In gravure printing ink viscosity variation factors
Release time： 2015/2/3
Special gravure printing ink viscosity and its associated liquidity, good ink viscosity is the key to ensure ink has good transitivity. Although the ink transfer rate and the types of resin, printing pressure, printing substrate, ink adhesion, printing speed, ambient temperature and relative humidity, the depth of the plate mesh point levels, and many other factors have much to do, but the ink viscosity is a decisive factor.
The important factors affecting ink viscosity:
1 the size of the liquid viscosity, fixed resin. Resin viscosity, ink viscosity is high, the opposite of low.
2, temperature. High temperature low, ink viscosity, low conversely.
3, the matching of pigment and resin liquid. If both cohesion reflects, ink system of high viscosity, low conversely.
4, solvent and miscibility and intermiscibility of evacuation. Such as solvent to any body of dilute the evacuation, the ink viscosity is low, the opposite is high.
Special gravure printing ink adhesion through low, may cause printing quality pinhole images, or large area color piece not plain, not smooth, but also can make the printing quality breezing, emerging halo. Printing surface smooth substrates, ink adhesion fastness is low; Printing paper zhang, will emerge pulverization, gray image.