JPH10264196A - Manufacture of woody molding and the molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a ball woody molding formed with a wood pattern by incorporating mica in surface particles, adding foaming agent and injection molding it. SOLUTION: Comminuted powder obtained by commenting cellulose material is ground, and hard surface particles having a smaller diameter than that of the powder are fixed to outer peripheries of the particles to form fixed particles. Here, as the cellulose material, saw chips of natural timber are used, and as the surface particles, mica and titanium oxide are used. Then, resin and pigment are mixed with the fixed particles to form a woody forming seed material. It is mixed with resin added with forming agent to form a molding material, and injection molded. As the resin, polypropylene resin is used, and as the pigment, carbon black is used. The molding material is formed by mixing base material and woody forming seed material, for example by each one type. At this time, when fluidity at the time of melting the seed material is lowered from that of the base material, it becomes similar to a natural woodgrain pattern. Eventually, it is coated with paint.

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 article having a woody appearance, such as various molded articles such as furniture in a house, interior parts of a vehicle, and the like, and a molded article thereof. Things.

[0002]

[Prior Art] PCT is a technique related to the present invention.
JP94 / 00351 (International publication number; WO94 /
No. 20280) will be briefly described with respect to the technology of “cellulose-based fine powder, method for producing wood-like molded article, and wood-like molded article”. The ground powder obtained by pulverizing the cellulose material as a raw material is subjected to a grinding treatment to obtain a powder particle having an increased bulk specific gravity, and a surface particle having a smaller diameter and harder than the powder particle is fixed to the outer peripheral surface of the powder particle. The fixed particles are mixed with a resin and a pigment and melted, and thereafter or simultaneously with the melting, formed into a desired shape by extrusion molding or injection molding.
Then, it is possible to provide a method for manufacturing a wood-like molded article and a wood-like molded article 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 a natural tree.

[0003]

By the way, in natural wood, there is a wood pattern called Tamaki. Tamaki is a woodgrain whose pattern color gradually changes depending on the viewing direction. However, this Tamaki pattern can be used in so-called wood plastic or PCT JP94 / 003.
No. 51 (International Publication No. WO94 / 20280) has not established a technique for realizing a "woody-like molded article production method using cellulosic fine particles and a woody-like molded article".

[0004] The problem to be solved by the present invention is to provide a technique of forming a wood pattern using a so-called wood plastic or "a method for producing a wood-like molded article using cellulose fine powder and a wood-like molded article". is there. Here, an object of the present invention described in claims 1, 2 and 4 is to provide a method of manufacturing a wood-like molded product having an oak pattern. It is another object of the present invention to provide a wood-like molded product having an tamagi pattern.

[0005]

SUMMARY OF THE INVENTION The present invention is to achieve the above object. (Claim 1) The invention according to claim 1 is to form fixed particles by fixing surface particles having a smaller diameter and harder than the ground powder on the outer peripheral surface of the ground powder obtained by grinding the cellulose material. In a method of manufacturing a wood-like molded article in which a resin and a pigment are mixed and melted in fixed grains, and then molded into a desired shape after or simultaneously with the melting, the surface grains contain mica, and are subjected to injection molding by adding a foaming agent. It is characterized by. In addition, the "cellulose material" mentioned here includes sawdust, rice straw, bacas and the like in addition to natural wood. In addition, the degree of pulverization of the pulverized powder can be changed from the degree used for ordinary wood plastic to
No. 4/00351 (International Publication Number; WO94 / 2028)
0) to very fine powders as described in
Shall be widely included. The same applies to other claims.

[0006] The "resin" includes a hard resin and a soft resin, such as a 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. The “surface particles” may be mica alone, or may be a mixture with a nonmetallic material such as titanium oxide, calcium carbonate, ferrite, aluminum, nickel, silver, or ceramic. The “pigment” is a colored pigment, for example, an inorganic pigment or an organic pigment such as iron oxide, cadmium yellow, or carbon black. The “foaming agent” varies depending on the resin used, the properties of the final molded product, and the like, but a foaming aid may be used as necessary. Further, as shown in a first embodiment described later, a resin containing a foaming agent may be mixed and molded in advance. The wood-like molded product obtained by the above-described manufacturing method is a high-grade molded product in which an oak pattern can be seen on the surface. Normally, a transparent coating is applied in order to protect the ball pattern on the surface of the molded product. For this coating, one that does not easily permeate into the molded product is used.

(Claim 2) The invention according to claim 2 is a technical limitation of the method for producing a woody molded product according to claim 1, wherein titanium oxide is contained in surface particles. It is characterized by. During the injection molding, the temperature of the molten material rises, so that the molded product may turn blackish. This is considered to be because the cellulose material contained in the melted material is burnt by heat. However, when titanium oxide is contained in the surface grains, it is possible to prevent the molded product from becoming dark. The ratio of titanium oxide contained in the surface particles was optimally in the range of 1 to 3% when the fixed particles composed of the powder particles and the surface particles were assumed to be 100% by weight. If it is less than 1%, the effect of preventing the molded product from becoming dark is small. On the other hand, if it is 3% or more, although the effect of preventing the molded product from being darkened is increased, the amount of mica is relatively reduced, and the Tamaki pattern is faint.
Therefore, 5% or less is preferable.

[0008] (Claim 3) The invention according to claim 3 is to form fixed particles by fixing a surface particle smaller in diameter and harder than the ground powder on the outer peripheral surface of the ground powder obtained by grinding the cellulose material. A resin and a pigment are mixed with the fixed particles, and the mixture is melted. The mica is included in the surface particles of the wood-like molded product to be molded into a desired shape, and a foaming agent is added thereto and injection molding is performed. . The wood-like molded product according to the present invention is a molded product with a high-class appearance, in which a Tamaki pattern can be seen on the surface.

(Claim 4) The invention according to claim 4 is to form fixed grains by fixing pearl pigment on the outer peripheral surface of the pulverized powder obtained by pulverizing a cellulose material, and mixing a resin with the fixed grains. A method for producing a wood-like molded article which is formed into a desired shape after or simultaneously with and after melting, characterized by injection molding with a foaming agent added. The wood-like molded product obtained by such a production method is a molded product with a high-class feel, in which an oak pattern can be seen on the surface.

(5) A pearl pigment is fixed on the outer peripheral surface of the pulverized powder obtained by pulverizing the cellulosic material to form fixed particles, and the fixed particles are mixed with a resin and melted. A wood-like molded product which is molded into a desired shape at the same time as melting, characterized by being injected with a foaming agent. The wood-like molded product according to the present invention is a molded product with a high-class appearance, in which a Tamaki pattern can be seen on the surface.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments and drawings. The drawings used here are FIG. 1 and FIG. 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. First,
A description will be given based on FIG. First, a fixed particle is formed by fixing a surface particle having a smaller diameter and a harder surface than the powder particle on the outer peripheral surface of the powder particle whose bulk specific gravity is increased by grinding treatment of a crushed powder obtained by crushing a cellulose material. . It is based on the technique of “cellulose-based fine particles, method for producing woody-like molded article and woody-like molded article” described in PCT JP94 / 00351 (International Publication Number: WO94 / 20280), and details thereof are omitted. In addition, even if the bulk specific gravity is not increased by the grinding treatment, the quality of the final molded product can be almost the same.

As the "cellulose material" used here, sawdust of natural wood was used. “Surface particles” are mica and titanium oxide, and in terms of% by weight,
Mica was 15% and titanium oxide was 1%. However, since titanium oxide is an expensive material, it may not be mixed unless it is very dark during molding. For the fixed grains, a resin and a pigment are mixed to form a wood-like seed material, and the wood-like seed material is mixed with a resin to which a foaming agent is added to form a molding material. Melt
Thereafter or simultaneously with the melting, the mixture is formed into a desired shape by injection molding. During molding, the same precautions as for injection molding when a foaming agent is mixed are observed. Basic precautions include attaching a check valve (shut-off nozzle) to prevent leakage of resin from the nozzle due to foaming pressure, and reducing the injection amount to facilitate foaming. As the “resin”, a polypropylene resin was used, as the “pigment”, a pigment such as carbon black was used, and as the “resin containing a foaming agent”, Polyslen EE-206 manufactured by Eiwa Chemical Industry Co., Ltd. was used. By using a foaming agent, the final molded product can be reduced in weight, and at the same time, shrinkage and warpage can be reduced, so that the dimensional accuracy can be improved and large-sized molded products can be molded. The "molded material" may be formed by mixing one type of each of the "base material" and the "woody-formed seed material". It can also be formed by mixing.

Normally, the base material and the wood-like seed material are formed in the form of pellets in advance. Furthermore, the wood-like forming material seed material has a fluidity at the time of melting,
The fluidity of the base material at the time of melting is set lower. Specifically, means such as adding various additives to one or both of them is used. Then, the pigment contained in the wood-like forming material seed material does not flow uniformly at the time of molding, so that the pattern appearing on the surface of the final molded product is close to a natural grain pattern. In the wood-like molded product according to this embodiment, so-called silver appears on the surface,
It is a molded product with a high-class feel that can see the Tamaki pattern. Then, in order to protect the surface of the molded product and at the same time to make the molded product look more beautiful, a transparent, hardly penetrating hard paint is applied. The molded product thus obtained is used for, for example, a picture frame, an outer frame of a luxury table clock, a dashboard of an automobile, and the like.

Next, differences between the second embodiment and the first embodiment will be described with reference to FIG. The difference from the first embodiment is that mica and titanium oxide were not used as surface particles using only pearl pigments,
And that no pigment was mixed during the formation of the woody seed material. Since pearl pigments are considerably more expensive than ordinary pigments, the final molded products are also more expensive. In the wood-like molded product according to this embodiment, so-called silver appears on the surface thereof, and a Tamaki pattern can be seen.
It becomes a molded product full of luxury. As the quality of the Tamaki pattern,
There is no significant difference from the first embodiment. Note that, in order to protect the surface on which the Tamaki pattern appears and make it look more beautiful, a paint that is hardly absorbed is applied, as in the first embodiment. In addition, if a paint that is absorbed is applied, the Tamaki pattern will be erased, which may have an adverse effect.

In the above embodiment, the degree of pulverization of the pulverized powder has been described as being at the level described in PCT JP94 / 00351 (International Publication No. WO94 / 20280). It is possible to provide a molded product of a wooden plastic that can see an Tamaki pattern even if it is used to a degree.

[0016]

According to the first, second and fourth aspects of the present invention, it is possible to provide a method for producing a wood-like molded product having an oak pattern. Further, according to the third and fifth aspects of the present invention, a wood-like molded product having an oak pattern can be provided.

[Brief description of the 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.

Claims (5)

[Claims] 1. A fixed particle is formed by fixing surface particles smaller in diameter and harder than the ground powder on the outer peripheral surface of the ground powder obtained by grinding the cellulose material, and a resin and a pigment are mixed with the fixed particles. A method for producing a wood-like molded article, wherein the surface grain contains mica, and a foaming agent is added thereto, followed by injection molding. Manufacturing method. 2. The method according to claim 1, wherein the surface particles contain titanium oxide. 3. A fixed particle is formed by fixing a surface particle smaller in diameter and harder than the ground powder on the outer peripheral surface of the ground powder obtained by grinding the cellulose material, and a resin and a pigment are mixed with the fixed particle. A wood-like molded product which is melted and molded into a desired shape, wherein mica is contained in surface particles, and a foaming agent is added thereto, followed by injection molding. 4. A fixed particle is formed by fixing a pearl pigment on the outer peripheral surface of a pulverized powder obtained by pulverizing a cellulose material, and a resin is mixed with the fixed particle and melted, and thereafter or simultaneously with melting. A method for producing a wood-like molded article to be molded into a desired shape, wherein a foaming agent is added and injection molding is performed. 5. A fixed particle is formed by fixing a pearl pigment on an outer peripheral surface of a pulverized powder obtained by pulverizing a cellulose material, and a resin is mixed with the fixed particle and melted, and thereafter or simultaneously with melting. What is claimed is: 1. A wood-like molded product which is formed into a desired shape, wherein a foaming agent is added and injection-molded.