JP6980489B2 - Packaging box - Google Patents

Description

The present invention relates to a packaging box.

Packaging boxes that can easily cut walls are known.

For example, the paper container described in Patent Document 1 has an operation portion provided in the center of the first wall portion in the left-right direction and an inward upward direction from the left-right side portion of the first wall portion toward the operation portion. An auxiliary fold curve that extends in an inclined manner, a first break line that extends from the operation unit toward the outer end of the auxiliary fold curve in the left-right direction, and a first break line from the end of the first break line (outer end of the auxiliary fold curve). It is provided with a second breaking line extending toward the upper end edge of one wall portion. When the paper container is opened, the operation portion is fractured upward, and the first wall portion is fractured laterally along the first breaking line while being valley-folded along the auxiliary folding curve. At this time, according to the principle of the lever with the auxiliary folding curve as the fulcrum, the upward operating force in the operating portion acts laterally outward with respect to the first wall portion. As a result, it is possible to save labor in breaking the first wall portion along the first breaking line. Further, the first wall portion is fractured vertically along the second fracture line following the lateral fracture.

Japanese Patent No. 5960547

However, in the above-mentioned paper container, since the second breaking line extends upward from the outer end of the auxiliary folding curve, the force for valley folding the first wall portion along the auxiliary folding curve is along the second breaking line. It did not act in the vertical direction. That is, the principle of the lever with the auxiliary folding curve as the fulcrum did not contribute to the fracture of the first wall portion along the second fracture line. Therefore, since the force for breaking the first wall portion along the second breaking line depends on the force of the user who pulls up the operating portion, when a large force is required for breaking the first wall portion along the second breaking line. was there. That is, there is a problem that the above-mentioned paper container cannot be easily opened with a small force.

The present invention provides a packaging box that can be easily opened with a small force in order to solve the above problems.

In order to achieve the above object, the packaging box of the present invention is provided with a peripheral wall having an opening on one surface, a lid wall extending from the end of the peripheral wall, and a lid wall for closing the opening, and the lid wall. A connection wall extending from the side end of the wall and connected to the peripheral wall, and the lid wall, or the connection wall, or the lid wall formed on the boundary line between the lid wall and the connection wall. Of the lid wall corresponding to a cutting line for cutting the lid wall or the connecting wall from the tip end side to the base end side in the extending direction and an intermediate portion excluding the vicinity of the upstream side and the downstream side in the cutting direction of the cutting line. It is formed in a state of extending diagonally from the side portion toward the base end side in the extending direction of the lid wall in a direction away from the cutting line, and pulls the extending direction tip portion of the lid wall to open the opening. It is provided with an auxiliary folding curve that causes the lid wall to be folded in a valley in the process.

Further, in order to achieve the above-mentioned object, the packaging box of the present invention is provided with a peripheral wall having an opening on one surface, a lid wall extending from the end of the peripheral wall and closing the opening, and the above-mentioned. Corresponds to a cutting line formed on the lid wall that cuts the lid wall from the distal end side to the base end side in the extending direction of the lid wall, and an intermediate portion excluding the vicinity of the upstream and the downstream of the cutting line of the cutting line. It is formed in a state of extending diagonally from the side portion of the lid wall toward the base end side in the extension direction of the lid wall in a direction away from the cutting line, and pulls the tip portion of the lid wall in the extension direction. It is provided with an auxiliary folding curve that bends the lid wall in a valley in the process of opening the opening.

In this case, the intersection of the cutting line and the auxiliary folding curve or the virtual extension line extending from the auxiliary folding curve to the cutting line is 1/4 of the total length of the cutting line from the upstream end of the cutting line in the cutting direction. It is preferably set between a distant position and the center of the entire length of the cutting line.

In this case, the lid wall is formed at a position sandwiching the auxiliary folding curve with the cutting line, and the lid wall is piled up in the process of pulling the extending end portion of the lid wall to open the opening. It is preferable to have a second auxiliary folding curve to be folded.

In this case, it is preferable that the peripheral wall is formed in a state of extending along the boundary line between the peripheral wall and the lid wall, and is provided with a second cutting line for cutting the lid wall from the peripheral wall.

in this case,
It is preferable to have a third cutting line which is connected to the cutting line and is formed in a state of extending to the peripheral wall and cuts a part of the peripheral wall.

According to the present invention, the packaging box can be easily opened with a small force.

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 a part of the blank of the packaging box which concerns on one Embodiment of this invention. It is a perspective view explaining the opening operation of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the middle of opening of the packaging box which concerns on one Embodiment of this invention. It is a perspective view which shows the state which each lid wall of the packaging box which concerns on one Embodiment of this invention is removed. It is a perspective view which shows the packaging box which concerns on the 1st modification of one Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on 1st modification of 1 Embodiment of this invention. It is a perspective view which shows the state which opened the packaging box which concerns on 1st modification of 1 Embodiment of this invention. It is a perspective view which shows the packaging box which concerns on the 2nd modification of one Embodiment of this invention. It is a top view which shows the blank of the packaging box which concerns on the 2nd modification of one Embodiment of this invention. It is a perspective view which shows the state which opened the packaging box which concerns on the 2nd modification of 1 Embodiment of this invention. It is a perspective view which shows the packaging box which concerns on the 3rd modification of one 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 "U". "Upper" indicates "upper" and "D" indicates "lower". In addition, 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.

[Overview of packaging box]
The packaging box 1 according to the present embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing a packaging box 1. FIG. 2 is a plan view showing the blank 5 of the packaging box 1. FIG. 3 is a plan view showing a part of the blank 5.

As shown in FIG. 1, the packaging box 1 is formed in a substantially rectangular parallelepiped shape that is long in the vertical direction. The packaging box 1 is provided in a state of standing on the peripheral edge of the bottom wall 10 and having an opening 1A on the upper surface thereof, and extending from the upper end of the peripheral wall 1W, and closing the opening 1A. It is a box containing the lid walls 12A and 12B. The contents (not shown) are accommodated inside the packaging box 1.

The packaging box 1 is formed by assembling the blank 5 shown in FIG. The blank 5 is formed by punching, for example, a sheet of paper corrugated cardboard with a die cutter or the like. The corrugated cardboard sheet is, for example, a double-sided corrugated cardboard sheet in which a front liner 9B and a back liner 9C are bonded to the front and back of a corrugated cardboard 9A. Note that FIG. 2 shows the front liner 9B side (outside of the packaging box 1). In the present specification, the direction parallel to the corrugated cardboard sheet 9A is referred to as "step direction", and the direction orthogonal to the step direction is referred to as "flow direction". “X” shown in the drawing indicates “step direction”, and “Y” indicates “flow direction”.

[blank]
As shown in FIG. 2, the blank 5 includes a bottom wall 10, a first side wall 11A, a second side wall 11B, a first lid wall 12A, a second lid wall 12B, and a pair of outer bottom flaps 13. It includes a pair of first inner flaps 14A, a pair of second inner flaps 14B, a pair of first connecting flaps 15A (connecting walls), and a pair of second connecting flaps 15B (connecting walls).

The first lid wall 12A, the first side wall 11A, the bottom wall 10, the second side wall 11B, and the second lid wall 12B are arranged in a row from one side to the other in this order. The bottom wall 10, the first and second side walls 11A, 11B and the first and second lid walls 12A, 12B are each formed in a substantially rectangular shape long in the flow direction, and their dimensions in the flow direction are substantially the same. It is set.

<1st side wall, 2nd side wall>
The first side wall 11A is continuously provided at one end in the step direction of the bottom wall 10 via the first folding curve L1 extending in the flow direction. The second side wall 11B is continuously provided at the other end of the bottom wall 10 in the step direction via the first folding curve L1. The first side wall 11A and the second side wall 11B are formed in a substantially rectangular shape having substantially the same size. The dimensions of the first and second side walls 11A and 11B in the step direction are set longer (larger) than the dimensions of the bottom wall 10 in the step direction. The first folding curve L1 is a general-purpose ruled line formed by crushing a corrugated cardboard sheet linearly in the thickness direction from the back liner 9C side.

<1st lid wall, 2nd lid wall>
The first lid wall 12A is continuously provided at one end in the step direction of the first side wall 11A via a second cutting line 17 extending in the flow direction. The second lid wall 12B is continuously provided at the other end of the first side wall 11A in the step direction via the second cutting line 17. The first lid wall 12A and the second lid wall 12B are formed in a substantially rectangular shape having substantially the same size. The dimension (extended dimension) in the step direction of the first and second lid walls 12A and 12B is set to be substantially half of the dimension in the step direction of the bottom wall 10.

<Second cutting line>
The second cutting line 17 is formed so as to extend along the boundary line between the first and second side walls 11A and 11B (peripheral wall 1W) and the first and second lid walls 12A and 12B. The second cutting line 17 is a sewing machine blade line in which a plurality of linear cuts are arranged at predetermined intervals. The cut is formed by cutting the corrugated cardboard sheet in the thickness direction. The second cutting line 17 has a function of cutting (separating) the first and second lid walls 12A and 12B from the first and second side walls 11A and 11B (peripheral wall 1W).

<Outside flap>
The pair of outer bottom flaps 13 are connected to both ends of the bottom wall 10 in the flow direction via a second folding curve L2 extending in the step direction. The outer bottom flap 13 is formed in a substantially rectangular shape that is long in the step direction. The stepwise dimension of the bottom outer flap 13 is substantially the same as the stepwise dimension of the bottom wall 10, and the flow direction dimension (extended dimension) of the bottom outer flap 13 is approximately half of the stepwise dimension of the bottom wall 10. Is set to. The second folding curve L2 is a general-purpose ruled line.

<1st inner flap, 2nd inner flap>
The pair of first inner flaps 14A are connected to both ends of the first side wall 11A in the flow direction via the second folding curve L2. The pair of second inner flaps 14B are connected to both ends of the second side wall 11B in the flow direction via the second folding curve L2. The first and second inner flaps 14A and 14B are formed in a substantially rectangular shape long in the step direction. The stepwise dimensions of the inner flaps 14A and 14B are substantially the same as the stepwise dimensions of the side walls 11A and 11B, and the flow direction dimensions (extended dimensions) of the inner flaps 14A and 14B are the bottom outer flaps 13. It is set to be substantially the same as the extension dimension.

<1st connection flap, 2nd connection flap>
The pair of first connecting flaps 15A are connected to both ends of the first lid wall 12A in the flow direction via the first cutting line 16. The pair of second connecting flaps 15B are connected to both ends of the second lid wall 12B in the flow direction via the first cutting line 16. The first and second connecting flaps 15A and 15B are formed in a substantially square shape. The dimensions of the connecting flaps 15A and 15B in the step direction are substantially the same as the extending dimensions of the lid walls 12A and 12B, and the dimensions (extending dimensions) of the connecting flaps 15A and 15B in the flow direction are the bottom outer flaps 13 and the like. It is set to be substantially the same as the extension dimension of.

<First cutting line>
The first cutting line 16 as an example of the cutting line is formed on the boundary line between the first and second lid walls 12A and 12B and the first and second connecting flaps 15A and 15B. The first cutting line 16 is a zipper in which a plurality of substantially L-shaped cuts are arranged at predetermined intervals. The first cutting line 16 extends the lid walls 12A, 12B (or the connecting flaps 15A, 15B) from the outside in the step direction to the inside (from the tip end side to the base end side in the extension direction of the lid walls 12A, 12B). It has a function to disconnect.

<First auxiliary folding curve, second auxiliary folding curve>
A pair of first auxiliary folding curves 18 and a pair of second auxiliary folding curves 19 are formed on the first lid wall 12A and the second lid wall 12B, respectively. The auxiliary folding curves 18 and 19 formed on the first lid wall 12A and the auxiliary folding curves 18 and 19 formed on the second lid wall 12B are lines in the step direction with the bottom wall 10 interposed therebetween. Since the shapes are symmetrical, the auxiliary folding curves 18 and 19 formed mainly on the second lid wall 12B will be described below.

The pair of first auxiliary folding curves 18 are formed between (inside) the pair of first cutting lines 16 on both sides of the second lid wall 12B in the flow direction. The pair of first auxiliary folding curves 18 extend diagonally inward from both sides of the second lid wall 12B corresponding to the middle portion of the entire length of the first cutting line 16 toward the second cutting line 17 side. There is. The pair of second auxiliary folding curves 19 is between (inside) the pair of first auxiliary folding curves 18 and is formed on both sides of the second lid wall 12B in the flow direction. The pair of second auxiliary folding curves 19 extend diagonally outward from the tip of the second lid wall 12B toward the second cutting line 17 side. The first auxiliary folding curve 18 is a reverse ruled line formed by crushing a corrugated cardboard sheet linearly in the thickness direction from the front liner 9B side. The second auxiliary folding curve 19 is a general-purpose ruled line. Further, the pair of first auxiliary folding curves 18 and the pair of second auxiliary folding curves 19 are line symmetric when the second lid wall 12B is inverted at the center line bisected in the flow direction (left-right direction). Since the shape is the same, one first and second auxiliary folding curves 18 and 19 will be described below.

As shown in FIG. 3, the first auxiliary folding curve 18 excludes the vicinity of the upstream side and the vicinity of the downstream side of the first cutting line 16 in the cutting direction (excluding the vicinity of the tip end and the vicinity of the base end of the second lid wall 12B). It extends diagonally from the side portion of the second lid wall 12B corresponding to the intermediate portion toward the extension direction proximal end side (second side wall 11B side) of the second lid wall 12B in a direction away from the first cutting line 16. It is formed in a state. One end of the first auxiliary folding curve 18 in the step direction is separated from the second cutting line 17, and the other end of the first auxiliary folding curve 18 in the step direction is separated from the first cutting line 16. That is, the first auxiliary folding curve 18 is formed at a position near the base end corner portion of the second lid wall 12B so as not to contact or intersect the second cutting line 17 and the first cutting line 16. Further, the intersection P of the first cutting line 16 and the virtual extension line E1 extending from the first auxiliary folding curve 18 to the first cutting line 16 is the upstream end (extended) of the first cutting line 16 in the cutting direction. It is set at a position about 1/3 of the total length away from the tip in the exit direction. The angle α formed by the first auxiliary folding curve 18 and the first cutting line 16 (the portion extending in the step direction) is set to about 25 degrees.

The second auxiliary folding curve 19 is formed on the second lid wall 12B at a position where the first auxiliary folding curve 18 is sandwiched between the first auxiliary folding curve 16 and the first cutting line 16. The second auxiliary folding curve 19 extends diagonally from the extending direction tip of the second lid wall 12B toward the proximal end side (second cutting line 17 side) toward the first cutting line 16. Is formed in. One end of the second auxiliary folding curve 19 in the step direction is separated from the second cutting line 17. That is, the second auxiliary folding curve 19 is formed at a position where it does not contact or intersect the second cutting line 17. Further, the virtual extension line E2 extending from the second auxiliary folding curve 19 to the second cutting line 17 substantially intersects with the virtual extension line E1'extended from the first auxiliary folding curve 18 to the second cutting line 17. The formation position and angle of the second auxiliary folding curve 19 are set so as to be (close). The angle β formed by the second auxiliary folding curve 19 and the first cutting line 16 (parallel to) is set to about 28 degrees.

[Sealing the packaging box]
Next, the sealing process (assembly process) of the packaging box 1 will be described with reference to FIGS. 1 and 2. The packaging box 1 may be manually assembled by an operator, or may be automatically or semi-automatically assembled by a box making machine. Here, as an example, a case where an operator assembles the packaging box 1 will be described.

The packaging box 1 is assembled by appropriately bending a blank 5 (see FIG. 2) with the back liner 9C facing upward. First, the operator bends the first and second side walls 11A and 11B at substantially right angles along the first folding curve L1 to put the side walls 11A and 11B in an upright posture. Subsequently, the operator bends the first and second inner flaps 14A and 14B at substantially right angles along the second folding curve L2, and abuts the tips of the first inner flap 14A and the second inner flap 14B. Put it in a state of being. Next, the operator attaches an adhesive (not shown) to the back liner 9C of the bottom outer flap 13 (or the lower part of each inner flap 14A, 14B (front liner 9B)), and attaches the bottom outer flap 13 to the second. Bend at a substantially right angle along the folding curve L2. Then, the outer bottom flap 13 is fixed to the inner flaps 14A and 14B via the adhesive (see FIG. 1). As the adhesive, for example, a hot melt adhesive, a synthetic resin emulsion adhesive, a double-sided tape, or the like can be used.

As a result, the peripheral wall 1W is provided on the peripheral edge of the bottom wall 10 in an upright posture (see FIG. 1). The peripheral wall 1W is formed in a substantially square cylinder shape having an opening 1A on the upper surface. The operator accommodates the contents from the opening 1A to the inside of the peripheral wall 1W (placed on the bottom wall 10).

Next, the operator attaches an adhesive (not shown) to the back liners 9C of the first and second connecting flaps 15A and 15B (or the upper part of each of the inner flaps 14A and 14B (front liner 9B)). Subsequently, the operator bends the first and second lid walls 12A and 12B at substantially right angles along the second cutting line 17, and then bends the first and second connecting flaps 15A and 15B to the first cutting line. Bend at a substantially right angle along 16. Then, the tip portions of the first lid wall 12A and the second lid wall 12B are butted against each other, and the opening 1A is closed by the lid walls 12A and 12B (see FIG. 1). The first connection flap 15A and the second connection flap 15B are provided so as to extend downward from the side ends of the lid walls 12A and 12B, and are fixed to the inner flaps 14A and 14B via an adhesive ( Connected to the peripheral wall 1W).

As a result, the packaging box 1 is in a sealed state (see FIG. 1).

[Opening the packaging box]
Next, the opening operation of the packaging box 1 will be described with reference to FIGS. 1, 4 to 6. FIG. 4 is a perspective view illustrating the opening operation of the packaging box 1. FIG. 5 is a perspective view showing the middle of opening the packaging box 1. FIG. 6 is a perspective view showing a state in which the lid walls 12A and 12B of the packaging box 1 are removed.

The packaging box 1 is opened by cutting the first and second lid walls 12A and 12B along the first cutting line 16. For example, as shown in FIG. 4, the user inserts a finger into the lower surface of the tip of the second lid wall 12B through the gap between the first lid wall 12A and the second lid wall 12B, and the user inserts a finger into the lower surface of the tip of the second lid wall 12B in the left-right direction of the second lid wall 12B. Pull upward near the center (see the white arrow in Fig. 4). Then, the second lid wall 12B is valley-folded along the first auxiliary folding curve 18 and mountain-folded along the second auxiliary folding curve 19.

Here, when the tip end portion (force point) of the second lid wall 12B is pulled, the first auxiliary folding curve 18 becomes a fulcrum and the second lid wall 12B is valley-folded, and the first auxiliary folding curve 18 (fulcrum) is used. ), A force larger than the force applied to the force point acts on the upstream side (tip portion (action point)) of the first cutting line 16 in the cutting direction (see the thick arrow in FIG. 4). That is, the force for pulling the tip of the second lid wall 12B is amplified by the principle of leverage with the first auxiliary folding curve 18 as the fulcrum, and the tip of the first cutting line 16 (the tip side from the intersection P). Acts on. Thereby, the tip end portion of the second lid wall 12B can be easily cut along the first cutting line 16.

As shown in FIG. 5, when the second lid wall 12B is completely separated from the second connecting flap 15B, the rear half of the opening 1A is opened. Further, the user cuts the first lid wall 12A along the first cutting line 16 and separates the first lid wall 12A from the first connecting flap 15A in the same procedure as the procedure for opening the second lid wall 12B (not shown). As a result, the first and second lid walls 12A and 12B are opened (opening 1A is opened), and the packaging box 1 is opened. In this state, the user can take out the contents from the inside of the packaging box 1.

As shown in FIG. 6, the user may cut the lid walls 12A and 12B along the second cutting line 17 and separate them from the side walls 11A and 11B (peripheral wall 1W). By separating the lid walls 12A and 12B from the peripheral wall 1W in this way, the contents can be easily taken out from the inside of the packaging box 1 without the lid walls 12A and 12B opened to the outside getting in the way. can.

In the packaging box 1 according to the present embodiment described above, the pair of first auxiliary folding curves 18 are formed on the lid walls 12A and 12B from the vicinity of the middle of the total length of the first cutting line 16 toward the downstream in the cutting direction. It extended diagonally inward. According to this configuration, the force pulling the tip of each of the lid walls 12A and 12B can be amplified and acted on the first cutting line 16 by the principle of leverage with the first auxiliary folding curve 18 as a fulcrum. .. As a result, the first and second lid walls 12A and 12B can be cut with a smaller force along the first cutting line 16 as compared with the case where the first auxiliary folding curve 18 is not formed. As a result, the packaging box 1 can be easily opened.

Further, in the packaging box 1 according to the present embodiment, the intersection P of the first cutting line 16 and the virtual extension line E1 of the first auxiliary folding curve 18 is the upstream end of the first cutting line 16 in the cutting direction (each). It was set at a position about 1/3 of the total length (see FIG. 3) from the tip of the lid walls 12A and 12B). According to this configuration, good results can be obtained in a sensory test or the like for evaluating the ease of cutting of each of the lid walls 12A and 12B.

Further, in the packaging box 1 according to the present embodiment, in the process of pulling the extending direction tip portions of the first and second lid walls 12A and 12B to open the opening 1A, the first auxiliary folding curve 18 is a lid. The walls 12A and 12B are folded in a valley, and the second auxiliary folding curve 19 is configured to fold the lid walls 12A and 12B in a mountain fold. According to this configuration, the lid walls 12A and 12B can be easily opened by bending the lid walls 12A and 12B. As a result, the force applied to the cutting of the lid walls 12A and 12B along the first cutting line 16 can be further reduced.

In the packaging box 1 according to the present embodiment, the first cutting line 16 is formed on the boundary line between the first lid wall 12A and the first connecting flap 15A, but the present invention is not limited thereto. For example, the first cutting line 16 may be formed at the first and second lid walls 12A, 12B (positions away from the boundary line) (not shown). Further, for example, the first cutting line 16 is formed at the first and second connecting flaps 15A and 15B (positions away from the boundary line) (not shown), and the second lid walls 12A and 12B are extended. It may have a function of cutting the connecting flaps 15A and 15B from the tip end side to the base end side.

Further, in the packaging box 1 according to the present embodiment, the first cutting line 16 is a zipper, but the present invention is not limited to this, and any line for cutting a corrugated cardboard sheet such as a sewing machine blade line can be used. But it may be. Similarly, the second cutting line 17 is not limited to the sewing machine blade line, and may be any line as long as it is a line for cutting a corrugated cardboard sheet such as a zipper.

Further, in the packaging box 1 according to the present embodiment, the first auxiliary folding curve 18 and the second auxiliary folding curve 19 are formed on the first and second lid walls 12A and 12B. Not limited to. The first and second auxiliary folding curves 18 and 19 may be formed on at least one of the first lid wall 12A and the second lid wall 12B.

Further, in the packaging box 1 according to the present embodiment, the first auxiliary folding curve 18 is formed at a position where it does not contact or intersect the first cutting line 16 and the second cutting line 17, but the present invention has the present invention. Not limited to this. For example, the first auxiliary folding curve 18 may be formed so as to contact or intersect at least one of the second cutting line 17 and the first cutting line 16 (not shown).

Further, in the packaging box 1 according to the present embodiment, the intersection P of the first cutting line 16 and the virtual extension line E1 of the first auxiliary folding curve 18 is the total length from the upstream end of the first cutting line 16 in the cutting direction. Although it was set at a position about 1/3 away, the present invention is not limited to this. As shown by the two-point chain line in FIG. 3, the intersection P between the first cutting line 16 and the virtual extension line E1 of the first auxiliary folding curve 18 is the first from the upstream end in the cutting direction of the first cutting line 16. It may be set between the position separated by 1/4 of the total length of the cutting line 16 and the center (1/2) of the total length of the first cutting line 16. By arranging the intersection P of the first cutting line 16 and the virtual extension line E1 of the first auxiliary folding curve 18 in this range, each lid wall 12A, along the first cutting line 16 in a sensory test or the like, It is possible to obtain an evaluation that 12B can be cut with a light force.

Further, in the packaging box 1 according to the present embodiment, the first auxiliary folding curve 18 is formed at an angle of about 25 degrees with respect to the first cutting line 16, but the present invention is not limited to this. For example, the angle formed by the first auxiliary folding curve 18 and the first cutting line 16 may be set in the range of 5 degrees or more and 100 degrees or less.

Further, in the packaging box 1 according to the present embodiment, the second auxiliary folding curve 19 extends diagonally, and the virtual extension line E2 of the second auxiliary folding curve 19 is the virtual extension line E1'of the first auxiliary folding curve 18. However, the present invention is not limited to this. The inclination angle of the second auxiliary folding curve 19 may be set so that the virtual extension line E2 and the virtual extension line E1'are separated from each other (not shown).

[First modification]
Next, the packaging box 2 according to the first modification of the present embodiment will be described with reference to FIGS. 7 to 9. FIG. 7 is a perspective view showing the packaging box 2. FIG. 8 is a plan view showing the blank 6 of the packaging box 2. FIG. 9 is a perspective view showing a state in which the packaging box 2 is opened. In the description of the other modifications described below, the same reference numerals are given to the configurations similar to or corresponding to the packaging box 1 according to the above embodiment, and the same or corresponding description as the packaging box 1 is omitted.

As shown in FIG. 7, the packaging box 2 is formed in a substantially rectangular parallelepiped shape that is long in the left-right direction and short. The packaging box 2 is a wraparound case that is sealed by closing the left and right end faces (openings 2A) of the peripheral wall 2W that is packaged so as to enclose the contents (not shown). The packaging box 2 is formed by assembling the blank 6 shown in FIG.

[blank]
As shown in FIG. 8, the blank 6 includes a bottom wall 20, a top wall 21, a first side wall 22A, a second side wall 22B, a joint piece 23, a pair of first outer flaps 24A, and a pair. It includes a second outer flap 24B, a pair of first inner flaps 25A, and a pair of second inner flaps 25B.

The second side wall 22B, the top wall 21, the first side wall 22A, the bottom wall 20, and the joint piece 23 are arranged in a row from one side to the other in this order. Each of these walls 20 to 23 is formed in a substantially rectangular shape long in the flow direction, and the dimensions in the flow direction are set to be substantially the same.

<Bottom wall, top wall, first and second side walls, joint pieces>
The bottom wall 20 and the top wall 21 are formed in a substantially rectangular shape having substantially the same size. The first side wall 22A is continuously provided at one end in the step direction of the bottom wall 20 via a first folding curve (general-purpose ruled line). Further, the first side wall 22A is connected to the other end of the top wall 21 in the step direction via two third cutting lines 26 arranged in a row in the flow direction. The second side wall 22B is continuously provided at one end in the step direction of the top wall 21 via two third cutting lines 26. The first side wall 22A and the second side wall 22B are formed in a substantially rectangular shape having substantially the same size. The dimensions of the first and second side walls 22A and 22B in the step direction are set shorter (smaller) than the dimensions of the bottom wall 20 and the like in the step direction. The joint piece 23 is continuously provided at the other end of the bottom wall 20 in the step direction via the first folding curve. The dimension of the joint piece 23 in the step direction is set shorter than the dimension of the first side wall 22A or the like in the step direction.

<Third cutting line>
The third cutting line 26 is formed by arranging two lines in a row in the flow direction along the boundary line between the top wall 21 and each of the side walls 22A and 22B. The two third cutting lines 26 on each boundary line are zippers formed line-symmetrically with the center line bisected in the flow direction of the top wall 21. The two third cutting lines 26 formed in two sets in the step direction have a function of cutting the top wall 21 (a part of the peripheral wall 2W) from both ends (left and right ends) in the flow direction toward the center. ..

<1st outer flap, 2nd outer flap>
The pair of first outer flaps 24A are connected to both ends of the bottom wall 20 in the flow direction via the second folding curve L2. A pair of second outer flaps 24B as an example of the lid wall are connected to both ends of the top wall 21 in the flow direction via the second folding curve L2. The first and second outer flaps 24A and 24B are formed in a substantially rectangular shape that is long in the step direction (the dimension is substantially the same as the dimension in the step direction of the bottom wall 20). The dimensions (extended dimensions) of the outer flaps 24A and 24B in the flow direction are set to approximately half of the dimensions in the step direction of the first side wall 22A.

<1st inner flap, 2nd inner flap>
The pair of first inner flaps 25A are connected to both ends of the first side wall 22A in the flow direction via the second folding curve L2. The pair of second inner flaps 25B are connected to both ends of the second side wall 22B in the flow direction via the second folding curve L2. The first and second inner flaps 25A and 25B are formed in a substantially rectangular shape that is long in the step direction (the dimension is substantially the same as the dimension in the step direction of the first side wall 22A). The dimensions (extended dimensions) of the inner flaps 25A and 25B in the flow direction are set to be substantially the same as the extended dimensions of the outer flaps 24A and 24B.

<First cutting line, first and second auxiliary folding curves>
A pair of first cutting lines 16, a pair of first auxiliary folding curves 18 and a pair of second auxiliary folding curves 19 are formed on the pair of second outer flaps 24B, respectively. Since the first cutting line 16 and the auxiliary folding curves 18 and 19 formed on the pair of second outer flaps 24B have shapes that are line-symmetrical in the flow direction with the top wall 21 sandwiched between them, they are described below. The first cutting line 16 formed on one of the second outer flaps 24B and the auxiliary folding curves 18 and 19 will be described.

The pair of first cutting lines 16 are formed in a state of being obliquely extended so as to connect the tip of the second outer flap 24B in the extending direction and the end of the third cutting line 26. That is, the third cutting line 26 is formed so as to extend from the first cutting line 16 along the boundary line between the top wall 21 and the side walls 22A and 22B (peripheral wall 2W). The distance between the tips of the pair of first cutting lines 16 is set to be substantially the same as the dimension of the first inner flap 25A in the step direction.

The pair of first auxiliary folding curves 18 is located inside the pair of first cutting lines 16 from both sides to the proximal end side of the second outer flap 24B corresponding to approximately the center of the entire length of the first cutting line 16. It is formed so as to extend diagonally inward toward (top wall 21 side). The pair of second auxiliary folding curves 19 are oblique to each other from the tip of the second outer flap 24B toward the base end side (top wall 21 side) on the inner side of the pair of first auxiliary folding curves 18 in the step direction. It is formed in a state of extending outward.

[Sealing the packaging box]
Next, the sealing step (assembly step) of the packaging box 2 will be described with reference to FIGS. 7 and 8. The packaging box 2 may be manually assembled by an operator, or may be fully or semi-automatically assembled by a packaging device (wraparound caser). Here, as an example, a case where the packaging device (not shown) assembles the packaging box 2 fully automatically will be described.

The packaging device bends the first side wall 22A with respect to the bottom wall 20 at a substantially right angle along the first folding curve L1, and places a plurality of accumulated contents on the bottom wall 20. Subsequently, the packaging device bends the seam piece 23 at a substantially right angle along the first folding curve L1 and attaches an adhesive to the outer surface thereof (front liner 9B). Next, the packaging device bends the top wall 21 at a substantially right angle along the third cutting line 26, and bends the second side wall 22B at a substantially right angle along the first folding curve L1. Then, the second side wall 22B is adhered to the passage piece 23 via the adhesive. In this state, a substantially square cylindrical peripheral wall 2W having openings 2A on both left and right end surfaces is formed (see FIG. 7). Then, the contents placed on the bottom wall 20 are wrapped in the peripheral wall 2W.

Next, the packaging device bends the pair of first inner flaps 25A and the pair of second inner flaps 25B inward along the second folding curve L2, and attaches an adhesive to the surfaces of the inner flaps 25A and 25B. The packaging device bends the pair of first outer flaps 24A and the pair of second outer flaps 24B at substantially right angles along the second folding curve L2 and adheres them to the inner flaps 25A and 25B via an adhesive. The first and second outer flaps 24A and 24B are provided so as to extend from the end portion of the peripheral wall 2W, and abut the tip portions thereof to close the opening portion 2A (see FIG. 7).

As a result, the packaging box 2 is in a sealed state (see FIG. 7). The packaging box 2 is a so-called inner glue type in which the joint piece 23 is adhered to the inside of the second side wall 22B, but the present invention is not limited to this, and the so-called outer glue is adhered to the outside of the second side wall 22B. It may be a type.

[Opening the packaging box]
Next, the opening operation of the packaging box 2 will be described with reference to FIGS. 7 and 9.

The packaging box 2 is opened by cutting a pair of second outer flaps 24B along the first cutting line 16 and the third cutting line 26. For example, the user inserts a finger into the back surface of the tip of the pair of second outer flaps 24B and pulls the pair of second outer flaps 24B near the center in the front-rear direction upward. Then, the second outer flap 24B is cut along the first cutting line 16 while being valley-folded along the first auxiliary folding curve 18 and mountain-folded along the second auxiliary folding curve 19. Since the actions of the auxiliary folding curves 18 and 19 are substantially the same as the actions of the auxiliary folding curves 18 and 19 of the packaging box 1 according to the above embodiment, the description thereof will be omitted.

Further, the user cuts the pair of second outer flaps 24B along the first cutting line 16, and then continuously cuts the top wall 21 from both the left and right sides along the third cutting line 26. Then, as shown in FIG. 9, the top wall 21 is separated from the side walls 22A and 22B, and is surrounded by a pair of first cutting lines 16 and four third cutting lines 26 (packaging box 2). The upper surface) opens. As a result, the packaging box 2 is in an opened state.

According to the packaging box 2 according to the first modification of the present embodiment described above, substantially the same operations and effects as those of the packaging box 1 according to the above embodiment can be obtained.

Further, according to the packaging box 2, the pair of second outer flaps 24B is cut by the first cutting line 16, and the top wall 21 as a part of the peripheral wall 2W is cut by the third cutting line 26. A large opening can be formed from the pair of second outer flaps 24B to the top wall 21. As a result, the user can easily take out the contents in the packaging box 2.

In the packaging box 2 according to the first modification of the present embodiment, the third cutting line 26 is formed on the boundary line between the top wall 21 and the side walls 22A and 22B, but the present invention is limited to this. Not done. For example, the third cutting line 26 may be formed on the top wall 21 or on the side walls 22A and 22B (neither is shown). That is, the third cutting line 26 may be formed at a position where a part of the peripheral wall 2W is cut. Further, the third cutting line 26 is formed so as to cut the top wall 21 from both the left and right sides toward the center, but is not limited to this, and is formed so as to cut the top wall 21 in one direction. May be good. Further, the third cutting line 26 may be omitted.

Further, in the packaging box 2 according to the first modification of the present embodiment, the first auxiliary folding curve 18 and the second auxiliary folding curve 19 are formed on the second outer flap 24B. Not limited to. The first and second auxiliary folding curves 18 and 19 may be formed on at least one of the first outer flap 24A and the second outer flap 24B. Further, the second auxiliary folding curve 19 may be omitted.

Further, in the packaging box 2 according to the first modification of the present embodiment, the first auxiliary folding curve 18 is formed at a position where it does not contact or intersect the second folding curve L2 and the first cutting line 16. , Not limited to this, it may be formed so as to contact or intersect at least one of the second folding curve L2 and the first cutting line 16 (not shown).

[Second modification]
Next, the packaging box 3 according to the second modification of the present embodiment will be described with reference to FIGS. 10 to 12. FIG. 10 is a perspective view showing the packaging box 3. FIG. 11 is a plan view showing the blank 7 of the packaging box 3. FIG. 12 is a perspective view showing a state in which the packaging box 3 is opened.

As shown in FIG. 10, the packaging box 3 is formed in a substantially rectangular parallelepiped shape that is long in the vertical direction. The packaging box 3 is an A-type box that is sealed by closing both the upper and lower sides (opening 3A) of the substantially square tubular peripheral wall 3W. The packaging box 3 is formed by assembling the blank 7 shown in FIG.

[blank]
As shown in FIG. 11, the blank 7 includes a pair of side walls 30, a pair of end walls 31, a joint piece 32, a pair of lower inner flaps 33, a pair of lower outer flaps 34, and a pair of upper inner flaps. It includes a flap 35 and a pair of upper and outer flaps 36.

<Side wall, end wall, joint piece>
The pair of side walls 30 and the pair of end walls 31 are arranged in a row alternately in the flow direction, and are connected to each other via the second folding curve L2. The side wall 30 and the end wall 31 are each formed in a substantially rectangular shape having substantially the same dimensions in the step direction. The end wall 31 is formed to be narrower in the flow direction than the side wall 30. The joint piece 32 is continuously provided at the other end of the side wall 30 in the flow direction via the second folding curve L2.

<Lower inner flap>
The lower inner flap 33 is continuously provided at one end (lower end) in the step direction of the end wall 31 via the first folding curve L1. The lower inner flap 33 is formed in a substantially rectangular shape that is long in the flow direction (the dimension is substantially the same as the dimension of the end wall 31 in the flow direction). The dimension (extended dimension) in the step direction of the lower inner flap 33 is set to be substantially half of the dimension in the flow direction of the end wall 31. The lower outer flap 34 is continuously provided at one end in the step direction of the side wall 30 via the first folding curve L1. The lower outer flap 34 is formed in a substantially rectangular shape that is long in the flow direction (the dimension is substantially the same as the dimension of the side wall 30 in the flow direction). The dimension (extended dimension) of the lower outer flap 34 in the step direction is set to be substantially the same as the extended dimension of the lower inner flap 33.

<Upper flap>
The upper inner flap 35 is continuously provided at the other end portion (upper end portion) of the end wall 31 in the step direction via the first folding curve L1. The upper outer flap 36 as an example of the lid wall is continuously provided at the other end of the side wall 30 in the step direction via the first folding curve L1. The upper inner flap 35 is formed in substantially the same shape as the lower inner flap 33, and the upper outer flap 36 is formed in substantially the same shape as the lower outer flap 34.

<1st and 3rd cutting lines, 1st to 3rd auxiliary folding curves>
A pair of first cutting lines 16, a pair of first auxiliary folding curves 18, and a pair of second auxiliary folding curves 19 are formed on the pair of upper and outer flaps 36, respectively. Further, a third cutting line 37 is formed on each of the pair of side walls 30. Since the first cutting line 16 formed on the pair of upper and outer flaps 36 and the auxiliary folding curves 18 and 19 have substantially the same shape, the first one formed on the upper and outer flaps 36 will be described below. The cutting line 16 and the auxiliary folding curves 18 and 19 will be described. Further, for the same reason as this, the third cutting line 37 formed on one side wall 30 will be described.

The pair of first cutting lines 16 are formed in a state of being extended so as to connect the extending direction tip of the upper outer flap 36 and the side wall 30 in the flow direction intermediate region of the upper outer flap 36.

The pair of first auxiliary folding curves 18 is located inside the pair of first cutting lines 16 from both sides of the upper and outer flaps 36 corresponding to approximately the center of the total length of the first cutting lines 16 to the proximal end side ( It is formed so as to extend diagonally inward toward the side wall (30 side). The pair of second auxiliary fold curves 19 extends diagonally outward from the tip of the upper outer flap 36 toward the proximal end side (side wall 30 side) inside the pair of first auxiliary fold curves 18. Is formed in.

The third cutting line 37 is formed in a substantially quadrangular shape including a pair of vertical cutting lines 37A and a horizontal cutting line 37B. The pair of vertical cutting lines 37A are zippers that extend downward from the upper end of the side wall 30 continuously from the pair of first cutting lines 16. The pair of vertical cutting lines 37A extend below the center of the side wall 30 in the step direction (closer to the lower outer flap 34). The horizontal cutting line 37B is a sewing machine blade line extending so as to connect the lower ends of the pair of vertical cutting lines 37A.

[Sealing the packaging box]
Next, the sealing step (assembly step) of the packaging box 3 will be described with reference to FIGS. 10 and 11. Here, as an example, a case where an operator assembles the packaging box 3 will be described. Further, it is assumed that the side wall 30 and the end wall 31 are bent along the second folding curve L2, and the joint piece 32 is adhered to the inner surface of the opposite end wall 31 with an adhesive. That is, it is assumed that the packaging box 3 is in a folded state.

The operator bends the pair of side walls 30 and the pair of end walls 31 at substantially right angles along the second folding curve L2 to form a substantially square cylindrical peripheral wall 3W. Subsequently, the operator bends the lower inner flap 33 at a substantially right angle along the first folding curve L1 to attach the adhesive to the surface of the lower inner flap 33 (front liner 9B). Next, the operator bends the lower outer flap 34 at a substantially right angle along the first folding curve L1. Then, the pair of lower outer flaps 34 are adhered to the lower inner flap 33 via the adhesive in a state where the tip portions thereof are abutted against each other. In this state, the opening 3A on the lower surface of the peripheral wall 3W is closed, and the bottom surface of the packaging box 1 is formed (see FIG. 10). Then, the operator accommodates the contents from the opening 3A on the upper surface to the inside of the peripheral wall 3W.

Next, the operator bends the upper inner flap 35 at a substantially right angle along the first folding curve L1 to attach the adhesive to the surface of the upper inner flap 35. Next, the operator bends the upper outer flap 36 at a substantially right angle along the first folding curve L1. Then, the pair of upper and outer flaps 36 are adhered to the upper and inner flaps 35 via an adhesive in a state where the tip portions thereof are abutted against each other.

As a result, the opening 3A on the upper surface of the peripheral wall 3W is closed, and the packaging box 3 is in a sealed state (see FIG. 10).

[Opening the packaging box]
Next, the opening operation of the packaging box 3 will be described with reference to FIGS. 10 and 12.

The packaging box 3 is opened by cutting the upper outer flap 36 at the first cutting line 16 and cutting the side wall 30 at the third cutting line 37. For example, the user inserts a finger into the back surface of the tip of one of the upper and outer flaps 36, and pulls upward near the center of the upper and outer flaps 36 in the left-right direction. Then, the upper outer flap 36 is cut along the first cutting line 16 while being valley-folded along the first auxiliary folding curve 18 and mountain-folded along the second auxiliary folding curve 19. Since the actions of the auxiliary folding curves 18 and 19 are substantially the same as the actions of the auxiliary folding curves 18 and 19 of the packaging box 1 according to the above embodiment, the description thereof will be omitted.

Further, the user cuts the upper outer flap 36 along the first cutting line 16 and then subsequently cuts the side wall 30 along the pair of vertical cutting lines 37A. Further, the user cuts the side wall 30 along the pair of vertical cutting lines 37A, and then cuts the side wall 30 along the horizontal cutting line 37B. Then, as shown in FIG. 12, a part of the upper outer flap 36 and a part of the side wall 30 are separated from the packaging box 3, and a large opening can be formed from the upper outer flap 36 to the side wall 30. As a result, the packaging box 3 is in an opened state.

According to the packaging box 3 according to the second modification of the present embodiment described above, substantially the same operation and effect as those of the packaging boxes 1 and 2 according to the above embodiment (including the first modification) can be obtained. Can be done.

In the packaging box 3 according to the second modification of the present embodiment, the third cutting line 37 is formed on the side wall 30, but the present invention is not limited to this. For example, the pair of vertical cutting lines 37A of the third cutting line 37 may be formed on the boundary line between the side wall 30 and the end wall 31, respectively, or may be formed on the end wall 31 (both are shown in the figure). Not shown). In this case, it is preferable to additionally form a cutting line (not shown) for cutting between the first cutting line 16 and the vertical cutting line 37A. Further, for example, the pair of vertical cutting lines 37A may extend to the boundary line between the side wall 30 and the lower outer flap 34 (not shown). In this case, it is preferable to form the horizontal cutting line 37B on the boundary line between the side wall 30 and the lower outer flap 34. As described above, the third cutting line 37 may be formed at a position where a part of the peripheral wall 2W is cut. Further, the third cutting line 37 may be omitted.

Further, in the packaging box 3 according to the second modification of the present embodiment, the first auxiliary folding curve 18 and the second auxiliary folding curve 19 are formed on the pair of upper and outer flaps 36, but the present invention has the present invention. Not limited to this. The first and second auxiliary folding curves 18 and 19 may be formed on at least one of the pair of upper and outer flaps 36.

Further, in the packaging box 3 according to the second modification of the present embodiment, the first auxiliary folding curve 18 is formed at a position where it does not contact or intersect the first folding curve L1 and the first cutting line 16. , Not limited to this, it may be formed so as to contact or intersect at least one of the first folding curve L1 and the first cutting line 16 (not shown).

[Third modification example]
The packaging box 3 according to the second modification in the present embodiment is formed in a substantially rectangular parallelepiped shape, but the present invention is not limited to this. For example, as shown in FIG. 13, the packaging box 4 according to the third modification may include a chamfered wall 38 between the side wall 30 and the end wall 31 to form a substantially octagonal columnar peripheral wall 4W. In this case, after the pair of upper outer flaps 36 closes the opening 4A of the peripheral wall 4W, the pair of upper inner flaps 35 may be adhered to the outer surface of the pair of upper outer flaps 36. Although the second cutting line 17 and the third cutting line 37 are omitted in the packaging box 4, these cutting lines 17 and 37 may be formed.

In the packaging boxes 2 to 4 according to the first to third modifications of the present embodiment, the first cutting line 16 extends diagonally, but the first cutting line 16 is not limited to this, and the first cutting line 16 has a lid. The second outer flap 24B and the upper outer flap 36 as an example of the wall may extend in a direction orthogonal to the extending direction tip side (not shown).

Further, in the packaging boxes 2 to 4 according to the first to third modifications of the present embodiment, the second outer flap 24B and the upper outer flap 36 as an example of the lid wall are separated from the peripheral walls 2W, 3W, and 4W. Although the second cutting line 17 was not formed, a second cutting line 17 may be formed in place of / in addition to the third cutting lines 26 and 37. Further, in the packaging box 1 according to the above embodiment, in place of / in addition to the second cutting line 17, the third cutting line 26 for cutting a part of the peripheral wall 1W (each side wall 11A, 11B), 37 may be formed.

Further, in the packaging boxes 2 to 4 according to the first to third modifications of the present embodiment, the first cutting line 16, the third cutting line 26, and the vertical cutting line 37A are zippers, but the present invention is limited to this. However, any line for cutting a corrugated cardboard sheet such as a sewing machine blade line may be used. Similarly, the horizontal cutting line 37B of the packaging box 3 according to the second modification is not limited to the sewing machine blade line, and may be any line as long as it is a line for cutting a corrugated cardboard sheet such as a zipper.

In the packaging boxes 1 to 4 according to the present embodiment (including each modification, the same applies hereinafter), the second auxiliary folding curve 19 extends diagonally, but the present invention is not limited to this, and the second auxiliary folding curve 19 is not limited to this. The curve 19 may extend in a direction orthogonal to the extending direction tip side of each lid wall 12A, 12B, the second outer flap 24B, and the upper outer flap 36 as an example of the lid wall (not shown). Further, the packaging boxes 1 to 4 according to the present embodiment have the first auxiliary folding curve 18 and the second auxiliary folding curve 19, but the present invention is not limited to this, and the second auxiliary folding curve 19 is omitted. May be done.

Further, in the packaging boxes 1 to 4 according to the present embodiment, the first auxiliary folding curve 18 is formed by one reverse ruled line, but the present invention is not limited to this, and two auxiliary folding curves 18 arranged in parallel at narrow intervals are not limited to this. It may be composed of reverse ruled lines (not shown). Further, the first auxiliary folding curve 18 is not limited to the reverse ruled line, and may be any line as long as it is a line for valley folding the corrugated cardboard sheet, such as a general-purpose ruled line or a lead ruled line in which general-purpose ruled lines and cuts are alternately arranged. .. Similarly to this, the second auxiliary folding curve 19 is not limited to one general-purpose ruled line, and may be any line as long as it is a line for folding a corrugated cardboard sheet in a mountain fold.

Further, the sizes, shapes (forms), and the like of the packaging boxes 1 to 4 according to the present embodiment are examples, and can be changed according to the shape and size of the contents.

Further, the packaging boxes 1 to 4 according to the present embodiment are formed of a double-sided corrugated cardboard sheet made of paper, but the present invention is not limited thereto. For example, the corrugated cardboard sheet may be a single-sided corrugated cardboard sheet in which a liner is attached to one side of the middle shin 9A, or a double-sided corrugated cardboard sheet in which a single-sided corrugated cardboard sheet is attached to a double-sided corrugated cardboard sheet. Further, for example, the packaging boxes 1 to 4 may be formed of thick paper, a resin plate, or the like instead of the corrugated cardboard sheet made of paper.

It should be noted that the description of the above embodiment shows one aspect of the packaging box according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

1,2,3,4 Packaging box 1A, 2A, 3A, 4A Opening 1W, 2W, 3W, 4W Circumferential wall 12A 1st lid wall (cover wall)
12B 2nd lid wall (cover wall)
15A 1st connection flap (connection wall)
15B 2nd connection flap (connection wall)
16 First cutting line (cutting line)
17 Second cutting line 18 First auxiliary folding curve (auxiliary folding curve)
19 Second auxiliary folding curve 24B Second outer flap (cover wall)
26, 37 Third cutting line 36 Upper outer flap (cover wall)

Claims (5)

A peripheral wall (1W) having an opening (1A) on one side,
A lid wall (12A, 12B) provided so as to extend from the end of the peripheral wall and close the opening, and
Connection walls (15A, 15B) provided in a state of extending from the side end of the lid wall and connected to the peripheral wall, and
The lid wall or the connection wall is formed on the boundary line between the lid wall and the connection wall, and the lid wall or the connection wall is cut from the extending direction tip side to the base end side of the lid wall. Cutting line (16) to make
It extends diagonally from the side portion of the lid wall corresponding to the intermediate portion excluding the vicinity of the upstream side and the vicinity of the downstream side of the cutting line toward the base end side in the extending direction of the lid wall in a direction away from the cutting line. an auxiliary folding line formed to the state (18),
A second second formed on the lid wall at a position sandwiching the auxiliary folding curve with the cutting line, and extending diagonally from the extending direction tip of the lid wall toward the proximal end side in a direction approaching the cutting line. With an auxiliary folding curve (19) ,
The virtual extension line (E2) extended from the second auxiliary fold curve intersects or is close to the virtual extension line (E1') extended from the auxiliary fold curve.
When the extension direction tip of the lid wall is pulled to open the opening, the lid wall is valley-folded along the auxiliary fold curve and mountain-folded along the second auxiliary fold curve. packaging box, characterized in that that (1). Peripheral walls (2W, 3W, 4W) having openings (2A, 3A, 4A) on one side,
A lid wall (24B, 36) provided so as to extend from the end of the peripheral wall and close the opening, and
A cutting line (16) formed on the lid wall and cutting the lid wall from the extending direction tip side to the base end side of the lid wall, and
It extends diagonally from the side portion of the lid wall corresponding to the intermediate portion excluding the vicinity of the upstream side and the vicinity of the downstream side of the cutting line toward the base end side in the extending direction of the lid wall in a direction away from the cutting line. an auxiliary folding line formed to the state (18),
A second second formed on the lid wall at a position sandwiching the auxiliary folding curve with the cutting line, and extending diagonally from the extending direction tip of the lid wall toward the proximal end side in a direction approaching the cutting line. With an auxiliary folding curve (19) ,
The virtual extension line (E2) extended from the second auxiliary fold curve intersects or is close to the virtual extension line (E1') extended from the auxiliary fold curve.
When the extension direction tip of the lid wall is pulled to open the opening, the lid wall is valley-folded along the auxiliary fold curve and mountain-folded along the second auxiliary fold curve. packaging box, characterized in that that (2, 3, 4). The intersection of the cutting line and the auxiliary folding curve or the virtual extension line extending from the auxiliary folding curve to the cutting line is located at a position 1/4 of the total length of the cutting line from the upstream end of the cutting line in the cutting direction. The packaging box according to claim 1 or 2, wherein the packaging box is set between the center and the center of the entire length of the cutting line. 1. The packaging box according to any one of 3. Connected to said cutting line is formed in a state extending in the peripheral wall, of claims 1, characterized in that it comprises a third cutting line for cutting a portion of said peripheral wall (26, 37) 4 The packaging box described in either.

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