Decorative metal sheet and method for producing the same

Abstract

To solve the following problem that: further enhancement of design properties is demanded for a decorative metal sheet, and especially, high-definition formation of a pattern in a pattern layer is strongly desired.SOLUTION: In a decorative metal sheet 10 comprising a base material 11 having a plate shape made of metal, and a pattern layer 15 laminated on a surface side of the base material 11 and formed with a pattern, the pattern layer 15 has a pattern resolution of 600 dpi or more and 1200 dpi or less, and includes first dots each having a first diameter of a first size, and second dots each having a second diameter of a size different from the first size.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a decorative metal plate in which a pattern or the like is printed on the surface of a metal plate-shaped substrate. [Background technology]

[0002] Decorative metal sheets, in which a pattern or the like is printed on the surface of a metal plate-shaped substrate, are widely used for a variety of applications, including building materials such as doors, shutters, and siding for buildings, and surface materials for home appliances, etc. Such decorative metal sheets are manufactured by providing a base colored layer via a primer layer on the surface of a metal plate-shaped substrate on which a chemical conversion coating has been formed, then gravure offset printing a pattern layer on the colored layer, and then providing a surface protective layer on the pattern layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-090002 [Patent Document 2] Japanese Patent Publication No. 2020-090003 Summary of the Invention [Problem to be solved by the invention]

[0004] In the decorative metal sheets described above, further improvements in design are required, and in particular, there is a strong demand for higher definition of the design of the design layer. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, the decorative metal plate of the present invention comprises a metal plate-shaped substrate and a pattern layer laminated on the surface side of the substrate to form a pattern, wherein the pattern layer has a pattern resolution of 600 dpi or more and 1200 dpi or less, and has first dots having a diameter of a first size and second dots having a second diameter different from the first size.

[0006] Furthermore, it is preferable that the decorative metal plate of the present invention is the decorative metal plate described above, wherein the pattern layer further has a third dot having a third diameter that is different from the first size and the second size.

[0007] Furthermore, the decorative metal sheet of the present invention is preferably the decorative metal sheet described above, wherein the first size is any one of the ranges of 1 μm or more and less than 5 μm, 5 μm or more and less than 10 μm, or 10 μm or more and less than 15 μm, and the second size is any one of the ranges excluding the first size.

[0008] Furthermore, the decorative metal sheet of the present invention is preferably such that, in the decorative metal sheet described above, the first size is any one of the ranges of 1 μm or more and less than 5 μm, 5 μm or more and less than 10 μm, or 10 μm or more and less than 15 μm, the second size is any one of the ranges excluding the first size, and the third size is any remaining one of the ranges excluding the first size and the second size.

[0009] Furthermore, the decorative metal sheet according to the present invention is preferably the decorative metal sheet described above, further comprising a colored layer laminated between the substrate and the pattern layer.

[0010] Furthermore, the decorative metal sheet according to the present invention is preferably the decorative metal sheet described above, further comprising a base layer laminated between the base material and the colored layer.

[0011] Furthermore, the decorative metal sheet according to the present invention is preferably the decorative metal sheet described above, further comprising a transparent surface protection layer laminated on the surface side of the design layer to protect the surface.

[0012] Furthermore, the decorative metal sheet according to the present invention is preferably the decorative metal sheet described above, further comprising a back surface coating layer laminated on the back surface side of the base material to cover the back surface.

[0013] Furthermore, the decorative metal sheet according to the present invention is preferably the decorative metal sheet described above, in which a chemical conversion coating layer is provided on the front and back surfaces of the substrate.

[0014] Furthermore, in the decorative metal sheet according to the present invention, it is preferable that the substrate is a steel sheet having a metal coating formed on the front and back surfaces thereof.

[0015] On the other hand, the method for manufacturing a decorative metal sheet according to the present invention is the method for manufacturing the decorative metal sheet described above, characterized in that the pattern layer is formed by inkjet printing using a multi-drop method. [Effects of the Invention]

[0016] According to the decorative metal plate and its manufacturing method of the present invention, the resolution of the pattern of the pattern layer is 600 dpi or more and 1200 dpi or less, and the pattern layer has first dots with a diameter of a first size and second dots with a second diameter of a size different from the first size, so that the pattern of the pattern layer can be made highly precise, and the design can be further improved. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of a main embodiment of a decorative metal plate according to the present invention. [Figure 2] 3 is an explanatory diagram of a pattern layer forming step in the main embodiment of the method for manufacturing a decorative metal sheet according to the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present invention will be described with reference to the accompanying drawings, which are provided to explain the present invention in detail. The present invention is not limited to the following embodiments, but various technical matters described in each embodiment can be appropriately combined or substituted as necessary.

[0019] [Main embodiment] <Overall structure of decorative metal sheet> As shown in Fig. 1, a chemical conversion coating layer 12 is provided on each of the front surface (upper surface in Fig. 1) and back surface (lower surface in Fig. 1) of a metal plate-shaped substrate 11. A base layer 13 is provided on the surface (upper surface in Fig. 1) of the chemical conversion coating layer 12 on the front surface side of the substrate 11. A colored layer 14 is provided on the surface (upper surface in Fig. 1) of the base layer 13.

[0020] A design layer 15 is provided on the surface (top surface in FIG. 1) of the colored layer 14. A transparent surface protection layer 16 is provided on the surface (top surface in FIG. 1) of the design layer 15. In addition, a back surface coating layer 17 is provided on the back surface (bottom surface in FIG. 1) of the chemical conversion coating layer 12 on the back surface side of the substrate 11. The decorative metal sheet 10 according to this embodiment will now be described in more detail.

[0021] <Base material 11> The substrate 11 is a metal material in the shape of a plate, and preferably has a thickness of 0.25 mm or more and 6 mm or less. Examples of metal materials include steel plate and aluminum plate. The steel plate preferably has a metal coating formed on its front and back surfaces to improve adhesion and corrosion resistance. The metal coating preferably has a total thickness of 8 μm or more and 110 μm or less on both sides, and can be formed by various plating methods such as hot-dip galvanizing, electrogalvanizing, and alloying plating.

[0022] <Chemical coating layer 12> The chemical conversion coating layer 12 is formed on the front and back surfaces of the substrate 11 by chemical conversion treatment in order to improve the white rust resistance of the substrate 11, and the amount of the chemical conversion coating layer 12 is 50 mg / m 2 More than 150mg / m 2The chemical conversion coating layer 12 is preferably formed by the chromate-free treatment, which can reduce the environmental impact.

[0023] Examples of treatment solutions used in chromate-free treatments include treatment solutions that do not contain hexavalent chromium, such as zinc phosphate treatment solutions, treatment solutions containing salts of Zr or Ti or both, or treatment solutions containing a silane coupling agent. By using such treatment solutions, chromate-free chemical conversion coatings can be formed on the plated metal coating, containing Ti, Zr, P, Ce, Si, Al, Li, or the like as primary components, but without chromium. In other words, the chromate-free chemical conversion coatings contain, for example, Ti, Zr, P, Ce, Si, Al, Li, or any combination thereof.

[0024] <Base layer 13> The underlayer 13 is provided to improve the adhesion between the substrate 11 (chemical conversion coating layer 12) and the colored layer 14 and the corrosion resistance of the substrate 11, and preferably has a thickness of 1 μm or more and 15 μm or less. Examples of materials for the underlayer 13 include known underlayer resin paints containing epoxy resins, polyester resins, urethane resins, melamine resins, alkyd resins, phenolic resins, acrylic resins, etc. The underlayer 13 can also contain anti-rust pigments to further improve corrosion resistance.

[0025] <Colored layer 14> The colored layer 14 is provided to impart a base color to the design of the design layer 15, and preferably has a thickness of 10 μm or more and 30 μm or less. Examples of materials for the colored layer 14 include known coloring resin paints containing a binder resin made of a polyester resin, a melamine resin, a urethane resin, an epoxy resin, an alkyd resin, a phenolic resin, an acrylic resin, or the like, and a base color pigment.

[0026] To improve weather resistance, the colored layer 14 preferably contains at least one of an ultraviolet absorber (UVA) and a light stabilizer (HALS). The UVA and HALS are each preferably contained in an amount of 0.5% by mass to 1.5% by mass relative to the total mass of the colored layer 14. Examples of UVA include hydroxyphenyltriazines, and examples of HALS include N-OR type hindered amines.

[0027] The colored layer 14 preferably further contains an antioxidant. The antioxidant is preferably contained in an amount of 0.5% by mass to 1.5% by mass, based on the total mass of the colored layer 14. Examples of the antioxidant include hindered phenols. Examples of the hindered phenols include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and 2,2-thiodiethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]. From the viewpoint of weather resistance, the antioxidant and HALS are preferably added in a ratio of 1:2.

[0028] <Picture layer 15> The pattern layer 15 is provided to impart design features with a pattern, and is formed of inkjet ink with a thickness of 1 μm to 20 μm. Examples of inkjet ink include ultraviolet (UV) curable inks in which monomers, photopolymerization initiators, sensitizers, etc. are mixed with prepolymers, and evaporation-drying inks in which colorants and binders are mixed and dispersed or dissolved in a liquid medium.

[0029] Examples of evaporation-drying inks include aqueous inks and latex inks, which have a water-based liquid medium, and oil-based inks, which have an oil-based liquid medium. Among such inkjet inks, UV-curable inks are highly preferred because, when irradiated with UV light, the photopolymerization initiator absorbs UV light of a specific wavelength, causing a chain reaction that instantly cures the ink.

[0030] The pattern layer 15 is formed by multi-drop inkjet printing, and the pattern has a resolution of 600 dpi or more and 1200 dpi or less, and is composed of small dots, which are first dots with a first size and a diameter in the range of 1 μm or more and less than 5 μm, medium dots, which are second dots with a second size and a diameter in the range of 5 μm or more and less than 10 μm, and large dots, which are third dots with a third size and a diameter in the range of 10 μm or more and less than 15 μm.

[0031] As shown in Figure 2, multi-drop inkjet printing ejects ink drops D11-D13, D23, D32, and D33 at high speed from nozzles N1-N3 of an inkjet head while adjusting the number of drops per unit time. As a result, the ink drops D11-D13, D23, D32, and D33 unite in the air and then adhere to the print substrate P, forming a pattern of large dots D10, medium dots D30, and small dots D20 with different diameters on the print substrate P. As a result, the pattern layer 15 has a high-resolution pattern with better gradation expression in the intermediate density range than the single-drop method.

[0032] <Surface protective layer 16> The surface protective layer 16 is provided to impart weather resistance, scratch resistance, bendability, cleanability, etc., and preferably has a thickness of 6 μm or more and 12 μm or less. The surface protective layer 16 preferably contains a main component made of a resin material such as a polyester resin or an acrylic resin, and secondary components such as weather resistance additives, including an ultraviolet absorber (UVA), a light stabilizer (HALS), and an antioxidant.

[0033] For example, it is preferable to use two types of hydroxyphenyltriazine-based UVAs with different maximum absorption wavelengths in combination, as this will produce a synergistic effect and provide higher weather resistance. For example, it is preferable to use a first ultraviolet absorber with a maximum absorption wavelength of 330 nm or more and 340 nm or less and a second ultraviolet absorber with a maximum absorption wavelength of 315 nm or more and 325 nm or less as the two types of hydroxyphenyltriazine-based UVAs.

[0034] In order to balance performance and cost, the first ultraviolet absorber and the second ultraviolet absorber are preferably contained in a range of 2.0 mass % or more and 5.0 mass % or less, and more preferably in a range of 1.0 mass % or more and 3.0 mass % or less, relative to the total mass of the surface protection layer 16.

[0035] Examples of HALS include N-OR type hindered amines. Examples of hindered amines include decanedioic acid bis(2,2,6,6-tetramethyl-1-(octyloxy)-4-piperidinyl)ester and 2,4-bis[N-butyl-N-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidin-4-yl)amino]-6-(2-hydroxyethylamine)-1,3,5-triazine. The HALS content in the surface protective layer 16 is preferably 1.0% by mass or more and 3.0% by mass or less, based on the total mass of the surface protective layer 16.

[0036] Examples of the antioxidant include hindered phenols. Examples of the hindered phenols include pentaerythritol tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate] and 2,2-thiodiethylenebis[3-(3,5-di-t-butyl-4-hydroxyphenyl)propionate]. The antioxidant is preferably contained in an amount of 1.0% by mass to 3.0% by mass relative to the total mass of the surface protective layer 16. From the viewpoint of weather resistance, the antioxidant and HALS are preferably added in a ratio of 1:2.

[0037] <Back surface coating layer 17> The back surface coating layer 17 is provided to protect the back surface of the substrate 11 (chemical conversion coating layer 12) from corrosion and the like, and has a thickness of 2 μm to 8 μm. Examples of materials for the back surface coating layer 17 include known resin coating materials such as those mentioned above in the description of the underlayer 13. The back surface coating layer 17 may also contain an anti-rust pigment to further improve corrosion resistance.

[0038] <Method for manufacturing decorative metal sheet 10> A method for manufacturing such a decorative metal sheet 10 according to this embodiment will now be described.

[0039] First, a steel sheet is plated to form a metal coating on both surfaces to obtain a substrate 11 (substrate forming step), and then a chemical conversion treatment such as a non-chromate treatment is performed on the substrate 11 to form chemical conversion coating layers 12 on both surfaces of the substrate 11 (chemical conversion coating layer forming step). Next, a base resin paint is applied to the chemical conversion coating layer 12 on the front surface of the substrate 11 and dried and cured to provide a base layer 13 (base layer forming step), and then a coloring resin paint is applied to the surface of the base layer 13 and dried and cured to provide a colored layer 14 (colored layer forming step).

[0040] Then, a pattern is formed on the surface of the colored layer 14 using inkjet ink by multi-drop inkjet printing, and the pattern is dried and cured to provide a pattern layer 15 (pattern layer forming step).

[0041] Next, a surface protective resin paint is applied to the surface of the pattern layer 15 and dried and cured to form a surface protective layer 16 (surface protective layer forming step), and a coating resin paint is applied to the chemical conversion coating layer 12 on the back side of the substrate 11 and dried and cured to form a back coating layer 17 (back coating layer forming step). In this way, the decorative metal plate 10 according to this embodiment can be obtained.

[0042] <Action and effect> In the decorative metal sheet 10 according to the present embodiment manufactured in this manner, the pattern of the pattern layer 15 has a resolution of 600 dpi to 1200 dpi and is composed of small dots with diameters ranging from 1 μm to less than 5 μm, medium dots with diameters ranging from 5 μm to less than 10 μm, and large dots with diameters ranging from 10 μm to less than 15 μm. This allows for the pattern layer 15 to have a high-definition pattern with excellent gradation expression in the intermediate density range.

[0043] Therefore, according to the decorative metal plate 10 and the manufacturing method thereof according to this embodiment, the pattern of the pattern layer 15 can be made highly precise, and therefore the design can be further improved.

[0044] [Other embodiments] In the above-described embodiment, the decorative metal sheet 10 employs a substrate 11 having a metal coating formed on both sides thereof, but the present invention is not limited to this. As another embodiment, for example, a decorative metal sheet employing a substrate without a metal coating can also be used. However, as in the above-described embodiment, a substrate 11 having a metal coating formed on both sides thereof is preferable because it can improve adhesion and corrosion resistance to the substrate 11.

[0045] In the above-described embodiment, the decorative metal sheet 10 is described as having the substrate 11, the chemical conversion coating layer 12, the underlayer 13, the colored layer 14, the design layer 15, the surface protective layer 16, and the back surface coating layer 17. However, the present invention is not limited to this. In another embodiment, for example, depending on the performance of the inkjet ink, it is possible to omit the chemical conversion coating layer 12, the underlayer 13, the colored layer 14, the surface protective layer 16, and the back surface coating layer 17, and produce a decorative metal sheet consisting only of the substrate and the design layer.

[0046] However, as in the above-described embodiment, the provision of the chemical coating layer 12 and the back surface coating layer 17 improves the corrosion resistance of the substrate 11, the provision of the undercoat layer 13 improves adhesion to the substrate 11, the provision of the colored layer 14 improves the design of the pattern layer 15, and the provision of the surface protective layer 16 improves weather resistance, scratch resistance, etc., so it is preferable to provide the above-described layers 12 to 14, 16, and 17 as needed.

[0047] In the above-described embodiment, the decorative metal sheet 10 is described as having the base layer 13 and the colored layer 14 provided separately, but the present invention is not limited to this. As another embodiment, for example, it is also possible to provide a decorative metal sheet as a single layer that combines the functions of the base layer and the colored layer.

[0048] In the above-described embodiment, the decorative metal sheet 10 is provided with a pattern layer 15 in which a pattern is formed by three types of dots with different diameters, small, medium, and large, but the present invention is not limited to this. As another embodiment, for example, a decorative metal sheet can be provided with a pattern layer in which a pattern is formed by two types of dots, small, medium, and large.

[0049] In other words, the decorative metal plate is one in which the pattern of the pattern layer has at least a first dot having a diameter of a first size and a second dot having a second diameter different from the first size, and it is preferable that it further has a third dot having a third diameter different from the first size and the second size.

[0050] In other words, when the first size is any one of the ranges of 1 μm or more and less than 5 μm, 5 μm or more and less than 10 μm, or 10 μm or more and less than 15 μm, it is preferable that the second size is any one of the ranges excluding the first size, and further that the third size is any one of the ranges excluding the first size and the second size. [Example]

[0051] Examples of the decorative metal sheet and the manufacturing method thereof according to the present invention will be specifically described below, but the present invention is not limited to the specific examples described below.

[0052] [Preparation of test specimens and comparison specimens] <Test specimen 1> First, a steel sheet was plated to form a metal coating on both surfaces to obtain a substrate. This substrate was then subjected to a non-chromate chemical conversion treatment to form a chemical conversion coating layer on both surfaces of the substrate. Next, a base resin paint was applied to the chemical conversion coating layer on the front surface of the substrate, dried and cured to form a base layer, and then a coloring resin paint was applied to the surface of the base layer, dried and cured to form a coloring layer.

[0053] Then, a pattern was formed on the surface of the colored layer using inkjet ink by multidrop (MD) inkjet (IJ) printing, and dried and cured to provide a pattern layer under the following conditions.

[0054] "Picture Layer" Ink type: UV curing Thickness: 2~20μm Resolution: 1200dpi Dot diameter: small dot 3μm, medium dot 7μm, large dot 13μm Supported gradations: Small dots 0% to 33%, medium dots 33% to 66%, large dots 66% to 100%, 0% is no dots

[0055] Next, a surface protective resin paint was applied to the surface of the pattern layer and dried and cured to form a surface protective layer, and a coating resin paint was applied to the chemical conversion coating layer on the back side of the substrate and dried and cured to form a back coating layer, thereby producing decorative metal sheet specimen 1.

[0056] <Test specimen 2> Specimen 2 of the decorative metal sheet was produced under the same conditions as specimen 1, except that the gradation corresponding to the density of the pattern in the pattern layer was set to the following conditions.

[0057] "Picture Layer" Supported gradations: Small dots 0% to 20%, medium dots 20% to 80%, large dots 80% to 100%, 0% is no dots

[0058] <Test specimen 3> Specimen 3 of the decorative metal sheet was produced under the same conditions as specimen 1, except that the gradation corresponding to the density of the pattern in the pattern layer was set to the following conditions.

[0059] "Picture Layer" Supported gradations: Small dots 0% to 60%, medium dots 60% to 80%, large dots 80% to 100%, 0% is no dots

[0060] <Test piece 4> Specimen 4 of the decorative metal sheet was produced under the same conditions as specimen 1, except that the gradation corresponding to the density of the pattern in the pattern layer was set to the following conditions.

[0061] "Picture Layer" Supported gradations: Small dots 0% to 20%, medium dots 20% to 40%, large dots 40% to 100%, 0% is no dots

[0062] <Test specimen 5> Specimen 5 of the decorative metal sheet was produced under the same conditions as specimen 1, except that the gradation corresponding to the density of the pattern in the pattern layer was set to the following conditions.

[0063] "Picture Layer" Supported gradations: Small dots 0% to 50%, medium dots 50% to 100%, no large dots, 0% means no dots

[0064] <Test piece 6> Specimen 6 of the decorative metal sheet was produced under the same conditions as specimen 1, except that the gradation corresponding to the density of the pattern in the pattern layer was set to the following conditions.

[0065] "Picture Layer" Supported gradations: Small dots 0% to 50%, no medium dots, large dots 50% to 100%, 0% is no dots

[0066] <Test specimen 7> Specimen 7 of the decorative metal sheet was produced under the same conditions as specimen 1, except that the gradation corresponding to the density of the pattern in the pattern layer was set to the following conditions.

[0067] "Picture Layer" Supported gradations: No small dots, medium dots over 0% and up to 50%, large dots over 50% and up to 100%, 0% means no dots

[0068] <Comparative example 1> Comparative decorative metal plate 1 was produced under the same conditions as test specimen 1, except that the pattern on the pattern layer was formed using inkjet (IJ) printing using the single drop (SD) method (dot diameter 6 μm, compatible with all gradations).

[0069] <Comparative body 2> Comparative decorative metal plate 2 was prepared under the same conditions as test specimen 1, except that a pattern was formed on the surface of the colored layer using oil-based ink by gravure offset (GR) printing, and then dried and hardened to form a pattern layer (1 μm thick).

[0070] [Evaluation method] <Design> Test specimens 1 to 7 and comparative specimens 1 and 2 were placed upright and visually evaluated for design (aesthetics) from a distance of 1 m. The results are shown in Table 1 below. In Table 1, "◎" indicates superior design (aesthetics) to the conventional level, "◯" indicates better design (aesthetics) than the conventional level, "△" indicates improved design (aesthetics) than the conventional level, and "×" indicates the same design (aesthetics) as the conventional level.

[0071] [Evaluation results] The evaluation results of test specimens 1 to 7 and comparative specimens 1 and 2 are shown in Table 1.

[0072] [Table 1]

[0073] As can be seen from Table 1, although comparison body 1, which was printed using inkjet (IJ) printing with the single drop (SD) method, was an improvement over comparison body 2, which was printed using conventional gravure offset (GR) printing, it was unable to achieve a fully satisfactory design (aesthetics).

[0074] In contrast, specimens 5 to 7, which were printed using two types of multi-drop (MD) inkjet (IJ) printing, showed better gradation expression design (aesthetics) than conventional levels, and achieved fully satisfactory results.In particular, specimens 1 to 4, which were printed using three types of multi-drop (MD) inkjet (IJ) printing, showed better gradation expression design (aesthetics) than conventional levels, and achieved very satisfactory results.

[0075] From the above, the effects of the present invention were confirmed. [Industrial Applicability]

[0076] The decorative metal plate and its manufacturing method of the present invention can achieve high-resolution patterns on the pattern layer, further improving design, and can therefore be used to great advantage in various industries, including the construction industry. [Explanation of symbols]

[0077] 10 Decorative metal plate 11 Base material 12 Conversion coating layer 13 Base layer 14 Colored layer 15 Picture layer 16 Surface protective layer 17 Back coating layer

Claims

1. a metal plate-shaped substrate; A pattern layer laminated on the surface side of the substrate to form a pattern; In a decorative metal plate comprising: The pattern layer is The image resolution is between 600 dpi and 1200 dpi, a first dot having a diameter of a first size; a second dot having a second diameter different from the first diameter; have A decorative metal sheet characterized by:

2. The pattern layer is and a third dot having a third diameter different from the first size and the second size. The decorative metal sheet according to claim 1 .

3. the first size is any one of a range of 1 μm or more and less than 5 μm, a range of 5 μm or more and less than 10 μm, and a range of 10 μm or more and less than 15 μm; The second magnitude is any one of the ranges excluding the first magnitude. The decorative metal sheet according to claim 1 .

4. the first size is any one of a range of 1 μm or more and less than 5 μm, a range of 5 μm or more and less than 10 μm, and a range of 10 μm or more and less than 15 μm; the second magnitude is any one of the ranges excluding the first magnitude, The third magnitude is one of the remaining ranges excluding the first magnitude and the second magnitude. The decorative metal sheet according to claim 2 .

5. A colored layer is laminated between the substrate and the pattern layer. The decorative metal sheet according to claim 1 .

6. A base layer is laminated between the substrate and the colored layer. The decorative metal sheet according to claim 5 .

7. A transparent surface protection layer is laminated on the surface side of the design layer to protect the surface. The decorative metal sheet according to claim 1 .

8. A back surface coating layer is provided on the back surface side of the substrate to cover the back surface. The decorative metal sheet according to claim 1 .

9. The substrate has a chemical conversion coating layer on the front and back surfaces thereof. The decorative metal sheet according to claim 1 .

10. The substrate is a steel plate having a metal coating formed on the front and back surfaces. The decorative metal sheet according to claim 1 .

11. A method for manufacturing a decorative metal sheet according to any one of claims 1 to 10, The image layer is formed by multi-drop inkjet printing. A method for manufacturing a decorative metal sheet, comprising:

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