Digital printing may have become the hottest topic in the printing industry. At the same time, it also caused a lively discussion in the paper industry, "What should the paper industry do for digital printing? What is the paper quality requirement for this new printing?" According to a prediction by Pira in 2001, digital commercial printing There will be substantial growth, especially in booklets and direct mail order. However, there can only be a rough estimate of the size or growth of the digital printing paper market. I only know that the number of digital printing machines on the market is increasing and their production efficiency is expanding, so the amount of paper used is also increasing. As for the calculation of the amount of paper used in digital printing, it is difficult, because many digital printers still use traditional printed paper on their digital printing machines, although most digital printing machines have special performance requirements for paper. But familiar offset printing paper is still widely used.
Regardless of the method of printing, the basic requirements of the printed matter on paper are: weight, thickness, brightness, opacity, smoothness, etc. In these aspects, digital printing is no exception. However, sometimes special digital printers also put forward some specific requirements on paper. For example, digital printing machines, copiers or desktop printing machines that use the principle of electrostatic printing are the most common. For this type of printing equipment, the paper is required to have good dimensional stability, low flexibility and low wrinkling under the environment of temperature and humidity changes. At the same time, it also requires proper abrasion resistance, surface conductivity, sufficient stiffness, and less paper wool or dust during the printing process.
Electrical properties, such as resistivity and dielectric constant, should be controlled at appropriate levels. It must also be borne in mind that the moisture content of the paper has a great influence on the performance of the paper as well as its printing performance.
The consistency of the quality of the printed matter printed by the principle of electrostatic printing depends on grasping the correct machine parameters, but the uniformity of the paper is also important: the distribution of fibers or fillers in the paper must be uniform, and the smoothness of the surface is to the color The advantages and disadvantages of material transfer are also crucial, especially for those models where the paper surface and the color material are in close contact. After the color material reaches the paper surface, it is mostly fixed by hot pressing. Therefore, the smoothness of the paper surface, surface chemical properties and heat treatment performance must also be mastered at an appropriate level. The stiffness of low-gram weight coated paper should be required to prevent it from curling on the heat press roller.
The environmental humidity changes during the transportation, transportation and storage of paper have a great influence on the digital printing quality of the electrostatic printing principle. Therefore, the relevant warehouses, printing workshops, etc. should be controlled by air conditioning.
Digital printing using inkjet technology is very different from digital printing using electrostatic principles. Because 50% to 90% of inkjet is solvent-based, and the vast majority of pigments are pigmented solid polymer particles. The liquid properties of the inks used in inkjet technology have surface absorption and absorption requirements for paper, including: after ink droplets are sprayed on the paper surface, the pigment should remain on the paper surface and do not diffuse, which requires the control of its solvent The speed and amount of absorption, and let the controlled solvent finally evaporate from the paper, forming a uniform and consistent mark. Therefore, inkjet digital printers have high requirements on the surface performance, pore structure, chemical composition and mechanical properties of paper, and not all inkjet printers or inkjet materials are the same.
Paper suitable for inkjet digital printers must also be as wrinkle-free, flex-free, and dimensionally stable as possible, and its surface abrasion resistance and electrostatic effects must also be controlled within an ideal range to ensure good printing performance.
In short, although most of the digital printing presses used are ordinary offset printing papers, for some digital printing machines with special structures or technologies, there are certain requirements for papers under certain specific conditions. . It can be said that so far, no paper can adapt to all digital printing machines, this should be paid attention to.
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