On the principle of inkjet printing machine

2022-08-25
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Talking about; The principle of inkjet printer

micro piezoelectric technology divides the ink drop control in the inkjet process into three stages: before the inkjet operation, the piezoelectric element first contracts slightly under the control of the signal; Then, the element produces a large extension to push the ink droplets 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 level will shrink cleanly from the nozzle. In this way, a very tiny steam bubble is born, and the expansion of the steam bubble will eject a drop of ink to the top of the capillary. Nowadays, inkjet printers using this technology are rarely seen. The printing information from the character generator and analog modulator controls the charge on the control telegram to form charged and uncharged ink drops, and then the deflection electrode changes the flight direction of the ink drops, so that the ink drops that need to be printed fly over temperature protection to the paper, generating character/graphic records. In addition, the piezoelectric print head is fixed in the printer, so you only need to replace the ink cartridge. The principle of this ink-jet printing is to use the piezoelectric driving device to exert a fixed pressure on the ink in the nozzle to make it spray continuously. Compared with the continuous type, it has simple structure, low cost and high reliability. However, due to the influence of jet inertia, the jet speed of ink droplets is low. And the efficiency of the working mode is not high enough, and it is not accurate

hot bubble inkjet technology

at present, random inkjet technology mainly includes micro piezoelectric and hot bubble inkjet technology:

in random inkjet system, ink is sprayed only when printing is needed, so it is also called on-demand inkjet technology

in this way, the liquid level of ink drops is accurately controlled, and each ink drop ejected has a perfect shape and accurate flight direction

micro piezoelectric technology

inkjet printers generally use hot bubble inkjet technology. Through the heating, expansion and compression of the ink in a short time, the ink is sprayed onto the printing paper to form ink dots, which increases the color stability of the ink droplets and realizes high-speed and high-quality printing. However, compared with the random type, the structure of this ink-jet printer is more complex: the ink needs a pressure device, and the terminal should have a recovery device to recover the records that are not involved

the micro piezoelectric inkjet system is equipped with a transducer on the nozzle with ink, which is controlled by the printing signal, so as to control the injection of ink. Applying an electric current to the crystal will make it suppress inward. The ability to control ink drops is strong, and the color dots are also reduced a lot. The ink dots produced are not smart except for the relevant investment of the Japanese government, so that the printed image is clearer. Hot bubble inkjet printers need to install inkjet nozzles in each cartridge: this will increase the cost of the cartridge

continuous inkjet technology is represented by charge modulation. Stop heating and cooling the ink, causing the steam to condense and contract, so as to stop the ink activity until the next time steam is generated and an ink drop is born

random inkjet technology

this continuous cycle inkjet system It can generate high-speed ink drops, so the printing speed is high, and ordinary paper can be used. For deflection electrodes, some systems use two pairs of mutually perpendicular deflection electrodes to conduct two-dimensional deflection transformation of the printing position of ink drops; Some systems use multi-dimensional control of the deflection electrode, that is, multi-dimensional deflection transformation. In addition to the size of the ink drop, the consistency of the shape and concentration of the ink drop 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 drop control is very important. When the current is restored, the crystal is pulled back and epitaxially into the preparatory state of spraying the next drop of ink. These two inkjet technologies are very different in principle. Different printing media can obtain high-quality printing results, and it is easy to realize color printing. The principle of hot bubble inkjet printing is to put the ink into a very tiny capillary and quickly heat the ink to the boiling point through a miniature heating pad

compared with these two methods, the color authenticity of the hot bubble print head will be affected to a certain extent because the ink is prone to chemical changes at high temperature and its properties are not disordered; On the other hand, because the ink is ejected through bubbles, the directivity and volume of ink particles are not easy to grasp, and the edges of print lines are easily uneven, which affects the print quality to a certain extent, which are its shortcomings. But the disadvantage of piezoelectric inkjet printer is that if the piezoelectric print head is damaged or blocked, the whole printer needs to be repaired. When the current is interrupted, the crystal bounces back to its original position and shoots a tiny drop of ink through the nozzle. It is easy to achieve high-precision printing quality up to 1440dip, and there is no need to heat when the micro pressure is lack of edge and angle. The ink will not change chemically due to heat, so the requirement for ink is greatly reduced. Micro piezoelectric print head technology uses the characteristics of discharge when the crystal is pressurized to eject ink without disorder at room temperature

continuous inkjet technology

working principle of inkjet printer

inkjet printer can be roughly divided into A4 inkjet printer, A3 inkjet printer and A2 inkjet printer if it is divided only from the printing format; If it is divided from the purpose, it can be divided into ordinary inkjet printer, digital photo printer and portable mobile inkjet printer. Therefore, according to the working principle and arrangement structure of micro piezoelectric inkjet system transducers, they can be divided into several types: piezoelectric tube type, piezoelectric film type, piezoelectric sheet type and so on. The early inkjet printers and the current large format inkjet printers all use continuous inkjet technology, while the current inkjet printers that are popular in the market generally use random inkjet technology

the change of micro voltage is used to control the injection of ink dots, which not only avoids the shortcomings of hot bubble inkjet technology, but also can?? The print head uses a piezoelectric crystal at the rear of the micro ink reservoir. The early inkjet printers and the current large format inkjet printers all use continuous inkjet technology, while the current inkjet printers that are popular in the market generally use random inkjet technology. These two inkjet technologies The so-called inkjet printer is to form words or images by spraying ink droplets onto the printing medium. For recording, the vibration signal of the oscillator is used to excite the jet to generate ink drops, and the size and spacing of ink drops are controlled

the so-called inkjet printer is to form words or images by spraying ink droplets onto the printing medium. In this random inkjet system, in order to make up for this shortcoming, many random inkjet printers adopt the method of multiple nozzles to improve the printing speed. Ink drops not involved in recording are recovered by the catheter

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