Principle Classification Of Inkjet Printer

1. Continuous Inkjet Printer
Under the pressure of the ink supply pump, the ink flows from the ink tank through the ink path pipe, adjusts the pressure and viscosity, and enters the spray gun. With the continuous pressure, the ink is ejected from the nozzle. When the ink passes through the nozzle, the pressure transistor breaks into a series of continuous, equally spaced and the same size ink drops. The jet ink continues to move downward and is charged through the charging electrode, and the ink drops are separated from the ink line in the charging electrode. A certain voltage is applied to the charging electrode. When the ink drops are separated from the conductive ink line, they will instantly carry a negative charge in direct proportion to the voltage applied to the charging electrode. By changing the voltage frequency of the charging electrode to make it the same as the breaking frequency of the ink drop, each ink drop can be charged with a predetermined negative charge. Under the continuous pressure, the ink flow continues to move downward, passing through the middle of two deflection plates with positive and negative voltage respectively. The charged ink drop will deflect when passing through the deflection plate. The degree of deflection depends on the amount of charge. The uncharged ink drop will not deflect and will fly downward, It flows into the recovery pipe and finally returns to the ink tank for recycling through the recovery pipe. The charged and deflected ink drops fall to the object passing in front of the vertical nozzle at a certain speed and angle.
2. Drop On Demand
There are three types of inkjet printers with on-demand inkjet technology: piezoelectric inkjet technology, pressure valve inkjet technology, and thermal foaming inkjet technology. The working principle of each type is also different.
1) Piezoelectric ink-jet technology: Piezoelectric ink-jet printer is also called high-resolution ink-jet printer or high-resolution ink-jet printer. On the integrated nozzle, 128 or more piezoelectric crystals are used to control multiple jet holes on the nozzle plate respectively. After processing by the CPU, a series of electrical signals are output to each piezoelectric crystal through the drive plate. The piezoelectric crystal produces deformation, so that the ink is sprayed from the nozzle and falls on the surface of moving objects, Form a dot matrix to form words, numbers or graphics. Then, the piezoelectric crystal returns to its original state, and the new ink enters the nozzle due to the effect of the ink surface tension. Due to the high density of ink dots per square centimeter, piezoelectric technology can be used to print high-quality text, complex logos, barcodes and other information.
2) Solenoid valve type inkjet printer (large character inkjet printer): The inkjet is composed of 7 or 16 groups of high-precision intelligent micro-shaped valves. During inkjet printing, the characters or graphics to be printed are processed by the main board of the computer, and a series of electrical signals are output to the intelligent micro-shaped solenoid valve through the output board. The valve opens and closes quickly. The ink is ejected into ink dots by internal constant pressure, and the ink dots form characters or graphics on the moving surface of the printed object.
3. Thermal Inkjet Technology
For short, TIJ uses a thin film resistor to heat less than 0.5% of the ink in the ink ejection area to form a bubble. This bubble expands at an extremely fast speed (less than 10 microseconds), forcing ink droplets to spray out of the nozzle. The bubble continues to grow for a few microseconds and then disappears back to the resistor. When the bubble disappears, the ink in the nozzle retracts. Then the surface tension will produce suction.