Why can not achieve the traditional printing offset printing effect, as long as the working principle of ordinary digital printing press and traditional offset printing press to find the problem. The fundamental point is that the traditional printing press penetrates the paper media through the electronic ink, and the digital printing press mostly melts the toner on the paper media through high temperature fixing.
Digital presses that rival offset printing are currently dominated by Océ digital presses and HP indigo. The reason why these two digital printing machines can be distinguished from other brand machines in the printing effect is that the most important thing is the application of electronic ink technology. The following describes the two electronic ink technologies:
1. Occident Printing Technology 2. HP Indigo electronic ink technology, namely HP ElectroInk
What is HP Indigo electronic ink technology HP Indigo electronic ink technology, HP ElectroInk, is a unique liquid ink (liquid EP) that combines the advantages of digital printing with the quality of liquid inks. HP ElectroInk is a charged pigment-based particle that is suspended in a liquid. Similar to other digital printing technologies, namely dry EP (or xerography), HP ElectroInk electronically controls the position of printed particles for digital printing. However, unlike dry EP, the HP ElectroInk particle size is very small, only 1 to 2 microns. HP ElectroInk is supplied to customers in concentrated form and is loaded into the printer in "pollution free" cans. Inside the device, it is thoroughly mixed and diluted with the image oil in an ink tank to form a mixture of image oil and ink particles for printing.
The imaging principle of HP Indigo electronic ink technology firstly charges the imaging board uniformly, and then the laser head discharges the laser beam on the imaging board according to the dot matrix format of the color after the RIP (the potential of the imaging board becomes zero). The color electronic ink will be attached to the imaging area of ​​the imaging plate to form an image layer under the action of the electric field force. The image layer is also transferred to the blanket by the potential difference between the imaging drum and the blanket cylinder. After the electronic ink is warmed on the blanket, it is partially dissolved, transferred by pressure to the substrate, and then cured and attached to the substrate. The imaging process is the same for other colors and is implemented on a set of rollers (color conversion technology).
How HP Indigo Electronic Ink Technology Supports the Performance of High-Quality, Color Digital Printing The particle size in liquid containers provides high image resolution, uniform gloss, sharp edges, and a thin layer that is tightly integrated with the paper so it can be perfect effect.
With the rapid development of digital printing, many brand manufacturers are also aware of the popularity of digital printing equipment applications. In particular, digital presses produced by Océ, Canon, Hewlett-Packard, and Xerox are highly valued by industry insiders. However, due to the two key factors of "digital printing cost" and "printing effect", digital printing presses have restricted their widespread use in printing plants. The cost of digital printing and the effect of digital printing are contradictory in many types of digital printers, and it is difficult to have both. This is the ultimate goal that brand manufacturers have to constantly improve.