How to solve the problem of clogged UV printer nozzle

Why does the machine's nozzle get clogged? When painting, the nozzle of the machine does not produce ink, resulting in a lack of color in the picture content. This is often called "nozzle clogging", which is a major factor affecting picture quality and yield. Of course, "congestion" has various causes:

The piezoelectric crystal is damaged: it is certain that the nozzle cannot eject ink. Generally, a piezoelectric nozzle can be used for about a year, but it is normal that it may not be used for a year in factories with heavy printing workloads.

Blocking the nozzle outside after the ink has accumulated to a certain extent: This is the most common blocking method, because the solvent in the ink must evaporate into the air to dry the picture, so the ink is a volatile liquid that volatilizes in the air, causing the solid object to become Be clear. When the nozzle sprays cloth, there will always be some ink left around it. After this part of ink dries in the air, it will slowly make the nozzle smaller or even clog, but because it is outside the nozzle, it is easy to clean, which is why we often clean the nozzle.

The filter in the nozzle is clogged, causing the nozzle to not emit ink: If the nozzle is used for a long time, especially in factories where the painting task is not full and the factory often shuts down at night, the ink will not flow in the nozzle for a long time and will be easily adsorbed on the inner filter or the ink channel wall. , which reduces the cross-sectional area of ink flow and also causes the nozzle to not emit ink. Now, special equipment can help you solve this problem with your nozzles.

Piezoelectric crystal fatigue damage: The phenomenon is that the nozzle sometimes produces ink and sometimes fails to produce ink. Especially when the amount of ink produced is large (that is, when printing dark pictures), the "clogging" phenomenon is obvious. The best way at this time is to replace the nozzle with a new one.

Drive circuit failure: Aging of the electronic components of the drive circuit and excessive accumulation of dry ink dirt may affect the voltage of the drive nozzle, causing the nozzle to not produce ink or the ink discharge to be unstable.

The viscosity of the ink is too high or too low: the viscosity of the ink is too high, which makes the ink fluidity poor, and the amount of ink ejected from the nozzle per unit time is not enough; the viscosity of the ink is too low, that is, it is too thin, so the piezoelectric crystal in the nozzle is easy to suck when it is pulled back Air cannot absorb ink, so air is ejected; both will cause the nozzle to be empty of ink.

Type of ink: Some manufacturers' inks dry too quickly due to improper control of the amount of desiccant and are easily blocked outside. Although they can be cleaned, cleaning intervals are frequent. Once the nozzle is not used for a long time and is not protected in time, the nozzle may be permanently damaged the next time you spray paint.

Working environment temperature and humidity: Generally recommended temperature is 22~25 degrees and humidity is 40~70%. The temperature will affect the viscosity of the ink, causing the nozzle to be short of ink or slurry, which is often mistaken for "nozzle clogging".

Frequent ink changes: In many cases, the nozzles may not be well protected when changing inks, which will also affect the inkjet status of the nozzles.

If the printing time is too long, the ink is used improperly, or it is not used for a long time, it is easy to cause the nozzle to clog the nozzle hole. Of course, using low-quality ink can also cause nozzles to become clogged, affecting print quality. In severe cases, the entire nozzle may even be scrapped. Although the manufacturing process of the nozzle is exquisite, its structure is not complicated. There are many tiny round holes on the flat surface that is in direct contact with the print media. The nozzle hole is connected to the nozzle inserted into the ink cartridge. Toner or impurities with strong adhesion often remain from the nozzle to the nozzle hole and around the nozzle hole. As long as these toners and impurities are removed, the nozzle can resume normal printing function.