JP4130757B2 - Decorative sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a decorative sheet in which a decorative pattern layer is visually recognized when viewed from directly above, but the decorative pattern layer becomes less visible as the viewing direction is tilted.
[0002]
[Prior art]
Conventionally, as an invention product in which the decorative pattern changes depending on the viewing direction, there has been a printed matter using a light interference phenomenon by providing a polarizing ink layer on the surface as shown in Patent Document 1.
[Patent Document 1]
JP 7-40645 A
[0003]
[Problems to be solved by the invention]
However, since the invention product as described above must use a special polarizing ink, the color is limited and the design is poor. Therefore, an object of this invention is to provide the decoration sheet which can improve the color and design property of a decoration pattern layer and a pattern concealment layer.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, at least a transparent convex layer 2 is formed on the surface of the base sheet 1, a decorative pattern layer 3 is formed on the convex layer 2, and a pattern concealment is formed thereon. The decorative sheet is characterized in that the layer 4 is formed, and the decorative pattern layer is visually recognized when viewed from directly above, but the decorative pattern layer becomes less visible as the viewing direction is tilted. . That is, according to the present invention, the decorative pattern layer 3 is formed on the convex layer 2 as shown in FIG. 1, so that the decorative pattern layer 3 is located at the back as viewed from the viewing direction, and the decorative pattern is viewed from the oblique direction. When the layer 3 is viewed, it is obstructed by the pattern concealing layer 4 so as to be difficult to see. Further, an adhesive layer 6 may be provided on the pattern hiding layer 4 in order to bond the decorative sheet to another layer (for example, a molded body).
[0005]
Further, in order to increase the effect of making the decorative pattern layer 3 obstructed by the pattern hiding layer 4 and making it difficult to see, the rising angle of the convex layer 2 is configured to be large as shown in FIG. This is because the higher the rising angle of the convex layer 2, the easier it is to be shielded by the pattern hiding layer 4 when viewing the decorative pattern layer 3 from an oblique direction. In addition, when the rising part of the convex part layer 2 is a curve, the rising angle of the tangent of a curve is made into the rising angle of the convex part layer 2, as shown in FIG.
[0006]
Specifically, the rising angle of the convex layer 2 is preferably 30 to 90 °. This is because if the rising angle is less than 30 °, it is difficult to block by the pattern concealing layer 4, and if the rising angle is larger than 90 °, an undercut shape is formed and it is difficult to form.
[0007]
Even if the rising angle of the convex layer 2 is large, if the height of the convex layer 2 is small with respect to the minimum width of the convex layer 2, the portion that is blocked by the design masking layer 4 is reduced. Therefore, it is preferable that the ratio of the height (mm) of the convex layer 2 / the minimum width (mm) of the convex layer 2 is large. Further, if the height of the convex layer 2 is high, the decorative pattern layer can be given a sense of depth by the lens effect of the convex layer.
[0008]
The ratio of the height (mm) of the convex layer 2 / the minimum width (mm) of the convex layer 2 is preferably 0.3 to 2.5. When the ratio of the height (mm) of the convex layer 2 / the minimum width (mm) of the convex layer 2 is less than 0.3, the portion that can be blocked by the pattern concealing layer 4 decreases, and the convex layer 2 If the ratio of the height (mm) / minimum width (mm) of the convex layer 2 exceeds 2.5, it is technically difficult to hold the convex layer 2 on the base sheet 1, and the base sheet 1 The problem that it becomes easy to drop out occurs.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each constituent layer of the decorative sheet of the present invention will be described with reference to the drawings.
[0010]
The base sheet 1 has a function as a base for forming the convex layer 2, the decorative pattern layer 3, the pattern concealing layer 4, and the like, and protects these layers after being bonded to other layers. May fulfill the function of
[0011]
The material of the base sheet 1 is preferably a polyester resin, a vinyl chloride resin, an acrylic resin, a polycarbonate resin, a polypropylene resin, a polyethylene resin, a polyurethane resin, a polystyrene resin, an acetate resin, a polyamide resin, or the like. .
[0012]
The film thickness of the base sheet 1 is preferably 5 μm to 5 mm. This is because if the film thickness is less than 5 μm, the sheet is not rigid and the convex layer 2 cannot be supported, and if it is thicker than 5 mm, the sheet is too rigid and difficult to handle.
[0013]
The formation method of the base sheet 1 may be a general film forming method such as extrusion molding, calendar molding, or casting. In addition, the base sheet 1 may be subjected to easy adhesion treatment such as corona discharge treatment, plasma treatment, and easy adhesion primer coating on the surface on the side on which the printed layer is formed, if necessary.
[0014]
The convex layer 2 has a function as a base for forming the decorative pattern layer 3 and functions to protect this layer after being bonded to another layer.
[0015]
The material of the convex layer 2 is a urethane acrylate resin, epoxy acrylate resin, polyester acrylate resin, silicon acrylate resin, diene acrylate resin, melamine acrylate resin, unsaturated polyester composition, etc. Less ionizing radiation curable resins are preferred. This is because it is easy to form a thick film and a step of scattering volatile components can be eliminated. In the case where the convex layer 2 is formed by embossing the base sheet 1 itself, the material of the convex layer 2 is the same as the material of the base sheet 1.
[0016]
The cross-sectional shape of the convex layer 2 may be a trapezoidal shape shown in FIG. 2, a semicircular shape shown in FIG. 3, or a polygonal shape shown in FIG.
[0017]
Examples of the method for forming the convex layer 2 include the following methods. (1) A method in which a photosensitive resin layer is formed on the entire surface of the substrate sheet 1 and exposed with a laser beam irradiation apparatus, and then unnecessary portions are removed by photoetching. (2) A recess is formed by etching or engraving. A method in which the surface of the plate is filled with a liquid resin, the substrate sheet 1 is placed on the surface of the plate and the liquid resin is solidified, and then the solidified resin is peeled off from the recess. (3) The surface of the plate is etched or engraved. A method of embossing the base sheet 1 by placing the base sheet 1 thereon and then pressing it while applying heat. (4) A method of forming by screen printing using a metal plate. These methods can increase the rising angle of the convex layer 2 and increase the height of the convex layer 2 with respect to the minimum width of the convex layer 2 as compared with printing methods such as general gravure and offset. it can.
[0018]
The decoration pattern layer 3 is a printing layer for expressing a pattern to be decorated such as a wood grain pattern, a stone pattern, a cloth pattern, characters, a geometric pattern, and a solid surface. A plurality of decoration layers may be formed in parallel. Further, the decorative pattern layer 3 may be provided with a metal film layer such as aluminum, chromium, copper, nickel, indium, tin, or silicon oxide by a method such as vacuum deposition or plating. In this case, the metal film layer may be entirely or patterned.
[0019]
Examples of the material of the decorative pattern layer 3 include acrylic resins, vinyl chloride resins, nitrified cotton resins, polyurethane resins, and chlorinated rubber resins, but are not particularly limited.
[0020]
The thickness of the decorative pattern layer 3 is preferably 0.5 μm to 50 μm. When the film thickness is less than 0.5 μm, there is a problem that sufficient designability cannot be obtained, and when it is more than 50 μm, there is a problem that it is difficult to dry after printing. However, in the case of a metal film layer, 50 to 1200 mm is preferable. This is because when the film thickness is less than 50 mm, there is a problem that sufficient designability cannot be obtained, and when it is more than 1200 mm, there is a problem that cracks are likely to occur.
[0021]
Since the decorative pattern layer 3 is formed only on the convex layer 2, gravure printing, offset printing, screen printing, and the like that can be printed only on a smooth surface or a surface similar thereto are preferable.
[0022]
The pattern hiding layer 4 is a printed layer for expressing a pattern to be decorated such as a wood grain pattern, a stone pattern, a cloth pattern, a character, a geometric pattern, a solid pattern, etc., and a layer for concealing the decoration pattern layer 3 at the same time. It is. The pattern hiding layer 4 may be a metal film layer such as aluminum, chromium, copper, nickel, indium, tin, or silicon oxide by a method such as vacuum deposition or plating. In this case, the metal film layer may be entirely or patterned.
[0023]
Examples of the material of the pattern hiding layer 4 include acrylic resins, vinyl chloride resins, nitrified cotton resins, polyurethane resins, and chlorinated rubber resins, but are not particularly limited. However, it is preferable to include a large amount of a highly concealing colorant such as titanium oxide, a valve stem, or carbon black.
[0024]
The film thickness of the pattern hiding layer 4 is preferably 2 μm to 50 μm. This is because if the film thickness is thinner than 2 μm, there is a problem that sufficient concealing property cannot be obtained, and if it is thicker than 50 μm, it is difficult to dry after printing. However, in the case of a metal film layer, 300 to 1200 mm is preferable. This is because if the film thickness is less than 300 mm, there is a problem that sufficient concealability cannot be obtained, and if it is more than 1200 mm, there is a problem that cracks are likely to occur.
[0025]
Since the pattern hiding layer 4 must be formed not only on the convex layer 2 but also on the surface of the base sheet 1 (or the surface of the release layer 5), three-dimensional decoration such as painting, dipping, and reverse coater can be performed. The method is preferred. In addition, when it is desired to form the pattern concealing layer 4 in a pattern, it may be formed by transfer using a water transfer method or the like.
[0026]
Moreover, as shown in FIG. 5, the peeling layer 5 may be formed on the base sheet 1 and the decorative sheet may be used as a transfer sheet.
[0027]
The release layer 5 is made of acrylic resin, vinyl chloride resin, polyurethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide. A preferred material is appropriately selected according to the releasability with each layer.
[0028]
The thickness of the release layer 5 is preferably 0.5 μm to 50 μm. If the film thickness is less than 0.5 μm, there is a problem that sufficient peelability cannot be obtained, and if it is more than 50 μm, there is a problem that it is difficult to dry after printing.
[0029]
The method for forming the release layer 5 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.
[0030]
Further, an adhesive layer 6 may be provided on the pattern hiding layer 4 in order to bond the decorative sheet to another layer (for example, a molded body).
[0031]
The material of the adhesive layer 6 is acrylic resin, vinyl chloride resin, polyurethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide. A preferred material is appropriately selected according to the releasability with each layer.
[0032]
The film thickness of the adhesive layer 6 is preferably 0.5 μm to 10 μm. If the film thickness is less than 0.5 μm, there is a problem that sufficient adhesion cannot be obtained, and if it is more than 10 μm, there is a problem that it is difficult to dry after printing.
[0033]
The method for forming the adhesive layer 6 may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.
[0034]
Further, if the adhesion between the base sheet 1 and the convex layer 2 or the pattern hiding layer 4, the convex layer 2 and the decorative pattern layer, and the decorative pattern layer 3 and the graphic hiding layer 4 are poor, an anchor layer is optionally formed. May be provided.
[0035]
The material of the anchor layer is acrylic resin, vinyl chloride resin, polyurethane resin, polyester resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin, vinylon resin, acetate resin, polyamide resin A preferable material is appropriately selected according to the adhesion to each layer.
[0036]
The thickness of the anchor layer is preferably 0.5 μm to 50 μm. If the film thickness is less than 0.5 μm, there is a problem that sufficient adhesion cannot be obtained, and if it is more than 50 μm, there is a problem that it is difficult to dry after printing.
[0037]
The formation method of the anchor layer may be a method such as gravure printing, offset printing, or screen printing, or a method such as painting, dipping, or reverse coater.
[0038]
【Example】
(Example 1) A 0.2 mm polycarbonate film is used as the substrate sheet 1, and a 100 μm photosensitive resin layer made of an epoxy acrylate resin is formed on the entire surface. After exposure with a laser beam irradiation apparatus, it is unnecessary by photoetching. The important part was removed. As a result, as shown in FIG. 2, the cross-sectional shape with a rising angle of 75 ° is trapezoidal, and the height is 100 μm and the minimum width is 150 μm, that is, the height of the convex layer 2 (mm) / the minimum width of the convex layer 2 (mm ) Has a convex layer 2 composed of several straight lines with a ratio of 0.67.
[0039]
Next, using a gravure ink made of a vinyl chloride resin, a 2 μm decorative pattern layer 3 made of the letter N was formed on the convex layer 2. On the other hand, a water transfer sheet in which a 15 μm pattern concealing layer 4 made of a woodgrain pattern was formed on a polyvinyl alcohol sheet was prepared. Using this water transfer sheet, the pattern hiding layer 4 was formed on the convex layer 2 and the decorative pattern layer 3 by a water transfer method.
[0040]
The decorative sheet thus obtained becomes a decorative sheet in which only the grain pattern can be visually recognized as the viewing direction is tilted (FIG. 6), and is excellent in design so that the letter N can be visually recognized when viewed from directly above. This was a wood grain decorative sheet (FIG. 7).
[0041]
(Example 2) A polyethylene terephthalate film was used as the base sheet 1 and a 1 m release ink made of acrylic resin was used to form a solid release layer 5 on the entire surface. A concave portion made of a hemisphere having a radius of 0.1 (mm) is formed on the surface of the metal plate by engraving, and the portion is filled with a urethane acrylate-based ultraviolet curable liquid resin, and the ultraviolet curable liquid resin and the base sheet 1 on the base sheet 1 (on the release layer 5) by covering with the surface of the release layer 5 and irradiating ultraviolet rays from the back to solidify the ultraviolet curable liquid resin, and then peeling off from the recesses. The convex layer 2 arranged vertically and horizontally at regular intervals was formed. The convex part layer 2 is a faithful reproduction of the shape of the concave part formed on the surface of the metal plate. As shown in FIG. 3, the sectional shape is a semicircle, the rising angle is 90 °, the height is 100 μm, The ratio of the minimum width 200 μm, that is, the height (mm) of the convex layer 2 / the minimum width (mm) of the convex layer 2 was 0.5.
[0042]
Next, a gravure ink made of acrylic resin was used for the convex layer 2 to form a 2 μm decorative pattern layer 3. Next, a pattern concealing layer 4 made of an aluminum vapor deposition film of 700 mm was formed on the entire surface by vacuum vapor deposition. Using the transfer foil obtained in this manner, a simultaneous painting method forms a decorative sheet in which only the entire aluminum deposition surface is visible as the viewing direction is tilted (FIG. 8). The molded simultaneous painting product (FIG. 9) excellent in the designability which can visually recognize the characters was obtained.
[0043]
【The invention's effect】
In the present invention, the decorative pattern layer and the pattern hiding layer can be formed with a free design and color. Therefore, the decorative sheet of the present invention has an effect of improving the color and design of the decorative pattern layer and the pattern hiding layer.
[0044]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a decorative sheet according to the present invention.
FIG. 2 is a cross-sectional view showing an embodiment of a convex layer according to the present invention.
FIG. 3 is a cross-sectional view showing an embodiment of a convex layer according to the present invention.
FIG. 4 is a cross-sectional view showing one embodiment of a convex layer according to the present invention.
FIG. 5 is a cross-sectional view showing an example of a decorative sheet according to the present invention.
FIG. 6 is a perspective view showing an example of a decorative sheet according to the present invention.
FIG. 7 is a plan view showing an example of a decorative sheet according to the present invention.
FIG. 8 is a perspective view showing an example of a molded simultaneous painting product to which a decorative sheet according to the present invention is bonded.
FIG. 9 is a plan view showing an embodiment of a molded simultaneous painting product to which a decorative sheet according to the present invention is bonded.
[Explanation of symbols]
A Decorative sheet B Simultaneously molded article 1 Base sheet 2 Convex layer 3 Decorative pattern layer 4 Pattern hiding layer 5 Peeling layer 6 Adhesive layer 21 Rising angle 22 of convex layer 2 Minimum width 23 of convex layer 2 Convex layer Height of 2

Claims (4)

  A decorative sheet characterized in that a transparent convex layer is formed on the surface of a base sheet, a decorative pattern layer is formed on the convex layer, and at least a pattern concealing layer is formed thereon. A decorative sheet in which the decorative pattern layer is visually recognized when viewed from above, but the decorative pattern layer becomes less visible as the viewing direction is tilted. The decorative sheet according to claim 1, wherein an adhesive layer is provided on the pattern hiding layer . The decorative sheet according to claim 1 or 2 , wherein a rising angle of the convex layer is 30 to 90 °. 4. The decorative sheet according to claim 1 , wherein a ratio of height (mm) / minimum width (mm) is 0.3 to 2.5 in the convex layer.

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