JPS58101091A - Printing method onto aluminum material - Google Patents

Abstract

PURPOSE:To obtain a pattern which is not discolored nor free from color changing by printing a thin film with pattern via ink which contains coloring dyes of different grain sizes, then contacting anodic oxidation film of aluminum material with small particle size colorant in the film and with large particle size colorant remaining on the surface of the film. CONSTITUTION:After a pattern is printed on a thin film with ink which contains colorants of large and small particle sizes, the patter printing surface on the thin film is contacted on the anodic oxidation film of the aluminum material by utilizing hydraulic pressure, thereby impregnating the small particle size colorant of the ink to the ultrafine holes of the film, and remaining with the large particle size colorant on the surface of the film, transferring the pattern onto the aluminum material, isolating and removing the thin film after the transfer, and printing the pattern on the aluminum material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing method for transferring a pattern by closely contacting a thin film with a pattern printed on the surface of an aluminum material.

As a printing method for transferring a pattern using a thin film, 1.
As described in Japanese Patent Publication No. 55-14,755, a pattern is printed on a thin film using an ink containing dissolved dyes or pigments, and this thin film is applied to the surface of an aluminum material on which an anodized film has been formed. A method is known in which the pattern is transferred to an aluminum material by applying pressure to bring the material into close contact and allowing ink to penetrate into the pores of the anodic oxide film, and then the thin film is removed from the aluminum material.

However, with this method, the pattern is formed by penetrating the colorant only into the micropores of the anodic oxide film, so depending on where it is used, there is a risk that the pattern may fade or change color due to ultraviolet rays or wind and rain. There is.

The purpose of the present invention is to solve these problems and provide a printing method for forming a pattern that can withstand outdoor use. A major feature is the use of ink containing

Coloring agents with small particle size include dyes such as Aluminum Ret and Aluminum Yellow, and coloring agents with large particle size include inorganic pigments such as titanium oxide, Orca I Ultramarine, and carbon black, phthalocyanine blue, and Hansa Yellow Nato. organic pigments and other appropriate pigments are used.

Printing ink is prepared by appropriately mixing these colorants, and gravure printing, letterpress printing, etc. can be used as appropriate for printing on the thin film.

Aluminum materials include aluminum plates, aluminum alloy extruded shapes, etc., and all of them must be degreased,
After pretreatment using conventional methods such as etching and smut removal, current waveforms such as direct current, alternating current, AC/DC superposition, etc. An anodic oxide film is generated on the surface by electrolytic treatment using .

The anodic oxide film here is colored during electrolytic treatment,
Also includes those subjected to electrolytic coloring treatment after anodizing treatment.

Hydraulic pressure is used to bring the thin film into close contact with the surface of the aluminum material on which the anodic oxide film has been formed. This refers to the process of making a thin film adhere to the surface of an aluminum material by pressing the aluminum material against the patterned surface and submerging it in a liquid.

According to this method, no matter how complex the cross-sectional shape of the aluminum is, it is possible to adhere the thin film to the entire surface of the aluminum material, and this adhesion allows the ink on the pattern-printed surface to coat the anodic oxide film of the aluminum material. The colorant with a small particle size penetrates into the micropores, and the colorant with a large particle size adsorbs on the surface of the anodic oxide film, completing the transfer of the pattern.

After the transfer, the thin film is removed from the aluminum material by an appropriate removal process using hot water washing, cold water shower, or hot water shower.

In addition, when washing with hot water, it is desirable to seal the anodic oxide film at the same time as removing the thin film.This will ensure that the pattern transferred to the aluminum material surface will be firmly fixed on the aluminum material surface. becomes.

Other sealing means for fixing include pressurized steam treatment, but the most preferred fixing means is sealing the surface of the aluminum material with a resin.

The transfer pattern on the surface of the aluminum material obtained by the method of the present invention as described above consists of a colored layer made of a small-particle colorant that has penetrated into the micropores of the anodic oxide film, and a colored layer that remains in close contact with the surface of the anodic oxide film. It has a double structure formed by a colored layer made of a large particle size colorant.

Therefore, even if the surface colored layer formed by the large particle size coloring agent fades or peels off, the colored layer formed by the small particle size coloring agent in the anodic oxide film will maintain the color of the pattern and extend the transferred pattern. It can be sustained over a period of time,
This has the effect of providing an aluminum material that can withstand outdoor use.

Patent applicant Cubic Engineering Co., Ltd. Sankyo Aluminum Industry Co., Ltd.

Claims (1)

[Claims] A step of printing a pattern on a thin film using ink containing a coloring agent with a small particle size and a coloring agent with a large particle size, and using hydraulic pressure to print a pattern on the pattern-printed surface of the thin film on an aluminum material. The small-particle coloring agent of the ink is allowed to penetrate into the micropores of the anodic oxide film, and the large-particle coloring agent remains in close contact with the surface of the anodic oxide film, thereby creating a pattern. 1. A method for printing on an aluminum material, comprising: a step of transferring the above-mentioned thin film onto an aluminum material; and a step of removing the thin film after the transfer. 2. The method of printing on an aluminum material according to claim 1, wherein the small particle size coloring agent is a dye and the large particle size coloring agent is used as a dye.