A brief introduction of inkjet printer

Thermal inkjet technology uses a thin film resistor to heat less than 0.5% of the ink in the ink ejection area to form a bubble. The bubble expands at a very fast speed (less than 10 microseconds), forcing ink droplets to eject from the nozzle. The bubbles continue to grow for a few microseconds and then disappear back to the resistor. When the bubbles disappear, the ink of the nozzle retracts. Then the surface tension generates suction, pulling new ink to supplement the ink ejection area. Thermal induction inkjet technology is constructed by such an integrated cycle technology program. In piezoelectric inkjet technology, ink is ejected from a nozzle similar to thermal induction inkjet technology, but it is formed by narrowing the area where the ink is ejected. The size of the ejection area is controlled by applying voltage to one or more piezoelectric plates in the ejection area. Because ink is prone to chemical changes at high temperature, the orientation and size of ink particles are not easy to grasp, and the edges of printing lines are prone to be uneven, which affects the quality of printing to a certain extent, all of which are its shortcomings. Micro-piezoelectric printing head technology utilizes the discharging characteristics of crystal under pressure to eject ink steadily at room temperature. It has a strong ability to control ink droplets, easy to achieve 1440 DPI high-precision printing quality, and micro-piezoelectric inkjet without heating, ink will not be heated and biochemical changes, thus greatly reducing the requirements for ink. Liquid inkjet printers represent the mainstream products in the market.

Inkjet printers need a series of complicated procedures when printing images. When the printer nozzle sweeps through the printing paper quickly, countless nozzles on it will emit countless small ink droplets, thus forming the pixels in the image. On the printer head, there are generally 48 or more independent nozzles which emit various colors of ink. For example, 48 nozzles of Epson Stylus photo 1270 can emit five different colors: blue-green, red-purple, yellow, light blue-green and light red-purple, and 48 nozzles that emit black ink. Generally speaking, the more nozzles, the faster the printing speed. Different colours of ink drop on the same point, forming different duplicate colours. It is easy to understand the printer’s working principle by observing the simple four-color inkjet operation: there are 0 to 4 kinds of ink droplets covering each pixel. As shown in the figure below, different combinations can produce more than 10 different colors. Some printers can also produce 16 different colors by combining colors, such as “blue-green and black” or “red-purple, yellow and black.

The technical support content was provided by v4ink, a compatible toner cartridge seller.

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