Digital printing refers to the process of directly transferring digital graphic information onto printed materials. As a significant advancement in the field of corrugated carton printing, it has emerged alongside the evolution of computerization and networked printing technologies. Unlike traditional methods, digital printing operates directly from a computer to the final print, eliminating the need for intermediate steps like film or plates. It allows for variable data printing, meaning the content can be changed at any time before printing. Even two consecutive prints can differ in layout, content, size, and material. This flexibility makes on-demand, timely, and customizable printing possible—key advantages that set digital printing apart.
In terms of cost, digital printing machines typically require 40% to 50% less investment compared to traditional offset or flexographic printing. Additionally, they offer shorter production cycles and lower per-unit costs, especially when handling small runs. The ability to customize content on demand gives digital printing a strong competitive edge. Among various types of digital printing, inkjet technology has seen the fastest growth.
In 2003, Angel introduced the CORjet, a digital printer designed for corrugated paper and other materials. One of its key features is the use of digital liquid ink transmission. Thousands of nozzles spray extremely consistent droplets at an impressive speed of 25,000 droplets per nozzle per second. The water-based, environmentally friendly ink used in CORjet provides excellent resistance to wear, water, and UV exposure, making it ideal for long-lasting prints.
While digital printing represents a promising future for on-demand printing, it still faces challenges in terms of speed and format when compared to large-scale industrial packaging. However, as the demand for short-run and customized printing increases, particularly in areas like exhibition displays where corrugated paper is widely used, digital printing is expected to take a leading role in this sector.
An example of digital printing in the carton market is the Menasha Display Group in the U.S., which uses digital printing to produce exhibits. When only 1–500 units are needed, traditional printing becomes inefficient and costly. Digital printing eliminates the need for films, plates, or molds, offering high-quality results at a more reasonable price.
The Sai Angel CORjet digital printing machine is capable of printing directly onto corrugated cardboard, with a maximum format of 63 inches by 102 inches. It supports six-color printing, including the standard four colors (cyan, magenta, yellow, black) plus light blue and light red, allowing for vibrant and detailed output.
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