KR20140100718A

KR20140100718A - Wood plastic composite and manufacturing method thereof

Info

Publication number: KR20140100718A
Application number: KR1020130013794A
Authority: KR
Inventors: 남경구
Original assignee: (주)엘지하우시스
Priority date: 2013-02-07
Filing date: 2013-02-07
Publication date: 2014-08-18

Abstract

The present invention relates to a synthetic wood having a surface printed layer capable of improving the appearance and physical properties by transferring a print layer to a surface thereof and then curing the composition through a UV curing process, and a method for producing the synthetic wood.
In order to accomplish this, the present invention provides a method for producing wood powder, comprising: milling wood or wood chips to produce wood powder; Adding a polymer resin to the wood powder and kneading the mixture at a high temperature to prepare a mixture; Extruding the mixture to produce a synthetic wood; Forming a surface printing layer on an upper surface of the synthetic wood; And UV curing the synthetic wood having the surface print layer.
According to the present invention, a printed layer is transferred onto a surface, and a synthetic wood is produced through UV curing to thereby express a fine appearance, improve physical properties, and use such a synthetic wood as an interior material There are advantages.

Description

Technical Field [0001] The present invention relates to a synthetic wood having a surface printing layer,

The present invention relates to a synthetic wood, and more particularly, to a synthetic wood having a surface print layer capable of improving appearance and physical properties through UV curing after transferring a print layer to a surface, and a method for producing the synthetic wood.

In general, Wood Plastic Composite is made by mixing wood and plastic to form a mixture so as to have appearance or properties similar to those of natural wood, followed by injection or extrusion to form a product similar to wood.

These synthetic timbers are a substitute for natural timber and tend to be used at a high rate every year. The synthetic wood is produced by mixing a variety of additives based on a method of mixing wood and plastic as described above, or by changing the manufacturing method thereof.

The plastic used in the conventional synthetic wood manufacturing method uses high density or low density polyethylene (PE), polypropylene (PP), vinyl chloride (PVC) or the like, and wood flour is usually used for recycled wood products, .

In addition, various kinds of additives to be added in the production of synthetic wood are added in various kinds and amounts depending on materials for forming synthetic wood, production method, end use of product, and the like.

For example, a blending agent is added for the purpose of connecting and dispersing the mixture of wood and plastic, a blocking agent is added so as not to interfere with the binding of the mixture, a sunscreen agent and a cushioning material to prevent the performance degradation of the product, A foaming agent and the like may be added.

However, in order to realize the appearance of the above-described conventional synthetic wood, various surface treatment methods such as embossing, sanding, and brushing are applied. However, such a surface treatment method has limitations in realizing a detailed appearance, .

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and provides a synthetic wood having a surface printing layer capable of improving appearance and physical properties through UV curing after transferring a printing layer on a surface thereof, There is a purpose.

According to another aspect of the present invention, there is provided a method of manufacturing a synthetic wood having a surface printing layer, comprising the steps of: milling wood or wood chips to produce wood powder; Adding a polymer resin to the wood powder and kneading the mixture at a high temperature to prepare a mixture; Extruding the mixture to produce a synthetic wood; Forming a surface printing layer on an upper surface of the synthetic wood; And UV curing the synthetic wood having the surface print layer.

In this case, the mixture comprises 10 to 90 parts by weight of the wood powder and 10 to 50 parts by weight of the polymer resin.

The polymer resin may include one or more of PP, PE, PVC, ABS, PS, PC, and PMMA.

The mixture may optionally contain one or more additives selected from the group consisting of 0.1 to 50 parts by weight of a compatibilizer, 0.1 to 50 parts by weight of a filler, 0.1 to 30 parts by weight of an antioxidant, 0.1 to 30 parts by weight of a lubricant and 0.1 to 30 parts by weight of a pigment, .

Further, the surface print layer is formed by a transfer printing method.

The synthetic wood having the surface print layer according to the present invention is characterized in that it is produced according to any one of the above-mentioned production methods.

The present invention according to the above-described constitution makes it possible to express a fine appearance by producing a synthetic wood through UV curing after transferring a print layer to the surface, and it is possible to improve physical properties, There are advantages to use.

FIG. 1 is a flow chart showing a process for manufacturing a synthetic wood material having a surface printing layer according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, a method of manufacturing a synthetic wood material having a surface printing layer according to a preferred embodiment of the present invention includes the steps of producing wood powder by crushing a raw wood or wood chip as a raw material, And then mixing the mixture at a high temperature to produce a mixture; preparing synthetic wood by extrusion molding the mixture; forming a surface print layer on the upper surface of the synthetic wood; And UV-curing the synthetic wood.

The process for producing the synthetic wood according to the present invention will be described in detail as follows.

First, the wood flour is preferably pulverized to a size of 50 to 120 mesh. That is, when the size of the wood flour is 50 mesh or less, the size of the wood flour itself becomes too large, and the dimensional stability and the elastic modulus of the plate itself deteriorate. On the contrary, when the size of the wood powder is 120 mesh or more, the wood is pulverized too finely, and thus, a phenomenon such as lump of wood powder occurs frequently during the compounding process of compounding it, and it becomes difficult to blend with the biodegradable resin.

It is also preferable that the wood powder is subjected to a drying process in which the wood powder is put into a drier so as to have a moisture content of 5 to 15% by weight after the pulverization and heated to 80 to 120 ° C. If the drying temperature of the wood powder is below 80 ° C, it takes a long time to dry. When the drying temperature is above 120 ° C, the dense structure of the wood powder itself is distorted due to rapid drying.

When the moisture content of the wood powder is maintained at 5 to 15% by weight, the wood particles are dried so as to have a water content of 5 to 15% by weight. When the moisture content is maintained at 5 to 15% by weight, smooth mixing with other raw materials is performed without adding a binder . When the moisture content is more than 15% by weight, bubbles are generated due to evaporation of moisture in the wood powder during the production of the wood plastic composite material, which weakens the binding force when blended with the polymer resin to be described later.

The wood powder thus prepared is mixed with the biodegradable resin and other additives to form a mixture. Preferably, the mixture may comprise 10 to 90 parts by weight of wood powder, 10 to 50 parts by weight of a polymer resin, and an additive.

In this case, the polymer resin may optionally include one or more of PP, PE, PVC, ABS, PS, PC, and PMMA.

The additive may optionally contain one or more of 0.1 to 50 parts by weight of a compatibilizer, 0.1 to 50 parts by weight of a filler, 0.1 to 30 parts by weight of an antioxidant, 0.1 to 30 parts by weight of a lubricant, and 0.1 to 30 parts by weight of a pigment Lt; / RTI > The mixture prepared at such a composition ratio is made of synthetic wood through an extrusion molding process.

A surface print layer is formed on the surface of the synthetic wood produced as described above. This surface printing layer can be formed in various ways.

In one embodiment, when a synthetic wood material extruded in a state in which a predetermined ink is put on a silicon roller having a predetermined pattern on its surface is conveyed in a horizontal direction by a conveyor, a pattern is formed on the surface of the synthetic wood by a silicone roller The shape can be transferred in such a manner that it is transferred.

In another embodiment, the surface printing layer may be formed by embossing embossed engraving through at least one surface by passing synthetic wood between the rotating embossing rollers, And then curing (gelling) it.

Specifically, the embossing roller may be formed as a pair of upper and lower embossing rollers. The embossing rollers maintain a predetermined gap so as to form an emboss on the surface at a constant pressing force without damaging the upper surface of the synthetic wood to be fed.

The outer periphery of at least one of the pair of embossing rollers is provided with a protrusion for pressing the upper surface of the synthetic wood to form an emboss having a predetermined pattern. Preferably, the protrusion may be formed on a roller provided on the upper side.

The embossing roller having such a structure receives the power of a motor (not shown) and rotates at a constant speed, and repeatedly forms an emboss having a neck or various patterns along the lengthwise direction of the synthetic wood which is fed to one side.

If the emboss is formed through the above process, the emboss may be formed by filling the ink of UV inks or liquid PVC of various colors in the embossment and then curing (gelling) the emboss. The inks to be filled in this way are highlighted so that patterns such as a neck pattern or various patterns are conspicuous.

To describe more specifically the process of filling the ink, the ink is first applied to the upper surface of synthetic wood which is conveyed in one direction, and then the ink applied is filled only in the emboss, The top surface of the synthetic wood can be scraped through a doctor blade to be removed.

In another embodiment, the surface print layer may be formed through an imprinting process that forms a stereoscopic design such as various patterns or patterns on the upper surface of the synthetic wood to be extruded. The imprinting method is a method of transferring the design engraved on the transfer film to the surface of the synthetic wood by attaching the transfer film to the upper surface of the synthetic wood and pressurizing it.

More specifically, when synthetic wood is extruded, UV resin is applied to the surface to form a surface layer. Preferably, the surface layer may be formed by extrusion molding and then painting UV resin onto the upper surface of the synthetic wood conveyed to one side by the belt conveyor.

After a surface layer of a predetermined thickness is formed, a transfer film having various depressions or embossed patterns of a negative angle or embossed is formed on one surface of the surface layer, which is in contact with the upper surface of the surface layer, is passed through an annular pressure roller . By such a pressing process, the design engraved on the transfer film is transferred to the surface of the surface layer.

After the design is transferred to the surface layer through such a process, the surface layer is cured by UV curing. Then, finally, the transfer film is removed to complete the surface printing layer according to the present invention.

On the other hand, a UV coating layer may be further formed on the surface printing layer formed through the above process so as to protect the surface. Such a UV coating layer is not particularly limited and can be formed through a commonly used process.

The synthetic wood according to the present invention having the above-described constitution can realize a detailed appearance by forming a surface printing layer on the surface through a transfer printing method. Also, by forming a UV coating layer by UV curing after forming the surface printing layer, the physical properties of the synthetic wood can be improved, and the appearance and physical properties of the surface are improved, so that the synthetic wood can be used as an interior material.

Claims

Pulverizing raw wood or wood chips as raw materials to produce wood flour;
Adding a polymer resin to the wood powder and kneading the mixture at a high temperature to prepare a mixture;
Extruding the mixture to produce a synthetic wood;
Forming a surface printing layer on an upper surface of the synthetic wood; And
And forming a UV coating layer on the surface of the synthetic wood having the surface print layer.

The method according to claim 1,
The mixture may contain,
10 to 90 parts by weight of the wood powder, and 10 to 50 parts by weight of the polymer resin.

3. The method of claim 2,
The above-
Wherein the surface printing layer comprises one or more of PP, PE, PVC, ABS, PS, PC, and PMMA.

3. The method of claim 2,
The mixture may contain,
0.1 to 50 parts by weight of a compatibilizing agent, 0.1 to 50 parts by weight of a filler, 0.1 to 30 parts by weight of an antioxidant, 0.1 to 30 parts by weight of a lubricant and 0.1 to 30 parts by weight of a pigment. And a surface printing layer formed on the surface of the substrate.

The method according to claim 1,
Wherein the surface print layer comprises:
Wherein the surface printing layer is formed by a transfer printing method.

A synthetic wood comprising a surface printing layer produced by the method of any one of claims 1 to 5.