Packing box

Abstract

To provide packing boxes that are easy to cut and open a horizontal cutting guide line.SOLUTION: In a packing box 1A according to the present invention, a horizontal cutting guide line L10A is formed on a body portion 10, and slits are formed intermittently on the horizontal cutting guide line L10A. The horizontal cutting guide line L10A has a wavy section L20 formed by repeating a convex part L21 bent to protrude toward a top plate 20 side and a concave part L22 bent to protrude toward a bottom plate 30 side with respect to a virtual straight line L2 extending in the horizontal direction.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 Some corrugated cardboard packaging boxes have perforations along the entire circumference of the body, and an opening start portion is provided on the body (see, for example, Patent Document 1). When opening the above-mentioned packaging box, the opening start part is pushed into the inside of the body part to form an opening in the body part, and a hand is inserted into the opening and the upper part of the body part is pulled up, thereby cutting open the transverse cutting guide line and separating the body part into upper and lower parts. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3208228 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional packaging box, the transverse cutting guide line is formed in a straight line, and therefore there is a problem that it is difficult to cut open the transverse cutting guide line. An object of the present invention is to solve the above-mentioned problems and to provide a packaging box in which the transverse cutting guide line can be easily cut open. [Means for solving the problem]

[0005] In order to solve the above problems, the present invention provides a packaging box comprising a body formed into a cylindrical shape by a wall body, a top plate provided at an upper opening of the body, and a bottom plate provided at a lower opening of the body. A transverse cutting guide line extending in a transverse direction is formed in the body, and slits are formed intermittently in the transverse cutting guide line. At least a part of the transverse cutting guide line is formed with a wavy section in which a convex portion bent to protrude toward the top plate side and a concave portion bent to protrude toward the bottom plate side are repeated with respect to an imaginary straight line extending in the transverse direction.

[0006] The transverse cutting guide line of the present invention is a cutting boundary line that is cut when the packaging box is opened, and is composed of a plurality of slits and an area between adjacent slits. The shape of the transverse cutting guide line of the present invention corresponds to the shape of the cutting edge formed when the transverse cutting guide line is cut open.

[0007] In the packaging box of the present invention, the wavy section of the transverse tear guide line can be easily cut open, and after opening, a wavy cut edge is formed at the edge of the opening, which provides a soft feel when touched with the hand. In the present invention, since the transverse cutting induction lines in the wavy sections intersect with the imaginary straight lines, even if the transverse cutting induction lines in the wavy sections are shifted in the direction intersecting with the imaginary straight lines due to manufacturing errors, this often falls within the tolerance range. When cutting guide lines are formed on a blank sheet using the rotary die cutter of a box-making machine, the cutting guide lines tend to deviate slightly from the correct position. However, the packaging box of the present invention can tolerate deviations in the position of the horizontal cutting guide lines, making it suitable for production using a rotary die cutter. In addition, in the packaging box of the present invention, a wavy edge is formed on the edge of the opening after opening, so that the appearance after opening is distinctive and easily catches the consumer's eye.

[0008] In the present invention, the length of the transverse cutting guide line is not limited, and for example, the transverse cutting guide line may be formed around the entire circumference of the body part. Also, a cutting guide line may be formed extending laterally at a distance above and below the transverse cutting guide line, forming an opening strip (zipper) on the body part.

[0009] In the above-mentioned packaging box, if the maximum width of the convex portion in the horizontal direction (the length of the straight line connecting both ends of the convex portion) is set to be between 2 and 15 times the maximum height of the convex portion from the imaginary line (the maximum distance between the imaginary line and the convex portion) and the convex portion is formed large in the horizontal direction, the convex portion can be easily cut in the horizontal direction, so that the horizontal cutting guide line can be smoothly cut open.

[0010] In the above-mentioned packaging box, by forming the maximum horizontal width of the convex portion larger than the maximum horizontal width of the concave portion and increasing the area of ​​the convex portion at the wavy cut edge formed at the opening edge after opening, the opening edge feels softer when touched with the hand after opening.

[0011] In the packaging box described above, by arranging the adjacent slits so that they do not overlap in the horizontal direction, the horizontal cutting guide line can be smoothly cut open in the horizontal direction.

[0012] In the above-mentioned packaging box, the imaginary straight line may be formed on a folded line between the wall body and the top plate. In this case, in the section where the transverse cutting guiding line intersects with the folded line, if the slit is moved away from the folded line, it is possible to prevent the cutting direction from changing on the folded line when the transverse cutting guiding line is cut open. In addition, in the section where the transverse cutting guiding line intersects the folded line, if the slit is made to intersect the folded line, the transverse cutting guiding line can be cut open smoothly across the folded line.

[0013] In the above-mentioned packaging box, the wavy section may have a corner section that is in contact with a corner formed by the adjacent walls. In this case, it is preferable to form the lateral width of the pair of the protrusions and the recesses in the corner section smaller than the lateral width of the pair of the protrusions and the recesses in the section other than the corner section. With this configuration, when the adjacent walls are bent to form corners during box making, the horizontal cutting guide line is less likely to be cut open at the corners.

[0014] When an opening start portion is formed in the transverse cutting guide line, it is preferable to form a linear connection section between the opening start portion and the wavy section. In this configuration, the transverse cutting guide line can be smoothly cut open from the opening start portion toward the wavy section. Furthermore, when an upper slit extending toward the top plate and a lower slit extending toward the bottom plate are connected to the notch in the connection section, it is acceptable for the connection section to be slightly misaligned from the correct position when a transverse cutting guide line is formed in the blank sheet. Effect of the Invention

[0015] In the packaging box of the present invention, the wavy section of the transverse tear guide line is easy to cut open, and since a wavy edge is formed at the edge of the opening after opening, the feel of the edge of the opening when touched by the hand is softened, and the appearance of the edge of the opening is distinctive. In addition, in the present invention, manufacturing errors can be tolerated when the transverse tear guide line is formed on the blank sheet. [Brief description of the drawings]

[0016] [Figure 1] 1 is a perspective view of a packaging box according to a first embodiment of the present invention, viewed from the upper left front side. FIG. [Diagram 2] 1 is a diagram showing a blank sheet for a packaging box according to a first embodiment of the present invention. FIG. [Diagram 3] 4 is a partial enlarged view showing a wavy section of a horizontal cutting guide line in a blank sheet of a packaging box according to the first embodiment of the present invention. FIG. [Figure 4] 4 is a partially enlarged view showing an opening start portion and a connection section of a horizontal cutting guide line in a blank sheet of a packaging box according to the first embodiment of the present invention. FIG. [Diagram 5] 1 is a perspective view showing a state after the packaging box according to the first embodiment of the present invention has been opened. FIG. [Figure 6] FIG. 11 is a diagram showing a blank sheet for a packaging box according to a second embodiment of the present invention. [Figure 7]FIG. 11 is a partially enlarged view showing a wavy section of a horizontal cutting guide line in a blank sheet of a packaging box according to a second embodiment of the present invention. [Figure 8] FIG. 11 is a diagram showing a blank sheet for a packaging box according to a third embodiment of the present invention. [Figure 9] FIG. 11 is a partially enlarged view showing a wavy section of a horizontal cutting guide line in a blank sheet of a packaging box according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] 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 description of each embodiment, the same components are denoted by the same reference numerals, and duplicate descriptions will be omitted. In the following description, the front, rear, left and right directions are set for the convenience of describing the packaging box of this embodiment, and do not limit the configuration or usage state of the packaging box of the present invention.

[0018] [First embodiment] 1, the packaging box 1A of the first embodiment includes a cylindrical body 10, a top plate 20 provided at an upper opening of the body 10, and a bottom plate 30 provided at a lower opening of the body 10. The packaging box 1A of the first embodiment is an A-type cardboard box.

[0019] The packaging box 1A of the first embodiment is formed by mountain-folding or valley-folding a blank sheet S1 cut out from a cardboard sheet at each fold line, as shown in Fig. 2. The blank sheet S1 shown in Fig. 2 is arranged so that the inner side is visible. The fold lines of the blank sheet S1 are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S1. Note that the creases may be formed with intermittent cuts. In this way, it becomes easier to fold the blank sheet S1 at the creases. Alternatively, the folded line may be formed by forming a half-cut slit only on the surface of the sheet or a slit penetrating the sheet in an intermittent linear fashion.

[0020] 1, the body 10 has a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12. The end wall 11 and the side wall 12 are formed in a rectangular shape. The end wall 11 and the side wall 12 are the "walls" in the claims. In the first embodiment, a band-shaped joint piece 13 is provided continuously at the rear edge portion of the right side wall 12 (see FIG. 2). The joint piece 13 is attached to the inner surface of the end wall 11 on the rear side.

[0021] When the blank sheet S1 (see Figure 2) is folded along each fold line and the joining piece 13 is joined to the inner surface of the rear end wall 11, the front and rear end walls 11, 11 and the left and right side walls 12, 12 form a cylindrical body 10 that is rectangular in plan view.

[0022] The top plate 20 includes a pair of front and rear inner flaps 21, 21 connected to the upper edges of the front and rear end walls 11, 11 via a fold line L1, and a pair of left and right outer flaps 22, 22 connected to the upper edges of the left and right side walls 12, 12 via a fold line L1 (see FIG. 2). The top plate 20 is formed by overlapping the two outer flaps 22, 22 on the upper surfaces of the two inner flaps 21, 21.

[0023] The bottom plate 30 includes a pair of front and rear inner flaps 31, 31 connected to the lower edges of the front and rear end walls 11, 11 via fold lines, and a pair of left and right outer flaps 32, 32 connected to the lower edges of the left and right side walls 12, 12 (see FIG. 2). The bottom plate 30 is formed by overlapping the two outer flaps 32, 32 on the lower surfaces of the two inner flaps 31, 31.

[0024] A transverse cutting guide line L10A is formed on the upper edge of the trunk portion 10. The transverse cutting guide line L10A extends in the transverse direction and is formed around the entire circumference of the trunk portion 10 (see FIG. 2). The horizontal cutting guide line L10A is a cutting boundary line that is cut when the top plate 20 is separated from the body portion 10 when opening the packaging box 1A (see FIG. 5). As shown in FIG. 3, the horizontal cutting guide line L10A is a perforation formed by a plurality of slits K and linear connecting regions between adjacent slits K,K. The shape of the horizontal cutting guide line L10A coincides with the shape of the cut edge formed when the horizontal cutting guide line L10A is cut open (see FIG. 5).

[0025] As shown in Fig. 2, the horizontal cutting guide line L10A is divided into a wavy section L20, an opening start portion 50, and a connection section L60. The horizontal cutting guide line L10A of the wavy section L20 and the connection section L60 is formed along a virtual straight line L2 set at the upper edge of the body portion 10 (see Fig. 1). In the first embodiment, the imaginary straight line L2 is set on a folded line L1 formed on the upper edge portions of the end wall 11 and the side wall 12.

[0026] The opening start portion 50 is formed in the left-right center of the front end wall 11 as shown in Fig. 1. The opening start portion 50 is an area surrounded by a cutting guide line L50 as shown in Fig. 4. The cutting guide line L50 is a perforation formed by discontinuously forming slits, and extends from an end of the horizontal cutting guide line L10A of one connection section L60 to an end of the horizontal cutting guide line L10A of the other connection section L60. The opening start portion 50 extends downward from the upper edge of the end wall 11. The opening start portion 50 has a narrowed shape at the middle in the vertical direction. The upper portion of the opening start portion 50 has a width in the left-right direction that increases toward the top.

[0027] In the wavy section L20, as shown in FIG. 2, transverse cutting guide lines L10A are formed at the upper edge of the left side wall 12, the upper edge of the rear end wall 11, and the upper edge of the right side wall 12. As shown in FIG. 3, the horizontal cutting guide lines L10A of the wavy section L20 are formed in a wavy linear shape by repeatedly forming convex portions L21 and concave portions L22 in the horizontal direction (the extension direction of the imaginary straight line L2). The convex portion L21 is bent relative to the fold line L1 (virtual straight line L2) so as to protrude toward the top plate 20 (the outer flap 22). The concave portion L22 is bent relative to the fold line L1 (virtual straight line L2) so as to protrude toward the bottom plate 30 (the side wall 12). The boundary between the convex portion L21 and the concave portion L22 is the intersection of the fold line L1 and the transverse cutting guide line L10A.

[0028] In the wavy section L20, adjacent slits K, K are arranged so as not to overlap in the horizontal direction (the extension direction of the virtual straight line L2). In addition, in the section where the horizontal cutting guide line L10A of the wavy section L20 intersects with the broken line L1, the slit K is away from the broken line L1, does not intersect with the broken line L1, and is not connected to the broken line L1. The slits K formed in the convex portions L21 of the wavy section L20 are formed in a curved shape. Moreover, the slits K formed in the concave portions L22 of the wavy section L20 are formed in a straight line, but may be formed in a curved shape.

[0029] The horizontal cutting guide line L10A of the wavy section L20 is divided into a corner section L30 that is adjacent to the corner formed by the adjacent end wall 11 and side wall 12, and an intermediate section L40 that is formed between the two corner sections L30, L30.

[0030] In the lateral cutting guide line L10A of the intermediate section L40, as shown in FIG. 3, the maximum width W1 (the length of the straight line connecting both ends of the convex portion L21) in the lateral direction (the extension direction of the virtual straight line L2) of the convex portion L21 is formed to be larger than the maximum width W2 (the length of the straight line connecting both ends of the concave portion L22) in the lateral direction of the concave portion L22. The maximum lateral width W1 of the convex portion L21 in the intermediate section L40 is set to six times the maximum height H (maximum distance between the convex portion L21 and the imaginary line L2) of the convex portion L21 from the broken line L1 (imaginary line L2). In addition, the maximum lateral width W1 of the convex portion L21 in the intermediate section L40 is preferably between 2 and 15 times the maximum height H of the convex portion L21, more preferably between 2 and 10 times the maximum height H of the convex portion L21, and even more preferably between 5 and 10 times the maximum height H of the convex portion L21. The maximum height H of the protrusion L21 is, for example, 1 mm or more and 10 mm or less, and preferably 2 mm or more and 7 mm or less.

[0031] The convex portion L21 of the corner section L30 is formed so that the maximum width W1 in the lateral direction of the convex portion L21 and the maximum width W2 in the lateral direction of the concave portion L22 are the same size. The horizontal width W30 of a pair of convex portions L21 and concave portions L22 in the corner section L30 is smaller than the horizontal width W40 of a pair of convex portions L21 and concave portions L22 in the intermediate section L40. In other words, the horizontal interval at which the convex portions L21 and concave portions L22 are repeated in the corner section L30 is narrower than the horizontal interval at which the convex portions L21 and concave portions L22 are repeated in the intermediate section L40.

[0032] As shown in Fig. 2, a straight connection section L60 is provided between the opening start portion 50 and the wavy section L20. The horizontal cutting guide line L10A of the connection section L60 is formed on the folded line L1 (the imaginary straight line L2) between the front end wall 11 and the front inner flap 21, as shown in Fig. 4. The slits K of the connection section L60 are linear, and on the front side of the breaking direction of the slits K, upper slits K1 extending toward the top plate 20 (inner flap 21 side) and lower slits K2 extending toward the bottom plate 30 (end wall 11 side) are alternately connected to adjacent slits K, K.

[0033] When opening the packaging box 1A described above, first, the lower part of the opening start part 50 shown in Fig. 1 is pushed in from the outside, and the lower part of the opening start part 50 is pulled upward with a finger hooked thereon. As a result, the cutting guide line L50 is cut open, the opening start part 50 is separated from the end wall 11, and an opening is formed in the front end wall 11.

[0034] By inserting a hand into the opening formed in the front end wall 11, placing the hand on the inner surface of the front part of the top plate 20, and lifting the front part of the top plate 20, the horizontal cutting guide lines L10A of the left and right connecting sections L60, L60 are cut open. Furthermore, following the horizontal cutting guide lines L10A of the connecting section L60, the horizontal cutting guide lines L10A of the wavy section L20 are cut open. When the entire horizontal cutting guide line L10A is cut open, the top plate 20 is cut off from the upper edge of the body 10, and the top surface of the body 10 is opened as shown in Fig. 5. In this manner, the packaging box 1A can be opened.

[0035] In addition, each convex portion L21 of the wavy section L20 of the horizontal cutting guide line L10A is folded inward at the fold line L1 before opening (as shown in Figure 1), but after the horizontal cutting guide line L10A is cut open, it is raised toward the edge of the opening due to the restoring force of the sheet.

[0036] In the above-described packaging box 1A, as shown in Fig. 3, the wavy section L20 of the horizontal cutting guide line L10A is formed in a wavy linear shape with repeated vertical concaves and convexes. Also, the convex portion L21 of the wavy section L20 is formed large in the horizontal direction, and the top of the convex portion L21 is nearly flat. Also, in the wavy section L20, the adjacent slits K, K are arranged so as not to overlap in the horizontal direction. This allows the wavy section L20 of the horizontal cutting guide line L10A to be easily and smoothly cut open with a small force.

[0037] In the first embodiment, the incision K of the horizontal cutting guide line L10A of the wavy section L20 is separated from the broken line L1 (does not intersect with or connect to the broken line L1), so that when the wavy section L20 is cut open, the cutting direction can be prevented from changing on the broken line L1.

[0038] In the first embodiment, as shown in FIG. 4, a straight-line connection section L60 is provided between the opening start portion 50 and the wavy section L20 in the transverse cutting guide line L10A, so that the transverse cutting guide line L10A can be smoothly cut open from the opening start portion 50 toward the wavy section L20.

[0039] In the first embodiment, when the top plate 20 is separated from the body portion 10 shown in FIG. 1, a single horizontal cutting guide line L10A is cut open, and since the opening start portion 50 is connected to the top plate 20, no cutting chips are generated during opening.

[0040] In the first embodiment, as shown in Fig. 5, a wavy cut edge is formed on the opening edge of the body 10 after opening. In addition, the width of the convex portion L21 in the lateral direction is made large, and the area of ​​the convex portion L21 is made large on the wavy cut edge formed on the opening edge. This makes the opening edge of the packaging box 1A soft to the touch when touched by the hand after opening, and makes the appearance after opening distinctive, making it easy to attract the consumer's attention.

[0041] In the first embodiment, as shown in Fig. 3, the horizontal cutting guide lines L10A of the wavy section L20 intersect with the virtual straight line L2, so that when the horizontal cutting guide lines L10A are formed on the blank sheet S1 shown in Fig. 2, even if the horizontal cutting guide lines L10A of the wavy section L20 are shifted in the direction intersecting with the virtual straight line L2 due to manufacturing errors, the shift is often within the allowable range. Therefore, the packaging box 1A (see Fig. 1) of the first embodiment is suitable for manufacturing using a rotary die cutter.

[0042] In the first embodiment, the horizontal cutting guide line L10A has a narrow horizontal width W30 between a pair of adjacent convex portions L21 and concave portions L22 in a corner section L30 of the wavy section L20. This makes it possible to prevent the horizontal cutting guide line L10A from being cut open at the corner when the corner is formed by bending the adjacent end wall 11 and side wall 12 during box making.

[0043] Although the first embodiment of the present invention has been described above, the present invention is not limited to the first embodiment, and can be appropriately modified without departing from the spirit of the present invention. As shown in FIG. 2, in the wavy section L20 of the horizontal cutting guide line L10A of the first embodiment, the convex portions L21 are formed larger in the horizontal direction than the concave portions L22, but the shapes and numbers of the convex portions L21 and the concave portions L22 are not limited.

[0044] In the first embodiment, as shown in FIG. 1, a transverse cutting guide line L10A is formed on the upper edge of the body 10, but the position of the transverse cutting guide line L10A is not limited, and the position and shape are set according to the contents storage state. For example, a transverse cutting guide line L10A may be formed in the vertical middle of the torso 10, so that the torso 10 can be separated into upper and lower parts when the transverse cutting guide line L10A is cut open. In this case, the transverse cutting guide line L10A formed on the side wall 12 of the torso 10 may be inclined obliquely upward from the front to the rear.

[0045] In the first embodiment, the transverse cutting guide line L10A is formed around the entire circumference of the body 10, but the length of the transverse cutting guide line L10A is not limited. For example, when the transverse cutting guide line L10A is cut open, a part of the edge of the top plate 20 may be connected to the body 10 via a folded line, so that the top plate 20 can be opened relative to the body 10. Also, a cut guide line extending laterally at a vertical interval from the transverse cutting guide line L10A may be formed in parallel to form an opening strip (zipper) on the body 10.

[0046] In the first embodiment, as shown in FIG. 2, the wavy section L20 is formed in a part of the transverse cutting guide line L10A, but the wavy section L20 may be formed on the entire transverse cutting guide line L10A. In the first embodiment, the wavy section L20 is formed with the corner sections L30 and the intermediate sections L40, but the convex sections L21 and the concave sections L22 may be formed in the same shape throughout the entire wavy section L20.

[0047] In the first embodiment, the slits K of the horizontal cutting guide line L10A in the wavy section L20 do not intersect or connect to the broken line L1, but the slits K of the horizontal cutting guide line L10A in the wavy section L20 may intersect or connect to the broken line L1.

[0048] In the first embodiment, as shown in Fig. 1, the opening start portion 50 is formed on the front end wall 11, but the number, position, and shape of the opening start portion 50 are not limited. Furthermore, the opening start portion 50 does not have to be formed on the horizontal cutting guide line L10A.

[0049] In the packaging box 1A of the first embodiment, the body 10 is formed into a rectangular tube shape by the front and rear end walls 11, 11 and the left and right side walls 12, 12, but the number of end walls 11 and side walls 12 constituting the body 10 is not limited. For example, the body may be formed into a triangular, hexagonal, or octagonal shape. Furthermore, the body may be formed into a cylindrical shape. In the packaging box 1A of the first embodiment, the top plate 20 and the bottom plate 30 are configured by overlapping a plurality of flaps, but the configuration of the top plate and the bottom plate is not limited thereto.

[0050] The packaging box 1A of the first embodiment is an A-type cardboard box, but the present invention is applicable to packaging boxes of various shapes. The packaging box 1A of the first embodiment is made of corrugated cardboard, but the packaging box can be formed from various known paperboards.

[0051] [Second embodiment] Next, a packaging box according to a second embodiment will be described. The packaging box according to the second embodiment is formed by mountain-folding or valley-folding a blank sheet S2 made of corrugated cardboard as shown in Fig. 6 at each fold line. The blank sheet S2 shown in Fig. 6 is arranged so that the inner side is visible.

[0052] In the wavy section L20 of the transverse cutting guide line L10B of the second embodiment, as shown in Fig. 7, the top of the convex portion L21 is inclined toward the bottom plate 30 as it moves forward in the cutting direction C. Also, the bottom of the concave portion L22 is inclined toward the bottom plate 30 as it moves forward in the cutting direction C. In this way, the transverse cutting guide line L10B can be smoothly cut open.

[0053] In the wavy section L20 of the horizontal cutting guide line L10B of the second embodiment, the slits K are perpendicular to the broken line L1. In this way, when cutting open the horizontal cutting guide line L10B, the convex portion L21 and the concave portion L22 can be cut open continuously and smoothly across the broken line L1.

[0054] The above describes the second embodiment of the present invention. However, the present invention is not limited to the second embodiment, and similarly to the first embodiment, it can be modified appropriately without departing from the spirit of the present invention. In the wavy section L20 of the second embodiment, the slits K are perpendicular to the broken line L1, but the slits K may be inclined with respect to the broken line L1.

[0055] [Third embodiment] Next, a packaging box according to a third embodiment will be described. The packaging box according to the third embodiment is formed by mountain-folding or valley-folding a blank sheet S3 made of corrugated cardboard as shown in Fig. 8 at each fold line. The blank sheet S3 shown in Fig. 8 is arranged so that the inner side is visible.

[0056] In the wavy section L20 of the transverse cutting guide line L10C of the third embodiment, as shown in Fig. 9, the entire top of the convex part L21 is curved in an arc shape so as to protrude toward the top plate 20. Also, the bottom of the concave part L22 is inclined toward the bottom plate 30 as it approaches the cutting direction C. Furthermore, in the wavy section L20 of the transverse cutting guide line L10C of the third embodiment, the slit K crosses the broken line L1. In this way, the transverse cutting guide line L10C can be smoothly cut open.

[0057] Although the third embodiment of the present invention has been described above, the present invention is not limited to the third embodiment, and similarly to the first embodiment, it can be appropriately modified without departing from the spirit of the present invention. [Explanation of symbols]

[0058] 1A packaging box 10. Torso 11 End Wall 12 Side wall 13 Joint piece 20 Top plate 21 Inner flap 22 Outer flap 30 Bottom plate 31 Inner flap 32 Outer flap 50 Opening start part K1 Top slit K2 Lower slit L1 Line L2 Imaginary line L20 Wavy section L21 protrusion L22 recess L30 Corner section L40 Intermediate section L50 cutting guide wire L60 connecting section L10A Transverse cutting guide wire (first embodiment) L10B Cross-cutting guide wire (second embodiment) L10C Transverse cutting guide wire (third embodiment) S1 Blank sheet (first embodiment) S2 Blank sheet (second embodiment) S3 Blank sheet (third embodiment)

Claims

1. A body portion formed into a cylindrical shape by a wall body; A top plate provided at an upper opening of the body portion; A bottom plate provided at an opening on the lower side of the body portion, A transverse cutting guide line extending laterally is formed on the body portion, The transverse cutting guide wire has intermittent slits formed therein, At least a portion of the transverse cutting guide line has A packaging box characterized in that a wavy section is formed by repeating convex portions bent to protrude toward the top plate side and concave portions bent to protrude toward the bottom plate side with respect to an imaginary straight line extending in the horizontal direction.

2. The packaging box according to claim 1, A packaging box, characterized in that the transverse cutting guide line is formed around the entire circumference of the body portion.

3. The packaging box according to claim 1, A packaging box, characterized in that the maximum width in the lateral direction of the convex portion is between 2 and 15 times the maximum height of the convex portion from the imaginary straight line.

4. The packaging box according to claim 1, A packaging box, characterized in that the maximum width in the lateral direction of the protrusion is formed larger than the maximum width in the lateral direction of the recess.

5. The packaging box according to claim 1, A packaging box characterized in that adjacent slits are arranged so as not to overlap in the horizontal direction.

6. The packaging box according to claim 1, The imaginary straight line is formed on a broken line between the wall body and the top plate, A packaging box, characterized in that in a section where the transverse cutting guide line intersects with the fold line, the slit is spaced from the fold line.

7. The packaging box according to claim 1, The imaginary straight line is formed on a broken line between the wall body and the top plate, A packaging box, characterized in that in a section where the transverse cutting guide line intersects the fold line, the slit intersects the fold line.

8. The packaging box according to claim 1, The wavy section includes a corner section that is in contact with a corner formed by the adjacent wall bodies, The width of the pair of the convex portion and the concave portion in the corner section in the lateral direction is A packaging box characterized in that the width of the pair of the protrusions and recesses in the lateral direction is smaller than the width of the pair of the protrusions and recesses in the other sections than the corner sections.

9. The packaging box according to claim 1, The packaging box according to claim 1, wherein an opening start portion is formed in the transverse tear guide line, and a straight connection section is formed between the opening start portion and the wavy section.

10. The packaging box according to claim 9, A packaging box, characterized in that an upper slit extending toward the top plate and a lower slit extending toward the bottom plate are connected to the slit in the connecting section.

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