JP3316087B2 - Corrugated paper tube and pallet using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a corrugated paperboard tube using single-sided corrugated cardboard as a material and a pallet using this corrugated paperboard tube as a load receiving member (girder material).

[0002]

2. Description of the Related Art Corrugated cardboard has the features of being light in weight but having high strength and absorbing impact force. For this reason, conventionally, in addition to boxes, cardboard has been used as a material constituting part or all of a pallet on which luggage is placed (for example, US Pat. No. 2,728,545;
No. 3,683,822 and No. 4,831,938
No. 4,792,325 and No. 4,867,07
No. 4). Also, unlike cardboard, cardboard has the advantage that it is extremely easy to recycle and has excellent recyclability.

FIG. 12 shows an example of a pallet 70 in which an upper plate 71, a lower plate 72, and a load receiving member 73, which is a girder member, are respectively formed by using cardboard as a constituent material. That is, the upper plate 71, the lower plate 72, and the load receiving member 73 of the pallet 70 are each made of a double-sided cardboard or a double-sided cardboard in which a liner (flat paper material) 2b is fixed to both sides of the corrugated plate 2a with an adhesive. In this configuration, a plurality of 2M sheets are stacked and their polymerized surfaces are fixed to each other with an adhesive. The load receiving member 73 has both end surfaces in the vertical direction A bonded to the upper plate 71 and the lower plate 72 with an adhesive, respectively, and receives a load of a load (not shown) placed on the upper plate 72. Receive in the vertical direction A.

[0004]

However, the load receiving member 73 used as the beam of the pallet 70 is
It cannot be said that the mechanical properties and workability of the corrugated cardboard 2 as a constituent material are fully utilized, and there are drawbacks such as the inability to obtain a large strength or low productivity.

That is, the load receiving member 73 shown in FIG. 12 has a configuration in which a plurality of unbent flat cardboards 2M are merely superposed and bonded to each other.
With the superposed surface of M facing up and down A,
1 and the lower plate 72. Therefore, there is a disadvantage that the compressive strength, the second moment of area, and the bending rigidity in the vertical direction A under the load are all small. In addition, when producing the load receiving member 73, a plurality of rectangular cardboards must be superposed and adhered one by one, and there is a problem that the productivity of the load receiving member 73 is low.

When the pallet 70 is used, the load receiving member 73 is brought into contact with a lifting claw 80 of a forklift from the side or around a rope 90 as shown by a two-dot chain line in FIG. Or a side load, that is, a lateral load F. At this time, the end face of the load receiving member 73 where the lateral load F is concentrated and the innermost cardboard 2M of each of the upper plate 71 and the lower plate 72
Is strongly bonded to the liner 2b by an adhesive, so that in this liner 2b, the upper layer (surface layer) adhered to the load receiving member 73 and the lower layer thereof are broken, and the upper layer is broken. Is separated from the lower layer, so-called delamination B
There is a problem that occurs.

The present invention solves the above-mentioned problems, and provides a corrugated paper tube which is lightweight, has excellent compressive strength, second moment of area, and bending rigidity, and has high productivity, and a pallet using the same. The purpose is to do.

[0008]

In order to achieve the above object, a corrugated cardboard tube according to one aspect of the present invention is mainly used as a load receiving member, and has a liner fixed to one surface of a corrugated plate. A long single-sided cardboard is spirally wound while being bent along a direction perpendicular to the ridgeline of the corrugated plate to form a cylindrical cardboard layer, and the single-sided cardboard layer is fixed to a plurality of layers in the radial direction. The length of the long single-sided corrugated cardboard laminated and in each single-sided corrugated cardboard layer
Side edges along hand direction do not overlap each other and
They are almost in contact with each other .

According to the above construction, the long single-sided corrugated cardboard is bent while being bent along the direction perpendicular to the ridge line of the corrugated plate.
It is spirally wound to form a cylindrical shape, and a plurality of cylindrical single-sided corrugated cardboard layers or superposed surfaces of single-sided corrugated cardboard are joined to each other to form a corrugated paper tube. Therefore, by using as a load receiving member that receives the load of the load in the axial direction of the cylindrical shape, the compressive strength, the second moment of area, and the bending rigidity of the load receiving member are significantly increased. Therefore, it is possible to obtain a lightweight and strong load receiving member.

That is, as a general property, the strength of a paper material is increased by bending it.
Since the corrugated plate is bent in a wave shape, the corrugated plate originally has a considerably high strength against a compressive load in a direction along the ridge line of the corrugated plate. However, the liner is weak because it is not bent. According to the configuration of the present invention, a plurality of cardboards are laminated, bent and fixed to each other to form a cylindrical shape, so that the liner also bends, so that a load receiving member having extremely high compressive strength can be obtained. The load receiving member made of this paper material
It is a material that makes full use of the potential strength of corrugated cardboard, has significantly higher compressive strength than any conventional paper product, and is a breakthrough in this respect.

A corrugated paper tube that can be used as the load receiving member can be manufactured by winding a single-sided cardboard into a cylindrical shape while applying an adhesive to the top of a corrugated plate of a single-sided cardboard. Good workability and high productivity.

Further, since the paper tube is formed of corrugated cardboard, it is excellent in recyclability. That is, when the corrugated paper tube is immersed in a solvent such as water to be dissolved and reused as a raw material for the corrugated cardboard, the solvent enters the holes formed by the corrugated board of the corrugated cardboard. Therefore, the contact area between the material of the corrugated cardboard and the solvent is increased, so that the corrugated paper tube is easily melted.

Further, a thick single-sided corrugated board when wound helically, by longitudinally edge along the single face corrugated elongate in each single face corrugated layer is wound in a state of almost contact, each single-sided corrugated board It is possible to set a precise cylindrical shape without a large bulge radially outward due to the overlapping portion of the layers. Therefore, the strength is further increased. In addition, the single-sided cardboard has a liner only on one surface and no liner on the other surface, so that it is easy to bend along the direction perpendicular to the ridge line of the corrugated plate, and thus has good workability.

When a single-sided corrugated cardboard is wound so that the corrugated plate is radially inward, the corrugated plate is deformed so that the interval along the circumferential direction of the top inside the corrugated plate is reduced. The higher the density, the higher the compressive strength in the axial direction.

Further, if a reinforcing material is fixed to at least one of the inner surface of the innermost single-sided cardboard layer and the outer surface of the outermost single-sided cardboard layer, the rigidity of the corrugated paper tube further increases.

The ridge of the single-sided corrugated cardboard layer is inclined with respect to the axis of the cylindrical corrugated cardboard tube. According to this configuration, when a load from the radial direction of the cylindrical shape is applied to the corrugated paperboard tube in which the ridge line of the corrugated plate is inclined with respect to the cylindrical axis, the first direction in the direction perpendicular to the ridge line is applied. The stress and the second stress in the ridge direction oppose the load. Therefore, since the first stress orthogonal to the ridgeline can be reduced,
The rigidity against the external force from the radial direction of the cylindrical shape is improved, and the strength is further increased.

In the pallet according to the present invention, both ends in the axial direction of the corrugated paper tube having the above structure are fixed to the upper plate and the lower plate of the pallet, and the paper tube is interposed between the upper plate and the lower plate as a beam. It is configured to be mounted. According to this configuration,
The load applied to the pallet acts on the corrugated paper tube (load receiving member) in its axial direction. Therefore, a pallet with high strength can be obtained. Moreover, since the paper tube made of light single-sided cardboard is used, the entire pallet becomes light. If the upper plate and the lower plate are formed of corrugated cardboard, the entire pallet becomes lighter.

Furthermore, since the single-sided corrugated cardboard is laminated in a plurality of layers, the thickness of the paper tube in the radial direction is increased, and therefore, the area of the end face is also increased. Moreover, both ends of the corrugated cardboard tube have a large number of holes due to the corrugated plate, as in a honeycomb structure. Therefore, for example, when bonding both end surfaces of the paper tube to the upper plate and the lower plate of the pallet, the adhesive enters the holes formed by the corrugated plates and adheres to the side surfaces of the corrugated plates, so that the bonding strength is improved.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A corrugated paper tube 1A according to one embodiment of the present invention.
Is used as a load receiving member. As shown in FIG. 2, a long single-sided corrugated cardboard 2 is spirally wound to have a cylindrical shape as a whole. Corrugated cardboard layer 3 formed in a cylindrical shape
_{As for n} , for example, as shown in FIG. 1B, six layers are formed, and the six single-sided cardboard layers 3 _n (n = 1 to 6) are laminated and fixed to each other in the radial direction. Stiffener 4 to single-faced corrugated board layer 3 ₁ of the inner and outer surfaces of the innermost,
5 is fixed. The reinforcing members 4 and 5 are formed by winding a paper material a plurality of times.

As shown in FIG. 1C, each long corrugated cardboard 2 is provided with a liner (flat paper material) 2b on one side of a corrugated plate 2a.
Is a general single-sided corrugated cardboard fixed with an adhesive, and is cut from a single-sided corrugated cardboard raw material 20 of FIG. 3 along a cutting line 2c indicated by a two-dot chain line. The long single-sided corrugated cardboard 2 has a direction R perpendicular to the ridge line 2d of the corrugated plate 2a.
The longitudinal direction is set so that the corrugated plate 2a is positioned radially inward and the liner 2b is positioned radially outward along a direction R perpendicular to the ridge line 2d, as shown in FIG. It is spirally wound while bending.

The single-sided cardboard 2 has a large cross-sectional moment of inertia because its cross section perpendicular to the ridge line 2d is corrugated, so it is difficult to bend along the direction of the ridge line 2d.
Since the second moment of the cross section along the ridge line 2d is small,
It is easy to bend along the direction R perpendicular to the ridgeline 2d. In particular, the single-sided cardboard used in this embodiment has an advantage that it is easy to bend as compared with the double-sided cardboard described later.

As shown in FIG. 2, the side edges 2e of the single-faced cardboard 2 along the longitudinal direction R are in contact with each other. In other words, the side edge 2e of the single-faced corrugated board 2 at 3 _n each single face corrugated layer does not overlap each other, and are substantially in contact state not separated from each other. This allows
Each single-sided cardboard layer 3 _n is formed in a precise cylindrical shape. The inner reinforcing member 4 is formed by winding a sheet of paper a plurality of times, and the side edges 4e thereof are almost in contact with each other as in the case of the single-sided cardboard 2. On the other hand, the outer reinforcing member 5 is formed by winding a sheet made of a paper material a plurality of times, and the side portions 5a slightly overlap each other. Note that, similarly to the inner reinforcing member 4, the reinforcing member 5 may be wound with the side edges 5e substantially in contact with each other.

On the other hand, the side edge 2e of the single-faced cardboard 2 is
Radially adjacent single-sided cardboard layers 3 _n and 3 _n +
₁ (n = 1 to 5), wound so as not to overlap each other, and adjacent single-sided cardboard layers 3 _n and 3 _n +
_{The one} liner 2b and the corrugated top 21 of the corrugated plate 2a are fixed to each other with an adhesive. Thereby, each single face corrugated layer 3 _n, 3 _n + ₁ is the shape retaining the cylindrical shape. For example, the side edge 2e of the longest single-sided cardboard 2 at the outermost periphery
If, the side edge 2e shown by a broken line of long single-sided corrugated board 2 inside is set to a position that does not overlap with each other, a top 21 of the outermost single-sided corrugated board layer 3 ₆ waveforms plate 2a,
By the liner 2b of single face corrugated layer ₃₅ of the inner is adhesively secured to each other, both cardboard layer _35,
3 ₆ is shape retaining the cylindrical shape.

The load receiving member 1A is, for example, shown in FIG.
As shown in FIG. 4B, both ends 1e,
1 f is adhered to the upper plate 6 a and the lower plate 6 b of the pallet 6, and is used as a beam of the pallet 6. The upper plate 6a and the lower plate 6b of the pallet 6 are made of, for example, a double-sided cardboard 2A shown in FIG. 4C or a double-sided cardboard 2B shown in FIG. 4D. Therefore, since the entire pallet 6 including the upper plate 6a, the lower plate 6b, and the load receiving member 1A is formed of light corrugated cardboard, the entire pallet becomes extremely lightweight. However, the upper plate 6a or the lower plate 6b may be made of wood.

Further, since the load receiving member 1A is formed by laminating the single-faced corrugated cardboard 2 in a plurality of layers, the thickness in the radial direction increases, and accordingly, the area of the end face also increases. Moreover, since both ends of the load receiving member 1A have a large number of holes 22 (see FIG. 1C) like a honeycomb structure due to the corrugated plate 2a, as shown in FIG. Of the corrugated plate 2a, and adheres to the side surface 23 of the corrugated plate 2a. Therefore, the bonding area is increased by that amount, and the bonding strength is improved. Note that the upper plate 6a and the lower plate 6b of the pallet 6 and the outer surface of the load receiving member 1A are subjected to waterproof treatment by winding water-resistant paper as necessary.

The load receiving member 1A of the pallet 6
Receives the load of a load (not shown) in the axial direction S. The load receiving member 1A is formed by spirally winding a long single-sided cardboard 2 and fixing and laminating a cylindrical single-sided cardboard layer _3n to each other. The compressive strength in the axial direction S, the second moment of area, and the bending stiffness are much larger than in the past. As described above, since the mechanical properties of the single-sided cardboard are effectively used, the load receiving member 1A of the pallet 6
It is light and strong.

That is, as a general property, the strength of a paper material is increased by bending. Corrugated board originally has a considerably high strength against a compressive load in a direction along the ridgeline of the corrugated board, since the corrugated board is bent in a corrugated shape. However, the liner is weak because it is not bent. On the other hand, in the present invention, as shown in FIG. 2, a plurality of single-faced cardboards 2 are laminated, bent and fixed to each other to form a cylindrical shape, so that the liner 2b also bends. Liner 2 without loss of strength
The compressive strength of b increases. Therefore, a load receiving member having extremely high compressive strength can be obtained. The load receiving member 1A made of this paper material makes full use of the potential strength of the single-faced cardboard 2 and has a significantly higher compressive strength than any conventional paper product. It is a typical member.

Further, in this embodiment, the single-faced cardboard 2
Is bent and wound so that the corrugated plate 2a is positioned radially inward, so that the top 21 inside the corrugated plate 2a is
Since the corrugated plate 2a is deformed so that the interval along the circumferential direction becomes smaller, the density of the corrugations increases, and the compressive strength of the load receiving member 1A further improves.

[0029] In particular, the load receiving member 1A, since the side edge 2e with each other in each single face corrugated layer 3 _n are in contact with each other, even a thick single-sided corrugated board 2 than ordinary paper, the single-faced corrugated board since it is possible to layer 3 _n to a precise cylindrical, strength of the load receiving member 1A is further increased more greatly.

Further, since the single-faced cardboard 2 is easily dissolved in a solvent such as water and becomes a raw material of the cardboard again, the recyclability is high. That is, when the corrugated paper tube is immersed and dissolved in the solvent, the solvent enters into the holes 22 formed by the corrugated board of the corrugated cardboard. Accordingly, the contact area between the material of the single-sided cardboard 2 and the solvent is increased, so that the load receiving members 1A,
That is, the corrugated paper tube is easily melted.

Further, since by fixing a reinforcing material 4, 5 on one side cardboard layer 3 ₁ of the inner surface and the outermost layer of the outer surface of the single-faced corrugated board layer 3 ₄ of the first layer, the rigidity of the load receiving member 1A is It is further improved and the strength is further increased. Even if the reinforcing members 4 and 5 are only one of the inner side and the outer side,
There is considerable reinforcement effect.

Further, in the load receiving member 1A, since the ridge line 2d of the corrugated plate 2a is inclined with respect to the axial direction S, when a load F from a radial direction is applied as shown in FIG. The first stress σ1 in the direction orthogonal to the ridgeline 2d (FIG. 3) and the second stress σ2 in the ridgeline direction oppose the load F. Accordingly, since the first stress σ1 can be reduced, improving the external force, the rigidity against That Riyoko load from a radial direction,
The strength is further increased.

FIG. 5 shows the means for manufacturing the load receiving member 1A. That is, the fixed shaft 7 and the adhesive application device 8 are installed so as to be relatively movable in the axial direction of the fixed shaft 7. To manufacture the load receiving member 1A, first, a belt (not shown) is driven to rotate, and the inner reinforcing member 4 is spirally wound around the fixed shaft 7 without gluing. The reinforcing member 4 is formed by, for example, stacking a plurality of sheets made of the same type of paper as the liner 2b.

Subsequently, the long corrugated cardboard 2 is shifted from the winding pitch P of the reinforcing member 4 by a half pitch (1/2) P.
Is spirally wound. At this time, the single-sided cardboard 2
An adhesive is applied to the surface of the corrugated plate 2a by the adhesive applying device 8. After winding the single face corrugated layer 3 ₁ of the first layer, the second layer after the single-faced corrugated board layer 3 ₂ ~ shown in FIG. 2
3 ₆ , and the outermost single-sided cardboard layer 3 ₆
Is spirally wound around the outer periphery of. The outer reinforcing member 5 is also formed by winding a sheet of paper material a plurality of times. Then, along the cross section as indicated by the dashed line X,
When cut to an appropriate length, the load receiving member 1A shown in FIGS. 1A and 1B is obtained. The reinforcing members 4 and 5 may be formed by spirally winding a paper material having a width equal to the axial length of the load receiving member 1A, instead of spirally winding the paper material.

The load receiving member 1A is formed by spirally winding a long single-sided cardboard 2 to form a cylindrical single-sided cardboard layer 3 _n.
Is formed, the adhesive application device 8 shown in FIG.
Thereby, it can be manufactured by winding while continuously applying an adhesive. Therefore, productivity is improved. Further, since the load receiving member 1A is made of a single-sided corrugated cardboard 2, a double-faced corrugated cardboard 2 having liners 2b attached to both sides of a corrugated plate 2a.
B (see FIG. 4D), the material is more flexible, so that it can be easily bent and wound along the direction R perpendicular to the ridge line 2d of the corrugated plate 2a shown in FIG. Good workability.

FIG. 6 shows another manufacturing means of the load receiving member 1A. That is, in this figure, the reinforcing member 4 on the inner peripheral side,
A plurality of long single-sided corrugated cardboards 2n and reinforcing members 5 on the outer peripheral side
Is partially polymerized in advance (for example, the half pitch (1/2)
P), which are wound around the fixed shaft 7 parallel to each other. Therefore, the inclination angle θ of the side edge 2e in the single-faced corrugated board layer 3 _n, are identical to one another. It is to be noted that the reinforcing members 4 and 5 may be spirally or spirally wound in a step different from that of the single-sided corrugated cardboard 2 as in the case of the manufacturing method of FIG.

Here, the liner 2 of each single-sided cardboard layer 3 _n
Assuming that the diameter of b is φ _n and the width of the cardboard is P _n , the following expression (1) is satisfied in order for the side edges 2 e of the respective cardboard layers 3 _{n to} contact each other. πφ _n · sin θ = P _n (1)

The diameter φ _n of each single-sided corrugated cardboard layer 3 _n gradually increases toward the outside, so that the corrugated cardboard width P _n
Also grows gradually outward. That is, P
_{6> P 5> P 4>} P 3> has the P _2> P _1. As described above, the load receiving member 1A set to satisfy _Pn + ₁ > _Pn
Since a plurality of cardboard layers 3 _n a can rotate simultaneously wound, is excellent in more manufacturability.

The desired single-sided corrugated cardboard 20 shown in FIG. 3 can be obtained in a desired length in the R direction by successively replenishing the rolled-up material in a roll shape as necessary. It can be formed to a desired length in the axial direction. In this way, the corrugated paper tube can be formed in a desired length in the axial direction, and can be used as a core tube 1B for winding the film 9 or the like as shown in FIG. At this time, since the core tube 1B has high strength against a load in the radial direction (lateral direction), the core tube 1B is not deformed even by the tightening pressure of the film 9.

As shown in FIG. 8, the load receiving member 1A can be used as a hole forming material for forming a hole for inserting a support such as a road sign, a guide rail, and a machine into a road or a floor. . That is, in FIG. 8A, when the ground 31 such as a road or a floor is formed of concrete, the load receiving member 1A is wrapped in a vinyl bag 32 and set at a predetermined location, and then concrete is poured. After the concrete is solidified, a solvent such as water is poured into the bag 32 to soften or dissolve the load receiving member 1A. In this state, when the bag 32 is pulled upward as shown in FIG. 8B, a hole 33 is formed in the ground 31. At this time, since the load receiving member 1A has a high strength against a load in the radial direction (lateral direction) and is not deformed by the pressure of the concrete, the hole 33 having a desired shape can be obtained.

The load receiving member 1 made of cardboard as described above
When A is used, the pore-forming material can be easily softened by the solvent as compared with the case of using a pore-forming material obtained by winding paper in multiple layers, so that the drawing operation becomes easy.

As shown in FIG. 9, a long corrugated paperboard tube 1C can be divided into, for example, two parts on a division surface including the axis thereof, and used as a division body 1Ch having an arc-shaped cross section. . In this case, the corrugated paperboard tube 1C including the two divided bodies 1Ch, 1Ch can be used, for example, as a protection tube that covers and protects the metal shaft 14 from the outside.

The load receiving member 1A is provided with a corrugated plate 2a.
, The long single-sided cardboard 2 is wound with the liner 2b outside, but the long single-sided cardboard 2 may be wound with the corrugated plate 2a outside and the liner 2b inside. In this case, since the corrugated plate 2b of the outermost single-sided corrugated cardboard layer is exposed, it is preferable to bond the outer thick reinforcing material 5 to the surface thereof, but the inner reinforcing material 4 can be omitted.

In the above embodiment, the single-sided cardboard layer 3
_{Although n} is six layers, seven or more layers may be provided, or two to five layers may be provided.

When discarding the pallet 6 shown in FIGS. 4A and 4B using the load receiving member 1A of the above embodiment, the upper plate 6a, the lower plate 6b and the load receiving members 1A, 1B forming the pallet 6 are discarded. By hitting with a hammer, the three can be easily separated. Therefore, the waste is not bulky.

Since the pallet 6 has a structure in which both ends of the load receiving member 1A in the axial direction S are firmly adhered to the upper plate 6a and the lower plate 6b of the pallet 6, when a lateral load is applied. Next, delamination B as shown in FIG.
May occur. The pallet 6A of the embodiment shown in FIGS. 10 and 11 solves this problem.

In FIGS. 10 and 11, the pallet 6A uses the load receiving member 1A of the embodiment shown in FIG. 1A.
e, 1f are adhered to the upper plate 6a and the lower plate 6b,
This configuration is the same as that shown in FIGS. 4A and 4B.

The upper plate 6a and the lower plate 6b in FIG. 10 are formed by laminating two double-sided corrugated cardboards 2A in which two corrugated cardboards each having a liner 2b stuck on both sides of the corrugated plate 2a are laminated to form a total of four corrugated cardboard layers. It has a configuration in which layers are stacked. In FIG. 10, the upper plate 6 a and the lower plate 6 b are connected to the cylindrical load receiving member 1.
The state cut along the center line of A is shown.

As shown in FIG. 11, for example, eight reinforcing holes 43 are formed in the upper plate 6a and the lower plate 6b in an annular manner so as to enter inward from the bonding surface of the load receiving member 1A.
The reinforcing hole 43 is filled with an adhesive filler 44. As the adhesive filler 44, a vinyl acetate-based adhesive, which is a kind of resin-based adhesive, is mixed with a filler that is familiar and dries easily, for example, finely crushed paper chips, sawdust or wood chips. A slightly kneaded mixture is preferably used. The reinforcing hole 43
Is preferably formed in a shape that does not penetrate so as to hold the adhesive filler 44 therein, but the cross-sectional area and depth may be arbitrarily determined, and may be appropriately determined according to the situation.

The load receiving member 1A has the same configuration as that shown in FIGS. 1A, 1B and 2, so that the load receiving member 1A is capable of receiving a load of a load in a cylindrical axial direction. Compressive strength, second moment of area and bending stiffness are extremely large.

Both end faces 1e, 1 of the load receiving member 1A shown in FIG.
f is fixed to the upper plate 6a and the lower plate 6b. This fixation is performed by filling the reinforcing hole 43 with the above-mentioned adhesive filler 44 and then applying an adhesive 46 consisting of only a vinyl acetate adhesive.
The load receiving member 1A is slightly applied to the adhesive 46 that is slightly larger than the bonding area of the end surfaces 1e and 1fb of the load receiving member 1A, that is, slightly larger than the diameter of the end surfaces 1e and 1f. This is done by pressing and bonding the end surfaces 1e and 1f.

As described above, a material obtained by mixing a filler with a vinyl acetate-based adhesive is used as the adhesive filler 44 to be filled in the reinforcing hole 43. This is because it may be recessed from the bonding surface of the receiving member 1A and may not be integrally connected to the adhesive 46 on the end surfaces 1e and 1f of the load receiving member 1A, and may also be poorly dried.

Here, a piece of paper used as a filler is
The single-faced cardboard 2 is cut and then dissolved in a solvent to be dissolved again in the solvent together with the single-sided cardboard 2 during the recycling process of being used as a raw material for the cardboard. Also, sawdust and small pieces of wood used as filler float on the surface of the solvent,
Can be easily eliminated. Therefore, the advantage of excellent cardboard recycling is not impaired.

As the adhesive used for the adhesive filler 44, an adhesive excellent in cardboard bonding strength such as a resin-based adhesive other than a vinyl acetate-based adhesive or a non-resin-based adhesive is appropriately selected and used. However, the same type of adhesive 46 used for bonding the end surfaces 1e and 1f of the load receiving member 1A to the upper plate 6a and the lower plate 6b (for example, both adhesives 44 and 46) can be used.
When both are vinyl acetate-based), this adhesive 46
It is preferable because it is firmly integrated with. Further, the adhesive alone may be used as the adhesive filler 44 without mixing the above filler into the adhesive.

The pallet 6A of this embodiment has the reinforcing holes 43
The adhesive filler 44 solidified in the end face 1 of the load receiving member 1A
e and 1f are integrally connected to the adhesive 46,
Even if a large lateral load is applied to the load receiving member 1A from the side in the radial direction of the cylindrical shape, the adhesive filler 44 acts to resist the lateral load and prevent delamination due to the lateral load. The prying force due to the load is dispersed and received by the upper plate 6a and the lower plate 6b via the adhesive filler 44. Therefore, the load receiving members 1 in the upper plate 6a and the lower plate 6b
Since the lateral load is not intensively applied to the portions joined to the end surfaces 1e and 1f of A, the end surfaces 1 of the upper plate 6a and the lower plate 6b
The occurrence of interlayer delamination in the liner 2b joined to e and 1f is prevented. In fact, the lateral load at which delamination occurs is
As compared with the case where the reinforcing hole 43 was not provided with the structure in which the adhesive filler 44 was filled, the number reached 5 times.

In this embodiment, the load receiving member 1A
Since the adhesive 46 for bonding the end surfaces 1e and 1f is applied to be larger than the diameter of the end surfaces 1e and 1f, when the end surfaces 1e and 1f are pressed against the adhesive 46, the adhesive 46 is applied. Are attached to the outer peripheral surface near the end surfaces 1e and 1f so as to swell as shown in FIG. As a result, the joining strength between the load receiving member 1A and the upper plate 6a and the lower plate 6b is greatly improved. Also, by bonding the reinforcing member 5 formed by winding thick paper around the outer periphery of the load receiving member 1A, the load receiving member 1 is damaged by a side impact caused by a lifting claw of a forklift. Can be prevented.

Note that the load receiving members 1A and 1B of the above embodiment are used.
Can also be used for things other than pallets, such as simple chairs and storage box legs. In that case, the load receiving member 1A,
1B is used to receive a compressive load in the axial direction of the cylindrical shape.

[0058]

As described above, according to the present invention, the present invention is lightweight, has excellent strength against an axial compressive load, excellent moment of inertia and bending rigidity, and has high productivity and excellent recyclability. A corrugated paper tube and a pallet using the same are obtained.

[Brief description of the drawings]

1A is a side view showing a corrugated paper tube according to an embodiment of the present invention, FIG. 1B is a plan view showing the corrugated paper tube, and FIG. It is sectional drawing which shows a cardboard.

FIG. 2 is a perspective view showing the corrugated cardboard tube partially broken away.

FIG. 3 is a partially cutaway plan view showing a material of a single-sided cardboard used for the cardboard paper tube.

4A is a side view showing a pallet using the corrugated cardboard paper tube, FIG. 4B is a plan sectional view showing the pallet from which the upper plate has been removed, and FIG. 4C is an upper plate and a lower plate of the pallet. Sectional drawing which shows the double-sided corrugated cardboard which is an example of the material of a board, (D)
FIG. 3 is a cross-sectional view showing a double-sided cardboard as an example of a material of the upper plate and the lower plate of the pallet, and FIG.

FIG. 5 is a plan view showing an example of a method for manufacturing the same cardboard paper tube.

FIG. 6 is a plan view showing another method of manufacturing the corrugated cardboard tube.

FIG. 7 is a perspective view showing an example of using the corrugated paper tube of the present invention.

FIG. 8A is a longitudinal sectional view showing another example of use of the corrugated paperboard tube, and FIG. 8B is a longitudinal sectional view showing an operation process in the example of use.

FIG. 9 is a perspective view showing still another usage example of the corrugated paperboard tube.

FIG. 10 is a partially cut-away side view showing a pallet according to an embodiment of the present invention in which delamination is prevented.

11 is a sectional view taken along line XI-XI in FIG.

FIG. 12 is a longitudinal sectional view showing a conventional pallet using cardboard.

[Explanation of symbols]

1A, 1B, 1C: Corrugated paper tube, 2: Single-sided cardboard,
2a: corrugated plate, 2b: liner, _3n : single-sided cardboard layer,
4, 5 ... reinforcement material, 6 ... pallet, 6a ... upper plate, 6b ... lower plate.

Claims (7)

(57) [Claims] An elongated single-sided corrugated cardboard having a liner fixed to one surface of a corrugated plate is spirally wound while being bent along a direction perpendicular to the ridgeline of the corrugated plate to form a cylindrical single-sided cardboard layer. the single-faced corrugated board layer is laminated are fixed a plurality of layers to each other in the radial direction, the longitudinal direction of the single face corrugated elongate in each single face corrugated layer
Side edges along the direction do not overlap and are separated from each other
Not nearly in contact with the corrugated paper tube. 2. The elongate single-sided step board according to claim 1,
The corrugated plate is radially inward and the liner is radially outward.
Corrugated paper wound so that it is located on each side
tube. 3. The innermost part according to claim 1, wherein
Inside surface of single-sided cardboard layer and outermost single-sided cardboard layer
At least one of the outer surfaces of the
Corrugated paper tube. 4. The reinforcing material according to claim 3, wherein the reinforcing material is a paper material.
Corrugated sheet made by winding a sheet of
Paper core. 5. The method according to claim 1, wherein
The ridge line of the corrugated plate of the single-sided cardboard layer is the axis of the cylindrical paper tube.
Corrugated paper tube inclined to the line. 6. A stage according to claim 1,
Both ends of the cylindrical shape of the cardboard tube in the axial direction are on the pallet.
The corrugated paper tube is fixed to the plate and the lower plate,
Pallet installed between lower plates. 7. The upper plate and the lower plate according to claim 6,
Is a pallet made of cardboard.