Explain From The Different Principles Why Ink Cannot Be Used Interchangeably Between Large Character Inkjet Printers And Small Character Inkjet Printers?

The working principle of a small character inkjet printer: A small character inkjet printer, also known as a continuous inkjet printer, operates on the principle that ink enters the spray gun under pressure. The spray gun is equipped with a crystal oscillator, which vibrates to form fixed intervals after the ink is sprayed. Through CPU processing and phase tracking, different charges are charged to some ink points at the charging electrode. Under a high voltage magnetic field of several thousand volts, different deviations occur, and the nozzle flies out and lands on the surface of the moving product, forming a dot matrix, thus forming text, numbers, or graphics. The HK8300 and ECJET1000 of Chengdu Linservice Industry are small character inkjet printers that use matching ink. More specifically, the ink flows from the ink tank through the ink pipeline, adjusts the pressure and viscosity, and enters the spray gun. As the pressure continues, the ink is sprayed out of the nozzle. As the ink passes through the nozzle, the pressure of the transistor breaks into a series of continuous, equally spaced, and of the same size ink droplets. The jet ink continues to move downward and is charged through the charging electrode, where the ink droplets separate from the ink line. A certain voltage is applied to the charging electrode, and when the ink droplet separates 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 be the same as the frequency of the ink droplet breaking, each ink droplet can be charged with a predetermined negative charge. Under continuous pressure, the ink stream continues to move downwards, passing through two deflection plates with positive and negative voltage, respectively. Charged ink droplets will deflect when passing through the deflection plate, and the degree of deflection depends on the amount of charge carried. ​Non-charged ink droplets do not deflect and fly downwards. It flows into the recycling pipeline and finally returns to the ink tank for recycling through the recycling pipeline. The charged and deflected ink droplets fall at a certain speed and angle onto the object passing in front of the vertical nozzle. The information to be printed can be processed by the computer motherboard to change the charge carried by the ink droplets and generate different identification information. Therefore, the working principle of small character inkjet printers is more complex and precise than that of large character inkjet printers.

The principle of a large character inkjet printer: Piezoelectric crystals deform, causing ink to spray out of the nozzle and fall on the surface of moving objects, forming a dot matrix, thus forming text, numbers, or graphics. Then, the piezoelectric crystal returns to its original state, and due to the surface tension of the ink, new ink enters the nozzle. Due to the high density of ink dots per square centimeter, piezoelectric technology can be applied to spray print high-quality text, complex logos, barcodes, and other information. The LS716 of Chengdu Linshi Industry is a representative model of large character inkjet printer, also known as electromagnetic valve inkjet printer (large character inkjet printer): The nozzle is composed of 7 or 16 sets of high-precision intelligent micro valves. During 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, which quickly opens and closes, Ink relies on constant internal pressure to form ink dots, which form characters or graphics on the surface of the moving printed object. Therefore, large character inkjet printers do not have high requirements for ink, which is commonly referred to as the opening and closing of the nozzle to allow pressurized ink to shoot out.

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