Packing box

Abstract

To provide a packing box which enables smooth resealing work.SOLUTION: A packing box 1 comprises: a lid 7A connected to both upper ends of side plates 21 and 23 to cover openings of upper end sides; a break line 63A formed in the side plate 23; and a flap 44 extending to an upper end of a side plate 24. The lid 7A can be opened in the state of being connected to the side plate 21 by breading the break line 63A. The packing box further comprises a lock piece 435A formed at a free end of the opened lid 7A, an engaging piece 445A formed in the flap 44, and a notch 447A connected to the engaging piece 445A. The lid 7A is placed from above the flap 44, and the lid 7A can be resealed by inserting the lock piece 435A into the backside of the engaging piece 445A.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] BACKGROUND ART Packaging boxes for containing and transporting products and displaying them in stores are known, which are made by assembling box-forming pieces that are punched out integrally from a single blank sheet into a cylindrical shape.

[0003] The packaging box described in Patent Document 1 has a cylindrical body with a front panel, a back panel, and two side panels connecting them. A main cover plate extends from the upper end of the front panel, a subsidiary cover plate extends from the upper end of the back panel, and left and right flaps extend from the upper ends of the left and right side panels. The left and right flaps are first folded, and then the main cover plate and subsidiary cover plate are folded and joined to form a cover that closes the opening at the top end of the cylindrical body. After the cover is opened, it can be resealed by sliding the locking pieces formed on the left and right sides of the free end of the cover behind the engaging pieces formed on the left and right flaps. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-210612 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the packaging box of Patent Document 1 does not have any mechanism for allowing the locking piece of the lid to slip behind the engaging pieces of the left and right flaps, which makes it difficult to perform a smooth resealing operation.

[0006] The present invention has been made in view of the above problems, and has as its object to provide a packaging box that allows for smooth resealing. [Means for solving the problem]

[0007] These objects can be achieved by the present invention as set forth in (1) to (7) below.

[0008] (1) A cylindrical body including a first side panel and a second side panel arranged opposite to each other, and a third side panel and a fourth side panel connecting the first side panel and the second side panel; a lid portion connected to one end of the first side panel and one end of the second side panel and closing an opening on one end side of the cylindrical body; a first break line formed in the first side panel; a first flap extending from one end of the third side panel; The cover can be opened while being connected to the second side panel by breaking the first breaking line, moreover, a first locking piece formed at a free end of the opened lid; a first engagement piece formed on the first flap and a first notch continuing from the first engagement piece, A resealable packaging box, characterized in that the lid portion is placed over the first flap and the first locking piece is inserted into the back side of the first engaging piece, thereby resealing the lid portion.

[0009] (2) The packaging box according to (1) above, which has a second flap extending from one end of the fourth side panel.

[0010] (3) The first locking pieces are formed in pairs on both sides of the free end of the opened lid, The packaging box according to (2) above, wherein the first locking piece and the first notch are formed in pairs on the first flap and the second flap.

[0011] (4) A second break line is formed in the second side panel, The cover can be opened while being connected to the first side panel by breaking the second breaking line, moreover, a second locking piece formed at a free end of the opened lid; a second engagement piece formed on the first flap or the second flap and a second notch continuing from the second engagement piece, A packaging box as described in (2) or (3) above, in which the lid portion is placed over the first flap and the second flap, and the lid portion is resealed by inserting the second locking piece into the back side of the second engaging piece.

[0012] (5) The second locking pieces are formed in pairs on both sides of the free end of the lid, The packaging box according to (4) above, wherein the second locking piece and the second notch are formed in pairs on the first flap and the second flap.

[0013] (6) A cylindrical body having four side plates, including a first side plate and a second side plate arranged opposite each other, and a third side plate and a fourth side plate connecting the first side plate and the second side plate; a lid portion connected to one end of the first side panel and one end of the second side panel and closing an opening on one end side of the cylindrical body; a first break line formed in the first side panel; a first flap extending from one end of the third side panel; The cover can be opened while being connected to the second side panel by breaking the first breaking line, moreover, a first locking piece formed at a free end of the opened lid; a first engagement piece formed on the first flap; a notch formed along the boundary between the adjacent side panels from the opening, A resealable packaging box, characterized in that the lid portion is placed over the first flap and the lid portion is resealed by squeezing the first locking piece into the back side of the first engaging piece.

[0014] (7) The first side panel is connected to the third side panel or the fourth side panel via a glue plate, and the notch is formed at the boundary between the second side panel and the third side panel or the fourth side panel, The packaging box according to (6) above, wherein the second side panel is connected to the third side panel or the fourth side panel via a glue tab, and the notch is formed at the boundary between the first side panel and the third side panel or the fourth side panel. [Effects of the Invention]

[0015] According to this invention, since the first flap has a first notch, the first flap is deformed so that the first notch opens when force is applied during resealing, allowing the first locking piece to engage with the first engaging piece with less force (amount of pushing). Also, according to another invention, since a notch is formed along the boundary between the opening of the cylindrical body and the adjacent side panel, the opening easily widens when force is applied during resealing, allowing the first locking piece to engage with the first engaging piece with less force (amount of pushing). Therefore, this invention provides a packaging box that allows for smooth resealing. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a development view of the packaging box according to the first embodiment. [Figure 2] FIG. 10 is a development view showing the assembly procedure of the packaging box. [Figure 3] FIG. 10 is a development view showing the assembly procedure of the packaging box. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view showing a state in the middle of a resealing state. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] FIG. 10 is a perspective view showing a state in the middle of a resealing state. [Figure 9] FIG. [Figure 10]FIG. 10 is a development view of a packaging box according to a second embodiment. [Figure 11] FIG. [Figure 12] FIG. 10 is a perspective view showing a state in the middle of a resealing state. [Figure 13] FIG. [Figure 14] FIG. [Figure 15] FIG. 10 is a perspective view showing a state in the middle of a resealing state. [Figure 16] FIG. [Figure 17] FIG. 10 is a development view showing a modified example of the fold line. [Figure 18] FIG. 10 is a development view showing a modified example of the fold line. [Figure 19] FIG. 10 is a development view showing a modified example of the fold line. [Figure 20] FIG. 10 is a development view of a packaging box according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0017] First Embodiment The packaging box 1 of this embodiment is formed by assembling box-forming pieces 10 that are integrally formed by punching out a blank sheet made of paper or the like. For ease of explanation, the folding method that makes the front surface of the box-forming pieces 10 convex is also referred to as a "normal folding," and the folding method that makes the back surface convex is also referred to as a "reverse folding." In addition, the upper side in FIG. 1 is referred to as "top," and the lower side is referred to as "bottom."

[0018] FIG. 1 is a development view of box-forming piece 10 as seen from the front. As shown in the figure, box-forming piece 10 has a glue tab 20, a side panel 21, a side panel 22, a side panel 23, and a side panel 24 that are connected laterally. The direction of connection (the horizontal direction) of these panels corresponds to the grain of the blank sheet. Of these four side panels 21, 22, 23, and 24, one of side panels 21 and 23 is the first side panel, and the other is the second side panel. One of side panels 22 and 24 is the third side panel, and the other is the fourth side panel. Hereinafter, for ease of explanation, side panel 23 will be referred to as the first side panel, side panel 21 as the second side panel, side panel 24 as the third side panel, and side panel 22 as the fourth side panel.

[0019] Furthermore, the glue board 20, the side board 21, the side board 22, the side board 23, and the side board 24 are respectively separated by fold lines 31, 32, 33, and 34 extending in the vertical direction. Specifically, the glue board 20 and the side board 21 are separated by the fold line 31, the side board 21 and the side board 22 are separated by the fold line 32, the side board 22 and the side board 23 are separated by the fold line 33, and the side board 23 and the side board 24 are separated by the fold line 34.

[0020] In box-body forming piece 10, side panels 21 and 23 have the same width, and side panels 22 and 24 have the same width. Furthermore, the width of side panels 21 and 23 is greater than the width of side panels 22 and 24. However, the relationship between the width of side panels 21 and 23 and the width of side panels 22 and 24 is not limited to this. Furthermore, in box-body forming piece 10, side panels 21 and 23 are slightly longer than side panels 22 and 24, and at the upper and lower ends, a step of approximately the thickness of two blank sheets is formed between side panels 23 and 22 and 24, and a step of approximately the thickness of one blank sheet is formed between side panels 21 and 22.

[0021] Additionally, a lid piece 43A extends from the upper end of side panel 23. Side panel 23 and lid piece 43A are separated by a perforated fold line 53A extending laterally. Similarly, a lid piece 43B extends from the lower end of side panel 23. Side panel 23 and lid piece 43B are separated by a fold line 53B extending laterally.

[0022] In addition, a break line 63A (first break line) is formed at the upper end of the side panel 23. The break line 63A is formed at the boundary between the side panel 23 and the lid piece 43A so as to divide them, and has both end portions along the fold line 53A and a U-shaped central portion that extends from the fold line 53A into the side panel 23. The portion surrounded by the U-shaped portion and the fold line 53A forms the tearable portion 230A. The tearable portion 230A is rectangular. However, the shape of the tearable portion 230A is not particularly limited.

[0023] Similarly, a break line 63B is formed at the lower end of the side panel 23. The break line 63B is formed at the boundary between the side panel 23 and the lid piece 43B to divide them, and has both end portions along the fold line 53B and a U-shaped central portion that extends from the fold line 53B into the side panel 23. The portion surrounded by the U-shaped portion and the fold line 53B forms the tearable portion 230B. The tearable portion 230B is rectangular. However, the shape of the tearable portion 230B is not particularly limited.

[0024] Furthermore, a lid piece 41A extends from the upper end of side panel 21. Side panel 21 and lid piece 41A are separated by a perforated fold line 51A extending laterally. Similarly, a lid piece 41B extends from the lower end of side panel 21. Side panel 21 and lid piece 41B are separated by a fold line 51B extending laterally. When packaging box 1 is assembled, lid pieces 43A, 41A are glued together to form lid portion 7A that closes the upper opening of packaging box 1, and lid pieces 43B, 41B are glued together to form lid portion 7B that closes the lower opening of packaging box 1.

[0025] Furthermore, a break line 61A (second break line) is formed at the upper end of the side panel 21. The break line 61A is formed at the boundary between the side panel 21 and the lid piece 41A so as to divide them, and has both end portions along the fold line 51A and a U-shaped central portion that extends from the fold line 51A into the side panel 21. The portion surrounded by the U-shaped portion and the fold line 51A forms the tearable portion 210A. The tearable portion 210A is rectangular. However, the shape of the tearable portion 210A is not particularly limited.

[0026] Similarly, a break line 61B is formed at the lower end of the side panel 21. The break line 61B is formed at the boundary between the side panel 21 and the lid piece 41B to divide them, and has both end portions along the fold line 51B and a U-shaped central portion that extends into the side panel 21 from the fold line 51B. The portion surrounded by the U-shaped portion and the fold line 51B forms the tearable portion 210B. The tearable portion 210B is rectangular. However, the shape of the tearable portion 210B is not particularly limited.

[0027] Furthermore, a flap 42A (second flap) extends from the upper end of the side panel 22. The side panel 22 and the flap 42A are separated by a perforated fold line 52A that extends laterally. Furthermore, a flap 44A (first flap) extends from the upper end of the side panel 24. The side panel 24 and the flap 44A are separated by a perforated fold line 54A that extends laterally. When the packaging box 1 is assembled, the flaps 42A and 44A are located inside the lid portion 7A, preventing the lid portion 7A from slipping into the packaging box 1.

[0028] Similarly, a flap 42B extends from the lower end of side panel 22. Side panel 22 and flap 42B are separated by a perforated fold line 52B that extends horizontally. Furthermore, a flap 44B extends from the lower end of side panel 24. Side panel 24 and flap 44B are separated by a perforated fold line 54B that extends horizontally. When packaging box 1 is assembled, flaps 42B, 44B are located inside lid portion 7B, preventing lid portion 7B from slipping inside packaging box 1.

[0029] Above is a brief description of the overall configuration of the packaging box 1. Next, particularly characteristic parts of the packaging box 1 will be described in detail.

[0030] The lid piece 43A is generally trapezoidal. The lid piece 43A is asymmetrical, with a V-shaped notch 433A formed on only one side (the right side). By breaking the break line 63A, the portion of the lid piece 43A closer to the base than the notch 433A appears as a locking piece 435A (first locking piece) that protrudes laterally from the free end of the lid portion 7A (see FIG. 4). The contour line L1A of the locking piece 435A (a line that follows the contour of the box-body forming piece 10) is bent in a V shape. However, the shape of the contour line L1A is not particularly limited and may be, for example, an arc shape.

[0031] Similarly, the lid piece 43B is substantially trapezoidal. The lid piece 43B is asymmetrical, with a V-shaped notch 433B formed on only one side (the left side). By breaking the breaking line 63B, the portion of the lid piece 43B on the base side of the notch 433B appears as a locking piece 435B that protrudes laterally from the free end of the lid portion 7B. The contour line L1B of the locking piece 435B (a line that follows the contour of the box-body forming piece 10) is bent in a V shape. However, the shape of the contour line L1B is not particularly limited and may be, for example, an arc shape.

[0032] These lid pieces 43A and 43B have the same shape.

[0033] The lid piece 41A has a symmetrical shape. The lid piece 41A has a tapered portion in the extending direction, gradually decreasing in width toward the free end, with the portion closer to the free end than the tapered portion being narrower than the portion closer to the base. Therefore, the base portion of the lid piece 41A has locking pieces 415A, 416A (second locking pieces) protruding to both the left and right. The locking pieces 415A, 416A appear to protrude laterally from the free end of the lid portion 7A by breaking the breaking line 61A (see FIG. 7). The contour line L2A of the locking pieces 415A, 416A (a line following the contour of the box-body forming piece 10) is bent in a V shape. However, the shape of the contour line L2A is not particularly limited and may be, for example, an arc shape.

[0034] Similarly, the lid piece 41B has a symmetrical shape. The lid piece 41B has a tapered portion in the extending direction, gradually decreasing in width toward the free end, with the portion closer to the free end than the tapered portion being narrower than the portion closer to the base. Therefore, the base portion of the lid piece 41B has locking pieces 415B and 416B protruding on both the left and right sides. The locking pieces 415B and 416B protrude laterally from the free end of the lid portion 7B by breaking the breaking line 61B. The contour line L2B of the locking pieces 415B and 416B (a line following the contour of the box-forming piece 10) is bent in a V shape. However, the shape of the contour line L2B is not particularly limited and may be, for example, an arc shape.

[0035] These lid pieces 41A and 41B have the same shape.

[0036] The flap 44A has a symmetrical shape. The flap 44A has V-shaped notches 443A and 444A formed on both the left and right sides. The portion closer to the base than the notch 443A becomes an engagement piece 445A (first engagement piece) that engages with the locking piece 435A, and the portion closer to the base than the notch 444A becomes an engagement piece 446A (second engagement piece) that engages with the locking piece 415A. The contour line L3A of the engagement pieces 445A and 446A (a line that follows the contour of the box-forming piece 10) is bent in a V shape. However, the shape of the contour line L3A is not particularly limited and may be, for example, an arc shape.

[0037] The flap 44A also has a notch 447A (first notch) cut inward from the apex (top) of the notch 443A so as to be continuous with the engagement piece 445A, and a notch 448A (second notch) cut inward from the apex (top) of the notch 444A so as to be continuous with the engagement piece 446A. The notches 447A and 448A extend diagonally laterally from the apexes of the notches 443A and 444A, and then curve or bend toward the free ends. By forming the notches 447A and 448A, the portion Q between the notch 447A and the notch 443A becomes more flexible in the thickness direction relative to the locking piece 435A, and the portion between the notch 448A and the notch 444A becomes more flexible in the thickness direction relative to the locking piece 415A.

[0038] Similarly, flap 42B has a symmetrical shape. V-shaped notches 423B and 424B are formed on both the left and right sides of flap 42B. The portion closer to the base than notch 423B becomes engagement piece 425B, which engages with locking piece 435B, and the portion closer to the base than notch 424B becomes engagement piece 426B, which engages with locking piece 415B. Furthermore, a contour line L3B (a line that follows the contour of box-body forming piece 10) of engagement pieces 426B and 425B is bent in a V shape. However, the shape of contour line L3B is not particularly limited and may be, for example, an arc shape.

[0039] The flap 42B also has a notch 427B cut inward from the apex (top) of the notch 423B so as to be continuous with the engagement piece 425B, and a notch 428B cut inward from the apex (top) of the notch 424B so as to be continuous with the engagement piece 426B. The notches 427B and 428B extend diagonally laterally from the apexes of the notches 423B and 424B, and then curve or bend toward the free ends. By forming such notches 427B and 428B, the portion Q between the notch 427B and the notch 423B becomes more flexible in the thickness direction relative to the engagement piece 425B, and the portion between the notch 428B and the notch 424B becomes more flexible in the thickness direction relative to the locking piece 415B.

[0040] These flaps 44A and 44B have the same shape.

[0041] Furthermore, a notch 8A is formed between the side panels 22 and 23 from the upper end along the fold line 33, and a notch 8B is formed between the side panels 23 and 24 from the lower end along the fold line 34. By forming the notches 8A and 8B, the upper and lower openings of the packaging box 1 can be easily widened, making resealing easier. However, the positions and number of the notches 8A and 8B are not particularly limited.

[0042] The length of the cuts 8A and 8B is not particularly limited, but is preferably about 0.1 mm to 1.0 mm, and more preferably about 0.5 mm. By setting the length to such a value, the strength of the packaging box 1 can be prevented from decreasing, and the above-mentioned effects can be fully exhibited.

[0043] Above, we have explained in detail the characteristic parts of the packaging box 1. Next, an example of a method for assembling and using the packaging box 1 will be explained.

[0044] First, as shown in Figure 2, the fold line 32 is folded 180° and glue B1 is applied to the surface of the glue tab 20. Next, as shown in Figure 3, the fold line 34 is folded 180° and the surface of the glue tab 20 and the back surface of the side panel 24 are glued together. This completes the finished state (the state immediately before assembly).

[0045] Next, at a factory where the contents are stored and packaged, fold lines 31, 32, 33, and 34 are each folded 90° to form a rectangular tube. Next, flaps 42B and 44B are folded 90° along fold lines 52B and 54B. Next, lid piece 41B is folded 90° along fold line 51B and placed on top of flaps 42B and 44B. Next, glue is applied to the surface of lid piece 41B, lid piece 43B is folded 90° along fold line 53B, and its back surface is glued to the surface of lid piece 41B.

[0046] Through these steps, the lid portion 7B, which is a joined body of the lid pieces 43B and 41B, is formed. The opening at the bottom end of the packaging box 1 is then closed by this lid portion 7B, completing the bottom surface of the packaging box 1. In the lid portion 7B, the locking pieces 415B and 416B are exposed to the outside of the lid piece 43B. Alternatively, the lid piece 41B may be placed on top of the lid piece 43B. In this case, the locking piece 435B is exposed to the outside of the lid piece 41B.

[0047] Next, in this state, an item (not shown) is placed into the packaging box 1 through the opening at the top end of the packaging box 1. After the items have been placed into the packaging box 1, the top surface is formed in the same manner as the bottom surface. First, the flaps 42A and 44A are folded 90° along the fold lines 52A and 54A, respectively. Next, the lid piece 41A is folded 90° along the fold line 51A and placed on top of the flaps 42A and 44A. Next, glue is applied to the surface of the lid piece 41A, and the lid piece 43A is folded 90° along the fold line 53A, and its back surface is glued to the surface of the lid piece 41A.

[0048] Through these steps, the lid portion 7A, which is a joined body of the lid pieces 43A and 41A, is formed. The opening at the top end of the packaging box 1 is then closed by this lid portion 7A, completing the top surface of the packaging box 1. Through the above steps, the packaging box 1 is assembled, and the packaging of the contents is completed. In the lid portion 7A, the locking pieces 415A and 416A are exposed to the outside of the lid piece 43A. Conversely, the lid piece 41A may be placed on top of the lid piece 43A. In this case, the locking piece 435A is exposed to the outside of the lid piece 41A.

[0049] When removing the contents from the packaging box 1, the opening portion 230A of the side panel 23 is pressed with a finger to break the breaking line 63A, and the opening portion 230A is separated from the side panel 23. Then, the fingers are hooked on the inside of the lid portion 7A and the lid portion 7A is raised, thereby opening the packaging box 1 as shown in Fig. 4. Furthermore, the flaps 42A and 44A are opened to open the upper opening, and the contents inside the packaging box 1 are removed.

[0050] After opening, when returning the contents to the packaging box 1 and resealing it, the flaps 42A and 44A are closed, and then the lid 7A is closed on top of them, as shown in Fig. 5. In this state, the locking piece 435A is positioned above the engaging piece 445A. Next, the free end of the lid 7A is pressed with a finger, causing that part to be depressed and deformed so as to slip into the packaging box 1, and as shown in Fig. 6, the locking piece 435A is inserted into the back side of the engaging piece 445A, and they are engaged. This closes the opening on the top end of the packaging box 1 with the lid 7A.

[0051] In particular, with the packaging box 1, when the free end of the lid portion 7A is pressed with a finger, the flap 44A is deformed so that the notch 447A opens (the portion Q is displaced downward relative to the engaging piece 445A), so that the locking piece 435A can be pushed in behind the engaging piece 445A with a small amount of pushing (force). This makes the resealing operation smoother. Furthermore, after resealing, the lid portion 7A is sandwiched between the portion Q and the engaging piece 445A due to the restoring force of the portion Q, so the resealed state is maintained more reliably.

[0052] Furthermore, when the free end of the lid portion 7A is pressed with a finger, the notch 8A opens, widening the upper end opening and spreading the flap 42A outward, allowing the locking piece 435A to slip under the rear surface of the engaging piece 445A with a small amount of pushing force. In particular, because the notch 8A is formed on the free end side of the lid portion 7A, the opening on the free end side of the lid portion 7A is more likely to spread. Therefore, the above-mentioned effect is more pronounced. Furthermore, by forming the notch 8A on the flap 42A side opposite the flap 44A having the engaging piece 445A, rather than on the flap 44A side having the engaging piece 445A, unintended displacement of the engaging piece 445A (displacement in the direction of disengaging the engagement) due to the spreading of the notch 8A can be effectively prevented, and the resealed state can be more securely maintained.

[0053] Furthermore, as locking piece 435A slips behind engaging piece 445A, the free end of lid portion 7A slips slightly into packaging box 1, and as a result, tearing portion 230A is inserted into the opening formed in side panel 23 by its rupture, and tearing portion 230A engages with side panel 23. In other words, with packaging box 1, the main engagement is between locking piece 435A and engaging piece 445A, and the secondary engagement is between tearing portion 230A and side panel 23, thereby more reliably maintaining the resealed state.

[0054] As described above, in the pasted state, fold lines 32 and 34 are folded at 180°, and fold lines 31 and 33 are not folded (see FIG. 3). Therefore, even if fold lines 31, 32, 33, and 34 are folded at 90° to form a tubular body at a factory, a restoring force F that attempts to return the tubular body to the pasted state remains. Therefore, by forming locking piece 435A on flap 44A rather than on flap 42A, the restoring force F increases the engagement strength between locking piece 435A and engaging piece 445A, making the resealable state stronger.

[0055] In addition to the above procedure, when removing contents from the packaging box 1, the opening portion 210A of the side panel 21 may be pressed with a finger to break the breaking line 61A and separate the opening portion 210A from the side panel 21. Then, by hooking a finger on the inside of the lid portion 7A and lifting the lid portion 7A, the packaging box 1 is opened as shown in Fig. 7. Then, the flaps 42A and 44A are opened to open the packaging box 1, and the contents inside the packaging box 1 can be removed.

[0056] After opening, when returning the contents to the packaging box 1 and resealing it, the flaps 42A and 44A are closed, and then the lid 7A is closed on top of them, as shown in Fig. 8. In this state, the locking piece 415A is positioned above the engaging piece 446A. Next, the free end of the lid 7A is pressed with a finger, causing that part to be depressed and deformed so as to slip into the packaging box 1, and as shown in Fig. 9, the locking piece 415A is inserted into the back side of the engaging piece 446A, and they are engaged. This closes the opening on the top end of the packaging box 1 with the lid 7A.

[0057] In particular, according to packaging box 1, when the free end of lid portion 7A is pressed with a finger, flap 44A is deformed so that notch 448A opens (part Q is displaced downward relative to engaging piece 446A), so that locking piece 415A can be pushed into the back side of engaging piece 446A with a small amount of pushing (force). Furthermore, after resealing, lid portion 7A is sandwiched between part Q and engaging piece 446A due to the restoring force of part Q, so the resealed state is maintained more reliably.

[0058] Furthermore, because the corner E24 of the side panel 24 is not glued to the adhesive tab 20 (see FIG. 3), when the free end of the lid portion 7A is pressed with a finger, the corner E24 bends outward as if it is being rolled up from the adhesive tab 20, widening the upper end opening and widening the flap 44A. Therefore, the locking piece 415A can be pushed into the back side of the engaging piece 446A with a small amount of pushing (force). In particular, because the corner E24 is located on the free end side of the lid portion 7A, the opening on the free end side of the lid portion 7A is easily widened. Therefore, the above-mentioned effect becomes more pronounced.

[0059] Furthermore, in this embodiment, since the locking piece 415A and the engaging piece 446A each have a V-shaped bent shape, the overlapping width of the two pieces is increased, and the resealed state is maintained more reliably.

[0060] Furthermore, as locking piece 415A slips behind engaging piece 446A, the free end of lid portion 7A slips slightly into packaging box 1, and as a result, tearing portion 210A is inserted into the opening formed in side panel 21 by the rupture, and tearing portion 210A engages with side panel 21. In other words, with packaging box 1, the resealed state can be maintained more reliably by using the engagement between locking piece 415A and engaging piece 446A as the main engagement and the engagement between tearing portion 210A and side panel 21 as a supplementary engagement.

[0061] When disassembling the packaging box 1 for disposal, the lid portion 7B is opened in the same manner as when opening the packaging box, and the packaging box 1 is folded thinly in the same manner as when it is attached. This allows it to be disposed of in a compact form.

[0062] In the above description, the opening at the top end of the packaging box 1 is opened and resealed, but this is not limiting and the opening at the bottom end of the cylindrical body may be opened and resealed. In this case, too, the same effect as when the opening at the top end is opened and resealed can be achieved.

[0063] In addition, in this embodiment, both engagement pieces 445A and 446A are formed on the flap 44A, but this is not limited to this, and for example, the engagement piece 446A may be formed on the flap 42A and configured to engage with the locking piece 416A.

[0064] Second Embodiment In the following description, the packaging box 1 of this embodiment will be described focusing on the differences from the first embodiment described above, and a description of the same points will be omitted. In addition, in each drawing of this embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals.

[0065] 10 is a development view of the box-forming piece 10 of this embodiment, viewed from the front. As shown in the figure, the lid piece 43A is a generally trapezoidal shape that is symmetrical from left to right. Furthermore, V-shaped notches 433A and 434A are formed on both the left and right sides of the lid piece 43A. By breaking the break line 63A (first break line), the portions closer to the base than the notches 433A and 434A appear as locking pieces 435A and 436A (first locking pieces) that protrude laterally from the free end of the lid portion 7A.

[0066] Similarly, lid piece 43B is a generally trapezoidal shape that is symmetrical on both sides. Also, V-shaped notches 433B and 434B are formed on both the left and right sides of lid piece 43B. By breaking rupture line 63B, the base portions of lid piece 43B relative to notches 433B and 434B appear as locking pieces 435B and 436B that protrude laterally from the free end of lid portion 7B.

[0067] In addition, a pair of fold lines 9 are formed at the base of the flap pieces 41A, 41B, 43A, 43B, extending parallel to each other from both ends of the tearing portions 210A, 210B, 230A, 230B along the extension direction of the flap pieces 41A, 41B, 43A, 43A.

[0068] Flaps 42A and 44B have the same shape as flaps 42B and 44A. V-shaped notches 423A and 424A are formed on both the left and right sides of flap 42A. The portion closer to the base than notch 423A becomes engagement piece 425A (first engagement piece) that engages with locking piece 436A, and the portion closer to the base than notch 424A becomes engagement piece 426A (second engagement piece) that engages with locking piece 416A. Furthermore, flap 42A has notch 427A (first notch) cut inward from the apex (top) of notch 423A, and notch 428A (second notch) cut inward from the apex (top) of notch 424A.

[0069] Similarly, flap 44B has V-shaped notches 443B and 444B on both the left and right sides. The portion closer to the base than notch 443B becomes engagement piece 445B that engages with locking piece 436B, and the portion closer to the base than notch 444B becomes engagement piece 446B that engages with locking piece 416B. Furthermore, flap 44B has notches 447B and 448B cut inward from the vertices of notches 443B and 444B.

[0070] The packaging box 1 is obtained by assembling such box-body forming pieces 10 in the same manner as in the first embodiment described above. To remove the contents from the packaging box 1, as shown in Figure 11, the opening portion 230A of the side panel 23 is pressed with a finger to break the breaking line 63A, and the opening portion 230A is separated from the side panel 23.

[0071] After opening, when returning the contents to the packaging box 1 and resealing it, the flaps 42A and 44A are closed, and then the lid 7A is closed on top of them, as shown in Fig. 12. In this state, the locking pieces 435A and 436A are positioned above the engaging pieces 445A and 425A. Next, the free end of the lid 7A is pressed with a finger, causing the part to be depressed and deformed so that it slides into the packaging box 1, and as shown in Fig. 13, the locking pieces 435A and 436A are inserted into the backsides of the engaging pieces 445A and 425A, engaging them. This closes the opening at the top end of the packaging box 1 with the lid 7A.

[0072] In particular, in this embodiment, the fold line 9 is formed at the free end of the lid portion 7A, so that when the free end of the lid portion 7A is pressed with a finger, the fold line 9 causes the lid portion 7A to bend more, and the locking pieces 435A, 436A can be pushed into the backside of the engaging pieces 445A, 425A with a smaller amount of pressing force, making the resealing operation smoother.

[0073] In addition to the above procedure, when removing the contents from the packaging box 1, as shown in Figure 14, the tearing portion 210A of the side panel 21 can be pressed with a finger to break the breaking line 61A, and the tearing portion 210A can be separated from the side panel 21.

[0074] After opening, when returning the contents to the packaging box 1 and resealing it, the flaps 42A and 44A are closed, and then the lid 7A is closed on top of them, as shown in Fig. 15. In this state, the locking pieces 415A and 416A are positioned above the engaging pieces 446A and 426A. Next, the free end of the lid 7A is pressed with a finger, causing the part to be depressed and deformed so that it slides into the packaging box 1, and as shown in Fig. 16, the locking pieces 415A and 416A are inserted into the backsides of the engaging pieces 446A and 426A, engaging them. This closes the opening at the top end of the packaging box 1 with the lid 7A.

[0075] The second embodiment as described above can also achieve the same effects as the first embodiment. In the above description, the opening on the upper end side of the packaging box 1 is opened and resealed, but this is not limiting, and the opening on the lower end side of the cylindrical body may also be opened and resealed. In this case, too, the same effects as when the opening on the upper end side is opened and resealed can be achieved.

[0076] As a modification of the creases formed on the lid portion 7A, for example, as shown in FIG. 17, a pair of fold lines 9 may be arranged in a V-shape, starting from both ends of the tear-open portion 210A and gradually increasing in distance toward the free end. The same applies to the lid pieces 41B, 43A, and 43B. Also, as shown in FIG. 18, a single fold line 9 may be formed in the center of the base of the lid piece 41A along its extending direction. The same applies to the lid pieces 41B, 43A, and 43B. Also, as shown in FIG. 19, a single fold line 9 may be arranged in a substantially arc shape, connecting the vertices of the notches 433A and 434A and having a center closer to the base than the both ends. The same applies to the lid piece 43B. These fold lines 9 can also achieve the same effects as the present embodiment.

[0077] <Third embodiment> In the following description, the packaging box 1 of this embodiment will be described focusing on the differences from the first embodiment described above, and a description of the same points will be omitted. In addition, in each drawing of this embodiment, the same components as those in the above-described embodiment are denoted by the same reference numerals.

[0078] 20 is a development view of box-body forming piece 10 of this embodiment as seen from the front. As shown in the figure, in box-body forming piece 10 of this embodiment, compared to the second embodiment described above, fracture line 61B is omitted from side panel 21, and fracture line 63A is omitted from side panel 23. Furthermore, notch 423A, engagement piece 425A, and notch 427A are omitted from flap 42A, and notch 424B, engagement piece 426B, and notch 428B are omitted from flap 42B. Furthermore, notch 443A, engagement piece 445A, and notch 447A are omitted from flap 44A, and notch 444B, engagement piece 446B, and notch 448B are omitted from flap 44B.

[0079] The packaging box 1 is obtained by assembling such box-body forming pieces 10 in the same manner as in the first embodiment described above. When removing the contents from the packaging box 1 or resealing it, the same procedures as those shown in Figures 14 to 16 of the second embodiment described above can be carried out.

[0080] In this embodiment, side panel 21 is the first side panel, breaking line 61A is the first breaking line, locking pieces 415A and 416A are first locking pieces, engaging pieces 426A and 446A are first engaging pieces, and notches 428A and 448A are first notches.

[0081] The third embodiment as described above can also achieve the same effects as the first embodiment.

[0082] The packaging box of the present invention is not limited to the above-described embodiment, and the size, material, and shape of each component of the box body can be changed as appropriate. The above-described embodiments can also be combined as appropriate. In the above-described embodiment, the upper and lower ends have the same configuration, but this is not limited to this, and it is sufficient that at least one side has the above-described configuration. In other words, the configuration of one opening side is not particularly limited, and for example, it may be a configuration other than a sealed end carton (A-type carton). [Explanation of symbols]

[0083] 1...packaging box, 10...box body forming piece, 20...glue plate, 21, 22, 23, 24...side plate, 210A, 210B, 230A, 230B...opening portion, 31, 32, 33, 34...fold line, 41A, 41B...lid piece, 415A, 415B, 416A, 416B...locking piece, 42A, 42B...flap, 423A, 423B, 424A, 424B...notch, 425A, 425B, 426A, 426B...engagement piece, 427A, 427B, 428A, 428B...notch, 43A, 43B...lid piece, 433A, 433B, 434A, 434B...notch, 435 A, 435B, 436A, 436B...Latching piece, 44A, 44B...Flap, 443A, 443B, 444A, 444B...Notch, 445A, 445B, 446A, 446B...Engaging piece, 447A, 447B, 448A, 448B...Notch, 51A, 51B, 52A, 52B, 53A, 53B, 54A, 54B...Folding line, 61A, 61B, 63A, 63B...Rupture line, 7A, 7B...Cover part, 8A, 8B...Notch, 9...Folding line, B1...Glue, E24...Corner part, F...Restoring force, L1A, L1B, L2A, L2B, L3A, L3B...Contour line, Q...Part

Claims

1. a cylindrical body including a first side panel and a second side panel arranged opposite to each other, and a third side panel and a fourth side panel connecting the first side panel and the second side panel; a cover portion connected to one end of the first side panel and one end of the second side panel and configured to close an opening on one end side of the cylindrical body; a first break line formed in the first side panel; a first flap extending from one end of the third side panel; The cover can be opened while being connected to the second side panel by breaking the first breaking line, moreover, a first locking piece formed on a free end of the opened lid; a first engagement piece formed on the first flap and a first notch continuing from the first engagement piece, A resealable packaging box characterized in that the lid portion is placed over the first flap and the lid portion is resealed by inserting the first locking piece into the back side of the first engaging piece without folding the free end of the lid portion into the cylindrical body.

2. 2. The packaging box according to claim 1, further comprising a second flap extending from one end of the fourth side panel.

3. The first locking pieces are formed in pairs on both sides of a free end of the opened lid portion, The packaging box according to claim 2, wherein the first engagement piece and the first notch are formed in pairs on the first flap and the second flap.

4. A packaging box as described in Claim 1, wherein the first locking piece is formed only at the end of the free end of the opened lid portion on the first flap side.

5. In the pasted state, the first side panel and the third side panel and the second side panel and the fourth side panel are folded in a normal manner and crushed, A restoring force that tends to return the cylindrical body to the pasted state remains in the cylindrical body, 5. The packaging box according to claim 4, wherein the first locking piece is biased toward the first engaging piece by the restoring force.

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