JP7438894B2 - packaging box - Google Patents

Description

The present invention relates to packaging boxes.

A packaging box is known in which an insertion piece with a connected lid flap is inserted into a side plate of the box body, and a locking piece provided on the side plate so as to be foldable is inserted into a locking opening of the insertion piece ( Patent Document 1). The locking piece has an insertion portion and a second locking piece that is folded back at the tip thereof. The insertion piece has a receiving piece that can be folded into the box inside the locking opening. The receiving piece receives the second locking piece so that the tip of the second locking piece corresponds to the lower part of the locking opening, making it impossible to pull out and return the locking piece. Unless the portion to be turned over provided on the lid flap is separated by a perforation, the locking piece and the insertion piece cannot be unlocked, thereby preventing unauthorized opening.

Japanese Patent Application Publication No. 2005-8262

However, in the above-mentioned packaging box, it is necessary to fold back the second locking piece to the insertion part and insert the two stacked locking pieces into the locking opening, which makes the work of inserting the locking piece complicated and easy. I couldn't say it. In addition, if the second locking piece is folded back in the wrong direction with respect to the insertion part, the receiving piece will not be able to receive the second locking piece, and the locking piece will be able to be pulled back out, preventing unauthorized opening. It was assumed that there would be cases where it would not be possible to deter the virus.

In order to solve the above-mentioned problems, the present invention provides a packaging box that can restrict the insertion piece from being pulled out.

The present invention provides a packaging box for packaging an object, comprising: a first wall; a second wall disposed opposite the first wall with a space for accommodating the object; an inner wall that is bent relative to the second wall and covered by the inner wall; and an outer wall that is bent relative to the outer wall and cut along the boundary line between the first wall and the inner wall. an insertion piece that is inserted into the insertion opening, the insertion piece has a locking hole formed at a position away from the boundary with the outer wall toward the tip side, and the insertion piece A locking piece is provided on the inner wall so as to straddle the insertion port, and the locking piece is connected via a locking fold line at a position offset from the edge of the insertion port toward the inner wall. It is formed by cutting from both ends of the locking fold line to the first wall, and as the inner wall is bent, it is bent at the locking fold line and takes an inclined position with the tip facing the first wall. The tip of the locking piece that has become . The insertion piece engages with the locking hole due to the repulsive force around the fold line, and the insertion piece is prevented from being pulled out from the insertion opening.

In this case, the tip of the locking piece is connected to the first wall via a cuttable line, and the locking piece is connected to the locking fold line and the cuttable line as the inner wall is bent. The locking piece may be bent into an inclined position, and the tip of the locking piece may be cut along the cuttable line by the insertion piece inserted into the insertion opening and separated from the first wall.

In this case, the amount of deviation of the locking fold line from the edge of the insertion opening may be set in a range of 1 to 2 times the thickness of the insertion piece.

In this case, an opening cutting line for opening may be formed on at least one of the boundary between the second wall and the outer wall, the boundary between the outer wall and the insertion piece, and the outer wall. good.

According to the present invention, it is possible to restrict the insertion piece from being pulled out.

FIG. 1 is a perspective view showing a packaging box according to an embodiment of the present invention. FIG. 2 is a plan view showing a packaging box blank according to an embodiment of the present invention. FIG. 2 is a perspective view showing a packaging box in the middle of being assembled according to an embodiment of the present invention. FIG. 2 is an enlarged perspective view showing the inside of a packaging box according to an embodiment of the present invention, including an insertion port and the like. FIG. 2 is an enlarged perspective view of the outside of the packaging box according to an embodiment of the present invention, showing an insertion port and the like. FIG. 2 is a cross-sectional view showing a state in which an insertion piece of a packaging box according to an embodiment of the present invention is inserted into an insertion opening. FIG. 2 is a sectional view showing a state in which an insertion piece of a packaging box according to an embodiment of the present invention is inserted into an insertion opening. FIG. 2 is a perspective view showing a state in which an insertion piece of a packaging box according to an embodiment of the present invention is inserted into an insertion opening.

Embodiments of the present invention will be described below with reference to the accompanying drawings. Note that Fr, Rr, L, R, U, and D shown in the drawings indicate front, rear, left, right, top, and bottom. The front-back direction, the left-right direction, and the up-down direction are orthogonal to each other. Although terms indicating directions and positions are used in this specification, these terms are used for convenience of explanation and do not limit the technical scope of the present invention. Further, terms indicating direction and position are based on the direction and position of the assembled packaging box.

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

As shown in FIG. 1, the packaging box 1 is, for example, a flat box so that the packaged object M (see FIG. 5A, etc.) can be placed in a mailbox in a packaged state. The packaging box 1 includes a box body 2 with an open top surface, and a lid 3 that covers the top surface of the box body 2. The box body 2 is formed into a tray shape, and the packaged object M is accommodated inside the box body 2. The lid body 3 is rotatably connected to the rear upper end of the box body 2.

The packaging box 1 is formed by assembling blanks 1A shown in FIG. The blank 1A is formed by punching out a single corrugated paper sheet using a cutting die or the like. The corrugated cardboard sheet is, for example, a double-sided corrugated cardboard sheet in which a front liner 9B and a back liner 9C (see FIG. 3) are bonded to a corrugated medium 9A. Note that FIG. 2 shows the front liner 9B side (outer surface of the packaging box 1). In this specification, a direction parallel to the corrugated cardboard sheet 9A will be referred to as a "corrugated direction", and a direction perpendicular to the corrugated direction will be referred to as a "flow direction". "X" shown in the drawings indicates the "stage direction" and "Y" indicates the "flow direction."

[blank]
As shown in FIG. 2, the blank 1A includes a bottom wall 10, a pair of side inner walls 11, a pair of side inner flaps 12, a front wall 13, a front flap 14, a rear wall 15, and a lid wall 16. , a pair of side outer walls 17 and a pair of insertion pieces 18. A bottom wall 10, a side inner wall 11, a side inner flap 12, a front wall 13, a front flap 14, and a rear wall 15 constitute the box body 2. The lid wall 16, the side outer wall 17, and the insertion piece 18 constitute the lid body 3. Note that the pair of side inner walls 11, the pair of side inner flaps 12, the pair of side outer walls 17, and the pair of insertion pieces 18 each have a shape that is symmetrical in FIG. Unless otherwise specified, the explanation will focus on one part.

<Bottom wall, inner side wall, inner side flap>
The bottom wall 10, which is an example of the first wall, is formed in a substantially rectangular shape that is long in the step direction. A pair of side inner walls 11 as an example of inner walls are connected to both ends of the bottom wall 10 in the step direction via the first folding line L1. The pair of inner side flaps 12 are connected to the ends of the pair of inner side walls 11 in the step direction via the second folding line L2. The side inner wall 11 and the side inner flap 12 are each formed in a rectangular shape that is short in the step direction and elongated in the flow direction. A pair of folding pieces 20 are connected to both ends of the side inner wall 11 in the flow direction via a third folding line L3. A side notch 21 is cut out on one side (front side) of the inner flap 12 in the flow direction from the distal end toward the proximal end in the step direction.

(Inlet)
A pair of insertion ports 25 are formed at both ends of the bottom wall 10 in the step direction and in the center region in the flow direction. Each insertion port 25 is a slit cut along the boundary line (first folding line L1) between the bottom wall 10 and the side inner wall 11. Each insertion port 25 is cut into a substantially trapezoidal shape that slightly protrudes toward the side inner wall 11 from the first folding line L1. The amount of protrusion (S1) of the insertion opening 25 from the first folding line L1 is set to be slightly larger (longer) than the thickness of the insertion piece 18 (corrugated cardboard sheet), which will be described later. Note that the first folding line L1 extends from both ends of the insertion port 25 in the flow direction to both outer sides.

(locking piece)
Further, a locking piece 26 is provided on the bottom wall 10 and the side inner wall 11 near the center of the insertion port 25 in the flow direction so as to straddle (cross) the insertion port 25. Each of the locking pieces 26 is connected to the bottom wall 10 from both ends of the locking fold line L7 at a position shifted from the edge of the insertion opening 25 to the side inner wall 11 (above). It is formed by cutting across. Specifically, the locking fold line L7 is located at a position further shifted toward the tip side (upward) in the step direction of the side inner wall 11 from the position of the edge of the insertion port 25 that most protrudes toward the side inner wall 11 side. It is formed substantially parallel to the folding line L1. The amount of deviation (S2) of the locking fold line L7 from the edge of the insertion opening 25 is set to approximately twice the thickness of the insertion piece 18 (corrugated cardboard sheet), which will be described later.

The locking piece 26 is defined into a substantially rectangular shape by a pair of cuts extending substantially parallel to each other so as to bite into the bottom wall 10 from both ends of the locking fold line L7 in the flow direction. Since the locking piece 26 is provided so as to divide the insertion opening 25 into two, the insertion opening 25 and the first folding line L1 are not formed in the locking piece 26. The tip of the locking piece 26 is connected to the bottom wall 10 via a cuttable line 27. The cuttable line 27 is formed substantially parallel to the first folding line L1 (locking folding line L7). The cuttable line 27 is a perforation line in which linear cuts are arranged in parallel at equal intervals in the flow direction, and has the function of separating the locking piece 26 from the bottom wall 10. Moreover, the length of the locking piece 26 from the first folding line L1 to the cuttable line 27 is longer than the length from the first folding line L1 to the locking folding line L7.

<Front wall>
The front wall 13 is connected to one end (front end) of the bottom wall 10 in the flow direction via the third folding line L3. The front wall 13 is formed into a substantially rectangular shape, and the dimension (extension dimension) of the front wall 13 in the flow direction is approximately the same as the dimension of the side inner wall 11 in the step direction.

<Front flap>
The front flap 14 is connected to the tip of the front wall 13 via a fourth folding line L4. The front flap 14 is formed in a substantially rectangular shape, and the dimension (extension dimension) of the front flap 14 in the flow direction is set to be longer (approximately three times) than the extension dimension of the front wall 13. A pair of front notches 22 are cut out in the front flap 14 from both ends in the step direction toward the inside. A pair of auxiliary broken lines L8 are formed in the front flap 14 so as to be inclined toward each other from the vicinity of the deepest part of the pair of front notches 22 toward the tip of the front flap 14 in the flow direction. A pair of front engagement pieces 23 are formed at both corners of the front flap 14 and are defined by a pair of auxiliary fold lines L8.

<Back wall>
The rear wall 15 is connected to the other end (rear end) of the bottom wall 10 in the flow direction via the third folding line L3. The rear wall 15 is formed to have substantially the same shape as the front wall 13.

<Lid wall>
The lid wall 16, which is an example of the second wall, is connected to the tip (upper end) of the rear wall 15 via the fifth folding line L5. The lid wall 16 is formed in a substantially rectangular shape, and the dimension of the lid wall 16 in the flow direction is set shorter than the dimension of the bottom wall 10 in the flow direction.

<Side outer wall>
A pair of side outer walls 17 as an example of outer walls are connected to both ends of the lid wall 16 in the step direction via the opening cutting line 30. The pair of side outer walls 17 are provided at positions closer to the tip side of the lid wall 16 in the flow direction. The side outer wall 17 is formed into a substantially trapezoidal shape (more precisely, a substantially hexagonal shape) whose width becomes narrower in the flow direction as the distance from the lid wall 16 increases. The unsealing cutting line 30 is for unsealing the packaging box 1 and is formed at the boundary between the lid wall 16 and the side outer wall 17. Specifically, the unsealing cutting line 30 is a zipper in which bent cuts are arranged in parallel at equal intervals in the machine direction. The unsealing cutting line 30 has a function of cutting the lid wall 16 from the front to the rear with respect to the pair of side outer walls 17.

<Insert piece>
The insertion piece 18 is connected to the tip of the side outer wall 17 in the step direction via the sixth folding line L6. The insertion piece 18 is formed into a substantially trapezoidal shape (more precisely, a substantially hexagonal shape) smaller than the side outer wall 17. A pair of insertion slits 31 are cut inward from both ends in the flow direction at the boundary between the insertion piece 18 and the side outer wall 17, and a sixth fold line L6 is formed between the pair of insertion slits 31. It is formed. A locking hole 32 is bored in the insertion piece 18 at a position away from the boundary with the side outer wall 17 (sixth folding line L6) toward the tip side. The locking hole 32 opens in a substantially central region of the insertion piece 18 . The locking hole 32 is formed in a substantially rectangular shape, and the size of the locking hole 32 in the flow direction is set to be slightly larger than the size of the locking piece 26 in the flow direction.

Note that the first to sixth folding lines L1 to L6, the locking folding line L7, and the auxiliary folding line L8 are general-purpose ruled lines obtained by crushing the corrugated cardboard sheet in the thickness direction from the back liner 9C side. The general-purpose ruled line has the function of folding (normally folding) the corrugated cardboard sheet so that the back liner 9C faces inward. The first to sixth folding lines L1 to L6, the locking folding line L7, and the auxiliary folding line L8 are not limited to general-purpose ruled lines, but can be any structure for folding a corrugated board sheet, such as lead ruled lines with perforations formed on the general-purpose ruled lines. It can be anything.

[Assembling the packaging box]
Next, the assembly process of the packaging box 1 will be described with reference to FIGS. 1, 3, 4A, 4B, 5A, 5B, and 6. FIG. 3 is a perspective view showing the packaging box 1 in the middle of being assembled. 4A and 4B are perspective views showing the insertion port 25 and the like in an enlarged manner. FIG. 5A is a sectional view showing a state in which the insertion piece 18 is inserted into the insertion port 25. FIG. 5B is a sectional view showing a state in which the insertion piece 18 is inserted into the insertion opening 25. FIG. 6 is a perspective view showing a state in which the insertion piece 18 is inserted into the insertion opening 25. Here, as an example, a case will be described in which a worker assembles the packaging box 1 manually. In addition, in the following description, the explanation will continue to focus on one part, unless it is explicitly stated that there is a pair of parts.

As shown in FIG. 3, the operator turns the back liner 9C of the blank 1A upward and bends the pair of side inner walls 11 upward along the first folding line L1. A pair of side inner walls 11 are bent with respect to the bottom wall 10 and are erected at both left and right ends of the bottom wall 10. When the side inner wall 11 is bent, as shown in FIGS. 4A and 4B, a gap approximately the thickness of the corrugated cardboard sheet (projection amount of the insertion hole 25 (S1 ) is formed. The locking piece 26 is bent along the locking fold line L7 and the cuttable line 27 as the side inner wall 11 is bent, and takes an inclined position with the tip extending from the side inner wall 11 facing the bottom wall 10. The locking piece 26 slopes downward inward from the side inner wall 11 and spans the side inner wall 11 and the bottom wall 10 diagonally.

As shown in FIG. 3, the operator folds the pair of inner side flaps 12 inward along the second folding line L2, and folds the four folding pieces 20 inwardly along the third folding line L3. Next, the operator folds the front wall 13 along the third folding line L3, and folds the front flap 14 rearward along the fourth folding line L4. Additionally, the operator lightly bends the pair of front engaging pieces 23 (see FIG. 2) of the front flap 14 downward along the auxiliary fold line L8 (see FIG. 2), and inserts the side notches of the pair of inner side flaps 12. 21. Then, since the pair of front notches 22 of the front flap 14 engages with the pair of side notches 21, the front flap 14 is fixed to the pair of inner side flaps 12. In this state, the front wall 13 is erected at the front end of the bottom wall 10 and covered with the outer surface of the front folding piece 20. Further, the front flap 14 excluding the front engagement piece 23 is covered over the pair of inner side flaps 12 .

With the above, most of the box body 2 has been constructed. The operator places the object to be packaged M (see FIG. 5A etc.) on the bottom wall 10.

Next, the operator bends the rear wall 15 upward along the third folding line L3. As a result, a tray-shaped box body 2 with an open upper surface is completed. Subsequently, as shown in FIG. 1, the operator bends the lid wall 16 forward along the fifth folding line L5. The lid wall 16 is disposed opposite to the bottom wall 10 with the storage space for the packaged object M interposed therebetween. The tip side (front side) of the lid wall 16 overlaps the rear side of the front flap 14.

Next, while bending the side outer wall 17 downward along the unsealing cutting line 30, the operator bends the insertion piece 18 inward along the sixth folding line L6 to open the insertion opening 25 in the side inner wall 11. (See Figure 5A). When the insertion piece 18 is bent against the side outer wall 17 and inserted into the insertion opening 25, the tip of the insertion piece 18 comes into contact with the lower surface of the locking piece 26 which is in an inclined position. As the insertion of the insertion piece 18 progresses, the tip of the insertion piece 18 is pressed against the connecting portion (cuttable line 27) between the locking piece 26 and the bottom wall 10. Then, as shown in FIG. 5A, the tip of the locking piece 26 in the inclined position is cut along the cuttable line 27 by the insertion piece 18 inserted into the insertion opening 25, and is pulled away from the bottom wall 10 (lifted up). ).

As shown in FIGS. 5B and 6, when the insertion piece 18 is inserted into the insertion opening 25 (the insertion is completed), the tip of the locking piece 26 is exposed to the repulsive force around the locking fold line L7 ( The insertion piece 18 is engaged with the locking hole 32 (falls down) by the restoring force). In addition, in the state where the insertion of the insertion piece 18 is completed, the side outer wall 17 is bent with respect to the lid wall 16, and is covered with the side inner wall 11 (refer FIG. 1 and FIG. 5B).

Through the above steps, the lid 3 is placed over the box body 2, and the assembly of the packaging box 1 is completed. In other words, the packaging box 1 is in a sealed state (see FIG. 1). When an attempt is made to pull out the insertion piece 18 from the sealed packaging box 1, the tip of the locking piece 26 comes into contact with the inner surface of the front end side of the locking hole 32, as shown in FIG. The pulling out of the inserting piece 18 is restricted. Therefore, since the insertion piece 18 cannot be pulled out without being destroyed, it is possible to accurately determine whether or not the packaging box 1 has been tampered with. Note that the lid wall 16 may be fixed to the front flap 14 by pasting an adhesive tape, a delivery slip, or the like across the lid wall 16 and the front flap 14 (not shown).

Although not shown, when an authorized user opens the packaging box 1, the user grasps the tip of the lid wall 16 and pulls up the lid wall 16. The lid wall 16 is cut along a pair of unsealing cutting lines 30 and separated from a pair of side outer walls 17. Then, the top surface of the box body 2 is opened, and the user can take out the packaged item M. By separating the lid wall 16 from the pair of side outer walls 17 in this manner, the packaging box 1 can be easily opened. Note that even after the packaging box 1 is opened, each insertion piece 18 remains inserted into the insertion opening 25, and each side outer wall 17 is connected to the box body 2 via the insertion piece 18. .

In the packaging box 1 according to the present embodiment described above, the locking piece 26 is continuously provided via the locking fold line L7 at a position shifted upward from the edge of the insertion port 25, and extends from the side inner wall 11 to the bottom wall. 10 (see FIG. 4A, etc.). The tip of the inclined locking piece 26 is configured to engage with the locking hole 32 of the insertion piece 18 inserted into the insertion opening 25 by the repulsive force (restoring force) around the locking fold line L7. (See Figure 5B, etc.). According to this configuration, the locking piece 26 can be automatically engaged with the locking hole 32 of the insertion piece 18 simply by the operator inserting the insertion piece 18 into the insertion opening 25 . This makes it possible to easily restrict the insertion piece 18 from being pulled out. Further, the tip of the inclined locking piece 26 is configured to be lifted by the insertion piece 18 inserted into the insertion opening 25. That is, the tip of the insertion piece 18 inserted into the insertion opening 25 was configured to first come into contact with the locking piece 26 (see FIG. 5A, etc.). According to this configuration, when inserting the insertion piece 18 into the insertion port 25, the tip of the insertion piece 18 is less likely to interfere with the object to be packaged M, so damage to the object to be packaged M can be suppressed. .

By the way, if the tip of the locking piece 26 is not connected to the bottom wall 10, the locking piece 26 will come off from the bottom wall 10, and an opening will be formed in the bottom wall 10. If the packaged item M is a small item, the packaged item M housed in the packaging box 1 may form on the bottom wall 10 before sealing (before inserting the insert piece 18 into the insertion port 25). It is possible that the product may fall from the opening. On the other hand, according to the packaging box 1 according to the present embodiment, the tip of the locking piece 26 extending from the side inner wall 11 is connected to the bottom wall 10 in the state before sealing (see FIG. 4A etc.). ), the locking piece 26 will not come off from the bottom wall 10 and an opening will not be formed in the bottom wall 10. Thereby, even if the packaged item M is small, it is possible to prevent the packaged item M from falling through the opening formed in the bottom wall 10. Note that when the insertion piece 18 is inserted into the insertion opening 25, the insertion piece 18 substantially closes the opening formed in the bottom wall 10, so there is no fear that the object M to be packaged will fall.

Furthermore, in the packaging box 1 according to the present embodiment, the amount of deviation (S2) of the locking fold line L7 from the edge of the insertion opening 25 is set to approximately twice the thickness of the insertion piece 18 (corrugated cardboard sheet). Ta. According to this configuration, the locking piece 26 can be made at an angle close to parallel to the insertion piece 18 (bottom wall 10). Thereby, the locking piece 26 (the tip thereof) engages with the locking hole 32 in a posture nearly parallel to the insertion piece 18, and can effectively resist the force in the direction of pulling out the insertion piece 18.

In addition, in the packaging box 1 according to the present embodiment described above, a pair of insertion ports 25 and a pair of locking pieces 26 are provided on both left and right sides of the box body 2, and a pair of side holes are provided on both left and right sides of the lid wall 16. Although the outer wall 17 and the pair of insertion pieces 18 were provided, the present invention is not limited thereto. At least one of the insertion port 25, the locking piece 26, the side outer wall 17, and the insertion piece 18 may be provided. For example, as a first modification, one insertion port 25 is formed along the boundary between the bottom wall 10 and the front wall 13 (another example of the inner wall), and one locking piece 26 is formed along the boundary between the bottom wall 10 and the front wall 13 (another example of the inner wall). It may be formed on the front wall 13, with one side outer wall 17 connected to the front end of the lid wall 16, and one insertion piece 18 connected to the tip of the side outer wall 17 (not shown).

Further, in the packaging box 1 according to the present embodiment, the bottom wall 10 and the lid wall 16 are arranged vertically to face each other, but the present invention is not limited to this. For example, as a second modification, in a rectangular cylindrical box body with openings on both the upper and lower sides, the first wall and the second wall constitute side surfaces facing each other, and the side inner wall 11 is connected to the upper end of the first wall. The side outer wall 17 may be connected to the upper end of the second wall, and the insertion piece 18 may be connected to the tip of the side outer wall 17 (not shown). In this case, the inner side wall 11 and the outer side wall 17 are folded together to form a lid that closes the top opening of the box body. Further, an insertion port 25 is formed at the boundary line between the first wall and the side inner wall 11, and a locking piece 26 is formed on the first wall and the side inner wall 11. In addition, the side inner wall 11, the side outer wall 17, the insertion port 25, the locking piece 26, and the insertion piece 18 are provided at the lower end of the box main body instead of/in addition to the upper end of the box main body (first wall, second wall). (not shown).

Furthermore, in the packaging box 1 according to the present embodiment (including the first and second modified examples; the same applies hereinafter), the tip of the locking piece 26 is connected to the bottom wall 10 via the cuttable line 27. However, the present invention is not limited thereto. In the state of the blank 1A, the tip of the locking piece 26 may be completely cut off from the bottom wall 10 (not shown).

Furthermore, in the packaging box 1 according to the present embodiment, the amount of deviation (S2) of the locking fold line L7 from the edge of the insertion opening 25 is set to approximately twice the thickness of the insertion piece 18; The invention is not limited to this. The amount of deviation (S2) may be set in a range of not less than half the thickness of the insertion piece 18 and not more than three times the thickness. Preferably, the amount of deviation (S2) is set within a range of 1 to 2 times the thickness of the insertion piece 18. The applicant has confirmed that by setting the amount of deviation (S2) within the above range, an effective effect of restricting the insertion piece 18 from being pulled out can be obtained.

Further, in the packaging box 1 according to the present embodiment, the opening cutting line 30 for opening is formed at the boundary between the lid wall 16 (first wall) and the side outer wall 17, but the present invention is not limited to this. For example, the unsealing cutting line 30 may be formed at the boundary between the side outer wall 17 and the insertion piece 18, or may be formed only on the side outer wall 17 so as to divide the side outer wall 17 (not shown). . Further, for example, the unsealing cutting line 30 may be formed on both the boundary between the lid wall 16 (first wall) and the side outer wall 17 and the boundary between the side outer wall 17 and the insertion piece 18, or the above-mentioned It may be formed on either one of the two boundaries and the side outer wall 17, or it may be formed on all of the two boundaries and the side outer wall 17 (not shown). That is, the unsealing cutting line 30 is formed on at least one of the boundary between the lid wall 16 (first wall) and the side outer wall 17, the boundary between the side outer wall 17 and the insertion piece 18, and the side outer wall 17. It would be fine if it had been done. Further, the unsealing cutting line 30 may be omitted, and the side outer wall 17 may be connected to the lid wall 16 via a general-purpose ruled line or the like (not shown).

Further, in the packaging box 1 according to the present embodiment, the cuttable line 27 is a perforation line, and the unsealing cutting line 30 is a zipper, but the present invention is not limited to this. The cuttable line 27 may be of any structure as long as it has a structure for cutting (dividing) the corrugated cardboard sheet, such as a half-cut line in which a cut is made in the corrugated cardboard sheet by about half the thickness. Similarly, the unsealing cutting line 30 may be of any structure, such as a perforation line or a half-cut line, as long as it has a structure for cutting (dividing) the corrugated cardboard sheet.

Further, in the packaging box 1 according to the present embodiment, the locking piece 26 and the locking hole 32 are formed in a substantially rectangular shape, but are not limited to this, and may have a trapezoidal shape, a polygonal shape other than a quadrangular shape, an elliptical shape, etc. (not shown). Further, although the side outer wall 17 and the insertion piece 18 are formed in a substantially trapezoidal shape (substantially hexagonal shape), they are not limited to this, and may be formed in a rectangular shape, a semicircular shape, etc. (not shown). ).

Further, in the packaging box 1 according to the present embodiment, the lid wall 16 covers a part of the front flap 14, but it may cover the entire front flap 14 (not shown). Further, although the inner side flap 12 and the front flap 14 were provided, one or both of these may be omitted (not shown).

Further, the packaging box 1 according to the present embodiment is formed of a double-sided corrugated cardboard sheet made of paper, but is not limited to this, and can be made of a single-sided corrugated sheet, a double-sided corrugated sheet, cardboard, or a resin board (sheet). It may also be formed by Moreover, although the packaging box 1 is formed in the shape of a substantially rectangular parallelepiped, the present invention is not limited to this, and a corner cut surface may be provided at the corner edge of the rectangular parallelepiped (not shown). That is, the packaging box 1 may be formed into a polygonal shape such as a hexagon or an octagon when viewed from a plane or a side. Further, the dimensions (width, depth, height) and shape of each part of the packaging box 1, the thickness of the corrugated cardboard sheet, the direction in which the corrugated cardboard 9A extends, etc. may be freely changed.

Note 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. The technical scope of the present invention is not limited to the above embodiments. The present invention may be variously changed, replaced, and modified without departing from the spirit of the technical idea, and the scope of the claims includes all embodiments that can be included within the scope of the technical idea.

1 Packaging box 10 Bottom wall (first wall)
11 Side inner wall (inner wall)
16 Lid wall (second wall)
17 Side outer wall (outer wall)
18 Insertion piece 25 Insertion port 26 Locking piece 27 Cuttable line 30 Unsealing cutting line 32 Locking hole L1 First folding line (border line)
L7 Locking fold line M Item to be packaged

Claims (3)

A packaging box (1) for packaging a packaged item (M),
a first wall (10);
a second wall (16) disposed opposite to the first wall with the storage space for the packaged object in between;
an inner wall (11) that is bent with respect to the first wall;
an outer wall (17) that is bent with respect to the second wall and covered with the inner wall;
an insertion piece (18) that is bent against the outer wall and inserted into an insertion opening (25) cut along the boundary line (L1) between the first wall and the inner wall;
A locking hole (32) is bored in the insertion piece at a position away from the boundary with the outer wall toward the tip side,
A locking piece (26) is provided on the first wall and the inner wall so as to straddle the insertion port,
The locking pieces are connected to each other via a locking fold line (L7) at a position shifted from the edge of the insertion port toward the inner wall, and are cut from both ends of the locking fold line to the first wall. formed by
The tip of the locking piece is connected to the first wall via a cuttable line (27),
The locking piece is bent at the locking fold line and the cuttable line as the inner wall is bent, and takes an inclined position with its tip facing the first wall ;
The tip of the locking piece in the inclined position is cut along the cuttable line by the insertion piece inserted into the insertion opening and pulled away from the first wall, and the insertion piece is pulled away from the first wall. The plug-in piece is engaged with the locking hole of the plug-in piece by a repulsive force around the locking fold line when inserted into a mouth, and the plug-in piece is prevented from being pulled out from the plug-in opening. packaging box. The amount of deviation of the locking fold line from the edge of the insertion opening is set in a range of 1 to 2 times the thickness of the insertion piece. packaging box. An opening cutting line (30) for opening is formed on at least one of the boundary between the second wall and the outer wall, the boundary between the outer wall and the insertion piece, and the outer wall. The packaging box according to claim 1 or 2 , characterized in that:

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