JP7479890B2 - Blank sheets for packaging boxes and packaging boxes - Google Patents

Description

The present invention relates to a blank sheet for a packaging box. More specifically, it relates to a blank sheet for a packaging box that is compatible with an automatic sealing device, and a packaging box made of the blank sheet is a packaging box that is difficult for the plastic cable tie to bite into even when it is tied with the cable tie.

When transporting goods, it is common to pack the goods in cardboard boxes for shock resistance, stain resistance, ease of loading and transport, etc. Furthermore, when multiple cardboard boxes are packed together for transport, it is common to tie the boxes together with plastic cable ties to prevent them from falling apart.

When binding cardboard boxes with cable ties, the cable ties can sometimes bite into the corners of the box, causing the edges to break. Lightweight cardboard boxes are particularly susceptible to cable ties getting stuck in them, and this tendency is even stronger in humid environments, where the rigidity of the box weakens. If cable ties get stuck in the cardboard box or the edges get torn, it can cause problems such as deformation of the products inside the box and making it easier for insects and water to get into the box.

A method has been proposed in which the corners of a cardboard box are provided with chamfered sections to prevent the cable ties from digging into the cardboard box. For example, Patent Document 1 discloses a cardboard box in which a corrugated section is formed on one side of a base fold line and a separating fold line on the other side as an edge-cut prevention section. When tension is applied to the band and the ridge is tightened, the cardboard at the ridge is folded twice, creating an inclined surface, improving the tightening strength and preventing the band from digging into the cardboard.

Patent No. 6112992

The cardboard box described in Patent Document 1 is what is known as a mandarin orange box (a cardboard packaging box based on JIS Z 1507 02 (grooved)). Grooved cardboard boxes have a certain amount of capacity, making them convenient for storing items of different sizes together in one box. These grooved cardboard boxes are generally used by first sealing the bottom, then sealing the top after placing products inside the cardboard. Furthermore, because grooved cardboard boxes are often assembled and sealed by hand, there is no requirement for strict line suitability for folding the flaps, etc.

On the other hand, in addition to the above-mentioned grooved type, there are also JIS Z 1507 03 (telescope type), 04 (assembly type), 05 (insertion type), 06 (Bliss type), and 07 (glue simple assembly type) for cardboard packaging boxes. In particular, when packaging multiple products of the same shape, the assembly type, which allows multiple products to be placed on a blank sheet and then assembled into a box, is often used. Here, assembled cardboard boxes are made using an automatic sealing device (hereinafter referred to as an "autocaser"). When making boxes using an autocaser, strict line suitability is required for the cardboard boxes. Therefore, if a chamfered portion as in Patent Document 1 is provided on an assembled cardboard box, there is a risk that the frequency of box-making defects will increase compared to when no chamfered portion is provided.

The present invention was made in consideration of the above problems. In other words, the objective is to provide a blank sheet for a packaging box that prevents cable ties from digging into the packaging box and is suitable for box-making in an automatic caser, and the packaging box made from the sheet. The inventors have investigated how to set the main and auxiliary creases so that force is not applied to the auxiliary creases when boxes are made in an automatic caser, but force is applied to the auxiliary creases when the bands are fastened. They have newly discovered that the above problems can be solved by setting the auxiliary creases in a certain way, which has led to the completion of the present invention.

To solve the above problems, the present invention provides a blank sheet for a packaging box in which a chamfer is provided at the twill portion formed by two wall panels connected in two directions via a main line to prevent the edges from being cut by a logistics band, the chamfer being formed by auxiliary lines that are provided in a mirror image on either side of the main line, the main line and the auxiliary lines being provided on the inner surface of the blank sheet, and the main line being provided on the outer surface of the blank sheet.

With this configuration, auxiliary lines are provided only on the inner surface of the blank sheet, making it less likely that defects will occur when the blank sheet is assembled into a box using an autocaser. In addition, main lines are provided on both the inner and outer surfaces of the blank sheet, making the box assembly easier.

Furthermore, in the above configuration, it is preferable that perforations are provided on the outer surface of the main blank sheet at positions corresponding to the auxiliary lines. It is also preferable that the auxiliary lines are further perforated. Furthermore, it is preferable that the main lines and the auxiliary lines are stepped, and that the main lines on the inner surface of the packaging box are processed deeper than the main lines on the outer surface of the packaging box.

With this configuration, the provision of perforations makes it easier to form chamfered sections when fastening with a fastening band. Also, by providing a difference in the depth of the stepped structure, it is possible to improve the ease of box making.

According to the present invention

FIG. 1 is a perspective view showing a packaging box according to an embodiment. FIG. 2 is a development view of the packaging box of FIG. 1, showing the inner side. FIG. 2 is a development view of the packaging box of FIG. 1, showing the outer surface side. FIG. 2 is a perspective view showing a state in which the packaging boxes of FIG. 1 are stacked. 5 is a perspective view showing a state in which the packaging box of FIG. 4 is fastened with a fastening band. FIG. FIG. 11 is an explanatory diagram for explaining the state of a packaging box in one embodiment before and after tightening the fastening band, where (a) is a partially enlarged view and a cross-sectional view showing the state before tightening the fastening band, and (b) is a partially enlarged view and a cross-sectional view showing the state after tightening the fastening band. FIG. 11 is an explanatory diagram for illustrating the state before and after tightening the fastening band for a conventional packaging box, where (a) is a partially enlarged view and a cross-sectional view showing the state before tightening the fastening band, and (b) is a partially enlarged view and a cross-sectional view showing the state after tightening the fastening band.

The following describes in detail an embodiment of the present invention with reference to the drawings. In this embodiment, a packaging box using single-flute double-sided corrugated paper with a corrugated core disposed between the front liner (the outer surface of the packaging box) and the back liner (the inner surface of the packaging box) is used as an example. Note that identical elements are given the same reference numerals, and duplicated explanations will be omitted. In the following explanation, the front-back, left-right, top-bottom directions are based on the state of the packaging box shown in Figure 1.

In this specification, "height" refers to the up-down direction in FIG. 1, "width" refers to the front-to-back direction in FIG. 1, and "length" refers to the left-to-right direction in FIG. 1.

<About the structure>
Fig. 1 is a perspective view of a packaging box according to this embodiment before opening, and Figs. 2 and 3 are plan views of a blank sheet obtained by unfolding the packaging box shown in Fig. 1, showing the inner side in Fig. 2 and the outer side in Fig. 3. In Figs. 2 and 3, thick solid lines indicate the outline of the blank sheet, dashed lines indicate main lines for facilitating folding, thin solid lines indicate auxiliary lines for facilitating deformation when fastening the band, and dashed lines indicate perforations provided at positions corresponding to the auxiliary lines.

The packaging box in this embodiment is used to store an item inside. Examples of items include, but are not limited to, instant food in a packed bag, instant food in a cylindrical or inverted frustum-shaped container, etc.

As shown in Figures 1 to 3, the packaging box 10 according to this embodiment is a cardboard packaging box based on JIS Z 1507-1989 04 (assembled type) 0410 (code), and is a wraparound case having a roughly rectangular parallelepiped shape in which the long sides of the rectangular first surface portion (bottom surface portion) 11 and fourth surface portion (top surface portion) 14 are longer than the short sides, and the height is shorter than the length of the short sides of the first surface portion 11 and fourth surface portion 14. This packaging box 10 is configured with five rectangular surfaces from the first surface portion 11 to the fifth surface portion 15, four inner flap portions consisting of a pair of first inner flap portions 21 and a pair of second inner flap portions 23, and four outer flap portions consisting of a pair of first outer flap portions 31 and a pair of second outer flap portions 33. In the packaging box 10 according to this embodiment, as shown in FIG. 2, from the left, the fifth surface 15, the fourth surface 14, the third surface 13, the first surface 11, and the second surface 12 are continuous in this order. On the other hand, the second surface 12 and the fifth surface 15 are not continuous.

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.

The second surface portion (one of the long surfaces) 12 is rectangular and has a pair of parallel fourth edges L4 that are perpendicular to the first edge L1, and is bent at a right angle via this first edge (first main ruled line) L1 to connect to the long side of the first surface portion 11.

The third surface portion (the other long surface portion) 13 is rectangular and has a fifth edge L5 parallel to the second edge L2 and a pair of sixth edges L6 that are parallel to each other and perpendicular to the second edge L2. The third surface portion 13 bends at a right angle via the second edge (second main ruled line) L2 to connect to the long side of the first surface portion 11 and faces the second surface portion 12.

The fourth surface portion (top surface portion) 14 is rectangular and has a pair of parallel seventh edges L7 that are perpendicular to the fifth edge L5, and an eighth edge L8 that is parallel to the fifth edge L5. The fourth surface portion (top surface portion) 14 is bent at a right angle via the fifth edge (fifth main line) L5 to connect to the long side of the third surface portion 13 and faces the first surface portion 11.

The fifth surface portion (side surface portion, longitudinal surface portion) 15 is rectangular and bends at a right angle via the eighth edge (eighth main line) L8 to connect to the long side of the fourth surface portion 14 and face the third surface portion 13.

The pair of first inner flap portions (width surface portions) 21 are bent at right angles via a pair of fourth edges (fourth main lines) L4, each of which is connected to a short side of the second surface portion 12 and faces each other.

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

The pair of first outer flap portions (width surface portions) 31 are bent at right angles via a pair of third edges (third main lines) L3, each of which is connected to a short side of the first surface portion 11 and faces each other.

The pair of second outer flap portions (width surface portions) 33 are bent at right angles via a pair of seventh edges (seventh main lines) L7, each of which is connected to a short side of the fourth surface portion 14 and faces each other.

(Regarding main lines L1 to L8)
The main crease in this embodiment serves to prevent defective box-making by making it easier to fold the box using the main crease as a reference during the box-making process. In this embodiment, the main crease is formed by a step-crushing process in which the front liner and the back liner are crushed from both sides toward the core.

As shown in Figures 2 and 3, the blank sheet in this embodiment is configured so that the first main line L1, the second main line L2, the fifth main line L5, and the eighth main line L8 are vertical lines of the cardboard (so-called creases), and the pair of third main lines L3, the pair of fourth main lines L4, the pair of sixth main lines L6, and the pair of seventh main lines L7 are horizontal lines of the cardboard (so-called scores). In this embodiment, the lines are formed along each edge, but this is not limited to the direction, and they may be formed in any direction.

(Regarding auxiliary ruled line 40)
The auxiliary creases 40 in this embodiment serve to guide the formation of chamfered portions 50, which will be described later, when tension from the cable ties is applied to the corners of the packaging box 10. In other words, the areas surrounded by the auxiliary creases 40 function as the chamfered portions 50, which will be described later. As shown in Fig. 2, in this embodiment, the auxiliary creases 40 are formed by a step-crushing process that crushes only from the back liner side toward the core. Note that the step-crushing process for the auxiliary creases 40 is preferably shallower than the step-crushing process for the main creases L1 to L8.

In this embodiment, the auxiliary lines 40 are formed to be mirror images of the main lines L1 to L8. More specifically, the auxiliary lines 40 are composed of a pair of sides 41 arranged parallel to the main lines on either side of the main lines, and sides 42 arranged from both ends of each side 41 toward the main lines so that the angles between the sides 41 are obtuse angles. The ends of the sides 42 that are not in contact with the side 41 are in contact with each other to form a closed space. Note that in this embodiment, the shape formed by the auxiliary lines is a hexagon, but there is no particular limitation as long as it is a polygonal shape with an even number of angles of six or more.

(Regarding chamfered portion 50)
The chamfered portions provided on the first edge L1, the second edge L2, and the pair of third edges L3 will be described with reference to Fig. 2. Here, the chamfered portions on the eighth edge L8, the fifth edge L5, and the pair of seventh edges L7 are similar in shape to the chamfered portions on the first edge L1, the second edge L2, and the pair of third edges L3, respectively, and therefore will not be described here.

The chamfered portion 50 is intended to prevent damage to the packaging box 10 when it is fastened with a resin band. Details will be described later, but by crushing the corners of the packaging box 10 to form the chamfered portion 50, it is possible to prevent it from being pinched in. The chamfered portion 50 corresponds to a polygonal shape formed by the auxiliary lines 40. Note that in this embodiment, the four edges (main lines) L1 to 3 of the first surface portion have chamfered portions 50 provided in the center of each main line.

(Regarding perforation 60)
In this embodiment, a perforation 60 may be further provided in the back liner for the purpose of making it easier to form the chamfered portion 50 when tension is applied by the fastening band without affecting the box making. The perforation 60 is preferably provided on the auxiliary crease 40 that has been subjected to the step-flattening process. The perforation 60 may also be provided on the front liner in addition to the back liner. The perforation 60 on the front liner is preferably provided at a position corresponding to the auxiliary crease 40 on the back liner.

<About packaging box manufacturing>
An example of assembling a packaging box 10 from a blank sheet 10B in this embodiment will be described. First, the blank sheet 10B is arranged so that the back liner is located on the upper side. Next, an item to be stored is placed on the first surface portion 11. The second surface portion 12 and the third surface portion 13 are folded around the first surface portion 11 along the first main line L1 and the second main line L2. Then, the pair of first inner flap portions 21 and the pair of second inner flap portions 23 are folded along the pair of fourth main lines L4 and the pair of sixth main lines L6. Next, the pair of first outer flap portions 31 are folded along the pair of third main lines L3 so as to overlap the first inner flap portion 21 and the second inner flap portion 23, and are bonded to the first inner flap portion 21 and the second inner flap portion 23. Furthermore, the fourth surface portion 14 is folded along the fifth main line L5 to face the first surface portion 11, and then the pair of second outer flap portions 33 are folded along the pair of seventh main lines L7 so as to overlap the first inner flap portion 21 and the second inner flap portion 23, and are bonded to the first inner flap portion 21 and the second inner flap portion 23. Finally, the fifth surface portion 15 is folded along the eighth main line L8 so as to overlap the second surface portion 12, and is bonded to the second surface portion 12, thereby assembling the packaging box 10 shown in FIG. 1. The bonding in this embodiment is performed by, for example, sticking (hot melt) with an adhesive such as a hot melt resin. In addition, the application of the adhesive in this embodiment can be performed at an appropriate timing for each bonding portion. This assembly forms a packaging box 10 having the first surface 11 as a bottom surface, the fourth surface 14 as a top surface, the second surface 12, the fifth surface 15, and the third surface 13 as length surfaces, and the pair of first inner flap portions 21, the pair of second inner flap portions 23, the pair of first outer flap portions 31, and the pair of second outer flap portions 33 as width surfaces. Here, according to the present invention, the main lines L1 to 8 are stepped and therefore easy to bend. In addition, the auxiliary lines 40 are only provided on the back liner, so that defective box making is unlikely to occur. The reason why the auxiliary lines 40 do not bend during box making is that the main lines L1 to 8 are provided on both sides of the front liner and the back liner, and therefore are easier to bend than the auxiliary lines 40. In other words, it is considered that the main lines L1 to 8 are easy to bend, so that the force applied to the box making is likely to be concentrated on the main lines L1 to 8 and is not transmitted to the auxiliary lines 40.

<Mechanism of forming chamfered portion 50>
The chamfered portion 50 is formed as follows. As shown in FIG. 1, the front liner (outside) of the packaging box 10 just produced in this embodiment has a perforation 60 corresponding to the shape of the chamfered portion 50, but the chamfered portion 50 has not yet been formed. FIG. 4 shows a plurality of produced packaging boxes 10 (three in this example) stacked up and down (see FIG. 1). Fastening bands are applied to the stacked packaging boxes 10 in the width and length directions (front-back and left-right directions in FIG. 1) (see FIG. 5). The fastening bands applied to the packaging boxes 10 come into contact with the corners of the uppermost and lowermost packaging boxes 10 as the bands are tightened. The bands that come into contact with the corners of the packaging box 10 exert a tightening force toward the inside of the packaging box 10.

At this time, as shown in FIG. 6(a), the packaging box 10 tries to disperse the tension concentrated at the corner. The tension applied to the corner travels along the surface of the packaging box 10 as shown by the solid white arrow in FIG. 6(a). The tension thus transmitted is also transmitted to the auxiliary crease 40. The step-flattened portion of the auxiliary crease 40 is easily bent by the force transmitted from the corner because the back liner is crushed toward the core. Furthermore, if the front liner or the auxiliary crease 40 has perforations 60, the stress is concentrated on the perforations 60, making it easier to bend. This causes the auxiliary crease 40 to bend. If even one of the auxiliary creases 40 is bent, the force transmitted along the surface is propagated along the auxiliary crease 40. When the auxiliary crease 40 is bent, the chamfered portion 50 rises, and at the same time, the corner returns to a flat surface as shown in FIG. 6(b). Here, when chamfered portion 50 is formed, the number of corners, which was originally only one, increases to two. By increasing the number of corners to two, the tension that was previously applied to one corner is more distributed, preventing it from digging into the packaging box. Also, the formation of chamfered portion 50 increases the contact area between the fastening band and the cardboard box, allowing for a stronger fastening. Furthermore, unlike conventional packaging boxes, no digging occurs, and the surface only becomes indented.

In contrast, with conventional packaging boxes, as shown in Figure 7, even if the tension concentrated at the corners is transmitted to the surface of the packaging box, there is no point where the stress is concentrated. As a result, when the tension concentrated at the corners exceeds a limit, the band bites into the edge, causing it to break.

The present invention will be explained in more detail below using specific configurations as examples.

A packaging box blank sheet was created based on the conditions listed in Table 〇. Containerized instant foods were placed on the blank sheet and boxes were made using an autocaser. Three packaging boxes were made for each Example and Comparative Example. The resulting packaging boxes were tested under the following conditions.

(Box making test)
The blank sheets based on Table 1 were made into boxes using an autocaser, and the box-making defects were checked from the viewpoint of box-making suitability. The criteria for box-making suitability are as follows:
◯: Using the current equipment, boxes can be made in the same way as with normal blank sheets.
△: Losses will occur with the current settings, but boxes can be made with minor adjustments.
×: Major equipment modifications would be required, and it would be difficult to combine this with normal box-making using blank sheets.

(Fastening test)
For the fastening test, packaging boxes containing containerized instant foods were stacked three high as shown in Figure 4, and fastening bands were applied in the width and length directions. The fastening bands were tightened so that they did not bend and were in close contact with the surface. At this time, it was checked whether the fastening bands were digging into the corners of the packaging box or whether any edges were cut. The judgment criteria were as follows. The results are shown in Figure 〇.
⊚: The chamfered portion is formed into the intended shape, and the fastening band does not bite into the material or the edges do not break off.
Good: The chamfer is slightly insufficiently formed, but the fastening band does not bite into the material or break off the edges. The intended function is generally functioning, and biting is unlikely to occur.
×: Biting or edge breakage of the fastening band occurs.

As is clear from Table 2, no box-making defects occurred in Examples 1 to 4. Furthermore, in the fastening test, no biting or edge cuts occurred in any of the Examples. This suggests that providing auxiliary lines on the back liner (inside of the packaging box) helps improve box-making and prevents the fastening band from biting in. Comparing Examples 1 to 4, it can be seen that while the auxiliary lines alone are sufficient to prevent the fastening band from biting in, providing perforations allows the chamfered portion to be formed in the intended shape, which is more effective in preventing the fastening band from biting in. In particular, when perforations are provided on both the front and back sides, it becomes easier to form the chamfered portion.

As explained above, in the present invention, by providing auxiliary lines on the inner surface of the packaging box, it is possible to suppress the occurrence of defective box-making during box-making, while forming a chamfered portion when fastening with a fastening band. This has the effect of preventing the fastening band from digging in and cutting the edges.

1 Packaging body 10 Packaging box 10B Blank sheet 11 First surface portion (bottom surface portion)
12 Second surface portion (one of the length surfaces)
13 Third surface portion (other longitudinal surface portion)
14 Fourth surface portion (top surface portion)
15 Fifth surface portion (side surface portion, length surface portion)
21 Pair of first inner flap portions 23 Pair of second inner flap portions 31 Pair of first outer flap portions 33 Pair of second outer flap portions 40 Auxiliary ruled line 50 Chamfered portion 60 Perforation L1 First edge (first main ruled line)
L2 Second edge (second main ruled line)
L3: A pair of third edges (third main ruled lines)
L4: A pair of fourth edges (fourth main ruled lines)
L5 Fifth edge (fifth main ruled line)
L6: A pair of sixth edges (sixth main ruled lines)
L7: A pair of seventh edges (seventh main ruled line)
L8 8th edge (8th main ruled line)

Claims (4)

A blank sheet for a packaging box is provided with a chamfered portion at the twill portion formed by two wall panels connected via a main line to prevent the edge from being cut by a logistics band.
The chamfered portion is formed by auxiliary lines provided on the mirror image side of the main line,
The main lines and the auxiliary lines are provided on the inner surface of the blank sheet,
The blank sheet has perforations on its outer surface at positions corresponding to the main ruled lines and the auxiliary ruled lines . 2. The blank sheet according to claim 1 , wherein the auxiliary ruled lines are further provided with perforations. 3. The blank sheet according to claim 1 , wherein the main and auxiliary lines are stepped, and the main lines on the inner surface of the packaging box are deeper than the main lines on the outer surface of the packaging box. A packaging box comprising the blank sheet according to any one of claims 1 to 3 .

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