JPH0952229A - Manufacture of woody product and the woody product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to simply obtain a pattern near a desired natural tree and to totally shorten the manufacturing time of a final molding by shortening the manufacturing time of a pellet. SOLUTION: The method for manufacturing a woody product comprises the steps of mixing pellet raw material capable of being formed in combination of solid particles, pigment and resin, melting it, molding it to manufacture a plurality of types of pellets having different combinations of the raw materials, melting the plurality of types of pellets, and molding it in a desired shape by extrusion molding or injection molding after or simultaneously upon melting. At least one of the plurality of type of pellets is formed by mixing the solid particles, and at least one is formed without mixing the solid particles.

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 molded product having a woody appearance and its product.

[0002]

2. Description of the Related Art As a technique related to the present invention, PCT
JP94 / 00351 (International publication number; WO94 /
The technology of "cellulosic fine powder particles, wood-like molded products and wood-like products" described in No. 20280) 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. To make fixed particles, and mix the fixed particles with resin and pigment,
Then, it is melted, and thereafter or simultaneously with melting, molded into a desired shape by extrusion molding or injection molding. Then, it is possible to provide a method of manufacturing a wood-like product and a wood-like product having a pattern very close to the grain of a natural tree on the surface and having a feeling such as a touch feeling similar to that of a natural tree.

A more detailed description will be given. Fixed particles formed by fixing surface particles having a smaller diameter and harder than the powder particles on the outer peripheral surface of the powder particles are mixed with resin and pigment, and melted, and then extrusion molding or injection molding is performed at the same time or at the same time as melting. When molding to a desired shape, there are roughly two types of molding methods.

As a first molding method, fixed particles and a powder compound in which a resin and a pigment are appropriately selected and mixed are formed, and the powder compound is melted and molded into a desired shape by extrusion molding or injection molding. It is a molding method. Further, as the second molding method, first, a resin and a pigment are appropriately selected and fixed particles are mixed and melted, and the melted product is extruded to form pellets, and when the final molded product is molded, This is a molding method in which the pellets are melted and extrusion-molded or injection-molded.

The molding method in which the powder compound is melted and molded has an advantage that the heat energy and time required for melting can be reduced as compared with the case of using pellets. On the other hand, the molding method of melting and molding the pellets is
Pellets are less likely to absorb moisture than compounds, so the dehydration process before molding is less time-consuming, and since they do not scatter like powder, they are easy to handle.

[0006] Recently, in order to prevent the deterioration of the working environment due to the scattering of powder that occurs when a powder compound is used, it has become more and more popular to employ a means of forming pellets and then performing final molding.

[0007]

By the way, in order to show a pattern close to the grain of natural wood on the surface of the final molded product, it is easier to obtain a desired pattern by using two or more kinds of pigments. It has been found out through repeated experiments. Furthermore, it has been found that a pattern closer to natural wood grain can be easily expressed by using two or more types of pellets containing different pigments, rather than including two or more types of pigments in the same pellet. In addition, it is better to use two or more types of pellets containing different pigments.
Since a means of changing the mixing ratio of them can be used, it is easy to finely control the color tone.

On the other hand, when the fixed particles obtained by processing the cellulosic material are mixed with the resin in forming the pellets before the final molding, the flowability is worse than that in the case where the pellets are not mixed. It wasn't very efficient. The problem to be solved by the present invention is to provide a technique capable of easily obtaining a desired pattern close to natural wood, and further shortening the production time of pellets to shorten the production time of the final molded product in total. To provide.

An object of the present invention is to provide a method for producing a wood-like product which can improve the production efficiency of the final molded product by shortening the production time of pellets. Further, an object of the invention as set forth in claim 2 is to provide a method for producing a woody product which can easily obtain a desired pattern close to natural wood.

It is another object of the present invention to provide a wood-like product which can improve the production efficiency of the final molded product by shortening the production time of pellets.

[0011]

SUMMARY OF THE INVENTION The present invention is to achieve the above object. In the method for producing a wood-like product according to claim 1, first, a pulverized powder obtained by pulverizing a cellulosic material is subjected to a grinding treatment to increase the bulk specific gravity on the outer peripheral surface of the powder, and Multiple types of pellet raw materials with different combinations of pellet raw materials that can be formed by fixing small diameter and hard surface grains to form fixed grains and combining the fixed grains with pigment and resin. Is produced, and a plurality of types of the pellets are melted, and after or at the same time as the melting, the pellets are molded into a desired shape by extrusion molding or injection molding. At least one of the plurality of types of pellets is formed by mixing fixed particles, and at least one is formed without mixing fixed particles.

The "cellulosic material" referred to here includes not only natural wood but also sawdust, rice straw, bacas and the like. "resin"
The term “hard” includes a hard resin and a soft resin, and examples thereof include a vinyl chloride resin, a foamed vinyl chloride resin, a polyethylene resin, a polypropylene resin, a phenol resin, a urethane resin, a polyurethane resin, an ABS resin, and a polystyrene resin.

"Surface grains" are metallic materials such as titanium oxide, ferrite, aluminum, nickel and silver, or non-metallic materials such as ceramics. As a technique for “forming a resin into pellets”, a conventionally known means of melting a material such as powder or solid and extruding it into a string shape from a porous circular nozzle and cutting it is used.

In the case of pellets formed by mixing fixed particles, the ratio of the fixed particles mixed with the resin to the whole is 30.
I try not to exceed the weight percent. This is because the fluidity at the time of molding is deteriorated, and there is a problem in molding. What is a "pigment"?
Colored pigments such as iron oxide, cadmium yellow,
It is an inorganic pigment such as carbon black or an organic pigment.

The method for manufacturing a wood-like product according to the first aspect of the invention has the following operation. First, the cellulose material is crushed to obtain crushed powder. Next, the crushed powder is ground to increase the bulk specific gravity and obtain powder particles. Next, surface grains are fixed to the powder grains to obtain fixed grains. Next, the fixed particles, the pigment, and the resin are combined into a pellet raw material, and the pellet raw materials are mixed, melted, and molded to produce a plurality of types of pellets having different combinations of pellet raw materials. Here, at least one of a plurality of types of pellets uses a pellet raw material in which fixed particles are not mixed. The production of the pellets is simpler in melting and mixing than the production of pellets from a pellet raw material in which fixed particles are mixed, and can be easily produced. Therefore, the labor required to manufacture all the pellets can be reduced.

Finally, the plurality of types of pellets are melted and, after or at the same time as the melting, are molded into a desired shape by extrusion molding or injection molding to obtain a final woody product. The method for producing a wood-like product according to claim 2 is a technical limitation of the method for producing a wood-like product according to claim 1, and the pigments include a plurality of types of pigment groups having different coloring properties. It is characterized in that it is formed so that two or more pigment groups are not mixed in one pellet raw material.

The term "pigment group" as used herein is meant to include not only a group formed of a plurality of types of pigments but also a group of one type of pigment. The method for manufacturing a wood-like product according to claim 2 is
Unlike the method for manufacturing a wood-like product according to claim 1,
It works as follows.

First, since a plurality of types of pigment groups are used and the pigment groups are formed as separate pellets, a desired pattern can be easily obtained, and a pattern close to natural grain can be easily obtained. Can be revealed.
Further, by using two or more types of pellets containing different pigments, a means of changing the mixing ratio of them can be used, so that delicate control of the color tone can be easily performed.

In the woody product according to claim 3, the outer peripheral surface of the powder particles having a bulk specific gravity increased by grinding the ground powder obtained by crushing the cellulosic material and having a smaller diameter than the powder particles. And fixed surface particles are fixed to form fixed particles, and the pellet raw materials that can be formed by combining the fixed particles with the pigment and resin are mixed, melted, and molded. It is a wood-like product that is manufactured by melting a plurality of types of pellets and molding them into a desired shape by extrusion molding or injection molding after or simultaneously with melting, and at least one of the plurality of types of pellets is fixed. While mixing and forming grains,
At least one of them is characterized by being formed without mixing fixed grains.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail based on the embodiments of the invention and the drawings. The drawings used here are FIGS. 1 to 5. FIG. 1 is a conceptual diagram showing a first embodiment of the present invention. FIG.
It is a conceptual diagram for showing a second embodiment of the present invention.
FIG. 3 is a conceptual diagram showing a third embodiment of the present invention. FIG. 4 is a conceptual diagram showing a fourth embodiment of the present invention. FIG. 5 is a conceptual diagram showing a fifth embodiment of the present invention.

In the first to fifth embodiments, first,
Form fixed grains. That is, a crushed powder obtained by crushing a cellulosic material is ground to form a fixed particle by fixing a surface particle having a smaller diameter and harder than the powder particle on the outer peripheral surface of the powder particle having an increased bulk specific gravity. . In addition, the fixed granules are manufactured by PCT JP
94/00351 (International Publication Number; WO94 / 202
The method disclosed in No. 80) can be used.
Therefore, detailed description is omitted in this embodiment.

Next, a pellet raw material is formed by using the fixed particles, the pigment and the resin. 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 chloride resin, polyethylene resin, polypropylene resin are particularly preferable. It was 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 building material such as a handrail for a handrail, and a hard resin is used when it is used as a member such as a window sash that requires strength.

As the pigment used here, one kind or several kinds are selected from inorganic pigments such as iron oxide, cadmium yellow, carbon black and the like, and organic pigments in accordance with the desired shade of the final molded product. , Forming a first pigment group and a second pigment group.
In the first group and the second group, the mixing ratio may be different in addition to the case where the types of pigments are made different. To approximate the pattern of a wood-like molded article that is finally molded using pellets formed containing a first pigment group and pellets formed containing a second pigment group to natural wood I wish I could.

Specifically, the first pigment group is
The yellow, red, and black pigments were mixed in the group, and the second pigment group was a mixture of red and black pigments. The manufacturing method after the pellet raw material is different in the first to fifth embodiments. First, the first embodiment will be described. In the first embodiment,
Three types of pellets are manufactured. The first pellets are formed from a resin and a second pigment group, the second pellets are formed from a resin and fixed particles, and the third pellets are formed from a resin and a first pigment group. As a specific method for producing pellets, for example, the mixture is melted, extruded in a string shape from a perforated circular nozzle, and cut to produce. Doing so makes it easier to absorb moisture during transportation and storage, making it easier to maintain the same quality and convenient.

Since the fixed pellets are not contained in the first pellet, the melting can be performed quickly, and the pellet can be manufactured more smoothly than the second pellet and the third pellet. Also,
It is easy to replace the residue inside the machine. As a whole,
Compared to the case where fixed pellets are contained in all three types of pellets, the time required to produce all three types of pellets is shorter.

There is a limit to the mixing ratio of the fixed particles contained in the second pellet and the third pellet. The practical range of the mixing ratio of the fixed particles is about 10 to 50% by weight with respect to one pellet. This is because if the fixed grain content is 10% by weight or less, the wood texture will be lost from the final wood-like product even if the weight ratio of other pellets is reduced. This is because the liquidity becomes poor at.

The practical range of the compounding ratio of the pigment to the resin in the first pellet and the third pellet is about 0.1 to 30% by weight for each pellet.
This is because if the amount is 30% by weight or more, the fluidity is deteriorated during the molding of pellets. The ratio of both pellets, or in addition to that, the ratio of the second pellets to the whole, is made different depending on whether the shade of the final wood-like product is brownish or black. By means of changing the mixing ratio of the first pellets and the third pellets, delicate control of the color tone can be easily performed.

The mixing ratio of the first pellets, the second pellets, and the third pellets varies depending on the wood-like product to be finally molded, and has a wide range, but the mixing ratio of the fixed grains in the whole three types of pellets is large. The higher the number, the more the wood quality of the final wood-like product. There is a limit on the mixing ratio of fixed grains to the final woody product. The relationship is, by weight ratio, pellets without fixed particles: pellets with fixed particles = first pellet: (second pellet + third pellet) = 30:70 to 99: 1. This is because the minimum amount of fixed particles is determined in order to bring out the wood texture, and the maximum amount of fixed particles is determined in order to maintain the fluidity during the final molding of the woody product.

Based on the resin, the three types of pellets contain a mixture with respect to the resin,
Since the type and mixing ratio of the mixture are different from each other, the melting temperature is also different. When melting three types of pellets, the molding temperature is set in advance according to the pellet having the lowest melting temperature, and the molding time is also set according to the pellet. Then, only the pellets are normally melted and uniformly flow in the molding direction. On the other hand, the other pellets do not have a sufficiently molten state, and therefore flow poorly and become non-uniform. Since the flow is poor and it becomes non-uniform, if the pigment is contained in the other pellets, the pigment naturally does not flow evenly, and the product obtained by the final molding has the internal and surface layers. Since the colored portions due to the pigment are unevenly scattered, uneven coloring occurs in the colored portions in the surface layer portion of the molded product, and the texture becomes close to a natural grain pattern.

In order to change the melting temperature, a method of adding a known additive or replacing the resin grade with a resin having a high melting temperature may be used. Next, the second embodiment will be described focusing on the differences from the first embodiment. Even in the second embodiment, three types of pellets are manufactured. The first pellets are made of resin only, the second pellets are made of resin and a second pigment group, and the third pellets are made of resin and fixed particles.

The feature of this second embodiment is that the color of the final woody product can be adjusted to be light. Depending on the mixing ratio of the three types of pellets, it is possible to give a transparent feeling. Next, the third embodiment will be described focusing on the differences from the first embodiment.

Also in the third embodiment, three types of pellets are manufactured. The first pellets are formed only from the resin, the second pellets are formed from the resin and the second pigment group, and the third pellets are formed from the resin, the fixed particles and the first pigment group. The feature of the third embodiment is also that the color of the final woody product can be adjusted to be light, and a transparent feeling can be provided depending on the compounding ratio of the three types of pellets.

Next, the fourth embodiment will be described focusing on the differences from the first embodiment. In the fourth embodiment, four types of pellets are manufactured. The first pellet is formed only from the resin, the second pellet is formed from the resin and the group of the second pigment, the third pellet is formed from the resin and the fixed particles, and the fourth pellet is the resin and the first pigment. It is formed from a group of.

The feature of the fourth embodiment is that it is easy to study the mixing ratio of the fixed particles and the pigment. This is because each of the second pellet, the third pellet, and the fourth pellet contains one each. Next, the fifth embodiment will be described focusing on the differences from the first embodiment.

Even in the fifth embodiment, four types of pellets are manufactured. The first pellet is formed only from the resin, the second pellet is formed from the resin and the fixed particles, the third pellet is formed from the resin, the fixed particles and the group of the first pigment, and the fourth pellet is fixed to the resin. It is formed from grains and a second group of pigments. The feature of this fifth embodiment is that a design very close to a real tree can be made. The good and bad fluidity of the resin is mixed, and the parts with different hues are mixed,
Complex patterns and patterns are likely to appear. Further, since the pellet formed of only the resin is inexpensive, the manufacturing cost can be reduced by using the pellet.

[0036]

According to the first aspect of the present invention, it is possible to provide a method for producing a wood-like product which can improve the production efficiency of the final molded product by shortening the production time of pellets. Further, according to the invention described in claim 2, it is possible to further provide a method for producing a wood-like product capable of easily obtaining a pattern close to a desired natural tree.

Further, according to the invention described in claim 3, it is possible to provide a woody product which can improve the production efficiency of the final molded product by shortening the production time of pellets and the like.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a first embodiment of the present invention.

FIG. 2 is a conceptual diagram showing a second embodiment of the present invention.

FIG. 3 is a conceptual diagram showing a third embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a fourth embodiment of the present invention.

FIG. 5 is a conceptual diagram showing a fifth embodiment of the present invention.

Claims (3)

[Claims] 1. A fixed particle in which a surface particle having a smaller diameter and is harder than the powder particle is fixed to the outer peripheral surface of the powder particle having a bulk specific gravity increased by grinding the powder obtained by crushing a cellulose material. The pellet raw material that can be formed by combining the fixed particles, the pigment, and the resin is mixed, melted, and molded to produce a plurality of types of pellets having different combinations of pellet raw materials, and the plurality of types of pellets are manufactured. A method for producing a wood-like product, which comprises melting, and after or simultaneously with melting, a desired shape by extrusion molding or injection molding, wherein at least one of a plurality of types of pellets is formed by mixing fixed particles. At the same time, at least one of them is formed without mixing fixed grains. 2. The wood-like material according to claim 1, wherein a plurality of kinds of pigment groups having different coloring properties are formed, and two or more pigment groups are not mixed in one pellet raw material. Product manufacturing method. 3. Fixed granules, in which surface granules having a smaller diameter and harder than the powder granules are fixed to the outer peripheral surface of the powder granules obtained by grinding the cellulose material to increase the bulk specific gravity by grinding. The pellet raw material that can be formed by combining the fixed particles, the pigment, and the resin is mixed, melted, and molded to produce a plurality of types of pellets having different combinations of pellet raw materials, and the plurality of types of pellets are manufactured. It is a wood-like product that is melted and, after or simultaneously with melting, is molded into a desired shape by extrusion molding or injection molding, and at least one of a plurality of types of pellets is formed by mixing fixed particles, and at least One is a wood-like product characterized by being formed without mixing fixed grains.