JPH09142461A - Foldable box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foldable box of which the recycling is easy, and at the same time, of which the finish in appearance is favorable by a method wherein for the foldable box which is constituted in such a manner that the peripheral wall is erected on the frame body of a bottom plate, a plurality of grooves for folding are provided into a a band-form element, and at the same time, stage parts are provided, and the foldable box is formed by superposing the stage parts each other. SOLUTION: A band-form element 13 to constitute a frame body 12 which is affixed to the peripheral edge of a bottom plate of a foldable box for the packaging of a food, etc., is constituted in such a manner that grooves 14 for folding are provided on the internal side of respective folding parts, and at the same time, stage parts 15, 16 are provided at both end parts. When the frame body 12 is formed by this method, the frame body 12 is connect-fixed by butting and affixing the stage parts 15, 16 each other, and at the connected part, the internal and external surfaces are smoothened. For the affixing, a glue or an adhesive may be applied, or an adhesive tape is affixed such as wrapping in from the internal surface to the external surface, and both end parts may be integrally fixed. Then, the frame body 12 which is formed in such a manner is attached so as to be erected along four edges of the bottom plate, and a required foldable box is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding box used for packaging foods, and more particularly to a folding box in which a frame is erected on a bottom plate to form a peripheral wall.

[0002]

2. Description of the Related Art Folding boxes used for packaging foods such as sushi, rice balls, bento, and sweets are made of various materials such as paper, wood (wood) and foam plastic. The structure is such that a frame body is provided upright on the peripheral portion of the bottom plate to form a peripheral wall, and the frame body is molded as follows. That is, one example of the conventional folding box is shown in FIGS.
6, the folding box 1 has a peripheral wall 3 provided upright on the peripheral edge of the bottom plate 2, and the peripheral wall 3 is connected and fixed by a stitcher 7 at both ends of a strip-shaped body 5 having a groove 4 for bending inside. It is molded by the frame body 8 formed by. The length of one side of the strip 5 is determined according to the outer shape of the peripheral portion of the bottom plate 2,
A bending groove 4 is provided inside each bent portion, and a joining piece 9 for connection is continuously provided at one end portion. The frame body 8 is formed by superposing the other end portion on the joining piece 9 and fixing it.

The both ends of the strip 5 are connected by the joining piece 9
In addition to stacking and fixing with the stitcher 7, there is also a method of adhering and fixing with glue or adhesive. Further, when the frame body 8 is formed of foamed plastic, in addition to the case of forming the frame body by stacking the joining sides 9 as described above, as shown in FIG. A method of forming the frame body 8 by butt welding 10 is adopted.

[0004]

However, the molding method of the frame 8 has the following problems. That is,
In the method of stacking the joining pieces 9, not only the finished appearance of the product is bad, but also wasteful materials are used. Further, when the inner container is mounted, there is a problem that the inner surface cannot be closely fitted due to the unevenness of the inner surface and it is difficult to automate the frame molding.
Further, in the case of connecting and fixing with a stitcher, there is a problem that the stitcher must be removed at the time of recycling, which is time-consuming and costly.
Further, if the stitcher is loosely tightened and the tip of the stitcher rises, there is a risk of unexpected injury when packing food or processing it after use.

Also, like a foamed plastic frame,
In the method of welding both ends by butt welding, unevenness due to steps does not occur on the inner and outer surfaces of the peripheral wall, but not only the welding is troublesome, but also it is difficult to form an accurate shape. Further, since beads are generated on the inner and outer surfaces during welding, a finishing process for removing the beads is required. Since such a processing step is required, it has been a factor in increasing the cost of the product.

The present invention has been made in view of the above circumstances, and provides a folding box that is easy to recycle, can be used safely, has excellent strength, and has a good external appearance. is there.

[0007]

The present invention has the following configuration to achieve the above object. That is, the folding box according to claim 1 is a folding box in which a frame is erected on a bottom plate to form a peripheral wall, and a plurality of bending grooves are provided in a band-shaped body in which the frame has a predetermined width and length. It is characterized in that the strip-shaped body is formed by providing stepped portions on opposite ends of the strip-shaped body, which are opposite to each other, and overlapping the stepped portions. Further, the folding box according to a second aspect is characterized in that both ends of the belt-like body are connected and fixed by adhering the step portions to each other with an adhesive or an adhesive. Further, the folding box according to a third aspect is characterized in that the stepped portions are overlapped with each other, and the adhesive tape is attached so as to be wound from the inner surface to the outer surface so as to be connected and fixed.

In the folding box according to claim 4, a plurality of folding members are formed into a strip-shaped body made of cardboard, which has stepped portions at both ends when the cardboard is manufactured by shifting the ends of the paperboard and adhering them together. It is characterized in that a frame is formed by providing a groove and stacking the step portions. Also,
In the folding box according to claim 5, a plurality of bending grooves are provided in a band-shaped body made of cardboard with a stepped portion formed by scraping off the end portion, and the stepped portion is overlapped to form a frame body. Is characterized by. According to a sixth aspect of the present invention, in a folding box, a plurality of bending grooves are provided in a band-shaped body made of cardboard in which a flute is crushed by pressing an end portion of the cardboard to form a step portion, and the step portions are overlapped with each other. It is characterized in that the frame is molded by combining them.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The present invention is characterized in that step portions are formed at both end portions of a band-shaped body that constitutes a frame body, and the step portions are abutted and adhered to each other. That is, as shown in FIGS. 1 and 2, the strip-shaped body 13 constituting the frame body 12 attached to the peripheral portion of the bottom plate of the folding box is provided with the folding groove 14 inside each folding portion, and Step 15 at the end
And a step 16 is provided at the other end. The step portion 15 is provided on the outer surface side when the frame body 12 is bent to form the frame body 12, while the step portion 16 is provided on the inner surface side. Therefore, in order to form the frame body 12, the stepped portion 1
5 and 16 can be connected and fixed by abutting and adhering, and the inner and outer surfaces of the connecting portion can be made smooth.

Therefore, the height (size) of the step portions 15 and 16 is approximately one half of the plate thickness, and the plate thickness is formed when the two are combined. Further, the length of the step portions 15 and 16 may be appropriately determined depending on the material of the band-shaped body, the wall thickness, the size of the folding box, etc. so as to have sufficient bonding strength. Further, the pasting may be performed with glue or an adhesive as in the conventional case, but the both ends may be integrally fixed by wrapping the adhesive tape so as to be wound from the inner surface to the outer surface. In the present invention, since the step portions are abutted and adhered to each other, they can be formed in a shape with accurate dimensional accuracy by shifting them in the horizontal direction and adjusting. In addition, the sticking surface can be increased, and since the sticking is performed on a surface parallel to the inner and outer surfaces, sufficient bending strength can be maintained.

Although the plane quadrangular frame 12 has been described with reference to FIGS. 1 and 2, it is not limited to the quadrangular frame.
It is needless to say that the present invention can be similarly applied to a frame body such as a pentagon, a hexagon, and an octagon. Further, as in the above-described embodiment, the invention is not limited to the case where the bending groove 14 is engraved to form the corners at right angles. That is, as shown in FIG. 3, it is naturally applicable to a so-called rounded frame body 18, which is formed by being curved by four to five cuts 17 provided inside the corner portion. The parts 15 and 16 may be used.

Next, a method of forming the step portions 15 and 16 will be described. First, one method is a method in which, at the time of manufacturing thick paper, the edges of the paper are shifted in advance by a certain size and then bonded. As shown in FIGS. 4 and 5, the upper paper 19 and the lower paper 20 having the same size are attached to each other by displacing the both ends by a predetermined size, and the thick paper 21 having step portions 15 and 16 at both ends. To do. In order to form these into the frame body 12, a bending groove 14 is engraved on one surface, cut from the cut line 22 to form the band-shaped body 13, and then bent from the bending groove 14 to form step portions 15 at both ends. , 16 may be butted and attached.

The thick paper 21 can be manufactured by a laminating machine 26 as shown in FIG. That is, the belt conveyor 2 provided with the claws 27 at appropriate intervals for locking and transporting the upper paper 19 supplied one by one by the supply device.
8 and a belt conveyor 31 in which tabs 30 are provided at appropriate intervals for locking and transferring the lower papers 20 which are also supplied one by one by the supply device, are vertically arranged. A gluing roller 32 for gluing the lower paper is arranged above 31. The lower paper 20 transferred by the claws 30 has its upper surface coated with glue by the gluing roller 32, and is superposed on the upper paper 19 transferred by the belt conveyor 28. At this time, the positions of the tabs 27 and 30 of the belt conveyor 28 and the belt conveyor 31 are adjusted so that the front end portions of the upper paper 19 and the lower paper 20 are shifted by a predetermined width and overlap each other.

The upper paper 19 and the lower paper 20 which are overlapped are
The pressure-sensitive adhesive rollers 33 and 34 integrally bond the sheets, and the conveyer 37 conveys the sheets to the press rolls 38 and 39. By pressing with the press rolls 38 and 39, the completely bonded cardboard 21 is manufactured. The thick paper 21 is conveyed to the next step by the next conveyer 40. Originally, the above-mentioned bonding machine 26 was designed to bond the upper paper 19 and the lower paper 20 with their front end portions completely aligned with each other, and it was not considered that the front end portions of the upper paper 19 and the lower paper 20 were intentionally shifted. In the present invention, in order to form the step portions at both ends of the strip, the step portions are provided at the ends at the stage of manufacturing the thick paper rather than cutting the thickness of the thick paper.

Another method of forming the step portions 15 and 16 is a method of scraping both ends of a cardboard 21a formed by laminating a plurality of sheets into a predetermined width. Cardboard 21 shown in FIG.
Reference character a is a cardboard of three-sheet interleaving paper in which white plates 44 are attached to the upper and lower surfaces of the chip 43, and is often used as a material for the frame body. Both ends of such a cardboard 21a are scraped off by a predetermined width to form steps 15a and 16a. Cardboard 2 so that the steps 15a, 16a are on opposite sides of each other
It is provided at both ends of 1a. To scrape off both ends, as shown in FIG. 8, the grinder 46 may be pressed against the ends while the cardboard 21a is transported horizontally. In the case of this method, the grinders 46 can be pressed against the upper and lower surfaces respectively at both ends of the thick paper 21a and scraped off at the same time. Good.

Even in the case of the thick paper 21a of the above three-sheet interleaving paper, after the two sheets are pasted with their ends aligned as usual,
You may form a step part by shifting and sticking another one sheet. In addition, even in the case of a two-sheet interleaf paper, the end portion may be shaved to form the stepped portion. Of course, in any thick paper, a cut is made along the side end face, and the edge is cut from the cut to a predetermined edge. You may form a step part by peeling off only thickness.

FIG. 9 and FIG. 10 show a method of forming a belt-shaped body when a cardboard is used. That is, the pressure rollers 50 are pressed against the ends of the cardboard 49 to crush the flutes 51 to form the steps 15b and 16b. Bending grooves 54 may be provided at predetermined positions in the band-shaped body 13a forming the frame body. The bending groove 54
Can be formed by pressing a groove width roller at a predetermined position to crush the flute. When the band-shaped body is formed from cardboard in this manner, it is preferable to seal the flute by sticking paper on the end surface where the flute is open.

11 to 13 show an embodiment of a folding box in which the bottom plate is also made of cardboard. A step portion 58 is provided on the four edges of the bottom plate 57, and a step portion 60 is also provided on the inner surface of the upper end of the frame 59. Thus, by crushing the edge to form the step, the flute exposed on the outer surface is closed and the strength is improved. Further, in the frame 59, the lid can be easily fitted into the step portion 60.
The step portion 58 of the bottom plate 57 can be formed by the pressing roller 50 as shown in FIG. 9, but the frame body 59 can be formed as follows. First, the step portion 60 is formed along the longitudinal edge of the strip 13a shown in FIG.

Then, as shown in FIG. 12, a step portion 16b is formed by pressing the same surface as the step portion 60 at one end.
As shown in FIG. 13, the other end presses the side surface opposite to the step portion 60 to form the step portion 15b.
5b is cut off only at the height of the step portion 60 to form a notch 63. When both ends of the band-shaped body 13a having the above structure are overlapped with each other, the step 15b and the step 16b overlap each other, and the step 60 is continuous. In the cutout 63, it is preferable that the flute opening be covered with paper to be hermetically sealed.

In the above embodiment, the frame using cardboard and cardboard has been described, but the frame is not necessarily limited to paper, and may be molded from foamed plastic or warp wood. In the case of foamed plastic, the step portion can be formed at the same time during the injection molding, and in the case of warp wood, the step portion may be cut to form the step portion.

[0021]

Since the present invention is configured as described above, the following specific effects can be obtained. In other words, in the folding box according to the first aspect, since the bonding surface is parallel to the side surface and the bonding surface can be increased, the bonding strength is increased and peeling does not occur easily. In addition, since the inner and outer surfaces are smooth, the appearance is good. Also,
The material cost can be reduced, and unlike the conventional method, a stitcher is not required, so that it can be used safely. Further, since there is no need for separation, recycling is easy and cost reduction at the time of recycling can be achieved.

In the folding box according to the second aspect, not only the manufacturing of the frame body but also the manufacturing of the entire product can be automated. The folding box according to claim 3 is suitable for a small amount of special products. Further, in the folding box according to the fourth aspect, since the step portion is formed at the same time when the cardboard is manufactured, the folding box can be manufactured by the same process as the conventional process. In addition, claim 5
In the folding box according to the present invention, the thickness of the step can be easily adjusted. Moreover, in the folding box according to the sixth aspect, it is possible to obtain a lightweight and rigid product.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view showing a state before attaching both end portions of a rectangular frame belt-shaped body.

FIG. 2 is a perspective view of a band-shaped body.

FIG. 3 is an explanatory plan view showing a state before the both ends of the rounded frame body band-shaped body are attached.

FIG. 4 is an explanatory perspective view of a cardboard in which both ends are offset and bonded to each other to form a step.

FIG. 5 is a partially enlarged cross-sectional view of a cardboard, which is a two-sheet interleaving paper in which a step is also formed.

FIG. 6 is a partially enlarged cross-sectional view of cardboard, which is a three-sheet interleaving paper in which a step portion is also formed.

FIG. 7 is a schematic side view illustrating a method of forming a step portion when laminating with a laminating machine.

FIG. 8 is an explanatory diagram of a method of forming a step by scraping.

FIG. 9 is an explanatory diagram of a method of forming a step on a cardboard.

FIG. 10 is a perspective view of a belt-shaped body made of cardboard.

FIG. 11 is an exploded perspective view showing an example of a folding box using cardboard.

FIG. 12 is a process drawing showing the method of forming the end portion of the cardboard strip.

FIG. 13 is a process drawing showing the method of forming the end portion of the cardboard strip.

FIG. 14 is a perspective view showing a conventional folding box.

FIG. 15 is an exploded perspective view of the same conventional folding box.

FIG. 16 is a plan view showing a conventional method for forming a frame body by butt welding.

[Explanation of symbols]

 12 frame 13 band 13a band 14 folding groove 15 step 15a step 15b step 16 step 16a step 16b step 17 notch 18 frame 19 top paper 20 bottom paper 21 thick paper 21 cutting paper 22 cutting line 26 Laminating Machine 27 Claw 28 Belt Conveyor 30 Claw 31 Belt Conveyor 32 Gluing Roller 33 Crimping Roller 34 Crimping Roller 37 Transfer Conveyor 38 Press Roller 39 Press Roller 40 Transfer Conveyor 43 Chip 44 White Board 46 Grinder 49 Cardboard 50 Pressing Roller 54 Bending Groove 57 Bottom plate 58 Step 59 Frame 60 Step 63 Notch

Claims (6)

[Claims] 1. In a folding box in which a frame is erected on a bottom plate to form a peripheral wall, a plurality of bending grooves are provided in a band-shaped body formed by forming the frame with a predetermined width and length, and A folding box, characterized in that step portions which are opposite to each other are provided at both ends, and the step portions are overlapped with each other. 2. The folding box according to claim 1, wherein both ends of the belt-like body are connected and fixed by adhering the stepped portions to each other with an adhesive or an adhesive. 3. The folding box according to claim 1, wherein the stepped portions are overlapped with each other, and the adhesive tape is attached so as to be wound from the inner surface to the outer surface so as to be connected and fixed. 4. A plurality of folding grooves are provided in a band-shaped body made of cardboard having stepped portions formed at both ends by shifting and adhering the ends of the paperboard when manufacturing the cardboard. The folding box according to any one of claims 1 to 3, wherein the frame is formed by stacking the two. 5. A frame body is formed by providing a plurality of bending grooves on a belt-like body made of cardboard having a stepped portion formed by scraping off the end portion, and superposing the stepped portions on each other. The folding box according to any one of claims 1 to 3. 6. A frame body, wherein a plurality of bending grooves are provided in a belt-like body made of cardboard in which a flute is crushed by pressing an end portion of a cardboard to form a step portion, and the step portions are overlapped with each other. The folding box according to claim 1, wherein the folding box is molded.