JPH08207111A - Woody product and production thereof - Google Patents

Abstract

PURPOSE: To produce a molded product having patterns extremely near to natural grain. CONSTITUTION: An inner layer 20 is formed using an inner resin layer 21 formed by the extrusion molding of a resin similar to at least mass among physical properties of natural wood. Particles having high bulk specific density are produced by grinding a ground power obtained by grinding a cellulose material and surface particles smaller and harder than the particles are fixed to the outer peripheral surfaces of the particles to obtain fixed particles. A resin and pigment are mixed with the fixed particles and the resulting mixture is melted to be extruded to the outside of the inner layer 20 to form a surface layer 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a wood-like product and a wood-like product, and more particularly, it has a pattern very close to natural wood grain on the surface even when a molded product with a large cross section is extruded. The present invention relates to a technology capable of manufacturing a molded product.

[0002]

2. Description of the Related Art As a technique related to the present invention, a PC
T JP94 / 00351 (International Publication Number; WO94
/ 20280) "Cellulose-based fine powder particles,
The technology of "wood-like molded product and wood-like product" will be briefly described. The pulverized powder obtained by pulverizing the cellulose material as a raw material is ground to obtain powder particles having an increased bulk specific gravity, and fixed on the outer peripheral surface of the powder particles, surface particles having a smaller diameter and a hardness smaller than the powder particles. Fixed particles are obtained by mixing the resin and the pigment with the fixed particles, melting the fixed particles, and thereafter or simultaneously with melting, forming into a desired shape by extrusion molding or injection molding. Then, it is possible to provide a method for producing a wood-like product and a wood-like product which have a pattern extremely close to the grain of a natural tree on the surface and have a texture such as a touch feeling similar to that of the natural tree.

[0003]

By the way, when attention is paid to a cross section in extrusion molding and the thickness of the cross section is large, a wood grain pattern often does not appear sufficiently. It is considered that this is because, when the thickness of the cross section is large, the stirring speed and the extrusion speed immediately before molding are high, and thus the pigments are uniformly mixed and flow during molding.

The problem to be solved by the present invention is to obtain a wood-like product having a pattern very close to the grain of a natural tree on the surface and having a texture such as a touch feeling similar to that of a natural tree. It is an object of the present invention to provide a technique capable of producing a molded product having a pattern extremely similar to natural wood grain on the surface even when a large molded product is extrusion molded. here,
It is an object of the invention as set forth in claim 1 to provide a manufacturing method capable of manufacturing a molded product having a pattern extremely close to a natural grain on the surface even when a molded product having a large cross section is extrusion molded.

Another object of the present invention is to provide a molded product having a pattern very similar to natural grain on the surface even when a molded product having a large cross section is extrusion molded.

[0006]

[Means for Solving the Problems] The following inventions are provided as means for achieving the above object. The method for producing a wood-like product according to claim 1, wherein the surface layer (10) forming the outer surface of the molded article and the inner layer (2) forming the inside of the surface layer (10).
(0) and a method for producing a molded article formed by including an inner layer (20) using an inner resin layer (21) obtained by extrusion-molding a resin having at least a similar mass of physical properties of natural wood. The pulverized powder obtained by crushing the cellulose material is ground to obtain powder particles having an increased bulk specific gravity, and fixed to the outer peripheral surface of the powder particles, the surface particles having a smaller diameter than the powder particles and being harder. This is characterized in that fixed particles are obtained by mixing a resin and a pigment into the fixed particles and melting them, and the surface layer (10) is extruded to the outside of the inner layer (20).

Here, the thickness of the "surface layer" is 0.1 mm or more and 5 mm or less. This is because if the thickness is less than 0.1 mm, the texture such as touch will be different from that of natural wood, and if it is greater than 5 mm, the grain pattern will not sufficiently appear. The total thickness of the "surface layer" and the "inner layer" is at least 2 mm or more. This is because if the thickness is less than 2 mm, the texture such as the feel will be different from that of natural wood.

The "inner layer" may be formed only from the "inner resin layer", or other material (for example, aluminum alloy).
The “internal resin layer” may be fixed and formed on the outer side of the core material formed in. The "cellulosic material" includes sawdust, rice straw, bacas, etc. in addition to natural wood. The "resin" includes hard resin and soft resin, and examples thereof include vinyl chloride resin, foamed vinyl chloride resin, polyethylene resin, polypropylene resin, phenol resin, urethane resin, polyurethane resin, ABS resin, polystyrene resin and the like.

"Surface grains" are metallic materials such as titanium oxide, ferrite, aluminum, nickel and silver, or non-metallic materials such as ceramics. The "pigment" is a colored pigment, and is, for example, an inorganic pigment such as iron oxide, cadmium yellow, or carbon black, or an organic pigment.
The above terms have the same meanings in the following claims.

The woody product according to claim 2 is formed by including a surface layer (10) forming an outer surface of the molded article and an inner layer (20) forming the inside of the surface layer (10). A molded article,
The inner layer (20) is an inner resin layer (21) formed by extruding a resin whose physical properties are at least similar to those of natural wood.
The surface layer (10) is a powder particle obtained by grinding a pulverized powder obtained by crushing a cellulose material to increase the bulk specific gravity, and the outer peripheral surface of the powder particle has a smaller diameter than the powder particle. In addition, the hard surface particles are fixed to form fixed particles, and the fixed particles are mixed with a resin and a pigment and melted to be molded, and the inner resin layer (2
It is characterized by being formed by being fixed to the outside of 1).

[0011]

[Working] The method for producing a woody product according to claim 1 has the following actions. That is, since the ratio of the cross-sectional area occupied by the surface layer (10) is smaller than the cross-sectional area of the final molded product, the stirring speed and extrusion speed immediately before molding are higher than when all the cross-sections of the final molded product are extruded uniformly. If the mixing speed is small and the stirring speed or extrusion speed immediately before molding is small, the pigment during molding flows without being mixed uniformly.
Therefore, the pigment flows irregularly, and the surface layer (10) has a pattern very close to the grain of natural wood on the surface of the molded product.

Further, the inner layer (20) is provided with an inner resin layer (21) formed by extruding a resin whose physical properties are at least similar among the physical properties of natural wood. The texture is similar to that of natural wood. The woody product according to claim 2 has the following actions. That is, the surface layer (10) contains a pigment and fixed particles containing cellulose in a thermoplastic resin, and has a pattern very close to the grain of natural wood on the surface of the molded product.

Further, the inner layer (20) is provided with an inner resin layer (21) formed by extruding a thermoplastic resin having at least a similar physical weight among the physical properties of natural wood, and has a texture such as touch. It becomes a wood-like product that is close to natural wood.

[0014]

Embodiments of the present invention will now be described with reference to the embodiments and the drawings.
This will be described in more detail. The drawing used here is FIG. 1 which is a perspective view showing an embodiment of the present invention. The present embodiment is a molded product formed by including a surface layer 10 forming the outer surface of the molded product and an inner layer 20 forming the inside of the surface layer 10, and a method for manufacturing the molded product.

First, the aluminum alloy pipe 22 is formed by extrusion molding. Then, a resin whose mass and hardness are very close to those of natural wood, for example, hard polyvinyl chloride is extruded on the outer surface of the extruded pipe 22. The resin layer is referred to as an internal resin layer 21. The tubular body formed by the internal resin layer 21 and the pipe 22 is referred to as the internal layer 20.

On the other hand, the pulverized powder obtained by pulverizing the cellulosic material is ground to obtain powder particles having an increased bulk specific gravity, and surface particles having a diameter smaller than the powder particles and hard surface particles are provided on the outer peripheral surface of the powder particles. Fix to make fixed grains. In addition, this fixed grain is manufactured by PCT
JP94 / 00351 (International Publication Number; WO94 / 2
No. 0280) can be used. Therefore, detailed description is omitted in this embodiment.

Next, a wood-like forming seed material is formed using the fixed grains. That is, a wood-like formation seed material in which a pigment and fixed particles are mixed with a resin is formed. This wood-like forming seed material may be a wood-like forming compound obtained by simply mixing resin powder, pigment powder and fixed particles, but the mixture is melted and extruded into a string shape from a perforated circular nozzle to be cut into wood. The shaped pellets may be prepared and used. This is convenient because it does not absorb moisture during transportation and storage, and it is easy to maintain the same quality. on the other hand,
When the wood-like formation compound is used, the time and energy required for melting are smaller than those of the wood-like formation pellets.

As the resin used here, for example, vinyl chloride resin, foamed vinyl chloride resin, polyethylene resin, polypropylene resin, phenol resin, urethane resin, polyurethane resin, ABS resin, polystyrene resin, etc. could be adopted, but Vinyl resin, polyethylene resin and polypropylene resin were suitable. The type of resin referred to here depends on the performance required for the finally desired molded product. For example, a hard foam resin is used when it is used as a construction material in a house such as a handrail, and a hard resin is used when it is used as a member requiring strength such as a window sash. In this example, foamable polyvinyl chloride was used to produce a handrail with a slightly soft feel.

The pigment used for the wood-like forming seed material is selected from one kind or several kinds of inorganic pigments such as iron oxide, cadmium yellow, and carbon black in accordance with the desired shade of the final molded product. To use. The wood-like forming seed material used in this example is a mixture of about 20% by weight of fixed particles and 1 to 30% by weight of a pigment in a resin. Here, the practical range of the mixing ratio of the fixed grains is about 10 to 50% by weight with respect to the whole wood-like forming seed material. This is because when the content of fixed particles is 10% by weight or less, the final molded product has no wood texture, and when it is 50% by weight or more, the fluidity at the time of molding becomes poor. Further, the practical range of the blending ratio of the pigment is about 0.1 to 30% by weight based on the whole wood-like forming seed material.

The wood-like forming seed material produced as described above is usually prepared in a plurality of kinds with different kinds of pigments, mixing ratio of fixed particles, etc., and two or more kinds are selected from them. Often mixed. This is because a wood grain pattern is created when a plurality of types of pigments are mixed. When selecting different types of wood-like forming seed material, it is more preferable to select such that the melting temperature of the other wood-like forming seed material is lower than the melting temperature of the other. When it was melted according to the low melting temperature and the flowability at the time of melting was made different, the pigment in the wood-like forming material seed material naturally did not flow evenly, and it was obtained by final molding. In the product, since the colored portions due to the pigment are unevenly scattered inside and on the surface layer portion, uneven coloring occurs in the colored portion in the surface layer portion of the molded product, and it becomes close to a natural grain pattern.

In order to change the melting temperature, it is possible to use a method in which a known additive is added or the grade of the resin is changed to one having a high melting temperature. Using the wood-like forming material seed material formed as described above, the surface layer 10 is extruded onto the outside of the internal resin layer 21 to form an extruded product. Then, the surface layer 10
Contains a fixed particle containing a pigment and cellulose in a thermoplastic resin, and has a pattern very close to the grain of natural wood on the surface of the molded product.

Here, the thickness of the "surface layer" is 0.1 mm or more and 5 mm or less. This is because if the thickness is less than 0.1 mm, the texture such as touch will be different from that of natural wood, and if it is greater than 5 mm, the grain pattern will not sufficiently appear. The total thickness of the "surface layer" and the "inner layer" is at least 2 mm or more. This is because if the thickness is less than 2 mm, the texture such as the feel will be different from that of natural wood.

Although not shown in detail, the resin forming the surface layer 10 and the resin forming the internal resin layer 21 are thermoplastic resins, and may be an extrusion molded product formed as described above. For example, if the extruded product is immersed in hot water and heat is applied and external force is applied from both sides so that the axial direction becomes a curve, bending is performed so that the axial direction of the extruded product becomes a curve. be able to. However, if the thickness of the “surface layer” is greater than 3 mm, bending is difficult to perform due to wrinkling, etc., so the thickness is set to 3 mm or less.

According to the above-mentioned embodiment, even when a molded product having a large cross section is extrusion molded, it is possible to provide a molded product having a pattern extremely close to a natural grain on the surface thereof. We were also able to provide the technology for bending. In addition, since the amount of fixed particles used, which requires a long manufacturing time and cost, can be reduced, the production efficiency is improved.

Further, since the inner layer 20 is formed of the inner resin layer 21 and the pipe 22 made of aluminum alloy, the strength of the pipe 22 is increased by the presence of the pipe 22, but the inner layer 20 is made of wood close to natural wood. It became a wood-like molded product with a color, texture and texture. In addition, in the above embodiment, the "inner layer 2
"0" is formed by the internal resin layer 21 and the pipe 22 made of an aluminum alloy, but may be formed only by the "internal resin layer".

[0026]

According to the invention as set forth in claim 1, there is provided a manufacturing method capable of producing a molded article having a pattern extremely close to a natural grain on the surface even when a molded article having a large cross section is extruded. I was able to. Further, according to the invention described in claim 2, it is possible to provide a molded article having a pattern extremely close to a natural grain on the surface even when a molded article having a large cross section is extrusion molded.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

10 Surface Layer 20 Internal Layer 21 Internal Resin Layer 22 Pipe

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location B32B 27/20 AZ // B29K 101: 00 B29L 9:00 23:00

Claims (2)

[Claims] 1. A method for producing a molded article, comprising: a surface layer forming an outer surface of the molded article; and an inner layer forming the inside of the surface layer. The inner layer is formed by using an inner resin layer obtained by extruding a resin having at least a similar mass, and the pulverized powder obtained by pulverizing the cellulose material is subjected to a grinding treatment to obtain powder particles having an increased bulk specific gravity. On the outer peripheral surface of the, fixed surface particles having a smaller diameter and harder than the powder particles are fixed particles, and the fixed particles are mixed with resin and pigment and melted, and the surface layer is extruded to the outside of the inner layer. A method for producing a wood-like product characterized by being molded. 2. A molded article comprising a surface layer forming an outer surface of the molded article and an inner layer forming the inside of the surface layer, wherein the inner layer has a physical property of natural wood. At least an internal resin layer formed by extruding a resin having an approximate mass is formed, and the surface layer is a powder particle obtained by grinding a pulverized powder obtained by crushing a cellulose material to increase bulk specific gravity, and the powder particle A surface grain having a smaller diameter and a harder surface than the powder grain is fixed to the outer peripheral surface of the to form a fixed grain, and the fixed grain is mixed with a resin and a pigment and melted to be molded, A wood-like product characterized by being fixed to and formed on.