Packing box

Abstract

To provide a packaging box capable of improving appearance when an opening strap is cut from a wall body, while suppressing deterioration in the compressive strength of the wall body.SOLUTION: In a packaging box 1, an opening strap 50 is formed between an upper cutting guide line L10 and a lower cutting guide line L20 extending in a lateral direction on a side wall 12 (wall body). The upper cutting guide line L10 is linearly formed. In the lower cutting guide line L20, a wavy area L26 in which a plurality of second lower slits L22 are arranged in a wave form curved in a vertical direction is formed. Between the upper cutting guide line L10 and the wavy area L26, an opening starting slit L30 extending in the vertical direction is formed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a packaging box. [Background technology]

[0002] Some cardboard packaging boxes have two upper and lower cutting guide lines extending horizontally along the wall, with an opening strip formed between the two cutting guide lines (see, for example, Patent Document 1). In such a packaging box, the lower half of the packaging box can be used as a tray after the tear strip is pulled outward, cut from the wall, and the packaging box is separated into upper and lower halves for opening. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-172275 Summary of the Invention [Problem to be solved by the invention]

[0004] When the tear guide line is formed in a straight line as in the conventional packaging box described above, when the tear strip is cut from the wall, the tear guide line may not be cut cleanly and part of the tear strip may remain on the wall. In this case, when the lower half of the packaging box is used as a tray, the appearance of the upper edge of the wall may not be good.

[0005] To provide a packaging box which solves the above-mentioned problems and can improve the appearance when the tear strip is cut off from the wall body while suppressing a decrease in the compressive strength of the wall body. [Means for solving the problem]

[0006] To solve the above problems, the present invention provides a packaging box comprising a cylindrical body formed by a plurality of walls, and a top plate and a bottom plate respectively connected to the upper and lower edges of the body. The walls are formed with upper and lower tear guide lines extending laterally, with a tear strip formed between the upper and lower tear guide lines. The upper tear guide line has a plurality of upper slits arranged in a straight line. The lower tear guide line has a wavy region in which a plurality of lower slits are arranged in a vertically curved, wavy pattern. The upper slit has a straight portion extending parallel to the upper edge of the body portion and a vertical slit protruding from the straight portion toward the opening strip, and the upper slit is formed in a T-shape when viewed from the side. An opening start slit extending in the vertical direction is formed between the upper tear guide line and the wavy region.

[0007] In the packaging box of the present invention, when the opening start slit is cut open and the tear strip begins to be cut from the wall, the wavy region of the lower cutting guide line can be cut open neatly with little force, which prevents part of the tear strip from remaining on the lower side of the wall, improving the appearance of the lower half of the packaging box when used as a tray after opening.

[0008] In the packaging box of the present invention, the upper cutting guide line is formed in a straight line, which can prevent a decrease in the vertical compressive strength of the wall body compared to when the upper cutting guide line is curved, and therefore can prevent a decrease in the load-bearing capacity of the packaging box.

[0009] The above-mentioned packaging box So A vertical slit protruding from the upper slit to the tear strip side is formed. Because This makes it easier to cut open the upper cutting guide wire.

[0010] If the end of the lower slit of the packaging box on the opening start slit side is inclined toward the opposite side of the opening strip side, it is possible to prevent the lower slit from cutting to the opposite side of the opening strip side when cutting open the lower cutting guide line. [Effects of the Invention]

[0011] The packaging box of the present invention has an upper cutting guide line formed in a straight line and a lower cutting guide line provided with a wavy region, which prevents a decrease in the compressive strength of the wall body, and allows the lower cutting guide line to be cut open cleanly, improving the appearance after opening. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper front left. FIG. [Figure 2] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper right rear side. FIG. [Figure 3] 1 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention; [Figure 4] 1 is a perspective view showing a state in which a packaging box according to an embodiment of the present invention has been opened; DETAILED DESCRIPTION OF THE INVENTION

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the front, back, left and right directions are set for the convenience of describing the packaging box of this embodiment, and do not limit the configuration or usage state of the packaging box of the present invention.

[0014] 1, the packaging box 1 of this embodiment includes a cylindrical body 10, a top plate 20 connected to the upper edge of the body 10, and a bottom plate 30 connected to the lower edge of the body 10. The packaging box 1 of this embodiment is a wrap-around cardboard box. The body 10 of this embodiment is formed into a rectangular cylindrical shape by four walls: a pair of front and rear end walls 11, 11 and a pair of left and right side walls 12, 12.

[0015] The packaging box 1 of this embodiment is formed by mountain-folding or valley-folding a blank sheet S cut out from a cardboard sheet at each fold line, as shown in Fig. 3. The blank sheet S shown in Fig. 3 is arranged so that the inner side is visible. The fold lines of the blank sheet S are creases (pressed creases) formed by linearly pressing the surface of the blank sheet S. Note that intermittent slits may be formed in the creases, which makes it easier to fold the blank sheet S at the creases. Alternatively, the folded lines may be formed by forming half-cut slits that cut only the surface of the sheet or by forming intermittent linear slits that penetrate the sheet.

[0016] As shown in Fig. 1, the bottom plate 30 is a rectangular flat plate. The left side wall 12 is connected to the left edge of the bottom plate 30 via a fold line, and the right side wall 12 is connected to the right edge of the bottom plate 30 via a fold line. The left and right side walls 12, 12 are the same rectangular wall body and are formed perpendicular to the bottom plate 30 (see Fig. 2).

[0017] A top plate 20 is connected to the upper edge of the left side wall 12 via a folding line. The top plate 20 is a rectangular flat plate like the bottom plate 30, and is formed perpendicular to the left side wall 12. By folding the blank sheet S (see Figure 3) at each fold line and joining the joining piece 13 connected to the upper edge of the right side wall 12 to the inner surface of the top plate 20, the right side wall 12, bottom plate 30, left side wall 12 and top plate 20 are formed into a rectangular cylindrical shape.

[0018] The front end wall 11 is provided with a pair of upper and lower outer flaps 14, 14 connected to the front edges of the top plate 20 and the bottom plate 30, respectively, and a pair of left and right inner flaps 15, 15 connected to the front edges of the left and right side walls 12, 12, respectively. The outer flaps 14, 14 are overlapped and joined to the outer surfaces of the inner flaps 15, 15. In the packaging box 1 of this embodiment, the inner flaps 15, 15 are arranged with a gap between them in the left-right direction, and the outer flaps 14, 14 are arranged with a gap between them in the up-down direction. As a result, in the packaging box 1 of this embodiment, the center of the end wall 11 is open, and the middle parts of the inner flaps 15, 15 in the up-down direction are exposed to the outside from between the outer flaps 14, 14.

[0019] As shown in FIG. 2, the rear end wall 11 of the packaging box 1 is configured symmetrically to the front end wall 11, and is composed of upper and lower outer flaps 14, 14 and left and right inner flaps 15, 15.

[0020] As shown in Fig. 1, an upper tear guide line L10, a lower tear guide line L20, and an opening start slit L30 are formed on the left side wall 12 of the packaging box 1 of this embodiment. The upper tear guide line L10, the lower tear guide line L20, and the opening start slit L30 are perforated lines formed by intermittent cuts, and are cut open when the packaging box 1 is opened (see Fig. 4).

[0021] The upper cutting guide line L10 extends in the front-rear direction over the front and rear edges of the side wall 12. The upper cutting guide line L10 has a plurality of upper slits L11 linearly arranged at intervals in the front-rear direction. The upper slit L11 extends parallel to the upper edge of the side wall 12. The upper slit L11 is located slightly below the position of the lower edge of the outer flap 14 on the upper side of the end wall 11.

[0022] Of the upper slits L11, the upper slits L11 other than the upper slit L11 located in the center are formed with vertical slits L12 that protrude vertically downward, and are formed in a T-shape in side view.

[0023] The lower cutting guide line L20 extends in the front-rear direction over the front and rear edges of the side wall 12. The lower cutting guide line L20 is formed with a linear region L25 in which a plurality of first lower slits L21 are arranged in a straight line, and a wavy region L26 in which a plurality of second lower slits L22 are arranged in a wavy pattern curved in the up-down direction.

[0024] Linear regions L25, L25 are formed at the front and rear ends of the lower cutting guide line L20, respectively. In the linear region L25, a plurality of first lower slits L21 are arranged linearly at intervals in the front-rear direction. The first lower slit L21 extends parallel to the lower edge of the side wall 12. The first lower slit L21 is also positioned slightly above the position of the upper edge of the outer flap 14 on the lower side of the end wall 11.

[0025] A wavy region L26 is formed between the front and rear linear regions L25, L25. That is, the wavy region L26 is formed in the center of the side wall 12 in the front-rear direction. In the wavy region L26, a plurality of second lower slits L22 are arranged in a wavy shape curved in the vertical direction. The second lower slit L22 is curved in an arc shape, and a plurality of second lower slits L22 are arranged in the front-rear direction, thereby forming a wavy line with a plurality of repeated concave and convex portions. In the second lower slit L22, an end L23 on the opening start slit L30 side (the center side in the front-rear direction of the side wall 12) is inclined downward.

[0026] An opening start slit L30 is formed in the center of the side wall 12 in the front-to-rear direction. The opening start slit L30 extends linearly in the vertical direction between the upper tearing guide line L10 and the wavy region L26 of the lower tearing guide line L20. In this embodiment, the opening start slit L30 extends perpendicular to the upper and lower edges of the side wall 12.

[0027] The upper end of the opening start slit L30 is connected to the upper slit L11 in the center of the upper cutting guide wire L10. The lower end of the opening start slit L30 is connected to the center of the wavy region L26 of the lower cutting guide line L20. In this embodiment, the lower end of the opening start slit L30 is connected to the apex of the curved portion of the wavy region L26 that protrudes upward.

[0028] Two upper and lower end wall cutting guide lines L40, L40 are formed on the left front inner flap 15 (see FIG. 3). The end wall cutting guide line L40 is formed linearly over the left and right edges of the inner flap 15. The end wall cutting guide line L40 is formed parallel to the upper and lower edges of the end wall 11. The upper end wall cutting guide line L40 is continuous with the front end of the upper cutting guide line L10, and the lower end wall cutting guide line L40 is continuous with the front end of the lower cutting guide line L20. The upper and lower end wall cutting guide lines L40, L40 are arranged between the upper and lower outer flaps 14, 14. As shown in FIG. 2, the rear left inner flap 15 is also formed with two upper and lower end wall cutting guide lines L40, L40, similar to the front left inner flap 15 (see FIG. 3).

[0029] 1, a tear strip 50 extending in the front-to-rear direction is formed between the upper tear guide line L10 and the lower tear guide line L20. The tear strip 50 is divided into front and rear by an opening start slit L30. The opening strip 50 is also formed between the upper and lower end wall cutting guide lines L40, L40 of the left front inner flap 15, and as shown in Figure 2, it is also formed between the upper and lower end wall cutting guide lines L40, L40 of the left rear inner flap 15.

[0030] The right side wall 12 is also formed with an upper cutting guide line L10 and a lower cutting guide line L20, similar to the left side wall 12. As shown in FIG. 1, the right front inner flap 15 also has two upper and lower end wall cutting guide lines L40, L40 formed thereon, similar to the left front inner flap 15, and as shown in FIG. 2, the right rear inner flap 15 also has two upper and lower end wall cutting guide lines L40, L40 formed thereon, similar to the left rear inner flap 15. As shown in FIG. 1, the right side wall 12, the right front inner flap 15 and the right rear inner flap 15 also have tear strips 50 formed thereon.

[0031] When opening the packaging box 1 of this embodiment, first, the opening start slit L30 shown in FIG. 1 is pressed inward with a finger to cut open the opening start slit L30. Then, the opening strip 50 is grasped from the opening start slit L30 and the front and rear of the opening strip 50 are pulled outward, whereby the upper cutting guide line L10 and the lower cutting guide line L20 are cut open toward the side edge of the side wall 12, and the opening strip 50 is cut from the side wall 12. Furthermore, the tear strip 50 passes through the corner between the side wall 12 and the inner flap 15 (end wall 11 ) and enters the inner flap 15 , and the tear strip 50 is cut off from the inner flap 15 . In this way, by cutting the tear strip 50 from the left and right side walls 12, 12 and the front and rear end walls 11, 11 and separating the packaging box 1 into upper and lower halves as shown in Figure 4, the lower half of the packaging box 1 can be used as a tray.

[0032] In the packaging box 1 described above, as shown in FIG. 1, when the opening start slit L30 is cut open and the tear strip 50 begins to be cut from the side wall 12, the wavy region L26 of the lower cutting guide line L20 can be cut open cleanly with little force. This prevents part of the tear strip 50 from remaining torn off at the lower part of the side wall 12, as shown in Figure 4, and therefore improves the appearance when the lower half of the packaging box 1 is used as a tray after opening the packaging box 1. In addition, in the packaging box 1 of this embodiment, the end L23 of the second lower slit L22 on the opening start slit L30 side is inclined toward the opposite side of the opening strip 50, so that when cutting open the lower cutting guide line L20, it is possible to prevent the second lower slit L22 from cutting to the opposite side of the opening strip 50.

[0033] In addition, in the packaging box 1 of this embodiment, a vertical slit L12 is formed that protrudes from the upper slit L11 of the upper tearing guide line L10 toward the opening strip 50, so that the upper tearing guide line L10 can be cut open with little force.

[0034] Furthermore, in the packaging box 1 of this embodiment, the upper slits L11 of the upper cutting guide line L10 are arranged in a straight line. With this configuration, the decrease in the compressive strength of the side wall 12 in the vertical direction can be suppressed compared to when the upper cutting guide line L10 is curved, and therefore the decrease in the load-bearing capacity of the packaging box 1 can be suppressed.

[0035] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and can be modified as appropriate within the scope of the invention. In the packaging box 1 of this embodiment, as shown in FIG. 1, the vertical slit L12 extends from the upper slit L11 of the upper cutting guide line L10. As a reference example of the present invention, The vertical slit L12 does not have to be formed in the upper cutting guide wire L10.

[0036] In the packaging box 1 of this embodiment, the wavy region L26 is formed in the middle of the lower cutting guide line L20, but the wavy region L26 may be formed over the entire lower cutting guide line L20.

[0037] In the packaging box 1 of this embodiment, the body 10 is formed in a rectangular cylindrical shape having front and rear end walls 11, 11 and left and right side walls 12, 12, but the shape of the body 10 is not limited, and an inclined wall may be provided between the end wall 11 and the side wall 12.

[0038] The packaging box 1 of this embodiment is a wrap-around type cardboard box, but the configuration of the packaging box of the present invention is not limited thereto, and it may be, for example, an A-type cardboard box.

[0039] The packaging box 1 of this embodiment is made of corrugated cardboard, but the packaging box may also be made of various known paperboards. [Explanation of symbols]

[0040] 1 packaging box 10. Torso 11 End Wall 12 Side wall 13 Joint piece 14 Outer flap 15 Inner flap 20 Top plate 30 Bottom plate 50 Opening band L10 Upper cutting guide wire L11 Upper slit L12 vertical slit L20 Lower cutting guide wire L21 First lower slit L22 Second lower slit L25 Linear area L26 Wavy area L30 Opening start slit L40 End wall cutting guide wire S Blank Sheet

Claims

1. a body portion formed into a cylindrical shape by a plurality of walls; a top plate and a bottom plate respectively connected to the upper and lower edges of the body portion; The wall is formed with upper and lower cutting guide lines extending laterally, A tear-opening band is formed between the upper cutting guide line and the lower cutting guide line, The upper cutting guide line has a plurality of upper slits arranged in a straight line, The lower cutting guide line has a wavy region in which a plurality of lower slits are arranged in a wavy shape curved in the vertical direction, The upper slit has a straight portion extending parallel to the upper edge of the body portion and a vertical slit protruding from the straight portion toward the opening strip side, and the upper slit is formed in a T-shape in a side view, The packaging box is characterized in that an opening start slit extending in the vertical direction is formed between the upper tear guide line and the wavy region.

2. The packaging box according to claim 1, A packaging box characterized in that the end of the lower slit on the opening start slit side is inclined toward the opposite side to the opening strip side.

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