The working principle of inkjet printer:
(1), the working principle of continuous inkjet technology (continueinkjetprinter) Under pressure, ink enters the spray gun, and a crystal vibrator is installed in the spray gun. By vibration, ink is ejected to form a fixed interval. Through CPU processing and phase synchronization, some ink dots passing through the charging electrode are charged with different charges, and after several thousand volts of high-voltage magnetic field, they are shifted differently, flying out of the nozzle and landing on the moving product surface. The remaining ink dots are uncharged and will not shift, and are directly injected into the recovery tank for recycling. Working principle diagram of CIJ inkjet printer Under the pressure of the ink supply pump, the ink flows out of the ink tank, and the pressure and viscosity are adjusted through the ink pipeline and enter the spray gun. As the pressure continues, ink is ejected from the nozzle. When the ink passes through the nozzle, due to the action of the piezoelectric crystal, the ink is decomposed into a series of continuous ink drops with equal spacing and the same size. The ejected ink continues to move downward and is charged by the charging electrode, where the ink drops are separated from the ink line. When a certain voltage is applied to the charging electrode, when the ink droplet is separated from the conductive ink line, it will instantly carry a negative charge proportional to the voltage applied to the charging electrode. By changing the voltage frequency of the charging electrode to make it the same as the frequency of ink droplet breakage, each ink droplet can be charged with a predetermined negative charge. Under constant pressure, the ink flow continues to move downward and passes between two deflection plates with positive and negative voltages respectively. Charged ink droplets will deflect when passing through the deflection plate, and the degree of deflection depends on the amount of charge. The uncharged ink drops will not deflect, but fly downward, flow into the recovery pipe, and finally return to the ink box through the recovery pipe. Charged and deflected ink drops fall on the object passing in front of the vertical nozzle at a certain speed and angle. Different identification information can be generated by changing the charge of ink droplets through the processing of computer motherboard.
(There are three kinds of inkjet printers with DOD working principle, namely piezoelectric inkjet technology, pressure valve inkjet technology and thermal foaming inkjet technology (1). Piezoelectric inkjet technology: Piezoelectric inkjet printer is also called high-resolution inkjet printer or high-resolution inkjet printer. On the integrated nozzle, there are 128 or more piezoelectric crystals. Through the processing of CPU, a series of electrical signals are output to each piezoelectric crystal through the driving board, and the piezoelectric crystal is deformed, so that the ink is ejected from the nozzle and falls on the surface of the moving object to form a dot matrix, thus forming characters, numbers or graphics. Then, the piezoelectric crystal returns to its original state, and new ink enters the nozzle due to the surface tension of the ink. Because of the high density of ink dots per square centimeter, high-quality characters, complex signs and barcodes can be printed by piezoelectric technology. Electromagnetic valve inkjet printer (large-character inkjet printer): The nozzle is composed of 7 groups or 16 groups of high-precision intelligent micro valves. In inkjet printing, the characters or graphics to be printed are processed by the computer motherboard, and a series of electrical signals are output to the intelligent micro solenoid valve through the output board. The valve is quickly opened and closed, and the ink is ejected in the form of dots according to the constant internal pressure, and these dots form characters or graphics on the surface of the moving printed object.
(3) Thermal foaming inkjet technology: Thermal foaming inkjet technology (TIJ for short) uses a thin film resistor to heat less than 0.5% of the ink in the inkjet area to form bubbles. This bubble expands at an extremely fast speed (less than 10 microsecond), forcing ink droplets to be ejected from the nozzle. The bubble continues to grow for a few microseconds and then disappears back into the resistor. When the bubble disappears, the ink in the nozzle retracts. Then the surface tension will generate suction, and the suction will attract new ink to replenish the inkjet area. Thermal foaming jet printing technology is composed of such a complete circular technical scheme.
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