WO2006075435A1

WO2006075435A1 - Paperboard three-dimensionally molded pallet

Info

Publication number: WO2006075435A1
Application number: PCT/JP2005/020342
Authority: WO
Inventors: Satoru Ishibashi
Original assignee: Ishibashi Co., Ltd.
Priority date: 2005-01-13
Filing date: 2005-11-07
Publication date: 2006-07-20
Also published as: CN101094792A; US20080210138A1; JP2006193179A

Abstract

A paperboard three-dimensionally molded pallet having commercially sufficient rigidity of its load carrying surface and load capacity strength of its leg parts. The pallet is so designed that when it is finally treated as a waste, it can be recycled as new paperboard three-dimensionally molded pallets or a material for the other paper products requiring rigidity. The pallet comprises a paper-made plate-like top board member (1) and paper-made bottomed roughly cylindrical legs (2). A plurality of through holes (15) are formed in the top board member (1), and the bottomed roughly cylindrical legs (2) are joined to the top board member (1) with a water-soluble adhesive agent in the state of the bottomed roughly cylindrical legs (2) partly inserted into the through holes (15). The top board member (1) and the bottomed roughly cylindrical legs (2) used are pressurized, heated, and dehydrated in a mold to form them in specified shapes by using a water-absorbed laminated flat plate synthetic paper as a material.

Description

Specification

Paperboard three-dimensional pallet technology

[0001] The present invention relates to a paperboard three-dimensional molding pallet used when carrying a load or the like with a forklift or the like. Specifically, the pallet is manufactured from a recyclable raw material and has excellent surface hardness and load bearing strength. The present invention relates to a durable paperboard three-dimensional molding pallet.

Background art

[0002] —Generally, wooden pallets have been used as a pallet for transporting luggage with forklifts. Recently, however, deforestation has become an international social problem. Reduction of usage is desired. In addition, wooden pallets are difficult to dispose of, and fumigation treatment is necessary to prevent insects, which is troublesome and expensive.

[0003] From such a viewpoint, in recent years, many cardboard pallets are used instead of wooden pallets. This cardboard pallet facilitates disposal and is preferable from the viewpoint that it can be recycled as paper. The strength of the load carrying surface with respect to the load of the load is weak and there is a limit to the load range that can be used (for example, (See Patent Document 1)

[0004] In addition, pallets are always provided with a forklift nail insertion space on the back of the deck board using legs and girders, but cardboard legs and girders are used for trucks that have low strength. In this case, the legs and girders are crushed due to impacts during transportation, and the pallet cannot be used because there is no space for the hooks. However, plastic or metal fasteners were used to strengthen the legs (for example, see Patent Document 2).

[0005] Further, as a method of using a waste paper so that a paper molded product having various bent surfaces has a sufficient strength, a waste paper solution obtained by vacuum dehydrating a colloidal waste paper solution in a mold is used. There is also a proposed method for producing Nort, which uses waste paper as the main material, in which legs are formed by a stack and the load-carrying surface is crimped onto it. leg The member is made of a material such as a so-called egg paper protective case, and cannot be said to have sufficient strength, and has no surface hardness that can withstand piercing by a forklift claw (for example, patent documents). (See 3).

Patent Document 1: JP-A-6_171648

Patent Document 2: Japanese Patent Laid-Open No. 2002-370740

Patent Document 3: Japanese Patent Laid-Open No. 7-285185

Disclosure of the invention

Problems to be solved by the invention

[0006] In order to avoid the above-mentioned deforestation problems, pallet material reuse problems, pest control problems, etc., paper pallets made of cardboard and waste paper are attracting attention. In addition, since the rigidity and strength of the legs are weak, there remains a problem that the range of use is practically limited.

[0007] Therefore, according to the present invention, a paperboard three-dimensional molding pallet having sufficient load carrying surface rigidity and leg load bearing strength practically sufficient as a pallet is provided, and finally disposed as a disposal disposal. In this case, the paperboard three-dimensional molding pallet is designed so that it can be recycled as a raw material for new paperboard three-dimensional molding pallets or other rigid paper products without the need to sort each material by material. It is an issue to provide. Means for solving the problem

[0008] In order to achieve a powerful problem, the invention according to claim 1 includes a paper-made flat top plate member and a paper-made bottomed cylindrical leg member, and the top plate member The leg member is joined to the top plate member with a water-soluble adhesive in a state in which a part of the leg member is inserted into the through hole. The top plate member and the leg member were subjected to pressure heating dehydration treatment in a mold in order to form the laminated plate interleaving paper that has absorbed water into a predetermined shape. It is characterized by high density compression molding.

[0009] In addition to the configuration described in claim 1, the invention described in claim 2 is formed such that the side plate of the top plate member has a rising side wall to be formed, and It is characterized in that reinforced corrugated cardboard is bonded to the inner flat part with a water-soluble adhesive. [0010] In addition to the configuration described in claim 1, the invention described in claim 3 includes, in the top plate member, a plate-shaped core member having a concavo-convex shape in cross section, a surface of the core member, and It is characterized in that Z or a plate-shaped outer member having a size covering the back surface is joined with a water-soluble adhesive.

[0011] In the invention of claim 4, in addition to the structure of claims 1 to 3, the leg member has a circular bottom surface and a cross section rising upward from the circular bottom surface in an arc shape. A bottomed substantially cylindrical shape having a wall surface and an outward flange portion extending horizontally from the wall surface, and joining the upper surface of the top plate member and the flange portion of the leg member. It is characterized by.

[0012] In addition to the configuration described in claim 4, the leg member includes a plurality of divided wall surfaces whose wall surfaces are divided into 3 to 8 along the circumferential direction. The side wall surfaces of the adjacent divided wall surfaces are leg members that are in contact with or close to each other.

[0013] In the invention according to claim 6, in addition to the configuration according to claim 5, the leg member is formed by superimposing a plurality of the leg members each having a substantially cylindrical shape with a bottom. The side end surfaces of the divided wall surfaces of the leg members are combined without overlapping each other on the circumference.

[0014] The invention according to claim 7 has the same thickness as that of the flange portion in which the flange portion is immersed around the through hole of the top plate member in addition to the configuration according to claims 1 to 6. It is characterized by a recess having a depth.

[0015] In the invention described in claim 8, in addition to the structure described in claims 1 to 7, a bottom plate having a size capable of connecting all the leg members to the bottom surface of the leg member is provided. It is characterized by being joined with a water-soluble adhesive.

The invention's effect

[0016] According to the paperboard three-dimensional molding pallet according to claim 1, since the pallet surface hardness is high, even if the top plate portion or the leg portion of the pallet is strongly struck by the forklift nail, the nail does not pierce the pallet. Efficient transportation work is possible. Further, the high density compression molded product itself has a high strength, and the leg member formed in a cylindrical shape penetrates the top plate member and is joined to the top. The plate member plays a role of filling the cylindrical leg member formed by three-dimensionally forming the paperboard to prevent the leg member from losing its shape due to the load, and the leg member is crushed by an impact during cargo transportation. As a result, there is no inconvenience that the pallet cannot be used because there is no space for the forklift claw, and a three-dimensional paperboard pallet for forklift claw is completed. And finally, when disposing, there is no need to separate the components according to the material. If the paperboard three-dimensional molding pallet is dissolved in water, a new paperboard three-dimensional molding pallet or other paper products that require rigidity Can be recycled as a raw material.

[0017] According to the paperboard three-dimensional molding pallet of claim 2, in addition to the effect of claim 1, the corrugated cardboard is joined to the top surface of the top plate with a water-soluble adhesive. The flange is bonded to the top plate member from the top and bottom, and is a single layer or multiple layers cut into a predetermined shape by a person handling heavy and light weight cargo with high strength of the legs while being independent legs. The cardboard is also made of paper by pasting it if necessary, and the recyclability of the pallet is not impaired. A three-dimensional paperboard pallet with the strength of the load carrying surface according to the weight of the load to be loaded It becomes possible to prepare on the spot. In addition, the cut surface of the cardboard is protected by the side wall where the top plate member with high surface hardness is raised, so even if the side of the top plate is struck by the forklift plate, the plate generated by the conventional cardboard pallet is used. The inconvenience of sticking does not occur, and efficient transportation work can be performed.

[0018] According to the paperboard three-dimensional molding pallet according to claim 3, in addition to the effect of claim 1, a core material made of a paper high-density compression molded product and a surface shell member are water-soluble on the top plate. Since the leg flange is bonded to the top plate member from above and below, the strength of the legs is high while the top plate member has structural rigidity. In addition, the strength of the load carrying surface can be improved, and the recyclability can be dealt with in the hope of heavier load bearing applications without any loss.

[0019] According to the paperboard three-dimensional molding pallet according to claim 4, in addition to the effect according to any one of claims 1 to 3, the leg member is formed with a circular bottom surface and an upper side from the circular bottom surface. ¾ Standing force ¾ Because it has a bottomed substantially cylindrical shape with a flange having a wall with a circular cross section and an outward flange extending horizontally from the wall, the shape rigidity of the leg is maximized , Make the most of the physical strength of the material obtained by pressurizing and dehydrating laminated flat paper It becomes possible to do.

[0020] Although it is theoretically easily conceivable that good shape rigidity can be obtained by using a cylindrical leg, a crack is formed in the interleaf by using laminated flat paper having little plasticity as a raw material. It is extremely difficult to obtain such a molded body with a bottomed substantially cylindrical shape with an integral flange, and the inventor of the present invention has already developed a method for forming a three-dimensional shape from flat laminated paper. A patent application was filed and disclosed in Japanese Patent Application Laid-Open No. 2000-177033. While the invention according to claim 4 basically employs this method, the length and number of notches corresponding to the thickness of the raw laminated flat paper are appropriately provided in the raw laminated flat paper so that A flat bottomed cylinder with a bent part on a curved surface that does not cause cracks in flat board interleaving paper. It can be molded into a cylindrical leg and has a load bearing strength that cannot be achieved with conventional paper products. Leg members were provided, and a solid paperboard three-dimensional molding pallet was provided.

[0021] According to the leg member of claim 5, in addition to the effect of claim 4, the wall surface of the substantially cylindrical leg with a bottom having a flange is divided into 3 to 8 along the circumferential direction. Since the side wall surfaces of the adjacent divided wall surfaces are in contact with or close to each other, the bottomed substantially cylindrical leg with the flange penetrates and is joined to the through hole of the top plate member. The structure is such that a tag is fitted in the barrel, and the divided wall surface forms a rigid body as a whole, and a leg member having high strength can be obtained.

[0022] According to the leg member according to claim 6, in addition to the effect of claim 5, the leg member overlaps a plurality of leg members each having a substantially cylindrical shape with a bottom, and the legs are overlapped. Since the side end surfaces of the divided wall surfaces of the member are combined and bonded without overlapping each other on the circumference, each divided portion is closed by the respective wall surface portions and reinforced, and each bottomed substantially cylindrical tube Although the legs have a split wall structure, the entire leg is unbroken and the strength is improved, and there is no gap communicating with the inside of the cylindrical legs, so it is possible to prevent moisture from entering the cylindrical legs and improve the durability of the legs. .

[0023] According to the paperboard three-dimensional pallet according to claim 7, in addition to the effect of any one of claims 1 to 6, the flange portion of the leg member is buried around the through hole of the top plate member. Since the recess having the same depth as the flange portion to be provided is provided, when the leg member is inserted into the through hole and joined to the top plate member, the top surface of the top plate member and the top surface of the flange portion are flush with each other. . This structure When the reinforced corrugated board or the core material according to claims 2 to 3 is joined with a water-soluble adhesive, not only the adhesion area is increased and the rigidity of the top plate member is increased, but also the leg member flange portion is multi-layered. Since the top plate member is bonded from above and below without any gaps, the mounting part of the bottomed substantially cylindrical leg with flange is further strengthened together with the strengthening of the top plate member, and the independent leg is further stabilized.

[0024] According to the paperboard three-dimensional molding pallet of claim 8, in addition to the effect of any one of claims 1 to 7, all the leg members are provided on the bottom surface of the bottomed cylindrical leg member. Since the bottom plates having a size that can be connected to each other are joined with a water-soluble adhesive, the entire pallet becomes more three-dimensional, the structural rigidity is improved, and the strength of the load carrying surface is further improved. In addition, the inconvenience of load marks on the legs on the lower package is eliminated even when the packages are stacked in multiple stages. Brief Description of Drawings

FIG. 1 is a perspective view showing an appearance of a first embodiment of a paperboard three-dimensional molding pallet according to the present invention.

FIG. 2 is a cross-sectional view of a principal part showing a joined state of the leg member and the top plate member of the first embodiment.

FIG. 3 is a cross-sectional view of a main part of the second embodiment.

FIG. 4 is a cross-sectional view of a main part of the third embodiment.

FIG. 5 is a perspective view of a bottomed substantially cylindrical leg of the first embodiment.

FIG. 6 shows one form of a bottomed substantially cylindrical leg material pattern according to the first embodiment.

FIG. 7 is a perspective view showing the appearance of the fourth embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a paperboard three-dimensional molding pallet according to the present invention will be described with reference to FIGS.

[Embodiment 1 of the Invention]

[0028] FIG. 1 is a perspective view showing an appearance of Embodiment 1 of a paperboard three-dimensional pallet according to the present invention.

[0029] In the first embodiment, the flat plate member 1 is joined to the top plate member 1 by a flange portion that penetrates the top plate member 1 and is provided at the edge of the bottomed substantially cylindrical leg 2. Nine bottomed nearly cylindrical legs 2 and It is configured.

[0030] FIG. 2 is a cross-sectional view of a main part of the first embodiment according to the present invention.

[0031] The top plate member 1 has a through hole 15 through which the bottomed substantially cylindrical leg 2 penetrates, and the diameter of the hole is exactly the same as the outer diameter of the flange base of the bottomed substantially cylindrical leg 2 It is supposed to be joined. Here, a dent 16 having the same depth as the thickness of the flange portion is provided around the hole so that the flange of the bottomed substantially cylindrical leg 2 is embedded, and the top plate member 1 and the bottomed substantially cylindrical leg 2 are When joined, it is desirable that the top surface of the top plate member 1 and the top surface of the flange portion of the bottomed substantially cylindrical leg 2 are flush with each other.

[0032] Since the top surface of the top plate member 1 and the top surface of the flange portion of the bottomed substantially cylindrical leg 2 are flush with each other, as shown in FIG. 3 or FIG. When the plate core 4 is joined with a water-soluble adhesive, the bonding surface becomes flat, so the bonding area between the top plate member 1 and the reinforced corrugated board 5 or corrugated core 4 increases, and the bottomed substantially cylindrical shape The flange of the leg 2 is also strengthened. Since the top plate member is bonded without any gaps from above and below, the attachment part of the bottomed cylindrical leg 2 is strengthened together with the strengthening of the top plate member, and the independent leg is further stabilized.

[0033] The compression molding method for the top plate member 1 and the bottomed substantially cylindrical leg 2 is made from the slip sheet described in Japanese Patent Laid-Open No. 2000-177033, which has been invented and proposed by the inventors of the present invention. If you use a precision three-dimensional three-dimensional thin paper press forming method or a molding method based on this method,

[0034] In general, laminated flat sheet has the property that fibers are arranged in a specific direction at the time of manufacture. Therefore, the finished laminated flat sheet has directionality and bending strength varies greatly depending on the direction. There is a nature. Therefore, in order to have almost the same bending strength in both the vertical and horizontal directions of the top plate member 1, the direction of the fiber is changed for each layer of the laminated flat paper as a raw material when forming. As a molding material, it is desirable to use a laminated sheet of laminated sheets in which a plurality of sheets are stacked while being shifted by a predetermined angle as much as possible (for example, four sheets are stacked at 90 degrees in four directions). As a result, the deformation such as warpage and shrinkage unique to the conventional flat sheet paper molding is made uniform, and as a result, the paperboard three-dimensional molding pallet has uniform bending strength and rigidity over the entire surface, and warpage deformation is unlikely to occur. A product is obtained. In the case of stacking a plurality of sheets, water is added to the laminated flat sheet paper, and then an adhesive is applied to the stacked surface, followed by high-density compression molding.

[0035] As the adhesive, a water-soluble butyl acetate adhesive is used. Specifically, Pegar 210PR, Pegar Nole 100HHR, Pegar Nole 1540, Pegar Nole 517R (manufactured by High Pressure Gas Industry Co., Ltd.) are recommended. These have been confirmed to comply with the Food Sanitation Law 'standards for food and additives (Ministry of Health and Welfare Notification No. 370 of 1959), and the burden on workers and the environment is small. For easy application, the adhesive may be diluted with 10% to 100% water by volume and used.

[0036] By using a water-soluble vinyl acetate adhesive, the top board member 1, the bottomed substantially cylindrical leg 2, and all components of the adhesive can be submerged in water by immersing the entire paperboard three-dimensional molding pallet in water. Since it can be melted, it can be easily reused as a raw material for new laminated flat paper.

FIG. 5 is a perspective view of the bottomed substantially cylindrical leg 2 used in Embodiment 1 of the paperboard solid molded body pallet according to the present invention.

FIG. 6 shows one form of the raw material pattern cut out from the laminated flat sheet in order to form the bottomed substantially cylindrical leg 2 with high density compression molding. Fold the valley along broken line 19 to raise the side wall,

The bottom 20 is formed into a substantially cylindrical leg 2 by high-density compression molding so that the flange is opened to the outside.

[0039] In order to perform compression molding without generating cracks in the bent portion, the raw material pattern 6 is absorbed before the molding so as to have a moisture content of 40 to 90%. Set in a mold consisting of an upper mold and a lower mold with a rounded bottomed cylindrical shape with an R shape, and apply a pressure of about ltonZcm ² to the raw interleaving paper 6 with this mold. Molding was performed using a compression molding machine that was heated to a temperature of ˜250 ° C. and capable of dehydration under pressure until a moisture content of 2 to 3% was achieved.

[0040] Here, the compression ratio by compression molding is 70% to 80% when the thickness of the laminated flat sheet before moisture is 100%, and the thickness is 1mm to 3mm or less, and the thickness exceeds 3mm. When the thickness is 30 mm or less, or when multiple sheets with a thickness of 3 mm or less are stacked to be 3 mm or more, it is confirmed that the mechanical properties of the compression molded product show a high value when it is 50 to 70%. . Note that when multiple sheets are stacked, an adhesive is applied to the stacked surface, but it should be noted that the strength of the molded product may decrease by less than 10% if an adhesive containing 30% or more of water is used. Use undiluted adhesive when emphasizing the mechanical strength of the molded product, and reduce the thickness appropriately when emphasizing workability. Use the adhesive that was used.

[0041] The opening angle of the notch 18 for forming the wall surface provided in the raw material pattern 6 of the bottomed substantially cylindrical leg 2 depends on the number of wall surfaces, the rising angle of the wall surface, and the plate thickness of the raw material pattern 6. Adjust the angle so that there is no gap between adjacent walls after molding (preferably like a barrel, so that the side edges of the wall will come into close contact when tightened). For example, when forming a bottomed approximately cylindrical leg 2 consisting of 5 walls and having a wall rise angle of 83 degrees with a plate thickness of 4 mm, the opening angle of the notch 18 of the raw material pattern 6 is set to 65 degrees. A bottomed substantially cylindrical leg 2 in which side end surfaces of adjacent wall surfaces are in contact with each other or close to each other was obtained. Even if there are some gaps between the wall surfaces after molding, the bottomed substantially cylindrical legs 2 should be in close contact with each other by being penetrated and joined to the through holes of the top plate member. Les.

[0042] The number of divisions of the wall surface is preferably as small as possible to increase the load bearing strength of the bottomed substantially cylindrical leg 2. However, even when moisture is absorbed, the laminated flat sheet is hardly plastic or stretchable. Unreasonable molding will cause cracks in the molded product. Depending on the thickness of the raw material pattern 6 used for molding, it can be molded in 3 divisions if the wall thickness is around lmm, and if the wall thickness exceeds 10 mm, 8 divisions are required. It is confirmed that a molded product with a plate thickness of 6 mm has a maximum compressive load strength of 530 kg or more, and in order to obtain the load bearing strength of legs normally required for pallets, a laminated plate with a plate thickness of 4 mm to 6 mm is used. It is sufficient to use two or three laminated flat sheet papers with a thickness of 2 mm and a thickness of 2 mm. In this case, it is preferable to divide the wall surface into 5 to 6 parts.

[0043] The rise angle of the wall surface of the bottomed substantially cylindrical leg 2 should be 90 degrees considering only the vertical load strength, but the pallet leg is subjected to a rolling load such as truck transportation, so the top is thick. As a cup-shaped, generally cylindrical shape, the rolling load strength that does not impair the vertical load strength is strengthened. For this purpose, the rising angle of the wall surface of the bottomed substantially cylindrical leg 2 should be 70 to 89 degrees. If it is less than 70 degrees, the vertical load resistance will decrease. Stress may concentrate and the base of the leg may be refracted. Preferably 78 degrees to 86 degrees is adopted.

[0044] It should be noted that the paper tube having the same inner diameter as the outer diameter of the cylindrical leg, even when the rising angle of the wall surface of the substantially cylindrical leg 2 with a bottom is 90 degrees and the wall surface is a complete cylindrical leg. Fit into the cylindrical leg A sufficient strength can be obtained by jointly mounting. In cases where the increase in the number of parts or cost is not a problem, such a configuration can be used.

[0045] According to the thickness of the raw material pattern 6 to be used, the depth of the notch 17 for bending the outward flange of the bottomed substantially cylindrical leg 2 will cause cracks in the wall surface unless the depth of cut is increased. However, if the depth is too deep, the strength of the wall surface will decrease, so the adjustment should be made within the range where no cracks occur. Experimentally, a notch with a depth 1.5 to 2 times the flange overhang is preferably used. The number of cutouts is 5 when the bottomed cylindrical leg 2 with a flange having a wall surface divided into 5 is formed, and if the thickness of the material slip sheet is 5 mm or less per one wall surface, the thickness exceeds 5 mm. In this case, it is better to cut out two. If the depth of the notch is deep or the number of notches is large, forming is easy, but the strength after molding is poor.

[0046] The bottomed substantially cylindrical leg 2 compression-molded as described above is inserted into a through-hole formed in the top plate member 1, and the flange portion is bonded to the top plate member 1 with a water-soluble adhesive. Thus, Embodiment 1 of the paperboard three-dimensional pallet will be described.

Example 1

[0047] In order to confirm the load-bearing strength of the substantially cylindrical leg 2 with a bottom, the outer diameter of the bottom surface is 100 mm, the outer diameter of the flange base is 120 mm, and the height is 5 mm from the raw material pattern 6 with a thickness of 6 mm. A bottomed substantially cylindrical leg 2 having a thickness of 10 Omm was formed, and a maximum compression load test was performed on one leg member in a form corresponding to the first embodiment. Further, from the same raw material pattern 6 as in the example, a cylindrical leg of a pentagonal cylinder having a pentagonal bottom surface and a flat side wall was formed in the same manner as a comparative example.

[table 1]

(Unit: kg)

[0048] As can be seen from Table 1, one bottomed substantially cylindrical leg 2 formed from a raw material pattern 6 having a thickness of 6 mm showed a maximum compressive load strength of 544 kg. On the other hand, a pentagonal cylindrical leg member formed from the same raw material pattern 6 and having a flat side wall has only a maximum compressive load strength of 364 kg. It was.

Example 2

[0049] In order to confirm the load-bearing strength when the bottomed substantially cylindrical leg 2 is stacked, the bottomed substantially cylindrical leg 2 formed by laminating and stacking 2 sheets of raw material pattern 6 having a thickness of 2 mm was carried out. In Example 2, the seams of the divided wall surfaces are combined without overlapping each other, and in Comparative Example 2, the seams of the divided wall surfaces are combined so as to overlap each other. A bottomed substantially cylindrical leg 2 having a flange base outer diameter of 120 mm and a height of 100 mm was molded, and a maximum compression load test was performed on one leg member.

[Table 2]

(Unit: kg)

[0050] As can be seen from Table 2, in Example 2, which was molded in combination so that the cuts of the divided wall surfaces of the raw material pattern 6 did not overlap, one piece showed a maximum compressive load strength of 402 kg. On the other hand, Comparative Example 2 formed so that the cuts of the dividing wall surfaces overlap each other showed only a maximum compressive load strength of 358 kg. It should be noted that the adhesive strength of 20% by volume of water is applied to the bonding surface of the two water-containing raw material patterns 6, and the mechanical strength can be further improved by applying the stock solution adhesive.

[0051] [Embodiment 2 of the Invention]

[0052] Fig. 3 is a cross-sectional view of a main part of the second embodiment according to the present invention.

In the second embodiment, the side end portion of the top plate member 1 of the first embodiment is raised by a predetermined length to form a side end rising 8. Use reinforced corrugated cardboard 5 sold inside the side edge rise 8 and join it with a water-soluble adhesive.

In Embodiment 2 according to the present invention, a commercially available reinforced corrugated cardboard 5 is bonded to make the top board a reinforced top board. By selecting the tool, the top plate member has a strength corresponding to the weight of the luggage to be transported. is doing.

[0055] The height of the side edge rise 8 is preferably higher than the thickness of the reinforced corrugated cardboard 5 to be bonded, and serves as a fall prevention wall for the load. It becomes a prevention wall.

[0056] The size of the raw laminated flat sheet used for the top plate member 1 is adjusted according to the height of the side edge rising 8 so that the area of the load carrying surface of the top plate member 1 is not reduced. .

[Embodiment 3 of the Invention]

[0058] FIG. 4 is a cross-sectional view of a main part of the third embodiment according to the present invention.

[0059] Embodiment 1 has a minimum function as a pallet. When not used for transporting heavy objects, the pallet itself is required to be lightweight and easy to handle. However, when transporting heavy objects that mainly use wooden pallets, the pallet with high strength and rigidity of the load carrying surface shown in Embodiment 3 is required.

[0060] Therefore, in Embodiment 3 according to the present invention, the corrugated core material 4 is bonded onto the top plate member 1, and the surface outer member 3 is further bonded to the corrugated core material 4. The top plate member 1 is a multi-layer strengthened top plate member, and has been devised to provide strength that is practically acceptable even when carrying heavy objects.

[0061] The core material can be used as long as it is made of paper having a certain height and capable of defining the distance between the top plate member 1 and the surface shell member 3 to be constant.

[0062] In FIG. 4, two corrugated core materials 4 each having a corrugated shape having a uniform height and a transverse cross section made of a high-density compression-molded product are bonded to each other with a 90-degree offset. Yes. Since the wave shape has a wide adhesive area, a square wave shape with a flat top is preferable. Three or more corrugated core materials 4 may be attached.

[0063] The direction in which the two corrugated cores 4 are shifted is not limited to 90 degrees, and can be any angle between 1 and 90 degrees. According to the high-density compression molding method used in the present invention, by adjusting the direction in which the laminated flat sheet paper used as a raw material is placed in the mold, it is possible to compress and mold waves in any direction without taking out the end material. S can.

[0064] The adhesive is at least a portion where the top of the wave of the top plate member 1 and the corrugated core 4 contacts, a portion where the top of the corrugated core 4 contacts, and a corrugated core 4 wave tops and off-surface It is applied to the part where the contour member 3 comes into contact. When it is more important to save the labor of applying the adhesive than the amount of adhesive used, the top surface of the top plate member 1, the both surfaces of the corrugated core material 4, and the back surface of the surface outer member 3, You may apply | coat an adhesive agent to each whole surface.

[0065] On the surface of the surface outer member 3, irregularities and three-dimensional shapes that match the shape of the goods to be transported can be formed simultaneously with the compression molding. If the load to be transported is spherical or cylindrical and easily rolls, or if there is unevenness on the bottom of the load and it cannot be placed stably, the unevenness that matches the shape is formed in advance on the surface of the surface outer member 3, It is possible to create a special pallet with no stickiness.

[Embodiment 4 of the Invention]

FIG. 7 is a perspective view of Embodiment 4 according to the present invention.

[0068] In the fourth embodiment, a leg reinforcing plate 7 made of a high-density compression-molded product is adhered to the bottom surface of all leg members with a water-soluble adhesive to reinforce and stabilize the leg parts, and the pallet. It has structural rigidity throughout.

[0069] Further, since the bottom surface of the pallet becomes flat, when the pallets are stacked in multiple stages, it is possible to prevent the bottom of the bottomed substantially cylindrical leg 2 from being rounded on the surface of the loaded luggage.

Industrial applicability

[0070] According to the present invention, it can be used as a paperboard three-dimensional pallet having a sufficient load carrying surface rigidity and leg load resistance strength for practical use as a pallet, and of course, it was finally disposed of as a disposal treatment. Even in this case, as a paperboard three-dimensional molding pallet designed so that it can be recycled as a raw material for new paperboard three-dimensional molding pallets or other rigid paper products without the need to sort each member by material. Can be used.

Explanation of sign

[0071] 1 Top plate member

2 Cylindrical leg with bottom

3 Surface shell

4 Corrugated core material

5 reinforced cardboard

6 Raw paper pattern Leg reinforcement plate

Side edge rise

Penetration hole

Dent

Notch (small)

Notch (large)

Wall valley folding position (dashed line) Flange mountain folding position (dashed line)

Claims

The scope of the claims

[1] It has a paper-made flat top plate member and a paper-made bottomed cylindrical leg member, and the top plate member has a plurality of through holes, and the leg member Is a paperboard three-dimensional pallet formed by joining the top plate member with a water-soluble adhesive in a state in which a part of the leg member is inserted into the through hole, and the top plate member and the leg member Is a paperboard three-dimensional molding pallet characterized by comprising a high-density compression-molded product that has been subjected to pressure heating and dehydration treatment in a mold in order to form the laminated flatboard interleaving paper that has absorbed water into a predetermined shape.

[2] The top plate member is formed by forming a side wall at a side end portion thereof with a rising force S, and a reinforced corrugated cardboard is bonded to a flat portion inside the side wall with a water-soluble adhesive. The paperboard three-dimensional molding pallet according to claim 1, wherein

[3] The top plate member is made of a water-soluble plate-shaped core member having a concavo-convex shape in cross section and a plate-shaped outer member having a size covering the surface and Z or the back surface of the core member. 2. The paperboard three-dimensional molding pallet according to claim 1, wherein the pallet is joined by an adhesive.

[4] The leg member has a circular bottom surface, a wall surface having an arcuate cross section rising upward from the circular bottom surface, and an outward flange portion extending horizontally from the wall surface. The paperboard three-dimensional molding pallet according to any one of claims 1 to 3, wherein the paperboard three-dimensional molding pallet has a cylindrical shape and is joined by joining an upper surface of the top plate member and a flange portion of the leg member.

[5] The leg member is composed of a plurality of divided wall surfaces whose wall surfaces are divided into 3 to 8 along the circumferential direction, and side end surfaces of adjacent divided wall surfaces are in contact with or close to each other. The paperboard three-dimensional molding pallet according to claim 4, wherein the leg member is a leg member.

[6] The leg member is formed by superimposing a plurality of the bottomed substantially cylindrical leg members, and side end surfaces of the divided wall surfaces of the superimposed leg members do not overlap each other on the circumference. 6. The paperboard three-dimensional pallet according to claim 5, which is combined.

[7] The concave portion having the same depth as the thickness of the flange portion in which the flange portion is submerged is provided around the through hole of the top plate member. The paperboard three-dimensional molding pallet described in one.

[8] The bottom surface of the leg member has a size capable of connecting all the leg members. The paperboard three-dimensional molding pallet according to any one of claims 1 to 7, wherein the bottom plate is joined with a water-soluble adhesive.