism,
In a state where the pair of inner walls are folded back inside the peripheral wall, the pair of protrusions are hollowed out from the pair of outer walls along the cutting line and protrude above the pair of inner walls,
A packaging box characterized in that, in a state in which a plurality of the packaging boxes are stacked, the pair of projections of the lower packaging box engage with the engagement holes of the upper packaging box. A peripheral wall (1W, 2W, 3W, 4W) formed into a rectangular tube shape by connecting a plurality of outer walls (10) in the circumferential direction;
A pair of flaps (12) connected to the upper ends of at least a pair of adjacent outer walls among the plurality of outer walls via a folding line (L3),
The pair of said flaps are
a pair of pillar walls (20) connected in the circumferential direction via a regular fold line (L4) extending from the boundary line of the pair of outer walls;
a pair of inner walls (21) connected to the pair of pillar walls via a reverse fold line (L5), and connected to the pair of outer walls via the fold line;
The pair of pillar walls are separated from the pair of outer walls by a cutting line (22);
At least one of the pair of inner walls has a ruled line (L6) extending diagonally from the vicinity of the intersection of the reverse fold line and the cutting line,
In the process of folding the pair of inner walls inside the peripheral wall along the folding line while at least one of the pair of inner walls is folded along the regular ruled line, the pair of inner walls are folded along the normal fold line. The column wall enters the inner side of the peripheral wall while being reversely folded along the pair of reverse fold lines,
The inner walls folded along the ruled lines are returned flat, and the pair of inner walls are overlapped with the inner sides of the outer walls, so that the pair of columns are reversely folded along the pair of reverse fold lines. The wall is held in a state in which the normal fold line protrudes inside the peripheral wall to form a prism (23),
A pair of convex pieces (26) are formed on the pair of outer walls so as to bite into the pair of column walls,
In a state where the pair of inner walls are folded back inside the peripheral wall, the upper portions of the pair of convex pieces are hollowed out from the pair of pillar walls along the cutting line and protrude above the square pillars. A packaging box featuring: A convex piece cutting line (27) separating the pair of convex piece parts is formed on the boundary line of the pair of convex piece parts,
The packaging box according to claim 2 , wherein the pair of outer walls are formed with a pair of open fold lines (L7) extending diagonally from the lower end of the protruding piece cutting line to both ends of the cutting line. . further comprising a bottom portion (11A, 11B) that closes a lower end surface of the peripheral wall;
The packaging box according to any one of claims 1 to 3 , wherein a lower end of the prism contacts the bottom. further comprising a bottom portion (11A, 11B) that closes a lower end surface of the peripheral wall;
The packaging box according to any one of claims 1 to 3 , wherein a lower end of the prism is spaced apart from the bottom. The plurality of flaps are connected to all the outer walls,
The packaging box according to any one of claims 1 to 5 , wherein the plurality of pairs of pillar walls and the plurality of inner walls forming the prism are arranged alternately in a circumferential direction. .

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