JP2002338699A - Extrusion molded product having external appearance characteristics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin molded product having excellent external appearance characteristics while using a wood powder-filled thermoplastic resin composition as the base material. SOLUTION: In the resin extrusion molded product composed of a base material and a surface layer, The above base material is composed of a resin composition comprising 10-80 wt.% thermoplastic resin and 90-10 wt.% wood powder and, simultaneously, hollow portions are formed in the molded product by extrusion molding, and the above surface layer is formed of a thermoplastic resin compatible with the resin of the base material in such a thickness as to cover the base material, and thus the molded product has a reduced linear expansion coefficient and an improved rigidity and, simultaneously, avoids the hygroscopicity accompanied by the filling of the wood powder, the lowering of weatherability and external appearance characteristics, and can further improve the feeling by imparting a sense of the grain of wood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin extruded product having excellent appearance characteristics, and more particularly, to a resin having excellent appearance characteristics while using a wood powder-filled thermoplastic resin composition as a base material. It relates to an extruded product.

[0002]

2. Description of the Related Art Generally, the main purpose of highly filling various fillers in a thermoplastic resin is to reduce the cost of a resin extruded product and to improve various physical and chemical properties, for example, to reduce the coefficient of linear expansion, There are improvements in strength or elasticity, hardness, wear resistance, heat resistance, etc. Various fillers are selected and used depending on the purpose.

[0003]

However, in the case of a molded product obtained by filling wood powder in a thermoplastic resin, particularly in the case of a high filling, there are problems such as increased hygroscopicity and reduced weather resistance. There is a problem in appearance characteristics such as unevenness occurring on the surface, losing smoothness, and a coarse structure due to high filling of wood flour. When these characteristics are required, it is practiced to limit the amount of wood powder to be charged, and to sacrifice the reduction in linear expansion coefficient and the improvement in rigidity.

It is already known to provide a surface layer of a thermoplastic resin on the surface of a highly-filled molded product of wood powder.
No. 67379 discloses that a mixture of 100 parts by weight of a cellulosic granular material and 0 to 40 parts by weight of a thermoplastic resin is extruded into a molding die and melted from an annular supply port opened inside the peripheral wall of the mold entrance. A method for producing a continuous molded structure having a sheath-core cross-sectional structure characterized by injecting a thermoplastic resin is described.

In this production method, the inner wall surface of the mold is lubricated by injecting the molten thermoplastic resin from the annular supply port, so that the compressed and pushed cellulose-based granules flow smoothly and, as a result, are continuously produced. Molding becomes possible. However, in this continuous molded structure,
The coarse structure of the wood powder was conspicuous through the transparent thermoplastic resin layer.

Accordingly, an object of the present invention is to provide a resin extruded product having excellent appearance characteristics while using a thermoplastic resin composition filled with wood powder as a base material. Another object of the present invention is to have a reduced coefficient of linear expansion and improved rigidity due to the filling of wood flour, and to eliminate the deterioration of moisture absorption, weather resistance and appearance characteristics associated with the filling of wood flour, The object of the present invention is to provide a resin molded body having an improved texture due to the application of the resin.

[0007]

According to the present invention, there is provided a resin extruded product comprising a substrate and a surface layer, wherein the substrate comprises 10 to 80% by weight of a thermoplastic resin, A hollow portion is formed by extrusion molding, which is made of a resin composition containing 90 to 20% by weight of wood flour, and the surface layer has a thickness sufficient to cover the base material with a thermoplastic resin compatible with the base resin. And a resin extruded product having excellent appearance characteristics. In the resin extruded product of the present invention, 1. the base material and the surface layer are formed by co-extrusion; 2. The base wood flour has a particle size of 50 to 1000 μm; 3. The surface layer is a mixture of a thermoplastic resin compatible with the base material and a colored pellet formed by coloring a resin of the same or different quality. 4. The surface layer contains less than 50% by weight of wood flour based on the composition; Preferably, the surface layer is provided with a thickness of 0.05 to 3 mm.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Function] The resin extruded product of the present invention comprises a base material and a surface layer. First, the base material is made up of 10 to 80% by weight of a thermoplastic resin and 90 to 20% by weight of wood flour. % Is basically important from the viewpoint of reducing the cost of the resin extruded product and effectively using resources. By filling the thermoplastic resin with wood powder, advantages such as a reduction in the cost of the molded article and various improvements in physical and chemical properties, such as a decrease in the coefficient of linear expansion and an improvement in the strength and elastic modulus, can be obtained. As already pointed out, also in the present invention, these advantages are exhibited by using the wood powder-filled resin composition as the base material of the molded article.

The resin extruded product of the present invention is further characterized by forming a hollow portion by extruding the base material. By making the base material hollow, advantages such as weight reduction as compared with a solid body, improvement in longitudinal bending rigidity, prevention of surface curvature due to a difference in cooling rate between the inside and outside of the molded body, and the like are obtained.

In the resin extruded product of the present invention, a surface layer made of a thermoplastic resin compatible with the resin of the base material is formed on the base material in a thickness sufficient to cover the base material. Is a remarkable feature. First, in order to fuse the surface layer and the base material integrally in, for example, a die to form a molded product having a strong integral structure, the resin constituting the surface layer is incompatible with the resin forming the base material. It must be soluble.

The surface layer conceals the base material and improves appearance characteristics, weather resistance and moisture absorption resistance, and may contain wood powder, colored pellets and the like inside. In the present invention, the above-mentioned surface layer needs to be formed with a thickness sufficient to cover the above-mentioned wood powder-filled base material in order to effectively utilize the base material without deteriorating various properties. The specific thickness varies depending on the type of resin and the amount of wood powder filling,
Generally, it is preferable that the surface layer be provided with a thickness of 0.05 to 3 mm. In order to suppress the hygroscopicity of the molded article to be low, it is desirable that the surface layer is provided over the entire periphery of the molded article.

[0012] In the present invention, it is preferred that the surface layer contains less than 50% by weight of wood flour based on the resin composition. The wood flour compounded in the surface layer has an excellent effect of concealing the base material layer and exhibiting a woody feel to provide a decorative surface, but when the amount of the wood flour is 50% by weight or more, It is not preferable because the appearance characteristics and the function as a cosmetic surface are reduced,
Further, since the amount of wood flour increases, there is a disadvantage that hygroscopicity also increases. Further, when the wood powder is contained in the surface layer at the above-described ratio, the flow orientation of the wood powder particles occurs during the melt forming, and the formed surface layer has an appearance close to the grain, and the appearance and texture are improved. improves.

In the present invention, it is preferable that the surface layer is mixed with a colored pellet obtained by coloring a resin of the same or a different kind as the thermoplastic resin compatible with the base material. This allows
Excellent wood tone on the surface of the molded body without adversely affecting the physical properties such as mechanical strength and thermal stability of the molded body and without being affected by the thickness, size, and complexity of the shape of the molded body Can appear in a stable manner.

In the resin extruded product of the present invention, the substrate and the surface layer are preferably formed by co-extrusion. The wood powder-filled resin composition used for the substrate in the present invention is one of those which is considerably difficult to mold, but using an extruder for the substrate and an extruder for the surface layer, these plural resin flows are used. By co-extrusion using a multilayer multi-die, the extrudability and shapeability are significantly improved as compared with the case of using the substrate alone, and the integral adhesion between the substrate and the surface layer is improved, It is possible to improve various surface characteristics of the molded body.

The wood flour to be mixed with the base material has a particle size of 50 to 100.
It is preferably made of 0 μm. If the particle size of the wood flour is smaller than the above range, it is difficult to control the particle size, so there is a problem in terms of cost. It is not preferable because smoothness may be lost.

[Substrate] (Wood powder-filled resin composition) (1) Thermoplastic resin As the thermoplastic resin for the substrate, for example, low density polyethylene (LDPE), medium density polyethylene (MDPE),
High density polyethylene (HDPE), linear low density polyethylene (LLDPE), polypropylene (PP), poly 1
Polyolefins such as random or block copolymers of α-olefins such as -butene, poly-4-methyl-1-pentene or ethylene, propylene, 1-butene, 4-methyl-1-pentene; ethylene-vinyl acetate copolymer Copolymers, ethylene-acrylic copolymers, ionomers and other ethylene-based copolymers; polystyrene, impact-resistant polystyrene, acrylonitrile-styrene copolymer (A
S), styrene resins such as acrylonitrile-butadiene-styrene copolymer (ABS) and α-methylstyrene-styrene copolymer; nylon 6, nylon 6-6, nylon 6-10, nylon 11, nylon 12, etc. Polyamide; thermoplastic polyester such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT); polycarbonate; polyphenylene oxide; and mixtures thereof.

One of the thermoplastic resins suitable for the purpose of the present invention is an acrylonitrile-butadiene-styrene copolymer (ABS). ABS resin itself is a general-purpose resin excellent in various properties such as moldability, impact resistance, rigidity, tensile strength, gloss and the like, and is preferably used. Various ABS resin grades such as a gloss grade, a good flow grade, an extrusion grade, a super heat resistant grade and a blow grade are known, and these grades can be selected and used according to the purpose. . Generally, the melt flow rate (JIS K7210) is 1
Those in the range of ７０70 g / 10 min are used.

Another example of a thermoplastic resin that can be suitably used for the purpose of the present invention is a polypropylene resin. As the polypropylene resin, those having an isotactic structure or those having a syndiotactic structure can be used. In addition to homopolypropylene, random copolymerized polypropylene and block copolymerized polypropylene are used. The polypropylene resin used generally has a melting point in the range of 140 to 170 ° C. and a melt flow rate (JIS K7210) of 0.5 to 60 g / 1.
It is desirable to be in the range of 0 minutes.

Other thermoplastic resins suitably used for the purpose of the present invention include polyethylene resins. The density of the polyethylene resin is 0.90 to 0.9.
7 g / cm ³ and the melt flow rate (J
Those having IS K7210) in the range of 0.06 to 45 g / 10 minutes are suitable.

As the polyethylene resin, high density polyethylene (HDPE), medium density polyethylene (MDP)
E), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE) and the like are used alone or in combination of two or more.

(2) Wood flour Wood flour having a particle size of 50 to 1000 μm is used. For example, any wood powder such as softwood, hardwood, and lauan wood is used. , Shavings, etc. or waste wood can be pulverized by ball mill pulverization and used.

(3) Processing aid When the base material is highly filled with wood flour, the dispersibility of wood flour is improved.
In order to improve the extrusion processability, it is desirable to include a polymeric processing aid. As the polymer-based processing aid, any known per se may be used, but generally, a high molecular weight acrylic processing aid or a fluorine-modified acrylic processing aid is used.

As the acrylic processing aid, a high molecular weight polymer comprising an acrylic monomer is used. Examples of the acrylic monomer include methyl (meth) acrylate, ethyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth) acrylate, isobutyl (meth) acrylate, and (meth) acrylic acid. Examples thereof include ester monomers such as n-amyl, isoamyl (meth) acrylate, n-hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and n-octyl (meth) acrylate. However, the above (meth) acrylic acid means acrylic acid or methacrylic acid. Among these, methyl methacrylate is preferred. Also,
Non-acrylic monomers such as styrene, α-methylstyrene, vinyltoluene, acrylonitrile, methacrylonitrile, and vinyl acetate may be contained.

Further, the acrylic processing aid may contain a small amount of a functional group-containing monomer component. Examples of the functional group-containing monomer component include a carboxyl group, a salt group thereof,
Amide group, hydroxyl group, amino group, epoxy group, methylol group, and those having an etherified methylol group,
Specifically, the following are mentioned. Ethylenically unsaturated carboxylic acids or anhydrides; acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid,
Citraconic acid, maleic anhydride, itaconic anhydride and the like. Amide group-containing monomers; (meth) acrylamide and the like. Hydroxyl group-containing monomers; vinyl alcohol, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, propylene glycol monoester acrylate, and the like. Amino group-containing monomer; (meth)
Dimethylaminoethyl acrylate, t-butylaminoethyl (meth) acrylate, vinylpyridine, 2-vinyl-5-ethylpyridine, oxazolylethyl (meth) acrylate, hydroxyethylaminoethyl (meth) acrylate and the like. Epoxy group-containing monomers: (meth) acrylic acid glycidyl ether, allyl glycidyl ether, butane monoxide and the like. A monomer having a methylol group and an etherified methylol group; a dimethylol compound of (meth) acrylamide and an ether compound thereof, for example, an ethyl ether compound or a butyl ether compound;

The acrylic processing aid used in the present invention generally preferably has a weight average molecular weight (Mw) of 300,000 to 5,000,000.

On the other hand, the fluorine-modified acrylic processing aid is
An acrylic resin modified with a fluoroalkyl or fluoroalkylene chain, wherein the fluoroalkyl to fluoroalkylene chain may contain an intervening oxygen atom in the chain.

For the modification with a fluoroalkyl or fluoroalkylene chain, a modification means by copolymerization of a fluorine monomer and an acrylic monomer can be used. Examples of the fluorine-based monomer include tetrafluoroethylene, hexafluoropropylene, vinyl fluoride, vinylidene fluoride, trifluorochloroethylene, perfluorovinylpropyl ether, perfluoroallyl butyl ether, perfluorodivinylethyl ether, and perfluorovinylallyl. Ether is exemplified.

As the acrylic resin component in the fluorine-modified resin, those already mentioned for the acrylic processing aid are used.

In the fluorine-modified acrylic processing aid used in the present invention, the fluorine monomer component and the acrylic monomer component exist in the form of a random copolymer, a graft copolymer, and a block copolymer. can do.

(4) Resin Composition The wood powder-filled resin composition for forming a base material of the present invention contains 10 to 80% by weight of a thermoplastic resin and 90 to 20% by weight of wood powder. If the amount of wood powder is less than the above range, it tends to be difficult to improve dimensional stability, hardness, cost performance, and the like. On the other hand, when the blending amount of the wood flour is larger than the above range, the moldability also tends to be low, and the powder tends to be brittle, and the physical properties tend to be low.

On the other hand, the processing aid is preferably used in an amount of 0.1 to 20 parts by weight per 100 parts by weight of the thermoplastic resin. If the amount of the processing aid is below the above range, the effect of improving moldability and improving various physical properties cannot be obtained, while if it exceeds the above range, the viscosity of the resin composition becomes too high, and molding is difficult. And the cost of the resin composition increases, which is not preferable.

The wood flour-filled resin composition of the present invention may contain other compounding agents known per se, such as a plasticizer, a colorant, a heat stabilizer, a weather stabilizer, an antioxidant, an antioxidant, and a light stabilizer. At least one of an agent, an ultraviolet absorber, an antistatic agent, a lubricant such as metal soap, wax or fatty acid amide, a foaming agent, a modifying resin or rubber, etc. can be blended according to a formulation known per se. For example, by blending a plasticizer, a lubricant, or a foaming agent with the resin composition of the present invention, the melt kneading property of the resin composition is improved, the processability is improved, and the weight can be further reduced. As the plasticizer, phthalate plasticizer, adipate plasticizer, ester plasticizer such as succinate plasticizer, polyester plasticizer,
Examples thereof include a phosphate ester plasticizer, an epoxy plasticizer, and a chlorine plasticizer, and a fatty acid ester and an epoxy plasticizer are particularly preferable. The plasticizer is preferably used in an amount of 0 to 50 parts by weight per 100 parts by weight of the thermoplastic resin. The lubricant is preferably used in an amount of 0.1 to 20 parts by weight per 100 parts by weight of the thermoplastic resin. The foaming agent is used in an amount of 0.1 to 1 per 100 parts by weight of the thermoplastic resin.
Preferably, it is used in an amount of 0 parts by weight.

The wood powder-filled resin composition for a base material of the present invention comprises:
Various components can be prepared by dry blending with a blender, Henschel mixer, or the like, if necessary, and then supplying the mixture to a single-screw extruder, a twin-screw extruder, or the like, followed by melt-kneading.

[Surface layer] The surface layer is made of a thermoplastic resin compatible with the resin of the base material, and conceals the base material and improves appearance characteristics, weather resistance and moisture absorption resistance. And contains therein colored pellets, wood flour and the like. A resin composition containing less than 50% by weight, preferably 3 to 30% by weight of wood flour, based on the composition, is preferably used. The thermoplastic resin constituting the surface layer has compatibility with the resin constituting the base material. Specifically, the thermoplastic resin described for the base material is used as long as the above conditions are satisfied. The resin constituting the base material and the resin of the surface layer are preferably the same type. Of course, different types of resins may be used as long as they are compatible, and there is no particular limitation on this point.

The wood powder to be mixed with the resin for the surface layer is selected to be excellent in appearance characteristics and aesthetics and reproducibility of the woody appearance when molded with the resin. Preferably, the wood powder of the surface layer has a particle size of 50 to 300 μm.

The resin composition of the surface layer is 0.1% based on the composition.
It is preferred to contain from about 20% by weight to a processing aid.
As the processing aid, those described for the resin composition of the base material are similarly used.

The resin composition used for forming the surface layer in the present invention may contain any desired components.
Colored pellets can be used to control the grain of the wood or to promote the development of the wood grain. As the colored pellet, a thermoplastic resin, an organic or inorganic pigment is blended, and as the pigment, titanium dioxide, carbon black, red oak, ultramarine, navy blue, phthalocyanine green, phthalocyanine blue, etc. are exemplified. However, it is not limited to these examples. In the resin composition for forming a surface layer, other compounding agents known per se, for example,
Plasticizers, colorants, heat stabilizers, weather stabilizers, antioxidants, anti-aging agents, light stabilizers, ultraviolet absorbers, antistatic agents, lubricants such as metal soaps, waxes or fatty acid amides, and resins for modification At least one kind of rubber or the like can be compounded according to a formulation known per se.

The resin composition for forming a surface layer is also prepared by dry-blending various components as required by a blender, a Henschel mixer, or the like, and then supplying the resulting mixture to a single-screw extruder, a twin-screw extruder, or the like, followed by melt-kneading. Can be prepared.

[Resin Extruded Product and Method for Producing the Same] The resin extruded product according to the present invention comprises a resin extruder for a substrate, a resin composition for a surface layer, and an extruder for a surface layer. The mixture is melt-kneaded, a hollow portion is formed in the base material through a multilayer multi-die, and the skin layers are united so as to integrally and very thinly coat the surface of the base material, and are co-extruded from a die. The melt-extruded molded body can be engaged with a forming die as necessary to improve the dimensional accuracy of the molded body.

The base material is formed of an outer skin portion and a plurality of ribs connecting the outer skin portion, and a portion surrounded by the outer skin portion and the rib is a hollow portion. The surface layer may be provided on the entire surface of the molded product or only on a part of the surface exposed to the outside of the molded product according to the use of the resin extrusion molded product. The thickness of the surface layer is not particularly limited as long as it is a thickness sufficient to cover the substrate, but it is generally preferable that the surface layer is provided with a thickness of 0.05 to 3 mm. On the other hand, the dimensions of the substrate are not particularly limited, but generally the thickness is 1 to 30.
It is preferably about mm.

In FIG. 1 showing an example of such a molded product, a molded product 1 is composed of a base material 2 and a surface layer 3 covering the entire surface of the base material 2. A plurality of ribs 5 are connected to each other, and have a hollow portion 6 surrounded by the outer skin portion and the ribs.

[0042]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.

The materials used in the following examples are as follows. (1) Thermoplastic resin ABS resin Melt flow rate (JIS K7210) 2 g /
10 minutes Polypropylene (PP) Melt flow rate (JIS K7210) 4g /
10 minutes (2) Wood flour Wood flour # 1 Average particle size 100 to 150 μm Wood flour # 2 Average particle size 150 to 500 μm (3) Processing aid Molecular weight (Mw) 2,000,000 (4) Colored pellet ABS resin (Melt flow rate) (JIS K 721
0) 2 g / 10 min) 100 parts by weight of colorant (brown) 5
A part by weight was added, and the mixture was formed into a pellet by a granulator.

The measurement and evaluation were performed as follows. (1) Deflection A molded body was placed on a support provided at an interval of 500 mm, and the amount of displacement when a 2 kg load was applied to the center of the placed molded body was measured. (2) Appearance characteristics The following criteria were used to evaluate the surface shape of the extrudate. ：: No surface irregularities, excellent aesthetic appearance ×: Rough surface, no aesthetic appearance

Example 1 100 parts by weight of ABS resin
120 parts by weight of wood flour # 1 and 3 parts by weight of a processing aid were dry-blended at room temperature for 20 minutes, supplied to a main extruder for a substrate, and melt-kneaded. The cylinder temperature of the main extruder is 15
0-180 ° C, the L / D of the screw was 25. On the other hand, 5 parts by weight of a colored pellet was supplied to 100 parts by weight of an ABS resin to a sub-extruder for a surface layer and melt-kneaded. The cylinder temperature of the sub-extruder was 150 to 180 ° C, and the L / D of the screw was 22. Molten resin flow from the main extruder;
The molten resin flow from the sub-extruder was joined in a multilayer multiple die, co-extrusion was performed, and the co-extruded product was passed through a forming mold to provide a hollow layer and a surface layer having a grain pattern. It was molded into a resin extrusion. The thickness of the surface layer is 3
It was 00 μm. The temperature of the die head was 190 ° C. and the temperature of the forming mold was 30 ° C. Table 1 shows the obtained results. The obtained resin molded article had a small amount of deflection, and was excellent in weight reduction and appearance characteristics.

Dry blending of 120 parts by weight of wood flour # 1 and 3 parts by weight of a processing aid with 100 parts by weight of a polypropylene resin at room temperature for 20 minutes was carried out and melt-kneaded by supplying to a main extruder for a substrate. . The cylinder temperature of the main extruder is 150
~ 180 ° C, the L / D of the screw was 25. On the other hand, wood flour # 12 was added to 100 parts by weight of polypropylene resin.
0 parts by weight and 5 parts by weight of a processing aid were dry-blended at room temperature for 20 minutes, supplied to a sub-extruder for a surface layer, and melt-kneaded. The cylinder temperature of the sub-extruder is 150 to 180
° C and the screw L / D was 22. The molten resin flow from the main extruder and the molten resin flow from the sub-extruder are joined in a multi-layer die, co-extrusion is performed, and the co-extruded product is passed through a forming mold to form a hollow portion. And molded into a resin molded article having a wood-skinned surface layer. The thickness of the surface layer was 500 μm. The temperature of the die head is 190
C. and the temperature of the forming mold were 30.degree. Table 1 shows the obtained results. The obtained resin molded article had a small amount of deflection, and was excellent in weight reduction and appearance characteristics.

Example 3 In Example 2, wood powder # 1 was used instead of 120 parts by weight of wood powder # 1 in the resin composition for a base material.
A resin molded body was produced in the same manner as in Example 2 except that 1200 parts by weight was used. Table 1 shows the obtained results. The obtained resin molded article had a small amount of deflection, and was excellent in weight reduction and appearance characteristics.

Example 4 In Example 2, wood flour # 1 was used instead of 120 parts by weight of wood flour # 1 in the resin composition for a base material.
A resin molded product was produced in the same manner as in Example 2 except that 200 parts by weight was used. Table 1 shows the obtained results. The obtained resin molded article had a small amount of deflection, and was excellent in weight reduction and appearance characteristics.

Comparative Example 1 A resin molded article was produced in the same manner as in Example 1, except that no hollow portion was formed. Table 1 shows the obtained results. The amount of deflection of the obtained resin molded article was large, and the weight reduction was unsatisfactory.

Comparative Example 2 A resin molded product was produced in the same manner as in Example 4 except that no hollow portion was formed and the surface layer resin composition was not coextruded. Table 1 shows the obtained results. The amount of deflection of the obtained resin molded article was large, and the weight reduction and appearance characteristics were unsatisfactory.

[0051]

[Table 1]

[0052]

According to the present invention, in a resin extruded product comprising a substrate and a surface layer, the substrate is made of a thermoplastic resin 1
A hollow portion is formed by extrusion molding, comprising a resin composition containing 0 to 80% by weight and 90 to 20% by weight of wood flour;
By forming the surface layer from the thermoplastic resin having compatibility with the resin of the base material and having a thickness sufficient to cover the base material, it has a reduced linear expansion coefficient and improved rigidity, and is used for filling wood powder. The accompanying deterioration in moisture absorption, weather resistance, and appearance characteristics is eliminated, and a resin molded article with improved texture can be provided by imparting a woodgrain tone.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a resin extruded product of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molded body 2 Base material 3 Surface layer 4 Outer skin part 5 Rib 6 Hollow part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // B29K 1:00 B29K 1:00 B29L 22:00 B29L 22:00 31:60 31:60 F term ( reference) 4F071 AA01 AA15 AA20 AA21 AA22 AA28 AA43 AA48 AA50 AA54 AA73 AF32 BB06 BC04 4F207 AA01 AA11 AA13 AB07 AB11 AC01 AF08 AG03 AG07 AH46 KA01 KA17 KL65 4J002 AA00X AB01W BB03X BB06X BB07X BB12X BB15X BB16X BC03X BC04X BG043 BG053 BN15X CF00X CG00X CH07X CL00X FD02 FD03 FD17 FD32

Claims (7)

[Claims] 1. A resin extruded product comprising a base material and a surface layer, wherein the base material is 10 to 80% by weight of a thermoplastic resin.
And a resin composition containing 90 to 20% by weight of wood flour,
And a hollow portion is formed by extrusion molding, and the surface layer is formed with a thickness sufficient to conceal the base material from a thermoplastic resin compatible with the resin of the base material, and has excellent appearance characteristics characterized by the above-mentioned. Extruded resin body. 2. The extruded resin article according to claim 1, wherein the base material and the surface layer are formed by co-extrusion molding. 3. The resin extruded product according to claim 1, wherein the wood powder of the base material has a particle size of 50 to 1000 μm. 4. The surface layer is a mixture of a thermoplastic resin compatible with the base material and a colored pellet obtained by coloring a resin of the same or a different kind.
The resin extruded product according to any one of the above. 5. The resin extruded product according to claim 1, wherein the surface layer contains less than 50% by weight of wood flour based on the composition. 6. The resin extruded product according to claim 1, wherein the surface layer is provided over the entire circumference of the base material. 7. The resin extruded product according to claim 1, wherein the surface layer is provided with a thickness of 0.05 to 3 mm.