Printing paper requirements in India

Editor's note: 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? Digital printing process, digital What kind of quality level must print paper have?
According to Pira's forecast in 2001, there is a potential rapid growth in digital commercial printing, especially in the printing of booklets 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 growth in demand for digitally printed paper.
Since the number of traditional papers used by digital printers in the production process of digital printers varies, it is more difficult to accurately estimate the market capacity of digitally printed papers. Even though the vast majority of digital presses have slightly different performance requirements for printing paper, the use of ordinary offset printing papers can indeed enable digital printing production to grow substantially.
Among all printing methods, the type and purpose of printing production determine some basic requirements for printing paper, such as: paper weight, thickness, whiteness, opacity and roughness, and digital printing is no exception in these respects. . In addition, it also has a series of special requirements for paper, which is determined by the digital printing itself.
I. The inherent hot-spear pressure of electrophotography The electrophotographic technology is a frequently used replication technology in scaling digital printing, copying, and desktop printing. To ensure the precise and correct implementation of this technology, this requires the paper to be Humidity changes maintain the stability of the plane and three-dimensional, and the lower the tendency to curl and tilt. These conditions are typical of the shortcomings that occur during transportation, storage, printing, post-press processing, and printed product storage. At a deeper level, electrophotographic paper must have sufficient friction, surface conductivity, and sufficient stiffness. In addition, it requires that the paper does not fall off during printing and postpress processing.
The impact of paper on print quality must be carefully considered. Tonal transfer is achieved through the power of the electronics field. Sub-electronics on paper constantly change, which means that the electronic properties of paper must be adjusted to the correct level. It must be borne in mind that it is important that the moisture content of the paper will greatly affect its electrical properties and thereby affect printability.
Similarly, electrophotographic printing can be achieved with the right machinery, but it is also affected by the smoothness of the paper. In electrophotographic printing paper, the fiber distribution and filling of the paper is also important. The smooth surface makes the color shift more efficient and accurate, especially in those mechanical designs where the paper and the transfer surface are in close contact with each other.
Hue accumulates on the surface of the paper by heating and pressure. In order to obtain adequate hue adhesion, the roughness, surface chemistry, and thermal properties of the paper must be adjusted to the correct level. Stiffness is a must-have, those low-gloss coated sheets will curl when the drum is pressed, especially requiring a certain degree of stiffness.
As mentioned before, printers must keep in mind that during the electrophotographic printing process, the transportation, processing, and storage of paper before and after printing is a very dangerous period. It is very important that the stable printing room conditions and storage conditions are .
2. The liquid properties of inkjet inks place higher demands on paper. Inkjet technology and ink jet inks are very different from electrophotographic technology. The main components of inks are solvents, and their content can reach 50%-90. %, while electrophotographic inks consist of dry polymer particle pigments. The liquid properties of inkjet inks place higher demands on the surface absorption and absorption capacity of the paper. When inkjet inks are sprayed onto the paper, the paper is required to make the color of the ink tightly fixed on the surface of the paper and can be limited and controlled. The diffusion of ink droplets can control the amount of ink absorbed by the paper and the speed of absorption, can absorb the solvent in the ink until the solvent volatilizes, and finally forms a reflective printing ink film. The surface properties of ink-jet printing paper, the structure of the micro-holes, the chemical composition, and the mechanical stretchability of the paper must be fully optimized to suit each particular inkjet printing technology and ink.
Due to the high content of liquid components in inkjet inks, the paper used must be able to resist the curling, curling, and deformation of the paper in both plane and three-dimensional directions due to the large amount of liquid. In order for the ink jet printing to be performed accurately and smoothly, the friction and static electricity on the surface of the paper must be controlled within a suitable range.