JP2000355322A - Foldable box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foldable box in which its weight is light, it has a superior strength and durability, its folding and assembly to the box may easily be carried out, its structure is simple, its manufacturing is easy and its large- sized formation can be attained. SOLUTION: There is provided a box comprised of a pair of first opposing side plates 1, a pair of second opposing plates 2 positioned between both first side plates and a bottom plate. Each of the side plates 1, 2 has an extended portion constituting a part of the bottom plate. Both extended portions of each of two sets of adjoining first side plate 1 and second side plate 2 are connected to each other to constitute a part of the bottom plate under a state in which a box-like form is made, and both extended portions of the second side plate 2 have folding lines 8 where the bottom plate can be folded inside when the side plates are folded to attain a foldable box made of plastic cardboard.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic cardboard box which can be easily assembled from a folded state, and can be easily folded and reassembled.

[0002]

2. Description of the Related Art Hitherto, a foldable box has been known to be easily transported and stored before use, and a box to be assembled at the time of use has been used for moving and packaging and storing various products. Conventionally, as a foldable box, paper cardboard has been mainly used, but there are problems in strength, water resistance, durability and the like, and it has been difficult to reuse the box. For this reason, paper cardboard is disposable, is collected as waste if necessary, and is recycled into cardboard as pulp raw material. However, this recycling increases the cost, including the use of energy required for recovery and regeneration, and as a result, may go against resource saving.

[0003] For this reason, foldable plastic boxes (containers) that can be used repeatedly without being discarded have attracted attention in terms of environmental measures, functionality, and total cost. Among them, plastic corrugated cardboard has a three-layer structure consisting of a surface layer and a hollow structure using polypropylene resin, polyethylene resin, etc. as main raw materials, and is excellent in lightness, water resistance, impact resistance, durability, etc. Various types of folding containers using plastic cardboard have been proposed. Among them, the most basic one is that each of the portions extending from the four side plates is bent and combined to form a bottom plate. However, the bottom is weak, and the bottom cannot be folded and assembled with one touch.

For this reason, various foldable boxes have been proposed. For example, JP-A-6-135440 and JP-A-8-2524 disclose that in a foldable box comprising a bottom plate and four side plates, two opposing side plates have a folding screen structure. A box has been proposed in which the volume can be reduced by folding the folding screen part inward and folding the other opposing side plate inward. In this case, it has also been proposed to form a hook portion that can be pulled by the side plate of the folding screen structure, and forcibly start the bent side plate by the hook portion.

[0005] These boxes can be folded flat and compactly. However, since the box is composed of a plurality of members and these joining means are required, the structure becomes complicated, and there is a problem in manufacturing and assembling. In addition, one set of side plates is folded in a folding screen, and in order to form the folds, it is necessary to cut a part of the plastic cardboard substrate, which may cause a problem of reduced strength. For this reason, in order to solve this problem, the structure is further complicated, such as providing a reinforcing member at the bottom plate or the opening edge of the box, and a decrease in productivity is expected.

Japanese Patent Application Laid-Open No. 6-24440 discloses that a pair of side plates opposed to a bottom plate to which an upper and lower reinforcing frame and a lower reinforcing frame are fixed are fixed to the upper and lower reinforcing frames, and the intermediate position in the height direction and the vertical position. It has a hinge near the joint with the reinforcing frame, and the other pair of opposing side plates has a hinge near the upper and lower reinforcing frames, and fits between the upper and lower reinforcing frames in a state where the side plates are folded inward. There is disclosed a returnable box which can be folded by engaging with a projection, and a new returnable box provided with a spring and an inner plate for urging the other pair of side plates in the rising direction to improve the independence of the hinge portion. . This box also has substantially the same basic structure as that of the box, and is provided with a plurality of bends that bend the side plate at the time of assembly, has a problem in strength, is difficult to stack, and requires a plurality of members. There is a problem.

Further, Japanese Patent Application Laid-Open No. 6-64644 discloses that two opposing first side walls which can be bent vertically in the center and two other opposing rectangular side walls are bent mutually. A box having a bottom surface connected so as to be able to be bent and a central portion of the bottom surface to be bent upward has been proposed, and as its material, cardboard or other thick paper or a thin synthetic resin plate has been disclosed. This box differs essentially from the above in that the folding direction is up and down. Further, the bottom surface is continuous with the side wall, and differs in the number of members. However, in order to maintain the fold in a box shape, a frame member is required around the opening, and this frame member also needs a means for allowing the side wall to be folded and returned, and is structurally required. It's still complicated. In addition, the strength of the bottom surface is low, and the size and use of the box are limited.

[0008] JP-A-6-298245, JP-A-6-298245
JP-A-32-233 and JP-A-7-300130 propose a foldable box using the above-mentioned folding mechanism having a basic longitudinally foldable side wall and having improved bottom surface strength, bendability, and the like. ing. However, there is no change to the basic structure of having a bending line in the vertical direction.

[0009]

SUMMARY OF THE INVENTION The present invention is lightweight, easy to fold and assemble into a box, has excellent strength and durability, has a simple structure as a whole, is easy to manufacture, and has a large size. It is an object of the present invention to provide a collapsible box that can be operated.

[0010]

DISCLOSURE OF THE INVENTION The present invention has a bottom plate integrated with a side plate, which has excellent strength, water resistance and durability, can be used repeatedly, and can be re-melted and recycled after use. By folding it, it can be folded, and when folding back the side plate and assembling it into a box,
The bottom plate is easily folded back to form the bottom plate, and is made of a plastic cardboard box having excellent strength.

That is, the present invention provides: (1) In a box comprising a first side plate facing each other and a second side plate facing each other and a bottom plate, each side plate has: It has an extension part that constitutes a part of the bottom plate, and the two extension parts of the two adjacent first side plates and the second side plate are combined to form a part of the bottom plate in a box shape. A collapsible box made of a plastic corrugated ball having, at both extensions of the second side plate, a folding line whose bottom plate can be folded inside the side plate when the side plate is folded. (2) The foldable box according to (1), wherein one of the bottom plates formed by the extension of the first side plate has an area of 90% or more of the bottom plate surface. (3) The foldable box according to the above (1) or (2), comprising a plastic corrugated ball having a hollow portion formed in a vertical direction of the side plate. (4) The foldable box according to any one of the above (1) to (3), wherein the four side plates have a double side plate structure bent inward by a hinge. (5) The foldable box according to any one of (1) to (3), wherein an upper portion of at least one side plate forms a lid with a hinge. (6) A foldable box according to any one of (1) to (5), wherein both the extension portions of the first side plate and the second side plate are detachably joined.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The collapsible box of the present invention can be stored before use of the box,
For transportation, transportation for reuse, storage, etc.
Folding, occupied area and occupied volume are reduced,
When used, it is a plastic cardboard box that can be assembled with one touch, and has excellent strength, stability, and durability.

Hereinafter, a foldable box according to an embodiment of the present invention will be described with reference to the drawings. The foldable box of the present invention is that the box of the present invention withstands repeated use, has high strength, is durable, and has water resistance. Use plastic cardboard. Plastic corrugated cardboard is a lightweight plate-like material usually formed of both surface layer portions and a core portion having a hollow portion. The plastic material is not particularly limited, but generally includes a polypropylene-based resin, a high-density polyethylene, or a resin containing a filler such as talc.

[0014] These plastic cardboards are not particularly limited and are known in the art. For example, the following two types can be exemplified from the structure thereof. First, the core has a hollow portion continuous in the longitudinal direction. Of this type,
Although productivity is high in that manufacturing is performed continuously, there is directionality in strength. Another feature is that the core has a honeycomb structure, has no directionality in strength, and is uniform. In the present invention, either type can be used. However, as a box, strength in the vertical direction such as stacking is often required, and the use of a continuous hollow type is preferable. The thickness and strength of the plastic cardboard can be appropriately selected in consideration of the size of the box, the purpose of use, and the like. Its thickness is usually 1 to 10 mm.

FIG. 1 is an exploded view of a blank cut out of plastic cardboard for producing the foldable box of the present invention. In FIG. 1, reference numeral 1 denotes a first side plate, 2 denotes a second side plate, 3 denotes a coupling allowance, 4 denotes a side plate forming vertical mountain fold line, 5
Indicates a bottom plate forming mountain fold line, and 6 indicates a valley fold line for folding. In addition, 1a, 1b, 2a, and 2b are extensions from the side plate, and indicate portions for forming a bottom plate.

An example of how to assemble the cut material plate into a box shown in FIG. 1 will be described. First, the box side plate forming vertical mountain fold line 4 is folded so as to have an angle of 90 degrees, and the side plate on the side opposite to the joining margin 3 is joined to form a rectangular tube. Next, the extension 1 of the side plate forming the bottom plate
The box-like body is apparently formed by bending a, 1b, 2a, and 2b by 90 degrees from the bottom plate forming mountain fold line 5.

In the case of a general box, the plurality of extensions for forming the bottom plate are １ ／ of the shorter length between the opposing side plates, and are welded together so that the box-like body can be maintained. It is fixed with a screw, a stapler-type stopper, an adhesive tape, or the like. However, in this case, until the contents are taken out and reused, they must be stored and transported while maintaining the shape of the box. Poor reuse efficiency. Therefore,
Remove the stapler, peel off the adhesive tape,
Fold so that the side plate is doubled, and again when reusing,
They were assembled in a box and fixed with staples, screws, and adhesive tape. However, in these methods, in addition to the necessity of auxiliary materials, work efficiency is poor, and fixing with a stapler or an adhesive tape is substantially difficult as compared with a paper corrugated ball.

The foldable box of the present invention is to use plastic corrugated cardboard, to form the four extended portions constituting the bottom plate into a specific shape, and to specify the connecting portion thereof. The box is formed by first turning the rectangular tube upside down.
Next, the bottom plate forming part is 9a in the order of 1a, 2b, 1b and 2a.
Bend 0 degrees. Thereby, the bottom plate of the box is formed.
Next, the bottom plate for functioning as a box is joined. 2 is a view of the bottom plate of the box as viewed from above, and FIG. 3 is a view of the bottom plate of the box as viewed from below. In FIG. 3, reference numeral 7 denotes a thick perforation, 8 denotes a folding start point, and 9 denotes a connecting portion.

Next, two adjacent sheets, which are partially folded, are fixed. That is, the opposing side plates 2
As shown in FIG. 3, the extended portions 2a and 2b have a point-symmetrical shape, and have a valley fold line 6 in a direction of α: 45 degrees from the folding start point 8. A part 2a1 of the bottom plate 2a and an adjacent 1a are overlapped and joined. Similarly, 2b1, which is a part of the bottom plate 2b, and the adjacent 1b are joined. That is, the bottom plate portion, which is an extension of the four side plates, is only the combination of two adjacent plates. In addition, it is essential that the connecting portion is only on the center side of the valley fold line 6, which is two fold lines. Further, 1b needs to have a shape that does not exceed the joint of 1a and 2a.

Here, the two adjacent bonds 9 are formed by partial fusion, planar fusion, adhesion with an adhesive, or the like. Above all, in the case of fusion, a heat and pressure fusion means is generally used, and partial fusion is preferred from the viewpoint of appearance and the like. In addition, as a heating means for fusion, general electric heating,
Ultrasonic heating, high frequency heating, etc. can be adopted. Further, as the coupling means, in addition to the above-mentioned non-removable coupling, a detachable coupling means such as a screw, a concave / convex fitting, a hook-and-loop fastener, a magnetic tape or the like can be adopted.

That is, since the force for detaching the connecting portion acts in the plate direction of the connecting portion of the bottom plate, the detachable type may be sufficient. In the case where this connection is a detachable type, by attaching and detaching at the time of folding, the bottom plate portion can be extended to the side plate without being folded. As a result, although the occupied area is widened, there is an effect that the folding becomes easy and the thickness can be reduced.

In this way, the box having the joined bottom plate can be used by applying a force in the direction of the arrow in FIG.
When the box 8 is folded at the corner 8 of the box, the bottom plate is folded inward of the side plate along the valley fold line. FIG. 4 shows the bottom surface of the box being folded. Here, since the connection between the adjacent bottom plates is made only on one side of the folding line 6, the bottom plate forming portions 1a and 1b do not break, and the bottom plates are formed by the large areas 1a and 1b as they are. Will be
The strength of the bottom plate is ensured. That is, one sheet of the bottom plate formed by the extension of the side plate can have a large area of 90% or more of the bottom plate surface.

The foldable box of the present invention can be folded by the above-described structure, but is shown in FIGS. 1 and 2 so that it can be easily folded with a small force at the start of folding. As described above, it is desirable to cut out the shape of 1a so that the end that comes into contact with the side wall at the start of folding is at an angle β. Is usually about 3 to 20 degrees. In addition, the valley folds are formed with thick perforations 7 so that the folds can be more easily folded.

The foldable box of the present invention basically has the function of the above-mentioned structure, and is a box whose upper part is open. In the present invention, in order to improve the strength of the box, a hinge is provided at a position about half the height of the side plate,
By folding the four side walls inward, the side walls can have a double structure. In this case, positioning can be performed by pushing the folded tip between the bottom plate material and the side plate. In this case, it is preferable that a plurality of slits are provided in the side wall portion of 1a, and a shape having a plurality of convex portions is provided at a distal end position of the side plate pushed into the slit, and the fitting is performed by pushing and fitting.

Such a box having a double side wall structure is preferable not only because the strength and rigidity of the side wall are approximately doubled but also in terms of the strength and appearance of the opening of the box. Furthermore, to improve the strength and stackability, it is also possible to provide a separate fitting member at the four corners of the opening. As this fitting member, while fitting and fixing to the opening edge corner of the box, It is preferable that the bottom of the box be stably received on the non-fitting side.

Further, the foldable box of the present invention can be formed as a box with a lid provided with a hinge by using the upper extension of the side wall. In this case, in the case of the double side wall structure, if necessary, a side plate can be separately inserted into the side plate portion continuous with the lid member to make the side plate double. Although the foldable box of the present invention has been described above, the present invention is not limited to these descriptions. For example, a plastic corrugated cardboard may have a non-directional core such as a honeycomb structure. Further, the cutting from the plastic cardboard was made into one sheet along the flow direction so as to coincide with the vertical direction of the box. However, depending on the width of the plastic cardboard and the size of the box, it may not be possible to cut out from one sheet. In such a case, the two side plates are used, the joint allowance is set at two places, and the joints are formed diagonally. It can also be provided.

The folding line and the folding line of the present invention are formed by a method using a pressing bar, a method using a pressing ring, or the like. In this case, if necessary, the bar or ring on the pressing side can be heated. The foldable box of the present invention is colored, printed, painted, and the like as necessary, and can be used for packing of relocated luggage, various types of packaging, storage, and transportation of clothing, food, books, miscellaneous goods, and the like.

[0028]

According to the foldable box of the present invention, the box can be easily restored by folding and folding.
Excellent strength, rigidity, light weight, durability and water resistance. In addition, since the structure is simple, the amount of material used is small and the manufacture is easy. Therefore, it can be used repeatedly, and the occupied area and the occupied volume for storing and transporting empty boxes are small, which leads to cost reduction. Furthermore, it is excellent in recyclability at the time of disposal and can contribute to resource saving by reuse.

[Brief description of the drawings]

FIG. 1 is an exploded view of a blank cut out of a plastic cardboard for manufacturing the foldable box of the present invention.

FIG. 2 is a top view of the bottom plate of the box.

FIG. 3 shows a bottom view of the bottom of the box.

FIG. 4 is a view of the bottom plate of the box being folded as viewed from below.

[Explanation of symbols]

 1: First side plate 2: Second side plate 3: Joining margin 4: Side plate forming vertical folding line 5: Bottom plate forming mountain folding line 6: Valley folding line 7: Thick perforation 8: Folding starting point 9: Joining portion

Claims (6)

[Claims] 1. A box comprising a first side plate facing each other, a second side plate facing the first side plate, and a bottom plate, each side plate constituting a part of the bottom plate. An extension portion, and two sets of adjacent first side plate and second side plate extension portions are combined to form a part of a bottom plate in a box shape, and a second side plate is provided. In both extensions,
A collapsible box made of plastic cardboard with a bottom plate having a foldable line inside the side plate when the side plate is folded. 2. The foldable box according to claim 1, wherein one of the bottom plates formed by the extension of the first side plate has an area of 90% or more of the bottom plate surface. 3. The foldable box according to claim 1, wherein the box is formed of a plastic corrugated ball having a hollow portion formed in a vertical direction of the side plate. 4. The foldable box according to claim 1, wherein the four side plates have a double side plate structure bent inward by hinges. 5. The foldable box according to claim 1, wherein an upper portion of at least one side plate forms a lid with a hinge. 6. The foldable box according to claim 1, wherein both extension portions of the first side plate and the second side plate are detachably joined.