Relationship between ink viscosity and nozzle

- Jul 10, 2020-

The most direct impact of the increase of ink viscosity is the flow of ink in the pipeline, which leads to ink break.


Why are there frequent plugs? The change of viscosity indirectly affects the surface tension of the ink. The surface tension of the liquid is the attraction of the molecules inside the liquid to the surface molecules of the liquid. When the viscosity increases, the shear force between the molecules increases, which indirectly affects the surface tension of the liquid. When the ink drops leave the ink head, if the tension is too high, the ink drops will not spray out, and there will be ink droplets remaining on the surface of the nozzle, resulting in the phenomenon of non particle plug. The other characteristic of the composite solution is that the solubility of the composite solution is relatively low at low temperature, and some solutes often precipitate.


If the ink appears precipitation phenomenon, the precipitated material will also cause ink sac, ink head blockage. The most direct factor is the temperature, too low temperature also affects the adhesion between the ink and the medium. It is important to improve the stability of the ink in the printing process by increasing the indoor temperature.


The same ink, temperature reduction, viscosity will become larger, viscosity is too large, in high-speed printing when it is easy to appear "broken line". Many inkjet printer users will think that the nozzle is blocked, but once cleaned, it will be normal immediately. Soon, it will repeat itself. Some customers will think that it is the ink quality problem. Secondly, the problem of ink absorption and drying. If the temperature is too low, it is not conducive to the ink absorption of the ink-jet medium coating, and is not conducive to the ink solvent volatilization. It causes the phenomenon of "piling up ink". Therefore, the majority of users try to maintain a suitable temperature when using in cold weather, which is conducive to the normal work of the camera.


Under the influence of temperature, the thickness of ink will change, which is a kind of physical phenomenon, but the change is the form, and its essence will not change.


Ink thickening, viscosity also increases, but it is recommended not to use diluent or inking oil into the ink for blending, change its viscosity. Because when users use these additives, you don't know what the total amount of various auxiliaries the ink can hold, which will affect the performance of the ink and the printing quality.