JP7220956B2 - packaging box - Google Patents

Description

TECHNICAL FIELD The present invention relates to a packaging box capable of protecting corners of an object to be packaged.

Patent Literature 1 discloses an assembly box provided with a cushioning portion for holding an object to be packed. The cushioning portion is formed at the corner inside the assembly box when the inner flap is divided into two and the divided inner flaps are folded. The cushioning portion is formed in the shape of a hollow triangular prism, and the upper surface of the cushioning portion is provided with a concave portion into which the corner of the object to be packed is fitted.

JP-A-2000-326959

However, in the assembly box described above, in order to form the triangular prism-shaped cushioning portion, it is necessary to fold a large number of divided portions of the inner flap in a predetermined order. Therefore, in the assembly box described above, the cushioning portion could not be easily assembled.

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a packaging box in which a cushioning structure can be easily formed.

In order to achieve the above-described object, a packaging box according to the present invention includes a peripheral wall formed by alternately connecting a pair of first side walls and a pair of second side walls, and end portions of the pair of first side walls. a pair of inner flaps that are connected to the inner wall and can be bent inward; and a pair of outer flaps that partially or fully closes, the inner flaps having at least one cushioning portion forming a cushioning structure for protecting the corners of the object to be packaged, the cushioning portion comprising: A first planar portion formed in a right-angled triangle in which a boundary with the first side wall and one side of the inner flap along the second side wall form a right angle, and a normal folding line on an oblique side common to the first planar portion At least one of two sides forming a right angle of a second flat portion formed by a right-angled triangle which is continuous with the normal fold line and which is symmetrical with the first flat portion with respect to the normal fold line, and two sides forming a right angle of the second flat portion. and a side portion connected to the second plane portion via a reverse fold line, and in the process of folding the second plane portion along the normal fold line and stacking it on the first plane portion, the side portion is the While slidably contacting the back surface of at least one of the first side wall and the second side wall, it is bent along the reverse folding line, and pressed against the back surface of at least one of the first side wall and the second side wall. Thus, the second plane portion is held in a layered state in which it is layered on the first plane portion, and the second plane portion in the layered state and the side portion in the pressure contact state are connected to the object to be packaged. The corners of the object to be packaged are protected by touching the corners.

In this case, the inner flap is formed with a connection surface portion projecting from the boundary with the first side wall toward the tip of the inner flap, and the buffer portion extends from the tip of the inner flap to the connection surface portion. It is preferable that the first plane portion is formed by dividing the inner flap along a cutting line, and that the first plane portion is continuously provided to the first side wall and the connecting surface portion.

In this case, the side surface portion is connected to one side forming a right angle of the second flat surface portion via the reverse folding line and overlaps the back surface of the first side wall, and the second flat surface portion. It is preferable that a second side surface portion is continuously provided via the reverse fold line to the other side forming a right angle with the second side surface portion and overlaps the back surface of the second side wall.

In this case, the peripheral wall, the inner flap, and the outer flap are made of corrugated cardboard sheets, and the corrugated cardboard sheets are crushed in the thickness direction in the free end side area opposite to the reverse folding line of the side surface. It is preferable that a stepped portion is formed.

According to the present invention, a buffer structure can be easily formed.

It is a perspective view showing a packaging box concerning one embodiment of the present invention. 1 is a plan view showing a blank of a packaging box according to one embodiment of the present invention; FIG. FIG. 4 is a plan view showing an enlarged part of the blank of the packaging box according to one embodiment of the present invention; It is a perspective view which shows the buffer part of the packaging box which concerns on one Embodiment of this invention. FIG. 4 is a perspective view illustrating a process of forming a cushioning structure of the packaging box according to one embodiment of the present invention; It is a perspective view which shows the buffer structure of the packaging box which concerns on one Embodiment of this invention. FIG. 4 is a perspective view illustrating a process of housing an object to be packaged in the packaging box according to one embodiment of the present invention; FIG. 4 is a cross-sectional view illustrating the relationship between the cushioning structure of the packaging box and the corner of the object to be packaged according to one embodiment of the present invention;

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates " "Upper" and "D" indicate "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. Terms indicating direction and position are used in this specification, but these terms are used for convenience of description and are not intended to limit the technical scope of the present invention.

[Overview of packaging box]
The configuration of the packaging box 1 will be described with reference to FIGS. 1 and 2. FIG. 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. FIG.

As shown in FIG. 1, the packaging box 1 is formed in a substantially rectangular parallelepiped shape. The packaging box 1 is an A-type box that is sealed by closing the upper end surface and the lower end surface of a substantially rectangular tubular peripheral wall 1W. A substantially rectangular parallelepiped object 90 is accommodated inside the packaging box 1 (see FIG. 7).

The packaging box 1 is formed by assembling blanks 5 shown in FIG. The packaging box 1 (blank 5) is formed of a double-faced corrugated cardboard sheet made of paper, for example, by attaching a front liner 9B and a back liner 9C (see FIG. 4) to the front and back of a corrugated medium 9A. The blank 5 is formed, for example, by punching out a cardboard sheet with a die or the like. 2 (and FIG. 3) show the front liner 9B side (the outer surface side of the packaging box 1). In this specification, the direction parallel to the core 9A of the corrugated cardboard is called the "corrugation direction", and the direction perpendicular to the corrugation direction (the core 9A) is called the "flow direction". The "X" shown in the drawings indicates the "row direction", and the "Y" indicates the "flow direction". Moreover, in this specification, terms indicating directions and positions refer to directions and positions in the assembled state (assembled state) of the packaging box 1 .

[blank]
As shown in FIG. 2, the blank 5 includes a pair of first sidewalls 10A, a pair of second sidewalls 10B, a pair of upper inner flaps 11, a pair of upper outer flaps 12, and a pair of lower inner flaps 13 ( inner flaps) and a pair of lower outer flaps 14 (outer flaps).

<End wall, side wall>
The pair of first side walls 10A and the pair of second side walls 10B are alternately connected from one side to the other in the flow direction via the first folding line L1. The first side wall 10A and the second side wall 10B are formed in a substantially rectangular shape. Specifically, the second side wall 10B is formed in a substantially rectangular shape longer in the flow direction than the first side wall 10A. A passage piece 15 is connected to the other end of the second side wall 10B in the flow direction via the first ruled line L1.

<Upper inner flap, upper outer flap>
The pair of upper inner flaps 11 are connected to one end (upper end) in the step direction of the pair of first side walls 10A via a second folding line L2. The upper inner flap 11 is formed in a substantially rectangular shape, and its dimension in the step direction (extending dimension) is set to be approximately half of the dimension in the flow direction of the first side wall 10A. The pair of upper and outer flaps 12 are connected to one end (upper end) in the step direction of the pair of second side walls 10B via a second folding line L2. The upper and outer flaps 12 are formed in a substantially rectangular shape, and their stepwise dimension (extending dimension) is substantially the same as the extending dimension of the upper inner flap 11 .

<Lower inner flap, lower outer flap>
The pair of lower inner flaps 13 are connected to the other end (lower end) in the step direction of the pair of first side walls 10A via a third folding line L3. Each lower inner flap 13 has two cushioning portions 17 forming a cushioning structure 18 for protecting the corner portion 91 of the package 90, which will be described later in detail. The lower inner flap 13 is formed to have substantially the same shape as the upper inner flap 11 . A substantially M-shaped notch (recess) is recessed from the distal end (free end) to the proximal end in the central portion of the lower inner flap 13 in the flow direction. The pair of lower outer flaps 14 are connected to the other end (lower end) in the step direction of the pair of second side walls 10B via a third folding line L3. The lower outer flap 14 is formed in substantially the same shape as the upper outer flap 12 .

Note that the first to third ruled lines L1 to L3 are general-purpose ruled lines formed by flattening the corrugated cardboard sheet linearly in the thickness direction from the back liner 9C side. The general-purpose ruled lines have the function of folding (correctly folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The above-described first to third ruled lines L1 to L3 are not limited to general-purpose ruled lines, and may be any lines for folding corrugated cardboard sheets, such as lead ruled lines in which a plurality of cuts are formed on a general-purpose ruled line at predetermined intervals. .

Next, details of the lower inner flap 13 will be described with reference to FIG. FIG. 3 is a plan view showing an enlarged part of the blank 5. FIG. Since the pair of lower inner flaps 13 have the same structure, one lower inner flap 13 will be described below.

A connection surface portion 16 and a pair of buffer portions 17 are formed on the lower inner flap 13 .

<Connecting surface>
The connecting surface portion 16 is formed to protrude from the third folding line L3 (the boundary with the first side wall 10A) toward the tip of the lower inner flap 13. As shown in FIG. The connection surface portion 16 is formed in a substantially semicircular shape at a substantially central portion of the lower inner flap 13 in the flow direction.

<Buffer part>
The pair of cushioning portions 17 are formed by dividing the lower inner flap 13 along a cutting line 20 extending from the tip (free end) of the lower inner flap 13 to (the vertex of) the connecting surface portion 16 . The cutting line 20 is a line in which a plurality of cuts and a plurality of seams are arranged alternately. Since the pair of cushioning portions 17 are symmetrical with respect to the cutting line 20, one cushioning portion 17 will be described below.

The buffer portion 17 includes a first plane portion 21, a second plane portion 22, a first side portion 23A, and a second side portion 23B.

(First flat portion)
The first flat portion 21 is formed on the base end side of the lower inner flap 13 and on the outside in the flow direction. The first plane portion 21 is formed in a substantially right-angled triangle in which the third folding line L3 and the flow-direction outer edge of the lower inner flap 13 (one side of the lower inner flap 13 along the second side wall 10B in the assembled state) form a right angle. It is The base end of the first plane portion 21 in the step direction is connected to the first side wall 10A via the third folding line L3, and the inner end of the first plane portion 21 in the flow direction is connected to the connecting surface portion 16. .

(Second plane portion)
The second flat portion 22 is connected to the oblique side common to the first flat portion 21 via a regular folding line 25 . In addition, the second plane portion 22 is formed in the shape of a right-angled triangle that is linearly symmetrical with the first plane portion 21 with the normal folding line 25 as an axis. A base end in the step direction of the second flat portion 22 is adjacent to the connecting surface portion 16 via a curved cut 20A.

The normal folding line 25 is formed obliquely between the flow-direction outer edge of the lower inner flap 13 and the connection surface portion 16 . The normal fold line 25 is a line in which a plurality of (eg, three) score lines 25A and a plurality of (eg, two) frame portions 25B are alternately arranged side by side. The score line 25A is a line formed by penetrating a cutting tool in the thickness direction of the corrugated cardboard sheet. The frame portion 25B includes a pair of terminal lines 25C formed at the ends of the scored lines 25A in a direction perpendicular to the scored lines 25A, and a pair of folds formed to connect the ends of the pair of terminal lines 25C. lines 25D and . The terminal line 25C is a line formed by penetrating a cutting tool in the thickness direction of the cardboard sheet. Folding line 25D is a general-purpose ruled line formed parallel to score line 25A.

(First side portion)
The first side surface portion 23</b>A is connected to the flow direction end of the second flat portion 22 (one side forming a right angle of the second flat portion 22 ) via a reverse fold line 26 . The first side surface portion 23A is formed between the reverse fold line 26 and the cutting line 20 and has a right triangle shape with the cutting line 20 as the oblique side. A base end in the step direction of the first side surface portion 23A is adjacent to the connection surface portion 16 via a curved cut 20A. In addition, in the region of the first side surface portion 23A on the side of the cutting line 20 (the region on the free end side opposite to the reverse folding line 26), a corrugated corrugated sheet is formed with a flattened portion 27 in the thickness direction ( See the shaded area in FIG. 3).

(Second side portion)
The second side surface portion 23</b>B is connected to the end portion of the second plane portion 22 in the step direction (the other side forming a right angle of the second plane portion 22 ) via a reverse fold line 26 . The second side surface portion 23B is formed in a right-angled triangle (more precisely, a quadrangle) with the reverse folding line 26 as a hypotenuse. The free end opposite to the reverse folding line 26 of the second side surface portion 23B is aligned with the tip of the lower outer flap 14 . In addition, a stepped portion 27 is formed in a region on the free end side opposite to the reverse folding line 26 of the second side surface portion 23B (see hatched portion in FIG. 3).

The reverse fold line 26 is formed by a reverse ruled line formed by straightly crushing the corrugated cardboard sheet from the front liner 9B side in the thickness direction, and a perforating blade cut on the reverse ruled line. The reverse folding line 26 has a function of folding (reverse folding) the corrugated cardboard sheet so that the front liner 9B faces inward. The reverse fold line 26 is not limited to the above configuration, and may be only a reverse crease line or a perforating blade only, or any other line for folding a corrugated cardboard sheet.

In this specification, the first plane portion 21, the second plane portion 22, the first side portion 23A, and the second side portion 23B are "formed into a right triangle" in the strict sense of the term. It does not require that there be any, but generally means that it is formed into a triangle with one interior angle forming a right angle. In addition, the phrase “the first plane portion 21 and the second plane portion 22 are line-symmetrical” does not strictly mean that they are line-symmetrical, but means that some errors are allowed.

[Assembling the packaging box]
Next, the assembly procedure (sealing procedure) of the packaging box 1 will be described with reference to FIGS. 1 and 4 to 8. FIG. FIG. 4 is a perspective view showing the buffer portion 17. As shown in FIG. FIG. 5 is a perspective view explaining the process of forming the buffer structure 18. FIG. FIG. 6 is a perspective view showing the cushioning structure 18. As shown in FIG. FIG. 7 is a perspective view for explaining the process of housing an object 90 to be packaged in the packaging box 1. FIG. FIG. 8 is a sectional view for explaining the relationship between the cushioning structure 18 and the corner 91 of the package 90. As shown in FIG. The packaging box 1 may be assembled manually by an operator, or may be assembled automatically or semi-automatically by a box making machine. Here, as an example, a case where an operator assembles the packaging box 1 will be described. In addition, as an initial state before assembly of the packaging box 1, the first side wall 10A and the second side wall 10B positioned on both outer sides in the flow direction of the blank 5 are folded along the first folding line L1, and the passage piece 15 is folded at the first folding line L1. 1 side wall 10A, and the packaging box 1 is double-folded.

First, an operator bends the pair of first side walls 10A and the pair of second side walls 10B substantially at right angles along the first folding lines L1 to form a substantially rectangular cylindrical peripheral wall 1W with both upper and lower end faces open. (See FIG. 7).

Subsequently, the operator folds the pair of lower inner flaps 13 toward the inner side of the peripheral wall 1W along the third folding lines L3, and then folds the pair of lower outer flaps 14 toward the inner side of the peripheral wall 1W along the third folding lines L3. fold into In this state, the tip portions of the pair of lower inner flaps 13 are separated, and the tip portions of the pair of lower outer flaps 14 are butted against each other (see FIG. 4). The pair of lower outer flaps 14 overlaps the pair of lower inner flaps 13 and closes the entire opening surface at the lower end of the peripheral wall 1W (see FIGS. 4 and 7). An operator sticks an adhesive tape (not shown) along the butted portions of the pair of lower outer flaps 14 . As described above, the bottom surface of the packaging box 1 is formed.

Next, the worker forms four cushioning structures 18 at the four corners of the bottom surface of the packaging box 1 . Since the procedure for forming the four buffer structures 18 is the same, the procedure for forming one buffer structure 18 will be described below. Further, in the explanation common to the first side wall 10A and the second side wall 10B, the term "side wall 10" is simply used, and only Arabic numerals are used for the reference numerals. Similarly, in the description common to the first side surface portion 23A and the second side surface portion 23B, the term "side surface portion 23" is simply used, and only Arabic numerals are used for the reference numerals.

The operator cuts the lower inner flap 13 along the cutting line 20 to form a pair of cushioning portions 17 . Subsequently, as shown in FIG. 5 , the operator holds the second flat portion 22 of the cushioning portion 17 and folds the second flat portion 22 along the normal folding line 25 so as to overlap the first flat portion 21 . The second plane portion 22 is separated from the first plane portion 21 by the cut line 25A, and is folded at approximately 180 degrees by folding at approximately right angles at each folding line 25D.

Here, as shown in FIG. 5, when the second flat portion 22 begins to be folded back, the outer end of the second side surface portion 23B in the flow direction begins to come into sliding contact with the back surface (back liner 9C) of the second side wall 10B. The second side portion 23B begins to reversely fold along the reverse folding line 26 due to the frictional force. As the folding of the second flat portion 22 progresses, the central side of the flow direction of the first side surface portion 23A begins to come into contact with the back surface (back liner 9C) of the first side wall 10A, and as the folding of the second flat portion 22 progresses, The tip of the first side surface portion 23A in the step direction begins to slide on the back surface of the first side wall 10A, and the frictional force causes the first side surface portion 23A to begin to reversely fold along the reverse folding line 26 . In this manner, as the second plane portion 22 is folded back, the side portion 23 moves while being in contact with the side wall 10 and is naturally (automatically) reverse-folded along the reverse folding line 26 .

As shown in FIG. 6, when the second plane portion 22 is folded back until it overlaps with the first plane portion 21, the first side portion 23A is folded at a substantially right angle along the reverse folding line 26 and overlaps the back surface of the first side surface 10A with pressure. (press contact), and the second side surface portion 23B is folded at a substantially right angle along the reverse folding line 26 and overlaps (presses contact with) the back surface of the second side surface 10B with pressure. In this manner, the side surface portion 23 is pressed against the rear surface of the side wall 10, so that the second flat surface portion 22 is prevented from returning to its original state by the restoring force acting on the fold. That is, the side surface portion 23 has a function of holding the second plane portion 22 in a layered state in which the second plane portion 22 is layered on the first plane portion 21 by being in a pressure contact state. With the above, the cushioning structure 18 for protecting the corner 91 of the package 90 is completed. In addition, the operator folds the other cushioning portions 17 in the same procedure as above to form four cushioning structures 18 at the four corners of the bottom surface of the packaging box 1 (peripheral wall 1W).

In this cushioning structure 18, the second flat portion 22 overlaps the first flat portion 21 to form a double bottom structure. More precisely, since the first flat portion 21 overlaps the lower outer flap 14, the bottom portion of the cushioning structure 18 has a triple bottom structure (see FIGS. 6 and 8). In the cushioning structure 18, the first side portion 23A overlaps the first side wall 10A to form a double bottom structure, and the second side portion 23B overlaps the second side wall 10B to form a double bottom structure. (See Figures 6 and 8).

Next, as shown in FIG. 7, the worker puts the item to be packaged 90 into the packaging box 1 (peripheral wall 1W) from above, and the four lower corners 91 of the item to be packaged 90 are secured to the four cushioning structures. 18. Specifically, as shown in FIG. 8, each corner portion 91 of the item to be packaged 90 is placed on the second flat portion 22 in the stacked state. In addition, the first side surface portion 23A and the second side surface portion 23B, which are in a press-contact state, come into contact with the side surface of the corner portion 91 of the item 90 to be packaged. In this way, the second flat surface portion 22 in the laminated state and the side surface portion 23 in the pressure contact state contact the corner portion 91 (three surfaces constituting the corner portion 91 ) of the item to be packaged 90 , so that the item to be packaged 90 is Protect corners 91 .

Next, the worker covers the four corners 91 of the upper portion of the package 90 with a cushioning material (not shown), and pulls the pair of upper inner flaps 11 along the second folding lines L2 to the inside of the peripheral wall 1W. After folding, the pair of upper and outer flaps 12 are folded inside the peripheral wall 1W along the second folding lines L2 (see FIG. 1). Finally, the operator sticks adhesive tape along the butted portions of the pair of upper and outer flaps 12 .

As described above, the top surface of the packaging box 1 is formed, and the packaging box 1 is in a sealed state (see FIG. 1). The upper and lower outer flaps 12 and 14 may be adhered to the surfaces of the inner flaps 11 and 13 with an adhesive instead of the adhesive tape. When the lower outer flap 14 is adhered to the lower inner flap 13 , an adhesive is applied to the connecting surface portion 16 and the first flat portion 21 so as not to interfere with the bending of the cushioning portion 17 .

In the packaging box 1 according to the present embodiment described above, in the process in which the second flat portion 22 is folded back along the normal folding line 25 and stacked on the first flat portion 21, the side portion 23 is attached to the back surface of the side wall 10. It is configured to be bent along the reverse folding line 26 while being in sliding contact. Further, the second flat portion 22 is held in a laminated state in which the second flat portion 22 is laminated on the first flat portion 21 by pressing the side portion 23 against the rear surface of the side wall 10 with pressure. The second flat portion 22 overlaps the first flat portion 21 to form a double bottom structure, and the side portion 23 overlaps the side wall 10 to form a double wall structure. A buffer structure 18 was formed in the . According to this configuration, the side surface portion 23 automatically comes into pressure contact state by simply folding the second flat surface portion 22 , and the cushioning structure 18 can be formed in the packaging box 1 . In addition, since the second plane portion 22 is held in the laminated state by the side portion 23 being in a press-contact state, it is possible to suppress the dismantling of the cushioning structure 18 due to the restoring force acting on the folds. As described above, the cushioning structure 18 for protecting the corner 91 of the package 90 can be easily formed.

In addition, in the packaging box 1 according to the present embodiment, the connecting surface portion 16 is provided at the base end of the lower inner flap 13, and the pair of first flat portions 21 are continuously provided. If the connecting surface portion 16 is omitted (deleted) and the cutting line 20 is extended from the distal end of the lower inner flap 13 to the proximal end, the lower inner flap 13 is completely divided into two. In this case, when assembling the packaging box 1, the worker has to fold the two-divided lower inner flap 13 separately, which causes a problem that the assembling work cannot be performed quickly. On the other hand, according to the packaging box 1 according to the present embodiment, the cutting line 20 is not formed on the connection surface portion 16 located at the base end of the lower inner flap 13, so that the lower inner flap 13 is separated from the tip end to the base end. can be prevented from being completely split into two. As a result, when assembling the packaging box 1, the operator can fold the entire base of the undivided lower inner flap 13 at once, using the same procedure as for a general lower inner flap without the cutting line 20. Assembly work can be done quickly. As described above, it is preferable that the connection surface portion 16 is provided, but the present invention does not prevent the omission (deletion) of the connection surface portion 16 .

In addition, in the packaging box 1 according to the present embodiment, the second flat portion 22 contacts the bottom surface of the corner portion 91 of the item 90 to be packaged, and the first side portion 23A and the second side portion 23B of the item to be packaged 90 are in contact with each other. It was set as the structure which contacts two adjacent surfaces in the corner|angular part 91. FIG. According to this configuration, the three surfaces forming the corner 91 of the item 90 to be packaged can be protected.

Further, according to the packaging box 1 according to the present embodiment, the flattened portion 27 is formed thinner than other portions, so that when the object 90 to be packaged is accommodated inside the packaging box 1, the flattened portion 27 is formed to be thinner than the other portions. It is possible to prevent the package 90 from interfering with the tip (free end) of the side portion 23 . Thereby, the object to be packaged 90 can be smoothly accommodated inside the packaging box 1 . It does not matter which side of the corrugated cardboard sheet the corrugated sheet 9A is squashed by the corrugated portion 27. ) to crush the medium 9A.

In addition, in the packaging box 1 according to the present embodiment, the first side surface portion 23A and the second side surface portion 23B are continuously provided on two sides forming a right angle of the second flat surface portion 22, but the present invention is limited to this. not. Either one of the first side portion 23A and the second side portion 23B may be omitted (deleted) (not shown). That is, the side surface portion 23 may be connected to at least one side of the two sides forming a right angle of the second plane portion 22 via the reverse folding line 26 . In this case, the side surface portion 23 holds the second flat surface portion 22 in the laminated state by being pressed against the rear surface of at least one of the first side wall 10A and the second side wall 10B. In addition, although the first side surface portion 23A and the second side surface portion 23B are formed in the shape of a right triangle, they may be formed in other shapes such as a triangle shape, a square shape, a semicircle shape, etc., other than the right triangle shape. (not shown).

Moreover, in the packaging box 1 according to the present embodiment, the four buffer portions 17 (buffer structures 18) are provided in order to protect the four corner portions 91 of the rectangular parallelepiped object 90 to be packaged. is not limited to this. The number of buffer portions 17 (buffer structures 18 ) may be increased or decreased according to the shape of the package 90 . For example, only one of the lower inner flaps 13 divided in two by the cutting line 20 may be used as the cushioning portion 17 (not shown).

In addition, in the packaging box 1 according to the present embodiment, the tips of the pair of upper inner flaps 11 and the pair of lower inner flaps 13 are separated from each other, but this is not the only option. may be combined (not shown). Further, the pair of upper and outer flaps 12 and the pair of lower and outer flaps 14 cover the entire opening surface of the peripheral wall 1W, but this is not the only option, and they may be formed so as to cover a part of the opening surface. good (not shown). In other words, the pair of lower outer flaps 14 and the like may be formed such that their tip portions are spaced apart (not shown).

Moreover, although the buffer part 17 (buffer structure 18) was provided in the lower inner flap 13 in the packaging box 1 which concerns on this embodiment, this invention is not limited to this. The cushioning portion 17 may be provided on the upper inner flap 11 instead of the lower inner flap 13 (not shown). When the cushioning portion 17 is provided in the upper inner flap 11, the packaging box 1 is assembled (sealed) by turning it upside down. Alternatively, the cushioning portion 17 may be provided on both the upper inner flap 11 and the lower inner flap 13 (not shown). As a procedure for assembling the packaging box 1 when the cushioning portions 17 are provided on both the upper and lower inner flaps 11 and 13, for example, after the cushioning structure 18 of the lower inner flap 13 is formed and the object to be packaged 90 is accommodated, the upper The cushioning structure 18 of the upper inner flap 11 is formed before folding the inner flap 11 along the second folding line L2. By inserting the side portion 23 into the gap between the side wall 10 and the item 90 to be packaged, the cushioning structure 18 is brought into contact with the upper corner portion 91 of the item 90 to be packaged.

Moreover, although the packaging box 1 according to the present embodiment is a so-called A-type cardboard box, the present invention is not limited to this. For example, the packaging box 1 may be configured in a tray shape by omitting (deleting) the upper inner flap 11 and the upper outer flap 12 and opening the upper end surface of the peripheral wall 1W (not shown).

Moreover, although the packaging box 1 according to the present embodiment is formed of a double-faced cardboard sheet made of paper, the present invention is not limited to this. For example, the corrugated cardboard sheet may be a double-faced corrugated cardboard sheet in which a single-faced corrugated cardboard sheet having a liner attached to one side of the core 9A is laminated to a double-faced corrugated cardboard sheet. Further, for example, the packaging box 1 may be formed of cardboard, a resin plate, or the like, instead of the cardboard sheet made of paper.

It should be noted that the description of the above embodiment shows one aspect of the packaging box and the method of folding the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1 packaging box 1W peripheral wall 10 side wall 10A first side wall 10B second side wall 13 lower inner flap (inner flap)
14 lower outer flap (outer flap)
16 Connection surface portion 17 Cushioning portion 18 Cushioning structure 20 Cutting line 21 First plane portion 22 Second plane portion 23 Side portion 23A First side portion 23B Second side portion 25 Normal folding line 26 Reverse folding line 27 Stepped portion 90 Packaged item 91 Corner L3 Third folding line (boundary)

Claims (4)

a peripheral wall (1W) formed in a cylindrical shape by alternately connecting a pair of first side walls (10A) and a pair of second side walls (10B);
a pair of inner flaps (13) connected to ends of the pair of first side walls and capable of being bent inward;
A pair of outer flaps (14) connected to the ends of the pair of second side walls, folded inward and overlapped with the inner flaps to cover part or all of the opening surface of the peripheral wall,
said inner flap has at least one cushioning portion (17) forming a cushioning structure (18) for protecting a corner (91) of the item to be packaged (90);
The buffer part is
a first plane portion (21) formed in a right-angled triangle in which a boundary (L3) with the first side wall and one side of the inner flap along the second side wall form a right angle;
a second plane portion (22) connected to the oblique side common to the first plane portion through a regular fold line (25) and forming a right-angled triangle symmetrical with the first plane portion with the regular fold line as an axis; ,
a side surface portion (23) connected to at least one side of the two sides forming a right angle of the second plane portion via a reverse folding line (26),
In the process in which the second plane portion is folded back along the normal folding line and stacked on the first plane portion, the side portion is in sliding contact with the rear surface of at least one of the first side wall and the second side wall. While being bent along the reverse folding line, the second flat portion is laminated on the first flat portion by being pressed against the rear surface of at least one of the first side wall and the second side wall with pressure. hold in a stacked state,
A packaging box, wherein the second flat portion in a stacked state and the side portion in a press-contact state protect the corner of the object to be packaged by contacting the corner of the object to be packaged. . The inner flap is formed with a connection surface portion (16) protruding from the boundary with the first side wall toward the tip of the inner flap,
The buffer portion is formed by dividing the inner flap along a cutting line (20) extending from the tip of the inner flap to the connecting surface portion,
2. The packaging box according to claim 1, wherein the first plane portion is connected to the first side wall and the connecting surface portion. The side portion is
a first side surface portion (23A) that is continuous with one side forming a right angle of the second plane portion via the reverse folding line and overlaps the back surface of the first side wall;
2. A second side surface portion (23B) connected to the other side forming a right angle of the second plane portion via the reverse folding line and overlapping the back surface of the second side wall. Or the packaging box as described in 2. The peripheral wall, the inner flap and the outer flap are made of cardboard sheets,
4. The method according to any one of claims 1 to 3, characterized in that a stepped portion (27) formed by flattening the corrugated cardboard sheet in the thickness direction is formed in a region on the free end side opposite to the reverse folding line of the side portion. A packaging box according to any one of the above.

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