JP2005014969A - Box for packaging - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a box for packaging, in which folding lines for inner flaps folded inward are formed at a level different from that for outer flaps folded outward on the bottom surface and top surface of the box body, yet acquiring a certain degree of compressive load resistance. <P>SOLUTION: In the top side of the box body, the folding lines 12 and 12 of the upper inner flaps 7 and 7 are formed to be lower than the folding lines 11 and 11 of the upper outer flaps 6 and 6, and weak resistance folding parts 13 and 13 having a folding strength weaker than other parts are formed below the folding lines 11 and 11 of the upper outer flaps 6 and 6, respectively. In the bottom side of the box, the folding lines 9 and 9 for the bottom inner flaps 5 and 5 are formed to be higher than those for the folding lines 8 and 8 of the bottom outer flaps 4 and 4, and weak resistance folding parts 10 and 10 having a folding strength weaker than other parts are formed above the folding lines 8 and 8 of the bottom outer flaps 4 and 4, respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a box-like packaging box made by folding a blank such as a corrugated board, and in particular, the blank is sequentially folded in the same direction along four parallel folding lines, and both end edges thereof are joined to form a rectangular cylindrical shape. The present invention relates to a packaging box of a type in which a body part is formed and an upper flap extended from the upper side of the body part is folded inward to close the upper surface of the box.
[0002]
[Prior art]
Conventionally, as one of the most common packaging containers, there is a box-shaped packaging box formed by bending a blank such as a corrugated board. For example, side panels that constitute a pair of opposing side faces and end panels that constitute a pair of opposing end faces of the box are alternately connected via a broken line, and the end side panel and the side edges of the end panel are joined together. As a result, a square cylindrical body is formed. Furthermore, the bottom outer flap and the bottom inner flap are respectively extended from the fold line on the lower side of the side panel and the end panel. After the bottom flap is folded inside the box, the bottom outer flap is folded outside and overlapped. The bottom of the box is closed. In addition, the upper outer flap and the upper inner flap are extended from the fold line on the upper side of the side panel and the end panel. After the upper inner flap is folded inside the box, the upper and outer flaps are folded outside and overlapped. The top of the box is closed.
[0003]
In such a packaging box, generally, the bottom inner flap and the bottom outer flap, or the upper inner flap and the upper outer flap have the same folding line height. However, when the folding line of the flap folded inward and the flap folded outward is the same height in this way, the flap folded outward is pushed up by the flap folded inward, and the upper surface before fixing the box or The bottom opens. In particular, when a thick corrugated board is used, the problem is remarkable.
[0004]
Therefore, for example, taking the upper surface side of the box as an example, a box is used in which the fold line of the upper and outer flaps is higher than the fold line of the upper and inner flaps by about the thickness of the corrugated board. In such a box, the height of the lower surface of the upper and outer flaps when folded inside the box is substantially equal to the upper surface of the upper and inner flaps folded first inside the box. The upper and outer flaps are not pushed up by the flap. Therefore, the appearance is good when assembled as a box, and the airtightness when sealed is increased.
[0005]
[Problems to be solved by the invention]
In the case of a general box with the same folding line height between the bottom inner flap and the bottom outer flap or the upper inner flap and the upper outer flap, the inner flap and the outer flap are respectively applied to the load in the direction in which the box is compressed. The end panel and the side panel receive loads simultaneously. On the other hand, when the heights of the fold lines of the inner flap and the outer flap are made different as described above, only the side panel is applied to the load as described above via the outer flap first folded outward. After receiving the load and buckling the side panel, the end panel receives the load via the inner flap folded inward. For this reason, the latter box as a whole is weak against the load in the direction of compressing the box, and cannot exhibit the load resistance of about half that of a general box. Therefore, the number of stacking stages allowed is limited.
[0006]
As described above, the present invention has a low compressive load resistance of the packaging box in which the height of the folding line of the inner flap folded inside at the bottom and top surfaces of the box is different from the height of the folding line of the outer flap folded outside. In view of the problem, even such a packaging box can obtain the same compressive load resistance as a general packaging box having the same folding line of the inner flap and the folding line of the outer flap. is there.
[0007]
[Means for Solving the Problems]
In the present invention, in order to achieve the above-mentioned object, for example, taking the upper surface of the box as an example, the folding lines 12 and 12 of the upper and inner flaps 7 and 7 are changed from the folding lines 11 and 11 of the upper and outer flaps 6 and 6 to the corrugated board. A box with a reduced thickness. In addition, when a compressive load is applied, the end panels 2 and 2 are respectively connected to upper and outer flaps 6 and 6 which are folded on the upper and inner flaps 7 and 7 which are folded inside the upper surface of the box. In order to receive a compressive load simultaneously with the side panels 1 and 1, weakly bent portions 13 and 13 having lower bending strength than other portions are formed below the folding lines 11 and 11 of the upper and outer flaps 6 and 6. .
[0008]
More specifically, the packaging box to which the present invention is applied has side panels 1 and 1 constituting a pair of opposed side surfaces and end panels 2 and 2 constituting a pair of opposed end surfaces of the box. The side panels 1 and 2 are joined alternately via the fold lines, the side edges of the side panels 1 and 2 are joined to each other, and the upper and outer flaps 6 and 6 are extended from the fold lines 11 and 11 of the upper side of the side panels 1 and 1, Upper inner flaps 7 and 7 are extended from the folding lines 12 and 12 on the upper sides of the end panels 2 and 2, the upper inner flaps 7 and 7 are bent inside the box, and then the upper and outer flaps 6 and 6 are bent outside thereof. It is the type that closes the top surface of the box.
[0009]
In the present invention, in such a packaging box, for example, on the upper surface side of the box body, the folding lines 12, 12 of the upper and inner flaps 7, 7 are formed lower than the folding lines 11, 11 of the upper and outer flaps 6, 6. In the upper and outer flaps 6 and 6, weakly bending portions 13 and 13 having lower bending strength than other portions are formed below the folding lines 11 and 11, respectively.
[0010]
Further, on the bottom side of the box, the folding lines 9 and 9 of the bottom inner flaps 5 and 5 are formed higher than the folding lines 8 and 8 of the bottom outer flaps 4 and 4, and the folding lines 8 and 8 of the bottom outer flaps 4 and 4 are further formed. On the upper side of 8, weakly bent portions 10 and 10 having a lower bending strength than other portions are formed.
[0011]
In such a packaging box, for example, taking the upper surface of the box as an example, when a compressive load is applied in the height direction of the box, the weakly bent parts 13 and 13 that have a lower bending strength than other parts are provided. Fold first. For this reason, the load applied to the upper and outer flaps 6 and 6 is applied to the upper and inner flaps 7 and 7 folded inside the upper surface of the box. Therefore, the side panels 1 and 1 and the end panels 2 and 2 receive a compressive load at the same time. For this reason, the packaging box with high compression load resistance is obtained.
[0012]
The center of the blank, which is a corrugated cardboard plate, is crushed into a groove shape along the fold lines 8, 8, 11, and 11, and the weakly bent portions 10, 10, 13, and 13 are portions of the fold lines 8, 8, 11, and 11, respectively. It is formed by crushing the core more shallowly. By doing so, the weakly bent portions 10, 10, 13, and 13 are more difficult to bend than the portions of the fold lines 8, 8, 11, and 11, but the bending strength is higher than the portions other than the fold lines 8, 8, 11, and 11. Weak and easy to break. As a result, the weakly bent portions 10, 10, 13, and 13 are bent only when a compressive load is applied to the box, and the desired effect can be obtained.
[0013]
In order to ensure that the end panels 2 and 2 and the side panels 1 and 1 are simultaneously subjected to a compressive load when the box is subjected to a compressive load, the height D of the weakly bent portions 13 and 13 is: It is preferable that the difference between the folding lines 11 and 11 of the upper and outer flaps 6 and 6 and the folding lines 12 and 12 of the upper and inner flaps 7 and 7 is greater than or equal to o. The same applies to the bottom side of the box. The height D of the weakly bent portions 10 and 10 is the difference between the fold lines 8 and 8 of the bottom outer flaps 4 and 4 and the fold lines 9 and 9 of the bottom flaps 5 and 5. It is good to be o or more.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described specifically and in detail with reference to the drawings.
FIG. 1 is a developed view of a blank of a main body of a general packaging box according to an embodiment of the present invention. The blank for the packaging box uses a corrugated board in which a core made of a corrugated sheet made of paper is laminated with a liner. A blank before assembly is completed by punching the corrugated board as shown by a solid line in FIG. 1 and by inserting a broken line as shown by a broken line.
[0015]
In the blank of the packaging box shown in FIG. 1, rectangular side panels 1 and 1 and end panels 2 and 2 are alternately connected via a broken line. The widths of the two side panels 1, 1 and the end panels 2, 2 (the left and right dimensions in FIG. 1 are the same hereinafter) are the same, and the widths of the side panels 1, 1 and the end panels 2, 2 are different. Needless to say, the height (upper and lower dimensions in FIG. 1, the same applies hereinafter) and width of the side panels 1 and 1 and the end panels 2 and 2 differ depending on the application, the size of the stored items, and the like.
[0016]
A joining flap 3 is extended from the side of the side panel 1 at the end via a broken line, and no such joining flap is extended to the end panel 2 at the end.
Outer bottom flaps 4, 4 extend from fold lines 8, 8 on the lower side of the side panels 1, 1. The width of the outer bottom flaps 4, 4 is slightly narrower than the width of the side panels 1, 1. Further, bottom flaps 5, 5 are extended from the fold lines 9, 9 on the lower side of the end panels 2, 2. The width of the bottom inner flaps 5 and 5 is slightly narrower than the width of the end panels 2 and 2. A slit-like cut is formed between the adjacent inner bottom flaps 5 and 5 and the outer bottom flaps 4 and 4.
[0017]
Upper and outer flaps 6, 6 extend from the fold lines 11, 11 on the upper side of the side panels 1, 1. The width of the upper and outer flaps 6 and 6 is slightly narrower than the width of the side panels 1 and 1. Further, upper inner flaps 7 and 7 extend from the fold lines 12 and 12 on the upper sides of the end panels 2 and 2. The width of the upper inner flaps 7 and 7 is slightly narrower than the width of the end panels 2 and 2. A slit-like cut is formed between the upper and inner flaps 7 and 7 and the upper and outer flaps 6 and 6.
[0018]
The height of the side panels 1 and 1 is a dimension between the fold lines 8 and 8 with the bottom outer flaps 4 and 4 on the lower side and the fold lines 11 and 11 with the upper and outer flaps 6 and 6 on the upper side. Moreover, the height of the end panels 2 and 2 is a dimension between the folding lines 12 and 12 with the bottom inner flaps 5 and 5 of the lower side, and the folding lines 9 and 9 with the upper inner flaps 7 and 7 of the upper side. .
[0019]
Here, the height of the side panels 1 and 1 is set slightly higher than the height of the end panels 2 and 2. Specifically, the bottom outer flaps 4 of the side panels 1 and 1, the fold lines 8 and 8 on the side are lower than the inner flaps 5 and 5 fold lines 9 and 9 of the end panels 2 and 2 by a dimension o (see FIG. 1 downward). Further, the folding lines 11 and 11 on the upper and outer flaps 6 and 6 side of the side panels 1 and 1 are above the folding lines 12 and 12 on the upper inner flaps 7 and 7 side of the end panels 2 and 2 by a dimension o (upper in FIG. 1). Direction). This deviation dimension o is usually 3 mm.
[0020]
Further, on the upper side of the folding lines 8 and 8 with the outer bottom flaps 4 and 4 of the side panels 1 and 1, as shown by hatching in FIG. 1, a weakly bent portion having a band-like bending strength weaker than other portions. 10 and 10 are formed. Similarly, on the lower side of the folding lines 11 and 11 of the side panels 1 and 1 with the upper and outer flaps 6 and 6, as shown by hatching in FIG. Folded portions 13 and 13 are formed.
[0021]
2A and 2B are views in which the vicinity of the fold lines 11 and 12 on the upper side of the side panel 1 and the end panel 2 are cut in a direction perpendicular to the fold lines 11 and 12, respectively. In the figure, the upper side is the inside of the box.
It is usual for the fold lines 11 and 12 to have a concave groove formed by crushing the core of the corrugated board on the inner side of the box so that it can be easily broken. The shift dimension between the folding lines 11 and 12 on the upper side of the side panel 1 and the end panel 2 is indicated by o, and this dimension o is generally 3 mm as described above.
[0022]
The weak bending portion 13 having a lower bending strength than the other portions is formed below the folding line 11 on the upper side of the side panels 1, 1, that is, the folding line 11 with the upper and outer flaps 6. ), The weakly bent portion 13 is formed by slightly crushed the core of the corrugated board constituting the blank. In addition to the weakly bent portion 13, other means such as impregnation with oils and fats that weaken the so-called stiffness of the portion of the corrugated board can be used. It is most convenient and easy to crush a little.
[0023]
The width D of the weakly bent portion 13 is equal to or larger than the displacement dimension o between the side folding lines 11 and 12 on the upper side of the side panel 1 and the end panel 2, that is, D ≧ o. For example, when o = 3 mm, D = 3 to 10 mm, and a particularly optimum dimension is D = 4 to 6 mm.
FIG. 3A shows an example of a step of forming the weakly bent portion 13 by crushing the core of the corrugated cardboard on the lower side of the folding line 11 at the same time when the groove of the folding line 11 is inserted. The inner surface of the corrugated board is pressed by a mold blade 15 having a ruled line type blade 16 that crushes the core of the fold line portion to make a groove, and a pressing mold blade 17 that crushes the core of the cardboard over the width D. Crush the center of the weakly bent part 13 at the same time. The pressing surface 18 of the pressing die 17 is slightly higher than the lower end of the ruled line type blade 16, and therefore, the weak core portion 13 is shallower than the groove of the folding line 11 and the core of the corrugated board is crushed. Further, in FIG. 3A, a gradient is formed such that the pressing surface 18 of the pressing blade 17 becomes higher as it goes from the ruled blade 16 side to the surface on the opposite side, and the weak bending portion 13 has this gradient. It is crushed shallowly as it leaves | separates from the broken line 11 substantially following.
[0024]
FIG. 2 (a ′) is a diagram showing another shape of the fold line 11 on the upper side of the side panel 1 and the weakly bent portion 13 formed on the lower side thereof, and shows the same section as FIG. 2 (a). As shown. FIG. 3A shows an example of a process for forming the groove of the broken line 11 and the weakly bent portion 13 shown in FIG.
[0025]
In this example, the gradient of the pressing surface 18 of the pressing die blade 17 as described above with reference to FIG. 3A is not formed, and the pressing surface 18 of the weak bending portion 13 has the center of the corrugated board over its entire width. It is almost uniformly crushed. The pressing die 17 is slightly retracted from the ruled line type blade 16, and the core of the corrugated board is crushed shallower than the groove of the folding line 11 in the weakly bent part 13 as in the above example.
[0026]
The lower folding lines 8 and 8 of the side panels 1 and 1, that is, the weak bending resistances 10 and 10 on the side of the folding lines 8 and 8 with the outer bottom flaps 4 and 4 of the side panels 1 and 1, are the above-described upper folding lines 11. The other structures are the same as those of the weakly bent portions 13 and 13 on the 11 side. That is, in FIGS. 2 (a) and 2 (b), only the top and bottom are reversed, and the description is omitted.
[0027]
A packaging box is assembled from such a blank as follows.
First, all the folding lines between the side panels 1, 1, the end panels 2, 2 and the joining flap 3 are bent in the same direction at an angle of 90 °. Further, paste is applied to the outer surface of the joining flap 3, and the outer surface of the joining flap 3 is attached to the inner surface of the end edge portion of the end panel 2. Thereby, a square cylindrical body is formed by the side panels 1 and 1 and the end panels 2 and 2.
[0028]
Next, after the side panel 1, 1 and the end panel 2, 2 form a square cylindrical body, the bottom of the box is closed. With the bottom of the box facing upward, that is, with the box upside down, the bottom flaps 5 and 5 are bent at an angle of about 90 ° to the bottom of the box. Next, the outer bottom flaps 4, 4 are bent at an angle of about 90 ° to the bottom surface side of the box, and both side portions thereof are overlaid on the inner bottom flaps 5, 5. Thereafter, the inner flaps 5 and 5 and the outer flaps 4 and 4 are fixed with staples, an adhesive, an adhesive tape, or the like.
[0029]
Next, the box is inverted and its upper surface is turned up. In this state, the stored items are stored from the upper surface of the opened box. Next, the upper surface of the box is closed.
First, as shown in FIG. 4, the upper inner flaps 7, 7 are bent at an angle of about 90 ° to the upper surface side of the box. Next, as shown in FIG. 5, the upper and outer flaps 6, 6 are bent at an angle of about 90 ° to the upper surface side of the box, and both side portions thereof are overlaid on the upper inner flaps 7, 7. Thereafter, the upper and inner flaps 7, 7 and the upper and outer flaps 6, 6 are fixed with staples, an adhesive, an adhesive tape or the like and sealed.
[0030]
In such a state, for example, on the upper surface side of the box, the upper and outer flaps 6 and 6 are folded at the folding lines 11 and 11 that are higher than the folding lines 12 and 12 of the upper and inner flaps 7 and 7 by the dimension o. When the upper and outer flaps 7 and 7 and the upper and outer flaps 6 and 6 are sequentially bent as described above and the upper surface of the box is closed, the upper and outer flaps 6 and 6 are not pushed up by the upper and inner flaps 7 and 7. . For this reason, the appearance is good when assembled as a box, and the airtightness when sealed is excellent.
[0031]
On the other hand, weakly bending portions 13 and 13 having lower bending strength than other portions of the blank over the width D are provided in portions below the folding lines 11 and 11 of the upper and outer flaps 6 and 6 that are stacked on the upper side. For this reason, when a compressive load is applied in the height direction of the box, the weakly bent portions 13 and 13 are deformed before the end panels 2 and 2, and the upper and outer flaps 6 and 6 and the upper and inner flaps 7 and 7. And completely overlap. Therefore, not only the end panels 2 and 2 but also the side panels 1 and 1 and the end panels 2 and 2 are simultaneously subjected to the compressive load. For this reason, the packaging box with high compression load resistance is obtained. The above-mentioned packaging box produced by the inventors of the present inventors was able to obtain the same compressive load resistance as that of a general packaging box having the same folding line of the inner flap and the folding line of the outer flap.
It should be noted that, on the bottom surface side of the box body, the action is completely the same except that the direction against the compressive load is upside down with respect to the top surface side of the box body.
[0032]
In the above description, terms such as “side panel” and “end panel” are used separately for the side face and end face of the hexahedron box, but the side face and end face of the box have a relative positional relationship. In the terminology shown, if a pair of opposed vertical surfaces are defined as side surfaces, another pair of opposed vertical surfaces orthogonal to those surfaces are merely end surfaces. As is apparent from the case of a box having a square plane, the side surfaces and end surfaces of the box having a legislative shape are only meaningful for distinguishing a pair of opposing vertical surfaces.
[0033]
【The invention's effect】
As explained above, in the packaging box according to the present invention, as a packaging box in which the height of the folding line of the inner flap folded inside at the bottom or top surface of the box body and the height of the folding line of the outer flap folded outside is different, A packaging box that has good appearance when assembled as a box and excellent airtightness when sealed is obtained. Moreover, the drawback of this type of packaging box, which is weak against the compressive load, is overcome, and a packaging box excellent in conveying efficiency and storage efficiency can be obtained, such as being able to stack many stages.
[Brief description of the drawings]
FIG. 1 shows an embodiment of a packaging box according to the present invention, and is a development view of a blank in a state where a corrugated cardboard or the like is cut to assemble a packaging box and a broken line is inserted.
2 is a cross-sectional view taken along lines AA and BB in FIG. 1 and an enlarged cross-sectional view of a main part showing a cross-sectional view taken along the line AA.
3 is an enlarged cross-sectional view of a main part showing a step of showing a core of a corrugated board with a ruled line type blade in a cross-sectional view taken along line AA in FIG. 1 and a cross-sectional view taken along line AA in FIG.
FIG. 4 is a perspective view seen from the upper surface side in a state where both upper and inner flaps are folded down to the upper surface side of the box in order to close the upper surface of the box in the embodiment of the packaging container.
5 is a perspective view of the packaging container as viewed from the upper surface side in a state where one upper and outer flaps are further tilted to the upper surface side of the box from the state of FIG. 4; FIG.
[Explanation of symbols]
1 side panel 2 end panel 4 bottom outside flap 5 bottom inside flap 6 top outside flap 7 top inside flap 8 bottom outside flap fold line 9 bottom inside flap fold line 10 bottom side weak fold part 11 top outside flap fold line 12 top Inner flap fold line 13 Upper weak fold part D Weak fold part height o Deviation of fold line between upper and outer flaps and upper and inner flaps

Claims (4)

It is a box for storing a stored item therein, and side panels (1) and (1) constituting a pair of opposed side surfaces, and end panels (2) and (2) constituting a pair of opposed end surfaces of the box. ) Are alternately connected via a fold line, the side edges of the end panel (1) and the end panel (2) are joined to each other, the fold line (11) on the upper side of the side panels (1) and (1), Upper and outer flaps (6) and (6) are extended from (11), and upper and inner flaps (7) and (7) are bent from the fold lines (12) and (12) on the upper side of the end panels (2) and (2). , And the upper and inner flaps (7) and (7) are folded inside the box, and then the upper and outer flaps (6) and (6) are folded and overlapped on the outside to close the upper surface of the box. In the upper and outer flaps (6), (6) fold line (11), (11) from the upper inner flap (7), (7) fold line (12), 12) is formed low, and further on the lower side of the folding lines (11) and (11) of the upper and outer flaps (6) and (6), the weak bending portion (13) having a lower bending strength than the other parts, A packaging box characterized by forming (13). It is a box for storing a stored item therein, and side panels (1) and (1) constituting a pair of opposed side surfaces, and end panels (2) and (2) constituting a pair of opposed end surfaces of the box. ) Are alternately connected via a fold line, the side edges of the end panel (1) and the end panel (2) are joined to each other, the fold line (8) on the lower side of the side panels (1) and (1), Outer bottom flaps (4), (4) are extended from (8), and bottom folding lines (9), (9) from end panels (2), (2) to inner flaps (5), (5) , And the bottom flaps (5) and (5) are folded inside the box, then the bottom outside flaps (4) and (4) are folded and overlapped to close the bottom of the box. , The bottom inner flaps (5), (5) fold lines (9), (9) are formed higher than the fold lines (8), (8) of the outer bottom flaps (4), (4). Further, weakly bent portions (10) and (10) having lower bending strength than other portions were formed above the folding lines (8) and (8) of the outer bottom flaps (4) and (4). A packaging box characterized by that. The center of the blank, which is a corrugated board, is crushed into a groove shape along the fold lines (8), (8), (11), and (11), and the weakly bent portions (10), (10), (13), The packaging according to claim 1 or 2, wherein (13) is formed by crushing the inner core shallower than the portion of the fold line (8), (8), (11), (11). Box. The height (D) of the weakly bent portions (10), (10), (13), and (13) is set to the fold lines (11) and (11) and the upper and inner flaps of the upper and outer flaps (6) and (6). (7), the deviation (o) from the folding lines (12), (12) of (7) or more, or the folding lines (8), (8) of the bottom bottom flaps (4), (4) and the bottom inner flap ( The packaging box according to any one of claims 1 to 3, wherein the difference is (o) or more from the broken lines (9) and (9) of 5) and (5).

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