JP2021195150A - Packaging box - Google Patents

Abstract

To provide a packaging box that is advantageous in suppressing deformation of a corrugated cardboard due to moisture absorption.SOLUTION: The packaging box has a wall 3 made of a corrugated cardboard 2. The corrugated cardboard 2 has an inner liner 4 facing an inside of the packaging box and an outer liner 5 facing an outside of the packaging box. The outer liner 5 has a slit 5c formed between a first edge 5a and a second edge 5b parallel to the first edge 5a. In a state where the corrugated cardboard 2 does not absorb moisture, a gap 5d is formed between the first edge 5a and the second edge 5b.SELECTED DRAWING: Figure 2

Description

This disclosure relates to packaging boxes.

The following Patent Document 1 discloses a corrugated cardboard wraparound case. The elevation plate of this wraparound case has several reverse lines in the direction perpendicular to the cut from the surface, and the side surface of the case bends inward, so that the elevation plate can be seated by the load. It suppresses the swelling of the torso that bends and swells outward.

Utility Model Registration No. 3157578 Gazette

Moisture absorption of the corrugated cardboard forming the packaging box may cause deformation such as swelling of the body. In the invention of Patent Document 1, it is difficult to suppress such deformation.

The present disclosure has been made in order to solve the above-mentioned problems, and an object of the present disclosure is to provide a packaging box which is advantageous in suppressing deformation of corrugated cardboard due to moisture absorption.

The packaging box according to the present disclosure is a packaging box having a wall made of corrugated cardboard, and the corrugated cardboard has an inner liner facing the inside of the packaging box and an outer liner facing the outside of the packaging box. The outer liner has a slit formed between the first edge and the second edge parallel to the first edge, and is between the first edge and the second edge when the corrugated board is not absorbing moisture. A gap is formed.
Further, the packaging box according to the present disclosure is a packaging box having a wall made of corrugated cardboard, and the corrugated cardboard has an inner liner facing the inside of the packaging box and an outer liner facing the outside of the packaging box. However, the outer liner comprises a slit formed between the first edge having the first end surface and the second edge having the second end surface parallel to the first end surface, and each of the first end surface and the second end surface is provided. Is slanted with respect to the surface of the outer liner.

According to the present disclosure, it is possible to provide a packaging box that is advantageous in suppressing deformation of corrugated cardboard due to moisture absorption.

It is a perspective view which shows the packaging box by Embodiment 1. FIG. It is a cross-sectional perspective view of a wall made of corrugated cardboard. FIG. 3 is a cross-sectional perspective view of a wall made of corrugated cardboard provided in the packaging box according to the second embodiment. FIG. 3 is a cross-sectional perspective view of a wall made of corrugated cardboard provided in the packaging box according to the second embodiment.

Hereinafter, embodiments will be described with reference to the drawings. The common or corresponding elements in each figure are designated by the same reference numerals to simplify or omit the description.

Embodiment 1.
FIG. 1 is a perspective view showing a packaging box 1 according to the first embodiment. The packaging box 1 shown in FIG. 1 has a wall 3 made of corrugated cardboard 2. FIG. 2 is a cross-sectional perspective view of a wall 3 made of corrugated cardboard 2. As shown in FIG. 2, the corrugated cardboard 2 has a structure in which an inner liner 4, an outer liner 5, and a core 6 are bonded to each other. The inner liner 4 faces the inside of the packaging box 1. The outer liner 5 faces the outside of the packaging box 1. The core 6 is sandwiched between the inner liner 4 and the outer liner 5. The inner liner 4 and the outer liner 5 have a flat sheet-like shape. The core 6 is formed into a corrugated shape. In the following description, the longitudinal direction of the groove-shaped recess of the corrugated core 6 is referred to as "flute direction".

The outer liner 5 has a first edge 5a, a second edge 5b, and a slit 5c. The second edge 5b extends parallel to the first edge 5a. The slit 5c corresponds to a gap formed between the first edge 5a and the second edge 5b.

The paper forming the corrugated cardboard 2 has a property of absorbing moisture in the air. The paper forming the corrugated cardboard 2 stretches when it absorbs moisture. The state after the corrugated cardboard 2 is manufactured and before the corrugated cardboard 2 absorbs moisture is hereinafter referred to as "the state in which the corrugated cardboard 2 does not absorb moisture". Generally, the water content of the corrugated cardboard 2 immediately after production is about 5% to 10%. Therefore, the state in which the water content of the corrugated cardboard 2 is in this range corresponds to the state in which the corrugated cardboard 2 does not absorb moisture.

In a state where the corrugated cardboard 2 does not absorb moisture, a gap 5d is formed between the first edge 5a and the second edge 5b. That is, in a state where the corrugated cardboard 2 does not absorb moisture, the first edge 5a is separated from the second edge 5b without being in contact with the second edge 5b, and the slit 5c forms an elongated opening.

The inner liner 4 is not separated at the position of the slit 5c, and the regions on both sides of the slit 5c are seamlessly connected. The core 6 is not separated at the position of the slit 5c, and the regions on both sides of the slit 5c are seamlessly connected.

In the following description, among the outer liners 5, the portion having the first edge 5a is referred to as "first portion 5h", and the portion having the second edge 5b is referred to as "second portion 5i". In FIG. 2, the second part 5i is located below the first part 5h, the lower side of the first part 5h corresponds to the first edge 5a, and the upper side of the second part 5i corresponds to the second edge 5b. The first edge 5a faces the second edge 5b.

As shown in FIG. 2, the width W of the gap 5d corresponds to the dimension of the gap 5d in the direction perpendicular to the longitudinal direction of the slit 5c and parallel to the surface 5e of the outer liner 5.

Since the outer liner 5 is in contact with the atmosphere outside the packaging box 1, it is easy to absorb moisture in the atmosphere when it is humid, and it is easy for elongation due to moisture absorption to occur. On the other hand, since the inner liner 4 does not come into contact with the atmosphere outside the packaging box 1, it is difficult for the inner liner 4 to absorb moisture in the atmosphere, and it is difficult for elongation due to moisture absorption to occur. Therefore, in general, when the corrugated cardboard 2 absorbs moisture when the humidity is high, the amount of elongation of the outer liner 5 becomes larger than the amount of elongation of the inner liner 4, so that the corrugated cardboard 2 warps to the outside of the packaging box 1. Tends to deform. On the other hand, in the present embodiment, since the gap 5d due to the slit 5c is formed between the first edge 5a and the second edge 5b, the elongation of the outer liner 5 due to moisture absorption deforms the corrugated cardboard 2. It can absorb the force to try. That is, when each of the first portion 5h and the second portion 5i of the hygroscopic outer liner 5 stretches, the first edge 5a and the second edge 5b approach each other, and the width W of the gap 5d decreases. At this time, since the first edge 5a and the second edge 5b do not press against each other, the elongation of the outer liner 5 due to moisture absorption can absorb the force that tends to deform the corrugated cardboard 2. As a result, it is possible to reliably suppress the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1 when the humidity is high.

In this embodiment, the first edge 5a has a first end surface 5f that is slanted with respect to the surface 5e of the outer liner 5. The second edge 5b has a second end surface 5g that is beveled with respect to the surface 5e of the outer liner 5. The second end surface 5g extends parallel to the first end surface 5f. The first end surface 5f may be parallel to the second end surface 5g. For example, by cutting the outer liner 5 so that the cut surface is slanted with respect to the surface 5e of the outer liner 5, the first end surface 5f and the second end surface 5g can be formed.

In the present embodiment, the following effects can be obtained by making the first end surface 5f and the second end surface 5g slanted with respect to the surface 5e of the outer liner 5. It is assumed that when the amount of elongation of the outer liner 5 due to moisture absorption increases, the slit 5c is completely closed and the first end surface 5f comes into contact with the second end surface 5g, and then the outer liner 5 further absorbs moisture and extends. At this time, since the first end surface 5f is displaced so as to slide with respect to the second end surface 5g, one of the first edge 5a and the second edge 5b slips under the other. As a result, the first edge 5a and the second edge 5b are prevented from being pressed against each other, so that the corrugated cardboard 2 can be more reliably suppressed from being deformed so as to warp to the outside of the packaging box 1. In the example of FIG. 2, the second edge 5b slips under the first edge 5a, but in the configuration where the first end surface 5f and the second end surface 5g are inclined in the opposite direction to this example, the second edge The first edge 5a slips under 5b.

Instead of the configuration of FIG. 2, in the present disclosure, the first end surface 5f and the second end surface 5g may be perpendicular to the surface 5e of the outer liner 5. In a configuration in which the first end surface 5f and the second end surface 5g are perpendicular to the surface 5e of the outer liner 5, even if the amount of elongation of the outer liner 5 due to moisture absorption increases, the first edge is until the slit 5c is completely closed. The 5a and the second edge 5b are not in a state of being pressed against each other. Therefore, it is possible to reliably prevent the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1.

Suppose that the first end surface 5f and the second end surface 5g are perpendicular to the surface 5e of the outer liner 5, and the first edge 5a is in contact with the second edge 5b in a state where the corrugated cardboard 2 does not absorb moisture. When the moisture-absorbed outer liner 5 is stretched, the first edge 5a and the second edge 5b are pressed against each other, so that the force due to the stretching of the outer liner 5 cannot be absorbed. Therefore, it is not possible to prevent the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1 when it absorbs moisture.

In the present embodiment, the slit 5c extends linearly along a direction perpendicular to the flute direction. As a result, it is possible to more reliably suppress the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1 when absorbing moisture. However, in the present disclosure, the slit 5c may extend in a direction oblique to the flute direction, or the slit 5c may extend parallel to the flute direction. Further, a part or all of the slit 5c may extend in a curved or polygonal line.

In the illustrated example, when the packaging box 1 is placed on a horizontal floor surface, the flute direction of the wall 3 provided with the slit 5c is parallel to the vertical line. Not limited to this example, when the packaging box 1 is placed on a horizontal floor surface, the flute direction of the wall 3 provided with the slit 5c may be horizontal.

As shown in FIG. 1, the packaging box 1 of the present embodiment has a rectangular parallelepiped outer shape. In the present embodiment, the slit 5c is provided in the wall 3 perpendicular to the bottom surface 8 of the packaging box 1. The deformation of the wall 3 perpendicular to the bottom surface 8 of the packaging box 1 so as to warp outward of the packaging box 1 is hereinafter referred to as “body swelling”. In the present embodiment, by providing the slit 5c on the wall 3 perpendicular to the bottom surface 8 of the packaging box 1, it is possible to reliably suppress the occurrence of body swelling when the corrugated cardboard 2 absorbs moisture.

If even a small amount of body swelling occurs, the vibrations generated during transportation cause the surfaces of the walls 3 of the packaging boxes 1 stacked next to each other to rub against each other, and the printing on the surface of the walls 3 rubs against each other, resulting in a defective product. May be treated as. Further, when the packaging boxes 1 are stacked in a plurality of stages, the lower packaging box 1 may be compressed by the load of the packaging boxes 1 stacked on the packaging boxes 1 and the swelling of the body may be expanded. be. On the other hand, in the present embodiment, since the occurrence of body swelling can be reliably suppressed, the occurrence of the above-mentioned adverse effects can be reliably prevented.

When the humidity is high, the inner liner 4 also absorbs some moisture, so that the inner liner 4 also undergoes some elongation. At this time, since the elongation of the outer liner 5 is absorbed by the slit 5c, the elongation action of the inner liner 4 becomes larger than the elongation action of the outer liner 5, and as a result, the corrugated cardboard 2 is placed inside the packaging box 1. There is a possibility of warping and inward warping. In the following description, the fact that the wall 3 perpendicular to the bottom surface 8 of the packaging box 1 is in an inwardly warped state is referred to as a “body dent”. In the present embodiment, the corrugated cardboard 2 is in a dented state when it absorbs moisture, so that it is possible to more reliably prevent the surfaces of the walls 3 of the adjacent packaging boxes 1 from rubbing against each other during transportation. Further, if the packaging box 1 is in a recessed state before being stacked in a plurality of stages, the cylinder swelling is more likely to occur due to the compression load in the vertical direction when the packaging box 1 is stacked in the plurality of stages. It can be surely prevented.

The packaging box 1 has four walls 3 perpendicular to the bottom surface 8. In the present embodiment, slits 5c are provided on each of the four walls 3. As a result, it is possible to more reliably suppress the occurrence of body swelling when the corrugated cardboard 2 absorbs moisture. However, in the present disclosure, it is not necessary that the slit 5c is provided in a part of the four walls 3 perpendicular to the bottom surface 8 and the slit 5c is not provided in the remaining wall 3.

In the present embodiment, only one slit 5c is provided on one surface of the packaging box 1. This is more advantageous in increasing the strength of the packaging box 1. However, in the present disclosure, a plurality of parallel slits 5c may be provided on one surface of the packaging box 1.

The length L of the wall 3 in FIG. 1 corresponds to the length of the wall 3 in the same direction as the width W of the gap 5d. In the present embodiment, the length L of the wall 3 corresponds to the dimension in the direction perpendicular to the bottom surface 8 of the packaging box 1.

As the amount of moisture absorbed by the corrugated cardboard 2 increases, the width W of the gap 5d decreases, and the slit 5c gradually closes. If the width W of the gap 5d in the state where the corrugated cardboard 2 does not absorb moisture is too small with respect to the length L of the wall 3, the width W of the gap 5d becomes zero when the amount of moisture absorbed by the corrugated cardboard 2 increases. The first edge 5a and the second edge 5b may touch each other. If the corrugated cardboard 2 further absorbs moisture after that, the first edge 5a and the second edge 5b are in a state of being pressed against each other, and it becomes difficult to absorb the force due to the elongation of the outer liner 5, and the corrugated cardboard 2 is on the outside of the packaging box 1. It may be more difficult to suppress the deformation so as to warp. From the viewpoint of surely preventing such a situation, the width W of the gap 5d in the state where the corrugated cardboard 2 does not absorb moisture is preferably 0.5% or more of the length L of the wall 3, and the wall 3 has a width W of 0.5% or more. It is more preferably 0.6% or more of the length L, and most preferably 0.7% or more of the length L of the wall 3. The amount of elongation of the outer liner 5 when the corrugated cardboard 2 absorbs moisture is about 1% at the maximum. Therefore, if the ratio of the width W of the gap 5d to the length L of the wall 3 in the state where the corrugated cardboard 2 does not absorb moisture is equal to or more than the above value, the first edge 5a and the first edge 5a when the corrugated cardboard 2 absorbs moisture. Since it is possible to more reliably avoid the two edges 5b from being pressed against each other, it is possible to more reliably suppress the corrugated cardboard 2 from being deformed so as to warp outward from the packaging box 1.

The width W of the gap 5d in the state where the corrugated cardboard 2 does not absorb moisture is preferably 2% or less of the length L of the wall 3, and more preferably 1.5% or less of the length L of the wall 3. Most preferably, it is 1.2% or less of the length L of the wall 3. If the ratio of the width W of the gap 5d to the length L of the wall 3 in the state where the corrugated cardboard 2 does not absorb moisture is equal to or less than the above value, there are the following advantages. The slit 5c is inconspicuous in the appearance of the packaging box 1. In particular, as the corrugated cardboard 2 absorbs moisture and the slit 5c closes, the slit 5c becomes less noticeable. It is possible to more reliably prevent foreign matter such as dust or insects from entering between the outer liner 5 and the core 6 from the slit 5c.

The packaging box 1 may be configured such that the first end surface 5f of the first edge 5a is in contact with the second end surface 5g of the second edge 5b and the slit 5c is completely closed when the humidity is high. When the corrugated cardboard 2 absorbs moisture and is humid, the strength of the corrugated cardboard 2 decreases, but at that time, the slit 5c is in a completely closed state, so that the decrease in the strength of the corrugated cardboard 2 can be reliably suppressed and the slit 5c is inconspicuous. It becomes possible to do so. For example, the width W of the gap 5d when the corrugated cardboard 2 is not absorbing moisture is 0.7% or more of the length L of the wall 3 and 1.2% or less of the length L of the wall 3. This makes it possible to make the slit 5c just closed when the humidity is high.

As shown in FIG. 2, the packaging box 1 of the present embodiment has a protective sheet 7 that covers the slit 5c. The protective sheet 7 is attached to the surface 5e of the outer liner 5. In the present embodiment, by providing the protective sheet 7, foreign matter such as dust or insects is more reliably prevented from entering between the outer liner 5 and the core 6 from the slit 5c. can. Further, the slit 5c is covered with the protective sheet 7 and becomes invisible, so that the appearance of the packaging box 1 is improved.

In the illustrated example, the protective sheet 7 has a strip-like shape extending elongated along the slit 5c. The width of the protective sheet 7 is larger than the width W of the gap 5d in the state where the corrugated cardboard 2 does not absorb moisture. As a result, the protective sheet 7 can close the entire gap 5d. The protective sheet 7 may be made of paper or resin, for example.

It is preferable that the protective sheet 7 is fixed to either one of the first portion 5h and the second portion 5i with, for example, an adhesive, and is not fixed to any one of them. As a result, the following effects can be obtained. When the width W of the gap 5d is reduced in high humidity, it is possible to more reliably prevent the protective sheet 7 from loosening. When the width W of the gap 5d is reduced during high humidity, it is possible to more reliably prevent the first edge 5a and the second edge 5b from being pressed against each other via the protective sheet 7.

The packaging box 1 of the present disclosure may not have the protective sheet 7 as described above.

As shown in FIG. 1, the packaging box 1 has a first ridge line 3a at one end of one wall 3 and a second ridge line 3b at the other end of the wall 3. The slit 5c in the present embodiment is continuously formed from the position of the first ridge line 3a to the position of the second ridge line 3b. As a result, it is possible to more reliably suppress the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1 when the humidity is high.

The distance between the first ridge line 3a and the second ridge line 3b is defined as the inter-ridge line distance DR. In the illustrated example, the first ridge 3a and the second ridge 3b are perpendicular to the bottom surface 8. The distance between the ridges DR is a distance in the direction parallel to the bottom surface 8. In this embodiment, the slit 5c extends parallel to the bottom surface 8. As a result, the slit 5c can connect the first ridge line 3a and the second ridge line 3b at the shortest distance, which is more advantageous in suppressing the decrease in strength of the packaging box 1 due to the slit 5c.

Instead of the illustrated example, the slit 5c may be formed intermittently from the position of the first ridge line 3a to the position of the second ridge line 3b. This "intermittent" corresponds to, for example, the slit 5c being formed so as to form a broken line. Further, the slit 5c may be formed continuously or intermittently from a position near the first ridge line 3a to a position near the second ridge line 3b. Even in these cases, it is possible to more reliably suppress the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1 when the humidity is high. A position where the distance from the first ridge line 3a is, for example, 5 cm or less corresponds to a position near the first ridge line 3a. A position where the distance from the second ridge line 3b is, for example, 5 cm or less corresponds to a position near the second ridge line 3b.

With respect to one wall 3, the total length of the slit 5c in the direction parallel to the inter-ridge line distance DR is preferably 50% or more of the inter-ridge line distance DR, and more preferably 70% or more of the inter-ridge line distance DR. , 90% or more of the distance between ridges DR is most preferable. When the total length of the slit 5c satisfies the above ratio, it is possible to more reliably suppress the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1 when the humidity is high. When the slits 5c are formed intermittently, the total length of the plurality of short slits 5c arranged intermittently can be regarded as the "total length of the slits 5c".

In the present embodiment, the inner liner 4 does not have a cut like the slit 5c. By configuring the inner liner 4 so as not to have a break, it is more advantageous to sufficiently increase the strength of the packaging box 1. However, in the present disclosure, the inner liner 4 may have a cut. In that case, it is desirable that the total length of the cut of the inner liner 4 is shorter than the total length of the slit 5c.

In the present embodiment, the core 6 does not have a cut like the slit 5c. By configuring the core 6 so as not to have a break, it is more advantageous to sufficiently increase the strength of the packaging box 1. However, in the present disclosure, the core 6 may have a cut. In that case, it is desirable that the total length of the cut of the core 6 is shorter than the total length of the slit 5c.

In the present disclosure, the position where the slit 5c is provided is not limited to the illustrated example, and for example, the slit 5c is provided on the corrugated cardboard 2 forming a wall other than the wall 3 perpendicular to the bottom surface 8. May be good. For example, the corrugated cardboard 2 forming the wall of the bottom surface 8 of the packaging box 1 may be provided with the slit 5c, or the corrugated cardboard 2 forming the wall of the upper surface 9 of the packaging box 1 may be provided with the slit 5c. ..

Further, the packaging box of the present disclosure is not limited to a box having a rectangular parallelepiped outer shape. For example, the packaging box of the present disclosure may have a columnar or prismatic outer shape.

In the present embodiment, the corrugated cardboard 2 may correspond to, for example, any of A flute, B flute, E flute, and G flute. However, the corrugated cardboard 2 in the present disclosure is not limited to these, and for example, like AAA flute, AA flute, AB flute, etc., a core of a plurality of layers is provided between the inner liner 4 and the outer liner 5. 6 may be provided with a center liner (not shown) sandwiched between the core 6 and the core 6. In that case, it is preferable that the middle liner does not have a cut such as a slit 5c. By configuring the middle liner so as not to have a break, it is more advantageous to sufficiently increase the strength of the packaging box 1. However, in the present disclosure, the middle liner may have a cut. In that case, it is desirable that the total length of the cut of the middle liner is shorter than the total length of the slit 5c.

Embodiment 2.
Next, the second embodiment will be described with reference to FIGS. 3 and 4, but the differences from the above-described first embodiment will be mainly described, and the elements common to or corresponding to the above-mentioned elements will be described. The same reference numerals are used to simplify or omit common descriptions.

3 and 4 are cross-sectional perspective views of a wall 3 made of corrugated cardboard 2 provided in the packaging box according to the second embodiment. FIG. 3 shows a state in which the corrugated cardboard 2 does not absorb moisture. FIG. 4 shows a state in which the corrugated cardboard 2 has absorbed moisture.

As shown in FIG. 3, each of the first end surface 5f of the first edge 5a and the second end surface 5g of the second edge 5b is slanted with respect to the surface 5e of the outer liner 5. The first end surface 5f faces the second end surface 5g. The first end surface 5f may be parallel to the second end surface 5g. In the cross section perpendicular to the longitudinal direction of the slit 5c, each of the first edge 5a and the second edge 5b exhibits a wedge-shaped shape. For example, the cut surface formed by cutting the outer liner 5 diagonally with respect to the surface 5e of the outer liner 5 may form the first end surface 5f and the second end surface 5g.

As shown in FIG. 4, when the corrugated cardboard 2 absorbs moisture and the outer liner 5 stretches when the humidity is high, the first end surface 5f slides with respect to the second end surface 5g. As a result, the second edge 5b slips under the first edge 5a, and between the outer liner 5 and the core 6 of the portion where the first edge 5a is formed, the outside of the portion where the second edge 5b is formed. The liner 5 enters. In such a state, the action of the outer liner 5 to bend the corrugated cardboard 2 outward is reduced, so that the corrugated cardboard 2 is surely deformed so as to warp outward of the packaging box 1. Can be suppressed.

The back surface of the outer liner 5 is the surface opposite to the surface 5e. The back surface of the outer liner 5 is adhered to the core 6. A part of the back surface of the outer liner 5 on which the first edge 5a is formed is a non-adhesive portion 5j that is not adhered to the core 6. As a result, when the outer liner 5 is stretched when the humidity is high, the second edge 5b can be more smoothly and surely inserted between the non-adhesive portion 5j and the core 6. As a result, it is possible to more reliably suppress the corrugated cardboard 2 from being deformed so as to warp to the outside of the packaging box 1.

As shown in FIG. 4, when the outer liner 5 is stretched when the humidity is high, the width of the portion where the outer liner 5 in the portion where the first edge 5a is formed and the outer liner 5 in the portion where the second edge 5b is formed overlap each other. Changes according to the amount of elongation of the outer liner 5. Since the amount of elongation of the outer liner 5 due to moisture absorption is about 1% at the maximum, the width corresponds to about 1% of the amount of elongation of the outer liner 5 at the maximum. The non-adhesive width NB in FIG. 3 corresponds to the dimension of the non-adhesive portion 5j in the direction perpendicular to the longitudinal direction of the slit 5c and parallel to the surface 5e of the outer liner 5. The non-adhesive width NB is preferably 1% or more of the length L of the wall 3 in FIG. If the non-adhesive width NB satisfies the above ratio, the second edge 5b can be reliably inserted between the non-adhesive portion 5j and the core 6 even when the elongation amount of the outer liner 5 is maximized. ..

However, in the present disclosure, the non-adhesive portion 5j may not be provided. Even if the non-adhesive portion 5j is not provided, the wedge-shaped second edge 5b enters under the first edge 5a, so that the back surface of the outer liner 5 at that portion is peeled off from the core 6.

In the illustrated example, the first end surface 5f is in contact with the second end surface 5g in the state of FIG. 3 in which the corrugated cardboard 2 does not absorb moisture. That is, in the state of FIG. 3 in which the corrugated cardboard 2 does not absorb moisture, there is no gap between the first edge 5a and the second edge 5b. Therefore, even if the protective sheet 7 is not provided, it is possible to more reliably prevent foreign matter such as dust or insects from entering between the outer liner 5 and the core 6 from the slit 5c.

In the present embodiment, instead of the illustrated example, in a state where the corrugated cardboard 2 does not absorb moisture, the first end surface 5f is not in contact with the second end surface 5g, and is between the first edge 5a and the second edge 5b. There may be a gap in the space. In that case, the protective sheet 7 may be provided.

As a modification of the present embodiment, the inclination of the first end surface 5f and the second end surface 5g with respect to the surface 5e of the outer liner 5 may be opposite to the illustrated example. In this modification, when the outer liner 5 is stretched when the humidity is high, the first edge 5a slips under the second edge 5b. In this modification, the non-adhesive portion 5j is provided on the back surface of the outer liner 5 in the portion where the second edge 5b is formed.

1 packaging box, 2 cardboard, 3 walls, 3a first ridge, 3b second ridge, 4 inner liner, 5 outer liner, 5a first edge, 5b second edge, 5c slit, 5d gap, 5e surface, 5f first End face, 5g 2nd end face, 5h 1st part, 5i 2nd part, 5j non-adhesive part, 6 core, 7 protective sheet, 8 bottom, 9 top

Claims (13)

A packaging box with walls made of cardboard
The corrugated cardboard has an inner liner facing the inside of the packaging box and an outer liner facing the outside of the packaging box.
The outer liner has a slit formed between the first edge and the second edge parallel to the first edge.
A packaging box in which a gap is formed between the first edge and the second edge when the corrugated cardboard does not absorb moisture. The packaging according to claim 1, wherein the width of the gap in a direction perpendicular to the longitudinal direction of the slit and parallel to the surface of the outer liner is 0.5% or more of the length of the wall in the direction. box. The packaging box according to claim 2, wherein the width of the gap is 2% or less of the length of the wall. A packaging box with walls made of cardboard
The corrugated cardboard has an inner liner facing the inside of the packaging box and an outer liner facing the outside of the packaging box.
The outer liner comprises a slit formed between a first edge having a first end face and a second edge having a second end face parallel to the first end face.
A packaging box in which each of the first end surface and the second end surface is slanted with respect to the surface of the outer liner. The packaging box according to claim 4, wherein the first end surface is in contact with the second end surface in a state where the corrugated cardboard does not absorb moisture. Further provided with a core bonded to the back surface of the outer liner,
The packaging according to claim 4 or 5, wherein the first edge or a part of the back surface of the outer liner on which the second edge is formed is a non-adhesive portion that is not adhered to the core. box. The packaging box has a first ridge at one end of the wall and a second ridge at the other end of the wall.
Any of claims 1 to 6, wherein the slit is formed continuously or intermittently from the position of the first ridge line or a position near the first ridge line to the position of the second ridge line or a position near the second ridge line. The packaging box described in paragraph 1. The packaging box according to any one of claims 1 to 7, wherein a protective sheet covering the slit is attached to the surface of the outer liner. The outer liner comprises a first site having the first edge and a second site having the second edge.
The packaging box according to claim 8, wherein the protective sheet is fixed to either one of the first part and the second part and is not fixed to any one of the other parts. The packaging box according to any one of claims 1 to 9, wherein the slit is provided in the wall perpendicular to the bottom surface of the packaging box. The packaging box according to any one of claims 1 to 9, wherein the slits are provided in each of the four walls perpendicular to the bottom surface of the packaging box. The packaging box according to claim 10 or 11, wherein the slit extends parallel to the bottom surface. The packaging box according to any one of claims 1 to 12, wherein only one slit is provided on one surface of the packaging box.

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