Digital printing is probably the most talked about topic in the printing industry recently. It is also a hot topic that paper producers pay attention to. What role does paper play in digital printing? In the process of digital printing, digital printing paper What level of quality must be achieved?
According to Pira's forecast in 2001, there is potential and rapid growth in digital commercial printing, especially in the printing of brochures and direct mail. By understanding the number of digital presses on the market and the exact amount of paper consumed by these presses, as well as the characteristics of these requirements, you can make a rough estimate of the market demand and the increase in demand for digital printing paper.
Because digital printers use digital printing machines in the production process, the amount of traditional paper used is variable, so it is more difficult to accurately estimate the market capacity of digital printing paper. Even though most digital printing machines have slightly different performance requirements for the paper used for printing, the use of ordinary offset paper can indeed make digital printing production grow steadily.
In all printing methods, the variety and purpose of printing production determine some basic requirements of printing paper, such as: paper weight, thickness, whiteness, opacity and roughness, digital printing is no exception in these aspects . In addition, it also has a series of special requirements for paper, which is determined by the digital printing itself.
1. The inherent hot pressure of electrophotography
Electrophotographic technology is a frequently used replication technology in proportionally scaled digital printing, copying and desktop printing. In order to ensure the accurate and normal implementation of this technology, this requires the paper to maintain flat and three-dimensional stability when the temperature and humidity change , And lower tendency to curl and curl. These situations are typical ills that occur during several stages of transportation, storage, printing, post-press processing, and storage of printed products. At a deeper level, electrophotographic paper must have sufficient friction, surface conductivity, and sufficient stiffness. In addition, it also requires that the paper does not fall off during printing and post-press processing.
The influence of paper on printing quality must be carefully considered. The transfer of color tone is realized by the power of the electronic field. Paper sub-electronics often constantly change, which means that the electronic characteristics of paper must be adjusted to the correct level. It must be kept in mind that the moisture content of the paper will greatly affect its electrical properties and thus the printability, which is very important.
Similarly, electrophotographic printing can be achieved with the correct machine equipment, but it is also affected by the smoothness of the paper. In electrophotographic printing paper, the fiber distribution and filling of the paper are equally important. The smooth surface makes the color transfer more effective and more accurate, especially in those mechanical designs, the paper and the transfer surface are in close contact with the printing press.
The color tone accumulates on the surface of the paper by heating and pressure. In order to obtain sufficient color tone adhesion, the roughness, surface chemical properties and thermal properties of the paper must be adjusted to the correct level. Stiffness is a must. Those low-gram-weight coated sheets will curl when the rollers are pressed together, and the paper requires a certain degree of stiffness.
As mentioned earlier, printers must bear in mind that during the electrophotographic printing process, the transportation, processing, and storage of paper before and after printing is a very dangerous period, and stable print shop conditions and storage conditions are very important. .
2. The liquid characteristics of inkjet inks place higher demands on paper
Inkjet technology and inkjet ink itself are very different from electrophotographic technology. The main component of the ink is a solvent, the content can reach 50% -90%, and the electrophotographic ink is composed of dried polymer particle pigments. The liquid characteristics of inkjet inks impose higher requirements on the surface absorption and absorption capacity of paper. When inkjet inks are sprayed onto paper, the paper is required to make the color of the ink tightly fixed on the surface of the paper, which can be restricted and controlled. The diffusion of ink droplets can control the amount and speed of ink absorption by the paper, and can absorb the solvent in the ink until the solvent evaporates, and finally form a reflective printing ink film. The characteristics of the surface of inkjet printing paper, the structure of micropores, the chemical composition and the mechanical stretchability of the paper must be fully optimized to suit each special inkjet printing technology and ink.
Due to the high content of liquid components in inkjet inks, the paper used must be able to resist paper curling, warping, and the possibility of distortion in the plane and three-dimensional caused by the large number of liquid components. In order for inkjet printing to proceed accurately and smoothly, the friction and static electricity on the surface of the paper must be controlled within an appropriate range.
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