KR0179316B1 - High density and strength expandable polystyrene pallet and method thereof - Google Patents

Abstract

The EPS having high density and high strength of the present invention has an air pipe connected to the steam supply pipe to maintain the temperature of steam used in the foaming process for foaming polystyrene beads at 90 to 100 ° C Maintaining the steam temperature in the chamber at 90 to 100 deg. C to foam polystyrene beads, maintaining the aging time after the foaming process for 40 to 60 hours, and controlling the steam supplied in the molding process to 0.6 To 0.8 kg / cm < ² > so as to have a density of 25 to 50 kg / m < ³ > and a compressive strength of 1.25 to 2.54 kg / cm < ² >. The pallet of the present invention is formed in accordance with the above-described method using the EPS manufactured according to the above-described method. In general, a plurality of legs are formed, and a groove structure in which legs of forklifts can be inserted in the horizontal and vertical directions And a surface convex and concave portion for coupling with the cushioning packing material is formed on the upper surface thereof.

Description

A foamed styrene pallet having high density and high strength and a method for producing the same

FIG. 1 is a plan view of a pallet of one embodiment made of foamed styrene having high density and high strength according to the present invention.

FIG. 2 is a cross-sectional view taken along line A-A 'of the pallet of FIG.

3 is a cross-sectional view taken along line B-B 'of the pallet of FIG. 1;

FIG. 4 is a plan view of a pallet of another embodiment made of expanded styrene with high density and high strength according to the present invention.

5 is a cross-sectional view taken along line A-A 'of the pallet of FIG. 4;

6 is a cross-sectional view taken along line B-B 'of the pallet of FIG. 4;

DESCRIPTION OF THE REFERENCE NUMERALS

1,2,3,7,8: Pallet bridge 4,5,6,9,10: Bridge overhome

11, 12, 13, 14: Forklift leg insertion slot 21: Upper surface convex portion

22: upper surface concave portion 31, 32, 33, 51, 52: pallet leg

34, 35, 33, 51, 52: leg upper grooves 61, 62, 63, 64: forklift leg groove

40, 41: upper surface concave portion

[0001]

The present invention relates to an expandable polystyrene (EP) having high density and high strength,

S) and a method for producing the pallet. More particularly, the present invention relates to a pallet made of foamed styrene having a density of 25 to 50 kg / m < ³ > and a compressive strength of 1.25 to 2.54 kg / cm < ² >

BACKGROUND OF THE INVENTION [

Foamed styrene, commonly referred to as styropol, is widely used as a cushioning packaging material. That is, the cushioning packaging material generally serves to safely package various products including electrical and electronic products. Such foamed styrene is manufactured to have a density and strength sufficient to package the product. Generally, a foamed packaging material made of foamed styrene is produced by foaming from styrene beads, followed by aging to form various packaging materials, and such techniques are already widely used in this field. However, the conventional foamed styrene has a density in the range of 15 to 25 kg / m < ³ >, and the compression strength when compressed to 4% without breakage is in the range of 0.76 to 1.27 kg / cm < ² >. Foamed styrene having such a range of density and compressive strength can not be applied to products requiring high compressive strength. Conventional foamed styrene could not be applied especially when producing a pallet having a large load. In the present invention, it is possible to produce foamed styrene having high density and high strength which can be applied to a case where a high load such as a pallet is required.

Conventional pallets have conventionally been manufactured using wood. Such a conventional pallet has a difficulty in providing a separate treatment system for recycling and waste treatment, and in the case of a product sensitive to moisture, the moisture content of the wood may change depending on the surrounding environment, resulting in damage to the product, There is a disadvantage in that the pallet is heavy in weight and thus the working efficiency is lowered so that there is a problem that when the pallet is loaded with the packing material on a pallet made of wood and transported using a forklift, the pallet and the packing material stacked thereon may be displaced .

In general, pallets are used at the bottom to transport and load products into containers. The pallets are packed in a cushioning packing material conforming to various product standards, and the forklift legs are inserted at the bottom of the pallet for transportation and loading. EPS is most widely used as a cushioning packaging material, and its recycling system is well-equipped around the world. However, because pallet is made of wood up to now, it is necessary to have a different recycling system from EPS. Therefore, when a pallet is manufactured using EPS, which is the same material as the cushioning packaging material, there is no need for a recycling system in which a pallet made of wood is separately treated. That is, the additional cost of separately processing the pallet made of wood can be saved. In addition, the pallet made of wood is not preferable from the environmental point of view, and when the pallet is used as the EPS, the same material as the cushioning material, it contributes to environmental protection.

Conventional wooden pallets can contain up to 30% moisture and are sensitive to ambient temperature and humidity, while EPS materials are hardly affected by temperature and humidity because the moisture content is balanced to about 1% . Therefore, when the pallet is manufactured by EPS, it is possible to completely eliminate the damage or defects of the product due to moisture absorption.

Since the conventional pallet is made of wood, its weight is heavy, the working efficiency is lowered, there is a fear of damaging the operator because there is no buffering property, and a separate cleaning work for preventing insects and mold caused by moisture However, a pallet made of EPS can eliminate such a problem.

In order to eliminate the problem of the conventional pallet made of wood, the inventors of the present invention have developed an EPS having high density and high strength and developed the present invention for manufacturing a pallet using the same.

[Object of the invention]

It is an object of the present invention to provide a pallet made of high density and high strength EPS.

Another object of the present invention is to provide an EPS material pallet which is made of the same material as the cushioning material made of EPS and does not require a separate recycling system.

Another object of the present invention is to provide an EPS material pallet which is not affected by ambient temperature or humidity and does not cause damage or defects of the product.

Another object of the present invention is to provide a lightweight and buffering EPS material pallet having a weight of about 1/4 of that of wood.

Another object of the present invention is to provide an EPS material pallet which is excellent in environmental aspects and cost because it is not corrosive and does not require a work for controlling insects and fungi.

Another object of the present invention is to provide an EPS material pallet having a uniform cost and a reduced manufacturing cost since a standard product can be mass-produced by a mold.

It is a further object of the present invention to provide a method of manufacturing a pallet, comprising the steps of: forming a concavo-convex groove on a surface of a pallet and a cushioning packing material placed thereon, To provide a pallet that can be safely transported or stored.

The above objects and other advantages can be clearly realized by the pallet of the present invention described below.

[Summary of the Invention]

The EPS having high density and high strength of the present invention has an air pipe connected to the steam supply pipe to maintain the temperature of steam used in the foaming process for foaming polystyrene beads at 90 to 100 ° C Maintaining the steam temperature in the chamber at 90 to 100 deg. C to foam polystyrene beads, maintaining the aging time after the foaming process for 40 to 60 hours, and controlling the steam supplied in the molding process to 0.6 To 0.8 kg / cm < ² > so as to have a density of 25 to 50 kg / m < ³ > and a compressive strength of 1.25 to 2.54 kg / cm < ² >.

The pallet of the present invention is formed in accordance with the above-described method using the EPS manufactured according to the above-described method. In general, a plurality of legs are formed, and a groove structure in which legs of forklifts can be inserted in the horizontal and vertical directions And a surface convex and concave portion for coupling with the cushioning packing material is formed on the upper surface thereof.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION OF THE INVENTION

The EPS having high density and high strength according to the present invention is broadly classified into a foaming process for foaming polystyrene beads, a maturing process for aging foamed polystyrene, and a molding process for molding products with aged foamed polystyrene. Such a process can be easily understood by those skilled in the art. However, in the present invention, a process for producing EPS having a density of 25 to 50 kg / m ³ and a compressive strength of 1.25 to 2.54 kg / cm ² has been developed in order to produce EPS products requiring high compressive strength such as Pallet It is.

In conventional EPS, the temperature of the steam used in the foaming process is usually 110 to 110 ° C. However, in order to obtain the EPS product of the present invention, it was necessary to maintain the temperature of the steam at 90 to 100 캜. For this purpose, an air pipe is connected to the supply pipe of steam supplied to the foaming process. In order to obtain an EPS having a high density, that is, a low expansion ratio, a low temperature heating medium is required, and steam mixed with air is supplied to maintain the temperature of the steam below 100 ° C.

After the foaming process, the aging process is performed. Conventional EPS generally underwent an aging process for 5 to 40 hours, but in order to produce EPS of high density and high strength of the present invention, the aging process was performed for 40 to 60 hours. This is because it is necessary to continue the aging until the gas concentration of the appropriate level is lowered in order to improve the productivity and stabilize the quality in the post-forming molding process, since the high density foaming lip contains high gas concentration. In this case, Of the aging time is 40 to 60 hours. The EPS that has undergone the aging process performs the molding process according to the product. During the molding, steam is supplied. In this case, the pressure of steam is usually 0.8 to 1.1 kg / cm ^{2 in the} case of a conventional EPS product. However, in the present invention, the steam pressure to be supplied at the time of molding should be kept as low as 0.6 to 0.8 kg / cm ² . This is because when high-density and high-strength EPS products are molded, high-pressure steam lowers the meltability and productivity and, as a result, increases the defect rate. Therefore, in order to produce an EPS molded article having a high density and a high strength such as a pallet, it has been found that the steam pressure supplied during molding is 0.6 to 0.8 kg / cm ² .

An EPS molded article having a density of 25 to 50 kg / m < ³ > and a compressive strength of 1.25 to 2.54 kg / cm < ² >

FIG. 1 is a plan view of a pallet of one embodiment of a high density and high strength EPS molded article according to the present invention, FIG. 2 is a cross-sectional view taken along the line A-A 'of the pallet of FIG. 1, Sectional view taken along line B-B 'of FIG.

The pallet of FIG. 1 is an ordinary standard having a width of 1140 mm and a length of 1310 mm. In the lower portion thereof, there are formed nine pallet legs including a plurality of pallet legs (1,2,3,7,8) 12, 13, and 14 into which the forklift legs can be inserted. On the upper surface of the pallet, an upper surface convex portion 21 and an upper surface concave portion 22 are formed along the circular shape at 90 Deg.]. The upper surface concave and convex portions 21 and 22 have a structure to be coupled with the convex and concave portions formed below the shock-absorbing packaging material (not shown) placed on the pallet. Therefore, the pallet and the cushioning packaging material have the effect of being firmly coupled with each other during transportation without mutual deviation.

In the pallet of the present invention, the area of each of the nine pallet legs is 3,350 cm ² . The pallet produced according to the method of the present invention exhibited a compressive strength of 2.03 kg / cm ² at a density of 40 kg / m ³ when EPS was compressed without being damaged. In this case, the load that can be loaded on the pallet is 2.03 kg / cm ² × 3, 350 cm ² = 6,800 kg. Also, when 1.25 to 2.54 kg / cm ² , which is the range of compressive strength in the present invention, is applied, the loading load of the pallet in the present invention is 4,188 to 8,509 kg, so that a sufficient loading load as the pallet can be maintained.

FIG. 4 is a plan view of a pallet, which is another embodiment of an EPS molded article having high density and high strength according to the present invention, FIG. 5 is a sectional view taken along the line A-A 'of the pallet of FIG. 4, Sectional view taken along line B-B 'of FIG.

In the lower part of the pallet in FIG. 4, nine pallet legs are formed as well as a plurality of pallet legs 31, 32, 33, 51 and 52 as shown in the lower part of the pallet of FIG. 1, Insertion grooves 61, 62, 63, and 64 are formed. Upper grooves (34, 35, 36, 53, 54) are formed in the upper part of the pallet legs. Two upper surfaces of the upper surface concave portions 40 And the upper surface concave portions 40 and 41 have a structure to be coupled with a convex portion (not shown) formed under the cushioning packing material (not shown) placed on the pallet. Therefore, the pallet and the cushioning packaging material have the effect of being firmly coupled with each other during transportation without mutual deviation.

The pallet shown in Figs. 4 to 6 can also maintain a load such as the pallet shown in Figs. 1 to 3.

The present invention can provide an EPS having a high density and a high strength for forming a product requiring high compressive strength including a pallet, and a method of manufacturing a pallet using the same material as that of the shock- There is no need of a recycling system, and damage to the product can be prevented by being unaffected by the temperature and humidity, and it is possible to improve the working efficiency by reducing the weight, and the manufacturing cost can be reduced.

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.

Claims (3)

A method for manufacturing a foamed styrene pallet comprising the steps of: connecting an air pipe to a steam supply pipe to maintain the temperature of steam in the chamber at 90 to 100 ° C to foam polystyrene beads; Aging the foamed styrene having completed the foaming process for 40 to 60 hours; And forming a foamed styrene pallet by maintaining the pressure of steam supplied to the molding process at 0.6 to 0.8 kg / cm ² , wherein the foamed styrene pallet has a density of 25 to 50 kg / m ³ and a pressure of 1.25 to 2.54 kg lt; ² > / cm < ² >. A plurality of pallet legs (1, 2, 3, 7, 8) are formed, insertion grooves (11, 12, 13, 14) into which legs of a forklift can be inserted are formed between the legs and the legs, On the upper surface of the pallet, an upper surface convex portion (21) and an upper surface concave portion (22) are formed in the upper part of the legs Wherein the foamed styrene pallet is formed by alternating angles, and is manufactured according to the method of claim 1. The pallet legs 31, 32, 33, 51 and 52 are formed, and insertion grooves 61, 62, 63 and 64, into which the legs of the forklift can be inserted, are formed between the legs and the legs, Upper leg grooves 34, 35, 36, 53 and 54 are formed at the upper part of the legs, respectively, and upper surfaces of the pallets are provided with two quadrangular upper surface recesses 40, 41 Wherein the foamed styrene pallet is formed according to the method of claim 1.