Packing box

Abstract

The present invention provides a packaging box that can be quickly assembled, in which the top surface is formed by an inner flap on the top side and an outer flap on the top side. [Solution] The present invention provides a packaging box 10 comprising inner flaps 22a, 22b, 32a, 32b and outer flaps 21a, 21b, 31a, 31b that form a top surface 20 and a bottom surface 30, wherein one of the inner flaps 22a, 22b, 32a, 32b is provided with a crushed portion 42 that overlaps in part or in whole in two right-angled triangular regions 41 with the two corners of the inner flap as vertices, and a weakening line 45 is formed on the hypotenuse 43 of the right-angled triangle from the leading edge of the inner flap to a predetermined position 44, and a cut line 46 is formed in the right-angled triangle from the predetermined position 44 to the side edge of the inner flap.

Description

[[TECHNICAL FIELD]]

[0001] The present invention relates to a packaging box. In particular, it relates to a packaging box made of corrugated cardboard sheet. [[BACKGROUND ART]]

[0002] Conventionally, in the distribution process of articles, corrugated cardboard packaging boxes (hereinafter referred to as corrugated cardboard boxes) for packaging and accommodating articles are widely used to prevent the articles from being soiled or damaged. As one type of corrugated cardboard box structure, a top surface part and a bottom surface part are formed by bending a pair of inner flaps inward, and then bending a pair of outer flaps so that their end edges abut against each other to overlap the inner flaps.

[0003] Here, since corrugated cardboard has a certain thickness, it can be understood that in a corrugated cardboard box of this configuration, when assembled into a box shape, the erected outer flaps interfere with the bending of the inner flaps.

[0004] Therefore, it has been considered to make the inner flaps easier to bend by diagonally cutting off the corner portions of the inner flaps. [[SUMMARY OF THE INVENTION]] [[Problem to be Solved by the Invention]]

[0005] However, when the corner portions of the inner flaps are diagonally cut off, cutting scraps are generated, which may potentially mix into the interior of the corrugated cardboard box when packaging articles. Therefore, there is still room for improvement in a structure that allows rapid assembly of a packaging box in which the top surface part and the bottom surface part are formed by inner flaps and outer flaps.

[0006] An object of the present invention is to provide a packaging box, which forms a top surface part and a bottom surface part with inner flaps and outer flaps, and can be rapidly assembled. [[Means for Solving the Problem]]

[0007] A first embodiment of the packaging box according to the present invention is a packaging box comprising a pair of top-side inner flaps and a pair of top-side outer flaps forming a top surface, a pair of bottom-side inner flaps and a pair of bottom-side outer flaps forming a bottom surface, wherein at least one side of the top-side inner flaps and the bottom-side inner flaps is provided with crushed portions that overlap in part or in whole in two right-angled triangular regions with the two corners of the inner flap on that side as vertices, respectively, a weakening line is formed on the hypotenuse of the right-angled triangle from the leading edge of the inner flap on that side to a predetermined position, and a cut line is formed in the right-angled triangle from the predetermined position to the side edge of the inner flap on that side.

[0008] A second embodiment of the packaging box according to the present invention is described as the first embodiment, characterized in that the hypotenuse of the right-angled triangle extends toward the inner short edge of the groove between the inner flap on one side and the outer flap on the one side, the notch is a straight line extending from the side edge of the inner flap on one side, and is inclined toward or perpendicular to the tip of the inner flap on one side with respect to the side edge of the inner flap on one side.

[0009] A third embodiment of the packaging box according to the present invention is described as the first or second embodiment, characterized in that the weakening line is a perforation or a lead line. [Effects of the Invention]

[0010] According to the present invention, it becomes possible to quickly assemble a packaging box in which the top and bottom surfaces are formed by an inner flap and an outer flap. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of a packaging box according to one embodiment of the present invention. [Figure 2] This is a plan view of a blank packaging box unfolded according to one embodiment of the present invention. [Figure 3]This is a partially enlarged plan view of a blank packaging box unfolded according to one embodiment of the present invention and a modified example thereof, where (a) is part IIIa of Figure 2 and (b) is part IIIa of Figure 2 in a modified example of one embodiment of the present invention. [Figure 4] This is an enlarged plan view of a blank portion of a packaging box that has been unfolded according to one embodiment of the present invention, and is a diagram for explaining the area around the inner flap folding support section on the left side of part IIIa in Figure 2. [Figure 5] This diagram illustrates the assembly of a packaging box according to one embodiment of the present invention, where (a) shows the state before the inner flap on the top side is folded, and (b) shows the state in the process of folding the inner flap on the top side. [Figure 6] This is an enlarged view of the state in which the inner flap on the top side of a packaging box according to one embodiment of the present invention and its modified form is being folded, where (a) is a view of the Va portion of Figure 4(b) from the width side, and (b) is a view of the Va portion of Figure 4(b) from the width side in a modified form of one embodiment of the present invention. [Modes for carrying out the invention]

[0012] The embodiments for carrying out the present invention will be described in detail below with reference to Figures 1 to 6. However, the present invention is not limited to the embodiments described here.

[0013] In this specification and the claims, "top surface" and "bottom surface" refer to the surfaces defined by the packaging box. However, these terms are for convenience only and do not define absolute positions in the direction of gravity. The same applies to terms such as "up" and "down."

[0014] Furthermore, in this specification and the claims, “right triangle” includes right triangles and approximate right triangles; “rectangle” includes rectangles, approximate rectangles, as well as squares and approximate squares; and “cuboid” includes cuboids, approximate cuboids, as well as cubes and approximate cubes. In addition, in this specification and the claims, “parallel” includes parallel lines as well as approximate parallel lines; and “orthogonal” includes orthogonal lines as well as approximate orthogonal lines.

[0015] <Structure of the packaging box> Figure 1 is a perspective view of a packaging box 10 according to one embodiment of the present invention, and Figure 2 is a plan view of the blank 10B when the packaging box 10 according to this embodiment is unfolded. Furthermore, Figure 3(a) is a partially enlarged plan view of the blank 10B when the packaging box 10 according to this embodiment is unfolded, and corresponds to part IIIa of Figure 2.

[0016] The packaging box according to the present invention is capable of containing articles, but the articles contained may be any articles as long as the effects of the present invention are realized. Furthermore, the packaging box according to the present invention is a packaging box made of corrugated cardboard sheet material, and the corrugated cardboard box 10 according to this embodiment is, as described above, a grooved type (02 type) as defined in JIS Z 1507, and the top surface is formed by folding a pair of inner flaps inward and then folding a pair of outer flaps on top of them so that their edges abut. Here, "folding a pair of outer flaps so that their edges abut" does not mean that the edges must abut completely, and for example, so-called short flaps are also included in the present invention. In addition, in the present invention, corrugated cardboard boxes other than the grooved type (02 type) as defined in JIS Z 1507 are also acceptable as long as the top surface is formed by folding a pair of inner flaps inward and then folding a pair of outer flaps on top of them so that their edges abut.

[0017] The packaging box 10 according to the present embodiment, as shown in FIGS. 1 to 3(a), includes a pair of top-side inner flaps 22a, 22b and a pair of top-side outer flaps 21a, 21b that form a top surface portion 20. Crushed portions 42 are provided on the top-side inner flaps 22a, 22b respectively in two right-angled triangular regions 41 having both corners of the top-side inner flaps 22a, 22b as apex angles, such that part or all of the crushed portions 42 overlap each other. A weakened line 45 is formed on the hypotenuse 43 of the right triangle from the distal edge 221 of the top-side inner flaps 22a, 22b to a predetermined position 44, and a cut line 46 is formed in the right triangle from the predetermined position 44 to the side edge 222 of the top-side inner flaps 22a, 22b.

[0018] According to this configuration, the packaging box 10 in which the top surface portion 20 is formed by the top-side inner flaps 22a, 22b and the top-side outer flaps 21a, 21b can be assembled quickly.

[0019] In the present embodiment, reference numeral 40 shown in FIG. 2 and FIG. 3(a) described later is an inner flap folding assisting portion, which includes a right-angled triangular region 41, a crushed portion 42, a weakened line 45, and a cut line 46. In the present embodiment, the inner flap folding assisting portions 40 are respectively provided near both corners of the top-side inner flaps 22a, 22b. In each top-side inner flap, the left and right inner flap folding assisting portions 40 are left-right symmetrical. In the present embodiment, the predetermined position 44 represents the intersection of the weakened line 45 and the cut line 46.

[0020] The packaging box 10 according to the present embodiment, as shown in FIGS. 1 and 2, forms a rectangular parallelepiped with a rectangular top surface portion 20, a rectangular bottom surface portion 30, a pair of rectangular side surface portions (length surfaces) 11a, 11b, and a pair of rectangular side surface portions (width surfaces) 12a, 12b.

[0021] Note that the present invention is not limited to the embodiment in which the inner flap folding assisting portions 40 are provided on the top-side inner flaps 22a and 22b. Instead of or in addition to the embodiment in which the inner flap folding assisting portions 40 are provided on the top-side inner flaps 22a and 22b, an embodiment in which the inner flap folding assisting portions 40 are provided on the bottom-side inner flaps 32a and 32b forming the bottom surface portion 30 is also permissible.

[0022] According to this configuration, in the packaging box 10 in which the top surface portion 20 is formed by the top-side inner flaps 22a, 22b and the top-side outer flaps 21a, 21b, and the bottom surface portion 30 is formed by the bottom-side inner flaps 32a, 32b and the bottom-side outer flaps 31a, 31b, the inner flap provided with the inner flap folding assisting portion 40 can be assembled quickly.

[0023] Furthermore, in the packaging box 10 according to the present embodiment, as shown in Fig. 3(a), the hypotenuse 43 of the right-angled triangle extends toward the inner short end edge 231 of the score groove 23 between the top-side inner flaps 22a, 22b and the top-side outer flaps 21a, 21b, and the score line 46 is a linear shape extending from a point 222c (the center of the side end edge 222 in the present embodiment) on the side end edge 222 of the top-side inner flaps 22a, 22b, and is inclined toward the tip end of the top-side inner flaps 22a, 22b with respect to the side end edge 222 of the top-side inner flaps 22a, 22b. In the present embodiment, the score line 46 is inclined at about 45 degrees with respect to the side end edge 222, but the present invention is not limited to this. Here, in the present embodiment, as shown in Fig. 3(a), a straight line 43e obtained by extending the hypotenuse 43 of the right-angled triangle passes through the center of the inner short end edge 231 of the score groove 23, and the right-angled triangle region 41 on the left side shown in Fig. 3(a) is in the shape of a right-angled triangle having the corner of the top-side inner flap 22a as the right-angled apex and the intersection of the side end edge 222 and the straight line 43 as an apex.

[0024] Furthermore, in the packaging box 10 according to the present embodiment, the weakening line 45 is a perforation or a lead rule. A lead rule is a rule with intermittent cuts formed on the rule line.

[0025] Figure 3(b) is an enlarged plan view of a blank section of a modified packaging box according to this embodiment, which corresponds to section IIIa in Figure 2. Among the elements constituting the packaging box according to this modified embodiment, those having similar functions are denoted by the same reference numerals as in the above embodiment, and their descriptions are omitted.

[0026] In the modified packaging box, as shown in Figure 3(b), the cut line 46' is a straight line extending from a point (the center of the side edge 222 in this modified example) 222c on the side edge 222 of the top inner flaps 22a and 22b, and is perpendicular to the side edge 222 of the top inner flaps 22a and 22b. In this modified example, the predetermined position 44' represents the intersection of the weakening line 45' and the cut line 46'. With this configuration, similar to the above embodiment, it becomes possible to quickly assemble the packaging box 10, which forms the top surface 20 with the top inner flaps 22a and 22b and the top outer flaps 21a and 21b.

[0027] Figure 4 is a partially enlarged plan view of the blank 10B when the packaging box 10 according to this embodiment is unfolded, and is a diagram for explaining the area around the inner flap folding support section 40 on the left side of part IIIa in Figure 2.

[0028] With respect to the starting point 222c of the notch line 46 on the side edge 222 of the top inner flap 22a, the ratio in the extension direction of the top inner flap 22a is expressed as A:B (or B / A+B), where A is the distance from the leading edge 221 of the top inner flap 22a to the starting point 222c, and B is the distance from the inner short edge 231 of the groove 23 to the starting point 222c. In this embodiment, the starting point 222c is the center of the side edge 222, but in the present invention, it does not have to be the center of the side edge 222.

[0029] In this invention, B is preferably 1 / 5 to 4 / 5 of A+B in order to achieve the effects of the present invention. In this embodiment and the above modifications, B is 1 / 2 of A+B.

[0030] Regarding the inclination of the hypotenuse 43 of the right-angled triangular region 41, the angle α formed by the side edge 222 and the hypotenuse 43 is preferably 20.0 degrees or less in order to achieve the effects of the present invention (i.e., the angle formed by the side edge 222 and the tip edge 221 is preferably 70 degrees or more in order to achieve the effects of the present invention).

[0031] <blank> Returning to Figure 2, in the blank (also called a blank sheet) 10B of the packaging box 10 in this embodiment, the first side portion 11a is connected to the second side portion 12a via the first fold line L1. The second side portion 12a is connected to the third side portion 11b via the second fold line L2, and the third side portion 11b is connected to the fourth side portion 12b via the third fold line L3. The blank 10B in this embodiment includes a splice 13 for connecting the first side portion 11a and the fourth side portion 12b. The splice 13 is connected to the first side portion 11a via the fourth fold line L4. Note that the splice 13 may be connected from the fourth side portion 12b instead of the first side portion 11a.

[0032] In the blank 10B of this embodiment, as shown in Figure 2, a pair of first top-side outer flaps 21a and 21b are connected to the first side portion 11a and the third side portion 11b via a pair of fifth fold lines L5, respectively, and a pair of second top-side inner flaps 22a and 22b are connected to the second side portion 12a and the fourth side portion 12b via a sixth fold line L6, respectively. In addition, a pair of first bottom-side outer flaps 31a and 31b are connected to the first side portion 11a and the third side portion 11b via a seventh fold line L7, respectively, and a pair of second bottom-side inner flaps 32a and 32b are connected to the second side portion 12a and the fourth side portion 12b via an eighth fold line L8, respectively.

[0033] In the blank 10B of this embodiment, as shown in Figure 2, the inner flap bending support section 40 is provided near both corners of the top-side inner flaps 22a and 22b, respectively.

[0034] In the blank 10B of this embodiment, the first fold line L1 to the fourth fold line L4 are set to become the vertical creases of the corrugated cardboard, and the fifth fold line L5 to the eighth fold line L8 are set to become the horizontal creases of the corrugated cardboard. However, the direction in which the creases are formed is not limited to this, and they may be formed in any direction as long as the objective of the present invention can be achieved.

[0035] <Assembly> The packaging box 10 according to this embodiment can be assembled by hand from a sleeve state in which the joint portion 13 and the fourth side portion 12b are bonded and connected from a blank 10B state, but it can also be assembled by machine. The packaging boxes 10 are usually stored in bundles of multiple boxes and supplied to the user, where they are assembled into a box shape by an assembly device (box making device).

[0036] Figure 5 is a diagram illustrating the assembly of the packaging box 10 according to this embodiment. Figure 5(a) shows the state before the top inner flaps 22a and 22b are folded, and Figure 5(b) shows the state in which the top inner flaps 22a and 22b are being folded. Figure 6 is an enlarged view of the state in which the top inner flaps of the packaging box according to this embodiment and its modified example are being folded. Figure 6(a) shows the Va portion of Figure 5(b) viewed from the width side, and Figure 6(b) shows the Va portion of Figure 5(b) in the modified example of this embodiment viewed from the width side.

[0037] As shown in Figure 5(a), for example, in the top (lid) forming station of the assembly device, the blank 10B is formed into a rectangular tube shape, bonded at the joint 13, and sealed to the bottom 30, and the four top-side flaps 21a, 21b, 22a, and 22b are transported in an upright state. At this time, the first bending member 50 of the assembly device bends the opposing top-side inner flaps 22a and 22b inward from both sides. As shown in Figure 5(b), when folding, flexible crushing sections 42, weakening lines 45, and notches 46 are provided near the corners of the top inner flaps 22a and 22b of the packaging box 10. Therefore, even if the top inner flaps 22a and 22b interfere with the upright top outer flaps 21a and 21b, the crushing sections 42 of the top inner flaps 22a and 22b will bend, and the notches 46 will initiate the bending of the crushing sections 42 via the weakening lines 45, making it easier for the inner flaps 22a and 22b to be folded inward by the inner flap folding support section 40 (see Figure 6(a)). Following the bending of the inner top flaps 22a and 22b, a second bending member (not shown) bends inward from both sides of the opposing outer top flaps 21a and 21b to form the top portion 20 (lid).

[0038] In the modified embodiment described above, as in the embodiment described above, when the first bending member 50 of the assembly device folds the opposing top-side inner flaps 22a and 22b inward from both sides, a flexible crushing portion 42', a weakening line 45', and a cut line 46' are provided near the corners of the top-side inner flaps 22a and 22b of the packaging box 10. Therefore, even if the top-side inner flaps 22a and 22b interfere with the upright top-side outer flaps 21a and 21b, the crushing portion 42' of the top-side inner flaps 22a and 22b bends, and the crushing portion 42' becomes easier to fold via the weakening line 45' using the cut line 46' as a starting point, allowing the top-side inner flaps 22a and 22b to be easily folded inward by the inner flap bending support portion 40' (see Figure 6(b)).

[0039] Next, an example of a method for manufacturing the packaging box 10 described above will be explained. The method for manufacturing the packaging box 10 according to this embodiment may include, for example, a printing step, a creasing step, a grooving step, a die pressing step, and a joining step. The manufacturing method of the present invention can use conventionally known equipment.

[0040] In the manufacturing of the packaging box 10 in this embodiment, first, printing is performed on the surface of the corrugated cardboard sheet, then fold lines (creases) are formed on the corrugated cardboard sheet, and further, grooves (slits) 23 for forming flaps are formed on the corrugated cardboard sheet.

[0041] Next, crushed sections 42 are formed at both corners of the inner flaps 22a and 22b on the top surfaces of the two corrugated cardboard sheets, weakening lines 45 are formed, and cut lines 46 are formed. These crushed sections 42 can be formed by pressing with a mold for forming crushed sections.

[0042] As described above, after the inner flap folding support section 40 is provided, the corrugated cardboard sheet is folded into a rectangular tube shape, the joint 13 is glued, and the bottom is sealed to form a packaging box 10 with two pairs of top flaps erected.

[0043] The present invention is not limited to the embodiments described above or the modifications mentioned throughout, and can be modified or altered as appropriate without departing from the technical spirit of the present invention. [Explanation of symbols]

[0044] 10 packaging box 10B Blank 11a First side part 12a Second side part 11b Third side part 12b 4th side part 13 Succession 20 Top section 21a, 21b First top side outer flap 22a, 22b Second top side inner flap 221 Tip edge 222 Side edge 222c Starting point of the cutting line 23 Grooving 231 Inner short edge 30 Bottom part 31a, 31b First bottom side outer flap 32a, 32b Second bottom side inner flap 40, 40' Inner flap folding support section 41 Right-angled triangular region 42, 42' Crushed section 43. Hypotenuse of a right triangle 44, 44' in place 45, 45' Weak line 46, 46' Cut line

Claims

1. A packaging box comprising a pair of top-side inner flaps and a pair of top-side outer flaps forming the top surface, and a pair of bottom-side inner flaps and a pair of bottom-side outer flaps forming the bottom surface, On at least one side of the top inner flap and the bottom inner flap, a crushed portion is provided such that it partially or completely overlaps in two right-angled triangular regions, with the two corners of the inner flap on that side as its vertices. Along the hypotenuse of the right-angled triangle, a weakening line is formed from the tip edge of the inner flap on one side to a predetermined position. A packaging box characterized in that, in the right-angled triangle, a cut line is formed from the predetermined position to the side edge of the inner flap on one side.

2. The hypotenuse of the right-angled triangle extends toward the inner short edge of the groove between the inner flap and the outer flap on one side. The packaging box according to claim 1, characterized in that the cut line is a straight line extending from the side edge of the inner flap on one side, and is inclined or perpendicular to the side edge of the inner flap on one side toward the tip of the inner flap on one side.

3. The packaging box according to claim 1 or 2, characterized in that the aforementioned weakening line is a perforation or a lead line.

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