JP7386593B2 - Decorative materials and methods of manufacturing decorative materials - Google Patents

Description

The present invention relates to a decorative material, and particularly to a decorative material that makes fingerprints less noticeable (has fingerprint resistance).

Decorative materials are widely used as surface decoration materials for furniture, building materials, etc. For example, Patent Document 1 discloses a technique regarding a decorative material using melamine resin. Decorative materials made of melamine resin have advantages such as excellent heat resistance, scratch resistance, stain resistance, etc., and are also characterized by good productivity.

Japanese Unexamined Patent Publication No. 197053/1983

However, these cosmetic materials made of melamine resin have a problem in that fingerprint marks are noticeable when touched by hand, and fingerprint resistance is low. This tendency was particularly noticeable in decorative materials with a so-called matte surface, which has a so-called low luster, which is formed by forming minute irregularities such as satin finish or sand grain on the surface.

Although it is possible to make fingerprint marks less noticeable (improve fingerprint resistance) by changing the material of the decorative material to a resin other than melamine resin, productivity will decrease with either material. There are other problems.

Therefore, an object of the present invention is to provide a decorative material having anti-fingerprint properties that makes fingerprint marks less noticeable regardless of the type of material. The present invention also provides a method for producing this decorative material.

One aspect of the present invention is a decorative material having an uneven surface, which has a base material and a filament groove portion in which a plurality of concave filaments are arranged on the surface of the base material, has a finite length in plan view and has a curved part, and the plurality of concave lines in the line groove have a pattern such that fingerprint resistance expressed by color difference ΔE is 1.50 or less. It is a decorative material.

Here, the color difference ΔE means "the color difference ΔE ^* _ab in the L ^* a ^* b ^* color space."
The index of "fingerprint resistance expressed by color difference ΔE" is the surface after making a decorative material using melamine resin, dropping one drop of oleic acid on the surface, and wiping it dry 10 times with a rag. It means that fingerprint resistance is expressed by the color difference ΔE between , and the surface before dropping. Therefore, the color in the L ^* a ^* b ^* color space of the surface before dropping oleic acid and the color in the L ^* a ^* b ^* color space of the surface after dropping oleic acid and wiping it dry as above. The distance is ΔE(ΔE ^* _ab ).

The plurality of concave filaments of the filament groove may have a Turing pattern.

Further, the base material and the filament grooves can also be configured to contain melamine resin.

Another aspect of the present invention is a method for manufacturing the above-mentioned decorative material, which includes the steps of: forming shading image data of a pattern of concave lines to be represented on the decorative material; A process of producing a plate having a pattern of concave lines that is the same as the pattern of stripes, and a process of producing a shaped sheet by applying ink to the side of the produced plate where the concave lines are provided and curing it. This is a method for producing a decorative material, including the steps of: laminating a shaped sheet on a resin-impregnated sheet and heat-molding it while applying pressure.

According to the present invention, it is possible to provide a decorative material in which fingerprint marks are less noticeable regardless of the material used.

FIG. 1 is an enlarged plan view of a part of the surface of the decorative material 10. As shown in FIG. FIG. 2 is a perspective view showing a part of the decorative material 10, which is schematically shown to explain the surface of the decorative material 10. As shown in FIG. FIG. 3 is a diagram illustrating an example of the form of the concave filament 13. FIG. 4 is a diagram illustrating another example of the form of the concave filament 13. FIG. 5 is a diagram illustrating another example of the form of the concave filament 13. FIGS. 6(a) to 6(d) are diagrams illustrating other examples of the form of the concave filaments 13. FIG. FIGS. 7A and 7B are diagrams illustrating an example of the arrangement of adjacent concave filaments 13. FIG. FIG. 8 is a diagram illustrating the plate 20. As shown in FIG. FIG. 9 is an enlarged plan view of a part of the surface of a decorative material of a comparative example.

Hereinafter, the present invention will be explained based on the form shown in the drawings. However, the present invention is not limited to these forms. In the drawings shown below, the sizes and proportions of members may be changed or exaggerated for ease of understanding. Further, for ease of viewing, illustrations of parts unnecessary for the explanation and repetitive symbols may be omitted.

FIG. 1 is an enlarged view (plan view) of a part of the decorative material 10 according to one embodiment, viewed from the side of the linear groove portion 12. For convenience, arrows (x, y, z) indicating directions, that is, a coordinate system are also shown in FIG. Here, the xy direction is the in-plane direction of the surface of the decorative material 10, and the z direction is the thickness direction as well as the normal direction of the xy plane representing the in-plane extent of the decorative material. Therefore, FIG. 1 is a view of the decorative material 10 viewed from the z direction, which is the side of the linear groove portion 12. Note that observing the decorative material from the thickness direction (z direction) of the decorative material as shown in FIG. 1 is also called a plan view, and a diagram illustrating the plan view is also called a plan view.
As can be seen from FIG. 1, in the decorative material 10 of this embodiment, unevenness is formed by the linear grooves 12 on the surface side that can be touched by the human eye and hands.

FIG. 2 is a perspective view schematically showing a part of FIG. 1 extracted and enlarged. As can be seen from FIGS. 1 and 2, the decorative material 10 includes a base material 11 and a linear groove portion 12 formed on one surface of the base material 11.

Each configuration will be explained in more detail below.

The base material 11 is a sheet-like member that serves as a basis for the linear groove portions 12 and has a function of imparting strength to the decorative material 10. The material of the base material 11 is not particularly limited as long as it has the same function as a conventionally known decorative material. For example, base materials include polyolefin resins such as polyethylene, polypropylene, thermoplastic olefin elastomers, and ionomers, acrylic resins such as polymethyl methacrylate and polybutyl methacrylate, and thermoplastic polyester resins such as polyethylene terephthalate and polybutylene terephthalate. , thermoplastic resins such as thermoplastic urethane resins, vinyl chloride resins, ABS resins (acrylonitrile-butadiene-styrene copolymers), styrene resins, thermosetting resins such as melamine resins, unsaturated polyester resins, two-component curable urethane resins, etc. Alternatively, an ionizing radiation-curable resin that is cured by ionizing radiation (ultraviolet light, electron beam, etc.) such as a radical polymerization type acrylate type or a cationic polymerization type epoxy type resin can be used. In addition, when the material of the base material is resin, it may be colored with a known coloring agent.
In addition, paper, non-woven fabric, metal, wood, etc. can also be used in the form of sheets, plates, three-dimensional objects, etc., laminated with the resin material as appropriate.
In this way, the fingerprint resistance of the decorative material 10 can be improved regardless of the material used.

Among these, so-called melamine resin decorative materials are made by impregnating paper with an uncured liquid composition of melamine resin and curing it, which has traditionally been used from the viewpoint of its heat resistance, scratch resistance, and productivity. A base material consisting of can be preferably used. The layer structure of a general melamine resin decorative material consists of the following layer structure and manufacturing method. Approximately 2 to 5 sheets of core paper made of kraft paper with a basis weight of 50 g/m ² to 250 g/m ² impregnated with an uncured composition of phenolic resin are stacked on top of each other, and the surface side (which is exposed and visible during use) is layered. Titanium paper with a basis weight of 50 g/m ² to 250 g/m ² impregnated with an uncured composition of melamine resin (paper mixed with titanium dioxide particles as a white hiding pigment) is layered on the surface side), and the surface side Overlay paper impregnated with an uncured composition of melamine resin is superimposed on α-cellulose pulp paper having a basis weight of about 15 g/m ² to 50 g/m ² . Then, the stacked product is heated and pressurized to cure each uncured composition and obtain a laminate in which each layer is bonded and integrated. Such a laminate is a melamine resin decorative material. According to the decorative material 10 in which the linear grooves 12 defined in the present invention are formed on the surface side of the base material 11 having the structure of such a melamine resin decorative material, it is possible to improve the fingerprint resistance even if the melamine resin is used as the material. be.

There is no particular restriction on the thickness of the base material, but in the case of a sheet-like base material or a film-like base material, for example, the thickness is about 20 μm or more and 1000 μm or less, and in the case of a plate-like base material, the thickness is, for example, 1 mm or more and 20 mm or less. Can be used to a certain degree.

The linear groove portion 12 is formed on one surface of the base material 11 and provides fingerprint resistance to the surface of the decorative material 10. In this embodiment, the linear groove portion 12 has the following configuration.

As can be seen from FIGS. 1 and 2, the filament groove portion 12 is constructed by arranging a countless number of concave filaments 13. The innumerable number of concave lines 13 provide the decorative material 10 with a fingerprint-resistant function.
Moreover, by arranging countless concave filaments 13 on the surface in this way, the concave filaments 13 diffusely reflect the incident light, thereby creating a so-called matte surface. Among conventional decorative materials with matte surfaces such as satin finish and sand grain, those made with melamine resin are particularly susceptible to fingerprint marks that are conspicuous on such matte surfaces and have low fingerprint resistance. It was a problem. On the other hand, according to the decorative material 10 of the present embodiment, fingerprint resistance can also be improved even on a matte surface due to the linear grooves 12 specific to the present invention. Note that the matteness evaluation can be performed by measuring the gloss of a decorative material shaped using a shaping sheet using a gloss meter (60 degrees, measuring device BYK Gardner, Microgloss).

The form and arrangement of the plurality of concave filaments 13 provided in the filament groove portion 12 may be configured to have anti-fingerprint properties. That is, by providing a plurality of concave lines 13, fingerprint resistance is improved.
Fingerprint resistance here refers to the conspicuousness of fingerprint marks, and fingerprint resistance makes fingerprint marks less noticeable. As a specific index of fingerprint resistance, it is evaluated using color difference ΔE, and it is sufficient if ΔE is 1.5 or less, and if ΔE is 1.0 or less, fingerprint resistance is good, and ΔE is 0.2 or less. can be evaluated as having high fingerprint resistance.
Here, the color difference ΔE means "color difference ΔE ^* _ab in L ^* a ^* b ^* color space", and the index of fingerprint resistance expressed by the color difference ΔE is obtained by producing a decorative material using melamine resin, Fingerprint resistance is expressed by the color difference ΔE (ΔE ^* _ab ) between the surface after dropping one drop of oleic acid on the surface and wiping it dry 10 times with a cloth and the surface before dropping. Therefore, the color in the L ^* a ^* b ^* color space of the surface before dropping oleic acid and the color in the L ^* a ^* b ^* color space of the surface after dropping oleic acid and wiping it dry as above. The distance is ΔE(ΔE ^* _ab ). Such color difference measurements can be obtained using, for example, a spectrophotometer CM-370 manufactured by Konica Minolta, Inc.

The form of the concave filament 13 for providing such anti-fingerprint properties is a filament groove having a finite length curved line, as can be seen from FIG. FIG. 3 shows a plan view focusing on an example of one concave filament 13. The filament groove portion 12 is formed as an aggregate in which a countless number of such concave filaments 13 are arranged.

From the viewpoint of further improving fingerprint resistance, it is preferable that the concave lines have the following form.
The width W is the shortest distance from the edge of the concave filament, passing through the deepest point of the concave filament, and connecting the edge of the concave filament on the opposite side, when the concave filament is viewed from above. The width W is preferably 1 μm or more and 100 μm or less, more preferably 1 μm or more and 25 μm or less.
The depth F is Rz when measured with a surface roughness measuring device (JIS B 0601-2001, measuring device: two-dimensional, three-dimensional surface roughness measuring device, Ryokosha Co., Ltd.). This depth F is preferably 1 μm or more and 100 μm or less, more preferably 5 μm or more and 50 μm or less.
The radius of curvature R is determined by measuring the curved portions at 10 locations for each concave filament for the five concave filaments, and taking the average value. The radius of curvature R is preferably 1 μm or more and 50 μm or less, more preferably 1 μm or more and 25 μm or less.
The length L is preferably 1 μm or more and 500 μm or less, more preferably 1 μm or more and 250 μm or less.

In this way, the concave filament 13 has a finite length and a predetermined width W (width W>0), but as such a concave filament 13, there are other Also, for example, a concave line 13 as shown in FIGS. 4 and 5 may be included.

The concave filament 13 shown in FIG. 4 has a so-called wave shape, and includes one pole part 13a (corresponding to the maximum point or minimum point in the curve) whose slope is 0, and a pole part different from the pole part 13a. 13b. Such wavy concave filaments 13 may be included.
The preferable ranges of the length, width, depth, and radius of curvature of the wavy concave filament 13 are as described for the concave filament 13 shown in FIG. 3 .

The concave filament 13 shown in FIG. 5 has branches, and is an example having a first branch 13d and a second branch 13e from one base 13c. Concave filaments 13 having such branches may be included.
The preferable ranges of the width, height, and radius of curvature of the concave filament 13 having branches are as described for the concave filament 13 shown in FIG. 3 . On the other hand, regarding the length of the concave filament 13 having branches, the total length of the base 13c and the first branch 13d, and the total length of the base 13c and the second branch 13e are shown in FIG. It is preferable that the range is as described for the concave filament 13.

In addition, the shape of the concave filament 13 in plan view is a closed curve 13f such as a circle, an ellipse, a polygon with rounded apexes (radius of curvature > 0) as shown in FIG. 6, or a modified shape thereof. May include. The closed curve 13f has a width W as in the above example.
FIG. 6(a) shows an example of a closed curve 13f having a rounded vertex and a polygon, etc., and FIG. 6(b) shows an example of a closed curve 13f having an ellipse. Such a closed curve may include a closed curve 13f _{1 with a smaller diameter inside (inside) a closed curve 13f 2 with} a larger diameter, as shown in FIG. 6(c). Moreover, as shown in FIG. 6(d), the closed curve 13f may be accompanied by an open curve 13g having a larger diameter adjacent to the outside thereof.
The shape of the concave filament 13 in plan view may be a shape in which a part of a closed curve is cut out, as shown in 13g in FIG. 6(d). Alternatively, although not shown in the drawings, the shape of the concave filament 13 in plan view is such that the concave filament 13 has a shape as shown in FIG. May contain.

By arranging countless concave filaments 13 as described above on the surface of the base material 11, the filament groove portions 12 are formed. Regarding the arrangement of the plurality of concave filaments 13 in the filament groove portion 12, any arrangement may be used as long as it can provide anti-fingerprint properties as described above.
The specific form for this purpose is not particularly limited, but as an example, the interval between adjacent concave filaments 13 is preferably 1 μm or more and 70 μm or less, and more preferably 1 μm or more and 30 μm or less. .

FIGS. 7(a) and 7(b) show examples of aspects of adjacent concave filaments 13.
FIG. 7A shows an example in which two curved concave filaments 13 are lined up so that their curved directions are aligned. In such a case, it is preferable that the farthest distance shown by G in FIG. 7(a) falls within the range of the above-mentioned interval.
FIG. 7B shows an example in which two curved concave filaments 13 have different curve directions and are lined up so that their tips enter into the space created by the curvature. Even in such a case, it is preferable that the farthest distance as shown by G in FIG. 7(b) falls within the range of the above-mentioned interval.

Moreover, when looking at the form of the plurality of concave filaments 13 of the filament groove portion 12 and their arrangement as a whole, the following can be considered. That is, the shape and arrangement of the plurality of concave filaments 13 included in the filament groove portion 12 can also be formed by a so-called Turing pattern.
A Turing pattern is a spatial pattern that spontaneously arises in a system of reaction-diffusion equations.

Here, u is the concentration of the so-called active factor, v is the concentration of the so-called inhibitory factor, D _u is the diffusion coefficient of the active factor u, D _v is the diffusion coefficient of the inhibitor v, f(u, v) and g( u, v) are functions of variables u, v.
This equation originally represents an increase/decrease in the concentration u of an active factor involved in positive feedback of various chemical reactions and the concentration v of an inhibitory factor involved in negative feedback. The first term on the right side of the above equation is called a reaction term, and is a term that determines the amount of production/decomposition of the active factor and inhibitory factor based on the ratio of the concentrations (u, v) of the active factor and inhibitory factor. The second term is called a diffusion term, and is a term that determines the amount of active factor and inhibitory factor that moves due to the diffusion phenomenon.

This reactive diffusion equation generates various patterns in the plane (u, v) depending on the diffusion coefficients D _u , D _v , functions f (u, v), g (u, v), and boundary conditions. It is known that Such a pattern is called a Turing pattern.

The plan view shape of the plurality of concave filaments 13 constituting the filament grooves 12 on the surface of the decorative material is expressed by the diffusion coefficients D _u , D _v , functions f(u, v), g(u, v), and boundary conditions. Specify the dimensions (enlargement or reduction magnification of the pattern) so that the width W, length L, radius of curvature R, and interval of the planar view shape of the concave filament 13 are within the above-mentioned preferred range, In addition, by forming a pattern in which the depth F is also defined within the above-mentioned preferable range (hereinafter, this is also referred to as a "specific Turing pattern"), the filament groove portion 12 composed of such concave filaments 13 can be seen on the surface. The provided decorative material can fully exhibit the effects of the present invention.

According to the decorative material 10 described above, fingerprint resistance can be improved regardless of the material used for the decorative material. For example, even if melamine resin is used as the material, it will have excellent fingerprint resistance.

Furthermore, the linear grooves 12 as described above can give the surface of the decorative material a matte characteristic. In this way, even a matte surface has fingerprint resistance.

There are no particular restrictions on the uses of the decorative materials described above, but examples include interior materials for buildings such as walls, floors, and ceilings, exterior materials for buildings such as exterior walls, roofs, gates, fences, and fences, doors, and windows. Surface materials for fittings such as frames, doors, door frames, edges, skirting boards, handrails, etc., surface materials for housings of home appliances such as television receivers and refrigerators, furniture such as desks, dining tables, chests of drawers, etc. Examples include surface materials, surface materials for containers such as boxes and resin bottles, interior materials or exterior materials for vehicles, etc., interior materials or exterior materials for ships, etc.

Next, a manufacturing method S10, which is an example of a method for manufacturing a decorative material, will be explained. However, the method for manufacturing the decorative material is not limited to this.
The decorative material manufacturing method S10 of this example includes a pattern creation step S11, a plate manufacturing step S12, a shaped sheet manufacturing step S13, and a shaping step S14. Each step will be explained below. In this example, the form and arrangement of the concave filaments 13 of the filament groove portion 12 will be explained using an example in which they are formed in a Turing pattern.

<Pattern creation process S11>
In the pattern creation step S11, a specific Turing pattern to be expressed in the linear groove portion 12 is formed by numerical simulation to create pattern data, and this is stored in a storage device as digital data.

<Plate making process S12>
In the plate making step S12, based on the Turing pattern obtained in the pattern making step S11, a plate (for shaped sheet (molding mold) is prepared. Specifically, the process of manufacturing the unevenness includes the following steps (1) to (5).

(1) Grayscale image data creation step Digital grayscale image data corresponding to the planar view pattern of the concave filaments 13 constituting the filament groove portion 12 is created. The grayscale image data is data in which image density corresponds to each coordinate on the surface of the metal roll, which will be described later. Here, the gradation image data can be created in TIFF format with 8-bit image gradation (256 gradations) and a resolution of 2540 dpi using the planar view pattern obtained in the pattern creation step S11.

(2) Metal roll preparation step In parallel with the above step (1), a metal roll 20 for plate engraving as shown in FIG. 8 is prepared. The metal roll 20 is formed by plating a copper layer on the surface of a hollow iron cylinder having rotation drive shafts 21 at both ends in the axial direction. The surface of the metal roll 20 is polished with a grindstone to make it rough, thereby preventing a decrease in engraving efficiency due to specular reflection of the engraving laser beam.

(3) Laser beam engraving process As schematically shown in Figure 8, a laser beam direct engraving machine is used to convert the surface of the metal roll 20 prepared in step (2) into the grayscale image data created in step (1). Carve based on. As a result, an uneven shape is formed on the surface, which is the same shape in plan view as the unevenness on the surface of the decorative material as shown in FIG.
Therefore, the shape that the unevenness on the plate should have is the same as the relationship between the unevenness on the decorative material described above.

The metal roll 20 is driven by an electric motor via its rotary drive shaft 21, and rotates about the rotary drive shaft 21 as a central axis. The entire surface of the metal roll 20 is scanned with a fiber laser beam _LA emitted from the laser head 22 with an oscillation wavelength of 1024 nm, a laser spot diameter of 10 μm, and an output of 600 W. At that time, the laser beam is switched ON and OFF (switching between irradiation and non-irradiation) according to the density value of the grayscale image data created in step (1), and the metal is irradiated with the laser beam once at the irradiation position. A recess with a depth of 10 μm is formed by evaporation. The scanning of the surface of the metal roll with the laser beam is repeated 10 times. In addition, in order to prevent the evaporated metal from turning into powder and remaining or adhering to the surface of the metal roll 20, the engraving liquid T was sprayed from the engraving liquid outlet 23 onto the laser beam irradiated area on the surface of the metal roll 20. Laser light irradiation is performed in this state.
At that time, for example, at the position coordinates of the image density corresponding to a plate depth of 50 μm on the data, the laser light is irradiated (ON) for only the first 5 scans out of a total of 10 scans, and for the remaining 5 scans. The laser light is controlled so that it is not irradiated (OFF).
The scanning of the laser beam is completed, and a desired uneven shape is formed on the surface of the metal roll 20.

(4) Electropolishing process After cleaning the engraving liquid, electrolytic polishing is performed to remove metal residues attached to the surface of the metal roll 20.

(5) Chrome plating step After step (4), a chromium layer with a thickness of 10 μm is formed on the surface of the metal roll by plating.

As described above, it is possible to obtain a plate (forming mold for a shaped sheet) having on its surface the same unevenness as the unevenness formed on the surface of the linear groove portion 12.

<Shaped sheet production process S13>
In the shaped sheet production step S13, a coating ink containing an ionizing radiation-curable acrylate monomer is coated on the easily adhesive surface of the biaxially stretched PET film using a prepared plate, and this coated ink is irradiated with ultraviolet rays. A shaped sheet is produced by performing and curing.
Thereby, it is possible to obtain a shaped sheet whose surface has an uneven shape that is opposite to the unevenness formed on the surface of the linear groove portion 12. The unevenness formed here is the opposite unevenness to the unevenness due to the concave filaments 13 of the filament groove portion 12, but its form and arrangement can be considered in the same way as described above.

<Shaping process S14>
The shaping step S14 is performed as follows.
First, titanium paper base paper is impregnated with a liquid uncured composition of thermosetting resin containing melamine formaldehyde resin using an impregnating device so that the uncured composition becomes a predetermined ratio when dried, and then dried. By doing so, an impregnated decorative sheet is obtained.
Next, this impregnated decorative sheet was laminated on a phenolic resin-impregnated core paper, which is made by impregnating kraft paper with a resin liquid made of phenolic resin, and then the formed sheet was formed on top of the prepared impregnated decorative sheet. The sheets are laminated so that the printed surface of the sheets is in contact with the printed surface of the impregnated decorative sheet.
The thus formed laminate is sandwiched between two metallic mirror plates, and heated and molded under predetermined temperature and time conditions while applying pressure using a heat press machine to form the uncured composition. Heat cure. As a result, a cured resin layer containing melamine resin is formed.
Finally, the decorative material 10 is obtained by peeling off the shaped sheet from the cured resin layer.

A decorative material was produced in accordance with Decorative Material 10 and Manufacturing Method S10 as an example. In addition, a decorative material having no striated grooves was prepared as a comparative example.

[Shape and production of decorative material of Example]
The decorative materials according to Examples 1 and 2 are shown in FIG. 1 in plan view. The concave filaments of the filament grooves provided in this decorative material are shaped and arranged according to a Turing pattern.
Such a decorative material was produced as follows.

A Turing pattern was created following the pattern creation step S11 to obtain specific Turing pattern data. This particular Turing pattern was developed as a numerical simulation by Yohei Suzuki, Takahiro Takayama, N. Motoike, "A simple reaction-diffusion cellular automaton model that generates a Turing pattern and its integrated circuit." This pattern was obtained through a simulation using an improved reaction-diffusion equation of the young model proposed by Ikuko, Institute of Electronics, Information and Communication Engineers, and IEICE Technical Report, page 3.
In this reaction-diffusion equation, a Turing pattern was generated by setting the ratio D _v /D u of the _diffusion coefficient D _u of the active factor u to the diffusion coefficient D _v of the suppressing factor v to 6, and the offset C of the sigmoid function to 0.

Next, regarding the same pattern, the dimensional data is such that the width W of the curved portion of the pattern is 10 μm or more and 20 μm, the length L is 5 μm or more and 100 μm or less, the radius of curvature R is 1 μm or more and 50 μm or less, and the interval between adjacent concave lines is 20 μm or more. The magnification of the pattern was adjusted so that it was distributed in a range of 30 μm or less. In this way, planar view pattern data exhibiting a specific Turing pattern of the filament groove portion 12 composed of the concave filaments 13 was created.

Next, a plate for the shaped sheet was prepared following the plate making process S12.

Next, a shaped sheet was produced following the shaped sheet production step S13. Specifically, it is as follows.
A 50 μm thick PET film (Cosmoshine (registered trademark) A4100 (50 μm) manufactured by Toyobo Co., Ltd.) was prepared.
In addition, 100 parts by mass of an ionizing radiation curable monomer (manufactured by Toagosei Co., Ltd., Aronix (registered trademark) M350), 2 parts by mass of reactive silicone (manufactured by Shin-Etsu Chemical Co., Ltd., X-22-164B), silica (Fuji Silysia Chemical Co., Ltd.) A coating ink containing 5 parts by mass of Cylysia 450 (manufactured by Co., Ltd.) and 50 parts by mass of ethyl acetate was also prepared.
The prepared coating ink was applied to the easy-adhesive surface of the PET film using the prepared plate, and irradiated with an electron beam of 5 Mrad at an accelerating voltage of 165 kV, and cured to obtain a shaped sheet. Ta.

Next, a decorative material according to an example was obtained following the shaping step S14. Specifically, it is as follows.
First, a liquid uncured composition of a thermosetting resin consisting of 60 parts by mass of melamine formaldehyde resin, 35 parts by mass of water, and 5 parts by mass of isopropyl alcohol was prepared.
This uncured composition was impregnated into titanium paper base paper using an impregnation device. At this time, impregnation was performed so that the uncured composition had a dry ratio of 80 g/m ² (dry). By drying this, an impregnated decorative sheet was obtained.

Next, this impregnated decorative sheet was laminated on three sheets of phenol resin-impregnated core paper (Ota Sangyo Co., Ltd., Ota Core) having a basis weight of 245 g/m ² and made by impregnating kraft paper with a resin liquid consisting of a phenol resin.
Furthermore, the formed sheet produced on the impregnated decorative sheet was laminated so that the printed surface of the formed sheet was in contact with the printed surface of the impregnated decorative sheet.
Thereafter, the formed laminate was sandwiched between two mirror plates and heat-molded using a heat press machine at a pressure of 100 kg/cm ² and a molding temperature of 150°C for 10 minutes, and the uncured composition was heat-molded. By curing, a cured resin layer containing melamine resin was formed.

Finally, the shaped sheet was peeled off from the cured resin layer to obtain a decorative material according to an example.

[Shape and production of decorative material of comparative example]
For the decorative material of the comparative example, a shaped sheet was produced using a so-called blast matte film that does not have striated grooves. Using this shaped sheet, a decorative material was obtained in the same manner as the decorative material of the example. FIG. 9 shows an enlarged plan view of a part of the decorative material according to the comparative example. FIG. 9 has the same perspective and scale as FIG. 1.

[Evaluation method/results]
In addition to measuring the length L, width W, depth F, radius of curvature R, and interval of the concave filaments using the method described above, quantitative evaluation of the gloss of the decorative material, fingerprint resistance by visual inspection, and fingerprint resistance by color difference ΔE I did it. The results are shown in Table 1.
Here, "length", "width", "radius of curvature", and "interval" were measured using an optical microscope VHX-6000 manufactured by Keyence Corporation. "Depth" was measured using a two-dimensional and three-dimensional surface roughness measuring device manufactured by Ryokosha Co., Ltd. In addition, “length,” “width,” “depth,” “radius of curvature,” and “spacing” are calculated using five imprinting sheets of each level (Example 1, Example 2, Comparative Example), and each imprinting sheet. Measurements were made at 10 points from the shape sheet, with a total of 50 data points.
"Gloss" was measured using a gloss meter (60 degrees, measuring device BYK Gardner, Microgloss).
"Fingerprint resistance (visual observation)" means that the surface of the decorative material is touched with a finger and visually observed, and if it has high fingerprint resistance, it is marked as "◎", and if it has fingerprint resistance, it is marked as "〇". When the value was low, it was marked as "×".
"Fingerprint resistance (colorimetric ΔE value)" was obtained by measuring ΔE ^* _ab using a spectrophotometer CM-370 manufactured by Konica Minolta, Inc., as described above.

As can be seen from the results, it can be seen that the decorative materials of Examples 1 and 2 are excellent in fingerprint resistance both visually and quantitatively.

10 Decorative material 11 Base material 12 Line groove portion 13 Concave line

Claims (3)

A decorative material with unevenness formed on the surface,
a base material, and a striated groove portion in which a plurality of concave striations are arranged on the surface of the base material,
The concave filament has a finite length in plan view and has a curved part,
The concave filaments have a length of 23 μm to 413 μm, a width of 5 μm to 65 μm, and a depth of 15 μm to 35 μm, and when the radius of curvature at the curved portion is 2 μm to 14 μm, the interval between adjacent concave filaments is 4 μm to 11 μm, and when the radius of curvature in the curved portion is 17 μm to 38 μm, the interval between the adjacent concave filaments is 15 μm to 50 μm,
The plurality of concave filaments of the filament groove have a Turing pattern, and
A decorative material, wherein the plurality of concave filaments of the filament groove have a pattern in which fingerprint resistance expressed by color difference ΔE is 1.50 or less. The decorative material according to claim 1, wherein the base material and the filament groove portion contain a melamine resin. A method for manufacturing the decorative material according to claim 1 or 2 , comprising:
forming gradation image data of the pattern of the concave lines to be represented on the decorative material;
producing a plate having a pattern of concave striations that is the same as the pattern of concave striations based on the grayscale image data;
a step of producing a shaped sheet by applying ink to the side provided with the concave lines of the produced plate and curing it;
A method for producing a decorative material, comprising the steps of: laminating the shaped sheet on a resin-impregnated sheet and heat-molding it while applying pressure.

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