What caused UV print head block ?

1, the ink above the nozzle in the accumulation to a certain extent will block the print head, which is the most common way to block. Because the ink is a volatile liquid, volatile in the air and residual solids. When the ink is sprayed toward the material, a portion of the ink is always left around. This part of the ink in the air after drying slowly make the nozzle smaller or even plug the nozzle. But because it is outside the nozzle, it is easy to clean up, which is why we often clean the print head.


2, the piezoelectric crystal damage: sure that the nozzle can not spray ink, the general piezoelectric nozzle can be used for a year or so, in the inkjet workload of many factories may also use less than a year.

 

3, the piezoelectric crystal fatigue: the phenomenon is sometimes the nozzle inkjet, and sometimes not spray the ink, especially in the large amount of printing (that is, when the dark image) "jam" phenomenon is obvious, the best way to change a new print head.


4, the nozzle inside the filter blockage caused by the nozzle no ink out: the use of a longer time print head, especially in the printing task is not full, machine stops at night, the ink does not flow in the nozzle for a long time, easy to adsorb the filter net or ink tunnel, so that the flow of ink cross-sectional area smaller, will also cause the nozzle no ink out, and now dedicated equipment can help you solve this problem.

 

5, the viscosity of the ink is too high or too low: the viscosity of the ink is too high so that the ink flow is poor, the amount of ink emitted by the nozzle in the unit time is not enough; Ink viscosity is too low, that is too thin, when the piezoelectric crystal pumping easy in the nozzle hole inhale air, can not absorb the ink, which is sprayed out of the air; Both will cause the nozzle no ink out. It is important to ask the customer to keep the ink environment, the ink should be placed in the using environment for more than 24 hours. Because the ink at low temperatures will be placed high viscosity, and high temperature viscosity will become very low. once the viscosity different ink mixed together, it will cause the phenomenon of ink no spray.


6, the drive circuit failure: the drive circuit of the electronic device aging and accumulation of too much dry ink dirt, are likely to affect the drive nozzle voltage, causing the nozzle no ink or ink instability.

7, the type of ink: due to some ink manufacturers improper control of the amount of desiccant, drying too fast, easy to cause the ink in the external blockage, although you can clean, but the cleaning time interval is more frequent. Once a long time do not use the print head and no timely protect it, in the next time printing may cause permanent damage to the nozzle.


8, frequent replacement of ink: in the replacement of ink may not protect the nozzle, will also affect the print head state.


9, the machine using temperature and humidity: the general recommended temperature of 22 to 25 degrees, humidity 40 to 70%,high and low temperature affect the viscosity of the ink, the nozzle will produce the phenomenon of lack of ink, often mistaken for "nozzle block"