JP3563617B2 - Patterned synthetic wood and method for producing the same - Google Patents

Description

【００４０】
【表２】

【００４１】
【表３】

【００４２】
【表４】

表１〜４中、「直角」及び「平行」は、照明方向を微細な溝の方向に対して直角とした場合及び平行とした場合であり、照明方向により測定値が異なることがわかる。また、「スキン層」は押出し直後の未加工物の測定結果、「＃２２０」「＃１５０」、「＃８０」、「＃４０」は使用したサンディングベルトの番手、「溶融」は全面に微細な溝を加工した後、１８０℃に温度調整した鋼球を表面に押当てた部分を測定した結果である。
表１〜４に示される結果から、合成木材の色がＹ値が２０以下の濃色系であれば、表２〜４に示されるようにサンディング加工部と非加工部（スキン層）のＹ値の差が大きく、濃淡模様が明瞭に現われるが、表１に示されるように未加工面のＹ値が２０より大きい淡色系の場合、サンディング加工部と非加工部のＹ値の差が小さく、濃淡模様が明瞭でなくなることがわかる。
【００４３】
【発明の効果】
以上のように、本発明によれば、オレフィン系樹脂と木質系充填剤を含有してなる合成木材の表面に、サンディング、ブラッシング等の研削加工により多数の微細な溝を形成し、あるいはこれを部分的に加熱及び／又は加圧して押しつぶし、光散乱の異なる部分を形成することによって、光散乱の違いによる色の濃淡模様を現出させるものであるため、立体的な質感を有し、しかも柾目模様、板目模様など所望に応じて任意の模様が形成された模様付合成木材が得られる。しかも、成形後の合成木材に上記のような加工を施すだけの簡便な方法により、上記のような模様付合成木材を生産性良くかつ低コストで製造できる。
【図面の簡単な説明】
【図１】本発明に用いるサンディング装置の基本構成例を示す部分斜視図である。
【図２】サンディングベルト押当てローラーの一例を示す斜視図である。
【図３】サンディングベルト押当てローラーの他の例を示す斜視図である。
【図４】サンディングベルト押当てローラーのさらに他の例を示す斜視図である。
【図５】微細な溝を押しつぶすための金属治具の一例を示す斜視図である。
【図６】微細な溝を押しつぶすための金属治具の他の例を示す斜視図である。
【図７】微細な溝を押しつぶすための金属治具のさらに他の例を示す斜視図である。
【図８】微細な溝を押しつぶすための金属治具の別の例を示す斜視図である。
【図９】微細な溝を押しつぶすための金属治具のさらに別の例を示す斜視図である。
【符号の説明】
１ 送りベルト
４ サンディングベルト
７，７ａ，７ｂ，７ｃ サンディングベルト押当てローラー
９ａ，９ｂ，９ｃ 溝
１０ａ，１０ｂ，１０ｃ 突条（突部）
１１ａ，１１ｂ，１１ｃ，１１ｄ，１１ｅ 金属治具[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a patterned synthetic wood in which a light and shade pattern of color appears in a synthetic wood obtained from an olefin-based resin and a wood-based filler due to a difference in light scattering, and a method for producing the same. The present invention particularly relates to a technique for giving a wood grain pattern to the surface of synthetic wood in which wood powder is filled in polypropylene to give an appearance close to that of natural wood.
[0002]
[Prior art]
An extruded synthetic wood material obtained from an olefin-based resin and a wood-based filler has a skin-like feel of a plastic as it is because it has an olefin-based resin skin layer on the surface. By removing the skin layer on the surface, the inner wood powder is exposed on the surface, and a wood-like touch is obtained. However, in this method, the texture of the surface approaches that of wood, but the appearance is uniform with no pattern.
Conventionally, as a method of giving a grain pattern to an extruded resin molded product, a method using printing or a flow pattern has been proposed.
[0003]
For example, in Japanese Patent Application Laid-Open No. 9-216500, a thermoplastic resin extruded product containing wood powder is subjected to (1) removal of a skin layer on the surface by grinding to form many scratches, and (2) coloring. A method has been proposed in which an agent is applied and (3) grinding is performed again so as to leave a colored layer in the concave portion of the scratch, (4) a wood pattern is printed, and (5) a top coat is applied with a transparent paint. . However, in such a method, the grain pattern is obtained by printing, and the grain pattern itself is colored by printing ink. When a printing ink is used, deterioration of the working environment due to evaporation of the solvent becomes a problem, and exhaust equipment is required. In addition, curing is required until drying, which complicates the process. Further, there is a problem that it is difficult to sufficiently express a three-dimensional texture.
[0004]
Japanese Patent Publication No. 3-59803 describes a method in which a resistance plate or a rod is provided in an extrusion die to change the extrusion flow, and a grain is formed by a flow pattern. However, in the method using such a flow pattern, it is difficult to arbitrarily prepare a grain, and in order to change the grain pattern, it is necessary to change the structure of the dice. Further, the pattern becomes parallel to the extrusion direction, and a pattern other than a straight grain cannot be formed.
[0005]
In the methods described in JP-A-9-216500 and JP-B-3-59803, the skin layer on the surface is removed by grinding the surface of the molded article, but the grinding itself causes the formation of a grain pattern. Is not involved. Furthermore, Japanese Patent Application Laid-Open No. 8-267597 discloses the removal of a skin layer by grinding the surface, but this is also for making the texture of the surface close to that of wood, not for forming a pattern. .
[0006]
[Problems to be solved by the invention]
As described above, in order to form a grain pattern on a synthetic wood surface, conventionally, it has been considered to use a printing or a flow pattern. However, in printing, the process becomes complicated and a three-dimensional texture cannot be sufficiently expressed. On the other hand, an arbitrary pattern cannot be formed in a flowing pattern.
Accordingly, an object of the present invention is to provide a patterned synthetic wood having a three-dimensional texture and an arbitrary pattern formed as desired such as a straight grain pattern or a plate grain pattern. It is a further object of the present invention to provide a method for producing such a patterned synthetic wood by a simple method with good productivity and low cost.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, there is provided a synthetic wood containing an olefin resin and a wood-based filler in an amount of 20 to 70% by weight,The stimulus value Y of the non-scattering surface before processing is 20 or lesssurfaceToStreakyDepending on the presence or absence of fine groovesDifferent parts of light scatteringAre formed, and are composed of a light-colored portion provided with many fine grooves and a dark-colored portion without fine grooves.Patterned synthetic wood characterized by light and shade patterns due to differences in light scatteringAlternatively, synthetic wood containing an olefin-based resin and a wood-based filler in an amount of 20 to 70% by weight, wherein a non-scattering surface before processing has a stimulus value Y of 20 or less, and a large number of streaks are formed. Different parts of light scattering due to the density of fine grooves are formed, and the color difference due to light scattering consisting of light-colored parts with densely formed fine grooves and dark-colored parts with densely formed fine grooves is formed. Patterned synthetic wood characterized by having a shade patternIs provided. In a preferred embodiment, the olefin resin is polypropylene and the wood filler is wood flour synthetic wood.You.
Basically, such patterned synthetic wood forms portions having different light scattering in a streak shape by performing a grinding process for forming a large number of fine grooves on the surface of the synthetic wood.Then, a light-colored part with a large number of fine grooves and a light and shade pattern of color due to the difference in light scattering consisting of a dark-colored part without fine grooves, or a light-colored part with fine grooves formed densely, Form a light and shade pattern of color due to the difference in light scattering consisting of dark portions with sparsely formed groovesIt can be manufactured by the method described below.
In addition, the said wood-based filler 20-70 weight% means the ratio with respect to the total weight of synthetic wood.
[0008]
The streaked light and shade pattern includes various modes based on the presence or absence of a large number of fine grooves, density, differences in the shape and size of ridges between grooves, differences in directions, and the like.
First, in the first mode, the difference in light scattering is due to the presence or absence of fine grooves provided on the surface, and has a light-colored part provided with a large number of fine grooves and a dark-colored part without fine grooves. It is characterized by.
The patterned synthetic wood of this embodiment can be manufactured by subjecting the synthetic wood surface to a partial streak-like grinding process.
[0009]
Next, in the second aspect, the difference in light scattering is due to the density of a large number of fine grooves provided on the surface, and the light-colored portion where the fine grooves are densely formed and the fine grooves are densely formed. It is characterized by having a dark portion.
The third mode is characterized in that the difference in light scattering is due to a large number of fine grooves provided on the surface, and the ridges between the fine grooves have minute irregularities. In this embodiment, a light-colored portion having a depth or height of ridges of 5 to 50 microns is formed in a streak shape, a light-colored portion having a depth or height of 5 to 50 microns is formed, An embodiment in which a dark portion having a depth or height of 5 microns or less is formed is included.
[0010]
The patterned synthetic wood of the second and third aspects is characterized in that, during the grinding, the degree of grinding of the streak-like ground portion and the other ground portion (for example, the density and depth of many fine grooves, The unevenness and the size of the ridges of the ridges) to create a light and shade pattern due to the difference in light scattering between the streak-grinding part and the other grinding parts, or by using a different grinding material. It can be manufactured by a method in which more than one type of grinding is performed, the degree of grinding is varied depending on the type of abrasive used, and a light and shade pattern of color is produced based on the difference in light scattering based on the degree of grinding. Furthermore, it can be manufactured by a method in which a large number of fine grooves are uniformly formed on the surface by grinding, and then ground again in a streak shape.
[0011]
Further, the fourth aspect is that the difference in light scattering is due to the difference in the direction of a large number of fine grooves provided on the surface, and the direction of the fine grooves in the light-colored part and the dark-colored part is different. I have.
The textured synthetic wood of this embodiment uses two or more types of abrasives, and a grinding direction by one abrasive (or a direction of a rotating shaft for rotating the abrasive) and a grinding direction by the other abrasive (or this grinding direction). It can be manufactured by a method in which grinding is performed so that the direction of the rotation axis for rotating the material is different, and a color shading pattern is revealed by the difference in the direction of a large number of fine grooves to be formed.
[0012]
The above-described embodiments can be arbitrarily combined and adopted. For example, if the synthetic wood has streaky light-colored portions provided with a large number of fine grooves and dark-colored portions having no fine grooves formed therein, the depths of the numerous fine grooves in the streaked light-colored portions are determined by changing the depth of the streaks. The contour is shallow and gradually deepens toward the center of the streaks, or the number of fine grooves is gradually increased to form a streaky gray pattern with blurred streaks. Or, after forming a large number of fine grooves uniformly on the surface by grinding, various modes are possible, such as changing the direction of the grooves and processing a large number of fine grooves deeper in a streak shape. .
Further, the formation of the dark-colored portion can also be performed by forming a large number of fine grooves uniformly on the surface by grinding, and then partially heating and / or pressing the surface to crush the fine grooves on the surface. It can be carried out.
In addition, it is preferable to apply a clear coating film as a protective film on the surface of the synthetic wood on which a light and shade pattern formed by a large number of fine grooves in various modes as described above is formed.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
As described above, according to the present invention, there is provided a method in which a grain pattern is formed at the same time as a skin layer of synthetic wood is removed by grinding, and formation of the grain pattern and improvement of surface texture are achieved in one step. .
Generally, as shown in “Color Story”, pp. 51-55 (ISBN4-7655-4317-X), (1) the shape of the surface layer of an object, and (2) the light It changes depending on the state of reflection and transmission, (3) the position of the light source for illuminating the object, (4) the type of the light source, and (5) the position of the eye to see the object. Therefore, even if the degree of coloring is the same, different colors appear if the conditions (1) to (5) are different. The present invention focuses on the above (2) the state of reflection and transmission of light on the surface of an object, and utilizes the principle of different colors by changing the roughness of the surface.
[0014]
The incident white light is divided into two parts, a reflected light on the surface of the object and a light entering the inside. Most of the incident light is reflected by the surface of a substance having free electrons such as a metal, and enters the inside of other substances. The light that has entered inside goes straight without absorption and goes out of the substance at the other end of the substance. Glass appears transparent because there is no absorption in the visible region. In the case of colored glass, light of a specific wavelength is absorbed in the process of transmitting light through the glass, so that incident white light passes through the glass to be colored.
[0015]
If there is a scattering element in the substance, the incident light is scattered in the substance and returns to the entrance surface without going straight. Therefore, if there is no absorption, light having the same spectrum as the incident light is observed as scattered light. If there is an element in the substance that absorbs light, coloring occurs while the light travels through the substance. Therefore, the observed scattered light becomes colored light, and the color of the substance is observed with the colored light. If the light absorption of the substance is not selectable by wavelength in the visible region, the color becomes black or gray color having a saturation of 0, and if there is selectivity, the color becomes a color having saturation.
[0016]
At this time, the degree of coloring is determined by the absorption intensity per unit length and the concentration of the scattering element. If the substance contains more colored pigments and dyes, the absorption intensity per unit length increases, resulting in a more saturated, deeper, deeper color. On the other hand, when a scattering element is added, a color with strong whiteness and low saturation is obtained. This is because, as the density of the scattering element increases, the light is scattered closer to the surface, and the distance that the incident light transmits through the substance is shortened, so that coloring by the absorbing element is reduced. Here, the scattering element refers to a component or an element that causes light scattering due to a difference in refractive index from a substance, such as a white pigment, a filler, and a crystal or spherulite formed in a resin.
[0017]
The present invention provides a method for selectively providing different portions with different scattering properties on the surface of synthetic wood and showing different colors due to the difference in scattering properties. That is, synthetic wood containing a wood-based filler by providing a number of physical fine irregularities on the surface and providing the same scattering properties as the internal scattering elements, thereby providing regions of different colors on the surface of the molded article A wood grain pattern is provided on the surface. Since the light scattered on the surface does not enter the inside, it is less affected by the coloring element, and is light close to the incident light. As the amount of light scattered on such a surface increases, the saturation decreases and the color becomes strongly white.
Specifically, by providing many fine grooves on the surface, the amount of light scattered near the surface is increased, and the ratio of light scattered from the inside to the light scattered near the surface is changed. Is characterized by having a different color by lowering the color and having a pattern utilizing this difference in color.
[0018]
In order to form a pattern using such scattering, it is preferable that the base color be a dark color system. In the case of a light color system, since the whiteness is originally strong, the saturation is low, and the scattering effect of the surface is low. not big. Specifically, in Yxy-based color display, the stimulus value Y is required to be 20 or less. When Y exceeds 20, the change in color tone due to light scattering on the surface is small and is not clearly recognized as a pattern.
In this specification, Yxy-based color display is based on JIS K 7105, and the apparatus used for the measurement is a color difference meter CS-100 manufactured by Minolta Camera Co., Ltd.
[0019]
Irregular ridges are formed between a number of fine grooves provided on the surface, and when the depth or height of the ridges is 5 to 50 microns, the scattering effect is highest and clear chroma is obtained. Is obtained. Such unevenness of the ridge has a scattering effect on incident light at various incident angles, and a difference between a portion provided with a large number of fine grooves and a portion not provided with the fine grooves can be more clearly seen.
In order to provide fine grooves having such uneven ridges, relatively coarse grinding is used, and a method such as sanding can be suitably employed.
[0020]
When sanding is performed, a coarse sanding belt is preferably used. Specifically, the effect is large when a sanding belt of No. 80 or less is used, and the effect is small when the sanding belt is No. 120 or more. According to observation with an electron microscope, the surface ground using a sanding belt of No. 80 or less has irregularities as if torn off by a ridge. On the other hand, on the surface ground using a sanding belt of No. 120 or more, the ridge was relatively straight, and no large unevenness was observed.
The grooves as described above can be formed not only by sanding but also by brushing with a wire brush. By grinding the surface with a rotating brush, grooves are formed in a manner similar to sanding using a sanding belt. In this case, it is preferable to use a steel wire as the material of the rotating brush, and when brass is used, a sufficient groove cannot be obtained.
[0021]
When forming a pattern, grinding a part of the surface of the extruded material, forming a large number of fine grooves as described above, leaving the other part as the extruded surface, grinding with low saturation A pattern can be formed by the color difference between the portion and the non-ground portion having high saturation. In addition, a pattern can be formed by changing the shape and size of a fine groove and the shape of a ridge between grooves in a light-colored portion and a dark-colored portion by changing the grinding method, and changing the saturation of both. In this case, it is possible to form a pattern by grinding the whole with a fine sanding belt of No. 120 or more and grinding the light-colored portion again with a coarse sanding belt of No. 80 or less. Conversely, it is also possible to grind the entire surface with a coarse sanding belt of No. 80 or less, and then re-grind the dark portion with a fine sanding belt of No. 120 or more. Further, a pattern may be formed on three types of surfaces: a portion ground with a sanding belt of No. 120 or more, a portion ground with a coarse sanding belt of No. 80 or less, and an extruded surface that is not ground.
[0022]
Naturally, as described above, the portion where the density of the fine grooves is high has a lower saturation, and the whiteness becomes stronger. Conversely, the portion where the density is low has a smaller decrease in the saturation. Therefore, there is a difference in the color tone between the ground surface with the brush with the lower flock density and the ground surface with the brush with the higher flock density, and a deeper color is obtained on the ground surface with the brush with the lower flock density. The surface gives a whiter surface.
[0023]
Numerous fine grooves provided on the surface by these methods have a linear shape and a uniform direction, so that the direction in which scattering occurs relatively strongly with respect to the incident direction of light is weak. Direction exists. Using such a principle, it is also possible to form a pattern. Specifically, when processing a fine groove, grinding is performed from two or more directions, whereby a region in which the fine groove has a different orientation can be formed. Such a difference in color tone due to the orientation of the fine grooves is remarkable in the case of a deep color having a low Y value or in the case of grinding with a rough sanding belt.
[0024]
When sanding is performed, by adjusting the shape of the pressing roller of the sanding belt, the pressing force when the sanding belt cuts the material can be adjusted, and the shape of the fine groove can be controlled. Specifically, a groove is provided in the pressing roller so that the convex portion between the grooves is strongly pressed against the material, and the concave portion of the groove is weakly pressed against the material. The strongly pressed part is shaved deeply, and the weakly pressed part is shallowly shaved. For this reason, the shape and size of the fine grooves change, and are recognized as a color difference.
Hereinafter, the sanding used in the method of the present invention will be described with reference to the accompanying drawings.
[0025]
FIG. 1 shows a basic configuration of an example of a sanding device. In the drawing, reference numeral 1 denotes a feed belt, 2 denotes a feed belt driving roller for rotating the feed belt 1, and 3 denotes a feed belt for stretching the feed belt 1. It is a feed belt holding roller.
Below the feed belt 1, a sanding belt 4 is stretched by a sanding belt driving roller 5, a sanding belt pressing roller 7, and a pair of sanding belt guide rollers 6, 8 disposed on both sides thereof. The sanding belt pressing roller 7 is set in a positional relationship such that it protrudes slightly above the sanding guide rollers 6 and 8 disposed on the left and right sides thereof.
At the time of sanding, one (or both) of the feed belt 1 or the sanding belt 4 is lowered or raised to sandwich the synthetic wood A between them, and the synthetic wood A is transported by the rotating feed belt 1. In the meantime, the sanding belt 4 rotated at high speed by the sanding belt driving roller 5 is partially pressed by the sanding belt pressing roller 7 on the surface (the lower surface in FIG. 1) of the synthetic wood A, and sanding is performed. Is
[0026]
2 to 4 exemplify grooves of various shapes on the surface of the sanding belt pressing roller 7 shown in FIG.
The sanding belt pressing roller 7a shown in FIG. 2 has a plurality of grooves 9a and ridges 10a having a substantially triangular cross section (however, ridges and valleys are rounded) provided on the outer peripheral surface thereof in parallel in the circumferential direction. It is a thing. The sanding belt pressing roller 7b shown in FIG. 3 differs from the pressing roller 7a shown in FIG. 2 in that the groove 9b and the ridge 10b are substantially rectangular in cross section and the interval between the grooves is slightly wider.
On the other hand, in the case of the sanding belt pressing roller 7c shown in FIG. 4, grooves 9c and protrusions 10c are formed on the outer peripheral surface in a staggered manner in the rotation axis direction.
The cross-sectional shape, width, interval, arrangement (parallel, spiral, mountain, staggered, etc.) of the grooves and ridges (projections) formed on the outer peripheral surface of the sanding belt pressing roller are desired. It can be changed arbitrarily according to the pattern.
[0027]
As a grinding method, there is a method using an electric plane machine other than the brush and the sanding belt. The electric plane machine is a device for scraping the surface with a rotating blade, but by providing a partial difference in cutting property to this blade, a streak pattern can be formed. To prepare the blade of a plane machine, the following methods are conceivable: (1) providing a cut in a specific portion, (2) changing the rake angle of the specific portion, (3) cutting the blade tip of the specific portion. Smoothing, etc. can be considered.
[0028]
In addition, for synthetic wood in which many fine grooves are provided uniformly over the entire surface, many fine grooves are partially crushed by applying temperature and / or pressure to smooth the surface, thereby suppressing light scattering on the surface. As a result, it is possible to prepare a pattern having high saturation with respect to the surroundings which have increased whiteness due to scattering and form a pattern. That is, a metal jig whose temperature has been adjusted is pressed against the surface, the synthetic wood is moved in the longitudinal direction while being pressed, and simultaneously with the movement, the metal jig is moved in a direction perpendicular to the moving direction, so that it is delicate along the longitudinal direction. A wavy pattern is obtained. By using a plurality of such metal jigs at the same time, a grain pattern can be obtained. At this time, the metal jigs may move cooperatively or independently. Alternatively, the metal jig may be fixed and only the synthetic wood may be moved. In addition, by heating and adjusting the temperature of a roll having a predetermined pattern of protrusions formed on the surface of a metal roll and rotating the roll against the material surface, the pattern on the roll surface can be transferred.
[0029]
The material of the metal jig to be pressed is not particularly limited, and the shape is arbitrary. However, it is desirable that the shape of the surface of the metal jig in contact with the surface of the synthetic wood surface provided with a large number of fine grooves is a curved surface. With the curved surface, the central part can be pressed strongly and the peripheral part can be pressed lightly. As a result, the effect of crushing the fine grooves is large at the center and gradually smaller at the periphery, and the color change is darker at the center and lighter at the periphery. Can be
[0030]
The temperature of the metal jig is not an essential condition, and the desired smoothing can be achieved only by the pressure. However, when the metal jig is not heated, a relatively high pressure is required for smoothing. When a metal jig whose temperature is adjusted is used, a sufficient effect can be obtained by the weight of the metal jig in contact with the metal jig, and the apparatus can be simplified. The temperature of the metal jig whose temperature has been adjusted is set to be equal to or higher than the softening point of the resin material used for the synthetic wood and equal to or lower than the melting point + 20 ° C. When polypropylene is used as the base polymer, about 180 ° C. is suitable.
[0031]
FIGS. 5 to 9 show some examples of metal jigs for crushing which are used for crushing and smoothing a large number of fine grooves by applying temperature and / or pressure as described above.
The metal jig 11a shown in FIG. 5 is provided with a hemispherical metal pressing portion 12a at the tip, and the metal jig 11b shown in FIG. 6 is formed by processing the tip of a bar into a hemispherical shape to form the pressing portion 12b. The metal jig 11c shown in FIG. 7 is provided with a rectangular pressing portion 12c having rounded edges on both sides at the tip, and the metal jig 11d shown in FIG. 8 is provided with a spherical pressing portion 12d at the tip. . On the other hand, the metal jig 11e shown in FIG. 9 is a patterning roll in which a spiral fin-type pressing portion 12e that converges from both sides to the center on the outer peripheral surface of the roll is provided. Note that the shape of the pressing portion of the metal jig is not limited to the illustrated example, and can be arbitrarily changed according to a desired pattern.
[0032]
The surface of the synthetic wood having a large number of fine grooves formed by the method described above needs to be protected because dust and the like are easily clogged in the grooves. It is effective to apply a clear coating for this purpose. Examples of the clear coating film include, but are not particularly limited to, acrylic, urethane, vinyl chloride, nitrocellulose, and the like. Further, an ultraviolet absorber or the like can be added to the coating film.
[0033]
INDUSTRIAL APPLICABILITY The present invention can be suitably applied to synthetic wood obtained by molding a material containing an olefin resin and a wood filler by extrusion or the like. Examples of the olefin resin include high-density polyethylene, low-density polyethylene, polypropylene, polybutene, polyisoprene, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-propylene copolymer, ethylene-propylene-dienter. Examples thereof include a polymer and a mixture of at least two or more of these resins. Among them, polypropylene is preferable. On the other hand, as the wood filler, wood or plant fiber-derived substances such as wood flour, pulp, paper, cotton, rayon, and soup are used, and various forms such as spherical, granular, cylindrical, and fibrous are used. However, among these, wood flour is preferred. The mixing ratio of the wood-based filler is suitably 20 to 70% by weight of the total amount of the synthetic wood, and within this range, the linear expansion coefficient of the molded product can be reduced without deteriorating the moldability and impact resistance. It can be made smaller, hardly thermally deformed by a temperature change, and can impart a woody appearance. Further, as described above, the synthetic wood to which the present invention is applied is preferably one in which pigments such as titanium oxide, red iron oxide, yellow titanium oxide, and carbon black are blended and are themselves colored, but the base polymer is transparent to Since it is a translucent olefin-based resin, coloring is easy.
[0034]
【Example】
Hereinafter, an example in which the effect of the present invention has been specifically confirmed will be described. However, it is needless to say that the present invention is not limited to the following example.
[0035]
Example 1
To a synthetic wood material containing 50 parts by weight of wood flour and 50 parts by weight of polypropylene, as a pigment, titanium oxide, red iron oxide, and yellow titanium oxide are added in an adjusted mixing ratio so as to be brown, and the (Yxy) value is (14. 6, 0.46, 0.39), the extruded product prepared was partially sanded in a streak shape. When No. 80 was used as the sanding belt, the streaked areas having the Yxy values (26.3, 0.39, 0.36) formed by the sanding and the original Yxy values (14 (0.6, 0.46, 0.39). The obtained streak pattern was clearly observed visually, and had a wood-like pattern.
[0036]
Example 2
To a synthetic wood material containing 50 parts by weight of wood flour and 50 parts by weight of polypropylene, as a pigment, titanium oxide, red iron oxide, and yellow titanium oxide are added in an adjusted mixing ratio so as to be brown, and the (Yxy) value is (14. 6, 0.46, 0.39) was subjected to sanding by a sanding device equipped with a pressing roller in FIG. 2. When No. 60 was used as the sanding belt, a streaked area with a Yxy value (26.6, 0.40, 0.36) and a streaked area with a Yxy value (19.2, 0.41, 0.37) Was obtained. The obtained streak pattern was clearly observed visually, and had a wood-like pattern.
[0037]
Example 3
To a synthetic wood material containing 50 parts by weight of wood flour and 50 parts by weight of polypropylene, titanium oxide, red iron oxide, and yellow titanium oxide are added as pigments at an adjusted mixing ratio so as to be reddish brown, and the (Yxy) value is (4). .77, 0.47, 0.37) Sanding No. 40 on the entire surface of the plate-shaped extruded product prepared so that the direction of the fine grooves coincides with the longitudinal direction of the plate-shaped molded product. Sanding was performed using a belt. Thereafter, using a rotating wire brush, the grinding was performed in a streak shape such that the direction of the rotation axis of the rotating wire brush coincided with the longitudinal direction of the plate-like molded product. When the molded product after processing was illuminated from a direction perpendicular to the longitudinal direction, the portion subjected to sanding earlier had Yxy values (30.9, 0.37, 0.34). On the other hand, the portions polished with the wire brush had Yxy values (22.4, 0.39, 0.35). The two parts could be clearly distinguished.
[0038]
Example 4
To a synthetic wood material containing 50 parts by weight of wood flour and 50 parts by weight of polypropylene, titanium oxide, red iron oxide, yellow titanium oxide, and carbon black are added as pigments at an adjusted blending ratio so as to become black-brown, and the (Yxy) value is obtained. Was sanded with a fine groove using a No. 80 sanding belt on the entire surface of the plate-shaped extruded product prepared so as to be (5.65, 0.39, 0.36). Thereafter, the extruded product was moved in the longitudinal direction while pressing a steel ball having a diameter of 30 mm adjusted to 180 ° C., and the fine groove was crushed in a streak shape. The (Yxy) value of the streaks pressing the steel ball against the (Yxy) values (23.9, 0.34, 0.34) of the surface subjected to sanding is (11.4, 0.35, 0). .34). Both had a distinct color difference.
[0039]
In addition to the above Examples, the synthetic wood extruded products of various colors were patterned in the same manner as in Example 2 under various sanding conditions (changing the number of the sanding belt). Tables 1 to 4 collectively show the results of performing color measurement by Yxy on each of the obtained patterned synthetic woods according to the CIE method specified in JIS K 7105.
[Table 1]

[0040]
[Table 2]

[0041]
[Table 3]

[0042]
[Table 4]

In Tables 1 to 4, "right angle" and "parallel" indicate the case where the illumination direction is perpendicular to and parallel to the direction of the fine groove, and it can be seen that the measured value differs depending on the illumination direction. “Skin layer” is the measurement result of the unprocessed material immediately after extrusion, “# 220”, “# 150”, “# 80”, and “# 40” are the numbers of the sanding belt used, and “Melted” is fine over the entire surface. This is a result of measuring a portion where a steel ball, whose temperature has been adjusted to 180 ° C., was pressed against the surface after processing a rough groove.
From the results shown in Tables 1 to 4, if the color of the synthetic wood is a dark color system with a Y value of 20 or less, as shown in Tables 2 to 4, the Y of the sanding processed portion and the non-processed portion (skin layer) Although the value difference is large and the light and shade pattern appears clearly, as shown in Table 1, in the case of a light color system in which the Y value of the unprocessed surface is larger than 20, the difference between the Y value of the sanded processed portion and the non-processed portion is small. It can be seen that the shading pattern is not clear.
[0043]
【The invention's effect】
As described above, according to the present invention, a large number of fine grooves are formed on the surface of synthetic wood containing an olefin resin and a wood-based filler by grinding such as sanding, brushing, or the like. By partially crushing by heating and / or pressurizing to form a portion having different light scattering, a light and shade pattern of color due to a difference in light scattering is produced, and thus has a three-dimensional texture, and A patterned synthetic wood in which an arbitrary pattern such as a straight-grain pattern or a plate-grain pattern is formed as desired is obtained. Moreover, the above-described patterned synthetic wood can be manufactured with good productivity and at low cost by a simple method of simply performing the above-described processing on the formed synthetic wood.
[Brief description of the drawings]
FIG. 1 is a partial perspective view showing a basic configuration example of a sanding device used in the present invention.
FIG. 2 is a perspective view illustrating an example of a sanding belt pressing roller.
FIG. 3 is a perspective view showing another example of a sanding belt pressing roller.
FIG. 4 is a perspective view showing still another example of a sanding belt pressing roller.
FIG. 5 is a perspective view showing an example of a metal jig for crushing a fine groove.
FIG. 6 is a perspective view showing another example of a metal jig for crushing a fine groove.
FIG. 7 is a perspective view showing still another example of a metal jig for crushing a fine groove.
FIG. 8 is a perspective view showing another example of a metal jig for crushing a fine groove.
FIG. 9 is a perspective view showing still another example of a metal jig for crushing a fine groove.
[Explanation of symbols]
1 feed belt
4 Sanding belt
7, 7a, 7b, 7c Sanding belt pressing roller
9a, 9b, 9c groove
10a, 10b, 10c Protrusions (protrusions)
11a, 11b, 11c, 11d, 11e Metal jig

Claims (16)

Synthetic wood containing an olefin-based resin and a wood-based filler in an amount of 20 to 70% by weight , and the presence or absence of fine streaky grooves on the surface where the stimulus value Y of the non-scattering surface before processing is 20 or less. different portions of the light scattering is formed by, and having a light color portion provided a large number of fine grooves, the color shading pattern due to the difference in the light scattering consisting of no dark color portion having fine grooves Patterned synthetic wood. Synthetic wood containing an olefin resin and a wood-based filler in an amount of 20 to 70% by weight, and a number of streaky fine grooves are formed on the surface of the non-scattering surface before processing in which the stimulation value Y is 20 or less. There are different parts of light scattering due to the density of light and shade, and the light and shade part of dense color with fine grooves and the dark part with fine grooves are formed. Synthetic wood with a pattern characterized by having . Edges between fine fine grooves are having a minute unevenness, synthetic wood according to claim 1 or 2, characterized in that the depth or height of the irregularities is 5 to 50 microns. Has a crest minute unevenness between fine fine grooves is from 5 to 50 microns deep or height of unevenness of color portion, that the depth or height of the unevenness of the dark color portion is less than 5 microns The synthetic wood according to claim 2 , characterized in that: Pale color portions and dark color of the synthetic wood according to any one of claims 2 to 4 directions of the fine grooves are different from each other. The synthetic wood according to any one of claims 1 to 5 , wherein the synthetic wood has a clear coating film on a surface. A surface of synthetic wood containing an olefin resin and a wood-based filler in an amount of 20 to 70% by weight and having a stimulus value Y of 20 or less on a non-scattering surface before processing is partially streaked. By performing grinding processing to form a large number of fine grooves, light scattering is formed in a streak shape, and light consisting of a light- colored part with many fine grooves and a dark-colored part without fine grooves is formed. A method for producing a synthetic wood with a pattern, characterized by producing a synthetic wood having a color shading pattern due to a difference in scattering. A surface of synthetic wood containing an olefin-based resin and a wood-based filler in an amount of 20 to 70% by weight and having a stimulus value Y of 20 or less on a non-scattering surface before processing, a large number of fine streaks. By performing the grinding process to form fine grooves densely, light-colored portions with fine grooves formed densely and light-colored portions with fine grooves formed densely A method of producing a synthetic wood with a pattern, characterized by producing a synthetic wood having a light and shade pattern of color due to a difference in light scattering. In the grinding process, the degree of grinding is different between the streak-like grinding part and the other grinding part, and the light and shade pattern due to the difference of light scattering between the streak-like grinding part and the other grinding part appears. The method of claim 7 , wherein: The method according to claim 1, wherein two or more kinds of grinding processes are performed using different abrasives, a degree of grinding is varied depending on a difference in the abrasives used, and a light and shade pattern based on a difference in light scattering based on the grinding effect is produced. The method according to any one of claims 7 to 9 . Using two or more types of abrasives, grinding is performed so that the grinding direction of one abrasive is different from the grinding direction of the other abrasive. the method according to any one of claims 7 to 10, characterized in that for revealing the. After forming a large number of fine grooves uniformly on the surface by grinding, the surface is partially heated and / or pressed to crush the fine grooves in that part, forming a dark color portion. A method according to any one of claims 7 to 11 . The method according to any one of claims 7 to 11, wherein a number of fine grooves are uniformly formed on the surface by grinding, and then grinding is performed again in a streak shape. The method according to any one of claims 7 to 13, wherein the grinding is brushing sanding and / or rotary brush. The method according to any one of claims 7 to 14 , wherein the grinding is performed by sanding, and a groove corresponding to the pattern is provided on a pressing roller of the sanding belt. The method according to any one of claims 7 to 13 , wherein the grinding is performed by an electric plane machine, and a shape of a tip of a blade of the plane machine differs according to a pattern.

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