Printing Iron Technology Development (I)

In the second issue of the magazine, Issue 2 of 2004, we received a call from some readers after the “Visual Effect Gaining Order - New Trends in the Development of Metal Containers”, hoping to further understand the means and methods for enhancing visual effects. For this reason, it is not unreasonable to continue the article.
In the above, it was mentioned that new, odd, and special designs, fabrications, and treatments of metal containers are used to make the final product stand out from the crowd and provide novel visual effects. Let's first discuss the processing and production of "color" and "pattern."

It is well-known that the decoration of metal, such as tinplate, is to print the color and pattern onto the surface of the tinplate by a printing technique. Until the end of the 20th century, there were three generations of technology used for tinplate printing. they are, respectively:
The first generation, typographic printing: printing and copying of patterns/texts, lines and patches of color with the help of letterpress printing;
The second generation, photography and printing: To achieve image-level tone printing and copying by using copy of photography as a symbol;
The third generation, color printing: The combination of four color printing photography and electronic color separation technology to achieve full-color image printing and copying.
Traditional metal printing mainly includes lithographic offset printing and roll printing. In the case of tinplate, it is mainly offset by offset glue. Since the tinplate substrate is not absorbent, the oven curing process is used to volatilize the solvent in the ink. Due to the limitations of the traditional printing equipment and process environment, due to factors such as substrate, ink and technology, tinplate printing products have a long history of low color saturation, narrow range of color gamut, poor pattern reproducibility, and easily deformed dots. , precision and color difference control more difficult than other issues. (To be continued)