JP2020189651A - Packaging box and sealing structure of package - Google Patents

Abstract

To provide a packaging box capable of opening/closing easily.SOLUTION: A packaging box 1 includes: a box body 1A formed in a cylindrical shape by a pair of first side walls 10 and a pair of second side walls 11; a pair of first extension walls 14 connected to the pair of first side walls 10; a pair of second extension walls 16 connected to the pair of second side walls 11; four connection walls connected to the first extension walls 14 via an extension folding line L6 and connected to the second extension walls 16 via an inclined folding line L7; and a pair of locking pieces 18 connected to the pair of connection walls via a locking folding line L8. In a sealed state where the first extension walls 14 and the second extension walls 16 are folded inside and inclined, and the connection walls are folded between the first extension walls 14 and the second extension walls 16, the locking piece 18 is valley-folded at the locking folding line L8, is inserted in an insertion port formed between the opposing first extension wall 14 and the connection wall, and is pressed to the ridge-folded extension folding line L6 from the inside, and the sealed state is maintained.SELECTED DRAWING: Figure 5

Description

The present invention relates to a packaging box configured to be openable and closable and a sealing structure of the packaging body.

The sealed container described in Patent Document 1 is provided on four side surfaces / bottom surfaces forming a square columnar shape, a first extension portion connected to the upper end of the first side surface, and an inner surface of the upper end of the first extension portion. The engaging step portion, the second extension portion connected to the upper end of the second side surface facing the first side surface, and the third extension portion connected to the upper end of the second extension portion. Was equipped with. The first extension portion was provided with a notch below the engagement step portion. The tip of the third extension was provided with a bent end that was bent outward by an elastic fold. In order to seal this sealed container, the first extension portion and the second extension portion are bent in a direction approaching each other while inserting the third extension portion under the first extension portion, and the first extension portion is sealed. On the back surface of the portion, the bent end was engaged with the engaging step portion. To open this sealed container, the cut was pushed down to disengage the bent end from the engaging step.

Jikken Sho 45-21222

However, in the above-mentioned sealed container, the sealed container cannot be easily sealed because the bent end must be engaged with the engaging step portion on the back surface of the first extension portion that cannot be seen by the operator. .. Further, in order to disengage the bent end from the engaging step portion, a cut must be provided in the first extension portion that is easily visible to the public, and the design of the sealed container is deteriorated.

The present invention provides a packaging box and a packaging structure that can be easily opened and closed in order to solve the above problems.

In order to achieve the above object, the packaging box of the present invention has a pair of first extension walls arranged to face each other in the first direction and a pair of first extension walls arranged to face each other in a second direction orthogonal to the first direction. The second extension wall and the first extension wall are connected to the first extension wall via an extension fold curve, and are connected to the second extension wall via an inclined fold curve extending diagonally with respect to the extension fold curve. A locking fold curve is formed on the four connecting walls provided and the tips of the pair of connecting walls located on the side of one of the first extension walls, or the tips of the pair of connecting walls located diagonally. A pair of locking pieces connected to each other are provided, the first extension wall and the second extension wall are inclined inward, the connecting wall is mountain-folded by the extension folding curve, and the inclination is formed. In the sealed state of being valley-folded along the folding curve and folded between the first extension wall and the second extension wall, the locking piece is valley-folded along the locking curve and opposed to the first. It is inserted into an insertion port formed between the extension wall and the connecting wall, and is pressed from the inside against the mountain-folded extension folding curve to maintain the sealed state.

Further, in order to achieve the above-mentioned object, in the packaging box of the present invention, a pair of first side walls and a pair of second side walls are alternately arranged to form a tubular body, and a pair of the first side walls. A pair of first extension walls connected to one end of one side wall, a pair of second extension walls connected to one end of the pair of second side walls, and the first side wall and the second side wall. The second extension wall is connected to the first extension wall through an extension fold curve extending along the boundary line of the above, and is obliquely extended from one end of the boundary line. Locked to the four connecting walls connected to the above and the tip of the pair of connecting walls located on the side of one of the first extension walls, or the tip of the pair of connecting walls diagonally located. A pair of locking pieces connected via a curved line are provided, and the first extension wall and the second extension wall are folded inward and inclined, and the connecting wall is mountain-folded by the extension folding curve. In a sealed state in which the locking pieces are valley-folded along the inclined folding curve and folded between the first extension wall and the second extension wall, the locking pieces are valley-folded along the locking folding curve and face each other. It is inserted into the insertion port formed between the first extension wall and the connecting wall, and is pressed from the inside against the mountain-folded extension fold curve to maintain the sealed state.

In this case, a pair of picking pieces connected to the tip of the first extension wall via a tip folding curve is provided, and in the sealed state, the pair of picking pieces are valley-folded along the tip folding curve. It is preferable that they overlap each other.

In this case, the tip of the connecting wall to which the locking pieces are connected is formed parallel to the base end of the second extension wall, and the locking piece is at least the tip of the connecting wall. It is preferable that they are continuously provided on the first extension wall side.

In this case, the tips of the pair of inclined fold curves formed between the second extension wall and the pair of connecting walls coincide with each other on the proximal end side of the locking fold curve and have vertices. The tip of the connecting wall that is formed and forms the insertion port is inclined toward the base end side from the tip of the extension folding curve toward the apex of the inclined folding curve, and is locked in the sealed state. It is preferable that the pieces come into contact with each other along the surface of the connecting wall.

Further, in order to achieve the above object, the present invention has a pair of first extension walls arranged to face each other in the first direction and a pair of first extension walls arranged to face each other in a second direction orthogonal to the first direction. The second extension wall is connected to the first extension wall via an extension fold curve, and is connected to the second extension wall via an inclined fold curve extending diagonally with respect to the extension fold curve. It is a sealing structure of a package including the four connecting walls, and a pair of tips of the connecting walls located on the side of one of the first extension walls, or a pair of the above diagonally located. A pair of locking pieces are continuously provided at the tip of the connecting wall via a locking folding curve, the first extension wall and the second extension wall are inclined inward, and the connecting wall is the said. In a sealed state in which a mountain fold is made along an extension fold curve and a valley fold is made along the sloping fold curve and folded between the first extension wall and the second extension wall, the locking piece is the locking fold. It is valley-folded along a curve, inserted into an insertion port formed between the first extension wall and the connecting wall facing each other, and pressed from the inside against the mountain-folded extension-fold curve to maintain the sealed state. To do.

According to the present invention, the packaging box can be easily opened and closed.

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 which shows the state which formed the box body of the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view which shows the process of closing the upper surface of the box body of the packaging box which concerns on 1st Embodiment of this invention. It is a perspective view which shows the locking piece which is the packaging box which concerns on 1st Embodiment of this invention, and is inserted into the insertion port by cutting out a part of the 1st extension wall. It is a perspective view which shows the packaging box which concerns on 1st modification of 1st Embodiment of this invention. It is a perspective view which shows the packaging box which concerns on the 2nd modification of 1st Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on the 3rd modification of 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.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In each figure, "Fr" indicates "front", "Rr" indicates "rear", "L" indicates "left", "R" indicates "right", and "U" indicates "right". "Upper" is indicated, and "D" is "lower". In addition, the terms indicating these directions are used for convenience of explanation and do not limit the technical scope of the present invention.

[First Embodiment: Outline of packaging box]
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 gable-top paper pattern container having a gable roof structure on the upper part of a square tubular box body 1A extending in the vertical direction.

The packaging box 1 is assembled from the blank 5 shown in FIG. The blank 5 is formed by punching a sheet of paperboard (thick paper) with a die or the like. Note that FIG. 2 shows the front side, “X” shown in FIG. 2 indicates the “paper grain direction” in which the paper fibers (paper grain) extend, and “Y” indicates the “orthogonal direction” orthogonal to the paper grain direction. Is shown. Further, in the present specification, terms indicating up / down, left / right, front / back, and similar directions refer to directions in the assembled state (assembled state) of the packaging box 1.

[Blank of packaging box]
The blank 5 of the packaging box 1 will be described with reference to FIG. The blank 5 includes a pair of first side walls 10, a pair of second side walls 11, a pair of lower inner flaps 12, a pair of lower outer flaps 13, a pair of first extension walls 14, and a pair of picking pieces 15. A pair of second extension walls 16, four connecting walls 17, and a pair of locking pieces 18 are provided.

<1st side wall, 2nd side wall>
The pair of first side walls 10 and the pair of second side walls 11 are alternately arranged side by side in the grain direction, and are continuously provided via a vertical folding curve L1. The first side wall 10 and the second side wall 11 are formed in a substantially rectangular shape having substantially the same size. Specifically, the first side wall 10 and the second side wall 11 are formed in a substantially rectangular shape in which the length in the orthogonal direction (vertical direction) is longer than the width in the paper grain direction. A main body joint piece 20 is continuously provided on the first side wall 10 located at the outer end in the paper grain direction via a vertical folding curve L1. The main body joint piece 20 is formed in a substantially trapezoidal shape in which the width gradually narrows from the base end (the side of the vertical folding curve L1) toward the tip end.

<Lower inner flap>
The pair of lower inner flaps 12 are continuously provided at the lower ends of the pair of second side walls 11 via the lower transverse curve L2. The lower inner flap 12 is formed in a substantially trapezoidal shape in which the width gradually narrows from the base end (the side of the lower horizontal bending curve L2) toward the tip end. The dimension (extended dimension) of the lower inner flap 12 in the orthogonal direction is set to be substantially half of the dimension of the second side wall 11 in the paper grain direction.

<Lower outer flap>
The pair of lower outer flaps 13 are continuously provided at the lower ends of the pair of first side walls 10 via the lower transverse curve L2. The lower outer flap 13 is formed in a substantially rectangular shape, and its orthogonal direction dimension (extension dimension) is set longer than the extension dimension of the lower inner flap 12. A meshing recess 22 is cut out from the tip end to the base end in the middle portion in the orthogonal direction of the lower outer flap 13. The lower outer flap 13 is formed with a bottom folding curve L3 that extends diagonally from the meshing recess 22 toward the side of the second side wall 11.

<1st extension wall>
The pair of first extension walls 14 are connected to the upper end portion (one end portion in the orthogonal direction) of the pair of first side walls 10 via the upper horizontal bending curve L4. The first extension wall 14 is formed in a substantially rectangular shape, and its orthogonal direction dimension (extension dimension) is set to be slightly shorter than the extension dimension of the lower outer flap 13. A roof joint piece 21 is continuously provided on the first extension wall 14 on the side of the main body joint piece 20 via an extension folding curve L6. The roof joint piece 21 is formed in a substantially trapezoidal shape in which the width gradually narrows from the base end to the tip end. The roof joint piece 21 is obliquely formed with an auxiliary folding curve L9 that matches the inclined folding curve L7 described later in the assembled state.

<Picked piece>
The pair of picking pieces 15 are continuously provided at the tip portions of the pair of first extension walls 14 via the tip folding curve L5. The picking piece 15 is formed in a substantially rectangular shape, and its orthogonal direction dimension (extension dimension) is set to 1/3 or less of the extension dimension of the first extension wall 14.

<Second extension wall>
The pair of second extension walls 16 are connected to the upper ends of the pair of second side walls 11 via the upper horizontal bending curve L4. The second extension wall 16 is formed in an isosceles triangle shape with the upper horizontal bending curve L4 as the base. The dimension of the second extension wall 16 in the orthogonal direction (distance from the upper transverse curve L4 to the apex V) is set to be slightly shorter than the extension dimension of the lower inner flap 12.

<Connecting wall>
The four connecting walls 17 are connected to the first extension wall 14 via the extension fold curve L6, and are connected to the second extension wall 16 via the inclined fold curve L7. The extension fold curve L6 extends along the vertical fold curve L1 (the boundary line between the first side wall 10 and the second side wall 11). The inclined folding curve L7 extends diagonally from the upper end (one end) of the vertical folding curve L1 with respect to the extended folding curve L6. In other words, the inclined folding curve L7 corresponds to the hypotenuse of the second extension wall 16 forming a triangle. The tips of the pair of inclined folding curves L7 formed between the second extension wall 16 and the pair of connecting walls 17 coincide with each other on the proximal end side (lower side) of the locking folding curve L8 described later. Form a vertex V. To be precise, the connecting wall 17 located on the opposite side of the roof joint piece 21 in the blank 5 state is not connected to the first extension wall 14. When the packaging box 1 is in the assembled state, the connecting wall 17 is continuously provided to the first extension wall 14 via the roof joint piece 21.

In the state of the blank 5, the two connecting walls 17 connected to both ends of the first extension wall 14 in the paper grain direction are formed in a substantially trapezoidal shape that is line-symmetrical with the first extension wall 14 as the center. ing. On the other hand, in the state of the blank 5, the other two connecting walls 17 except for the two trapezoidal connecting walls 17 are formed in a substantially triangular shape having line symmetry around the first extension wall 14. In the following description, for convenience, the trapezoidal connecting wall 17 is referred to as a "first connecting wall 17A", the triangular connecting wall 17 is referred to as a "second connecting wall 17B", and the first connecting wall 17A. In the description common to the second connecting wall 17B, it is simply referred to as "connecting wall 17".

The tip end portion (one side of the upper end) of the first connecting wall 17A is formed parallel to the upper horizontal bending curve L4 (base end portion of the second extension wall 16). The phrase "the tip of the connecting wall 17 is parallel to the upper-transverse curve L4" means that not only is it perfectly parallel, but also an inclination of an error is allowed.

On the other hand, the tip end portion (one side of the upper end) of the second connecting wall 17B is inclined toward the base end side (downward) from the tip end of the extension folding curve L6 toward the apex V of the inclined folding curve L7 (second extension wall 16). ing. That is, a defect portion 23 cut out in a substantially triangular shape is formed on the upper portion of the second connecting wall 17B, and the tip portion of the second connecting wall 17B is the tip of the first connecting wall 17A on the apex V. It is one step lower than the department.

<Locking piece>
The pair of locking pieces 18 form a main part of the sealing structure of the packaging box 1. The pair of locking pieces 18 are attached to the tip end portion (upper end portion) of the pair of first connecting walls 17A (the pair of connecting walls 17 located on the side of the one first extension wall 14) via the locking folding curve L8. It is installed continuously. The locking piece 18 is formed in a substantially rectangular shape, and its orthogonal direction dimension (extension dimension) is set to be the same as the extension dimension of the picking piece 15. Further, the end portion of the locking piece 18 adjacent to the picking piece 15 in the paper grain direction is slightly displaced toward the apex V from the extension folding curve L6.

The vertical fold curve L1, the lower horizontal fold curve L2, the upper horizontal fold curve L4, the tip fold curve L5, and the extension fold curve L6 are general-purpose ruled lines in which the paperboard is linearly recessed from the surface. The general-purpose ruled line is provided to bend the paperboard so that the back surface (or front surface) faces inward. The bottom fold curve L3, the inclined fold curve L7, the locking fold curve L8, and the auxiliary fold curve L9 are lead ruled lines in which a plurality of cuts are formed at predetermined intervals on a general-purpose ruled line. The lead ruled line is provided to bend (valley fold) the paperboard so that the surface faces inward. These folding curves L1 to L8 are not limited to general-purpose ruled lines and lead ruled lines, and may be any line such as a sewing machine blade line for bending paperboard.

[Assembly and seal of packaging box]
Next, a procedure for assembling and sealing the packaging box 1 will be described with reference to FIGS. 1, 3 to 5. FIG. 3 is a perspective view showing a state in which the box body 1A is formed. FIG. 4 is a perspective view showing a process of closing the upper surface of the box body 1A. FIG. 5 is a perspective view showing a locking piece 18 inserted into the insertion port 24 by cutting out a part of the first extension wall 14.

Although not shown, it is assumed that the packaging box 1 before assembly is folded substantially flat. Specifically, in the blank 5 (see FIG. 2), the first side wall 10 and the second side wall 11 on both sides in the grain direction are folded inward along a vertical folding curve L1, and the back surface (inner surface) of the folded second side wall 11 is folded back. ), The main body joint piece 20 is adhered. Further, the roof joint piece 21 is adhered to the back surface of the connecting wall 17 on the opposite side, and the connecting wall 17 is continuously provided to the first extension wall 14 via the roof joint piece 21. As a result, the pair of first side walls 10 and the pair of second side walls 11 are alternately provided in series to form a flatly crushed square tubular box body 1A. Further, the corner portion of the lower outer flap 13 defined by the bottom folding curve L3 is adhered to the surface (outer surface) of the lower inner flap 12. Further, the lower inner flap 12 is mountain-folded along the lower horizontal folding curve L2, the lower outer flap 13 is mountain-folded along the lower horizontal folding curve L2 while the lower outer flap 13 is valley-folded along the bottom folding curve L3, and the lower inner flap 12 and the lower outer flap 13 are folded. And put inside the box body 1A. As a result, the packaging box 1 is in a state of being folded substantially flat.

As shown in FIG. 3, the operator bends the first side wall 10 and the second side wall 11 along a vertical curve L1 so as to be orthogonal to each other. The pair of first side walls 10 are arranged to face each other in the front-rear direction (first direction), and the pair of second side walls 11 are arranged to face each other in the left-right direction (second direction orthogonal to the first direction). By raising the folded packaging box 1 in this way, a substantially square tubular box body 1A is formed.

The bottom surface of the packaging box 1 is a so-called one-touch bottom formed in conjunction with the box body 1A that is deformed into a square cylinder. That is, in the process of forming the square tubular box body 1A, the lower inner flap 12 and the lower outer flap 13 are extruded from the inside to the outside (downward) of the box body 1A, and the lower outer flap 13 has a bottom folding curve L3. It starts to return to flat from the folded state (not shown). When the pair of lower outer flaps 13 return to flat, the meshing recesses 22 are in mesh with each other (not shown). As described above, the lower inner flap 12 and the lower outer flap 13 close the lower surface opening of the box body 1A, and the bottom surface of the packaging box 1 is formed (not shown). Then, the worker accommodates an article (not shown) inside the box body 1A.

Next, as shown in FIG. 4, the operator inclines the pair of first extension walls 14 and the pair of second extension walls 16 inward to form a gable roof on the upper part of the box body 1A.

Specifically, the operator pushes the pair of second extension walls 16 inward. Then, the second extension wall 16 is folded in a valley along a pair of inclined folding curves L7 and mountain-folded along an upper horizontal folding curve L4 to incline inward. The first extension wall 14 is pulled by the second extension wall 16 that falls inward, and while being mountain-folded along the extension folding curve L6, the first extension wall 14 is mountain-folded along the upper-lateral folding curve L4 and inclined inward. Further, in the process in which the first extension wall 14 and the second extension wall 16 are inclined inward, the connecting wall 17 is mountain-folded along the extension fold curve L6 and valley-folded along the slope fold curve L7 to be the first extension wall. It is folded between 14 and the second extension wall 16. The first extension wall 14 and the second connecting wall 17B are folded so as to approach each other to form an insertion port 24. The insertion port 24 is a substantially triangular gap formed between the first extension wall 14 and the connecting wall 17 facing each other at a predetermined angle. In the process of folding the connecting wall 17, the operator can visually check the insertion port 24 from above.

Next, the operator folds the pair of locking pieces 18 in a valley along the locking folding curve L8, and visually inserts the pair of locking pieces 18 into the pair of insertion ports 24. While inserting the locking piece 18 into the insertion port 24, the operator abuts the tips of the pair of first extension walls 14 against each other, and overlaps the pair of picking pieces 15 that are valley-folded along the tip folding curve L5. As described above, the first extension wall 14, the second extension wall 16, and the like close the upper opening of the box body 1A, and a gable roof structure is formed. That is, the packaging box 1 is in a sealed state (hereinafter, also referred to as a “sealed state”). Further, in the sealed state, the tip end portion (upper end portion) of the second connecting wall 17B (connecting wall 17 forming the insertion port 24) is the first connecting wall 17A (connecting wall 17 to which the locking pieces 18 are continuously provided). ) Along the surface (see FIG. 5).

As shown in FIG. 5, in the sealed state, the locking piece 18 inserted into the insertion port 24 is pressed from the inside against the mountain-folded extension folding curve L6 to hold the sealed state of the packaging box 1. .. More specifically, a force (repulsive force) for returning the first extension wall 14 to its original position is acting around the upper-horizontal turn curve L4 due to the stiffness of the paperboard or the like. Similarly, a force (repulsive force) for returning the connecting wall 17 to its original position acts around the extended folding curve L6 and the inclined folding curve L7. Since these repulsive forces act in the direction of opening the pair of locking pieces 18 to the left and right both outwards, the locking pieces 18 are pressed against the inner surface of the mountain-folded extended folding curve L6. As a result, the locking piece 18 is suppressed from being pulled out from the insertion port 24, so that the packaging box 1 can be kept in a sealed state.

According to the packaging box 1 according to the first embodiment described above, since the locking piece 18 and the insertion port 24 appear at the upper end of the box body 1A (see FIG. 4), the operator can use the locking piece 18 Can be visually performed while inserting the device into the insertion port 24. Further, in the packaging box 1, the locking piece 18 inserted into the insertion port 24 is pressed against the mountain-folded extension folding curve L6 (the bent portion between the first extension wall 14 and the connecting wall 17). It was configured to be caught (see FIG. 5). According to this configuration, the locking piece 18 caught on the extended folding curve L6 is restricted from being pulled out, so that the sealed state of the packaging box 1 can be maintained.

Further, by deforming the first extension wall 14 and the connecting wall 17 so that the locking piece 18 is separated from the extension folding curve L6, the locking piece 18 can be easily pulled out from the insertion port 24. Specifically, when the user puts a finger on the pair of first connecting walls 17A and pulls them diagonally upward and forward, the locking piece 18 can be lightly pulled out from the insertion port 24, and the packaging box 1 can be easily opened. be able to. The opened packaging box 1 can be sealed again. As described above, it is not necessary to make cuts in the first and second extension walls 14, 16 and the like in order to open the packaging box 1, and the upper end of the box body 1A is pressed while maintaining the good design of the packaging box 1. It can be easily opened and closed.

Further, in the packaging box 1 according to the first embodiment, in the sealed state, the pair of picked pieces 15 are valley-folded along the tip folding curve L5 and overlap each other, so that the pair of picked pieces 15 are upward from the abutting portion of the pair of first extension walls 14. It was extended to. According to this configuration, the locking piece 18 inserted into the insertion port 24 can be hidden by the pair of overlapping picking pieces 15, and the design of the packaging box 1 can be improved. In addition, the user can pick up the packaging box 1 by picking the pair of overlapping picking pieces 15. Further, when the user pulls the pair of picking pieces 15 apart from each other, the locking piece 18 can be pulled out from the insertion port 24, and the packaging box 1 can be easily opened. Further, since the picked piece 15 extends upward from the apex of the gable roof, it is possible to form a design that seems to be a gable top type.

Further, according to the packaging box 1 according to the first embodiment, the upper portion of the second connecting wall 17B forming the insertion port 24 is cut out and is one step lower than the upper end of the facing first connecting wall 17A. , The outlet 24 can be widened. This makes it easy to insert the locking piece 18 into the insertion port 24. Further, since the upper ends of the second connecting wall 17B are in contact with each other following the surface of the first connecting wall 17A facing each other in the sealed state (see FIG. 5), a clean packaging box 1 with few gaps can be constructed.

[First modification]
In the packaging box 1 according to the first embodiment, the dimensions of the locking piece 18 and the first connecting wall 17A in the paper grain direction are substantially the same, but the present invention is not limited to this. Since it is sufficient that the left and right outer ends of the pair of locking pieces 18 are pressed against the mountain-folded extension folding curve L6, for example, as shown in FIG. 6, the locking piece 18 is the first connecting wall 17A. It may be continuously provided only on the first extension wall 14 side of the tip portion of the above. By narrowing the width of the locking piece 18 in this way, the locking piece 18 can be easily inserted into the insertion port 24.

[Second modification]
Further, in the packaging box 1 according to the first embodiment, the pair of locking pieces 18 are connected to the pair of connecting walls 17 located in the front, folded back, and inserted into the insertion port 24. , The present invention is not limited to this. For example, as shown in FIG. 7, the pair of locking pieces 18 may be connected to the tips of the pair of connecting walls 17 located diagonally (when viewed from a plane). In this case, one locking piece 18 is folded back and inserted into the insertion port 24, and the other locking piece 18 is folded forward and inserted into the insertion port 24.

[Third variant]
Further, in the packaging box 1 according to the first embodiment, the tip end portion (one side) of the first connecting wall 17A to which the locking pieces 18 are continuously provided is formed in parallel with the upper-transverse curve L4. Is not limited to this. For example, as shown in FIG. 8, the first connecting wall 17A has a shape in which the second connecting wall 17B is inverted, and the tip of the first connecting wall 17A is the tip of the second connecting wall 17B. It may be tilted in the opposite direction. In this case, the locking piece 18 may be inclined according to the inclination of the tip portion of the first connecting wall 17A.

Further, in the packaging box 1 according to the first embodiment (including the first to third modified examples; the same applies hereinafter), the vertical folding curve L1 is formed in a straight line, but the present invention is not limited to this, and the curve is curved. It may be formed in a shape other than a straight line, such as bent or wavy (not shown). Further, in the packaging box 1, the inclined folding curve L7 is formed in a straight line, but the present invention is not limited to this, and the inclined folding curve L7 may be formed in a curved arc shape (not shown).

Further, in the packaging box 1 according to the first embodiment, the pair of picking pieces 15 is provided at the uppermost portion, but the pair of picking pieces 15 may be omitted. In this case, the abutting portion of the upper ends of the pair of first extension walls 14 becomes the uppermost portion of the packaging box 1 (not shown).

[Second Embodiment]
Next, the packaging box 2 according to the second embodiment will be described with reference to FIGS. 9 and 10. 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. The same components as those of the packaging box 1 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The packaging box 2 according to the second embodiment is different from the packaging box 1 according to the first embodiment in that the box body 1A is omitted. Specifically, as shown in FIG. 10, the lower inner flap 12 is continuously provided at the lower end portion of the second extension wall 16 via the lower transverse curve curve L2. The lower outer flap 13 is continuously provided at the lower end portion of the first extension wall 14 via the lower transverse curve curve L2. The roof joint piece 21 is continuously provided at the end of the second extension wall 16 in the step direction via the extension folding curve L6. Further, the pair of inclined folding curves L7 formed on each of the second extension walls 16 extend diagonally upward from the lower part of the extended folding curve L6. Each inclined folding curve L7 is curved in an arc shape so as to bulge toward both outer sides in the step direction. The pair of picking pieces 15 (tip folding curve L5) is omitted, and the pair of first extension walls 14 extend to the same position as the tip of the locking piece 18. In other words, the upper part of the first extension wall 14 has the same function as the picking piece 15.

In the blank 6 (see FIG. 10), the first extension wall 14 and the second extension wall 16 on both sides in the grain direction are folded inward along an extension folding curve L6, and a roof joint is attached to the back surface of the folded first extension wall 14. The substitute piece 21 is adhered. Further, similarly to the packaging box 1 according to the first embodiment, the lower inner flap 12 and the lower outer flap 13 are adhered to each other and folded inward. As a result, the packaging box 2 is in a state of being folded substantially flat (not shown).

As shown in FIG. 9, the operator bends the first extension wall 14 and the second extension wall 16 along an extension fold curve L6 so as to be orthogonal to each other to form a one-touch bottom of the packaging box 2. Then, the worker accommodates the article (not shown) through the opening on the upper surface of the packaging box 2. After that, the operator folds the connecting wall 17 in a mountain fold along the extension fold curve L6 and valley folds along the slope fold curve L7 while inclining the pair of first extension walls 14 and the pair of second extension walls 16 inward. , The locking piece 18 is inserted into the insertion port 24 formed between the first extension wall 14 and the connecting wall 17. In this state, the upper ends of the pair of first extension walls 14 are butted against each other. As a result, the packaging box 2 is sealed.

According to the packaging box 2 according to the second embodiment described above, the same effects as those of the packaging box 1 according to the first embodiment can be obtained, such as facilitating opening and closing of the upper surface opening.

Although not shown, the characteristics of the packaging box 1 according to the first to third modifications of the first embodiment may be applied to the packaging box 2 according to the second embodiment.

Further, in the packaging box 2 according to the second embodiment, the picking piece 15 is omitted, but similarly to the packaging box 1 according to the first embodiment, the picking piece 15 is continuously provided at the upper end portion of the first extension wall 14. May (not shown)

In the packaging boxes 1 and 2 according to the first and second embodiments, the locking pieces 18 are formed in a substantially rectangular shape, but the present invention is not limited to this. The locking piece 18 may have a shape that is in contact with the extension folding curve L6 while being inserted into the insertion port 24, and may be formed into a polygonal shape other than a rectangle or a semicircular shape, for example. Good (not shown).

Further, in the packaging boxes 1 and 2 according to the first and second embodiments, the second extension wall 16 is formed in a substantially isosceles triangle shape with the upper horizontal folding curve L4 as the base, but the present invention is not limited to this. It may be formed in a triangular shape that is asymmetrical about the perpendicular line from the apex V of the triangle to the base (not shown).

In the packaging boxes 1 and 2 according to the first and second embodiments, the gable roof structure (sealing structure) formed by the first extension wall 14, the second extension wall 16, the connecting wall 17, and the locking piece 18 is provided. The present invention is not limited to this, although it has been continuously provided on the upper part of the square tubular box body 1A or on the bottom surface of the packaging box 2. For example, the gable roof structure formed by the first extension wall 14, the second extension wall 16, the connecting wall 17, and the locking piece 18 may be connected to the bag-shaped package (not shown). ). With this configuration, the package can be easily opened and closed.

Further, the packaging boxes 1 and 2 according to the first and second embodiments are formed of paperboard (single-layer paper), but the present invention is not limited to this, and for example, they may be formed of a corrugated cardboard sheet or a resin. It may be formed of a plate made of.

The description of the above embodiment shows one aspect of the packaging box and the sealing structure of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1, 2, Packaging box 1A Box body 10 1st side wall 11 2nd side wall 14 1st extension wall 15 Picking piece 16 2nd extension wall 17 Connecting wall 18 Locking piece 24 Outlet L1 Vertical folding curve (boundary line)
L5 Tip fold curve L6 Extension fold curve L7 Inclined fold curve L8 Locking fold curve

Claims (6)

A pair of first extension walls (14) arranged to face each other in the first direction,
A pair of second extension walls (16) arranged to face each other in the second direction orthogonal to the first direction, and
Connected to the first extension wall via an extension fold curve (L6) and connected to the second extension wall via an inclined fold curve (L7) extending diagonally with respect to the extension fold curve. With the four connecting walls (17)
A pair of connecting walls located on the side of the first extension wall, or a pair of diagonally located tips of the connecting walls, are continuously provided via a locking fold curve (L8). With a pair of locking pieces (18)
The first extension wall and the second extension wall are inclined inward, and the connecting wall is mountain-folded along the extension folding curve and valley-folded along the inclined folding curve to form the first extension wall and the second extension wall. In the sealed state folded between the extension wall and the locking piece, the locking piece is valley-folded along the locking folding curve, and an insertion port formed between the first extension wall and the connecting wall facing each other. A packaging box that is inserted into (24) and pressed from the inside against the mountain-folded extension-folded curve to maintain the sealed state. A box body (1A) in which a pair of first side walls (10) and a pair of second side walls (11) are alternately arranged to form a tubular shape, and
A pair of first extension walls (14) connected to one end of the first side wall,
A pair of second extension walls (16) connected to one end of the second side wall,
It is connected to the first extension wall through an extension fold curve (L6) extending along the boundary line (L1) between the first side wall and the second side wall, and is oblique from one end of the boundary line. Four connecting walls (17) connected to the second extension wall via an inclined folding curve (L7) extending to the second extension wall, and
A pair of connecting walls located on the side of the first extension wall, or a pair of diagonally located tips of the connecting walls, are continuously provided via a locking fold curve (L8). With a pair of locking pieces (18)
The first extension wall and the second extension wall are folded inward and inclined, and the connecting wall is mountain-folded along the extension fold curve and valley-folded along the inclined fold curve to form the first extension wall and the above. In the sealed state folded between the second extension wall, the locking piece is valley-folded along the locking fold curve, and the difference formed between the facing first extension wall and the connecting wall. A packaging box that is inserted into the inlet (24) and pressed from the inside against the mountain-folded extension-folded curve to maintain the sealed state. A pair of picking pieces (15) connected to the tip of the first extension wall via a tip folding curve (L5) are provided.
The packaging box according to claim 1 or 2, wherein in the sealed state, the pair of the picked pieces are valley-folded along the tip folding curve and overlap each other. The tip end portion of the connecting wall to which the locking pieces are continuously provided is formed parallel to the base end portion of the second extension wall.
The packaging box according to any one of claims 1 to 3, wherein the locking piece is connected to at least the tip end portion of the connecting wall on the side of the first extension wall. The tips of the pair of inclined fold curves formed between the second extension wall and the pair of connecting walls coincide with each other on the proximal end side of the locking fold curve to form vertices.
The tip of the connecting wall forming the insertion port is inclined toward the base end side from the tip of the extension folding curve toward the apex of the inclined folding curve, and the locking pieces are connected in a sealed state. The packaging box according to claim 4, wherein the packaging box is in contact with the surface of the connecting wall provided. A pair of first extension walls (14) arranged to face each other in the first direction, a pair of second extension walls (16) arranged to face each other in a second direction orthogonal to the first direction, and an extension fold. It was connected to the first extension wall via a curve (L6), and was connected to the second extension wall via an inclined folding curve (L7) extending diagonally with respect to the extension folding curve. It is a sealing structure of a package provided with four connecting walls (17).
A pair of tips of the pair of connecting walls located on the side of the first extension wall, or a pair of tips of the connecting walls located diagonally, via a locking fold curve (L8). Locking pieces (18) are connected in series,
The first extension wall and the second extension wall are inclined inward, and the connecting wall is mountain-folded along the extension fold curve and valley-folded along the slope fold curve to form the first extension wall and the second extension wall. In the sealed state folded between the extension wall and the locking piece, the locking piece is valley-folded along the locking folding curve, and an insertion port formed between the first extension wall and the connecting wall facing each other. A sealing structure of a package, which is inserted into (24) and pressed from the inside against the mountain-folded extended folding curve to maintain the sealed state.

Images