JP5633920B2 - Manufacturing method of wooden plate-like building materials - Google Patents

Description

  The present invention relates to a method for producing a wooden plate-shaped building material.

The surface of plate-like building materials used for building interior materials and furniture materials is easily damaged and scratched as it is, and various types of light resistance are provided to suppress variations in ground color. For this reason, it is painted.
As such a coating process, in order to emphasize the grain pattern, the entire surface including the grain formed by a canal (conduit) or the like is painted on the entire surface, and then the paint on the surface is wiped off or scraped. For example, a wiping painting process in which the wood grain is mainly painted.

  For example, in Patent Document 1 below, the spring material part of the veneer is scraped off by brushing to form a surface with irregularities, and then pre-colored, and then the pigment is rubbed into the concave part, and further painted. A method for manufacturing a veneered decorative board has been proposed. According to this, the part into which the pigment was rubbed up as a pattern and had an excellent texture or the like.

JP-A-5-76829 (see FIG. 1)

  However, in the painting process described in Patent Document 1 and the conventional wiping painting process, the paint is rubbed into the grain of road pipes and recesses, but other parts of the paint are removed by wiping or scraping. For this reason, it is difficult to ensure sufficient light resistance in parts other than the grain. In order to impart light resistance to the entire surface of the wood material, it may be possible to apply a deep colored coating, but there is a problem that the wood texture is hindered.

  This invention is made | formed in view of the said situation, and it aims at providing the manufacturing method of the wooden board building material which can give light resistance and can emphasize a grain pattern.

In order to achieve the above object, a method for producing a wooden plate-like building material according to the present invention uses a wood having grain that is connected by a road pipe, and the temperature difference between the surface temperature of the wood and the temperature of the wood core is 10. After the temperature has fallen within the temperature range, heat treatment is performed with high-pressure and high-temperature steam so that a holding time of 10 minutes or more is provided , and on the surface of the treated wood after the heat treatment, A colored coating treatment is performed so that a coating layer is formed including at least the inner peripheral surface of the surface side portion, and then the coating layer of the grain is left so that the portion between the grain is an inner layer portion of the treated wood. The surface layer including the coating layer formed on the surface so as to be exposed is removed by performing a surface polishing treatment.

In the present invention configured as described above, the heat-treated with high-pressure and high-temperature steam is applied to the wood, so that the treated wood after the heat-treatment is thermally colored as a whole and light resistance is imparted. The surface of this treated wood is subjected to a color coating process so as to form a paint film layer including wood grain, and the surface layer is removed, so that the paint film layer by the color paint remains on the wood grain part, otherwise In this part, the inner layer portion of the treated wood that has been thermally colored is exposed. As a result, light resistance can be imparted to the entire surface of the wooden plate-like building material because the wood grain part is provided with the coating layer and the exposed part is provided with heat treatment with high-pressure and high-temperature steam. Therefore, it is not necessary to apply a dark colored coating or the like in order to impart light resistance or the like. For example, in addition to the above-described colored coating treatment, a low-concentration coating with a low concealing property that does not inhibit the color tone of the treated wood is applied. Thus, it can be used as a finish paint, or instead of or in addition, a clear paint can be used as a finish paint, so that the wood texture is not hindered.
In addition, since the treated wood is thermally colored by heat treatment with high-pressure and high-temperature steam, color unevenness or the like hardly occurs in the portion where the surface layer has been removed by the surface polishing treatment, and it has a good appearance. Woody plate-like building materials can be manufactured.
Furthermore, by performing a surface polishing treatment, the contrast between the exposed portion and the coating layer of the wood grain portion can be emphasized, and the wood grain pattern can be emphasized. In particular, the contrast between the wood grain part and the exposed part can be made more conspicuous by adjusting the processing conditions such as the processing temperature and processing time using high-pressure high-temperature steam, or the coating material used for the colored coating process.

  Thermal coloring by heat treatment of the high-pressure high-temperature steam as described above, light resistance imparting, by selectively thermally decomposing and changing the quality of hemicellulose among cellulose, hemicellulose and lignin, which are the main components of the wood composition component, A polymerizable colored material having high light resistance is uniformly generated throughout the wood fiber cell tissue, so that it is thermally colored and light resistance is imparted. At this time, the surface of the treated wood may be precipitated as a by-product of a low-light-resistant oxidation colored product that has been modified by a low molecular weight resin similar to phenol contained in lignin. In such a case, You may make it remove a surface deposit.

In the present invention, the treated wood after the heat treatment is sliced in a wet state to produce a sliced veneer, and this sliced veneer is attached to a wooden base material on the surface of the laminate. The colored coating treatment and the surface polishing treatment may be performed.
By applying heat treatment with high-pressure and high-temperature steam to the wood, homogenization of the wood is promoted. By slicing it in a wet state to produce a sliced veneer, slicing workability is improved. However, compared to wood that has not been heat-treated with high-pressure and high-temperature steam, reverse cracks that occur during slicing are less likely to occur, and productivity can be improved.
In addition, by sticking this slice veneer to a wooden base material and applying the colored coating treatment and the surface polishing treatment to the surface of the laminate, the same effect as described above can be obtained, and a low-cost wooden plate-like building material Can be manufactured.

The homogenization of the wood by the heat treatment of the high-pressure and high-temperature steam as described above is performed by decreasing due to the alteration due to the thermal decomposition of the hemicellulose. In particular, hemicellulose has a mediating role in immobilizing cellulose with lignin, and this alteration and reduction of hemicellulose has a greater effect on the dense part of the wood fiber cell tissue and promotes homogenization. .
The homogenized wood is less affected by the difference in density between the high-density part and the low-density part of the wood structure. In comparison, reverse cracks that occur during slicing are less likely to occur, and a relatively thick slice veneer can be produced efficiently. Thus, if the sliced veneer is formed thick, it is possible to more effectively prevent the deterioration of the appearance even when the surface after the coating treatment as described above is worn. That is, even when wear or the like occurs on the surface, the entire slice veneer is thermally colored and the above-mentioned coating layer is formed on the wood grain part. As long as the coating layer at the grain portion does not disappear, the appearance is not deteriorated before and after the wear and between that portion and the other portions, and deterioration of the appearance can be prevented.

In the present invention, the color coating treatment may be performed using a white paint.
With such a configuration, the contrast between the exposed portion after removal of the surface layer and the coating layer formed on the wood portion is more conspicuous, and the wood grain can be more emphasized.
In addition, the white paint film layer applied to the wood grain part can give an impression that natural wood has become white due to aging.
Such whitening of the wood grain part may cause deterioration of the inner wall of the canal (conduit) depending on the tree type, and the part may be whitened due to secular change. According to the present invention configured as described above, such whitening can be artificially expressed, and a woody plate-shaped building material with higher design can be manufactured.

  According to the method for manufacturing a wooden plate-shaped building material according to the present invention, it is possible to provide light resistance and to manufacture a wooden plate-shaped building material with high design characteristics that emphasizes the grain pattern by having the above-described configuration. can do.

It is a schematic flowchart for demonstrating one Embodiment of the manufacturing method of the wooden plate-shaped building material which concerns on this invention. (A) is a schematic side view schematically showing an example of a system configuration of a heat treatment apparatus used in the manufacturing method, and (b) schematically shows a state in which woods to be heat-treated by the heat treatment apparatus are stacked. (C) is a schematic front view which shows typically the state which accommodated the laminated | stacked wood in the heat processing apparatus. (A)-(c) is a conceptual explanatory drawing for demonstrating all the manufacturing methods. (A)-(c) is notional explanatory drawing for demonstrating the same manufacturing method, respectively, The schematic enlarged longitudinal cross-sectional view corresponding to the X section in FIG.3 (c), (d) is It is a partially broken schematic plan view which shows typically the wooden board-shaped building material manufactured by the manufacturing method. It is a table | surface which shows the result of the evaluation test of an example of a wooden plate-shaped building material manufactured by the manufacturing method, and a comparative example.

Embodiments of the present invention will be described below with reference to the drawings.
In this embodiment, as shown in FIG.4 (d), the rectangular plate-shaped thing is illustrated as the wooden board-shaped building material 10 manufactured with the manufacturing method of the wooden board-shaped building material which concerns on this embodiment, for example, It is good also as what is constructed as interior materials, such as a flooring material, a wall material, and a ceiling material. Or it is good also as what is used as other interior panel materials, door materials, various artificial members, furniture materials, etc.
As shown in FIG. 3C, the wooden plate-shaped building material 10 has a structure in which a wooden base material 12 and a slice single plate 13 on the surface side are laminated and integrated.
As will be described later, this slice veneer 13 is produced by slicing wood that has been heat-treated with high-pressure and high-temperature steam in a wet state.

First, a schematic configuration of an example of a heat treatment apparatus used in the method for manufacturing a wooden plate-shaped building material according to the present embodiment will be described with reference to FIG.
A high-pressure and high-temperature steam kettle (hereinafter referred to as a steam kettle) 20 as a heat treatment apparatus is configured by closing the opening of a horizontally long cylindrical container body 21 with an open / close lid 22 as shown in FIG. The opening / closing lid 22 hermetically seals the container main body 21 by a fastening means 29 such as a ferrule joint, a clamp joint, or a bolt / nut mechanism, and is detachable or openable with respect to the container main body 21. . FIG. 2C shows a state in which the opening / closing lid 22 is removed.
The container main body 21 and the opening / closing lid 22 are made of metal having a low pressure resistance such as stainless steel from the viewpoint of preventing metal contamination of the flitch material 1 (see FIG. 2C) as wood to be heat-treated. It may be made of a material.
As shown in FIG. 2 (c), a plurality of roller members 21a rotatably supported on both sides of the container body 21 are provided in the container body 21 from the opening side toward the back side. It has been. The roller member 21a is provided with a placement plate 8 on which an object to be processed is placed, and the flitch material 1 can be easily taken in and out.

A steam supply pipe 23 that supplies high-pressure and high-temperature steam from the high-pressure and high-temperature steam supply source 3 into the steam kettle 20 and a pressurized water supply that supplies pressurized water from the pressurized water supply source 4 to the steam kettle 20 are provided below the container body 21. A pipe 24, a drain pipe 27 that discharges liquefied water vapor and the like from the steam kettle 20, and a drain pipe 28 are connected.
Further, a pressurized air pipe 25 that supplies pressurized air from the pressurized air supply source 5 into the steam kettle 20 and an exhaust that discharges steam or gas from the steam kettle 20 are disposed above the container body 21. A tube 26 is connected.

As the high pressure / high temperature steam supply source 3, a high pressure boiler or the like may be employed.
As the pressurized water supply source 4, a high-pressure water tank, a high-pressure pump, or the like may be employed.
An air compressor or the like may be employed as the pressurized air supply source 5.
The above-described pipes 23, 24, 25, 26, 27, and 28 are provided with opening / closing valves 23a, 24a, 25a, 26a, 27a, and 28a in the middle of the respective pipes.
Further, the drain pipe 27 is provided with a steam trap 27b, a filter, and the like at appropriate positions along the pipe line.
The specific configuration of the high-pressure and high-temperature steam kettle 20 is not limited to that shown in the drawings, and any configuration may be used as long as the wood can be heat-treated with the high-pressure and high-temperature steam.

Next, an example of the manufacturing method of the wood board building material which concerns on this embodiment is demonstrated based on FIGS.
<Wood placement process (step 100)>
First, as shown in FIG. 2 (b), a plurality of (12 in the example) flitch materials 1, 1... As a heat treatment target are arranged in the horizontal direction and the height direction (thickness direction). 2) are stacked on the mounting plate 8 with the crosspieces 6 interposed therebetween, and are placed in the steam pot 20 as shown in FIG. 2 (c).
In addition, when the pressurized water is supplied and submerged in the cooling step described later, appropriate lifting prevention means 7 is disposed so that each flitch material 1 disposed in the steam pot 20 does not float.

  In the illustrated example, the lifting prevention means 7 is a weight 7 corresponding to the flitch material 1 disposed in the steam kettle 20, but the lifting prevention means 7 may be made of a metal net that is appropriately weighted. You may make it comprise. Alternatively, the uppermost flitch material 1 (or the crosspiece member 6 disposed above it) and the mounting plate 8 are fixedly held by winding a metal wire rope or the like to lift the flitch material 1. Any device can be used as long as it can prevent the above.

The crosspiece member 6 may be made of a metal material similar to that of the steam pot 20 or made of a wood material. Such a crosspiece member 6 may not be provided depending on the size of the wood as a heat treatment target (in this example, the flitch material 1). , The high-pressure and high-temperature steam can permeate into the wood relatively quickly, and an efficient heat treatment can be performed.
In the present embodiment, the bar member 6 is arranged so that the flitch material 1 disposed in the steam cooker 20 does not come into contact with the inner wall (the mounting plate 8 in the illustrated example) of the steam cooker 20. And between the mounting plate 8. Further, when the lifting prevention means 7 is a weight 7 as shown in the figure, a crosspiece member 6 is interposed between the weight 7 and the uppermost flitch material 1 so as not to contact with each other. You may make it make it.

The wood as the heat treatment target (in this example, the flitch material 1) contains a considerable amount of moisture such as raw material, boiled or steamed wood, etc. that has not been subjected to drying treatment. It is preferable from the viewpoint of permeability to water, and it may be a raw material having a moisture content of about 30% (dry base) or more.
In addition, as the raw material tree species, there are those having a grain 14 that is connected by a canal 14a (see FIGS. 4A and 4D). Preferably, the canal is arranged in a ring shape along the annual ring. Such ring-shaped or semi-ring-shaped material tree species may be mentioned. Examples of ring-hole-shaped tree species include oak, zelkova, sendan, sen, teak, white ash, and elm. Examples of semi-circular material-like tree species include walnut, spruce, and oak. In addition, any tree species may be applied as long as it has a relatively clear grain that is connected by a canal.

  In the present embodiment, the wood as the heat treatment target is the flitch material 1 processed into a prismatic shape, and in the present embodiment, at least one of length (thickness), width (width), and length. One of them is 180 mm or less, and in the illustrated example, the thickness is about half of the width and a long one is shown. In this way, in the heat treatment step and the cooling step, which will be described later, by making wood at least one of vertical (thickness), horizontal (width), and length is 180 mm or less, The temperature increase difference (temperature decrease difference) between the surface of the wood and the core can be reduced efficiently, and the surface cracking and strength deterioration of the wood can be reduced efficiently, and efficient heat treatment and cooling are executed. Can do.

<Heat treatment process (step 101)>
As described above, after the flitch material 1 is disposed in the steam kettle 20, the steam kettle 20 is sealed by the open / close lid 22, and the steam supply valve 23a, the exhaust valve 26a, and the drain valve 27a among the above-described valves are provided. The other valves 24a, 25a, and 28a are closed, high-pressure high-temperature steam is supplied into the steam kettle 20, and the air in the steam kettle 20 is replaced with steam.
Next, the exhaust valve 26a is closed from the above state, and high-pressure and high-temperature steam is supplied, and the temperature in the steam kettle 20 is gradually increased to a predetermined processing temperature, for example, at about 1 ° C./min to 3 ° C./min. Let
The treatment temperature (atmosphere temperature in the steam kettle 20) as the heat treatment conditions is 105 ° C. or more and 160 ° C. or less (in the pressure range, 0.2 kgf / cm ² G (about 0.02 MPaG) or more and 5.3 kgf / cm ² G (about 0.52 MPaG) or less, preferably about 150 ° C. (3.9 kgf / cm ² G (about 0.37 MPaG)) or less.
The processing temperature may be measured and controlled by, for example, an appropriate temperature sensor installed on the inner wall of the steam kettle 20, or the pressure in the steam kettle 20 may be measured by a pressure gauge or the like. You may make it control.

If the treatment temperature is less than the above lower limit temperature, the hemicellulose of the wood composition component is not sufficiently pyrolyzed, and there is a tendency that the homogenization of the wood and thermal coloring and light resistance imparting to the wood are not sufficiently achieved. If the upper limit temperature is exceeded, depending on the size of the wood as the heat treatment target and the treatment time, the thermal decomposition of hemicellulose tends to be excessive and the wood fiber cell tissue tends to deteriorate, and the strength of the wood tends to decrease. If the size of the wood is reduced and the treatment time is shortened, the strength of the wood will not deteriorate so much even at a treatment temperature exceeding 160 ° C. and below 190 ° C. Coloring and light resistance can be imparted to some extent.
This treatment temperature greatly contributes to the degree of coloration of the wood as a heat treatment target (in this example, the flitch material 1), and by appropriately setting this treatment temperature within the above range, the degree of coloration of the wood can be easily achieved. Can be controlled.

  In addition, the heat treatment with the high-pressure and high-temperature steam in the steam pot 20 includes the surface temperature (substantially the atmosphere temperature in the pot) of the wood (the flitch material 1 in this example) as the heat treatment target, and the wood core. You may make it set the process time as heat processing conditions so that the temperature difference with the temperature of this may be within 10 degreeC. Preferably, a holding time of about 10 minutes or more may be provided after the temperature difference is within 10 ° C. More preferably, the temperature of the wood core is maintained for about 10 minutes or more until the temperature reaches the same level (105 ° C. or higher, 160 ° C. or lower, preferably 150 ° C. or lower) as the above processing temperature. You may make it provide time.

By setting it as such processing time, the color nonuniformity inside a timber can be reduced, the homogenization of a timber can be improved more, and a yield and productivity can be improved.
The processing time after reaching the predetermined processing temperature depends on the wood species, size, temperature in the pot, etc., but with the above-mentioned size of the flitch material 1, for example, in the case of the above exemplified tree species It is good also as about 1 to 4 hours.
In addition, it may replace with the aspect which sets the said processing temperature, and you may make it control the coloring degree of wood by setting this processing time suitably.

<Wood cooling, pressure reduction process in the pot (step 102)>
After performing the heat treatment process as described above, the wood is cooled and the pressure in the steam kettle 20 is reduced.
It is preferable from the viewpoint of preventing dry cracking of the wood, etc., that the pressure reduction processing of the steam pot 20 is performed after the wood core is cooled to a predetermined temperature or less.
This predetermined temperature may be about 100 ° C. or lower, preferably about 90 ° C. or lower.
In the present embodiment, in order to improve the efficiency of the cooling process and prevent dry cracking of the wood more efficiently, the wood is submerged in a state where the inside of the steam kettle 20 is maintained at a predetermined high pressure state before the pressure reduction process is executed. And let it cool.

  That is, in this embodiment, after the heat treatment step is performed, the water vapor supply valve 23a is closed and the pressurized water supply valve 24a and the pressurized air supply valve 25a are opened so that the pressure in the steam pot 20 does not decrease. While maintaining the high pressure state, the flitch material 1 in the steam pot 20 is submerged and cooled. Preferably, the cooling may be performed while maintaining a high pressure state so that the pressure in the steam pot 20 is equal to or higher than the pressure during the heat treatment. Or, depending on the pressure at the time of heat treatment, a high pressure state that is slightly lower than the pressure at the time of heat treatment to such an extent that sudden pressure fluctuations occur and dry cracks do not occur on the surface of the wood after heat treatment. You may make it cool by submerging, keeping.

The predetermined high pressure state in the steam pot 20 during the cooling process is based on the measured value of a pressure gauge or the like while the pressurized water supply valve 24a and the pressurized air supply valve 25a are opened to supply pressurized water and pressurized air. The exhaust valve 26a may be adjusted by opening / closing control or opening control.
Further, the pressurized water is supplied so that the pressurized water supplied in the steam kettle 20 is not scattered in the steam kettle 20 in order to suppress pressure fluctuations in the steam kettle 20 and deterioration (metal fatigue) of the steam kettle 20 itself. It is preferable that the steam kettle 20 is gradually and gently supplied from below.
Further, in order to improve the cooling efficiency, when performing this cooling step, the pressurized water supply valve 24a and the drain valve 28a are controlled to open / close or the degree of opening is controlled so that the cooling water in the steam pot 20 is replaced. You may make it perform.

In the cooling step, instead of supplying the cooling water (pressurized water) directly into the steam pot 20, a container capable of storing the flitch material 1 and storing water is installed in the steam pot 20, You may make it supply pressurized water in this container. In this case, a water vapor supply pipe 23, a pressurized water supply pipe 24, a drain pipe 27, and a drain pipe 28 may be connected to the lower part of the container. In this case, the drain pipe 27 and the drain pipe 28 may be further connected to the lower portion of the steam pot 20. This container may be designed to be freely put into and out of the steam kettle 20.
In this way, by installing the container to which the pressurized water for cooling the flitch material 1 is supplied in the steam kettle 20, deterioration of the steam kettle 20 can be efficiently reduced. Further, in this case, the container may be made of stainless steel with little contamination as described above, and the steam kettle may be made of iron with pressure resistance. According to this, deterioration of the steam pot 20 can be reduced more efficiently.
Moreover, you may make it use the nitrogen gas from a viewpoint of the oxidation suppression of wood for the pressurized air introduce | transduced in the steam kettle 20 at the time of the said cooling process execution.

  Further, instead of supplying the cooling water and forcibly cooling the heat-treated wood (treated wood) as described above, after the heat treatment step, the water vapor supply valve 23a is closed and the wood core You may make it naturally cool until a part becomes below the said predetermined temperature. Alternatively, the steam supply port 23a is closed, and the pressurized air supply valve 25a and the exhaust valve 26a are controlled to open / close or open in a state where the inside of the steam vessel 20 is maintained at a predetermined high pressure state. It is good also as an aspect which replaces the inside gas and cools.

After performing the cooling step, the pressurized water supply valve 24a and the pressurized air supply valve 25a are closed, the exhaust valve 26a and the drain valve 28a are opened, and the pressure in the steam kettle 20 is returned to the atmospheric pressure. The cooling water inside is discharged out of the steam pot 20 (in-pot pressure reducing step).
When returning the pressure in the steam pot 20 to the atmospheric pressure, the pressure may be gradually returned to the atmospheric pressure so that a sudden pressure fluctuation does not occur.
The pressure reduction in the steam pot 20 may be performed by opening the exhaust valve 26a before discharging the cooling water in the steam pot 20 to the outside of the steam pot 20, or the exhaust valve 26a and the drain valve. 28a may be opened to discharge the cooling water. Further, after the cooling water is discharged (substantially, the pressure in the steam kettle 20 is lowered to some extent by discharging the cooling water). Alternatively, the exhaust valve 26a may be opened.

<Exact processing wood, assembly process>
After performing the above-mentioned pressure reduction process in the pot, the flitch material 1 as the treated wood is taken out from the steam pot 20 and subjected to precise finishing. For example, after being assembled in the assembly process described later, the flitch assembly 2 is sized to match the size (width and length) of the slice veneer 13. At this time, both ends in the longitudinal direction may be precisely processed by cross-cut saw processing, and the other surfaces may be precisely processed by molder processing.
Due to the precise processing of the entire surface of the flitch material 1, the low-molecular resin similar to phenol contained in the lignin, which is a composition component of wood, is altered in the heat treatment step, and is generated as a by-product on the surface of the flitch material 1. The deposited oxidation coloring matter having low light resistance is removed, and the entire surface of the flitch material 1 becomes smooth. In the thickness direction, after the flitch assembly 2 is produced as described later without performing the above-described sizing treatment, a part of the surface layer portion and the back layer portion is removed by a slicer. May be.

After each flitch material 1 is precisely processed as described above, as shown in FIG. 3 (a), the thickness surface of the flitch material 1 is laminated and adhered so as to face the adjacent flitch material 1, and the flitch assembly is performed. The body 2 is produced.
In the present embodiment, four flitch materials 1 are joined in the longitudinal direction, and are bonded together so that the lateral direction becomes three rows. Further, in the longitudinal direction, the flitch materials 1 bonded together are staggered. The flitch material 1 cut to an appropriate length is distributed and assembled and bonded so as to be displaced in a shape.
As an adhesive used for the above-mentioned laminated adhesion, an adhesive capable of adhering the wet-state flitch material 1 may be used. For example, a moisture-curing urethane adhesive or the like may be adopted.

<Slicing process (step 103)>
The flitch assembly 2 produced as described above is introduced into a laterally slicing machine in a wet state, sliced to a predetermined thickness, and as shown in FIG. Is made.
Here, the wet state refers to a state in which the moisture content of the flitch assembly 2 as a slice processing target after the heat treatment step is not less than a predetermined level, and the moisture content of the flitch assembly 2 is 30%. It is preferable from the viewpoint of slicing workability to be about the above.

The wood that has been heat-treated with high-pressure and high-temperature steam as described above (in this example, the flitch assembly 2) is homogenized, so that the wood is sliced in a wet state to produce a slice veneer 13 By adopting an aspect to improve slicing workability, compared to wood not subjected to heat treatment with high-pressure and high-temperature steam, reverse cracks that occur during slicing are less likely to occur, and a thick sliced veneer is efficiently produced. Can be produced.
Further, as in this embodiment, the wood as the heat treatment target is the flitch material 1 and the sliced single plate 13 is produced by slicing the flitch assembly 2 in which the flitch material 1 is assembled and bonded. However, since the slicing processability is improved even when the thickness is relatively thick, the sliced single plate 13 made of a plurality of sliced flitch materials can be easily obtained by slicing the flitched assembly 2 to which the flitched material 1 is assembled and bonded. Can be made. Therefore, in the subsequent laminating process, it is not necessary to stick a plurality of single plates so that they are individually arranged on the wooden base material, and the manufacturing process can be simplified.
Furthermore, for example, the heat treatment conditions (the treatment temperature, the treatment time, etc.) of each flitch material 1 to be assembled at the time of the heat treatment step described above are appropriately set, and the coloring degree of each flitch material 1 is adjusted. Thus, the flitch material 1 having a different color tone can be produced. The flitch materials 1 having different color tones are combined, bonded and sliced according to the taste and the like, and sliced to produce sliced single plates 13 having various pattern patterns (randomly stuck, parquet, checkered, etc.) You can also.

The above-mentioned predetermined thickness may be about 0.15 mm to 0.25 mm as in the case of a general projecting plate, but preferably, slicing workability, cost performance, designability of a wooden plate-shaped building material, reduction of appearance deterioration, etc. From the viewpoint, it may be about 0.30 mm or more and 2.25 mm or less, more preferably about 0.35 mm or more and 2.00 mm or less.
If the predetermined thickness is less than the lower limit thickness, the wear resistance tends to be low, and after the laminate 11 (see FIG. 3C) to be described later is manufactured, the shape is appropriately formed on the surface side thereof. When forming the groove part or the chamfered part, the degree of exposure of the wooden substrate 12 (see FIG. 3C) tends to increase, and the design property tends to deteriorate. On the other hand, if the thickness exceeds the upper limit, the cost tends to be high and the slice workability tends to be deteriorated, and the back surface of the slice single plate tends to crack.

  In the present embodiment, the wood as the heat treatment target is the flitch material 1, and the sliced plate 13 is produced by slicing the flitch assembly 2 in which the flitch material 1 is assembled and bonded as described above. However, it is not limited to such a mode. For example, the heat treatment target is a thick plate having a shape that matches the size of the desired wooden plate-shaped building material, and the above steps are executed on the plate as necessary, and then the plate is sliced. A slice veneer may be produced. In other words, one of the flitch materials is shaped according to the desired size of the wooden plate-shaped building material, and after performing each of the above steps as necessary, the slices can be sliced from the flitch material without assembling. You may make it produce a board.

<Lamination process (step 104)>
As shown in FIGS. 3 (b) and 3 (c), the sliced veneer 13 produced as described above is adhered to the wooden substrate 12 to produce the laminate 11.
As an adhesive used for this lamination | stacking adhesion | attachment, it is good also as various water-based adhesives, an emulsion adhesive, etc. For example, it is good also as a vinyl acetate adhesive or a rubber latex emulsion adhesive.
Moreover, after laminating the wooden substrate 12 and the sliced veneer 13 via an adhesive, it may be introduced into a hot press machine (hot press machine) and heated and pressed to be dried and cured.
The wood substrate 12 and the slice veneer 13 are laminated and bonded with a paper material or the like in order to promote the release of water vapor from the adhesive or slice veneer during hot pressing. Also good.
In addition, depending on the type of adhesive, instead of the heat-clamping mode, a cold press or natural drying may be used.

  As the above-mentioned wood base material 12, wood laminate boards such as plywood and LVL (single board laminate), wood boards such as particle boards, or wood fiber boards such as insulation boards and MDF (medium density fiber boards) The thing which processed the woody material into the plate shape is mentioned. Alternatively, a wood powder / plastic composite material (WPC) containing a wood powder, an inorganic filler, a compatibilizing agent, a colorant and the like in a predetermined content ratio may be processed into a plate shape in a synthetic resin material. These may be appropriately combined and laminated to form the wooden substrate 12. For example, the wood substrate 12 may be configured by laminating MDF, WPC, or the like having a relatively high surface hardness on the surface of a plywood or particle board.

<Coloring treatment process (step 105)>
On the surface 11a of the laminate 11 produced as described above, as shown in FIG. 4A, a relatively large road tube 14a arranged in an annular shape along the annual ring is exposed. A continuous grain 14 (see FIG. 4D) is formed by 14a. There is no large canal between the grain lines 14 and there is a relatively smooth part 15 (hereinafter abbreviated as a part 15 between grain parts).
In the present embodiment, as shown in FIG. 4B, the inner peripheral surface (hereinafter referred to as the following) of at least the surface side portion of the canal 14a forming the wood grain 14 on the surface 11a of the laminate 11 using a predetermined paint. In some cases, it may be abbreviated as “inside the pipe.”) The colored coating process is performed so that the coating layer 16 is formed.
In the present embodiment, a white paint is used as the predetermined paint.

The white paint as described above may be, for example, an aqueous synthetic resin paint obtained by diluting an aqueous synthetic resin colorant mainly containing a white pigment such as titanium oxide as a coloring component with a diluent. You may make it add a viscosity modifier and surfactant suitably to such an aqueous synthetic resin colorant. In addition, the blending ratio of the pigment to the diluent is the color tone or hue between the wood grain coating layer 16a (see FIG. 4 (b)) applied to the above-mentioned canal and the ground color of the sliced veneer 13 after the heat treatment. In order to make this difference stand out, it is sufficient to use a paint with a relatively high concealment and a high concentration. Such a dilution ratio of the paint can be appropriately selected depending on the application method from the viewpoint of applicability.
Moreover, the ratio of the various colors of the pigment or dye as the coloring component of the paint described above can be appropriately selected according to the desired color tone of the in-grain coating layer 16a remaining after the surface polishing treatment described later.

Various coating methods can be adopted as the coating method, but a roll coater method is used so that the coating layer 16 (wood grain coating layer 16a) is also formed in the pipe. Alternatively, application may be performed by application with a sponge roll and scraping with a metal reverse roll.
After the coating material is applied, the coating material is dried to form the coating layer 16 on the entire surface 11a of the laminate 11.
Drying of the paint may be natural drying or hot air drying. Alternatively, for example, when an ultraviolet curable coating is employed as the coating, it may be cured using an ultraviolet irradiation lamp or the like, and the uncured portion of the surface may be removed by polishing or wiping as appropriate.
In addition, before performing the said color coating process, you may make it the surface 11a of the laminated body 11 smooth by grinding | polishing means, such as a wide belt sander, in order to improve the stability of cloth coloring.
Further, the predetermined paint is not limited to a white paint, and is relatively relatively high, such that the color tone or hue contrast between the in-grain coating layer 16a and the ground color of the slice veneer 13 after the heat treatment stands out. It is sufficient to use a paint with high concealment and high concentration, and an appropriate color system such as reddish brown, green or yellow can be selected.

<Surface polishing process (step 106)>
After forming the coating layer 16 on the surface 11a of the laminate 11 as described above, the surface layer 17 (see FIG. 4C) including the coating layer 16 is removed by performing a surface polishing treatment. .
The surface polishing treatment may be performed using an appropriate polishing means. For example, a wide belt sander or a planar may be used as the polishing means.
In addition, the thickness of the surface layer that is removed by grinding by this surface polishing treatment is such that the inter-grain coating layer formed on the surface of the inter-grain portion 15 as shown in FIGS. 4 (b) and 4 (c). What is necessary is just to make it the extent which 16b is removed and the surface layer part of the slice single board 13 is exposed between the grain.
By this surface polishing treatment, as shown in FIG. 4 (c), on the surface of the laminate 11, the intra-grain coating layer 16a applied by the above-mentioned coloring coating treatment and the exposed portion 15a of the slice veneer 13 ( Hereinafter, the abbreviated exposure portion 15a appears.

<Finishing process (Step 107)>
A clear paint is further applied as a finish coating to the surface of the laminate 11 subjected to the surface polishing treatment as described above. As described above, the exposed surface 15a where the inter-grain coating layer 16b is removed and the coating layer is not formed is present on the surface of the laminate 11 by the surface polishing treatment. The slice veneer 13 is subjected to heat treatment with high-pressure and high-temperature steam as described above, so that the entire slice veneer 13 is thermally colored and light-resistant.
Therefore, in this embodiment, in order to provide light resistance and the like, a finish coating with a clear paint is applied without applying a dark colored coating or the like.

In place of such a finish coating with a clear paint, a low-concentration paint having a low concealing property that does not hinder the surface tone of the laminate 11 subjected to the surface polishing treatment is applied to obtain a finish paint. Alternatively, in addition to this, a finish coating with a clear paint may be applied.
Moreover, before this finish coating process, you may make it form the several groove part 18 (refer FIG.4 (d)) vertically and horizontally, or may form a chamfer part in a surface peripheral part.
The groove 18 may be formed along the joint (seam) of the flitch materials 1 that are assembled and bonded as described above.

Through the respective steps as described above, the wooden plate-shaped building material 10 is manufactured as shown in FIG.
As described above, according to the method for manufacturing a wooden plate-shaped building material according to the present embodiment, the in-grain coating layer 16a by colored coating remains in the portion of the grain 14, and the other portion (exposed portion) 15a. In this case, the inner layer portion of the sliced single plate 13 that has been subjected to thermal coloring is exposed. As a result, light resistance is imparted to the entire surface of the woody plate-shaped building material 10 because the grain part is provided with the in-grain coating layer 16a and the exposed part 15a is provided with light resistance by heat treatment with high-pressure and high-temperature steam. be able to. Therefore, it can be set as the finish coating which does not inhibit the above wood textures.
Further, since the slice veneer 13 is thermally colored up to the inside by heat treatment with high-pressure and high-temperature steam, color unevenness or the like hardly occurs in the portion where the surface layer has been removed by the surface polishing treatment, The woody plate-shaped building material 10 with good appearance can be manufactured.

Furthermore, by performing the above surface polishing treatment, the contrast between the exposed portion 15a and the wood grain coating layer 16a in the wood portion can be emphasized, and the wood grain pattern can be emphasized.
In particular, in the present embodiment, since the above-described color coating treatment is performed using the white paint as described above, the exposed portion 15a after the surface layer 17 is removed and the wood portion are formed. The contrast with the wood grain coating layer 16a is more conspicuous, and the wood grain 14 can be more emphasized.
Further, the white wood grain coating layer 16a applied to the wood grain part can give an impression that natural wood is whitened due to aging.

Moreover, in this embodiment, since the said color painting process and the said surface grinding | polishing process are performed to the surface 11a of the laminated body 11 produced by sticking the slice veneer 13 to the wooden base material 12, it is low. An inexpensive wooden plate-like building material 10 can be manufactured.
In addition, by heat treatment with high-pressure high-temperature steam, the wood is homogenized and sliced in a wet state to produce a sliced single plate, thereby improving slicing workability and heat treatment with high-pressure high-temperature steam. Compared with wood that has not been subjected to slicing, reverse cracks that occur during slicing are less likely to occur, and productivity can be improved.

In addition, in this embodiment, although the object of the said color painting process and surface polishing process is made into the surface of the laminated body which affixed the slice veneer to the wooden base material, it is not restricted to such an aspect. It is not restricted to the thing of such a laminated structure, You may make it perform each said process suitably with respect to the surface of the board | plate material etc. which the said heat processing was made.
Moreover, you may make it give a sander mark so that an uneven | corrugated | grooved part may be artificially formed in the surface of a laminated body, for example with a rough count sander etc., before performing the said color coating process. In this case, in the surface polishing treatment step, the surface layer may be removed so that the coating layer remains in the concave portion of the sander mark. According to such an aspect, it is possible to produce a woody plate-shaped building material with a richer expressive design by the wood grain pattern by the above-mentioned wood grain coating layer and the coating layer remaining in the concave portion of the sander mark. .

Furthermore, in the present embodiment, an example in which a groove portion or the like is processed before the finish coating after performing the above-described color coating treatment and surface polishing treatment has been described. You may make it give.
Furthermore, such grooves or the like may not be provided, and the formation location and number of the grooves can be appropriately selected from the viewpoint of design and the like, and along all the vertical and horizontal seams as shown in the figure. Instead of forming the groove portion, the groove portion may be formed only at the joint along the longitudinal direction, for example.
Moreover, when manufacturing a wooden plate-like building material to be constructed as an interior material such as a flooring, a male part and a female real part that are actually joined to an adjacent wooden plate-like building material at the four peripheral ends of the laminate as appropriate. The real part may be formed.

Next, an example of a wood board building material manufactured by the manufacturing method according to the present invention and a comparative example will be described based on the table of FIG.
In Examples and Comparative Examples, the wood substrate is a plywood having a thickness of 12 mm, and the raw oak material having a moisture content of about 40 to 62% (dry base) is a predetermined size (thickness 50 mm, Twelve flitch materials formed to have a width of 110 mm and a length of 620 mm were used as wood for heat treatment.

<Flitch material processing conditions>
In Example and Comparative Example 2, the 12 flitch materials were laminated with a crosspiece interposed in the same manner as described above, and the heat treatment with high-pressure and high-temperature steam was performed. The treatment temperature during this heat treatment was 135 ° C., the temperature raising time was 1 hour, and the subsequent treatment time was 2 hours.
Moreover, after performing the said heat processing by a high voltage | pressure high temperature steam, it submerged and cooled, maintaining a high voltage | pressure state as mentioned above. The cooling time was 30 minutes, and after cooling until the flitch material temperature was 90 ° C. or lower, the inside of the steam kettle was depressurized, and the flitch material was taken out and precisely processed. Next, the flitch material was assembled and bonded with a moisture-curing urethane adhesive as described above to produce a flitch assembly of a predetermined size (thickness 50 mm, width 300 mm, length 1800 mm).
On the other hand, in Comparative Example 1, the above-mentioned 12 flitch materials were subjected to precise treatment without being subjected to heat treatment with high-temperature and high-pressure steam, and bonded together to produce a flitch assembly of the predetermined size.

<Slicing conditions>
Each of the flitch assemblies produced as described above was sliced with a transverse slicer to produce sliced single plates having a predetermined thickness (0.35 mm).

<Lamination conditions>
Each slice veneer produced as described above was laminated and adhered to the surface of the wood substrate with a vinyl acetate adhesive to produce a laminate. After the lamination, it was introduced into a hot press machine (hot press machine) and heat pressed. The pressing conditions at this time were a mold surface temperature of 110 ° C., a pressing pressure of 4 kgf / cm ² (about 0.39 MPa), and a pressing time of 60 seconds.

<Surface treatment conditions>
The colored coating treatment described above was performed on the surface of each of the laminates produced as described above.
As a fabric coloring treatment, aqueous colorant (white pigment (titanium oxide) 98%, black pigment (carbon black) 2% with viscosity modifier and surfactant added) diluted to 25% with dedicated diluent The dough-colored paint was used.
This dough-colored paint was applied with a sponge roll and scraped with a reverse roll, so that the coating amount was 14 to 16 g / m ² . After the application, it was dried with a hot air dryer at 140 ° C. for 45 seconds.
Next, the above-described surface polishing treatment was performed on each of the laminates of Examples and Comparative Example 1 that were colored as described above. The surface layer was removed using a 240th wide belt sander as a polishing means.
On the other hand, the surface polishing treatment was not performed on the laminate of Comparative Example 2.

Further, the following clear coating was performed as a finish coating on the laminates of the examples and the comparative examples.
As an undercoat, urethane-based clear paint (Sanyu Paint Co., Ltd. NYX-S-701) was applied with a rubber roll at 80 g / m ^{2 and then} dried with a blower. Next, polishing finish processing is performed with a 240th wide belt sander, and urethane-based clear paint (Sanyu Paint Co., Ltd. NYX-E-800) is applied as a top coat with a rubber roll at 60 g / m ² and then dried with a blower. And painted clear.

<Evaluation Test 1 External Visual Observation>
The surface of each wood board building material which concerns on each example of the said Example and Comparative Examples 1 and 2 was visually observed.
The results are as shown in the table of FIG. 5. In the example, a white coating layer remains clearly only in the wood grain part, and the contrast with other parts stands out. It was.
On the other hand, in Comparative Example 1, since the heat treatment with high-pressure and high-temperature steam was not performed, the sliced single plate exposed by removing the surface layer was not subjected to thermal coloring, and the contrast with the wood grain portion was an example. The result was smaller than that.
Moreover, in the comparative example 2, since the said surface polishing process was not performed, the whole surface was colored white and the grain of wood was unclear.

<Evaluation Test 2 Fading Resistance Test>
Each wood plate building material (test piece) according to each of the above examples and comparative examples 1 and 2 was cured, and then irradiated with a light resistance tester (xenon lamp fade meter) for 48 hours, and the change before and after the irradiation was performed. Fading was measured with a spectrocolorimeter (L ^* a ^* b ^* color system), and the color difference ΔE was judged to be 5.0 or less as an acceptance criterion.
The results are as shown in the table of FIG. 5. In the example, the color difference ΔE = 2.7, and in the comparative example 2, the color difference ΔE = 1.4.
In the examples, the above-mentioned coating layer remains in the wood grain part, and light resistance is imparted to the other exposed parts by heat treatment with high-pressure and high-temperature steam. . On the other hand, in Comparative Example 2, it is considered that such a result was obtained because the entire surface was subjected to the color coating treatment with the white paint as described above.
In Comparative Example 1, the color difference ΔE was 9.7, and a noticeable color change was observed. In Comparative Example 1, since the slice single plate was not subjected to the heat treatment with high-pressure and high-temperature steam, the discoloration was noticeable in the portion where the surface layer was removed by the surface polishing treatment, which is considered to be the result.

  As described above, according to the method for manufacturing a wooden plate-shaped building material according to the present invention, it was shown that light resistance can be imparted and that a wooden plate-shaped building material with high design that emphasizes the grain pattern can be manufactured. .

1 Flitch material (wood)
2 Flitch assembly (treated wood)
10 Woody building material 11 Laminated body 11a Surface of laminated body (surface of treated wood)
12 Wood substrate 13 Slice veneer (treated wood)
13a Surface of sliced veneer (surface of treated wood)
14 Wood grain 14a Road pipe 16 Coating layer 16a Wood grain coating layer 17 Surface layer

Claims (3)

High-pressure and high-temperature so that a wood having a grain connected by a canal is provided with a holding time of 10 minutes or more after the temperature difference between the surface temperature of the wood and the temperature of the wood core is within 10 ° C. Colored so that a coating layer is formed on the surface of the treated timber after the heat treatment, including at least the inner peripheral surface of at least the surface side portion of the canal that is exposed on the surface and forms the grain. With a paint treatment,
Next, the surface layer including the coating layer formed on the surface is subjected to surface polishing treatment so that the coating layer of the wood remains and the portion between the grains exposes the inner layer portion of the treated wood. The manufacturing method of the wooden board-shaped building material characterized by removing by this. In claim 1,
The treated wood after the heat treatment is sliced in a wet state to produce a slice veneer, and the colored coating treatment is performed on the surface of the laminate produced by pasting the slice veneer on a wooden substrate. And the manufacturing method of the wooden board-shaped building material characterized by performing the said surface polishing process. In claim 1 or 2,
A method for producing a woody plate-shaped building material, characterized in that the above-mentioned coloring coating treatment is performed using a white paint.

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