Talking about the Performance Requirements of Digital Printing Paper in Printing
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Digital printing may be the most talked about topic in the printing industry recently. It is also a hot topic for paper producers. What role does paper play in digital printing? In the digital printing process, digital printing paper What level of quality must be achieved?
According to Pira's 2001 forecast, digital commercial printing has potential and rapid growth, especially in print 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, a rough estimate can be made of the market demand and demand for digital printed paper.
Since the number of traditional papers used by digital printers in the production of digital printers varies, it is more difficult to accurately estimate the market capacity of digital printing paper. Even though most digital printers have slightly different performance requirements for paper used for printing, the use of ordinary offset paper can indeed increase the digital printing production.
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 respects. . In addition, it has a series of special requirements for paper, which is determined by digital printing itself.
First, the hot spear pressure inherent in electrophotographic technology
Electrophotographic technology is a frequently used replication technique for scaling digital printing, copying, and desktop printing. To ensure accurate and normal implementation of this technology, paper requires dimensional and dimensional stability when temperature and humidity change. , and a lower tendency to curl and lift. These conditions are typical ills that occur during transport, storage, printing, post-press processing, and print storage. At a deeper level, the electrophotographic paper must have sufficient friction, surface conductivity, and sufficient stiffness. In addition, the paper is required to be powder-free during printing and finishing.
The impact of paper on print quality must be carefully considered. The color shift is achieved through the power of the electronics field. Paper sub-electronics often change constantly, which means that the electronic properties of the paper must be adjusted to the correct level. It is important to remember that the moisture content of the paper will greatly affect its electrical properties, which will affect printability.
Similarly, electrophotographic printing can be achieved with the right machine, 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 tone shift more efficient and precise, especially in those mechanical designs where the paper and transfer surface are in closer contact with the press.
The color tone is accumulated on the surface of the paper by heating and compression. In order to obtain sufficient color tone adhesion, the roughness, surface chemistry and thermal properties of the paper must be adjusted to the correct level. Stiffness is a must. Those low-gram coated single-sheet papers will curl when the drum is pressed, especially the paper has a certain degree of stiffness.
As mentioned earlier, printers must keep in mind that in the process of electrophotographic printing, the transportation, processing and storage of paper before and after printing is a very dangerous period. Stable printing shop conditions and storage conditions are very important. .
Second, the liquid properties of inkjet inks put forward higher requirements on paper
Inkjet technology and inkjet inks are very different from electrophotographic technology. The main component of the ink is solvent, the content can reach 50%-90%, and the electrophotographic ink is composed of dried polymer particle pigment. The liquid properties of inkjet inks place higher demands on the surface absorbency and absorption capacity of paper. When inkjet ink is sprayed onto paper, the paper is required to make the color of the ink tightly adhere to the surface of the paper, which can be limited and controlled. The diffusion of ink droplets can control the amount of ink absorbed and absorbed by the paper, absorb the solvent in the ink until the solvent evaporates, and finally form a reflective printing ink film. The surface properties of inkjet printed paper, the structure of the micropores, the chemical composition, and the mechanical stretchability of the paper must be fully optimized to suit each particular inkjet printing technique and ink.
Due to the high liquid content of the inkjet ink, the paper used must be resistant to paper curling, warping, and deformation in planar and stereoscopic conditions due to a large amount of liquid components. In order to enable inkjet printing to be performed accurately and smoothly, the friction and static electricity of the surface of the paper must be controlled within a suitable range.