Packing box

Abstract

To provide a re-closable packaging box capable of improving convenience.SOLUTION: A packaging box 1 formed by folding a blank plate 50 includes: a rear surface plate 23 having a hinge line 6 extending rightward and leftward; a front surface plate 21 opposing to the rear surface plate 23; a pair of left and right side surface plates 22, 24 for connecting the front surface plate 21 and the rear surface plate 23; a cuttable opening line 11 arranged above the front surface plate 21 and the side surface plates 22, 24, and for connecting both ends of the hinge line 6; a folding piece 36 surrounded by a first folding line 7 arranged above the opening line 11 of the front surface plate 21 and extending rightward and leftward and a cuttable first cutting line 12 which connects both ends of the first folding line 7 and which protrudes upward; an adhesive plate 34 which is adhered to the rear surface of the front surface plate 21 at the outside of the folding piece 36; a slit 38 arranged below the opening line 11 of the front surface plate 21; and a locking part 37 which is provided at the folding piece 36 and which locks the folding piece 36 by being inserted in the slit 38 when the folding piece 36 is folded at the first folding line 7.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] A conventional reclosable packaging box is disclosed in Patent Document 1. This packaging box is formed by folding a paper blank plate, and includes a front panel and a rear panel facing each other from front to back, a pair of side panels facing each other from left to right, and a top panel and a bottom panel facing each other from top to bottom. A hinge line extending from left to right is provided on the rear panel. Perforated opening lines connecting both ends of the hinge line are provided on the front panel and the side panels. In addition, an adhesive plate is adhered to the back surface of the front panel, protruding below the opening line.

[0003] The packaging box is opened by cutting the front panel and side panels along the opening line, and the upper lid rotates around the hinge line relative to the main body below the opening line. When the lid is closed, the lower end of the adhesive plate engages with the back side of the front panel of the main body, restricting the rotation of the lid and allowing the packaging box to be reclosed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 5617486 (pages 2-3, Figure 2) Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the conventional packaging box described above, the adhesive plate protrudes only slightly from the opening line, which can cause the adhesive plate to fall off the main body after reclosing. On the other hand, if the adhesive plate protrudes too much from the opening line, it becomes difficult to insert the adhesive plate behind the front panel during reclosing. This results in a problem of poor usability for the packaging box.

[0006] An object of the present invention is to provide a reclosable packaging box that can improve convenience. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a packaging box formed by folding a blank plate, the packaging box comprising: a rear panel having a hinge line extending left and right; a front panel facing the rear panel; a pair of left and right side panels connecting the front panel and the rear panel; a tearable opening line arranged on the front panel and the side panels connecting both ends of the hinge line; a folding piece surrounded by a first fold line extending left and right arranged above the opening line on the front panel and a tearable first cutting line that is convex upward and connects both ends of the first fold line; an adhesive plate adhered to the back surface of the front panel outside the folding piece; a slit arranged below the opening line on the front panel; and a locking portion provided on the folding piece that is inserted into the slit when the folding piece is folded at the first fold line to lock the folding piece.

[0008] Furthermore, the present invention is characterized in that in the packaging box of the above configuration, a top flap is provided connected to the upper end of the front panel, and the adhesive plate is folded back from the tip of the top flap and adhered to the back surface of the front panel.

[0009] Furthermore, the present invention is characterized in that in the packaging box having the above-mentioned configuration, a cut-and-raised piece surrounded by a cuttable U-shaped second cutting line and having a through-hole is provided on the top panel.

[0010] Furthermore, in the packaging box of the present invention having the above-described configuration, a cut-and-raised piece surrounded by a cuttable, downwardly convex, U-shaped cutting line and having a through hole is provided above the folded piece of the front panel.

[0011] Furthermore, in the packaging box of the present invention having the above-described structure, the locking portion is formed by a downwardly protruding notch provided on the folded piece.

[0012] Furthermore, in the packaging box of the present invention having the above-described structure, the adhesive plate protrudes below the opening line. [Effects of the Invention]

[0013] According to the present invention, the front panel with an adhesive plate adhered to its back surface has a fold-back piece that is inserted into the slit, so that the packaging box can be reliably kept closed when reclosed, thereby improving the convenience of the packaging box. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing a packaging box according to a first embodiment of the present invention; [Figure 2] FIG. 1 is a plan view showing a blank plate of a packaging box according to a first embodiment of the present invention; [Figure 3] FIG. 1 is a perspective view showing a state in which the packaging box of the first embodiment of the present invention is opened; [Figure 4] FIG. 1 is a perspective view showing a state in which the packaging box of the first embodiment of the present invention is reclosed; [Figure 5] FIG. 10 is a plan view showing a blank plate of a packaging box according to a second embodiment of the present invention; [Figure 6] FIG. 10 is a perspective view showing a packaging box according to a second embodiment of the present invention; [Figure 7] FIG. 10 is a perspective view showing a state in which the packaging box of the second embodiment of the present invention is reclosed. [Figure 8] Detailed view of part A in Figure 7 [Figure 9] FIG. 10 is a perspective view showing a packaging box according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] First Embodiment Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows a perspective view of a packaging box 1 of a first embodiment. The packaging box 1 is formed into a rectangular parallelepiped by folding a blank plate 50 (see Fig. 2), and is used to package contents such as confectionery, medicines, and sanitary products.

[0016] The packaging box 1 is formed into a substantially rectangular parallelepiped and includes a front panel 21, a rear panel 23 (see FIG. 2), side panels 22, 24 (see FIG. 2), a top panel 26, and a bottom panel 27 (see FIG. 2). The front panel 21 and the rear panel 23 face each other in the front-to-back direction (Y direction). The pair of side panels 22, 24 (see FIG. 2) face each other in the left-to-right direction (X direction) and connect the front panel 21 and the rear panel 23. The top panel 26 and the bottom panel 27 (see FIG. 2) face each other in the up-down direction (Z direction).

[0017] A hinge line 6 (see FIG. 2) consisting of a fold line extending left and right is formed on the rear panel 23. A tearable opening line 11 connecting both ends of the hinge line 6 is formed on the front panel 21 and the side panels 22, 24. The packaging box 1 is opened by cutting the opening line 11.

[0018] 2 shows a plan view of a blank plate 50 that forms the packaging box 1. The blank plate 50 is made of paper, and a paperboard such as coated cardboard can be used. The basis weight of the blank plate 50 is, for example, 200 to 450 g / m 2 The blank plate 50 may be formed from a resin sheet.

[0019] The blank plate 50 has a substantially rectangular front plate 21, side plate 22, rear plate 23, and side plate 24 that are connected in sequence in one direction via a folding line 5. An adhesive tab 25 is connected to the side of the front plate 21 opposite the side plate 22 via the folding line 5. The adhesive tab 25 is adhered to the side plate 24 when the packaging box 1 is assembled.

[0020] A top flap 32 and a connecting plate 33 are connected in this order above the front panel 21 via a fold line 5. An adhesive plate 34 is connected above the connecting plate 33 via a plurality of cuts 10 arranged side by side in the left-right direction. A plurality of cuts 10 are provided overlapping on the fold line 5 between the front panel 21 and the top flap 32 and on the fold line 5 between the top flap 32 and the connecting plate 33. A bottom flap 35 is connected below the front panel 21 via the fold line 5.

[0021] A top panel 26 and a bottom panel 27 are connected to the top and bottom of the rear panel 23 via fold lines 5. Side flaps 28 and 29 are connected to the top and bottom of the side panel 22 via fold lines 5, and side flaps 30 and 31 are connected to the top and bottom of the side panel 24 via fold lines 5.

[0022] A hinge line 6 consisting of a fold line extending in the left-right direction is provided at the top of the rear panel 23. A tearing line 11 connecting both ends of the hinge line 6 is formed on the front panel 21, the side panels 22, 24, and the adhesive strip 25. The tearing line 11 is formed by arranging multiple notches side by side so that it can be cut. The tearing line 11 on the front panel 21 is positioned below the hinge line 6 and extends in the left-right direction. The tearing lines 11 on the side panels 22, 24 and the adhesive strip 25 are connected to the hinge line 6 at an angle upward from the front side.

[0023] Above the opening line 11 on the front panel 21, a folded piece 36 is provided, surrounded by a fold line 7 (first fold line) and a cutting line 12 (first cutting line). The fold line 7 is formed to extend in the left-right direction. The cutting line 12 has multiple cuts arranged side by side to be cuttable, and is formed to be convex upward, connecting both ends of the fold line 7.

[0024] The folded piece 36 has a locking portion 37 formed by a downwardly protruding notch 13. Folding lines 8 extending outward in the left-right direction are provided on both sides of the locking portion 37. A slit 38 formed by a notch 14 is provided below the opening line 11 of the front panel 21.

[0025] In the blank plate 50 configured as described above, the top flap 32 is folded from the front plate 21, and the adhesive plate 34 is folded back together with the connecting plate 33 from the tip of the top flap 32. The adhesive plate 34 is further folded downward from the connecting plate 33 and adhered to the back surface of the front plate 21 on the outside of the folded-back piece 36. At this time, the adhesive plate 34 covers the entire back surface side of the folded-back piece 36.

[0026] Next, the adhesive strip 25 is adhered to the side panel 24 to form a cylindrical body, and the bottom of the cylindrical body is closed. That is, the bottom flap 35 folded from the front panel 21 is placed on top of the side flaps 29, 31 folded from the side panels 22, 24. The bottom panel 27 folded from the rear panel 23 is placed on and adhered to the bottom flap 35. In this way, a packaging box 1 is formed which is open at the top and closed at the bottom.

[0027] Next, contents are inserted from above into the packaging box 1 with its top open, and the top of the packaging box 1 is closed. That is, the top flap 32 folded from the front panel 21 is placed on top of the side flaps 28, 30 folded from the side panels 22, 24. The top panel 26 folded from the rear panel 23 is placed on and adhered to the top flap 32. In this way, the packaging box 1 shown in FIG. 1 is assembled.

[0028] As shown in Figure 3, packaging box 1 is opened by cutting opening line 11, and is separated into main body 2 below opening line 11 and lid 3 pivoted to main body 2 by hinge line 6. Lid 3 rotates around hinge line 6 as a fulcrum to open and close the top surface of main body 2.

[0029] 4 is a perspective view showing the state of packaging box 1 when it is reclosed. When reclosing, packaging box 1 is cut along cutting line 12 on front panel 21, and folding piece 36 is folded downward along folding line 7. Then, locking portion 37 is inserted into slit 38 to lock folding piece 36. This ensures that lid 3 remains closed. At this time, the opening on front panel 21 surrounded by cutting line 12 is closed by adhesive plate 34.

[0030] According to this embodiment, the folding piece 36 folded back from the front panel 21 having the adhesive plate 34 adhered to the back surface thereof has the locking portion 37 inserted into the slit 38, so that the packaging box 1 can be reliably maintained in a closed state when reclosed. Therefore, the convenience of the packaging box 1 can be improved.

[0031] In addition, adhesive plate 34 is folded back together with connecting plate 33 from the tip of top flap 32 connected to the upper end of front plate 21. Therefore, adhesive plate 34 that is adhered to the back surface of front plate 21 can be easily realized by one blank plate 50 that forms packaging box 1.

[0032] Furthermore, since the locking portion 37 is formed by the downwardly protruding notch 13, it is inserted upward into the slit 38 and engages with the slit 38. This makes it easy to realize the locking portion 37 that locks the folded piece 36. Note that the locking portion 37 may have other shapes, and for example, the locking portion 37 may be formed by an insertion piece that is inserted into the slit 38 from above.

[0033] Second Embodiment Next, Fig. 5 shows a plan view of a blank plate 50 forming a packaging box 1 of a second embodiment. For ease of explanation, the same parts as those of the first embodiment shown in Figs. 1 to 4 above are given the same reference numerals. The packaging box 1 of this embodiment has a cut-and-raised piece 39 on the top panel 26. The other parts are the same as those of the first embodiment.

[0034] The blank plate 50 has a side plate 22, a rear plate 23, a front plate 21, a side plate 24, and an adhesive strip 25 connected in sequence in one direction via a fold line 5. As in the first embodiment, a top flap 32, a connecting plate 33, and an adhesive strip 34 are connected above the front plate 21, and a bottom flap 35 is connected below it. A top plate 26 is connected above the rear plate 23, and a bottom plate 27 is connected below it. Side flaps 28 and 30 are connected above the side plates 22 and 24, and side flaps 29 and 31 are connected below them. In addition, a fold-back piece 36 and a slit 38 are provided in the front plate 21.

[0035] The front panel 21, the side panels 22, 24 and the adhesive strip 25 are provided with tear lines 11 that connect both ends of the hinge line 6. The tear line 11 on the front panel 21 is formed to be curved downwardly convexly.

[0036] A folding line 9 extending left and right is provided on the top panel 26. Both ends of the folding line 9 are connected by a cuttable U-shaped cutting line 15 (second cutting line), forming a cut-and-raised piece 39 surrounded by the cutting line 15. A through hole 40 is provided in the cut-and-raised piece 39.

[0037] The packaging box 1 shown in Figure 6 is assembled using the blank plate 50 configured as described above. Furthermore, as shown by the dashed line 39', the cutting line 15 is cut to cut and raise the cut-up piece 39. This allows the packaging box 1 to be displayed by inserting a display rod through the through-hole 40. At this time, the opening on the top panel 26 surrounded by the cutting line 15 is closed by the top flap 32.

[0038] In addition, the adhesive plate 34 protrudes downward on both sides below the opening line 11. As in the first embodiment, the packaging box 1 is opened by cutting the opening line 11. At this time, the front panel 21 is separated into an upper part 21a and a lower part 21b.

[0039] Figure 7 shows the packaging box 1 in a reclosed state. Figure 8 shows a detailed view of part A in Figure 7. When the packaging box 1 is reclosed, the folded-back piece 36 folded back along the fold line 7 is locked by inserting the locking portion 37 into the slit 38. Also, as shown in Figure 8, the adhesive plate 34 protrudes downward beyond the upper portion 21a of the front panel 21 and engages with the lower portion 21b. This makes it possible to more reliably hold the lid portion 3 closed.

[0040] According to this embodiment, similarly to the first embodiment, the packaging box 1 can be reliably maintained in a closed state when reclosed, and the convenience of the packaging box 1 can be improved.

[0041] Furthermore, the top panel 26 is provided with a cut-and-raised piece 39 surrounded by a cuttable U-shaped cutting line 15 (second cutting line) and having a through-hole 40, so that the packaging box 1 can be easily displayed.

[0042] Third Embodiment Next, Fig. 9 shows a plan view of a blank plate 50 forming a packaging box 1 of a third embodiment. For ease of explanation, the same parts as those of the first embodiment shown in Figs. 1 to 4 above are given the same reference numerals. The packaging box 1 of this embodiment has a cut-and-raised piece 39 on the front panel 21. The other parts are the same as those of the first embodiment.

[0043] A cut-and-raised piece 39 is provided above the folded piece 36 of the front panel 21 and is surrounded by a cut-and-raised cutting line 15 (second cut-and-raised line). The cut-and-raised piece 39 has a through-hole 40.

[0044] As shown by the dashed line 39', the cutting line 15 is cut to cut and raise the cut-up piece 39. This allows the packaging box 1 to be displayed by inserting a display rod into the through-hole 40. At this time, the opening on the front panel 21 surrounded by the cutting line 15 is closed by the adhesive plate 34. [Industrial Applicability]

[0045] The present invention can be used for a reclosable packaging box. [Explanation of symbols]

[0046] 1 packaging box 2 Main body 3 Lid 5, 7-9 fold lines 6 Hinge wire 10, 13, 14 Cutting 11 Opening Line 12 Cutting line (1st cutting line) 15 Cutting line (second cutting line) 21 Front plate 21a upper part 21b bottom 22, 24 Side plate 23 Rear plate 25 Glue allowance piece 26 Top plate 27 Bottom plate 28~31 Side flap 32 Top flap 33 Connecting plate 34 Adhesive board 35 Bottom flap 36 Folding piece 37 Locking part 38 Slit 39 Cut and raised piece 39' dash-dotted line 40 through holes 50 blank boards

Claims

1. a front panel facing the rear panel; a pair of left and right side panels connecting the front panel and the rear panel; a tearable opening line arranged on the front panel and the side panels connecting both ends of the hinge line; a folded piece surrounded by a first fold line extending left and right and arranged above the opening line on the front panel and a tearable first cutting line that is convex upward and connects both ends of the first fold line; an adhesive plate adhered to the back surface of the front panel; a slit arranged below the opening line on the front panel; and a locking portion provided on the folded piece that is inserted into the slit when the folded piece is folded at the first fold line to lock the folded piece.

2. 2. The packaging box according to claim 1, further comprising a top flap connected to the upper end of the front panel, and the adhesive plate is folded back from the tip of the top flap and adhered to the back surface of the front panel.

3. 3. The packaging box according to claim 2, wherein a cut-and-raised piece surrounded by a cuttable U-shaped second cutting line and having a through hole is provided on the top panel.

4. 3. The packaging box according to claim 1, wherein a cut-and-raised piece surrounded by a second cut line in a convex U-shape and having a through hole is provided above the folded piece of the front panel.

5. The packaging box according to any one of claims 1 to 4, wherein the locking portion is formed by a downwardly protruding notch provided on the folded piece.

6. The packaging box according to any one of claims 1 to 5, wherein the adhesive plate protrudes below the tear line.

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