What kind of paper should I use for a digital press?
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Improper selection of paper not only changes the appearance and quality of the final print, but also causes stickiness and blockage problems in digital printing, which reduces printing efficiency and wastes valuable time and money.
Electrostatic digital printing paper requirements
1 appropriate electrical performance
A digital printing machine, copier, or desktop printer that uses the principle of electrostatic printing is a printing method that uses positive and negative electrostatic attraction to transfer ink powder. Therefore, electrical properties of paper, such as resistivity and dielectric properties, are required. The electric constants and the like should be controlled at an appropriate level, and a conductive paper such as an aluminum foil backing paper may even cause an arc phenomenon (a phenomenon in which a non-conductive portion or an air is accidentally charged), resulting in damage of the machine and poor print quality.
2 uniformity and surface smoothness
The quality level of printed matter printed by the principle of electrostatic printing requires high uniformity of printed paper: the distribution of fibers or fillers in the paper must be uniform, and the smoothness of the surface of the paper is also critical to the transfer of color materials. . After the toner reaches the paper surface, it is mostly fixed by hot pressing. Therefore, the smoothness of the surface of the paper, the surface chemical properties and the heat treatment properties must also be at an appropriate level. In addition, paper containing waxes, stearates, and plasticizers can cause stains on the digital printer's photoreceptors, causing problems.
3 paper temperature and humidity
The change of water content caused by ambient temperature and humidity during the transportation, handling and storage of printing paper has a great influence on the digital printing quality of the electrostatic printing principle. Therefore, the relevant warehouse, printing workshop, etc. should use air conditioner to control the temperature of the paper. humidity.
Inkjet digital printing paper requirements
Digital printing using inkjet technology is quite different from digital printing using electrostatic principles. Because inkjet 50%~90% is solvent-based, and most of the pigments are pigmented solid polymer particles. The liquid properties of the ink used in inkjet technology have surface absorption and absorption requirements for paper, including: after the ink droplets are sprayed on the paper surface, the pigment should remain on the paper surface and not diffuse, which requires controlling the solvent. The rate and amount of absorption, and the controlled solvent eventually evaporates from the paper, forming a uniform print. Therefore, inkjet digital printers have high requirements on the surface properties, pore structure, chemical composition and mechanical properties of paper, and are not uniform for all inkjet printers or inkjet materials.