With the acceleration of printing digitization, new technologies such as digital printing cTP are in full swing. Has become the irreversible mainstream development technology of today's printing. The printability of digital printing is also significantly different from traditional printing. New requirements are placed on printing materials and printing technology for printing equipment. In order to achieve good printing quality and high-speed production. The research and development of digital printing materials, especially digital printing inks, are even more important. After several years of development, digital printing ink technology has matured. However, the high price of digital printing ink is still the bottleneck restricting the development of digital printing.
Digital printing imaging principle
To talk about digital printing inks, we must talk about digital printing machines, because the imaging principles of digital printing machines introduced by different manufacturers are different, and the requirements for the composition and performance of the digital printing inks used are also different. The imaging principles of digital ElSiJ devices currently in use can be divided into six categories.
1. Electronic photography
Also known as electrostatic imaging, it uses a laser scanning method to form an electrostatic latent image on a photoconductor, and then uses the charge action of the charged toner and the electrostatic latent image to transfer the toner image to the substrate to complete the printing.
2. Jet imaging
The ink is selectively ejected from the fine nozzles onto the substrate at a certain speed to achieve the reproduction of the ink image. Inkjet printing is divided into continuous inkjet printing and drop-on-demand inkjet printing. Continuous inkjet system uses pressure to make ink flow through fine holes to form continuous ink flow. At high speeds, the ink stream turns into tiny droplets and then charges the droplets. The charged ink droplets can be ejected to the desired position on the surface of the substrate under the control of the charge plate to form printed graphics. The offset of the ink droplet and the position of the ink dot on the substrate are determined by the amount of charge when the ink droplet leaves the pore.
The difference between on-demand inkjet and continuous inkjet is that the pressure on the ink cartridge is not continuous. Instead, it is controlled by the imaging digital signal, and it is ejected only when pressure is needed. On-demand inkjet can save the ink tank and circulation system because of no ink droplet offset, and the structure of the inkjet head is relatively simplified.
3. Electrocoagulation imaging
Electro-condensation imaging is caused by the electrochemical reaction between electrodes that causes ink to condense. And fixed on the surface of the imaging drum to form an image. The ink in the blank area where no electrochemical reaction occurs remains liquid and can be scraped off by the scraper, and the image formed by the fixed ink on the surface of the cylinder can be transferred to the substrate by pressure to complete the printing. The representative model of electro-coagulation digital printing machine is the product of EIcorsy. The resolution is 400dpi.
4. Magnetic recording imaging
Magnetic recording imaging is based on the formation of magnetic latent images by aligning magnetrons of magnetic materials under the action of an external magnetic field. Then the magnetic toner and the magnetic latent image are interacted under the magnetic field force to complete the development. Transfer the magnetic toner 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 the laser scanning method to form an electrostatic latent image on the photoconductor. The latent image is formed by the charge action between the charged toner and the electrostatic latent image, and transferred to the substrate to complete the printing. It is divided into two types according to the development method, which is electronic ink development. The resolution is 800dpi, represented by HPInd {go. The other is to use dry toner development, the resolution is 600dpi Xeikon, Xerox, Agfa, Canon Kodak, ManRoIand and IBM digital printers use this method.
6. Thermal Imaging
Thermal imaging is the imaging of the medium by the change of physical properties after the material is heated. Divided into direct thermal imaging and thermal transfer imaging.
Direct thermal imaging is the use of specially processed substrates with special coatings, which change color after heating. Thermal transfer imaging ink is applied to the ribbon. The color film or ribbon is transferred to the printing material by heating, and the image quality can reach photo grade.
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