JP2004067115A - Crease structure of multi-layered corrugated fiberboard and multi-layered corrugated fiberboard container including the structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crease structure of multi-layered corrugated fiberboard which has improved storability and assemblability before assembly by making a folding piece easy to fold and preventing a crease from weakening, and to provide a multi-layered corrugated fiberboard container including the structure. <P>SOLUTION: The crease structure of multi-layered corrugated fiberboard has the folding piece 11 formed at an end of a corrugated fiberboard base material 10, which can be folded along the crease 12. The crease 12 is formed, on the surface 11a on the folding side, with a continuous cut 12a consisting of consecutive cuts of a predetermined depth and a crushed dent 12b pressed into a recessed cross section along the continuous cut 12a. It is further formed, on the rear face 11b on the surface of the folding side, with an intermittent cut 12c comprising intermittently-formed cuts 12c1 of a predetermined depth extending along the continuous cut 12a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fold structure of a multi-layer corrugated cardboard for facilitating bending of the multi-layer corrugated cardboard, and a multi-layer corrugated cardboard container provided with the structure.
[0002]
[Prior art]
In the past, steel drums were used for containers for storing and transporting fluids such as fluids and powders.In recent years, however, recycling, cost, light weight, and storability have been considered. To improve, cardboard containers have been used.
Conventionally, this type of corrugated cardboard container has a rectangular body main body 111 and a sheet extending from the lower end of the body main body 111 by cutting a multilayer corrugated cardboard, for example, as shown in a multilayer corrugated cardboard container 100 shown in FIG. There is a corrugated board 110 formed by forming a corrugated board 110 including a plurality of bent pieces 112 provided (see FIG. 5A).
In this multilayered cardboard container 100, the trunk body 111 of the cardboard substrate 110 is folded in two in the left-right direction in FIG. 5A, and the folded cardboard substrate 110 is converted into a special machine (such as a gluer or a stitcher). ), The adhesive margin 113 on the left end is fixed to the right end of the body 111 by the dedicated machine.
Then, when used, the body main body 111 is bent into a rectangular cylindrical shape by manual work on site, and each bent piece 112 is further bent inward along the fold 110a (FIG. 5). (B)).
[0003]
However, according to the multilayered cardboard container 100 of the illustrated example, it is difficult to bend the bent piece portion 112 because it is formed of a high-strength multilayered cardboard.
Therefore, there is a case where the fold portion 110a is formed in a groove having a V-shaped cross section, which is a well-known technical means, so that the bending piece portion 112 can be easily bent. In addition to the high processing cost due to the use of a machine, the state before the cardboard substrate 110 is bent (the state shown in FIG. 5A) or the state in which the glue margin 113 is fixed by being folded in two as described above ( When stored in a state before being bent into a rectangular cylindrical shape), there is a problem that the fold 110a is bent and the bent piece 112 is bent.
Further, when the glue margin 113 is set on the above-mentioned dedicated machine (gluer or stitcher) in order to fasten the glue margin 113 to the right end of the body main body 111, the folded body main body 111 is vertically moved by the dedicated machine. 5A, there is also a problem that the fold 110a is bent and the bent piece 112 is bent.
[0004]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and aims at facilitating bending of a bent piece portion and preventing sagging of a fold portion, thereby improving storage stability before assembly. Another object of the present invention is to provide a fold structure of a multi-layer corrugated cardboard with improved assemblability and a multi-layer corrugated cardboard container provided with the structure.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a multi-layer corrugated cardboard fold structure in which a bent piece formed at an end of a corrugated cardboard substrate is bendable along a fold. The part is formed on the side of the fold side, a continuous cut part formed by continuous cuts of a predetermined depth, and a crushed concave part crushed into a concave cross section along the continuous cut part, and further formed on the fold side. An intermittent cut portion formed by intermittently arranging a cut of a predetermined depth is formed on the back surface of the surface along the continuous cut portion.
[0006]
According to the above technical means, when a slight bending force is applied to the fold portion in a state in which the bent piece portion is not bent, the cut end surfaces in the continuous cut portion abut against each other, thereby reducing the bending force. Since a reaction force is generated, the folded portion does not bend and bend.
Therefore, in the storage state before the bent piece is bent, or in the state where a slight pressing force is applied to the tip of the bent piece by a dedicated machine (gluer or stitcher) or the like, the set of the fold is generated. Absent.
Then, when bending the bent piece portion with a bending force of a predetermined force or more, the cut surface in the continuous cut portion is crushed and bent to the inside of the concave portion, and the tension is released by the intermittent cut portion on the back surface of the folded side surface. Therefore, it can be easily bent.
[0007]
Further, in the second invention, the bent piece portion is a short flap portion extending from an end of the corrugated cardboard substrate.
[0008]
Furthermore, the third invention is to form a substantially upright rectangular tubular body by bending a single corrugated cardboard substrate having the bent piece and the fold, and insert the bottom into the body. A multilayer corrugated cardboard container, wherein the corrugated cardboard substrate has a substantially rectangular main body that can be bent into a rectangular tube, and a plurality of bent pieces extending from a lower end of the main body. The above-mentioned fold portion that allows each bent piece portion to be bent inward, wherein the bottom portion is formed in a polygonal plate shape along the inner peripheral surface of the body portion, and the plurality of bent portions are bent. It is characterized in that it is placed on one piece.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1A and 1B show an example of a fold structure of a multilayer cardboard according to the present invention.
The fold structure A allows the bent piece 11 formed at the end of the corrugated cardboard substrate 10 to be bent along the fold 12.
[0010]
The corrugated cardboard base material 10 is obtained by cutting a so-called three-layer corrugated cardboard plate. It is configured in a three-layered shape that is sandwiched and bonded.
The number of layers of the corrugated cardboard substrate 10 is not limited to the illustrated example, but is preferably at least two or more.
[0011]
The bent piece portion 11 is a portion that is arranged on the end side of the corrugated cardboard substrate 10 and is bent when configuring a corrugated cardboard container or the like.
The length of the bent piece portion 11 in the extending direction (vertical direction in FIG. 1) is not particularly limited, and may be a so-called short flap whose length is relatively short.
[0012]
The fold portion 12 includes a continuous cut portion 12a formed by continuously making cuts of a predetermined depth on the fold side surface 11a, and a crushed concave portion 12b crushed into a concave cross section along the continuous cut portion 12a. Further, an intermittent cut portion 12c formed by intermittently disposing a cut 12c1 having a predetermined depth along the continuous cut portion 12a is formed on the back surface 11b of the folding-side surface.
[0013]
According to a preferred example of the present embodiment, the continuous cut portion 12a is a cut obtained by cutting the surface 11a on the fold side to the second layer, that is, the liners 10a1 and 10a2 and the inner ties 10b1 and 10b2.
[0014]
The crushed concave portion 12b is formed by pressing a mold having a predetermined shape against the continuous cut portion 12a, and according to a preferred example of the present embodiment, approximately from the surface 11a on the fold side to the second layer, 10a1 and 10a2 and sashes 10b1 and 10b2 are crushed.
[0015]
In addition, the depth of the said continuous cut part 12a and the said crushing recessed part 12b is not limited to the said example, It is set suitably so that the bending ease of the bending piece part 11 may be adjusted. For example, in order to make the bent piece portion 11 easy to bend, the depth of the continuous cut portion 12a and the crushed concave portion 12b may be made relatively deep, and in order to make the bent piece portion 11 hard to bend, The depth of the continuous cut portion 12a and the crushed concave portion 12b may be made relatively shallow.
[0016]
The intermittent cut portion 12c is formed by intermittently arranging a cut 12c1 having a depth to cut the liner 10a4 and the inner rim 10b3 from the back surface 11b to the first layer of the fold side surface along the continuous cut portion 12a. Become.
The length and the arrangement interval of the cuts 12c1 are appropriately set so as to adjust the ease of bending of the bent piece portion 11. For example, in order to make the bent piece portion 11 easily bendable, the length of the cut 12c1 may be made longer and the interval between the cut pieces 12c1 may be made smaller. What is necessary is just to shorten the length of the notch 12c1 and lengthen the arrangement interval.
[0017]
Thus, according to the fold structure A having the above-described structure, the bending force in the direction in which the fold side surface 11a is inward in a state where the bent piece portion 11 is not bent (the state of FIG. 5A). When added, the cut ends facing each other in the continuous cut portion 12a are in contact with each other, that is, the portions above and below the continuous cut portion 12a in the liners 10a1 and 10a2 and the inner fins 10b1 and 10b2 are in contact with each other. Thus, a reaction force to the bending force is generated. Therefore, when the bending force is relatively small, the state in which the bent piece portion 11 is not bent (the state of FIG. 5A) is maintained due to the reaction force.
[0018]
When the bending force is equal to or more than a predetermined force, the vicinity of the cut end face in the continuous cut portion 12a, that is, the vicinity of the continuous cut portion 12a in the liners 10a1 and 10a2 and the inner rims 10b1 and 10b2 is crushed inside. (See FIG. 5 (b)), and at the back surface 11b of the fold-side surface, the intermittent cut portions 12c are widened to release the tension, so that the bent piece portion 11 is easily bent. .
[0019]
Next, the multi-layer corrugated cardboard container 20 having the above-described fold structure A will be described in detail.
This multi-layer corrugated cardboard container 20 is formed by bending a single corrugated cardboard substrate 20 ′ to form a substantially upright octagonal cylindrical body 21, and inserting a bottom 22 into the body 21 (see FIG. 2), the corrugated cardboard substrate 20 ′ is provided with the bent pieces 11 and the folds 12 having the above configuration.
[0020]
The corrugated cardboard substrate 20 ′ is formed by cutting a three-layer corrugated cardboard into a predetermined shape, and has a substantially rectangular main body 21 a, a plurality of bent pieces 11 extending from the lower end of the main body 21 a, And a fold portion 12 that allows the bent piece portion 11 to be bent inward (see FIG. 3).
[0021]
The main body portion 21a has a substantially horizontally long rectangular shape that can be bent into a substantially octagonal cylindrical shape along a plurality of vertically arranged fold portions 21a1, and the glue margin portion 21a2 on the left end side in the drawing is the main body portion 21a. Is overlapped on the right end and is fixed. The fold portion 21a1 is a portion that is manually bent, and a concave portion that is crushed along the fold portion 21a1 is formed to facilitate the bending operation.
[0022]
In addition, the multilayer cardboard container 20 is provided with a fold portion 12 having the configuration of the fold structure A described above. The fold portion 12 is a so-called short flap having a relatively short length in the extending direction (vertical direction in FIG. 3), and the length thereof is set to at least opposing side surfaces 21 d, 21 d (FIG. ) Is set to be shorter than 1/2 of the distance between them.
[0023]
The bottom part 22 is formed in a polygonal plate shape along the inner peripheral surface of the body part 21 by cutting the same three-layer corrugated cardboard as the above-mentioned corrugated cardboard base material 20 ′, and the bottom part 22 is bent in the body part 21. Is placed on the bent piece part 11 of the first embodiment.
[0024]
Next, the assembling procedure of the multilayered cardboard container 20 having the above configuration will be described in detail.
First, the main body 21a of the corrugated cardboard substrate 20 'is manually folded in two along a substantially central fold 21a1 (a fold indicated by a symbol p in FIG. 3) in the left-right direction (the left-right direction in FIG. 3). Then, the glue margin 21a2 on the left end side of the main body 21a and the right end of the main body 21a are fixed to each other by a special machine (gluer or stitcher).
At that time, the corrugated cardboard substrate 20 'is folded in half and set on the dedicated machine in order to accurately fix the glue margin 21a2 to the right end of the main body 21a. The edges are aligned and transported by the dedicated machine. During these operations, the corrugated cardboard substrate 20 ′ is subjected to a bending force on each fold portion 12 by being sandwiched by the dedicated machine in the vertical direction (vertical direction in FIG. 3). The contact between the cut end faces of the continuous cut portions 12 a constituting the 12 generates a reaction force against the bending force, so that the bent piece portion 11 does not bend along the fold portion 12.
[0025]
Thereafter, the corrugated cardboard substrate 20 'is stored in a vertically folded state with the glue margin 21a2 fastened to the right end of the main body 21a. By the reaction force against the bending force due to the contact between the cut end surfaces of the portions 12a, the bending of the bent piece portion 11 is prevented.
[0026]
When the two-folded corrugated cardboard substrate 20 'is assembled at a site or the like, first, the main body 21a in the two-folded state is opened to form the substantially octagonal cylindrical body 21. Then, each bent piece portion 11 is bent inward along the fold portion 12 by a predetermined bending force. Note that these bending processes are usually performed manually, but may be performed using a dedicated machine.
Next, the bottom part 22 is inserted into the substantially octagonal cylindrical body part 21. The bottom portion 22 is placed on the plurality of bent pieces 11 bent in the body portion 21 and fixed by well-known fixing means such as bonding or taping (see FIG. 4).
[0027]
【The invention's effect】
The present invention is configured as described above, and has the following functions and effects.
ADVANTAGE OF THE INVENTION According to this invention, a bending piece part can be bent by bending force more than predetermined force, and especially when a bending piece part is a comparatively short so-called short flap part, it can be easily bent.
In addition, when the folded piece is stored before it is folded, or when a slight pressing force is applied to the tip of the folded piece by a special machine (gluer or stitcher), the continuous cut section However, since the cut end faces come into contact with each other to generate a reaction force against the bending force, the fold portion does not come loose.
Therefore, it is possible to improve the storability and assemblability before assembling by facilitating the bending of the bent pieces and preventing the set of the folds.
[Brief description of the drawings]
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an essential part showing an example of a fold structure of a multilayer corrugated cardboard according to the present invention, wherein (a) is a state before the multilayer corrugated cardboard is folded, and (b) is a state after the multilayer corrugated cardboard is folded. Is shown.
FIG. 2 is an exploded perspective view of the multi-layer corrugated cardboard container provided with the multi-layer corrugated cardboard crease structure.
FIG. 3 is a plan view of a corrugated cardboard substrate constituting a body of the multilayer cardboard container.
FIG. 4 is a sectional view of a main part of the multilayer cardboard container.
5A and 5B show an example of a conventional cardboard container, FIG. 5A is a developed view, and FIG. 5B is a sectional view of a main part.
[Explanation of symbols]
10: Corrugated cardboard substrate 11: Folded piece 12: Crease portion 12a: Continuous cut portion 12b: Crushed concave portion 12c: Intermittent cut portion 20: Multi-layer corrugated cardboard container 20 ': Corrugated cardboard substrate 21: Body 22: Bottom A: Crease structure

Claims (3)

A multi-layer corrugated cardboard fold structure that allows a bent piece formed at an end of a corrugated cardboard base to be bent along the fold,
The fold portion, on the surface of the fold side, a continuous cut portion formed by continuing a cut of a predetermined depth, and a crushed concave portion crushed into a concave cross-sectional shape along the continuous cut portion, further, A creased structure of a multilayer corrugated cardboard, wherein an intermittent cut portion formed by intermittently arranging cuts of a predetermined depth is formed along the continuous cut portion on the back surface of the fold side surface. . The fold structure for a multilayer corrugated cardboard according to claim 1, wherein the bent piece portion is a short flap portion extending from an end of the corrugated cardboard substrate. A multi-layer corrugated cardboard container formed by bending a single corrugated cardboard substrate having the bent piece portion and the fold portion to form a substantially upright rectangular tubular body and inserting a bottom into the body. hand,
The corrugated cardboard substrate has a substantially rectangular main body that can be bent into a rectangular cylindrical shape, a plurality of the above-mentioned bent pieces extending from a lower end of the main body, and bending each of the bent pieces inward. It is made up of the above folds,
The said bottom part is formed in the shape of a polygonal plate along the inner peripheral surface of the said trunk | drum, and is mounted on the said several bending piece part bent, The Claim 1 or 2 characterized by the above-mentioned. A multi-layer corrugated container having a multi-layer corrugated cardboard fold structure.

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