KR20070056009A - Process of Preparing Wood Plastic Composite Panel with the Appearance and Texture Similar to Natural Lumbers and Apparatus therefore - Google Patents

Abstract

The present invention provides a panel manufacturing process for producing a panel by extruding and cooling a resin composite so that wood fibers are uniformly dispersed in a synthetic resin matrix, and a tree pattern corresponding to a cut surface of natural wood on the surface of the panel at a predetermined depth. A method of manufacturing a composite wood panel panel comprising an embossing step of forming and a brushing step of forming a fine fine line in a predetermined depth by removing a part of the synthetic resin layer on the surface of the panel, and can be efficiently executed. It provides a synthetic wood board manufacturing apparatus.

The method of manufacturing a composite wood panel panel according to the present invention, while realizing a wood pattern having the same appearance and texture as the cut surface of natural wood directly on the surface of the synthetic wood, at the same time can maximize the advantages of the material itself consisting of wood fibers and synthetic resin have. In addition, it is possible to minimize the increase in manufacturing cost due to post-processing by omitting the conventional process of post-processing a panel cut to a predetermined size after extrusion for surface treatment without being affected by the extrusion speed. have.

Description

Process and Preparation of Synthetic Wood Panel Panel with Appearance and Texture of Natural Wood {Process of Preparing Wood Plastic Composite Panel with the Appearance and Texture Similar to Natural Lumbers and Apparatus therefore}

1 is a schematic diagram of a series of configurations of a composite wood board manufacturing apparatus according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the surface treatment apparatus of FIG. 1; FIG.

FIG. 3 is a partial schematic view of one exemplary internal structure of embossing roll in FIG. 2;

4A and 4B are schematic views for performing a brushing process on the upper and lower surfaces and both sides of the panel by the brushing roll in FIG. 2;

FIG. 5A is a planar photograph of a panel in which an embossed structure of a wood cut pattern is formed on a surface in Example 1, and FIG. 5B is a planar enlarged photograph of a panel in which the embossed structure is again formed with a linear uneven structure;

5C and 5D are planar photographs and cross-sectional enlarged photographs taken from side surfaces of the synthetic wood board in Example 1. FIG.

The present invention relates to a method and apparatus for manufacturing a composite wood panel panel having a similar appearance and texture to natural wood, and more particularly, to extrude and cool a resin composite to evenly disperse wood fibers having a predetermined size in a synthetic matrix. After forming in the form of a panel, the embossing process of heating and pressing the wood pattern corresponding to the natural wood on the surface of the panel and the brushing process of forming a fine roughness of the line is compared to the appearance and texture of the natural wood A method of manufacturing a composite wood panel panel and an apparatus therefor.

Building materials using natural wood have the disadvantage of easily damaging their original form or texture due to water or sunlight. Therefore, a lot of research has been made on the development of synthetic wood that can compensate for the disadvantages of such natural wood. Such synthetic wood is mixed with granules or pellets (wood pellets) and synthetic resin at a certain magnification, and further mixed with various additives according to the product use, it is made into a panel-shaped product using a process such as extrusion or injection.

However, the synthetic wood board thus manufactured is made of a unique resin because of the synthetic resin, which is a matrix component of the resin composite, after extrusion to form an outer layer on the surface of the board, in spite of the use of wood fibers as a filler, due to the oily touch and high gloss peculiar to plastic. It does not exert its appearance and texture. Therefore, various efforts have been made to solve the shortcomings of the synthetic wood board.

Thus, as an attempt to express the natural appearance or surface texture of the natural wood in the synthetic timber board, for example, by using co-extrusion using pigments of different colors, the method of processing the wood pattern by hand, wood Background Art A method of transferring or printing a pattern, or a method of laminating a film having a wooden pattern of solid wood or artificial material, and the like are used. However, these methods generally have disadvantages such as complicated manufacturing process and in some cases durability problems.

In order to solve the above problems, new methods have been proposed to give the surface of the synthetic wood most similar to the cut surface of the natural wood. As a representative example, it is repeated by pressing or high-speed rotation by using a circular roll in which a constant intaglio and an embossed pattern are imprinted in the direction of the plate surface in the vertical upper portion of the synthetic wood proceeding in a predetermined direction using a power transmission device. There is a method of forming an embossed pattern. The method of forming the embossed wood pattern on the surface may be performed after cutting the extruded panel to a predetermined size.

However, these synthetic timber boards provide the surface with patterns similar to wood patterns, but exhibit high gloss and induce an oily feel peculiar to synthetic resin when touched by hand. There is a limit to providing appearance and texture.

In general, a natural wood board made by processing wood directly provides excellent appearance and texture when its surface is smoothly processed. Therefore, the natural wood board used for interior and exterior decoration of a building is a high-quality product with sophisticated surface treatment. Are used. Such surface-treated natural timber boards not only show beautiful wood patterns, but are smooth and soft to the touch, and there is no difficulty in expressing wooden patterns due to proper glossiness. This is due to the complex action of natural wood tissue and the unique properties of the cellulose polymers that make up the tree.

On the other hand, when the surface of the synthetic wood is smoothly treated like natural wood, it exhibits a high gloss and an oily feel peculiar to the synthetic resin.

Therefore, while using a resin composite made of synthetic resin and wood fibers as a material, there is a high need for a technology that can express the appearance and texture similar to the cut surface of natural wood.

The present invention aims to solve the above-mentioned problems of the prior art and technical problems that have been requested from the past.

That is, the first object of the present invention is to exclude printing methods such as inkjet printing, roll printing, post-processing methods such as laminating a decorative sheet on a cut wood board, and the like. It provides a method of manufacturing a composite wood panel panel that can maximize the advantages of the material itself made of wood fibers and synthetic resin while at the same time embodying a wooden pattern having the same appearance and texture as the incision surface.

The second object of the present invention is to omit the conventional process of post-processing a panel cut to a standard size after extrusion for the surface treatment again, so that the manufacturing cost due to post-processing by directly surface treatment in the extrusion process without being affected by the extrusion speed It is to provide a method for producing a composite wood panel panel that can minimize the rise.

It is a third object of the present invention to provide an apparatus for manufacturing a composite wood board which can effectively perform the above method.

Method for producing a composite wood panel panel according to the present invention for achieving this object,

(a) a panel manufacturing process for producing a panel by extruding and cooling the resin composite so that wood fibers are uniformly dispersed in the synthetic resin matrix;

(b) an embossing process for forming a tree pattern corresponding to the cut surface of natural wood on the surface of the panel to a predetermined depth; And

(c) a brushing process of forming a linear fine roughness with a predetermined depth by removing a part of the synthetic resin layer on the panel surface;

It is configured to include.

The manufacturing method according to the present invention realizes the appearance and texture corresponding to the cut surface of the natural wood without printing, sheet lamination, etc. on the surface of the panel, preferably, before cutting (cutting) the panel into the form of a plate Surface treatment is performed by an embossing process and a brushing process, and the whole process can be shortened significantly.

Therefore, the manufacturing method of the present invention preferably proceeds in a continuous process, where the continuous process means that a series of processes are performed without separating the panel from the manufacturing process, and some steps are performed to optimize the process. It does not exclude the addition in between. Thus, as described later, for example, a process of preheating the panel before the embossing process may be added, and a process of cooling the panel before the brushing process may be added.

The manufacturing method according to the present invention is also characterized in that the surface of the panel is formed together with the embossed structure of the wood cut surface pattern with the predetermined depth and the linear uneven structure of the predetermined depth.

That is, when the embossed structure and the linear micro-convex structure are formed together on the surface of the resin composite panel based on the synthetic resin, surprisingly, despite the cut surface and the other surface structure of the natural wood, It was confirmed that it can be provided. Accordingly, the manufacturing method of the present invention to provide a method for producing a synthetic wood board of a novel structure in another aspect.

In this regard, in the related art, hot plate molding is conventionally used to form an embossed pattern having a predetermined depth on a synthetic wood board, or the surface of the manufactured synthetic wood is pressed to perform post-processing such as printing or painting. There is a disadvantage in that the size of the mold is limited and the production efficiency is low and the manufacturing cost is high. In addition, it is difficult to form an embossed pattern of a desired depth by the post-processing process, and fine cracks or cracks may occur in the synthetic wood board, resulting in low quality, complicated manufacturing processes, and increased manufacturing costs. There was a problem.

On the other hand, the production of synthetic wood by the extrusion method has the advantage of high production efficiency and low manufacturing cost, but the deformation of the panel itself in the process of pressing and heating using embossing roll to form the embossed pattern is caused by bending Since there is a problem that the phenomenon occurs, which is not applied to the actual manufacturing process, it was not possible to manufacture an embossed pattern having a predetermined depth, such as the wood grain pattern of natural wood as in the present invention.

Thus, the inventors of the present application, after repeatedly performing various experiments and in-depth studies, in the process of forming the embossed pattern on the surface of the extruded panel, in addition to the surface requiring the formation of the embossed pattern, the pressing and heating on the opposite surface, deformation Since it can be prevented to form an embossed pattern having a predetermined depth, such as a solid wood incision surface pattern, it was confirmed that it is possible to produce a high-quality synthetic wood board by the extrusion molding method.

Therefore, in order to prevent deformation of the panel, such as warpage, preferably, heating and pressurization are simultaneously performed on the opposite surface of the panel surface on which the embossing is performed during the embossing step (b).

The method of heating and pressurizing the said opposing surface is not specifically limited, For example, it can carry out using a roll type heating apparatus, such as a support roll, or a plate type heating apparatus.

In the step (a), the resin composite to be extruded is composed of a synthetic resin as a matrix component and wood fibers as a filler. The synthetic resin is not particularly limited as long as it is a polymer having excellent compatibility with wood fibers and providing excellent strength and durability by itself, and preferably, polyolefin-based polymers such as polyethylene, polypropylene, and polystyrene may be used.

The wood fiber is a finely ground wood powder or recycled wood, such as granules, pellets, etc., pulverized small, and other natural fibers (for example, Hemp, Flex, Jute, Kenaf, Cellulose, etc.) cut to a constant length It is a concept including all, and may vary depending on the use of the synthetic wood board, but may preferably be used in about 20 to 80% by weight, preferably 30 to 50% by weight based on the total weight of the resin composite. However, if the content of the wood fiber is too small, the content of the synthetic resin is too high to provide the appearance or texture corresponding to the natural wood, on the contrary, if too much, the desired degree of the bond strength between the wood fibers due to the decrease in the content of the synthetic resin It is difficult to provide its strength and durability.

The size of the wood fibers is 20 to 300 mesh, preferably 90 to 150 mesh. If the size of the wood fiber is too large, it may cause problems such as the strength of the panel, etc. On the contrary, if the size of the wood fiber is too small, the distribution in the resin composite is not uniform, in particular, embossed structure and Despite its fine structure, it does not provide the desired appearance and texture.

In general, in the melt extrusion process, the resin is added to the hopper in the form of pellets, and then melted in a heated extruder to be mixed with other components. Thus, the resin composite of the present invention may be, for example, adding a resin pellet and wood fiber to the hopper, respectively. To mix in an extruder.

Various components may be added to the resin composite depending on the use. Typically, 1 to 5% by weight of the pigment may be added based on the total weight of the resin composite to provide a variety of colors for each type of wood, and among them, there is little possibility of discoloration by sunlight or the like, so that the original color is long Particular preference is given to sustainable inorganic pigments. These pigments may be used alone, but in some cases, may be used in combination of two or more to express various colors.

The pigments may preferably be injected via the main hopper or the coder in the form of a master batch, for example pellets, such that the resin of the pigment-containing master batch is the same or different from the synthetic resin of the matrix component. Can be. Preferably it can be used in the production method of the present invention in the form of a master batch in which an inorganic pigment is added to the same resin as the synthetic resin constituting the matrix.

As one example, the synthetic resin of the matrix component has a Melt Index (MI) of 1.0 to 10.0, the resin of the pigment-containing master batch has a melt index of 1 to 30, and through the Main Hopper By being supplied together and uniformly mixed by mechanical mixing by the melting temperature of the extruder barrel (barrel) or the screw inside the barrel, it is possible to implement the color of the cut surface according to the species of natural wood.

In some cases, a master hopper B containing a pigment of a different color from the pigment is contained in a resin having a lower melt index than that of the pigment-containing master batch A supplied through the main hopper. By feeding through), it is also possible to produce panels in which the pigment color of the master batch (B) does not mix completely with the pigment color of the master batch (A) and forms an inhomogeneous boundary.

Extrusion and calibration and cooling for the manufacture of the panel can proceed in a conventional manner.

Preferably, the panel exiting the extruder die is transferred to an embossing process using a power transmission device such as a takeover machine.

The embossing process of step (b) is a first surface treatment step of forming a wood pattern ("wood cutting surface pattern") appearing on the cross section when the wood is cut on the surface of the panel with an embossed and intaglio embossing structure. This process can preferably be achieved by heat pressing the embossing roll on the surface of the panel with the solid wood incision pattern imprinted on the surface.

In order to form a solid wood cut surface pattern on the surface of the panel, the surface of the panel must be heated to a temperature before and after its melting point, which can be achieved by heating simultaneously with pressurization by a heated embossing roll.

In one preferred embodiment, the embossing process of step (b) heats the surface of the panel to a temperature of 120 to 200 ° C. while rotating a heated embossing roll in which the shape corresponding to the wood cut surface pattern is imprinted on the surface. In this case, a solid wood incision pattern can be formed on the surface of the panel by pressurizing it to a pressure greater than 10 bar or less.

In some cases, a preheating step of heating to a predetermined temperature before the embossing process may be added to prevent deterioration and / or deformation of the surface state due to instantaneous heating. In general, since the melting point of the resin composite when using the polyolefin as the matrix resin is approximately 120 to 180 ° C, the preheating is preferably about 100 to 200 ° C so that the desired temperature can be easily reached by heated embossing rolls.

This preheating process can be accomplished by a variety of means, preferably using an infrared heater. Heated embossing rolls transfer heat while contacting the panel with a small contact interface, but preheating can be performed by a large area surface heating method, which reduces the burden of rapid heating by the heated embossing rolls and enables even heating. have.

The depth of the embossed structure formed in the embossing process may vary depending on various factors such as the temperature, pressure, and rotational speed of the embossing roll even when the depth of the shape imprinted on the surface of the embossing roll is appropriate. You can adjust to get the desired depth.

Preferably, the method may further include a cooling process for cooling the panel after the embossing process. The cooling process may be various, such as air-cooled by compressed air, water-cooled by water.

In the step (c), the brushing process is a second surface treatment process of removing a portion of the synthetic resin layer from the surface of the panel on which the embossed structure is formed to form linear fine irregularities to provide a panel having a predetermined surface roughness and low gloss. This process can be achieved by rotating the brushing roll on the surface of the panel, preferably a plurality of iron cores having a predetermined thickness and length, which are regularly or irregularly formed on the outer surface.

By the brushing process, some synthetic resin layers on the surface of the panel are removed and, in some cases, the wood fibers are exposed to the outside, and a linear micro-convex structure is formed on the surface of the panel in the rotational direction of the brushing roll. The depth of the linear microconvex structure can be determined by various factors such as the thickness of the core, the length, the rotation speed of the roll, and the distance between the panel and the roll.

The brushing process is mainly performed on the upper surface of the panel, but may also be performed on the lower surface and / or the side surface in some cases.

Although the embossed structure of the panel provides a beautiful pattern of the natural wood cut surface, due to the unique properties of the synthetic resin composite, such embossed structure alone cannot provide the appearance and texture corresponding to the natural wood cut surface. Therefore, the surface microstructure of the embossing structure is changed by forming the linear micro-convex structure on the embossing structure by the brushing process, but the resulting composite structure corresponds to the cut face of the natural wood while compensating for the fundamental disadvantage of the synthetic resin composite. It allows the appearance and texture to be expressed.

On the other hand, in the case of forming only the linear micro-convex structure on the surface of the panel by the brushing process without the embossing process, the unique physical properties of the synthetic resin, that is, the oily feel and high gloss, can be diluted. In particular, it does not provide a beautiful appearance. Moreover, it was confirmed that such an embossed structure and a linear microconvex structure can obtain a desired effect when the following specific conditions are satisfied.

Specifically, the average depth of the embossed structure is 200 to 900 µm, preferably 500 to 600 µm, and the average depth of the linear microconvex structure is 10 to 500 µm, preferably 200 to 300 µm, and 60 ° to the surface. When having a reflectance of 10 to 50%, preferably 10 to 30% at light incidence of (incidence angle), the appearance and texture comparable to natural wood can be obtained even when a resin composite based on synthetic resin is used as a material.

When the depth of the embossing structure is too small or large, the spacing between the protrusions in the embossing structure is too narrow or wide, the oily feel of the synthetic resin is increased and the light reflectivity of the surface is increased, so that the appearance and texture of the natural wood can be exhibited. I can't.

In addition, when the depth of the fine concave-convex structure is too small, the effect of removing the oily touch of the synthetic resin is small, and on the contrary, when the depth is too large, the damage to the pattern corresponding to the pattern of the natural wood becomes large, which is not preferable.

The fine concave-convex structure is added to the surface in a linear form, unlike the embossed structure of the wood cut surface pattern. Preferably it may be added parallel to the wood grain of the wood cut surface pattern.

When the light reflectance obtained due to the embossing structure and the fine concavo-convex structure is too large, it is difficult to provide an appearance as in the cut face of natural wood due to the increase of gloss. On the other hand, when the depth of the embossed structure and the fine roughness structure is increased, low light reflectance can be obtained, but it is not preferable because the surface roughness becomes too large accordingly.

Synthetic wood panel panel produced by the method according to the invention can be cut (cut) to a predetermined size and shape can be used for the intended use.

The present invention also provides a composite wood board manufacturing apparatus that can efficiently perform the above production method.

An apparatus for producing a synthetic wood board according to the present invention includes an extrusion apparatus for extruding a resin composite to produce a panel; A cooling device for cooling the panel; A take-out device which takes out the cooled panel and transfers it to a subsequent process; A surface treatment apparatus for performing an embossing process and a brushing process on the surface of the panel; And a cutting device for cutting (cutting) the surface-treated panel to a predetermined size and shape.

The apparatus according to the invention is characterized in that the embossing process and brushing fixation are sequentially performed in the surface treatment apparatus, and the surface treatment apparatus is installed before the cutting apparatus.

The extrusion device, cooling device, take-out device and cutting device and the like are the same or very similar to those of other synthetic wood board manufacturing equipment. The take-out device removes the panel from the cooling device and transfers it to the subsequent surface treatment device to provide an actuation driving force in the surface treatment device.

The surface treatment apparatus according to the present invention includes a heated embossing roll having an embossed structure in which a shape corresponding to a wood cut surface pattern is imprinted on a surface of a roll so that an embossed structure can be formed on a surface of a panel by heating and pressing. The iron core is formed on the outer surface of the roll so as to form a linear micro-convex structure again on the surface of the panel, and comprises a brush roll which rotates at high speed.

The heated embossing roll, preferably, embossed and intaglio in the shape corresponding to the wood cut surface pattern is formed on the surface of the roll, and includes a pressure control unit to be pressed to the panel at a constant pressure, a plurality of electric The heating rod is mounted in the direction of the rotation axis of the roll, and the heating oil heated by the heating rod is configured to maintain the temperature of the entire roll uniformly while circulating inside the roll. The pressure control unit serves to press the embossing roll on the surface of the panel by hydraulic or pneumatic pressure. In some cases, the embossing roll may further include a thermocouple for preventing overheating, in which case the thermocouple may be radially mounted in a direction parallel to the axis of rotation of the roll, similar to the heating rods. .

Since the panel has a melting point that varies depending on the type of synthetic resin, the type and size of the wood fibers, their content, and the like, the desired heating temperature can be determined by adjusting the amount of electricity applied to the heating rod. The pressure of the roll applied to the panel to form the embossed structure can also be determined by various factors and can be less than 10 bar as a pressure greater than atmospheric pressure (about 1 bar).

The heated embossing roll may include a separate power unit to be capable of rotating on its own, but preferably, the roll pressurized onto the panel in a non-powered state rotates with the movement of the panel, thereby transferring the wood cut surface pattern to the surface of the panel. It can be configured in a way.

In the case of such a non-powered embossing roll, a driving roll, which preferably maintains the feeding speed of the panel, may be further installed in front of the embossing roll. Since the driving roll provides driving force to the panel in contact with the panel, in some cases, the driving roll may be configured to include a heating rod and hot oil in the driving roll to preheat the panel.

In one preferred example, in order to increase the efficiency of the embossing process by the embossing roll, a separate preheating part may be included between the driving roll and the embossing roll. Since the embossing rolls heat the panel through a small contact interface with the panel, a preheating section made of a contact or non-contact planar heating structure is more preferable as a means for heating the panel.

An air-cooled or water-cooled chiller is preferably provided between the embossing roll and the brushing roll, so that the panel heated by the embossing roll can be cooled to effectively remove the synthetic resin layer from the surface of the solidified panel. The cooling device may preferably be a compressed air injection device for cooling as an air-cooled cooling device.

Preferably, it may include a guide roll for transporting the panel in a pressurized state at the rear of the cooling device to prevent deformation of the panel due to residual heat and stress present in the panel cooled by the cooling device. .

The brushing roll has a structure in which a plurality of iron brushes having a predetermined thickness and length are regularly (or irregularly) formed on the outer surface of the roll and are rotated at high speed. The direction of rotation of the brush roll may be set in the forward or reverse direction to the moving direction of the panel.

In addition, when it is necessary to perform the brushing process on both sides as well as the upper and lower surfaces of the panel, for example, a pair of first brushing rolls for performing the brushing process on the upper and / or lower surfaces; By continuously mounting two pairs of brushing rolls of a pair of second brushing rolls for performing a brushing process on both sides, the brushing process can be performed in a series of continuous processes on a desired side of the panel.

In the above-mentioned brosing roll, the thickness and length of the iron core, the rotational speed of the brushing roll, the distance to the panel, and the like are deeply related to the depth of the linear fine concavo-convex structure formed on the panel. Therefore, since they may vary depending on the depth of the linear fine irregularity structure to be formed on the panel, the depth of the linear fine irregularity structure can be adjusted by, for example, the following method.

(Ⅰ) How to adjust the thickness of the iron core

(Ii) by adjusting the length of the iron core

(Iii) Adjusting by changing the rotation speed of brushing roll

(Iii) by varying the distance between the bristle roll and the panel, ie the length of the iron core in contact with the panel.

(Iii) selecting and adjusting two or more of the above methods (iii) to (iii)

For example, a brushing roll with iron cores having a thickness of 0.1 to 0.5 mm and a length of 10 to 50 mm (the length exposed from the surface of the roll) is formed with a panel and -10 to 0 mm (the core of the core contacting the panel). By rotating at 50 to 500 rpm at intervals of 0 to 10 mm in length to form a linear micro-convex structure of a desired depth on the panel.

The brush roll may vary depending on the number of outer surfaces of the panel to be surface-treated, and in the case of treating all surfaces, a pair of brush rolls for treating the upper and lower surfaces of the panel and both sides of the panel Another pair of brushing rolls may be provided.

Since the surface of the panel which has undergone the brushing roll contains a lot of powder cut off, a washing device for removing the powder may be installed. The washing device may be, for example, a compressed air spraying device.

The present invention also relates to a surface treatment apparatus used in the composite wood board manufacturing apparatus.

Surface treatment apparatus according to the present invention, for example, a drive roll for maintaining a constant feed speed of the panel; A preheater for heating the panel to a predetermined temperature; Embossing rolls to perform the embossing process; A chiller for cooling the heated panel; Guide rolls for suppressing deformation of the panel; And a brushing roll having a plurality of iron cores formed on the outer surface of the roll and rotating at a high speed so as to form the preceding micro-convex structure again on the surface of the panel on which the embossed structure is formed. Details are as described above.

Hereinafter, the apparatus for producing a synthetic wood board of the present invention will be described in detail with reference to the drawings, but the scope of the present invention is not limited thereto.

1 schematically shows a series of configurations of a composite wood board manufacturing apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the apparatus 100 for manufacturing a synthetic wood board includes an extrusion apparatus 200 for extruding a resin composite to form a panel, a cooling apparatus 300 for cooling an extruded panel, and a cooled panel. A take-up device 400 for drawing and transferring to a subsequent process, a surface treatment apparatus 500 for performing an embossing process and a brushing process on the surface of the panel, and a cutting device 600 for cutting the surface-treated panel to a predetermined size and shape. Consists of

Since the extrusion apparatus 200, the cooling apparatus 300, the drawing apparatus 400 and the cutting apparatus 600 are the same or very similar to those of the prior art, only the surface treatment apparatus 500 will be described with reference to FIG.

Referring to FIG. 2, the surface treatment apparatus 500 includes a driving roll 510 for maintaining a constant feeding of the panel 700, a preheating part 520 for heating the panel 700 to a predetermined temperature, and an embossing process. The embossing roll 530 to perform the cooling, the compressed air injection unit 540 for cooling the heated panel 700, the guide roll 550 to suppress the deformation of the panel, the top and bottom surfaces of the panel 700 A pair of first brushing rolls 560 performing a brushing process for the pair, a pair of second brushing rolls 570 performing a brushing process for both sides of the panel 700, and a panel 700 after the brushing process Compressed air jet 580 for removing the cut powder remaining on the outer surface, and a plurality of side rotating rolls 590 abutting the side of the panel 700 with a vertical axis of rotation to guide the movement of the panel 700. Consists of.

The driving roll 510 and the embossing roll 530 are respectively provided with pressure controllers 511 and 531 at the upper part thereof so as to be in contact with the panel 700 while being pressed at a constant pressure. Support rolls 512 and 532 are located on opposite surfaces.

Compared to the heating of the panel 700 by the small contact interface of the embossing roll 530, the preheating unit 520 has a planar heating structure, so that the heating efficiency is more excellent, and preferably, a non-contact infrared heater as shown in the drawing. consist of.

The embossing roll 530 is heated and is formed on the surface of the embossed and intaglio 533 in the shape corresponding to the wood cut surface pattern, a plurality of electric heating rod 534 is mounted in the rotation axis direction of the roll, The heat flow oil heated by the heating rod 534 is configured to maintain the temperature of the entire roll uniformly while circulating the inside of the roll.

The support roll 532 is configured to be the same as or similar to the embossing roll 530, and uses the support roll 532 while heating and pressing the surface of the panel 700 using the embossing roll 530. Accordingly, the opposite surface of the panel 700 may also be heated and pressed to form an embossed pattern having a predetermined depth while preventing deformation of the panel 700.

3 is a partial schematic view of one exemplary internal structure of embossing rolls. Referring to FIG. 3, a plurality of electric heating rods 534 are mounted to the roll 536 radially parallel to the rotation axis 535, and the heating rods 534 are supplied by the electric heater module 537. It is heated by electricity and prevents overheating by a thermocouple 538, which is also mounted to roll 536. The thermocouples 538 may also be mounted to the roll 536 radially parallel to the axis of rotation 535, similar to the electrical heating rods 534.

Referring back to FIG. 2, since the panel 700 which has completed the embossing process by the embossing roll 530 is heated, the panel 700 is cooled by the air of the compressed air injection unit 540 to perform the subsequent blushing process. do.

In this heating and cooling process, the panel 700 partially retains residual heat and is pressurized by the embossing roll 530 so that thermal stress remains. Accordingly, since the panel 700 may be deformed, such as bending, the panel 700 may be deformed by releasing thermal stress and the like by the guide rolls 550 located on the surface and the opposite surface of the panel 700.

The first brushing roll 560 and the second brushing roll 570 have the same basic structure. For example, a plurality of iron cores 562 are formed on the outer surface of the roll 561.

As shown in FIGS. 4A and 4B, the brush rolls 560 and 570 rotate at a high speed by the motors 563 and 573, and the brush rolls 560 and 570 perform a brushing process on the upper and lower surfaces and both sides of the panel 700. The rotation direction may be forward or reverse with respect to the traveling direction (arrow) of the panel 700. In this brushing process, the iron cores 562 and 572 of the brushing rolls 560 and 570 pass quickly through the surface of the panel 700 to cut the synthetic resin of the surface to form fine irregularities.

Hereinafter, the content of the present invention will be described with reference to embodiments according to the present invention, but the scope of the present invention is not limited thereto.

Example 1

In the extrusion apparatus 200 of FIG. 1A, 100 parts by weight of polyethylene as a matrix component, 85 parts by weight of coniferous wood powder as filler, 5 parts by weight of Iron Oxide (red) as inorganic pigment, 5 parts by weight of lubricant, 10 parts by weight of the binder was added followed by melt extrusion. Then, after performing the embossing process and the brushing process on the surface of the panel in the surface treatment apparatus 500 of Figure 1a, to cut a predetermined size in the cutting device 600 to produce a composite wood board.

The embossing process was carried out at a roll rotation speed of 80 rpm at a temperature of 180 ° C and a pressure of 5 bar. The brushing process was performed by rotating the brushing roll having a plurality of cores 0.3 mm long and 50 mm thick on the outer surface at high speed at 300 rpm.

In FIG. 5A, a planar photograph of a panel in which an embossed structure of a wood cut surface pattern is formed on a surface thereof is disclosed in the manufacturing process as described above. The picture is shown. As shown in FIG. 5B, a plurality of fine irregularities are formed in a linear shape on a wood cut surface pattern in a direction parallel to it.

5C and 5D, planar photographs and cross-sectional enlarged photographs of side surfaces of the finally manufactured synthetic wood board are disclosed, respectively. As shown in Figure 5c, it can be seen that the linear micro-concave structure is formed along the embossing structure of the wood incision surface pattern, this embossing structure has a depth of about 600 to 850 ㎛ as shown in Figure 5d You can check it. Of course, the depth of the embossed structure can be appropriately adjusted according to the conditions of the process.

[Examples 2 to 4]

Synthetic wood board was prepared in the same manner as in Example 1 except that the brushing process was performed at 300 rpm by varying the length and thickness of the iron core in the brushing roll. The conditions of such a brushing process are shown in Table 1 below.

The reflectance was measured by injecting light at an angle of incidence of 60 占 to any 12 places in the same area on the surface of the manufactured synthetic wood board. In addition, 10 people were informed of the evaluation value of 5.0 for the surface appearance and feel of the wood boards of cherry (cherry), and the relative evaluation values of the synthetic wood boards of Examples 2 to 4 were determined. . The results are shown in Table 1 below, respectively.

TABLE 1

As shown in Table 1, although slightly vary depending on the conditions of the brushing process, the overall reflectance is lowered, and in particular, the satisfaction with the surface texture is very high, about 95% or more of the natural wood board. .

As described above, the method for producing a composite wood panel panel according to the present invention, while realizing a wood pattern having the same appearance and texture as the cut surface of the natural wood directly on the surface of the synthetic wood, at the same time the material itself made of wood fibers and synthetic resin To maximize the benefits. In addition, it is possible to minimize the increase in manufacturing cost due to post-processing by omitting the conventional process of post-processing a panel cut to a predetermined size after extrusion for surface treatment without being affected by the extrusion speed. have.

Those skilled in the art to which the present invention pertains will be able to perform various applications and modifications within the scope of the present invention based on the above contents.

Claims (16)

(a) a panel manufacturing process for producing a panel by extruding and cooling the resin composite so that wood fibers are uniformly dispersed in the synthetic resin matrix; (b) an embossing process for forming a tree pattern corresponding to the cut surface of natural wood on the surface of the panel to a predetermined depth; And (c) a brushing step of forming a linear fine roughness with a predetermined depth by removing a part of the resin layer on the panel surface; Method of manufacturing a composite wood panel panel comprising a. The method according to claim 1, wherein in the embossing step (b), heating and pressurization are simultaneously performed on the surface of the panel and the surface opposite to the panel (the "opposing surface"). The method of claim 1, further comprising a cutting step (d) for cutting (cutting) a panel having fine irregularities formed by the brushing step (c) into a predetermined size and shape according to a desired use. Manufacturing method. According to claim 1, wherein the resin composite comprises a polyolefin-based polymer constituting the synthetic resin matrix and 30 to 50% by weight of the wood fiber based on the total weight of the resin composite, the wood fiber has a size of 90 to 150 mesh Manufacturing method characterized in that. The method of claim 1, wherein a pigment-containing masterbatch is further added to the resin composite. 6. The method according to claim 5, wherein the pigment-containing master batch is obtained by adding an inorganic pigment to the same resin as the synthetic resin constituting the synthetic resin matrix. The method according to claim 1, wherein the embossing step (b) heats the surface of the panel to a temperature of 120 to 200 ° C while rotating a heated embossing roll in which a shape corresponding to a solid wood cut surface pattern is imprinted on the surface. A manufacturing method characterized by being achieved by pressurizing at a pressure of greater than or equal to 10 bar. The method of claim 1, wherein before the embossing step (b), a preheating step of preheating the panel surface to a predetermined temperature is further performed by heating to 100 to 200 ° C. by an in-plane heating method using an infrared heater. Manufacturing method. The method according to claim 1, wherein after the embossing step (b), an air cooling method of cooling the panel by adding compressed air is further performed. The method according to claim 1, wherein the brushing process (c) is performed on the upper and lower and / or side surfaces of the panel. An apparatus for performing an embossing process and a brushing process on the surface of a panel formed by extruding the resin composite according to claim 1, comprising: a driving roll which maintains a constant feeding speed of the panel; A preheater for heating the panel to a predetermined temperature; Embossing rolls to perform the embossing process; A chiller for cooling the heated panel; Guide rolls for suppressing deformation of the panel; And a brushing roll having a plurality of iron cores formed on an outer surface of the roll so as to form a linear micro-convex structure again on the surface of the panel on which the embossing structure is formed. Surface treatment apparatus of a synthetic wood board comprising a. 12. The surface treatment apparatus as claimed in claim 11, wherein the driving roll includes a heating rod and a heated oil therein to preheat the panel. 12. The surface treatment apparatus as claimed in claim 11, wherein the preheating device has a surface heating structure. 12. The method of claim 11 wherein the embossing roll comprises a plurality of electrically heated rods electrically heated and a thermocouple to prevent overheating, wherein the heated rods and thermocouples are radially mounted parallel to the axis of rotation of the roll. Surface treatment apparatus characterized in that. 12. The surface treatment apparatus according to claim 11, wherein the cooling apparatus is a compressed air injection apparatus for cooling. 12. The surface treatment apparatus as claimed in claim 11, wherein the surface treatment apparatus further comprises a compressed air spray device as a cleaning apparatus for removing the cut powders remaining on the surface of the panel which has undergone the brushing roll.

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