WO2009136750A2

WO2009136750A2 - Artificial wood production method, and an artificial wood produced thereby

Info

Publication number: WO2009136750A2
Application number: PCT/KR2009/002416
Authority: WO
Inventors: 김희연; 양진영; 이완호; 고종이
Original assignee: 한화엘앤씨 주식회사
Priority date: 2008-05-09
Filing date: 2009-05-08
Publication date: 2009-11-12
Also published as: WO2009136750A3

Abstract

The present invention relates to an artificial wood production method in which a simple arrangement is employed to allow efficient continuous extrusion of artificial wood which is formed from a composite material comprising an outer layer and an inner layer and in which filaments are disposed continuously in the length direction in the inner layer. The present invention also relates to an artificial wood produced by this artificial wood production method. In the artificial wood production method according to the present invention, artificial wood is produced which comprises: an outer layer formed by mixing a wood fraction with an artificial resin; an inner layer formed integrally with the outer layer by means of co-extrusion; and a filament tow disposed continuously in the length direction in the inner layer. A characterising feature of the present invention is that the filament tow is disposed continuously in the length direction in the inner layer by being introduced, into the mould for forming the inner layer, through a filament-introduction pipe obtained by the integral formation of an inclined part, which is disposed at an incline from the outside of the mould towards the front inside the mould, and introduction guide parts, which are disposed in parallel inside the mould.

Description

Method of manufacturing artificial wood and artificial wood manufactured thereby

The present invention relates to a method for manufacturing artificial wood and artificial wood produced by the same, and more particularly, the artificial wood is formed of a composite of the outer layer and the inner layer, the long-fiber is arranged in the longitudinal direction in the inner layer in a simple configuration In addition, the present invention relates to an artificial wood production method and an artificial wood produced thereby to enable continuous continuous extrusion.

Recently, consumers' preference for natural wood has increased greatly, and voices of developing alternative materials for wood have increased as concerns over environmental destruction about carbon dioxide increase due to wood felling have increased. This is especially true for building materials, where demand for wood is high.

Under these backgrounds, various kinds of artificial wood having a similar texture and appearance to natural wood have been developed and marketed recently. Wood powder is applied to thermoplastic resins such as polyvinyl chloride (PVC), polypropylene (PP), and polyethylene (PE). Wood plastic composite (WPC) molded by composite extrusion is generally used.

Conventional artificial wood produced by composite extrusion molding synthetic resin and wood powder as described above is cheaper than natural wood, but can express a variety of colors and textures, such as floorboards, door frames, baseboards, door line moldings, windows and doors As a building material, its range of use is gradually increasing.

Conventional artificial wood produced by composite extrusion molding synthetic resin and wood powder as described above is cheaper than natural wood, but because it can express a variety of colors and intuition, such as floorboard, door frame, baseboard, door line molding, window material Its use range is gradually increasing as a building material, but it has the following fundamental problems.

First, the conventional artificial wood, the coefficient of linear expansion according to the temperature is larger than natural wood, there is a lot of distortion or breakage due to the repeated expansion and contraction after construction, accordingly the construction method of nailing which is a construction method of wood Difficult to apply, there was a problem that the construction cost increases by using a separate construction member.

In addition, the conventional artificial wood, there is a problem such as deflection lower than the natural wood, there is a problem that causes the increase in construction cost because the interval of the base wood to be narrowed to the bottom when applied as a flooring material.

In addition, the conventional artificial wood has a problem that the specific gravity is greater than the natural wood, the weight is high and thus the convenience and construction of the handle is not good.

This is an inevitable problem caused by the composite extrusion process of wood flour and synthetic resin, and is caused by impregnating synthetic resin between the pores of wood during the extrusion process. In other words, the specific gravity of wood is 0.6 to 0.7, and in the case of synthetic resin, the specific gravity is around 0,8, but the synthetic resin is impregnated between the fine pores of the wood during the process of compound extrusion. That's twice the level of 1.1 to 1.2.

On the other hand, recently, in terms of environmental protection and recycling of resources, artificial wood mainly made from waste wood and waste synthetic resin has attracted attention. As waste wood, wood-based raw materials such as waste materials discharged during dismantling of houses are used. As waste synthetic resins, PP trays, sheets, etc. are recycled and used in the form of crushed synthetic resin-based raw materials, which can be manufactured at low cost. However, they are difficult to apply as decorative materials or structural materials due to their low strength and low appearance quality. There was a disadvantage.

In order to compensate for the above-mentioned disadvantages of artificial wood, artificial wood has been proposed to be formed of composite material of outer layer and inner layer, but to apply linear reinforcement such as fiberglass or reinforcement to compensate linear expansion coefficient or structural strength. .

As a method of continuously disposing long fibers such as glass fibers in the longitudinal direction in the synthetic resin rod, a so-called continuous pultrusion method is generally applied.

According to this method, after the resin is extruded in the mold to surround long fibers such as glass fibers introduced from the rear end into the mold, the resin is hardened in the mold and pulled out at the front end of the mold by a pair of endless belt structures or a driving press roller. Done.

However, the glass fiber is supplied at the front end of the mold, and the drawing device must be installed at the rear end of the mold, thereby increasing the length of the manufacturing line and having a complicated structure. As conditions such as the pulling force and the pulling speed become strict, There was a problem that it is difficult to uniformly control the quality of the product.

In addition, when molding the composite material consisting of the outer layer and the inner layer, the inner layer in which the long fibers are buried must first be molded, and then the outer layer must be molded outside the molded inner layer. Since a separate mold is required for molding, there is a problem that the device cost increases in the mold cost and the maintenance cost of the mold.

The present invention has been made in order to solve the above problems of the conventional artificial wood and the manufacturing method as described above, the artificial wood formed of a composite of the outer layer and the inner layer is arranged in the longitudinal direction in the longitudinal direction inside the inner layer It is an object of the present invention to provide a method for manufacturing artificial wood that can be efficiently and continuously extruded with a simple configuration.

It is another object of the present invention to have a specific gravity similar to that of wood, lightweight, high bending strength, low coefficient of linear expansion, excellent workability, high structural strength after construction, and to minimize the occurrence of torsion or breakage To provide.

It is another object of the present invention to manufacture waste plastics at low cost, but also have excellent appearance characteristics, high bending strength, low coefficient of linear expansion, excellent workability, and high structural strength after construction. It is to provide an artificial wood that can minimize the occurrence of breakage.

Artificial wood production method according to the present invention for achieving the above object, the outer layer is formed by mixing wood powder and synthetic resin, the inner layer integrally molded to the outer layer by double extrusion, and continuous in the longitudinal direction inside the inner layer In the manufacturing method of artificial wood having long fiber bundles arranged so as to be inclined, the long fiber bundle is parallel to the inclined portion disposed inclined toward the front of the mold from the outside of the mold for forming the inner layer and the inside of the mold. It is characterized in that it is continuously disposed in the longitudinal direction in the interior of the inner layer by being introduced into the mold through the long-fiber injection pipe formed integrally formed in the injection guide portion.

According to this aspect of the invention, through the long fiber injection pipe, the long fiber bundle disposed in the inner layer is introduced into the portion adjacent to the outlet side of the mold for forming the inner layer, the long-fiber into which the inner layer molding in a somewhat hardened state By pulling the bundle and allowing it to be ejected from the mold, it is possible to arrange the long fiber bundle in the longitudinal direction inside the inner layer to be extruded, in a simple configuration and efficiently.

The long fiber bundle is coated with a synthetic resin so as to be firmly combined with the inner layer, so that the long fiber bundle is preferably introduced into the inner layer while the coated synthetic resin is softened, and the plurality of long fiber strands are twisted together. It is preferably added to the mold in a state, it is preferable to be introduced in a twisted state in a state in which there is a gap between the fiber strands so that the synthetic resin for coating can penetrate between the strands.

To this end, when applying long fibers in the untwisted state, coating them while twisting them, and in the case of applying the long fibers commercially manufactured in a tightly twisted state, loosen it to some extent and coat the synthetic resin to the inside of the long fibers. Allow it to soak in.

Meanwhile, according to the present invention, the inner layer molding material is introduced from the front of the mold, and the outer layer molding material is injected perpendicular to the extrusion direction of the mold, thereby integrally forming the outer layer molding mold and the outer layer molding mold. It is possible. The long-fiber feed pipe is placed through the initial forming part of the outer layer or inner layer, but the point outside the feed pipe is the part that corresponds to the input pipe due to the pressure in the mold because the inner layer and the outer layer are not completely cured yet. This fills up the traces of the input pipe.

As the long fiber bundle, in addition to glass fibers, mineral fibers, polyethylenterephthalate fibers, aramid fibers, natural fibers, engineering plastic fibers, and the like may be applied.

The inner layer may be formed in a solid form such as a plate or a rod, but in order to secure sufficient flexural rigidity in the same volume, the inner layer may be formed in a hollow shape. If necessary, at least one reinforcing rib may be provided in the hollow portion of the inner layer. Mold integrally.

The inner layer and the outer layer may be formed in the form of a plate facing each other, but in order to protect the inner layer of low hardness from scratches from the outside, it is preferable to form the outer layer surrounding the inner layer, and to prevent damage from the outside such as flooring. When applied to a member having no concern, it is preferable to mold the outer layer to cover a part of the inner layer in terms of cost reduction.

On the other hand, another feature of the present invention, the outer exposed portion of the artificial wood is composed of an outer layer containing a synthetic resin in the state of the raw material with excellent physical properties and relatively expensive to secure the appearance quality, the inner layer is re-imaged on the recycled synthetic resin material By applying wood flour or inexpensive wood flour, the overall manufacturing cost is lowered, and the long fiber bundles arranged in the longitudinal direction are arranged inside the inner layer, so that the overall coefficient of linear expansion expansion of the artificial wood without adversely affecting the texture of the exterior and In order to improve the structural strength, according to this aspect of the present invention, it can be manufactured at low cost, and has excellent appearance characteristics, high bending strength, low linear expansion coefficient, excellent workability, and high structural strength after construction. It is possible to provide artificial wood which can minimize the occurrence of torsion or damage.

In this case, the outer layer is 30 to 40 parts by weight of at least one synthetic resin selected from polypropylene resin, polyethylene resin and polyvinyl resin, 50 to 70 parts by weight of wood powder, 5 to 10 parts by weight of pigment, and sunscreen 1 to 5 It comprises a weight part, 1 to 5 parts by weight of chaff, the inner layer is 30 to 40 parts by weight of recycled synthetic resin, 50 to 70 parts by weight of wood powder, at least one powder selected from limestone, calcite, feldspar, talc, mica 5 ~ It is preferred to include 10 parts by weight.

Another feature of the present invention is that the outer layer with frequent contact from the outside is molded in a solid shape as in the conventional artificial wood to prevent damage due to scratching, but the interior of the scratch-related foam by forming the overall specific gravity of the artificial wood It is possible to form at approximately the same level as the natural wood, by arranging the long fiber bundle in the longitudinal direction continuously in the foam-molded inner layer, it is possible to reinforce the linear expansion coefficient and bending strength according to the temperature, the present invention According to the characteristics of the wood, it has a specific gravity similar to wood, lightweight, high bending strength, low linear expansion coefficient, excellent workability, high structural strength after construction, and to provide artificial wood that can minimize the occurrence of torsion or breakage You can do it.

In this case, the outer layer is molded by adding 50 to 70 parts by weight of wood powder and 5 to 10 parts by weight of pigment to 30 to 40 parts by weight of one or more synthetic resins selected from polypropylene and polyethylene resins, and the inner layer is 50 to 70 parts by weight of wood. 5 to 10 parts by weight of blowing agent and 5 to 10 parts by weight of dispersant are added to 30 to 40 parts by weight of any one or more synthetic resins selected from the group consisting of parts by weight, polypropylene resin, polyvinyl chloride resin, polyethylene resin and ABS resin. It is preferred to be molded.

According to the artificial wood production method of the present invention, through the long fiber input pipe, the long fiber bundle placed in the inner layer is introduced into a portion adjacent to the outlet side of the mold for forming the inner layer, the inner layer molding of a somewhat hardened state By attracting the long fiber bundles and allowing them to be ejected from the mold, it is possible to arrange the long fiber bundles in the longitudinal direction in the interior of the inner layer to be extruded in a simple configuration and efficiently.

In addition, according to the present invention, it can be manufactured at low cost by using waste synthetic resin material, and has excellent appearance characteristics, high bending strength, low linear expansion coefficient, excellent workability, high structural strength after construction, and torsion or damage It is possible to provide an artificial wood that can minimize the occurrence of.

In addition, according to the present invention, it has a specific gravity similar to wood, lightweight, high flexural strength, low coefficient of linear expansion, excellent workability, high structural strength after construction, and to minimize the occurrence of torsion or damage It can be provided.

1 and 2 is a cross-sectional view showing an embodiment of the artificial wood according to the present invention.

3 is a process chart showing the artificial wood manufacturing process of the present invention.

Figure 4 is a conceptual diagram illustrating the configuration of putting a long fiber bundle into the inner mold forming.

5 is a cross-sectional view of the inner and outer layers integral mold.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are cross-sectional views of the artificial wood according to the present invention, the artificial wood according to an embodiment of the present invention, the outer layer (1) formed by mixing wood powder and synthetic resin, and the outer layer (1) by double extrusion It is integrally formed in the inner layer (2), which is formed by mixing wood powder in the recycled synthetic resin material, and has a long fiber bundle (3) arranged continuously in the longitudinal direction inside the inner layer.

The outer layer 1 is formed by applying synthetic resin in the form of pure raw materials, such as general artificial wood, and at least one synthetic resin selected from polypropylene resin (PP), polyethylene resin (PE), and polyvinyl resin (PVC) 30-40. 5 parts by weight of pigment, 5 to 10 parts by weight of pigment, 1 to 5 parts by weight of sunscreen, and 1 to 5 parts by weight of chaff are formed by weight part, and wood powder 50 to 70 parts by weight. It is molded integrally by a double extrusion process on the outside of it.

The inner layer 2 is made of a relatively inexpensive material, which is not exposed to the outside, but does not adversely affect the appearance quality, and a reinforcing material such as long fiber is disposed so that the overall coefficient of linear expansion expansion or structural strength of the artificial wood can be adjusted. The part to be improved is formed by adding 30 to 40 parts by weight of recycled synthetic resin and 5 to 10 parts by weight of at least one powder selected from limestone, calcite, feldspar, talc and mica to 50 to 70 parts by weight of wood powder.

Waste synthetic resin applied to inner layer (2) is recycled by crushing PP tray, sheet, etc. Recycled synthetic resin raw materials are recycled, and wood powder is recycled wood powder manufactured by applying relatively low cost wood powder or crushing waste wood. Apply.

Artificial wood according to another embodiment of the present invention, the outer layer (1) is formed by mixing wood powder and synthetic resin, and integrally molded in the outer layer (1) by double extrusion, foamed mixture of wood powder and synthetic resin with a foaming agent And an inner layer (2) to be molded, and a long fiber bundle (3) arranged continuously in the longitudinal direction inside the inner layer.

The outer layer (1) is formed in a solid form like a conventional artificial wood to prevent damage due to scratching, 50 to 70 parts by weight of wood powder, 30 to 40 parts by weight of at least one synthetic resin selected from polypropylene resin and polyethylene resin It is molded by adding 5 to 10 parts by weight of the pigment, and integrally molded by a double extrusion process to the outside of the inner layer 1 which is foam molded and discharged from the mold.

The inner layer 2 is a portion that is not affected by scratches from the outside. The inner layer 2 is foamed and molded so that the overall specific gravity of the artificial wood can be formed at about the same level as the natural wood. 50 to 70 parts by weight of wood powder, 5 to 10 parts by weight of blowing agent, and 5 to 10 parts by weight of polypropylene resin, polyvinyl chloride resin, polyethylene resin, 30 to 40 parts by weight of any one or more synthetic resins selected from the group consisting of ABS resin. It adds weight part and foams it.

In the above embodiments, it is preferable to include 1 to 5 parts by weight of the binder when forming the inner layer and the outer layer in order to improve the bonding between the synthetic resin and other materials, that is, wood powder, the inner layer 2 is a solid such as a plate or rod It is also possible to form in the form, but in order to ensure sufficient bending rigidity in the same volume, as shown in the embodiment of Figs. 1 and 2, it is preferable to mold in a hollow form, if necessary, the hollow of the inner layer At least one reinforcing rib 2a is integrally formed in the portion.

The inner layer 2 and the outer layer 1 may be formed in the form of a plate facing each other, but in order to secure the appearance quality and to protect the inner layer having a relatively low hardness from scratches from the outside, as shown in FIG. 2. As described above, it is preferable that the outer layer 1 is formed into a shape that completely encloses the inner layer 2, and when the outer layer 1 is applied to a member having a part which is not likely to be damaged from the outside, such as flooring, the outer layer 1 is the inner layer 2 Mold to cover a part of).

The long fiber bundle 3 is for reinforcing the coefficient of linear expansion and the bending strength according to temperature, and includes glass fiber, mineral fiber, polyethylen terephthalate (PET) fiber, aramid fiber, natural fiber (Jute, Kenaf, Hemo, Flax, etc.), consisting of one or more fibers selected from the group consisting of engineering plastic fibers, which is disposed inside the inner layer in a state coated with a synthetic resin so as to be firmly combined with the inner layer to be integrated. desirable.

A plurality of long fiber strands are formed twin in each other. It is preferable that the coating synthetic resin is coated to penetrate to the inside of the twisted state. For this purpose, when the long fiber in the untwisted state is applied, the coated synthetic resin is coated while twisting, and the long fiber is manufactured in a tightly twisted state. In the case of applying, it is preferable to loosen it to some extent to allow the synthetic resin for coating to penetrate into the long fiber.

On the other hand, in order for the long fiber bundle 3 to be arranged continuously in the longitudinal direction inside the inner layer, adjacent to the exit side of the mold for forming the inner layer, that is, the molded article is cured to some extent to attract the long fiber bundle By being inclined into the mold from the mold outer peripheral surface at a position that can be discharged from the mold, in a simple configuration, the long fiber bundle can be arranged in the longitudinal direction inside the inner layer to be extruded.

Hereinafter, the method for manufacturing the artificial wood of the present invention will be described in detail with reference to the process diagram of FIG. 3 and the cross-sectional view of the mold for forming the inner layer of FIG. 4.

The process diagram is largely divided into an inner layer forming step 10, a long fiber coating step 20, and an outer layer forming step 30.

In the inner layer forming step 10, an extrusion process of the inner layer and a long fiber insert process into the inner layer are performed, and 30 to 40 parts by weight of recycled synthetic resin, 50 to 70 parts by weight of wood powder and dispersant are talc, limestone, calcite, 5-10 parts by weight of silicate minerals such as talc talc and mica are added.

Wood flour and synthetic resin are master batched (M / Batch), that is, beaded and added, or wood flour, synthetic resin and dispersant are all master batched and added.

The extrusion temperature is adjusted to 170-200 ° C., the molding part 100-150 ° C., the cooling part 50-120 ° C. of the mold, and the long fiber bundle 3 that has undergone the long fiber coating step 20 is shown in FIG. 4. As shown, it is introduced through the long fiber injection pipe 12 installed in the mold 11 for forming the inner layer (2).

The long fiber inlet pipe 12 is integrally formed with an inclined portion 12a that is inclined from the outside of the mold toward the inside of the mold and an injection guide portion 12b that is arranged parallel to the inside of the mold, and is pressed into the mold. .

The long fiber bundle introduced into the mold through the long fiber inlet pipe 12 is discharged from the mold 11 together with the molded product in a state that is hardened to some extent by the cooling unit.

Reference numeral 11a denotes a core for forming the hollow portion.

The long fiber coating process 20 is a process of coating with a synthetic resin so that the long fiber bundles are firmly combined with the inner layer to be integrated, and the long fiber is made of glass fiber, mineral fiber, natural fiber, engineering plastic fiber At least one fiber selected from the group is applied, and polypropylene resin or polyethylene resin is added together with a bonding aid to be heated (21) at a temperature of 150 to 200 ° C. to be introduced into the inner layer forming process (10).

The coated long fiber bundle is wound up in a roll form without directly being injected into the inner layer forming process 10, and then dried at a temperature of 50 to 100 ° C. to be wound up.

As described above, a plurality of long fiber strands are formed in a twin state with each other. It is preferable that the coating synthetic resin is coated to penetrate to the inside of the twisted state. For this purpose, when the long fiber in the untwisted state is applied, the coated synthetic resin is coated while twisting, and the long fiber is manufactured in a tightly twisted state. In the case of applying, it is preferable to loosen it to some extent to allow the synthetic resin for coating to penetrate into the long fiber.

The outer layer molding step 30 is a step of molding the outer layer on the outside of the inner layer by double extrusion, 30 to 40 parts by weight of at least one synthetic resin selected from polypropylene resin and polyethylene resin, 50 to 70 parts by weight of wood powder, 5 to 10 parts by weight of the pigment, 1 to 5 parts by weight of the sunscreen, and 1 to 5 parts by weight of chaff are formed by molding, and the wood powder and the synthetic resin may be added by master batching with the pigment.

The extrusion temperature is adjusted to 170-200 ° C., the mold part 100-150 ° C., the cooling part 50-100 ° C., and the natural wave pattern molding or surface embossing molding is performed using the difference in viscosity of the base resin of each pigment. .

5 is a cross-sectional view of the mold for forming the inner and outer layers according to another embodiment of the present invention, wherein the mold for forming the outer layer 3 and the mold for forming the inner layer 2 are integrally formed, thereby forming the inner layer forming material 2a. ) Is fed from the front of the mold, the outer layer forming material (3a) is an embodiment in which the vertically perpendicular to the extrusion direction of the mold bar, the inclined portion 12a and the feeding guide 12b integrally formed long fibers The input pipe 12 is provided in the same manner as in the previous embodiment, and the long-fiber input pipe is disposed through the initial forming portion of the outer layer or the inner layer, but the point outside the input pipe is completely cured by the inner layer and the outer layer. Since it is not in the state, the portion corresponding to the input pipe is filled by the pressure in the mold, and the trace of the input pipe disappears. According to the experimental result, the installation of the long fiber input pipe 12 is not affected. It was confirmed that a smooth appearance surface could be obtained.

Claims

In the manufacturing method of artificial wood comprising an outer layer formed by mixing wood powder and synthetic resin, an inner layer formed integrally with the outer layer by double extrusion, and a long fiber bundle continuously arranged in the inner layer in the longitudinal direction,

The long fiber bundle is inside the mold through a long fiber inlet pipe formed integrally with the inclined portion disposed inclined toward the front of the mold from the outside of the mold for forming the inner layer and the injection guide portion disposed parallel to the inside of the mold. Method of manufacturing artificial wood, characterized in that arranged in the longitudinal direction in the interior of the inner layer by being added to.
The method of claim 1, wherein the long fiber bundle is coated with a synthetic resin so as to be firmly combined with the inner layer, the artificial wood, characterized in that the coating synthetic resin is introduced into the inner layer in a softened state Manufacturing method.
The method of claim 2, wherein the long fiber bundle is a state in which a plurality of long fiber strands are introduced into the mold while twisted with each other, there is a gap between the fiber strands so that the coating synthetic resin can penetrate between the strands and the strands Artificial wood manufacturing method characterized in that it is put into a loose twisted state.
2. The mold according to claim 1, wherein the mold for forming the inner layer and the mold for forming the outer layer are integrally formed so that the material for forming the inner layer is fed from the front of the mold and the material for forming the outer layer is perpendicular to the extrusion direction of the mold. Artificial wood manufacturing method characterized in that.
The method according to any one of claims 1 to 4,

The long fiber bundle is made of artificial wood, characterized in that made of one or more fibers selected from the group consisting of glass fibers, mineral fibers, polyethylenterephthalate fibers, aramid fibers, natural fibers, engineering plastic fibers.
The method according to any one of claims 1 to 4,

The inner layer is artificial wood manufacturing method, characterized in that molded in the hollow form.
The method of claim 6,

At least one reinforcing rib is integrally molded in the hollow portion of the inner layer, artificial wood manufacturing method.
The method according to any one of claims 1 to 4,

The inner layer is artificial wood manufacturing method, characterized in that the molded by mixing wood powder with recycled synthetic resin material.
The method of claim 8,

The outer layer is 30-40 parts by weight of at least one synthetic resin selected from polypropylene resin, polyethylene resin and polyvinyl resin, 50-70 parts by weight of wood powder, 5-10 parts by weight of pigment, and 1-5 parts by weight of sunscreen. And, containing 1 to 5 parts by weight of chaff,

The inner layer is made of artificial wood, characterized in that it comprises 30 to 40 parts by weight of recycled synthetic resin, 50 to 70 parts by weight of wood powder, and 5 to 10 parts by weight of at least one powder selected from limestone, calcite, feldspar, talc and mica. Way.
The method according to any one of claims 1 to 4,

The inner layer is artificial wood manufacturing method, characterized in that the molded by molding a mixture of wood powder and synthetic resin with a blowing agent.
The method of claim 10,

The outer layer is molded by adding 50 to 70 parts by weight of wood powder and 5 to 10 parts by weight of pigment to 30 to 40 parts by weight of one or more synthetic resins selected from polypropylene and polyethylene resins,

The inner layer is 50 to 70 parts by weight of wood powder, polypropylene resin, polyvinyl chloride resin, polyethylene resin, 30 to 40 parts by weight of at least one synthetic resin selected from the group consisting of ABS resin, 5 to 10 parts by weight of blowing agent, dispersant Artificial wood manufacturing method characterized in that the foaming by adding 5 to 10 parts by weight.
Artificial wood produced by the method of any one of claims 1 to 10.