JPH0469231B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing decorative sheets for decorated paintings, certificates, cards, and the like.

[Conventional technology]

Ordinary paintings, certificates of commendation, cards, etc. are made by applying predetermined patterns, figures, characters, etc. (hereinafter collectively referred to as patterns) on sheets of paper or synthetic resin. Therefore, they cannot withstand long-term use, and for example, in the case of portable cards, they may have creases or
Easy to damage.

Therefore, in order to improve durability, metal sheets with decorations applied are used in some cases. For example, Japanese Utility Model Application No. 61-71478 introduces a business card in which a pattern is written by a recess formed on the surface of a thin metal plate, and the recess is painted. The pattern formed in this way is
Easy to peel off from metal surfaces. Also, when cleaning a dirty surface with an oil-based detergent, part of the paint film dissolves, causing the pattern to bleed. Therefore, Utsukai Showa 61-71478
In the publication, a transparent resin layer is formed on the entire surface of a thin metal plate after a coating film has been formed to protect the coating film.

[Problem to be solved by the invention]

However, by coating the entire surface with a transparent resin layer, the impression created by the metal background is diluted, resulting in a low commercial value. If coating with a transparent resin layer is omitted to emphasize this impression, the pattern becomes unclear due to elution of the coating film as described above. In addition, not only the luster and texture characteristic of metal surfaces are lost due to the coating, but
The color of the paint film may also fade.

Furthermore, if a strong force is applied to the business card introduced in Japanese Utility Model Publication No. 61-71478 when it is carried in a pocket of clothing, etc., it will buckle and deform. and,
When a deformed business card is returned to its original state, the surface becomes wavy and the product value is significantly reduced. In addition, large-sized decorative sheets manufactured using this method can be handled with a large area, so
The work involved in mounting it on a predetermined wall surface and transporting it becomes extremely troublesome.

Therefore, in the present invention, a pattern is applied by coloring that takes advantage of the luster and texture unique to stainless steel.
To manufacture a decorative sheet which has a good shape, is not easily buckled or deformed, can be rolled up, and has excellent durability through a simple process.

[Means to solve the problem]

In order to achieve the purpose of the decorative sheet manufacturing method of the present invention, a cold rolled stainless steel foil is tensioned and annealed to give it spring elasticity, cut into a predetermined size, and a predetermined shape is applied to the surface of the stainless steel foil. The method is characterized in that a resist pattern having a pattern is formed, an oxide film is formed and colored in an acid bath on a metal surface not covered with the resist pattern, and the resist pattern is removed.

Furthermore, prior to the formation of the oxide film, the metal surface not covered with the resist pattern can be made into a matte finish by etching. Furthermore, the decorative sheet referred to herein includes various types such as paintings, certificates of commendation, cards, calendars, and business cards.

[Effect]

The stainless steel foil used in this invention is 200μ
It is preferable to have a wall thickness of m or less. Thickness
If it exceeds 200 μm, the stiffness will become too strong and permanent deformation will easily occur when a large force is applied.
There are various types of such thin stainless steel foils, but in the present invention, one that has been subjected to tension imparting annealing after cold rolling to impart spring elasticity is used. In the cold-rolled state, the rolling force during rolling remains in the stainless steel foil as internal strain, reducing the yield strength of that portion. As a result, the flat shape cannot be maintained by itself. Furthermore, the thinner the foil, the more the undulations on the foil surface become.

When this foil is subjected to tension annealing, the internal strain generated during cold rolling is released, and the entire stainless steel foil has a high yield strength and a high spring limit value. Moreover, the waving of the foil surface is eliminated, and the flatness is improved. As a result, a flat foil with strong spring elasticity is obtained.

Tension annealing is performed at a temperature lower than the softening temperature of the material while applying a tension lower than the yield stress of the material. This tension imparting annealing is performed in a non-oxidizing atmosphere such as nitrogen gas, argon gas, hydrogen gas, or ammonia decomposition gas. Further, in order to make the surface of the stainless steel foil even smoother, the annealed foil can be buffed and mirror-finished as required.

From the stainless steel foil that has been imparted with spring elasticity and has improved flatness, a foil having a size of a predetermined decorative sheet or a size from which a plurality of predetermined decorative sheets can be made is cut out. Cutting out can be performed by appropriate means such as shearing. A resist is applied or attached to the entire surface of the cut stainless steel foil to form a resist layer, a predetermined pattern is baked, and the resist layer is removed from the portion to be etched to form a resist pattern.

Next, the stainless steel foil on which the resist pattern has been formed is immersed in a mixed aqueous solution of sulfuric acid and chromic acid. Then, an oxide film is formed on the surface of the stainless steel foil that is not covered with the resist pattern, and is colored in various tones using interference colors depending on the thickness of the oxide film. This color tone adjustment is performed by changing the processing time. As the treatment time increases, the color of the formed oxide film changes from blue to gold.
Red and green alternate. The formed oxide film is a film created by oxidizing the surface of stainless steel, so
Adhesion to the base is sufficient.

Next, electrolysis is performed in a mixed aqueous solution of phosphoric acid and chromic acid using stainless steel as a cathode. Through this treatment, the oxide film becomes a surface that has excellent abrasion resistance and is resistant to scratches and the like. Therefore, by taking advantage of the unique texture of stainless steel, it is possible to obtain a colored surface with excellent wear resistance and various tones.

Furthermore, the surface of stainless steel can be etched prior to forming the oxide film. As a result of this etching, the stainless steel surface not covered with the resist pattern becomes satin-like. The oxide film formed thereon provides a satin-like colored area. On the other hand, the surface on which the resist pattern is formed does not come into contact with the etching solution and maintains its initial surface condition.

Note that the surface of the foil serving as the starting material may be made glossy by photo-volatile annealing, buffing, or the like. When an oxide film is formed on such a glossy surface, the surface of the formed oxide film also becomes glossy.

It is also possible to form a through hole in a portion of the stainless steel foil by etching and use this as part of the pattern. In this case, a resist pattern is also formed on the resist layer on the back side of the stainless steel foil, and the portions to be formed into through holes are etched from both sides. Furthermore, it is also possible to apply ceramic coating to a stainless steel foil that has been annealed under tension, and then form a resist pattern thereon. In this case, depending on the type of ceramic, a decorative sheet having a pattern with a unique color tone can be manufactured.

In addition, if the above-mentioned cutting is carried out in a size that allows for a plurality of prescribed decorative sheets, a pattern is formed by etching the border line of each decorative sheet from both sides, and each decorative sheet is be separated. Furthermore, since the stainless steel foil is annealed under tension to release internal strains, it maintains good flatness even after forming through holes and/or a matte surface by etching.

Since the obtained decorative sheet is endowed with spring elasticity, it is difficult to buckle or deform when being handled or carried, and its flatness is maintained. In addition, large-sized products can be rolled up into rolls, and when used, they return to their original flat shape, making them convenient for handling and transportation. For example, the decorative sheet can be stored in a tube and transported. Moreover, a large-sized decorative sheet can be easily attached to a wall surface by applying a rolled decorative sheet to a part of the wall surface and moving the decorative sheet while unwinding it.

〔Example〕

A cold-rolled SUS304 stainless steel foil with a wall thickness of 100 μm was heated with ammonia decomposition gas (75% H ₂ +25
%N ₂ ) at a temperature of 400°C under tension. This annealing imparted spring elasticity to the stainless steel foil, and the spring limit value was 65 Kgf/mm ² . Also,
A stainless steel foil was obtained that was free from waving, had excellent flatness, was not oxidized during annealing, and had excellent surface gloss.

From this tension annealed stainless steel foil,
A specimen measuring 450 mm in length and 370 mm in width was cut out. A resist was applied to the entire surface of the cut stainless steel foil, exposed to light, and unnecessary portions of the resist were removed to form a resist pattern with a predetermined pattern. Next, the specimen was brought into contact with an etching solution having a composition of 43% ferric chloride and a temperature of 50° C., and the stainless steel surface not covered with the resist pattern was etched into a matte finish.

Then, etched stainless steel foil,
It was immersed in a mixed aqueous solution of sulfuric acid and chromic acid for about 8 minutes. Next, electrolysis was performed in a mixed aqueous solution of phosphoric acid and chromic acid using the stainless steel foil as a cathode. The formed oxide film had a dark blue color and had excellent wear resistance. In addition, if the immersion time in the mixed aqueous solution of sulfuric acid and chromic acid is increased, the color tone will change.
It turned dark gold in about 9 minutes, dark red in about 11 minutes, and dark green in about 14 minutes.

After this treatment, the resist pattern was removed with caustic soda solution to expose the flat stainless steel surface. As a result, a decorative sheet was obtained in which the various dark interference color films formed on the satin-like surface and the flat metallic glossy surface mutually emphasized each other. In addition, the formed interference color film had excellent adhesion to the base stainless steel foil and was highly hard, so it maintained its initial clear color tone over a long period of time without any scratches.

In addition, an interference color film was formed on a stainless steel foil specimen under the same conditions except that no etching was performed. The resulting interference color film was bright in color and had excellent gloss, exhibiting a strong contrast with the color tone of the base stainless steel surface.

〔Effect of the invention〕

As explained above, in the present invention, the surface of the stainless steel foil is colored by forming an oxide film in an acid bath. Since this film is a reaction product between an acid solution and the metal surface, it has much better adhesion than paint films, and is also highly hard, so it retains an excellent pattern over a long period of time. is maintained. Moreover, by adjusting the film thickness, the color tone can be changed over a wide range.
Decorative sheets with surface textures tailored to demand are manufactured in the same process.

Claims (1)

[Claims] 1 Cold rolled stainless steel foil is tensioned and annealed to give it spring elasticity, cut into a predetermined size, and a resist pattern with a predetermined pattern is formed on the surface of the stainless steel foil, A method for producing a decorative sheet, comprising forming an oxide film in an acid bath to color the metal surface not covered with the resist pattern, and removing the resist pattern. 2 Cold-rolled stainless steel foil is tensioned and annealed to give it spring elasticity, cut into a predetermined size, a resist pattern with a predetermined pattern is formed on the surface of the stainless steel foil, and the foil is covered with the resist pattern. 1. A method for producing a decorative sheet, which comprises etching an untreated metal surface to give it a satin finish, then forming an oxide film in an acid bath to color the surface, and removing the resist pattern.