Digital Printing Requirements for Paper Properties

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 in electrophotography

Electrophotographic technology is a frequently used replication technology in scaling digital printing, copying, and desktop printing. To ensure the accurate and normal implementation of this technology, paper is required to maintain the stability of the paper in both plane and three-dimensional aspects when the temperature and humidity changes. , and a lower 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 .

Second, the liquid properties of inkjet ink put forward higher requirements for paper

Inkjet technology and ink jet ink itself are very different from electrophotographic technology. The main component of the ink is solvent, which can reach 50%-90%, while the electrophotographic ink consists of dry polymer particles. 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.