There are two main technologies used in inkjet printers: continuous inkjet technology and random inkjet technology.
1. The continuous inkjet technology is represented by the charge modulation type. The principle of this inkjet printing is to use a piezoelectric drive device to apply a fixed pressure to the ink in the nozzle to make it continuously eject. For recording, the vibration signal of the oscillator is used to excite the jet to generate ink droplets, and the size and spacing of the ink droplets are controlled.
The printing information from the character generator and the analog modulator controls the charge on the control telegram to form charged and uncharged ink drops, and then the deflection electrode changes the flying direction of the ink drops to make the ink drops that need to be printed Fly to the paper to generate character/graphic records.blue film inkjet printer Ink droplets that do not participate in the recording are recovered by the catheter.
For the deflection electrodes, some systems use two pairs of mutually perpendicular deflection electrodes to perform two-dimensional deflection on the ink drop printing position; some systems use multi-dimensional control of the deflection electrodes, that is, multi-dimensional deflection.
2. Random inkjet
Random inkjet technology mainly includes micro piezoelectric and thermal bubble type:
Thermal bubble inkjet technology, the principle of thermal bubble inkjet printing is to pack the ink into a very tiny capillary, 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 steam to condense and contract, thereby stopping the flow of the ink until the next time the steam is generated and an ink droplet is generated.
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 larger extension, and the ink droplet Push out the nozzle; at the moment when the ink droplet 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.
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