KR101550213B1 - Environment-friendly Pallet Using Chaff and Its Manufacturing Method - Google Patents

Abstract

The present invention relates to an environmentally friendly pallet using chaff, and a manufacturing method for the same. The pallet is made by a plurality of chip blocks assembled together, wherein a chip block is made of a mixture of chaff powder with an adhesive to be heated, pressurized, and compressively molded, wherein the adhesive is one among a vinyl acetate adhesive and a synthetic acrylic adhesive. As such, the present invention provides a chip block for a pallet which is easy to manufacture, has excellent strength, and is environmentally friendly.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an environment- friendly pallet using chaff,

The present invention relates to an environmentally friendly pallet using a rice husk and a method of manufacturing the same. More particularly, the present invention relates to a pallet that is used as a pedestal when a freight such as a warehouse or a factory is transported and stored, Which is more environmentally friendly and excellent in rigidity, and a method for producing the same.

When a cargo is transported or stored in a warehouse or a factory, the cargo is mainly carried by a forklift. In this case, a pallet having a hole through which a fork of a forklift is inserted is used. Thus, the cargo can be safely and effectively transported.

The pallet having the above functions is generally manufactured by using wood or plastic. The wooden pallet is weak in strength and is easily broken during the handling process and the cargo transportation process. Moreover, the wood for producing the pallet is mainly used for importing It is subject to quarantine at the time of importation, and heat treatment is also required in the manufacture of pallets, which is costly.

For this reason, plastic pallets are mainly manufactured and used. Recently, such plastic pallets have advantages in that they are not easily broken due to their excellent strength and are easy to manufacture, but they are disadvantageous in that it is difficult to treat waste pallets because they are not environmentally friendly .

Moreover, the government is strengthening its waste disposal regulations to limit imports of plastic pallets and imposes environmental fees of approximately 15 times that of imported plastic pallets, one of the restrictions.

Therefore, there is a demand for the development of a pallet that is environmentally friendly and has excellent strength.

KR 10-2006-0135032 A KR 10-2004-0053352 A KR 10-2007-0019694 A KR 10-2008-0079498 A

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the problems of the conventional wooden and plastic pallets as described above, and it is an object of the present invention to provide an environmentally friendly pallet having excellent strength and being environment- .

An object of the present invention is to provide an environmentally friendly pallet, wherein the pallet is formed by assembling a plurality of chip blocks, and the chip block is manufactured by compression molding a mixture of rice hull powder and an adhesive in a warm- The adhesive is achieved by configuring it to be selected from a vinyl acetate adhesive and a synthetic acrylic adhesive.

In the present invention, the rice hull powder is characterized by being modified by an aqueous solution of sodium hydroxide.

Further, the present invention is characterized in that the rice husk powder and the adhesive are mixed at a weight ratio of 2: 1 or 1: 1.

Another object of the present invention is to provide a process for producing an eco-friendly pallet, comprising the steps of: preparing a rice hull powder by grinding rice hulls to prepare rice hull powder having a proper particle size; A rice husk powder reforming step of contacting the surface of the rice husk powder with a basic solution and then washing with water to modify the rice husk powder; An adhesive mixing step of mixing the surface-modified rice husk powder with an adhesive to produce a mixture; A compression molding step of putting the mixture of the rice husk powder mixed with the adhesive into a compression molding machine and molding the mixture in a warm and pressurized state; A chip block forming step of forming a plurality of chip blocks having different lengths and thickness by cutting a molded product formed by a compression molding step; And a chip block assembling step of assembling a plurality of chip blocks prepared by the chip block forming step to produce a pallet.

The compression molding process in the compression molding step of the present invention is performed at a temperature of 150 to 300 ° C and a pressure of 20 to 50 kgf / cm ² .

INDUSTRIAL APPLICABILITY According to the present invention, a pallet can be manufactured at a low cost and in an environmentally friendly manner, because the pallet is produced based on a natural material, such as rice hulls.

In addition, since the present invention uses a modified rice husk powder for producing a chip block for producing a pallet, the bonding strength with the adhesive is strengthened to produce a chip block having excellent strength. Therefore, when using a pallet, It is not easily formed or broken.

In addition, since the chip block for manufacturing the pallet is manufactured by press-molding a mixture of the rice hull powder and the adhesive, the surface of the chip block is smooth and the surface is not easily spoiled or unexpected even when exposed to rainwater, Can be produced.

1 is a flowchart illustrating a method of manufacturing an environmentally friendly pallet using a rice husk according to the present invention.

Hereinafter, a method of manufacturing a pallet according to an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, the method for preparing a pallet according to the present invention comprises preparing a rice husk (S100), a rice husk surface modification step (S200), a rice husk surface modification step A rice husk mixture manufacturing step S300, a compression molding step S400, a chip block cutting step S500, and a chip block assembling step S600.

(1) Rice husk powder preparation step (S100)

This step is a step of preparing rice husk powder having an appropriate particle size by crushing the rice husk as a main component of the chip block for producing the pallet. In the present invention, when the pallet is manufactured, The rice husks were crushed in a crusher and then pulverized. Then, 20-mesh, 50-mesh and 100-mesh sieves were successively passed through to obtain rice husks having 20-50 mesh, 50-100 mesh, Powder is prepared, and then each of the rice husk powders having different particle diameters is mixed at an appropriate mixing ratio. By this, the porosity between the rice husk powders is lowered, and as a result, after forming into a chip block by a compression molding process described later, And as a result, the strength of the pallet is improved.

(2) Rice husk powder surface modification step (S200)

This step is a step of modifying the surface of the rice husk powder to improve the adhesion of the rice husk powder with the adhesive in the mixing step described later after preparing the rice husk powders of four particle sizes by the rice husk powder preparing step (S100) to be.

To this end, a basic solution such as sodium hydroxide (NaOH) solution is used as a modifier in the present invention. The basic solution and the rice husk powder are put into a stirrer at a volume ratio of 1:15, followed by mixing for about 2 to 3 hours with stirring.

After the mixing and stirring process is completed, the rice husk powder is washed with water, and then the rice husk powder is heated for about 2 to 3 hours by applying hot air at about 100 ° C to the rice husk powder. Through this series of processes, As a result, the rice hull powder easily bonds with the adhesive in the adhesive mixing step (S300) described later.

(3) Adhesive Mixing Step (S300)

In this step, the rice husk powder modified by the rice husk powder surface modification step (S200) is put into an agitator and stirred while mixing with the adhesive to mix the rice husk powder and the adhesive at a certain ratio. In this step, A powder mixture is prepared, wherein an adhesive selected from a vinyl acetate adhesive or a synthetic acrylic adhesive is used.

When the adhesive is mixed with the rice hull powder, 2% by weight of an adhesive is used for 1% by weight of the rice hull powder, and water is used for dilution. Water is added in an amount of 0.4 to 0.5% by weight Is used.

After the mixture of the rice hull powder and the adhesive is prepared by the above process, the mixture is made into a state suitable for molding in an oven.

(4) Compression molding step (S400)

In this step, the dry mixture prepared in the adhesive mixing step (S300) is put into a compression molding machine, and the compression molding is performed at a pressure of 20 to 50 kgf / cm ² for about 20 minutes, At this time, the internal temperature of the molding machine is maintained at about 150 to 300 ° C so as to increase the molding efficiency.

(5) Chip block formation step (S500)

In this step, the compression-molded product is cut in a compression molding step (S400) to form a plurality of blocks and plate-shaped chip blocks (collectively referred to as " chip blocks ") having a shape and a length and a thickness suitable for producing a pallet As shown in FIG. 2 and FIG. 3, the pallet 10 to be manufactured according to the present invention comprises a lamination plate, a joint plate, a support plate and a bottom plate from the upper part. The bottom plate may be manufactured using a chip block made of rice husk, or may be manufactured as a wood plate.

The pallet to be manufactured in the present invention is a pallet generally used in an industrial field, and its structure is well known, so a detailed description thereof will be omitted.

(6) Pallet assembling step (S600)

This step is a step of fabricating a pallet by assembling the chip blocks having various shapes and sizes prepared by the chip block preparation step (S500), and when assembling the pallet, Then, the pallet is manufactured by combining each chip block using a nail or a bolt nut.

The pallet is manufactured through the series of processes as described above. In order to confirm whether the physical property required when the pallet is manufactured using the chip block manufactured according to the present invention by the present inventors, Hereinafter, each of these experiments will be described as an embodiment.

≪ Example 1 >

Example 1 relates to an experiment for evaluating the influence of the size of rice husk powder particles in an experiment. In the experiment, the rice husk was put in a pulverizer and pulverized. Then, the pulverized rice husk powder was applied to 20 mesh, 50 mesh and 100 mesh To prepare four rice husk powders of 20 mesh or less, 20 to 50 mesh, 50 to 100 mesh and 100 mesh or more.

Of the rice husk powders having the four sizes prepared by the above procedure, the rice husk powder having the largest particle size and having a size of 20 mesh or less was put into the agitator, and an aqueous sodium hydroxide solution diluted to a molar concentration of 3% And the mixture was stirred for about 20 hours to bring the surface of the rice husk powder into contact with aqueous sodium hydroxide solution for a sufficient period of time. Then, the rice husk powder was washed and dried for 20 hours under hot air at 100 ° C .

The vinyl acetate adhesive was added to the dried rice husk powder by the above procedure to stir the mixture of the rice hull powder and the vinyl acetate adhesive in a weight ratio of 1: 2 to prepare a mixture, and the resulting mixture was dried at room temperature for 2 hours Dried mixture, and then placed in a compression molding machine whose internal temperature is maintained at 250 ° C. and a pressure of 30 kgf / cm ² is applied for 20 minutes to form a plate-shaped molded body. The molded body is then shaped into a plate having a length of 10 cm and a width of 4 cm And the test pieces were prepared by cutting the rice husk powder having different particle sizes in the same manner as above, and the physical properties such as density and strength were measured on these test pieces.

≪ Example 2 >

Example 2 relates to an experiment for confirming the effect of modifying the rice husk powder according to the use and concentration of sodium hydroxide. In the experiment of Example 2, rice husk powder having a particle size (average particle diameter) of 50 to 100 meshes The procedure of Example 1 was repeated except that the aqueous solution was diluted with an aqueous solution of sodium hydroxide diluted to a molar concentration of 1%, 3%, and 5%, respectively, while the mixture was placed in an agitator.

≪ Example 3 >

Example 3 relates to an experiment for observing the change in the strength of a pallet chip block depending on the type and mixing amount of the adhesive. In the experiment of Example 3, the mixing ratio of the adhesive to the two kinds of adhesives of the vinyl acetate adhesive and the synthetic acrylic adhesive 1: 1, 1: 2, 1: 3, and the rest of the experimental procedure is the same as that of Example 1. [

Table 1 below shows the results of experiments according to Examples 1 to 3 above.

division Powder size
(Messi) Sodium hydroxide (molar concentration) glue warp
burglar compression
burglar 0 One% 3% 5% Vinyl acetate Synthetic acrylic 1: 1 2: 1 3: 1 1: 1 2: 1 3: 1 (Kgf / cm ² ) Example 1 20 or less 3% 2: 1 392 2049 20 to 50 3% 2: 1 419 2190 50-100 3% 2: 1 481 2515 100 or more 3% 2: 1 512 2677 Example 2 50-100 0 2: 1 454 2373 50-100 One% 2: 1 477 2494 50-100 3% 2: 1 617 3226 50-100 5% 2: 1 500 2614 Example 3 50-100 3% 1: 1 477 2494 50-100 3% 2: 1 550 2875 50-100 3% 3: 1 620 3241 50-100 3% 1: 1 495 2580 50-100 3% 2: 1 605 3163 50-100 3% 3: 1 649 3393

As can be seen from the experimental results shown in Table 1, in Example 1, the larger the particle size of the rice husk powder was, the lower the compressive strength and the bending strength, and the smallest particle size showed the highest strength, If it is 100 mesh or less, it is difficult to stir.

In Example 2, it was found that the strength when the surface of the rice husk powder was modified by using an aqueous solution of sodium hydroxide to make a chip block was not modified and the strength was much higher than that in the case of producing a chip block. When the rice husk powder was modified with sodium aqueous solution, the effect of modifying 1% aqueous solution was somewhat insufficient. When the aqueous solution of 3% or more concentration was used, the modifying effect was remarkable. 3% The difference in strength between the aqueous solution and the 5% aqueous solution was not significant.

Also, in Example 3, no significant difference in strength was observed between the adhesive and the acrylic adhesive, and the strength was increased as the amount of the adhesive was increased. However, when the ratio of the hog powder to the adhesive was 2 : 1, and the higher the proportion of the adhesive, the higher the production cost. Therefore, the ratio of the rice hull powder to the adhesive is preferably 2: 1.

In order to confirm the structural integrity of the pallet produced by the above process, the inventors of the present invention measured the volume ratio of rice hull powder of 50-100 mesh size and sodium hydroxide aqueous solution diluted to 3% And the mixture was stirred for about 20 hours to bring the surface of the rice husk powder into contact with the aqueous solution of sodium hydroxide for a sufficient period of time. Then, the rice husk powder was washed, dried for 20 hours under hot air at 100 ° C, A vinyl adhesive agent was added thereto to prepare a mixture by mixing the rice hull powder and the vinyl acetate adhesive in a weight ratio of 1: 3 to prepare a mixture, and the resulting mixture was dried at room temperature for 2 hours to form a dry mixture, The resultant was placed in a compression molding machine maintained at a temperature of 250 占 폚, and a pressure of 30 kgf / cm < ² > 100 size pallets were manufactured and tested for horizontal and vertical compressive strength according to the pallet test method specified in ISO 8611-1 of KS A, and the test results are shown in Table 2 below.

Powder size
(Messi) Sodium hydroxide Adhesive (vinyl acetate) Vertical compressive strength
(Kgf / cm ² ) Horizontal compressive strength
(Kgf / cm ² ) 50-100 3% 3: 1 4,300 5,400

INDUSTRIAL APPLICABILITY As described above, the present invention can produce a pallet that is environmentally friendly and has excellent strength, by producing a pelletizing chip block based on rice hulls.

Claims (9)

In the pallet used to transport objects,
The pallet is formed by assembling a plurality of chip blocks,
Wherein the chip block is produced by compression molding a mixture obtained by mixing rice hull powder and an adhesive under a warm-pressing condition,
The rice hull powder is modified by bringing a basic solution into contact with the surface, washing it with water and then drying it,
Wherein the adhesive is selected from a vinyl acetate adhesive and a synthetic acrylic adhesive,
The rice husk powder and the adhesive were mixed at a weight ratio of 1: 2,
The compression molding is performed at a pressure of 20 to 50 kgf / cm < ² > and at a temperature of 200 to 300 DEG C,
0.4 to 0.5% by weight of water is mixed with 1% by weight of the rice flour powder in the mixture of the rice husk powder and the adhesive,
The rice husk powder is prepared by preparing rice husk powder having four grain sizes of 20 mesh or less, 20 to 50 mesh, 50 to 100 mesh and 100 mesh or more, and then mixing each of the rice husk powders having different grain sizes with each other Eco-friendly pallet using chaff.
delete delete delete A method of manufacturing a pallet for use in transporting objects,
A rice husk powder preparing step (S100) of preparing rice husk by grinding;
A rice husk powder reforming step (S200) for modifying the rice husk powder by contacting with the surface of the rice husk powder using a basic solution and then washing with water;
An adhesive mixing step (S300) of mixing the surface-modified rice hull powder with an adhesive selected from a vinyl acetate adhesive and a synthetic acrylic adhesive at a weight ratio of 1: 2 to produce a mixture;
A compression molding step (S400) of putting the mixture of the rice hull powder mixed with the adhesive into a compression molding machine and molding at a pressure of 20 to 50 kgf / cm ² and a temperature of 200 to 300 ° C;
Forming a plurality of chip blocks having different lengths and thicknesses by cutting the molding formed by the compression molding step (S400);
(S600) assembling a plurality of chip blocks prepared by the chip block forming step (S500) to fabricate a pallet,
0.4 to 0.5% by weight of water is mixed with 1% by weight of the rice flour powder in the mixture of the rice husk powder and the adhesive,
The rice husk powder is prepared by preparing rice husk powder having four grain sizes of 20 mesh or less, 20 to 50 mesh, 50 to 100 mesh and 100 mesh or more, and then mixing each of the rice husk powders having different grain sizes with each other A method for manufacturing an environmentally friendly pallet using rice hulls. delete delete delete delete

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