JP4845162B2 - Folding box formation - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a folding box forming body made of a thermoplastic resin foam plate used as a returnable box, a storage box or the like, and a folding box made of this box forming body. More specifically, the folding-type box forming body made of a thermoplastic resin foam plate has a folding-type box forming body with improved durability and hinge resistance and excellent load resistance. Regarding the box.
[0002]
[Prior art]
Conventionally, a folding box forming body made of a thermoplastic resin foam plate and a folding box made of the box forming body are, for example, a folding box forming body made of a polypropylene resin foam board and a folding box made of the box forming body, so-called heat. Cardboard-like boxes made of plastic resin foam plates are known and have been used as returnable boxes, storage boxes, and the like. When assembling this foldable box forming body into a box body, one end of the portion forming the side wall portion of the folding box forming body along the groove formed as the fold forming portion forming the side wall portion of the box forming body and the other A side wall is formed by fixing the end, folded along a groove formed as a fold between the flap formed on the side wall forming part and the side wall, and extended to each side wall. The bottom part or the cover part is formed by superimposing the above-mentioned flaps, and is assembled into, for example, a box having a code number 0201 defined in JIS Z 1507.
[0003]
[Problems to be solved by the invention]
The box as described above is used as a returnable box, a storage box, or the like. For example, it is used as a returnable box for conveying and distributing various articles between a user and a producer, or used as a storage box. For example, when it is used repeatedly as a return box between the user and the producer, when it is transported between the user and the producer to the user or the producer after use, the flap part is unfolded and folded and conveyed again. Used assembled in a box. In addition, when used as a storage box, or when used for transportation or distribution, it is used by stacking boxes containing contents.
Folding boxes made of foamed plates used in this way are subject to cracks and tears at the end of the folding groove during repeated assembly, deployment, use, and transport. There was a problem in the durability, hinge resistance, and load resistance of the groove that forms the folded portion where the groove portion tears and the box body may be damaged.
[0004]
In view of the above circumstances, the present invention is a folding box forming body made of a foam plate, which improves the durability and hinge resistance of the groove forming the folding portion and is excellent in load resistance. And the box which consists of this box formation body is provided.
[0005]
[Means for Solving the Problems]
That is, the present invention is (1) Folding-type box formation comprising a polypropylene-based resin foam plate provided with a plurality of flaps which are formed to extend on the side wall forming portion of the box and overlap to form the bottom portion or the lid portion. In the body, a folding groove formed between the side wall forming portions adjacent to each other, a folding groove formed between the flap extending in the side wall forming portion and the side wall forming portion, and these A compression portion formed at each end of the folding groove so as to cross the folding groove, and the folding groove is formed between adjacent side wall forming portions of the box. The folding groove and the folding groove formed between the side wall forming portion and the flap extending in the side wall forming portion are brought into a state of being abutted with each other at the corner portion forming portion of the box body. Formed and the compression part is abutted A folding-type box-forming body characterized in that it is continuously formed so as to straddle each end of the folding groove formed so as to be in a state, and (2) a side wall-forming portion and a flap And the folding groove formed between the side wall forming part adjacent to the side wall forming part and the flap are provided with their center lines shifted from each other. (1) or (2) characterized in that the folding type box forming body according to (1) above, and (3) the folding groove is composed of a plurality of adjacent grooves. ) folding type box forming member according, also (4) folding ridge grooves and compression unit, without substantially melting the polypropylene-based resin foam sheet, the polypropylene resin by pressing the foamed polypropylene resin sheet Formed on the surface of the foam plate Above, wherein the a shall (1), (2) or (3) a folding type box forming member according, and (5) Polypropylene resin foamed plate, a polypropylene resin 70 to 99 wt% And a folding-type box according to (1), (2), (3) or (4), which is obtained by foaming a polypropylene resin composition comprising 30 to 1% by weight of an elastomer (1), (2), (3), (4) or (4), wherein the formed body and (6) the polypropylene resin foam plate have a polypropylene resin film laminated on at least one surface. (5) Folding box formation according to (6), (7) The polypropylene resin film is made of a polypropylene resin composition containing an elastomer. The present invention further relates to (8) a box made of the folding box forming body according to any one of (1) to (7).
[0006]
DETAILED DESCRIPTION OF THE INVENTION
As described above, in the folding box forming body made of foamed plate and the box body made of the box forming body, when the assembly and deployment of the box are repeated, the folding groove portion, particularly the end of the folding groove Cracks and tears are likely to occur, and there is a risk that the cracks and tears cause breakage from the folding groove portion of the box during handling. The present invention suppresses the occurrence of cracks and tears by forming a compression portion at each end of the folding groove, and provides durability and resistance to each end of the folding groove, particularly the folding groove. The hinge property is imparted and the load resistance of the folding groove and the box itself is improved.
[0007]
The folding box forming body of the present invention is manufactured by pressing a cutting blade against a thermoplastic resin foam plate, for example, a polypropylene resin foam plate, and punching it into a box shape body of a predetermined shape. A folding groove forming jig and a compression portion forming jig at the end of the folding groove are attached to a press machine equipped with a cutting blade, and simultaneously forming the folding groove and the compression portion at the same time as the punching process. be able to.
[0008]
When forming the above-mentioned groove for folding, rubber elastic bodies are arranged in close contact with the jig (pushing blade) on both sides of the folding groove forming jig (pushing blade). The pulling of the surrounding foam board accompanying formation is suppressed, and the groove | channel which the finish is favorable is formed. If the fold groove is composed of a plurality of ridges, the rubber elastic bodies can be arranged in close contact with the jig (pushing blade) on both outer sides of the outermost fold groove forming jig. There is no problem even if a rubber elastic body is not disposed between the tools (pushing blades).
In addition, for example, when the folding groove is composed of three grooves, the middle groove is preferably deepest. By forming in such a manner, it is possible to fold straight with the middle groove as the center, and it is easy to bend with good finish. The depth of the groove for folding is determined by the relationship with the thickness of the foam plate used, but in general, the deeper the depth, the easier the folding, but the lower the tear strength of the groove for folding. When the remaining thickness of the folding groove is less than 0.7 mm, the tear strength of the folding groove is greatly reduced. Therefore, it is necessary to take care that the depth of the folding groove is formed in consideration of the thickness of the foamed plate as long as the remaining thickness does not fall below 0.7 mm.
[0009]
In the folding box forming body of the present invention, the folding groove is formed between the folding groove forming the side wall forming part of the box, the flap extending on the side wall forming part, and the side wall forming part. Folding grooves are provided, and the compression portions formed at the end portions of these folding grooves are formed at right angles to the grooves so as to cross the folding grooves. And it is preferable that this compression part is formed in the continuous state. For example, as shown in FIG. 3, the compressed portion is formed in a continuous state, as shown in FIG. 3, a folding groove 6 that forms adjacent side walls of the box, and a flap that extends to the adjacent side wall portions. The folding grooves 5 and 7 of the part are in a state of being abutted from three directions at the corner forming portion of the box, but the compression part 8 is continuous so as to straddle the folding grooves from these three directions. It means that it is formed.
[0010]
As described above, the compression portion formed in the folding groove and the folding groove end of the present invention is usually formed simultaneously with the punching process without substantially forming the foamed plate. Is formed on the surface layer portion of the foam plate. The compression part formed at the end of the folding groove is formed in the surface part of the foam plate in a state where the bubbles on the surface part of the foam plate are crushed, and suppresses the occurrence of cracks and tears in the folding groove At the same time, the compression part can be easily bent. The compression part in the present invention usually needs to have a width of at least 1 mm. When the width of the compression portion is narrower than 1 mm, it is insufficient to achieve the effect of suppressing or preventing the occurrence of cracks and tears in the intended groove. On the other hand, when the width of the compression part is too wide, the bending property may be deteriorated or the load resistance may be deteriorated when the box is formed. Therefore, the width is usually 15 mm or less, preferably 2 mm to 10 mm. It is about the width.
[0011]
Moreover, although the above-mentioned groove for folding in the present invention may be a single groove, it depends on the size of the box, the thickness of the foam plate used, etc. It is preferable to be composed of 2 to 5 strips because it is easy to fold and distortion is unlikely to occur in the bent portion, so that the durability of the grooves and the hinge resistance can be improved.
[0012]
Next, the folding type box forming body of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of an embodiment of a folding box forming body of the present invention, in which long side wall forming portions 1 and 3 and short side wall forming portions 2 and 4 of the box are alternately 1, 2, 3 and 4 are provided side by side, and flaps 11, 12, 21, 22, 31, 32, 41, 42 are respectively extended in the side wall forming portions. Folding grooves 6 that form the side wall portions of the box, and folding grooves 5 and 7 formed between the flaps extending on the side wall forming portions and the side wall forming portions, are provided. A compression portion 8 is formed at each end of the groove for use at right angles to the groove across the folding groove. At one end of the side wall forming portion (side wall forming portion 1 in FIG. 1), a fixing flap 9 for fixing to the other end of the side wall forming portion (side wall forming portion 4 in FIG. 1) is provided.
In order to assemble the box from the box forming body of FIG. 1, the side wall forming folding groove 6 is bent, and the fixing flap 9 provided in the long side wall forming section 1 is connected to the short side wall forming section at the other end. 4 and flaps 11, 12, 22, 22, 31, 32, 41, 42 that form a bottom part or a lid part of the box body, for example, with staples or adhesive tapes, are respectively formed in the folding grooves 5, 7. A folded box is formed so that each groove is on the outside or inside of the box.
[0013]
FIG. 2 shows a folding former according to another embodiment of the present invention. In FIG. 2, flaps 101 and 102 that form a bottom portion or a lid portion are extended on a long side wall forming portion 1 of the box. In this embodiment, the bottom or lid is configured to cover the entire surface with a single flap, and the flap 101 that forms the lid or bottom is formed on the short side wall forming portions 2 and 4 of the box. , 102 and flaps 14 and 15 are provided. The flaps 101 and 102 forming the bottom part or the cover part are provided with fixing flaps 13 for fixing to the side wall forming part 3. Further, the long side wall forming portion 1 is provided with a fixing flap 10 for fixing to the short side wall forming portion 4 to form a box. To assemble the box from the folding box forming body shown in FIG. 2, the folding groove 6 shown in FIG. 2 is bent, and the fixing flap 10 is formed by the end of the short side wall forming portion 4 and staples. Bonded and fixed, the flap 102 is bent along the folding groove 5, the flap 13 is coupled and fixed to the side wall forming part 3, and the flaps 15 provided on the side wall forming parts 2 and 4 are respectively set along the folding groove 71. Then, the side of the flap 102 forming the bottom part or the lid part is joined and fixed with an adhesive tape or the like, then the flap 14 is bent along the groove 71, and the flap 101 and the flap 13 forming the lid part are grooved. 5 and 51 are bent to form a box.
In the case of the embodiment shown in FIG. 1 as well, the flap forming the bottom or lid of the box can be configured to cover the entire surface with a single flap as shown in FIG. In this case, for example, the flap forming the bottom portion is extended to the side wall forming portion 1 so that the entire bottom portion is formed by one flap instead of the flap 12 of FIG. Instead of the flap 31 in FIG. 1, a flap that forms the entire lid portion with a single flap can be extended to the side wall forming portion 3. 1 is an example of what is indicated by various code numbers defined in JIS Z 1507, but the box forming body of the present invention is shown in FIG. 1 and FIG. In addition to the above, it can also be a development view indicated by various code numbers defined in JIS Z 1507.
[0014]
FIG. 3 is an enlarged view of portion A in FIG. 1 and shows a state of the compression portion formed at the end of the folding groove of the present invention. FIG. 3 shows the folding groove 6 that forms the adjacent side wall forming portions 2 and 3 of the box, and the folding grooves 5 and 7 of the flap forming portions 21 and 31 that extend from the adjacent side wall forming portions. However, the corner portion forming portion of the box body is in a state of being abutted from three directions, and the compression portion 8 is continuously formed so as to straddle the folding grooves 5, 6, and 7 from these three directions. ing. The center lines of the folding grooves 7 and 5 are shifted from each other. For example, when the number of the folding grooves is 3, as shown in FIG. 3, the center line of the folding grooves 5 is changed to the folding line. When the box is formed, it is possible to escape when the box is formed by providing it in accordance with the position of the groove on the lower side of the groove 7 so that the corner of the box is finished cleanly.
[0015]
The thermoplastic resin foam plate used in the present invention is a polypropylene resin foam plate and desirably has a flexural modulus of 200 MPa or more measured according to JIS K 7203 (1989). Such a foamed plate can be easily obtained by appropriately selecting the apparent density, thickness, and closed cell ratio. In general, the bending elastic modulus tends to show a larger value as the numerical value increases. Moreover, since a bending elastic modulus can be easily raised by laminating | stacking a polypropylene resin film layer on the at least one surface of a polypropylene resin foam board, lamination | stacking of a polypropylene resin film layer is a preferable aspect.
[0016]
Examples of the polypropylene resin constituting the polypropylene resin foamed plate include a propylene homopolymer and a propylene copolymer. Examples of the propylene copolymer include copolymers with other olefins copolymerizable with propylene. Examples of such olefins include ethylene, 1-butene, isobutylene, 1-pentene, and 3-methyl-1- Examples thereof include α-olefins having 2 to 10 carbon atoms such as butene, 1-hexene, 3,4-dimethyl-1-butene, and 3-methyl-1-hexene. Further, these copolymers may be random copolymers or block copolymers, and may be not only binary copolymers but also ternary copolymers. These polymers can be used alone or as a mixture of two or more. In addition, mixing an elastomer in a polypropylene resin is effective in improving brittleness.
[0017]
Examples of the elastomer used by mixing with a polypropylene resin include styrene-butadiene-styrene block copolymer rubber, styrene-isoprene-styrene block copolymer rubber, hydrogenated styrene-butadiene-styrene block copolymer rubber, styrene- Styrene elastomers such as ethylene-propylene copolymer rubber, styrene-ethylene-propylene-styrene copolymer rubber, ethylene-propylene random copolymer rubber, ethylene-butylene block copolymer rubber, ethylene such as ethylene-octene random copolymer rubber and others Olefin-based elastomers such as copolymer rubbers with other olefins. Of these elastomers, olefin-based elastomers are preferred from the viewpoint of folding resistance and low temperature impact resistance. Among these olefin elastomers, copolymer rubbers of ethylene and other olefins are preferred from the viewpoint of dispersibility with polypropylene resins. Especially, ethylene-butylene block copolymer rubbers exhibit a sufficient effect even if the blending amount is small. In addition, a foamed plate having excellent folding resistance and low temperature impact resistance can be obtained while maintaining rigidity such as bending elastic modulus, which is preferable.
[0018]
The polypropylene resin composition constituting the polypropylene resin foam plate containing the elastomer used in the present invention is a composition containing 1 to 30% by weight of the elastomer and 99 to 70% by weight of the polypropylene resin. Is preferred.
Moreover, another thermoplastic resin can be mixed with the polypropylene resin composition of this invention as needed. In this case, as the other thermoplastic resin, one used when producing a polypropylene resin foam is used, and it is preferable that the amount be at most 30 parts by weight with respect to 100 parts by weight of the polypropylene resin composition. .
[0019]
In the above-mentioned polypropylene-based resin composition, there are usually inorganic powders such as talc and silica, a reaction mixture of a polyvalent carboxylic acid such as monosodium citrate and sodium carbonate, sodium bicarbonate, or a polyvalent carboxylic acid as a foam regulator. An acidic salt of In addition, inorganic fillers, antioxidants, lubricants, ultraviolet inhibitors, flame retardants, antistatic agents, antibacterial agents, and the like can be added as desired.
[0020]
The foam board used for this invention can be manufactured by a conventionally well-known method. As the foaming agent used in this case, known foaming agents used per se, such as inorganic foaming agents, volatile foaming agents, and decomposable foaming agents, are used. The apparent density of the foamed plate in the present invention is generally 0.07 to 0.60 g / cm ³ , preferably 0.09 to 0.45 g / cm ³ , and the thickness is 1 to 10 mm, preferably 2 to 8 mm. Used.
[0021]
The foamed plate used in the present invention is preferably laminated with a thermoplastic resin film made of a polyprolene resin on at least one surface, preferably on both surfaces. This thermoplastic resin film is preferably a polypropylene resin film made of a composition containing 99 to 70% by weight of a polypropylene resin and 1 to 30% by weight of an elastomer. Examples of the elastomer include styrene-butadiene-styrene block copolymer rubber, styrene-isoprene-styrene block copolymer rubber, hydrogenated styrene-butadiene-styrene block copolymer rubber, styrene-ethylene-propylene copolymer rubber, and styrene-ethylene. -Styrene elastomers such as propylene-styrene copolymer rubber, ethylene-propylene random copolymer rubber, ethylene-butylene block copolymer rubber, ethylene-octene random copolymer rubber, and other olefins such as copolymer rubbers of ethylene and other olefins. Based elastomers. Of these elastomers, olefin-based elastomers are preferred from the viewpoint of folding resistance and low temperature impact resistance. Such a thermoplastic resin film preferably has a thickness of 30 to 500 μm.
In the present invention, the foamed plate on which such a thermoplastic resin film is laminated can be easily produced by, for example, a multilayer coextrusion method.
[0022]
【The invention's effect】
The folding box forming body of the present invention is assembled and used as a returnable box or a storage box. In the folding box forming body of the present invention, a compression portion is formed at each end of the folding groove. This prevents cracks and tears in the folding groove even when the box is repeatedly assembled and deployed, and is durable and hinge-resistant at each end of the folding groove, especially the folding groove. Thus, the load resistance of the folding groove and the box itself is improved, and there is no possibility of causing damage to the box due to cracks in the folding groove and the like.
In addition, the folding box formed body of the present invention is excellent in folding resistance and low-temperature impact resistance by using a foamed plate obtained from a polypropylene resin composition containing an elastomer, and has an excellent flexural modulus. Thus, a box having excellent rigidity can be obtained.
[Brief description of the drawings]
FIG. 1 is a development view showing an example of an embodiment of a folding box forming body of the present invention.
FIG. 2 is a development view showing an example of another embodiment of the folding box forming body of the present invention.
FIG. 3 is a partial enlarged view of a portion indicated by A in FIG.
[Explanation of symbols]
1, 2, 3, 4 .. Side wall forming part 5 of box, 7 .. Flap folding groove 6 .. Box side wall forming folding groove 8 .. Compression part 9, 10. Flap 11, 12, 21, 22, 31, 32, 41, 42, 101, 102 .. lid or bottom forming flap 13, 14, 15 .. lid or bottom forming part fixing flap 51, 71. Flap folding groove for fixing lid or bottom forming part

Claims (8)

In a foldable box forming body made of a polypropylene resin foam plate provided with a plurality of flaps which are formed to extend to the side wall forming portion of the box body and form a bottom portion or a lid portion,
A folding groove formed between the side wall forming portions adjacent to each other, and a folding groove formed between the flap extending on the side wall forming portion and the side wall forming portion;
A compression portion formed at each end of the folding groove so as to cross the folding groove;
The folding groove is formed by a folding groove formed between adjacent side wall forming portions of the box, and a side wall forming portion and a flap extending on the side wall forming portion. It is formed so that the groove is in a state of being abutted with each other in the corner forming part of the box,
The foldable box forming body is characterized in that the compression portion is continuously formed so as to straddle each end portion of the folding groove formed so as to be brought into abutted state.   The folding groove formed between the side wall forming part and the flap and the folding groove formed between the side wall forming part adjacent to the side wall forming part and the flap are shifted from each other in the center line. The folding box forming body according to claim 1, wherein the folding box forming body is provided.   The folding box forming body according to claim 1 or 2, wherein the folding groove is composed of a plurality of adjacent grooves. Groove and compression unit for folding is without substantially melting the polypropylene-based resin foam sheet is made formed in the surface portion of the foamed polypropylene resin sheet by pressing the foamed polypropylene resin sheet The folding box forming body according to claim 1, 2, or 3.   The polypropylene resin foam plate is obtained by foaming a polypropylene resin composition comprising 70 to 99% by weight of a polypropylene resin and 30 to 1% by weight of an elastomer. The folding type box formation body of 3 or 4.   6. The folding type box forming body according to claim 1, wherein a polypropylene resin film is laminated on at least one surface of the polypropylene resin foam plate.   The foldable box forming body according to claim 6, wherein the polypropylene resin film is made of a polypropylene resin composition containing an elastomer.   The box which consists of a folding type box formation body in any one of the said Claims 1-7.

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