WO2015182805A1

WO2015182805A1 - Pallet made of synthetic resin

Info

Publication number: WO2015182805A1
Application number: PCT/KR2014/005014
Authority: WO
Inventors: 윤항노
Original assignee: 윤항노
Priority date: 2014-05-30
Filing date: 2014-06-05
Publication date: 2015-12-03
Also published as: KR101518755B1

Abstract

The purpose of the present invention is to provide a pallet made of synthetic resin which is advantageous in terms of weight reduction, and which is capable of sufficiently securing structural strength against a load. According to the present invention, an upper plate (10) is formed from a single sheet of synthetic resin, shaped concavely downwards on the horizontal plane of the top portion thereof, and is equipped with: upper air pockets (12) formed continuously on the same plane; a lower air pocket (14) formed between the upper air pockets (12) on a lower part of the horizontal plane between the upper air pockets (12); and a border part of the plane. Also, a lower plate (20) is equipped with: an upper surface (22) which forms a horizontal plane; a number of legs (30) extended downwards while forming an air room (32) shaped concavely downwards on the upper surface thereof; and a border part of the plane. The upper surface of the lower plate is integrally fixed in contact with the lower surface of the upper air pocket forming the horizontal surface, and the lower air pocket and the air room are maintained in an air-tight state with respect to the outside, with the upper plate and the lower plate combined by integrally fixing each border part of the upper plate and the lower plate to each other. In addition, a core made of Styrofoam may be mounted to the air room.

Description

Synthetic resin pallet

The present invention relates to a pallet made of a synthetic resin material, and more particularly, to a pallet made of a synthetic resin material so as to have a minimum weight and a sufficient rigidity so that the weight of the logistics can be reduced.

In general, a pallet can be said to be used to be carried with a product by a fork of a folklift while the product is loaded thereon. These pallets are generally transported with products manufactured in various industrial fields.

Such a pallet has traditionally been made of wood, but the demand for durability in light of the problem of insect pests, long-term use, and the need for lighter weight are constantly being raised. For example, Korean Patent Application No. 20-2004-0017264 discloses a pallet capable of minimizing the volume of the external shape, but it can be said that consideration of rigidity and weight is insufficient.

According to Korean Patent Application No. 20-2000-0023326, a pallet using a synthetic resin material instead of wood has been proposed, but this has a disadvantage in that it also has a certain limit in terms of strength and weight. Korean Patent Application No. 10-2007-0066709 proposes a pallet made of corrugated cardboard in consideration of its weight, but it is disadvantageous that the pallet made of corrugated cardboard is not only weak in moisture but also unsatisfactory in terms of strength to be.

The pallet, which is mounted on the transportation apparatus with various products loaded, may have properties required in various aspects. For example, when a product is transported by an airplane or ship, curing is required in terms of load. It is also true that robustness and durability are required to adequately protect the product during transportation, including transportation in forklifts. In addition, moisture resistance to moisture may also be required for changes in the environment during transportation.

The main object of the present invention is to provide a pallet made of a synthetic resin having a light weight and a sufficient strength so as to be able to meet various requirements required in the pallet.

It is another object of the present invention to provide a synthetic resin pallet capable of supporting an article while elastically absorbing a load of the article to be stacked thereon.

According to an aspect of the present invention, there is provided a pallet comprising: an upper air pocket formed in a sheet of synthetic resin material, formed in a concave shape downward from a horizontal plane on an upper side and continuously formed on the same plane; A lower air pocket formed between the upper air pocket and the lower horizontal plane, and a planar rim portion; A lower plate having a top surface defining a horizontal plane, a plurality of legs extending downwardly forming an air chamber recessed downwardly from the top surface, and a planar rim portion; The upper surface of the lower plate is integrated and fixed in a state where the rim portions are in contact with each other so that the upper surface of the lower plate is integrally fixed in contact with the bottom surface of the upper air pocket forming the horizontal surface, Wherein the lower air pocket and the air chamber are held in a hermetic state with respect to the outside.

According to an embodiment of the present invention, the upper air pocket is formed in a honeycomb shape in cross section so that it can have sufficient structural strength.

According to another aspect of the present invention, there is further provided a core inserted into the air chamber and formed of a foam which is in close contact with the inner surface of the air body.

According to another embodiment of the present invention, the inner side surface of the upper air pocket is formed so as to be inclined outward from the bottom surface of the air pocket, and is more advantageously dispersed in the load of the article to be stacked on the pallet .

According to another embodiment of the present invention, the reinforcing rib structure in which the up-down mountain portion and the valley portion are continuous in the left-right direction is formed on the outer side surface of the leg, thereby further reinforcing the structural strength against the load placed on the pallet .

The legs are preferably formed in a square pillar shape.

At least a part of the bottom surface of the upper air pocket and the corresponding part of the upper surface of the lower plate, and the rim of the upper plate and the lower plate can be closely fixed by ultrasonic welding. Or at least a part of the bottom surface of the upper air pocket and the corresponding part of the upper surface of the lower plate are closely contacted and fixed by thermal fusion and the edge portions of the upper and lower plates are firmly fixed by ultrasonic welding.

It can be seen that the present invention is designed to have sufficient strength while being hollow by the air pockets formed between the upper and lower plates by the combination of the upper plate and the lower plate. In addition to this structure, it can be seen that the legs are also formed in an empty shape to achieve an optimized weight reduction in the overall pallet. In addition, through the weight reduction, it is expected that the cost of logistics can be sufficiently reduced due to the weight reduction of the pallet itself when the product is transported.

According to the present invention, the structure of the upper plate having a plurality of air pockets, more specifically, the upper plate formed in a honeycomb shape, can sufficiently secure the strength of the upper plate itself. It is obvious that the upper plate according to the present invention has a sufficient supporting force even with respect to the substantially vertical force, and it is also clear that the upper plate according to the present invention can have a sufficient supporting force against an external force in the horizontal direction. Further, according to the present invention, in addition to the structure of the upper plate as described above, it can be seen that the legs themselves can have sufficient strength by the reinforcing ribs formed in the vertical direction.

Furthermore, according to the present invention, by filling a lightweight foam in the hollow intermediate portion of the leg, it can be understood that the functional effect can be sufficiently improved in structure and strength without applying substantial weight.

1 is an exploded perspective view of a pallet of a preferred embodiment of the present invention;

Figure 2 is a perspective view of the pallet in a coupled state of a preferred embodiment of the present invention;

3 is a cross-sectional view taken along line A-A in Fig.

Figure 4 is a plan view of the enlarged view of Figure 2;

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings.

As shown in Fig. 1, the pallet of the present invention is composed of an upper plate 10 having a predetermined rectangular shape and a lower plate 20 adhered and fixed to the bottom surface of the upper plate 10. As shown in Fig. The upper plate 10 and the lower plate 20 are formed of a synthetic resin material and may be formed of, for example, PP (polypropylene) resin or ABS (acrylonitrile butadiene styrene) resin. It is a matter of course that molding can be performed using other synthetic resins other than PP or ABS. Since the upper plate 10 and the lower plate 20 are completely adhered and fixed to each other, it is preferable that the upper plate 10 and the lower plate 20 are formed of synthetic resin of the same material whenever possible.

The upper plate 10 and the lower plate 20 can be fixed to each other by various methods within a range where they can be integrated with each other. It is also possible to adhere the upper plate 10 and the lower plate 20 by using an adhesive agent and completely integrate the upper plate 10 and the lower plate 20 by ultrasonic welding and the upper plate 10 ) And the lower plate 20 can be fused to each other and integrated.

2 and 3, a honeycomb-shaped upper air pocket 12 having an open upper end is recessed downward on the upper surface, that is, the horizontal surface 16 of the upper plate 10, . And the upper air pocket 12 is continuously formed on the entire upper surface of the upper plate 10. [ That is, the upper air pocket 12 is formed so as to be continuous on the same plane without being spaced apart in the X-axis direction and the Y-axis direction. The air pocket 12 is formed so that the upper portion thereof is opened so that the air pocket 12 can have a constant height and light weight.

In the illustrated embodiment, the upper air pocket 12 has a honeycomb shape in cross section, and the present invention is not limited to this honeycomb shape. For example, it is of course possible to form the upper air pocket 12 into an air pocket having a horizontal cross section such as a square, pentagon, or circle. However, it is considered to be most preferable to form the upper air pocket 12 having a honeycomb-shaped cross section as shown in the structural and strength views.

The upper plate 10 is formed by injection molding a synthetic resin material. In particular, it is preferable that the plate material is made by adhering a sheet of synthetic resin material to a mold by a vacuum adsorption method. As shown in the enlarged view of FIG. 3, the upper air pocket 12 is formed on the upper surface of the upper plate 10, so that the upper air pocket 12 is formed on the upper surface of the upper plate 10, And the lower air pocket 14 corresponding to the lower surface of the upper surface 10 is also formed.

That is, the lower air pocket 14 is formed below the horizontal plane 16 between the upper plate 10 and the upper air pockets 12. This lower air pocket 14 may be said to be molded in a corresponding shape between the upper air pockets 12 which are continuously formed in the plane and the lower air pockets 14, Are communicating with each other. It will be appreciated that the top plate 10 of the present invention is thus formed from a sheet of synthetic resin material, with an upper air pocket 12 at the top and a lower air pocket 14 at the bottom. And the lower air pockets 14 are connected so as to communicate with each other as described above.

As in the illustrated embodiment, a honeycomb-shaped upper air pocket 12 is formed and a lower air pocket 14 is formed between the upper air pockets 12 at a lower portion. With this configuration, (10) itself is sufficiently secured. For example, the upper plate 10 can have a sufficient supporting force not only for the external force applied in the horizontal direction but also for the external force applied in the vertical direction. With this structure, it is possible to prevent the edge portion from being sagged downward even when the upper plate 10 is lifted. The upper air pocket 14 and the lower air pocket 14 as well as the structure of the upper air pocket 14 itself by adhesion with the lower plate 14, The air layer contributes to structural strength reinforcement, which will be described later.

The upper plate 10 having such a configuration is fixed in close contact with the lower plate 20 and is fixed to the bottom surface 18 of the upper air pocket 12 by ultrasonic welding using heat, The upper surface 22 of the lower plate 20 is partially adhered and the edge portions of the upper plate 10 and the lower plate 20 are completely tightly contacted to fix the lower air pocket 14 to the airtight state.

The lower plate 20 has the same area as the upper plate 10 and has an upper surface 22 forming a plane and a plurality of legs 30 extending downward. The lower plate 20 is also formed by vacuum-adsorbing a sheet of a synthetic resin sheet to a mold as described above. Thus, the air chamber 32 is formed on the upper portion of the plurality of legs 30 extending downward from the upper surface 22. With this structure, the lower plate 20 can be substantially lightened as much as possible, and at the same time, it can be combined with the upper plate 10 to ensure sufficient structural strength as a whole.

The side surface of the leg 30 is not formed in a plane but has a reinforcing rib structure in which the mountain portion 34 and the valley portion 36 are repeated in the vertical direction. It should be understood that the legs 30 in the illustrated embodiment have a square pillar shape but are not limited thereto and may be formed of cylindrical or other polygonal columns. As shown in the figure, even when the legs 30 are formed into a shape other than a quadrangular prism, it is also possible to realize a reinforcing rib shape repeated in the left and right directions while intersecting the vertex mountain portion 34 and the valley portion 36 desirable. As another embodiment for each side of the legs 30, there is a reinforcing rib which is formed concavely or convexly in the up-and-down direction with respect to the planar sidewall, as in a rectangular pillar.

The legs 30 are formed to extend downwardly from the lower plate 20 and form a predetermined space with respect to the ground or bottom surface so that the fork of the forklift can be inserted therebetween. As in the illustrated embodiment, the legs 30 are preferably formed of nine arranged in the transverse and longitudinal directions, but are not limited by the number of legs 30.

Flat plate portions

10m and 20m are formed along the edge portions of the upper plate 10 and the lower plate 20, respectively. The upper and

lower plates

10 and 20 are closely contacted with and fixed to each other at the

rim portions

10m and 20m so that the lower air pocket 14 can be kept in a hermetic state with respect to the outside.

Next, a structure in which the upper plate 10 and the lower plate 20 are coupled with each other will be described with reference to FIG. Basically, the upper plate 10 and the lower plate 20 are adhered to each other by an adhesive means, at which time the lower air pocket 14 should be glued to the outside. 3 and 4, a description will be given of a method of bonding the upper plate 10 and the lower plate 20 according to a preferred embodiment of the present invention.

3, the bottom surface 18 of the upper air pocket of the top plate 10 and the top surface 22 of the bottom plate 20 are adhered and fixed by ultrasonic welding . As described above, the upper and

lower plates

10 and 20 are bonded to each other by ultrasonic welding in an airtight state with respect to the outside. 4, at least a part of the bottom surface 18 of the upper air pocket 12 and a part of the upper surface 22 of the lower plate 20 are ultrasonically fused so that the first fused portion Fa . That is, the first fused portion Fa can be said to indicate a portion where the bottom surface 18 and the top surface 22 described above are fused together by ultrasonic waves. Such a first fused portion Fa is preferably applied to the bottom surface 18 of substantially all of the upper air pockets 14 but may also be implemented except for the bottom surface 18 of some of the upper air pockets 14 will be.

A second fused portion Fb is formed in the

rim portions

10m and 20m of the upper plate 10 and the lower plate 20. [ A second fused portion Fb to which the upper plate 10 and the lower plate 20 are ultrasonic welded is formed with respect to the entire edge portion so as to surround all the rim portions of the upper plate 10 and the lower plate 20. [ Since the second fused portion Fb is formed at the entire rim portion, the lower air pocket 14 described above by the second fused portion Fb is formed in a hermetic state with respect to the outside. Also, the air chamber 32 formed inside the upper portion of the leg 30 of the lower plate 20 is also hermetically sealed to the outside.

As shown in FIG. 4, it is a matter of course that the upper plate 10 and the lower plate 20 are provided with the

rim portions

10m and 20m. When the

rim portions

10m and 20m are closely fixed to each other, So that the lower air pocket 14 and the air chamber 32 therein are kept substantially airtight with respect to the outside. The lower surface 18 of the upper air pocket 12 and the upper surface 22 of the lower plate 20 are brought into close contact with each other so as to fix the

rim portions

10m and 20m to each other in addition to the above- It is a matter of course that there may be other embodiments in the fixing portion.

The upper plate 10 and the lower plate 20 can be brought into close contact with each other by integrating the portions of the upper plate 10 and the lower plate 20 that are in close contact with each other by heat welding to apply heat and pressure at the same time. It is also possible to integrate the upper plate 10 and the lower plate 20 by using the above-described portions of the upper plate 10 and the lower plate 20 that are in close contact with each other at the same time by ultrasonic welding and thermal welding. For example, the first fused portion Fa mentioned above is bonded to the upper plate 10 and the lower plate 20 by thermal fusion and the second fused portion Fb is bonded to the lower plate 20 of the upper plate 10 by ultrasonic welding, It is also possible to adhere them to one another.

The lower air pocket 14 and the air chamber 32 are in a sealed state so that the lower air pocket 14 and the upper air pocket 14 are sealed, The air room 32 will provide a structure that substantially achieves the light weight of the pallet of the present invention, while still securing sufficient structural strength.

As described above, when the upper plate 10 and the lower plate 20 are closely contacted and fixed, the lower air pocket 14 and the air chamber 32 between them are hermetically sealed to the outside. That is, it is a matter of course that the air layer contained in the lower air pocket 14, which communicates as a whole, has a certain supporting force against an external force externally applied. Further, when air is further injected into the lower air pocket 14, an air layer having a high pressure will be formed substantially inside the lower air pocket 14, and thus it is expected that a stronger supporting force will be exerted to the outside do. In addition, the air layer formed by the lower air pocket 14 and the air chamber 30 thus provides a predetermined elasticity. In addition to the elasticity of the synthetic resin forming the upper plate 10, It is natural that the cushioning force not only improves the shock absorbing force but also the damage to the pallet as a whole can be further prevented.

According to another embodiment of the present invention, a core 40 made of a foam can be inserted into the air chamber 32 formed on the upper portion of the leg 30 of the lower plate 20, . Here, foam refers to foam foam of styrofoam or various other types, and it can be said to have a light weight and a certain degree of rigidity. When the upper plate 10 and the lower plate 20 are bonded and fixed in this state, the core 40 made of such a foam is inserted into the air chamber 32. In this state, (10) and the lower plate (20).

Therefore, the strength of the foam itself forming the core 40, while being wrapped by the upper and

lower plates

10 and 20 having the constant strength, It can be further reinforced. It is obvious that the core 40 is substantially in surface contact with the upper plate 10 and the lower plate 20 so that stress concentration does not occur and thus it is possible to enhance the strength of the pallet as a whole have.

In the illustrated embodiment, since the legs 30 are formed in a rectangular pillar shape as a whole, the core 40 is also formed to have a hexahedral shape as a whole. It is sufficient, however, that the core 40 be inserted into the air chamber 32 through the open upper portion of the leg 30 so that it can be brought into close contact with the side surface 12a and the bottom surface 12b of the leg 30 at the outer side It can be said that the core 40 is formed in a shape corresponding to the air chamber 32 of the leg 30 and can be supported while being in contact with the inner surface of the air chamber 32 as a whole.

When the core 40 is formed in a hexahedron shape as in the illustrated embodiment, the inner surface 32a of the air chamber 32 is formed so as to be inclined outwardly toward the bottom surface 32b desirable. That is, it is preferable that the angle? Formed by the inner surface 32a and the bottom surface 32b of the air chamber 30 is slightly larger than the right angle, for example, 92 to 95 degrees. The angle? Is an angle formed by the inner surface 32a and the bottom surface 32b and is an angle formed by the outer surface 32c of the leg 30 and the bottom surface of the lower plate 20 , As shown in Fig.

Since the core 40 should be formed in a shape corresponding to the air chamber 30, the upper portion of the core 40 should be formed to be somewhat larger than the lower portion in the hexahedron. As described above, when the air chamber 32 is formed to have the angle?, It is very convenient to insert the core 40 having the corresponding shape into the air chamber 32, Of course.

Molding the inner side surface 32a or the outer side surface 32c of the air chamber 30 to have a predetermined inclination has the advantage of being convenient for storing the core 40 as described above, ) Is also expected to contribute to the load bearing capacity of the article placed on top of the pallet.

3, it is preferable that the inner side surface 12a of the upper air pocket 12 is also formed so as to have a predetermined inclination angle? Outward toward the upper side with respect to the bottom surface 12b . For example, the inner side surface 12a and the bottom surface 12b may have an angle in the range of 92 to 95 degrees, which is expected to be structurally reinforced.

As described above, the upper plate 10 is molded in a sheet of synthetic resin sheet, and the upper air pockets 12 are continuously formed in all directions on the same plane. Thus, when a load is applied to the outwardly inclined inner side surface 12a as it goes upward from the upper air pocket 12 as described above, this load is applied to the inner side surface 12a and the bottom surface 12b through the horizontal surface 16 And the horizontal surface 16, the inner surface 12a, and the bottom surface 12b which are successively adjacent to each other are dispersed in the X-axis direction and the Y-axis direction.

The reason why the load applied to the inner side surface 12a of the air pocket 12 is dispersed is that the inner side surface 12a having a substantially constant inclination is connected to each other through the bottom surface 12b and the horizontal surface 16, it can be interpreted as constituting a trust structure. And it can be said that the structural strength can be increased as a whole due to the dispersion of the load. As described above, it is needless to say that the outer surface 32c or the inner surface 32a of the leg 30 has a slope as described above.

As described above, in the pallet according to the present invention, the upper plate 10 and the lower plate 20, which are made of the synthetic resin sheet, are integrated and fixed to each other by adhesion or the like, and upper and lower air pockets are formed on the upper plate, It is understood that the basic technical idea is to make it structured so as to have sufficient strength at the same time.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Of course.

Claims

An upper air pocket formed in a sheet of synthetic resin sheet and recessed downwardly in a horizontal plane at the upper side and continuously formed in the same plane, a lower air pocket formed between the upper air pocket and the lower horizontal plane between the upper air pocket, An upper plate having a flat rim portion;

A lower plate having a top surface defining a horizontal plane, a plurality of legs extending downwardly forming an air chamber recessed downwardly from the top surface, and a planar rim portion;

The upper and lower plates are integrally fixed in contact with each other so that the upper surface of the lower plate is in contact with the lower surface of the upper air pocket forming the horizontal surface, Wherein the lower air pocket and the air room are held in an airtight condition against the outside.
The pallet of claim 1, wherein the upper air pocket is formed in a honeycomb shape in cross section.
The pallet of claim 1 or 2, further comprising a core inserted into the air chamber and formed of a foam which is in close contact with an inner surface of the air product.
The pallet of claim 1 or 2, wherein the inner surface of the upper air pocket is formed so as to be inclined outward from the bottom surface of the air pocket.
The pallet of claim 1 or 2, wherein a reinforcing rib structure is formed on an outer side surface of the leg, the reinforcing rib structure having a vertical mountain portion and a valley portion continuous left and right.
7. The pallet of claim 6, wherein the legs are formed in a square pillar shape.
The pallet of claim 1 or 2, wherein at least a part of the bottom surface of the upper air pocket and a corresponding part of the upper surface of the lower plate, and a rim of the upper plate and the lower plate are closely contacted and fixed by ultrasonic welding.
The air pocket according to claim 1 or 2, wherein at least a part of the bottom surface of the upper air pocket and a corresponding part of the upper surface of the lower plate are closely adhered to each other by thermal fusion and the rim portions of the upper and lower plates are closely contacted A synthetic resin as pallet fixed.