WER-PD3204 Flex Banner Printer
Printhead clogging
When machine is out of ink, cause body content lack of color, are usually referred to as the “nozzle blockage”, is the main factor that affects the image quality and yield.
To understand the reasons of nozzle clogging contribute to a better understanding of the machine and improve the quality of images. The principle of printhead have some quite like our daily use of bicycle pump, a pump in the movement core is the soul of shower accessories – piezoelectric crystal, when you find the pump not vent, nothing more than two reasons: gas path blocked or pump fan doesn’t work.
Printhead is much more complex than the pump, so blocking reason is various, roughly the following several ways:
Ink outside the nozzle after the accumulation to a certain extent to block a nozzle: this is the most common way of congestion, because the ink solvent must be dry evaporate into the air to make the picture, so that the ink is a volatile liquid, easy volatile solid precipitation and the air. Spray holes in the fabric painting, always in the peripheral part of residual ink, in this part of the ink dry slowly in the air can make the spray nozzle has shrunk even obstructed aperture, but because it is the outside of the nozzle, it is easy to clean, this is why users need to often clean the cause of the nozzle.
Piezoelectric crystals damage: nozzle must not spray ink, general piezoelectric printhead can be used for about a year, in the print work a lot of factories may shorten life.
Piezoelectric crystal fatigue damage: the phenomenon of nozzle inkjet sometimes, sometimes not spraying ink, especially when large amount of ink jet spray (that is, the dark images) (jams) obviously, this is the best way to change a new nozzle.
Nozzle filter blockage caused by nozzle inside out ink: use long nozzle, especially in the print task not full stop factories often at night, the ink does not flow in the nozzle for a long time, easy adsorption on screen or ink inside the wall, make the ink flow of smaller cross-sectional area can also cause nozzle of the phenomenon of ink.
Ink viscosity is too high or too low, ink viscosity is too high to make the ink liquidity is poor, nozzle jet of water ink per unit time is not enough; Ink viscosity is too low, which is too thin, easy to piezoelectric crystals in the nozzle back to smoke inhaled air, not the ink absorption, to gush out of the air; Both can cause nozzle is out of ink. Deposit of ink environment is very important, therefore, before the use should should put ink in use environment is perfect more than 24 hours, because the ink is highly likely to be placed in the low temperature viscosity, viscosity and high temperature will become very low, this annual difference is very big, once a greater difference between viscosity ink mixing, when using can cause gush out ink.
Drive circuit fault: the power circuit of the electronic components ageing and savings too much dry ink dirt, is likely to affect the voltage of driving nozzle, nozzle is not caused by the ink or ink is not stable.
Categories: part of the ink manufacturers ink due to improper control of the quantity of desiccant, dry fast, easy cause ink in external jams, although you can clean, but cleaning intervals are frequent, once for a long time the nozzle without timely protection of nozzle is not used in spray painted next time that may cause permanent damage to the nozzle.
Frequent replacement ink: replacing ink, in many cases could not protect the nozzle, may also affect nozzle ink-jet state.
Machine using environment and the humidity: general advice for 22-25 degrees temperature, humidity 40% to 70%, high and low temperature affect the ink viscosity, produces the phenomenon of lack of ink and paste head phenomenon, often mistaken for the “nozzle blockage”
Nozzle driving voltage: suitable nozzle voltage can make the nozzle inkjet smoother.