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Technology Behind A UV Inkjet Printer
Uv inkjet printer, small, simple and convenient with low printing noise, were developed after dot matrix printers and used a non-impact way of working. It can print pictures comparable to photos. After several years of training, the technology of inkjet printers has made great progress. Imagine that in 1995, a color uv inkjet printer with a price of around 4,000 yuan could only print pictures with very low quality while nowadays a color inkjet printer of more than 1,000 yuan is enough to meet all the needs of ordinary families. Even users like photography enthusiasts who have high requirements for picture quality can still find ideal products with 2,000 to 3,000 yuan.
The technology behind it, however, is not that complex. 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. This bubble expands at an extremely fast speed (less than 10 microseconds), forcing ink droplets to eject from the nozzle. The bubble continues to grow for a few microseconds before it fades back to the resistor. When the bubbles disappear, the ink in the nozzle retracts. The surface tension will then create a suction force that will draw new ink to replenish the ink ejection area. Thermal inkjet technology is structured by such an integrated cycle technology program. In piezoelectric inkjet technology, the ink is ejected from a nozzle similar to the thermal inkjet technology, but the formation method is formed by reducing the area where the ink is ejected. The size of the ejection area is controlled by applying a voltage to one or more piezoelectric plates in the ejection area. Because the ink is prone to chemical changes at high temperatures, the directionality and volume of the ink particles are not easy to grasp, and the edges of the printed lines are easily uneven, which affects the print quality to a certain extent.
The micro-piezo print head technology uses the characteristics of discharge when the crystal is pressurized to stably eject ink at normal temperature. It has the characteristics of strong control of ink droplets, therefore is easy to achieve high-precision print quality of 1440dpi, and the micro-piezo inkjet does not require heating, the ink will not undergo chemical changes due to heat, so the requirements for ink are greatly reduced. Liquid inkjet printers represent the mainstream products in the market.
Uv inkjet printer needs to perform a series of complicated procedures when printing images. When the printer's print head quickly swept over the printing paper, the countless nozzles on it will eject countless small drops of ink, thereby composing the pixels in the image. There are usually 48 or more independent nozzles on the printer head to eject various colors of ink. For example, the 48 nozzles of Epson Stylus photo 1270 can spray 5 different colors: cyan, magenta, yellow, light blue-green, and mauve purple, and another 48 nozzles that spray black ink. In general, the more nozzles, the faster the printing speed. Ink droplets of different colors fall on the same point, forming different multi-colors. It can be observed with a microscope that the yellow and blue-violet inks are sprayed to the same place as green, so we can think that the basic color printed is formed in the inkjet overlay. By observing the simple four-color method we can easily understand the working principle of the uv inkjet printer: 0 to 4 kinds of ink drops are covered on each pixel. Different combinations can produce more than 10 different colors. Some printers can also produce 16 different colors by combining colors, such as "cyan, black" or "red-purple, yellow, and black".
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