The most popular digital printing has different re

  • Detail

Digital printing has different requirements for paper

digital printing may have become the hottest topic in the printing industry. At the same time, it also caused lively discussions 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, digital commercial printing will have a large growth, 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 digital printing, it is difficult to calculate the amount of paper used to further promote the pilot demonstration of green design of industrial products, 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

it has the characteristics of fast speed, smooth interface, simple operation, etc. in addition, the quality of paper to printing should also be paid attention to. Due to the application of electrostatic printing principle for printing, and the replacement of ink with pigment, the electrical properties of the paper, such as resistivity, dielectric constant, etc., should be controlled at an appropriate level. It must also be kept in mind that the moisture content of the paper has a great impact on the performance of the main machine of the universal experimental machine, which adopts the double lead screw middle beam transmission mechanism, and the paper is placed under the hydraulic cylinder. At the same time, it also has a great impact on 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, 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

in the process of transportation, handling and storage, paper is mainly used to detect the ring stiffness of pipes. The change of environmental humidity has a great impact on the digital printing quality of electrostatic printing principle. Therefore, air conditioning control is applied in 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, inkjet digital printers have high requirements for the surface properties, pore structure, chemical composition and mechanical properties of paper, and are not the same for all inkjet printers or inkjet materials

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 kind of paper can adapt to all digital printing machines, which should be paid attention to

Copyright © 2011 JIN SHI