Random inkjet technology mainly includes two types: micro piezoelectric and thermal bubble:
1. Thermal bubble inkjet technology: Inkjet printers generally use thermal bubble inkjet technology. Through the heating, expansion and compression of ink in a short time, the ink is jetted onto the printing paper to form ink dots, which increases the stability of the ink drop color. Performance, achieving high-speed and high-quality printing. In addition to the size of the ink droplet, the shape and consistency of the ink droplet will have a significant impact on the image quality, and the direction and shape of the ink dot produced by the ink at high temperature are not easy to control, so high-precision ink droplet control is very important. The principle of thermal bubble inkjet printing is to pack the ink into a very tiny capillary tube, and quickly heat the ink to the boiling point through a tiny heating pad. This creates a very tiny vapor bubble, which expands and ejects a drop of ink to the top of the capillary. When the heating is stopped, the ink cools, causing the vapor to condense and contract, thereby stopping the ink flow until the next time the vapor is generated and an ink droplet is generated.
2. Micro piezoelectric technology: The micro piezoelectric technology divides the ink droplet control in the inkjet process into three stages: before the inkjet operation, the piezoelectric element first shrinks slightly under the control of the signal; then, the element generates a comparison The large extension pushes the ink drop out of the nozzle; at the moment when the ink drop is about to fly away from the nozzle, the component will shrink again, and the ink surface will be contracted cleanly from the nozzle. In this way, the liquid level of the ink droplets is precisely controlled, and the ink droplets ejected each time have the perfect shape and the correct flying direction.
The micro piezoelectric inkjet system is equipped with a transducer on the ink-filled nozzle, and the transducer is controlled by the printing signal to control the ejection of the ink. According to the working principle and arrangement structure of the micro piezoelectric inkjet system transducer, it can be divided into several types: piezoelectric tube type, piezoelectric film type, piezoelectric sheet type and so on.
The use of micro-voltage changes to control the ejection of ink dots not only avoids the shortcomings of the thermal bubble inkjet technology, but also enables precise control of the ejection direction and shape of the ink dots. The piezoelectric inkjet print head uses a piezoelectric crystal at the back of the micro ink reservoir. Applying an electric current to the crystal will make it bounce inward. When the current is interrupted, the crystal bounces back to its original position and at the same time ejects a tiny drop of ink through the nozzle. When the current is restored, the crystal is pulled back and extended and enters the ready state for ejecting the next drop of ink.
Compared with the two methods, the thermal bubble print head is prone to chemical changes at high temperatures and is unstable. The directionality and volume of the ink particles are not easy to grasp, and the edges of the printed lines are easy to be uneven, which affects to a certain extent. In order to improve the print quality, they are all its shortcomings. The electric print head technology uses the discharge characteristics of the crystal when it is pressurized to steadily eject ink at room temperature. The ability to control ink drops is strong, and the color dots are reduced a lot, and the ink dots produced do not have a tail, so that the printed image is clearer. It is easy to achieve high-precision print quality up to 1440dpi. There is no need to heat the micro-piezoelectric ink jet, and the ink will not undergo chemical changes due to heat, so the requirements for the ink are greatly reduced. In addition, the piezoelectric print head is fixed in the printer, so only the ink cartridge needs to be replaced. Thermal bubble inkjet printers need to install an inkjet nozzle in each ink cartridge: this will increase the cost of the ink cartridge. But the disadvantage of piezoelectric inkjet printers is that if the piezoelectric print head is damaged or blocked, the entire printer needs to be repaired.
Regardless of whether you use heating or vibration to generate ink droplets, the result is the same: attach tiny ink dots to the paper. The smaller the ink dot, the higher the resolution of the printed image and the better the color effect.
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