Packing box

Abstract

To provide a packaging box whose surface sealed with an adhesive can be easily opened.SOLUTION: A packaging box 1 has at least one wall part formed of a pair of inner flaps 18 and 18 and a pair of outer flaps 17 and 17. In the pair of outer flaps 17 and 17, a zipper 20 for braking is formed over the pair of outer flaps 17 and 17. The zipper 20 extends along both tip edges 18a and 18b of the pair of inner flaps 18 and 18, and at least a part of the zipper 20 has a width astride both of the tip edges 18a and 18a.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] 2. Description of the Related Art Conventionally, there are packaging boxes that can be formed with an opening (opening) for taking out a contained item. An example of such a packaging box is disclosed in Patent Document 1.

[0003] In the packaging box of Patent Document 1, an opening opening is formed in the top plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-214402 A Summary of the Invention [Problem to be solved by the invention]

[0005] Meanwhile, as the uses of packaging boxes expand, diverse needs are emerging with regard to the surface forming the opening and the opening method. For example, in the packaging box of Patent Document 1, there is a need to be able to remove the contained items from the end face where the inner and outer flaps are sealed with an adhesive.

[0006] However, not only in the packaging box of Patent Document 1, but in general, surfaces sealed with adhesive, adhesive tape, or the like have the problem that they are difficult to open.

[0007] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to solve the above-mentioned problems and to provide a packaging box whose surface sealed with an adhesive or the like can be easily opened. [Means for solving the problem]

[0008] In order to solve the above problems, the packaging box of the present invention is a packaging box in which at least one wall portion is formed by a pair of inner flaps and a pair of outer flaps. A tear zipper is formed on the pair of outer flaps so as to span the pair of outer flaps. The zipper extends along both end edges of the pair of inner flaps, and at least a portion of the zipper has a width that spans both end edges. The outer flaps have a handle hole. and a tab portion which is the starting point for cutting open the zipper. is formed. A break guide line is formed on the ridge of the outer flap. The zipper has a pair of tear guide lines and a band-shaped region defined by the pair of tear guide lines. The band-shaped region is formed by dividing the pair of tear guide lines into the outer flap so that the pair of tear guide lines avoid the hand hole. The above Ridge The middle part in the extension direction It has a wide portion extending toward the The pair of breakage guide lines include an inner parallel portion that is continuous with an end of the knob portion and extends in parallel toward the ridge portion, an inclined portion that is continuous with an end of the inner parallel portion and expands in a tapered manner to the left and right toward the ridge portion so as to avoid the handle hole, and a wide parallel portion that is continuous with the end of the inclined portion and extends in parallel to be connected to the ridge portion. The breakage guide lines extend in the left and right directions of the ridge portion from a position where the end of the wide parallel portion is connected on the ridge portion as a starting point, and the left and right extending ends are located at left and right intermediate positions of the ridge portion.

[0009] In the packaging box of the present invention, the pair of outer flaps can be cut open with a tear-off zipper, and the leading edges of the pair of inner flaps can be exposed through the cut-open portions. Then, by hooking the leading edges of the exposed pair of inner flaps with fingers and pulling them open, the pair of outer flaps are each separated from the box, and the inner and outer flaps are opened together in a double-door state. This makes it easy to open the sides of the inner and outer flaps that are sealed with an adhesive or the like. In addition, the zipper can be formed while utilizing the wide portion to form a handle hole, which maintains the transportability and handling properties of the packaging box. Also, by making the portion other than the wide portion narrower, the zipper can be formed while appropriately avoiding the area where adhesive is applied, making it easier to break the zipper. In addition, a break guide line is formed on the ridge of the outer flap, which makes it easier to cut open the outer flap and improves the ease of opening the sealing surface.

[0010] It is also preferable that a finger insertion portion for opening is formed between both leading edges of the pair of inner flaps or at the leading end of at least one of the pair of inner flaps.

[0011] In this configuration, the inner flap and the outer flap can be pulled open by placing fingers in the finger insertion section, making the opening operation easy.

[0012] In addition, when the wall portion is a wraparound type packaging box consisting of upper, lower, left and right side panels, it is preferable that the pair of inner flaps are connected to the left and right side panels, and the pair of outer flaps are connected to the upper and lower side panels.

[0013] In this way, by applying the present invention to a wraparound type packaging box, the effect of the present invention, that is, the sealing surface can be easily opened, can be more suitably enjoyed.

[0014] Also, The wide portion is Of the pair of outer flaps, the upper The above On the outer flap Leave Expands to the left and right S It is preferable that

[0015] By configuring in this way, On the upper outer flap Zipper formation and wide section handling hole This allows the packaging box to be transported and handled easily. In addition, by narrowing the width of the portion other than the wide portion, the zipper can be formed while preferably avoiding the area where the adhesive is applied, so that the zipper can be easily broken. Effect of the Invention

[0018] According to the packaging box of the present invention, the surface sealed with adhesive or the like can be easily opened. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a packaging box according to a first embodiment of the present invention, viewed from the upper front left. [Diagram 2] FIG. 1 is a plan view showing a blank sheet for a packaging box according to a first embodiment of the present invention. [Diagram 3] FIG. 1 is a front view showing a packaging box according to a first embodiment of the present invention. [Figure 4]FIG. 2 is a perspective view illustrating a state in which the packaging box according to the first embodiment of the present invention is placed with its front end face facing up, for explaining a procedure for opening the packaging box. [Diagram 5] FIG. 2 is a perspective view illustrating a state in which the upper and lower zippers have been cut open, illustrating the procedure for opening the packaging box according to the first embodiment of the present invention. [Figure 6] FIG. 2 is a diagram for explaining the procedure for opening the packaging box according to the first embodiment of the present invention, and is a perspective view showing the state in which the outer flap has been cut open by a zipper and the inner flap are opened together. [Figure 7] FIG. 6 is a front view showing a packaging box according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a plan view showing a blank sheet for a packaging box according to a second embodiment of the present invention. [Figure 9] FIG. 11 is a perspective view illustrating a state in which the upper and lower zippers have been cut open, illustrating the procedure for opening the packaging box according to the second embodiment of the present invention. [Figure 10] FIG. 11 is a plan view showing a blank sheet for a packaging box according to a third embodiment of the present invention. [Figure 11] FIG. 11 is a plan view showing a blank sheet for a packaging box according to a fourth embodiment of the present invention. [Figure 12] FIG. 11 is a perspective view showing a state in which the front and rear of the top plate of the packaging box according to the fourth embodiment of the present invention are partially opened. [Figure 13] 13(a) and (b) are front views showing other configurations of the finger insertion portion of the inner flap. [Figure 14] FIG. 11 is a perspective view showing a modified example of the packaging box according to the first embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following embodiments, the same reference numerals are used to designate the same parts, and the same description will be omitted. In the following description, the directions of front, back, left, right, top and bottom are set for the convenience of describing the packaging box, and do not limit the configuration of the packaging box.

[0021] (First embodiment) As shown in Fig. 1, the packaging box 1 of this embodiment is a wrap-around rectangular box. The packaging box 1 has, as walls, a bottom plate 10, a pair of front and rear end plates 11, 12, a pair of left and right side plates 13, 14, and a top plate 15. The items contained in the packaging box 1 are not limited, but for example, multiple plastic bottles can be contained as the items.

[0022] The packaging box 1 is formed by mountain-folding or valley-folding a blank sheet S cut out from a single sheet of cardboard at each line, as shown in Fig. 2. The blank sheet S shown in Fig. 2 is arranged so that the outer surface is visible. Each crease (fold line) of the blank sheet S is a linear groove (crease) formed by pressing into the surface of the blank sheet S. Note that cuts (half-cut lines, etc.) may be formed in the creases. This makes it easier to fold the blank sheet S at the creases.

[0023] The bottom plate 10 is a rectangular flat plate as shown in Fig. 1. A left side plate 13 is connected to the left edge of the bottom plate 10 via a crease, and a right side plate 14 is connected to the right edge of the bottom plate 10 via a crease. The left side plate 13 and the right side plate 14 are the same rectangular flat plate and are formed perpendicular to the bottom plate 10.

[0024] A top plate 15 is connected to the upper edge of the right side plate 14 via a crease. The top plate 15 is a flat rectangular plate like the bottom plate 10, and is formed perpendicular to the right side plate 14. A joint piece 16 is connected to the left edge of the top plate 15 via a crease. The joint piece 16 is a strip-shaped plate formed along the left edge of the top plate 15. The blank sheet S (see Figure 2) is folded at each of the lines, and a joining piece 16 connected to the left edge of the top plate 15 is joined to the outer surface of the upper part of the left side plate 13, so that the left side plate 13, bottom plate 10, right side plate 14 and top plate 15 are formed into a rectangular tube shape.

[0025] The front end plate 11 has a pair of upper and lower outer flaps 17, 17 connected to the front edges of the top plate 15 and the bottom plate 10, respectively, and a pair of left and right inner flaps 18, 18 connected to the front edges of the left side plate 13 and the right side plate 14, respectively. The upper and lower outer flaps 17, 17 are overlapped on the outer surfaces of the left and right inner flaps 18, 18 and are bonded together with an adhesive.

[0026] The upper and lower outer flaps 17, 17 are arranged with their leading edges 17a, 17a butted against each other in the up-down direction. The upper outer flap 17 is formed with a cut line L25 (see FIG. 3) that forms a handle hole 25. Meanwhile, the left and right inner flaps 18, 18 are arranged with a gap between them in the left-right direction, with the leading edges 18a, 18a not butting against each other. As a result, a slit-like finger insertion section 19 (see FIG. 3) extending in the up-down direction is formed between the leading edges 18a, 18a of the left and right inner flaps 18, 18. The finger insertion section 19 has a gap large enough to insert the thumb. 2, the left and right inner flaps 18, 18 have cut pieces 18c, 18c partitioned by arc-shaped cuts 18b, 18b, formed at positions corresponding to the hand hole 25 of the upper outer flap 17. The cut pieces 18c, 18c are cut open by fingers inserted into the hand hole 25.

[0027] The upper and lower outer flaps 17, 17 are formed with a zipper 20 for opening in the vertical direction. The zipper 20 extends in a strip shape in the vertical direction at the center in the left-right direction of the front end plate 11, and extends along both tip edges 18a, 18a of the pair of inner flaps 18, 18 as shown in Figs. 1 and 3. The zipper 20 functions as a tear strip that divides the upper and lower outer flaps 17, 17 into left and right halves. The zipper 20 in this embodiment is formed continuously from the base edge (edge ​​on the bottom plate 10 side) of one outer flap 17 to the base edge (edge ​​on the top plate 15 side) of the other outer flap 17.

[0028] As shown in FIG. 3, the zipper 20 includes a pair of cutting guide lines L21, L21 formed by perforated cuts, and a band-shaped region 20a defined by the pair of cutting guide lines L21, L21. In the upper outer flap 17, the pair of cutting guide lines L21, L21 have inner parallel portions L22, L22 and outer parallel portions L23, L23 formed outside the inner parallel portions L22, L22 in the left-right direction. The inner parallel portions L22 and the outer parallel portions L23 are parallel to the leading edge 18a of the inner flap 18. In addition, in the lower outer flap 17, the pair of cutting guide lines L21, L21 only have inner parallel portions L22, L22.

[0029] The inner parallel portions L22, L22 have a width W1 that spans both leading edges 18a, 18a of the pair of inner flaps 18, 18. That is, the width W1 of the inner parallel portions L22, L22 (the minimum width W1 of the band-shaped region 20a) is set to be larger than the distance between the leading edges 18a, 18a. The width W1 of the inner parallel portions L22, L22 may be set to be the same as the distance between the leading edges 18a, 18a.

[0030] The outer parallel portions L23, L23 are formed on the upper outer flap 17 so as to continue to the upper ends of the inner parallel portions L22, L22, and extend upward to avoid the handhold hole 25. The outer parallel portions L23, L23 include inclined portions L23a, L23a tapered upward and wide parallel portions L23b, L23b extending parallel to the upper ends of the inclined portions L23a, L23a. The upper ends of the wide parallel portions L23b, L23b are connected to the upper edge (ridge) of the front end plate 11.

[0031] The upper edge (ridge) of the front end plate 11 is formed with breakage guiding lines L30, L30 consisting of perforated cuts. The breakage guiding lines L30, L30 are continuous with the upper ends of the wide parallel parts L23b, L23b and extend to both the left and right sides along the upper edge (ridge). The left and right extending ends of the breakage guiding lines L30, L30 are located in the left and right middle parts of the upper edge (ridge). As a result, there are areas in the left and right shoulder parts 11a, 11a of the upper edge (ridge) of the front end plate 11 where the breakage guiding lines L30, L30 do not exist. In other words, the breakage guiding lines L30, L30 are not formed over the entire upper edge that is broken when opened.

[0032] Similarly, a pair of left and right break guide lines L30, L30 consisting of perforated cuts are formed on the lower edge (ridge line) of the front end plate 11. The break guide lines L30, L30 on the lower edge continue to the lower end of the inner parallel parts L22, L22 and extend to the left and right middle parts of the lower edge (ridge line). As a result, there are areas on both left and right sides 11b, 11b of the lower edge (ridge line) of the front end plate 11 where the break guide lines L30, L30 do not exist. In other words, the break guide lines L30, L30 are not formed over the entire lower edge that breaks when opened.

[0033] The leading edges 17a, 17a of the upper and lower outer flaps 17, 17 are formed with tabs 27, 27 which serve as starting points for cutting and opening the zipper 20. The tabs 27, 27 can be bent along lines L26, L26 and can be easily grasped with fingers.

[0034] The rear end plate 12 has a similar configuration to the front end plate 11. Like the front end plate 11, the rear end plate 12 is formed with a zipper 20 including a pair of cutting guide lines L21, L21 and a band-shaped region 20a.

[0035] Next, the function of the zipper 20 when opening the packaging box 1 will be described with reference to Figures 4 to 6. Below, a case where the front end plate 11 of the packaging box 1 is opened will be illustrated as an example. First, in order to make it easier to open the front end plate 11, the packaging box 1 is placed so that the front end plate 11 faces upward as shown in FIG. When opening the zipper 20, each tab 27 is picked up with the fingers, raised, and pulled in the extension direction of the zipper 20. That is, in Fig. 4, the zipper 20 is pulled leftward in the left outer flap 17, and the zipper 20 is pulled rightward in the right outer flap 17. This causes tears to form along the pair of tear guide lines L21, and the band-shaped regions 20a begin to separate in the extension direction.

[0036] 5, in the upper outer flap 17, a tear extends from the inner parallel portions L22, L22 to the outer parallel portions L23, L23, and the zipper 20 is cut open to the upper edge of the front end plate 11. In addition, in the lower outer flap 17, a tear extends along the inner parallel portions L22, L22, and the zipper 20 is cut open to the lower edge of the front end plate 11. When the zipper 20 is cut open in this manner, the leading edges 18a, 18a of the inner flaps 18, 18 are exposed through the opening.

[0037] Then, insert your fingers into the finger insertion portion 19 that appears between the leading edges 18a, 18a of the inner flaps 18, 18, grab the leading ends of the inner flaps 18, 18 with your fingers, and pull the inner flaps 18, 18 and the outer flaps 17, 17 together to the left and right. Then, the cut-open outer flaps 17, 17 are cut off from the front edges of the top plate 15 and the bottom plate 10, respectively, with the breakage guide lines L30, L30 at the upper and lower edges as the starting points for cutting, and the inner flaps 18, 18 and the cut-open outer flaps 17, 17 are opened together in a double door state, as shown in Figure 6.

[0038] This allows the surface where the inner flaps 18, 18 and the outer flaps 17, 17 are sealed with an adhesive or the like to be easily opened.

[0039] According to the packaging box 1 of the present embodiment described above, the front end plate 11 can be opened in a double-door state by cutting open the zipper 20 and pulling open the exposed end edges 18a, 18a of the pair of inner flaps 18, 18 with fingers. This makes it possible to easily open the front end plate 11 in which the inner flap 18 and the outer flap 17 are sealed with an adhesive.

[0040] In addition, the front end plate 11 can be opened by inserting fingers into the finger insertion portion 19, making the opening operation easy.

[0041] Furthermore, by applying this embodiment to a wrap-around type packaging box 1, the surface sealed with adhesive or the like can be easily opened.

[0042] Furthermore, the zipper 20 formed on the upper outer flap 17 has a wide portion that extends laterally beyond the area sandwiched between the inner parallel portions L22, L22, and the handle hole 25 is formed in the wide portion, so that the convenience of the handle hole 25 is not compromised even while the zipper 20 is formed. This maintains the transportability and handleability of the packaging box 1. Furthermore, by making the portions other than the wide portion narrow (the inner parallel portions L22, L22), the zipper 20 can be formed while suitably avoiding the area where adhesive is applied (for example, the area to the side of the zipper 20), so that the zipper 20 is easily broken.

[0043] Furthermore, since the breakage guide lines L30, L30 are formed on the upper and lower edges of the front end plate 11, the operation of cutting open the front end plate 11 becomes easier, improving the ease of opening the sealing surface.

[0044] Second embodiment A packaging box according to a second embodiment will be described with reference to Figures 7 to 9. The packaging box 1 according to the second embodiment differs from the packaging box 1 according to the first embodiment in that the zipper 20 formed on the upper outer flap 17 does not have an inner parallel portion (see Figure 3, L22, L22) and an outer parallel portion (see Figure 3, L23, L23).

[0045] 7 and 8, in the upper outer flap 17, the pair of cutting guide lines L21, L21 are formed only by inclined portions L23a, L23a continuing to the knob portion 27. The upper ends of the inclined portions L23a, L23a do not reach the upper edge of the front end plate 11, but only extend to a position spaced downward from the upper edge of the front end plate 11. As a result, the front end plate 11 has a space S1 below the upper edge where the cutting guide lines L21, L21 are not formed.

[0046] When opening the zipper 20 in the upper outer flap 17, the zipper 20 is pulled forcefully in the extending direction. This causes a tear to extend from the tab 27 to the inclined portions L23a, L23a, and then the tear reaches the upper edge of the front end plate 11 across the space S1 from the upper ends of the inclined portions L23a, L23a. This causes the upper zipper 20 to open (see FIG. 9). Furthermore, if the flutes (also called "steps") of the outer flap 17 extend in the vertical direction, a vertical tear spanning the space S1 will be formed smoothly, further improving the ease of opening.

[0047] In the packaging box 1 of this embodiment, in addition to the effects described in the first embodiment, the front end plate 11 (rear end plate 12) has a space S1 below the upper edge where the cutting guide line L21 is not formed, thereby improving the strength. In other words, the packaging box 1 obtained has excellent strength when stacked and strength when dropped.

[0048] Third embodiment A packaging box according to a third embodiment will be described with reference to Fig. 10. The packaging box 1 according to the third embodiment differs from the packaging box 1 according to the first embodiment in that outer parallel portions L23, L23 are also formed on the zipper 20 of the lower outer flap 17.

[0049] As shown in FIG. 10, the pair of tear guide lines L21, L21 of the lower zipper 20 are vertically symmetrical to the pair of tear guide lines L21, L21 of the upper zipper 20, and have inner parallel portions L22, L22 and outer parallel portions L23, L23.

[0050] To open the lower zipper 20, the tab 27 is pinched with the fingers and pulled downward in the same manner as described above, causing a tear to extend from the inner parallel portions L22, L22 through the outer parallel portions L23, L23 to the lower edge of the front end plate 11, and the zipper 20 is cut open.

[0051] According to the packaging box 1 of this embodiment, the zipper 20 has outer parallel portions L23, L23 in the lower outer flap 17, and the total length of the slit is long, so that the packaging box 1 has superior openability compared to the packaging box 1 of the first embodiment.

[0052] (Fourth embodiment) A packaging box according to a fourth embodiment will be described with reference to Figures 11 and 12. The packaging box 1A according to the fourth embodiment is provided with an opening means also on the top plate 15. The packaging box 1A is suitable for use as an inner box to be housed in an outer box (not shown).

[0053] The top plate 15 has, as opening means, rising pieces 52, 52 provided at both front and rear ends, and a middle portion 54 sandwiched between the rising pieces 52, 52. The top plate 15 is formed with front and rear hand holes 51, 51 and opening start holes 53, 53.

[0054] The handle holes 51 are through holes formed when the packaging box 1A is opened from above. The handle holes 51 are formed in the rising pieces 52, 52 at both the left and right ends of the top plate 15. Each of the handle holes 51, 51 is disposed in the middle of the top plate 15 in the left-right direction. Each of the handle holes 51, 51 has an elongated hole shape that allows the fingers from the index finger to the little finger to be inserted, and is closed by a folded piece 55, 55, respectively.

[0055] As shown in Fig. 12, the rising pieces 52, 52 are used to cut and raise both front and rear ends of the top plate 15 to open the package. The rising pieces 52, 52 and the middle portion 54 are partitioned by cutting guide lines L52, L52. The middle portion 54 can be opened by dividing it into left and right portions by a front-rear cutting guide line L54 formed near the right edge of the top plate 15. A middle portion handle hole 54b is formed in the center of the front-rear cutting guide line L54 in the front-rear direction. The middle portion handle hole 54b is closed by a folded piece 54c.

[0056] When removing the packaging box 1A of this embodiment from an outer box (not shown), both hands are inserted into the handle holes 51, 51 on both the left and right sides and pulled up. Then, the rising pieces 52, 52 are cut off from the middle part 54 by the cutting guide lines L52, L52 and rise up, so that the packaging box 1A can be removed from the outer box by grasping and pulling up the rising pieces 52, 52 as they are.

[0057] 12, the rising pieces 52, 52 are continuously connected to the front end plate 11 and the rear end plate 12 through areas where the fracture guiding lines L30, L30 do not exist on the left and right shoulder portions 11a, 11a of the front end plate 11 and the rear end plate 12. This prevents the rising pieces 52, 52 from being cut off from the upper edges (ridges) of the front end plate 11 and the rear end plate 12 when the packaging box 1A is removed or transported.

[0058] In the packaging box 1A of this embodiment, in addition to being able to remove the contained items by cutting open the front end plate 11 and the rear end plate 12, the contained items can also be removed by using the opening formed by raising the rising pieces 52, 52 or the opening formed by cutting open the middle portion 54.

[0059] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be modified appropriately without departing from the spirit of the present invention. For example, as shown in Figures 13(a) and 13(b), the leading edges 18a, 18a of the inner flaps 18, 18 may be butted against each other. In this case, as shown in Figure 13(a), semicircular (arc-shaped) notches 18d, 18d may be formed in the leading ends of the inner flaps 18, 18 to form the finger insertion section 19. In this case, the notch 18d may be formed in only one of the inner flaps 18. Also, as shown in Figure 13(b), the finger insertion section 19 may be formed by forming two upper and lower cut lines 18e, 18e that serve as starting points for opening.

[0060] As shown in FIG. 14, the leading edges 17a, 17a of the outer flaps 17, 17 may be spaced apart from each other without being butted together. Furthermore, the width W1 of the inner parallel portions L22, L22 may be set to be slightly smaller than the distance between the two tip edges 18a, 18a.

[0061] In addition, in each of the above embodiments, the present invention is applied to wrap-around type packaging boxes 1, 1A, but this is not limited to this, and the present invention may also be applied to a so-called A-type packaging box in which the top plate and bottom plate are formed by a pair of inner flaps and a pair of outer flaps.

[0062] Further, the blank sheet S of the packaging box 1, 1A in the above-mentioned embodiment is made of corrugated cardboard, but the blank sheet may be made of various known paperboards. [Explanation of symbols]

[0063] 1 packaging box 1A packaging box 17 Outer flap 17a Tip edge 18 Inner flap 18a Tip edge 19 Finger insertion section 20 Zipper L23 Outer parallel part L30 Break-inducing wire

Claims

1. A packaging box in which at least one wall portion is formed by a pair of inner flaps and a pair of outer flaps, A tear zipper is formed in the pair of outer flaps so as to extend across the pair of outer flaps, The zipper extends along both end edges of the pair of inner flaps, and at least a portion of the zipper has a width spanning both end edges, The outer flap is formed with a handle hole and a tab portion which is a starting point for cutting open the zipper, A fracture guide line is formed on the ridge of the outer flap, The zipper includes a pair of tear guide lines and a band-shaped region defined by the pair of tear guide lines, the band-shaped region has a wide portion extending toward a middle portion of the ridge portion of the outer flap in an extending direction so that the pair of cutting guide lines avoid the hand hole; The pair of cutting guide wires are an inner parallel portion that is continuous with an end portion of the knob portion and extends parallel to the ridge portion; an inclined portion forming the wide portion, the inclined portion being continuous with an end of the inner parallel portion, tapering to the left and right toward the ridge portion, and extending to avoid the hand hole; a wide parallel portion that is continuous with an end of the inclined portion and extends parallel to the ridge portion so as to be connected to the ridge portion, The break induction line starts from a portion of the ridge line where the ends of the wide parallel portion are connected, extends in the left-right direction of the ridge line, and has left and right extending ends located at left and right intermediate portions of the ridge line.

2. 2. The packaging box according to claim 1, wherein a finger insertion portion for opening is formed between both leading edges of the pair of inner flaps or at the leading end of at least one of the pair of inner flaps.

3. The packaging box according to claim 1 or 2, characterized in that the wall portion of the packaging box is a wraparound type packaging box consisting of upper, lower, left, and right side panels, and the pair of inner flaps are connected to the left and right side panels, and the pair of outer flaps are connected to the upper and lower side panels.

4. 4. The packaging box according to claim 3, wherein the wide portion is wider laterally at an upper outer flap of the pair of outer flaps.

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