Talk about digital printing ink again

Talk about digital printing ink

release date: Source: China paper industry

with the acceleration of the pace of digital printing, new technologies such as Digital Printing CTP are in full swing, and have become the irreversible mainstream development technology of printing today. The printability of digital printing is also obviously different from that of traditional printing. New requirements are put forward for printing equipment, printing materials and printing technology. In order to achieve good printing quality and high-speed production, the research and development of digital printing materials, especially digital printing inks, is more important. After several years of development, digital printing ink technology has become increasingly mature, but the high price of digital printing ink is still the bottleneck restricting the development of digital printing. Today, China's paper industry starts with digital ink packaging and printing. Let's introduce the relevant contents in detail

imaging principle of digital printing

to talk about digital printing ink, we must talk about digital printing machine, because the imaging principle of digital printing machine launched by different manufacturers is different, and the requirements for the composition, performance and properties of digital printing ink used in FL lower limit frequency (Hz) are also different. The imaging principles of digital ElSiJ devices currently used can be divided into six categories

1. Electronic photography

also known as electrostatic imaging, is to use laser scanning method to form electrostatic latent image on the photoconductor, and then use the charge of charged toner and electrostatic latent image to transfer the toner image to the substrate to complete printing

2. Jet imaging

ink is selectively sprayed from the micro nozzle to the substrate at a certain speed to realize ink image reproduction. Inkjet printing is divided into continuous inkjet printing and on-demand inkjet printing. The continuous ink jet system uses pressure to make the ink pass through the pores to form a continuous ink flow. After the ink flow turns into small droplets at high speed, the droplets are charged. The charged droplets can be sprayed to the required position on the surface of the substrate under the control of the charge plate to form a printed image. The displacement of ink droplets and the position of ink dots on the substrate are determined by the amount of charge when the ink droplets leave the pores

the difference between on-demand inkjet and continuous inkjet is that the pressure acting on the storage cartridge is not continuous. It is controlled by the imaging digital signal, and there is pressure to spray when necessary. On demand inkjet because there is no ink drop offset, the ink tank and circulation system can be omitted, and the structure of the inkjet head is relatively simplified

3. Electrocoagulation imaging

electrocoagulation imaging is to condense the ink through the electrochemical reaction between the electrodes, and fix it on the surface of the imaging drum to form an image. The ink in the blank area without electrochemical reaction remains liquid and can be scraped off by the scraper, while the pictures and texts formed by the fixed ink on the surface of the drum can be transferred to the substrate through pressure to complete printing. The representative model of electrocoagulation digital printer is the product of eicorsy company, with a resolution of 400DPI

4. Magnetic recording imaging

magnetic recording imaging relies on the directional arrangement of magnetic particles of magnetic materials under the action of external magnetic field to form a magnetic latent image. Then, the development is completed by the interaction between magnetic toner and magnetic latent image under the force of magnetic field. The magnetic toner is transferred to the substrate to form an image. This method is generally only used for black-and-white printing

5. Electrostatic imaging

electrostatic imaging is the most widely used digital printing imaging technology. It uses laser scanning method to become one of the fastest-growing materials today. As the main raw material of Taicheng polyurethane material, 1 isocyanate forms an electrostatic latent image on the photoconductor. It uses the charge interaction between charged toner and electrostatic latent image to form a latent image, which is transferred to the substrate to complete printing. There are two kinds of development methods. One is electronic ink development, with a resolution of 800dpi, With hpind {go is the representative. The other is dry toner development with a resolution of 600dpixeikon. Digital printing presses such as Xerox, Agfa, canonkodak, manroiand and IBM all use this method from the government level.

6. Thermal imaging

thermal imaging is based on the change of physical properties of materials after heating. It is divided into direct thermal imaging and thermal transfer imaging. Direct thermal imaging is the use of specially processed substrate with special coating The color of the coating changes after heating. The ink of heat transfer imaging is coated on the ribbon. The color film or ribbon is transferred to the substrate by heating, and the imaging quality can reach photo level

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