JP2021127131A - Packaging box - Google Patents

Abstract

To provide a packaging box capable of suppressing bottom falling-out.SOLUTION: A packaging box 1 includes: a peripheral wall 1W formed in a cylindrical shape by connecting a pair of first side walls 10 and a pair of second side walls 11 alternately; a bottom plate 23 connected to a lower end of one first side wall 10, formed to be longer than a distance between the pair of first side walls 10, and for closing a lower surface opening of the peripheral wall 1W in a posture inclined upward from one first side wall 10 toward the other first side wall 10; a bottom piece 24 connected to a tip of the bottom plate 23, and laminated on an inside surface of the other first side wall 10 by being folded downward; and a support piece 27 connected to a lower end of the other first side wall 10, for sandwiching the bottom piece 24 between itself and the other first side wall 10 by being folded upward, and for bringing a tip into contact with the bottom plate 23. At the bottom plate 23, an engagement recessed part 25A is formed, and at the support piece 27, an engagement protrusion part 25B to be engaged with the engagement recessed part 25A is formed.SELECTED DRAWING: Figure 6

Description

The present invention relates to a packaging box capable of suppressing bottoming out.

A box body having a bottom wall whose bottom does not easily come off even when a heavy product is put in has been proposed (Patent Document 1). The bottom wall has a notch parallel to the bottom, and a first lid that closes the opening and a first and second lid that inserts a protrusion into the notch when overlapping the first lid. A recess is provided at a position connecting the flap and the head and the inclined side, and when the flap is overlapped with the first lid, the head is inserted into the notch and the recess and the protrusions of the first and second flaps are occluded. It was equipped with two lids.

Japanese Unexamined Patent Publication No. 10-297628

In the above-mentioned box body, the bottom wall was formed by inserting the protruding portions of the first and second flaps and the head of the second lid body into the notch portion of the first lid body, but it is a heavy product. When the (article) was stored and carried, there was a risk that the protruding portion and the head would separate from the notch and the bottom wall would be disassembled (bottomed out). In other words, the above-mentioned bottom wall of the box body did not have sufficient measures against bottoming out.

The present invention provides a packaging box capable of suppressing bottoming out in order to solve the above problems.

In the packaging box of the present invention, a pair of first side walls and a pair of second side walls are alternately provided in series to form a tubular peripheral wall, and a pair of first side walls are connected to the lower end of any one of the peripheral walls. It is formed longer than the distance between the pair of the first side walls, and is inclined upward from one of the first side walls toward the other first side wall to close the lower surface opening of the peripheral wall. A bottom plate, a bottom piece connected to the tip of the bottom plate, bent downward and laminated on the inner surface of the other first side wall, and a pair of bottom pieces connected to the lower end of any one of the first side walls, and above. The bottom plate is provided with a support piece that is bent into the same shape and sandwiches the bottom piece with the other first side wall so that the tip of the bottom piece is brought into contact with the bottom plate. The bottom plate is formed with an engaging recess, and the support piece has an engaging recess. In the state where the support piece was bent upward, an engaging convex portion was formed to engage with the engaging concave portion.

In this case, a folded piece that is continuously provided at the tip of the support piece, folded back and laminated on the inner surface of the support piece is further provided, and the support piece is continuously provided on the other first side wall via a frame portion. The bottom piece and the folded piece may be sandwiched between the first side wall and the other side wall.

In this case, a pair of inner flaps that are continuously provided at the lower ends of the second side wall, bent inside the peripheral wall, and laminated on the upper surface of the bottom plate that closes the lower surface opening of the peripheral wall may be further provided. good.

In this case, the pair of the inner flaps are connected to the pair of the second side walls via the pair of connecting portions, and the boundary line between the connecting portions and the inner flaps closes the lower surface opening of the peripheral wall. The connecting portion is folded upward to face the inner surface of the second side wall, and the inner flap is bent along the boundary line to form an inclined posture. The bottom plate may be fitted between the pair of connecting portions to close the lower surface opening of the peripheral wall.

In this case, the engaging recess is continuously formed from the bottom plate to the bottom piece, and the portion of the bottom piece forming the engaging recess is formed thinner than the other portions, and the base end of the bottom plate is formed. A pair of auxiliary folding curves may be formed diagonally so as to approach each other from the side to the tip side.

According to the present invention, it is possible to prevent the bottom of the packaging box from falling out.

It is a perspective view which shows the packaging box which concerns on 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view explaining the procedure of forming the inner wall body of the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view explaining the procedure of forming the bottom wall body of the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view explaining the procedure of forming the support wall body of the packaging box which concerns on 1st Embodiment of this invention. FIG. 1 is a sectional view taken along line VI-VI of FIG. FIG. 6 is a cross-sectional view taken along the line VII-VII of FIG. It is a perspective view explaining the procedure of disassembling the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view which shows the packaging box which concerns on 2nd Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 2nd Embodiment of this invention. FIG. 9 is a cross-sectional view taken along the line XI-XI of FIG.

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. In addition, the terms indicating the direction and position are based on the direction and position in the state where the packaging box is assembled and used.

[First Embodiment]
The packaging box 1 according to the first embodiment 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 has a substantially rectangular parallelepiped appearance and is formed in a tray shape with an open upper surface. The packaging box 1 is configured to accommodate a heavy article M (see FIG. 6 and the like) such as fruits and vegetables, a container containing a beverage (can, bottle, PET bottle, etc.) or a metal product.

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The 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. 1) are attached to the front and back surfaces 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 shows the front liner 9B side. 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”.

[blank]
As shown in FIG. 2, the blank 5 includes a pair of first side walls 10, a pair of second side walls 11, a pair of inner wall bodies 12, a bottom wall body 13, and a support wall body 14. .. Although the details will be described later, the pair of inner wall bodies 12, the bottom wall body 13, and the support wall body 14 are combined to form the floor structure 20.

<1st side wall, 2nd side wall>
The pair of first side walls 10 and the pair of second side walls 11 are alternately connected from one side to the other in the flow direction via the first folding curve L1. The first side wall 10 and the second side wall 11 are formed in a substantially rectangular shape. Specifically, the first side wall 10 is formed in a substantially rectangular shape longer than the second side wall 11 in the flow direction. At the other end of the second side wall 11 in the flow direction, a joint piece 15 is continuously provided via the first folding curve L1.

<Inner wall>
The pair of inner wall bodies 12 are connected to one end of the pair of second side walls 11 in the step direction. Since the pair of inner wall bodies 12 are formed line-symmetrically with respect to the support wall body 14, one inner wall body 12 will be described below.

The inner wall body 12 has a connecting portion 21 and an inner flap 22.

(Connecting part)
The connecting portion 21 is continuously provided at one end (lower end) of the second side wall 11 in the step direction via the second folding curve L2. The connecting portion 21 is formed in a substantially triangular shape (or substantially trapezoidal shape) that gradually becomes thinner (from the rear to the front) as the distance from the support wall body 14 in the flow direction increases. The second folding curve L2 is formed substantially parallel to the flow direction, and the tip of the connecting portion 21 in the step direction is inclined with respect to the second folding curve L2. Specifically, the tip of the connecting portion 21 in the step direction (reverse polygonal line L11 described later) is inclined so as to approach the second side wall 11 (from the rear to the front) as the distance from the support wall body 14 increases. The dimension of the connecting portion 21 in the flow direction is set shorter than the dimension of the second side wall 11 in the flow direction, and the front leg portion 11A in contact with the installation surface G is formed in the front lower portion of the second side wall 11. ..

(Inner flap)
The inner flap 22 is continuously provided at the tip of the connecting portion 21 in the step direction via the reverse folding line L11. In other words, the inner flap 22 is continuously provided at one end (lower end) of the second side wall 11 in the step direction via the connecting portion 21. The inner flap 22 is formed in a substantially rectangular shape, and the tip of the inner flap 22 in the step direction is formed substantially parallel to the tip of the connecting portion 21 in the step direction (reverse polygonal line L11). That is, the tip of the inner flap 22 in the step direction is inclined with respect to the second folding curve L2. The corners of the inner flap 22 on the support wall 14 side are notched in a substantially rectangular shape.

<Bottom wall body>
The bottom wall body 13 has a bottom plate 23 and a bottom piece 24.

(Bottom plate)
The bottom plate 23 is continuously provided at one end (lower end) in the step direction of any one of the pair of first side walls 10 (front first side wall 10) via the second folding curve L2. The bottom plate 23 is formed in a substantially rectangular shape. The dimension (extended dimension) of the bottom plate 23 in the step direction is set longer than the dimension in the flow direction of the second side wall 11. Further, both ends in the flow direction of the root portion (the portion near the second folding curve L2) of the bottom plate 23 slightly protrude outward. A pair of auxiliary folding curves L12 are diagonally formed on the bottom plate 23 so as to approach each other from the base end side (the side of the second folding curve L2) in the step direction toward the tip end side. The pair of auxiliary folding curves L12 are formed in a substantially C shape in the region on the tip end side of the bottom plate 23 in the step direction.

(Bottom piece)
The bottom piece 24 is continuously provided at the tip of the bottom plate 23 in the step direction via the third folding curve L3. The bottom piece 24 is formed in a substantially rectangular shape with rounded corners at the tip corners in the step direction. The dimension (extended dimension) of the bottom piece 24 in the step direction is set to be substantially the same as the maximum dimension of the connecting portion 21 in the step direction.

(Engagement recess)
The bottom plate 23 is formed with an engaging recess 25A. To be precise, the engaging recess 25A is a hole formed continuously from the bottom plate 23 to the bottom piece 24 at the central portion of the bottom plate 23 in the flow direction. The engaging recess 25A has a rectangular opening in the bottom plate 23 and a fan-shaped (arch-shaped) opening in the bottom piece 24. The portion of the bottom piece 24 in which the engaging recess 25A is formed (one central portion 24A) is formed thinner than the other portions.

<Support wall>
The support wall body 14 has a frame portion 26, a support piece 27, and a folding piece 28.

(Picture frame)
The frame portion 26 is continuously provided at one end (lower end) in the step direction of any one of the pair of first side walls 10 (rear first side wall 10) via the second folding curve L2. The frame portion 26 is formed in a substantially rectangular shape (to be exact, a substantially trapezoidal shape that narrows toward the tip), and the dimension in the step direction (extension dimension) is set to be slightly longer than the thickness of the corrugated cardboard sheet. ing.

(Support piece)
The support piece 27 is continuously provided at the tip of the frame portion 26 in the step direction via the fourth folding curve L4. In other words, the support piece 27 is continuously provided at the lower end of the other first side wall 10 via the frame portion 26. The support piece 27 is formed in a substantially rectangular shape with the tip corner portion in the step direction cut diagonally. The dimension (extended dimension) of the support piece 27 in the step direction is set to be substantially the same as the extended dimension of the bottom piece 24.

(Folded piece)
The folding piece 28 is continuously provided at the tip of the supporting piece 27 in the step direction via the fifth folding curve L5. The folding piece 28 is formed in a substantially trapezoidal shape that widens toward the tip in the step direction. The dimension (extended dimension) of the folding piece 28 in the step direction is set to be slightly shorter than the extending dimension of the support piece 27.

(Engagement convex part)
An engaging convex portion 25B is formed at the tip of the support piece 27 in the step direction. The engaging convex portion 25B bites into the folding piece 28 from the tip of the support piece 27 in the step direction at the central portion in the flow direction of the support piece 27. The engaging convex portion 25B is partitioned by a cutting line formed on the folding piece 28, and is formed in a substantially rectangular shape in which the tip corner portion in the step direction is diagonally cut off. The engaging protrusion 25B is formed to have a width that allows it to be inserted into the engaging recess 25A.

The first to fifth folding curves L1 to L5 are general-purpose ruled lines in which the corrugated cardboard sheet is crushed from the back liner 9C side in the thickness direction. The general-purpose ruled line mainly has a function of bending (normally folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The reverse fold line L11 and the auxiliary fold curve L12 are reverse ruled lines obtained by crushing the corrugated cardboard sheet from the side of the front liner 9B in the thickness direction. The reverse ruled line mainly has a function of bending (reverse folding) the corrugated cardboard sheet so that the front liner 9B faces inward. These first folding curves L1 and the like are not limited to general-purpose ruled lines and reverse ruled lines, but are corrugated cardboard sheets such as sewing machine blade lines in which a plurality of cuts are formed at predetermined intervals, lead ruled lines in which sewing machine blade lines are formed on the general-purpose ruled lines, and the like. Any line can be used as long as it is a line for bending.

[Assembly of packaging box]
Next, the procedure for assembling the packaging box 1 will be described with reference to FIGS. 1, 3 to 7. FIG. 3 is a perspective view illustrating a procedure for forming the inner wall body 12. FIG. 4 is a perspective view illustrating a procedure for forming the bottom wall body 13. FIG. 5 is a perspective view illustrating a procedure for forming the support wall body 14. FIG. 6 is a sectional view taken along line VI-VI of FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. Note that FIGS. 3 to 5 show a state in which the packaging box 1 is turned upside down. Further, as an initial state before assembly, the first side wall 10 and the second side wall 11 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 side wall 10. It is assumed that the packaging box 1 is doubly folded so as to be adhered to the inner surface.

First, the operator bends the pair of the first side walls 10 and the pair of the second side walls 11 at substantially right angles along the first folding curve L1 (see FIG. 1). The pair of first side walls 10 face each other in the front-rear direction, and the pair of second side walls 11 face each other in the left-right direction. A pair of first side walls 10 and a pair of second side walls 11 are alternately provided in the circumferential direction to form a substantially square tubular peripheral wall 1W.

Subsequently, as shown in FIG. 3, the operator folds the pair of connecting portions 21 inside the peripheral wall 1W along the second folding curve L2, and reverse folds the pair of inner flaps 22 along the reverse folding line L11. .. Each connecting portion 21 is folded upward and faces the inner surface of the second side wall 11. The pair of inner flaps 22 are bent at the reverse folding line L11 so that their tips face each other. Further, as described above, since the reverse folding line L11 as the boundary line between the connecting portion 21 and the inner flap 22 is inclined, the pair of inner flaps 22 are bent at the reverse folding line L11 to move from the front to the rear. The posture is tilted upward.

Next, as shown in FIG. 4, the operator folds the bottom piece 24 in the reverse direction along the third folding curve L3, and bends the bottom plate 23 inward of the peripheral wall 1W along the second folding curve L2. As described above, since the bottom plate 23 is longer in the step direction (front-back direction) than the second side wall 11, the bottom plate 23 is lightly reverse-folded by a pair of auxiliary folding curves L12, and the tip of the bottom plate 23 (bottom piece 24). Moves upward while contacting the inner surface of the first side wall 10. In other words, since the bottom plate 23 is longer than the distance between the pair of first side walls 10, the bottom plate 23 is pushed into the peripheral wall 1W while expanding the pair of first side walls 10 in the front-rear direction. Further, the bottom plate 23 is pushed into the peripheral wall 1W while pressing the pair of connecting portions 21 toward the pair of second side walls 11.

When the bottom plate 23 is pushed in and the bottom plate 23 is tilted upward from the front to the rear (from one first side wall 10 to the other first side wall 10), a pair of first sides spread in the front-rear direction. The side wall 10 returns to its original position. The bottom plate 23 is fitted between the pair of connecting portions 21 and takes an inclined posture to close the lower surface opening of the peripheral wall 1W (see FIG. 7). In this state, the bottom piece 24 is bent downward and laminated on the inner surface of the front (other) first side wall 10 (see FIG. 6). Further, since the bottom piece 24 (the tip of the bottom plate 23) is lightly pressed against the inner surface of the first side wall 10, the bottom plate 23 is prevented from easily falling out from the inside of the peripheral wall 1W. Further, since the reverse folding line L11 is inclined in accordance with the bottom plate 23 that closes the lower surface opening of the peripheral wall 1W, the pair of inner flaps 22 are bent inward of the peripheral wall 1W to close the lower surface opening of the peripheral wall 1W. It is laminated on the upper surface of 23 (see FIGS. 6 and 7).

Next, as shown in the upper part of FIG. 5, the operator folds the folded piece 28 along the fifth folding curve L5, and the folded piece 28 is laminated on the inner surface of the support piece 27. Then, the engaging convex portion 25B is hollowed out from the folding piece 28 and protrudes from the tip of the supporting piece 27. After that, as shown in the lower part of FIG. 5, the operator folds the frame portion 26 forward along the second fold curve L2 and the support piece 27 forward folds along the fourth fold curve L4 (folds inward of the peripheral wall 1W). .. Further, the operator inserts (engages) the engaging convex portion 25B into the engaging concave portion 25A.

As a result, the assembly of the packaging box 1 is completed (see FIG. 1). Further, the pair of inner wall bodies 12, the bottom wall body 13 and the support wall body 14 are combined as described above to form the floor structure 20 (see the lower part of FIG. 5). In this state, as shown in FIG. 6, the tip (lower end) of the bottom piece 24 comes into contact with the frame portion 26. By bending the support piece 27 upward, the folding piece 28 is caught between the support piece 27 and the front first side wall 10. In other words, the support piece 27 sandwiches the bottom piece 24 and the folding piece 28 between the front first side wall 10 and the support piece 27. Further, the support piece 27 is bent upward to be in an upright posture, and its tip is brought into contact with the lower surface of the bottom plate 23. With the support piece 27 bent upward, the engaging convex portion 25B engages with the engaging concave portion 25A.

When the packaging box 1 is placed on the installation surface G, the lower end of the front first side wall 10 (boundary portion with the bottom plate 23), the front leg portions 11A of the pair of second side walls 11, and the frame portion 26 are mainly installed. It abuts on the surface G. Further, the worker places the article M on the floor structure 20 (inner flap 22 and bottom plate 23).

In the packaging box 1 according to the first embodiment described above, since the bottom plate 23 is longer than the distance between the pair of first side walls 10 (dimensions in the front-rear direction of the second side wall 11), the tip thereof is set to the first side wall. It is brought into contact with the inner surface of the peripheral wall 10 and pushed into the peripheral wall 1W while expanding the peripheral wall 1W in the front-rear direction. When the bottom plate 23 is in an inclined posture inside the peripheral wall 1W, it will not easily fall out of the peripheral wall 1W unless the peripheral wall 1W is expanded in the front-rear direction. Further, the support piece 27 is in an upright posture, presses the bottom piece 24 against the first side wall 10, and abuts on the lower surface of the bottom plate 23 in an inclined posture (see FIG. 6). According to this configuration, the load applied from the article M to the bottom plate 23 can be supported by the bottom piece 24 that abuts on the frame portion 26 and the support piece 27 that abuts on the rear portion of the bottom plate 23. As a result, even if the heavy article M is housed in the packaging box 1 and transported, it is possible to prevent the bottom plate 23 from coming off. Further, since the support piece 27 is held in the upright posture by engaging the engaging convex portion 25B with the engaging concave portion 25A, the function of supporting the load from the article M by the support piece 27 or the like can be maintained. ..

Further, in the packaging box 1 according to the first embodiment, the folding piece 28 is folded back inside the supporting piece 27, so that the supporting piece 27 and the folding piece 28 form a double wall (see FIG. 6). According to this configuration, the bottom plate 23 can be reliably received by the double wall formed by the support piece 27 and the folding piece 28. Further, the engaging convex portion 25B can be pressed against the edge portion of the engaging concave portion 25A by the repulsive force that the folding piece 28 tries to return to its original position. As a result, the engaging convex portion 25B is prevented from coming out of the engaging concave portion 25A, and the support piece 27 can be maintained in the upright posture.

Further, in the packaging box 1 according to the first embodiment, the connecting portion 21 is folded back inside the second side wall 11, and the inner flap 22 is bent so as to be substantially parallel to the bottom plate 23 (see FIG. 7). According to this configuration, a pair of inner flaps 22 are laminated on the bottom plate 23 to form a double wall, and the heavy article M can be received by the double wall formed by the bottom plate 23 and the inner flap 22. Further, the folded connecting portion 21 and the second side wall 11 form a double wall, and the bottom plate 23 is fitted between the pair of connecting portions 21, so that the double wall formed by the connecting portion 21 and the second side wall 11 is formed. Was retained (see FIG. 7). According to this configuration, the strength of the root portion of the inner flap 22 can be increased by the double wall formed by the connecting portion 21 and the second side wall 11. Further, since the second side wall 11 can be extended to the same position as the lowermost portion of the bottom plate 23, the gap between the bottom plate 23 and the installation surface G can be hidden (see FIGS. 1 and 7).

[Disassembly of packaging box]
Here, a case where the packaging box 1 (floor structure 20) is disassembled will be described with reference to FIG. FIG. 8 is a perspective view illustrating a procedure for disassembling the packaging box 1. Note that FIG. 8 shows a state in which the packaging box 1 is turned upside down.

To dismantle the floor structure 20, as shown in the upper part of FIG. 8, the operator pushes the rear part of the bottom plate 23 (near the support piece 27) toward the inside of the peripheral wall 1W (white in the upper part of FIG. 8). See the pull-out arrow). The bottom plate 23 is pushed into the peripheral wall 1W while being reverse-folded along the pair of auxiliary folding curves L12. As described above, the engaging recess 25A is opened in the center of the bottom piece 24, and the one central portion 24A is formed thinner than the other portions, and is easily bent. Therefore, as shown in the lower part of FIG. 8, the bottom piece 24 buckles at the central portion 24A of the piece as the bottom plate 23 is pushed in, the engaging recess 25A moves toward the inside of the peripheral wall 1W, and the engaging convex portion 25B. Comes out of the engaging recess 25A. Then, the packaging box 1 (floor structure 20) is disassembled by a procedure opposite to the procedure for assembling the packaging box 1 described above.

As described above, since the central portion 24A of the bottom piece 24 is formed thinly, the bottom piece 24 in the upright posture does not hinder the pushing of the bottom plate 23. According to this configuration, since the bottom plate 23 can be easily pushed in while being folded by the pair of auxiliary folding curves L12, the engaging convex portion 25B can be easily disengaged from the engaging concave portion 25A. Thereby, the packaging box 1 (bottom wall body 13) can be easily disassembled.

[Second Embodiment]
The packaging box 2 according to the second embodiment will be described with reference to FIGS. 9 to 11. FIG. 9 is a perspective view showing the packaging box 2. FIG. 10 is a plan view showing a blank 6 of the packaging box 2. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. In the following description, the same or corresponding configurations as those of the packaging box 1 according to the first embodiment are designated by the same reference numerals, and the same or corresponding description will be omitted.

As shown in FIG. 10, in the packaging box 2 (blank 6), the pair of connecting portions 21 is omitted, and a pair of inner flaps 32 are continuously provided at the lower ends of the pair of second side walls 11. In addition, one inner flap 32 will be described below.

The inner flap 32 is continuously provided at the lower end of the second side wall 11 via an inclined folding curve L21 (for example, a general-purpose ruled line). In the state of the blank 6, the inner flap 32 is inclined in the direction opposite to the inner flap 22 of the packaging box 1 according to the first embodiment, and is formed so as to bite into the second side wall 11. A rear leg portion 11B in contact with the installation surface G is formed on the rear lower portion of the second side wall 11, and the inclined folding curve L21 is formed obliquely between the front leg portion 11A and the rear leg portion 11B. Specifically, the inclined folding curve L21 is inclined upward from the front leg portion 11A to the rear leg portion 11B (from the front to the rear).

[Assembly of packaging box]
Next, the procedure for assembling the packaging box 2 will be briefly described.

First, the operator bends the pair of the first side wall 10 and the pair of the second side wall 11 at a substantially right angle along the first folding curve L1 to form a substantially square tubular peripheral wall 2W (see FIG. 9). Subsequently, the operator bends the pair of inner flaps 32 inward of the peripheral wall 2W along the inclined folding curve L21 (see FIG. 11). Since the inclined folding curve L21 is inclined, the pair of inner flaps 32 are bent at the inclined folding curve L21 so that the pair of inner flaps are inclined upward from the front to the rear.

After that, the worker assembles the packaging box 2 in the same procedure as the assembly procedure of the packaging box 1 according to the first embodiment. The pair of inner flaps 32 are laminated on the upper surface of the bottom plate 23, and together with the bottom wall body 13 and the support wall body 14, form the floor structure 30. When the packaging box 2 is placed on the installation surface G, the lower end of the front first side wall 10, the pair of front leg portions 11A, the pair of rear leg portions 11B, and the frame portion 26 mainly come into contact with the installation surface G ( (See FIG. 11).

According to the packaging box 2 according to the second embodiment described above, even if the heavy article M is accommodated and transported, bottoming out can be suppressed, and the same effect as that of the packaging box 1 according to the first embodiment can be obtained. Obtainable. Further, in the packaging box 2 according to the second embodiment, since the gap between the bottom plate 23 and the installation surface G is exposed (see FIGS. 9 and 11), the operator puts his / her hand in the gap and puts his / her hand in the gap to expose the bottom plate 23. You can carry it with your hand.

In the packaging boxes 1 and 2 according to the first and second embodiments, the length of the bottom plate 23 in the front-rear direction is such that the bottom plate 23 has a desired inclination angle according to the size, shape, type, etc. of the article M. It can be set freely. Further, it is preferable to set the heights of the bottom piece 24, the support piece 27, and the folding piece 28 according to the inclination angle of the bottom plate 23.

In the packaging boxes 1 and 2 according to the first and second embodiments, the folding piece 28 is continuously provided at the tip of the support piece 27, but the present invention is not limited to this. The fold piece 28 may be omitted (deleted) (not shown). In this case, the bottom piece 24 is sandwiched between the first side wall 10 and the support piece 27.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the support piece 27 is connected to the first side wall 10 via the frame portion 26, but the present invention is not limited to this. The frame portion 26 may be omitted (deleted), and the support piece 27 may be directly connected to the first side wall 10 (not shown). In this case, the tip of the bottom piece 24 comes into contact with the fold portion between the first side wall 10 and the support piece 27.

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, a pair of inner flaps 22, 32 (connecting portion 21) are provided, but the present invention is not limited to this, and the pair of inner flaps 22, 32 ( The connecting portion 21) may be omitted (not shown).

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the engaging recess 25A is formed from the bottom plate 23 to the bottom piece 24 across the third folding curve L3, but the present invention is limited to this. Not done. The engaging recess 25A may be open to the bottom plate 23 along at least the bottom piece 24. Further, when the engaging recess 25A is open only to the bottom plate 23, the portion of the bottom piece 24 in the vicinity of the engaging recess 25A may be made thinner than the other portions, or may be cut to reduce the strength. May be (not shown).

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the front leg portion 11A and the rear leg portion 11B are formed in the lower portion of the second side wall 11, but the front leg portion 11A and the rear leg portion 11B are formed. May be omitted (not shown).

The packaging boxes 1 and 2 according to the first and second embodiments are formed in a tray shape with an open upper surface, but the present invention is not limited to this. For example, flaps for closing the upper surface openings of the peripheral walls 1W and 2W may be connected to the upper ends of the first side wall 10 and the second side wall 11 (not shown). Further, although the packaging boxes 1 and 2 are formed in a substantially rectangular parallelepiped, for example, the packaging boxes 1 and 2 may be formed in a substantially octagonal columnar shape by chamfering the corners of the four sides of the rectangular parallelepiped (not shown).

Further, the packaging boxes 1 and 2 according to the first and second embodiments are 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 single-sided corrugated cardboard sheet in which a liner is attached to one side of the inner shin 9A, or a double-sided corrugated cardboard sheet in which a single-sided corrugated cardboard sheet and a double-sided corrugated cardboard sheet are laminated. Further, for example, the outer box 3 may be formed of a resin plate or the like instead of the paper corrugated cardboard sheet.

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 modified, replaced or modified without departing from the spirit of the technical idea, and the claims include all embodiments that may be included within the scope of the technical idea.

1, 2, Packaging box 1W, 2W Circumferential wall 10 1st side wall 11 2nd side wall 21 Connecting part 22, 32 Inner flap 23 Bottom plate 24 Bottom piece 25A Engaging recess 25B Engaging convex part 26 Frame part 27 Support piece 28 Folding piece L12 Auxiliary folding curve

Claims (5)

A pair of first side walls (10) and a pair of second side walls (11) are alternately provided in series to form a tubular peripheral wall (1W, 2W).
It is connected to the lower end of any one of the pair of the first side walls, is formed longer than the distance between the pair of the first side walls, and is upward from one of the first side walls toward the other first side wall. A bottom plate (23) that closes the lower surface opening of the peripheral wall in an inclined posture.
A bottom piece (24) that is connected to the tip of the bottom plate, bent downward, and laminated on the inner surface of the other first side wall.
A support piece (27) that is connected to the lower end of any one of the pair of the first side walls, is bent upward, sandwiches the bottom piece with the other first side wall, and brings the tip into contact with the bottom plate. And with
An engaging recess (25A) is formed in the bottom plate.
A packaging box characterized in that an engaging convex portion (25B) that engages with the engaging concave portion is formed on the supporting piece in a state where the supporting piece is bent upward. Further provided with a folded piece (28) which is connected to the tip of the support piece, folded back and laminated on the inner surface of the support piece.
The support piece is connected to the other first side wall via the frame portion (26), is bent upward, and sandwiches the bottom piece and the folded piece between the other first side wall. The packaging box according to claim 1. Further provided with a pair of inner flaps (22, 32) that are connected to the lower ends of the pair of the second side walls, bent inside the peripheral wall, and laminated on the upper surface of the bottom plate that closes the lower surface opening of the peripheral wall. The packaging box according to claim 1 or 2, wherein the packaging box is characterized in that. The pair of inner flaps are connected to the pair of the second side walls via the pair of connecting portions (21).
The boundary line between the connecting portion and the inner flap is inclined in accordance with the bottom plate that closes the lower surface opening of the peripheral wall.
The connecting portion is folded upward to face the inner surface of the second side wall, and the inner flap is bent along the boundary line to form an inclined posture.
The packaging box according to claim 3, wherein the bottom plate is fitted between the pair of connecting portions to close the lower surface opening of the peripheral wall. The engaging recess is continuously formed from the bottom plate to the bottom piece.
The portion of the bottom piece that forms the engaging recess is formed thinner than the other portions.
The invention according to any one of claims 1 to 4, wherein a pair of auxiliary folding curves (L12) are diagonally formed on the bottom plate so as to approach each other from the proximal end side toward the distal end side. Packaging box.

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