JP2009006498A - Grain emphasis method of woody material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the grain emphasis method of woody material of inexpensive manufacturing cost, for impregnating a pigment even into a thick woody material. <P>SOLUTION: The grain emphasis method includes: a decompression process 100 for putting the woody material with bordered pits not completely closed, such as radiata pine, into a pressure vessel and for decompressing it; an injection process 200 for filling an aqueous solution with the pigment consisting of particles capable of passing through the bordered pits of the woody material added thereto into the decompressed pressure vessel, pressurizing the pressure vessel, and injecting the pigment into the woody material; a drying process 300 for drying the woody material with the pigment injected thereinto; and a working process 400 for cutting off the front surface or the front and rear surfaces of the woody material after drying. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a grain emphasizing method for a wood material in which the grain of the wood material is emphasized by a pigment to give a high-quality wood texture.

As one of the methods of emphasizing the grain of wood materials used for interior materials such as flooring materials and door sliding doors in houses, etc., to give high-quality wood texture, synthetic resin is injected and impregnated into wood materials and cured to make wood materials A method such as WPC (Wood Plastic Combination) for strengthening is known (for example, see Patent Documents 1 to 5).
JP-A-2-204003 Japanese Patent Publication No. 6-51283 Japanese Patent Publication No. 6-325 Japanese Patent Publication No. 6-39082 JP-A-1-195002

The invention described in Patent Document 1 relates to a method for producing a colored synthetic resin-impregnated cured product, in which a wooden material is mixed with a dye and a pigment that are not soluble in the synthetic resin and impregnated with the colored synthetic resin at a time. It is.
The invention described in Patent Document 2 relates to a method for producing colored wood in WPC, and is a method in which a color difference is made to stand out by repeatedly applying a colorant together with a synthetic resin.
Furthermore, the invention described in Patent Document 3 relates to a method for producing a colored wood, which is impregnated with a reactive color former as a pretreatment and colored, and then impregnated with a dye to perform WPC treatment. This is a method of darkening the vascular part.
In addition, the invention described in Patent Document 4 relates to a method for producing colored wood. Like the invention described in Patent Document 2, the color difference is highlighted by repeatedly applying a colorant together with a synthetic resin. This is how to do it.
The invention described in Patent Document 5 relates to a method for producing a reinforced decorative board with emphasis on wood grain, and is a method of adding a pigment capable of emphasizing wood grain into the impregnating resin in the WPC conversion of hardwood.

However, as in the inventions described in Patent Documents 1 to 5, in the coloring process in WPC, the types that can be colored in the synthetic resin are determined by the number of tanks that store the synthetic resin. There is a problem that the colors are mixed if the color of the previous resin adhering to the pot is not sufficiently washed and removed.
Therefore, a pressure vessel for each color is required and the cost is high, so it is not practical and is not suitable for mass production of various products.
Moreover, in the coloring process in WPC, as shown in Patent Document 1 and Patent Document 5, the pressure at the time of pressurization requires 30 kgf / cm ² , and the equipment that can withstand that is very expensive. turn into.

  In addition, as in the inventions described in Patent Documents 1 to 4, those using a dye that generates a color by utilizing a chemical bond as a colorant may dye early and late wood materials at the same time. However, there is a problem that it is leached with water as compared with a pigment, is inferior in fading, and causes color deterioration (whitening) due to sunburn. In addition, the cost of the dye is about three times that of the pigment, which increases the cost. Furthermore, there is also a problem that the wood texture is lost because the entire material is colored.

On the other hand, as in the invention described in Patent Document 5, using a pigment that is an aggregate of colored particles as a colorant can compensate for the disadvantages of dyes. The thickness is 15 μm or less, preferably 10 μm or less for the purpose of entering into a 1 mm thick ridge veneer, so a 1 mm thick veneer may be impregnated, but for example, about 12 to 36 mm as a wood material When a solid material having a thickness of is used, the solid material cannot be impregnated with a pigment. Therefore, the applied wood material is limited to a small thickness, and cannot be applied to a wood material having a sufficient thickness such as a flooring material or a door sliding door.
In addition, although the thing using a pigment is described also in patent document 4, it is only a base material coloring to the wood surface.

  Accordingly, an object of the present invention is to provide a wood grain emphasizing method that can impregnate a thick wood material with a pigment and is inexpensive in production cost.

  In order to achieve the above object, the wood material grain emphasizing method according to claim 1 of the present invention is a pressure reducing step (100) in which a wooden material whose edged wall holes are not completely closed is put in a pressure vessel and decompressed. ), And filling the reduced pressure vessel with an aqueous solution to which a pigment made of particles that can pass through the wall of the wooden material is added, and pressurizing the pressure vessel to inject the pigment into the wooden material A step (200), a drying step (300) for drying the wood material into which the pigment has been injected, and a processing step (400) for scraping off the surface or front and back surfaces of the wood material after the drying. And

  The wood grain emphasizing method of the wood material according to claim 2 is characterized in that the particle of the pigment is 500 nm or less.

  Furthermore, the grain emphasis method of the woody material according to claim 3 further includes a base coloring step (500) for coloring the surface or front and back surfaces of the woody material processed by the processing step (400). It is characterized by.

  Moreover, the grain emphasis method of the woody material according to claim 4 includes a framed wall hole opening step (50) for forcibly opening the framed wall hole of the wood material in which the framed wall hole such as cedar is closed. A pressure reducing step (100) in which the wooden material with the perforated wall hole opened is put into a pressure vessel and decompressed, and the pressure vessel filled with an aqueous solution to which a pigment composed of particles of 500 nm or less is added is pressure An injection step (200) for pressurizing a container to inject the pigment into the wood material, a drying step (300) for drying the wood material into which the pigment has been injected, and a surface or surface of the wood material after the drying And a processing step (400) for scraping the back surface.

  The wood material grain emphasizing method according to claim 5 is characterized in that the wood material is a solid material or a laminated material.

  Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and the best mode for carrying out the invention described later.

  According to the wood grain emphasizing method of the wood material of the present invention, the size of the pigment particles used as the colorant in the wood material in which the edge wall hole is not completely closed is focused. For example, a material with a thickness of 500 nm or less was used so that it can pass through the wall hole. Through the decompression process and the injection process, the pigment is a wooden material, even if it is a solid or laminated material with a large thickness. As a result, only the late wood material is colored. Moreover, a desired color can be made to appear by giving the process process which scrapes off the surface or front and back of a wooden material after drying.

  Further, according to the grain emphasis method of the wood material of the present invention, the base material coloring step for coloring the early material of the wood material is provided next to the processing step, and the pouring step and the base material coloring step are separated into the final steps. Even when the finish is set to two colors, the installation of the pressure vessel (pot) can be done with one unit corresponding to one color. That is, the injection process, which is laborious and costly, can be completed only by impregnation with one color of each pressure vessel (kettle), and the desired color tone can be obtained by the base coloration process.

  Further, according to the wood grain emphasis method of the wood material of the present invention, even a thick wood material is colored up to the center portion. Therefore, even when the surface is damaged, the paint film is removed and the base material is colored again to make the wood grain stand out. It can be made into a woody material with a texture.

  According to the grain emphasis method of the woody material of the present invention, a woody material having a closed walled hole such as a cedar is focused on as a pretreatment, for example, a microwave heating method, laser insizing, etc. Since the edge wall holes are forcibly opened by the processing method by the edge wall hole opening process such as the method, steam heat treatment method, enzyme treatment method, supercritical carbon dioxide treatment method, compression treatment method, etc. Through the decompression step and the injection step, it is possible to reliably impregnate the interior of the wood material and color only the late material.

  Thus, according to the wood grain emphasizing method of the wood material of the present invention, even if it is a wood material in which the edge wall hole is not closed or a wood material in which the edge wall hole is closed, the wood grain You can make it stand out and have a woody finish.

  A wood grain emphasis method according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a manufacturing process by a grain emphasis method of a wood material.

  As shown in FIG. 1, the grain emphasis method of the wood material according to the embodiment of the present invention includes a decompression step 100, an injection step 200, a first drying step 300, a processing step 400, a substrate coloring step 500, and a second drying. This is performed by the process 600, the painting process 700, and the third drying process 800, whereby the grain of the woody material is emphasized.

  As the wood material, a wood material in which the peripheral wall hole is not completely closed, for example, Radiata pine was prepared. Radiata pine is a solid material having a moisture content of about 10% when air-dried, and is used for interior materials such as flooring.

  In the decompression step 100, the wood material is placed in a pressure vessel (pot) and exhausted for 30 minutes or more with a capacity as close to vacuum as possible.

  Next, in the injection step 200, the pressure vessel (kettle) having a reduced pressure is filled with an injection chemical solution made of an aqueous solution to which a pigment made of particles that can pass through the perforated wall hole of the wooden material is added. Is pressurized to 0.5 to 2.0 MPa for 30 minutes or more using a pressurizing pump, and the chemical solution is injected and impregnated into the water quality material using the difference from the atmospheric pressure. Note that the pressure is set to 0.5 to 2.0 MPa because if the pressure is less than 0.5 MPa, the grain is not sufficiently emphasized, and if it exceeds 2.0 MPa, a pressure vessel (pot) that can withstand it is used. This is because it is necessary to prepare the cost.

  For the injectable solution, 3% of the pigment as a colorant is added to an aqueous solution containing 10% of isopropyl alcohol. Here, only a pigment is used as a colorant, and no dye is used. The pigment used has such a size that the particles can pass through the peripheral wall pores of Radiata pine. Specifically, an arbitrary color was prepared from three colors of red, black and yellow with a pigment of 500 nm or less. In the end, for example, when finishing to a cheek color and a nut color, it is desirable to prepare a color with an intermediate color. In this example, isopropyl alcohol is used because it is inexpensive, but ethanol, methanol, propanol or the like may be used as long as it has high volatility and does not remain after drying.

By this injection step 200, the pigment passes through the peripheral wall hole of the radialata pine and is impregnated from the front to the back even if it is a solid material having a plate thickness of about 12.5 mm, and only the late material is colored, The early wood is hardly colored.
Here, the pigment is colored only in the late material, but the diameter of the temporary conduit is fine in the late material, but the early material is thick, so the late material in which the speed of the aqueous solution passing through the pipe is difficult to pass is slower. Particles tend to stay, but in the early wood, the speed of the aqueous solution that passes through the tube is high, so that the pigment particles are not swept away and flowed. In addition, the pigment in the aqueous solution penetrates into the wood material for both late and early wood. However, in the early wood where the wall film of the cell wall is thin, the pigment is not easily filtered into the mesh of the cell wall when the pigment passes through the temporary conduit. (It is difficult to remain) It passes and is hard to be colored. Even if the particles are filtered, the distance between the pigment particles is long, so that it is difficult to develop a color. On the other hand, in the evening material having a thick wall film on the cell wall, the pigment is filtered into the mesh of the cell wall (remaining) when passing through the temporary conduit, and is colored better than the early material. This is because a phenomenon similar to that in which the pigment is applied to the “sieve” called the cell wall occurs in the late and early materials.

  Next, in the drying step 300, after the wood material is taken out from the pressure vessel (pot), the raw material is dried so as to be dried.

Next, in the processing step 400, the front and back surfaces (or only the front surface) of the dried wood material are scraped off using, for example, a molder (not shown).
At this time, it is preferable that the surface side is scraped by 0.5 mm or more in order to obtain a desired color tone. On the other hand, the back side may be scraped to such an extent that warpage and twisting can be removed.

Next, in the substrate coloring process 500, the surface or front and back surfaces of the wood material subjected to the processing process are colored using, for example, a colored sponge roll (not shown). As coloring, for example, it can be applied separately in teak color and nut color.
According to this, since the early wood is well colored, it is possible to finally make the grain stand out compared to the conventional one. In addition, color unevenness due to injection can be reduced.

  Next, in the second drying step 600, the wood material is passed through a dryer (not shown) to dry the whole.

  Next, in the painting process 700, the front and back surfaces of the wood material are painted to form a protective film.

  In the third drying process 800, a wood material with emphasized grain is produced by performing a process of curing the paint painted in the painting process 700.

  According to such a manufacturing method, in Radiata pine, which is a wooden material whose edge wall holes are not completely closed, pay attention to the edge wall holes and determine the size of the pigment particles used as the colorant. Since a pigment of 500 nm or less was used so that the size could pass through the edge wall hole, even if the wood material is a solid material having a plate thickness of 12.5 mm, for example, through the decompression step 100 and the injection step 200, the pigment is used. The interior is impregnated, so that only the wood material evening material is colored. In other words, the pigment particle size is larger than the size that can pass through the peripheral wall hole, so even the late material could not be colored, but attention is paid to the development of pigment dispersion technology and the peripheral wall hole. As a result, the pigment can be surely passed through the perforated wall hole, and only the late material can be colored. In addition, in order to color more vividly and surely, it is preferable that the size of the pigment particles is further set to 150 nm or less.

  Moreover, according to this manufacturing method, even if it is a case where final finishing is set to two colors by making the injection | pouring process 200 and the base | substrate coloring process 500 into a separate process, installation of a pressure vessel (pot) is one color. It can be done with one unit corresponding to. In other words, the injection process 200, which is laborious and costly, can be completed only by impregnation with one pressure vessel (kettle).

In addition, when using a dye instead of a pigment as a colorant, both the late material and the early material are colored. Therefore, as described above, the injection step 200 and the base coloration step 500 can be performed in separate steps. Therefore, it is necessary to install a pressure vessel for each color, and the initial investment becomes enormous. In addition, when using a dye, there are disadvantages such as fading, leaching with water, and high cost.
Traditionally, Radiata pine coloring is uneven when sucked directly onto woody materials, so it can be applied repeatedly by reducing the concentration of the colorant and mixing the color toner into the paint without coloring the substrate. However, as described above, if only the late wood is colored in the pouring step 200, the finish can be made with a distinctive wood texture. Moreover, the color unevenness at the time of impregnation can be relieved by the base coloring process 500 performed later.

  In addition, according to this manufacturing method, even a thick woody material is colored to the center part, so even if the surface is damaged, the paint film is removed and the substrate is colored again to make the wood grain stand out similarly and the woody material with a wood texture Can be.

In this embodiment, as the wood material, a wood material in which the peripheral wall hole is not completely closed, for example, Radiata pine is prepared and used as a solid material as a flooring material. However, a door having a thickness of 37 mm is used. Even a solid material used as a sliding door having a thickness of 31 mm can be impregnated with a pigment to the inside.
Moreover, after injecting and impregnating a solid material, it can also be bonded and used as a laminated material.
Furthermore, although Radiata pine was used as a wooden material in which the edge wall hole is not completely closed, it is not particularly limited as long as it is a wood material in which other edge wall holes are not closed.

Further, in the present embodiment, the wooden material whose closed wall hole is not closed is targeted, but the wooden material whose closed wall hole is closed such as cedar can also be targeted.
That is, as shown by the dotted line in FIG. 1, for a wood material such as cedar where the edge wall hole is closed, the edge wall hole opening step 50 for forcibly opening the edge wall hole is performed as a pretreatment. . The processing performed in the edge wall hole opening step 50 includes, for example, a microwave heating method for irradiating microwaves to open the edge wall holes, a laser insizing method for irradiating a laser, and steam heating for applying steam. There is a processing method. In addition, the peripheral wall hole can be opened by an enzyme treatment method, a supercritical carbon dioxide treatment method, a compression treatment method, or the like.

  As described above, the wood material subjected to the marginal wall hole opening step 50 is then subjected to the decompression step 100, the injection step 200, the first drying step 300, the processing step 400, and the base material coloring. The process 500, the second drying process 600, the painting process 700, and the third drying process 800 are performed, and the grain of the wood material is emphasized.

It is a figure which shows the manufacturing process of the grain enhancement method of the wood material which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 50 Frame wall opening process 100 Depressurization process 200 Injection process 300 Drying process 400 Processing process 500 Base coloring process 600 Drying process 700 Coating process 800 Drying process

Claims (5)

A depressurization step of depressurizing a wooden material in which the peripheral wall hole is not completely closed into a pressure vessel;
An injection step of filling the reduced pressure vessel with an aqueous solution to which a pigment made of particles capable of passing through the edge wall hole of the wood material is added and pressurizing the pressure vessel to inject the pigment into the wood material;
A drying step of drying the wood material into which the pigment has been injected;
And a processing step of scraping off the front surface or the front and back surfaces of the wooden material after the drying.   The wood grain emphasizing method according to claim 1, wherein the pigment particles are 500 nm or less.   The wood material grain emphasizing method according to claim 1 or 2, further comprising a base material coloring step of coloring the surface or front and back surfaces of the wood material processed by the processing step. A step of opening a framed wall hole for forcibly opening the framed wall hole of a wooden material such as a cedar with a closed wall hole;
A depressurization step of depressurizing the wooden material in which the marginal wall hole is opened into a pressure vessel;
An injection step of filling the reduced pressure vessel with an aqueous solution to which a pigment composed of particles of 500 nm or less is added and pressurizing the pressure vessel to inject the pigment into the wood material;
A drying step of drying the wood material into which the pigment has been injected;
And a processing step of scraping off the front surface or the front and back surfaces of the wooden material after the drying.   5. The wood grain emphasizing method according to claim 1, wherein the wood material is a solid material or a laminated material.

Images