JPS62115074A - Method of forming image on metal surface - Google Patents

Abstract

PURPOSE:To form a well-defined character of image on the surface of a metal, by applying a print on the surface of a metal having an anodic oxidation coating formed thereon through the ink jet method. CONSTITUTION:A predetermined image or character is formed on the surface of a metal having an anodic oxidation coating with a dye-contg. ink by the ink jet method. Examples of the metal include aluminum, copper, iron, and stainless steel. Aluminum is preferable. The method is applicable to the formation of an image on the surface of cars, electric good, buildings, and other metal articles.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method of forming an image on a metal surface by an inkjet method, and can be applied to forming an image on the surface of metal products such as vehicles, electrical appliances, and buildings.

Conventional technology Inkjet printing has conventionally focused on printing over paper or forming strokes.

There are examples of printing on food containers or cans, but since they mainly use oil-based ink, there are problems with the weight and odor of the ink, the need for a binder, and problems with durability and M.
41? The wear resistance was also not sufficient.

Conventionally, as a method for coloring a metal surface, a method is known in which a dye is adsorbed to contractile sites in micropores on a coating formed by anodic oxidation. In particular, known methods for coloring aluminum include electrolytic coloring, electrolytic coloring, and immersion coloring, and recently it has become possible to develop different color tones by changing the electrolytic coloring process time. However, it was not possible to form characters, images, etc. by considering the color tone locally.

Purpose This invention is an image forming method that enables the formation of characters and images by using an inkjet method when forming an image on a metal surface.

Structure The structure of the present invention is a method of forming an image on a metal surface, in which a predetermined image or character is formed by an inkjet method using an ink containing a dye on the surface of a metal on which a positive + fi oxide film is formed.

As the metal, aluminum, copper, iron, stainless steel, etc. are used, and aluminum is particularly suitable. In other words, aluminum is anodized,
It is particularly suitable for the imaging method of this invention because it has 100 to 300 active micropores on the surface.

The principle of printing on anodized aluminum surfaces using the inkjet method of this invention is the same as the conventional dip coloring method, and is a type of method in which dye is adsorbed into the fine pores on the coating surface. By using a charge control method (Charge Control Method) to make water-based ink containing a dye fly, and making each separated droplet adhere to an anodized aluminum surface, it becomes possible to record image information, making it possible to draw desired characters, images, etc. on the metal surface. It can be expected to have many uses.

Furthermore, by performing inkjet printing using inks of different colors, it is also possible to form color images on the metal surface.

If you leave active points in the fine pores of the ink-formed note, it will easily bleed, so post-processing at high temperature and humidity will seal the pores, prevent stains, and improve alpha resistance. I can do it.

Hereinafter, the present invention will be specifically explained with reference to Examples.

In addition, all ♀ (%) of each component in an example are 1%.

Example 1 Solar oxidation of aluminum 1) Aluminum plate was oxidized at 10% in an acid bath at a temperature of 20°C.
Anodization was performed for 5 minutes at a current density of Δ/dm2.

2) After thoroughly washing with pure water, dry with air at room temperature.

3) Printing was performed on the surface of the oxide film of the aluminum plate using an ink having the following composition using a charge-controlled inkjet 5A machine.

4) 1 & left to dry thoroughly.

5) It was left to stand for 2 hours in a constant temperature and humidity device at a temperature of 90% and a temperature of 90° C. to perform a sealing process.

Ink composition (A> Dye, C11, Direct Black 1541% Ethylene glycol 10% Preservative, anti-mold agent, Pull Top 33 (Daiji Yakuhin Kogyo) 0.3% Water 8
2.7% As a result of printing using the above method, a negative Y bright image (image) was obtained.For comparison, I tried printing using the same ink on an aluminum surface that had not been anodized, but no dyeing occurred. did not occur.

Example 2 An image was formed under the same conditions as in Example 1, except that inks with the following compositions (B), (C), J5, and (D) were used instead of ink (A) with the composition in Example 1. did. However, the device used had three nozzles with different mounting numbers.

Ink composition (B) Dye, C,1, Acid Yellow 33 6% Ethylene glycol 10% Preservative, anti-mold agent, pull top (Narita Pharmaceutical: 1:i!> 0.3% Water 83
．． 1% Ink composition (C) Dye, C11, Acid Red 35 7% Diethylene glycol 5% Preservative, anti-mold agent, Sodium Omazine 0.3% Water 87
．． 7% Ink composition (D) Dye, C01, Acid Blue 83 7% Ethylene glycol 10% Preservative, anti-mold agent, Pull Top 33 (Ni-ro) Yakuhin Kogyo) 0.3% Water 82
．． As a result of a test of more than 7%, compared to printing on paper,
Although the aluminum surface had a golden tint to it, images were obtained that allowed sufficient color differentiation.

Effects As explained above, according to the present invention, clear characters or images can be formed on the surface of scrap metal.

Claims (1)

[Claims] 1. A method for forming an image on a metal surface, the method comprising forming a predetermined image or characters on a metal surface on which an anodic oxide film has been formed by an inkjet method using an ink containing a dye.