Packaging box

Abstract

To provide a packaging box whose hand hole part is unlikely to return to an original shape and which can be stably gripped.SOLUTION: A packaging box has a cylindrical trunk part 10, a top plate 20, and a bottom plate 30. The top plate 20 is provided with inner flaps 21 and 21 connected to side walls 13 and 14, and front and rear outer flaps 22 and 22 connected to both end walls 11 and 12 and overlapped on outer surfaces of the inner flaps 21. The outer flap 22 is formed with a hand hole part 50 for gripping with a hand. The hand hole part 50 includes a first surface part 51 that is mountain-folded with respect to the outer flap 22, and a second surface part 52 that is continuous with a tip end of the first surface part 51 and is valley-folded with respect to the first surface part 51. The outer flap 22, the first surface part 51, and the second surface part 52 form a Z-shaped cross-section. The second surface part 52 presses down the inner flap 21, and a protrusion part 53 is formed at a base end of the second surface part 52 by cutting and raising a tip end of the first surface part 51.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a packaging box that is used as a bag-in-box and serves as an outer box for accommodating an inner bag containing a liquid. [Background technology]

[0002] The packaging box used as the outer box of the bag-in-box has a hand hole formed on the top surface, and the liquid in the inner bag is poured by placing a hand through the hand hole and lifting and tilting the packaging box. Various configurations of the hand hole are known (for example, see Fig. 2 of Patent Document 1).

[0003] The hand hole of the packaging box of Patent Document 1 has an inner center fold formed in the inner flap and an outer center fold formed in the outer flap. The outer center fold has a first divided piece on the base end side and a second divided piece on the tip end side. The first divided piece is mountain-folded and folded inward against the outer flap, and the second divided piece is mountain-folded from the tip of the first divided piece and folded back, with its surface abutting against the surface of the inner center fold. When the worker pushes the first divided piece inward, the second divided piece pushes and bends the inner center fold inward, and the worker grasps the hand hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6865156 Summary of the Invention [Problem to be solved by the invention]

[0005] In the hand hole of the packaging box of Patent Document 1, both the outer and inner center folds are simply folded in half, so there was a problem that they tended to return to their original positions and were difficult to grip.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to solve the above-mentioned problems and to provide a packaging box in which the hand hole is unlikely to return to its original shape and which can be gripped in a stable state. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a packaging box having a cylindrical body having front and rear end walls and left and right side walls, a top plate provided at an upper opening of the body, and a bottom plate provided at a lower opening of the body. The top plate includes an inner flap connected to the side walls, and front and rear outer flaps connected to both end walls and overlapping the outer surface of the inner flap, and the outer flap has a hand hole for gripping with a hand. The hand hole includes a first surface portion that is mountain-folded relative to the outer flap, and a second surface portion that is continuous with the tip of the first surface portion and valley-folded relative to the first surface portion, and the outer flap, the first surface portion, and the second surface portion form a Z-shaped cross section, and the second surface portion presses down the inner flap, and a protruding portion is formed at the base end of the second surface portion by cutting and raising the tip of the first surface portion.

[0008] According to the packaging box of the present invention, the outer flap, the first surface portion, and the second surface portion have a Z-shaped cross section, which can resist the force of the inner flap returning to its original shape, making it difficult for the hand hole portion to return to its original shape. This allows the hand hole portion to be gripped in a stable state. Furthermore, by abutting the protruding portion against the inner surface of the body portion, the angle of the first surface portion is fixed, so that the shape of the hand hole portion can be gripped in a stable state and the hand hole portion is less likely to tear. Furthermore, by fixing the angle of the first surface portion, the inner flap pressed down by the second surface portion can resist the force of the inner flap returning to its original shape.

[0009] In the packaging box of the present invention, it is preferable that the bottom plate is formed with a hand hole. With such a configuration, the packaging box can be tilted by holding the top and bottom of the packaging box, making it easier to pour liquid. Effect of the Invention

[0010] According to the packaging box of the present invention, the hand hole portion is unlikely to return to its original shape, and the box can be gripped in a stable state. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view of a packaging box according to an embodiment of the present invention, viewed from the upper right front side. FIG. [Diagram 2] FIG. 2 is a diagram showing a blank sheet for a packaging box according to an embodiment of the present invention. [Diagram 3] 1A is a perspective view showing a main part of a top plate of a packaging box according to an embodiment of the present invention, in which (a) is a perspective view showing the state before each flap is closed, and (b) is a perspective view showing the state after each flap is closed. [Figure 4] 1 is a perspective view showing a state in which a hand hole portion is formed in a packaging box according to an embodiment of the present invention; [Diagram 5] 5 is a cross-sectional view taken along line VV in FIG. 4. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] An embodiment of the present invention will be described in detail with reference to the drawings as appropriate. In the following description, the front, rear, left and right directions are set for the convenience of describing the packaging box of the present embodiment, and do not limit the configuration or usage state of the packaging box.

[0013] As shown in Fig. 1, the packaging box 1 of this embodiment is used as a bag-in-box, and serves as an outer box for housing an inner bag 40 containing a liquid such as edible oil. The inner bag 40 is made of resin, and has a spout 41 formed at its upper end. A lid 43 is removably attached to the spout 41. The packaging box 1 comprises a cylindrical body 10, a top plate 20 provided at the upper opening of the body 10, and a bottom plate 30 provided at the lower opening of the body 10.

[0014] 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. 2. The blank sheet S shown in Fig. 2 is arranged so that the outer surface is visible.

[0015] 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 the creases may be formed with intermittent cuts. In this way, it becomes easier to fold the blank sheet S at the fold lines. Alternatively, the folded line may be formed by forming a half-cut slit only on the surface of the sheet or a slit penetrating the sheet in an intermittent linear fashion.

[0016] As shown in Fig. 1, the body 10 has a pair of front and rear end walls (front end wall 11 and rear end wall 12) and a pair of left and right side walls (left side wall 13 and right side wall 14). The front end wall 11, the rear end wall 12, the left side wall 13 and the right side wall 14 are formed in a quadrangle (see Fig. 2).

[0017] A left side wall 13 is connected to the left edge of the front end wall 11 via a fold line, and a rear end wall 12 is connected to the rear edge of the left side wall 13 via a fold line. A band-shaped joint piece 15 is connected to the right edge of the rear end wall 12 via a fold line. In addition, a right side wall 14 is connected to the right edge of the front end wall 11 via a fold line. The joint piece 15 is joined to the inner surface of the right side wall 14.

[0018] When the blank sheet S (see Figure 2) is folded along each fold line and the joining piece 15 is joined to the inner surface of the right side wall 14, the front end wall 11, rear end wall 12, left side wall 13 and right side wall 14 form a cylindrical body 10 that is rectangular in plan view.

[0019] The top plate 20 closes the upper opening of the body 10. The top plate 20 includes a pair of front and rear inner flaps 21, 21 connected to the upper edges of the left side wall 13 and the right side wall 14, respectively, and a pair of front and rear outer flaps 22, 22 connected to the upper edges of the front end wall 11 and the rear end wall 12, respectively.

[0020] As shown in Figs. 3 and 4, a notch 23 is formed in the front portion of the leading edge of each of the inner flaps 21. The notch 23 is formed in a rectangular shape. The notch 23 of each of the inner flaps 21 join together to form an opening 24 through which the spout 41 of the inner bag 40 passes. The rear portions 25 of the leading edges of each of the inner flaps 21 are butted together at the center in the left-right direction of the upper opening of the body 10. The outer flaps 22 are overlapped on the outer surfaces (upper surfaces) of the inner flaps 21. The leading edges of each of the outer flaps 22 are butted together at the center in the front-rear direction of the upper opening of the body 10.

[0021] The front outer flap 22 (hereinafter, sometimes referred to as "front outer flap 22a" when distinguishing between the front and rear) connected to the upper edge of the front end wall 11 is provided with a spout break line 44. The spout break line 44 is a break line for forming an opening for the spout that allows the spout 41 of the inner bag 4 to protrude upward. The spout break line 44 is formed in a circular shape, and by removing the inside of the break line, an opening through which the spout 41 passes is formed.

[0022] A hand hole 50 is formed in the rear outer flap 22 (hereinafter, sometimes referred to as the "rear outer flap 22b" when distinguishing between the front and rear) connected to the upper edge of the rear end wall 12. As shown in Figs. 4 and 5, the hand hole 50 is a hole for an operator to hold with his / her hand, and is formed at an upper position of the rear part 25 of the inner flap 21. The hand hole 50 is formed by folding a part surrounded by a mountain fold line 55 formed in the rear outer flap 22b and a break line 54 formed continuously to both ends of the mountain fold line 55. The mountain fold line 55 has a straight shape extending in the left-right direction, and the break line 54 has a C-shape. The part surrounded by the mountain fold line 55 and the break line 54 has a rectangular shape with four corners chamfered in an arc shape. A valley fold line 56 is formed in the part surrounded by the mountain fold line 55 and the break line 54. Valley fold line 56 has a straight portion parallel to mountain fold line 55. A cut line 57 for cutting and raising overhanging portion 53 described below is formed in the middle of the valley fold line. Cut line 57 is formed in a convex shape that overhangs toward mountain fold line 55. Hand hole portion 50 has first surface portion 51, second surface portion 52, and overhanging portion 53 within an opening formed by cutting break line 54.

[0023] The first surface portion 51 is a portion that is mountain-folded relative to the rear outer flap 22b, and in the mountain-folded state, extends downward from the surface of the rear outer flap 22b. The first surface portion 51 is formed by folding a portion that protrudes forward from the vicinity of the base end (rear end) of the rear outer flap 22b downward at a mountain fold line 55. The second surface portion 52 is continuous with the tip of the first surface portion 51, and is a portion that is valley-folded relative to the first surface portion 51.

[0024] The second surface portion 52 is formed by folding a portion protruding from the tip end (lower end) of the first surface portion 51 forward at a valley fold line 56. The second surface portion 52 abuts against the rear portion 25 of the tip edge of the inner flap 21, and presses the inner flap 21 down toward the inside of the packaging box 1. The base end of the rear outer flap 22b, the first surface portion 51, and the second surface portion 52 form a Z-shaped (crank-shaped) cross section (see FIG. 5). It is preferable that the first surface portion 51 is folded relative to the rear outer flap 22b at an angle such that the tip end (rear end) of the protruding portion 53 described later abuts against the inner surface of the rear end wall 12 of the body portion 10, and it is preferable that the second surface portion 52 is folded relative to the first surface portion 51 at an angle such that the second surface portion 52 and the protruding portion 53 are parallel to the first surface portion 51. In this embodiment, the angle between the first surface portion 51 and the rear outer flap 22b is an acute angle, and the first surface portion 51 is bent downwardly so as to approach the rear end wall 12. The angle between the second surface portion 52 and the first surface portion 51 is equal to the angle between the first surface portion 51 and the rear outer flap 22b.

[0025] The protruding portion 53 is continuous with the base end (rear end) of the second surface portion 52 and protrudes rearward. The protruding portion 53 is formed by cutting and raising the left-right middle portion of the tip of the first surface portion 51. The protruding portion 53 is formed flush with the second surface portion 52 and contacts the rear portion 25 of the tip edge of the inner flap 21 together with the second surface portion 52, pushing the inner flap 21 down toward the inside of the packaging box 1. The tip end (rear end) of the protruding portion 53 contacts the inner surface of the rear end wall 12 of the body portion 10.

[0026] When forming the hand hole 50 configured as described above, when the portion constituting the overhang 53 of the horizontal rear outer flap 22b is pushed downward, the break line 54 is cut, and the side edge of the first surface 51 and the second surface 52 are separated from the surface of the rear outer flap 22b and folded into an L shape. At the same time, the cut line 57 is cut, and the overhang 53 is pushed downward while remaining flush with the second surface 52. By simply pushing the portion constituting the overhang 53 downward in this manner, the hand hole 50 is easily formed.

[0027] In the hand hole 50, the second surface 52 and the protruding portion 53 push the inner flap 21 toward the inside of the packaging box 1, and the inner flap 21 receives a restoring force that returns it to its original position. At this time, the first surface 51 can brace itself against the restoring force of the inner flap 21, so the hand hole 50 is stable and can maintain its shape. In particular, the tip (rear end) of the protruding portion 53 abuts against the inner surface of the rear end wall 12 of the body 10, so the inclination angle of the first surface 51 is fixed. As a result, the second surface 52 and the protruding portion 53 do not rise above that position. Therefore, the hand hole 50 is able to resist the restoring force of the inner flap 21, so that the hand hole 50 is in a more stable state.

[0028] The bottom plate 30 closes the opening on the lower side of the body 10. The bottom plate 30 includes a pair of front and rear inner flaps 31, 31 connected to the lower edges of the left side wall 13 and the right side wall 14, respectively, and a pair of left and right outer flaps 32, 32 connected to the lower edges of the front end wall 11 and the rear end wall 12, respectively. A handhold hole 33 is formed in the bottom plate 30.

[0029] The inner flaps 31, 31 are folded in the front-rear direction from the lower edges of the left side wall 13 and the right side wall 14 so as to face each other. The leading edges of the inner flaps 31, 31 are butted against each other. The outer flaps 32, 32 are folded in the left-right direction from the lower edges of the front end wall 11 and the rear end wall 12 so as to face each other. The outer flaps 32, 32 are placed on the outer surfaces (lower surfaces) of the inner flaps 31, 31, and the leading edges of the outer flaps 32, 32 are butted against each other. A hot melt adhesive (not shown) is applied to the outer surface of the inner flap 31 to bond the inner flap 31 and the outer flap 32 together.

[0030] The hand hole 33 is a hole for a worker to put his / her hand on the bottom plate 30 of the packaging box 1 and grip it when putting his / her hand on the hand hole portion 50 to tilt the packaging box 1. The hand hole 33 is disposed at a position below the hand hole portion 50. The hand hole 33 is formed by cutting out the rear outer flap 32, and has an elongated hole shape extending in the left-right direction. The four corners of the hand hole 33 are chamfered in an arc shape.

[0031] According to the packaging box 1 of the present embodiment, the first surface portion 51 is mountain-folded relative to the outer flap 22, and the second surface portion 52 is valley-folded relative to the first surface portion 51, so that the first surface portion 51 can brace against the force that causes the inner flap 21 to return to its original shape. This makes it difficult for the hand hole portion 50 to return to its original shape, so that the worker can hold the hand hole portion 50 in a stable state.

[0032] In particular, a protruding portion 53 is formed at the base end of the second surface portion 52, and the tip end (rear end) of the protruding portion 53 abuts against the inner surface of the rear end wall 12 of the body portion 10, so that the inclination angle of the first surface portion 51 is fixed and can resist the restoring force of the inner flap 21, making the hand hole portion 50 in a more stable state. Furthermore, the surface area that presses the inner flap 21 is increased by the area of ​​the protruding portion 53, further increasing stability. Also, since a hole is formed in the first surface portion 51 by cutting and raising the protruding portion 53, a finger can be hooked on the hole of the first surface portion 51 when holding the hand hole portion 50, making it even easier to hold. Furthermore, when forming the hand hole portion 50, a mountain fold and a valley fold can be performed simultaneously by pressing the protruding portion 53 downward, so that the hand hole portion 50 can be formed easily.

[0033] In addition, since a hand hole 33 is formed in the bottom plate 30, a worker can hold the top and bottom of the packaging box 1 (hand hole portion 50 and hand hole 33) and tilt the packaging box 1, making it easier to pour liquid.

[0034] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified within the scope of the present invention. For example, in the packaging box 1 of this embodiment, the hand hole 33 is formed by cutting only the outer flap 22 of the bottom plate 30, but this is not limited to this. For example, a C-shaped cut may be made in the part of the inner flap that overlaps with the hand hole to form a hand hole that bends inward. With this configuration, it becomes easier to put your hand through the hand hole, and you can hold the packaging box in a more stable state. [Explanation of symbols]

[0035] 1 packaging box 10. Torso 11 Front end wall 12 Back end wall 13 Left side wall 14 Right side wall 20 Top plate 21 Inner flap 22 Outer flap 30 Bottom plate 31 Inner flap 32 Outer flap 33 Hand hole 50 Hand hole part 51 First page 52 Second surface part 53 Overhang

Claims

1. A cylindrical body portion having front and rear end walls and left and right side walls; A top plate provided at an upper opening of the body portion; A bottom plate provided at an opening on the lower side of the body portion, The top plate is An inner flap connected to the side wall; and front and rear outer flaps connected to the end walls and overlapping the outer surfaces of the inner flaps, The outer flap is formed with a hand hole for gripping the bag with a hand. The hand hole portion includes a first surface portion that is mountain-folded relative to the outer flap, and a second surface portion that is continuous with a tip of the first surface portion and valley-folded relative to the first surface portion, The outer flap, the first surface portion, and the second surface portion form a Z-shaped cross section, and the second surface portion presses down the inner flap, A packaging box, characterized in that a protrusion is formed at a base end of the second surface by cutting and raising a tip end of the first surface.

2. The packaging box according to claim 1, The packaging box is characterized in that a hand hole is formed in the bottom plate.

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