With the accelerated pace of digital printing, digital printing cTP and other new technologies are in full swing. It has become an irreversible mainstream development technology for printing today. The printability of digital printing is also significantly different from traditional printing. For printing equipment printing materials, printing technology has put forward new requirements. In order to achieve good print quality and high speed production. The research and development of digital printing materials, especially digital printing inks, is even more important. After several years of development, digital printing ink technology has matured. However, the high price of digital printing ink is still a bottleneck restricting the development of digital printing.
Digital printing and imaging principle
To talk about digital printing ink, it is necessary to talk about digital printing presses, because different manufacturers of digital printing press imaging principle is different, the composition of the digital printing ink used in the performance, performance requirements are also different. The imaging principles of the currently used digital ElSiJ devices can be divided into six major categories.
1. Electrophotography
Also known as electrostatic imaging, is the use of laser scanning methods to form an electrostatic latent image on the photoconductor and then the use of charged toner and electrostatic latent charge role, the toner image is transferred to the substrate to complete the printing.
2. Jet imaging
The ink is selectively ejected from the fine nozzle onto the substrate at a certain speed to reproduce the ink image. Inkjet printing is classified into continuous inkjet printing and drop-on-demand inkjet printing. Continuous ink jet system uses pressure to make the ink through the pores to form a continuous flow of ink. The droplets are charged after the high-speed ink flow is turned into fine droplets. The charged droplets can be ejected under the control of the charge plate to the desired position on the surface of the substrate to form a printed graphic. The ink drop offset and the position of the ink dot on the substrate are determined by the amount of charge when the ink droplet leaves the hole.
The difference between on-demand and continuous inkjet is that the pressure acting on the cartridge is not continuous. Instead, it is controlled by an imaged digital signal, and it is ejected with pressure when needed. Drop-on-demand inkjet eliminates the need for ink drop migration, eliminating the need for ink tanks and circulation systems. The structure of the inkjet head is relatively simplified.
3. Electrocondensation imaging
Electro-aggregation imaging is caused by the electrochemical reaction between the electrodes resulting in ink condensation. Fix the image on the surface of the imaging drum. The ink in the blank area where no electrochemical reaction occurs can be scraped off by the scraper, and the image formed by the fixed ink on the surface of the drum can be transferred to the substrate by pressure to complete the printing. The representative model of the electro-condensation digital press is the product of EIcorsy. The resolution is 400dpi.
4. Magnetic recording imaging
Magnetic recording imaging relies on the magnetic material's magnetite to align and form a magnetic latent image under the action of an external magnetic field. The use of magnetic toner and magnetic latent image interaction under magnetic field to complete the development. 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 to form an electrostatic latent image on a light conductor. The latent image is formed by the charge between the charged toner and the electrostatic latent image, and the printing is completed by transferring to the substrate. Different types of development are divided into two kinds of electronic ink development. Resolution 800dpi, represented by HPInd{go. The other is the use of dry toner development, resolution 600dpiXeikon, Xerox, Agfa, CanonKodak, ManRoIand, IBM and other digital presses are using this method.
6. Thermal Imaging
Thermal imaging is based on the physical properties of the material after heating changes in the media imaging. Divided into direct thermal imaging and thermal transfer imaging. Direct thermal imaging uses a specially processed substrate with a special coating that changes color after heating. Thermal transfer imaging ink is applied to the ribbon. The heating of the color film or ribbon is transferred to the printing material and the image quality can reach the photo level.
Digital printing ink
1. Dry powder digital printing ink
Dry powder digital printing ink is a dry powdered ink formed by mixing pigment charge particles and a fusible resin with pigment particles. The negatively charged toner is absorbed by the exposed portion to form an image. The toner image transferred to the paper is heated and the resin in the toner is melted and fixed on the substrate to form an image.
2. Liquid digital printing ink
Liquid digital printing inks are often used for ink jet printing, and the type of ink is related to the structure of the ink jet head. The ink jet head can be divided into two major categories of thermal pressure and piezoelectric type, while the piezoelectric type has two kinds of high precision and low precision. The nozzles of EPS0N belong to the high-precision nozzles Xaar and Spectra nozzles belong to the low-precision nozzles. High-precision nozzles use water-based dyes or pigment inks. The latter uses mostly solvent-based pigment inks.
Different from traditional inks. The curing of the electronic liquid ink on the medium does not depend on the drying time of the ink film. Instead, it encounters a high temperature (130°C) blanket that immediately cures on the blanket. The ink graphic on the blanket is 100% transferred to paper or other media. on the other hand. The basic material of electronic liquid ink is a new type of resin material, its microscopic shape is a polygon. Under pressure, unlike conventional inks, it is not easy to diffuse, but it is cured immediately after the contact with paper or other media to make the printed image more clear. Dots are slightly blurred and diffused.
Electronic liquid inks are classified into aqueous inks and oily (solvent) inks. Water-based inks consist of solvents, colorants, surfactant pH modifiers, driers, and the necessary additions. For hot-press inkjet printing systems, only aqueous inks can be used. Drop-on-demand inks are also generally aqueous based inks. Oily (solvent type) ink consists of colorant solvent, dispersed 3, J~n other modifiers.
3. Solid state digital printing ink
Solid-state digital printing inks are mainly used in ink-jet printing. In the normal state, the ink is heated when it is printed in solid state, and the viscosity is reduced and then ejected onto the surface of the substrate. Solid-state digital printing inks consist of colorants, charge carriers, viscosity control agents, and carriers.
4. Electronic ink
Electronic ink is a special kind of ink used for printing and coating on a special film-based material as a display. The diameter of the electronic ink is encapsulated in nanometer size. There are many positively charged white particles and negatively charged black particles in the microcapsules and are distributed in the transparent liquid within the microcapsules. When the microcapsules are charged positively. Positively charged particles gather toward the viewer. The display is white and it is charged negatively. Negatively charged black particles gather on the observer side. And show black. The position of the particles and the color of the display are controlled by the electric field, and the control electric field is generated by the high resolution display array substrate.
5. UV/EB ink
The so-called UV / EB ink is the use of UV curing or electron beam energy curing ink, uv / EB ink type radiation curing ink in ink jet printing is increasingly widely used. The most important feature of UV inks in digital printing is good stability. The advantage of UV curing only under UV light can effectively avoid jamming of the print head. Extend the actual life of the printhead. But the inadequacies are. Using uv/EB ink printing will result in lower printing speed. For example, restrictions on the ink supply chain and the speed at which a large amount of ink passes through the print head. Currently, Xennla's new XenJetVivide series of CMYK pigmented uV curing inks has been certified by Xaar. This new ink was used on the Omnidot 760 print head. Nowadays, research on digital printing inks is in the ascendant worldwide. Digital printing press manufacturers such as Canon, Hew Iett Packard, EPSONScitex Xeikon, and HP Indigo have researched and developed digital printing inks adapted to their system characteristics according to the characteristics of their own digital printing machines. In addition, the world's other famous ink manufacturers. Companies such as DIC, Sun Chemical, Flint, Sakata InxCorp and others have also begun to engage in the development and production of digital printing inks. It is believed that with the universal use of digital printers, the research and development of digital printing inks will be deepened, and new digital printing inks will continue to emerge.
Reprinted from: Ink Information
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