What kind of paper should digital printer use?
Improper paper selection will not only change the appearance and quality of the final printed product, but also cause stickiness and blocking problems in digital printing, which will reduce the printing efficiency and waste precious time and money.
Electrostatic Digital Printing Paper Requirements
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1 proper electrical properties
A digital printer, copier, or desktop printer that utilizes electrostatic printing principles is a printing method that utilizes electrostatic attraction of positive and negative charges to transfer ink powder, and therefore requires the electrical properties of the paper, such as resistivity, and dielectric properties. The electrical constants, etc., should be controlled at an appropriate level, and well-conductive paper such as aluminum foil liners can even cause arcing (non-conductive parts or accidental charging of air), resulting in machine damage and poor print quality.
2 Uniformity and surface smoothness
The quality level of prints printed using the principle of electrostatic printing has high requirements on the uniformity of the printed paper: the distribution of fibers or fillers in the paper must be uniform, and the smoothness of the paper surface is also crucial to the quality of the transfer of the color materials. . After the color material reaches the paper, it is mostly fixed by hot pressing. Therefore, the smoothness of the surface of the paper, surface chemical properties and heat treatment performance must also be at a suitable level. Papers containing waxes, stearates, and plasticizers can cause blemishes on the digital press photoreceptors, causing problems.
3 paper temperature and humidity
The change of water content caused by environmental temperature and humidity during the transportation, handling and storage of printed paper has a great influence on the digital printing quality of the electrostatic printing principle. Therefore, relevant warehouses, printing plants, etc. should use air-conditioners to control the temperature of the paper. humidity.
Paper requirements for inkjet digital printing
Digital printing using inkjet technology is very different from digital printing using electrostatic principles. Because ink jets are 50 to 90% solvent-based, pigments are mostly pigmented solid polymer particles. The liquid properties of inks used in ink-jet technology have requirements for the surface absorption and absorption of paper, including: after the ink droplets are sprayed on the paper, the pigment should remain on the paper, and does not spread, which requires the control of the solvent The speed and amount absorbed, and the controlled solvent eventually evaporates from the paper, creating a uniform and consistent print. Therefore, inkjet digital printers have high requirements for surface properties, pore structure, chemical composition, and mechanical properties of paper, and are not the same for all inkjet printers or inkjet materials.