KR20000015979A - Resin extrusion formed product and manufacturing method thereof - Google Patents

Abstract

PURPOSE: An extrusion formed product and its manufacturing method are provided to have a similar exterior as natural wood. CONSTITUTION: A glossy part for a glossy face is made from a resin material containing wood powder. The resin containing wood powder is composed of 20 to 40 parts of wood powder which has 20 mesh or less that 20 mesh of a particle size and 0.5 to 4 parts of an intrusion molded material from 100 parts of heat flexible resin. The glossy unit and wood powder make pulverized powder from a cellulose material, be powder and stick a surface particle smaller than the pulverized powder and higher hardness on the outer face of the pulverized powder.

Description

Resin Extruded Article and Manufacturing Method Thereof

Housing construction materials, in which extruded products of wood powder-containing resin materials are commonly used, are described below as related technologies.

Extrusions of synthetic resins have often been used for highly processed construction materials, such as door chassis, instead of wood made of natural wood. The material for this extruded article of synthetic resin is, for example, hard vinyl chloride resin mixed with tens of percent of wood powder. Extruded articles composed of the above-described materials can be previously formed into a predetermined shape by cutting the natural wood several times flat. Therefore, the processing step after the molding operation can be greatly reduced except that the molded article is cut with a saw or nailed, making construction very easy.

However, the novel articles according to the above-described techniques still have a number of problems in that their specific gravity is very large compared to that of wood and that they become very hard by forming an epidermal layer on the surface thereof so that the surface has no texture like wood. . Moreover, because of its low compatibility with vinyl acetate group adhesives or paints commonly used for wood, adhesion or painting with resins was difficult. Therefore, the use of this new article is limited.

The present invention relates to a technique for producing an extruded article of resin. More specifically, the present invention is characterized by mixing wood powder with a small amount of blow molding agent in the resin material for extrusion, and then removing the skin layer formed on the surface of the molded article.

It is therefore an object of the present invention to provide a technique for producing an extruded article having properties more similar to natural wood.

The defect of the extruded molded article of the wood powder-containing resin is solved by the present invention characterized by lowering the foaming degree of the molded article and removing the skin layer formed on the surface of the molded article. Foaming yields wood-like properties to this molded part by reducing its specific gravity. Moreover, the epidermal layer formed on this surface is so thin that it is easily removed by brushing.

(Explanation of claim 1)

The present invention according to claim 1 provides a molded article formed by extrusion molding of a resin, wherein at least a gloss forming a glossy surface is made of a wood powder-containing resin material in which the resin is mixed with wood powder; The wood powder-containing resin consists of 20 to 40 parts of wood powder having a particle size of 20 mesh or less in 100 parts of the thermoplastic resin and 0.5 to 4 parts of the blow molding agent; And the gloss surface is formed by removing the skin layer formed during extrusion.

The gloss portion shows a visible portion when a molded article of the resin formed by extrusion molding of the resin according to the present invention is brought into a situation in which its original function can be exhibited.

(Explanation of claim 2)

The invention according to claim 2 is provided to technically limit the invention according to claim 1, wherein the gloss portion is formed by monolithic extrusion with another part of the resin.

When the gloss portion and the other portions are made of different materials from each other, both portions are formed by monolithic extrusion.

(Explanation of claim 3)

The present invention according to claim 3 is provided to technically limit the invention according to claim 1 or 2, wherein the gloss portion and other portions are made of wood powder-containing resin material forming the gloss portion.

In this case, the gloss portion and the other portions are made of the same material, and can be manufactured by using a material whose whole constitutes the gloss portion.

(Explanation of claim 4)

The present invention according to claim 4 is characterized in that the powder of the wood powder in the wood powder-containing resin, which forms a gloss part, is pulverized by pulverizing cellulose material, and the outer surface of the pulverized powder has a particle size smaller than that of the pulverized powder. It is characterized by being prepared by the step of adhering surface particles having a high hardness.

Cellulose as described herein refers to natural wood as well as sugar squeeze tailings of sawdust, rice straw and sugar cane.

Resins include, for example, hard resins such as polyvinyl chloride resins, expanded polyvinyl chloride resins, polyethylene resins, polypropylene resins, phenolic resins, urethane resins, polyurethane resins, ABS resins and polystyrene resins. Soft type resins may also be used depending on the molded article required.

Surface particles correspond to titanium oxide, aluminum, nickel, silver, ferrite, thermoplastic resins or ceramics.

The proportion of wood powder to be mixed with the resin relative to the total molded article is controlled so that it is not more than 30% by weight since the molding process interferes with low fluidity during molding.

Pigments represent colored pigments, examples of which include inorganic pigments such as cadmium yellow, carbon black and iron oxides.

(Explanation of claim 5)

The present invention according to claim 5 comprises preparing a wood powder-containing resin material comprising 20 to 40 parts of a wood powder having a particle size of 20 mesh or less in 100 parts of a thermoplastic resin and 0.5 to 4 parts of a blow molding agent. It provides a method for producing a molded article formed by extrusion molding of a resin comprising a step of extruding a gloss forming at least a glossy surface using a wood powder-containing resin material, and removing the skin layer formed during the extrusion molding step. do.

Although a hard vinyl chloride resin having a low degree of foaming contains an air bubble in which an extruded article used as a resin is independently dispersed, an air bubble in a molded article according to the present invention is a wood powder connecting an air cell to a wood powder. It appears continuously because it is mixed with the resin. Therefore, the surface of the molded article is similar to the surface of the wooden article in texture and appearance because pores such as capillaries are exposed on the surface of the molded article after the skin layer is removed. When paint or adhesive is coated on this surface, the coating film adheres tightly to the surface because part of the coating film penetrates deep into the pores.

Blended in a mixer consists of 100 parts of hard vinyl chloride, 30 parts of wood powder with a particle size of 20 mesh or less, 1 part of blow molding agent (azodicarboxylic acid amide) and stabilizers, lubricants and reinforcing agents. 5 parts of each. This mixture is heated by conventional methods and placed on an extruder after cooling to form shaped articles of hard chloride resin having the desired shape with low degree of foaming. The skin layer formed on the surface of the molded article is then removed by a wire brush to obtain the final product.

This product has a specific gravity within 0.5 to 1.0 and thus has a similar appearance to natural wood. The surface of the molded part is similar to the surface of the wooden part in texture and appearance because pores such as continuous capillaries are exposed to the surface of the molded part after removal of the epidermal layer. When a paint or adhesive is coated on this surface, the adhesion strength to this surface is enhanced because the wedge effect is shown by partially penetrating the layer of adhesive or paint deep into these pores.

The molded article prepared as described above has a coefficient of thermal expansion of 1/2 to 1/3 times that of the conventional molded article. Therefore, the molded article according to the present invention is widely applicable because the molded article is not easily peeled off by temperature change when it is bonded on wood or metal.

When conventional resin products are used, the joints of the inner packing of the building are easily generated by thermal expansion, so that a structural method similar to that of natural wood is impossible, but the product according to the present invention has a good appearance without any gaps. Make it possible.

Accordingly, the present invention provides an extruded article having a similar appearance to natural wood and a method for producing the same.

Claims (5)

A molded article formed by extrusion of a resin, the molded article comprising at least a gloss portion forming a gloss surface made of a wood powder-containing resin material in which resin is mixed with wood powder; The wood powder containing resin consists of 20 to 40 parts of wood powder having a particle size of 20 mesh or less in 100 parts of the thermoplastic resin and 0.5 to 4 parts of the blow molding agent; And A resin-extruded article, characterized in that the gloss surface is formed by removing the skin layer formed during extrusion. The resin extrusion molded product according to claim 1, wherein the gloss portion is formed by monolithic extrusion with another part of the resin. The resin extrusion molded product according to claim 1 or 2, wherein the gloss portion and other portions are made of a wood powder-containing resin material forming the gloss portion. The wood powder according to claim 1, 2 or 3, wherein the wood powder in the wood powder-containing resin forming the gloss is made into a powder obtained by pulverizing the cellulosic material, and the powder is placed on the outer surface of the powder. Resin extruded article, characterized in that the produced by adhering the surface particles having a small particle size and high hardness. In the method for producing a molded article formed by extrusion molding of a resin, Preparing a wood powder-containing resin material consisting of 20 to 40 parts of the wood powder having a particle size of 20 mesh or less in 100 parts of the thermoplastic resin and 0.5 to 4 parts of the blow molding agent, Extruding the gloss portion forming at least the gloss surface using a wood powder-containing resin material, and Resin extrusion molded article manufacturing method comprising the step of removing the skin layer formed during the extrusion step.