JPH07205993A - Pallet - Google Patents

Abstract

PURPOSE:To provide a pallet wherein interlayer peeling may not occur at joints with a load receiving member on an upper plate and a lower plate even if a large load in a side direction is applied to the load receiving member coupling between the upper and lower plates. CONSTITUTION:A plurality of corrugated fiberboards 10 are overlaid, and overlapping faces of the fiberboards 10 are joined to one another for forming an upper plate 21 and a lower plate 22. A plurality of the corrugated fiberboards 10 are stacked to form a load receiving member 23. Both end faces 23a, 23b of this load receiving member 23 are adhered to the upper plate 21 and the lower plate 22. Reinforcing holes 3 entering from the adhered face of the load receiving member 23 inward are provided on the upper plate 21 and the lower plate 22 and filled with adhesive 4. Resin adhesive with a filler such as cement mixed is preferably used as the adhesive 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pallet using cardboard as a material.

[0002]

2. Description of the Related Art Conventionally, since corrugated board is light in weight but strong in strength and absorbs impact force, as shown in FIG.
1, the lower plate 12, and the load receiving member 13 which is a girder material (see Japanese Utility Model Laid-Open No. 62-14673). That is, each component 1 of this pallet 1
1, 12, and 13 are one-sided or double-sided corrugated board 10 in which a liner (flat paper material) 10b is fixed to one side or both sides of a corrugated plate 10a with an adhesive, and the superposed surfaces thereof are bonded to each other with an adhesive. It has a fixed configuration. Both end surfaces of the load receiving member 13 in the vertical direction A are respectively bonded to the upper plate 11 and the lower plate 12 with an adhesive, so that the load of a luggage (not shown) placed on the upper plate 12 can be applied in the vertical direction A.
To receive.

[0003]

By the way, when the pallet 1 is used, the load receiving member 13 is such that the ascending / descending claws 8 of the forklift hit the side, or the rope 9 is used.
Wrapped around and pulled laterally, it receives a lateral load, that is, a lateral load. At this time, since the end surface of the load receiving member 13 on which the lateral load is concentrated and the liner 10b of the innermost corrugated cardboard 10 of each of the upper plate 11 and the lower plate 12 are firmly bonded by an adhesive, This liner 10
In b, a so-called delamination B occurs, in which the upper layer portion (surface layer portion) bonded to the load receiving member 13 and the lower layer portion are broken, and the upper layer portion is peeled from the lower layer portion.

Therefore, the present invention has been made in view of the above-mentioned problems. Even when a large lateral load is applied to the load receiving member, the upper plate and the lower plate can be joined to the load receiving member at their joints. It is intended to provide a pallet in which delamination does not occur.

[0005]

In order to achieve the above-mentioned object, the present invention provides a pallet with an upper plate and a lower plate which are formed by stacking a plurality of corrugated boards and joining the superposed surfaces of the corrugated boards to each other. , A load receiving member made of corrugated cardboard or paper, both end surfaces of the load receiving member being adhered to the upper plate and the lower plate, and inward from the bonding surface of the load receiving member to the upper plate and the lower plate. Providing a reinforcing hole to enter,
An adhesive is filled in the reinforcing hole. Further, it is preferable to use a resin-based adhesive mixed with a filler as the adhesive filled in the reinforcing hole. As the filler, for example, cement powder, sand, soft stone, and dried grains such as corn, rice, and beans can be used. Further, it is preferable to use the same kind of adhesive as the adhesive with which the both ends of the load receiving member are adhered to the upper plate and the lower plate as the adhesive filled in the reinforcing hole.

[0006]

When the load receiving member of the pallet collides with the lifting claw of the forklift, or when a large load is applied in the lateral direction due to the rope being wound and pulled, the twisting force due to this lateral load is applied to the reinforcing hole. The upper plate and the lower plate are dispersed and received via an adhesive that is solidified inside and is connected to the end surface of the load receiving member. Therefore, the lateral load is not concentrated on the joint between the upper plate and the lower plate and the end face of the load receiving member, so that the delamination in which the liner of the corrugated board is internally peeled off is prevented. Further, when an adhesive in which a filler is mixed in a resin adhesive is used as the adhesive to be filled in the reinforcing hole, shrinkage is suppressed, so that the adhesive is dented from the adhesive surface (end surface) of the load receiving member. In addition to preventing the adhesive from being integrated with the adhesive applied to the adhesive surface, the resin-based adhesive dries quickly. Further, when the same kind of adhesive as the adhesive on both end faces of the load receiving member is used as the adhesive filled in the reinforcing hole, both adhesives are firmly integrated.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The pallet of the present invention will be described below with reference to the preferred embodiments shown in the drawings. FIG. 1 (a) is a longitudinal sectional view of an essential part of an embodiment of the present invention, and FIG. 1 (b) is a sectional view taken along line DD of FIG. 1 (a). In this pallet 2, both end faces 23a, 23b of the load receiving member 23 in the vertical direction are adhered to the upper plate 21 and the lower plate 22, and this configuration is similar to that of the conventional pallet.

The upper plate 21 and the lower plate 22 are corrugated plates 10a.
2 double-sided corrugated board with two liner 10b stuck on both sides of
0 is laminated in a total of 4 layers. FIG. 1A shows a state in which the upper plate 21 and the lower plate 22 are cut along the center line of a cylindrical load receiving member 23 described later.
In the upper plate 21 and the lower plate 22, for example, eight reinforcing holes 3 that penetrate inward from the bonding surface of the load receiving member 23 are formed annularly as shown in FIG. In this reinforcing hole 3, Sebian (trade name) which is a kind of resin adhesive
Is mixed with a cement powder that is well compatible with this, and the mixture is filled with an adhesive 4 which is kneaded in a slightly hardened manner. Reinforcing hole 3
Preferably has a shape that does not penetrate so that the adhesive 4 can be held inside, but its cross-sectional area and depth may be arbitrary and may be appropriately determined depending on the situation.

The load receiving member 23 has a cylindrical core tube 5 made of paper thicker than the liner 10b of the corrugated board 10 as a center, and the single-sided corrugated board 10 in which the liner 10b is adhered to one side of the corrugated plate 10a is spirally wound. In addition, a thick paper is wrapped around the outermost corrugated cardboard layer to protect the protective tube 6
Are formed. Multiple layers (4 layers are shown in the figure)
The inner liner 10b and the outer corrugated plate 10a, which overlap each other between adjacent corrugated cardboard layers, are fixed to each other with an adhesive. Moreover, the edge 10c shown by the solid line in FIG. 1A of the outer corrugated board in the adjacent corrugated board layers and the edge 10d shown by the broken line of the inner corrugated board 10 are set so as not to overlap each other. That is, the corrugated board 10 in each of the corrugated board layers adjacent to each other has a winding pitch of 1 /
It is wound in a state of being shifted by 2 pitches. As a result, each corrugated board layer is formed in an accurate cylindrical shape.
The load receiving member 23 has an advantage that the compressive strength, the second moment of area, and the bending rigidity when a load of a load is received in the vertical axis direction are significantly increased.

Both end faces 23a, 23 of the load receiving member 23
b is fixed to the upper plate 21 and the lower plate 22. This fixing is performed by filling the reinforcing hole 3 with the above-mentioned adhesive 4 and then applying the adhesive 7 made of only Sebian to a slightly wider area than that of the end surfaces 23a and 23b of the load receiving member 23, that is, to the end surfaces 23a and 23b. This is done by applying a thin coating having a diameter slightly larger than the diameter, and pressing the end faces 23a, 23b of the load receiving member 23 against the applied adhesive 7 to bond them.

As described above, if the cement 4 mixed with the cement is used as the adhesive 4 to be filled in the reinforcing hole 3, if only the Sebian is used, the contraction occurs and the load receiving member 23 is contacted with the cemented surface. This is because the end faces 23a and 23b of the load receiving member 23 may not be integrally connected with the adhesive 7 and the dryness is poor. The same effect as described above can be obtained by using, as the filler mixed in Sebian, instead of cement, for example, soft stones, sand, corn, dried grains such as rice and beans. Here, soft stones are used for corrugated cardboard 1
This is to prevent tooth spillage from occurring in the cutter for cutting the corrugated board when it is dissolved in a solvent and recycled after cutting 0. It should be noted that cement, sand or soft stones can be easily removed by precipitating them at the time of recycling, and grains dissolve in the solvent of the corrugated board 10, so that the excellent features of the corrugated board 10 for recycling are not impaired.

As the adhesive 4, other than Sebian,
Adhesives having excellent cardboard joint strength can be appropriately selected and used, but the end faces 23a, 23 of the load receiving member 23 can be used.
The same type of adhesive 7 used to bond b to the upper plate 21 and the lower plate 22 (for example, both adhesives 4 and 7 are both Severian)
Is preferable because it is firmly integrated with the adhesive 7. Further, the adhesive may be used alone without mixing the cement or the like with the adhesive.

In the pallet 2 of the above embodiment, the adhesive 4 solidified in the reinforcing hole 3 has the end faces 23a, 23 of the load receiving member 23.
Since the load receiving member 23 is integrally connected with the adhesive 7 of FIG. 4b, even if a large lateral load is laterally applied to the load receiving member 23 in the cylindrical radial direction, the adhesive 4 resists the lateral load. While acting to prevent delamination due to lateral load, the twisting force due to lateral load is dispersedly received by the upper plate 21 and the lower plate 22 via the adhesive 4. Therefore, the end surfaces 23a, 23 of the load receiving member 23 in the upper plate 21 and the lower plate 22 are
Since the lateral load is not concentrated on the portion joined to b, delamination is prevented from occurring in the liner 10b joined to the end faces 23a and 23b of the upper plate 21 and the lower plate 22. In fact, the load that causes delamination depends on the reinforcing hole 3
Compared with the one without the structure filled with the adhesive 4,
It has reached 5 times.

Moreover, in the above embodiment, the load receiving member 23
Since the adhesive 7 for adhering the end surfaces 23a, 23b of the adhesive 7 is applied in a size larger than the diameter of the end surfaces 23a, 23b, when the end surfaces 23a, 23b are pressed against the adhesive 7, the adhesive 7 Adhere to the outer peripheral edge surfaces near the end surfaces 23a and 23b so as to rise, as shown in FIG.
Thereby, the load receiving member 23 and the upper plate 21 and the lower plate 22.
The joint strength with is greatly improved. In addition, the load receiving member 23
By covering the outer periphery of the protective tube 6 formed by winding thick paper, it is possible to prevent the load receiving member 23 from being damaged by an impact from the side such as the lifting claws of the forklift.

Further, in this embodiment, the load receiving member 23
Is formed by spirally winding the corrugated cardboard 10, and the superposed surfaces of a plurality of corrugated cardboard layers forming this cylindrical shape are bonded to each other. Therefore, since the ridgeline of the corrugated plate 10a is inclined with respect to the axis of the cylindrical load receiving member 23, a lateral load, that is, a cylindrical load F in the radial direction is applied as shown in FIG. 1 (a). In this case, the first stress F1 may be reduced by the first stress F1 in the direction orthogonal to the ridge line and the second stress F2 in the ridge line direction against the load F, so that the first stress F1 may decrease in the radial direction. Has the advantage of improving rigidity against external force

FIG. 2 shows a cut-away plan view of another embodiment of the present invention. The load receiving member 24 of the pallet 2 of this embodiment forms the flat corrugated board 10 into a cylindrical shape by spirally winding a plurality of times around the core tube 5 in a spiral shape without losing its shape. The cardboards 10 to be formed have a structure in which the superposed surfaces are joined together. Other configurations are similar to those of the above-described embodiment, and similar effects can be obtained, and there is an advantage that the compressive strength, the second moment of area, and the bending rigidity when a load of a load is vertically applied are significantly increased.

In addition to the load receiving members 23 and 24 described above, a liner which is one of the components of the corrugated board 10 or a flat paper thicker than this is wound around the core tube a plurality of times to form a cylindrical shape. You may use the thing of the shape. Further, a plurality of flat plate-shaped cardboards 10 shown in FIG.

[0018]

As described above, according to the pallet of the present invention, the upper plate and the lower plate are provided with the reinforcing holes penetrating inward from the bonding surfaces of both end surfaces of the cylindrical load receiving member, Since the reinforcing hole is filled with the adhesive, even if a large external force is applied to the load receiving member in the lateral direction, the lateral load is solidified in the reinforcing hole and connected to the load receiving member. As it is dispersed and received by the upper plate and the lower plate via the adhesive that is applied,
It is possible to prevent the load from being concentrated on the joint surface between the upper plate and the lower plate and the load receiving member. Therefore, it is possible to reliably prevent delamination in the innermost liner of the corrugated board forming the joint surface.

Further, as an adhesive filled in the reinforcing hole,
When a resin-based adhesive mixed with a filler is used, shrinkage is suppressed, so that the adhesive is recessed from the adhesive surface (end surface) of the load receiving member and is not integrated with the adhesive applied to this adhesive surface. As a result, the delamination is prevented more effectively, and the resin-based adhesive dries faster, resulting in improved productivity. When the pallet made of corrugated cardboard or paper is dissolved in a solvent for recycling, the above-mentioned filler is dissolved in the solvent or precipitated and removed, so that the excellent features of recycling the pallet are not impaired. Furthermore, as an adhesive filled in the reinforcing hole,
If the same kind of adhesive is used as the adhesive on both end faces of the load receiving member, both adhesives are firmly integrated and the lateral load is effectively dispersed, so that delamination is more effectively prevented. To be done.

[Brief description of drawings]

FIG. 1A is a partially cut side view of an embodiment of the present invention, and FIG. 1B is a sectional view taken along line DD of FIG.

FIG. 2 is a partially cutaway plan view showing another embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a conventional pallet.

[Explanation of symbols]

2 ... Pallet, 3 ... Reinforcing hole, 4, 7 ... Adhesive, 10 ... Corrugated board, 21 ... Upper plate, 22 ... Lower plate, 23, 24 ... Load receiving member, 23a, 23b ... Both end faces of load receiving member, 3 ... Reinforcing holes, 4 ... Adhesive.

Claims (3)

[Claims] 1. An upper plate and a lower plate, which are formed by stacking a plurality of corrugated board and joining the superposed surfaces of the corrugated board, and a load receiving member made of corrugated cardboard or paper. Both end surfaces of the load receiving member. Is adhered to the upper plate and the lower plate, and the upper plate and the lower plate are provided with a reinforcing hole that penetrates inward from the bonding surface of the load receiving member, and the reinforcing hole is filled with an adhesive. . 2. The pallet according to claim 1, wherein the adhesive filled in the reinforcing hole is a resin-based adhesive mixed with a filler. 3. The pallet according to claim 1, wherein the adhesive filled in the reinforcing hole is the same as the adhesive that adheres both end surfaces of the load receiving member to the upper plate and the lower plate. .