Whiteboard for packing box and its packing box

Abstract

The object of the present invention is to provide a whiteboard for a packaging box that prevents a strapping tape from being embedded in a packaging box and is suitable for box making by an automatic packaging machine. A whiteboard for a packaging box is provided with a chamfered portion for preventing edge breakage caused by a logistics belt at an edge formed by wall panels in two directions connected by a main trace line, wherein the chamfered portion is formed by auxiliary trace lines arranged in a mirror-symmetrical manner with respect to the main trace line, the main trace line and the auxiliary trace line are arranged on the inner surface side of the whiteboard, holes are arranged on the outer surface side of the whiteboard at positions corresponding to the main trace line and the auxiliary trace line, and holes are further arranged on the auxiliary trace line.

Description

Technical Field

[0001] The present invention relates to a blank sheet for a packaging box, and more particularly to a blank sheet for a packaging box that can be used with an automatic sealing device, and a packaging box made of the blank sheet, wherein even when the packaging box is tied with a resin tie band, the tie band is not easily embedded in the packaging box. Background Art

[0002] When transporting goods, they are usually packed in corrugated boxes for transport from the viewpoints of impact resistance, anti-fouling, and ease of loading and carrying. In addition, when multiple corrugated boxes are transported together, resin strapping is widely used to tie them up so that the corrugated boxes do not scatter.

[0003] When corrugated cardboard boxes are tied with strapping tape, the strapping tape may sometimes get stuck in the corners of the box and cause the edges to break. Lightweight corrugated cardboard boxes are particularly prone to getting stuck with strapping tape, and this tendency is greater in environments with high humidity, where the rigidity of the corrugated cardboard boxes is weakened. If strapping tape gets stuck in the box or causes the edges to break, it is easy to cause the goods in the box to be deformed, or insects and water to easily enter the box.

[0004] Therefore, in order to prevent the strapping tape from being embedded in the corrugated paper box, a method of providing a chamfered portion at the corner of the corrugated paper box has been proposed. For example, Patent Document 1 discloses a corrugated paper box in which a step-like crushed portion is formed on one side of the corrugated paper box with a basic fold line and a separation fold line is formed on the other side as an edge crack prevention processing portion. The corrugated paper box is configured so that when tension is applied to the strap to tighten the edge portion, the corrugated paper at the edge portion is double-folded to form an inclined surface, thereby increasing the winding strength and suppressing the strap from being embedded in the corrugated paper.

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6112992

[0008] In addition, the corrugated box described in Patent Document 1 is called a so-called citrus box (a corrugated paper packaging box based on JIS Z150702 (groove-shaped)). The groove-shaped corrugated box has a certain degree of capacity, so it is convenient to store items of different sizes in one box. The groove-shaped corrugated box is usually used by first sealing the bottom surface, then putting the goods inside the corrugated box and sealing the top surface. In addition, since the groove-shaped corrugated box is mostly assembled and sealed by hand, the production line suitability requirements for the folding of the flaps, etc. are not so strict.

[0009] On the other hand, in addition to the above-mentioned grooved shapes, there are also JISZ1507 03 (contracted shape), 04 (assembly shape), 05 (insertion shape), 06 (slit shape), 07 (simple pasting assembly shape) and the like in corrugated paper packaging boxes. In particular, when bundling multiple commodities of the same shape, an assembly shape that can make a box by placing multiple commodities on a whiteboard is mostly used. Here, the box making of the assembled corrugated paper is carried out using an automatic sealing device (hereinafter referred to as an "automatic packaging machine (Automaticcaser)"). When the box is made by an automatic packaging machine, strict production line suitability is required for the corrugated box. Therefore, if a chamfered portion such as that in Patent Document 1 is provided in the assembled corrugated box, the frequency of poor box making may increase compared to the case where the chamfered portion is not provided. Summary of the invention

[0010] Problems to be solved by the invention

[0011] The present invention has been completed in view of the above-mentioned problems. That is, the object of the present invention is to provide a whiteboard for a packaging box suitable for box making by an automatic packaging machine, which prevents the strapping tape from being embedded in the packaging box, and the packaging box. The inventors have studied the setting method of the main trace line and the auxiliary trace line so that it is not easy to apply force to the auxiliary trace line when the box is made by an automatic packaging machine, and the auxiliary trace line is applied force when the tape is tied. In addition, it has been newly discovered that the above-mentioned problem can be solved by the setting method of the auxiliary trace line, thereby completing the present invention.

[0012] Solutions to Solve Problems

[0013] In order to solve the above-mentioned problems, the present invention provides a whiteboard, which is a whiteboard of a packaging box having a chamfered portion provided at an edge portion formed by wall panels in two directions connected by a main trace line for preventing edge breakage caused by a logistics belt, wherein the chamfered portion is formed by auxiliary trace lines that are arranged in a mirror-symmetrical manner around the main trace line, the main trace line and the auxiliary trace lines are provided on the inner surface side of the whiteboard, and the main trace line is provided on the outer surface side of the whiteboard.

[0014] According to this structure, since only the auxiliary trace line is provided on the inner surface side of the whiteboard, it is not easy to produce a poor box making when the box is made by an automatic packaging machine. In addition, since the main trace line is provided on the inner and outer surfaces of the whiteboard, it is easy to make a box.

[0015] Furthermore, in the above structure, it is preferred that holes are provided on the outer surface side of the main whiteboard at positions corresponding to the auxiliary trace lines. In addition, it is preferred that holes are further provided on the auxiliary trace lines. Furthermore, it is preferred that the main trace lines and the auxiliary trace lines are stepped and the main trace lines on the inner surface side of the packaging box are processed to be deeper than the main trace lines on the outer surface side of the packaging box.

[0016] According to this structure, by arranging the eyelet, it is easy to form the chamfered portion when tying with the tying band. In addition, by arranging the difference in the depth of the step-type crushing structure, the ease of box making can be improved.

[0017] Effects of the Invention

[0018] According to the present invention, it is possible to provide a whiteboard of a packaging box which prevents a bundling band from being inserted into a packaging box and is suitable for packaging by an automatic packaging machine, and the packaging box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a perspective view showing a packaging box according to an embodiment.

[0020] Figure 2 yes Figure 1 The expanded view of the packaging box is a view showing the inner surface side.

[0021] Figure 3 yes Figure 1 The expanded view of the packaging box is a view showing the outer surface side.

[0022] Figure 4 It means that Figure 1 A three-dimensional diagram of the stacked packaging boxes.

[0023] Figure 5 It is shown tied with a strap. Figure 4 A three-dimensional diagram of the state of the packaging box.

[0024] Figure 6 The drawings are used to illustrate the state of a packaging box before and after the strap is tightened, wherein (a) is a partial enlarged view and a cross-sectional view showing the state before the strap is tightened, and (b) is a partial enlarged view and a cross-sectional view showing the state after the strap is tightened.

[0025] Figure 7 The drawings are used to illustrate the state of a conventional packaging box before and after the strap is tightened. (a) is a partial enlarged view and a cross-sectional view showing the state before the strap is tightened, and (b) is a partial enlarged view and a cross-sectional view showing the state after the strap is tightened. DETAILED DESCRIPTION

[0026] Hereinafter, the embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this embodiment, a packaging box using a single-wall or double-wall corrugated paperboard with a corrugated core disposed between a surface liner (the outer surface of the packaging box) and a backing liner (the inner surface of the packaging box) is described as an example. It should be noted that the same reference numerals are used for the same elements, and repeated descriptions are omitted. In addition, in the following description, the front, back, left, right, up, and down directions are indicated by Figure 1 The packaging box shown is a reference.

[0027] In this manual, "height" means Figure 1 The up and down direction in the “width” indicates Figure 1 The front-to-back direction and the length in Figure 1 The left and right direction in .

[0028] <About structure>

[0029] Figure 1 is a perspective view of the packaging box before opening according to the present embodiment. Figure 2 , 3 Yes Figure 1 The whiteboard after the packaging box is unfolded, Figure 2 is a top view showing the inner surface side, Figure 3 is a top view showing the outer surface side. Figure 2 , 3 In the figure, the thick solid line represents the shape of the whiteboard, the single-point trace line represents the main trace line that is easy to bend, the thin solid line represents the auxiliary trace line that makes deformation easy during strapping, and the dotted line represents the hole set at the position corresponding to the auxiliary trace line.

[0030] The packaging box of the present embodiment is used to store articles therein. Examples of the articles include packaged instant food in bags, and instant food in cylindrical or inverted truncated cone-shaped containers, but the present invention is not limited thereto.

[0031] like Figure 1 to Figure 3 As shown, the packaging box 10 of the present embodiment is a corrugated paper packaging box based on JIS Z1507-1989 04 (assembly form) 0410 (code), and is a wrap-around box having a substantially rectangular parallelepiped shape, wherein the long sides of the rectangular first face portion (bottom face portion) 11 and the fourth face portion (top face portion) 14 are longer than the short sides, and the height is shorter than the length of the short sides of the first face portion 11 and the fourth face portion 14. The packaging box 10 is configured to include five rectangular face portions from the first face portion 11 to the fifth face portion 15, four inner folding wing portions, namely a pair of first inner folding wing portions 21 and a pair of second inner folding wing portions 23, and four outer folding wing portions, namely a pair of first outer folding wing portions 31 and a pair of second outer folding wing portions 33. In the packaging box 10 of the present embodiment, as shown in FIG. Figure 2 As shown, from the left, the fifth face portion 15, the fourth face portion 14, the third face portion 13, the first face portion 11, and the second face portion 12 are continuous in this order. On the other hand, the second face portion 12 and the fifth face portion 15 are not continuous.

[0032] The first surface portion (bottom surface portion) 11 is rectangular, and has a first edge L1 and a second edge L2 that are parallel to each other, and a pair of third edges L3 that are perpendicular to the first edge L1 and parallel to each other.

[0033] The second surface (one length surface) 12 is rectangular and has a pair of fourth edges L4 that are parallel to each other and perpendicular to the first edge L1. The second surface is bent at a right angle through the first edge (first main trace line) L1 to connect to the long side of the first surface 11.

[0034] The third face portion (the other side's length face portion) 13 is a rectangle having a fifth edge L5 parallel to the second edge L2 and a pair of sixth edges L6 parallel to each other and orthogonal to the second edge L2. It is connected to the long side of the first face portion 11 by being bent at a right angle through the second edge (second main trace line) L2 and is opposite to the second face portion 12.

[0035] The fourth face portion (top face portion) 14 is a rectangle, having a pair of seventh edges L7 parallel to each other and orthogonal to the fifth edge L5, and an eighth edge L8 parallel to the fifth edge L5, and is connected to the long side of the third face portion 13 by being bent at a right angle through the fifth edge (fifth main trace line) L5, and is opposite to the first face portion 11.

[0036] The fifth surface (side surface, long surface) 15 is rectangular, is bent at a right angle via an eighth edge (eighth main trace line) L8 to connect to the long side of the fourth surface 14 , and is opposite to the third surface 13 .

[0037] The pair of first inner flap portions (width surface portions) 21 are bent at right angles via a pair of fourth edges (fourth main trace lines) L4 to be connected to the short sides of the second surface portion 12 , respectively, and face each other.

[0038] The pair of second inner flap portions (width surface portions) 23 are bent at right angles via a pair of sixth edges (sixth main trace lines) L6 to be connected to the short sides of the third surface portion 13 , respectively, and face each other.

[0039] The pair of first outer flap portions (width surface portions) 31 are bent at right angles via a pair of third edges (third main trace lines) L3 to be connected to the short sides of the first surface portion 11 , respectively, and face each other.

[0040] The pair of second outer flap portions (width surface portions) 33 are bent at right angles via a pair of seventh edges (seventh main trace lines) L7 to be connected to the short sides of the fourth surface portion 14 , respectively, and face each other.

[0041] (About main trace lines L1 to L8)

[0042] The main trace line of this embodiment is easy to bend based on the main trace line in the box making process, thereby playing a role in suppressing box making defects. In this embodiment, the main trace line is formed by step-type crushing from both sides of the surface lining plate and the backing plate toward the core.

[0043] like Figure 2 ,3 As shown, the whiteboard of this embodiment is set so that the first main trace line L1, the second main trace line L2, the fifth main trace line L5, and the eighth main trace line L8 become the longitudinal trace lines (so-called creases) of the corrugated paper, and a pair of third main trace lines L3, a pair of fourth main trace lines L4, a pair of sixth main trace lines L6, and a pair of seventh main trace lines L7 become the transverse trace lines (so-called scores) of the corrugated paper. The formation direction of the trace lines of this embodiment is along each edge, but it is not limited to this, and can also be formed in any direction.

[0044] (About auxiliary trace line 40)

[0045] The auxiliary trace line 40 of this embodiment plays a role in guiding the formation of the chamfered portion 50 described later when the tension caused by the strapping band is applied to the corner of the packaging box 10. That is, the portion surrounded by the auxiliary trace line 40 functions as the chamfered portion 50 described later. Figure 2 As shown, in this embodiment, the auxiliary trace line 40 is formed by step-crushing only from the backing plate side toward the core. It should be noted that the step-crushing at the auxiliary trace line 40 is preferably shallower than the step-crushing at the main trace lines L1 to L8.

[0046] In the present embodiment, the auxiliary trace lines 40 are formed to be mirror-symmetrical with respect to the main trace lines L1 to L8. In more detail, the auxiliary trace lines 40 are composed of a pair of sides 41 arranged parallel to the main trace lines and sandwiching the main trace lines, and sides 42 arranged from both ends of each side 41 toward the main trace lines in such a manner that the angle formed with the sides 41 is an obtuse angle. Among the ends of the sides 42, the ends that are not connected to the sides 41 are connected to each other by the ends of the sides 42 to form a closed space. It should be noted that in the present embodiment, the shape formed by the auxiliary trace lines is a hexagon, but there is no particular limitation as long as it is a polygonal shape consisting of an even number of angles greater than 6.

[0047] (Regarding chamfered portion 50)

[0048] use Figure 2 , the chamfered portions provided at the first edge L1, the second edge L2, and the pair of third edges L3 are described. Here, the chamfered portions at the eighth edge L8, the fifth edge L5, and the pair of seventh edges L7 are respectively the same as the chamfered portions at the first edge L1, the second edge L2, and the pair of third edges L3, and thus the description thereof is omitted.

[0049] The chamfered portion 50 is used to prevent the packaging box 10 from being damaged when being tied with a resin band. As will be described in detail later, the chamfered portion 50 is formed by flattening the corner of the packaging box 10, which can prevent embedding. The chamfered portion 50 is equivalent to the polygonal shape formed by the auxiliary trace line 40. It should be noted that in this embodiment, on the four edges (main trace lines) L1 to L3 of the first surface, a chamfered portion 50 is provided at the center of each main trace line.

[0050] (About hole 60)

[0051] In this embodiment, in order to facilitate the formation of the chamfered portion 50 when the tension is applied by the band without affecting the box manufacturing, the backing plate may be further provided with a hole 60. As the position for providing the hole 60, it is preferred to provide the hole 60 on the auxiliary trace line 40 subjected to the step-type crushing process. In addition, the hole 60 may be provided on the surface plate in addition to the backing plate. As the position of the hole 60 provided on the surface plate, it is preferred to provide it at a position corresponding to the auxiliary trace line 40 provided on the backing plate.

[0052] <About Packaging Box Manufacturing>

[0053] An example of assembling a packaging box 10 by the whiteboard 10B of the present embodiment is described. First, the whiteboard 10B is arranged so that the backing plate is located on the upper side. Next, the items to be accommodated are placed on the first surface 11. With the first surface 11 as the center, the second surface 12 and the third surface 13 are bent via the first main trace line L1 and the second main trace line L2. Then, a pair of first inner folding wing portions 21 and a pair of second inner folding wing portions 23 are bent via a pair of fourth main trace lines L4 and a pair of sixth main trace lines L6. Next, a pair of first outer folding wing portions 31 are bent via a pair of third main trace lines L3 in a manner overlapping on the first inner folding wing portions 21 and the second inner folding wing portions 23, and are bonded to the first inner folding wing portions 21 and the second inner folding wing portions 23. Furthermore, the fourth face portion 14 is folded along the fifth main trace line L5 to be opposed to the first face portion 11, and then the pair of second outer wing portions 33 are folded along the pair of seventh main trace lines L7 so as to overlap the first inner wing portion 21 and the second inner wing portion 23, and bonded to the first inner wing portion 21 and the second inner wing portion 23. Finally, the fifth face portion 15 is folded along the eighth main trace line L8 so as to overlap the second face portion 12, and bonded to the second face portion 12, thereby assembling Figure 1The packaging box 10 shown. The bonding of this embodiment is performed by, for example, pasting (hot melting) with an adhesive such as a hot melt resin. In addition, the application of the adhesive of this embodiment can be performed on each bonding portion at an appropriate time. Through this assembly, a packaging box 10 is formed, which has the first face 11 as the bottom face, the fourth face 14 as the top face, the second face 12, the fifth face 15 and the third face 13 as the length face, and a pair of first inner folding wing parts 21, a pair of second inner folding wing parts 23, a pair of first outer folding wing parts 31 and a pair of second outer folding wing parts 33 as the width face. Here, according to the present invention, the main trace lines L1 to L8 are step-type crushing processing, so they are easy to bend. In addition, since the auxiliary trace lines 40 are only provided on the back lining board, it is not easy to cause poor box manufacturing. When making a box, the auxiliary trace lines 40 are not bent because the main trace lines L1 to L8 are provided on both sides of the surface lining board and the back lining board, and are therefore easier to bend than the auxiliary trace lines 40. That is, it is considered that since the main trace lines L1 to L8 are easily bent, the force applied for box manufacturing is easily concentrated on the main trace lines L1 to L8 and is not transmitted to the auxiliary trace lines 40.

[0054] <Regarding the formation mechanism of the chamfered portion 50>

[0055] The chamfered portion 50 is formed as follows. Figure 1 As shown, the front lining plate (outer side) of the packaging box 10 just after box manufacturing in this embodiment has the hole 60 which matches the shape of the chamfered portion 50, but the chamfered portion 50 has not yet been formed. Figure 4 The packaging box 10 is formed by vertically arranging the packaging box 10 in the vertical direction (refer to Figure 1 ) stacked multiple (here three) of the packaging boxes 10. The stacked packaging boxes 10 are stacked in the width direction and the length direction ( Figure 1 Tie the straps on the front and rear directions and left and right directions (refer to Figure 5 The straps tied to the packaging boxes 10 abut against the corners of the uppermost and lowermost packaging boxes 10 while the straps are tightened. The straps abutting against the corners of the packaging boxes 10 exert a tightening force on the inside of the packaging boxes 10.

[0056] At this time, if Figure 6 As shown in (a) of FIG. 1 , the packaging box 10 disperses the tension concentrated on the corners. The tension applied to the corners is as follows: Figure 6The tension is transmitted on the face of the packaging box 10 as shown by the solid hollow arrow in (a). The tension transmitted in this way is also transmitted to the auxiliary trace line 40. Since the stepped crushed portion of the auxiliary trace line 40 is the back lining that is crushed toward the center, it is easy to bend due to the force transmitted from the corner. In addition, if holes 60 are provided on the surface lining and the auxiliary trace line 40, the stress is concentrated on the holes 60, making it easier to bend. As a result, the auxiliary trace line 40 bends. If the auxiliary trace line 40 is also bent at a certain point, the force transmitted along the face is transmitted along the auxiliary trace line 40 and propagates. When the auxiliary trace line 40 is bent, the chamfered portion 50 appears, and at the same time, the corner is as Figure 6 The plane is restored as in (b). Here, when the chamfered portion 50 is formed, the number of corners that originally had only one increases to two. By increasing the number of corners to two, the tension that was previously applied to one corner can be further dispersed, preventing embedding into the packaging box. In addition, by forming the chamfered portion 50, the contact area between the strap and the corrugated cardboard box is increased, so that the bundle can be tied more firmly. Moreover, unlike the existing packaging box, it does not cause embedding, but only a surface depression.

[0057] In contrast, existing packaging boxes such as Figure 7 As shown, even if the tension concentrated on the corners is transmitted to the face of the packaging box, there is no location where the stress is concentrated. As a result, if the tension concentrated on the corners exceeds the limit, the edge will be broken due to the embedding of the belt.

[0058] Hereinafter, the present invention will be described in more detail by taking a specific structure as an example.

[0059] A packaging box whiteboard was prepared based on the conditions described in Table 1. The containerized ready-to-eat food was placed on the whiteboard and the box was made using an automatic packaging machine. Three packaging boxes were prepared for each example and comparative example. The obtained packaging boxes were tested under the following conditions.

[0060] [Table 1]

[0061] Main trace line Auxiliary trace line Eyelets Example 1 Both sides of the back Back side only none Example 2 Both sides of the back Back side only Surface only Example 3 Both sides of the back Back side only Back side only Example 4 Both sides of the back Back side only Both sides of the back Comparative Example Surface only none none

[0062] (Box making test)

[0063] The white plates according to Table 1 were boxed using an automatic packaging machine, and boxing defects were confirmed from the viewpoint of boxing suitability. The criteria for boxing suitability are as follows.

[0064] ○: Using existing equipment, box making can be performed in the same manner as with ordinary whiteboards.

[0065] △: Although losses occurred in the current setting, the box can be manufactured with slight adjustments.

[0066] ×: It requires a significant equipment modification and is difficult to use in conjunction with the case making of ordinary whiteboards.

[0067] (Bundle test)

[0068] The bundle test is to put the ready-to-eat food packaging box into the container. Figure 4 As shown, three layers are overlapped and tied with straps in the width direction and the length direction. The straps are tightened in a way that the straps do not bend and are in close contact with the surface. At this time, check whether the straps are embedded in the corners of the packaging box or whether the edges are broken. The judgment criteria are as follows. The results are shown in Table 2.

[0069] ⊚: The chamfered portion was formed into a desired shape, and neither the band was embedded nor the edge was broken.

[0070] ○: The chamfered portion is slightly insufficiently formed, but the band is not embedded or the edge is not broken. The desired function is almost achieved, and embedding is unlikely to occur.

[0071] ×: Embedding of the band and edge breakage occurred.

[0072] [Table 2]

[0073] Box making test Bundle test Example 1 ○ ○ Example 2 ○ ○ Example 3 ○ ○ Example 4 ○ ◎ Comparative Example ○ ×

[0074] It is clear from Table 2 that no defective box making occurred in Examples 1 to 4. In addition, in any of the examples, no embedding or edge breakage occurred in the bundling test. It can be seen that by setting the auxiliary trace line on the backing plate (the inside of the packaging box), it helps with box making and preventing the embedding of the drawstring. It should be noted that, by comparing Examples 1 to 4, it can be seen that only the auxiliary trace line is sufficient as a countermeasure for the embedding of the drawstring, and it is effective to prevent the embedding of the drawstring by setting the eyelet to form the chamfered portion into the desired shape. In particular, when the eyelet is set on both the front and back surfaces, the formation of the chamfered portion becomes easy.

[0075] As described above, in the present invention, by providing the auxiliary trace line on the inner surface side of the packaging box, it is possible to suppress the occurrence of box manufacturing defects during box manufacturing, and to form a chamfered portion when the box is bundled with a band, thereby achieving the effect of preventing the band from being embedded and the edge from being broken.

[0076] Description of reference numerals:

[0077] 1. Packaging

[0078] 10 Packing box

[0079] 10B Whiteboard

[0080] 11. First face (bottom face)

[0081] 12 Second face (length of one side face)

[0082] 13 The third face (the other side's length face)

[0083] 14 Fourth face (top face)

[0084] 15 Fifth face (side face, length face)

[0085] 21 A pair of first inner folding wings

[0086] 23 A pair of second inner folding wings

[0087] 31 A pair of first outer folding wings

[0088] 33 A pair of second outer wing portions

[0089] 40 Auxiliary trace lines

[0090] 50 Chamfer

[0091] 60 Eyelets

[0092] L1 First edge (first main trace line)

[0093] L2 Second edge (second main trace line)

[0094] L3 A pair of third edges (third main trace lines)

[0095] L4 A pair of fourth edges (fourth main trace line)

[0096] L5 Fifth edge (fifth main trace line)

[0097] L6 A pair of sixth edges (sixth main trace line)

[0098] L7 A pair of seventh edges (seventh main trace line)

[0099] L8 The eighth edge (eighth main trace line).

Claims

1. A whiteboard for a packaging box, wherein a chamfered portion for preventing edge breakage caused by a logistics belt is provided at an edge portion formed by wall panels in two directions connected via a main trace line, wherein: The chamfered portion is formed by an auxiliary trace line that is arranged to be mirror-symmetrical with the main trace line. The main trace line and the auxiliary trace line are provided on the inner surface side of the whiteboard. The main trace line is provided on the outer surface side of the white board. On the outer surface side of the whiteboard, holes having the same shape as the chamfered portion are provided at positions corresponding to the auxiliary trace lines. The auxiliary trace line is further provided with holes, The auxiliary trace line is provided only on the inner surface side of the white board.

2. The whiteboard according to claim 1, wherein: The main trace line and the auxiliary trace line are stepped and crushed, and the main trace line on the inner surface side of the packaging box is processed to be deeper than the main trace line on the outer surface side of the packaging box.

3. A packaging box, wherein: The packaging box is made of the whiteboard according to claim 1 or 2.

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