Description

METHOD OF MANUFACTURING WOOD PANELS, METHOD

OF MANUFACTURING HIGH-GLOSSY SYNTHETIC RESIN

FILM SHEETS EMPLOYED FOR WOOD PANELS, AND WOOD

PANELS RESPECTIVELY MANUFACTURED USING THE

SAME Technical Field

[1] The present invention relates to methods of manufacturing a wood panel used as flooring/board materials, a wood panel using a high glossy synthetic resin film sheet, and a wood panel using a wood particle polypropylene fiber composite, and wood panels respectively manufactured by the methods. Background Art

[2] In general, the use of indoor wood flooring has increased, to cover the surface of a concrete structure of an indoor floor in a building, to make a room more decorative and pleasant, to produce a high quality indoor atmosphere giving quiet and wellbeing, and to give the feeling of a natural and beautiful wood material. Wood materials have been also widely used for parts of furniture including tables, musical instruments and the like. Accordingly, the use of wood panels for the flooring, furniture or musical instruments has been increasing.

[3] As the plywood manufacturing technology has been developed, a great quantity of plywood having its excellent properties has been provided, to increase the use of wood materials. Plywood is made from thin layers of a log by spinning and peeling off the log, not by directly cutting a square bar or a board from the log, during its process. The thin layers being cut to desired dimensions are stacked together, each with its grain at right angles to adjacent layers, and glued together using adhesives, thereby forming a plywood panel having a predetermined thickness.

[4] Since plywood has no grain in a regular direction while a solid wood material has the grain, plywood little warps and its resistance is improved in all aspects. However, in the plywood manufactured by the aforementioned method, ornamental effects decrease because the plywood does not have the natural grain and figure of wood, due to the processing characteristics of the plywood.

[5] Consequently, when the plywood panels are used for the flooring, constructional materials, indoor materials and the like, each of their surfaces is faced with a thin decorative layer and then coated with a resin paint to increase resistance to water, scratch and the like.

[6] For example, to increase its durability, a wood panel is pressed after a low pressure melamine (LPM) impregnated paper or high pressure melamine (HPM) sheet is placed on the panel.

[7] Generally, when a wood panel is manufactured using the LPM synthetic resin sheet, paper is primarily impregnated with a urea resin and dried, the impregnated paper is coated with a melamine resin and again dried, and then, the dried melamine impregnated paper is cooled and cut. When a wood panel is manufactured using the HPM synthetic resin sheet, paper or a fiber material, in which a printed natural or artificial image is included in any one side thereof, is impregnated with a melamine resin and a phenol resin, which are thermo setting resins, and then, the impregnated paper or fiber material is stacked to be hot-pressed at 50 kgf/D or more, using a multi daylight press, and to be formed.

[8] However, in the wood panel manufactured using the aforementioned conventional art, when the surface of the wood panel is treated with UV coating, a painting process needs to be performed through primary painting, intermediate painting and final painting. Moreover, during the painting process, bonding failure and bonding inability occur, which have been the problems to be solved in the relevant industries.

[9] To solve the problems and to increase the durability of the wood panel, there has been developed a method of manufacturing an LPM synthetic resin to be glued onto the surface of the wood panel. According to the conventional method, formalin (61.6 wt%), melamine (33.3 wt%) and distilled water (3.8 wt%) are mixed together in a reactor at room temperature, and then, triethylamine (TEA) (1.3 wt%) as a reaction catalyst is added to a mixture thereof. The pH level of the mixture is controlled to be 8.3 to 8.5. The mixture is heated until its temperature is 95°C. When the temperature reaches 95 ⁰ C, a reaction is kept to progress. After 3 to 4 hours, distilled water of 25 ⁰ C and the LPM synthetic resin are mixed at a rate of 4: 1. When a mixture thereof takes a white appearance, the mixture is cooled down at the room temperature. During the cooling, when the temperature of the mixture is 70 ⁰ C, urea (12 wt%) and TEA (2.5 wt%) are added. Then, diethylene glycol (DEG) (2.4 wt%) and methanol (3.0 wt%) are added and sodium hydroxide is added to control the pH level so as to be 9.0 to 9.2, thereby completing the LPM synthetic resin. After the LPM synthetic resin manufactured by the aforementioned method is mixed with a hardening agent of 0.3 to 0.5 wt%, a release agent of 0.4 to 0.8 wt% and a dispersing agent of 0.5 to 1.0 wt%, paper is impregnated with the LPM synthetic resin.

[10] When a wood panel used as a board material is manufactured using the paper impregnated with the LPM resin, the binding force between the LPM synthetic resin sheet and the wood panel is good due to the characteristics of the LPM synthetic resin. However, since it is difficult to additionally paint the top surface of the LPM synthetic

resin sheet, it is impossible to perform the UV coating process on the top surface thereof. Thus, the coating/painting process needs to be sequentially carried out through primary painting, intermediate painting and final painting, to be glued together, on most of the surface layers or the decorative layers of wood panels when they are manufactured using the LPM synthetic resin sheets. Consequently, this method needs the complicated processes.

[11] Moreover, in processing the surface of the LPM paper (sheet), the surface of the

LPM synthetic resin sheet is not painted with a wood paint. Since 100% painting is not performed, a failure rate is high.

[12] In addition, a conventional out-lay/in-lay painting process is performed for gluing a wood layer or a decorative layer onto the surface of a plywood panel. The decorative layer is designed using varieties by a method of mosaic construction while maximizing the feeling of a natural material. However, the method of mosaic construction has limitations in expressing diverse colors and has a high loss rate, to increase the cost. Moreover, it is difficult to supply the same materials and it is necessary to purchase expensive equipment (laser equipment). In parts of the plywood panels, a decorative layer is replaced with the conventional LPM synthetic resin sheet. However, when the plywood panel using the LPM synthetic resin sheet is produced by the out-lay/in-lay process, failure is caused by the adhesion within the sheet, and the surface painting after forming the sheet is unstable.

[13] Wood panels as board materials are manufactured by using a synthetic resin sheet using an HPM resin as well as the synthetic resin sheet using the LPM resin. In this case, an additional process of treating adhesives is needed due to the characteristics of the HPM synthetic resin. Further, a surface painting process is carried out through primary painting, intermediate painting and final painting. Thus, in the method of manufacturing the wood panel using the HPM synthetic resin, the manufacturing process is complicated and it is difficult to overcome the instability of the surface painting.

[14] Consequently, it is very difficult to obtain the sheet having the high glossy surface and the high resistance to scratch, using the aforementioned methods. In the relevant industries, much research and approach have been conducted to solve the problems of the aforementioned methods but it has been a process of trial and error.

[15] In the other hand, there are the other methods used to provide the surface of furniture with high glossy and gorgeous and beautiful appearance. One of the methods directly bonds paper including a gloss material, such as powdered pearl, or a metallic, hologram or polyester film and the like, to a wood panel used as a board material for furniture, using adhesives, and thereafter performs the final painting on the paper by using a polyester resin. Another method directly mixes the powdered gloss material with a polyester paint and thereafter sprays a mixture thereof on the surface of the

wood panel.

[16] However, in these methods, a resin layer easily separates from the surface of the wood panel due to the particles of the gloss material, or the surface of the wood panel is damaged by a slight scratch. In the method of spraying the mixture of the powdered gloss material and the polyester paint on the surface of the wood panel, since the effect of the gloss material is weakened by the color paint, a great quantity of the gloss material is needed, to increase the cost. Moreover, when a great quantity of the gloss material is used, the paint color fades and a coating layer needs to be formed as a post- process, to make the whole process complicated.

[17] That is, when the LPM/HPM synthetic resin sheet is used in each method for applying high gloss to the surface layer of the wood panel used as a board material, there is the problem in that the sheet separates from the surface of the wood panel, and when the powdered gloss material is directly used on the surface of the wood panel, there is the problem in that the color fades and the process becomes complicated. Therefore, there are many difficulties in manufacturing a synthetic resin sheet having high gloss (called Hi-gloss) while using the LPM/HPM synthetic resin sheet, and in manufacturing wood panels using the synthetic resin sheet.

[18] To solve the aforementioned problems, the inventor of the present invention has presented the method for manufacturing multi-functional synthetic resin sheet, and multi-functional synthetic sheet manufactured using the same in Korean Patent Application No. 2005-128954. However, it is still difficult to expect the satisfactory effect of high gloss.

[19] In addition, as another example of the method of manufacturing a wood panel, when flooring is manufactured by pressing the LPM impregnated paper on medium- density fiberboard (MDF) to be bonded together, at high temperature and high pressure, the manufacturing cost is reduced but the resistance to water and heat is week.

[20] Specifically, plywood or MDF used as a basic material is processed when it is dried. However, when plywood or MDF is actually used to be installed on an indoor floor of a building, since the indoor temperature and humidity change depending on changes in the seasons, such as summer and winter and the like, its connection parts get loose or separate from each other due to the internal stress as it shrinks and/or expands accordingly. Moreover, its initially glued condition cannot be maintained due to its chemical deterioration. Consequently, its dimensional stability and resistance to water become weak.

[21] However, in the case of manufacturing strengthened flooring using a high-density fiberboard (HDF), click process and floating installation can be applied and surface strength is strengthened. However, since the strengthened flooring cannot use a natural

decorative layer, the feel of a natural material decreases. Moreover, the strengthened floor has weak resistance to water and is heavy.

[22] Among the technologies presented to solve the aforementioned problems, the technology of manufacturing Ondol flooring (Ondol means Korean under-floor heating system) using wood fibers (wood particles) polypropylene fiber composite material is disclosed in Korean Utility Model Registration No. 399316.

[23] In the prior art using the wood fiber/particle polypropylene fiber composite panel as the basic material of the Ondol flooring, there is provided the flooring which makes up for the resistance to water, i.e., the biggest drawback of the strengthened flooring, makes up for the resistance to impact, i.e., the drawback of the plywood flooring, and produces the feeling of a natural material. However, in this prior art, the resistance to scratch is weak due to the characteristics of its surface sheet and it is considerably difficult to obtain the flooring having the high glossy surface.

[24] In addition, when wood panels are used as plywood flooring and the like, after a decorative layer is glued onto the plywood panel and coloring and coating of the decorative layer is performed using a roll coater, a synthetic resin is forcibly injected into the decorative layer, using a decompressing device, to strengthen the surface hardness. However, since the coloring is performed by a coloring process using the roll coater, the advantage (pattern) of the wood material, which is the merit of the decorative layer, is not maintained as it is. Moreover, although paints, such as urethane, epoxy and acryl based paints, are thickly applied to increase the surface hardness, the resistance to screech and wear, and the durability, since these paints make the strength too strong, the flexibility relatively decreases, so that the wood panel surface is likely to be cracked.

[25] On the other hand, examples of several techniques developed to strengthen the surface strength include a technique of using a wood polymer composite (WPC). As one method of the technique, a single wood sheet (decorative layer) is impregnated with a resin, to increase its strength and hardness, and thereafter, the sheet is finished by a painting process through primary painting, intermediate painting and final painting. As another method, when the single wood sheet (decorative layer) is not glued onto the plywood, the resin is pressurized to be forcibly injected and hardened within vacant spaces and cell layers of the wood. However, in this case, as the wood shrinks and/or expands by moisture, the wood sheet is likely to crack along the direction of the grain.

[26] As another method, in the plywood manufactured using the sheet impregnated with a melamine resin and overlay-pressed, when a decorative layer is bonded to the plywood, the top of the decorative layer impregnated with the melamine resin is covered with the overlay containing aluminum oxide (Al O ), and the overlay is

pressed to be permeated into the decorative layer, at high temperature and high pressure. This method is similar to the method of manufacturing the strengthened flooring. However, this method also decreases the economical efficiency because it needs the expensive equipment and the complicated processes. Moreover, it is still difficult to obtain the surface having the feeling which can be produced by a thin coating method performed on the decorative layer as a consumer desires.

[27] Moreover, its manufacturing process is relatively complicated, to increase the production cost. Disclosure of Invention Technical Problem

[28] Therefore, the present invention has been made to solve the above problems raised in manufacturing each of the aforementioned wood panels, and it is an object of the present invention to provide a method of manufacturing a wood panel using a wood particle polypropylene fiber composite panel and a product manufactured by the method, thereby providing the surface of the wood panel with high gloss, providing high resistance to impact, water and heat, and creating an effect of the feeling of a natural material.

[29] It is another object of the present invention to provide a method of manufacturing a wood panel by directly hot-pressing impregnation graft paper onto the surface of the wood panel and coating the surface thereof, thereby providing a high quality product, simplifying a production process, and maximizing the reduction of production cost.

[30] It is another object of the present invention to provide a method of manufacturing a high glossy synthetic resin sheet using an LPM/HPM synthetic resin sheet for high gloss for a wood panel and a product manufactured by the method and a wood panel using the product, thereby preventing the synthetic resin sheet, such as the LPM/HPM synthetic resin sheet for high gloss, from separating from the wood panel, providing a surface layer of the synthetic resin sheet with improved durability and resistance to water, improving an binding force between the synthetic resin sheet and the wood panel, providing an effect of high gloss, improving productivity, reducing production cost and improving reliability of the product quality. For this purse, the high glossy synthetic resin sheet enables ultra violet (UV) high glossy coating performed by applying UV coating to a conventional LPM/HPM synthetic resin sheet, without a complicated painting process including primary painting, intermediate painting and final painting. Technical Solution

[31] In accordance with an aspect of the present invention, the above and other objects can be accomplished by a method of manufacturing a wood panel which is used as a

board material, flooring using a wood particle polypropylene fiber composite panel or obtained by directly hot-pressing an impregnation paper on a plywood panel and by treating environment friendly UV coating thereto, and a product manufactured by the method.

[32] In accordance with another aspect of the present invention, it provides a method of manufacturing a high glossy synthetic resin sheet for a wood panel, a product manufactured by the method, and a wood panel using the high glossy synthetic resin sheet produced by applying UV high glossy coating to a conventional LPM/HPM synthetic resin sheet.

[33] In accordance with another aspect of the present invention, it provides a method of manufacturing flooring, and a product manufactured by the method, the flooring using a wood particle polypropylene fiber composite panel or produced by directly hot- pressing impregnation graft paper onto a plywood panel and by applying environment friendly UV coating thereto, to improve hardness, resistance to scratch and properties, to reduce a deformation rate due to the strengthening of a binding force between layers, and to improve internal moisture content and durability with respect to the flooring. Advantageous Effects

[34] In accordance with the present invention, the high glossy synthetic resin sheet is hot-pressed to be bonded with the surface of a wood panel, such as plywood and the like used as a diverse furniture material, a flooring panel and others. The high glossy synthetic resin sheet is produced by sequential impregnation processes, without a very complicated painting process performed to provide an expected effect of high gloss on a surface layer of a panel in the conventional art. Therefore, the relevant work process is considerably shortened, the yield increases, the cost is reduced and the reliability of the product quality is improved.

[35] Furthermore, in accordance with the present invention, the wood panel manufactured using the LPM/HPM for high gloss and the like provides the effect of high gloss, excellent bonded condition and improved resistance to scratch on the surface of the wood panel. Accordingly, the wood panel which is used as flooring to be installed on an indoor floor also has the high glossy surface and the increased resistance to impact, water and heat and creates a high quality indoor atmosphere, based on the effect of the feeling of a natural material.

[36] Furthermore, in accordance with the present invention, the wood panel, which is used as flooring plywood applying a painting LPM synthetic resin sheet and the like, is manufactured through a relative simple process. When the wood panel manufactured through the process is applied as the flooring plywood and the like, there are provided

the effects of increasing hardness, resistance to scratch, and properties, decreasing a deformation rate , and improving internal moisture content and durability with respect to the flooring. Furthermore, as the process is shortened, the production cost is significantly reduced. Brief Description of the Drawings

[37] These and other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[38] FIG. 1 is a flow chart of a method of manufacturing a wood panel according to a first embodiment of the present invention;

[39] FIG. 2 is a schematic view of a process of manufacturing a wood particle polypropylene fiber composite panel (WPPFCP) sheet;

[40] FIG. 3 is a schematic view of a process of manufacturing a glass fiber sheet applicable on the WPPFCP sheet of FIG. 2;

[41] FIG. 4 is a schematic view of a process of pressing a painting LPM synthetic resin sheet on the WPPFCP sheet manufactured by the process of FIG. 2;

[42] FIG. 5 is a schematic view of a process of cold-pressing a half-finished product obtained by the process of FIG. 4, which is stacked on flooring plywood;

[43] FIG. 6 is a flow chart of a method of manufacturing a wood panel according to a second embodiment of the present invention;

[44] FIG. 7 is an enlarged sectional view of the flooring finally produced by the method of FIG. 6;

[45] FIG. 8 is a schematic view of a process of manufacturing a glass fiber sheet, corresponding to a first process applied in the method of FIG. 6;

[46] FIG. 9 is a schematic view of a process of manufacturing a painting LPM synthetic resin sheet, corresponding to a second process applied in the method of FIG. 6;

[47] FIG. 10 is a flow chart of a method of manufacturing a wood panel according to a third embodiment of the present invention;

[48] FIG. 11 is a flow chart of a process of manufacturing a synthetic resin sheet in the method of FIG. 10;

[49] FIG. 12 is a schematic view of the process of manufacturing the synthetic resin sheet of FIG. 11; and

[50] FIG. 13 is a schematic view of a UV coating and hardening process in the method of FIG. 10. Best Mode for Carrying Out the Invention

[51] The present invention to solve the aforementioned technical problems will be described with reference to three embodiments as follows:

[52] In accordance with a first embodiment of the present invention, there are provided a wood panel using a wood particle polypropylene fiber composite panel (WPPFCP) and a method of manufacturing the same, the method comprising:

[53] performing a manufacturing process Sl-10 of manufacturing a WPPFCP sheet

1-10;

[54] performing a pressing process S 1-20 of pressing the WPPFCP sheet 1-10 by gluing impregnation graft paper 1-22 to the bottom surface of a painting LPM synthetic resin sheet 1-20 and positioning the WPPFCP sheet 1-10 under the impregnation graft paper 1 99-

[55] performing a laminating process S 1-30 of laminating a half- finished product obtained by the pressing process S 1-20 after coating a top surface of a wood panel 1-30 with an EVA-based adhesive, and cold-pressing and curing the laminated half- finished product; and

[56] performing a coating and cutting process S 1-40 of coating and cutting a product obtained through the laminating process Sl-30, thereby producing an end product.

[57] In accordance with a second embodiment of the present invention, there are provided a wood panel and a method of manufacturing the same, the method comprising:

[58] performing a glass fiber paper manufacturing process S2-10, which is performed by impregnating glass fiber paper, composed of 60 to 80 g/D glass fibers of 70 wt%, paper pulp of 15 wt%, and a binder of 15 wt%, with a phenol resin so that an impregnation rate compared to the mass of the fiber glass paper is 180 to 250 %, by drying the impregnated glass fiber paper in a drier maintaining the temperature of 120 ⁰ C, for 60 to 90 seconds, and then by cutting the dried glass fiber paper;

[59] performing a painting LPM synthetic resin sheet manufacturing process S2-20, which is performed by composing a mixture for first impregnation and firstly impregnating paper, using a 60 mesh roll, in a first impregnation tank containing the mixture composed of a dispersing agent of 20 wt% and a release agent of 5 wt%, compared to a phenol and melamine cocondensation resin of 100 wt%, by composing a mixture for second impregnation and secondly impregnating the firstly impregnated paper, using a 60 mesh roll, in a second impregnation tank containing the mixture composed of subacid silver nano particles of 5 wt% having a density of 1000 ppm and an average particle of 5 to 20 nm (nanometers), methyl ethyl ketone (MEK) of 5 wt%, titanium oxide (TiO) of 70 wt% and a hardening agent of 0.8 wt%, compared to the phenol and melamine cocondensation resin of 100 wt%, by composing a mixture for third impregnation and thirdly impregnating the secondly impregnated paper, using a 40 mesh roll, in a third impregnation tank containing the mixture composed of a crack preventing additive of 5 wt%, a hardening agent of 0.8 wt% and a release agent of 0.7

wt%, compared to a melamine resin of 100 wt%, and by composing a mixture for fourth impregnation and fourthly impregnating the thirdly impregnated paper, using a 40 mesh roll applied with the resin, in a fourth impregnation tank containing the mixture composed of a crack preventing additive of 5 wt%, a hardening agent of 1.0 wt% and a release agent of 5 wt%, compared to the melamine resin of 100 wt%, wherein, during the paper is subjected to each of the first to fourth composition and impregnation, it is dried through each dry line maintaining the temperature of 13O ⁰ C and having a transfer speed of 40 m/min;

[60] performing a pressing process S2-30, which is performed by safely placing the glass fiber paper obtained by the glass fiber paper manufacturing process S2-10 on plywood being 6 to 8 mm, by safely placing the painting LPM synthetic resin sheet obtained by the painting LPM synthetic resin sheet manufacturing process S2-20 on the glass fiber paper, and by pressing the sheets within the range of 0 to 14O ⁰ C, for 40 to 65 seconds, at the pressure of 16 to 20 kgf/D, using a hot and cold multi daylight press; and

[61] performing a coating and cutting process S2-40, which is performed by coating, at primary painting and intermediate painting, a top surface of a half- finished product obtained by the pressing process S2-30, by coating, at final coating, the top surface through a T&G process, and by cutting the product, thereby producing an end product.

[62] In accordance with a third embodiment of the present invention, there are provided a wood panel using a high glossy synthetic resin sheet and a method of manufacturing the same, the method comprising:

[63] performing a synthetic resin sheet manufacturing process S3-10 of manufacturing a synthetic resin sheet;

[64] performing a hot-pressing process S3-20 for hot-pressing the synthetic resin sheet obtained by the synthetic resin sheet manufacturing process S3- 10 so as to be bonded to a wood panel; and

[65] performing a UV coating and hardening process S3-30 of performing UV coating on a surface layer of the synthetic resin sheet bonded with a surface layer of the wood panel through the hot-pressing process S3-20 and hardening the UV coated surface layer. Mode for the Invention

[66] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[67] (First Embodiment)

[68] In the first embodiment of the present invention a method of manufacturing a wood panel using a wood particle polypropylene fiber composite panel (WPPFCP) comprises the sequence of processes which will be described below:

[69] 1st process: WPPFCP sheet manufacturing process Sl-IO

[70] This process is to manufacture a wood panel using the WPPFCP.

[71] A selected WPPFCP sheet 1-10 is composed of a polypropylene resin : wood particles : calcium carbonate (CaCO ) : tourmaline having a rate of 4 : 3 : 2.5 : 0.5 wt%. Then, the WPPFCP sheet 1-10 is pressed on a T-DIE (not shown) to have a thickness of 0.8 to 2.0 mm, to form a WPPFCP sheet 1-11. A nonwoven fabric 1-12 wound on each roller and the like is guided onto each of a top surface and a bottom surface of the WPPFCP 1-11 and is bonded to each surface thereof by heat fusion, to obtain the WPPFCP sheet 1-10.

[72] Unlike the above, a glass fiber sheet 1-13, instead of the nonwoven fabric 1-12, may be guided onto the top surface of the WPPFCP 1-11 by the same manner, so that the glass fiber sheet 1-12 is bonded to the top surface thereof by heat fusion, to obtain the WPPFCP sheet 1-10.

[73] The glass fiber sheet 1-13 means a fabric type which is woven using long fibers of glass, like general fibers. The glass fiber sheet 1-13 is obtained by impregnating a glass fiber paper l-13a with a phenol resin and drying the impregnated glass fiber paper in an oven and the like.

[74] That is, the glass fiber paper l-13a as used is composed of 30 to 80 g/D glass fibers of 70 wt%, paper pulp of 15 wt%, and a binder of 15 wt%. The glass fiber paper l-13a is impregnated with a phenol resin by 180 to 250% compared to weighing. The impregnated glass fiber paper 1- 13a is dried in a dryer, such as an oven and the like, which maintains the temperature of 12O ⁰ C, for about 1 minute to 1 minute and 30 seconds, so that a completed glass fiber sheet 1-13 is obtained.

[75] When the WPPFCP 1- 10 is obtained by placing the glass fiber sheet 1- 13 on the top surface of the WPPFCP 1-11 so as to be bonded together by heat fusion, painting LPM 1-21 safely placed on the top surface of the WPPFCP sheet 1-10 and a painting LPM synthetic resin sheet 1-20 being impregnation graft paper 1-22 are efficiently bonded to the WPPFCP sheet 1-10 during a pressing process, which will be describe later.

[76] Therefore, as illustrated in FIG. 2, the WPPFCP sheet 1- 10 in this process is obtained by bonding the nonwoven fabric 1-12 to each of the top and bottom surfaces of the WPPFCP sheet 1-11 or by bonding the glass fiber sheet 1-13 to the top surface of the WPPFCP sheet 1-11 and bonding the nonwoven fabric 1-12 to the bottom surface of the WPPFCP sheet 1-11.

[77] 2nd process: Pressing process S 1-20

[78] This process is to press the WPPFCP sheet 1-10 obtained by the WPPFCP sheet manufacturing process Sl-10 and a painting LPM synthetic resin sheet 1-20 stacked on the WPPFCP sheet 1-10, using a multi daylight press on the condition of hot- pressing/cold-pressing.

[79] As illustrated in FIG. 4, the painting LPM synthetic resin sheet 1-20 used in this process is provided by bonding painting LPM 1-21 and impregnation graft paper 1-22 placed under the painting LPM 1-21.

[80] The painting LPM 1-21 is manufactured by:

[81] composing a mixture for first impregnation and firstly impregnating paper, using a

60 mesh roll, in a first impregnation tank containing the mixture composed of a dispersing agent of 20 wt% and a release agent of 5 wt%, compared to a phenol and melamine cocondensation resin of 100 wt%,

[82] composing a mixture for second impregnation and secondly impregnating the firstly impregnated paper, using a 60 mesh roll, in a second impregnation tank containing the mixture composed of subacid silver nano particles of 5 wt% having a density of 1000 ppm and an average particle of 5 to 20 nm (nanometers), methyl ethyl ketone (MEK) of 5 wt%, titanium oxide (TiO) of 70 wt% and a hardening agent of 0.8 wt%, compared to the phenol and melamine cocondensation resin of 100 wt%,

[83] composing a mixture for second impregnation and thirdly impregnating the secondly impregnated paper, using a 40 mesh roll, in a third impregnation tank containing the mixture composed of a crack preventing additive of 5 wt%, a hardening agent of 0.8 wt% and a release agent of 0.7 wt%, compared to a melamine resin of 100 wt%, and

[84] composing a mixture for second impregnation and fourthly impregnating the thirdly impregnated paper, using a 40 mesh roll applied with the resin, in a fourth impregnation tank containing the mixture composed of a crack preventing additive of 5 wt%, a hardening agent of 1.0 wt% and a release agent of 5 wt%, compared to the melamine resin of 100 wt%, and

[85] wherein, during the paper is subjected to each of the first to fourth composition and impregnation, it is dried through each dry line maintaining the temperature of 13O ⁰ C and having a transfer speed of 40 m/min after it is impregnated in each impregnation tank.

[86] The painting LPM 1-21 is bonded to the impregnation graft paper 1-22, so that the painting LPM synthetic resin sheet 1-20 needed in the present invention is obtained.

[87] When the painting LPM synthetic resin sheet 1-20 is stacked on the top surface of the WPPFCP sheet 1-10 obtained by the WPPFCP manufacturing process Sl-10, the painting LPM synthetic resin sheet 1-20 and the WPPFCP sheet 1-10 are hot-pressed at pressure of 12 to 15 kgf/D and within the temperature range of 130 to 14O ⁰ C, for about 15 to 20 minutes, and thereafter, these sheets are cold-pressed for about 20 to 30 minutes, so that a half- finished product A is obtained.

[88] 3rd process: Laminating process S 1-30

[89] This process is to laminate the half-finished product A obtained by the pressing

process S 1-20 on the wood panel 1-30 used for flooring plywood, using an adhesive, so that flooring is obtained by cold-pressing.

[90] This process is performed by passing the wood panel 1-30, applied as the flooring plywood having a thickness of 7.2 to 12 mm, through a spreader, forming a binding layer by applying an EVA-based adhesive to a top surface of the wood panel 1-30, laminating the half-finished product A obtained by the pressing process S 1-20 on the binding layer, and curing the half-finished product A laminated on the top surface of the wood panel 1-30 using the binding layer.

[91] The cold pressing process is performed at pressure of 20 to 25 kgf/D, for about 2 hours to 2 hours and a half, and thereafter, natural hardening is performed at room temperature for 24 hours, so that an end product is obtained.

[92] 4th process: process S 1-40

[93] This process is to coat the end product obtained by the laminating process S 1-30 and to cut the end product to be used in the field.

[94] This process is performed by coating a top surface of the product obtained by the laminating process S 1-30 at intermediate painting, performing a T&G process on the side and bottom surfaces of the product to process tongues and grooves so that the flooring plywood is connected together, and re-coating the top surface of the product at final painting, so that the product is packaged as the final product to be shipped.

[95] (Second Embodiment)

[96] The second embodiment of the present invention will be described, in detail, with reference to the accompanying drawings:

[97] 1st process: Glass fiber paper manufacturing process S2-10

[98] This process is to manufacture glass fiber paper 2-10 which is one of the elements of the invention according to the second embodiment. The glass fiber paper 2-10 means a fabric type which is woven using long fibers of glass, like general fibers.

[99] As illustrated in FIG. 8, the glass fiber paper 2-10 -13a is obtained by impregnating the glass fiber paper 2-10 composed of 60 to 80 g/D glass fibers of 70 wt%, paper pulp of 15 wt%, and a binder of 15 wt% with a phenol resin so that an impregnation rate compared to the mass of the fiber glass paper is 180 to 250 %, drying the impregnated glass fiber paper in a drier maintaining the temperature of 12O ⁰ C, for 60 to 90 seconds, and then cutting the dried glass fiber paper.

[100] As illustrated in FIG. 7, the glass fiber paper 2-10 is stacked on a top surface of a wood panel 2-1 to be used as flooring plywood and is bonded to the wood panel 2-1 by a pressing process S2-30, which will be described later.

[101] 2nd process: Painting LPM synthetic resin sheet manufacturing process S2-20

[102] After the glass fiber paper 2- 10 is stacked on the top surface of the wood panel 2- 1 to be sued as the flooring plywood as illustrated in FIG. 7, this process is to obtain a

painting LPM synthetic resin sheet 2-20 to be stacked on a top surface of the glass fiber paper 2-10.

[103] The completed painting LPM synthetic resin sheet 2-20 is obtained by the sequence of four- time impregnating processes using first to fourth impregnation tanks.

[104] Paper is firstly received within a first impregnation tank 2-100 containing a mixture composed of a dispersing agent of 20 wt% and a release agent of 5 wt%, based on the weight percent of the phenol and melamine cocondensation resin.

[105] The first impregnation tank 2-100 comprises a roll having a 60 mesh surface.

Original paper P passes in the mixed resin in the first impregnation tank 2-100 and moves while it is wound on the roll. The paper P is allowed to be sufficiently impregnated with the first mixed resin, to strengthen the binding force between the paper P and an ink layer.

[106] After the paper P is firstly impregnated in the first impregnation tank 2-100, it is transferred to a second impregnation tank 2-200 so as to be secondly impregnated. A resin contained in the second impregnation tank 2-200 is composed of subacid silver nano particles of 5 wt% having a density of 1000 ppm and an average particle of 5 to 20 nm (nanometers), methyl ethyl ketone (MEK) of 5 wt% corresponding to ketone which is technically important and used as lacquer and resin solvents and the like, titanium oxide (TiO) of 70 wt% meaning an optical catalyst, being widely applicable because it harmless to a human body and it is water-soluble, and being semipermanently usable by one-time application, and a hardening agent of 0.8 wt%, compared to the phenol and melamine cocondensation resin of 100 wt%. The firstly impregnated paper P is secondly impregnated by passing a roller having a 60 mesh roll included in the second impregnation tank 2-200.

[107] The secondly impregnated paper P is continuously transferred to be again impregnated in a third impregnation tank 2-300. The third impregnation tank 2-300 contains a mixed resin composed of a crack preventing additive of 5 wt%, a hardening agent of 0.8 wt% and a release agent of 0.7 wt%, compared to a melamine resin of 100 wt%. The secondly impregnated paper P is thirdly impregnated with the mixed resin of the third impregnation tank 2-300, through a roller having an about 40 mesh roll.

[108] The thirdly impregnated paper P is continuously transferred to be again impregnated in a fourth impregnation tank 2-400 for a final impregnating process. A surface layer of the final painting LPM synthetic resin sheet 2-20 obtained through the fourth impregnation tank 2-400 is given not only a functional group but also UV high gloss.

[109] To finally obtain the painting LPM synthetic resin sheet 2-20 having the UV high gloss, the thirdly impregnated paper P is further impregnated with a mixed resin contained in the fourth impregnation tank 2-400. The mixed resin is composed of a

crack preventing additive of 5 wt%, a hardening agent of 1.0 wt% and a release agent of 5 wt%, compared to a melamine resin of 100 wt%, and thereafter by adding one or more selected from urethane of 5 wt%, isocyanate of 5 wt% and an unsaturated polyester-based resin of 10 wt% being an acid and alcohol polymerization resin. The thirdly impregnated paper P is finaly impregnated with the mixed resin of the fourth impregnation tank 2-400.

[110] Urethane has excellent mechanical strength (such as tensile strength, tear strength, elongation percentage, resistance to wear and the like), good processing property, high elasticity, high mechanical strength, and excellent resistance to wear. Therefore, in the present invention, it is most stable to add urethane of 5 wt% to the mixture, compared to the melamine resin of 100 wt%.

[I l l] Isocyanate is added for a crosslink reaction with urethane. Isocyanate is mixed at a mixing rate of 5 wt%, compared to the weight percent of the melamine resin. The unsaturated polyester-based resin which is the acid and alcohol polymerization resin is mixed, using acrylic acid-based ester which is excellent in flexibility, weatherability, binding property, and adhesion inducing property in the functional group.

[112] The fourth impregnation tank 2-400 is provided with a 40 mesh roll applied with the resin. The paper P, which is dried after the third impregnating process, is guided to pass the roll applied with the resin, so that the paper P is impregnated with the mixed resin. Preferably, an additive for providing the strength of the surface layer to the surface of the roll applied with the resin may be sufficiently applied thereto.

[113] It is confirmed that the synthetic resin sheet subjected to each of the impregnating processes has an impregnation amount, i.e., an impregnation rate, of 220% and a moisture content of 7.5%. A dry line D is provided between two of the first to fourth impregnation tanks 2-100, 2-200, 2-300 and 2-400, to properly dry the impregnated paper P through each impregnating process. For this purpose, preferably, each dry line D may maintain a temperature of 130 ⁰ C as the same condition and may operate at a speed of 40 m/min.

[114] 3rd process: Pressing process S2-30

[115] This process is to cut the paper P through the painting LPM synthetic resin sheet manufacturing process S2-20 at predetermined dimensions, to stack the paper P on the wood panel 2-1 to be used as the flooring plywood and to press the paper P onto the wood panel 2-1. As illustrated in FIG. 7, when the glass fiber paper 2-10 obtained by the first process, i.e., the glass fiber paper manufacturing process S2-10, is stacked on the top surface of the wood panel 2- 1 and the painting LPM synthetic resin sheet 2-20 obtained by the second process, i.e., the painting LPM synthetic resin sheet manufacturing process S2-20, is stacked on the glass fiber paper 2-10, hot-pressing is performed at pressure of 16 to 20 kgf/D, within the temperature range of 0 to 14O ⁰ C, for

40 to 65 seconds, so that the painting LPM synthetic resin sheet 2-20, the glass fiber paper 2-10 and the wood panel 2-1 are bonded together, thereby producing the wood panel 2-1 to be used as the flooring plywood having the good binding force therebetween. [116] The thickness of the wood panel 2-1 to which the present invention applies is 6 to 8 mm. Since this thickness has the excellent efficiency in terms of the adhesion to a bottom surface of the painting LPM synthetic resin sheet 2-20, preferably, the thickness may be limited to 6 to 8 mm. [117] 4th process: Coating and cutting process S2-40

[118] This process is to coat the final surface of the wood panel 2-1 obtained through the third process, i.e., the pressing process S2-30, that is, the top surface of the painting

LPM synthetic resin sheet 2-20 to form a UV coating layer 2-30, and thereafter to cut the wood panel 2-1 at proper dimensions, so that the wood panel according to the second embodiment of the present invention is obtained. [119] (Third Embodiment)

[120] The third embodiment of the present invention will be described, in detail, with reference to FIGS. 10 through 13. [121] The third embodiment provides a wood panel using a high glossy synthetic resin sheet manufactured by a method comprising: [122] performing a synthetic resin sheet manufacturing process S3-10 of manufacturing a synthetic resin sheet; [123] performing a hot-pressing process S3-20 for bonding the synthetic resin sheet obtained by the synthetic resin sheet manufacturing process S3- 10 to a wood panel; and [124] performing a UV coating and hardening process S3-30 of performing UV coating on a surface layer of the synthetic resin sheet bonded to a surface layer of the wood panel through the hot-pressing process S3-20 and hardening the UV coated surface layer. [125] The method according to the third embodiment will be described with respect to each of the processes:

[126] 1st process: Synthetic resin sheet manufacturing process S3- 10

[127] This process of manufacturing the synthetic resin sheet may be variously carried out in various exemplary embodiments as follows:

[128] - First exemplary embodiment for manufacturing a synthetic resin sheet -

[129] In accordance with the first exemplary embodiment, there is provided a process of manufacturing a high glossy synthetic resin sheet to be bonded to a surface layer of a wood panel. The scope of this process is similar to that of the second embodiment of the present invention.

[130] The process of manufacturing a high glossy synthetic resin sheet comprises:

[131] a 1st composition and impregnation process S3-11 of impregnating paper in a first impregnation tank containing a mixture composed of a dispersing agent of 20 wt% and a release agent of 5 wt%, compared to a phenol and melamine cocondensation resin of 100 wt%, using a 60 mesh roll,

[132] a 2nd composition and impregnation process S3-12 of impregnating the paper, firstly impregnated through the 1st composition and impregnation process S3-11, in a second impregnation tank containing a mixture composed of subacid silver nano particles of 5 wt% having a density of 1000 ppm and an average particle of 5 to 20 nm (nanometers), methyl ethyl ketone (MEK) of 5 wt%, titanium oxide (TiO) of 70 wt%, and a hardening agent of 0.8 wt%, compared to the phenol and melamine cocondensation resin of 100 wt%, using a 60 mesh roll,

[133] a 3rd composition and impregnation process S3- 13 of impregnating the paper, secondly impregnated through the 2nd composition and impregnation process S3- 12, in a third impregnation tank containing a mixture composed of a crack preventing additive of 5 wt%, a hardening agent of 0.8 wt% and a release agent of 0.7 wt%, compared to a melamine resin of 100 wt%, using a 40 mesh roll,

[134] a 4th composition and impregnation process S3-12 of impregnating the paper, thirdly impregnated through the 3rd composition and impregnation process S3-13, in a fourth impregnation tank containing a mixture composed of a crack preventing additive of 5 wt%, a hardening agent of 1.0 wt% and a release agent of 5 wt%, compared to a melamine resin of 100 wt%, using a 40 mesh roll applied with the resin, and

[135] a dry process D of drying the paper impregnated through the 1st to 4th composition and impregnation processes in each dry line maintaining a temperature of 13O ⁰ C and having a transfer speed of 40 m/min.

[136] Each of the aforementioned processes will be described in more detail below:

[137] ■ 1st composition and impregnation process: S3-11 ■

[138] This process is to impregnate original paper P in a first impregnation tank 3-10. The first impregnation tank 3-10 contains a mixed resin composed of a dispersing agent of 20 wt% and a release agent of 5 wt%, compared to the weight percent of the phenol and melamine cocondensation resin.

[139] The first impregnation tank 3-10 is provided with a roll having a 60 mesh surface.

The original paper P passes the mixed resin in the first impregnation tank 3-10 and moves to be wound on the roll, so that the paper P is sufficiently impregnated with the first mixed resin is sufficiently.

[140] This process is to strengthen the binding force between the original paper P and the ink layer.

[141] ■ 2nd composition and impregnation process: S3-12 ■

[142] This process is to secondly impregnate the paper P, which is impregnated in the first impregnation tank 3-10 in the 1st composition and impregnation process S3-11, with a re-mixed resin solution. [143] In this exemplary embodiment, whenever each composition and impregnation process of the paper P is sequentially finished, the impregnated paper P is sequentially dried through the dry line D, as illustrated in the drawings. [144] After the original paper P is impregnated in the first impregnation tank 3-10, the dry process is performed when the impregnated paper P is guided to the dry line D maintaining a temperature of about 130 ⁰ C, as shown. The impregnated paper P is wound on a number of rollers which are spaced apart from one another, at the same distance, in the dry line D, to be transferred inward the dry line D and to be dried. This dry process is repeatedly performed. [145] The transfer speed of the paper P is maintained as 40 m/min. In the dry line D, the transfer speed is same. [146] To secondly impregnate the paper P, the second impregnation tank 3-20 contains a mixed resin composed of: [147] subacid silver nano particles of 5 wt% having a density of 1000 ppm and an average particle of 5 to 20 nm (nanometers), [148] methyl ethyl ketone (MEK) of 5 wt% corresponding to ketone which is technically important and used as lacquer and resin solvents and the like, [149] titanium oxide (TiO) of 70 wt% used as an optical catalyst, titanium oxide being widely applicable because it harmless to a human body and it is water-soluble, and being semi-permanently usable by one-time application, and [150] a hardening agent of 0.8 wt%, compared to the phenol and melamine cocon- densation resin of 100 wt%. [151] The second impregnation tank 3-20 includes a 60 mesh roll, to secondly impregnate the paper P firstly impregnated during the 1st composition and impregnation process

S3-11 and dried during the dry process. [152] To induce the effects of titanium oxide and silver nano particles, as described above, the density of silver nano particles to be added is 1000 ppm and the amount of titanium oxide to be added is 70 wt% compared to the phenol and melamine cocon- densation resin of 100 wt%. Further, the effect of purifying contaminants is obtained by using the antibiosis of silver nano particles and the oxidation power of titanium oxide. [153] The paper P secondly impregnated is again moved to the dry line D, to be dried at the same dry conditions. The dried paper P is impregnated in the third impregnation tank 3-30, which will be described below:

[154] ■ 3rd composition and impregnation process: S3-13 ■

[155] This process is to again impregnate the paper, which is dried in the dry line D after the 2nd composition and impregnation process S3- 12 and rolled to be transferred, in the third impregnation tank 3-30, to show the binding force between the wood panel and the synthetic resin sheet.

[156] A mixed resin contained in the third impregnation tank 3-30 is composed of a crack preventing additive of 5 wt%, a hardening agent of 0.8 wt% and a release agent of 0.7 wt%, compared to a melamine resin of 100 wt%. The secondly impregnated paper P is impregnated with the mixed resin in the third impregnation tank 3-30, using the 40 mesh roll.

[157] ■ 4th composition and impregnation process: S3-14 ■

[158] This process is to again impregnate the paper, which is dried in the dry line D at the same conditions of the temperature 13O ⁰ C and the speed of 40 m/min after the 3rd composition and impregnation process S3- 13, thereby providing a binding functional group to a surface layer of the synthetic resin sheet impregnated through the 3rd composition and impregnation process S3- 13 and thus producing an LPM synthetic resin sheet for UV high gloss.

[159] To obtain the LPM synthetic resin sheet for UV high gloss, the thirdly impregnated paper P is impregnated with a re-mixed resin in the fourth impregnation tank 3-40. The mixed resin is composed of a crack preventing additive of 5 wt%, a hardening agent of 1.0 wt% and a release agent of 5 wt%, compared to a melamine resin of 100 wt%, and thereafter by adding one or more selected from urethane of 5 wt%, isocyanate of 5 wt% and an unsaturated polyester-based resin of 10 wt% being an acid and alcohol polymerization resin.

[160] Urethane has excellent mechanical strength (such as tensile strength, tear strength, elongation percentage, resistance to wear and the like), good processing property, high elasticity, high mechanical strength and excellent resistance to wear. Therefore, in the present invention, it is most stable to add urethane of 5 wt% to the mixture, compared to the melamine resin of 100 wt%.

[161] Further, isocyanate is added for a crosslink reaction with urethane. Isocyanate is mixed at a mixing rate of 5 wt%, compared to the weight percent of the melamine resin. The unsaturated polyester-based resin which is the acid and alcohol polymerization resin is mixed, using acrylic acid-based ester which is excellent in flexibility, weatherability, binding property, and adhesion inducing property in the functional group.

[162] The fourth impregnation tank 2-400 containing the mixed resin is provided with a

40 mesh roll applied with the resin. The paper P, which is dried after the 3rd composition and impregnation process, is guided to pass the roll applied with the resin,

so that the paper P is impregnated with the mixed resin. Preferably, an additive for providing the strength of the surface layer to the surface of the roll applied with the resin may be sufficiently applied thereto.

[163] It is confirmed that the synthetic resin sheet subjected to each of the composition and impregnation processes has an impregnation amount of 220% and a moisture content of 7.5%.

[164] Further, in the 3rd or 4th composition and impregnation process, the materials of emitting far infrared rays, such as germanium and the like to be selected for the effect of emitting the far infrared rays, may be used as an additive.

[165] - Second exemplary embodiment for manufacturing a synthetic resin sheet -

[166] In accordance with the second exemplary embodiment, a high glossy synthetic resin sheet for a wood panel is obtained by using an LPM synthetic resin sheet manufactured by a process which will be described later:

[167] A method of manufacturing a general LPM impregnated paper sheet comprises: performing a first impregnation process, a second impregnation process, a dry process, a cooling process and a cutting process of cutting a product at proper dimensions. This second exemplary embodiment provides a method of manufacturing a synthetic resin sheet using an LPM, whereby the high glossy synthetic resin sheet suitable for the present invention is obtained.

[168] To manufacture the synthetic resin sheet used for high gloss when manufacturing a general LPM synthetic resin sheet, paper is firstly impregnated with a urea resin, the firstly impregnated paper is firstly dried using an infrared lamp or in a dry zone, the firstly impregnated and dried paper is secondly impregnated with a melamine resin, the secondly impregnated paper is secondly dried using a fan heater, and the secondly dried paper is cooled at room temperature.

[169] In the above-described process of manufacturing the LPM synthetic resin sheet, the urea resin is composed of one or more selected from urethane of 5 wt%, isocyanate of 5 wt% and an unsaturated polyester-based resin of 10 wt% which is an acid and alcohol polymerization resin, compared to the weight percent of the urea resin.

[170] Alternatively, the melamine resin is composed of one or more selected from urethane of 5 wt%, isocyanate of 5 wt% and an unsaturated polyester-based resin of 10 wt% which is an acid and alcohol polymerization resin, compared to the weight percent of the melamine resin.

[171] The high glossy LPM synthetic resin sheet is subjected to the 3rd process, i.e., UV coating process S3-30 (which will be described later), thereby removing the decrease of the binding force occurred in the conventional LPM synthetic resin sheet. Accordingly, there is provided the wood panel having the excellent binding force between the wood panel and the high glossy LPM synthetic resin sheet.

[172] - Third exemplary embodiment for manufacturing a synthetic resin sheet -

[173] In accordance with the third exemplary embodiment, there is provided a process of manufacturing a high glossy synthetic resin sheet for a wood panel, using an HPM synthetic resin sheet for high gloss.

[174] On any one surface of the HPM synthetic resin sheet for high gloss, paper or a fiber material having a natural and/or artificial image as printed is impregnated with a melamine resin and a phenol resin, which are thermo setting resins, and is stacked to be hot-pressed at 50 kgf/D or more, using a multi daylight press, and to be formed.

[175] Specifically, the melamine resin for impregnation is prepared by the basic catalysis of a white crystallized powder resin and a formalin aqueous solution, and the phenol resin for impregnation is prepared by the addition reaction of the phenol formalin aqueous solution by adding ammonia or sodium hydroxide.

[176] Each of the melamine resin and the phenol resin for impregnation is composed of one or more selected from urethane of 5 wt%, isocyanate of 5 wt% and an unsaturated polyester-based resin of 10 wt% which is an acid and alcohol polymerization resin, compared to the weight percent of each resin. The paper or fiber material is impregnated with each of the melamine resin and the phenol resin and is dried through the well known processes, so that the high glossy synthetic resin sheet using the HPM is obtained.

[177] 2nd process: Hot-pressing process S3-20

[178] In this process, when the high glossy synthetic resin sheet obtained in each exemplary embodiment of the 1st process, i.e., the synthetic resin sheet manufacturing process S3- 10, is provisionally fixed to the surface of the wood panel, hot-pressing is performed at pressure of 20 to 22 kgf/D, at a temperature of 180 ⁰ C, for 40 to 60 seconds.

[179] In the state that the high glossy synthetic resin sheet obtained by this process is in contact with the surface of the wood panel used for furniture materials, flooring plywood and the like, the high glossy synthetic resin sheet is hot-pressed at 20 kgf/D, at about 18O ⁰ C, for 40 to 60 seconds, to be bonded together. Accordingly, there is provided the wood panel as a board material having the good binding force of the synthetic resin sheet.

[180] 3rd process: UV coating and hardening process S3-30

[181] When the synthetic resin sheet and the wood panel are bonded together by the 2nd process, i.e., the hot-pressing process S3-20, the surface of the wood panel to be processed is D/S-coated at primary painting and hardened by a UV lamp in this 3rd process. This process is to provide the effect of high gloss on the surface of the synthetic resin sheet. When the wood panel having its surface bonded with the impregnated synthetic resin sheet is loaded in a tray 100 and is transferred by a caterpillar

transfer unit, such as a conveyer, the surface of the wood panel, that is, the surface of the synthetic resin sheet, is coated with a UV coating resin solution (D/S solution used at primary painting) by a resin supply unit 3-110, to form a uniform coating resin layer Pl, and is hardened by the UV lamp unit.

[182] The UV coating resin solution used in the present invention is composed of an unsaturated polyester resin which is an ester-based resin as an acid and alcohol polymerization resin : an acrylic resin : a monomer (acrylate) having a reaction accelerator having a mixing rate of 8 : 1 : 1.

[183] The UV coating resin solution mixed by the above mixing rate is evenly applied to the surface of the wood panel loaded in the tray 100 to be transferred. Further, while the UV lamp irradiates on the surface of the wood panel, the surface layer thereof is hardened, thereby producing the wood panel with the high glossy surface.

[184] The invention has been described using preferred embodiments. However, it is to be understood that the scope of the invention is not limited to the disclosed embodiments. On the contrary, the scope of the invention is intended to include various modifications and alternative arrangements within the capabilities of persons skilled in the art using presently known or future technologies and equivalents. The scope of the claims, therefore, should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements. Industrial Applicability

[185] In accordance with the present invention, there is provided the wood panel using the high glossy synthetic resin film/sheet, thereby providing the high glossy surface and the increased resistance to impact, water and heat and creating the effect of the feeling of a natural material. When the wood panel produced through each process is used as flooring plywood and the like, the flooring increases its hardness, resistance to scratch, and properties, decreases its deformation rate, and improves its moisture content, durability and the like. Furthermore, as the processes of manufacturing the wood panel are shortened, the production cost is significantly reduced. Accordingly, the present invention has the industrial applicability and satisfies the user's expectation.