According to InfoTrends prediction, by 2015, color high-speed inkjet printing will occupy 40% of the color digital printing market, becoming the fastest-growing technology field in the printing industry. The quality and cost advantages brought about by technological advancement are only part of the reason for the rapid growth of color high-speed inkjet printing. The matching degree of printing applications and equipment performance will be the key factor for color high-speed inkjet printers to meet order requirements and ensure the growth of corporate profits, and then win the market. At Drupa 2012, several printing equipment suppliers have researched or cooperated to launch high-speed inkjet printers. The printing format is getting larger and larger, the quality is getting higher and the cost is getting lower, so that high-speed inkjet printing is affected by the industry. The whole is highly valued!
According to the principle of inkjet, inkjet printing can be divided into two types: continuous inkjet and on-demand inkjet.
1. Continuous jet CIJ (Continuous lnk Jet)
The principle of continuous jetting is to apply a high-frequency oscillating pressure to the ink, so that the ink is ejected from the nozzle to form a uniform and continuous stream of droplets. An electric field that changes synchronously with the pattern photoelectric conversion signal is provided at the nozzle. The ejected droplets are selectively charged in the charging electric field. When the flow of droplets continues to pass through the deflection electric field, the charged droplets are deflected under the action of the electric field, and the uncharged droplets continue to fly in a straight line. The droplets flying in a straight line cannot reach the substrate and are recovered by the liquid collector. The charged droplets are ejected onto the substrate to complete the printing.
2. On-demand jet DOD (Drop On Demand)
The working principle of the on-demand jet printing system is that when printing is required, the system applies high-frequency mechanical force and electromagnetic thermal shock to the ink in the nozzle to form tiny droplets and eject them from the nozzle. Set the pattern. The most widely used on-demand jet is thermal inkjet technology, which relies on thermal pulsation to generate ink droplets, and a computer controls a heating resistance wire to a specified temperature, causing ink gas (fog) to be ejected from the nozzle after being atomized. Another type of DOD technology is a voltage-type ejection system, that is, a computer controls to impose a potential on the conductive material to cause the conductive material to compress in the direction of the electric field and expand in the vertical direction to eject the ink. Inkjet printing not only requires high-precision nozzle technology and high-precision control technology, but also requires high-purity, high-density, high-fastness, high-stability ink (ink) to match it before it has use value.
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