If you stop and clean the printhead during the printing process, a wide range of colors will appear lighter when you continue printing. This is particularly noticeable when spraying solid (two-color). All users who use the XAAL128 nozzle to arrange the equipment up and down should be more or less encountered.
What is the reason for this? First of all, we first analyze the structure of the equipment. Obviously, this situation mostly occurs on devices with four colors arranged one above the other and with a relatively small amount of ink jet. The ink is a volatile liquid. If the ink dries faster, and the cleaning time is relatively long, plus some penetrating parts have very strong permeation, the ink that is sprayed first is already dry, and the ink after the ink is very difficult to spray. To merge with it, discoloration in this case is naturally happening.
The reason is found, what methods can be used to solve it? In this case, the older inkjet companies have also happened from time to time. The method they usually use is to inspect the state of the nozzles before spraying each frame, clean them when necessary, and try to avoid cleaning the nozzles during the printing process; and if necessary, if necessary. When cleaning the nozzle during the printing process, it should be as fast as possible, or several nozzles should be separately cleaned to avoid color aberration. However, in the actual operation, there are still some chromatic aberrations and discolorations. There is another method that can be used to maintain the indoor high humidity. Although this method is effective, it cannot be implemented in the relatively dry climate (spring) and the region (northwest).
There seems to be no solution to the problem, but I mentioned earlier that 'in the case of faster ink drying' the above phenomenon will occur due to the long pause time. For this problem, the ink manufacturer can completely solve, that is to think of ways to slow down the ink evaporation rate is the ink drying time becomes longer, but experience tells us that if the drying speed is slow, there will be sticky paint and picture stitching when the ink layer The phenomenon of glue sticking, and this situation can be added to the ink to increase the adhesion of the auxiliaries, but the ink production costs will also increase.
In short, inkjet companies always want to be able to use cheap and easy to use ink, and as ink manufacturers are also trying every means to improve their product quality while minimizing their own costs; can be said that as long as there is competition in this kind of place Contradiction will exist, and this just promotes the development of the industry.