JP2021031126A - Packaging box and opening structure of packaging box - Google Patents

Abstract

To provide a packaging box which can be opened properly.SOLUTION: A packaging box 1 includes: a peripheral wall 1W including a pair of side walls 12 continuously provided on both end parts in a first direction of a back wall 11(first side wall); and an opening cutting line 30 formed on the back wall 11 so as to connect between the back wall 11 and a pair of ridge lines (first folding line L1) which is the boundary with the pair of side walls 12. In further one side of a second direction orthogonal to the first direction than the opening cutting line 30, the back wall 11 is cut along the opening cutting line 30 being pushed inside and is separated in the second direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging box and an opening structure of the packaging box.

As shown in FIG. 11, Patent Document 1 discloses a technique for removing (opening) the upper portion of the packaging box 100 by means of cut lines 102 or the like provided around the four side surfaces 101. A cut line 102 extending horizontally and a pair of cut lines 104 extending vertically downward from the cut line 102 are formed on the back surface portion 103 of the packaging box 100. A holding portion 105 is formed between the pair of cut lines 104 extending vertically downward. The user pushes the pressing portion 105, hooks a finger on the open space, pulls the back portion 103 toward (rear) to cut along the horizontal cut line 102, and then pulls up the back portion 103 to pull up the packaging box 100. The upper part of the was removed.

Japanese Unexamined Patent Publication No. 2016-216126

However, in the above-mentioned packaging box 100, it is necessary for the user to perform an operation of pulling the back surface portion 103 toward the front (rear) and then pulling up the back surface portion 103. In general, a user who is not familiar with the opening procedure of the packaging box 100 often pulls up the back surface 103 without pulling the back 103 toward the front. If the user pulls up the back portion 103 without pulling the back portion 103 toward the front, the back portion 103 is not cut by the horizontally extended cut line 102 as shown in FIG. Sometimes it broke at the part where I hung my finger. In this case, it was not possible to cut along the cut line 102, and the packaging box 100 could not be opened properly.

In order to solve the above problems, the present invention provides a packaging box that can be opened properly and an opening structure of the packaging box.

In order to achieve the above object, the packaging box of the present invention has a peripheral wall including a pair of second side walls connected to both ends of the first side wall in the first direction, and a pair of the first side wall and the second side wall. An opening cutting line formed on the first side wall so as to connect between a pair of ridge lines that are boundaries with the side wall, and in one of the second directions orthogonal to the first direction from the opening cutting line. The first side wall is divided in the second direction by being pushed and cut along the opening cutting line.

In this case, it is preferable that the opening cutting line is curved or bent so as to protrude toward the other in the second direction with respect to the imaginary straight line linearly connecting the pair of the ridge lines.

In this case, the maximum value of the perpendicular line extending from the virtual straight line to the opening cutting line is preferably set within a range exceeding 0 and equal to or less than the dimension of the first side wall in the first direction.

In this case, the opening cutting line extends from the pair of the ridge lines toward the center of the first direction, and a pair of first curves that bulge toward one of the second directions and incline to the other in the second direction. It is preferable to include a second curved portion formed so as to connect the portion and the pair of the first curved portions and bulging toward the other in the second direction.

In this case, a pair of auxiliary ruled lines formed on the first side wall in one of the second directions from the opening cutting line and inclined so as to approach each other as they move away from the opening cutting line in one of the second directions are further provided. Is preferable.

In this case, a pair of first opening cutting lines formed continuously on both ends of the opening cutting line on the pair of the second side walls and dividing the pair of the second side walls in the second direction are further provided, and the opening is further provided. The first continuous cutting portion that connects the cutting line and the first opening cutting line preferably intersects the ridge line.

In this case, the peripheral wall is formed in a square tube shape by alternately connecting a pair of the first side wall and a pair of the second side walls via the ridge line, and is formed in a pair with the pair of the first side walls. A plurality of flaps for closing both end faces of the peripheral wall in the second direction are continuously provided at both ends in the second direction with the second side wall, and the opening cutting line is any one of the pair of the first side walls. It is formed on one side, and on any one of the pair of the first side walls, a second opening cutting line for dividing the first side wall is formed so as to connect both ends of the pair of the first opening cutting lines. It is preferable that the second continuous cutting portion that connects the first opening cutting line and the second opening cutting line intersects the ridge line.

Further, in order to achieve the above object, the present invention is an opening structure of a packaging box including a pair of second side walls connected to both ends of the first side wall in the first direction, and the first side wall and the first side wall. A second side wall is provided with an opening cutting line formed on the first side wall so as to connect between the pair of ridge lines that are boundaries with the pair of the second side walls, and is orthogonal to the opening cutting line in the first direction. On the other hand, the first side wall is divided in the second direction by being pushed and cut along the opening cutting line.

In this case, it is preferable that the opening cutting line is curved or bent so as to protrude toward the other in the second direction orthogonal to the first direction with respect to the virtual straight line linearly connecting the pair of the ridge lines.

According to the present invention, the packaging box can be opened properly.

It is a perspective view which shows the packaging box which concerns on one Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on one Embodiment of this invention. It is a top view which shows the opening structure of the blank of the packaging box which concerns on one Embodiment of this invention in an enlarged manner. FIG. 5 is a perspective view showing a state in which the back wall of the packaging box according to the embodiment of the present invention is divided. It is a perspective view which shows the process of dividing the packaging box which concerns on one Embodiment of this invention up and down. It is a perspective view which shows the state which removed the upper part of the packaging box which concerns on one Embodiment of this invention. FIG. 5 is an enlarged plan view showing an opened structure of a blank of a packaging box according to a first modification of an embodiment of the present invention. FIG. 5 is an enlarged plan view showing an opened structure of a blank of a packaging box according to a second modification of an embodiment of the present invention. FIG. 5 is an enlarged plan view showing an opened structure of a blank of a packaging box according to a third modification of an embodiment of the present invention. It is an enlarged plan view which shows the opening structure of the blank of the packaging box which concerns on 4th modification of 1 Embodiment of this invention. It is a perspective view which shows the packaging box which concerns on the prior art.

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". Further, the left-right direction (first direction) is orthogonal to the up-down direction (second direction orthogonal to the first direction), and the front-back direction is orthogonal to the left-right direction and the up-down direction. Although terms indicating directions and positions are used in the present specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention.

[Outline of packaging box]
The configuration of the packaging box 1 will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing a packaging box 1. FIG. 2 is a plan view showing a blank 5 of the packaging box 1.

As shown in FIG. 1, the packaging box 1 is formed in a substantially rectangular parallelepiped shape elongated in the vertical direction. Although details will be described later, a cutting line for opening is formed on the peripheral surface of the packaging box 1 (peripheral wall 1W).

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed by punching a sheet of paperboard (for example, a multi-layered cardboard) by punching or the like. Note that FIG. 2 shows the outer surface (surface) side of the packaging box 1. Further, "X" shown in the drawing indicates a "paper grain direction" in which a paper fiber (paper grain) extends, and "Y" indicates a "orthogonal direction (second direction)" orthogonal to the paper grain direction. In addition, terms such as top, bottom, left, right, front, and back refer to the orientation of the packaging box 1 in the assembled state.

[blank]
As shown in FIG. 2, the blank 5 includes a joint piece 10, a back wall 11 (first side wall), a right side wall 12R (second side wall), a front wall 13 (first side wall), and a left side wall 12L. (Second side wall), a pair of upper flaps 14, an upper inner flap 15, an upper outer flap 16, a pair of lower lower flaps 17, a lower inner flap 18, and a lower outer flap 19. ing.

<Section piece, back wall, right side wall, front wall, left side wall>
The joint piece 10, the back wall 11, the right side wall 12R, the front wall 13 and the left side wall 12L are arranged in a row in this order in the paper grain direction, and are continuously provided via the first folding curve L1. The back wall 11, the right side wall 12R, the front wall 13 and the left side wall 12L are formed in a substantially rectangular shape elongated in the orthogonal direction. The back wall 11 and the front wall 13 have substantially the same outer shape. The right side wall 12R and the left side wall 12L have substantially the same outer shape, and the dimensions of the right side wall 12R and the left side wall 12L in the grain direction are set longer than the dimensions of the back wall 11 and the like in the grain direction. The joint piece 10 is formed in a substantially trapezoidal shape that gradually shortens in the orthogonal direction from the back wall 11 toward the outside in the grain direction. Further, as will be described in detail later, the joint piece 10, the back wall 11, the right side wall 12R, the front wall 13 and the left side wall 12L are provided with an opening structure 26 for vertically dividing and opening the packaging box 1. Has been done.

<Upper flap>
The pair of upper flaps 14 are continuously provided at one end (upper end) in the orthogonal direction between the back wall 11 and the front wall 13 via the second folding curve L2. The tip corner portion of each upper flap 14 is chamfered, and each upper flap 14 is formed in a substantially hexagonal shape. The dimension (extended dimension) of each upper flap 14 in the orthogonal direction is set to be shorter than half of the dimension in the grain direction of the right side wall 12R or the like.

<Upper flap>
The upper inner flap 15 is continuously provided at one end (upper end) in the orthogonal direction of the left side wall 12L via the second folding curve L2. The upper inner flap 15 is formed in a substantially trapezoidal shape that gradually narrows in the grain direction toward the tip. The dimension (extension dimension) of the upper inner flap 15 in the orthogonal direction is set to be slightly shorter than the dimension in the grain direction of the front wall 13 and the like.

An upper push-in cutting line 20 curved so as to protrude from the boundary (second folding curve L2) with the upper inner flap 15 is formed at the central portion of the left side wall 12L in the paper grain direction. The upper push-in cutting line 20 includes a plurality of cuts arranged side by side at intervals so as to form a substantially semicircular shape. In the region surrounded by the upper push-in cutting line 20 and the second folding curve L2, a substantially semicircular upper push-in piece 21 is formed. Further, at the boundary between the left side wall 12L and the upper inner flap 15 (on the second folding curve L2), a pair of upper separation cutting lines 22 extend from both ends of the upper pushing cutting line 20 toward the outside in the grain direction. It is installed. Each upper separation cutting line 22 is a zipper in which a plurality of cuts bent in a substantially L shape are arranged side by side along the second folding curve L2. The pair of upper separation cutting lines 22 have a function of cutting the upper inner flap 15 from the center in the grain direction toward the outside.

<Upper outer flap>
The upper outer flap 16 is continuously provided at one end (upper end) in the orthogonal direction of the right side wall 12R via the second folding curve L2. The upper outer flap 16 is formed in a substantially rectangular shape, and its orthogonal direction dimension (extension dimension) is set to be substantially the same as the paper grain direction dimension of the front wall 13 and the like.

<Lower side flap, lower inner flap, lower outer flap>
The pair of lower lateral flaps 17 are continuously provided at the other end (lower end) in the orthogonal direction between the back wall 11 and the front wall 13 via the third folding curve L3. Each lower flap 17 has a shape symmetrical with the upper flap 14 centered on the back wall 11 and the like. Further, the lower inner flap 18 is continuously provided at the other end in the orthogonal direction of the left side wall 12L via the third folding curve L3, and the lower outer flap 19 is connected to the other end in the orthogonal direction of the right side wall 12R via the third folding curve L3. It is connected to the department. The lower inner flap 18 has a shape symmetrical with the upper inner flap 15 centering on the left side wall 12L, and the lower outer flap 19 has a shape symmetrical with the upper outer flap 16 centering on the right side wall 12R.

A lower push-in cutting line 23 (lower push-in piece 24) curved so as to protrude from the boundary (third folding curve L3) with the lower inner flap 18 is formed in the central portion of the left side wall 12L in the paper grain direction. Further, at the boundary between the left side wall 12L and the lower inner flap 18 (on the third folding curve L3), a pair of lower separation cutting lines 25 extend from both ends of the lower pushing cutting line 23 toward the outside in the grain direction. Has been done. The lower push-in cutting line 23 (lower push-in piece 24) and each lower separation cutting line 25 have a shape symmetrical with the upper push-in cutting line 20 (upper push-in piece 21) and each upper separation cutting line 22 centering on the left side wall 12L. is there.

The first to third folding curves L1 to L3 are general-purpose ruled lines recessed linearly from the surface of the paperboard, respectively. The first to third folding curves L1 to L3 are not limited to general-purpose ruled lines, and may be any line for folding paperboard, such as a lead ruled line in which a plurality of cuts are arranged at predetermined intervals on the general-purpose ruled line. ..

<Opening structure>
Next, the opening structure 26 for opening the packaging box 1 will be described with reference to FIGS. 2 and 3. FIG. 3 is an enlarged plan view showing the opening structure 26 of the blank 5.

As shown in FIG. 2, the opening structure 26 includes an opening cutting line 30, a pair of auxiliary ruled lines 35, a pair of first opening cutting lines 36, and a second opening cutting line 37. The opening cutting line 30 is formed on the back wall 11. The pair of first opening cutting lines 36 are formed on the right side wall 12R and the left side wall 12L. The second opening cutting line 37 is formed on the front wall 13. Since the pair of first opening cutting lines 36 have a symmetrical shape centered on the front wall 13, one first opening cutting line 36 will be described below, unless otherwise specified. Further, in the present specification, when the right side wall 12R and the left side wall 12L are collectively described, they are simply referred to as "side wall 12", and only arithmetic numbers are added as reference numerals.

(Aperture cutting line)
As shown in FIG. 3, the opening cutting line 30 is a sewing machine blade line formed by making a plurality of cuts in the back wall 11. The opening cutting line 30 is a pair of ridge lines (first folding curve) between the back wall 11 and the pair of left and right side walls 12 (to be exact, the right side wall 12R and the joint piece 10) in the state where the packaging box 1 is assembled. It is formed on the back wall 11 so as to connect between L1) (see FIG. 1). Further, the opening cutting line 30 is formed by being curved so as to protrude downward (the other in the second direction) with respect to the virtual straight line S linearly connecting the pair of ridge lines (first folding curve L1). ing. Both ends of the opening cutting line 30 in the paper grain direction (horizontal direction) are in contact with (cross) a pair of ridge lines (first folding curve L1).

The opening cutting line 30 extends from the pair of ridge lines (first folding curve L1) toward the center in the grain direction (left-right direction), and bulges upward (one of the second directions) and downwards (first). It includes a pair of first curved portions 30A inclined in the other direction) and a second curved portion 30B formed so as to connect between the pair of first curved portions 30A and bulging downward. The first curved portion 30A and the second curved portion 30B are arranged side by side with the inflection point P in between, and are formed in a gentle substantially S shape. The opening cutting line 30 as a whole is formed in a substantially V-shape (or a substantially U-shape) in which the central portion in the grain direction (left-right direction) protrudes downward. In the present embodiment, as an example, the maximum value V of the perpendicular line extending from the virtual straight line S to the opening cutting line 30 is set to about 8 mm. A substantially triangular push-in portion 38 is formed in the region surrounded by the opening cutting line 30 and the virtual straight line S. Although the details will be described later, when the pushing portion 38 is pushed in, the back wall 11 is divided into two by the opening cutting line 30.

(Auxiliary ruled line)
As shown in FIG. 3, the pair of auxiliary ruled lines 35 are general-purpose ruled lines formed on the back wall 11 above the opening cutting line 30 (one of the second directions). The pair of auxiliary ruled lines 35 are inclined so as to approach each other as they move upward from the opening cutting line 30. That is, the pair of auxiliary ruled lines 35 are formed in a substantially C shape. The upper end of each auxiliary ruled line 35 is located in the vicinity of the second folding curve L2 and does not touch (do not intersect) the second folding curve L2. Further, the lower end of each auxiliary ruled line 35 is located in the vicinity of the first folding curve L1 and does not touch (do not intersect) the first folding curve L1. Each auxiliary ruled line 35 is arranged so that the extension line E extending diagonally downward intersects the first folding curve L1 above the virtual straight line S. In each auxiliary ruled line 35, the extension line E intersects the first folding curve L1 within the range of the intersection of the first folding curve L1 and the opening cutting line 30 (the first continuous cutting portion J1 described later) or more. It suffices if it is arranged.

(1st opening cutting line)
As shown in FIG. 2, the first opening cutting line 36 is a sewing machine blade line formed by making a plurality of cuts in the side wall 12. The pair of first opening cutting lines 36 are formed on a pair of side walls 12 continuously at both ends of the opening cutting lines 30 in a state where the packaging box 1 is assembled (see FIG. 1). Further, the first opening cutting line 36 is formed over the entire paper grain direction (front-back direction) of the side wall 12. The first opening cutting line 36 is inclined downward from the side of the back wall 11 toward the side of the front wall 13 in the state where the packaging box 1 is assembled. The first opening cutting line 36 has a function of dividing the side wall 12 in the vertical direction.

The joint piece 10 is formed with an auxiliary cutting line 36A (sewing machine blade line) inclined downward from the back wall 11 toward the outside in the paper grain direction. Although the details will be described later, the auxiliary cutting line 36A substantially coincides with the rear upper portion of the first opening cutting line 36 of the left wall 12L in a state where the joint piece 10 is adhered to the inner surface of the left side wall 12L, and the first opening cutting It functions as part of line 36 (see FIG. 1).

The rear upper end of the first opening cutting line 36 of the right side wall 12R is connected to the end of the opening cutting line 30. The rear upper end of the first opening cutting line 36 of the left side wall 12L is indirectly connected to the end of the opening cutting line 30 via the auxiliary cutting line 36A in a state where the joint piece 10 is adhered to the inner surface of the left wall 12L. (See Fig. 1). The first continuous cutting portion J1 that connects the opening cutting line 30 and the first opening cutting line 36 is a part of the cut and intersects the ridge line (first folding curve L1). That is, the first continuous cutting portion J1 (cut) is formed so as to cross the first folding curve L1.

(2nd opening cutting line)
As shown in FIG. 2, the second opening cutting line 37 is a sewing machine blade line formed by making a plurality of cuts in the front wall 13. The second opening cutting line 37 is formed so as to connect the lower ends of the front portion of the pair of first opening cutting lines 36. That is, the second opening cutting line 37 is formed over the entire paper grain direction (left-right direction) of the front wall 13. The second opening cutting line 37 is formed in a substantially trapezoidal shape that narrows downward in the paper grain direction from the connecting portion (second continuous cutting portion J2) with the pair of first opening cutting lines 36. The second opening cutting line 37 has a function of dividing the front wall 13 in the vertical direction.

The second continuous cutting portion J2 that connects the first opening cutting line 36 and the second opening cutting line 37 is a part of the cut and intersects (the first folding curve L1). That is, the second continuous cutting portion J2 (cut) is formed so as to cross the first folding curve L1.

[Assembly of packaging box]
Next, an example of the assembly procedure of the packaging box 1 will be described. The packaging box 1 may be manually assembled by an operator, or may be assembled fully or semi-automatically by a packaging device. Here, as an example, a case where an operator manually assembles the packaging box 1 will be described. The packaging box 1 (blank 5) is folded along the first folding curve L1 between the back wall 11 and the right side wall 12R and the first folding curve L1 between the front wall 13 and the left side wall 12L. It is assumed that the joint piece 10 is adhered to the inner surface of the left side wall 12L (not shown). In this state, the auxiliary cutting line 36A of the passage piece 10 substantially coincides with the rear upper part of the first opening cutting line 36 of the left side wall 12L. Further, in the present specification, when the back wall 11 and the front wall 13 are collectively described, they are simply referred to as "face walls 11, 13".

The operator raises the packaging box 1 which is folded flat so that the pair of face walls 11 and 13 and the pair of side walls 12 (joint pieces 10) form a substantially right angle. In this state, the pair of face walls 11 and 13 and the pair of side walls 12 (joint pieces 10) are alternately connected with each other via the first folding curve L1 to form a square tubular peripheral wall 1W (FIG. 1). reference).

Next, the operator bends the pair of lower lateral flaps 17 and lower inner flaps 18 inward along the third folding curve L3 in this order. The operator applies an adhesive to the outer surface of the lower inner flap 18 or the inner surface of the lower outer flap 19, bends the lower outer flap 19 inward along the third folding curve L3, and adheres to the lower inner flap 18. As a result, the lower side flap 17, the lower inner flap 18, and the lower outer flap 19 close the lower end surface of the peripheral wall 1W, and the bottom surface of the packaging box 1 is formed (see FIG. 1). In this state, the opening cutting line 30 of the opening structure 26, the pair of first opening cutting lines 36 (auxiliary cutting lines 36A), and the second opening cutting line 37 are formed over the entire circumference of the peripheral wall 1W.

Next, the operator accommodates (places) a plurality of products (for example, rod-shaped products long in the vertical direction) inside the peripheral wall 1W (on the bottom surface). Subsequently, the operator bends the pair of the upper flaps 14 and the upper inner flaps 15 inward along the second folding curve L2 in this order. The operator applies an adhesive to the outer surface of the upper inner flap 15 or the inner surface of the upper outer flap 16, bends the upper outer flap 16 inward along the second folding curve L2, and adheres to the upper inner flap 15. As a result, the upper flap 14, the upper inner flap 15, and the upper outer flap 16 close the upper end surface of the peripheral wall 1W, and the top surface of the packaging box 1 is formed (see FIG. 1).

As a result, the assembly of the packaging box 1 is completed, and the packaging box 1 is sealed (see FIG. 1).

[Opening the packaging box]
Next, a procedure for opening the packaging box 1 using the opening structure 26 (action of the opening structure 26) will be described with reference to FIGS. 4 to 6. FIG. 4 is a perspective view showing a state in which the back wall 11 is divided. FIG. 5 is a perspective view showing a process of dividing the packaging box 1 into upper and lower parts. FIG. 6 is a perspective view showing a state in which the upper portion of the packaging box 1 is removed.

The user pushes in the vicinity of the center of the pushing portion 38 by hand (finger) (see the thick broken line arrow in FIG. 4). Then, as shown in FIG. 4, the back wall 11 (pushing portion 38) is cut along the opening cutting line 30 while being pushed above the opening cutting line 30 (one of the second directions). Since each of the first curved portion 30A and the second curved portion 30B constituting the opening cutting line 30 are formed in a gentle substantially S shape, the pushing force acting near the center of the pushing portion 38 is applied to the second curve. It can be propagated from the portion 30B to the pair of first curved portions 30A. As a result, the back wall 11 can be smoothly cut from the second curved portion 30B to each of the first curved portions 30A.

Further, the back wall 11 (pushing portion 38) is pushed inward while being mountain-folded along the pair of auxiliary ruled lines 35 (while being folded so that the back surface faces inward). As a result, the back wall 11 is broken by the pair of auxiliary ruled lines 35 and greatly flexed, so that the back wall 11 can be easily cut along the opening cutting line 30.

Since the opening cutting line 30 (pushing portion 38) is formed over the entire left-right direction of the back wall 11, the back wall 11 is divided (divided into two) in the vertical direction by being cut along the opening cutting line 30. ) Will be in the state. Further, since the back wall 11 (pushing portion 38) bends inward with pushing, the rear portion of the pair of side walls 12 is pulled inward with pushing of the pushing portion 38. Therefore, when the back wall 11 is pushed in, it is possible to automatically cut from each first continuous cutting portion J1 to the rear upper end portion of each first opening cutting line 36.

As shown in FIG. 5, the user grips the upper part of the back wall 11 with the hand pushing the pushing portion 38 and pulls it so as to tilt it forward (see the thick dashed arrow). The pulling force of the back wall 11 acts on the pair of first opening cutting lines 36, and the pair of side walls 12 are cut along the pair of first opening cutting lines 36. Since the first continuous cutting portion J1 to the rear upper end of each first opening cutting line 36 has already been cut, each first opening cutting is triggered by the rear upper end of each of the cut first opening cutting lines 36. The side wall 12 along the line 36 can be smoothly cut.

When the user further pulls the back wall 11, the force is transmitted from the pair of second continuous cutting portions J2 along the second opening cutting line 37, and the front wall 13 is cut along the second opening cutting line 37. (See FIG. 6). Since each second continuous cutting portion J2 is cut so as to intersect the ridge line (first folding curve L1) between the side wall 12 and the front wall 13, the second opening cutting line is triggered by each second continuous cutting portion J2. The front wall 13 along the 37 can be smoothly cut.

As described above, the user can also divide the pair of side walls 12 and the front wall 13 by simply grasping the divided back wall 11 and pulling it forward. Then, as shown in FIG. 6, the packaging box 1 (peripheral wall 1W) is divided into two in the vertical direction, and the upper portion (upper part of the opening structure 26) of the packaging box 1 is removed to leave the lower portion. Further, the lower part of the product is housed in the lower part of the packaging box 1 from which the upper part has been removed, and the upper part of the product is exposed. The lower part of the packaging box 1 is displayed as it is at a store or the like.

Although not shown, the packaging box 1 can be opened without using the opening structure 26. Specifically, the user can push the upper push piece 21 (see FIG. 1) with a finger to cut along the upper push cutting line 20 (see FIG. 1), and pull up the upper inner flap 15 with the pushed finger. Good. Then, the upper inner flap 15 is cut from the left side wall 12L along the pair of upper separation cutting lines 22 and opened together with the upper outer flap 16. As a result, the upper end surface of the peripheral wall 1W can be opened. Further, even if the lower end surface of the peripheral wall 1W is opened by pushing the lower pushing piece 24 and cutting the lower inner flap 18 along the pair of lower separation cutting lines 25 (see FIG. 1) in the same procedure as described above. Good. Further, by opening the upper and lower end surfaces of the peripheral wall 1W, the packaging box 1 (peripheral wall 1W) can be folded flat. As a result, the unnecessary packaging boxes 1 can be folded and stacked for storage.

In the packaging box 1 according to the present embodiment described above, the opening cutting line 30 extends from the left end to the right end (over the entire area in the left-right direction) of the back wall 11 (first side wall). According to this configuration, for example, the back wall 11 can be cut along the opening cutting line 30 by pushing the region (pushing portion 38) surrounded by the opening cutting line 30 and the virtual straight line S. As a result, the user can divide the back wall 11 in the vertical direction simply by pushing the back wall 11 without pulling the back wall 11 toward the front. As a result, the packaging box 1 can be properly opened only by pulling down the divided back wall 11.

Further, according to the packaging box 1 according to the present embodiment, the maximum value V of the perpendicular line extending from the virtual straight line S to the opening cutting line 30 is set to about 8 mm, so that the entire opening cutting line 30 can be pushed in once. Can be disconnected. That is, the back wall 11 can be easily divided by one action.

In the packaging box 1 according to the present embodiment, as an example, the maximum value V of the perpendicular line extending from the virtual straight line S to the opening cutting line 30 is set to about 8 mm, but the present invention is not limited to this. When the maximum value V of this perpendicular line exceeds the dimension W (about 50 mm in the present embodiment) in the front-rear direction (paper grain direction) of the side wall 12, it is difficult for the applicant to cut the entire opening cutting line 30 by one pushing. It has been confirmed by experiments that this will be the case. From this experimental result, it is preferable that the maximum value V of this perpendicular line is set within a range of more than 0 and not more than the dimension W in the front-rear direction (paper grain direction) of the side wall 12.

[Modification example]
Next, a modified example of the packaging box 1 according to the present embodiment will be described. In the following description, the same or corresponding configurations as those of the packaging box 1 according to the above-described embodiment are designated by the same reference numerals, and the same or corresponding description as that of the packaging box 1 will be omitted.

<First modification, second modification>
In the packaging box 1 according to the present embodiment described above, the opening cutting line 30 has a substantially V-shape protruding downward at the central portion in the left-right direction, but the present invention is not limited to this. As the packaging box 1 according to the first modification, the opening cutting line 31 may be formed by bending, or may be formed so as to protrude downward in a substantially triangular shape, for example, as shown in FIG. Good. The opening cutting line 31 is not limited to a substantially triangular shape, and may be formed into a polygonal shape (square shape, pentagonal shape, etc.) other than the triangular shape (not shown). Further, as the packaging box 1 according to the second modification, as shown in FIG. 8, the opening cutting line 32 may be formed so as to protrude downward in a substantially bathtub shape (trapezoidal shape with curved corners). Good.

<Third modification example>
Further, in the packaging box 1 according to the present embodiment (including the first and second modified examples), the opening cutting lines 30 to 32 (hereinafter, referred to as “opening cutting line 30 and the like”) are larger than the virtual straight line S. Although formed downward, the present invention is not limited to this. As the packaging box 1 according to the third modification, as shown in FIG. 9, the opening cutting line 30 and the like may be formed above the virtual straight line S (in FIG. 9, the opening cutting line 30 is shown). ..

<Fourth modification>
In the packaging box 1 (including the first to third modifications) according to the above-described embodiment, the opening cutting line 30 and the like are shaped so as to protrude downward or upward, but the present invention is limited to this. Not done. As shown in FIG. 10, as the packaging box 1 according to the fourth modification, the opening cutting line 33 may be a straight line that coincides with the virtual straight line S (maximum value V = 0 of the perpendicular line). Even with this configuration, it is possible to obtain the same effect as the above-mentioned packaging box 1 (opening cutting line 30 or the like), such as being able to divide by simply pushing the back wall 11.

In the packaging box 1 according to the present embodiment (including the first to fourth modifications; the same applies hereinafter), the opening cutting lines 30 to 33 are formed on the back wall 11, but the present invention is not limited to this. It may be formed on the wall 13 or the side wall 12 (not shown). That is, the opening cutting lines 30 to 33 may be formed on any one of the plurality of walls constituting the peripheral wall 1W. Further, two opening cutting lines 30 to 33 may be formed on both the back wall 11 and the front wall 13 (or a pair of side walls 12) (not shown). When the two opening cutting lines 30 to 33 are formed on the pair of side walls 12, the pair of first opening cutting lines 36 are formed on the pair of face walls 11 and 13. Further, although the virtual straight line S is set to be substantially horizontal, it may be a straight line slightly inclined to the left or right side (not shown). That is, the opening cutting lines 30 to 33 may be formed so as to be slightly inclined to the left or right side (not shown).

Further, in the packaging box 1 according to the present embodiment, the opening cutting lines 30 to 33, the first opening cutting line 36 (auxiliary cutting line 36A), the second opening cutting line 37, and the like are sewing machine blade lines. The line is not limited to this, and any line for cutting (breaking) the paperboard, such as a zipper, may be used.

Further, in the packaging box 1 according to the present embodiment, the pair of auxiliary ruled lines 35 are formed on the back wall 11, but the pair of auxiliary ruled lines 35 may be omitted (deleted). Further, the pair of first opening cutting lines 36 (auxiliary cutting lines 36A), the first continuous cutting line J1, the second opening cutting line 37, and the second continuous cutting line J2 may be omitted (deleted). In this case, for example, the back wall 11 is divided along the opening cutting line 30, the upper part of the back wall 11 is broken along the pair of first folding curves L1, and then the top surface of the packaging box 1 (each of the upper parts). Flaps 14-16) may be opened (not shown).

Further, in the packaging box 1 according to the present embodiment, the first opening cutting line 36 is inclined downward from the rear end to the front end of the side wall 12, but the present invention is not limited to this. For example, the first opening cutting line 36 may be inclined upward from the rear end to the front end of the side wall 12, or may extend substantially horizontally (not shown). Further, when two opening cutting lines 30 to 33 are formed on the pair of face walls 11 and 13 (or the pair of side walls 12), each first opening cutting line 36 is V-shaped (or A-shaped (inverted)). It may be formed in a V shape) (not shown). Further, although the second opening cutting line 37 is formed in a trapezoidal shape, it may extend substantially horizontally, for example (not shown).

Further, in the packaging box 1 according to the present embodiment, the lower inner flap 18, the lower outer flap 19, the upper inner flap 15 and the upper outer flap 16 have a size (full over flap) capable of substantially closing the end face opening of the peripheral wall 1W. ), But the present invention is not limited to this. For example, a pair of outer flaps with abutting tips may be connected to the peripheral wall 1W (not shown). Further, the upper inner flap 15 and the lower inner flap 18 may be omitted, and the upper outer flap 16 and the lower outer flap 19 may be adhered to the upper flap 14 and the lower lower flap 17. Further, although the upper outer flap 16 and the lower outer flap 19 are fixed by an adhesive, they may be fixed by using an adhesive tape or the like.

Further, in the packaging box 1 according to the present embodiment, the peripheral wall 1W is formed in a square tubular shape, but the present invention is not limited to this. The peripheral wall may include at least a pair of side walls 12 connected to both ends in the left-right direction of the back wall 11 (not shown). The peripheral wall in this case will have a substantially triangular cross section. In addition, the peripheral wall may have a polygonal cross section other than a triangle or a quadrangle (not shown).

Further, the packaging box 1 according to the present embodiment is formed of paperboard, but is not limited to this, and may be formed of, for example, a resin plate, a paper or resin corrugated cardboard sheet, or the like.

The description of the above embodiment shows one aspect of the packaging box and the opening 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 Packaging box 1W Circumferential wall 11 Back wall (first side wall)
12L left side wall (second side wall)
12R right side wall (second side wall)
13 Front wall (first side wall)
14 Upper flap 15 Upper inner flap 16 Upper outer flap 17 Lower lower flap 18 Lower inner flap 19 Lower outer flap 26 Opening structure 30, 31, 32, 33 Opening cutting line 35 Auxiliary ruled line 36 1st opening cutting line 37 2nd Opening cutting line J1 1st continuous cutting part J2 2nd continuous cutting part L1 1st folding curve (ridge line)
S virtual straight line

Claims (9)

A peripheral wall (1W) including a pair of second side walls (12L, 12R) connected to both ends of the first side wall (11) in the first direction,
Opening cutting lines (30, 31, 32, 33) formed on the first side wall so as to connect between the pair of ridge lines (L1) which are the boundaries between the first side wall and the pair of the second side walls. With
The first side wall is divided in the second direction by being pushed along the opening cutting line in one of the second directions orthogonal to the opening cutting line. Packaging box. The first aspect of the present invention, wherein the opening cutting line is curved or bent so as to protrude toward the other in the second direction with respect to a virtual straight line (S) linearly connecting the pair of the ridge lines. Packaging box. The maximum value (V) of the perpendicular line extending from the virtual straight line to the opening cutting line exceeds 0 and is set within a range equal to or less than the dimension (W) in the first direction of the first side wall. The packaging box according to claim 2. The opening cutting line is
A pair of first curved portions (30A) extending from the pair of the ridgelines toward the center of the first direction and bulging toward one of the second directions and inclined to the other in the second direction.
The second or third aspect of the present invention, wherein the second curved portion (30B) formed so as to connect between the pair of the first curved portions and bulging toward the other in the second direction is included. Packaging box. Further provided with a pair of auxiliary ruled lines (35) formed on the first side wall in one of the second directions from the opening cutting line and inclined so as to approach each other as they move away from the opening cutting line in one of the second directions. The packaging box according to any one of claims 1 to 4, wherein the packaging box is characterized in that. A pair of first opening cutting lines (36) formed on a pair of the second side walls continuously at both ends of the opening cutting line and dividing the pair of the second side walls in a second direction are further provided.
The packaging box according to any one of claims 1 to 5, wherein the first continuous cutting portion (J1) that connects the opening cutting line and the first opening cutting line intersects the ridge line. The peripheral wall is formed in a square tube shape by alternately providing a pair of the first side wall and a pair of the second side walls via the ridge line, and the pair of the first side walls and the pair of the first side walls. A plurality of flaps (14 to 19) for closing both end faces of the peripheral wall in the second direction are continuously provided at both ends in the second direction with the two side walls.
The opening cutting line is formed on one of the pair of the first side walls.
On any other of the pair of the first side walls, a second opening cutting line (37) for dividing the first side wall is formed so as to connect both ends of the pair of the first opening cutting lines.
The packaging box according to claim 6, wherein the second continuous cutting portion (J2) that connects the first opening cutting line and the second opening cutting line intersects the ridge line. The opening structure (26) of the packaging box (1) including a pair of second side walls (12L, 12R) connected to both ends of the first side wall (11) in the first direction.
An opening cutting line (30, 31, 32, 33) formed on the first side wall so as to connect between the pair of ridge lines (L1) which is the boundary between the first side wall and the pair of the second side walls is provided. ,
The first side wall is divided in the second direction by being pushed along the opening cutting line in one of the second directions orthogonal to the opening cutting line. The opening structure of the packaging box. The opening cutting line is characterized in that it is curved or bent so as to protrude toward the other in the second direction orthogonal to the first direction with respect to the virtual straight line (S) linearly connecting the pair of the ridge lines. The opening structure of the packaging box according to claim 8.

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