Cellulosic fiber composite resin molded article and method for producing same

Abstract

To provide a cellulosic fiber composite resin molded article having a high woody feeling and a suppressed plastic feeling.SOLUTION: The cellulosic fiber composite resin molded article is a molded article made of a cellulosic fiber composite resin containing cellulosic fibers, a base resin, and a white pigment, and has an uneven pattern on the surface.SELECTED DRAWING: Figure 10B

Description

[Technical Field]

[0001] The present disclosure relates to a cellulose fiber composite resin molded article and a method for producing the same. [Background technology]

[0002] Conventional wood-based molded products and their manufacturing methods generally involve using colorants to create uneven color or shades of color (such as marble molding) to create a wood-like texture.

[0003] However, while the above-described method can reproduce the color of the wood grain, it has the problem of difficulty in reproducing the feel, texture, and texture of the surface irregularities.

[0004] A method for reproducing the above-mentioned wood grain has been developed, as shown in Patent Document 1. The method for producing a molded article described in Patent Document 1 includes the steps of clamping a fixed mold mold and a movable mold mold having unevenness formed on the inner surfaces of the fixed mold mold and / or movable mold, injection molding a cellulose fiber composite resin, in which cellulose fiber has been added to a base resin, into the fixed mold mold inside the fixed mold and the movable mold mold to form a molded article having an uneven surface corresponding to the unevenness on the inner surface of the fixed mold or the movable mold, and, after cooling and solidifying, opening the fixed mold mold and the movable mold mold and removing the molded article from the fixed mold mold and the movable mold mold. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-65480 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the method described in Patent Document 1 requires a step and equipment for removing part of the irregularities on the surface of the molded product after it is removed. In addition, the molded product has high transmittance and weak shadows, so further improvements are desired, such as further improving the wood-like texture and suppressing the plastic-like texture.

[0007] The present disclosure is intended to solve the above-mentioned conventional problems, and aims to provide a cellulose fiber composite resin molded article that has a strong wood-like feel and a reduced plastic feel. [Means for solving the problem]

[0008] The cellulose fiber composite resin molded article according to the present disclosure is a molded article made of a cellulose fiber composite resin containing cellulose fibers, a base resin, and a white pigment, and has an uneven pattern on the surface.

[0009] The method for producing a cellulose-based fiber composite resin molded product according to the present disclosure includes the steps of: mixing a white pigment with a cellulose-based fiber resin containing cellulose-based fibers and a base resin; clamping a first mold and a second mold having an uneven surface; injecting the cellulose-based fiber composite resin mixed with the white pigment into a cavity between the first mold and the second mold to form a cellulose-based fiber composite resin molded product having an uneven shape corresponding to the unevenness on the inner surface of the second mold; and, after the cellulose-based fiber composite resin has cooled and solidified, opening the first mold and the second mold to remove the cellulose-based fiber composite resin molded product. [Effects of the Invention]

[0010] According to the cellulose fiber composite resin molded article and the manufacturing method thereof of the present disclosure, the inclusion of a white pigment can suppress the transparency of light irradiated onto the molded article. Furthermore, by imparting an uneven shape that easily creates shadows on the surface of the molded article, a sense of shadow (a three-dimensional wood grain effect) can be created. Therefore, the wood-like texture can be further enhanced and the plastic-like texture can be reduced compared to conventional methods. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a schematic diagram showing the mixing of a cellulose-based fiber composite resin and a masterbatch containing a white pigment. [Figure 2A] 1 is a schematic cross-sectional view showing one step of a method for producing a cellulose fiber composite resin molded article according to the first embodiment. [Figure 2B] 1 is a schematic cross-sectional view showing one step of a method for producing a cellulose fiber composite resin molded article according to the first embodiment. [Figure 2C] 1 is a schematic cross-sectional view showing one step of a method for producing a cellulose fiber composite resin molded article according to the first embodiment. [Figure 3A] FIG. 1 is a perspective view showing a cedar board used as an original plate for producing a concave-convex mold in an example. [Figure 3B] FIG. 1 is a plan view showing a wood grain pattern concave-convex mold produced by transferring the concave-convex patterns of a cedar board master in an example. [Figure 4] FIG. 1 is a schematic cross-sectional view showing a state in which a wood grain pattern uneven mold produced in an example is attached to the inner surface of a second mold. [Figure 5] Table 1 shows the transmittance, hiding power, and woody texture relative to the mass % of the white pigment in the masterbatch mixed with the cellulose fiber composite resin in Examples 1-1 to 1-4. [Figure 6A] FIG. 1 is a schematic front view showing the hiding power of a molded article in Example 1-1 in which the blending ratio of white pigment to the cellulose fiber composite resin is 0% by mass. [Figure 6B] FIG. 1 is a schematic diagram showing the hiding power of a molded article in Example 1-2, in which the blending ratio of a white pigment to a cellulose fiber composite resin is 0.35% by mass. [Figure 6C] FIG. 1 is a schematic diagram showing the hiding power of a molded article in Example 1-4, in which the blending ratio of white pigment to the cellulose fiber composite resin is 2.1 mass %. [Figure 7A] FIG. 1 is a schematic diagram showing the woody texture of a molded product in Example 1-1, in which the blending ratio of white pigment to the cellulose fiber composite resin is 0% by mass. [Figure 7B]FIG. 1 is a schematic diagram showing the woody texture of a molded product in Example 1-32, in which the blending ratio of white pigment to cellulose fiber composite resin is 0.35% by mass. [Figure 7C] FIG. 1 is a schematic diagram showing the woody texture of a molded product in Example 1-4, in which the blending ratio of white pigment to cellulose fiber composite resin is 2.1% by mass. [Figure 8] FIG. 1 is a schematic diagram showing an experimental system for measuring the surface brightness of molded articles in Examples 2-1-1 to 2-1-4 and 2-2-1 to 2-2-4. [Figure 9A] Table 2-1 shows the results of investigating the contrast and woody texture when the unevenness height was set to 150 μm for the mass % of the white pigment in the masterbatch mixed with the cellulose fiber composite resin in Examples 2-1-1 to 2-1-4. [Figure 9B] Table 2-2 shows the results of investigating the contrast and woody texture when the unevenness height was set to 250 μm for the mass % of the white pigment in the masterbatch mixed with the cellulose fiber composite resin in Examples 2-2-1 to 2-2-4. [Figure 10A] FIG. 2 is a schematic cross-sectional view showing a state in which a molded article with low hiding power is irradiated with light in an example. [Figure 10B] FIG. 2 is a schematic cross-sectional view showing a state in which a molded article having high hiding power is irradiated with light in an example. DETAILED DESCRIPTION OF THE INVENTION

[0012] <Background to this disclosure> The inventors have investigated the possibility of creating a wood grain pattern by providing an uneven surface, and recreating the wood texture with uneven color and shading. However, they have found that even in this case, the molded product has a high transmittance, so the shadows of the uneven surface are lost, the wood texture is lost, and a plastic feel remains.

[0013] Therefore, the inventors discovered that by incorporating a white pigment, it is possible to suppress the transparency of light irradiated onto the molded article. Furthermore, they discovered that by imparting an uneven shape that easily creates shadows to the surface of the molded article, it is possible to create a sense of shadow (a three-dimensional effect of wood grain), which led to the present disclosure.

[0014] The cellulose fiber composite resin molded article according to the first aspect is a molded article made of a cellulose fiber composite resin containing cellulose fibers, a base resin, and a white pigment, and has an uneven pattern on the surface.

[0015] The cellulose fiber composite resin molded article according to the second aspect may be the same as that of the first aspect, and may contain 40% by mass or more of cellulose fibers relative to 100% by mass of the entire cellulose fiber composite resin.

[0016] A cellulose fiber composite resin molded product according to a third aspect is the cellulose fiber composite resin molded product according to the first or second aspect, wherein the white pigment may be 0.35% by mass or more and 2.1% by mass or less relative to 100% by mass of the entire cellulose fiber composite resin.

[0017] A cellulose fiber composite resin molded article according to a fourth aspect is any one of the first to third aspects, and the cellulose fiber composite resin molded article may have a thickness of 2 mm or more and 10 mm or less.

[0018] The cellulose-based fiber composite resin molded product according to the fifth aspect is any one of the first to fourth aspects, and the cellulose-based fiber composite resin molded product may have an average transmittance of 2% or less in the wavelength range of 400 nm to 800 nm.

[0019] The cellulose fiber composite resin molded product according to the sixth aspect may be any one of the first to fifth aspects, in which the surface irregularities include protrusions of at least one shape selected from the group consisting of linear, curved, radial, circular, and angular.

[0020] A cellulosic fiber composite resin molded article according to a seventh aspect is any one of the first to sixth aspects, and the irregularities on the surface may have a height of 50 μm to 500 μm.

[0021] The cellulose fiber composite resin molded product according to the eighth aspect is any one of the first to sixth aspects, and the surface irregularities may be formed into a wood grain pattern by combining at least two or more convex portions having at least one shape selected from the group consisting of linear, curved, radial, circular, and angular.

[0022] A method for producing a cellulose fiber composite resin molded article according to a ninth aspect includes the steps of: mixing a white pigment into a cellulose fiber composite resin containing cellulose fibers and a base resin; a step of clamping a first mold and a second mold having an uneven inner surface; a step of injecting a cellulose fiber composite resin mixed with a white pigment into a cavity between the first mold and the second mold to form a cellulose fiber composite resin molded product having a surface with an uneven shape corresponding to the unevenness of the inner surface of the second mold; and a step of, after the cellulose fiber composite resin has cooled and solidified, opening the first mold and the second mold to remove the cellulose fiber composite resin molded article.

[0023] A tenth aspect of the method for producing a cellulose-based fiber composite resin molded article is the same as the ninth aspect, and in the step of mixing a white pigment into the cellulose-based fiber composite resin, pellets of the cellulose-based fiber composite resin may be mixed with masterbatch pellets containing the white pigment and a resin.

[0024] Hereinafter, a cellulose fiber composite resin molded article and a method for producing the same according to an embodiment will be described.

[0025] (Embodiment 1) <Method of manufacturing a cellulose fiber composite resin molded product> Fig. 1 is a schematic diagram showing a molding resin and a colorant containing a white pigment used in a cellulose fiber composite resin molded article according to embodiment 1. Fig. 2A to Fig. 2C are schematic cross-sectional views showing each step of a method for producing a cellulose fiber composite resin molded article according to embodiment 1. The manufacturing method of the molded product according to the first embodiment includes the steps of mixing a white pigment 102 into a cellulose-based fiber composite resin 101, clamping a first mold (fixed mold) 103 and a second mold (movable mold) 104, injection-molding the cellulose-based fiber composite resin 101 mixed with the white pigment 102 into the cavity between the first mold (fixed mold) 103 and the second mold (movable mold) 104 to form a molded product, and, after the cellulose-based fiber composite resin has cooled and solidified, opening the first mold (fixed mold) 103 and the second mold (movable mold) 104 to remove the cellulose-based fiber composite resin molded product 108.

[0026] Specifically, the method for producing the cellulose fiber composite resin molded article according to the first embodiment is carried out as follows. (1) First, a cellulose-based fiber composite resin 101 is mixed with a colorant 102 containing a white pigment (FIG. 1). A masterbatch containing a white pigment may be used as the colorant 102 containing a white pigment. There is no need to stock a large amount of pellets of the cellulose-based fiber composite resin 101 containing a predetermined concentration of white pigment in advance. The pellets of the cellulose-based fiber composite resin 101 can be mixed with a required amount of masterbatch pellets containing a high concentration of white pigment to produce a cellulose-based fiber composite resin 101 containing a predetermined concentration of white pigment. (2) Next, a second mold (movable mold) 104 having an inner surface with irregularities 106 and a first mold (fixed mold) 103 are clamped together (FIG. 2A). The first mold (fixed mold) 103 is provided with a sprue 105 for injecting a cellulose-based fiber composite resin. (3) Next, a composite resin, which is a cellulose fiber composite resin made by adding cellulose fiber to a base resin and blending a colorant containing a white pigment, is injected from a sprue 105 into the internal cavities of the first mold (fixed mold) 103 and the second mold (movable mold) 104 (FIG. 2B). This results in the formation of a cellulose fiber composite resin molded product 107, which has an uneven shape corresponding to the unevenness 106 on the inner surface of the second mold (movable mold). (4) Furthermore, after the cellulose-based fiber composite resin molded product 107 is cooled and solidified in the mold, the first mold (fixed mold) 103 and the second mold (movable mold) 104 are opened to remove the cellulose-based fiber composite resin molded product 108 (Figure 2C). As a result of the above, a cellulose fiber composite resin molded article containing a white pigment and having an uneven pattern on the surface is obtained.

[0027] The cellulose fiber composite resin molded article obtained by this manufacturing method for the cellulose fiber composite resin molded article contains a white pigment, which can suppress the transparency of light irradiated onto the cellulose fiber composite resin molded article. Furthermore, the cellulose fiber composite resin molded article can express a sense of shadow (a three-dimensional wood grain effect) by imparting an uneven shape to the surface of the molded article that easily expresses shadows. Therefore, this cellulose fiber composite resin molded product can have a more enhanced wood feel and a less plastic feel than conventional wood molded products.

[0028] <Cellulose-based fiber composite resin> The cellulose fiber composite resin used in the first embodiment includes a base resin as a matrix and cellulose fibers. The cellulose fiber composite resin used as the injection resin contains 40% by mass or more of cellulose fibers with an average aspect ratio (fiber length / fiber diameter) of 5 or more relative to the base resin as a matrix. The cellulose fiber composite resin may be prepared in the form of pellets. The type of cellulose-based fiber is not particularly limited, and can be any material from which cellulose-based fibers can be extracted, such as coniferous trees, broad-leaved trees, or bamboo. Furthermore, the cellulose-based fiber may have an aspect ratio of 5 or more, and the diameter can be freely selected within a range from the order of μm to the order of nm, without any particular limitation. To reproduce a wide range of colors, the cellulose-based fiber is preferably bleached and lignin-removed, and preferably pulp, which is a raw material for paper, may be used. In this embodiment, the cellulose-based fiber used is, for example, a cellulose-based fiber composite resin obtained by pre-pulverizing bleached coniferous pulp extracted from wood to an average diameter of 50 μm and an average length of 300 μm, and then mixing and kneading the powdered pulp with polypropylene, a base resin serving as a matrix, in a kneader.

[0029] The kneader temperature may be set to, for example, 190°C, and kneading may be performed at a low temperature to minimize discoloration (browning) of the pulp. Furthermore, the shear force generated in the kneader causes the fibers to defibrate (loosen the fibers and reduce their diameter), resulting in a higher fiber aspect ratio (fiber length / fiber diameter) in the pellets of the cellulose fiber composite resin after kneading compared to the powdered pulp before kneading. The pellets obtained by the above-described manufacturing method can be produced while remaining white (pulp color) because the cellulose fibers do not discolor due to the effects of heat. Although polypropylene (PP) was used as the base resin for compounding the cellulosic fibers, there is no limitation thereto. Any resin that can be compounded into a resin without carbonizing the cellulosic fibers during the pellet production stage may be used.

[0030] <White pigment (colorant containing white pigment)> The colorant containing a white pigment used in the first embodiment contains a base resin and a white pigment. For example, a masterbatch may be used. The masterbatch is produced by mixing a base resin material and a white pigment, feeding the mixture into an extruder, melting, kneading, extruding, cooling, solidifying, and cutting the mixture into pellets. Examples of the white pigment that can be used include titanium oxide, zinc oxide, calcium carbonate, etc. Furthermore, the ink may contain a colorant other than the white pigment. This pellet-like masterbatch is mixed with pellets of injection molding resin and melted in the heating barrel of a molding machine to color the mixture. The resin of the masterbatch may be the same type as the base resin used in injection molding. In the first embodiment, a cellulose fiber composite resin with polypropylene as the base resin was used as the injection molding resin, and therefore polypropylene was also used as the base resin of the masterbatch. The method for coloring the injection molding material is not limited to the use of a masterbatch, and other methods such as colored pellets, dry colors, and liquid colors can also be used. However, the coloring method does not need to be limited as long as the desired function can be exhibited.

[0031] <Wood grain pattern on the inner surface of the second mold (movable mold)> The convex portions provided on the inner surface of the second mold (movable mold) are transferred to become concave portions on the molded product side. On the other hand, the concave portions provided on the inner surface of the second mold (movable mold) are transferred to become convex portions on the molded product side. By considering the shape transfer as described above and arbitrarily setting the size, arrangement, and shape of the convex and concave portions, it is possible to obtain a wood grain pattern design. The height of the convex and concave portions is preferably 50 μm to 500 μm, and in order to express a sense of shadow (a three-dimensional effect of the wood grain) on the surface of the molded product and create a realistic wood grain pattern, the height of the convex and concave portions is more preferably 200 μm to 300 μm. In this embodiment, in order to produce a more realistic wood grain pattern, a mold is made by transferring the original cedar board and placed on the second mold (movable mold) as a method for producing the wood grain pattern, but this is not limited to this. Other methods for producing wood grain patterns include etching and laser processing, but the method does not need to be limited as long as the desired wood grain pattern can be produced.

[0032] <Cellulose-based fiber composite resin molded products (injection molded products)> The cellulose fiber composite resin molded article (injection molded article) according to the first embodiment is a molded article made of a cellulose fiber composite resin containing cellulose fibers, a base resin, and a white pigment. The cellulose fiber composite resin molded article has a pattern of irregularities on its surface. The cellulose fiber composite resin molded article may contain 40% by mass or more of cellulose fibers relative to 100% by mass of the entire cellulose fiber composite resin. The white pigment may be 0.35% by mass or more and 2.1% by mass or less relative to 100% by mass of the entire cellulose fiber composite resin. The cellulose fiber composite resin molded article may have a thickness of 2 mm or more and 10 mm or less. The cellulose fiber composite resin molded article may have an average transmittance of 2% or less in a wavelength range from 400 nm to 800 nm. The cellulose fiber composite resin molded article may have surface irregularities including protrusions of at least one shape selected from the group consisting of linear, curved, radial, circular, and angular. The surface irregularities may have a height of 50 μm to 500 μm. The unevenness on the surface may be a wood grain pattern formed by combining at least two or more projections having at least one shape selected from the group consisting of linear, curved, radial, circular and angular. This cellulose fiber composite resin molded article contains a predetermined amount of white pigment, which prevents light from passing through the surface of the molded article. Furthermore, the unevenness that represents the wood grain pattern creates shadows and shades, which gives the article a three-dimensional appearance.

[0033] (Example) Fig. 3-A is a perspective view showing a master cedar board 109 used to make a grained mold with a wood grain pattern according to the embodiment. Fig. 3-B is a plan view showing a concave-convex mold 110 made by transferring the master cedar board. In this embodiment, a concave-convex mold 111 having a surface concave-convex 106 was placed on the inner surface of a second mold (movable mold) 104, and an injection molding experiment was carried out by injecting a cellulose fiber composite resin mixed with a white pigment from a sprue 105 (Fig. 4). In the examples, a cellulose fiber composite resin containing a base resin as the matrix of the cellulose fiber composite resin and 55% by mass of cellulose fiber was used. For comparison, experiments were also conducted under different conditions, with the white pigment content of the masterbatch mixed into the cellulose fiber composite resin varied. The white pigment mixing conditions were as follows: (1) to (4). (1) 0% by mass (2) 0.35% by mass (3) 0.7% by mass (4) 2.1% by mass The content is expressed as 100% by mass of the entire cellulose fiber composite resin including the white pigment.

[0034] (Examples 1-1 to 1-4) FIG. 5 is Table 1 showing the evaluation results of Examples 1-1 to 1-4 in which the mixing ratio of the white pigment was compared using transmittance and appearance (hiding ability (transparency), woody texture) of the molded product as evaluation items. 6A to 6C are schematic diagrams showing the hiding power of cellulose fiber composite resin molded articles 113, 114, and 115 containing 0 mass% (Example 1-1), 0.35 mass% (Example 1-2), and 2.1 mass% (Example 1-4) of white pigment, respectively. Specifically, when illuminated from the viewing side, the figures show whether light from the viewing side passes through the molded article to reveal a structure 112 located behind it. Example 1-1 in FIG. 6A has poor hiding power, allowing the structure behind the molded article to be seen through. 7A to 7C are schematic diagrams showing the woody texture on the surface of cellulose fiber composite resin molded articles containing white pigment at blending rates of 0 mass% (Example 1-1), 0.35 mass% (Example 1-2), and 2.1 mass% (Example 1-4), respectively. Example 1-1 in Fig. 7A does not have a woody texture. 5, it can be seen that a woody texture is expressed when the mixing ratio of the white pigment in the masterbatch mixed with the cellulose fiber composite resin is 0.35 mass % or more. The cellulose fiber composite resin molded products of Examples 1-1 to 1-4 had a thickness of 2 mm.

[0035] (Examples 2-1-1 to 2-1-4 and Examples 2-2-1 to 2-2-4) Next, as shown in Fig. 8, a two-dimensional color luminance meter (CA-2500: manufactured by Konica Minolta) 119 was used to measure the surface luminance of the molded article 120 under indoor lighting. In the evaluation of the surface luminance of the molded article, the following index was used to compare and evaluate the brightness of the surface of the molded article 120: Contrast = (maximum brightness value) / (minimum brightness value) We then conducted a comparative evaluation of the contrast and wood texture.

[0036] Figure 9A is Table 2-1 showing the results of investigating the contrast and woody texture when the unevenness height was set to 150 μm for the mass percentage of the white pigment in the masterbatch mixed with the cellulose fiber composite resin in Examples 2-1-1 to 2-1-4. Figure 9B is Table 2-2 showing the results of investigating the contrast and woody texture when the unevenness height was set to 250 μm for the mass percentage of the white pigment in the masterbatch mixed with the cellulose fiber composite resin in Examples 2-2-1 to 2-2-4. As shown in Table 2-1 in Figure 9A, when the unevenness height is 150 μm, the difference in contrast due to the mixing ratio of the white pigment in the masterbatch is small. On the other hand, as shown in Table 2-2 in Figure 9B, when the unevenness height is 250 μm, the contrast increases as the mixing ratio of the white pigment in the masterbatch increases.

[0037] <Summary of Examples> 10A is a schematic cross-sectional view showing a state in which light is irradiated onto a molded product 122 with low hiding power. When the molded product has low hiding power, irradiated light 121 passes through the molded product 123, eliminating the shadows created by the uneven shape, impairing the wood-like texture and leaving a plastic-like feel.

[0038] 10B is a schematic cross-sectional view showing a state in which light is irradiated onto a molded article 124 with high concealability. The molded article has high concealability, which increases the amount of reflected light 125 from the uneven surface. Furthermore, the uneven shape creates two dark areas: shadows 126, which are dark areas created by the uneven portions themselves as the convex portions block light, and shadows 127, which are dark areas created by the shape of the convex portions as the convex portions block light. These shadows 126 and shadows 127 increase the contrast (brightness / darkness ratio) within the surface of the molded article, creating a sense of shadow (the three-dimensional feel of wood grain). As described above, the molded product has high hiding power and the surface irregularities of the molded product are appropriately high, which gives the product a three-dimensional wood grain appearance and reduces the plastic feel, resulting in a molded product with a high wood-like texture. [Explanation of symbols]

[0039] 101 Cellulose-based fiber composite resin 102 White pigmented colorants 103 First mold (fixed mold) 104 Second mold (movable mold) 105 Sprue (injection molding nozzle) 106 Surface unevenness 107 Molded objects 108 Molded products 109 Cedar Board 110 Uneven type-1 111 Uneven type-2 112 Structures 113 Front view of a cellulose fiber composite resin molded product with a white pigment content of 0% by mass 114 Front view of a cellulose fiber composite resin molded product with a white pigment content of 0.35% by mass 115 Front view of a cellulose fiber composite resin molded product with a white pigment content of 2.1% by mass 116 Oblique view of a cellulose fiber composite resin molding with a white pigment content of 0% by mass 117 Oblique view of a cellulose fiber composite resin molding with a white pigment content of 0.35% by mass 118 Oblique view of a cellulose fiber composite resin molding with a white pigment content of 2.1% by mass 119 2D Colorimeter 120 Molded products 121 Irradiation Light 122 Molded products with low hiding power 123 Transmitted light 124 Highly opaque molded products 125 Reflected light 126 Yin 127 Shadow

Claims

1. A molded article made of a cellulose fiber composite resin containing cellulose fibers, a base resin, and a white pigment, A cellulose fiber composite resin molded product with an uneven surface pattern.

2. The cellulose fiber composite resin contains 40% by mass or more of cellulose fibers relative to 100% by mass of the entire resin. The cellulose fiber composite resin molded article according to claim 1.

3. The cellulose-based fiber composite resin molded product according to claim 1 or 2, wherein the white pigment is present in an amount of 0.35% by mass or more and 2.1% by mass or less, relative to 100% by mass of the entire cellulose-based fiber composite resin.

4. The cellulose fiber composite resin molded product according to claim 1 or 2, wherein the cellulose fiber composite resin molded product has a thickness of 2 mm or more and 10 mm or less.

5. The cellulose fiber composite resin molded product according to claim 1 or 2, wherein the cellulose fiber composite resin molded product has an average transmittance of 2% or less in a wavelength range of 400 nm to 800 nm.

6. The cellulose fiber composite resin molded product according to claim 1 or 2, wherein the surface irregularities include protrusions having at least one shape selected from the group consisting of linear, curved, radial, circular, and angular.

7. The cellulose fiber composite resin molded product according to claim 1 or 2, wherein the height of the surface irregularities is 50 μm to 500 μm.

8. 3. The cellulose fiber composite resin molded product according to claim 1, wherein the surface irregularities are formed by combining at least two or more convex portions having at least one shape selected from the group consisting of linear, curved, radial, circular, and angular shapes to form a wood grain pattern.

9. a step of mixing a white pigment with a cellulose fiber composite resin containing cellulose fibers and a base resin; a step of clamping a first mold and a second mold having an uneven inner surface; a step of injecting a cellulose fiber composite resin mixed with a white pigment into a cavity between the first mold and the second mold to form a cellulose fiber composite resin molded product having a surface with an uneven shape corresponding to the unevenness of the inner surface of the second mold; After the cellulose-based fiber composite resin has cooled and solidified, the first mold and the second mold are opened to remove the cellulose-based fiber composite resin molded article. A method for producing a cellulose fiber composite resin molded article, comprising:

10. 10. The method for producing a cellulose fiber composite resin molded article according to claim 9, wherein in the step of mixing the white pigment with the cellulose fiber composite resin, pellets of the cellulose fiber composite resin are mixed with masterbatch pellets containing the white pigment and a resin.

Images