KR102583114B1 - Knot-removed natural wood and its manufacturing method - Google Patents

Abstract

The present invention relates to knot-removable natural wood and a method of manufacturing the same. More specifically, the present invention relates to a knot-removing natural wood and a method of manufacturing the same. More specifically, the knots of wood obtained from sawn natural wood are removed and a knot-hole wood forming body similar to natural wood is created at the knot-removed site in a simple and simple manner. It relates to a knot-removable natural wood that can improve durability, water resistance, and marketability and reduce manufacturing costs by forming it firmly in a method and to a method of manufacturing the same.
The knot-removing natural wood according to the present invention includes a knot-removing wood forming body that fills the knot holes formed by removing the knot portion of the wood body made of natural wood; and a separation prevention member fixed to the inner surface of the knot hole to prevent the knot hole wood forming body from coming off.

Description

Knot-removing natural wood and its manufacturing method {KNOT-REMOVED NATURAL WOOD AND ITS MANUFACTURING METHOD}

The present invention relates to knot-removable natural wood and a method of manufacturing the same. More specifically, the present invention relates to a knot-removing natural wood and a method of manufacturing the same. More specifically, the knots of wood obtained from sawn natural wood are removed and a knot-hole wood forming body similar to natural wood is created at the knot-removed site in a simple and simple manner. By firmly forming the knot using this method, it overcomes the decrease in the strength of the knot area, improves the marketability of the product by preventing the knot from coming out over time, and reduces manufacturing costs by preventing loss of the product due to knot removal. It relates to natural wood and its manufacturing method.

In general, natural wood made from domestic and foreign coniferous species such as pine, larch, and cypress is excellent in strength, durability, pattern, and aesthetics, and is widely used as materials for indoor and outdoor finishing materials for construction, furniture, interior design, tools, and musical instruments. .

Natural wood is processed from natural wood, so as the tree grows, knots are created in the areas where the branches extend. The color and strength of the knots are different from other parts, and the aesthetics are also poor, so consumers do not prefer them, so knots are created in the area where the branches extend. Natural wood has the disadvantage of being cheap and having low value as wood.

In addition, the knots in natural wood easily crack, which is a major cause of reduced durability, and because water leaks occur, a large amount of wood is used for cheap fuel or is discarded. In addition, the knot portion has the disadvantage of causing the knot to come off over time, which reduces marketability and produces defective products.

As a way to solve these limitations of natural wood, Republic of Korea Patent Publication No. 10-2002-008700 discloses a 'method of making holes in the knots of natural wood and bonding natural wood to the holes.'

In the natural wood according to the above-mentioned Patent Publication No. 10-2002-008700, as shown in Figure 1, the knot portion of the natural wood (1) is drilled to form a knot hole (2), and the knot hole (2) is formed. ), the molded groove artificial wood (10) is inserted and bonded, and the round natural wood (5) is inserted and bonded into the hole (2) of the molded groove artificial wood (10).

Although the natural wood manufacturing method according to the above-described prior patent publication No. 10-2002-008700 can produce natural wood with knots removed, it has limitations that involve various problems as follows.

First, the natural wood manufacturing method according to Patent Publication No. 10-2002-008700 involves sequentially inserting and adhering two types of devices, such as molded groove artificial wood (10) and round natural wood (5), into the knot hole (2). It has the disadvantage of being complex and increasing manufacturing costs, as two types of instruments must be manufactured and assembled separately.

In addition, the natural wood manufacturing method according to Patent Publication No. 10-2002-008700 involves inserting two types of devices, such as molded groove artificial wood (10) and round natural wood (5), into the holes and then fixing them by gluing. Therefore, when external force is applied locally or when used for a long time, there are problems with poor durability and watertightness, such as easy separation due to limitations in adhesion. Additionally, since adhesives contain chemical ingredients, they are not only unfriendly to the environment, such as causing bad odors, but also have limitations that reduce marketability.

Korean Patent Publication No. 10-2002-008700 ‘Method of making holes in the knots of natural wood and bonding natural wood to the holes.’ Korean Patent Publication No. 10-2009-0020443 ‘Method for waterproofing the bone shaft of cypress tree’ Korean Patent No. 10-2385056 ‘Method for processing the surface of logs with knots, holes or cracks’

The present invention was proposed in light of the above content, and by firmly forming a knot hole wood forming body at the knot removal site in a concise and simple manner, it overcomes the decrease in strength of the knot portion and prevents the knot from coming out over time. The purpose is to provide knot-removing natural wood and its manufacturing method that improves the marketability of products and reduces manufacturing costs by preventing loss of products due to knots falling out.

In order to achieve the above object, the knot-removable natural wood according to the present invention is a knot-removable natural wood, which is a knot-hole wood former that fills the knot hole formed by removing the knot portion of the wood body made of natural wood. ; and a separation prevention member fixed to the inner surface of the knot hole to prevent the knot hole wood forming body from coming off.

The wooden body includes a locking groove formed on the inner surface of the knot hole so that the end of the breakaway prevention member is caught, and the breakaway prevention member is inserted into the knot hole while being elastically deformed and then unfolds to be caught in the locking groove. It can be formed as an elastic bar with elasticity.

In addition, the locking groove may be formed as a ring-shaped groove recessed in a ring shape along the inner circumference of the knot hole, and the elastic bar may be formed in a criss-cross (+) shape.

Preferably, the separation prevention member is formed of an elastic bar having elasticity so as to be fixed to the inner surface of the knot hole, and the elastic bar has a deformation groove in the bar body with a narrow entrance and a structure whose width gradually increases toward the inside. Those with elastic bending parts can be applied.

The elastic rod may have a structure in which the elastic bending portion is formed in the center of a rod body having a rectangular plate shape, and pressing protrusions press-fitted into the inner surface of the knot hole are protruded at both ends of the rod body.

In addition, the separation prevention member may further include an expansion member that expands while being press-fitted into the deformation groove of the elastic bend part.

The elastic bending portion has a connection portion connected between a pair of inclined portions formed to face each other so that the deformation groove is formed as a trapezoid-shaped groove having an opening at the upper portion and a lower end of the inclined portion, and the connecting portion has a fastening hole for pressing. It can be structured.

Preferably, the expansion member is configured to include a fastening member fastened to the pressurizing fastening hole, and a wedge member of an upper and lower narrow structure where the upper part is large and the lower part is small so that the fastening member is inserted and applies a deforming force to the inclined portion. You can.

The knot hole wood forming body includes a core portion hardened by discharging a first composition containing a polymer resin, filler, and fibrous powder into the center of the knot hole; and a surface portion hardened by discharging a second composition containing a polymer resin, filler, fibrous powder, and pigment to the upper and lower portions of the core portion.

In order to achieve the above object, the knot-removing natural wood manufacturing method according to the present invention is a knot-removing natural wood manufacturing method, which involves removing the knot portion of a wooden body made of natural wood to form a knot hole. formation stage; A separation prevention member installation step of press-fitting an end of the separation prevention member into the knot hole formed by the knot hole forming step so that the end of the separation prevention member is caught; A stopper installation step of installing a stopper on one side of the knot hole; A core portion forming step of forming a core portion by discharging and curing a first composition containing a polymer resin, a filler, and fibrous powder in the center of the knot hole in the direction of the knot hole where the stopper is not installed; A stopper separation step of separating the stopper after performing the core portion forming step; And a surface portion forming step of forming a surface portion by discharging and curing a second composition containing a polymer resin, filler, fibrous powder, and pigment to the upper and lower portions of the knot hole where the core portion is formed.

The knot-removing natural wood manufacturing method according to the present invention further includes a locking groove forming step of forming a locking groove on the inner surface of the knot hole before performing the separation prevention member installation step. The separation prevention member installation step can be performed by inserting and installing the separation prevention member into the engaging groove formed by the engaging groove forming step.

In the step of installing the breakaway prevention member, the breakaway prevention member installs an elastic bar in which an elastic bar having a narrow entrance and a deformation groove whose width gradually increases toward the inside is formed on an elastic bar body. process; and a press-fitting process of the expansion member in which the expansion member is press-fitted into the deformation groove of the elastic bend portion and spreads out, so that the pressure protrusion formed at the end of the rod body is press-fitted and fixed to the inner surface of the knot hole.

According to the knot-removable natural wood and its manufacturing method according to the present invention, the knots are removed by injection into the knot-removing area in a simple and simple manner, without requiring processing of multiple types of artificial and natural wood parts or multiple bonding operations as in the prior art. Since the porous wood former can be formed firmly, it overcomes the decrease in the strength of the knot area, improves the marketability of the product by preventing the knot from coming out over time, and reduces manufacturing costs by preventing loss of the product due to knot loss. There is a possible effect.

In addition, according to the knot-removable natural wood and its manufacturing method according to the present invention, a breakaway prevention member is installed inside the knot hole to perform the function of a frame supporting the knot hole wood forming body, thereby ensuring stable fixation strength and durability. There is an effect.

Figure 1 is a diagram for explaining conventional knot-removing natural wood;
Figure 2 is a diagram for explaining the knot-removable natural wood according to the first embodiment of the present invention, and is a perspective view showing the state before and after the knots are removed.
Figure 3 is an exploded perspective view of main parts for explaining the knot-removable natural wood according to the first embodiment of the present invention, showing part A of Figure 2 separated.
Figure 4 is a main cross-sectional view for explaining the knot-removable natural wood according to the first embodiment of the present invention and shows the cross-sectional structure of part A of Figure 2.
Figure 5 is a flowchart for explaining the knot-removing natural wood manufacturing method according to the first embodiment of the present invention.
Figure 6 is an exploded perspective view of main parts for explaining the knot-removable natural wood according to the second embodiment of the present invention, showing part A of Figure 2 separated.
Figure 7 is a main cross-sectional view for explaining the knot-removable natural wood according to the second embodiment of the present invention, showing the cross-sectional structure of part A of Figure 2.
Figure 8 is a flowchart for explaining the knot-removing natural wood manufacturing method according to the second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the attached drawings, and like reference numerals will be assigned to the same components.

Meanwhile, in each drawing, detailed descriptions of the configuration and its operations and effects that can be easily understood by a person with ordinary knowledge in the field from general techniques are simplified or omitted. In addition, since the present invention is characterized by knot-removing natural wood and its manufacturing method, the relevant parts will be shown and explained, and the description of the remaining parts will be simplified or omitted.

Figure 2 is a diagram for explaining the knot-removable natural wood according to the first embodiment of the present invention, and is a perspective view showing the state before and after the knots are removed. Figure 3 is an exploded perspective view of main parts for explaining the knot-removable natural wood according to the first embodiment of the present invention, showing part A of Figure 2 separated. Figure 4 is a main cross-sectional view for explaining the knot-removable natural wood according to the first embodiment of the present invention and shows the cross-sectional structure of part A of Figure 2.

Referring to Figures 2 to 5, the knot-removing natural wood according to the first embodiment of the present invention is capable of firmly forming a knot hole wood forming body at the knot removal site in a concise and simple manner. A knot hole wood forming body (2) filled in the knot hole (13) formed by removing the knot portion (12) of the lumber body (1), and a knot formed so that the knot hole wood forming body (2) does not come off. It is provided with a separation prevention member (3) fixed to the inner surface of the hole (13).

The knot hole 13 is formed with a locking groove 14 recessed on the inner surface so that the end of the separation prevention member 3 is caught.

The locking groove 14 is formed by cutting the central inner surface of the knot hole 13 using a manual cutting tool, an electric cutting tool, etc., and can be formed only at the part where the end of the separation prevention member 3 is inserted, but in this embodiment In the example, the inner circumference of the knot hole 13 is cut to form a ring-shaped groove.

On the other hand, the separation prevention member 3 is a component that supports the knot hole wood forming body 2, and has a special shape or structure if it can be inserted into the locking groove 14 while inserted through the knot hole 13. It can be configured without limitation, but in this embodiment, it is composed of an elastic rod 31.

The elastic bar 31 is a member that has elasticity so that it is inserted into the knot hole in a bent state and caught in the locking groove 14 while unfolding. It is larger than the inner diameter of the knot hole 13 so as to be closer to the inner diameter of the locking groove 14. It is formed in a long length. In addition, the elastic bar 31 may be formed in a straight shape, but in this embodiment, it is shown in a crisscross (+) shape.

There is no particular limitation on the material, structure, etc., as long as the knot hole wood forming body 2 can be configured to form a flat surface with the surface of the adjacent wood body 1 in a state filled inside the knot hole 13, but in this embodiment, As shown in 4, the core portion 22 is filled in the center so as to have spaces at the top and bottom of the knot hole 13, and the surface portion 24 is filled with the space provided at the top and bottom of the core portion 22. ) is provided.

Since the core portion 22, unlike the surface portion 24, is a part filled inside, it is formed by injecting a first composition containing no pigment for color formation into the center of the knot hole and then hardening it.

The first composition is formulated in a gel form to include polymer resin and filler, but also includes fibrous powder to increase binding strength.

The polymer resin is a thermoplastic resin, for example, selected from the group consisting of polyethylene, polypropylene, polybutylene, polymethyl pentene, ethylene vinyl acetate, ethylene butylacrylate, ethylene ethyl acrylate, and combinations or copolymers of two or more of these. It may include a polyolefin, acrylonitrile-butadiene-styrene copolymer (ABS), polyvinyl chloride (PVC), or a combination thereof.

The filler may include one particulate, spherical and/or plate-shaped filler selected from the group consisting of vermiculite, calcium carbonate, silica, talc, mica, aluminum hydroxide, aluminum oxide, barium sulfate and combinations of two or more thereof, and fibrous filler. It may also include . Here, the fibrous filler may be composed of one selected from the group consisting of carbon fiber, glass fiber, cellulose fiber, engineering plastic fiber, ceramic fiber, and a combination of two or more of these.

Fibrous powder is added to reinforce the durability and mechanical rigidity of the core portion 22, and can be applied by drying and pulverizing wood, waste wood, etc., and powdering it to a particle size of about 30 to 120 mesh.

Here, the content of fibrous powder in the core portion 22 is preferably 30 to 70% by weight. The reason is that if the content of fibrous powder in the core portion 22 is less than 30% by weight, the durability and mechanical properties of the core portion 22 may be reduced, and if it is more than 70% by weight, fillers and other particulate materials contained in the core portion may be reduced. dispersibility may decrease.

Meanwhile, the first composition further contains one additive selected from the group consisting of an impact modifier, a lubricant, a stabilizer, a plasticizer, a foaming agent, and a combination of two or more of these.

The impact modifier is used to improve impact resistance by providing a certain amount of elasticity to the core portion 22, and may be a thermoplastic resin, thermoplastic elastomer, or rubber resin.

Lubricants serve to reduce friction between polymer chains when processing polymer resins (internal lubricant) or to reduce friction between polymer resins and processing machines (external lubricants). In particular, if a lubricant is not added when processing polyvinyl chloride, local friction may occur, causing the temperature of the molded body to rise above the heat deformation temperature of the resin, causing deformation such as pigmentation, and increasing friction between the resin and the processing machine. As a result, not only does thermal deformation of the resin occur due to resin adhesion, but the maintainability of the processing machine can be significantly reduced.

The internal lubricant may be, for example, calcium stearate, barium stearate, magnesium stearate, fatty acid alcohol, etc., and the external lubricant may be, for example, polyethylene wax, polyethylene oxide wax, paraffin wax, paraffin oil, amide wax. , metal salts of fatty acids, zinc stearate, lead stearate, etc.

The plasticizer penetrates between polymer resins and other polymers constituting the resin components, weakens the forces between polymers, and improves the mobility of polymer chains. Additionally, flexibility can be provided by lowering the glass transition temperature of the polymer. In particular, in polyvinyl chloride, the flexibility can be easily adjusted simply by adjusting the amount of plasticizer added.

For example, the first composition contains 20 to 70% by weight of polymer resin, 30 to 70% by weight of fibrous powder, 1 to 10% by weight of impact modifier, 1 to 10% by weight of filler, and 0.1 to 5% by weight of lubricant (which also serves as a heat stabilizer). %, the plasticizer (which also acts as a heat stabilizer), and a foaming agent can be configured to include in the range of 0.1 to 5% by weight.

Meanwhile, the surface part 24 is a part filled with the upper and lower parts of the core part 22 and exposed to the outside, and contains the above-mentioned polymer resin, filler, and fibrous powder, and has the same and similar color as the surface of the adjacent wooden body. It is formed by a second composition further comprising a pigment that makes it possible. Here, since the polymer resin, filler, and fibrous powder are the same as or similar to those included in the first composition described above, detailed descriptions are omitted.

The pigment may be carbon black, iron oxide (Fe2O3), or a combination thereof. Preferably, various colors can be imparted to the surface portion 24 by mixing carbon black and iron oxide in a predetermined ratio. there is

For example, the second composition contains 70 to 95% by weight of polymer resin, 1 to 10% by weight of filler, 0.1 to 5% by weight of plasticizer (also serves as a heat stabilizer), 0.1 to 5% by weight of lubricant (also serves as a heat stabilizer), And the pigment may be 0.1 to 5% by weight, but is not limited thereto.

In addition, the thickness of the above-described core portion 22 and the surface portion 22 is not particularly limited, but in this embodiment, the core portion is formed to have a thickness of 50 to 80% of the total height (depth) of the knot hole, The upper and lower surface portions may each be formed to have a thickness of 10 to 25%. For example, in this embodiment, when the total height of the knot hole is 30 mm, the core portion is formed to be 20 mm thick and the upper and lower surface portions are each formed to be 5 mm thick.

Hereinafter, a method for producing knot-removing natural wood according to the first embodiment of the present invention will be briefly described.

The accompanying drawings, Figure 5, are flowcharts for explaining the knot-removing natural wood manufacturing method according to the first embodiment of the present invention.

The method for producing knot-removable natural wood according to the first embodiment of the present invention is a method for producing knot-removable natural wood, as shown in Figures 2 to 5. Knot hole forming step (s1), catching groove forming step (s2), separation prevention member installation step (s3), stopper installation step (s4), core part forming step (s5), stopper separation step (s6), surface part formation Step (s7) and closing step (s8) are implemented sequentially.

The knot hole forming step (s1) is a step of forming the knot hole (13) by removing the knot portion of the wooden body (1) made of natural wood in the form of a board. The knot hole is formed by cutting the knot using an electric drill. form

The locking groove forming step (s2) is a step of forming a locking groove on the inner surface of the knot hole 13 formed in the knot hole forming step (s2) before performing the separation prevention member installation step (s3), and is an electric drill having a bent drill shaft. It is formed by cutting it to a depth of approximately 5 mm using a drill, etc.

The separation prevention member installation step (s3) is a step of press-fitting and installing the end of the separation prevention member (3) so that it is caught in the knot hole (13) formed in the knot hole forming step (s1). Pressure is applied to the center portion of the separation prevention member. When pressing force is applied using a tool (not shown), the bar buoy is elastically deformed into a bent shape, so when the pressing force is released while the end is inserted into the locking groove (14), it returns to its original state and installation is completed. do. Here, the separation prevention member 3 can be prepared in advance according to the production quantity of knot-removable natural wood and then used repeatedly.

And when the separation prevention member (3) is installed inside the knot hole (13) by the above-mentioned separation prevention member installation step (s3), the function of the frame to support the knot hole wood forming body (2) formed by the process described later This ensures stable fixation strength and durability.

The stopper installation step (s4) is a step of installing a stopper that functions as a mold to prevent the first composition introduced in the core forming step (s5) from flowing down. The stopper is formed with a cross-sectional structure of approximately "┌┐" shape ( (not shown) is installed by press-fitting it into one side of the knot hole. Here, the stopper (not shown) is formed to have a diameter corresponding to the knot hole and has a height of about 5 mm when inserted into the knot hole.

The core portion forming step (s5) is a step of forming the core portion 22 at the center of the knot hole 13, by applying the previously prepared first composition as described above to the other side of the knot hole where the stopper is not installed. The core portion 22 is formed by discharging it into the center of the knot hole using an injection gun or automated injection equipment and then hardening it. At this time, the first composition is injected through the opening of the knot hole opposite the direction of installation of the stopper, and is filled in the opposite direction from the surface of the stopper, but only to a position 5 mm lower than the surface of the wooden body (1), so that the surface portion is formed in the step described later. A space is provided to be filled with the second composition for the formation of (24).

Here, curing of the first composition can be carried out by natural drying, but in order to shorten the manufacturing time and mass production, it is carried out by a heat drying method in which it is placed in a heat drying room, or by a heat pressing method using a separate heat press. It is desirable.

The stopper separation step (s6) is a step of separating the stopper after performing the core portion forming step (s5). There is no particular limitation on the timing of separation if the first composition does not flow, but the first composition hardens to some extent to form the core portion (22). It is desirable to implement it while forming.

The surface portion forming step (s7) is a step of forming the surface portion 24 on the upper and lower portions of the core portion 22. The second composition composed as described above is applied to the upper and lower portions of the knot hole where the core portion 22 is formed. The surface portion 24 is formed by discharging it to the lower part and then hardening it.

In addition, in the surface forming step (s7), the second composition is added to the knot hole 13 corresponding to the upper part of the core part 22 and cured, and then the second composition is added to the knot hole corresponding to the lower part of the core part 22. It is preferable to carry out the process sequentially by adding the composition and allowing it to harden.

The finishing step (s8) is a step of drying the surface of the surface portion 24 formed in the surface portion forming step (s7) to resemble the surface of the adjacent wooden body (1) or removing foreign substances.

Hereinafter, another embodiment according to the present invention will be described, but detailed description of components similar to those shown in the above-described first embodiment will be omitted and description will focus on components having differences. In addition, in other embodiments below, any structure that can be adopted among the components shown in the first embodiment or the components shown in different embodiments may be selectively applied, and detailed descriptions or illustrations in the drawings are omitted.

Figure 6 is an exploded perspective view of main parts for explaining the knot-removable natural wood according to the second embodiment of the present invention, showing part A of Figure 2 separated. Figure 7 is a main cross-sectional view for explaining the knot-removable natural wood according to the second embodiment of the present invention, showing the cross-sectional structure of part A of Figure 2. Figure 8 is a flowchart for explaining the knot-removing natural wood manufacturing method according to the second embodiment of the present invention.

Referring to Figures 6 to 8, the knot-removable natural wood and its manufacturing method according to the second embodiment of the present invention are knots formed by removing the knot portion 12 of the wooden body 1 made of natural wood. A knothole wood forming body (2) filled in the hole (13) and having a core portion (22) formed by a first composition and a surface portion (24) formed by a second composition as in the first embodiment described above. And, the knot hole wood forming body (2) is provided with a breakaway prevention member (3') fixed to the inner surface of the knot hole (13) so that it does not break away, and the breakaway prevention member (3') is bent and unfolded. It is provided with an elastic rod 32 having elasticity so as to be fixed to the inner surface of the knot hole 13, and an expansion member 33 that expands the elastic rod 32.

The elastic bar 32 has a narrow entrance in the bar body 321 formed to a length similar to the inner diameter of the knot hole 13 so as to be forcefully fitted into the knot hole 13, and has a deformation groove of a structure whose width gradually increases toward the inside. An elastically bent portion 322 having 323 is formed.

To be more specific, the elastic bar 32 has the above-described elastic bending portion 322 formed in the center of a bar body 321 having a rectangular plate shape with a length longer than the width, and the elastic bar 322 is formed on both sides of the bar body 321. A pressing protrusion 324 is formed at the end in a protruding structure so as to be press-fitted into the inner surface of the knot hole 13.

The elastic bending portion 322 is a pair of inclined portions 322a formed to face each other to form a trapezoid-shaped deformation groove 323 with an opening at the top, and a connection portion 322b connected between the lower end of the inclined portion 322a. ), but a fastening hole 325 for pressurization is drilled in the connection portion 322b.

The expansion member 33 is a component that spreads the inclined portion by being press-fitted into the deformation groove 323 of the elastic bending portion 322. Pressing protrusions 324 formed at both ends by unfolding the elastic bending portion are press-fitted into the inner surface of the knot hole 13. If possible, it can be configured in various ways without any particular restrictions on shape or structure.

Preferably, the expansion member 33 is lowered when the fastening member 331 is fastened to the fastening hole 325 for pressure, and applies a deforming force to spread the inclined portion 322a. It is composed of a wedge member 332 with a large upper part and a smaller lower part.

The wedge member 332 is a trapezoidal member with a narrow lower part and a wide upper part, and has an insertion hole 332b drilled in the vertical direction into which the fastening member 331 is inserted. Here, the insertion hole 332b has an inner diameter larger than the outer diameter of the fastening member 331, so that the wedge member 332 does not rotate together when the fastening member 331 is fastened.

In addition, the fastening member 331 is comprised of a screw, and it is preferable that a screw thread is formed in the lower portion so that the wedge member 332 does not rotate together when the fastening member 331 is fastened.

Hereinafter, a method for producing knot-removable natural wood according to a second embodiment of the present invention will be briefly described.

Referring to Figure 8, the knot-removable natural wood manufacturing method according to the second embodiment of the present invention is similar to the manufacturing method according to the first embodiment described above, comprising a knot hole forming step (s1), a separation prevention member installation step ( s3), the stopper installation step (s4), the core portion forming step (s5), the stopper separation step (s6), the surface portion forming step (s7), and the finishing step (s8) are performed sequentially, but are not caught in the first embodiment described above. The difference is that the groove forming step (s2) is omitted, and the remaining steps (s1, s4, s5, s6, s7, s8, s9) are similar, so detailed descriptions are omitted and the differentiated separation prevention member installation step (s3) ) is explained in detail only.

The separation prevention member installation step (s3) includes an elastic member installation process (s31) of installing the elastic bar 32 in the knot hole 13, and an expansion process of deforming the elastic bar 32 using the expansion member 33. A member press-in process (s32) is provided.

Referring to FIGS. 6 and 7, the above-described elastic member installation process (s31) is a process of installing the elastic bar 32 to the extent that it is pressed into the knot hole 13 and the pressing protrusion 324 is in close contact with the inner surface of the knot hole. there is.

The elastic member installation process (s31) is provisionally assembled by lightly inserting the wedge member (332) into the deformation groove (323) of the elastic bar (32) in order to effectively perform the expansion member press-fitting process (s32), and the wedge member (332) is ) It is preferable to install the fastening member 331 in the insertion hole 332b in a temporarily assembled state.

The expansion member press-fitting process (s32) is performed by press-fitting the expansion member 33 downward into the deformation groove 323 of the elastic bending portion 322 of the elastic bar 32 and spreading it to form a pressurized protrusion ( 324) is a process to press-fit and fix it on the inner surface of the knot hole.

To be more specific, the expansion member press-fitting process (s32) performs a fastening operation on the fastening member 331 provisionally assembled by the elastic member installation process (s31) using an electric driver, so that the fastening member 331 lowers and simultaneously forms a wedge. As the member 332 moves downward, the deformation groove 323 opens, so that the pressing protrusions 324 formed on both ends of the elastic bar 32 are pressed into the inner surface of the knot hole 13 and are fixed.

In addition, the expansion member press-fitting process (s32) involves a fixing jig that supports the connection portion 322b of the elastic bending portion 322 at the bottom to prevent the elastic bar 32 from being separated downward during the fastening operation by an electric driver. (not shown) can also be installed.

Terms such as “include,” “comprise,” or “have,” as used above, unless specifically stated to the contrary, mean that the corresponding component may be present, and do not exclude other components. It should be interpreted that it may further include other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

The configuration and operation of the knot-removable natural wood and its manufacturing method according to an embodiment of the present invention described above have been described, but this is illustrative and those skilled in the art should not depart from the technical idea of the present invention. It will be understood that it is possible to substitute and modify some of the above-described embodiments within the scope.

Therefore, the scope of protection of the present invention should be understood to extend to the invention described in the claims and equivalents thereof.

1: Wooden body 12: Knot area
13: Knot hole 2: Knot hole wood former
22: Core portion 24: Surface portion
3,3': separation prevention member 31,32; elastic rod
33: Expansion member 331: Fastening member
332: Wedge member s1: Knot hole formation step
s2: Locking groove formation step s3: Separation prevention member installation step
s4: Stopper installation step s5: Core formation step
s6: Stopper separation step s7: Surface formation step
s8: Closing stage

Claims (10)

In knot-removable natural wood,
A knot hole wood forming body that fills the knot holes formed by removing the knots of a wood body made of natural wood; And a separation prevention member fixed to the inner surface of the knot hole to prevent the knot hole wood forming body from coming off,
The separation prevention member is formed of an elastic rod having elasticity to be fixed to the inner surface of the knot hole, and the elastic rod has an elastic bending portion in the rod body having a deformation groove with a narrow entrance and a structure whose width gradually increases toward the inside. The elastic bent portion is formed in the center of a rod body having a rectangular plate shape, and a pressure protrusion press-fitted into the inner surface of the knot hole is protruded at both ends of the rod body,
Knot-removable natural wood comprising an expansion member that expands while being press-fitted into the deformation groove of the elastic bent portion.
delete delete delete delete According to paragraph 1,
The elastic bending portion has a connecting portion connected between a pair of inclined portions formed to face each other so that the deformation groove is formed as a trapezoid-shaped groove with an opening at the upper portion, and a lower end of the inclined portion, wherein the connecting portion is perforated with a fastening hole for pressing. It is made up of a structure,
The expansion member includes a fastening member fastened to the pressurizing fastening hole, and a wedge member with a large upper part and a smaller upper and lower narrow structure so that the fastening member is inserted and applies a deforming force to the inclined portion. Removable natural wood.
According to paragraph 1,
The knot hole wood forming body,
A core portion hardened by discharging a first composition containing a polymer resin, filler, and fibrous powder into the center of the knot hole; and
A surface portion cured by discharging a second composition containing a polymer resin, filler, fibrous powder, and pigment to the upper and lower portions of the core portion. A knot-removable natural wood comprising a.
In the knot-removing natural wood manufacturing method,
A knot hole forming step of forming a knot hole by removing the knot portion of a wooden body made of natural wood;
A separation prevention member installation step of press-fitting an end of the separation prevention member of any one of claims 1, 6, and 7 into the knot hole formed by the knot hole forming step so that it is caught;
A stopper installation step of installing a stopper on one side of the knot hole;
A core portion forming step of forming a core portion by discharging and curing a first composition containing a polymer resin, a filler, and fibrous powder in the center of the knot hole in the direction of the knot hole where the stopper is not installed;
A stopper separation step of separating the stopper after performing the core portion forming step; and
A surface portion forming step of forming a surface portion by discharging and curing a second composition containing a polymer resin, filler, fibrous powder, and pigment to the upper and lower portions of the knot hole where the core portion is formed. Method of manufacturing natural wood.
According to clause 8,
It further includes a locking groove forming step of forming a locking groove on the inner surface of the knot hole before performing the separation prevention member installation step.
The separation prevention member installation step is a method of producing knot-removing natural wood, characterized in that the separation prevention member is inserted and installed into the engaging groove formed by the engaging groove forming step.
According to clause 8,
The separation prevention member installation step is,
The separation prevention member includes an elastic member installation process of installing an elastic rod having an elastic bending portion having a narrow entrance and a deformation groove whose width gradually increases toward the inside to an elastic rod body; and
A knot-removing natural product comprising a process of press-fitting the expansion member into the deformation groove of the elastic bend portion and spreading it so that the pressure protrusion formed at the end of the rod body is press-fitted and fixed to the inner surface of the knot hole. Wood manufacturing method.

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