Analysis of Printer Inkjet Technology
An inkjet printer, as its name implies, is a printing device that forms ink or ink by attaching ink droplets to a printing medium by spraying. According to the different inkjet methods, inkjet printers can be divided into continuous and random types. The continuous type is mainly used by early inkjet printers and large format printers, while the current mainstream inkjet printers are all used. Random inkjet technology. From the name, we can see the obvious difference between the two inkjet methods, one is continuous inkjet, and the other is intermittent random inkjet.
1. Continuous inkjet technology
The ink droplets of continuous inkjet printers are continuously ejected. The ink is delivered by a pump or compressed air to a piezoelectric device, which applies a high-frequency oscillating voltage to the ink to make it charged and eject continuous and uniform ink from the nozzle. For drip flow, there is an electric field that changes synchronously with the photoelectric conversion signal of the pattern, and the ejected ink droplets will be selectively charged. When the ink flow passes through a high-voltage electric field, the ejection trajectory of the charged ink droplets will be in the electric field Under the action of deflection, hit the surface of the fabric to form a pattern, the uncharged ink droplets are collected and reused by the trap.
The continuous inkjet method can produce high-speed ink droplets, so it has a high printing speed, but compared with the random inkjet technology, the continuous type must have an independent pressure device, and it needs to recover uncharged ink droplets, working efficiency Lower.
2. Random inkjet technology
The random inkjet technology is different from the continuous inkjet method. The system performs jetting only at the position where printing is required. Its structure is simpler, and the cost is lower. The failure rate is also well controlled. At present, the mainstream printer products all use this inkjet technology, which is divided into two types of thermal foaming type and micro piezoelectric type according to the different droplet driving methods.
★ Thermal foaming technology
Thermal foaming technology is an inkjet technology widely used by most printer manufacturers. It first fills the ink into a very tiny capillary tube and quickly heats the ink to a boiling state through an external micro heating pad. At this time, the ink evaporates. A tiny steam bubble is formed, and the volume of the steam bubble rapidly increases, squeezing the ink droplet at the front end thereof to form a jet. The steam bubble stops heating, cools down quickly, and re-condenses into the ink to stay on the top of the capillary, waiting for the ink behind to evaporate and eject it out of the capillary.
This working method of heating, evaporation, spraying, and condensation can spray ink onto the printing medium in a short time, and with the development of optical etching process, the printer using this method can easily achieve high-density nozzle arrangement and printing. Speed ​​is strongly guaranteed. However, because the ink is prone to chemical changes under high temperature environment, and the size, shape, and concentration of the ink droplets are relatively susceptible, it is particularly important to control the ink droplets with high precision. This thermal foaming technology is widely used by Canon, HP, Lexmark and other manufacturers.
★ Micro Piezo Technology
The micro piezoelectric inkjet technology belongs to the normal temperature and pressure printing technology. It places many tiny piezoelectric ceramics near the nozzle of the print head. The piezoelectric ceramics have the characteristics of bending deformation under the effect of voltage changes at both ends. When the image information voltage is added When it is applied to the piezoelectric ceramic, the stretching vibration of the piezoelectric ceramic will change with the change of the image information voltage, and the ink in the ink head will eject the ink uniformly and accurately under the steady state of normal temperature and pressure.
Piezoelectric inkjet technology has stronger control of ink droplets, and the shape of ink droplet particles is more regular, positioning is more accurate, printing resolution is improved, and it is easy to achieve high-precision printing. There is no need to heat the micro piezoelectric inkjet, and the ink will not undergo chemical changes due to heat, which reduces the requirements for ink and extends the life of the print head. Currently, only Epson is using this micro piezoelectric inkjet technology among several major printer manufacturers.
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