JP7618964B2 - Wood grain decorative materials and building materials - Google Patents

Description

The present invention relates to wood grain decorative materials and building materials.

Conventionally, decorative materials are laminated on adherends to impart design to the surfaces of various articles. For example, wall covering materials used on the walls of buildings, floor decorative materials used on floors, and the surfaces of furniture and the like are laminated with sheet-shaped decorative materials.
As a design given to such decorative materials, a grain pattern that imitates natural wood is often used. In general, it is considered that the closer the grain pattern of a decorative material is to a natural wood board in terms of both appearance (sight) and touch (hand feeling), the better. Therefore, in decorative materials having a grain pattern, various efforts have been made to make the design and uneven shape of the material as close as possible to a natural wood board in terms of appearance and touch.

Since annual rings and vessel grooves in natural wood boards are unique to wood, faithful reproduction of these in decorative materials with wood grain patterns is considered important in order to obtain decorative materials that are closer to natural wood boards. For example, efforts have been made to form vessel grooves, which are recesses in natural wood boards, as recesses in decorative materials with wood grain patterns (for example, Patent Document 1).
In Patent Document 1, a wood grain pattern is gravure printed, and a resin layer for forming a second surface protective layer is gravure printed in a manner that is synchronized with the portion other than the vessel grooves, thereby forming recesses relative to the vessel grooves of the wood grain pattern. This form imitates an actual natural wood board to a certain degree of fidelity, and therefore achieves a relatively good appearance and wood grain feel, i.e., a tactile sensation.

JP 2008-087269 A

However, due to the increasing demands placed on the design of decorative materials in recent years, the following points, which were not previously of much concern, have now become problematic in wood grain patterns having vascular grooves:
First, the uneven texture is weak. With regard to the uneven texture caused by the concave shape of the duct grooves, there is a problem that the uneven texture of the decorative material having a wood grain pattern is felt to be lower (weaker) than the uneven texture of a natural wooden board.

Next, the sharpness of the vessel groove portion is inferior in appearance (appearance). In the appearance of the vessel groove portion of a decorative material having a wood grain pattern, the vessel groove portion has a problem that, compared to the sharpness of a natural wooden board, the vessel groove portion has a blurred appearance lacking in sharpness because the gentle slope of the outline of the recess formed in the vessel groove portion makes the portion appear whitish due to reflection.
Another problem is that it is difficult to clean. The narrow duct grooves in natural wood boards are also reproduced as narrow recesses in decorative materials with a wood grain pattern, making it difficult to remove dirt that has entered the recesses. This problem is thought to occur in natural wood boards as well, but since it is a decorative material, it is preferable that it is easy to clean.

In view of the above, the object of the present invention is to provide a decorative material having a wood grain pattern including vascular groove portions, which has an appearance and feel closer to that of natural wood boards, and a building material in which the wood grain decorative material is attached to an adherend.

The present invention is a wood grain decorative material having a substrate, a pattern layer, and duct-like ridges, the wood grain decorative material including duct-like ridges on at least a portion of its surface, the pattern layer having a wood grain pattern including duct groove portions, and the duct-like ridges corresponding to the duct groove portions of the wood grain pattern.

In the above wood grain decorative material, if the width W of the ductile ridge portion in a cross-sectional view perpendicular to its extension direction is W, W may monotonically decrease with increasing distance from the base material.

In the above wood grain decorative material, the height H of the tubular ridge portion may be 10 μm≦H≦50 μm.

In the above wood grain decorative material, the surface of the ductile ridges may be rougher than the surface of the portion of the wood grain decorative material where the ductile ridges are not present.

In the above-mentioned wood grain decorative material, the surface of the wood grain decorative material in the portion where no duct-like ridges are present may be rougher than the surface of the duct-like ridges.

In the above wood grain decorative material, the duct-like ridges do not have to be in sync with the duct grooves of the wood grain pattern.

In the above wood grain decorative material, the duct-like ridges may be in harmony with the duct grooves of the wood grain pattern.

In the above wood grain decorative material, the duct-like ridges may be embossed.

The present invention is a building material in which the above-mentioned wood grain decorative material is attached to an adherend.

The present invention provides a decorative material having a wood grain pattern including vascular groove portions, a wood grain decorative material having an appearance and feel closer to that of natural wood boards, and a building material obtained by attaching the wood grain decorative material to an adherend.

FIG. 1 is a cross-sectional perspective view showing an outline of a wood grain decorative material according to an embodiment of the present invention; FIG. 2(a) is a schematic cross-sectional view illustrating the width and height of a duct-like ridge portion of the wood grain decorative material according to the present invention, and FIG. 2(b) is a diagram illustrating monotonically decreasing FIG. 1 is a schematic cross-sectional view illustrating an example of the layer structure of a wood grain decorative material according to the present invention. FIG. 1 is a schematic cross-sectional view illustrating a method for producing a wood grain decorative material according to an embodiment of the present invention. FIG. 1 is a cross-sectional perspective view showing an outline of a building material according to the present invention.

[Woodgrain decorative material]
The wood grain decorative material according to the present invention will be described below with reference to the drawings. Note that the drawings shown below are schematic views, and the size, shape, thickness, gaps, decoration, etc. of each part are appropriately exaggerated and simplified to facilitate understanding. Also, configurations that are not directly related to the description are appropriately omitted. Note that in the drawings below, the same parts are given the same reference numerals, and some detailed descriptions may be omitted.

In the following description, specific numerical values, shapes, materials, etc. are given, but these can be changed as appropriate.
In this specification, the terms plate, sheet, film, etc. are used, and in general usage, they are used in the order of thickness: plate, sheet, film, etc., and this specification follows that order. However, since such distinction in usage has no technical meaning, even if these terms are appropriately replaced, the essence of the present invention and the interpretation of the claims are unchanged.

As described above, the wood grain decorative material of the present invention is used on the surfaces of building walls, floors, furniture, etc., to provide a decorative effect. For this reason, the wood grain decorative material of the present invention usually has only one side that is observed. Of the two sides of the wood grain decorative material of the present invention, the side that is usually observed is called the front side, and the opposite side is called the back side. In addition, in each of the drawings, including cross sections, the front side is shown as the upper side, and the back side is shown as the lower side.

(Embodiment)
FIG. 1 is a cross-sectional perspective view showing an outline of a wood grain decorative material 10 according to an embodiment of the present invention.
The wood grain decorative material 10 according to the embodiment has a substrate 1, a picture pattern layer 3, and duct-like ridges 2 on at least a portion of the surface of the wood grain decorative material 10. The picture pattern layer 3 has a wood grain pattern including duct groove portions, and the duct-like ridges 2 correspond to the duct groove portions of the wood grain pattern.
The wood grain decorative material 10 may include any layer other than those described above. In the embodiment shown in Fig. 1, the wood grain decorative material 10 further includes a transparent resin layer 4, and in the embodiment shown in Fig. 1, the substrate 1, the picture pattern layer 3, and the transparent resin layer 4 are laminated in this order from the bottom. In the embodiment shown in Fig. 1, the transparent resin layer 4, which is the outermost layer, has a surface that is deformed into an uneven shape so that it has an uneven shape that is visually and tactilely perceived as a vessel groove pattern. The convex parts of the uneven shape correspond to the vessel-like convex streak part 2, and the parts that are not the convex parts (relative concave parts) correspond to the parts 2s of the surface of the wood grain decorative material where no vessel-like convex streak part exists.

In the embodiment shown in Fig. 1, the duct-like ridges 2 are deformed by the transparent resin layer 4, but are not limited thereto. As will be described later in the modified form (Fig. 3), the wood grain decorative material 10 according to the present invention can have various layer configurations, but in each form, the duct-like ridges 2 have an uneven shape that is visually and tactilely perceived as a duct groove pattern on the surface of the wood grain decorative material 10. Therefore, when the base material 1 is the outermost layer, the surface of the base material 1 is deformed into an uneven shape to form the duct-like ridges 2 (Figs. 3(d) and 3(e)). The same applies to the case where another layer is the outermost layer.
When the outermost layer is a thin layer such as the picture pattern layer 3 or the surface protective layer, it is not possible to deform only the surface of the thin layer (the picture pattern layer 3 or the surface protective layer) into an uneven shape to form the duct-like ridge portion 2. In such a case, the surface of the layer below the thin layer (substrate 1 in Fig. 3(d)) is deformed into an uneven shape, and the thin layer above it is made to follow the uneven shape of the lower layer (substrate 1), so that the lower layer (substrate 1) and the thin layer form the duct-like ridge portion 2 together (Fig. 3(d)).

Here, the xylem groove refers to the groove-like depression that is observed when a xylem, which is a pathway for moisture in the xylem of a plant, is cut longitudinally and the xylem is observed to have a groove-like depression running longitudinally on the cut surface.
Furthermore, the phrase "the duct-like ridges 2 correspond to the duct groove portions of the wood grain pattern" means that an observer of the wood grain decorative material 10 according to the present invention visually and tactilely perceives the duct-like ridges 2 as duct grooves in the wood grain pattern. In this case, it is considered that an observer of the wood grain decorative material 10 having a wood grain pattern including duct groove portions is very unlikely to feel a sense of incongruity compared to a natural wood board. As will be explained in detail later, this is not limited to the case where the duct-like ridges 2 are in phase with the duct groove portions of the wood grain pattern in plan view.
As described above, such a wood grain decorative material 10 can be made to have an appearance and feel closer to that of a natural wooden board.

<Substrate>
The material of the substrate 1 is not particularly limited, and may be a fibrous sheet, a plastic substrate, a metal substrate, a wood substrate, or the like.
As the fibrous sheet, known fibrous sheets such as thin paper, reinforced paper, impregnated paper, titanium paper, coated paper, corrugated cardboard, linter paper, kraft paper, and fine paper can be used. Specific examples include general wallpaper paper (a pulp-based sheet sized with a known sizing agent); flame-retardant paper (a pulp-based sheet treated with a flame retardant such as guanidine sulfamate or guanidine phosphate); inorganic paper containing inorganic additives such as aluminum hydroxide or magnesium hydroxide; fine paper; thin paper; and fiber-mixed paper (a paper made by mixing pulp and synthetic fibers). The fibrous sheet also includes those classified as nonwoven fabrics.

As the plastic substrate, various plastic sheets, films, etc., such as polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, acrylonitrile butadiene styrene, polyvinyl chloride, etc. can be used. The plastic substrate may be colored or uncolored. As the metal substrate, a product can be made by applying an undercoat of a coloring agent to a steel plate, aluminum, stainless steel, etc. As the wood-based substrate, plywood, particle board, medium density fiberboard, etc. can be used.
The basis weight of the substrate 1 is not critical, but is preferably about 20 to 300 g/m ² , more preferably about 50 to 300 g/m ² , and even more preferably about 50 to 130 g/m ² .

<Pattern layer>
The picture pattern layer 3, together with the duct-like ridge portions 2, imparts design to the wood grain decorative material 10. The picture pattern associated with the picture pattern layer 3 in the wood grain decorative material 10 of the present invention has a wood grain pattern including duct groove portions. There are no particular limitations on the wood grain pattern as long as it includes duct groove portions, and it may be selected according to demand, etc. In the present invention, various effects are achieved by including duct groove portions in the wood grain pattern.

The picture pattern layer 3 can be formed, for example, by printing a picture pattern. Examples of printing methods include gravure printing, flexographic printing, silk screen printing, offset printing, etc. As the printing ink, a printing ink containing a colorant, a binder resin, and a solvent can be used. These inks may be publicly known or commercially available.

The colorant is not particularly limited, and known inorganic or organic pigments can be used. Examples of inorganic pigments include titanium oxide, zinc oxide, carbon black, black iron oxide, yellow iron oxide, yellow lead, molybdate orange, cadmium yellow, nickel titanium yellow, chrome titanium yellow, iron oxide (red oxide), cadmium red, ultramarine, Prussian blue, cobalt blue, chromium oxide, cobalt green, aluminum powder, bronze powder, titanium mica, and zinc sulfide. Examples of organic pigments include aniline black, perylene black, azo-based pigments (azo lake, insoluble azo, condensed azo), polycyclic pigments (isoindolinone, isoindoline, quinophthalone, perinone, flavanthrone, anthrapyrimidine, anthraquinone, quinacridone, perylene, diketopyrrolopyrrole, dibromoanzanthrone, dioxazine, thioindigo, phthalocyanine, indanthrone, and halogenated phthalocyanine. The pigment content is preferably about 10 to 100 parts by mass, and more preferably about 15 to 50 parts by mass, per 100 parts by mass of the resin component.

The binder resin can be set according to the type of substrate 1. Examples include acrylic resins, styrene resins, polyester resins, urethane resins, chlorinated polyolefin resins, vinyl chloride-vinyl acetate copolymer resins, polyvinyl butyral resins, alkyd resins, petroleum resins, ketone resins, epoxy resins, melamine resins, fluorine resins, silicone resins, cellulose derivatives, rubber resins, etc.

Examples of the solvent (or dispersion medium) include petroleum-based organic solvents such as hexane, heptane, octane, toluene, xylene, ethylbenzene, cyclohexane, and methylcyclohexane; ester-based organic solvents such as ethyl acetate, butyl acetate, 2-methoxyethyl acetate, and 2-ethoxyethyl acetate; alcohol-based organic solvents such as methyl alcohol, ethyl alcohol, normal propyl alcohol, isopropyl alcohol, isobutyl alcohol, ethylene glycol, and propylene glycol; ketone-based organic solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; ether-based organic solvents such as diethyl ether, dioxane, and tetrahydrofuran; chlorine-based organic solvents such as dichloromethane, carbon tetrachloride, trichloroethylene, and tetrachloroethylene; and water. These solvents (or dispersion media) can be used alone or in a mixture.
The thickness of the picture pattern layer 3 varies depending on the type of picture pattern, but is generally preferably about 0.1 to 20 μm.

<Transparent resin layer>
In the wood grain decorative material 10 according to the embodiment, a transparent resin layer 4 is formed on the upper surface side of the picture pattern layer 3. The transparent resin layer 4 is appropriately formed or deformed to form the duct-like ridge portions 2. In the present invention, the transparent resin layer 4 is not an essential component and may not be present. When the transparent resin layer 4 is not present, the duct-like ridge portions 2 are formed by deformation of the substrate 1.

The transparent resin layer 4 is not particularly limited as long as it is transparent, and may be colorless and transparent, colored and transparent, translucent, etc. Examples of resins constituting the transparent resin layer 4 include phenolic resins, urea resins, diallyl phthalate, melamine resins, guanamine resins, unsaturated polyester resins, polyurethane resins, epoxy resins, aminoalkyd resins, melamine-urea co-condensates, silicon resins, polysiloxanes, polyethylene terephthalate, polybutylene terephthalate, polyamides, polyethylene, polypropylene, ethylene-vinyl acetate copolymers, ethylene-acrylic acid copolymers, ethylene-acrylic acid ester copolymers, ionomers, polymethylpentene, acrylic acid esters, methacrylic acid esters, polycarbonates, cellulose triacetates, etc. Also, ionizing radiation curable resins may be used. These resins may be used alone or in combination of two or more.

To adjust the surface roughness of the transparent resin layer 4, fine particles of silica, alumina, kaolin, or the like, or beads such as urethane beads or acrylic beads may be added.
The transparent resin layer 4 may be colored as long as it has transparency, but it is preferable not to incorporate a colorant therein.
The thickness of the transparent resin layer 4 in the portion 2s of the surface of the wood grain decorative material 10 where no duct-like convex rib portion is present is typically about 5 to 30 μm, but may exceed the above range depending on the application of the wood grain decorative material 10, etc.

<Conduit-like convex strip>
As described above, the duct-like ridges 2 are typically formed by deforming the surface of the transparent resin layer 4, the substrate 1, or other layers into a convex shape, forming relative convexities on the surface of the wood grain decorative material 10. The portions of the surface of the wood grain decorative material 10 that are not duct-like ridges 2 are referred to as portions 2s where no duct-like ridges are present. The duct-like ridges 2 are convexities on the surface of the wood grain decorative material 10 that are preferably formed by mechanical processing such as embossing. The duct-like ridges 2 are preferably embossed, and play an important role in allowing people to perceive the duct grooves both in terms of touch and appearance.

The duct-like ridge portion 2 is formed such that, when the width of the duct-like ridge portion 2 in a cross-sectional view perpendicular to the extending direction thereof is taken as W, W monotonically decreases with increasing distance from the base material 1 .
Fig. 2(a) is a schematic cross-sectional view of the ductile ridge 2 cut along a plane perpendicular to its extending direction. In Fig. 2(a), the width W of the ductile ridge 2 in the cross-sectional view perpendicular to its extending direction monotonically decreases with increasing distance from the substrate 1, i.e., as h shown in the figure increases (moving upward in the figure). "Monotonically decreasing" refers to a relationship in which W always decreases as h increases, as shown in Fig. 2(b).

The height H of the conduit-like ridges 2 is preferably in the range of 10 μm≦H≦50 μm. Here, the height H of the conduit-like ridges 2 is the height from the portion 2s where no conduit-like ridges exist to the tip of the conduit-like ridges 2 in a cross-sectional view perpendicular to the extension direction of the conduit-like ridges 2, and is the height shown by H in FIG. 2(a). The conduit-like ridges 2 of the wood grain decorative material 10 of the present invention are formed by mechanical processing such as embossing, rather than by laminating a new layer as in raised printing, and can easily be made 10 μm≦H≦50 μm.

As described above, the duct-like ridges 2 are formed so that the width W monotonically decreases with increasing distance from the substrate 1, and the height H is preferably in the range of 10 μm≦H≦50 μm. A duct-like ridge 2 having such a shape and dimensions can be easily formed by machining, preferably embossing. Furthermore, since the wood grain decorative material 10 of the present invention has duct-like ridges 2 having such a shape and dimensions, it is possible to make the appearance and feel closer to that of a natural wood board than conventional decorative materials in which the duct groove portions are formed as relative recesses, and to produce a decorative material that feels less unnatural.

The shape of the conduit-like ridge 2 is a shape that resembles the concave shape of the conduit groove in natural wood, but the dimensions do not need to conform to the conduit groove in natural wood. Rather, the dimensions should be actively adjusted so that an appearance and feel similar to that of a natural wood board can be obtained. As described above, the width W of the conduit-like ridge 2 decreases monotonically as it moves away from the substrate 1 (as it moves up in height), and the conduit-like ridge 2 is designed to be thinner at both ends and wider in the middle in the extension direction. The actual dimensions of the width W of the conduit-like ridge 2 are illustrated below, but here the width W of the conduit-like ridge 2 is the width W at the middle part in the extension direction of the conduit-like ridge 2, the width W at 1/3 height of H in the height direction h in the cross-sectional view perpendicular to the extension direction, and is the dimension of the part shown by W in FIG. 2(a). Such W is usually in the range of 70 μm≦W≦400 μm, and preferably in the range of 100 μm≦W≦300 μm. The wood grain decorative material 10 formed with the duct-like ridges 2 having such H and W can have an appearance and feel closer to that of a natural wood board, making it a decorative material that feels less unnatural.

Incidentally, with regard to the concave shape of the vessel groove in natural wood, the width Wn of the concave shape defined similarly to that above (with the concave and convex sides reversed) is usually about 100 μm≦Wn≦300 μm, and the depth Dn is about 100 μm≦Dn≦300 μm.
If we compare the convex shape of the duct-like ridge portion 2 of the wood grain decorative material 10 of the present invention with the concave shape of the duct groove in natural wood, we see that while the width (W, Wn) of the two is roughly similar, the height (H) or depth (Dn) is 3≦Dn/H≦60, with Dn/H being roughly around 10, meaning that there is a difference of about 10 times between the two.

The widths (W, Wn) of both are considered to be the same because they are considered to mainly affect the appearance. On the other hand, the heights (H) and depths (Dn) of both, which are considered to mainly affect the feel, are about 10 times different, and this is presumed to be as follows. Regarding the depth (Dn) of the concave shape of the vessel groove in natural wood, considering the ratio of the width (Wn) and depth (Dn) of the concave shape and both dimensions, it is considered difficult for the skin to reach the bottom of the concave shape, and the actual depth (Dn) is considered not to be fully reflected in the feel. On the other hand, the height (H) of the convex shape of the vessel-like convex streak portion 2 is considered to be a convex shape that the skin must overcome, and the entire height (H) can be felt, and this difference in the feel of both is presumed to be the reason why the ratio Dn/H of the height (H) and depth (Dn) to obtain a similar feel is about 10 times different.

<Positional relationship between the picture pattern of the picture pattern layer and the tubular convex rib portion in a plan view>
In natural wood boards, the vessel grooves have a concave shape. In conventional decorative materials, the vessel groove portions of the wood grain pattern having vessel grooves are formed to be relatively concave. In contrast, the wood grain decorative material 10 of the present invention is significantly different in that the vessel groove portions are expressed as vessel-like ridges 2, i.e., convex shapes, as described above. With respect to the appearance and feel obtained by the concave shapes in natural wood boards, the convex shapes in the wood grain decorative material of the present invention make it possible to obtain an appearance and feel closer to those of natural wood boards. The appearance and feel obtained by the wood grain decorative material of the present invention are closer to those of natural wood boards than those of conventional decorative materials in which the vessel groove portions are formed as relative concave shapes.

In the wood grain decorative material 10 of the present invention, the duct-like ridges 2 correspond to the duct grooves of the wood grain pattern. That is, an observer of the wood grain decorative material 10 of the present invention can visually and tactilely perceive the duct-like ridges 2 as duct grooves in the wood grain pattern. However, this does not necessarily mean that the parts of the picture pattern layer 3 that represent the duct grooves (usually represented as relatively dark areas) and the duct-like ridges 2 are in the same position (overlapped) in a planar view, i.e., the patterns are synchronized.

In the wood grain decorative material 10 of the present invention, the duct-like ridges 2 may be in harmony with the duct groove portions of the wood grain pattern in the picture pattern layer 3, but may also be out of harmony with the duct groove portions of the wood grain pattern in the picture pattern layer 3. Typical examples of pattern harmony include those in which, in a plan view, the duct groove portions of the wood grain pattern in the picture pattern layer 3 and the duct-like ridges 2 overlap at the same position, or those in which the duct groove portions of the wood grain pattern in the picture pattern layer 3 overlap with relative recesses that occur between adjacent duct-like ridges 2.

However, since the process of forming the picture pattern layer 3 (typically a printing process) and the process of forming the duct-like ridges 2 (typically an embossing process) are separate processes, it is generally difficult to align the relative positions of the duct grooves of the wood grain pattern in the picture pattern layer 3 and the duct-like ridges 2, i.e., to register them. In particular, when the substrate 1 is made of a strip-shaped sheet of thermoplastic resin, in the embossing process of forming the duct-like ridges 2, the substrate 1 is heated and softened, and the substrate is conveyed under tension in its longitudinal direction while being shaped (embossed) into the duct-like ridges 2. For this reason, the substrate 1 expands and contracts, and even if the substrate is designed so that the positional relationship between the duct-like ridges 2 on the printing plate and the embossing plate is perfectly aligned with the duct grooves in the wood grain pattern, it is difficult to align the positions of the two due to the expansion and contraction of the substrate.

Therefore, even if the position of the vessel groove portion of the wood grain pattern and the vessel-like ridge portion in plan view is misaligned to an extent that can be visually distinguished upon careful observation, if the observer does not visually or tactilely perceive the misalignment between the two in plan view as unnatural or unnatural, then it is considered that there is no misalignment, i.e., the patterns are in sync. The degree of the observer's perception of misalignment is highly dependent on the type of wood grain pattern, and therefore difficult to quantify in general, but here, if the misalignment is within 3 mm, then the patterns are in sync and the vessel-like ridge portion 2 corresponds to the vessel groove portion of the wood grain pattern.

As described above, in the wood grain decorative material 10 of the present invention, the vessel-shaped ridges 2 do not have to be in sync with the vessel groove portions of the wood grain pattern in the picture pattern layer 3. This is not limited to cases where the misregistration between the vessel groove portions of the wood grain pattern in the picture pattern layer 3 and the vessel-shaped ridges 2 exceeds 3 mm. In an extreme and preferred example, the vessel groove pattern represented by the vessel groove portions of the wood grain pattern in the picture pattern layer 3 and the vessel groove pattern represented by the vessel-shaped ridges 2 may be separate patterns. However, if the two vessel groove patterns are significantly different, it will create a sense of incongruity in appearance and feel, so it is preferable that the two vessel groove patterns are somewhat similar.

Specifically, with regard to the difference between the vessel groove pattern expressed by the vessel groove portions of the wood grain pattern in the picture pattern layer 3 and the vessel groove pattern expressed by the vessel-like ridges 2, it is preferable that the difference in the extension direction of the vessel groove pattern be within ±20°, and the difference in vessel density be 50% to 200% of the other. When both are satisfied, an observer of the wood grain decorative material 10 according to the present invention can visually and tactilely perceive the vessel-like ridges 2 as vessel grooves without any sense of incongruity, and the vessel-like ridges 2 can correspond to the vessel groove portions of the wood grain pattern.
Here, the vessel density can be defined as the number of vessel groove patterns that are crossed by a line segment of a unit length in a direction perpendicular to the extension direction of the vessel groove pattern in the extension plane of the wood grain decorative material 10. In the present invention, since only the ratio of vessel densities is of concern, the unit length may be replaced with a predetermined length. In order to reduce the influence of variations due to measurement positions, it is preferable to make the predetermined length sufficiently long, or to adopt an average value obtained by measuring multiple points.

Furthermore, by making the planar view patterns of both the tubular ridge portions 2 and the tubular groove portions of the wood grain pattern in the picture pattern layer 3 the same, either a "straight grain" pattern or a "cross grain" pattern, even if the misregistration between the tubular ridge portions 2 and the tubular groove portions of the wood grain pattern in the picture pattern layer 3 exceeds 3 mm, there will be little sense of incongruity in appearance and feel, and the tubular ridge portions 2 can correspond to the tubular groove portions of the wood grain pattern.
That is, when the tubular ridge portion 2 has a "straight grain" pattern, the tubular groove portion of the wood grain pattern in the picture design layer 3 also has a "straight grain" pattern.
Furthermore, when the tubular ridge portion 2 has a "cross grain" pattern, the tubular groove portion of the wood grain pattern in the picture design layer 3 also has a "cross grain" pattern.

Here, the terms "straight grain" and "cross grain" are concepts that follow the definitions commonly used in the lumber industry.
"Straight grain" refers to a form in which, when a wooden board is viewed in a plan view, the autumn or spring wood parts of the annual rings, the vessel grooves, or other characteristic patterns of the grain pattern that make up the grain pattern form a group of roughly parallel straight lines or a group of lines close to this.
In addition, "grain" refers to a form in which, when viewed in a plan view of a wooden board, the autumn or spring wood parts of the annual rings, the vessel grooves, or other characteristic patterns of the grain pattern form a group of parallel straight lines or an arrangement of lines similar to these, which are made up of lines having one or more vertices or maximum points in one direction that are similar to (approximate to) a semicircle, semiellipse, hyperbola, parabola, triangle, etc.

In the wood grain decorative material 10 of the present invention, even if the duct-like ridge portions 2 are not in harmony with the duct groove portions of the wood grain pattern in the picture pattern layer 3, an observer of the wood grain decorative material 10 can visually and tactilely perceive the duct-like ridge portions 2 as duct grooves without any sense of incongruity.
From a visual perspective, the vessel groove pattern of the picture pattern layer 3 and the vessel-like ridges 2 are not particularly separated but are mixed together as one unit, and the extension direction and vessel density are thought to be vaguely perceived as a vessel groove pattern. From a tactile perspective, the extension direction and vessel density are thought to be vaguely perceived only for the vessel-like ridges 2. If there is no difference between the visual and tactile aspects in the extension direction and vessel density of the vessel groove pattern thus vaguely perceived, it is thought that the wood grain decorative material 10 will not feel strange.

If we consider that humans only vaguely recognize the extension direction and vessel density of the vessel groove pattern, it is understood that humans have a fairly loose perception of the misregistration between the vessel groove pattern represented by the vessel groove portion of the wood grain pattern in the picture pattern layer 3 and the vessel groove pattern represented by the vessel-like ridge portion 2. Therefore, even if the relationship of the convex and concave portions is reversed between the vessel groove pattern represented by the vessel groove portion of the wood grain pattern in the picture pattern layer 3 and the vessel groove pattern represented by the vessel-like ridge portion 2 (i.e., even if the vessel groove pattern portion represented by the vessel groove portion of the wood grain pattern in the picture pattern layer 3 has a convex and concave portion formed therein), it is unlikely to feel strange. Furthermore, even if the vessel groove pattern represented by the vessel groove portion of the wood grain pattern in the picture pattern layer 3 and the vessel groove pattern represented by the vessel-like ridge portion 2 are different patterns, it is unlikely to feel strange if the above conditions are satisfied for the extension direction and vessel density of the vessel groove pattern.

As mentioned above, it is difficult to align the vascular groove portion of the wood grain pattern in the picture pattern layer 3 with the vascular ridge portion 2, but with the wood grain decorative material 10 of the present invention, there is little need to align the two, and if the vascular groove patterns of the two are different, alignment is not necessary in the first place. Therefore, in the manufacturing process of the wood grain decorative material 10, losses due to misalignment and losses until alignment can be reduced. This improves productivity and reduces manufacturing costs.

As described above, according to the wood grain decorative material 10 of the present invention, the conduit groove pattern represented by the conduit groove portion of the wood grain pattern in the picture pattern layer 3 and the conduit groove pattern represented by the conduit-like ridge portion 2 may be separate patterns. Therefore, even if the printing plate for the picture pattern layer 3 needs to be created for each product, the embossing plate for forming the conduit-like ridge portion 2 does not need to be created for each product, and an embossing plate with a conduit density close to the conduit density of the conduit groove pattern represented by the conduit groove portion of the wood grain pattern in the picture pattern layer 3 can be selected and applied. This reduces the labor and costs involved in creating the embossing plate, resulting in a significant cost reduction in the embossing process, which in turn reduces the manufacturing cost.

Furthermore, since the conduit groove pattern represented by the conduit groove portion of the wood grain pattern in the above-mentioned picture pattern layer 3 and the conduit groove pattern represented by the conduit-like ridge portion 2 may be different patterns, the conduit groove pattern represented by the conduit-like ridge portion 2 can be freely designed within a range that satisfies the above-mentioned condition of not creating a sense of incongruity with respect to the item, i.e., the conduit groove pattern represented by the conduit groove portion of the wood grain pattern in the picture pattern layer 3. Therefore, the shape of the conduit-like ridge portion 2 can be designed to reduce the above-mentioned problems with conventional wood grain pattern decorative materials that imitate natural wood boards to a certain extent, such as those in Patent Document 1, namely, the problem of a poor uneven texture compared to natural wood boards, and the problem of the conduit groove portion being less sharp in appearance.

Specifically, whereas the duct grooves in a natural wood board have a concave shape, in the wood grain decorative material 10 the duct-like ridges 2 have a convex shape, and preferably the width W of the duct-like ridges 2 in a cross-sectional view perpendicular to the extension direction thereof is designed to monotonically decrease with increasing distance from the base material 1, and the height H of the duct-like ridges 2 is designed to be in the range of 10 μm≦H≦50 μm.
The wood grain decorative material 10 according to the present invention can provide a highly uneven texture and a sharp appearance of vascular grooves that are closer to those of natural wood boards, thus solving the above-mentioned problems with conventional wood grain decorative materials.

Furthermore, as described above, the vessel grooves, which are concave in natural wood boards and conventional decorative materials, are convex in the wood grain decorative material 10 as the vessel-like ridges 2, thereby solving the problem in conventional decorative materials that it is difficult to remove dirt that has entered into the narrow recesses that reproduce the vessel groove portions. In other words, since there are no narrow recesses that mimic the vessel groove portions in the wood grain decorative material 10, the problem of difficulty in removing dirt from the recesses does not occur, and the wood grain decorative material 10 is easy to clean. In the wood grain decorative material 10, the uneven tactile sensation of the vessel groove portions is guaranteed by the vessel-like ridges 2 that have a convex shape.

As a preferred embodiment of the wood grain decorative material 10 of the present invention, an example in which the duct-shaped ridges 2 and the duct grooves of the wood grain pattern in the pattern layer 3 are not in sync with each other is shown, and the effects based on this are also described. However, the wood grain decorative material 10 of the present invention does not exclude an embodiment in which the patterns are in sync with each other, that is, the duct-shaped ridges 2 and the duct grooves of the wood grain pattern in the pattern layer 3 may be in sync with each other. As described above, the patterns are in sync if the misregistration between the two is within 3 mm. The misregistration amount here is the distance between the center line segment in the width direction of the duct-shaped ridges 2 and the center line segment in the width direction of the duct grooves of the wood grain pattern in the pattern layer 3, and if the center lines are not parallel in a plan view, the distance is the distance between the midpoints of the two center lines. In the preferred embodiment, the width of the duct-like ridges 2 is different from the width of the duct grooves of the wood grain pattern in the picture pattern layer 3, so it is not appropriate to use the outlines of each width as a criterion for misregistration.

Compared to the non-synchronized pattern configuration, the synchronized pattern configuration has the effect that even when an observer carefully observes the wood grain pattern decorative material 10, the observer is less likely to feel discomfort, mainly from a visual perspective. And, like the non-synchronized pattern configuration, the synchronized pattern configuration can solve the above-mentioned problems with conventional wood grain pattern decorative materials in the same manner as described above. Furthermore, of the above-mentioned effects of the non-synchronized pattern configuration, with the exception of the effect of reducing losses related to misregistration and the effect of reducing the creation of embossing plates, i.e., the effect of improving productivity and reducing manufacturing costs, the synchronized pattern configuration can also achieve the above-mentioned effects in the same manner as the non-synchronized pattern configuration.

<Surface roughness of wood grain decorative material>
The objective of the present invention is to provide a wood grain decorative material 10 having an appearance and texture closer to that of natural wood boards, and the methods for achieving this have been described above. By the way, the appearance can be made even closer to that of natural wood boards by making the surface roughness of the wood grain decorative material 10 into the following form.

In the wood grain decorative material 10, the surface of the ductile ridge portion 2 is preferably rougher than the surface of the portion 2s of the wood grain decorative material where no ductile ridge portion exists. Here, the surface of A is rougher than the surface of B, meaning that the arithmetic mean roughness Ra of A is greater than the arithmetic mean roughness Ra of B, as defined in JIS B 0601:2013. In other words, it is preferable that the arithmetic mean roughness Ra of the ductile ridge portion 2 is greater than the arithmetic mean roughness Ra of the portion 2s of the wood grain decorative material where no ductile ridge portion exists. When calculating the arithmetic mean roughness Ra of the ductile ridge portion 2, the top (highest part) of the ductile ridge portion 2 may be measured along the extension direction of the ductile ridge portion 2.

In order to make the arithmetic mean roughness Ra of the ductile ridges 2 larger than the arithmetic mean roughness Ra of the portions 2s on the surface of the woodgrain decorative material where no ductile ridges exist, fine irregularities that increase the arithmetic mean roughness Ra may be provided on the surface of the portion of the embossing plate corresponding to the ductile ridges 2 in the embossing process for forming the ductile ridges 2. Of course, other methods may be used to make the arithmetic mean roughness Ra of the ductile ridges 2 larger than the arithmetic mean roughness Ra of the portions 2s on the surface of the woodgrain decorative material where no ductile ridges exist.

By satisfying the above relationship of arithmetic mean roughness Ra, the duct-like ridges 2 can be made into a relatively matte portion, and the portion 2s where there are no duct-like ridges can be made into a relatively glossy portion. This allows the duct-like ridges 2 to be made into a relatively dark portion, and the portion 2s where there are no duct-like ridges can be made into a relatively bright portion, in normal observation light, i.e., reflected light. In a natural wood board, the duct groove portion is recognized as a dark portion in appearance because it is a concave groove, and the portion that is not a duct groove is recognized as a bright portion because it is a relative convex portion. In other words, by satisfying the above relationship of arithmetic mean roughness Ra in the wood grain decorative material 10, the portion corresponding to the duct groove in design can be made into a dark portion and the other portion can be made into a bright portion, similar to the above relationship of light and dark due to the presence or absence of duct grooves in a natural wood board, i.e., a more natural appearance can be obtained.

However, contrary to the relationship of the above arithmetic mean roughness Ra, in the wood grain decorative material 10, the surface of the portion 2s on the surface of the wood grain decorative material where no tubular ridge portions are present may be rougher than the surface of the tubular ridge portions 2.
In order to make the arithmetic mean roughness Ra of the portion 2s on the surface of the wood grain decorative material where no ductile ridges exist greater than the arithmetic mean roughness Ra of the ductile ridges 2, fine irregularities that increase the arithmetic mean roughness Ra may be provided on the surface of the portion of the embossing plate corresponding to the portion 2s on the surface of the embossing plate where no ductile ridges exist in the embossing process for forming the ductile ridges 2. Of course, the arithmetic mean roughness Ra of the portion 2s on the surface of the wood grain decorative material where no ductile ridges exist may be made greater than the arithmetic mean roughness Ra of the ductile ridges 2 by other methods.

By satisfying the above relationship of arithmetic mean roughness Ra, the portion 2s where no vascular ridges exist can be made a relative matte portion (dark portion), and the vascular ridges 2 can be made a relative gloss portion (light portion). This is the opposite relationship to the above-mentioned light-dark relationship due to the presence or absence of vascular grooves in natural wood boards. However, as mentioned above, considering that humans have a fairly loose perception of the misalignment between the vascular groove pattern expressed by the vascular groove portion of the wood grain pattern in the picture pattern layer 3 and the vascular groove pattern expressed by the vascular ridges 2, if there is a natural and moderate unevenness to the touch and a moderate brightness and darkness in appearance due to the unevenness, the bright portion will not be strictly recognized as a relative convex or concave portion, i.e., there is no sense of incongruity.

In this embodiment, the areas 2s where there are no duct-like ridges, which account for a large proportion in plan view, are dark areas, and the duct-like ridges 2, which account for a small proportion in plan view, are light areas. This has the effect of highlighting the presence of light areas, since a small proportion of light areas exist in a dark area that accounts for a large proportion in plan view. By highlighting the presence of light areas caused by the duct-like ridges 2 in this way, the duct-like grooves are visually recognized as sharp by humans, even though this is the opposite relationship to the relationship of light and dark due to the presence or absence of duct grooves in natural wood boards, and this further improves the problem of conventional decorative materials having visually inferior sharpness in the duct grooves.

As described above, in the wood grain decorative material 10, the surface of the portion 2s on the surface of the wood grain decorative material where no duct-like ridges exist, and the surface of the duct-like ridges 2, can have respective effects that depend on the respective forms, regardless of whether the surface is relatively rough. Which surface is roughened and the extent to which the difference in arithmetic mean roughness Ra between the two depends mainly on the duct groove pattern of the wood grain pattern, but can be determined comprehensively while taking other conditions into consideration.

(Modifications)
The above has described the form and effects of the wood grain decorative material 10 according to the present invention. In order to achieve the above-mentioned appearance and feel in the wood grain decorative material 10 according to the present invention, various variations in the layer structure other than the layer structure according to the embodiment described above are possible. Below, examples of variations in the layer structure of the wood grain decorative material 10 according to the present invention will be described with reference to the schematic cross-sectional view of FIG. 3.
In each of the following modified examples, other layers may be included in addition to the layer configurations shown. For example, a primer layer formed between layers to improve adhesion between layers may be included. At least one of the layers in the layer configurations of the following modified examples may be composed of multiple layers. For example, the substrate 1 may be composed of multiple layers, the transparent resin layer 4 may be composed of multiple layers, and the picture pattern layer 3 may be composed of multiple layers. Furthermore, the picture pattern layer 3 does not have to be formed over the entire surface of the wood grain decorative material 10 in a plan view.

First, for confirmation, the layer structure of the wood grain decorative material 10 according to the embodiment described above is shown in FIG. 3(a). In FIG. 3(a), the substrate 1, the picture pattern layer 3, and the transparent resin layer 4 are laminated in this order from the back side (bottom in the figure), and the transparent resin layer 4 has a duct-like ridge portion 2 formed by embossing. That is, the wood grain decorative material 10 has on its surface the duct-like ridge portion 2 and a portion 2s where no duct-like ridge portion exists. And because the transparent resin layer 4 is transparent, the picture pattern layer 3 can be seen through the transparent resin layer 4 from the surface side of the wood grain decorative material 10. That is, the wood grain decorative material 10 has a design on its surface that is visually appealing and tactile.

Modified examples of the layer structure of the wood grain decorative material 10 will be described below with reference to Figs. 3(b) to 3(h).
Fig. 3(b) shows a form in which another picture pattern layer 3 is laminated on the surface of the transparent resin layer 4 in the portion 2s where no duct-like ridge portion exists in Fig. 3(a). The layer structure in the portion where the other picture pattern layer 3 is laminated is the substrate 1, the picture pattern layer 3, the transparent resin layer 4, and the picture pattern layer 3 laminated in this order from the back side. The upper picture pattern layer 3 in this form can be formed, for example, by laminating the picture pattern layer 3 on the entire surface of the transparent resin layer 4, and then removing the picture pattern layer 3 formed on the duct-like ridge portion 2 by a method such as wiping. The form shown in Fig. 3(b) also provides the same effect as the wood grain decorative material 10 in the form shown in Fig. 3(a).

Figure 3(c) shows a configuration in which the picture pattern layer 3 between the substrate 1 and the transparent resin layer 4 in Figure 3(b) is not present, and the picture pattern layer 3 is formed only on a portion of the surface of the transparent resin layer 4, similar to the configuration in Figure 3(b). The layer structure is stacked in the order of substrate 1, transparent resin layer 4, and picture pattern layer 3 from the back side. The configuration in Figure 3(c) can also provide the same effect as the wood grain decorative material 10 in the configuration in Figure 3(a).

The transparent resin layer 4 is not an essential component of the wood grain decorative material 10 according to the present invention. For example, as shown in Fig. 3(d), a picture pattern layer 3 may be formed on the surface side of the substrate 1 and then embossed. In this embodiment, the picture pattern layer 3 is also formed on the duct-like convex stripe portion 2. The embodiment according to Fig. 3(d) can also provide the same effects as the wood grain decorative material 10 according to Fig. 3(a).
As another example, as shown in Fig. 3(e), after the substrate 1 is embossed, a picture pattern layer 3 may be laminated only on the portion 2s where no tubular ridge portion is present, as in Fig. 3(b) and Fig. 3(c). The embodiment shown in Fig. 3(e) can also provide the same effect as the wood grain decorative material 10 shown in Fig. 3(a).

In the wood grain decorative material 10 according to the present invention, the transparent resin layer 4 may also serve as the substrate 1. That is, in such an embodiment, the substrate 1 is made of a transparent resin. In this embodiment, the transparent resin layer 4 can be considered as the substrate 1, and the transparent resin layer 4 can be read as the substrate 1, or the substrate 1 can be read as the transparent resin layer 4.
For example, as shown in Fig. 3(f), a duct-like convex rib portion 2 may be formed in a transparent resin layer 4 that also serves as a substrate 1, and a picture pattern layer 3 may be laminated on the back side of the transparent resin layer 4. In this form, too, the picture pattern layer 3 can be seen through the transparent resin layer 4 from the front side of the wood grain decorative material 10. In this form, the mechanical strength of the wood grain decorative material 10 is solely borne by the transparent resin layer 4. Even in the form shown in Fig. 3(f), the same action and effect as the wood grain decorative material 10 in the form shown in Fig. 3(a) can be obtained, despite the simple layer structure.

3(g), a further picture pattern layer 3 may be laminated on the surface of the transparent resin layer 4 in the portion 2s in FIG. 3(f) where no duct-like ridge portion is present.
3(h), a configuration may be adopted in which the picture pattern layer 3 laminated on the back surface side of the transparent resin layer 4 also serving as the substrate 1 in FIG. 3(g) is not present.
In either embodiment of FIG. 3(g) or FIG. 3(h), the same effects as those of the wood grain decorative material 10 in the embodiment of FIG. 3(a) can be obtained.
In each of the laminated forms shown in Figures 3(a) to 3(e), a picture pattern layer may be laminated on the back side. Even in these cases, the same effects as those of the wood grain decorative material 10 shown in Figure 3(a) can be obtained.

[Method of manufacturing wood grain decorative material]
Next, a method for manufacturing the wood grain decorative material 10 according to the present invention will be described with reference to the schematic cross-sectional view of Fig. 4. As described above, the laminated form of the wood grain decorative material 10 according to the present invention is various, so as an example, a method for manufacturing the wood grain decorative material 10 according to the embodiment, that is, the wood grain decorative material 10 having the layer structure according to the schematic cross-sectional view of Fig. 3(a) will be described.
First, a substrate 1 is prepared (FIG. 4(a)). In the present invention, from the viewpoint of production efficiency and handling in the subsequent steps, the substrate 1 prepared is usually a rolled up sheet on a web in many cases.

Next, a picture pattern layer 3 is formed on the surface side of the substrate 1 (FIG. 4(b)). The picture pattern layer 3 is usually formed by printing, preferably by gravure printing, offset printing, or inkjet printing, and more preferably by gravure printing. Of course, other forming methods may also be used.
Next, a transparent resin layer 4 is formed on the picture pattern layer 3 formed on the surface side of the substrate 1 (FIG. 4(c)). One example of a method for laminating the transparent resin layer 4 is a method of laminating a separately prepared transparent resin sheet on the picture pattern layer 3 side of the substrate 1 on which the picture pattern layer 3 has been laminated. Another method is a method of coating or printing a transparent resin on the surface of the picture pattern layer 3 of the substrate 1 on which the picture pattern layer 3 has been laminated.

Next, the sheet material in which the substrate 1, the picture pattern layer 3, and the transparent resin layer 4 are laminated in this order is embossed to deform and form the duct-like ridges 2 in the transparent resin layer 4 (FIG. 4(d)). In FIG. 4(d), an embossing plate used in the embossing process is shown by EM. This allows the wood grain decorative material 10 according to the present invention to be obtained (FIG. 4(e)).
In Figures 3(a) and 4(e), which show schematic cross-sectional views of the embodiment, only the transparent resin layer 4 among the layers constituting the wood grain decorative material 10 is deformed to form the tubular convex portion 2, but it is also acceptable for the picture pattern layer 3 and even the base material 1 to be deformed in addition to the transparent resin layer 4.

As described above, the laminated form of the wood grain decorative material 10 according to the present invention can be varied as shown in Figures 3(a) to 3(h), and the manufacturing method, including the process order, varies depending on the laminated form. However, in each manufacturing method for each form of the wood grain decorative material 10 according to the present invention, the duct-like ridge portion 2 is formed by embossing. That is, in each form of the wood grain decorative material 10 according to the present invention, the duct-like ridge portion 2 is embossed.

The duct-shaped ridges 2 are embossed. Embossing makes it easy to give the duct-shaped ridges 2 a shape in which their width W monotonically decreases with increasing distance from the substrate 1, and a height H in the range of 10 μm≦H≦50 μm. In addition, because the duct-shaped ridges 2 are not layered by printing or the like, so-called blocking, which can occur when overlapping after printing, does not occur.

[Building materials]
Next, the building decoration material 20 according to the present invention will be described. As shown in the cross-sectional perspective view of Fig. 5, the building decoration material 20 according to the present invention is formed by attaching the wood grain decorative material 10 according to the present invention to an adherend 5. In other words, the building decoration material 20 is formed by attaching the wood grain decorative material 10 according to the present invention to an adherend 5.
The adherend 5 is an object to which the wood grain decorative material 10 according to the present invention is attached, and examples thereof include the following:
(1) Wall materials, ceiling materials, floor materials, etc. for buildings such as homes, offices, shops, etc.
(2) Interior materials for automobiles, railway vehicles, ships, aircraft, etc.
Of course, another layer such as a functional board, functional sheet, backing material, underlayment material, sealing or undercoat coating film may be present between the wall material, ceiling material, interior material, etc. and the wood grain decorative material 10. In such a case, the adherend 5 is considered to include the functional board, functional sheet, etc. to which the wood grain decorative material 10 is attached.
With this type of building material 20, it is possible to obtain the same effects as those of the wood grain decorative material 10 described above.

The above describes the wood grain decorative material, its manufacturing method, and building material according to the present invention, but the present invention is not limited to the above-mentioned embodiment. The above-mentioned embodiment is merely an example, and anything that has substantially the same configuration as the technical idea described in the claims of the present invention and exhibits similar effects is included in the technical scope of the present invention in any case.

The wood-grain decorative material according to the present invention solves the following three problems of conventional decorative materials having a wood-grain pattern including vascular grooves, namely, a weak uneven texture, a lack of sharpness of the vascular grooves in appearance, and poor cleaning properties. Therefore, the decorative material having a wood-grain pattern including vascular grooves according to the present invention (wood-grain decorative material) has an appearance and texture closer to that of natural wood boards, i.e., excellent design. Such wood-grain decorative materials can be suitably used as wall covering materials used on the walls of buildings such as buildings and houses, floor decorative materials used on floors, or decorative materials for decorating the surfaces of furniture, etc., especially as high-end varieties thereof.
Similarly, the building material according to the present invention can also be suitably used for the wall and floor surfaces of buildings.

REFERENCE SIGNS LIST 1: Substrate 2: Vessel-like ridge portion 2s: Portion of the surface of the wood grain decorative material where no vascular ridge portion exists 3: Design layer 4: Transparent resin layer 5: Adherend 10: Wood grain decorative material 20: Building material H: Height of vascular ridge portion W: Width of vascular ridge portion

Claims (6)

A wood grain decorative material having a substrate, a picture pattern layer, and a tubular ridge portion,
The wood grain decorative material includes the duct-like ridge portion on at least a portion of its surface,
The design layer has a wood grain pattern including a vessel groove portion,
The wood grain pattern of the design layer includes a vessel groove pattern that is formed of a group of parallel straight lines represented by the vessel groove portion,
In a plan view of the wood grain decorative material, the duct-shaped convex rib portion and the duct groove portion of the wood grain pattern are not in sync with each other and are in an overlapping positional relationship in a plan view;
In a plan view of the wood grain decorative material, an angle formed between an extension direction of the conduit groove pattern represented by the conduit-shaped ridge portion and an extension direction of the conduit groove pattern forming a parallel straight line group arrangement represented by the conduit groove portion of the wood grain pattern is 20° or less, and a conduit density of the conduit groove pattern represented by the conduit-shaped ridge portion is 50% or more and 200% or less of a conduit density of the conduit groove pattern forming a parallel straight line group arrangement represented by the conduit groove portion of the wood grain pattern,
The wood grain decorative material, wherein the duct-like ridges are formed by embossing. The wood grain decorative material according to claim 1, in which the width W of the duct-like ridges in a cross-sectional view perpendicular to the extension direction of the duct-like ridges monotonically decreases with increasing distance from the base material. The wood grain decorative material according to claim 1 or 2, wherein the height H of the duct-like ridge portion is 10 μm≦H≦50 μm. The wood grain decorative material according to any one of claims 1 to 3, wherein the surface of the duct-like ridges is rougher than the surface of the portion of the wood grain decorative material where the duct-like ridges are not present. The wood grain decorative material according to any one of claims 1 to 3, wherein the surface of the wood grain decorative material in the portion where the duct-like ridges are not present is rougher than the surface of the duct-like ridges. A building material comprising a wood grain decorative material according to any one of claims 1 to 5 attached to an adherend.