Requirements of the hottest digital printer on pap

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The requirements of digital printing machine for paper

digital printing may have become the hottest topic in the printing industry. At the same time, it also caused lively discussion in the paper industry. What should the paper industry do for digital printing? What are the requirements for paper quality for this new printing? According to Pira's prediction for 2001, the printing of digital commerce, which is characterized by small deformation, will increase significantly, especially brochures and direct mail orders. However, we can only have a rough estimate of the size or growth of the digital printing paper market. We only know that the number of digital printing machines on the market is increasing, their production efficiency is expanding, and therefore the amount of paper used is also increasing. As for the calculation of the amount of paper used for digital printing, it is difficult, because many digital printers still use traditional printing paper on their digital printing machines. Although most digital printing machines have some special performance requirements for paper, familiar offset printing paper is still widely used

no matter how printed, the basic requirements of printed matter on paper are nothing more than weight, thickness, brightness, opacity and smoothness. In these aspects, digital printing is no exception. However, sometimes special digital printers also put forward some specific requirements for paper. For example, digital printers, copiers or desktop printers using the principle of electrostatic printing are the most common. For this kind of printing equipment, it is required that the paper has good dimensional stability, low flexibility and low wrinkling under the environment of temperature and humidity changes. At the same time, it is also required to have appropriate wear resistance, surface conductivity, sufficient stiffness, and less paper wool or dust in the printing process

electrical properties, such as resistivity and dielectric constant, should be controlled at an appropriate level. It must also be borne in mind that the moisture content of paper has a great impact on the performance of paper as an indispensable testing equipment for physical property experiments, teaching research, quality control and so on, as well as its printing performance

the consistency of the quality of the printed matter printed by the electrostatic printing principle depends on mastering the correct machine parameters in recent years, but the uniformity of the paper is also very important: the distribution of fibers or fillers in the paper must be uniform, and the smoothness of the surface is also crucial to the quality of the color transfer, especially for those models whose paper surface is in close contact with the color. After the pigment reaches the paper, it is usually fixed by hot pressing. Therefore, the smoothness, surface chemical properties and heat treatment properties of the paper surface must also be at an appropriate level. The stiffness of low gram weight coated paper shall be required to prevent it from being twisted on the hot pressing roller

the change of environmental humidity during the transportation, handling and storage of paper has a great impact on the digital printing quality of electrostatic printing principle. Therefore, air conditioning control is applied to relevant warehouses and printing workshops

digital printing using inkjet technology is very different from digital printing using electrostatic principle. Because 50% - 90% of the inkjet is solvent based, and most of the pigments are solid polymer particles with pigments. The liquid performance of ink used in inkjet technology requires the surface absorption and absorption amount of paper, including: after the ink drops are sprayed on the paper, the pigment should remain on the paper without diffusion, which requires to control the speed and amount of solvent absorption, and let the controlled solvent finally volatilize from the paper to form a uniform impression. Therefore, the ink-jet digital printing machine has high requirements for the surface performance, pore structure, chemical composition and mechanical properties of the paper, and it is not necessary for the industrial energy-saving and comprehensive utilization system to thoroughly implement the spirit of the 109 CPC National Congress. The ink-jet printing machine or ink-jet materials are all the same

the paper suitable for inkjet digital printing machine must also be wrinkle free, inflexible and stable in size as far as possible, and its surface wear resistance and electrostatic effect must be controlled within the ideal range in order to ensure good printing performance

in a word, although most of the paper used in many digital printing machines is ordinary offset printing paper, there are still certain requirements for some digital printing machines with special structures or technologies under certain specific conditions. It can be said that so far, no paper can adapt to all digital printing machines, which should be noted

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