1, continuous inkjet technology is represented by charge modulation. The principle of this kind of inkjet printing is to use piezoelectric driving device to fix the pressure on the ink in the nozzle and make it spray continuously. When recording, the vibration signal of the oscillator is used to excite the jet to generate ink drops, and the size and spacing of the ink drops are controlled.
The printing information from the character generator and analog modulator controls the charge on the telegram to form charged and uncharged ink drops, and then deflects the electrode to change the flying direction of the ink drops, so that the ink drops that need to be printed fly to the paper, resulting in character/graphic records. Ink drops that do not participate in recording are recovered by the catheter.
For deflection electrodes, some systems use two pairs of deflection electrodes perpendicular to each other to deflect the printing position of ink drops in two dimensions; Some systems use multidimensional control for deflection electrodes, that is, multidimensional deflection type.
2. Random inkjet
Random inkjet technology mainly includes two categories: micro-piezoelectric type and thermal bubble type:
Thermal bubble inkjet technology, the principle of thermal bubble inkjet printing is to put ink into a very tiny capillary and quickly heat the ink to the boiling point through a tiny heating pad. In this way, a very tiny steam bubble is generated, and the expansion of the steam bubble ejects a drop of ink to the top of the capillary. When the heating is stopped, the ink cools, which leads to the condensation and contraction of steam, thus stopping the ink flow until the steam is generated and ink droplets are generated next time.
Micro-piezoelectric technology divides the ink drop control in the ink-jet process into three stages: before the ink-jet operation, the piezoelectric element first shrinks slightly under the control of the signal; Then, the element produces a greater extension to push the ink droplets out of the nozzle; At the moment when the ink drops are about to fly away from the nozzle, the element will shrink again and the ink level will shrink cleanly from the nozzle. In this way, the liquid level of ink droplets is accurately controlled, and the ink droplets ejected each time have perfect shape and correct flight direction.
The micro-piezoelectric ink-jet system is equipped with a transducer on the nozzle filled with ink, and the transducer is controlled by the printing signal, thus controlling the injection of ink. According to the working principle and arrangement structure of transducers in micro piezoelectric ink-jet system, it can be divided into several types, such as piezoelectric tube type, piezoelectric thin film type and piezoelectric thin film type.
Extended data
Characteristics of inkjet printer equipment
1, the operation is simple and convenient. It saves a lot of traditional craft production, such as film production.
2, the printing speed is fast. Different from traditional printing, saving technology saves a lot of time and has low input cost.
3. Overcome the boundaries of materials. Not picky about materials, like any material, unlimited.
4, meet all kinds of product modeling. Whether it is curved surface, circle, metal or glass, there is no limit.
5, high-precision perfect jet printing. High precision printing, printing accuracy reached 2880dpi.
6. Print format. At present, there are many printing formats, which can meet the personalized printing of Juck sheets in A3(480mm×330mm), A2(420mm×640mm), A1(610x1800mm) and other formats.
Baidu Encyclopedia-General Inkjet Printer
Baidu encyclopedia-inkjet printer