KR100700634B1 - Agricultural waste-wood particle composite board - Google Patents

Abstract

A composite board of agricultural waste material containing lignocellulosic material, wood particles, and foam form thereof are provided. The composite board and foam-type composite material is a functional composite material that recycles agricultural waste resources, and has excellent properties compared to existing wood plate materials and sound absorbing materials for building interiors, and can be suitably used as a substitute for the material.

Agricultural waste resources, sound absorbing materials for building interiors, wood plate materials

Description

AGRICULTURAL WASTE-WOOD PARTICLE COMPOSITE BOARD}

1 illustrates an example of a manufacturing process of a waste tire-farming waste resources composite board according to the present invention.

2 illustrates a case where the composite board according to the present invention is used inside a building wall.

Figure 3 shows the classification by the site and size of agricultural waste resources (Crest) used in the present invention.

4a and 4b are graphs showing the water absorption rate measurement results of the rice straw-waste tire composite board according to the present invention.

5a and 5b are graphs showing the results of measuring the thickness expansion ratio of rice straw-waste tire composite board according to the present invention.

6a and 6b are graphs showing the bending fracture coefficient measurement results of the rice straw-waste tire composite board according to the present invention.

7a and 7b are graphs showing the results of measuring the flexural modulus of the rice straw-waste tire composite board according to the present invention.

Figure 8 is a graph showing the load-deformation curvature of the rice straw-waste tire composite board of the present invention.

9a and 9b are graphs showing the peel strength measurement results of the rice straw-waste tire composite board according to the present invention.

10 is a graph showing the sound absorption rate of the rice straw-waste tire composite board of the present invention.

The present invention relates to a composite board of agricultural waste and wood particles containing lignocellulosic material, and a composite of foam form thereof.

With the recent improvement in living standards, the enhancement of housing culture and health, various building materials, interior materials, and flooring materials are made from natural materials such as wood or petrochemical products. It is gradually being replaced by density fiberboard, particle board, etc., and therefore, there is an urgent need for the stable supply and demand of raw materials and the development of alternative raw materials as the use of wood materials increases.

The agricultural waste resources include rice straw, straw, corn stalks, barley straw, etc., and it is a natural raw material containing a large amount of lignocellulosic materials similar to wood raw materials and has the potential to replace wood raw materials. .

However, until now, these agricultural waste resources are mainly used as low value-added materials such as feed, mushroom cultivation, composting, or roof coverings, and the necessity of researches on recycling methods and product development that can create high value is increasing. have. In addition, asbestos, rock wool, and glass fiber, which are used as sound absorbing and insulation materials for building interiors, have been pointed out in terms of harmful components and environmental pollution. The development of materials is increasingly required.

In view of the recycling of resources due to the lack of wood resources, studies have been actively conducted to replace wood particles with new lignocellulosic materials. Particle board (particle board) is the most eco-friendly product that can be recycled most efficiently, and the government is recognizing its importance, and GR (Good Recycling) item certification is being reviewed. Particleboard is a product made by processing ordinary wood or waste wood in the state of particles or chips by grinding method, and then thermoforming by mixing an appropriate amount of adhesive. Therefore, lignocellulosic materials such as rice straw, straw, corn stalks, barley straw, etc. If a suitable adhesive and raw material processing method is developed that can be processed into particles or chips and utilize agricultural waste resources, it can replace wood raw materials that are currently insufficient and create high added value. Not only is it a potential source of partial or total replacement of ash, but is also expected to contribute significantly to the recycling of agricultural waste resources.

In recent research, Yalinkilic et al. (1998) produced particle boards at three densities using three types of urea-formaldehyde (UF) adhesives and waste tea leaves. As the result of the experiment, it was explained that the internal bonding strength and the bending strength increased as the density increased. They explained that paraffin was added to UF adhesive to improve dimensional stability, and short-term dimensional stability was improved, but there was no long-term effect, and as the amount of paraffin added increased, the mechanical properties of the board decreased.

Ajiwe et al. (1998) manufacture ceiling boards using rice husks and sawdust, and are more economical than conventional commercial ceiling boards. Explained to be excellent. In addition, the tensile strength, water absorption rate and superior tensile strength compared to the existing commercial ceiling board explained that the high silica content in the rice husk.

Karr et al. (2000) prepared a particle board using straw as an isocyanate-based adhesive and wood particle substitute, and evaluated the physical and mechanical properties of straw board according to the initial moisture content of the straw, the amount of adhesive added and the hot pressure temperature. They say that the amount of adhesive added is the most important factor in the dimensional stability and mechanical properties when manufacturing straw boards.The initial moisture content of straw is more influenced by mechanical properties than dimensional stability, and hot-pressure temperature is more affected by dimensional stability than mechanical properties. I explained it was crazy.

Okino et al. (2000) developed a low-density board based on UF, tannin-paraformaldehyde (TP) adhesives, and torn newspaper, magazine and office waste paper. It was reported that the board made of 12% UF and TP, office waste paper, and newspaper paper were the best mechanical properties. It was also reported that the boards made of UF were superior to the boards made of TP when the adhesive levels were the same.

Karr et al. (2000) found that reconstituted lignocellulosic products have problems with dimensional stability, but when manufacturing straw boards, steam-like acetylation of straw increases dimensional stability. Reported. However, as the acetyl treatment increased, the flexural failure coefficient (MOR), flexural modulus (MOE) and density could be reduced.

Viswanathan et al. (1999, 2000) describe cores using phenol-formaldehyde (hereinafter referred to as 'PF'), UF adhesives and core pith particles of 0.45, 0.80, 1.20, and 2.10 mm sizes. Coir pith particle boards were made and reported that boards made of PF adhesive and large particles exhibited better dimensional stability as well as physical and mechanical properties.

Akaranta (2000) manufactured particle boards using rubber seed pods, cashew nut shell particles and cashew nut-shell liquid adhesives, and compared to commercial boards, flexural strength and dimensional stability. Many studies are underway, including reporting that this is better.

Therefore, the present inventors have tested the physical and mechanical properties of wood composites prepared by mixing agricultural by-products containing lignocellulosic material with adhesive after appropriate raw material treatment in order to find ways to utilize agricultural waste resources as building materials. As a result of evaluating the possibility of practical use, the present invention confirmed the feasibility of development as a functional composite material and completed the present invention.

Accordingly, an object of the present invention is to examine the applicability of agricultural waste resources as raw materials of functional composite materials, and to develop applications that properly utilize the advantages of agricultural waste resources as recycled resources.

Specifically, it is an object of the present invention to provide an agricultural waste resources-wood particle composite board exhibiting excellent heat insulating properties and air intake by replacing existing wood materials.

Another object of the present invention is to provide a composite board produced by foam molding using a foamed adhesive.

Still another object of the present invention is to provide a use of the agricultural waste resource-wood particle composite board as a sound absorbing material for building interiors.

The present invention relates to a composite board of agricultural waste resources and wood particles containing lignocellulosic material, wherein the composite board contains fragments of agricultural waste resources containing wood particle particles and lignocellulosic material, and these It has a structure that is coupled to each other.

As used herein, the term "wood particles" refers to particles used in manufacturing a general particle board, and the shape and type thereof are not particularly limited.

As used herein, the term "agricultural waste resources containing lignocellulosic material" refers to waste resources containing lignocellulosic materials as by-products produced in the agricultural sector, and these are simply referred to as "agricultural waste resources". Examples include rice straw, straw, corn stalks, barley straw and the like. Lignocellulosic materials contained in rice straw, straw, barley straw, etc., exhibit similar properties to woody materials.

In addition, the term "fragment of agricultural waste resources" refers to fragments obtained by cutting the agricultural by-products such as rice straw, straw, corn stalks and barley straw into suitable sizes.

As used herein, the term "agricultural waste resource-wood particle composite board" refers to wood grain particles and pieces of agricultural waste resources (eg, rice straw, straw, corn stalks, barley straw, etc.) containing lignocellulosic material. Refers to the composite board.

As used herein, the term "adhesive" refers to all adhesives used for industrial purposes, and examples thereof include polyurethane, acrylic resin, ethylene-vinyl acetate (EVA), and polyvinylacetate (PVAc). And the like, and the like.

In the present specification, the "foaming adhesive" is foamed through appropriate pressure and temperature control to show a general adhesive effect, and includes, but is not limited to, polyurethane-based, phenol-based, and the like.

The composite board of the present invention can be obtained, for example, by a general method for producing a particle board. Figure 1 shows the process, after putting the raw material 101, a mixture of rice straw straw, which is one of agricultural waste resources containing wood particle particles and lignocellulosic material, with an adhesive, into the mold 102 After the cold press 103 is cold pressed to produce a mat 104, the mat 104 is placed between the two cowl 105, the stopper 106 is located on both sides of the mat 104 Hot compressing using hot plate 107 completes composite board 108 of wood particle-farm waste material. The completed composite board 108 is uniformly mixed with the wood particle particles and rice straw fragments which are agricultural waste resources. By appropriately adjusting the pressure of cold compression and hot compression during the process, it is possible to form pores in the composite board within the range of 3 to 20% by volume. By doing so, the mechanical strength is relatively lowered, but the sound absorption and dustproofing ability are further improved. Can be. The process can be applied to a variety of agricultural waste resources such as straw, corn straw, barley straw in addition to rice straw, which will be apparent to those skilled in the art.

According to a preferred embodiment of the present invention, using the crest as the agricultural waste resources, by selecting the part and size of the crest by manufacturing the composite board after measuring the physical and mechanical properties, the composite produced through the screening process The board has almost no difference in results, which can eliminate the screening process in mass production, leading to a reduction in production cost.

The mixing ratio of agricultural waste resources and wood particles used in the composite board of the present invention can be appropriately adjusted in a range capable of maintaining appropriate mechanical strength (bending strength, peel strength) and physical properties (specific gravity, moisture content, absorption rate, thickness expansion rate, etc.) 10:90 to 50:50 (straw straw: wood particles), more preferably 10:90 to 40:60, most preferably 20:80 to 30:70, based on the total dry weight. I can regulate it.

The adhesive used in the composite board of the present invention uses a urea resin adhesive and a foamed adhesive, and each type is not particularly limited. The present inventors used a commercially available urea-formaldehyde resin for convenience. The amount of the adhesive is not particularly limited as long as it is sufficient to maintain the combination of wood particles and agricultural waste, and is usually in the range of 5 to 25% by weight, preferably 5 to 20% by weight, based on the sum of the wood particles and agricultural waste. Used in% amounts. When using foam adhesives, the foaming conditions depend on the type of adhesive and are carried out under appropriate pressure and temperature conditions.

The present invention may further use a hardener or curing agent in addition to the adhesive, which may be used in the range of 20% by weight relative to the adhesive. In the present invention, 10% NH ₄ Cl aqueous solution was used.

As shown in FIG. 2, the agricultural waste resource-wood particle composite board of the present invention is filled with an internal insulating material 204 between exterior materials such as gypsum board 201, 202, and 203 to form a wall having excellent sound absorption. Can be. According to a preferred embodiment it can be seen that the sound absorption in a smaller range than the conventional wood particles, fiber boards and veneers.

The composite board of the present invention, the composite material in the form of foam can be used in place of the use of ordinary wood particle board, and can be used as a building material, for example, a material such as a sound absorbing board, a soft board, etc. in the wall. In particular, it has excellent thermal insulation and sound absorption properties, so it is very suitable as a sound absorbing material for building interiors, and it is a good substitute for substances harmful to the human body and causing environmental pollution, such as asbestos, rock wool, and glass fiber, which are conventionally used as sound absorbing and heat insulating materials for building interiors. It is a natural and eco-friendly material.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited thereto.

<Experimental material>

-Wood particles

As a mixed species used for general particle board as a wood particle, eighty-six layers of Falman chips were used. Particles were used after drying to a moisture content of 6.2 ± 1.2% through natural drying to adjust the mat moisture content of the board.

-Agricultural waste resources

General rice straw was collected directly from production farms as agricultural waste resources, and the straw was vertically erected vertically using a cutting device.The rice straw was vertically divided into three parts according to the size of rice straw from the bottom of the straw, and cut into upper, middle and lower parts. 3). The upper, middle and lower cut rice straws were cut into 2cm and 4cm sizes, respectively, and then the cut rice straws were dried uniformly by natural drying and dried by artificial drying to a water content of 7.8 ± 1.2%.

- glue

The adhesive used urea-formaldehyde resin for particleboard manufacture of 56% of solid content.

-Curing agent

The curing agent used a 10% NH ₄ Cl solution.

Example 1

Fabrication of Crests-Wood Particle Composite Board

In order to manufacture the composite board, the straw straw cut by the part and size of the selected straw straw is mixed at a ratio of 10:90, 20:80, and 30:70 (straw straw: wood particles) based on wood particles and total weight. It was. The mixed rice straw-wood particle raw material was placed in a rotary cylindrical mixer and then urea-formaldehyde adhesive having a solid content of 56% was applied by spray spraying to 10% of the total dry weight of the whole rice straw-wood particle composite. The curing agent used was a 10% NH ₄ Cl aqueous solution and 10% was added to the urea-formaldehyde adhesive.

Put the glued rice straw-wood particle mixed raw material into the mold of 25cm × 20cm × 20cm (length × width × height), and then prepare the mat before manufacturing the straw-wood particleboard. Preheating was carried out at a pressure of ² kgf / cm ² before thermocompression to ensure a uniform density gradient of the wood particle composite.

After preloading, the mold is removed, the mat is placed on the cowl, and a 1.0 cm stopper is placed on the cowl in the longitudinal direction of the mat to obtain a constant straw-wood particle composite thickness. I put it on the mat.

Then, the cowl was placed between the hot plates of the thermocompressor, and the thermopress was applied under a thermocompression schedule of 35 kgf / cm ² , a thermocompression temperature of 140 ° C., and a main thermocompression time of 4 minutes. By relieving the vapor pressure, it prevents the mat from expanding due to the vapor pressure during curing of the adhesive inside the mat. In this state, the pressure was finally lowered once again to completely cure the adhesive in the mat, and then remove the cowl from the hot plate and remove the prepared composite was cooled to room temperature to prepare a straw-wood particle composite.

Water absorption, vibration absorption and insulation performance of the obtained composite board was measured, and the results are shown in Table 1.

Rice straw content Water absorption Insulation performance Particle board (control) 55 good 10 50 to 60 Outstanding 20 50-65 Outstanding 30 60 to 65 Outstanding

As can be seen in Table 1, the composite board of the present invention showed a similar result in water absorption and the general particle board, it was confirmed that the improved results in insulation.

Example 2

Manufacture of foam board

A foam composite board was prepared using a polyurethane-based foam adhesive as an adhesive. The prepared composite foam board is filled between the gypsum board and the insulation board as shown in Figure 2 and used in the wall.

Example 4

To evaluate the effect of straw straw on different parts, sizes and shapes of straw straw on the properties of the straw straw-wood particle composite, the straw is upright and then the top (T), middle (C) Cut into (B), and cut the straw was cut again by 2cm and 4cm by size. Straw to wood particles cut by part and size of rice straw were mixed in the ratio of 10:90, 20:80, 30:70 (straw straw: wood particles) according to the added amount based on the total weight of the straw and the same as in Example 1. Straw-wood particle composite board was prepared by the method. The mixing ratio of rice straw and wood particles is shown in Table 2.

Rice Straw-Wood Particle Composite Manufacturing Mixing Ratio Straw straw Rice straw size (cm) Mixing Ratio (%) ^a Top 2 10: 90 20: 80 30: 70 4 10: 90 20: 80 30: 70 Center 2 10: 90 20: 80 30: 70 4 10: 90 20: 80 30: 70 Bottom 2 10: 90 20: 80 30: 70 4 10: 90 20: 80 30: 70 Mixed (T-C-B) 2 10: 90 20: 80 30: 70 4 10: 90 20: 80 30: 70 Mixed (T-C-B) Mixed (2-4) 10: 90 20: 80 30: 70 a: Based on dry weight (straw straw: wood particles)

Using the obtained composite material, physical properties (specific gravity, moisture content, water absorption, thickness expansion rate) and mechanical properties (bending strength, peel strength) were measured.

Measurement of physical and mechanical properties

Specific gravity, moisture content

Specific gravity and water content of rice straw-wood particle composites were measured according to KS F 3104.

-Absorption rate, thickness expansion rate

According to KS F 3104, one piece of 5cm × 5cm is cut from each composite material per sheet, and the test piece is submerged 3cm from the surface of water in a 25 ± 1 ℃ constant temperature water bath and removed after 24 hours. The absorption rate and thickness expansion rate of 5 repetitions were measured.

-Flexural strength

According to KS F 3104, one specimen of 25 cm × 5 cm × 1.0 cm was cut out from each composite material and subjected to five repeated measurements using Hounsfield's Universal Testing Machine at a load speed of 10 mm / min and span of 15 cm.

-Peel strength

In accordance with KS F 3104, one piece of 5 cm × 5 cm specimens were cut from each composite material and subjected to 5 repeated measurements using a Zwick Universal Testing Machine at a load speed of 2 mm / min.

-Sound absorption

According to ASTM C 384-98 (American Society for Testing and Materials, 1995), three circular specimens with a diameter of 10 cm of each composite were cut three times by specific gravity (0.4, 0.6, 0.8) to absorb sound at a frequency range of 125 to 8000 Hz. Was measured. For comparison, conventional particle boards (particle boards), fiber boards (fiber boards), plywood (plywood) and the same specimens were made to measure the sound absorption.

<Results and Discussion>

A. Physical Properties

a) specific gravity, moisture content

The average specific gravity of rice straw-wood particle composites was 0.80 ± 0.01 in dry condition and water content was 7.44 ± 0.83% in dry condition. In addition, the average specific gravity of the control board (wood particle board, PB) was 0.80 ± 0.02 in dry condition, and the water content was 5.05 ± 2.79% in dry condition.

b) water absorption, thickness swelling

The absorption rate of each part of straw and its size is shown in FIGS. 4A and 4B, and the absorption rate according to each screening area showed similar behavior. Each showed a level similar to wood particle board (PB). In addition, the absorption rates of rice straw and wood particles in the same conditions of the composite material was found to be similar, but rice straw is slightly higher.

The thickness swelling ratio of each part of straw is shown in FIGS. 5A and 5B, and the thickness swelling ratio is almost no difference between the portions and size of rice straw, and the thickness swelling ratio is also increased as the amount of straw is increased. When the amount of rice straw added was 20% and 30%, the swelling ratio was slightly higher than that of the particle board, and when the amount was 10%, the level was similar. However, all showed a slightly higher thickness swelling ratio than wood particles (PB), and the straw swell length was 4 cm, and the addition amount was 30%. This is interpreted to be due to the high water absorption of rice straw containing lignocellulosic components and swelling.

Based on the results of absorption and thickness swelling test, the absorption rate was similar to that of rice straw-wood particle composite and particle board, but the thickness swelling rate was slightly higher than that of particle board. As a result of this experiment, it can be seen that there are more voids in the straw than wood particles.

B. Mechanical Properties

a) flexural strength

Modulus of Rupture

6A and 6B show the flexural failure coefficient (Modulus of Rupture) of the composite board according to the part of the crest, the size.

The flexural failure coefficient of the composites tended to increase in the order of upper <medium <lower for the parts of rice straw added, and the composites with rice straw of 4cm higher than 2cm showed higher values. In the end, composites with thicker and longer straw were better in flexural strength, as Viswanathan et al. (1999, 2000) found that boards made from large particles outperformed smaller particles. It was a trend. Accordingly, 2 cm (upper <middle <lower) <mixing, FIG. 6A); It can be seen that the flexural strength increases in the order of 4 cm (upper middle). Overall, the flexural failure coefficient satisfies all the flexural strength criteria (82kgf / cm ² or more) of the 8 type board of KS F 3104.In particular, even in the case of composites that are mixed with rice straw without selecting by size and size In most cases, it satisfies the flexural strength standard (133kgf / cm ² or more) of 13 type board of KS F 3104, which can reduce the process step of sorting rice straw used as raw material for mass production, resulting in lower production cost. You can expect

Modulus of Elasticity

7A and 7B show the flexural modulus of elasticity of the composite board according to the parts and sizes of the crests.

The flexural modulus also shows the same results as the flexural failure modulus. Flexural modulus of rupture, flexural modulus both the addition of a 4cm straw of cut at the lower part showed the highest value KS F bending strength based on the 3104 8-shaped board (flexural modulus of rupture 82kgf / cm ² or more, bending modulus of elasticity 20,400 the results showed that satisfies kgf / cm ² or more), if the addition is 10% based on the 18-type board (flexural modulus of rupture 184kgf / cm ² or more, bending modulus of elasticity 30,600kgf / cm ² or more) results to be happy Got it.

Stress-strain curve

The load-strain curve of the wood particle board (PB) and rice straw-wood particle composite is shown in FIG. 8.

The flexural failure coefficient is a value related to the maximum load (F _max ) and increases in the order of 30:70 (straw straw: wood particles) 〈PB 〈10:90 (straw straw: wood particles), and the flexural modulus is increased at the proportional limit load point. It can be seen that the slope of the tangent line increases in the order of 30:70 (straw straw: wood particles) <10:90 (straw straw: wood particles) <PB.

Based on the results of the flexural strength test, the addition of rice straw to the deterioration of the strength properties is not very significant. It can be seen that it is applicable to the use of the 18-inch board.

b) peel strength

9A and 9B show the peel strength of the composite board according to parts and sizes of rice straws (Internal Bonding Strength).

The peeling strength tended to increase in the order of lower <medium <phase for each part of rice straw added, and the composite material added with rice straw of 2cm rather than 4cm showed a slightly higher value. Contrary to the flexural strength, the composites with thinner and shorter rice straws showed better results in terms of peel strength, which was the highest when 2 cm rice straws cut from the top were added. During the peeling test of the straw straw-wood particle composite, the straw is mainly destroyed in the straw straw itself rather than the adhesive layer between the straw straw-wood particles, and the stress is concentrated in the pores of the straw, so that the cracking occurs in the straw straw itself instead of the adhesive layer between the wood particles and the straw. The thicker and longer the shape of a rice straw was, the more the peeling strength was weakened by the effect of many voids.

Overall, the KS F 3104 was found to meet the peel strength standard (1.5kgf / cm ² or more) of 8-type boards. In case of 10% rice straw and 20%, most of the 18-type boards (3.1kgf / cm) were obtained. ² or more) was obtained.

The rice straw-wood particle composites showed good strength properties for both 10%, 20%, and 30% of the amount of rice straw, and can be applied to the existing wood particle board depending on the amount of rice straw. You can expect the possibility of using it. In addition, as in the results of the previous tests, there is almost no difference between the selection and the non-selection of rice straws by part and size, and thus, the process step of selecting rice straws as raw materials can be reduced when assuming mass production. Production cost reduction is also expected.

d) sound absorption characteristics

 Figure 10 shows the sound absorption rate according to the frequency region of the composite board, particle board, fiber board and plywood for each density.

Low density (0.4 and 0.6) composite boards contain relatively high sound absorption in the 500 to 8000 Hz range due to the high porosity of particle boards, fiber boards, and plywood as they contain agricultural waste resources. However, the high density composite board having a specific gravity of 0.8 shows lower sound absorption than the particle board, which fills the voids in the wood particles, thereby reducing the void volume and thus improving the physical and mechanical properties but lowering the sound absorption characteristics.

Low density (0.4, 0.6) composite boards have a higher sound absorption as the frequency increases, which is relatively low at around 1000 Hz. This is because rice straw reflects sound waves at 1000 Hz and absorbs in the middle and above high frequency ranges. On the contrary, the fiber board and the plywood have a sound absorption rate decrease with increasing frequency, absorb sound in the low frequency region and reflect in the mid and high frequency range.

C. Conclusion

The production of rice straw-wood particle composites using agricultural waste resources was evaluated and tested on physical and mechanical properties, and a basic study on the feasibility of composites was made.

1. Absorption rate, thickness swelling rate Test results showed slightly higher value than wood particle board due to the effect of voids in rice straw. When straw was added up to 10%, rice straw had little effect on water absorption and thickness swelling ratio.

2. The bending strength test was higher than the bending strength criteria of KS F 3104 8-shaped board (flexural modulus of rupture 82kgf / cm ² or more, bending modulus of elasticity 20,400kgf / cm ² or more) in any mixing ratio. Accordingly, it is considered that rice straw can be applied as a raw material for composite materials without degrading its strength.

3. Peel strength test resulted in satisfying the peel strength standard of KS F 3104 8 type board (more than 1.5kgf / cm ² ) at all mixing ratios, and the thinner and shorter shape of the straw was added to the composite material. Showed better results.

4. When the composite material was manufactured by mixing wood particles and rice straw, there was no difference between the selection of rice straw by the part and size of rice straw and that of the non-selection. Therefore, it is assumed that the mass straw is used as a raw material when assuming mass production. Stages can be reduced, and production costs can be expected.

5. The development and utilization of composite materials with mixed wood particles and rice straw can greatly reduce production costs by recycling agricultural waste resources and partially or totally replacing raw wood plate materials. You will be able to contribute.

As described above, the composite board of the present invention partially or entirely replaces the raw material of the wood plate material as a material capable of replacing the wood material, which is a problem of the existing wood plate material, which is gradually lacking and creating a high value added, and the sound absorbing material for building interiors. It is not only a very competitive and excellent material, but also provides advantages of recycling waste resources along with the advantages of excellent heat insulation, sound absorption and low cost, and it is easy to process and mass-produced in view of the current supply and demand situation of wood resources. It can be spotlighted as a relatively inexpensive alternative material.

Claims (4)

An agricultural waste resource-wood particle composite board in which agricultural waste resource fragments containing cut lignocellulosic material and wood particles are uniformly combined by being mixed with each other by a binder. The composite board according to claim 1, wherein the agricultural waste resources containing the lignocellulosic material are selected from the group consisting of rice straw, straw, corn straw, barley straw, and a mixed composition thereof. A composite board that can be used in the wall by filling the composite board of claim 1 between the insulating panels. delete

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