JPH07276895A - Decorative sheet with silver pattern and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a decorative sheet having a noble appearance of a natural silver pattern and a simple method for manufacturing the same. CONSTITUTION:A decorative sheet comprises a silver layer 2 in which its surface is discolored by sulfiding, and a silver pattern 5 formed by partly reducing the discolored layer 3 of the surface. A method for manufacturing the decorative sheet comprises the steps of forming the layer 2 on a sheet base material 1, discoloring the surface of the layer 2 by sulfiding, placing viscous reducing liquid 4 containing reducing agent in a predetermined pattern on the surface of the discolored layer 3, reducing the layer 3 of a position adhered with the liquid 4, and then wiping OFF the liquid 4 to express the pattern 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decorative sheet having a silver natural pattern and a method for producing the decorative sheet.

[0002]

2. Description of the Related Art A sheet made by placing a silver foil on the surface of Japanese paper and subjecting the surface to sulfurization to change its color has been used for folding screens for a long time. It is also known to apply coloring on such a color-changing sheet, but the method is to simply apply a colorant onto the color-changing sheet, and the colored pattern is present in a raised state covering the color-changing surface. It wasn't natural. There is also a method in which the silver surface is masked in a predetermined pattern portion in advance, sulfurized, and the mask is removed to leave the silver surface in a pattern shape. The discolored portion is formed, and the silver surface remaining in the pattern is also vivid, resulting in an unnatural appearance with a silver hole in the pattern in the discolored portion.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a decorative sheet having a natural silvery pattern and a noble appearance as a whole, and in particular, it is directly painted with a brush. It is also an object of the present invention to provide a method for producing a decorative sheet that allows a calligraphy to be represented as it is as a natural silvery pattern.

[0004]

The decorative sheet of the present invention comprises:
This is a decorative sheet in which the surface of the silver layer of a sheet base material provided with a silver layer on the surface is discolored by sulfurization treatment, and the discolored layer on the surface is partially reduced to form a silver pattern.

In such a decorative sheet, a silver layer is formed on a sheet base material, the surface of the silver layer is subjected to a sulfurization treatment to change the color, and a viscous reducing solution containing a reducing agent is desired on the surface of the color changing layer. The pattern can be obtained by reducing the color-changing layer at the place where the reducing solution adheres and then wiping off the reducing solution to form a silver pattern.

The sheet base material may be made of paper, cloth, metal, wood, or plastic, and the silver layer formed thereon has a silver foil attached thereto, electroless plating, electrolytic plating, sputtering or the like. May be formed, or may be formed by a transfer method.

Further, the discoloration of the surface of the silver layer may be carried out by any method as long as it causes sulfurization and discoloration of the silver surface. For example, it may be carried out by applying a paper or cloth impregnated with sulfur and then ironing it, and in this method, depending on the amount of sulfur and how to apply heat, gold,
A burnt color-changing layer with a variety of colors such as red, brown, blue, green, and black is formed.

Next, the surface of the color-changing layer thus obtained is
The reducing liquid for partially reducing and forming a desired silver color pattern may include a reducing agent that reduces silver that has been discolored by being sulfurized or oxidized by a sulfurization treatment, but may be handwritten with a brush or a screen. In order to draw a desired pattern on the color-changing layer by a printing method or the like, it is preferable to form it viscous.

As the thickening agent for thickening the reducing solution, for example, polyvinyl alcohol, carboxymethyl cellulose and the like can be used any water-soluble sizing agent which is not affected by the reducing agent.

As the reducing agent, both inorganic and organic reducing agents can be used as long as they can reduce silver that has been discolored by being sulphurized or oxidized, but in order to effectively reduce and remove the discolored layer, the reducing agent is used. It is preferable that the liquid contains an acid such as sulfuric acid, nitric acid or acetic acid.

It is preferable to add a colorant to the reducing solution so that the portion showing the pattern on the color-changing layer can be easily identified. An inert pigment, dye or the like can be used as the colorant, but it is preferable to use India ink when drawing a calligraphy with a brush.

After the reducing liquid is applied to reduce the discoloration layer, the reducing liquid is wiped off with a cloth wet with water. Since the layer may also be removed by reduction, the reducing power of the reducing solution, the action time, etc. may be controlled as necessary.

In the method of the present invention, the reducing solution is applied to the discoloration layer exhibiting a fascinating burning color in which a variety of colors such as gold, brown, red, blue, green and black are mixed by the sulfurating treatment of silver. Apply with a brush etc., reduce the discoloration layer along the application pattern,
Although it forms a silver pattern, the degree of reduction differs depending on the degree of sulfidation or oxidation of the discoloration layer and the degree of adhesion of the reducing liquid.Therefore, the silver pattern is completely silvery and partially brown. The part with a tinged silver color is mixed and formed in a natural state integrated with the discoloration layer.

In addition, it is preferable to provide a protective film of casein, urethane resin or the like on the silver pattern to prevent silver from burning.

[0015]

EXAMPLES The present invention will be described in more detail with reference to examples. Example 1 In this product, as shown in FIG. 1, the letters "ai" are written with a brush using a reducing solution on the discoloration layer 3 in which the silver surface is discolored by sulfurization. The discoloration layer 3 has a variety of color tones such as black, brown, red, gold, blue, and green due to the intensity of sulfurization or oxidation. The discoloration layer 3 is reduced according to the above-mentioned "ai" character. The letter "ai" as written with the brush is shown in silver.

This character, that is, the silver-colored pattern 5, naturally changes in silver color depending on the degree of discoloration of the discoloration layer 3 and the coating amount of the reducing liquid, and is a natural finish integrated with the discoloration layer 3. Has become.

That is, the portion of the color-changing layer 3 where the degree of color change is weak (the portion of gold, blue, green, etc.) and / or the portion where the amount of reducing liquid adheres is a complete silvery pattern A, but the color-changing layer In the part where the degree of discoloration of 3 is strong (the part such as red, brown, and black) and / or the part where the amount of the reducing liquid adheres is small, the reduction is insufficient,
It is a brownish silver pattern B, and a decorative sheet, such as a noble cultural heritage, can be obtained, in which the calligraphy written in silver has a discolored appearance over time.

Such a product is obtained in the process of FIG. For example, a polyurethane oil varnish is applied to the surface of a sheet base material 1 made of Japanese paper to form a resin layer 6, and a silver foil is adhered on the resin layer 6 to form a silver layer 2 (step a). On the surface of the layer 2 is placed a sulfur-deposited cloth, which is then ironed to sulphate the surface of the silver layer 2 to produce a color-changing layer 3 with a variety of different brown colors (step b). On the discoloring layer 3, a black paste-like reducing liquid 4 obtained by adding polyvinyl alcohol and India ink to a reducing agent (containing thiourea and an acid in distilled water) is used to write letters with a brush. It is allowed to stand for a minute to reduce the discoloration layer 3 of the portion of the character represented by the above-mentioned brush (step c), and thereafter, the reducing liquid 4 is applied with a cloth soaked with water.
The silver pattern 5 corresponding to the above characters formed by wiping and reducing is exposed (step d), and then casein is applied to the entire surface to form the protective film 7 (step e).

Example 2 A silver pattern 5 was formed on the surface of a sheet having a color-changing layer 3 obtained in the same manner as in Example 1 by a screen printing method. As the reducing solution, the reducing agent of Example 1 to which carboxymethyl cellulose and India ink were added was used. As in Example 1, the obtained product was a decorative sheet having a natural and delicate silver-colored pattern 5 on the surface of the color-changing layer 3 which was rich in variation and which directly represented a silver-colored pattern.

[0020]

The product of the present invention comprises the color-changing layer 3 which is formed by sulfurating silver and which exhibits various colors excellent in metallic luster.
The silver-colored pattern 5 has a natural appearance integrated with the discoloration layer 3, and is highly useful as a noble upholstery sheet such as a folding screen or colored paper. In the present invention, since the reducing liquid 4 is applied to the discoloring layer 3 in which the surface of the silver layer 1 has been sulfurized and discolored, a desired silvery pattern 5 can be expressed in a natural state. , A calligrapher or the like can directly obtain a work of art in which silver letters are directly expressed with good workability.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a product of the present invention.

FIG. 2 is a process drawing showing an example of the manufacturing method of the present invention.

[Explanation of symbols]

 1 sheet 2 silver layer 3 discoloration layer 4 reducing solution 5 silver pattern 6 resin layer 7 protective film

Claims (5)

[Claims] 1. A decorative sheet in which the surface of a silver layer 2 of a sheet substrate 1 having a silver layer 2 on its surface is discolored by sulfurization treatment, and the discoloring layer 3 on the surface is partially reduced to give a silver pattern. 5. A decorative sheet having a silver pattern, which is characterized by forming 5. 2. A silver layer 2 is formed on a sheet substrate 1, the surface of the silver layer 2 is subjected to a sulfurizing treatment to change color, and a viscous reducing solution 4 containing a reducing agent is added to the surface of the color changing layer 3. In a desired pattern, and after reducing the discoloration layer 3 at the place where the reducing solution 4 is adhered, the reducing solution 4 is wiped off to produce a silver-patterned decorative sheet characterized by exhibiting a silver-colored pattern 5. Method. 3. The method according to claim 2, wherein the oil-based resin layer 6 is formed on the sheet base material 1, and a silver foil is adhered on the oil-based resin layer 6 to form the silver layer 2. 4. The method according to claim 2, wherein the reducing liquid 4 contains a colorant. 5. The method according to claim 2, wherein a protective film 7 is formed so as to cover the silver pattern 5.