JP2021004067A - Packing box - Google Patents

Abstract

To provide a packing box that can have a cushioning structure easily formed.SOLUTION: A packing box 1 comprises a pair of lower inner flaps 13 connected to a pair of first side walls 10A, and a pair of lower outer flaps 14 connected to a pair of second side walls 10B, the lower inner flap 13 includes a cushioning part 17 (cushioning structure 18) which protects a corner part 91 of a packed object 90, and the cushioning part 17 includes a first plane part 21 in a right-angled triangular shape, a second plane part 22 connected to a hypotenuse common to the first plane part 21 through a positive fold line 25 and in a right-angled triangular shape, and a side face part 23 connected to the second plane part 22 through a reverse fold line 26. In a process of layering the second plane part 22 on the first plane part 21, the side face part 23 is folded along the reverse fold line 26 in slide contact with a reverse face of a side wall 10 to be pressed against the reverse face of the side wall 10, thereby holding the second plane part 22 in a layered state.SELECTED DRAWING: Figure 6

Description

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

Patent Document 1 discloses an assembly box provided with a buffer for holding an object to be packed. The shock absorber was formed in the inner corner of the assembly box when the inner flap was divided into two and each divided inner flap was folded. The cushioning portion was formed in a hollow triangular columnar shape, and a recess for fitting the corner portion of the object to be packed was recessed on the upper surface of the cushioning portion.

Japanese Unexamined Patent Publication No. 2000-326959

However, in the above-mentioned assembly box, in order to form the triangular columnar cushioning portion, it is necessary to bend a large number of the divided inner flaps in a predetermined order. Therefore, in the above-mentioned assembly box, the shock absorber cannot be easily assembled.

In order to solve the above problems, the present invention provides a packaging box in which a buffer structure can be easily formed.

In order to achieve the above object, the packaging box according to the present invention has a peripheral wall formed in a tubular shape by alternately connecting a pair of first side walls and a pair of second side walls, and a pair of ends of the first side wall. A pair of inner flaps that are connected to the portion and can be bent inward, and a pair of inner flaps that are connected to the end of the second side wall, are bent inward and overlap the inner flaps, and the opening surface of the peripheral wall. The inner flap comprises a pair of outer flaps that partially or completely occlude, said inner flap having at least one buffer that forms a buffer structure to protect the corners of the object to be packaged. A regular fold line is formed on the first plane portion formed in a right-angled triangle in which the boundary with the first side wall and one side of the inner flap along the second side wall form a right angle, and the diagonal side common to the first plane portion. At least one of the second plane portion forming a right-angled triangle line-symmetrical with the first plane portion and the two sides forming a right angle with the second plane portion, which are continuously provided via the normal folding line. In a process in which the second flat surface portion is folded back along the normal folding line and laminated on the first flat surface portion, the side surface portion includes the side surface portion continuously provided with the reverse folding line. It bends along the reverse folding line while sliding on the back surface of at least one of the first side wall and the second side wall, and is in a pressure contact state in which the first side wall and the back surface of at least one of the second side walls are overlapped with pressure. As a result, the second flat surface portion is held in a laminated state in which the first flat surface portion is laminated, and the second flat surface portion in the laminated state and the side surface portion in the pressure contact state are the objects to be packaged. The corners of the object to be packaged are protected by contacting the corners.

In this case, the inner flap is formed with a connecting surface portion that protrudes 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 connecting surface portion. It is preferably formed by dividing the inner flap along the cutting line, and the first plane portion is connected to the first side wall portion and the connection 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 portion with the first side surface portion and the second flat surface portion. It is preferable to include a second side surface portion which is connected to the other side forming a right angle of the above via the reverse polygonal line 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 a corrugated cardboard sheet, and the corrugated cardboard sheet is crushed in the thickness direction in a region on the free end side opposite to the reverse folding line of the side surface portion. 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 which shows the packaging box which concerns on one Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on one Embodiment of this invention. It is an enlarged plan view which shows a part of the blank of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the cushioning part of the packaging box which concerns on one Embodiment of this invention. It is a perspective view explaining the process of forming the cushioning structure of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the cushioning structure of the packaging box which concerns on one Embodiment of this invention. It is a perspective view explaining the process of accommodating an object to be packaged in the packaging box which concerns on one Embodiment of this invention. It is sectional drawing explaining the relationship between the cushioning structure of the packaging box which concerns on one Embodiment of this invention, and the corner part of the packaged object.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the drawing, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates "U". "Upper" and "D" indicate "lower". The front-back direction is orthogonal to the left-right direction, and the up-down direction is orthogonal to the front-back direction and the left-right direction. Although terms indicating directions and positions are used in the present specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[Outline 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. 2 is a plan view showing a blank 5 of the packaging box 1.

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 the substantially square tubular peripheral wall 1W. A substantially rectangular parallelepiped object to be packaged 90 is housed inside the packaging box 1 (see FIG. 7).

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The packaging box 1 (blank 5) is formed of, for example, a double-sided corrugated cardboard sheet made of paper in which a front liner 9B and a back liner 9C (see FIG. 4) are attached to the front and back of a wavy inner shin 9A. The blank 5 is formed by punching, for example, a single corrugated cardboard sheet with a die. Note that FIG. 2 (and FIG. 3) show the front liner 9B side (outer surface side of the packaging box 1). In the present specification, the direction parallel to the corrugated cardboard inner shin 9A is referred to as the "step direction", and the direction orthogonal to the step direction (middle shin 9A) is referred to as the "flow direction". “X” shown in the drawing indicates “step direction”, and “Y” indicates “flow direction”. Further, in the present specification, the terms indicating the direction and the position refer to the direction and the position 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 side walls 10A, a pair of second side walls 10B, a pair of upper inner flaps 11, a pair of upper outer flaps 12, and a pair of lower inner flaps 13 ( An inner flap) and a pair of lower outer flaps 14 (outer flaps) are included.

<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 curve 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 that is longer in the flow direction than the first side wall 10A. At the other end of the second side wall 10B in the flow direction, a joint piece 15 is continuously provided 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) of the pair of first side walls 10A in the step direction via the second folding curve L2. The upper inner flap 11 is formed in a substantially rectangular shape, and its dimension in the step direction (extended dimension) is set to be substantially 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) of the pair of second side walls 10B in the step direction via the second folding curve L2. The upper outer flap 12 is formed in a substantially rectangular shape, and the dimension (extended dimension) in the step direction thereof is substantially the same as the extended dimension of the upper inner flap 11.

<Lower inner flap, lower outer flap>
The pair of lower inner flaps 13 are continuously provided at the other end (lower end) of the pair of first side walls 10A in the step direction via the third folding curve L3. As will be described in detail later, each lower inner flap 13 has two cushioning portions 17 forming a buffering structure 18 for protecting the corner portions 91 of the packaged object 90. The general shape of 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 provided in the central portion of the lower inner flap 13 in the flow direction from the tip end (free end) toward the base end. The pair of lower outer flaps 14 are continuously provided at the other end (lower end) of the pair of second side walls 10B in the step direction via the third folding curve L3. The lower outer flap 14 is formed in substantially the same shape as the upper outer flap 12.

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

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

The lower inner flap 13 is formed with a connecting surface portion 16 and a pair of cushioning portions 17.

<Connection surface>
The connecting surface portion 16 is formed so as to protrude from the third folding curve L3 (boundary with the first side wall 10A) toward the tip of the lower inner flap 13. The connecting 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.

<Cushioning unit>
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 apex) 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 alternately arranged side by side. Since the pair of buffer portions 17 have a shape that is axisymmetric with the cutting line 20 as the axis of symmetry, one buffer portion 17 will be described below.

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

(1st plane part)
The first flat surface portion 21 is formed on the base end side of the lower inner flap 13 and outside in the flow direction. The first flat surface portion 21 is formed into a substantially right triangle in which the third folding curve L3 and the outer edge of the lower inner flap 13 in the flow direction (one side of the lower inner flap 13 along the second side wall 10B in the assembled state) form a right angle. Has been done. The base end of the first flat surface portion 21 in the step direction is connected to the first side wall 10A via the third folding curve L3, and the inner end of the first flat surface portion 21 in the flow direction is connected to the connecting surface portion 16. ..

(Second plane part)
The second flat surface portion 22 is continuously provided on a common oblique side with the first flat surface portion 21 via a normal folding line 25. Further, the second plane portion 22 is formed in a right triangle having line symmetry with the first plane portion 21 about the normal folding line 25 as an axis. The base end of the second flat surface portion 22 in the step direction is adjacent to the connecting surface portion 16 via the curved cut 20A.

The normal folding line 25 is formed diagonally between the outer edge of the lower inner flap 13 in the flow direction and the connecting surface portion 16. The normal folding line 25 is a line in which a plurality of (for example, three) cut lines 25A and a plurality of (for example, two) frame portions 25B are alternately arranged side by side. The cut line 25A is a line formed by penetrating the cutting tool in the thickness direction of the corrugated cardboard sheet. The frame portion 25B is a pair of end lines 25C formed at the end of the cut line 25A in a direction orthogonal to the cut line 25A, and a pair of folded ends formed so as to connect the ends of the pair of end lines 25C. It has a line 25D and. The end line 25C is a line formed by penetrating the blade in the thickness direction of the corrugated cardboard sheet. The folding line 25D is a general-purpose ruled line formed in parallel with the cut line 25A.

(1st side surface part)
The first side surface portion 23A is continuously provided at the end portion of the second flat surface portion 22 in the flow direction (one side forming a right angle of the second flat surface portion 22) via the reverse polygonal line 26. The first side surface portion 23A is formed between the reverse folding line 26 and the cutting line 20 in a right triangle having the cutting line 20 as the hypotenuse. The base end of the first side surface portion 23A in the step direction is adjacent to the connecting surface portion 16 via the curved cut 20A. Further, in the region on the cutting line 20 side of the first side surface portion 23A (the region on the free end side opposite to the reverse folding line 26), a step crushing portion 27 obtained by crushing the corrugated cardboard sheet in the thickness direction is formed ( See the shaded area in FIG. 3).

(Second side surface)
The second side surface portion 23B is continuously provided at the tip end portion (the other side forming a right angle of the second plane portion 22) of the second plane portion 22 in the step direction via the reverse polygonal line 26. The second side surface portion 23B is formed in a right triangle (to be exact, a quadrangle) having the reverse polygonal line 26 as the hypotenuse. The free end of the second side surface portion 23B on the opposite side of the reverse folding line 26 is aligned with the tip of the lower outer flap 14. Further, a step-crushed portion 27 is formed in a region on the free end side opposite to the reverse polygonal line 26 of the second side surface portion 23B (see the shaded portion in FIG. 3).

The reverse folding line 26 is composed of a reverse ruled line obtained by crushing a corrugated cardboard sheet linearly in the thickness direction from the front liner 9B side, and a sewing machine blade cut on the reverse ruled line. The reverse folding line 26 has a function of bending (reverse folding) the corrugated cardboard sheet so that the front liner 9B faces inward. The reverse folding line 26 is not limited to the above configuration, and may be only a reverse ruled line or only a sewing machine blade, or any other line as long as it is a line for bending a corrugated cardboard sheet.

In addition, in this specification, "the first plane part 21, the second plane part 22, the first side surface part 23A and the second side surface part 23B are formed into a right triangle" is a right triangle in a strict sense. It does not require that there be, but means that approximately one internal angle is formed into a triangle forming a right angle. Further, "the first plane portion 21 and the second plane portion 22 are line-symmetrical" does not require that the first plane portion 21 and the second plane portion 22 are line-symmetrical in a strict sense, but means that some errors are allowed.

[Assembly of packaging box]
Next, the assembly procedure (sealing procedure) of the packaging box 1 will be described with reference to FIGS. 1, 4 to 8. FIG. 4 is a perspective view showing the buffer portion 17. FIG. 5 is a perspective view illustrating a process of forming the buffer structure 18. FIG. 6 is a perspective view showing the buffer structure 18. FIG. 7 is a perspective view illustrating a process of accommodating the object to be packaged 90 in the packaging box 1. FIG. 8 is a cross-sectional view illustrating the relationship between the buffer structure 18 and the corners 91 of the packaged object 90. The packaging box 1 may be manually assembled by an operator, or may be automatically or semi-automatically assembled by a box making machine. Here, as an example, a case where an operator assembles the packaging box 1 will be described. As an initial state before assembling the packaging box 1, the first side wall 10A and the second side wall 10B located on both outer sides in the flow direction of the blank 5 are bent along the first folding curve L1, and the joint piece 15 is the first. It is assumed that the packaging box 1 is doubly folded so as to be adhered to the inner surface of the side wall 10A.

First, the operator bends the pair of the first side wall 10A and the pair of the second side wall 10B at a substantially right angle along the first folding curve L1 to form a substantially square tubular peripheral wall 1W with both upper and lower end surfaces open. (See FIG. 7).

Subsequently, the operator bends the pair of lower inner flaps 13 inward of the peripheral wall 1W along the third folding curve L3, and then bends the pair of lower outer flaps 14 inside the peripheral wall 1W along the third folding curve L3. Fold it in. In this state, the tips of the pair of lower inner flaps 13 are separated, and the tips of the pair of lower outer flaps 14 are butted against each other (see FIG. 4). The pair of lower outer flaps 14 overlaps with 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). The operator attaches an adhesive tape (not shown) along the abutting portion of the pair of lower outer flaps 14. As a result, the bottom surface of the packaging box 1 is formed.

Next, the operator forms four buffer 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 description common to the first side wall 10A and the second side wall 10B, it is simply referred to as "side wall 10", and only arithmetic numbers are used as the reference numerals. Similarly, in the description common to the first side surface portion 23A and the second side surface portion 23B, it is simply referred to as "side surface portion 23", and only arithmetic numbers are used as 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 grips the second flat surface portion 22 of the cushioning portion 17 and folds the second flat surface portion 22 along the normal folding line 25 so as to overlap the first flat surface portion 21. The second flat surface portion 22 is separated from the first flat surface portion 21 at the cut line 25A, and is folded at a substantially right angle at each folding line 25D so that the second flat surface portion 22 is folded back at approximately 180 degrees.

Here, as shown in FIG. 5, when the second flat surface portion 22 starts to be folded back, the outer end of the second side surface portion 23B in the flow direction starts to slide on the back surface (back liner 9C) of the second side wall portion 10B, and the outer end thereof starts to slide. Due to the frictional force, the second side surface portion 23B begins to reversely bend along the reverse folding line 26. As the folding of the second flat surface portion 22 progresses, the central side of the first side surface portion 23A begins to contact the back surface (back liner 9C) of the first side wall portion 10A, and as the folding of the second flat surface portion 22 further 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 start reverse bending along the reverse folding line 26. In this way, along with the folding back of the second flat surface portion 22, the side surface portion 23 moves while contacting the side wall 10 and is naturally (automatically) reverse-folded along the reverse folding line 26.

As shown in FIG. 6, when the second flat surface portion 22 is folded back until it overlaps the first flat surface portion 21, the first side surface 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. (Pressure contact), the second side surface portion 23B is folded at a substantially right angle at the reverse folding line 26 and overlaps (pressure contact) with pressure on the back surface of the second side surface 10B. In this way, the side surface portion 23 is in a pressure contact state in which the side surface portion 23 is superposed on the back surface of the side wall 10 with pressure, so that the second flat surface portion 22 is prevented from returning to its original state by the restoring force acting on the crease. That is, the side surface portion 23 has a function of holding the second flat surface portion 22 in a laminated state in which the second flat surface portion 22 is laminated on the first flat surface portion 21 by being in a pressure contact state. As described above, the buffer structure 18 for protecting the corners 91 of the object to be packaged 90 is completed. The operator bends the other cushioning portions 17 in the same procedure as described above to form the four cushioning structures 18 at the four corners of the bottom surface of the packaging box 1 (peripheral wall 1W).

In the buffer structure 18, the second flat surface portion 22 overlaps the first flat surface portion 21 to form a double bottom structure. To be precise, since the first flat surface portion 21 overlaps the lower outer flap 14, the bottom portion of the buffer structure 18 constitutes a triple bottom structure (see FIGS. 6 and 8). Further, in the buffer structure 18, the first side surface portion 23A overlaps the first side wall 10A to form a double bottom structure, and the second side surface portion 23B overlaps the second side wall 10B to form a double bottom structure. (See FIGS. 6 and 8).

Next, as shown in FIG. 7, the operator puts the object to be packaged 90 into the packaging box 1 (peripheral wall 1W) from above, and puts the four corners 91 at the bottom of the object to be packaged 90 into four cushioning structures. Place at 18. Specifically, as shown in FIG. 8, each corner portion 91 of the object to be packaged 90 is arranged on the second plane portion 22 in a laminated state. Further, the first side surface portion 23A and the second side surface portion 23B in the pressure-welded state come into contact with the side surface of the corner portion 91 of the packaged object 90. In this way, the second flat surface portion 22 in the laminated state and the side surface portion 23 in the pressure contact state come into contact with the corner portions 91 (three surfaces constituting the packaged object 90) to form the packaged object 90. Protect the corner 91.

Next, the operator covers the four corners 91 of the upper part of the object to be packaged 90 with a cushioning material (not shown), and puts a pair of upper inner flaps 11 inside the peripheral wall 1W along the second folding curve L2. After bending, the pair of upper and outer flaps 12 are bent inward of the peripheral wall 1W along the second folding curve L2 (see FIG. 1). Finally, the operator attaches the adhesive tape along the abutment of the pair of upper and outer flaps 12.

As a result, 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 surface portion 21 so as not to hinder 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 surface portion 22 is folded back along the normal folding line 25 and laminated on the first flat surface portion 21, the side surface portion 23 is placed on the back surface of the side wall 10. It is configured to bend along the reverse folding line 26 while sliding. Further, the side surface portion 23 is in a pressure contact state in which the side surface portion 23 is superposed on the back surface of the side wall 10 with pressure, so that the second flat surface portion 22 is maintained in a laminated state in which the first flat surface portion 21 is laminated. Then, the second flat surface portion 22 overlaps the first flat surface portion 21 to form a double bottom structure, and the side surface portion 23 overlaps the side wall 10 to form a double wall structure, whereby the four corners of the bottom surface of the packaging box 1 are formed. A buffer structure 18 was formed in the building. According to this configuration, the side surface portion 23 is automatically brought into a pressure contact state only by folding back the second flat surface portion 22, and the cushioning structure 18 can be formed in the packaging box 1. Further, since the side surface portion 23 is in the pressure contact state, the second flat surface portion 22 is held in the laminated state, so that it is possible to prevent the buffer structure 18 from being disassembled by the restoring force acting on the fold. As described above, the cushioning structure 18 for protecting the corners 91 of the object to be packaged 90 can be easily formed.

Further, in the packaging box 1 according to the present embodiment, a connecting surface portion 16 is provided at the base end of the lower inner flap 13, and a pair of first flat surface portions 21 are continuously provided. If the connecting surface portion 16 is omitted (deleted) and the cutting line 20 extends from the tip end to the base end of the lower inner flap 13, the lower inner flap 13 is completely divided into two parts. In this case, at the time of assembling the packaging box 1, the operator has to bend the lower inner flap 13 divided into two separately, which causes a problem that the assembly work cannot be performed quickly. On the other hand, according to the packaging box 1 according to the present embodiment, since the cutting line 20 is not formed on the connecting surface portion 16 located at the base end of the lower inner flap 13, the lower inner flap 13 is from the tip end to the base end. It is possible to prevent the product from being completely divided into two parts. As a result, when assembling the packaging box 1, the operator can bend the entire base of the undivided lower inner flap 13 at a time, and the procedure is the same as that of a general lower inner flap without a cutting line 20. The assembly work can be performed quickly. It is preferable that the connection surface portion 16 is provided as described above, but the present invention does not prevent the connection surface portion 16 from being omitted (deleted).

Further, in the packaging box 1 according to the present embodiment, the second flat surface portion 22 comes into contact with the bottom surface of the corner portion 91 of the packaged object 90, and the first side surface portion 23A and the second side surface portion 23B are the packaged object 90. The corner 91 is configured to come into contact with two adjacent surfaces. According to this configuration, it is possible to protect the three surfaces constituting the corner portion 91 of the object to be packaged 90.

Further, according to the packaging box 1 according to the present embodiment, since the step-crushed portion 27 is formed thinner than the other portions, when the object to be packaged 90 is housed inside the packaging box 1, it is covered. It is possible to prevent the package 90 from interfering with the tip (free end) of the side surface portion 23. As a result, the object to be packaged 90 can be smoothly housed inside the packaging box 1. The step crushing portion 27 may crush the inner shin 9A from either the front or back side of the corrugated cardboard sheet, but considering the ease of inserting the packaged object 90 into the buffer structure 18, the front side (front liner 9A side). ) To crush the corrugated cardboard 9A.

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 done. Either one of the first side surface portion 23A and the second side surface portion 23B may be omitted (deleted) (not shown). That is, the side surface portion 23 may be continuously provided on at least one of the two sides forming a right angle of the second flat surface portion 22 via the reverse polygonal line 26. In this case, the side surface portion 23 holds the second flat surface portion 22 in a laminated state by being in a pressure contact state in which the first side wall portion 10A and the second side wall portion 10B are overlapped with pressure on the back surface of at least one of them. Further, the first side surface portion 23A and the second side surface portion 23B are formed in a right triangle, but are not limited to this, and are formed in other shapes such as a triangle, a quadrangle, and a semicircle other than a right triangle. May (not shown).

Further, in the packaging box 1 according to the present embodiment, four cushioning portions 17 (buffering structure 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 cushioning portions 17 (buffering structure 18) may be increased or decreased depending on the shape of the packaged object 90. For example, only one of the lower inner flaps 13 divided into two by the cutting line 20 may be used as the buffer portion 17 (not shown).

Further, in the packaging box 1 according to the present embodiment, the pair of upper inner flaps 11 and the pair of lower inner flaps 13 are separated from each other at their tips, but the present invention is not limited to this, and the tips thereof are thrust into each other. May be combined (not shown). Further, the pair of upper outer flaps 12 and the pair of lower outer flaps 14 block the entire opening surface of the peripheral wall 1W, but the present invention is not limited to this, and the pair of upper outer flaps 12 and the pair of lower outer flaps 14 may be formed so as to block a part of the opening surface. Good (not shown). That is, the pair of lower outer flaps 14 and the like may be formed so as to separate their tip portions (not shown).

Further, in the packaging box 1 according to the present embodiment, the cushioning portion 17 (buffer structure 18) is provided on the lower inner flap 13, but the present invention is not limited to this. The buffer 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 on the upper inner flap 11, the packaging box 1 is assembled (sealed) with the top and bottom (upper and lower) reversed. Alternatively, the buffer portion 17 may be provided on both the upper inner flap 11 and the lower inner flap 13 (not shown). As an assembly procedure of 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 forming the cushioning structure 18 of the lower inner flap 13 and accommodating the packaged object 90, the upper part The buffer structure 18 of the upper inner flap 11 is formed before the inner flap 11 is bent along the second folding curve L2. Then, the side surface portion 23 is inserted into the gap between the side wall 10 and the packaged object 90 to bring the buffer structure 18 into contact with the upper corner portion 91 of the packaged object 90.

Further, the packaging box 1 according to the present embodiment is a so-called type A corrugated cardboard box, but the present invention is not limited thereto. For example, the packaging box 1 may be configured in a tray shape in which the upper inner flap 11 and the upper outer flap 12 are omitted (deleted) and the upper end surface of the peripheral wall 1W is opened (not shown).

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

The description of the above-described embodiment shows one aspect of the packaging box and the folding method of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above-described embodiment.

1 Packaging box 1W Peripheral wall 10 Side wall 10A 1st side wall 10B 2nd side wall 13 Lower inner flap (inner flap)
14 Lower outer flap (outer flap)
16 Connection surface part 17 Cushioning part 18 Cushioning structure 20 Cutting line 21 1st flat part 22 2nd flat part 23 Side part 23A 1st side surface part 23B 2nd side surface part 25 Normal folding line 26 Reverse folding line 27 Step crushing part 90 Packaged material 91 Corner L3 3rd folding curve (boundary)

Claims (4)

A peripheral wall (1W) formed in a tubular 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) that are connected to the ends of the first side wall and can be bent inward.
A pair of outer flaps (14), which are connected to the ends of the second side wall, are bent inward, overlap the inner flaps, and close a part or all of the opening surface of the peripheral wall.
The inner flap has at least one buffer (17) that forms a buffer structure (18) to protect the corners (91) of the object to be packaged (90).
The shock absorber
A first plane portion (21) formed in a right 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) that is connected to the hypotenuse common to the first plane portion via a normal fold line (25) and forms a right triangle that is line-symmetric with the first plane portion with the normal fold line as an axis. ,
Includes a side surface portion (23) connected to at least one of the two sides forming a right angle of the second plane portion via a reverse polygonal line (26).
In the process in which the second flat surface portion is folded back along the normal folding line and laminated on the first flat surface portion, the side surface portion is in sliding contact with the back surface of at least one of the first side wall and the second side wall. However, the second plane portion is laminated on the first plane portion by bending along the reverse folding line and forming a pressure contact state in which the first side wall and the second side wall are overlapped with pressure on the back surface of at least one of the first side wall and the second side wall. Hold in a laminated state
A packaging box characterized in that the second flat surface portion in a laminated state and the side surface portion in a pressure-welded state protect the corner portions of the packaged object by contacting the corner portions of the packaged object. .. The inner flap is formed with a connecting surface portion (16) protruding from the boundary with the first side wall toward the tip of the inner flap.
The cushioning 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.
The packaging box according to claim 1, wherein the first flat surface portion is connected to the first side wall portion and the connecting surface portion. The side surface portion
A first side surface portion (23A) which is continuously provided on one side forming a right angle of the second plane portion via the reverse polygonal line and overlaps the back surface of the first side wall portion.
Claim 1 is characterized by including a second side surface portion (23B) which is connected to the other side forming a right angle of the second flat surface portion via the reverse polygonal line and overlaps the back surface of the second side wall portion. Or the packaging box according to 2. The peripheral wall, the inner flap and the outer flap are made of a corrugated cardboard sheet.
Claims 1 to 3, wherein a step-crushed portion (27) obtained by crushing the corrugated cardboard sheet in the thickness direction is formed in a region on the free end side of the side surface portion opposite to the reverse folding line. The packaging box described in either.

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