The principle of inkjet printing is basically the same whether it is used for inkjet printing in the packaging field or inkjet printing in the office field.
Take the office Inkjet Printer as an example to introduce the principle of inkjet printing. There are two main types of inkjet printers on the market today: Piezoelectric and bubble.
One end of the ink tank of the Piezoelectric Inkjet Printer is a nozzle, and the other end is a piezoelectric material (mostly lead-aluminum-titanium piezoelectric crystals). The ink is pressed out of the nozzle at high speed under the action of the piezoelectric crystal deformation, and the ink droplets After ejection, the Ink Cartridge is promptly filled with ink.
The bubble inkjet printer is equipped with a thermal resistance near the nozzle. The current pulse applied by the digital signal generates heat instantly (heating rate can reach 100 ℃ / s, temperature can reach 280 ℃), and the ink is quickly heated locally to make the surrounding A small amount of ink boils to form a bubble. The ink droplets are ejected out of the nozzle under the action of the high pressure of the bubbles, and at the same time the bubbles disappear and take away the heat. Ink is quickly replenished from the storage chamber through capillary action.
The development of inkjet inks The principle of inkjet printing determines that inkjet inks must have some special properties. First, the ink must have a certain viscosity, surface tension, pH and other physical and chemical properties. Secondly, the ink should also have long-term storage stability, good continuous and intermittent printing performance, good color, brightness, purity and color saturation, water resistance, light resistance, weathering resistance. In addition, the components of the ink cannot react chemically with the nozzle to avoid clogging of the nozzle; the ink should be printed clearly and dry quickly, but it cannot volatilize too fast during the spraying process or when not in use; Neat and clean, without diffusion, lack of ink, unevenness, etc. In order to meet the above performance requirements for inkjet inks, inkjet inks are usually composed of additives such as solvents, colorants, surfactants, humectants, pH adjusters and the like.
