JP2021138389A - Packaging box - Google Patents

Abstract

To provide a packaging box capable of holding a flap in an upright posture by suppressing the separation of an insertion piece.SOLUTION: A packaging box 1 includes: a peripheral wall W formed in a cylindrical shape by connecting an end wall 10A and a side wall 10B in a peripheral direction; a plurality of upper flaps 12 continued to upper ends of the end wall 10A and the side wall 10B, for closing an upper surface opening part W1 of the peripheral wall W; and a holding part 15 formed at least at a pair of upper flaps 12 adjacent to each other in the peripheral direction out of the plurality of upper flaps 12, for holding the pair of upper flaps 12 for opening the upper surface opening part W1 in an upright posture. The holding part 15 includes: an insertion hole 20 formed at a pair of upper outside flaps 12B; and an insertion piece 25 extending vertically in a pair of upright upper inside flaps 12A, and inserted in the insertion hole 20 from the outside facing the upper outside flap 12B by being folded diagonally.SELECTED DRAWING: Figure 6

Description

The present invention relates to a packaging box capable of holding the flap in an upright position.

A packaging box with flaps provided with a plurality of flaps that can be opened and closed provided on one open end edge of a tubular body is known (Patent Document 1). One flap (first flap) is provided with a bent piece cut in a horizontal strip shape, and the adjacent flap (second flap) is provided with an insertion hole at a distance from the tip edge. rice field. A pair of adjacent flaps were held in an upright position by bending the folded piece at a crease line extending in the vertical direction and inserting it into the insertion hole.

Utility Model Registration No. 3215759

However, in the above-mentioned packaging box with flaps, the folded pieces are bent horizontally toward the second flap, so that if excessive tension is applied to the folded pieces during bending, the folded pieces can reach the edge of the first flap. There was a risk that the cutting would proceed and the folding curve would be torn (separated) from the first flap. In the above-mentioned packaging box with a flap, there is a problem that the function of holding the flap in an upright state is impaired due to the tearing of the folding curve.

In order to solve the above problems, the present invention provides a packaging box capable of suppressing the separation of the insertion piece and enabling the function of holding the flap in the upright posture.

In order to achieve the above object, the packaging box of the present invention is provided with a peripheral wall formed by connecting a plurality of wall bodies in the circumferential direction in a cylindrical shape and a peripheral wall formed at the upper end of the plurality of wall bodies. A holding portion that is formed on a plurality of flaps that close the upper surface opening and a pair of the flaps that are adjacent to each other at least in the circumferential direction among the plurality of flaps and that holds the pair of flaps that open the upper surface opening in an upright posture. The holding portion is extended in the vertical direction in the insertion hole formed in the flap of any one of the pair of flaps and the flap of any one of the pair of standing flaps. It has an insertion piece that is bent diagonally so that it is directed toward one of the flaps and is inserted into the insertion hole from the inside or the outside.

In this case, the insertion piece is partitioned by a cutting line extending from the tip of the other flap toward the root side, and the insertion piece is the root of the cutting line with the other flap standing upright. It may be bent along an inclined fold line that slopes upward from the side end toward one of the flaps.

In this case, an engaging portion formed on the tip end side of the insertion piece with a width equal to or larger than the root side of the insertion piece and press-fitted into the insertion hole may be formed.

In this case, the insertion piece may be formed with a cut line that meshes with the edge of the insertion hole while being inserted into the insertion hole.

In this case, an insertion auxiliary folding line may be formed on the tip end side of the insertion piece to bend the tip end side of the insertion piece in the process of being inserted into the insertion hole.

In this case, the insertion hole may be opened by pushing in a block piece defined by a cut line formed in one of the flaps.

According to the present invention, there is provided a packaging box capable of suppressing the separation of insert pieces and holding the flap in an upright posture.

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 top view which shows the part of the blank of the packaging box which concerns on 1st Embodiment of this invention in an enlarged manner. FIG. 5 is a perspective view showing a state in which the insertion piece is folded back in the packaging box according to the first embodiment of the present invention. FIG. 5 is a perspective view showing a state in which the tip end portion of the insertion piece is aligned with the insertion hole in the packaging box according to the first embodiment of the present invention. FIG. 5 is a perspective view showing a state in which the tip end portion of the insertion piece is inserted into the insertion hole in the packaging box according to the first embodiment of the present invention. It is a packaging box which concerns on 1st Embodiment of this invention, and is the perspective view which shows the tip part of the insertion piece inserted into the insertion hole from the inside. It is a part of the packaging box according to the first embodiment of the present invention, and is a perspective view showing a state in which the tip end portion of the insertion piece is inserted into the insertion hole and the closing piece is closed. It is a top view which shows the blank of the packaging box which concerns on 2nd Embodiment of this invention. It is a part of the packaging box which concerns on 2nd Embodiment of this invention, and is the perspective view which shows the state which the tip part of the insertion piece was inserted into the insertion hole. It is a top view which shows the blank of the packaging box which concerns on 3rd Embodiment of this invention. It is a part of the packaging box which concerns on 3rd Embodiment of this invention, and is the perspective view which shows the state which the tip part of the insertion piece was inserted into the insertion hole. It is a top view which shows the blank of the packaging box which concerns on the modification of 1st Embodiment of this invention.

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, the left-right direction, and the up-down direction are orthogonal to each other. 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 is a type A box that is sealed by closing the upper and lower end surfaces of the peripheral wall W. The peripheral wall W is formed in a square cylinder shape by alternately arranging a pair of end walls 10A and a pair of side walls 10B as an example of a plurality of wall bodies in the circumferential direction. The lower surface opening (not shown) of the peripheral wall W is closed by a pair of lower inner flaps 11A and a pair of lower outer flaps 11B, and the upper surface opening W1 of the peripheral wall W is closed by a pair of upper inner flaps 12A and a pair of upper outer flaps 12B. Closed by.

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed by punching a single paper corrugated cardboard sheet with a die or the like. The corrugated cardboard sheet is, for example, a double-sided corrugated cardboard sheet in which a front liner 9B and a back liner 9C (see FIG. 4) are bonded to a corrugated cardboard 9A. 2 and 3 show the front liner 9B side (outer surface of the packaging box 1). In the present specification, the direction parallel to the corrugated cardboard sheet 9A is referred to as the "step direction", and the direction orthogonal to the step direction 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. 3, the blank 5 includes a pair of end walls 10A, a pair of side walls 10B, a pair of lower inner flaps 11A, a pair of lower outer flaps 11B, a pair of upper inner flaps 12A, and a pair. It is equipped with an upper outer flap 12B.

<End wall, side wall>
The pair of end walls 10A and the pair of side walls 10B are alternately connected from one side to the other in the flow direction via the first folding curve L1. The end wall 10A and the side wall 10B are formed in a substantially rectangular shape. Specifically, the end wall 10A is formed in a substantially rectangular shape shorter than the side wall 10B in the flow direction. At one end of the end wall 10A in the flow direction, a joint piece 13 is continuously provided via the first folding curve L1.

<Lower inner flap, lower outer flap>
The lower inner flap 11A is continuously provided at one end (lower end) of the end wall 10A in the step direction via the second folding curve L2. The lower inner flap 11A is formed in a substantially rectangular shape, and its dimension in the step direction (extension dimension) is set to be approximately half of the dimension in the flow direction of the end wall 10A. The lower outer flap 11B is continuously provided at one end (lower end) of the side wall 10B in the step direction via the second folding curve L2. The lower outer flap 11B is formed in a substantially rectangular shape, and its extending dimension is substantially the same as the extending dimension of the lower inner flap 11A.

<Upper inner flap, upper outer flap>
The upper inner flap 12A is continuously provided at the other end (upper end) of the end wall 10A in the step direction via the third folding curve L3. The upper inner flap 12A is formed in substantially the same shape as the lower inner flap 11A. The upper outer flap 12B is continuously provided at the other end (upper end) of the side wall 10B in the step direction via the third folding curve L3. The upper outer flap 12B is formed in substantially the same shape as the lower outer flap 11B. In the following description common to the upper inner flap 12A and the upper outer flap 12B, the term "upper flap 12" is simply referred to, and only arithmetic numbers are added to the reference numerals.

The first to third folding curves L1 to L3 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 has a function of bending (normally folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The first to third folding curves L1 to L3 are not limited to general-purpose ruled lines, and may be any structure as long as it has a structure 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.

<Holding part>
The pair of upper inner flaps 12A and the upper outer flaps 12B arranged between them are formed with a holding portion 15 for holding the upper flap 12 in an upright posture with the upper surface opening W1 of the peripheral wall W opened. The holding portion 15 has a pair of insertion holes 20 and a pair of insertion pieces 25. By using the holding portion 15 to put the upper flap 12 in an upright posture, the products housed in the packaging box 1 can be displayed in a pile above the upper end of the peripheral wall W. Further, the upper flap 12 of the empty packaging box 1 can be placed in an upright position and used as a trash can.

The holding unit 15 will be described with reference to FIGS. 2 and 3. FIG. 3 is an enlarged plan view showing a part of the blank 5. Since the pair of insertion holes 20 and the pair of insertion pieces 25 are formed symmetrically in FIG. 2, the following insertion holes 20 and one insertion piece 25 are provided unless otherwise specified. The explanation will be focused on.

(Insert hole)
As shown in FIG. 2, a pair of insertion holes 20 are formed on both sides of the upper outer flap 12B in the flow direction. Specifically, the pair of insertion holes 20 are formed at positions inside the upper and outer flaps 12B from both ends in the flow direction. The insertion hole 20 is opened by pushing in a pair of closing pieces 20B defined by the cut line 20A formed in the upper outer flap 12B.

As shown in FIG. 3, the cut line 20A is formed by arranging a plurality of cuts on the upper outer flap 12B in a substantially H shape. A pair of insertion folding lines L5 are formed on the tip end side and the base end side (root side) of the upper outer flap 12B so as to connect the ends of the substantially H-shaped cut lines 20A. The pair of insertion folding lines L5 extend substantially parallel to the flow direction. The pair of closing pieces 20B are formed in a range surrounded by the cut line 20A and the pair of insertion folding lines L5. In other words, the pair of closing pieces 20B are connected to the upper and outer flaps 12B via the pair of insertion folding lines L5. Further, the closing pieces 20B are formed in a substantially trapezoidal shape, and the tips of the pair of closing pieces 20B are butted against each other.

(Insert piece)
As shown in FIG. 2, the pair of insertion pieces 25 are formed on the pair of upper inner flaps 12A. Specifically, the pair of insertion pieces 25 are formed on the side of the pair of upper inner flaps 12A adjacent to the upper outer flap 12B having the insertion hole 20. The insertion piece 25 is partitioned by a cutting line 25A extending from the tip of the upper inner flap 12A in the step direction toward the root side. That is, the insertion piece 25 is composed of an end portion (part) of the upper inner flap 12A which is on the side of the insertion hole 20 with respect to the cutting line 25A, and is extended in the vertical direction in the upright upper inner flap 12A. There is.

As shown in FIG. 3, the insertion piece 25 is continuously provided to the upper inner flap 12A via the inclined folding line L6 on the base end side (root side) in the step direction. The inclined folding line L6 is inclined upward from the root side of the cutting line 25A toward the upper outer flap 12B (insertion hole 20) with the upper inner flap 12A standing upright. In the first embodiment, as an example, the inclination angle of the inclined folding line L6 is set to 45 degrees with respect to the third folding curve L3, but the inclination angle is not limited to this and can be freely set.

An engaging portion 251 is formed on the tip end side of the insertion piece 25, and a connecting portion 252 connecting the engaging portion 251 and the upper inner flap 12A is formed on the base end side (root side) of the insertion piece 25. ing. The engaging portion 251 is formed in a substantially trapezoidal shape that gradually widens in the flow direction from the proximal end side to the distal end side. The connecting portion 252 is formed in a substantially trapezoidal shape with the inclined folding line L6 as the hypotenuse. The engaging portion 251 is formed to have a width (width in the flow direction) equal to or larger than the connecting portion 252 (the root side of the insertion piece 25). Further, the width of the engaging portion 251 on the tip end side (at least the tip end) in the flow direction is set to be equal to or larger than the length (inner diameter) of the insertion hole 20 (pair of closing pieces 20B) in the step direction.

The cutting line 25A described above is formed along the contours of the connecting portion 252 and the engaging portion 251. That is, the cutting line 25A extends from the lowermost end of the inclined folding line L6 toward the tip of the upper inner flap 12A substantially parallel to the step direction, and the upper outer flap 12B (insertion) is formed at the boundary between the connecting portion 252 and the engaging portion 251. It bends away from the hole 20) and extends diagonally to the vicinity of the tip of the upper inner flap 12A. The cutting line 25A does not reach the tip of the upper inner flap 12A, and a connecting portion 25B is formed between the tip of the cutting line 25A and the tip of the upper inner flap 12A. Further, a connecting portion 25B is also formed in the middle of the cutting line 25A. On the root side (butting portion) of the cutting line 25A, a curved portion 25C curved toward the center side in the flow direction of the upper inner flap 12A is formed.

The insertion fold line L5 and the inclined fold line L6 are general-purpose ruled lines, but are not limited to these, and any structure such as a lead ruled line for bending a corrugated cardboard sheet may be used.

[Assembly of packaging box]
Next, the assembly process of the packaging box 1 will be described. The packaging box 1 may be manually assembled by an operator, or may be automatically or semi-automatically assembled by an automatic box making machine (not shown). Here, as an example, a case where an operator manually assembles the packaging box 1 will be described. Further, as an initial state before assembling the packaging box 1, the end walls 10A and the 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 13 is the opposite side wall. It is assumed that the packaging box 1 is doubly folded (not shown), which is adhered to the inner surface of 10B.

The operator bends the pair of end walls 10A and the pair of side walls 10B at substantially right angles along the first folding curve L1 to form a substantially square cylindrical peripheral wall W (see FIG. 1). Subsequently, the operator bends the pair of lower inner flaps 11A inside the peripheral wall W along the second folding curve L2, and then bends the pair of lower outer flaps 11B inside the peripheral wall W along the second folding curve L2. Fold it in. The tips of the pair of lower inner flaps 11A are separated, and the tips of the pair of lower outer flaps 11B are butted against each other. The pair of lower outer flaps 11B overlap the pair of lower inner flaps 11A and close the lower surface opening of the peripheral wall W. After that, the operator attaches an adhesive tape (not shown) along the abutting portion of the pair of lower outer flaps 11B, and fixes the pair of lower outer flaps 11B to the pair of end walls 10A.

As a result, the opening on the lower surface of the peripheral wall W is closed, and the bottom surface of the packaging box 1 is formed. The worker houses the product (not shown) inside the peripheral wall W (above the bottom surface).

Next, the operator bends the pair of upper inner flaps 12A inside the peripheral wall W along the third folding curve L3, and then bends the pair of upper outer flaps 12B inside the peripheral wall W along the third folding curve L3. Fold it in. The tips of the pair of upper and inner flaps 12A are separated, and the tips of the pair of upper and outer flaps 12B are butted against each other. The pair of upper outer flaps 12B overlap the pair of upper inner flaps 12A and close the upper surface opening W1 (see FIG. 4) of the peripheral wall W. After that, the operator attaches an adhesive tape along the abutting portion of the pair of upper and outer flaps 12B, and fixes the pair of upper and outer flaps 12B to the pair of end walls 10A.

As a result, the assembly of the packaging box 1 is completed, and the packaging box 1 is in a sealed state (see FIG. 1). The lower outer flap 11B and the upper outer flap 12B may be fixed with an adhesive instead of the adhesive tape.

[Action of holding part]
Next, with reference to FIGS. 4 to 7, the operation of the holding portion 15, that is, the procedure for holding the upper flap 12 in the upright posture will be described. FIG. 4 is a perspective view showing a state in which the insertion piece 25 is folded back. FIG. 5 is a perspective view showing a state in which the tip end portion of the insertion piece 25 is aligned with the insertion hole 20. FIG. 6 is a perspective view showing a state in which the tip end portion of the insertion piece 25 is inserted into the insertion hole 20. FIG. 7 is a perspective view showing the tip end portion of the insertion piece 25 inserted into the insertion hole 20 from the inside. Unless otherwise specified, the description will be focused on one insertion hole 20 and one insertion piece 25.

As shown in FIG. 4, the operator peels (or cuts) the adhesive tape fixing the pair of upper outer flaps 12B, opens the four upper flaps 12, and opens the upper surface opening W1. Next, the operator stands up with the upper inner flap 12A and the upper outer flap 12B adjacent to each other in the circumferential direction, cuts the connecting portion 25B of the cutting line 25A, and inserts the insertion piece 25 cut by the cutting line 25A. Is bent outward along the inclined folding line L6. At this time, since the insertion piece 25 is extended in the vertical direction, the operator grasps the upper end portion (tip portion) of the insertion piece 25 and bends it by pulling it downward (white arrow shown in FIG. 4). reference). The root side (connecting portion 252) of the insertion piece 25 is folded back approximately 180 degrees to a substantially horizontal posture, and overlaps the outer surface of the upper inner flap 12A.

Subsequently, as shown in FIG. 5, the operator bends the connecting portion 252 of the insertion piece 25 at a substantially right angle along the corner portion between the adjacent upper inner flap 12A and the upper outer flap 12B, and the insertion piece. The tip portion (engagement portion 251) of the 25 is brought into contact with the outer surface of the pair of closing pieces 20B. That is, the insertion piece 25 is bent diagonally so that the insertion piece 25 is directed toward the upper outer flap 12B.

Next, as shown in FIGS. 6 and 7, the operator pushes the pair of closing pieces 20B with the fingertips overlapped with the engaging portion 251. Then, the pair of closed pieces 20B are cut along the cut line 20A and opened inward with the insertion folding line L5 as a fulcrum, and the insertion hole 20 starts to open in the upper outer flap 12B. The engaging portion 251 is inserted into the insertion hole 20 from the outside to the inside together with the fingertip of the operator. Since the vertical width of the engaging portion 251 on the tip end side is equal to or larger than the vertical width (inner diameter) of the insertion hole 20, the engaging portion 251 is press-fitted into the insertion hole 20 while bending.

As described above, the upper inner flap 12A and the upper outer flap 12B are held in the upright posture by the insertion piece 25 pushed into the insertion hole 20. In the packaging box 1 according to the first embodiment, the holding portion 15 holds a pair of left and right upper inner flaps 12A and a rear upper outer flap 12B in an upright state.

The worker piles up more products on the products housed inside the peripheral wall W. The upright upper flap 12 suppresses the collapse of the products stacked above the upper end of the peripheral wall W. In addition, the packaging box 1 from which all the products have been taken out can also be used as a trash can.

In the above-mentioned procedure fingertip, a pair of closing pieces 20B were opened when the engaging portion 251 was pushed into the insertion hole 20, but the present invention is not limited to this. For example, only the pair of closing pieces 20B may be pushed in first to open the insertion hole 20, and then the engaging portion 251 may be pushed into the insertion hole 20. Further, in FIG. 7, the front upper outer flap 12B is folded back to the outside of the side wall 10B, but the present invention is not limited to this, and may be cut along the third folding curve L3.

In the packaging box 1 according to the first embodiment described above, the insertion piece 25 is extended in the vertical direction on the upright upper inner flap 12A and is pulled downward toward the end wall 10A (wall body) at the time of bending. It was configured (see the white arrow shown in FIG. 4). According to this configuration, if excessive tension is applied to the insertion piece 25 at the time of bending, the insertion piece 25 is cut toward the end wall 10A, so even if the insertion piece 25 is cut, even if the insertion piece 25 is cut. The insertion piece 25 can be maintained in a state of being connected to the upper inner flap 12A or the end wall 10A. As a result, the separation of the insertion piece 25 can be suppressed, and the function of holding the upper flap 12 in the upright posture can be enabled.

Further, according to the packaging box 1 according to the first embodiment, the insertion piece 25 separated by the cutting line 25A can be bent along the inclined folding line L6 and directed toward the upper and outer flaps 12B (see FIG. 5). As a result, the insertion piece 25 (the tip end portion) can be properly inserted into the insertion hole 20, and the upper flap 12 can be held in an upright state.

Further, according to the packaging box 1 according to the first embodiment, the engaging portion 251 formed on the tip end side of the insertion piece 25 is press-fitted into the insertion hole 20, so that the insertion piece 25 is inserted into the insertion hole. It is possible to suppress the withdrawal from 20. As a result, the upper flap 12 can be stably held in an upright state.

Further, according to the packaging box 1 according to the first embodiment, while the upper flap 12 is closed and used as the packaging box 1, the insertion hole 20 is closed by the closing piece 20B, so that the upper outside No dent is formed on the flap 12B (see FIG. 1). As a result, even if the insertion hole 20 is opened larger than that of a slit or the like, the packaging box 1 can be provided in which the insertion hole 20 is inconspicuous and has an appearance with less unevenness. Further, the closed piece 20B pushed in holds the insertion piece 25 inserted into the insertion hole 20 by the restoring force acting on the bent portion. As a result, it is possible to prevent the insertion piece 25 from coming off from the insertion hole 20.

As shown in FIGS. 6 and 7, the pair of closed pieces 20B remained open inward with the insertion piece 25 inserted into the insertion hole 20, but the present invention is not limited to this. .. For example, as shown in FIG. 8, after the insertion piece 25 is inserted into the insertion hole 20, the pair of closing pieces 20B pushed inward may be closed again to close the insertion hole 20. Thereby, it is possible to provide the packaging box 1 having a good appearance in which the insertion holes 20 are inconspicuous.

[Second Embodiment]
Next, the packaging box 2 according to the second embodiment will be described with reference to FIG. FIG. 9 is a plan view showing the blank 6 of the packaging box 2. 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.

The structure of the holding portion 16 of the packaging box 2 according to the second embodiment is different from that of the holding portion 15 of the packaging box 1 according to the first embodiment.

<Holding part>
The holding portion 16 includes a pair of insertion holes 21 formed on both sides of the upper outer flap 12B in the flow direction, a pair of insertion pieces 26 formed on the insertion hole 21 side of the pair of upper inner flaps 12A, and a pair of insertion pieces 26. have. Since the pair of insertion holes 21 and the pair of insertion pieces 26 are formed symmetrically in FIG. 9, the following insertion holes 21 and one insertion piece 26 are provided unless otherwise specified. The explanation will be focused on.

(Insert hole)
The insertion hole 21 is opened by pushing in a pair of closing pieces 21B defined by the cut line 21A formed in the upper outer flap 12B. The cut line 21A (blocking piece 21B) is formed in a substantially H shape on its side, and a pair of insertion folding lines L7 (general purpose ruled lines) extend in the vertical direction (step direction). To be precise, the closing piece 21B is provided in a posture in which the upper and outer flaps 12B are inclined upward from the center in the flow direction toward the outside. The insertion folding line L7 extends diagonally upward from the outside in the flow direction of the upper outer flap 12B toward the center.

(Insert piece)
The insertion piece 26 is partitioned by a cutting line 26A extending from the tip of the upper inner flap 12A in the step direction toward the root side, and is connected to the upper inner flap 12A via the inclined folding line L6. The cutting line 26A extends in a straight line from the root side to the tip of the upper inner flap 12A. Therefore, the insertion piece 26 is formed in a substantially rectangular shape (substantially trapezoidal shape) having the same width in the flow direction from the root to the tip, and extends in the vertical direction on the upright upper inner flap 12A. The width of the insertion piece 26 is set to be equal to or longer than the length (inner diameter or height) of the insertion holes 21 (pair of closing pieces 21B) in the step direction.

An insertion auxiliary folding line L8 (general-purpose ruled line) is formed on the tip end side of the insertion piece 26 to bend the tip end side of the insertion piece 26 in the process of being inserted into the insertion hole 21. The insertion auxiliary folding line L8 extends diagonally from the tip corner of the insertion piece 26 toward the base end side (root side) so as to approach each other, and is connected at the base end side to form a substantially V shape. There is. Further, on the tip end side of the insertion piece 26, a notch line 26B that meshes with the edge of the insertion hole 21 when inserted into the insertion hole 21 is formed. The cut line 26B extends substantially parallel to the third folding curve L3 from the vicinity of the base end (near the apex of the V shape) of the insertion auxiliary folding line L8 to the cutting line 26A.

The packaging box 2 is assembled (sealed) in the same procedure as the packaging box 1 according to the first embodiment.

[Action of holding part]
Next, the operation of the holding portion 16 will be briefly described with reference to FIG. FIG. 10 is a perspective view showing a state in which the tip end portion of the insertion piece 26 is inserted into the insertion hole 21.

The operator opens the four upper flaps 12, stands up with the upper inner flap 12A and the upper outer flap 12B adjacent to each other in the circumferential direction, and inserts the insertion piece 26 cut by the cutting line 26A along the inclined folding line L6. And fold it outward. The operator bends the insertion piece 26 in a substantially horizontal posture along the corners of the adjacent upper inner flap 12A and upper outer flap 12B, and pushes the tip end portion of the insertion piece 26 into the insertion hole 21. The tip side of the insertion piece 26 with respect to the cutting line 26B is bent by the insertion auxiliary folding line L8 to open a pair of closing pieces 21B and press-fitted into the insertion hole 21. When the tip side of the insertion piece 26 with respect to the cutting line 26B is inserted into the insertion hole 21, the edge portion of the insertion hole 21 is engaged with the cutting line 26B. The tip end side of the insertion piece 26 bent by the insertion auxiliary folding line L8 returns to its original state by its own restoring force (there is a slight folding habit).

As described above, the upper inner flap 12A and the upper outer flap 12B are held in the upright posture.

According to the packaging box 2 according to the second embodiment described above, the separation of the insertion piece 26 can be suppressed, the function of holding the upper flap 12 in the upright posture can be enabled, and the like. The same effect as that of the packaging box 1 according to the embodiment can be obtained.

Further, according to the packaging box 2 according to the second embodiment, the insertion piece 26 is separated from the insertion hole 21 by engaging the cutting line 26B of the insertion piece 26 with the edge of the insertion hole 21. Can be suppressed. As a result, the upper flap 12 can be stably held in an upright state.

Further, according to the packaging box 2 according to the second embodiment, the insertion piece 26 can be easily inserted into the insertion hole 21 by bending and bending at the insertion auxiliary folding line L8 at the tip end side of the insertion piece 26. can. As a result, the work of putting the upper flap 12 into the upright posture can be smoothly performed.

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

In the packaging box 3 according to the third embodiment, the structure of the holding portions 17 is different from the holding portions 15 and 16 of the packaging boxes 1 and 2 according to the first and second embodiments.

<Holding part>
The holding portion 17 includes a pair of insertion holes 22 formed on both sides of the upper outer flap 12B in the flow direction, a pair of insertion pieces 27 formed on the insertion hole 22 side of the pair of upper inner flaps 12A, and the like. have. Since the pair of insertion holes 22 and the pair of insertion pieces 27 are formed symmetrically in FIG. 11, the following insertion holes 22 and one insertion piece 27 are provided unless otherwise specified. The explanation will be focused on.

(Insert hole)
The insertion hole 22 is opened by pushing in a pair of closing pieces 22B defined by the cut line 22A formed in the upper outer flap 12B. The insertion hole 22 (cut line 22A, block piece 22B) has a posture in which the upper side of the insertion hole 20 (cut line 20A, block piece 20B) of the packaging box 1 according to the first embodiment is inclined so as to approach each other. Is formed in. The blocking piece 22B is connected to the upper and outer flaps 12B via the insertion folding line L9 (general-purpose ruled line).

(Insert piece)
The insertion piece 27 is formed in substantially the same shape as the insertion piece 25 of the packaging box 1 according to the first embodiment. The insertion piece 27 is integrally formed with the engaging portion 251 and the connecting portion 252. An insertion auxiliary folding line L10 (general-purpose ruled line) is formed on the tip end side of the insertion piece 27 to bend the tip end side of the insertion piece 27 in the process of being inserted into the insertion hole 22. The insertion auxiliary folding line L10 extends obliquely downward from the bent portion of the cutting line 25A toward the end portion of the upper inner flap 12A in the flow direction. That is, the insertion auxiliary folding line L10 is inclined in the opposite direction to the inclined folding line L6.

The packaging box 3 is assembled (sealed) in the same procedure as the packaging box 1 according to the first embodiment.

[Action of holding part]
Next, the operation of the holding portion 17 will be briefly described with reference to FIG. FIG. 12 is a perspective view showing a state in which the tip end portion of the insertion piece 27 is inserted into the insertion hole 22.

The operator opens the four upper flaps 12, stands up with the upper inner flap 12A and the upper outer flap 12B adjacent to each other in the circumferential direction, and inserts the insertion piece 27 cut by the cutting line 25A along the inclined folding line L6. And fold it inward. The operator directs the tip end side of the inwardly bent insertion piece 27 toward the adjacent upper and outer flaps 12B, and pushes the tip end portion of the insertion piece 27 into the insertion hole 22 from the inside. The tip end side (engagement portion 251) of the insertion piece 27 is bent and bent at the insertion auxiliary folding line L10 to open a pair of closing pieces 22B and press-fitted into the insertion hole 22. The engaging portion 251 bent by the insertion auxiliary folding line L10 returns to its original position by its own restoring force after being inserted into the insertion hole 22 (it has a slight folding habit).

As described above, the upper inner flap 12A and the upper outer flap 12B are held in the upright posture.

According to the packaging box 3 according to the third embodiment described above, the separation of the insertion piece 27 can be suppressed, the function of holding the upper flap 12 in the upright posture can be enabled, and the like. The same effect as that of the packaging box 1 according to the embodiment can be obtained. Further, since the tip end side of the insertion piece 27 is bent and bent at the insertion auxiliary folding line L10, the insertion piece 27 can be easily inserted into the insertion hole 22. As a result, the work of putting the upper flap 12 into the upright posture can be smoothly performed.

In the packaging boxes 1 and 2 according to the first and second embodiments, the insertion pieces 25 and 26 were inserted into the insertion holes 20 and 21 from the outside, but the present invention is not limited to this. Like the insertion piece 27 of the packaging box 3, the insertion pieces 25 and 26 may be inserted into the insertion holes 20 and 21 from the inside. Further, the insertion piece 27 of the packaging box 3 according to the third embodiment may be inserted into the insertion holes 20 and 21 from the outside.

Further, in the packaging boxes 1 and 3 according to the first and third embodiments, the engaging portion 251 of the insertion pieces 25 and 27 is formed wider than the connecting portion 252, but the present invention is not limited thereto. For example, as in the insertion piece 26 of the packaging box 2 according to the second embodiment, the insertion pieces 25 and 27 may be formed with the same width from the root to the tip (not shown). Further, the tip end side of the insertion piece 26 of the packaging box 2 according to the second embodiment may be formed wider than the root side (not shown).

Further, in the packaging boxes 2 and 3 according to the second and third embodiments, the insertion holes 21 and 22 (cut lines 21A and 22A, closing pieces 21B and 22B) are formed diagonally, but the present invention is not limited to this. , The insertion hole 20 and the like of the packaging box 1 according to the first embodiment may be formed substantially parallel to the third folding curve L3. Further, the insertion holes 20 and the like of the packaging box 1 according to the first embodiment may be inclined like the insertion holes 21 and 22 and the like of the packaging boxes 2 and 3 according to the second and third embodiments. That is, the insertion holes 20 to 22 may be formed at positions where the obliquely bent insertion pieces 25 to 27 can be inserted.

Further, the cut line 26B, which is a feature of the packaging box 2 according to the second embodiment, may be applied to the packaging boxes 1 and 3 according to the first and third embodiments (not shown).

In the packaging boxes 1 to 3 according to the first to third embodiments, the holding portions 15 to 17 (a pair of insertion holes 20 to 22 and a pair of insertion pieces 25 to 27) have a pair of upper and inner flaps 12A. And one upper outer flap 12B, but the present invention is not limited to this. For example, a pair of insertion holes 20 may be formed in the other upper outer flap 12B (not shown). That is, the holding portions 15 to 17 (one insertion hole 20 to 22, one insertion piece 25 to 27) are formed in a pair of upper flaps 12 adjacent to at least in the circumferential direction among the plurality of upper flaps 12. Just do it.

Further, in the packaging boxes 1 to 3 according to the first to third embodiments, the insertion holes 20 to 22 are formed in the upper outer flap 12B, and the insertion pieces 25 to 27 are formed in the upper inner flap 12A. , The present invention is not limited to this. The insertion holes 20 to 22 may be formed on the upper inner flap 12A, and the insertion pieces 25 to 27 may be formed on the upper outer flap 12B (not shown).

Further, in the packaging boxes 1 to 3 according to the first to third embodiments, the insertion holes 20 to 22 are closed by a pair of closing pieces 20B, 21B, 22B, but the present invention is not limited to this. For example, the insertion holes 20 to 22 may be closed by one blocking piece 20B, 21B, 22B, or the closing pieces 20B, 21B, 22B are omitted and the insertion holes 20 to 22 are opened in the upper flap 12. It may be (neither is shown).

Further, in the packaging boxes 1 to 3 according to the first to third embodiments, the insertion pieces 25 to 27 (on the tip side) are formed wider than the insertion holes 20 to 22, but the present invention is not limited to this. It may be formed to have the same width as the insertion holes 20 to 22 or narrower than the insertion holes 20 to 22 (not shown). In this case, it is preferable to bend the tip side of the insertion pieces 25 to 27 inserted into the insertion holes 20 to 22 so that the tip side of the insertion pieces 25 to 27 does not separate from the insertion holes 20 to 22.

Further, in the packaging boxes 1 to 3 according to the first to third embodiments, the inclined folding line L6 for diagonally folding the insertion pieces 25 to 27 is formed, but the inclined folding line L6 may be omitted (the inclined folding line L6 may be omitted. Not shown).

Further, in the packaging boxes 1 to 3 according to the first to third embodiments, the insertion pieces 25 to 27 are formed by cutting a part of the upper inner flap 12A by the cutting lines 25A and 26A. The invention is not limited to this. For example, the insertion pieces 25 to 27 may be separated from the upper inner flap 12A by a groove having a width (not shown). Further, for example, as shown in FIG. 13, the insertion piece 25 may be configured independently of the upper inner flap 12A and may extend upward from the upper end (third folding curve L3) of the end wall 10A. The modified example shown in FIG. 13 may be applied to the insertion pieces 26 and 27 of the packaging boxes 2 and 3 according to the second and third embodiments (not shown).

Further, the packaging boxes 1 to 3 according to the first to third embodiments are formed of a double-sided corrugated cardboard sheet made of paper, but the present invention is not limited thereto. The packaging boxes 1 to 3 may be formed of single-sided corrugated cardboard, double-sided corrugated cardboard, double-sided double-sided corrugated cardboard, or the like, or may be made of thick paper, a resin plate (sheet), or the like.

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 technical scope of the present invention is not limited to the above-described 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.

1,2,3 Packaging box 10A End wall (wall body)
10B side wall (wall body)
12A Upper inner flap (flap)
12B Upper and outer flaps (flaps)
15, 16, 17 Holding part 20, 21, 22, Insert hole 20A, 21A, 22A Cut line 20B, 21B, 22B Blocking piece 25, 26, 27 Insert piece 25A, 26A Cutting line 26B Cutting line 251 Engagement part L6 Inclined folding line L8, L10 Insertion auxiliary folding line W Peripheral wall W1 Top surface opening

Claims (6)

A peripheral wall (W) formed in a cylindrical shape by connecting a plurality of wall bodies (10A, 10B) in the circumferential direction,
A plurality of flaps (12A, 12B) which are connected to the upper ends of the plurality of wall bodies and close the upper surface opening (W1) of the peripheral wall,
A holding portion (15, 16, 17) formed on a pair of the flaps adjacent to each other at least in the circumferential direction among the plurality of the flaps and holding the pair of the flaps in an upright posture with the upper surface opening opened is provided. ,
The holding part is
Insertion holes (20,21,22) formed in one of the pair of flaps.
An insertion piece (an insertion piece that is vertically extended in the other flap of the pair of upright flaps and is bent diagonally so as to be directed toward one of the flaps and inserted into the insertion hole from the inside or the outside. 25, 26, 27), and a packaging box characterized by having. The insert is partitioned by cutting lines (25A, 26A) extending from the tip of the other flap toward the root side.
With the other flap upright, the insert is bent along an inclined folding line (L6) inclined upward from the root end of the cutting line toward one of the flaps. The packaging box according to claim 1. Claim 1 is characterized in that an engaging portion (251) formed in a width equal to or larger than the root side of the insertion piece and press-fitted into the insertion hole is formed on the tip end side of the insertion piece. Or the packaging box according to 2. Any one of claims 1 to 3, wherein the insertion piece is formed with a cut line (26B) that meshes with the edge of the insertion hole in a state of being inserted into the insertion hole. The packaging box according to item 1. An insertion auxiliary folding line (L8, L10) for bending the tip side of the insertion piece in the process of being inserted into the insertion hole is formed on the tip side of the insertion piece. The packaging box according to any one of claims 1 to 4. Claim 1 is characterized in that the insertion hole is opened by pushing in a closing piece (20B, 21B, 22B) partitioned by a cut line (20A, 21A, 22A) formed in one of the flaps. The packaging box according to any one of 5 to 5.

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