Packaging boxes and blank sheets

Abstract

To provide a packaging box made of corrugated paper that has improved aesthetics, can form a beautiful opening, can increase a support strength of a side wall, and can suppress bulge deformation when loaded, at the opening when opening the package box.SOLUTION: There is provided a packaging box 1 having an opening forming part 3 capable of forming an opening 30 made of corrugated paper 20, the opening forming part 3 including: a liner cut portion 31 in which a linear continuous or discontinuous cutting line is provided on a back liner 20b along a position where the opening 30 is formed; an opening start end 35 provided at least at one end of the liner cut portion 31; and an inclined cut part 33 provided by cutting all or one of a front liner 20b, a center core 20c, and a back liner 20b that are placed on an article storage portion 11 side when the opening 30 is formed around the one end side of the liner cut portion 31, so as to spread toward the opening start end 35.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging box made of cardboard paper and a blank sheet made of cardboard paper for assembling and constructing the packaging box.

Background Art

[0002] Conventionally, several cardboard paper-made packaging boxes having an opening forming portion capable of forming an opening have been proposed and put into practice, which can be used as a tray for opening the upper part and displaying it at a storefront or the like while storing internal articles to be goods in the lower part.

[0003] For example, Patent Document 1 discloses a cardboard paper-made packaging box including an operation portion provided on a side wall portion, an auxiliary bending line that extends inward and upward obliquely from left and right side portions of the side wall portion toward the operation portion, a first breaking line that extends from the operation portion toward an outer end portion in the left and right direction of the auxiliary bending line, and a second breaking line that extends from an end portion of the first breaking line to a leading edge of a second side wall portion continuously provided to the side wall portion or an upper end edge of the side wall portion.

[0004] However, in this packaging box, the first and second break lines are formed by alternating full-cut sections, where the entire outer liner, core, and inner liner, which are bonded together, are cut, and half-cut sections, where at least the outer liner is left intact. Therefore, in order to improve the aesthetics and create a clean opening when the box is opened, the pitch between full-cut sections must be made extremely small, and the overall cut depth increased, in order to ensure that the core and outer liner do not tear in the direction of the deviation at the half-cut section and that the cut is securely made to the next full-cut section. Consequently, in this packaging box, coupled with the presence of auxiliary fold curves, the support strength of the side walls becomes very small. Now, this type of packaging box is usually transported stacked in multiples on the back of a truck, etc. Therefore, in this type of packaging box, if the items stored inside are relatively heavy, such as PET bottles filled with beverages, the lower boxes in a stacked state must bear a greater load. Therefore, because the support strength of the side walls of this packaging box is very low, the side walls will deform significantly, especially for items stacked on the bottom, potentially causing the lower part, which can be used as a tray after opening, to deform considerably and ruin its appearance. Moreover, this packaging box can place a heavy load on the contents inside, such as PET bottles, potentially causing quality deterioration such as deformation. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2014-37254 [Overview of the project] [Problems that the invention aims to solve]

[0006] Therefore, the present invention was devised in view of the above-mentioned problems, and its objective is to provide a corrugated cardboard packaging box and a corrugated cardboard blank sheet for assembling this packaging box, which improves the aesthetic appearance of the opening when opened, allows for the formation of a clean opening, increases the support strength of the side walls, and suppresses internal deformation when stacked. [Means for solving the problem]

[0007] The packaging box according to the first invention is a packaging box made of corrugated cardboard having an opening forming portion that can form an opening, the opening forming portion comprising: a front liner that forms the outer surface, a core of reinforcing material, and a back liner that forms the inner surface, the opening forming portion comprising: a liner cut portion having linear continuous or discontinuous cutting lines provided in the back liner along the position where the opening is formed; an opening start end provided at at least one end of the liner cut portion; and an inclined cut portion provided around at least one end of the liner cut portion on the side of the article storage portion when the opening is formed, by cutting any or both of the front liner, the core, and the back liner so as to widen toward the opening start end. A second liner cut portion is provided at a position opposite to the position where the opening is formed, with linearly continuous or discontinuous cutting lines provided in the back liner, which is spaced apart on the side of the liner cut portion; a second inclined cut portion is provided at least around the end of the second liner cut portion on the sealing portion side where the opening is formed, by cutting any or both of the front liner, the core, and the back liner so as to widen toward the opening start end; and the inclined cut portion and the second inclined cut portion are arranged substantially symmetrically with respect to the center line between the liner cut portion and the second liner cut portion, with respect to the center line between the liner cut portion and the second liner cut portion, only the one closest to the opening start end. It is characterized by the following.

[0008] The packaging box according to the second invention is, A packaging box made of corrugated cardboard having an opening-forming section capable of forming an opening, the opening-forming section having a liner cut section in which a linear continuous or discontinuous cutting line is provided in the back liner along the position where the opening is formed, an opening start end provided at at least one end of the liner cut section, and at least around the one end side of the liner cut section, on the side of the article storage section when the opening is formed, the liner cut section, the back liner, and the back liner, or any one thereof, extending toward the opening start end The liner cut portion is provided, and a second liner cut portion is provided at a position opposite to the position where the opening is formed, with linearly continuous or discontinuous cutting lines provided in the back liner which is spaced apart on the side of the liner cut portion, and a second liner cut portion is provided at least around the end of the second liner cut portion on the sealing portion side when the opening is formed, by cutting any or both of the front liner, the core, and the back liner so as to spread toward the opening start end, and the opening start end, the liner cut portion and the second liner cut portion are connected. It is characterized by the following.

[0011] The 3 The packaging box according to the invention is, First or second invention In this configuration, the inclined cut portion and the second inclined cut portion are arranged in a staggered pattern with respect to the center line between the liner cut portion and the second liner cut portion.

[0013] The 4 The packaging box according to the invention is, 2 In the invention, the inclined cut portion and the second inclined cut portion are arranged in a substantially symmetrical manner with respect to the center line between the liner cut portion and the second liner cut portion.

[0015] The 5 The packaging box according to the invention is the first invention. or second invention The present invention is characterized by having multiple opening-forming portions at the position where the opening is formed.

[0017] The 6 The blank sheet relating to the invention is the first invention. or second invention It is characterized by being a blank sheet made of corrugated cardboard used to assemble and construct a packaging box. [Effects of the Invention]

[0018] First Invention ~ 5 According to the packaging box of the invention, when opened, if it is torn from the opening end, the outer liner and core will tear because there are no liner cut sections on the outer liner and core. However, since there is an inclined cut section that cuts at least one of the outer liner, core, and back liner which are bonded together, even if the tear is deflected, it is caught by the inclined cut section and guided back to the liner cut section, thereby reducing the area that is torn. 5 According to the packaging box of the invention, the aesthetic appearance of the opening is improved, and a beautiful opening can be formed. Furthermore, the first to third inventions 5 According to the present invention, the amount of cut in the opening-forming portion can be reduced, thereby increasing the support strength of the side wall, reducing the bulging deformation of the side wall when transporting multiple boxes stacked on top of each other, suppressing significant deformation of the lower part used for storing articles after opening, and also suppressing deterioration of the quality of the articles inside.

[0020] In particular, 1 According to the present invention, a second liner cut section is provided opposite the position where the opening is formed, and the back liner is spaced apart on the side of the liner cut section, with linear continuous or discontinuous cutting lines provided on the back liner. Therefore, when opening, the opening can be formed neatly with less force by cutting between the liner cut section and the second liner cut section.

[0021] In particular, according to the packaging box according to the 1 invention, when opened, if it is broken from the opening start end portion, since the second liner cut portion is not provided in the surface liner and the core, the surface liner and the core are torn, but at least any one of the surface liner, the core, and the back liner that are bonded to each other is provided with a second inclined cut portion that is cut, so even if the tear deviates, it is received by the second inclined cut portion and guided back to the second liner cut portion, thereby reducing the torn area. Thus, according to the 1 invention, the packaging box can improve the beauty property at the opening and form a beautiful opening.

[0022] In particular, according to the 3 invention, the inclined cut portion and the second inclined cut portion are provided in a staggered arrangement with respect to the center line between the liner cut portion and the second liner cut portion. Therefore, the inclined cut portion does not need to be directly below the second inclined cut portion, and the support strength of the side wall portion can be increased. For this reason, according to the 1 invention, when transporting in a state where a plurality of them are stacked, the middle swelling deformation of the side wall portion can be reduced, and a large deformation of the article storage portion at the lower part that can be used after opening can be suppressed, and the deterioration of the quality of the articles inside can also be suppressed, enhancing the effect.

[0023] In particular, according to the 1 invention, the inclined cut portion and the second inclined cut portion are provided in a substantially line-symmetric arrangement with respect to the center line between the liner cut portion and the second liner cut portion only for the ones closest to the opening start end portion. Therefore, at the start of opening, from the opening start end portion, it is guided and cut forward in a well-balanced manner by the inclined cut portion and the second inclined cut portion closest to the opening start end portion, and a beautiful opening can be formed with an even smaller force.

[0024] In particular, according to the 3According to the packaging box according to the invention, since the inclined cut portion and the second inclined cut portion are provided in a substantially line-symmetric arrangement with respect to the center line between the liner cut portion and the second liner cut portion, overall, an opening can be formed neatly with a smaller force. However, the 3 In the packaging box according to the invention, compared with the case where the inclined cut portion and the second inclined cut portion are provided in a staggered arrangement with respect to the center line between the liner cut portion and the second liner cut portion, the support strength of the side wall portion is slightly reduced. Therefore, it is particularly suitable for using a corrugated paper with higher strength or for storing relatively light articles inside.

[0025] Particularly, the 2 According to the packaging box according to the invention, since the opening start end portion is connected to the inclined cut portion and the second inclined cut portion, only a smaller force is required at the start of opening, and an opening can be formed neatly with an even smaller force with even more ease.

[0026] Particularly, the 5 According to the packaging box according to the invention, since it has a plurality of opening forming portions with respect to the position where the opening is formed, for example, the plurality of opening forming portions can be advanced simultaneously with both hands, and the opening operation can be performed more efficiently.

[0028] The 6 According to the blank sheet according to the invention, it can be a blank sheet for assembling and constructing a packaging box that exhibits the effects of the above-described first invention. and the second invention

Brief Description of the Drawings

[0029] [Figure 1] FIG. 1(a) is a perspective view of a packaging box according to an embodiment of the present invention, and FIG. 1(b) is a partially enlarged cross-sectional view of the corrugated paper used for the packaging box of FIG. 1(a). [Figure 2] FIG. 2 is a plan view showing a blank sheet used in an embodiment of the present invention. [Figure 3] FIG. 3 is a partially enlarged view of an opening forming portion of a packaging box according to an embodiment of the present invention. [Figure 4] Figure 4 is a partially enlarged view of the opening forming portion of a packaging box according to another embodiment of the present invention. [Figure 5] Figure 5 is a partially enlarged view of the area around the opening start end of the opening formation portion of a packaging box according to another embodiment of the present invention. [Figure 6] Figure 6 is a side view showing the packaging box from Figure 1(a) after it has been opened and the sealing portion has been removed. [Modes for carrying out the invention]

[0030] The embodiments illustrated below, applying the present invention, will be described with reference to the drawings.

[0031] [Embodiment] Figure 1(a) is a perspective view of a packaging box 1 according to an embodiment of the present invention, and Figure 1(b) is a partially enlarged cross-sectional view of the corrugated cardboard 20 used in the packaging box 1 of Figure 1(a). Figure 2 is a plan view showing a blank sheet 2 used in an embodiment of the present invention. Figure 3 is a partially enlarged view of the opening forming portion 3 of the packaging box 1 according to an embodiment of the present invention. Figure 4 is a partially enlarged view of the opening forming portion 3 of a packaging box according to another embodiment of the present invention. Figure 5 is a partially enlarged view of the area around the opening start end 35 in the opening forming portion 3 of a packaging box according to another embodiment of the present invention. Figure 6 is a side view showing the packaging box 1 of Figure 1(a) opened and the sealing portion 12 removed.

[0032] As shown in Figures 1(a) and 1(b), the packaging box 1 has an opening forming section 3 that can form an opening 30 made of corrugated cardboard 20, which is composed of a front liner 20a forming the outer surface, a reinforcing core 20c, and a back liner 20b forming the inner surface, all of which are bonded together by a bonding process (see also Figure 6).

[0033] This packaging box 1 is constructed by assembling a single blank sheet 2 made of corrugated cardboard 20, as shown in Figure 2.

[0034] Specifically, the base plate portion and the long-side wall portion are formed by folding the side wall plates 22A and 22B adjacent to the base plate 21 at approximately right angles.

[0035] Next, the top panel 23 adjacent to the side panel 22B is folded at approximately a right angle, and the connecting panel 26 adjacent to the side panel 22A is also folded at approximately a right angle. The connecting panel 26 is then attached to the portion of the top panel 23 indicated by the shaded lines using adhesive or the like, thereby forming the top panel section.

[0036] Finally, the side wall forming plates 24A, 24A adjacent to the side wall plate 22A, and the side wall forming plates 24B, 24B adjacent to the side wall plate 22B are each folded at approximately right angles, and the side wall forming plates 25A, 25A adjacent to the top plate 23, and the side wall forming plates 25B, 25B adjacent to the bottom plate 21 are each folded at approximately right angles, and the overlapping parts of these are connected with adhesive or the like to form the side wall on the short side, thereby assembling the packaging box 1.

[0037] Furthermore, at a height midway between the long and short side walls of the packaging box 1, four opening-forming sections 3 are provided to open the upper sealing section 12 from the lower article storage section 11 when the box is opened, forming an opening 30.

[0038] In this embodiment, the opening forming portion 3 is designed to completely remove the sealing portion 12, but the invention is not limited to this, and the sealing portion 12 may be left in a flap-like shape.

[0039] Specifically, the opening forming section 3 comprises a liner cutting section 31, a second liner cutting section 32, an opening start end section 35, an inclined cutting section 33, and a second inclined cutting section 34.

[0040] The liner cut section 31 is provided by perforations in the back liner 20b along the position where the opening 30 is formed, as shown by the dashed lines in Figures 1 to 3 (see also Figure 6). Note that the liner cut section 31 is not limited to perforations, but can be provided with discontinuous linear cutting lines. Also, since the liner cut section 31 is provided only in the back liner 20b fixed to the core 20c, it is not limited to discontinuous cutting lines, but can be provided with continuous cutting lines.

[0041] Furthermore, in this embodiment, as shown in Figures 1 and 2, the liner cut section 31 is provided continuously on the long side wall and the left and right short side walls, taking ease of construction into consideration. However, it may also be provided only on the long side wall or only on the left and right short side walls.

[0042] The second liner cut section 32 is provided with perforations parallel to the back liner 20b at a position opposite to the position where the opening 30 is formed, as shown by the dashed lines in Figures 1 to 3. The second liner cut section 32 is not limited to perforations; it can also be provided with discontinuous linear cutting lines. Furthermore, since the second liner cut section 32 is provided only on the back liner 20b fixed to the core 20c, it is not limited to discontinuous cutting lines; it can also be provided with continuous cutting lines. In addition, the second liner cut section 32 does not necessarily have to be parallel to the liner cut section 31; it is sufficient if continuous or discontinuous linear cutting lines are provided on the back liner 20b, which are spaced apart on the side of the liner cut section 31.

[0043] Furthermore, in this embodiment, as shown in Figures 1 and 2, the second liner cut section 32 is also provided continuously on the long side wall and the left and right short side walls, taking ease of construction into consideration. However, it may also be provided only on the long side wall or only on the left and right short side walls.

[0044] As shown in Figures 1 to 3, the opening start end 35 is formed by discontinuously cutting the front liner 20a, the core 20c, and the back liner 20b so that they are adjacent to each other in a U-shape and an inverted U-shape, respectively, in the central part of the liner cut section 31 and the second liner cut section 32, that is, in the central part of the side wall on the long side, and the whole thing forms a roughly H shape.

[0045] This overall H-shaped design has two adjacent opening ends 35 on the left and right, each allowing a finger to be inserted.

[0046] Furthermore, the perforations forming the liner cut portion 31 and the second liner cut portion 32 in the area enclosed by the opening start end portion 35 are provided with ease of installation in mind, as described above, and may be omitted.

[0047] In other words, the opening start end 35 is provided at one end on the left or right of the liner cut section 31 and the second liner cut section 32, respectively. The other end of the liner cut section 31 and the second liner cut section 32 is the edge of the inspection hole 4 for the article G, which is formed in the side wall on the short side, as will be described later.

[0048] As shown in Figures 1 to 3, the inclined cut sections 33 are provided at approximately equal intervals from the vicinity of one end of the liner cut section 31 where the opening start end 35 is provided to the other end. Furthermore, when the opening 30 is formed, multiple inclined cut sections 33 are provided on the article storage section 11 side where the article G is stored, by cutting into the outer liner 20a, the core 20c, and the inner liner 20b so as to widen toward the opening start end 35. Note that the inclined cut sections 33 may be short in length, for example, about 4 mm. It is also most preferable that the inclined cut sections 33 be provided at a 45° angle to the liner cut section 31. In addition, the inclined cut sections 33 are not limited to a straight line as shown, but may be implemented in other shapes such as an arc, as long as they widen toward the opening start end 35. Furthermore, in this embodiment, the inclined cut portion 33 is cut with respect to the outer liner 20a, the core 20c, and the inner liner 20b, but it may also be implemented by cutting at least one of the outer liner 20a, the core 20c, and the inner liner 20b. Specifically, the inclined cut portion 33 may be implemented by cutting only the outer liner 20a and not the core 20c and the inner liner 20b, or by cutting the outer liner 20a and the core 20c and not the inner liner 20b. Moreover, in this embodiment, the inclined cut portion 33 is positioned slightly away from the liner cut portion 31, but it is not limited to this, and may be implemented so as to be connected to the liner cut portion 31.

[0049] As shown in Figures 1 to 3, the second inclined cut sections 34 are provided at approximately equal intervals from the vicinity of one end of the second liner cut section 32 where the opening start end 35 is provided to the other end. Furthermore, when the opening 30 is formed, multiple second inclined cut sections 34 are provided on the side of the sealing portion 12 that is opened, by cutting the outer liner 20a, the core 20c, and the inner liner 20b so as to widen toward the opening start end 35. The second inclined cut sections 34, like the inclined cut section 33, may be short in length, for example, about 4 mm. It is also most preferable that the second inclined cut sections 34 be provided at a 45° angle to the second liner cut section 32. In addition, the second inclined cut sections 34 are not limited to a straight line as shown, but may be implemented in other shapes such as an arc, as long as they widen toward the opening start end 35. Furthermore, in this embodiment, the second inclined cut portion 34 is formed by cutting the outer liner 20a, the core 20c, and the inner liner 20b, but it may also be formed by cutting at least one of the outer liner 20a, the core 20c, and the inner liner 20b. Specifically, the second inclined cut portion 34 may be formed by cutting only the outer liner 20a, or by cutting both the outer liner 20a and the core 20c. Moreover, in this embodiment, the second inclined cut portion 34 is positioned slightly apart from the second liner cut portion 32, but it is not limited to this, and may be formed in a manner connected to the second liner cut portion 32.

[0050] Furthermore, as shown in Figures 1 to 3, the inclined cut section 33 and the second inclined cut section 34 are arranged in a staggered pattern with respect to the center line L between the liner cut section 31 and the second liner cut section 32.

[0051] Furthermore, the inclined cut section 33a closest to the opening start end 35 and the second inclined cut section 34a are arranged in a substantially symmetrical manner with respect to the center line L between the liner cut section 31 and the second liner cut section 32, as shown in Figures 1 to 3.

[0052] Furthermore, the inclined cut section 33 and the second inclined cut section 34 may all be arranged in a substantially symmetrical manner with respect to the center line L between the liner cut section 31 and the second liner cut section 32, as shown in Figure 4.

[0053] Furthermore, as shown in the figure, the inclined cut section 33 and the second inclined cut section 34 do not necessarily need to be provided over the entire area from one end to the other where the opening start end 35 is located; they may be provided only around the one end where the opening start end 35 is located.

[0054] As shown in Figures 1 to 3, the inclined cut section 33a closest to the opening start end 35 and the second inclined cut section 34b are spaced slightly apart from the opening start end 35. However, the design is not limited to this, and as shown in Figure 5, they may be connected to the opening start end 35.

[0055] In the packaging box 1 of this embodiment, as shown in Figure 1(a), a hole 4 for checking the contents G is formed in the side wall on the short side. Of course, this confirmation hole 4 may be omitted.

[0056] Furthermore, in this packaging box 1, a notch 6 for forming a handle is provided at the top of the side wall on the short side, and a handle can be formed by pressing with a finger or the like. Of course, the packaging box may also be carried out without providing this notch 6 for forming a handle.

[0057] Furthermore, this packaging box 1 is also provided with a cut line 5 on the top panel for forming an item removal section, allowing the item G to be removed from the top by cutting and opening it with a finger or the like. Of course, this product may be implemented without providing the cut line 5 for forming the item removal section.

[0058] Then, when the packaging box 1 is opened at the opening forming section 3 as described above and the sealing section 12 is removed, the multiple PET bottles, which are the items G, are stored in the tray-shaped item storage section 11, as shown in Figure 6.

[0059] In this embodiment, item G is used as an example of a PET bottle filled with a beverage, but it is not limited to this and can be used with various other items. Furthermore, the tray-shaped item storage portion 11 formed after opening can be used not only as a tray for displaying the items inside in stores, but also as a storage container in homes, workplaces, etc.

[0060] According to the packaging box 1 of the embodiment of the present invention described above, when opened, if it is torn from the opening start end 35, the outer liner 20a and core 20c are not provided with a liner cut portion 31 and a second liner cut portion 32, so the outer liner 20a and core 20c will tear. However, since not only the inner liner 20b but also the outer liner 20a and core 20c are provided with a cut inclined cut portion 33 and a second inclined cut portion 34, even if these tears are deflected, they are received by the inclined cut portion 33 and the second inclined cut portion 34 respectively, and guided back to the liner cut portion 31 and the second liner cut portion 32 respectively, thereby reducing the area that tears. As a result, according to the packaging box 1 of the embodiment of the present invention, the aesthetic appearance of the opening 30 is improved, and a clean opening 30 can be formed.

[0061] Furthermore, if the inclined cut section 33 and the second inclined cut section 34 are performed by cutting only the outer liner 20a, without cutting the core 20c and the back liner 20b, then when opening, if it breaks from the opening start end 35, the outer liner 20a and core 20c will tear because the liner cut section 31 and the second liner cut section 32 are not provided on the outer liner 20a and core 20c. However, although the core 20c and the back liner 20b are not cut, and only the outer liner 20a is cut, the inclined cut section 33 and the second inclined cut section 34 are provided. Since the outer liner 20a, core 20c, and back liner 20b are bonded to each other, even if the tears are deflected, they will be received by the inclined cut section 33 and the second inclined cut section 34, respectively, and guided back to the liner cut section 31 and the second liner cut section 32, respectively, thereby reducing the area that tears. As a result, even in this case, the aesthetic appearance of the opening 30 is improved, and a clean opening 30 can be formed.

[0062] Furthermore, if the inclined cut section 33 and the second inclined cut section 34 are made by cutting the outer liner 20a and the core 20c, without cutting the inner liner 20b, then when opening, if it breaks from the opening start end 35, the outer liner 20a and the core 20c will tear because the outer liner 20a and the core 20c do not have a liner cut section 31 and a second liner cut section 32. However, the inner liner 20b is not cut, and the outer liner 20a and the core 20c are provided with an inclined cut section 33 and a second inclined cut section 34. Since the outer liner 20a, the core 20c, and the inner liner 20b are bonded to each other, even if the tears are deflected, they will be received by the inclined cut section 33 and the second inclined cut section 34, respectively, and guided back to the liner cut section 31 and the second liner cut section 32, respectively, thereby reducing the area that tears. As a result, even in this case, the aesthetic appearance of the opening 30 is improved, and a clean opening 30 can be formed.

[0063] Furthermore, according to the packaging box 1 of this embodiment, the inclined cut section 33 and the second inclined cut section 34 are provided vertically for the sole purpose of guiding, based on the center line L between the liner cut section 31 and the second liner cut section 32, which have cutting lines only on the back liner 20b. As a result, the total amount of cutting in the opening forming section 3 can be reduced. Therefore, according to the packaging box 1 of this embodiment, the total amount of cutting in the opening forming section 3 can be reduced, which increases the support strength of the side wall, reduces the deformation of the side wall when transporting multiple boxes stacked on top of each other, suppresses large deformation of the lower part used for storing articles 11 that can be used after opening, and also prevents deterioration of the quality of the articles G inside.

[0064] Furthermore, with the packaging box 1 according to this embodiment, the opening operation can be performed by inserting a finger into the opening start end 35, making the opening operation easy.

[0065] Furthermore, according to the packaging box 1 of this embodiment, the inclined cut section 33 and the second inclined cut section 34 are arranged in a staggered pattern with respect to the center line L between the liner cut section 31 and the second liner cut section 32. This prevents the inclined cut section 33 from being directly below the second inclined cut section 34, thereby increasing the support strength of the side wall. As a result, the packaging box 1 of this embodiment reduces the deformation of the side wall when transporting multiple boxes stacked on top of each other, suppresses significant deformation of the lower part used for storing articles 11 after opening, and enhances the effect of preventing deterioration of the quality of the articles G inside. Moreover, according to the packaging box 1 of this embodiment, since the inclined cut section 33 and the second inclined cut section 34 are arranged in a staggered pattern with respect to the center line L between the liner cut section 31 and the second liner cut section 32, the area where the inclined cut section 33 and the second inclined cut section 34 overlap when viewed in the vertical direction can be reduced. Therefore, according to the packaging box 1 of this embodiment, the amount of cut in the opening forming portion 3 in the vertical direction can be reduced, which in turn increases the support strength of the side wall portion, reduces the deformation of the side wall portion when transporting multiple boxes stacked on top of each other, suppresses large deformation of the lower article storage portion 11 that can be used after opening, and further enhances the effect of suppressing deterioration of the quality of the articles G inside.

[0066] Furthermore, according to the packaging box 1 of this embodiment, the inclined cut portion 33a closest to the opening start end 35 and the second inclined cut portion 34a are arranged in a substantially symmetrical manner with respect to the center line L between the liner cut portion 31 and the second liner cut portion 32. Therefore, when opening begins, the cutting is guided in a balanced manner from the opening start end 35 by the inclined cut portion 33a closest to the opening start end 35 and the second inclined cut portion 34a, and an opening 30 can be formed neatly with even less force.

[0067] Furthermore, according to this embodiment of the packaging box 1, since there are multiple opening-forming sections 3 at the position where the opening 30 is formed, multiple opening-forming sections 3 can be cut simultaneously with both hands, making the opening operation more efficient.

[0068] Furthermore, in the packaging box 1 according to this embodiment, since the opening start ends 35 are provided adjacent to each other, the opening forming portions 35 can be cut simultaneously by spreading them to the left and right with both hands, making the opening process easier and more efficient. In other words, in the packaging box 1 according to this embodiment, the opening 30 can be formed in two opening operations.

[0069] Furthermore, according to this embodiment of the blank sheet 2, it can be used as a blank sheet for assembling and constructing a packaging box 1 that achieves the effects described above.

[0070] Furthermore, in the embodiment shown in Figure 4, the inclined cut section 33 and the second inclined cut section 34 are arranged in a substantially symmetrical manner with respect to the center line L between the liner cut section 31 and the second liner cut section 32, so that the opening 30 can be formed neatly with even less force overall. However, in this embodiment shown in Figure 4, the support strength of the side wall is slightly less than in the above-described embodiment in which the inclined cut section 33 and the second inclined cut section 34 are arranged in a staggered manner with respect to the center line L between the liner cut section 31 and the second liner cut section 32, so it is particularly suitable when using corrugated cardboard with higher strength or when storing relatively light items inside.

[0071] Furthermore, in the embodiment shown in Figure 5, the opening start end 35, the inclined cut portion 33a, and the second inclined cut portion 34a are connected, so less force is required when starting to open, and an opening can be formed neatly with even less force.

[0072] Although embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0073] 1 packaging box 11 Part for storing items 12 Sealing part 2 Blank Sheets 20 cardboard 20a Front liner 20b Reverse liner 20c core 30 aperture 3 Aperture forming part 31 Liner cut section 32 Second liner cut section 33 Inclined cut section 33a Inclined cut section (closest to the opening start end) 34 Second bevel cut section 34a Second inclined cut section (closest to the opening start end) 35 Opening point L center line G Goods

Claims

1. A packaging box made of corrugated cardboard having an opening-forming section that can form an opening, comprising an outer liner that forms the outer surface, a reinforcing core, and an inner liner that forms the inner surface, The aforementioned opening forming portion is A liner cut portion is provided on the back liner along the position where the opening is formed, with linear, continuous or discontinuous cutting lines. An opening start end provided at at least one end of the liner cut portion, The liner cut portion is provided with an inclined cut portion located around at least one end of the liner cut portion, on the side of the article storage portion where the opening is formed, by cutting one or both of the outer liner, the core, and the inner liner so as to widen toward the opening start end. A second liner cut portion is provided at a position opposite to the position where the opening is formed, and the back liner is arranged at intervals on the side of the liner cut portion, with linear, continuous or discontinuous cutting lines provided on the back liner. At least around the end of the second liner cut portion, a second inclined cut portion is provided on the sealing portion side where the opening is formed, by cutting any or both of the outer liner, the core, and the inner liner so as to widen toward the opening start end. The inclined cut portion and the second inclined cut portion are arranged in a substantially symmetrical manner with respect to the center line between the liner cut portion and the second liner cut portion, with respect to only the one closest to the opening start end. A packaging box characterized by the following.

2. A packaging box made of corrugated cardboard having an opening-forming section that can form an opening, comprising an outer liner that forms the outer surface, a reinforcing core, and an inner liner that forms the inner surface, The aforementioned opening forming portion is A liner cut portion is provided on the back liner along the position where the opening is formed, with linear, continuous or discontinuous cutting lines. An opening start end provided at at least one end of the liner cut portion, The liner cut portion is provided with an inclined cut portion located around at least one end of the liner cut portion, on the side of the article storage portion where the opening is formed, by cutting one or both of the outer liner, the core, and the inner liner so as to widen toward the opening start end. A second liner cut portion is provided at a position opposite to the position where the opening is formed, and the back liner is arranged at intervals on the side of the liner cut portion, with linear, continuous or discontinuous cutting lines provided on the back liner. At least around the end of the second liner cut portion, a second inclined cut portion is provided on the sealing portion side where the opening is formed, by cutting any or both of the outer liner, the core, and the inner liner so as to widen toward the opening start end. The opening start end, the inclined cut portion, and the second inclined cut portion are connected. A packaging box characterized by the following.

3. The inclined cut portion and the second inclined cut portion are arranged in a staggered pattern with respect to the center line between the liner cut portion and the second liner cut portion. A packaging box according to claim 1 or 2, characterized by the above.

4. The inclined cut portion and the second inclined cut portion are arranged in a substantially symmetrical manner with respect to the center line between the liner cut portion and the second liner cut portion. The packaging box according to claim 2, characterized by the following:

5. The position in which the opening is formed has multiple opening-forming portions. A packaging box according to claim 1 or 2, characterized by the above.

6. A blank sheet made of corrugated cardboard that is used to assemble and construct the packaging box described in claim 1 or 2. A blank sheet characterized by the following.

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